AC_ARG_WITH(
[linux-headers],
AS_HELP_STRING([--with-linux-headers=dir],[use the linux header files in dir instead of the supplied ones in "src/include"]),
- [AC_SUBST(linuxdir, "$withval")], [AC_SUBST(linuxdir, "../include")]
+ [AC_SUBST(linuxdir, "$withval")], [AC_SUBST(linuxdir, "\${top_srcdir}/src/include")]
)
AC_SUBST(LINUX_HEADERS)
src/charon/plugins/eap_md5/Makefile
src/charon/plugins/eap_gtc/Makefile
src/charon/plugins/eap_sim/Makefile
+ src/charon/plugins/kernel_netlink/Makefile
src/charon/plugins/smp/Makefile
src/charon/plugins/sql/Makefile
src/charon/plugins/medsrv/Makefile
encoding/payloads/unknown_payload.c encoding/payloads/unknown_payload.h \
encoding/payloads/vendor_id_payload.c encoding/payloads/vendor_id_payload.h \
kernel/kernel_interface.c kernel/kernel_interface.h \
+kernel/kernel_interface_ipsec.h kernel/kernel_interface_net.h \
network/packet.c network/packet.h \
network/receiver.c network/receiver.h \
network/sender.c network/sender.h \
SUBDIRS = .
PLUGINS = ${libstrongswan_plugins}
+#if USE_KERNEL_NETLINK
+ SUBDIRS += plugins/kernel_netlink
+ PLUGINS += kernel-netlink
+#endif
+
if USE_STROKE
SUBDIRS += plugins/stroke
PLUGINS += stroke
lib->plugins->load(lib->plugins, IPSEC_PLUGINDIR,
lib->settings->get_str(lib->settings, "charon.load", PLUGINS));
+ /* create the kernel interfaces */
+ this->public.kernel_interface->create_interfaces(this->public.kernel_interface);
+
#ifdef INTEGRITY_TEST
DBG1(DBG_DMN, "integrity test of libstrongswan code");
if (fips_verify_hmac_signature(hmac_key, hmac_signature))
/*
- * Copyright (C) 2006-2008 Tobias Brunner
- * Copyright (C) 2005-2007 Martin Willi
- * Copyright (C) 2006-2007 Fabian Hartmann, Noah Heusser
- * Copyright (C) 2006 Daniel Roethlisberger
- * Copyright (C) 2005 Jan Hutter
+ * Copyright (C) 2008 Tobias Brunner
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* $Id$
*/
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <sys/time.h>
-#include <linux/netlink.h>
-#include <linux/rtnetlink.h>
-#include <linux/xfrm.h>
-#include <linux/udp.h>
-#include <netinet/in.h>
-#include <pthread.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <string.h>
-#include <net/if.h>
-#include <sys/ioctl.h>
-
#include "kernel_interface.h"
+#include <pthread.h>
+
#include <daemon.h>
#include <utils/linked_list.h>
-#include <processing/jobs/delete_child_sa_job.h>
-#include <processing/jobs/rekey_child_sa_job.h>
-#include <processing/jobs/acquire_job.h>
-#include <processing/jobs/callback_job.h>
-#include <processing/jobs/roam_job.h>
-
-/** required for Linux 2.6.26 kernel and later */
-#ifndef XFRM_STATE_AF_UNSPEC
-#define XFRM_STATE_AF_UNSPEC 32
-#endif
-
-/** routing table for routes installed by us */
-#ifndef IPSEC_ROUTING_TABLE
-#define IPSEC_ROUTING_TABLE 100
-#endif
-#ifndef IPSEC_ROUTING_TABLE_PRIO
-#define IPSEC_ROUTING_TABLE_PRIO 100
-#endif
-
-/** default priority of installed policies */
-#define PRIO_LOW 3000
-#define PRIO_HIGH 2000
-
-/** delay before firing roam jobs (ms) */
-#define ROAM_DELAY 100
+#include <utils/mutex.h>
-#define BUFFER_SIZE 1024
+typedef struct private_kernel_interface_t private_kernel_interface_t;
/**
- * returns a pointer to the first rtattr following the nlmsghdr *nlh and the
- * 'usual' netlink data x like 'struct xfrm_usersa_info'
- */
-#define XFRM_RTA(nlh, x) ((struct rtattr*)(NLMSG_DATA(nlh) + NLMSG_ALIGN(sizeof(x))))
-/**
- * returns a pointer to the next rtattr following rta.
- * !!! do not use this to parse messages. use RTA_NEXT and RTA_OK instead !!!
- */
-#define XFRM_RTA_NEXT(rta) ((struct rtattr*)(((char*)(rta)) + RTA_ALIGN((rta)->rta_len)))
-/**
- * returns the total size of attached rta data
- * (after 'usual' netlink data x like 'struct xfrm_usersa_info')
+ * Private data of a kernel_interface_t object.
*/
-#define XFRM_PAYLOAD(nlh, x) NLMSG_PAYLOAD(nlh, sizeof(x))
-
-typedef struct kernel_algorithm_t kernel_algorithm_t;
+struct private_kernel_interface_t {
-/**
- * Mapping from the algorithms defined in IKEv2 to
- * kernel level algorithm names and their key length
- */
-struct kernel_algorithm_t {
/**
- * Identifier specified in IKEv2
+ * Public part of kernel_interface_t object.
*/
- int ikev2_id;
+ kernel_interface_t public;
/**
- * Name of the algorithm, as used as kernel identifier
+ * list of registered ipsec kernel interfaces
*/
- char *name;
+ linked_list_t *ipsec_interfaces;
/**
- * Key length in bits, if fixed size
+ * list of registered network kernel interfaces
*/
- u_int key_size;
-};
-
-ENUM(policy_dir_names, POLICY_IN, POLICY_FWD,
- "in",
- "out",
- "fwd"
-);
-
-#define END_OF_LIST -1
-
-/**
- * Algorithms for encryption
- */
-static kernel_algorithm_t encryption_algs[] = {
-/* {ENCR_DES_IV64, "***", 0}, */
- {ENCR_DES, "des", 64},
- {ENCR_3DES, "des3_ede", 192},
-/* {ENCR_RC5, "***", 0}, */
-/* {ENCR_IDEA, "***", 0}, */
- {ENCR_CAST, "cast128", 0},
- {ENCR_BLOWFISH, "blowfish", 0},
-/* {ENCR_3IDEA, "***", 0}, */
-/* {ENCR_DES_IV32, "***", 0}, */
- {ENCR_NULL, "cipher_null", 0},
- {ENCR_AES_CBC, "aes", 0},
-/* {ENCR_AES_CTR, "***", 0}, */
- {ENCR_AES_CCM_ICV8, "rfc4309(ccm(aes))", 64}, /* key_size = ICV size */
- {ENCR_AES_CCM_ICV12, "rfc4309(ccm(aes))", 96}, /* key_size = ICV size */
- {ENCR_AES_CCM_ICV16, "rfc4309(ccm(aes))", 128}, /* key_size = ICV size */
- {ENCR_AES_GCM_ICV8, "rfc4106(gcm(aes))", 64}, /* key_size = ICV size */
- {ENCR_AES_GCM_ICV12, "rfc4106(gcm(aes))", 96}, /* key_size = ICV size */
- {ENCR_AES_GCM_ICV16, "rfc4106(gcm(aes))", 128}, /* key_size = ICV size */
- {END_OF_LIST, NULL, 0},
-};
-
-/**
- * Algorithms for integrity protection
- */
-static kernel_algorithm_t integrity_algs[] = {
- {AUTH_HMAC_MD5_96, "md5", 128},
- {AUTH_HMAC_SHA1_96, "sha1", 160},
- {AUTH_HMAC_SHA2_256_128, "sha256", 256},
- {AUTH_HMAC_SHA2_384_192, "sha384", 384},
- {AUTH_HMAC_SHA2_512_256, "sha512", 512},
-/* {AUTH_DES_MAC, "***", 0}, */
-/* {AUTH_KPDK_MD5, "***", 0}, */
- {AUTH_AES_XCBC_96, "xcbc(aes)", 128},
- {END_OF_LIST, NULL, 0},
-};
-
-/**
- * Algorithms for IPComp
- */
-static kernel_algorithm_t compression_algs[] = {
-/* {IPCOMP_OUI, "***", 0}, */
- {IPCOMP_DEFLATE, "deflate", 0},
- {IPCOMP_LZS, "lzs", 0},
- {IPCOMP_LZJH, "lzjh", 0},
- {END_OF_LIST, NULL, 0},
+ linked_list_t *net_interfaces;
+
+ /**
+ * ipsec interface
+ */
+ kernel_ipsec_t *ipsec;
+
+ /**
+ * network interface
+ */
+ kernel_net_t *net;
+
+ /**
+ * locking mutex
+ */
+ mutex_t *mutex;
};
/**
- * Look up a kernel algorithm name and its key size
+ * Implementation of kernel_interface_t.get_spi
*/
-static char* lookup_algorithm(kernel_algorithm_t *kernel_algo,
- u_int16_t ikev2_algo, u_int16_t *key_size)
+static status_t get_spi(private_kernel_interface_t *this, host_t *src, host_t *dst,
+ protocol_id_t protocol, u_int32_t reqid, u_int32_t *spi)
{
- while (kernel_algo->ikev2_id != END_OF_LIST)
- {
- if (ikev2_algo == kernel_algo->ikev2_id)
- {
- /* match, evaluate key length */
- if (key_size && *key_size == 0)
- { /* update key size if not set */
- *key_size = kernel_algo->key_size;
- }
- return kernel_algo->name;
- }
- kernel_algo++;
- }
- return NULL;
+ return this->ipsec->get_spi(this->ipsec, src, dst, protocol, reqid, spi);
}
-typedef struct route_entry_t route_entry_t;
-
-/**
- * installed routing entry
- */
-struct route_entry_t {
-
- /** Index of the interface the route is bound to */
- int if_index;
-
- /** Source ip of the route */
- host_t *src_ip;
-
- /** gateway for this route */
- host_t *gateway;
-
- /** Destination net */
- chunk_t dst_net;
-
- /** Destination net prefixlen */
- u_int8_t prefixlen;
-};
-
/**
- * destroy an route_entry_t object
+ * Implementation of kernel_interface_t.get_cpi
*/
-static void route_entry_destroy(route_entry_t *this)
+static status_t get_cpi(private_kernel_interface_t *this, host_t *src, host_t *dst,
+ u_int32_t reqid, u_int16_t *cpi)
{
- this->src_ip->destroy(this->src_ip);
- this->gateway->destroy(this->gateway);
- chunk_free(&this->dst_net);
- free(this);
+ return this->ipsec->get_cpi(this->ipsec, src, dst, reqid, cpi);
}
-typedef struct policy_entry_t policy_entry_t;
-
-/**
- * installed kernel policy.
- */
-struct policy_entry_t {
-
- /** direction of this policy: in, out, forward */
- u_int8_t direction;
-
- /** reqid of the policy */
- u_int32_t reqid;
-
- /** parameters of installed policy */
- struct xfrm_selector sel;
-
- /** associated route installed for this policy */
- route_entry_t *route;
-
- /** by how many CHILD_SA's this policy is used */
- u_int refcount;
-};
-
-typedef struct addr_entry_t addr_entry_t;
-
/**
- * IP address in an inface_entry_t
+ * Implementation of kernel_interface_t.add_sa
*/
-struct addr_entry_t {
-
- /** The ip address */
- host_t *ip;
-
- /** virtual IP managed by us */
- bool virtual;
-
- /** scope of the address */
- u_char scope;
-
- /** Number of times this IP is used, if virtual */
- u_int refcount;
-};
+static status_t add_sa(private_kernel_interface_t *this, host_t *src, host_t *dst,
+ u_int32_t spi, protocol_id_t protocol, u_int32_t reqid,
+ u_int64_t expire_soft, u_int64_t expire_hard,
+ u_int16_t enc_alg, u_int16_t enc_size,
+ u_int16_t int_alg, u_int16_t int_size,
+ prf_plus_t *prf_plus, mode_t mode, u_int16_t ipcomp, bool encap,
+ bool update)
+{
+ return this->ipsec->add_sa(this->ipsec, src, dst, spi, protocol, reqid,
+ expire_soft, expire_hard, enc_alg, enc_size, int_alg, int_size,
+ prf_plus, mode, ipcomp, encap, update);
+}
/**
- * destroy a addr_entry_t object
+ * Implementation of kernel_interface_t.update_sa
*/
-static void addr_entry_destroy(addr_entry_t *this)
+static status_t update_sa(private_kernel_interface_t *this, u_int32_t spi,
+ protocol_id_t protocol, host_t *src, host_t *dst,
+ host_t *new_src, host_t *new_dst, bool encap)
{
- this->ip->destroy(this->ip);
- free(this);
+ return this->ipsec->update_sa(this->ipsec, spi, protocol, src, dst, new_src,
+ new_dst, encap);
}
-typedef struct iface_entry_t iface_entry_t;
-
/**
- * A network interface on this system, containing addr_entry_t's
+ * Implementation of kernel_interface_t.query_sa
*/
-struct iface_entry_t {
-
- /** interface index */
- int ifindex;
-
- /** name of the interface */
- char ifname[IFNAMSIZ];
-
- /** interface flags, as in netdevice(7) SIOCGIFFLAGS */
- u_int flags;
-
- /** list of addresses as host_t */
- linked_list_t *addrs;
-};
+static status_t query_sa(private_kernel_interface_t *this, host_t *dst, u_int32_t spi,
+ protocol_id_t protocol, u_int32_t *use_time)
+{
+ return this->ipsec->query_sa(this->ipsec, dst, spi, protocol, use_time);
+}
/**
- * destroy an interface entry
+ * Implementation of kernel_interface_t.del_sa
*/
-static void iface_entry_destroy(iface_entry_t *this)
+static status_t del_sa(private_kernel_interface_t *this, host_t *dst, u_int32_t spi,
+ protocol_id_t protocol)
{
- this->addrs->destroy_function(this->addrs, (void*)addr_entry_destroy);
- free(this);
+ return this->ipsec->del_sa(this->ipsec, dst, spi, protocol);
}
-typedef struct private_kernel_interface_t private_kernel_interface_t;
-
/**
- * Private variables and functions of kernel_interface class.
+ * Implementation of kernel_interface_t.add_policy
*/
-struct private_kernel_interface_t {
- /**
- * Public part of the kernel_interface_t object.
- */
- kernel_interface_t public;
-
- /**
- * mutex to lock access to netlink socket
- */
- pthread_mutex_t nl_mutex;
-
- /**
- * mutex to lock access to various lists
- */
- pthread_mutex_t mutex;
-
- /**
- * condition variable to signal virtual IP add/removal
- */
- pthread_cond_t cond;
-
- /**
- * List of installed policies (policy_entry_t)
- */
- linked_list_t *policies;
-
- /**
- * Cached list of interfaces and its addresses (iface_entry_t)
- */
- linked_list_t *ifaces;
-
- /**
- * iterator used in hook()
- */
- iterator_t *hiter;
-
- /**
- * job receiving netlink events
- */
- callback_job_t *job;
-
- /**
- * current sequence number for netlink request
- */
- int seq;
-
- /**
- * Netlink xfrm socket (IPsec)
- */
- int socket_xfrm;
-
- /**
- * netlink xfrm socket to receive acquire and expire events
- */
- int socket_xfrm_events;
-
- /**
- * Netlink rt socket (routing)
- */
- int socket_rt;
-
- /**
- * Netlink rt socket to receive address change events
- */
- int socket_rt_events;
-
- /**
- * time of the last roam_job
- */
- struct timeval last_roam;
-
- /**
- * whether to install routes along policies
- */
- bool install_routes;
-
- /**
- * routing table to install routes
- */
- int routing_table;
-
- /**
- * priority of used routing table
- */
- int routing_table_prio;
-
- /**
- * whether to react to RTM_NEWROUTE or RTM_DELROUTE events
- */
- bool process_route;
-
-};
+static status_t add_policy(private_kernel_interface_t *this, host_t *src, host_t *dst,
+ traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
+ policy_dir_t direction, protocol_id_t protocol,
+ u_int32_t reqid, bool high_prio, mode_t mode,
+ u_int16_t ipcomp)
+{
+ return this->ipsec->add_policy(this->ipsec, src, dst, src_ts, dst_ts,
+ direction, protocol, reqid, high_prio, mode, ipcomp);
+}
/**
- * convert a IKEv2 specific protocol identifier to the kernel one
+ * Implementation of kernel_interface_t.query_policy
*/
-static u_int8_t proto_ike2kernel(protocol_id_t proto)
+static status_t query_policy(private_kernel_interface_t *this,
+ traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
+ policy_dir_t direction, u_int32_t *use_time)
{
- switch (proto)
- {
- case PROTO_ESP:
- return IPPROTO_ESP;
- case PROTO_AH:
- return IPPROTO_AH;
- default:
- return proto;
- }
+ return this->ipsec->query_policy(this->ipsec, src_ts, dst_ts, direction, use_time);
}
/**
- * reverse of ike2kernel
+ * Implementation of kernel_interface_t.del_policy
*/
-static protocol_id_t proto_kernel2ike(u_int8_t proto)
+static status_t del_policy(private_kernel_interface_t *this,
+ traffic_selector_t *src_ts, traffic_selector_t *dst_ts,
+ policy_dir_t direction)
{
- switch (proto)
- {
- case IPPROTO_ESP:
- return PROTO_ESP;
- case IPPROTO_AH:
- return PROTO_AH;
- default:
- return proto;
- }
+ return this->ipsec->del_policy(this->ipsec, src_ts, dst_ts, direction);
}
/**
- * convert a host_t to a struct xfrm_address
+ * Implementation of kernel_interface_t.get_source_addr
*/
-static void host2xfrm(host_t *host, xfrm_address_t *xfrm)
+static host_t *get_source_addr(private_kernel_interface_t *this, host_t *dest)
{
- chunk_t chunk = host->get_address(host);
- memcpy(xfrm, chunk.ptr, min(chunk.len, sizeof(xfrm_address_t)));
+ return this->net->get_source_addr(this->net, dest);
}
/**
- * convert a traffic selector address range to subnet and its mask.
+ * Implementation of kernel_interface_t.get_nexthop
*/
-static void ts2subnet(traffic_selector_t* ts,
- xfrm_address_t *net, u_int8_t *mask)
+static host_t *get_nexthop(private_kernel_interface_t *this, host_t *dest)
{
- /* there is no way to do this cleanly, as the address range may
- * be anything else but a subnet. We use from_addr as subnet
- * and try to calculate a usable subnet mask.
- */
- int byte, bit;
- bool found = FALSE;
- chunk_t from, to;
- size_t size = (ts->get_type(ts) == TS_IPV4_ADDR_RANGE) ? 4 : 16;
-
- from = ts->get_from_address(ts);
- to = ts->get_to_address(ts);
-
- *mask = (size * 8);
- /* go trough all bits of the addresses, beginning in the front.
- * as long as they are equal, the subnet gets larger
- */
- for (byte = 0; byte < size; byte++)
- {
- for (bit = 7; bit >= 0; bit--)
- {
- if ((1<<bit & from.ptr[byte]) != (1<<bit & to.ptr[byte]))
- {
- *mask = ((7 - bit) + (byte * 8));
- found = TRUE;
- break;
- }
- }
- if (found)
- {
- break;
- }
- }
- memcpy(net, from.ptr, from.len);
- chunk_free(&from);
- chunk_free(&to);
+ return this->net->get_nexthop(this->net, dest);
}
/**
- * convert a traffic selector port range to port/portmask
+ * Implementation of kernel_interface_t.get_interface
*/
-static void ts2ports(traffic_selector_t* ts,
- u_int16_t *port, u_int16_t *mask)
+static char* get_interface(private_kernel_interface_t *this, host_t *host)
{
- /* linux does not seem to accept complex portmasks. Only
- * any or a specific port is allowed. We set to any, if we have
- * a port range, or to a specific, if we have one port only.
- */
- u_int16_t from, to;
-
- from = ts->get_from_port(ts);
- to = ts->get_to_port(ts);
-
- if (from == to)
- {
- *port = htons(from);
- *mask = ~0;
- }
- else
- {
- *port = 0;
- *mask = 0;
- }
+ return this->net->get_interface(this->net, host);
}
/**
- * convert a pair of traffic_selectors to a xfrm_selector
+ * Implementation of kernel_interface_t.create_address_enumerator
*/
-static struct xfrm_selector ts2selector(traffic_selector_t *src,
- traffic_selector_t *dst)
+static enumerator_t *create_address_enumerator(private_kernel_interface_t *this,
+ bool include_down_ifaces, bool include_virtual_ips)
{
- struct xfrm_selector sel;
-
- memset(&sel, 0, sizeof(sel));
- sel.family = (src->get_type(src) == TS_IPV4_ADDR_RANGE) ? AF_INET : AF_INET6;
- /* src or dest proto may be "any" (0), use more restrictive one */
- sel.proto = max(src->get_protocol(src), dst->get_protocol(dst));
- ts2subnet(dst, &sel.daddr, &sel.prefixlen_d);
- ts2subnet(src, &sel.saddr, &sel.prefixlen_s);
- ts2ports(dst, &sel.dport, &sel.dport_mask);
- ts2ports(src, &sel.sport, &sel.sport_mask);
- sel.ifindex = 0;
- sel.user = 0;
-
- return sel;
+ return this->net->create_address_enumerator(this->net, include_down_ifaces,
+ include_virtual_ips);
}
/**
- * Creates an rtattr and adds it to the netlink message
+ * Implementation of kernel_interface_t.add_ip
*/
-static void add_attribute(struct nlmsghdr *hdr, int rta_type, chunk_t data,
- size_t buflen)
+static status_t add_ip(private_kernel_interface_t *this, host_t *virtual_ip,
+ host_t *iface_ip)
{
- struct rtattr *rta;
-
- if (NLMSG_ALIGN(hdr->nlmsg_len) + RTA_ALIGN(data.len) > buflen)
- {
- DBG1(DBG_KNL, "unable to add attribute, buffer too small");
- return;
- }
-
- rta = (struct rtattr*)(((char*)hdr) + NLMSG_ALIGN(hdr->nlmsg_len));
- rta->rta_type = rta_type;
- rta->rta_len = RTA_LENGTH(data.len);
- memcpy(RTA_DATA(rta), data.ptr, data.len);
- hdr->nlmsg_len = NLMSG_ALIGN(hdr->nlmsg_len) + rta->rta_len;
+ return this->net->add_ip(this->net, virtual_ip, iface_ip);
}
/**
- * process a XFRM_MSG_ACQUIRE from kernel
+ * Implementation of kernel_interface_t.del_ip
*/
-static void process_acquire(private_kernel_interface_t *this, struct nlmsghdr *hdr)
+static status_t del_ip(private_kernel_interface_t *this, host_t *virtual_ip)
{
- u_int32_t reqid = 0;
- int proto = 0;
- job_t *job;
- struct rtattr *rtattr = XFRM_RTA(hdr, struct xfrm_user_acquire);
- size_t rtsize = XFRM_PAYLOAD(hdr, struct xfrm_user_tmpl);
-
- if (RTA_OK(rtattr, rtsize))
- {
- if (rtattr->rta_type == XFRMA_TMPL)
- {
- struct xfrm_user_tmpl* tmpl = (struct xfrm_user_tmpl*)RTA_DATA(rtattr);
- reqid = tmpl->reqid;
- proto = tmpl->id.proto;
- }
- }
- switch (proto)
- {
- case 0:
- case IPPROTO_ESP:
- case IPPROTO_AH:
- break;
- default:
- /* acquire for AH/ESP only, not for IPCOMP */
- return;
- }
- if (reqid == 0)
- {
- DBG1(DBG_KNL, "received a XFRM_MSG_ACQUIRE, but no reqid found");
- return;
- }
- DBG2(DBG_KNL, "received a XFRM_MSG_ACQUIRE");
- DBG1(DBG_KNL, "creating acquire job for CHILD_SA with reqid {%d}", reqid);
- job = (job_t*)acquire_job_create(reqid);
- charon->processor->queue_job(charon->processor, job);
+ return this->net->del_ip(this->net, virtual_ip);
}
/**
- * process a XFRM_MSG_EXPIRE from kernel
+ * Implementation of kernel_interface_t.add_route
*/
-static void process_expire(private_kernel_interface_t *this, struct nlmsghdr *hdr)
+static status_t add_route(private_kernel_interface_t *this, chunk_t dst_net,
+ u_int8_t prefixlen, host_t *gateway, host_t *src_ip, char *if_name)
{
- job_t *job;
- protocol_id_t protocol;
- u_int32_t spi, reqid;
- struct xfrm_user_expire *expire;
-
- expire = (struct xfrm_user_expire*)NLMSG_DATA(hdr);
- protocol = proto_kernel2ike(expire->state.id.proto);
- spi = expire->state.id.spi;
- reqid = expire->state.reqid;
-
- DBG2(DBG_KNL, "received a XFRM_MSG_EXPIRE");
-
- if (protocol != PROTO_ESP && protocol != PROTO_AH)
- {
- DBG2(DBG_KNL, "ignoring XFRM_MSG_EXPIRE for SA with SPI %.8x and reqid {%d} "
- "which is not a CHILD_SA", ntohl(spi), reqid);
- return;
- }
-
- DBG1(DBG_KNL, "creating %s job for %N CHILD_SA with SPI %.8x and reqid {%d}",
- expire->hard ? "delete" : "rekey", protocol_id_names,
- protocol, ntohl(spi), reqid);
- if (expire->hard)
- {
- job = (job_t*)delete_child_sa_job_create(reqid, protocol, spi);
- }
- else
- {
- job = (job_t*)rekey_child_sa_job_create(reqid, protocol, spi);
- }
- charon->processor->queue_job(charon->processor, job);
+ return this->net->add_route(this->net, dst_net, prefixlen, gateway, src_ip,
+ if_name);
}
/**
- * start a roaming job. We delay it for a second and fire only one job
- * for multiple events. Otherwise we would create two many jobs.
+ * Implementation of kernel_interface_t.del_route
*/
-static void fire_roam_job(private_kernel_interface_t *this, bool address)
+static status_t del_route(private_kernel_interface_t *this, chunk_t dst_net,
+ u_int8_t prefixlen, host_t *gateway, host_t *src_ip, char *if_name)
{
- struct timeval now;
-
- if (gettimeofday(&now, NULL) == 0)
- {
- if (timercmp(&now, &this->last_roam, >))
- {
- now.tv_usec += ROAM_DELAY * 1000;
- while (now.tv_usec > 1000000)
- {
- now.tv_sec++;
- now.tv_usec -= 1000000;
- }
- this->last_roam = now;
- charon->scheduler->schedule_job(charon->scheduler,
- (job_t*)roam_job_create(address), ROAM_DELAY);
- }
- }
+ return this->net->del_route(this->net, dst_net, prefixlen, gateway, src_ip,
+ if_name);
}
+
/**
- * get the refcount of a virtual ip
+ * Implementation of kernel_interface_t.add_ipsec_interface.
*/
-static int get_vip_refcount(private_kernel_interface_t *this, host_t* ip)
+static void add_ipsec_interface(private_kernel_interface_t *this,
+ kernel_ipsec_constructor_t *create)
{
- iterator_t *ifaces, *addrs;
- iface_entry_t *iface;
- addr_entry_t *addr;
- int refcount = 0;
-
- ifaces = this->ifaces->create_iterator(this->ifaces, TRUE);
- while (ifaces->iterate(ifaces, (void**)&iface))
- {
- addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
- while (addrs->iterate(addrs, (void**)&addr))
- {
- if (addr->virtual && (iface->flags & IFF_UP) &&
- ip->ip_equals(ip, addr->ip))
- {
- refcount = addr->refcount;
- break;
- }
- }
- addrs->destroy(addrs);
- if (refcount)
- {
- break;
- }
- }
- ifaces->destroy(ifaces);
-
- return refcount;
+ this->mutex->lock(this->mutex);
+ this->ipsec_interfaces->insert_last(this->ipsec_interfaces, create);
+ this->mutex->unlock(this->mutex);
}
/**
- * process RTM_NEWLINK/RTM_DELLINK from kernel
+ * Implementation of kernel_interface_t.remove_ipsec_interface.
*/
-static void process_link(private_kernel_interface_t *this,
- struct nlmsghdr *hdr, bool event)
+static void remove_ipsec_interface(private_kernel_interface_t *this,
+ kernel_ipsec_constructor_t *create)
{
- struct ifinfomsg* msg = (struct ifinfomsg*)(NLMSG_DATA(hdr));
- struct rtattr *rta = IFLA_RTA(msg);
- size_t rtasize = IFLA_PAYLOAD (hdr);
- iterator_t *iterator;
- iface_entry_t *current, *entry = NULL;
- char *name = NULL;
- bool update = FALSE;
-
- while(RTA_OK(rta, rtasize))
- {
- switch (rta->rta_type)
- {
- case IFLA_IFNAME:
- name = RTA_DATA(rta);
- break;
- }
- rta = RTA_NEXT(rta, rtasize);
- }
- if (!name)
- {
- name = "(unknown)";
- }
-
- switch (hdr->nlmsg_type)
- {
- case RTM_NEWLINK:
- {
- if (msg->ifi_flags & IFF_LOOPBACK)
- { /* ignore loopback interfaces */
- break;
- }
- iterator = this->ifaces->create_iterator_locked(this->ifaces,
- &this->mutex);
- while (iterator->iterate(iterator, (void**)¤t))
- {
- if (current->ifindex == msg->ifi_index)
- {
- entry = current;
- break;
- }
- }
- if (!entry)
- {
- entry = malloc_thing(iface_entry_t);
- entry->ifindex = msg->ifi_index;
- entry->flags = 0;
- entry->addrs = linked_list_create();
- this->ifaces->insert_last(this->ifaces, entry);
- }
- memcpy(entry->ifname, name, IFNAMSIZ);
- entry->ifname[IFNAMSIZ-1] = '\0';
- if (event)
- {
- if (!(entry->flags & IFF_UP) && (msg->ifi_flags & IFF_UP))
- {
- update = TRUE;
- DBG1(DBG_KNL, "interface %s activated", name);
- }
- if ((entry->flags & IFF_UP) && !(msg->ifi_flags & IFF_UP))
- {
- update = TRUE;
- DBG1(DBG_KNL, "interface %s deactivated", name);
- }
- }
- entry->flags = msg->ifi_flags;
- iterator->destroy(iterator);
- break;
- }
- case RTM_DELLINK:
- {
- iterator = this->ifaces->create_iterator_locked(this->ifaces,
- &this->mutex);
- while (iterator->iterate(iterator, (void**)¤t))
- {
- if (current->ifindex == msg->ifi_index)
- {
- /* we do not remove it, as an address may be added to a
- * "down" interface and we wan't to know that. */
- current->flags = msg->ifi_flags;
- break;
- }
- }
- iterator->destroy(iterator);
- break;
- }
- }
-
- /* send an update to all IKE_SAs */
- if (update && event)
- {
- fire_roam_job(this, TRUE);
- }
+ this->mutex->lock(this->mutex);
+ this->ipsec_interfaces->remove(this->ipsec_interfaces, create, NULL);
+ this->mutex->unlock(this->mutex);
}
/**
- * process RTM_NEWADDR/RTM_DELADDR from kernel
+ * Implementation of kernel_interface_t.add_ipsec_interface.
*/
-static void process_addr(private_kernel_interface_t *this,
- struct nlmsghdr *hdr, bool event)
+static void add_net_interface(private_kernel_interface_t *this,
+ kernel_net_constructor_t *create)
{
- struct ifaddrmsg* msg = (struct ifaddrmsg*)(NLMSG_DATA(hdr));
- struct rtattr *rta = IFA_RTA(msg);
- size_t rtasize = IFA_PAYLOAD (hdr);
- host_t *host = NULL;
- iterator_t *ifaces, *addrs;
- iface_entry_t *iface;
- addr_entry_t *addr;
- chunk_t local = chunk_empty, address = chunk_empty;
- bool update = FALSE, found = FALSE, changed = FALSE;
-
- while(RTA_OK(rta, rtasize))
- {
- switch (rta->rta_type)
- {
- case IFA_LOCAL:
- local.ptr = RTA_DATA(rta);
- local.len = RTA_PAYLOAD(rta);
- break;
- case IFA_ADDRESS:
- address.ptr = RTA_DATA(rta);
- address.len = RTA_PAYLOAD(rta);
- break;
- }
- rta = RTA_NEXT(rta, rtasize);
- }
-
- /* For PPP interfaces, we need the IFA_LOCAL address,
- * IFA_ADDRESS is the peers address. But IFA_LOCAL is
- * not included in all cases (IPv6?), so fallback to IFA_ADDRESS. */
- if (local.ptr)
- {
- host = host_create_from_chunk(msg->ifa_family, local, 0);
- }
- else if (address.ptr)
- {
- host = host_create_from_chunk(msg->ifa_family, address, 0);
- }
-
- if (host == NULL)
- { /* bad family? */
- return;
- }
-
- ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
- while (ifaces->iterate(ifaces, (void**)&iface))
- {
- if (iface->ifindex == msg->ifa_index)
- {
- addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
- while (addrs->iterate(addrs, (void**)&addr))
- {
- if (host->ip_equals(host, addr->ip))
- {
- found = TRUE;
- if (hdr->nlmsg_type == RTM_DELADDR)
- {
- addrs->remove(addrs);
- if (!addr->virtual)
- {
- changed = TRUE;
- DBG1(DBG_KNL, "%H disappeared from %s",
- host, iface->ifname);
- }
- addr_entry_destroy(addr);
- }
- else if (hdr->nlmsg_type == RTM_NEWADDR && addr->virtual)
- {
- addr->refcount = 1;
- }
- }
- }
- addrs->destroy(addrs);
-
- if (hdr->nlmsg_type == RTM_NEWADDR)
- {
- if (!found)
- {
- found = TRUE;
- changed = TRUE;
- addr = malloc_thing(addr_entry_t);
- addr->ip = host->clone(host);
- addr->virtual = FALSE;
- addr->refcount = 1;
- addr->scope = msg->ifa_scope;
-
- iface->addrs->insert_last(iface->addrs, addr);
- if (event)
- {
- DBG1(DBG_KNL, "%H appeared on %s", host, iface->ifname);
- }
- }
- }
- if (found && (iface->flags & IFF_UP))
- {
- update = TRUE;
- }
- break;
- }
- }
- ifaces->destroy(ifaces);
- host->destroy(host);
-
- /* send an update to all IKE_SAs */
- if (update && event && changed)
- {
- fire_roam_job(this, TRUE);
- }
+ this->mutex->lock(this->mutex);
+ this->net_interfaces->insert_last(this->net_interfaces, create);
+ this->mutex->unlock(this->mutex);
}
/**
- * process RTM_NEWROUTE and RTM_DELROUTE from kernel
+ * Implementation of kernel_interface_t.remove_ipsec_interface.
*/
-static void process_route(private_kernel_interface_t *this, struct nlmsghdr *hdr)
+static void remove_net_interface(private_kernel_interface_t *this,
+ kernel_net_constructor_t *create)
{
- struct rtmsg* msg = (struct rtmsg*)(NLMSG_DATA(hdr));
- struct rtattr *rta = RTM_RTA(msg);
- size_t rtasize = RTM_PAYLOAD(hdr);
- host_t *host = NULL;
-
- while (RTA_OK(rta, rtasize))
- {
- switch (rta->rta_type)
- {
- case RTA_PREFSRC:
- host = host_create_from_chunk(msg->rtm_family,
- chunk_create(RTA_DATA(rta), RTA_PAYLOAD(rta)), 0);
- break;
- }
- rta = RTA_NEXT(rta, rtasize);
- }
- if (host)
- {
- if (!get_vip_refcount(this, host))
- { /* ignore routes added for virtual IPs */
- fire_roam_job(this, FALSE);
- }
- host->destroy(host);
- }
+ this->mutex->lock(this->mutex);
+ this->net_interfaces->remove(this->net_interfaces, create, NULL);
+ this->mutex->unlock(this->mutex);
}
/**
- * Receives events from kernel
+ * Implementation of kernel_interface_t.create_interfaces.
*/
-static job_requeue_t receive_events(private_kernel_interface_t *this)
+static void create_interfaces(private_kernel_interface_t *this)
{
- char response[1024];
- struct nlmsghdr *hdr = (struct nlmsghdr*)response;
- struct sockaddr_nl addr;
- socklen_t addr_len = sizeof(addr);
- int len, oldstate, maxfd, selected;
- fd_set rfds;
-
- FD_ZERO(&rfds);
- FD_SET(this->socket_xfrm_events, &rfds);
- FD_SET(this->socket_rt_events, &rfds);
- maxfd = max(this->socket_xfrm_events, this->socket_rt_events);
+ kernel_ipsec_constructor_t create_ipsec;
+ kernel_net_constructor_t create_net;
- pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &oldstate);
- selected = select(maxfd + 1, &rfds, NULL, NULL, NULL);
- pthread_setcancelstate(oldstate, NULL);
- if (selected <= 0)
- {
- DBG1(DBG_KNL, "selecting on sockets failed: %s", strerror(errno));
- return JOB_REQUEUE_FAIR;
- }
- if (FD_ISSET(this->socket_xfrm_events, &rfds))
- {
- selected = this->socket_xfrm_events;
- }
- else if (FD_ISSET(this->socket_rt_events, &rfds))
- {
- selected = this->socket_rt_events;
- }
- else
+ this->mutex->lock(this->mutex);
+ if (this->ipsec_interfaces->get_first(this->ipsec_interfaces, (void**)&create_ipsec) != SUCCESS)
{
- return JOB_REQUEUE_DIRECT;
+ this->mutex->unlock(this->mutex);
+ charon->kill(charon, "no ipsec kernel interface loaded");
}
- len = recvfrom(selected, response, sizeof(response), MSG_DONTWAIT,
- (struct sockaddr*)&addr, &addr_len);
- if (len < 0)
+ if (this->net_interfaces->get_first(this->net_interfaces, (void**)&create_net) != SUCCESS)
{
- switch (errno)
- {
- case EINTR:
- /* interrupted, try again */
- return JOB_REQUEUE_DIRECT;
- case EAGAIN:
- /* no data ready, select again */
- return JOB_REQUEUE_DIRECT;
- default:
- DBG1(DBG_KNL, "unable to receive from xfrm event socket");
- sleep(1);
- return JOB_REQUEUE_FAIR;
- }
- }
- if (addr.nl_pid != 0)
- { /* not from kernel. not interested, try another one */
- return JOB_REQUEUE_DIRECT;
+ this->mutex->unlock(this->mutex);
+ charon->kill(charon, "no network kernel interface loaded");
}
+ this->mutex->unlock(this->mutex);
- while (NLMSG_OK(hdr, len))
- {
- /* looks good so far, dispatch netlink message */
- if (selected == this->socket_xfrm_events)
- {
- switch (hdr->nlmsg_type)
- {
- case XFRM_MSG_ACQUIRE:
- process_acquire(this, hdr);
- break;
- case XFRM_MSG_EXPIRE:
- process_expire(this, hdr);
- break;
- default:
- break;
- }
- }
- else if (selected == this->socket_rt_events)
- {
- switch (hdr->nlmsg_type)
- {
- case RTM_NEWADDR:
- case RTM_DELADDR:
- process_addr(this, hdr, TRUE);
- pthread_cond_broadcast(&this->cond);
- break;
- case RTM_NEWLINK:
- case RTM_DELLINK:
- process_link(this, hdr, TRUE);
- pthread_cond_broadcast(&this->cond);
- break;
- case RTM_NEWROUTE:
- case RTM_DELROUTE:
- if (this->process_route)
- {
- process_route(this, hdr);
- }
- break;
- default:
- break;
- }
- }
- hdr = NLMSG_NEXT(hdr, len);
- }
- return JOB_REQUEUE_DIRECT;
+ this->ipsec = create_ipsec();
+ this->net = create_net();
}
/**
- * send a netlink message and wait for a reply
+ * Implementation of kernel_interface_t.destroy.
*/
-static status_t netlink_send(private_kernel_interface_t *this,
- int socket, struct nlmsghdr *in,
- struct nlmsghdr **out, size_t *out_len)
+static void destroy(private_kernel_interface_t *this)
{
- int len, addr_len;
- struct sockaddr_nl addr;
- chunk_t result = chunk_empty, tmp;
- struct nlmsghdr *msg, peek;
-
- pthread_mutex_lock(&this->nl_mutex);
-
- in->nlmsg_seq = ++this->seq;
- in->nlmsg_pid = getpid();
-
- memset(&addr, 0, sizeof(addr));
- addr.nl_family = AF_NETLINK;
- addr.nl_pid = 0;
- addr.nl_groups = 0;
-
- while (TRUE)
- {
- len = sendto(socket, in, in->nlmsg_len, 0,
- (struct sockaddr*)&addr, sizeof(addr));
-
- if (len != in->nlmsg_len)
- {
- if (errno == EINTR)
- {
- /* interrupted, try again */
- continue;
- }
- pthread_mutex_unlock(&this->nl_mutex);
- DBG1(DBG_KNL, "error sending to netlink socket: %s", strerror(errno));
- return FAILED;
- }
- break;
- }
-
- while (TRUE)
- {
- char buf[4096];
- tmp.len = sizeof(buf);
- tmp.ptr = buf;
- msg = (struct nlmsghdr*)tmp.ptr;
-
- memset(&addr, 0, sizeof(addr));
- addr.nl_family = AF_NETLINK;
- addr.nl_pid = getpid();
- addr.nl_groups = 0;
- addr_len = sizeof(addr);
-
- len = recvfrom(socket, tmp.ptr, tmp.len, 0,
- (struct sockaddr*)&addr, &addr_len);
-
- if (len < 0)
- {
- if (errno == EINTR)
- {
- DBG1(DBG_KNL, "got interrupted");
- /* interrupted, try again */
- continue;
- }
- DBG1(DBG_KNL, "error reading from netlink socket: %s", strerror(errno));
- pthread_mutex_unlock(&this->nl_mutex);
- free(result.ptr);
- return FAILED;
- }
- if (!NLMSG_OK(msg, len))
- {
- DBG1(DBG_KNL, "received corrupted netlink message");
- pthread_mutex_unlock(&this->nl_mutex);
- free(result.ptr);
- return FAILED;
- }
- if (msg->nlmsg_seq != this->seq)
- {
- DBG1(DBG_KNL, "received invalid netlink sequence number");
- if (msg->nlmsg_seq < this->seq)
- {
- continue;
- }
- pthread_mutex_unlock(&this->nl_mutex);
- free(result.ptr);
- return FAILED;
- }
-
- tmp.len = len;
- result.ptr = realloc(result.ptr, result.len + tmp.len);
- memcpy(result.ptr + result.len, tmp.ptr, tmp.len);
- result.len += tmp.len;
-
- /* NLM_F_MULTI flag does not seem to be set correctly, we use sequence
- * numbers to detect multi header messages */
- len = recvfrom(socket, &peek, sizeof(peek), MSG_PEEK | MSG_DONTWAIT,
- (struct sockaddr*)&addr, &addr_len);
-
- if (len == sizeof(peek) && peek.nlmsg_seq == this->seq)
- {
- /* seems to be multipart */
- continue;
- }
- break;
- }
-
- *out_len = result.len;
- *out = (struct nlmsghdr*)result.ptr;
-
- pthread_mutex_unlock(&this->nl_mutex);
-
- return SUCCESS;
+ DESTROY_IF(this->ipsec);
+ DESTROY_IF(this->net);
+ this->ipsec_interfaces->destroy(this->ipsec_interfaces);
+ this->net_interfaces->destroy(this->net_interfaces);
+ this->mutex->destroy(this->mutex);
+ free(this);
}
-/**
- * send a netlink message and wait for its acknowledge
+/*
+ * Described in header-file
*/
-static status_t netlink_send_ack(private_kernel_interface_t *this,
- int socket, struct nlmsghdr *in)
-{
- struct nlmsghdr *out, *hdr;
- size_t len;
-
- if (netlink_send(this, socket, in, &out, &len) != SUCCESS)
- {
- return FAILED;
- }
- hdr = out;
- while (NLMSG_OK(hdr, len))
- {
- switch (hdr->nlmsg_type)
- {
- case NLMSG_ERROR:
- {
- struct nlmsgerr* err = (struct nlmsgerr*)NLMSG_DATA(hdr);
-
- if (err->error)
- {
- if (-err->error == EEXIST)
- { /* do not report existing routes */
- free(out);
- return ALREADY_DONE;
- }
- DBG1(DBG_KNL, "received netlink error: %s (%d)",
- strerror(-err->error), -err->error);
- free(out);
- return FAILED;
- }
- free(out);
- return SUCCESS;
- }
- default:
- hdr = NLMSG_NEXT(hdr, len);
- continue;
- case NLMSG_DONE:
- break;
- }
- break;
- }
- DBG1(DBG_KNL, "netlink request not acknowledged");
- free(out);
- return FAILED;
-}
-
-/**
- * Initialize a list of local addresses.
- */
-static status_t init_address_list(private_kernel_interface_t *this)
-{
- char request[BUFFER_SIZE];
- struct nlmsghdr *out, *current, *in;
- struct rtgenmsg *msg;
- size_t len;
- iterator_t *ifaces, *addrs;
- iface_entry_t *iface;
- addr_entry_t *addr;
-
- DBG1(DBG_KNL, "listening on interfaces:");
-
- memset(&request, 0, sizeof(request));
-
- in = (struct nlmsghdr*)&request;
- in->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
- in->nlmsg_flags = NLM_F_REQUEST | NLM_F_MATCH | NLM_F_ROOT;
- msg = (struct rtgenmsg*)NLMSG_DATA(in);
- msg->rtgen_family = AF_UNSPEC;
-
- /* get all links */
- in->nlmsg_type = RTM_GETLINK;
- if (netlink_send(this, this->socket_rt, in, &out, &len) != SUCCESS)
- {
- return FAILED;
- }
- current = out;
- while (NLMSG_OK(current, len))
- {
- switch (current->nlmsg_type)
- {
- case NLMSG_DONE:
- break;
- case RTM_NEWLINK:
- process_link(this, current, FALSE);
- /* fall through */
- default:
- current = NLMSG_NEXT(current, len);
- continue;
- }
- break;
- }
- free(out);
-
- /* get all interface addresses */
- in->nlmsg_type = RTM_GETADDR;
- if (netlink_send(this, this->socket_rt, in, &out, &len) != SUCCESS)
- {
- return FAILED;
- }
- current = out;
- while (NLMSG_OK(current, len))
- {
- switch (current->nlmsg_type)
- {
- case NLMSG_DONE:
- break;
- case RTM_NEWADDR:
- process_addr(this, current, FALSE);
- /* fall through */
- default:
- current = NLMSG_NEXT(current, len);
- continue;
- }
- break;
- }
- free(out);
-
- ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
- while (ifaces->iterate(ifaces, (void**)&iface))
- {
- if (iface->flags & IFF_UP)
- {
- DBG1(DBG_KNL, " %s", iface->ifname);
- addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
- while (addrs->iterate(addrs, (void**)&addr))
- {
- DBG1(DBG_KNL, " %H", addr->ip);
- }
- addrs->destroy(addrs);
- }
- }
- ifaces->destroy(ifaces);
- return SUCCESS;
-}
-
-/**
- * iterator hook to iterate over addrs
- */
-static hook_result_t addr_hook(private_kernel_interface_t *this,
- addr_entry_t *in, host_t **out)
-{
- if (in->virtual)
- { /* skip virtual interfaces added by us */
- return HOOK_SKIP;
- }
- if (in->scope >= RT_SCOPE_LINK)
- { /* skip addresses with a unusable scope */
- return HOOK_SKIP;
- }
- *out = in->ip;
- return HOOK_NEXT;
-}
-
-/**
- * iterator hook to iterate over ifaces
- */
-static hook_result_t iface_hook(private_kernel_interface_t *this,
- iface_entry_t *in, host_t **out)
-{
- if (!(in->flags & IFF_UP))
- { /* skip interfaces not up */
- return HOOK_SKIP;
- }
-
- if (this->hiter == NULL)
- {
- this->hiter = in->addrs->create_iterator(in->addrs, TRUE);
- this->hiter->set_iterator_hook(this->hiter,
- (iterator_hook_t*)addr_hook, this);
- }
- while (this->hiter->iterate(this->hiter, (void**)out))
- {
- return HOOK_AGAIN;
- }
- this->hiter->destroy(this->hiter);
- this->hiter = NULL;
- return HOOK_SKIP;
-}
-
-/**
- * Implements kernel_interface_t.create_address_iterator.
- */
-static iterator_t *create_address_iterator(private_kernel_interface_t *this)
-{
- iterator_t *iterator;
-
- /* This iterator is not only hooked, it is double-hooked. As we have stored
- * our addresses in iface_entry->addr_entry->ip, we need to iterate the
- * entries in each interface we iterate. This does the iface_hook. The
- * addr_hook returns the ip instead of the addr_entry. */
-
- iterator = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
- iterator->set_iterator_hook(iterator, (iterator_hook_t*)iface_hook, this);
- return iterator;
-}
-
-/**
- * implementation of kernel_interface_t.get_interface_name
- */
-static char *get_interface_name(private_kernel_interface_t *this, host_t* ip)
-{
- iterator_t *ifaces, *addrs;
- iface_entry_t *iface;
- addr_entry_t *addr;
- char *name = NULL;
-
- DBG2(DBG_KNL, "getting interface name for %H", ip);
-
- ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
- while (ifaces->iterate(ifaces, (void**)&iface))
- {
- addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
- while (addrs->iterate(addrs, (void**)&addr))
- {
- if (ip->ip_equals(ip, addr->ip))
- {
- name = strdup(iface->ifname);
- break;
- }
- }
- addrs->destroy(addrs);
- if (name)
- {
- break;
- }
- }
- ifaces->destroy(ifaces);
-
- if (name)
- {
- DBG2(DBG_KNL, "%H is on interface %s", ip, name);
- }
- else
- {
- DBG2(DBG_KNL, "%H is not a local address", ip);
- }
- return name;
-}
-
-/**
- * Tries to find an ip address of a local interface that is included in the
- * supplied traffic selector.
- */
-static status_t get_address_by_ts(private_kernel_interface_t *this,
- traffic_selector_t *ts, host_t **ip)
-{
- iterator_t *ifaces, *addrs;
- iface_entry_t *iface;
- addr_entry_t *addr;
- host_t *host;
- int family;
- bool found = FALSE;
-
- DBG2(DBG_KNL, "getting a local address in traffic selector %R", ts);
-
- /* if we have a family which includes localhost, we do not
- * search for an IP, we use the default */
- family = ts->get_type(ts) == TS_IPV4_ADDR_RANGE ? AF_INET : AF_INET6;
-
- if (family == AF_INET)
- {
- host = host_create_from_string("127.0.0.1", 0);
- }
- else
- {
- host = host_create_from_string("::1", 0);
- }
-
- if (ts->includes(ts, host))
- {
- *ip = host_create_any(family);
- host->destroy(host);
- DBG2(DBG_KNL, "using host %H", *ip);
- return SUCCESS;
- }
- host->destroy(host);
-
- ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
- while (ifaces->iterate(ifaces, (void**)&iface))
- {
- addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
- while (addrs->iterate(addrs, (void**)&addr))
- {
- if (ts->includes(ts, addr->ip))
- {
- found = TRUE;
- *ip = addr->ip->clone(addr->ip);
- break;
- }
- }
- addrs->destroy(addrs);
- if (found)
- {
- break;
- }
- }
- ifaces->destroy(ifaces);
-
- if (!found)
- {
- DBG1(DBG_KNL, "no local address found in traffic selector %R", ts);
- return FAILED;
- }
- DBG2(DBG_KNL, "using host %H", *ip);
- return SUCCESS;
-}
-
-/**
- * get the interface of a local address
- */
-static int get_interface_index(private_kernel_interface_t *this, host_t* ip)
-{
- iterator_t *ifaces, *addrs;
- iface_entry_t *iface;
- addr_entry_t *addr;
- int ifindex = 0;
-
- DBG2(DBG_KNL, "getting iface for %H", ip);
-
- ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
- while (ifaces->iterate(ifaces, (void**)&iface))
- {
- addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
- while (addrs->iterate(addrs, (void**)&addr))
- {
- if (ip->ip_equals(ip, addr->ip))
- {
- ifindex = iface->ifindex;
- break;
- }
- }
- addrs->destroy(addrs);
- if (ifindex)
- {
- break;
- }
- }
- ifaces->destroy(ifaces);
-
- if (ifindex == 0)
- {
- DBG1(DBG_KNL, "unable to get interface for %H", ip);
- }
- return ifindex;
-}
-
-/**
- * Manages the creation and deletion of ip addresses on an interface.
- * By setting the appropriate nlmsg_type, the ip will be set or unset.
- */
-static status_t manage_ipaddr(private_kernel_interface_t *this, int nlmsg_type,
- int flags, int if_index, host_t *ip)
-{
- unsigned char request[BUFFER_SIZE];
- struct nlmsghdr *hdr;
- struct ifaddrmsg *msg;
- chunk_t chunk;
-
- memset(&request, 0, sizeof(request));
-
- chunk = ip->get_address(ip);
-
- hdr = (struct nlmsghdr*)request;
- hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags;
- hdr->nlmsg_type = nlmsg_type;
- hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
-
- msg = (struct ifaddrmsg*)NLMSG_DATA(hdr);
- msg->ifa_family = ip->get_family(ip);
- msg->ifa_flags = 0;
- msg->ifa_prefixlen = 8 * chunk.len;
- msg->ifa_scope = RT_SCOPE_UNIVERSE;
- msg->ifa_index = if_index;
-
- add_attribute(hdr, IFA_LOCAL, chunk, sizeof(request));
-
- return netlink_send_ack(this, this->socket_rt, hdr);
-}
-
-/**
- * Manages source routes in the routing table.
- * By setting the appropriate nlmsg_type, the route added or r.
- */
-static status_t manage_srcroute(private_kernel_interface_t *this, int nlmsg_type,
- int flags, route_entry_t *route)
-{
- unsigned char request[BUFFER_SIZE];
- struct nlmsghdr *hdr;
- struct rtmsg *msg;
- chunk_t chunk;
-
- /* if route is 0.0.0.0/0, we can't install it, as it would
- * overwrite the default route. Instead, we add two routes:
- * 0.0.0.0/1 and 128.0.0.0/1 */
- if (this->routing_table == 0 && route->prefixlen == 0)
- {
- route_entry_t half;
- status_t status;
-
- half.dst_net = chunk_alloca(route->dst_net.len);
- memset(half.dst_net.ptr, 0, half.dst_net.len);
- half.src_ip = route->src_ip;
- half.gateway = route->gateway;
- half.if_index = route->if_index;
- half.prefixlen = 1;
-
- status = manage_srcroute(this, nlmsg_type, flags, &half);
- half.dst_net.ptr[0] |= 0x80;
- status = manage_srcroute(this, nlmsg_type, flags, &half);
- return status;
- }
-
- memset(&request, 0, sizeof(request));
-
- hdr = (struct nlmsghdr*)request;
- hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags;
- hdr->nlmsg_type = nlmsg_type;
- hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
-
- msg = (struct rtmsg*)NLMSG_DATA(hdr);
- msg->rtm_family = route->src_ip->get_family(route->src_ip);
- msg->rtm_dst_len = route->prefixlen;
- msg->rtm_table = this->routing_table;
- msg->rtm_protocol = RTPROT_STATIC;
- msg->rtm_type = RTN_UNICAST;
- msg->rtm_scope = RT_SCOPE_UNIVERSE;
-
- add_attribute(hdr, RTA_DST, route->dst_net, sizeof(request));
- chunk = route->src_ip->get_address(route->src_ip);
- add_attribute(hdr, RTA_PREFSRC, chunk, sizeof(request));
- chunk = route->gateway->get_address(route->gateway);
- add_attribute(hdr, RTA_GATEWAY, chunk, sizeof(request));
- chunk.ptr = (char*)&route->if_index;
- chunk.len = sizeof(route->if_index);
- add_attribute(hdr, RTA_OIF, chunk, sizeof(request));
-
- return netlink_send_ack(this, this->socket_rt, hdr);
-}
-
-/**
- * create or delete an rule to use our routing table
- */
-static status_t manage_rule(private_kernel_interface_t *this, int nlmsg_type,
- u_int32_t table, u_int32_t prio)
-{
- unsigned char request[BUFFER_SIZE];
- struct nlmsghdr *hdr;
- struct rtmsg *msg;
- chunk_t chunk;
-
- memset(&request, 0, sizeof(request));
- hdr = (struct nlmsghdr*)request;
- hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
- hdr->nlmsg_type = nlmsg_type;
- if (nlmsg_type == RTM_NEWRULE)
- {
- hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
- }
- hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
-
- msg = (struct rtmsg*)NLMSG_DATA(hdr);
- msg->rtm_table = table;
- msg->rtm_family = AF_INET;
- msg->rtm_protocol = RTPROT_BOOT;
- msg->rtm_scope = RT_SCOPE_UNIVERSE;
- msg->rtm_type = RTN_UNICAST;
-
- chunk = chunk_from_thing(prio);
- add_attribute(hdr, RTA_PRIORITY, chunk, sizeof(request));
-
- return netlink_send_ack(this, this->socket_rt, hdr);
-}
-
-/**
- * check if an address (chunk) addr is in subnet (net with net_len net bits)
- */
-static bool addr_in_subnet(chunk_t addr, chunk_t net, int net_len)
-{
- int bit, byte;
-
- if (addr.len != net.len)
- {
- return FALSE;
- }
- /* scan through all bits, beginning in the front */
- for (byte = 0; byte < addr.len; byte++)
- {
- for (bit = 7; bit >= 0; bit--)
- {
- /* check if bits are equal (or we reached the end of the net) */
- if (bit + byte * 8 > net_len)
- {
- return TRUE;
- }
- if (((1<<bit) & addr.ptr[byte]) != ((1<<bit) & net.ptr[byte]))
- {
- return FALSE;
- }
- }
- }
- return TRUE;
-}
-
-/**
- * Get a route: If "nexthop", the nexthop is returned. source addr otherwise.
- */
-static host_t *get_route(private_kernel_interface_t *this, host_t *dest,
- bool nexthop)
-{
- unsigned char request[BUFFER_SIZE];
- struct nlmsghdr *hdr, *out, *current;
- struct rtmsg *msg;
- chunk_t chunk;
- size_t len;
- int best = -1;
- host_t *src = NULL, *gtw = NULL;
-
- DBG2(DBG_KNL, "getting address to reach %H", dest);
-
- memset(&request, 0, sizeof(request));
-
- hdr = (struct nlmsghdr*)request;
- hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP | NLM_F_ROOT;
- hdr->nlmsg_type = RTM_GETROUTE;
- hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
-
- msg = (struct rtmsg*)NLMSG_DATA(hdr);
- msg->rtm_family = dest->get_family(dest);
-
- chunk = dest->get_address(dest);
- add_attribute(hdr, RTA_DST, chunk, sizeof(request));
-
- if (netlink_send(this, this->socket_rt, hdr, &out, &len) != SUCCESS)
- {
- DBG1(DBG_KNL, "getting address to %H failed", dest);
- return NULL;
- }
- current = out;
- while (NLMSG_OK(current, len))
- {
- switch (current->nlmsg_type)
- {
- case NLMSG_DONE:
- break;
- case RTM_NEWROUTE:
- {
- struct rtattr *rta;
- size_t rtasize;
- chunk_t rta_gtw, rta_src, rta_dst;
- u_int32_t rta_oif = 0;
-
- rta_gtw = rta_src = rta_dst = chunk_empty;
- msg = (struct rtmsg*)(NLMSG_DATA(current));
- rta = RTM_RTA(msg);
- rtasize = RTM_PAYLOAD(current);
- while (RTA_OK(rta, rtasize))
- {
- switch (rta->rta_type)
- {
- case RTA_PREFSRC:
- rta_src = chunk_create(RTA_DATA(rta), RTA_PAYLOAD(rta));
- break;
- case RTA_GATEWAY:
- rta_gtw = chunk_create(RTA_DATA(rta), RTA_PAYLOAD(rta));
- break;
- case RTA_DST:
- rta_dst = chunk_create(RTA_DATA(rta), RTA_PAYLOAD(rta));
- break;
- case RTA_OIF:
- if (RTA_PAYLOAD(rta) == sizeof(rta_oif))
- {
- rta_oif = *(u_int32_t*)RTA_DATA(rta);
- }
- break;
- }
- rta = RTA_NEXT(rta, rtasize);
- }
-
- /* apply the route if:
- * - it is not from our own ipsec routing table
- * - is better than a previous one
- * - is the default route or
- * - its destination net contains our destination
- */
- if ((this->routing_table == 0 ||msg->rtm_table != this->routing_table)
- && msg->rtm_dst_len > best
- && (msg->rtm_dst_len == 0 || /* default route */
- (rta_dst.ptr && addr_in_subnet(chunk, rta_dst, msg->rtm_dst_len))))
- {
- iterator_t *ifaces, *addrs;
- iface_entry_t *iface;
- addr_entry_t *addr;
-
- best = msg->rtm_dst_len;
- if (nexthop)
- {
- DESTROY_IF(gtw);
- gtw = host_create_from_chunk(msg->rtm_family, rta_gtw, 0);
- }
- else if (rta_src.ptr)
- {
- DESTROY_IF(src);
- src = host_create_from_chunk(msg->rtm_family, rta_src, 0);
- if (get_vip_refcount(this, src))
- { /* skip source address if it is installed by us */
- DESTROY_IF(src);
- src = NULL;
- current = NLMSG_NEXT(current, len);
- continue;
- }
- }
- else
- {
- /* no source addr, get one from the interfaces */
- ifaces = this->ifaces->create_iterator_locked(
- this->ifaces, &this->mutex);
- while (ifaces->iterate(ifaces, (void**)&iface))
- {
- if (iface->ifindex == rta_oif)
- {
- addrs = iface->addrs->create_iterator(
- iface->addrs, TRUE);
- while (addrs->iterate(addrs, (void**)&addr))
- {
- chunk_t ip = addr->ip->get_address(addr->ip);
- if ((msg->rtm_dst_len == 0 &&
- addr->ip->get_family(addr->ip) ==
- dest->get_family(dest)) ||
- addr_in_subnet(ip, rta_dst, msg->rtm_dst_len))
- {
- DESTROY_IF(src);
- src = addr->ip->clone(addr->ip);
- break;
- }
- }
- addrs->destroy(addrs);
- }
- }
- ifaces->destroy(ifaces);
- }
- }
- /* FALL through */
- }
- default:
- current = NLMSG_NEXT(current, len);
- continue;
- }
- break;
- }
- free(out);
-
- if (nexthop)
- {
- if (gtw)
- {
- return gtw;
- }
- return dest->clone(dest);
- }
- return src;
-}
-
-/**
- * Implementation of kernel_interface_t.get_source_addr.
- */
-static host_t* get_source_addr(private_kernel_interface_t *this, host_t *dest)
-{
- return get_route(this, dest, FALSE);
-}
-
-/**
- * Implementation of kernel_interface_t.add_ip.
- */
-static status_t add_ip(private_kernel_interface_t *this,
- host_t *virtual_ip, host_t *iface_ip)
-{
- iface_entry_t *iface;
- addr_entry_t *addr;
- iterator_t *addrs, *ifaces;
- int ifindex;
-
- DBG2(DBG_KNL, "adding virtual IP %H", virtual_ip);
-
- ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
- while (ifaces->iterate(ifaces, (void**)&iface))
- {
- bool iface_found = FALSE;
-
- addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
- while (addrs->iterate(addrs, (void**)&addr))
- {
- if (iface_ip->ip_equals(iface_ip, addr->ip))
- {
- iface_found = TRUE;
- }
- else if (virtual_ip->ip_equals(virtual_ip, addr->ip))
- {
- addr->refcount++;
- DBG2(DBG_KNL, "virtual IP %H already installed on %s",
- virtual_ip, iface->ifname);
- addrs->destroy(addrs);
- ifaces->destroy(ifaces);
- return SUCCESS;
- }
- }
- addrs->destroy(addrs);
-
- if (iface_found)
- {
- ifindex = iface->ifindex;
- addr = malloc_thing(addr_entry_t);
- addr->ip = virtual_ip->clone(virtual_ip);
- addr->refcount = 0;
- addr->virtual = TRUE;
- addr->scope = RT_SCOPE_UNIVERSE;
- iface->addrs->insert_last(iface->addrs, addr);
-
- if (manage_ipaddr(this, RTM_NEWADDR, NLM_F_CREATE | NLM_F_EXCL,
- ifindex, virtual_ip) == SUCCESS)
- {
- while (get_vip_refcount(this, virtual_ip) == 0)
- { /* wait until address appears */
- pthread_cond_wait(&this->cond, &this->mutex);
- }
- ifaces->destroy(ifaces);
- return SUCCESS;
- }
- ifaces->destroy(ifaces);
- DBG1(DBG_KNL, "adding virtual IP %H failed", virtual_ip);
- return FAILED;
- }
- }
- ifaces->destroy(ifaces);
-
- DBG1(DBG_KNL, "interface address %H not found, unable to install"
- "virtual IP %H", iface_ip, virtual_ip);
- return FAILED;
-}
-
-/**
- * Implementation of kernel_interface_t.del_ip.
- */
-static status_t del_ip(private_kernel_interface_t *this, host_t *virtual_ip)
-{
- iface_entry_t *iface;
- addr_entry_t *addr;
- iterator_t *addrs, *ifaces;
- status_t status;
- int ifindex;
-
- DBG2(DBG_KNL, "deleting virtual IP %H", virtual_ip);
-
- ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
- while (ifaces->iterate(ifaces, (void**)&iface))
- {
- addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
- while (addrs->iterate(addrs, (void**)&addr))
- {
- if (virtual_ip->ip_equals(virtual_ip, addr->ip))
- {
- ifindex = iface->ifindex;
- if (addr->refcount == 1)
- {
- status = manage_ipaddr(this, RTM_DELADDR, 0,
- ifindex, virtual_ip);
- if (status == SUCCESS)
- { /* wait until the address is really gone */
- while (get_vip_refcount(this, virtual_ip) > 0)
- {
- pthread_cond_wait(&this->cond, &this->mutex);
- }
- }
- addrs->destroy(addrs);
- ifaces->destroy(ifaces);
- return status;
- }
- else
- {
- addr->refcount--;
- }
- DBG2(DBG_KNL, "virtual IP %H used by other SAs, not deleting",
- virtual_ip);
- addrs->destroy(addrs);
- ifaces->destroy(ifaces);
- return SUCCESS;
- }
- }
- addrs->destroy(addrs);
- }
- ifaces->destroy(ifaces);
-
- DBG2(DBG_KNL, "virtual IP %H not cached, unable to delete", virtual_ip);
- return FAILED;
-}
-
-/**
- * Get an SPI for a specific protocol from the kernel.
- */
-static status_t get_spi_internal(private_kernel_interface_t *this,
- host_t *src, host_t *dst, u_int8_t proto, u_int32_t min, u_int32_t max,
- u_int32_t reqid, u_int32_t *spi)
-{
- unsigned char request[BUFFER_SIZE];
- struct nlmsghdr *hdr, *out;
- struct xfrm_userspi_info *userspi;
- u_int32_t received_spi = 0;
- size_t len;
-
- memset(&request, 0, sizeof(request));
-
- hdr = (struct nlmsghdr*)request;
- hdr->nlmsg_flags = NLM_F_REQUEST;
- hdr->nlmsg_type = XFRM_MSG_ALLOCSPI;
- hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userspi_info));
-
- userspi = (struct xfrm_userspi_info*)NLMSG_DATA(hdr);
- host2xfrm(src, &userspi->info.saddr);
- host2xfrm(dst, &userspi->info.id.daddr);
- userspi->info.id.proto = proto;
- userspi->info.mode = TRUE; /* tunnel mode */
- userspi->info.reqid = reqid;
- userspi->info.family = src->get_family(src);
- userspi->min = min;
- userspi->max = max;
-
- if (netlink_send(this, this->socket_xfrm, hdr, &out, &len) == SUCCESS)
- {
- hdr = out;
- while (NLMSG_OK(hdr, len))
- {
- switch (hdr->nlmsg_type)
- {
- case XFRM_MSG_NEWSA:
- {
- struct xfrm_usersa_info* usersa = NLMSG_DATA(hdr);
- received_spi = usersa->id.spi;
- break;
- }
- case NLMSG_ERROR:
- {
- struct nlmsgerr *err = NLMSG_DATA(hdr);
-
- DBG1(DBG_KNL, "allocating SPI failed: %s (%d)",
- strerror(-err->error), -err->error);
- break;
- }
- default:
- hdr = NLMSG_NEXT(hdr, len);
- continue;
- case NLMSG_DONE:
- break;
- }
- break;
- }
- free(out);
- }
-
- if (received_spi == 0)
- {
- return FAILED;
- }
-
- *spi = received_spi;
- return SUCCESS;
-}
-
-/**
- * Implementation of kernel_interface_t.get_spi.
- */
-static status_t get_spi(private_kernel_interface_t *this,
- host_t *src, host_t *dst,
- protocol_id_t protocol, u_int32_t reqid,
- u_int32_t *spi)
-{
- DBG2(DBG_KNL, "getting SPI for reqid {%d}", reqid);
-
- if (get_spi_internal(this, src, dst, proto_ike2kernel(protocol),
- 0xc0000000, 0xcFFFFFFF, reqid, spi) != SUCCESS)
- {
- DBG1(DBG_KNL, "unable to get SPI for reqid {%d}", reqid);
- return FAILED;
- }
-
- DBG2(DBG_KNL, "got SPI %.8x for reqid {%d}", ntohl(*spi), reqid);
-
- return SUCCESS;
-}
-
-/**
- * Implementation of kernel_interface_t.get_cpi.
- */
-static status_t get_cpi(private_kernel_interface_t *this,
- host_t *src, host_t *dst,
- u_int32_t reqid, u_int16_t *cpi)
-{
- u_int32_t received_spi = 0;
-
- DBG2(DBG_KNL, "getting CPI for reqid {%d}", reqid);
-
- if (get_spi_internal(this, src, dst,
- IPPROTO_COMP, 0x100, 0xEFFF, reqid, &received_spi) != SUCCESS)
- {
- DBG1(DBG_KNL, "unable to get CPI for reqid {%d}", reqid);
- return FAILED;
- }
-
- *cpi = htons((u_int16_t)ntohl(received_spi));
-
- DBG2(DBG_KNL, "got CPI %.4x for reqid {%d}", ntohs(*cpi), reqid);
-
- return SUCCESS;
-}
-
-/**
- * Implementation of kernel_interface_t.add_sa.
- */
-static status_t add_sa(private_kernel_interface_t *this,
- host_t *src, host_t *dst, u_int32_t spi,
- protocol_id_t protocol, u_int32_t reqid,
- u_int64_t expire_soft, u_int64_t expire_hard,
- u_int16_t enc_alg, u_int16_t enc_size,
- u_int16_t int_alg, u_int16_t int_size,
- prf_plus_t *prf_plus, mode_t mode,
- u_int16_t ipcomp, bool encap,
- bool replace)
-{
- unsigned char request[BUFFER_SIZE];
- char *alg_name;
- /* additional 4 octets KEYMAT required for AES-GCM as of RFC4106 8.1. */
- u_int16_t add_keymat = 32;
- struct nlmsghdr *hdr;
- struct xfrm_usersa_info *sa;
-
- memset(&request, 0, sizeof(request));
-
- DBG2(DBG_KNL, "adding SAD entry with SPI %.8x and reqid {%d}", ntohl(spi), reqid);
-
- hdr = (struct nlmsghdr*)request;
- hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
- hdr->nlmsg_type = replace ? XFRM_MSG_UPDSA : XFRM_MSG_NEWSA;
- hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info));
-
- sa = (struct xfrm_usersa_info*)NLMSG_DATA(hdr);
- host2xfrm(src, &sa->saddr);
- host2xfrm(dst, &sa->id.daddr);
- sa->id.spi = spi;
- sa->id.proto = proto_ike2kernel(protocol);
- sa->family = src->get_family(src);
- sa->mode = mode;
- if (mode == MODE_TUNNEL)
- {
- sa->flags |= XFRM_STATE_AF_UNSPEC;
- }
- sa->replay_window = (protocol == IPPROTO_COMP) ? 0 : 32;
- sa->reqid = reqid;
- /* we currently do not expire SAs by volume/packet count */
- sa->lft.soft_byte_limit = XFRM_INF;
- sa->lft.hard_byte_limit = XFRM_INF;
- sa->lft.soft_packet_limit = XFRM_INF;
- sa->lft.hard_packet_limit = XFRM_INF;
- /* we use lifetimes since added, not since used */
- sa->lft.soft_add_expires_seconds = expire_soft;
- sa->lft.hard_add_expires_seconds = expire_hard;
- sa->lft.soft_use_expires_seconds = 0;
- sa->lft.hard_use_expires_seconds = 0;
-
- struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_usersa_info);
-
- switch (enc_alg)
- {
- case ENCR_UNDEFINED:
- /* no encryption */
- break;
- case ENCR_AES_CCM_ICV8:
- case ENCR_AES_CCM_ICV12:
- case ENCR_AES_CCM_ICV16:
- /* AES-CCM needs only 3 additional octets KEYMAT as of RFC 4309 7.1. */
- add_keymat = 24;
- /* fall-through */
- case ENCR_AES_GCM_ICV8:
- case ENCR_AES_GCM_ICV12:
- case ENCR_AES_GCM_ICV16:
- {
- u_int16_t icv_size = 0;
- rthdr->rta_type = XFRMA_ALG_AEAD;
- alg_name = lookup_algorithm(encryption_algs, enc_alg, &icv_size);
- if (alg_name == NULL)
- {
- DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
- encryption_algorithm_names, enc_alg);
- return FAILED;
- }
- DBG2(DBG_KNL, " using encryption algorithm %N with key size %d",
- encryption_algorithm_names, enc_alg, enc_size);
-
- /* additional KEYMAT required */
- enc_size += add_keymat;
-
- rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo_aead) + enc_size / 8);
- hdr->nlmsg_len += rthdr->rta_len;
- if (hdr->nlmsg_len > sizeof(request))
- {
- return FAILED;
- }
-
- struct xfrm_algo_aead* algo = (struct xfrm_algo_aead*)RTA_DATA(rthdr);
- algo->alg_key_len = enc_size;
- algo->alg_icv_len = icv_size;
- strcpy(algo->alg_name, alg_name);
- prf_plus->get_bytes(prf_plus, enc_size / 8, algo->alg_key);
-
- rthdr = XFRM_RTA_NEXT(rthdr);
- break;
- }
- default:
- {
- rthdr->rta_type = XFRMA_ALG_CRYPT;
- alg_name = lookup_algorithm(encryption_algs, enc_alg, &enc_size);
- if (alg_name == NULL)
- {
- DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
- encryption_algorithm_names, enc_alg);
- return FAILED;
- }
- DBG2(DBG_KNL, " using encryption algorithm %N with key size %d",
- encryption_algorithm_names, enc_alg, enc_size);
-
- rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + enc_size / 8);
- hdr->nlmsg_len += rthdr->rta_len;
- if (hdr->nlmsg_len > sizeof(request))
- {
- return FAILED;
- }
-
- struct xfrm_algo* algo = (struct xfrm_algo*)RTA_DATA(rthdr);
- algo->alg_key_len = enc_size;
- strcpy(algo->alg_name, alg_name);
- prf_plus->get_bytes(prf_plus, enc_size / 8, algo->alg_key);
-
- rthdr = XFRM_RTA_NEXT(rthdr);
- break;
- }
- }
-
- if (int_alg != AUTH_UNDEFINED)
- {
- rthdr->rta_type = XFRMA_ALG_AUTH;
- alg_name = lookup_algorithm(integrity_algs, int_alg, &int_size);
- if (alg_name == NULL)
- {
- DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
- integrity_algorithm_names, int_alg);
- return FAILED;
- }
- DBG2(DBG_KNL, " using integrity algorithm %N with key size %d",
- integrity_algorithm_names, int_alg, int_size);
-
- rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + int_size / 8);
- hdr->nlmsg_len += rthdr->rta_len;
- if (hdr->nlmsg_len > sizeof(request))
- {
- return FAILED;
- }
-
- struct xfrm_algo* algo = (struct xfrm_algo*)RTA_DATA(rthdr);
- algo->alg_key_len = int_size;
- strcpy(algo->alg_name, alg_name);
- prf_plus->get_bytes(prf_plus, int_size / 8, algo->alg_key);
-
- rthdr = XFRM_RTA_NEXT(rthdr);
- }
-
- if (ipcomp != IPCOMP_NONE)
- {
- rthdr->rta_type = XFRMA_ALG_COMP;
- alg_name = lookup_algorithm(compression_algs, ipcomp, NULL);
- if (alg_name == NULL)
- {
- DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
- ipcomp_transform_names, ipcomp);
- return FAILED;
- }
- DBG2(DBG_KNL, " using compression algorithm %N",
- ipcomp_transform_names, ipcomp);
-
- rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo));
- hdr->nlmsg_len += rthdr->rta_len;
- if (hdr->nlmsg_len > sizeof(request))
- {
- return FAILED;
- }
-
- struct xfrm_algo* algo = (struct xfrm_algo*)RTA_DATA(rthdr);
- algo->alg_key_len = 0;
- strcpy(algo->alg_name, alg_name);
-
- rthdr = XFRM_RTA_NEXT(rthdr);
- }
-
- if (encap)
- {
- rthdr->rta_type = XFRMA_ENCAP;
- rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_encap_tmpl));
-
- hdr->nlmsg_len += rthdr->rta_len;
- if (hdr->nlmsg_len > sizeof(request))
- {
- return FAILED;
- }
-
- struct xfrm_encap_tmpl* tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rthdr);
- tmpl->encap_type = UDP_ENCAP_ESPINUDP;
- tmpl->encap_sport = htons(src->get_port(src));
- tmpl->encap_dport = htons(dst->get_port(dst));
- memset(&tmpl->encap_oa, 0, sizeof (xfrm_address_t));
- /* encap_oa could probably be derived from the
- * traffic selectors [rfc4306, p39]. In the netlink kernel implementation
- * pluto does the same as we do here but it uses encap_oa in the
- * pfkey implementation. BUT as /usr/src/linux/net/key/af_key.c indicates
- * the kernel ignores it anyway
- * -> does that mean that NAT-T encap doesn't work in transport mode?
- * No. The reason the kernel ignores NAT-OA is that it recomputes
- * (or, rather, just ignores) the checksum. If packets pass
- * the IPsec checks it marks them "checksum ok" so OA isn't needed. */
- rthdr = XFRM_RTA_NEXT(rthdr);
- }
-
- if (netlink_send_ack(this, this->socket_xfrm, hdr) != SUCCESS)
- {
- DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x", ntohl(spi));
- return FAILED;
- }
- return SUCCESS;
-}
-
-/**
- * Get the replay state (i.e. sequence numbers) of an SA.
- */
-static status_t get_replay_state(private_kernel_interface_t *this,
- u_int32_t spi, protocol_id_t protocol, host_t *dst,
- struct xfrm_replay_state *replay)
-{
- unsigned char request[BUFFER_SIZE];
- struct nlmsghdr *hdr, *out = NULL;
- struct xfrm_aevent_id *out_aevent = NULL, *aevent_id;
- size_t len;
- struct rtattr *rta;
- size_t rtasize;
-
- memset(&request, 0, sizeof(request));
-
- DBG2(DBG_KNL, "querying replay state from SAD entry with SPI %.8x", ntohl(spi));
-
- hdr = (struct nlmsghdr*)request;
- hdr->nlmsg_flags = NLM_F_REQUEST;
- hdr->nlmsg_type = XFRM_MSG_GETAE;
- hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
-
- aevent_id = (struct xfrm_aevent_id*)NLMSG_DATA(hdr);
- aevent_id->flags = XFRM_AE_RVAL;
-
- host2xfrm(dst, &aevent_id->sa_id.daddr);
- aevent_id->sa_id.spi = spi;
- aevent_id->sa_id.proto = proto_ike2kernel(protocol);
- aevent_id->sa_id.family = dst->get_family(dst);
-
- if (netlink_send(this, this->socket_xfrm, hdr, &out, &len) == SUCCESS)
- {
- hdr = out;
- while (NLMSG_OK(hdr, len))
- {
- switch (hdr->nlmsg_type)
- {
- case XFRM_MSG_NEWAE:
- {
- out_aevent = NLMSG_DATA(hdr);
- break;
- }
- case NLMSG_ERROR:
- {
- struct nlmsgerr *err = NLMSG_DATA(hdr);
- DBG1(DBG_KNL, "querying replay state from SAD entry failed: %s (%d)",
- strerror(-err->error), -err->error);
- break;
- }
- default:
- hdr = NLMSG_NEXT(hdr, len);
- continue;
- case NLMSG_DONE:
- break;
- }
- break;
- }
- }
-
- if (out_aevent == NULL)
- {
- DBG1(DBG_KNL, "unable to query replay state from SAD entry with SPI %.8x",
- ntohl(spi));
- free(out);
- return FAILED;
- }
-
- rta = XFRM_RTA(out, struct xfrm_aevent_id);
- rtasize = XFRM_PAYLOAD(out, struct xfrm_aevent_id);
- while(RTA_OK(rta, rtasize))
- {
- if (rta->rta_type == XFRMA_REPLAY_VAL)
- {
- memcpy(replay, RTA_DATA(rta), rta->rta_len);
- free(out);
- return SUCCESS;
- }
- rta = RTA_NEXT(rta, rtasize);
- }
-
- DBG1(DBG_KNL, "unable to query replay state from SAD entry with SPI %.8x",
- ntohl(spi));
- free(out);
- return FAILED;
-}
-
-/**
- * Implementation of kernel_interface_t.update_sa.
- */
-static status_t update_sa(private_kernel_interface_t *this,
- u_int32_t spi, protocol_id_t protocol,
- host_t *src, host_t *dst,
- host_t *new_src, host_t *new_dst, bool encap)
-{
- unsigned char request[BUFFER_SIZE], *pos;
- struct nlmsghdr *hdr, *out = NULL;
- struct xfrm_usersa_id *sa_id;
- struct xfrm_usersa_info *out_sa = NULL, *sa;
- size_t len;
- struct rtattr *rta;
- size_t rtasize;
- struct xfrm_encap_tmpl* tmpl = NULL;
- bool got_replay_state;
- struct xfrm_replay_state replay;
-
- memset(&request, 0, sizeof(request));
-
- DBG2(DBG_KNL, "querying SAD entry with SPI %.8x for update", ntohl(spi));
-
- /* query the existing SA first */
- hdr = (struct nlmsghdr*)request;
- hdr->nlmsg_flags = NLM_F_REQUEST;
- hdr->nlmsg_type = XFRM_MSG_GETSA;
- hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id));
-
- sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr);
- host2xfrm(dst, &sa_id->daddr);
- sa_id->spi = spi;
- sa_id->proto = proto_ike2kernel(protocol);
- sa_id->family = dst->get_family(dst);
-
- if (netlink_send(this, this->socket_xfrm, hdr, &out, &len) == SUCCESS)
- {
- hdr = out;
- while (NLMSG_OK(hdr, len))
- {
- switch (hdr->nlmsg_type)
- {
- case XFRM_MSG_NEWSA:
- {
- out_sa = NLMSG_DATA(hdr);
- break;
- }
- case NLMSG_ERROR:
- {
- struct nlmsgerr *err = NLMSG_DATA(hdr);
- DBG1(DBG_KNL, "querying SAD entry failed: %s (%d)",
- strerror(-err->error), -err->error);
- break;
- }
- default:
- hdr = NLMSG_NEXT(hdr, len);
- continue;
- case NLMSG_DONE:
- break;
- }
- break;
- }
- }
- if (out_sa == NULL)
- {
- DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(spi));
- free(out);
- return FAILED;
- }
-
- /* try to get the replay state */
- got_replay_state = (get_replay_state(
- this, spi, protocol, dst, &replay) == SUCCESS);
-
- /* delete the old SA */
- if (this->public.del_sa(&this->public, dst, spi, protocol) != SUCCESS)
- {
- DBG1(DBG_KNL, "unable to delete old SAD entry with SPI %.8x", ntohl(spi));
- free(out);
- return FAILED;
- }
-
- DBG2(DBG_KNL, "updating SAD entry with SPI %.8x from %#H..%#H to %#H..%#H",
- ntohl(spi), src, dst, new_src, new_dst);
-
- /* copy over the SA from out to request */
- hdr = (struct nlmsghdr*)request;
- memcpy(hdr, out, min(out->nlmsg_len, sizeof(request)));
- hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
- hdr->nlmsg_type = XFRM_MSG_NEWSA;
- hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info));
- sa = NLMSG_DATA(hdr);
- sa->family = new_dst->get_family(new_dst);
-
- if (!src->ip_equals(src, new_src))
- {
- host2xfrm(new_src, &sa->saddr);
- }
- if (!dst->ip_equals(dst, new_dst))
- {
- host2xfrm(new_dst, &sa->id.daddr);
- }
-
- rta = XFRM_RTA(out, struct xfrm_usersa_info);
- rtasize = XFRM_PAYLOAD(out, struct xfrm_usersa_info);
- pos = (u_char*)XFRM_RTA(hdr, struct xfrm_usersa_info);
- while(RTA_OK(rta, rtasize))
- {
- /* copy all attributes, but not XFRMA_ENCAP if we are disabling it */
- if (rta->rta_type != XFRMA_ENCAP || encap)
- {
- if (rta->rta_type == XFRMA_ENCAP)
- { /* update encap tmpl */
- tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rta);
- tmpl->encap_sport = ntohs(new_src->get_port(new_src));
- tmpl->encap_dport = ntohs(new_dst->get_port(new_dst));
- }
- memcpy(pos, rta, rta->rta_len);
- pos += RTA_ALIGN(rta->rta_len);
- hdr->nlmsg_len += RTA_ALIGN(rta->rta_len);
- }
- rta = RTA_NEXT(rta, rtasize);
- }
-
- rta = (struct rtattr*)pos;
- if (tmpl == NULL && encap)
- { /* add tmpl if we are enabling it */
- rta->rta_type = XFRMA_ENCAP;
- rta->rta_len = RTA_LENGTH(sizeof(struct xfrm_encap_tmpl));
-
- hdr->nlmsg_len += rta->rta_len;
- if (hdr->nlmsg_len > sizeof(request))
- {
- return FAILED;
- }
-
- tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rta);
- tmpl->encap_type = UDP_ENCAP_ESPINUDP;
- tmpl->encap_sport = ntohs(new_src->get_port(new_src));
- tmpl->encap_dport = ntohs(new_dst->get_port(new_dst));
- memset(&tmpl->encap_oa, 0, sizeof (xfrm_address_t));
-
- rta = XFRM_RTA_NEXT(rta);
- }
-
- if (got_replay_state)
- { /* copy the replay data if available */
- rta->rta_type = XFRMA_REPLAY_VAL;
- rta->rta_len = RTA_LENGTH(sizeof(struct xfrm_replay_state));
-
- hdr->nlmsg_len += rta->rta_len;
- if (hdr->nlmsg_len > sizeof(request))
- {
- return FAILED;
- }
- memcpy(RTA_DATA(rta), &replay, sizeof(replay));
-
- rta = XFRM_RTA_NEXT(rta);
- }
-
- if (netlink_send_ack(this, this->socket_xfrm, hdr) != SUCCESS)
- {
- DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(spi));
- free(out);
- return FAILED;
- }
- free(out);
-
- return SUCCESS;
-}
-
-/**
- * Implementation of kernel_interface_t.query_sa.
- */
-static status_t query_sa(private_kernel_interface_t *this, host_t *dst,
- u_int32_t spi, protocol_id_t protocol,
- u_int32_t *use_time)
-{
- unsigned char request[BUFFER_SIZE];
- struct nlmsghdr *out = NULL, *hdr;
- struct xfrm_usersa_id *sa_id;
- struct xfrm_usersa_info *sa = NULL;
- size_t len;
-
- DBG2(DBG_KNL, "querying SAD entry with SPI %.8x", ntohl(spi));
- memset(&request, 0, sizeof(request));
-
- hdr = (struct nlmsghdr*)request;
- hdr->nlmsg_flags = NLM_F_REQUEST;
- hdr->nlmsg_type = XFRM_MSG_GETSA;
- hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info));
-
- sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr);
- host2xfrm(dst, &sa_id->daddr);
- sa_id->spi = spi;
- sa_id->proto = proto_ike2kernel(protocol);
- sa_id->family = dst->get_family(dst);
-
- if (netlink_send(this, this->socket_xfrm, hdr, &out, &len) == SUCCESS)
- {
- hdr = out;
- while (NLMSG_OK(hdr, len))
- {
- switch (hdr->nlmsg_type)
- {
- case XFRM_MSG_NEWSA:
- {
- sa = NLMSG_DATA(hdr);
- break;
- }
- case NLMSG_ERROR:
- {
- struct nlmsgerr *err = NLMSG_DATA(hdr);
- DBG1(DBG_KNL, "querying SAD entry failed: %s (%d)",
- strerror(-err->error), -err->error);
- break;
- }
- default:
- hdr = NLMSG_NEXT(hdr, len);
- continue;
- case NLMSG_DONE:
- break;
- }
- break;
- }
- }
-
- if (sa == NULL)
- {
- DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi));
- free(out);
- return FAILED;
- }
-
- *use_time = sa->curlft.use_time;
- free (out);
- return SUCCESS;
-}
-
-/**
- * Implementation of kernel_interface_t.del_sa.
- */
-static status_t del_sa(private_kernel_interface_t *this, host_t *dst,
- u_int32_t spi, protocol_id_t protocol)
-{
- unsigned char request[BUFFER_SIZE];
- struct nlmsghdr *hdr;
- struct xfrm_usersa_id *sa_id;
-
- memset(&request, 0, sizeof(request));
-
- DBG2(DBG_KNL, "deleting SAD entry with SPI %.8x", ntohl(spi));
-
- hdr = (struct nlmsghdr*)request;
- hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
- hdr->nlmsg_type = XFRM_MSG_DELSA;
- hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id));
-
- sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr);
- host2xfrm(dst, &sa_id->daddr);
- sa_id->spi = spi;
- sa_id->proto = proto_ike2kernel(protocol);
- sa_id->family = dst->get_family(dst);
-
- if (netlink_send_ack(this, this->socket_xfrm, hdr) != SUCCESS)
- {
- DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x", ntohl(spi));
- return FAILED;
- }
- DBG2(DBG_KNL, "deleted SAD entry with SPI %.8x", ntohl(spi));
- return SUCCESS;
-}
-
-/**
- * Implementation of kernel_interface_t.add_policy.
- */
-static status_t add_policy(private_kernel_interface_t *this,
- host_t *src, host_t *dst,
- traffic_selector_t *src_ts,
- traffic_selector_t *dst_ts,
- policy_dir_t direction, protocol_id_t protocol,
- u_int32_t reqid, bool high_prio, mode_t mode,
- u_int16_t ipcomp)
-{
- iterator_t *iterator;
- policy_entry_t *current, *policy;
- bool found = FALSE;
- unsigned char request[BUFFER_SIZE];
- struct xfrm_userpolicy_info *policy_info;
- struct nlmsghdr *hdr;
-
- /* create a policy */
- policy = malloc_thing(policy_entry_t);
- memset(policy, 0, sizeof(policy_entry_t));
- policy->sel = ts2selector(src_ts, dst_ts);
- policy->direction = direction;
-
- /* find the policy, which matches EXACTLY */
- pthread_mutex_lock(&this->mutex);
- iterator = this->policies->create_iterator(this->policies, TRUE);
- while (iterator->iterate(iterator, (void**)¤t))
- {
- if (memeq(¤t->sel, &policy->sel, sizeof(struct xfrm_selector)) &&
- policy->direction == current->direction)
- {
- /* use existing policy */
- current->refcount++;
- DBG2(DBG_KNL, "policy %R === %R %N already exists, increasing "
- "refcount", src_ts, dst_ts,
- policy_dir_names, direction);
- free(policy);
- policy = current;
- found = TRUE;
- break;
- }
- }
- iterator->destroy(iterator);
- if (!found)
- { /* apply the new one, if we have no such policy */
- this->policies->insert_last(this->policies, policy);
- policy->refcount = 1;
- }
-
- DBG2(DBG_KNL, "adding policy %R === %R %N", src_ts, dst_ts,
- policy_dir_names, direction);
-
- memset(&request, 0, sizeof(request));
- hdr = (struct nlmsghdr*)request;
- hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
- hdr->nlmsg_type = found ? XFRM_MSG_UPDPOLICY : XFRM_MSG_NEWPOLICY;
- hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_info));
-
- policy_info = (struct xfrm_userpolicy_info*)NLMSG_DATA(hdr);
- policy_info->sel = policy->sel;
- policy_info->dir = policy->direction;
- /* calculate priority based on source selector size, small size = high prio */
- policy_info->priority = high_prio ? PRIO_HIGH : PRIO_LOW;
- policy_info->priority -= policy->sel.prefixlen_s * 10;
- policy_info->priority -= policy->sel.proto ? 2 : 0;
- policy_info->priority -= policy->sel.sport_mask ? 1 : 0;
- policy_info->action = XFRM_POLICY_ALLOW;
- policy_info->share = XFRM_SHARE_ANY;
- pthread_mutex_unlock(&this->mutex);
-
- /* policies don't expire */
- policy_info->lft.soft_byte_limit = XFRM_INF;
- policy_info->lft.soft_packet_limit = XFRM_INF;
- policy_info->lft.hard_byte_limit = XFRM_INF;
- policy_info->lft.hard_packet_limit = XFRM_INF;
- policy_info->lft.soft_add_expires_seconds = 0;
- policy_info->lft.hard_add_expires_seconds = 0;
- policy_info->lft.soft_use_expires_seconds = 0;
- policy_info->lft.hard_use_expires_seconds = 0;
-
- struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_userpolicy_info);
- rthdr->rta_type = XFRMA_TMPL;
- rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_user_tmpl));
-
- hdr->nlmsg_len += rthdr->rta_len;
- if (hdr->nlmsg_len > sizeof(request))
- {
- return FAILED;
- }
-
- struct xfrm_user_tmpl *tmpl = (struct xfrm_user_tmpl*)RTA_DATA(rthdr);
-
- if (ipcomp != IPCOMP_NONE)
- {
- tmpl->reqid = reqid;
- tmpl->id.proto = IPPROTO_COMP;
- tmpl->aalgos = tmpl->ealgos = tmpl->calgos = ~0;
- tmpl->mode = mode;
- tmpl->optional = direction != POLICY_OUT;
- tmpl->family = src->get_family(src);
-
- host2xfrm(src, &tmpl->saddr);
- host2xfrm(dst, &tmpl->id.daddr);
-
- /* add an additional xfrm_user_tmpl */
- rthdr->rta_len += RTA_LENGTH(sizeof(struct xfrm_user_tmpl));
- hdr->nlmsg_len += RTA_LENGTH(sizeof(struct xfrm_user_tmpl));
- if (hdr->nlmsg_len > sizeof(request))
- {
- return FAILED;
- }
-
- tmpl++;
- }
-
- tmpl->reqid = reqid;
- tmpl->id.proto = proto_ike2kernel(protocol);
- tmpl->aalgos = tmpl->ealgos = tmpl->calgos = ~0;
- tmpl->mode = mode;
- tmpl->family = src->get_family(src);
-
- host2xfrm(src, &tmpl->saddr);
- host2xfrm(dst, &tmpl->id.daddr);
-
- if (netlink_send_ack(this, this->socket_xfrm, hdr) != SUCCESS)
- {
- DBG1(DBG_KNL, "unable to add policy %R === %R %N", src_ts, dst_ts,
- policy_dir_names, direction);
- return FAILED;
- }
-
- /* install a route, if:
- * - we are NOT updating a policy
- * - this is a forward policy (to just get one for each child)
- * - we are in tunnel mode
- * - we are not using IPv6 (does not work correctly yet!)
- * - routing is not disabled via strongswan.conf
- */
- if (policy->route == NULL && direction == POLICY_FWD &&
- mode != MODE_TRANSPORT && src->get_family(src) != AF_INET6 &&
- this->install_routes)
- {
- policy->route = malloc_thing(route_entry_t);
- if (get_address_by_ts(this, dst_ts, &policy->route->src_ip) == SUCCESS)
- {
- /* get the nexthop to src (src as we are in POLICY_FWD).*/
- policy->route->gateway = get_route(this, src, TRUE);
- policy->route->if_index = get_interface_index(this, dst);
- policy->route->dst_net = chunk_alloc(
- policy->sel.family == AF_INET ? 4 : 16);
- memcpy(policy->route->dst_net.ptr, &policy->sel.saddr,
- policy->route->dst_net.len);
- policy->route->prefixlen = policy->sel.prefixlen_s;
-
- switch (manage_srcroute(this, RTM_NEWROUTE,
- NLM_F_CREATE | NLM_F_EXCL, policy->route))
- {
- default:
- DBG1(DBG_KNL, "unable to install source route for %H",
- policy->route->src_ip);
- /* FALL */
- case ALREADY_DONE:
- /* route exists, do not uninstall */
- route_entry_destroy(policy->route);
- policy->route = NULL;
- break;
- case SUCCESS:
- break;
- }
- }
- else
- {
- free(policy->route);
- policy->route = NULL;
- }
- }
-
- return SUCCESS;
-}
-
-/**
- * Implementation of kernel_interface_t.query_policy.
- */
-static status_t query_policy(private_kernel_interface_t *this,
- traffic_selector_t *src_ts,
- traffic_selector_t *dst_ts,
- policy_dir_t direction, u_int32_t *use_time)
-{
- unsigned char request[BUFFER_SIZE];
- struct nlmsghdr *out = NULL, *hdr;
- struct xfrm_userpolicy_id *policy_id;
- struct xfrm_userpolicy_info *policy = NULL;
- size_t len;
-
- memset(&request, 0, sizeof(request));
-
- DBG2(DBG_KNL, "querying policy %R === %R %N", src_ts, dst_ts,
- policy_dir_names, direction);
-
- hdr = (struct nlmsghdr*)request;
- hdr->nlmsg_flags = NLM_F_REQUEST;
- hdr->nlmsg_type = XFRM_MSG_GETPOLICY;
- hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id));
-
- policy_id = (struct xfrm_userpolicy_id*)NLMSG_DATA(hdr);
- policy_id->sel = ts2selector(src_ts, dst_ts);
- policy_id->dir = direction;
-
- if (netlink_send(this, this->socket_xfrm, hdr, &out, &len) == SUCCESS)
- {
- hdr = out;
- while (NLMSG_OK(hdr, len))
- {
- switch (hdr->nlmsg_type)
- {
- case XFRM_MSG_NEWPOLICY:
- {
- policy = (struct xfrm_userpolicy_info*)NLMSG_DATA(hdr);
- break;
- }
- case NLMSG_ERROR:
- {
- struct nlmsgerr *err = NLMSG_DATA(hdr);
- DBG1(DBG_KNL, "querying policy failed: %s (%d)",
- strerror(-err->error), -err->error);
- break;
- }
- default:
- hdr = NLMSG_NEXT(hdr, len);
- continue;
- case NLMSG_DONE:
- break;
- }
- break;
- }
- }
-
- if (policy == NULL)
- {
- DBG2(DBG_KNL, "unable to query policy %R === %R %N", src_ts, dst_ts,
- policy_dir_names, direction);
- free(out);
- return FAILED;
- }
- *use_time = (time_t)policy->curlft.use_time;
-
- free(out);
- return SUCCESS;
-}
-
-/**
- * Implementation of kernel_interface_t.del_policy.
- */
-static status_t del_policy(private_kernel_interface_t *this,
- traffic_selector_t *src_ts,
- traffic_selector_t *dst_ts,
- policy_dir_t direction)
-{
- policy_entry_t *current, policy, *to_delete = NULL;
- route_entry_t *route;
- unsigned char request[BUFFER_SIZE];
- struct nlmsghdr *hdr;
- struct xfrm_userpolicy_id *policy_id;
- iterator_t *iterator;
-
- DBG2(DBG_KNL, "deleting policy %R === %R %N", src_ts, dst_ts,
- policy_dir_names, direction);
-
- /* create a policy */
- memset(&policy, 0, sizeof(policy_entry_t));
- policy.sel = ts2selector(src_ts, dst_ts);
- policy.direction = direction;
-
- /* find the policy */
- iterator = this->policies->create_iterator_locked(this->policies, &this->mutex);
- while (iterator->iterate(iterator, (void**)¤t))
- {
- if (memcmp(¤t->sel, &policy.sel, sizeof(struct xfrm_selector)) == 0 &&
- policy.direction == current->direction)
- {
- to_delete = current;
- if (--to_delete->refcount > 0)
- {
- /* is used by more SAs, keep in kernel */
- DBG2(DBG_KNL, "policy still used by another CHILD_SA, not removed");
- iterator->destroy(iterator);
- return SUCCESS;
- }
- /* remove if last reference */
- iterator->remove(iterator);
- break;
- }
- }
- iterator->destroy(iterator);
- if (!to_delete)
- {
- DBG1(DBG_KNL, "deleting policy %R === %R %N failed, not found", src_ts,
- dst_ts, policy_dir_names, direction);
- return NOT_FOUND;
- }
-
- memset(&request, 0, sizeof(request));
-
- hdr = (struct nlmsghdr*)request;
- hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
- hdr->nlmsg_type = XFRM_MSG_DELPOLICY;
- hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id));
-
- policy_id = (struct xfrm_userpolicy_id*)NLMSG_DATA(hdr);
- policy_id->sel = to_delete->sel;
- policy_id->dir = direction;
-
- route = to_delete->route;
- free(to_delete);
-
- if (netlink_send_ack(this, this->socket_xfrm, hdr) != SUCCESS)
- {
- DBG1(DBG_KNL, "unable to delete policy %R === %R %N", src_ts, dst_ts,
- policy_dir_names, direction);
- return FAILED;
- }
-
- if (route)
- {
- if (manage_srcroute(this, RTM_DELROUTE, 0, route) != SUCCESS)
- {
- DBG1(DBG_KNL, "error uninstalling route installed with "
- "policy %R === %R %N", src_ts, dst_ts,
- policy_dir_names, direction);
- }
- route_entry_destroy(route);
- }
- return SUCCESS;
-}
-
-/**
- * Implementation of kernel_interface_t.destroy.
- */
-static void destroy(private_kernel_interface_t *this)
-{
- if (this->routing_table)
- {
- manage_rule(this, RTM_DELRULE, this->routing_table,
- this->routing_table_prio);
- }
-
- this->job->cancel(this->job);
- close(this->socket_xfrm_events);
- close(this->socket_xfrm);
- close(this->socket_rt_events);
- close(this->socket_rt);
- this->policies->destroy(this->policies);
- this->ifaces->destroy_function(this->ifaces, (void*)iface_entry_destroy);
- free(this);
-}
-
-/*
- * Described in header.
- */
-kernel_interface_t *kernel_interface_create()
+kernel_interface_t *kernel_interface_create()
{
private_kernel_interface_t *this = malloc_thing(private_kernel_interface_t);
- struct sockaddr_nl addr;
- /* public functions */
this->public.get_spi = (status_t(*)(kernel_interface_t*,host_t*,host_t*,protocol_id_t,u_int32_t,u_int32_t*))get_spi;
this->public.get_cpi = (status_t(*)(kernel_interface_t*,host_t*,host_t*,u_int32_t,u_int16_t*))get_cpi;
this->public.add_sa = (status_t(*)(kernel_interface_t *,host_t*,host_t*,u_int32_t,protocol_id_t,u_int32_t,u_int64_t,u_int64_t,u_int16_t,u_int16_t,u_int16_t,u_int16_t,prf_plus_t*,mode_t,u_int16_t,bool,bool))add_sa;
this->public.add_policy = (status_t(*)(kernel_interface_t*,host_t*,host_t*,traffic_selector_t*,traffic_selector_t*,policy_dir_t,protocol_id_t,u_int32_t,bool,mode_t,u_int16_t))add_policy;
this->public.query_policy = (status_t(*)(kernel_interface_t*,traffic_selector_t*,traffic_selector_t*,policy_dir_t,u_int32_t*))query_policy;
this->public.del_policy = (status_t(*)(kernel_interface_t*,traffic_selector_t*,traffic_selector_t*,policy_dir_t))del_policy;
- this->public.get_interface = (char*(*)(kernel_interface_t*,host_t*))get_interface_name;
- this->public.create_address_iterator = (iterator_t*(*)(kernel_interface_t*))create_address_iterator;
+
this->public.get_source_addr = (host_t*(*)(kernel_interface_t*, host_t *dest))get_source_addr;
+ this->public.get_nexthop = (host_t*(*)(kernel_interface_t*, host_t *dest))get_nexthop;
+ this->public.get_interface = (char*(*)(kernel_interface_t*,host_t*))get_interface;
+ this->public.create_address_enumerator = (enumerator_t*(*)(kernel_interface_t*,bool,bool))create_address_enumerator;
this->public.add_ip = (status_t(*)(kernel_interface_t*,host_t*,host_t*)) add_ip;
this->public.del_ip = (status_t(*)(kernel_interface_t*,host_t*)) del_ip;
- this->public.destroy = (void(*)(kernel_interface_t*)) destroy;
-
- /* private members */
- this->policies = linked_list_create();
- this->ifaces = linked_list_create();
- this->hiter = NULL;
- this->seq = 200;
- pthread_mutex_init(&this->mutex, NULL);
- pthread_mutex_init(&this->nl_mutex, NULL);
- pthread_cond_init(&this->cond, NULL);
- timerclear(&this->last_roam);
- this->install_routes = lib->settings->get_bool(lib->settings,
- "charon.install_routes", TRUE);
- this->routing_table = lib->settings->get_int(lib->settings,
- "charon.routing_table", IPSEC_ROUTING_TABLE);
- this->routing_table_prio = lib->settings->get_int(lib->settings,
- "charon.routing_table_prio", IPSEC_ROUTING_TABLE_PRIO);
- this->process_route = lib->settings->get_bool(lib->settings,
- "charon.process_route", TRUE);
- memset(&addr, 0, sizeof(addr));
- addr.nl_family = AF_NETLINK;
-
- /* create and bind RT socket */
- this->socket_rt = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
- if (this->socket_rt <= 0)
- {
- charon->kill(charon, "unable to create RT netlink socket");
- }
- addr.nl_groups = 0;
- if (bind(this->socket_rt, (struct sockaddr*)&addr, sizeof(addr)))
- {
- charon->kill(charon, "unable to bind RT netlink socket");
- }
-
- /* create and bind RT socket for events (address/interface/route changes) */
- this->socket_rt_events = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
- if (this->socket_rt_events <= 0)
- {
- charon->kill(charon, "unable to create RT event socket");
- }
- addr.nl_groups = RTMGRP_IPV4_IFADDR | RTMGRP_IPV6_IFADDR |
- RTMGRP_IPV4_ROUTE | RTMGRP_IPV4_ROUTE | RTMGRP_LINK;
- if (bind(this->socket_rt_events, (struct sockaddr*)&addr, sizeof(addr)))
- {
- charon->kill(charon, "unable to bind RT event socket");
- }
-
- /* create and bind XFRM socket */
- this->socket_xfrm = socket(AF_NETLINK, SOCK_RAW, NETLINK_XFRM);
- if (this->socket_xfrm <= 0)
- {
- charon->kill(charon, "unable to create XFRM netlink socket");
- }
- addr.nl_groups = 0;
- if (bind(this->socket_xfrm, (struct sockaddr*)&addr, sizeof(addr)))
- {
- charon->kill(charon, "unable to bind XFRM netlink socket");
- }
-
- /* create and bind XFRM socket for ACQUIRE & EXPIRE */
- this->socket_xfrm_events = socket(AF_NETLINK, SOCK_RAW, NETLINK_XFRM);
- if (this->socket_xfrm_events <= 0)
- {
- charon->kill(charon, "unable to create XFRM event socket");
- }
- addr.nl_groups = XFRMGRP_ACQUIRE | XFRMGRP_EXPIRE;
- if (bind(this->socket_xfrm_events, (struct sockaddr*)&addr, sizeof(addr)))
- {
- charon->kill(charon, "unable to bind XFRM event socket");
- }
-
- this->job = callback_job_create((callback_job_cb_t)receive_events,
- this, NULL, NULL);
- charon->processor->queue_job(charon->processor, (job_t*)this->job);
-
- if (init_address_list(this) != SUCCESS)
- {
- charon->kill(charon, "unable to get interface list");
- }
-
- if (this->routing_table)
- {
- if (manage_rule(this, RTM_NEWRULE, this->routing_table,
- this->routing_table_prio) != SUCCESS)
- {
- DBG1(DBG_KNL, "unable to create routing table rule");
- }
- }
+ this->public.add_route = (status_t(*)(kernel_interface_t*,chunk_t,u_int8_t,host_t*,host_t*,char*)) add_route;
+ this->public.del_route = (status_t(*)(kernel_interface_t*,chunk_t,u_int8_t,host_t*,host_t*,char*)) del_route;
+
+ this->public.add_ipsec_interface = (void(*)(kernel_interface_t*, kernel_ipsec_constructor_t))add_ipsec_interface;
+ this->public.remove_ipsec_interface = (void(*)(kernel_interface_t*, kernel_ipsec_constructor_t))remove_ipsec_interface;
+ this->public.add_net_interface = (void(*)(kernel_interface_t*, kernel_net_constructor_t))add_net_interface;
+ this->public.remove_net_interface = (void(*)(kernel_interface_t*, kernel_net_constructor_t))remove_net_interface;
+
+ this->public.create_interfaces = (void (*)(kernel_interface_t*))create_interfaces;
+ this->public.destroy = (void (*)(kernel_interface_t*))destroy;
+
+ this->ipsec_interfaces = linked_list_create();
+ this->net_interfaces = linked_list_create();
+ this->mutex = mutex_create(MUTEX_RECURSIVE);
+ this->ipsec = NULL;
+ this->net = NULL;
return &this->public;
}
#ifndef KERNEL_INTERFACE_H_
#define KERNEL_INTERFACE_H_
-typedef enum policy_dir_t policy_dir_t;
typedef struct kernel_interface_t kernel_interface_t;
#include <utils/host.h>
#include <crypto/prf_plus.h>
#include <encoding/payloads/proposal_substructure.h>
+#include <kernel/kernel_ipsec.h>
+#include <kernel/kernel_net.h>
/**
- * Direction of a policy. These are equal to those
- * defined in xfrm.h, but we want to stay implementation
- * neutral here.
+ * Constructor function for ipsec kernel interface
*/
-enum policy_dir_t {
- /** Policy for inbound traffic */
- POLICY_IN = 0,
- /** Policy for outbound traffic */
- POLICY_OUT = 1,
- /** Policy for forwarded traffic */
- POLICY_FWD = 2,
-};
+typedef kernel_ipsec_t* (*kernel_ipsec_constructor_t)(void);
+
+/**
+ * Constructor function for network kernel interface
+ */
+typedef kernel_net_t* (*kernel_net_constructor_t)(void);
/**
- * Interface to the kernel.
+ * Manager and wrapper for different kernel interfaces.
*
* The kernel interface handles the communication with the kernel
- * for SA and policy management. It allows setup of these, and provides
- * further the handling of kernel events.
- * Policy information are cached in the interface. This is necessary to do
- * reference counting. The Linux kernel does not allow the same policy
- * installed twice, but we need this as CHILD_SA exist multiple times
- * when rekeying. Thats why we do reference counting of policies.
+ * for SA and policy management and interface and IP address management.
*/
struct kernel_interface_t {
/**
* Get a SPI from the kernel.
*
- * @warning get_spi() implicitely creates an SA with
+ * @warning get_spi() implicitly creates an SA with
* the allocated SPI, therefore the replace flag
* in add_sa() must be set when installing this SA.
*
* @param protocol protocol for this SA (ESP/AH)
* @param reqid unique ID for this SA
* @param expire_soft lifetime in seconds before rekeying
- * @param expire_hard lieftime in seconds before delete
+ * @param expire_hard lifetime in seconds before delete
* @param enc_alg Algorithm to use for encryption (ESP only)
* @param enc_size key length of encryption algorithm, if dynamic
* @param int_alg Algorithm to use for integrity protection
protocol_id_t protocol, u_int32_t *use_time);
/**
- * Delete a previusly installed SA from the SAD.
+ * Delete a previously installed SA from the SAD.
*
* @param dst destination address for this SA
* @param spi SPI allocated by us or remote peer
* @param dst_ts traffic selector to match traffic dest
* @param direction direction of traffic, POLICY_IN, POLICY_OUT, POLICY_FWD
* @param protocol protocol to use to protect traffic (AH/ESP)
- * @param reqid uniqe ID of an SA to use to enforce policy
+ * @param reqid unique ID of an SA to use to enforce policy
* @param high_prio if TRUE, uses a higher priority than any with FALSE
* @param mode mode of SA (tunnel, transport)
* @param ipcomp the IPComp transform used
host_t* (*get_source_addr)(kernel_interface_t *this, host_t *dest);
/**
+ * Get the next hop for a destination.
+ *
+ * Does a route lookup to get the next hop used to reach dest.
+ * The returned host is allocated and must be destroyed.
+ *
+ * @param dest target destination address
+ * @return next hop address, NULL if unreachable
+ */
+ host_t* (*get_nexthop)(kernel_interface_t *this, host_t *dest);
+
+ /**
* Get the interface name of a local address.
*
* @param host address to get interface name from
char* (*get_interface) (kernel_interface_t *this, host_t *host);
/**
- * Creates an iterator over all local addresses.
- *
+ * Creates an enumerator over all local addresses.
+ *
* This function blocks an internal cached address list until the
- * iterator gets destroyed.
- * These hosts are read-only, do not modify or free.
- *
- * @return iterator over host_t's
+ * enumerator gets destroyed.
+ * The hosts are read-only, do not modify of free.
+ *
+ * @param include_down_ifaces TRUE to enumerate addresses from down interfaces
+ * @param include_virtual_ips TRUE to enumerate virtual ip addresses
+ * @return enumerator over host_t's
*/
- iterator_t *(*create_address_iterator) (kernel_interface_t *this);
+ enumerator_t *(*create_address_enumerator) (kernel_interface_t *this,
+ bool include_down_ifaces, bool include_virtual_ips);
/**
* Add a virtual IP to an interface.
status_t (*del_ip) (kernel_interface_t *this, host_t *virtual_ip);
/**
- * Destroys a kernel_interface object.
+ * Add a route.
+ *
+ * @param dst_net destination net
+ * @param prefixlen destination net prefix length
+ * @param gateway gateway for this route
+ * @param src_ip sourc ip of the route
+ * @param if_name name of the interface the route is bound to
+ * @return SUCCESS if operation completed
+ * ALREADY_DONE if the route already exists
+ */
+ status_t (*add_route) (kernel_interface_t *this, chunk_t dst_net, u_int8_t prefixlen,
+ host_t *gateway, host_t *src_ip, char *if_name);
+
+ /**
+ * Delete a route.
+ *
+ * @param dst_net destination net
+ * @param prefixlen destination net prefix length
+ * @param gateway gateway for this route
+ * @param src_ip sourc ip of the route
+ * @param if_name name of the interface the route is bound to
+ * @return SUCCESS if operation completed
+ */
+ status_t (*del_route) (kernel_interface_t *this, chunk_t dst_net, u_int8_t prefixlen,
+ host_t *gateway, host_t *src_ip, char *if_name);
+
+ /**
+ * manager methods
+ */
+
+ /**
+ * Register an ipsec kernel interface constructor on the manager.
+ *
+ * @param create constructor to register
+ */
+ void (*add_ipsec_interface)(kernel_interface_t *this, kernel_ipsec_constructor_t create);
+
+ /**
+ * Unregister an ipsec kernel interface constructor.
+ *
+ * @param create constructor to unregister
+ */
+ void (*remove_ipsec_interface)(kernel_interface_t *this, kernel_ipsec_constructor_t create);
+
+ /**
+ * Register a network kernel interface constructor on the manager.
+ *
+ * @param create constructor to register
+ */
+ void (*add_net_interface)(kernel_interface_t *this, kernel_net_constructor_t create);
+
+ /**
+ * Unregister a network kernel interface constructor.
+ *
+ * @param create constructor to unregister
+ */
+ void (*remove_net_interface)(kernel_interface_t *this, kernel_net_constructor_t create);
+
+ /**
+ * Create the kernel interfaces classes.
+ */
+ void (*create_interfaces)(kernel_interface_t *this);
+
+ /**
+ * Destroys a kernel_interface_manager_t object.
*/
- void (*destroy) (kernel_interface_t *kernel_interface);
+ void (*destroy) (kernel_interface_t *this);
};
/**
*/
kernel_interface_t *kernel_interface_create(void);
-#endif /*KERNEL_INTERFACE_H_ @} */
+#endif /* KERNEL_INTERFACE_H_ @} */
--- /dev/null
+/*
+ * Copyright (C) 2006-2008 Tobias Brunner
+ * Copyright (C) 2006 Daniel Roethlisberger
+ * Copyright (C) 2005-2006 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * $Id$
+ */
+
+/**
+ * @defgroup kernel_ipsec kernel_ipsec
+ * @{ @ingroup kernel
+ */
+
+#ifndef KERNEL_IPSEC_H_
+#define KERNEL_IPSEC_H_
+
+typedef enum policy_dir_t policy_dir_t;
+typedef struct kernel_ipsec_t kernel_ipsec_t;
+
+#include <utils/host.h>
+#include <crypto/prf_plus.h>
+#include <encoding/payloads/proposal_substructure.h>
+
+/**
+ * Direction of a policy. These are equal to those
+ * defined in xfrm.h, but we want to stay implementation
+ * neutral here.
+ */
+enum policy_dir_t {
+ /** Policy for inbound traffic */
+ POLICY_IN = 0,
+ /** Policy for outbound traffic */
+ POLICY_OUT = 1,
+ /** Policy for forwarded traffic */
+ POLICY_FWD = 2,
+};
+
+/**
+ * Interface to the ipsec subsystem of the kernel.
+ *
+ * The kernel ipsec interface handles the communication with the kernel
+ * for SA and policy management. It allows setup of these, and provides
+ * further the handling of kernel events.
+ * Policy information are cached in the interface. This is necessary to do
+ * reference counting. The Linux kernel does not allow the same policy
+ * installed twice, but we need this as CHILD_SA exist multiple times
+ * when rekeying. Thats why we do reference counting of policies.
+ */
+struct kernel_ipsec_t {
+
+ /**
+ * Get a SPI from the kernel.
+ *
+ * @warning get_spi() implicitly creates an SA with
+ * the allocated SPI, therefore the replace flag
+ * in add_sa() must be set when installing this SA.
+ *
+ * @param src source address of SA
+ * @param dst destination address of SA
+ * @param protocol protocol for SA (ESP/AH)
+ * @param reqid unique ID for this SA
+ * @param spi allocated spi
+ * @return SUCCESS if operation completed
+ */
+ status_t (*get_spi)(kernel_ipsec_t *this, host_t *src, host_t *dst,
+ protocol_id_t protocol, u_int32_t reqid, u_int32_t *spi);
+
+ /**
+ * Get a Compression Parameter Index (CPI) from the kernel.
+ *
+ * @param src source address of SA
+ * @param dst destination address of SA
+ * @param reqid unique ID for the corresponding SA
+ * @param cpi allocated cpi
+ * @return SUCCESS if operation completed
+ */
+ status_t (*get_cpi)(kernel_ipsec_t *this, host_t *src, host_t *dst,
+ u_int32_t reqid, u_int16_t *cpi);
+
+ /**
+ * Add an SA to the SAD.
+ *
+ * add_sa() may update an already allocated
+ * SPI (via get_spi). In this case, the replace
+ * flag must be set.
+ * This function does install a single SA for a
+ * single protocol in one direction. The kernel-interface
+ * gets the keys itself from the PRF, as we don't know
+ * his algorithms and key sizes.
+ *
+ * @param src source address for this SA
+ * @param dst destination address for this SA
+ * @param spi SPI allocated by us or remote peer
+ * @param protocol protocol for this SA (ESP/AH)
+ * @param reqid unique ID for this SA
+ * @param expire_soft lifetime in seconds before rekeying
+ * @param expire_hard lifetime in seconds before delete
+ * @param enc_alg Algorithm to use for encryption (ESP only)
+ * @param enc_size key length of encryption algorithm, if dynamic
+ * @param int_alg Algorithm to use for integrity protection
+ * @param int_size key length of integrity algorithm, if dynamic
+ * @param prf_plus PRF to derive keys from
+ * @param mode mode of the SA (tunnel, transport)
+ * @param ipcomp IPComp transform to use
+ * @param encap enable UDP encapsulation for NAT traversal
+ * @param replace Should an already installed SA be updated?
+ * @return SUCCESS if operation completed
+ */
+ status_t (*add_sa) (kernel_ipsec_t *this,
+ host_t *src, host_t *dst, u_int32_t spi,
+ protocol_id_t protocol, u_int32_t reqid,
+ u_int64_t expire_soft, u_int64_t expire_hard,
+ u_int16_t enc_alg, u_int16_t enc_size,
+ u_int16_t int_alg, u_int16_t int_size,
+ prf_plus_t *prf_plus, mode_t mode,
+ u_int16_t ipcomp, bool encap,
+ bool update);
+
+ /**
+ * Update the hosts on an installed SA.
+ *
+ * We cannot directly update the destination address as the kernel
+ * requires the spi, the protocol AND the destination address (and family)
+ * to identify SAs. Therefore if the destination address changed we
+ * create a new SA and delete the old one.
+ *
+ * @param spi SPI of the SA
+ * @param protocol protocol for this SA (ESP/AH)
+ * @param src current source address
+ * @param dst current destination address
+ * @param new_src new source address
+ * @param new_dst new destination address
+ * @param encap use UDP encapsulation
+ * @return SUCCESS if operation completed
+ */
+ status_t (*update_sa)(kernel_ipsec_t *this,
+ u_int32_t spi, protocol_id_t protocol,
+ host_t *src, host_t *dst,
+ host_t *new_src, host_t *new_dst, bool encap);
+
+ /**
+ * Query the use time of an SA.
+ *
+ * The use time of an SA is not the time of the last usage, but
+ * the time of the first usage of the SA.
+ *
+ * @param dst destination address for this SA
+ * @param spi SPI allocated by us or remote peer
+ * @param protocol protocol for this SA (ESP/AH)
+ * @param use_time pointer receives the time of this SA's last use
+ * @return SUCCESS if operation completed
+ */
+ status_t (*query_sa) (kernel_ipsec_t *this, host_t *dst, u_int32_t spi,
+ protocol_id_t protocol, u_int32_t *use_time);
+
+ /**
+ * Delete a previusly installed SA from the SAD.
+ *
+ * @param dst destination address for this SA
+ * @param spi SPI allocated by us or remote peer
+ * @param protocol protocol for this SA (ESP/AH)
+ * @return SUCCESS if operation completed
+ */
+ status_t (*del_sa) (kernel_ipsec_t *this, host_t *dst, u_int32_t spi,
+ protocol_id_t protocol);
+
+ /**
+ * Add a policy to the SPD.
+ *
+ * A policy is always associated to an SA. Traffic which matches a
+ * policy is handled by the SA with the same reqid.
+ *
+ * @param src source address of SA
+ * @param dst dest address of SA
+ * @param src_ts traffic selector to match traffic source
+ * @param dst_ts traffic selector to match traffic dest
+ * @param direction direction of traffic, POLICY_IN, POLICY_OUT, POLICY_FWD
+ * @param protocol protocol to use to protect traffic (AH/ESP)
+ * @param reqid unique ID of an SA to use to enforce policy
+ * @param high_prio if TRUE, uses a higher priority than any with FALSE
+ * @param mode mode of SA (tunnel, transport)
+ * @param ipcomp the IPComp transform used
+ * @return SUCCESS if operation completed
+ */
+ status_t (*add_policy) (kernel_ipsec_t *this,
+ host_t *src, host_t *dst,
+ traffic_selector_t *src_ts,
+ traffic_selector_t *dst_ts,
+ policy_dir_t direction, protocol_id_t protocol,
+ u_int32_t reqid, bool high_prio, mode_t mode,
+ u_int16_t ipcomp);
+
+ /**
+ * Query the use time of a policy.
+ *
+ * The use time of a policy is the time the policy was used
+ * for the last time.
+ *
+ * @param src_ts traffic selector to match traffic source
+ * @param dst_ts traffic selector to match traffic dest
+ * @param direction direction of traffic, POLICY_IN, POLICY_OUT, POLICY_FWD
+ * @param[out] use_time the time of this SA's last use
+ * @return SUCCESS if operation completed
+ */
+ status_t (*query_policy) (kernel_ipsec_t *this,
+ traffic_selector_t *src_ts,
+ traffic_selector_t *dst_ts,
+ policy_dir_t direction, u_int32_t *use_time);
+
+ /**
+ * Remove a policy from the SPD.
+ *
+ * The kernel interface implements reference counting for policies.
+ * If the same policy is installed multiple times (in the case of rekeying),
+ * the reference counter is increased. del_policy() decreases the ref counter
+ * and removes the policy only when no more references are available.
+ *
+ * @param src_ts traffic selector to match traffic source
+ * @param dst_ts traffic selector to match traffic dest
+ * @param direction direction of traffic, POLICY_IN, POLICY_OUT, POLICY_FWD
+ * @return SUCCESS if operation completed
+ */
+ status_t (*del_policy) (kernel_ipsec_t *this,
+ traffic_selector_t *src_ts,
+ traffic_selector_t *dst_ts,
+ policy_dir_t direction);
+
+ /**
+ * Destroy the implementation.
+ */
+ void (*destroy) (kernel_ipsec_t *this);
+};
+
+#endif /* KERNEL_IPSEC_H_ @} */
--- /dev/null
+/*
+ * Copyright (C) 2008 Tobias Brunner
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * $Id$
+ */
+
+/**
+ * @defgroup kernel_net kernel_net
+ * @{ @ingroup kernel
+ */
+
+#ifndef KERNEL_NET_H_
+#define KERNEL_NET_H_
+
+typedef struct kernel_net_t kernel_net_t;
+
+#include <utils/enumerator.h>
+#include <utils/host.h>
+
+/**
+ * Interface to the network subsystem of the kernel.
+ *
+ * The kernel network interface handles the communication with the kernel
+ * for interface and IP address management.
+ */
+struct kernel_net_t {
+
+ /**
+ * Get our outgoing source address for a destination.
+ *
+ * Does a route lookup to get the source address used to reach dest.
+ * The returned host is allocated and must be destroyed.
+ *
+ * @param dest target destination address
+ * @return outgoing source address, NULL if unreachable
+ */
+ host_t* (*get_source_addr)(kernel_net_t *this, host_t *dest);
+
+ /**
+ * Get the next hop for a destination.
+ *
+ * Does a route lookup to get the next hop used to reach dest.
+ * The returned host is allocated and must be destroyed.
+ *
+ * @param dest target destination address
+ * @return next hop address, NULL if unreachable
+ */
+ host_t* (*get_nexthop)(kernel_net_t *this, host_t *dest);
+
+ /**
+ * Get the interface name of a local address.
+ *
+ * @param host address to get interface name from
+ * @return allocated interface name, or NULL if not found
+ */
+ char* (*get_interface) (kernel_net_t *this, host_t *host);
+
+ /**
+ * Creates an enumerator over all local addresses.
+ *
+ * This function blocks an internal cached address list until the
+ * enumerator gets destroyed.
+ * The hosts are read-only, do not modify of free.
+ *
+ * @param include_down_ifaces TRUE to enumerate addresses from down interfaces
+ * @param include_virtual_ips TRUE to enumerate virtual ip addresses
+ * @return enumerator over host_t's
+ */
+ enumerator_t *(*create_address_enumerator) (kernel_net_t *this,
+ bool include_down_ifaces, bool include_virtual_ips);
+
+ /**
+ * Add a virtual IP to an interface.
+ *
+ * Virtual IPs are attached to an interface. If an IP is added multiple
+ * times, the IP is refcounted and not removed until del_ip() was called
+ * as many times as add_ip().
+ * The virtual IP is attached to the interface where the iface_ip is found.
+ *
+ * @param virtual_ip virtual ip address to assign
+ * @param iface_ip IP of an interface to attach virtual IP
+ * @return SUCCESS if operation completed
+ */
+ status_t (*add_ip) (kernel_net_t *this, host_t *virtual_ip,
+ host_t *iface_ip);
+
+ /**
+ * Remove a virtual IP from an interface.
+ *
+ * The kernel interface uses refcounting, see add_ip().
+ *
+ * @param virtual_ip virtual ip address to assign
+ * @return SUCCESS if operation completed
+ */
+ status_t (*del_ip) (kernel_net_t *this, host_t *virtual_ip);
+
+ /**
+ * Add a route.
+ *
+ * @param dst_net destination net
+ * @param prefixlen destination net prefix length
+ * @param gateway gateway for this route
+ * @param src_ip sourc ip of the route
+ * @param if_name name of the interface the route is bound to
+ * @return SUCCESS if operation completed
+ * ALREADY_DONE if the route already exists
+ */
+ status_t (*add_route) (kernel_net_t *this, chunk_t dst_net, u_int8_t prefixlen,
+ host_t *gateway, host_t *src_ip, char *if_name);
+
+ /**
+ * Delete a route.
+ *
+ * @param dst_net destination net
+ * @param prefixlen destination net prefix length
+ * @param gateway gateway for this route
+ * @param src_ip sourc ip of the route
+ * @param if_name name of the interface the route is bound to
+ * @return SUCCESS if operation completed
+ */
+ status_t (*del_route) (kernel_net_t *this, chunk_t dst_net, u_int8_t prefixlen,
+ host_t *gateway, host_t *src_ip, char *if_name);
+
+ /**
+ * Destroy the implementation.
+ */
+ void (*destroy) (kernel_net_t *this);
+};
+
+#endif /* KERNEL_NET_H_ @} */
* The first uses raw sockets to allow binding of other daemons (pluto) to
* UDP/500. An installed "Linux socket filter" filters out all non-IKEv2
* traffic and handles just IKEv2 messages. An other daemon (pluto) must
- * handle all traffic seperatly, e.g. ignore IKEv2 traffic, since charon
+ * handle all traffic separately, e.g. ignore IKEv2 traffic, since charon
* handles that.
* The other implementation uses normal sockets and is built if
* --disable-pluto is given to the configure script.
};
/**
- * Create a socket_t, wich binds multiple sockets.
+ * Create a socket_t, which binds multiple sockets.
*
* @return socket_t object
*/
--- /dev/null
+
+INCLUDES = -I${linuxdir} -I$(top_srcdir)/src/libstrongswan -I$(top_srcdir)/src/charon
+
+AM_CFLAGS = -rdynamic
+
+plugin_LTLIBRARIES = libstrongswan-kernel-netlink.la
+
+libstrongswan_kernel_netlink_la_SOURCES = kernel_netlink_plugin.h kernel_netlink_plugin.c \
+ kernel_netlink_ipsec.h kernel_netlink_ipsec.c kernel_netlink_net.h kernel_netlink_net.c \
+ kernel_netlink_shared.h kernel_netlink_shared.c
+libstrongswan_kernel_netlink_la_LDFLAGS = -module
--- /dev/null
+/*
+ * Copyright (C) 2006-2008 Tobias Brunner
+ * Copyright (C) 2005-2007 Martin Willi
+ * Copyright (C) 2006-2007 Fabian Hartmann, Noah Heusser
+ * Copyright (C) 2006 Daniel Roethlisberger
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * $Id$
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <linux/xfrm.h>
+#include <linux/udp.h>
+#include <netinet/in.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+#include "kernel_netlink_ipsec.h"
+#include "kernel_netlink_shared.h"
+
+#include <daemon.h>
+#include <utils/linked_list.h>
+#include <processing/jobs/callback_job.h>
+#include <processing/jobs/acquire_job.h>
+#include <processing/jobs/rekey_child_sa_job.h>
+#include <processing/jobs/delete_child_sa_job.h>
+
+/** required for Linux 2.6.26 kernel and later */
+#ifndef XFRM_STATE_AF_UNSPEC
+#define XFRM_STATE_AF_UNSPEC 32
+#endif
+
+/** default priority of installed policies */
+#define PRIO_LOW 3000
+#define PRIO_HIGH 2000
+
+/**
+ * returns a pointer to the first rtattr following the nlmsghdr *nlh and the
+ * 'usual' netlink data x like 'struct xfrm_usersa_info'
+ */
+#define XFRM_RTA(nlh, x) ((struct rtattr*)(NLMSG_DATA(nlh) + NLMSG_ALIGN(sizeof(x))))
+/**
+ * returns a pointer to the next rtattr following rta.
+ * !!! do not use this to parse messages. use RTA_NEXT and RTA_OK instead !!!
+ */
+#define XFRM_RTA_NEXT(rta) ((struct rtattr*)(((char*)(rta)) + RTA_ALIGN((rta)->rta_len)))
+/**
+ * returns the total size of attached rta data
+ * (after 'usual' netlink data x like 'struct xfrm_usersa_info')
+ */
+#define XFRM_PAYLOAD(nlh, x) NLMSG_PAYLOAD(nlh, sizeof(x))
+
+typedef struct kernel_algorithm_t kernel_algorithm_t;
+
+/**
+ * Mapping from the algorithms defined in IKEv2 to
+ * kernel level algorithm names and their key length
+ */
+struct kernel_algorithm_t {
+ /**
+ * Identifier specified in IKEv2
+ */
+ int ikev2_id;
+
+ /**
+ * Name of the algorithm, as used as kernel identifier
+ */
+ char *name;
+
+ /**
+ * Key length in bits, if fixed size
+ */
+ u_int key_size;
+};
+
+ENUM(policy_dir_names, POLICY_IN, POLICY_FWD,
+ "in",
+ "out",
+ "fwd"
+);
+
+#define END_OF_LIST -1
+
+/**
+ * Algorithms for encryption
+ */
+static kernel_algorithm_t encryption_algs[] = {
+/* {ENCR_DES_IV64, "***", 0}, */
+ {ENCR_DES, "des", 64},
+ {ENCR_3DES, "des3_ede", 192},
+/* {ENCR_RC5, "***", 0}, */
+/* {ENCR_IDEA, "***", 0}, */
+ {ENCR_CAST, "cast128", 0},
+ {ENCR_BLOWFISH, "blowfish", 0},
+/* {ENCR_3IDEA, "***", 0}, */
+/* {ENCR_DES_IV32, "***", 0}, */
+ {ENCR_NULL, "cipher_null", 0},
+ {ENCR_AES_CBC, "aes", 0},
+/* {ENCR_AES_CTR, "***", 0}, */
+ {ENCR_AES_CCM_ICV8, "rfc4309(ccm(aes))", 64}, /* key_size = ICV size */
+ {ENCR_AES_CCM_ICV12, "rfc4309(ccm(aes))", 96}, /* key_size = ICV size */
+ {ENCR_AES_CCM_ICV16, "rfc4309(ccm(aes))", 128}, /* key_size = ICV size */
+ {ENCR_AES_GCM_ICV8, "rfc4106(gcm(aes))", 64}, /* key_size = ICV size */
+ {ENCR_AES_GCM_ICV12, "rfc4106(gcm(aes))", 96}, /* key_size = ICV size */
+ {ENCR_AES_GCM_ICV16, "rfc4106(gcm(aes))", 128}, /* key_size = ICV size */
+ {END_OF_LIST, NULL, 0},
+};
+
+/**
+ * Algorithms for integrity protection
+ */
+static kernel_algorithm_t integrity_algs[] = {
+ {AUTH_HMAC_MD5_96, "md5", 128},
+ {AUTH_HMAC_SHA1_96, "sha1", 160},
+ {AUTH_HMAC_SHA2_256_128, "sha256", 256},
+ {AUTH_HMAC_SHA2_384_192, "sha384", 384},
+ {AUTH_HMAC_SHA2_512_256, "sha512", 512},
+/* {AUTH_DES_MAC, "***", 0}, */
+/* {AUTH_KPDK_MD5, "***", 0}, */
+ {AUTH_AES_XCBC_96, "xcbc(aes)", 128},
+ {END_OF_LIST, NULL, 0},
+};
+
+/**
+ * Algorithms for IPComp
+ */
+static kernel_algorithm_t compression_algs[] = {
+/* {IPCOMP_OUI, "***", 0}, */
+ {IPCOMP_DEFLATE, "deflate", 0},
+ {IPCOMP_LZS, "lzs", 0},
+ {IPCOMP_LZJH, "lzjh", 0},
+ {END_OF_LIST, NULL, 0},
+};
+
+/**
+ * Look up a kernel algorithm name and its key size
+ */
+static char* lookup_algorithm(kernel_algorithm_t *kernel_algo,
+ u_int16_t ikev2_algo, u_int16_t *key_size)
+{
+ while (kernel_algo->ikev2_id != END_OF_LIST)
+ {
+ if (ikev2_algo == kernel_algo->ikev2_id)
+ {
+ /* match, evaluate key length */
+ if (key_size && *key_size == 0)
+ { /* update key size if not set */
+ *key_size = kernel_algo->key_size;
+ }
+ return kernel_algo->name;
+ }
+ kernel_algo++;
+ }
+ return NULL;
+}
+
+typedef struct route_entry_t route_entry_t;
+
+/**
+ * installed routing entry
+ */
+struct route_entry_t {
+ /** Name of the interface the route is bound to */
+ char *if_name;
+
+ /** Source ip of the route */
+ host_t *src_ip;
+
+ /** gateway for this route */
+ host_t *gateway;
+
+ /** Destination net */
+ chunk_t dst_net;
+
+ /** Destination net prefixlen */
+ u_int8_t prefixlen;
+};
+
+/**
+ * destroy an route_entry_t object
+ */
+static void route_entry_destroy(route_entry_t *this)
+{
+ free(this->if_name);
+ this->src_ip->destroy(this->src_ip);
+ this->gateway->destroy(this->gateway);
+ chunk_free(&this->dst_net);
+ free(this);
+}
+
+typedef struct policy_entry_t policy_entry_t;
+
+/**
+ * installed kernel policy.
+ */
+struct policy_entry_t {
+
+ /** direction of this policy: in, out, forward */
+ u_int8_t direction;
+
+ /** reqid of the policy */
+ u_int32_t reqid;
+
+ /** parameters of installed policy */
+ struct xfrm_selector sel;
+
+ /** associated route installed for this policy */
+ route_entry_t *route;
+
+ /** by how many CHILD_SA's this policy is used */
+ u_int refcount;
+};
+
+typedef struct private_kernel_netlink_ipsec_t private_kernel_netlink_ipsec_t;
+
+/**
+ * Private variables and functions of kernel_netlink class.
+ */
+struct private_kernel_netlink_ipsec_t {
+ /**
+ * Public part of the kernel_netlink_t object.
+ */
+ kernel_netlink_ipsec_t public;
+
+ /**
+ * mutex to lock access to various lists
+ */
+ pthread_mutex_t mutex;
+
+ /**
+ * List of installed policies (policy_entry_t)
+ */
+ linked_list_t *policies;
+
+ /**
+ * job receiving netlink events
+ */
+ callback_job_t *job;
+
+ /**
+ * Netlink xfrm socket (IPsec)
+ */
+ netlink_socket_t *socket_xfrm;
+
+ /**
+ * netlink xfrm socket to receive acquire and expire events
+ */
+ int socket_xfrm_events;
+
+ /**
+ * whether to install routes along policies
+ */
+ bool install_routes;
+};
+
+/**
+ * convert a IKEv2 specific protocol identifier to the kernel one
+ */
+static u_int8_t proto_ike2kernel(protocol_id_t proto)
+{
+ switch (proto)
+ {
+ case PROTO_ESP:
+ return IPPROTO_ESP;
+ case PROTO_AH:
+ return IPPROTO_AH;
+ default:
+ return proto;
+ }
+}
+
+/**
+ * reverse of ike2kernel
+ */
+static protocol_id_t proto_kernel2ike(u_int8_t proto)
+{
+ switch (proto)
+ {
+ case IPPROTO_ESP:
+ return PROTO_ESP;
+ case IPPROTO_AH:
+ return PROTO_AH;
+ default:
+ return proto;
+ }
+}
+
+/**
+ * convert a host_t to a struct xfrm_address
+ */
+static void host2xfrm(host_t *host, xfrm_address_t *xfrm)
+{
+ chunk_t chunk = host->get_address(host);
+ memcpy(xfrm, chunk.ptr, min(chunk.len, sizeof(xfrm_address_t)));
+}
+
+/**
+ * convert a traffic selector address range to subnet and its mask.
+ */
+static void ts2subnet(traffic_selector_t* ts,
+ xfrm_address_t *net, u_int8_t *mask)
+{
+ /* there is no way to do this cleanly, as the address range may
+ * be anything else but a subnet. We use from_addr as subnet
+ * and try to calculate a usable subnet mask.
+ */
+ int byte, bit;
+ bool found = FALSE;
+ chunk_t from, to;
+ size_t size = (ts->get_type(ts) == TS_IPV4_ADDR_RANGE) ? 4 : 16;
+
+ from = ts->get_from_address(ts);
+ to = ts->get_to_address(ts);
+
+ *mask = (size * 8);
+ /* go trough all bits of the addresses, beginning in the front.
+ * as long as they are equal, the subnet gets larger
+ */
+ for (byte = 0; byte < size; byte++)
+ {
+ for (bit = 7; bit >= 0; bit--)
+ {
+ if ((1<<bit & from.ptr[byte]) != (1<<bit & to.ptr[byte]))
+ {
+ *mask = ((7 - bit) + (byte * 8));
+ found = TRUE;
+ break;
+ }
+ }
+ if (found)
+ {
+ break;
+ }
+ }
+ memcpy(net, from.ptr, from.len);
+ chunk_free(&from);
+ chunk_free(&to);
+}
+
+/**
+ * convert a traffic selector port range to port/portmask
+ */
+static void ts2ports(traffic_selector_t* ts,
+ u_int16_t *port, u_int16_t *mask)
+{
+ /* linux does not seem to accept complex portmasks. Only
+ * any or a specific port is allowed. We set to any, if we have
+ * a port range, or to a specific, if we have one port only.
+ */
+ u_int16_t from, to;
+
+ from = ts->get_from_port(ts);
+ to = ts->get_to_port(ts);
+
+ if (from == to)
+ {
+ *port = htons(from);
+ *mask = ~0;
+ }
+ else
+ {
+ *port = 0;
+ *mask = 0;
+ }
+}
+
+/**
+ * convert a pair of traffic_selectors to a xfrm_selector
+ */
+static struct xfrm_selector ts2selector(traffic_selector_t *src,
+ traffic_selector_t *dst)
+{
+ struct xfrm_selector sel;
+
+ memset(&sel, 0, sizeof(sel));
+ sel.family = (src->get_type(src) == TS_IPV4_ADDR_RANGE) ? AF_INET : AF_INET6;
+ /* src or dest proto may be "any" (0), use more restrictive one */
+ sel.proto = max(src->get_protocol(src), dst->get_protocol(dst));
+ ts2subnet(dst, &sel.daddr, &sel.prefixlen_d);
+ ts2subnet(src, &sel.saddr, &sel.prefixlen_s);
+ ts2ports(dst, &sel.dport, &sel.dport_mask);
+ ts2ports(src, &sel.sport, &sel.sport_mask);
+ sel.ifindex = 0;
+ sel.user = 0;
+
+ return sel;
+}
+
+
+/**
+ * process a XFRM_MSG_ACQUIRE from kernel
+ */
+static void process_acquire(private_kernel_netlink_ipsec_t *this, struct nlmsghdr *hdr)
+{
+ u_int32_t reqid = 0;
+ int proto = 0;
+ job_t *job;
+ struct rtattr *rtattr = XFRM_RTA(hdr, struct xfrm_user_acquire);
+ size_t rtsize = XFRM_PAYLOAD(hdr, struct xfrm_user_tmpl);
+
+ if (RTA_OK(rtattr, rtsize))
+ {
+ if (rtattr->rta_type == XFRMA_TMPL)
+ {
+ struct xfrm_user_tmpl* tmpl = (struct xfrm_user_tmpl*)RTA_DATA(rtattr);
+ reqid = tmpl->reqid;
+ proto = tmpl->id.proto;
+ }
+ }
+ switch (proto)
+ {
+ case 0:
+ case IPPROTO_ESP:
+ case IPPROTO_AH:
+ break;
+ default:
+ /* acquire for AH/ESP only, not for IPCOMP */
+ return;
+ }
+ if (reqid == 0)
+ {
+ DBG1(DBG_KNL, "received a XFRM_MSG_ACQUIRE, but no reqid found");
+ return;
+ }
+ DBG2(DBG_KNL, "received a XFRM_MSG_ACQUIRE");
+ DBG1(DBG_KNL, "creating acquire job for CHILD_SA with reqid {%d}", reqid);
+ job = (job_t*)acquire_job_create(reqid);
+ charon->processor->queue_job(charon->processor, job);
+}
+
+/**
+ * process a XFRM_MSG_EXPIRE from kernel
+ */
+static void process_expire(private_kernel_netlink_ipsec_t *this, struct nlmsghdr *hdr)
+{
+ job_t *job;
+ protocol_id_t protocol;
+ u_int32_t spi, reqid;
+ struct xfrm_user_expire *expire;
+
+ expire = (struct xfrm_user_expire*)NLMSG_DATA(hdr);
+ protocol = proto_kernel2ike(expire->state.id.proto);
+ spi = expire->state.id.spi;
+ reqid = expire->state.reqid;
+
+ DBG2(DBG_KNL, "received a XFRM_MSG_EXPIRE");
+
+ if (protocol != PROTO_ESP && protocol != PROTO_AH)
+ {
+ DBG2(DBG_KNL, "ignoring XFRM_MSG_EXPIRE for SA with SPI %.8x and reqid {%d} "
+ "which is not a CHILD_SA", ntohl(spi), reqid);
+ return;
+ }
+
+ DBG1(DBG_KNL, "creating %s job for %N CHILD_SA with SPI %.8x and reqid {%d}",
+ expire->hard ? "delete" : "rekey", protocol_id_names,
+ protocol, ntohl(spi), reqid);
+ if (expire->hard)
+ {
+ job = (job_t*)delete_child_sa_job_create(reqid, protocol, spi);
+ }
+ else
+ {
+ job = (job_t*)rekey_child_sa_job_create(reqid, protocol, spi);
+ }
+ charon->processor->queue_job(charon->processor, job);
+}
+
+/**
+ * Receives events from kernel
+ */
+static job_requeue_t receive_events(private_kernel_netlink_ipsec_t *this)
+{
+ char response[1024];
+ struct nlmsghdr *hdr = (struct nlmsghdr*)response;
+ struct sockaddr_nl addr;
+ socklen_t addr_len = sizeof(addr);
+ int len, oldstate;
+
+ pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &oldstate);
+ len = recvfrom(this->socket_xfrm_events, response, sizeof(response), 0,
+ (struct sockaddr*)&addr, &addr_len);
+ pthread_setcancelstate(oldstate, NULL);
+
+ if (len < 0)
+ {
+ switch (errno)
+ {
+ case EINTR:
+ /* interrupted, try again */
+ return JOB_REQUEUE_DIRECT;
+ case EAGAIN:
+ /* no data ready, select again */
+ return JOB_REQUEUE_DIRECT;
+ default:
+ DBG1(DBG_KNL, "unable to receive from xfrm event socket");
+ sleep(1);
+ return JOB_REQUEUE_FAIR;
+ }
+ }
+
+ if (addr.nl_pid != 0)
+ { /* not from kernel. not interested, try another one */
+ return JOB_REQUEUE_DIRECT;
+ }
+
+ while (NLMSG_OK(hdr, len))
+ {
+ switch (hdr->nlmsg_type)
+ {
+ case XFRM_MSG_ACQUIRE:
+ process_acquire(this, hdr);
+ break;
+ case XFRM_MSG_EXPIRE:
+ process_expire(this, hdr);
+ break;
+ default:
+ break;
+ }
+ hdr = NLMSG_NEXT(hdr, len);
+ }
+ return JOB_REQUEUE_DIRECT;
+}
+
+/**
+ * Tries to find an ip address of a local interface that is included in the
+ * supplied traffic selector.
+ */
+static status_t get_address_by_ts(private_kernel_netlink_ipsec_t *this,
+ traffic_selector_t *ts, host_t **ip)
+{
+ enumerator_t *addrs;
+ host_t *host;
+ int family;
+ bool found = FALSE;
+
+ DBG2(DBG_KNL, "getting a local address in traffic selector %R", ts);
+
+ /* if we have a family which includes localhost, we do not
+ * search for an IP, we use the default */
+ family = ts->get_type(ts) == TS_IPV4_ADDR_RANGE ? AF_INET : AF_INET6;
+
+ if (family == AF_INET)
+ {
+ host = host_create_from_string("127.0.0.1", 0);
+ }
+ else
+ {
+ host = host_create_from_string("::1", 0);
+ }
+
+ if (ts->includes(ts, host))
+ {
+ *ip = host_create_any(family);
+ host->destroy(host);
+ DBG2(DBG_KNL, "using host %H", *ip);
+ return SUCCESS;
+ }
+ host->destroy(host);
+
+ addrs = charon->kernel_interface->create_address_enumerator(
+ charon->kernel_interface, TRUE, TRUE);
+ while (addrs->enumerate(addrs, (void**)&host))
+ {
+ if (ts->includes(ts, host))
+ {
+ found = TRUE;
+ *ip = host->clone(host);
+ break;
+ }
+ }
+ addrs->destroy(addrs);
+
+ if (!found)
+ {
+ DBG1(DBG_KNL, "no local address found in traffic selector %R", ts);
+ return FAILED;
+ }
+ DBG2(DBG_KNL, "using host %H", *ip);
+ return SUCCESS;
+}
+
+/**
+ * Get an SPI for a specific protocol from the kernel.
+ */
+static status_t get_spi_internal(private_kernel_netlink_ipsec_t *this,
+ host_t *src, host_t *dst, u_int8_t proto, u_int32_t min, u_int32_t max,
+ u_int32_t reqid, u_int32_t *spi)
+{
+ unsigned char request[NETLINK_BUFFER_SIZE];
+ struct nlmsghdr *hdr, *out;
+ struct xfrm_userspi_info *userspi;
+ u_int32_t received_spi = 0;
+ size_t len;
+
+ memset(&request, 0, sizeof(request));
+
+ hdr = (struct nlmsghdr*)request;
+ hdr->nlmsg_flags = NLM_F_REQUEST;
+ hdr->nlmsg_type = XFRM_MSG_ALLOCSPI;
+ hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userspi_info));
+
+ userspi = (struct xfrm_userspi_info*)NLMSG_DATA(hdr);
+ host2xfrm(src, &userspi->info.saddr);
+ host2xfrm(dst, &userspi->info.id.daddr);
+ userspi->info.id.proto = proto;
+ userspi->info.mode = TRUE; /* tunnel mode */
+ userspi->info.reqid = reqid;
+ userspi->info.family = src->get_family(src);
+ userspi->min = min;
+ userspi->max = max;
+
+ if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS)
+ {
+ hdr = out;
+ while (NLMSG_OK(hdr, len))
+ {
+ switch (hdr->nlmsg_type)
+ {
+ case XFRM_MSG_NEWSA:
+ {
+ struct xfrm_usersa_info* usersa = NLMSG_DATA(hdr);
+ received_spi = usersa->id.spi;
+ break;
+ }
+ case NLMSG_ERROR:
+ {
+ struct nlmsgerr *err = NLMSG_DATA(hdr);
+
+ DBG1(DBG_KNL, "allocating SPI failed: %s (%d)",
+ strerror(-err->error), -err->error);
+ break;
+ }
+ default:
+ hdr = NLMSG_NEXT(hdr, len);
+ continue;
+ case NLMSG_DONE:
+ break;
+ }
+ break;
+ }
+ free(out);
+ }
+
+ if (received_spi == 0)
+ {
+ return FAILED;
+ }
+
+ *spi = received_spi;
+ return SUCCESS;
+}
+
+/**
+ * Implementation of kernel_interface_t.get_spi.
+ */
+static status_t get_spi(private_kernel_netlink_ipsec_t *this,
+ host_t *src, host_t *dst,
+ protocol_id_t protocol, u_int32_t reqid,
+ u_int32_t *spi)
+{
+ DBG2(DBG_KNL, "getting SPI for reqid {%d}", reqid);
+
+ if (get_spi_internal(this, src, dst, proto_ike2kernel(protocol),
+ 0xc0000000, 0xcFFFFFFF, reqid, spi) != SUCCESS)
+ {
+ DBG1(DBG_KNL, "unable to get SPI for reqid {%d}", reqid);
+ return FAILED;
+ }
+
+ DBG2(DBG_KNL, "got SPI %.8x for reqid {%d}", ntohl(*spi), reqid);
+
+ return SUCCESS;
+}
+
+/**
+ * Implementation of kernel_interface_t.get_cpi.
+ */
+static status_t get_cpi(private_kernel_netlink_ipsec_t *this,
+ host_t *src, host_t *dst,
+ u_int32_t reqid, u_int16_t *cpi)
+{
+ u_int32_t received_spi = 0;
+
+ DBG2(DBG_KNL, "getting CPI for reqid {%d}", reqid);
+
+ if (get_spi_internal(this, src, dst,
+ IPPROTO_COMP, 0x100, 0xEFFF, reqid, &received_spi) != SUCCESS)
+ {
+ DBG1(DBG_KNL, "unable to get CPI for reqid {%d}", reqid);
+ return FAILED;
+ }
+
+ *cpi = htons((u_int16_t)ntohl(received_spi));
+
+ DBG2(DBG_KNL, "got CPI %.4x for reqid {%d}", ntohs(*cpi), reqid);
+
+ return SUCCESS;
+}
+
+/**
+ * Implementation of kernel_interface_t.add_sa.
+ */
+static status_t add_sa(private_kernel_netlink_ipsec_t *this,
+ host_t *src, host_t *dst, u_int32_t spi,
+ protocol_id_t protocol, u_int32_t reqid,
+ u_int64_t expire_soft, u_int64_t expire_hard,
+ u_int16_t enc_alg, u_int16_t enc_size,
+ u_int16_t int_alg, u_int16_t int_size,
+ prf_plus_t *prf_plus, mode_t mode,
+ u_int16_t ipcomp, bool encap,
+ bool replace)
+{
+ unsigned char request[NETLINK_BUFFER_SIZE];
+ char *alg_name;
+ /* additional 4 octets KEYMAT required for AES-GCM as of RFC4106 8.1. */
+ u_int16_t add_keymat = 32;
+ struct nlmsghdr *hdr;
+ struct xfrm_usersa_info *sa;
+
+ memset(&request, 0, sizeof(request));
+
+ DBG2(DBG_KNL, "adding SAD entry with SPI %.8x and reqid {%d}", ntohl(spi), reqid);
+
+ hdr = (struct nlmsghdr*)request;
+ hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+ hdr->nlmsg_type = replace ? XFRM_MSG_UPDSA : XFRM_MSG_NEWSA;
+ hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info));
+
+ sa = (struct xfrm_usersa_info*)NLMSG_DATA(hdr);
+ host2xfrm(src, &sa->saddr);
+ host2xfrm(dst, &sa->id.daddr);
+ sa->id.spi = spi;
+ sa->id.proto = proto_ike2kernel(protocol);
+ sa->family = src->get_family(src);
+ sa->mode = mode;
+ if (mode == MODE_TUNNEL)
+ {
+ sa->flags |= XFRM_STATE_AF_UNSPEC;
+ }
+ sa->replay_window = (protocol == IPPROTO_COMP) ? 0 : 32;
+ sa->reqid = reqid;
+ /* we currently do not expire SAs by volume/packet count */
+ sa->lft.soft_byte_limit = XFRM_INF;
+ sa->lft.hard_byte_limit = XFRM_INF;
+ sa->lft.soft_packet_limit = XFRM_INF;
+ sa->lft.hard_packet_limit = XFRM_INF;
+ /* we use lifetimes since added, not since used */
+ sa->lft.soft_add_expires_seconds = expire_soft;
+ sa->lft.hard_add_expires_seconds = expire_hard;
+ sa->lft.soft_use_expires_seconds = 0;
+ sa->lft.hard_use_expires_seconds = 0;
+
+ struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_usersa_info);
+
+ switch (enc_alg)
+ {
+ case ENCR_UNDEFINED:
+ /* no encryption */
+ break;
+ case ENCR_AES_CCM_ICV8:
+ case ENCR_AES_CCM_ICV12:
+ case ENCR_AES_CCM_ICV16:
+ /* AES-CCM needs only 3 additional octets KEYMAT as of RFC 4309 7.1. */
+ add_keymat = 24;
+ /* fall-through */
+ case ENCR_AES_GCM_ICV8:
+ case ENCR_AES_GCM_ICV12:
+ case ENCR_AES_GCM_ICV16:
+ {
+ u_int16_t icv_size = 0;
+ rthdr->rta_type = XFRMA_ALG_AEAD;
+ alg_name = lookup_algorithm(encryption_algs, enc_alg, &icv_size);
+ if (alg_name == NULL)
+ {
+ DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
+ encryption_algorithm_names, enc_alg);
+ return FAILED;
+ }
+ DBG2(DBG_KNL, " using encryption algorithm %N with key size %d",
+ encryption_algorithm_names, enc_alg, enc_size);
+
+ /* additional KEYMAT required */
+ enc_size += add_keymat;
+
+ rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo_aead) + enc_size / 8);
+ hdr->nlmsg_len += rthdr->rta_len;
+ if (hdr->nlmsg_len > sizeof(request))
+ {
+ return FAILED;
+ }
+
+ struct xfrm_algo_aead* algo = (struct xfrm_algo_aead*)RTA_DATA(rthdr);
+ algo->alg_key_len = enc_size;
+ algo->alg_icv_len = icv_size;
+ strcpy(algo->alg_name, alg_name);
+ prf_plus->get_bytes(prf_plus, enc_size / 8, algo->alg_key);
+
+ rthdr = XFRM_RTA_NEXT(rthdr);
+ break;
+ }
+ default:
+ {
+ rthdr->rta_type = XFRMA_ALG_CRYPT;
+ alg_name = lookup_algorithm(encryption_algs, enc_alg, &enc_size);
+ if (alg_name == NULL)
+ {
+ DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
+ encryption_algorithm_names, enc_alg);
+ return FAILED;
+ }
+ DBG2(DBG_KNL, " using encryption algorithm %N with key size %d",
+ encryption_algorithm_names, enc_alg, enc_size);
+
+ rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + enc_size / 8);
+ hdr->nlmsg_len += rthdr->rta_len;
+ if (hdr->nlmsg_len > sizeof(request))
+ {
+ return FAILED;
+ }
+
+ struct xfrm_algo* algo = (struct xfrm_algo*)RTA_DATA(rthdr);
+ algo->alg_key_len = enc_size;
+ strcpy(algo->alg_name, alg_name);
+ prf_plus->get_bytes(prf_plus, enc_size / 8, algo->alg_key);
+
+ rthdr = XFRM_RTA_NEXT(rthdr);
+ break;
+ }
+ }
+
+ if (int_alg != AUTH_UNDEFINED)
+ {
+ rthdr->rta_type = XFRMA_ALG_AUTH;
+ alg_name = lookup_algorithm(integrity_algs, int_alg, &int_size);
+ if (alg_name == NULL)
+ {
+ DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
+ integrity_algorithm_names, int_alg);
+ return FAILED;
+ }
+ DBG2(DBG_KNL, " using integrity algorithm %N with key size %d",
+ integrity_algorithm_names, int_alg, int_size);
+
+ rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + int_size / 8);
+ hdr->nlmsg_len += rthdr->rta_len;
+ if (hdr->nlmsg_len > sizeof(request))
+ {
+ return FAILED;
+ }
+
+ struct xfrm_algo* algo = (struct xfrm_algo*)RTA_DATA(rthdr);
+ algo->alg_key_len = int_size;
+ strcpy(algo->alg_name, alg_name);
+ prf_plus->get_bytes(prf_plus, int_size / 8, algo->alg_key);
+
+ rthdr = XFRM_RTA_NEXT(rthdr);
+ }
+
+ if (ipcomp != IPCOMP_NONE)
+ {
+ rthdr->rta_type = XFRMA_ALG_COMP;
+ alg_name = lookup_algorithm(compression_algs, ipcomp, NULL);
+ if (alg_name == NULL)
+ {
+ DBG1(DBG_KNL, "algorithm %N not supported by kernel!",
+ ipcomp_transform_names, ipcomp);
+ return FAILED;
+ }
+ DBG2(DBG_KNL, " using compression algorithm %N",
+ ipcomp_transform_names, ipcomp);
+
+ rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo));
+ hdr->nlmsg_len += rthdr->rta_len;
+ if (hdr->nlmsg_len > sizeof(request))
+ {
+ return FAILED;
+ }
+
+ struct xfrm_algo* algo = (struct xfrm_algo*)RTA_DATA(rthdr);
+ algo->alg_key_len = 0;
+ strcpy(algo->alg_name, alg_name);
+
+ rthdr = XFRM_RTA_NEXT(rthdr);
+ }
+
+ if (encap)
+ {
+ rthdr->rta_type = XFRMA_ENCAP;
+ rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_encap_tmpl));
+
+ hdr->nlmsg_len += rthdr->rta_len;
+ if (hdr->nlmsg_len > sizeof(request))
+ {
+ return FAILED;
+ }
+
+ struct xfrm_encap_tmpl* tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rthdr);
+ tmpl->encap_type = UDP_ENCAP_ESPINUDP;
+ tmpl->encap_sport = htons(src->get_port(src));
+ tmpl->encap_dport = htons(dst->get_port(dst));
+ memset(&tmpl->encap_oa, 0, sizeof (xfrm_address_t));
+ /* encap_oa could probably be derived from the
+ * traffic selectors [rfc4306, p39]. In the netlink kernel implementation
+ * pluto does the same as we do here but it uses encap_oa in the
+ * pfkey implementation. BUT as /usr/src/linux/net/key/af_key.c indicates
+ * the kernel ignores it anyway
+ * -> does that mean that NAT-T encap doesn't work in transport mode?
+ * No. The reason the kernel ignores NAT-OA is that it recomputes
+ * (or, rather, just ignores) the checksum. If packets pass
+ * the IPsec checks it marks them "checksum ok" so OA isn't needed. */
+ rthdr = XFRM_RTA_NEXT(rthdr);
+ }
+
+ if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
+ {
+ DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x", ntohl(spi));
+ return FAILED;
+ }
+ return SUCCESS;
+}
+
+/**
+ * Get the replay state (i.e. sequence numbers) of an SA.
+ */
+static status_t get_replay_state(private_kernel_netlink_ipsec_t *this,
+ u_int32_t spi, protocol_id_t protocol, host_t *dst,
+ struct xfrm_replay_state *replay)
+{
+ unsigned char request[NETLINK_BUFFER_SIZE];
+ struct nlmsghdr *hdr, *out = NULL;
+ struct xfrm_aevent_id *out_aevent = NULL, *aevent_id;
+ size_t len;
+ struct rtattr *rta;
+ size_t rtasize;
+
+ memset(&request, 0, sizeof(request));
+
+ DBG2(DBG_KNL, "querying replay state from SAD entry with SPI %.8x", ntohl(spi));
+
+ hdr = (struct nlmsghdr*)request;
+ hdr->nlmsg_flags = NLM_F_REQUEST;
+ hdr->nlmsg_type = XFRM_MSG_GETAE;
+ hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
+
+ aevent_id = (struct xfrm_aevent_id*)NLMSG_DATA(hdr);
+ aevent_id->flags = XFRM_AE_RVAL;
+
+ host2xfrm(dst, &aevent_id->sa_id.daddr);
+ aevent_id->sa_id.spi = spi;
+ aevent_id->sa_id.proto = proto_ike2kernel(protocol);
+ aevent_id->sa_id.family = dst->get_family(dst);
+
+ if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS)
+ {
+ hdr = out;
+ while (NLMSG_OK(hdr, len))
+ {
+ switch (hdr->nlmsg_type)
+ {
+ case XFRM_MSG_NEWAE:
+ {
+ out_aevent = NLMSG_DATA(hdr);
+ break;
+ }
+ case NLMSG_ERROR:
+ {
+ struct nlmsgerr *err = NLMSG_DATA(hdr);
+ DBG1(DBG_KNL, "querying replay state from SAD entry failed: %s (%d)",
+ strerror(-err->error), -err->error);
+ break;
+ }
+ default:
+ hdr = NLMSG_NEXT(hdr, len);
+ continue;
+ case NLMSG_DONE:
+ break;
+ }
+ break;
+ }
+ }
+
+ if (out_aevent == NULL)
+ {
+ DBG1(DBG_KNL, "unable to query replay state from SAD entry with SPI %.8x",
+ ntohl(spi));
+ free(out);
+ return FAILED;
+ }
+
+ rta = XFRM_RTA(out, struct xfrm_aevent_id);
+ rtasize = XFRM_PAYLOAD(out, struct xfrm_aevent_id);
+ while(RTA_OK(rta, rtasize))
+ {
+ if (rta->rta_type == XFRMA_REPLAY_VAL)
+ {
+ memcpy(replay, RTA_DATA(rta), rta->rta_len);
+ free(out);
+ return SUCCESS;
+ }
+ rta = RTA_NEXT(rta, rtasize);
+ }
+
+ DBG1(DBG_KNL, "unable to query replay state from SAD entry with SPI %.8x",
+ ntohl(spi));
+ free(out);
+ return FAILED;
+}
+
+/**
+ * Implementation of kernel_interface_t.update_sa.
+ */
+static status_t update_sa(private_kernel_netlink_ipsec_t *this,
+ u_int32_t spi, protocol_id_t protocol,
+ host_t *src, host_t *dst,
+ host_t *new_src, host_t *new_dst, bool encap)
+{
+ unsigned char request[NETLINK_BUFFER_SIZE], *pos;
+ struct nlmsghdr *hdr, *out = NULL;
+ struct xfrm_usersa_id *sa_id;
+ struct xfrm_usersa_info *out_sa = NULL, *sa;
+ size_t len;
+ struct rtattr *rta;
+ size_t rtasize;
+ struct xfrm_encap_tmpl* tmpl = NULL;
+ bool got_replay_state;
+ struct xfrm_replay_state replay;
+
+ memset(&request, 0, sizeof(request));
+
+ DBG2(DBG_KNL, "querying SAD entry with SPI %.8x for update", ntohl(spi));
+
+ /* query the existing SA first */
+ hdr = (struct nlmsghdr*)request;
+ hdr->nlmsg_flags = NLM_F_REQUEST;
+ hdr->nlmsg_type = XFRM_MSG_GETSA;
+ hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id));
+
+ sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr);
+ host2xfrm(dst, &sa_id->daddr);
+ sa_id->spi = spi;
+ sa_id->proto = proto_ike2kernel(protocol);
+ sa_id->family = dst->get_family(dst);
+
+ if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS)
+ {
+ hdr = out;
+ while (NLMSG_OK(hdr, len))
+ {
+ switch (hdr->nlmsg_type)
+ {
+ case XFRM_MSG_NEWSA:
+ {
+ out_sa = NLMSG_DATA(hdr);
+ break;
+ }
+ case NLMSG_ERROR:
+ {
+ struct nlmsgerr *err = NLMSG_DATA(hdr);
+ DBG1(DBG_KNL, "querying SAD entry failed: %s (%d)",
+ strerror(-err->error), -err->error);
+ break;
+ }
+ default:
+ hdr = NLMSG_NEXT(hdr, len);
+ continue;
+ case NLMSG_DONE:
+ break;
+ }
+ break;
+ }
+ }
+ if (out_sa == NULL)
+ {
+ DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(spi));
+ free(out);
+ return FAILED;
+ }
+
+ /* try to get the replay state */
+ got_replay_state = (get_replay_state(
+ this, spi, protocol, dst, &replay) == SUCCESS);
+
+ /* delete the old SA */
+ if (this->public.interface.del_sa(&this->public.interface, dst, spi, protocol) != SUCCESS)
+ {
+ DBG1(DBG_KNL, "unable to delete old SAD entry with SPI %.8x", ntohl(spi));
+ free(out);
+ return FAILED;
+ }
+
+ DBG2(DBG_KNL, "updating SAD entry with SPI %.8x from %#H..%#H to %#H..%#H",
+ ntohl(spi), src, dst, new_src, new_dst);
+
+ /* copy over the SA from out to request */
+ hdr = (struct nlmsghdr*)request;
+ memcpy(hdr, out, min(out->nlmsg_len, sizeof(request)));
+ hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+ hdr->nlmsg_type = XFRM_MSG_NEWSA;
+ hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info));
+ sa = NLMSG_DATA(hdr);
+ sa->family = new_dst->get_family(new_dst);
+
+ if (!src->ip_equals(src, new_src))
+ {
+ host2xfrm(new_src, &sa->saddr);
+ }
+ if (!dst->ip_equals(dst, new_dst))
+ {
+ host2xfrm(new_dst, &sa->id.daddr);
+ }
+
+ rta = XFRM_RTA(out, struct xfrm_usersa_info);
+ rtasize = XFRM_PAYLOAD(out, struct xfrm_usersa_info);
+ pos = (u_char*)XFRM_RTA(hdr, struct xfrm_usersa_info);
+ while(RTA_OK(rta, rtasize))
+ {
+ /* copy all attributes, but not XFRMA_ENCAP if we are disabling it */
+ if (rta->rta_type != XFRMA_ENCAP || encap)
+ {
+ if (rta->rta_type == XFRMA_ENCAP)
+ { /* update encap tmpl */
+ tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rta);
+ tmpl->encap_sport = ntohs(new_src->get_port(new_src));
+ tmpl->encap_dport = ntohs(new_dst->get_port(new_dst));
+ }
+ memcpy(pos, rta, rta->rta_len);
+ pos += RTA_ALIGN(rta->rta_len);
+ hdr->nlmsg_len += RTA_ALIGN(rta->rta_len);
+ }
+ rta = RTA_NEXT(rta, rtasize);
+ }
+
+ rta = (struct rtattr*)pos;
+ if (tmpl == NULL && encap)
+ { /* add tmpl if we are enabling it */
+ rta->rta_type = XFRMA_ENCAP;
+ rta->rta_len = RTA_LENGTH(sizeof(struct xfrm_encap_tmpl));
+
+ hdr->nlmsg_len += rta->rta_len;
+ if (hdr->nlmsg_len > sizeof(request))
+ {
+ return FAILED;
+ }
+
+ tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rta);
+ tmpl->encap_type = UDP_ENCAP_ESPINUDP;
+ tmpl->encap_sport = ntohs(new_src->get_port(new_src));
+ tmpl->encap_dport = ntohs(new_dst->get_port(new_dst));
+ memset(&tmpl->encap_oa, 0, sizeof (xfrm_address_t));
+
+ rta = XFRM_RTA_NEXT(rta);
+ }
+
+ if (got_replay_state)
+ { /* copy the replay data if available */
+ rta->rta_type = XFRMA_REPLAY_VAL;
+ rta->rta_len = RTA_LENGTH(sizeof(struct xfrm_replay_state));
+
+ hdr->nlmsg_len += rta->rta_len;
+ if (hdr->nlmsg_len > sizeof(request))
+ {
+ return FAILED;
+ }
+ memcpy(RTA_DATA(rta), &replay, sizeof(replay));
+
+ rta = XFRM_RTA_NEXT(rta);
+ }
+
+ if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
+ {
+ DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(spi));
+ free(out);
+ return FAILED;
+ }
+ free(out);
+
+ return SUCCESS;
+}
+
+/**
+ * Implementation of kernel_interface_t.query_sa.
+ */
+static status_t query_sa(private_kernel_netlink_ipsec_t *this, host_t *dst,
+ u_int32_t spi, protocol_id_t protocol,
+ u_int32_t *use_time)
+{
+ unsigned char request[NETLINK_BUFFER_SIZE];
+ struct nlmsghdr *out = NULL, *hdr;
+ struct xfrm_usersa_id *sa_id;
+ struct xfrm_usersa_info *sa = NULL;
+ size_t len;
+
+ DBG2(DBG_KNL, "querying SAD entry with SPI %.8x", ntohl(spi));
+ memset(&request, 0, sizeof(request));
+
+ hdr = (struct nlmsghdr*)request;
+ hdr->nlmsg_flags = NLM_F_REQUEST;
+ hdr->nlmsg_type = XFRM_MSG_GETSA;
+ hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info));
+
+ sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr);
+ host2xfrm(dst, &sa_id->daddr);
+ sa_id->spi = spi;
+ sa_id->proto = proto_ike2kernel(protocol);
+ sa_id->family = dst->get_family(dst);
+
+ if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS)
+ {
+ hdr = out;
+ while (NLMSG_OK(hdr, len))
+ {
+ switch (hdr->nlmsg_type)
+ {
+ case XFRM_MSG_NEWSA:
+ {
+ sa = NLMSG_DATA(hdr);
+ break;
+ }
+ case NLMSG_ERROR:
+ {
+ struct nlmsgerr *err = NLMSG_DATA(hdr);
+ DBG1(DBG_KNL, "querying SAD entry failed: %s (%d)",
+ strerror(-err->error), -err->error);
+ break;
+ }
+ default:
+ hdr = NLMSG_NEXT(hdr, len);
+ continue;
+ case NLMSG_DONE:
+ break;
+ }
+ break;
+ }
+ }
+
+ if (sa == NULL)
+ {
+ DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi));
+ free(out);
+ return FAILED;
+ }
+
+ *use_time = sa->curlft.use_time;
+ free (out);
+ return SUCCESS;
+}
+
+/**
+ * Implementation of kernel_interface_t.del_sa.
+ */
+static status_t del_sa(private_kernel_netlink_ipsec_t *this, host_t *dst,
+ u_int32_t spi, protocol_id_t protocol)
+{
+ unsigned char request[NETLINK_BUFFER_SIZE];
+ struct nlmsghdr *hdr;
+ struct xfrm_usersa_id *sa_id;
+
+ memset(&request, 0, sizeof(request));
+
+ DBG2(DBG_KNL, "deleting SAD entry with SPI %.8x", ntohl(spi));
+
+ hdr = (struct nlmsghdr*)request;
+ hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+ hdr->nlmsg_type = XFRM_MSG_DELSA;
+ hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id));
+
+ sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr);
+ host2xfrm(dst, &sa_id->daddr);
+ sa_id->spi = spi;
+ sa_id->proto = proto_ike2kernel(protocol);
+ sa_id->family = dst->get_family(dst);
+
+ if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
+ {
+ DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x", ntohl(spi));
+ return FAILED;
+ }
+ DBG2(DBG_KNL, "deleted SAD entry with SPI %.8x", ntohl(spi));
+ return SUCCESS;
+}
+
+/**
+ * Implementation of kernel_interface_t.add_policy.
+ */
+static status_t add_policy(private_kernel_netlink_ipsec_t *this,
+ host_t *src, host_t *dst,
+ traffic_selector_t *src_ts,
+ traffic_selector_t *dst_ts,
+ policy_dir_t direction, protocol_id_t protocol,
+ u_int32_t reqid, bool high_prio, mode_t mode,
+ u_int16_t ipcomp)
+{
+ iterator_t *iterator;
+ policy_entry_t *current, *policy;
+ bool found = FALSE;
+ unsigned char request[NETLINK_BUFFER_SIZE];
+ struct xfrm_userpolicy_info *policy_info;
+ struct nlmsghdr *hdr;
+
+ /* create a policy */
+ policy = malloc_thing(policy_entry_t);
+ memset(policy, 0, sizeof(policy_entry_t));
+ policy->sel = ts2selector(src_ts, dst_ts);
+ policy->direction = direction;
+
+ /* find the policy, which matches EXACTLY */
+ pthread_mutex_lock(&this->mutex);
+ iterator = this->policies->create_iterator(this->policies, TRUE);
+ while (iterator->iterate(iterator, (void**)¤t))
+ {
+ if (memeq(¤t->sel, &policy->sel, sizeof(struct xfrm_selector)) &&
+ policy->direction == current->direction)
+ {
+ /* use existing policy */
+ current->refcount++;
+ DBG2(DBG_KNL, "policy %R === %R %N already exists, increasing "
+ "refcount", src_ts, dst_ts,
+ policy_dir_names, direction);
+ free(policy);
+ policy = current;
+ found = TRUE;
+ break;
+ }
+ }
+ iterator->destroy(iterator);
+ if (!found)
+ { /* apply the new one, if we have no such policy */
+ this->policies->insert_last(this->policies, policy);
+ policy->refcount = 1;
+ }
+
+ DBG2(DBG_KNL, "adding policy %R === %R %N", src_ts, dst_ts,
+ policy_dir_names, direction);
+
+ memset(&request, 0, sizeof(request));
+ hdr = (struct nlmsghdr*)request;
+ hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+ hdr->nlmsg_type = found ? XFRM_MSG_UPDPOLICY : XFRM_MSG_NEWPOLICY;
+ hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_info));
+
+ policy_info = (struct xfrm_userpolicy_info*)NLMSG_DATA(hdr);
+ policy_info->sel = policy->sel;
+ policy_info->dir = policy->direction;
+ /* calculate priority based on source selector size, small size = high prio */
+ policy_info->priority = high_prio ? PRIO_HIGH : PRIO_LOW;
+ policy_info->priority -= policy->sel.prefixlen_s * 10;
+ policy_info->priority -= policy->sel.proto ? 2 : 0;
+ policy_info->priority -= policy->sel.sport_mask ? 1 : 0;
+ policy_info->action = XFRM_POLICY_ALLOW;
+ policy_info->share = XFRM_SHARE_ANY;
+ pthread_mutex_unlock(&this->mutex);
+
+ /* policies don't expire */
+ policy_info->lft.soft_byte_limit = XFRM_INF;
+ policy_info->lft.soft_packet_limit = XFRM_INF;
+ policy_info->lft.hard_byte_limit = XFRM_INF;
+ policy_info->lft.hard_packet_limit = XFRM_INF;
+ policy_info->lft.soft_add_expires_seconds = 0;
+ policy_info->lft.hard_add_expires_seconds = 0;
+ policy_info->lft.soft_use_expires_seconds = 0;
+ policy_info->lft.hard_use_expires_seconds = 0;
+
+ struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_userpolicy_info);
+ rthdr->rta_type = XFRMA_TMPL;
+ rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_user_tmpl));
+
+ hdr->nlmsg_len += rthdr->rta_len;
+ if (hdr->nlmsg_len > sizeof(request))
+ {
+ return FAILED;
+ }
+
+ struct xfrm_user_tmpl *tmpl = (struct xfrm_user_tmpl*)RTA_DATA(rthdr);
+
+ if (ipcomp != IPCOMP_NONE)
+ {
+ tmpl->reqid = reqid;
+ tmpl->id.proto = IPPROTO_COMP;
+ tmpl->aalgos = tmpl->ealgos = tmpl->calgos = ~0;
+ tmpl->mode = mode;
+ tmpl->optional = direction != POLICY_OUT;
+ tmpl->family = src->get_family(src);
+
+ host2xfrm(src, &tmpl->saddr);
+ host2xfrm(dst, &tmpl->id.daddr);
+
+ /* add an additional xfrm_user_tmpl */
+ rthdr->rta_len += RTA_LENGTH(sizeof(struct xfrm_user_tmpl));
+ hdr->nlmsg_len += RTA_LENGTH(sizeof(struct xfrm_user_tmpl));
+ if (hdr->nlmsg_len > sizeof(request))
+ {
+ return FAILED;
+ }
+
+ tmpl++;
+ }
+
+ tmpl->reqid = reqid;
+ tmpl->id.proto = proto_ike2kernel(protocol);
+ tmpl->aalgos = tmpl->ealgos = tmpl->calgos = ~0;
+ tmpl->mode = mode;
+ tmpl->family = src->get_family(src);
+
+ host2xfrm(src, &tmpl->saddr);
+ host2xfrm(dst, &tmpl->id.daddr);
+
+ if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
+ {
+ DBG1(DBG_KNL, "unable to add policy %R === %R %N", src_ts, dst_ts,
+ policy_dir_names, direction);
+ return FAILED;
+ }
+
+ /* install a route, if:
+ * - we are NOT updating a policy
+ * - this is a forward policy (to just get one for each child)
+ * - we are in tunnel mode
+ * - we are not using IPv6 (does not work correctly yet!)
+ * - routing is not disabled via strongswan.conf
+ */
+ if (policy->route == NULL && direction == POLICY_FWD &&
+ mode != MODE_TRANSPORT && src->get_family(src) != AF_INET6 &&
+ this->install_routes)
+ {
+ route_entry_t *route = malloc_thing(route_entry_t);
+
+ if (get_address_by_ts(this, dst_ts, &route->src_ip) == SUCCESS)
+ {
+ /* get the nexthop to src (src as we are in POLICY_FWD).*/
+ route->gateway = charon->kernel_interface->get_nexthop(
+ charon->kernel_interface, src);
+ route->if_name = charon->kernel_interface->get_interface(
+ charon->kernel_interface, dst);
+ route->dst_net = chunk_alloc(policy->sel.family == AF_INET ? 4 : 16);
+ memcpy(route->dst_net.ptr, &policy->sel.saddr, route->dst_net.len);
+ route->prefixlen = policy->sel.prefixlen_s;
+
+ switch (charon->kernel_interface->add_route(charon->kernel_interface,
+ route->dst_net, route->prefixlen, route->gateway,
+ route->src_ip, route->if_name))
+ {
+ default:
+ DBG1(DBG_KNL, "unable to install source route for %H",
+ route->src_ip);
+ /* FALL */
+ case ALREADY_DONE:
+ /* route exists, do not uninstall */
+ route_entry_destroy(route);
+ break;
+ case SUCCESS:
+ /* cache the installed route */
+ policy->route = route;
+ break;
+ }
+ }
+ else
+ {
+ free(route);
+ }
+ }
+
+ return SUCCESS;
+}
+
+/**
+ * Implementation of kernel_interface_t.query_policy.
+ */
+static status_t query_policy(private_kernel_netlink_ipsec_t *this,
+ traffic_selector_t *src_ts,
+ traffic_selector_t *dst_ts,
+ policy_dir_t direction, u_int32_t *use_time)
+{
+ unsigned char request[NETLINK_BUFFER_SIZE];
+ struct nlmsghdr *out = NULL, *hdr;
+ struct xfrm_userpolicy_id *policy_id;
+ struct xfrm_userpolicy_info *policy = NULL;
+ size_t len;
+
+ memset(&request, 0, sizeof(request));
+
+ DBG2(DBG_KNL, "querying policy %R === %R %N", src_ts, dst_ts,
+ policy_dir_names, direction);
+
+ hdr = (struct nlmsghdr*)request;
+ hdr->nlmsg_flags = NLM_F_REQUEST;
+ hdr->nlmsg_type = XFRM_MSG_GETPOLICY;
+ hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id));
+
+ policy_id = (struct xfrm_userpolicy_id*)NLMSG_DATA(hdr);
+ policy_id->sel = ts2selector(src_ts, dst_ts);
+ policy_id->dir = direction;
+
+ if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS)
+ {
+ hdr = out;
+ while (NLMSG_OK(hdr, len))
+ {
+ switch (hdr->nlmsg_type)
+ {
+ case XFRM_MSG_NEWPOLICY:
+ {
+ policy = (struct xfrm_userpolicy_info*)NLMSG_DATA(hdr);
+ break;
+ }
+ case NLMSG_ERROR:
+ {
+ struct nlmsgerr *err = NLMSG_DATA(hdr);
+ DBG1(DBG_KNL, "querying policy failed: %s (%d)",
+ strerror(-err->error), -err->error);
+ break;
+ }
+ default:
+ hdr = NLMSG_NEXT(hdr, len);
+ continue;
+ case NLMSG_DONE:
+ break;
+ }
+ break;
+ }
+ }
+
+ if (policy == NULL)
+ {
+ DBG2(DBG_KNL, "unable to query policy %R === %R %N", src_ts, dst_ts,
+ policy_dir_names, direction);
+ free(out);
+ return FAILED;
+ }
+ *use_time = (time_t)policy->curlft.use_time;
+
+ free(out);
+ return SUCCESS;
+}
+
+/**
+ * Implementation of kernel_interface_t.del_policy.
+ */
+static status_t del_policy(private_kernel_netlink_ipsec_t *this,
+ traffic_selector_t *src_ts,
+ traffic_selector_t *dst_ts,
+ policy_dir_t direction)
+{
+ policy_entry_t *current, policy, *to_delete = NULL;
+ route_entry_t *route;
+ unsigned char request[NETLINK_BUFFER_SIZE];
+ struct nlmsghdr *hdr;
+ struct xfrm_userpolicy_id *policy_id;
+ iterator_t *iterator;
+
+ DBG2(DBG_KNL, "deleting policy %R === %R %N", src_ts, dst_ts,
+ policy_dir_names, direction);
+
+ /* create a policy */
+ memset(&policy, 0, sizeof(policy_entry_t));
+ policy.sel = ts2selector(src_ts, dst_ts);
+ policy.direction = direction;
+
+ /* find the policy */
+ iterator = this->policies->create_iterator_locked(this->policies, &this->mutex);
+ while (iterator->iterate(iterator, (void**)¤t))
+ {
+ if (memcmp(¤t->sel, &policy.sel, sizeof(struct xfrm_selector)) == 0 &&
+ policy.direction == current->direction)
+ {
+ to_delete = current;
+ if (--to_delete->refcount > 0)
+ {
+ /* is used by more SAs, keep in kernel */
+ DBG2(DBG_KNL, "policy still used by another CHILD_SA, not removed");
+ iterator->destroy(iterator);
+ return SUCCESS;
+ }
+ /* remove if last reference */
+ iterator->remove(iterator);
+ break;
+ }
+ }
+ iterator->destroy(iterator);
+ if (!to_delete)
+ {
+ DBG1(DBG_KNL, "deleting policy %R === %R %N failed, not found", src_ts,
+ dst_ts, policy_dir_names, direction);
+ return NOT_FOUND;
+ }
+
+ memset(&request, 0, sizeof(request));
+
+ hdr = (struct nlmsghdr*)request;
+ hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+ hdr->nlmsg_type = XFRM_MSG_DELPOLICY;
+ hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id));
+
+ policy_id = (struct xfrm_userpolicy_id*)NLMSG_DATA(hdr);
+ policy_id->sel = to_delete->sel;
+ policy_id->dir = direction;
+
+ route = to_delete->route;
+ free(to_delete);
+
+ if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS)
+ {
+ DBG1(DBG_KNL, "unable to delete policy %R === %R %N", src_ts, dst_ts,
+ policy_dir_names, direction);
+ return FAILED;
+ }
+
+ if (route)
+ {
+ if (charon->kernel_interface->del_route(charon->kernel_interface,
+ route->dst_net, route->prefixlen, route->gateway,
+ route->src_ip, route->if_name) != SUCCESS)
+ {
+ DBG1(DBG_KNL, "error uninstalling route installed with "
+ "policy %R === %R %N", src_ts, dst_ts,
+ policy_dir_names, direction);
+ }
+ route_entry_destroy(route);
+ }
+ return SUCCESS;
+}
+
+/**
+ * Implementation of kernel_interface_t.destroy.
+ */
+static void destroy(private_kernel_netlink_ipsec_t *this)
+{
+ this->job->cancel(this->job);
+ close(this->socket_xfrm_events);
+ this->socket_xfrm->destroy(this->socket_xfrm);
+ this->policies->destroy(this->policies);
+ free(this);
+}
+
+/*
+ * Described in header.
+ */
+kernel_netlink_ipsec_t *kernel_netlink_ipsec_create()
+{
+ private_kernel_netlink_ipsec_t *this = malloc_thing(private_kernel_netlink_ipsec_t);
+ struct sockaddr_nl addr;
+
+ /* public functions */
+ this->public.interface.get_spi = (status_t(*)(kernel_ipsec_t*,host_t*,host_t*,protocol_id_t,u_int32_t,u_int32_t*))get_spi;
+ this->public.interface.get_cpi = (status_t(*)(kernel_ipsec_t*,host_t*,host_t*,u_int32_t,u_int16_t*))get_cpi;
+ this->public.interface.add_sa = (status_t(*)(kernel_ipsec_t *,host_t*,host_t*,u_int32_t,protocol_id_t,u_int32_t,u_int64_t,u_int64_t,u_int16_t,u_int16_t,u_int16_t,u_int16_t,prf_plus_t*,mode_t,u_int16_t,bool,bool))add_sa;
+ this->public.interface.update_sa = (status_t(*)(kernel_ipsec_t*,u_int32_t,protocol_id_t,host_t*,host_t*,host_t*,host_t*,bool))update_sa;
+ this->public.interface.query_sa = (status_t(*)(kernel_ipsec_t*,host_t*,u_int32_t,protocol_id_t,u_int32_t*))query_sa;
+ this->public.interface.del_sa = (status_t(*)(kernel_ipsec_t*,host_t*,u_int32_t,protocol_id_t))del_sa;
+ this->public.interface.add_policy = (status_t(*)(kernel_ipsec_t*,host_t*,host_t*,traffic_selector_t*,traffic_selector_t*,policy_dir_t,protocol_id_t,u_int32_t,bool,mode_t,u_int16_t))add_policy;
+ this->public.interface.query_policy = (status_t(*)(kernel_ipsec_t*,traffic_selector_t*,traffic_selector_t*,policy_dir_t,u_int32_t*))query_policy;
+ this->public.interface.del_policy = (status_t(*)(kernel_ipsec_t*,traffic_selector_t*,traffic_selector_t*,policy_dir_t))del_policy;
+ this->public.interface.destroy = (void(*)(kernel_ipsec_t*)) destroy;
+
+ /* private members */
+ this->policies = linked_list_create();
+ pthread_mutex_init(&this->mutex, NULL);
+ this->install_routes = lib->settings->get_bool(lib->settings,
+ "charon.install_routes", TRUE);
+
+ this->socket_xfrm = netlink_socket_create(NETLINK_XFRM);
+
+ memset(&addr, 0, sizeof(addr));
+ addr.nl_family = AF_NETLINK;
+
+ /* create and bind XFRM socket for ACQUIRE & EXPIRE */
+ this->socket_xfrm_events = socket(AF_NETLINK, SOCK_RAW, NETLINK_XFRM);
+ if (this->socket_xfrm_events <= 0)
+ {
+ charon->kill(charon, "unable to create XFRM event socket");
+ }
+ addr.nl_groups = XFRMGRP_ACQUIRE | XFRMGRP_EXPIRE;
+ if (bind(this->socket_xfrm_events, (struct sockaddr*)&addr, sizeof(addr)))
+ {
+ charon->kill(charon, "unable to bind XFRM event socket");
+ }
+
+ this->job = callback_job_create((callback_job_cb_t)receive_events,
+ this, NULL, NULL);
+ charon->processor->queue_job(charon->processor, (job_t*)this->job);
+
+ return &this->public;
+}
--- /dev/null
+/*
+ * Copyright (C) 2008 Tobias Brunner
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * $Id$
+ */
+
+/**
+ * @defgroup kernel_netlink_ipsec_i kernel_netlink_ipsec
+ * @{ @ingroup kernel_netlink
+ */
+
+#ifndef KERNEL_NETLINK_IPSEC_H_
+#define KERNEL_NETLINK_IPSEC_H_
+
+#include <kernel/kernel_ipsec.h>
+
+typedef struct kernel_netlink_ipsec_t kernel_netlink_ipsec_t;
+
+/**
+ * Implementation of the kernel ipsec interface using Netlink.
+ */
+struct kernel_netlink_ipsec_t {
+
+ /**
+ * Implements kernel_ipsec_t interface
+ */
+ kernel_ipsec_t interface;
+};
+
+/**
+ * Create a netlink kernel ipsec interface instance.
+ *
+ * @return kernel_netlink_ipsec_t instance
+ */
+kernel_netlink_ipsec_t *kernel_netlink_ipsec_create();
+
+#endif /* KERNEL_NETLINK_IPSEC_H_ */
--- /dev/null
+/*
+ * Copyright (C) 2008 Tobias Brunner
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * $Id$
+ */
+
+#include <sys/socket.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <sys/time.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <errno.h>
+#include <net/if.h>
+
+#include "kernel_netlink_net.h"
+#include "kernel_netlink_shared.h"
+
+#include <daemon.h>
+#include <utils/linked_list.h>
+#include <processing/jobs/callback_job.h>
+#include <processing/jobs/roam_job.h>
+
+/** delay before firing roam jobs (ms) */
+#define ROAM_DELAY 100
+
+/** routing table for routes installed by us */
+#ifndef IPSEC_ROUTING_TABLE
+#define IPSEC_ROUTING_TABLE 100
+#endif
+#ifndef IPSEC_ROUTING_TABLE_PRIO
+#define IPSEC_ROUTING_TABLE_PRIO 100
+#endif
+
+typedef struct addr_entry_t addr_entry_t;
+
+/**
+ * IP address in an inface_entry_t
+ */
+struct addr_entry_t {
+
+ /** The ip address */
+ host_t *ip;
+
+ /** virtual IP managed by us */
+ bool virtual;
+
+ /** scope of the address */
+ u_char scope;
+
+ /** Number of times this IP is used, if virtual */
+ u_int refcount;
+};
+
+/**
+ * destroy a addr_entry_t object
+ */
+static void addr_entry_destroy(addr_entry_t *this)
+{
+ this->ip->destroy(this->ip);
+ free(this);
+}
+
+typedef struct iface_entry_t iface_entry_t;
+
+/**
+ * A network interface on this system, containing addr_entry_t's
+ */
+struct iface_entry_t {
+
+ /** interface index */
+ int ifindex;
+
+ /** name of the interface */
+ char ifname[IFNAMSIZ];
+
+ /** interface flags, as in netdevice(7) SIOCGIFFLAGS */
+ u_int flags;
+
+ /** list of addresses as host_t */
+ linked_list_t *addrs;
+};
+
+/**
+ * destroy an interface entry
+ */
+static void iface_entry_destroy(iface_entry_t *this)
+{
+ this->addrs->destroy_function(this->addrs, (void*)addr_entry_destroy);
+ free(this);
+}
+
+typedef struct private_kernel_netlink_net_t private_kernel_netlink_net_t;
+
+/**
+ * Private variables and functions of kernel_netlink_net class.
+ */
+struct private_kernel_netlink_net_t {
+ /**
+ * Public part of the kernel_netlink_net_t object.
+ */
+ kernel_netlink_net_t public;
+
+ /**
+ * mutex to lock access to various lists
+ */
+ pthread_mutex_t mutex;
+
+ /**
+ * condition variable to signal virtual IP add/removal
+ */
+ pthread_cond_t cond;
+
+ /**
+ * Cached list of interfaces and its addresses (iface_entry_t)
+ */
+ linked_list_t *ifaces;
+
+ /**
+ * job receiving netlink events
+ */
+ callback_job_t *job;
+
+ /**
+ * netlink rt socket (routing)
+ */
+ netlink_socket_t *socket;
+
+ /**
+ * Netlink rt socket to receive address change events
+ */
+ int socket_events;
+
+ /**
+ * time of the last roam_job
+ */
+ struct timeval last_roam;
+
+ /**
+ * routing table to install routes
+ */
+ int routing_table;
+
+ /**
+ * priority of used routing table
+ */
+ int routing_table_prio;
+
+ /**
+ * whether to react to RTM_NEWROUTE or RTM_DELROUTE events
+ */
+ bool process_route;
+
+};
+
+/**
+ * get the refcount of a virtual ip
+ */
+static int get_vip_refcount(private_kernel_netlink_net_t *this, host_t* ip)
+{
+ iterator_t *ifaces, *addrs;
+ iface_entry_t *iface;
+ addr_entry_t *addr;
+ int refcount = 0;
+
+ ifaces = this->ifaces->create_iterator(this->ifaces, TRUE);
+ while (ifaces->iterate(ifaces, (void**)&iface))
+ {
+ addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
+ while (addrs->iterate(addrs, (void**)&addr))
+ {
+ if (addr->virtual && (iface->flags & IFF_UP) &&
+ ip->ip_equals(ip, addr->ip))
+ {
+ refcount = addr->refcount;
+ break;
+ }
+ }
+ addrs->destroy(addrs);
+ if (refcount)
+ {
+ break;
+ }
+ }
+ ifaces->destroy(ifaces);
+
+ return refcount;
+}
+
+/**
+ * start a roaming job. We delay it for a second and fire only one job
+ * for multiple events. Otherwise we would create two many jobs.
+ */
+static void fire_roam_job(private_kernel_netlink_net_t *this, bool address)
+{
+ struct timeval now;
+
+ if (gettimeofday(&now, NULL) == 0)
+ {
+ if (timercmp(&now, &this->last_roam, >))
+ {
+ now.tv_usec += ROAM_DELAY * 1000;
+ while (now.tv_usec > 1000000)
+ {
+ now.tv_sec++;
+ now.tv_usec -= 1000000;
+ }
+ this->last_roam = now;
+ charon->scheduler->schedule_job(charon->scheduler,
+ (job_t*)roam_job_create(address), ROAM_DELAY);
+ }
+ }
+}
+
+/**
+ * process RTM_NEWLINK/RTM_DELLINK from kernel
+ */
+static void process_link(private_kernel_netlink_net_t *this,
+ struct nlmsghdr *hdr, bool event)
+{
+ struct ifinfomsg* msg = (struct ifinfomsg*)(NLMSG_DATA(hdr));
+ struct rtattr *rta = IFLA_RTA(msg);
+ size_t rtasize = IFLA_PAYLOAD (hdr);
+ iterator_t *iterator;
+ iface_entry_t *current, *entry = NULL;
+ char *name = NULL;
+ bool update = FALSE;
+
+ while(RTA_OK(rta, rtasize))
+ {
+ switch (rta->rta_type)
+ {
+ case IFLA_IFNAME:
+ name = RTA_DATA(rta);
+ break;
+ }
+ rta = RTA_NEXT(rta, rtasize);
+ }
+ if (!name)
+ {
+ name = "(unknown)";
+ }
+
+ switch (hdr->nlmsg_type)
+ {
+ case RTM_NEWLINK:
+ {
+ if (msg->ifi_flags & IFF_LOOPBACK)
+ { /* ignore loopback interfaces */
+ break;
+ }
+ iterator = this->ifaces->create_iterator_locked(this->ifaces,
+ &this->mutex);
+ while (iterator->iterate(iterator, (void**)¤t))
+ {
+ if (current->ifindex == msg->ifi_index)
+ {
+ entry = current;
+ break;
+ }
+ }
+ if (!entry)
+ {
+ entry = malloc_thing(iface_entry_t);
+ entry->ifindex = msg->ifi_index;
+ entry->flags = 0;
+ entry->addrs = linked_list_create();
+ this->ifaces->insert_last(this->ifaces, entry);
+ }
+ memcpy(entry->ifname, name, IFNAMSIZ);
+ entry->ifname[IFNAMSIZ-1] = '\0';
+ if (event)
+ {
+ if (!(entry->flags & IFF_UP) && (msg->ifi_flags & IFF_UP))
+ {
+ update = TRUE;
+ DBG1(DBG_KNL, "interface %s activated", name);
+ }
+ if ((entry->flags & IFF_UP) && !(msg->ifi_flags & IFF_UP))
+ {
+ update = TRUE;
+ DBG1(DBG_KNL, "interface %s deactivated", name);
+ }
+ }
+ entry->flags = msg->ifi_flags;
+ iterator->destroy(iterator);
+ break;
+ }
+ case RTM_DELLINK:
+ {
+ iterator = this->ifaces->create_iterator_locked(this->ifaces,
+ &this->mutex);
+ while (iterator->iterate(iterator, (void**)¤t))
+ {
+ if (current->ifindex == msg->ifi_index)
+ {
+ /* we do not remove it, as an address may be added to a
+ * "down" interface and we wan't to know that. */
+ current->flags = msg->ifi_flags;
+ break;
+ }
+ }
+ iterator->destroy(iterator);
+ break;
+ }
+ }
+
+ /* send an update to all IKE_SAs */
+ if (update && event)
+ {
+ fire_roam_job(this, TRUE);
+ }
+}
+
+/**
+ * process RTM_NEWADDR/RTM_DELADDR from kernel
+ */
+static void process_addr(private_kernel_netlink_net_t *this,
+ struct nlmsghdr *hdr, bool event)
+{
+ struct ifaddrmsg* msg = (struct ifaddrmsg*)(NLMSG_DATA(hdr));
+ struct rtattr *rta = IFA_RTA(msg);
+ size_t rtasize = IFA_PAYLOAD (hdr);
+ host_t *host = NULL;
+ iterator_t *ifaces, *addrs;
+ iface_entry_t *iface;
+ addr_entry_t *addr;
+ chunk_t local = chunk_empty, address = chunk_empty;
+ bool update = FALSE, found = FALSE, changed = FALSE;
+
+ while(RTA_OK(rta, rtasize))
+ {
+ switch (rta->rta_type)
+ {
+ case IFA_LOCAL:
+ local.ptr = RTA_DATA(rta);
+ local.len = RTA_PAYLOAD(rta);
+ break;
+ case IFA_ADDRESS:
+ address.ptr = RTA_DATA(rta);
+ address.len = RTA_PAYLOAD(rta);
+ break;
+ }
+ rta = RTA_NEXT(rta, rtasize);
+ }
+
+ /* For PPP interfaces, we need the IFA_LOCAL address,
+ * IFA_ADDRESS is the peers address. But IFA_LOCAL is
+ * not included in all cases (IPv6?), so fallback to IFA_ADDRESS. */
+ if (local.ptr)
+ {
+ host = host_create_from_chunk(msg->ifa_family, local, 0);
+ }
+ else if (address.ptr)
+ {
+ host = host_create_from_chunk(msg->ifa_family, address, 0);
+ }
+
+ if (host == NULL)
+ { /* bad family? */
+ return;
+ }
+
+ ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
+ while (ifaces->iterate(ifaces, (void**)&iface))
+ {
+ if (iface->ifindex == msg->ifa_index)
+ {
+ addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
+ while (addrs->iterate(addrs, (void**)&addr))
+ {
+ if (host->ip_equals(host, addr->ip))
+ {
+ found = TRUE;
+ if (hdr->nlmsg_type == RTM_DELADDR)
+ {
+ addrs->remove(addrs);
+ if (!addr->virtual)
+ {
+ changed = TRUE;
+ DBG1(DBG_KNL, "%H disappeared from %s",
+ host, iface->ifname);
+ }
+ addr_entry_destroy(addr);
+ }
+ else if (hdr->nlmsg_type == RTM_NEWADDR && addr->virtual)
+ {
+ addr->refcount = 1;
+ }
+ }
+ }
+ addrs->destroy(addrs);
+
+ if (hdr->nlmsg_type == RTM_NEWADDR)
+ {
+ if (!found)
+ {
+ found = TRUE;
+ changed = TRUE;
+ addr = malloc_thing(addr_entry_t);
+ addr->ip = host->clone(host);
+ addr->virtual = FALSE;
+ addr->refcount = 1;
+ addr->scope = msg->ifa_scope;
+
+ iface->addrs->insert_last(iface->addrs, addr);
+ if (event)
+ {
+ DBG1(DBG_KNL, "%H appeared on %s", host, iface->ifname);
+ }
+ }
+ }
+ if (found && (iface->flags & IFF_UP))
+ {
+ update = TRUE;
+ }
+ break;
+ }
+ }
+ ifaces->destroy(ifaces);
+ host->destroy(host);
+
+ /* send an update to all IKE_SAs */
+ if (update && event && changed)
+ {
+ fire_roam_job(this, TRUE);
+ }
+}
+
+/**
+ * process RTM_NEWROUTE and RTM_DELROUTE from kernel
+ */
+static void process_route(private_kernel_netlink_net_t *this, struct nlmsghdr *hdr)
+{
+ struct rtmsg* msg = (struct rtmsg*)(NLMSG_DATA(hdr));
+ struct rtattr *rta = RTM_RTA(msg);
+ size_t rtasize = RTM_PAYLOAD(hdr);
+ host_t *host = NULL;
+
+ while (RTA_OK(rta, rtasize))
+ {
+ switch (rta->rta_type)
+ {
+ case RTA_PREFSRC:
+ host = host_create_from_chunk(msg->rtm_family,
+ chunk_create(RTA_DATA(rta), RTA_PAYLOAD(rta)), 0);
+ break;
+ }
+ rta = RTA_NEXT(rta, rtasize);
+ }
+ if (host)
+ {
+ if (!get_vip_refcount(this, host))
+ { /* ignore routes added for virtual IPs */
+ fire_roam_job(this, FALSE);
+ }
+ host->destroy(host);
+ }
+}
+
+/**
+ * Receives events from kernel
+ */
+static job_requeue_t receive_events(private_kernel_netlink_net_t *this)
+{
+ char response[1024];
+ struct nlmsghdr *hdr = (struct nlmsghdr*)response;
+ struct sockaddr_nl addr;
+ socklen_t addr_len = sizeof(addr);
+ int len, oldstate;
+
+ pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &oldstate);
+ len = recvfrom(this->socket_events, response, sizeof(response), 0,
+ (struct sockaddr*)&addr, &addr_len);
+ pthread_setcancelstate(oldstate, NULL);
+
+ if (len < 0)
+ {
+ switch (errno)
+ {
+ case EINTR:
+ /* interrupted, try again */
+ return JOB_REQUEUE_DIRECT;
+ case EAGAIN:
+ /* no data ready, select again */
+ return JOB_REQUEUE_DIRECT;
+ default:
+ DBG1(DBG_KNL, "unable to receive from rt event socket");
+ sleep(1);
+ return JOB_REQUEUE_FAIR;
+ }
+ }
+
+ if (addr.nl_pid != 0)
+ { /* not from kernel. not interested, try another one */
+ return JOB_REQUEUE_DIRECT;
+ }
+
+ while (NLMSG_OK(hdr, len))
+ {
+ /* looks good so far, dispatch netlink message */
+ switch (hdr->nlmsg_type)
+ {
+ case RTM_NEWADDR:
+ case RTM_DELADDR:
+ process_addr(this, hdr, TRUE);
+ pthread_cond_broadcast(&this->cond);
+ break;
+ case RTM_NEWLINK:
+ case RTM_DELLINK:
+ process_link(this, hdr, TRUE);
+ pthread_cond_broadcast(&this->cond);
+ break;
+ case RTM_NEWROUTE:
+ case RTM_DELROUTE:
+ if (this->process_route)
+ {
+ process_route(this, hdr);
+ }
+ break;
+ default:
+ break;
+ }
+ hdr = NLMSG_NEXT(hdr, len);
+ }
+ return JOB_REQUEUE_DIRECT;
+}
+
+/** enumerator over addresses */
+typedef struct {
+ private_kernel_netlink_net_t* this;
+ /** whether to enumerate down interfaces */
+ bool include_down_ifaces;
+ /** whether to enumerate virtual ip addresses */
+ bool include_virtual_ips;
+} address_enumerator_t;
+
+/**
+ * cleanup function for address enumerator
+ */
+static void address_enumerator_destroy(address_enumerator_t *data)
+{
+ pthread_mutex_unlock(&data->this->mutex);
+ free(data);
+}
+
+/**
+ * filter for addresses
+ */
+static bool filter_addresses(address_enumerator_t *data, addr_entry_t** in, host_t** out)
+{
+ if (!data->include_virtual_ips && (*in)->virtual)
+ { /* skip virtual interfaces added by us */
+ return FALSE;
+ }
+ if ((*in)->scope >= RT_SCOPE_LINK)
+ { /* skip addresses with a unusable scope */
+ return FALSE;
+ }
+ *out = (*in)->ip;
+ return TRUE;
+}
+
+/**
+ * enumerator constructor for interfaces
+ */
+static enumerator_t *create_iface_enumerator(iface_entry_t *iface, address_enumerator_t *data)
+{
+ return enumerator_create_filter(iface->addrs->create_enumerator(iface->addrs),
+ (void*)filter_addresses, data, NULL);
+}
+
+/**
+ * filter for interfaces
+ */
+static bool filter_interfaces(address_enumerator_t *data, iface_entry_t** in, iface_entry_t** out)
+{
+ if (!data->include_down_ifaces && !((*in)->flags & IFF_UP))
+ { /* skip interfaces not up */
+ return FALSE;
+ }
+ *out = *in;
+ return TRUE;
+}
+
+/**
+ * implementation of kernel_net_t.create_address_enumerator
+ */
+static enumerator_t *create_address_enumerator(private_kernel_netlink_net_t *this,
+ bool include_down_ifaces, bool include_virtual_ips)
+{
+ address_enumerator_t *data = malloc_thing(address_enumerator_t);
+ data->this = this;
+ data->include_down_ifaces = include_down_ifaces;
+ data->include_virtual_ips = include_virtual_ips;
+
+ pthread_mutex_lock(&this->mutex);
+ return enumerator_create_nested(
+ enumerator_create_filter(this->ifaces->create_enumerator(this->ifaces),
+ (void*)filter_interfaces, data, NULL),
+ (void*)create_iface_enumerator, data, (void*)address_enumerator_destroy);
+}
+
+/**
+ * implementation of kernel_net_t.get_interface_name
+ */
+static char *get_interface_name(private_kernel_netlink_net_t *this, host_t* ip)
+{
+ iterator_t *ifaces, *addrs;
+ iface_entry_t *iface;
+ addr_entry_t *addr;
+ char *name = NULL;
+
+ DBG2(DBG_KNL, "getting interface name for %H", ip);
+
+ ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
+ while (ifaces->iterate(ifaces, (void**)&iface))
+ {
+ addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
+ while (addrs->iterate(addrs, (void**)&addr))
+ {
+ if (ip->ip_equals(ip, addr->ip))
+ {
+ name = strdup(iface->ifname);
+ break;
+ }
+ }
+ addrs->destroy(addrs);
+ if (name)
+ {
+ break;
+ }
+ }
+ ifaces->destroy(ifaces);
+
+ if (name)
+ {
+ DBG2(DBG_KNL, "%H is on interface %s", ip, name);
+ }
+ else
+ {
+ DBG2(DBG_KNL, "%H is not a local address", ip);
+ }
+ return name;
+}
+
+/**
+ * get the index of an interface by name
+ */
+static int get_interface_index(private_kernel_netlink_net_t *this, char* name)
+{
+ iterator_t *ifaces;
+ iface_entry_t *iface;
+ int ifindex = 0;
+
+ DBG2(DBG_KNL, "getting iface index for %s", name);
+
+ ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
+ while (ifaces->iterate(ifaces, (void**)&iface))
+ {
+ if (streq(name, iface->ifname))
+ {
+ ifindex = iface->ifindex;
+ break;
+ }
+ }
+ ifaces->destroy(ifaces);
+
+ if (ifindex == 0)
+ {
+ DBG1(DBG_KNL, "unable to get interface index for %s", name);
+ }
+ return ifindex;
+}
+
+/**
+ * check if an address (chunk) addr is in subnet (net with net_len net bits)
+ */
+static bool addr_in_subnet(chunk_t addr, chunk_t net, int net_len)
+{
+ int bit, byte;
+
+ if (addr.len != net.len)
+ {
+ return FALSE;
+ }
+ /* scan through all bits, beginning in the front */
+ for (byte = 0; byte < addr.len; byte++)
+ {
+ for (bit = 7; bit >= 0; bit--)
+ {
+ /* check if bits are equal (or we reached the end of the net) */
+ if (bit + byte * 8 > net_len)
+ {
+ return TRUE;
+ }
+ if (((1<<bit) & addr.ptr[byte]) != ((1<<bit) & net.ptr[byte]))
+ {
+ return FALSE;
+ }
+ }
+ }
+ return TRUE;
+}
+
+/**
+ * Get a route: If "nexthop", the nexthop is returned. source addr otherwise.
+ */
+static host_t *get_route(private_kernel_netlink_net_t *this, host_t *dest,
+ bool nexthop)
+{
+ unsigned char request[NETLINK_BUFFER_SIZE];
+ struct nlmsghdr *hdr, *out, *current;
+ struct rtmsg *msg;
+ chunk_t chunk;
+ size_t len;
+ int best = -1;
+ host_t *src = NULL, *gtw = NULL;
+
+ DBG2(DBG_KNL, "getting address to reach %H", dest);
+
+ memset(&request, 0, sizeof(request));
+
+ hdr = (struct nlmsghdr*)request;
+ hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP | NLM_F_ROOT;
+ hdr->nlmsg_type = RTM_GETROUTE;
+ hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
+
+ msg = (struct rtmsg*)NLMSG_DATA(hdr);
+ msg->rtm_family = dest->get_family(dest);
+
+ chunk = dest->get_address(dest);
+ netlink_add_attribute(hdr, RTA_DST, chunk, sizeof(request));
+
+ if (this->socket->send(this->socket, hdr, &out, &len) != SUCCESS)
+ {
+ DBG1(DBG_KNL, "getting address to %H failed", dest);
+ return NULL;
+ }
+ current = out;
+ while (NLMSG_OK(current, len))
+ {
+ switch (current->nlmsg_type)
+ {
+ case NLMSG_DONE:
+ break;
+ case RTM_NEWROUTE:
+ {
+ struct rtattr *rta;
+ size_t rtasize;
+ chunk_t rta_gtw, rta_src, rta_dst;
+ u_int32_t rta_oif = 0;
+
+ rta_gtw = rta_src = rta_dst = chunk_empty;
+ msg = (struct rtmsg*)(NLMSG_DATA(current));
+ rta = RTM_RTA(msg);
+ rtasize = RTM_PAYLOAD(current);
+ while (RTA_OK(rta, rtasize))
+ {
+ switch (rta->rta_type)
+ {
+ case RTA_PREFSRC:
+ rta_src = chunk_create(RTA_DATA(rta), RTA_PAYLOAD(rta));
+ break;
+ case RTA_GATEWAY:
+ rta_gtw = chunk_create(RTA_DATA(rta), RTA_PAYLOAD(rta));
+ break;
+ case RTA_DST:
+ rta_dst = chunk_create(RTA_DATA(rta), RTA_PAYLOAD(rta));
+ break;
+ case RTA_OIF:
+ if (RTA_PAYLOAD(rta) == sizeof(rta_oif))
+ {
+ rta_oif = *(u_int32_t*)RTA_DATA(rta);
+ }
+ break;
+ }
+ rta = RTA_NEXT(rta, rtasize);
+ }
+
+ /* apply the route if:
+ * - it is not from our own ipsec routing table
+ * - is better than a previous one
+ * - is the default route or
+ * - its destination net contains our destination
+ */
+ if ((this->routing_table == 0 ||msg->rtm_table != this->routing_table)
+ && msg->rtm_dst_len > best
+ && (msg->rtm_dst_len == 0 || /* default route */
+ (rta_dst.ptr && addr_in_subnet(chunk, rta_dst, msg->rtm_dst_len))))
+ {
+ iterator_t *ifaces, *addrs;
+ iface_entry_t *iface;
+ addr_entry_t *addr;
+
+ best = msg->rtm_dst_len;
+ if (nexthop)
+ {
+ DESTROY_IF(gtw);
+ gtw = host_create_from_chunk(msg->rtm_family, rta_gtw, 0);
+ }
+ else if (rta_src.ptr)
+ {
+ DESTROY_IF(src);
+ src = host_create_from_chunk(msg->rtm_family, rta_src, 0);
+ if (get_vip_refcount(this, src))
+ { /* skip source address if it is installed by us */
+ DESTROY_IF(src);
+ src = NULL;
+ current = NLMSG_NEXT(current, len);
+ continue;
+ }
+ }
+ else
+ {
+ /* no source addr, get one from the interfaces */
+ ifaces = this->ifaces->create_iterator_locked(
+ this->ifaces, &this->mutex);
+ while (ifaces->iterate(ifaces, (void**)&iface))
+ {
+ if (iface->ifindex == rta_oif)
+ {
+ addrs = iface->addrs->create_iterator(
+ iface->addrs, TRUE);
+ while (addrs->iterate(addrs, (void**)&addr))
+ {
+ chunk_t ip = addr->ip->get_address(addr->ip);
+ if ((msg->rtm_dst_len == 0 &&
+ addr->ip->get_family(addr->ip) ==
+ dest->get_family(dest)) ||
+ addr_in_subnet(ip, rta_dst, msg->rtm_dst_len))
+ {
+ DESTROY_IF(src);
+ src = addr->ip->clone(addr->ip);
+ break;
+ }
+ }
+ addrs->destroy(addrs);
+ }
+ }
+ ifaces->destroy(ifaces);
+ }
+ }
+ /* FALL through */
+ }
+ default:
+ current = NLMSG_NEXT(current, len);
+ continue;
+ }
+ break;
+ }
+ free(out);
+
+ if (nexthop)
+ {
+ if (gtw)
+ {
+ return gtw;
+ }
+ return dest->clone(dest);
+ }
+ return src;
+}
+
+/**
+ * Implementation of kernel_net_t.get_source_addr.
+ */
+static host_t* get_source_addr(private_kernel_netlink_net_t *this, host_t *dest)
+{
+ return get_route(this, dest, FALSE);
+}
+
+/**
+ * Implementation of kernel_net_t.get_nexthop.
+ */
+static host_t* get_nexthop(private_kernel_netlink_net_t *this, host_t *dest)
+{
+ return get_route(this, dest, TRUE);
+}
+
+/**
+ * Manages the creation and deletion of ip addresses on an interface.
+ * By setting the appropriate nlmsg_type, the ip will be set or unset.
+ */
+static status_t manage_ipaddr(private_kernel_netlink_net_t *this, int nlmsg_type,
+ int flags, int if_index, host_t *ip)
+{
+ unsigned char request[NETLINK_BUFFER_SIZE];
+ struct nlmsghdr *hdr;
+ struct ifaddrmsg *msg;
+ chunk_t chunk;
+
+ memset(&request, 0, sizeof(request));
+
+ chunk = ip->get_address(ip);
+
+ hdr = (struct nlmsghdr*)request;
+ hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags;
+ hdr->nlmsg_type = nlmsg_type;
+ hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
+
+ msg = (struct ifaddrmsg*)NLMSG_DATA(hdr);
+ msg->ifa_family = ip->get_family(ip);
+ msg->ifa_flags = 0;
+ msg->ifa_prefixlen = 8 * chunk.len;
+ msg->ifa_scope = RT_SCOPE_UNIVERSE;
+ msg->ifa_index = if_index;
+
+ netlink_add_attribute(hdr, IFA_LOCAL, chunk, sizeof(request));
+
+ return this->socket->send_ack(this->socket, hdr);
+}
+
+/**
+ * Implementation of kernel_net_t.add_ip.
+ */
+static status_t add_ip(private_kernel_netlink_net_t *this,
+ host_t *virtual_ip, host_t *iface_ip)
+{
+ iface_entry_t *iface;
+ addr_entry_t *addr;
+ iterator_t *addrs, *ifaces;
+ int ifindex;
+
+ DBG2(DBG_KNL, "adding virtual IP %H", virtual_ip);
+
+ ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
+ while (ifaces->iterate(ifaces, (void**)&iface))
+ {
+ bool iface_found = FALSE;
+
+ addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
+ while (addrs->iterate(addrs, (void**)&addr))
+ {
+ if (iface_ip->ip_equals(iface_ip, addr->ip))
+ {
+ iface_found = TRUE;
+ }
+ else if (virtual_ip->ip_equals(virtual_ip, addr->ip))
+ {
+ addr->refcount++;
+ DBG2(DBG_KNL, "virtual IP %H already installed on %s",
+ virtual_ip, iface->ifname);
+ addrs->destroy(addrs);
+ ifaces->destroy(ifaces);
+ return SUCCESS;
+ }
+ }
+ addrs->destroy(addrs);
+
+ if (iface_found)
+ {
+ ifindex = iface->ifindex;
+ addr = malloc_thing(addr_entry_t);
+ addr->ip = virtual_ip->clone(virtual_ip);
+ addr->refcount = 0;
+ addr->virtual = TRUE;
+ addr->scope = RT_SCOPE_UNIVERSE;
+ iface->addrs->insert_last(iface->addrs, addr);
+
+ if (manage_ipaddr(this, RTM_NEWADDR, NLM_F_CREATE | NLM_F_EXCL,
+ ifindex, virtual_ip) == SUCCESS)
+ {
+ while (get_vip_refcount(this, virtual_ip) == 0)
+ { /* wait until address appears */
+ pthread_cond_wait(&this->cond, &this->mutex);
+ }
+ ifaces->destroy(ifaces);
+ return SUCCESS;
+ }
+ ifaces->destroy(ifaces);
+ DBG1(DBG_KNL, "adding virtual IP %H failed", virtual_ip);
+ return FAILED;
+ }
+ }
+ ifaces->destroy(ifaces);
+
+ DBG1(DBG_KNL, "interface address %H not found, unable to install"
+ "virtual IP %H", iface_ip, virtual_ip);
+ return FAILED;
+}
+
+/**
+ * Implementation of kernel_net_t.del_ip.
+ */
+static status_t del_ip(private_kernel_netlink_net_t *this, host_t *virtual_ip)
+{
+ iface_entry_t *iface;
+ addr_entry_t *addr;
+ iterator_t *addrs, *ifaces;
+ status_t status;
+ int ifindex;
+
+ DBG2(DBG_KNL, "deleting virtual IP %H", virtual_ip);
+
+ ifaces = this->ifaces->create_iterator_locked(this->ifaces, &this->mutex);
+ while (ifaces->iterate(ifaces, (void**)&iface))
+ {
+ addrs = iface->addrs->create_iterator(iface->addrs, TRUE);
+ while (addrs->iterate(addrs, (void**)&addr))
+ {
+ if (virtual_ip->ip_equals(virtual_ip, addr->ip))
+ {
+ ifindex = iface->ifindex;
+ if (addr->refcount == 1)
+ {
+ status = manage_ipaddr(this, RTM_DELADDR, 0,
+ ifindex, virtual_ip);
+ if (status == SUCCESS)
+ { /* wait until the address is really gone */
+ while (get_vip_refcount(this, virtual_ip) > 0)
+ {
+ pthread_cond_wait(&this->cond, &this->mutex);
+ }
+ }
+ addrs->destroy(addrs);
+ ifaces->destroy(ifaces);
+ return status;
+ }
+ else
+&nb
projects / strongswan.git / commitdiff