92d85f9c90ce6d3f2927e58562fe336b1dc10a6c
[strongswan.git] / src / libcharon / kernel / kernel_interface.h
1 /*
2 * Copyright (C) 2006-2009 Tobias Brunner
3 * Copyright (C) 2006 Daniel Roethlisberger
4 * Copyright (C) 2005-2006 Martin Willi
5 * Copyright (C) 2005 Jan Hutter
6 * Hochschule fuer Technik Rapperswil
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 * for more details.
17 */
18
19 /**
20 * @defgroup kernel_interface kernel_interface
21 * @{ @ingroup kernel
22 */
23
24 #ifndef KERNEL_INTERFACE_H_
25 #define KERNEL_INTERFACE_H_
26
27 typedef struct kernel_interface_t kernel_interface_t;
28
29 #include <utils/host.h>
30 #include <crypto/prf_plus.h>
31 #include <encoding/payloads/proposal_substructure.h>
32
33 #include <kernel/kernel_ipsec.h>
34 #include <kernel/kernel_net.h>
35
36 /**
37 * Constructor function for ipsec kernel interface
38 */
39 typedef kernel_ipsec_t* (*kernel_ipsec_constructor_t)(void);
40
41 /**
42 * Constructor function for network kernel interface
43 */
44 typedef kernel_net_t* (*kernel_net_constructor_t)(void);
45
46 /**
47 * Manager and wrapper for different kernel interfaces.
48 *
49 * The kernel interface handles the communication with the kernel
50 * for SA and policy management and interface and IP address management.
51 */
52 struct kernel_interface_t {
53
54 /**
55 * Get a SPI from the kernel.
56 *
57 * @param src source address of SA
58 * @param dst destination address of SA
59 * @param protocol protocol for SA (ESP/AH)
60 * @param reqid unique ID for this SA
61 * @param spi allocated spi
62 * @return SUCCESS if operation completed
63 */
64 status_t (*get_spi)(kernel_interface_t *this, host_t *src, host_t *dst,
65 protocol_id_t protocol, u_int32_t reqid, u_int32_t *spi);
66
67 /**
68 * Get a Compression Parameter Index (CPI) from the kernel.
69 *
70 * @param src source address of SA
71 * @param dst destination address of SA
72 * @param reqid unique ID for the corresponding SA
73 * @param cpi allocated cpi
74 * @return SUCCESS if operation completed
75 */
76 status_t (*get_cpi)(kernel_interface_t *this, host_t *src, host_t *dst,
77 u_int32_t reqid, u_int16_t *cpi);
78
79 /**
80 * Add an SA to the SAD.
81 *
82 * add_sa() may update an already allocated
83 * SPI (via get_spi). In this case, the replace
84 * flag must be set.
85 * This function does install a single SA for a
86 * single protocol in one direction.
87 *
88 * @param src source address for this SA
89 * @param dst destination address for this SA
90 * @param spi SPI allocated by us or remote peer
91 * @param protocol protocol for this SA (ESP/AH)
92 * @param reqid unique ID for this SA
93 * @param mark optional mark for this SA
94 * @param lifetime lifetime_cfg_t for this SA
95 * @param enc_alg Algorithm to use for encryption (ESP only)
96 * @param enc_key key to use for encryption
97 * @param int_alg Algorithm to use for integrity protection
98 * @param int_key key to use for integrity protection
99 * @param mode mode of the SA (tunnel, transport)
100 * @param ipcomp IPComp transform to use
101 * @param cpi CPI for IPComp
102 * @param encap enable UDP encapsulation for NAT traversal
103 * @param inbound TRUE if this is an inbound SA
104 * @param src_ts traffic selector with BEET source address
105 * @param dst_ts traffic selector with BEET destination address
106 * @return SUCCESS if operation completed
107 */
108 status_t (*add_sa) (kernel_interface_t *this,
109 host_t *src, host_t *dst, u_int32_t spi,
110 protocol_id_t protocol, u_int32_t reqid, mark_t mark,
111 lifetime_cfg_t *lifetime,
112 u_int16_t enc_alg, chunk_t enc_key,
113 u_int16_t int_alg, chunk_t int_key,
114 ipsec_mode_t mode, u_int16_t ipcomp, u_int16_t cpi,
115 bool encap, bool inbound,
116 traffic_selector_t *src_ts, traffic_selector_t *dst_ts);
117
118 /**
119 * Update the hosts on an installed SA.
120 *
121 * We cannot directly update the destination address as the kernel
122 * requires the spi, the protocol AND the destination address (and family)
123 * to identify SAs. Therefore if the destination address changed we
124 * create a new SA and delete the old one.
125 *
126 * @param spi SPI of the SA
127 * @param protocol protocol for this SA (ESP/AH)
128 * @param cpi CPI for IPComp, 0 if no IPComp is used
129 * @param src current source address
130 * @param dst current destination address
131 * @param new_src new source address
132 * @param new_dst new destination address
133 * @param encap current use of UDP encapsulation
134 * @param new_encap new use of UDP encapsulation
135 * @param mark optional mark for this SA
136 * @return SUCCESS if operation completed, NOT_SUPPORTED if
137 * the kernel interface can't update the SA
138 */
139 status_t (*update_sa)(kernel_interface_t *this,
140 u_int32_t spi, protocol_id_t protocol, u_int16_t cpi,
141 host_t *src, host_t *dst,
142 host_t *new_src, host_t *new_dst,
143 bool encap, bool new_encap, mark_t mark);
144
145 /**
146 * Query the number of bytes processed by an SA from the SAD.
147 *
148 * @param src source address for this SA
149 * @param dst destination address for this SA
150 * @param spi SPI allocated by us or remote peer
151 * @param protocol protocol for this SA (ESP/AH)
152 * @param mark optional mark for this SA
153 * @param[out] bytes the number of bytes processed by SA
154 * @return SUCCESS if operation completed
155 */
156 status_t (*query_sa) (kernel_interface_t *this, host_t *src, host_t *dst,
157 u_int32_t spi, protocol_id_t protocol, mark_t mark,
158 u_int64_t *bytes);
159
160 /**
161 * Delete a previously installed SA from the SAD.
162 *
163 * @param src source address for this SA
164 * @param dst destination address for this SA
165 * @param spi SPI allocated by us or remote peer
166 * @param protocol protocol for this SA (ESP/AH)
167 * @param cpi CPI for IPComp or 0
168 * @param mark optional mark for this SA
169 * @return SUCCESS if operation completed
170 */
171 status_t (*del_sa) (kernel_interface_t *this, host_t *src, host_t *dst,
172 u_int32_t spi, protocol_id_t protocol, u_int16_t cpi,
173 mark_t mark);
174
175 /**
176 * Add a policy to the SPD.
177 *
178 * A policy is always associated to an SA. Traffic which matches a
179 * policy is handled by the SA with the same reqid.
180 *
181 * @param src source address of SA
182 * @param dst dest address of SA
183 * @param src_ts traffic selector to match traffic source
184 * @param dst_ts traffic selector to match traffic dest
185 * @param direction direction of traffic, POLICY_IN, POLICY_OUT, POLICY_FWD
186 * @param spi SPI of SA
187 * @param protocol protocol to use to protect traffic (AH/ESP)
188 * @param reqid unique ID of an SA to use to enforce policy
189 * @param mark mark for this policy
190 * @param mode mode of SA (tunnel, transport)
191 * @param ipcomp the IPComp transform used
192 * @param cpi CPI for IPComp
193 * @param routed TRUE, if this policy is routed in the kernel
194 * @return SUCCESS if operation completed
195 */
196 status_t (*add_policy) (kernel_interface_t *this,
197 host_t *src, host_t *dst,
198 traffic_selector_t *src_ts,
199 traffic_selector_t *dst_ts,
200 policy_dir_t direction, u_int32_t spi,
201 protocol_id_t protocol, u_int32_t reqid,
202 mark_t mark, ipsec_mode_t mode, u_int16_t ipcomp,
203 u_int16_t cpi, bool routed);
204
205 /**
206 * Query the use time of a policy.
207 *
208 * The use time of a policy is the time the policy was used
209 * for the last time.
210 *
211 * @param src_ts traffic selector to match traffic source
212 * @param dst_ts traffic selector to match traffic dest
213 * @param direction direction of traffic, POLICY_IN, POLICY_OUT, POLICY_FWD
214 * @param mark optional mark
215 * @param[out] use_time the time of this SA's last use
216 * @return SUCCESS if operation completed
217 */
218 status_t (*query_policy) (kernel_interface_t *this,
219 traffic_selector_t *src_ts,
220 traffic_selector_t *dst_ts,
221 policy_dir_t direction, mark_t mark,
222 u_int32_t *use_time);
223
224 /**
225 * Remove a policy from the SPD.
226 *
227 * The kernel interface implements reference counting for policies.
228 * If the same policy is installed multiple times (in the case of rekeying),
229 * the reference counter is increased. del_policy() decreases the ref counter
230 * and removes the policy only when no more references are available.
231 *
232 * @param src_ts traffic selector to match traffic source
233 * @param dst_ts traffic selector to match traffic dest
234 * @param direction direction of traffic, POLICY_IN, POLICY_OUT, POLICY_FWD
235 * @param mark optional mark
236 * @param unrouted TRUE, if this policy is unrouted from the kernel
237 * @return SUCCESS if operation completed
238 */
239 status_t (*del_policy) (kernel_interface_t *this,
240 traffic_selector_t *src_ts,
241 traffic_selector_t *dst_ts,
242 policy_dir_t direction, mark_t mark,
243 bool unrouted);
244
245 /**
246 * Get our outgoing source address for a destination.
247 *
248 * Does a route lookup to get the source address used to reach dest.
249 * The returned host is allocated and must be destroyed.
250 * An optional src address can be used to check if a route is available
251 * for given source to dest.
252 *
253 * @param dest target destination address
254 * @param src source address to check, or NULL
255 * @return outgoing source address, NULL if unreachable
256 */
257 host_t* (*get_source_addr)(kernel_interface_t *this,
258 host_t *dest, host_t *src);
259
260 /**
261 * Get the next hop for a destination.
262 *
263 * Does a route lookup to get the next hop used to reach dest.
264 * The returned host is allocated and must be destroyed.
265 *
266 * @param dest target destination address
267 * @return next hop address, NULL if unreachable
268 */
269 host_t* (*get_nexthop)(kernel_interface_t *this, host_t *dest);
270
271 /**
272 * Get the interface name of a local address.
273 *
274 * @param host address to get interface name from
275 * @return allocated interface name, or NULL if not found
276 */
277 char* (*get_interface) (kernel_interface_t *this, host_t *host);
278
279 /**
280 * Creates an enumerator over all local addresses.
281 *
282 * This function blocks an internal cached address list until the
283 * enumerator gets destroyed.
284 * The hosts are read-only, do not modify of free.
285 *
286 * @param include_down_ifaces TRUE to enumerate addresses from down interfaces
287 * @param include_virtual_ips TRUE to enumerate virtual ip addresses
288 * @return enumerator over host_t's
289 */
290 enumerator_t *(*create_address_enumerator) (kernel_interface_t *this,
291 bool include_down_ifaces, bool include_virtual_ips);
292
293 /**
294 * Add a virtual IP to an interface.
295 *
296 * Virtual IPs are attached to an interface. If an IP is added multiple
297 * times, the IP is refcounted and not removed until del_ip() was called
298 * as many times as add_ip().
299 * The virtual IP is attached to the interface where the iface_ip is found.
300 *
301 * @param virtual_ip virtual ip address to assign
302 * @param iface_ip IP of an interface to attach virtual IP
303 * @return SUCCESS if operation completed
304 */
305 status_t (*add_ip) (kernel_interface_t *this, host_t *virtual_ip,
306 host_t *iface_ip);
307
308 /**
309 * Remove a virtual IP from an interface.
310 *
311 * The kernel interface uses refcounting, see add_ip().
312 *
313 * @param virtual_ip virtual ip address to assign
314 * @return SUCCESS if operation completed
315 */
316 status_t (*del_ip) (kernel_interface_t *this, host_t *virtual_ip);
317
318 /**
319 * Add a route.
320 *
321 * @param dst_net destination net
322 * @param prefixlen destination net prefix length
323 * @param gateway gateway for this route
324 * @param src_ip sourc ip of the route
325 * @param if_name name of the interface the route is bound to
326 * @return SUCCESS if operation completed
327 * ALREADY_DONE if the route already exists
328 */
329 status_t (*add_route) (kernel_interface_t *this, chunk_t dst_net, u_int8_t prefixlen,
330 host_t *gateway, host_t *src_ip, char *if_name);
331
332 /**
333 * Delete a route.
334 *
335 * @param dst_net destination net
336 * @param prefixlen destination net prefix length
337 * @param gateway gateway for this route
338 * @param src_ip sourc ip of the route
339 * @param if_name name of the interface the route is bound to
340 * @return SUCCESS if operation completed
341 */
342 status_t (*del_route) (kernel_interface_t *this, chunk_t dst_net, u_int8_t prefixlen,
343 host_t *gateway, host_t *src_ip, char *if_name);
344
345 /**
346 * Set up a bypass policy for a given socket.
347 *
348 * @param fd socket file descriptor to setup policy for
349 * @param family protocol family of the socket
350 * @return TRUE of policy set up successfully
351 */
352 bool (*bypass_socket)(kernel_interface_t *this, int fd, int family);
353
354 /**
355 * manager methods
356 */
357
358 /**
359 * Tries to find an ip address of a local interface that is included in the
360 * supplied traffic selector.
361 *
362 * @param ts traffic selector
363 * @param ip returned ip (has to be destroyed)
364 * @return SUCCESS if address found
365 */
366 status_t (*get_address_by_ts) (kernel_interface_t *this,
367 traffic_selector_t *ts, host_t **ip);
368
369 /**
370 * Register an ipsec kernel interface constructor on the manager.
371 *
372 * @param create constructor to register
373 */
374 void (*add_ipsec_interface)(kernel_interface_t *this, kernel_ipsec_constructor_t create);
375
376 /**
377 * Unregister an ipsec kernel interface constructor.
378 *
379 * @param create constructor to unregister
380 */
381 void (*remove_ipsec_interface)(kernel_interface_t *this, kernel_ipsec_constructor_t create);
382
383 /**
384 * Register a network kernel interface constructor on the manager.
385 *
386 * @param create constructor to register
387 */
388 void (*add_net_interface)(kernel_interface_t *this, kernel_net_constructor_t create);
389
390 /**
391 * Unregister a network kernel interface constructor.
392 *
393 * @param create constructor to unregister
394 */
395 void (*remove_net_interface)(kernel_interface_t *this, kernel_net_constructor_t create);
396
397 /**
398 * Destroys a kernel_interface_manager_t object.
399 */
400 void (*destroy) (kernel_interface_t *this);
401 };
402
403 /**
404 * Creates an object of type kernel_interface_t.
405 */
406 kernel_interface_t *kernel_interface_create(void);
407
408 #endif /** KERNEL_INTERFACE_H_ @}*/