src/libfreeswan/ipsec_tunnel.h

   1 /*
   2  * IPSEC tunneling code
   3  * Copyright (C) 1996, 1997  John Ioannidis.
   4  * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003  Richard Guy Briggs.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2 of the License, or (at your
   9  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * for more details.
  15  *
  16  * RCSID $Id: ipsec_tunnel.h,v 1.1 2004/03/15 20:35:25 as Exp $
  17  */
  18
  19 #include <linux/types.h>
  20
  21 #ifdef NET_21
  22 # define DEV_QUEUE_XMIT(skb, device, pri) {\
  23         skb->dev = device; \
  24         neigh_compat_output(skb); \
  25         /* skb->dst->output(skb); */ \
  26  }
  27 # define ICMP_SEND(skb_in, type, code, info, dev) \
  28         icmp_send(skb_in, type, code, htonl(info))
  29 # define IP_SEND(skb, dev) \
  30         ip_send(skb);
  31 #else /* NET_21 */
  32 # define DEV_QUEUE_XMIT(skb, device, pri) {\
  33         dev_queue_xmit(skb, device, pri); \
  34  }
  35 # define ICMP_SEND(skb_in, type, code, info, dev) \
  36         icmp_send(skb_in, type, code, info, dev)
  37 # define IP_SEND(skb, dev) \
  38         if(ntohs(iph->tot_len) > physmtu) { \
  39                 ip_fragment(NULL, skb, dev, 0); \
  40                 ipsec_kfree_skb(skb); \
  41         } else { \
  42                 dev_queue_xmit(skb, dev, SOPRI_NORMAL); \
  43         }
  44 #endif /* NET_21 */
  45
  46
  47 /*
  48  * Heavily based on drivers/net/new_tunnel.c.  Lots
  49  * of ideas also taken from the 2.1.x version of drivers/net/shaper.c
  50  */
  51
  52 struct ipsectunnelconf
  53 {
  54         __u32   cf_cmd;
  55         union
  56         {
  57                 char    cfu_name[12];
  58         } cf_u;
  59 #define cf_name cf_u.cfu_name
  60 };
  61
  62 #define IPSEC_SET_DEV   (SIOCDEVPRIVATE)
  63 #define IPSEC_DEL_DEV   (SIOCDEVPRIVATE + 1)
  64 #define IPSEC_CLR_DEV   (SIOCDEVPRIVATE + 2)
  65
  66 #ifdef __KERNEL__
  67 #include <linux/version.h>
  68 #ifndef KERNEL_VERSION
  69 #  define KERNEL_VERSION(x,y,z) (((x)<<16)+((y)<<8)+(z))
  70 #endif
  71 struct ipsecpriv
  72 {
  73         struct sk_buff_head sendq;
  74         struct device *dev;
  75         struct wait_queue *wait_queue;
  76         char locked;
  77         int  (*hard_start_xmit) (struct sk_buff *skb,
  78                 struct device *dev);
  79         int  (*hard_header) (struct sk_buff *skb,
  80                 struct device *dev,
  81                 unsigned short type,
  82                 void *daddr,
  83                 void *saddr,
  84                 unsigned len);
  85 #ifdef NET_21
  86         int  (*rebuild_header)(struct sk_buff *skb);
  87 #else /* NET_21 */
  88         int  (*rebuild_header)(void *buff, struct device *dev,
  89                         unsigned long raddr, struct sk_buff *skb);
  90 #endif /* NET_21 */
  91         int  (*set_mac_address)(struct device *dev, void *addr);
  92 #ifndef NET_21
  93         void (*header_cache_bind)(struct hh_cache **hhp, struct device *dev,
  94                                  unsigned short htype, __u32 daddr);
  95 #endif /* !NET_21 */
  96         void (*header_cache_update)(struct hh_cache *hh, struct device *dev, unsigned char *  haddr);
  97         struct net_device_stats *(*get_stats)(struct device *dev);
  98         struct net_device_stats mystats;
  99         int mtu;        /* What is the desired MTU? */
 100 };
 101
 102 extern char ipsec_tunnel_c_version[];
 103
 104 extern struct device *ipsecdevices[IPSEC_NUM_IF];
 105
 106 int ipsec_tunnel_init_devices(void);
 107
 108 /* void */ int ipsec_tunnel_cleanup_devices(void);
 109
 110 extern /* void */ int ipsec_init(void);
 111
 112 extern int ipsec_tunnel_start_xmit(struct sk_buff *skb, struct device *dev);
 113
 114 #ifdef CONFIG_IPSEC_DEBUG
 115 extern int debug_tunnel;
 116 extern int sysctl_ipsec_debug_verbose;
 117 #endif /* CONFIG_IPSEC_DEBUG */
 118 #endif /* __KERNEL__ */
 119
 120 #ifdef CONFIG_IPSEC_DEBUG
 121 #define DB_TN_INIT      0x0001
 122 #define DB_TN_PROCFS    0x0002
 123 #define DB_TN_XMIT      0x0010
 124 #define DB_TN_OHDR      0x0020
 125 #define DB_TN_CROUT     0x0040
 126 #define DB_TN_OXFS      0x0080
 127 #define DB_TN_REVEC     0x0100
 128 #endif /* CONFIG_IPSEC_DEBUG */