linux/net/ipsec/ipsec_life.c

   1 /*
   2  * @(#) lifetime structure utilities
   3  *
   4  * Copyright (C) 2001  Richard Guy Briggs  <rgb@freeswan.org>
   5  *                 and Michael Richardson  <mcr@freeswan.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or (at your
  10  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15  * for more details.
  16  *
  17  * RCSID $Id: ipsec_life.c,v 1.3 2004/04/28 08:06:22 as Exp $
  18  *
  19  */
  20
  21 /*
  22  * This provides series of utility functions for dealing with lifetime
  23  * structures.
  24  *
  25  * ipsec_check_lifetime - returns -1    hard lifetime exceeded
  26  *                                 0    soft lifetime exceeded
  27  *                                 1    everything is okay
  28  *                        based upon whether or not the count exceeds hard/soft
  29  *
  30  */
  31
  32 #define __NO_VERSION__
  33 #include <linux/module.h>
  34 #include <linux/config.h>       /* for CONFIG_IP_FORWARD */
  35 #include <linux/version.h>
  36 #include <linux/kernel.h> /* printk() */
  37
  38 #include "freeswan/ipsec_param.h"
  39
  40 #include <linux/netdevice.h>   /* struct device, struct net_device_stats and other headers */
  41 #include <linux/etherdevice.h> /* eth_type_trans */
  42 #include <linux/skbuff.h>
  43 #include <freeswan.h>
  44
  45 #include "freeswan/radij.h"
  46 #include "freeswan/ipsec_life.h"
  47 #include "freeswan/ipsec_xform.h"
  48 #include "freeswan/ipsec_eroute.h"
  49 #include "freeswan/ipsec_encap.h"
  50 #include "freeswan/ipsec_radij.h"
  51
  52 #include "freeswan/ipsec_sa.h"
  53 #include "freeswan/ipsec_tunnel.h"
  54 #include "freeswan/ipsec_ipe4.h"
  55 #include "freeswan/ipsec_ah.h"
  56 #include "freeswan/ipsec_esp.h"
  57
  58 #ifdef CONFIG_IPSEC_IPCOMP
  59 #include "freeswan/ipcomp.h"
  60 #endif /* CONFIG_IPSEC_IPCOMP */
  61
  62 #include <pfkeyv2.h>
  63 #include <pfkey.h>
  64
  65 #include "freeswan/ipsec_proto.h"
  66
  67
  68 enum ipsec_life_alive
  69 ipsec_lifetime_check(struct ipsec_lifetime64 *il64,
  70                      const char *lifename,
  71                      const char *saname,
  72                      enum ipsec_life_type ilt,
  73                      enum ipsec_direction idir,
  74                      struct ipsec_sa *ips)
  75 {
  76         __u64 count;
  77         const char *dir;
  78
  79         if(saname == NULL) {
  80                 saname = "unknown-SA";
  81         }
  82
  83         if(idir == ipsec_incoming) {
  84                 dir = "incoming";
  85         } else {
  86                 dir = "outgoing";
  87         }
  88
  89
  90         if(ilt == ipsec_life_timebased) {
  91                 count = jiffies/HZ - il64->ipl_count;
  92         } else {
  93                 count = il64->ipl_count;
  94         }
  95
  96         if(il64->ipl_hard &&
  97            (count > il64->ipl_hard)) {
  98                 KLIPS_PRINT(debug_tunnel & DB_TN_XMIT,
  99                             "klips_debug:ipsec_lifetime_check: "
 100                             "hard %s lifetime of SA:<%s%s%s> %s has been reached, SA expired, "
 101                             "%s packet dropped.\n",
 102                             lifename,
 103                             IPS_XFORM_NAME(ips),
 104                             saname,
 105                             dir);
 106
 107                 pfkey_expire(ips, 1);
 108                 return ipsec_life_harddied;
 109         }
 110
 111         if(il64->ipl_soft &&
 112            (count > il64->ipl_soft)) {
 113                 KLIPS_PRINT(debug_tunnel & DB_TN_XMIT,
 114                             "klips_debug:ipsec_lifetime_check: "
 115                             "soft %s lifetime of SA:<%s%s%s> %s has been reached, SA expiring, "
 116                             "soft expire message sent up, %s packet still processed.\n",
 117                             lifename,
 118                             IPS_XFORM_NAME(ips),
 119                             saname,
 120                             dir);
 121
 122                 if(ips->ips_state != SADB_SASTATE_DYING) {
 123                         pfkey_expire(ips, 0);
 124                 }
 125                 ips->ips_state = SADB_SASTATE_DYING;
 126
 127                 return ipsec_life_softdied;
 128         }
 129         return ipsec_life_okay;
 130 }
 131
 132
 133 /*
 134  * This function takes a buffer (with length), a lifetime name and type,
 135  * and formats a string to represent the current values of the lifetime.
 136  *
 137  * It returns the number of bytes that the format took (or would take,
 138  * if the buffer were large enough: snprintf semantics).
 139  * This is used in /proc routines and in debug output.
 140  */
 141 int
 142 ipsec_lifetime_format(char *buffer,
 143                       int   buflen,
 144                       char *lifename,
 145                       enum ipsec_life_type timebaselife,
 146                       struct ipsec_lifetime64 *lifetime)
 147 {
 148         int len = 0;
 149         __u64 count;
 150
 151         if(timebaselife == ipsec_life_timebased) {
 152                 count = jiffies/HZ - lifetime->ipl_count;
 153         } else {
 154                 count = lifetime->ipl_count;
 155         }
 156
 157         if(lifetime->ipl_count > 1 ||
 158            lifetime->ipl_soft      ||
 159            lifetime->ipl_hard) {
 160 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,0))
 161                 len = ipsec_snprintf(buffer, buflen,
 162                                "%s(%Lu,%Lu,%Lu)",
 163                                lifename,
 164                                count,
 165                                lifetime->ipl_soft,
 166                                lifetime->ipl_hard);
 167 #else /* XXX high 32 bits are not displayed */
 168                 len = ipsec_snprintf(buffer, buflen,
 169                                 "%s(%lu,%lu,%lu)",
 170                                 lifename,
 171                                 (unsigned long)count,
 172                                 (unsigned long)lifetime->ipl_soft,
 173                                 (unsigned long)lifetime->ipl_hard);
 174 #endif
 175         }
 176
 177         return len;
 178 }
 179
 180 void
 181 ipsec_lifetime_update_hard(struct ipsec_lifetime64 *lifetime,
 182                           __u64 newvalue)
 183 {
 184         if(newvalue &&
 185            (!lifetime->ipl_hard ||
 186             (newvalue < lifetime->ipl_hard))) {
 187                 lifetime->ipl_hard = newvalue;
 188
 189                 if(!lifetime->ipl_soft &&
 190                    (lifetime->ipl_hard < lifetime->ipl_soft)) {
 191                         lifetime->ipl_soft = lifetime->ipl_hard;
 192                 }
 193         }
 194 }
 195
 196 void
 197 ipsec_lifetime_update_soft(struct ipsec_lifetime64 *lifetime,
 198                           __u64 newvalue)
 199 {
 200         if(newvalue &&
 201            (!lifetime->ipl_soft ||
 202             (newvalue < lifetime->ipl_soft))) {
 203                 lifetime->ipl_soft = newvalue;
 204
 205                 if(lifetime->ipl_hard &&
 206                    (lifetime->ipl_hard < lifetime->ipl_soft)) {
 207                         lifetime->ipl_soft = lifetime->ipl_hard;
 208                 }
 209         }
 210 }