SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/ipv6/xfrm6_state.c

   1 /*
   2  * xfrm6_state.c: based on xfrm4_state.c
   3  *
   4  * Authors:
   5  *      Mitsuru KANDA @USAGI
   6  *      Kazunori MIYAZAWA @USAGI
   7  *      Kunihiro Ishiguro <kunihiro@ipinfusion.com>
   8  *              IPv6 support
   9  *      YOSHIFUJI Hideaki @USAGI
  10  *              Split up af-specific portion
  11  *
  12  */
  13
  14 #include <net/xfrm.h>
  15 #include <linux/pfkeyv2.h>
  16 #include <linux/ipsec.h>
  17 #include <net/ipv6.h>
  18 #include <net/addrconf.h>
  19
  20 static struct xfrm_state_afinfo xfrm6_state_afinfo;
  21
  22 static void
  23 __xfrm6_init_tempsel(struct xfrm_state *x, struct flowi *fl,
  24                      struct xfrm_tmpl *tmpl,
  25                      xfrm_address_t *daddr, xfrm_address_t *saddr)
  26 {
  27         /* Initialize temporary selector matching only
  28          * to current session. */
  29         ipv6_addr_copy((struct in6_addr *)&x->sel.daddr, &fl->fl6_dst);
  30         ipv6_addr_copy((struct in6_addr *)&x->sel.saddr, &fl->fl6_src);
  31         x->sel.dport = xfrm_flowi_dport(fl);
  32         x->sel.dport_mask = ~0;
  33         x->sel.sport = xfrm_flowi_sport(fl);
  34         x->sel.sport_mask = ~0;
  35         x->sel.prefixlen_d = 128;
  36         x->sel.prefixlen_s = 128;
  37         x->sel.proto = fl->proto;
  38         x->sel.ifindex = fl->oif;
  39         x->id = tmpl->id;
  40         if (ipv6_addr_any((struct in6_addr*)&x->id.daddr))
  41                 memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
  42         memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
  43         if (ipv6_addr_any((struct in6_addr*)&x->props.saddr))
  44                 memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
  45         if (tmpl->mode == XFRM_MODE_TUNNEL && ipv6_addr_any((struct in6_addr*)&x->props.saddr)) {
  46                 struct rt6_info *rt;
  47                 struct flowi fl_tunnel = {
  48                         .nl_u = {
  49                                 .ip6_u = {
  50                                         .daddr = *(struct in6_addr *)daddr,
  51                                 }
  52                         }
  53                 };
  54                 if (!xfrm_dst_lookup((struct xfrm_dst **)&rt,
  55                                      &fl_tunnel, AF_INET6)) {
  56                         ipv6_get_saddr(&rt->u.dst, (struct in6_addr *)daddr,
  57                                        (struct in6_addr *)&x->props.saddr);
  58                         dst_release(&rt->u.dst);
  59                 }
  60         }
  61         x->props.mode = tmpl->mode;
  62         x->props.reqid = tmpl->reqid;
  63         x->props.family = AF_INET6;
  64 }
  65
  66 static struct xfrm_state *
  67 __xfrm6_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr,
  68                             u8 proto)
  69 {
  70         struct xfrm_state *x = NULL;
  71         unsigned h;
  72
  73         h = __xfrm6_src_hash(saddr);
  74         list_for_each_entry(x, xfrm6_state_afinfo.state_bysrc+h, bysrc) {
  75                 if (x->props.family == AF_INET6 &&
  76                     ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)x->id.daddr.a6) &&
  77                     ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)x->props.saddr.a6) &&
  78                     proto == x->id.proto) {
  79                         xfrm_state_hold(x);
  80                         return x;
  81                 }
  82         }
  83         return NULL;
  84 }
  85
  86 static struct xfrm_state *
  87 __xfrm6_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto)
  88 {
  89         unsigned h = __xfrm6_spi_hash(daddr, spi, proto);
  90         struct xfrm_state *x;
  91
  92         list_for_each_entry(x, xfrm6_state_afinfo.state_byspi+h, byspi) {
  93                 if (x->props.family == AF_INET6 &&
  94                     spi == x->id.spi &&
  95                     ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)x->id.daddr.a6) &&
  96                     proto == x->id.proto) {
  97                         xfrm_state_hold(x);
  98                         return x;
  99                 }
 100         }
 101         return NULL;
 102 }
 103
 104 static struct xfrm_state *
 105 __xfrm6_find_acq(u8 mode, u32 reqid, u8 proto,
 106                  xfrm_address_t *daddr, xfrm_address_t *saddr,
 107                  int create)
 108 {
 109         struct xfrm_state *x, *x0;
 110         unsigned h = __xfrm6_dst_hash(daddr);
 111
 112         x0 = NULL;
 113
 114         list_for_each_entry(x, xfrm6_state_afinfo.state_bydst+h, bydst) {
 115                 if (x->props.family == AF_INET6 &&
 116                     ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)x->id.daddr.a6) &&
 117                     mode == x->props.mode &&
 118                     proto == x->id.proto &&
 119                     ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)x->props.saddr.a6) &&
 120                     reqid == x->props.reqid &&
 121                     x->km.state == XFRM_STATE_ACQ &&
 122                     !x->id.spi) {
 123                             x0 = x;
 124                             break;
 125                     }
 126         }
 127         if (!x0 && create && (x0 = xfrm_state_alloc()) != NULL) {
 128                 ipv6_addr_copy((struct in6_addr *)x0->sel.daddr.a6,
 129                                (struct in6_addr *)daddr);
 130                 ipv6_addr_copy((struct in6_addr *)x0->sel.saddr.a6,
 131                                (struct in6_addr *)saddr);
 132                 x0->sel.prefixlen_d = 128;
 133                 x0->sel.prefixlen_s = 128;
 134                 ipv6_addr_copy((struct in6_addr *)x0->props.saddr.a6,
 135                                (struct in6_addr *)saddr);
 136                 x0->km.state = XFRM_STATE_ACQ;
 137                 ipv6_addr_copy((struct in6_addr *)x0->id.daddr.a6,
 138                                (struct in6_addr *)daddr);
 139                 x0->id.proto = proto;
 140                 x0->props.family = AF_INET6;
 141                 x0->props.mode = mode;
 142                 x0->props.reqid = reqid;
 143                 x0->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES;
 144                 xfrm_state_hold(x0);
 145                 x0->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ;
 146                 add_timer(&x0->timer);
 147                 xfrm_state_hold(x0);
 148                 list_add_tail(&x0->bydst, xfrm6_state_afinfo.state_bydst+h);
 149                 h = __xfrm6_src_hash(saddr);
 150                 xfrm_state_hold(x0);
 151                 list_add_tail(&x0->bysrc, xfrm6_state_afinfo.state_bysrc+h);
 152                 wake_up(&km_waitq);
 153         }
 154         if (x0)
 155                 xfrm_state_hold(x0);
 156         return x0;
 157 }
 158
 159 static int
 160 __xfrm6_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n)
 161 {
 162         int i;
 163         int j = 0;
 164
 165         /* Rule 1: select IPsec transport except AH */
 166         for (i = 0; i < n; i++) {
 167                 if (src[i]->props.mode == XFRM_MODE_TRANSPORT &&
 168                     src[i]->id.proto != IPPROTO_AH) {
 169                         dst[j++] = src[i];
 170                         src[i] = NULL;
 171                 }
 172         }
 173         if (j == n)
 174                 goto end;
 175
 176         /* XXX: Rule 2: select MIPv6 RO or inbound trigger */
 177
 178         /* Rule 3: select IPsec transport AH */
 179         for (i = 0; i < n; i++) {
 180                 if (src[i] &&
 181                     src[i]->props.mode == XFRM_MODE_TRANSPORT &&
 182                     src[i]->id.proto == IPPROTO_AH) {
 183                         dst[j++] = src[i];
 184                         src[i] = NULL;
 185                 }
 186         }
 187         if (j == n)
 188                 goto end;
 189
 190         /* Rule 4: select IPsec tunnel */
 191         for (i = 0; i < n; i++) {
 192                 if (src[i] &&
 193                     src[i]->props.mode == XFRM_MODE_TUNNEL) {
 194                         dst[j++] = src[i];
 195                         src[i] = NULL;
 196                 }
 197         }
 198         if (likely(j == n))
 199                 goto end;
 200
 201         /* Final rule */
 202         for (i = 0; i < n; i++) {
 203                 if (src[i]) {
 204                         dst[j++] = src[i];
 205                         src[i] = NULL;
 206                 }
 207         }
 208
 209  end:
 210         return 0;
 211 }
 212
 213 static int
 214 __xfrm6_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n)
 215 {
 216         int i;
 217         int j = 0;
 218
 219         /* Rule 1: select IPsec transport */
 220         for (i = 0; i < n; i++) {
 221                 if (src[i]->mode == XFRM_MODE_TRANSPORT) {
 222                         dst[j++] = src[i];
 223                         src[i] = NULL;
 224                 }
 225         }
 226         if (j == n)
 227                 goto end;
 228
 229         /* XXX: Rule 2: select MIPv6 RO or inbound trigger */
 230
 231         /* Rule 3: select IPsec tunnel */
 232         for (i = 0; i < n; i++) {
 233                 if (src[i] &&
 234                     src[i]->mode == XFRM_MODE_TUNNEL) {
 235                         dst[j++] = src[i];
 236                         src[i] = NULL;
 237                 }
 238         }
 239         if (likely(j == n))
 240                 goto end;
 241
 242         /* Final rule */
 243         for (i = 0; i < n; i++) {
 244                 if (src[i]) {
 245                         dst[j++] = src[i];
 246                         src[i] = NULL;
 247                 }
 248         }
 249
 250  end:
 251         return 0;
 252 }
 253
 254 static struct xfrm_state_afinfo xfrm6_state_afinfo = {
 255         .family                 = AF_INET6,
 256         .init_tempsel           = __xfrm6_init_tempsel,
 257         .state_lookup           = __xfrm6_state_lookup,
 258         .state_lookup_byaddr    = __xfrm6_state_lookup_byaddr,
 259         .find_acq               = __xfrm6_find_acq,
 260         .tmpl_sort              = __xfrm6_tmpl_sort,
 261         .state_sort             = __xfrm6_state_sort,
 262 };
 263
 264 void __init xfrm6_state_init(void)
 265 {
 266         xfrm_state_register_afinfo(&xfrm6_state_afinfo);
 267 }
 268
 269 void xfrm6_state_fini(void)
 270 {
 271         xfrm_state_unregister_afinfo(&xfrm6_state_afinfo);
 272 }
 273