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 && 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(xfrm_address_t *daddr, u32 spi, u8 proto)
  68 {
  69         unsigned h = __xfrm6_spi_hash(daddr, spi, proto);
  70         struct xfrm_state *x;
  71
  72         list_for_each_entry(x, xfrm6_state_afinfo.state_byspi+h, byspi) {
  73                 if (x->props.family == AF_INET6 &&
  74                     spi == x->id.spi &&
  75                     ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)x->id.daddr.a6) &&
  76                     proto == x->id.proto) {
  77                         xfrm_state_hold(x);
  78                         return x;
  79                 }
  80         }
  81         return NULL;
  82 }
  83
  84 static struct xfrm_state *
  85 __xfrm6_find_acq(u8 mode, u32 reqid, u8 proto,
  86                  xfrm_address_t *daddr, xfrm_address_t *saddr,
  87                  int create)
  88 {
  89         struct xfrm_state *x, *x0;
  90         unsigned h = __xfrm6_dst_hash(daddr);
  91
  92         x0 = NULL;
  93
  94         list_for_each_entry(x, xfrm6_state_afinfo.state_bydst+h, bydst) {
  95                 if (x->props.family == AF_INET6 &&
  96                     ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)x->id.daddr.a6) &&
  97                     mode == x->props.mode &&
  98                     proto == x->id.proto &&
  99                     ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)x->props.saddr.a6) &&
 100                     reqid == x->props.reqid &&
 101                     x->km.state == XFRM_STATE_ACQ &&
 102                     !x->id.spi) {
 103                             x0 = x;
 104                             break;
 105                     }
 106         }
 107         if (!x0 && create && (x0 = xfrm_state_alloc()) != NULL) {
 108                 ipv6_addr_copy((struct in6_addr *)x0->sel.daddr.a6,
 109                                (struct in6_addr *)daddr);
 110                 ipv6_addr_copy((struct in6_addr *)x0->sel.saddr.a6,
 111                                (struct in6_addr *)saddr);
 112                 x0->sel.prefixlen_d = 128;
 113                 x0->sel.prefixlen_s = 128;
 114                 ipv6_addr_copy((struct in6_addr *)x0->props.saddr.a6,
 115                                (struct in6_addr *)saddr);
 116                 x0->km.state = XFRM_STATE_ACQ;
 117                 ipv6_addr_copy((struct in6_addr *)x0->id.daddr.a6,
 118                                (struct in6_addr *)daddr);
 119                 x0->id.proto = proto;
 120                 x0->props.family = AF_INET6;
 121                 x0->props.mode = mode;
 122                 x0->props.reqid = reqid;
 123                 x0->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES;
 124                 xfrm_state_hold(x0);
 125                 x0->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ;
 126                 add_timer(&x0->timer);
 127                 xfrm_state_hold(x0);
 128                 list_add_tail(&x0->bydst, xfrm6_state_afinfo.state_bydst+h);
 129                 wake_up(&km_waitq);
 130         }
 131         if (x0)
 132                 xfrm_state_hold(x0);
 133         return x0;
 134 }
 135
 136 static struct xfrm_state_afinfo xfrm6_state_afinfo = {
 137         .family                 = AF_INET6,
 138         .lock                   = RW_LOCK_UNLOCKED,
 139         .init_tempsel           = __xfrm6_init_tempsel,
 140         .state_lookup           = __xfrm6_state_lookup,
 141         .find_acq               = __xfrm6_find_acq,
 142 };
 143
 144 void __init xfrm6_state_init(void)
 145 {
 146         xfrm_state_register_afinfo(&xfrm6_state_afinfo);
 147 }
 148
 149 void xfrm6_state_fini(void)
 150 {
 151         xfrm_state_unregister_afinfo(&xfrm6_state_afinfo);
 152 }
 153