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
  19 static struct xfrm_state_afinfo xfrm6_state_afinfo;
  20
  21 static void
  22 __xfrm6_init_tempsel(struct xfrm_state *x, struct flowi *fl,
  23                      struct xfrm_tmpl *tmpl,
  24                      xfrm_address_t *daddr, xfrm_address_t *saddr)
  25 {
  26         /* Initialize temporary selector matching only
  27          * to current session. */
  28         ipv6_addr_copy((struct in6_addr *)&x->sel.daddr, &fl->fl6_dst);
  29         ipv6_addr_copy((struct in6_addr *)&x->sel.saddr, &fl->fl6_src);
  30         x->sel.dport = xfrm_flowi_dport(fl);
  31         x->sel.dport_mask = ~0;
  32         x->sel.sport = xfrm_flowi_sport(fl);
  33         x->sel.sport_mask = ~0;
  34         x->sel.prefixlen_d = 128;
  35         x->sel.prefixlen_s = 128;
  36         x->sel.proto = fl->proto;
  37         x->sel.ifindex = fl->oif;
  38         x->id = tmpl->id;
  39         if (ipv6_addr_any((struct in6_addr*)&x->id.daddr))
  40                 memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
  41         memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
  42         if (ipv6_addr_any((struct in6_addr*)&x->props.saddr))
  43                 memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
  44         x->props.mode = tmpl->mode;
  45         x->props.reqid = tmpl->reqid;
  46         x->props.family = AF_INET6;
  47 }
  48
  49 static struct xfrm_state *
  50 __xfrm6_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto)
  51 {
  52         unsigned h = __xfrm6_spi_hash(daddr, spi, proto);
  53         struct xfrm_state *x;
  54
  55         list_for_each_entry(x, xfrm6_state_afinfo.state_byspi+h, byspi) {
  56                 if (x->props.family == AF_INET6 &&
  57                     spi == x->id.spi &&
  58                     ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)x->id.daddr.a6) &&
  59                     proto == x->id.proto) {
  60                         xfrm_state_hold(x);
  61                         return x;
  62                 }
  63         }
  64         return NULL;
  65 }
  66
  67 static struct xfrm_state *
  68 __xfrm6_find_acq(u8 mode, u32 reqid, u8 proto,
  69                  xfrm_address_t *daddr, xfrm_address_t *saddr,
  70                  int create)
  71 {
  72         struct xfrm_state *x, *x0;
  73         unsigned h = __xfrm6_dst_hash(daddr);
  74
  75         x0 = NULL;
  76
  77         list_for_each_entry(x, xfrm6_state_afinfo.state_bydst+h, bydst) {
  78                 if (x->props.family == AF_INET6 &&
  79                     ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)x->id.daddr.a6) &&
  80                     mode == x->props.mode &&
  81                     proto == x->id.proto &&
  82                     ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)x->props.saddr.a6) &&
  83                     reqid == x->props.reqid &&
  84                     x->km.state == XFRM_STATE_ACQ &&
  85                     !x->id.spi) {
  86                             x0 = x;
  87                             break;
  88                     }
  89         }
  90         if (!x0 && create && (x0 = xfrm_state_alloc()) != NULL) {
  91                 ipv6_addr_copy((struct in6_addr *)x0->sel.daddr.a6,
  92                                (struct in6_addr *)daddr);
  93                 ipv6_addr_copy((struct in6_addr *)x0->sel.saddr.a6,
  94                                (struct in6_addr *)saddr);
  95                 x0->sel.prefixlen_d = 128;
  96                 x0->sel.prefixlen_s = 128;
  97                 ipv6_addr_copy((struct in6_addr *)x0->props.saddr.a6,
  98                                (struct in6_addr *)saddr);
  99                 x0->km.state = XFRM_STATE_ACQ;
 100                 ipv6_addr_copy((struct in6_addr *)x0->id.daddr.a6,
 101                                (struct in6_addr *)daddr);
 102                 x0->id.proto = proto;
 103                 x0->props.family = AF_INET6;
 104                 x0->props.mode = mode;
 105                 x0->props.reqid = reqid;
 106                 x0->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES;
 107                 xfrm_state_hold(x0);
 108                 x0->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ;
 109                 add_timer(&x0->timer);
 110                 xfrm_state_hold(x0);
 111                 list_add_tail(&x0->bydst, xfrm6_state_afinfo.state_bydst+h);
 112                 wake_up(&km_waitq);
 113         }
 114         if (x0)
 115                 xfrm_state_hold(x0);
 116         return x0;
 117 }
 118
 119 static struct xfrm_state_afinfo xfrm6_state_afinfo = {
 120         .family                 = AF_INET6,
 121         .lock                   = RW_LOCK_UNLOCKED,
 122         .init_tempsel           = __xfrm6_init_tempsel,
 123         .state_lookup           = __xfrm6_state_lookup,
 124         .find_acq               = __xfrm6_find_acq,
 125 };
 126
 127 void __init xfrm6_state_init(void)
 128 {
 129         xfrm_state_register_afinfo(&xfrm6_state_afinfo);
 130 }
 131
 132 void xfrm6_state_fini(void)
 133 {
 134         xfrm_state_unregister_afinfo(&xfrm6_state_afinfo);
 135 }
 136