net/ipv4/xfrm4_state.c

   1 /*
   2  * xfrm4_state.c
   3  *
   4  * Changes:
   5  *      YOSHIFUJI Hideaki @USAGI
   6  *              Split up af-specific portion
   7  *
   8  */
   9
  10 #include <net/xfrm.h>
  11 #include <linux/pfkeyv2.h>
  12 #include <linux/ipsec.h>
  13
  14 static struct xfrm_state_afinfo xfrm4_state_afinfo;
  15
  16 static void
  17 __xfrm4_init_tempsel(struct xfrm_state *x, struct flowi *fl,
  18                      struct xfrm_tmpl *tmpl,
  19                      xfrm_address_t *daddr, xfrm_address_t *saddr)
  20 {
  21         x->sel.daddr.a4 = fl->fl4_dst;
  22         x->sel.saddr.a4 = fl->fl4_src;
  23         x->sel.dport = xfrm_flowi_dport(fl);
  24         x->sel.dport_mask = ~0;
  25         x->sel.sport = xfrm_flowi_sport(fl);
  26         x->sel.sport_mask = ~0;
  27         x->sel.prefixlen_d = 32;
  28         x->sel.prefixlen_s = 32;
  29         x->sel.proto = fl->proto;
  30         x->sel.ifindex = fl->oif;
  31         x->id = tmpl->id;
  32         if (x->id.daddr.a4 == 0)
  33                 x->id.daddr.a4 = daddr->a4;
  34         x->props.saddr = tmpl->saddr;
  35         if (x->props.saddr.a4 == 0)
  36                 x->props.saddr.a4 = saddr->a4;
  37         x->props.mode = tmpl->mode;
  38         x->props.reqid = tmpl->reqid;
  39         x->props.family = AF_INET;
  40 }
  41
  42 static struct xfrm_state *
  43 __xfrm4_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto)
  44 {
  45         unsigned h = __xfrm4_spi_hash(daddr, spi, proto);
  46         struct xfrm_state *x;
  47
  48         list_for_each_entry(x, xfrm4_state_afinfo.state_byspi+h, byspi) {
  49                 if (x->props.family == AF_INET &&
  50                     spi == x->id.spi &&
  51                     daddr->a4 == x->id.daddr.a4 &&
  52                     proto == x->id.proto) {
  53                         xfrm_state_hold(x);
  54                         return x;
  55                 }
  56         }
  57         return NULL;
  58 }
  59
  60 static struct xfrm_state *
  61 __xfrm4_find_acq(u8 mode, u32 reqid, u8 proto,
  62                  xfrm_address_t *daddr, xfrm_address_t *saddr,
  63                  int create)
  64 {
  65         struct xfrm_state *x, *x0;
  66         unsigned h = __xfrm4_dst_hash(daddr);
  67
  68         x0 = NULL;
  69
  70         list_for_each_entry(x, xfrm4_state_afinfo.state_bydst+h, bydst) {
  71                 if (x->props.family == AF_INET &&
  72                     daddr->a4 == x->id.daddr.a4 &&
  73                     mode == x->props.mode &&
  74                     proto == x->id.proto &&
  75                     saddr->a4 == x->props.saddr.a4 &&
  76                     reqid == x->props.reqid &&
  77                     x->km.state == XFRM_STATE_ACQ &&
  78                     !x->id.spi) {
  79                             x0 = x;
  80                             break;
  81                     }
  82         }
  83         if (!x0 && create && (x0 = xfrm_state_alloc()) != NULL) {
  84                 x0->sel.daddr.a4 = daddr->a4;
  85                 x0->sel.saddr.a4 = saddr->a4;
  86                 x0->sel.prefixlen_d = 32;
  87                 x0->sel.prefixlen_s = 32;
  88                 x0->props.saddr.a4 = saddr->a4;
  89                 x0->km.state = XFRM_STATE_ACQ;
  90                 x0->id.daddr.a4 = daddr->a4;
  91                 x0->id.proto = proto;
  92                 x0->props.family = AF_INET;
  93                 x0->props.mode = mode;
  94                 x0->props.reqid = reqid;
  95                 x0->props.family = AF_INET;
  96                 x0->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES;
  97                 xfrm_state_hold(x0);
  98                 x0->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ;
  99                 add_timer(&x0->timer);
 100                 xfrm_state_hold(x0);
 101                 list_add_tail(&x0->bydst, xfrm4_state_afinfo.state_bydst+h);
 102                 wake_up(&km_waitq);
 103         }
 104         if (x0)
 105                 xfrm_state_hold(x0);
 106         return x0;
 107 }
 108
 109 static struct xfrm_state_afinfo xfrm4_state_afinfo = {
 110         .family                 = AF_INET,
 111         .lock                   = RW_LOCK_UNLOCKED,
 112         .init_tempsel           = __xfrm4_init_tempsel,
 113         .state_lookup           = __xfrm4_state_lookup,
 114         .find_acq               = __xfrm4_find_acq,
 115 };
 116
 117 void __init xfrm4_state_init(void)
 118 {
 119         xfrm_state_register_afinfo(&xfrm4_state_afinfo);
 120 }
 121
 122 void __exit xfrm4_state_fini(void)
 123 {
 124         xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
 125 }
 126