release/src-rt-6.x.4708/linux/linux-2.6.36/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/ip.h>
  11 #include <net/xfrm.h>
  12 #include <linux/pfkeyv2.h>
  13 #include <linux/ipsec.h>
  14 #include <linux/netfilter_ipv4.h>
  15
  16 static int xfrm4_init_flags(struct xfrm_state *x)
  17 {
  18         if (ipv4_config.no_pmtu_disc)
  19                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
  20         return 0;
  21 }
  22
  23 static void
  24 __xfrm4_init_tempsel(struct xfrm_selector *sel, struct flowi *fl)
  25 {
  26         sel->daddr.a4 = fl->fl4_dst;
  27         sel->saddr.a4 = fl->fl4_src;
  28         sel->dport = xfrm_flowi_dport(fl);
  29         sel->dport_mask = htons(0xffff);
  30         sel->sport = xfrm_flowi_sport(fl);
  31         sel->sport_mask = htons(0xffff);
  32         sel->family = AF_INET;
  33         sel->prefixlen_d = 32;
  34         sel->prefixlen_s = 32;
  35         sel->proto = fl->proto;
  36         sel->ifindex = fl->oif;
  37 }
  38
  39 static void
  40 xfrm4_init_temprop(struct xfrm_state *x, struct xfrm_tmpl *tmpl,
  41                    xfrm_address_t *daddr, xfrm_address_t *saddr)
  42 {
  43         x->id = tmpl->id;
  44         if (x->id.daddr.a4 == 0)
  45                 x->id.daddr.a4 = daddr->a4;
  46         x->props.saddr = tmpl->saddr;
  47         if (x->props.saddr.a4 == 0)
  48                 x->props.saddr.a4 = saddr->a4;
  49         x->props.mode = tmpl->mode;
  50         x->props.reqid = tmpl->reqid;
  51         x->props.family = AF_INET;
  52 }
  53
  54 int xfrm4_extract_header(struct sk_buff *skb)
  55 {
  56         struct iphdr *iph = ip_hdr(skb);
  57
  58         XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
  59         XFRM_MODE_SKB_CB(skb)->id = iph->id;
  60         XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
  61         XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
  62         XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
  63         XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph);
  64         memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
  65                sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
  66
  67         return 0;
  68 }
  69
  70 static struct xfrm_state_afinfo xfrm4_state_afinfo = {
  71         .family                 = AF_INET,
  72         .proto                  = IPPROTO_IPIP,
  73         .eth_proto              = htons(ETH_P_IP),
  74         .owner                  = THIS_MODULE,
  75         .init_flags             = xfrm4_init_flags,
  76         .init_tempsel           = __xfrm4_init_tempsel,
  77         .init_temprop           = xfrm4_init_temprop,
  78         .output                 = xfrm4_output,
  79         .extract_input          = xfrm4_extract_input,
  80         .extract_output         = xfrm4_extract_output,
  81         .transport_finish       = xfrm4_transport_finish,
  82 };
  83
  84 void __init xfrm4_state_init(void)
  85 {
  86         xfrm_state_register_afinfo(&xfrm4_state_afinfo);
  87 }