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_state *x, struct flowi *fl,
  25                      struct xfrm_tmpl *tmpl,
  26                      xfrm_address_t *daddr, xfrm_address_t *saddr)
  27 {
  28         x->sel.daddr.a4 = fl->fl4_dst;
  29         x->sel.saddr.a4 = fl->fl4_src;
  30         x->sel.dport = xfrm_flowi_dport(fl);
  31         x->sel.dport_mask = htons(0xffff);
  32         x->sel.sport = xfrm_flowi_sport(fl);
  33         x->sel.sport_mask = htons(0xffff);
  34         x->sel.family = AF_INET;
  35         x->sel.prefixlen_d = 32;
  36         x->sel.prefixlen_s = 32;
  37         x->sel.proto = fl->proto;
  38         x->sel.ifindex = fl->oif;
  39         x->id = tmpl->id;
  40         if (x->id.daddr.a4 == 0)
  41                 x->id.daddr.a4 = daddr->a4;
  42         x->props.saddr = tmpl->saddr;
  43         if (x->props.saddr.a4 == 0)
  44                 x->props.saddr.a4 = saddr->a4;
  45         x->props.mode = tmpl->mode;
  46         x->props.reqid = tmpl->reqid;
  47         x->props.family = AF_INET;
  48 }
  49
  50 int xfrm4_extract_header(struct sk_buff *skb)
  51 {
  52         struct iphdr *iph = ip_hdr(skb);
  53
  54         XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
  55         XFRM_MODE_SKB_CB(skb)->id = iph->id;
  56         XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
  57         XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
  58         XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
  59         XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph);
  60         memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
  61                sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
  62
  63         return 0;
  64 }
  65
  66 static struct xfrm_state_afinfo xfrm4_state_afinfo = {
  67         .family                 = AF_INET,
  68         .proto                  = IPPROTO_IPIP,
  69         .eth_proto              = htons(ETH_P_IP),
  70         .owner                  = THIS_MODULE,
  71         .init_flags             = xfrm4_init_flags,
  72         .init_tempsel           = __xfrm4_init_tempsel,
  73         .output                 = xfrm4_output,
  74         .extract_input          = xfrm4_extract_input,
  75         .extract_output         = xfrm4_extract_output,
  76         .transport_finish       = xfrm4_transport_finish,
  77 };
  78
  79 void __init xfrm4_state_init(void)
  80 {
  81         xfrm_state_register_afinfo(&xfrm4_state_afinfo);
  82 }
  83
  84 #if 0
  85 void __exit xfrm4_state_fini(void)
  86 {
  87         xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
  88 }
  89 #endif  /*  0  */
  90