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   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 struct xfrm_state_afinfo xfrm4_state_afinfo;
  17
  18 static int xfrm4_init_flags(struct xfrm_state *x)
  19 {
  20         if (ipv4_config.no_pmtu_disc)
  21                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
  22         return 0;
  23 }
  24
  25 static void
  26 __xfrm4_init_tempsel(struct xfrm_state *x, struct flowi *fl,
  27                      struct xfrm_tmpl *tmpl,
  28                      xfrm_address_t *daddr, xfrm_address_t *saddr)
  29 {
  30         x->sel.daddr.a4 = fl->fl4_dst;
  31         x->sel.saddr.a4 = fl->fl4_src;
  32         x->sel.dport = xfrm_flowi_dport(fl);
  33         x->sel.dport_mask = htons(0xffff);
  34         x->sel.sport = xfrm_flowi_sport(fl);
  35         x->sel.sport_mask = htons(0xffff);
  36         x->sel.prefixlen_d = 32;
  37         x->sel.prefixlen_s = 32;
  38         x->sel.proto = fl->proto;
  39         x->sel.ifindex = fl->oif;
  40         x->id = tmpl->id;
  41         if (x->id.daddr.a4 == 0)
  42                 x->id.daddr.a4 = daddr->a4;
  43         x->props.saddr = tmpl->saddr;
  44         if (x->props.saddr.a4 == 0)
  45                 x->props.saddr.a4 = saddr->a4;
  46         x->props.mode = tmpl->mode;
  47         x->props.reqid = tmpl->reqid;
  48         x->props.family = AF_INET;
  49 }
  50
  51 int xfrm4_extract_header(struct sk_buff *skb)
  52 {
  53         struct iphdr *iph = ip_hdr(skb);
  54
  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         memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
  60                sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
  61
  62         return 0;
  63 }
  64
  65 static struct xfrm_state_afinfo xfrm4_state_afinfo = {
  66         .family                 = AF_INET,
  67         .proto                  = IPPROTO_IPIP,
  68         .eth_proto              = htons(ETH_P_IP),
  69         .nf_post_routing        = NF_INET_POST_ROUTING,
  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