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, const struct flowi *fl)
  25 {
  26         const struct flowi4 *fl4 = &fl->u.ip4;
  27
  28         sel->daddr.a4 = fl4->daddr;
  29         sel->saddr.a4 = fl4->saddr;
  30         sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
  31         sel->dport_mask = htons(0xffff);
  32         sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
  33         sel->sport_mask = htons(0xffff);
  34         sel->family = AF_INET;
  35         sel->prefixlen_d = 32;
  36         sel->prefixlen_s = 32;
  37         sel->proto = fl4->flowi4_proto;
  38         sel->ifindex = fl4->flowi4_oif;
  39 }
  40
  41 static void
  42 xfrm4_init_temprop(struct xfrm_state *x, const struct xfrm_tmpl *tmpl,
  43                    const xfrm_address_t *daddr, const xfrm_address_t *saddr)
  44 {
  45         x->id = tmpl->id;
  46         if (x->id.daddr.a4 == 0)
  47                 x->id.daddr.a4 = daddr->a4;
  48         x->props.saddr = tmpl->saddr;
  49         if (x->props.saddr.a4 == 0)
  50                 x->props.saddr.a4 = saddr->a4;
  51         x->props.mode = tmpl->mode;
  52         x->props.reqid = tmpl->reqid;
  53         x->props.family = AF_INET;
  54 }
  55
  56 int xfrm4_extract_header(struct sk_buff *skb)
  57 {
  58         const struct iphdr *iph = ip_hdr(skb);
  59
  60         XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
  61         XFRM_MODE_SKB_CB(skb)->id = iph->id;
  62         XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
  63         XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
  64         XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
  65         XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph);
  66         memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
  67                sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
  68
  69         return 0;
  70 }
  71
  72 static struct xfrm_state_afinfo xfrm4_state_afinfo = {
  73         .family                 = AF_INET,
  74         .proto                  = IPPROTO_IPIP,
  75         .eth_proto              = htons(ETH_P_IP),
  76         .owner                  = THIS_MODULE,
  77         .init_flags             = xfrm4_init_flags,
  78         .init_tempsel           = __xfrm4_init_tempsel,
  79         .init_temprop           = xfrm4_init_temprop,
  80         .output                 = xfrm4_output,
  81         .extract_input          = xfrm4_extract_input,
  82         .extract_output         = xfrm4_extract_output,
  83         .transport_finish       = xfrm4_transport_finish,
  84 };
  85
  86 void __init xfrm4_state_init(void)
  87 {
  88         xfrm_state_register_afinfo(&xfrm4_state_afinfo);
  89 }
  90
  91 #if 0
  92 void __exit xfrm4_state_fini(void)
  93 {
  94         xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
  95 }
  96 #endif  /*  0  */
  97