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 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.family = AF_INET;
  37         x->sel.prefixlen_d = 32;
  38         x->sel.prefixlen_s = 32;
  39         x->sel.proto = fl->proto;
  40         x->sel.ifindex = fl->oif;
  41         x->id = tmpl->id;
  42         if (x->id.daddr.a4 == 0)
  43                 x->id.daddr.a4 = daddr->a4;
  44         x->props.saddr = tmpl->saddr;
  45         if (x->props.saddr.a4 == 0)
  46                 x->props.saddr.a4 = saddr->a4;
  47         x->props.mode = tmpl->mode;
  48         x->props.reqid = tmpl->reqid;
  49         x->props.family = AF_INET;
  50 }
  51
  52 int xfrm4_extract_header(struct sk_buff *skb)
  53 {
  54         struct iphdr *iph = ip_hdr(skb);
  55
  56         XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
  57         XFRM_MODE_SKB_CB(skb)->id = iph->id;
  58         XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
  59         XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
  60         XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
  61         XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph);
  62         memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
  63                sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
  64
  65         return 0;
  66 }
  67
  68 static struct xfrm_state_afinfo xfrm4_state_afinfo = {
  69         .family                 = AF_INET,
  70         .proto                  = IPPROTO_IPIP,
  71         .eth_proto              = htons(ETH_P_IP),
  72         .owner                  = THIS_MODULE,
  73         .init_flags             = xfrm4_init_flags,
  74         .init_tempsel           = __xfrm4_init_tempsel,
  75         .output                 = xfrm4_output,
  76         .extract_input          = xfrm4_extract_input,
  77         .extract_output         = xfrm4_extract_output,
  78         .transport_finish       = xfrm4_transport_finish,
  79 };
  80
  81 void __init xfrm4_state_init(void)
  82 {
  83         xfrm_state_register_afinfo(&xfrm4_state_afinfo);
  84 }
  85
  86 #if 0
  87 void __exit xfrm4_state_fini(void)
  88 {
  89         xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
  90 }
  91 #endif  /*  0  */
  92