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 #include <linux/export.h>
  16
  17 static int xfrm4_init_flags(struct xfrm_state *x)
  18 {
  19         if (xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc)
  20                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
  21         return 0;
  22 }
  23
  24 static void
  25 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
  26 {
  27         const struct flowi4 *fl4 = &fl->u.ip4;
  28
  29         sel->daddr.a4 = fl4->daddr;
  30         sel->saddr.a4 = fl4->saddr;
  31         sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
  32         sel->dport_mask = htons(0xffff);
  33         sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
  34         sel->sport_mask = htons(0xffff);
  35         sel->family = AF_INET;
  36         sel->prefixlen_d = 32;
  37         sel->prefixlen_s = 32;
  38         sel->proto = fl4->flowi4_proto;
  39         sel->ifindex = fl4->flowi4_oif;
  40 }
  41
  42 static void
  43 xfrm4_init_temprop(struct xfrm_state *x, const struct xfrm_tmpl *tmpl,
  44                    const xfrm_address_t *daddr, const xfrm_address_t *saddr)
  45 {
  46         x->id = tmpl->id;
  47         if (x->id.daddr.a4 == 0)
  48                 x->id.daddr.a4 = daddr->a4;
  49         x->props.saddr = tmpl->saddr;
  50         if (x->props.saddr.a4 == 0)
  51                 x->props.saddr.a4 = saddr->a4;
  52         x->props.mode = tmpl->mode;
  53         x->props.reqid = tmpl->reqid;
  54         x->props.family = AF_INET;
  55 }
  56
  57 int xfrm4_extract_header(struct sk_buff *skb)
  58 {
  59         const struct iphdr *iph = ip_hdr(skb);
  60
  61         XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
  62         XFRM_MODE_SKB_CB(skb)->id = iph->id;
  63         XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
  64         XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
  65         XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
  66         XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph);
  67         memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
  68                sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
  69
  70         return 0;
  71 }
  72
  73 static struct xfrm_state_afinfo xfrm4_state_afinfo = {
  74         .family                 = AF_INET,
  75         .proto                  = IPPROTO_IPIP,
  76         .eth_proto              = htons(ETH_P_IP),
  77         .owner                  = THIS_MODULE,
  78         .init_flags             = xfrm4_init_flags,
  79         .init_tempsel           = __xfrm4_init_tempsel,
  80         .init_temprop           = xfrm4_init_temprop,
  81         .output                 = xfrm4_output,
  82         .output_finish          = xfrm4_output_finish,
  83         .extract_input          = xfrm4_extract_input,
  84         .extract_output         = xfrm4_extract_output,
  85         .transport_finish       = xfrm4_transport_finish,
  86         .local_error            = xfrm4_local_error,
  87 };
  88
  89 void __init xfrm4_state_init(void)
  90 {
  91         xfrm_state_register_afinfo(&xfrm4_state_afinfo);
  92 }