LXR linux/net/ipv4/xfrm4

   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
  16static 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
  23static 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
  50int 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
  66static 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
  79void __init xfrm4_state_init(void)
  80{
  81        xfrm_state_register_afinfo(&xfrm4_state_afinfo);
  82}
  83
  84#if 0
  85void __exit xfrm4_state_fini(void)
  86{
  87        xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
  88}
  89#endif  /*  0  */
  90
  91