linux/net/ipv4/xfrm4_state.c
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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#include <linux/export.h>
  16
  17static int xfrm4_init_flags(struct xfrm_state *x)
  18{
  19        if (ipv4_config.no_pmtu_disc)
  20                x->props.flags |= XFRM_STATE_NOPMTUDISC;
  21        return 0;
  22}
  23
  24static 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
  42static void
  43xfrm4_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
  57int 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
  73static 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};
  87
  88void __init xfrm4_state_init(void)
  89{
  90        xfrm_state_register_afinfo(&xfrm4_state_afinfo);
  91}
  92
  93#if 0
  94void __exit xfrm4_state_fini(void)
  95{
  96        xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
  97}
  98#endif  /*  0  */
  99
 100
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