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_selector *sel, struct flowi *fl)
  25{
  26        sel->daddr.a4 = fl->fl4_dst;
  27        sel->saddr.a4 = fl->fl4_src;
  28        sel->dport = xfrm_flowi_dport(fl);
  29        sel->dport_mask = htons(0xffff);
  30        sel->sport = xfrm_flowi_sport(fl);
  31        sel->sport_mask = htons(0xffff);
  32        sel->family = AF_INET;
  33        sel->prefixlen_d = 32;
  34        sel->prefixlen_s = 32;
  35        sel->proto = fl->proto;
  36        sel->ifindex = fl->oif;
  37}
  38
  39static void
  40xfrm4_init_temprop(struct xfrm_state *x, struct xfrm_tmpl *tmpl,
  41                   xfrm_address_t *daddr, xfrm_address_t *saddr)
  42{
  43        x->id = tmpl->id;
  44        if (x->id.daddr.a4 == 0)
  45                x->id.daddr.a4 = daddr->a4;
  46        x->props.saddr = tmpl->saddr;
  47        if (x->props.saddr.a4 == 0)
  48                x->props.saddr.a4 = saddr->a4;
  49        x->props.mode = tmpl->mode;
  50        x->props.reqid = tmpl->reqid;
  51        x->props.family = AF_INET;
  52}
  53
  54int xfrm4_extract_header(struct sk_buff *skb)
  55{
  56        struct iphdr *iph = ip_hdr(skb);
  57
  58        XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
  59        XFRM_MODE_SKB_CB(skb)->id = iph->id;
  60        XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
  61        XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
  62        XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
  63        XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph);
  64        memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
  65               sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
  66
  67        return 0;
  68}
  69
  70static struct xfrm_state_afinfo xfrm4_state_afinfo = {
  71        .family                 = AF_INET,
  72        .proto                  = IPPROTO_IPIP,
  73        .eth_proto              = htons(ETH_P_IP),
  74        .owner                  = THIS_MODULE,
  75        .init_flags             = xfrm4_init_flags,
  76        .init_tempsel           = __xfrm4_init_tempsel,
  77        .init_temprop           = xfrm4_init_temprop,
  78        .output                 = xfrm4_output,
  79        .extract_input          = xfrm4_extract_input,
  80        .extract_output         = xfrm4_extract_output,
  81        .transport_finish       = xfrm4_transport_finish,
  82};
  83
  84void __init xfrm4_state_init(void)
  85{
  86        xfrm_state_register_afinfo(&xfrm4_state_afinfo);
  87}
  88
  89#if 0
  90void __exit xfrm4_state_fini(void)
  91{
  92        xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
  93}
  94#endif  /*  0  */
  95
  96