net/ipv4/xfrm4_state.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * xfrm4_state.c
   4  *
   5  * Changes:
   6  *      YOSHIFUJI Hideaki @USAGI
   7  *              Split up af-specific portion
   8  *
   9  */
  10
  11 #include <net/ip.h>
  12 #include <net/xfrm.h>
  13 #include <linux/pfkeyv2.h>
  14 #include <linux/ipsec.h>
  15 #include <linux/netfilter_ipv4.h>
  16 #include <linux/export.h>
  17
  18 int xfrm4_extract_header(struct sk_buff *skb)
  19 {
  20         const struct iphdr *iph = ip_hdr(skb);
  21
  22         XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
  23         XFRM_MODE_SKB_CB(skb)->id = iph->id;
  24         XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
  25         XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
  26         XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
  27         XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph);
  28         memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
  29                sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
  30
  31         return 0;
  32 }
  33
  34 static struct xfrm_state_afinfo xfrm4_state_afinfo = {
  35         .family                 = AF_INET,
  36         .proto                  = IPPROTO_IPIP,
  37         .output                 = xfrm4_output,
  38         .output_finish          = xfrm4_output_finish,
  39         .extract_input          = xfrm4_extract_input,
  40         .extract_output         = xfrm4_extract_output,
  41         .transport_finish       = xfrm4_transport_finish,
  42         .local_error            = xfrm4_local_error,
  43 };
  44
  45 void __init xfrm4_state_init(void)
  46 {
  47         xfrm_state_register_afinfo(&xfrm4_state_afinfo);
  48 }