LXR linux/net/ipv4/xfrm4

   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
  18int 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
  34static 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
  45void __init xfrm4_state_init(void)
  46{
  47        xfrm_state_register_afinfo(&xfrm4_state_afinfo);
  48}
  49