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Linux/net/ipv4/xfrm4_state.c

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  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 }
 49 

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