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Linux/net/ipv6/xfrm6_state.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * xfrm6_state.c: based on xfrm4_state.c
  4  *
  5  * Authors:
  6  *      Mitsuru KANDA @USAGI
  7  *      Kazunori MIYAZAWA @USAGI
  8  *      Kunihiro Ishiguro <kunihiro@ipinfusion.com>
  9  *              IPv6 support
 10  *      YOSHIFUJI Hideaki @USAGI
 11  *              Split up af-specific portion
 12  *
 13  */
 14 
 15 #include <net/xfrm.h>
 16 #include <linux/pfkeyv2.h>
 17 #include <linux/ipsec.h>
 18 #include <linux/netfilter_ipv6.h>
 19 #include <linux/export.h>
 20 #include <net/dsfield.h>
 21 #include <net/ipv6.h>
 22 #include <net/addrconf.h>
 23 
 24 int xfrm6_extract_header(struct sk_buff *skb)
 25 {
 26         struct ipv6hdr *iph = ipv6_hdr(skb);
 27 
 28         XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
 29         XFRM_MODE_SKB_CB(skb)->id = 0;
 30         XFRM_MODE_SKB_CB(skb)->frag_off = htons(IP_DF);
 31         XFRM_MODE_SKB_CB(skb)->tos = ipv6_get_dsfield(iph);
 32         XFRM_MODE_SKB_CB(skb)->ttl = iph->hop_limit;
 33         XFRM_MODE_SKB_CB(skb)->optlen = 0;
 34         memcpy(XFRM_MODE_SKB_CB(skb)->flow_lbl, iph->flow_lbl,
 35                sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
 36 
 37         return 0;
 38 }
 39 
 40 static struct xfrm_state_afinfo xfrm6_state_afinfo = {
 41         .family                 = AF_INET6,
 42         .proto                  = IPPROTO_IPV6,
 43         .output                 = xfrm6_output,
 44         .output_finish          = xfrm6_output_finish,
 45         .extract_input          = xfrm6_extract_input,
 46         .extract_output         = xfrm6_extract_output,
 47         .transport_finish       = xfrm6_transport_finish,
 48         .local_error            = xfrm6_local_error,
 49 };
 50 
 51 int __init xfrm6_state_init(void)
 52 {
 53         return xfrm_state_register_afinfo(&xfrm6_state_afinfo);
 54 }
 55 
 56 void xfrm6_state_fini(void)
 57 {
 58         xfrm_state_unregister_afinfo(&xfrm6_state_afinfo);
 59 }
 60 

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