net/ipv6/xfrm6_state.c

   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 }