xref: /openbmc/linux/net/ipv6/xfrm6_state.c (revision 6c33a6f4)
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