1/*
2 * xfrm4_state.c
3 *
4 * Changes:
5 * 	YOSHIFUJI Hideaki @USAGI
6 * 		Split up af-specific portion
7 *
8 */
9
10#include <net/ip.h>
11#include <net/xfrm.h>
12#include <linux/pfkeyv2.h>
13#include <linux/ipsec.h>
14#include <linux/netfilter_ipv4.h>
15#include <linux/export.h>
16
17static int xfrm4_init_flags(struct xfrm_state *x)
18{
19	if (xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc)
20		x->props.flags |= XFRM_STATE_NOPMTUDISC;
21	return 0;
22}
23
24static void
25__xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
26{
27	const struct flowi4 *fl4 = &fl->u.ip4;
28
29	sel->daddr.a4 = fl4->daddr;
30	sel->saddr.a4 = fl4->saddr;
31	sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
32	sel->dport_mask = htons(0xffff);
33	sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
34	sel->sport_mask = htons(0xffff);
35	sel->family = AF_INET;
36	sel->prefixlen_d = 32;
37	sel->prefixlen_s = 32;
38	sel->proto = fl4->flowi4_proto;
39	sel->ifindex = fl4->flowi4_oif;
40}
41
42static void
43xfrm4_init_temprop(struct xfrm_state *x, const struct xfrm_tmpl *tmpl,
44		   const xfrm_address_t *daddr, const xfrm_address_t *saddr)
45{
46	x->id = tmpl->id;
47	if (x->id.daddr.a4 == 0)
48		x->id.daddr.a4 = daddr->a4;
49	x->props.saddr = tmpl->saddr;
50	if (x->props.saddr.a4 == 0)
51		x->props.saddr.a4 = saddr->a4;
52	x->props.mode = tmpl->mode;
53	x->props.reqid = tmpl->reqid;
54	x->props.family = AF_INET;
55}
56
57int xfrm4_extract_header(struct sk_buff *skb)
58{
59	const struct iphdr *iph = ip_hdr(skb);
60
61	XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
62	XFRM_MODE_SKB_CB(skb)->id = iph->id;
63	XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
64	XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
65	XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
66	XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph);
67	memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
68	       sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
69
70	return 0;
71}
72
73static struct xfrm_state_afinfo xfrm4_state_afinfo = {
74	.family			= AF_INET,
75	.proto			= IPPROTO_IPIP,
76	.eth_proto		= htons(ETH_P_IP),
77	.owner			= THIS_MODULE,
78	.init_flags		= xfrm4_init_flags,
79	.init_tempsel		= __xfrm4_init_tempsel,
80	.init_temprop		= xfrm4_init_temprop,
81	.output			= xfrm4_output,
82	.output_finish		= xfrm4_output_finish,
83	.extract_input		= xfrm4_extract_input,
84	.extract_output		= xfrm4_extract_output,
85	.transport_finish	= xfrm4_transport_finish,
86	.local_error		= xfrm4_local_error,
87};
88
89void __init xfrm4_state_init(void)
90{
91	xfrm_state_register_afinfo(&xfrm4_state_afinfo);
92}
93
94#if 0
95void __exit xfrm4_state_fini(void)
96{
97	xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
98}
99#endif  /*  0  */
100
101