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
18static int xfrm4_init_flags(struct xfrm_state *x)
19{
20	if (xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc)
21		x->props.flags |= XFRM_STATE_NOPMTUDISC;
22	return 0;
23}
24
25static void
26__xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
27{
28	const struct flowi4 *fl4 = &fl->u.ip4;
29
30	sel->daddr.a4 = fl4->daddr;
31	sel->saddr.a4 = fl4->saddr;
32	sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
33	sel->dport_mask = htons(0xffff);
34	sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
35	sel->sport_mask = htons(0xffff);
36	sel->family = AF_INET;
37	sel->prefixlen_d = 32;
38	sel->prefixlen_s = 32;
39	sel->proto = fl4->flowi4_proto;
40	sel->ifindex = fl4->flowi4_oif;
41}
42
43static void
44xfrm4_init_temprop(struct xfrm_state *x, const struct xfrm_tmpl *tmpl,
45		   const xfrm_address_t *daddr, const xfrm_address_t *saddr)
46{
47	x->id = tmpl->id;
48	if (x->id.daddr.a4 == 0)
49		x->id.daddr.a4 = daddr->a4;
50	x->props.saddr = tmpl->saddr;
51	if (x->props.saddr.a4 == 0)
52		x->props.saddr.a4 = saddr->a4;
53	x->props.mode = tmpl->mode;
54	x->props.reqid = tmpl->reqid;
55	x->props.family = AF_INET;
56}
57
58int xfrm4_extract_header(struct sk_buff *skb)
59{
60	const struct iphdr *iph = ip_hdr(skb);
61
62	XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
63	XFRM_MODE_SKB_CB(skb)->id = iph->id;
64	XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
65	XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
66	XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
67	XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph);
68	memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
69	       sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
70
71	return 0;
72}
73
74static struct xfrm_state_afinfo xfrm4_state_afinfo = {
75	.family			= AF_INET,
76	.proto			= IPPROTO_IPIP,
77	.eth_proto		= htons(ETH_P_IP),
78	.owner			= THIS_MODULE,
79	.init_flags		= xfrm4_init_flags,
80	.init_tempsel		= __xfrm4_init_tempsel,
81	.init_temprop		= xfrm4_init_temprop,
82	.output			= xfrm4_output,
83	.output_finish		= xfrm4_output_finish,
84	.extract_input		= xfrm4_extract_input,
85	.extract_output		= xfrm4_extract_output,
86	.transport_finish	= xfrm4_transport_finish,
87	.local_error		= xfrm4_local_error,
88};
89
90void __init xfrm4_state_init(void)
91{
92	xfrm_state_register_afinfo(&xfrm4_state_afinfo);
93}

 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/xfrm.h>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
12
13static struct xfrm_state_afinfo xfrm4_state_afinfo = {
14	.family			= AF_INET,
15	.proto			= IPPROTO_IPIP,
 
 
 
 
 
16	.output			= xfrm4_output,
 
 
 
17	.transport_finish	= xfrm4_transport_finish,
18	.local_error		= xfrm4_local_error,
19};
20
21void __init xfrm4_state_init(void)
22{
23	xfrm_state_register_afinfo(&xfrm4_state_afinfo);
24}