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
xfrm4_init_flags(struct xfrm_state * x)17 static int xfrm4_init_flags(struct xfrm_state *x)
18 {
19 if (ipv4_config.no_pmtu_disc)
20 x->props.flags |= XFRM_STATE_NOPMTUDISC;
21 return 0;
22 }
23
24 static void
__xfrm4_init_tempsel(struct xfrm_selector * sel,const struct flowi * fl)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
42 static void
xfrm4_init_temprop(struct xfrm_state * x,const struct xfrm_tmpl * tmpl,const xfrm_address_t * daddr,const xfrm_address_t * saddr)43 xfrm4_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
xfrm4_extract_header(struct sk_buff * skb)57 int 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
73 static 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 };
87
xfrm4_state_init(void)88 void __init xfrm4_state_init(void)
89 {
90 xfrm_state_register_afinfo(&xfrm4_state_afinfo);
91 }
92
93 #if 0
94 void __exit xfrm4_state_fini(void)
95 {
96 xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
97 }
98 #endif /* 0 */
99
100