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
xfrm4_init_flags(struct xfrm_state * x)16 static int xfrm4_init_flags(struct xfrm_state *x)
17 {
18 if (ipv4_config.no_pmtu_disc)
19 x->props.flags |= XFRM_STATE_NOPMTUDISC;
20 return 0;
21 }
22
23 static void
__xfrm4_init_tempsel(struct xfrm_state * x,struct flowi * fl,struct xfrm_tmpl * tmpl,xfrm_address_t * daddr,xfrm_address_t * saddr)24 __xfrm4_init_tempsel(struct xfrm_state *x, struct flowi *fl,
25 struct xfrm_tmpl *tmpl,
26 xfrm_address_t *daddr, xfrm_address_t *saddr)
27 {
28 x->sel.daddr.a4 = fl->fl4_dst;
29 x->sel.saddr.a4 = fl->fl4_src;
30 x->sel.dport = xfrm_flowi_dport(fl);
31 x->sel.dport_mask = htons(0xffff);
32 x->sel.sport = xfrm_flowi_sport(fl);
33 x->sel.sport_mask = htons(0xffff);
34 x->sel.family = AF_INET;
35 x->sel.prefixlen_d = 32;
36 x->sel.prefixlen_s = 32;
37 x->sel.proto = fl->proto;
38 x->sel.ifindex = fl->oif;
39 x->id = tmpl->id;
40 if (x->id.daddr.a4 == 0)
41 x->id.daddr.a4 = daddr->a4;
42 x->props.saddr = tmpl->saddr;
43 if (x->props.saddr.a4 == 0)
44 x->props.saddr.a4 = saddr->a4;
45 x->props.mode = tmpl->mode;
46 x->props.reqid = tmpl->reqid;
47 x->props.family = AF_INET;
48 }
49
xfrm4_extract_header(struct sk_buff * skb)50 int xfrm4_extract_header(struct sk_buff *skb)
51 {
52 struct iphdr *iph = ip_hdr(skb);
53
54 XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
55 XFRM_MODE_SKB_CB(skb)->id = iph->id;
56 XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
57 XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
58 XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
59 XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph);
60 memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
61 sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
62
63 return 0;
64 }
65
66 static struct xfrm_state_afinfo xfrm4_state_afinfo = {
67 .family = AF_INET,
68 .proto = IPPROTO_IPIP,
69 .eth_proto = htons(ETH_P_IP),
70 .owner = THIS_MODULE,
71 .init_flags = xfrm4_init_flags,
72 .init_tempsel = __xfrm4_init_tempsel,
73 .output = xfrm4_output,
74 .extract_input = xfrm4_extract_input,
75 .extract_output = xfrm4_extract_output,
76 .transport_finish = xfrm4_transport_finish,
77 };
78
xfrm4_state_init(void)79 void __init xfrm4_state_init(void)
80 {
81 xfrm_state_register_afinfo(&xfrm4_state_afinfo);
82 }
83
84 #if 0
85 void __exit xfrm4_state_fini(void)
86 {
87 xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
88 }
89 #endif /* 0 */
90
91