ipv4: fix multicast losses
[linux-2.6.git] / net / ipv4 / xfrm4_state.c
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
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
24 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
25 {
26         const struct flowi4 *fl4 = &fl->u.ip4;
27
28         sel->daddr.a4 = fl4->daddr;
29         sel->saddr.a4 = fl4->saddr;
30         sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
31         sel->dport_mask = htons(0xffff);
32         sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
33         sel->sport_mask = htons(0xffff);
34         sel->family = AF_INET;
35         sel->prefixlen_d = 32;
36         sel->prefixlen_s = 32;
37         sel->proto = fl4->flowi4_proto;
38         sel->ifindex = fl4->flowi4_oif;
39 }
40
41 static void
42 xfrm4_init_temprop(struct xfrm_state *x, const struct xfrm_tmpl *tmpl,
43                    const xfrm_address_t *daddr, const xfrm_address_t *saddr)
44 {
45         x->id = tmpl->id;
46         if (x->id.daddr.a4 == 0)
47                 x->id.daddr.a4 = daddr->a4;
48         x->props.saddr = tmpl->saddr;
49         if (x->props.saddr.a4 == 0)
50                 x->props.saddr.a4 = saddr->a4;
51         x->props.mode = tmpl->mode;
52         x->props.reqid = tmpl->reqid;
53         x->props.family = AF_INET;
54 }
55
56 int xfrm4_extract_header(struct sk_buff *skb)
57 {
58         const struct iphdr *iph = ip_hdr(skb);
59
60         XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
61         XFRM_MODE_SKB_CB(skb)->id = iph->id;
62         XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
63         XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
64         XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
65         XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph);
66         memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
67                sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
68
69         return 0;
70 }
71
72 static struct xfrm_state_afinfo xfrm4_state_afinfo = {
73         .family                 = AF_INET,
74         .proto                  = IPPROTO_IPIP,
75         .eth_proto              = htons(ETH_P_IP),
76         .owner                  = THIS_MODULE,
77         .init_flags             = xfrm4_init_flags,
78         .init_tempsel           = __xfrm4_init_tempsel,
79         .init_temprop           = xfrm4_init_temprop,
80         .output                 = xfrm4_output,
81         .output_finish          = xfrm4_output_finish,
82         .extract_input          = xfrm4_extract_input,
83         .extract_output         = xfrm4_extract_output,
84         .transport_finish       = xfrm4_transport_finish,
85 };
86
87 void __init xfrm4_state_init(void)
88 {
89         xfrm_state_register_afinfo(&xfrm4_state_afinfo);
90 }
91
92 #if 0
93 void __exit xfrm4_state_fini(void)
94 {
95         xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
96 }
97 #endif  /*  0  */
98