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