Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[sfrench/cifs-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 #include <linux/export.h>
16
17 static int xfrm4_init_flags(struct xfrm_state *x)
18 {
19         if (xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc)
20                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
21         return 0;
22 }
23
24 static void
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
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
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         .local_error            = xfrm4_local_error,
87 };
88
89 void __init xfrm4_state_init(void)
90 {
91         xfrm_state_register_afinfo(&xfrm4_state_afinfo);
92 }