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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 (ipv4_config.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 | }; |
87 | |
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 |
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