1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * xfrm4_state.c |
4 | * |
5 | * Changes: |
6 | * YOSHIFUJI Hideaki @USAGI |
7 | * Split up af-specific portion |
8 | * |
9 | */ |
10 | |
11 | #include <net/ip.h> |
12 | #include <net/xfrm.h> |
13 | #include <linux/pfkeyv2.h> |
14 | #include <linux/ipsec.h> |
15 | #include <linux/netfilter_ipv4.h> |
16 | #include <linux/export.h> |
17 | |
18 | static int xfrm4_init_flags(struct xfrm_state *x) |
19 | { |
20 | if (xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc) |
21 | x->props.flags |= XFRM_STATE_NOPMTUDISC; |
22 | return 0; |
23 | } |
24 | |
25 | static void |
26 | __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl) |
27 | { |
28 | const struct flowi4 *fl4 = &fl->u.ip4; |
29 | |
30 | sel->daddr.a4 = fl4->daddr; |
31 | sel->saddr.a4 = fl4->saddr; |
32 | sel->dport = xfrm_flowi_dport(fl, &fl4->uli); |
33 | sel->dport_mask = htons(0xffff); |
34 | sel->sport = xfrm_flowi_sport(fl, &fl4->uli); |
35 | sel->sport_mask = htons(0xffff); |
36 | sel->family = AF_INET; |
37 | sel->prefixlen_d = 32; |
38 | sel->prefixlen_s = 32; |
39 | sel->proto = fl4->flowi4_proto; |
40 | sel->ifindex = fl4->flowi4_oif; |
41 | } |
42 | |
43 | static void |
44 | xfrm4_init_temprop(struct xfrm_state *x, const struct xfrm_tmpl *tmpl, |
45 | const xfrm_address_t *daddr, const xfrm_address_t *saddr) |
46 | { |
47 | x->id = tmpl->id; |
48 | if (x->id.daddr.a4 == 0) |
49 | x->id.daddr.a4 = daddr->a4; |
50 | x->props.saddr = tmpl->saddr; |
51 | if (x->props.saddr.a4 == 0) |
52 | x->props.saddr.a4 = saddr->a4; |
53 | x->props.mode = tmpl->mode; |
54 | x->props.reqid = tmpl->reqid; |
55 | x->props.family = AF_INET; |
56 | } |
57 | |
58 | int (struct sk_buff *skb) |
59 | { |
60 | const struct iphdr *iph = ip_hdr(skb); |
61 | |
62 | XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph); |
63 | XFRM_MODE_SKB_CB(skb)->id = iph->id; |
64 | XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off; |
65 | XFRM_MODE_SKB_CB(skb)->tos = iph->tos; |
66 | XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl; |
67 | XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph); |
68 | memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0, |
69 | sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl)); |
70 | |
71 | return 0; |
72 | } |
73 | |
74 | static struct xfrm_state_afinfo xfrm4_state_afinfo = { |
75 | .family = AF_INET, |
76 | .proto = IPPROTO_IPIP, |
77 | .eth_proto = htons(ETH_P_IP), |
78 | .owner = THIS_MODULE, |
79 | .init_flags = xfrm4_init_flags, |
80 | .init_tempsel = __xfrm4_init_tempsel, |
81 | .init_temprop = xfrm4_init_temprop, |
82 | .output = xfrm4_output, |
83 | .output_finish = xfrm4_output_finish, |
84 | .extract_input = xfrm4_extract_input, |
85 | .extract_output = xfrm4_extract_output, |
86 | .transport_finish = xfrm4_transport_finish, |
87 | .local_error = xfrm4_local_error, |
88 | }; |
89 | |
90 | void __init xfrm4_state_init(void) |
91 | { |
92 | xfrm_state_register_afinfo(&xfrm4_state_afinfo); |
93 | } |
94 | |