Commit | Line | Data |
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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* xfrm4_tunnel.c: Generic IP tunnel transformer. |
3 | * | |
4 | * Copyright (C) 2003 David S. Miller (davem@redhat.com) | |
5 | */ | |
6 | ||
afd46503 JP |
7 | #define pr_fmt(fmt) "IPsec: " fmt |
8 | ||
1da177e4 LT |
9 | #include <linux/skbuff.h> |
10 | #include <linux/module.h> | |
11 | #include <net/xfrm.h> | |
1da177e4 LT |
12 | #include <net/protocol.h> |
13 | ||
14 | static int ipip_output(struct xfrm_state *x, struct sk_buff *skb) | |
15 | { | |
7b277b1a | 16 | skb_push(skb, -skb_network_offset(skb)); |
1da177e4 LT |
17 | return 0; |
18 | } | |
19 | ||
e695633e | 20 | static int ipip_xfrm_rcv(struct xfrm_state *x, struct sk_buff *skb) |
1da177e4 | 21 | { |
04663d0b | 22 | return ip_hdr(skb)->protocol; |
1da177e4 LT |
23 | } |
24 | ||
72cb6962 | 25 | static int ipip_init_state(struct xfrm_state *x) |
1da177e4 | 26 | { |
7e49e6de | 27 | if (x->props.mode != XFRM_MODE_TUNNEL) |
1da177e4 LT |
28 | return -EINVAL; |
29 | ||
30 | if (x->encap) | |
31 | return -EINVAL; | |
32 | ||
33 | x->props.header_len = sizeof(struct iphdr); | |
34 | ||
35 | return 0; | |
36 | } | |
37 | ||
38 | static void ipip_destroy(struct xfrm_state *x) | |
39 | { | |
40 | } | |
41 | ||
533cb5b0 | 42 | static const struct xfrm_type ipip_type = { |
1da177e4 LT |
43 | .owner = THIS_MODULE, |
44 | .proto = IPPROTO_IPIP, | |
45 | .init_state = ipip_init_state, | |
46 | .destructor = ipip_destroy, | |
47 | .input = ipip_xfrm_rcv, | |
48 | .output = ipip_output | |
49 | }; | |
50 | ||
c4541b41 HX |
51 | static int xfrm_tunnel_rcv(struct sk_buff *skb) |
52 | { | |
b1641064 | 53 | return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr); |
c4541b41 HX |
54 | } |
55 | ||
d2acc347 HX |
56 | static int xfrm_tunnel_err(struct sk_buff *skb, u32 info) |
57 | { | |
58 | return -ENOENT; | |
59 | } | |
60 | ||
6dcd814b | 61 | static struct xfrm_tunnel xfrm_tunnel_handler __read_mostly = { |
c4541b41 | 62 | .handler = xfrm_tunnel_rcv, |
d2acc347 | 63 | .err_handler = xfrm_tunnel_err, |
7fe94612 | 64 | .priority = 4, |
1da177e4 LT |
65 | }; |
66 | ||
dfd56b8b | 67 | #if IS_ENABLED(CONFIG_IPV6) |
6dcd814b | 68 | static struct xfrm_tunnel xfrm64_tunnel_handler __read_mostly = { |
c4541b41 | 69 | .handler = xfrm_tunnel_rcv, |
c0d56408 | 70 | .err_handler = xfrm_tunnel_err, |
7fe94612 | 71 | .priority = 3, |
c0d56408 KM |
72 | }; |
73 | #endif | |
74 | ||
1da177e4 LT |
75 | static int __init ipip_init(void) |
76 | { | |
77 | if (xfrm_register_type(&ipip_type, AF_INET) < 0) { | |
058bd4d2 | 78 | pr_info("%s: can't add xfrm type\n", __func__); |
1da177e4 LT |
79 | return -EAGAIN; |
80 | } | |
c0d56408 KM |
81 | |
82 | if (xfrm4_tunnel_register(&xfrm_tunnel_handler, AF_INET)) { | |
058bd4d2 | 83 | pr_info("%s: can't add xfrm handler for AF_INET\n", __func__); |
c0d56408 KM |
84 | xfrm_unregister_type(&ipip_type, AF_INET); |
85 | return -EAGAIN; | |
86 | } | |
dfd56b8b | 87 | #if IS_ENABLED(CONFIG_IPV6) |
c0d56408 | 88 | if (xfrm4_tunnel_register(&xfrm64_tunnel_handler, AF_INET6)) { |
058bd4d2 | 89 | pr_info("%s: can't add xfrm handler for AF_INET6\n", __func__); |
c0d56408 | 90 | xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET); |
1da177e4 LT |
91 | xfrm_unregister_type(&ipip_type, AF_INET); |
92 | return -EAGAIN; | |
93 | } | |
c0d56408 | 94 | #endif |
1da177e4 LT |
95 | return 0; |
96 | } | |
97 | ||
98 | static void __exit ipip_fini(void) | |
99 | { | |
dfd56b8b | 100 | #if IS_ENABLED(CONFIG_IPV6) |
c0d56408 | 101 | if (xfrm4_tunnel_deregister(&xfrm64_tunnel_handler, AF_INET6)) |
058bd4d2 JP |
102 | pr_info("%s: can't remove xfrm handler for AF_INET6\n", |
103 | __func__); | |
c0d56408 KM |
104 | #endif |
105 | if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET)) | |
058bd4d2 JP |
106 | pr_info("%s: can't remove xfrm handler for AF_INET\n", |
107 | __func__); | |
4f518e80 | 108 | xfrm_unregister_type(&ipip_type, AF_INET); |
1da177e4 LT |
109 | } |
110 | ||
111 | module_init(ipip_init); | |
112 | module_exit(ipip_fini); | |
113 | MODULE_LICENSE("GPL"); | |
d3d6dd3a | 114 | MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_IPIP); |