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1 | /* |
2 | * xfrm6_mode_transport.c - Transport mode encapsulation for IPv6. |
3 | * |
4 | * Copyright (C) 2002 USAGI/WIDE Project |
5 | * Copyright (c) 2004-2006 Herbert Xu <herbert@gondor.apana.org.au> |
6 | */ |
7 | |
8 | #include <linux/init.h> |
9 | #include <linux/kernel.h> |
10 | #include <linux/module.h> |
11 | #include <linux/skbuff.h> |
12 | #include <linux/stringify.h> |
13 | #include <net/dst.h> |
14 | #include <net/ipv6.h> |
15 | #include <net/xfrm.h> |
16 | |
17 | /* Add encapsulation header. |
18 | * |
19 | * The IP header and mutable extension headers will be moved forward to make |
20 | * space for the encapsulation header. |
21 | */ |
22 | static int xfrm6_transport_output(struct xfrm_state *x, struct sk_buff *skb) |
23 | { |
24 | struct ipv6hdr *iph; |
25 | u8 *prevhdr; |
26 | int hdr_len; |
27 | |
28 | iph = ipv6_hdr(skb); |
29 | |
30 | hdr_len = x->type->hdr_offset(x, skb, &prevhdr); |
31 | skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data); |
32 | skb_set_network_header(skb, -x->props.header_len); |
33 | skb->transport_header = skb->network_header + hdr_len; |
34 | __skb_pull(skb, hdr_len); |
35 | memmove(ipv6_hdr(skb), iph, hdr_len); |
36 | return 0; |
37 | } |
38 | |
39 | /* Remove encapsulation header. |
40 | * |
41 | * The IP header will be moved over the top of the encapsulation header. |
42 | * |
43 | * On entry, skb->h shall point to where the IP header should be and skb->nh |
44 | * shall be set to where the IP header currently is. skb->data shall point |
45 | * to the start of the payload. |
46 | */ |
47 | static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb) |
48 | { |
49 | int ihl = skb->data - skb_transport_header(skb); |
50 | |
51 | if (skb->transport_header != skb->network_header) { |
52 | memmove(skb_transport_header(skb), |
53 | skb_network_header(skb), ihl); |
54 | skb->network_header = skb->transport_header; |
55 | } |
56 | ipv6_hdr(skb)->payload_len = htons(skb->len + ihl - |
57 | sizeof(struct ipv6hdr)); |
58 | skb_reset_transport_header(skb); |
59 | return 0; |
60 | } |
61 | |
62 | static struct xfrm_mode xfrm6_transport_mode = { |
63 | .input = xfrm6_transport_input, |
64 | .output = xfrm6_transport_output, |
65 | .owner = THIS_MODULE, |
66 | .encap = XFRM_MODE_TRANSPORT, |
67 | }; |
68 | |
69 | static int __init xfrm6_transport_init(void) |
70 | { |
71 | return xfrm_register_mode(&xfrm6_transport_mode, AF_INET6); |
72 | } |
73 | |
74 | static void __exit xfrm6_transport_exit(void) |
75 | { |
76 | int err; |
77 | |
78 | err = xfrm_unregister_mode(&xfrm6_transport_mode, AF_INET6); |
79 | BUG_ON(err); |
80 | } |
81 | |
82 | module_init(xfrm6_transport_init); |
83 | module_exit(xfrm6_transport_exit); |
84 | MODULE_LICENSE("GPL"); |
85 | MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_TRANSPORT); |
86 |
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