Root/
1 | /* |
2 | * xfrm4_mode_transport.c - Transport mode encapsulation for IPv4. |
3 | * |
4 | * Copyright (c) 2004-2006 Herbert Xu <herbert@gondor.apana.org.au> |
5 | */ |
6 | |
7 | #include <linux/init.h> |
8 | #include <linux/kernel.h> |
9 | #include <linux/module.h> |
10 | #include <linux/skbuff.h> |
11 | #include <linux/stringify.h> |
12 | #include <net/dst.h> |
13 | #include <net/ip.h> |
14 | #include <net/xfrm.h> |
15 | |
16 | /* Add encapsulation header. |
17 | * |
18 | * The IP header will be moved forward to make space for the encapsulation |
19 | * header. |
20 | */ |
21 | static int xfrm4_transport_output(struct xfrm_state *x, struct sk_buff *skb) |
22 | { |
23 | struct iphdr *iph = ip_hdr(skb); |
24 | int ihl = iph->ihl * 4; |
25 | |
26 | skb_set_network_header(skb, -x->props.header_len); |
27 | skb->mac_header = skb->network_header + |
28 | offsetof(struct iphdr, protocol); |
29 | skb->transport_header = skb->network_header + ihl; |
30 | __skb_pull(skb, ihl); |
31 | memmove(skb_network_header(skb), iph, ihl); |
32 | return 0; |
33 | } |
34 | |
35 | /* Remove encapsulation header. |
36 | * |
37 | * The IP header will be moved over the top of the encapsulation header. |
38 | * |
39 | * On entry, skb->h shall point to where the IP header should be and skb->nh |
40 | * shall be set to where the IP header currently is. skb->data shall point |
41 | * to the start of the payload. |
42 | */ |
43 | static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb) |
44 | { |
45 | int ihl = skb->data - skb_transport_header(skb); |
46 | |
47 | if (skb->transport_header != skb->network_header) { |
48 | memmove(skb_transport_header(skb), |
49 | skb_network_header(skb), ihl); |
50 | skb->network_header = skb->transport_header; |
51 | } |
52 | ip_hdr(skb)->tot_len = htons(skb->len + ihl); |
53 | skb_reset_transport_header(skb); |
54 | return 0; |
55 | } |
56 | |
57 | static struct xfrm_mode xfrm4_transport_mode = { |
58 | .input = xfrm4_transport_input, |
59 | .output = xfrm4_transport_output, |
60 | .owner = THIS_MODULE, |
61 | .encap = XFRM_MODE_TRANSPORT, |
62 | }; |
63 | |
64 | static int __init xfrm4_transport_init(void) |
65 | { |
66 | return xfrm_register_mode(&xfrm4_transport_mode, AF_INET); |
67 | } |
68 | |
69 | static void __exit xfrm4_transport_exit(void) |
70 | { |
71 | int err; |
72 | |
73 | err = xfrm_unregister_mode(&xfrm4_transport_mode, AF_INET); |
74 | BUG_ON(err); |
75 | } |
76 | |
77 | module_init(xfrm4_transport_init); |
78 | module_exit(xfrm4_transport_exit); |
79 | MODULE_LICENSE("GPL"); |
80 | MODULE_ALIAS_XFRM_MODE(AF_INET, XFRM_MODE_TRANSPORT); |
81 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9