Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * xfrm6_output.c - Common IPsec encapsulation code for IPv6. | |
3 | * Copyright (C) 2002 USAGI/WIDE Project | |
4 | * Copyright (c) 2004 Herbert Xu <herbert@gondor.apana.org.au> | |
1ab1457c | 5 | * |
1da177e4 LT |
6 | * This program is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
406ef77c | 12 | #include <linux/if_ether.h> |
36cf9acf HX |
13 | #include <linux/kernel.h> |
14 | #include <linux/module.h> | |
1da177e4 | 15 | #include <linux/skbuff.h> |
1da177e4 | 16 | #include <linux/icmpv6.h> |
16a6677f | 17 | #include <linux/netfilter_ipv6.h> |
36cf9acf | 18 | #include <net/dst.h> |
1da177e4 | 19 | #include <net/ipv6.h> |
ad0081e4 | 20 | #include <net/ip6_route.h> |
1da177e4 LT |
21 | #include <net/xfrm.h> |
22 | ||
aee5adb4 MN |
23 | int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, |
24 | u8 **prevhdr) | |
25 | { | |
26 | return ip6_find_1stfragopt(skb, prevhdr); | |
27 | } | |
28 | ||
7159039a YH |
29 | EXPORT_SYMBOL(xfrm6_find_1stfragopt); |
30 | ||
1da177e4 LT |
31 | static int xfrm6_tunnel_check_size(struct sk_buff *skb) |
32 | { | |
33 | int mtu, ret = 0; | |
adf30907 | 34 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 LT |
35 | |
36 | mtu = dst_mtu(dst); | |
37 | if (mtu < IPV6_MIN_MTU) | |
38 | mtu = IPV6_MIN_MTU; | |
39 | ||
28a89453 | 40 | if (!skb->local_df && skb->len > mtu) { |
180e4250 | 41 | skb->dev = dst->dev; |
3ffe533c | 42 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
1da177e4 LT |
43 | ret = -EMSGSIZE; |
44 | } | |
45 | ||
46 | return ret; | |
47 | } | |
48 | ||
36cf9acf HX |
49 | int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb) |
50 | { | |
51 | int err; | |
52 | ||
53 | err = xfrm6_tunnel_check_size(skb); | |
54 | if (err) | |
55 | return err; | |
56 | ||
60d5fcfb HX |
57 | XFRM_MODE_SKB_CB(skb)->protocol = ipv6_hdr(skb)->nexthdr; |
58 | ||
36cf9acf HX |
59 | return xfrm6_extract_header(skb); |
60 | } | |
61 | ||
62 | int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb) | |
63 | { | |
64 | int err; | |
65 | ||
df9dcb45 | 66 | err = xfrm_inner_extract_output(x, skb); |
36cf9acf HX |
67 | if (err) |
68 | return err; | |
69 | ||
70 | memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); | |
862b82c6 HX |
71 | #ifdef CONFIG_NETFILTER |
72 | IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED; | |
73 | #endif | |
36cf9acf HX |
74 | |
75 | skb->protocol = htons(ETH_P_IPV6); | |
d1d88e5d | 76 | skb->local_df = 1; |
36cf9acf HX |
77 | |
78 | return x->outer_mode->output2(x, skb); | |
79 | } | |
80 | EXPORT_SYMBOL(xfrm6_prepare_output); | |
81 | ||
09b8f7a9 HX |
82 | static int xfrm6_output_finish(struct sk_buff *skb) |
83 | { | |
862b82c6 HX |
84 | #ifdef CONFIG_NETFILTER |
85 | IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED; | |
86 | #endif | |
09b8f7a9 | 87 | |
679e898a | 88 | skb->protocol = htons(ETH_P_IPV6); |
862b82c6 | 89 | return xfrm_output(skb); |
09b8f7a9 HX |
90 | } |
91 | ||
ad0081e4 DS |
92 | static int __xfrm6_output(struct sk_buff *skb) |
93 | { | |
94 | struct dst_entry *dst = skb_dst(skb); | |
95 | struct xfrm_state *x = dst->xfrm; | |
96 | ||
97 | if ((x && x->props.mode == XFRM_MODE_TUNNEL) && | |
98 | ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) || | |
99 | dst_allfrag(skb_dst(skb)))) { | |
100 | return ip6_fragment(skb, xfrm6_output_finish); | |
101 | } | |
102 | return xfrm6_output_finish(skb); | |
103 | } | |
104 | ||
16a6677f PM |
105 | int xfrm6_output(struct sk_buff *skb) |
106 | { | |
b2e0b385 | 107 | return NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb, NULL, |
ad0081e4 | 108 | skb_dst(skb)->dev, __xfrm6_output); |
16a6677f | 109 | } |