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Commit | Line | Data |
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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 | } | |
7159039a YH |
28 | EXPORT_SYMBOL(xfrm6_find_1stfragopt); |
29 | ||
dd767856 SK |
30 | static int xfrm6_local_dontfrag(struct sk_buff *skb) |
31 | { | |
32 | int proto; | |
33 | struct sock *sk = skb->sk; | |
34 | ||
35 | if (sk) { | |
628e341f HFS |
36 | if (sk->sk_family != AF_INET6) |
37 | return 0; | |
dd767856 | 38 | |
628e341f | 39 | proto = sk->sk_protocol; |
dd767856 SK |
40 | if (proto == IPPROTO_UDP || proto == IPPROTO_RAW) |
41 | return inet6_sk(sk)->dontfrag; | |
42 | } | |
43 | ||
44 | return 0; | |
45 | } | |
46 | ||
47 | static void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu) | |
48 | { | |
49 | struct flowi6 fl6; | |
50 | struct sock *sk = skb->sk; | |
51 | ||
52 | fl6.flowi6_oif = sk->sk_bound_dev_if; | |
4e3fd7a0 | 53 | fl6.daddr = ipv6_hdr(skb)->daddr; |
dd767856 SK |
54 | |
55 | ipv6_local_rxpmtu(sk, &fl6, mtu); | |
56 | } | |
57 | ||
628e341f | 58 | void xfrm6_local_error(struct sk_buff *skb, u32 mtu) |
dd767856 SK |
59 | { |
60 | struct flowi6 fl6; | |
5d0ff542 | 61 | const struct ipv6hdr *hdr; |
dd767856 SK |
62 | struct sock *sk = skb->sk; |
63 | ||
5d0ff542 | 64 | hdr = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb); |
dd767856 | 65 | fl6.fl6_dport = inet_sk(sk)->inet_dport; |
5d0ff542 | 66 | fl6.daddr = hdr->daddr; |
dd767856 SK |
67 | |
68 | ipv6_local_error(sk, EMSGSIZE, &fl6, mtu); | |
69 | } | |
70 | ||
1da177e4 LT |
71 | static int xfrm6_tunnel_check_size(struct sk_buff *skb) |
72 | { | |
73 | int mtu, ret = 0; | |
adf30907 | 74 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 LT |
75 | |
76 | mtu = dst_mtu(dst); | |
77 | if (mtu < IPV6_MIN_MTU) | |
78 | mtu = IPV6_MIN_MTU; | |
79 | ||
60ff7467 | 80 | if (!skb->ignore_df && skb->len > mtu) { |
180e4250 | 81 | skb->dev = dst->dev; |
dd767856 SK |
82 | |
83 | if (xfrm6_local_dontfrag(skb)) | |
84 | xfrm6_local_rxpmtu(skb, mtu); | |
85 | else if (skb->sk) | |
628e341f | 86 | xfrm_local_error(skb, mtu); |
dd767856 SK |
87 | else |
88 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
1da177e4 LT |
89 | ret = -EMSGSIZE; |
90 | } | |
91 | ||
92 | return ret; | |
93 | } | |
94 | ||
36cf9acf HX |
95 | int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb) |
96 | { | |
97 | int err; | |
98 | ||
99 | err = xfrm6_tunnel_check_size(skb); | |
100 | if (err) | |
101 | return err; | |
102 | ||
60d5fcfb HX |
103 | XFRM_MODE_SKB_CB(skb)->protocol = ipv6_hdr(skb)->nexthdr; |
104 | ||
36cf9acf HX |
105 | return xfrm6_extract_header(skb); |
106 | } | |
107 | ||
108 | int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb) | |
109 | { | |
110 | int err; | |
111 | ||
df9dcb45 | 112 | err = xfrm_inner_extract_output(x, skb); |
36cf9acf HX |
113 | if (err) |
114 | return err; | |
115 | ||
60ff7467 | 116 | skb->ignore_df = 1; |
044a832a | 117 | skb->protocol = htons(ETH_P_IPV6); |
36cf9acf HX |
118 | |
119 | return x->outer_mode->output2(x, skb); | |
120 | } | |
121 | EXPORT_SYMBOL(xfrm6_prepare_output); | |
122 | ||
7026b1dd | 123 | int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb) |
09b8f7a9 | 124 | { |
5596732f | 125 | memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); |
5596732f | 126 | |
862b82c6 HX |
127 | #ifdef CONFIG_NETFILTER |
128 | IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED; | |
129 | #endif | |
09b8f7a9 | 130 | |
7026b1dd | 131 | return xfrm_output(sk, skb); |
09b8f7a9 HX |
132 | } |
133 | ||
0c4b51f0 | 134 | static int __xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
ad0081e4 DS |
135 | { |
136 | struct dst_entry *dst = skb_dst(skb); | |
137 | struct xfrm_state *x = dst->xfrm; | |
5a25cf1e | 138 | int mtu; |
0ea9d5e3 | 139 | |
5596732f SK |
140 | #ifdef CONFIG_NETFILTER |
141 | if (!x) { | |
142 | IP6CB(skb)->flags |= IP6SKB_REROUTED; | |
5a70649e | 143 | return dst_output(sk, skb); |
5596732f SK |
144 | } |
145 | #endif | |
146 | ||
5a25cf1e HFS |
147 | if (skb->protocol == htons(ETH_P_IPV6)) |
148 | mtu = ip6_skb_dst_mtu(skb); | |
149 | else | |
150 | mtu = dst_mtu(skb_dst(skb)); | |
dd767856 SK |
151 | |
152 | if (skb->len > mtu && xfrm6_local_dontfrag(skb)) { | |
153 | xfrm6_local_rxpmtu(skb, mtu); | |
154 | return -EMSGSIZE; | |
60ff7467 | 155 | } else if (!skb->ignore_df && skb->len > mtu && skb->sk) { |
628e341f | 156 | xfrm_local_error(skb, mtu); |
dd767856 SK |
157 | return -EMSGSIZE; |
158 | } | |
ad0081e4 | 159 | |
5b11b2e4 | 160 | if (x->props.mode == XFRM_MODE_TUNNEL && |
dd767856 | 161 | ((skb->len > mtu && !skb_is_gso(skb)) || |
ad0081e4 | 162 | dst_allfrag(skb_dst(skb)))) { |
7026b1dd DM |
163 | return ip6_fragment(sk, skb, |
164 | x->outer_mode->afinfo->output_finish); | |
ad0081e4 | 165 | } |
7026b1dd | 166 | return x->outer_mode->afinfo->output_finish(sk, skb); |
ad0081e4 DS |
167 | } |
168 | ||
aad88724 | 169 | int xfrm6_output(struct sock *sk, struct sk_buff *skb) |
16a6677f | 170 | { |
29a26a56 | 171 | struct net *net = dev_net(skb_dst(skb)->dev); |
be10de0a | 172 | |
29a26a56 EB |
173 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, |
174 | net, sk, skb, NULL, skb_dst(skb)->dev, | |
175 | __xfrm6_output, | |
5596732f | 176 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); |
16a6677f | 177 | } |