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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - net/ipv6/xfrm6_output.c
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>
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.
12 #include <linux/if_ether.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/skbuff.h>
16 #include <linux/icmpv6.h>
17 #include <linux/netfilter_ipv6.h>
20 #include <net/ip6_route.h>
23 int xfrm6_find_1stfragopt(struct xfrm_state
*x
, struct sk_buff
*skb
,
26 return ip6_find_1stfragopt(skb
, prevhdr
);
29 EXPORT_SYMBOL(xfrm6_find_1stfragopt
);
31 static int xfrm6_local_dontfrag(struct sk_buff
*skb
)
34 struct sock
*sk
= skb
->sk
;
37 if (sk
->sk_family
!= AF_INET6
)
40 proto
= sk
->sk_protocol
;
41 if (proto
== IPPROTO_UDP
|| proto
== IPPROTO_RAW
)
42 return inet6_sk(sk
)->dontfrag
;
48 static void xfrm6_local_rxpmtu(struct sk_buff
*skb
, u32 mtu
)
51 struct sock
*sk
= skb
->sk
;
53 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
54 fl6
.daddr
= ipv6_hdr(skb
)->daddr
;
56 ipv6_local_rxpmtu(sk
, &fl6
, mtu
);
59 void xfrm6_local_error(struct sk_buff
*skb
, u32 mtu
)
62 const struct ipv6hdr
*hdr
;
63 struct sock
*sk
= skb
->sk
;
65 hdr
= skb
->encapsulation
? inner_ipv6_hdr(skb
) : ipv6_hdr(skb
);
66 fl6
.fl6_dport
= inet_sk(sk
)->inet_dport
;
67 fl6
.daddr
= hdr
->daddr
;
69 ipv6_local_error(sk
, EMSGSIZE
, &fl6
, mtu
);
72 static int xfrm6_tunnel_check_size(struct sk_buff
*skb
)
75 struct dst_entry
*dst
= skb_dst(skb
);
78 if (mtu
< IPV6_MIN_MTU
)
81 if (!skb
->local_df
&& skb
->len
> mtu
) {
84 if (xfrm6_local_dontfrag(skb
))
85 xfrm6_local_rxpmtu(skb
, mtu
);
87 xfrm_local_error(skb
, mtu
);
89 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
96 int xfrm6_extract_output(struct xfrm_state
*x
, struct sk_buff
*skb
)
100 err
= xfrm6_tunnel_check_size(skb
);
104 XFRM_MODE_SKB_CB(skb
)->protocol
= ipv6_hdr(skb
)->nexthdr
;
106 return xfrm6_extract_header(skb
);
109 int xfrm6_prepare_output(struct xfrm_state
*x
, struct sk_buff
*skb
)
113 err
= xfrm_inner_extract_output(x
, skb
);
119 return x
->outer_mode
->output2(x
, skb
);
121 EXPORT_SYMBOL(xfrm6_prepare_output
);
123 int xfrm6_output_finish(struct sk_buff
*skb
)
125 memset(IP6CB(skb
), 0, sizeof(*IP6CB(skb
)));
126 skb
->protocol
= htons(ETH_P_IPV6
);
128 #ifdef CONFIG_NETFILTER
129 IP6CB(skb
)->flags
|= IP6SKB_XFRM_TRANSFORMED
;
132 return xfrm_output(skb
);
135 static int __xfrm6_output(struct sk_buff
*skb
)
137 struct dst_entry
*dst
= skb_dst(skb
);
138 struct xfrm_state
*x
= dst
->xfrm
;
141 #ifdef CONFIG_NETFILTER
143 IP6CB(skb
)->flags
|= IP6SKB_REROUTED
;
144 return dst_output(skb
);
148 if (skb
->protocol
== htons(ETH_P_IPV6
))
149 mtu
= ip6_skb_dst_mtu(skb
);
151 mtu
= dst_mtu(skb_dst(skb
));
153 if (skb
->len
> mtu
&& xfrm6_local_dontfrag(skb
)) {
154 xfrm6_local_rxpmtu(skb
, mtu
);
156 } else if (!skb
->local_df
&& skb
->len
> mtu
&& skb
->sk
) {
157 xfrm_local_error(skb
, mtu
);
161 if (x
->props
.mode
== XFRM_MODE_TUNNEL
&&
162 ((skb
->len
> mtu
&& !skb_is_gso(skb
)) ||
163 dst_allfrag(skb_dst(skb
)))) {
164 return ip6_fragment(skb
, x
->outer_mode
->afinfo
->output_finish
);
166 return x
->outer_mode
->afinfo
->output_finish(skb
);
169 int xfrm6_output(struct sock
*sk
, struct sk_buff
*skb
)
171 return NF_HOOK_COND(NFPROTO_IPV6
, NF_INET_POST_ROUTING
, skb
,
172 NULL
, skb_dst(skb
)->dev
, __xfrm6_output
,
173 !(IP6CB(skb
)->flags
& IP6SKB_REROUTED
));