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git.proxmox.com Git - mirror_ubuntu-hirsute-kernel.git/blob - net/ipv6/xfrm6_output.c
5959ce9620eb92ece2830d6a59ed21d562a3a1cf
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
);
28 EXPORT_SYMBOL(xfrm6_find_1stfragopt
);
30 static int xfrm6_local_dontfrag(struct sk_buff
*skb
)
33 struct sock
*sk
= skb
->sk
;
36 if (sk
->sk_family
!= AF_INET6
)
39 proto
= sk
->sk_protocol
;
40 if (proto
== IPPROTO_UDP
|| proto
== IPPROTO_RAW
)
41 return inet6_sk(sk
)->dontfrag
;
47 static void xfrm6_local_rxpmtu(struct sk_buff
*skb
, u32 mtu
)
50 struct sock
*sk
= skb
->sk
;
52 fl6
.flowi6_oif
= sk
->sk_bound_dev_if
;
53 fl6
.daddr
= ipv6_hdr(skb
)->daddr
;
55 ipv6_local_rxpmtu(sk
, &fl6
, mtu
);
58 void xfrm6_local_error(struct sk_buff
*skb
, u32 mtu
)
61 const struct ipv6hdr
*hdr
;
62 struct sock
*sk
= skb
->sk
;
64 hdr
= skb
->encapsulation
? inner_ipv6_hdr(skb
) : ipv6_hdr(skb
);
65 fl6
.fl6_dport
= inet_sk(sk
)->inet_dport
;
66 fl6
.daddr
= hdr
->daddr
;
68 ipv6_local_error(sk
, EMSGSIZE
, &fl6
, mtu
);
71 static int xfrm6_tunnel_check_size(struct sk_buff
*skb
)
74 struct dst_entry
*dst
= skb_dst(skb
);
80 if (mtu
< IPV6_MIN_MTU
)
83 if ((!skb_is_gso(skb
) && skb
->len
> mtu
) ||
85 !skb_gso_validate_network_len(skb
, ip6_skb_dst_mtu(skb
)))) {
87 skb
->protocol
= htons(ETH_P_IPV6
);
89 if (xfrm6_local_dontfrag(skb
))
90 xfrm6_local_rxpmtu(skb
, mtu
);
92 xfrm_local_error(skb
, mtu
);
94 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
101 int xfrm6_extract_output(struct xfrm_state
*x
, struct sk_buff
*skb
)
105 err
= xfrm6_tunnel_check_size(skb
);
109 XFRM_MODE_SKB_CB(skb
)->protocol
= ipv6_hdr(skb
)->nexthdr
;
111 return xfrm6_extract_header(skb
);
114 int xfrm6_prepare_output(struct xfrm_state
*x
, struct sk_buff
*skb
)
118 err
= xfrm_inner_extract_output(x
, skb
);
123 skb
->protocol
= htons(ETH_P_IPV6
);
125 return x
->outer_mode
->output2(x
, skb
);
127 EXPORT_SYMBOL(xfrm6_prepare_output
);
129 int xfrm6_output_finish(struct sock
*sk
, struct sk_buff
*skb
)
131 memset(IP6CB(skb
), 0, sizeof(*IP6CB(skb
)));
133 #ifdef CONFIG_NETFILTER
134 IP6CB(skb
)->flags
|= IP6SKB_XFRM_TRANSFORMED
;
137 return xfrm_output(sk
, skb
);
140 static int __xfrm6_output_finish(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
)
142 struct xfrm_state
*x
= skb_dst(skb
)->xfrm
;
144 return x
->outer_mode
->afinfo
->output_finish(sk
, skb
);
147 static int __xfrm6_output(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
)
149 struct dst_entry
*dst
= skb_dst(skb
);
150 struct xfrm_state
*x
= dst
->xfrm
;
154 #ifdef CONFIG_NETFILTER
156 IP6CB(skb
)->flags
|= IP6SKB_REROUTED
;
157 return dst_output(net
, sk
, skb
);
161 if (x
->props
.mode
!= XFRM_MODE_TUNNEL
)
164 if (skb
->protocol
== htons(ETH_P_IPV6
))
165 mtu
= ip6_skb_dst_mtu(skb
);
167 mtu
= dst_mtu(skb_dst(skb
));
169 toobig
= skb
->len
> mtu
&& !skb_is_gso(skb
);
171 if (toobig
&& xfrm6_local_dontfrag(skb
)) {
172 xfrm6_local_rxpmtu(skb
, mtu
);
174 } else if (!skb
->ignore_df
&& toobig
&& skb
->sk
) {
175 xfrm_local_error(skb
, mtu
);
179 if (toobig
|| dst_allfrag(skb_dst(skb
)))
180 return ip6_fragment(net
, sk
, skb
,
181 __xfrm6_output_finish
);
184 return x
->outer_mode
->afinfo
->output_finish(sk
, skb
);
187 int xfrm6_output(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
)
189 return NF_HOOK_COND(NFPROTO_IPV6
, NF_INET_POST_ROUTING
,
190 net
, sk
, skb
, NULL
, skb_dst(skb
)->dev
,
192 !(IP6CB(skb
)->flags
& IP6SKB_REROUTED
));