tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
5 *
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
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>
18#include <net/dst.h>
19#include <net/ipv6.h>
20#include <net/xfrm.h>
21
22int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
23 u8 **prevhdr)
24{
25 return ip6_find_1stfragopt(skb, prevhdr);
26}
27
28EXPORT_SYMBOL(xfrm6_find_1stfragopt);
29
30static int xfrm6_tunnel_check_size(struct sk_buff *skb)
31{
32 int mtu, ret = 0;
33 struct dst_entry *dst = skb->dst;
34
35 mtu = dst_mtu(dst);
36 if (mtu < IPV6_MIN_MTU)
37 mtu = IPV6_MIN_MTU;
38
39 if (!skb->local_df && skb->len > mtu) {
40 skb->dev = dst->dev;
41 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
42 ret = -EMSGSIZE;
43 }
44
45 return ret;
46}
47
48int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb)
49{
50 int err;
51
52 err = xfrm6_tunnel_check_size(skb);
53 if (err)
54 return err;
55
56 XFRM_MODE_SKB_CB(skb)->protocol = ipv6_hdr(skb)->nexthdr;
57
58 return xfrm6_extract_header(skb);
59}
60
61int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
62{
63 int err;
64
65 err = xfrm_inner_extract_output(x, skb);
66 if (err)
67 return err;
68
69 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
70#ifdef CONFIG_NETFILTER
71 IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
72#endif
73
74 skb->protocol = htons(ETH_P_IPV6);
75
76 return x->outer_mode->output2(x, skb);
77}
78EXPORT_SYMBOL(xfrm6_prepare_output);
79
80static int xfrm6_output_finish(struct sk_buff *skb)
81{
82#ifdef CONFIG_NETFILTER
83 IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
84#endif
85
86 skb->protocol = htons(ETH_P_IPV6);
87 return xfrm_output(skb);
88}
89
90int xfrm6_output(struct sk_buff *skb)
91{
92 return NF_HOOK(PF_INET6, NF_INET_POST_ROUTING, skb, NULL, skb->dst->dev,
93 xfrm6_output_finish);
94}