2005-04-16 15:20:36 -07:00
										 
									 
								 
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								/*
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								 * xfrm4_output.c - Common IPsec encapsulation code for IPv4.
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								 * Copyright (c) 2004 Herbert Xu <herbert@gondor.apana.org.au>
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								 *
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											2005-04-16 15:20:36 -07:00
										 
									 
								 
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								 * This program is free software; you can redistribute it and/or
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								 * modify it under the terms of the GNU General Public License
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								 * as published by the Free Software Foundation; either version
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								 * 2 of the License, or (at your option) any later version.
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								 */
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											2006-06-22 03:08:03 -07:00
										 
									 
								 
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								#include <linux/if_ether.h>
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								#include <linux/kernel.h>
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											2007-11-13 21:40:52 -08:00
										 
									 
								 
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								#include <linux/module.h>
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								#include <linux/skbuff.h>
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											2006-01-06 23:01:48 -08:00
										 
									 
								 
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								#include <linux/netfilter_ipv4.h>
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								#include <net/dst.h>
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								#include <net/ip.h>
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								#include <net/xfrm.h>
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								#include <net/icmp.h>
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								static int xfrm4_tunnel_check_size(struct sk_buff *skb)
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								{
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									int mtu, ret = 0;
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									struct dst_entry *dst;
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									if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE)
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										goto out;
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											2007-04-20 22:47:35 -07:00
										 
									 
								 
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									if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->local_df)
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										goto out;
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											2009-06-02 05:19:30 +00:00
										 
									 
								 
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									dst = skb_dst(skb);
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									mtu = dst_mtu(dst);
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									if (skb->len > mtu) {
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											2011-06-29 23:20:41 +00:00
										 
									 
								 
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										if (skb->sk)
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											ip_local_error(skb->sk, EMSGSIZE, ip_hdr(skb)->daddr,
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												       inet_sk(skb->sk)->inet_dport, mtu);
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										else
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											icmp_send(skb, ICMP_DEST_UNREACH,
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												  ICMP_FRAG_NEEDED, htonl(mtu));
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										ret = -EMSGSIZE;
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									}
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								out:
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									return ret;
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								}
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											2007-11-13 21:40:52 -08:00
										 
									 
								 
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								int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb)
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								{
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									int err;
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									err = xfrm4_tunnel_check_size(skb);
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									if (err)
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										return err;
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											2007-11-19 18:47:58 -08:00
										 
									 
								 
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									XFRM_MODE_SKB_CB(skb)->protocol = ip_hdr(skb)->protocol;
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											2007-11-13 21:40:52 -08:00
										 
									 
								 
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									return xfrm4_extract_header(skb);
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								}
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								int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
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								{
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									int err;
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											2008-03-24 14:51:51 -07:00
										 
									 
								 
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									err = xfrm_inner_extract_output(x, skb);
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									if (err)
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										return err;
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									memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
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											2007-11-13 21:43:11 -08:00
										 
									 
								 
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									IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED;
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									skb->protocol = htons(ETH_P_IP);
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									return x->outer_mode->output2(x, skb);
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								}
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								EXPORT_SYMBOL(xfrm4_prepare_output);
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											2011-05-09 19:36:38 +00:00
										 
									 
								 
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								int xfrm4_output_finish(struct sk_buff *skb)
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								{
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								#ifdef CONFIG_NETFILTER
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									if (!skb_dst(skb)->xfrm) {
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										IPCB(skb)->flags |= IPSKB_REROUTED;
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										return dst_output(skb);
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									}
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											2007-11-13 21:43:11 -08:00
										 
									 
								 
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									IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
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								#endif
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									skb->protocol = htons(ETH_P_IP);
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											2007-11-13 21:43:11 -08:00
										 
									 
								 
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									return xfrm_output(skb);
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								}
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											2006-01-06 23:01:48 -08:00
										 
									 
								 
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								int xfrm4_output(struct sk_buff *skb)
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								{
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											2011-05-09 19:36:38 +00:00
										 
									 
								 
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									struct dst_entry *dst = skb_dst(skb);
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									struct xfrm_state *x = dst->xfrm;
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											2010-03-23 04:07:29 +01:00
										 
									 
								 
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									return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, skb,
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											2011-05-09 19:36:38 +00:00
										 
									 
								 
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											    NULL, dst->dev,
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											    x->outer_mode->afinfo->output_finish,
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											2006-02-15 15:10:22 -08:00
										 
									 
								 
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											    !(IPCB(skb)->flags & IPSKB_REROUTED));
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											2006-01-06 23:01:48 -08:00
										 
									 
								 
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								}
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