[linux.git] / net / ipv6 / xfrm6_output.c

/*
 * xfrm6_output.c - Common IPsec encapsulation code for IPv6.
 * Copyright (C) 2002 USAGI/WIDE Project
 * Copyright (c) 2004 Herbert Xu <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/if_ether.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/icmpv6.h>
#include <linux/netfilter_ipv6.h>
#include <net/dst.h>
#include <net/ipv6.h>
#include <net/xfrm.h>

int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
			  u8 **prevhdr)
{
	return ip6_find_1stfragopt(skb, prevhdr);
}

EXPORT_SYMBOL(xfrm6_find_1stfragopt);

static int xfrm6_tunnel_check_size(struct sk_buff *skb)
{
	int mtu, ret = 0;
	struct dst_entry *dst = skb_dst(skb);

	mtu = dst_mtu(dst);
	if (mtu < IPV6_MIN_MTU)
		mtu = IPV6_MIN_MTU;

	if (!skb->local_df && skb->len > mtu) {
		skb->dev = dst->dev;
		icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
		ret = -EMSGSIZE;
	}

	return ret;
}

int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb)
{
	int err;

	err = xfrm6_tunnel_check_size(skb);
	if (err)
		return err;

	XFRM_MODE_SKB_CB(skb)->protocol = ipv6_hdr(skb)->nexthdr;

	return xfrm6_extract_header(skb);
}

int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
{
	int err;

	err = xfrm_inner_extract_output(x, skb);
	if (err)
		return err;

	memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
#ifdef CONFIG_NETFILTER
	IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
#endif

	skb->protocol = htons(ETH_P_IPV6);
	skb->local_df = 1;

	return x->outer_mode->output2(x, skb);
}
EXPORT_SYMBOL(xfrm6_prepare_output);

static int xfrm6_output_finish(struct sk_buff *skb)
{
#ifdef CONFIG_NETFILTER
	IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
#endif

	skb->protocol = htons(ETH_P_IPV6);
	return xfrm_output(skb);
}

int xfrm6_output(struct sk_buff *skb)
{
	return NF_HOOK(PF_INET6, NF_INET_POST_ROUTING, skb, NULL, skb_dst(skb)->dev,
		       xfrm6_output_finish);
}
Commit	Line	Data
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 <[email protected]>
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>
36cf9acf HX	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 LT	19	#include <net/ipv6.h>
	20	#include <net/xfrm.h>
	21
aee5adb4 MN	22	int xfrm6_find_1stfragopt(struct xfrm_state x, struct sk_buff skb,
	23	u8 **prevhdr)
	24	{
	25	return ip6_find_1stfragopt(skb, prevhdr);
	26	}
	27
7159039a YH	28	EXPORT_SYMBOL(xfrm6_find_1stfragopt);
7159039a YH	29
1da177e4 LT	30	static int xfrm6_tunnel_check_size(struct sk_buff *skb)
	31	{
	32	int mtu, ret = 0;
adf30907	33	struct dst_entry *dst = skb_dst(skb);
1da177e4 LT	34
	35	mtu = dst_mtu(dst);
	36	if (mtu < IPV6_MIN_MTU)
	37	mtu = IPV6_MIN_MTU;
	38
28a89453	39	if (!skb->local_df && skb->len > mtu) {
180e4250	40	skb->dev = dst->dev;
1da177e4 LT	41	icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
	42	ret = -EMSGSIZE;
	43	}
	44
	45	return ret;
	46	}
	47
36cf9acf HX	48	int 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
60d5fcfb HX	56	XFRM_MODE_SKB_CB(skb)->protocol = ipv6_hdr(skb)->nexthdr;
60d5fcfb HX	57
36cf9acf HX	58	return xfrm6_extract_header(skb);
	59	}
	60
	61	int xfrm6_prepare_output(struct xfrm_state x, struct sk_buff skb)
	62	{
	63	int err;
	64
df9dcb45	65	err = xfrm_inner_extract_output(x, skb);
36cf9acf HX	66	if (err)
	67	return err;
	68
	69	memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
862b82c6 HX	70	#ifdef CONFIG_NETFILTER
	71	IP6CB(skb)->flags \|= IP6SKB_XFRM_TRANSFORMED;
	72	#endif
36cf9acf HX	73
36cf9acf HX	74	skb->protocol = htons(ETH_P_IPV6);
d1d88e5d	75	skb->local_df = 1;
36cf9acf HX	76
	77	return x->outer_mode->output2(x, skb);
	78	}
	79	EXPORT_SYMBOL(xfrm6_prepare_output);
	80
09b8f7a9 HX	81	static int xfrm6_output_finish(struct sk_buff *skb)
09b8f7a9 HX	82	{
862b82c6 HX	83	#ifdef CONFIG_NETFILTER
	84	IP6CB(skb)->flags \|= IP6SKB_XFRM_TRANSFORMED;
	85	#endif
09b8f7a9	86
679e898a	87	skb->protocol = htons(ETH_P_IPV6);
862b82c6	88	return xfrm_output(skb);
09b8f7a9 HX	89	}
09b8f7a9 HX	90
16a6677f PM	91	int xfrm6_output(struct sk_buff *skb)
16a6677f PM	92	{
adf30907	93	return NF_HOOK(PF_INET6, NF_INET_POST_ROUTING, skb, NULL, skb_dst(skb)->dev,
16a6677f PM	94	xfrm6_output_finish);
16a6677f PM	95	}