[GitHub/mt8127/android_kernel_alcatel_ttab.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 <herbert@gondor.apana.org.au>
 *
 * 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/ip6_route.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);
		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);
}

static int __xfrm6_output(struct sk_buff *skb)
{
	struct dst_entry *dst = skb_dst(skb);
	struct xfrm_state *x = dst->xfrm;

	if ((x && x->props.mode == XFRM_MODE_TUNNEL) &&
	    ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) ||
		dst_allfrag(skb_dst(skb)))) {
			return ip6_fragment(skb, xfrm6_output_finish);
	}
	return xfrm6_output_finish(skb);
}

int xfrm6_output(struct sk_buff *skb)
{
	return NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb, NULL,
		       skb_dst(skb)->dev, __xfrm6_output);
}
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 <herbert@gondor.apana.org.au>
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	19	#include <net/ipv6.h>
ad0081e4	20	#include <net/ip6_route.h>
1da177e4 LT	21	#include <net/xfrm.h>
1da177e4 LT	22
aee5adb4 MN	23	int xfrm6_find_1stfragopt(struct xfrm_state x, struct sk_buff skb,
	24	u8 **prevhdr)
	25	{
	26	return ip6_find_1stfragopt(skb, prevhdr);
	27	}
	28
7159039a YH	29	EXPORT_SYMBOL(xfrm6_find_1stfragopt);
7159039a YH	30
1da177e4 LT	31	static int xfrm6_tunnel_check_size(struct sk_buff *skb)
	32	{
	33	int mtu, ret = 0;
adf30907	34	struct dst_entry *dst = skb_dst(skb);
1da177e4 LT	35
	36	mtu = dst_mtu(dst);
	37	if (mtu < IPV6_MIN_MTU)
	38	mtu = IPV6_MIN_MTU;
	39
28a89453	40	if (!skb->local_df && skb->len > mtu) {
180e4250	41	skb->dev = dst->dev;
3ffe533c	42	icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1da177e4 LT	43	ret = -EMSGSIZE;
	44	}
	45
	46	return ret;
	47	}
	48
36cf9acf HX	49	int xfrm6_extract_output(struct xfrm_state x, struct sk_buff skb)
	50	{
	51	int err;
	52
	53	err = xfrm6_tunnel_check_size(skb);
	54	if (err)
	55	return err;
	56
60d5fcfb HX	57	XFRM_MODE_SKB_CB(skb)->protocol = ipv6_hdr(skb)->nexthdr;
60d5fcfb HX	58
36cf9acf HX	59	return xfrm6_extract_header(skb);
	60	}
	61
	62	int xfrm6_prepare_output(struct xfrm_state x, struct sk_buff skb)
	63	{
	64	int err;
	65
df9dcb45	66	err = xfrm_inner_extract_output(x, skb);
36cf9acf HX	67	if (err)
	68	return err;
	69
	70	memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
862b82c6 HX	71	#ifdef CONFIG_NETFILTER
	72	IP6CB(skb)->flags \|= IP6SKB_XFRM_TRANSFORMED;
	73	#endif
36cf9acf HX	74
36cf9acf HX	75	skb->protocol = htons(ETH_P_IPV6);
d1d88e5d	76	skb->local_df = 1;
36cf9acf HX	77
	78	return x->outer_mode->output2(x, skb);
	79	}
	80	EXPORT_SYMBOL(xfrm6_prepare_output);
	81
09b8f7a9 HX	82	static int xfrm6_output_finish(struct sk_buff *skb)
09b8f7a9 HX	83	{
862b82c6 HX	84	#ifdef CONFIG_NETFILTER
	85	IP6CB(skb)->flags \|= IP6SKB_XFRM_TRANSFORMED;
	86	#endif
09b8f7a9	87
679e898a	88	skb->protocol = htons(ETH_P_IPV6);
862b82c6	89	return xfrm_output(skb);
09b8f7a9 HX	90	}
09b8f7a9 HX	91
ad0081e4 DS	92	static int __xfrm6_output(struct sk_buff *skb)
	93	{
	94	struct dst_entry *dst = skb_dst(skb);
	95	struct xfrm_state *x = dst->xfrm;
	96
	97	if ((x && x->props.mode == XFRM_MODE_TUNNEL) &&
	98	((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) \|\|
	99	dst_allfrag(skb_dst(skb)))) {
	100	return ip6_fragment(skb, xfrm6_output_finish);
	101	}
	102	return xfrm6_output_finish(skb);
	103	}
	104
16a6677f PM	105	int xfrm6_output(struct sk_buff *skb)
16a6677f PM	106	{
b2e0b385	107	return NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb, NULL,
ad0081e4	108	skb_dst(skb)->dev, __xfrm6_output);
16a6677f	109	}