/*
 * xfrm4_output.c - Common IPsec encapsulation code for IPv4.
 * 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/netfilter_ipv4.h>
#include <net/dst.h>
#include <net/ip.h>
#include <net/xfrm.h>
#include <net/icmp.h>

static int xfrm4_tunnel_check_size(struct sk_buff *skb)
{
	int mtu, ret = 0;

	if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE)
		goto out;

	if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->ignore_df)
		goto out;

	mtu = dst_mtu(skb_dst(skb));
	if (skb->len > mtu) {
		skb->protocol = htons(ETH_P_IP);

		if (skb->sk)
			xfrm_local_error(skb, mtu);
		else
			icmp_send(skb, ICMP_DEST_UNREACH,
				  ICMP_FRAG_NEEDED, htonl(mtu));
		ret = -EMSGSIZE;
	}
out:
	return ret;
}

int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb)
{
	int err;

	err = xfrm4_tunnel_check_size(skb);
	if (err)
		return err;

	XFRM_MODE_SKB_CB(skb)->protocol = ip_hdr(skb)->protocol;

	return xfrm4_extract_header(skb);
}

int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
{
	int err;

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

	IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE;
	skb->protocol = htons(ETH_P_IP);

	return x->outer_mode->output2(x, skb);
}
EXPORT_SYMBOL(xfrm4_prepare_output);

int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb)
{
	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));

#ifdef CONFIG_NETFILTER
	IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
#endif

	return xfrm_output(sk, skb);
}

static int __xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	struct xfrm_state *x = skb_dst(skb)->xfrm;

#ifdef CONFIG_NETFILTER
	if (!x) {
		IPCB(skb)->flags |= IPSKB_REROUTED;
		return dst_output(net, sk, skb);
	}
#endif

	return x->outer_mode->afinfo->output_finish(sk, skb);
}

int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
			    net, sk, skb, NULL, skb_dst(skb)->dev,
			    __xfrm4_output,
			    !(IPCB(skb)->flags & IPSKB_REROUTED));
}

void xfrm4_local_error(struct sk_buff *skb, u32 mtu)
{
	struct iphdr *hdr;

	hdr = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb);
	ip_local_error(skb->sk, EMSGSIZE, hdr->daddr,
		       inet_sk(skb->sk)->inet_dport, mtu);
}
net-next.git/tree/?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>root</a>/<a href='/cgit.cgi/linux/net-next.git/tree/include?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>include</a>/<a href='/cgit.cgi/linux/net-next.git/tree/include/uapi?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>uapi</a>/<a href='/cgit.cgi/linux/net-next.git/tree/include/uapi/rdma?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>rdma</a></div><div class='content'><table summary='tree listing' class='list'>
<tr class='nohover'><th class='left'>Mode</th><th class='left'>Name</th><th class='right'>Size</th><th/></tr>
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<tr><td class='ls-mode'>-rw-r--r--</td><td><a class='ls-blob h' href='/cgit.cgi/linux/net-next.git/tree/include/uapi/rdma/cxgb3-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>cxgb3-abi.h</a></td><td class='ls-size'>2291</td><td><a class='button' href='/cgit.cgi/linux/net-next.git/log/include/uapi/rdma/cxgb3-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>log</a><a class='button' href='/cgit.cgi/linux/net-next.git/plain/include/uapi/rdma/cxgb3-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>plain</a></td></tr>
<tr><td class='ls-mode'>-rw-r--r--</td><td><a class='ls-blob h' href='/cgit.cgi/linux/net-next.git/tree/include/uapi/rdma/cxgb4-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>cxgb4-abi.h</a></td><td class='ls-size'>2488</td><td><a class='button' href='/cgit.cgi/linux/net-next.git/log/include/uapi/rdma/cxgb4-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>log</a><a class='button' href='/cgit.cgi/linux/net-next.git/plain/include/uapi/rdma/cxgb4-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>plain</a></td></tr>
<tr><td class='ls-mode'>d---------</td><td><a class='ls-dir' href='/cgit.cgi/linux/net-next.git/tree/include/uapi/rdma/hfi?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>hfi</a></td><td class='ls-size'>73</td><td><a class='button' href='/cgit.cgi/linux/net-next.git/log/include/uapi/rdma/hfi?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>log</a><a class='button' href='/cgit.cgi/linux/net-next.git/plain/include/uapi/rdma/hfi?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>plain</a></td></tr>
<tr><td class='ls-mode'>-rw-r--r--</td><td><a class='ls-blob h' href='/cgit.cgi/linux/net-next.git/tree/include/uapi/rdma/hns-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>hns-abi.h</a></td><td class='ls-size'>1795</td><td><a class='button' href='/cgit.cgi/linux/net-next.git/log/include/uapi/rdma/hns-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>log</a><a class='button' href='/cgit.cgi/linux/net-next.git/plain/include/uapi/rdma/hns-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>plain</a></td></tr>
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<tr><td class='ls-mode'>-rw-r--r--</td><td><a class='ls-blob h' href='/cgit.cgi/linux/net-next.git/tree/include/uapi/rdma/ib_user_sa.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>ib_user_sa.h</a></td><td class='ls-size'>2222</td><td><a class='button' href='/cgit.cgi/linux/net-next.git/log/include/uapi/rdma/ib_user_sa.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>log</a><a class='button' href='/cgit.cgi/linux/net-next.git/plain/include/uapi/rdma/ib_user_sa.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>plain</a></td></tr>
<tr><td class='ls-mode'>-rw-r--r--</td><td><a class='ls-blob h' href='/cgit.cgi/linux/net-next.git/tree/include/uapi/rdma/ib_user_verbs.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>ib_user_verbs.h</a></td><td class='ls-size'>21586</td><td><a class='button' href='/cgit.cgi/linux/net-next.git/log/include/uapi/rdma/ib_user_verbs.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>log</a><a class='button' href='/cgit.cgi/linux/net-next.git/plain/include/uapi/rdma/ib_user_verbs.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>plain</a></td></tr>
<tr><td class='ls-mode'>-rw-r--r--</td><td><a class='ls-blob h' href='/cgit.cgi/linux/net-next.git/tree/include/uapi/rdma/mlx4-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>mlx4-abi.h</a></td><td class='ls-size'>2864</td><td><a class='button' href='/cgit.cgi/linux/net-next.git/log/include/uapi/rdma/mlx4-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>log</a><a class='button' href='/cgit.cgi/linux/net-next.git/plain/include/uapi/rdma/mlx4-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>plain</a></td></tr>
<tr><td class='ls-mode'>-rw-r--r--</td><td><a class='ls-blob h' href='/cgit.cgi/linux/net-next.git/tree/include/uapi/rdma/mlx5-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>mlx5-abi.h</a></td><td class='ls-size'>7480</td><td><a class='button' href='/cgit.cgi/linux/net-next.git/log/include/uapi/rdma/mlx5-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>log</a><a class='button' href='/cgit.cgi/linux/net-next.git/plain/include/uapi/rdma/mlx5-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>plain</a></td></tr>
<tr><td class='ls-mode'>-rw-r--r--</td><td><a class='ls-blob h' href='/cgit.cgi/linux/net-next.git/tree/include/uapi/rdma/mthca-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>mthca-abi.h</a></td><td class='ls-size'>2932</td><td><a class='button' href='/cgit.cgi/linux/net-next.git/log/include/uapi/rdma/mthca-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>log</a><a class='button' href='/cgit.cgi/linux/net-next.git/plain/include/uapi/rdma/mthca-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>plain</a></td></tr>
<tr><td class='ls-mode'>-rw-r--r--</td><td><a class='ls-blob h' href='/cgit.cgi/linux/net-next.git/tree/include/uapi/rdma/nes-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>nes-abi.h</a></td><td class='ls-size'>3380</td><td><a class='button' href='/cgit.cgi/linux/net-next.git/log/include/uapi/rdma/nes-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>log</a><a class='button' href='/cgit.cgi/linux/net-next.git/plain/include/uapi/rdma/nes-abi.h?id=3898fac1f488c76e0eef5b5267b4ba8112a82ac4'>plain</a></td></tr>
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