/*
 * 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_local_dontfrag(struct sk_buff *skb)
{
	int proto;
	struct sock *sk = skb->sk;

	if (sk) {
		if (sk->sk_family != AF_INET6)
			return 0;

		proto = sk->sk_protocol;
		if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
			return inet6_sk(sk)->dontfrag;
	}

	return 0;
}

static void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu)
{
	struct flowi6 fl6;
	struct sock *sk = skb->sk;

	fl6.flowi6_oif = sk->sk_bound_dev_if;
	fl6.daddr = ipv6_hdr(skb)->daddr;

	ipv6_local_rxpmtu(sk, &fl6, mtu);
}

void xfrm6_local_error(struct sk_buff *skb, u32 mtu)
{
	struct flowi6 fl6;
	const struct ipv6hdr *hdr;
	struct sock *sk = skb->sk;

	hdr = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb);
	fl6.fl6_dport = inet_sk(sk)->inet_dport;
	fl6.daddr = hdr->daddr;

	ipv6_local_error(sk, EMSGSIZE, &fl6, mtu);
}

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->ignore_df && skb->len > mtu) {
		skb->dev = dst->dev;
		skb->protocol = htons(ETH_P_IPV6);

		if (xfrm6_local_dontfrag(skb))
			xfrm6_local_rxpmtu(skb, mtu);
		else if (skb->sk)
			xfrm_local_error(skb, mtu);
		else
			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;

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

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

int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb)
{
	memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));

#ifdef CONFIG_NETFILTER
	IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
#endif

	return xfrm_output(sk, skb);
}

static int __xfrm6_output_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	struct xfrm_state *x = skb_dst(skb)->xfrm;

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

static int __xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	struct dst_entry *dst = skb_dst(skb);
	struct xfrm_state *x = dst->xfrm;
	int mtu;
	bool toobig;

#ifdef CONFIG_NETFILTER
	if (!x) {
		IP6CB(skb)->flags |= IP6SKB_REROUTED;
		return dst_output(net, sk, skb);
	}
#endif

	if (x->props.mode != XFRM_MODE_TUNNEL)
		goto skip_frag;

	if (skb->protocol == htons(ETH_P_IPV6))
		mtu = ip6_skb_dst_mtu(skb);
	else
		mtu = dst_mtu(skb_dst(skb));

	toobig = skb->len > mtu && !skb_is_gso(skb);

	if (toobig && xfrm6_local_dontfrag(skb)) {
		xfrm6_local_rxpmtu(skb, mtu);
		return -EMSGSIZE;
	} else if (!skb->ignore_df && toobig && skb->sk) {
		xfrm_local_error(skb, mtu);
		return -EMSGSIZE;
	}

	if (toobig || dst_allfrag(skb_dst(skb)))
		return ip6_fragment(net, sk, skb,
				    __xfrm6_output_finish);

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

int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
			    net, sk, skb,  NULL, skb_dst(skb)->dev,
			    __xfrm6_output,
			    !(IP6CB(skb)->flags & IP6SKB_REROUTED));
}
/select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Marcel J.E. Mol &lt;marcel@mesa.nl&gt;</td><td class='right'>2017-01-30 19:26:40 +0100</td></tr>
<tr><th>committer</th><td>Johan Hovold &lt;johan@kernel.org&gt;</td><td class='right'>2017-01-31 17:27:04 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/trace/events/vmscan.h?id=d07830db1bdb254e4b50d366010b219286b8c937'>d07830db1bdb254e4b50d366010b219286b8c937</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/trace/events/vmscan.h?id=d07830db1bdb254e4b50d366010b219286b8c937'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=d07830db1bdb254e4b50d366010b219286b8c937'>354d7fca237fa3d7e7e63c2196eaa4e1086838ea</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/trace/events/vmscan.h?id=d07830db1bdb254e4b50d366010b219286b8c937'>include/trace/events/vmscan.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/trace/events/vmscan.h?id=5d03a2fd2292e71936c4235885c35ccc3c94695b'>5d03a2fd2292e71936c4235885c35ccc3c94695b</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/trace/events/vmscan.h?id=d07830db1bdb254e4b50d366010b219286b8c937&amp;id2=5d03a2fd2292e71936c4235885c35ccc3c94695b'>diff</a>)</td></tr></table>
<div class='commit-subject'>USB: serial: pl2303: add ATEN device ID</div><div class='commit-msg'>Seems that ATEN serial-to-usb devices using pl2303 exist with
different device ids. This patch adds a missing device ID so it
is recognised by the driver.

Signed-off-by: Marcel J.E. Mol &lt;marcel@mesa.nl&gt;
Cc: stable &lt;stable@vger.kernel.org&gt;
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=d07830db1bdb254e4b50d366010b219286b8c937'>Diffstat</a> (limited to 'include/trace/events/vmscan.h')</div><table summary='diffstat' class='diffstat'>