/*
 * net/sched/act_meta_tc_index.c IFE skb->tc_index metadata module
 *
 *		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.
 *
 * copyright Jamal Hadi Salim (2016)
 *
*/

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/module.h>
#include <linux/init.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <uapi/linux/tc_act/tc_ife.h>
#include <net/tc_act/tc_ife.h>
#include <linux/rtnetlink.h>

static int skbtcindex_encode(struct sk_buff *skb, void *skbdata,
			     struct tcf_meta_info *e)
{
	u32 ifetc_index = skb->tc_index;

	return ife_encode_meta_u16(ifetc_index, skbdata, e);
}

static int skbtcindex_decode(struct sk_buff *skb, void *data, u16 len)
{
	u16 ifetc_index = *(u16 *)data;

	skb->tc_index = ntohs(ifetc_index);
	return 0;
}

static int skbtcindex_check(struct sk_buff *skb, struct tcf_meta_info *e)
{
	return ife_check_meta_u16(skb->tc_index, e);
}

static struct tcf_meta_ops ife_skbtcindex_ops = {
	.metaid = IFE_META_TCINDEX,
	.metatype = NLA_U16,
	.name = "tc_index",
	.synopsis = "skb tc_index 16 bit metadata",
	.check_presence = skbtcindex_check,
	.encode = skbtcindex_encode,
	.decode = skbtcindex_decode,
	.get = ife_get_meta_u16,
	.alloc = ife_alloc_meta_u16,
	.release = ife_release_meta_gen,
	.validate = ife_validate_meta_u16,
	.owner = THIS_MODULE,
};

static int __init ifetc_index_init_module(void)
{
	return register_ife_op(&ife_skbtcindex_ops);
}

static void __exit ifetc_index_cleanup_module(void)
{
	unregister_ife_op(&ife_skbtcindex_ops);
}

module_init(ifetc_index_init_module);
module_exit(ifetc_index_cleanup_module);

MODULE_AUTHOR("Jamal Hadi Salim(2016)");
MODULE_DESCRIPTION("Inter-FE skb tc_index metadata module");
MODULE_LICENSE("GPL");
MODULE_ALIAS_IFE_META(IFE_META_SKBTCINDEX);
/linux/net-next.git/log/'>
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</td></tr></table>
<div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/?id=5a70348e1187c5bf1cbd0ec51843f36befed1c2d'>Collapse</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
<tr class='logheader'><td><span title='2017-02-09 16:41:43 -0500'>2017-02-09</span></td><td class='logsubject'><a href='/cgit.cgi/linux/net-next.git/commit/?id=5a70348e1187c5bf1cbd0ec51843f36befed1c2d'>sierra_net: Add support for IPv6 and Dual-Stack Link Sense Indications</a></td><td>Stefan Brüns</td><td>1</td><td><span class='deletions'>-35</span>/<span class='insertions'>+66</span></td></tr>
<tr class='nohover-highlight'><td/><td colspan='5' class='logmsg'>
If a context is configured as dualstack ("IPv4v6"), the modem indicates
the context activation with a slightly different indication message.
The dual-stack indication omits the link_type (IPv4/v6) and adds
additional address fields.
IPv6 LSIs are identical to IPv4 LSIs, but have a different link type.

Signed-off-by: Stefan Brüns &lt;stefan.bruens@rwth-aachen.de&gt;
Reviewed-by: Bjørn Mork &lt;bjorn@mork.no&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;


</td></tr>
<tr class='logheader'><td><span title='2017-02-09 16:38:48 -0500'>2017-02-09</span></td><td class='logsubject'><a href='/cgit.cgi/linux/net-next.git/commit/?id=98e3862ca2b1ae595a13805dcab4c3a6d7718f4d'>kcm: fix 0-length case for kcm_sendmsg()</a></td><td>WANG Cong</td><td>1</td><td><span class='deletions'>-18</span>/<span class='insertions'>+22</span></td></tr>
<tr class='nohover-highlight'><td/><td colspan='5' class='logmsg'>
Dmitry reported a kernel warning:

 WARNING: CPU: 3 PID: 2936 at net/kcm/kcmsock.c:627
 kcm_write_msgs+0x12e3/0x1b90 net/kcm/kcmsock.c:627
 CPU: 3 PID: 2936 Comm: a.out Not tainted 4.10.0-rc6+ #209
 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
 Call Trace:
  __dump_stack lib/dump_stack.c:15 [inline]
  dump_stack+0x2ee/0x3ef lib/dump_stack.c:51
  panic+0x1fb/0x412 kernel/panic.c:179
  __warn+0x1c4/0x1e0 kernel/panic.c:539
  warn_slowpath_null+0x2c/0x40 kernel/panic.c:582
  kcm_write_msgs+0x12e3/0x1b90 net/kcm/kcmsock.c:627
  kcm_sendmsg+0x163a/0x2200 net/kcm/kcmsock.c:1029
  sock_sendmsg_nosec net/socket.c:635 [inline]
  sock_sendmsg+0xca/0x110 net/socket.c:645
  sock_write_iter+0x326/0x600 net/socket.c:848
  new_sync_write fs/read_write.c:499 [inline]
  __vfs_write+0x483/0x740 fs/read_write.c:512
  vfs_write+0x187/0x530 fs/read_write.c:560
  SYSC_write fs/read_write.c:607 [inline]
  SyS_write+0xfb/0x230 fs/read_write.c:599
  entry_SYSCALL_64_fastpath+0x1f/0xc2

when calling syscall(__NR_write, sock2, 0x208aaf27ul, 0x0ul) on a KCM
seqpacket socket. It appears that kcm_sendmsg() does not handle len==0
case correctly, which causes an empty skb is allocated and queued.
Fix this by skipping the skb allocation for len==0 case.

Reported-by: Dmitry Vyukov &lt;dvyukov@google.com&gt;
Cc: Tom Herbert &lt;tom@herbertland.com&gt;
Signed-off-by: Cong Wang &lt;xiyou.wangcong@gmail.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;


</td></tr>
<tr class='logheader'><td><span title='2017-02-09 16:34:05 -0500'>2017-02-09</span></td><td class='logsubject'><a href='/cgit.cgi/linux/net-next.git/commit/?id=538d92912d3190a1dd809233a0d57277459f37b2'>xen-netfront: Rework the fix for Rx stall during OOM and network stress</a></td><td>Vineeth Remanan Pillai