This is a note to let you know that I've just added the patch titled

netfilter: nft_meta: deal with PACKET_LOOPBACK in netdev family

to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: netfilter-nft_meta-deal-with-packet_loopback-in-netdev-family.patch and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Thu Nov 9 18:22:51 CET 2017

From: Liping Zhang zlpnobody@gmail.com Date: Sat, 7 Jan 2017 21:33:55 +0800 Subject: netfilter: nft_meta: deal with PACKET_LOOPBACK in netdev family

From: Liping Zhang zlpnobody@gmail.com

[ Upstream commit f169fd695b192dd7b23aff8e69d25a1bc881bbfa ]

After adding the following nft rule, then ping 224.0.0.1: # nft add rule netdev t c pkttype host counter

The warning complain message will be printed out again and again: WARNING: CPU: 0 PID: 10182 at net/netfilter/nft_meta.c:163 \ nft_meta_get_eval+0x3fe/0x460 [nft_meta] [...] Call Trace: <IRQ> dump_stack+0x85/0xc2 __warn+0xcb/0xf0 warn_slowpath_null+0x1d/0x20 nft_meta_get_eval+0x3fe/0x460 [nft_meta] nft_do_chain+0xff/0x5e0 [nf_tables]

So we should deal with PACKET_LOOPBACK in netdev family too. For ipv4, convert it to PACKET_BROADCAST/MULTICAST according to the destination address's type; For ipv6, convert it to PACKET_MULTICAST directly.

Signed-off-by: Liping Zhang zlpnobody@gmail.com Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/netfilter/nft_meta.c | 28 +++++++++++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-)

--- a/net/netfilter/nft_meta.c +++ b/net/netfilter/nft_meta.c @@ -151,8 +151,34 @@ void nft_meta_get_eval(const struct nft_ else *dest = PACKET_BROADCAST; break; + case NFPROTO_NETDEV: + switch (skb->protocol) { + case htons(ETH_P_IP): { + int noff = skb_network_offset(skb); + struct iphdr *iph, _iph; + + iph = skb_header_pointer(skb, noff, + sizeof(_iph), &_iph); + if (!iph) + goto err; + + if (ipv4_is_multicast(iph->daddr)) + *dest = PACKET_MULTICAST; + else + *dest = PACKET_BROADCAST; + + break; + } + case htons(ETH_P_IPV6): + *dest = PACKET_MULTICAST; + break; + default: + WARN_ON_ONCE(1); + goto err; + } + break; default: - WARN_ON(1); + WARN_ON_ONCE(1); goto err; } break;

Patches currently in stable-queue which might be from zlpnobody@gmail.com are

queue-4.4/netfilter-nft_meta-deal-with-packet_loopback-in-netdev-family.patch