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authorIdo Schimmel <idosch@mellanox.com>2016-07-22 14:56:20 +0300
committerDavid S. Miller <davem@davemloft.net>2016-07-25 10:53:34 -0700
commitbaedbe55884c003819f5c8c063ec3d2569414296 (patch)
tree0778408bcb11dd58c0cfd6588a9da2b6bc0d8bc8 /net
parent9b97420228881e839b76c8a4506da3cb187bf004 (diff)
downloadlinux-baedbe55884c003819f5c8c063ec3d2569414296.tar.bz2
bridge: Fix incorrect re-injection of LLDP packets
Commit 8626c56c8279 ("bridge: fix potential use-after-free when hook returns QUEUE or STOLEN verdict") caused LLDP packets arriving through a bridge port to be re-injected to the Rx path with skb->dev set to the bridge device, but this breaks the lldpad daemon. The lldpad daemon opens a packet socket with protocol set to ETH_P_LLDP for any valid device on the system, which doesn't not include soft devices such as bridge and VLAN. Since packet sockets (ptype_base) are processed in the Rx path after the Rx handler, LLDP packets with skb->dev set to the bridge device never reach the lldpad daemon. Fix this by making the bridge's Rx handler re-inject LLDP packets with RX_HANDLER_PASS, which effectively restores the behaviour prior to the mentioned commit. This means netfilter will never receive LLDP packets coming through a bridge port, as I don't see a way in which we can have okfn() consume the packet without breaking existing behaviour. I've already carried out a similar fix for STP packets in commit 56fae404fb2c ("bridge: Fix incorrect re-injection of STP packets"). Fixes: 8626c56c8279 ("bridge: fix potential use-after-free when hook returns QUEUE or STOLEN verdict") Signed-off-by: Ido Schimmel <idosch@mellanox.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Cc: Florian Westphal <fw@strlen.de> Cc: John Fastabend <john.fastabend@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/bridge/br_input.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 8b08eec763a5..8e486203d133 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -283,6 +283,14 @@ rx_handler_result_t br_handle_frame(struct sk_buff **pskb)
case 0x01: /* IEEE MAC (Pause) */
goto drop;
+ case 0x0E: /* 802.1AB LLDP */
+ fwd_mask |= p->br->group_fwd_mask;
+ if (fwd_mask & (1u << dest[5]))
+ goto forward;
+ *pskb = skb;
+ __br_handle_local_finish(skb);
+ return RX_HANDLER_PASS;
+
default:
/* Allow selective forwarding for most other protocols */
fwd_mask |= p->br->group_fwd_mask;