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| author | Ido Schimmel <idosch@mellanox.com> | 2016-07-22 14:56:20 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-07-25 10:53:34 -0700 |
| commit | baedbe55884c003819f5c8c063ec3d2569414296 (patch) | |
| tree | 0778408bcb11dd58c0cfd6588a9da2b6bc0d8bc8 /net/bridge | |
| parent | 9b97420228881e839b76c8a4506da3cb187bf004 (diff) | |
| download | linux-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/bridge')
| -rw-r--r-- | net/bridge/br_input.c | 8 |
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; |