diff options
| author | Vladimir Oltean | 2023-07-01 01:20:10 +0300 |
|---|---|---|
| committer | David S. Miller | 2023-07-03 09:12:30 +0100 |
| commit | a398b9ea0c3b791b7a0f4c6029a62cf628f97f22 (patch) | |
| tree | d29ccd92f96df0aae7eeb07731ac62f9c3a8e857 /net | |
| parent | 6ca3c005d0604e8d2b439366e3923ea58db99641 (diff) | |
net: dsa: tag_sja1105: fix source port decoding in vlan_filtering=0 bridge mode
There was a regression introduced by the blamed commit, where pinging to
a VLAN-unaware bridge would fail with the repeated message "Couldn't
decode source port" coming from the tagging protocol driver.
When receiving packets with a bridge_vid as determined by
dsa_tag_8021q_bridge_join(), dsa_8021q_rcv() will decode:
- source_port = 0 (which isn't really valid, more like "don't know")
- switch_id = 0 (which isn't really valid, more like "don't know")
- vbid = value in range 1-7
Since the blamed patch has reversed the order of the checks, we are now
going to believe that source_port != -1 and switch_id != -1, so they're
valid, but they aren't.
The minimal solution to the problem is to only populate source_port and
switch_id with what dsa_8021q_rcv() came up with, if the vbid is zero,
i.e. the source port information is trustworthy.
Fixes: c1ae02d87689 ("net: dsa: tag_sja1105: always prefer source port information from INCL_SRCPT")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/dsa/tag_sja1105.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/net/dsa/tag_sja1105.c b/net/dsa/tag_sja1105.c index 92a626a05e82..db0a6ac67470 100644 --- a/net/dsa/tag_sja1105.c +++ b/net/dsa/tag_sja1105.c @@ -573,11 +573,14 @@ static struct sk_buff *sja1105_rcv(struct sk_buff *skb, * if available. This allows us to not overwrite a valid source * port and switch ID with zeroes when receiving link-local * frames from a VLAN-unaware bridged port (non-zero vbid) or a - * VLAN-aware bridged port (non-zero vid). + * VLAN-aware bridged port (non-zero vid). Furthermore, the + * tag_8021q source port information is only of trust when the + * vbid is 0 (precise port). Otherwise, tmp_source_port and + * tmp_switch_id will be zeroes. */ - if (source_port == -1) + if (vbid == 0 && source_port == -1) source_port = tmp_source_port; - if (switch_id == -1) + if (vbid == 0 && switch_id == -1) switch_id = tmp_switch_id; } else if (source_port == -1 && switch_id == -1) { /* Packets with no source information have no chance of |