mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-11-01 08:58:07 +00:00
Code Issues Releases Wiki Activity

net: dsa: refuse cross-chip mirroring operations

Browse source 
In case of a tc mirred action from one switch to another, the behavior
is not correct. We simply tell the source switch driver to program a
mirroring entry towards mirror->to_local_port = to_dp->index, but it is
not even guaranteed that the to_dp belongs to the same switch as dp.

For proper cross-chip support, we would need to go through the
cross-chip notifier layer in switch.c, program the entry on cascade
ports, and introduce new, explicit API for cross-chip mirroring, given
that intermediary switches should have introspection into the DSA tags
passed through the cascade port (and not just program a port mirror on
the entire cascade port). None of that exists today.

Reject what is not implemented so that user space is not misled into
thinking it works.

Fixes: f50f212749 ("net: dsa: Add plumbing for port mirroring")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20241008094320.3340980-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Vladimir Oltean 2024-10-08 12:43:20 +03:00 committed by Jakub Kicinski
parent 6be063071a
commit 8c924369cb
1 changed files with 8 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
net/dsa/user.c
View file

@ -1392,6 +1392,14 @@ dsa_user_add_cls_matchall_mirred(struct net_device *dev,
if (!dsa_user_dev_check(act->dev))
return -EOPNOTSUPP;
to_dp = dsa_user_to_port(act->dev);
if (dp->ds != to_dp->ds) {
NL_SET_ERR_MSG_MOD(extack,
"Cross-chip mirroring not implemented");
return -EOPNOTSUPP;
}
mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
if (!mall_tc_entry)
return -ENOMEM;
@ -1399,9 +1407,6 @@ dsa_user_add_cls_matchall_mirred(struct net_device *dev,
mall_tc_entry->cookie = cls->cookie;
mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
mirror = &mall_tc_entry->mirror;
to_dp = dsa_user_to_port(act->dev);
mirror->to_local_port = to_dp->index;
mirror->ingress = ingress;