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| author | Qingqing Yang <qingqing.yang@broadcom.com> | 2022-09-19 15:48:08 +0800 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-09-21 18:36:57 -0700 |
| commit | 9f87eb4246994e32a4e4ea88476b20ab3b412840 (patch) | |
| tree | 5a4a2ac2edc54597f4dba5499f36b78bd95f0880 /net/core | |
| parent | 1d14b30b5a5e52da93467af7c1dca08f124186df (diff) | |
| download | linux-9f87eb4246994e32a4e4ea88476b20ab3b412840.tar.bz2 | |
flow_dissector: Do not count vlan tags inside tunnel payload
We've met the problem that when there is a vlan tag inside
GRE encapsulation, the match of num_of_vlans fails.
It is caused by the vlan tag inside GRE payload has been
counted into num_of_vlans, which is not expected.
One example packet is like this:
Ethernet II, Src: Broadcom_68:56:07 (00:10:18:68:56:07)
Dst: Broadcom_68:56:08 (00:10:18:68:56:08)
802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 100
Internet Protocol Version 4, Src: 192.168.1.4, Dst: 192.168.1.200
Generic Routing Encapsulation (Transparent Ethernet bridging)
Ethernet II, Src: Broadcom_68:58:07 (00:10:18:68:58:07)
Dst: Broadcom_68:58:08 (00:10:18:68:58:08)
802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 200
...
It should match the (num_of_vlans 1) rule, but it matches
the (num_of_vlans 2) rule.
The vlan tags inside the GRE or other tunnel encapsulated payload
should not be taken into num_of_vlans.
The fix is to stop counting the vlan number when the encapsulation
bit is set.
Fixes: 34951fcf26c5 ("flow_dissector: Add number of vlan tags dissector")
Signed-off-by: Qingqing Yang <qingqing.yang@broadcom.com>
Reviewed-by: Boris Sukholitko <boris.sukholitko@broadcom.com>
Link: https://lore.kernel.org/r/20220919074808.136640-1-qingqing.yang@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/flow_dissector.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c index 2a1f513a2dc8..9671d79dd986 100644 --- a/net/core/flow_dissector.c +++ b/net/core/flow_dissector.c @@ -1201,8 +1201,8 @@ proto_again: nhoff += sizeof(*vlan); } - if (dissector_uses_key(flow_dissector, - FLOW_DISSECTOR_KEY_NUM_OF_VLANS)) { + if (dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_NUM_OF_VLANS) && + !(key_control->flags & FLOW_DIS_ENCAPSULATION)) { struct flow_dissector_key_num_of_vlans *key_nvs; key_nvs = skb_flow_dissector_target(flow_dissector, |