netfilter: nft_payload: rebuild vlan header on h_proto access

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[ Upstream commit af84f9e447 ]

nft can perform merging of adjacent payload requests.
This means that:

ether saddr 00:11 ... ether type 8021ad ...

is a single payload expression, for 8 bytes, starting at the
ethernet source offset.

Check that offset+length is fully within the source/destination mac
addersses.

This bug prevents 'ether type' from matching the correct h_proto in case
vlan tag got stripped.

Fixes: de6843be30 ("netfilter: nft_payload: rebuild vlan header when needed")
Reported-by: David Ward <david.ward@ll.mit.edu>
Signed-off-by: Florian Westphal <fw@strlen.de>
Stable-dep-of: 33c563ebf8 ("netfilter: nft_payload: skbuff vlan metadata mangle support")
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Florian Westphal 2023-09-29 10:42:10 +02:00 • committed by Greg Kroah-Hartman

parent ae4053a6d4

commit 8312923739

1 changed files with 12 additions and 1 deletions

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net/netfilter/nft_payload.c

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