diff options
| author | Petr Machata <petrm@nvidia.com> | 2025-06-17 00:44:15 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-08-15 12:13:39 +0200 |
| commit | 94927ae3d5c1d65cd4148e91b9ef5482607a9bc3 (patch) | |
| tree | d116ed1fb378486043ef1d1f5b5e970d420b2cb9 /tools/bpf/bpftool/net.c | |
| parent | 443430e67868c7f7d121784de538f93fbc1d59cd (diff) | |
net: ipv6: ip6mr: Fix in/out netdev to pass to the FORWARD chain
[ Upstream commit 3365afd3abda5f6a54f4a822dad5c9314e94c3fc ]
The netfilter hook is invoked with skb->dev for input netdevice, and
vif_dev for output netdevice. However at the point of invocation, skb->dev
is already set to vif_dev, and MR-forwarded packets are reported with
in=out:
# ip6tables -A FORWARD -j LOG --log-prefix '[forw]'
# cd tools/testing/selftests/net/forwarding
# ./router_multicast.sh
# dmesg | fgrep '[forw]'
[ 1670.248245] [forw]IN=v5 OUT=v5 [...]
For reference, IPv4 MR code shows in and out as appropriate.
Fix by caching skb->dev and using the updated value for output netdev.
Fixes: 7bc570c8b4f7 ("[IPV6] MROUTE: Support multicast forwarding.")
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/3141ae8386fbe13fef4b793faa75e6bae58d798a.1750113335.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'tools/bpf/bpftool/net.c')
0 files changed, 0 insertions, 0 deletions