mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-04 18:09:57 +00:00
![]() For starters, the bridge netfilter code registers operations that
are invoked any time nh_hook is called. Specifically, ip_sabotage_in
watches for nested calls for NF_INET_PRE_ROUTING when a bridge is in
the stack.
Packet wise, the bridge netfilter hook runs first. br_nf_pre_routing
allocates nf_bridge, sets in_prerouting to 1 and calls NF_HOOK for
NF_INET_PRE_ROUTING. It's finish function, br_nf_pre_routing_finish,
then resets in_prerouting flag to 0 and the packet continues up the
stack. The packet eventually makes it to the VRF driver and it invokes
nf_hook for NF_INET_PRE_ROUTING in case any rules have been added against
the vrf device.
Because of the registered operations the call to nf_hook causes
ip_sabotage_in to be invoked. That function sees the nf_bridge on the
skb and that in_prerouting is not set. Thinking it is an invalid nested
call it steals (drops) the packet.
Update ip_sabotage_in to recognize that the bridge or one of its upper
devices (e.g., vlan) can be enslaved to a VRF (L3 master device) and
allow the packet to go through the nf_hook a second time.
Fixes:
|
||
---|---|---|
.. | ||
netfilter | ||
br.c | ||
br_arp_nd_proxy.c | ||
br_device.c | ||
br_fdb.c | ||
br_forward.c | ||
br_if.c | ||
br_input.c | ||
br_ioctl.c | ||
br_mdb.c | ||
br_multicast.c | ||
br_netfilter_hooks.c | ||
br_netfilter_ipv6.c | ||
br_netlink.c | ||
br_netlink_tunnel.c | ||
br_nf_core.c | ||
br_private.h | ||
br_private_stp.h | ||
br_private_tunnel.h | ||
br_stp.c | ||
br_stp_bpdu.c | ||
br_stp_if.c | ||
br_stp_timer.c | ||
br_switchdev.c | ||
br_sysfs_br.c | ||
br_sysfs_if.c | ||
br_vlan.c | ||
br_vlan_tunnel.c | ||
Kconfig | ||
Makefile |