The problem I'm trying to solve is that when packets being sent from one
bridged interface to the other are "brouted" they get dropped by the IP layer.
The reason is that the packet being raised has pkt_type of type
PACKET_OTHERHOST.
The semantics of "brouting" a packet is that it is sent up to higher network
layers. Problem is that when the pkt_type of the packet is
PACKET_OTHERHOST it (at least for IP) gets dropped. (e.g. dropping OTHERHOST
packets is the first thing ip_rcv() does).
The suggested patch below changes the packet type to PACKET_HOST which fixes
the problem. This is a bit of a cheat but I didn't find any side effects and
couldn't find a better way w/o defining a new packet type.
Also removed " dest = eth_hdr(skb)->h_dest;" which does nothing as far as I can
see as it is already assigned the same value before.
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index f921a5d..2cae324 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -291,12 +291,11 @@ forward:
switch (p->state) {
case BR_STATE_FORWARDING:
rhook = rcu_dereference(br_should_route_hook);
- if (rhook) {
- if ((*rhook)(skb)) {
- *pskb = skb;
- return RX_HANDLER_PASS;
- }
- dest = eth_hdr(skb)->h_dest;
+ if (rhook && (*rhook)(skb)) {
+ if (skb->pkt_type == PACKET_OTHERHOST)
+ skb->pkt_type = PACKET_HOST; /* so it does not get
rejected by higher protocol receiver, e.g. by ip_rcv() */
+ *pskb = skb;
+ return RX_HANDLER_PASS;
}
/* fall through */
case BR_STATE_LEARNING:
--
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