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netfilter: nft_flow_offload: fix interaction with vrf slave device

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In the forward chain, the iif is changed from slave device to master vrf
device. Thus, flow offload does not find a match on the lower slave
device.

This patch uses the cached route, ie. dst->dev, to update the iif and
oif fields in the flow entry.

After this patch, the following example works fine:

 # ip addr add dev eth0 1.1.1.1/24
 # ip addr add dev eth1 10.0.0.1/24
 # ip link add user1 type vrf table 1
 # ip l set user1 up
 # ip l set dev eth0 master user1
 # ip l set dev eth1 master user1

 # nft add table firewall
 # nft add flowtable f fb1 { hook ingress priority 0 \; devices = { eth0, eth1 } \; }
 # nft add chain f ftb-all {type filter hook forward priority 0 \; policy accept \; }
 # nft add rule f ftb-all ct zone 1 ip protocol tcp flow offload @fb1
 # nft add rule f ftb-all ct zone 1 ip protocol udp flow offload @fb1

Signed-off-by: wenxu <wenxu@ucloud.cn>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
wenxu
2019-01-10 14:51:35 +08:00
committed by Pablo Neira Ayuso
parent e2c8d550a9
commit 10f4e76587
3 changed files with 5 additions and 5 deletions
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1
include/net/netfilter/nf_flow_table.h
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@@ -84,7 +84,6 @@ struct flow_offload {
struct nf_flow_route {
struct {
struct dst_entry *dst;
int ifindex;
} tuple[FLOW_OFFLOAD_DIR_MAX];
};