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netfilter: flowtable: call dst_check() to fall back to classic forwarding 

In case the route is stale, pass up the packet to the classic forwarding
path for re-evaluation and schedule this flow entry for removal.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2021-03-17 15:55:28 +01:00
parent f4401262b9
commit e5075c0bad
1 changed files with 2 additions and 10 deletions
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12
net/netfilter/nf_flow_table_ip.c
View File

@ -197,14 +197,6 @@ static bool nf_flow_exceeds_mtu(const struct sk_buff *skb, unsigned int mtu)
return true;
}
static int nf_flow_offload_dst_check(struct dst_entry *dst)
{
if (unlikely(dst_xfrm(dst)))
return dst_check(dst, 0) ? 0 : -1;
return 0;
}
static unsigned int nf_flow_xmit_xfrm(struct sk_buff *skb,
const struct nf_hook_state *state,
struct dst_entry *dst)
@ -256,7 +248,7 @@ nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,
flow_offload_refresh(flow_table, flow);
if (nf_flow_offload_dst_check(&rt->dst)) {
if (!dst_check(&rt->dst, 0)) {
flow_offload_teardown(flow);
return NF_ACCEPT;
}
@ -476,7 +468,7 @@ nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,
flow_offload_refresh(flow_table, flow);
if (nf_flow_offload_dst_check(&rt->dst)) {
if (!dst_check(&rt->dst, 0)) {
flow_offload_teardown(flow);
return NF_ACCEPT;
}