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netfilter: flowtable: teardown flow if cached mtu is stale

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Tear down the flow entry in the unlikely case that the interface mtu
changes, this gives the flow a chance to refresh the cached mtu,
otherwise such refresh does not occur until flow entry expires.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2025-01-14 00:50:37 +01:00
parent 03428ca5ce
commit b8baac3b9c
1 changed files with 6 additions and 2 deletions
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8
net/netfilter/nf_flow_table_ip.c
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@ -377,8 +377,10 @@ static int nf_flow_offload_forward(struct nf_flowtable_ctx *ctx,
flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]);
mtu = flow->tuplehash[dir].tuple.mtu + ctx->offset;
if (unlikely(nf_flow_exceeds_mtu(skb, mtu)))
if (unlikely(nf_flow_exceeds_mtu(skb, mtu))) {
flow_offload_teardown(flow);
return 0;
}
iph = (struct iphdr *)(skb_network_header(skb) + ctx->offset);
thoff = (iph->ihl * 4) + ctx->offset;
@ -656,8 +658,10 @@ static int nf_flow_offload_ipv6_forward(struct nf_flowtable_ctx *ctx,
flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]);
mtu = flow->tuplehash[dir].tuple.mtu + ctx->offset;
if (unlikely(nf_flow_exceeds_mtu(skb, mtu)))
if (unlikely(nf_flow_exceeds_mtu(skb, mtu))) {
flow_offload_teardown(flow);
return 0;
}
ip6h = (struct ipv6hdr *)(skb_network_header(skb) + ctx->offset);
thoff = sizeof(*ip6h) + ctx->offset;