From 48f611ecea0e67ba2065074e2c0f20bfcb860f85 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Tue, 21 May 2019 13:24:31 +0200 Subject: [PATCH] netfilter: nft_flow_offload: set liberal tracking mode for tcp commit 8437a6209f76f85a2db1abb12a9bde2170801617 upstream. Without it, whenever a packet has to be pushed up the stack (e.g. because of mtu mismatch), then conntrack will flag packets as invalid, which in turn breaks NAT. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso Signed-off-by: Greg Kroah-Hartman --- net/netfilter/nft_flow_offload.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/net/netfilter/nft_flow_offload.c b/net/netfilter/nft_flow_offload.c index 7f85af4..b637293 100644 --- a/net/netfilter/nft_flow_offload.c +++ b/net/netfilter/nft_flow_offload.c @@ -72,6 +72,7 @@ static void nft_flow_offload_eval(const struct nft_expr *expr, struct nf_flow_route route; struct flow_offload *flow; enum ip_conntrack_dir dir; + bool is_tcp = false; struct nf_conn *ct; int ret; @@ -84,6 +85,8 @@ static void nft_flow_offload_eval(const struct nft_expr *expr, switch (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum) { case IPPROTO_TCP: + is_tcp = true; + break; case IPPROTO_UDP: break; default: @@ -109,6 +112,11 @@ static void nft_flow_offload_eval(const struct nft_expr *expr, if (!flow) goto err_flow_alloc; + if (is_tcp) { + ct->proto.tcp.seen[0].flags |= IP_CT_TCP_FLAG_BE_LIBERAL; + ct->proto.tcp.seen[1].flags |= IP_CT_TCP_FLAG_BE_LIBERAL; + } + ret = flow_offload_add(flowtable, flow); if (ret < 0) goto err_flow_add; -- 2.7.4