Thread (13 messages) 13 messages, 3 authors, 2021-03-07
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[PATCH net 4/9] netfilter: conntrack: avoid misleading 'invalid' in log message

From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: 2021-03-06 12:13:23
Also in: netfilter-devel
Subsystem: netfilter, networking [general], the rest · Maintainers: Pablo Neira Ayuso, Florian Westphal, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds 

From: Florian Westphal <fw@strlen.de>

The packet is not flagged as invalid: conntrack will accept it and
its associated with the conntrack entry.

This happens e.g. when receiving a retransmitted SYN in SYN_RECV state.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_conntrack_proto_tcp.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index 1d7e1c595546..ec23330687a5 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -982,8 +982,10 @@ int nf_conntrack_tcp_packet(struct nf_conn *ct,
 					IP_CT_EXP_CHALLENGE_ACK;
 		}
 		spin_unlock_bh(&ct->lock);
-		nf_ct_l4proto_log_invalid(skb, ct, "invalid packet ignored in "
-					  "state %s ", tcp_conntrack_names[old_state]);
+		nf_ct_l4proto_log_invalid(skb, ct,
+					  "packet (index %d) in dir %d ignored, state %s",
+					  index, dir,
+					  tcp_conntrack_names[old_state]);
 		return NF_ACCEPT;
 	case TCP_CONNTRACK_MAX:
 		/* Special case for SYN proxy: when the SYN to the server or
-- 
2.20.1
Other recent patches touching these files
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