diff options
| author | Florian Westphal <fw@strlen.de> | 2020-12-10 14:43:23 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2020-12-12 11:44:42 +0100 |
| commit | 86d21fc7474563cb5d054ff001d8ad7b69206717 (patch) | |
| tree | 764484f42898dea88f33e2063f6dd23b383deaa4 /net/netfilter/nf_conntrack_proto_tcp.c | |
| parent | 04295878beac396dae47ba93141cae0d9386e7ef (diff) | |
| download | linux-86d21fc7474563cb5d054ff001d8ad7b69206717.tar.gz | |
netfilter: ctnetlink: add timeout and protoinfo to destroy events
DESTROY events do not include the remaining timeout.
Add the timeout if the entry was removed explicitly. This can happen
when a conntrack gets deleted prematurely, e.g. due to a tcp reset,
module removal, netdev notifier (nat/masquerade device went down),
ctnetlink and so on.
Add the protocol state too for the destroy message to check for abnormal
state on connection termination.
Joint work with Pablo.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/nf_conntrack_proto_tcp.c')
| -rw-r--r-- | net/netfilter/nf_conntrack_proto_tcp.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c index 811c6c9b59e17..1d7e1c5955463 100644 --- a/net/netfilter/nf_conntrack_proto_tcp.c +++ b/net/netfilter/nf_conntrack_proto_tcp.c @@ -1186,7 +1186,7 @@ static bool tcp_can_early_drop(const struct nf_conn *ct) #include <linux/netfilter/nfnetlink_conntrack.h> static int tcp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, - struct nf_conn *ct) + struct nf_conn *ct, bool destroy) { struct nlattr *nest_parms; struct nf_ct_tcp_flags tmp = {}; @@ -1196,8 +1196,13 @@ static int tcp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, if (!nest_parms) goto nla_put_failure; - if (nla_put_u8(skb, CTA_PROTOINFO_TCP_STATE, ct->proto.tcp.state) || - nla_put_u8(skb, CTA_PROTOINFO_TCP_WSCALE_ORIGINAL, + if (nla_put_u8(skb, CTA_PROTOINFO_TCP_STATE, ct->proto.tcp.state)) + goto nla_put_failure; + + if (destroy) + goto skip_state; + + if (nla_put_u8(skb, CTA_PROTOINFO_TCP_WSCALE_ORIGINAL, ct->proto.tcp.seen[0].td_scale) || nla_put_u8(skb, CTA_PROTOINFO_TCP_WSCALE_REPLY, ct->proto.tcp.seen[1].td_scale)) @@ -1212,8 +1217,8 @@ static int tcp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, if (nla_put(skb, CTA_PROTOINFO_TCP_FLAGS_REPLY, sizeof(struct nf_ct_tcp_flags), &tmp)) goto nla_put_failure; +skip_state: spin_unlock_bh(&ct->lock); - nla_nest_end(skb, nest_parms); return 0; |