diff options
| author | ru <ru@FreeBSD.org> | 1999-09-09 13:42:51 +0000 |
|---|---|---|
| committer | ru <ru@FreeBSD.org> | 1999-09-09 13:42:51 +0000 |
| commit | 55c2ca09dd8546fb9707d8129e1ab6a14a4e3220 (patch) | |
| tree | 17b39786b5549cc03d3e84bff77546d9338f9868 /sys/netinet | |
| parent | 8c159df6ce34e4487fbb9a9b574a183f21cedf61 (diff) | |
| download | FreeBSD-src-55c2ca09dd8546fb9707d8129e1ab6a14a4e3220.zip FreeBSD-src-55c2ca09dd8546fb9707d8129e1ab6a14a4e3220.tar.gz | |
Handle TCP reset sequence properly.
In the words of originator:
:If an incoming connection is initiated through natd and deny_incoming is
:not set, then a new alias_link structure is created to handle the link.
:If there is nothing listening for the incoming connection, then the kernel
:responds with a RST for the connection. However, this is not processed
:correctly in libalias/alias.c:TcpMonitor{In,Out} and
:libalias/alias_db.c:SetState{In,Out} as it thinks a connection
:has been established and therefore applies a timeout of 86400 seconds
:to the link.
:
:If many of these half-connections are initiated (during, for example, a
:port scan of the host), then many thousands of unnecessary links are
:created and the resident size of natd balloons to 20MB or more.
PR: 13639
Reviewed by: brian
Diffstat (limited to 'sys/netinet')
| -rw-r--r-- | sys/netinet/libalias/alias.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/netinet/libalias/alias.c b/sys/netinet/libalias/alias.c index af0f50c..3808912 100644 --- a/sys/netinet/libalias/alias.c +++ b/sys/netinet/libalias/alias.c @@ -142,7 +142,7 @@ TcpMonitorIn(struct ip *pip, struct alias_link *link) case ALIAS_TCP_STATE_NOT_CONNECTED: if (tc->th_flags & TH_SYN) SetStateIn(link, ALIAS_TCP_STATE_CONNECTED); - break; + /*FALLTHROUGH*/ case ALIAS_TCP_STATE_CONNECTED: if (tc->th_flags & TH_FIN || tc->th_flags & TH_RST) @@ -163,7 +163,7 @@ TcpMonitorOut(struct ip *pip, struct alias_link *link) case ALIAS_TCP_STATE_NOT_CONNECTED: if (tc->th_flags & TH_SYN) SetStateOut(link, ALIAS_TCP_STATE_CONNECTED); - break; + /*FALLTHROUGH*/ case ALIAS_TCP_STATE_CONNECTED: if (tc->th_flags & TH_FIN || tc->th_flags & TH_RST) |
