path: root/net/ipv4/tcp_timer.c
diff options
authorYuchung Cheng <ycheng@google.com>2014-09-29 13:20:38 -0700
committerDavid S. Miller <davem@davemloft.net>2014-10-01 16:27:52 -0400
commitb248230c34970a6c1c17c591d63b464e8d2cfc33 (patch)
tree1b87913e6b3dc3574cbe78f7d1736ae4074ebf93 /net/ipv4/tcp_timer.c
parentcipso: add __init to cipso_v4_cache_init (diff)
tcp: abort orphan sockets stalling on zero window probes
Currently we have two different policies for orphan sockets that repeatedly stall on zero window ACKs. If a socket gets a zero window ACK when it is transmitting data, the RTO is used to probe the window. The socket is aborted after roughly tcp_orphan_retries() retries (as in tcp_write_timeout()). But if the socket was idle when it received the zero window ACK, and later wants to send more data, we use the probe timer to probe the window. If the receiver always returns zero window ACKs, icsk_probes keeps getting reset in tcp_ack() and the orphan socket can stall forever until the system reaches the orphan limit (as commented in tcp_probe_timer()). This opens up a simple attack to create lots of hanging orphan sockets to burn the memory and the CPU, as demonstrated in the recent netdev post "TCP connection will hang in FIN_WAIT1 after closing if zero window is advertised." http://www.spinics.net/lists/netdev/msg296539.html This patch follows the design in RTO-based probe: we abort an orphan socket stalling on zero window when the probe timer reaches both the maximum backoff and the maximum RTO. For example, an 100ms RTT connection will timeout after roughly 153 seconds (0.3 + 0.6 + .... + 76.8) if the receiver keeps the window shut. If the orphan socket passes this check, but the system already has too many orphans (as in tcp_out_of_resources()), we still abort it but we'll also send an RST packet as the connection may still be active. In addition, we change TCP_USER_TIMEOUT to cover (life or dead) sockets stalled on zero-window probes. This changes the semantics of TCP_USER_TIMEOUT slightly because it previously only applies when the socket has pending transmission. Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Neal Cardwell <ncardwell@google.com> Reported-by: Andrey Dmitrov <andrey.dmitrov@oktetlabs.ru> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
1 files changed, 21 insertions, 20 deletions
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index b24360f6e293..9b21ae8b2e31 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -52,7 +52,7 @@ static void tcp_write_err(struct sock *sk)
* limit.
* 2. If we have strong memory pressure.
-static int tcp_out_of_resources(struct sock *sk, int do_reset)
+static int tcp_out_of_resources(struct sock *sk, bool do_reset)
struct tcp_sock *tp = tcp_sk(sk);
int shift = 0;
@@ -72,7 +72,7 @@ static int tcp_out_of_resources(struct sock *sk, int do_reset)
if ((s32)(tcp_time_stamp - tp->lsndtime) <= TCP_TIMEWAIT_LEN ||
/* 2. Window is closed. */
(!tp->snd_wnd && !tp->packets_out))
- do_reset = 1;
+ do_reset = true;
if (do_reset)
tcp_send_active_reset(sk, GFP_ATOMIC);
@@ -270,40 +270,41 @@ static void tcp_probe_timer(struct sock *sk)
struct inet_connection_sock *icsk = inet_csk(sk);
struct tcp_sock *tp = tcp_sk(sk);
int max_probes;
+ u32 start_ts;
if (tp->packets_out || !tcp_send_head(sk)) {
icsk->icsk_probes_out = 0;
- /* *WARNING* RFC 1122 forbids this
- *
- * It doesn't AFAIK, because we kill the retransmit timer -AK
- *
- * FIXME: We ought not to do it, Solaris 2.5 actually has fixing
- * this behaviour in Solaris down as a bug fix. [AC]
- *
- * Let me to explain. icsk_probes_out is zeroed by incoming ACKs
- * even if they advertise zero window. Hence, connection is killed only
- * if we received no ACKs for normal connection timeout. It is not killed
- * only because window stays zero for some time, window may be zero
- * until armageddon and even later. We are in full accordance
- * with RFCs, only probe timer combines both retransmission timeout
- * and probe timeout in one bottle. --ANK
+ /* RFC 1122 requires the sender to stay open indefinitely as
+ * long as the receiver continues to respond probes. We support this by
+ * default and reset icsk_probes_out with incoming ACKs. But if the
+ * socket is orphaned or the user specifies TCP_USER_TIMEOUT, we
+ * kill the socket when the retry count and the time exceeds the
+ * corresponding system limit. We also implement similar policy when
+ * we use RTO to probe window in tcp_retransmit_timer().
- max_probes = sysctl_tcp_retries2;
+ start_ts = tcp_skb_timestamp(tcp_send_head(sk));
+ if (!start_ts)
+ skb_mstamp_get(&tcp_send_head(sk)->skb_mstamp);
+ else if (icsk->icsk_user_timeout &&
+ (s32)(tcp_time_stamp - start_ts) > icsk->icsk_user_timeout)
+ goto abort;
+ max_probes = sysctl_tcp_retries2;
if (sock_flag(sk, SOCK_DEAD)) {
const int alive = inet_csk_rto_backoff(icsk, TCP_RTO_MAX) < TCP_RTO_MAX;
max_probes = tcp_orphan_retries(sk, alive);
- if (tcp_out_of_resources(sk, alive || icsk->icsk_probes_out <= max_probes))
+ if (!alive && icsk->icsk_backoff >= max_probes)
+ goto abort;
+ if (tcp_out_of_resources(sk, true))
if (icsk->icsk_probes_out > max_probes) {
- tcp_write_err(sk);
+abort: tcp_write_err(sk);
} else {
/* Only send another probe if we didn't close things up. */