tcp: mitigate ACK loops for connections as tcp_sock

Ensure that in state ESTABLISHED, where the connection is represented
by a tcp_sock, we rate limit dupacks in response to incoming packets
(a) with TCP timestamps that fail PAWS checks, or (b) with sequence
numbers or ACK numbers that are out of the acceptable window.

We do not send a dupack in response to out-of-window packets if it has
been less than sysctl_tcp_invalid_ratelimit (default 500ms) since we
last sent a dupack in response to an out-of-window packet.

There is already a similar (although global) rate-limiting mechanism
for "challenge ACKs". When deciding whether to send a challence ACK,
we first consult the new per-connection rate limit, and then the
global rate limit.

Reported-by: Avery Fay <avery@mixpanel.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index bcc828d3b9b965188e299d2af02c6333b4bcd9d1..66d85a80a1ec551d4dfbe44a4f7d1ee1fd97e7ee 100644 (file)
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -153,6 +153,7 @@ struct tcp_sock {
        u32     snd_sml;        /* Last byte of the most recently transmitted small packet */
        u32     rcv_tstamp;     /* timestamp of last received ACK (for keepalives) */
        u32     lsndtime;       /* timestamp of last sent data packet (for restart window) */
+       u32     last_oow_ack_time;  /* timestamp of last out-of-window ACK */
 
        u32     tsoffset;       /* timestamp offset */
 

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 9401aa43b81407df95721a42bd129d04bdb9b132..8fdd27b173061def484663beeace691a8bfa2365 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3322,13 +3322,22 @@ static int tcp_ack_update_window(struct sock *sk, const struct sk_buff *skb, u32
 }
 
 /* RFC 5961 7 [ACK Throttling] */
-static void tcp_send_challenge_ack(struct sock *sk)
+static void tcp_send_challenge_ack(struct sock *sk, const struct sk_buff *skb)
 {
        /* unprotected vars, we dont care of overwrites */
        static u32 challenge_timestamp;
        static unsigned int challenge_count;
-       u32 now = jiffies / HZ;
+       struct tcp_sock *tp = tcp_sk(sk);
+       u32 now;
+
+       /* First check our per-socket dupack rate limit. */
+       if (tcp_oow_rate_limited(sock_net(sk), skb,
+                                LINUX_MIB_TCPACKSKIPPEDCHALLENGE,
+                                &tp->last_oow_ack_time))
+               return;
 
+       /* Then check the check host-wide RFC 5961 rate limit. */
+       now = jiffies / HZ;
        if (now != challenge_timestamp) {
                challenge_timestamp = now;
                challenge_count = 0;
@@ -3424,7 +3433,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
        if (before(ack, prior_snd_una)) {
                /* RFC 5961 5.2 [Blind Data Injection Attack].[Mitigation] */
                if (before(ack, prior_snd_una - tp->max_window)) {
-                       tcp_send_challenge_ack(sk);
+                       tcp_send_challenge_ack(sk, skb);
                        return -1;
                }
                goto old_ack;
@@ -4993,7 +5002,10 @@ static bool tcp_validate_incoming(struct sock *sk, struct sk_buff *skb,
            tcp_paws_discard(sk, skb)) {
                if (!th->rst) {
                        NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSESTABREJECTED);
-                       tcp_send_dupack(sk, skb);
+                       if (!tcp_oow_rate_limited(sock_net(sk), skb,
+                                                 LINUX_MIB_TCPACKSKIPPEDPAWS,
+                                                 &tp->last_oow_ack_time))
+                               tcp_send_dupack(sk, skb);
                        goto discard;
                }
                /* Reset is accepted even if it did not pass PAWS. */
@@ -5010,7 +5022,10 @@ static bool tcp_validate_incoming(struct sock *sk, struct sk_buff *skb,
                if (!th->rst) {
                        if (th->syn)
                                goto syn_challenge;
-                       tcp_send_dupack(sk, skb);
+                       if (!tcp_oow_rate_limited(sock_net(sk), skb,
+                                                 LINUX_MIB_TCPACKSKIPPEDSEQ,
+                                                 &tp->last_oow_ack_time))
+                               tcp_send_dupack(sk, skb);
                }
                goto discard;
        }
@@ -5026,7 +5041,7 @@ static bool tcp_validate_incoming(struct sock *sk, struct sk_buff *skb,
                if (TCP_SKB_CB(skb)->seq == tp->rcv_nxt)
                        tcp_reset(sk);
                else
-                       tcp_send_challenge_ack(sk);
+                       tcp_send_challenge_ack(sk, skb);
                goto discard;
        }
 
@@ -5040,7 +5055,7 @@ syn_challenge:
                if (syn_inerr)
                        TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
                NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPSYNCHALLENGE);
-               tcp_send_challenge_ack(sk);
+               tcp_send_challenge_ack(sk, skb);
                goto discard;
        }
 

diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 131aa4950d1c2377bb738b35968758251c36ce29..98a840561ec8638498703533b2662cdfb9134a5e 100644 (file)
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -467,6 +467,7 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
                tcp_enable_early_retrans(newtp);
                newtp->tlp_high_seq = 0;
                newtp->lsndtime = treq->snt_synack;
+               newtp->last_oow_ack_time = 0;
                newtp->total_retrans = req->num_retrans;
 
                /* So many TCP implementations out there (incorrectly) count the