tcp: call tcp_replace_ts_recent() from tcp_ack()

commit bd090dfc634d (tcp: tcp_replace_ts_recent() should not be called
from tcp_validate_incoming()) introduced a TS ecr bug in slow path
processing.

1 A > B P. 1:10001(10000) ack 1 <nop,nop,TS val 1001 ecr 200>
2 B < A . 1:1(0) ack 1 win 257 <sack 9001:10001,TS val 300 ecr 1001>
3 A > B . 1:1001(1000) ack 1 win 227 <nop,nop,TS val 1002 ecr 200>
4 A > B . 1001:2001(1000) ack 1 win 227 <nop,nop,TS val 1002 ecr 200>

(ecr 200 should be ecr 300 in packets 3 & 4)

Problem is tcp_ack() can trigger send of new packets (retransmits),
reflecting the prior TSval, instead of the TSval contained in the
currently processed incoming packet.

Fix this by calling tcp_replace_ts_recent() from tcp_ack() after the
checks, but before the actions.

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

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 3bd55bad230ac7f822f4ea75eb280bc8ce0c07fc..13b9c08fc1582531aa34eef92a432dc96f2a1c52 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -113,6 +113,7 @@ int sysctl_tcp_early_retrans __read_mostly = 2;
 #define FLAG_DSACKING_ACK      0x800 /* SACK blocks contained D-SACK info */
 #define FLAG_NONHEAD_RETRANS_ACKED     0x1000 /* Non-head rexmitted data was ACKed */
 #define FLAG_SACK_RENEGING     0x2000 /* snd_una advanced to a sacked seq */
+#define FLAG_UPDATE_TS_RECENT  0x4000 /* tcp_replace_ts_recent() */
 
 #define FLAG_ACKED             (FLAG_DATA_ACKED|FLAG_SYN_ACKED)
 #define FLAG_NOT_DUP           (FLAG_DATA|FLAG_WIN_UPDATE|FLAG_ACKED)
@@ -3564,6 +3565,27 @@ static void tcp_send_challenge_ack(struct sock *sk)
        }
 }
 
+static void tcp_store_ts_recent(struct tcp_sock *tp)
+{
+       tp->rx_opt.ts_recent = tp->rx_opt.rcv_tsval;
+       tp->rx_opt.ts_recent_stamp = get_seconds();
+}
+
+static void tcp_replace_ts_recent(struct tcp_sock *tp, u32 seq)
+{
+       if (tp->rx_opt.saw_tstamp && !after(seq, tp->rcv_wup)) {
+               /* PAWS bug workaround wrt. ACK frames, the PAWS discard
+                * extra check below makes sure this can only happen
+                * for pure ACK frames.  -DaveM
+                *
+                * Not only, also it occurs for expired timestamps.
+                */
+
+               if (tcp_paws_check(&tp->rx_opt, 0))
+                       tcp_store_ts_recent(tp);
+       }
+}
+
 /* This routine deals with incoming acks, but not outgoing ones. */
 static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
 {
@@ -3607,6 +3629,12 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
        prior_fackets = tp->fackets_out;
        prior_in_flight = tcp_packets_in_flight(tp);
 
+       /* ts_recent update must be made after we are sure that the packet
+        * is in window.
+        */
+       if (flag & FLAG_UPDATE_TS_RECENT)
+               tcp_replace_ts_recent(tp, TCP_SKB_CB(skb)->seq);
+
        if (!(flag & FLAG_SLOWPATH) && after(ack, prior_snd_una)) {
                /* Window is constant, pure forward advance.
                 * No more checks are required.
@@ -3927,27 +3955,6 @@ const u8 *tcp_parse_md5sig_option(const struct tcphdr *th)
 EXPORT_SYMBOL(tcp_parse_md5sig_option);
 #endif
 
-static inline void tcp_store_ts_recent(struct tcp_sock *tp)
-{
-       tp->rx_opt.ts_recent = tp->rx_opt.rcv_tsval;
-       tp->rx_opt.ts_recent_stamp = get_seconds();
-}
-
-static inline void tcp_replace_ts_recent(struct tcp_sock *tp, u32 seq)
-{
-       if (tp->rx_opt.saw_tstamp && !after(seq, tp->rcv_wup)) {
-               /* PAWS bug workaround wrt. ACK frames, the PAWS discard
-                * extra check below makes sure this can only happen
-                * for pure ACK frames.  -DaveM
-                *
-                * Not only, also it occurs for expired timestamps.
-                */
-
-               if (tcp_paws_check(&tp->rx_opt, 0))
-                       tcp_store_ts_recent(tp);
-       }
-}
-
 /* Sorry, PAWS as specified is broken wrt. pure-ACKs -DaveM
  *
  * It is not fatal. If this ACK does _not_ change critical state (seqs, window)
@@ -5543,14 +5550,9 @@ slow_path:
                return 0;
 
 step5:
-       if (tcp_ack(sk, skb, FLAG_SLOWPATH) < 0)
+       if (tcp_ack(sk, skb, FLAG_SLOWPATH | FLAG_UPDATE_TS_RECENT) < 0)
                goto discard;
 
-       /* ts_recent update must be made after we are sure that the packet
-        * is in window.
-        */
-       tcp_replace_ts_recent(tp, TCP_SKB_CB(skb)->seq);
-
        tcp_rcv_rtt_measure_ts(sk, skb);
 
        /* Process urgent data. */
@@ -5986,7 +5988,8 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
 
        /* step 5: check the ACK field */
        if (true) {
-               int acceptable = tcp_ack(sk, skb, FLAG_SLOWPATH) > 0;
+               int acceptable = tcp_ack(sk, skb, FLAG_SLOWPATH |
+                                                 FLAG_UPDATE_TS_RECENT) > 0;
 
                switch (sk->sk_state) {
                case TCP_SYN_RECV:
@@ -6137,11 +6140,6 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
                }
        }
 
-       /* ts_recent update must be made after we are sure that the packet
-        * is in window.
-        */
-       tcp_replace_ts_recent(tp, TCP_SKB_CB(skb)->seq);
-
        /* step 6: check the URG bit */
        tcp_urg(sk, skb, th);