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Commit 31048d7a authored by Stefan Baranoff's avatar Stefan Baranoff Committed by David S. Miller
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tcp: Fix broken repair socket window probe patch 



Correct previous bad attempt at allowing sockets to come out of TCP
repair without sending window probes. To avoid changing size of
the repair variable in struct tcp_sock, this lets the decision for
sending probes or not to be made when coming out of repair by
introducing two ways to turn it off.

v2:
* Remove erroneous comment; defines now make behavior clear

Fixes: 70b7ff13 ("tcp: allow user to create repair socket without window probes")
Signed-off-by: default avatarStefan Baranoff <sbaranoff@gmail.com>
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Acked-by: default avatarAndrei Vagin <avagin@virtuozzo.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 432e629e

include/uapi/linux/tcp.h

+4 −0
Original line number Diff line number Diff line
@@ -127,6 +127,10 @@ enum { 


#define TCP_CM_INQ		TCP_INQ



#define TCP_REPAIR_ON		1

#define TCP_REPAIR_OFF		0

#define TCP_REPAIR_OFF_NO_WP	-1	/* Turn off without window probes */



struct tcp_repair_opt {

	__u32	opt_code;

	__u32	opt_val;

net/ipv4/tcp.c

+7 −6
Original line number Diff line number Diff line
@@ -2823,16 +2823,17 @@ static int do_tcp_setsockopt(struct sock *sk, int level, 
	case TCP_REPAIR:

		if (!tcp_can_repair_sock(sk))

			err = -EPERM;

		/* 1 for normal repair, 2 for no window probes */

		else if (val == 1 || val == 2) {

			tp->repair = val;

		else if (val == TCP_REPAIR_ON) {

			tp->repair = 1;

			sk->sk_reuse = SK_FORCE_REUSE;

			tp->repair_queue = TCP_NO_QUEUE;

		} else if (val == 0) {

		} else if (val == TCP_REPAIR_OFF) {

			tp->repair = 0;

			sk->sk_reuse = SK_NO_REUSE;

			if (tp->repair == 1)

			tcp_send_window_probe(sk);

		} else if (val == TCP_REPAIR_OFF_NO_WP) {

			tp->repair = 0;

			sk->sk_reuse = SK_NO_REUSE;

		} else

			err = -EINVAL;