lkml.org 
[lkml]   [2018]   [Jul]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH net,v2] tcp: Fix broken repair socket window probe patch
Date
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: 70b7ff130224 ("tcp: allow user to create repair socket without window probes")
Signed-off-by: Stefan Baranoff <sbaranoff@gmail.com>
---
include/uapi/linux/tcp.h | 4 ++++
net/ipv4/tcp.c | 13 +++++++------
2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index 29eb659..e3f6ed8 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -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;
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 8e5e2ca..ec2186e 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -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;
+ tcp_send_window_probe(sk);
+ } else if (val == TCP_REPAIR_OFF_NO_WP) {
tp->repair = 0;
sk->sk_reuse = SK_NO_REUSE;
- if (tp->repair == 1)
- tcp_send_window_probe(sk);
} else
err = -EINVAL;

--
1.8.3.1
\
 
 \ /
  Last update: 2018-07-15 22:07    [W:0.053 / U:2.384 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site