From d6cf996151307d083c30e4ecde0f1d7449b19253 Mon Sep 17 00:00:00 2001 From: "Ondrej Zajicek (work)" Date: Tue, 23 Jan 2018 17:05:45 +0100 Subject: [PATCH] IO: Fix socket priority On Linux, setting the ToS will also set the priority and the range of accepted values is quite limited (masked by 0x1e). Therefore, 0xc0 is translated to a priority of 0, not something we want, overriding the "7" priority which was set previously explicitely. To avoid that, just move setting priority later in the code. Thanks to Vincent Bernat for the patch. --- sysdep/unix/io.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/sysdep/unix/io.c b/sysdep/unix/io.c index 6d6a0990..53a37a50 100644 --- a/sysdep/unix/io.c +++ b/sysdep/unix/io.c @@ -1238,10 +1238,6 @@ sk_setup(sock *s) #endif } - if (s->priority >= 0) - if (sk_set_priority(s, s->priority) < 0) - return -1; - if (sk_is_ipv4(s)) { if (s->flags & SKF_LADDR_RX) @@ -1292,6 +1288,11 @@ sk_setup(sock *s) return -1; } + /* Must be after sk_set_tos4() as setting ToS on Linux also mangles priority */ + if (s->priority >= 0) + if (sk_set_priority(s, s->priority) < 0) + return -1; + return 0; }