From 31ecd29b3b3f51145fd78f63087c10e9fcadf999 Mon Sep 17 00:00:00 2001
From: Steve Dickson <steved@redhat.com>
Date: Tue, 22 May 2018 12:41:59 +0200
Subject: [PATCH] Listen on a TCP socket
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rpc.rquotad spins in libtirpc's rendezvous_request() on accepting TCP
connections because the polled TCP socket is not listening:
poll([{fd=4, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}, {fd=5,
events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}, {fd=6,
events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}, {fd=7,
events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 4, -1) = 2 ([{fd=5,
revents=POLLHUP}, {fd=7, revents=POLLHUP}])
accept(5, 0x7ffe61698700, [128]) = -1 EINVAL (Invalid argument)
accept(7, 0x7ffe61698700, [128]) = -1 EINVAL (Invalid argument)
The polled descriptors are:
rpc.rquot 21981 root 4u IPv4 80449159 0t0 UDP *:rquotad
rpc.rquot 21981 root 5u sock 0,9 0t0 80449162 protocol: TCP
rpc.rquot 21981 root 6u IPv6 80449165 0t0 UDP *:rquotad
rpc.rquot 21981 root 7u sock 0,9 0t0 80449168 protocol: TCPv6
That results into a high CPU usage just after staring rpc.rquotad
process.
This patch adds a listen() call to svc_create_sock()
routine which is needed with libtirpc version of svc_tli_create()
as well as a needed IPv6 setsockopt().
Signed-off-by: Petr Písař <ppisar@redhat.com>
---
svc_socket.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/svc_socket.c b/svc_socket.c
index 8a44604..d2e3abf 100644
--- a/svc_socket.c
+++ b/svc_socket.c
@@ -118,6 +118,15 @@ static int svc_create_sock(struct addrinfo *ai)
return -1;
}
+ if (ai->ai_family == AF_INET6) {
+ if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY,
+ &optval, sizeof(optval)) < 0) {
+ errstr(_("Cannot set IPv6 socket options: %s\n"), strerror(errno));
+ close(fd);
+ return -1;
+ }
+ }
+
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)) < 0) {
errstr(_("Cannot set socket options: %s\n"), strerror(errno));
close(fd);
@@ -129,6 +138,15 @@ static int svc_create_sock(struct addrinfo *ai)
close(fd);
return -1;
}
+
+ if (ai->ai_protocol == IPPROTO_TCP) {
+ if (listen(fd, SOMAXCONN) < 0) {
+ errstr(_("Cannot listen to address: %s\n"), strerror(errno));
+ close(fd);
+ return -1;
+ }
+ }
+
return fd;
}
--
2.14.3