details: http://hg.nginx.org/nginx/rev/e778fe9a4463
branches:
changeset: 6596:e778fe9a4463
user: Roman Arutyunyan <arut@nginx.com>
date: Mon Jun 20 12:48:47 2016 +0300
description:
Stream: set SO_REUSEADDR for UDP upstream sockets.

The option is only set if the socket is bound to a specific port to allow
several such sockets coexist at the same time. This is required, for example,
when nginx acts as a transparent proxy and receives two datagrams from the same
client in a short time.

The feature is only implemented for Linux.

diffstat:

src/event/ngx_event_connect.c | 26 +++++++++++++++++++++++++-
1 files changed, 25 insertions(+), 1 deletions(-)

diffs (52 lines):

diff -r 0c98c4092440 -r e778fe9a4463 src/event/ngx_event_connect.c
--- a/src/event/ngx_event_connect.c Mon Jun 20 11:50:44 2016 +0300
+++ b/src/event/ngx_event_connect.c Mon Jun 20 12:48:47 2016 +0300
@@ -21,6 +21,9 @@ ngx_int_t
ngx_event_connect_peer(ngx_peer_connection_t *pc)
{
int rc, type;
+#if (NGX_HAVE_IP_BIND_ADDRESS_NO_PORT || NGX_LINUX)
+ in_port_t port;
+#endif
ngx_int_t event;
ngx_err_t err;
ngx_uint_t level;
@@ -87,9 +90,13 @@ ngx_event_connect_peer(ngx_peer_connecti
}
#endif

+#if (NGX_HAVE_IP_BIND_ADDRESS_NO_PORT || NGX_LINUX)
+ port = ngx_inet_get_port(pc->sockaddr);
+#endif
+
#if (NGX_HAVE_IP_BIND_ADDRESS_NO_PORT)

- if (pc->sockaddr->sa_family != AF_UNIX) {
+ if (pc->sockaddr->sa_family != AF_UNIX && port == 0) {
static int bind_address_no_port = 1;

if (bind_address_no_port) {
@@ -113,6 +120,23 @@ ngx_event_connect_peer(ngx_peer_connecti

#endif

+#if (NGX_LINUX)
+
+ if (pc->type == SOCK_DGRAM && port != 0) {
+ int reuse_addr = 1;
+
+ if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
+ (const void *) &reuse_addr, sizeof(int))
+ == -1)
+ {
+ ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
+ "setsockopt(SO_REUSEADDR) failed");
+ goto failed;
+ }
+ }
+
+#endif
+
if (bind(s, pc->local->sockaddr, pc->local->socklen) == -1) {
ngx_log_error(NGX_LOG_CRIT, pc->log, ngx_socket_errno,
"bind(%V) failed", &pc->local->name);

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