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socket: Set SO_REUSEPORT before bind()

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bind() fails if it is called before setting SO_REUSEPORT and another
process is already binded to the same addess.

A new reuse_port option has been introduced to socket_address_listen()
to set the option as part of socket initialization.
This commit is contained in:
Christos Trochalakis 2015-07-01 14:39:53 +03:00
parent 52a321d839
commit 54255c64e6
3 changed files with 10 additions and 7 deletions
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9
src/basic/socket-label.c
View File

@ -38,6 +38,7 @@ int socket_address_listen(
int backlog,
SocketAddressBindIPv6Only only,
const char *bind_to_device,
bool reuse_port,
bool free_bind,
bool transparent,
mode_t directory_mode,
@ -83,6 +84,12 @@ int socket_address_listen(
if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, bind_to_device, strlen(bind_to_device)+1) < 0)
return -errno;
if (reuse_port) {
one = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &one, sizeof(one)) < 0)
log_warning_errno(errno, "SO_REUSEPORT failed: %m");
}
if (free_bind) {
one = 1;
if (setsockopt(fd, IPPROTO_IP, IP_FREEBIND, &one, sizeof(one)) < 0)
@ -146,7 +153,7 @@ int make_socket_fd(int log_level, const char* address, int flags) {
}
fd = socket_address_listen(&a, flags, SOMAXCONN, SOCKET_ADDRESS_DEFAULT,
NULL, false, false, 0755, 0644, NULL);
NULL, false, false, false, 0755, 0644, NULL);
if (fd < 0 || log_get_max_level() >= log_level) {
_cleanup_free_ char *p = NULL;

1
src/basic/socket-util.h
View File

@ -80,6 +80,7 @@ int socket_address_listen(
int backlog,
SocketAddressBindIPv6Only only,
const char *bind_to_device,
bool reuse_port,
bool free_bind,
bool transparent,
mode_t directory_mode,

7
src/core/socket.c
View File

@ -922,12 +922,6 @@ static void socket_apply_socket_options(Socket *s, int fd) {
if (setsockopt(fd, SOL_TCP, TCP_CONGESTION, s->tcp_congestion, strlen(s->tcp_congestion)+1) < 0)
log_unit_warning_errno(UNIT(s), errno, "TCP_CONGESTION failed: %m");
if (s->reuse_port) {
int b = s->reuse_port;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &b, sizeof(b)) < 0)
log_unit_warning_errno(UNIT(s), errno, "SO_REUSEPORT failed: %m");
}
if (s->smack_ip_in) {
r = mac_smack_apply_ip_in_fd(fd, s->smack_ip_in);
if (r < 0)
@ -1183,6 +1177,7 @@ static int socket_open_fds(Socket *s) {
s->backlog,
s->bind_ipv6_only,
s->bind_to_device,
s->reuse_port,
s->free_bind,
s->transparent,
s->directory_mode,