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authorTom Gundersen <teg@jklm.no>2014-07-25 14:43:16 +0200
committerTom Gundersen <teg@jklm.no>2014-07-28 10:44:51 +0200
commit076adf013a171e819f84684e2eb22e965e96ee59 (patch)
treeb9bea55088432a3764613b9a5afdd17d6c17f16f /src/libsystemd-network
parent2d2349cc3ed43153344807892332c9fa626c8d8a (diff)
dhcp-network: enable IP_FREEBIND for UDP sockets
This allows the sockets to be bound to a specific address before it is configured, also enable SO_REUSEADDR to allow multiple DHCP clients to run at the same time.
Diffstat (limited to 'src/libsystemd-network')
-rw-r--r--src/libsystemd-network/dhcp-network.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/src/libsystemd-network/dhcp-network.c b/src/libsystemd-network/dhcp-network.c
index 16411cc41a..29276c0559 100644
--- a/src/libsystemd-network/dhcp-network.c
+++ b/src/libsystemd-network/dhcp-network.c
@@ -126,7 +126,7 @@ int dhcp_network_bind_udp_socket(be32_t address, uint16_t port) {
.in.sin_addr.s_addr = address,
};
_cleanup_close_ int s = -1;
- int r, tos = IPTOS_CLASS_CS6;
+ int r, on = 1, tos = IPTOS_CLASS_CS6;
s = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
if (s < 0)
@@ -136,13 +136,11 @@ int dhcp_network_bind_udp_socket(be32_t address, uint16_t port) {
if (r < 0)
return -errno;
- if (address == INADDR_ANY) {
- int on = 1;
-
- r = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
- if (r < 0)
- return -errno;
+ r = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
+ if (r < 0)
+ return -errno;
+ if (address == INADDR_ANY) {
r = setsockopt(s, IPPROTO_IP, IP_PKTINFO, &on, sizeof(on));
if (r < 0)
return -errno;
@@ -150,6 +148,10 @@ int dhcp_network_bind_udp_socket(be32_t address, uint16_t port) {
r = setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on));
if (r < 0)
return -errno;
+ } else {
+ r = setsockopt(s, IPPROTO_IP, IP_FREEBIND, &on, sizeof(on));
+ if (r < 0)
+ return -errno;
}
r = bind(s, &src.sa, sizeof(src.in));