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| author | Patrik Flykt <patrik.flykt@linux.intel.com> | 2016-02-25 15:36:40 +0200 |
|---|---|---|
| committer | Patrik Flykt <patrik.flykt@linux.intel.com> | 2016-02-25 15:46:55 +0200 |
| commit | 8eb7b6a595752b1ef1029717444bd4edccf878a8 (patch) | |
| tree | 9b7a3b8061b8a2cd9a52eab9b48c263b15ba77c3 /src/libsystemd-network | |
| parent | 96b08d65a12c304c59febbc52bc871753f0c6f31 (diff) | |
| download | systemd-8eb7b6a595752b1ef1029717444bd4edccf878a8.tar.gz | |
sd-dhcp-server: Send replies to BOOTP relay server port
RFC 2131 Section 4.1 says that
"If the ’giaddr’ field in a DHCP message from a client is non-zero,
the server sends any return messages to the ’DHCP server’ port on the
BOOTP relay agent whose address appears in ’giaddr’."
Fix this by adding a destination port when sending unicast UDP packets
and provide the server port when a BOOTP relay agent is being used.
Diffstat (limited to 'src/libsystemd-network')
| -rw-r--r-- | src/libsystemd-network/sd-dhcp-server.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/src/libsystemd-network/sd-dhcp-server.c b/src/libsystemd-network/sd-dhcp-server.c index 1c408aaaac..9adf8ec19d 100644 --- a/src/libsystemd-network/sd-dhcp-server.c +++ b/src/libsystemd-network/sd-dhcp-server.c @@ -280,10 +280,11 @@ static int dhcp_server_send_unicast_raw(sd_dhcp_server *server, } static int dhcp_server_send_udp(sd_dhcp_server *server, be32_t destination, + uint16_t destination_port, DHCPMessage *message, size_t len) { union sockaddr_union dest = { .in.sin_family = AF_INET, - .in.sin_port = htobe16(DHCP_PORT_CLIENT), + .in.sin_port = htobe16(destination_port), .in.sin_addr.s_addr = destination, }; struct iovec iov = { @@ -342,6 +343,7 @@ int dhcp_server_send_packet(sd_dhcp_server *server, DHCPRequest *req, DHCPPacket *packet, int type, size_t optoffset) { be32_t destination = INADDR_ANY; + uint16_t destination_port = DHCP_PORT_CLIENT; int r; assert(server); @@ -386,17 +388,19 @@ int dhcp_server_send_packet(sd_dhcp_server *server, */ if (req->message->giaddr) { destination = req->message->giaddr; + destination_port = DHCP_PORT_SERVER; if (type == DHCP_NAK) packet->dhcp.flags = htobe16(0x8000); } else if (req->message->ciaddr && type != DHCP_NAK) destination = req->message->ciaddr; if (destination != INADDR_ANY) - return dhcp_server_send_udp(server, destination, &packet->dhcp, + return dhcp_server_send_udp(server, destination, + destination_port, &packet->dhcp, sizeof(DHCPMessage) + optoffset); else if (requested_broadcast(req) || type == DHCP_NAK) return dhcp_server_send_udp(server, INADDR_BROADCAST, - &packet->dhcp, + destination_port, &packet->dhcp, sizeof(DHCPMessage) + optoffset); else /* we cannot send UDP packet to specific MAC address when the @@ -579,7 +583,8 @@ static int server_send_forcerenew(sd_dhcp_server *server, be32_t address, memcpy(&packet->dhcp.chaddr, chaddr, ETH_ALEN); - r = dhcp_server_send_udp(server, address, &packet->dhcp, + r = dhcp_server_send_udp(server, address, DHCP_PORT_CLIENT, + &packet->dhcp, sizeof(DHCPMessage) + optoffset); if (r < 0) return r; |