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authorTom Gundersen <teg@jklm.no>2014-03-09 22:51:07 +0100
committerTom Gundersen <teg@jklm.no>2014-03-11 12:03:46 +0100
commit63edaa623bee43c934a0c357e8c6498992429391 (patch)
treefd954cad50a6d4661e79fa0364c5af1995648970 /src/libsystemd-network
parenta7b1c3971a30546fe633e320d45033aba8b2ca3c (diff)
sd-dhcp: generalise ip header generation
This will be needed for sd-dhcp-server.
Diffstat (limited to 'src/libsystemd-network')
-rw-r--r--src/libsystemd-network/dhcp-internal.h4
-rw-r--r--src/libsystemd-network/dhcp-packet.c12
-rw-r--r--src/libsystemd-network/sd-dhcp-client.c27
3 files changed, 27 insertions, 16 deletions
diff --git a/src/libsystemd-network/dhcp-internal.h b/src/libsystemd-network/dhcp-internal.h
index ce83b81631..3c3e1f649f 100644
--- a/src/libsystemd-network/dhcp-internal.h
+++ b/src/libsystemd-network/dhcp-internal.h
@@ -48,7 +48,9 @@ int dhcp_option_parse(DHCPMessage *message, size_t len,
int dhcp_message_init(DHCPMessage *message, uint8_t op, uint32_t xid, uint8_t type,
uint8_t **opt, size_t *optlen);
-void dhcp_packet_append_ip_headers(DHCPPacket *packet, uint16_t len);
+void dhcp_packet_append_ip_headers(DHCPPacket *packet, be32_t source_addr,
+ uint16_t source, be32_t destination_addr,
+ uint16_t destination, uint16_t len);
int dhcp_packet_verify_headers(DHCPPacket *packet, size_t len, bool checksum);
diff --git a/src/libsystemd-network/dhcp-packet.c b/src/libsystemd-network/dhcp-packet.c
index 95c4277f8c..418a9773f2 100644
--- a/src/libsystemd-network/dhcp-packet.c
+++ b/src/libsystemd-network/dhcp-packet.c
@@ -92,17 +92,19 @@ static uint16_t dhcp_checksum(void *buf, int len) {
return ~sum;
}
-void dhcp_packet_append_ip_headers(DHCPPacket *packet, uint16_t len) {
+void dhcp_packet_append_ip_headers(DHCPPacket *packet, be32_t source_addr,
+ uint16_t source_port, be32_t destination_addr,
+ uint16_t destination_port, uint16_t len) {
packet->ip.version = IPVERSION;
packet->ip.ihl = DHCP_IP_SIZE / 4;
packet->ip.tot_len = htobe16(len);
packet->ip.protocol = IPPROTO_UDP;
- packet->ip.saddr = INADDR_ANY;
- packet->ip.daddr = INADDR_BROADCAST;
+ packet->ip.saddr = source_addr;
+ packet->ip.daddr = destination_addr;
- packet->udp.source = htobe16(DHCP_PORT_CLIENT);
- packet->udp.dest = htobe16(DHCP_PORT_SERVER);
+ packet->udp.source = htobe16(source_port);
+ packet->udp.dest = htobe16(destination_port);
packet->udp.len = htobe16(len - DHCP_IP_SIZE);
diff --git a/src/libsystemd-network/sd-dhcp-client.c b/src/libsystemd-network/sd-dhcp-client.c
index 07b27d5393..e0fce5b5ad 100644
--- a/src/libsystemd-network/sd-dhcp-client.c
+++ b/src/libsystemd-network/sd-dhcp-client.c
@@ -264,6 +264,15 @@ static int client_message_init(sd_dhcp_client *client, DHCPMessage *message,
return 0;
}
+static int dhcp_client_send_raw(sd_dhcp_client *client, DHCPPacket *packet,
+ size_t len) {
+ dhcp_packet_append_ip_headers(packet, INADDR_ANY, DHCP_PORT_CLIENT,
+ INADDR_BROADCAST, DHCP_PORT_SERVER, len);
+
+ return dhcp_network_send_raw_socket(client->fd, &client->link,
+ packet, len);
+}
+
static int client_send_discover(sd_dhcp_client *client, uint16_t secs) {
int err = 0;
_cleanup_free_ DHCPPacket *discover;
@@ -295,14 +304,13 @@ static int client_send_discover(sd_dhcp_client *client, uint16_t secs) {
if (err < 0)
return err;
- dhcp_packet_append_ip_headers(discover, len);
-
- err = dhcp_network_send_raw_socket(client->fd, &client->link,
- discover, len);
+ err = dhcp_client_send_raw(client, discover, len);
+ if (err < 0)
+ return err;
log_dhcp_client(client, "DISCOVER");
- return err;
+ return 0;
}
static int client_send_request(sd_dhcp_client *client, uint16_t secs) {
@@ -348,15 +356,14 @@ static int client_send_request(sd_dhcp_client *client, uint16_t secs) {
&request->dhcp,
len - DHCP_IP_UDP_SIZE);
} else {
- dhcp_packet_append_ip_headers(request, len);
-
- err = dhcp_network_send_raw_socket(client->fd, &client->link,
- request, len);
+ err = dhcp_client_send_raw(client, request, len);
}
+ if (err < 0)
+ return err;
log_dhcp_client(client, "REQUEST");
- return err;
+ return 0;
}
static uint16_t client_update_secs(sd_dhcp_client *client, usec_t time_now)