mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-18 12:16:17 +02:00
ac2d02c3e0
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@12348 3c298f89-4303-0410-b956-a3cf2f4a3e73
76 lines
2.4 KiB
Diff
76 lines
2.4 KiB
Diff
--- a/networking/udhcp/packet.c
|
|
+++ b/networking/udhcp/packet.c
|
|
@@ -114,6 +114,10 @@
|
|
return ~sum;
|
|
}
|
|
|
|
+int udhcp_get_payload_len(struct dhcpMessage *payload)
|
|
+{
|
|
+ return sizeof(struct dhcpMessage) - DHCP_OPTIONS_BUFSIZE + end_option(payload->options) + sizeof(payload->options[0]);
|
|
+}
|
|
|
|
/* Construct a ip/udp header for a packet, send packet */
|
|
int udhcp_send_raw_packet(struct dhcpMessage *payload,
|
|
@@ -125,11 +129,7 @@
|
|
int fd;
|
|
int result = -1;
|
|
const char *msg;
|
|
-
|
|
- enum {
|
|
- IP_UPD_DHCP_SIZE = sizeof(struct udp_dhcp_packet) - CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS,
|
|
- UPD_DHCP_SIZE = IP_UPD_DHCP_SIZE - offsetof(struct udp_dhcp_packet, udp),
|
|
- };
|
|
+ int p_len = udhcp_get_payload_len(payload);
|
|
|
|
fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
|
|
if (fd < 0) {
|
|
@@ -139,7 +139,7 @@
|
|
|
|
memset(&dest, 0, sizeof(dest));
|
|
memset(&packet, 0, sizeof(packet));
|
|
- packet.data = *payload; /* struct copy */
|
|
+ memcpy(&(packet.data), payload, p_len);
|
|
|
|
dest.sll_family = AF_PACKET;
|
|
dest.sll_protocol = htons(ETH_P_IP);
|
|
@@ -156,23 +156,18 @@
|
|
packet.ip.daddr = dest_ip;
|
|
packet.udp.source = htons(source_port);
|
|
packet.udp.dest = htons(dest_port);
|
|
- /* size, excluding IP header: */
|
|
- packet.udp.len = htons(UPD_DHCP_SIZE);
|
|
- /* for UDP checksumming, ip.len is set to UDP packet len */
|
|
+ p_len += sizeof(packet.udp);
|
|
+ packet.udp.len = htons(p_len);
|
|
packet.ip.tot_len = packet.udp.len;
|
|
- packet.udp.check = udhcp_checksum(&packet, IP_UPD_DHCP_SIZE);
|
|
- /* but for sending, it is set to IP packet len */
|
|
- packet.ip.tot_len = htons(IP_UPD_DHCP_SIZE);
|
|
+ p_len += sizeof(packet.ip);
|
|
+ packet.udp.check = udhcp_checksum(&packet, p_len);
|
|
+ packet.ip.tot_len = htons(p_len);
|
|
packet.ip.ihl = sizeof(packet.ip) >> 2;
|
|
packet.ip.version = IPVERSION;
|
|
packet.ip.ttl = IPDEFTTL;
|
|
packet.ip.check = udhcp_checksum(&packet.ip, sizeof(packet.ip));
|
|
|
|
- /* Currently we send full-sized DHCP packets (zero padded).
|
|
- * If you need to change this: last byte of the packet is
|
|
- * packet.data.options[end_option(packet.data.options)]
|
|
- */
|
|
- result = sendto(fd, &packet, IP_UPD_DHCP_SIZE, 0,
|
|
+ result = sendto(fd, &packet, p_len, 0,
|
|
(struct sockaddr *) &dest, sizeof(dest));
|
|
msg = "sendto";
|
|
ret_close:
|
|
@@ -224,8 +219,7 @@
|
|
goto ret_close;
|
|
}
|
|
|
|
- /* Currently we send full-sized DHCP packets (see above) */
|
|
- result = safe_write(fd, payload, DHCP_SIZE);
|
|
+ result = safe_write(fd, payload, udhcp_get_payload_len(payload));
|
|
msg = "write";
|
|
ret_close:
|
|
close(fd);
|