-diff -ruN busybox-1.3.1-old/networking/udhcp/packet.c busybox-1.3.1/networking/udhcp/packet.c
---- busybox-1.3.1-old/networking/udhcp/packet.c 2006-12-27 05:52:33.000000000 +0100
-+++ busybox-1.3.1/networking/udhcp/packet.c 2006-12-28 05:38:36.000000000 +0100
-@@ -107,6 +107,10 @@
+--- a/networking/udhcp/packet.c
++++ b/networking/udhcp/packet.c
+@@ -165,6 +165,11 @@ uint16_t FAST_FUNC udhcp_checksum(void *
return ~sum;
}
-+int udhcp_get_payload_len(struct dhcpMessage *payload)
++int udhcp_get_payload_len(struct dhcp_packet *dhcp_pkt)
+{
-+ return sizeof(struct dhcpMessage) - MAX_OPTIONS_LEN + end_option(payload->options) + sizeof(payload->options[0]);
++ return sizeof(struct dhcp_packet) - DHCP_OPTIONS_BUFSIZE + udhcp_end_option(dhcp_pkt->options) + sizeof(dhcp_pkt->options[0]);
+}
-
- /* Construct a ip/udp header for a packet, and specify the source and dest hardware address */
- void BUG_sizeof_struct_udp_dhcp_packet_must_be_576(void);
-@@ -118,6 +122,7 @@
- int result;
- struct sockaddr_ll dest;
- struct udp_dhcp_packet packet;
-+ int p_len = udhcp_get_payload_len(payload);
++
+ /* Construct a ip/udp header for a packet, send packet */
+ int FAST_FUNC udhcp_send_raw_packet(struct dhcp_packet *dhcp_pkt,
+ uint32_t source_nip, int source_port,
+@@ -173,10 +178,10 @@ int FAST_FUNC udhcp_send_raw_packet(stru
+ {
+ struct sockaddr_ll dest_sll;
+ struct ip_udp_dhcp_packet packet;
+- unsigned padding;
+ int fd;
+ int result = -1;
+ const char *msg;
++ int p_len = udhcp_get_payload_len(dhcp_pkt);
fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
if (fd < 0) {
-@@ -127,6 +132,7 @@
+@@ -185,8 +190,8 @@ int FAST_FUNC udhcp_send_raw_packet(stru
+ }
- memset(&dest, 0, sizeof(dest));
- memset(&packet, 0, sizeof(packet));
-+ memcpy(&(packet.data), payload, p_len);
+ memset(&dest_sll, 0, sizeof(dest_sll));
+- memset(&packet, 0, offsetof(struct ip_udp_dhcp_packet, data));
+- packet.data = *dhcp_pkt; /* struct copy */
++ memset(&packet, 0, sizeof(packet));
++ memcpy(&(packet.data), dhcp_pkt, p_len);
+
+ dest_sll.sll_family = AF_PACKET;
+ dest_sll.sll_protocol = htons(ETH_P_IP);
+@@ -199,36 +204,24 @@ int FAST_FUNC udhcp_send_raw_packet(stru
+ goto ret_close;
+ }
- dest.sll_family = AF_PACKET;
- dest.sll_protocol = htons(ETH_P_IP);
-@@ -144,12 +150,13 @@
- packet.ip.daddr = dest_ip;
+- /* We were sending full-sized DHCP packets (zero padded),
+- * but some badly configured servers were seen dropping them.
+- * Apparently they drop all DHCP packets >576 *ethernet* octets big,
+- * whereas they may only drop packets >576 *IP* octets big
+- * (which for typical Ethernet II means 590 octets: 6+6+2 + 576).
+- *
+- * In order to work with those buggy servers,
+- * we truncate packets after end option byte.
+- */
+- padding = DHCP_OPTIONS_BUFSIZE - 1 - udhcp_end_option(packet.data.options);
+-
+ packet.ip.protocol = IPPROTO_UDP;
+ packet.ip.saddr = source_nip;
+ packet.ip.daddr = dest_nip;
packet.udp.source = htons(source_port);
packet.udp.dest = htons(dest_port);
-- packet.udp.len = htons(sizeof(packet.udp) + sizeof(struct dhcpMessage)); /* cheat on the psuedo-header */
+- /* size, excluding IP header: */
+- packet.udp.len = htons(UDP_DHCP_SIZE - padding);
+- /* 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;
-- memcpy(&(packet.data), payload, sizeof(struct dhcpMessage));
-- packet.udp.check = udhcp_checksum(&packet, sizeof(struct udp_dhcp_packet));
+- packet.udp.check = udhcp_checksum(&packet, IP_UDP_DHCP_SIZE - padding);
+- /* but for sending, it is set to IP packet len */
+- packet.ip.tot_len = htons(IP_UDP_DHCP_SIZE - padding);
+ p_len += sizeof(packet.ip);
+ packet.udp.check = udhcp_checksum(&packet, p_len);
-
-- packet.ip.tot_len = htons(sizeof(struct udp_dhcp_packet));
+ packet.ip.tot_len = htons(p_len);
packet.ip.ihl = sizeof(packet.ip) >> 2;
packet.ip.version = IPVERSION;
packet.ip.ttl = IPDEFTTL;
-@@ -158,7 +165,7 @@
- if (sizeof(struct udp_dhcp_packet) != 576)
- BUG_sizeof_struct_udp_dhcp_packet_must_be_576();
+ packet.ip.check = udhcp_checksum(&packet.ip, sizeof(packet.ip));
-- result = sendto(fd, &packet, sizeof(struct udp_dhcp_packet), 0,
-+ result = sendto(fd, &packet, p_len, 0,
- (struct sockaddr *) &dest, sizeof(dest));
- if (result <= 0) {
- bb_perror_msg("sendto");
-@@ -205,7 +212,7 @@
- return -1;
+ udhcp_dump_packet(dhcp_pkt);
+- result = sendto(fd, &packet, IP_UDP_DHCP_SIZE - padding, /*flags:*/ 0,
++ result = sendto(fd, &packet, p_len, /*flags:*/ 0,
+ (struct sockaddr *) &dest_sll, sizeof(dest_sll));
+ msg = "sendto";
+ ret_close:
+@@ -246,7 +239,6 @@ int FAST_FUNC udhcp_send_kernel_packet(s
+ uint32_t dest_nip, int dest_port)
+ {
+ struct sockaddr_in client;
+- unsigned padding;
+ int fd;
+ int result = -1;
+ const char *msg;
+@@ -277,9 +269,7 @@ int FAST_FUNC udhcp_send_kernel_packet(s
}
-- result = write(fd, payload, sizeof(struct dhcpMessage));
-+ result = write(fd, payload, udhcp_get_payload_len(payload));
+ udhcp_dump_packet(dhcp_pkt);
+-
+- padding = DHCP_OPTIONS_BUFSIZE - 1 - udhcp_end_option(dhcp_pkt->options);
+- result = safe_write(fd, dhcp_pkt, DHCP_SIZE - padding);
++ result = safe_write(fd, dhcp_pkt, udhcp_get_payload_len(dhcp_pkt));
+ msg = "write";
+ ret_close:
close(fd);
- return result;
- }
-diff -ruN busybox-1.3.1-old/networking/udhcp/common.h busybox-1.3.1/networking/udhcp/common.h
---- busybox-1.3.1-old/networking/udhcp/common.h 2006-12-27 05:52:33.000000000 +0100
-+++ busybox-1.3.1/networking/udhcp/common.h 2006-12-28 05:17:06.000000000 +0100
-@@ -26,6 +26,8 @@
- #include <netinet/udp.h>
- #include <netinet/ip.h>
-
-+#define MAX_OPTIONS_LEN 308
-+
- struct dhcpMessage {
- uint8_t op;
- uint8_t htype;
-@@ -42,7 +44,7 @@
- uint8_t sname[64];
- uint8_t file[128];
- uint32_t cookie;
-- uint8_t options[308]; /* 312 - cookie */
-+ uint8_t options[MAX_OPTIONS_LEN]; /* 312 - cookie */
- };
-
- struct udp_dhcp_packet {
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