From 024044a8f5e703f1d4a19e6c9b3c1cf3cad9b3d5 Mon Sep 17 00:00:00 2001
From: Nicolas Thill <nico@openwrt.org>
Date: Sun, 19 Nov 2006 01:44:16 +0000
Subject: [PATCH] fix oversized packets in udhcpc (closes: #962), bump busybox
 release number in whiterussian

SVN-Revision: 5583
---
 .../241-udhcpc-oversized_packets.patch        | 85 +++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 package/busybox/patches/241-udhcpc-oversized_packets.patch

diff --git a/package/busybox/patches/241-udhcpc-oversized_packets.patch b/package/busybox/patches/241-udhcpc-oversized_packets.patch
new file mode 100644
index 0000000000..d041bf5c3f
--- /dev/null
+++ b/package/busybox/patches/241-udhcpc-oversized_packets.patch
@@ -0,0 +1,85 @@
+diff -ruN busybox-1.2.1-old/networking/udhcp/packet.c busybox-1.2.1-new/networking/udhcp/packet.c
+--- busybox-1.2.1-old/networking/udhcp/packet.c	2006-07-01 00:42:02.000000000 +0200
++++ busybox-1.2.1-new/networking/udhcp/packet.c	2006-11-19 01:04:40.000000000 +0100
+@@ -111,6 +111,10 @@
+ 	return ~sum;
+ }
+ 
++int udhcp_get_payload_len(struct dhcpMessage *payload)
++{
++	return sizeof(struct dhcpMessage) - MAX_OPTIONS_LEN + end_option(payload->options) + sizeof(payload->options[0]);
++}
+ 
+ /* Construct a ip/udp header for a packet, and specify the source and dest hardware address */
+ int udhcp_raw_packet(struct dhcpMessage *payload, uint32_t source_ip, int source_port,
+@@ -120,6 +124,7 @@
+ 	int result;
+ 	struct sockaddr_ll dest;
+ 	struct udp_dhcp_packet packet;
++	int p_len = udhcp_get_payload_len(payload);
+ 
+ 	if ((fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
+ 		DEBUG(LOG_ERR, "socket call failed: %m");
+@@ -128,6 +133,7 @@
+ 
+ 	memset(&dest, 0, sizeof(dest));
+ 	memset(&packet, 0, sizeof(packet));
++	memcpy(&(packet.data), payload, p_len);
+ 
+ 	dest.sll_family = AF_PACKET;
+ 	dest.sll_protocol = htons(ETH_P_IP);
+@@ -145,18 +151,19 @@
+ 	packet.ip.daddr = dest_ip;
+ 	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 */
++	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));
++	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;
+ 	packet.ip.check = udhcp_checksum(&(packet.ip), sizeof(packet.ip));
+ 
+-	result = sendto(fd, &packet, sizeof(struct udp_dhcp_packet), 0, (struct sockaddr *) &dest, sizeof(dest));
++	result = sendto(fd, &packet, p_len, 0, (struct sockaddr *) &dest, sizeof(dest));
+ 	if (result <= 0) {
+ 		DEBUG(LOG_ERR, "write on socket failed: %m");
+ 	}
+@@ -201,7 +208,7 @@
+ 		return -1;
+ 	}
+ 
+-	result = write(fd, payload, sizeof(struct dhcpMessage));
++	result = write(fd, payload, udhcp_get_payload_len(payload));
+ 	close(fd);
+ 	return result;
+ }
+diff -ruN busybox-1.2.1-old/networking/udhcp/packet.h busybox-1.2.1-new/networking/udhcp/packet.h
+--- busybox-1.2.1-old/networking/udhcp/packet.h	2006-07-01 00:42:02.000000000 +0200
++++ busybox-1.2.1-new/networking/udhcp/packet.h	2006-11-19 00:49:38.000000000 +0100
+@@ -4,6 +4,8 @@
+ #include <netinet/udp.h>
+ #include <netinet/ip.h>
+ 
++#define MAX_OPTIONS_LEN  308
++
+ struct dhcpMessage {
+ 	uint8_t op;
+ 	uint8_t htype;
+@@ -20,7 +22,7 @@
+ 	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 {