X-Git-Url: https://git.rohieb.name/openwrt.git/blobdiff_plain/b0c94d7f56f87751f1a594bc189b204eed800610..03c1e266f1773bf19ec443a5c563ddfb0d13e49c:/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
index 93794916c..7eda8c1e3 100644
--- a/package/busybox/patches/241-udhcpc-oversized_packets.patch
+++ b/package/busybox/patches/241-udhcpc-oversized_packets.patch
@@ -1,89 +1,75 @@
-Index: busybox-1.7.2/networking/udhcp/packet.c
-===================================================================
---- busybox-1.7.2.orig/networking/udhcp/packet.c	2007-10-30 15:35:00.000000000 -0500
-+++ busybox-1.7.2/networking/udhcp/packet.c	2007-10-30 15:35:01.000000000 -0500
-@@ -121,6 +121,10 @@
+--- a/networking/udhcp/packet.c
++++ b/networking/udhcp/packet.c
+@@ -114,6 +114,10 @@ uint16_t udhcp_checksum(void *addr, int 
  	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]);
++	return sizeof(struct dhcpMessage) - DHCP_OPTIONS_BUFSIZE + end_option(payload->options) + sizeof(payload->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);
-@@ -132,6 +136,7 @@
- 	int result;
- 	struct sockaddr_ll dest;
- 	struct udp_dhcp_packet packet;
+ /* Construct a ip/udp header for a packet, send packet */
+ int udhcp_send_raw_packet(struct dhcpMessage *payload,
+@@ -125,11 +129,7 @@ int udhcp_send_raw_packet(struct dhcpMes
+ 	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) {
-@@ -141,6 +146,7 @@
+@@ -139,7 +139,7 @@ int udhcp_send_raw_packet(struct dhcpMes
  
  	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);
-@@ -158,12 +164,13 @@
+@@ -156,23 +156,18 @@ int udhcp_send_raw_packet(struct dhcpMes
  	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 */
+-	/* 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;
--	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_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(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;
-@@ -172,7 +179,7 @@
- 	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,
+-	/* 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));
- 	if (result <= 0) {
- 		bb_perror_msg("sendto");
-@@ -216,7 +223,7 @@
- 		return -1;
+ 				(struct sockaddr *) &dest, sizeof(dest));
+ 	msg = "sendto";
+  ret_close:
+@@ -224,8 +219,7 @@ int udhcp_send_kernel_packet(struct dhcp
+ 		goto ret_close;
  	}
  
--	result = write(fd, payload, sizeof(struct dhcpMessage));
-+	result = write(fd, payload, udhcp_get_payload_len(payload));
+-	/* 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);
- 	return result;
- }
-Index: busybox-1.7.2/networking/udhcp/common.h
-===================================================================
---- busybox-1.7.2.orig/networking/udhcp/common.h	2007-10-30 15:35:00.000000000 -0500
-+++ busybox-1.7.2/networking/udhcp/common.h	2007-10-30 15:35:01.000000000 -0500
-@@ -21,6 +21,8 @@
- #include <netinet/udp.h>
- #include <netinet/ip.h>
- 
-+#define MAX_OPTIONS_LEN  308
-+
- struct dhcpMessage {
- 	uint8_t op;
- 	uint8_t htype;
-@@ -37,7 +39,7 @@
- 	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 {