busybox: drop a udhcpc patch that has been superseded by upstream changes a long time ago

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 40849

package/utils/busybox/patches/241-udhcpc-oversized_packets.patch

@@ -1,99 +0,0 @@
---- a/networking/udhcp/packet.c
-+++ b/networking/udhcp/packet.c
-@@ -158,6 +158,11 @@ uint16_t FAST_FUNC udhcp_checksum(void *
- 	return ~sum;
- }
- 
-+int udhcp_get_payload_len(struct dhcp_packet *dhcp_pkt)
-+{
-+	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, send packet */
- int FAST_FUNC udhcp_send_raw_packet(struct dhcp_packet *dhcp_pkt,
- 		uint32_t source_nip, int source_port,
-@@ -166,10 +171,10 @@ 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) {
-@@ -178,8 +183,8 @@ int FAST_FUNC udhcp_send_raw_packet(stru
- 	}
- 
- 	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);
-@@ -192,36 +197,24 @@ int FAST_FUNC udhcp_send_raw_packet(stru
- 		goto ret_close;
- 	}
- 
--	/* 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);
--	/* 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;
--	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(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));
- 
- 	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:
-@@ -239,7 +232,6 @@ 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;
-@@ -270,9 +262,7 @@ int FAST_FUNC udhcp_send_kernel_packet(s
- 	}
- 
- 	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);