X-Git-Url: https://git.rohieb.name/openwrt.git/blobdiff_plain/b0c94d7f56f87751f1a594bc189b204eed800610..06b02b27ce12efec40aecea81d090148a42739f3:/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..471d704a7 100644 --- a/package/busybox/patches/241-udhcpc-oversized_packets.patch +++ b/package/busybox/patches/241-udhcpc-oversized_packets.patch @@ -1,89 +1,99 @@ -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 +@@ -158,6 +158,11 @@ 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); -@@ -132,6 +136,7 @@ - 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, +@@ -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) { -@@ -141,6 +146,7 @@ +@@ -178,8 +183,8 @@ 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); +@@ -192,36 +197,24 @@ int FAST_FUNC udhcp_send_raw_packet(stru + goto ret_close; + } - dest.sll_family = AF_PACKET; - dest.sll_protocol = htons(ETH_P_IP); -@@ -158,12 +164,13 @@ - 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; -@@ -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, -+ 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; + 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 } -- 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; - } -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 - #include - -+#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 {