diff options
Diffstat (limited to 'package/busybox/patches/241-udhcpc-oversized_packets.patch')
| -rw-r--r-- | package/busybox/patches/241-udhcpc-oversized_packets.patch | 80 |
1 files changed, 40 insertions, 40 deletions
diff --git a/package/busybox/patches/241-udhcpc-oversized_packets.patch b/package/busybox/patches/241-udhcpc-oversized_packets.patch index 0ee4c54..b810752 100644 --- a/package/busybox/patches/241-udhcpc-oversized_packets.patch +++ b/package/busybox/patches/241-udhcpc-oversized_packets.patch @@ -1,52 +1,60 @@ --- a/networking/udhcp/packet.c +++ b/networking/udhcp/packet.c -@@ -164,6 +164,11 @@ uint16_t FAST_FUNC udhcp_checksum(void * +@@ -165,6 +165,11 @@ 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 + end_option(dhcp_pkt->options) + sizeof(dhcp_pkt->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, send packet */ int FAST_FUNC udhcp_send_raw_packet(struct dhcp_packet *dhcp_pkt, - uint32_t source_ip, int source_port, -@@ -175,11 +180,7 @@ int FAST_FUNC udhcp_send_raw_packet(stru + uint32_t source_nip, int source_port, +@@ -173,11 +178,12 @@ 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; -- -- enum { -- IP_UPD_DHCP_SIZE = sizeof(struct ip_udp_dhcp_packet) - CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS, -- UPD_DHCP_SIZE = IP_UPD_DHCP_SIZE - offsetof(struct ip_udp_dhcp_packet, udp), -- }; -+ int p_len = udhcp_get_payload_len(dhcp_pkt); ++ int p_len = udhcp_get_payload_len(dhcp_pkt); ++ fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP)); if (fd < 0) { -@@ -189,7 +190,7 @@ int FAST_FUNC udhcp_send_raw_packet(stru + msg = "socket(%s)"; +@@ -186,7 +192,7 @@ int FAST_FUNC udhcp_send_raw_packet(stru - memset(&dest, 0, sizeof(dest)); - memset(&packet, 0, sizeof(packet)); + memset(&dest_sll, 0, sizeof(dest_sll)); + memset(&packet, 0, offsetof(struct ip_udp_dhcp_packet, data)); - packet.data = *dhcp_pkt; /* struct copy */ + memcpy(&(packet.data), dhcp_pkt, p_len); - dest.sll_family = AF_PACKET; - dest.sll_protocol = htons(ETH_P_IP); -@@ -206,24 +207,19 @@ int FAST_FUNC udhcp_send_raw_packet(stru - packet.ip.daddr = dest_ip; + dest_sll.sll_family = AF_PACKET; + dest_sll.sll_protocol = htons(ETH_P_IP); +@@ -208,27 +214,25 @@ int FAST_FUNC udhcp_send_raw_packet(stru + * 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(UPD_DHCP_SIZE); +- packet.udp.len = htons(UPD_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_UPD_DHCP_SIZE); +- packet.udp.check = udhcp_checksum(&packet, IP_UPD_DHCP_SIZE - padding); - /* but for sending, it is set to IP packet len */ -- packet.ip.tot_len = htons(IP_UPD_DHCP_SIZE); +- packet.ip.tot_len = htons(IP_UPD_DHCP_SIZE - padding); + p_len += sizeof(packet.ip); + packet.udp.check = udhcp_checksum(&packet, p_len); + packet.ip.tot_len = htons(p_len); @@ -55,34 +63,26 @@ packet.ip.ttl = IPDEFTTL; packet.ip.check = udhcp_checksum(&packet.ip, sizeof(packet.ip)); -- /* 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)] -- */ udhcp_dump_packet(dhcp_pkt); -- result = sendto(fd, &packet, IP_UPD_DHCP_SIZE, 0, +- result = sendto(fd, &packet, IP_UPD_DHCP_SIZE - padding, /*flags:*/ 0, + result = sendto(fd, &packet, p_len, 0, - (struct sockaddr *) &dest, sizeof(dest)); + (struct sockaddr *) &dest_sll, sizeof(dest_sll)); msg = "sendto"; ret_close: -@@ -245,10 +241,6 @@ int FAST_FUNC udhcp_send_kernel_packet(s +@@ -246,7 +250,6 @@ 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; +@@ -278,8 +281,7 @@ int FAST_FUNC udhcp_send_kernel_packet(s -- enum { -- DHCP_SIZE = sizeof(struct dhcp_packet) - CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS, -- }; -- - fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP); - if (fd < 0) { - msg = "socket(%s)"; -@@ -274,9 +266,8 @@ int FAST_FUNC udhcp_send_kernel_packet(s - goto ret_close; - } - -- /* Currently we send full-sized DHCP packets (see above) */ udhcp_dump_packet(dhcp_pkt); -- result = safe_write(fd, dhcp_pkt, DHCP_SIZE); + +- 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: |