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

   1 diff -ruN busybox-1.3.1-old/networking/udhcp/packet.c busybox-1.3.1/networking/udhcp/packet.c
   2 --- busybox-1.3.1-old/networking/udhcp/packet.c 2006-12-27 05:52:33.000000000 +0100
   3 +++ busybox-1.3.1/networking/udhcp/packet.c     2006-12-28 05:38:36.000000000 +0100
   4 @@ -107,6 +107,10 @@
   5         return ~sum;
   6  }
   7
   8 +int udhcp_get_payload_len(struct dhcpMessage *payload)
   9 +{
  10 +       return sizeof(struct dhcpMessage) - MAX_OPTIONS_LEN + end_option(payload->options) + sizeof(payload->options[0]);
  11 +}
  12
  13  /* Construct a ip/udp header for a packet, and specify the source and dest hardware address */
  14  void BUG_sizeof_struct_udp_dhcp_packet_must_be_576(void);
  15 @@ -118,6 +122,7 @@
  16         int result;
  17         struct sockaddr_ll dest;
  18         struct udp_dhcp_packet packet;
  19 +       int p_len = udhcp_get_payload_len(payload);
  20
  21         fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
  22         if (fd < 0) {
  23 @@ -127,6 +132,7 @@
  24
  25         memset(&dest, 0, sizeof(dest));
  26         memset(&packet, 0, sizeof(packet));
  27 +       memcpy(&(packet.data), payload, p_len);
  28
  29         dest.sll_family = AF_PACKET;
  30         dest.sll_protocol = htons(ETH_P_IP);
  31 @@ -144,12 +150,13 @@
  32         packet.ip.daddr = dest_ip;
  33         packet.udp.source = htons(source_port);
  34         packet.udp.dest = htons(dest_port);
  35 -       packet.udp.len = htons(sizeof(packet.udp) + sizeof(struct dhcpMessage)); /* cheat on the psuedo-header */
  36 +       p_len += sizeof(packet.udp);
  37 +       packet.udp.len = htons(p_len);
  38         packet.ip.tot_len = packet.udp.len;
  39 -       memcpy(&(packet.data), payload, sizeof(struct dhcpMessage));
  40 -       packet.udp.check = udhcp_checksum(&packet, sizeof(struct udp_dhcp_packet));
  41 +       p_len += sizeof(packet.ip);
  42 +       packet.udp.check = udhcp_checksum(&packet, p_len);
  43
  44 -       packet.ip.tot_len = htons(sizeof(struct udp_dhcp_packet));
  45 +       packet.ip.tot_len = htons(p_len);
  46         packet.ip.ihl = sizeof(packet.ip) >> 2;
  47         packet.ip.version = IPVERSION;
  48         packet.ip.ttl = IPDEFTTL;
  49 @@ -158,7 +165,7 @@
  50         if (sizeof(struct udp_dhcp_packet) != 576)
  51                 BUG_sizeof_struct_udp_dhcp_packet_must_be_576();
  52
  53 -       result = sendto(fd, &packet, sizeof(struct udp_dhcp_packet), 0,
  54 +       result = sendto(fd, &packet, p_len, 0,
  55                         (struct sockaddr *) &dest, sizeof(dest));
  56         if (result <= 0) {
  57                 bb_perror_msg("sendto");
  58 @@ -205,7 +212,7 @@
  59                 return -1;
  60         }
  61
  62 -       result = write(fd, payload, sizeof(struct dhcpMessage));
  63 +       result = write(fd, payload, udhcp_get_payload_len(payload));
  64         close(fd);
  65         return result;
  66  }
  67 diff -ruN busybox-1.3.1-old/networking/udhcp/common.h busybox-1.3.1/networking/udhcp/common.h
  68 --- busybox-1.3.1-old/networking/udhcp/common.h 2006-12-27 05:52:33.000000000 +0100
  69 +++ busybox-1.3.1/networking/udhcp/common.h     2006-12-28 05:17:06.000000000 +0100
  70 @@ -26,6 +26,8 @@
  71  #include <netinet/udp.h>
  72  #include <netinet/ip.h>
  73
  74 +#define MAX_OPTIONS_LEN  308
  75 +
  76  struct dhcpMessage {
  77         uint8_t op;
  78         uint8_t htype;
  79 @@ -42,7 +44,7 @@
  80         uint8_t sname[64];
  81         uint8_t file[128];
  82         uint32_t cookie;
  83 -       uint8_t options[308]; /* 312 - cookie */
  84 +       uint8_t options[MAX_OPTIONS_LEN]; /* 312 - cookie */
  85  };
  86
  87  struct udp_dhcp_packet {