release/src/router/busybox/networking/udhcp/d6_socket.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Copyright (C) 2011 Denys Vlasenko.
   4  *
   5  * Licensed under GPLv2, see file LICENSE in this source tree.
   6  */
   7 #include "common.h"
   8 #include "d6_common.h"
   9 #include <net/if.h>
  10
  11 int FAST_FUNC d6_listen_socket(int port, const char *inf)
  12 {
  13         int fd;
  14         struct sockaddr_in6 addr;
  15
  16         log1("Opening listen socket on *:%d %s", port, inf);
  17         fd = xsocket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
  18
  19         setsockopt_reuseaddr(fd);
  20         if (setsockopt_broadcast(fd) == -1)
  21                 bb_perror_msg_and_die("SO_BROADCAST");
  22
  23         /* NB: bug 1032 says this doesn't work on ethernet aliases (ethN:M) */
  24         if (setsockopt_bindtodevice(fd, inf))
  25                 xfunc_die(); /* warning is already printed */
  26
  27         memset(&addr, 0, sizeof(addr));
  28         addr.sin6_family = AF_INET6;
  29         addr.sin6_port = htons(port);
  30         /* addr.sin6_addr is all-zeros */
  31         xbind(fd, (struct sockaddr *)&addr, sizeof(addr));
  32
  33         return fd;
  34 }