ntp-4.2.6p1-bcast.patch

   1 diff -up ntp-4.2.6p1/ntpd/ntp_io.c.bcast ntp-4.2.6p1/ntpd/ntp_io.c
   2 --- ntp-4.2.6p1/ntpd/ntp_io.c.bcast     2009-12-09 08:36:37.000000000 +0100
   3 +++ ntp-4.2.6p1/ntpd/ntp_io.c   2010-03-05 14:49:25.000000000 +0100
   4 @@ -151,6 +151,8 @@ int ninterfaces;                    /* Total number of in
   5
   6  int disable_dynamic_updates;           /* scan interfaces once only */
   7
   8 +static int pktinfo_status = 0;         /* is IP_PKTINFO on wildipv4 iface enabled? */
   9 +
  10  #ifdef REFCLOCK
  11  /*
  12   * Refclock stuff.     We keep a chain of structures with data concerning
  13 @@ -1937,6 +1939,17 @@ set_reuseaddr(
  14  #endif /* ! SO_EXCLUSIVEADDRUSE */
  15  }
  16
  17 +static void
  18 +set_pktinfo(int flag)
  19 +{
  20 +       if (wildipv4 == NULL)
  21 +               return;
  22 +       if (setsockopt(wildipv4->fd, SOL_IP, IP_PKTINFO, &flag, sizeof (flag))) {
  23 +               msyslog(LOG_ERR, "set_pktinfo: setsockopt(IP_PKTINFO, %s) failed: %m", flag ? "on" : "off");
  24 +       } else
  25 +               pktinfo_status = flag;
  26 +}
  27 +
  28  /*
  29   * This is just a wrapper around an internal function so we can
  30   * make other changes as necessary later on
  31 @@ -2374,6 +2387,7 @@ io_setbclient(void)
  32                 }
  33         }
  34         set_reuseaddr(0);
  35 +       set_pktinfo(1);
  36         if (nif > 0)
  37                 DPRINTF(1, ("io_setbclient: Opened broadcast clients\n"));
  38         else if (!nif)
  39 @@ -2405,6 +2419,7 @@ io_unsetbclient(void)
  40
  41                 socket_broadcast_disable(interf, &interf->sin);
  42         }
  43 +       set_pktinfo(0);
  44  }
  45
  46  /*
  47 @@ -3130,7 +3145,8 @@ read_network_packet(
  48  #ifdef HAVE_TIMESTAMP
  49         struct msghdr msghdr;
  50         struct iovec iovec;
  51 -       char control[TIMESTAMP_CTLMSGBUF_SIZE];
  52 +       char control[sizeof (struct cmsghdr) * 2 + sizeof (struct timeval) +
  53 +               sizeof (struct in_pktinfo) + 32];
  54  #endif
  55
  56         /*
  57 @@ -3141,7 +3157,7 @@ read_network_packet(
  58          */
  59
  60         rb = get_free_recv_buffer();
  61 -       if (NULL == rb || itf->ignore_packets) {
  62 +       if (NULL == rb || (itf->ignore_packets && !(pktinfo_status && itf == wildipv4))) {
  63                 char buf[RX_BUFF_SIZE];
  64                 sockaddr_u from;
  65
  66 @@ -3201,6 +3217,27 @@ read_network_packet(
  67                 return (buflen);
  68         }
  69
  70 +       if (pktinfo_status && itf->ignore_packets && itf == wildipv4) {
  71 +               /* check for broadcast on 255.255.255.255, exception allowed on wildipv4 */
  72 +               struct cmsghdr *cmsg;
  73 +               struct in_pktinfo *pktinfo = NULL;
  74 +
  75 +               if ((cmsg = CMSG_FIRSTHDR(&msghdr)))
  76 +                       do {
  77 +                               if (cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_PKTINFO)
  78 +                                       pktinfo = (struct in_pktinfo *) CMSG_DATA(cmsg);
  79 +                       } while ((cmsg = CMSG_NXTHDR(&msghdr, cmsg)));
  80 +               if (pktinfo && pktinfo->ipi_addr.s_addr == INADDR_BROADCAST) {
  81 +                       DPRINTF(4, ("INADDR_BROADCAST\n"));
  82 +               } else {
  83 +                       DPRINTF(4, ("%s on (%lu) fd=%d from %s\n", "ignore",
  84 +                               free_recvbuffs(), fd, stoa(&rb->recv_srcadr)));
  85 +                       packets_ignored++;
  86 +                       freerecvbuf(rb);
  87 +                       return (buflen);
  88 +               }
  89 +       }
  90 +
  91         DPRINTF(3, ("read_network_packet: fd=%d length %d from %s\n",
  92                     fd, buflen, stoa(&rb->recv_srcadr)));
  93