1 files changed, 122 insertions, 0 deletions
diff --git a/pimd/pim_util.c b/pimd/pim_util.c
new file mode 100644
index 000000000..fdfed2bf2
--- /dev/null
+++ b/pimd/pim_util.c
@@ -0,0 +1,122 @@
+/*
+  PIM for Quagga
+  Copyright (C) 2008  Everton da Silva Marques
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  General Public License for more details.
+  
+  You should have received a copy of the GNU General Public License
+  along with this program; see the file COPYING; if not, write to the
+  Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+  MA 02110-1301 USA
+  
+  $QuaggaId: $Format:%an, %ai, %h$ $
+*/
+
+#include <zebra.h>
+
+#include "log.h"
+
+#include "pim_util.h"
+
+/*
+  RFC 3376: 4.1.7. QQIC (Querier's Query Interval Code)
+  
+  If QQIC < 128,  QQI = QQIC
+  If QQIC >= 128, QQI = (mant | 0x10) << (exp + 3)
+  
+  0 1 2 3 4 5 6 7
+  +-+-+-+-+-+-+-+-+
+  |1| exp | mant  |
+  +-+-+-+-+-+-+-+-+
+  
+  Since exp=0..7 then (exp+3)=3..10, then QQI has
+  one of the following bit patterns:
+  
+  exp=0: QQI = 0000.0000.1MMM.M000
+  exp=1: QQI = 0000.0001.MMMM.0000
+  ...
+  exp=6: QQI = 001M.MMM0.0000.0000
+  exp=7: QQI = 01MM.MM00.0000.0000
+  --------- ---------
+  0x4  0x0  0x0  0x0
+*/
+uint8_t igmp_msg_encode16to8(uint16_t value)
+{
+  uint8_t code;
+
+  if (value < 128) {
+    code = value;
+  }
+  else {
+    uint16_t mask = 0x4000;
+    uint8_t  exp;
+    uint16_t mant;
+    for (exp = 7; exp > 0; --exp) {
+      if (mask & value)
+	break;
+      mask >>= 1;
+    }
+    mant = 0x000F & (value >> (exp + 3));
+    code = ((uint8_t) 1 << 7) | ((uint8_t) exp << 4) | (uint8_t) mant;
+  }
+
+  return code;
+}
+
+/*
+  RFC 3376: 4.1.7. QQIC (Querier's Query Interval Code)
+  
+  If QQIC < 128,  QQI = QQIC
+  If QQIC >= 128, QQI = (mant | 0x10) << (exp + 3)
+  
+  0 1 2 3 4 5 6 7
+  +-+-+-+-+-+-+-+-+
+  |1| exp | mant  |
+  +-+-+-+-+-+-+-+-+
+*/
+uint16_t igmp_msg_decode8to16(uint8_t code)
+{
+  uint16_t value;
+
+  if (code < 128) {
+    value = code;
+  }
+  else {
+    uint16_t mant = (code & 0x0F);
+    uint8_t  exp  = (code & 0x70) >> 4;
+    value = (mant | 0x10) << (exp + 3);
+  }
+
+  return value;
+}
+
+void pim_pkt_dump(const char *label, const uint8_t *buf, int size)
+{
+  char dump_buf[1000];
+  int i = 0;
+  int j = 0;
+
+  for (; i < size; ++i, j += 2) {
+    int left = sizeof(dump_buf) - j;
+    if (left < 4) {
+      if (left > 1) {
+	strcat(dump_buf + j, "!"); /* mark as truncated */
+      }
+      break;
+    }
+    snprintf(dump_buf + j, left, "%02x", buf[i]);
+  }
+
+  zlog_debug("%s: pkt dump size=%d: %s",
+	     label,
+	     size,
+	     dump_buf);
+}