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/*
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
*/
#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)
{
zlog_debug("%s: pkt dump size=%d",
label,
size);
zlog_hexdump(buf, size);
}
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