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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 "prefix.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);
}
int pim_is_group_224_0_0_0_24(struct in_addr group_addr)
{
static int first = 1;
static struct prefix group_224;
struct prefix group;
if (first) {
if (!str2prefix("224.0.0.0/24", &group_224))
return 0;
first = 0;
}
group.family = AF_INET;
group.u.prefix4 = group_addr;
group.prefixlen = 32;
return prefix_match(&group_224, &group);
}
int pim_is_group_224_4(struct in_addr group_addr)
{
static int first = 1;
static struct prefix group_all;
struct prefix group;
if (first) {
if (!str2prefix("224.0.0.0/4", &group_all))
return 0;
first = 0;
}
group.family = AF_INET;
group.u.prefix4 = group_addr;
group.prefixlen = 32;
return prefix_match(&group_all, &group);
}
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