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140 lines
3.0 KiB
C
140 lines
3.0 KiB
C
/*
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* PIM for Quagga
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* Copyright (C) 2008 Everton da Silva Marques
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; see the file COPYING; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <zebra.h>
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#include "log.h"
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#include "prefix.h"
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#include "pim_util.h"
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/*
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RFC 3376: 4.1.7. QQIC (Querier's Query Interval Code)
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If QQIC < 128, QQI = QQIC
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If QQIC >= 128, QQI = (mant | 0x10) << (exp + 3)
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0 1 2 3 4 5 6 7
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+-+-+-+-+-+-+-+-+
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|1| exp | mant |
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+-+-+-+-+-+-+-+-+
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Since exp=0..7 then (exp+3)=3..10, then QQI has
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one of the following bit patterns:
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exp=0: QQI = 0000.0000.1MMM.M000
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exp=1: QQI = 0000.0001.MMMM.0000
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...
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exp=6: QQI = 001M.MMM0.0000.0000
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exp=7: QQI = 01MM.MM00.0000.0000
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--------- ---------
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0x4 0x0 0x0 0x0
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*/
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uint8_t igmp_msg_encode16to8(uint16_t value)
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{
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uint8_t code;
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if (value < 128) {
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code = value;
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} else {
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uint16_t mask = 0x4000;
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uint8_t exp;
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uint16_t mant;
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for (exp = 7; exp > 0; --exp) {
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if (mask & value)
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break;
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mask >>= 1;
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}
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mant = 0x000F & (value >> (exp + 3));
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code = ((uint8_t)1 << 7) | ((uint8_t)exp << 4) | (uint8_t)mant;
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}
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return code;
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}
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/*
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RFC 3376: 4.1.7. QQIC (Querier's Query Interval Code)
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If QQIC < 128, QQI = QQIC
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If QQIC >= 128, QQI = (mant | 0x10) << (exp + 3)
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0 1 2 3 4 5 6 7
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+-+-+-+-+-+-+-+-+
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|1| exp | mant |
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+-+-+-+-+-+-+-+-+
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*/
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uint16_t igmp_msg_decode8to16(uint8_t code)
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{
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uint16_t value;
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if (code < 128) {
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value = code;
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} else {
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uint16_t mant = (code & 0x0F);
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uint8_t exp = (code & 0x70) >> 4;
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value = (mant | 0x10) << (exp + 3);
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}
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return value;
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}
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void pim_pkt_dump(const char *label, const uint8_t *buf, int size)
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{
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zlog_debug("%s: pkt dump size=%d", label, size);
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zlog_hexdump(buf, size);
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}
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int pim_is_group_224_0_0_0_24(struct in_addr group_addr)
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{
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static int first = 1;
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static struct prefix group_224;
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struct prefix group;
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if (first) {
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if (!str2prefix("224.0.0.0/24", &group_224))
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return 0;
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first = 0;
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}
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group.family = AF_INET;
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group.u.prefix4 = group_addr;
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group.prefixlen = 32;
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return prefix_match(&group_224, &group);
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}
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int pim_is_group_224_4(struct in_addr group_addr)
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{
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static int first = 1;
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static struct prefix group_all;
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struct prefix group;
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if (first) {
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if (!str2prefix("224.0.0.0/4", &group_all))
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return 0;
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first = 0;
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}
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group.family = AF_INET;
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group.u.prefix4 = group_addr;
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group.prefixlen = 32;
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return prefix_match(&group_all, &group);
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}
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