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/*
* PIM for Quagga
* Copyright (C) 2016 Cumulus Networks, Inc.
* Daniel Walton
*
* 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 "pimd.h"
#include "pim_igmp.h"
#include "pim_igmpv2.h"
#include "pim_igmpv3.h"
#include "pim_str.h"
#include "pim_time.h"
#include "pim_util.h"
static void
on_trace (const char *label,
struct interface *ifp, struct in_addr from)
{
if (PIM_DEBUG_IGMP_TRACE) {
char from_str[100];
pim_inet4_dump("<from?>", from, from_str, sizeof(from_str));
zlog_debug("%s: from %s on %s",
label, from_str, ifp->name);
}
}
void
igmp_v2_send_query (struct igmp_group *group,
int fd,
const char *ifname,
char *query_buf,
struct in_addr dst_addr,
struct in_addr group_addr,
int query_max_response_time_dsec)
{
ssize_t msg_size = 8;
uint8_t max_resp_code;
ssize_t sent;
struct sockaddr_in to;
socklen_t tolen;
uint16_t checksum;
/* max_resp_code must be non-zero else this will look like an IGMP v1 query */
max_resp_code = igmp_msg_encode16to8(query_max_response_time_dsec);
zassert(max_resp_code > 0);
query_buf[0] = PIM_IGMP_MEMBERSHIP_QUERY;
query_buf[1] = max_resp_code;
*(uint16_t *)(query_buf + IGMP_CHECKSUM_OFFSET) = 0; /* for computing checksum */
memcpy(query_buf+4, &group_addr, sizeof(struct in_addr));
checksum = in_cksum(query_buf, msg_size);
*(uint16_t *)(query_buf + IGMP_CHECKSUM_OFFSET) = checksum;
if (PIM_DEBUG_IGMP_PACKETS) {
char dst_str[100];
char group_str[100];
pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str));
pim_inet4_dump("<group?>", group_addr, group_str, sizeof(group_str));
zlog_debug("Send IGMPv2 QUERY to %s on %s for group %s",
dst_str, ifname, group_str);
}
memset(&to, 0, sizeof(to));
to.sin_family = AF_INET;
to.sin_addr = dst_addr;
tolen = sizeof(to);
sent = sendto(fd, query_buf, msg_size, MSG_DONTWAIT,
(struct sockaddr *)&to, tolen);
if (sent != (ssize_t) msg_size) {
char dst_str[100];
char group_str[100];
pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str));
pim_inet4_dump("<group?>", group_addr, group_str, sizeof(group_str));
if (sent < 0) {
zlog_warn("Send IGMPv2 QUERY failed due to %s on %s: group=%s msg_size=%zd: errno=%d: %s",
dst_str, ifname, group_str, msg_size, errno, safe_strerror(errno));
}
else {
zlog_warn("Send IGMPv2 QUERY failed due to %s on %s: group=%s msg_size=%zd: sent=%zd",
dst_str, ifname, group_str, msg_size, sent);
}
return;
}
}
int
igmp_v2_recv_report (struct igmp_sock *igmp,
struct in_addr from, const char *from_str,
char *igmp_msg, int igmp_msg_len)
{
struct interface *ifp = igmp->interface;
struct in_addr group_addr;
char group_str[100];
on_trace(__PRETTY_FUNCTION__, igmp->interface, from);
if (igmp_msg_len != IGMP_V12_MSG_SIZE) {
zlog_warn("Recv IGMPv2 REPORT from %s on %s: size=%d other than correct=%d",
from_str, ifp->name, igmp_msg_len, IGMP_V12_MSG_SIZE);
return -1;
}
memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr));
if (PIM_DEBUG_IGMP_PACKETS) {
pim_inet4_dump("<dst?>", group_addr, group_str, sizeof(group_str));
zlog_debug("Recv IGMPv2 REPORT from %s on %s for %s",
from_str, ifp->name, group_str);
}
/*
* RFC 3376
* 7.3.2. In the Presence of Older Version Group Members
*
* When Group Compatibility Mode is IGMPv2, a router internally
* translates the following IGMPv2 messages for that group to their
* IGMPv3 equivalents:
*
* IGMPv2 Message IGMPv3 Equivalent
* -------------- -----------------
* Report IS_EX( {} )
* Leave TO_IN( {} )
*/
igmpv3_report_isex (igmp, from, group_addr, 0, NULL, 1);
return 0;
}
int
igmp_v2_recv_leave (struct igmp_sock *igmp,
struct in_addr from, const char *from_str,
char *igmp_msg, int igmp_msg_len)
{
struct interface *ifp = igmp->interface;
struct in_addr group_addr;
char group_str[100];
on_trace(__PRETTY_FUNCTION__, igmp->interface, from);
if (igmp_msg_len != IGMP_V12_MSG_SIZE) {
zlog_warn("Recv IGMPv2 LEAVE from %s on %s: size=%d other than correct=%d",
from_str, ifp->name, igmp_msg_len, IGMP_V12_MSG_SIZE);
return -1;
}
memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr));
if (PIM_DEBUG_IGMP_PACKETS) {
pim_inet4_dump("<dst?>", group_addr, group_str, sizeof(group_str));
zlog_debug("Recv IGMPv2 LEAVE from %s on %s for %s",
from_str, ifp->name, group_str);
}
memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr));
/*
* RFC 3376
* 7.3.2. In the Presence of Older Version Group Members
*
* When Group Compatibility Mode is IGMPv2, a router internally
* translates the following IGMPv2 messages for that group to their
* IGMPv3 equivalents:
*
* IGMPv2 Message IGMPv3 Equivalent
* -------------- -----------------
* Report IS_EX( {} )
* Leave TO_IN( {} )
*/
igmpv3_report_toin (igmp, from, group_addr, 0, NULL);
return 0;
}
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