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pim_igmpv3.c
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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 "memory.h"
#include "if.h"
#include "lib_errors.h"
#include "pimd.h"
#include "pim_iface.h"
#include "pim_igmp.h"
#include "pim_igmpv3.h"
#include "pim_str.h"
#include "pim_util.h"
#include "pim_time.h"
#include "pim_zebra.h"
#include "pim_oil.h"
static void group_retransmit_timer_on(struct igmp_group *group);
static long igmp_group_timer_remain_msec(struct igmp_group *group);
static long igmp_source_timer_remain_msec(struct igmp_source *source);
static void group_query_send(struct igmp_group *group);
static void source_query_send_by_flag(struct igmp_group *group,
int num_sources_tosend);
static void on_trace(const char *label, struct interface *ifp,
struct in_addr from, struct in_addr group_addr,
int num_sources, struct in_addr *sources)
{
if (PIM_DEBUG_IGMP_TRACE) {
char from_str[INET_ADDRSTRLEN];
char group_str[INET_ADDRSTRLEN];
pim_inet4_dump("<from?>", from, from_str, sizeof(from_str));
pim_inet4_dump("<group?>", group_addr, group_str,
sizeof(group_str));
zlog_debug("%s: from %s on %s: group=%s sources=%d", label,
from_str, ifp->name, group_str, num_sources);
}
}
void igmp_group_reset_gmi(struct igmp_group *group)
{
long group_membership_interval_msec;
struct pim_interface *pim_ifp;
struct igmp_sock *igmp;
struct interface *ifp;
igmp = group->group_igmp_sock;
ifp = igmp->interface;
pim_ifp = ifp->info;
/*
RFC 3376: 8.4. Group Membership Interval
The Group Membership Interval is the amount of time that must pass
before a multicast router decides there are no more members of a
group or a particular source on a network.
This value MUST be ((the Robustness Variable) times (the Query
Interval)) plus (one Query Response Interval).
group_membership_interval_msec = querier_robustness_variable *
(1000 * querier_query_interval) +
100 * query_response_interval_dsec;
*/
group_membership_interval_msec = PIM_IGMP_GMI_MSEC(
igmp->querier_robustness_variable, igmp->querier_query_interval,
pim_ifp->igmp_query_max_response_time_dsec);
if (PIM_DEBUG_IGMP_TRACE) {
char group_str[INET_ADDRSTRLEN];
pim_inet4_dump("<group?>", group->group_addr, group_str,
sizeof(group_str));
zlog_debug(
"Resetting group %s timer to GMI=%ld.%03ld sec on %s",
group_str, group_membership_interval_msec / 1000,
group_membership_interval_msec % 1000, ifp->name);
}
/*
RFC 3376: 6.2.2. Definition of Group Timers
The group timer is only used when a group is in EXCLUDE mode and
it represents the time for the *filter-mode* of the group to
expire and switch to INCLUDE mode.
*/
zassert(group->group_filtermode_isexcl);
igmp_group_timer_on(group, group_membership_interval_msec, ifp->name);
}
static int igmp_source_timer(struct thread *t)
{
struct igmp_source *source;
struct igmp_group *group;
source = THREAD_ARG(t);
group = source->source_group;
if (PIM_DEBUG_IGMP_TRACE) {
char group_str[INET_ADDRSTRLEN];
char source_str[INET_ADDRSTRLEN];
pim_inet4_dump("<group?>", group->group_addr, group_str,
sizeof(group_str));
pim_inet4_dump("<source?>", source->source_addr, source_str,
sizeof(source_str));
zlog_debug(
"%s: Source timer expired for group %s source %s on %s",
__PRETTY_FUNCTION__, group_str, source_str,
group->group_igmp_sock->interface->name);
}
/*
RFC 3376: 6.3. IGMPv3 Source-Specific Forwarding Rules
Group
Filter-Mode Source Timer Value Action
----------- ------------------ ------
INCLUDE TIMER == 0 Suggest to stop forwarding
traffic from source and
remove source record. If
there are no more source
records for the group, delete
group record.
EXCLUDE TIMER == 0 Suggest to not forward
traffic from source
(DO NOT remove record)
Source timer switched from (T > 0) to (T == 0): disable forwarding.
*/
if (group->group_filtermode_isexcl) {
/* EXCLUDE mode */
igmp_source_forward_stop(source);
} else {
/* INCLUDE mode */
/* igmp_source_delete() will stop forwarding source */
igmp_source_delete(source);
/*
If there are no more source records for the group, delete
group
record.
*/
if (!listcount(group->group_source_list)) {
igmp_group_delete_empty_include(group);
}
}
return 0;
}
static void source_timer_off(struct igmp_group *group,
struct igmp_source *source)
{
if (!source->t_source_timer)
return;
if (PIM_DEBUG_IGMP_TRACE) {
char group_str[INET_ADDRSTRLEN];
char source_str[INET_ADDRSTRLEN];
pim_inet4_dump("<group?>", group->group_addr, group_str,
sizeof(group_str));
pim_inet4_dump("<source?>", source->source_addr, source_str,
sizeof(source_str));
zlog_debug(
"Cancelling TIMER event for group %s source %s on %s",
group_str, source_str,
group->group_igmp_sock->interface->name);
}
THREAD_OFF(source->t_source_timer);
}
static void igmp_source_timer_on(struct igmp_group *group,
struct igmp_source *source, long interval_msec)
{
source_timer_off(group, source);
struct pim_interface *pim_ifp = group->group_igmp_sock->interface->info;
if (PIM_DEBUG_IGMP_EVENTS) {
char group_str[INET_ADDRSTRLEN];
char source_str[INET_ADDRSTRLEN];
pim_inet4_dump("<group?>", group->group_addr, group_str,
sizeof(group_str));
pim_inet4_dump("<source?>", source->source_addr, source_str,
sizeof(source_str));
zlog_debug(
"Scheduling %ld.%03ld sec TIMER event for group %s source %s on %s",
interval_msec / 1000, interval_msec % 1000, group_str,
source_str, group->group_igmp_sock->interface->name);
}
thread_add_timer_msec(router->master, igmp_source_timer, source,
interval_msec, &source->t_source_timer);
/*
RFC 3376: 6.3. IGMPv3 Source-Specific Forwarding Rules
Source timer switched from (T == 0) to (T > 0): enable forwarding.
*/
igmp_source_forward_start(pim_ifp->pim, source);
}
void igmp_source_reset_gmi(struct igmp_sock *igmp, struct igmp_group *group,
struct igmp_source *source)
{
long group_membership_interval_msec;
struct pim_interface *pim_ifp;
struct interface *ifp;
ifp = igmp->interface;
pim_ifp = ifp->info;
group_membership_interval_msec = PIM_IGMP_GMI_MSEC(
igmp->querier_robustness_variable, igmp->querier_query_interval,
pim_ifp->igmp_query_max_response_time_dsec);
if (PIM_DEBUG_IGMP_TRACE) {
char group_str[INET_ADDRSTRLEN];
char source_str[INET_ADDRSTRLEN];
pim_inet4_dump("<group?>", group->group_addr, group_str,
sizeof(group_str));
pim_inet4_dump("<source?>", source->source_addr, source_str,
sizeof(source_str));
zlog_debug(
"Resetting source %s timer to GMI=%ld.%03ld sec for group %s on %s",
source_str, group_membership_interval_msec / 1000,
group_membership_interval_msec % 1000, group_str,
ifp->name);
}
igmp_source_timer_on(group, source, group_membership_interval_msec);
}
static void source_mark_delete_flag(struct igmp_group *group)
{
struct listnode *src_node;
struct igmp_source *src;
for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) {
IGMP_SOURCE_DO_DELETE(src->source_flags);
}
}
static void source_mark_send_flag(struct igmp_group *group)
{
struct listnode *src_node;
struct igmp_source *src;
for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) {
IGMP_SOURCE_DO_SEND(src->source_flags);
}
}
static int source_mark_send_flag_by_timer(struct igmp_group *group)
{
struct listnode *src_node;
struct igmp_source *src;
int num_marked_sources = 0;
for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src)) {
/* Is source timer running? */
if (src->t_source_timer) {
IGMP_SOURCE_DO_SEND(src->source_flags);
++num_marked_sources;
} else {
IGMP_SOURCE_DONT_SEND(src->source_flags);
}
}
return num_marked_sources;
}
static void source_clear_send_flag(struct list *source_list)
{
struct listnode *src_node;
struct igmp_source *src;
for (ALL_LIST_ELEMENTS_RO(source_list, src_node, src)) {
IGMP_SOURCE_DONT_SEND(src->source_flags);
}
}
/*
Any source (*,G) is forwarded only if mode is EXCLUDE {empty}
*/
static void group_exclude_fwd_anysrc_ifempty(struct igmp_group *group)
{
struct pim_interface *pim_ifp = group->group_igmp_sock->interface->info;
zassert(group->group_filtermode_isexcl);
if (listcount(group->group_source_list) < 1) {
igmp_anysource_forward_start(pim_ifp->pim, group);
}
}
void igmp_source_free(struct igmp_source *source)
{
/* make sure there is no source timer running */
zassert(!source->t_source_timer);
XFREE(MTYPE_PIM_IGMP_GROUP_SOURCE, source);
}
static void source_channel_oil_detach(struct igmp_source *source)
{
if (source->source_channel_oil) {
pim_channel_oil_del(source->source_channel_oil,
__PRETTY_FUNCTION__);
source->source_channel_oil = NULL;
}
}
/*
igmp_source_delete: stop fowarding, and delete the source
igmp_source_forward_stop: stop fowarding, but keep the source
*/
void igmp_source_delete(struct igmp_source *source)
{
struct igmp_group *group;
struct in_addr src;
group = source->source_group;
if (PIM_DEBUG_IGMP_TRACE) {
char group_str[INET_ADDRSTRLEN];
char source_str[INET_ADDRSTRLEN];
pim_inet4_dump("<group?>", group->group_addr, group_str,
sizeof(group_str));
pim_inet4_dump("<source?>", source->source_addr, source_str,
sizeof(source_str));
zlog_debug(
"Deleting IGMP source %s for group %s from socket %d interface %s c_oil ref_count %d",
source_str, group_str, group->group_igmp_sock->fd,
group->group_igmp_sock->interface->name,
source->source_channel_oil
? source->source_channel_oil->oil_ref_count
: 0);
}
source_timer_off(group, source);
igmp_source_forward_stop(source);
/* sanity check that forwarding has been disabled */
if (IGMP_SOURCE_TEST_FORWARDING(source->source_flags)) {
char group_str[INET_ADDRSTRLEN];
char source_str[INET_ADDRSTRLEN];
pim_inet4_dump("<group?>", group->group_addr, group_str,
sizeof(group_str));
pim_inet4_dump("<source?>", source->source_addr, source_str,
sizeof(source_str));
zlog_warn(
"%s: forwarding=ON(!) IGMP source %s for group %s from socket %d interface %s",
__PRETTY_FUNCTION__, source_str, group_str,
group->group_igmp_sock->fd,
group->group_igmp_sock->interface->name);
/* warning only */
}
source_channel_oil_detach(source);
/*
notice that listnode_delete() can't be moved
into igmp_source_free() because the later is
called by list_delete_all_node()
*/
listnode_delete(group->group_source_list, source);
src.s_addr = source->source_addr.s_addr;
igmp_source_free(source);
/* Group source list is empty and current source is * then
*,G group going away so do not trigger start */
if (group->group_filtermode_isexcl
&& (listcount(group->group_source_list) != 0)
&& src.s_addr != INADDR_ANY) {
group_exclude_fwd_anysrc_ifempty(group);
}
}
static void source_delete_by_flag(struct list *source_list)
{
struct listnode *src_node;
struct listnode *src_nextnode;
struct igmp_source *src;
for (ALL_LIST_ELEMENTS(source_list, src_node, src_nextnode, src))
if (IGMP_SOURCE_TEST_DELETE(src->source_flags))
igmp_source_delete(src);
}
void igmp_source_delete_expired(struct list *source_list)
{
struct listnode *src_node;
struct listnode *src_nextnode;
struct igmp_source *src;
for (ALL_LIST_ELEMENTS(source_list, src_node, src_nextnode, src))
if (!src->t_source_timer)
igmp_source_delete(src);
}
struct igmp_source *igmp_find_source_by_addr(struct igmp_group *group,
struct in_addr src_addr)
{
struct listnode *src_node;
struct igmp_source *src;
for (ALL_LIST_ELEMENTS_RO(group->group_source_list, src_node, src))
if (src_addr.s_addr == src->source_addr.s_addr)
return src;
return 0;
}
struct igmp_source *source_new(struct igmp_group *group,
struct in_addr src_addr)
{
struct igmp_source *src;
if (PIM_DEBUG_IGMP_TRACE) {
char group_str[INET_ADDRSTRLEN];
char source_str[INET_ADDRSTRLEN];
pim_inet4_dump("<group?>", group->group_addr, group_str,
sizeof(group_str));
pim_inet4_dump("<source?>", src_addr, source_str,
sizeof(source_str));
zlog_debug(
"Creating new IGMP source %s for group %s on socket %d interface %s",
source_str, group_str, group->group_igmp_sock->fd,
group->group_igmp_sock->interface->name);
}
src = XCALLOC(MTYPE_PIM_IGMP_GROUP_SOURCE, sizeof(*src));
src->t_source_timer = NULL;
src->source_group = group; /* back pointer */
src->source_addr = src_addr;
src->source_creation = pim_time_monotonic_sec();
src->source_flags = 0;
src->source_query_retransmit_count = 0;
src->source_channel_oil = NULL;
listnode_add(group->group_source_list, src);
/* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */
igmp_anysource_forward_stop(group);
return src;
}
static struct igmp_source *add_source_by_addr(struct igmp_sock *igmp,
struct igmp_group *group,
struct in_addr src_addr)
{
struct igmp_source *src;
src = igmp_find_source_by_addr(group, src_addr);
if (src) {
return src;
}
src = source_new(group, src_addr);
return src;
}
static void allow(struct igmp_sock *igmp, struct in_addr from,
struct in_addr group_addr, int num_sources,
struct in_addr *sources)
{
struct igmp_source *source;
struct igmp_group *group;
int i;
/* non-existant group is created as INCLUDE {empty} */
group = igmp_add_group_by_addr(igmp, group_addr);
if (!group) {
return;
}
/* scan received sources */
for (i = 0; i < num_sources; ++i) {
struct in_addr *src_addr;
src_addr = sources + i;
source = add_source_by_addr(igmp, group, *src_addr);
if (!source) {
continue;
}
/*
RFC 3376: 6.4.1. Reception of Current-State Records
When receiving IS_IN reports for groups in EXCLUDE mode is
sources should be moved from set with (timers = 0) to set with
(timers > 0).
igmp_source_reset_gmi() below, resetting the source timers to
GMI, accomplishes this.
*/
igmp_source_reset_gmi(igmp, group, source);
} /* scan received sources */
if ((num_sources == 0) && (group->group_filtermode_isexcl)
&& (listcount(group->group_source_list) == 1)) {
struct in_addr star = {.s_addr = INADDR_ANY};
source = igmp_find_source_by_addr(group, star);
if (source)
igmp_source_reset_gmi(igmp, group, source);
}
}
void igmpv3_report_isin(struct igmp_sock *igmp, struct in_addr from,
struct in_addr group_addr, int num_sources,
struct in_addr *sources)
{
on_trace(__PRETTY_FUNCTION__, igmp->interface, from, group_addr,
num_sources, sources);
allow(igmp, from, group_addr, num_sources, sources);
}
static void isex_excl(struct igmp_group *group, int num_sources,
struct in_addr *sources)
{
struct igmp_source *source;
int i;
/* EXCLUDE mode */
zassert(group->group_filtermode_isexcl);
/* E.1: set deletion flag for known sources (X,Y) */
source_mark_delete_flag(group);
/* scan received sources (A) */
for (i = 0; i < num_sources; ++i) {
struct in_addr *src_addr;
src_addr = sources + i;
/* E.2: lookup reported source from (A) in (X,Y) */
source = igmp_find_source_by_addr(group, *src_addr);
if (source) {
/* E.3: if found, clear deletion flag: (X*A) or (Y*A) */
IGMP_SOURCE_DONT_DELETE(source->source_flags);
} else {
/* E.4: if not found, create source with timer=GMI:
* (A-X-Y) */
source = source_new(group, *src_addr);
zassert(!source->t_source_timer); /* timer == 0 */
igmp_source_reset_gmi(group->group_igmp_sock, group,
source);
zassert(source->t_source_timer); /* (A-X-Y) timer > 0 */
}
} /* scan received sources */
/*
* If we are in isexcl mode and num_sources == 0
* than that means we have a *,g entry that
* needs to be handled
*/
if (group->group_filtermode_isexcl && num_sources == 0) {
struct in_addr star = {.s_addr = INADDR_ANY};
source = igmp_find_source_by_addr(group, star);
if (source) {
IGMP_SOURCE_DONT_DELETE(source->source_flags);
igmp_source_reset_gmi(group->group_igmp_sock, group,
source);
}
}
/* E.5: delete all sources marked with deletion flag: (X-A) and (Y-A) */
source_delete_by_flag(group->group_source_list);
}
static void isex_incl(struct igmp_group *group, int num_sources,
struct in_addr *sources)
{
int i;
/* INCLUDE mode */
zassert(!group->group_filtermode_isexcl);
/* I.1: set deletion flag for known sources (A) */
source_mark_delete_flag(group);
/* scan received sources (B) */
for (i = 0; i < num_sources; ++i) {
struct igmp_source *source;
struct in_addr *src_addr;
src_addr = sources + i;
/* I.2: lookup reported source (B) */
source = igmp_find_source_by_addr(group, *src_addr);
if (source) {
/* I.3: if found, clear deletion flag (A*B) */
IGMP_SOURCE_DONT_DELETE(source->source_flags);
} else {
/* I.4: if not found, create source with timer=0 (B-A)
*/
source = source_new(group, *src_addr);
zassert(!source->t_source_timer); /* (B-A) timer=0 */
}
} /* scan received sources */
/* I.5: delete all sources marked with deletion flag (A-B) */
source_delete_by_flag(group->group_source_list);
group->group_filtermode_isexcl = 1; /* boolean=true */
zassert(group->group_filtermode_isexcl);
group_exclude_fwd_anysrc_ifempty(group);
}
void igmpv3_report_isex(struct igmp_sock *igmp, struct in_addr from,
struct in_addr group_addr, int num_sources,
struct in_addr *sources, int from_igmp_v2_report)
{
struct interface *ifp = igmp->interface;
struct igmp_group *group;
on_trace(__PRETTY_FUNCTION__, ifp, from, group_addr, num_sources,
sources);
if (pim_is_group_filtered(ifp->info, &group_addr))
return;
/* non-existant group is created as INCLUDE {empty} */
group = igmp_add_group_by_addr(igmp, group_addr);
if (!group) {
return;
}
/* So we can display how we learned the group in our show command output
*/
if (from_igmp_v2_report)
group->igmp_version = 2;
if (group->group_filtermode_isexcl) {
/* EXCLUDE mode */
isex_excl(group, num_sources, sources);
} else {
/* INCLUDE mode */
isex_incl(group, num_sources, sources);
zassert(group->group_filtermode_isexcl);
}
zassert(group->group_filtermode_isexcl);
igmp_group_reset_gmi(group);
}
static void toin_incl(struct igmp_group *group, int num_sources,
struct in_addr *sources)
{
struct igmp_sock *igmp = group->group_igmp_sock;
int num_sources_tosend = listcount(group->group_source_list);
int i;
/* Set SEND flag for all known sources (A) */
source_mark_send_flag(group);
/* Scan received sources (B) */
for (i = 0; i < num_sources; ++i) {
struct igmp_source *source;
struct in_addr *src_addr;
src_addr = sources + i;
/* Lookup reported source (B) */
source = igmp_find_source_by_addr(group, *src_addr);
if (source) {
/* If found, clear SEND flag (A*B) */
IGMP_SOURCE_DONT_SEND(source->source_flags);
--num_sources_tosend;
} else {
/* If not found, create new source */
source = source_new(group, *src_addr);
}
/* (B)=GMI */
igmp_source_reset_gmi(igmp, group, source);
}
/* Send sources marked with SEND flag: Q(G,A-B) */
if (num_sources_tosend > 0) {
source_query_send_by_flag(group, num_sources_tosend);
}
}
static void toin_excl(struct igmp_group *group, int num_sources,
struct in_addr *sources)
{
struct igmp_sock *igmp = group->group_igmp_sock;
int num_sources_tosend;
int i;
/* Set SEND flag for X (sources with timer > 0) */
num_sources_tosend = source_mark_send_flag_by_timer(group);
/* Scan received sources (A) */
for (i = 0; i < num_sources; ++i) {
struct igmp_source *source;
struct in_addr *src_addr;
src_addr = sources + i;
/* Lookup reported source (A) */
source = igmp_find_source_by_addr(group, *src_addr);
if (source) {
if (source->t_source_timer) {
/* If found and timer running, clear SEND flag
* (X*A) */
IGMP_SOURCE_DONT_SEND(source->source_flags);
--num_sources_tosend;
}
} else {
/* If not found, create new source */
source = source_new(group, *src_addr);
}
/* (A)=GMI */
igmp_source_reset_gmi(igmp, group, source);
}
/* Send sources marked with SEND flag: Q(G,X-A) */
if (num_sources_tosend > 0) {
source_query_send_by_flag(group, num_sources_tosend);
}
/* Send Q(G) */
group_query_send(group);
}
void igmpv3_report_toin(struct igmp_sock *igmp, struct in_addr from,
struct in_addr group_addr, int num_sources,
struct in_addr *sources)
{
struct interface *ifp = igmp->interface;
struct igmp_group *group;
on_trace(__PRETTY_FUNCTION__, ifp, from, group_addr, num_sources,
sources);
/*
* If the requested filter mode is INCLUDE *and* the requested source
* list is empty, then the entry corresponding to the requested
* interface and multicast address is deleted if present. If no such
* entry is present, the request is ignored.
*/
if (num_sources) {
/* non-existant group is created as INCLUDE {empty} */
group = igmp_add_group_by_addr(igmp, group_addr);
if (!group) {
return;
}
} else {
group = find_group_by_addr(igmp, group_addr);
if (!group)
return;
}
if (group->group_filtermode_isexcl) {
/* EXCLUDE mode */
toin_excl(group, num_sources, sources);
} else {
/* INCLUDE mode */
toin_incl(group, num_sources, sources);
}
}
static void toex_incl(struct igmp_group *group, int num_sources,
struct in_addr *sources)
{
int num_sources_tosend = 0;
int i;
zassert(!group->group_filtermode_isexcl);
/* Set DELETE flag for all known sources (A) */
source_mark_delete_flag(group);
/* Clear off SEND flag from all known sources (A) */
source_clear_send_flag(group->group_source_list);
/* Scan received sources (B) */
for (i = 0; i < num_sources; ++i) {
struct igmp_source *source;
struct in_addr *src_addr;
src_addr = sources + i;
/* Lookup reported source (B) */
source = igmp_find_source_by_addr(group, *src_addr);
if (source) {
/* If found, clear deletion flag: (A*B) */
IGMP_SOURCE_DONT_DELETE(source->source_flags);
/* and set SEND flag (A*B) */
IGMP_SOURCE_DO_SEND(source->source_flags);
++num_sources_tosend;
} else {
/* If source not found, create source with timer=0:
* (B-A)=0 */
source = source_new(group, *src_addr);
zassert(!source->t_source_timer); /* (B-A) timer=0 */
}
} /* Scan received sources (B) */
group->group_filtermode_isexcl = 1; /* boolean=true */
/* Delete all sources marked with DELETE flag (A-B) */
source_delete_by_flag(group->group_source_list);
/* Send sources marked with SEND flag: Q(G,A*B) */
if (num_sources_tosend > 0) {
source_query_send_by_flag(group, num_sources_tosend);
}
zassert(group->group_filtermode_isexcl);
group_exclude_fwd_anysrc_ifempty(group);
}
static void toex_excl(struct igmp_group *group, int num_sources,
struct in_addr *sources)
{
int num_sources_tosend = 0;
int i;
/* set DELETE flag for all known sources (X,Y) */
source_mark_delete_flag(group);
/* clear off SEND flag from all known sources (X,Y) */
source_clear_send_flag(group->group_source_list);
if (num_sources == 0) {
struct igmp_source *source;
struct in_addr any = {.s_addr = INADDR_ANY};
source = igmp_find_source_by_addr(group, any);
if (source)
IGMP_SOURCE_DONT_DELETE(source->source_flags);
}
/* scan received sources (A) */
for (i = 0; i < num_sources; ++i) {
struct igmp_source *source;
struct in_addr *src_addr;
src_addr = sources + i;
/* lookup reported source (A) in known sources (X,Y) */
source = igmp_find_source_by_addr(group, *src_addr);
if (source) {
/* if found, clear off DELETE flag from reported source
* (A) */
IGMP_SOURCE_DONT_DELETE(source->source_flags);
} else {
/* if not found, create source with Group Timer:
* (A-X-Y)=Group Timer */
long group_timer_msec;
source = source_new(group, *src_addr);
zassert(!source->t_source_timer); /* timer == 0 */
group_timer_msec = igmp_group_timer_remain_msec(group);
igmp_source_timer_on(group, source, group_timer_msec);
zassert(source->t_source_timer); /* (A-X-Y) timer > 0 */
/* make sure source is created with DELETE flag unset */
zassert(!IGMP_SOURCE_TEST_DELETE(source->source_flags));
}
/* make sure reported source has DELETE flag unset */
zassert(!IGMP_SOURCE_TEST_DELETE(source->source_flags));
if (source->t_source_timer) {
/* if source timer>0 mark SEND flag: Q(G,A-Y) */
IGMP_SOURCE_DO_SEND(source->source_flags);
++num_sources_tosend;
}
} /* scan received sources (A) */
/*
delete all sources marked with DELETE flag:
Delete (X-A)
Delete (Y-A)
*/
source_delete_by_flag(group->group_source_list);
/* send sources marked with SEND flag: Q(G,A-Y) */
if (num_sources_tosend > 0) {
source_query_send_by_flag(group, num_sources_tosend);
}
}
void igmpv3_report_toex(struct igmp_sock *igmp, struct in_addr from,
struct in_addr group_addr, int num_sources,
struct in_addr *sources)
{
struct interface *ifp = igmp->interface;
struct igmp_group *group;
on_trace(__PRETTY_FUNCTION__, ifp, from, group_addr, num_sources,
sources);
/* non-existant group is created as INCLUDE {empty} */
group = igmp_add_group_by_addr(igmp, group_addr);
if (!group) {
return;
}
if (group->group_filtermode_isexcl) {
/* EXCLUDE mode */
toex_excl(group, num_sources, sources);
} else {
/* INCLUDE mode */
toex_incl(group, num_sources, sources);
zassert(group->group_filtermode_isexcl);
}
zassert(group->group_filtermode_isexcl);
/* Group Timer=GMI */
igmp_group_reset_gmi(group);
}
void igmpv3_report_allow(struct igmp_sock *igmp, struct in_addr from,
struct in_addr group_addr, int num_sources,
struct in_addr *sources)
{
on_trace(__PRETTY_FUNCTION__, igmp->interface, from, group_addr,
num_sources, sources);
allow(igmp, from, group_addr, num_sources, sources);
}
/*
RFC3376: 6.6.3.1. Building and Sending Group Specific Queries
When transmitting a group specific query, if the group timer is
larger than LMQT, the "Suppress Router-Side Processing" bit is set
in the query message.
*/
static void group_retransmit_group(struct igmp_group *group)
{
struct igmp_sock *igmp;
struct pim_interface *pim_ifp;
long lmqc; /* Last Member Query Count */
long lmqi_msec; /* Last Member Query Interval */
long lmqt_msec; /* Last Member Query Time */
int s_flag;
int query_buf_size;
igmp = group->group_igmp_sock;
pim_ifp = igmp->interface->info;
if (pim_ifp->igmp_version == 3) {
query_buf_size = PIM_IGMP_BUFSIZE_WRITE;
} else {
query_buf_size = IGMP_V12_MSG_SIZE;
}
char query_buf[query_buf_size];