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pim_igmpv3.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* PIM for Quagga
* Copyright (C) 2008 Everton da Silva Marques
*/
#include <zebra.h>
#include "log.h"
#include "memory.h"
#include "if.h"
#include "lib_errors.h"
#include "pimd.h"
#include "pim_instance.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"
#include "pim_ssm.h"
static void group_retransmit_timer_on(struct gm_group *group);
static long igmp_group_timer_remain_msec(struct gm_group *group);
static long igmp_source_timer_remain_msec(struct gm_source *source);
static void group_query_send(struct gm_group *group);
static void source_query_send_by_flag(struct gm_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_GM_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);
}
}
static inline long igmp_gmi_msec(struct gm_group *group)
{
struct pim_interface *pim_ifp = group->interface->info;
struct gm_sock *igmp;
struct listnode *sock_node;
long qrv = 0, qqi = 0;
for (ALL_LIST_ELEMENTS_RO(pim_ifp->gm_socket_list, sock_node, igmp)) {
qrv = MAX(qrv, igmp->querier_robustness_variable);
qqi = MAX(qqi, igmp->querier_query_interval);
}
return PIM_IGMP_GMI_MSEC(qrv, qqi,
pim_ifp->gm_query_max_response_time_dsec);
}
void igmp_group_reset_gmi(struct gm_group *group)
{
long group_membership_interval_msec;
struct interface *ifp;
ifp = group->interface;
/*
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 = igmp_gmi_msec(group);
if (PIM_DEBUG_GM_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.
*/
assert(group->group_filtermode_isexcl);
igmp_group_timer_on(group, group_membership_interval_msec, ifp->name);
}
static void igmp_source_timer(struct event *t)
{
struct gm_source *source;
struct gm_group *group;
source = EVENT_ARG(t);
group = source->source_group;
if (PIM_DEBUG_GM_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",
__func__, group_str, source_str,
group->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);
}
}
}
static void source_timer_off(struct gm_group *group, struct gm_source *source)
{
if (!source->t_source_timer)
return;
if (PIM_DEBUG_GM_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->interface->name);
}
EVENT_OFF(source->t_source_timer);
}
static void igmp_source_timer_on(struct gm_group *group,
struct gm_source *source, long interval_msec)
{
source_timer_off(group, source);
struct pim_interface *pim_ifp = group->interface->info;
if (PIM_DEBUG_GM_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->interface->name);
}
event_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 gm_group *group, struct gm_source *source)
{
long group_membership_interval_msec;
struct interface *ifp;
ifp = group->interface;
group_membership_interval_msec = igmp_gmi_msec(group);
if (PIM_DEBUG_GM_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 gm_group *group)
{
struct listnode *src_node;
struct gm_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 gm_group *group)
{
struct listnode *src_node;
struct gm_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 gm_group *group)
{
struct listnode *src_node;
struct gm_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 gm_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 gm_group *group)
{
struct pim_interface *pim_ifp = group->interface->info;
assert(group->group_filtermode_isexcl);
if (listcount(group->group_source_list) < 1) {
igmp_anysource_forward_start(pim_ifp->pim, group);
}
}
void igmp_source_free(struct gm_source *source)
{
/* make sure there is no source timer running */
assert(!source->t_source_timer);
XFREE(MTYPE_PIM_IGMP_GROUP_SOURCE, source);
}
/*
igmp_source_delete: stop forwarding, and delete the source
igmp_source_forward_stop: stop forwarding, but keep the source
*/
void igmp_source_delete(struct gm_source *source)
{
struct gm_group *group;
struct in_addr src;
group = source->source_group;
if (PIM_DEBUG_GM_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 interface %s c_oil ref_count %d",
source_str, group_str, group->interface->name,
source->source_channel_oil
? source->source_channel_oil->oil_ref_count
: 0);
}
source_timer_off(group, source);
igmp_source_forward_stop(source);
source->source_channel_oil = NULL;
/* 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 interface %s",
__func__, source_str, group_str,
group->interface->name);
/* warning only */
}
/*
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 gm_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 gm_source *src;
for (ALL_LIST_ELEMENTS(source_list, src_node, src_nextnode, src))
if (!src->t_source_timer)
igmp_source_delete(src);
}
struct gm_source *igmp_find_source_by_addr(struct gm_group *group,
struct in_addr src_addr)
{
struct listnode *src_node;
struct gm_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 gm_source *igmp_get_source_by_addr(struct gm_group *group,
struct in_addr src_addr, bool *new)
{
struct gm_source *src;
if (new)
*new = false;
src = igmp_find_source_by_addr(group, src_addr);
if (src)
return src;
if (PIM_DEBUG_GM_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 interface %s",
source_str, group_str, group->interface->name);
}
src = XCALLOC(MTYPE_PIM_IGMP_GROUP_SOURCE, sizeof(*src));
if (new)
*new = true;
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 void allow(struct gm_sock *igmp, struct in_addr from,
struct in_addr group_addr, int num_sources,
struct in_addr *sources)
{
struct gm_source *source;
struct gm_group *group;
int i;
if (num_sources == 0) {
/*
RFC 3376: 3.1. Socket-State
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.
So, deleting the group present.
*/
group = find_group_by_addr(igmp, group_addr);
if (!group) {
return;
}
if (group->group_filtermode_isexcl) {
if (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(group, source);
}
} else {
igmp_group_delete(group);
}
return;
}
/* non-existent 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 = igmp_get_source_by_addr(group, *src_addr, NULL);
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(group, source);
} /* scan received sources */
}
void igmpv3_report_isin(struct gm_sock *igmp, struct in_addr from,
struct in_addr group_addr, int num_sources,
struct in_addr *sources)
{
on_trace(__func__, igmp->interface, from, group_addr, num_sources,
sources);
allow(igmp, from, group_addr, num_sources, sources);
}
static void isex_excl(struct gm_group *group, int num_sources,
struct in_addr *sources)
{
struct gm_source *source;
int i;
/* EXCLUDE mode */
assert(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;
bool new;
src_addr = sources + i;
/* E.2: lookup reported source from (A) in (X,Y) */
source = igmp_get_source_by_addr(group, *src_addr, &new);
if (!source)
continue;
if (!new) {
/* 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) */
assert(!source->t_source_timer); /* timer == 0 */
igmp_source_reset_gmi(group, source);
assert(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, 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 gm_group *group, int num_sources,
struct in_addr *sources)
{
int i;
/* INCLUDE mode */
assert(!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 gm_source *source;
struct in_addr *src_addr;
bool new;
src_addr = sources + i;
/* I.2: lookup reported source (B) */
source = igmp_get_source_by_addr(group, *src_addr, &new);
if (!source)
continue;
if (!new) {
/* 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)
*/
assert(!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 */
assert(group->group_filtermode_isexcl);
group_exclude_fwd_anysrc_ifempty(group);
}
void igmpv3_report_isex(struct gm_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 gm_group *group;
on_trace(__func__, ifp, from, group_addr, num_sources, sources);
if (pim_is_group_filtered(ifp->info, &group_addr))
return;
/* non-existent 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);
assert(group->group_filtermode_isexcl);
}
assert(group->group_filtermode_isexcl);
igmp_group_reset_gmi(group);
}
static void toin_incl(struct gm_group *group, int num_sources,
struct in_addr *sources)
{
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 gm_source *source;
struct in_addr *src_addr;
bool new;
src_addr = sources + i;
/* Lookup reported source (B) */
source = igmp_get_source_by_addr(group, *src_addr, &new);
if (!source)
continue;
if (!new) {
/* If found, clear SEND flag (A*B) */
IGMP_SOURCE_DONT_SEND(source->source_flags);
--num_sources_tosend;
}
/* (B)=GMI */
igmp_source_reset_gmi(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 gm_group *group, int num_sources,
struct in_addr *sources)
{
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 gm_source *source;
struct in_addr *src_addr;
bool new;
src_addr = sources + i;
/* Lookup reported source (A) */
source = igmp_get_source_by_addr(group, *src_addr, &new);
if (!source)
continue;
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;
}
/* (A)=GMI */
igmp_source_reset_gmi(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 gm_sock *igmp, struct in_addr from,
struct in_addr group_addr, int num_sources,
struct in_addr *sources)
{
struct interface *ifp = igmp->interface;
struct gm_group *group;
on_trace(__func__, 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-existent 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 gm_group *group, int num_sources,
struct in_addr *sources)
{
int num_sources_tosend = 0;
int i;
assert(!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 gm_source *source;
struct in_addr *src_addr;
bool new;
src_addr = sources + i;
/* Lookup reported source (B) */
source = igmp_get_source_by_addr(group, *src_addr, &new);
if (!new) {
/* 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;
}
} /* 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);
}
assert(group->group_filtermode_isexcl);
group_exclude_fwd_anysrc_ifempty(group);
}
static void toex_excl(struct gm_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 gm_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 gm_source *source;
struct in_addr *src_addr;
bool new;
src_addr = sources + i;
/* lookup reported source (A) in known sources (X,Y) */
source = igmp_get_source_by_addr(group, *src_addr, &new);
if (!source)
continue;
if (!new) {
/* 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;
assert(!source->t_source_timer); /* timer == 0 */
group_timer_msec = igmp_group_timer_remain_msec(group);
igmp_source_timer_on(group, source, group_timer_msec);
assert(source->t_source_timer); /* (A-X-Y) timer > 0 */
/* make sure source is created with DELETE flag unset */
assert(!IGMP_SOURCE_TEST_DELETE(source->source_flags));
}
/* make sure reported source has DELETE flag unset */
assert(!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 gm_sock *igmp, struct in_addr from,
struct in_addr group_addr, int num_sources,
struct in_addr *sources)
{
struct interface *ifp = igmp->interface;
struct gm_group *group;
on_trace(__func__, ifp, from, group_addr, num_sources, sources);
/* non-existent 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);
assert(group->group_filtermode_isexcl);
}
assert(group->group_filtermode_isexcl);
/* Group Timer=GMI */
igmp_group_reset_gmi(group);
}
void igmpv3_report_allow(struct gm_sock *igmp, struct in_addr from,
struct in_addr group_addr, int num_sources,
struct in_addr *sources)
{
on_trace(__func__, igmp->interface, from, group_addr, num_sources,
sources);
allow(igmp, from, group_addr, num_sources, sources);
}
static void igmp_send_query_group(struct gm_group *group, char *query_buf,
size_t query_buf_size, int num_sources,
int s_flag)
{
struct interface *ifp = group->interface;
struct pim_interface *pim_ifp = ifp->info;
struct gm_sock *igmp;
struct listnode *sock_node;
for (ALL_LIST_ELEMENTS_RO(pim_ifp->gm_socket_list, sock_node, igmp)) {
igmp_send_query(
pim_ifp->igmp_version, group, query_buf, query_buf_size,
num_sources, group->group_addr, group->group_addr,
pim_ifp->gm_specific_query_max_response_time_dsec,
s_flag, igmp);
}
}
/*
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 gm_group *group)
{
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;
pim_ifp = group->interface->info;
if (pim_ifp->igmp_version == 3) {
query_buf_size = PIM_IGMP_BUFSIZE_WRITE;
} else {
query_buf_size = IGMP_V12_MSG_SIZE;
}