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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
-
- $QuaggaId: $Format:%an, %ai, %h$ $
- */
- #include <zebra.h>
- #include "memory.h"
- #include "pimd.h"
- #include "pim_igmp.h"
- #include "pim_igmpv3.h"
- #include "pim_iface.h"
- #include "pim_sock.h"
- #include "pim_mroute.h"
- #include "pim_str.h"
- #include "pim_util.h"
- #include "pim_time.h"
- #include "pim_zebra.h"
- #define IGMP_GRP_REC_TYPE_MODE_IS_INCLUDE (1)
- #define IGMP_GRP_REC_TYPE_MODE_IS_EXCLUDE (2)
- #define IGMP_GRP_REC_TYPE_CHANGE_TO_INCLUDE_MODE (3)
- #define IGMP_GRP_REC_TYPE_CHANGE_TO_EXCLUDE_MODE (4)
- #define IGMP_GRP_REC_TYPE_ALLOW_NEW_SOURCES (5)
- #define IGMP_GRP_REC_TYPE_BLOCK_OLD_SOURCES (6)
- static void group_timer_off(struct igmp_group *group);
- static struct igmp_group *find_group_by_addr(struct igmp_sock *igmp,
- struct in_addr group_addr);
- static int igmp_sock_open(struct in_addr ifaddr, ifindex_t ifindex,
- uint32_t pim_options)
- {
- int fd;
- int join = 0;
- struct in_addr group;
- fd = pim_socket_mcast(IPPROTO_IGMP, ifaddr, 1 /* loop=true */);
- if (fd < 0)
- return -1;
- if (PIM_IF_TEST_IGMP_LISTEN_ALLROUTERS(pim_options)) {
- if (inet_aton(PIM_ALL_ROUTERS, &group)) {
- if (!pim_socket_join(fd, group, ifaddr, ifindex))
- ++join;
- }
- else {
- zlog_warn("%s %s: IGMP socket fd=%d interface %s: could not solve %s to group address: errno=%d: %s",
- __FILE__, __PRETTY_FUNCTION__, fd, inet_ntoa(ifaddr),
- PIM_ALL_ROUTERS, errno, safe_strerror(errno));
- }
- }
- /*
- IGMP routers periodically send IGMP general queries to AllSystems=224.0.0.1
- IGMP routers must receive general queries for querier election.
- */
- if (inet_aton(PIM_ALL_SYSTEMS, &group)) {
- if (!pim_socket_join(fd, group, ifaddr, ifindex))
- ++join;
- }
- else {
- zlog_warn("%s %s: IGMP socket fd=%d interface %s: could not solve %s to group address: errno=%d: %s",
- __FILE__, __PRETTY_FUNCTION__, fd, inet_ntoa(ifaddr),
- PIM_ALL_SYSTEMS, errno, safe_strerror(errno));
- }
- if (inet_aton(PIM_ALL_IGMP_ROUTERS, &group)) {
- if (!pim_socket_join(fd, group, ifaddr, ifindex)) {
- ++join;
- }
- }
- else {
- zlog_warn("%s %s: IGMP socket fd=%d interface %s: could not solve %s to group address: errno=%d: %s",
- __FILE__, __PRETTY_FUNCTION__, fd, inet_ntoa(ifaddr),
- PIM_ALL_IGMP_ROUTERS, errno, safe_strerror(errno));
- }
- if (!join) {
- zlog_err("IGMP socket fd=%d could not join any group on interface address %s",
- fd, inet_ntoa(ifaddr));
- close(fd);
- fd = -1;
- }
- return fd;
- }
- #undef IGMP_SOCK_DUMP
- #ifdef IGMP_SOCK_DUMP
- static void igmp_sock_dump(array_t *igmp_sock_array)
- {
- int size = array_size(igmp_sock_array);
- int i;
-
- for (i = 0; i < size; ++i) {
-
- struct igmp_sock *igmp = array_get(igmp_sock_array, i);
-
- zlog_debug("%s %s: [%d/%d] igmp_addr=%s fd=%d",
- __FILE__, __PRETTY_FUNCTION__,
- i, size,
- inet_ntoa(igmp->ifaddr),
- igmp->fd);
- }
- }
- #endif
- struct igmp_sock *pim_igmp_sock_lookup_ifaddr(struct list *igmp_sock_list,
- struct in_addr ifaddr)
- {
- struct listnode *sock_node;
- struct igmp_sock *igmp;
- #ifdef IGMP_SOCK_DUMP
- igmp_sock_dump(igmp_sock_list);
- #endif
- for (ALL_LIST_ELEMENTS_RO(igmp_sock_list, sock_node, igmp))
- if (ifaddr.s_addr == igmp->ifaddr.s_addr)
- return igmp;
- return 0;
- }
- struct igmp_sock *igmp_sock_lookup_by_fd(struct list *igmp_sock_list,
- int fd)
- {
- struct listnode *sock_node;
- struct igmp_sock *igmp;
- for (ALL_LIST_ELEMENTS_RO(igmp_sock_list, sock_node, igmp))
- if (fd == igmp->fd)
- return igmp;
- return 0;
- }
- static int pim_igmp_other_querier_expire(struct thread *t)
- {
- struct igmp_sock *igmp;
- zassert(t);
- igmp = THREAD_ARG(t);
- zassert(igmp);
- zassert(igmp->t_other_querier_timer);
- zassert(!igmp->t_igmp_query_timer);
- if (PIM_DEBUG_IGMP_TRACE) {
- char ifaddr_str[100];
- pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str));
- zlog_debug("%s: Querier %s resuming",
- __PRETTY_FUNCTION__,
- ifaddr_str);
- }
- igmp->t_other_querier_timer = 0;
- /*
- We are the current querier, then
- re-start sending general queries.
- */
- pim_igmp_general_query_on(igmp);
- return 0;
- }
- void pim_igmp_other_querier_timer_on(struct igmp_sock *igmp)
- {
- long other_querier_present_interval_msec;
- struct pim_interface *pim_ifp;
- zassert(igmp);
- zassert(igmp->interface);
- zassert(igmp->interface->info);
- pim_ifp = igmp->interface->info;
- if (igmp->t_other_querier_timer) {
- /*
- There is other querier present already,
- then reset the other-querier-present timer.
- */
- if (PIM_DEBUG_IGMP_TRACE) {
- char ifaddr_str[100];
- pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str));
- zlog_debug("Querier %s resetting TIMER event for Other-Querier-Present",
- ifaddr_str);
- }
- THREAD_OFF(igmp->t_other_querier_timer);
- zassert(!igmp->t_other_querier_timer);
- }
- else {
- /*
- We are the current querier, then stop sending general queries:
- igmp->t_igmp_query_timer = 0;
- */
- pim_igmp_general_query_off(igmp);
- }
- /*
- Since this socket is starting the other-querier-present timer,
- there should not be periodic query timer for this socket.
- */
- zassert(!igmp->t_igmp_query_timer);
- /*
- RFC 3376: 8.5. Other Querier Present Interval
- The Other Querier Present Interval is the length of time that must
- pass before a multicast router decides that there is no longer
- another multicast router which should be the querier. This value
- MUST be ((the Robustness Variable) times (the Query Interval)) plus
- (one half of one Query Response Interval).
- other_querier_present_interval_msec = \
- igmp->querier_robustness_variable * \
- 1000 * igmp->querier_query_interval + \
- 100 * (pim_ifp->query_max_response_time_dsec >> 1);
- */
- other_querier_present_interval_msec =
- PIM_IGMP_OQPI_MSEC(igmp->querier_robustness_variable,
- igmp->querier_query_interval,
- pim_ifp->igmp_query_max_response_time_dsec);
-
- if (PIM_DEBUG_IGMP_TRACE) {
- char ifaddr_str[100];
- pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str));
- zlog_debug("Querier %s scheduling %ld.%03ld sec TIMER event for Other-Querier-Present",
- ifaddr_str,
- other_querier_present_interval_msec / 1000,
- other_querier_present_interval_msec % 1000);
- }
-
- THREAD_TIMER_MSEC_ON(master, igmp->t_other_querier_timer,
- pim_igmp_other_querier_expire,
- igmp, other_querier_present_interval_msec);
- }
- void pim_igmp_other_querier_timer_off(struct igmp_sock *igmp)
- {
- zassert(igmp);
- if (PIM_DEBUG_IGMP_TRACE) {
- if (igmp->t_other_querier_timer) {
- char ifaddr_str[100];
- pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str));
- zlog_debug("IGMP querier %s fd=%d cancelling other-querier-present TIMER event on %s",
- ifaddr_str, igmp->fd, igmp->interface->name);
- }
- }
- THREAD_OFF(igmp->t_other_querier_timer);
- zassert(!igmp->t_other_querier_timer);
- }
- static int recv_igmp_query(struct igmp_sock *igmp, int query_version,
- int max_resp_code,
- struct in_addr from, const char *from_str,
- char *igmp_msg, int igmp_msg_len)
- {
- struct interface *ifp;
- struct pim_interface *pim_ifp;
- uint8_t resv_s_qrv = 0;
- uint8_t s_flag = 0;
- uint8_t qrv = 0;
- struct in_addr group_addr;
- uint16_t recv_checksum;
- uint16_t checksum;
- int i;
- //group_addr = *(struct in_addr *)(igmp_msg + 4);
- memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr));
- ifp = igmp->interface;
- pim_ifp = ifp->info;
- recv_checksum = *(uint16_t *) (igmp_msg + IGMP_V3_CHECKSUM_OFFSET);
- /* for computing checksum */
- *(uint16_t *) (igmp_msg + IGMP_V3_CHECKSUM_OFFSET) = 0;
- checksum = in_cksum(igmp_msg, igmp_msg_len);
- if (checksum != recv_checksum) {
- zlog_warn("Recv IGMP query v%d from %s on %s: checksum mismatch: received=%x computed=%x",
- query_version, from_str, ifp->name, recv_checksum, checksum);
- return -1;
- }
- if (PIM_DEBUG_IGMP_PACKETS) {
- char group_str[100];
- pim_inet4_dump("<group?>", group_addr, group_str, sizeof(group_str));
- zlog_debug("Recv IGMP query v%d from %s on %s: size=%d checksum=%x group=%s",
- query_version, from_str, ifp->name,
- igmp_msg_len, checksum, group_str);
- }
- /*
- RFC 3376: 6.6.2. Querier Election
- When a router receives a query with a lower IP address, it sets
- the Other-Querier-Present timer to Other Querier Present Interval
- and ceases to send queries on the network if it was the previously
- elected querier.
- */
- if (ntohl(from.s_addr) < ntohl(igmp->ifaddr.s_addr)) {
-
- if (PIM_DEBUG_IGMP_TRACE) {
- char ifaddr_str[100];
- pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str));
- zlog_debug("%s: local address %s (%u) lost querier election to %s (%u)",
- ifp->name,
- ifaddr_str, ntohl(igmp->ifaddr.s_addr),
- from_str, ntohl(from.s_addr));
- }
- pim_igmp_other_querier_timer_on(igmp);
- }
- if (query_version == 3) {
- /*
- RFC 3376: 4.1.6. QRV (Querier's Robustness Variable)
- Routers adopt the QRV value from the most recently received Query
- as their own [Robustness Variable] value, unless that most
- recently received QRV was zero, in which case the receivers use
- the default [Robustness Variable] value specified in section 8.1
- or a statically configured value.
- */
- resv_s_qrv = igmp_msg[8];
- qrv = 7 & resv_s_qrv;
- igmp->querier_robustness_variable = qrv ? qrv : pim_ifp->igmp_default_robustness_variable;
- }
- /*
- RFC 3376: 4.1.7. QQIC (Querier's Query Interval Code)
- Multicast routers that are not the current querier adopt the QQI
- value from the most recently received Query as their own [Query
- Interval] value, unless that most recently received QQI was zero,
- in which case the receiving routers use the default.
- */
- if (igmp->t_other_querier_timer && query_version == 3) {
- /* other querier present */
- uint8_t qqic;
- uint16_t qqi;
- qqic = igmp_msg[9];
- qqi = igmp_msg_decode8to16(qqic);
- igmp->querier_query_interval = qqi ? qqi : pim_ifp->igmp_default_query_interval;
- if (PIM_DEBUG_IGMP_TRACE) {
- char ifaddr_str[100];
- pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str));
- zlog_debug("Querier %s new query interval is %s QQI=%u sec (recv QQIC=%02x from %s)",
- ifaddr_str,
- qqi ? "recv-non-default" : "default",
- igmp->querier_query_interval,
- qqic,
- from_str);
- }
- }
- /*
- RFC 3376: 6.6.1. Timer Updates
- When a router sends or receives a query with a clear Suppress
- Router-Side Processing flag, it must update its timers to reflect
- the correct timeout values for the group or sources being queried.
- General queries don't trigger timer update.
- */
- if (query_version == 3) {
- s_flag = (1 << 3) & resv_s_qrv;
- }
- else {
- /* Neither V1 nor V2 have this field. Pimd should really go into
- * a compatibility mode here and run as V2 (or V1) but it doesn't
- * so for now, lets just set the flag to suppress these timer updates.
- */
- s_flag = 1;
- }
-
- if (!s_flag) {
- /* s_flag is clear */
- if (PIM_INADDR_IS_ANY(group_addr)) {
- /* this is a general query */
- /* log that general query should have the s_flag set */
- zlog_warn("General IGMP query v%d from %s on %s: Suppress Router-Side Processing flag is clear",
- query_version, from_str, ifp->name);
- }
- else {
- struct igmp_group *group;
- /* this is a non-general query: perform timer updates */
- group = find_group_by_addr(igmp, group_addr);
- if (group) {
- int recv_num_sources = ntohs(*(uint16_t *)(igmp_msg + IGMP_V3_NUMSOURCES_OFFSET));
- /*
- RFC 3376: 6.6.1. Timer Updates
- Query Q(G,A): Source Timer for sources in A are lowered to LMQT
- Query Q(G): Group Timer is lowered to LMQT
- */
- if (recv_num_sources < 1) {
- /* Query Q(G): Group Timer is lowered to LMQT */
- igmp_group_timer_lower_to_lmqt(group);
- }
- else {
- /* Query Q(G,A): Source Timer for sources in A are lowered to LMQT */
- /* Scan sources in query and lower their timers to LMQT */
- struct in_addr *sources = (struct in_addr *)(igmp_msg + IGMP_V3_SOURCES_OFFSET);
- for (i = 0; i < recv_num_sources; ++i) {
- //struct in_addr src_addr = sources[i];
- //struct igmp_source *src = igmp_find_source_by_addr(group, src_addr);
- struct in_addr src_addr;
- struct igmp_source *src;
- memcpy(&src_addr, sources + i, sizeof(struct in_addr));
- src = igmp_find_source_by_addr(group, src_addr);
- if (src) {
- igmp_source_timer_lower_to_lmqt(src);
- }
- }
- }
- }
- else {
- char group_str[100];
- pim_inet4_dump("<group?>", group_addr, group_str, sizeof(group_str));
- zlog_warn("IGMP query v%d from %s on %s: could not find group %s for timer update",
- query_version, from_str, ifp->name, group_str);
- }
- }
- } /* s_flag is clear: timer updates */
-
- return 0;
- }
- static int igmp_v3_report(struct igmp_sock *igmp,
- struct in_addr from, const char *from_str,
- char *igmp_msg, int igmp_msg_len)
- {
- uint16_t recv_checksum;
- uint16_t checksum;
- int num_groups;
- uint8_t *group_record;
- uint8_t *report_pastend = (uint8_t *) igmp_msg + igmp_msg_len;
- struct interface *ifp = igmp->interface;
- int i;
- if (igmp_msg_len < IGMP_V3_MSG_MIN_SIZE) {
- zlog_warn("Recv IGMP report v3 from %s on %s: size=%d shorter than minimum=%d",
- from_str, ifp->name, igmp_msg_len, IGMP_V3_MSG_MIN_SIZE);
- return -1;
- }
- recv_checksum = *(uint16_t *) (igmp_msg + IGMP_V3_CHECKSUM_OFFSET);
- /* for computing checksum */
- *(uint16_t *) (igmp_msg + IGMP_V3_CHECKSUM_OFFSET) = 0;
- checksum = in_cksum(igmp_msg, igmp_msg_len);
- if (checksum != recv_checksum) {
- zlog_warn("Recv IGMP report v3 from %s on %s: checksum mismatch: received=%x computed=%x",
- from_str, ifp->name, recv_checksum, checksum);
- return -1;
- }
- num_groups = ntohs(*(uint16_t *) (igmp_msg + IGMP_V3_REPORT_NUMGROUPS_OFFSET));
- if (num_groups < 1) {
- zlog_warn("Recv IGMP report v3 from %s on %s: missing group records",
- from_str, ifp->name);
- return -1;
- }
- if (PIM_DEBUG_IGMP_PACKETS) {
- zlog_debug("Recv IGMP report v3 from %s on %s: size=%d checksum=%x groups=%d",
- from_str, ifp->name, igmp_msg_len, checksum, num_groups);
- }
- group_record = (uint8_t *) igmp_msg + IGMP_V3_REPORT_GROUPPRECORD_OFFSET;
- /* Scan groups */
- for (i = 0; i < num_groups; ++i) {
- struct in_addr rec_group;
- uint8_t *sources;
- uint8_t *src;
- int rec_type;
- int rec_auxdatalen;
- int rec_num_sources;
- int j;
- if ((group_record + IGMP_V3_GROUP_RECORD_MIN_SIZE) > report_pastend) {
- zlog_warn("Recv IGMP report v3 from %s on %s: group record beyond report end",
- from_str, ifp->name);
- return -1;
- }
- rec_type = group_record[IGMP_V3_GROUP_RECORD_TYPE_OFFSET];
- rec_auxdatalen = group_record[IGMP_V3_GROUP_RECORD_AUXDATALEN_OFFSET];
- rec_num_sources = ntohs(* (uint16_t *) (group_record + IGMP_V3_GROUP_RECORD_NUMSOURCES_OFFSET));
- //rec_group = *(struct in_addr *)(group_record + IGMP_V3_GROUP_RECORD_GROUP_OFFSET);
- memcpy(&rec_group, group_record + IGMP_V3_GROUP_RECORD_GROUP_OFFSET, sizeof(struct in_addr));
- if (PIM_DEBUG_IGMP_PACKETS) {
- zlog_debug("Recv IGMP report v3 from %s on %s: record=%d type=%d auxdatalen=%d sources=%d group=%s",
- from_str, ifp->name, i, rec_type, rec_auxdatalen, rec_num_sources, inet_ntoa(rec_group));
- }
- /* Scan sources */
-
- sources = group_record + IGMP_V3_GROUP_RECORD_SOURCE_OFFSET;
- for (j = 0, src = sources; j < rec_num_sources; ++j, src += 4) {
- if ((src + 4) > report_pastend) {
- zlog_warn("Recv IGMP report v3 from %s on %s: group source beyond report end",
- from_str, ifp->name);
- return -1;
- }
- if (PIM_DEBUG_IGMP_PACKETS) {
- char src_str[200];
- if (!inet_ntop(AF_INET, src, src_str , sizeof(src_str)))
- sprintf(src_str, "<source?>");
-
- zlog_debug("Recv IGMP report v3 from %s on %s: record=%d group=%s source=%s",
- from_str, ifp->name, i, inet_ntoa(rec_group), src_str);
- }
- } /* for (sources) */
- switch (rec_type) {
- case IGMP_GRP_REC_TYPE_MODE_IS_INCLUDE:
- igmpv3_report_isin(igmp, from, rec_group, rec_num_sources, (struct in_addr *) sources);
- break;
- case IGMP_GRP_REC_TYPE_MODE_IS_EXCLUDE:
- igmpv3_report_isex(igmp, from, rec_group, rec_num_sources, (struct in_addr *) sources);
- break;
- case IGMP_GRP_REC_TYPE_CHANGE_TO_INCLUDE_MODE:
- igmpv3_report_toin(igmp, from, rec_group, rec_num_sources, (struct in_addr *) sources);
- break;
- case IGMP_GRP_REC_TYPE_CHANGE_TO_EXCLUDE_MODE:
- igmpv3_report_toex(igmp, from, rec_group, rec_num_sources, (struct in_addr *) sources);
- break;
- case IGMP_GRP_REC_TYPE_ALLOW_NEW_SOURCES:
- igmpv3_report_allow(igmp, from, rec_group, rec_num_sources, (struct in_addr *) sources);
- break;
- case IGMP_GRP_REC_TYPE_BLOCK_OLD_SOURCES:
- igmpv3_report_block(igmp, from, rec_group, rec_num_sources, (struct in_addr *) sources);
- break;
- default:
- zlog_warn("Recv IGMP report v3 from %s on %s: unknown record type: type=%d",
- from_str, ifp->name, rec_type);
- }
- group_record += 8 + (rec_num_sources << 2) + (rec_auxdatalen << 2);
- } /* for (group records) */
- return 0;
- }
- 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);
- }
- }
- static int igmp_v2_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 igmp_group *group;
- struct in_addr group_addr;
- on_trace(__PRETTY_FUNCTION__, igmp->interface, from);
- if (igmp_msg_len != IGMP_V12_MSG_SIZE) {
- zlog_warn("Recv IGMP report v2 from %s on %s: size=%d other than correct=%d",
- from_str, ifp->name, igmp_msg_len, IGMP_V12_MSG_SIZE);
- return -1;
- }
- if (PIM_DEBUG_IGMP_TRACE) {
- zlog_warn("%s %s: FIXME WRITEME",
- __FILE__, __PRETTY_FUNCTION__);
- }
- //group_addr = *(struct in_addr *)(igmp_msg + 4);
- memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr));
- /* non-existant group is created as INCLUDE {empty} */
- group = igmp_add_group_by_addr(igmp, group_addr);
- if (!group) {
- return -1;
- }
- group->last_igmp_v2_report_dsec = pim_time_monotonic_dsec();
- return 0;
- }
- static int igmp_v2_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;
- on_trace(__PRETTY_FUNCTION__, igmp->interface, from);
- if (igmp_msg_len != IGMP_V12_MSG_SIZE) {
- zlog_warn("Recv IGMP leave v2 from %s on %s: size=%d other than correct=%d",
- from_str, ifp->name, igmp_msg_len, IGMP_V12_MSG_SIZE);
- return -1;
- }
- if (PIM_DEBUG_IGMP_TRACE) {
- zlog_warn("%s %s: FIXME WRITEME",
- __FILE__, __PRETTY_FUNCTION__);
- }
- return 0;
- }
- static int igmp_v1_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 igmp_group *group;
- struct in_addr group_addr;
- on_trace(__PRETTY_FUNCTION__, igmp->interface, from);
- if (igmp_msg_len != IGMP_V12_MSG_SIZE) {
- zlog_warn("Recv IGMP report v1 from %s on %s: size=%d other than correct=%d",
- from_str, ifp->name, igmp_msg_len, IGMP_V12_MSG_SIZE);
- return -1;
- }
- if (PIM_DEBUG_IGMP_TRACE) {
- zlog_warn("%s %s: FIXME WRITEME",
- __FILE__, __PRETTY_FUNCTION__);
- }
- //group_addr = *(struct in_addr *)(igmp_msg + 4);
- memcpy(&group_addr, igmp_msg + 4, sizeof(struct in_addr));
- /* non-existant group is created as INCLUDE {empty} */
- group = igmp_add_group_by_addr(igmp, group_addr);
- if (!group) {
- return -1;
- }
- group->last_igmp_v1_report_dsec = pim_time_monotonic_dsec();
- return 0;
- }
- int pim_igmp_packet(struct igmp_sock *igmp, char *buf, size_t len)
- {
- struct ip *ip_hdr;
- size_t ip_hlen; /* ip header length in bytes */
- char *igmp_msg;
- int igmp_msg_len;
- int msg_type;
- char from_str[100];
- char to_str[100];
-
- if (len < sizeof(*ip_hdr)) {
- zlog_warn("IGMP packet size=%zu shorter than minimum=%zu",
- len, sizeof(*ip_hdr));
- return -1;
- }
- ip_hdr = (struct ip *) buf;
- pim_inet4_dump("<src?>", ip_hdr->ip_src, from_str , sizeof(from_str));
- pim_inet4_dump("<dst?>", ip_hdr->ip_dst, to_str , sizeof(to_str));
- ip_hlen = ip_hdr->ip_hl << 2; /* ip_hl gives length in 4-byte words */
- if (PIM_DEBUG_IGMP_PACKETS) {
- zlog_debug("Recv IP packet from %s to %s on %s: size=%zu ip_header_size=%zu ip_proto=%d",
- from_str, to_str, igmp->interface->name, len, ip_hlen, ip_hdr->ip_p);
- }
- if (ip_hdr->ip_p != PIM_IP_PROTO_IGMP) {
- zlog_warn("IP packet protocol=%d is not IGMP=%d",
- ip_hdr->ip_p, PIM_IP_PROTO_IGMP);
- return -1;
- }
- if (ip_hlen < PIM_IP_HEADER_MIN_LEN) {
- zlog_warn("IP packet header size=%zu shorter than minimum=%d",
- ip_hlen, PIM_IP_HEADER_MIN_LEN);
- return -1;
- }
- if (ip_hlen > PIM_IP_HEADER_MAX_LEN) {
- zlog_warn("IP packet header size=%zu greater than maximum=%d",
- ip_hlen, PIM_IP_HEADER_MAX_LEN);
- return -1;
- }
- igmp_msg = buf + ip_hlen;
- msg_type = *igmp_msg;
- igmp_msg_len = len - ip_hlen;
- if (PIM_DEBUG_IGMP_PACKETS) {
- zlog_debug("Recv IGMP packet from %s to %s on %s: ttl=%d msg_type=%d msg_size=%d",
- from_str, to_str, igmp->interface->name, ip_hdr->ip_ttl, msg_type,
- igmp_msg_len);
- }
- if (igmp_msg_len < PIM_IGMP_MIN_LEN) {
- zlog_warn("IGMP message size=%d shorter than minimum=%d",
- igmp_msg_len, PIM_IGMP_MIN_LEN);
- return -1;
- }
- switch (msg_type) {
- case PIM_IGMP_MEMBERSHIP_QUERY:
- {
- int max_resp_code = igmp_msg[1];
- int query_version;
- /*
- RFC 3376: 7.1. Query Version Distinctions
- IGMPv1 Query: length = 8 octets AND Max Resp Code field is zero
- IGMPv2 Query: length = 8 octets AND Max Resp Code field is non-zero
- IGMPv3 Query: length >= 12 octets
- */
- if (igmp_msg_len == 8) {
- query_version = max_resp_code ? 2 : 1;
- }
- else if (igmp_msg_len >= 12) {
- query_version = 3;
- }
- else {
- zlog_warn("Unknown IGMP query version");
- return -1;
- }
- return recv_igmp_query(igmp, query_version, max_resp_code,
- ip_hdr->ip_src, from_str,
- igmp_msg, igmp_msg_len);
- }
- case PIM_IGMP_V3_MEMBERSHIP_REPORT:
- return igmp_v3_report(igmp, ip_hdr->ip_src, from_str,
- igmp_msg, igmp_msg_len);
- case PIM_IGMP_V2_MEMBERSHIP_REPORT:
- return igmp_v2_report(igmp, ip_hdr->ip_src, from_str,
- igmp_msg, igmp_msg_len);
- case PIM_IGMP_V1_MEMBERSHIP_REPORT:
- return igmp_v1_report(igmp, ip_hdr->ip_src, from_str,
- igmp_msg, igmp_msg_len);
- case PIM_IGMP_V2_LEAVE_GROUP:
- return igmp_v2_leave(igmp, ip_hdr->ip_src, from_str,
- igmp_msg, igmp_msg_len);
- }
- zlog_warn("Ignoring unsupported IGMP message type: %d", msg_type);
- return -1;
- }
- static int pim_igmp_general_query(struct thread *t);
- void pim_igmp_general_query_on(struct igmp_sock *igmp)
- {
- struct pim_interface *pim_ifp;
- int startup_mode;
- int query_interval;
- zassert(igmp);
- zassert(igmp->interface);
- /*
- Since this socket is starting as querier,
- there should not exist a timer for other-querier-present.
- */
- zassert(!igmp->t_other_querier_timer);
- pim_ifp = igmp->interface->info;
- zassert(pim_ifp);
- /*
- RFC 3376: 8.6. Startup Query Interval
- The Startup Query Interval is the interval between General Queries
- sent by a Querier on startup. Default: 1/4 the Query Interval.
- */
- startup_mode = igmp->startup_query_count > 0;
- if (startup_mode) {
- --igmp->startup_query_count;
- /* query_interval = pim_ifp->igmp_default_query_interval >> 2; */
- query_interval = PIM_IGMP_SQI(pim_ifp->igmp_default_query_interval);
- }
- else {
- query_interval = igmp->querier_query_interval;
- }
- if (PIM_DEBUG_IGMP_TRACE) {
- char ifaddr_str[100];
- pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str));
- zlog_debug("Querier %s scheduling %d-second (%s) TIMER event for IGMP query on fd=%d",
- ifaddr_str,
- query_interval,
- startup_mode ? "startup" : "non-startup",
- igmp->fd);
- }
- igmp->t_igmp_query_timer = 0;
- zassert(!igmp->t_igmp_query_timer);
- THREAD_TIMER_ON(master, igmp->t_igmp_query_timer,
- pim_igmp_general_query,
- igmp, query_interval);
- }
- void pim_igmp_general_query_off(struct igmp_sock *igmp)
- {
- zassert(igmp);
- if (PIM_DEBUG_IGMP_TRACE) {
- if (igmp->t_igmp_query_timer) {
- char ifaddr_str[100];
- pim_inet4_dump("<ifaddr?>", igmp->ifaddr, ifaddr_str, sizeof(ifaddr_str));
- zlog_debug("IGMP querier %s fd=%d cancelling query TIMER event on %s",
- ifaddr_str, igmp->fd, igmp->interface->name);
- }
- }
- THREAD_OFF(igmp->t_igmp_query_timer);
- zassert(!igmp->t_igmp_query_timer);
- }
- /* Issue IGMP general query */
- static int pim_igmp_general_query(struct thread *t)
- {
- char query_buf[PIM_IGMP_BUFSIZE_WRITE];
- struct igmp_sock *igmp;
- struct in_addr dst_addr;
- struct in_addr group_addr;
- struct pim_interface *pim_ifp;
- zassert(t);
- igmp = THREAD_ARG(t);
- zassert(igmp);
- zassert(igmp->interface);
- zassert(igmp->interface->info);
- pim_ifp = igmp->interface->info;
- /*
- RFC3376: 4.1.12. IP Destination Addresses for Queries
- In IGMPv3, General Queries are sent with an IP destination address
- of 224.0.0.1, the all-systems multicast address. Group-Specific
- and Group-and-Source-Specific Queries are sent with an IP
- destination address equal to the multicast address of interest.
- */
- dst_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
- group_addr.s_addr = PIM_NET_INADDR_ANY;
- if (PIM_DEBUG_IGMP_TRACE) {
- char querier_str[100];
- char dst_str[100];
- pim_inet4_dump("<querier?>", igmp->ifaddr, querier_str,
- sizeof(querier_str));
- pim_inet4_dump("<dst?>", dst_addr, dst_str, sizeof(dst_str));
- zlog_debug("Querier %s issuing IGMP general query to %s on %s",
- querier_str, dst_str, igmp->interface->name);
- }
- pim_igmp_send_membership_query(0 /* igmp_group */,
- igmp->fd,
- igmp->interface->name,
- query_buf,
- sizeof(query_buf),
- 0 /* num_sources */,
- dst_addr,
- group_addr,
- pim_ifp->igmp_query_max_response_time_dsec,
- 1 /* s_flag: always set for general queries */,
- igmp->querier_robustness_variable,
- igmp->querier_query_interval);
- pim_igmp_general_query_on(igmp);
- return 0;
- }
- static int pim_igmp_read(struct thread *t);
- static void igmp_read_on(struct igmp_sock *igmp)
- {
- zassert(igmp);
- if (PIM_DEBUG_IGMP_TRACE) {
- zlog_debug("Scheduling READ event on IGMP socket fd=%d",
- igmp->fd);
- }
- igmp->t_igmp_read = 0;
- zassert(!igmp->t_igmp_read);
- THREAD_READ_ON(master, igmp->t_igmp_read, pim_igmp_read, igmp, igmp->fd);
- }
- static int pim_igmp_read(struct thread *t)
- {
- struct igmp_sock *igmp;
- int fd;
- struct sockaddr_in from;
- struct sockaddr_in to;
- socklen_t fromlen = sizeof(from);
- socklen_t tolen = sizeof(to);
- uint8_t buf[PIM_IGMP_BUFSIZE_READ];
- int len;
- ifindex_t ifindex = -1;
- int result = -1; /* defaults to bad */
- zassert(t);
- igmp = THREAD_ARG(t);
- zassert(igmp);
- fd = THREAD_FD(t);
- zassert(fd == igmp->fd);
- len = pim_socket_recvfromto(fd, buf, sizeof(buf),
- &from, &fromlen,
- &to, &tolen,
- &ifindex);
- if (len < 0) {
- zlog_warn("Failure receiving IP IGMP packet on fd=%d: errno=%d: %s",
- fd, errno, safe_strerror(errno));
- goto done;
- }
- if (PIM_DEBUG_IGMP_PACKETS) {
- char from_str[100];
- char to_str[100];
-
- if (!inet_ntop(AF_INET, &from.sin_addr, from_str, sizeof(from_str)))
- sprintf(from_str, "<from?>");
- if (!inet_ntop(AF_INET, &to.sin_addr, to_str, sizeof(to_str)))
- sprintf(to_str, "<to?>");
-
- zlog_debug("Recv IP IGMP pkt size=%d from %s to %s on fd=%d on ifindex=%d (sock_ifindex=%d)",
- len, from_str, to_str, fd, ifindex, igmp->interface->ifindex);
- }
- #ifdef PIM_CHECK_RECV_IFINDEX_SANITY
- /* ifindex sanity check */
- if (ifindex != (int) igmp->interface->ifindex) {
- char from_str[100];
- char to_str[100];
- struct interface *ifp;
- if (!inet_ntop(AF_INET, &from.sin_addr, from_str , sizeof(from_str)))
- sprintf(from_str, "<from?>");
- if (!inet_ntop(AF_INET, &to.sin_addr, to_str , sizeof(to_str)))
- sprintf(to_str, "<to?>");
- ifp = if_lookup_by_index(ifindex);
- if (ifp) {
- zassert(ifindex == (int) ifp->ifindex);
- }
- #ifdef PIM_REPORT_RECV_IFINDEX_MISMATCH
- zlog_warn("Interface mismatch: recv IGMP pkt from %s to %s on fd=%d: recv_ifindex=%d (%s) sock_ifindex=%d (%s)",
- from_str, to_str, fd,
- ifindex, ifp ? ifp->name : "<if-notfound>",
- igmp->interface->ifindex, igmp->interface->name);
- #endif
- goto done;
- }
- #endif
- if (pim_igmp_packet(igmp, (char *)buf, len)) {
- goto done;
- }
- result = 0; /* good */
- done:
- igmp_read_on(igmp);
- return result;
- }
- static void sock_close(struct igmp_sock *igmp)
- {
- pim_igmp_other_querier_timer_off(igmp);
- pim_igmp_general_query_off(igmp);
- if (PIM_DEBUG_IGMP_TRACE) {
- if (igmp->t_igmp_read) {
- zlog_debug("Cancelling READ event on IGMP socket %s fd=%d on interface %s",
- inet_ntoa(igmp->ifaddr), igmp->fd,
- igmp->interface->name);
- }
- }
- THREAD_OFF(igmp->t_igmp_read);
- zassert(!igmp->t_igmp_read);
-
- if (close(igmp->fd)) {
- zlog_err("Failure closing IGMP socket %s fd=%d on interface %s: errno=%d: %s",
- inet_ntoa(igmp->ifaddr), igmp->fd, igmp->interface->name,
- errno, safe_strerror(errno));
- }
-
- if (PIM_DEBUG_IGMP_TRACE) {
- zlog_debug("Deleted IGMP socket %s fd=%d on interface %s",
- inet_ntoa(igmp->ifaddr), igmp->fd, igmp->interface->name);
- }
- }
- void igmp_startup_mode_on(struct igmp_sock *igmp)
- {
- struct pim_interface *pim_ifp;
- pim_ifp = igmp->interface->info;
- /*
- RFC 3376: 8.7. Startup Query Count
- The Startup Query Count is the number of Queries sent out on
- startup, separated by the Startup Query Interval. Default: the
- Robustness Variable.
- */
- igmp->startup_query_count = igmp->querier_robustness_variable;
- /*
- Since we're (re)starting, reset QQI to default Query Interval
- */
- igmp->querier_query_interval = pim_ifp->igmp_default_query_interval;
- }
- static void igmp_group_free(struct igmp_group *group)
- {
- zassert(!group->t_group_query_retransmit_timer);
- zassert(!group->t_group_timer);
- zassert(group->group_source_list);
- zassert(!listcount(group->group_source_list));
- list_free(group->group_source_list);
- XFREE(MTYPE_PIM_IGMP_GROUP, group);
- }
- static void igmp_group_delete(struct igmp_group *group)
- {
- struct listnode *src_node;
- struct listnode *src_nextnode;
- struct igmp_source *src;
- if (PIM_DEBUG_IGMP_TRACE) {
- char group_str[100];
- pim_inet4_dump("<group?>", group->group_addr, group_str, sizeof(group_str));
- zlog_debug("Deleting IGMP group %s from socket %d interface %s",
- group_str,
- group->group_igmp_sock->fd,
- group->group_igmp_sock->interface->name);
- }
- for (ALL_LIST_ELEMENTS(group->group_source_list, src_node, src_nextnode, src)) {
- igmp_source_delete(src);
- }
- if (group->t_group_query_retransmit_timer) {
- THREAD_OFF(group->t_group_query_retransmit_timer);
- zassert(!group->t_group_query_retransmit_timer);
- }
- group_timer_off(group);
- listnode_delete(group->group_igmp_sock->igmp_group_list, group);
- igmp_group_free(group);
- }
- void igmp_group_delete_empty_include(struct igmp_group *group)
- {
- zassert(!group->group_filtermode_isexcl);
- zassert(!listcount(group->group_source_list));
- igmp_group_delete(group);
- }
- void igmp_sock_free(struct igmp_sock *igmp)
- {
- zassert(!igmp->t_igmp_read);
- zassert(!igmp->t_igmp_query_timer);
- zassert(!igmp->t_other_querier_timer);
- zassert(igmp->igmp_group_list);
- zassert(!listcount(igmp->igmp_group_list));
- list_free(igmp->igmp_group_list);
- XFREE(MTYPE_PIM_IGMP_SOCKET, igmp);
- }
- void igmp_sock_delete(struct igmp_sock *igmp)
- {
- struct pim_interface *pim_ifp;
- struct listnode *grp_node;
- struct listnode *grp_nextnode;
- struct igmp_group *grp;
- for (ALL_LIST_ELEMENTS(igmp->igmp_group_list, grp_node, grp_nextnode, grp)) {
- igmp_group_delete(grp);
- }
- sock_close(igmp);
- pim_ifp = igmp->interface->info;
- listnode_delete(pim_ifp->igmp_socket_list, igmp);
- igmp_sock_free(igmp);
- }
- static struct igmp_sock *igmp_sock_new(int fd,
- struct in_addr ifaddr,
- struct interface *ifp)
- {
- struct pim_interface *pim_ifp;
- struct igmp_sock *igmp;
- pim_ifp = ifp->info;
- if (PIM_DEBUG_IGMP_TRACE) {
- zlog_debug("Creating IGMP socket fd=%d for address %s on interface %s",
- fd, inet_ntoa(ifaddr), ifp->name);
- }
- igmp = XMALLOC(MTYPE_PIM_IGMP_SOCKET, sizeof(*igmp));
- if (!igmp) {
- zlog_warn("%s %s: XMALLOC() failure",
- __FILE__, __PRETTY_FUNCTION__);
- return 0;
- }
- igmp->igmp_group_list = list_new();
- if (!igmp->igmp_group_list) {
- zlog_err("%s %s: failure: igmp_group_list = list_new()",
- __FILE__, __PRETTY_FUNCTION__);
- return 0;
- }
- igmp->igmp_group_list->del = (void (*)(void *)) igmp_group_free;
- igmp->fd = fd;
- igmp->interface = ifp;
- igmp->ifaddr = ifaddr;
- igmp->t_igmp_read = 0;
- igmp->t_igmp_query_timer = 0;
- igmp->t_other_querier_timer = 0; /* no other querier present */
- igmp->querier_robustness_variable = pim_ifp->igmp_default_robustness_variable;
- igmp->sock_creation = pim_time_monotonic_sec();
- /*
- igmp_startup_mode_on() will reset QQI:
- igmp->querier_query_interval = pim_ifp->igmp_default_query_interval;
- */
- igmp_startup_mode_on(igmp);
- igmp_read_on(igmp);
- pim_igmp_general_query_on(igmp);
- return igmp;
- }
- struct igmp_sock *pim_igmp_sock_add(struct list *igmp_sock_list,
- struct in_addr ifaddr,
- struct interface *ifp)
- {
- struct pim_interface *pim_ifp;
- struct igmp_sock *igmp;
- int fd;
- pim_ifp = ifp->info;
- fd = igmp_sock_open(ifaddr, ifp->ifindex, pim_ifp->options);
- if (fd < 0) {
- zlog_warn("Could not open IGMP socket for %s on %s",
- inet_ntoa(ifaddr), ifp->name);
- return 0;
- }
- igmp = igmp_sock_new(fd, ifaddr, ifp);
- if (!igmp) {
- zlog_err("%s %s: igmp_sock_new() failure",
- __FILE__, __PRETTY_FUNCTION__);
- close(fd);
- return 0;
- }
- listnode_add(igmp_sock_list, igmp);
- #ifdef IGMP_SOCK_DUMP
- igmp_sock_dump(igmp_sock_array);
- #endif
- return igmp;
- }
- /*
- RFC 3376: 6.5. Switching Router Filter-Modes
- When a router's filter-mode for a group is EXCLUDE and the group
- timer expires, the router filter-mode for the group transitions to
- INCLUDE.
- A router uses source records with running source timers as its state
- for the switch to a filter-mode of INCLUDE. If there are any source
- records with source timers greater than zero (i.e., requested to be
- forwarded), a router switches to filter-mode of INCLUDE using those
- source records. Source records whose timers are zero (from the
- previous EXCLUDE mode) are deleted.
- */
- static int igmp_group_timer(struct thread *t)
- {
- struct igmp_group *group;
- zassert(t);
- group = THREAD_ARG(t);
- zassert(group);
- if (PIM_DEBUG_IGMP_TRACE) {
- char group_str[100];
- pim_inet4_dump("<group?>", group->group_addr, group_str, sizeof(group_str));
- zlog_debug("%s: Timer for group %s on interface %s",
- __PRETTY_FUNCTION__,
- group_str, group->group_igmp_sock->interface->name);
- }
- zassert(group->group_filtermode_isexcl);
- group->t_group_timer = 0;
- group->group_filtermode_isexcl = 0;
- /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */
- igmp_anysource_forward_stop(group);
- igmp_source_delete_expired(group->group_source_list);
- zassert(!group->t_group_timer);
- zassert(!group->group_filtermode_isexcl);
- /*
- RFC 3376: 6.2.2. Definition of Group Timers
- If there are no more source records for the group, delete group
- record.
- */
- if (listcount(group->group_source_list) < 1) {
- igmp_group_delete_empty_include(group);
- }
- return 0;
- }
- static void group_timer_off(struct igmp_group *group)
- {
- if (!group->t_group_timer)
- return;
- if (PIM_DEBUG_IGMP_TRACE) {
- char group_str[100];
- pim_inet4_dump("<group?>", group->group_addr, group_str, sizeof(group_str));
- zlog_debug("Cancelling TIMER event for group %s on %s",
- group_str, group->group_igmp_sock->interface->name);
- }
-
- THREAD_OFF(group->t_group_timer);
- zassert(!group->t_group_timer);
- }
- void igmp_group_timer_on(struct igmp_group *group,
- long interval_msec, const char *ifname)
- {
- group_timer_off(group);
- if (PIM_DEBUG_IGMP_EVENTS) {
- char group_str[100];
- pim_inet4_dump("<group?>", group->group_addr, group_str, sizeof(group_str));
- zlog_debug("Scheduling %ld.%03ld sec TIMER event for group %s on %s",
- interval_msec / 1000,
- interval_msec % 1000,
- group_str, ifname);
- }
- /*
- 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);
- THREAD_TIMER_MSEC_ON(master, group->t_group_timer,
- igmp_group_timer,
- group, interval_msec);
- }
- static struct igmp_group *find_group_by_addr(struct igmp_sock *igmp,
- struct in_addr group_addr)
- {
- struct igmp_group *group;
- struct listnode *node;
- for (ALL_LIST_ELEMENTS_RO(igmp->igmp_group_list, node, group))
- if (group_addr.s_addr == group->group_addr.s_addr)
- return group;
- return 0;
- }
- struct igmp_group *igmp_add_group_by_addr(struct igmp_sock *igmp,
- struct in_addr group_addr)
- {
- struct igmp_group *group;
- group = find_group_by_addr(igmp, group_addr);
- if (group) {
- return group;
- }
- /*
- Non-existant group is created as INCLUDE {empty}:
- RFC 3376 - 5.1. Action on Change of Interface State
- If no interface state existed for that multicast address before
- the change (i.e., the change consisted of creating a new
- per-interface record), or if no state exists after the change
- (i.e., the change consisted of deleting a per-interface record),
- then the "non-existent" state is considered to have a filter mode
- of INCLUDE and an empty source list.
- */
- group = XMALLOC(MTYPE_PIM_IGMP_GROUP, sizeof(*group));
- if (!group) {
- zlog_warn("%s %s: XMALLOC() failure",
- __FILE__, __PRETTY_FUNCTION__);
- return 0; /* error, not found, could not create */
- }
- group->group_source_list = list_new();
- if (!group->group_source_list) {
- zlog_warn("%s %s: list_new() failure",
- __FILE__, __PRETTY_FUNCTION__);
- XFREE(MTYPE_PIM_IGMP_GROUP, group); /* discard group */
- return 0; /* error, not found, could not initialize */
- }
- group->group_source_list->del = (void (*)(void *)) igmp_source_free;
- group->t_group_timer = NULL;
- group->t_group_query_retransmit_timer = NULL;
- group->group_specific_query_retransmit_count = 0;
- group->group_addr = group_addr;
- group->group_igmp_sock = igmp;
- group->last_igmp_v1_report_dsec = -1;
- group->last_igmp_v2_report_dsec = -1;
- group->group_creation = pim_time_monotonic_sec();
- /* initialize new group as INCLUDE {empty} */
- group->group_filtermode_isexcl = 0; /* 0=INCLUDE, 1=EXCLUDE */
- listnode_add(igmp->igmp_group_list, group);
- if (PIM_DEBUG_IGMP_TRACE) {
- char group_str[100];
- pim_inet4_dump("<group?>", group->group_addr, group_str, sizeof(group_str));
- zlog_debug("Creating new IGMP group %s on socket %d interface %s",
- group_str, igmp->fd, igmp->interface->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); /* INCLUDE mode */
- zassert(!group->t_group_timer); /* group timer == 0 */
- /* Any source (*,G) is forwarded only if mode is EXCLUDE {empty} */
- igmp_anysource_forward_stop(group);
- return group;
- }
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