diff options
Diffstat (limited to 'pimd/pim_upstream.c')
| -rw-r--r-- | pimd/pim_upstream.c | 2177 |
1 files changed, 2177 insertions, 0 deletions
diff --git a/pimd/pim_upstream.c b/pimd/pim_upstream.c new file mode 100644 index 0000000..dbc5c5d --- /dev/null +++ b/pimd/pim_upstream.c @@ -0,0 +1,2177 @@ +/* + * 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 "zclient.h" +#include "memory.h" +#include "thread.h" +#include "linklist.h" +#include "vty.h" +#include "plist.h" +#include "hash.h" +#include "jhash.h" +#include "wheel.h" +#include "network.h" + +#include "pimd.h" +#include "pim_pim.h" +#include "pim_str.h" +#include "pim_time.h" +#include "pim_iface.h" +#include "pim_join.h" +#include "pim_zlookup.h" +#include "pim_upstream.h" +#include "pim_ifchannel.h" +#include "pim_neighbor.h" +#include "pim_rpf.h" +#include "pim_zebra.h" +#include "pim_oil.h" +#include "pim_macro.h" +#include "pim_rp.h" +#include "pim_br.h" +#include "pim_register.h" +#include "pim_msdp.h" +#include "pim_jp_agg.h" +#include "pim_nht.h" +#include "pim_ssm.h" +#include "pim_vxlan.h" +#include "pim_mlag.h" + +static void join_timer_stop(struct pim_upstream *up); +static void +pim_upstream_update_assert_tracking_desired(struct pim_upstream *up); +static bool pim_upstream_sg_running_proc(struct pim_upstream *up); + +/* + * A (*,G) or a (*,*) is going away + * remove the parent pointer from + * those pointing at us + */ +static void pim_upstream_remove_children(struct pim_instance *pim, + struct pim_upstream *up) +{ + struct pim_upstream *child; + + if (!up->sources) + return; + + while (!list_isempty(up->sources)) { + child = listnode_head(up->sources); + listnode_delete(up->sources, child); + if (PIM_UPSTREAM_FLAG_TEST_SRC_LHR(child->flags)) { + PIM_UPSTREAM_FLAG_UNSET_SRC_LHR(child->flags); + child = pim_upstream_del(pim, child, __func__); + } + if (child) { + child->parent = NULL; + if (PIM_UPSTREAM_FLAG_TEST_USE_RPT(child->flags)) + pim_upstream_mroute_iif_update( + child->channel_oil, + __func__); + } + } + list_delete(&up->sources); +} + +/* + * A (*,G) or a (*,*) is being created + * Find the children that would point + * at us. + */ +static void pim_upstream_find_new_children(struct pim_instance *pim, + struct pim_upstream *up) +{ + struct pim_upstream *child; + + if (!pim_addr_is_any(up->sg.src) && !pim_addr_is_any(up->sg.grp)) + return; + + if (pim_addr_is_any(up->sg.src) && pim_addr_is_any(up->sg.grp)) + return; + + frr_each (rb_pim_upstream, &pim->upstream_head, child) { + if (!pim_addr_is_any(up->sg.grp) && + !pim_addr_cmp(child->sg.grp, up->sg.grp) && (child != up)) { + child->parent = up; + listnode_add_sort(up->sources, child); + if (PIM_UPSTREAM_FLAG_TEST_USE_RPT(child->flags)) + pim_upstream_mroute_iif_update( + child->channel_oil, + __func__); + } + } +} + +/* + * If we have a (*,*) || (S,*) there is no parent + * If we have a (S,G), find the (*,G) + * If we have a (*,G), find the (*,*) + */ +static struct pim_upstream *pim_upstream_find_parent(struct pim_instance *pim, + struct pim_upstream *child) +{ + pim_sgaddr any = child->sg; + struct pim_upstream *up = NULL; + + // (S,G) + if (!pim_addr_is_any(child->sg.src) && + !pim_addr_is_any(child->sg.grp)) { + any.src = PIMADDR_ANY; + up = pim_upstream_find(pim, &any); + + if (up) + listnode_add(up->sources, child); + + /* + * In case parent is MLAG entry copy the data to child + */ + if (up && PIM_UPSTREAM_FLAG_TEST_MLAG_INTERFACE(up->flags)) { + PIM_UPSTREAM_FLAG_SET_MLAG_INTERFACE(child->flags); + if (PIM_UPSTREAM_FLAG_TEST_MLAG_NON_DF(up->flags)) + PIM_UPSTREAM_FLAG_SET_MLAG_NON_DF(child->flags); + else + PIM_UPSTREAM_FLAG_UNSET_MLAG_NON_DF( + child->flags); + } + + return up; + } + + return NULL; +} + +static void upstream_channel_oil_detach(struct pim_upstream *up) +{ + struct channel_oil *channel_oil = up->channel_oil; + + if (channel_oil) { + /* Detaching from channel_oil, channel_oil may exist post del, + but upstream would not keep reference of it + */ + channel_oil->up = NULL; + up->channel_oil = NULL; + + /* attempt to delete channel_oil; if channel_oil is being held + * because of other references cleanup info such as "Mute" + * inferred from the parent upstream + */ + pim_channel_oil_upstream_deref(channel_oil); + } + +} + +static void pim_upstream_timers_stop(struct pim_upstream *up) +{ + THREAD_OFF(up->t_ka_timer); + THREAD_OFF(up->t_rs_timer); + THREAD_OFF(up->t_msdp_reg_timer); + THREAD_OFF(up->t_join_timer); +} + +struct pim_upstream *pim_upstream_del(struct pim_instance *pim, + struct pim_upstream *up, const char *name) +{ + struct listnode *node, *nnode; + struct pim_ifchannel *ch; + bool notify_msdp = false; + + if (PIM_DEBUG_PIM_TRACE) + zlog_debug( + "%s(%s): Delete %s[%s] ref count: %d , flags: %d c_oil ref count %d (Pre decrement)", + __func__, name, up->sg_str, pim->vrf->name, + up->ref_count, up->flags, + up->channel_oil->oil_ref_count); + + assert(up->ref_count > 0); + + --up->ref_count; + + if (up->ref_count >= 1) + return up; + + if (PIM_DEBUG_TRACE) + zlog_debug("pim_upstream free vrf:%s %s flags 0x%x", + pim->vrf->name, up->sg_str, up->flags); + + if (pim_up_mlag_is_local(up)) + pim_mlag_up_local_del(pim, up); + + pim_upstream_timers_stop(up); + + if (up->join_state == PIM_UPSTREAM_JOINED) { + pim_jp_agg_single_upstream_send(&up->rpf, up, 0); + + if (pim_addr_is_any(up->sg.src)) { + /* if a (*, G) entry in the joined state is being + * deleted we + * need to notify MSDP */ + notify_msdp = true; + } + } + + join_timer_stop(up); + pim_jp_agg_upstream_verification(up, false); + up->rpf.source_nexthop.interface = NULL; + + if (!pim_addr_is_any(up->sg.src)) { + if (pim->upstream_sg_wheel) + wheel_remove_item(pim->upstream_sg_wheel, up); + notify_msdp = true; + } + + pim_mroute_del(up->channel_oil, __func__); + upstream_channel_oil_detach(up); + + for (ALL_LIST_ELEMENTS(up->ifchannels, node, nnode, ch)) + pim_ifchannel_delete(ch); + list_delete(&up->ifchannels); + + pim_upstream_remove_children(pim, up); + if (up->sources) + list_delete(&up->sources); + + if (up->parent && up->parent->sources) + listnode_delete(up->parent->sources, up); + up->parent = NULL; + + rb_pim_upstream_del(&pim->upstream_head, up); + + if (notify_msdp) { + pim_msdp_up_del(pim, &up->sg); + } + + /* When RP gets deleted, pim_rp_del() deregister addr with Zebra NHT + * and assign up->upstream_addr as INADDR_ANY. + * So before de-registering the upstream address, check if is not equal + * to INADDR_ANY. This is done in order to avoid de-registering for + * 255.255.255.255 which is maintained for some reason.. + */ + if (!pim_addr_is_any(up->upstream_addr)) { + /* Deregister addr with Zebra NHT */ + if (PIM_DEBUG_PIM_TRACE) + zlog_debug( + "%s: Deregister upstream %s addr %pPA with Zebra NHT", + __func__, up->sg_str, &up->upstream_addr); + pim_delete_tracked_nexthop(pim, up->upstream_addr, up, NULL); + } + + XFREE(MTYPE_PIM_UPSTREAM, up); + + return NULL; +} + +void pim_upstream_send_join(struct pim_upstream *up) +{ + if (!up->rpf.source_nexthop.interface) { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug("%s: up %s RPF is not present", __func__, + up->sg_str); + return; + } + + if (PIM_DEBUG_PIM_TRACE) { + zlog_debug("%s: RPF'%s=%pPA(%s) for Interface %s", __func__, + up->sg_str, &up->rpf.rpf_addr, + pim_upstream_state2str(up->join_state), + up->rpf.source_nexthop.interface->name); + if (pim_rpf_addr_is_inaddr_any(&up->rpf)) { + zlog_debug("%s: can't send join upstream: RPF'%s=%pPA", + __func__, up->sg_str, &up->rpf.rpf_addr); + /* warning only */ + } + } + + /* send Join(S,G) to the current upstream neighbor */ + pim_jp_agg_single_upstream_send(&up->rpf, up, 1 /* join */); +} + +static void on_join_timer(struct thread *t) +{ + struct pim_upstream *up; + + up = THREAD_ARG(t); + + if (!up->rpf.source_nexthop.interface) { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug("%s: up %s RPF is not present", __func__, + up->sg_str); + return; + } + + /* + * In the case of a HFR we will not ahve anyone to send this to. + */ + if (PIM_UPSTREAM_FLAG_TEST_FHR(up->flags)) + return; + + /* + * Don't send the join if the outgoing interface is a loopback + * But since this might change leave the join timer running + */ + if (up->rpf.source_nexthop + .interface && !if_is_loopback(up->rpf.source_nexthop.interface)) + pim_upstream_send_join(up); + + join_timer_start(up); +} + +static void join_timer_stop(struct pim_upstream *up) +{ + struct pim_neighbor *nbr = NULL; + + THREAD_OFF(up->t_join_timer); + + if (up->rpf.source_nexthop.interface) + nbr = pim_neighbor_find(up->rpf.source_nexthop.interface, + up->rpf.rpf_addr); + + if (nbr) + pim_jp_agg_remove_group(nbr->upstream_jp_agg, up, nbr); + + pim_jp_agg_upstream_verification(up, false); +} + +void join_timer_start(struct pim_upstream *up) +{ + struct pim_neighbor *nbr = NULL; + + if (up->rpf.source_nexthop.interface) { + nbr = pim_neighbor_find(up->rpf.source_nexthop.interface, + up->rpf.rpf_addr); + + if (PIM_DEBUG_PIM_EVENTS) { + zlog_debug( + "%s: starting %d sec timer for upstream (S,G)=%s", + __func__, router->t_periodic, up->sg_str); + } + } + + if (nbr) + pim_jp_agg_add_group(nbr->upstream_jp_agg, up, 1, nbr); + else { + THREAD_OFF(up->t_join_timer); + thread_add_timer(router->master, on_join_timer, up, + router->t_periodic, &up->t_join_timer); + } + pim_jp_agg_upstream_verification(up, true); +} + +/* + * This is only called when we are switching the upstream + * J/P from one neighbor to another + * + * As such we need to remove from the old list and + * add to the new list. + */ +void pim_upstream_join_timer_restart(struct pim_upstream *up, + struct pim_rpf *old) +{ + // THREAD_OFF(up->t_join_timer); + join_timer_start(up); +} + +static void pim_upstream_join_timer_restart_msec(struct pim_upstream *up, + int interval_msec) +{ + if (PIM_DEBUG_PIM_EVENTS) { + zlog_debug("%s: restarting %d msec timer for upstream (S,G)=%s", + __func__, interval_msec, up->sg_str); + } + + THREAD_OFF(up->t_join_timer); + thread_add_timer_msec(router->master, on_join_timer, up, interval_msec, + &up->t_join_timer); +} + +void pim_update_suppress_timers(uint32_t suppress_time) +{ + struct pim_instance *pim; + struct vrf *vrf; + unsigned int old_rp_ka_time; + + /* stash the old one so we know which values were manually configured */ + old_rp_ka_time = (3 * router->register_suppress_time + + router->register_probe_time); + router->register_suppress_time = suppress_time; + + RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) { + pim = vrf->info; + if (!pim) + continue; + + /* Only adjust if not manually configured */ + if (pim->rp_keep_alive_time == old_rp_ka_time) + pim->rp_keep_alive_time = PIM_RP_KEEPALIVE_PERIOD; + } +} + +void pim_upstream_join_suppress(struct pim_upstream *up, pim_addr rpf, + int holdtime) +{ + long t_joinsuppress_msec; + long join_timer_remain_msec = 0; + struct pim_neighbor *nbr = NULL; + + if (!up->rpf.source_nexthop.interface) { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug("%s: up %s RPF is not present", __func__, + up->sg_str); + return; + } + + t_joinsuppress_msec = + MIN(pim_if_t_suppressed_msec(up->rpf.source_nexthop.interface), + 1000 * holdtime); + + if (up->t_join_timer) + join_timer_remain_msec = + pim_time_timer_remain_msec(up->t_join_timer); + else { + /* Remove it from jp agg from the nbr for suppression */ + nbr = pim_neighbor_find(up->rpf.source_nexthop.interface, + up->rpf.rpf_addr); + if (nbr) { + join_timer_remain_msec = + pim_time_timer_remain_msec(nbr->jp_timer); + } + } + + if (PIM_DEBUG_PIM_TRACE) + zlog_debug( + "%s %s: detected Join%s to RPF'(S,G)=%pPA: join_timer=%ld msec t_joinsuppress=%ld msec", + __FILE__, __func__, up->sg_str, &rpf, + join_timer_remain_msec, t_joinsuppress_msec); + + if (join_timer_remain_msec < t_joinsuppress_msec) { + if (PIM_DEBUG_PIM_TRACE) { + zlog_debug( + "%s %s: suppressing Join(S,G)=%s for %ld msec", + __FILE__, __func__, up->sg_str, + t_joinsuppress_msec); + } + + if (nbr) + pim_jp_agg_remove_group(nbr->upstream_jp_agg, up, nbr); + + pim_upstream_join_timer_restart_msec(up, t_joinsuppress_msec); + } +} + +void pim_upstream_join_timer_decrease_to_t_override(const char *debug_label, + struct pim_upstream *up) +{ + long join_timer_remain_msec; + int t_override_msec; + + if (!up->rpf.source_nexthop.interface) { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug("%s: up %s RPF is not present", __func__, + up->sg_str); + return; + } + + t_override_msec = + pim_if_t_override_msec(up->rpf.source_nexthop.interface); + + if (up->t_join_timer) { + join_timer_remain_msec = + pim_time_timer_remain_msec(up->t_join_timer); + } else { + /* upstream join tracked with neighbor jp timer */ + struct pim_neighbor *nbr; + + nbr = pim_neighbor_find(up->rpf.source_nexthop.interface, + up->rpf.rpf_addr); + if (nbr) + join_timer_remain_msec = + pim_time_timer_remain_msec(nbr->jp_timer); + else + /* Manipulate such that override takes place */ + join_timer_remain_msec = t_override_msec + 1; + } + + if (PIM_DEBUG_PIM_TRACE) + zlog_debug( + "%s: to RPF'%s=%pPA: join_timer=%ld msec t_override=%d msec", + debug_label, up->sg_str, &up->rpf.rpf_addr, + join_timer_remain_msec, t_override_msec); + + if (join_timer_remain_msec > t_override_msec) { + if (PIM_DEBUG_PIM_TRACE) { + zlog_debug( + "%s: decreasing (S,G)=%s join timer to t_override=%d msec", + debug_label, up->sg_str, t_override_msec); + } + + pim_upstream_join_timer_restart_msec(up, t_override_msec); + } +} + +static void forward_on(struct pim_upstream *up) +{ + struct listnode *chnode; + struct listnode *chnextnode; + struct pim_ifchannel *ch = NULL; + + /* scan (S,G) state */ + for (ALL_LIST_ELEMENTS(up->ifchannels, chnode, chnextnode, ch)) { + if (pim_macro_chisin_oiflist(ch)) + pim_forward_start(ch); + + } /* scan iface channel list */ +} + +static void forward_off(struct pim_upstream *up) +{ + struct listnode *chnode; + struct listnode *chnextnode; + struct pim_ifchannel *ch; + + /* scan per-interface (S,G) state */ + for (ALL_LIST_ELEMENTS(up->ifchannels, chnode, chnextnode, ch)) { + + pim_forward_stop(ch); + + } /* scan iface channel list */ +} + +int pim_upstream_could_register(struct pim_upstream *up) +{ + struct pim_interface *pim_ifp = NULL; + + /* FORCE_PIMREG is a generic flag to let an app like VxLAN-AA register + * a source on an upstream entry even if the source is not directly + * connected on the IIF. + */ + if (PIM_UPSTREAM_FLAG_TEST_FORCE_PIMREG(up->flags)) + return 1; + + if (up->rpf.source_nexthop.interface) + pim_ifp = up->rpf.source_nexthop.interface->info; + else { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug("%s: up %s RPF is not present", __func__, + up->sg_str); + } + + if (pim_ifp && PIM_I_am_DR(pim_ifp) + && pim_if_connected_to_source(up->rpf.source_nexthop.interface, + up->sg.src)) + return 1; + + return 0; +} + +/* Source registration is suppressed for SSM groups. When the SSM range changes + * we re-revaluate register setup for existing upstream entries */ +void pim_upstream_register_reevaluate(struct pim_instance *pim) +{ + struct pim_upstream *up; + + frr_each (rb_pim_upstream, &pim->upstream_head, up) { + /* If FHR is set CouldRegister is True. Also check if the flow + * is actually active; if it is not kat setup will trigger + * source + * registration whenever the flow becomes active. */ + if (!PIM_UPSTREAM_FLAG_TEST_FHR(up->flags) || + !pim_upstream_is_kat_running(up)) + continue; + + if (pim_is_grp_ssm(pim, up->sg.grp)) { + /* clear the register state for SSM groups */ + if (up->reg_state != PIM_REG_NOINFO) { + if (PIM_DEBUG_PIM_EVENTS) + zlog_debug( + "Clear register for %s as G is now SSM", + up->sg_str); + /* remove regiface from the OIL if it is there*/ + pim_channel_del_oif(up->channel_oil, + pim->regiface, + PIM_OIF_FLAG_PROTO_PIM, + __func__); + up->reg_state = PIM_REG_NOINFO; + } + } else { + /* register ASM sources with the RP */ + if (up->reg_state == PIM_REG_NOINFO) { + if (PIM_DEBUG_PIM_EVENTS) + zlog_debug( + "Register %s as G is now ASM", + up->sg_str); + pim_channel_add_oif(up->channel_oil, + pim->regiface, + PIM_OIF_FLAG_PROTO_PIM, + __func__); + up->reg_state = PIM_REG_JOIN; + } + } + } +} + +/* RFC7761, Section 4.2 “Data Packet Forwarding Rules” says we should + * forward a S - + * 1. along the SPT if SPTbit is set + * 2. and along the RPT if SPTbit is not set + * If forwarding is hw accelerated i.e. control and dataplane components + * are separate you may not be able to reliably set SPT bit on intermediate + * routers while still forwarding on the (S,G,rpt). + * + * This macro is a slight deviation on the RFC and uses "traffic-agnostic" + * criteria to decide between using the RPT vs. SPT for forwarding. + */ +void pim_upstream_update_use_rpt(struct pim_upstream *up, + bool update_mroute) +{ + bool old_use_rpt; + bool new_use_rpt; + + if (pim_addr_is_any(up->sg.src)) + return; + + old_use_rpt = !!PIM_UPSTREAM_FLAG_TEST_USE_RPT(up->flags); + + /* We will use the SPT (IIF=RPF_interface(S) if - + * 1. We have decided to join the SPT + * 2. We are FHR + * 3. Source is directly connected + * 4. We are RP (parent's IIF is lo or vrf-device) + * In all other cases the source will stay along the RPT and + * IIF=RPF_interface(RP). + */ + if (up->join_state == PIM_UPSTREAM_JOINED || + PIM_UPSTREAM_FLAG_TEST_FHR(up->flags) || + pim_if_connected_to_source( + up->rpf.source_nexthop.interface, + up->sg.src) || + /* XXX - need to switch this to a more efficient + * lookup API + */ + I_am_RP(up->pim, up->sg.grp)) + /* use SPT */ + PIM_UPSTREAM_FLAG_UNSET_USE_RPT(up->flags); + else + /* use RPT */ + PIM_UPSTREAM_FLAG_SET_USE_RPT(up->flags); + + new_use_rpt = !!PIM_UPSTREAM_FLAG_TEST_USE_RPT(up->flags); + if (old_use_rpt != new_use_rpt) { + if (PIM_DEBUG_PIM_EVENTS) + zlog_debug("%s switched from %s to %s", + up->sg_str, + old_use_rpt?"RPT":"SPT", + new_use_rpt?"RPT":"SPT"); + if (update_mroute) + pim_upstream_mroute_add(up->channel_oil, __func__); + } +} + +/* some events like RP change require re-evaluation of SGrpt across + * all groups + */ +void pim_upstream_reeval_use_rpt(struct pim_instance *pim) +{ + struct pim_upstream *up; + + frr_each (rb_pim_upstream, &pim->upstream_head, up) { + if (pim_addr_is_any(up->sg.src)) + continue; + + pim_upstream_update_use_rpt(up, true /*update_mroute*/); + } +} + +void pim_upstream_switch(struct pim_instance *pim, struct pim_upstream *up, + enum pim_upstream_state new_state) +{ + enum pim_upstream_state old_state = up->join_state; + + if (pim_addr_is_any(up->upstream_addr)) { + if (PIM_DEBUG_PIM_EVENTS) + zlog_debug("%s: RPF not configured for %s", __func__, + up->sg_str); + return; + } + + if (!up->rpf.source_nexthop.interface) { + if (PIM_DEBUG_PIM_EVENTS) + zlog_debug("%s: RP not reachable for %s", __func__, + up->sg_str); + return; + } + + if (PIM_DEBUG_PIM_EVENTS) { + zlog_debug("%s: PIM_UPSTREAM_%s: (S,G) old: %s new: %s", + __func__, up->sg_str, + pim_upstream_state2str(up->join_state), + pim_upstream_state2str(new_state)); + } + + up->join_state = new_state; + if (old_state != new_state) + up->state_transition = pim_time_monotonic_sec(); + + pim_upstream_update_assert_tracking_desired(up); + + if (new_state == PIM_UPSTREAM_JOINED) { + pim_upstream_inherited_olist_decide(pim, up); + if (old_state != PIM_UPSTREAM_JOINED) { + int old_fhr = PIM_UPSTREAM_FLAG_TEST_FHR(up->flags); + + pim_msdp_up_join_state_changed(pim, up); + if (pim_upstream_could_register(up)) { + PIM_UPSTREAM_FLAG_SET_FHR(up->flags); + if (!old_fhr + && PIM_UPSTREAM_FLAG_TEST_SRC_STREAM( + up->flags)) { + pim_upstream_keep_alive_timer_start( + up, pim->keep_alive_time); + pim_register_join(up); + } + } else { + pim_upstream_send_join(up); + join_timer_start(up); + } + } + if (old_state != new_state) + pim_upstream_update_use_rpt(up, true /*update_mroute*/); + } else { + bool old_use_rpt; + bool new_use_rpt; + bool send_xg_jp = false; + + forward_off(up); + /* + * RFC 4601 Sec 4.5.7: + * JoinDesired(S,G) -> False, set SPTbit to false. + */ + if (!pim_addr_is_any(up->sg.src)) + up->sptbit = PIM_UPSTREAM_SPTBIT_FALSE; + + if (old_state == PIM_UPSTREAM_JOINED) + pim_msdp_up_join_state_changed(pim, up); + + if (old_state != new_state) { + old_use_rpt = + !!PIM_UPSTREAM_FLAG_TEST_USE_RPT(up->flags); + pim_upstream_update_use_rpt(up, true /*update_mroute*/); + new_use_rpt = + !!PIM_UPSTREAM_FLAG_TEST_USE_RPT(up->flags); + if (new_use_rpt && + (new_use_rpt != old_use_rpt) && + up->parent) + /* we have decided to switch from the SPT back + * to the RPT which means we need to cancel + * any previously sent SGrpt prunes immediately + */ + send_xg_jp = true; + } + + /* IHR, Trigger SGRpt on *,G IIF to prune S,G from RPT towards + RP. + If I am RP for G then send S,G prune to its IIF. */ + if (pim_upstream_is_sg_rpt(up) && up->parent && + !I_am_RP(pim, up->sg.grp)) + send_xg_jp = true; + + pim_jp_agg_single_upstream_send(&up->rpf, up, 0 /* prune */); + + if (send_xg_jp) { + if (PIM_DEBUG_PIM_TRACE_DETAIL) + zlog_debug( + "re-join RPT; *,G IIF %s S,G IIF %s ", + up->parent->rpf.source_nexthop.interface ? + up->parent->rpf.source_nexthop.interface->name + : "Unknown", + up->rpf.source_nexthop.interface ? + up->rpf.source_nexthop.interface->name : + "Unknown"); + pim_jp_agg_single_upstream_send(&up->parent->rpf, + up->parent, + 1 /* (W,G) Join */); + } + join_timer_stop(up); + } +} + +int pim_upstream_compare(const struct pim_upstream *up1, + const struct pim_upstream *up2) +{ + return pim_sgaddr_cmp(up1->sg, up2->sg); +} + +void pim_upstream_fill_static_iif(struct pim_upstream *up, + struct interface *incoming) +{ + up->rpf.source_nexthop.interface = incoming; + + /* reset other parameters to matched a connected incoming interface */ + up->rpf.source_nexthop.mrib_nexthop_addr = PIMADDR_ANY; + up->rpf.source_nexthop.mrib_metric_preference = + ZEBRA_CONNECT_DISTANCE_DEFAULT; + up->rpf.source_nexthop.mrib_route_metric = 0; + up->rpf.rpf_addr = PIMADDR_ANY; +} + +static struct pim_upstream *pim_upstream_new(struct pim_instance *pim, + pim_sgaddr *sg, + struct interface *incoming, + int flags, + struct pim_ifchannel *ch) +{ + enum pim_rpf_result rpf_result; + struct pim_interface *pim_ifp; + struct pim_upstream *up; + + up = XCALLOC(MTYPE_PIM_UPSTREAM, sizeof(*up)); + + up->pim = pim; + up->sg = *sg; + snprintfrr(up->sg_str, sizeof(up->sg_str), "%pSG", sg); + if (ch) + ch->upstream = up; + + rb_pim_upstream_add(&pim->upstream_head, up); + /* Set up->upstream_addr as INADDR_ANY, if RP is not + * configured and retain the upstream data structure + */ + if (!pim_rp_set_upstream_addr(pim, &up->upstream_addr, sg->src, + sg->grp)) { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug("%s: Received a (*,G) with no RP configured", + __func__); + } + + up->parent = pim_upstream_find_parent(pim, up); + if (pim_addr_is_any(up->sg.src)) { + up->sources = list_new(); + up->sources->cmp = + (int (*)(void *, void *))pim_upstream_compare; + } else + up->sources = NULL; + + pim_upstream_find_new_children(pim, up); + up->flags = flags; + up->ref_count = 1; + up->t_join_timer = NULL; + up->t_ka_timer = NULL; + up->t_rs_timer = NULL; + up->t_msdp_reg_timer = NULL; + up->join_state = PIM_UPSTREAM_NOTJOINED; + up->reg_state = PIM_REG_NOINFO; + up->state_transition = pim_time_monotonic_sec(); + up->channel_oil = pim_channel_oil_add(pim, &up->sg, __func__); + up->sptbit = PIM_UPSTREAM_SPTBIT_FALSE; + + up->rpf.source_nexthop.interface = NULL; + up->rpf.source_nexthop.mrib_nexthop_addr = PIMADDR_ANY; + up->rpf.source_nexthop.mrib_metric_preference = + router->infinite_assert_metric.metric_preference; + up->rpf.source_nexthop.mrib_route_metric = + router->infinite_assert_metric.route_metric; + up->rpf.rpf_addr = PIMADDR_ANY; + up->ifchannels = list_new(); + up->ifchannels->cmp = (int (*)(void *, void *))pim_ifchannel_compare; + + if (!pim_addr_is_any(up->sg.src)) { + wheel_add_item(pim->upstream_sg_wheel, up); + + /* Inherit the DF role from the parent (*, G) entry for + * VxLAN BUM groups + */ + if (up->parent + && PIM_UPSTREAM_FLAG_TEST_MLAG_VXLAN(up->parent->flags) + && PIM_UPSTREAM_FLAG_TEST_MLAG_NON_DF(up->parent->flags)) { + PIM_UPSTREAM_FLAG_SET_MLAG_NON_DF(up->flags); + if (PIM_DEBUG_VXLAN) + zlog_debug( + "upstream %s inherited mlag non-df flag from parent", + up->sg_str); + } + } + + if (PIM_UPSTREAM_FLAG_TEST_STATIC_IIF(up->flags) + || PIM_UPSTREAM_FLAG_TEST_SRC_NOCACHE(up->flags)) { + pim_upstream_fill_static_iif(up, incoming); + pim_ifp = up->rpf.source_nexthop.interface->info; + assert(pim_ifp); + pim_upstream_update_use_rpt(up, + false /*update_mroute*/); + pim_upstream_mroute_iif_update(up->channel_oil, __func__); + + if (PIM_UPSTREAM_FLAG_TEST_SRC_NOCACHE(up->flags)) + pim_upstream_keep_alive_timer_start( + up, pim->keep_alive_time); + } else if (!pim_addr_is_any(up->upstream_addr)) { + pim_upstream_update_use_rpt(up, + false /*update_mroute*/); + rpf_result = pim_rpf_update(pim, up, NULL, __func__); + if (rpf_result == PIM_RPF_FAILURE) { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug( + "%s: Attempting to create upstream(%s), Unable to RPF for source", + __func__, up->sg_str); + } + + /* Consider a case where (S,G,rpt) prune is received and this + * upstream is getting created due to that, then as per RFC + * until prune pending time we need to behave same as NOINFO + * state, therefore do not install if OIF is NULL until then + * This is for PIM Conformance PIM-SM 16.3 fix + * When the prune pending timer pop, this mroute will get + * installed with none as OIF */ + if (up->rpf.source_nexthop.interface && + !(pim_upstream_empty_inherited_olist(up) && (ch != NULL) && + PIM_IF_FLAG_TEST_S_G_RPT(ch->flags))) { + pim_upstream_mroute_iif_update(up->channel_oil, + __func__); + } + } + + /* send the entry to the MLAG peer */ + /* XXX - duplicate send is possible here if pim_rpf_update + * successfully resolved the nexthop + */ + if (pim_up_mlag_is_local(up) + || PIM_UPSTREAM_FLAG_TEST_MLAG_INTERFACE(up->flags)) + pim_mlag_up_local_add(pim, up); + + if (PIM_DEBUG_PIM_TRACE) { + zlog_debug( + "%s: Created Upstream %s upstream_addr %pPAs ref count %d increment", + __func__, up->sg_str, &up->upstream_addr, + up->ref_count); + } + + return up; +} + +uint32_t pim_up_mlag_local_cost(struct pim_upstream *up) +{ + if (!(pim_up_mlag_is_local(up)) + && !(up->flags & PIM_UPSTREAM_FLAG_MASK_MLAG_INTERFACE)) + return router->infinite_assert_metric.route_metric; + + if ((up->rpf.source_nexthop.interface == + up->pim->vxlan.peerlink_rif) && + (up->rpf.source_nexthop.mrib_route_metric < + (router->infinite_assert_metric.route_metric - + PIM_UPSTREAM_MLAG_PEERLINK_PLUS_METRIC))) + return up->rpf.source_nexthop.mrib_route_metric + + PIM_UPSTREAM_MLAG_PEERLINK_PLUS_METRIC; + + return up->rpf.source_nexthop.mrib_route_metric; +} + +uint32_t pim_up_mlag_peer_cost(struct pim_upstream *up) +{ + if (!(up->flags & PIM_UPSTREAM_FLAG_MASK_MLAG_PEER)) + return router->infinite_assert_metric.route_metric; + + return up->mlag.peer_mrib_metric; +} + +struct pim_upstream *pim_upstream_find(struct pim_instance *pim, pim_sgaddr *sg) +{ + struct pim_upstream lookup; + struct pim_upstream *up = NULL; + + lookup.sg = *sg; + up = rb_pim_upstream_find(&pim->upstream_head, &lookup); + return up; +} + +struct pim_upstream *pim_upstream_find_or_add(pim_sgaddr *sg, + struct interface *incoming, + int flags, const char *name) +{ + struct pim_interface *pim_ifp = incoming->info; + + return (pim_upstream_add(pim_ifp->pim, sg, incoming, flags, name, + NULL)); +} + +void pim_upstream_ref(struct pim_upstream *up, int flags, const char *name) +{ + /* if a local MLAG reference is being created we need to send the mroute + * to the peer + */ + if (!PIM_UPSTREAM_FLAG_TEST_MLAG_VXLAN(up->flags) && + PIM_UPSTREAM_FLAG_TEST_MLAG_VXLAN(flags)) { + PIM_UPSTREAM_FLAG_SET_MLAG_VXLAN(up->flags); + pim_mlag_up_local_add(up->pim, up); + } + + /* when we go from non-FHR to FHR we need to re-eval traffic + * forwarding path + */ + if (!PIM_UPSTREAM_FLAG_TEST_FHR(up->flags) && + PIM_UPSTREAM_FLAG_TEST_FHR(flags)) { + PIM_UPSTREAM_FLAG_SET_FHR(up->flags); + pim_upstream_update_use_rpt(up, true /*update_mroute*/); + } + + /* re-eval joinDesired; clearing peer-msdp-sa flag can + * cause JD to change + */ + if (!PIM_UPSTREAM_FLAG_TEST_SRC_MSDP(up->flags) && + PIM_UPSTREAM_FLAG_TEST_SRC_MSDP(flags)) { + PIM_UPSTREAM_FLAG_SET_SRC_MSDP(up->flags); + pim_upstream_update_join_desired(up->pim, up); + } + + up->flags |= flags; + ++up->ref_count; + if (PIM_DEBUG_PIM_TRACE) + zlog_debug("%s(%s): upstream %s ref count %d increment", + __func__, name, up->sg_str, up->ref_count); +} + +struct pim_upstream *pim_upstream_add(struct pim_instance *pim, pim_sgaddr *sg, + struct interface *incoming, int flags, + const char *name, + struct pim_ifchannel *ch) +{ + struct pim_upstream *up = NULL; + int found = 0; + + up = pim_upstream_find(pim, sg); + if (up) { + pim_upstream_ref(up, flags, name); + found = 1; + } else { + up = pim_upstream_new(pim, sg, incoming, flags, ch); + } + + if (PIM_DEBUG_PIM_TRACE) { + zlog_debug( + "%s(%s): %s, iif %pPA (%s) found: %d: ref_count: %d", + __func__, name, up->sg_str, &up->rpf.rpf_addr, + up->rpf.source_nexthop.interface ? up->rpf.source_nexthop + .interface->name + : "Unknown", + found, up->ref_count); + } + + return up; +} + +/* + * Passed in up must be the upstream for ch. starch is NULL if no + * information + * This function is copied over from + * pim_upstream_evaluate_join_desired_interface but limited to + * parent (*,G)'s includes/joins. + */ +int pim_upstream_eval_inherit_if(struct pim_upstream *up, + struct pim_ifchannel *ch, + struct pim_ifchannel *starch) +{ + /* if there is an explicit prune for this interface we cannot + * add it to the OIL + */ + if (ch) { + if (PIM_IF_FLAG_TEST_S_G_RPT(ch->flags)) + return 0; + } + + /* Check if the OIF can be inherited fron the (*,G) entry + */ + if (starch) { + if (!pim_macro_ch_lost_assert(starch) + && pim_macro_chisin_joins_or_include(starch)) + return 1; + } + + return 0; +} + +/* + * Passed in up must be the upstream for ch. starch is NULL if no + * information + */ +int pim_upstream_evaluate_join_desired_interface(struct pim_upstream *up, + struct pim_ifchannel *ch, + struct pim_ifchannel *starch) +{ + if (ch) { + if (PIM_IF_FLAG_TEST_S_G_RPT(ch->flags)) + return 0; + + if (!pim_macro_ch_lost_assert(ch) + && pim_macro_chisin_joins_or_include(ch)) + return 1; + } + + /* + * joins (*,G) + */ + if (starch) { + /* XXX: check on this with donald + * we are looking for PIM_IF_FLAG_MASK_S_G_RPT in + * upstream flags? + */ +#if 0 + if (PIM_IF_FLAG_TEST_S_G_RPT(starch->upstream->flags)) + return 0; +#endif + + if (!pim_macro_ch_lost_assert(starch) + && pim_macro_chisin_joins_or_include(starch)) + return 1; + } + + return 0; +} + +/* Returns true if immediate OIL is empty and is used to evaluate + * JoinDesired. See pim_upstream_evaluate_join_desired. + */ +static bool pim_upstream_empty_immediate_olist(struct pim_instance *pim, + struct pim_upstream *up) +{ + struct interface *ifp; + struct pim_ifchannel *ch; + + FOR_ALL_INTERFACES (pim->vrf, ifp) { + if (!ifp->info) + continue; + + ch = pim_ifchannel_find(ifp, &up->sg); + if (!ch) + continue; + + /* If we have even one immediate OIF we can return with + * not-empty + */ + if (pim_upstream_evaluate_join_desired_interface(up, ch, + NULL /* starch */)) + return false; + } /* scan iface channel list */ + + /* immediate_oil is empty */ + return true; +} + + +static inline bool pim_upstream_is_msdp_peer_sa(struct pim_upstream *up) +{ + return PIM_UPSTREAM_FLAG_TEST_SRC_MSDP(up->flags); +} + +/* + * bool JoinDesired(*,G) { + * if (immediate_olist(*,G) != NULL) + * return TRUE + * else + * return FALSE + * } + * + * bool JoinDesired(S,G) { + * return( immediate_olist(S,G) != NULL + * OR ( KeepaliveTimer(S,G) is running + * AND inherited_olist(S,G) != NULL ) ) + * } + */ +bool pim_upstream_evaluate_join_desired(struct pim_instance *pim, + struct pim_upstream *up) +{ + bool empty_imm_oil; + bool empty_inh_oil; + + empty_imm_oil = pim_upstream_empty_immediate_olist(pim, up); + + /* (*,G) */ + if (pim_addr_is_any(up->sg.src)) + return !empty_imm_oil; + + /* (S,G) */ + if (!empty_imm_oil) + return true; + empty_inh_oil = pim_upstream_empty_inherited_olist(up); + if (!empty_inh_oil && + (pim_upstream_is_kat_running(up) || + pim_upstream_is_msdp_peer_sa(up))) + return true; + + return false; +} + +/* + See also pim_upstream_evaluate_join_desired() above. +*/ +void pim_upstream_update_join_desired(struct pim_instance *pim, + struct pim_upstream *up) +{ + int was_join_desired; /* boolean */ + int is_join_desired; /* boolean */ + + was_join_desired = PIM_UPSTREAM_FLAG_TEST_DR_JOIN_DESIRED(up->flags); + + is_join_desired = pim_upstream_evaluate_join_desired(pim, up); + if (is_join_desired) + PIM_UPSTREAM_FLAG_SET_DR_JOIN_DESIRED(up->flags); + else + PIM_UPSTREAM_FLAG_UNSET_DR_JOIN_DESIRED(up->flags); + + /* switched from false to true */ + if (is_join_desired && (up->join_state == PIM_UPSTREAM_NOTJOINED)) { + pim_upstream_switch(pim, up, PIM_UPSTREAM_JOINED); + return; + } + + /* switched from true to false */ + if (!is_join_desired && was_join_desired) { + pim_upstream_switch(pim, up, PIM_UPSTREAM_NOTJOINED); + return; + } +} + +/* + RFC 4601 4.5.7. Sending (S,G) Join/Prune Messages + Transitions from Joined State + RPF'(S,G) GenID changes + + The upstream (S,G) state machine remains in Joined state. If the + Join Timer is set to expire in more than t_override seconds, reset + it so that it expires after t_override seconds. +*/ +void pim_upstream_rpf_genid_changed(struct pim_instance *pim, + pim_addr neigh_addr) +{ + struct pim_upstream *up; + + /* + * Scan all (S,G) upstreams searching for RPF'(S,G)=neigh_addr + */ + frr_each (rb_pim_upstream, &pim->upstream_head, up) { + pim_addr rpf_addr; + + rpf_addr = up->rpf.rpf_addr; + + if (PIM_DEBUG_PIM_TRACE) + zlog_debug( + "%s: matching neigh=%pPA against upstream (S,G)=%s[%s] joined=%d rpf_addr=%pPA", + __func__, &neigh_addr, up->sg_str, + pim->vrf->name, + up->join_state == PIM_UPSTREAM_JOINED, + &rpf_addr); + + /* consider only (S,G) upstream in Joined state */ + if (up->join_state != PIM_UPSTREAM_JOINED) + continue; + + /* match RPF'(S,G)=neigh_addr */ + if (pim_addr_cmp(rpf_addr, neigh_addr)) + continue; + + pim_upstream_join_timer_decrease_to_t_override( + "RPF'(S,G) GenID change", up); + } +} + + +void pim_upstream_rpf_interface_changed(struct pim_upstream *up, + struct interface *old_rpf_ifp) +{ + struct listnode *chnode; + struct listnode *chnextnode; + struct pim_ifchannel *ch; + + /* search all ifchannels */ + for (ALL_LIST_ELEMENTS(up->ifchannels, chnode, chnextnode, ch)) { + if (ch->ifassert_state == PIM_IFASSERT_I_AM_LOSER) { + if ( + /* RPF_interface(S) was NOT I */ + (old_rpf_ifp == ch->interface) && + /* RPF_interface(S) stopped being I */ + (ch->upstream->rpf.source_nexthop + .interface) && + (ch->upstream->rpf.source_nexthop + .interface != ch->interface)) { + assert_action_a5(ch); + } + } /* PIM_IFASSERT_I_AM_LOSER */ + + pim_ifchannel_update_assert_tracking_desired(ch); + } +} + +void pim_upstream_update_could_assert(struct pim_upstream *up) +{ + struct listnode *chnode; + struct listnode *chnextnode; + struct pim_ifchannel *ch; + + /* scan per-interface (S,G) state */ + for (ALL_LIST_ELEMENTS(up->ifchannels, chnode, chnextnode, ch)) { + pim_ifchannel_update_could_assert(ch); + } /* scan iface channel list */ +} + +void pim_upstream_update_my_assert_metric(struct pim_upstream *up) +{ + struct listnode *chnode; + struct listnode *chnextnode; + struct pim_ifchannel *ch; + + /* scan per-interface (S,G) state */ + for (ALL_LIST_ELEMENTS(up->ifchannels, chnode, chnextnode, ch)) { + pim_ifchannel_update_my_assert_metric(ch); + + } /* scan iface channel list */ +} + +static void pim_upstream_update_assert_tracking_desired(struct pim_upstream *up) +{ + struct listnode *chnode; + struct listnode *chnextnode; + struct pim_interface *pim_ifp; + struct pim_ifchannel *ch; + + /* scan per-interface (S,G) state */ + for (ALL_LIST_ELEMENTS(up->ifchannels, chnode, chnextnode, ch)) { + if (!ch->interface) + continue; + pim_ifp = ch->interface->info; + if (!pim_ifp) + continue; + + pim_ifchannel_update_assert_tracking_desired(ch); + + } /* scan iface channel list */ +} + +/* When kat is stopped CouldRegister goes to false so we need to + * transition the (S, G) on FHR to NI state and remove reg tunnel + * from the OIL */ +static void pim_upstream_fhr_kat_expiry(struct pim_instance *pim, + struct pim_upstream *up) +{ + if (!PIM_UPSTREAM_FLAG_TEST_FHR(up->flags)) + return; + + if (PIM_DEBUG_PIM_TRACE) + zlog_debug("kat expired on %s; clear fhr reg state", + up->sg_str); + + /* stop reg-stop timer */ + THREAD_OFF(up->t_rs_timer); + /* remove regiface from the OIL if it is there*/ + pim_channel_del_oif(up->channel_oil, pim->regiface, + PIM_OIF_FLAG_PROTO_PIM, __func__); + /* clear the register state */ + up->reg_state = PIM_REG_NOINFO; + PIM_UPSTREAM_FLAG_UNSET_FHR(up->flags); +} + +/* When kat is started CouldRegister can go to true. And if it does we + * need to transition the (S, G) on FHR to JOINED state and add reg tunnel + * to the OIL */ +static void pim_upstream_fhr_kat_start(struct pim_upstream *up) +{ + if (pim_upstream_could_register(up)) { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug( + "kat started on %s; set fhr reg state to joined", + up->sg_str); + + PIM_UPSTREAM_FLAG_SET_FHR(up->flags); + if (up->reg_state == PIM_REG_NOINFO) + pim_register_join(up); + pim_upstream_update_use_rpt(up, true /*update_mroute*/); + } +} + +/* + * On an RP, the PMBR value must be cleared when the + * Keepalive Timer expires + * KAT expiry indicates that flow is inactive. If the flow was created or + * maintained by activity now is the time to deref it. + */ +struct pim_upstream *pim_upstream_keep_alive_timer_proc( + struct pim_upstream *up) +{ + struct pim_instance *pim; + + pim = up->channel_oil->pim; + + if (PIM_UPSTREAM_FLAG_TEST_DISABLE_KAT_EXPIRY(up->flags)) { + /* if the router is a PIM vxlan encapsulator we prevent expiry + * of KAT as the mroute is pre-setup without any traffic + */ + pim_upstream_keep_alive_timer_start(up, pim->keep_alive_time); + return up; + } + + if (I_am_RP(pim, up->sg.grp)) { + pim_br_clear_pmbr(&up->sg); + /* + * We need to do more here :) + * But this is the start. + */ + } + + /* source is no longer active - pull the SA from MSDP's cache */ + pim_msdp_sa_local_del(pim, &up->sg); + + /* JoinDesired can change when KAT is started or stopped */ + pim_upstream_update_join_desired(pim, up); + + /* if entry was created because of activity we need to deref it */ + if (PIM_UPSTREAM_FLAG_TEST_SRC_STREAM(up->flags)) { + pim_upstream_fhr_kat_expiry(pim, up); + if (PIM_DEBUG_PIM_TRACE) + zlog_debug( + "kat expired on %s[%s]; remove stream reference", + up->sg_str, pim->vrf->name); + PIM_UPSTREAM_FLAG_UNSET_SRC_STREAM(up->flags); + + /* Return if upstream entry got deleted.*/ + if (!pim_upstream_del(pim, up, __func__)) + return NULL; + } + if (PIM_UPSTREAM_FLAG_TEST_SRC_NOCACHE(up->flags)) { + PIM_UPSTREAM_FLAG_UNSET_SRC_NOCACHE(up->flags); + + if (!pim_upstream_del(pim, up, __func__)) + return NULL; + } + + /* upstream reference would have been added to track the local + * membership if it is LHR. We have to clear it when KAT expires. + * Otherwise would result in stale entry with uncleared ref count. + */ + if (PIM_UPSTREAM_FLAG_TEST_SRC_LHR(up->flags)) { + struct pim_upstream *parent = up->parent; + + PIM_UPSTREAM_FLAG_UNSET_SRC_LHR(up->flags); + up = pim_upstream_del(pim, up, __func__); + + if (parent) { + pim_jp_agg_single_upstream_send(&parent->rpf, parent, + true); + } + } + + return up; +} +static void pim_upstream_keep_alive_timer(struct thread *t) +{ + struct pim_upstream *up; + + up = THREAD_ARG(t); + + /* pull the stats and re-check */ + if (pim_upstream_sg_running_proc(up)) + /* kat was restarted because of new activity */ + return; + + pim_upstream_keep_alive_timer_proc(up); +} + +void pim_upstream_keep_alive_timer_start(struct pim_upstream *up, uint32_t time) +{ + if (!PIM_UPSTREAM_FLAG_TEST_SRC_STREAM(up->flags)) { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug("kat start on %s with no stream reference", + up->sg_str); + } + THREAD_OFF(up->t_ka_timer); + thread_add_timer(router->master, pim_upstream_keep_alive_timer, up, + time, &up->t_ka_timer); + + /* any time keepalive is started against a SG we will have to + * re-evaluate our active source database */ + pim_msdp_sa_local_update(up); + /* JoinDesired can change when KAT is started or stopped */ + pim_upstream_update_join_desired(up->pim, up); +} + +/* MSDP on RP needs to know if a source is registerable to this RP */ +static void pim_upstream_msdp_reg_timer(struct thread *t) +{ + struct pim_upstream *up = THREAD_ARG(t); + struct pim_instance *pim = up->channel_oil->pim; + + /* source is no longer active - pull the SA from MSDP's cache */ + pim_msdp_sa_local_del(pim, &up->sg); +} + +void pim_upstream_msdp_reg_timer_start(struct pim_upstream *up) +{ + THREAD_OFF(up->t_msdp_reg_timer); + thread_add_timer(router->master, pim_upstream_msdp_reg_timer, up, + PIM_MSDP_REG_RXED_PERIOD, &up->t_msdp_reg_timer); + + pim_msdp_sa_local_update(up); +} + +/* + * 4.2.1 Last-Hop Switchover to the SPT + * + * In Sparse-Mode PIM, last-hop routers join the shared tree towards the + * RP. Once traffic from sources to joined groups arrives at a last-hop + * router, it has the option of switching to receive the traffic on a + * shortest path tree (SPT). + * + * The decision for a router to switch to the SPT is controlled as + * follows: + * + * void + * CheckSwitchToSpt(S,G) { + * if ( ( pim_include(*,G) (-) pim_exclude(S,G) + * (+) pim_include(S,G) != NULL ) + * AND SwitchToSptDesired(S,G) ) { + * # Note: Restarting the KAT will result in the SPT switch + * set KeepaliveTimer(S,G) to Keepalive_Period + * } + * } + * + * SwitchToSptDesired(S,G) is a policy function that is implementation + * defined. An "infinite threshold" policy can be implemented by making + * SwitchToSptDesired(S,G) return false all the time. A "switch on + * first packet" policy can be implemented by making + * SwitchToSptDesired(S,G) return true once a single packet has been + * received for the source and group. + */ +int pim_upstream_switch_to_spt_desired_on_rp(struct pim_instance *pim, + pim_sgaddr *sg) +{ + if (I_am_RP(pim, sg->grp)) + return 1; + + return 0; +} + +int pim_upstream_is_sg_rpt(struct pim_upstream *up) +{ + struct listnode *chnode; + struct pim_ifchannel *ch; + + for (ALL_LIST_ELEMENTS_RO(up->ifchannels, chnode, ch)) { + if (PIM_IF_FLAG_TEST_S_G_RPT(ch->flags)) + return 1; + } + + return 0; +} +/* + * After receiving a packet set SPTbit: + * void + * Update_SPTbit(S,G,iif) { + * if ( iif == RPF_interface(S) + * AND JoinDesired(S,G) == true + * AND ( DirectlyConnected(S) == true + * OR RPF_interface(S) != RPF_interface(RP(G)) + * OR inherited_olist(S,G,rpt) == NULL + * OR ( ( RPF'(S,G) == RPF'(*,G) ) AND + * ( RPF'(S,G) != NULL ) ) + * OR ( I_Am_Assert_Loser(S,G,iif) ) { + * Set SPTbit(S,G) to true + * } + * } + */ +void pim_upstream_set_sptbit(struct pim_upstream *up, + struct interface *incoming) +{ + struct pim_upstream *starup = up->parent; + + // iif == RPF_interfvace(S) + if (up->rpf.source_nexthop.interface != incoming) { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug( + "%s: Incoming Interface: %s is different than RPF_interface(S) %s", + __func__, incoming->name, + up->rpf.source_nexthop.interface->name); + return; + } + + // AND JoinDesired(S,G) == true + if (!pim_upstream_evaluate_join_desired(up->channel_oil->pim, up)) { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug("%s: %s Join is not Desired", __func__, + up->sg_str); + return; + } + + // DirectlyConnected(S) == true + if (pim_if_connected_to_source(up->rpf.source_nexthop.interface, + up->sg.src)) { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug("%s: %s is directly connected to the source", + __func__, up->sg_str); + up->sptbit = PIM_UPSTREAM_SPTBIT_TRUE; + return; + } + + // OR RPF_interface(S) != RPF_interface(RP(G)) + if (!starup + || up->rpf.source_nexthop + .interface != starup->rpf.source_nexthop.interface) { + struct pim_upstream *starup = up->parent; + + if (PIM_DEBUG_PIM_TRACE) + zlog_debug( + "%s: %s RPF_interface(S) != RPF_interface(RP(G))", + __func__, up->sg_str); + up->sptbit = PIM_UPSTREAM_SPTBIT_TRUE; + + pim_jp_agg_single_upstream_send(&starup->rpf, starup, true); + return; + } + + // OR inherited_olist(S,G,rpt) == NULL + if (pim_upstream_is_sg_rpt(up) + && pim_upstream_empty_inherited_olist(up)) { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug("%s: %s OR inherited_olist(S,G,rpt) == NULL", + __func__, up->sg_str); + up->sptbit = PIM_UPSTREAM_SPTBIT_TRUE; + return; + } + + // OR ( ( RPF'(S,G) == RPF'(*,G) ) AND + // ( RPF'(S,G) != NULL ) ) + if (up->parent && pim_rpf_is_same(&up->rpf, &up->parent->rpf)) { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug("%s: %s RPF'(S,G) is the same as RPF'(*,G)", + __func__, up->sg_str); + up->sptbit = PIM_UPSTREAM_SPTBIT_TRUE; + return; + } + + return; +} + +const char *pim_upstream_state2str(enum pim_upstream_state join_state) +{ + switch (join_state) { + case PIM_UPSTREAM_NOTJOINED: + return "NotJoined"; + case PIM_UPSTREAM_JOINED: + return "Joined"; + } + return "Unknown"; +} + +const char *pim_reg_state2str(enum pim_reg_state reg_state, char *state_str, + size_t state_str_len) +{ + switch (reg_state) { + case PIM_REG_NOINFO: + strlcpy(state_str, "RegNoInfo", state_str_len); + break; + case PIM_REG_JOIN: + strlcpy(state_str, "RegJoined", state_str_len); + break; + case PIM_REG_JOIN_PENDING: + strlcpy(state_str, "RegJoinPend", state_str_len); + break; + case PIM_REG_PRUNE: + strlcpy(state_str, "RegPrune", state_str_len); + break; + } + return state_str; +} + +static void pim_upstream_register_stop_timer(struct thread *t) +{ + struct pim_interface *pim_ifp; + struct pim_instance *pim; + struct pim_upstream *up; + up = THREAD_ARG(t); + pim = up->channel_oil->pim; + + if (PIM_DEBUG_PIM_TRACE) { + char state_str[PIM_REG_STATE_STR_LEN]; + zlog_debug("%s: (S,G)=%s[%s] upstream register stop timer %s", + __func__, up->sg_str, pim->vrf->name, + pim_reg_state2str(up->reg_state, state_str, + sizeof(state_str))); + } + + switch (up->reg_state) { + case PIM_REG_JOIN_PENDING: + up->reg_state = PIM_REG_JOIN; + pim_channel_add_oif(up->channel_oil, pim->regiface, + PIM_OIF_FLAG_PROTO_PIM, + __func__); + pim_vxlan_update_sg_reg_state(pim, up, true /*reg_join*/); + break; + case PIM_REG_JOIN: + break; + case PIM_REG_PRUNE: + /* This is equalent to Couldreg -> False */ + if (!up->rpf.source_nexthop.interface) { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug("%s: up %s RPF is not present", + __func__, up->sg_str); + up->reg_state = PIM_REG_NOINFO; + return; + } + + pim_ifp = up->rpf.source_nexthop.interface->info; + if (!pim_ifp) { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug( + "%s: Interface: %s is not configured for pim", + __func__, + up->rpf.source_nexthop.interface->name); + return; + } + up->reg_state = PIM_REG_JOIN_PENDING; + pim_upstream_start_register_stop_timer(up, 1); + + if (((up->channel_oil->cc.lastused / 100) + > pim->keep_alive_time) + && (I_am_RP(pim_ifp->pim, up->sg.grp))) { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug( + "%s: Stop sending the register, because I am the RP and we haven't seen a packet in a while", + __func__); + return; + } + pim_null_register_send(up); + break; + case PIM_REG_NOINFO: + break; + } +} + +void pim_upstream_start_register_stop_timer(struct pim_upstream *up, + int null_register) +{ + uint32_t time; + + THREAD_OFF(up->t_rs_timer); + + if (!null_register) { + uint32_t lower = (0.5 * router->register_suppress_time); + uint32_t upper = (1.5 * router->register_suppress_time); + time = lower + (frr_weak_random() % (upper - lower + 1)); + /* Make sure we don't wrap around */ + if (time >= router->register_probe_time) + time -= router->register_probe_time; + else + time = 0; + } else + time = router->register_probe_time; + + if (PIM_DEBUG_PIM_TRACE) { + zlog_debug( + "%s: (S,G)=%s Starting upstream register stop timer %d", + __func__, up->sg_str, time); + } + thread_add_timer(router->master, pim_upstream_register_stop_timer, up, + time, &up->t_rs_timer); +} + +int pim_upstream_inherited_olist_decide(struct pim_instance *pim, + struct pim_upstream *up) +{ + struct interface *ifp; + struct pim_ifchannel *ch, *starch; + struct pim_upstream *starup = up->parent; + int output_intf = 0; + + if (!up->rpf.source_nexthop.interface) + if (PIM_DEBUG_PIM_TRACE) + zlog_debug("%s: up %s RPF is not present", __func__, + up->sg_str); + + FOR_ALL_INTERFACES (pim->vrf, ifp) { + struct pim_interface *pim_ifp; + if (!ifp->info) + continue; + + ch = pim_ifchannel_find(ifp, &up->sg); + + if (starup) + starch = pim_ifchannel_find(ifp, &starup->sg); + else + starch = NULL; + + if (!ch && !starch) + continue; + + pim_ifp = ifp->info; + if (PIM_I_am_DualActive(pim_ifp) + && PIM_UPSTREAM_FLAG_TEST_MLAG_INTERFACE(up->flags) + && (PIM_UPSTREAM_FLAG_TEST_MLAG_NON_DF(up->flags) + || !PIM_UPSTREAM_FLAG_TEST_MLAG_PEER(up->flags))) + continue; + if (pim_upstream_evaluate_join_desired_interface(up, ch, + starch)) { + int flag = 0; + + if (!ch) + flag = PIM_OIF_FLAG_PROTO_STAR; + else { + if (PIM_IF_FLAG_TEST_PROTO_IGMP(ch->flags)) + flag = PIM_OIF_FLAG_PROTO_GM; + if (PIM_IF_FLAG_TEST_PROTO_PIM(ch->flags)) + flag |= PIM_OIF_FLAG_PROTO_PIM; + if (starch) + flag |= PIM_OIF_FLAG_PROTO_STAR; + } + + pim_channel_add_oif(up->channel_oil, ifp, flag, + __func__); + output_intf++; + } + } + + return output_intf; +} + +/* + * For a given upstream, determine the inherited_olist + * and apply it. + * + * inherited_olist(S,G,rpt) = + * ( joins(*,*,RP(G)) (+) joins(*,G) (-) prunes(S,G,rpt) ) + * (+) ( pim_include(*,G) (-) pim_exclude(S,G)) + * (-) ( lost_assert(*,G) (+) lost_assert(S,G,rpt) ) + * + * inherited_olist(S,G) = + * inherited_olist(S,G,rpt) (+) + * joins(S,G) (+) pim_include(S,G) (-) lost_assert(S,G) + * + * return 1 if there are any output interfaces + * return 0 if there are not any output interfaces + */ +int pim_upstream_inherited_olist(struct pim_instance *pim, + struct pim_upstream *up) +{ + int output_intf = pim_upstream_inherited_olist_decide(pim, up); + + /* + * If we have output_intf switch state to Join and work like normal + * If we don't have an output_intf that means we are probably a + * switch on a stick so turn on forwarding to just accept the + * incoming packets so we don't bother the other stuff! + */ + pim_upstream_update_join_desired(pim, up); + + if (!output_intf) + forward_on(up); + + return output_intf; +} + +int pim_upstream_empty_inherited_olist(struct pim_upstream *up) +{ + return pim_channel_oil_empty(up->channel_oil); +} + +/* + * When we have a new neighbor, + * find upstreams that don't have their rpf_addr + * set and see if the new neighbor allows + * the join to be sent + */ +void pim_upstream_find_new_rpf(struct pim_instance *pim) +{ + struct pim_upstream *up; + struct pim_rpf old; + enum pim_rpf_result rpf_result; + + /* + * Scan all (S,G) upstreams searching for RPF'(S,G)=neigh_addr + */ + frr_each (rb_pim_upstream, &pim->upstream_head, up) { + if (pim_addr_is_any(up->upstream_addr)) { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug( + "%s: RP not configured for Upstream %s", + __func__, up->sg_str); + continue; + } + + if (pim_rpf_addr_is_inaddr_any(&up->rpf)) { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug( + "%s: Upstream %s without a path to send join, checking", + __func__, up->sg_str); + old.source_nexthop.interface = + up->rpf.source_nexthop.interface; + rpf_result = pim_rpf_update(pim, up, &old, __func__); + if (rpf_result == PIM_RPF_CHANGED || + (rpf_result == PIM_RPF_FAILURE && + old.source_nexthop.interface)) + pim_zebra_upstream_rpf_changed(pim, up, &old); + /* update kernel multicast forwarding cache (MFC) */ + pim_upstream_mroute_iif_update(up->channel_oil, + __func__); + } + } + pim_zebra_update_all_interfaces(pim); +} + +unsigned int pim_upstream_hash_key(const void *arg) +{ + const struct pim_upstream *up = arg; + + return pim_sgaddr_hash(up->sg, 0); +} + +void pim_upstream_terminate(struct pim_instance *pim) +{ + struct pim_upstream *up; + + while ((up = rb_pim_upstream_first(&pim->upstream_head))) { + if (pim_upstream_del(pim, up, __func__)) + pim_upstream_timers_stop(up); + } + + rb_pim_upstream_fini(&pim->upstream_head); + + if (pim->upstream_sg_wheel) + wheel_delete(pim->upstream_sg_wheel); + pim->upstream_sg_wheel = NULL; +} + +bool pim_upstream_equal(const void *arg1, const void *arg2) +{ + const struct pim_upstream *up1 = (const struct pim_upstream *)arg1; + const struct pim_upstream *up2 = (const struct pim_upstream *)arg2; + + return !pim_sgaddr_cmp(up1->sg, up2->sg); +} + +/* rfc4601:section-4.2:"Data Packet Forwarding Rules" defines + * the cases where kat has to be restarted on rxing traffic - + * + * if( DirectlyConnected(S) == true AND iif == RPF_interface(S) ) { + * set KeepaliveTimer(S,G) to Keepalive_Period + * # Note: a register state transition or UpstreamJPState(S,G) + * # transition may happen as a result of restarting + * # KeepaliveTimer, and must be dealt with here. + * } + * if( iif == RPF_interface(S) AND UpstreamJPState(S,G) == Joined AND + * inherited_olist(S,G) != NULL ) { + * set KeepaliveTimer(S,G) to Keepalive_Period + * } + */ +static bool pim_upstream_kat_start_ok(struct pim_upstream *up) +{ + struct channel_oil *c_oil = up->channel_oil; + struct interface *ifp = up->rpf.source_nexthop.interface; + struct pim_interface *pim_ifp; + + /* "iif == RPF_interface(S)" check is not easy to do as the info + * we get from the kernel/ASIC is really a "lookup/key hit". + * So we will do an approximate check here to avoid starting KAT + * because of (S,G,rpt) forwarding on a non-LHR. + */ + if (!ifp) + return false; + + pim_ifp = ifp->info; + if (pim_ifp->mroute_vif_index != *oil_parent(c_oil)) + return false; + + if (pim_if_connected_to_source(up->rpf.source_nexthop.interface, + up->sg.src)) { + return true; + } + + if ((up->join_state == PIM_UPSTREAM_JOINED) + && !pim_upstream_empty_inherited_olist(up)) { + return true; + } + + return false; +} + +static bool pim_upstream_sg_running_proc(struct pim_upstream *up) +{ + bool rv = false; + struct pim_instance *pim = up->pim; + + if (!up->channel_oil->installed) + return rv; + + pim_mroute_update_counters(up->channel_oil); + + // Have we seen packets? + if ((up->channel_oil->cc.oldpktcnt >= up->channel_oil->cc.pktcnt) + && (up->channel_oil->cc.lastused / 100 > 30)) { + if (PIM_DEBUG_PIM_TRACE) { + zlog_debug( + "%s[%s]: %s old packet count is equal or lastused is greater than 30, (%ld,%ld,%lld)", + __func__, up->sg_str, pim->vrf->name, + up->channel_oil->cc.oldpktcnt, + up->channel_oil->cc.pktcnt, + up->channel_oil->cc.lastused / 100); + } + return rv; + } + + if (pim_upstream_kat_start_ok(up)) { + /* Add a source reference to the stream if + * one doesn't already exist */ + if (!PIM_UPSTREAM_FLAG_TEST_SRC_STREAM(up->flags)) { + if (PIM_DEBUG_PIM_TRACE) + zlog_debug( + "source reference created on kat restart %s[%s]", + up->sg_str, pim->vrf->name); + + pim_upstream_ref(up, PIM_UPSTREAM_FLAG_MASK_SRC_STREAM, + __func__); + PIM_UPSTREAM_FLAG_SET_SRC_STREAM(up->flags); + pim_upstream_fhr_kat_start(up); + } + pim_upstream_keep_alive_timer_start(up, pim->keep_alive_time); + rv = true; + } else if (PIM_UPSTREAM_FLAG_TEST_SRC_LHR(up->flags)) { + pim_upstream_keep_alive_timer_start(up, pim->keep_alive_time); + rv = true; + } + + if ((up->sptbit != PIM_UPSTREAM_SPTBIT_TRUE) && + (up->rpf.source_nexthop.interface)) { + pim_upstream_set_sptbit(up, up->rpf.source_nexthop.interface); + pim_upstream_update_could_assert(up); + } + + return rv; +} + +/* + * Code to check and see if we've received packets on a S,G mroute + * and if so to set the SPT bit appropriately + */ +static void pim_upstream_sg_running(void *arg) +{ + struct pim_upstream *up = (struct pim_upstream *)arg; + struct pim_instance *pim = up->channel_oil->pim; + + // No packet can have arrived here if this is the case + if (!up->channel_oil->installed) { + if (PIM_DEBUG_TRACE) + zlog_debug("%s: %s%s is not installed in mroute", + __func__, up->sg_str, pim->vrf->name); + return; + } + + /* + * This is a bit of a hack + * We've noted that we should rescan but + * we've missed the window for doing so in + * pim_zebra.c for some reason. I am + * only doing this at this point in time + * to get us up and working for the moment + */ + if (up->channel_oil->oil_inherited_rescan) { + if (PIM_DEBUG_TRACE) + zlog_debug( + "%s: Handling unscanned inherited_olist for %s[%s]", + __func__, up->sg_str, pim->vrf->name); + pim_upstream_inherited_olist_decide(pim, up); + up->channel_oil->oil_inherited_rescan = 0; + } + + pim_upstream_sg_running_proc(up); +} + +void pim_upstream_add_lhr_star_pimreg(struct pim_instance *pim) +{ + struct pim_upstream *up; + + frr_each (rb_pim_upstream, &pim->upstream_head, up) { + if (!pim_addr_is_any(up->sg.src)) + continue; + + if (!PIM_UPSTREAM_FLAG_TEST_CAN_BE_LHR(up->flags)) + continue; + + pim_channel_add_oif(up->channel_oil, pim->regiface, + PIM_OIF_FLAG_PROTO_GM, __func__); + } +} + +void pim_upstream_spt_prefix_list_update(struct pim_instance *pim, + struct prefix_list *pl) +{ + const char *pname = prefix_list_name(pl); + + if (pim->spt.plist && strcmp(pim->spt.plist, pname) == 0) { + pim_upstream_remove_lhr_star_pimreg(pim, pname); + } +} + +/* + * nlist -> The new prefix list + * + * Per Group Application of pimreg to the OIL + * If the prefix list tells us DENY then + * we need to Switchover to SPT immediate + * so add the pimreg. + * If the prefix list tells us to ACCEPT than + * we need to Never do the SPT so remove + * the interface + * + */ +void pim_upstream_remove_lhr_star_pimreg(struct pim_instance *pim, + const char *nlist) +{ + struct pim_upstream *up; + struct prefix_list *np; + struct prefix g; + enum prefix_list_type apply_new; + + np = prefix_list_lookup(PIM_AFI, nlist); + + frr_each (rb_pim_upstream, &pim->upstream_head, up) { + if (!pim_addr_is_any(up->sg.src)) + continue; + + if (!PIM_UPSTREAM_FLAG_TEST_CAN_BE_LHR(up->flags)) + continue; + + if (!nlist) { + pim_channel_del_oif(up->channel_oil, pim->regiface, + PIM_OIF_FLAG_PROTO_GM, __func__); + continue; + } + pim_addr_to_prefix(&g, up->sg.grp); + apply_new = prefix_list_apply_ext(np, NULL, &g, true); + if (apply_new == PREFIX_DENY) + pim_channel_add_oif(up->channel_oil, pim->regiface, + PIM_OIF_FLAG_PROTO_GM, __func__); + else + pim_channel_del_oif(up->channel_oil, pim->regiface, + PIM_OIF_FLAG_PROTO_GM, __func__); + } +} + +void pim_upstream_init(struct pim_instance *pim) +{ + char name[64]; + + snprintf(name, sizeof(name), "PIM %s Timer Wheel", pim->vrf->name); + pim->upstream_sg_wheel = + wheel_init(router->master, 31000, 100, pim_upstream_hash_key, + pim_upstream_sg_running, name); + + rb_pim_upstream_init(&pim->upstream_head); +} |