rtarget_group_mgr.cc

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/*
 * Copyright (c) 2013 Juniper Networks, Inc. All rights reserved.
 */
#include "bgp/routing-instance/rtarget_group_mgr.h"

#include <boost/foreach.hpp>

#include <utility>

#include "base/map_util.h"
#include "base/set_util.h"
#include "base/task_annotations.h"
#include "base/task_trigger.h"
#include "bgp/bgp_config.h"
#include "bgp/bgp_peer.h"
#include "bgp/bgp_ribout.h"
#include "bgp/bgp_server.h"
#include "bgp/bgp_table.h"
#include "bgp/routing-instance/routing_instance.h"
#include "bgp/rtarget/rtarget_route.h"

using std::pair;

void VpnRouteState::AddRouteTarget(RTargetGroupMgr *mgr, int part_id,
    BgpRoute *rt, RTargetList::const_iterator it) {
    pair<RTargetList::iterator, bool> result;
    result = list_.insert(*it);
    assert(result.second);
    RtGroup *rtgroup = mgr->LocateRtGroup(*it);
    rtgroup->AddDepRoute(part_id, rt);
}

void VpnRouteState::DeleteRouteTarget(RTargetGroupMgr *mgr, int part_id,
    BgpRoute *rt, RTargetList::const_iterator it) {
    RtGroup *rtgroup = mgr->GetRtGroup(*it);
    rtgroup->RemoveDepRoute(part_id, rt);
    mgr->RemoveRtGroup(*it);
    list_.erase(it);
}

void RTargetState::AddInterestedPeer(RTargetGroupMgr *mgr, RtGroup *rtgroup,
    RTargetRoute *rt, RtGroup::InterestedPeerList::const_iterator it) {
    pair<RtGroup::InterestedPeerList::iterator, bool> result;
    result = list_.insert(*it);
    assert(result.second);
    rtgroup->AddInterestedPeer(it->first, rt);
    mgr->NotifyRtGroupUnlocked(rtgroup->rt());
}

void RTargetState::DeleteInterestedPeer(RTargetGroupMgr *mgr, RtGroup *rtgroup,
    RTargetRoute *rt, RtGroup::InterestedPeerList::iterator it) {
    rtgroup->RemoveInterestedPeer(it->first, rt);
    mgr->NotifyRtGroupUnlocked(rtgroup->rt());
    list_.erase(it);
}

RTargetGroupMgr::RTargetGroupMgr(BgpServer *server) : server_(server),
    rtarget_route_trigger_(new TaskTrigger(
           boost::bind(&RTargetGroupMgr::ProcessRTargetRouteList, this),
           TaskScheduler::GetInstance()->GetTaskId("bgp::RTFilter"), 0)),
    remove_rtgroup_trigger_(new TaskTrigger(
           boost::bind(&RTargetGroupMgr::ProcessRtGroupList, this),
           TaskScheduler::GetInstance()->GetTaskId("bgp::RTFilter"), 0)),
    rtarget_trigger_lists_(DB::PartitionCount()),
    master_instance_delete_ref_(this, NULL) {
    for (int i = 0; i < DB::PartitionCount(); i++) {
        rtarget_dep_triggers_.push_back(boost::shared_ptr<TaskTrigger>(new
               TaskTrigger(boost::bind(&RTargetGroupMgr::ProcessRouteTargetList,
                                       this, i),
               TaskScheduler::GetInstance()->GetTaskId("db::DBTable"), i)));
    }
}

void RTargetGroupMgr::RTargetPeerSync(BgpTable *table, RTargetRoute *rt,
    DBTableBase::ListenerId id, RTargetState *dbstate,
    const RtGroup::InterestedPeerList *future) {
    CHECK_CONCURRENCY("bgp::RTFilter");

    RouteTarget rtarget = rt->GetPrefix().rtarget();
    RtGroup *rtgroup = LocateRtGroup(rtarget);
    assert(rtgroup);

    map_synchronize(dbstate->GetMutableList(), future,
        boost::bind(&RTargetState::AddInterestedPeer, dbstate, this, rtgroup,
            rt, _1),
        boost::bind(&RTargetState::DeleteInterestedPeer, dbstate, this, rtgroup,
            rt, _1));

    if (dbstate->GetList()->empty()) {
        rt->ClearState(table, id);
        delete dbstate;
        RemoveRtGroup(rtarget);
    }
}

void RTargetGroupMgr::BuildRTargetDistributionGraph(BgpTable *table,
    RTargetRoute *rt, DBTableBase::ListenerId id) {
    CHECK_CONCURRENCY("bgp::RTFilter");

    RTargetState *dbstate =
        static_cast<RTargetState *>(rt->GetState(table, id));

    RtGroup::InterestedPeerList peer_list;

    if (rt->IsDeleted() || !rt->BestPath() ||
        !rt->BestPath()->IsFeasible()) {
        RTargetPeerSync(table, rt, id, dbstate, &peer_list);
        return;
    }

    const BgpPath *best_ebgp_path = NULL;
    for (Route::PathList::iterator it = rt->GetPathList().begin();
         it != rt->GetPathList().end(); it++) {
        BgpPath *path = static_cast<BgpPath *>(it.operator->());
        if (!path->IsFeasible())
            break;
        if (!path->GetPeer() || path->GetPeer()->IsXmppPeer())
            continue;

        const BgpPeer *peer = static_cast<const BgpPeer *>(path->GetPeer());
        if (peer->PeerType() == BgpProto::EBGP) {
            if (!best_ebgp_path) {
                best_ebgp_path = path;
            } else if (!best_ebgp_path->PathSameNeighborAs(*path)) {
                continue;
            }
        }

        std::pair<RtGroup::InterestedPeerList::iterator, bool> ret =
            peer_list.insert(std::pair<const BgpPeer *,
                 RtGroup::RTargetRouteList>(peer, RtGroup::RTargetRouteList()));
        assert(ret.second);
        ret.first->second.insert(rt);
    }

    RTargetPeerSync(table, rt, id, dbstate, &peer_list);
}

bool RTargetGroupMgr::ProcessRouteTargetList(int part_id) {
    CHECK_CONCURRENCY("db::DBTable");

    BOOST_FOREACH(const RouteTarget &rtarget, rtarget_trigger_lists_[part_id]) {
        RtGroup *rtgroup = GetRtGroup(rtarget);
        if (!rtgroup)
            continue;
        rtgroup->NotifyDepRoutes(part_id);
    }

    rtarget_trigger_lists_[part_id].clear();
    return true;
}

void RTargetGroupMgr::AddRouteTargetToLists(const RouteTarget &rtarget) {
    for (int idx = 0; idx < DB::PartitionCount(); ++idx) {
        rtarget_trigger_lists_[idx].insert(rtarget);
        rtarget_dep_triggers_[idx]->Set();
    }
}

void RTargetGroupMgr::DisableRouteTargetProcessing() {
    for (int idx = 0; idx < DB::PartitionCount(); ++idx) {
        rtarget_dep_triggers_[idx]->set_disable();
    }
}

void RTargetGroupMgr::EnableRouteTargetProcessing() {
    for (int idx = 0; idx < DB::PartitionCount(); ++idx) {
        rtarget_dep_triggers_[idx]->set_enable();
    }
}

bool RTargetGroupMgr::IsRouteTargetOnList(const RouteTarget &rtarget) const {
    for (int idx = 0; idx < DB::PartitionCount(); ++idx) {
        if (rtarget_trigger_lists_[idx].find(rtarget) !=
            rtarget_trigger_lists_[idx].end()) {
            return true;
        }
    }
    return false;
}

bool RTargetGroupMgr::ProcessRTargetRouteList() {
    CHECK_CONCURRENCY("bgp::RTFilter");

    RoutingInstanceMgr *mgr = server()->routing_instance_mgr();
    RoutingInstance *master = mgr->GetDefaultRoutingInstance();
    BgpTable *table = master->GetTable(Address::RTARGET);

    // Get the Listener id
    DBTableBase::ListenerId id = GetListenerId(table);

    for (RTargetRouteTriggerList::iterator it = rtarget_route_list_.begin();
         it != rtarget_route_list_.end(); it++) {
        BuildRTargetDistributionGraph(table, *it, id);
    }

    rtarget_route_list_.clear();
    return true;
}

void RTargetGroupMgr::DisableRTargetRouteProcessing() {
    rtarget_route_trigger_->set_disable();
}

void RTargetGroupMgr::EnableRTargetRouteProcessing() {
    rtarget_route_trigger_->set_enable();
}

bool RTargetGroupMgr::IsRTargetRouteOnList(RTargetRoute *rt) const {
    return rtarget_route_list_.find(rt) != rtarget_route_list_.end();
}

void RTargetGroupMgr::Initialize() {
    assert(table_state_.empty());
    RoutingInstanceMgr *mgr = server()->routing_instance_mgr();
    RoutingInstance *master = mgr->GetDefaultRoutingInstance();
    assert(master);

    master_instance_delete_ref_.Reset(master->deleter());

    RoutingInstance::RouteTableList const table_list = master->GetTables();
    DBTableBase::ListenerId id;
    RtGroupMgrTableState *ts = NULL;
    for (RoutingInstance::RouteTableList::const_iterator it =
         table_list.begin(); it != table_list.end(); ++it) {
        if (!it->second->IsVpnTable()) continue;

        BgpTable *vpntable = it->second;
        id = vpntable->Register(
            boost::bind(&RTargetGroupMgr::VpnRouteNotify, this, _1, _2),
            "RTargetGroupMgr");
        ts = new RtGroupMgrTableState(vpntable, id);
        table_state_.insert(std::make_pair(vpntable, ts));
    }

    BgpTable *rttable = master->GetTable(Address::RTARGET);
    id = rttable->Register(
        boost::bind(&RTargetGroupMgr::RTargetRouteNotify, this, _1, _2),
        "RTargetGroupMgr");
    ts = new RtGroupMgrTableState(rttable, id);
    table_state_.insert(std::make_pair(rttable, ts));
}

void RTargetGroupMgr::ManagedDelete() {
    if (rtgroup_map_.empty()) remove_rtgroup_trigger_->Set();
}

void
RTargetGroupMgr::RTargetDepSync(DBTablePartBase *root, BgpRoute *rt,
                                DBTableBase::ListenerId id,
                                VpnRouteState *dbstate,
                                const VpnRouteState::RTargetList *future) {
    CHECK_CONCURRENCY("db::DBTable");

    BgpTable *table = static_cast<BgpTable *>(root->parent());
    if (!dbstate) {
        dbstate = new VpnRouteState();
        rt->SetState(table, id, dbstate);
    }

    int part_id = root->index();
    set_synchronize(dbstate->GetMutableList(), future,
        boost::bind(
            &VpnRouteState::AddRouteTarget, dbstate, this, part_id, rt, _1),
        boost::bind(
            &VpnRouteState::DeleteRouteTarget, dbstate, this, part_id, rt, _1));

    if (dbstate->GetList()->empty()) {
        rt->ClearState(root->parent(), id);
        delete dbstate;
    }
}

DBTableBase::ListenerId RTargetGroupMgr::GetListenerId(BgpTable *table) {
    RtGroupMgrTableStateList::iterator loc = table_state_.find(table);
    assert(loc != table_state_.end());
    RtGroupMgrTableState *ts = loc->second;
    DBTableBase::ListenerId id = ts->GetListenerId();
    assert(id != DBTableBase::kInvalidId);
    return id;
}

bool RTargetGroupMgr::VpnRouteNotify(DBTablePartBase *root,
                                     DBEntryBase *entry) {
    CHECK_CONCURRENCY("db::DBTable");

    BgpTable *table = static_cast<BgpTable *>(root->parent());
    BgpRoute *rt = static_cast<BgpRoute *>(entry);
    // Get the Listener id
    DBTableBase::ListenerId id = GetListenerId(table);

    // Get the dbstate
    VpnRouteState *dbstate =
        static_cast<VpnRouteState *>(rt->GetState(table, id));

    VpnRouteState::RTargetList list;

    if (entry->IsDeleted() || !rt->BestPath() ||
        !rt->BestPath()->IsFeasible()) {
        if (!dbstate)
            return true;
        RTargetDepSync(root, rt, id, dbstate, &list);
        return true;
    }

    const BgpPath *path = rt->BestPath();
    const BgpAttr *attr = path->GetAttr();
    const ExtCommunity *ext_community = attr->ext_community();

    if (ext_community) {
        // Gather all Route Target
        BOOST_FOREACH(const ExtCommunity::ExtCommunityValue &comm,
                      ext_community->communities()) {
            if (ExtCommunity::is_route_target(comm)) {
                list.insert(RouteTarget(comm));
            }
        }
    }

    RTargetDepSync(root, rt, id, dbstate, &list);
    return true;
}

bool RTargetGroupMgr::RTargetRouteNotify(DBTablePartBase *root,
                                         DBEntryBase *entry) {
    CHECK_CONCURRENCY("db::DBTable");

    BgpTable *table = static_cast<BgpTable *>(root->parent());
    RTargetRoute *rt = static_cast<RTargetRoute *>(entry);
    // Get the Listener id
    DBTableBase::ListenerId id = GetListenerId(table);

    // Get the dbstate
    RTargetState *dbstate =
        static_cast<RTargetState *>(rt->GetState(table, id));

    if (!dbstate) {
        if (rt->IsDeleted()) return true;
        dbstate = new RTargetState();
        rt->SetState(table, id, dbstate);
    }
    if (rtarget_route_list_.empty())
        rtarget_route_trigger_->Set();
    rtarget_route_list_.insert(rt);
    return true;
}

RTargetGroupMgr::~RTargetGroupMgr() {
    assert(rtgroup_map_.empty());
}

// Search a RtGroup
RtGroup *RTargetGroupMgr::GetRtGroup(const RouteTarget &rt) {
    tbb::mutex::scoped_lock lock(mutex_);
    RtGroupMap::iterator loc = rtgroup_map_.find(rt);
    if (loc != rtgroup_map_.end()) {
        return loc->second;
    }
    return NULL;
}

// Search a RtGroup
RtGroup *RTargetGroupMgr::GetRtGroup(const ExtCommunity::ExtCommunityValue
                                        &community) {
    RouteTarget rt(community);
    return GetRtGroup(rt);
}

RtGroup *RTargetGroupMgr::LocateRtGroup(const RouteTarget &rt) {
    tbb::mutex::scoped_lock lock(mutex_);
    RtGroupMap::iterator loc = rtgroup_map_.find(rt);
    RtGroup *group = (loc != rtgroup_map_.end()) ? loc->second : NULL;
    if (group == NULL) {
        group = new RtGroup(rt);
        rtgroup_map_.insert(rt, group);
    }
    return group;
}

void RTargetGroupMgr::NotifyRtGroupUnlocked(const RouteTarget &rt) {
    CHECK_CONCURRENCY("bgp::RTFilter", "bgp::Config", "bgp::ConfigHelper");

    AddRouteTargetToLists(rt);
    if (!rt.IsNull())
        return;

    for (RtGroupMgrTableStateList::iterator it = table_state_.begin();
         it != table_state_.end(); ++it) {
        BgpTable *table = it->first;
        if (!table->IsVpnTable())
            continue;
        table->NotifyAllEntries();
    }
}

void RTargetGroupMgr::NotifyRtGroup(const RouteTarget &rt) {
    CHECK_CONCURRENCY("bgp::Config", "bgp::ConfigHelper");
    tbb::mutex::scoped_lock lock(mutex_);
    NotifyRtGroupUnlocked(rt);
}

void RTargetGroupMgr::RemoveRtGroup(const RouteTarget &rt) {
    tbb::mutex::scoped_lock lock(mutex_);
    RtGroupMap::iterator loc = rtgroup_map_.find(rt);
    RtGroup *rtgroup = (loc != rtgroup_map_.end()) ? loc->second : NULL;
    assert(rtgroup);

    rtgroup_remove_list_.insert(rtgroup);
    remove_rtgroup_trigger_->Set();
}

void RTargetGroupMgr::GetRibOutInterestedPeers(RibOut *ribout,
             const ExtCommunity *ext_community,
             const RibPeerSet &peerset, RibPeerSet *new_peerset) {
    RtGroupInterestedPeerSet peer_set;
    RtGroup *null_rtgroup = GetRtGroup(RouteTarget::null_rtarget);
    if (null_rtgroup) peer_set = null_rtgroup->GetInterestedPeers();
    BOOST_FOREACH(const ExtCommunity::ExtCommunityValue &comm,
                  ext_community->communities()) {
        if (ExtCommunity::is_route_target(comm)) {
            RtGroup *rtgroup = GetRtGroup(comm);
            if (!rtgroup) continue;
            peer_set |= rtgroup->GetInterestedPeers();
        }
    }
    RibOut::PeerIterator iter(ribout, peerset);
    while (iter.HasNext()) {
        int current_index = iter.index();
        IPeerUpdate *peer = iter.Next();
        BgpPeer *tmp = dynamic_cast<BgpPeer *>(peer);
        assert(tmp);
        if (tmp->IsFamilyNegotiated(Address::RTARGET)) {
            if (!peer_set.test(tmp->GetIndex())) {
                new_peerset->reset(current_index);
            }
        }
    }
}

void RTargetGroupMgr::UnregisterTables() {
    CHECK_CONCURRENCY("bgp::RTFilter");

    if (rtgroup_map_.empty()) {
        RoutingInstanceMgr *mgr = server()->routing_instance_mgr();
        RoutingInstance *master = mgr->GetDefaultRoutingInstance();
        if (master && master->deleted()) {
            for (RtGroupMgrTableStateList::iterator it =
                 table_state_.begin(), itnext; it != table_state_.end();
                 it = itnext) {
                itnext = it;
                itnext++;
                RtGroupMgrTableState *ts = it->second;
                DBTableBase::ListenerId id = ts->GetListenerId();
                BgpTable *bgptable = it->first;
                bgptable->Unregister(id);
                table_state_.erase(it);
                delete ts;
            }
            master_instance_delete_ref_.Reset(NULL);
        }
    }
}

bool RTargetGroupMgr::ProcessRtGroupList() {
    CHECK_CONCURRENCY("bgp::RTFilter");
    BOOST_FOREACH(RtGroup *rtgroup, rtgroup_remove_list_) {
        if (!rtgroup->MayDelete())
            continue;
        RouteTarget rt = rtgroup->rt();
        rtgroup_map_.erase(rt);
    }
    rtgroup_remove_list_.clear();

    if (rtgroup_map_.empty()) UnregisterTables();

    return true;
}

void RTargetGroupMgr::DisableRtGroupProcessing() {
    remove_rtgroup_trigger_->set_disable();
}

void RTargetGroupMgr::EnableRtGroupProcessing() {
    remove_rtgroup_trigger_->set_enable();
}

bool RTargetGroupMgr::IsRtGroupOnList(RtGroup *rtgroup) const {
    return rtgroup_remove_list_.find(rtgroup) != rtgroup_remove_list_.end();
}

RtGroupMgrTableState::RtGroupMgrTableState(BgpTable *table,
                                           DBTableBase::ListenerId id)
    : id_(id), table_delete_ref_(this, table->deleter()) {
    assert(table->deleter() != NULL);
}

RtGroupMgrTableState::~RtGroupMgrTableState() {
}

void RtGroupMgrTableState::ManagedDelete() {
}