/
bgp_peer.cc
1925 lines (1661 loc) · 61.7 KB
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bgp_peer.cc
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/*
* Copyright (c) 2013 Juniper Networks, Inc. All rights reserved.
*/
#include "bgp/bgp_peer.h"
#include <boost/assign/list_of.hpp>
#include <boost/foreach.hpp>
#include <boost/tuple/tuple.hpp>
#include <algorithm>
#include <map>
#include "base/task_annotations.h"
#include "bgp/bgp_factory.h"
#include "bgp/bgp_log.h"
#include "bgp/bgp_peer_membership.h"
#include "bgp/bgp_sandesh.h"
#include "bgp/bgp_server.h"
#include "bgp/bgp_session.h"
#include "bgp/bgp_session_manager.h"
#include "bgp/bgp_peer_types.h"
#include "bgp/ermvpn/ermvpn_table.h"
#include "bgp/evpn/evpn_table.h"
#include "bgp/inet/inet_table.h"
#include "bgp/inet6/inet6_table.h"
#include "bgp/inet6vpn/inet6vpn_table.h"
#include "bgp/l3vpn/inetvpn_table.h"
#include "bgp/routing-instance/peer_manager.h"
#include "bgp/routing-instance/routing_instance.h"
#include "bgp/rtarget/rtarget_table.h"
using boost::assign::list_of;
using boost::assign::map_list_of;
using boost::system::error_code;
using boost::tie;
using std::dec;
using std::map;
using std::ostringstream;
using std::string;
using std::vector;
class BgpPeer::PeerClose : public IPeerClose {
public:
explicit PeerClose(BgpPeer *peer)
: peer_(peer),
is_closed_(false),
manager_(BgpObjectFactory::Create<PeerCloseManager>(peer_)) {
}
virtual ~PeerClose() {
}
virtual string ToString() const {
return peer_->ToString();
}
// If the peer is deleted or administratively held down, do not attempt
// graceful restart
virtual bool IsCloseGraceful() {
if (peer_->IsDeleted() || peer_->IsAdminDown())
return false;
return peer_->server()->IsPeerCloseGraceful();
}
virtual void CustomClose() { return peer_->CustomClose(); }
virtual void GracefulRestartStale() { }
virtual void GracefulRestartSweep() { }
// CloseComplete
//
// Close process for this peer is complete. Restart the state machine and
// attempt to bring up session with the neighbor
//
virtual void CloseComplete() {
peer_->server()->decrement_closing_count();
if (!peer_->IsAdminDown())
peer_->state_machine_->Initialize();
}
virtual void Delete() {
if (!peer_->IsDeleted()) {
CloseComplete();
return;
}
peer_->server()->decrement_closing_count();
peer_->deleter()->RetryDelete();
is_closed_ = true;
}
bool IsClosed() const { return is_closed_; }
virtual PeerCloseManager *close_manager() { return manager_.get(); }
void Close() {
if (!manager_->IsCloseInProgress())
peer_->server()->increment_closing_count();
manager_->Close();
}
private:
BgpPeer *peer_;
bool is_closed_;
boost::scoped_ptr<PeerCloseManager> manager_;
};
class BgpPeer::PeerStats : public IPeerDebugStats {
public:
explicit PeerStats(BgpPeer *peer)
: peer_(peer) {
}
// Used when peer flaps.
// Reset all counters.
// Socket counters are implicitly cleared because we use a new socket.
virtual void Clear() {
error_stats_ = ErrorStats();
proto_stats_[0] = ProtoStats();
proto_stats_[1] = ProtoStats();
update_stats_[0] = UpdateStats();
update_stats_[1] = UpdateStats();
}
// Printable name
virtual string ToString() const {
return peer_->ToString();
}
// Previous State of the peer
virtual string last_state() const {
return peer_->state_machine()->LastStateName();
}
virtual string last_state_change_at() const {
return peer_->state_machine()->last_state_change_at();
}
// Last error on this peer
virtual string last_error() const {
return peer_->state_machine()->last_notification_in_error();
}
// Last Event on this peer
virtual string last_event() const {
return peer_->state_machine()->last_event();
}
// When was the Last
virtual string last_flap() const {
return peer_->last_flap_at();
}
// Total number of flaps
virtual uint64_t num_flaps() const {
return peer_->flap_count();
}
virtual void GetRxProtoStats(ProtoStats *stats) const {
*stats = proto_stats_[0];
}
virtual void GetTxProtoStats(ProtoStats *stats) const {
*stats = proto_stats_[1];
}
virtual void GetRxRouteUpdateStats(UpdateStats *stats) const {
*stats = update_stats_[0];
}
virtual void GetTxRouteUpdateStats(UpdateStats *stats) const {
*stats = update_stats_[1];
}
virtual void GetRxSocketStats(IPeerDebugStats::SocketStats *stats) const {
if (peer_->session()) {
io::SocketStats socket_stats(peer_->session()->GetSocketStats());
stats->calls = socket_stats.read_calls;
stats->bytes = socket_stats.read_bytes;
}
}
virtual void GetTxSocketStats(IPeerDebugStats::SocketStats *stats) const {
if (peer_->session()) {
io::SocketStats socket_stats(peer_->session()->GetSocketStats());
stats->calls = socket_stats.write_calls;
stats->bytes = socket_stats.write_bytes;
stats->blocked_count = socket_stats.write_blocked;
stats->blocked_duration_usecs =
socket_stats.write_blocked_duration_usecs;
}
}
virtual void UpdateTxUnreachRoute(uint64_t count) {
update_stats_[1].unreach += count;
}
virtual void UpdateTxReachRoute(uint64_t count) {
update_stats_[1].reach += count;
}
// Do nothing for bgp peers.
virtual void GetRxErrorStats(RxErrorStats *stats) const {
}
private:
friend class BgpPeer;
BgpPeer *peer_;
ErrorStats error_stats_;
ProtoStats proto_stats_[2];
UpdateStats update_stats_[2];
};
class BgpPeer::DeleteActor : public LifetimeActor {
public:
explicit DeleteActor(BgpPeer *peer)
: LifetimeActor(peer->server_->lifetime_manager()),
peer_(peer) {
}
virtual bool MayDelete() const {
CHECK_CONCURRENCY("bgp::Config");
if (!peer_->peer_close_->IsClosed())
return false;
if (!peer_->state_machine_->IsQueueEmpty())
return false;
return true;
}
virtual void Shutdown() {
CHECK_CONCURRENCY("bgp::Config");
peer_->Clear(BgpProto::Notification::PeerDeconfigured);
}
virtual void Destroy() {
CHECK_CONCURRENCY("bgp::Config");
peer_->PostCloseRelease();
peer_->rtinstance_->peer_manager()->DestroyIPeer(peer_);
}
private:
BgpPeer *peer_;
};
//
// Constructor for BgpPeerFamilyAttributes.
//
BgpPeerFamilyAttributes::BgpPeerFamilyAttributes(
const BgpNeighborConfig *config,
const BgpFamilyAttributesConfig &family_config) {
if (family_config.loop_count) {
loop_count = family_config.loop_count;
} else {
loop_count = config->loop_count();
}
prefix_limit = family_config.prefix_limit;
}
void BgpPeer::ReceiveEndOfRIB(Address::Family family, size_t msgsize) {
inc_rx_end_of_rib();
BGP_LOG_PEER(Message, this, SandeshLevel::SYS_INFO,
BGP_LOG_FLAG_SYSLOG, BGP_PEER_DIR_IN,
"EndOfRib marker family " << Address::FamilyToString(family) <<
" size " << msgsize);
if (family != Address::RTARGET)
return;
end_of_rib_timer_->Cancel();
RegisterToVpnTables();
}
void BgpPeer::SendEndOfRIB(Address::Family family) {
tbb::spin_mutex::scoped_lock lock(spin_mutex_);
// Bail if there's no session for the peer anymore.
if (!session_)
return;
BgpProto::Update update;
uint16_t afi;
uint8_t safi;
tie(afi, safi) = BgpAf::FamilyToAfiSafi(family);
BgpMpNlri *nlri = new BgpMpNlri(BgpAttribute::MPUnreachNlri, afi, safi);
update.path_attributes.push_back(nlri);
uint8_t data[256];
int msgsize = BgpProto::Encode(&update, data, sizeof(data));
assert(msgsize > BgpProto::kMinMessageSize);
session_->Send(data, msgsize, NULL);
inc_tx_end_of_rib();
inc_tx_update();
BGP_LOG_PEER(Message, this, SandeshLevel::SYS_INFO,
BGP_LOG_FLAG_SYSLOG, BGP_PEER_DIR_OUT,
"EndOfRib marker family " << Address::FamilyToString(family) <<
" size " << msgsize);
}
//
// Callback from PeerRibMembershipManager.
// Update pending membership request count and send EndOfRib for the family
// in question.
//
void BgpPeer::MembershipRequestCallback(IPeer *ipeer, BgpTable *table) {
assert(membership_req_pending_);
membership_req_pending_--;
// Resume close if it was deferred and this is the last pending callback.
// Don't bother sending EndOfRib if close is deferred.
if (defer_close_) {
if (!membership_req_pending_) {
defer_close_ = false;
trigger_.Set();
}
return;
}
BgpPeerInfoData peer_info;
peer_info.set_name(ToUVEKey());
peer_info.set_send_state("in sync");
BGPPeerInfo::Send(peer_info);
SendEndOfRIB(table->family());
}
bool BgpPeer::ResumeClose() {
peer_close_->Close();
BgpPeerInfoData peer_info;
peer_info.set_name(ToUVEKey());
peer_info.set_send_state("not advertising");
BGPPeerInfo::Send(peer_info);
return true;
}
BgpPeer::BgpPeer(BgpServer *server, RoutingInstance *instance,
const BgpNeighborConfig *config)
: server_(server),
rtinstance_(instance),
peer_key_(config),
peer_port_(config->source_port()),
peer_name_(config->name()),
router_type_(config->router_type()),
config_(config),
index_(server->RegisterPeer(this)),
trigger_(boost::bind(&BgpPeer::ResumeClose, this),
TaskScheduler::GetInstance()->GetTaskId("bgp::StateMachine"),
GetIndex()),
session_(NULL),
keepalive_timer_(TimerManager::CreateTimer(*server->ioservice(),
"BGP keepalive timer")),
end_of_rib_timer_(TimerManager::CreateTimer(*server->ioservice(),
"BGP RTarget EndOfRib timer",
TaskScheduler::GetInstance()->GetTaskId("bgp::StateMachine"),
GetIndex())),
send_ready_(true),
admin_down_(config->admin_down()),
passive_(config->passive()),
resolve_paths_(config->router_type() == "bgpaas-client"),
membership_req_pending_(0),
defer_close_(false),
vpn_tables_registered_(false),
hold_time_(config->hold_time()),
local_as_(config->local_as()),
peer_as_(config->peer_as()),
local_bgp_id_(config->local_identifier()),
peer_bgp_id_(0),
peer_type_((config->peer_as() == config->local_as()) ?
BgpProto::IBGP : BgpProto::EBGP),
policy_((config->peer_as() == config->local_as()) ?
BgpProto::IBGP : BgpProto::EBGP,
RibExportPolicy::BGP, config->peer_as(), -1, 0),
state_machine_(BgpObjectFactory::Create<StateMachine>(this)),
peer_close_(new PeerClose(this)),
peer_stats_(new PeerStats(this)),
deleter_(new DeleteActor(this)),
instance_delete_ref_(this, instance->deleter()),
flap_count_(0),
last_flap_(0),
inuse_authkey_type_(AuthenticationData::NIL) {
BGP_LOG_PEER(Event, this, SandeshLevel::SYS_INFO, BGP_LOG_FLAG_ALL,
BGP_PEER_DIR_NA, "Created");
if (peer_name_.find(rtinstance_->name()) == 0) {
peer_basename_ = peer_name_.substr(rtinstance_->name().size() + 1);
} else {
peer_basename_ = peer_name_;
}
refcount_ = 0;
primary_path_count_ = 0;
ProcessEndpointConfig(config);
ProcessAuthKeyChainConfig(config);
ProcessFamilyAttributesConfig(config);
BgpPeerInfoData peer_info;
peer_info.set_name(ToUVEKey());
peer_info.set_admin_down(admin_down_);
peer_info.set_passive(passive_);
peer_info.set_router_type(router_type_);
peer_info.set_peer_type(
PeerType() == BgpProto::IBGP ? "internal" : "external");
peer_info.set_local_asn(local_as_);
peer_info.set_peer_asn(peer_as_);
peer_info.set_peer_port(peer_port_);
peer_info.set_hold_time(hold_time_);
peer_info.set_local_id(local_bgp_id_);
peer_info.set_configured_families(config->GetAddressFamilies());
peer_info.set_peer_address(peer_key_.endpoint.address().to_string());
BGPPeerInfo::Send(peer_info);
}
BgpPeer::~BgpPeer() {
assert(GetRefCount() == 0);
STLDeleteValues(&family_attributes_list_);
ClearListenSocketAuthKey();
BgpPeerInfoData peer_info;
peer_info.set_name(ToUVEKey());
peer_info.set_deleted(true);
BGPPeerInfo::Send(peer_info);
BGP_LOG_PEER(Event, this, SandeshLevel::SYS_INFO, BGP_LOG_FLAG_ALL,
BGP_PEER_DIR_NA, "Deleted");
}
void BgpPeer::Initialize() {
if (!admin_down_)
state_machine_->Initialize();
}
void BgpPeer::BindLocalEndpoint(BgpSession *session) {
}
// Just return the first entry for now.
bool BgpPeer::GetBestAuthKey(AuthenticationKey *auth_key,
KeyType *key_type) const {
if (auth_data_.Empty()) {
return false;
}
assert(auth_key);
AuthenticationData::const_iterator iter = auth_data_.begin();
*auth_key = *iter;
*key_type = auth_data_.key_type();
return true;
}
bool BgpPeer::ProcessAuthKeyChainConfig(const BgpNeighborConfig *config) {
const AuthenticationData &input_auth_data = config->auth_data();
if (auth_data_ == input_auth_data) {
return false;
}
auth_data_ = input_auth_data;
return InstallAuthKeys();
}
bool BgpPeer::InstallAuthKeys() {
if (!PeerAddress()) {
return false;
}
AuthenticationKey auth_key;
KeyType key_type;
bool valid = GetBestAuthKey(&auth_key, &key_type);
if (valid) {
if (key_type == AuthenticationData::MD5) {
LogInstallAuthKeys("Listen", "add", auth_key, key_type);
SetListenSocketAuthKey(auth_key, key_type);
SetInuseAuthKeyInfo(auth_key, key_type);
}
} else {
// If there are no valid available keys but an older one is currently
// installed, un-install it.
if (inuse_authkey_type_ == AuthenticationData::MD5) {
LogInstallAuthKeys("Listen", "delete", inuse_auth_key_,
inuse_authkey_type_);
ClearListenSocketAuthKey();
// Resetting the key information must be done last.
ResetInuseAuthKeyInfo();
}
}
return true;
}
void BgpPeer::SetInuseAuthKeyInfo(const AuthenticationKey &key, KeyType type) {
inuse_auth_key_ = key;
inuse_authkey_type_ = type;
}
void BgpPeer::ResetInuseAuthKeyInfo() {
inuse_auth_key_.Reset();
inuse_authkey_type_ = AuthenticationData::NIL;
}
void BgpPeer::SetListenSocketAuthKey(const AuthenticationKey &auth_key,
KeyType key_type) {
if (key_type == AuthenticationData::MD5) {
server_->session_manager()->
SetListenSocketMd5Option(PeerAddress(), auth_key.value);
}
}
void BgpPeer::ClearListenSocketAuthKey() {
if (inuse_authkey_type_ == AuthenticationData::MD5) {
server_->session_manager()->SetListenSocketMd5Option(PeerAddress(), "");
}
}
void BgpPeer::SetSessionSocketAuthKey(TcpSession *session) {
if ((inuse_authkey_type_ == AuthenticationData::MD5) && PeerAddress()) {
assert(!inuse_auth_key_.value.empty());
LogInstallAuthKeys("Session", "add", inuse_auth_key_,
inuse_authkey_type_);
session->SetMd5SocketOption(PeerAddress(), inuse_auth_key_.value);
}
}
string BgpPeer::GetInuseAuthKeyValue() const {
return inuse_auth_key_.value;
}
void BgpPeer::LogInstallAuthKeys(const string &socket_name,
const string &oper, const AuthenticationKey &auth_key,
KeyType key_type) {
string logstr = socket_name + " socket kernel " + oper + " of key id "
+ integerToString(auth_key.id) + ", type "
+ AuthenticationData::KeyTypeToString(key_type)
+ ", peer " + peer_name_;
BGP_LOG_PEER(Config, this, SandeshLevel::SYS_INFO, BGP_LOG_FLAG_ALL,
BGP_PEER_DIR_NA, logstr);
}
//
// Process family attributes configuration and update the family attributes
// list.
//
// Return true is there's a change, false otherwise.
//
bool BgpPeer::ProcessFamilyAttributesConfig(const BgpNeighborConfig *config) {
FamilyAttributesList family_attributes_list(Address::NUM_FAMILIES);
BOOST_FOREACH(const BgpFamilyAttributesConfig family_config,
config->family_attributes_list()) {
Address::Family family =
Address::FamilyFromString(family_config.family);
assert(family != Address::UNSPEC);
BgpPeerFamilyAttributes *family_attributes =
new BgpPeerFamilyAttributes(config, family_config);
family_attributes_list[family] = family_attributes;
}
int ret = STLSortedCompare(
family_attributes_list.begin(), family_attributes_list.end(),
family_attributes_list_.begin(), family_attributes_list_.end(),
BgpPeerFamilyAttributesCompare());
STLDeleteValues(&family_attributes_list_);
family_attributes_list_ = family_attributes_list;
configured_families_ = config->GetAddressFamilies();
return (ret != 0);
}
void BgpPeer::ProcessEndpointConfig(const BgpNeighborConfig *config) {
if (config->router_type() == "bgpaas-client") {
endpoint_ = TcpSession::Endpoint(Ip4Address(), config->source_port());
} else {
endpoint_ = TcpSession::Endpoint();
}
}
void BgpPeer::ConfigUpdate(const BgpNeighborConfig *config) {
if (IsDeleted())
return;
config_ = config;
// During peer deletion, configuration gets completely deleted. In that
// case, there is no need to update the rest and flap the peer.
if (!config_)
return;
bool clear_session = false;
bool admin_down_changed = false;
BgpPeerInfoData peer_info;
peer_info.set_name(ToUVEKey());
if (admin_down_ != config->admin_down()) {
SetAdminState(config->admin_down());
peer_info.set_admin_down(admin_down_);
admin_down_changed = true;
}
if (passive_ != config->passive()) {
passive_ = config->passive();
peer_info.set_passive(passive_);
clear_session = true;
}
if (router_type_ != config->router_type()) {
router_type_ = config->router_type();
peer_info.set_router_type(router_type_);
resolve_paths_ = (config->router_type() == "bgpaas-client"),
clear_session = true;
}
// Check if there is any change in the peer address.
// If the peer address is changing, remove the key for the older address.
// Update with the new peer address and then process the key chain info
// for the new peer below.
BgpPeerKey key(config);
if (peer_key_ != key) {
ClearListenSocketAuthKey();
peer_key_ = key;
peer_info.set_peer_address(peer_key_.endpoint.address().to_string());
clear_session = true;
}
if (ProcessAuthKeyChainConfig(config)) {
clear_session = true;
}
if (peer_port_ != config->source_port()) {
peer_port_ = config->source_port();
peer_info.set_peer_port(peer_port_);
clear_session = true;
}
ProcessEndpointConfig(config);
// Check if there is any change in the configured address families.
if (ProcessFamilyAttributesConfig(config)) {
peer_info.set_configured_families(configured_families_);
clear_session = true;
}
BgpProto::BgpPeerType old_type = PeerType();
if (local_as_ != config->local_as()) {
local_as_ = config->local_as();
peer_info.set_local_asn(local_as_);
clear_session = true;
}
if (hold_time_ != config->hold_time()) {
hold_time_ = config->hold_time();
peer_info.set_hold_time(hold_time_);
clear_session = true;
}
if (peer_as_ != config->peer_as()) {
peer_as_ = config->peer_as();
peer_info.set_peer_asn(peer_as_);
clear_session = true;
}
boost::system::error_code ec;
uint32_t local_bgp_id = config->local_identifier();
if (local_bgp_id_ != local_bgp_id) {
local_bgp_id_ = local_bgp_id;
peer_info.set_local_id(local_bgp_id_);
clear_session = true;
}
peer_type_ = (peer_as_ == local_as_) ? BgpProto::IBGP : BgpProto::EBGP;
if (old_type != PeerType()) {
peer_info.set_peer_type(
PeerType() == BgpProto::IBGP ? "internal" : "external");
policy_.type = peer_type_;
policy_.as_number = peer_as_;
clear_session = true;
}
// Note that the state machine would have been stopped via SetAdminDown
// if admin down was set to true above. Further, it's not necessary to
// clear the peer if it's already admin down.
if (!admin_down_changed && !admin_down_ && clear_session) {
BGP_LOG_PEER(Config, this, SandeshLevel::SYS_INFO, BGP_LOG_FLAG_ALL,
BGP_PEER_DIR_NA,
"Session cleared due to configuration change");
Clear(BgpProto::Notification::OtherConfigChange);
}
// Send the UVE as appropriate.
if (admin_down_changed || clear_session) {
BGPPeerInfo::Send(peer_info);
}
}
void BgpPeer::ClearConfig() {
CHECK_CONCURRENCY("bgp::Config");
config_ = NULL;
}
LifetimeActor *BgpPeer::deleter() {
return deleter_.get();
}
//
// Check if the given address family has been negotiated with the peer.
//
bool BgpPeer::IsFamilyNegotiated(Address::Family family) {
// Bail if the family is not configured locally.
if (!LookupFamily(family))
return false;
// Check if the peer advertised it in his Open message.
uint16_t afi;
uint8_t safi;
tie(afi, safi) = BgpAf::FamilyToAfiSafi(family);
return MpNlriAllowed(afi, safi);
}
// Release resources for a peer that is going to be deleted.
void BgpPeer::PostCloseRelease() {
if (index_ != -1) {
server_->UnregisterPeer(this);
index_ = -1;
}
TimerManager::DeleteTimer(keepalive_timer_);
TimerManager::DeleteTimer(end_of_rib_timer_);
}
// IsReady
//
// Check whether this peer is up and ready
//
bool BgpPeer::IsReady() const {
return state_machine_->get_state() == StateMachine::ESTABLISHED;
}
bool BgpPeer::IsXmppPeer() const {
return false;
}
uint32_t BgpPeer::local_bgp_identifier() const {
return ntohl(local_bgp_id_);
}
string BgpPeer::local_bgp_identifier_string() const {
return Ip4Address(ntohl(local_bgp_id_)).to_string();
}
uint32_t BgpPeer::bgp_identifier() const {
return ntohl(peer_bgp_id_);
}
string BgpPeer::bgp_identifier_string() const {
return Ip4Address(ntohl(peer_bgp_id_)).to_string();
}
string BgpPeer::transport_address_string() const {
TcpSession::Endpoint endpoint;
ostringstream oss;
if (session_)
endpoint = session_->remote_endpoint();
oss << endpoint;
return oss.str();
}
//
// Customized close routing for BgpPeers.
//
// Reset all stored capabilities information and cancel outstanding timers.
//
void BgpPeer::CustomClose() {
negotiated_families_.clear();
ResetCapabilities();
keepalive_timer_->Cancel();
end_of_rib_timer_->Cancel();
}
//
// Close this peer by closing all of it's RIBs.
//
void BgpPeer::Close() {
if (membership_req_pending_) {
BGP_LOG_PEER(Event, this, SandeshLevel::SYS_INFO, BGP_LOG_FLAG_ALL,
BGP_PEER_DIR_NA, "Close procedure deferred");
defer_close_ = true;
return;
}
peer_close_->Close();
BgpPeerInfoData peer_info;
peer_info.set_name(ToUVEKey());
peer_info.set_send_state("not advertising");
BGPPeerInfo::Send(peer_info);
}
IPeerClose *BgpPeer::peer_close() {
return peer_close_.get();
}
IPeerDebugStats *BgpPeer::peer_stats() {
return peer_stats_.get();
}
const IPeerDebugStats *BgpPeer::peer_stats() const {
return peer_stats_.get();
}
void BgpPeer::Clear(int subcode) {
CHECK_CONCURRENCY("bgp::Config");
state_machine_->Shutdown(subcode);
}
//
// Check whether this peer has been marked for deletion from configuration
//
bool BgpPeer::IsDeleted() const {
return deleter_->IsDeleted();
}
bool BgpPeer::IsCloseInProgress() const {
return (defer_close_ || peer_close_->close_manager()->IsCloseInProgress());
}
StateMachine::State BgpPeer::GetState() const {
return state_machine_->get_state();
}
const string BgpPeer::GetStateName() const {
return state_machine_->StateName();
}
BgpSession *BgpPeer::CreateSession() {
TcpSession *session = server_->session_manager()->CreateSession();
if (session == NULL) {
return NULL;
}
// Set valid keys, if any, in the socket.
SetSessionSocketAuthKey(session);
BgpSession *bgp_session = static_cast<BgpSession *>(session);
BindLocalEndpoint(bgp_session);
bgp_session->set_peer(this);
return bgp_session;
}
void BgpPeer::SetAdminState(bool down) {
if (admin_down_ == down)
return;
admin_down_ = down;
state_machine_->SetAdminState(down);
if (admin_down_) {
BGP_LOG_PEER(Config, this, SandeshLevel::SYS_INFO, BGP_LOG_FLAG_ALL,
BGP_PEER_DIR_NA, "Session cleared due to admin down");
}
}
bool BgpPeer::AcceptSession(BgpSession *session) {
session->set_peer(this);
// Set valid keys, if any, in the socket.
SetSessionSocketAuthKey(session);
return state_machine_->PassiveOpen(session);
}
//
// Register to tables for negotiated address families.
//
// If the route-target family is negotiated, defer ribout registration
// to VPN tables till we receive End-Of-RIB marker for the route-target
// NLRI or till the EndOfRibTimer expires. This ensures that we do not
// start sending VPN routes to the peer till we know what route targets
// the peer is interested in.
//
// Note that we do ribin registration right away even if the route-target
// family is negotiated. This allows received VPN routes to be processed
// normally before ribout registration to VPN tables is completed.
//
void BgpPeer::RegisterAllTables() {
PeerRibMembershipManager *membership_mgr = server_->membership_mgr();
RoutingInstance *instance = GetRoutingInstance();
BGP_LOG_PEER(Event, this, SandeshLevel::SYS_INFO, BGP_LOG_FLAG_ALL,
BGP_PEER_DIR_NA, "Established");
BgpPeerInfoData peer_info;
peer_info.set_name(ToUVEKey());
peer_info.set_send_state("not advertising");
BGPPeerInfo::Send(peer_info);
vector<Address::Family> family_list = list_of
(Address::INET)(Address::INET6);
BOOST_FOREACH(Address::Family family, family_list) {
if (!IsFamilyNegotiated(family))
continue;
BgpTable *table = instance->GetTable(family);
BGP_LOG_PEER_TABLE(this, SandeshLevel::SYS_DEBUG, BGP_LOG_FLAG_TRACE,
table, "Register peer with the table");
membership_mgr->Register(this, table, policy_, -1,
boost::bind(&BgpPeer::MembershipRequestCallback, this, _1, _2));
membership_req_pending_++;
}
vpn_tables_registered_ = false;
if (!IsFamilyNegotiated(Address::RTARGET)) {
RegisterToVpnTables();
return;
}
BgpTable *table = instance->GetTable(Address::RTARGET);
BGP_LOG_PEER_TABLE(this, SandeshLevel::SYS_DEBUG, BGP_LOG_FLAG_TRACE,
table, "Register peer with the table");
membership_mgr->Register(this, table, policy_, -1,
boost::bind(&BgpPeer::MembershipRequestCallback, this, _1, _2));
membership_req_pending_++;
StartEndOfRibTimer();
vector<Address::Family> vpn_family_list = list_of
(Address::INETVPN)(Address::INET6VPN)(Address::ERMVPN)(Address::EVPN);
BOOST_FOREACH(Address::Family vpn_family, vpn_family_list) {
if (!IsFamilyNegotiated(vpn_family))
continue;
BgpTable *table = instance->GetTable(vpn_family);
BGP_LOG_PEER_TABLE(this, SandeshLevel::SYS_INFO, BGP_LOG_FLAG_TRACE,
table, "Register ribin for peer with the table");
membership_mgr->RegisterRibIn(this, table);
}
}
void BgpPeer::SendOpen(TcpSession *session) {
BgpProto::OpenMessage openmsg;
openmsg.as_num = local_as_;
openmsg.holdtime = state_machine_->GetConfiguredHoldTime();
openmsg.identifier = ntohl(local_bgp_id_);
BgpProto::OpenMessage::OptParam *opt_param =
new BgpProto::OpenMessage::OptParam;
static const uint8_t cap_mp[][4] = {
{ 0, BgpAf::IPv4, 0, BgpAf::Unicast },
{ 0, BgpAf::IPv4, 0, BgpAf::Vpn },
{ 0, BgpAf::L2Vpn, 0, BgpAf::EVpn },
{ 0, BgpAf::IPv4, 0, BgpAf::RTarget },
{ 0, BgpAf::IPv4, 0, BgpAf::ErmVpn },
{ 0, BgpAf::IPv6, 0, BgpAf::Unicast },
{ 0, BgpAf::IPv6, 0, BgpAf::Vpn },
};
typedef map<Address::Family, const uint8_t *> FamilyToCapabilityMap;
static const FamilyToCapabilityMap family_to_cap_map = map_list_of
(Address::INET, cap_mp[0])
(Address::INETVPN, cap_mp[1])
(Address::EVPN, cap_mp[2])
(Address::RTARGET, cap_mp[3])
(Address::ERMVPN, cap_mp[4])
(Address::INET6, cap_mp[5])
(Address::INET6VPN, cap_mp[6]);
// Add capabilities for configured address families.
BOOST_FOREACH(const FamilyToCapabilityMap::value_type &val,
family_to_cap_map) {
if (!LookupFamily(val.first))
continue;
BgpProto::OpenMessage::Capability *cap =
new BgpProto::OpenMessage::Capability(
BgpProto::OpenMessage::Capability::MpExtension, val.second, 4);
opt_param->capabilities.push_back(cap);
}
// Add restart capability for generating end-of-rib.
const uint8_t restart_cap[2] = { 0x0, 0x0 };
BgpProto::OpenMessage::Capability *cap =
new BgpProto::OpenMessage::Capability(
BgpProto::OpenMessage::Capability::GracefulRestart, restart_cap, 2);
opt_param->capabilities.push_back(cap);
if (opt_param->capabilities.size()) {
openmsg.opt_params.push_back(opt_param);
} else {
delete opt_param;
}
uint8_t data[256];
int result = BgpProto::Encode(&openmsg, data, sizeof(data));
assert(result > BgpProto::kMinMessageSize);
BGP_LOG_PEER(Message, this, SandeshLevel::SYS_INFO, BGP_LOG_FLAG_ALL,
BGP_PEER_DIR_OUT, "Open " << openmsg.ToString());
session->Send(data, result, NULL);
inc_tx_open();
}
void BgpPeer::SendKeepalive(bool from_timer) {
tbb::spin_mutex::scoped_lock lock(spin_mutex_);
// Bail if there's no session for the peer anymore.
if (!session_)
return;
BgpProto::Keepalive msg;
uint8_t data[BgpProto::kMinMessageSize];
int result = BgpProto::Encode(&msg, data, sizeof(data));
assert(result == BgpProto::kMinMessageSize);
SandeshLevel::type log_level = from_timer ? Sandesh::LoggingUtLevel() :
SandeshLevel::SYS_INFO;
BGP_LOG_PEER(Message, this, log_level, BGP_LOG_FLAG_SYSLOG,
BGP_PEER_DIR_OUT, "Keepalive");
send_ready_ = session_->Send(data, result, NULL);
inc_tx_keepalive();
}
static bool SkipUpdateSend() {
static bool init_;
static bool skip_;
if (init_) return skip_;
skip_ = getenv("BGP_SKIP_UPDATE_SEND") != NULL;
init_ = true;
return skip_;
}