From 8be20996c4a4653cd4ff57a1e47b9887b0272de7 Mon Sep 17 00:00:00 2001 From: Donald Sharp Date: Mon, 11 Dec 2023 10:46:53 -0500 Subject: [PATCH] bgpd: Make `suppress-fib-pending` clear peering When a peer has come up and already started installing routes into the rib and `suppress-fib-pending` is either turned on or off. BGP is left with some routes that may need to be withdrawn from peers and routes that it does not know the status of. Clear the BGP peers for the interesting parties and let's let us come up to speed as needed. Signed-off-by: Donald Sharp --- bgpd/bgp_fsm.c | 75 ++++++++++++++++++++++++++------------------------ bgpd/bgpd.c | 39 ++++++++++++++++++++++++++ bgpd/bgpd.h | 1 + 3 files changed, 79 insertions(+), 36 deletions(-) diff --git a/bgpd/bgp_fsm.c b/bgpd/bgp_fsm.c index caa11313976c..400ddc2d09cd 100644 --- a/bgpd/bgp_fsm.c +++ b/bgpd/bgp_fsm.c @@ -562,42 +562,45 @@ void bgp_delayopen_timer(struct event *thread) } /* BGP Peer Down Cause */ -const char *const peer_down_str[] = {"", - "Router ID changed", - "Remote AS changed", - "Local AS change", - "Cluster ID changed", - "Confederation identifier changed", - "Confederation peer changed", - "RR client config change", - "RS client config change", - "Update source change", - "Address family activated", - "Admin. shutdown", - "User reset", - "BGP Notification received", - "BGP Notification send", - "Peer closed the session", - "Neighbor deleted", - "Peer-group add member", - "Peer-group delete member", - "Capability changed", - "Passive config change", - "Multihop config change", - "NSF peer closed the session", - "Intf peering v6only config change", - "BFD down received", - "Interface down", - "Neighbor address lost", - "No path to specified Neighbor", - "Waiting for Peer IPv6 LLA", - "Waiting for VRF to be initialized", - "No AFI/SAFI activated for peer", - "AS Set config change", - "Waiting for peer OPEN", - "Reached received prefix count", - "Socket Error", - "Admin. shutdown (RTT)"}; +const char *const peer_down_str[] = { + "", + "Router ID changed", + "Remote AS changed", + "Local AS change", + "Cluster ID changed", + "Confederation identifier changed", + "Confederation peer changed", + "RR client config change", + "RS client config change", + "Update source change", + "Address family activated", + "Admin. shutdown", + "User reset", + "BGP Notification received", + "BGP Notification send", + "Peer closed the session", + "Neighbor deleted", + "Peer-group add member", + "Peer-group delete member", + "Capability changed", + "Passive config change", + "Multihop config change", + "NSF peer closed the session", + "Intf peering v6only config change", + "BFD down received", + "Interface down", + "Neighbor address lost", + "No path to specified Neighbor", + "Waiting for Peer IPv6 LLA", + "Waiting for VRF to be initialized", + "No AFI/SAFI activated for peer", + "AS Set config change", + "Waiting for peer OPEN", + "Reached received prefix count", + "Socket Error", + "Admin. shutdown (RTT)", + "Suppress Fib Turned on or Off", +}; static void bgp_graceful_restart_timer_off(struct peer_connection *connection, struct peer *peer) diff --git a/bgpd/bgpd.c b/bgpd/bgpd.c index 051d9207167e..151f5f9b64d5 100644 --- a/bgpd/bgpd.c +++ b/bgpd/bgpd.c @@ -409,6 +409,9 @@ void bgp_router_id_static_set(struct bgp *bgp, struct in_addr id) void bm_wait_for_fib_set(bool set) { bool send_msg = false; + struct bgp *bgp; + struct peer *peer; + struct listnode *next, *node; if (bm->wait_for_fib == set) return; @@ -427,12 +430,32 @@ void bm_wait_for_fib_set(bool set) if (send_msg && zclient) zebra_route_notify_send(ZEBRA_ROUTE_NOTIFY_REQUEST, zclient, set); + + /* + * If this is configed at a time when peers are already set + * FRR needs to reset the connection(s) as that some installs + * may have already happened in some shape fashion or form + * let's just start over + */ + for (ALL_LIST_ELEMENTS_RO(bm->bgp, next, bgp)) { + for (ALL_LIST_ELEMENTS_RO(bgp->peer, node, peer)) { + if (!BGP_IS_VALID_STATE_FOR_NOTIF( + peer->connection->status)) + continue; + + peer->last_reset = PEER_DOWN_SUPPRESS_FIB_PENDING; + bgp_notify_send(peer->connection, BGP_NOTIFY_CEASE, + BGP_NOTIFY_CEASE_CONFIG_CHANGE); + } + } } /* Set the suppress fib pending for the bgp configuration */ void bgp_suppress_fib_pending_set(struct bgp *bgp, bool set) { bool send_msg = false; + struct peer *peer; + struct listnode *node; if (bgp->inst_type == BGP_INSTANCE_TYPE_VIEW) return; @@ -445,6 +468,7 @@ void bgp_suppress_fib_pending_set(struct bgp *bgp, bool set) if (bgp_suppress_fib_count == 0) send_msg = true; bgp_suppress_fib_count++; + } else { UNSET_FLAG(bgp->flags, BGP_FLAG_SUPPRESS_FIB_PENDING); bgp_suppress_fib_count--; @@ -464,6 +488,21 @@ void bgp_suppress_fib_pending_set(struct bgp *bgp, bool set) zebra_route_notify_send(ZEBRA_ROUTE_NOTIFY_REQUEST, zclient, set); } + + /* + * If this is configed at a time when peers are already set + * FRR needs to reset the connection as that some installs + * may have already happened in some shape fashion or form + * let's just start over + */ + for (ALL_LIST_ELEMENTS_RO(bgp->peer, node, peer)) { + if (!BGP_IS_VALID_STATE_FOR_NOTIF(peer->connection->status)) + continue; + + peer->last_reset = PEER_DOWN_SUPPRESS_FIB_PENDING; + bgp_notify_send(peer->connection, BGP_NOTIFY_CEASE, + BGP_NOTIFY_CEASE_CONFIG_CHANGE); + } } /* BGP's cluster-id control. */ diff --git a/bgpd/bgpd.h b/bgpd/bgpd.h index 9e9d1c1e1ea6..4c12872ee9e0 100644 --- a/bgpd/bgpd.h +++ b/bgpd/bgpd.h @@ -1757,6 +1757,7 @@ struct peer { #define PEER_DOWN_PFX_COUNT 33U /* Reached received prefix count */ #define PEER_DOWN_SOCKET_ERROR 34U /* Some socket error happened */ #define PEER_DOWN_RTT_SHUTDOWN 35U /* Automatically shutdown due to RTT */ +#define PEER_DOWN_SUPPRESS_FIB_PENDING 36U /* Suppress fib pending changed */ /* * Remember to update peer_down_str in bgp_fsm.c when you add * a new value to the last_reset reason