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BMP: Improve peer_down handling

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Move all bmp_peer_down() calls to one place and make it synchronous with
BGP session down, ensuring that BMP receives peer_down before route
withdraws from flushing.

Also refactor bmp_peer_down_() message generating code.
This commit is contained in:
Ondrej Zajicek 2023-08-22 01:24:21 +02:00
parent 52641e0866
commit 4558adabfb
4 changed files with 63 additions and 44 deletions
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25
proto/bgp/bgp.c
View File

@ -391,6 +391,9 @@ bgp_close_conn(struct bgp_conn *conn)
conn->local_caps = NULL;
mb_free(conn->remote_caps);
conn->remote_caps = NULL;
conn->notify_data = NULL;
conn->notify_size = 0;
}
@ -694,7 +697,7 @@ bgp_conn_enter_established_state(struct bgp_conn *conn)
}
static void
bgp_conn_leave_established_state(struct bgp_proto *p)
bgp_conn_leave_established_state(struct bgp_conn *conn, struct bgp_proto *p)
{
BGP_TRACE(D_EVENTS, "BGP session closed");
p->last_established = current_time();
@ -702,6 +705,10 @@ bgp_conn_leave_established_state(struct bgp_proto *p)
if (p->p.proto_state == PS_UP)
bgp_stop(p, 0, NULL, 0);
bmp_peer_down(p, p->last_error_class,
conn->notify_code, conn->notify_subcode,
conn->notify_data, conn->notify_size);
}
void
@ -718,7 +725,7 @@ bgp_conn_enter_close_state(struct bgp_conn *conn)
bgp_start_timer(conn->hold_timer, 10);
if (os == BS_ESTABLISHED)
bgp_conn_leave_established_state(p);
bgp_conn_leave_established_state(conn, p);
}
void
@ -732,7 +739,7 @@ bgp_conn_enter_idle_state(struct bgp_conn *conn)
ev_schedule(p->event);
if (os == BS_ESTABLISHED)
bgp_conn_leave_established_state(p);
bgp_conn_leave_established_state(conn, p);
}
/**
@ -876,10 +883,7 @@ bgp_graceful_restart_timeout(timer *t)
}
}
else
{
bgp_stop(p, 0, NULL, 0);
bmp_peer_down(p, BE_NONE, NULL, 0);
}
}
static void
@ -1003,10 +1007,7 @@ bgp_sock_err(sock *sk, int err)
if (err)
BGP_TRACE(D_EVENTS, "Connection lost (%M)", err);
else
{
BGP_TRACE(D_EVENTS, "Connection closed");
bmp_peer_down(p, BE_SOCKET, NULL, 0);
}
if ((conn->state == BS_ESTABLISHED) && p->gr_ready)
bgp_handle_graceful_restart(p);
@ -1331,7 +1332,6 @@ bgp_neigh_notify(neighbor *n)
bgp_store_error(p, NULL, BE_MISC, BEM_NEIGHBOR_LOST);
/* Perhaps also run bgp_update_startup_delay(p)? */
bgp_stop(p, 0, NULL, 0);
bmp_peer_down(p, BE_MISC, NULL, 0);
}
}
else if (p->cf->check_link && !(n->iface->flags & IF_LINK_UP))
@ -1343,7 +1343,6 @@ bgp_neigh_notify(neighbor *n)
if (ps == PS_UP)
bgp_update_startup_delay(p);
bgp_stop(p, 0, NULL, 0);
bmp_peer_down(p, BE_MISC, NULL, 0);
}
}
else
@ -1385,7 +1384,6 @@ bgp_bfd_notify(struct bfd_request *req)
if (ps == PS_UP)
bgp_update_startup_delay(p);
bgp_stop(p, 0, NULL, 0);
bmp_peer_down(p, BE_MISC, NULL, 0);
}
}
}
@ -2266,12 +2264,13 @@ bgp_error(struct bgp_conn *c, uint code, uint subcode, byte *data, int len)
bgp_log_error(p, BE_BGP_TX, "Error", code, subcode, data, ABS(len));
bgp_store_error(p, c, BE_BGP_TX, (code << 16) | subcode);
bgp_conn_enter_close_state(c);
c->notify_code = code;
c->notify_subcode = subcode;
c->notify_data = data;
c->notify_size = (len > 0) ? len : 0;
bgp_conn_enter_close_state(c);
bgp_schedule_packet(c, NULL, PKT_NOTIFICATION);
if (code != 6)

8
proto/bgp/packets.c
View File

@ -3042,7 +3042,6 @@ bgp_fire_tx(struct bgp_conn *conn)
{
conn->packets_to_send = 1 << PKT_SCHEDULE_CLOSE;
end = bgp_create_notification(conn, pkt);
bmp_peer_down(p, BE_BGP_TX, pkt, end - pkt);
return bgp_send(conn, PKT_NOTIFICATION, end - buf);
}
else if (s & (1 << PKT_OPEN))
@ -3334,6 +3333,11 @@ bgp_rx_notification(struct bgp_conn *conn, byte *pkt, uint len)
bgp_log_error(p, BE_BGP_RX, "Received", code, subcode, pkt+21, len-21);
bgp_store_error(p, conn, BE_BGP_RX, (code << 16) | subcode);
conn->notify_code = code;
conn->notify_subcode = subcode;
conn->notify_data = pkt+21;
conn->notify_size = len-21;
bgp_conn_enter_close_state(conn);
bgp_schedule_packet(conn, NULL, PKT_SCHEDULE_CLOSE);
@ -3352,8 +3356,6 @@ bgp_rx_notification(struct bgp_conn *conn, byte *pkt, uint len)
p->p.disabled = 1;
}
}
bmp_peer_down(p, BE_BGP_RX, pkt + BGP_HEADER_LENGTH, len - BGP_HEADER_LENGTH);
}
static void

67
proto/bmp/bmp.c
View File

@ -888,7 +888,7 @@ bmp_send_peer_down_notif_msg(struct bmp_proto *p, const struct bgp_proto *bgp,
static void
bmp_peer_down_(struct bmp_proto *p, const struct bgp_proto *bgp,
const int err_class, const byte *msg, size_t msg_length)
int err_class, int err_code, int err_subcode, const byte *data, int length)
{
if (!p->started)
return;
@ -899,31 +899,43 @@ bmp_peer_down_(struct bmp_proto *p, const struct bgp_proto *bgp,
TRACE(D_STATES, "Peer down for %s", bgp->p.name);
buffer payload = bmp_buffer_alloc(p->buffer_mpool, 1 + BGP_HEADER_LENGTH + msg_length);
uint bmp_code = 0;
uint fsm_code = 0;
if (msg)
switch (err_class)
{
if (err_class == BE_BGP_TX)
bmp_put_u8(&payload, BMP_PEER_DOWN_REASON_LOCAL_BGP_NOTIFICATION);
else
bmp_put_u8(&payload, BMP_PEER_DOWN_REASON_REMOTE_BGP_NOTIFICATION);
case BE_BGP_RX:
bmp_code = BMP_PEER_DOWN_REASON_REMOTE_BGP_NOTIFICATION;
break;
bmp_put_bgp_hdr(&payload, BGP_HEADER_LENGTH + msg_length, PKT_NOTIFICATION);
bmp_put_data(&payload, msg, msg_length);
case BE_BGP_TX:
case BE_AUTO_DOWN:
case BE_MAN_DOWN:
bmp_code = BMP_PEER_DOWN_REASON_LOCAL_BGP_NOTIFICATION;
break;
default:
bmp_code = BMP_PEER_DOWN_REASON_REMOTE_NO_NOTIFICATION;
length = 0;
break;
}
else
buffer payload = bmp_buffer_alloc(p->buffer_mpool, 1 + BGP_HEADER_LENGTH + 2 + length);
bmp_put_u8(&payload, bmp_code);
switch (bmp_code)
{
// TODO: Handle De-configured Peer Down Reason Code
if (err_class == BE_SOCKET || err_class == BE_MISC)
{
bmp_put_u8(&payload, BMP_PEER_DOWN_REASON_REMOTE_NO_NOTIFICATION);
}
else
{
bmp_put_u8(&payload, BMP_PEER_DOWN_REASON_LOCAL_NO_NOTIFICATION);
// TODO: Fill in with appropriate FSM event code
bmp_put_u16(&payload, 0x00); // no relevant Event code is defined
}
case BMP_PEER_DOWN_REASON_LOCAL_BGP_NOTIFICATION:
case BMP_PEER_DOWN_REASON_REMOTE_BGP_NOTIFICATION:
bmp_put_bgp_hdr(&payload, BGP_HEADER_LENGTH + 2 + length, PKT_NOTIFICATION);
bmp_put_u8(&payload, err_code);
bmp_put_u8(&payload, err_subcode);
bmp_put_data(&payload, data, length);
break;
case BMP_PEER_DOWN_REASON_LOCAL_NO_NOTIFICATION:
bmp_put_u16(&payload, fsm_code);
break;
}
bmp_send_peer_down_notif_msg(p, bgp, bmp_buffer_data(&payload), bmp_buffer_pos(&payload));
@ -934,12 +946,12 @@ bmp_peer_down_(struct bmp_proto *p, const struct bgp_proto *bgp,
}
void
bmp_peer_down(const struct bgp_proto *bgp, const int err_class,
const byte *msg, size_t msg_length)
bmp_peer_down(const struct bgp_proto *bgp,
int err_class, int code, int subcode, const byte *data, int length)
{
struct bmp_proto *p; node *n;
WALK_LIST2(p, n, bmp_proto_list, bmp_node)
bmp_peer_down_(p, bgp, err_class, msg, msg_length);
bmp_peer_down_(p, bgp, err_class, code, subcode, data, length);
}
static void
@ -988,6 +1000,13 @@ bmp_rt_notify(struct proto *P, struct channel *c, struct network *net,
struct bgp_proto *bgp = (void *) src->c.proto;
bool policy = (c->table == src->c.table);
/*
* We assume that we receive peer_up before the first route and peer_down
* synchronously with BGP session close. So if bmp_stream exists, the related
* BGP session is up and could be accessed. That may not be true in
* multithreaded setup.
*/
struct bmp_stream *bs = bmp_find_stream(p, bgp, src->afi, policy);
if (!bs)
return;

7
proto/bmp/bmp.h
View File

@ -116,14 +116,13 @@ bmp_peer_up(struct bgp_proto *bgp,
* established state
*/
void
bmp_peer_down(const struct bgp_proto *bgp, const int err_class, const byte *pkt,
size_t pkt_size);
bmp_peer_down(const struct bgp_proto *bgp, int err_class, int code, int subcode, const byte *data, int length);
#else /* BMP build disabled */
static inline void bmp_peer_up(const struct bgp_proto *bgp UNUSED, const byte *tx_open_msg UNUSED, uint tx_open_length UNUSED, const byte *rx_open_msg UNUSED, uint rx_open_length UNUSED) { }
static inline void bmp_peer_down(const struct bgp_proto *bgp UNUSED, const int err_class UNUSED, const byte *pkt UNUSED, size_t pkt_size UNUSED) { }
static inline void bmp_peer_up(struct bgp_proto *bgp UNUSED, const byte *tx_open_msg UNUSED, uint tx_open_length UNUSED, const byte *rx_open_msg UNUSED, uint rx_open_length UNUSED) { }
static inline void bmp_peer_down(const struct bgp_proto *bgp UNUSED, const int err_class UNUSED, int code UNUSED, int subcode UNUSED, const byte *data UNUSED, int length UNUSED) { }
#endif /* CONFIG_BMP */