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BGP: Implement 'disable after cease' option

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The option allows to specify that some cease subcodes should
disable the protocol when received.
This commit is contained in:
Ondrej Zajicek (work) 2018-01-16 19:17:04 +01:00
parent b940579115
commit 63472779ad
3 changed files with 41 additions and 0 deletions
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1
proto/bgp/bgp.h
View file

@ -62,6 +62,7 @@ struct bgp_config {
unsigned error_delay_time_min; /* Time to wait after an error is detected */
unsigned error_delay_time_max;
unsigned disable_after_error; /* Disable the protocol when error is detected */
u32 disable_after_cease; /* Disable it when cease is received, bitfield */
char *password; /* Password used for MD5 authentication */
struct rtable_config *igp_table; /* Table used for recursive next hop lookups */

30
proto/bgp/config.Y
View file

@ -29,6 +29,12 @@ CF_KEYWORDS(BGP, LOCAL, NEIGHBOR, AS, HOLD, TIME, CONNECT, RETRY,
SECONDARY, ALLOW, BFD, ADD, PATHS, RX, TX, GRACEFUL, RESTART, AWARE,
CHECK, LINK, PORT, EXTENDED, MESSAGES, SETKEY, BGP_LARGE_COMMUNITY)
CF_KEYWORDS(CEASE, PREFIX, LIMIT, HIT, ADMINISTRATIVE, SHUTDOWN, RESET, PEER,
CONFIGURATION, CHANGE, DECONFIGURED, CONNECTION, REJECTED, COLLISION,
OUT, OF, RESOURCES)
%type<i> bgp_cease_mask bgp_cease_list bgp_cease_flag
CF_GRAMMAR
CF_ADDTO(proto, bgp_proto '}' { bgp_check_config(BGP_CFG); } )
@ -64,6 +70,29 @@ bgp_nbr_opts:
| bgp_nbr_opts AS expr { BGP_CFG->remote_as = $3; }
;
bgp_cease_mask:
/* true -> all except connection collision */
bool { $$ = $1 ? ~(1 << 7) : 0; }
| '{' bgp_cease_list '}' { $$ = $2; }
;
bgp_cease_list:
bgp_cease_flag
| bgp_cease_list ',' bgp_cease_flag { $$ = $1 | $3; }
;
bgp_cease_flag:
CEASE { $$ = 1 << 0; }
| PREFIX LIMIT HIT { $$ = 1 << 1; }
| ADMINISTRATIVE SHUTDOWN { $$ = 1 << 2; }
| PEER DECONFIGURED { $$ = 1 << 3; }
| ADMINISTRATIVE RESET { $$ = 1 << 4; }
| CONNECTION REJECTED { $$ = 1 << 5; }
| CONFIGURATION CHANGE { $$ = 1 << 6; }
| CONNECTION COLLISION { $$ = 1 << 7; }
| OUT OF RESOURCES { $$ = 1 << 8; }
;
bgp_proto:
bgp_proto_start proto_name '{'
| bgp_proto proto_item ';'
@ -107,6 +136,7 @@ bgp_proto:
| bgp_proto ERROR FORGET TIME expr ';' { BGP_CFG->error_amnesia_time = $5; }
| bgp_proto ERROR WAIT TIME expr ',' expr ';' { BGP_CFG->error_delay_time_min = $5; BGP_CFG->error_delay_time_max = $7; }
| bgp_proto DISABLE AFTER ERROR bool ';' { BGP_CFG->disable_after_error = $5; }
| bgp_proto DISABLE AFTER CEASE bgp_cease_mask ';' { BGP_CFG->disable_after_cease = $5; }
| bgp_proto ENABLE ROUTE REFRESH bool ';' { BGP_CFG->enable_refresh = $5; }
| bgp_proto ENABLE AS4 bool ';' { BGP_CFG->enable_as4 = $4; }
| bgp_proto ENABLE EXTENDED MESSAGES bool ';' { BGP_CFG->enable_extended_messages = $5; }

10
proto/bgp/packets.c
View file

@ -1607,6 +1607,16 @@ bgp_rx_notification(struct bgp_conn *conn, byte *pkt, uint len)
bgp_update_startup_delay(p);
bgp_stop(p, 0, NULL, 0);
}
else
{
uint subcode_bit = 1 << ((subcode <= 8) ? subcode : 0);
if (p->cf->disable_after_cease & subcode_bit)
{
log(L_INFO "%s: Disabled after Cease notification", p->p.name);
p->startup_delay = 0;
p->p.disabled = 1;
}
}
}
static void