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bgpd: bgp instance administrative shutdown.

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* Changes allow administratively shutting down all peers of a BGP
  instance.
* New CLI commands "[no] bgp shutdown" in vty shell.
* For review and testing only.

Signed-off-by: David Schweizer <dschweizer@opensourcerouting.org>
This commit is contained in:
David Schweizer 2020-08-13 17:52:49 +02:00
parent c64e4ca2a7
commit 9cf5943257
No known key found for this signature in database
GPG Key ID: A07D97BEEE79EF7F
3 changed files with 102 additions and 0 deletions
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35
bgpd/bgp_vty.c
View File

@ -3600,6 +3600,33 @@ DEFUN (bgp_default_shutdown,
return CMD_SUCCESS;
}
DEFPY (bgp_shutdown,
bgp_shutdown_cmd,
"bgp shutdown",
BGP_STR
"Enable administrative shutdown of the BGP instance\n")
{
VTY_DECLVAR_CONTEXT(bgp, bgp);
bgp_shutdown_enable(bgp);
return CMD_SUCCESS;
}
DEFPY (no_bgp_shutdown,
no_bgp_shutdown_cmd,
"no bgp shutdown",
NO_STR
BGP_STR
"Disable administrative shutdown of the BGP instance\n")
{
VTY_DECLVAR_CONTEXT(bgp, bgp);
bgp_shutdown_disable(bgp);
return CMD_SUCCESS;
}
DEFUN (neighbor_remote_as,
neighbor_remote_as_cmd,
"neighbor <A.B.C.D|X:X::X:X|WORD> remote-as <(1-4294967295)|internal|external>",
@ -15563,6 +15590,10 @@ int bgp_config_write(struct vty *vty)
if (bgp->autoshutdown)
vty_out(vty, " bgp default shutdown\n");
/* BGP instance administrative shutdown */
if (CHECK_FLAG(bgp->flags, BGP_FLAG_SHUTDOWN))
vty_out(vty, " bgp shutdown\n");
/* IPv4 unicast configuration. */
bgp_config_write_family(vty, bgp, AFI_IP, SAFI_UNICAST);
@ -16026,6 +16057,10 @@ void bgp_vty_init(void)
/* "bgp default shutdown" command */
install_element(BGP_NODE, &bgp_default_shutdown_cmd);
/* "bgp shutdown" commands */
install_element(BGP_NODE, &bgp_shutdown_cmd);
install_element(BGP_NODE, &no_bgp_shutdown_cmd);
/* "neighbor remote-as" commands. */
install_element(BGP_NODE, &neighbor_remote_as_cmd);
install_element(BGP_NODE, &neighbor_interface_config_cmd);

61
bgpd/bgpd.c
View File

@ -4023,6 +4023,67 @@ static void peer_flag_modify_action(struct peer *peer, uint32_t flag)
bgp_session_reset(peer);
}
/* Enable global administrative shutdown of all peers of BGP instance */
void bgp_shutdown_enable(struct bgp *bgp)
{
struct peer *peer;
struct listnode *node;
/* do nothing if already shut down */
if (CHECK_FLAG(bgp->flags, BGP_FLAG_SHUTDOWN))
return;
/* iterate through peers of BGP instance */
for (ALL_LIST_ELEMENTS_RO(bgp->peer, node, peer)) {
/* continue, if peer is already in administrative shutdown. */
if (CHECK_FLAG(peer->flags, PEER_FLAG_SHUTDOWN))
continue;
/* send a RFC 4486 notification message if necessary */
if (BGP_IS_VALID_STATE_FOR_NOTIF(peer->status)) {
bgp_notify_send(peer, BGP_NOTIFY_CEASE,
BGP_NOTIFY_CEASE_ADMIN_SHUTDOWN);
}
/* reset start timer to initial value */
peer->v_start = BGP_INIT_START_TIMER;
/* trigger a RFC 4271 ManualStop event */
BGP_EVENT_ADD(peer, BGP_Stop);
}
/* set the BGP instances shutdown flag */
SET_FLAG(bgp->flags, BGP_FLAG_SHUTDOWN);
}
/* Disable global administrative shutdown of all peers of BGP instance */
void bgp_shutdown_disable(struct bgp *bgp)
{
struct peer *peer;
struct listnode *node;
/* do nothing if not shut down. */
if (!CHECK_FLAG(bgp->flags, BGP_FLAG_SHUTDOWN))
return;
/* iterate through peers of BGP instance */
for (ALL_LIST_ELEMENTS_RO(bgp->peer, node, peer)) {
/* respect individual peer shutdown */
if (CHECK_FLAG(peer->flags, PEER_FLAG_SHUTDOWN))
continue;
/* respect peer group shutdown */
if (CHECK_FLAG(peer->group->conf->flags, PEER_FLAG_SHUTDOWN))
continue;
/* trigger a RFC 4721 ManualStart event. */
BGP_EVENT_ADD(peer, BGP_Start);
}
/* clear the BGP instances shutdown flag */
UNSET_FLAG(bgp->flags, BGP_FLAG_SHUTDOWN);
}
/* Change specified peer flag. */
static int peer_flag_modify(struct peer *peer, uint32_t flag, int set)
{

6
bgpd/bgpd.h
View File

@ -452,6 +452,9 @@ struct bgp {
#define BGP_FLAG_EBGP_REQUIRES_POLICY (1 << 25)
#define BGP_FLAG_SHOW_NEXTHOP_HOSTNAME (1 << 26)
/* This flag is set if the instance is in administrative shutdown */
#define BGP_FLAG_SHUTDOWN (1 << 27)
enum global_mode GLOBAL_GR_FSM[BGP_GLOBAL_GR_MODE]
[BGP_GLOBAL_GR_EVENT_CMD];
enum global_mode global_gr_present_state;
@ -1947,6 +1950,9 @@ extern struct peer_af *peer_af_create(struct peer *, afi_t, safi_t);
extern struct peer_af *peer_af_find(struct peer *, afi_t, safi_t);
extern int peer_af_delete(struct peer *, afi_t, safi_t);
extern void bgp_shutdown_enable(struct bgp *bgp);
extern void bgp_shutdown_disable(struct bgp *bgp);
extern void bgp_close(void);
extern void bgp_free(struct bgp *);
void bgp_gr_apply_running_config(void);