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bgpd: add 'show bgp label-nexthop [detail]' command

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The following command is made available to list the labels
allocated per-nexthop, along with the paths registered to it.

 > # show bgp vrf vrf1 label-nexthop
 > Current BGP label nexthop cache for IP, VRF vrf1
 >  192.0.2.11, label 20 #paths 3
 >    if r1-eth1
 >    Last update: Mon Jan 16 18:52:11 2023
 >  192.0.2.12, label 17 #paths 2
 >    if r1-eth1
 >    Last update: Mon Jan 16 18:52:08 2023
 >  192.0.2.14, label 18 #paths 1
 >    if r1-eth1
 >    Last update: Mon Jan 16 18:52:07 2023
 >  192.168.255.13, label 19 #paths 1
 >    if r1-eth2
 >    Last update: Mon Jan 16 18:52:10 2023

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
This commit is contained in:
Philippe Guibert 2023-01-16 18:24:26 +01:00
parent 60e5bc23b9
commit 6483c4d37b
3 changed files with 103 additions and 0 deletions
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100
bgpd/bgp_labelpool.c
View File

@ -24,6 +24,8 @@
#include "bgpd/bgp_errors.h"
#include "bgpd/bgp_route.h"
#include "bgpd/bgp_zebra.h"
#include "bgpd/bgp_vty.h"
#include "bgpd/bgp_rd.h"
#define BGP_LABELPOOL_ENABLE_TESTS 0
@ -1080,6 +1082,99 @@ DEFUN(show_bgp_labelpool_chunks, show_bgp_labelpool_chunks_cmd,
return CMD_SUCCESS;
}
static void show_bgp_nexthop_label_afi(struct vty *vty, afi_t afi,
struct bgp *bgp, bool detail)
{
struct bgp_label_per_nexthop_cache_head *tree;
struct bgp_label_per_nexthop_cache *iter;
safi_t safi;
void *src;
char buf[PREFIX2STR_BUFFER];
char labelstr[MPLS_LABEL_STRLEN];
struct bgp_dest *dest;
struct bgp_path_info *path;
struct bgp *bgp_path;
struct bgp_table *table;
time_t tbuf;
vty_out(vty, "Current BGP label nexthop cache for %s, VRF %s\n",
afi2str(afi), bgp->name_pretty);
tree = &bgp->mpls_labels_per_nexthop[afi];
frr_each (bgp_label_per_nexthop_cache, tree, iter) {
if (afi2family(afi) == AF_INET)
src = (void *)&iter->nexthop.u.prefix4;
else
src = (void *)&iter->nexthop.u.prefix6;
vty_out(vty, " %s, label %s #paths %u\n",
inet_ntop(afi2family(afi), src, buf, sizeof(buf)),
mpls_label2str(1, &iter->label, labelstr,
sizeof(labelstr), 0, true),
iter->path_count);
if (iter->nh)
vty_out(vty, " if %s\n",
ifindex2ifname(iter->nh->ifindex,
iter->nh->vrf_id));
tbuf = time(NULL) - (monotime(NULL) - iter->last_update);
vty_out(vty, " Last update: %s", ctime(&tbuf));
if (!detail)
continue;
vty_out(vty, " Paths:\n");
LIST_FOREACH (path, &(iter->paths), label_nh_thread) {
dest = path->net;
table = bgp_dest_table(dest);
assert(dest && table);
afi = family2afi(bgp_dest_get_prefix(dest)->family);
safi = table->safi;
bgp_path = table->bgp;
if (dest->pdest) {
vty_out(vty, " %d/%d %pBD RD ", afi, safi,
dest);
vty_out(vty, BGP_RD_AS_FORMAT(bgp->asnotation),
(struct prefix_rd *)bgp_dest_get_prefix(
dest->pdest));
vty_out(vty, " %s flags 0x%x\n",
bgp_path->name_pretty, path->flags);
} else
vty_out(vty, " %d/%d %pBD %s flags 0x%x\n",
afi, safi, dest, bgp_path->name_pretty,
path->flags);
}
}
}
DEFPY(show_bgp_nexthop_label, show_bgp_nexthop_label_cmd,
"show bgp [<view|vrf> VIEWVRFNAME] label-nexthop [detail]",
SHOW_STR BGP_STR BGP_INSTANCE_HELP_STR
"BGP label per-nexthop table\n"
"Show detailed information\n")
{
int idx = 0;
char *vrf = NULL;
struct bgp *bgp;
bool detail = false;
int afi;
if (argv_find(argv, argc, "vrf", &idx)) {
vrf = argv[++idx]->arg;
bgp = bgp_lookup_by_name(vrf);
} else
bgp = bgp_get_default();
if (!bgp)
return CMD_SUCCESS;
if (argv_find(argv, argc, "detail", &idx))
detail = true;
for (afi = AFI_IP; afi <= AFI_IP6; afi++)
show_bgp_nexthop_label_afi(vty, afi, bgp, detail);
return CMD_SUCCESS;
}
#if BGP_LABELPOOL_ENABLE_TESTS
/*------------------------------------------------------------------------
* Testing code start
@ -1617,3 +1712,8 @@ void bgp_label_per_nexthop_free(struct bgp_label_per_nexthop_cache *blnc)
blnc->nh = NULL;
XFREE(MTYPE_LABEL_PER_NEXTHOP_CACHE, blnc);
}
void bgp_label_per_nexthop_init(void)
{
install_element(VIEW_NODE, &show_bgp_nexthop_label_cmd);
}

1
bgpd/bgp_labelpool.h
View File

@ -92,4 +92,5 @@ bgp_label_per_nexthop_new(struct bgp_label_per_nexthop_cache_head *tree,
struct bgp_label_per_nexthop_cache *
bgp_label_per_nexthop_find(struct bgp_label_per_nexthop_cache_head *tree,
struct prefix *nexthop);
void bgp_label_per_nexthop_init(void);
#endif /* _FRR_BGP_LABELPOOL_H */

2
bgpd/bgpd.c
View File

@ -8257,6 +8257,8 @@ void bgp_init(unsigned short instance)
bgp_lp_vty_init();
bgp_label_per_nexthop_init();
cmd_variable_handler_register(bgp_viewvrf_var_handlers);
}