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bgpd: Send BGP best path reason to Zebra

Browse Source 
```
exit1-debian-9# show ip route 172.16.16.1/32
Routing entry for 172.16.16.1/32
  Known via "bgp", distance 20, metric 0, best
  Last update 00:00:28 ago
  * 192.168.0.2, via eth1, weight 1
    AS-Path          : 65003
    Communities      : first 65001:2 65001:3
    Large-Communities: 65001:1:1 65001:1:2 65001:1:3
    Selection reason : First path received
```

Signed-off-by: Donatas Abraitis <donatas.abraitis@gmail.com>
This commit is contained in:
Donatas Abraitis 2021-08-06 19:54:57 +03:00
parent 7b3e821076
commit 1d7260a1b5
5 changed files with 22 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
bgpd/bgp_route.c
View File

@ -8415,8 +8415,7 @@ enum bgp_display_type {
normal_list,
};
static const char *
bgp_path_selection_reason2str(enum bgp_path_selection_reason reason)
const char *bgp_path_selection_reason2str(enum bgp_path_selection_reason reason)
{
switch (reason) {
case bgp_path_selection_none:

5
bgpd/bgp_route.h
View File

@ -90,6 +90,9 @@ enum bgp_show_adj_route_type {
/* Maximum number of sids we can process or send with a prefix. */
#define BGP_MAX_SIDS 6
/* Maximum buffer length for storing BGP best path selection reason */
#define BGP_MAX_SELECTION_REASON_STR_BUF 32
/* Error codes for handling NLRI */
#define BGP_NLRI_PARSE_OK 0
#define BGP_NLRI_PARSE_ERROR_PREFIX_OVERFLOW -1
@ -803,4 +806,6 @@ extern void bgp_aggregate_toggle_suppressed(struct bgp_aggregate *aggregate,
const struct prefix *p, afi_t afi,
safi_t safi, bool suppress);
extern void subgroup_announce_reset_nhop(uint8_t family, struct attr *attr);
const char *
bgp_path_selection_reason2str(enum bgp_path_selection_reason reason);
#endif /* _QUAGGA_BGP_ROUTE_H */

5
bgpd/bgp_zebra.c
View File

@ -1489,6 +1489,8 @@ void bgp_zebra_announce(struct bgp_dest *dest, const struct prefix *p,
if (is_add && CHECK_FLAG(bm->flags, BM_FLAG_SEND_EXTRA_DATA_TO_ZEBRA)) {
struct bgp_zebra_opaque bzo = {};
const char *reason =
bgp_path_selection_reason2str(dest->reason);
strlcpy(bzo.aspath, info->attr->aspath->str,
sizeof(bzo.aspath));
@ -1502,6 +1504,9 @@ void bgp_zebra_announce(struct bgp_dest *dest, const struct prefix *p,
strlcpy(bzo.lcommunity, info->attr->lcommunity->str,
sizeof(bzo.lcommunity));
strlcpy(bzo.selection_reason, reason,
sizeof(bzo.selection_reason));
SET_FLAG(api.message, ZAPI_MESSAGE_OPAQUE);
api.opaque.length = MIN(sizeof(struct bgp_zebra_opaque),
ZAPI_MESSAGE_OPAQUE_LENGTH);

6
lib/route_opaque.h
View File

@ -36,6 +36,12 @@ struct bgp_zebra_opaque {
/* Show at least 10 large-communities AA:BB:CC */
char lcommunity[LCOMMUNITY_SIZE * 30];
/* 32 bytes seems enough because of
* bgp_path_selection_confed_as_path which is
* `Confederation based AS Path`.
*/
char selection_reason[BGP_MAX_SELECTION_REASON_STR_BUF];
};
static_assert(sizeof(struct bgp_zebra_opaque) <= ZAPI_MESSAGE_OPAQUE_LENGTH,

5
zebra/zebra_vty.c
View File

@ -449,6 +449,8 @@ static void zebra_show_ip_route_opaque(struct vty *vty, struct route_entry *re,
bzo.community);
json_object_string_add(json, "largeCommunities",
bzo.lcommunity);
json_object_string_add(json, "selectionReason",
bzo.selection_reason);
} else {
vty_out(vty, " AS-Path : %s\n", bzo.aspath);
@ -459,6 +461,9 @@ static void zebra_show_ip_route_opaque(struct vty *vty, struct route_entry *re,
if (bzo.lcommunity[0] != '\0')
vty_out(vty, " Large-Communities: %s\n",
bzo.lcommunity);
vty_out(vty, " Selection reason : %s\n",
bzo.selection_reason);
}
}
default: