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Bmp various fixes #17373

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Bmp various fixes #17373

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34953f2
bgpd: bmp, fix address sanitizer issue
pguibert6WIND Oct 29, 2024
00419d2
bgpd: fix warning of compilation when using bgp_trace
pguibert6WIND Nov 8, 2024
ec11074
bgpd: fix do re-send post-policy bgp update when not valid
pguibert6WIND Oct 29, 2024
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25 changes: 24 additions & 1 deletion bgpd/bgp_bmp.c
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@
#include "bgpd/bgp_table.h"
#include "bgpd/bgpd.h"
#include "bgpd/bgp_route.h"
#include "bgpd/bgp_nht.h"
#include "bgpd/bgp_attr.h"
#include "bgpd/bgp_dump.h"
#include "bgpd/bgp_errors.h"
Expand Down Expand Up @@ -1679,6 +1680,26 @@ static int bmp_process(struct bgp *bgp, afi_t afi, safi_t safi,
return 0;
}

static int bmp_nht_path_valid(struct bgp *bgp, struct bgp_path_info *path, bool valid)
{
struct bgp_dest *dest = path->net;
struct bgp_table *table;

if (frrtrace_enabled(frr_bgp, bmp_nht_path_valid)) {
char pfxprint[PREFIX2STR_BUFFER];

prefix2str(&dest->rn->p, pfxprint, sizeof(pfxprint));
frrtrace(4, frr_bgp, bmp_nht_path_valid, bgp, pfxprint, path, valid);
}
if (bgp->peer_self == path->peer)
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why aren't "redistributed networks relevant for bmp" ?

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redistributed networks are the ones that are added in BGP when doing:

router bgp 65500
address-family ipv4 unicast
redistribute static

because they originate from already selected routes, those routes are always available, and are not impacted by BGP nexthop tracking. If there is a reachability problem, BGP will receive a bgp_redistribute_delete command from the route that disappeared from static route list.

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ohh okay i see, you meant "not relevant for next hop tracking" not "for bmp"
i understand it now thx

/* self declared networks or redistributed networks are not relevant for bmp */
return 0;

table = bgp_dest_table(dest);

return bmp_process(bgp, table->afi, table->safi, dest, path->peer, !valid);
}

static void bmp_stat_put_u32(struct stream *s, size_t *cnt, uint16_t type,
uint32_t value)
{
Expand Down Expand Up @@ -1981,7 +2002,8 @@ static void bmp_bgp_peer_vrf(struct bmp_bgp_peer *bbpeer, struct bgp *bgp)
memcpy(bbpeer->open_rx, s->data, open_len);

bbpeer->open_tx_len = open_len;
bbpeer->open_tx = bbpeer->open_rx;
bbpeer->open_tx = XMALLOC(MTYPE_BMP_OPEN, open_len);
memcpy(bbpeer->open_tx, s->data, open_len);

stream_free(s);
}
Expand Down Expand Up @@ -3155,6 +3177,7 @@ static int bgp_bmp_module_init(void)
hook_register(peer_status_changed, bmp_peer_status_changed);
hook_register(peer_backward_transition, bmp_peer_backward);
hook_register(bgp_process, bmp_process);
hook_register(bgp_nht_path_update, bmp_nht_path_valid);
hook_register(bgp_inst_config_write, bmp_config_write);
hook_register(bgp_inst_delete, bmp_bgp_del);
hook_register(frr_late_init, bgp_bmp_init);
Expand Down
2 changes: 1 addition & 1 deletion bgpd/bgp_io.c
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Original file line number Diff line number Diff line change
Expand Up @@ -199,7 +199,7 @@ static int read_ibuf_work(struct peer_connection *connection)
assert(ringbuf_get(ibw, pkt->data, pktsize) == pktsize);
stream_set_endp(pkt, pktsize);

frrtrace(2, frr_bgp, packet_read, connection->peer, pkt);
frrtrace(2, frr_bgp, packet_read, connection, pkt);
frr_with_mutex (&connection->io_mtx) {
stream_fifo_push(connection->ibuf, pkt);
}
Expand Down
6 changes: 6 additions & 0 deletions bgpd/bgp_nht.c
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,9 @@ static void unregister_zebra_rnh(struct bgp_nexthop_cache *bnc);
static int make_prefix(int afi, struct bgp_path_info *pi, struct prefix *p);
static void bgp_nht_ifp_initial(struct event *thread);

DEFINE_HOOK(bgp_nht_path_update, (struct bgp *bgp, struct bgp_path_info *pi, bool valid),
(bgp, pi, valid));

static int bgp_isvalid_nexthop(struct bgp_nexthop_cache *bnc)
{
return (bgp_zebra_num_connects() == 0
Expand Down Expand Up @@ -1442,6 +1445,9 @@ void evaluate_paths(struct bgp_nexthop_cache *bnc)
}
}

if (path_valid != bnc_is_valid_nexthop)
hook_call(bgp_nht_path_update, bgp_path, path, bnc_is_valid_nexthop);

bgp_process(bgp_path, dest, path, afi, safi);
}

Expand Down
5 changes: 5 additions & 0 deletions bgpd/bgp_nht.h
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Original file line number Diff line number Diff line change
Expand Up @@ -83,4 +83,9 @@ extern void bgp_nht_ifp_up(struct interface *ifp);
extern void bgp_nht_ifp_down(struct interface *ifp);

extern void bgp_nht_interface_events(struct peer *peer);

/* called when a path becomes valid or invalid, because of nexthop tracking */
DECLARE_HOOK(bgp_nht_path_update, (struct bgp *bgp, struct bgp_path_info *pi, bool valid),
(bgp, pi, valid));

#endif /* _BGP_NHT_H */
18 changes: 18 additions & 0 deletions bgpd/bgp_trace.h
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Original file line number Diff line number Diff line change
Expand Up @@ -210,6 +210,24 @@ TRACEPOINT_EVENT(

TRACEPOINT_LOGLEVEL(frr_bgp, bmp_process, TRACE_DEBUG)

/*
* BMP is hooked for a nexthop tracking event
*/
TRACEPOINT_EVENT(
frr_bgp,
bmp_nht_path_valid,
TP_ARGS(struct bgp *, bgp, char *, pfx, struct bgp_path_info *,
path, bool, valid),
TP_FIELDS(
ctf_string(bgp, bgp->name_pretty)
ctf_string(prefix, pfx)
ctf_string(path, PEER_HOSTNAME(path->peer))
ctf_integer(bool, valid, valid)
)
)

TRACEPOINT_LOGLEVEL(frr_bgp, bmp_nht_path_valid, TRACE_DEBUG)

/*
* bgp_dest_lock/bgp_dest_unlock
*/
Expand Down
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