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bgpd: factorize nexthop validation code in leak_update function

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Factorize some duplicated codes about nexthop validation in the
leak_update function.

Signed-off-by: Louis Scalbert <louis.scalbert@6wind.com>
This commit is contained in:
Louis Scalbert 2022-04-27 14:15:13 +02:00
parent 820e696f84
commit f99b8a312c
1 changed files with 56 additions and 85 deletions
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141
bgpd/bgp_mplsvpn.c
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@ -767,6 +767,58 @@ static void unsetsids(struct bgp_path_info *bpi)
memset(extra->sid, 0, sizeof(extra->sid));
}
static bool leak_update_nexthop_valid(struct bgp *bgp, struct bgp_dest *bn,
struct attr *new_attr, afi_t afi,
safi_t safi,
struct bgp_path_info *source_bpi,
struct bgp_path_info *bpi,
const struct prefix *p, int debug)
{
struct bgp_path_info *bpi_ultimate;
struct bgp *bgp_nexthop = bgp;
bool nh_valid;
bpi_ultimate = bgp_get_imported_bpi_ultimate(source_bpi);
if (bpi->extra && bpi->extra->bgp_orig)
bgp_nexthop = bpi->extra->bgp_orig;
/*
* No nexthop tracking for redistributed routes or for
* EVPN-imported routes that get leaked.
*/
if (bpi_ultimate->sub_type == BGP_ROUTE_REDISTRIBUTE ||
is_pi_family_evpn(bpi_ultimate))
nh_valid = 1;
else
/*
* TBD do we need to do anything about the
* 'connected' parameter?
*/
nh_valid = bgp_find_or_add_nexthop(bgp, bgp_nexthop, afi, safi,
bpi, NULL, 0, p);
/*
* If you are using SRv6 VPN instead of MPLS, it need to check
* the SID allocation. If the sid is not allocated, the rib
* will be invalid.
*/
if (bgp->srv6_enabled &&
(!new_attr->srv6_l3vpn && !new_attr->srv6_vpn)) {
bgp_path_info_unset_flag(bn, bpi, BGP_PATH_VALID);
nh_valid = false;
}
if (debug)
zlog_debug("%s: nexthop is %svalid (in vrf %s)", __func__,
(nh_valid ? "" : "not "), bgp_nexthop->name_pretty);
if (nh_valid)
bgp_path_info_set_flag(bn, bpi, BGP_PATH_VALID);
return nh_valid;
}
/*
* returns pointer to new bgp_path_info upon success
*/
@ -780,7 +832,6 @@ leak_update(struct bgp *bgp, /* destination bgp instance */
{
const struct prefix *p = bgp_dest_get_prefix(bn);
struct bgp_path_info *bpi;
struct bgp_path_info *bpi_ultimate;
struct bgp_path_info *new;
struct bgp_path_info_extra *extra;
uint32_t num_sids = 0;
@ -809,7 +860,6 @@ leak_update(struct bgp *bgp, /* destination bgp instance */
* schemes that could be implemented in the future.
*
*/
bpi_ultimate = bgp_get_imported_bpi_ultimate(source_bpi);
/*
* match parent
@ -914,45 +964,8 @@ leak_update(struct bgp *bgp, /* destination bgp instance */
if (nexthop_self_flag)
bgp_path_info_set_flag(bn, bpi, BGP_PATH_ANNC_NH_SELF);
struct bgp *bgp_nexthop = bgp;
int nh_valid;
if (bpi->extra && bpi->extra->bgp_orig)
bgp_nexthop = bpi->extra->bgp_orig;
/*
* No nexthop tracking for redistributed routes or for
* EVPN-imported routes that get leaked.
*/
if (bpi_ultimate->sub_type == BGP_ROUTE_REDISTRIBUTE ||
is_pi_family_evpn(bpi_ultimate))
nh_valid = 1;
else
/*
* TBD do we need to do anything about the
* 'connected' parameter?
*/
nh_valid = bgp_find_or_add_nexthop(
bgp, bgp_nexthop, afi, safi, bpi, NULL, 0, p);
/*
* If you are using SRv6 VPN instead of MPLS, it need to check
* the SID allocation. If the sid is not allocated, the rib
* will be invalid.
*/
if (bgp->srv6_enabled
&& (!new_attr->srv6_l3vpn && !new_attr->srv6_vpn)) {
bgp_path_info_unset_flag(bn, bpi, BGP_PATH_VALID);
nh_valid = false;
}
if (debug)
zlog_debug("%s: nexthop is %svalid (in vrf %s)",
__func__, (nh_valid ? "" : "not "),
bgp_nexthop->name_pretty);
if (nh_valid)
bgp_path_info_set_flag(bn, bpi, BGP_PATH_VALID);
leak_update_nexthop_valid(bgp, bn, new_attr, afi, safi,
source_bpi, bpi, p, debug);
/* Process change. */
bgp_aggregate_increment(bgp, p, bpi, afi, safi);
@ -1019,50 +1032,8 @@ leak_update(struct bgp *bgp, /* destination bgp instance */
if (nexthop_orig)
new->extra->nexthop_orig = *nexthop_orig;
/*
* nexthop tracking for unicast routes
*/
struct bgp *bgp_nexthop = bgp;
int nh_valid;
if (new->extra->bgp_orig)
bgp_nexthop = new->extra->bgp_orig;
/*
* No nexthop tracking for redistributed routes because
* their originating protocols will do the tracking and
* withdraw those routes if the nexthops become unreachable
* This also holds good for EVPN-imported routes that get
* leaked.
*/
if (bpi_ultimate->sub_type == BGP_ROUTE_REDISTRIBUTE ||
is_pi_family_evpn(bpi_ultimate))
nh_valid = 1;
else
/*
* TBD do we need to do anything about the
* 'connected' parameter?
*/
nh_valid = bgp_find_or_add_nexthop(bgp, bgp_nexthop, afi, safi,
new, NULL, 0, p);
/*
* If you are using SRv6 VPN instead of MPLS, it need to check
* the SID allocation. If the sid is not allocated, the rib
* will be invalid.
*/
if (bgp->srv6_enabled
&& (!new->attr->srv6_l3vpn && !new->attr->srv6_vpn)) {
bgp_path_info_unset_flag(bn, new, BGP_PATH_VALID);
nh_valid = false;
}
if (debug)
zlog_debug("%s: nexthop is %svalid (in vrf %s)",
__func__, (nh_valid ? "" : "not "),
bgp_nexthop->name_pretty);
if (nh_valid)
bgp_path_info_set_flag(bn, new, BGP_PATH_VALID);
leak_update_nexthop_valid(bgp, bn, new_attr, afi, safi, source_bpi, new,
p, debug);
bgp_aggregate_increment(bgp, p, new, afi, safi);
bgp_path_info_add(bn, new);