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ospfd: Add TI-LFA Prefix-SID Protection

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Signed-off-by: GalaxyGorilla <sascha@netdef.org>
This commit is contained in:
GalaxyGorilla 2020-11-12 12:53:49 +00:00
parent 385a1e07b1
commit 4ea5353bfd
1 changed files with 31 additions and 0 deletions
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31
ospfd/ospf_zebra.c
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@ -537,6 +537,7 @@ void ospf_zebra_update_prefix_sid(const struct sr_prefix *srp)
{
struct zapi_labels zl;
struct zapi_nexthop *znh;
struct zapi_nexthop *znh_backup;
struct listnode *node;
struct ospf_path *path;
@ -578,12 +579,42 @@ void ospf_zebra_update_prefix_sid(const struct sr_prefix *srp)
if (zl.nexthop_num >= MULTIPATH_NUM)
break;
/* TI-LFA backup path label stack comes first, if
* present */
if (path->srni.backup_label_stack) {
znh_backup = &zl.backup_nexthops
[zl.backup_nexthop_num++];
znh_backup->type = NEXTHOP_TYPE_IPV4_IFINDEX;
znh_backup->gate.ipv4 =
path->srni.backup_nexthop;
znh_backup->label_num =
path->srni.backup_label_stack
->num_labels;
memcpy(znh_backup->labels,
path->srni.backup_label_stack->label,
sizeof(mpls_label_t)
* znh_backup->label_num);
}
znh = &zl.nexthops[zl.nexthop_num++];
znh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
znh->gate.ipv4 = path->nexthop;
znh->ifindex = path->ifindex;
znh->label_num = 1;
znh->labels[0] = path->srni.label_out;
/* Set TI-LFA backup nexthop info if present */
if (path->srni.backup_label_stack) {
SET_FLAG(zl.message, ZAPI_LABELS_HAS_BACKUPS);
SET_FLAG(znh->flags,
ZAPI_NEXTHOP_FLAG_HAS_BACKUP);
/* Just care about a single TI-LFA backup path
* for now */
znh->backup_num = 1;
znh->backup_idx[0] = zl.backup_nexthop_num - 1;
}
}
break;
default: