ospfd: Add TI-LFA Prefix-SID Protection

Signed-off-by: GalaxyGorilla <sascha@netdef.org>

diff --git a/ospfd/ospf_zebra.c b/ospfd/ospf_zebra.c
index 84a2b63fbf4686bd9acf1c2977cc5b4052c39c9a..3922c44d9c13bb47c1dcbe78d302c14e1384c490 100644 (file)
--- a/ospfd/ospf_zebra.c
+++ b/ospfd/ospf_zebra.c
@@ -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: