diff options
Diffstat (limited to 'ospfd/ospf_sr.c')
| -rw-r--r-- | ospfd/ospf_sr.c | 2281 |
1 files changed, 2281 insertions, 0 deletions
diff --git a/ospfd/ospf_sr.c b/ospfd/ospf_sr.c new file mode 100644 index 0000000000..725bf952e5 --- /dev/null +++ b/ospfd/ospf_sr.c @@ -0,0 +1,2281 @@ +/* + * This is an implementation of Segment Routing + * as per draft draft-ietf-ospf-segment-routing-extensions-24 + * + * Module name: Segment Routing + * + * Author: Olivier Dugeon <olivier.dugeon@orange.com> + * Author: Anselme Sawadogo <anselmesawadogo@gmail.com> + * + * Copyright (C) 2016 - 2018 Orange Labs http://www.orange.com + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; see the file COPYING; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <math.h> +#include <stdio.h> +#include <stdlib.h> +#include <zebra.h> + +#include "command.h" +#include "hash.h" +#include "if.h" +#include "if.h" +#include "jhash.h" +#include "libospf.h" /* for ospf interface types */ +#include "linklist.h" +#include "log.h" +#include "memory.h" +#include "monotime.h" +#include "network.h" +#include "prefix.h" +#include "sockunion.h" /* for inet_aton() */ +#include "stream.h" +#include "table.h" +#include "thread.h" +#include "vty.h" +#include "zclient.h" + +#include "ospfd/ospfd.h" +#include "ospfd/ospf_interface.h" +#include "ospfd/ospf_ism.h" +#include "ospfd/ospf_asbr.h" +#include "ospfd/ospf_lsa.h" +#include "ospfd/ospf_lsdb.h" +#include "ospfd/ospf_neighbor.h" +#include "ospfd/ospf_nsm.h" +#include "ospfd/ospf_flood.h" +#include "ospfd/ospf_packet.h" +#include "ospfd/ospf_spf.h" +#include "ospfd/ospf_dump.h" +#include "ospfd/ospf_route.h" +#include "ospfd/ospf_ase.h" +#include "ospfd/ospf_sr.h" +#include "ospfd/ospf_ri.h" +#include "ospfd/ospf_ext.h" +#include "ospfd/ospf_zebra.h" + +/* + * Global variable to manage Segment Routing on this node. + * Note that all parameter values are stored in network byte order. + */ +static struct ospf_sr_db OspfSR; +static void ospf_sr_register_vty(void); +static inline void del_sid_nhlfe(struct sr_nhlfe nhlfe); + +/* + * Segment Routing Data Base functions + */ + +/* Hash function for Segment Routing entry */ +static unsigned int sr_hash(void *p) +{ + const struct in_addr *rid = p; + + return jhash_1word(rid->s_addr, 0); +} + +/* Compare 2 Router ID hash entries based on SR Node */ +static int sr_cmp(const void *p1, const void *p2) +{ + const struct sr_node *srn = p1; + const struct in_addr *rid = p2; + + return IPV4_ADDR_SAME(&srn->adv_router, rid); +} + +/* Functions to remove an SR Link */ +static void del_sr_link(void *val) +{ + struct sr_link *srl = (struct sr_link *)val; + + del_sid_nhlfe(srl->nhlfe[0]); + del_sid_nhlfe(srl->nhlfe[1]); + XFREE(MTYPE_OSPF_SR_PARAMS, val); + +} + +/* Functions to remove an SR Prefix */ +static void del_sr_pref(void *val) +{ + struct sr_prefix *srp = (struct sr_prefix *)val; + + del_sid_nhlfe(srp->nhlfe); + XFREE(MTYPE_OSPF_SR_PARAMS, val); + +} + +/* Allocate new Segment Routine node */ +static struct sr_node *sr_node_new(struct in_addr *rid) +{ + + if (rid == NULL) + return NULL; + + struct sr_node *new; + + /* Allocate Segment Routing node memory */ + new = XCALLOC(MTYPE_OSPF_SR_PARAMS, sizeof(struct sr_node)); + + /* Sanity Check */ + if (new == NULL) { + zlog_err("SR (%s): Abort! can't create new SR node", __func__); + return NULL; + } + + /* Default Algorithm, SRGB and MSD */ + for (int i = 0; i < ALGORITHM_COUNT; i++) + new->algo[i] = SR_ALGORITHM_UNSET; + + new->srgb.range_size = 0; + new->srgb.lower_bound = 0; + new->msd = 0; + + /* Create Link, Prefix and Range TLVs list */ + new->ext_link = list_new(); + new->ext_prefix = list_new(); + new->ext_link->del = del_sr_link; + new->ext_prefix->del = del_sr_pref; + + /* Check if list are correctly created */ + if (new->ext_link == NULL || new->ext_prefix == NULL) { + list_delete_original(new->ext_link); + list_delete_original(new->ext_prefix); + XFREE(MTYPE_OSPF_SR_PARAMS, new); + return NULL; + } + + IPV4_ADDR_COPY(&new->adv_router, rid); + new->neighbor = NULL; + new->instance = 0; + + if (IS_DEBUG_OSPF_SR) + zlog_debug(" |- Created new SR node for %s", + inet_ntoa(new->adv_router)); + return new; +} + +/* Delete Segment Routing node */ +static void sr_node_del(struct sr_node *srn) +{ + /* Sanity Check */ + if (srn == NULL) + return; + + /* Clean Extended Link */ + list_delete_and_null(&srn->ext_link); + + /* Clean Prefix List */ + list_delete_and_null(&srn->ext_prefix); + + XFREE(MTYPE_OSPF_SR_PARAMS, srn); +} + +/* Get SR Node for a given nexthop */ +static struct sr_node *get_sr_node_by_nexthop(struct ospf *ospf, + struct in_addr nexthop) +{ + struct ospf_interface *oi = NULL; + struct ospf_neighbor *nbr = NULL; + struct listnode *node; + struct route_node *rn; + struct sr_node *srn; + bool found; + + /* Sanity check */ + if (OspfSR.neighbors == NULL) + return NULL; + + if (IS_DEBUG_OSPF_SR) + zlog_debug(" |- Search SR-Node for nexthop %s", + inet_ntoa(nexthop)); + + /* First, search neighbor Router ID for this nexthop */ + found = false; + for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, node, oi)) { + for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) { + nbr = rn->info; + if ((nbr) && (IPV4_ADDR_SAME(&nexthop, &nbr->src))) { + found = true; + break; + } + } + if (found) + break; + } + + if (!found) + return NULL; + + if (IS_DEBUG_OSPF_SR) + zlog_debug(" |- Found nexthop Router ID %s", + inet_ntoa(nbr->router_id)); + /* Then, search SR Node */ + srn = (struct sr_node *)hash_lookup(OspfSR.neighbors, &nbr->router_id); + + return srn; +} + +/* + * Segment Routing Initialization functions + */ + +/* Segment Routing starter function */ +static int ospf_sr_start(struct ospf *ospf) +{ + struct route_node *rn; + struct ospf_lsa *lsa; + struct sr_node *srn; + int rc = 0; + + if (IS_DEBUG_OSPF_SR) + zlog_debug("SR (%s): Start Segment Routing", __func__); + + /* Initialize self SR Node */ + srn = hash_get(OspfSR.neighbors, (void *)&(ospf->router_id), + (void *)sr_node_new); + + /* Sanity Check */ + if (srn == NULL) + return rc; + + /* Complete & Store self SR Node */ + srn->srgb.range_size = OspfSR.srgb.range_size; + srn->srgb.lower_bound = OspfSR.srgb.lower_bound; + srn->algo[0] = OspfSR.algo[0]; + srn->msd = OspfSR.msd; + OspfSR.self = srn; + + if (IS_DEBUG_OSPF_EVENT) + zlog_debug("SR (%s): Update SR-DB from LSDB", __func__); + + /* Start by looking to Router Info & Extended LSA in lsdb */ + if ((ospf != NULL) && (ospf->backbone != NULL)) { + LSDB_LOOP(OPAQUE_AREA_LSDB(ospf->backbone), rn, lsa) + { + if (IS_LSA_MAXAGE(lsa) || IS_LSA_SELF(lsa)) + continue; + int lsa_id = + GET_OPAQUE_TYPE(ntohl(lsa->data->id.s_addr)); + switch (lsa_id) { + case OPAQUE_TYPE_ROUTER_INFORMATION_LSA: + ospf_sr_ri_lsa_update(lsa); + break; + case OPAQUE_TYPE_EXTENDED_PREFIX_LSA: + ospf_sr_ext_prefix_lsa_update(lsa); + break; + case OPAQUE_TYPE_EXTENDED_LINK_LSA: + ospf_sr_ext_link_lsa_update(lsa); + break; + default: + break; + } + } + } + + rc = 1; + return rc; +} + +/* Stop Segment Routing */ +static void ospf_sr_stop(void) +{ + + if (IS_DEBUG_OSPF_SR) + zlog_debug("SR (%s): Stop Segment Routing", __func__); + + /* + * Remove all SR Nodes from the Hash table. Prefix and Link SID will + * be remove though list_delete_and_null() call. See sr_node_del() + */ + hash_clean(OspfSR.neighbors, (void *)sr_node_del); +} + +/* + * Segment Routing initialize function + * + * @param - nothing + * + * @return 0 if OK, -1 otherwise + */ +int ospf_sr_init(void) +{ + int rc = -1; + + zlog_info("SR (%s): Initialize SR Data Base", __func__); + + memset(&OspfSR, 0, sizeof(struct ospf_sr_db)); + OspfSR.enabled = false; + /* Only AREA flooding is supported in this release */ + OspfSR.scope = OSPF_OPAQUE_AREA_LSA; + + /* Initialize SRGB, Algorithms and MSD TLVs */ + /* Only Algorithm SPF is supported */ + OspfSR.algo[0] = SR_ALGORITHM_SPF; + for (int i = 1; i < ALGORITHM_COUNT; i++) + OspfSR.algo[i] = SR_ALGORITHM_UNSET; + + OspfSR.srgb.range_size = MPLS_DEFAULT_MAX_SRGB_SIZE; + OspfSR.srgb.lower_bound = MPLS_DEFAULT_MIN_SRGB_LABEL; + OspfSR.msd = 0; + + /* Initialize Hash table for neighbor SR nodes */ + OspfSR.neighbors = hash_create(sr_hash, sr_cmp, "OSPF_SR"); + if (OspfSR.neighbors == NULL) + return rc; + + /* Initialize Route Table for prefix */ + OspfSR.prefix = route_table_init(); + if (OspfSR.prefix == NULL) + return rc; + + /* Register Segment Routing VTY command */ + ospf_sr_register_vty(); + + rc = 0; + return rc; +} + +/* + * Segment Routing termination function + * + * @param - nothing + * @return - nothing + */ +void ospf_sr_term(void) +{ + + /* Stop Segment Routing */ + ospf_sr_stop(); + + /* Clear SR Node Table */ + if (OspfSR.neighbors) + hash_free(OspfSR.neighbors); + + /* Clear Prefix Table */ + if (OspfSR.prefix) + route_table_finish(OspfSR.prefix); + + OspfSR.enabled = false; + OspfSR.self = NULL; +} + +/* + * Segment Routing finish function + * + * @param - nothing + * @return - nothing + */ +void ospf_sr_finish(void) +{ + /* Stop Segment Routing */ + ospf_sr_stop(); + + OspfSR.enabled = false; +} + +/* + * Following functions are used to manipulate the + * Next Hop Label Forwarding entry (NHLFE) + */ + +/* Compute label from index */ +static mpls_label_t index2label(uint32_t index, struct sr_srgb srgb) +{ + mpls_label_t label; + + label = srgb.lower_bound + index; + if (label > (srgb.lower_bound + srgb.range_size)) + return MPLS_INVALID_LABEL; + else + return label; +} + +/* Get neighbor full structure from address */ +static struct ospf_neighbor *get_neighbor_by_addr(struct ospf *top, + struct in_addr addr) +{ + struct ospf_neighbor *nbr; + struct ospf_interface *oi; + struct listnode *node; + struct route_node *rn; + + /* Sanity Check */ + if (top == NULL) + return NULL; + + for (ALL_LIST_ELEMENTS_RO(top->oiflist, node, oi)) + for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) { + nbr = rn->info; + if (nbr) + if (IPV4_ADDR_SAME(&nbr->address.u.prefix4, + &addr) + || IPV4_ADDR_SAME(&nbr->router_id, &addr)) { + route_unlock_node(rn); + return nbr; + } + } + return NULL; +} + +/* Get OSPF Path from address */ +static struct ospf_path *get_nexthop_by_addr(struct ospf *top, + struct prefix_ipv4 p) +{ + struct ospf_route *or; + struct ospf_path *path; + struct listnode *node; + struct route_node *rn; + + /* Sanity Check */ + if ((top == NULL) && (top->new_table)) + return NULL; + + if (IS_DEBUG_OSPF_SR) + zlog_debug(" |- Search Nexthop for prefix %s/%u", + inet_ntoa(p.prefix), p.prefixlen); + + rn = route_node_lookup(top->new_table, (struct prefix *)&p); + + /* + * Check if we found an OSPF route. May be NULL if SPF has not + * yet populate routing table for this prefix. + */ + if (rn == NULL) + return NULL; + + route_unlock_node(rn); + or = rn->info; + if (or == NULL) + return NULL; + + /* Then search path from this route */ + for (ALL_LIST_ELEMENTS_RO(or->paths, node, path)) + if (path->nexthop.s_addr != INADDR_ANY || path->ifindex != 0) + return path; + + return NULL; +} + +/* Compute NHLFE entry for Extended Link */ +static int compute_link_nhlfe(struct sr_link *srl) +{ + struct ospf *top = ospf_lookup_by_vrf_id(VRF_DEFAULT); + struct ospf_neighbor *nh; + int rc = 0; + + if (IS_DEBUG_OSPF_SR) + zlog_debug(" |- Compute NHLFE for link %s/%u", + inet_ntoa(srl->nhlfe[0].prefv4.prefix), + srl->nhlfe[0].prefv4.prefixlen); + + /* First determine the OSPF Neighbor */ + nh = get_neighbor_by_addr(top, srl->nhlfe[0].nexthop); + + /* Neighbor could be not found when OSPF Adjacency just fire up + * because SPF don't yet populate routing table. This NHLFE will + * be fixed later when SR SPF schedule will be called. + */ + if (nh == NULL) + return rc; + + if (IS_DEBUG_OSPF_SR) + zlog_debug(" |- Found nexthop NHLFE %s", + inet_ntoa(nh->router_id)); + + /* Set ifindex for this neighbor */ + srl->nhlfe[0].ifindex = nh->oi->ifp->ifindex; + srl->nhlfe[1].ifindex = nh->oi->ifp->ifindex; + + /* Set Input & Output Label */ + if (CHECK_FLAG(srl->flags[0], EXT_SUBTLV_LINK_ADJ_SID_VFLG)) + srl->nhlfe[0].label_in = srl->sid[0]; + else + srl->nhlfe[0].label_in = + index2label(srl->sid[0], srl->srn->srgb); + if (CHECK_FLAG(srl->flags[1], EXT_SUBTLV_LINK_ADJ_SID_VFLG)) + srl->nhlfe[1].label_in = srl->sid[1]; + else + srl->nhlfe[1].label_in = + index2label(srl->sid[1], srl->srn->srgb); + + srl->nhlfe[0].label_out = MPLS_IMP_NULL_LABEL; + srl->nhlfe[1].label_out = MPLS_IMP_NULL_LABEL; + + rc = 1; + return rc; +} + +/* + * Compute NHLFE entry for Extended Prefix + * + * @param srp - Segment Routing Prefix + * + * @return -1 if next hop is not found, 0 if nexthop has not changed + * and 1 if success + */ +static int compute_prefix_nhlfe(struct sr_prefix *srp) +{ + struct ospf *top = ospf_lookup_by_vrf_id(VRF_DEFAULT); + struct ospf_path *nh = NULL; + struct sr_node *srnext; + int rc = -1; + + if (IS_DEBUG_OSPF_SR) + zlog_debug(" |- Compute NHLFE for prefix %s/%u", + inet_ntoa(srp->nhlfe.prefv4.prefix), + srp->nhlfe.prefv4.prefixlen); + + /* First determine the nexthop */ + nh = get_nexthop_by_addr(top, srp->nhlfe.prefv4); + + /* Nexthop could be not found when OSPF Adjacency just fire up + * because SPF don't yet populate routing table. This NHLFE will + * be fixed later when SR SPF schedule will be called. + */ + if (nh == NULL) + return rc; + + /* Check if NextHop has changed when call after running a new SPF */ + if (IPV4_ADDR_SAME(&nh->nexthop, &srp->nhlfe.nexthop) + && (nh->ifindex == srp->nhlfe.ifindex)) + return 0; + + if (IS_DEBUG_OSPF_SR) + zlog_debug(" |- Found new next hop for this NHLFE: %s", + inet_ntoa(nh->nexthop)); + + /* + * Get SR-Node for this nexthop. Could be not yet available + * as Extende Link / Prefix and Router Information are flooded + * after LSA Type 1 & 2 which populate the OSPF Route Table + */ + srnext = get_sr_node_by_nexthop(top, nh->nexthop); + if (srnext == NULL) + return rc; + + /* And store this information for later update if SR Node is found */ + srnext->neighbor = OspfSR.self; + if (IPV4_ADDR_SAME(&srnext->adv_router, &srp->adv_router)) + srp->nexthop = NULL; + else + srp->nexthop = srnext; + + /* + * SR Node could be known, but SRGB could be not initialize + * This is due to the fact that Extended Link / Prefix could + * be received before corresponding Router Information LSA + */ + if ((srnext == NULL) || (srnext->srgb.lower_bound == 0) + || (srnext->srgb.range_size == 0)) + return rc; + + if (IS_DEBUG_OSPF_SR) + zlog_debug(" |- Found SRGB %u/%u for next hop SR-Node %s", + srnext->srgb.range_size, srnext->srgb.lower_bound, + inet_ntoa(srnext->adv_router)); + + /* Set ip addr & ifindex for this neighbor */ + IPV4_ADDR_COPY(&srp->nhlfe.nexthop, &nh->nexthop); + srp->nhlfe.ifindex = nh->ifindex; + + /* Compute Input Label with self SRGB */ + srp->nhlfe.label_in = index2label(srp->sid, OspfSR.srgb); + /* + * and Output Label with Next hop SR Node SRGB or Implicit Null label + * if next hop is the destination and request PHP + */ + if ((srp->nexthop == NULL) + && (!CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_NPFLG))) + srp->nhlfe.label_out = MPLS_IMP_NULL_LABEL; + else if (CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_VFLG)) + srp->nhlfe.label_out = srp->sid; + else + srp->nhlfe.label_out = index2label(srp->sid, srnext->srgb); + + if (IS_DEBUG_OSPF_SR) + zlog_debug(" |- Computed new labels in: %u out: %u", + srp->nhlfe.label_in, srp->nhlfe.label_out); + + rc = 1; + return rc; +} + +/* Send MPLS Label entry to Zebra for installation or deletion */ +static int ospf_zebra_send_mpls_labels(int cmd, struct sr_nhlfe nhlfe) +{ + struct stream *s; + + /* Reset stream. */ + s = zclient->obuf; + stream_reset(s); + + zclient_create_header(s, cmd, VRF_DEFAULT); + stream_putc(s, ZEBRA_LSP_SR); + /* OSPF Segment Routing currently support only IPv4 */ + stream_putl(s, nhlfe.prefv4.family); + stream_put_in_addr(s, &nhlfe.prefv4.prefix); + stream_putc(s, nhlfe.prefv4.prefixlen); + stream_put_in_addr(s, &nhlfe.nexthop); + stream_putl(s, nhlfe.ifindex); + stream_putc(s, OSPF_SR_PRIORITY_DEFAULT); + stream_putl(s, nhlfe.label_in); + stream_putl(s, nhlfe.label_out); + + /* Put length at the first point of the stream. */ + stream_putw_at(s, 0, stream_get_endp(s)); + + if (IS_DEBUG_OSPF_SR) + zlog_debug(" |- %s LSP %u/%u for %s/%u via %u", + cmd == ZEBRA_MPLS_LABELS_ADD ? "Add" : "Delete", + nhlfe.label_in, nhlfe.label_out, + inet_ntoa(nhlfe.prefv4.prefix), + nhlfe.prefv4.prefixlen, nhlfe.ifindex); + + return zclient_send_message(zclient); +} + +/* Request zebra to install/remove FEC in FIB */ +static int ospf_zebra_send_mpls_ftn(int cmd, struct sr_nhlfe nhlfe) +{ + struct zapi_route api; + struct zapi_nexthop *api_nh; + + /* Support only IPv4 */ + if (nhlfe.prefv4.family != AF_INET) + return -1; + + memset(&api, 0, sizeof(api)); + api.vrf_id = VRF_DEFAULT; + api.type = ZEBRA_ROUTE_OSPF; + api.safi = SAFI_UNICAST; + memcpy(&api.prefix, &nhlfe.prefv4, sizeof(struct prefix_ipv4)); + + if (cmd == ZEBRA_ROUTE_ADD) { + /* Metric value. */ + SET_FLAG(api.message, ZAPI_MESSAGE_METRIC); + api.metric = OSPF_SR_DEFAULT_METRIC; + /* Nexthop */ + SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP); + api_nh = &api.nexthops[0]; + IPV4_ADDR_COPY(&api_nh->gate.ipv4, &nhlfe.nexthop); + api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX; + api_nh->ifindex = nhlfe.ifindex; + /* MPLS labels */ + SET_FLAG(api.message, ZAPI_MESSAGE_LABEL); + api_nh->labels[0] = nhlfe.label_out; + api_nh->label_num = 1; + api.nexthop_num = 1; + } + + if (IS_DEBUG_OSPF_SR) + zlog_debug(" |- %s FEC %u for %s/%u via %u", + cmd == ZEBRA_ROUTE_ADD ? "Add" : "Delete", + nhlfe.label_out, inet_ntoa(nhlfe.prefv4.prefix), + nhlfe.prefv4.prefixlen, nhlfe.ifindex); + + return zclient_route_send(cmd, zclient, &api); +} + +/* Add new NHLFE entry for SID */ +static inline void add_sid_nhlfe(struct sr_nhlfe nhlfe) +{ + if ((nhlfe.label_in != 0) && (nhlfe.label_out != 0)) { + ospf_zebra_send_mpls_labels(ZEBRA_MPLS_LABELS_ADD, nhlfe); + if (nhlfe.label_out != MPLS_IMP_NULL_LABEL) + ospf_zebra_send_mpls_ftn(ZEBRA_ROUTE_ADD, nhlfe); + } +} + +/* Remove NHLFE entry for SID */ +static inline void del_sid_nhlfe(struct sr_nhlfe nhlfe) +{ + if ((nhlfe.label_in != 0) && (nhlfe.label_out != 0)) { + ospf_zebra_send_mpls_labels(ZEBRA_MPLS_LABELS_DELETE, nhlfe); + if (nhlfe.label_out != MPLS_IMP_NULL_LABEL) + ospf_zebra_send_mpls_ftn(ZEBRA_ROUTE_DELETE, nhlfe); + } +} + +/* Update NHLFE entry for SID */ +static inline void update_sid_nhlfe(struct sr_nhlfe n1, struct sr_nhlfe n2) +{ + + del_sid_nhlfe(n1); + add_sid_nhlfe(n2); +} + +/* + * Functions to parse and get Extended Link / Prefix + * TLVs and SubTLVs + */ + +/* Extended Link SubTLVs Getter */ +static struct sr_link *get_ext_link_sid(struct tlv_header *tlvh) +{ + + struct sr_link *srl; + struct ext_tlv_link *link = (struct ext_tlv_link *)tlvh; + struct ext_subtlv_adj_sid *adj_sid; + struct ext_subtlv_lan_adj_sid *lan_sid; + struct ext_subtlv_rmt_itf_addr *rmt_itf; + + struct tlv_header *sub_tlvh; + uint16_t length = 0, sum = 0, i = 0; + + srl = XCALLOC(MTYPE_OSPF_SR_PARAMS, sizeof(struct sr_link)); + + if (srl == NULL) + return NULL; + + /* Initialize TLV browsing */ + length = ntohs(tlvh->length) - EXT_TLV_LINK_SIZE; + sub_tlvh = (struct tlv_header *)((char *)(tlvh) + TLV_HDR_SIZE + + EXT_TLV_LINK_SIZE); + for (; sum < length; sub_tlvh = TLV_HDR_NEXT(sub_tlvh)) { + switch (ntohs(sub_tlvh->type)) { + case EXT_SUBTLV_ADJ_SID: + adj_sid = (struct ext_subtlv_adj_sid *)sub_tlvh; + srl->type = ADJ_SID; + i = CHECK_FLAG(adj_sid->flags, + EXT_SUBTLV_LINK_ADJ_SID_BFLG) + ? 1 + : 0; + srl->flags[i] = adj_sid->flags; + if (CHECK_FLAG(adj_sid->flags, + EXT_SUBTLV_LINK_ADJ_SID_VFLG)) + srl->sid[i] = GET_LABEL(ntohl(adj_sid->value)); + else + srl->sid[i] = ntohl(adj_sid->value); + IPV4_ADDR_COPY(&srl->nhlfe[i].nexthop, &link->link_id); + break; + case EXT_SUBTLV_LAN_ADJ_SID: + lan_sid = (struct ext_subtlv_lan_adj_sid *)sub_tlvh; + srl->type = LAN_ADJ_SID; + i = CHECK_FLAG(lan_sid->flags, + EXT_SUBTLV_LINK_ADJ_SID_BFLG) + ? 1 + : 0; + srl->flags[i] = lan_sid->flags; + if (CHECK_FLAG(lan_sid->flags, + EXT_SUBTLV_LINK_ADJ_SID_VFLG)) + srl->sid[i] = GET_LABEL(ntohl(lan_sid->value)); + else + srl->sid[i] = ntohl(lan_sid->value); + IPV4_ADDR_COPY(&srl->nhlfe[i].nexthop, + &lan_sid->neighbor_id); + break; + case EXT_SUBTLV_RMT_ITF_ADDR: + rmt_itf = (struct ext_subtlv_rmt_itf_addr *)sub_tlvh; + IPV4_ADDR_COPY(&srl->nhlfe[0].nexthop, &rmt_itf->value); + IPV4_ADDR_COPY(&srl->nhlfe[1].nexthop, &rmt_itf->value); + break; + default: + break; + } + sum += TLV_SIZE(sub_tlvh); + } + + IPV4_ADDR_COPY(&srl->nhlfe[0].prefv4.prefix, &link->link_data); + srl->nhlfe[0].prefv4.prefixlen = IPV4_MAX_PREFIXLEN; + srl->nhlfe[0].prefv4.family = AF_INET; + apply_mask_ipv4(&srl->nhlfe[0].prefv4); + IPV4_ADDR_COPY(&srl->nhlfe[1].prefv4.prefix, &link->link_data); + srl->nhlfe[1].prefv4.prefixlen = IPV4_MAX_PREFIXLEN; + srl->nhlfe[1].prefv4.family = AF_INET; + apply_mask_ipv4(&srl->nhlfe[1].prefv4); + + if (IS_DEBUG_OSPF_SR) { + zlog_debug(" |- Found primary Adj/Lan Sid %u for %s/%u", + srl->sid[0], inet_ntoa(srl->nhlfe[0].prefv4.prefix), + srl->nhlfe[0].prefv4.prefixlen); + zlog_debug(" |- Found backup Adj/Lan Sid %u for %s/%u", + srl->sid[1], inet_ntoa(srl->nhlfe[1].prefv4.prefix), + srl->nhlfe[1].prefv4.prefixlen); + } + + return srl; +} + +/* Extended Prefix SubTLVs Getter */ +static struct sr_prefix *get_ext_prefix_sid(struct tlv_header *tlvh) +{ + + struct sr_prefix *srp; + struct ext_tlv_prefix *pref = (struct ext_tlv_prefix *)tlvh; + struct ext_subtlv_prefix_sid *psid; + + struct tlv_header *sub_tlvh; + uint16_t length = 0, sum = 0; + + srp = XCALLOC(MTYPE_OSPF_SR_PARAMS, sizeof(struct sr_prefix)); + + if (srp == NULL) + return NULL; + + /* Initialize TLV browsing */ + length = ntohs(tlvh->length) - EXT_TLV_PREFIX_SIZE; + sub_tlvh = (struct tlv_header *)((char *)(tlvh) + TLV_HDR_SIZE + + EXT_TLV_PREFIX_SIZE); + for (; sum < length; sub_tlvh = TLV_HDR_NEXT(sub_tlvh)) { + switch (ntohs(sub_tlvh->type)) { + case EXT_SUBTLV_PREFIX_SID: + psid = (struct ext_subtlv_prefix_sid *)sub_tlvh; + if (psid->algorithm != SR_ALGORITHM_SPF) { + zlog_err( + "SR (%s): Unsupported Algorithm", + __func__); + XFREE(MTYPE_OSPF_SR_PARAMS, srp); + return NULL; + } + srp->type = PREF_SID; + srp->flags = psid->flags; + if (CHECK_FLAG(psid->flags, EXT_SUBTLV_PREFIX_SID_VFLG)) + srp->sid = GET_LABEL(ntohl(psid->value)); + else + srp->sid = ntohl(psid->value); + IPV4_ADDR_COPY(&srp->nhlfe.prefv4.prefix, + &pref->address); + srp->nhlfe.prefv4.prefixlen = pref->pref_length; + srp->nhlfe.prefv4.family = AF_INET; + apply_mask_ipv4(&srp->nhlfe.prefv4); + break; + default: + break; + } + sum += TLV_SIZE(sub_tlvh); + } + + if (IS_DEBUG_OSPF_SR) + zlog_debug(" |- Found SID %u for prefix %s/%u", srp->sid, + inet_ntoa(srp->nhlfe.prefv4.prefix), + srp->nhlfe.prefv4.prefixlen); + return srp; +} + +/* + * Functions to manipulate Segment Routing Link & Prefix structures + */ + +/* Compare two Segment Link: return 0 if equal, 1 otherwise */ +static inline int sr_link_cmp(struct sr_link *srl1, struct sr_link *srl2) +{ + if ((srl1->sid[0] == srl2->sid[0]) && (srl1->sid[1] == srl2->sid[1]) + && (srl1->type == srl2->type) && (srl1->flags[0] == srl2->flags[0]) + && (srl1->flags[1] == srl2->flags[1])) + return 0; + else + return 1; +} + +/* Compare two Segment Prefix: return 0 if equal, 1 otherwise */ +static inline int sr_prefix_cmp(struct sr_prefix *srp1, struct sr_prefix *srp2) +{ + if ((srp1->sid == srp2->sid) && (srp1->flags == srp2->flags)) + return 0; + else + return 1; +} + +/* Update Segment Link of given Segment Routing Node */ +static void update_ext_link_sid(struct sr_node *srn, struct sr_link *srl, + u_char lsa_flags) +{ + struct listnode *node; + struct sr_link *lk; + bool found = false; + + /* Sanity check */ + if ((srn == NULL) || (srl == NULL)) + return; + + if (IS_DEBUG_OSPF_SR) + zlog_debug(" |- Process Extended Link Adj/Lan-SID"); + + /* Process only Local Adj/Lan_Adj SID coming from LSA SELF */ + if (!CHECK_FLAG(srl->flags[0], EXT_SUBTLV_LINK_ADJ_SID_LFLG) + || !CHECK_FLAG(srl->flags[1], EXT_SUBTLV_LINK_ADJ_SID_LFLG) + || !CHECK_FLAG(lsa_flags, OSPF_LSA_SELF)) + return; + + /* Search for existing Segment Link */ + for (ALL_LIST_ELEMENTS_RO(srn->ext_link, node, lk)) + if (lk->instance == srl->instance) { + found = true; + break; + } + + if (IS_DEBUG_OSPF_SR) + zlog_debug(" |- %s SR Link 8.0.0.%u for SR node %s", + found ? "Update" : "Add", + GET_OPAQUE_ID(srl->instance), + inet_ntoa(srn->adv_router)); + + /* if not found, add new Segment Link and install NHLFE */ + if (!found) { + /* Complete SR-Link and add it to SR-Node list */ + srl->srn = srn; + IPV4_ADDR_COPY(&srl->adv_router, &srn->adv_router); + listnode_add(srn->ext_link, srl); + /* Try to set MPLS table */ + if (compute_link_nhlfe(srl)) { + add_sid_nhlfe(srl->nhlfe[0]); + add_sid_nhlfe(srl->nhlfe[1]); + } + } else { + if (sr_link_cmp(lk, srl)) { + if (compute_link_nhlfe(srl)) { + update_sid_nhlfe(lk->nhlfe[0], srl->nhlfe[0]); + update_sid_nhlfe(lk->nhlfe[1], srl->nhlfe[1]); + /* Replace Segment List */ + listnode_delete(srn->ext_link, lk); + XFREE(MTYPE_OSPF_SR_PARAMS, lk); + srl->srn = srn; + IPV4_ADDR_COPY(&srl->adv_router, + &srn->adv_router); + listnode_add(srn->ext_link, srl); + } else { + /* New NHLFE was not found. + * Just free the SR Link + */ + XFREE(MTYPE_OSPF_SR_PARAMS, srl); + } + } else { + /* + * This is just an LSA refresh. + * Stop processing and free SR Link + */ + XFREE(MTYPE_OSPF_SR_PARAMS, srl); + } + } +} + +/* Update Segment Prefix of given Segment Routing Node */ +static void update_ext_prefix_sid(struct sr_node *srn, struct sr_prefix *srp) +{ + + struct listnode *node; + struct sr_prefix *pref; + bool found = false; + + /* Sanity check */ + if (srn == NULL || srp == NULL) + return; + + if (IS_DEBUG_OSPF_SR) + zlog_debug(" |- Process Extended Prefix SID %u", srp->sid); + + /* Process only Global Prefix SID */ + if (CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_LFLG)) + return; + + /* Search for existing Segment Prefix */ + for (ALL_LIST_ELEMENTS_RO(srn->ext_prefix, node, pref)) + if (pref->instance == srp->instance) { + found = true; + break; + } + + if (IS_DEBUG_OSPF_SR) + zlog_debug(" |- %s SR LSA ID 7.0.0.%u for SR node %s", + found ? "Update" : "Add", + GET_OPAQUE_ID(srp->instance), + inet_ntoa(srn->adv_router)); + + /* if not found, add new Segment Prefix and install NHLFE */ + if (!found) { + /* Complete SR-Prefix and add it to SR-Node list */ + srp->srn = srn; + IPV4_ADDR_COPY(&srp->adv_router, &srn->adv_router); + listnode_add(srn->ext_prefix, srp); + /* Try to set MPLS table */ + if (compute_prefix_nhlfe(srp) == 1) + add_sid_nhlfe(srp->nhlfe); + } else { + if (sr_prefix_cmp(pref, srp)) { + if (compute_prefix_nhlfe(srp) == 1) { + update_sid_nhlfe(pref->nhlfe, srp->nhlfe); + /* Replace Segment Prefix */ + listnode_delete(srn->ext_prefix, pref); + XFREE(MTYPE_OSPF_SR_PARAMS, pref); + srp->srn = srn; + IPV4_ADDR_COPY(&srp->adv_router, + &srn->adv_router); + listnode_add(srn->ext_prefix, srp); + } else { + /* New NHLFE was not found. + * Just free the SR Prefix + */ + XFREE(MTYPE_OSPF_SR_PARAMS, srp); + } + } else { + /* This is just an LSA refresh. + * Stop processing and free SR Prefix + */ + XFREE(MTYPE_OSPF_SR_PARAMS, srp); + } + } +} + +/* + * When change the FRR Self SRGB, update the NHLFE Input Label + * for all Extended Prefix with SID index through hash_iterate() + */ +static void update_in_nhlfe(struct hash_backet *backet, void *args) +{ + struct listnode *node; + struct sr_node *srn = (struct sr_node *)backet->data; + struct sr_prefix *srp; + struct sr_nhlfe new; + + /* Process Every Extended Prefix for this SR-Node */ + for (ALL_LIST_ELEMENTS_RO(srn->ext_prefix, node, srp)) { + /* Process Self SRN only if NO-PHP is requested */ + if ((srn == OspfSR.self) + && !CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_NPFLG)) + continue; + + /* Process only SID Index */ + if (CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_VFLG)) + continue; + + /* OK. Compute new NHLFE */ + memcpy(&new, &srp->nhlfe, sizeof(struct sr_nhlfe)); + new.label_in = index2label(srp->sid, OspfSR.srgb); + /* Update MPLS LFIB */ + update_sid_nhlfe(srp->nhlfe, new); + /* Finally update Input Label */ + srp->nhlfe.label_in = new.label_in; + } +} + +/* + * When SRGB has changed, update NHLFE Output Label for all Extended Prefix + * with SID index which use the given SR-Node as nexthop though hash_iterate() + */ +static void update_out_nhlfe(struct hash_backet *backet, void *args) +{ + struct listnode *node; + struct sr_node *srn = (struct sr_node *)backet->data; + struct sr_node *srnext = (struct sr_node *)args; + struct sr_prefix *srp; + struct sr_nhlfe new; + + for (ALL_LIST_ELEMENTS_RO(srn->ext_prefix, node, srp)) { + /* Process only SID Index for next hop without PHP */ + if ((srp->nexthop == NULL) + && (!CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_NPFLG))) + continue; + memcpy(&new, &srp->nhlfe, sizeof(struct sr_nhlfe)); + new.label_out = index2label(srp->sid, srnext->srgb); + update_sid_nhlfe(srp->nhlfe, new); + srp->nhlfe.label_out = new.label_out; + } +} + +/* + * Following functions are call when new Segment Routing LSA are received + * - Router Information: ospf_sr_ri_lsa_update() & ospf_sr_ri_lsa_delete() + * - Extended Link: ospf_sr_ext_link_update() & ospf_sr_ext_link_delete() + * - Extended Prefix: ospf_ext_prefix_update() & ospf_sr_ext_prefix_delete() + */ + +/* Update Segment Routing from Router Information LSA */ +void ospf_sr_ri_lsa_update(struct ospf_lsa *lsa) +{ + struct sr_node *srn; + struct tlv_header *tlvh; + struct lsa_header *lsah = (struct lsa_header *)lsa->data; + struct ri_sr_tlv_sid_label_range *ri_srgb; + struct ri_sr_tlv_sr_algorithm *algo; + struct sr_srgb srgb; + uint16_t length = 0, sum = 0; + + if (IS_DEBUG_OSPF_SR) + zlog_debug( + "SR (%s): Process Router " + "Information LSA 4.0.0.%u from %s", + __func__, + GET_OPAQUE_ID(ntohl(lsah->id.s_addr)), + inet_ntoa(lsah->adv_router)); + + /* Sanity check */ + if (IS_LSA_SELF(lsa)) + return; + + if (OspfSR.neighbors == NULL) { + zlog_err("SR (%s): Abort! no valid SR DataBase", __func__); + return; + } + + /* Get SR Node in hash table from Router ID */ + srn = hash_get(OspfSR.neighbors, (void *)&(lsah->adv_router), + (void *)sr_node_new); + + /* Sanity check */ + if (srn == NULL) { + zlog_err( + "SR (%s): Abort! can't create SR node in hash table", + __func__); + return; + } + + if ((srn->instance != 0) && (srn->instance != ntohl(lsah->id.s_addr))) { + zlog_err( + "SR (%s): Abort! Wrong " + "LSA ID 4.0.0.%u for SR node %s/%u", + __func__, + GET_OPAQUE_ID(ntohl(lsah->id.s_addr)), + inet_ntoa(lsah->adv_router), srn->instance); + return; + } + + /* Collect Router Information Sub TLVs */ + /* Initialize TLV browsing */ + length = ntohs(lsah->length) - OSPF_LSA_HEADER_SIZE; + srgb.range_size = 0; + srgb.lower_bound = 0; + + for (tlvh = TLV_HDR_TOP(lsah); (sum < length) && (tlvh != NULL); + tlvh = TLV_HDR_NEXT(tlvh)) { + switch (ntohs(tlvh->type)) { + case RI_SR_TLV_SR_ALGORITHM: + algo = (struct ri_sr_tlv_sr_algorithm *)tlvh; + int i; + + for (i = 0; i < ntohs(algo->header.length); i++) + srn->algo[i] = algo->value[0]; + for (; i < ALGORITHM_COUNT; i++) + srn->algo[i] = SR_ALGORITHM_UNSET; + sum += TLV_SIZE(tlvh); + break; + case RI_SR_TLV_SID_LABEL_RANGE: + ri_srgb = (struct ri_sr_tlv_sid_label_range *)tlvh; + srgb.range_size = GET_RANGE_SIZE(ntohl(ri_srgb->size)); + srgb.lower_bound = + GET_LABEL(ntohl(ri_srgb->lower.value)); + sum += TLV_SIZE(tlvh); + break; + case RI_SR_TLV_NODE_MSD: + srn->msd = ((struct ri_sr_tlv_node_msd *)(tlvh))->value; + sum += TLV_SIZE(tlvh); + break; + default: + sum += TLV_SIZE(tlvh); + break; + } + } + + /* Check that we collect mandatory parameters */ + if (srn->algo[0] == SR_ALGORITHM_UNSET || srgb.range_size == 0 + || srgb.lower_bound == 0) { + zlog_warn( + "SR (%s): Missing mandatory parameters. Abort!", + __func__); + hash_release(OspfSR.neighbors, &(srn->adv_router)); + XFREE(MTYPE_OSPF_SR_PARAMS, srn); + return; + } + + /* Check if it is a new SR Node or not */ + if (srn->instance == 0) { + /* update LSA ID */ + srn->instance = ntohl(lsah->id.s_addr); + /* Copy SRGB */ + srn->srgb.range_size = srgb.range_size; + srn->srgb.lower_bound = srgb.lower_bound; + } + + /* Check if SRGB has changed */ + if ((srn->srgb.range_size != srgb.range_size) + || (srn->srgb.lower_bound != srgb.lower_bound)) { + srn->srgb.range_size = srgb.range_size; + srn->srgb.lower_bound = srgb.lower_bound; + /* Update NHLFE if it is a neighbor SR node */ + if (srn->neighbor == OspfSR.self) + hash_iterate(OspfSR.neighbors, + (void (*)(struct hash_backet *, + void *))update_out_nhlfe, + (void *)srn); + } + +} + +/* + * Delete SR Node entry in hash table information corresponding to an expired + * Router Information LSA + */ +void ospf_sr_ri_lsa_delete(struct ospf_lsa *lsa) +{ + struct sr_node *srn; + struct lsa_header *lsah = (struct lsa_header *)lsa->data; + + if (IS_DEBUG_OSPF_SR) + zlog_debug( + "SR (%s): Remove SR node %s from lsa_id 4.0.0.%u", + __func__, inet_ntoa(lsah->adv_router), + GET_OPAQUE_ID(ntohl(lsah->id.s_addr))); + + /* Sanity check */ + if (OspfSR.neighbors == NULL) { + zlog_err("SR (%s): Abort! no valid SR Data Base", __func__); + return; + } + + /* Release Router ID entry in SRDB hash table */ + srn = hash_release(OspfSR.neighbors, &(lsah->adv_router)); + + /* Sanity check */ + if (srn == NULL) { + zlog_err( + "SR (%s): Abort! no entry in SRDB for SR Node %s", + __func__, inet_ntoa(lsah->adv_router)); + return; + } + + if ((srn->instance != 0) && (srn->instance != ntohl(lsah->id.s_addr))) { + zlog_err( + "SR (%s): Abort! Wrong LSA ID 4.0.0.%u for SR node %s", + __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)), + inet_ntoa(lsah->adv_router)); + return; + } + + /* Remove SR node */ + sr_node_del(srn); + +} + +/* Update Segment Routing from Extended Link LSA */ +void ospf_sr_ext_link_lsa_update(struct ospf_lsa *lsa) +{ + struct sr_node *srn; + struct tlv_header *tlvh; + struct lsa_header *lsah = (struct lsa_header *)lsa->data; + struct sr_link *srl; + + uint16_t length, sum; + + if (IS_DEBUG_OSPF_SR) + zlog_debug( + "SR (%s): Process Extended Link LSA 8.0.0.%u from %s", + __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)), + inet_ntoa(lsah->adv_router)); + + /* Sanity check */ + if (OspfSR.neighbors == NULL) { + zlog_err("SR (%s): Abort! no valid SR DataBase", __func__); + return; + } + + /* Get SR Node in hash table from Router ID */ + srn = (struct sr_node *)hash_get(OspfSR.neighbors, + (void *)&(lsah->adv_router), + (void *)sr_node_new); + + /* Sanity check */ + if (srn == NULL) { + zlog_err( + "SR (%s): Abort! can't create SR node in hash table", + __func__); + return; + } + + /* Initialize TLV browsing */ + length = ntohs(lsah->length) - OSPF_LSA_HEADER_SIZE; + sum = 0; + for (tlvh = TLV_HDR_TOP(lsah); (sum < length) && (tlvh != NULL); + tlvh = TLV_HDR_NEXT(tlvh)) { + if (ntohs(tlvh->type) == EXT_TLV_LINK) { + /* Got Extended Link information */ + srl = get_ext_link_sid(tlvh); + /* Update SID if not null */ + if (srl != NULL) { + srl->instance = ntohl(lsah->id.s_addr); + update_ext_link_sid(srn, srl, lsa->flags); + } + } + sum += TLV_SIZE(tlvh); + } +} + +/* Delete Segment Routing from Extended Link LSA */ +void ospf_sr_ext_link_lsa_delete(struct ospf_lsa *lsa) +{ + struct listnode *node; + struct sr_link *srl; + struct sr_node *srn; + struct lsa_header *lsah = (struct lsa_header *)lsa->data; + uint32_t instance = ntohl(lsah->id.s_addr); + + if (IS_DEBUG_OSPF_SR) + zlog_debug( + "SR (%s): Remove Extended Link LSA 8.0.0.%u from %s", + __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)), + inet_ntoa(lsah->adv_router)); + + /* Sanity check */ + if (OspfSR.neighbors == NULL) { + zlog_err("SR (%s): Abort! no valid SR DataBase", __func__); + return; + } + + /* Search SR Node in hash table from Router ID */ + srn = (struct sr_node *)hash_lookup(OspfSR.neighbors, + (void *)&(lsah->adv_router)); + + /* + * SR-Node may be NULL if it has been remove previously when + * processing Router Information LSA deletion + */ + if (srn == NULL) { + zlog_warn( + "SR (%s): Stop! no entry in SRDB for SR Node %s", + __func__, inet_ntoa(lsah->adv_router)); + return; + } + + /* Search for corresponding Segment Link */ + for (ALL_LIST_ELEMENTS_RO(srn->ext_link, node, srl)) + if (srl->instance == instance) + break; + + /* Remove Segment Link if found */ + if ((srl != NULL) && (srl->instance == instance)) { + del_sid_nhlfe(srl->nhlfe[0]); + del_sid_nhlfe(srl->nhlfe[1]); + listnode_delete(srn->ext_link, srl); + XFREE(MTYPE_OSPF_SR_PARAMS, srl); + } else { + zlog_warn( + "SR (%s): Didn't found corresponding SR Link 8.0.0.%u " + "for SR Node %s", __func__, + GET_OPAQUE_ID(ntohl(lsah->id.s_addr)), + inet_ntoa(lsah->adv_router)); + } + +} + +/* Update Segment Routing from Extended Prefix LSA */ +void ospf_sr_ext_prefix_lsa_update(struct ospf_lsa *lsa) +{ + struct sr_node *srn; + struct tlv_header *tlvh; + struct lsa_header *lsah = (struct lsa_header *)lsa->data; + struct sr_prefix *srp; + + uint16_t length, sum; + + if (IS_DEBUG_OSPF_SR) + zlog_debug( + "SR (%s): Process Extended Prefix LSA " + "7.0.0.%u from %s", __func__, + GET_OPAQUE_ID(ntohl(lsah->id.s_addr)), + inet_ntoa(lsah->adv_router)); + + /* Sanity check */ + if (OspfSR.neighbors == NULL) { + zlog_err("SR (%s): Abort! no valid SR DataBase", __func__); + return; + } + + /* Get SR Node in hash table from Router ID */ + srn = (struct sr_node *)hash_get(OspfSR.neighbors, + (void *)&(lsah->adv_router), + (void *)sr_node_new); + + /* Sanity check */ + if (srn == NULL) { + zlog_err( + "SR (%s): Abort! can't create SR node in hash table", + __func__); + return; + } + + /* Initialize TLV browsing */ + length = ntohs(lsah->length) - OSPF_LSA_HEADER_SIZE; + sum = 0; + for (tlvh = TLV_HDR_TOP(lsah); sum < length; + tlvh = TLV_HDR_NEXT(tlvh)) { + if (ntohs(tlvh->type) == EXT_TLV_LINK) { + /* Got Extended Link information */ + srp = get_ext_prefix_sid(tlvh); + /* Update SID if not null */ + if (srp != NULL) { + srp->instance = ntohl(lsah->id.s_addr); + update_ext_prefix_sid(srn, srp); + } + } + sum += TLV_SIZE(tlvh); + } +} + +/* Delete Segment Routing from Extended Prefix LSA */ +void ospf_sr_ext_prefix_lsa_delete(struct ospf_lsa *lsa) +{ + struct listnode *node; + struct sr_prefix *srp; + struct sr_node *srn; + struct lsa_header *lsah = (struct lsa_header *)lsa->data; + uint32_t instance = ntohl(lsah->id.s_addr); + + if (IS_DEBUG_OSPF_SR) + zlog_debug( + "SR (%s): Remove Extended Prefix LSA 7.0.0.%u from %s", + __func__, GET_OPAQUE_ID(ntohl(lsah->id.s_addr)), + inet_ntoa(lsah->adv_router)); + + /* Sanity check */ + if (OspfSR.neighbors == NULL) { + zlog_err("SR (%s): Abort! no valid SR DataBase", __func__); + return; + } + + /* Search SR Node in hash table from Router ID */ + srn = (struct sr_node *)hash_lookup(OspfSR.neighbors, + (void *)&(lsah->adv_router)); + + /* + * SR-Node may be NULL if it has been remove previously when + * processing Router Information LSA deletion + */ + if (srn == NULL) { + zlog_warn( + "SR (%s): Stop! no entry in SRDB for SR Node %s", + __func__, inet_ntoa(lsah->adv_router)); + return; + } + + /* Search for corresponding Segment Link */ + for (ALL_LIST_ELEMENTS_RO(srn->ext_prefix, node, srp)) + if (srp->instance == instance) + break; + + /* Remove Segment Link if found */ + if ((srp != NULL) && (srp->instance == instance)) { + del_sid_nhlfe(srp->nhlfe); + listnode_delete(srn->ext_link, srp); + XFREE(MTYPE_OSPF_SR_PARAMS, srp); + } else { + zlog_warn( + "SR (%s): Didn't found corresponding SR Prefix " + "7.0.0.%u for SR Node %s", __func__, + GET_OPAQUE_ID(ntohl(lsah->id.s_addr)), + inet_ntoa(lsah->adv_router)); + } + +} + +/* Get Label for Extended Link SID */ +/* TODO: To be replace by Zebra Label Manager */ +uint32_t get_ext_link_label_value(void) +{ + static uint32_t label = ADJ_SID_MIN - 1; + + if (label < ADJ_SID_MAX) + label += 1; + + return label; +} + +/* + * Update Prefix SID. Call by ospf_ext_pref_ism_change to + * complete initial CLI command at startutp. + * + * @param ifp - Loopback interface + * @param pref - Prefix address of this interface + * + * @return - void + */ +void ospf_sr_update_prefix(struct interface *ifp, struct prefix *p) +{ + struct listnode *node; + struct sr_prefix *srp; + + /* Sanity Check */ + if ((ifp == NULL) || (p == NULL)) + return; + + /* + * Search if there is a Segment Prefix that correspond to this + * interface or prefix, and update it if found + */ + for (ALL_LIST_ELEMENTS_RO(OspfSR.self->ext_prefix, node, srp)) { + if ((srp->nhlfe.ifindex == ifp->ifindex) + || ((IPV4_ADDR_SAME(&srp->nhlfe.prefv4.prefix, + &p->u.prefix4)) + && (srp->nhlfe.prefv4.prefixlen == p->prefixlen))) { + + /* Update Interface & Prefix info */ + srp->nhlfe.ifindex = ifp->ifindex; + IPV4_ADDR_COPY(&srp->nhlfe.prefv4.prefix, + &p->u.prefix4); + srp->nhlfe.prefv4.prefixlen = p->prefixlen; + srp->nhlfe.prefv4.family = p->family; + IPV4_ADDR_COPY(&srp->nhlfe.nexthop, &p->u.prefix4); + + /* OK. Let's Schedule Extended Prefix LSA */ + srp->instance = ospf_ext_schedule_prefix_index(ifp, + srp->sid, &srp->nhlfe.prefv4, srp->flags); + + /* Install NHLFE if NO-PHP is requested */ + if (CHECK_FLAG(srp->flags, + EXT_SUBTLV_PREFIX_SID_NPFLG)) { + srp->nhlfe.label_in = index2label(srp->sid, + OspfSR.self->srgb); + srp->nhlfe.label_out = MPLS_IMP_NULL_LABEL; + add_sid_nhlfe(srp->nhlfe); + } + } + } +} + +/* + * Following functions are used to update MPLS LFIB after a SPF run + */ + +static void ospf_sr_nhlfe_update(struct hash_backet *backet, void *args) +{ + + struct sr_node *srn = (struct sr_node *)backet->data; + struct listnode *node; + struct sr_prefix *srp; + struct sr_nhlfe old; + int rc; + + /* Sanity Check */ + if (srn == NULL) + return; + + if (IS_DEBUG_OSPF_SR) + zlog_debug(" |- Update Prefix for SR Node %s", + inet_ntoa(srn->adv_router)); + + /* Skip Self SR Node */ + if (srn == OspfSR.self) + return; + + /* Update Extended Prefix */ + for (ALL_LIST_ELEMENTS_RO(srn->ext_prefix, node, srp)) { + + /* Backup current NHLFE */ + memcpy(&old, &srp->nhlfe, sizeof(struct sr_nhlfe)); + + /* Compute the new NHLFE */ + rc = compute_prefix_nhlfe(srp); + + /* Check computation result */ + switch (rc) { + /* next hop is not know, remove old NHLFE to avoid loop */ + case -1: + del_sid_nhlfe(srp->nhlfe); + break; + /* next hop has not changed, skip it */ + case 0: + break; + /* there is a new next hop, update NHLFE */ + case 1: + update_sid_nhlfe(old, srp->nhlfe); + break; + default: + break; + } + } +} + +static int ospf_sr_update_schedule(struct thread *t) +{ + + struct ospf *ospf; + struct timeval start_time, stop_time; + + ospf = THREAD_ARG(t); + ospf->t_sr_update = NULL; + + if (!OspfSR.update) + return 0; + + monotime(&start_time); + + if (IS_DEBUG_OSPF_SR) + zlog_debug("SR (%s): Start SPF update", __func__); + + hash_iterate(OspfSR.neighbors, (void (*)(struct hash_backet *, + void *))ospf_sr_nhlfe_update, + NULL); + + monotime(&stop_time); + + zlog_info( + "SR (%s): SPF Processing Time(usecs): %lld\n", + __func__, + (stop_time.tv_sec - start_time.tv_sec) * 1000000LL + + (stop_time.tv_usec - start_time.tv_usec)); + + OspfSR.update = false; + return 1; +} + +#define OSPF_SR_UPDATE_INTERVAL 1 + +void ospf_sr_update_timer_add(struct ospf *ospf) +{ + + if (ospf == NULL) + return; + + /* Check if an update is not alreday engage */ + if (OspfSR.update) + return; + + OspfSR.update = true; + + thread_add_timer(master, ospf_sr_update_schedule, ospf, + OSPF_SR_UPDATE_INTERVAL, &ospf->t_sr_update); +} + +/* + * -------------------------------------- + * Followings are vty command functions. + * -------------------------------------- + */ + +/* + * Segment Routing Router configuration + * + * Must be centralize as it concerns both Extended Link/Prefix LSA + * and Router Information LSA. Choose to call it from Extended Prefix + * write_config() call back. + * + * @param vty VTY output + * + * @return none + */ +void ospf_sr_config_write_router(struct vty *vty) +{ + struct listnode *node; + struct sr_prefix *srp; + + if (OspfSR.enabled) { + vty_out(vty, " segment-routing on\n"); + + if ((OspfSR.srgb.lower_bound != MPLS_DEFAULT_MIN_SRGB_LABEL) + || (OspfSR.srgb.range_size != MPLS_DEFAULT_MAX_SRGB_SIZE)) { + vty_out(vty, " segment-routing global-block %u %u\n", + OspfSR.srgb.lower_bound, + OspfSR.srgb.lower_bound + + OspfSR.srgb.range_size - 1); + } + if (OspfSR.msd != 0) + vty_out(vty, " segment-routing node-msd %u\n", + OspfSR.msd); + + if (OspfSR.self != NULL) { + for (ALL_LIST_ELEMENTS_RO(OspfSR.self->ext_prefix, node, + srp)) { + vty_out(vty, + " segment-routing prefix %s/%u " + "index %u%s\n", + inet_ntoa(srp->nhlfe.prefv4.prefix), + srp->nhlfe.prefv4.prefixlen, srp->sid, + CHECK_FLAG(srp->flags, + EXT_SUBTLV_PREFIX_SID_NPFLG) ? + " no-php-flag" : ""); + } + } + } +} + +DEFUN(ospf_sr_enable, + ospf_sr_enable_cmd, + "segment-routing on", + SR_STR + "Enable Segment Routing\n") +{ + + VTY_DECLVAR_INSTANCE_CONTEXT(ospf, ospf); + + if (OspfSR.enabled) + return CMD_SUCCESS; + + if (ospf->vrf_id != VRF_DEFAULT) { + vty_out(vty, "Segment Routing is only supported in default " + "VRF\n"); + return CMD_WARNING_CONFIG_FAILED; + } + + if (IS_DEBUG_OSPF_EVENT) + zlog_debug("SR: Segment Routing: OFF -> ON"); + + /* Start Segment Routing */ + OspfSR.enabled = true; + if (!ospf_sr_start(ospf)) { + zlog_warn("SR: Unable to start Segment Routing. Abort!"); + return CMD_WARNING; + } + + /* Set Router Information SR parameters */ + if (IS_DEBUG_OSPF_EVENT) + zlog_debug("SR: Activate SR for Router Information LSA"); + + ospf_router_info_update_sr(true, OspfSR.srgb, OspfSR.msd); + + /* Update Ext LSA */ + if (IS_DEBUG_OSPF_EVENT) + zlog_debug("SR: Activate SR for Extended Link/Prefix LSA"); + + ospf_ext_update_sr(true); + + return CMD_SUCCESS; +} + +DEFUN (no_ospf_sr_enable, + no_ospf_sr_enable_cmd, + "no segment-routing [on]", + NO_STR + SR_STR + "Disable Segment Routing\n") +{ + + if (!OspfSR.enabled) + return CMD_SUCCESS; + + if (IS_DEBUG_OSPF_EVENT) + zlog_debug("SR: Segment Routing: ON -> OFF"); + + /* Start by Disabling Extended Link & Prefix LSA */ + ospf_ext_update_sr(false); + + /* then, disable Router Information SR parameters */ + ospf_router_info_update_sr(false, OspfSR.srgb, OspfSR.msd); + + /* Finally, stop Segment Routing */ + ospf_sr_stop(); + OspfSR.enabled = false; + + return CMD_SUCCESS; +} + +static int ospf_sr_enabled(struct vty *vty) +{ + if (OspfSR.enabled) + return 1; + + if (vty) + vty_out(vty, "%% OSPF SR is not turned on\n"); + + return 0; +} + +DEFUN (sr_sid_label_range, + sr_sid_label_range_cmd, + "segment-routing global-block (0-1048575) (0-1048575)", + SR_STR + "Segment Routing Global Block label range\n" + "Lower-bound range in decimal (0-1048575)\n" + "Upper-bound range in decimal (0-1048575)\n") +{ + uint32_t upper; + uint32_t lower; + uint32_t size; + int idx_low = 2; + int idx_up = 3; + + if (!ospf_sr_enabled(vty)) + return CMD_WARNING_CONFIG_FAILED; + + /* Get lower and upper bound */ + lower = strtoul(argv[idx_low]->arg, NULL, 10); + upper = strtoul(argv[idx_up]->arg, NULL, 10); + size = upper - lower + 1; + + if (size > MPLS_DEFAULT_MAX_SRGB_SIZE || size <= 0) { + vty_out(vty, + "Range size cannot be less than 0 or more than %u\n", + MPLS_DEFAULT_MAX_SRGB_SIZE); + return CMD_WARNING_CONFIG_FAILED; + } + + if (upper > MPLS_DEFAULT_MAX_SRGB_LABEL) { + vty_out(vty, "Upper-bound cannot exceed %u\n", + MPLS_DEFAULT_MAX_SRGB_LABEL); + return CMD_WARNING_CONFIG_FAILED; + } + + if (upper < MPLS_DEFAULT_MIN_SRGB_LABEL) { + vty_out(vty, "Upper-bound cannot be lower than %u\n", + MPLS_DEFAULT_MIN_SRGB_LABEL); + return CMD_WARNING_CONFIG_FAILED; + } + + /* Check if values have changed */ + if ((OspfSR.srgb.range_size == size) + && (OspfSR.srgb.lower_bound == lower)) + return CMD_SUCCESS; + + /* Set SID/Label range SRGB */ + OspfSR.srgb.range_size = size; + OspfSR.srgb.lower_bound = lower; + if (OspfSR.self != NULL) { + OspfSR.self->srgb.range_size = size; + OspfSR.self->srgb.lower_bound = lower; + } + + /* Set Router Information SR parameters */ + ospf_router_info_update_sr(true, OspfSR.srgb, OspfSR.msd); + + /* Update NHLFE entries */ + hash_iterate(OspfSR.neighbors, + (void (*)(struct hash_backet *, void *))update_in_nhlfe, + NULL); + + return CMD_SUCCESS; +} + +DEFUN (no_sr_sid_label_range, + no_sr_sid_label_range_cmd, + "no segment-routing global-block [(0-1048575) (0-1048575)]", + NO_STR + SR_STR + "Segment Routing Global Block label range\n" + "Lower-bound range in decimal (0-1048575)\n" + "Upper-bound range in decimal (0-1048575)\n") +{ + + if (!ospf_sr_enabled(vty)) + return CMD_WARNING_CONFIG_FAILED; + + /* Revert to default SRGB value */ + OspfSR.srgb.range_size = MPLS_DEFAULT_MIN_SRGB_SIZE; + OspfSR.srgb.lower_bound = MPLS_DEFAULT_MIN_SRGB_LABEL; + if (OspfSR.self != NULL) { + OspfSR.self->srgb.range_size = OspfSR.srgb.range_size; + OspfSR.self->srgb.lower_bound = OspfSR.srgb.lower_bound; + } + + /* Set Router Information SR parameters */ + ospf_router_info_update_sr(true, OspfSR.srgb, OspfSR.msd); + + /* Update NHLFE entries */ + hash_iterate(OspfSR.neighbors, + (void (*)(struct hash_backet *, void *))update_in_nhlfe, + NULL); + + return CMD_SUCCESS; +} + +DEFUN (sr_node_msd, + sr_node_msd_cmd, + "segment-routing node-msd (1-16)", + SR_STR + "Maximum Stack Depth for this router\n" + "Maximum number of label that could be stack (1-16)\n") +{ + uint32_t msd; + int idx = 1; + + if (!ospf_sr_enabled(vty)) + return CMD_WARNING_CONFIG_FAILED; + + /* Get MSD */ + argv_find(argv, argc, "(1-16)", &idx); + msd = strtoul(argv[idx]->arg, NULL, 10); + if (msd < 1 || msd > MPLS_MAX_LABELS) { + vty_out(vty, "MSD must be comprise between 1 and %u\n", + MPLS_MAX_LABELS); + return CMD_WARNING_CONFIG_FAILED; + } + + /* Check if value has changed */ + if (OspfSR.msd == msd) + return CMD_SUCCESS; + + /* Set this router MSD */ + OspfSR.msd = msd; + if (OspfSR.self != NULL) + OspfSR.self->msd = msd; + + /* Set Router Information SR parameters */ + ospf_router_info_update_sr(true, OspfSR.srgb, OspfSR.msd); + + return CMD_SUCCESS; +} + +DEFUN (no_sr_node_msd, + no_sr_node_msd_cmd, + "no segment-routing node-msd [(1-16)]", + NO_STR + SR_STR + "Maximum Stack Depth for this router\n" + "Maximum number of label that could be stack (1-16)\n") +{ + + if (!ospf_sr_enabled(vty)) + return CMD_WARNING_CONFIG_FAILED; + + /* unset this router MSD */ + OspfSR.msd = 0; + if (OspfSR.self != NULL) + OspfSR.self->msd = 0; + + /* Set Router Information SR parameters */ + ospf_router_info_update_sr(true, OspfSR.srgb, 0); + + return CMD_SUCCESS; +} + +DEFUN (sr_prefix_sid, + sr_prefix_sid_cmd, + "segment-routing prefix A.B.C.D/M index (0-65535) [no-php-flag]", + SR_STR + "Prefix SID\n" + "IPv4 Prefix as A.B.C.D/M\n" + "SID index for this prefix in decimal (0-65535)\n" + "Index value inside SRGB (lower_bound < index < upper_bound)\n" + "Don't request Penultimate Hop Popping (PHP)\n") +{ + int idx = 0; + struct prefix p; + uint32_t index; + struct listnode *node; + struct sr_prefix *srp, *new; + struct interface *ifp; + + if (!ospf_sr_enabled(vty)) + return CMD_WARNING_CONFIG_FAILED; + + /* Get network prefix */ + argv_find(argv, argc, "A.B.C.D/M", &idx); + if (!str2prefix(argv[idx]->arg, &p)) { + vty_out(vty, "Invalid prefix format %s\n", + argv[idx]->arg); + return CMD_WARNING_CONFIG_FAILED; + } + + /* Get & verify index value */ + argv_find(argv, argc, "(0-65535)", &idx); + index = strtoul(argv[idx]->arg, NULL, 10); + if (index > OspfSR.srgb.range_size - 1) { + vty_out(vty, "Index %u must be lower than range size %u\n", + index, OspfSR.srgb.range_size); + return CMD_WARNING_CONFIG_FAILED; + } + + /* check that the index is not already used */ + for (ALL_LIST_ELEMENTS_RO(OspfSR.self->ext_prefix, node, srp)) { + if (srp->sid == index) { + vty_out(vty, "Index %u is already used\n", index); + return CMD_WARNING_CONFIG_FAILED; + } + } + + /* Create new Extended Prefix to SRDB if not found */ + new = XCALLOC(MTYPE_OSPF_SR_PARAMS, sizeof(struct sr_prefix)); + IPV4_ADDR_COPY(&new->nhlfe.prefv4.prefix, &p.u.prefix4); + IPV4_ADDR_COPY(&new->nhlfe.nexthop, &p.u.prefix4); + new->nhlfe.prefv4.prefixlen = p.prefixlen; + new->nhlfe.prefv4.family = p.family; + new->sid = index; + /* Set NO PHP flag if present and compute NHLFE */ + if (argv_find(argv, argc, "no-php-flag", &idx)) { + SET_FLAG(new->flags, EXT_SUBTLV_PREFIX_SID_NPFLG); + new->nhlfe.label_in = index2label(new->sid, OspfSR.self->srgb); + new->nhlfe.label_out = MPLS_IMP_NULL_LABEL; + } + + if (IS_DEBUG_OSPF_SR) + zlog_debug( + "SR (%s): Add new index %u to Prefix %s/%u", + __func__, index, inet_ntoa(new->nhlfe.prefv4.prefix), + new->nhlfe.prefv4.prefixlen); + + /* Get Interface and check if it is a Loopback */ + ifp = if_lookup_prefix(&p, VRF_DEFAULT); + if (ifp == NULL) { + /* + * Interface could be not yet available i.e. when this + * command is in the configuration file, OSPF is not yet + * ready. In this case, store the prefix SID for latter + * update of this Extended Prefix + */ + listnode_add(OspfSR.self->ext_prefix, new); + zlog_warn( + "Interface for prefix %s/%u not found. Deferred LSA " + "flooding", inet_ntoa(p.u.prefix4), p.prefixlen); + return CMD_SUCCESS; + } + + if (!if_is_loopback(ifp)) { + vty_out(vty, "interface %s is not a Loopback\n", ifp->name); + XFREE(MTYPE_OSPF_SR_PARAMS, new); + return CMD_WARNING_CONFIG_FAILED; + } + new->nhlfe.ifindex = ifp->ifindex; + + /* Search if this prefix already exist */ + for (ALL_LIST_ELEMENTS_RO(OspfSR.self->ext_prefix, node, srp)) { + if ((IPV4_ADDR_SAME(&srp->nhlfe.prefv4.prefix, &p.u.prefix4) + && srp->nhlfe.prefv4.prefixlen == p.prefixlen)) + break; + else + srp = NULL; + } + + /* Update or Add this new SR Prefix */ + if (srp) { + update_sid_nhlfe(srp->nhlfe, new->nhlfe); + listnode_delete(OspfSR.self->ext_prefix, srp); + listnode_add(OspfSR.self->ext_prefix, new); + } else { + listnode_add(OspfSR.self->ext_prefix, new); + add_sid_nhlfe(new->nhlfe); + } + + /* Finally, update Extended Prefix LSA */ + new->instance = ospf_ext_schedule_prefix_index(ifp, new->sid, + &new->nhlfe.prefv4, new->flags); + if (new->instance == 0) { + vty_out(vty, "Unable to set index %u for prefix %s/%u\n", index, + inet_ntoa(p.u.prefix4), p.prefixlen); + return CMD_WARNING; + } + + return CMD_SUCCESS; +} + +DEFUN (no_sr_prefix_sid, + no_sr_prefix_sid_cmd, + "no segment-routing prefix A.B.C.D/M [index (0-65535) no-php-flag]", + NO_STR + SR_STR + "Prefix SID\n" + "IPv4 Prefix as A.B.C.D/M\n" + "SID index for this prefix in decimal (0-65535)\n" + "Index value inside SRGB (lower_bound < index < upper_bound)\n" + "Don't request Penultimate Hop Popping (PHP)\n") +{ + int idx = 0; + struct prefix p; + struct listnode *node; + struct sr_prefix *srp; + struct interface *ifp; + bool found = false; + int rc; + + /* Get network prefix */ + argv_find(argv, argc, "A.B.C.D/M", &idx); + rc = str2prefix(argv[idx]->arg, &p); + if (!rc) { + vty_out(vty, "Invalid prefix format %s\n", + argv[idx]->arg); + return CMD_WARNING_CONFIG_FAILED; + } + + /* check that the prefix is already set */ + for (ALL_LIST_ELEMENTS_RO(OspfSR.self->ext_prefix, node, srp)) + if (IPV4_ADDR_SAME(&srp->nhlfe.prefv4.prefix, &p.u.prefix4) + && (srp->nhlfe.prefv4.prefixlen == p.prefixlen)) { + found = true; + break; + } + + if (!found) { + vty_out(vty, "Prefix %s is not found. Abort!\n", + argv[idx]->arg); + return CMD_WARNING_CONFIG_FAILED; + } + + /* Get Interface */ + ifp = if_lookup_by_index(srp->nhlfe.ifindex, VRF_DEFAULT); + if (ifp == NULL) { + vty_out(vty, "interface for prefix %s not found.\n", + argv[idx]->arg); + return CMD_WARNING_CONFIG_FAILED; + } + + /* Update Extended Prefix LSA */ + if (!ospf_ext_schedule_prefix_index(ifp, 0, NULL, 0)) { + vty_out(vty, "No corresponding loopback interface. Abort!\n"); + return CMD_WARNING; + } + + if (IS_DEBUG_OSPF_SR) + zlog_debug( + "SR (%s): Remove Prefix %s/%u with index %u", + __func__, inet_ntoa(srp->nhlfe.prefv4.prefix), + srp->nhlfe.prefv4.prefixlen, srp->sid); + + /* Delete NHLFE is NO-PHP is set */ + if (CHECK_FLAG(srp->flags, EXT_SUBTLV_PREFIX_SID_NPFLG)) + del_sid_nhlfe(srp->nhlfe); + + /* OK, all is clean, remove SRP from SRDB */ + listnode_delete(OspfSR.self->ext_prefix, srp); + XFREE(MTYPE_OSPF_SR_PARAMS, srp); + + return CMD_SUCCESS; +} + + + +static void show_vty_sr_node(struct vty *vty, struct sr_node *srn) +{ + + struct listnode *node; + struct sr_link *srl; + struct sr_prefix *srp; + struct interface *itf; + char pref[16]; + char sid[22]; + char label[8]; + + /* Sanity Check */ + if (srn == NULL) + return; + + vty_out(vty, "SR-Node: %s", inet_ntoa(srn->adv_router)); + vty_out(vty, "\tSRGB (Size/Label): %u/%u", srn->srgb.range_size, + srn->srgb.lower_bound); + vty_out(vty, "\tAlgorithm(s): %s", + srn->algo[0] == SR_ALGORITHM_SPF ? "SPF" : "S-SPF"); + for (int i = 1; i < ALGORITHM_COUNT; i++) { + if (srn->algo[i] == SR_ALGORITHM_UNSET) + continue; + vty_out(vty, "/%s", + srn->algo[i] == SR_ALGORITHM_SPF ? "SPF" : "S-SPF"); + } + if (srn->msd != 0) + vty_out(vty, "\tMSD: %u", srn->msd); + + vty_out(vty, + "\n\n Prefix or Link Label In Label Out " + "Node or Adj. SID Interface Nexthop\n"); + vty_out(vty, + "------------------ -------- --------- " + "--------------------- --------- ---------------\n"); + for (ALL_LIST_ELEMENTS_RO(srn->ext_prefix, node, srp)) { + strncpy(pref, inet_ntoa(srp->nhlfe.prefv4.prefix), 16); + snprintf(sid, 22, "SR Pfx (idx %u)", srp->sid); + if (srp->nhlfe.label_out == MPLS_IMP_NULL_LABEL) + sprintf(label, "pop"); + else + sprintf(label, "%u", srp->nhlfe.label_out); + itf = if_lookup_by_index(srp->nhlfe.ifindex, VRF_DEFAULT); + vty_out(vty, "%15s/%u %8u %9s %21s %9s %15s\n", pref, + srp->nhlfe.prefv4.prefixlen, srp->nhlfe.label_in, label, + sid, itf ? itf->name : "-", + inet_ntoa(srp->nhlfe.nexthop)); + } + + for (ALL_LIST_ELEMENTS_RO(srn->ext_link, node, srl)) { + strncpy(pref, inet_ntoa(srl->nhlfe[0].prefv4.prefix), 16); + snprintf(sid, 22, "SR Adj. (lbl %u)", srl->sid[0]); + if (srl->nhlfe[0].label_out == MPLS_IMP_NULL_LABEL) + sprintf(label, "pop"); + else + sprintf(label, "%u", srl->nhlfe[0].label_out); + itf = if_lookup_by_index(srl->nhlfe[0].ifindex, VRF_DEFAULT); + vty_out(vty, "%15s/%u %8u %9s %21s %9s %15s\n", pref, + srl->nhlfe[0].prefv4.prefixlen, srl->nhlfe[0].label_in, + label, sid, itf ? itf->name : "-", + inet_ntoa(srl->nhlfe[0].nexthop)); + snprintf(sid, 22, "SR Adj. (lbl %u)", srl->sid[1]); + if (srl->nhlfe[1].label_out == MPLS_IMP_NULL_LABEL) + sprintf(label, "pop"); + else + sprintf(label, "%u", srl->nhlfe[0].label_out); + vty_out(vty, "%15s/%u %8u %9s %21s %9s %15s\n", pref, + srl->nhlfe[1].prefv4.prefixlen, srl->nhlfe[1].label_in, + label, sid, itf ? itf->name : "-", + inet_ntoa(srl->nhlfe[1].nexthop)); + } + vty_out(vty, "\n"); +} + +static void show_srdb_entry(struct hash_backet *backet, void *args) +{ + struct vty *vty = (struct vty *)args; + struct sr_node *srn = (struct sr_node *)backet->data; + + show_vty_sr_node(vty, srn); +} + +DEFUN (show_ip_opsf_srdb, + show_ip_ospf_srdb_cmd, + "show ip ospf database segment-routing [adv-router A.B.C.D|self-originate]", + SHOW_STR + IP_STR + OSPF_STR + "Database summary\n" + "Show Segment Routing Data Base\n" + "Advertising SR node\n" + "Advertising SR node ID (as an IP address)\n" + "Self-originated SR node\n") +{ + int idx = 0; + struct in_addr rid; + struct sr_node *srn; + + if (!OspfSR.enabled) { + vty_out(vty, "Segment Routing is disabled on this router\n"); + return CMD_WARNING; + } + + vty_out(vty, "\n OSPF Segment Routing database for ID %s\n\n", + inet_ntoa(OspfSR.self->adv_router)); + + if (argv_find(argv, argc, "self-originate", &idx)) { + srn = OspfSR.self; + show_vty_sr_node(vty, srn); + return CMD_SUCCESS; + } + + if (argv_find(argv, argc, "A.B.C.D", &idx)) { + if (!inet_aton(argv[idx]->arg, &rid)) { + vty_out(vty, + "Specified Router ID %s is invalid\n", + argv[idx]->arg); + return CMD_WARNING_CONFIG_FAILED; + } + /* Get the SR Node from the SRDB */ + srn = (struct sr_node *)hash_lookup(OspfSR.neighbors, + (void *)&rid); + show_vty_sr_node(vty, srn); + return CMD_SUCCESS; + } + + /* No parameters have been provided, Iterate through all the SRDB */ + hash_iterate( + OspfSR.neighbors, + (void (*)(struct hash_backet *, void *))show_srdb_entry, + (void *)vty); + return CMD_SUCCESS; +} + +/* Install new CLI commands */ +void ospf_sr_register_vty(void) +{ + install_element(VIEW_NODE, &show_ip_ospf_srdb_cmd); + + install_element(OSPF_NODE, &ospf_sr_enable_cmd); + install_element(OSPF_NODE, &no_ospf_sr_enable_cmd); + install_element(OSPF_NODE, &sr_sid_label_range_cmd); + install_element(OSPF_NODE, &no_sr_sid_label_range_cmd); + install_element(OSPF_NODE, &sr_node_msd_cmd); + install_element(OSPF_NODE, &no_sr_node_msd_cmd); + install_element(OSPF_NODE, &sr_prefix_sid_cmd); + install_element(OSPF_NODE, &no_sr_prefix_sid_cmd); + +} |