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ospf_sr.c
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/*
* 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 <lib/json.h>
#include "ospf_errors.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));
/* 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;
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;
if (IS_DEBUG_OSPF_SR)
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)
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;
/* Update neighbor address for LAN_ADJ_SID */
if (srl->type == LAN_ADJ_SID) {
IPV4_ADDR_COPY(&srl->nhlfe[0].nexthop, &nh->src);
IPV4_ADDR_COPY(&srl->nhlfe[1].nexthop, &nh->src);
}
/* 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_LABEL_IMPLICIT_NULL;
srl->nhlfe[1].label_out = MPLS_LABEL_IMPLICIT_NULL;
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_LABEL_IMPLICIT_NULL;
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_nh->vrf_id = VRF_DEFAULT;
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_LABEL_IMPLICIT_NULL)
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_LABEL_IMPLICIT_NULL)
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));
/* 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));
/* 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_ferr(OSPF_ERR_SR_INVALID_ALGORITHM,
"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,
uint8_t 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;