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ospf_ext.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* This is an implementation of RFC7684 OSPFv2 Prefix/Link Attribute
* Advertisement
*
* Module name: Extended Prefix/Link Opaque LSA
*
* Author: Olivier Dugeon <olivier.dugeon@orange.com>
* Author: Anselme Sawadogo <anselmesawadogo@gmail.com>
*
* Copyright (C) 2016 - 2018 Orange Labs http://www.orange.com
*/
#include <zebra.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include "linklist.h"
#include "prefix.h"
#include "if.h"
#include "table.h"
#include "memory.h"
#include "command.h"
#include "vty.h"
#include "stream.h"
#include "log.h"
#include "frrevent.h"
#include "hash.h"
#include "sockunion.h" /* for inet_aton() */
#include "network.h"
#include "if.h"
#include "libospf.h" /* for ospf interface types */
#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_zebra.h"
#include "ospfd/ospf_sr.h"
#include "ospfd/ospf_ext.h"
#include "ospfd/ospf_errors.h"
/* Following structure are internal use only. */
/*
* Global variable to manage Extended Prefix/Link Opaque LSA on this node.
* Note that all parameter values are stored in network byte order.
*/
static struct ospf_ext_lp OspfEXT;
/*
* -----------------------------------------------------------------------
* Following are initialize/terminate functions for Extended Prefix/Link
* Opaque LSA handling.
* -----------------------------------------------------------------------
*/
/* Extended Prefix Opaque LSA related callback functions */
static void ospf_ext_pref_show_info(struct vty *vty, struct json_object *json,
struct ospf_lsa *lsa);
static int ospf_ext_pref_lsa_originate(void *arg);
static struct ospf_lsa *ospf_ext_pref_lsa_refresh(struct ospf_lsa *lsa);
static void ospf_ext_pref_lsa_schedule(struct ext_itf *exti,
enum lsa_opcode opcode);
/* Extended Link Opaque LSA related callback functions */
static int ospf_ext_link_new_if(struct interface *ifp);
static int ospf_ext_link_del_if(struct interface *ifp);
static void ospf_ext_ism_change(struct ospf_interface *oi, int old_status);
static void ospf_ext_link_nsm_change(struct ospf_neighbor *nbr, int old_status);
static void ospf_ext_link_show_info(struct vty *vty, struct json_object *json,
struct ospf_lsa *lsa);
static int ospf_ext_link_lsa_originate(void *arg);
static struct ospf_lsa *ospf_ext_link_lsa_refresh(struct ospf_lsa *lsa);
static void ospf_ext_link_lsa_schedule(struct ext_itf *exti,
enum lsa_opcode opcode);
static void ospf_ext_lsa_schedule(struct ext_itf *exti, enum lsa_opcode op);
static int ospf_ext_link_lsa_update(struct ospf_lsa *lsa);
static int ospf_ext_pref_lsa_update(struct ospf_lsa *lsa);
static void ospf_ext_link_delete_adj_sid(struct ext_itf *exti);
static void del_ext_info(void *val);
/*
* Extended Link/Prefix initialization
*
* @param - none
*
* @return - 0 if OK, <> 0 otherwise
*/
int ospf_ext_init(void)
{
int rc = 0;
memset(&OspfEXT, 0, sizeof(OspfEXT));
OspfEXT.enabled = false;
/* Only Area flooding is supported yet */
OspfEXT.scope = OSPF_OPAQUE_AREA_LSA;
/* Initialize interface list */
OspfEXT.iflist = list_new();
OspfEXT.iflist->del = del_ext_info;
zlog_info("EXT (%s): Register Extended Link Opaque LSA", __func__);
rc = ospf_register_opaque_functab(
OSPF_OPAQUE_AREA_LSA, OPAQUE_TYPE_EXTENDED_LINK_LSA,
ospf_ext_link_new_if, /* new if */
ospf_ext_link_del_if, /* del if */
ospf_ext_ism_change, /* ism change */
ospf_ext_link_nsm_change, /* nsm change */
NULL, /* Write router config. */
NULL, /* Write interface conf. */
NULL, /* Write debug config. */
ospf_ext_link_show_info, /* Show LSA info */
ospf_ext_link_lsa_originate, /* Originate LSA */
ospf_ext_link_lsa_refresh, /* Refresh LSA */
ospf_ext_link_lsa_update, /* new_lsa_hook */
NULL); /* del_lsa_hook */
if (rc != 0) {
flog_warn(EC_OSPF_OPAQUE_REGISTRATION,
"EXT (%s): Failed to register Extended Link LSA",
__func__);
return rc;
}
zlog_info("EXT (%s): Register Extended Prefix Opaque LSA", __func__);
rc = ospf_register_opaque_functab(
OspfEXT.scope, OPAQUE_TYPE_EXTENDED_PREFIX_LSA,
NULL, /* new if handle by link */
NULL, /* del if handle by link */
NULL, /* ism change */
NULL, /* nsm change */
ospf_sr_config_write_router, /* Write router config. */
NULL, /* Write interface conf. */
NULL, /* Write debug config. */
ospf_ext_pref_show_info, /* Show LSA info */
ospf_ext_pref_lsa_originate, /* Originate LSA */
ospf_ext_pref_lsa_refresh, /* Refresh LSA */
ospf_ext_pref_lsa_update, /* new_lsa_hook */
NULL); /* del_lsa_hook */
if (rc != 0) {
flog_warn(EC_OSPF_OPAQUE_REGISTRATION,
"EXT (%s): Failed to register Extended Prefix LSA",
__func__);
return rc;
}
return rc;
}
/*
* Extended Link/Prefix termination function
*
* @param - none
* @return - none
*/
void ospf_ext_term(void)
{
if ((OspfEXT.scope == OSPF_OPAQUE_AREA_LSA)
|| (OspfEXT.scope == OSPF_OPAQUE_AS_LSA))
ospf_delete_opaque_functab(OspfEXT.scope,
OPAQUE_TYPE_EXTENDED_PREFIX_LSA);
ospf_delete_opaque_functab(OSPF_OPAQUE_AREA_LSA,
OPAQUE_TYPE_EXTENDED_LINK_LSA);
list_delete(&OspfEXT.iflist);
OspfEXT.scope = 0;
OspfEXT.enabled = false;
return;
}
/*
* Extended Link/Prefix finish function
*
* @param - none
* @return - none
*/
void ospf_ext_finish(void)
{
struct listnode *node;
struct ext_itf *exti;
/* Flush Router Info LSA */
for (ALL_LIST_ELEMENTS_RO(OspfEXT.iflist, node, exti))
if (CHECK_FLAG(exti->flags, EXT_LPFLG_LSA_ENGAGED))
ospf_ext_lsa_schedule(exti, FLUSH_THIS_LSA);
OspfEXT.enabled = false;
}
/*
* ---------------------------------------------------------------------
* Following are control functions for Extended Prefix/Link Opaque LSA
* parameters management.
* ---------------------------------------------------------------------
*/
/* Functions to free memory space */
static void del_ext_info(void *val)
{
XFREE(MTYPE_OSPF_EXT_PARAMS, val);
}
/* Increment instance value for Extended Prefix Opaque LSAs Opaque ID field */
static uint32_t get_ext_pref_instance_value(void)
{
static uint32_t seqno = 0;
if (seqno < MAX_LEGAL_EXT_INSTANCE_NUM)
seqno += 1;
else
seqno = 1; /* Avoid zero. */
return seqno;
}
/* Increment instance value for Extended Link Opaque LSAs Opaque ID field */
static uint32_t get_ext_link_instance_value(void)
{
static uint32_t seqno = 0;
if (seqno < MAX_LEGAL_EXT_INSTANCE_NUM)
seqno += 1;
else
seqno = 1; /* Avoid zero. */
return seqno;
}
/* Lookup Extended Prefix/Links by ifp from OspfEXT struct iflist */
static struct ext_itf *lookup_ext_by_ifp(struct interface *ifp)
{
struct listnode *node;
struct ext_itf *exti;
for (ALL_LIST_ELEMENTS_RO(OspfEXT.iflist, node, exti))
if (exti->ifp == ifp)
return exti;
return NULL;
}
/* Lookup Extended Prefix/Links by LSA ID from OspfEXT struct iflist */
static struct ext_itf *lookup_ext_by_instance(struct ospf_lsa *lsa)
{
struct listnode *node;
struct ext_itf *exti;
uint32_t key = GET_OPAQUE_ID(ntohl(lsa->data->id.s_addr));
uint8_t type = GET_OPAQUE_TYPE(ntohl(lsa->data->id.s_addr));
for (ALL_LIST_ELEMENTS_RO(OspfEXT.iflist, node, exti))
if ((exti->instance == key) && (exti->type == type))
return exti;
return NULL;
}
/*
* ----------------------------------------------------------------------
* The underlying subsection defines setters and unsetters to create and
* delete tlvs and subtlvs
* ----------------------------------------------------------------------
*/
/* Extended Prefix TLV - RFC7684 section 2.1 */
static void set_ext_prefix(struct ext_itf *exti, uint8_t route_type,
uint8_t flags, struct prefix_ipv4 p)
{
TLV_TYPE(exti->prefix) = htons(EXT_TLV_PREFIX);
/* Warning: Size must be adjust depending of subTLV's */
TLV_LEN(exti->prefix) = htons(EXT_TLV_PREFIX_SIZE);
exti->prefix.route_type = route_type;
exti->prefix.flags = flags;
/* Only Address Family Ipv4 (0) is defined in RFC 7684 */
exti->prefix.af = 0;
exti->prefix.pref_length = p.prefixlen;
exti->prefix.address = p.prefix;
SET_FLAG(exti->flags, EXT_LPFLG_LSA_ACTIVE);
}
/* Extended Link TLV - RFC7684 section 3.1 */
static void set_ext_link(struct ext_itf *exti, uint8_t type, struct in_addr id,
struct in_addr data)
{
TLV_TYPE(exti->link) = htons(EXT_TLV_LINK);
/* Warning: Size must be adjust depending of subTLV's */
TLV_LEN(exti->link) = htons(EXT_TLV_LINK_SIZE);
exti->link.link_type = type;
exti->link.link_id = id;
exti->link.link_data = data;
}
/* Prefix SID SubTLV - section 5 */
static void set_prefix_sid(struct ext_itf *exti, uint8_t algorithm,
uint32_t value, int value_type, uint8_t flags)
{
if ((algorithm != SR_ALGORITHM_SPF)
&& (algorithm != SR_ALGORITHM_STRICT_SPF)) {
flog_err(EC_OSPF_INVALID_ALGORITHM,
"EXT (%s): unrecognized algorithm, not SPF or S-SPF",
__func__);
return;
}
/* Update flags according to the type of value field: label or index */
if (value_type == SID_LABEL)
SET_FLAG(flags, EXT_SUBTLV_PREFIX_SID_VFLG);
/* set prefix sid subtlv for an extended prefix tlv */
TLV_TYPE(exti->node_sid) = htons(EXT_SUBTLV_PREFIX_SID);
exti->node_sid.algorithm = algorithm;
exti->node_sid.flags = flags;
exti->node_sid.mtid = 0; /* Multi-Topology is not supported */
/* Set Label or Index value */
if (value_type == SID_LABEL) {
TLV_LEN(exti->node_sid) =
htons(SID_LABEL_SIZE(EXT_SUBTLV_PREFIX_SID_SIZE));
exti->node_sid.value = htonl(SET_LABEL(value));
} else {
TLV_LEN(exti->node_sid) =
htons(SID_INDEX_SIZE(EXT_SUBTLV_PREFIX_SID_SIZE));
exti->node_sid.value = htonl(value);
}
}
/* Adjacency SID SubTLV - section 6.1 */
static void set_adj_sid(struct ext_itf *exti, bool backup, uint32_t value,
int value_type)
{
int index;
uint8_t flags;
/* Determine which ADJ_SID must be set: nominal or backup */
if (backup) {
flags = EXT_SUBTLV_LINK_ADJ_SID_BFLG;
index = 1;
} else {
index = 0;
flags = 0;
}
/* Set Header */
TLV_TYPE(exti->adj_sid[index]) = htons(EXT_SUBTLV_ADJ_SID);
/* Only Local ADJ-SID is supported for the moment */
SET_FLAG(flags, EXT_SUBTLV_LINK_ADJ_SID_LFLG);
exti->adj_sid[index].mtid = 0; /* Multi-Topology is not supported */
/* Adjust Length, Flags and Value depending on the type of Label */
if (value_type == SID_LABEL) {
SET_FLAG(flags, EXT_SUBTLV_LINK_ADJ_SID_VFLG);
TLV_LEN(exti->adj_sid[index]) =
htons(SID_LABEL_SIZE(EXT_SUBTLV_ADJ_SID_SIZE));
exti->adj_sid[index].value = htonl(SET_LABEL(value));
} else {
UNSET_FLAG(flags, EXT_SUBTLV_LINK_ADJ_SID_VFLG);
TLV_LEN(exti->adj_sid[index]) =
htons(SID_INDEX_SIZE(EXT_SUBTLV_ADJ_SID_SIZE));
exti->adj_sid[index].value = htonl(value);
}
exti->adj_sid[index].flags = flags; /* Set computed flags */
exti->adj_sid[index].mtid = 0; /* Multi-Topology is not supported */
exti->adj_sid[index].weight = 0; /* Load-Balancing is not supported */
}
/* LAN Adjacency SID SubTLV - section 6.2 */
static void set_lan_adj_sid(struct ext_itf *exti, bool backup, uint32_t value,
int value_type, struct in_addr neighbor_id)
{
int index;
uint8_t flags;
/* Determine which ADJ_SID must be set: nominal or backup */
if (backup) {
flags = EXT_SUBTLV_LINK_ADJ_SID_BFLG;
index = 1;
} else {
index = 0;
flags = 0;
}
/* Set Header */
TLV_TYPE(exti->lan_sid[index]) = htons(EXT_SUBTLV_LAN_ADJ_SID);
/* Only Local ADJ-SID is supported for the moment */
SET_FLAG(flags, EXT_SUBTLV_LINK_ADJ_SID_LFLG);
/* Adjust Length, Flags and Value depending on the type of Label */
if (value_type == SID_LABEL) {
SET_FLAG(flags, EXT_SUBTLV_LINK_ADJ_SID_VFLG);
TLV_LEN(exti->lan_sid[index]) =
htons(SID_LABEL_SIZE(EXT_SUBTLV_PREFIX_RANGE_SIZE));
exti->lan_sid[index].value = htonl(SET_LABEL(value));
} else {
UNSET_FLAG(flags, EXT_SUBTLV_LINK_ADJ_SID_VFLG);
TLV_LEN(exti->lan_sid[index]) =
htons(SID_INDEX_SIZE(EXT_SUBTLV_PREFIX_RANGE_SIZE));
exti->lan_sid[index].value = htonl(value);
}
exti->lan_sid[index].flags = flags; /* Set computed flags */
exti->lan_sid[index].mtid = 0; /* Multi-Topology is not supported */
exti->lan_sid[index].weight = 0; /* Load-Balancing is not supported */
exti->lan_sid[index].neighbor_id = neighbor_id;
}
static void unset_adjacency_sid(struct ext_itf *exti)
{
/* Reset Adjacency TLV */
if (exti->type == ADJ_SID) {
TLV_TYPE(exti->adj_sid[0]) = 0;
TLV_TYPE(exti->adj_sid[1]) = 0;
}
/* or Lan-Adjacency TLV */
if (exti->type == LAN_ADJ_SID) {
TLV_TYPE(exti->lan_sid[0]) = 0;
TLV_TYPE(exti->lan_sid[1]) = 0;
}
}
/* Experimental SubTLV from Cisco */
static void set_rmt_itf_addr(struct ext_itf *exti, struct in_addr rmtif)
{
TLV_TYPE(exti->rmt_itf_addr) = htons(EXT_SUBTLV_RMT_ITF_ADDR);
TLV_LEN(exti->rmt_itf_addr) = htons(sizeof(struct in_addr));
exti->rmt_itf_addr.value = rmtif;
}
/* Delete Extended LSA */
static void ospf_extended_lsa_delete(struct ext_itf *exti)
{
/* Avoid deleting LSA if Extended is not enable */
if (!OspfEXT.enabled)
return;
/* Process only Active Extended Prefix/Link LSA */
if (!CHECK_FLAG(exti->flags, EXT_LPFLG_LSA_ACTIVE))
return;
osr_debug("EXT (%s): Disable %s%s%s-SID on interface %s", __func__,
exti->stype == LOCAL_SID ? "Prefix" : "",
exti->stype == ADJ_SID ? "Adjacency" : "",
exti->stype == LAN_ADJ_SID ? "LAN-Adjacency" : "",
exti->ifp->name);
/* Flush LSA if already engaged */
if (CHECK_FLAG(exti->flags, EXT_LPFLG_LSA_ENGAGED)) {
ospf_ext_lsa_schedule(exti, FLUSH_THIS_LSA);
UNSET_FLAG(exti->flags, EXT_LPFLG_LSA_ENGAGED);
}
/* De-activate this Extended Prefix/Link and remove corresponding
* Segment-Routing Prefix-SID or (LAN)-ADJ-SID */
if (exti->stype == ADJ_SID || exti->stype == LAN_ADJ_SID)
ospf_ext_link_delete_adj_sid(exti);
else
ospf_sr_ext_itf_delete(exti);
}
/*
* Update Extended prefix SID index for Loopback interface type
*
* @param ifname - Loopback interface name
* @param index - new value for the prefix SID of this interface
* @param p - prefix for this interface or NULL if Extended Prefix
* should be remove
*
* @return instance number if update is OK, 0 otherwise
*/
uint32_t ospf_ext_schedule_prefix_index(struct interface *ifp, uint32_t index,
struct prefix_ipv4 *p, uint8_t flags)
{
int rc = 0;
struct ext_itf *exti;
/* Find Extended Prefix interface */
exti = lookup_ext_by_ifp(ifp);
if (exti == NULL)
return rc;
if (p != NULL) {
osr_debug("EXT (%s): Schedule new prefix %pFX with index %u on interface %s", __func__, p, index, ifp->name);
/* Set first Extended Prefix then the Prefix SID information */
set_ext_prefix(exti, OSPF_PATH_INTRA_AREA, EXT_TLV_PREF_NFLG,
*p);
set_prefix_sid(exti, SR_ALGORITHM_SPF, index, SID_INDEX, flags);
/* Try to Schedule LSA */
if (CHECK_FLAG(exti->flags, EXT_LPFLG_LSA_ACTIVE)) {
if (CHECK_FLAG(exti->flags, EXT_LPFLG_LSA_ENGAGED))
ospf_ext_pref_lsa_schedule(exti,
REFRESH_THIS_LSA);
else
ospf_ext_pref_lsa_schedule(
exti, REORIGINATE_THIS_LSA);
}
} else {
osr_debug("EXT (%s): Remove prefix for interface %s", __func__,
ifp->name);
if (CHECK_FLAG(exti->flags, EXT_LPFLG_LSA_ENGAGED))
ospf_ext_pref_lsa_schedule(exti, FLUSH_THIS_LSA);
}
return SET_OPAQUE_LSID(exti->type, exti->instance);
}
/**
* Update Adjacecny-SID for Extended Link LSA
*
* @param exti Extended Link information
*/
static void ospf_ext_link_update_adj_sid(struct ext_itf *exti)
{
mpls_label_t label;
mpls_label_t bck_label;
/* Process only (LAN)Adjacency-SID Type */
if (exti->stype != ADJ_SID && exti->stype != LAN_ADJ_SID)
return;
/* Request Primary & Backup Labels from Label Manager */
bck_label = ospf_sr_local_block_request_label();
label = ospf_sr_local_block_request_label();
if (bck_label == MPLS_INVALID_LABEL || label == MPLS_INVALID_LABEL) {
if (CHECK_FLAG(exti->flags, EXT_LPFLG_LSA_ENGAGED))
ospf_ext_lsa_schedule(exti, FLUSH_THIS_LSA);
return;
}
/* Set Adjacency-SID, backup first */
if (exti->stype == ADJ_SID) {
set_adj_sid(exti, true, bck_label, SID_LABEL);
set_adj_sid(exti, false, label, SID_LABEL);
} else {
set_lan_adj_sid(exti, true, bck_label, SID_LABEL,
exti->lan_sid[0].neighbor_id);
set_lan_adj_sid(exti, false, label, SID_LABEL,
exti->lan_sid[1].neighbor_id);
}
/* Finally, add corresponding SR Link in SRDB & MPLS LFIB */
SET_FLAG(exti->flags, EXT_LPFLG_FIB_ENTRY_SET);
ospf_sr_ext_itf_add(exti);
}
/**
* Delete Adjacecny-SID for Extended Link LSA
*
* @param exti Extended Link information
*/
static void ospf_ext_link_delete_adj_sid(struct ext_itf *exti)
{
/* Process only (LAN)Adjacency-SID Type */
if (exti->stype != ADJ_SID && exti->stype != LAN_ADJ_SID)
return;
/* Release Primary & Backup Labels from Label Manager */
if (exti->stype == ADJ_SID) {
ospf_sr_local_block_release_label(exti->adj_sid[0].value);
ospf_sr_local_block_release_label(exti->adj_sid[1].value);
} else {
ospf_sr_local_block_release_label(exti->lan_sid[0].value);
ospf_sr_local_block_release_label(exti->lan_sid[1].value);
}
/* And reset corresponding TLV */
unset_adjacency_sid(exti);
/* Finally, remove corresponding SR Link in SRDB & MPLS LFIB */
UNSET_FLAG(exti->flags, EXT_LPFLG_FIB_ENTRY_SET);
ospf_sr_ext_itf_delete(exti);
}
/**
* Update Extended Link LSA once Segment Routing Label Block has been changed.
*/
void ospf_ext_link_srlb_update(void)
{
struct listnode *node;
struct ext_itf *exti;
osr_debug("EXT (%s): Update Extended Links with new SRLB", __func__);
/* Update all Extended Link Adjaceny-SID */
for (ALL_LIST_ELEMENTS_RO(OspfEXT.iflist, node, exti)) {
/* Skip Extended Prefix */
if (exti->stype == PREF_SID || exti->stype == LOCAL_SID)
continue;
/* Skip inactive Extended Link */
if (!CHECK_FLAG(exti->flags, EXT_LPFLG_LSA_ACTIVE))
continue;
ospf_ext_link_update_adj_sid(exti);
}
}
/*
* Used by Segment Routing to activate/deactivate Extended Link/Prefix flooding
*
* @param enable To activate or not Segment Routing Extended LSA flooding
*
* @return none
*/
void ospf_ext_update_sr(bool enable)
{
struct listnode *node;
struct ext_itf *exti;
osr_debug("EXT (%s): %s Extended LSAs for Segment Routing ", __func__,
enable ? "Enable" : "Disable");
if (enable) {
OspfEXT.enabled = true;
/* Refresh LSAs if already engaged or originate */
for (ALL_LIST_ELEMENTS_RO(OspfEXT.iflist, node, exti)) {
/* Skip Inactive Extended Link */
if (!CHECK_FLAG(exti->flags, EXT_LPFLG_LSA_ACTIVE))
continue;
/* Update Extended Link (LAN)Adj-SID if not set */
if (!CHECK_FLAG(exti->flags, EXT_LPFLG_FIB_ENTRY_SET))
ospf_ext_link_update_adj_sid(exti);
/* Finally, flood the extended Link */
if (CHECK_FLAG(exti->flags, EXT_LPFLG_LSA_ENGAGED))
ospf_ext_lsa_schedule(exti, REFRESH_THIS_LSA);
else
ospf_ext_lsa_schedule(exti,
REORIGINATE_THIS_LSA);
}
} else {
/* Start by Removing Extended LSA */
for (ALL_LIST_ELEMENTS_RO(OspfEXT.iflist, node, exti))
ospf_extended_lsa_delete(exti);
/* And then disable Extended Link/Prefix */
OspfEXT.enabled = false;
}
}
/*
* -----------------------------------------------------------------------
* Following are callback functions against generic Opaque-LSAs handling
* -----------------------------------------------------------------------
*/
/* Add new Interface in Extended Interface List */
static int ospf_ext_link_new_if(struct interface *ifp)
{
struct ext_itf *new;
int rc = -1;
if (lookup_ext_by_ifp(ifp) != NULL) {
rc = 0; /* Do nothing here. */
return rc;
}
new = XCALLOC(MTYPE_OSPF_EXT_PARAMS, sizeof(struct ext_itf));
/* initialize new information and link back the interface */
new->ifp = ifp;
new->flags = EXT_LPFLG_LSA_INACTIVE;
listnode_add(OspfEXT.iflist, new);
rc = 0;
return rc;
}
/* Remove existing Interface from Extended Interface List */
static int ospf_ext_link_del_if(struct interface *ifp)
{
struct ext_itf *exti;
int rc = -1;
exti = lookup_ext_by_ifp(ifp);
if (exti != NULL) {
/* Flush LSA and remove Adjacency SID */
ospf_extended_lsa_delete(exti);
/* Dequeue listnode entry from the list. */
listnode_delete(OspfEXT.iflist, exti);
XFREE(MTYPE_OSPF_EXT_PARAMS, exti);
rc = 0;
} else {
flog_warn(EC_OSPF_EXT_LSA_UNEXPECTED,
"EXT (%s): interface %s is not found", __func__,
ifp ? ifp->name : "-");
}
return rc;
}
/*
* Determine if an Interface belongs to an Extended Link Adjacency or
* Extended Prefix SID type and allocate new instance value accordingly
*/
static void ospf_ext_ism_change(struct ospf_interface *oi, int old_status)
{
struct ext_itf *exti;
/* Get interface information for Segment Routing */
exti = lookup_ext_by_ifp(oi->ifp);
if (exti == NULL) {
flog_warn(EC_OSPF_EXT_LSA_UNEXPECTED,
"EXT (%s): Cannot get Extended info. from OI(%s)",
__func__, IF_NAME(oi));
return;
}
/* Reset Extended information if ospf interface goes Down */
if (oi->state == ISM_Down) {
ospf_extended_lsa_delete(exti);
exti->area = NULL;
exti->flags = EXT_LPFLG_LSA_INACTIVE;
return;
}
/* Determine if interface is related to a Prefix or an Adjacency SID */
if (oi->type == OSPF_IFTYPE_LOOPBACK) {
exti->stype = PREF_SID;
exti->type = OPAQUE_TYPE_EXTENDED_PREFIX_LSA;
exti->instance = get_ext_pref_instance_value();
exti->area = oi->area;
/* Complete SRDB if the interface belongs to a Prefix */
if (OspfEXT.enabled) {
osr_debug("EXT (%s): Set Prefix SID to interface %s ",
__func__, oi->ifp->name);
ospf_sr_update_local_prefix(oi->ifp, oi->address);
}
} else {
/* Determine if interface is related to Adj. or LAN Adj. SID */
if (oi->state == ISM_DR)
exti->stype = LAN_ADJ_SID;
else
exti->stype = ADJ_SID;
exti->type = OPAQUE_TYPE_EXTENDED_LINK_LSA;
exti->instance = get_ext_link_instance_value();
exti->area = oi->area;
/*
* Note: Adjacency SID information are completed when ospf
* adjacency become up see ospf_ext_link_nsm_change()
*/
if (OspfEXT.enabled)
osr_debug(
"EXT (%s): Set %sAdjacency SID for interface %s ",
__func__, exti->stype == ADJ_SID ? "" : "LAN-",
oi->ifp->name);
}
}
/*
* Finish Extended Link configuration and flood corresponding LSA
* when OSPF adjacency on this link fire up
*/
static void ospf_ext_link_nsm_change(struct ospf_neighbor *nbr, int old_status)
{
struct ospf_interface *oi = nbr->oi;
struct ext_itf *exti;
/* Process Link only when neighbor old or new state is NSM Full */
if (nbr->state != NSM_Full && old_status != NSM_Full)
return;
/* Get interface information for Segment Routing */
exti = lookup_ext_by_ifp(oi->ifp);
if (exti == NULL) {
flog_warn(EC_OSPF_EXT_LSA_UNEXPECTED,
"EXT (%s): Cannot get Extended info. from OI(%s)",
__func__, IF_NAME(oi));
return;
}
/* Check that we have a valid area and ospf context */
if (oi->area == NULL || oi->area->ospf == NULL) {
flog_warn(EC_OSPF_EXT_LSA_UNEXPECTED,
"EXT (%s): Cannot refer to OSPF from OI(%s)",
__func__, IF_NAME(oi));
return;
}
/* Remove Extended Link if Neighbor State goes Down or Deleted */
if (OspfEXT.enabled
&& (nbr->state == NSM_Down || nbr->state == NSM_Deleted)) {
ospf_ext_link_delete_adj_sid(exti);
if (CHECK_FLAG(exti->flags, EXT_LPFLG_LSA_ENGAGED))
ospf_ext_link_lsa_schedule(exti, FLUSH_THIS_LSA);
exti->flags = EXT_LPFLG_LSA_INACTIVE;
return;
}
/* Keep Area information in combination with SR info. */
exti->area = oi->area;
/* Process only Adjacency/LAN SID */
if (exti->stype == PREF_SID)
return;
switch (oi->state) {
case ISM_PointToPoint:
/* Segment ID is an Adjacency one */
exti->stype = ADJ_SID;
/* Set Extended Link TLV with link_id == Nbr Router ID */
set_ext_link(exti, OSPF_IFTYPE_POINTOPOINT, nbr->router_id,
oi->address->u.prefix4);
/* And Remote Interface address */
set_rmt_itf_addr(exti, nbr->address.u.prefix4);
break;
case ISM_DR:
/* Segment ID is a LAN Adjacency for the DR only */
exti->stype = LAN_ADJ_SID;
/* Set Extended Link TLV with link_id == DR */
set_ext_link(exti, OSPF_IFTYPE_BROADCAST, DR(oi),
oi->address->u.prefix4);
/* Set Neighbor ID */
exti->lan_sid[0].neighbor_id = nbr->router_id;
exti->lan_sid[1].neighbor_id = nbr->router_id;
break;
case ISM_DROther:
case ISM_Backup:
/* Segment ID is an Adjacency if not the DR */
exti->stype = ADJ_SID;
/* Set Extended Link TLV with link_id == DR */
set_ext_link(exti, OSPF_IFTYPE_BROADCAST, DR(oi),
oi->address->u.prefix4);
break;
default:
if (CHECK_FLAG(exti->flags, EXT_LPFLG_FIB_ENTRY_SET))
ospf_ext_link_delete_adj_sid(exti);
if (CHECK_FLAG(exti->flags, EXT_LPFLG_LSA_ENGAGED))
ospf_ext_link_lsa_schedule(exti, FLUSH_THIS_LSA);
exti->flags = EXT_LPFLG_LSA_INACTIVE;
return;
}
SET_FLAG(exti->flags, EXT_LPFLG_LSA_ACTIVE);
if (OspfEXT.enabled) {
osr_debug("EXT (%s): Set %sAdjacency SID for interface %s ",
__func__, exti->stype == ADJ_SID ? "" : "LAN-",
oi->ifp->name);
/* Update (LAN)Adjacency SID */
ospf_ext_link_update_adj_sid(exti);
/* flood this links params if everything is ok */
if (CHECK_FLAG(exti->flags, EXT_LPFLG_LSA_ENGAGED))
ospf_ext_link_lsa_schedule(exti, REFRESH_THIS_LSA);
else
ospf_ext_link_lsa_schedule(exti, REORIGINATE_THIS_LSA);
}
}
/* Callbacks to handle Extended Link Segment Routing LSA information */
static int ospf_ext_link_lsa_update(struct ospf_lsa *lsa)
{
/* Sanity Check */
if (lsa == NULL) {
flog_warn(EC_OSPF_LSA_NULL, "EXT (%s): Abort! LSA is NULL",
__func__);
return -1;
}
/* Process only Opaque LSA */
if ((lsa->data->type != OSPF_OPAQUE_AREA_LSA)
&& (lsa->data->type != OSPF_OPAQUE_AS_LSA))
return 0;
/* Process only Extended Link LSA */
if (GET_OPAQUE_TYPE(ntohl(lsa->data->id.s_addr))
!= OPAQUE_TYPE_EXTENDED_LINK_LSA)
return 0;
/* Check if it is not my LSA */
if (IS_LSA_SELF(lsa))
return 0;
/* Check if Extended is enable */
if (!OspfEXT.enabled)
return 0;
/* Call Segment Routing LSA update or deletion */
if (!IS_LSA_MAXAGE(lsa))
ospf_sr_ext_link_lsa_update(lsa);
else
ospf_sr_ext_link_lsa_delete(lsa);
return 0;
}
/* Callbacks to handle Extended Prefix Segment Routing LSA information */
static int ospf_ext_pref_lsa_update(struct ospf_lsa *lsa)
{
/* Sanity Check */
if (lsa == NULL) {
flog_warn(EC_OSPF_LSA_NULL, "EXT (%s): Abort! LSA is NULL",
__func__);
return -1;
}
/* Process only Opaque LSA */
if ((lsa->data->type != OSPF_OPAQUE_AREA_LSA)
&& (lsa->data->type != OSPF_OPAQUE_AS_LSA))
return 0;
/* Process only Extended Prefix LSA */
if (GET_OPAQUE_TYPE(ntohl(lsa->data->id.s_addr))
!= OPAQUE_TYPE_EXTENDED_PREFIX_LSA)
return 0;
/* Check if it is not my LSA */
if (IS_LSA_SELF(lsa))
return 0;
/* Check if Extended is enable */
if (!OspfEXT.enabled)
return 0;
/* Call Segment Routing LSA update or deletion */
if (!IS_LSA_MAXAGE(lsa))
ospf_sr_ext_prefix_lsa_update(lsa);
else
ospf_sr_ext_prefix_lsa_delete(lsa);
return 0;
}
/*
* -------------------------------------------------------
* Following are OSPF protocol processing functions for
* Extended Prefix/Link Opaque LSA
* -------------------------------------------------------
*/
static void build_tlv_header(struct stream *s, struct tlv_header *tlvh)
{
stream_put(s, tlvh, sizeof(struct tlv_header));
}
static void build_tlv(struct stream *s, struct tlv_header *tlvh)
{
if ((tlvh != NULL) && (ntohs(tlvh->type) != 0)) {
build_tlv_header(s, tlvh);
stream_put(s, TLV_DATA(tlvh), TLV_BODY_SIZE(tlvh));
}
}
/* Build an Extended Prefix Opaque LSA body for extended prefix TLV */
static void ospf_ext_pref_lsa_body_set(struct stream *s, struct ext_itf *exti)
{
/* Sanity check */
if ((exti == NULL) || (exti->stype != PREF_SID))
return;