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frr/isisd/isis_pdu.c

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/*
* IS-IS Rout(e)ing protocol - isis_pdu.c
* PDU processing
*
* Copyright (C) 2001,2002 Sampo Saaristo
* Tampere University of Technology
* Institute of Communications Engineering
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public Licenseas 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 <zebra.h>
#include "memory.h"
#include "thread.h"
#include "linklist.h"
#include "log.h"
#include "stream.h"
#include "vty.h"
#include "hash.h"
#include "prefix.h"
#include "if.h"
#include "checksum.h"
#include "md5.h"
#include "lib_errors.h"
#include "isisd/isis_constants.h"
#include "isisd/isis_common.h"
#include "isisd/isis_flags.h"
#include "isisd/isis_adjacency.h"
#include "isisd/isis_circuit.h"
#include "isisd/isis_network.h"
#include "isisd/isis_misc.h"
#include "isisd/isis_dr.h"
#include "isisd/isisd.h"
#include "isisd/isis_dynhn.h"
#include "isisd/isis_lsp.h"
#include "isisd/isis_pdu.h"
#include "isisd/iso_checksum.h"
#include "isisd/isis_csm.h"
#include "isisd/isis_events.h"
#include "isisd/isis_te.h"
#include "isisd/isis_mt.h"
#include "isisd/isis_tlvs.h"
#include "isisd/isis_errors.h"
#include "isisd/fabricd.h"
#include "isisd/isis_tx_queue.h"
#include "isisd/isis_pdu_counter.h"
#include "isisd/isis_nb.h"
static int ack_lsp(struct isis_lsp_hdr *hdr, struct isis_circuit *circuit,
int level)
{
unsigned long lenp;
int retval;
uint16_t length;
uint8_t pdu_type =
(level == IS_LEVEL_1) ? L1_PARTIAL_SEQ_NUM : L2_PARTIAL_SEQ_NUM;
isis_circuit_stream(circuit, &circuit->snd_stream);
fill_fixed_hdr(pdu_type, circuit->snd_stream);
lenp = stream_get_endp(circuit->snd_stream);
stream_putw(circuit->snd_stream, 0); /* PDU length */
stream_put(circuit->snd_stream, circuit->isis->sysid, ISIS_SYS_ID_LEN);
stream_putc(circuit->snd_stream, circuit->idx);
stream_putc(circuit->snd_stream, 9); /* code */
stream_putc(circuit->snd_stream, 16); /* len */
stream_putw(circuit->snd_stream, hdr->rem_lifetime);
stream_put(circuit->snd_stream, hdr->lsp_id, ISIS_SYS_ID_LEN + 2);
stream_putl(circuit->snd_stream, hdr->seqno);
stream_putw(circuit->snd_stream, hdr->checksum);
length = (uint16_t)stream_get_endp(circuit->snd_stream);
/* Update PDU length */
stream_putw_at(circuit->snd_stream, lenp, length);
pdu_counter_count(circuit->area->pdu_tx_counters, pdu_type);
retval = circuit->tx(circuit, level);
if (retval != ISIS_OK)
flog_err(EC_ISIS_PACKET,
"ISIS-Upd (%s): Send L%d LSP PSNP on %s failed",
circuit->area->area_tag, level,
circuit->interface->name);
return retval;
}
/*
* RECEIVE SIDE
*/
struct iih_info {
struct isis_circuit *circuit;
uint8_t *ssnpa;
int level;
uint8_t circ_type;
uint8_t sys_id[ISIS_SYS_ID_LEN];
uint16_t holdtime;
uint16_t pdu_len;
uint8_t circuit_id;
uint8_t priority;
uint8_t dis[ISIS_SYS_ID_LEN + 1];
bool v4_usable;
bool v6_usable;
struct isis_tlvs *tlvs;
};
static int process_p2p_hello(struct iih_info *iih)
{
struct isis_threeway_adj *tw_adj = iih->tlvs->threeway_adj;
if (tw_adj) {
if (tw_adj->state > ISIS_THREEWAY_DOWN) {
if (IS_DEBUG_ADJ_PACKETS) {
zlog_debug("ISIS-Adj (%s): Rcvd P2P IIH from (%s) with invalid three-way state: %d",
iih->circuit->area->area_tag,
iih->circuit->interface->name,
tw_adj->state);
}
return ISIS_WARNING;
}
if (tw_adj->neighbor_set
&& (memcmp(tw_adj->neighbor_id, iih->circuit->isis->sysid,
ISIS_SYS_ID_LEN)
|| tw_adj->neighbor_circuit_id
!= (uint32_t)iih->circuit->idx)) {
if (IS_DEBUG_ADJ_PACKETS) {
zlog_debug("ISIS-Adj (%s): Rcvd P2P IIH from (%s) which lists IS/Circuit different from us as neighbor.",
iih->circuit->area->area_tag,
iih->circuit->interface->name);
}
return ISIS_WARNING;
}
}
/*
* My interpertation of the ISO, if no adj exists we will create one for
* the circuit
*/
struct isis_adjacency *adj = iih->circuit->u.p2p.neighbor;
/* If an adjacency exists, check it is with the source of the hello
* packets */
if (adj) {
if (memcmp(iih->sys_id, adj->sysid, ISIS_SYS_ID_LEN)) {
zlog_debug(
"hello source and adjacency do not match, set adj down\n");
isis_adj_state_change(&adj, ISIS_ADJ_DOWN,
"adj do not exist");
return ISIS_OK;
}
}
if (!adj || adj->level != iih->circ_type) {
if (!adj) {
adj = isis_new_adj(iih->sys_id, NULL, iih->circ_type,
iih->circuit);
} else {
adj->level = iih->circ_type;
}
iih->circuit->u.p2p.neighbor = adj;
/* Build lsp with the new neighbor entry when a new
* adjacency is formed. Set adjacency circuit type to
* IIH PDU header circuit type before lsp is regenerated
* when an adjacency is up. This will result in the new
* adjacency entry getting added to the lsp tlv neighbor list.
*/
adj->circuit_t = iih->circ_type;
isis_adj_state_change(&adj, ISIS_ADJ_INITIALIZING, NULL);
adj->sys_type = ISIS_SYSTYPE_UNKNOWN;
}
if (tw_adj)
adj->ext_circuit_id = tw_adj->local_circuit_id;
/* 8.2.6 Monitoring point-to-point adjacencies */
adj->hold_time = iih->holdtime;
adj->last_upd = time(NULL);
bool changed;
isis_tlvs_to_adj(iih->tlvs, adj, &changed);
changed |= tlvs_to_adj_mt_set(iih->tlvs, iih->v4_usable, iih->v6_usable,
adj);
/* lets take care of the expiry */
thread_cancel(&adj->t_expire);
thread_add_timer(master, isis_adj_expire, adj, (long)adj->hold_time,
&adj->t_expire);
/* While fabricds initial sync is in progress, ignore hellos from other
* interfaces than the one we are performing the initial sync on. */
if (fabricd_initial_sync_is_in_progress(iih->circuit->area)
&& fabricd_initial_sync_circuit(iih->circuit->area) != iih->circuit)
return ISIS_OK;
/* 8.2.5.2 a) a match was detected */
if (isis_tlvs_area_addresses_match(iih->tlvs,
iih->circuit->area->area_addrs)) {
/* 8.2.5.2 a) 2) If the system is L1 - table 5 */
if (iih->circuit->area->is_type == IS_LEVEL_1) {
switch (iih->circ_type) {
case IS_LEVEL_1:
case IS_LEVEL_1_AND_2:
if (adj->adj_state != ISIS_ADJ_UP
|| adj->adj_usage == ISIS_ADJ_LEVEL1) {
isis_adj_process_threeway(adj, tw_adj,
ISIS_ADJ_LEVEL1);
}
break;
case IS_LEVEL_2:
if (adj->adj_state != ISIS_ADJ_UP) {
/* (7) reject - wrong system type event
*/
zlog_warn("wrongSystemType");
return ISIS_WARNING;
} else if (adj->adj_usage == ISIS_ADJ_LEVEL1) {
/* (6) down - wrong system */
isis_adj_state_change(&adj,
ISIS_ADJ_DOWN,
"Wrong System");
}
break;
}
}
/* 8.2.5.2 a) 3) If the system is L1L2 - table 6 */
if (iih->circuit->area->is_type == IS_LEVEL_1_AND_2) {
switch (iih->circ_type) {
case IS_LEVEL_1:
if (adj->adj_state != ISIS_ADJ_UP
|| adj->adj_usage == ISIS_ADJ_LEVEL1) {
isis_adj_process_threeway(adj, tw_adj,
ISIS_ADJ_LEVEL1);
} else if ((adj->adj_usage
== ISIS_ADJ_LEVEL1AND2)
|| (adj->adj_usage
== ISIS_ADJ_LEVEL2)) {
/* (8) down - wrong system */
isis_adj_state_change(&adj,
ISIS_ADJ_DOWN,
"Wrong System");
}
break;
case IS_LEVEL_2:
if (adj->adj_state != ISIS_ADJ_UP
|| adj->adj_usage == ISIS_ADJ_LEVEL2) {
isis_adj_process_threeway(adj, tw_adj,
ISIS_ADJ_LEVEL2);
} else if ((adj->adj_usage == ISIS_ADJ_LEVEL1)
|| (adj->adj_usage
== ISIS_ADJ_LEVEL1AND2)) {
/* (8) down - wrong system */
isis_adj_state_change(&adj,
ISIS_ADJ_DOWN,
"Wrong System");
}
break;
case IS_LEVEL_1_AND_2:
if (adj->adj_state != ISIS_ADJ_UP
|| adj->adj_usage == ISIS_ADJ_LEVEL1AND2) {
isis_adj_process_threeway(adj, tw_adj,
ISIS_ADJ_LEVEL1AND2);
} else if ((adj->adj_usage == ISIS_ADJ_LEVEL1)
|| (adj->adj_usage
== ISIS_ADJ_LEVEL2)) {
/* (8) down - wrong system */
isis_adj_state_change(&adj,
ISIS_ADJ_DOWN,
"Wrong System");
}
break;
}
}
/* 8.2.5.2 a) 4) If the system is L2 - table 7 */
if (iih->circuit->area->is_type == IS_LEVEL_2) {
switch (iih->circ_type) {
case IS_LEVEL_1:
if (adj->adj_state != ISIS_ADJ_UP) {
/* (5) reject - wrong system type event
*/
zlog_warn("wrongSystemType");
return ISIS_WARNING;
} else if ((adj->adj_usage
== ISIS_ADJ_LEVEL1AND2)
|| (adj->adj_usage
== ISIS_ADJ_LEVEL2)) {
/* (6) down - wrong system */
isis_adj_state_change(&adj,
ISIS_ADJ_DOWN,
"Wrong System");
}
break;
case IS_LEVEL_1_AND_2:
case IS_LEVEL_2:
if (adj->adj_state != ISIS_ADJ_UP
|| adj->adj_usage == ISIS_ADJ_LEVEL2) {
isis_adj_process_threeway(adj, tw_adj,
ISIS_ADJ_LEVEL2);
} else if (adj->adj_usage
== ISIS_ADJ_LEVEL1AND2) {
/* (6) down - wrong system */
isis_adj_state_change(&adj,
ISIS_ADJ_DOWN,
"Wrong System");
}
break;
}
}
}
/* 8.2.5.2 b) if no match was detected */
else if (listcount(iih->circuit->area->area_addrs) > 0) {
if (iih->circuit->area->is_type == IS_LEVEL_1) {
/* 8.2.5.2 b) 1) is_type L1 and adj is not up */
if (adj->adj_state != ISIS_ADJ_UP) {
isis_adj_state_change(&adj, ISIS_ADJ_DOWN,
"Area Mismatch");
/* 8.2.5.2 b) 2)is_type L1 and adj is up */
} else {
isis_adj_state_change(&adj, ISIS_ADJ_DOWN,
"Down - Area Mismatch");
}
}
/* 8.2.5.2 b 3 If the system is L2 or L1L2 - table 8 */
else {
switch (iih->circ_type) {
case IS_LEVEL_1:
if (adj->adj_state != ISIS_ADJ_UP) {
/* (6) reject - Area Mismatch event */
zlog_warn("AreaMismatch");
return ISIS_WARNING;
} else if (adj->adj_usage == ISIS_ADJ_LEVEL1) {
/* (7) down - area mismatch */
isis_adj_state_change(&adj,
ISIS_ADJ_DOWN,
"Area Mismatch");
} else if ((adj->adj_usage
== ISIS_ADJ_LEVEL1AND2)
|| (adj->adj_usage
== ISIS_ADJ_LEVEL2)) {
/* (7) down - wrong system */
isis_adj_state_change(&adj,
ISIS_ADJ_DOWN,
"Wrong System");
}
break;
case IS_LEVEL_1_AND_2:
case IS_LEVEL_2:
if (adj->adj_state != ISIS_ADJ_UP
|| adj->adj_usage == ISIS_ADJ_LEVEL2) {
isis_adj_process_threeway(adj, tw_adj,
ISIS_ADJ_LEVEL2);
} else if (adj->adj_usage == ISIS_ADJ_LEVEL1) {
/* (7) down - wrong system */
isis_adj_state_change(&adj,
ISIS_ADJ_DOWN,
"Wrong System");
} else if (adj->adj_usage
== ISIS_ADJ_LEVEL1AND2) {
if (iih->circ_type == IS_LEVEL_2) {
/* (7) down - wrong system */
isis_adj_state_change(
&adj, ISIS_ADJ_DOWN,
"Wrong System");
} else {
/* (7) down - area mismatch */
isis_adj_state_change(
&adj, ISIS_ADJ_DOWN,
"Area Mismatch");
}
}
break;
}
}
} else {
/* down - area mismatch */
isis_adj_state_change(&adj, ISIS_ADJ_DOWN, "Area Mismatch");
}
if (adj) {
if (adj->adj_state == ISIS_ADJ_UP && changed) {
lsp_regenerate_schedule(
adj->circuit->area,
isis_adj_usage2levels(adj->adj_usage), 0);
}
/* 8.2.5.2 c) if the action was up - comparing circuit IDs */
/* FIXME - Missing parts */
/* some of my own understanding of the ISO, why the heck does
* it not say what should I change the system_type to...
*/
switch (adj->adj_usage) {
case ISIS_ADJ_LEVEL1:
adj->sys_type = ISIS_SYSTYPE_L1_IS;
break;
case ISIS_ADJ_LEVEL2:
adj->sys_type = ISIS_SYSTYPE_L2_IS;
break;
case ISIS_ADJ_LEVEL1AND2:
adj->sys_type = ISIS_SYSTYPE_L2_IS;
break;
case ISIS_ADJ_NONE:
adj->sys_type = ISIS_SYSTYPE_UNKNOWN;
break;
}
}
if (IS_DEBUG_ADJ_PACKETS) {
zlog_debug(
"ISIS-Adj (%s): Rcvd P2P IIH from (%s), cir type %s, cir id %hhu, length %hu",
iih->circuit->area->area_tag,
iih->circuit->interface->name,
circuit_t2string(iih->circuit->is_type),
iih->circuit->circuit_id, iih->pdu_len);
}
return ISIS_OK;
}
static int process_lan_hello(struct iih_info *iih)
{
struct isis_adjacency *adj;
adj = isis_adj_lookup(iih->sys_id,
iih->circuit->u.bc.adjdb[iih->level - 1]);
if ((adj == NULL) || (memcmp(adj->snpa, iih->ssnpa, ETH_ALEN))
|| (adj->level != iih->level)) {
if (!adj) {
/* Do as in 8.4.2.5 */
adj = isis_new_adj(iih->sys_id, iih->ssnpa, iih->level,
iih->circuit);
} else {
if (iih->ssnpa) {
memcpy(adj->snpa, iih->ssnpa, 6);
} else {
memset(adj->snpa, ' ', 6);
}
adj->level = iih->level;
}
isis_adj_state_change(&adj, ISIS_ADJ_INITIALIZING, NULL);
if (iih->level == IS_LEVEL_1)
adj->sys_type = ISIS_SYSTYPE_L1_IS;
else
adj->sys_type = ISIS_SYSTYPE_L2_IS;
list_delete_all_node(
iih->circuit->u.bc.lan_neighs[iih->level - 1]);
isis_adj_build_neigh_list(
iih->circuit->u.bc.adjdb[iih->level - 1],
iih->circuit->u.bc.lan_neighs[iih->level - 1]);
}
if (adj->dis_record[iih->level - 1].dis == ISIS_IS_DIS) {
uint8_t *dis = (iih->level == 1)
? iih->circuit->u.bc.l1_desig_is
: iih->circuit->u.bc.l2_desig_is;
if (memcmp(dis, iih->dis, ISIS_SYS_ID_LEN + 1)) {
thread_add_event(master, isis_event_dis_status_change,
iih->circuit, 0, NULL);
memcpy(dis, iih->dis, ISIS_SYS_ID_LEN + 1);
}
}
adj->circuit_t = iih->circ_type;
adj->hold_time = iih->holdtime;
adj->last_upd = time(NULL);
adj->prio[iih->level - 1] = iih->priority;
memcpy(adj->lanid, iih->dis, ISIS_SYS_ID_LEN + 1);
bool changed;
isis_tlvs_to_adj(iih->tlvs, adj, &changed);
changed |= tlvs_to_adj_mt_set(iih->tlvs, iih->v4_usable, iih->v6_usable,
adj);
/* lets take care of the expiry */
thread_cancel(&adj->t_expire);
thread_add_timer(master, isis_adj_expire, adj, (long)adj->hold_time,
&adj->t_expire);
/*
* If the snpa for this circuit is found from LAN Neighbours TLV
* we have two-way communication -> adjacency can be put to state "up"
*/
bool own_snpa_found =
isis_tlvs_own_snpa_found(iih->tlvs, iih->circuit->u.bc.snpa);
if (adj->adj_state != ISIS_ADJ_UP) {
if (own_snpa_found) {
isis_adj_state_change(
&adj, ISIS_ADJ_UP,
"own SNPA found in LAN Neighbours TLV");
}
} else {
if (!own_snpa_found) {
isis_adj_state_change(
&adj, ISIS_ADJ_INITIALIZING,
"own SNPA not found in LAN Neighbours TLV");
}
}
if (adj->adj_state == ISIS_ADJ_UP && changed)
lsp_regenerate_schedule(adj->circuit->area, iih->level, 0);
if (IS_DEBUG_ADJ_PACKETS) {
zlog_debug(
"ISIS-Adj (%s): Rcvd L%d LAN IIH from %s on %s, cirType %s, cirID %u, length %zd",
iih->circuit->area->area_tag, iih->level,
snpa_print(iih->ssnpa), iih->circuit->interface->name,
circuit_t2string(iih->circuit->is_type),
iih->circuit->circuit_id,
stream_get_endp(iih->circuit->rcv_stream));
}
return ISIS_OK;
}
static int pdu_len_validate(uint16_t pdu_len, struct isis_circuit *circuit)
{
if (pdu_len < stream_get_getp(circuit->rcv_stream)
|| pdu_len > ISO_MTU(circuit)
|| pdu_len > stream_get_endp(circuit->rcv_stream))
return 1;
if (pdu_len < stream_get_endp(circuit->rcv_stream))
stream_set_endp(circuit->rcv_stream, pdu_len);
return 0;
}
static int process_hello(uint8_t pdu_type, struct isis_circuit *circuit,
uint8_t *ssnpa)
{
/* keep a copy of the raw pdu for NB notifications */
size_t pdu_start = stream_get_getp(circuit->rcv_stream);
size_t pdu_end = stream_get_endp(circuit->rcv_stream);
char raw_pdu[pdu_end - pdu_start];
bool p2p_hello = (pdu_type == P2P_HELLO);
int level = p2p_hello ? 0
: (pdu_type == L1_LAN_HELLO) ? ISIS_LEVEL1
: ISIS_LEVEL2;
const char *pdu_name =
p2p_hello
? "P2P IIH"
: (level == ISIS_LEVEL1) ? "L1 LAN IIH" : "L2 LAN IIH";
stream_get_from(raw_pdu, circuit->rcv_stream, pdu_start,
pdu_end - pdu_start);
if (IS_DEBUG_ADJ_PACKETS) {
zlog_debug("ISIS-Adj (%s): Rcvd %s on %s, cirType %s, cirID %u",
circuit->area->area_tag, pdu_name,
circuit->interface->name,
circuit_t2string(circuit->is_type),
circuit->circuit_id);
if (IS_DEBUG_PACKET_DUMP)
zlog_dump_data(STREAM_DATA(circuit->rcv_stream),
stream_get_endp(circuit->rcv_stream));
}
if (p2p_hello) {
if (circuit->circ_type != CIRCUIT_T_P2P) {
zlog_warn("p2p hello on non p2p circuit");
circuit->rej_adjacencies++;
#ifndef FABRICD
isis_notif_reject_adjacency(
circuit, "p2p hello on non p2p circuit",
raw_pdu);
#endif /* ifndef FABRICD */
return ISIS_WARNING;
}
} else {
if (circuit->circ_type != CIRCUIT_T_BROADCAST) {
zlog_warn("lan hello on non broadcast circuit");
circuit->rej_adjacencies++;
#ifndef FABRICD
isis_notif_reject_adjacency(
circuit, "lan hello on non broadcast circuit",
raw_pdu);
#endif /* ifndef FABRICD */
return ISIS_WARNING;
}
if (circuit->ext_domain) {
zlog_debug(
"level %d LAN Hello received over circuit with externalDomain = true",
level);
circuit->rej_adjacencies++;
#ifndef FABRICD
isis_notif_reject_adjacency(
circuit,
"LAN Hello received over circuit with externalDomain = true",
raw_pdu);
#endif /* ifndef FABRICD */
return ISIS_WARNING;
}
if (!(circuit->is_type & level)) {
if (IS_DEBUG_ADJ_PACKETS) {
zlog_debug(
"ISIS-Adj (%s): Interface level mismatch, %s",
circuit->area->area_tag,
circuit->interface->name);
}
circuit->rej_adjacencies++;
#ifndef FABRICD
isis_notif_reject_adjacency(
circuit, "Interface level mismatch", raw_pdu);
#endif /* ifndef FABRICD */
return ISIS_WARNING;
}
}
struct iih_info iih = {
.circuit = circuit, .ssnpa = ssnpa, .level = level};
/* Generic IIH Header */
iih.circ_type = stream_getc(circuit->rcv_stream) & 0x03;
stream_get(iih.sys_id, circuit->rcv_stream, ISIS_SYS_ID_LEN);
iih.holdtime = stream_getw(circuit->rcv_stream);
iih.pdu_len = stream_getw(circuit->rcv_stream);
if (p2p_hello) {
iih.circuit_id = stream_getc(circuit->rcv_stream);
} else {
iih.priority = stream_getc(circuit->rcv_stream);
stream_get(iih.dis, circuit->rcv_stream, ISIS_SYS_ID_LEN + 1);
}
if (pdu_len_validate(iih.pdu_len, circuit)) {
zlog_warn(
"ISIS-Adj (%s): Rcvd %s from (%s) with invalid pdu length %hu",
circuit->area->area_tag, pdu_name,
circuit->interface->name, iih.pdu_len);
circuit->rej_adjacencies++;
#ifndef FABRICD
isis_notif_reject_adjacency(circuit, "Invalid PDU length",
raw_pdu);
#endif /* ifndef FABRICD */
return ISIS_WARNING;
}
if (!p2p_hello && !(level & iih.circ_type)) {
flog_err(EC_ISIS_PACKET,
"Level %d LAN Hello with Circuit Type %d", level,
iih.circ_type);
circuit->rej_adjacencies++;
#ifndef FABRICD
isis_notif_reject_adjacency(
circuit, "LAN Hello with wrong IS-level", raw_pdu);
#endif /* ifndef FABRICD */
return ISIS_ERROR;
}
const char *error_log;
int retval = ISIS_WARNING;
if (isis_unpack_tlvs(STREAM_READABLE(circuit->rcv_stream),
circuit->rcv_stream, &iih.tlvs, &error_log)) {
zlog_warn("isis_unpack_tlvs() failed: %s", error_log);
circuit->rej_adjacencies++;
#ifndef FABRICD
isis_notif_reject_adjacency(circuit, "Failed to unpack TLVs",
raw_pdu);
#endif /* ifndef FABRICD */
goto out;
}
if (!iih.tlvs->area_addresses.count) {
zlog_warn("No Area addresses TLV in %s", pdu_name);
#ifndef FABRICD
/* send northbound notification */
isis_notif_area_mismatch(circuit, raw_pdu);
#endif /* ifndef FABRICD */
goto out;
}
if (!iih.tlvs->protocols_supported.count) {
zlog_warn("No supported protocols TLV in %s", pdu_name);
circuit->rej_adjacencies++;
#ifndef FABRICD
isis_notif_reject_adjacency(
circuit, "No supported protocols TLV", raw_pdu);
#endif /* ifndef FABRICD */
goto out;
}
int auth_code = isis_tlvs_auth_is_valid(iih.tlvs, &circuit->passwd,
circuit->rcv_stream, false);
if (auth_code != ISIS_AUTH_OK) {
isis_event_auth_failure(circuit->area->area_tag,
"IIH authentication failure",
iih.sys_id);
#ifndef FABRICD
/* send northbound notification */
stream_get_from(raw_pdu, circuit->rcv_stream, pdu_start,
pdu_end - pdu_start);
if (auth_code == ISIS_AUTH_FAILURE) {
circuit->auth_failures++;
isis_notif_authentication_failure(circuit, raw_pdu);
} else { /* AUTH_TYPE_FAILURE or NO_VALIDATOR */
circuit->auth_type_failures++;
isis_notif_authentication_type_failure(circuit,
raw_pdu);
}
#endif /* ifndef FABRICD */
goto out;
}
if (!memcmp(iih.sys_id, circuit->isis->sysid, ISIS_SYS_ID_LEN)) {
zlog_warn(
"ISIS-Adj (%s): Received IIH with own sysid on %s - discard",
circuit->area->area_tag, circuit->interface->name);
circuit->rej_adjacencies++;
#ifndef FABRICD
isis_notif_reject_adjacency(
circuit, "Received IIH with our own sysid", raw_pdu);
#endif /* ifndef FABRICD */
goto out;
}
if (!p2p_hello
&& (listcount(circuit->area->area_addrs) == 0
|| (level == ISIS_LEVEL1
&& !isis_tlvs_area_addresses_match(
iih.tlvs, circuit->area->area_addrs)))) {
if (IS_DEBUG_ADJ_PACKETS) {
zlog_debug(
"ISIS-Adj (%s): Area mismatch, level %d IIH on %s",
circuit->area->area_tag, level,
circuit->interface->name);
}
#ifndef FABRICD
/* send northbound notification */
isis_notif_area_mismatch(circuit, raw_pdu);
#endif /* ifndef FABRICD */
goto out;
}
iih.v4_usable = (fabricd_ip_addrs(circuit)
&& iih.tlvs->ipv4_address.count);
iih.v6_usable = (circuit->ipv6_link && listcount(circuit->ipv6_link)
&& iih.tlvs->ipv6_address.count);
if (!iih.v4_usable && !iih.v6_usable) {
if (IS_DEBUG_ADJ_PACKETS) {
zlog_warn(
"ISIS-Adj (%s): Neither IPv4 nor IPv6 considered usable. Ignoring IIH",
circuit->area->area_tag);
}
circuit->rej_adjacencies++;
#ifndef FABRICD
isis_notif_reject_adjacency(
circuit, "Neither IPv4 not IPv6 considered usable",
raw_pdu);
#endif /* ifndef FABRICD */
goto out;
}
retval = p2p_hello ? process_p2p_hello(&iih) : process_lan_hello(&iih);
out:
isis_free_tlvs(iih.tlvs);
return retval;
}
static void lsp_flood_or_update(struct isis_lsp *lsp,
struct isis_circuit *circuit,
bool circuit_scoped)
{
if (!circuit_scoped)
lsp_flood(lsp, circuit);
else
fabricd_update_lsp_no_flood(lsp, circuit);
}
/*
* Process Level 1/2 Link State
* ISO - 10589
* Section 7.3.15.1 - Action on receipt of a link state PDU
*/
static int process_lsp(uint8_t pdu_type, struct isis_circuit *circuit,
const uint8_t *ssnpa, uint8_t max_area_addrs)
{
int level;
bool circuit_scoped;
size_t pdu_start = stream_get_getp(circuit->rcv_stream);
size_t pdu_end = stream_get_endp(circuit->rcv_stream);
char raw_pdu[pdu_end - pdu_start];
stream_get_from(raw_pdu, circuit->rcv_stream, pdu_start,
pdu_end - pdu_start);
if (pdu_type == FS_LINK_STATE) {
if (!fabricd)
return ISIS_ERROR;
if (max_area_addrs != L2_CIRCUIT_FLOODING_SCOPE)
return ISIS_ERROR;
level = ISIS_LEVEL2;
circuit_scoped = true;
/* The stream is used verbatim for sending out new LSPDUs.
* So make sure we store it as an L2 LSPDU internally.
* (compare for the reverse in `send_lsp`) */
stream_putc_at(circuit->rcv_stream, 4, L2_LINK_STATE);
stream_putc_at(circuit->rcv_stream, 7, 0);
} else {
if (pdu_type == L1_LINK_STATE)
level = ISIS_LEVEL1;
else
level = ISIS_LEVEL2;
circuit_scoped = false;
}
if (IS_DEBUG_UPDATE_PACKETS) {
zlog_debug(
"ISIS-Upd (%s): Rcvd %sL%d LSP on %s, cirType %s, cirID %u",
circuit->area->area_tag,
circuit_scoped ? "Circuit scoped " : "", level,
circuit->interface->name,
circuit_t2string(circuit->is_type),
circuit->circuit_id);
if (IS_DEBUG_PACKET_DUMP)
zlog_dump_data(STREAM_DATA(circuit->rcv_stream),
stream_get_endp(circuit->rcv_stream));
}
struct isis_lsp_hdr hdr = {};
hdr.pdu_len = stream_getw(circuit->rcv_stream);
hdr.rem_lifetime = stream_getw(circuit->rcv_stream);
stream_get(hdr.lsp_id, circuit->rcv_stream, sizeof(hdr.lsp_id));
hdr.seqno = stream_getl(circuit->rcv_stream);
hdr.checksum = stream_getw(circuit->rcv_stream);
hdr.lsp_bits = stream_getc(circuit->rcv_stream);
#ifndef FABRICD
/* send northbound notification */
isis_notif_lsp_received(circuit, rawlspid_print(hdr.lsp_id), hdr.seqno,
time(NULL), sysid_print(hdr.lsp_id));
#endif /* ifndef FABRICD */
if (pdu_len_validate(hdr.pdu_len, circuit)) {
zlog_debug("ISIS-Upd (%s): LSP %s invalid LSP length %hu",
circuit->area->area_tag, rawlspid_print(hdr.lsp_id),
hdr.pdu_len);
return ISIS_WARNING;
}
if (IS_DEBUG_UPDATE_PACKETS) {
zlog_debug("ISIS-Upd (%s): Rcvd L%d LSP %s, seq 0x%08x, cksum 0x%04hx, lifetime %hus, len %hu, on %s",
circuit->area->area_tag, level,
rawlspid_print(hdr.lsp_id), hdr.seqno, hdr.checksum,
hdr.rem_lifetime, hdr.pdu_len,
circuit->interface->name);
}
/* lsp is_type check */
if ((hdr.lsp_bits & IS_LEVEL_1) != IS_LEVEL_1) {
zlog_debug(
"ISIS-Upd (%s): LSP %s invalid LSP is type 0x%x",
circuit->area->area_tag, rawlspid_print(hdr.lsp_id),
hdr.lsp_bits & IS_LEVEL_1_AND_2);
/* continue as per RFC1122 Be liberal in what you accept, and
* conservative in what you send */
}
/* Checksum sanity check - FIXME: move to correct place */
/* 12 = sysid+pdu+remtime */
if (iso_csum_verify(STREAM_DATA(circuit->rcv_stream) + 12,
hdr.pdu_len - 12, hdr.checksum, 12)) {
zlog_debug(
"ISIS-Upd (%s): LSP %s invalid LSP checksum 0x%04hx",
circuit->area->area_tag, rawlspid_print(hdr.lsp_id),
hdr.checksum);
return ISIS_WARNING;
}
/* 7.3.15.1 a) 1 - external domain circuit will discard lsps */
if (circuit->ext_domain) {
zlog_debug(
"ISIS-Upd (%s): LSP %s received at level %d over circuit with externalDomain = true",
circuit->area->area_tag, rawlspid_print(hdr.lsp_id),
level);
return ISIS_WARNING;
}
/* 7.3.15.1 a) 2,3 - manualL2OnlyMode not implemented */
if (!(circuit->is_type & level)) {
zlog_debug(
"ISIS-Upd (%s): LSP %s received at level %d over circuit of type %s",
circuit->area->area_tag, rawlspid_print(hdr.lsp_id),
level, circuit_t2string(circuit->is_type));
return ISIS_WARNING;
}
struct isis_tlvs *tlvs = NULL;
int retval = ISIS_WARNING;
const char *error_log;
if (isis_unpack_tlvs(STREAM_READABLE(circuit->rcv_stream),
circuit->rcv_stream, &tlvs, &error_log)) {
zlog_warn("Something went wrong unpacking the LSP: %s",
error_log);
#ifndef FABRICD
/* send northbound notification. Note that the tlv-type and
* offset cannot correctly be set here as they are not returned
* by isis_unpack_tlvs, but in there I cannot fire a
* notification because I have no circuit information. So until
* we change the code above to return those extra fields, we
* will send dummy values which are ignored in the callback
*/
isis_notif_lsp_error(circuit, rawlspid_print(hdr.lsp_id),
raw_pdu, 0, 0);
#endif /* ifndef FABRICD */
goto out;
}
/* 7.3.15.1 a) 4 - need to make sure IDLength matches */
/* 7.3.15.1 a) 5 - maximum area match, can be ommited since we only use
* 3 */
/* 7.3.15.1 a) 7 - password check */
struct isis_passwd *passwd = (level == ISIS_LEVEL1)
? &circuit->area->area_passwd
: &circuit->area->domain_passwd;
int auth_code = isis_tlvs_auth_is_valid(tlvs, passwd,
circuit->rcv_stream, true);
if (auth_code != ISIS_AUTH_OK) {
isis_event_auth_failure(circuit->area->area_tag,
"LSP authentication failure",
hdr.lsp_id);
#ifndef FABRICD
/* send northbound notification */
if (auth_code == ISIS_AUTH_FAILURE) {
circuit->auth_failures++;
isis_notif_authentication_failure(circuit, raw_pdu);
} else { /* AUTH_TYPE_FAILURE or NO_VALIDATOR */
circuit->auth_type_failures++;
isis_notif_authentication_type_failure(circuit,
raw_pdu);
}
#endif /* ifndef FABRICD */
goto out;
}
/* Find the LSP in our database and compare it to this Link State header
*/
struct isis_lsp *lsp =
lsp_search(&circuit->area->lspdb[level - 1], hdr.lsp_id);
int comp = 0;
if (lsp)
comp = lsp_compare(circuit->area->area_tag, lsp, hdr.seqno,
hdr.checksum, hdr.rem_lifetime);
if (lsp && (lsp->own_lsp))
goto dontcheckadj;
/* 7.3.15.1 a) 6 - Must check that we have an adjacency of the same
* level */
/* for broadcast circuits, snpa should be compared */
if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
if (!isis_adj_lookup_snpa(ssnpa,
circuit->u.bc.adjdb[level - 1])) {
zlog_debug("(%s): DS ======= LSP %s, seq 0x%08x, cksum 0x%04hx, lifetime %hus on %s",
circuit->area->area_tag,
rawlspid_print(hdr.lsp_id), hdr.seqno,
hdr.checksum, hdr.rem_lifetime,
circuit->interface->name);
goto out; /* Silently discard */
}
}
/* for non broadcast, we just need to find same level adj */
else {
/* If no adj, or no sharing of level */
if (!circuit->u.p2p.neighbor) {
retval = ISIS_OK;
goto out;
} else {
if (((level == IS_LEVEL_1)
&& (circuit->u.p2p.neighbor->adj_usage
== ISIS_ADJ_LEVEL2))
|| ((level == IS_LEVEL_2)
&& (circuit->u.p2p.neighbor->adj_usage
== ISIS_ADJ_LEVEL1)))
goto out;
}
}
bool lsp_confusion;
dontcheckadj:
/* 7.3.15.1 a) 7 - Passwords for level 1 - not implemented */
/* 7.3.15.1 a) 8 - Passwords for level 2 - not implemented */
/* 7.3.15.1 a) 9 - OriginatingLSPBufferSize - not implemented FIXME: do
* it */
/* 7.3.16.2 - If this is an LSP from another IS with identical seq_num
* but
* wrong checksum, initiate a purge. */
if (lsp && (lsp->hdr.seqno == hdr.seqno)
&& (lsp->hdr.checksum != hdr.checksum)
&& hdr.rem_lifetime) {
zlog_warn("ISIS-Upd (%s): LSP %s seq 0x%08x with confused checksum received.",
circuit->area->area_tag, rawlspid_print(hdr.lsp_id),
hdr.seqno);
hdr.rem_lifetime = 0;
lsp_confusion = true;
} else
lsp_confusion = false;
/* 7.3.15.1 b) - If the remaining life time is 0, we perform 7.3.16.4 */
if (hdr.rem_lifetime == 0) {
if (!lsp) {
/* 7.3.16.4 a) 1) No LSP in db -> send an ack, but don't
* save */
/* only needed on explicit update, eg - p2p */
if (circuit->circ_type == CIRCUIT_T_P2P)
ack_lsp(&hdr, circuit, level);
goto out; /* FIXME: do we need a purge? */
} else {
if (memcmp(hdr.lsp_id, circuit->isis->sysid,
ISIS_SYS_ID_LEN)) {
/* LSP by some other system -> do 7.3.16.4 b) */
/* 7.3.16.4 b) 1) */
if (comp == LSP_NEWER) {
lsp_update(lsp, &hdr, tlvs,
circuit->rcv_stream,
circuit->area, level,
lsp_confusion);
if (lsp_confusion)
isis_free_tlvs(tlvs);
tlvs = NULL;
/* ii */
lsp_flood_or_update(lsp, NULL,
circuit_scoped);
/* v */
ISIS_FLAGS_CLEAR_ALL(
lsp->SSNflags); /* FIXME:
OTHER
than c
*/
/* For the case of lsp confusion, flood
* the purge back to its
* originator so that it can react.
* Otherwise, don't reflood
* through incoming circuit as usual */
if (!lsp_confusion) {
isis_tx_queue_del(
circuit->tx_queue,
lsp);
/* iv */
if (circuit->circ_type
!= CIRCUIT_T_BROADCAST)
ISIS_SET_FLAG(
lsp->SSNflags,
circuit);
}
} /* 7.3.16.4 b) 2) */
else if (comp == LSP_EQUAL) {
/* i */
isis_tx_queue_del(circuit->tx_queue,
lsp);
/* ii */
if (circuit->circ_type
!= CIRCUIT_T_BROADCAST)
ISIS_SET_FLAG(lsp->SSNflags,
circuit);
} /* 7.3.16.4 b) 3) */
else {
isis_tx_queue_add(circuit->tx_queue,
lsp, TX_LSP_NORMAL);
ISIS_CLEAR_FLAG(lsp->SSNflags, circuit);
}
} else if (lsp->hdr.rem_lifetime != 0) {
/* our own LSP -> 7.3.16.4 c) */
if (comp == LSP_NEWER) {
#ifndef FABRICD
if (lsp->hdr.seqno < hdr.seqno) {
/* send northbound
* notification */
isis_notif_seqno_skipped(
circuit,
rawlspid_print(
hdr.lsp_id));
}
#endif /* ifndef FABRICD */
lsp_inc_seqno(lsp, hdr.seqno);
lsp_flood_or_update(lsp, NULL,
circuit_scoped);
} else {
isis_tx_queue_add(circuit->tx_queue,
lsp, TX_LSP_NORMAL);
ISIS_CLEAR_FLAG(lsp->SSNflags, circuit);
}
if (IS_DEBUG_UPDATE_PACKETS)
zlog_debug(
"ISIS-Upd (%s): (1) re-originating LSP %s new seq 0x%08x",
circuit->area->area_tag,
rawlspid_print(hdr.lsp_id),
lsp->hdr.seqno);
} else {
/* our own LSP with 0 remaining life time */
#ifndef FABRICD
/* send northbound notification */
isis_notif_own_lsp_purge(
circuit, rawlspid_print(hdr.lsp_id));
#endif /* ifndef FABRICD */
}
}
goto out;
}
/* 7.3.15.1 c) - If this is our own lsp and we don't have it initiate a
* purge */
if (memcmp(hdr.lsp_id, circuit->isis->sysid, ISIS_SYS_ID_LEN) == 0) {
if (!lsp) {
/* 7.3.16.4: initiate a purge */
lsp_purge_non_exist(level, &hdr, circuit->area);
retval = ISIS_OK;
goto out;
}
/* 7.3.15.1 d) - If this is our own lsp and we have it */
/* In 7.3.16.1, If an Intermediate system R somewhere in the
* domain
* has information that the current sequence number for source S
* is
* "greater" than that held by S, ... */
if (comp == LSP_NEWER) {
/* 7.3.16.1 */
lsp_inc_seqno(lsp, hdr.seqno);
#ifndef FABRICD
/* send northbound notification */
isis_notif_seqno_skipped(circuit,
rawlspid_print(hdr.lsp_id));
#endif /* ifndef FABRICD */
if (IS_DEBUG_UPDATE_PACKETS) {
zlog_debug(
"ISIS-Upd (%s): (2) re-originating LSP %s new seq 0x%08x",
circuit->area->area_tag,
rawlspid_print(hdr.lsp_id),
lsp->hdr.seqno);
}
lsp_flood(lsp, NULL);
} else if (comp == LSP_EQUAL) {
isis_tx_queue_del(circuit->tx_queue, lsp);
if (circuit->circ_type != CIRCUIT_T_BROADCAST)
ISIS_SET_FLAG(lsp->SSNflags, circuit);
} else {
isis_tx_queue_add(circuit->tx_queue, lsp,
TX_LSP_NORMAL);
ISIS_CLEAR_FLAG(lsp->SSNflags, circuit);
}
} else {
/* 7.3.15.1 e) - This lsp originated on another system */
/* 7.3.15.1 e) 1) LSP newer than the one in db or no LSP in db
*/
if ((!lsp || comp == LSP_NEWER)) {
/*
* If this lsp is a frag, need to see if we have zero
* lsp present
*/
struct isis_lsp *lsp0 = NULL;
if (LSP_FRAGMENT(hdr.lsp_id) != 0) {
uint8_t lspid[ISIS_SYS_ID_LEN + 2];
memcpy(lspid, hdr.lsp_id, ISIS_SYS_ID_LEN + 1);
LSP_FRAGMENT(lspid) = 0;
lsp0 = lsp_search(
&circuit->area->lspdb[level - 1], lspid);
if (!lsp0) {
zlog_debug(
"Got lsp frag, while zero lsp not in database");
goto out;
}
}
/* i */
if (!lsp) {
lsp = lsp_new_from_recv(
&hdr, tlvs, circuit->rcv_stream, lsp0,
circuit->area, level);
tlvs = NULL;
lsp_insert(&circuit->area->lspdb[level - 1],
lsp);
} else /* exists, so we overwrite */
{
lsp_update(lsp, &hdr, tlvs, circuit->rcv_stream,
circuit->area, level, false);
tlvs = NULL;
}
lsp_flood_or_update(lsp, circuit, circuit_scoped);
/* iv */
if (circuit->circ_type != CIRCUIT_T_BROADCAST)
ISIS_SET_FLAG(lsp->SSNflags, circuit);
/* FIXME: v) */
}
/* 7.3.15.1 e) 2) LSP equal to the one in db */
else if (comp == LSP_EQUAL) {
isis_tx_queue_del(circuit->tx_queue, lsp);
lsp_update(lsp, &hdr, tlvs, circuit->rcv_stream,
circuit->area, level, false);
tlvs = NULL;
if (circuit->circ_type != CIRCUIT_T_BROADCAST)
ISIS_SET_FLAG(lsp->SSNflags, circuit);
}
/* 7.3.15.1 e) 3) LSP older than the one in db */
else {
isis_tx_queue_add(circuit->tx_queue, lsp,
TX_LSP_NORMAL);
ISIS_CLEAR_FLAG(lsp->SSNflags, circuit);
}
}
retval = ISIS_OK;
out:
fabricd_trigger_csnp(circuit->area, circuit_scoped);
isis_free_tlvs(tlvs);
return retval;
}
/*
* Process Sequence Numbers
* ISO - 10589
* Section 7.3.15.2 - Action on receipt of a sequence numbers PDU
*/
static int process_snp(uint8_t pdu_type, struct isis_circuit *circuit,
const uint8_t *ssnpa)
{
#ifndef FABRICD
size_t pdu_start = stream_get_getp(circuit->rcv_stream);
size_t pdu_end = stream_get_endp(circuit->rcv_stream);
char raw_pdu[pdu_end - pdu_start];
#endif /* ifndef FABRICD */
bool is_csnp = (pdu_type == L1_COMPLETE_SEQ_NUM
|| pdu_type == L2_COMPLETE_SEQ_NUM);
char typechar = is_csnp ? 'C' : 'P';
int level = (pdu_type == L1_COMPLETE_SEQ_NUM
|| pdu_type == L1_PARTIAL_SEQ_NUM)
? ISIS_LEVEL1
: ISIS_LEVEL2;
uint16_t pdu_len = stream_getw(circuit->rcv_stream);
uint8_t rem_sys_id[ISIS_SYS_ID_LEN];
stream_get(rem_sys_id, circuit->rcv_stream, ISIS_SYS_ID_LEN);
stream_forward_getp(circuit->rcv_stream, 1); /* Circuit ID - unused */
uint8_t start_lsp_id[ISIS_SYS_ID_LEN + 2] = {};
uint8_t stop_lsp_id[ISIS_SYS_ID_LEN + 2] = {};
if (is_csnp) {
stream_get(start_lsp_id, circuit->rcv_stream,
ISIS_SYS_ID_LEN + 2);
stream_get(stop_lsp_id, circuit->rcv_stream,
ISIS_SYS_ID_LEN + 2);
}
if (pdu_len_validate(pdu_len, circuit)) {
zlog_warn("Received a CSNP with bogus length %d", pdu_len);
return ISIS_WARNING;
}
if (IS_DEBUG_SNP_PACKETS) {
zlog_debug(
"ISIS-Snp (%s): Rcvd L%d %cSNP on %s, cirType %s, cirID %u",
circuit->area->area_tag, level, typechar,
circuit->interface->name,
circuit_t2string(circuit->is_type),
circuit->circuit_id);
if (IS_DEBUG_PACKET_DUMP)
zlog_dump_data(STREAM_DATA(circuit->rcv_stream),
stream_get_endp(circuit->rcv_stream));
}
/* 7.3.15.2 a) 1 - external domain circuit will discard snp pdu */
if (circuit->ext_domain) {
zlog_debug(
"ISIS-Snp (%s): Rcvd L%d %cSNP on %s, skipping: circuit externalDomain = true",
circuit->area->area_tag, level, typechar,
circuit->interface->name);
return ISIS_OK;
}
/* 7.3.15.2 a) 2,3 - manualL2OnlyMode not implemented */
if (!(circuit->is_type & level)) {
zlog_debug(
"ISIS-Snp (%s): Rcvd L%d %cSNP on %s, skipping: circuit type %s does not match level %d",
circuit->area->area_tag, level, typechar,
circuit->interface->name,
circuit_t2string(circuit->is_type), level);
return ISIS_OK;
}
/* 7.3.15.2 a) 4 - not applicable for CSNP only PSNPs on broadcast */
if (!is_csnp && (circuit->circ_type == CIRCUIT_T_BROADCAST)
&& !circuit->u.bc.is_dr[level - 1]) {
zlog_debug(
"ISIS-Snp (%s): Rcvd L%d %cSNP from %s on %s, skipping: we are not the DIS",
circuit->area->area_tag, level, typechar,
snpa_print(ssnpa), circuit->interface->name);
return ISIS_OK;
}
/* 7.3.15.2 a) 5 - need to make sure IDLength matches - already checked
*/
/* 7.3.15.2 a) 6 - maximum area match, can be ommited since we only use
* 3
* - already checked */
/* 7.3.15.2 a) 7 - Must check that we have an adjacency of the same
* level */
/* for broadcast circuits, snpa should be compared */
/* FIXME : Do we need to check SNPA? */
if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
if (!isis_adj_lookup(rem_sys_id,
circuit->u.bc.adjdb[level - 1]))
return ISIS_OK; /* Silently discard */
} else {
if (!fabricd && !circuit->u.p2p.neighbor) {
zlog_warn("no p2p neighbor on circuit %s",
circuit->interface->name);
return ISIS_OK; /* Silently discard */
}
}
struct isis_tlvs *tlvs;
int retval = ISIS_WARNING;
const char *error_log;
if (isis_unpack_tlvs(STREAM_READABLE(circuit->rcv_stream),
circuit->rcv_stream, &tlvs, &error_log)) {
zlog_warn("Something went wrong unpacking the SNP: %s",
error_log);
goto out;
}
struct isis_passwd *passwd = (level == IS_LEVEL_1)
? &circuit->area->area_passwd
: &circuit->area->domain_passwd;
if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_RECV)) {
int auth_code = isis_tlvs_auth_is_valid(
tlvs, passwd, circuit->rcv_stream, false);
if (auth_code != ISIS_AUTH_OK) {
isis_event_auth_failure(circuit->area->area_tag,
"SNP authentication failure",
rem_sys_id);
#ifndef FABRICD
/* send northbound notification */
stream_get_from(raw_pdu, circuit->rcv_stream, pdu_start,
pdu_end - pdu_start);
if (auth_code == ISIS_AUTH_FAILURE) {
circuit->auth_failures++;
isis_notif_authentication_failure(circuit,
raw_pdu);
} else { /* AUTH_TYPE_FAILURE or NO_VALIDATOR */
circuit->auth_type_failures++;
isis_notif_authentication_type_failure(circuit,
raw_pdu);
}
#endif /* ifndef FABRICD */
goto out;
}
}
struct isis_lsp_entry *entry_head =
(struct isis_lsp_entry *)tlvs->lsp_entries.head;
/* debug isis snp-packets */
if (IS_DEBUG_SNP_PACKETS) {
zlog_debug("ISIS-Snp (%s): Rcvd L%d %cSNP from %s on %s",
circuit->area->area_tag, level, typechar,
snpa_print(ssnpa), circuit->interface->name);
for (struct isis_lsp_entry *entry = entry_head; entry;
entry = entry->next) {
zlog_debug(
"ISIS-Snp (%s): %cSNP entry %s, seq 0x%08x, cksum 0x%04hx, lifetime %hus",
circuit->area->area_tag, typechar,
rawlspid_print(entry->id), entry->seqno,
entry->checksum, entry->rem_lifetime);
}
}
bool resync_needed = false;
/* 7.3.15.2 b) Actions on LSP_ENTRIES reported */
for (struct isis_lsp_entry *entry = entry_head; entry;
entry = entry->next) {
struct isis_lsp *lsp =
lsp_search(&circuit->area->lspdb[level - 1], entry->id);
bool own_lsp = !memcmp(entry->id, circuit->isis->sysid,
ISIS_SYS_ID_LEN);
if (lsp) {
/* 7.3.15.2 b) 1) is this LSP newer */
int cmp = lsp_compare(circuit->area->area_tag, lsp,
entry->seqno, entry->checksum,
entry->rem_lifetime);
/* 7.3.15.2 b) 2) if it equals, clear SRM on p2p */
if (cmp == LSP_EQUAL) {
/* if (circuit->circ_type !=
* CIRCUIT_T_BROADCAST) */
isis_tx_queue_del(circuit->tx_queue, lsp);
}
/* 7.3.15.2 b) 3) if it is older, clear SSN and set SRM
*/
else if (cmp == LSP_OLDER) {
ISIS_CLEAR_FLAG(lsp->SSNflags, circuit);
isis_tx_queue_add(circuit->tx_queue, lsp,
TX_LSP_NORMAL);
}
/* 7.3.15.2 b) 4) if it is newer, set SSN and clear SRM
on p2p */
else {
if (own_lsp) {
lsp_inc_seqno(lsp, entry->seqno);
isis_tx_queue_add(circuit->tx_queue, lsp,
TX_LSP_NORMAL);
} else {
ISIS_SET_FLAG(lsp->SSNflags, circuit);
/* if (circuit->circ_type !=
* CIRCUIT_T_BROADCAST) */
isis_tx_queue_del(circuit->tx_queue, lsp);
resync_needed = true;
}
}
} else {
/* 7.3.15.2 b) 5) if it was not found, and all of those
* are not 0,
* insert it and set SSN on it */
if (entry->rem_lifetime && entry->checksum
&& entry->seqno
&& memcmp(entry->id, circuit->isis->sysid,
ISIS_SYS_ID_LEN)) {
struct isis_lsp *lsp0 = NULL;
if (LSP_FRAGMENT(entry->id)) {
uint8_t lspid[ISIS_SYS_ID_LEN + 2];
memcpy(lspid, entry->id,
ISIS_SYS_ID_LEN + 1);
LSP_FRAGMENT(lspid) = 0;
lsp0 = lsp_search(
&circuit->area->lspdb[level - 1],
lspid);
if (!lsp0) {
zlog_debug("Got lsp frag in snp, while zero not in database");
continue;
}
}
lsp = lsp_new(circuit->area, entry->id,
entry->rem_lifetime, 0, 0,
entry->checksum, lsp0, level);
lsp_insert(&circuit->area->lspdb[level - 1],
lsp);
lsp_set_all_srmflags(lsp, false);
ISIS_SET_FLAG(lsp->SSNflags, circuit);
resync_needed = true;
}
}
}
/* 7.3.15.2 c) on CSNP set SRM for all in range which were not reported
*/
if (is_csnp) {
/*
* Build a list from our own LSP db bounded with
* start_lsp_id and stop_lsp_id
*/
struct list *lsp_list = list_new();
lsp_build_list_nonzero_ht(&circuit->area->lspdb[level - 1],
start_lsp_id, stop_lsp_id, lsp_list);
/* Fixme: Find a better solution */
struct listnode *node, *nnode;
struct isis_lsp *lsp;
for (struct isis_lsp_entry *entry = entry_head; entry;
entry = entry->next) {
for (ALL_LIST_ELEMENTS(lsp_list, node, nnode, lsp)) {
if (lsp_id_cmp(lsp->hdr.lsp_id, entry->id)
== 0) {
list_delete_node(lsp_list, node);
break;
}
}
}
/* on remaining LSPs we set SRM (neighbor knew not of) */
for (ALL_LIST_ELEMENTS_RO(lsp_list, node, lsp)) {
isis_tx_queue_add(circuit->tx_queue, lsp, TX_LSP_NORMAL);
resync_needed = true;
}
/* lets free it */
list_delete(&lsp_list);
}
if (fabricd_initial_sync_is_complete(circuit->area) && resync_needed)
zlog_warn("OpenFabric: Needed to resync LSPDB using CSNP!");
retval = ISIS_OK;
out:
isis_free_tlvs(tlvs);
return retval;
}
static int pdu_size(uint8_t pdu_type, uint8_t *size)
{
switch (pdu_type) {
case L1_LAN_HELLO:
case L2_LAN_HELLO:
*size = ISIS_LANHELLO_HDRLEN;
break;
case P2P_HELLO:
*size = ISIS_P2PHELLO_HDRLEN;
break;
case L1_LINK_STATE:
case L2_LINK_STATE:
case FS_LINK_STATE:
*size = ISIS_LSP_HDR_LEN;
break;
case L1_COMPLETE_SEQ_NUM:
case L2_COMPLETE_SEQ_NUM:
*size = ISIS_CSNP_HDRLEN;
break;
case L1_PARTIAL_SEQ_NUM:
case L2_PARTIAL_SEQ_NUM:
*size = ISIS_PSNP_HDRLEN;
break;
default:
return 1;
}
*size += ISIS_FIXED_HDR_LEN;
return 0;
}
/*
* PDU Dispatcher
*/
int isis_handle_pdu(struct isis_circuit *circuit, uint8_t *ssnpa)
{
int retval = ISIS_OK;
size_t pdu_start = stream_get_getp(circuit->rcv_stream);
size_t pdu_end = stream_get_endp(circuit->rcv_stream);
char raw_pdu[pdu_end - pdu_start];
stream_get_from(raw_pdu, circuit->rcv_stream, pdu_start,
pdu_end - pdu_start);
/* Verify that at least the 8 bytes fixed header have been received */
if (stream_get_endp(circuit->rcv_stream) < ISIS_FIXED_HDR_LEN) {
flog_err(EC_ISIS_PACKET, "PDU is too short to be IS-IS.");
return ISIS_ERROR;
}
uint8_t idrp = stream_getc(circuit->rcv_stream);
uint8_t length = stream_getc(circuit->rcv_stream);
uint8_t version1 = stream_getc(circuit->rcv_stream);
uint8_t id_len = stream_getc(circuit->rcv_stream);
uint8_t pdu_type = stream_getc(circuit->rcv_stream)
& 0x1f; /* bits 6-8 are reserved */
uint8_t version2 = stream_getc(circuit->rcv_stream);
stream_forward_getp(circuit->rcv_stream, 1); /* reserved */
uint8_t max_area_addrs = stream_getc(circuit->rcv_stream);
pdu_counter_count(circuit->area->pdu_rx_counters, pdu_type);
if (idrp == ISO9542_ESIS) {
flog_err(EC_LIB_DEVELOPMENT,
"No support for ES-IS packet IDRP=%hhx", idrp);
return ISIS_ERROR;
}
if (idrp != ISO10589_ISIS) {
flog_err(EC_ISIS_PACKET, "Not an IS-IS packet IDRP=%hhx",
idrp);
return ISIS_ERROR;
}
if (version1 != 1) {
zlog_warn("Unsupported ISIS version %hhu", version1);
#ifndef FABRICD
/* send northbound notification */
isis_notif_version_skew(circuit, version1, raw_pdu);
#endif /* ifndef FABRICD */
return ISIS_WARNING;
}
if (id_len != 0 && id_len != ISIS_SYS_ID_LEN) {
flog_err(
EC_ISIS_PACKET,
"IDFieldLengthMismatch: ID Length field in a received PDU %hhu, while the parameter for this IS is %u",
id_len, ISIS_SYS_ID_LEN);
circuit->id_len_mismatches++;
#ifndef FABRICD
/* send northbound notification */
isis_notif_id_len_mismatch(circuit, id_len, raw_pdu);
#endif /* ifndef FABRICD */
return ISIS_ERROR;
}
uint8_t expected_length;
if (pdu_size(pdu_type, &expected_length)) {
zlog_warn("Unsupported ISIS PDU %hhu", pdu_type);
return ISIS_WARNING;
}
if (length != expected_length) {
flog_err(EC_ISIS_PACKET,
"Expected fixed header length = %hhu but got %hhu",
expected_length, length);
return ISIS_ERROR;
}
if (stream_get_endp(circuit->rcv_stream) < length) {
flog_err(
EC_ISIS_PACKET,
"PDU is too short to contain fixed header of given PDU type.");
return ISIS_ERROR;
}
if (version2 != 1) {
zlog_warn("Unsupported ISIS PDU version %hhu", version2);
#ifndef FABRICD
/* send northbound notification */
isis_notif_version_skew(circuit, version2, raw_pdu);
#endif /* ifndef FABRICD */
return ISIS_WARNING;
}
if (circuit->is_passive) {
zlog_warn("Received ISIS PDU on passive circuit %s",
circuit->interface->name);
return ISIS_WARNING;
}
/* either 3 or 0 */
if (pdu_type != FS_LINK_STATE /* FS PDU doesn't contain max area addr
field */
&& max_area_addrs != 0
&& max_area_addrs != circuit->isis->max_area_addrs) {
flog_err(
EC_ISIS_PACKET,
"maximumAreaAddressesMismatch: maximumAreaAdresses in a received PDU %hhu while the parameter for this IS is %u",
max_area_addrs, circuit->isis->max_area_addrs);
circuit->max_area_addr_mismatches++;
#ifndef FABRICD
/* send northbound notification */
isis_notif_max_area_addr_mismatch(circuit, max_area_addrs,
raw_pdu);
#endif /* ifndef FABRICD */
return ISIS_ERROR;
}
switch (pdu_type) {
case L1_LAN_HELLO:
case L2_LAN_HELLO:
case P2P_HELLO:
if (fabricd && pdu_type != P2P_HELLO)
return ISIS_ERROR;
retval = process_hello(pdu_type, circuit, ssnpa);
break;
case L1_LINK_STATE:
case L2_LINK_STATE:
case FS_LINK_STATE:
if (fabricd
&& pdu_type != L2_LINK_STATE
&& pdu_type != FS_LINK_STATE)
return ISIS_ERROR;
retval = process_lsp(pdu_type, circuit, ssnpa, max_area_addrs);
break;
case L1_COMPLETE_SEQ_NUM:
case L2_COMPLETE_SEQ_NUM:
case L1_PARTIAL_SEQ_NUM:
case L2_PARTIAL_SEQ_NUM:
retval = process_snp(pdu_type, circuit, ssnpa);
break;
default:
return ISIS_ERROR;
}
return retval;
}
int isis_receive(struct thread *thread)
{
struct isis_circuit *circuit;
uint8_t ssnpa[ETH_ALEN];
int retval;
/*
* Get the circuit
*/
circuit = THREAD_ARG(thread);
assert(circuit);
circuit->t_read = NULL;
isis_circuit_stream(circuit, &circuit->rcv_stream);
retval = circuit->rx(circuit, ssnpa);
#if ISIS_METHOD != ISIS_METHOD_BPF
if (retval == ISIS_OK)
retval = isis_handle_pdu(circuit, ssnpa);
#endif //ISIS_METHOD != ISIS_METHOD_BPF
/*
* prepare for next packet.
*/
if (!circuit->is_passive)
isis_circuit_prepare(circuit);
return retval;
}
/*
* SEND SIDE
*/
void fill_fixed_hdr(uint8_t pdu_type, struct stream *stream)
{
uint8_t length;
if (pdu_size(pdu_type, &length))
assert(!"Unknown PDU Type");
stream_putc(stream, ISO10589_ISIS); /* IDRP */
stream_putc(stream, length); /* Length of fixed header */
stream_putc(stream, 1); /* Version/Protocol ID Extension 1 */
stream_putc(stream, 0); /* ID Length, 0 => 6 */
stream_putc(stream, pdu_type);
stream_putc(stream, 1); /* Subversion */
stream_putc(stream, 0); /* Reserved */
stream_putc(stream, 0); /* Max Area Addresses 0 => 3 */
}
static uint8_t hello_pdu_type(struct isis_circuit *circuit, int level)
{
if (circuit->circ_type == CIRCUIT_T_BROADCAST)
return (level == IS_LEVEL_1) ? L1_LAN_HELLO : L2_LAN_HELLO;
else
return P2P_HELLO;
}
static void put_hello_hdr(struct isis_circuit *circuit, int level,
size_t *len_pointer)
{
uint8_t pdu_type = hello_pdu_type(circuit, level);
isis_circuit_stream(circuit, &circuit->snd_stream);
fill_fixed_hdr(pdu_type, circuit->snd_stream);
stream_putc(circuit->snd_stream, circuit->is_type);
stream_put(circuit->snd_stream, circuit->isis->sysid, ISIS_SYS_ID_LEN);
uint32_t holdtime = circuit->hello_multiplier[level - 1]
* circuit->hello_interval[level - 1];
if (holdtime > 0xffff)
holdtime = 0xffff;
stream_putw(circuit->snd_stream, holdtime);
*len_pointer = stream_get_endp(circuit->snd_stream);
stream_putw(circuit->snd_stream, 0); /* length is filled in later */
if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
uint8_t *desig_is = (level == IS_LEVEL_1)
? circuit->u.bc.l1_desig_is
: circuit->u.bc.l2_desig_is;
stream_putc(circuit->snd_stream, circuit->priority[level - 1]);
stream_put(circuit->snd_stream, desig_is, ISIS_SYS_ID_LEN + 1);
} else {
stream_putc(circuit->snd_stream, circuit->circuit_id);
}
}
int send_hello(struct isis_circuit *circuit, int level)
{
size_t len_pointer;
int retval;
if (circuit->is_passive)
return ISIS_OK;
if (circuit->interface->mtu == 0) {
zlog_warn("circuit has zero MTU");
return ISIS_WARNING;
}
put_hello_hdr(circuit, level, &len_pointer);
struct isis_tlvs *tlvs = isis_alloc_tlvs();
isis_tlvs_add_auth(tlvs, &circuit->passwd);
if (!listcount(circuit->area->area_addrs)) {
isis_free_tlvs(tlvs);
return ISIS_WARNING;
}
isis_tlvs_add_area_addresses(tlvs, circuit->area->area_addrs);
if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
isis_tlvs_add_lan_neighbors(
tlvs, circuit->u.bc.lan_neighs[level - 1]);
} else if (circuit->circ_type == CIRCUIT_T_P2P
&& !circuit->disable_threeway_adj) {
uint32_t ext_circuit_id = circuit->idx;
if (circuit->u.p2p.neighbor) {
uint8_t threeway_state;
if (fabricd_initial_sync_is_in_progress(circuit->area)
&& fabricd_initial_sync_circuit(circuit->area) != circuit)
threeway_state = ISIS_THREEWAY_DOWN;
else
threeway_state = circuit->u.p2p.neighbor->threeway_state;
isis_tlvs_add_threeway_adj(tlvs,
threeway_state,
ext_circuit_id,
circuit->u.p2p.neighbor->sysid,
circuit->u.p2p.neighbor->ext_circuit_id);
} else {
isis_tlvs_add_threeway_adj(tlvs,
ISIS_THREEWAY_DOWN,
ext_circuit_id,
NULL, 0);
}
}
isis_tlvs_set_protocols_supported(tlvs, &circuit->nlpids);
/*
* MT Supported TLV
*
* TLV gets included if no topology is enabled on the interface,
* if one topology other than #0 is enabled, or if multiple topologies
* are enabled.
*/
struct isis_circuit_mt_setting **mt_settings;
unsigned int mt_count;
mt_settings = circuit_mt_settings(circuit, &mt_count);
if (mt_count == 0 && area_is_mt(circuit->area)) {
tlvs->mt_router_info_empty = true;
} else if ((mt_count == 1
&& mt_settings[0]->mtid != ISIS_MT_IPV4_UNICAST)
|| (mt_count > 1)) {
for (unsigned int i = 0; i < mt_count; i++)
isis_tlvs_add_mt_router_info(tlvs, mt_settings[i]->mtid,
false, false);
}
if (circuit->ip_router) {
struct list *circuit_ip_addrs = fabricd_ip_addrs(circuit);
if (circuit_ip_addrs)
isis_tlvs_add_ipv4_addresses(tlvs, circuit_ip_addrs);
}
if (circuit->ipv6_router && circuit->ipv6_link)
isis_tlvs_add_ipv6_addresses(tlvs, circuit->ipv6_link);
if (isis_pack_tlvs(tlvs, circuit->snd_stream, len_pointer,
circuit->pad_hellos, false)) {
isis_free_tlvs(tlvs);
return ISIS_WARNING; /* XXX: Maybe Log TLV structure? */
}
if (IS_DEBUG_ADJ_PACKETS) {
if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
zlog_debug(
"ISIS-Adj (%s): Sending L%d LAN IIH on %s, length %zd",
circuit->area->area_tag, level,
circuit->interface->name,
stream_get_endp(circuit->snd_stream));
} else {
zlog_debug(
"ISIS-Adj (%s): Sending P2P IIH on %s, length %zd",
circuit->area->area_tag,
circuit->interface->name,
stream_get_endp(circuit->snd_stream));
}
if (IS_DEBUG_PACKET_DUMP)
zlog_dump_data(STREAM_DATA(circuit->snd_stream),
stream_get_endp(circuit->snd_stream));
}
isis_free_tlvs(tlvs);
pdu_counter_count(circuit->area->pdu_tx_counters,
hello_pdu_type(circuit, level));
retval = circuit->tx(circuit, level);
if (retval != ISIS_OK)
flog_err(EC_ISIS_PACKET,
"ISIS-Adj (%s): Send L%d IIH on %s failed",
circuit->area->area_tag, level,
circuit->interface->name);
return retval;
}
static int send_hello_cb(struct thread *thread)
{
struct isis_circuit_arg *arg = THREAD_ARG(thread);
assert(arg);
struct isis_circuit *circuit = arg->circuit;
int level = arg->level;
assert(circuit);
if (circuit->circ_type == CIRCUIT_T_P2P) {
circuit->u.p2p.t_send_p2p_hello = NULL;
send_hello(circuit, 1);
send_hello_sched(circuit, ISIS_LEVEL1,
1000 * circuit->hello_interval[1]);
return ISIS_OK;
}
if (circuit->circ_type != CIRCUIT_T_BROADCAST) {
zlog_warn("ISIS-Hello (%s): Trying to send hello on unknown circuit type %d",
circuit->area->area_tag, circuit->circ_type);
return ISIS_WARNING;
}
circuit->u.bc.t_send_lan_hello[level - 1] = NULL;
if (!(circuit->is_type & level)) {
zlog_warn("ISIS-Hello (%s): Trying to send L%d IIH in L%d-only circuit",
circuit->area->area_tag, level, 3 - level);
return ISIS_WARNING;
}
if (circuit->u.bc.run_dr_elect[level - 1])
isis_dr_elect(circuit, level);
int rv = send_hello(circuit, level);
/* set next timer thread */
send_hello_sched(circuit, level, 1000 * circuit->hello_interval[level - 1]);
return rv;
}
static void _send_hello_sched(struct isis_circuit *circuit,
struct thread **threadp,
int level, long delay)
{
if (*threadp) {
if (thread_timer_remain_msec(*threadp) < (unsigned long)delay)
return;
thread_cancel(threadp);
}
thread_add_timer_msec(master, send_hello_cb,
&circuit->level_arg[level - 1],
isis_jitter(delay, IIH_JITTER),
threadp);
}
void send_hello_sched(struct isis_circuit *circuit, int level, long delay)
{
if (circuit->circ_type == CIRCUIT_T_P2P) {
_send_hello_sched(circuit, &circuit->u.p2p.t_send_p2p_hello,
ISIS_LEVEL1, delay);
return;
}
if (circuit->circ_type != CIRCUIT_T_BROADCAST) {
zlog_warn("%s: encountered unknown circuit type %d on %s",
__func__, circuit->circ_type,
circuit->interface->name);
return;
}
for (int loop_level = ISIS_LEVEL1; loop_level <= ISIS_LEVEL2; loop_level++) {
if (!(loop_level & level))
continue;
_send_hello_sched(
circuit,
&circuit->u.bc.t_send_lan_hello[loop_level - 1],
loop_level,
delay
);
}
}
/*
* Count the maximum number of lsps that can be accomodated by a given size.
*/
#define LSP_ENTRIES_LEN (10 + ISIS_SYS_ID_LEN)
static uint16_t get_max_lsp_count(uint16_t size)
{
uint16_t tlv_count;
uint16_t lsp_count;
uint16_t remaining_size;
/* First count the full size TLVs */
tlv_count = size / MAX_LSP_ENTRIES_TLV_SIZE;
lsp_count = tlv_count * (MAX_LSP_ENTRIES_TLV_SIZE / LSP_ENTRIES_LEN);
/* The last TLV, if any */
remaining_size = size % MAX_LSP_ENTRIES_TLV_SIZE;
if (remaining_size - 2 >= LSP_ENTRIES_LEN)
lsp_count += (remaining_size - 2) / LSP_ENTRIES_LEN;
return lsp_count;
}
int send_csnp(struct isis_circuit *circuit, int level)
{
if (lspdb_count(&circuit->area->lspdb[level - 1]) == 0)
return ISIS_OK;
uint8_t pdu_type = (level == ISIS_LEVEL1) ? L1_COMPLETE_SEQ_NUM
: L2_COMPLETE_SEQ_NUM;
isis_circuit_stream(circuit, &circuit->snd_stream);
fill_fixed_hdr(pdu_type, circuit->snd_stream);
size_t len_pointer = stream_get_endp(circuit->snd_stream);
stream_putw(circuit->snd_stream, 0);
stream_put(circuit->snd_stream, circuit->isis->sysid, ISIS_SYS_ID_LEN);
/* with zero circuit id - ref 9.10, 9.11 */
stream_putc(circuit->snd_stream, 0);
size_t start_pointer = stream_get_endp(circuit->snd_stream);
stream_put(circuit->snd_stream, 0, ISIS_SYS_ID_LEN + 2);
size_t end_pointer = stream_get_endp(circuit->snd_stream);
stream_put(circuit->snd_stream, 0, ISIS_SYS_ID_LEN + 2);
struct isis_passwd *passwd = (level == ISIS_LEVEL1)
? &circuit->area->area_passwd
: &circuit->area->domain_passwd;
struct isis_tlvs *tlvs = isis_alloc_tlvs();
if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_SEND))
isis_tlvs_add_auth(tlvs, passwd);
size_t tlv_start = stream_get_endp(circuit->snd_stream);
if (isis_pack_tlvs(tlvs, circuit->snd_stream, len_pointer, false,
false)) {
isis_free_tlvs(tlvs);
return ISIS_WARNING;
}
isis_free_tlvs(tlvs);
uint16_t num_lsps =
get_max_lsp_count(STREAM_WRITEABLE(circuit->snd_stream));
uint8_t start[ISIS_SYS_ID_LEN + 2];
memset(start, 0x00, ISIS_SYS_ID_LEN + 2);
uint8_t stop[ISIS_SYS_ID_LEN + 2];
memset(stop, 0xff, ISIS_SYS_ID_LEN + 2);
bool loop = true;
while (loop) {
tlvs = isis_alloc_tlvs();
if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_SEND))
isis_tlvs_add_auth(tlvs, passwd);
struct isis_lsp *last_lsp;
isis_tlvs_add_csnp_entries(tlvs, start, stop, num_lsps,
&circuit->area->lspdb[level - 1],
&last_lsp);
/*
* Update the stop lsp_id before encoding this CSNP.
*/
if (tlvs->lsp_entries.count < num_lsps) {
memset(stop, 0xff, ISIS_SYS_ID_LEN + 2);
} else {
memcpy(stop, last_lsp->hdr.lsp_id, sizeof(stop));
}
memcpy(STREAM_DATA(circuit->snd_stream) + start_pointer, start,
ISIS_SYS_ID_LEN + 2);
memcpy(STREAM_DATA(circuit->snd_stream) + end_pointer, stop,
ISIS_SYS_ID_LEN + 2);
stream_set_endp(circuit->snd_stream, tlv_start);
if (isis_pack_tlvs(tlvs, circuit->snd_stream, len_pointer,
false, false)) {
isis_free_tlvs(tlvs);
return ISIS_WARNING;
}
if (IS_DEBUG_SNP_PACKETS) {
zlog_debug(
"ISIS-Snp (%s): Sending L%d CSNP on %s, length %zd",
circuit->area->area_tag, level,
circuit->interface->name,
stream_get_endp(circuit->snd_stream));
log_multiline(LOG_DEBUG, " ", "%s",
isis_format_tlvs(tlvs));
if (IS_DEBUG_PACKET_DUMP)
zlog_dump_data(
STREAM_DATA(circuit->snd_stream),
stream_get_endp(circuit->snd_stream));
}
pdu_counter_count(circuit->area->pdu_tx_counters, pdu_type);
int retval = circuit->tx(circuit, level);
if (retval != ISIS_OK) {
flog_err(EC_ISIS_PACKET,
"ISIS-Snp (%s): Send L%d CSNP on %s failed",
circuit->area->area_tag, level,
circuit->interface->name);
isis_free_tlvs(tlvs);
return retval;
}
/*
* Start lsp_id of the next CSNP should be one plus the
* stop lsp_id in this current CSNP.
*/
memcpy(start, stop, ISIS_SYS_ID_LEN + 2);
loop = false;
for (int i = ISIS_SYS_ID_LEN + 1; i >= 0; --i) {
if (start[i] < (uint8_t)0xff) {
start[i] += 1;
loop = true;
break;
}
}
memset(stop, 0xff, ISIS_SYS_ID_LEN + 2);
isis_free_tlvs(tlvs);
}
return ISIS_OK;
}
int send_l1_csnp(struct thread *thread)
{
struct isis_circuit *circuit;
circuit = THREAD_ARG(thread);
assert(circuit);
circuit->t_send_csnp[0] = NULL;
if ((circuit->circ_type == CIRCUIT_T_BROADCAST
&& circuit->u.bc.is_dr[0])
|| circuit->circ_type == CIRCUIT_T_P2P) {
send_csnp(circuit, 1);
}
/* set next timer thread */
thread_add_timer(master, send_l1_csnp, circuit,
isis_jitter(circuit->csnp_interval[0], CSNP_JITTER),
&circuit->t_send_csnp[0]);
return ISIS_OK;
}
int send_l2_csnp(struct thread *thread)
{
struct isis_circuit *circuit;
circuit = THREAD_ARG(thread);
assert(circuit);
circuit->t_send_csnp[1] = NULL;
if ((circuit->circ_type == CIRCUIT_T_BROADCAST
&& circuit->u.bc.is_dr[1])
|| circuit->circ_type == CIRCUIT_T_P2P) {
send_csnp(circuit, 2);
}
/* set next timer thread */
thread_add_timer(master, send_l2_csnp, circuit,
isis_jitter(circuit->csnp_interval[1], CSNP_JITTER),
&circuit->t_send_csnp[1]);
return ISIS_OK;
}
/*
* 7.3.15.4 action on expiration of partial SNP interval
* level 1
*/
static int send_psnp(int level, struct isis_circuit *circuit)
{
if (circuit->circ_type == CIRCUIT_T_BROADCAST
&& circuit->u.bc.is_dr[level - 1])
return ISIS_OK;
if (lspdb_count(&circuit->area->lspdb[level - 1]) == 0)
return ISIS_OK;
if (!circuit->snd_stream)
return ISIS_ERROR;
uint8_t pdu_type = (level == ISIS_LEVEL1) ? L1_PARTIAL_SEQ_NUM
: L2_PARTIAL_SEQ_NUM;
isis_circuit_stream(circuit, &circuit->snd_stream);
fill_fixed_hdr(pdu_type, circuit->snd_stream);
size_t len_pointer = stream_get_endp(circuit->snd_stream);
stream_putw(circuit->snd_stream, 0); /* length is filled in later */
stream_put(circuit->snd_stream, circuit->isis->sysid, ISIS_SYS_ID_LEN);
stream_putc(circuit->snd_stream, circuit->idx);
struct isis_passwd *passwd = (level == ISIS_LEVEL1)
? &circuit->area->area_passwd
: &circuit->area->domain_passwd;
struct isis_tlvs *tlvs = isis_alloc_tlvs();
if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_SEND))
isis_tlvs_add_auth(tlvs, passwd);
size_t tlv_start = stream_get_endp(circuit->snd_stream);
if (isis_pack_tlvs(tlvs, circuit->snd_stream, len_pointer, false,
false)) {
isis_free_tlvs(tlvs);
return ISIS_WARNING;
}
isis_free_tlvs(tlvs);
uint16_t num_lsps =
get_max_lsp_count(STREAM_WRITEABLE(circuit->snd_stream));
while (1) {
struct isis_lsp *lsp;
tlvs = isis_alloc_tlvs();
if (CHECK_FLAG(passwd->snp_auth, SNP_AUTH_SEND))
isis_tlvs_add_auth(tlvs, passwd);
frr_each (lspdb, &circuit->area->lspdb[level - 1], lsp) {
if (ISIS_CHECK_FLAG(lsp->SSNflags, circuit))
isis_tlvs_add_lsp_entry(tlvs, lsp);
if (tlvs->lsp_entries.count == num_lsps)
break;
}
if (!tlvs->lsp_entries.count) {
isis_free_tlvs(tlvs);
return ISIS_OK;
}
stream_set_endp(circuit->snd_stream, tlv_start);
if (isis_pack_tlvs(tlvs, circuit->snd_stream, len_pointer,
false, false)) {
isis_free_tlvs(tlvs);
return ISIS_WARNING;
}
if (IS_DEBUG_SNP_PACKETS) {
zlog_debug(
"ISIS-Snp (%s): Sending L%d PSNP on %s, length %zd",
circuit->area->area_tag, level,
circuit->interface->name,
stream_get_endp(circuit->snd_stream));
log_multiline(LOG_DEBUG, " ", "%s",
isis_format_tlvs(tlvs));
if (IS_DEBUG_PACKET_DUMP)
zlog_dump_data(
STREAM_DATA(circuit->snd_stream),
stream_get_endp(circuit->snd_stream));
}
pdu_counter_count(circuit->area->pdu_tx_counters, pdu_type);
int retval = circuit->tx(circuit, level);
if (retval != ISIS_OK) {
flog_err(EC_ISIS_PACKET,
"ISIS-Snp (%s): Send L%d PSNP on %s failed",
circuit->area->area_tag, level,
circuit->interface->name);
isis_free_tlvs(tlvs);
return retval;
}
/*
* sending succeeded, we can clear SSN flags of this circuit
* for the LSPs in list
*/
struct isis_lsp_entry *entry_head;
entry_head = (struct isis_lsp_entry *)tlvs->lsp_entries.head;
for (struct isis_lsp_entry *entry = entry_head; entry;
entry = entry->next)
ISIS_CLEAR_FLAG(entry->lsp->SSNflags, circuit);
isis_free_tlvs(tlvs);
}
return ISIS_OK;
}
int send_l1_psnp(struct thread *thread)
{
struct isis_circuit *circuit;
circuit = THREAD_ARG(thread);
assert(circuit);
circuit->t_send_psnp[0] = NULL;
send_psnp(1, circuit);
/* set next timer thread */
thread_add_timer(master, send_l1_psnp, circuit,
isis_jitter(circuit->psnp_interval[0], PSNP_JITTER),
&circuit->t_send_psnp[0]);
return ISIS_OK;
}
/*
* 7.3.15.4 action on expiration of partial SNP interval
* level 2
*/
int send_l2_psnp(struct thread *thread)
{
struct isis_circuit *circuit;
circuit = THREAD_ARG(thread);
assert(circuit);
circuit->t_send_psnp[1] = NULL;
send_psnp(2, circuit);
/* set next timer thread */
thread_add_timer(master, send_l2_psnp, circuit,
isis_jitter(circuit->psnp_interval[1], PSNP_JITTER),
&circuit->t_send_psnp[1]);
return ISIS_OK;
}
/*
* ISO 10589 - 7.3.14.3
*/
void send_lsp(struct isis_circuit *circuit, struct isis_lsp *lsp,
enum isis_tx_type tx_type)
{
int clear_srm = 1;
int retval = ISIS_OK;
if (circuit->state != C_STATE_UP || circuit->is_passive == 1)
goto out;
/*
* Do not send if levels do not match
*/
if (!(lsp->level & circuit->is_type))
goto out;
/*
* Do not send if we do not have adjacencies in state up on the circuit
*/
if (circuit->upadjcount[lsp->level - 1] == 0)
goto out;
/* stream_copy will assert and stop program execution if LSP is larger
* than
* the circuit's MTU. So handle and log this case here. */
if (stream_get_endp(lsp->pdu) > stream_get_size(circuit->snd_stream)) {
flog_err(
EC_ISIS_PACKET,
"ISIS-Upd (%s): Can't send L%d LSP %s, seq 0x%08x, cksum 0x%04hx, lifetime %hus on %s. LSP Size is %zu while interface stream size is %zu.",
circuit->area->area_tag, lsp->level,
rawlspid_print(lsp->hdr.lsp_id), lsp->hdr.seqno,
lsp->hdr.checksum, lsp->hdr.rem_lifetime,
circuit->interface->name, stream_get_endp(lsp->pdu),
stream_get_size(circuit->snd_stream));
#ifndef FABRICD
/* send a northbound notification */
isis_notif_lsp_too_large(circuit, stream_get_endp(lsp->pdu),
rawlspid_print(lsp->hdr.lsp_id));
#endif /* ifndef FABRICD */
if (IS_DEBUG_PACKET_DUMP)
zlog_dump_data(STREAM_DATA(lsp->pdu),
stream_get_endp(lsp->pdu));
retval = ISIS_ERROR;
goto out;
}
/* copy our lsp to the send buffer */
stream_copy(circuit->snd_stream, lsp->pdu);
if (tx_type == TX_LSP_CIRCUIT_SCOPED) {
stream_putc_at(circuit->snd_stream, 4, FS_LINK_STATE);
stream_putc_at(circuit->snd_stream, 7,
L2_CIRCUIT_FLOODING_SCOPE);
}
if (IS_DEBUG_UPDATE_PACKETS) {
zlog_debug("ISIS-Upd (%s): Sending %sL%d LSP %s, seq 0x%08x, cksum 0x%04hx, lifetime %hus on %s",
circuit->area->area_tag,
(tx_type == TX_LSP_CIRCUIT_SCOPED)
? "Circuit scoped " : "",
lsp->level,
rawlspid_print(lsp->hdr.lsp_id), lsp->hdr.seqno,
lsp->hdr.checksum, lsp->hdr.rem_lifetime,
circuit->interface->name);
if (IS_DEBUG_PACKET_DUMP)
zlog_dump_data(STREAM_DATA(circuit->snd_stream),
stream_get_endp(circuit->snd_stream));
}
uint8_t pdu_type = (tx_type == TX_LSP_CIRCUIT_SCOPED) ? FS_LINK_STATE
: (lsp->level == ISIS_LEVEL1) ? L1_LINK_STATE
: L2_LINK_STATE;
clear_srm = 0;
pdu_counter_count(circuit->area->pdu_tx_counters, pdu_type);
retval = circuit->tx(circuit, lsp->level);
if (retval != ISIS_OK) {
flog_err(EC_ISIS_PACKET,
"ISIS-Upd (%s): Send L%d LSP on %s failed %s",
circuit->area->area_tag, lsp->level,
circuit->interface->name,
(retval == ISIS_WARNING) ? "temporarily"
: "permanently");
}
out:
if (clear_srm
|| (retval == ISIS_OK && circuit->circ_type == CIRCUIT_T_BROADCAST)
|| (retval != ISIS_OK && retval != ISIS_WARNING)) {
/* SRM flag will trigger retransmission. We will not retransmit
* if we
* encountered a fatal error.
* On success, they should only be cleared if it's a broadcast
* circuit.
* On a P2P circuit, we will wait for the ack from the neighbor
* to clear
* the fag.
*/
isis_tx_queue_del(circuit->tx_queue, lsp);
}
}
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