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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-09 13:16:35 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-09 13:16:35 +0000
commite2bbf175a2184bd76f6c54ccf8456babeb1a46fc (patch)
treef0b76550d6e6f500ada964a3a4ee933a45e5a6f1 /isisd/isis_pdu.c
parentInitial commit. (diff)
downloadfrr-e2bbf175a2184bd76f6c54ccf8456babeb1a46fc.tar.xz
frr-e2bbf175a2184bd76f6c54ccf8456babeb1a46fc.zip
Adding upstream version 9.1.upstream/9.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'isisd/isis_pdu.c')
-rw-r--r--isisd/isis_pdu.c2585
1 files changed, 2585 insertions, 0 deletions
diff --git a/isisd/isis_pdu.c b/isisd/isis_pdu.c
new file mode 100644
index 0000000..0cd43a7
--- /dev/null
+++ b/isisd/isis_pdu.c
@@ -0,0 +1,2585 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * 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
+ */
+
+#include <zebra.h>
+
+#include "memory.h"
+#include "frrevent.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");
+ 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 */
+ EVENT_OFF(adj->t_expire);
+ event_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)) {
+ event_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 */
+ EVENT_OFF(adj->t_expire);
+ event_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 %pSY on %s, cirType %s, cirID %u, length %zd",
+ iih->circuit->area->area_tag, iih->level, 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 void update_rej_adj_count(struct isis_circuit *circuit)
+{
+ circuit->rej_adjacencies++;
+ if (circuit->is_type == IS_LEVEL_1)
+ circuit->area->rej_adjacencies[0]++;
+ else if (circuit->is_type == IS_LEVEL_2)
+ circuit->area->rej_adjacencies[1]++;
+ else {
+ circuit->area->rej_adjacencies[0]++;
+ circuit->area->rej_adjacencies[1]++;
+ }
+}
+
+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");
+ update_rej_adj_count(circuit);
+#ifndef FABRICD
+ isis_notif_reject_adjacency(
+ circuit, "p2p hello on non p2p circuit",
+ raw_pdu, sizeof(raw_pdu));
+#endif /* ifndef FABRICD */
+ return ISIS_WARNING;
+ }
+ } else {
+ if (circuit->circ_type != CIRCUIT_T_BROADCAST) {
+ zlog_warn("lan hello on non broadcast circuit");
+ update_rej_adj_count(circuit);
+#ifndef FABRICD
+ isis_notif_reject_adjacency(
+ circuit, "lan hello on non broadcast circuit",
+ raw_pdu, sizeof(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);
+ update_rej_adj_count(circuit);
+#ifndef FABRICD
+ isis_notif_reject_adjacency(
+ circuit,
+ "LAN Hello received over circuit with externalDomain = true",
+ raw_pdu, sizeof(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);
+ }
+ update_rej_adj_count(circuit);
+#ifndef FABRICD
+ isis_notif_reject_adjacency(circuit,
+ "Interface level mismatch",
+ raw_pdu, sizeof(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);
+ update_rej_adj_count(circuit);
+#ifndef FABRICD
+ isis_notif_reject_adjacency(circuit, "Invalid PDU length",
+ raw_pdu, sizeof(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);
+ update_rej_adj_count(circuit);
+#ifndef FABRICD
+ isis_notif_reject_adjacency(circuit,
+ "LAN Hello with wrong IS-level",
+ raw_pdu, sizeof(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);
+ update_rej_adj_count(circuit);
+#ifndef FABRICD
+ isis_notif_reject_adjacency(circuit, "Failed to unpack TLVs",
+ raw_pdu, sizeof(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, sizeof(raw_pdu));
+#endif /* ifndef FABRICD */
+ goto out;
+ }
+
+ if (!iih.tlvs->protocols_supported.count) {
+ zlog_warn("No supported protocols TLV in %s", pdu_name);
+ update_rej_adj_count(circuit);
+#ifndef FABRICD
+ isis_notif_reject_adjacency(circuit,
+ "No supported protocols TLV",
+ raw_pdu, sizeof(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) {
+ update_rej_adj_count(circuit);
+ isis_notif_authentication_failure(circuit, raw_pdu,
+ sizeof(raw_pdu));
+ } else { /* AUTH_TYPE_FAILURE or NO_VALIDATOR */
+ update_rej_adj_count(circuit);
+ isis_notif_authentication_type_failure(circuit, raw_pdu,
+ sizeof(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);
+ update_rej_adj_count(circuit);
+#ifndef FABRICD
+ isis_notif_reject_adjacency(circuit,
+ "Received IIH with our own sysid",
+ raw_pdu, sizeof(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, sizeof(raw_pdu));
+#endif /* ifndef FABRICD */
+ goto out;
+ }
+
+ iih.v4_usable = (fabricd_ip_addrs(circuit)
+ && iih.tlvs->ipv4_address.count);
+
+ iih.v6_usable =
+ (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);
+ }
+ update_rej_adj_count(circuit);
+#ifndef FABRICD
+ isis_notif_reject_adjacency(
+ circuit, "Neither IPv4 not IPv6 considered usable",
+ raw_pdu, sizeof(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 */
+ char buf[ISO_SYSID_STRLEN];
+
+ snprintfrr(buf, ISO_SYSID_STRLEN, "%pSY", hdr.lsp_id);
+ isis_notif_lsp_received(circuit, hdr.lsp_id, hdr.seqno, time(NULL),
+ buf);
+#endif /* ifndef FABRICD */
+
+ if (pdu_len_validate(hdr.pdu_len, circuit)) {
+ zlog_debug("ISIS-Upd (%s): LSP %pLS invalid LSP length %hu",
+ circuit->area->area_tag, hdr.lsp_id, hdr.pdu_len);
+ return ISIS_WARNING;
+ }
+
+ if (IS_DEBUG_UPDATE_PACKETS) {
+ zlog_debug(
+ "ISIS-Upd (%s): Rcvd L%d LSP %pLS, seq 0x%08x, cksum 0x%04hx, lifetime %hus, len %hu, on %s",
+ circuit->area->area_tag, level, 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 %pLS invalid LSP is type 0x%x",
+ circuit->area->area_tag, 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 %pLS invalid LSP checksum 0x%04hx",
+ circuit->area->area_tag, 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 %pLS received at level %d over circuit with externalDomain = true",
+ circuit->area->area_tag, 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 %pLS received at level %d over circuit of type %s",
+ circuit->area->area_tag, 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
+ */
+ circuit->lsp_error_counter++;
+ if (circuit->is_type == IS_LEVEL_1) {
+ circuit->area->lsp_error_counter[0]++;
+ } else if (circuit->is_type == IS_LEVEL_2) {
+ circuit->area->lsp_error_counter[1]++;
+ } else {
+ circuit->area->lsp_error_counter[0]++;
+ circuit->area->lsp_error_counter[1]++;
+ }
+
+ isis_notif_lsp_error(circuit, hdr.lsp_id, raw_pdu,
+ sizeof(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++;
+ if (circuit->is_type == IS_LEVEL_1) {
+ circuit->area->auth_failures[0]++;
+ } else if (circuit->is_type == IS_LEVEL_2) {
+ circuit->area->auth_failures[1]++;
+ } else {
+ circuit->area->auth_failures[0]++;
+ circuit->area->auth_failures[1]++;
+ }
+ isis_notif_authentication_failure(circuit, raw_pdu,
+ sizeof(raw_pdu));
+ } else { /* AUTH_TYPE_FAILURE or NO_VALIDATOR */
+ circuit->auth_type_failures++;
+ if (circuit->is_type == IS_LEVEL_1) {
+ circuit->area->auth_type_failures[0]++;
+ } else if (circuit->is_type == IS_LEVEL_2) {
+ circuit->area->auth_type_failures[1]++;
+ } else {
+ circuit->area->auth_type_failures[0]++;
+ circuit->area->auth_type_failures[1]++;
+ }
+ isis_notif_authentication_type_failure(circuit, raw_pdu,
+ sizeof(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 %pLS, seq 0x%08x, cksum 0x%04hx, lifetime %hus on %s",
+ circuit->area->area_tag, 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 %pLS seq 0x%08x with confused checksum received.",
+ circuit->area->area_tag, 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 */
+ circuit->area
+ ->lsp_seqno_skipped_counter++;
+ isis_notif_seqno_skipped(
+ circuit, 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 %pLS new seq 0x%08x",
+ circuit->area->area_tag,
+ 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, 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 */
+ circuit->area->lsp_seqno_skipped_counter++;
+ isis_notif_seqno_skipped(circuit, hdr.lsp_id);
+#endif /* ifndef FABRICD */
+ if (IS_DEBUG_UPDATE_PACKETS) {
+ zlog_debug(
+ "ISIS-Upd (%s): (2) re-originating LSP %pLS new seq 0x%08x",
+ circuit->area->area_tag, 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 %pSY on %s, skipping: we are not the DIS",
+ circuit->area->area_tag, level, typechar, 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++;
+ if (circuit->is_type == IS_LEVEL_1) {
+ circuit->area->auth_failures[0]++;
+ } else if (circuit->is_type == IS_LEVEL_2) {
+ circuit->area->auth_failures[1]++;
+ } else {
+ circuit->area->auth_failures[0]++;
+ circuit->area->auth_failures[1]++;
+ }
+ isis_notif_authentication_failure(
+ circuit, raw_pdu, sizeof(raw_pdu));
+ } else { /* AUTH_TYPE_FAILURE or NO_VALIDATOR */
+ circuit->auth_type_failures++;
+ if (circuit->is_type == IS_LEVEL_1) {
+ circuit->area->auth_type_failures[0]++;
+ } else if (circuit->is_type == IS_LEVEL_2) {
+ circuit->area->auth_type_failures[1]++;
+ } else {
+ circuit->area->auth_type_failures[0]++;
+ circuit->area->auth_type_failures[1]++;
+ }
+ isis_notif_authentication_type_failure(
+ circuit, raw_pdu, sizeof(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 %pSY on %s",
+ circuit->area->area_tag, level, typechar, ssnpa,
+ circuit->interface->name);
+ for (struct isis_lsp_entry *entry = entry_head; entry;
+ entry = entry->next) {
+ zlog_debug(
+ "ISIS-Snp (%s): %cSNP entry %pLS, seq 0x%08x, cksum 0x%04hx, lifetime %hus",
+ circuit->area->area_tag, typechar, 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);
+ pdu_counter_count_drop(circuit->area, pdu_type);
+ return ISIS_ERROR;
+ }
+
+ if (idrp != ISO10589_ISIS) {
+ flog_err(EC_ISIS_PACKET, "Not an IS-IS packet IDRP=%hhx",
+ idrp);
+ pdu_counter_count_drop(circuit->area, pdu_type);
+ 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,
+ sizeof(raw_pdu));
+#endif /* ifndef FABRICD */
+ pdu_counter_count_drop(circuit->area, pdu_type);
+ 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++;
+ if (circuit->is_type == IS_LEVEL_1) {
+ circuit->area->id_len_mismatches[0]++;
+ } else if (circuit->is_type == IS_LEVEL_2) {
+ circuit->area->id_len_mismatches[1]++;
+ } else {
+ circuit->area->id_len_mismatches[0]++;
+ circuit->area->id_len_mismatches[1]++;
+ }
+
+#ifndef FABRICD
+ /* send northbound notification */
+ isis_notif_id_len_mismatch(circuit, id_len, raw_pdu,
+ sizeof(raw_pdu));
+#endif /* ifndef FABRICD */
+ pdu_counter_count_drop(circuit->area, pdu_type);
+ return ISIS_ERROR;
+ }
+
+ uint8_t expected_length;
+ if (pdu_size(pdu_type, &expected_length)) {
+ zlog_warn("Unsupported ISIS PDU %hhu", pdu_type);
+ pdu_counter_count_drop(circuit->area, 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);
+ pdu_counter_count_drop(circuit->area, pdu_type);
+ 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.");
+ pdu_counter_count_drop(circuit->area, 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,
+ sizeof(raw_pdu));
+#endif /* ifndef FABRICD */
+ pdu_counter_count_drop(circuit->area, pdu_type);
+ return ISIS_WARNING;
+ }
+
+ if (circuit->is_passive) {
+ zlog_warn("Received ISIS PDU on passive circuit %s",
+ circuit->interface->name);
+ pdu_counter_count_drop(circuit->area, pdu_type);
+ 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, sizeof(raw_pdu));
+#endif /* ifndef FABRICD */
+ pdu_counter_count_drop(circuit->area, pdu_type);
+ return ISIS_ERROR;
+ }
+
+ switch (pdu_type) {
+ case L1_LAN_HELLO:
+ case L2_LAN_HELLO:
+ case P2P_HELLO:
+ if (fabricd && pdu_type != P2P_HELLO) {
+ pdu_counter_count_drop(circuit->area, pdu_type);
+ 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) {
+ pdu_counter_count_drop(circuit->area, pdu_type);
+ 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:
+ pdu_counter_count_drop(circuit->area, pdu_type);
+ return ISIS_ERROR;
+ }
+
+ if (retval != ISIS_OK)
+ pdu_counter_count_drop(circuit->area, pdu_type);
+
+ return retval;
+}
+
+void isis_receive(struct event *thread)
+{
+ struct isis_circuit *circuit;
+ uint8_t ssnpa[ETH_ALEN];
+
+ /*
+ * Get the circuit
+ */
+ circuit = EVENT_ARG(thread);
+ assert(circuit);
+
+ circuit->t_read = NULL;
+
+ isis_circuit_stream(circuit, &circuit->rcv_stream);
+
+#if ISIS_METHOD != ISIS_METHOD_BPF
+ int retval;
+
+ retval = circuit->rx(circuit, ssnpa);
+
+ if (retval == ISIS_OK)
+ isis_handle_pdu(circuit, ssnpa);
+#else // ISIS_METHOD != ISIS_METHOD_BPF
+ circuit->rx(circuit, ssnpa);
+#endif
+
+ /*
+ * prepare for next packet.
+ */
+ if (!circuit->is_passive)
+ isis_circuit_prepare(circuit);
+}
+
+/*
+ * 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)
+ isis_tlvs_add_ipv6_addresses(tlvs, circuit->ipv6_link);
+
+ /* RFC6119 section 4 define TLV 233 to provide Global IPv6 address */
+ if (circuit->ipv6_router)
+ isis_tlvs_add_global_ipv6_addresses(tlvs,
+ circuit->ipv6_non_link);
+
+ bool should_pad_hello =
+ circuit->pad_hellos == ISIS_HELLO_PADDING_ALWAYS ||
+ (circuit->pad_hellos ==
+ ISIS_HELLO_PADDING_DURING_ADJACENCY_FORMATION &&
+ circuit->upadjcount[0] + circuit->upadjcount[1] == 0);
+
+ if (isis_pack_tlvs(tlvs, circuit->snd_stream, len_pointer,
+ should_pad_hello, 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 void send_hello_cb(struct event *thread)
+{
+ struct isis_circuit_arg *arg = EVENT_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;
+ }
+
+ 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;
+ }
+
+ 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;
+ }
+
+ if (circuit->u.bc.run_dr_elect[level - 1])
+ isis_dr_elect(circuit, level);
+
+ send_hello(circuit, level);
+
+ /* set next timer thread */
+ send_hello_sched(circuit, level, 1000 * circuit->hello_interval[level - 1]);
+}
+
+static void _send_hello_sched(struct isis_circuit *circuit,
+ struct event **threadp, int level, long delay)
+{
+ if (*threadp) {
+ if (event_timer_remain_msec(*threadp) < (unsigned long)delay)
+ return;
+
+ EVENT_OFF(*threadp);
+ }
+
+ event_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 accommodated 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, NULL));
+ 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;
+}
+
+void send_l1_csnp(struct event *thread)
+{
+ struct isis_circuit *circuit;
+
+ circuit = EVENT_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 */
+ event_add_timer(master, send_l1_csnp, circuit,
+ isis_jitter(circuit->csnp_interval[0], CSNP_JITTER),
+ &circuit->t_send_csnp[0]);
+}
+
+void send_l2_csnp(struct event *thread)
+{
+ struct isis_circuit *circuit;
+
+ circuit = EVENT_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 */
+ event_add_timer(master, send_l2_csnp, circuit,
+ isis_jitter(circuit->csnp_interval[1], CSNP_JITTER),
+ &circuit->t_send_csnp[1]);
+}
+
+/*
+ * 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, NULL));
+ 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;
+}
+
+void send_l1_psnp(struct event *thread)
+{
+
+ struct isis_circuit *circuit;
+
+ circuit = EVENT_ARG(thread);
+ assert(circuit);
+
+ circuit->t_send_psnp[0] = NULL;
+
+ send_psnp(1, circuit);
+ /* set next timer thread */
+ event_add_timer(master, send_l1_psnp, circuit,
+ isis_jitter(circuit->psnp_interval[0], PSNP_JITTER),
+ &circuit->t_send_psnp[0]);
+}
+
+/*
+ * 7.3.15.4 action on expiration of partial SNP interval
+ * level 2
+ */
+void send_l2_psnp(struct event *thread)
+{
+ struct isis_circuit *circuit;
+
+ circuit = EVENT_ARG(thread);
+ assert(circuit);
+
+ circuit->t_send_psnp[1] = NULL;
+
+ send_psnp(2, circuit);
+
+ /* set next timer thread */
+ event_add_timer(master, send_l2_psnp, circuit,
+ isis_jitter(circuit->psnp_interval[1], PSNP_JITTER),
+ &circuit->t_send_psnp[1]);
+}
+
+/*
+ * 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 %pLS, 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, 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),
+ 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 %pLS, seq 0x%08x, cksum 0x%04hx, lifetime %hus on %s",
+ circuit->area->area_tag,
+ (tx_type == TX_LSP_CIRCUIT_SCOPED) ? "Circuit scoped "
+ : "",
+ lsp->level, 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);
+ }
+}
+
+void isis_log_pdu_drops(struct isis_area *area, const char *pdu_type)
+{
+ uint64_t total_drops = 0;
+
+ for (int i = 0; i < PDU_COUNTER_SIZE; i++) {
+ if (!area->pdu_drop_counters[i])
+ continue;
+ total_drops += area->pdu_drop_counters[i];
+ }
+
+ zlog_info("PDU drop detected of type: %s. %" PRIu64
+ " Total Drops; %" PRIu64 " L1 IIH drops; %" PRIu64
+ " L2 IIH drops; %" PRIu64 " P2P IIH drops; %" PRIu64
+ " L1 LSP drops; %" PRIu64 " L2 LSP drops; %" PRIu64
+ " FS LSP drops; %" PRIu64 " L1 CSNP drops; %" PRIu64
+ " L2 CSNP drops; %" PRIu64 " L1 PSNP drops; %" PRIu64
+ " L2 PSNP drops.",
+ pdu_type, total_drops,
+ pdu_counter_get_count(area->pdu_drop_counters, L1_LAN_HELLO),
+ pdu_counter_get_count(area->pdu_drop_counters, L2_LAN_HELLO),
+ pdu_counter_get_count(area->pdu_drop_counters, P2P_HELLO),
+ pdu_counter_get_count(area->pdu_drop_counters, L1_LINK_STATE),
+ pdu_counter_get_count(area->pdu_drop_counters, L2_LINK_STATE),
+ pdu_counter_get_count(area->pdu_drop_counters, FS_LINK_STATE),
+ pdu_counter_get_count(area->pdu_drop_counters,
+ L1_COMPLETE_SEQ_NUM),
+ pdu_counter_get_count(area->pdu_drop_counters,
+ L2_COMPLETE_SEQ_NUM),
+ pdu_counter_get_count(area->pdu_drop_counters,
+ L1_PARTIAL_SEQ_NUM),
+ pdu_counter_get_count(area->pdu_drop_counters,
+ L2_PARTIAL_SEQ_NUM));
+}