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Yuxuan LuoCacheUseOnly
Yuxuan Luo
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CacheUseOnly
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SCTP: Support ASCONF/-ACK chunk
Add support for printing ASCONF and ASCONF-ACK chunk based on RFC5061. Remove REL_CNTL(0xc1) because it's obsolete and conflicts with ASCONF. Prints all ASCONF parameters with `-vv` set. Example: `-v`: [ASCONF] [SEQ: .., ADDR: 192...] [DEL ADDR] `-vv`:[ASCONF] [SEQ: .., ADDR: 192...] [DEL ADDR: C-ID: 0, ADDR: 192...] [ASCONF-ACK] [SEQ: 4161214189]
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10 files changed

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-2
lines changed

10 files changed

+582
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lines changed

‎print-sctp.c‎

Lines changed: 225 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -112,9 +112,10 @@
112112
#define SCTP_ECN_CWR 0x0d
113113
#define SCTP_SHUTDOWN_COMPLETE 0x0e
114114
#define SCTP_I_DATA 0x40
115+
#define SCTP_ASCONF_ACK 0x80
115116
#define SCTP_RE_CONFIG 0x82
116117
#define SCTP_FORWARD_CUM_TSN 0xc0
117-
#define SCTP_RELIABLE_CNTL 0xc1
118+
#define SCTP_ASCONF 0xc1
118119
#define SCTP_I_FORWARD_TSN 0xc2
119120

120121
static const struct tok sctp_chunkid_str[] = {
@@ -136,7 +137,8 @@ static const struct tok sctp_chunkid_str[] = {
136137
{ SCTP_I_DATA, "I-DATA" },
137138
{ SCTP_RE_CONFIG, "RE-CONFIG" },
138139
{ SCTP_FORWARD_CUM_TSN, "FOR CUM TSN" },
139-
{ SCTP_RELIABLE_CNTL, "REL CTRL" },
140+
{ SCTP_ASCONF, "ASCONF" },
141+
{ SCTP_ASCONF_ACK, "ASCONF-ACK" },
140142
{ SCTP_I_FORWARD_TSN, "I-FORWARD-FSN" },
141143
{ 0, NULL }
142144
};
@@ -163,6 +165,18 @@ static const struct tok sctp_chunkid_str[] = {
163165

164166
#define SCTP_ADDRMAX 60
165167

168+
/* ASCONF Parameters*/
169+
/* - used in INIT/ACK chunk */
170+
#define SET_PRI_ADDR 0xC004
171+
#define ADAPT_LAYER_INDIC 0xC006
172+
#define SUPPORTED_EXT 0x8008
173+
/* - used in ASCONF param */
174+
#define ADD_IP_ADDR 0xC001
175+
#define DEL_IP_ADDR 0xC002
176+
/* - used in ASCONF response */
177+
#define ERR_CAUSE_INDIC 0xC003
178+
#define SUCCESS_INDIC 0xC005
179+
166180
#define CHAN_HP 6704
167181
#define CHAN_MP 6705
168182
#define CHAN_LP 6706
@@ -411,6 +425,35 @@ struct addStreamReq{
411425
nd_uint16_t reserved;
412426
};
413427

428+
/* ASCONF parameters */
429+
struct sctpAsconfParam{
430+
nd_uint16_t type;
431+
nd_uint16_t length;
432+
nd_uint32_t CID;
433+
union {
434+
struct sctpV4IpAddress ipv4;
435+
struct sctpV6IpAddress ipv6;
436+
} addr;
437+
};
438+
439+
struct sctpAsconfParamRes{
440+
nd_uint16_t type;
441+
nd_uint16_t length;
442+
nd_uint32_t CID;
443+
};
444+
445+
struct sctpASCONF{
446+
nd_uint32_t seq_num;
447+
union {
448+
struct sctpV4IpAddress ipv4;
449+
struct sctpV6IpAddress ipv6;
450+
} addr;
451+
};
452+
453+
struct sctpASCONF_ACK{
454+
nd_uint32_t seq_num;
455+
};
456+
414457
struct sctpUnifiedDatagram{
415458
struct sctpChunkDesc uh;
416459
struct sctpDataPart dp;
@@ -449,6 +492,35 @@ static const struct tok results[] = {
449492
{ 0, NULL }
450493
};
451494

495+
/* ASCONF tokens */
496+
static const struct tok asconfigParams[] = {
497+
{ SET_PRI_ADDR, "SET PRIM ADDR" },
498+
{ ADAPT_LAYER_INDIC, "Adaptation Layer Indication" },
499+
{ SUPPORTED_EXT, "Supported Extensions" },
500+
{ ADD_IP_ADDR, "ADD ADDR" },
501+
{ DEL_IP_ADDR, "DEL ADDR" },
502+
{ ERR_CAUSE_INDIC, "ERR" },
503+
{ SUCCESS_INDIC, "SUCCESS" },
504+
{ 0, NULL }
505+
};
506+
507+
static const struct tok causeCode[] = {
508+
{ 1, "Invalid Stream Identifier" },
509+
{ 2, "Missing Mandatory Parameter" },
510+
{ 3, "Stale Cookie Error" },
511+
{ 4, "Out of Resource" },
512+
{ 5, "Unresolvable Address" },
513+
{ 6, "Unrecognized Chunk Type" },
514+
{ 7, "Invalid Mandatory Parameter" },
515+
{ 8, "Unrecognized Parameters" },
516+
{ 9, "No User Data" },
517+
{ 10, "Cookie Received While Shutting Down" },
518+
{ 11, "Restart of an Association with New Addresses" },
519+
{ 12, "User Initiated Abort" },
520+
{ 13, "Protocol Violation" },
521+
{ 0, NULL }
522+
};
523+
452524
static const struct tok ForCES_channels[] = {
453525
{ CHAN_HP, "ForCES HP" },
454526
{ CHAN_MP, "ForCES MP" },
@@ -1120,6 +1192,157 @@ sctp_print(netdissect_options *ndo,
11201192
bp += chunkLengthRemaining;
11211193
chunkLengthRemaining = 0;
11221194

1195+
break;
1196+
}
1197+
case SCTP_ASCONF:
1198+
{
1199+
const struct sctpASCONF *content;
1200+
const struct sctpAsconfParam *param;
1201+
size_t length;
1202+
uint16_t param_len;
1203+
1204+
/* Should be at least longer than the length of IPv4 typed parameter*/
1205+
length = sizeof(nd_uint32_t) + sizeof(struct sctpV4IpAddress);
1206+
ND_ICHECKMSG_ZU("chunk length", chunkLengthRemaining, <, length);
1207+
content = (const struct sctpASCONF*) bp;
1208+
ND_PRINT("[SEQ: %u, ", GET_BE_U_4(content->seq_num));
1209+
1210+
if (GET_BE_U_2(content->addr.ipv4.p.paramType) == 5) { /* IPv4 */
1211+
ND_ICHECKMSG_ZU("chunk length", chunkLengthRemaining, <, length);
1212+
ND_PRINT("ADDR: %s] ", GET_IPADDR_STRING(content->addr.ipv4.ipAddress));
1213+
} else if (GET_BE_U_2(content->addr.ipv6.p.paramType) == 6) { /* IPv6 */
1214+
length = sizeof(nd_uint32_t) + sizeof(struct sctpV6IpAddress);
1215+
ND_ICHECKMSG_ZU("chunk length", chunkLengthRemaining, <, length);
1216+
ND_PRINT("ADDR: %s] ", GET_IP6ADDR_STRING(content->addr.ipv6.ipAddress));
1217+
} else {
1218+
length = sizeof(nd_uint32_t) + GET_BE_U_2(content->addr.ipv4.p.paramLength);
1219+
ND_ICHECKMSG_ZU("chunk length", chunkLengthRemaining, <, length);
1220+
ND_PRINT("ADDR: bogus address type]");
1221+
}
1222+
bp += length;
1223+
chunkLengthRemaining -= length;
1224+
sctpPacketLengthRemaining -= length;
1225+
1226+
while (0 != chunkLengthRemaining) {
1227+
ND_ICHECKMSG_ZU("chunk length", chunkLengthRemaining, <, sizeof(uint32_t)); /* ensure param_len can be extracted */
1228+
param = (const struct sctpAsconfParam*) bp;
1229+
param_len = GET_BE_U_2(param->length);
1230+
ND_ICHECKMSG_ZU("parameter length", param_len, <, sizeof(uint16_t));
1231+
1232+
ND_ICHECKMSG_U("chunk length", chunkLengthRemaining, <, param_len);
1233+
bp += param_len;
1234+
chunkLengthRemaining -= param_len;
1235+
sctpPacketLengthRemaining -= param_len;
1236+
1237+
ND_PRINT("[%s", tok2str(asconfigParams, NULL, GET_BE_U_2(param->type)));
1238+
1239+
if (ndo->ndo_vflag >= 2) {
1240+
ND_PRINT(": C-ID: %u, ", GET_BE_U_4(param->CID));
1241+
if (GET_BE_U_2(param->addr.ipv4.p.paramType) == 5) { /* IPv4 */
1242+
length = sizeof(nd_uint32_t) + sizeof(struct sctpV4IpAddress);
1243+
ND_ICHECKMSG_ZU("param length", param_len, <, length);
1244+
ND_PRINT("ADDR: %s] ", GET_IPADDR_STRING(param->addr.ipv4.ipAddress));
1245+
} else if (GET_BE_U_2(param->addr.ipv4.p.paramType) == 6) { /* IPv6 */
1246+
length = sizeof(nd_uint32_t) + sizeof(struct sctpV6IpAddress);
1247+
ND_ICHECKMSG_ZU("param length", param_len, <, length);
1248+
ND_PRINT("ADDR: %s] ", GET_IP6ADDR_STRING(param->addr.ipv6.ipAddress));
1249+
} else {
1250+
ND_PRINT("ADDR: bogus address type]");
1251+
}
1252+
} else {
1253+
ND_PRINT("]");
1254+
}
1255+
}
1256+
break;
1257+
}
1258+
case SCTP_ASCONF_ACK:
1259+
{
1260+
const struct sctpASCONF_ACK *content;
1261+
const struct sctpAsconfParamRes *param;
1262+
uint16_t param_len;
1263+
1264+
ND_ICHECKMSG_ZU("chunk length", chunkLengthRemaining, <, sizeof(*content));
1265+
content = (const struct sctpASCONF_ACK*) bp;
1266+
ND_PRINT("[SEQ: %u] ", GET_BE_U_4(content->seq_num));
1267+
1268+
bp += sizeof(*content);
1269+
chunkLengthRemaining -= sizeof(*content);
1270+
sctpPacketLengthRemaining -= sizeof(*content);
1271+
1272+
while (0 != chunkLengthRemaining) {
1273+
ND_ICHECKMSG_ZU("chunk length", chunkLengthRemaining, <, sizeof(struct sctpAsconfParamRes));
1274+
param = (const struct sctpAsconfParamRes*) bp;
1275+
param_len = GET_BE_U_2(param->length);
1276+
ND_ICHECKMSG_ZU("parameter length", param_len, <, sizeof(struct sctpAsconfParamRes));
1277+
ND_ICHECKMSG_U("chunk length", chunkLengthRemaining, <, param_len);
1278+
1279+
ND_PRINT("[%s", tok2str(asconfigParams, NULL, GET_BE_U_2(param->type)));
1280+
sctpPacketLengthRemaining -= param_len;
1281+
1282+
/* print payload only when vflag >= 2 */
1283+
if (ndo->ndo_vflag < 2) {
1284+
ND_PRINT("] ");
1285+
bp += param_len;
1286+
chunkLengthRemaining -= param_len;
1287+
continue;
1288+
}
1289+
1290+
switch (GET_BE_U_2(param->type)) {
1291+
case ERR_CAUSE_INDIC:
1292+
{
1293+
uint16_t cause_len;
1294+
const struct sctpOpErrorCause *err_cause;
1295+
1296+
ND_PRINT(": C-ID: %u ", GET_BE_U_4(param->CID));
1297+
bp += sizeof(struct sctpAsconfParamRes);
1298+
param_len -= sizeof(struct sctpAsconfParamRes);
1299+
chunkLengthRemaining -= sizeof(struct sctpAsconfParamRes);
1300+
if (0 == param_len) {
1301+
ND_PRINT("] ");
1302+
break;
1303+
}
1304+
1305+
/* check against ERROR length */
1306+
ND_ICHECKMSG_ZU("chunk length", param_len, <, sizeof(uint32_t));
1307+
bp += sizeof(uint16_t);
1308+
ND_ICHECKMSG_U("param length", param_len, <, GET_BE_U_2(bp));
1309+
bp += sizeof(uint16_t);
1310+
param_len -= sizeof(uint32_t);
1311+
chunkLengthRemaining -= sizeof(uint32_t);
1312+
1313+
while (0 != param_len) {
1314+
ND_ICHECKMSG_ZU("param length", param_len, <, sizeof(*err_cause));
1315+
err_cause = (const struct sctpOpErrorCause*) bp;
1316+
cause_len = GET_BE_U_2(err_cause->causeLen);
1317+
ND_ICHECKMSG_U("cause length", cause_len, >, param_len);
1318+
ND_ICHECKMSG_ZU("cause length", cause_len, <, sizeof(*err_cause));
1319+
ND_PRINT("%s, ", tok2str(causeCode, NULL, GET_BE_U_2(err_cause->cause)));
1320+
1321+
bp += cause_len;
1322+
param_len -= cause_len;
1323+
chunkLengthRemaining -= cause_len;
1324+
}
1325+
ND_PRINT("] ");
1326+
break;
1327+
}
1328+
case SUCCESS_INDIC:
1329+
{
1330+
ND_PRINT(": C-ID: %u ", GET_BE_U_4(param->CID));
1331+
bp += sizeof(struct sctpAsconfParamRes);
1332+
param_len -= sizeof(struct sctpAsconfParamRes);
1333+
chunkLengthRemaining -= sizeof(struct sctpAsconfParamRes);
1334+
break;
1335+
}
1336+
default:
1337+
{
1338+
ND_PRINT("Unknown parameter] ");
1339+
bp += param_len;
1340+
chunkLengthRemaining -= param_len;
1341+
param_len -= param_len;
1342+
break;
1343+
}
1344+
}
1345+
}
11231346
break;
11241347
}
11251348
default :

‎tests/TESTLIST‎

Lines changed: 8 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -62,6 +62,14 @@ sctp-re-config sctp-re-config.pcap sctp-re-config.out
6262
sctp-re-config-v sctp-re-config.pcap sctp-re-config-v.out -v
6363
sctp-re-config-vv sctp-re-config.pcap sctp-re-config-vv.out -vv
6464

65+
# ASCONF tests
66+
sctp-asconf sctp-asconf.pcap sctp-asconf.out
67+
sctp-asconf-v sctp-asconf.pcap sctp-asconf-v.out -v
68+
sctp-asconf-vv sctp-asconf.pcap sctp-asconf-vv.out -vv
69+
sctp-asconf-6 sctp-asconf-6.pcap sctp-asconf-6.out
70+
sctp-asconf-6-v sctp-asconf-6.pcap sctp-asconf-6-v.out -v
71+
sctp-asconf-6-vv sctp-asconf-6.pcap sctp-asconf-6-vv.out -vv
72+
6573
# BGP tests
6674
bgp_vpn_attrset bgp_vpn_attrset.pcap bgp_vpn_attrset.out -v
6775
mpbgp-linklocal-nexthop mpbgp-linklocal-nexthop.pcap mpbgp-linklocal-nexthop.out -v

‎tests/sctp-asconf-6-v.out‎

Lines changed: 36 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,36 @@
1+
1 21:07:01.838221 IP6 (class 0x02, flowlabel 0xe0c15, hlim 64, next-header SCTP (132) payload length: 56) 2000::5:1.36296 > 2000::5:2.36297: sctp (1) [INIT] [init tag: 3545157994] [rwnd: 106496] [OS: 10] [MIS: 65535] [init TSN: 1518935751]
2+
2 21:07:01.838256 IP6 (class 0x02, flowlabel 0x58603, hlim 64, next-header SCTP (132) payload length: 384) 2000::5:4.36297 > 2000::5:1.36296: sctp (1) [INIT ACK] [init tag: 2419719451] [rwnd: 106496] [OS: 5] [MIS: 5] [init TSN: 3794555581]
3+
3 21:07:01.838267 IP6 (class 0x02, flowlabel 0xe0c15, hlim 64, next-header SCTP (132) payload length: 308) 2000::5:1.36296 > 2000::5:2.36297: sctp (1) [COOKIE ECHO]
4+
4 21:07:01.838279 IP6 (class 0x02, flowlabel 0x58603, hlim 64, next-header SCTP (132) payload length: 16) 2000::5:4.36297 > 2000::5:1.36296: sctp (1) [COOKIE ACK]
5+
5 21:07:01.838290 IP6 (class 0x02, flowlabel 0xe0c15, hlim 64, next-header SCTP (132) payload length: 40) 2000::5:1.36296 > 2000::5:2.36297: sctp (1) [DATA] (B)(E) [TSN: 1518935751] [SID: 0] [SSEQ 0] [PPID 0x0]
6+
6 21:07:01.838295 IP6 (class 0x02, flowlabel 0x58603, hlim 64, next-header SCTP (132) payload length: 28) 2000::5:4.36297 > 2000::5:1.36296: sctp (1) [SACK] [cum ack 1518935751] [a_rwnd 106486] [#gap acks 0] [#dup tsns 0]
7+
7 21:07:01.838366 IP6 (class 0x02, flowlabel 0x58603, hlim 64, next-header SCTP (132) payload length: 40) 2000::5:4.36297 > 2000::5:1.36296: sctp (1) [DATA] (B)(E) [TSN: 3794555581] [SID: 0] [SSEQ 0] [PPID 0x0]
8+
8 21:07:01.838373 IP6 (class 0x02, flowlabel 0xe0c15, hlim 64, next-header SCTP (132) payload length: 28) 2000::5:1.36296 > 2000::5:2.36297: sctp (1) [SACK] [cum ack 3794555581] [a_rwnd 106486] [#gap acks 0] [#dup tsns 0]
9+
9 21:07:01.838446 IP6 (class 0x02, flowlabel 0xe0c15, hlim 64, next-header SCTP (132) payload length: 68) 2000::5:1.36296 > 2000::5:2.36297: sctp (1) [ASCONF] [SEQ: 1518935751, ADDR: 2000::5:1] [ADD ADDR]
10+
10 21:07:01.838458 IP6 (class 0x02, flowlabel 0x58603, hlim 64, next-header SCTP (132) payload length: 20) 2000::5:4.36297 > 2000::5:1.36296: sctp (1) [ASCONF-ACK] [SEQ: 1518935751]
11+
11 21:07:01.838460 IP6 (class 0x02, flowlabel 0xbd008, hlim 64, next-header SCTP (132) payload length: 72) 2000::5:4.36297 > 2000::5:3.36296: sctp (1) [HB REQ]
12+
12 21:07:01.838473 IP6 (class 0x02, flowlabel 0xdbc67, hlim 64, next-header SCTP (132) payload length: 72) 2000::5:3.36296 > 2000::5:4.36297: sctp (1) [HB ACK]
13+
13 21:07:01.838482 IP6 (class 0x02, flowlabel 0xb69d3, hlim 64, next-header SCTP (132) payload length: 40) 2000::5:3.36296 > 2000::5:2.36297: sctp (1) [DATA] (B)(E) [TSN: 1518935752] [SID: 0] [SSEQ 1] [PPID 0x0]
14+
14 21:07:01.838571 IP6 (class 0x02, flowlabel 0x58603, hlim 64, next-header SCTP (132) payload length: 40) 2000::5:4.36297 > 2000::5:1.36296: sctp (1) [DATA] (B)(E) [TSN: 3794555582] [SID: 0] [SSEQ 1] [PPID 0x0]
15+
15 21:07:01.838657 IP6 (class 0x02, flowlabel 0xb69d3, hlim 64, next-header SCTP (132) payload length: 68) 2000::5:3.36296 > 2000::5:2.36297: sctp (1) [ASCONF] [SEQ: 1518935752, ADDR: 2000::5:3] [SET PRIM ADDR]
16+
16 21:07:01.838663 IP6 (class 0x02, flowlabel 0xbd008, hlim 64, next-header SCTP (132) payload length: 20) 2000::5:4.36297 > 2000::5:3.36296: sctp (1) [ASCONF-ACK] [SEQ: 1518935752]
17+
17 21:07:02.042022 IP6 (class 0x02, flowlabel 0xb69d3, hlim 64, next-header SCTP (132) payload length: 72) 2000::5:3.36296 > 2000::5:2.36297: sctp (1) [SACK] [cum ack 3794555582] [a_rwnd 106496] [#gap acks 0] [#dup tsns 0] , (2) [DATA] (B)(E) [TSN: 1518935753] [SID: 0] [SSEQ 2] [PPID 0x0]
18+
18 21:07:02.042022 IP6 (class 0x02, flowlabel 0xbd008, hlim 64, next-header SCTP (132) payload length: 28) 2000::5:4.36297 > 2000::5:3.36296: sctp (1) [SACK] [cum ack 1518935752] [a_rwnd 106496] [#gap acks 0] [#dup tsns 0]
19+
19 21:07:02.042090 IP6 (class 0x02, flowlabel 0xbd008, hlim 64, next-header SCTP (132) payload length: 72) 2000::5:4.36297 > 2000::5:3.36296: sctp (1) [SACK] [cum ack 1518935753] [a_rwnd 106496] [#gap acks 0] [#dup tsns 0] , (2) [DATA] (B)(E) [TSN: 3794555583] [SID: 0] [SSEQ 2] [PPID 0x0]
20+
20 21:07:02.042124 IP6 (class 0x02, flowlabel 0xb69d3, hlim 64, next-header SCTP (132) payload length: 48) 2000::5:3.36296 > 2000::5:2.36297: sctp (1) [DATA] (B)(E) [TSN: 1518935754] [SID: 0] [SSEQ 3] [PPID 0x0]
21+
21 21:07:02.246022 IP6 (class 0x02, flowlabel 0xb69d3, hlim 64, next-header SCTP (132) payload length: 28) 2000::5:3.36296 > 2000::5:2.36297: sctp (1) [SACK] [cum ack 3794555583] [a_rwnd 106496] [#gap acks 0] [#dup tsns 0]
22+
22 21:07:02.246022 IP6 (class 0x02, flowlabel 0xbd008, hlim 64, next-header SCTP (132) payload length: 64) 2000::5:4.36297 > 2000::5:3.36296: sctp (1) [SACK] [cum ack 1518935754] [a_rwnd 106496] [#gap acks 0] [#dup tsns 0] , (2) [DATA] (B)(E) [TSN: 3794555584] [SID: 0] [SSEQ 3] [PPID 0x0]
23+
23 21:07:02.246091 IP6 (class 0x02, flowlabel 0xe0c15, hlim 64, next-header SCTP (132) payload length: 68) 2000::5:1.36296 > 2000::5:2.36297: sctp (1) [ASCONF] [SEQ: 1518935753, ADDR: 2000::5:1] [DEL ADDR]
24+
24 21:07:02.246099 IP6 (class 0x02, flowlabel 0x58603, hlim 64, next-header SCTP (132) payload length: 20) 2000::5:4.36297 > 2000::5:1.36296: sctp (1) [ASCONF-ACK] [SEQ: 1518935753]
25+
25 21:07:02.246111 IP6 (class 0x02, flowlabel 0xe0c15, hlim 64, next-header SCTP (132) payload length: 44) 2000::5:1.36296 > 2000::5:2.36297: sctp (1) [DATA] (B)(E) [TSN: 1518935755] [SID: 0] [SSEQ 4] [PPID 0x0]
26+
26 21:07:02.450049 IP6 (class 0x02, flowlabel 0xe0c15, hlim 64, next-header SCTP (132) payload length: 28) 2000::5:1.36296 > 2000::5:2.36297: sctp (1) [SACK] [cum ack 3794555584] [a_rwnd 106496] [#gap acks 0] [#dup tsns 0]
27+
27 21:07:02.450029 IP6 (class 0x02, flowlabel 0x58603, hlim 64, next-header SCTP (132) payload length: 60) 2000::5:4.36297 > 2000::5:1.36296: sctp (1) [SACK] [cum ack 1518935755] [a_rwnd 106496] [#gap acks 0] [#dup tsns 0] , (2) [DATA] (B)(E) [TSN: 3794555585] [SID: 0] [SSEQ 4] [PPID 0x0]
28+
28 21:07:02.450102 IP6 (class 0x02, flowlabel 0xe0c15, hlim 64, next-header SCTP (132) payload length: 20) 2000::5:1.36296 > 2000::5:2.36297: sctp (1) [SHUTDOWN]
29+
29 21:07:02.450134 IP6 (class 0x02, flowlabel 0x58603, hlim 64, next-header SCTP (132) payload length: 16) 2000::5:4.36297 > 2000::5:1.36296: sctp (1) [SHUTDOWN ACK]
30+
30 21:07:02.450138 IP6 (class 0x02, flowlabel 0xe0c15, hlim 64, next-header SCTP (132) payload length: 16) 2000::5:1.36296 > 2000::5:2.36297: sctp (1) [SHUTDOWN COMPLETE]
31+
31 21:07:06.938038 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 32) fe80::f4c7:7eff:fe0f:83fe > 2000::5:4: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has 2000::5:4
32+
source link-address option (1), length 8 (1): f6:c7:7e:0f:83:fe
33+
32 21:07:06.938050 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 32) fe80::accc:f7ff:fec3:1790 > 2000::5:3: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has 2000::5:3
34+
source link-address option (1), length 8 (1): ae:cc:f7:c3:17:90
35+
33 21:07:06.938078 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 24) 2000::5:3 > fe80::accc:f7ff:fec3:1790: [icmp6 sum ok] ICMP6, neighbor advertisement, length 24, tgt is 2000::5:3, Flags [solicited]
36+
34 21:07:06.938074 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 24) 2000::5:4 > fe80::f4c7:7eff:fe0f:83fe: [icmp6 sum ok] ICMP6, neighbor advertisement, length 24, tgt is 2000::5:4, Flags [solicited]

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