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SCTP: Support ASCONF/-ACK chunk
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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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@CacheUseOnly
Yuxuan Luo authored and CacheUseOnly committed Mar 23, 2024
1 parent 541b801 commit fe1cb32
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Showing 10 changed files with 582 additions and 2 deletions.
227 changes: 225 additions & 2 deletions print-sctp.c
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Original file line number Diff line number Diff line change
Expand Up @@ -112,9 +112,10 @@
#define SCTP_ECN_CWR 0x0d
#define SCTP_SHUTDOWN_COMPLETE 0x0e
#define SCTP_I_DATA 0x40
#define SCTP_ASCONF_ACK 0x80
#define SCTP_RE_CONFIG 0x82
#define SCTP_FORWARD_CUM_TSN 0xc0
#define SCTP_RELIABLE_CNTL 0xc1
#define SCTP_ASCONF 0xc1
#define SCTP_I_FORWARD_TSN 0xc2

static const struct tok sctp_chunkid_str[] = {
Expand All @@ -136,7 +137,8 @@ static const struct tok sctp_chunkid_str[] = {
{ SCTP_I_DATA, "I-DATA" },
{ SCTP_RE_CONFIG, "RE-CONFIG" },
{ SCTP_FORWARD_CUM_TSN, "FOR CUM TSN" },
{ SCTP_RELIABLE_CNTL, "REL CTRL" },
{ SCTP_ASCONF, "ASCONF" },
{ SCTP_ASCONF_ACK, "ASCONF-ACK" },
{ SCTP_I_FORWARD_TSN, "I-FORWARD-FSN" },
{ 0, NULL }
};
Expand All @@ -163,6 +165,18 @@ static const struct tok sctp_chunkid_str[] = {

#define SCTP_ADDRMAX 60

/* ASCONF Parameters*/
/* - used in INIT/ACK chunk */
#define SET_PRI_ADDR 0xC004
#define ADAPT_LAYER_INDIC 0xC006
#define SUPPORTED_EXT 0x8008
/* - used in ASCONF param */
#define ADD_IP_ADDR 0xC001
#define DEL_IP_ADDR 0xC002
/* - used in ASCONF response */
#define ERR_CAUSE_INDIC 0xC003
#define SUCCESS_INDIC 0xC005

#define CHAN_HP 6704
#define CHAN_MP 6705
#define CHAN_LP 6706
Expand Down Expand Up @@ -411,6 +425,35 @@ struct addStreamReq{
nd_uint16_t reserved;
};

/* ASCONF parameters */
struct sctpAsconfParam{
nd_uint16_t type;
nd_uint16_t length;
nd_uint32_t CID;
union {
struct sctpV4IpAddress ipv4;
struct sctpV6IpAddress ipv6;
} addr;
};

struct sctpAsconfParamRes{
nd_uint16_t type;
nd_uint16_t length;
nd_uint32_t CID;
};

struct sctpASCONF{
nd_uint32_t seq_num;
union {
struct sctpV4IpAddress ipv4;
struct sctpV6IpAddress ipv6;
} addr;
};

struct sctpASCONF_ACK{
nd_uint32_t seq_num;
};

struct sctpUnifiedDatagram{
struct sctpChunkDesc uh;
struct sctpDataPart dp;
Expand Down Expand Up @@ -449,6 +492,35 @@ static const struct tok results[] = {
{ 0, NULL }
};

/* ASCONF tokens */
static const struct tok asconfigParams[] = {
{ SET_PRI_ADDR, "SET PRIM ADDR" },
{ ADAPT_LAYER_INDIC, "Adaptation Layer Indication" },
{ SUPPORTED_EXT, "Supported Extensions" },
{ ADD_IP_ADDR, "ADD ADDR" },
{ DEL_IP_ADDR, "DEL ADDR" },
{ ERR_CAUSE_INDIC, "ERR" },
{ SUCCESS_INDIC, "SUCCESS" },
{ 0, NULL }
};

static const struct tok causeCode[] = {
{ 1, "Invalid Stream Identifier" },
{ 2, "Missing Mandatory Parameter" },
{ 3, "Stale Cookie Error" },
{ 4, "Out of Resource" },
{ 5, "Unresolvable Address" },
{ 6, "Unrecognized Chunk Type" },
{ 7, "Invalid Mandatory Parameter" },
{ 8, "Unrecognized Parameters" },
{ 9, "No User Data" },
{ 10, "Cookie Received While Shutting Down" },
{ 11, "Restart of an Association with New Addresses" },
{ 12, "User Initiated Abort" },
{ 13, "Protocol Violation" },
{ 0, NULL }
};

static const struct tok ForCES_channels[] = {
{ CHAN_HP, "ForCES HP" },
{ CHAN_MP, "ForCES MP" },
Expand Down Expand Up @@ -1120,6 +1192,157 @@ sctp_print(netdissect_options *ndo,
bp += chunkLengthRemaining;
chunkLengthRemaining = 0;

break;
}
case SCTP_ASCONF:
{
const struct sctpASCONF *content;
const struct sctpAsconfParam *param;
size_t length;
uint16_t param_len;

/* Should be at least longer than the length of IPv4 typed parameter*/
length = sizeof(nd_uint32_t) + sizeof(struct sctpV4IpAddress);
ND_ICHECKMSG_ZU("chunk length", chunkLengthRemaining, <, length);
content = (const struct sctpASCONF*) bp;
ND_PRINT("[SEQ: %u, ", GET_BE_U_4(content->seq_num));

if (GET_BE_U_2(content->addr.ipv4.p.paramType) == 5) { /* IPv4 */
ND_ICHECKMSG_ZU("chunk length", chunkLengthRemaining, <, length);
ND_PRINT("ADDR: %s] ", GET_IPADDR_STRING(content->addr.ipv4.ipAddress));
} else if (GET_BE_U_2(content->addr.ipv6.p.paramType) == 6) { /* IPv6 */
length = sizeof(nd_uint32_t) + sizeof(struct sctpV6IpAddress);
ND_ICHECKMSG_ZU("chunk length", chunkLengthRemaining, <, length);
ND_PRINT("ADDR: %s] ", GET_IP6ADDR_STRING(content->addr.ipv6.ipAddress));
} else {
length = sizeof(nd_uint32_t) + GET_BE_U_2(content->addr.ipv4.p.paramLength);
ND_ICHECKMSG_ZU("chunk length", chunkLengthRemaining, <, length);
ND_PRINT("ADDR: bogus address type]");
}
bp += length;
chunkLengthRemaining -= length;
sctpPacketLengthRemaining -= length;

while (0 != chunkLengthRemaining) {
ND_ICHECKMSG_ZU("chunk length", chunkLengthRemaining, <, sizeof(uint32_t)); /* ensure param_len can be extracted */
param = (const struct sctpAsconfParam*) bp;
param_len = GET_BE_U_2(param->length);
ND_ICHECKMSG_ZU("parameter length", param_len, <, sizeof(uint16_t));

ND_ICHECKMSG_U("chunk length", chunkLengthRemaining, <, param_len);
bp += param_len;
chunkLengthRemaining -= param_len;
sctpPacketLengthRemaining -= param_len;

ND_PRINT("[%s", tok2str(asconfigParams, NULL, GET_BE_U_2(param->type)));

if (ndo->ndo_vflag >= 2) {
ND_PRINT(": C-ID: %u, ", GET_BE_U_4(param->CID));
if (GET_BE_U_2(param->addr.ipv4.p.paramType) == 5) { /* IPv4 */
length = sizeof(nd_uint32_t) + sizeof(struct sctpV4IpAddress);
ND_ICHECKMSG_ZU("param length", param_len, <, length);
ND_PRINT("ADDR: %s] ", GET_IPADDR_STRING(param->addr.ipv4.ipAddress));
} else if (GET_BE_U_2(param->addr.ipv4.p.paramType) == 6) { /* IPv6 */
length = sizeof(nd_uint32_t) + sizeof(struct sctpV6IpAddress);
ND_ICHECKMSG_ZU("param length", param_len, <, length);
ND_PRINT("ADDR: %s] ", GET_IP6ADDR_STRING(param->addr.ipv6.ipAddress));
} else {
ND_PRINT("ADDR: bogus address type]");
}
} else {
ND_PRINT("]");
}
}
break;
}
case SCTP_ASCONF_ACK:
{
const struct sctpASCONF_ACK *content;
const struct sctpAsconfParamRes *param;
uint16_t param_len;

ND_ICHECKMSG_ZU("chunk length", chunkLengthRemaining, <, sizeof(*content));
content = (const struct sctpASCONF_ACK*) bp;
ND_PRINT("[SEQ: %u] ", GET_BE_U_4(content->seq_num));

bp += sizeof(*content);
chunkLengthRemaining -= sizeof(*content);
sctpPacketLengthRemaining -= sizeof(*content);

while (0 != chunkLengthRemaining) {
ND_ICHECKMSG_ZU("chunk length", chunkLengthRemaining, <, sizeof(struct sctpAsconfParamRes));
param = (const struct sctpAsconfParamRes*) bp;
param_len = GET_BE_U_2(param->length);
ND_ICHECKMSG_ZU("parameter length", param_len, <, sizeof(struct sctpAsconfParamRes));
ND_ICHECKMSG_U("chunk length", chunkLengthRemaining, <, param_len);

ND_PRINT("[%s", tok2str(asconfigParams, NULL, GET_BE_U_2(param->type)));
sctpPacketLengthRemaining -= param_len;

/* print payload only when vflag >= 2 */
if (ndo->ndo_vflag < 2) {
ND_PRINT("] ");
bp += param_len;
chunkLengthRemaining -= param_len;
continue;
}

switch (GET_BE_U_2(param->type)) {
case ERR_CAUSE_INDIC:
{
uint16_t cause_len;
const struct sctpOpErrorCause *err_cause;

ND_PRINT(": C-ID: %u ", GET_BE_U_4(param->CID));
bp += sizeof(struct sctpAsconfParamRes);
param_len -= sizeof(struct sctpAsconfParamRes);
chunkLengthRemaining -= sizeof(struct sctpAsconfParamRes);
if (0 == param_len) {
ND_PRINT("] ");
break;
}

/* check against ERROR length */
ND_ICHECKMSG_ZU("chunk length", param_len, <, sizeof(uint32_t));
bp += sizeof(uint16_t);
ND_ICHECKMSG_U("param length", param_len, <, GET_BE_U_2(bp));
bp += sizeof(uint16_t);
param_len -= sizeof(uint32_t);
chunkLengthRemaining -= sizeof(uint32_t);

while (0 != param_len) {
ND_ICHECKMSG_ZU("param length", param_len, <, sizeof(*err_cause));
err_cause = (const struct sctpOpErrorCause*) bp;
cause_len = GET_BE_U_2(err_cause->causeLen);
ND_ICHECKMSG_U("cause length", cause_len, >, param_len);
ND_ICHECKMSG_ZU("cause length", cause_len, <, sizeof(*err_cause));
ND_PRINT("%s, ", tok2str(causeCode, NULL, GET_BE_U_2(err_cause->cause)));

bp += cause_len;
param_len -= cause_len;
chunkLengthRemaining -= cause_len;
}
ND_PRINT("] ");
break;
}
case SUCCESS_INDIC:
{
ND_PRINT(": C-ID: %u ", GET_BE_U_4(param->CID));
bp += sizeof(struct sctpAsconfParamRes);
param_len -= sizeof(struct sctpAsconfParamRes);
chunkLengthRemaining -= sizeof(struct sctpAsconfParamRes);
break;
}
default:
{
ND_PRINT("Unknown parameter] ");
bp += param_len;
chunkLengthRemaining -= param_len;
param_len -= param_len;
break;
}
}
}
break;
}
default :
Expand Down
8 changes: 8 additions & 0 deletions tests/TESTLIST
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,14 @@ sctp-re-config sctp-re-config.pcap sctp-re-config.out
sctp-re-config-v sctp-re-config.pcap sctp-re-config-v.out -v
sctp-re-config-vv sctp-re-config.pcap sctp-re-config-vv.out -vv

# ASCONF tests
sctp-asconf sctp-asconf.pcap sctp-asconf.out
sctp-asconf-v sctp-asconf.pcap sctp-asconf-v.out -v
sctp-asconf-vv sctp-asconf.pcap sctp-asconf-vv.out -vv
sctp-asconf-6 sctp-asconf-6.pcap sctp-asconf-6.out
sctp-asconf-6-v sctp-asconf-6.pcap sctp-asconf-6-v.out -v
sctp-asconf-6-vv sctp-asconf-6.pcap sctp-asconf-6-vv.out -vv

# BGP tests
bgp_vpn_attrset bgp_vpn_attrset.pcap bgp_vpn_attrset.out -v
mpbgp-linklocal-nexthop mpbgp-linklocal-nexthop.pcap mpbgp-linklocal-nexthop.out -v
Expand Down
36 changes: 36 additions & 0 deletions tests/sctp-asconf-6-v.out
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Original file line number Diff line number Diff line change
@@ -0,0 +1,36 @@
1 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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 2023-05-16 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
source link-address option (1), length 8 (1): f6:c7:7e:0f:83:fe
32 2023-05-16 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
source link-address option (1), length 8 (1): ae:cc:f7:c3:17:90
33 2023-05-16 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]
34 2023-05-16 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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