From Michael Tuexen:

- Support of the crc32c algorithm.
	- Selection of the checksum algorithm (none, adler-32, crc32c,
	  automatic) in the preferences/protocols menu.
	- Display of the IP address in asconf chunks.

svn path=/trunk/; revision=4548
This commit is contained in:
Guy Harris 2002-01-15 22:58:06 +00:00
parent b8157b393c
commit eb1d00480f
1 changed files with 206 additions and 48 deletions

View File

@ -4,13 +4,13 @@
* - RFC 2960, for basic SCTP support
* - http://www.ietf.org/internet-drafts/draft-ietf-tsvwg-addip-sctp-03.txt for the add-IP extension
* - http://www.sctp.org/draft-ietf-tsvwg-usctp-01.txt for the 'Limited Retransmission' extension
* Copyright 2000, Michael Tuexen <Michael.Tuexen@icn.siemens.de>
* - http://www.ietf.org/internet-drafts/draft-ietf-tsvwg-sctpcsum-01.txt
* Copyright 2000, 2001, 2002, Michael Tuexen <Michael.Tuexen@icn.siemens.de>
* Still to do (so stay tuned)
* - support for reassembly
* - support for new checksum
* - code cleanup
*
* $Id: packet-sctp.c,v 1.25 2001/12/19 20:01:56 guy Exp $
* $Id: packet-sctp.c,v 1.26 2002/01/15 22:58:06 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
@ -56,6 +56,7 @@
# include "snprintf.h"
#endif
#include "prefs.h"
#include "packet.h"
#include "ipproto.h"
@ -136,11 +137,15 @@ static int hf_sctp_asconf_correlation_id = -1;
static int hf_sctp_asconf_reserved = -1;
static int hf_sctp_asconf_addr_type = -1;
static int hf_sctp_asconf_addr = -1;
static int hf_sctp_asconf_ipv4_address = -1;
static int hf_sctp_asconf_ipv6_address = -1;
static int hf_sctp_adap_indication = -1;
static dissector_table_t sctp_port_dissector_table;
static dissector_table_t sctp_ppi_dissector_table;
static module_t *sctp_module;
/* Initialize the subtree pointers */
static gint ett_sctp = -1;
static gint ett_sctp_chunk = -1;
@ -456,6 +461,13 @@ static const true_false_string sctp_shutdown_complete_chunk_t_bit_value = {
"TCB destroyed"
};
#define SCTP_CHECKSUM_NONE 0
#define SCTP_CHECKSUM_ADLER32 1
#define SCTP_CHECKSUM_CRC32C 2
#define SCTP_CHECKSUM_AUTOMATIC 3
static gint sctp_checksum = SCTP_CHECKSUM_ADLER32;
/* adler32.c -- compute the Adler-32 checksum of a data stream
* Copyright (C) 1995-1996 Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
@ -475,8 +487,7 @@ static const true_false_string sctp_shutdown_complete_chunk_t_bit_value = {
#define DO16(buf) DO8(buf,0); DO8(buf,8);
static unsigned int
sctp_adler_32(const unsigned char* buf,
unsigned int len)
sctp_adler32(const unsigned char* buf, unsigned int len)
{
unsigned int s1 = 1L;
unsigned int s2 = 0L;
@ -514,28 +525,98 @@ sctp_adler_32(const unsigned char* buf,
return (s2 << 16) | s1;
}
static char
*sctp_checksum_state(tvbuff_t *tvb, guint orig_checksum)
{
guint length;
/* The CRC32C code is taken from the checksum draft. That code
* is copyrighted by D. Otis and has been modified.
*/
length = tvb_length(tvb);
if (orig_checksum == sctp_adler_32(tvb_get_ptr(tvb, 0, length), length))
return "correct";
else
return "incorrect";
}
static gboolean
sctp_checksum_correct(tvbuff_t *tvb, guint orig_checksum)
#define CRC32C(c,d) (c=(c>>8)^crc_c[(c^(d))&0xFF])
static unsigned long crc_c[256] =
{
0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L,
};
static unsigned int
sctp_crc32c(const unsigned char* buf, unsigned int len)
{
guint length;
length = tvb_length(tvb);
if (orig_checksum == sctp_adler_32(tvb_get_ptr(tvb, 0, length), length))
return TRUE;
else
return FALSE;
unsigned int i;
unsigned long crc32 = ~0L;
for (i = 0; i < SOURCE_PORT_LENGTH + DESTINATION_PORT_LENGTH + VERIFICATION_TAG_LENGTH; i++)
{
CRC32C(crc32, buf[i]);
}
CRC32C(crc32, 0);
CRC32C(crc32, 0);
CRC32C(crc32, 0);
CRC32C(crc32, 0);
for (i = COMMON_HEADER_LENGTH; i < len; i++)
{
CRC32C(crc32, buf[i]);
}
return crc32;
}
static guint
@ -1720,10 +1801,18 @@ dissect_forward_tsn_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *t
#define ASCONF_ADDR_LENGTH 16
#define SERIAL_NUMBER_OFFSET PARAMETER_VALUE_OFFSET
#define IP_V4_ADDRESS_TYPE 5
#define IP_V6_ADDRESS_TYPE 6
static const value_string sctp_address_type_values[] = {
{ IP_V4_ADDRESS_TYPE, "IP V4 address" },
{ IP_V6_ADDRESS_TYPE, "IP V6 address" },
{ 0, NULL } };
static void
dissect_asconf_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item)
{
guint32 serial_number, correlation_id;
guint32 serial_number, correlation_id, ipv4_address;
guint offset, length, padding_length, total_length;
guint8 addr_type;
tvbuff_t *parameter_tvb;
@ -1741,7 +1830,21 @@ dissect_asconf_chunk(tvbuff_t *chunk_tvb, packet_info *pinfo, proto_tree *tree,
addr_type = tvb_get_guint8(chunk_tvb, offset);
proto_tree_add_uint(chunk_tree, hf_sctp_asconf_addr_type, chunk_tvb, offset, ASCONF_ADDR_TYPE_LENGTH, addr_type);
offset += ASCONF_ADDR_TYPE_LENGTH;
proto_tree_add_bytes(chunk_tree, hf_sctp_asconf_addr, chunk_tvb, offset, ASCONF_ADDR_LENGTH, tvb_get_ptr(chunk_tvb, offset, ASCONF_ADDR_LENGTH));
switch (addr_type) {
case IP_V4_ADDRESS_TYPE:
tvb_memcpy(chunk_tvb, (guint8 *)&ipv4_address, offset, IPV4_ADDRESS_LENGTH);
proto_tree_add_ipv4(chunk_tree, hf_sctp_asconf_ipv4_address, chunk_tvb, offset, IPV4_ADDRESS_LENGTH, ipv4_address);
proto_tree_add_bytes(chunk_tree, hf_sctp_asconf_addr, chunk_tvb, offset + IPV4_ADDRESS_LENGTH, ASCONF_ADDR_LENGTH - IPV4_ADDRESS_LENGTH,
tvb_get_ptr(chunk_tvb, offset + IPV4_ADDRESS_LENGTH, ASCONF_ADDR_LENGTH - IPV4_ADDRESS_LENGTH));
break;
case IP_V6_ADDRESS_TYPE:
proto_tree_add_ipv6(chunk_tree, hf_sctp_asconf_ipv6_address, chunk_tvb, offset, IPV6_ADDRESS_LENGTH,
tvb_get_ptr(chunk_tvb, offset, IPV6_ADDRESS_LENGTH));
break;
default:
proto_tree_add_bytes(chunk_tree, hf_sctp_asconf_addr, chunk_tvb, offset, ASCONF_ADDR_LENGTH, tvb_get_ptr(chunk_tvb, offset, ASCONF_ADDR_LENGTH));
break;
}
offset += ASCONF_ADDR_LENGTH;
proto_item_set_text(chunk_item, "ASCONF chunk");
@ -1970,9 +2073,9 @@ static void
dissect_sctp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint16 source_port, destination_port;
guint32 verification_tag, checksum, calculated_checksum;
guint32 verification_tag, checksum, calculated_crc32c, calculated_adler32;
guint length;
gboolean checksum_correct;
gboolean crc32c_correct, adler32_correct;
proto_item *sctp_item;
proto_tree *sctp_tree;
@ -2001,23 +2104,60 @@ dissect_sctp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
/* create the sctp protocol tree */
sctp_item = proto_tree_add_item(tree, proto_sctp, tvb, 0, 0, FALSE);
sctp_tree = proto_item_add_subtree(sctp_item, ett_sctp);
/* add the components of the common header to the protocol tree */
proto_tree_add_uint(sctp_tree, hf_sctp_source_port, tvb, SOURCE_PORT_OFFSET, SOURCE_PORT_LENGTH, source_port);
proto_tree_add_uint(sctp_tree, hf_sctp_destination_port, tvb, DESTINATION_PORT_OFFSET, DESTINATION_PORT_LENGTH, destination_port);
proto_tree_add_uint(sctp_tree, hf_sctp_verification_tag, tvb, VERIFICATION_TAG_OFFSET, VERIFICATION_TAG_LENGTH, verification_tag);
length = tvb_length(tvb);
calculated_checksum = sctp_adler_32(tvb_get_ptr(tvb, 0, length), length);
checksum_correct = (checksum == calculated_checksum);
if (checksum_correct)
proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, checksum,
"Adler-32 checksum: 0x%08x (correct)", checksum);
else {
proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, checksum,
"Adler-32 checksum: 0x%08x (incorrect, should be 0x%08x)", checksum, calculated_checksum);
proto_tree_add_boolean_hidden(sctp_tree, hf_sctp_checksum_correct, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, checksum_correct);
};
switch(sctp_checksum) {
case SCTP_CHECKSUM_NONE:
proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, checksum, "Checksum: 0x%08x (not verified)", checksum);
break;
case SCTP_CHECKSUM_ADLER32:
calculated_adler32 = sctp_adler32(tvb_get_ptr(tvb, 0, length), length);
adler32_correct = (checksum == calculated_adler32);
if (adler32_correct)
proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH,
checksum, "Checksum: 0x%08x (correct Adler32)", checksum);
else
proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH,
checksum, "Checksum: 0x%08x (incorrect Adler32, should be 0x%08x)", checksum, calculated_adler32);
proto_tree_add_boolean_hidden(sctp_tree, hf_sctp_checksum_correct, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, adler32_correct);
break;
case SCTP_CHECKSUM_CRC32C:
calculated_crc32c = sctp_crc32c(tvb_get_ptr(tvb, 0, length), length);
crc32c_correct = (checksum == calculated_crc32c);
if (crc32c_correct)
proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH,
checksum, "Checksum: 0x%08x (correct CRC32C)", checksum);
else
proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH,
checksum, "Checksum: 0x%08x (incorrect CRC32C, should be 0x%08x)", checksum, calculated_crc32c);
proto_tree_add_boolean_hidden(sctp_tree, hf_sctp_checksum_correct, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, crc32c_correct);
break;
case SCTP_CHECKSUM_AUTOMATIC:
calculated_adler32 = sctp_adler32(tvb_get_ptr(tvb, 0, length), length);
adler32_correct = (checksum == calculated_adler32);
calculated_crc32c = sctp_crc32c(tvb_get_ptr(tvb, 0, length), length);
crc32c_correct = (checksum == calculated_crc32c);
if ((adler32_correct) && !(crc32c_correct))
proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH,
checksum, "Checksum: 0x%08x (correct Adler32)", checksum);
else if (!(adler32_correct) && (crc32c_correct))
proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH,
checksum, "Checksum: 0x%08x (correct CRC32C)", checksum);
else if ((adler32_correct) && (crc32c_correct))
proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH,
checksum, "Checksum: 0x%08x (correct Adler32 and CRC32C)", checksum);
else
proto_tree_add_uint_format(sctp_tree, hf_sctp_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH,
checksum, "Checksum: 0x%08x (incorrect, should be 0x%08x (Adler32) or 0x%08x (CRC32C))",
checksum, calculated_adler32, calculated_crc32c);
proto_tree_add_boolean_hidden(sctp_tree, hf_sctp_checksum_correct, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, (crc32c_correct || adler32_correct));
break;
}
} else {
sctp_tree = NULL;
sctp_item = NULL;
@ -2260,7 +2400,7 @@ proto_register_sctp(void)
},
{&hf_sctp_asconf_addr_type,
{ "Address type", "sctp.asconf.address_type",
FT_UINT8, BASE_HEX, NULL, 0x0,
FT_UINT8, BASE_HEX, VALS(sctp_address_type_values), 0x0,
"", HFILL }
},
{&hf_sctp_asconf_addr,
@ -2268,6 +2408,16 @@ proto_register_sctp(void)
FT_BYTES, BASE_NONE, NULL, 0x0,
"", HFILL }
},
{&hf_sctp_asconf_ipv4_address,
{ "IP Version 4 address", "sctp.asconf.ipv4_address",
FT_IPv4, BASE_NONE, NULL, 0x0,
"", HFILL }
},
{&hf_sctp_asconf_ipv6_address,
{ "IP Version 6 address", "sctp.asconf.ipv6_address",
FT_IPv6, BASE_NONE, NULL, 0x0,
"", HFILL }
},
{&hf_sctp_asconf_ack_serial,
{ "Serial Number", "sctp.asconf_ack.serial_number",
FT_UINT32, BASE_HEX, NULL, 0x0,
@ -2333,19 +2483,27 @@ proto_register_sctp(void)
&ett_sctp_unreliable_streams_interval
};
static enum_val_t sctp_checksum_options[] = {
{ "None", SCTP_CHECKSUM_NONE },
{ "Adler 32", SCTP_CHECKSUM_ADLER32 },
{ "CRC 32c", SCTP_CHECKSUM_CRC32C },
{ "Automatic", SCTP_CHECKSUM_AUTOMATIC},
{ NULL, 0 }
};
/* Register the protocol name and description */
proto_sctp = proto_register_protocol("Stream Control Transmission Protocol",
"SCTP", "sctp");
proto_sctp = proto_register_protocol("Stream Control Transmission Protocol", "SCTP", "sctp");
sctp_module = prefs_register_protocol(proto_sctp, NULL);
prefs_register_enum_preference(sctp_module, "checksum", "SCTP Checksum", "SCTP Checksum",
&sctp_checksum, sctp_checksum_options, FALSE);
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_sctp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* subdissector code */
sctp_port_dissector_table = register_dissector_table("sctp.port",
"SCTP port", FT_UINT16, BASE_DEC);
sctp_ppi_dissector_table = register_dissector_table("sctp.ppi",
"SCTP payload protocol identifier", FT_UINT32, BASE_HEX);
sctp_port_dissector_table = register_dissector_table("sctp.port", "SCTP port", FT_UINT16, BASE_DEC);
sctp_ppi_dissector_table = register_dissector_table("sctp.ppi", "SCTP payload protocol identifier", FT_UINT32, BASE_HEX);
};