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chunk.c
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chunk.c
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/*
*
* SCTP test tool stt.
*
* Copyright (C) 2002-2003 by Michael Tuexen
*
* Realized in co-operation between Siemens AG and the University of
* Applied Sciences, Muenster.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* There are two mailinglists available at http://www.sctp.de which should be
* used for any discussion related to this implementation.
*
* Contact: [email protected]
*
*/
#include <string.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <arpa/inet.h>
#include <sys/param.h>
#include <libguile.h>
#include "common.h"
#include "tlv.h"
extern scm_t_bits parameter_tag;
extern scm_t_bits cause_tag;
scm_t_bits chunk_tag;
struct data_chunk {
scm_t_uint8 type;
scm_t_uint8 flags;
scm_t_uint16 length;
scm_t_uint32 tsn;
scm_t_uint16 sid;
scm_t_uint16 ssn;
scm_t_uint32 ppi;
scm_t_uint8 user_data[0];
}__attribute__((packed));
struct ndata_chunk {
scm_t_uint8 type;
scm_t_uint8 flags;
scm_t_uint16 length;
scm_t_uint32 tsn;
scm_t_uint16 sid;
scm_t_uint16 ssn;
scm_t_uint32 ppi;
scm_t_uint32 mid;
scm_t_uint32 fsn;
scm_t_uint8 user_data[0];
}__attribute__((packed));
struct init_chunk {
scm_t_uint8 type;
scm_t_uint8 flags;
scm_t_uint16 length;
scm_t_uint32 initiate_tag;
scm_t_uint32 a_rwnd;
scm_t_uint16 mos;
scm_t_uint16 mis;
scm_t_uint32 initial_tsn;
scm_t_uint8 parameter[0];
}__attribute__((packed));
struct init_ack_chunk {
scm_t_uint8 type;
scm_t_uint8 flags;
scm_t_uint16 length;
scm_t_uint32 initiate_tag;
scm_t_uint32 a_rwnd;
scm_t_uint16 mos;
scm_t_uint16 mis;
scm_t_uint32 initial_tsn;
scm_t_uint8 parameter[0];
}__attribute__((packed));
struct sack_chunk {
scm_t_uint8 type;
scm_t_uint8 flags;
scm_t_uint16 length;
scm_t_uint32 cum_tsn_ack;
scm_t_uint32 a_rwnd;
scm_t_uint16 nr_of_gaps;
scm_t_uint16 nr_of_dups;
scm_t_uint8 tsns[0];
}__attribute__((packed));
struct nr_sack_chunk {
scm_t_uint8 type;
scm_t_uint8 flags;
scm_t_uint16 length;
scm_t_uint32 cum_tsn_ack;
scm_t_uint32 a_rwnd;
scm_t_uint16 nr_of_gaps;
scm_t_uint16 nr_of_nr_gaps;
scm_t_uint16 nr_of_dups;
scm_t_uint16 reserved;
scm_t_uint8 tsns[0];
}__attribute__((packed));
struct shutdown_chunk {
scm_t_uint8 type;
scm_t_uint8 flags;
scm_t_uint16 length;
scm_t_uint32 cumulative_tsn_ack;
}__attribute__((packed));
struct cookie_echo_chunk {
scm_t_uint8 type;
scm_t_uint8 flags;
scm_t_uint16 length;
scm_t_uint8 state_cookie[0];
}__attribute__((packed));
struct ecn_chunk {
scm_t_uint8 type;
scm_t_uint8 flags;
scm_t_uint16 length;
scm_t_uint32 lowest_tsn;
}__attribute__((packed));
struct error_chunk {
scm_t_uint8 type;
scm_t_uint8 flags;
scm_t_uint16 length;
scm_t_uint8 error_causes[0];
};
struct abort_chunk {
scm_t_uint8 type;
scm_t_uint8 flags;
scm_t_uint16 length;
scm_t_uint8 error_causes[0];
}__attribute__((packed));
struct forward_tsn_chunk {
scm_t_uint8 type;
scm_t_uint8 flags;
scm_t_uint16 length;
scm_t_uint32 cum_tsn;
scm_t_uint8 stream_info[0];
}__attribute__((packed));
struct asconf_chunk {
scm_t_uint8 type;
scm_t_uint8 flags;
scm_t_uint16 length;
scm_t_uint32 serial;
scm_t_uint8 parameters[0];
}__attribute__((packed));
#define UNORDERED_BIT 0x04
#define BEGIN_BIT 0x02
#define END_BIT 0x01
#define T_BIT 0x01
#define DATA_CHUNK_HEADER_LENGTH 16
#define INIT_CHUNK_HEADER_LENGTH 20
#define INIT_ACK_CHUNK_HEADER_LENGTH 20
#define MIN_SACK_CHUNK_LENGTH 16
#define MIN_NR_SACK_CHUNK_LENGTH 20
#define ABORT_CHUNK_HEADER_LENGTH 4
#define SHUTDOWN_ACK_CHUNK_LENGTH 4
#define COOKIE_ACK_CHUNK_LENGTH 4
#define SHUTDOWN_CHUNK_LENGTH 8
#define SHUTDOWN_COMPLETE_CHUNK_LENGTH 4
#define ERROR_CHUNK_HEADER_LENGTH 4
#define ECNE_CHUNK_LENGTH 8
#define CWR_CHUNK_LENGTH 8
#define FORWARD_TSN_CHUNK_LENGTH 8
#define ASCONF_CHUNK_HEADER_LENGTH 8
#define NDATA_CHUNK_HEADER_LENGTH 24
static SCM
make_data_chunk(SCM s_tsn, SCM s_sid, SCM s_ssn, SCM s_ppi, SCM s_user_data, SCM s_unordered, SCM s_begin, SCM s_end)
{
struct data_chunk *data_chunk;
scm_t_uint16 sid, ssn;
scm_t_uint32 tsn, ppi;
scm_t_uint16 user_data_length;
scm_t_uint16 total_length;
size_t i;
if SCM_UNBNDP(s_unordered) {
s_unordered = SCM_BOOL_F;
}
if SCM_UNBNDP(s_begin) {
s_begin = SCM_BOOL_T;
}
if SCM_UNBNDP(s_end) {
s_end = SCM_BOOL_T;
}
tsn = scm_to_uint32(s_tsn);
sid = scm_to_uint16(s_sid);
ssn = scm_to_uint16(s_ssn);
ppi = scm_to_uint32(s_ppi);
SCM_ASSERT(scm_is_vector(s_user_data), s_user_data, SCM_ARG5, "make-data-chunk");
SCM_ASSERT(scm_is_bool(s_unordered), s_unordered, SCM_ARG6, "make-data-chunk");
SCM_ASSERT(scm_is_bool(s_begin), s_begin, SCM_ARG7, "make-data-chunk");
SCM_ASSERT(scm_is_bool(s_end), s_end, SCM_ARGn, "make-data-chunk");
user_data_length = scm_c_vector_length(s_user_data);
if (user_data_length > (MAX_CHUNK_LENGTH - DATA_CHUNK_HEADER_LENGTH)) {
scm_num_overflow("make-data-chunk");
}
total_length = ADD_PADDING(DATA_CHUNK_HEADER_LENGTH + user_data_length);
data_chunk = (struct data_chunk *)scm_gc_malloc(total_length, "chunk");
memset((void *) data_chunk, 0, total_length);
data_chunk->type = DATA_CHUNK_TYPE;
data_chunk->flags = 0;
if (scm_is_true(s_unordered)) {
data_chunk->flags |= UNORDERED_BIT;
}
if (scm_is_true(s_begin)) {
data_chunk->flags |= BEGIN_BIT;
}
if (scm_is_true(s_end)) {
data_chunk->flags |= END_BIT;
}
data_chunk->length = htons(DATA_CHUNK_HEADER_LENGTH + user_data_length);
data_chunk->tsn = htonl(tsn);
data_chunk->sid = htons(sid);
data_chunk->ssn = htons(ssn);
data_chunk->ppi = htonl(ppi);
for (i = 0; i < user_data_length; i++) {
data_chunk->user_data[i] = scm_to_uint8(SCM_SIMPLE_VECTOR_REF(s_user_data, i));
}
SCM_RETURN_NEWSMOB(chunk_tag, data_chunk);
}
static SCM
make_ndata_chunk(SCM s_tsn, SCM s_sid, SCM s_ssn, SCM s_ppi, SCM s_mid, SCM s_fsn, SCM s_user_data, SCM s_unordered, SCM s_begin, SCM s_end)
{
struct ndata_chunk *ndata_chunk;
scm_t_uint16 sid, ssn;
scm_t_uint32 tsn, ppi, mid, fsn;
scm_t_uint16 user_data_length;
scm_t_uint16 total_length;
size_t i;
if SCM_UNBNDP(s_unordered) {
s_unordered = SCM_BOOL_F;
}
if SCM_UNBNDP(s_begin) {
s_begin = SCM_BOOL_T;
}
if SCM_UNBNDP(s_end) {
s_end = SCM_BOOL_T;
}
tsn = scm_to_uint32(s_tsn);
sid = scm_to_uint16(s_sid);
ssn = scm_to_uint16(s_ssn);
ppi = scm_to_uint32(s_ppi);
mid = scm_to_uint32(s_mid);
fsn = scm_to_uint32(s_fsn);
SCM_ASSERT(scm_is_vector(s_user_data), s_user_data, SCM_ARG5, "make-ndata-chunk");
SCM_ASSERT(scm_is_bool(s_unordered), s_unordered, SCM_ARG6, "make-ndata-chunk");
SCM_ASSERT(scm_is_bool(s_begin), s_begin, SCM_ARG7, "make-ndata-chunk");
SCM_ASSERT(scm_is_bool(s_end), s_end, SCM_ARGn, "make-ndata-chunk");
user_data_length = scm_c_vector_length(s_user_data);
if (user_data_length > (MAX_CHUNK_LENGTH - NDATA_CHUNK_HEADER_LENGTH)) {
scm_num_overflow("make-ndata-chunk");
}
total_length = ADD_PADDING(NDATA_CHUNK_HEADER_LENGTH + user_data_length);
ndata_chunk = (struct ndata_chunk *)scm_gc_malloc(total_length, "chunk");
memset((void *) ndata_chunk, 0, total_length);
ndata_chunk->type = NDATA_CHUNK_TYPE;
ndata_chunk->flags = 0;
if (scm_is_true(s_unordered)) {
ndata_chunk->flags |= UNORDERED_BIT;
}
if (scm_is_true(s_begin)) {
ndata_chunk->flags |= BEGIN_BIT;
}
if (scm_is_true(s_end)) {
ndata_chunk->flags |= END_BIT;
}
ndata_chunk->length = htons(NDATA_CHUNK_HEADER_LENGTH + user_data_length);
ndata_chunk->tsn = htonl(tsn);
ndata_chunk->sid = htons(sid);
ndata_chunk->ssn = htons(ssn);
ndata_chunk->ppi = htonl(ppi);
ndata_chunk->mid = htonl(mid);
ndata_chunk->fsn = htonl(fsn);
for (i = 0; i < user_data_length; i++) {
ndata_chunk->user_data[i] = scm_to_uint8(SCM_SIMPLE_VECTOR_REF(s_user_data, i));
}
SCM_RETURN_NEWSMOB(chunk_tag, ndata_chunk);
}
static SCM
get_tsn(SCM chunk_smob)
{
struct data_chunk *data_chunk;
scm_assert_smob_type(chunk_tag, chunk_smob);
data_chunk = (struct data_chunk *)SCM_SMOB_DATA(chunk_smob);
if ((data_chunk->type != DATA_CHUNK_TYPE) &&
(data_chunk->type != NDATA_CHUNK_TYPE)) {
scm_syserror_msg ("get-tsn", "incorrect chunk type", chunk_smob, 0);
}
if (((data_chunk->type == DATA_CHUNK_TYPE) &&
(ntohs(data_chunk->length) < DATA_CHUNK_HEADER_LENGTH)) ||
((data_chunk->type == NDATA_CHUNK_TYPE) &&
(ntohs(data_chunk->length) < NDATA_CHUNK_HEADER_LENGTH))) {
scm_syserror_msg ("get-tsn", "incorrect chunk length", chunk_smob, 0);
}
return scm_from_uint32(ntohl(data_chunk->tsn));
}
static SCM
get_sid(SCM chunk_smob)
{
struct data_chunk *data_chunk;
scm_assert_smob_type(chunk_tag, chunk_smob);
data_chunk = (struct data_chunk *)SCM_SMOB_DATA(chunk_smob);
if ((data_chunk->type != DATA_CHUNK_TYPE) &&
(data_chunk->type != NDATA_CHUNK_TYPE)) {
scm_syserror_msg ("get-sid", "incorrect chunk type", chunk_smob, 0);
}
if (((data_chunk->type == DATA_CHUNK_TYPE) &&
(ntohs(data_chunk->length) < DATA_CHUNK_HEADER_LENGTH)) ||
((data_chunk->type == NDATA_CHUNK_TYPE) &&
(ntohs(data_chunk->length) < NDATA_CHUNK_HEADER_LENGTH))) {
scm_syserror_msg ("get-sid", "incorrect chunk length", chunk_smob, 0);
}
return scm_from_uint16(ntohs(data_chunk->sid));
}
static SCM
get_ssn(SCM chunk_smob)
{
struct data_chunk *data_chunk;
scm_assert_smob_type(chunk_tag, chunk_smob);
data_chunk = (struct data_chunk *)SCM_SMOB_DATA(chunk_smob);
if ((data_chunk->type != DATA_CHUNK_TYPE) &&
(data_chunk->type != NDATA_CHUNK_TYPE)) {
scm_syserror_msg ("get-ssn", "incorrect chunk type", chunk_smob, 0);
}
if (((data_chunk->type == DATA_CHUNK_TYPE) &&
(ntohs(data_chunk->length) < DATA_CHUNK_HEADER_LENGTH)) ||
((data_chunk->type == NDATA_CHUNK_TYPE) &&
(ntohs(data_chunk->length) < NDATA_CHUNK_HEADER_LENGTH))) {
scm_syserror_msg ("get-ssn", "incorrect chunk length", chunk_smob, 0);
}
return scm_from_uint16(ntohs(data_chunk->ssn));
}
static SCM
get_ppi(SCM chunk_smob)
{
struct data_chunk *data_chunk;
scm_assert_smob_type(chunk_tag, chunk_smob);
data_chunk = (struct data_chunk *)SCM_SMOB_DATA(chunk_smob);
if ((data_chunk->type != DATA_CHUNK_TYPE) &&
(data_chunk->type != NDATA_CHUNK_TYPE)) {
scm_syserror_msg ("get-ppi", "incorrect chunk type", chunk_smob, 0);
}
if (((data_chunk->type == DATA_CHUNK_TYPE) &&
(ntohs(data_chunk->length) < DATA_CHUNK_HEADER_LENGTH)) ||
((data_chunk->type == NDATA_CHUNK_TYPE) &&
(ntohs(data_chunk->length) < NDATA_CHUNK_HEADER_LENGTH))) {
scm_syserror_msg ("get-ppi", "incorrect chunk length", chunk_smob, 0);
}
return scm_from_uint32(ntohl(data_chunk->ppi));
}
static SCM
get_mid(SCM chunk_smob)
{
struct ndata_chunk *ndata_chunk;
scm_assert_smob_type(chunk_tag, chunk_smob);
ndata_chunk = (struct ndata_chunk *)SCM_SMOB_DATA(chunk_smob);
if (ndata_chunk->type != NDATA_CHUNK_TYPE) {
scm_syserror_msg ("get-tsn", "incorrect chunk type", chunk_smob, 0);
}
if (ntohs(ndata_chunk->length) < NDATA_CHUNK_HEADER_LENGTH) {
scm_syserror_msg ("get-tsn", "incorrect chunk length", chunk_smob, 0);
}
return scm_from_uint32(ntohl(ndata_chunk->mid));
}
static SCM
get_fsn(SCM chunk_smob)
{
struct ndata_chunk *ndata_chunk;
scm_assert_smob_type(chunk_tag, chunk_smob);
ndata_chunk = (struct ndata_chunk *)SCM_SMOB_DATA(chunk_smob);
if (ndata_chunk->type != NDATA_CHUNK_TYPE) {
scm_syserror_msg ("get-tsn", "incorrect chunk type", chunk_smob, 0);
}
if (ntohs(ndata_chunk->length) < NDATA_CHUNK_HEADER_LENGTH) {
scm_syserror_msg ("get-tsn", "incorrect chunk length", chunk_smob, 0);
}
return scm_from_uint32(ntohl(ndata_chunk->fsn));
}
static SCM
get_user_data(SCM chunk_smob)
{
struct data_chunk *data_chunk;
SCM s_user_data;
size_t i, length;
scm_assert_smob_type(chunk_tag, chunk_smob);
data_chunk = (struct data_chunk *)SCM_SMOB_DATA(chunk_smob);
if ((data_chunk->type != DATA_CHUNK_TYPE) &&
(data_chunk->type != NDATA_CHUNK_TYPE)) {
scm_syserror_msg ("get-user-data", "incorrect chunk type", chunk_smob, 0);
}
if (((data_chunk->type == DATA_CHUNK_TYPE) &&
(ntohs(data_chunk->length) < DATA_CHUNK_HEADER_LENGTH)) ||
((data_chunk->type == NDATA_CHUNK_TYPE) &&
(ntohs(data_chunk->length) < NDATA_CHUNK_HEADER_LENGTH))) {
scm_syserror_msg ("get-user-data", "incorrect chunk length", chunk_smob, 0);
}
if (data_chunk->type == DATA_CHUNK_TYPE) {
length = ntohs(data_chunk->length) - DATA_CHUNK_HEADER_LENGTH;
} else {
length = ntohs(data_chunk->length) - NDATA_CHUNK_HEADER_LENGTH;
}
s_user_data = scm_c_make_vector(length, SCM_UNSPECIFIED);
for (i = 0; i < length; i++) {
SCM_SIMPLE_VECTOR_SET(s_user_data, i, scm_from_uint8(data_chunk->user_data[i]));
}
return s_user_data;
}
static SCM
get_u_bit(SCM chunk_smob)
{
struct chunk *chunk;
scm_assert_smob_type(chunk_tag, chunk_smob);
chunk = (struct chunk *)SCM_SMOB_DATA(chunk_smob);
if ((chunk->type != DATA_CHUNK_TYPE) &&
(chunk->type != NDATA_CHUNK_TYPE)) {
scm_syserror_msg ("get-u-bit", "incorrect chunk type", chunk_smob, 0);
}
if (((chunk->type == DATA_CHUNK_TYPE) &&
(ntohs(chunk->length) < DATA_CHUNK_HEADER_LENGTH)) ||
((chunk->type == NDATA_CHUNK_TYPE) &&
(ntohs(chunk->length) < NDATA_CHUNK_HEADER_LENGTH))) {
scm_syserror_msg ("get-u-bit", "incorrect chunk length", chunk_smob, 0);
}
if ((chunk->flags) & UNORDERED_BIT) {
return SCM_BOOL_T;
} else {
return SCM_BOOL_F;
}
}
static SCM
get_e_bit(SCM chunk_smob)
{
struct chunk *chunk;
scm_assert_smob_type(chunk_tag, chunk_smob);
chunk = (struct chunk *)SCM_SMOB_DATA(chunk_smob);
if ((chunk->type != DATA_CHUNK_TYPE) &&
(chunk->type != NDATA_CHUNK_TYPE)) {
scm_syserror_msg ("get-e-bit", "incorrect chunk type", chunk_smob, 0);
}
if (((chunk->type == DATA_CHUNK_TYPE) &&
(ntohs(chunk->length) < DATA_CHUNK_HEADER_LENGTH)) ||
((chunk->type == NDATA_CHUNK_TYPE) &&
(ntohs(chunk->length) < NDATA_CHUNK_HEADER_LENGTH))) {
scm_syserror_msg ("get-e-bit", "incorrect chunk length", chunk_smob, 0);
}
if ((chunk->flags) & END_BIT) {
return SCM_BOOL_T;
} else {
return SCM_BOOL_F;
}
}
static SCM
get_b_bit(SCM chunk_smob)
{
struct chunk *chunk;
scm_assert_smob_type(chunk_tag, chunk_smob);
chunk = (struct chunk *)SCM_SMOB_DATA(chunk_smob);
if ((chunk->type != DATA_CHUNK_TYPE) &&
(chunk->type != NDATA_CHUNK_TYPE)) {
scm_syserror_msg ("get-b-bit", "incorrect chunk type", chunk_smob, 0);
}
if (((chunk->type == DATA_CHUNK_TYPE) &&
(ntohs(chunk->length) < DATA_CHUNK_HEADER_LENGTH)) ||
((chunk->type == NDATA_CHUNK_TYPE) &&
(ntohs(chunk->length) < NDATA_CHUNK_HEADER_LENGTH))) {
scm_syserror_msg ("get-b-bit", "incorrect chunk length", chunk_smob, 0);
}
if ((chunk->flags) & BEGIN_BIT) {
return SCM_BOOL_T;
} else {
return SCM_BOOL_F;
}
}
SCM
make_init_chunk(SCM s_init_tag, SCM s_a_rwnd, SCM s_MOS, SCM s_MIS, SCM s_init_TSN, SCM s_parameters)
{
struct init_chunk *init_chunk;
scm_t_uint16 mos, mis;
scm_t_uint32 initiate_tag, a_rwnd, initial_tsn;
size_t number_of_parameters, parameter_number;
scm_t_uint16 chunk_length, total_length, length, parameter_length, offset;
SCM s_parameter;
initiate_tag = scm_to_uint32(s_init_tag);
a_rwnd = scm_to_uint32(s_a_rwnd);
mos = scm_to_uint16(s_MOS);
mis = scm_to_uint16(s_MIS);
initial_tsn = scm_to_uint32(s_init_TSN);
chunk_length = INIT_CHUNK_HEADER_LENGTH;
SCM_ASSERT(scm_is_vector(s_parameters) , s_parameters, SCM_ARG6, "make-init-chunk");
parameter_length = 0;
number_of_parameters = scm_c_vector_length(s_parameters);
for (parameter_number = 0; parameter_number < number_of_parameters; parameter_number++) {
if (parameter_number > 0) {
chunk_length += ADD_PADDING(parameter_length);
}
s_parameter = SCM_SIMPLE_VECTOR_REF(s_parameters, parameter_number);
scm_assert_smob_type(parameter_tag, s_parameter);
parameter_length = ntohs(((struct parameter *)SCM_SMOB_DATA(s_parameter))->length);
if ((MAX_CHUNK_DATA_LENGTH - chunk_length) < parameter_length) {
scm_out_of_range("make-init-chunk", s_parameter);
}
}
chunk_length += parameter_length;
total_length = ADD_PADDING(chunk_length);
init_chunk = (struct init_chunk *)scm_gc_malloc(total_length, "chunk");
memset((void *)init_chunk, 0, total_length);
init_chunk->type = INIT_CHUNK_TYPE;
init_chunk->flags = 0;
init_chunk->length = htons(chunk_length);
init_chunk->initiate_tag = htonl(initiate_tag);
init_chunk->a_rwnd = htonl(a_rwnd);
init_chunk->mos = htons(mos);
init_chunk->mis = htons(mis);
init_chunk->initial_tsn = htonl(initial_tsn);
offset = 0;
for (parameter_number = 0; parameter_number < number_of_parameters; parameter_number++) {
s_parameter = SCM_SIMPLE_VECTOR_REF(s_parameters, parameter_number);
length = ADD_PADDING(ntohs(((struct parameter *) SCM_SMOB_DATA (s_parameter))->length));
memcpy((void *)(init_chunk->parameter + offset), (const void *)(SCM_SMOB_DATA (s_parameter)), length);
offset += length;
}
SCM_RETURN_NEWSMOB(chunk_tag, init_chunk);
}
SCM
make_init_ack_chunk(SCM s_init_tag, SCM s_a_rwnd, SCM s_MOS, SCM s_MIS, SCM s_init_TSN, SCM s_parameters)
{
struct init_ack_chunk *init_ack_chunk;
scm_t_uint16 mos, mis;
scm_t_uint32 initiate_tag, a_rwnd, initial_tsn;
size_t number_of_parameters, parameter_number;
scm_t_uint16 chunk_length, total_length, length, parameter_length, offset;
SCM s_parameter;
initiate_tag = scm_to_uint32(s_init_tag);
a_rwnd = scm_to_uint32(s_a_rwnd);
mos = scm_to_uint16(s_MOS);
mis = scm_to_uint16(s_MIS);
initial_tsn = scm_to_uint32(s_init_TSN);
chunk_length = INIT_ACK_CHUNK_HEADER_LENGTH;
SCM_ASSERT(scm_is_vector(s_parameters) , s_parameters, SCM_ARG6, "make-init-ack-chunk");
parameter_length = 0;
number_of_parameters = scm_c_vector_length(s_parameters);
for (parameter_number = 0; parameter_number < number_of_parameters; parameter_number++) {
if (parameter_number > 0) {
chunk_length += ADD_PADDING(parameter_length);
}
s_parameter = SCM_SIMPLE_VECTOR_REF(s_parameters, parameter_number);
scm_assert_smob_type(parameter_tag, s_parameter);
parameter_length = ntohs(((struct parameter *)SCM_SMOB_DATA(s_parameter))->length);
if ((MAX_CHUNK_DATA_LENGTH - chunk_length) < parameter_length) {
scm_out_of_range("make-init-ack-chunk", s_parameter);
}
}
chunk_length += parameter_length;
total_length = ADD_PADDING(chunk_length);
init_ack_chunk = (struct init_ack_chunk *)scm_gc_malloc(total_length, "chunk");
memset((void *) init_ack_chunk, 0, total_length);
init_ack_chunk->type = INIT_ACK_CHUNK_TYPE;
init_ack_chunk->flags = 0;
init_ack_chunk->length = htons(chunk_length);
init_ack_chunk->initiate_tag = htonl(initiate_tag);
init_ack_chunk->a_rwnd = htonl(a_rwnd);
init_ack_chunk->mos = htons(mos);
init_ack_chunk->mis = htons(mis);
init_ack_chunk->initial_tsn = htonl(initial_tsn);
offset = 0;
for (parameter_number = 0; parameter_number < number_of_parameters; parameter_number++) {
s_parameter = SCM_SIMPLE_VECTOR_REF(s_parameters, parameter_number);
length = ADD_PADDING(ntohs(((struct parameter *)SCM_SMOB_DATA(s_parameter))->length));
memcpy((void *)(init_ack_chunk->parameter + offset), (const void *)(SCM_SMOB_DATA(s_parameter)), length);
offset += length;
}
SCM_RETURN_NEWSMOB(chunk_tag, init_ack_chunk);
}
static SCM
get_initiate_tag(SCM chunk_smob)
{
struct init_chunk *chunk;
scm_assert_smob_type(chunk_tag, chunk_smob);
chunk = (struct init_chunk *)SCM_SMOB_DATA(chunk_smob);
if ((chunk-> type != INIT_CHUNK_TYPE) &&
(chunk-> type != INIT_ACK_CHUNK_TYPE)) {
scm_syserror_msg ("get-initiate-tag", "incorrect chunk type", chunk_smob, 0);
}
if (ntohs(chunk-> length) < INIT_CHUNK_HEADER_LENGTH) {
scm_syserror_msg ("get-initiate-tag", "incorrect chunk length", chunk_smob, 0);
}
return scm_from_uint32(ntohl(chunk->initiate_tag));
}
static SCM
get_a_rwnd(SCM chunk_smob)
{
struct init_chunk *chunk;
scm_assert_smob_type(chunk_tag, chunk_smob);
chunk = (struct init_chunk *)SCM_SMOB_DATA(chunk_smob);
if ((chunk->type != INIT_CHUNK_TYPE) &&
(chunk->type != INIT_ACK_CHUNK_TYPE) &&
(chunk->type != SACK_CHUNK_TYPE) &&
(chunk->type != NR_SACK_CHUNK_TYPE)) {
scm_syserror_msg ("get-a-rwnd", "incorrect chunk type", chunk_smob, 0);
}
if (ntohs(chunk-> length) < INIT_CHUNK_HEADER_LENGTH) {
scm_syserror_msg ("get-a-rwnd", "incorrect chunk length", chunk_smob, 0);
}
return scm_from_uint32(ntohl(chunk->a_rwnd));
}
static SCM
get_mos(SCM chunk_smob)
{
struct init_chunk *chunk;
scm_assert_smob_type(chunk_tag, chunk_smob);
chunk = (struct init_chunk *)SCM_SMOB_DATA(chunk_smob);
if ((chunk-> type != INIT_CHUNK_TYPE) &&
(chunk-> type != INIT_ACK_CHUNK_TYPE)) {
scm_syserror_msg ("get-mos", "incorrect chunk type", chunk_smob, 0);
}
if (ntohs(chunk-> length) < INIT_CHUNK_HEADER_LENGTH) {
scm_syserror_msg ("get-mos", "incorrect chunk length", chunk_smob, 0);
}
return scm_from_uint16(ntohs(chunk->mos));
}
static SCM
get_mis(SCM chunk_smob)
{
struct init_chunk *chunk;
scm_assert_smob_type(chunk_tag, chunk_smob);
chunk = (struct init_chunk *)SCM_SMOB_DATA(chunk_smob);
if ((chunk-> type != INIT_CHUNK_TYPE) &&
(chunk-> type != INIT_ACK_CHUNK_TYPE)) {
scm_syserror_msg ("get-mis", "incorrect chunk type", chunk_smob, 0);
}
if (ntohs(chunk-> length) < INIT_CHUNK_HEADER_LENGTH) {
scm_syserror_msg ("get-mis", "incorrect chunk length", chunk_smob, 0);
}
return scm_from_uint16(ntohs(chunk->mis));
}
static SCM
get_initial_tsn (SCM chunk_smob)
{
struct init_chunk *chunk;
scm_assert_smob_type(chunk_tag, chunk_smob);
chunk = (struct init_chunk *)SCM_SMOB_DATA(chunk_smob);
if ((chunk-> type != INIT_CHUNK_TYPE) &&
(chunk-> type != INIT_ACK_CHUNK_TYPE)) {
scm_syserror_msg ("get-initial-tsn", "incorrect chunk type", chunk_smob, 0);
}
if (ntohs(chunk-> length) < INIT_CHUNK_HEADER_LENGTH) {
scm_syserror_msg ("get-initial-tsn", "incorrect chunk length", chunk_smob, 0);
}
return scm_from_uint32(ntohl(chunk->initial_tsn));
}
static SCM
get_parameters(SCM chunk_smob)
{
struct chunk *chunk;
scm_t_uint16 parameters_length;
scm_assert_smob_type(chunk_tag, chunk_smob);
chunk = (struct chunk *)SCM_SMOB_DATA(chunk_smob);
if ((chunk-> type != INIT_CHUNK_TYPE) &&
(chunk-> type != INIT_ACK_CHUNK_TYPE) &&
(chunk-> type != ASCONF_CHUNK_TYPE) &&
(chunk-> type != ASCONF_ACK_CHUNK_TYPE)) {
scm_syserror_msg ("get-parameters", "incorrect chunk type", chunk_smob, 0);
}
if ((chunk->type == INIT_CHUNK_TYPE) || (chunk->type == INIT_ACK_CHUNK_TYPE)) {
if (ntohs(chunk->length) < INIT_CHUNK_HEADER_LENGTH) {
scm_syserror_msg ("get-parameters", "incorrect chunk length", chunk_smob, 0);
}
parameters_length = ntohs(chunk->length) - INIT_CHUNK_HEADER_LENGTH;
return get_tlv_list(((struct init_chunk *)chunk)->parameter, parameters_length, "parameter", parameter_tag);
} else {
if (ntohs(chunk->length) < CHUNK_HEADER_LENGTH + 4) {
scm_syserror_msg ("get-parameters", "incorrect chunk length", chunk_smob, 0);
}
parameters_length = ntohs(chunk->length) - CHUNK_HEADER_LENGTH - 4;
return get_tlv_list(((struct asconf_chunk *)chunk)->parameters, parameters_length, "parameter", parameter_tag);
}
}
static SCM
make_sack_chunk(SCM s_cum_tsn_ack, SCM s_a_rwnd, SCM s_gaps, SCM s_dup_tsns, SCM s_nr_of_gaps, SCM s_nr_of_dups)
{
struct sack_chunk *sack_chunk;
scm_t_uint32 cum_tsn_ack, a_rwnd, length, dup;
scm_t_uint16 nr_of_gaps, nr_of_dups, start, end, offset;
size_t i;
SCM s_block;
cum_tsn_ack = scm_to_uint32(s_cum_tsn_ack);
a_rwnd = scm_to_uint32(s_a_rwnd);
SCM_ASSERT(scm_is_vector(s_gaps), s_gaps, SCM_ARG3, "make-sack-chunk");
SCM_ASSERT(scm_is_vector(s_dup_tsns), s_dup_tsns, SCM_ARG4, "make-sack-chunk");
if SCM_UNBNDP(s_nr_of_gaps) {
nr_of_gaps = scm_c_vector_length(s_gaps);
} else {
nr_of_gaps = scm_to_uint16(s_nr_of_gaps);
}
if SCM_UNBNDP(s_nr_of_dups) {
nr_of_dups = scm_c_vector_length(s_dup_tsns);
} else {
nr_of_dups = scm_to_uint16(s_nr_of_dups);
}
length = 16 + 4 * (scm_c_vector_length(s_gaps) + scm_c_vector_length(s_dup_tsns));
sack_chunk = (struct sack_chunk *)scm_gc_malloc(length, "chunk");
memset((void *)sack_chunk, 0, length);
sack_chunk->type = SACK_CHUNK_TYPE;
sack_chunk->flags = 0;
sack_chunk->length = htons(length);
sack_chunk->cum_tsn_ack = htonl(cum_tsn_ack);
sack_chunk->a_rwnd = htonl(a_rwnd);
sack_chunk->nr_of_gaps = htons(nr_of_gaps);
sack_chunk->nr_of_dups = htons(nr_of_dups);
offset = 0;
for (i = 0; i < scm_c_vector_length(s_gaps); i++) {
s_block = SCM_SIMPLE_VECTOR_REF(s_gaps, i);
SCM_ASSERT(scm_is_vector(s_block), s_block, SCM_ARGn, "make-sack-chunk");
if (scm_c_vector_length(s_block) != 2) {
scm_out_of_range("make-sack-chunk", s_block);
}
start = htons(scm_to_uint16(SCM_SIMPLE_VECTOR_REF(s_block, 0)));
end = htons(scm_to_uint16(SCM_SIMPLE_VECTOR_REF(s_block, 1)));
memcpy((void *)(sack_chunk->tsns + offset), (const void *)&start, 2);
offset += 2;
memcpy((void *)(sack_chunk->tsns + offset), (const void *)&end, 2);
offset += 2;
}
for (i = 0; i < scm_c_vector_length(s_dup_tsns); i++) {
dup = htonl(scm_to_uint32(SCM_SIMPLE_VECTOR_REF(s_dup_tsns, i)));
memcpy((void *)(sack_chunk->tsns + offset), (const void *)&dup, 4);
offset += 4;
}
SCM_RETURN_NEWSMOB(chunk_tag, sack_chunk);
}
static SCM
make_nr_sack_chunk(SCM s_cum_tsn_ack, SCM s_a_rwnd, SCM s_gaps, SCM s_nr_gaps, SCM s_dup_tsns, SCM s_nr_of_gaps, SCM s_nr_of_nr_gaps, SCM s_nr_of_dups)
{
struct nr_sack_chunk *nr_sack_chunk;
scm_t_uint32 cum_tsn_ack, a_rwnd, length, dup;
scm_t_uint16 nr_of_gaps, nr_of_nr_gaps, nr_of_dups, start, end, offset;
size_t i;
SCM s_block;
cum_tsn_ack = scm_to_uint32(s_cum_tsn_ack);
a_rwnd = scm_to_uint32(s_a_rwnd);
SCM_ASSERT(scm_is_vector(s_gaps), s_gaps, SCM_ARG3, "make-nr-sack-chunk");
SCM_ASSERT(scm_is_vector(s_nr_gaps), s_gaps, SCM_ARG4, "make-nr-sack-chunk");
SCM_ASSERT(scm_is_vector(s_dup_tsns), s_dup_tsns, SCM_ARG5, "make-nr-sack-chunk");
if SCM_UNBNDP(s_nr_of_gaps) {
nr_of_gaps = scm_c_vector_length(s_gaps);
} else {
nr_of_gaps = scm_to_uint16(s_nr_of_gaps);
}
if SCM_UNBNDP(s_nr_of_nr_gaps) {
nr_of_nr_gaps = scm_c_vector_length(s_nr_gaps);
} else {
nr_of_nr_gaps = scm_to_uint16(s_nr_of_nr_gaps);
}
if SCM_UNBNDP(s_nr_of_dups) {
nr_of_dups = scm_c_vector_length(s_dup_tsns);
} else {
nr_of_dups = scm_to_uint16(s_nr_of_dups);
}
length = 20 + 4 * (scm_c_vector_length(s_gaps) +
scm_c_vector_length(s_nr_gaps) +
scm_c_vector_length(s_dup_tsns));
nr_sack_chunk = (struct nr_sack_chunk *)scm_gc_malloc(length, "chunk");
memset((void *)nr_sack_chunk, 0, length);
nr_sack_chunk->type = NR_SACK_CHUNK_TYPE;
nr_sack_chunk->flags = 0;
nr_sack_chunk->length = htons(length);
nr_sack_chunk->cum_tsn_ack = htonl(cum_tsn_ack);
nr_sack_chunk->a_rwnd = htonl(a_rwnd);
nr_sack_chunk->nr_of_gaps = htons(nr_of_gaps);
nr_sack_chunk->nr_of_nr_gaps = htons(nr_of_nr_gaps);
nr_sack_chunk->nr_of_dups = htons(nr_of_dups);
offset = 0;
for (i = 0; i < scm_c_vector_length(s_gaps); i++) {
s_block = SCM_SIMPLE_VECTOR_REF(s_gaps, i);
SCM_ASSERT(scm_is_vector(s_block), s_block, SCM_ARGn, "make-nr-sack-chunk");
if (scm_c_vector_length(s_block) != 2) {
scm_out_of_range("make-nr-sack-chunk", s_block);
}
start = htons(scm_to_uint16(SCM_SIMPLE_VECTOR_REF(s_block, 0)));
end = htons(scm_to_uint16(SCM_SIMPLE_VECTOR_REF(s_block, 1)));
memcpy((void *)(nr_sack_chunk->tsns + offset), (const void *)&start, 2);
offset += 2;
memcpy((void *)(nr_sack_chunk->tsns + offset), (const void *)&end, 2);
offset += 2;
}
for (i = 0; i < scm_c_vector_length(s_nr_gaps); i++) {
s_block = SCM_SIMPLE_VECTOR_REF(s_nr_gaps, i);
SCM_ASSERT(scm_is_vector(s_block), s_block, SCM_ARGn, "make-nr-sack-chunk");
if (scm_c_vector_length(s_block) != 2) {
scm_out_of_range("make-nr-sack-chunk", s_block);
}
start = htons(scm_to_uint16(SCM_SIMPLE_VECTOR_REF(s_block, 0)));
end = htons(scm_to_uint16(SCM_SIMPLE_VECTOR_REF(s_block, 1)));
memcpy((void *)(nr_sack_chunk->tsns + offset), (const void *)&start, 2);
offset += 2;
memcpy((void *)(nr_sack_chunk->tsns + offset), (const void *)&end, 2);
offset += 2;
}
for (i = 0; i < scm_c_vector_length(s_dup_tsns); i++) {
dup = htonl(scm_to_uint32(SCM_SIMPLE_VECTOR_REF(s_dup_tsns, i)));
memcpy((void *)(nr_sack_chunk->tsns + offset), (const void *)&dup, 4);
offset += 4;
}
SCM_RETURN_NEWSMOB(chunk_tag, nr_sack_chunk);
}
static SCM
get_cumulative_tsn_ack(SCM chunk_smob)
{
struct shutdown_chunk *chunk;
scm_assert_smob_type(chunk_tag, chunk_smob);
chunk = (struct shutdown_chunk *)SCM_SMOB_DATA(chunk_smob);
if ((chunk->type != SACK_CHUNK_TYPE) &&
(chunk->type != NR_SACK_CHUNK_TYPE) &&
(chunk->type != SHUTDOWN_CHUNK_TYPE)) {
scm_syserror_msg ("get-cumulative-tsn-ack", "incorrect chunk type", chunk_smob, 0);
}
if (ntohs(chunk-> length) < SHUTDOWN_CHUNK_LENGTH) {
scm_syserror_msg ("get-cumulative-tsn-ack", "incorrect chunk length", chunk_smob, 0);
}
return scm_from_uint32(ntohl(chunk->cumulative_tsn_ack));
}
static SCM
get_nr_of_gaps(SCM chunk_smob)
{
struct chunk *chunk;
scm_assert_smob_type(chunk_tag, chunk_smob);
chunk = (struct chunk *)SCM_SMOB_DATA(chunk_smob);
if ((chunk->type != SACK_CHUNK_TYPE) &&
(chunk->type != NR_SACK_CHUNK_TYPE)) {
scm_syserror_msg ("get-number-of-gaps", "incorrect chunk type", chunk_smob, 0);
}
if (((chunk->type == SACK_CHUNK_TYPE) && (ntohs(chunk->length) < MIN_SACK_CHUNK_LENGTH)) ||
((chunk->type == NR_SACK_CHUNK_TYPE) && (ntohs(chunk->length) < MIN_NR_SACK_CHUNK_LENGTH))) {
scm_syserror_msg ("get-number-of-gaps", "incorrect chunk length", chunk_smob, 0);
}
if (chunk->type == SACK_CHUNK_TYPE) {
struct sack_chunk *sack_chunk;
sack_chunk = (struct sack_chunk *)SCM_SMOB_DATA(chunk_smob);
return scm_from_uint16(ntohs(sack_chunk->nr_of_gaps));
} else {
struct nr_sack_chunk *nr_sack_chunk;
nr_sack_chunk = (struct nr_sack_chunk *)SCM_SMOB_DATA(chunk_smob);
return scm_from_uint16(ntohs(nr_sack_chunk->nr_of_gaps));
}
}
static SCM
get_nr_of_nr_gaps(SCM chunk_smob)
{
struct chunk *chunk;
struct nr_sack_chunk *nr_sack_chunk;
scm_assert_smob_type(chunk_tag, chunk_smob);
chunk = (struct chunk *)SCM_SMOB_DATA(chunk_smob);
if (chunk->type != NR_SACK_CHUNK_TYPE) {
scm_syserror_msg ("get-number-of-nr-gaps", "incorrect chunk type", chunk_smob, 0);
}
if (ntohs(chunk->length) < MIN_NR_SACK_CHUNK_LENGTH) {
scm_syserror_msg ("get-number-of-nr-gaps", "incorrect chunk length", chunk_smob, 0);
}
nr_sack_chunk = (struct nr_sack_chunk *)SCM_SMOB_DATA(chunk_smob);
return scm_from_uint16(ntohs(nr_sack_chunk->nr_of_nr_gaps));
}
static SCM
get_nr_of_dups(SCM chunk_smob)
{
struct chunk *chunk;
scm_assert_smob_type(chunk_tag, chunk_smob);
chunk = (struct chunk *)SCM_SMOB_DATA(chunk_smob);
if ((chunk->type != SACK_CHUNK_TYPE) &&
(chunk->type != NR_SACK_CHUNK_TYPE)) {
scm_syserror_msg ("get-number-of-dups", "incorrect chunk type", chunk_smob, 0);
}
if (((chunk->type == SACK_CHUNK_TYPE) && (ntohs(chunk->length) < MIN_SACK_CHUNK_LENGTH)) ||
((chunk->type == NR_SACK_CHUNK_TYPE) && (ntohs(chunk->length) < MIN_NR_SACK_CHUNK_LENGTH))) {
scm_syserror_msg ("get-number-of-dups", "incorrect chunk length", chunk_smob, 0);
}
if (chunk->type == SACK_CHUNK_TYPE) {
struct sack_chunk *sack_chunk;
sack_chunk = (struct sack_chunk *)SCM_SMOB_DATA(chunk_smob);
return scm_from_uint16(ntohs(sack_chunk->nr_of_dups));
} else {
struct nr_sack_chunk *nr_sack_chunk;
nr_sack_chunk = (struct nr_sack_chunk *)SCM_SMOB_DATA(chunk_smob);
return scm_from_uint16(ntohs(nr_sack_chunk->nr_of_dups));
}
}
static SCM
get_gaps(SCM chunk_smob)