bool pdu_pci_present(const struct pdu * pdu)
{
if (!pdu_is_ok(pdu))
return false;
return pdu->pci ? true : false;
}
struct pci * pdu_pci_get_rw(struct pdu * pdu)
{
if (!pdu_is_ok(pdu))
return NULL;
return pdu->pci;
}
struct buffer * pdu_buffer_get_rw(struct pdu * pdu)
{
if (!pdu_is_ok(pdu))
return NULL;
return pdu->buffer;
}
int
common_closed_window(struct dtp_ps * ps, struct pdu * pdu)
{
struct dtp * dtp = ps->dm;
struct cwq * cwq;
struct dt * dt;
uint_t max_len;
if (!dtp) {
LOG_ERR("No instance passed, cannot run policy");
pdu_destroy(pdu);
return -1;
}
if (!pdu_is_ok(pdu)) {
LOG_ERR("PDU is not ok, cannot run policy");
pdu_destroy(pdu);
return -1;
}
dt = dtp_dt(dtp);
ASSERT(dt);
cwq = dt_cwq(dt);
if (!cwq) {
LOG_ERR("Failed to get cwq");
pdu_destroy(pdu);
return -1;
}
LOG_DBG("Closed Window Queue");
ASSERT(dtp);
max_len = dtcp_max_closed_winq_length(dtcp_config_get(dt_dtcp(dt)));
if (cwq_size(cwq) < max_len - 1) {
if (cwq_push(cwq, pdu)) {
LOG_ERR("Failed to push into cwq");
return -1;
}
return 0;
}
ASSERT(ps->flow_control_overrun);
if (ps->flow_control_overrun(ps, pdu)) {
LOG_ERR("Failed Flow Control Overrun");
return -1;
}
return 0;
}
static struct pdu * pdu_dup_gfp(gfp_t flags,
const struct pdu * pdu)
{
struct pdu * tmp;
if (!pdu_is_ok(pdu))
return NULL;
tmp = rkmalloc(sizeof(*tmp), flags);
if (!tmp)
return NULL;
tmp->pci = pci_dup_gfp(flags, pdu->pci);
tmp->buffer = buffer_dup_gfp(flags, pdu->buffer);
if (!pdu_is_ok(tmp)) {
pdu_destroy(tmp);
return NULL;
}
return tmp;
}
static int
default_flow_control_overrun(struct dtp_ps * ps,
struct pdu * pdu)
{
struct cwq * cwq;
struct dt * dt;
struct dtp * dtp = ps->dm;
if (!dtp) {
LOG_ERR("No instance passed, cannot run policy");
return -1;
}
dt = dtp_dt(dtp);
ASSERT(dt);
cwq = dt_cwq(dt);
if (!cwq) {
LOG_ERR("Failed to get cwq");
pdu_destroy(pdu);
return -1;
}
LOG_DBG("Default Flow Control");
if (!pdu_is_ok(pdu)) {
LOG_ERR("PDU is not ok, cannot run policy");
return -1;
}
if (cwq_push(cwq, pdu)) {
LOG_ERR("Failed to push into cwq");
return -1;
}
if (efcp_disable_write(dt_efcp(dt)))
return -1;
return 0;
}
static struct pdu * pdu_create_from_gfp(gfp_t flags,
const struct sdu * sdu)
{
struct pdu * tmp_pdu;
const struct buffer * tmp_buff;
const uint8_t * ptr;
size_t pci_size;
/* FIXME: This implementation is pure crap, please fix it soon */
if (!sdu_is_ok(sdu))
return NULL;
tmp_buff = sdu_buffer_ro(sdu);
ASSERT(tmp_buff);
if (buffer_length(tmp_buff) < pci_length_min())
return NULL;
/* FIXME: We should compute the real PCI length */
pci_size = pci_length_min();
tmp_pdu = pdu_create_gfp(flags);
if (!tmp_pdu)
return NULL;
ptr = (const uint8_t *) buffer_data_ro(tmp_buff);
ASSERT(ptr);
tmp_pdu->pci = pci_create_from_gfp(flags, ptr);
tmp_pdu->buffer = buffer_create_from_gfp(flags,
ptr + pci_size,
(buffer_length(sdu->buffer) -
pci_size));
ASSERT(pdu_is_ok(tmp_pdu));
return tmp_pdu;
}
static int
default_closed_window(struct dtp_ps * ps, struct pdu * pdu)
{
struct dtp * dtp = ps->dm;
struct cwq * cwq;
struct dt * dt;
struct dtp_sv * sv;
struct connection * connection;
uint_t max_len;
if (!dtp) {
LOG_ERR("No instance passed, cannot run policy");
pdu_destroy(pdu);
return -1;
}
if (!pdu_is_ok(pdu)) {
LOG_ERR("PDU is not ok, cannot run policy");
pdu_destroy(pdu);
return -1;
}
dt = dtp_dt(dtp);
ASSERT(dt);
cwq = dt_cwq(dt);
if (!cwq) {
LOG_ERR("Failed to get cwq");
pdu_destroy(pdu);
return -1;
}
LOG_DBG("Closed Window Queue");
ASSERT(dtp);
sv = dtp_dtp_sv(dtp);
ASSERT(sv);
connection = dtp_sv_connection(sv);
ASSERT(connection);
ASSERT(connection->policies_params);
max_len = dtcp_max_closed_winq_length(connection->
policies_params->
dtcp_cfg);
if (cwq_size(cwq) < max_len - 1) {
if (cwq_push(cwq, pdu)) {
LOG_ERR("Failed to push into cwq");
return -1;
}
return 0;
}
ASSERT(ps->flow_control_overrun);
if (ps->flow_control_overrun(ps, pdu)) {
LOG_ERR("Failed Flow Control Overrun");
return -1;
}
return 0;
}
static struct pdu * pdu_deserialize_gfp(gfp_t flags,
const struct serdes * instance,
struct pdu_ser * pdu)
{
struct pdu * new_pdu;
struct dt_cons * dt_cons;
const struct buffer * tmp_buff;
struct buffer * new_buff;
struct pci * new_pci;
const uint8_t * ptr;
int offset;
ssize_t pdu_len;
seq_num_t seq;
if (!pdu_ser_is_ok(pdu))
return NULL;
if (!instance)
return NULL;
dt_cons = instance->dt_cons;
ASSERT(dt_cons);
tmp_buff = pdu_ser_buffer(pdu);
ASSERT(tmp_buff);
if (buffer_length(tmp_buff) < base_pci_size(dt_cons))
return NULL;
ptr = (const uint8_t *) buffer_data_ro(tmp_buff);
ASSERT(ptr);
new_pdu = pdu_create_gfp(flags);
if (!new_pdu) {
LOG_ERR("Failed to create new pdu");
return NULL;
}
new_pci = pci_create_gfp(flags);
if (!new_pci) {
LOG_ERR("Failed to create new pci");
pdu_destroy(new_pdu);
return NULL;
}
pdu_len = 0;
if (deserialize_base_pci(instance, new_pci, &offset, ptr, &pdu_len)) {
LOG_ERR("Could not deser base PCI");
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
switch (pci_type(new_pci)) {
case PDU_TYPE_MGMT:
case PDU_TYPE_DT:
/* Create buffer with rest of PDU if it is a DT or MGMT PDU*/
memcpy(&seq,
ptr + offset,
dt_cons->seq_num_length);
offset += dt_cons->seq_num_length;
if (pci_sequence_number_set(new_pci, seq)) {
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
new_buff = buffer_create_from_gfp(flags,
ptr + offset,
pdu_len - offset);
if (!new_buff) {
LOG_ERR("Could not create new_buff");
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
break;
case PDU_TYPE_FC:
if (deserialize_ctrl_seq(instance, new_pci, &offset, ptr) ||
deserialize_fc_pci(instance, new_pci, &offset, ptr)) {
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
/*
* FIXME: It would be better if a PDU consisted of
* Base PCI + Data | Control PDU stuff
* e.g.
* struct pdu {
* struct pci base_pci;
* union {
* struct buffer * data;
* struct pci_ctrl * ctrl;
* }
* }
*/
new_buff = buffer_create_gfp(flags, 1);
if (!new_buff) {
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
break;
case PDU_TYPE_ACK:
if (deserialize_ctrl_seq(instance, new_pci, &offset, ptr) ||
deserialize_ack_pci(instance, new_pci, &offset, ptr)) {
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
new_buff = buffer_create_gfp(flags, 1);
if (!new_buff) {
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
break;
case PDU_TYPE_ACK_AND_FC:
if (deserialize_ctrl_seq(instance, new_pci, &offset, ptr) ||
deserialize_ack_pci(instance, new_pci, &offset, ptr) ||
deserialize_fc_pci(instance, new_pci, &offset, ptr)) {
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
new_buff = buffer_create_gfp(flags, 1);
if (!new_buff) {
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
break;
case PDU_TYPE_CC:
if (deserialize_ctrl_seq(instance, new_pci, &offset, ptr) ||
deserialize_cc_pci(instance, new_pci, &offset, ptr)) {
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
new_buff = buffer_create_gfp(flags, 1);
if (!new_buff) {
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
break;
default:
LOG_ERR("Unknown PDU type %02X", pci_type(new_pci));
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
if (pdu_pci_set(new_pdu, new_pci)) {
LOG_ERR("Failed to set PCI in PDU");
buffer_destroy(new_buff);
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
if (pdu_buffer_set(new_pdu, new_buff)) {
LOG_ERR("Failed to set buffer in PDU");
pdu_destroy(new_pdu);
return NULL;
}
ASSERT(pdu_is_ok(new_pdu));
pdu_ser_destroy(pdu);
return new_pdu;
}
static struct pdu_ser * pdu_serialize_gfp(gfp_t flags,
const const struct serdes * instance,
struct pdu * pdu)
{
struct pdu_ser * tmp;
struct dt_cons * dt_cons;
const void * buffer_data;
const struct buffer * buffer;
const struct pci * pci;
size_t size;
ssize_t buffer_size;
ssize_t pci_size;
char * data;
pdu_type_t pdu_type;
seq_num_t seq;
struct buffer * buf;
if (!pdu_is_ok(pdu))
return NULL;
if (!instance)
return NULL;
dt_cons = instance->dt_cons;
ASSERT(dt_cons);
buffer = pdu_buffer_get_ro(pdu);
if (!buffer)
return NULL;
buffer_data = buffer_data_ro(buffer);
if (!buffer_data)
return NULL;
buffer_size = buffer_length(buffer);
if (buffer_size <= 0)
return NULL;
pci = pdu_pci_get_ro(pdu);
if (!pci)
return NULL;
pdu_type = pci_type(pci);
if (!pdu_type_is_ok(pdu_type)) {
LOG_ERR("Wrong PDU type");
return NULL;
}
/* Base PCI size, fields present in all PDUs */
pci_size = base_pci_size(dt_cons);
/*
* These are available in the stack at this point in time
* Extend if necessary (e.g.) NACKs, SACKs, ...
* Set size in first switch/case
*/
switch (pdu_type) {
case PDU_TYPE_MGMT:
case PDU_TYPE_DT:
size = pci_size + dt_cons->seq_num_length + buffer_size;
if (size <= 0)
return NULL;
break;
case PDU_TYPE_FC:
size = pci_size + CTRL_SEQ_NR + fc_pci_size(dt_cons);
if (size <= 0)
return NULL;
break;
case PDU_TYPE_ACK:
size = pci_size + CTRL_SEQ_NR + dt_cons->seq_num_length;
if (size <= 0)
return NULL;
break;
case PDU_TYPE_ACK_AND_FC:
size = pci_size +
CTRL_SEQ_NR +
fc_pci_size(dt_cons) +
dt_cons->seq_num_length;
if (size <= 0)
return NULL;
break;
case PDU_TYPE_CC:
size = pci_size +
2 * CTRL_SEQ_NR +
4 * dt_cons->seq_num_length +
RATE_LEN;
if (size <= 0)
return NULL;
break;
default:
LOG_ERR("Unknown PDU type %02X", pdu_type);
return NULL;
}
data = rkmalloc(size, flags);
if (!data)
return NULL;
/* Needed for all PDUs */
if (serialize_base_pci(instance, data, pci, size)) {
LOG_ERR("Failed to serialize base PCI");
rkfree(data);
return NULL;
}
/* Do actual serializing in the second switch case */
switch (pdu_type) {
case PDU_TYPE_MGMT:
case PDU_TYPE_DT:
seq = pci_sequence_number_get(pci);
memcpy(data + pci_size, &seq, dt_cons->seq_num_length);
memcpy(data + pci_size + dt_cons->seq_num_length,
buffer_data, buffer_size);
break;
case PDU_TYPE_FC:
if (serialize_ctrl_seq(instance, data, pci, pci_size) ||
serialize_fc_pci(instance, data, pci,
pci_size + CTRL_SEQ_NR)) {
rkfree(data);
return NULL;
}
break;
case PDU_TYPE_ACK:
if (serialize_ctrl_seq(instance, data, pci, pci_size) ||
serialize_ack_pci(instance, data, pci,
pci_size + CTRL_SEQ_NR)) {
rkfree(data);
return NULL;
}
break;
case PDU_TYPE_ACK_AND_FC:
if (serialize_ctrl_seq(instance, data, pci, pci_size) ||
serialize_ack_pci(instance, data, pci,
pci_size + CTRL_SEQ_NR) ||
serialize_fc_pci(instance, data, pci,
pci_size +
CTRL_SEQ_NR +
dt_cons->seq_num_length)) {
rkfree(data);
return NULL;
}
break;
case PDU_TYPE_CC:
if (serialize_ctrl_seq(instance, data, pci, pci_size) ||
serialize_cc_pci(instance, data, pci,
pci_size + CTRL_SEQ_NR)) {
rkfree(data);
return NULL;
}
break;
default:
LOG_ERR("Unknown PDU type %02X", pdu_type);
return NULL;
}
buf = buffer_create_with_gfp(flags, data, size);
if (!buf) {
rkfree(data);
return NULL;
}
tmp = pdu_ser_create_buffer_with_gfp(flags, buf);
if (!tmp) {
rkfree(buf);
return NULL;
}
pdu_destroy(pdu);
return tmp;
}
int dtcp_common_rcv_control(struct dtcp * dtcp, struct pdu * pdu)
{
struct dtcp_ps * ps;
struct pci * pci;
pdu_type_t type;
seq_num_t sn;
seq_num_t last_ctrl;
int ret;
LOG_DBG("dtcp_common_rcv_control called");
if (!pdu_is_ok(pdu)) {
LOG_ERR("PDU is not ok");
pdu_destroy(pdu);
return -1;
}
if (!dtcp) {
LOG_ERR("DTCP instance bogus");
pdu_destroy(pdu);
return -1;
}
atomic_inc(&dtcp->cpdus_in_transit);
pci = pdu_pci_get_rw(pdu);
if (!pci_is_ok(pci)) {
LOG_ERR("PCI couldn't be retrieved");
atomic_dec(&dtcp->cpdus_in_transit);
pdu_destroy(pdu);
return -1;
}
type = pci_type(pci);
if (!pdu_type_is_control(type)) {
LOG_ERR("CommonRCVControl policy received a non-control PDU");
atomic_dec(&dtcp->cpdus_in_transit);
pdu_destroy(pdu);
return -1;
}
sn = pci_sequence_number_get(pci);
last_ctrl = last_rcv_ctrl_seq(dtcp);
if (sn <= last_ctrl) {
switch (type) {
case PDU_TYPE_FC:
flow_ctrl_inc(dtcp);
break;
case PDU_TYPE_ACK:
acks_inc(dtcp);
break;
case PDU_TYPE_ACK_AND_FC:
acks_inc(dtcp);
flow_ctrl_inc(dtcp);
break;
default:
break;
}
pdu_destroy(pdu);
return 0;
}
rcu_read_lock();
ps = container_of(rcu_dereference(dtcp->base.ps),
struct dtcp_ps, base);
if (sn > (last_ctrl + 1)) {
ps->lost_control_pdu(ps);
}
rcu_read_unlock();
/* We are in sn >= last_ctrl + 1 */
last_rcv_ctrl_seq_set(dtcp, sn);
LOG_DBG("dtcp_common_rcv_control sending to proper function...");
switch (type) {
case PDU_TYPE_ACK:
ret = rcv_ack(dtcp, pdu);
break;
case PDU_TYPE_NACK:
ret = rcv_nack_ctl(dtcp, pdu);
break;
case PDU_TYPE_FC:
ret = rcv_flow_ctl(dtcp, pdu);
break;
case PDU_TYPE_ACK_AND_FC:
ret = rcv_ack_and_flow_ctl(dtcp, pdu);
break;
default:
ret = -1;
break;
}
atomic_dec(&dtcp->cpdus_in_transit);
return ret;
}
static struct pdu * pdu_deserialize_gfp(gfp_t flags,
const struct serdes * instance,
struct pdu_ser * pdu,
struct dup_config_entry * dup_conf,
struct crypto_blkcipher * blkcipher)
{
struct pdu * new_pdu;
struct dt_cons * dt_cons;
struct buffer * tmp_buff;
struct buffer * new_buff;
struct pci * new_pci;
const uint8_t * ptr;
int offset;
ssize_t pdu_len;
seq_num_t seq;
ssize_t ttl;
uint8_t pad_len;
const char * data;
if (!instance)
return NULL;
if (!pdu_ser_is_ok(pdu))
return NULL;
/* FIXME: this should be moved to specific policy code */
if (dup_conf != NULL && dup_conf->error_check_policy != NULL){
if (!dup_chksum_is_ok(pdu)) {
LOG_ERR("Bad CRC, PDU has been corrupted");
return NULL;
}
/* Assuming CRC32 */
if (pdu_ser_head_shrink_gfp(flags, pdu, sizeof(u32))) {
LOG_ERR("Failed to shrink ser PDU");
return NULL;
}
}
/* FIXME: this should be moved to specific policy code */
if (blkcipher != NULL && dup_conf != NULL &&
dup_conf->enable_decryption){
if (!dup_decrypt_data(pdu, blkcipher)) {
LOG_ERR("Failed to decrypt PDU");
return NULL;
}
tmp_buff = pdu_ser_buffer(pdu);
data = buffer_data_ro(tmp_buff);
pad_len = data[buffer_length(tmp_buff)-1];
//remove padding
if (pdu_ser_tail_shrink_gfp(pdu, pad_len)){
LOG_ERR("Failed to shrink ser PDU");
return NULL;
}
}
dt_cons = instance->dt_cons;
ASSERT(dt_cons);
tmp_buff = pdu_ser_buffer(pdu);
ASSERT(tmp_buff);
if (buffer_length(tmp_buff) < base_pci_size(dt_cons))
return NULL;
new_pdu = pdu_create_gfp(flags);
if (!new_pdu) {
LOG_ERR("Failed to create new pdu");
return NULL;
}
new_pci = pci_create_gfp(flags);
if (!new_pci) {
LOG_ERR("Failed to create new pci");
pdu_destroy(new_pdu);
return NULL;
}
ttl = 0;
/* FIXME: this should be moved to specific policy code */
if (dup_conf != NULL && dup_conf->ttl_policy != NULL){
ttl = dup_ttl_decrement(pdu);
if (ttl < 0) {
LOG_ERR("Could not decrement TTL");
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
if (pci_ttl_set(new_pci, ttl)) {
LOG_ERR("Could not set TTL");
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
if (pdu_ser_head_shrink_gfp(flags, pdu, sizeof(u8))) {
LOG_ERR("Failed to shrink ser PDU");
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
}
ptr = (const uint8_t *) buffer_data_ro(tmp_buff);
ASSERT(ptr);
pdu_len = 0;
if (deserialize_base_pci(instance, new_pci, &offset, ptr, &pdu_len)) {
LOG_ERR("Could not deser base PCI");
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
switch (pci_type(new_pci)) {
case PDU_TYPE_MGMT:
case PDU_TYPE_DT:
/* Create buffer with rest of PDU if it is a DT or MGMT PDU*/
memcpy(&seq,
ptr + offset,
dt_cons->seq_num_length);
offset += dt_cons->seq_num_length;
if (pci_sequence_number_set(new_pci, seq)) {
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
new_buff = buffer_create_from_gfp(flags,
ptr + offset,
pdu_len - offset);
if (!new_buff) {
LOG_ERR("Could not create new_buff");
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
break;
case PDU_TYPE_FC:
if (deserialize_ctrl_seq(instance, new_pci, &offset, ptr) ||
deserialize_fc_pci(instance, new_pci, &offset, ptr)) {
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
/*
* FIXME: It would be better if a PDU consisted of
* Base PCI + Data | Control PDU stuff
* e.g.
* struct pdu {
* struct pci base_pci;
* union {
* struct buffer * data;
* struct pci_ctrl * ctrl;
* }
* }
*/
new_buff = buffer_create_gfp(flags, 1);
if (!new_buff) {
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
break;
case PDU_TYPE_ACK:
if (deserialize_ctrl_seq(instance, new_pci, &offset, ptr) ||
deserialize_ack_pci(instance, new_pci, &offset, ptr)) {
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
new_buff = buffer_create_gfp(flags, 1);
if (!new_buff) {
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
break;
case PDU_TYPE_ACK_AND_FC:
if (deserialize_ctrl_seq(instance, new_pci, &offset, ptr) ||
deserialize_ack_pci(instance, new_pci, &offset, ptr) ||
deserialize_fc_pci(instance, new_pci, &offset, ptr)) {
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
new_buff = buffer_create_gfp(flags, 1);
if (!new_buff) {
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
break;
case PDU_TYPE_CACK:
if (deserialize_ctrl_seq(instance, new_pci, &offset, ptr) ||
deserialize_cc_pci(instance, new_pci, &offset, ptr)) {
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
new_buff = buffer_create_gfp(flags, 1);
if (!new_buff) {
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
break;
default:
LOG_ERR("Unknown PDU type %02X", pci_type(new_pci));
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
if (pdu_pci_set(new_pdu, new_pci)) {
LOG_ERR("Failed to set PCI in PDU");
buffer_destroy(new_buff);
pci_destroy(new_pci);
pdu_destroy(new_pdu);
return NULL;
}
if (pdu_buffer_set(new_pdu, new_buff)) {
LOG_ERR("Failed to set buffer in PDU");
pdu_destroy(new_pdu);
return NULL;
}
ASSERT(pdu_is_ok(new_pdu));
pdu_ser_destroy(pdu);
return new_pdu;
}
static struct pdu_ser * pdu_serialize_gfp(gfp_t flags,
const const struct serdes * instance,
struct pdu * pdu,
struct dup_config_entry * dup_conf,
struct crypto_blkcipher * blkcipher)
{
struct pdu_ser * tmp;
struct dt_cons * dt_cons;
const void * buffer_data;
const struct buffer * buffer;
const struct pci * pci;
size_t size;
ssize_t buffer_size;
ssize_t blk_size;
ssize_t encrypted_size;
ssize_t pci_size;
char * data;
pdu_type_t pdu_type;
seq_num_t seq;
struct buffer * buf;
int i;
if (!pdu_is_ok(pdu))
return NULL;
if (!instance)
return NULL;
dt_cons = instance->dt_cons;
ASSERT(dt_cons);
buffer = pdu_buffer_get_ro(pdu);
if (!buffer)
return NULL;
buffer_data = buffer_data_ro(buffer);
if (!buffer_data)
return NULL;
buffer_size = buffer_length(buffer);
if (buffer_size <= 0)
return NULL;
pci = pdu_pci_get_ro(pdu);
if (!pci)
return NULL;
pdu_type = pci_type(pci);
if (!pdu_type_is_ok(pdu_type)) {
LOG_ERR("Wrong PDU type");
return NULL;
}
/* Base PCI size, fields present in all PDUs */
pci_size = base_pci_size(dt_cons);
/*
* These are available in the stack at this point in time
* Extend if necessary (e.g.) NACKs, SACKs, ...
* Set size in first switch/case
*/
switch (pdu_type) {
case PDU_TYPE_MGMT:
case PDU_TYPE_DT:
size = pci_size + dt_cons->seq_num_length + buffer_size;
if (size <= 0)
return NULL;
break;
case PDU_TYPE_FC:
size = pci_size + CTRL_SEQ_NR + fc_pci_size(dt_cons);
if (size <= 0)
return NULL;
break;
case PDU_TYPE_ACK:
size = pci_size + CTRL_SEQ_NR + dt_cons->seq_num_length;
if (size <= 0)
return NULL;
break;
case PDU_TYPE_ACK_AND_FC:
size = pci_size +
CTRL_SEQ_NR +
fc_pci_size(dt_cons) +
dt_cons->seq_num_length;
if (size <= 0)
return NULL;
break;
case PDU_TYPE_CACK:
size = pci_size +
2 * CTRL_SEQ_NR +
4 * dt_cons->seq_num_length +
RATE_LEN;
if (size <= 0)
return NULL;
break;
default:
LOG_ERR("Unknown PDU type %02X", pdu_type);
return NULL;
}
data = rkmalloc(size, flags);
if (!data)
return NULL;
/* Needed for all PDUs */
if (serialize_base_pci(instance, data, pci, size)) {
LOG_ERR("Failed to serialize base PCI");
rkfree(data);
return NULL;
}
/* Do actual serializing in the second switch case */
switch (pdu_type) {
case PDU_TYPE_MGMT:
case PDU_TYPE_DT:
seq = pci_sequence_number_get(pci);
memcpy(data + pci_size, &seq, dt_cons->seq_num_length);
memcpy(data + pci_size + dt_cons->seq_num_length,
buffer_data, buffer_size);
break;
case PDU_TYPE_FC:
if (serialize_ctrl_seq(instance, data, pci, pci_size) ||
serialize_fc_pci(instance, data, pci,
pci_size + CTRL_SEQ_NR)) {
rkfree(data);
return NULL;
}
break;
case PDU_TYPE_ACK:
if (serialize_ctrl_seq(instance, data, pci, pci_size) ||
serialize_ack_pci(instance, data, pci,
pci_size + CTRL_SEQ_NR)) {
rkfree(data);
return NULL;
}
break;
case PDU_TYPE_ACK_AND_FC:
if (serialize_ctrl_seq(instance, data, pci, pci_size) ||
serialize_ack_pci(instance, data, pci,
pci_size + CTRL_SEQ_NR) ||
serialize_fc_pci(instance, data, pci,
pci_size +
CTRL_SEQ_NR +
dt_cons->seq_num_length)) {
rkfree(data);
return NULL;
}
break;
case PDU_TYPE_CACK:
if (serialize_ctrl_seq(instance, data, pci, pci_size) ||
serialize_cc_pci(instance, data, pci,
pci_size + CTRL_SEQ_NR)) {
rkfree(data);
return NULL;
}
break;
default:
LOG_ERR("Unknown PDU type %02X", pdu_type);
return NULL;
}
buf = buffer_create_with_gfp(flags, data, size);
if (!buf) {
rkfree(data);
return NULL;
}
tmp = pdu_ser_create_buffer_with_gfp(flags, buf);
if (!tmp) {
rkfree(buf);
return NULL;
}
/* FIXME: this should be moved to specific policy code */
if (dup_conf != NULL && dup_conf->ttl_policy != NULL){
if (pdu_ser_head_grow_gfp(flags, tmp, sizeof(u8))) {
LOG_ERR("Failed to grow ser PDU");
pdu_ser_destroy(tmp);
return NULL;
}
if (!dup_ttl_set(tmp, pci_ttl(pci))) {
LOG_ERR("Could not set TTL");
pdu_ser_destroy(tmp);
return NULL;
}
if (dup_ttl_is_expired(tmp)) {
LOG_DBG("TTL is expired, dropping PDU");
pdu_ser_destroy(tmp);
return NULL;
}
}
/* FIXME: this should be moved to specific policy code */
if (blkcipher != NULL && dup_conf != NULL
&& dup_conf->enable_encryption){
buf = pdu_ser_buffer(tmp);
blk_size = crypto_blkcipher_blocksize(blkcipher);
buffer_size = buffer_length(buf);
encrypted_size = (buffer_size/blk_size + 1) * blk_size;
if (pdu_ser_tail_grow_gfp(tmp, encrypted_size - buffer_size)){
LOG_ERR("Failed to grow ser PDU");
pdu_ser_destroy(tmp);
return NULL;
}
/* PADDING */
data = buffer_data_rw(buf);
for (i=encrypted_size-1; i>buffer_size; i--){
data[i] = encrypted_size - buffer_size;
}
/* Encrypt */
if (!dup_encrypt_data(tmp, blkcipher)) {
LOG_ERR("Failed to encrypt PDU");
pdu_ser_destroy(tmp);
return NULL;
}
}
/* FIXME: this should be moved to specific policy code */
if (dup_conf != NULL && dup_conf->error_check_policy != NULL){
/* Assuming CRC32 */
if (pdu_ser_head_grow_gfp(flags, tmp, sizeof(u32))) {
LOG_ERR("Failed to grow ser PDU");
pdu_ser_destroy(tmp);
return NULL;
}
if (!dup_chksum_set(tmp)) {
LOG_ERR("Failed to add CRC");
pdu_ser_destroy(tmp);
return NULL;
}
ASSERT(dup_chksum_is_ok(tmp));
}
return tmp;
}
