/**
* \brief Check if it is necessary to send acknowledgment packet?
*/
static int check_ack_nak_flag(struct vContext *C)
{
struct VDgramConn *vconn = CTX_current_dgram_conn(C);
struct VPacket *s_packet = CTX_s_packet(C);
struct VPacket *last_r_packet = CTX_r_packet(C);
int ret = 0;
/* Is it necessary to acknowledge payload packet? Several conditions
* has to be accomplished */
/* There has to be some ACK and NAK commands for sending */
if( vconn->ack_nak.count > 0 ) {
if(
/* Piggy packing of AckNak packet to the payload packet */
(s_packet->header.flags & PAY_FLAG)
||
/* Last received packet was payload packet (not only AckNak packet) ... */
(
(last_r_packet->header.flags & PAY_FLAG) &&
(last_r_packet->acked == 0)
)
)
{
last_r_packet->acked = 1;
ret = 1;
}
}
return ret;
}
void vc_REQUEST_init_send_packet(struct vContext *C)
{
struct VC_CTX *vc_ctx = CTX_client_ctx(C);
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct VSession *vsession = CTX_current_session(C);
struct VPacket *s_packet = CTX_s_packet(C);
int cmd_rank = 0;
static const uint8 cc_none = CC_NONE,
cmpr_none = CMPR_NONE,
cmpr_addr_share = CMPR_ADDR_SHARE;
/* Verse packet header */
s_packet->header.version = 1;
s_packet->header.flags = PAY_FLAG | SYN_FLAG;
s_packet->header.window = dgram_conn->rwin_host >> dgram_conn->rwin_host_scale;
s_packet->header.payload_id = dgram_conn->host_id;
s_packet->header.ack_nak_id = 0;
s_packet->header.ank_id = 0;
/* System commands */
if(vsession->host_token.str!=NULL) {
/* Add negotiated token */
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CHANGE_L_ID, FTR_TOKEN, vsession->host_token.str, NULL);
}
/* Add CC (local) proposal */
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CHANGE_L_ID, FTR_CC_ID, &cc_none, NULL);
/* Add CC (remote) proposal */
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CHANGE_R_ID, FTR_CC_ID, &cc_none, NULL);
/* Add Scale Window proposal */
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CHANGE_L_ID, FTR_RWIN_SCALE, &vc_ctx->rwin_scale, NULL);
/* Add command compression proposal */
if(vsession->flags & VRS_CMD_CMPR_NONE) {
/* Client doesn't want to send compressed commands (local proposal) */
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CHANGE_L_ID, FTR_CMD_COMPRESS, &cmpr_none, NULL);
/* Client isn't able to receive compressed commands (remote proposal) */
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CHANGE_R_ID, FTR_CMD_COMPRESS, &cmpr_none, NULL);
} else {
/* Client wants to send compressed commands (local proposal) */
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CHANGE_L_ID, FTR_CMD_COMPRESS, &cmpr_addr_share, NULL);
/* Client is able to receive compressed commands (remote proposal) */
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CHANGE_R_ID, FTR_CMD_COMPRESS, &cmpr_addr_share, NULL);
}
}
int vc_send_packet(struct vContext *C)
{
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct IO_CTX *io_ctx = CTX_io_ctx(C);
struct VPacket *s_packet = CTX_s_packet(C);
int error_num;
struct timeval tv;
unsigned short buffer_pos = 0;
int ret;
v_print_send_packet(C);
/* Fill buffer */
buffer_pos += v_pack_packet_header(s_packet, &io_ctx->buf[buffer_pos]);
buffer_pos += v_pack_dgram_system_commands(s_packet, &io_ctx->buf[buffer_pos]);
io_ctx->buf_size = buffer_pos;
/* Send buffer */
ret = v_send_packet(io_ctx, &error_num);
if(ret == SEND_PACKET_SUCCESS) {
/* Update time of sending last packet */
gettimeofday(&tv, NULL);
dgram_conn->tv_pay_send.tv_sec = tv.tv_sec;
dgram_conn->tv_pay_send.tv_usec = tv.tv_usec;
/* Update counter of sent packets */
switch(dgram_conn->host_state) {
case UDP_CLIENT_STATE_REQUEST:
dgram_conn->count_s_pay = 1;
dgram_conn->count_s_ack = 0;
break;
case UDP_CLIENT_STATE_PARTOPEN:
dgram_conn->count_s_pay = 2;
dgram_conn->count_s_ack = 1;
break;
case UDP_CLIENT_STATE_OPEN:
dgram_conn->count_s_pay++;
dgram_conn->count_s_ack++;
break;
case UDP_CLIENT_STATE_CLOSING:
break;
case UDP_CLIENT_STATE_CLOSED:
break;
}
}
return ret;
}
void vc_PARTOPEN_init_send_packet(struct vContext *C)
{
struct VSession *vsession = CTX_current_session(C);
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct VPacket *s_packet = CTX_s_packet(C);
struct VPacket *r_packet = CTX_r_packet(C);
int cmd_rank = 0;
/* Verse packet header */
s_packet->header.version = 1;
s_packet->header.flags = PAY_FLAG | ACK_FLAG ;
s_packet->header.window = dgram_conn->rwin_host >> dgram_conn->rwin_host_scale;
s_packet->header.payload_id = dgram_conn->host_id + 1;
s_packet->header.ack_nak_id = 0;
if(r_packet->sys_cmd[0].cmd.id == CMD_ACK_ID) {
s_packet->header.flags |= ANK_FLAG;
s_packet->header.ank_id = r_packet->sys_cmd[0].ack_cmd.pay_id;
dgram_conn->ank_id = r_packet->sys_cmd[0].ack_cmd.pay_id;
} else {
s_packet->header.ank_id = 0;
}
/* System commands */
s_packet->sys_cmd[cmd_rank].ack_cmd.id = CMD_ACK_ID;
s_packet->sys_cmd[cmd_rank].ack_cmd.pay_id = dgram_conn->peer_id;
cmd_rank++;
/* Confirm proposed TOKEN */
if(vsession->peer_token.str!=NULL) {
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CONFIRM_L_ID, FTR_TOKEN, vsession->peer_token.str, NULL);
}
/* Confirm proposed Flow Control ID */
if(dgram_conn->fc_meth != FC_RESERVED) {
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CONFIRM_L_ID, FTR_FC_ID, &dgram_conn->fc_meth, NULL);
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CONFIRM_R_ID, FTR_FC_ID, &dgram_conn->fc_meth, NULL);
}
/* Confirm proposed shifting of Flow Control Window */
if(dgram_conn->rwin_peer_scale != 0) {
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CONFIRM_L_ID, FTR_RWIN_SCALE, &dgram_conn->rwin_peer_scale, NULL);
}
}
void v_print_send_packet(struct vContext *C)
{
struct IO_CTX *io_ctx = CTX_io_ctx(C);
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct VPacket *s_packet = CTX_s_packet(C);
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 32);
v_print_log(VRS_PRINT_DEBUG_MSG, "Send packet: ");
v_print_log_simple(VRS_PRINT_DEBUG_MSG, "Socket: %d, ", io_ctx->sockfd);
v_print_addr_port(VRS_PRINT_DEBUG_MSG, &io_ctx->peer_addr);
v_print_packet_header(VRS_PRINT_DEBUG_MSG, s_packet);
v_print_log(VRS_PRINT_DEBUG_MSG, "Shift: %d -> Window: %d\n", dgram_conn->rwin_host_scale, (unsigned int)s_packet->header.window << dgram_conn->rwin_host_scale);
v_print_packet_sys_cmds(VRS_PRINT_DEBUG_MSG, s_packet);
printf("%c[%dm", 27, 0);
}
}
void vc_CLOSING_init_send_packet(struct vContext *C)
{
struct VDgramConn *dgram_conn = CTX_current_dgram_conn(C);
struct VPacket *s_packet = CTX_s_packet(C);
/* Verse packet header */
s_packet->header.version = 1;
s_packet->header.flags = PAY_FLAG | FIN_FLAG;
s_packet->header.window = dgram_conn->rwin_host >> dgram_conn->rwin_host_scale;
s_packet->header.payload_id = dgram_conn->host_id + dgram_conn->count_s_pay;
s_packet->header.ack_nak_id = dgram_conn->count_s_ack;
s_packet->header.ank_id = 0;
/* System commands */
/* TODO: send ack and nak commands */
s_packet->sys_cmd[0].cmd.id = CMD_RESERVED_ID;
}
/**
* \brief This function send packets in OPEN and CLOSEREQ state.
*/
int send_packet_in_OPEN_CLOSEREQ_state(struct vContext *C)
{
struct VDgramConn *vconn = CTX_current_dgram_conn(C);
struct IO_CTX *io_ctx = CTX_io_ctx(C);
struct VSession *vsession = CTX_current_session(C);
struct VPacket *s_packet = CTX_s_packet(C);
struct VSent_Packet *sent_packet = NULL;
unsigned short buffer_pos = 0;
struct timeval tv;
int ret, keep_alive_packet = -1, full_packet = 0;
int error_num;
uint16 swin, prio_win, sent_size = 0;
uint32 rwin;
int cmd_rank = 0;
/* Verse packet header */
s_packet->header.version = 1;
/* Clear header flags */
s_packet->header.flags = 0;
/* Check if it is necessary to send payload packet */
ret = check_pay_flag(C);
if(ret!=0) {
s_packet->header.flags |= PAY_FLAG;
if(ret==2) {
keep_alive_packet = 1;
}
}
/* When server is in CLOSEREQ state, then FIN flag should be set up */
if(vconn->host_state == UDP_SERVER_STATE_CLOSEREQ) {
s_packet->header.flags |= FIN_FLAG;
}
/* Check if it is necessary to send acknowledgment of received payload
* packet */
ret = check_ack_nak_flag(C);
if(ret==1) {
s_packet->header.flags |= ACK_FLAG;
/* Update last acknowledged Payload packet */
vconn->last_acked_pay = vconn->last_r_pay;
/* Add ACK and NAK commands from the list of ACK and NAK commands to the
* packet (only max count of ACK and NAK commands could be added to
* the packet) */
for(cmd_rank = 0;
cmd_rank < vconn->ack_nak.count &&
cmd_rank < MAX_SYSTEM_COMMAND_COUNT;
cmd_rank++)
{
s_packet->sys_cmd[cmd_rank].ack_cmd.id = vconn->ack_nak.cmds[cmd_rank].id;
s_packet->sys_cmd[cmd_rank].ack_cmd.pay_id = vconn->ack_nak.cmds[cmd_rank].pay_id;
}
s_packet->sys_cmd[cmd_rank].cmd.id = CMD_RESERVED_ID;
}
/* If there is no need to send Payload or AckNak packet, then cancel
* sending of packet */
if(! ((s_packet->header.flags & PAY_FLAG) ||
(s_packet->header.flags & ACK_FLAG)) ) return SEND_PACKET_CANCELED;
s_packet->header.flags |= ANK_FLAG;
s_packet->header.ank_id = vconn->ank_id;
/* Compute current windows for flow control and congestion control */
set_host_rwin(C);
set_host_cwin(C);
/* Set window of flow control that will sent to receiver */
rwin = vconn->rwin_host >> vconn->rwin_host_scale;
s_packet->header.window = (unsigned short)(rwin > 0xFFFF) ? 0xFFFF : rwin;
/*printf("\t---real window: %d---\n", s_packet->header.window);*/
/* Compute how many data could be sent to not congest receiver */
rwin = vconn->rwin_peer - vconn->sent_size;
/* Select smallest window for sending (congestion control window or flow control window)*/
swin = (vconn->cwin < rwin) ? vconn->cwin : rwin;
/* Set up Payload ID, when there is need to send payload packet */
if(s_packet->header.flags & PAY_FLAG)
s_packet->header.payload_id = vconn->host_id + vconn->count_s_pay;
else
s_packet->header.payload_id = 0;
/* Set up AckNak ID, when there are some ACK or NAK command in the packet */
if(s_packet->header.flags & ACK_FLAG)
s_packet->header.ack_nak_id = vconn->count_s_ack;
else
s_packet->header.ack_nak_id = 0;
/* When negotiated and used FPS is different, then pack negotiate command
* for FPS */
if(vsession->fps_host != vsession->fps_peer) {
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CHANGE_L_ID, FTR_FPS, &vsession->fps_host, NULL);
} else {
if(vsession->tmp_flags & SYS_CMD_NEGOTIATE_FPS) {
cmd_rank += v_add_negotiate_cmd(s_packet->sys_cmd, cmd_rank,
CMD_CONFIRM_L_ID, FTR_FPS, &vsession->fps_peer, NULL);
/* Send confirmation only once for received system command */
vsession->tmp_flags &= ~SYS_CMD_NEGOTIATE_FPS;
}
}
v_print_send_packet(C);
/* Fill buffer */
buffer_pos += v_pack_packet_header(s_packet, &io_ctx->buf[buffer_pos]);
buffer_pos += v_pack_dgram_system_commands(s_packet, &io_ctx->buf[buffer_pos]);
/* When this is not pure keep alive packet */
if(s_packet->header.flags & PAY_FLAG) {
sent_packet = v_packet_history_add_packet(&vconn->packet_history, s_packet->header.payload_id);
assert(sent_packet != NULL);
if(keep_alive_packet != 1) {
real32 prio_sum_high, prio_sum_low, r_prio;
uint32 prio_count;
int16 prio, max_prio, min_prio;
uint16 tot_cmd_size;
/* Print outgoing command with green color */
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 32);
}
max_prio = v_out_queue_get_max_prio(vsession->out_queue);
min_prio = v_out_queue_get_min_prio(vsession->out_queue);
prio_sum_high = v_out_queue_get_prio_sum_high(vsession->out_queue);
prio_sum_low = v_out_queue_get_prio_sum_low(vsession->out_queue);
v_print_log(VRS_PRINT_DEBUG_MSG, "Packing prio queues, cmd count: %d\n", v_out_queue_get_count(vsession->out_queue));
/* Go through all priorities and pick commands from priority queues */
for(prio = max_prio; prio >= min_prio; prio--)
{
/* TODO: Add better check here */
if(prio <= VRS_DEFAULT_PRIORITY && buffer_pos >= vconn->io_ctx.mtu) {
break;
}
prio_count = v_out_queue_get_count_prio(vsession->out_queue, prio);
if(prio_count > 0) {
r_prio = v_out_queue_get_prio(vsession->out_queue, prio);
/* Compute size of buffer that could be occupied by
* commands from this queue */
if(prio >= VRS_DEFAULT_PRIORITY) {
prio_win = ((swin - buffer_pos)*r_prio)/prio_sum_high;
} else {
prio_win = ((swin - buffer_pos)*r_prio)/prio_sum_low;
}
/* Debug print */
v_print_log(VRS_PRINT_DEBUG_MSG, "Queue: %d, count: %d, r_prio: %6.3f, prio_win: %d\n",
prio, prio_count, r_prio, prio_win);
/* Get total size of commands that were stored in queue (sent_size) */
tot_cmd_size = 0;
/* Pack commands from queues with high priority to the buffer */
buffer_pos = pack_prio_queue(C, sent_packet, buffer_pos, prio, prio_win, &tot_cmd_size);
sent_size += tot_cmd_size;
}
}
/* Use default color for output */
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%dm", 27, 0);
}
} else {
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 32);
v_print_log(VRS_PRINT_DEBUG_MSG, "Keep alive packet\n");
printf("%c[%dm", 27, 0);
}
}
}
/* Update sent_size */
vconn->sent_size += sent_size;
io_ctx->buf_size = buffer_pos;
/* Send buffer */
ret = v_send_packet(io_ctx, &error_num);
if(ret==SEND_PACKET_SUCCESS) {
gettimeofday(&tv, NULL);
/* Update time of sending last payload packet */
if(s_packet->header.flags & PAY_FLAG) {
vconn->tv_pay_send.tv_sec = tv.tv_sec;
vconn->tv_pay_send.tv_usec = tv.tv_usec;
/* Store time of sending packet in history of sent packets. It is
* used for computing RTT and SRTT */
if(sent_packet != NULL) {
sent_packet->tv.tv_sec = tv.tv_sec;
sent_packet->tv.tv_usec = tv.tv_usec;
}
}
/* Update time of sending last acknowledgment packet */
if(s_packet->header.flags & ACK_FLAG) {
vconn->tv_ack_send.tv_sec = tv.tv_sec;
vconn->tv_ack_send.tv_usec = tv.tv_usec;
}
/* Update counter of sent packets */
if(s_packet->header.flags & PAY_FLAG) vconn->count_s_pay++;
if(s_packet->header.flags & ACK_FLAG) vconn->count_s_ack++;
/* If the packet was sent full and there are some pending data to send
* then modify returned value*/
if(full_packet == 1) {
ret = SEND_PACKET_FULL;
}
} else {
/* When packet wasn't sent, then remove this packet from history */
if(sent_packet != NULL) {
v_packet_history_rem_packet(C, s_packet->header.payload_id);
}
}
/*v_print_packet_history(&vconn->packet_history);*/
return ret;
}