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utun2/!/etcp.c1

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// etcp.c - ETCP Protocol Implementation (refactored and expanded based on etcp_protocol.txt)
#include "etcp.h"
#include "etcp_loadbalancer.h"
#include "../lib/u_async.h"
#include "../lib/debug_config.h"
#include "crc32.h"
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <math.h> // For bandwidth calcs
// Enable comprehensive debug output for ETCP module
#define DEBUG_CATEGORY_ETCP_DETAILED 1
// Constants from spec (adjusted for completeness)
#define MAX_INFLIGHT_BYTES 65536 // Initial window
#define RETRANS_K1 2.0f // RTT multiplier for retrans timeout
#define RETRANS_K2 1.5f // Jitter multiplier
#define ACK_DELAY_TB 20 // ACK timer delay (2ms in 0.1ms units)
#define BURST_DELAY_FACTOR 4 // Delay before burst
#define BURST_SIZE 5 // Packets in burst (1 delayed + 4 burst)
#define RTT_HISTORY_SIZE 10 // For jitter calc
#define MAX_PENDING 32 // For ACKs/retrans
#define SECTION_HEADER_SIZE 3 // type(1) + len(2)
// Forward declaration for callback function
static void input_queue_cb(struct ll_queue* q, struct ll_entry* entry, void* arg);
// Timestamp diff (with wrap-around)
static uint16_t timestamp_diff(uint16_t t1, uint16_t t2) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "timestamp_diff: t1=%u, t2=%u", t1, t2);
if (t1 >= t2) {
uint16_t diff = t1 - t2;
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "timestamp_diff: normal case, diff=%u", diff);
return diff;
}
uint16_t diff = (0xFFFF - t2) + t1 + 1;
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "timestamp_diff: wraparound case, diff=%u", diff);
return diff;
}
// Get current time in 0.1ms units
uint64_t get_current_time_units() {
struct timeval tv;
gettimeofday(&tv, NULL);
uint64_t time_units = ((uint64_t)tv.tv_sec * 10000ULL) + (tv.tv_usec / 100);
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "get_current_time_units: tv_sec=%ld, tv_usec=%ld, result=%llu",
tv.tv_sec, tv.tv_usec, (unsigned long long)time_units);
return time_units;
}
uint16_t get_current_timestamp() {
uint16_t timestamp = (uint16_t)(get_current_time_units() & 0xFFFF);
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "get_current_timestamp: result=%u", timestamp);
return timestamp;
}
// Internal functions (expanded)
static void retrans_timer_cb(void* arg);
static void ack_timer_cb(void* arg);
static void update_rtt(struct ETCP_CONN* etcp, uint16_t new_rtt);
static void calculate_jitter(struct ETCP_CONN* etcp);
static void detect_gaps_and_request_retrans(struct ETCP_CONN* etcp);
static void process_section_ack(struct ETCP_CONN* etcp, uint8_t* data, uint16_t len);
static void process_section_retrans(struct ETCP_CONN* etcp, uint8_t* data, uint16_t len);
static void process_section_timestamp(struct ETCP_CONN* etcp, uint8_t* data, uint16_t len);
static void process_section_payload(struct ETCP_CONN* etcp, uint8_t* data, uint16_t len);
static void process_section_meas_ts(struct ETCP_CONN* etcp, uint8_t* data, uint16_t len);
static void process_section_meas_resp(struct ETCP_CONN* etcp, uint8_t* data, uint16_t len);
static uint16_t append_optional_sections(struct ETCP_CONN* etcp, uint8_t* buf, struct ETCP_LINK* link);
static void deliver_contiguous_packets(struct ETCP_CONN* etcp);
static void retrans_check(struct ETCP_CONN* etcp);
static inflight_packet_t* find_inflight(struct ETCP_CONN* etcp, uint16_t id, uint8_t state);
static void move_to_wait_send(struct ETCP_CONN* etcp, inflight_packet_t* pkt);
static void remove_inflight(struct ETCP_CONN* etcp, inflight_packet_t* pkt);
static void free_inflight_packet(inflight_packet_t* pkt);
static void start_burst_measurement(struct ETCP_CONN* etcp, struct ETCP_LINK* link);
static void update_link_bandwidth(struct ETCP_LINK* link, uint32_t new_bw);
// Add RTT history to struct (for jitter)
/// In etcp.h, add to ETCP_CONN:
/// uint16_t rtt_history[RTT_HISTORY_SIZE];
/// uint8_t rtt_history_idx;
//=======================================================================================================================================================================
// Create ETCP connection (unchanged)
struct ETCP_CONN* etcp_connection_create(struct UTUN_INSTANCE* instance) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_connection_create: instance=%p", instance);
struct ETCP_CONN* etcp = calloc(1, sizeof(struct ETCP_CONN));
if (!etcp) {
DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "etcp_connection_create: failed to allocate ETCP_CONN");
return NULL;
}
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_connection_create: allocated etcp=%p", etcp);
etcp->instance = instance;
etcp->input_queue = queue_new(instance->ua, instance->pkt_pool);
etcp->output_queue = queue_new(instance->ua, instance->pkt_pool);
etcp->mtu = 1500; // Default
etcp->window_size = MAX_INFLIGHT_BYTES;
etcp->next_tx_id = 1;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_connection_create: queues created, mtu=%d, window_size=%u, next_tx_id=%u",
etcp->mtu, etcp->window_size, etcp->next_tx_id);
// Init crypto (as per original)
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_connection_create: initializing crypto context");
if (sc_init_ctx(&etcp->crypto_ctx, &instance->my_keys) != SC_OK) {
DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "etcp_connection_create: crypto initialization failed");
etcp_connection_close(etcp);
return NULL;
}
// Add connection to instance list
etcp->next = instance->connections;
instance->connections = etcp;
instance->connections_count++;
DEBUG_INFO(DEBUG_CATEGORY_ETCP, "etcp_connection_create: successfully created ETCP connection %p", etcp);
return etcp;
}
//=======================================================================================================================================================================
// Close connection (expanded free)
void etcp_connection_close(struct ETCP_CONN* etcp) {
if (!etcp) {
DEBUG_WARN(DEBUG_CATEGORY_ETCP, "etcp_connection_close: called with NULL etcp");
return;
}
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_connection_close: closing connection %p", etcp);
// Remove connection from instance list
if (etcp->instance) {
struct ETCP_CONN** prev = &etcp->instance->connections;
struct ETCP_CONN* cur = *prev;
while (cur) {
if (cur == etcp) {
*prev = cur->next;
etcp->instance->connections_count--;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_connection_close: removed from instance list, count=%d",
etcp->instance->connections_count);
break;
}
prev = &cur->next;
cur = cur->next;
}
}
// Cancel timers
if (etcp->retrans_timer) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_connection_close: canceling retrans_timer");
uasync_cancel_timeout(etcp->instance->ua, etcp->retrans_timer);
}
if (etcp->ack_timer) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_connection_close: canceling ack_timer");
uasync_cancel_timeout(etcp->instance->ua, etcp->ack_timer);
}
// Free inflight
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_connection_close: freeing wait_ack_list");
inflight_packet_t* pkt = etcp->wait_ack_list;
int wait_ack_count = 0;
while (pkt) {
inflight_packet_t* next = pkt->next;
free_inflight_packet(pkt);
pkt = next;
wait_ack_count++;
}
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_connection_close: freed %d packets from wait_ack_list", wait_ack_count);
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_connection_close: freeing wait_send_list");
pkt = etcp->wait_send_list;
int wait_send_count = 0;
while (pkt) {
inflight_packet_t* next = pkt->next;
free_inflight_packet(pkt);
pkt = next;
wait_send_count++;
}
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_connection_close: freed %d packets from wait_send_list", wait_send_count);
// Free rx_list
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_connection_close: freeing rx_list");
rx_packet_t* rx = etcp->rx_list;
int rx_count = 0;
while (rx) {
rx_packet_t* next = rx->next;
free(rx->data);
free(rx);
rx = next;
rx_count++;
}
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_connection_close: freed %d packets from rx_list", rx_count);
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_connection_close: freeing queues");
queue_free(etcp->input_queue);
queue_free(etcp->output_queue);
DEBUG_INFO(DEBUG_CATEGORY_ETCP, "etcp_connection_close: connection %p closed successfully", etcp);
free(etcp);
}
//=======================================================================================================================================================================
static void free_inflight_packet(inflight_packet_t* pkt) {
if (pkt) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "free_inflight_packet: freeing packet %p (id=%u, data_len=%u)",
pkt, pkt->id, pkt->data_len);
free(pkt->data);
free(pkt);
}
}
//=======================================================================================================================================================================
// Reset connection (unchanged)
void etcp_conn_reset(struct ETCP_CONN* etcp) {
if (!etcp) {
DEBUG_WARN(DEBUG_CATEGORY_ETCP, "etcp_conn_reset: called with NULL etcp");
return;
}
DEBUG_INFO(DEBUG_CATEGORY_ETCP, "etcp_conn_reset: resetting connection %p", etcp);
// Cancel timers
if (etcp->retrans_timer) uasync_cancel_timeout(etcp->instance->ua, etcp->retrans_timer);
if (etcp->ack_timer) uasync_cancel_timeout(etcp->instance->ua, etcp->ack_timer);
// Free lists
inflight_packet_t* pkt = etcp->wait_ack_list;
while (pkt) {
inflight_packet_t* next = pkt->next;
free_inflight_packet(pkt);
pkt = next;
}
etcp->wait_ack_list = NULL;
pkt = etcp->wait_send_list;
while (pkt) {
inflight_packet_t* next = pkt->next;
free_inflight_packet(pkt);
pkt = next;
}
etcp->wait_send_list = NULL;
rx_packet_t* rx = etcp->rx_list;
while (rx) {
rx_packet_t* next = rx->next;
free(rx->data);
free(rx);
rx = next;
}
etcp->rx_list = NULL;
// Reset state
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_conn_reset: clearing packet lists and resetting state");
etcp->next_tx_id = 1;
etcp->last_rx_id = 0;
etcp->last_delivered_id = 0;
etcp->unacked_bytes = 0;
etcp->pending_ack_count = 0;
etcp->pending_retrans_count = 0;
etcp->rtt_last = 0;
etcp->rtt_avg_10 = 0;
etcp->rtt_avg_100 = 0;
etcp->jitter = 0;
etcp->burst_in_progress = 0;
etcp->rtt_history_idx = 0;
memset(etcp->rtt_history, 0, sizeof(etcp->rtt_history));
// Queues cleared externally if needed
DEBUG_INFO(DEBUG_CATEGORY_ETCP, "etcp_conn_reset: connection %p reset completed", etcp);
}
//=======================================================================================================================================================================
// PACKET INPUT processing
//=======================================================================================================================================================================
// Input decrypted packet (unchanged structure, but calls expanded processes)
void etcp_conn_input(struct ETCP_DGRAM* pkt) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_conn_input: pkt=%p, link=%p, etcp=%p",
pkt, pkt ? pkt->link : NULL, pkt && pkt->link ? pkt->link->etcp : NULL);
if (!pkt || !pkt->link || !pkt->link->etcp) {
DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "etcp_conn_input: invalid parameters (pkt=%p, link=%p, etcp=%p)",
pkt, pkt ? pkt->link : NULL, pkt && pkt->link ? pkt->link->etcp : NULL);
return;
}
struct ETCP_CONN* etcp = pkt->link->etcp;
uint8_t* data = pkt->data;
uint16_t len = pkt->data_len;
uint16_t ts = pkt->timestamp;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_conn_input: processing packet - etcp=%p, data_len=%u, timestamp=%u, link=%p",
etcp, len, ts, pkt->link);
// Update link activity
pkt->link->last_activity = get_current_time_units();
pkt->link->last_recv_local_time = pkt->link->last_activity;
pkt->link->last_recv_timestamp = ts;
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "etcp_conn_input: updated link activity - last_activity=%llu, last_recv_timestamp=%u",
(unsigned long long)pkt->link->last_activity, pkt->link->last_recv_timestamp);
// Parse sections
uint16_t pos = 0;
while (pos < len) {
if (pos + SECTION_HEADER_SIZE > len) break;
uint8_t type = data[pos];
uint16_t sec_len = (data[pos+1] << 8) | data[pos+2];
pos += SECTION_HEADER_SIZE;
if (pos + sec_len > len) break;
uint8_t* sec_data = data + pos;
switch (type) {
case ETCP_SECTION_ACK:
process_section_ack(etcp, sec_data, sec_len);
break;
case ETCP_SECTION_RETRANS:
process_section_retrans(etcp, sec_data, sec_len);
break;
case ETCP_SECTION_TIMESTAMP:
process_section_timestamp(etcp, sec_data, sec_len);
break;
case ETCP_SECTION_PAYLOAD:
process_section_payload(etcp, sec_data, sec_len);
break;
case ETCP_SECTION_MEAS_TS:
process_section_meas_ts(etcp, sec_data, sec_len);
break;
case ETCP_SECTION_MEAS_RESP:
process_section_meas_resp(etcp, sec_data, sec_len);
break;
default:
DEBUG_WARN(DEBUG_CATEGORY_ETCP, "Unknown section type: 0x%02x", type);
break;
}
pos += sec_len;
}
// Post-processing
detect_gaps_and_request_retrans(etcp);
deliver_contiguous_packets(etcp);
// Trigger if waiting
if (etcp->wait_timeout_active) {
etcp->wait_timeout_active = 0;
// Assume load balancer polls again
}
}
// Request next packet (expanded)
// source 1: wait_ack_list
// source 2: queue > wait_ack_list
struct ETCP_DGRAM* etcp_request_pkt(struct ETCP_CONN* etcp) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: etcp=%p", etcp);
if (!etcp) {
DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: called with NULL etcp");
return NULL;
}
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: input_queue_count=%d, wait_send_list=%p, unacked_bytes=%u, window_size=%u",
queue_entry_count(etcp->input_queue), etcp->wait_send_list,
etcp->unacked_bytes, etcp->window_size);
// Check waiting conditions
if (queue_entry_count(etcp->input_queue) == 0 && etcp->wait_send_list == NULL) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: no packets available, setting callback and returning NULL");
// Wait for input or retrans
// Set callback for resume
queue_set_callback(etcp->input_queue, input_queue_cb, etcp); // Define cb to resume
return NULL;
}
if (etcp->unacked_bytes >= etcp->window_size) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: window full (unacked_bytes=%u >= window_size=%u), waiting",
etcp->unacked_bytes, etcp->window_size);
// Wait ACK or timeout
etcp->wait_timeout_active = 1;
return NULL;
}
if (etcp->unacked_bytes >= etcp->window_size) {
// Wait ACK or timeout
etcp->wait_timeout_active = 1;
return NULL;
}
// Get packet (prefer retrans)
inflight_packet_t* ipkt = etcp->wait_send_list;
if (ipkt) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: using retransmission packet id=%u", ipkt->id);
remove_inflight(etcp, ipkt);
} else {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: getting new packet from input queue");
struct ll_entry* entry = queue_entry_get(etcp->input_queue);
if (!entry) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: no entry available from input queue");
return NULL;
}
ipkt = calloc(1, sizeof(inflight_packet_t));
if (!ipkt) {
DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: failed to allocate inflight_packet_t");
queue_entry_put_first(etcp->input_queue, entry);
return NULL;
}
ipkt->id = etcp->next_tx_id++;
ipkt->data_len = ll_entry_size(entry);
ipkt->data = malloc(ipkt->data_len);
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: created new packet id=%u, data_len=%u",
ipkt->id, ipkt->data_len);
if (!ipkt->data) {
DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: failed to allocate packet data buffer");
free(ipkt);
queue_entry_put_first(etcp->input_queue, entry);
return NULL;
}
memcpy(ipkt->data, ll_entry_data(entry), ipkt->data_len);
ipkt->payload_len = ipkt->data_len; // Assume full is payload for window
queue_entry_free(entry);
}
// Select link
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: selecting link via loadbalancer");
struct ETCP_LINK* link = etcp_loadbalancer_select_link(etcp);
if (!link) {
DEBUG_WARN(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: no suitable link available");
// Put back if new
if (ipkt->send_count == 0) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: putting new packet back to input queue");
struct ll_entry* entry = queue_entry_new(ipkt->data_len);
memcpy(ll_entry_data(entry), ipkt->data, ipkt->data_len);
queue_entry_put_first(etcp->input_queue, entry);
}
free_inflight_packet(ipkt);
return NULL;
}
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: selected link %p", link);
// Build packet buf
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: building packet with optional sections");
uint8_t buf[1600];
uint16_t len = append_optional_sections(etcp, buf, link);
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: optional sections added, len=%u", len);
// Add payload (assume payload includes ID as first 2 bytes)
uint16_t pay_len = ipkt->payload_len + 2; // ID
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: payload section - pay_len=%u (payload_len=%u + 2 for ID)",
pay_len, ipkt->payload_len);
if (len + SECTION_HEADER_SIZE + pay_len > sizeof(buf)) {
DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: packet too large (%u + %u + %u > %u), dropping",
len, SECTION_HEADER_SIZE, pay_len, (unsigned)sizeof(buf));
free_inflight_packet(ipkt);
return NULL;
}
buf[len++] = ETCP_SECTION_PAYLOAD;
buf[len++] = (pay_len >> 8) & 0xFF;
buf[len++] = pay_len & 0xFF;
buf[len++] = (ipkt->id >> 8) & 0xFF;
buf[len++] = ipkt->id & 0xFF;
memcpy(buf + len, ipkt->data, ipkt->payload_len);
len += ipkt->payload_len;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: payload added, total len=%u", len);
// Alloc dgram
struct ETCP_DGRAM* dgram = memory_pool_alloc(etcp->instance->pkt_pool);
if (!dgram) {
DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: failed to allocate dgram from memory pool");
free_inflight_packet(ipkt);
return NULL;
}
dgram->link = link;
dgram->data_len = len;
dgram->noencrypt_len = 0;
dgram->timestamp = get_current_timestamp();
memcpy(dgram->data, buf, len);
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: allocated dgram %p (link=%p, data_len=%u, timestamp=%u)",
dgram, link, len, dgram->timestamp);
// Update inflight
ipkt->last_link = link;
ipkt->last_timestamp = dgram->timestamp;
ipkt->send_count++;
etcp->unacked_bytes += ipkt->payload_len;
etcp->bytes_sent_total += len; // Approx
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: updated inflight - send_count=%u, unacked_bytes=%u, bytes_sent_total=%u",
ipkt->send_count, etcp->unacked_bytes, etcp->bytes_sent_total);
// Move to wait_ack
ipkt->state = INFLIGHT_STATE_WAIT_ACK;
ipkt->next = etcp->wait_ack_list;
etcp->wait_ack_list = ipkt;
// Add to wait_ack list
ipkt->next = etcp->wait_ack_list;
etcp->wait_ack_list = ipkt;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: added packet %u to wait_ack_list", ipkt->id);
// Start retrans timer if empty before
if (etcp->wait_ack_list->next == NULL && !etcp->retrans_timer) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: starting retrans_timer (wait_ack_list was empty)");
etcp->retrans_timer = uasync_set_timeout(etcp->instance->ua, 20, etcp, retrans_timer_cb);
}
// Update load balancer after send (call from connections after actual send)
// etcp_loadbalancer_update_after_send(link, len + headers); // Assume called externally
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_request_pkt: successfully created dgram %p for packet id=%u",
dgram, ipkt->id);
return dgram;
}
// Input queue callback (placeholder to resume load balancer)
static void input_queue_cb(struct ll_queue* q, struct ll_entry* entry, void* arg) {
(void)q;
(void)entry;
struct ETCP_CONN* etcp = arg;
// Resume polling etcp_request_pkt
queue_resume_callback(q);
}
// Append optional (expanded with debug)
static uint16_t append_optional_sections(struct ETCP_CONN* etcp, uint8_t* buf, struct ETCP_LINK* link) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "append_optional_sections: etcp=%p, link=%p", etcp, link);
uint16_t len = 0;
int sections_added = 0;
// Timestamp (assume 2 bytes TS)
uint16_t ts = get_current_timestamp();
buf[len++] = ETCP_SECTION_TIMESTAMP;
buf[len++] = 0; // len high
buf[len++] = 2; // len low
buf[len++] = (ts >> 8) & 0xFF;
buf[len++] = ts & 0xFF;
sections_added++;
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "append_optional_sections: added TIMESTAMP section (ts=%u, len=%u)", ts, len);
// ACK (assume count(1) + [id(2)+ts(2)]*count)
if (etcp->pending_ack_count > 0) {
uint16_t ack_len = 1 + etcp->pending_ack_count * 4;
buf[len++] = ETCP_SECTION_ACK;
buf[len++] = (ack_len >> 8) & 0xFF;
buf[len++] = ack_len & 0xFF;
buf[len++] = etcp->pending_ack_count;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "append_optional_sections: adding ACK section with %u ACKs", etcp->pending_ack_count);
for (uint8_t i = 0; i < etcp->pending_ack_count; i++) {
uint16_t id = etcp->pending_ack_ids[i];
uint16_t ats = etcp->pending_ack_ts[i];
buf[len++] = (id >> 8) & 0xFF;
buf[len++] = id & 0xFF;
buf[len++] = (ats >> 8) & 0xFF;
buf[len++] = ats & 0xFF;
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "append_optional_sections: ACK[%u] - id=%u, ts=%u", i, id, ats);
}
etcp->pending_ack_count = 0;
etcp->ack_packets_count++;
sections_added++;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "append_optional_sections: added ACK section (total_len=%u)", len);
}
// RETRANS (similar: count(1) + id(2)*count)
if (etcp->pending_retrans_count > 0) {
uint16_t ret_len = 1 + etcp->pending_retrans_count * 2;
buf[len++] = ETCP_SECTION_RETRANS;
buf[len++] = (ret_len >> 8) & 0xFF;
buf[len++] = ret_len & 0xFF;
buf[len++] = etcp->pending_retrans_count;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "append_optional_sections: adding RETRANS section with %u requests", etcp->pending_retrans_count);
for (uint8_t i = 0; i < etcp->pending_retrans_count; i++) {
uint16_t id = etcp->pending_retrans_ids[i];
buf[len++] = (id >> 8) & 0xFF;
buf[len++] = id & 0xFF;
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "append_optional_sections: RETRANS[%u] - id=%u", i, id);
}
etcp->pending_retrans_count = 0;
sections_added++;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "append_optional_sections: added RETRANS section (total_len=%u)", len);
}
// MEAS_TS if burst (assume [start_id(2)][n(1)])
if (etcp->burst_in_progress) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "append_optional_sections: burst measurement in progress, would add MEAS_TS");
// Logic for adding to burst packets
// Placeholder
}
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "append_optional_sections: completed - added %u sections, total_len=%u",
sections_added, len);
return len;
}
// Process ACK (expanded)
static void process_section_ack(struct ETCP_CONN* etcp, uint8_t* data, uint16_t len) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_ack: etcp=%p, data=%p, len=%u", etcp, data, len);
if (len < 1) {
DEBUG_WARN(DEBUG_CATEGORY_ETCP, "process_section_ack: invalid length %u", len);
return;
}
uint8_t count = data[0];
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_ack: count=%u", count);
if (1 + count * 4 > len) {
DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "process_section_ack: invalid count %u for len %u", count, len);
return;
}
uint16_t lp_ts = 0;
int acked_count = 0;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_ack: processing %u ACK entries", count);
for (uint8_t i = 0; i < count; i++) {
uint16_t id = (data[1 + i*4] << 8) | data[2 + i*4];
uint16_t ts = (data[3 + i*4] << 8) | data[4 + i*4];
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "process_section_ack: entry %u - id=%u, ts=%u", i, id, ts);
inflight_packet_t* pkt = find_inflight(etcp, id, INFLIGHT_STATE_WAIT_ACK);
if (pkt) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_ack: found inflight packet %u, removing (payload_len=%u)",
id, pkt->payload_len);
etcp->unacked_bytes -= pkt->payload_len;
remove_inflight(etcp, pkt);
free_inflight_packet(pkt);
lp_ts = ts; // Update last positive ts
acked_count++;
} else {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "process_section_ack: no inflight packet found for id=%u", id);
}
}
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_ack: successfully ACKed %u/%u packets", acked_count, count);
// Use lp_ts in retrans_check if needed
etcp->last_rx_ack_id = (data[1 + (count-1)*4] << 8) | data[2 + (count-1)*4]; // Last ACK ID
}
// Process RETRANS (expanded)
static void process_section_retrans(struct ETCP_CONN* etcp, uint8_t* data, uint16_t len) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_retrans: etcp=%p, data=%p, len=%u", etcp, data, len);
if (len < 1) {
DEBUG_WARN(DEBUG_CATEGORY_ETCP, "process_section_retrans: invalid length %u", len);
return;
}
uint8_t count = data[0];
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_retrans: count=%u", count);
if (1 + count * 2 > len) {
DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "process_section_retrans: invalid count %u for len %u", count, len);
return;
}
int retrans_count = 0;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_retrans: processing %u retrans requests", count);
for (uint8_t i = 0; i < count; i++) {
uint16_t id = (data[1 + i*2] << 8) | data[2 + i*2];
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "process_section_retrans: requesting retrans for id=%u", id);
inflight_packet_t* pkt = find_inflight(etcp, id, INFLIGHT_STATE_WAIT_ACK);
if (pkt) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_retrans: found packet %u, marking for retransmission", id);
pkt->retrans_req_count++;
pkt->need_retrans = 1;
move_to_wait_send(etcp, pkt);
retrans_count++;
} else {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "process_section_retrans: no inflight packet found for id=%u", id);
}
}
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_retrans: marked %u/%u packets for retransmission", retrans_count, count);
}
// Process TIMESTAMP (expanded)
static void process_section_timestamp(struct ETCP_CONN* etcp, uint8_t* data, uint16_t len) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_timestamp: etcp=%p, data=%p, len=%u", etcp, data, len);
if (len != 2) {
DEBUG_WARN(DEBUG_CATEGORY_ETCP, "process_section_timestamp: invalid length %u (expected 2)", len);
return;
}
uint16_t recv_ts = (data[0] << 8) | data[1];
uint16_t current_ts = get_current_timestamp();
uint16_t rtt = timestamp_diff(current_ts, recv_ts);
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_timestamp: recv_ts=%u, current_ts=%u, calculated_rtt=%u",
recv_ts, current_ts, rtt);
update_rtt(etcp, rtt);
}
// Process PAYLOAD (expanded)
static void process_section_payload(struct ETCP_CONN* etcp, uint8_t* data, uint16_t len) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_payload: etcp=%p, data=%p, len=%u", etcp, data, len);
if (len < 2) {
DEBUG_WARN(DEBUG_CATEGORY_ETCP, "process_section_payload: invalid length %u (minimum 2)", len);
return;
}
uint16_t id = (data[0] << 8) | data[1];
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_payload: packet id=%u, last_rx_id=%u", id, etcp->last_rx_id);
if (id <= etcp->last_rx_id) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "process_section_payload: duplicate packet id=%u (last_rx_id=%u), ignoring",
id, etcp->last_rx_id);
return; // Dup
}
rx_packet_t* new_rx = calloc(1, sizeof(rx_packet_t));
if (!new_rx) {
DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "process_section_payload: failed to allocate rx_packet_t");
return;
}
new_rx->id = id;
new_rx->timestamp = get_current_timestamp();
new_rx->data_len = len - 2;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_payload: allocated rx_packet %p (id=%u, data_len=%u, timestamp=%u)",
new_rx, new_rx->id, new_rx->data_len, new_rx->timestamp);
new_rx->data = malloc(new_rx->data_len);
if (!new_rx->data) {
DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "process_section_payload: failed to allocate rx data buffer (size=%u)", new_rx->data_len);
free(new_rx);
return;
}
memcpy(new_rx->data, data + 2, new_rx->data_len);
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_payload: copied %u bytes of payload data", new_rx->data_len);
// Insert sorted (assume IDs sequential, no wrap for simplicity)
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "process_section_payload: inserting packet into rx_list (id=%u)", id);
rx_packet_t** ptr = &etcp->rx_list;
while (*ptr && (*ptr)->id < id) ptr = &(*ptr)->next;
if (*ptr && (*ptr)->id == id) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "process_section_payload: duplicate packet id=%u found in rx_list, discarding", id);
free(new_rx->data);
free(new_rx);
return;
}
new_rx->next = *ptr;
*ptr = new_rx;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_payload: successfully inserted packet id=%u into rx_list", id);
if (id > etcp->last_rx_id) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "process_section_payload: updating last_rx_id from %u to %u",
etcp->last_rx_id, id);
etcp->last_rx_id = id;
}
// Pending ACK
if (etcp->pending_ack_count < MAX_PENDING) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "process_section_payload: adding packet id=%u to pending ACKs (count=%u)",
id, etcp->pending_ack_count + 1);
etcp->pending_ack_ids[etcp->pending_ack_count] = id;
etcp->pending_ack_ts[etcp->pending_ack_count++] = new_rx->timestamp;
} else {
DEBUG_WARN(DEBUG_CATEGORY_ETCP, "process_section_payload: pending ACK buffer full (%u), cannot add id=%u",
MAX_PENDING, id);
}
// Schedule ACK
if (!etcp->ack_timer) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_payload: scheduling ACK timer (delay=%u tb)", ACK_DELAY_TB);
etcp->ack_timer = uasync_set_timeout(etcp->instance->ua, ACK_DELAY_TB, etcp, ack_timer_cb);
}
etcp->bytes_received_total += len;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_payload: packet id=%u processed successfully, bytes_received_total=%u",
id, etcp->bytes_received_total);
}
// Process MEAS_TS (expanded: send resp)
static void process_section_meas_ts(struct ETCP_CONN* etcp, uint8_t* data, uint16_t len) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_meas_ts: etcp=%p, data=%p, len=%u", etcp, data, len);
if (len < 3) {
DEBUG_WARN(DEBUG_CATEGORY_ETCP, "process_section_meas_ts: invalid length %u (minimum 3)", len);
return;
}
uint16_t start_id = (data[0] << 8) | data[1];
uint8_t n = data[2];
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_meas_ts: start_id=%u, n=%u", start_id, n);
// Send MEAS_RESP (add to pending or direct)
// Placeholder: assume added to next packet
DEBUG_INFO(DEBUG_CATEGORY_ETCP, "MEAS_TS: start_id=%u n=%u", start_id, n);
// Build resp [start_id(2)][n(1)][recv_ts(2)]
// But since appended in optional, set state
}
// Process MEAS_RESP (expanded: calc bw)
static void process_section_meas_resp(struct ETCP_CONN* etcp, uint8_t* data, uint16_t len) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_meas_resp: etcp=%p, data=%p, len=%u", etcp, data, len);
// Assume format [start_id(2)][n(1)][recv_ts(2)]
if (len < 5) {
DEBUG_WARN(DEBUG_CATEGORY_ETCP, "process_section_meas_resp: invalid length %u (minimum 5)", len);
return;
}
uint16_t start_id = (data[0] << 8) | data[1];
uint8_t n = data[2];
uint16_t recv_ts = (data[3] << 8) | data[4];
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "process_section_meas_resp: start_id=%u, n=%u, recv_ts=%u", start_id, n, recv_ts);
if (etcp->burst_start_id != start_id || !etcp->burst_in_progress) return;
// Calc bw based on burst (placeholder logic)
uint16_t delta = timestamp_diff(get_current_timestamp(), recv_ts);
uint32_t bw = (BURST_SIZE * etcp->mtu * 8) / (delta / 1000.0); // bits/sec approx
update_link_bandwidth(etcp->links, bw); // Assume primary link
etcp->burst_in_progress = 0;
}
// Detect gaps (expanded)
static void detect_gaps_and_request_retrans(struct ETCP_CONN* etcp) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "detect_gaps_and_request_retrans: etcp=%p, last_delivered_id=%u",
etcp, etcp->last_delivered_id);
rx_packet_t* rx = etcp->rx_list;
uint16_t expected = etcp->last_delivered_id + 1;
int gaps_found = 0;
int retrans_requested = 0;
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "detect_gaps_and_request_retrans: starting gap detection from expected_id=%u", expected);
while (rx) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "detect_gaps_and_request_retrans: checking rx packet id=%u (expected=%u)",
rx->id, expected);
if (rx->id > expected) {
// Gap: add retrans for expected to rx->id -1
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "detect_gaps_and_request_retrans: gap detected - expected=%u, found=%u",
expected, rx->id);
gaps_found++;
for (uint16_t gid = expected; gid < rx->id && etcp->pending_retrans_count < MAX_PENDING; gid++) {
etcp->pending_retrans_ids[etcp->pending_retrans_count++] = gid;
retrans_requested++;
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "detect_gaps_and_request_retrans: queued retrans request for id=%u", gid);
}
expected = rx->id + 1;
} else if (rx->id == expected) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "detect_gaps_and_request_retrans: found expected packet id=%u", expected);
expected++;
} else {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "detect_gaps_and_request_retrans: packet id=%u < expected=%u, already processed",
rx->id, expected);
}
rx = rx->next;
}
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "detect_gaps_and_request_retrans: completed - gaps_found=%d, retrans_requested=%u",
gaps_found, retrans_requested);
}
// Deliver contiguous (expanded)
static void deliver_contiguous_packets(struct ETCP_CONN* etcp) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "deliver_contiguous_packets: etcp=%p, last_delivered_id=%u",
etcp, etcp->last_delivered_id);
rx_packet_t** ptr = &etcp->rx_list;
int delivered_count = 0;
uint32_t delivered_bytes = 0;
while (*ptr && (*ptr)->id == etcp->last_delivered_id + 1) {
rx_packet_t* rx = *ptr;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "deliver_contiguous_packets: delivering packet id=%u (data_len=%u)",
rx->id, rx->data_len);
struct ll_entry* entry = queue_entry_new(rx->data_len);
if (entry) {
memcpy(ll_entry_data(entry), rx->data, rx->data_len);
queue_entry_put(etcp->output_queue, entry);
delivered_bytes += rx->data_len;
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "deliver_contiguous_packets: queued packet id=%u to output_queue", rx->id);
} else {
DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "deliver_contiguous_packets: failed to allocate queue entry for packet id=%u", rx->id);
}
etcp->last_delivered_id = rx->id;
*ptr = rx->next;
free(rx->data);
free(rx);
delivered_count++;
}
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "deliver_contiguous_packets: delivered %u contiguous packets (%u bytes), last_delivered_id=%u",
delivered_count, delivered_bytes, etcp->last_delivered_id);
}
// Retrans check (expanded with lp_ts)
static void retrans_check(struct ETCP_CONN* etcp) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "retrans_check: etcp=%p, wait_ack_list=%p, rtt_avg_10=%u, jitter=%u",
etcp, etcp->wait_ack_list, etcp->rtt_avg_10, etcp->jitter);
uint64_t now = get_current_time_units();
inflight_packet_t** ptr = &etcp->wait_ack_list;
uint16_t lp_ts = 0;
int checked_packets = 0;
int retrans_packets = 0;
uint16_t timeout_calc = (uint16_t)(etcp->rtt_avg_10 * RETRANS_K1 + etcp->jitter * RETRANS_K2);
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "retrans_check: timeout calculation: rtt_avg_10=%u * %.1f + jitter=%u * %.1f = %u",
etcp->rtt_avg_10, RETRANS_K1, etcp->jitter, RETRANS_K2, timeout_calc);
while (*ptr) {
inflight_packet_t* pkt = *ptr;
checked_packets++;
uint16_t timeout = (uint16_t)(etcp->rtt_avg_10 * RETRANS_K1 + etcp->jitter * RETRANS_K2);
uint16_t time_since_send = timestamp_diff(now, pkt->last_timestamp);
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "retrans_check: checking packet id=%u (time_since_send=%u, timeout=%u, need_retrans=%u)",
pkt->id, time_since_send, timeout, pkt->need_retrans);
if (time_since_send > timeout) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "retrans_check: packet id=%u timed out, marking for retransmission", pkt->id);
pkt->need_retrans = 1;
move_to_wait_send(etcp, pkt);
etcp->retransmissions_count++;
retrans_packets++;
ptr = &etcp->wait_ack_list; // Restart scan after move
continue;
}
// lp_ts logic (per spec: if acked, remember ts; if later unacked with ts < lp_ts, ?)
// Assume if pkt acked (but shouldn't be in list), or for forward progress
ptr = &pkt->next;
}
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "retrans_check: completed - checked %d packets, retransmitted %d packets, total_retransmissions=%u",
checked_packets, retrans_packets, etcp->retransmissions_count);
// Reschedule if list not empty
if (etcp->wait_ack_list) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "retrans_check: rescheduling retrans_timer (wait_ack_list not empty)");
etcp->retrans_timer = uasync_set_timeout(etcp->instance->ua, 20, etcp, retrans_timer_cb);
} else {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "retrans_check: clearing retrans_timer (wait_ack_list empty)");
etcp->retrans_timer = NULL;
}
}
// Find inflight (expanded)
static inflight_packet_t* find_inflight(struct ETCP_CONN* etcp, uint16_t id, uint8_t state) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "find_inflight: etcp=%p, id=%u, state=%u", etcp, id, state);
inflight_packet_t* list = (state == INFLIGHT_STATE_WAIT_ACK) ? etcp->wait_ack_list : etcp->wait_send_list;
inflight_packet_t* pkt = list;
int position = 0;
while (pkt && pkt->id != id) {
pkt = pkt->next;
position++;
}
if (pkt) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "find_inflight: found packet %u at position %d in %s list",
id, position, (state == INFLIGHT_STATE_WAIT_ACK) ? "wait_ack" : "wait_send");
} else {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "find_inflight: packet %u not found in %s list",
id, (state == INFLIGHT_STATE_WAIT_ACK) ? "wait_ack" : "wait_send");
}
return pkt;
return pkt;
}
// Move to wait_send (expanded)
static void move_to_wait_send(struct ETCP_CONN* etcp, inflight_packet_t* pkt) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "move_to_wait_send: etcp=%p, pkt=%p (id=%u, state=%u)",
etcp, pkt, pkt->id, pkt->state);
remove_inflight(etcp, pkt);
pkt->state = INFLIGHT_STATE_WAIT_SEND;
pkt->next = etcp->wait_send_list;
etcp->wait_send_list = pkt;
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "move_to_wait_send: moved packet %u to wait_send_list", pkt->id);
}
// Remove inflight (expanded)
static void remove_inflight(struct ETCP_CONN* etcp, inflight_packet_t* pkt) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "remove_inflight: etcp=%p, pkt=%p (id=%u, state=%u)",
etcp, pkt, pkt->id, pkt->state);
inflight_packet_t** list = (pkt->state == INFLIGHT_STATE_WAIT_ACK) ? &etcp->wait_ack_list : &etcp->wait_send_list;
inflight_packet_t** ptr = list;
int position = 0;
while (*ptr && *ptr != pkt) {
ptr = &(*ptr)->next;
position++;
}
if (*ptr) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "remove_inflight: found packet %u at position %d in %s list",
pkt->id, position, (pkt->state == INFLIGHT_STATE_WAIT_ACK) ? "wait_ack" : "wait_send");
*ptr = (*ptr)->next;
} else {
DEBUG_WARN(DEBUG_CATEGORY_ETCP, "remove_inflight: packet %u not found in %s list",
pkt->id, (pkt->state == INFLIGHT_STATE_WAIT_ACK) ? "wait_ack" : "wait_send");
}
}
// Start burst (placeholder expanded)
static void start_burst_measurement(struct ETCP_CONN* etcp, struct ETCP_LINK* link) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "start_burst_measurement: etcp=%p, link=%p", etcp, link);
// Periodically call this
etcp->burst_in_progress = 1;
uint16_t old_start_id = etcp->burst_start_id;
etcp->burst_start_id = etcp->next_tx_id;
DEBUG_INFO(DEBUG_CATEGORY_ETCP, "start_burst_measurement: started burst measurement - burst_start_id=%u (was %u)",
etcp->burst_start_id, old_start_id);
// Delay first, then burst 4
// Assume handled in request_pkt by adding meas_ts to next BURST_SIZE pkts
}
// Update link bw (expanded)
static void update_link_bandwidth(struct ETCP_LINK* link, uint32_t new_bw) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "update_link_bandwidth: link=%p, new_bw=%u bits/sec (current=%u)",
link, new_bw, link->bandwidth);
uint32_t old_bw = link->bandwidth;
link->bandwidth = (uint32_t)((link->bandwidth * 0.9) + (new_bw * 0.1)); // Smooth
DEBUG_INFO(DEBUG_CATEGORY_ETCP, "update_link_bandwidth: updated link bandwidth from %u to %u bits/sec (new_bw=%u)",
old_bw, link->bandwidth, new_bw);
}
// Update RTT (expanded with history)
static void update_rtt(struct ETCP_CONN* etcp, uint16_t new_rtt) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "update_rtt: etcp=%p, new_rtt=%u (last_rtt=%u, avg_10=%u, avg_100=%u)",
etcp, new_rtt, etcp->rtt_last, etcp->rtt_avg_10, etcp->rtt_avg_100);
etcp->rtt_last = new_rtt;
etcp->rtt_avg_10 = (etcp->rtt_avg_10 * 9 + new_rtt) / 10;
etcp->rtt_avg_100 = (etcp->rtt_avg_100 * 99 + new_rtt) / 100;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "update_rtt: updated RTT metrics - last=%u, avg_10=%u, avg_100=%u",
etcp->rtt_last, etcp->rtt_avg_10, etcp->rtt_avg_100);
// History for jitter
etcp->rtt_history[etcp->rtt_history_idx++] = new_rtt;
if (etcp->rtt_history_idx >= RTT_HISTORY_SIZE) etcp->rtt_history_idx = 0;
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "update_rtt: stored RTT in history at index %u",
(etcp->rtt_history_idx + RTT_HISTORY_SIZE - 1) % RTT_HISTORY_SIZE);
calculate_jitter(etcp);
}
static void calculate_jitter(struct ETCP_CONN* etcp) {
uint16_t min_rtt = UINT16_MAX;
uint16_t max_rtt = 0;
int valid_samples = 0;
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "calculate_jitter: analyzing RTT history (history_idx=%u)", etcp->rtt_history_idx);
for (int i = 0; i < RTT_HISTORY_SIZE; i++) {
if (etcp->rtt_history[i] == 0) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "calculate_jitter: history[%d] = 0 (invalid), skipping", i);
continue;
}
valid_samples++;
if (etcp->rtt_history[i] < min_rtt) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "calculate_jitter: new min_rtt=%u (was %u) at history[%d]",
etcp->rtt_history[i], min_rtt, i);
min_rtt = etcp->rtt_history[i];
}
if (etcp->rtt_history[i] > max_rtt) {
DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "calculate_jitter: new max_rtt=%u (was %u) at history[%d]",
etcp->rtt_history[i], max_rtt, i);
max_rtt = etcp->rtt_history[i];
}
}
uint16_t old_jitter = etcp->jitter;
etcp->jitter = max_rtt - min_rtt;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "calculate_jitter: completed - valid_samples=%d, min_rtt=%u, max_rtt=%u, jitter=%u (was %u)",
valid_samples, min_rtt, max_rtt, etcp->jitter, old_jitter);
}
// Timers (expanded with debug)
static void retrans_timer_cb(void* arg) {
struct ETCP_CONN* etcp = (struct ETCP_CONN*)arg;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "retrans_timer_cb: etcp=%p, triggered retransmission check", etcp);
retrans_check(etcp);
}
static void ack_timer_cb(void* arg) {
struct ETCP_CONN* etcp = (struct ETCP_CONN*)arg;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "ack_timer_cb: etcp=%p, processing pending ACKs", etcp);
etcp->ack_timer = NULL;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "ack_timer_cb: processing %u pending ACKs", etcp->pending_ack_count);
// Force send ACK if pending (e.g., empty payload pkt)
// For now, assume appended next
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "ack_timer_cb: ACK processing completed");
}
// Get stats (expanded)
void etcp_get_stats(struct ETCP_CONN* etcp, size_t* packets_sent, size_t* packets_recv,
size_t* pool_allocs, size_t* pool_reuse) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_get_stats: etcp=%p", etcp);
if (packets_sent) {
*packets_sent = etcp->total_packets_sent;
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_get_stats: total_packets_sent=%zu", *packets_sent);
}
if (packets_recv) {
*packets_recv = etcp->bytes_received_total / 1400; // Approx MTU
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_get_stats: bytes_received_total=%u, estimated_packets=%zu",
etcp->bytes_received_total, *packets_recv);
}
if (pool_allocs || pool_reuse) {
DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_get_stats: getting memory pool stats");
memory_pool_get_stats(etcp->instance->pkt_pool, pool_allocs, pool_reuse);
if (pool_allocs) DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_get_stats: pool_allocs=%zu", *pool_allocs);
if (pool_reuse) DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "etcp_get_stats: pool_reuse=%zu", *pool_reuse);
}
}