jeka
/
utun2
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
Browse Source

feat: 1-byte flags in SVC_ROUTE_HDR — START, RST, 2-bit sess_id 

SVC_ROUTE_HDR: +uint8_t flags (23 bytes total).
  bit7=START (0x80) — first data packet of new session
  bit6=RST (0x40) — sequence violation detected
  bit5-4=sess_id (0-3) — cyclically incremented on restart

router_send_one_flags: sets START+sess_id on first data packet.
router_send_ack: sets sess_id only (no START for ACK).
etcp_router_recv_cb: detects restart via sess_id change or START flag.
  Old seq=0 heuristic replaced with explicit flags.
etcp_router_conn_get: init sess_id=0, peer_sess_id=0, start_sent=0.
etcp_router_conn_restart: increment sess_id before closing rconn.
etcp-inflight-fix
Evgeny 4 months ago
parent
ca7f6c0d01
commit
d0029178e7
2 changed files with 49 additions and 9 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 43
      src/etcp_router.c
  2. 15
      src/etcp_router.h

43
src/etcp_router.c
Unescape View File

@ -64,6 +64,14 @@ static int router_send_one_flags(struct ETCP_ROUTER_CONN* rconn, const uint8_t*
hdr->src_node_id = inst->node_id;
hdr->seq = seq;
hdr->svc_id = rconn->svc_id;
{
uint8_t f = (rconn->sess_id << ROUTER_SESS_ID_SHIFT);
if (!rconn->start_sent && pl_len > 0 && !(seq_flags & (ROUTER_SEQ_CLOSE_FLAG | ROUTER_SEQ_RST_FLAG))) {
f |= ROUTER_FLAG_START;
rconn->start_sent = 1;
}
hdr->flags = f;
}
if (pl_len > 0) memcpy(dgram + SVC_ROUTE_HDR_SIZE, payload, pl_len);
struct ll_entry* entry = queue_entry_new(0);
@ -222,6 +230,7 @@ static void router_send_ack(struct ETCP_ROUTER_CONN* rconn) {
hdr->src_node_id = inst->node_id;
hdr->seq = rconn->rx_seq;
hdr->svc_id = rconn->svc_id;
hdr->flags = (rconn->sess_id << ROUTER_SESS_ID_SHIFT);
struct ll_entry* entry = queue_entry_new(0);
if (!entry) { u_free(hdr); return; }
@ -368,13 +377,27 @@ static void etcp_router_recv_cb(struct ETCP_CONN* conn, struct ll_entry* entry)
if (!rconn) { queue_dgram_free(entry); queue_entry_free(entry); return; }
}
// Обнаружение перезапуска peer'a: seq=0 при rx_seq >= MAX_INFLIGHT
if (rconn->rx_seq >= (uint32_t)ROUTER_MAX_INFLIGHT && hdr->seq == 0 && pl_len > 0) {
DEBUG_INFO(DEBUG_CATEGORY_ETCPROUTE, "router: peer restart detected svc_id=%u from %016llx — resetting",
hdr->svc_id, (unsigned long long)hdr->src_node_id);
etcp_router_conn_restart(inst, hdr->src_node_id, hdr->svc_id);
rconn = etcp_router_conn_get(inst, hdr->src_node_id, hdr->svc_id);
if (!rconn) { queue_dgram_free(entry); queue_entry_free(entry); return; }
// Обнаружение перезапуска peer'а: новый sess_id или START-флаг
{
uint8_t incoming_sess = (hdr->flags >> ROUTER_SESS_ID_SHIFT) & 0x3;
if (pl_len > 0 && (incoming_sess != rconn->peer_sess_id || (hdr->flags & ROUTER_FLAG_START))) {
DEBUG_INFO(DEBUG_CATEGORY_ETCPROUTE,
"router: peer restart sess_id=%u→%u svc_id=%u from %016llx",
rconn->peer_sess_id, incoming_sess, hdr->svc_id,
(unsigned long long)hdr->src_node_id);
etcp_router_conn_restart(inst, hdr->src_node_id, hdr->svc_id);
rconn = etcp_router_conn_get(inst, hdr->src_node_id, hdr->svc_id);
if (!rconn) { queue_dgram_free(entry); queue_entry_free(entry); return; }
rconn->peer_sess_id = incoming_sess;
}
// RST-флаг — peer сигналит нарушение последовательности
if (hdr->flags & ROUTER_FLAG_RST) {
DEBUG_INFO(DEBUG_CATEGORY_ETCPROUTE,
"router: RST from %016llx svc_id=%u",
(unsigned long long)hdr->src_node_id, hdr->svc_id);
router_close_and_notify(rconn);
rconn = NULL;
}
}
// Seq-состояние есть — reorder
@ -589,6 +612,9 @@ void etcp_router_conn_restart(struct UTUN_INSTANCE* inst, uint64_t remote_node_i
DEBUG_INFO(DEBUG_CATEGORY_ETCPROUTE, "router_restart: svc_id=%u remote=%016llx — notifying service",
svc_id, (unsigned long long)remote_node_id);
rconn->sess_id = (rconn->sess_id + 1) & 0x3;
rconn->start_sent = 0;
etcp_recv_fn cb = inst->router_bindings.callbacks[svc_id];
if (cb) {
struct ll_entry* e = queue_entry_new(0);
@ -633,6 +659,9 @@ struct ETCP_ROUTER_CONN* etcp_router_conn_get(struct UTUN_INSTANCE* inst,
rconn->idle_ack_timer = NULL;
rconn->send_blocked = 0;
rconn->send_resume_timer = NULL;
rconn->sess_id = 0;
rconn->peer_sess_id = 0;
rconn->start_sent = 0;
rconn->recv_q = queue_new(inst->ua, ROUTER_RECVQ_HASH_SIZE, 0, 4, "router_recv_q");
if (!rconn->recv_q) { DEBUG_ERROR(DEBUG_CATEGORY_ETCPROUTE, "router_conn_get: queue_new(recv_q) failed"); queue_entry_free(&rconn->ll); return NULL; }
rconn->send_q = queue_new(inst->ua, 0, 0, 0, "router_send_q");

15
src/etcp_router.h
Unescape View File

@ -3,7 +3,8 @@
// Упрощённый TCP поверх ETCP: восстановление порядка, дедупликация, без переповторов
//
// Формат SVC_ROUTE пакета:
// [cmd:1] [dst_node_id:8] [src_node_id:8] [seq:4] [svc_id:1] [payload...]
// [cmd:1] [dst_node_id:8] [src_node_id:8] [seq:4] [svc_id:1] [flags:1] [payload...]
// flags: bit7=START, bit6=RST, bit5-4=sess_id(0-3)
// ACK-пакет: тот же заголовок, seq=rx_seq, payload_len=0
#ifndef ETCP_ROUTER_H
#define ETCP_ROUTER_H
@ -18,11 +19,18 @@ struct SVC_ROUTE_HDR {
uint64_t src_node_id;
uint32_t seq; // data: tx_seq; ACK: rx_seq (ожидаемый seq)
uint8_t svc_id; // идентификатор сервиса
uint8_t flags; // bit7=START, bit6=RST, bit5-4=sess_id
};
#pragma pack(pop)
#define SVC_ROUTE_HDR_SIZE sizeof(struct SVC_ROUTE_HDR) // 22
#define SVC_ROUTE_HDR_SIZE sizeof(struct SVC_ROUTE_HDR) // 23
#define SVC_ROUTE_MAX_BINDINGS 256
// Биты в flags
#define ROUTER_FLAG_START 0x80
#define ROUTER_FLAG_RST 0x40
#define ROUTER_SESS_ID_SHIFT 4
#define ROUTER_SESS_ID_MASK 0x30
// Состояние одного логического подключения (remote_node_id + svc_id)
struct ETCP_ROUTER_CONN {
struct ll_entry ll; // data[0..7]=remote_node_id, data[8]=svc_id — хеш-индекс
@ -45,6 +53,9 @@ struct ETCP_ROUTER_CONN {
struct ll_queue* send_q; // очередь ожидающих отправки (inflight полон)
void* send_resume_timer; // таймер возобновления отправки
uint8_t send_blocked; // 1 = inflight полон, ждём ack/таймер
uint8_t sess_id; // наш session id (0-3)
uint8_t peer_sess_id; // последний sess_id от peer'а
uint8_t start_sent; // 0 = нужно отправить START в первом data
};
#define ROUTER_CONN_HASH_SIZE 256

Write Preview
Loading…
Cancel
Save