feature: support session manager scan

src/session/session_private.h

@@ -0,0 +1,80 @@
+#pragma once
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include "list.h"
+#include "tuple.h"
+#include "uthash.h"
+#include "timeout.h"
+#include "packet_private.h"
+#include "stellar/session.h"
+#include "tcp_reassembly.h"
+
+#define EX_DATA_MAX_COUNT 4
+
+// output format: "${src_addr}:${src_port}-${dst_addr}:${dst_port}-${ip_proto}-${domain}"
+// output max len: (46 + 1 + 5) + 1 + (46 + 1 + 5) + 1 + 1 + 1 + 20 = 129
+#define TUPLE6_STR_SIZE 130
+
+struct tcp_half
+{
+    struct tcp_reassembly *assembler;
+    struct tcp_segment in_order; // current packet in order segment
+    uint32_t in_order_ref;       // reference count of current packet in order segment
+
+    uint32_t seq;  // current packet sequence number
+    uint32_t ack;  // current packet ack number
+    uint16_t len;  // current packet payload length
+    uint8_t flags; // current packet flags
+
+    uint32_t isn;    // current direction initial sequence number
+    uint8_t history; // current direction received flags
+};
+
+/*
+ * sizeof(struct session) > 1024 bytes
+ * max thread number = 128
+ * per thread max tcp session number = 50000
+ * per thread max udp session number = 50000
+ *
+ * session memory usage = 128 * (50000 + 50000) * 1024 = 13107200000 bytes = 12.2 GB
+ */
+struct session
+{
+    uint64_t id;
+    uint64_t stats[MAX_FLOW_DIRECTION][MAX_STAT];
+    uint64_t timestamps[MAX_TIMESTAMP]; // realtime msec
+    struct tcp_half tcp_halfs[MAX_FLOW_DIRECTION];
+    struct timeout timeout;
+    struct list_head lru;
+    struct list_head free;
+    struct list_head evicte;
+    UT_hash_handle hh1;
+    UT_hash_handle hh2;
+    UT_hash_handle hh3;
+    struct tuple6 tuple;
+    char tuple_str[TUPLE6_STR_SIZE];
+    struct sids sids[MAX_FLOW_DIRECTION];
+    struct route_ctx route_ctx[MAX_FLOW_DIRECTION];
+    const struct packet *first_pkt[MAX_FLOW_DIRECTION];
+    const struct packet *curr_pkt;
+    void *ex_data[EX_DATA_MAX_COUNT];
+    void *user_data;
+    int is_symmetric;
+    int dup;
+    enum session_direction sess_dir;
+    enum flow_direction tuple_dir;
+    enum flow_direction flow_dir;
+    enum session_type type;
+    enum session_state state;
+    enum closing_reason reason;
+    struct session_manager *mgr;
+    struct session_manager_stat *mgr_stat;
+};
+
+#ifdef __cplusplus
+}
+#endif