1075 lines
38 KiB
C
1075 lines
38 KiB
C
/*
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* Copyright (c) 2021 Apple Inc. All rights reserved.
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*/
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#include <sys/types.h>
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#include <sys/kern_control.h>
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#include <sys/queue.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/syslog.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/socketvar.h>
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#include <IOKit/IOBSD.h>
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#include <kern/sched_prim.h>
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#include <kern/locks.h>
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#include <kern/zalloc.h>
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#include <kern/debug.h>
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#include <net/necp.h>
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#define _IP_VHL
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#include <netinet/ip.h>
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#include <netinet/in_pcb.h>
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#include <string.h>
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#include <libkern/libkern.h>
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extern int tcp_tcbhashsize;
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int tracker_log_level = LOG_ERR;
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static os_log_t tracker_db_log_handle = NULL;
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/*
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* Tracker Entry Garbage Collection:
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*/
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static struct thread *g_tracker_gc_thread;
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#define TRACKER_GC_RUN_INTERVAL_NSEC (10 * NSEC_PER_SEC) // GC wakes up periodically
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#define TRACKER_GC_IDLE_TO (10) // age out entries when not used for a while
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static int tracker_db_idle_timeout = TRACKER_GC_IDLE_TO;
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/*
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* Sysctls for debug logs control
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*/
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SYSCTL_NODE(_net, OID_AUTO, tracker, CTLFLAG_RW | CTLFLAG_LOCKED, 0, "tracker");
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SYSCTL_INT(_net_tracker, OID_AUTO, log, CTLFLAG_RW | CTLFLAG_LOCKED,
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&tracker_log_level, 0, "");
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SYSCTL_INT(_net_tracker, OID_AUTO, idle_timeout, CTLFLAG_RW | CTLFLAG_LOCKED,
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&tracker_db_idle_timeout, 0, "");
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#define TRACKER_LOG(level, fmt, ...) \
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do { \
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if (tracker_log_level >= level && tracker_db_log_handle) { \
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if (level == LOG_ERR) { \
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os_log_error(tracker_db_log_handle, "TRACKER - %s:%d " fmt "\n", __FUNCTION__, __LINE__, ##__VA_ARGS__); \
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} else { \
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os_log(tracker_db_log_handle, "TRACKER - %s:%d " fmt "\n", __FUNCTION__, __LINE__, ##__VA_ARGS__); \
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} \
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} \
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} while (0)
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#define TRACKER_ENTRY_LOG(level, msg, entry, hash) \
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do { \
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if (tracker_log_level >= level) { \
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tracker_entry_log(level, msg, entry, hash); \
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} \
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} while (0)
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#define TRACKERHASHSIZE tcp_tcbhashsize
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#define TRACKER_HASH_UUID_TO_BYTE(uuidptr) \
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( ((uint8_t *)uuidptr)[0] ^ ((uint8_t *)uuidptr)[1] ^ ((uint8_t *)uuidptr)[2] ^ ((uint8_t *)uuidptr)[3] ^ \
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((uint8_t *)uuidptr)[4] ^ ((uint8_t *)uuidptr)[5] ^ ((uint8_t *)uuidptr)[6] ^ ((uint8_t *)uuidptr)[7] ^ \
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((uint8_t *)uuidptr)[8] ^ ((uint8_t *)uuidptr)[9] ^ ((uint8_t *)uuidptr)[10] ^ ((uint8_t *)uuidptr)[11] ^ \
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((uint8_t *)uuidptr)[12] ^ ((uint8_t *)uuidptr)[13] ^ ((uint8_t *)uuidptr)[14] ^ ((uint8_t *)uuidptr)[15] )
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#define TRACKER_HASH_WORD_TO_BYTE(wordptr) \
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( ((uint8_t *)wordptr)[0] ^ ((uint8_t *)wordptr)[1] ^ ((uint8_t *)wordptr)[2] ^ ((uint8_t *)wordptr)[3] )
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#define TRACKER_HASH(uuidptr, wordptr0, wordptr1, wordptr2, wordptr3) \
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( TRACKER_HASH_WORD_TO_BYTE(wordptr0) ^ TRACKER_HASH_WORD_TO_BYTE(wordptr1) ^ TRACKER_HASH_WORD_TO_BYTE(wordptr2) ^ TRACKER_HASH_WORD_TO_BYTE(wordptr3) ^ \
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TRACKER_HASH_UUID_TO_BYTE(uuidptr) )
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#define TRACKER_SCRATCH_PAD_SIZE 200
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#define TRACKER_DUMP_SCRATCH_PAD_SIZE 2048
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#define TRACKER_TLV_HDR_LEN (sizeof(u_int8_t) + sizeof(u_int32_t))
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#define TRACKER_BUFFER_ALLOC_MAX (1024 * 200)
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static uint8_t scratch_pad_all[TRACKER_DUMP_SCRATCH_PAD_SIZE];
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static uint8_t scratch_pad_entry[TRACKER_SCRATCH_PAD_SIZE];
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#define TRACKER_HASH_ENTRY_HEADER_FIELDS \
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LIST_ENTRY(tracker_hash_entry) entry_link; \
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uuid_t app_uuid; \
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sa_family_t address_family; \
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union { \
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struct in_addr_4in6 addr46; \
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struct in6_addr addr6; \
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} address; \
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u_int64_t lastused;
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typedef struct tracker_hash_entry {
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TRACKER_HASH_ENTRY_HEADER_FIELDS
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tracker_metadata_t metadata;
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} tracker_hash_entry_t;
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typedef struct tracker_hash_entry_short {
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TRACKER_HASH_ENTRY_HEADER_FIELDS
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tracker_metadata_short_t metadata;
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} tracker_hash_entry_short_t;
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LIST_HEAD(trackerhashhead, tracker_hash_entry);
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struct tracker_db {
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struct trackerhashhead *tracker_hashbase;
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u_long tracker_hashmask;
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uint32_t tracker_count;
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uint32_t tracker_count_short;
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uint32_t max_link_count;
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};
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static KALLOC_TYPE_DEFINE(tracker_hash_entry_zone,
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struct tracker_hash_entry, NET_KT_DEFAULT);
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static KALLOC_TYPE_DEFINE(tracker_hash_entry_short_zone,
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struct tracker_hash_entry_short, NET_KT_DEFAULT);
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static struct tracker_db g_tracker_db = { };
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static LCK_GRP_DECLARE(g_tracker_lck_grp, "tracker");
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static LCK_RW_DECLARE(g_tracker_lck_rw, &g_tracker_lck_grp);
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#define TRACKER_LOCK_EXCLUSIVE lck_rw_lock_exclusive(&g_tracker_lck_rw);
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#define TRACKER_UNLOCK_EXCLUSIVE lck_rw_unlock_exclusive(&g_tracker_lck_rw);
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#define TRACKER_LOCK_SHARED lck_rw_lock_shared(&g_tracker_lck_rw);
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#define TRACKER_UNLOCK_SHARED lck_rw_unlock_shared(&g_tracker_lck_rw);
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static void tracker_gc_thread_func(void *v, wait_result_t w);
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static void tracker_entry_expire(void *v, wait_result_t w);
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#define ALLOC_ENTRY(flags, entry) \
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if (flags & SO_TRACKER_ATTRIBUTE_FLAGS_DOMAIN_SHORT) { \
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tracker_hash_entry_short_t *short_entry = zalloc_flags(tracker_hash_entry_short_zone, Z_WAITOK | Z_ZERO | Z_NOFAIL); \
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if (short_entry == NULL) { \
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TRACKER_LOG(LOG_ERR, "Failed to allocate tracker IP entry (Short)"); \
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} else { \
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entry = (tracker_hash_entry_t *)short_entry; \
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} \
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} else { \
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entry = zalloc_flags(tracker_hash_entry_zone, Z_WAITOK | Z_ZERO | Z_NOFAIL); \
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if (entry == NULL) { \
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TRACKER_LOG(LOG_ERR, "Failed to allocate tracker IP entry"); \
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} \
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}
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#define FREE_ENTRY(entry) \
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if (entry) { \
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if (entry->metadata.flags & SO_TRACKER_ATTRIBUTE_FLAGS_DOMAIN_SHORT) { \
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zfree(tracker_hash_entry_short_zone, entry); \
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} else { \
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zfree(tracker_hash_entry_zone, entry); \
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} \
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}
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#define SIZE_OF_ENTRY(entry) \
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((entry && entry->metadata.flags & SO_TRACKER_ATTRIBUTE_FLAGS_DOMAIN_SHORT) ? \
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sizeof(struct tracker_hash_entry_short) : entry ? sizeof(struct tracker_hash_entry) : 0)
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#define GET_METADATA_BUFFERS_DST(metadata) \
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size_t dst_domain_max = 0; \
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uint8_t *dst_domain_buffer = NULL; \
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uint8_t *dst_domain_owner_buffer = NULL; \
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if (metadata != NULL) { \
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if (metadata->flags & SO_TRACKER_ATTRIBUTE_FLAGS_DOMAIN_SHORT) { \
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tracker_metadata_short_t *short_metadata = (tracker_metadata_short_t *)metadata; \
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dst_domain_max = TRACKER_DOMAIN_SHORT_MAX; \
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dst_domain_buffer = (uint8_t *)(&short_metadata->domain); \
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dst_domain_owner_buffer = (uint8_t *)(&short_metadata->domain_owner); \
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} else { \
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dst_domain_max = TRACKER_DOMAIN_MAX; \
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dst_domain_buffer = (uint8_t *)(&metadata->domain); \
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dst_domain_owner_buffer = (uint8_t *)(&metadata->domain_owner); \
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} \
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}
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#define GET_METADATA_BUFFERS_SRC(metadata) \
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size_t src_domain_max = 0; \
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uint8_t *src_domain_buffer = NULL; \
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uint8_t *src_domain_owner_buffer = NULL; \
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if (metadata != NULL) { \
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if (metadata->flags & SO_TRACKER_ATTRIBUTE_FLAGS_DOMAIN_SHORT) { \
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tracker_metadata_short_t *short_metadata = (tracker_metadata_short_t *)metadata; \
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src_domain_max = TRACKER_DOMAIN_SHORT_MAX; \
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src_domain_buffer = (uint8_t *)(&short_metadata->domain); \
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src_domain_owner_buffer = (uint8_t *)(&short_metadata->domain_owner); \
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} else { \
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src_domain_max = TRACKER_DOMAIN_MAX; \
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src_domain_buffer = (uint8_t *)(&metadata->domain); \
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src_domain_owner_buffer = (uint8_t *)(&metadata->domain_owner); \
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} \
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}
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static int
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tracker_db_init(void)
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{
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tracker_db_log_handle = os_log_create("com.apple.xnu.kern.tracker_db", "tracker_db");
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g_tracker_db.tracker_hashbase = hashinit(TRACKERHASHSIZE, M_TRACKER, &g_tracker_db.tracker_hashmask);
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if (g_tracker_db.tracker_hashbase == NULL) {
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TRACKER_LOG(LOG_ERR, "Failed to initialize");
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return ENOMEM;
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}
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g_tracker_db.tracker_count = 0;
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TRACKER_LOG(LOG_DEBUG, "Initialized: hashsize %d hashmask %lX", TRACKERHASHSIZE, g_tracker_db.tracker_hashmask);
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// Spawn thread for gargage collection
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if (kernel_thread_start(tracker_gc_thread_func, NULL,
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&g_tracker_gc_thread) != KERN_SUCCESS) {
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panic_plain("%s: Can't create Tracker GC thread", __func__);
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/* NOTREACHED */
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}
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/* this must not fail */
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VERIFY(g_tracker_gc_thread != NULL);
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return 0;
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}
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static boolean_t
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copy_metadata(tracker_metadata_t *dst_metadata, tracker_metadata_t *src_metadata)
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{
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bool is_short = false;
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if (dst_metadata == NULL || src_metadata == NULL) {
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return false;
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}
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GET_METADATA_BUFFERS_DST(dst_metadata)
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GET_METADATA_BUFFERS_SRC(src_metadata)
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if (dst_domain_max == 0 || src_domain_max == 0) {
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TRACKER_LOG(LOG_ERR, "Failed to retrieve metadata domain buffers for copy");
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return false;
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}
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size_t src_domain_len = strlen((const char *)src_domain_buffer);
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size_t src_domain_owner_len = strlen((const char *)src_domain_owner_buffer);
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if ((src_domain_len > dst_domain_max) || (src_domain_owner_len > dst_domain_max)) {
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TRACKER_LOG(LOG_ERR, "Failed to copy metadata, dst buffer size too small");
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return false;
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}
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if (src_domain_buffer[0]) {
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size_t dst_domain_len = strlen((const char *)dst_domain_buffer);
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if (dst_domain_len != src_domain_len || strncmp((const char *)dst_domain_buffer, (const char *)src_domain_buffer, src_domain_len)) {
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if (src_domain_len <= dst_domain_max) {
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bcopy(src_domain_buffer, dst_domain_buffer, src_domain_len);
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dst_domain_buffer[src_domain_len] = 0;
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}
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}
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} else {
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dst_domain_buffer[0] = 0;
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}
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if (src_domain_owner_buffer[0]) {
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size_t dst_domain_owner_len = strlen((const char *)dst_domain_owner_buffer);
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if (dst_domain_owner_len != src_domain_owner_len || strncmp((const char *)dst_domain_owner_buffer, (const char *)src_domain_owner_buffer, src_domain_owner_len)) {
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if (src_domain_owner_len <= dst_domain_max) {
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bcopy(src_domain_owner_buffer, dst_domain_owner_buffer, src_domain_owner_len);
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dst_domain_owner_buffer[src_domain_owner_len] = 0;
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}
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}
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} else {
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dst_domain_owner_buffer[0] = 0;
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}
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is_short = (dst_metadata->flags & SO_TRACKER_ATTRIBUTE_FLAGS_DOMAIN_SHORT);
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dst_metadata->flags = src_metadata->flags;
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if (is_short) {
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dst_metadata->flags |= SO_TRACKER_ATTRIBUTE_FLAGS_DOMAIN_SHORT;
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} else {
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dst_metadata->flags &= ~SO_TRACKER_ATTRIBUTE_FLAGS_DOMAIN_SHORT;
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}
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return true;
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}
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static int
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fill_hash_entry(struct tracker_hash_entry *entry, uuid_t appuuid, struct sockaddr *address)
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{
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struct sockaddr_in *sin = NULL;
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struct sockaddr_in6 *sin6 = NULL;
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if (uuid_is_null(entry->app_uuid)) {
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if (appuuid == NULL || uuid_is_null(appuuid)) {
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return EINVAL;
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}
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uuid_copy(entry->app_uuid, appuuid);
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}
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if (address == NULL) {
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TRACKER_LOG(LOG_ERR, "Missing remote address");
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return EINVAL;
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}
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entry->lastused = net_uptime();
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switch (address->sa_family) {
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case AF_INET:
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sin = satosin(address);
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if (sin->sin_len < sizeof(*sin)) {
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return EINVAL;
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}
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if (sin->sin_addr.s_addr) {
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entry->address.addr46.ia46_addr4.s_addr = sin->sin_addr.s_addr;
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}
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entry->address_family = AF_INET;
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return 0;
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case AF_INET6:
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sin6 = satosin6(address);
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if (sin6->sin6_len < sizeof(*sin6)) {
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return EINVAL;
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}
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if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
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entry->address.addr6 = sin6->sin6_addr;
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}
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entry->address_family = AF_INET6;
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return 0;
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default:
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TRACKER_LOG(LOG_ERR, "Invalid address family <%d>", address->sa_family);
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return EINVAL;
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}
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}
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static inline void
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tracker_entry_log(int log_level, char *log_msg, struct tracker_hash_entry *entry, uint32_t hash)
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{
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char addr_buffer[MAX_IPv6_STR_LEN + 6];
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const void *addr;
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if (entry == NULL) {
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return;
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}
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switch (entry->address_family) {
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case AF_INET6:
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addr = &entry->address.addr6;
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inet_ntop(AF_INET6, addr, addr_buffer, sizeof(addr_buffer));
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break;
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case AF_INET:
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addr = &entry->address.addr46.ia46_addr4.s_addr;
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inet_ntop(AF_INET, addr, addr_buffer, sizeof(addr_buffer));
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break;
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default:
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return;
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}
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GET_METADATA_BUFFERS_DST((&entry->metadata))
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uint8_t *ptr = (uint8_t *)&entry->app_uuid;
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TRACKER_LOG(log_level, "%s - %s <%s> len %d <%s> len %d <flags %X> %x%x%x%x-%x%x%x%x-%x%x%x%x-%x%x%x%x (hash 0x%X hashsize %d)", log_msg ? log_msg : "n/a",
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addr_buffer, dst_domain_buffer, (int)strlen((const char *)dst_domain_buffer), dst_domain_owner_buffer, (int)strlen((const char *)dst_domain_owner_buffer),
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entry->metadata.flags,
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ptr[0], ptr[1], ptr[2], ptr[3], ptr[4], ptr[5], ptr[6], ptr[7],
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ptr[8], ptr[9], ptr[10], ptr[11], ptr[12], ptr[13], ptr[14], ptr[15],
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hash, TRACKERHASHSIZE);
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}
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static inline struct tracker_hash_entry *
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tracker_search_and_insert(struct tracker_db *db, struct tracker_hash_entry *matchentry, boolean_t insert)
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{
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u_int32_t key0 = 0, key1 = 0, key2 = 0, key3 = 0;
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struct trackerhashhead *trackerhash = NULL;
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struct tracker_hash_entry *nextentry = NULL;
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int hash_element = 0;
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int count = 0;
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if (db == NULL || matchentry == NULL) {
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return NULL;
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}
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if (matchentry->address_family == AF_INET6) {
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key0 = matchentry->address.addr6.s6_addr32[0];
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key1 = matchentry->address.addr6.s6_addr32[1];
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key2 = matchentry->address.addr6.s6_addr32[2];
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key3 = matchentry->address.addr6.s6_addr32[3];
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} else {
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key0 = matchentry->address.addr46.ia46_addr4.s_addr;
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}
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hash_element = TRACKER_HASH(&matchentry->app_uuid, &key0, &key1, &key2, &key3) & db->tracker_hashmask;
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trackerhash = &db->tracker_hashbase[hash_element];
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LIST_FOREACH(nextentry, trackerhash, entry_link) {
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count++;
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if (uuid_compare(nextentry->app_uuid, matchentry->app_uuid) != 0) {
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continue;
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}
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if ((nextentry->address_family == AF_INET && matchentry->address_family == AF_INET &&
|
|
nextentry->address.addr46.ia46_addr4.s_addr == matchentry->address.addr46.ia46_addr4.s_addr) ||
|
|
(nextentry->address_family == AF_INET6 && matchentry->address_family == AF_INET6 &&
|
|
IN6_ARE_ADDR_EQUAL(&nextentry->address.addr6, &matchentry->address.addr6))) {
|
|
TRACKER_ENTRY_LOG(LOG_DEBUG, "Matched entry", nextentry, hash_element);
|
|
if (db->max_link_count == 0 || db->max_link_count < count) {
|
|
db->max_link_count = count;
|
|
TRACKER_LOG(LOG_DEBUG, "Max link count %d (hash 0x%X)", db->max_link_count, hash_element);
|
|
}
|
|
|
|
// If this is for insert and we found an existing entry, update the metadata if different.
|
|
// Different domain aliases may resolve to the same IP, but we only keep one entry for the same
|
|
// IP address. Therefore, we update to the last metadata.
|
|
if (insert) {
|
|
if (copy_metadata(&nextentry->metadata, &matchentry->metadata) == true) {
|
|
TRACKER_ENTRY_LOG(LOG_DEBUG, "Updated entry", nextentry, hash_element);
|
|
return nextentry;
|
|
} else {
|
|
// Failed to update found entry, delete it from db and allow insertion of new entry.
|
|
TRACKER_ENTRY_LOG(LOG_ERR, "Failed to Update entry, deleting found entry", nextentry, hash_element);
|
|
g_tracker_db.tracker_count--;
|
|
if (nextentry->metadata.flags & SO_TRACKER_ATTRIBUTE_FLAGS_DOMAIN_SHORT) {
|
|
g_tracker_db.tracker_count_short--;
|
|
}
|
|
LIST_REMOVE(nextentry, entry_link);
|
|
FREE_ENTRY(nextentry);
|
|
break;
|
|
}
|
|
} else {
|
|
return nextentry;
|
|
}
|
|
}
|
|
}
|
|
if (db->max_link_count == 0 || db->max_link_count < count) {
|
|
db->max_link_count = count;
|
|
TRACKER_LOG(LOG_DEBUG, "Max link count %d (hash 0x%X)", db->max_link_count, hash_element);
|
|
}
|
|
|
|
// Entry not found, insert it if requested.
|
|
if (insert) {
|
|
LIST_INSERT_HEAD(trackerhash, matchentry, entry_link);
|
|
|
|
// Wake gc thread if this is first flow added
|
|
if (db->tracker_count == 0) {
|
|
thread_wakeup((caddr_t)&db->tracker_count);
|
|
}
|
|
|
|
db->tracker_count++;
|
|
if (matchentry->metadata.flags & SO_TRACKER_ATTRIBUTE_FLAGS_DOMAIN_SHORT) {
|
|
g_tracker_db.tracker_count_short++;
|
|
}
|
|
TRACKER_ENTRY_LOG(LOG_DEBUG, "Added entry", matchentry, hash_element);
|
|
TRACKER_LOG(LOG_DEBUG, "Total entries %d (hashmask 0x%lX)", db->tracker_count, db->tracker_hashmask);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int
|
|
tracker_retrieve_attribute(u_int8_t *buffer, size_t buffer_length, u_int8_t type, u_int8_t *out_buffer, size_t out_size, size_t out_max_size)
|
|
{
|
|
int cursor = 0;
|
|
size_t value_size = 0;
|
|
u_int8_t *value = NULL;
|
|
|
|
cursor = necp_buffer_find_tlv(buffer, (u_int32_t)buffer_length, 0, type, NULL, 0);
|
|
if (cursor < 0) {
|
|
TRACKER_LOG(LOG_DEBUG, "No tracker attribute of type %d found in parameters", type);
|
|
return ENOENT;
|
|
}
|
|
|
|
value_size = necp_buffer_get_tlv_length(buffer, cursor);
|
|
if (out_size && value_size != out_size) {
|
|
TRACKER_LOG(LOG_ERR, "Wrong size for tracker attribute type %d size %zu <got size %zu>", type, out_size, value_size);
|
|
return EINVAL;
|
|
}
|
|
if (value_size > out_max_size) {
|
|
TRACKER_LOG(LOG_ERR, "Exceeded max size (%zu) - tracker attribute type %d size %zu", out_max_size, type, value_size);
|
|
return EINVAL;
|
|
}
|
|
|
|
value = necp_buffer_get_tlv_value(buffer, cursor, NULL);
|
|
if (value == NULL) {
|
|
TRACKER_LOG(LOG_ERR, "Failed to get value for tracker attribute type %d size %zu", type, value_size);
|
|
return EINVAL;
|
|
}
|
|
|
|
memcpy(out_buffer, value, value_size);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
tracker_add(struct proc *p, struct tracker_action_args *uap, int *retval)
|
|
{
|
|
uint8_t scratch_pad[TRACKER_SCRATCH_PAD_SIZE] = { };
|
|
struct sockaddr_in6 addrBuffer = { };
|
|
struct sockopt sopt = { };
|
|
struct tracker_hash_entry *entry = NULL;
|
|
struct tracker_db *db = NULL;
|
|
sa_family_t address_family = 0;
|
|
u_int address_size = 0;
|
|
u_int8_t *buffer = scratch_pad;
|
|
size_t buffer_size = 0;
|
|
int error = 0;
|
|
uint32_t flags = 0;
|
|
|
|
// Make sure parameter blob is valid
|
|
if (uap->buffer == 0 || uap->buffer_size == 0) {
|
|
*retval = EINVAL;
|
|
return EINVAL;
|
|
}
|
|
|
|
// If scratchpad not large enough, allocate memory
|
|
buffer_size = uap->buffer_size;
|
|
if (buffer_size > sizeof(scratch_pad)) {
|
|
if (buffer_size > TRACKER_BUFFER_ALLOC_MAX) {
|
|
TRACKER_LOG(LOG_ERR, "Failed to allocate buffer, size exceeded max allowed");
|
|
*retval = ENOMEM;
|
|
return ENOMEM;
|
|
}
|
|
buffer = (u_int8_t *)kalloc_data(buffer_size, Z_WAITOK | Z_ZERO);
|
|
if (buffer == NULL) {
|
|
*retval = ENOMEM;
|
|
return ENOMEM;
|
|
}
|
|
}
|
|
sopt.sopt_val = uap->buffer;
|
|
sopt.sopt_valsize = uap->buffer_size;
|
|
sopt.sopt_p = p;
|
|
error = sooptcopyin(&sopt, buffer, buffer_size, 0);
|
|
if (error) {
|
|
TRACKER_LOG(LOG_ERR, "Failed to copy parameters");
|
|
goto cleanup;
|
|
}
|
|
|
|
// Address Family (Required)
|
|
error = tracker_retrieve_attribute(buffer, buffer_size, SO_TRACKER_ATTRIBUTE_ADDRESS_FAMILY, (u_int8_t *)&address_family, sizeof(address_family), sizeof(address_family));
|
|
if (error) {
|
|
TRACKER_LOG(LOG_ERR, "Could not retrieve address family TLV from parameters");
|
|
goto cleanup;
|
|
}
|
|
if (address_family != AF_INET6 && address_family != AF_INET) {
|
|
error = EINVAL;
|
|
goto cleanup;
|
|
}
|
|
address_size = (address_family == AF_INET) ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6);
|
|
|
|
// Address (Required)
|
|
error = tracker_retrieve_attribute(buffer, buffer_size, SO_TRACKER_ATTRIBUTE_ADDRESS, (u_int8_t *)&addrBuffer, address_size, address_size);
|
|
if (error) {
|
|
TRACKER_LOG(LOG_ERR, "Could not retrieve address TLV from parameters");
|
|
goto cleanup;
|
|
}
|
|
if (address_family != addrBuffer.sin6_family) {
|
|
TRACKER_LOG(LOG_ERR, "Address family parameter and address parameter family mismatch <%d != %d>",
|
|
address_family, addrBuffer.sin6_family);
|
|
error = EINVAL;
|
|
goto cleanup;
|
|
}
|
|
|
|
// Flags (Optional), so if not present, ignore and proceed.
|
|
error = tracker_retrieve_attribute(buffer, buffer_size, SO_TRACKER_ATTRIBUTE_FLAGS, (u_int8_t *)&flags, sizeof(flags), sizeof(flags));
|
|
if (error == EINVAL) {
|
|
TRACKER_LOG(LOG_INFO, "Could not retrieve flags TLV from parameters");
|
|
goto cleanup;
|
|
}
|
|
|
|
ALLOC_ENTRY(flags, entry)
|
|
if (entry == NULL) {
|
|
error = ENOMEM;
|
|
goto cleanup;
|
|
}
|
|
entry->metadata.flags = flags;
|
|
GET_METADATA_BUFFERS_DST((&entry->metadata))
|
|
|
|
// APP UUID (Required)
|
|
error = tracker_retrieve_attribute(buffer, buffer_size, SO_TRACKER_ATTRIBUTE_APP_UUID, (u_int8_t *)&entry->app_uuid, sizeof(uuid_t), sizeof(uuid_t));
|
|
if (error) {
|
|
TRACKER_LOG(LOG_ERR, "Could not retrieve APP UUID TLV from parameters");
|
|
error = EINVAL;
|
|
goto cleanup;
|
|
}
|
|
|
|
// Domain (Required)
|
|
error = tracker_retrieve_attribute(buffer, buffer_size, SO_TRACKER_ATTRIBUTE_DOMAIN, dst_domain_buffer, 0, dst_domain_max);
|
|
if (error) {
|
|
TRACKER_LOG(LOG_ERR, "Could not retrieve domain TLV from parameters");
|
|
error = EINVAL;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (entry->metadata.flags & SO_TRACKER_ATTRIBUTE_FLAGS_TRACKER) {
|
|
// Domain Owner (Required only for tracker flow)
|
|
error = tracker_retrieve_attribute(buffer, buffer_size, SO_TRACKER_ATTRIBUTE_DOMAIN_OWNER, dst_domain_owner_buffer, 0, dst_domain_max);
|
|
if (error) {
|
|
TRACKER_LOG(LOG_ERR, "Could not retrieve domain owner TLV from parameters");
|
|
error = EINVAL;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
if (fill_hash_entry(entry, NULL, (struct sockaddr *)&addrBuffer) != 0) {
|
|
error = EINVAL;
|
|
goto cleanup;
|
|
}
|
|
|
|
// If reach here, all required parameter are parsed, clear error.
|
|
error = 0;
|
|
|
|
TRACKER_LOCK_EXCLUSIVE
|
|
|
|
if (g_tracker_db.tracker_hashbase == NULL) {
|
|
if (tracker_db_init() != 0) {
|
|
error = ENOENT;
|
|
goto done;
|
|
}
|
|
}
|
|
db = &g_tracker_db;
|
|
|
|
// Insert if not already in hash.
|
|
if (tracker_search_and_insert(db, entry, true) != NULL) {
|
|
// A match is found, so new entry is not inserted. Free it.
|
|
FREE_ENTRY(entry);
|
|
}
|
|
entry = NULL;
|
|
|
|
done:
|
|
TRACKER_UNLOCK_EXCLUSIVE
|
|
|
|
cleanup:
|
|
if (buffer != scratch_pad) {
|
|
kfree_data(buffer, buffer_size);
|
|
}
|
|
if (error && entry) {
|
|
FREE_ENTRY(entry);
|
|
}
|
|
|
|
*retval = error;
|
|
return error;
|
|
}
|
|
|
|
static size_t
|
|
tracker_entry_dump_size(struct tracker_hash_entry *entry)
|
|
{
|
|
size_t len = 0;
|
|
size_t str_len = 0;
|
|
|
|
if (entry == NULL) {
|
|
return 0;
|
|
}
|
|
|
|
len += TRACKER_TLV_HDR_LEN + sizeof(entry->address_family);
|
|
|
|
switch (entry->address_family) {
|
|
case AF_INET:
|
|
len += TRACKER_TLV_HDR_LEN + sizeof(entry->address.addr46.ia46_addr4.s_addr);
|
|
break;
|
|
case AF_INET6:
|
|
len += TRACKER_TLV_HDR_LEN + sizeof(entry->address.addr6);
|
|
break;
|
|
default:
|
|
TRACKER_LOG(LOG_ERR, "Could not calculate entry dump size - invalid addr family %d",
|
|
entry->address_family);
|
|
return 0;
|
|
}
|
|
|
|
len += TRACKER_TLV_HDR_LEN + sizeof(entry->app_uuid);
|
|
|
|
GET_METADATA_BUFFERS_DST((&entry->metadata))
|
|
if (dst_domain_max == 0) {
|
|
TRACKER_LOG(LOG_ERR, "Could not calculate entry dump size - 0 dst_domain_max");
|
|
return 0;
|
|
}
|
|
|
|
str_len = strlen((const char *)dst_domain_buffer);
|
|
if (str_len) {
|
|
len += TRACKER_TLV_HDR_LEN + str_len + 1;
|
|
}
|
|
|
|
str_len = strlen((const char *)dst_domain_owner_buffer);
|
|
if (str_len) {
|
|
len += TRACKER_TLV_HDR_LEN + str_len + 1;
|
|
}
|
|
|
|
if (entry->metadata.flags) {
|
|
len += TRACKER_TLV_HDR_LEN + sizeof(entry->metadata.flags);
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
static size_t
|
|
tracker_entry_dump(struct tracker_hash_entry *entry, uint8_t *buffer, size_t buffer_size)
|
|
{
|
|
u_int8_t *cursor = buffer;
|
|
size_t str_len = 0;
|
|
|
|
if (entry == NULL) {
|
|
return 0;
|
|
}
|
|
cursor = necp_buffer_write_tlv(cursor, SO_TRACKER_ATTRIBUTE_APP_UUID, (u_int32_t)sizeof(entry->app_uuid), &entry->app_uuid, buffer, (u_int32_t)buffer_size);
|
|
cursor = necp_buffer_write_tlv(cursor, SO_TRACKER_ATTRIBUTE_ADDRESS_FAMILY, (u_int32_t)sizeof(entry->address_family), &entry->address_family, buffer, (u_int32_t)buffer_size);
|
|
|
|
switch (entry->address_family) {
|
|
case AF_INET:
|
|
cursor = necp_buffer_write_tlv(cursor, SO_TRACKER_ATTRIBUTE_ADDRESS,
|
|
(u_int32_t)sizeof(entry->address.addr46.ia46_addr4.s_addr), &entry->address.addr46.ia46_addr4.s_addr, buffer, (u_int32_t)buffer_size);
|
|
break;
|
|
case AF_INET6:
|
|
cursor = necp_buffer_write_tlv(cursor, SO_TRACKER_ATTRIBUTE_ADDRESS, (u_int32_t)sizeof(entry->address.addr6), &entry->address.addr6, buffer, (u_int32_t)buffer_size);
|
|
break;
|
|
default:
|
|
TRACKER_LOG(LOG_ERR, "Could not dump entry - invalid addr family %d",
|
|
entry->address_family);
|
|
return 0;
|
|
}
|
|
|
|
if (entry->metadata.flags) {
|
|
cursor = necp_buffer_write_tlv(cursor, SO_TRACKER_ATTRIBUTE_FLAGS, (u_int32_t)sizeof(entry->metadata.flags), &entry->metadata.flags, buffer, (u_int32_t)buffer_size);
|
|
}
|
|
|
|
GET_METADATA_BUFFERS_DST((&entry->metadata))
|
|
if (dst_domain_max == 0) {
|
|
TRACKER_LOG(LOG_ERR, "Could not dump entry - 0 dst_domain_max");
|
|
return 0;
|
|
}
|
|
|
|
str_len = strlen((const char *)dst_domain_buffer);
|
|
TRACKER_LOG(LOG_DEBUG, "Dumping domain <%s> len <%zu>", dst_domain_buffer, str_len);
|
|
if (str_len) {
|
|
str_len++;
|
|
cursor = necp_buffer_write_tlv(cursor, SO_TRACKER_ATTRIBUTE_DOMAIN, (u_int32_t)str_len, dst_domain_buffer, buffer, (u_int32_t)buffer_size);
|
|
}
|
|
|
|
str_len = strlen((const char *)dst_domain_owner_buffer);
|
|
TRACKER_LOG(LOG_DEBUG, "Dumping domain owner <%s> len <%zu>", dst_domain_owner_buffer, str_len);
|
|
if (str_len) {
|
|
str_len++;
|
|
cursor = necp_buffer_write_tlv(cursor, SO_TRACKER_ATTRIBUTE_DOMAIN_OWNER, (u_int32_t)str_len, dst_domain_owner_buffer, buffer, (u_int32_t)buffer_size);
|
|
}
|
|
|
|
return cursor - buffer;
|
|
}
|
|
|
|
static int
|
|
tracker_dump(struct proc *p, struct tracker_action_args *uap, int *retval, bool by_app)
|
|
{
|
|
#pragma unused(p)
|
|
uint8_t app_uuid_tlv[TRACKER_TLV_HDR_LEN + sizeof(uuid_t)] = { };
|
|
struct sockopt sopt = { };
|
|
struct tracker_hash_entry *entry = NULL;
|
|
struct tracker_hash_entry *temp_entry = NULL;
|
|
struct trackerhashhead *hash = NULL;
|
|
uint8_t *buffer = scratch_pad_all;
|
|
size_t buffer_size = sizeof(scratch_pad_all);
|
|
uint8_t *data_start = NULL;
|
|
uint8_t *cursor = NULL;
|
|
size_t entry_tlv_size = 0;
|
|
size_t total_mem_size = 0;
|
|
size_t total_size_needed = 0;
|
|
size_t total_size = 0;
|
|
int error = 0;
|
|
uuid_t app_uuid;
|
|
bool has_app_uuid = false;
|
|
|
|
if (uap->buffer == 0 || uap->buffer_size == 0) {
|
|
TRACKER_LOG(LOG_ERR, "Could not dump entries, null output buffer");
|
|
*retval = EINVAL;
|
|
return EINVAL;
|
|
}
|
|
|
|
if (by_app) {
|
|
// Expect a UUID TLV
|
|
if (uap->buffer_size < sizeof(app_uuid_tlv)) {
|
|
return EINVAL;
|
|
}
|
|
sopt.sopt_val = uap->buffer;
|
|
sopt.sopt_valsize = sizeof(app_uuid_tlv);
|
|
sopt.sopt_p = p;
|
|
if (sooptcopyin(&sopt, app_uuid_tlv, sizeof(app_uuid_tlv), sizeof(app_uuid_tlv)) == 0) {
|
|
if (tracker_retrieve_attribute(app_uuid_tlv, sizeof(app_uuid_tlv), SO_TRACKER_ATTRIBUTE_APP_UUID, (u_int8_t *)&app_uuid, sizeof(app_uuid), sizeof(app_uuid)) == 0) {
|
|
has_app_uuid = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
TRACKER_LOCK_EXCLUSIVE
|
|
|
|
if (g_tracker_db.tracker_hashbase == NULL || g_tracker_db.tracker_count == 0) {
|
|
error = ENOENT;
|
|
goto done;
|
|
}
|
|
|
|
for (int i = 0; i < TRACKERHASHSIZE; i++) {
|
|
hash = &g_tracker_db.tracker_hashbase[i];
|
|
|
|
LIST_FOREACH_SAFE(entry, hash, entry_link, temp_entry) {
|
|
if (has_app_uuid && uuid_compare(entry->app_uuid, app_uuid) != 0) {
|
|
continue;
|
|
}
|
|
|
|
entry_tlv_size = tracker_entry_dump_size(entry);
|
|
if (entry_tlv_size) {
|
|
entry_tlv_size += TRACKER_TLV_HDR_LEN;
|
|
if (os_add_overflow(total_size_needed, entry_tlv_size, &total_size_needed)) {
|
|
TRACKER_LOG(LOG_ERR, "Could not dump entries, failed to calculate total size needed");
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Add space for memory usage TLV
|
|
if (os_add_overflow(total_size_needed, TRACKER_TLV_HDR_LEN + sizeof(total_mem_size), &total_size_needed)) {
|
|
TRACKER_LOG(LOG_ERR, "Could not dump entries, failed to calculate total size needed for memory used)");
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
// pre-append 4-bytes size to start of buffer.
|
|
if (os_add_overflow(total_size_needed, sizeof(uint32_t), &total_size_needed)) {
|
|
TRACKER_LOG(LOG_ERR, "Could not dump entries, failed to add 4-bytes size to start of buffer");
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
if (total_size_needed > uap->buffer_size) {
|
|
TRACKER_LOG(LOG_ERR, "Could not dump entries, output buffer too small %lu (needed %lu)",
|
|
(unsigned long)uap->buffer_size, total_size_needed + sizeof(uint32_t));
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
// total tlv length + 4-bytes total size.
|
|
if (total_size_needed > sizeof(scratch_pad_all)) {
|
|
if (total_size_needed > TRACKER_BUFFER_ALLOC_MAX) {
|
|
TRACKER_LOG(LOG_ERR, "Failed to allocate buffer, size exceeded max allowed");
|
|
error = ENOMEM;
|
|
goto done;
|
|
}
|
|
buffer = (u_int8_t *)kalloc_data(total_size_needed, Z_ZERO);
|
|
if (buffer == NULL) {
|
|
TRACKER_LOG(LOG_ERR, "Could not dump entries, failed to allocate buffer");
|
|
error = ENOMEM;
|
|
goto done;
|
|
}
|
|
buffer_size = total_size_needed;
|
|
}
|
|
|
|
data_start = buffer + sizeof(uint32_t);
|
|
cursor = data_start;
|
|
for (int i = 0; i < TRACKERHASHSIZE; i++) {
|
|
hash = &g_tracker_db.tracker_hashbase[i];
|
|
|
|
LIST_FOREACH_SAFE(entry, hash, entry_link, temp_entry) {
|
|
if (has_app_uuid && uuid_compare(entry->app_uuid, app_uuid) != 0) {
|
|
continue;
|
|
}
|
|
|
|
entry_tlv_size = tracker_entry_dump(entry, scratch_pad_entry, sizeof(scratch_pad_entry));
|
|
if (entry_tlv_size <= 0) {
|
|
TRACKER_LOG(LOG_ERR, "Could not dump entry, exceeded entry tlv buffer size");
|
|
continue;
|
|
} else {
|
|
TRACKER_ENTRY_LOG(LOG_DEBUG, "Dumped entry", entry, 0);
|
|
}
|
|
cursor = necp_buffer_write_tlv(cursor, SO_TRACKER_ATTRIBUTE_DUMP_ENTRY, (u_int32_t)entry_tlv_size, scratch_pad_entry, data_start, (u_int32_t)(buffer_size - sizeof(uint32_t)));
|
|
|
|
if (os_add_overflow(total_mem_size, SIZE_OF_ENTRY(entry), &total_mem_size)) {
|
|
TRACKER_LOG(LOG_ERR, "Could not dump entries, failed to calculate total memory used");
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
TRACKER_LOG(LOG_DEBUG, "Total memory size %zu", total_mem_size);
|
|
}
|
|
}
|
|
|
|
cursor = necp_buffer_write_tlv(cursor, SO_TRACKER_ATTRIBUTE_MEMORY_USED, sizeof(total_mem_size), &total_mem_size, data_start, (u_int32_t)(buffer_size - sizeof(uint32_t)));
|
|
|
|
// Fill in the total length at the start
|
|
total_size = cursor - data_start;
|
|
memcpy(buffer, (uint8_t *)&total_size, sizeof(uint32_t));
|
|
|
|
error = copyout(buffer, uap->buffer, total_size + sizeof(u_int32_t));
|
|
if (error) {
|
|
TRACKER_LOG(LOG_DEBUG, "Failed to copy out dump buffer (%lu bytes)", total_size + sizeof(u_int32_t));
|
|
}
|
|
|
|
done:
|
|
TRACKER_UNLOCK_EXCLUSIVE
|
|
|
|
if (buffer != scratch_pad_all) {
|
|
kfree_data(buffer, buffer_size);
|
|
}
|
|
*retval = error;
|
|
return error;
|
|
}
|
|
|
|
int
|
|
tracker_action(struct proc *p, struct tracker_action_args *uap, int *retval)
|
|
{
|
|
const task_t task = proc_task(p);
|
|
if (task == NULL || !IOTaskHasEntitlement(task, "com.apple.private.ip-domain-table")) {
|
|
TRACKER_LOG(LOG_ERR, "Process (%d) does not hold the necessary entitlement", proc_pid(p));
|
|
*retval = EPERM;
|
|
return EPERM;
|
|
}
|
|
|
|
switch (uap->action) {
|
|
case SO_TRACKER_ACTION_ADD:
|
|
return tracker_add(p, uap, retval);
|
|
case SO_TRACKER_ACTION_DUMP_BY_APP:
|
|
return tracker_dump(p, uap, retval, true);
|
|
case SO_TRACKER_ACTION_DUMP_ALL:
|
|
return tracker_dump(p, uap, retval, false);
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
tracker_lookup(uuid_t app_uuid, struct sockaddr *remote, tracker_metadata_t *metadata)
|
|
{
|
|
struct tracker_hash_entry matchentry = { };
|
|
struct tracker_hash_entry *foundentry = NULL;
|
|
struct tracker_db *db = NULL;
|
|
int error = 0;
|
|
|
|
if (remote == NULL || uuid_is_null(app_uuid)) {
|
|
TRACKER_LOG(LOG_DEBUG, "Failed lookup - remote %s null, app_uuid %s null",
|
|
remote ? "is not" : "is", !uuid_is_null(app_uuid) ? "is not" : "is");
|
|
return EINVAL;
|
|
}
|
|
|
|
TRACKER_LOCK_SHARED
|
|
|
|
if (g_tracker_db.tracker_hashbase == NULL || g_tracker_db.tracker_count == 0) {
|
|
error = ENOENT;
|
|
goto done;
|
|
}
|
|
db = &g_tracker_db;
|
|
|
|
if (fill_hash_entry(&matchentry, app_uuid, remote) != 0) {
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
TRACKER_ENTRY_LOG(LOG_DEBUG, "Lookup entry", &matchentry, 0);
|
|
|
|
foundentry = tracker_search_and_insert(db, &matchentry, false);
|
|
if (foundentry) {
|
|
if (metadata) {
|
|
if (copy_metadata(metadata, &foundentry->metadata) == false) {
|
|
TRACKER_ENTRY_LOG(LOG_ERR, "Failed to copy metadata", &matchentry, 0);
|
|
error = ENOENT;
|
|
}
|
|
}
|
|
foundentry->lastused = net_uptime();
|
|
}
|
|
|
|
done:
|
|
TRACKER_UNLOCK_SHARED
|
|
return error;
|
|
}
|
|
|
|
static void
|
|
tracker_gc_thread_sleep(bool forever)
|
|
{
|
|
if (forever) {
|
|
(void) assert_wait((event_t) &g_tracker_db.tracker_count,
|
|
THREAD_INTERRUPTIBLE);
|
|
} else {
|
|
uint64_t deadline = 0;
|
|
nanoseconds_to_absolutetime(TRACKER_GC_RUN_INTERVAL_NSEC, &deadline);
|
|
clock_absolutetime_interval_to_deadline(deadline, &deadline);
|
|
|
|
(void) assert_wait_deadline(&g_tracker_db.tracker_count,
|
|
THREAD_INTERRUPTIBLE, deadline);
|
|
}
|
|
}
|
|
|
|
static void
|
|
tracker_gc_thread_func(void *v, wait_result_t w)
|
|
{
|
|
#pragma unused(v, w)
|
|
|
|
ASSERT(g_tracker_gc_thread == current_thread());
|
|
thread_set_thread_name(current_thread(), "TRACKER_GC");
|
|
|
|
// Kick off gc shortly
|
|
tracker_gc_thread_sleep(false);
|
|
thread_block_parameter((thread_continue_t) tracker_entry_expire, NULL);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static bool
|
|
tracker_idle_timed_out(struct tracker_hash_entry *entry, u_int64_t timeout, u_int64_t current_time)
|
|
{
|
|
if (entry && (current_time - entry->lastused >= timeout)) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static void
|
|
tracker_entry_expire(void *v, wait_result_t w)
|
|
{
|
|
#pragma unused (v, w)
|
|
struct tracker_hash_entry *entry = NULL;
|
|
struct tracker_hash_entry *temp_entry = NULL;
|
|
struct trackerhashhead *hash = NULL;
|
|
|
|
u_int64_t current_time = net_uptime();
|
|
int deleted_count = 0;
|
|
int remaining_count = 0;
|
|
|
|
for (int i = 0; i < TRACKERHASHSIZE; i++) {
|
|
TRACKER_LOCK_EXCLUSIVE
|
|
|
|
if (g_tracker_db.tracker_hashbase == NULL || g_tracker_db.tracker_count == 0) {
|
|
TRACKER_UNLOCK_EXCLUSIVE
|
|
goto go_sleep;
|
|
}
|
|
hash = &g_tracker_db.tracker_hashbase[i];
|
|
|
|
LIST_FOREACH_SAFE(entry, hash, entry_link, temp_entry) {
|
|
if (tracker_idle_timed_out(entry, tracker_db_idle_timeout, current_time)) {
|
|
TRACKER_ENTRY_LOG(LOG_DEBUG, "Deleting entry - IDLE TO", entry, i);
|
|
g_tracker_db.tracker_count--;
|
|
if (entry->metadata.flags & SO_TRACKER_ATTRIBUTE_FLAGS_DOMAIN_SHORT) {
|
|
g_tracker_db.tracker_count_short--;
|
|
}
|
|
LIST_REMOVE(entry, entry_link);
|
|
FREE_ENTRY(entry);
|
|
deleted_count++;
|
|
}
|
|
}
|
|
|
|
remaining_count = g_tracker_db.tracker_count;
|
|
TRACKER_UNLOCK_EXCLUSIVE
|
|
}
|
|
|
|
go_sleep:
|
|
|
|
TRACKER_LOG(LOG_DEBUG, "Garbage Collection done...(deleted %d - total count %d)", deleted_count, remaining_count);
|
|
|
|
// Sleep forever (until waken up) if no more UDP flow to clean
|
|
TRACKER_LOCK_SHARED
|
|
tracker_gc_thread_sleep(g_tracker_db.tracker_count == 0 ? true : false);
|
|
TRACKER_UNLOCK_SHARED
|
|
thread_block_parameter((thread_continue_t)tracker_entry_expire, NULL);
|
|
/* NOTREACHED */
|
|
}
|