1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2016-2018 Netflix, Inc. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD$"); 31 32#include <sys/param.h> 33#include <sys/arb.h> 34#include <sys/kernel.h> 35#include <sys/lock.h> 36#include <sys/malloc.h> 37#include <sys/mutex.h> 38#include <sys/qmath.h> 39#include <sys/queue.h> 40#include <sys/refcount.h> 41#include <sys/rwlock.h> 42#include <sys/socket.h> 43#include <sys/socketvar.h> 44#include <sys/sysctl.h> 45#include <sys/tree.h> 46#include <sys/stats.h> /* Must come after qmath.h and tree.h */ 47#include <sys/counter.h> 48 49#include <dev/tcp_log/tcp_log_dev.h> 50 51#include <net/if.h> 52#include <net/if_var.h> 53#include <net/vnet.h> 54 55#include <netinet/in.h> 56#include <netinet/in_pcb.h> 57#include <netinet/in_var.h> 58#include <netinet/tcp_var.h> 59#include <netinet/tcp_log_buf.h> 60 61/* Default expiry time */ 62#define TCP_LOG_EXPIRE_TIME ((sbintime_t)60 * SBT_1S) 63 64/* Max interval at which to run the expiry timer */ 65#define TCP_LOG_EXPIRE_INTVL ((sbintime_t)5 * SBT_1S) 66 67bool tcp_log_verbose; 68static uma_zone_t tcp_log_bucket_zone, tcp_log_node_zone, tcp_log_zone; 69static int tcp_log_session_limit = TCP_LOG_BUF_DEFAULT_SESSION_LIMIT; 70static uint32_t tcp_log_version = TCP_LOG_BUF_VER; 71RB_HEAD(tcp_log_id_tree, tcp_log_id_bucket); 72static struct tcp_log_id_tree tcp_log_id_head; 73static STAILQ_HEAD(, tcp_log_id_node) tcp_log_expireq_head = 74 STAILQ_HEAD_INITIALIZER(tcp_log_expireq_head); 75static struct mtx tcp_log_expireq_mtx; 76static struct callout tcp_log_expireq_callout; 77static u_long tcp_log_auto_ratio = 0; 78static volatile u_long tcp_log_auto_ratio_cur = 0; 79static uint32_t tcp_log_auto_mode = TCP_LOG_STATE_TAIL; 80static bool tcp_log_auto_all = false; 81static uint32_t tcp_disable_all_bb_logs = 0; 82 83RB_PROTOTYPE_STATIC(tcp_log_id_tree, tcp_log_id_bucket, tlb_rb, tcp_log_id_cmp) 84 85SYSCTL_NODE(_net_inet_tcp, OID_AUTO, bb, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 86 "TCP Black Box controls"); 87 88SYSCTL_BOOL(_net_inet_tcp_bb, OID_AUTO, log_verbose, CTLFLAG_RW, &tcp_log_verbose, 89 0, "Force verbose logging for TCP traces"); 90 91SYSCTL_INT(_net_inet_tcp_bb, OID_AUTO, log_session_limit, 92 CTLFLAG_RW, &tcp_log_session_limit, 0, 93 "Maximum number of events maintained for each TCP session"); 94 95SYSCTL_UMA_MAX(_net_inet_tcp_bb, OID_AUTO, log_global_limit, CTLFLAG_RW, 96 &tcp_log_zone, "Maximum number of events maintained for all TCP sessions"); 97 98SYSCTL_UMA_CUR(_net_inet_tcp_bb, OID_AUTO, log_global_entries, CTLFLAG_RD, 99 &tcp_log_zone, "Current number of events maintained for all TCP sessions"); 100 101SYSCTL_UMA_MAX(_net_inet_tcp_bb, OID_AUTO, log_id_limit, CTLFLAG_RW, 102 &tcp_log_bucket_zone, "Maximum number of log IDs"); 103 104SYSCTL_UMA_CUR(_net_inet_tcp_bb, OID_AUTO, log_id_entries, CTLFLAG_RD, 105 &tcp_log_bucket_zone, "Current number of log IDs"); 106 107SYSCTL_UMA_MAX(_net_inet_tcp_bb, OID_AUTO, log_id_tcpcb_limit, CTLFLAG_RW, 108 &tcp_log_node_zone, "Maximum number of tcpcbs with log IDs"); 109 110SYSCTL_UMA_CUR(_net_inet_tcp_bb, OID_AUTO, log_id_tcpcb_entries, CTLFLAG_RD, 111 &tcp_log_node_zone, "Current number of tcpcbs with log IDs"); 112 113SYSCTL_U32(_net_inet_tcp_bb, OID_AUTO, log_version, CTLFLAG_RD, &tcp_log_version, 114 0, "Version of log formats exported"); 115 116SYSCTL_U32(_net_inet_tcp_bb, OID_AUTO, disable_all, CTLFLAG_RW, 117 &tcp_disable_all_bb_logs, TCP_LOG_STATE_HEAD_AUTO, 118 "Disable all BB logging for all connections"); 119 120SYSCTL_ULONG(_net_inet_tcp_bb, OID_AUTO, log_auto_ratio, CTLFLAG_RW, 121 &tcp_log_auto_ratio, 0, "Do auto capturing for 1 out of N sessions"); 122 123SYSCTL_U32(_net_inet_tcp_bb, OID_AUTO, log_auto_mode, CTLFLAG_RW, 124 &tcp_log_auto_mode, TCP_LOG_STATE_HEAD_AUTO, 125 "Logging mode for auto-selected sessions (default is TCP_LOG_STATE_HEAD_AUTO)"); 126 127SYSCTL_BOOL(_net_inet_tcp_bb, OID_AUTO, log_auto_all, CTLFLAG_RW, 128 &tcp_log_auto_all, false, 129 "Auto-select from all sessions (rather than just those with IDs)"); 130 131#ifdef TCPLOG_DEBUG_COUNTERS 132counter_u64_t tcp_log_queued; 133counter_u64_t tcp_log_que_fail1; 134counter_u64_t tcp_log_que_fail2; 135counter_u64_t tcp_log_que_fail3; 136counter_u64_t tcp_log_que_fail4; 137counter_u64_t tcp_log_que_fail5; 138counter_u64_t tcp_log_que_copyout; 139counter_u64_t tcp_log_que_read; 140counter_u64_t tcp_log_que_freed; 141 142SYSCTL_COUNTER_U64(_net_inet_tcp_bb, OID_AUTO, queued, CTLFLAG_RD, 143 &tcp_log_queued, "Number of entries queued"); 144SYSCTL_COUNTER_U64(_net_inet_tcp_bb, OID_AUTO, fail1, CTLFLAG_RD, 145 &tcp_log_que_fail1, "Number of entries queued but fail 1"); 146SYSCTL_COUNTER_U64(_net_inet_tcp_bb, OID_AUTO, fail2, CTLFLAG_RD, 147 &tcp_log_que_fail2, "Number of entries queued but fail 2"); 148SYSCTL_COUNTER_U64(_net_inet_tcp_bb, OID_AUTO, fail3, CTLFLAG_RD, 149 &tcp_log_que_fail3, "Number of entries queued but fail 3"); 150SYSCTL_COUNTER_U64(_net_inet_tcp_bb, OID_AUTO, fail4, CTLFLAG_RD, 151 &tcp_log_que_fail4, "Number of entries queued but fail 4"); 152SYSCTL_COUNTER_U64(_net_inet_tcp_bb, OID_AUTO, fail5, CTLFLAG_RD, 153 &tcp_log_que_fail5, "Number of entries queued but fail 4"); 154SYSCTL_COUNTER_U64(_net_inet_tcp_bb, OID_AUTO, copyout, CTLFLAG_RD, 155 &tcp_log_que_copyout, "Number of entries copied out"); 156SYSCTL_COUNTER_U64(_net_inet_tcp_bb, OID_AUTO, read, CTLFLAG_RD, 157 &tcp_log_que_read, "Number of entries read from the queue"); 158SYSCTL_COUNTER_U64(_net_inet_tcp_bb, OID_AUTO, freed, CTLFLAG_RD, 159 &tcp_log_que_freed, "Number of entries freed after reading"); 160#endif 161 162#ifdef INVARIANTS 163#define TCPLOG_DEBUG_RINGBUF 164#endif 165/* Number of requests to consider a PBCID "active". */ 166#define ACTIVE_REQUEST_COUNT 10 167 168/* Statistic tracking for "active" PBCIDs. */ 169static counter_u64_t tcp_log_pcb_ids_cur; 170static counter_u64_t tcp_log_pcb_ids_tot; 171 172SYSCTL_COUNTER_U64(_net_inet_tcp_bb, OID_AUTO, pcb_ids_cur, CTLFLAG_RD, 173 &tcp_log_pcb_ids_cur, "Number of pcb IDs allocated in the system"); 174SYSCTL_COUNTER_U64(_net_inet_tcp_bb, OID_AUTO, pcb_ids_tot, CTLFLAG_RD, 175 &tcp_log_pcb_ids_tot, "Total number of pcb IDs that have been allocated"); 176 177struct tcp_log_mem 178{ 179 STAILQ_ENTRY(tcp_log_mem) tlm_queue; 180 struct tcp_log_buffer tlm_buf; 181 struct tcp_log_verbose tlm_v; 182#ifdef TCPLOG_DEBUG_RINGBUF 183 volatile int tlm_refcnt; 184#endif 185}; 186 187/* 60 bytes for the header, + 16 bytes for padding */ 188static uint8_t zerobuf[76]; 189 190/* 191 * Lock order: 192 * 1. TCPID_TREE 193 * 2. TCPID_BUCKET 194 * 3. INP 195 * 196 * Rules: 197 * A. You need a lock on the Tree to add/remove buckets. 198 * B. You need a lock on the bucket to add/remove nodes from the bucket. 199 * C. To change information in a node, you need the INP lock if the tln_closed 200 * field is false. Otherwise, you need the bucket lock. (Note that the 201 * tln_closed field can change at any point, so you need to recheck the 202 * entry after acquiring the INP lock.) 203 * D. To remove a node from the bucket, you must have that entry locked, 204 * according to the criteria of Rule C. Also, the node must not be on 205 * the expiry queue. 206 * E. The exception to C is the expiry queue fields, which are locked by 207 * the TCPLOG_EXPIREQ lock. 208 * 209 * Buckets have a reference count. Each node is a reference. Further, 210 * other callers may add reference counts to keep a bucket from disappearing. 211 * You can add a reference as long as you own a lock sufficient to keep the 212 * bucket from disappearing. For example, a common use is: 213 * a. Have a locked INP, but need to lock the TCPID_BUCKET. 214 * b. Add a refcount on the bucket. (Safe because the INP lock prevents 215 * the TCPID_BUCKET from going away.) 216 * c. Drop the INP lock. 217 * d. Acquire a lock on the TCPID_BUCKET. 218 * e. Acquire a lock on the INP. 219 * f. Drop the refcount on the bucket. 220 * (At this point, the bucket may disappear.) 221 * 222 * Expire queue lock: 223 * You can acquire this with either the bucket or INP lock. Don't reverse it. 224 * When the expire code has committed to freeing a node, it resets the expiry 225 * time to SBT_MAX. That is the signal to everyone else that they should 226 * leave that node alone. 227 */ 228static struct rwlock tcp_id_tree_lock; 229#define TCPID_TREE_WLOCK() rw_wlock(&tcp_id_tree_lock) 230#define TCPID_TREE_RLOCK() rw_rlock(&tcp_id_tree_lock) 231#define TCPID_TREE_UPGRADE() rw_try_upgrade(&tcp_id_tree_lock) 232#define TCPID_TREE_WUNLOCK() rw_wunlock(&tcp_id_tree_lock) 233#define TCPID_TREE_RUNLOCK() rw_runlock(&tcp_id_tree_lock) 234#define TCPID_TREE_WLOCK_ASSERT() rw_assert(&tcp_id_tree_lock, RA_WLOCKED) 235#define TCPID_TREE_RLOCK_ASSERT() rw_assert(&tcp_id_tree_lock, RA_RLOCKED) 236#define TCPID_TREE_UNLOCK_ASSERT() rw_assert(&tcp_id_tree_lock, RA_UNLOCKED) 237 238#define TCPID_BUCKET_LOCK_INIT(tlb) mtx_init(&((tlb)->tlb_mtx), "tcp log id bucket", NULL, MTX_DEF) 239#define TCPID_BUCKET_LOCK_DESTROY(tlb) mtx_destroy(&((tlb)->tlb_mtx)) 240#define TCPID_BUCKET_LOCK(tlb) mtx_lock(&((tlb)->tlb_mtx)) 241#define TCPID_BUCKET_UNLOCK(tlb) mtx_unlock(&((tlb)->tlb_mtx)) 242#define TCPID_BUCKET_LOCK_ASSERT(tlb) mtx_assert(&((tlb)->tlb_mtx), MA_OWNED) 243#define TCPID_BUCKET_UNLOCK_ASSERT(tlb) mtx_assert(&((tlb)->tlb_mtx), MA_NOTOWNED) 244 245#define TCPID_BUCKET_REF(tlb) refcount_acquire(&((tlb)->tlb_refcnt)) 246#define TCPID_BUCKET_UNREF(tlb) refcount_release(&((tlb)->tlb_refcnt)) 247 248#define TCPLOG_EXPIREQ_LOCK() mtx_lock(&tcp_log_expireq_mtx) 249#define TCPLOG_EXPIREQ_UNLOCK() mtx_unlock(&tcp_log_expireq_mtx) 250 251SLIST_HEAD(tcp_log_id_head, tcp_log_id_node); 252 253struct tcp_log_id_bucket 254{ 255 /* 256 * tlb_id must be first. This lets us use strcmp on 257 * (struct tcp_log_id_bucket *) and (char *) interchangeably. 258 */ 259 char tlb_id[TCP_LOG_ID_LEN]; 260 char tlb_tag[TCP_LOG_TAG_LEN]; 261 RB_ENTRY(tcp_log_id_bucket) tlb_rb; 262 struct tcp_log_id_head tlb_head; 263 struct mtx tlb_mtx; 264 volatile u_int tlb_refcnt; 265 volatile u_int tlb_reqcnt; 266 uint32_t tlb_loglimit; 267 uint8_t tlb_logstate; 268}; 269 270struct tcp_log_id_node 271{ 272 SLIST_ENTRY(tcp_log_id_node) tln_list; 273 STAILQ_ENTRY(tcp_log_id_node) tln_expireq; /* Locked by the expireq lock */ 274 sbintime_t tln_expiretime; /* Locked by the expireq lock */ 275 276 /* 277 * If INP is NULL, that means the connection has closed. We've 278 * saved the connection endpoint information and the log entries 279 * in the tln_ie and tln_entries members. We've also saved a pointer 280 * to the enclosing bucket here. If INP is not NULL, the information is 281 * in the PCB and not here. 282 */ 283 struct inpcb *tln_inp; 284 struct tcpcb *tln_tp; 285 struct tcp_log_id_bucket *tln_bucket; 286 struct in_endpoints tln_ie; 287 struct tcp_log_stailq tln_entries; 288 int tln_count; 289 volatile int tln_closed; 290 uint8_t tln_af; 291}; 292 293enum tree_lock_state { 294 TREE_UNLOCKED = 0, 295 TREE_RLOCKED, 296 TREE_WLOCKED, 297}; 298 299/* Do we want to select this session for auto-logging? */ 300static __inline bool 301tcp_log_selectauto(void) 302{ 303 304 /* 305 * If we are doing auto-capturing, figure out whether we will capture 306 * this session. 307 */ 308 if (tcp_log_auto_ratio && 309 (tcp_disable_all_bb_logs == 0) && 310 (atomic_fetchadd_long(&tcp_log_auto_ratio_cur, 1) % 311 tcp_log_auto_ratio) == 0) 312 return (true); 313 return (false); 314} 315 316static __inline int 317tcp_log_id_cmp(struct tcp_log_id_bucket *a, struct tcp_log_id_bucket *b) 318{ 319 KASSERT(a != NULL, ("tcp_log_id_cmp: argument a is unexpectedly NULL")); 320 KASSERT(b != NULL, ("tcp_log_id_cmp: argument b is unexpectedly NULL")); 321 return strncmp(a->tlb_id, b->tlb_id, TCP_LOG_ID_LEN); 322} 323 324RB_GENERATE_STATIC(tcp_log_id_tree, tcp_log_id_bucket, tlb_rb, tcp_log_id_cmp) 325 326static __inline void 327tcp_log_id_validate_tree_lock(int tree_locked) 328{ 329 330#ifdef INVARIANTS 331 switch (tree_locked) { 332 case TREE_WLOCKED: 333 TCPID_TREE_WLOCK_ASSERT(); 334 break; 335 case TREE_RLOCKED: 336 TCPID_TREE_RLOCK_ASSERT(); 337 break; 338 case TREE_UNLOCKED: 339 TCPID_TREE_UNLOCK_ASSERT(); 340 break; 341 default: 342 kassert_panic("%s:%d: unknown tree lock state", __func__, 343 __LINE__); 344 } 345#endif 346} 347 348static __inline void 349tcp_log_remove_bucket(struct tcp_log_id_bucket *tlb) 350{ 351 352 TCPID_TREE_WLOCK_ASSERT(); 353 KASSERT(SLIST_EMPTY(&tlb->tlb_head), 354 ("%s: Attempt to remove non-empty bucket", __func__)); 355 if (RB_REMOVE(tcp_log_id_tree, &tcp_log_id_head, tlb) == NULL) { 356#ifdef INVARIANTS 357 kassert_panic("%s:%d: error removing element from tree", 358 __func__, __LINE__); 359#endif 360 } 361 TCPID_BUCKET_LOCK_DESTROY(tlb); 362 counter_u64_add(tcp_log_pcb_ids_cur, (int64_t)-1); 363 uma_zfree(tcp_log_bucket_zone, tlb); 364} 365 366/* 367 * Call with a referenced and locked bucket. 368 * Will return true if the bucket was freed; otherwise, false. 369 * tlb: The bucket to unreference. 370 * tree_locked: A pointer to the state of the tree lock. If the tree lock 371 * state changes, the function will update it. 372 * inp: If not NULL and the function needs to drop the inp lock to relock the 373 * tree, it will do so. (The caller must ensure inp will not become invalid, 374 * probably by holding a reference to it.) 375 */ 376static bool 377tcp_log_unref_bucket(struct tcp_log_id_bucket *tlb, int *tree_locked, 378 struct inpcb *inp) 379{ 380 381 KASSERT(tlb != NULL, ("%s: called with NULL tlb", __func__)); 382 KASSERT(tree_locked != NULL, ("%s: called with NULL tree_locked", 383 __func__)); 384 385 tcp_log_id_validate_tree_lock(*tree_locked); 386 387 /* 388 * Did we hold the last reference on the tlb? If so, we may need 389 * to free it. (Note that we can realistically only execute the 390 * loop twice: once without a write lock and once with a write 391 * lock.) 392 */ 393 while (TCPID_BUCKET_UNREF(tlb)) { 394 /* 395 * We need a write lock on the tree to free this. 396 * If we can upgrade the tree lock, this is "easy". If we 397 * can't upgrade the tree lock, we need to do this the 398 * "hard" way: unwind all our locks and relock everything. 399 * In the meantime, anything could have changed. We even 400 * need to validate that we still need to free the bucket. 401 */ 402 if (*tree_locked == TREE_RLOCKED && TCPID_TREE_UPGRADE()) 403 *tree_locked = TREE_WLOCKED; 404 else if (*tree_locked != TREE_WLOCKED) { 405 TCPID_BUCKET_REF(tlb); 406 if (inp != NULL) 407 INP_WUNLOCK(inp); 408 TCPID_BUCKET_UNLOCK(tlb); 409 if (*tree_locked == TREE_RLOCKED) 410 TCPID_TREE_RUNLOCK(); 411 TCPID_TREE_WLOCK(); 412 *tree_locked = TREE_WLOCKED; 413 TCPID_BUCKET_LOCK(tlb); 414 if (inp != NULL) 415 INP_WLOCK(inp); 416 continue; 417 } 418 419 /* 420 * We have an empty bucket and a write lock on the tree. 421 * Remove the empty bucket. 422 */ 423 tcp_log_remove_bucket(tlb); 424 return (true); 425 } 426 return (false); 427} 428 429/* 430 * Call with a locked bucket. This function will release the lock on the 431 * bucket before returning. 432 * 433 * The caller is responsible for freeing the tp->t_lin/tln node! 434 * 435 * Note: one of tp or both tlb and tln must be supplied. 436 * 437 * inp: A pointer to the inp. If the function needs to drop the inp lock to 438 * acquire the tree write lock, it will do so. (The caller must ensure inp 439 * will not become invalid, probably by holding a reference to it.) 440 * tp: A pointer to the tcpcb. (optional; if specified, tlb and tln are ignored) 441 * tlb: A pointer to the bucket. (optional; ignored if tp is specified) 442 * tln: A pointer to the node. (optional; ignored if tp is specified) 443 * tree_locked: A pointer to the state of the tree lock. If the tree lock 444 * state changes, the function will update it. 445 * 446 * Will return true if the INP lock was reacquired; otherwise, false. 447 */ 448static bool 449tcp_log_remove_id_node(struct inpcb *inp, struct tcpcb *tp, 450 struct tcp_log_id_bucket *tlb, struct tcp_log_id_node *tln, 451 int *tree_locked) 452{ 453 int orig_tree_locked; 454 455 KASSERT(tp != NULL || (tlb != NULL && tln != NULL), 456 ("%s: called with tp=%p, tlb=%p, tln=%p", __func__, 457 tp, tlb, tln)); 458 KASSERT(tree_locked != NULL, ("%s: called with NULL tree_locked", 459 __func__)); 460 461 if (tp != NULL) { 462 tlb = tp->t_lib; 463 tln = tp->t_lin; 464 KASSERT(tlb != NULL, ("%s: unexpectedly NULL tlb", __func__)); 465 KASSERT(tln != NULL, ("%s: unexpectedly NULL tln", __func__)); 466 } 467 468 tcp_log_id_validate_tree_lock(*tree_locked); 469 TCPID_BUCKET_LOCK_ASSERT(tlb); 470 471 /* 472 * Remove the node, clear the log bucket and node from the TCPCB, and 473 * decrement the bucket refcount. In the process, if this is the 474 * last reference, the bucket will be freed. 475 */ 476 SLIST_REMOVE(&tlb->tlb_head, tln, tcp_log_id_node, tln_list); 477 if (tp != NULL) { 478 tp->t_lib = NULL; 479 tp->t_lin = NULL; 480 } 481 orig_tree_locked = *tree_locked; 482 if (!tcp_log_unref_bucket(tlb, tree_locked, inp)) 483 TCPID_BUCKET_UNLOCK(tlb); 484 return (*tree_locked != orig_tree_locked); 485} 486 487#define RECHECK_INP_CLEAN(cleanup) do { \ 488 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 489 rv = ECONNRESET; \ 490 cleanup; \ 491 goto done; \ 492 } \ 493 tp = intotcpcb(inp); \ 494} while (0) 495 496#define RECHECK_INP() RECHECK_INP_CLEAN(/* noop */) 497 498static void 499tcp_log_grow_tlb(char *tlb_id, struct tcpcb *tp) 500{ 501 502 INP_WLOCK_ASSERT(tp->t_inpcb); 503 504#ifdef STATS 505 if (V_tcp_perconn_stats_enable == 2 && tp->t_stats == NULL) 506 (void)tcp_stats_sample_rollthedice(tp, tlb_id, strlen(tlb_id)); 507#endif 508} 509 510static void 511tcp_log_increment_reqcnt(struct tcp_log_id_bucket *tlb) 512{ 513 514 atomic_fetchadd_int(&tlb->tlb_reqcnt, 1); 515} 516 517/* 518 * Associate the specified tag with a particular TCP log ID. 519 * Called with INPCB locked. Returns with it unlocked. 520 * Returns 0 on success or EOPNOTSUPP if the connection has no TCP log ID. 521 */ 522int 523tcp_log_set_tag(struct tcpcb *tp, char *tag) 524{ 525 struct tcp_log_id_bucket *tlb; 526 int tree_locked; 527 528 INP_WLOCK_ASSERT(tp->t_inpcb); 529 530 tree_locked = TREE_UNLOCKED; 531 tlb = tp->t_lib; 532 if (tlb == NULL) { 533 INP_WUNLOCK(tp->t_inpcb); 534 return (EOPNOTSUPP); 535 } 536 537 TCPID_BUCKET_REF(tlb); 538 INP_WUNLOCK(tp->t_inpcb); 539 TCPID_BUCKET_LOCK(tlb); 540 strlcpy(tlb->tlb_tag, tag, TCP_LOG_TAG_LEN); 541 if (!tcp_log_unref_bucket(tlb, &tree_locked, NULL)) 542 TCPID_BUCKET_UNLOCK(tlb); 543 544 if (tree_locked == TREE_WLOCKED) { 545 TCPID_TREE_WLOCK_ASSERT(); 546 TCPID_TREE_WUNLOCK(); 547 } else if (tree_locked == TREE_RLOCKED) { 548 TCPID_TREE_RLOCK_ASSERT(); 549 TCPID_TREE_RUNLOCK(); 550 } else 551 TCPID_TREE_UNLOCK_ASSERT(); 552 553 return (0); 554} 555 556/* 557 * Set the TCP log ID for a TCPCB. 558 * Called with INPCB locked. Returns with it unlocked. 559 */ 560int 561tcp_log_set_id(struct tcpcb *tp, char *id) 562{ 563 struct tcp_log_id_bucket *tlb, *tmp_tlb; 564 struct tcp_log_id_node *tln; 565 struct inpcb *inp; 566 int tree_locked, rv; 567 bool bucket_locked; 568 569 tlb = NULL; 570 tln = NULL; 571 inp = tp->t_inpcb; 572 tree_locked = TREE_UNLOCKED; 573 bucket_locked = false; 574 575restart: 576 INP_WLOCK_ASSERT(inp); 577 578 /* See if the ID is unchanged. */ 579 if ((tp->t_lib != NULL && !strcmp(tp->t_lib->tlb_id, id)) || 580 (tp->t_lib == NULL && *id == 0)) { 581 if (tp->t_lib != NULL) { 582 tcp_log_increment_reqcnt(tp->t_lib); 583 if ((tp->t_lib->tlb_logstate) && 584 (tp->t_log_state_set == 0)) { 585 /* Clone in any logging */ 586 587 tp->t_logstate = tp->t_lib->tlb_logstate; 588 } 589 if ((tp->t_lib->tlb_loglimit) && 590 (tp->t_log_state_set == 0)) { 591 /* We also have a limit set */ 592 593 tp->t_loglimit = tp->t_lib->tlb_loglimit; 594 } 595 } 596 rv = 0; 597 goto done; 598 } 599 600 /* 601 * If the TCPCB had a previous ID, we need to extricate it from 602 * the previous list. 603 * 604 * Drop the TCPCB lock and lock the tree and the bucket. 605 * Because this is called in the socket context, we (theoretically) 606 * don't need to worry about the INPCB completely going away 607 * while we are gone. 608 */ 609 if (tp->t_lib != NULL) { 610 tlb = tp->t_lib; 611 TCPID_BUCKET_REF(tlb); 612 INP_WUNLOCK(inp); 613 614 if (tree_locked == TREE_UNLOCKED) { 615 TCPID_TREE_RLOCK(); 616 tree_locked = TREE_RLOCKED; 617 } 618 TCPID_BUCKET_LOCK(tlb); 619 bucket_locked = true; 620 INP_WLOCK(inp); 621 622 /* 623 * Unreference the bucket. If our bucket went away, it is no 624 * longer locked or valid. 625 */ 626 if (tcp_log_unref_bucket(tlb, &tree_locked, inp)) { 627 bucket_locked = false; 628 tlb = NULL; 629 } 630 631 /* Validate the INP. */ 632 RECHECK_INP(); 633 634 /* 635 * Evaluate whether the bucket changed while we were unlocked. 636 * 637 * Possible scenarios here: 638 * 1. Bucket is unchanged and the same one we started with. 639 * 2. The TCPCB no longer has a bucket and our bucket was 640 * freed. 641 * 3. The TCPCB has a new bucket, whether ours was freed. 642 * 4. The TCPCB no longer has a bucket and our bucket was 643 * not freed. 644 * 645 * In cases 2-4, we will start over. In case 1, we will 646 * proceed here to remove the bucket. 647 */ 648 if (tlb == NULL || tp->t_lib != tlb) { 649 KASSERT(bucket_locked || tlb == NULL, 650 ("%s: bucket_locked (%d) and tlb (%p) are " 651 "inconsistent", __func__, bucket_locked, tlb)); 652 653 if (bucket_locked) { 654 TCPID_BUCKET_UNLOCK(tlb); 655 bucket_locked = false; 656 tlb = NULL; 657 } 658 goto restart; 659 } 660 661 /* 662 * Store the (struct tcp_log_id_node) for reuse. Then, remove 663 * it from the bucket. In the process, we may end up relocking. 664 * If so, we need to validate that the INP is still valid, and 665 * the TCPCB entries match we expect. 666 * 667 * We will clear tlb and change the bucket_locked state just 668 * before calling tcp_log_remove_id_node(), since that function 669 * will unlock the bucket. 670 */ 671 if (tln != NULL) 672 uma_zfree(tcp_log_node_zone, tln); 673 tln = tp->t_lin; 674 tlb = NULL; 675 bucket_locked = false; 676 if (tcp_log_remove_id_node(inp, tp, NULL, NULL, &tree_locked)) { 677 RECHECK_INP(); 678 679 /* 680 * If the TCPCB moved to a new bucket while we had 681 * dropped the lock, restart. 682 */ 683 if (tp->t_lib != NULL || tp->t_lin != NULL) 684 goto restart; 685 } 686 687 /* 688 * Yay! We successfully removed the TCPCB from its old 689 * bucket. Phew! 690 * 691 * On to bigger and better things... 692 */ 693 } 694 695 /* At this point, the TCPCB should not be in any bucket. */ 696 KASSERT(tp->t_lib == NULL, ("%s: tp->t_lib is not NULL", __func__)); 697 698 /* 699 * If the new ID is not empty, we need to now assign this TCPCB to a 700 * new bucket. 701 */ 702 if (*id) { 703 /* Get a new tln, if we don't already have one to reuse. */ 704 if (tln == NULL) { 705 tln = uma_zalloc(tcp_log_node_zone, M_NOWAIT | M_ZERO); 706 if (tln == NULL) { 707 rv = ENOBUFS; 708 goto done; 709 } 710 tln->tln_inp = inp; 711 tln->tln_tp = tp; 712 } 713 714 /* 715 * Drop the INP lock for a bit. We don't need it, and dropping 716 * it prevents lock order reversals. 717 */ 718 INP_WUNLOCK(inp); 719 720 /* Make sure we have at least a read lock on the tree. */ 721 tcp_log_id_validate_tree_lock(tree_locked); 722 if (tree_locked == TREE_UNLOCKED) { 723 TCPID_TREE_RLOCK(); 724 tree_locked = TREE_RLOCKED; 725 } 726 727refind: 728 /* 729 * Remember that we constructed (struct tcp_log_id_node) so 730 * we can safely cast the id to it for the purposes of finding. 731 */ 732 KASSERT(tlb == NULL, ("%s:%d tlb unexpectedly non-NULL", 733 __func__, __LINE__)); 734 tmp_tlb = RB_FIND(tcp_log_id_tree, &tcp_log_id_head, 735 (struct tcp_log_id_bucket *) id); 736 737 /* 738 * If we didn't find a matching bucket, we need to add a new 739 * one. This requires a write lock. But, of course, we will 740 * need to recheck some things when we re-acquire the lock. 741 */ 742 if (tmp_tlb == NULL && tree_locked != TREE_WLOCKED) { 743 tree_locked = TREE_WLOCKED; 744 if (!TCPID_TREE_UPGRADE()) { 745 TCPID_TREE_RUNLOCK(); 746 TCPID_TREE_WLOCK(); 747 748 /* 749 * The tree may have changed while we were 750 * unlocked. 751 */ 752 goto refind; 753 } 754 } 755 756 /* If we need to add a new bucket, do it now. */ 757 if (tmp_tlb == NULL) { 758 /* Allocate new bucket. */ 759 tlb = uma_zalloc(tcp_log_bucket_zone, M_NOWAIT); 760 if (tlb == NULL) { 761 rv = ENOBUFS; 762 goto done_noinp; 763 } 764 counter_u64_add(tcp_log_pcb_ids_cur, 1); 765 counter_u64_add(tcp_log_pcb_ids_tot, 1); 766 767 if ((tcp_log_auto_all == false) && 768 tcp_log_auto_mode && 769 tcp_log_selectauto()) { 770 /* Save off the log state */ 771 tlb->tlb_logstate = tcp_log_auto_mode; 772 } else 773 tlb->tlb_logstate = TCP_LOG_STATE_OFF; 774 tlb->tlb_loglimit = 0; 775 tlb->tlb_tag[0] = '\0'; /* Default to an empty tag. */ 776 777 /* 778 * Copy the ID to the bucket. 779 * NB: Don't use strlcpy() unless you are sure 780 * we've always validated NULL termination. 781 * 782 * TODO: When I'm done writing this, see if we 783 * we have correctly validated NULL termination and 784 * can use strlcpy(). :-) 785 */ 786 strncpy(tlb->tlb_id, id, TCP_LOG_ID_LEN - 1); 787 tlb->tlb_id[TCP_LOG_ID_LEN - 1] = '\0'; 788 789 /* 790 * Take the refcount for the first node and go ahead 791 * and lock this. Note that we zero the tlb_mtx 792 * structure, since 0xdeadc0de flips the right bits 793 * for the code to think that this mutex has already 794 * been initialized. :-( 795 */ 796 SLIST_INIT(&tlb->tlb_head); 797 refcount_init(&tlb->tlb_refcnt, 1); 798 tlb->tlb_reqcnt = 1; 799 memset(&tlb->tlb_mtx, 0, sizeof(struct mtx)); 800 TCPID_BUCKET_LOCK_INIT(tlb); 801 TCPID_BUCKET_LOCK(tlb); 802 bucket_locked = true; 803 804#define FREE_NEW_TLB() do { \ 805 TCPID_BUCKET_LOCK_DESTROY(tlb); \ 806 uma_zfree(tcp_log_bucket_zone, tlb); \ 807 counter_u64_add(tcp_log_pcb_ids_cur, (int64_t)-1); \ 808 counter_u64_add(tcp_log_pcb_ids_tot, (int64_t)-1); \ 809 bucket_locked = false; \ 810 tlb = NULL; \ 811} while (0) 812 /* 813 * Relock the INP and make sure we are still 814 * unassigned. 815 */ 816 INP_WLOCK(inp); 817 RECHECK_INP_CLEAN(FREE_NEW_TLB()); 818 if (tp->t_lib != NULL) { 819 FREE_NEW_TLB(); 820 goto restart; 821 } 822 823 /* Add the new bucket to the tree. */ 824 tmp_tlb = RB_INSERT(tcp_log_id_tree, &tcp_log_id_head, 825 tlb); 826 KASSERT(tmp_tlb == NULL, 827 ("%s: Unexpected conflicting bucket (%p) while " 828 "adding new bucket (%p)", __func__, tmp_tlb, tlb)); 829 830 /* 831 * If we found a conflicting bucket, free the new 832 * one we made and fall through to use the existing 833 * bucket. 834 */ 835 if (tmp_tlb != NULL) { 836 FREE_NEW_TLB(); 837 INP_WUNLOCK(inp); 838 } 839#undef FREE_NEW_TLB 840 } 841 842 /* If we found an existing bucket, use it. */ 843 if (tmp_tlb != NULL) { 844 tlb = tmp_tlb; 845 TCPID_BUCKET_LOCK(tlb); 846 bucket_locked = true; 847 848 /* 849 * Relock the INP and make sure we are still 850 * unassigned. 851 */ 852 INP_UNLOCK_ASSERT(inp); 853 INP_WLOCK(inp); 854 RECHECK_INP(); 855 if (tp->t_lib != NULL) { 856 TCPID_BUCKET_UNLOCK(tlb); 857 bucket_locked = false; 858 tlb = NULL; 859 goto restart; 860 } 861 862 /* Take a reference on the bucket. */ 863 TCPID_BUCKET_REF(tlb); 864 865 /* Record the request. */ 866 tcp_log_increment_reqcnt(tlb); 867 } 868 869 tcp_log_grow_tlb(tlb->tlb_id, tp); 870 871 /* Add the new node to the list. */ 872 SLIST_INSERT_HEAD(&tlb->tlb_head, tln, tln_list); 873 tp->t_lib = tlb; 874 tp->t_lin = tln; 875 if (tp->t_lib->tlb_logstate) { 876 /* Clone in any logging */ 877 878 tp->t_logstate = tp->t_lib->tlb_logstate; 879 } 880 if (tp->t_lib->tlb_loglimit) { 881 /* The loglimit too */ 882 883 tp->t_loglimit = tp->t_lib->tlb_loglimit; 884 } 885 tln = NULL; 886 } 887 888 rv = 0; 889 890done: 891 /* Unlock things, as needed, and return. */ 892 INP_WUNLOCK(inp); 893done_noinp: 894 INP_UNLOCK_ASSERT(inp); 895 if (bucket_locked) { 896 TCPID_BUCKET_LOCK_ASSERT(tlb); 897 TCPID_BUCKET_UNLOCK(tlb); 898 } else if (tlb != NULL) 899 TCPID_BUCKET_UNLOCK_ASSERT(tlb); 900 if (tree_locked == TREE_WLOCKED) { 901 TCPID_TREE_WLOCK_ASSERT(); 902 TCPID_TREE_WUNLOCK(); 903 } else if (tree_locked == TREE_RLOCKED) { 904 TCPID_TREE_RLOCK_ASSERT(); 905 TCPID_TREE_RUNLOCK(); 906 } else 907 TCPID_TREE_UNLOCK_ASSERT(); 908 if (tln != NULL) 909 uma_zfree(tcp_log_node_zone, tln); 910 return (rv); 911} 912 913/* 914 * Get the TCP log ID for a TCPCB. 915 * Called with INPCB locked. 916 * 'buf' must point to a buffer that is at least TCP_LOG_ID_LEN bytes long. 917 * Returns number of bytes copied. 918 */ 919size_t 920tcp_log_get_id(struct tcpcb *tp, char *buf) 921{ 922 size_t len; 923 924 INP_LOCK_ASSERT(tp->t_inpcb); 925 if (tp->t_lib != NULL) { 926 len = strlcpy(buf, tp->t_lib->tlb_id, TCP_LOG_ID_LEN); 927 KASSERT(len < TCP_LOG_ID_LEN, 928 ("%s:%d: tp->t_lib->tlb_id too long (%zu)", 929 __func__, __LINE__, len)); 930 } else { 931 *buf = '\0'; 932 len = 0; 933 } 934 return (len); 935} 936 937/* 938 * Get the tag associated with the TCPCB's log ID. 939 * Called with INPCB locked. Returns with it unlocked. 940 * 'buf' must point to a buffer that is at least TCP_LOG_TAG_LEN bytes long. 941 * Returns number of bytes copied. 942 */ 943size_t 944tcp_log_get_tag(struct tcpcb *tp, char *buf) 945{ 946 struct tcp_log_id_bucket *tlb; 947 size_t len; 948 int tree_locked; 949 950 INP_WLOCK_ASSERT(tp->t_inpcb); 951 952 tree_locked = TREE_UNLOCKED; 953 tlb = tp->t_lib; 954 955 if (tlb != NULL) { 956 TCPID_BUCKET_REF(tlb); 957 INP_WUNLOCK(tp->t_inpcb); 958 TCPID_BUCKET_LOCK(tlb); 959 len = strlcpy(buf, tlb->tlb_tag, TCP_LOG_TAG_LEN); 960 KASSERT(len < TCP_LOG_TAG_LEN, 961 ("%s:%d: tp->t_lib->tlb_tag too long (%zu)", 962 __func__, __LINE__, len)); 963 if (!tcp_log_unref_bucket(tlb, &tree_locked, NULL)) 964 TCPID_BUCKET_UNLOCK(tlb); 965 966 if (tree_locked == TREE_WLOCKED) { 967 TCPID_TREE_WLOCK_ASSERT(); 968 TCPID_TREE_WUNLOCK(); 969 } else if (tree_locked == TREE_RLOCKED) { 970 TCPID_TREE_RLOCK_ASSERT(); 971 TCPID_TREE_RUNLOCK(); 972 } else 973 TCPID_TREE_UNLOCK_ASSERT(); 974 } else { 975 INP_WUNLOCK(tp->t_inpcb); 976 *buf = '\0'; 977 len = 0; 978 } 979 980 return (len); 981} 982 983/* 984 * Get number of connections with the same log ID. 985 * Log ID is taken from given TCPCB. 986 * Called with INPCB locked. 987 */ 988u_int 989tcp_log_get_id_cnt(struct tcpcb *tp) 990{ 991 992 INP_WLOCK_ASSERT(tp->t_inpcb); 993 return ((tp->t_lib == NULL) ? 0 : tp->t_lib->tlb_refcnt); 994} 995 996#ifdef TCPLOG_DEBUG_RINGBUF 997/* 998 * Functions/macros to increment/decrement reference count for a log 999 * entry. This should catch when we do a double-free/double-remove or 1000 * a double-add. 1001 */ 1002static inline void 1003_tcp_log_entry_refcnt_add(struct tcp_log_mem *log_entry, const char *func, 1004 int line) 1005{ 1006 int refcnt; 1007 1008 refcnt = atomic_fetchadd_int(&log_entry->tlm_refcnt, 1); 1009 if (refcnt != 0) 1010 panic("%s:%d: log_entry(%p)->tlm_refcnt is %d (expected 0)", 1011 func, line, log_entry, refcnt); 1012} 1013#define tcp_log_entry_refcnt_add(l) \ 1014 _tcp_log_entry_refcnt_add((l), __func__, __LINE__) 1015 1016static inline void 1017_tcp_log_entry_refcnt_rem(struct tcp_log_mem *log_entry, const char *func, 1018 int line) 1019{ 1020 int refcnt; 1021 1022 refcnt = atomic_fetchadd_int(&log_entry->tlm_refcnt, -1); 1023 if (refcnt != 1) 1024 panic("%s:%d: log_entry(%p)->tlm_refcnt is %d (expected 1)", 1025 func, line, log_entry, refcnt); 1026} 1027#define tcp_log_entry_refcnt_rem(l) \ 1028 _tcp_log_entry_refcnt_rem((l), __func__, __LINE__) 1029 1030#else /* !TCPLOG_DEBUG_RINGBUF */ 1031 1032#define tcp_log_entry_refcnt_add(l) 1033#define tcp_log_entry_refcnt_rem(l) 1034 1035#endif 1036 1037/* 1038 * Cleanup after removing a log entry, but only decrement the count if we 1039 * are running INVARIANTS. 1040 */ 1041static inline void 1042tcp_log_free_log_common(struct tcp_log_mem *log_entry, int *count __unused) 1043{ 1044 1045 uma_zfree(tcp_log_zone, log_entry); 1046#ifdef INVARIANTS 1047 (*count)--; 1048 KASSERT(*count >= 0, 1049 ("%s: count unexpectedly negative", __func__)); 1050#endif 1051} 1052 1053static void 1054tcp_log_free_entries(struct tcp_log_stailq *head, int *count) 1055{ 1056 struct tcp_log_mem *log_entry; 1057 1058 /* Free the entries. */ 1059 while ((log_entry = STAILQ_FIRST(head)) != NULL) { 1060 STAILQ_REMOVE_HEAD(head, tlm_queue); 1061 tcp_log_entry_refcnt_rem(log_entry); 1062 tcp_log_free_log_common(log_entry, count); 1063 } 1064} 1065 1066/* Cleanup after removing a log entry. */ 1067static inline void 1068tcp_log_remove_log_cleanup(struct tcpcb *tp, struct tcp_log_mem *log_entry) 1069{ 1070 uma_zfree(tcp_log_zone, log_entry); 1071 tp->t_lognum--; 1072 KASSERT(tp->t_lognum >= 0, 1073 ("%s: tp->t_lognum unexpectedly negative", __func__)); 1074} 1075 1076/* Remove a log entry from the head of a list. */ 1077static inline void 1078tcp_log_remove_log_head(struct tcpcb *tp, struct tcp_log_mem *log_entry) 1079{ 1080 1081 KASSERT(log_entry == STAILQ_FIRST(&tp->t_logs), 1082 ("%s: attempt to remove non-HEAD log entry", __func__)); 1083 STAILQ_REMOVE_HEAD(&tp->t_logs, tlm_queue); 1084 tcp_log_entry_refcnt_rem(log_entry); 1085 tcp_log_remove_log_cleanup(tp, log_entry); 1086} 1087 1088#ifdef TCPLOG_DEBUG_RINGBUF 1089/* 1090 * Initialize the log entry's reference count, which we want to 1091 * survive allocations. 1092 */ 1093static int 1094tcp_log_zone_init(void *mem, int size, int flags __unused) 1095{ 1096 struct tcp_log_mem *tlm; 1097 1098 KASSERT(size >= sizeof(struct tcp_log_mem), 1099 ("%s: unexpectedly short (%d) allocation", __func__, size)); 1100 tlm = (struct tcp_log_mem *)mem; 1101 tlm->tlm_refcnt = 0; 1102 return (0); 1103} 1104 1105/* 1106 * Double check that the refcnt is zero on allocation and return. 1107 */ 1108static int 1109tcp_log_zone_ctor(void *mem, int size, void *args __unused, int flags __unused) 1110{ 1111 struct tcp_log_mem *tlm; 1112 1113 KASSERT(size >= sizeof(struct tcp_log_mem), 1114 ("%s: unexpectedly short (%d) allocation", __func__, size)); 1115 tlm = (struct tcp_log_mem *)mem; 1116 if (tlm->tlm_refcnt != 0) 1117 panic("%s:%d: tlm(%p)->tlm_refcnt is %d (expected 0)", 1118 __func__, __LINE__, tlm, tlm->tlm_refcnt); 1119 return (0); 1120} 1121 1122static void 1123tcp_log_zone_dtor(void *mem, int size, void *args __unused) 1124{ 1125 struct tcp_log_mem *tlm; 1126 1127 KASSERT(size >= sizeof(struct tcp_log_mem), 1128 ("%s: unexpectedly short (%d) allocation", __func__, size)); 1129 tlm = (struct tcp_log_mem *)mem; 1130 if (tlm->tlm_refcnt != 0) 1131 panic("%s:%d: tlm(%p)->tlm_refcnt is %d (expected 0)", 1132 __func__, __LINE__, tlm, tlm->tlm_refcnt); 1133} 1134#endif /* TCPLOG_DEBUG_RINGBUF */ 1135 1136/* Do global initialization. */ 1137void 1138tcp_log_init(void) 1139{ 1140 1141 tcp_log_zone = uma_zcreate("tcp_log", sizeof(struct tcp_log_mem), 1142#ifdef TCPLOG_DEBUG_RINGBUF 1143 tcp_log_zone_ctor, tcp_log_zone_dtor, tcp_log_zone_init, 1144#else 1145 NULL, NULL, NULL, 1146#endif 1147 NULL, UMA_ALIGN_PTR, 0); 1148 (void)uma_zone_set_max(tcp_log_zone, TCP_LOG_BUF_DEFAULT_GLOBAL_LIMIT); 1149 tcp_log_bucket_zone = uma_zcreate("tcp_log_bucket", 1150 sizeof(struct tcp_log_id_bucket), NULL, NULL, NULL, NULL, 1151 UMA_ALIGN_PTR, 0); 1152 tcp_log_node_zone = uma_zcreate("tcp_log_node", 1153 sizeof(struct tcp_log_id_node), NULL, NULL, NULL, NULL, 1154 UMA_ALIGN_PTR, 0); 1155#ifdef TCPLOG_DEBUG_COUNTERS 1156 tcp_log_queued = counter_u64_alloc(M_WAITOK); 1157 tcp_log_que_fail1 = counter_u64_alloc(M_WAITOK); 1158 tcp_log_que_fail2 = counter_u64_alloc(M_WAITOK); 1159 tcp_log_que_fail3 = counter_u64_alloc(M_WAITOK); 1160 tcp_log_que_fail4 = counter_u64_alloc(M_WAITOK); 1161 tcp_log_que_fail5 = counter_u64_alloc(M_WAITOK); 1162 tcp_log_que_copyout = counter_u64_alloc(M_WAITOK); 1163 tcp_log_que_read = counter_u64_alloc(M_WAITOK); 1164 tcp_log_que_freed = counter_u64_alloc(M_WAITOK); 1165#endif 1166 tcp_log_pcb_ids_cur = counter_u64_alloc(M_WAITOK); 1167 tcp_log_pcb_ids_tot = counter_u64_alloc(M_WAITOK); 1168 1169 rw_init_flags(&tcp_id_tree_lock, "TCP ID tree", RW_NEW); 1170 mtx_init(&tcp_log_expireq_mtx, "TCP log expireq", NULL, MTX_DEF); 1171 callout_init(&tcp_log_expireq_callout, 1); 1172} 1173 1174/* Do per-TCPCB initialization. */ 1175void 1176tcp_log_tcpcbinit(struct tcpcb *tp) 1177{ 1178 1179 /* A new TCPCB should start out zero-initialized. */ 1180 STAILQ_INIT(&tp->t_logs); 1181 1182 /* 1183 * If we are doing auto-capturing, figure out whether we will capture 1184 * this session. 1185 */ 1186 tp->t_loglimit = tcp_log_session_limit; 1187 if ((tcp_log_auto_all == true) && 1188 tcp_log_auto_mode && 1189 tcp_log_selectauto()) { 1190 tp->t_logstate = tcp_log_auto_mode; 1191 tp->t_flags2 |= TF2_LOG_AUTO; 1192 } 1193} 1194 1195/* Remove entries */ 1196static void 1197tcp_log_expire(void *unused __unused) 1198{ 1199 struct tcp_log_id_bucket *tlb; 1200 struct tcp_log_id_node *tln; 1201 sbintime_t expiry_limit; 1202 int tree_locked; 1203 1204 TCPLOG_EXPIREQ_LOCK(); 1205 if (callout_pending(&tcp_log_expireq_callout)) { 1206 /* Callout was reset. */ 1207 TCPLOG_EXPIREQ_UNLOCK(); 1208 return; 1209 } 1210 1211 /* 1212 * Process entries until we reach one that expires too far in the 1213 * future. Look one second in the future. 1214 */ 1215 expiry_limit = getsbinuptime() + SBT_1S; 1216 tree_locked = TREE_UNLOCKED; 1217 1218 while ((tln = STAILQ_FIRST(&tcp_log_expireq_head)) != NULL && 1219 tln->tln_expiretime <= expiry_limit) { 1220 if (!callout_active(&tcp_log_expireq_callout)) { 1221 /* 1222 * Callout was stopped. I guess we should 1223 * just quit at this point. 1224 */ 1225 TCPLOG_EXPIREQ_UNLOCK(); 1226 return; 1227 } 1228 1229 /* 1230 * Remove the node from the head of the list and unlock 1231 * the list. Change the expiry time to SBT_MAX as a signal 1232 * to other threads that we now own this. 1233 */ 1234 STAILQ_REMOVE_HEAD(&tcp_log_expireq_head, tln_expireq); 1235 tln->tln_expiretime = SBT_MAX; 1236 TCPLOG_EXPIREQ_UNLOCK(); 1237 1238 /* 1239 * Remove the node from the bucket. 1240 */ 1241 tlb = tln->tln_bucket; 1242 TCPID_BUCKET_LOCK(tlb); 1243 if (tcp_log_remove_id_node(NULL, NULL, tlb, tln, &tree_locked)) { 1244 tcp_log_id_validate_tree_lock(tree_locked); 1245 if (tree_locked == TREE_WLOCKED) 1246 TCPID_TREE_WUNLOCK(); 1247 else 1248 TCPID_TREE_RUNLOCK(); 1249 tree_locked = TREE_UNLOCKED; 1250 } 1251 1252 /* Drop the INP reference. */ 1253 INP_WLOCK(tln->tln_inp); 1254 if (!in_pcbrele_wlocked(tln->tln_inp)) 1255 INP_WUNLOCK(tln->tln_inp); 1256 1257 /* Free the log records. */ 1258 tcp_log_free_entries(&tln->tln_entries, &tln->tln_count); 1259 1260 /* Free the node. */ 1261 uma_zfree(tcp_log_node_zone, tln); 1262 1263 /* Relock the expiry queue. */ 1264 TCPLOG_EXPIREQ_LOCK(); 1265 } 1266 1267 /* 1268 * We've expired all the entries we can. Do we need to reschedule 1269 * ourselves? 1270 */ 1271 callout_deactivate(&tcp_log_expireq_callout); 1272 if (tln != NULL) { 1273 /* 1274 * Get max(now + TCP_LOG_EXPIRE_INTVL, tln->tln_expiretime) and 1275 * set the next callout to that. (This helps ensure we generally 1276 * run the callout no more often than desired.) 1277 */ 1278 expiry_limit = getsbinuptime() + TCP_LOG_EXPIRE_INTVL; 1279 if (expiry_limit < tln->tln_expiretime) 1280 expiry_limit = tln->tln_expiretime; 1281 callout_reset_sbt(&tcp_log_expireq_callout, expiry_limit, 1282 SBT_1S, tcp_log_expire, NULL, C_ABSOLUTE); 1283 } 1284 1285 /* We're done. */ 1286 TCPLOG_EXPIREQ_UNLOCK(); 1287 return; 1288} 1289 1290/* 1291 * Move log data from the TCPCB to a new node. This will reset the TCPCB log 1292 * entries and log count; however, it will not touch other things from the 1293 * TCPCB (e.g. t_lin, t_lib). 1294 * 1295 * NOTE: Must hold a lock on the INP. 1296 */ 1297static void 1298tcp_log_move_tp_to_node(struct tcpcb *tp, struct tcp_log_id_node *tln) 1299{ 1300 1301 INP_WLOCK_ASSERT(tp->t_inpcb); 1302 1303 tln->tln_ie = tp->t_inpcb->inp_inc.inc_ie; 1304 if (tp->t_inpcb->inp_inc.inc_flags & INC_ISIPV6) 1305 tln->tln_af = AF_INET6; 1306 else 1307 tln->tln_af = AF_INET; 1308 tln->tln_entries = tp->t_logs; 1309 tln->tln_count = tp->t_lognum; 1310 tln->tln_bucket = tp->t_lib; 1311 1312 /* Clear information from the PCB. */ 1313 STAILQ_INIT(&tp->t_logs); 1314 tp->t_lognum = 0; 1315} 1316 1317/* Do per-TCPCB cleanup */ 1318void 1319tcp_log_tcpcbfini(struct tcpcb *tp) 1320{ 1321 struct tcp_log_id_node *tln, *tln_first; 1322 struct tcp_log_mem *log_entry; 1323 sbintime_t callouttime; 1324 1325 INP_WLOCK_ASSERT(tp->t_inpcb); 1326 1327 TCP_LOG_EVENT(tp, NULL, NULL, NULL, TCP_LOG_CONNEND, 0, 0, NULL, false); 1328 1329 /* 1330 * If we were gathering packets to be automatically dumped, try to do 1331 * it now. If this succeeds, the log information in the TCPCB will be 1332 * cleared. Otherwise, we'll handle the log information as we do 1333 * for other states. 1334 */ 1335 switch(tp->t_logstate) { 1336 case TCP_LOG_STATE_HEAD_AUTO: 1337 (void)tcp_log_dump_tp_logbuf(tp, "auto-dumped from head", 1338 M_NOWAIT, false); 1339 break; 1340 case TCP_LOG_STATE_TAIL_AUTO: 1341 (void)tcp_log_dump_tp_logbuf(tp, "auto-dumped from tail", 1342 M_NOWAIT, false); 1343 break; 1344 case TCP_LOG_STATE_CONTINUAL: 1345 (void)tcp_log_dump_tp_logbuf(tp, "auto-dumped from continual", 1346 M_NOWAIT, false); 1347 break; 1348 } 1349 1350 /* 1351 * There are two ways we could keep logs: per-socket or per-ID. If 1352 * we are tracking logs with an ID, then the logs survive the 1353 * destruction of the TCPCB. 1354 * 1355 * If the TCPCB is associated with an ID node, move the logs from the 1356 * TCPCB to the ID node. In theory, this is safe, for reasons which I 1357 * will now explain for my own benefit when I next need to figure out 1358 * this code. :-) 1359 * 1360 * We own the INP lock. Therefore, no one else can change the contents 1361 * of this node (Rule C). Further, no one can remove this node from 1362 * the bucket while we hold the lock (Rule D). Basically, no one can 1363 * mess with this node. That leaves two states in which we could be: 1364 * 1365 * 1. Another thread is currently waiting to acquire the INP lock, with 1366 * plans to do something with this node. When we drop the INP lock, 1367 * they will have a chance to do that. They will recheck the 1368 * tln_closed field (see note to Rule C) and then acquire the 1369 * bucket lock before proceeding further. 1370 * 1371 * 2. Another thread will try to acquire a lock at some point in the 1372 * future. If they try to acquire a lock before we set the 1373 * tln_closed field, they will follow state #1. If they try to 1374 * acquire a lock after we set the tln_closed field, they will be 1375 * able to make changes to the node, at will, following Rule C. 1376 * 1377 * Therefore, we currently own this node and can make any changes 1378 * we want. But, as soon as we set the tln_closed field to true, we 1379 * have effectively dropped our lock on the node. (For this reason, we 1380 * also need to make sure our writes are ordered correctly. An atomic 1381 * operation with "release" semantics should be sufficient.) 1382 */ 1383 1384 if (tp->t_lin != NULL) { 1385 /* Copy the relevant information to the log entry. */ 1386 tln = tp->t_lin; 1387 KASSERT(tln->tln_inp == tp->t_inpcb, 1388 ("%s: Mismatched inp (tln->tln_inp=%p, tp->t_inpcb=%p)", 1389 __func__, tln->tln_inp, tp->t_inpcb)); 1390 tcp_log_move_tp_to_node(tp, tln); 1391 1392 /* Clear information from the PCB. */ 1393 tp->t_lin = NULL; 1394 tp->t_lib = NULL; 1395 1396 /* 1397 * Take a reference on the INP. This ensures that the INP 1398 * remains valid while the node is on the expiry queue. This 1399 * ensures the INP is valid for other threads that may be 1400 * racing to lock this node when we move it to the expire 1401 * queue. 1402 */ 1403 in_pcbref(tp->t_inpcb); 1404 1405 /* 1406 * Store the entry on the expiry list. The exact behavior 1407 * depends on whether we have entries to keep. If so, we 1408 * put the entry at the tail of the list and expire in 1409 * TCP_LOG_EXPIRE_TIME. Otherwise, we expire "now" and put 1410 * the entry at the head of the list. (Handling the cleanup 1411 * via the expiry timer lets us avoid locking messy-ness here.) 1412 */ 1413 tln->tln_expiretime = getsbinuptime(); 1414 TCPLOG_EXPIREQ_LOCK(); 1415 if (tln->tln_count) { 1416 tln->tln_expiretime += TCP_LOG_EXPIRE_TIME; 1417 if (STAILQ_EMPTY(&tcp_log_expireq_head) && 1418 !callout_active(&tcp_log_expireq_callout)) { 1419 /* 1420 * We are adding the first entry and a callout 1421 * is not currently scheduled; therefore, we 1422 * need to schedule one. 1423 */ 1424 callout_reset_sbt(&tcp_log_expireq_callout, 1425 tln->tln_expiretime, SBT_1S, tcp_log_expire, 1426 NULL, C_ABSOLUTE); 1427 } 1428 STAILQ_INSERT_TAIL(&tcp_log_expireq_head, tln, 1429 tln_expireq); 1430 } else { 1431 callouttime = tln->tln_expiretime + 1432 TCP_LOG_EXPIRE_INTVL; 1433 tln_first = STAILQ_FIRST(&tcp_log_expireq_head); 1434 1435 if ((tln_first == NULL || 1436 callouttime < tln_first->tln_expiretime) && 1437 (callout_pending(&tcp_log_expireq_callout) || 1438 !callout_active(&tcp_log_expireq_callout))) { 1439 /* 1440 * The list is empty, or we want to run the 1441 * expire code before the first entry's timer 1442 * fires. Also, we are in a case where a callout 1443 * is not actively running. We want to reset 1444 * the callout to occur sooner. 1445 */ 1446 callout_reset_sbt(&tcp_log_expireq_callout, 1447 callouttime, SBT_1S, tcp_log_expire, NULL, 1448 C_ABSOLUTE); 1449 } 1450 1451 /* 1452 * Insert to the head, or just after the head, as 1453 * appropriate. (This might result in small 1454 * mis-orderings as a bunch of "expire now" entries 1455 * gather at the start of the list, but that should 1456 * not produce big problems, since the expire timer 1457 * will walk through all of them.) 1458 */ 1459 if (tln_first == NULL || 1460 tln->tln_expiretime < tln_first->tln_expiretime) 1461 STAILQ_INSERT_HEAD(&tcp_log_expireq_head, tln, 1462 tln_expireq); 1463 else 1464 STAILQ_INSERT_AFTER(&tcp_log_expireq_head, 1465 tln_first, tln, tln_expireq); 1466 } 1467 TCPLOG_EXPIREQ_UNLOCK(); 1468 1469 /* 1470 * We are done messing with the tln. After this point, we 1471 * can't touch it. (Note that the "release" semantics should 1472 * be included with the TCPLOG_EXPIREQ_UNLOCK() call above. 1473 * Therefore, they should be unnecessary here. However, it 1474 * seems like a good idea to include them anyway, since we 1475 * really are releasing a lock here.) 1476 */ 1477 atomic_store_rel_int(&tln->tln_closed, 1); 1478 } else { 1479 /* Remove log entries. */ 1480 while ((log_entry = STAILQ_FIRST(&tp->t_logs)) != NULL) 1481 tcp_log_remove_log_head(tp, log_entry); 1482 KASSERT(tp->t_lognum == 0, 1483 ("%s: After freeing entries, tp->t_lognum=%d (expected 0)", 1484 __func__, tp->t_lognum)); 1485 } 1486 1487 /* 1488 * Change the log state to off (just in case anything tries to sneak 1489 * in a last-minute log). 1490 */ 1491 tp->t_logstate = TCP_LOG_STATE_OFF; 1492} 1493 1494static void 1495tcp_log_purge_tp_logbuf(struct tcpcb *tp) 1496{ 1497 struct tcp_log_mem *log_entry; 1498 struct inpcb *inp; 1499 1500 inp = tp->t_inpcb; 1501 INP_WLOCK_ASSERT(inp); 1502 if (tp->t_lognum == 0) 1503 return; 1504 1505 while ((log_entry = STAILQ_FIRST(&tp->t_logs)) != NULL) 1506 tcp_log_remove_log_head(tp, log_entry); 1507 KASSERT(tp->t_lognum == 0, 1508 ("%s: After freeing entries, tp->t_lognum=%d (expected 0)", 1509 __func__, tp->t_lognum)); 1510 tp->t_logstate = TCP_LOG_STATE_OFF; 1511} 1512 1513/* 1514 * This logs an event for a TCP socket. Normally, this is called via 1515 * TCP_LOG_EVENT or TCP_LOG_EVENT_VERBOSE. See the documentation for 1516 * TCP_LOG_EVENT(). 1517 */ 1518 1519struct tcp_log_buffer * 1520tcp_log_event_(struct tcpcb *tp, struct tcphdr *th, struct sockbuf *rxbuf, 1521 struct sockbuf *txbuf, uint8_t eventid, int errornum, uint32_t len, 1522 union tcp_log_stackspecific *stackinfo, int th_hostorder, 1523 const char *output_caller, const char *func, int line, const struct timeval *itv) 1524{ 1525 struct tcp_log_mem *log_entry; 1526 struct tcp_log_buffer *log_buf; 1527 int attempt_count = 0; 1528 struct tcp_log_verbose *log_verbose; 1529 uint32_t logsn; 1530 1531 KASSERT((func == NULL && line == 0) || (func != NULL && line > 0), 1532 ("%s called with inconsistent func (%p) and line (%d) arguments", 1533 __func__, func, line)); 1534 1535 INP_WLOCK_ASSERT(tp->t_inpcb); 1536 if (tcp_disable_all_bb_logs) { 1537 /* 1538 * The global shutdown logging 1539 * switch has been thrown. Call 1540 * the purge function that frees 1541 * purges out the logs and 1542 * turns off logging. 1543 */ 1544 tcp_log_purge_tp_logbuf(tp); 1545 return (NULL); 1546 } 1547 KASSERT(tp->t_logstate == TCP_LOG_STATE_HEAD || 1548 tp->t_logstate == TCP_LOG_STATE_TAIL || 1549 tp->t_logstate == TCP_LOG_STATE_CONTINUAL || 1550 tp->t_logstate == TCP_LOG_STATE_HEAD_AUTO || 1551 tp->t_logstate == TCP_LOG_STATE_TAIL_AUTO, 1552 ("%s called with unexpected tp->t_logstate (%d)", __func__, 1553 tp->t_logstate)); 1554 1555 /* 1556 * Get the serial number. We do this early so it will 1557 * increment even if we end up skipping the log entry for some 1558 * reason. 1559 */ 1560 logsn = tp->t_logsn++; 1561 1562 /* 1563 * Can we get a new log entry? If so, increment the lognum counter 1564 * here. 1565 */ 1566retry: 1567 if (tp->t_lognum < tp->t_loglimit) { 1568 if ((log_entry = uma_zalloc(tcp_log_zone, M_NOWAIT)) != NULL) 1569 tp->t_lognum++; 1570 } else 1571 log_entry = NULL; 1572 1573 /* Do we need to try to reuse? */ 1574 if (log_entry == NULL) { 1575 /* 1576 * Sacrifice auto-logged sessions without a log ID if 1577 * tcp_log_auto_all is false. (If they don't have a log 1578 * ID by now, it is probable that either they won't get one 1579 * or we are resource-constrained.) 1580 */ 1581 if (tp->t_lib == NULL && (tp->t_flags2 & TF2_LOG_AUTO) && 1582 !tcp_log_auto_all) { 1583 if (tcp_log_state_change(tp, TCP_LOG_STATE_CLEAR)) { 1584#ifdef INVARIANTS 1585 panic("%s:%d: tcp_log_state_change() failed " 1586 "to set tp %p to TCP_LOG_STATE_CLEAR", 1587 __func__, __LINE__, tp); 1588#endif 1589 tp->t_logstate = TCP_LOG_STATE_OFF; 1590 } 1591 return (NULL); 1592 } 1593 /* 1594 * If we are in TCP_LOG_STATE_HEAD_AUTO state, try to dump 1595 * the buffers. If successful, deactivate tracing. Otherwise, 1596 * leave it active so we will retry. 1597 */ 1598 if (tp->t_logstate == TCP_LOG_STATE_HEAD_AUTO && 1599 !tcp_log_dump_tp_logbuf(tp, "auto-dumped from head", 1600 M_NOWAIT, false)) { 1601 tp->t_logstate = TCP_LOG_STATE_OFF; 1602 return(NULL); 1603 } else if ((tp->t_logstate == TCP_LOG_STATE_CONTINUAL) && 1604 !tcp_log_dump_tp_logbuf(tp, "auto-dumped from continual", 1605 M_NOWAIT, false)) { 1606 if (attempt_count == 0) { 1607 attempt_count++; 1608 goto retry; 1609 } 1610#ifdef TCPLOG_DEBUG_COUNTERS 1611 counter_u64_add(tcp_log_que_fail4, 1); 1612#endif 1613 return(NULL); 1614 } else if (tp->t_logstate == TCP_LOG_STATE_HEAD_AUTO) 1615 return(NULL); 1616 1617 /* If in HEAD state, just deactivate the tracing and return. */ 1618 if (tp->t_logstate == TCP_LOG_STATE_HEAD) { 1619 tp->t_logstate = TCP_LOG_STATE_OFF; 1620 return(NULL); 1621 } 1622 1623 /* 1624 * Get a buffer to reuse. If that fails, just give up. 1625 * (We can't log anything without a buffer in which to 1626 * put it.) 1627 * 1628 * Note that we don't change the t_lognum counter 1629 * here. Because we are re-using the buffer, the total 1630 * number won't change. 1631 */ 1632 if ((log_entry = STAILQ_FIRST(&tp->t_logs)) == NULL) 1633 return(NULL); 1634 STAILQ_REMOVE_HEAD(&tp->t_logs, tlm_queue); 1635 tcp_log_entry_refcnt_rem(log_entry); 1636 } 1637 1638 KASSERT(log_entry != NULL, 1639 ("%s: log_entry unexpectedly NULL", __func__)); 1640 1641 /* Extract the log buffer and verbose buffer pointers. */ 1642 log_buf = &log_entry->tlm_buf; 1643 log_verbose = &log_entry->tlm_v; 1644 1645 /* Basic entries. */ 1646 if (itv == NULL) 1647 getmicrouptime(&log_buf->tlb_tv); 1648 else 1649 memcpy(&log_buf->tlb_tv, itv, sizeof(struct timeval)); 1650 log_buf->tlb_ticks = ticks; 1651 log_buf->tlb_sn = logsn; 1652 log_buf->tlb_stackid = tp->t_fb->tfb_id; 1653 log_buf->tlb_eventid = eventid; 1654 log_buf->tlb_eventflags = 0; 1655 log_buf->tlb_errno = errornum; 1656 1657 /* Socket buffers */ 1658 if (rxbuf != NULL) { 1659 log_buf->tlb_eventflags |= TLB_FLAG_RXBUF; 1660 log_buf->tlb_rxbuf.tls_sb_acc = rxbuf->sb_acc; 1661 log_buf->tlb_rxbuf.tls_sb_ccc = rxbuf->sb_ccc; 1662 log_buf->tlb_rxbuf.tls_sb_spare = 0; 1663 } 1664 if (txbuf != NULL) { 1665 log_buf->tlb_eventflags |= TLB_FLAG_TXBUF; 1666 log_buf->tlb_txbuf.tls_sb_acc = txbuf->sb_acc; 1667 log_buf->tlb_txbuf.tls_sb_ccc = txbuf->sb_ccc; 1668 log_buf->tlb_txbuf.tls_sb_spare = 0; 1669 } 1670 /* Copy values from tp to the log entry. */ 1671#define COPY_STAT(f) log_buf->tlb_ ## f = tp->f 1672#define COPY_STAT_T(f) log_buf->tlb_ ## f = tp->t_ ## f 1673 COPY_STAT_T(state); 1674 COPY_STAT_T(starttime); 1675 COPY_STAT(iss); 1676 COPY_STAT_T(flags); 1677 COPY_STAT(snd_una); 1678 COPY_STAT(snd_max); 1679 COPY_STAT(snd_cwnd); 1680 COPY_STAT(snd_nxt); 1681 COPY_STAT(snd_recover); 1682 COPY_STAT(snd_wnd); 1683 COPY_STAT(snd_ssthresh); 1684 COPY_STAT_T(srtt); 1685 COPY_STAT_T(rttvar); 1686 COPY_STAT(rcv_up); 1687 COPY_STAT(rcv_adv); 1688 COPY_STAT(rcv_nxt); 1689 COPY_STAT(rcv_wnd); 1690 COPY_STAT_T(dupacks); 1691 COPY_STAT_T(segqlen); 1692 COPY_STAT(snd_numholes); 1693 COPY_STAT(snd_scale); 1694 COPY_STAT(rcv_scale); 1695 COPY_STAT_T(flags2); 1696 COPY_STAT_T(fbyte_in); 1697 COPY_STAT_T(fbyte_out); 1698#undef COPY_STAT 1699#undef COPY_STAT_T 1700 log_buf->tlb_flex1 = 0; 1701 log_buf->tlb_flex2 = 0; 1702 /* Copy stack-specific info. */ 1703 if (stackinfo != NULL) { 1704 memcpy(&log_buf->tlb_stackinfo, stackinfo, 1705 sizeof(log_buf->tlb_stackinfo)); 1706 log_buf->tlb_eventflags |= TLB_FLAG_STACKINFO; 1707 } 1708 1709 /* The packet */ 1710 log_buf->tlb_len = len; 1711 if (th) { 1712 int optlen; 1713 1714 log_buf->tlb_eventflags |= TLB_FLAG_HDR; 1715 log_buf->tlb_th = *th; 1716 if (th_hostorder) 1717 tcp_fields_to_net(&log_buf->tlb_th); 1718 optlen = (th->th_off << 2) - sizeof (struct tcphdr); 1719 if (optlen > 0) 1720 memcpy(log_buf->tlb_opts, th + 1, optlen); 1721 } 1722 1723 /* Verbose information */ 1724 if (func != NULL) { 1725 log_buf->tlb_eventflags |= TLB_FLAG_VERBOSE; 1726 if (output_caller != NULL) 1727 strlcpy(log_verbose->tlv_snd_frm, output_caller, 1728 TCP_FUNC_LEN); 1729 else 1730 *log_verbose->tlv_snd_frm = 0; 1731 strlcpy(log_verbose->tlv_trace_func, func, TCP_FUNC_LEN); 1732 log_verbose->tlv_trace_line = line; 1733 } 1734 1735 /* Insert the new log at the tail. */ 1736 STAILQ_INSERT_TAIL(&tp->t_logs, log_entry, tlm_queue); 1737 tcp_log_entry_refcnt_add(log_entry); 1738 return (log_buf); 1739} 1740 1741/* 1742 * Change the logging state for a TCPCB. Returns 0 on success or an 1743 * error code on failure. 1744 */ 1745int 1746tcp_log_state_change(struct tcpcb *tp, int state) 1747{ 1748 struct tcp_log_mem *log_entry; 1749 1750 INP_WLOCK_ASSERT(tp->t_inpcb); 1751 switch(state) { 1752 case TCP_LOG_STATE_CLEAR: 1753 while ((log_entry = STAILQ_FIRST(&tp->t_logs)) != NULL) 1754 tcp_log_remove_log_head(tp, log_entry); 1755 /* Fall through */ 1756 1757 case TCP_LOG_STATE_OFF: 1758 tp->t_logstate = TCP_LOG_STATE_OFF; 1759 break; 1760 1761 case TCP_LOG_STATE_TAIL: 1762 case TCP_LOG_STATE_HEAD: 1763 case TCP_LOG_STATE_CONTINUAL: 1764 case TCP_LOG_STATE_HEAD_AUTO: 1765 case TCP_LOG_STATE_TAIL_AUTO: 1766 tp->t_logstate = state; 1767 break; 1768 1769 default: 1770 return (EINVAL); 1771 } 1772 if (tcp_disable_all_bb_logs) { 1773 /* We are prohibited from doing any logs */ 1774 tp->t_logstate = TCP_LOG_STATE_OFF; 1775 } 1776 tp->t_flags2 &= ~(TF2_LOG_AUTO); 1777 1778 return (0); 1779} 1780 1781/* If tcp_drain() is called, flush half the log entries. */ 1782void 1783tcp_log_drain(struct tcpcb *tp) 1784{ 1785 struct tcp_log_mem *log_entry, *next; 1786 int target, skip; 1787 1788 INP_WLOCK_ASSERT(tp->t_inpcb); 1789 if ((target = tp->t_lognum / 2) == 0) 1790 return; 1791 1792 /* 1793 * If we are logging the "head" packets, we want to discard 1794 * from the tail of the queue. Otherwise, we want to discard 1795 * from the head. 1796 */ 1797 if (tp->t_logstate == TCP_LOG_STATE_HEAD || 1798 tp->t_logstate == TCP_LOG_STATE_HEAD_AUTO) { 1799 skip = tp->t_lognum - target; 1800 STAILQ_FOREACH(log_entry, &tp->t_logs, tlm_queue) 1801 if (!--skip) 1802 break; 1803 KASSERT(log_entry != NULL, 1804 ("%s: skipped through all entries!", __func__)); 1805 if (log_entry == NULL) 1806 return; 1807 while ((next = STAILQ_NEXT(log_entry, tlm_queue)) != NULL) { 1808 STAILQ_REMOVE_AFTER(&tp->t_logs, log_entry, tlm_queue); 1809 tcp_log_entry_refcnt_rem(next); 1810 tcp_log_remove_log_cleanup(tp, next); 1811#ifdef INVARIANTS 1812 target--; 1813#endif 1814 } 1815 KASSERT(target == 0, 1816 ("%s: After removing from tail, target was %d", __func__, 1817 target)); 1818 } else if (tp->t_logstate == TCP_LOG_STATE_CONTINUAL) { 1819 (void)tcp_log_dump_tp_logbuf(tp, "auto-dumped from continual", 1820 M_NOWAIT, false); 1821 } else { 1822 while ((log_entry = STAILQ_FIRST(&tp->t_logs)) != NULL && 1823 target--) 1824 tcp_log_remove_log_head(tp, log_entry); 1825 KASSERT(target <= 0, 1826 ("%s: After removing from head, target was %d", __func__, 1827 target)); 1828 KASSERT(tp->t_lognum > 0, 1829 ("%s: After removing from head, tp->t_lognum was %d", 1830 __func__, target)); 1831 KASSERT(log_entry != NULL, 1832 ("%s: After removing from head, the tailq was empty", 1833 __func__)); 1834 } 1835} 1836 1837static inline int 1838tcp_log_copyout(struct sockopt *sopt, void *src, void *dst, size_t len) 1839{ 1840 1841 if (sopt->sopt_td != NULL) 1842 return (copyout(src, dst, len)); 1843 bcopy(src, dst, len); 1844 return (0); 1845} 1846 1847static int 1848tcp_log_logs_to_buf(struct sockopt *sopt, struct tcp_log_stailq *log_tailqp, 1849 struct tcp_log_buffer **end, int count) 1850{ 1851 struct tcp_log_buffer *out_entry; 1852 struct tcp_log_mem *log_entry; 1853 size_t entrysize; 1854 int error; 1855#ifdef INVARIANTS 1856 int orig_count = count; 1857#endif 1858 1859 /* Copy the data out. */ 1860 error = 0; 1861 out_entry = (struct tcp_log_buffer *) sopt->sopt_val; 1862 STAILQ_FOREACH(log_entry, log_tailqp, tlm_queue) { 1863 count--; 1864 KASSERT(count >= 0, 1865 ("%s:%d: Exceeded expected count (%d) processing list %p", 1866 __func__, __LINE__, orig_count, log_tailqp)); 1867 1868#ifdef TCPLOG_DEBUG_COUNTERS 1869 counter_u64_add(tcp_log_que_copyout, 1); 1870#endif 1871 1872 /* 1873 * Skip copying out the header if it isn't present. 1874 * Instead, copy out zeros (to ensure we don't leak info). 1875 * TODO: Make sure we truly do zero everything we don't 1876 * explicitly set. 1877 */ 1878 if (log_entry->tlm_buf.tlb_eventflags & TLB_FLAG_HDR) 1879 entrysize = sizeof(struct tcp_log_buffer); 1880 else 1881 entrysize = offsetof(struct tcp_log_buffer, tlb_th); 1882 error = tcp_log_copyout(sopt, &log_entry->tlm_buf, out_entry, 1883 entrysize); 1884 if (error) 1885 break; 1886 if (!(log_entry->tlm_buf.tlb_eventflags & TLB_FLAG_HDR)) { 1887 error = tcp_log_copyout(sopt, zerobuf, 1888 ((uint8_t *)out_entry) + entrysize, 1889 sizeof(struct tcp_log_buffer) - entrysize); 1890 } 1891 1892 /* 1893 * Copy out the verbose bit, if needed. Either way, 1894 * increment the output pointer the correct amount. 1895 */ 1896 if (log_entry->tlm_buf.tlb_eventflags & TLB_FLAG_VERBOSE) { 1897 error = tcp_log_copyout(sopt, &log_entry->tlm_v, 1898 out_entry->tlb_verbose, 1899 sizeof(struct tcp_log_verbose)); 1900 if (error) 1901 break; 1902 out_entry = (struct tcp_log_buffer *) 1903 (((uint8_t *) (out_entry + 1)) + 1904 sizeof(struct tcp_log_verbose)); 1905 } else 1906 out_entry++; 1907 } 1908 *end = out_entry; 1909 KASSERT(error || count == 0, 1910 ("%s:%d: Less than expected count (%d) processing list %p" 1911 " (%d remain)", __func__, __LINE__, orig_count, 1912 log_tailqp, count)); 1913 1914 return (error); 1915} 1916 1917/* 1918 * Copy out the buffer. Note that we do incremental copying, so 1919 * sooptcopyout() won't work. However, the goal is to produce the same 1920 * end result as if we copied in the entire user buffer, updated it, 1921 * and then used sooptcopyout() to copy it out. 1922 * 1923 * NOTE: This should be called with a write lock on the PCB; however, 1924 * the function will drop it after it extracts the data from the TCPCB. 1925 */ 1926int 1927tcp_log_getlogbuf(struct sockopt *sopt, struct tcpcb *tp) 1928{ 1929 struct tcp_log_stailq log_tailq; 1930 struct tcp_log_mem *log_entry, *log_next; 1931 struct tcp_log_buffer *out_entry; 1932 struct inpcb *inp; 1933 size_t outsize, entrysize; 1934 int error, outnum; 1935 1936 INP_WLOCK_ASSERT(tp->t_inpcb); 1937 inp = tp->t_inpcb; 1938 1939 /* 1940 * Determine which log entries will fit in the buffer. As an 1941 * optimization, skip this if all the entries will clearly fit 1942 * in the buffer. (However, get an exact size if we are using 1943 * INVARIANTS.) 1944 */ 1945#ifndef INVARIANTS 1946 if (sopt->sopt_valsize / (sizeof(struct tcp_log_buffer) + 1947 sizeof(struct tcp_log_verbose)) >= tp->t_lognum) { 1948 log_entry = STAILQ_LAST(&tp->t_logs, tcp_log_mem, tlm_queue); 1949 log_next = NULL; 1950 outsize = 0; 1951 outnum = tp->t_lognum; 1952 } else { 1953#endif 1954 outsize = outnum = 0; 1955 log_entry = NULL; 1956 STAILQ_FOREACH(log_next, &tp->t_logs, tlm_queue) { 1957 entrysize = sizeof(struct tcp_log_buffer); 1958 if (log_next->tlm_buf.tlb_eventflags & 1959 TLB_FLAG_VERBOSE) 1960 entrysize += sizeof(struct tcp_log_verbose); 1961 if ((sopt->sopt_valsize - outsize) < entrysize) 1962 break; 1963 outsize += entrysize; 1964 outnum++; 1965 log_entry = log_next; 1966 } 1967 KASSERT(outsize <= sopt->sopt_valsize, 1968 ("%s: calculated output size (%zu) greater than available" 1969 "space (%zu)", __func__, outsize, sopt->sopt_valsize)); 1970#ifndef INVARIANTS 1971 } 1972#endif 1973 1974 /* 1975 * Copy traditional sooptcopyout() behavior: if sopt->sopt_val 1976 * is NULL, silently skip the copy. However, in this case, we 1977 * will leave the list alone and return. Functionally, this 1978 * gives userspace a way to poll for an approximate buffer 1979 * size they will need to get the log entries. 1980 */ 1981 if (sopt->sopt_val == NULL) { 1982 INP_WUNLOCK(inp); 1983 if (outsize == 0) { 1984 outsize = outnum * (sizeof(struct tcp_log_buffer) + 1985 sizeof(struct tcp_log_verbose)); 1986 } 1987 if (sopt->sopt_valsize > outsize) 1988 sopt->sopt_valsize = outsize; 1989 return (0); 1990 } 1991 1992 /* 1993 * Break apart the list. We'll save the ones we want to copy 1994 * out locally and remove them from the TCPCB list. We can 1995 * then drop the INPCB lock while we do the copyout. 1996 * 1997 * There are roughly three cases: 1998 * 1. There was nothing to copy out. That's easy: drop the 1999 * lock and return. 2000 * 2. We are copying out the entire list. Again, that's easy: 2001 * move the whole list. 2002 * 3. We are copying out a partial list. That's harder. We 2003 * need to update the list book-keeping entries. 2004 */ 2005 if (log_entry != NULL && log_next == NULL) { 2006 /* Move entire list. */ 2007 KASSERT(outnum == tp->t_lognum, 2008 ("%s:%d: outnum (%d) should match tp->t_lognum (%d)", 2009 __func__, __LINE__, outnum, tp->t_lognum)); 2010 log_tailq = tp->t_logs; 2011 tp->t_lognum = 0; 2012 STAILQ_INIT(&tp->t_logs); 2013 } else if (log_entry != NULL) { 2014 /* Move partial list. */ 2015 KASSERT(outnum < tp->t_lognum, 2016 ("%s:%d: outnum (%d) not less than tp->t_lognum (%d)", 2017 __func__, __LINE__, outnum, tp->t_lognum)); 2018 STAILQ_FIRST(&log_tailq) = STAILQ_FIRST(&tp->t_logs); 2019 STAILQ_FIRST(&tp->t_logs) = STAILQ_NEXT(log_entry, tlm_queue); 2020 KASSERT(STAILQ_NEXT(log_entry, tlm_queue) != NULL, 2021 ("%s:%d: tp->t_logs is unexpectedly shorter than expected" 2022 "(tp: %p, log_tailq: %p, outnum: %d, tp->t_lognum: %d)", 2023 __func__, __LINE__, tp, &log_tailq, outnum, tp->t_lognum)); 2024 STAILQ_NEXT(log_entry, tlm_queue) = NULL; 2025 log_tailq.stqh_last = &STAILQ_NEXT(log_entry, tlm_queue); 2026 tp->t_lognum -= outnum; 2027 } else 2028 STAILQ_INIT(&log_tailq); 2029 2030 /* Drop the PCB lock. */ 2031 INP_WUNLOCK(inp); 2032 2033 /* Copy the data out. */ 2034 error = tcp_log_logs_to_buf(sopt, &log_tailq, &out_entry, outnum); 2035 2036 if (error) { 2037 /* Restore list */ 2038 INP_WLOCK(inp); 2039 if ((inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) == 0) { 2040 tp = intotcpcb(inp); 2041 2042 /* Merge the two lists. */ 2043 STAILQ_CONCAT(&log_tailq, &tp->t_logs); 2044 tp->t_logs = log_tailq; 2045 tp->t_lognum += outnum; 2046 } 2047 INP_WUNLOCK(inp); 2048 } else { 2049 /* Sanity check entries */ 2050 KASSERT(((caddr_t)out_entry - (caddr_t)sopt->sopt_val) == 2051 outsize, ("%s: Actual output size (%zu) != " 2052 "calculated output size (%zu)", __func__, 2053 (size_t)((caddr_t)out_entry - (caddr_t)sopt->sopt_val), 2054 outsize)); 2055 2056 /* Free the entries we just copied out. */ 2057 STAILQ_FOREACH_SAFE(log_entry, &log_tailq, tlm_queue, log_next) { 2058 tcp_log_entry_refcnt_rem(log_entry); 2059 uma_zfree(tcp_log_zone, log_entry); 2060 } 2061 } 2062 2063 sopt->sopt_valsize = (size_t)((caddr_t)out_entry - 2064 (caddr_t)sopt->sopt_val); 2065 return (error); 2066} 2067 2068static void 2069tcp_log_free_queue(struct tcp_log_dev_queue *param) 2070{ 2071 struct tcp_log_dev_log_queue *entry; 2072 2073 KASSERT(param != NULL, ("%s: called with NULL param", __func__)); 2074 if (param == NULL) 2075 return; 2076 2077 entry = (struct tcp_log_dev_log_queue *)param; 2078 2079 /* Free the entries. */ 2080 tcp_log_free_entries(&entry->tldl_entries, &entry->tldl_count); 2081 2082 /* Free the buffer, if it is allocated. */ 2083 if (entry->tldl_common.tldq_buf != NULL) 2084 free(entry->tldl_common.tldq_buf, M_TCPLOGDEV); 2085 2086 /* Free the queue entry. */ 2087 free(entry, M_TCPLOGDEV); 2088} 2089 2090static struct tcp_log_common_header * 2091tcp_log_expandlogbuf(struct tcp_log_dev_queue *param) 2092{ 2093 struct tcp_log_dev_log_queue *entry; 2094 struct tcp_log_header *hdr; 2095 uint8_t *end; 2096 struct sockopt sopt; 2097 int error; 2098 2099 entry = (struct tcp_log_dev_log_queue *)param; 2100 2101 /* Take a worst-case guess at space needs. */ 2102 sopt.sopt_valsize = sizeof(struct tcp_log_header) + 2103 entry->tldl_count * (sizeof(struct tcp_log_buffer) + 2104 sizeof(struct tcp_log_verbose)); 2105 hdr = malloc(sopt.sopt_valsize, M_TCPLOGDEV, M_NOWAIT); 2106 if (hdr == NULL) { 2107#ifdef TCPLOG_DEBUG_COUNTERS 2108 counter_u64_add(tcp_log_que_fail5, entry->tldl_count); 2109#endif 2110 return (NULL); 2111 } 2112 sopt.sopt_val = hdr + 1; 2113 sopt.sopt_valsize -= sizeof(struct tcp_log_header); 2114 sopt.sopt_td = NULL; 2115 2116 error = tcp_log_logs_to_buf(&sopt, &entry->tldl_entries, 2117 (struct tcp_log_buffer **)&end, entry->tldl_count); 2118 if (error) { 2119 free(hdr, M_TCPLOGDEV); 2120 return (NULL); 2121 } 2122 2123 /* Free the entries. */ 2124 tcp_log_free_entries(&entry->tldl_entries, &entry->tldl_count); 2125 entry->tldl_count = 0; 2126 2127 memset(hdr, 0, sizeof(struct tcp_log_header)); 2128 hdr->tlh_version = TCP_LOG_BUF_VER; 2129 hdr->tlh_type = TCP_LOG_DEV_TYPE_BBR; 2130 hdr->tlh_length = end - (uint8_t *)hdr; 2131 hdr->tlh_ie = entry->tldl_ie; 2132 hdr->tlh_af = entry->tldl_af; 2133 getboottime(&hdr->tlh_offset); 2134 strlcpy(hdr->tlh_id, entry->tldl_id, TCP_LOG_ID_LEN); 2135 strlcpy(hdr->tlh_tag, entry->tldl_tag, TCP_LOG_TAG_LEN); 2136 strlcpy(hdr->tlh_reason, entry->tldl_reason, TCP_LOG_REASON_LEN); 2137 return ((struct tcp_log_common_header *)hdr); 2138} 2139 2140/* 2141 * Queue the tcpcb's log buffer for transmission via the log buffer facility. 2142 * 2143 * NOTE: This should be called with a write lock on the PCB. 2144 * 2145 * how should be M_WAITOK or M_NOWAIT. If M_WAITOK, the function will drop 2146 * and reacquire the INP lock if it needs to do so. 2147 * 2148 * If force is false, this will only dump auto-logged sessions if 2149 * tcp_log_auto_all is true or if there is a log ID defined for the session. 2150 */ 2151int 2152tcp_log_dump_tp_logbuf(struct tcpcb *tp, char *reason, int how, bool force) 2153{ 2154 struct tcp_log_dev_log_queue *entry; 2155 struct inpcb *inp; 2156#ifdef TCPLOG_DEBUG_COUNTERS 2157 int num_entries; 2158#endif 2159 2160 inp = tp->t_inpcb; 2161 INP_WLOCK_ASSERT(inp); 2162 2163 /* If there are no log entries, there is nothing to do. */ 2164 if (tp->t_lognum == 0) 2165 return (0); 2166 2167 /* Check for a log ID. */ 2168 if (tp->t_lib == NULL && (tp->t_flags2 & TF2_LOG_AUTO) && 2169 !tcp_log_auto_all && !force) { 2170 struct tcp_log_mem *log_entry; 2171 2172 /* 2173 * We needed a log ID and none was found. Free the log entries 2174 * and return success. Also, cancel further logging. If the 2175 * session doesn't have a log ID by now, we'll assume it isn't 2176 * going to get one. 2177 */ 2178 while ((log_entry = STAILQ_FIRST(&tp->t_logs)) != NULL) 2179 tcp_log_remove_log_head(tp, log_entry); 2180 KASSERT(tp->t_lognum == 0, 2181 ("%s: After freeing entries, tp->t_lognum=%d (expected 0)", 2182 __func__, tp->t_lognum)); 2183 tp->t_logstate = TCP_LOG_STATE_OFF; 2184 return (0); 2185 } 2186 2187 /* 2188 * Allocate memory. If we must wait, we'll need to drop the locks 2189 * and reacquire them (and do all the related business that goes 2190 * along with that). 2191 */ 2192 entry = malloc(sizeof(struct tcp_log_dev_log_queue), M_TCPLOGDEV, 2193 M_NOWAIT); 2194 if (entry == NULL && (how & M_NOWAIT)) { 2195#ifdef TCPLOG_DEBUG_COUNTERS 2196 counter_u64_add(tcp_log_que_fail3, 1); 2197#endif 2198 return (ENOBUFS); 2199 } 2200 if (entry == NULL) { 2201 INP_WUNLOCK(inp); 2202 entry = malloc(sizeof(struct tcp_log_dev_log_queue), 2203 M_TCPLOGDEV, M_WAITOK); 2204 INP_WLOCK(inp); 2205 /* 2206 * Note that this check is slightly overly-restrictive in 2207 * that the TCB can survive either of these events. 2208 * However, there is currently not a good way to ensure 2209 * that is the case. So, if we hit this M_WAIT path, we 2210 * may end up dropping some entries. That seems like a 2211 * small price to pay for safety. 2212 */ 2213 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 2214 free(entry, M_TCPLOGDEV); 2215#ifdef TCPLOG_DEBUG_COUNTERS 2216 counter_u64_add(tcp_log_que_fail2, 1); 2217#endif 2218 return (ECONNRESET); 2219 } 2220 tp = intotcpcb(inp); 2221 if (tp->t_lognum == 0) { 2222 free(entry, M_TCPLOGDEV); 2223 return (0); 2224 } 2225 } 2226 2227 /* Fill in the unique parts of the queue entry. */ 2228 if (tp->t_lib != NULL) { 2229 strlcpy(entry->tldl_id, tp->t_lib->tlb_id, TCP_LOG_ID_LEN); 2230 strlcpy(entry->tldl_tag, tp->t_lib->tlb_tag, TCP_LOG_TAG_LEN); 2231 } else { 2232 strlcpy(entry->tldl_id, "UNKNOWN", TCP_LOG_ID_LEN); 2233 strlcpy(entry->tldl_tag, "UNKNOWN", TCP_LOG_TAG_LEN); 2234 } 2235 if (reason != NULL) 2236 strlcpy(entry->tldl_reason, reason, TCP_LOG_REASON_LEN); 2237 else 2238 strlcpy(entry->tldl_reason, "UNKNOWN", TCP_LOG_ID_LEN); 2239 entry->tldl_ie = inp->inp_inc.inc_ie; 2240 if (inp->inp_inc.inc_flags & INC_ISIPV6) 2241 entry->tldl_af = AF_INET6; 2242 else 2243 entry->tldl_af = AF_INET; 2244 entry->tldl_entries = tp->t_logs; 2245 entry->tldl_count = tp->t_lognum; 2246 2247 /* Fill in the common parts of the queue entry. */ 2248 entry->tldl_common.tldq_buf = NULL; 2249 entry->tldl_common.tldq_xform = tcp_log_expandlogbuf; 2250 entry->tldl_common.tldq_dtor = tcp_log_free_queue; 2251 2252 /* Clear the log data from the TCPCB. */ 2253#ifdef TCPLOG_DEBUG_COUNTERS 2254 num_entries = tp->t_lognum; 2255#endif 2256 tp->t_lognum = 0; 2257 STAILQ_INIT(&tp->t_logs); 2258 2259 /* Add the entry. If no one is listening, free the entry. */ 2260 if (tcp_log_dev_add_log((struct tcp_log_dev_queue *)entry)) { 2261 tcp_log_free_queue((struct tcp_log_dev_queue *)entry); 2262#ifdef TCPLOG_DEBUG_COUNTERS 2263 counter_u64_add(tcp_log_que_fail1, num_entries); 2264 } else { 2265 counter_u64_add(tcp_log_queued, num_entries); 2266#endif 2267 } 2268 return (0); 2269} 2270 2271/* 2272 * Queue the log_id_node's log buffers for transmission via the log buffer 2273 * facility. 2274 * 2275 * NOTE: This should be called with the bucket locked and referenced. 2276 * 2277 * how should be M_WAITOK or M_NOWAIT. If M_WAITOK, the function will drop 2278 * and reacquire the bucket lock if it needs to do so. (The caller must 2279 * ensure that the tln is no longer on any lists so no one else will mess 2280 * with this while the lock is dropped!) 2281 */ 2282static int 2283tcp_log_dump_node_logbuf(struct tcp_log_id_node *tln, char *reason, int how) 2284{ 2285 struct tcp_log_dev_log_queue *entry; 2286 struct tcp_log_id_bucket *tlb; 2287 2288 tlb = tln->tln_bucket; 2289 TCPID_BUCKET_LOCK_ASSERT(tlb); 2290 KASSERT(tlb->tlb_refcnt > 0, 2291 ("%s:%d: Called with unreferenced bucket (tln=%p, tlb=%p)", 2292 __func__, __LINE__, tln, tlb)); 2293 KASSERT(tln->tln_closed, 2294 ("%s:%d: Called for node with tln_closed==false (tln=%p)", 2295 __func__, __LINE__, tln)); 2296 2297 /* If there are no log entries, there is nothing to do. */ 2298 if (tln->tln_count == 0) 2299 return (0); 2300 2301 /* 2302 * Allocate memory. If we must wait, we'll need to drop the locks 2303 * and reacquire them (and do all the related business that goes 2304 * along with that). 2305 */ 2306 entry = malloc(sizeof(struct tcp_log_dev_log_queue), M_TCPLOGDEV, 2307 M_NOWAIT); 2308 if (entry == NULL && (how & M_NOWAIT)) 2309 return (ENOBUFS); 2310 if (entry == NULL) { 2311 TCPID_BUCKET_UNLOCK(tlb); 2312 entry = malloc(sizeof(struct tcp_log_dev_log_queue), 2313 M_TCPLOGDEV, M_WAITOK); 2314 TCPID_BUCKET_LOCK(tlb); 2315 } 2316 2317 /* Fill in the common parts of the queue entry.. */ 2318 entry->tldl_common.tldq_buf = NULL; 2319 entry->tldl_common.tldq_xform = tcp_log_expandlogbuf; 2320 entry->tldl_common.tldq_dtor = tcp_log_free_queue; 2321 2322 /* Fill in the unique parts of the queue entry. */ 2323 strlcpy(entry->tldl_id, tlb->tlb_id, TCP_LOG_ID_LEN); 2324 strlcpy(entry->tldl_tag, tlb->tlb_tag, TCP_LOG_TAG_LEN); 2325 if (reason != NULL) 2326 strlcpy(entry->tldl_reason, reason, TCP_LOG_REASON_LEN); 2327 else 2328 strlcpy(entry->tldl_reason, "UNKNOWN", TCP_LOG_ID_LEN); 2329 entry->tldl_ie = tln->tln_ie; 2330 entry->tldl_entries = tln->tln_entries; 2331 entry->tldl_count = tln->tln_count; 2332 entry->tldl_af = tln->tln_af; 2333 2334 /* Add the entry. If no one is listening, free the entry. */ 2335 if (tcp_log_dev_add_log((struct tcp_log_dev_queue *)entry)) 2336 tcp_log_free_queue((struct tcp_log_dev_queue *)entry); 2337 2338 return (0); 2339} 2340 2341/* 2342 * Queue the log buffers for all sessions in a bucket for transmissions via 2343 * the log buffer facility. 2344 * 2345 * NOTE: This should be called with a locked bucket; however, the function 2346 * will drop the lock. 2347 */ 2348#define LOCAL_SAVE 10 2349static void 2350tcp_log_dumpbucketlogs(struct tcp_log_id_bucket *tlb, char *reason) 2351{ 2352 struct tcp_log_id_node local_entries[LOCAL_SAVE]; 2353 struct inpcb *inp; 2354 struct tcpcb *tp; 2355 struct tcp_log_id_node *cur_tln, *prev_tln, *tmp_tln; 2356 int i, num_local_entries, tree_locked; 2357 bool expireq_locked; 2358 2359 TCPID_BUCKET_LOCK_ASSERT(tlb); 2360 2361 /* 2362 * Take a reference on the bucket to keep it from disappearing until 2363 * we are done. 2364 */ 2365 TCPID_BUCKET_REF(tlb); 2366 2367 /* 2368 * We'll try to create these without dropping locks. However, we 2369 * might very well need to drop locks to get memory. If that's the 2370 * case, we'll save up to 10 on the stack, and sacrifice the rest. 2371 * (Otherwise, we need to worry about finding our place again in a 2372 * potentially changed list. It just doesn't seem worth the trouble 2373 * to do that. 2374 */ 2375 expireq_locked = false; 2376 num_local_entries = 0; 2377 prev_tln = NULL; 2378 tree_locked = TREE_UNLOCKED; 2379 SLIST_FOREACH_SAFE(cur_tln, &tlb->tlb_head, tln_list, tmp_tln) { 2380 /* 2381 * If this isn't associated with a TCPCB, we can pull it off 2382 * the list now. We need to be careful that the expire timer 2383 * hasn't already taken ownership (tln_expiretime == SBT_MAX). 2384 * If so, we let the expire timer code free the data. 2385 */ 2386 if (cur_tln->tln_closed) { 2387no_inp: 2388 /* 2389 * Get the expireq lock so we can get a consistent 2390 * read of tln_expiretime and so we can remove this 2391 * from the expireq. 2392 */ 2393 if (!expireq_locked) { 2394 TCPLOG_EXPIREQ_LOCK(); 2395 expireq_locked = true; 2396 } 2397 2398 /* 2399 * We ignore entries with tln_expiretime == SBT_MAX. 2400 * The expire timer code already owns those. 2401 */ 2402 KASSERT(cur_tln->tln_expiretime > (sbintime_t) 0, 2403 ("%s:%d: node on the expire queue without positive " 2404 "expire time", __func__, __LINE__)); 2405 if (cur_tln->tln_expiretime == SBT_MAX) { 2406 prev_tln = cur_tln; 2407 continue; 2408 } 2409 2410 /* Remove the entry from the expireq. */ 2411 STAILQ_REMOVE(&tcp_log_expireq_head, cur_tln, 2412 tcp_log_id_node, tln_expireq); 2413 2414 /* Remove the entry from the bucket. */ 2415 if (prev_tln != NULL) 2416 SLIST_REMOVE_AFTER(prev_tln, tln_list); 2417 else 2418 SLIST_REMOVE_HEAD(&tlb->tlb_head, tln_list); 2419 2420 /* 2421 * Drop the INP and bucket reference counts. Due to 2422 * lock-ordering rules, we need to drop the expire 2423 * queue lock. 2424 */ 2425 TCPLOG_EXPIREQ_UNLOCK(); 2426 expireq_locked = false; 2427 2428 /* Drop the INP reference. */ 2429 INP_WLOCK(cur_tln->tln_inp); 2430 if (!in_pcbrele_wlocked(cur_tln->tln_inp)) 2431 INP_WUNLOCK(cur_tln->tln_inp); 2432 2433 if (tcp_log_unref_bucket(tlb, &tree_locked, NULL)) { 2434#ifdef INVARIANTS 2435 panic("%s: Bucket refcount unexpectedly 0.", 2436 __func__); 2437#endif 2438 /* 2439 * Recover as best we can: free the entry we 2440 * own. 2441 */ 2442 tcp_log_free_entries(&cur_tln->tln_entries, 2443 &cur_tln->tln_count); 2444 uma_zfree(tcp_log_node_zone, cur_tln); 2445 goto done; 2446 } 2447 2448 if (tcp_log_dump_node_logbuf(cur_tln, reason, 2449 M_NOWAIT)) { 2450 /* 2451 * If we have sapce, save the entries locally. 2452 * Otherwise, free them. 2453 */ 2454 if (num_local_entries < LOCAL_SAVE) { 2455 local_entries[num_local_entries] = 2456 *cur_tln; 2457 num_local_entries++; 2458 } else { 2459 tcp_log_free_entries( 2460 &cur_tln->tln_entries, 2461 &cur_tln->tln_count); 2462 } 2463 } 2464 2465 /* No matter what, we are done with the node now. */ 2466 uma_zfree(tcp_log_node_zone, cur_tln); 2467 2468 /* 2469 * Because we removed this entry from the list, prev_tln 2470 * (which tracks the previous entry still on the tlb 2471 * list) remains unchanged. 2472 */ 2473 continue; 2474 } 2475 2476 /* 2477 * If we get to this point, the session data is still held in 2478 * the TCPCB. So, we need to pull the data out of that. 2479 * 2480 * We will need to drop the expireq lock so we can lock the INP. 2481 * We can then try to extract the data the "easy" way. If that 2482 * fails, we'll save the log entries for later. 2483 */ 2484 if (expireq_locked) { 2485 TCPLOG_EXPIREQ_UNLOCK(); 2486 expireq_locked = false; 2487 } 2488 2489 /* Lock the INP and then re-check the state. */ 2490 inp = cur_tln->tln_inp; 2491 INP_WLOCK(inp); 2492 /* 2493 * If we caught this while it was transitioning, the data 2494 * might have moved from the TCPCB to the tln (signified by 2495 * setting tln_closed to true. If so, treat this like an 2496 * inactive connection. 2497 */ 2498 if (cur_tln->tln_closed) { 2499 /* 2500 * It looks like we may have caught this connection 2501 * while it was transitioning from active to inactive. 2502 * Treat this like an inactive connection. 2503 */ 2504 INP_WUNLOCK(inp); 2505 goto no_inp; 2506 } 2507 2508 /* 2509 * Try to dump the data from the tp without dropping the lock. 2510 * If this fails, try to save off the data locally. 2511 */ 2512 tp = cur_tln->tln_tp; 2513 if (tcp_log_dump_tp_logbuf(tp, reason, M_NOWAIT, true) && 2514 num_local_entries < LOCAL_SAVE) { 2515 tcp_log_move_tp_to_node(tp, 2516 &local_entries[num_local_entries]); 2517 local_entries[num_local_entries].tln_closed = 1; 2518 KASSERT(local_entries[num_local_entries].tln_bucket == 2519 tlb, ("%s: %d: bucket mismatch for node %p", 2520 __func__, __LINE__, cur_tln)); 2521 num_local_entries++; 2522 } 2523 2524 INP_WUNLOCK(inp); 2525 2526 /* 2527 * We are goint to leave the current tln on the list. It will 2528 * become the previous tln. 2529 */ 2530 prev_tln = cur_tln; 2531 } 2532 2533 /* Drop our locks, if any. */ 2534 KASSERT(tree_locked == TREE_UNLOCKED, 2535 ("%s: %d: tree unexpectedly locked", __func__, __LINE__)); 2536 switch (tree_locked) { 2537 case TREE_WLOCKED: 2538 TCPID_TREE_WUNLOCK(); 2539 tree_locked = TREE_UNLOCKED; 2540 break; 2541 case TREE_RLOCKED: 2542 TCPID_TREE_RUNLOCK(); 2543 tree_locked = TREE_UNLOCKED; 2544 break; 2545 } 2546 if (expireq_locked) { 2547 TCPLOG_EXPIREQ_UNLOCK(); 2548 expireq_locked = false; 2549 } 2550 2551 /* 2552 * Try again for any saved entries. tcp_log_dump_node_logbuf() is 2553 * guaranteed to free the log entries within the node. And, since 2554 * the node itself is on our stack, we don't need to free it. 2555 */ 2556 for (i = 0; i < num_local_entries; i++) 2557 tcp_log_dump_node_logbuf(&local_entries[i], reason, M_WAITOK); 2558 2559 /* Drop our reference. */ 2560 if (!tcp_log_unref_bucket(tlb, &tree_locked, NULL)) 2561 TCPID_BUCKET_UNLOCK(tlb); 2562 2563done: 2564 /* Drop our locks, if any. */ 2565 switch (tree_locked) { 2566 case TREE_WLOCKED: 2567 TCPID_TREE_WUNLOCK(); 2568 break; 2569 case TREE_RLOCKED: 2570 TCPID_TREE_RUNLOCK(); 2571 break; 2572 } 2573 if (expireq_locked) 2574 TCPLOG_EXPIREQ_UNLOCK(); 2575} 2576#undef LOCAL_SAVE 2577 2578/* 2579 * Queue the log buffers for all sessions in a bucket for transmissions via 2580 * the log buffer facility. 2581 * 2582 * NOTE: This should be called with a locked INP; however, the function 2583 * will drop the lock. 2584 */ 2585void 2586tcp_log_dump_tp_bucket_logbufs(struct tcpcb *tp, char *reason) 2587{ 2588 struct tcp_log_id_bucket *tlb; 2589 int tree_locked; 2590 2591 /* Figure out our bucket and lock it. */ 2592 INP_WLOCK_ASSERT(tp->t_inpcb); 2593 tlb = tp->t_lib; 2594 if (tlb == NULL) { 2595 /* 2596 * No bucket; treat this like a request to dump a single 2597 * session's traces. 2598 */ 2599 (void)tcp_log_dump_tp_logbuf(tp, reason, M_WAITOK, true); 2600 INP_WUNLOCK(tp->t_inpcb); 2601 return; 2602 } 2603 TCPID_BUCKET_REF(tlb); 2604 INP_WUNLOCK(tp->t_inpcb); 2605 TCPID_BUCKET_LOCK(tlb); 2606 2607 /* If we are the last reference, we have nothing more to do here. */ 2608 tree_locked = TREE_UNLOCKED; 2609 if (tcp_log_unref_bucket(tlb, &tree_locked, NULL)) { 2610 switch (tree_locked) { 2611 case TREE_WLOCKED: 2612 TCPID_TREE_WUNLOCK(); 2613 break; 2614 case TREE_RLOCKED: 2615 TCPID_TREE_RUNLOCK(); 2616 break; 2617 } 2618 return; 2619 } 2620 2621 /* Turn this over to tcp_log_dumpbucketlogs() to finish the work. */ 2622 tcp_log_dumpbucketlogs(tlb, reason); 2623} 2624 2625/* 2626 * Mark the end of a flow with the current stack. A stack can add 2627 * stack-specific info to this trace event by overriding this 2628 * function (see bbr_log_flowend() for example). 2629 */ 2630void 2631tcp_log_flowend(struct tcpcb *tp) 2632{ 2633 if (tp->t_logstate != TCP_LOG_STATE_OFF) { 2634 struct socket *so = tp->t_inpcb->inp_socket; 2635 TCP_LOG_EVENT(tp, NULL, &so->so_rcv, &so->so_snd, 2636 TCP_LOG_FLOWEND, 0, 0, NULL, false); 2637 } 2638} 2639