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917 Make TCP's iss_incr a tunable
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--- old/usr/src/uts/common/inet/tcp/tcp.c
+++ new/usr/src/uts/common/inet/tcp/tcp.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21
22 22 /*
23 23 * Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved.
24 24 * Copyright (c) 2011, Joyent Inc. All rights reserved.
25 25 * Copyright (c) 2011 Nexenta Systems, Inc. All rights reserved.
26 26 */
27 27 /* Copyright (c) 1990 Mentat Inc. */
28 28
29 29 #include <sys/types.h>
30 30 #include <sys/stream.h>
31 31 #include <sys/strsun.h>
32 32 #include <sys/strsubr.h>
33 33 #include <sys/stropts.h>
34 34 #include <sys/strlog.h>
35 35 #define _SUN_TPI_VERSION 2
36 36 #include <sys/tihdr.h>
37 37 #include <sys/timod.h>
38 38 #include <sys/ddi.h>
39 39 #include <sys/sunddi.h>
40 40 #include <sys/suntpi.h>
41 41 #include <sys/xti_inet.h>
42 42 #include <sys/cmn_err.h>
43 43 #include <sys/debug.h>
44 44 #include <sys/sdt.h>
45 45 #include <sys/vtrace.h>
46 46 #include <sys/kmem.h>
47 47 #include <sys/ethernet.h>
48 48 #include <sys/cpuvar.h>
49 49 #include <sys/dlpi.h>
50 50 #include <sys/pattr.h>
51 51 #include <sys/policy.h>
52 52 #include <sys/priv.h>
53 53 #include <sys/zone.h>
54 54 #include <sys/sunldi.h>
55 55
56 56 #include <sys/errno.h>
57 57 #include <sys/signal.h>
58 58 #include <sys/socket.h>
59 59 #include <sys/socketvar.h>
60 60 #include <sys/sockio.h>
61 61 #include <sys/isa_defs.h>
62 62 #include <sys/md5.h>
63 63 #include <sys/random.h>
64 64 #include <sys/uio.h>
65 65 #include <sys/systm.h>
66 66 #include <netinet/in.h>
67 67 #include <netinet/tcp.h>
68 68 #include <netinet/ip6.h>
69 69 #include <netinet/icmp6.h>
70 70 #include <net/if.h>
71 71 #include <net/route.h>
72 72 #include <inet/ipsec_impl.h>
73 73
74 74 #include <inet/common.h>
75 75 #include <inet/ip.h>
76 76 #include <inet/ip_impl.h>
77 77 #include <inet/ip6.h>
78 78 #include <inet/ip_ndp.h>
79 79 #include <inet/proto_set.h>
80 80 #include <inet/mib2.h>
81 81 #include <inet/optcom.h>
82 82 #include <inet/snmpcom.h>
83 83 #include <inet/kstatcom.h>
84 84 #include <inet/tcp.h>
85 85 #include <inet/tcp_impl.h>
86 86 #include <inet/tcp_cluster.h>
87 87 #include <inet/udp_impl.h>
88 88 #include <net/pfkeyv2.h>
89 89 #include <inet/ipdrop.h>
90 90
91 91 #include <inet/ipclassifier.h>
92 92 #include <inet/ip_ire.h>
93 93 #include <inet/ip_ftable.h>
94 94 #include <inet/ip_if.h>
95 95 #include <inet/ipp_common.h>
96 96 #include <inet/ip_rts.h>
97 97 #include <inet/ip_netinfo.h>
98 98 #include <sys/squeue_impl.h>
99 99 #include <sys/squeue.h>
100 100 #include <sys/tsol/label.h>
101 101 #include <sys/tsol/tnet.h>
102 102 #include <rpc/pmap_prot.h>
103 103 #include <sys/callo.h>
104 104
105 105 /*
106 106 * TCP Notes: aka FireEngine Phase I (PSARC 2002/433)
107 107 *
108 108 * (Read the detailed design doc in PSARC case directory)
109 109 *
110 110 * The entire tcp state is contained in tcp_t and conn_t structure
111 111 * which are allocated in tandem using ipcl_conn_create() and passing
112 112 * IPCL_TCPCONN as a flag. We use 'conn_ref' and 'conn_lock' to protect
113 113 * the references on the tcp_t. The tcp_t structure is never compressed
114 114 * and packets always land on the correct TCP perimeter from the time
115 115 * eager is created till the time tcp_t dies (as such the old mentat
116 116 * TCP global queue is not used for detached state and no IPSEC checking
117 117 * is required). The global queue is still allocated to send out resets
118 118 * for connection which have no listeners and IP directly calls
119 119 * tcp_xmit_listeners_reset() which does any policy check.
120 120 *
121 121 * Protection and Synchronisation mechanism:
122 122 *
123 123 * The tcp data structure does not use any kind of lock for protecting
124 124 * its state but instead uses 'squeues' for mutual exclusion from various
125 125 * read and write side threads. To access a tcp member, the thread should
126 126 * always be behind squeue (via squeue_enter with flags as SQ_FILL, SQ_PROCESS,
127 127 * or SQ_NODRAIN). Since the squeues allow a direct function call, caller
128 128 * can pass any tcp function having prototype of edesc_t as argument
129 129 * (different from traditional STREAMs model where packets come in only
130 130 * designated entry points). The list of functions that can be directly
131 131 * called via squeue are listed before the usual function prototype.
132 132 *
133 133 * Referencing:
134 134 *
135 135 * TCP is MT-Hot and we use a reference based scheme to make sure that the
136 136 * tcp structure doesn't disappear when its needed. When the application
137 137 * creates an outgoing connection or accepts an incoming connection, we
138 138 * start out with 2 references on 'conn_ref'. One for TCP and one for IP.
139 139 * The IP reference is just a symbolic reference since ip_tcpclose()
140 140 * looks at tcp structure after tcp_close_output() returns which could
141 141 * have dropped the last TCP reference. So as long as the connection is
142 142 * in attached state i.e. !TCP_IS_DETACHED, we have 2 references on the
143 143 * conn_t. The classifier puts its own reference when the connection is
144 144 * inserted in listen or connected hash. Anytime a thread needs to enter
145 145 * the tcp connection perimeter, it retrieves the conn/tcp from q->ptr
146 146 * on write side or by doing a classify on read side and then puts a
147 147 * reference on the conn before doing squeue_enter/tryenter/fill. For
148 148 * read side, the classifier itself puts the reference under fanout lock
149 149 * to make sure that tcp can't disappear before it gets processed. The
150 150 * squeue will drop this reference automatically so the called function
151 151 * doesn't have to do a DEC_REF.
152 152 *
153 153 * Opening a new connection:
154 154 *
155 155 * The outgoing connection open is pretty simple. tcp_open() does the
156 156 * work in creating the conn/tcp structure and initializing it. The
157 157 * squeue assignment is done based on the CPU the application
158 158 * is running on. So for outbound connections, processing is always done
159 159 * on application CPU which might be different from the incoming CPU
160 160 * being interrupted by the NIC. An optimal way would be to figure out
161 161 * the NIC <-> CPU binding at listen time, and assign the outgoing
162 162 * connection to the squeue attached to the CPU that will be interrupted
163 163 * for incoming packets (we know the NIC based on the bind IP address).
164 164 * This might seem like a problem if more data is going out but the
165 165 * fact is that in most cases the transmit is ACK driven transmit where
166 166 * the outgoing data normally sits on TCP's xmit queue waiting to be
167 167 * transmitted.
168 168 *
169 169 * Accepting a connection:
170 170 *
171 171 * This is a more interesting case because of various races involved in
172 172 * establishing a eager in its own perimeter. Read the meta comment on
173 173 * top of tcp_input_listener(). But briefly, the squeue is picked by
174 174 * ip_fanout based on the ring or the sender (if loopback).
175 175 *
176 176 * Closing a connection:
177 177 *
178 178 * The close is fairly straight forward. tcp_close() calls tcp_close_output()
179 179 * via squeue to do the close and mark the tcp as detached if the connection
180 180 * was in state TCPS_ESTABLISHED or greater. In the later case, TCP keep its
181 181 * reference but tcp_close() drop IP's reference always. So if tcp was
182 182 * not killed, it is sitting in time_wait list with 2 reference - 1 for TCP
183 183 * and 1 because it is in classifier's connected hash. This is the condition
184 184 * we use to determine that its OK to clean up the tcp outside of squeue
185 185 * when time wait expires (check the ref under fanout and conn_lock and
186 186 * if it is 2, remove it from fanout hash and kill it).
187 187 *
188 188 * Although close just drops the necessary references and marks the
189 189 * tcp_detached state, tcp_close needs to know the tcp_detached has been
190 190 * set (under squeue) before letting the STREAM go away (because a
191 191 * inbound packet might attempt to go up the STREAM while the close
192 192 * has happened and tcp_detached is not set). So a special lock and
193 193 * flag is used along with a condition variable (tcp_closelock, tcp_closed,
194 194 * and tcp_closecv) to signal tcp_close that tcp_close_out() has marked
195 195 * tcp_detached.
196 196 *
197 197 * Special provisions and fast paths:
198 198 *
199 199 * We make special provisions for sockfs by marking tcp_issocket
200 200 * whenever we have only sockfs on top of TCP. This allows us to skip
201 201 * putting the tcp in acceptor hash since a sockfs listener can never
202 202 * become acceptor and also avoid allocating a tcp_t for acceptor STREAM
203 203 * since eager has already been allocated and the accept now happens
204 204 * on acceptor STREAM. There is a big blob of comment on top of
205 205 * tcp_input_listener explaining the new accept. When socket is POP'd,
206 206 * sockfs sends us an ioctl to mark the fact and we go back to old
207 207 * behaviour. Once tcp_issocket is unset, its never set for the
208 208 * life of that connection.
209 209 *
210 210 * IPsec notes :
211 211 *
212 212 * Since a packet is always executed on the correct TCP perimeter
213 213 * all IPsec processing is defered to IP including checking new
214 214 * connections and setting IPSEC policies for new connection. The
215 215 * only exception is tcp_xmit_listeners_reset() which is called
216 216 * directly from IP and needs to policy check to see if TH_RST
217 217 * can be sent out.
218 218 */
219 219
220 220 /*
221 221 * Values for squeue switch:
222 222 * 1: SQ_NODRAIN
223 223 * 2: SQ_PROCESS
224 224 * 3: SQ_FILL
225 225 */
226 226 int tcp_squeue_wput = 2; /* /etc/systems */
227 227 int tcp_squeue_flag;
228 228
229 229 /*
230 230 * To prevent memory hog, limit the number of entries in tcp_free_list
231 231 * to 1% of available memory / number of cpus
232 232 */
233 233 uint_t tcp_free_list_max_cnt = 0;
234 234
235 235 #define TCP_XMIT_LOWATER 4096
236 236 #define TCP_XMIT_HIWATER 49152
237 237 #define TCP_RECV_LOWATER 2048
238 238 #define TCP_RECV_HIWATER 128000
239 239
240 240 #define TIDUSZ 4096 /* transport interface data unit size */
241 241
242 242 /*
243 243 * Size of acceptor hash list. It has to be a power of 2 for hashing.
244 244 */
245 245 #define TCP_ACCEPTOR_FANOUT_SIZE 512
246 246
247 247 #ifdef _ILP32
248 248 #define TCP_ACCEPTOR_HASH(accid) \
249 249 (((uint_t)(accid) >> 8) & (TCP_ACCEPTOR_FANOUT_SIZE - 1))
250 250 #else
251 251 #define TCP_ACCEPTOR_HASH(accid) \
252 252 ((uint_t)(accid) & (TCP_ACCEPTOR_FANOUT_SIZE - 1))
253 253 #endif /* _ILP32 */
254 254
255 255 /*
256 256 * Minimum number of connections which can be created per listener. Used
257 257 * when the listener connection count is in effect.
258 258 */
259 259 static uint32_t tcp_min_conn_listener = 2;
260 260
261 261 uint32_t tcp_early_abort = 30;
262 262
263 263 /* TCP Timer control structure */
264 264 typedef struct tcpt_s {
265 265 pfv_t tcpt_pfv; /* The routine we are to call */
266 266 tcp_t *tcpt_tcp; /* The parameter we are to pass in */
267 267 } tcpt_t;
268 268
269 269 /*
270 270 * Functions called directly via squeue having a prototype of edesc_t.
271 271 */
272 272 void tcp_input_listener(void *arg, mblk_t *mp, void *arg2,
273 273 ip_recv_attr_t *ira);
274 274 void tcp_input_data(void *arg, mblk_t *mp, void *arg2,
275 275 ip_recv_attr_t *ira);
276 276 static void tcp_linger_interrupted(void *arg, mblk_t *mp, void *arg2,
277 277 ip_recv_attr_t *dummy);
278 278
279 279
280 280 /* Prototype for TCP functions */
281 281 static void tcp_random_init(void);
282 282 int tcp_random(void);
283 283 static int tcp_connect_ipv4(tcp_t *tcp, ipaddr_t *dstaddrp,
284 284 in_port_t dstport, uint_t srcid);
285 285 static int tcp_connect_ipv6(tcp_t *tcp, in6_addr_t *dstaddrp,
286 286 in_port_t dstport, uint32_t flowinfo,
287 287 uint_t srcid, uint32_t scope_id);
288 288 static void tcp_iss_init(tcp_t *tcp);
289 289 static void tcp_reinit(tcp_t *tcp);
290 290 static void tcp_reinit_values(tcp_t *tcp);
291 291
292 292 static void tcp_wsrv(queue_t *q);
293 293 static void tcp_update_lso(tcp_t *tcp, ip_xmit_attr_t *ixa);
294 294 static void tcp_update_zcopy(tcp_t *tcp);
295 295 static void tcp_notify(void *, ip_xmit_attr_t *, ixa_notify_type_t,
296 296 ixa_notify_arg_t);
297 297 static void *tcp_stack_init(netstackid_t stackid, netstack_t *ns);
298 298 static void tcp_stack_fini(netstackid_t stackid, void *arg);
299 299
300 300 static int tcp_squeue_switch(int);
301 301
302 302 static int tcp_open(queue_t *, dev_t *, int, int, cred_t *, boolean_t);
303 303 static int tcp_openv4(queue_t *, dev_t *, int, int, cred_t *);
304 304 static int tcp_openv6(queue_t *, dev_t *, int, int, cred_t *);
305 305
306 306 static void tcp_squeue_add(squeue_t *);
307 307
308 308 struct module_info tcp_rinfo = {
309 309 TCP_MOD_ID, TCP_MOD_NAME, 0, INFPSZ, TCP_RECV_HIWATER, TCP_RECV_LOWATER
310 310 };
311 311
312 312 static struct module_info tcp_winfo = {
313 313 TCP_MOD_ID, TCP_MOD_NAME, 0, INFPSZ, 127, 16
314 314 };
315 315
316 316 /*
317 317 * Entry points for TCP as a device. The normal case which supports
318 318 * the TCP functionality.
319 319 * We have separate open functions for the /dev/tcp and /dev/tcp6 devices.
320 320 */
321 321 struct qinit tcp_rinitv4 = {
322 322 NULL, (pfi_t)tcp_rsrv, tcp_openv4, tcp_tpi_close, NULL, &tcp_rinfo
323 323 };
324 324
325 325 struct qinit tcp_rinitv6 = {
326 326 NULL, (pfi_t)tcp_rsrv, tcp_openv6, tcp_tpi_close, NULL, &tcp_rinfo
327 327 };
328 328
329 329 struct qinit tcp_winit = {
330 330 (pfi_t)tcp_wput, (pfi_t)tcp_wsrv, NULL, NULL, NULL, &tcp_winfo
331 331 };
332 332
333 333 /* Initial entry point for TCP in socket mode. */
334 334 struct qinit tcp_sock_winit = {
335 335 (pfi_t)tcp_wput_sock, (pfi_t)tcp_wsrv, NULL, NULL, NULL, &tcp_winfo
336 336 };
337 337
338 338 /* TCP entry point during fallback */
339 339 struct qinit tcp_fallback_sock_winit = {
340 340 (pfi_t)tcp_wput_fallback, NULL, NULL, NULL, NULL, &tcp_winfo
341 341 };
342 342
343 343 /*
344 344 * Entry points for TCP as a acceptor STREAM opened by sockfs when doing
345 345 * an accept. Avoid allocating data structures since eager has already
346 346 * been created.
347 347 */
348 348 struct qinit tcp_acceptor_rinit = {
349 349 NULL, (pfi_t)tcp_rsrv, NULL, tcp_tpi_close_accept, NULL, &tcp_winfo
350 350 };
351 351
352 352 struct qinit tcp_acceptor_winit = {
353 353 (pfi_t)tcp_tpi_accept, NULL, NULL, NULL, NULL, &tcp_winfo
354 354 };
355 355
356 356 /* For AF_INET aka /dev/tcp */
357 357 struct streamtab tcpinfov4 = {
358 358 &tcp_rinitv4, &tcp_winit
359 359 };
360 360
361 361 /* For AF_INET6 aka /dev/tcp6 */
362 362 struct streamtab tcpinfov6 = {
363 363 &tcp_rinitv6, &tcp_winit
364 364 };
365 365
366 366 /*
367 367 * Following assumes TPI alignment requirements stay along 32 bit
368 368 * boundaries
369 369 */
370 370 #define ROUNDUP32(x) \
371 371 (((x) + (sizeof (int32_t) - 1)) & ~(sizeof (int32_t) - 1))
372 372
373 373 /* Template for response to info request. */
374 374 struct T_info_ack tcp_g_t_info_ack = {
375 375 T_INFO_ACK, /* PRIM_type */
376 376 0, /* TSDU_size */
377 377 T_INFINITE, /* ETSDU_size */
378 378 T_INVALID, /* CDATA_size */
379 379 T_INVALID, /* DDATA_size */
380 380 sizeof (sin_t), /* ADDR_size */
381 381 0, /* OPT_size - not initialized here */
382 382 TIDUSZ, /* TIDU_size */
383 383 T_COTS_ORD, /* SERV_type */
384 384 TCPS_IDLE, /* CURRENT_state */
385 385 (XPG4_1|EXPINLINE) /* PROVIDER_flag */
386 386 };
387 387
388 388 struct T_info_ack tcp_g_t_info_ack_v6 = {
389 389 T_INFO_ACK, /* PRIM_type */
390 390 0, /* TSDU_size */
391 391 T_INFINITE, /* ETSDU_size */
392 392 T_INVALID, /* CDATA_size */
393 393 T_INVALID, /* DDATA_size */
394 394 sizeof (sin6_t), /* ADDR_size */
395 395 0, /* OPT_size - not initialized here */
396 396 TIDUSZ, /* TIDU_size */
397 397 T_COTS_ORD, /* SERV_type */
398 398 TCPS_IDLE, /* CURRENT_state */
399 399 (XPG4_1|EXPINLINE) /* PROVIDER_flag */
400 400 };
401 401
402 402 /*
403 403 * TCP tunables related declarations. Definitions are in tcp_tunables.c
404 404 */
405 405 extern mod_prop_info_t tcp_propinfo_tbl[];
406 406 extern int tcp_propinfo_count;
407 407
408 408 #define IS_VMLOANED_MBLK(mp) \
409 409 (((mp)->b_datap->db_struioflag & STRUIO_ZC) != 0)
410 410
411 411 uint32_t do_tcpzcopy = 1; /* 0: disable, 1: enable, 2: force */
412 412
413 413 /*
414 414 * Forces all connections to obey the value of the tcps_maxpsz_multiplier
415 415 * tunable settable via NDD. Otherwise, the per-connection behavior is
416 416 * determined dynamically during tcp_set_destination(), which is the default.
417 417 */
418 418 boolean_t tcp_static_maxpsz = B_FALSE;
419 419
420 420 /*
421 421 * If the receive buffer size is changed, this function is called to update
422 422 * the upper socket layer on the new delayed receive wake up threshold.
423 423 */
424 424 static void
425 425 tcp_set_recv_threshold(tcp_t *tcp, uint32_t new_rcvthresh)
426 426 {
427 427 uint32_t default_threshold = SOCKET_RECVHIWATER >> 3;
428 428
429 429 if (IPCL_IS_NONSTR(tcp->tcp_connp)) {
430 430 conn_t *connp = tcp->tcp_connp;
431 431 struct sock_proto_props sopp;
432 432
433 433 /*
434 434 * only increase rcvthresh upto default_threshold
435 435 */
436 436 if (new_rcvthresh > default_threshold)
437 437 new_rcvthresh = default_threshold;
438 438
439 439 sopp.sopp_flags = SOCKOPT_RCVTHRESH;
440 440 sopp.sopp_rcvthresh = new_rcvthresh;
441 441
442 442 (*connp->conn_upcalls->su_set_proto_props)
443 443 (connp->conn_upper_handle, &sopp);
444 444 }
445 445 }
446 446
447 447 /*
448 448 * Figure out the value of window scale opton. Note that the rwnd is
449 449 * ASSUMED to be rounded up to the nearest MSS before the calculation.
450 450 * We cannot find the scale value and then do a round up of tcp_rwnd
451 451 * because the scale value may not be correct after that.
452 452 *
453 453 * Set the compiler flag to make this function inline.
454 454 */
455 455 void
456 456 tcp_set_ws_value(tcp_t *tcp)
457 457 {
458 458 int i;
459 459 uint32_t rwnd = tcp->tcp_rwnd;
460 460
461 461 for (i = 0; rwnd > TCP_MAXWIN && i < TCP_MAX_WINSHIFT;
462 462 i++, rwnd >>= 1)
463 463 ;
464 464 tcp->tcp_rcv_ws = i;
465 465 }
466 466
467 467 /*
468 468 * Remove cached/latched IPsec references.
469 469 */
470 470 void
471 471 tcp_ipsec_cleanup(tcp_t *tcp)
472 472 {
473 473 conn_t *connp = tcp->tcp_connp;
474 474
475 475 ASSERT(connp->conn_flags & IPCL_TCPCONN);
476 476
477 477 if (connp->conn_latch != NULL) {
478 478 IPLATCH_REFRELE(connp->conn_latch);
479 479 connp->conn_latch = NULL;
480 480 }
481 481 if (connp->conn_latch_in_policy != NULL) {
482 482 IPPOL_REFRELE(connp->conn_latch_in_policy);
483 483 connp->conn_latch_in_policy = NULL;
484 484 }
485 485 if (connp->conn_latch_in_action != NULL) {
486 486 IPACT_REFRELE(connp->conn_latch_in_action);
487 487 connp->conn_latch_in_action = NULL;
488 488 }
489 489 if (connp->conn_policy != NULL) {
490 490 IPPH_REFRELE(connp->conn_policy, connp->conn_netstack);
491 491 connp->conn_policy = NULL;
492 492 }
493 493 }
494 494
495 495 /*
496 496 * Cleaup before placing on free list.
497 497 * Disassociate from the netstack/tcp_stack_t since the freelist
498 498 * is per squeue and not per netstack.
499 499 */
500 500 void
501 501 tcp_cleanup(tcp_t *tcp)
502 502 {
503 503 mblk_t *mp;
504 504 conn_t *connp = tcp->tcp_connp;
505 505 tcp_stack_t *tcps = tcp->tcp_tcps;
506 506 netstack_t *ns = tcps->tcps_netstack;
507 507 mblk_t *tcp_rsrv_mp;
508 508
509 509 tcp_bind_hash_remove(tcp);
510 510
511 511 /* Cleanup that which needs the netstack first */
512 512 tcp_ipsec_cleanup(tcp);
513 513 ixa_cleanup(connp->conn_ixa);
514 514
515 515 if (connp->conn_ht_iphc != NULL) {
516 516 kmem_free(connp->conn_ht_iphc, connp->conn_ht_iphc_allocated);
517 517 connp->conn_ht_iphc = NULL;
518 518 connp->conn_ht_iphc_allocated = 0;
519 519 connp->conn_ht_iphc_len = 0;
520 520 connp->conn_ht_ulp = NULL;
521 521 connp->conn_ht_ulp_len = 0;
522 522 tcp->tcp_ipha = NULL;
523 523 tcp->tcp_ip6h = NULL;
524 524 tcp->tcp_tcpha = NULL;
525 525 }
526 526
527 527 /* We clear any IP_OPTIONS and extension headers */
528 528 ip_pkt_free(&connp->conn_xmit_ipp);
529 529
530 530 tcp_free(tcp);
531 531
532 532 /*
533 533 * Since we will bzero the entire structure, we need to
534 534 * remove it and reinsert it in global hash list. We
535 535 * know the walkers can't get to this conn because we
536 536 * had set CONDEMNED flag earlier and checked reference
537 537 * under conn_lock so walker won't pick it and when we
538 538 * go the ipcl_globalhash_remove() below, no walker
539 539 * can get to it.
540 540 */
541 541 ipcl_globalhash_remove(connp);
542 542
543 543 /* Save some state */
544 544 mp = tcp->tcp_timercache;
545 545
546 546 tcp_rsrv_mp = tcp->tcp_rsrv_mp;
547 547
548 548 if (connp->conn_cred != NULL) {
549 549 crfree(connp->conn_cred);
550 550 connp->conn_cred = NULL;
551 551 }
552 552 ipcl_conn_cleanup(connp);
553 553 connp->conn_flags = IPCL_TCPCONN;
554 554
555 555 /*
556 556 * Now it is safe to decrement the reference counts.
557 557 * This might be the last reference on the netstack
558 558 * in which case it will cause the freeing of the IP Instance.
559 559 */
560 560 connp->conn_netstack = NULL;
561 561 connp->conn_ixa->ixa_ipst = NULL;
562 562 netstack_rele(ns);
563 563 ASSERT(tcps != NULL);
564 564 tcp->tcp_tcps = NULL;
565 565
566 566 bzero(tcp, sizeof (tcp_t));
567 567
568 568 /* restore the state */
569 569 tcp->tcp_timercache = mp;
570 570
571 571 tcp->tcp_rsrv_mp = tcp_rsrv_mp;
572 572
573 573 tcp->tcp_connp = connp;
574 574
575 575 ASSERT(connp->conn_tcp == tcp);
576 576 ASSERT(connp->conn_flags & IPCL_TCPCONN);
577 577 connp->conn_state_flags = CONN_INCIPIENT;
578 578 ASSERT(connp->conn_proto == IPPROTO_TCP);
579 579 ASSERT(connp->conn_ref == 1);
580 580 }
581 581
582 582 /*
583 583 * Adapt to the information, such as rtt and rtt_sd, provided from the
584 584 * DCE and IRE maintained by IP.
585 585 *
586 586 * Checks for multicast and broadcast destination address.
587 587 * Returns zero if ok; an errno on failure.
588 588 *
589 589 * Note that the MSS calculation here is based on the info given in
590 590 * the DCE and IRE. We do not do any calculation based on TCP options. They
591 591 * will be handled in tcp_input_data() when TCP knows which options to use.
592 592 *
593 593 * Note on how TCP gets its parameters for a connection.
594 594 *
595 595 * When a tcp_t structure is allocated, it gets all the default parameters.
596 596 * In tcp_set_destination(), it gets those metric parameters, like rtt, rtt_sd,
597 597 * spipe, rpipe, ... from the route metrics. Route metric overrides the
598 598 * default.
599 599 *
600 600 * An incoming SYN with a multicast or broadcast destination address is dropped
601 601 * in ip_fanout_v4/v6.
602 602 *
603 603 * An incoming SYN with a multicast or broadcast source address is always
604 604 * dropped in tcp_set_destination, since IPDF_ALLOW_MCBC is not set in
605 605 * conn_connect.
606 606 * The same logic in tcp_set_destination also serves to
607 607 * reject an attempt to connect to a broadcast or multicast (destination)
608 608 * address.
609 609 */
610 610 int
611 611 tcp_set_destination(tcp_t *tcp)
612 612 {
613 613 uint32_t mss_max;
614 614 uint32_t mss;
615 615 boolean_t tcp_detached = TCP_IS_DETACHED(tcp);
616 616 conn_t *connp = tcp->tcp_connp;
617 617 tcp_stack_t *tcps = tcp->tcp_tcps;
618 618 iulp_t uinfo;
619 619 int error;
620 620 uint32_t flags;
621 621
622 622 flags = IPDF_LSO | IPDF_ZCOPY;
623 623 /*
624 624 * Make sure we have a dce for the destination to avoid dce_ident
625 625 * contention for connected sockets.
626 626 */
627 627 flags |= IPDF_UNIQUE_DCE;
628 628
629 629 if (!tcps->tcps_ignore_path_mtu)
630 630 connp->conn_ixa->ixa_flags |= IXAF_PMTU_DISCOVERY;
631 631
632 632 /* Use conn_lock to satify ASSERT; tcp is already serialized */
633 633 mutex_enter(&connp->conn_lock);
634 634 error = conn_connect(connp, &uinfo, flags);
635 635 mutex_exit(&connp->conn_lock);
636 636 if (error != 0)
637 637 return (error);
638 638
639 639 error = tcp_build_hdrs(tcp);
640 640 if (error != 0)
641 641 return (error);
642 642
643 643 tcp->tcp_localnet = uinfo.iulp_localnet;
644 644
645 645 if (uinfo.iulp_rtt != 0) {
646 646 clock_t rto;
647 647
648 648 tcp->tcp_rtt_sa = uinfo.iulp_rtt;
649 649 tcp->tcp_rtt_sd = uinfo.iulp_rtt_sd;
650 650 rto = (tcp->tcp_rtt_sa >> 3) + tcp->tcp_rtt_sd +
651 651 tcps->tcps_rexmit_interval_extra +
652 652 (tcp->tcp_rtt_sa >> 5);
653 653
654 654 TCP_SET_RTO(tcp, rto);
655 655 }
656 656 if (uinfo.iulp_ssthresh != 0)
657 657 tcp->tcp_cwnd_ssthresh = uinfo.iulp_ssthresh;
658 658 else
659 659 tcp->tcp_cwnd_ssthresh = TCP_MAX_LARGEWIN;
660 660 if (uinfo.iulp_spipe > 0) {
661 661 connp->conn_sndbuf = MIN(uinfo.iulp_spipe,
662 662 tcps->tcps_max_buf);
663 663 if (tcps->tcps_snd_lowat_fraction != 0) {
664 664 connp->conn_sndlowat = connp->conn_sndbuf /
665 665 tcps->tcps_snd_lowat_fraction;
666 666 }
667 667 (void) tcp_maxpsz_set(tcp, B_TRUE);
668 668 }
669 669 /*
670 670 * Note that up till now, acceptor always inherits receive
671 671 * window from the listener. But if there is a metrics
672 672 * associated with a host, we should use that instead of
673 673 * inheriting it from listener. Thus we need to pass this
674 674 * info back to the caller.
675 675 */
676 676 if (uinfo.iulp_rpipe > 0) {
677 677 tcp->tcp_rwnd = MIN(uinfo.iulp_rpipe,
678 678 tcps->tcps_max_buf);
679 679 }
680 680
681 681 if (uinfo.iulp_rtomax > 0) {
682 682 tcp->tcp_second_timer_threshold =
683 683 uinfo.iulp_rtomax;
684 684 }
685 685
686 686 /*
687 687 * Use the metric option settings, iulp_tstamp_ok and
688 688 * iulp_wscale_ok, only for active open. What this means
689 689 * is that if the other side uses timestamp or window
690 690 * scale option, TCP will also use those options. That
691 691 * is for passive open. If the application sets a
692 692 * large window, window scale is enabled regardless of
693 693 * the value in iulp_wscale_ok. This is the behavior
694 694 * since 2.6. So we keep it.
695 695 * The only case left in passive open processing is the
696 696 * check for SACK.
697 697 * For ECN, it should probably be like SACK. But the
698 698 * current value is binary, so we treat it like the other
699 699 * cases. The metric only controls active open.For passive
700 700 * open, the ndd param, tcp_ecn_permitted, controls the
701 701 * behavior.
702 702 */
703 703 if (!tcp_detached) {
704 704 /*
705 705 * The if check means that the following can only
706 706 * be turned on by the metrics only IRE, but not off.
707 707 */
708 708 if (uinfo.iulp_tstamp_ok)
709 709 tcp->tcp_snd_ts_ok = B_TRUE;
710 710 if (uinfo.iulp_wscale_ok)
711 711 tcp->tcp_snd_ws_ok = B_TRUE;
712 712 if (uinfo.iulp_sack == 2)
713 713 tcp->tcp_snd_sack_ok = B_TRUE;
714 714 if (uinfo.iulp_ecn_ok)
715 715 tcp->tcp_ecn_ok = B_TRUE;
716 716 } else {
717 717 /*
718 718 * Passive open.
719 719 *
720 720 * As above, the if check means that SACK can only be
721 721 * turned on by the metric only IRE.
722 722 */
723 723 if (uinfo.iulp_sack > 0) {
724 724 tcp->tcp_snd_sack_ok = B_TRUE;
725 725 }
726 726 }
727 727
728 728 /*
729 729 * XXX Note that currently, iulp_mtu can be as small as 68
730 730 * because of PMTUd. So tcp_mss may go to negative if combined
731 731 * length of all those options exceeds 28 bytes. But because
732 732 * of the tcp_mss_min check below, we may not have a problem if
733 733 * tcp_mss_min is of a reasonable value. The default is 1 so
734 734 * the negative problem still exists. And the check defeats PMTUd.
735 735 * In fact, if PMTUd finds that the MSS should be smaller than
736 736 * tcp_mss_min, TCP should turn off PMUTd and use the tcp_mss_min
737 737 * value.
738 738 *
739 739 * We do not deal with that now. All those problems related to
740 740 * PMTUd will be fixed later.
741 741 */
742 742 ASSERT(uinfo.iulp_mtu != 0);
743 743 mss = tcp->tcp_initial_pmtu = uinfo.iulp_mtu;
744 744
745 745 /* Sanity check for MSS value. */
746 746 if (connp->conn_ipversion == IPV4_VERSION)
747 747 mss_max = tcps->tcps_mss_max_ipv4;
748 748 else
749 749 mss_max = tcps->tcps_mss_max_ipv6;
750 750
751 751 if (tcp->tcp_ipsec_overhead == 0)
752 752 tcp->tcp_ipsec_overhead = conn_ipsec_length(connp);
753 753
754 754 mss -= tcp->tcp_ipsec_overhead;
755 755
756 756 if (mss < tcps->tcps_mss_min)
757 757 mss = tcps->tcps_mss_min;
758 758 if (mss > mss_max)
759 759 mss = mss_max;
760 760
761 761 /* Note that this is the maximum MSS, excluding all options. */
762 762 tcp->tcp_mss = mss;
763 763
764 764 /*
765 765 * Update the tcp connection with LSO capability.
766 766 */
767 767 tcp_update_lso(tcp, connp->conn_ixa);
768 768
769 769 /*
770 770 * Initialize the ISS here now that we have the full connection ID.
771 771 * The RFC 1948 method of initial sequence number generation requires
772 772 * knowledge of the full connection ID before setting the ISS.
773 773 */
774 774 tcp_iss_init(tcp);
775 775
776 776 tcp->tcp_loopback = (uinfo.iulp_loopback | uinfo.iulp_local);
777 777
778 778 /*
779 779 * Make sure that conn is not marked incipient
780 780 * for incoming connections. A blind
781 781 * removal of incipient flag is cheaper than
782 782 * check and removal.
783 783 */
784 784 mutex_enter(&connp->conn_lock);
785 785 connp->conn_state_flags &= ~CONN_INCIPIENT;
786 786 mutex_exit(&connp->conn_lock);
787 787 return (0);
788 788 }
789 789
790 790 /*
791 791 * tcp_clean_death / tcp_close_detached must not be called more than once
792 792 * on a tcp. Thus every function that potentially calls tcp_clean_death
793 793 * must check for the tcp state before calling tcp_clean_death.
794 794 * Eg. tcp_input_data, tcp_eager_kill, tcp_clean_death_wrapper,
795 795 * tcp_timer_handler, all check for the tcp state.
796 796 */
797 797 /* ARGSUSED */
798 798 void
799 799 tcp_clean_death_wrapper(void *arg, mblk_t *mp, void *arg2,
800 800 ip_recv_attr_t *dummy)
801 801 {
802 802 tcp_t *tcp = ((conn_t *)arg)->conn_tcp;
803 803
804 804 freemsg(mp);
805 805 if (tcp->tcp_state > TCPS_BOUND)
806 806 (void) tcp_clean_death(((conn_t *)arg)->conn_tcp, ETIMEDOUT);
807 807 }
808 808
809 809 /*
810 810 * We are dying for some reason. Try to do it gracefully. (May be called
811 811 * as writer.)
812 812 *
813 813 * Return -1 if the structure was not cleaned up (if the cleanup had to be
814 814 * done by a service procedure).
815 815 * TBD - Should the return value distinguish between the tcp_t being
816 816 * freed and it being reinitialized?
817 817 */
818 818 int
819 819 tcp_clean_death(tcp_t *tcp, int err)
820 820 {
821 821 mblk_t *mp;
822 822 queue_t *q;
823 823 conn_t *connp = tcp->tcp_connp;
824 824 tcp_stack_t *tcps = tcp->tcp_tcps;
825 825
826 826 if (tcp->tcp_fused)
827 827 tcp_unfuse(tcp);
828 828
829 829 if (tcp->tcp_linger_tid != 0 &&
830 830 TCP_TIMER_CANCEL(tcp, tcp->tcp_linger_tid) >= 0) {
831 831 tcp_stop_lingering(tcp);
832 832 }
833 833
834 834 ASSERT(tcp != NULL);
835 835 ASSERT((connp->conn_family == AF_INET &&
836 836 connp->conn_ipversion == IPV4_VERSION) ||
837 837 (connp->conn_family == AF_INET6 &&
838 838 (connp->conn_ipversion == IPV4_VERSION ||
839 839 connp->conn_ipversion == IPV6_VERSION)));
840 840
841 841 if (TCP_IS_DETACHED(tcp)) {
842 842 if (tcp->tcp_hard_binding) {
843 843 /*
844 844 * Its an eager that we are dealing with. We close the
845 845 * eager but in case a conn_ind has already gone to the
846 846 * listener, let tcp_accept_finish() send a discon_ind
847 847 * to the listener and drop the last reference. If the
848 848 * listener doesn't even know about the eager i.e. the
849 849 * conn_ind hasn't gone up, blow away the eager and drop
850 850 * the last reference as well. If the conn_ind has gone
851 851 * up, state should be BOUND. tcp_accept_finish
852 852 * will figure out that the connection has received a
853 853 * RST and will send a DISCON_IND to the application.
854 854 */
855 855 tcp_closei_local(tcp);
856 856 if (!tcp->tcp_tconnind_started) {
857 857 CONN_DEC_REF(connp);
858 858 } else {
859 859 tcp->tcp_state = TCPS_BOUND;
860 860 DTRACE_TCP6(state__change, void, NULL,
861 861 ip_xmit_attr_t *, connp->conn_ixa,
862 862 void, NULL, tcp_t *, tcp, void, NULL,
863 863 int32_t, TCPS_CLOSED);
864 864 }
865 865 } else {
866 866 tcp_close_detached(tcp);
867 867 }
868 868 return (0);
869 869 }
870 870
871 871 TCP_STAT(tcps, tcp_clean_death_nondetached);
872 872
873 873 /*
874 874 * The connection is dead. Decrement listener connection counter if
875 875 * necessary.
876 876 */
877 877 if (tcp->tcp_listen_cnt != NULL)
878 878 TCP_DECR_LISTEN_CNT(tcp);
879 879
880 880 /*
881 881 * When a connection is moved to TIME_WAIT state, the connection
882 882 * counter is already decremented. So no need to decrement here
883 883 * again. See SET_TIME_WAIT() macro.
884 884 */
885 885 if (tcp->tcp_state >= TCPS_ESTABLISHED &&
886 886 tcp->tcp_state < TCPS_TIME_WAIT) {
887 887 TCPS_CONN_DEC(tcps);
888 888 }
889 889
890 890 q = connp->conn_rq;
891 891
892 892 /* Trash all inbound data */
893 893 if (!IPCL_IS_NONSTR(connp)) {
894 894 ASSERT(q != NULL);
895 895 flushq(q, FLUSHALL);
896 896 }
897 897
898 898 /*
899 899 * If we are at least part way open and there is error
900 900 * (err==0 implies no error)
901 901 * notify our client by a T_DISCON_IND.
902 902 */
903 903 if ((tcp->tcp_state >= TCPS_SYN_SENT) && err) {
904 904 if (tcp->tcp_state >= TCPS_ESTABLISHED &&
905 905 !TCP_IS_SOCKET(tcp)) {
906 906 /*
907 907 * Send M_FLUSH according to TPI. Because sockets will
908 908 * (and must) ignore FLUSHR we do that only for TPI
909 909 * endpoints and sockets in STREAMS mode.
910 910 */
911 911 (void) putnextctl1(q, M_FLUSH, FLUSHR);
912 912 }
913 913 if (connp->conn_debug) {
914 914 (void) strlog(TCP_MOD_ID, 0, 1, SL_TRACE|SL_ERROR,
915 915 "tcp_clean_death: discon err %d", err);
916 916 }
917 917 if (IPCL_IS_NONSTR(connp)) {
918 918 /* Direct socket, use upcall */
919 919 (*connp->conn_upcalls->su_disconnected)(
920 920 connp->conn_upper_handle, tcp->tcp_connid, err);
921 921 } else {
922 922 mp = mi_tpi_discon_ind(NULL, err, 0);
923 923 if (mp != NULL) {
924 924 putnext(q, mp);
925 925 } else {
926 926 if (connp->conn_debug) {
927 927 (void) strlog(TCP_MOD_ID, 0, 1,
928 928 SL_ERROR|SL_TRACE,
929 929 "tcp_clean_death, sending M_ERROR");
930 930 }
931 931 (void) putnextctl1(q, M_ERROR, EPROTO);
932 932 }
933 933 }
934 934 if (tcp->tcp_state <= TCPS_SYN_RCVD) {
935 935 /* SYN_SENT or SYN_RCVD */
936 936 TCPS_BUMP_MIB(tcps, tcpAttemptFails);
937 937 } else if (tcp->tcp_state <= TCPS_CLOSE_WAIT) {
938 938 /* ESTABLISHED or CLOSE_WAIT */
939 939 TCPS_BUMP_MIB(tcps, tcpEstabResets);
940 940 }
941 941 }
942 942
943 943 /*
944 944 * ESTABLISHED non-STREAMS eagers are not 'detached' because
945 945 * an upper handle is obtained when the SYN-ACK comes in. So it
946 946 * should receive the 'disconnected' upcall, but tcp_reinit should
947 947 * not be called since this is an eager.
948 948 */
949 949 if (tcp->tcp_listener != NULL && IPCL_IS_NONSTR(connp)) {
950 950 tcp_closei_local(tcp);
951 951 tcp->tcp_state = TCPS_BOUND;
952 952 DTRACE_TCP6(state__change, void, NULL, ip_xmit_attr_t *,
953 953 connp->conn_ixa, void, NULL, tcp_t *, tcp, void, NULL,
954 954 int32_t, TCPS_CLOSED);
955 955 return (0);
956 956 }
957 957
958 958 tcp_reinit(tcp);
959 959 if (IPCL_IS_NONSTR(connp))
960 960 (void) tcp_do_unbind(connp);
961 961
962 962 return (-1);
963 963 }
964 964
965 965 /*
966 966 * In case tcp is in the "lingering state" and waits for the SO_LINGER timeout
967 967 * to expire, stop the wait and finish the close.
968 968 */
969 969 void
970 970 tcp_stop_lingering(tcp_t *tcp)
971 971 {
972 972 clock_t delta = 0;
973 973 tcp_stack_t *tcps = tcp->tcp_tcps;
974 974 conn_t *connp = tcp->tcp_connp;
975 975
976 976 tcp->tcp_linger_tid = 0;
977 977 if (tcp->tcp_state > TCPS_LISTEN) {
978 978 tcp_acceptor_hash_remove(tcp);
979 979 mutex_enter(&tcp->tcp_non_sq_lock);
980 980 if (tcp->tcp_flow_stopped) {
981 981 tcp_clrqfull(tcp);
982 982 }
983 983 mutex_exit(&tcp->tcp_non_sq_lock);
984 984
985 985 if (tcp->tcp_timer_tid != 0) {
986 986 delta = TCP_TIMER_CANCEL(tcp, tcp->tcp_timer_tid);
987 987 tcp->tcp_timer_tid = 0;
988 988 }
989 989 /*
990 990 * Need to cancel those timers which will not be used when
991 991 * TCP is detached. This has to be done before the conn_wq
992 992 * is cleared.
993 993 */
994 994 tcp_timers_stop(tcp);
995 995
996 996 tcp->tcp_detached = B_TRUE;
997 997 connp->conn_rq = NULL;
998 998 connp->conn_wq = NULL;
999 999
1000 1000 if (tcp->tcp_state == TCPS_TIME_WAIT) {
1001 1001 tcp_time_wait_append(tcp);
1002 1002 TCP_DBGSTAT(tcps, tcp_detach_time_wait);
1003 1003 goto finish;
1004 1004 }
1005 1005
1006 1006 /*
1007 1007 * If delta is zero the timer event wasn't executed and was
1008 1008 * successfully canceled. In this case we need to restart it
1009 1009 * with the minimal delta possible.
1010 1010 */
1011 1011 if (delta >= 0) {
1012 1012 tcp->tcp_timer_tid = TCP_TIMER(tcp, tcp_timer,
1013 1013 delta ? delta : 1);
1014 1014 }
1015 1015 } else {
1016 1016 tcp_closei_local(tcp);
1017 1017 CONN_DEC_REF(connp);
1018 1018 }
1019 1019 finish:
1020 1020 tcp->tcp_detached = B_TRUE;
1021 1021 connp->conn_rq = NULL;
1022 1022 connp->conn_wq = NULL;
1023 1023
1024 1024 /* Signal closing thread that it can complete close */
1025 1025 mutex_enter(&tcp->tcp_closelock);
1026 1026 tcp->tcp_closed = 1;
1027 1027 cv_signal(&tcp->tcp_closecv);
1028 1028 mutex_exit(&tcp->tcp_closelock);
1029 1029
1030 1030 /* If we have an upper handle (socket), release it */
1031 1031 if (IPCL_IS_NONSTR(connp)) {
1032 1032 ASSERT(connp->conn_upper_handle != NULL);
1033 1033 (*connp->conn_upcalls->su_closed)(connp->conn_upper_handle);
1034 1034 connp->conn_upper_handle = NULL;
1035 1035 connp->conn_upcalls = NULL;
1036 1036 }
1037 1037 }
1038 1038
1039 1039 void
1040 1040 tcp_close_common(conn_t *connp, int flags)
1041 1041 {
1042 1042 tcp_t *tcp = connp->conn_tcp;
1043 1043 mblk_t *mp = &tcp->tcp_closemp;
1044 1044 boolean_t conn_ioctl_cleanup_reqd = B_FALSE;
1045 1045 mblk_t *bp;
1046 1046
1047 1047 ASSERT(connp->conn_ref >= 2);
1048 1048
1049 1049 /*
1050 1050 * Mark the conn as closing. ipsq_pending_mp_add will not
1051 1051 * add any mp to the pending mp list, after this conn has
1052 1052 * started closing.
1053 1053 */
1054 1054 mutex_enter(&connp->conn_lock);
1055 1055 connp->conn_state_flags |= CONN_CLOSING;
1056 1056 if (connp->conn_oper_pending_ill != NULL)
1057 1057 conn_ioctl_cleanup_reqd = B_TRUE;
1058 1058 CONN_INC_REF_LOCKED(connp);
1059 1059 mutex_exit(&connp->conn_lock);
1060 1060 tcp->tcp_closeflags = (uint8_t)flags;
1061 1061 ASSERT(connp->conn_ref >= 3);
1062 1062
1063 1063 /*
1064 1064 * tcp_closemp_used is used below without any protection of a lock
1065 1065 * as we don't expect any one else to use it concurrently at this
1066 1066 * point otherwise it would be a major defect.
1067 1067 */
1068 1068
1069 1069 if (mp->b_prev == NULL)
1070 1070 tcp->tcp_closemp_used = B_TRUE;
1071 1071 else
1072 1072 cmn_err(CE_PANIC, "tcp_close: concurrent use of tcp_closemp: "
1073 1073 "connp %p tcp %p\n", (void *)connp, (void *)tcp);
1074 1074
1075 1075 TCP_DEBUG_GETPCSTACK(tcp->tcmp_stk, 15);
1076 1076
1077 1077 /*
1078 1078 * Cleanup any queued ioctls here. This must be done before the wq/rq
1079 1079 * are re-written by tcp_close_output().
1080 1080 */
1081 1081 if (conn_ioctl_cleanup_reqd)
1082 1082 conn_ioctl_cleanup(connp);
1083 1083
1084 1084 /*
1085 1085 * As CONN_CLOSING is set, no further ioctls should be passed down to
1086 1086 * IP for this conn (see the guards in tcp_ioctl, tcp_wput_ioctl and
1087 1087 * tcp_wput_iocdata). If the ioctl was queued on an ipsq,
1088 1088 * conn_ioctl_cleanup should have found it and removed it. If the ioctl
1089 1089 * was still in flight at the time, we wait for it here. See comments
1090 1090 * for CONN_INC_IOCTLREF in ip.h for details.
1091 1091 */
1092 1092 mutex_enter(&connp->conn_lock);
1093 1093 while (connp->conn_ioctlref > 0)
1094 1094 cv_wait(&connp->conn_cv, &connp->conn_lock);
1095 1095 ASSERT(connp->conn_ioctlref == 0);
1096 1096 ASSERT(connp->conn_oper_pending_ill == NULL);
1097 1097 mutex_exit(&connp->conn_lock);
1098 1098
1099 1099 SQUEUE_ENTER_ONE(connp->conn_sqp, mp, tcp_close_output, connp,
1100 1100 NULL, tcp_squeue_flag, SQTAG_IP_TCP_CLOSE);
1101 1101
1102 1102 /*
1103 1103 * For non-STREAMS sockets, the normal case is that the conn makes
1104 1104 * an upcall when it's finally closed, so there is no need to wait
1105 1105 * in the protocol. But in case of SO_LINGER the thread sleeps here
1106 1106 * so it can properly deal with the thread being interrupted.
1107 1107 */
1108 1108 if (IPCL_IS_NONSTR(connp) && connp->conn_linger == 0)
1109 1109 goto nowait;
1110 1110
1111 1111 mutex_enter(&tcp->tcp_closelock);
1112 1112 while (!tcp->tcp_closed) {
1113 1113 if (!cv_wait_sig(&tcp->tcp_closecv, &tcp->tcp_closelock)) {
1114 1114 /*
1115 1115 * The cv_wait_sig() was interrupted. We now do the
1116 1116 * following:
1117 1117 *
1118 1118 * 1) If the endpoint was lingering, we allow this
1119 1119 * to be interrupted by cancelling the linger timeout
1120 1120 * and closing normally.
1121 1121 *
1122 1122 * 2) Revert to calling cv_wait()
1123 1123 *
1124 1124 * We revert to using cv_wait() to avoid an
1125 1125 * infinite loop which can occur if the calling
1126 1126 * thread is higher priority than the squeue worker
1127 1127 * thread and is bound to the same cpu.
1128 1128 */
1129 1129 if (connp->conn_linger && connp->conn_lingertime > 0) {
1130 1130 mutex_exit(&tcp->tcp_closelock);
1131 1131 /* Entering squeue, bump ref count. */
1132 1132 CONN_INC_REF(connp);
1133 1133 bp = allocb_wait(0, BPRI_HI, STR_NOSIG, NULL);
1134 1134 SQUEUE_ENTER_ONE(connp->conn_sqp, bp,
1135 1135 tcp_linger_interrupted, connp, NULL,
1136 1136 tcp_squeue_flag, SQTAG_IP_TCP_CLOSE);
1137 1137 mutex_enter(&tcp->tcp_closelock);
1138 1138 }
1139 1139 break;
1140 1140 }
1141 1141 }
1142 1142 while (!tcp->tcp_closed)
1143 1143 cv_wait(&tcp->tcp_closecv, &tcp->tcp_closelock);
1144 1144 mutex_exit(&tcp->tcp_closelock);
1145 1145
1146 1146 /*
1147 1147 * In the case of listener streams that have eagers in the q or q0
1148 1148 * we wait for the eagers to drop their reference to us. conn_rq and
1149 1149 * conn_wq of the eagers point to our queues. By waiting for the
1150 1150 * refcnt to drop to 1, we are sure that the eagers have cleaned
1151 1151 * up their queue pointers and also dropped their references to us.
1152 1152 *
1153 1153 * For non-STREAMS sockets we do not have to wait here; the
1154 1154 * listener will instead make a su_closed upcall when the last
1155 1155 * reference is dropped.
1156 1156 */
1157 1157 if (tcp->tcp_wait_for_eagers && !IPCL_IS_NONSTR(connp)) {
1158 1158 mutex_enter(&connp->conn_lock);
1159 1159 while (connp->conn_ref != 1) {
1160 1160 cv_wait(&connp->conn_cv, &connp->conn_lock);
1161 1161 }
1162 1162 mutex_exit(&connp->conn_lock);
1163 1163 }
1164 1164
1165 1165 nowait:
1166 1166 connp->conn_cpid = NOPID;
1167 1167 }
1168 1168
1169 1169 /*
1170 1170 * Called by tcp_close() routine via squeue when lingering is
1171 1171 * interrupted by a signal.
1172 1172 */
1173 1173
1174 1174 /* ARGSUSED */
1175 1175 static void
1176 1176 tcp_linger_interrupted(void *arg, mblk_t *mp, void *arg2, ip_recv_attr_t *dummy)
1177 1177 {
1178 1178 conn_t *connp = (conn_t *)arg;
1179 1179 tcp_t *tcp = connp->conn_tcp;
1180 1180
1181 1181 freeb(mp);
1182 1182 if (tcp->tcp_linger_tid != 0 &&
1183 1183 TCP_TIMER_CANCEL(tcp, tcp->tcp_linger_tid) >= 0) {
1184 1184 tcp_stop_lingering(tcp);
1185 1185 tcp->tcp_client_errno = EINTR;
1186 1186 }
1187 1187 }
1188 1188
1189 1189 /*
1190 1190 * Clean up the b_next and b_prev fields of every mblk pointed at by *mpp.
1191 1191 * Some stream heads get upset if they see these later on as anything but NULL.
1192 1192 */
1193 1193 void
1194 1194 tcp_close_mpp(mblk_t **mpp)
1195 1195 {
1196 1196 mblk_t *mp;
1197 1197
1198 1198 if ((mp = *mpp) != NULL) {
1199 1199 do {
1200 1200 mp->b_next = NULL;
1201 1201 mp->b_prev = NULL;
1202 1202 } while ((mp = mp->b_cont) != NULL);
1203 1203
1204 1204 mp = *mpp;
1205 1205 *mpp = NULL;
1206 1206 freemsg(mp);
1207 1207 }
1208 1208 }
1209 1209
1210 1210 /* Do detached close. */
1211 1211 void
1212 1212 tcp_close_detached(tcp_t *tcp)
1213 1213 {
1214 1214 if (tcp->tcp_fused)
1215 1215 tcp_unfuse(tcp);
1216 1216
1217 1217 /*
1218 1218 * Clustering code serializes TCP disconnect callbacks and
1219 1219 * cluster tcp list walks by blocking a TCP disconnect callback
1220 1220 * if a cluster tcp list walk is in progress. This ensures
1221 1221 * accurate accounting of TCPs in the cluster code even though
1222 1222 * the TCP list walk itself is not atomic.
1223 1223 */
1224 1224 tcp_closei_local(tcp);
1225 1225 CONN_DEC_REF(tcp->tcp_connp);
1226 1226 }
1227 1227
1228 1228 /*
1229 1229 * The tcp_t is going away. Remove it from all lists and set it
1230 1230 * to TCPS_CLOSED. The freeing up of memory is deferred until
1231 1231 * tcp_inactive. This is needed since a thread in tcp_rput might have
1232 1232 * done a CONN_INC_REF on this structure before it was removed from the
1233 1233 * hashes.
1234 1234 */
1235 1235 void
1236 1236 tcp_closei_local(tcp_t *tcp)
1237 1237 {
1238 1238 conn_t *connp = tcp->tcp_connp;
1239 1239 tcp_stack_t *tcps = tcp->tcp_tcps;
1240 1240 int32_t oldstate;
1241 1241
1242 1242 if (!TCP_IS_SOCKET(tcp))
1243 1243 tcp_acceptor_hash_remove(tcp);
1244 1244
1245 1245 TCPS_UPDATE_MIB(tcps, tcpHCInSegs, tcp->tcp_ibsegs);
1246 1246 tcp->tcp_ibsegs = 0;
1247 1247 TCPS_UPDATE_MIB(tcps, tcpHCOutSegs, tcp->tcp_obsegs);
1248 1248 tcp->tcp_obsegs = 0;
1249 1249
1250 1250 /*
1251 1251 * This can be called via tcp_time_wait_processing() if TCP gets a
1252 1252 * SYN with sequence number outside the TIME-WAIT connection's
1253 1253 * window. So we need to check for TIME-WAIT state here as the
1254 1254 * connection counter is already decremented. See SET_TIME_WAIT()
1255 1255 * macro
1256 1256 */
1257 1257 if (tcp->tcp_state >= TCPS_ESTABLISHED &&
1258 1258 tcp->tcp_state < TCPS_TIME_WAIT) {
1259 1259 TCPS_CONN_DEC(tcps);
1260 1260 }
1261 1261
1262 1262 /*
1263 1263 * If we are an eager connection hanging off a listener that
1264 1264 * hasn't formally accepted the connection yet, get off his
1265 1265 * list and blow off any data that we have accumulated.
1266 1266 */
1267 1267 if (tcp->tcp_listener != NULL) {
1268 1268 tcp_t *listener = tcp->tcp_listener;
1269 1269 mutex_enter(&listener->tcp_eager_lock);
1270 1270 /*
1271 1271 * tcp_tconnind_started == B_TRUE means that the
1272 1272 * conn_ind has already gone to listener. At
1273 1273 * this point, eager will be closed but we
1274 1274 * leave it in listeners eager list so that
1275 1275 * if listener decides to close without doing
1276 1276 * accept, we can clean this up. In tcp_tli_accept
1277 1277 * we take care of the case of accept on closed
1278 1278 * eager.
1279 1279 */
1280 1280 if (!tcp->tcp_tconnind_started) {
1281 1281 tcp_eager_unlink(tcp);
1282 1282 mutex_exit(&listener->tcp_eager_lock);
1283 1283 /*
1284 1284 * We don't want to have any pointers to the
1285 1285 * listener queue, after we have released our
1286 1286 * reference on the listener
1287 1287 */
1288 1288 ASSERT(tcp->tcp_detached);
1289 1289 connp->conn_rq = NULL;
1290 1290 connp->conn_wq = NULL;
1291 1291 CONN_DEC_REF(listener->tcp_connp);
1292 1292 } else {
1293 1293 mutex_exit(&listener->tcp_eager_lock);
1294 1294 }
1295 1295 }
1296 1296
1297 1297 /* Stop all the timers */
1298 1298 tcp_timers_stop(tcp);
1299 1299
1300 1300 if (tcp->tcp_state == TCPS_LISTEN) {
1301 1301 if (tcp->tcp_ip_addr_cache) {
1302 1302 kmem_free((void *)tcp->tcp_ip_addr_cache,
1303 1303 IP_ADDR_CACHE_SIZE * sizeof (ipaddr_t));
1304 1304 tcp->tcp_ip_addr_cache = NULL;
1305 1305 }
1306 1306 }
1307 1307
1308 1308 /* Decrement listerner connection counter if necessary. */
1309 1309 if (tcp->tcp_listen_cnt != NULL)
1310 1310 TCP_DECR_LISTEN_CNT(tcp);
1311 1311
1312 1312 mutex_enter(&tcp->tcp_non_sq_lock);
1313 1313 if (tcp->tcp_flow_stopped)
1314 1314 tcp_clrqfull(tcp);
1315 1315 mutex_exit(&tcp->tcp_non_sq_lock);
1316 1316
1317 1317 tcp_bind_hash_remove(tcp);
1318 1318 /*
1319 1319 * If the tcp_time_wait_collector (which runs outside the squeue)
1320 1320 * is trying to remove this tcp from the time wait list, we will
1321 1321 * block in tcp_time_wait_remove while trying to acquire the
1322 1322 * tcp_time_wait_lock. The logic in tcp_time_wait_collector also
1323 1323 * requires the ipcl_hash_remove to be ordered after the
1324 1324 * tcp_time_wait_remove for the refcnt checks to work correctly.
1325 1325 */
1326 1326 if (tcp->tcp_state == TCPS_TIME_WAIT)
1327 1327 (void) tcp_time_wait_remove(tcp, NULL);
1328 1328 CL_INET_DISCONNECT(connp);
1329 1329 ipcl_hash_remove(connp);
1330 1330 oldstate = tcp->tcp_state;
1331 1331 tcp->tcp_state = TCPS_CLOSED;
1332 1332 /* Need to probe before ixa_cleanup() is called */
1333 1333 DTRACE_TCP6(state__change, void, NULL, ip_xmit_attr_t *,
1334 1334 connp->conn_ixa, void, NULL, tcp_t *, tcp, void, NULL,
1335 1335 int32_t, oldstate);
1336 1336 ixa_cleanup(connp->conn_ixa);
1337 1337
1338 1338 /*
1339 1339 * Mark the conn as CONDEMNED
1340 1340 */
1341 1341 mutex_enter(&connp->conn_lock);
1342 1342 connp->conn_state_flags |= CONN_CONDEMNED;
1343 1343 mutex_exit(&connp->conn_lock);
1344 1344
1345 1345 ASSERT(tcp->tcp_time_wait_next == NULL);
1346 1346 ASSERT(tcp->tcp_time_wait_prev == NULL);
1347 1347 ASSERT(tcp->tcp_time_wait_expire == 0);
1348 1348
1349 1349 tcp_ipsec_cleanup(tcp);
1350 1350 }
1351 1351
1352 1352 /*
1353 1353 * tcp is dying (called from ipcl_conn_destroy and error cases).
1354 1354 * Free the tcp_t in either case.
1355 1355 */
1356 1356 void
1357 1357 tcp_free(tcp_t *tcp)
1358 1358 {
1359 1359 mblk_t *mp;
1360 1360 conn_t *connp = tcp->tcp_connp;
1361 1361
1362 1362 ASSERT(tcp != NULL);
1363 1363 ASSERT(tcp->tcp_ptpahn == NULL && tcp->tcp_acceptor_hash == NULL);
1364 1364
1365 1365 connp->conn_rq = NULL;
1366 1366 connp->conn_wq = NULL;
1367 1367
1368 1368 tcp_close_mpp(&tcp->tcp_xmit_head);
1369 1369 tcp_close_mpp(&tcp->tcp_reass_head);
1370 1370 if (tcp->tcp_rcv_list != NULL) {
1371 1371 /* Free b_next chain */
1372 1372 tcp_close_mpp(&tcp->tcp_rcv_list);
1373 1373 }
1374 1374 if ((mp = tcp->tcp_urp_mp) != NULL) {
1375 1375 freemsg(mp);
1376 1376 }
1377 1377 if ((mp = tcp->tcp_urp_mark_mp) != NULL) {
1378 1378 freemsg(mp);
1379 1379 }
1380 1380
1381 1381 if (tcp->tcp_fused_sigurg_mp != NULL) {
1382 1382 ASSERT(!IPCL_IS_NONSTR(tcp->tcp_connp));
1383 1383 freeb(tcp->tcp_fused_sigurg_mp);
1384 1384 tcp->tcp_fused_sigurg_mp = NULL;
1385 1385 }
1386 1386
1387 1387 if (tcp->tcp_ordrel_mp != NULL) {
1388 1388 ASSERT(!IPCL_IS_NONSTR(tcp->tcp_connp));
1389 1389 freeb(tcp->tcp_ordrel_mp);
1390 1390 tcp->tcp_ordrel_mp = NULL;
1391 1391 }
1392 1392
1393 1393 TCP_NOTSACK_REMOVE_ALL(tcp->tcp_notsack_list, tcp);
1394 1394 bzero(&tcp->tcp_sack_info, sizeof (tcp_sack_info_t));
1395 1395
1396 1396 if (tcp->tcp_hopopts != NULL) {
1397 1397 mi_free(tcp->tcp_hopopts);
1398 1398 tcp->tcp_hopopts = NULL;
1399 1399 tcp->tcp_hopoptslen = 0;
1400 1400 }
1401 1401 ASSERT(tcp->tcp_hopoptslen == 0);
1402 1402 if (tcp->tcp_dstopts != NULL) {
1403 1403 mi_free(tcp->tcp_dstopts);
1404 1404 tcp->tcp_dstopts = NULL;
1405 1405 tcp->tcp_dstoptslen = 0;
1406 1406 }
1407 1407 ASSERT(tcp->tcp_dstoptslen == 0);
1408 1408 if (tcp->tcp_rthdrdstopts != NULL) {
1409 1409 mi_free(tcp->tcp_rthdrdstopts);
1410 1410 tcp->tcp_rthdrdstopts = NULL;
1411 1411 tcp->tcp_rthdrdstoptslen = 0;
1412 1412 }
1413 1413 ASSERT(tcp->tcp_rthdrdstoptslen == 0);
1414 1414 if (tcp->tcp_rthdr != NULL) {
1415 1415 mi_free(tcp->tcp_rthdr);
1416 1416 tcp->tcp_rthdr = NULL;
1417 1417 tcp->tcp_rthdrlen = 0;
1418 1418 }
1419 1419 ASSERT(tcp->tcp_rthdrlen == 0);
1420 1420
1421 1421 /*
1422 1422 * Following is really a blowing away a union.
1423 1423 * It happens to have exactly two members of identical size
1424 1424 * the following code is enough.
1425 1425 */
1426 1426 tcp_close_mpp(&tcp->tcp_conn.tcp_eager_conn_ind);
1427 1427
1428 1428 /*
1429 1429 * If this is a non-STREAM socket still holding on to an upper
1430 1430 * handle, release it. As a result of fallback we might also see
1431 1431 * STREAMS based conns with upper handles, in which case there is
1432 1432 * nothing to do other than clearing the field.
1433 1433 */
1434 1434 if (connp->conn_upper_handle != NULL) {
1435 1435 if (IPCL_IS_NONSTR(connp)) {
1436 1436 (*connp->conn_upcalls->su_closed)(
1437 1437 connp->conn_upper_handle);
1438 1438 tcp->tcp_detached = B_TRUE;
1439 1439 }
1440 1440 connp->conn_upper_handle = NULL;
1441 1441 connp->conn_upcalls = NULL;
1442 1442 }
1443 1443 }
1444 1444
1445 1445 /*
1446 1446 * tcp_get_conn/tcp_free_conn
1447 1447 *
1448 1448 * tcp_get_conn is used to get a clean tcp connection structure.
1449 1449 * It tries to reuse the connections put on the freelist by the
1450 1450 * time_wait_collector failing which it goes to kmem_cache. This
1451 1451 * way has two benefits compared to just allocating from and
1452 1452 * freeing to kmem_cache.
1453 1453 * 1) The time_wait_collector can free (which includes the cleanup)
1454 1454 * outside the squeue. So when the interrupt comes, we have a clean
1455 1455 * connection sitting in the freelist. Obviously, this buys us
1456 1456 * performance.
1457 1457 *
1458 1458 * 2) Defence against DOS attack. Allocating a tcp/conn in tcp_input_listener
1459 1459 * has multiple disadvantages - tying up the squeue during alloc.
1460 1460 * But allocating the conn/tcp in IP land is also not the best since
1461 1461 * we can't check the 'q' and 'q0' which are protected by squeue and
1462 1462 * blindly allocate memory which might have to be freed here if we are
1463 1463 * not allowed to accept the connection. By using the freelist and
1464 1464 * putting the conn/tcp back in freelist, we don't pay a penalty for
1465 1465 * allocating memory without checking 'q/q0' and freeing it if we can't
1466 1466 * accept the connection.
1467 1467 *
1468 1468 * Care should be taken to put the conn back in the same squeue's freelist
1469 1469 * from which it was allocated. Best results are obtained if conn is
1470 1470 * allocated from listener's squeue and freed to the same. Time wait
1471 1471 * collector will free up the freelist is the connection ends up sitting
1472 1472 * there for too long.
1473 1473 */
1474 1474 void *
1475 1475 tcp_get_conn(void *arg, tcp_stack_t *tcps)
1476 1476 {
1477 1477 tcp_t *tcp = NULL;
1478 1478 conn_t *connp = NULL;
1479 1479 squeue_t *sqp = (squeue_t *)arg;
1480 1480 tcp_squeue_priv_t *tcp_time_wait;
1481 1481 netstack_t *ns;
1482 1482 mblk_t *tcp_rsrv_mp = NULL;
1483 1483
1484 1484 tcp_time_wait =
1485 1485 *((tcp_squeue_priv_t **)squeue_getprivate(sqp, SQPRIVATE_TCP));
1486 1486
1487 1487 mutex_enter(&tcp_time_wait->tcp_time_wait_lock);
1488 1488 tcp = tcp_time_wait->tcp_free_list;
1489 1489 ASSERT((tcp != NULL) ^ (tcp_time_wait->tcp_free_list_cnt == 0));
1490 1490 if (tcp != NULL) {
1491 1491 tcp_time_wait->tcp_free_list = tcp->tcp_time_wait_next;
1492 1492 tcp_time_wait->tcp_free_list_cnt--;
1493 1493 mutex_exit(&tcp_time_wait->tcp_time_wait_lock);
1494 1494 tcp->tcp_time_wait_next = NULL;
1495 1495 connp = tcp->tcp_connp;
1496 1496 connp->conn_flags |= IPCL_REUSED;
1497 1497
1498 1498 ASSERT(tcp->tcp_tcps == NULL);
1499 1499 ASSERT(connp->conn_netstack == NULL);
1500 1500 ASSERT(tcp->tcp_rsrv_mp != NULL);
1501 1501 ns = tcps->tcps_netstack;
1502 1502 netstack_hold(ns);
1503 1503 connp->conn_netstack = ns;
1504 1504 connp->conn_ixa->ixa_ipst = ns->netstack_ip;
1505 1505 tcp->tcp_tcps = tcps;
1506 1506 ipcl_globalhash_insert(connp);
1507 1507
1508 1508 connp->conn_ixa->ixa_notify_cookie = tcp;
1509 1509 ASSERT(connp->conn_ixa->ixa_notify == tcp_notify);
1510 1510 connp->conn_recv = tcp_input_data;
1511 1511 ASSERT(connp->conn_recvicmp == tcp_icmp_input);
1512 1512 ASSERT(connp->conn_verifyicmp == tcp_verifyicmp);
1513 1513 return ((void *)connp);
1514 1514 }
1515 1515 mutex_exit(&tcp_time_wait->tcp_time_wait_lock);
1516 1516 /*
1517 1517 * Pre-allocate the tcp_rsrv_mp. This mblk will not be freed until
1518 1518 * this conn_t/tcp_t is freed at ipcl_conn_destroy().
1519 1519 */
1520 1520 tcp_rsrv_mp = allocb(0, BPRI_HI);
1521 1521 if (tcp_rsrv_mp == NULL)
1522 1522 return (NULL);
1523 1523
1524 1524 if ((connp = ipcl_conn_create(IPCL_TCPCONN, KM_NOSLEEP,
1525 1525 tcps->tcps_netstack)) == NULL) {
1526 1526 freeb(tcp_rsrv_mp);
1527 1527 return (NULL);
1528 1528 }
1529 1529
1530 1530 tcp = connp->conn_tcp;
1531 1531 tcp->tcp_rsrv_mp = tcp_rsrv_mp;
1532 1532 mutex_init(&tcp->tcp_rsrv_mp_lock, NULL, MUTEX_DEFAULT, NULL);
1533 1533
1534 1534 tcp->tcp_tcps = tcps;
1535 1535
1536 1536 connp->conn_recv = tcp_input_data;
1537 1537 connp->conn_recvicmp = tcp_icmp_input;
1538 1538 connp->conn_verifyicmp = tcp_verifyicmp;
1539 1539
1540 1540 /*
1541 1541 * Register tcp_notify to listen to capability changes detected by IP.
1542 1542 * This upcall is made in the context of the call to conn_ip_output
1543 1543 * thus it is inside the squeue.
1544 1544 */
1545 1545 connp->conn_ixa->ixa_notify = tcp_notify;
1546 1546 connp->conn_ixa->ixa_notify_cookie = tcp;
1547 1547
1548 1548 return ((void *)connp);
1549 1549 }
1550 1550
1551 1551 /*
1552 1552 * Handle connect to IPv4 destinations, including connections for AF_INET6
1553 1553 * sockets connecting to IPv4 mapped IPv6 destinations.
1554 1554 * Returns zero if OK, a positive errno, or a negative TLI error.
1555 1555 */
1556 1556 static int
1557 1557 tcp_connect_ipv4(tcp_t *tcp, ipaddr_t *dstaddrp, in_port_t dstport,
1558 1558 uint_t srcid)
1559 1559 {
1560 1560 ipaddr_t dstaddr = *dstaddrp;
1561 1561 uint16_t lport;
1562 1562 conn_t *connp = tcp->tcp_connp;
1563 1563 tcp_stack_t *tcps = tcp->tcp_tcps;
1564 1564 int error;
1565 1565
1566 1566 ASSERT(connp->conn_ipversion == IPV4_VERSION);
1567 1567
1568 1568 /* Check for attempt to connect to INADDR_ANY */
1569 1569 if (dstaddr == INADDR_ANY) {
1570 1570 /*
1571 1571 * SunOS 4.x and 4.3 BSD allow an application
1572 1572 * to connect a TCP socket to INADDR_ANY.
1573 1573 * When they do this, the kernel picks the
1574 1574 * address of one interface and uses it
1575 1575 * instead. The kernel usually ends up
1576 1576 * picking the address of the loopback
1577 1577 * interface. This is an undocumented feature.
1578 1578 * However, we provide the same thing here
1579 1579 * in order to have source and binary
1580 1580 * compatibility with SunOS 4.x.
1581 1581 * Update the T_CONN_REQ (sin/sin6) since it is used to
1582 1582 * generate the T_CONN_CON.
1583 1583 */
1584 1584 dstaddr = htonl(INADDR_LOOPBACK);
1585 1585 *dstaddrp = dstaddr;
1586 1586 }
1587 1587
1588 1588 /* Handle __sin6_src_id if socket not bound to an IP address */
1589 1589 if (srcid != 0 && connp->conn_laddr_v4 == INADDR_ANY) {
1590 1590 ip_srcid_find_id(srcid, &connp->conn_laddr_v6,
1591 1591 IPCL_ZONEID(connp), tcps->tcps_netstack);
1592 1592 connp->conn_saddr_v6 = connp->conn_laddr_v6;
1593 1593 }
1594 1594
1595 1595 IN6_IPADDR_TO_V4MAPPED(dstaddr, &connp->conn_faddr_v6);
1596 1596 connp->conn_fport = dstport;
1597 1597
1598 1598 /*
1599 1599 * At this point the remote destination address and remote port fields
1600 1600 * in the tcp-four-tuple have been filled in the tcp structure. Now we
1601 1601 * have to see which state tcp was in so we can take appropriate action.
1602 1602 */
1603 1603 if (tcp->tcp_state == TCPS_IDLE) {
1604 1604 /*
1605 1605 * We support a quick connect capability here, allowing
1606 1606 * clients to transition directly from IDLE to SYN_SENT
1607 1607 * tcp_bindi will pick an unused port, insert the connection
1608 1608 * in the bind hash and transition to BOUND state.
1609 1609 */
1610 1610 lport = tcp_update_next_port(tcps->tcps_next_port_to_try,
1611 1611 tcp, B_TRUE);
1612 1612 lport = tcp_bindi(tcp, lport, &connp->conn_laddr_v6, 0, B_TRUE,
1613 1613 B_FALSE, B_FALSE);
1614 1614 if (lport == 0)
1615 1615 return (-TNOADDR);
1616 1616 }
1617 1617
1618 1618 /*
1619 1619 * Lookup the route to determine a source address and the uinfo.
1620 1620 * Setup TCP parameters based on the metrics/DCE.
1621 1621 */
1622 1622 error = tcp_set_destination(tcp);
1623 1623 if (error != 0)
1624 1624 return (error);
1625 1625
1626 1626 /*
1627 1627 * Don't let an endpoint connect to itself.
1628 1628 */
1629 1629 if (connp->conn_faddr_v4 == connp->conn_laddr_v4 &&
1630 1630 connp->conn_fport == connp->conn_lport)
1631 1631 return (-TBADADDR);
1632 1632
1633 1633 tcp->tcp_state = TCPS_SYN_SENT;
1634 1634
1635 1635 return (ipcl_conn_insert_v4(connp));
1636 1636 }
1637 1637
1638 1638 /*
1639 1639 * Handle connect to IPv6 destinations.
1640 1640 * Returns zero if OK, a positive errno, or a negative TLI error.
1641 1641 */
1642 1642 static int
1643 1643 tcp_connect_ipv6(tcp_t *tcp, in6_addr_t *dstaddrp, in_port_t dstport,
1644 1644 uint32_t flowinfo, uint_t srcid, uint32_t scope_id)
1645 1645 {
1646 1646 uint16_t lport;
1647 1647 conn_t *connp = tcp->tcp_connp;
1648 1648 tcp_stack_t *tcps = tcp->tcp_tcps;
1649 1649 int error;
1650 1650
1651 1651 ASSERT(connp->conn_family == AF_INET6);
1652 1652
1653 1653 /*
1654 1654 * If we're here, it means that the destination address is a native
1655 1655 * IPv6 address. Return an error if conn_ipversion is not IPv6. A
1656 1656 * reason why it might not be IPv6 is if the socket was bound to an
1657 1657 * IPv4-mapped IPv6 address.
1658 1658 */
1659 1659 if (connp->conn_ipversion != IPV6_VERSION)
1660 1660 return (-TBADADDR);
1661 1661
1662 1662 /*
1663 1663 * Interpret a zero destination to mean loopback.
1664 1664 * Update the T_CONN_REQ (sin/sin6) since it is used to
1665 1665 * generate the T_CONN_CON.
1666 1666 */
1667 1667 if (IN6_IS_ADDR_UNSPECIFIED(dstaddrp))
1668 1668 *dstaddrp = ipv6_loopback;
1669 1669
1670 1670 /* Handle __sin6_src_id if socket not bound to an IP address */
1671 1671 if (srcid != 0 && IN6_IS_ADDR_UNSPECIFIED(&connp->conn_laddr_v6)) {
1672 1672 ip_srcid_find_id(srcid, &connp->conn_laddr_v6,
1673 1673 IPCL_ZONEID(connp), tcps->tcps_netstack);
1674 1674 connp->conn_saddr_v6 = connp->conn_laddr_v6;
1675 1675 }
1676 1676
1677 1677 /*
1678 1678 * Take care of the scope_id now.
1679 1679 */
1680 1680 if (scope_id != 0 && IN6_IS_ADDR_LINKSCOPE(dstaddrp)) {
1681 1681 connp->conn_ixa->ixa_flags |= IXAF_SCOPEID_SET;
1682 1682 connp->conn_ixa->ixa_scopeid = scope_id;
1683 1683 } else {
1684 1684 connp->conn_ixa->ixa_flags &= ~IXAF_SCOPEID_SET;
1685 1685 }
1686 1686
1687 1687 connp->conn_flowinfo = flowinfo;
1688 1688 connp->conn_faddr_v6 = *dstaddrp;
1689 1689 connp->conn_fport = dstport;
1690 1690
1691 1691 /*
1692 1692 * At this point the remote destination address and remote port fields
1693 1693 * in the tcp-four-tuple have been filled in the tcp structure. Now we
1694 1694 * have to see which state tcp was in so we can take appropriate action.
1695 1695 */
1696 1696 if (tcp->tcp_state == TCPS_IDLE) {
1697 1697 /*
1698 1698 * We support a quick connect capability here, allowing
1699 1699 * clients to transition directly from IDLE to SYN_SENT
1700 1700 * tcp_bindi will pick an unused port, insert the connection
1701 1701 * in the bind hash and transition to BOUND state.
1702 1702 */
1703 1703 lport = tcp_update_next_port(tcps->tcps_next_port_to_try,
1704 1704 tcp, B_TRUE);
1705 1705 lport = tcp_bindi(tcp, lport, &connp->conn_laddr_v6, 0, B_TRUE,
1706 1706 B_FALSE, B_FALSE);
1707 1707 if (lport == 0)
1708 1708 return (-TNOADDR);
1709 1709 }
1710 1710
1711 1711 /*
1712 1712 * Lookup the route to determine a source address and the uinfo.
1713 1713 * Setup TCP parameters based on the metrics/DCE.
1714 1714 */
1715 1715 error = tcp_set_destination(tcp);
1716 1716 if (error != 0)
1717 1717 return (error);
1718 1718
1719 1719 /*
1720 1720 * Don't let an endpoint connect to itself.
1721 1721 */
1722 1722 if (IN6_ARE_ADDR_EQUAL(&connp->conn_faddr_v6, &connp->conn_laddr_v6) &&
1723 1723 connp->conn_fport == connp->conn_lport)
1724 1724 return (-TBADADDR);
1725 1725
1726 1726 tcp->tcp_state = TCPS_SYN_SENT;
1727 1727
1728 1728 return (ipcl_conn_insert_v6(connp));
1729 1729 }
1730 1730
1731 1731 /*
1732 1732 * Disconnect
1733 1733 * Note that unlike other functions this returns a positive tli error
1734 1734 * when it fails; it never returns an errno.
1735 1735 */
1736 1736 static int
1737 1737 tcp_disconnect_common(tcp_t *tcp, t_scalar_t seqnum)
1738 1738 {
1739 1739 conn_t *lconnp;
1740 1740 tcp_stack_t *tcps = tcp->tcp_tcps;
1741 1741 conn_t *connp = tcp->tcp_connp;
1742 1742
1743 1743 /*
1744 1744 * Right now, upper modules pass down a T_DISCON_REQ to TCP,
1745 1745 * when the stream is in BOUND state. Do not send a reset,
1746 1746 * since the destination IP address is not valid, and it can
1747 1747 * be the initialized value of all zeros (broadcast address).
1748 1748 */
1749 1749 if (tcp->tcp_state <= TCPS_BOUND) {
1750 1750 if (connp->conn_debug) {
1751 1751 (void) strlog(TCP_MOD_ID, 0, 1, SL_ERROR|SL_TRACE,
1752 1752 "tcp_disconnect: bad state, %d", tcp->tcp_state);
1753 1753 }
1754 1754 return (TOUTSTATE);
1755 1755 } else if (tcp->tcp_state >= TCPS_ESTABLISHED) {
1756 1756 TCPS_CONN_DEC(tcps);
1757 1757 }
1758 1758
1759 1759 if (seqnum == -1 || tcp->tcp_conn_req_max == 0) {
1760 1760
1761 1761 /*
1762 1762 * According to TPI, for non-listeners, ignore seqnum
1763 1763 * and disconnect.
1764 1764 * Following interpretation of -1 seqnum is historical
1765 1765 * and implied TPI ? (TPI only states that for T_CONN_IND,
1766 1766 * a valid seqnum should not be -1).
1767 1767 *
1768 1768 * -1 means disconnect everything
1769 1769 * regardless even on a listener.
1770 1770 */
1771 1771
1772 1772 int old_state = tcp->tcp_state;
1773 1773 ip_stack_t *ipst = tcps->tcps_netstack->netstack_ip;
1774 1774
1775 1775 /*
1776 1776 * The connection can't be on the tcp_time_wait_head list
1777 1777 * since it is not detached.
1778 1778 */
1779 1779 ASSERT(tcp->tcp_time_wait_next == NULL);
1780 1780 ASSERT(tcp->tcp_time_wait_prev == NULL);
1781 1781 ASSERT(tcp->tcp_time_wait_expire == 0);
1782 1782 /*
1783 1783 * If it used to be a listener, check to make sure no one else
1784 1784 * has taken the port before switching back to LISTEN state.
1785 1785 */
1786 1786 if (connp->conn_ipversion == IPV4_VERSION) {
1787 1787 lconnp = ipcl_lookup_listener_v4(connp->conn_lport,
1788 1788 connp->conn_laddr_v4, IPCL_ZONEID(connp), ipst);
1789 1789 } else {
1790 1790 uint_t ifindex = 0;
1791 1791
1792 1792 if (connp->conn_ixa->ixa_flags & IXAF_SCOPEID_SET)
1793 1793 ifindex = connp->conn_ixa->ixa_scopeid;
1794 1794
1795 1795 /* Allow conn_bound_if listeners? */
1796 1796 lconnp = ipcl_lookup_listener_v6(connp->conn_lport,
1797 1797 &connp->conn_laddr_v6, ifindex, IPCL_ZONEID(connp),
1798 1798 ipst);
1799 1799 }
1800 1800 if (tcp->tcp_conn_req_max && lconnp == NULL) {
1801 1801 tcp->tcp_state = TCPS_LISTEN;
1802 1802 DTRACE_TCP6(state__change, void, NULL, ip_xmit_attr_t *,
1803 1803 connp->conn_ixa, void, NULL, tcp_t *, tcp, void,
1804 1804 NULL, int32_t, old_state);
1805 1805 } else if (old_state > TCPS_BOUND) {
1806 1806 tcp->tcp_conn_req_max = 0;
1807 1807 tcp->tcp_state = TCPS_BOUND;
1808 1808 DTRACE_TCP6(state__change, void, NULL, ip_xmit_attr_t *,
1809 1809 connp->conn_ixa, void, NULL, tcp_t *, tcp, void,
1810 1810 NULL, int32_t, old_state);
1811 1811
1812 1812 /*
1813 1813 * If this end point is not going to become a listener,
1814 1814 * decrement the listener connection count if
1815 1815 * necessary. Note that we do not do this if it is
1816 1816 * going to be a listner (the above if case) since
1817 1817 * then it may remove the counter struct.
1818 1818 */
1819 1819 if (tcp->tcp_listen_cnt != NULL)
1820 1820 TCP_DECR_LISTEN_CNT(tcp);
1821 1821 }
1822 1822 if (lconnp != NULL)
1823 1823 CONN_DEC_REF(lconnp);
1824 1824 switch (old_state) {
1825 1825 case TCPS_SYN_SENT:
1826 1826 case TCPS_SYN_RCVD:
1827 1827 TCPS_BUMP_MIB(tcps, tcpAttemptFails);
1828 1828 break;
1829 1829 case TCPS_ESTABLISHED:
1830 1830 case TCPS_CLOSE_WAIT:
1831 1831 TCPS_BUMP_MIB(tcps, tcpEstabResets);
1832 1832 break;
1833 1833 }
1834 1834
1835 1835 if (tcp->tcp_fused)
1836 1836 tcp_unfuse(tcp);
1837 1837
1838 1838 mutex_enter(&tcp->tcp_eager_lock);
1839 1839 if ((tcp->tcp_conn_req_cnt_q0 != 0) ||
1840 1840 (tcp->tcp_conn_req_cnt_q != 0)) {
1841 1841 tcp_eager_cleanup(tcp, 0);
1842 1842 }
1843 1843 mutex_exit(&tcp->tcp_eager_lock);
1844 1844
1845 1845 tcp_xmit_ctl("tcp_disconnect", tcp, tcp->tcp_snxt,
1846 1846 tcp->tcp_rnxt, TH_RST | TH_ACK);
1847 1847
1848 1848 tcp_reinit(tcp);
1849 1849
1850 1850 return (0);
1851 1851 } else if (!tcp_eager_blowoff(tcp, seqnum)) {
1852 1852 return (TBADSEQ);
1853 1853 }
1854 1854 return (0);
1855 1855 }
1856 1856
1857 1857 /*
1858 1858 * Our client hereby directs us to reject the connection request
1859 1859 * that tcp_input_listener() marked with 'seqnum'. Rejection consists
1860 1860 * of sending the appropriate RST, not an ICMP error.
1861 1861 */
1862 1862 void
1863 1863 tcp_disconnect(tcp_t *tcp, mblk_t *mp)
1864 1864 {
1865 1865 t_scalar_t seqnum;
1866 1866 int error;
1867 1867 conn_t *connp = tcp->tcp_connp;
1868 1868
1869 1869 ASSERT((uintptr_t)(mp->b_wptr - mp->b_rptr) <= (uintptr_t)INT_MAX);
1870 1870 if ((mp->b_wptr - mp->b_rptr) < sizeof (struct T_discon_req)) {
1871 1871 tcp_err_ack(tcp, mp, TPROTO, 0);
1872 1872 return;
1873 1873 }
1874 1874 seqnum = ((struct T_discon_req *)mp->b_rptr)->SEQ_number;
1875 1875 error = tcp_disconnect_common(tcp, seqnum);
1876 1876 if (error != 0)
1877 1877 tcp_err_ack(tcp, mp, error, 0);
1878 1878 else {
1879 1879 if (tcp->tcp_state >= TCPS_ESTABLISHED) {
1880 1880 /* Send M_FLUSH according to TPI */
1881 1881 (void) putnextctl1(connp->conn_rq, M_FLUSH, FLUSHRW);
1882 1882 }
1883 1883 mp = mi_tpi_ok_ack_alloc(mp);
1884 1884 if (mp != NULL)
1885 1885 putnext(connp->conn_rq, mp);
1886 1886 }
1887 1887 }
1888 1888
1889 1889 /*
1890 1890 * Handle reinitialization of a tcp structure.
1891 1891 * Maintain "binding state" resetting the state to BOUND, LISTEN, or IDLE.
1892 1892 */
1893 1893 static void
1894 1894 tcp_reinit(tcp_t *tcp)
1895 1895 {
1896 1896 mblk_t *mp;
1897 1897 tcp_stack_t *tcps = tcp->tcp_tcps;
1898 1898 conn_t *connp = tcp->tcp_connp;
1899 1899 int32_t oldstate;
1900 1900
1901 1901 /* tcp_reinit should never be called for detached tcp_t's */
1902 1902 ASSERT(tcp->tcp_listener == NULL);
1903 1903 ASSERT((connp->conn_family == AF_INET &&
1904 1904 connp->conn_ipversion == IPV4_VERSION) ||
1905 1905 (connp->conn_family == AF_INET6 &&
1906 1906 (connp->conn_ipversion == IPV4_VERSION ||
1907 1907 connp->conn_ipversion == IPV6_VERSION)));
1908 1908
1909 1909 /* Cancel outstanding timers */
1910 1910 tcp_timers_stop(tcp);
1911 1911
1912 1912 /*
1913 1913 * Reset everything in the state vector, after updating global
1914 1914 * MIB data from instance counters.
1915 1915 */
1916 1916 TCPS_UPDATE_MIB(tcps, tcpHCInSegs, tcp->tcp_ibsegs);
1917 1917 tcp->tcp_ibsegs = 0;
1918 1918 TCPS_UPDATE_MIB(tcps, tcpHCOutSegs, tcp->tcp_obsegs);
1919 1919 tcp->tcp_obsegs = 0;
1920 1920
1921 1921 tcp_close_mpp(&tcp->tcp_xmit_head);
1922 1922 if (tcp->tcp_snd_zcopy_aware)
1923 1923 tcp_zcopy_notify(tcp);
1924 1924 tcp->tcp_xmit_last = tcp->tcp_xmit_tail = NULL;
1925 1925 tcp->tcp_unsent = tcp->tcp_xmit_tail_unsent = 0;
1926 1926 mutex_enter(&tcp->tcp_non_sq_lock);
1927 1927 if (tcp->tcp_flow_stopped &&
1928 1928 TCP_UNSENT_BYTES(tcp) <= connp->conn_sndlowat) {
1929 1929 tcp_clrqfull(tcp);
1930 1930 }
1931 1931 mutex_exit(&tcp->tcp_non_sq_lock);
1932 1932 tcp_close_mpp(&tcp->tcp_reass_head);
1933 1933 tcp->tcp_reass_tail = NULL;
1934 1934 if (tcp->tcp_rcv_list != NULL) {
1935 1935 /* Free b_next chain */
1936 1936 tcp_close_mpp(&tcp->tcp_rcv_list);
1937 1937 tcp->tcp_rcv_last_head = NULL;
1938 1938 tcp->tcp_rcv_last_tail = NULL;
1939 1939 tcp->tcp_rcv_cnt = 0;
1940 1940 }
1941 1941 tcp->tcp_rcv_last_tail = NULL;
1942 1942
1943 1943 if ((mp = tcp->tcp_urp_mp) != NULL) {
1944 1944 freemsg(mp);
1945 1945 tcp->tcp_urp_mp = NULL;
1946 1946 }
1947 1947 if ((mp = tcp->tcp_urp_mark_mp) != NULL) {
1948 1948 freemsg(mp);
1949 1949 tcp->tcp_urp_mark_mp = NULL;
1950 1950 }
1951 1951 if (tcp->tcp_fused_sigurg_mp != NULL) {
1952 1952 ASSERT(!IPCL_IS_NONSTR(tcp->tcp_connp));
1953 1953 freeb(tcp->tcp_fused_sigurg_mp);
1954 1954 tcp->tcp_fused_sigurg_mp = NULL;
1955 1955 }
1956 1956 if (tcp->tcp_ordrel_mp != NULL) {
1957 1957 ASSERT(!IPCL_IS_NONSTR(tcp->tcp_connp));
1958 1958 freeb(tcp->tcp_ordrel_mp);
1959 1959 tcp->tcp_ordrel_mp = NULL;
1960 1960 }
1961 1961
1962 1962 /*
1963 1963 * Following is a union with two members which are
1964 1964 * identical types and size so the following cleanup
1965 1965 * is enough.
1966 1966 */
1967 1967 tcp_close_mpp(&tcp->tcp_conn.tcp_eager_conn_ind);
1968 1968
1969 1969 CL_INET_DISCONNECT(connp);
1970 1970
1971 1971 /*
1972 1972 * The connection can't be on the tcp_time_wait_head list
1973 1973 * since it is not detached.
1974 1974 */
1975 1975 ASSERT(tcp->tcp_time_wait_next == NULL);
1976 1976 ASSERT(tcp->tcp_time_wait_prev == NULL);
1977 1977 ASSERT(tcp->tcp_time_wait_expire == 0);
1978 1978
1979 1979 /*
1980 1980 * Reset/preserve other values
1981 1981 */
1982 1982 tcp_reinit_values(tcp);
1983 1983 ipcl_hash_remove(connp);
1984 1984 /* Note that ixa_cred gets cleared in ixa_cleanup */
1985 1985 ixa_cleanup(connp->conn_ixa);
1986 1986 tcp_ipsec_cleanup(tcp);
1987 1987
1988 1988 connp->conn_laddr_v6 = connp->conn_bound_addr_v6;
1989 1989 connp->conn_saddr_v6 = connp->conn_bound_addr_v6;
1990 1990 oldstate = tcp->tcp_state;
1991 1991
1992 1992 if (tcp->tcp_conn_req_max != 0) {
1993 1993 /*
1994 1994 * This is the case when a TLI program uses the same
1995 1995 * transport end point to accept a connection. This
1996 1996 * makes the TCP both a listener and acceptor. When
1997 1997 * this connection is closed, we need to set the state
1998 1998 * back to TCPS_LISTEN. Make sure that the eager list
1999 1999 * is reinitialized.
2000 2000 *
2001 2001 * Note that this stream is still bound to the four
2002 2002 * tuples of the previous connection in IP. If a new
2003 2003 * SYN with different foreign address comes in, IP will
2004 2004 * not find it and will send it to the global queue. In
2005 2005 * the global queue, TCP will do a tcp_lookup_listener()
2006 2006 * to find this stream. This works because this stream
2007 2007 * is only removed from connected hash.
2008 2008 *
2009 2009 */
2010 2010 tcp->tcp_state = TCPS_LISTEN;
2011 2011 tcp->tcp_eager_next_q0 = tcp->tcp_eager_prev_q0 = tcp;
2012 2012 tcp->tcp_eager_next_drop_q0 = tcp;
2013 2013 tcp->tcp_eager_prev_drop_q0 = tcp;
2014 2014 /*
2015 2015 * Initially set conn_recv to tcp_input_listener_unbound to try
2016 2016 * to pick a good squeue for the listener when the first SYN
2017 2017 * arrives. tcp_input_listener_unbound sets it to
2018 2018 * tcp_input_listener on that first SYN.
2019 2019 */
2020 2020 connp->conn_recv = tcp_input_listener_unbound;
2021 2021
2022 2022 connp->conn_proto = IPPROTO_TCP;
2023 2023 connp->conn_faddr_v6 = ipv6_all_zeros;
2024 2024 connp->conn_fport = 0;
2025 2025
2026 2026 (void) ipcl_bind_insert(connp);
2027 2027 } else {
2028 2028 tcp->tcp_state = TCPS_BOUND;
2029 2029 }
2030 2030
2031 2031 /*
2032 2032 * Initialize to default values
2033 2033 */
2034 2034 tcp_init_values(tcp, NULL);
2035 2035
2036 2036 DTRACE_TCP6(state__change, void, NULL, ip_xmit_attr_t *,
2037 2037 connp->conn_ixa, void, NULL, tcp_t *, tcp, void, NULL,
2038 2038 int32_t, oldstate);
2039 2039
2040 2040 ASSERT(tcp->tcp_ptpbhn != NULL);
2041 2041 tcp->tcp_rwnd = connp->conn_rcvbuf;
2042 2042 tcp->tcp_mss = connp->conn_ipversion != IPV4_VERSION ?
2043 2043 tcps->tcps_mss_def_ipv6 : tcps->tcps_mss_def_ipv4;
2044 2044 }
2045 2045
2046 2046 /*
2047 2047 * Force values to zero that need be zero.
2048 2048 * Do not touch values asociated with the BOUND or LISTEN state
2049 2049 * since the connection will end up in that state after the reinit.
2050 2050 * NOTE: tcp_reinit_values MUST have a line for each field in the tcp_t
2051 2051 * structure!
2052 2052 */
2053 2053 static void
2054 2054 tcp_reinit_values(tcp)
2055 2055 tcp_t *tcp;
2056 2056 {
2057 2057 tcp_stack_t *tcps = tcp->tcp_tcps;
2058 2058 conn_t *connp = tcp->tcp_connp;
2059 2059
2060 2060 #ifndef lint
2061 2061 #define DONTCARE(x)
2062 2062 #define PRESERVE(x)
2063 2063 #else
2064 2064 #define DONTCARE(x) ((x) = (x))
2065 2065 #define PRESERVE(x) ((x) = (x))
2066 2066 #endif /* lint */
2067 2067
2068 2068 PRESERVE(tcp->tcp_bind_hash_port);
2069 2069 PRESERVE(tcp->tcp_bind_hash);
2070 2070 PRESERVE(tcp->tcp_ptpbhn);
2071 2071 PRESERVE(tcp->tcp_acceptor_hash);
2072 2072 PRESERVE(tcp->tcp_ptpahn);
2073 2073
2074 2074 /* Should be ASSERT NULL on these with new code! */
2075 2075 ASSERT(tcp->tcp_time_wait_next == NULL);
2076 2076 ASSERT(tcp->tcp_time_wait_prev == NULL);
2077 2077 ASSERT(tcp->tcp_time_wait_expire == 0);
2078 2078 PRESERVE(tcp->tcp_state);
2079 2079 PRESERVE(connp->conn_rq);
2080 2080 PRESERVE(connp->conn_wq);
2081 2081
2082 2082 ASSERT(tcp->tcp_xmit_head == NULL);
2083 2083 ASSERT(tcp->tcp_xmit_last == NULL);
2084 2084 ASSERT(tcp->tcp_unsent == 0);
2085 2085 ASSERT(tcp->tcp_xmit_tail == NULL);
2086 2086 ASSERT(tcp->tcp_xmit_tail_unsent == 0);
2087 2087
2088 2088 tcp->tcp_snxt = 0; /* Displayed in mib */
2089 2089 tcp->tcp_suna = 0; /* Displayed in mib */
2090 2090 tcp->tcp_swnd = 0;
2091 2091 DONTCARE(tcp->tcp_cwnd); /* Init in tcp_process_options */
2092 2092
2093 2093 ASSERT(tcp->tcp_ibsegs == 0);
2094 2094 ASSERT(tcp->tcp_obsegs == 0);
2095 2095
2096 2096 if (connp->conn_ht_iphc != NULL) {
2097 2097 kmem_free(connp->conn_ht_iphc, connp->conn_ht_iphc_allocated);
2098 2098 connp->conn_ht_iphc = NULL;
2099 2099 connp->conn_ht_iphc_allocated = 0;
2100 2100 connp->conn_ht_iphc_len = 0;
2101 2101 connp->conn_ht_ulp = NULL;
2102 2102 connp->conn_ht_ulp_len = 0;
2103 2103 tcp->tcp_ipha = NULL;
2104 2104 tcp->tcp_ip6h = NULL;
2105 2105 tcp->tcp_tcpha = NULL;
2106 2106 }
2107 2107
2108 2108 /* We clear any IP_OPTIONS and extension headers */
2109 2109 ip_pkt_free(&connp->conn_xmit_ipp);
2110 2110
2111 2111 DONTCARE(tcp->tcp_naglim); /* Init in tcp_init_values */
2112 2112 DONTCARE(tcp->tcp_ipha);
2113 2113 DONTCARE(tcp->tcp_ip6h);
2114 2114 DONTCARE(tcp->tcp_tcpha);
2115 2115 tcp->tcp_valid_bits = 0;
2116 2116
2117 2117 DONTCARE(tcp->tcp_timer_backoff); /* Init in tcp_init_values */
2118 2118 DONTCARE(tcp->tcp_last_recv_time); /* Init in tcp_init_values */
2119 2119 tcp->tcp_last_rcv_lbolt = 0;
2120 2120
2121 2121 tcp->tcp_init_cwnd = 0;
2122 2122
2123 2123 tcp->tcp_urp_last_valid = 0;
2124 2124 tcp->tcp_hard_binding = 0;
2125 2125
2126 2126 tcp->tcp_fin_acked = 0;
2127 2127 tcp->tcp_fin_rcvd = 0;
2128 2128 tcp->tcp_fin_sent = 0;
2129 2129 tcp->tcp_ordrel_done = 0;
2130 2130
2131 2131 tcp->tcp_detached = 0;
2132 2132
2133 2133 tcp->tcp_snd_ws_ok = B_FALSE;
2134 2134 tcp->tcp_snd_ts_ok = B_FALSE;
2135 2135 tcp->tcp_zero_win_probe = 0;
2136 2136
2137 2137 tcp->tcp_loopback = 0;
2138 2138 tcp->tcp_localnet = 0;
2139 2139 tcp->tcp_syn_defense = 0;
2140 2140 tcp->tcp_set_timer = 0;
2141 2141
2142 2142 tcp->tcp_active_open = 0;
2143 2143 tcp->tcp_rexmit = B_FALSE;
2144 2144 tcp->tcp_xmit_zc_clean = B_FALSE;
2145 2145
2146 2146 tcp->tcp_snd_sack_ok = B_FALSE;
2147 2147 tcp->tcp_hwcksum = B_FALSE;
2148 2148
2149 2149 DONTCARE(tcp->tcp_maxpsz_multiplier); /* Init in tcp_init_values */
2150 2150
2151 2151 tcp->tcp_conn_def_q0 = 0;
2152 2152 tcp->tcp_ip_forward_progress = B_FALSE;
2153 2153 tcp->tcp_ecn_ok = B_FALSE;
2154 2154
2155 2155 tcp->tcp_cwr = B_FALSE;
2156 2156 tcp->tcp_ecn_echo_on = B_FALSE;
2157 2157 tcp->tcp_is_wnd_shrnk = B_FALSE;
2158 2158
2159 2159 TCP_NOTSACK_REMOVE_ALL(tcp->tcp_notsack_list, tcp);
2160 2160 bzero(&tcp->tcp_sack_info, sizeof (tcp_sack_info_t));
2161 2161
2162 2162 tcp->tcp_rcv_ws = 0;
2163 2163 tcp->tcp_snd_ws = 0;
2164 2164 tcp->tcp_ts_recent = 0;
2165 2165 tcp->tcp_rnxt = 0; /* Displayed in mib */
2166 2166 DONTCARE(tcp->tcp_rwnd); /* Set in tcp_reinit() */
2167 2167 tcp->tcp_initial_pmtu = 0;
2168 2168
2169 2169 ASSERT(tcp->tcp_reass_head == NULL);
2170 2170 ASSERT(tcp->tcp_reass_tail == NULL);
2171 2171
2172 2172 tcp->tcp_cwnd_cnt = 0;
2173 2173
2174 2174 ASSERT(tcp->tcp_rcv_list == NULL);
2175 2175 ASSERT(tcp->tcp_rcv_last_head == NULL);
2176 2176 ASSERT(tcp->tcp_rcv_last_tail == NULL);
2177 2177 ASSERT(tcp->tcp_rcv_cnt == 0);
2178 2178
2179 2179 DONTCARE(tcp->tcp_cwnd_ssthresh); /* Init in tcp_set_destination */
2180 2180 DONTCARE(tcp->tcp_cwnd_max); /* Init in tcp_init_values */
2181 2181 tcp->tcp_csuna = 0;
2182 2182
2183 2183 tcp->tcp_rto = 0; /* Displayed in MIB */
2184 2184 DONTCARE(tcp->tcp_rtt_sa); /* Init in tcp_init_values */
2185 2185 DONTCARE(tcp->tcp_rtt_sd); /* Init in tcp_init_values */
2186 2186 tcp->tcp_rtt_update = 0;
2187 2187
2188 2188 DONTCARE(tcp->tcp_swl1); /* Init in case TCPS_LISTEN/TCPS_SYN_SENT */
2189 2189 DONTCARE(tcp->tcp_swl2); /* Init in case TCPS_LISTEN/TCPS_SYN_SENT */
2190 2190
2191 2191 tcp->tcp_rack = 0; /* Displayed in mib */
2192 2192 tcp->tcp_rack_cnt = 0;
2193 2193 tcp->tcp_rack_cur_max = 0;
2194 2194 tcp->tcp_rack_abs_max = 0;
2195 2195
2196 2196 tcp->tcp_max_swnd = 0;
2197 2197
2198 2198 ASSERT(tcp->tcp_listener == NULL);
2199 2199
2200 2200 DONTCARE(tcp->tcp_irs); /* tcp_valid_bits cleared */
2201 2201 DONTCARE(tcp->tcp_iss); /* tcp_valid_bits cleared */
2202 2202 DONTCARE(tcp->tcp_fss); /* tcp_valid_bits cleared */
2203 2203 DONTCARE(tcp->tcp_urg); /* tcp_valid_bits cleared */
2204 2204
2205 2205 ASSERT(tcp->tcp_conn_req_cnt_q == 0);
2206 2206 ASSERT(tcp->tcp_conn_req_cnt_q0 == 0);
2207 2207 PRESERVE(tcp->tcp_conn_req_max);
2208 2208 PRESERVE(tcp->tcp_conn_req_seqnum);
2209 2209
2210 2210 DONTCARE(tcp->tcp_first_timer_threshold); /* Init in tcp_init_values */
2211 2211 DONTCARE(tcp->tcp_second_timer_threshold); /* Init in tcp_init_values */
2212 2212 DONTCARE(tcp->tcp_first_ctimer_threshold); /* Init in tcp_init_values */
2213 2213 DONTCARE(tcp->tcp_second_ctimer_threshold); /* in tcp_init_values */
2214 2214
2215 2215 DONTCARE(tcp->tcp_urp_last); /* tcp_urp_last_valid is cleared */
2216 2216 ASSERT(tcp->tcp_urp_mp == NULL);
2217 2217 ASSERT(tcp->tcp_urp_mark_mp == NULL);
2218 2218 ASSERT(tcp->tcp_fused_sigurg_mp == NULL);
2219 2219
2220 2220 ASSERT(tcp->tcp_eager_next_q == NULL);
2221 2221 ASSERT(tcp->tcp_eager_last_q == NULL);
2222 2222 ASSERT((tcp->tcp_eager_next_q0 == NULL &&
2223 2223 tcp->tcp_eager_prev_q0 == NULL) ||
2224 2224 tcp->tcp_eager_next_q0 == tcp->tcp_eager_prev_q0);
2225 2225 ASSERT(tcp->tcp_conn.tcp_eager_conn_ind == NULL);
2226 2226
2227 2227 ASSERT((tcp->tcp_eager_next_drop_q0 == NULL &&
2228 2228 tcp->tcp_eager_prev_drop_q0 == NULL) ||
2229 2229 tcp->tcp_eager_next_drop_q0 == tcp->tcp_eager_prev_drop_q0);
2230 2230
2231 2231 DONTCARE(tcp->tcp_ka_rinterval); /* Init in tcp_init_values */
2232 2232 DONTCARE(tcp->tcp_ka_abort_thres); /* Init in tcp_init_values */
2233 2233 DONTCARE(tcp->tcp_ka_cnt); /* Init in tcp_init_values */
2234 2234
2235 2235 tcp->tcp_client_errno = 0;
2236 2236
2237 2237 DONTCARE(connp->conn_sum); /* Init in tcp_init_values */
2238 2238
2239 2239 connp->conn_faddr_v6 = ipv6_all_zeros; /* Displayed in MIB */
2240 2240
2241 2241 PRESERVE(connp->conn_bound_addr_v6);
2242 2242 tcp->tcp_last_sent_len = 0;
2243 2243 tcp->tcp_dupack_cnt = 0;
2244 2244
2245 2245 connp->conn_fport = 0; /* Displayed in MIB */
2246 2246 PRESERVE(connp->conn_lport);
2247 2247
2248 2248 PRESERVE(tcp->tcp_acceptor_lockp);
2249 2249
2250 2250 ASSERT(tcp->tcp_ordrel_mp == NULL);
2251 2251 PRESERVE(tcp->tcp_acceptor_id);
2252 2252 DONTCARE(tcp->tcp_ipsec_overhead);
2253 2253
2254 2254 PRESERVE(connp->conn_family);
2255 2255 /* Remove any remnants of mapped address binding */
2256 2256 if (connp->conn_family == AF_INET6) {
2257 2257 connp->conn_ipversion = IPV6_VERSION;
2258 2258 tcp->tcp_mss = tcps->tcps_mss_def_ipv6;
2259 2259 } else {
2260 2260 connp->conn_ipversion = IPV4_VERSION;
2261 2261 tcp->tcp_mss = tcps->tcps_mss_def_ipv4;
2262 2262 }
2263 2263
2264 2264 connp->conn_bound_if = 0;
2265 2265 connp->conn_recv_ancillary.crb_all = 0;
2266 2266 tcp->tcp_recvifindex = 0;
2267 2267 tcp->tcp_recvhops = 0;
2268 2268 tcp->tcp_closed = 0;
2269 2269 if (tcp->tcp_hopopts != NULL) {
2270 2270 mi_free(tcp->tcp_hopopts);
2271 2271 tcp->tcp_hopopts = NULL;
2272 2272 tcp->tcp_hopoptslen = 0;
2273 2273 }
2274 2274 ASSERT(tcp->tcp_hopoptslen == 0);
2275 2275 if (tcp->tcp_dstopts != NULL) {
2276 2276 mi_free(tcp->tcp_dstopts);
2277 2277 tcp->tcp_dstopts = NULL;
2278 2278 tcp->tcp_dstoptslen = 0;
2279 2279 }
2280 2280 ASSERT(tcp->tcp_dstoptslen == 0);
2281 2281 if (tcp->tcp_rthdrdstopts != NULL) {
2282 2282 mi_free(tcp->tcp_rthdrdstopts);
2283 2283 tcp->tcp_rthdrdstopts = NULL;
2284 2284 tcp->tcp_rthdrdstoptslen = 0;
2285 2285 }
2286 2286 ASSERT(tcp->tcp_rthdrdstoptslen == 0);
2287 2287 if (tcp->tcp_rthdr != NULL) {
2288 2288 mi_free(tcp->tcp_rthdr);
2289 2289 tcp->tcp_rthdr = NULL;
2290 2290 tcp->tcp_rthdrlen = 0;
2291 2291 }
2292 2292 ASSERT(tcp->tcp_rthdrlen == 0);
2293 2293
2294 2294 /* Reset fusion-related fields */
2295 2295 tcp->tcp_fused = B_FALSE;
2296 2296 tcp->tcp_unfusable = B_FALSE;
2297 2297 tcp->tcp_fused_sigurg = B_FALSE;
2298 2298 tcp->tcp_loopback_peer = NULL;
2299 2299
2300 2300 tcp->tcp_lso = B_FALSE;
2301 2301
2302 2302 tcp->tcp_in_ack_unsent = 0;
2303 2303 tcp->tcp_cork = B_FALSE;
2304 2304 tcp->tcp_tconnind_started = B_FALSE;
2305 2305
2306 2306 PRESERVE(tcp->tcp_squeue_bytes);
2307 2307
2308 2308 tcp->tcp_closemp_used = B_FALSE;
2309 2309
2310 2310 PRESERVE(tcp->tcp_rsrv_mp);
2311 2311 PRESERVE(tcp->tcp_rsrv_mp_lock);
2312 2312
2313 2313 #ifdef DEBUG
2314 2314 DONTCARE(tcp->tcmp_stk[0]);
2315 2315 #endif
2316 2316
2317 2317 PRESERVE(tcp->tcp_connid);
2318 2318
2319 2319 ASSERT(tcp->tcp_listen_cnt == NULL);
2320 2320 ASSERT(tcp->tcp_reass_tid == 0);
2321 2321
2322 2322 #undef DONTCARE
2323 2323 #undef PRESERVE
2324 2324 }
2325 2325
2326 2326 /*
2327 2327 * Initialize the various fields in tcp_t. If parent (the listener) is non
2328 2328 * NULL, certain values will be inheritted from it.
2329 2329 */
2330 2330 void
2331 2331 tcp_init_values(tcp_t *tcp, tcp_t *parent)
2332 2332 {
2333 2333 tcp_stack_t *tcps = tcp->tcp_tcps;
2334 2334 conn_t *connp = tcp->tcp_connp;
2335 2335 clock_t rto;
2336 2336
2337 2337 ASSERT((connp->conn_family == AF_INET &&
2338 2338 connp->conn_ipversion == IPV4_VERSION) ||
2339 2339 (connp->conn_family == AF_INET6 &&
2340 2340 (connp->conn_ipversion == IPV4_VERSION ||
2341 2341 connp->conn_ipversion == IPV6_VERSION)));
2342 2342
2343 2343 if (parent == NULL) {
2344 2344 tcp->tcp_naglim = tcps->tcps_naglim_def;
2345 2345
2346 2346 tcp->tcp_rto_initial = tcps->tcps_rexmit_interval_initial;
2347 2347 tcp->tcp_rto_min = tcps->tcps_rexmit_interval_min;
2348 2348 tcp->tcp_rto_max = tcps->tcps_rexmit_interval_max;
2349 2349
2350 2350 tcp->tcp_first_ctimer_threshold =
2351 2351 tcps->tcps_ip_notify_cinterval;
2352 2352 tcp->tcp_second_ctimer_threshold =
2353 2353 tcps->tcps_ip_abort_cinterval;
2354 2354 tcp->tcp_first_timer_threshold = tcps->tcps_ip_notify_interval;
2355 2355 tcp->tcp_second_timer_threshold = tcps->tcps_ip_abort_interval;
2356 2356
2357 2357 tcp->tcp_fin_wait_2_flush_interval =
2358 2358 tcps->tcps_fin_wait_2_flush_interval;
2359 2359
2360 2360 tcp->tcp_ka_interval = tcps->tcps_keepalive_interval;
2361 2361 tcp->tcp_ka_abort_thres = tcps->tcps_keepalive_abort_interval;
2362 2362 tcp->tcp_ka_cnt = 0;
2363 2363 tcp->tcp_ka_rinterval = 0;
2364 2364
2365 2365 /*
2366 2366 * Default value of tcp_init_cwnd is 0, so no need to set here
2367 2367 * if parent is NULL. But we need to inherit it from parent.
2368 2368 */
2369 2369 } else {
2370 2370 /* Inherit various TCP parameters from the parent. */
2371 2371 tcp->tcp_naglim = parent->tcp_naglim;
2372 2372
2373 2373 tcp->tcp_rto_initial = parent->tcp_rto_initial;
2374 2374 tcp->tcp_rto_min = parent->tcp_rto_min;
2375 2375 tcp->tcp_rto_max = parent->tcp_rto_max;
2376 2376
2377 2377 tcp->tcp_first_ctimer_threshold =
2378 2378 parent->tcp_first_ctimer_threshold;
2379 2379 tcp->tcp_second_ctimer_threshold =
2380 2380 parent->tcp_second_ctimer_threshold;
2381 2381 tcp->tcp_first_timer_threshold =
2382 2382 parent->tcp_first_timer_threshold;
2383 2383 tcp->tcp_second_timer_threshold =
2384 2384 parent->tcp_second_timer_threshold;
2385 2385
2386 2386 tcp->tcp_fin_wait_2_flush_interval =
2387 2387 parent->tcp_fin_wait_2_flush_interval;
2388 2388
2389 2389 tcp->tcp_ka_interval = parent->tcp_ka_interval;
2390 2390 tcp->tcp_ka_abort_thres = parent->tcp_ka_abort_thres;
2391 2391 tcp->tcp_ka_cnt = parent->tcp_ka_cnt;
2392 2392 tcp->tcp_ka_rinterval = parent->tcp_ka_rinterval;
2393 2393
2394 2394 tcp->tcp_init_cwnd = parent->tcp_init_cwnd;
2395 2395 }
2396 2396
2397 2397 /*
2398 2398 * Initialize tcp_rtt_sa and tcp_rtt_sd so that the calculated RTO
2399 2399 * will be close to tcp_rexmit_interval_initial. By doing this, we
2400 2400 * allow the algorithm to adjust slowly to large fluctuations of RTT
2401 2401 * during first few transmissions of a connection as seen in slow
2402 2402 * links.
2403 2403 */
2404 2404 tcp->tcp_rtt_sa = tcp->tcp_rto_initial << 2;
2405 2405 tcp->tcp_rtt_sd = tcp->tcp_rto_initial >> 1;
2406 2406 rto = (tcp->tcp_rtt_sa >> 3) + tcp->tcp_rtt_sd +
2407 2407 tcps->tcps_rexmit_interval_extra + (tcp->tcp_rtt_sa >> 5) +
2408 2408 tcps->tcps_conn_grace_period;
2409 2409 TCP_SET_RTO(tcp, rto);
2410 2410
2411 2411 tcp->tcp_timer_backoff = 0;
2412 2412 tcp->tcp_ms_we_have_waited = 0;
2413 2413 tcp->tcp_last_recv_time = ddi_get_lbolt();
2414 2414 tcp->tcp_cwnd_max = tcps->tcps_cwnd_max_;
2415 2415 tcp->tcp_cwnd_ssthresh = TCP_MAX_LARGEWIN;
2416 2416 tcp->tcp_snd_burst = TCP_CWND_INFINITE;
2417 2417
2418 2418 tcp->tcp_maxpsz_multiplier = tcps->tcps_maxpsz_multiplier;
2419 2419
2420 2420 /* NOTE: ISS is now set in tcp_set_destination(). */
2421 2421
2422 2422 /* Reset fusion-related fields */
2423 2423 tcp->tcp_fused = B_FALSE;
2424 2424 tcp->tcp_unfusable = B_FALSE;
2425 2425 tcp->tcp_fused_sigurg = B_FALSE;
2426 2426 tcp->tcp_loopback_peer = NULL;
2427 2427
2428 2428 /* We rebuild the header template on the next connect/conn_request */
2429 2429
2430 2430 connp->conn_mlp_type = mlptSingle;
2431 2431
2432 2432 /*
2433 2433 * Init the window scale to the max so tcp_rwnd_set() won't pare
2434 2434 * down tcp_rwnd. tcp_set_destination() will set the right value later.
2435 2435 */
2436 2436 tcp->tcp_rcv_ws = TCP_MAX_WINSHIFT;
2437 2437 tcp->tcp_rwnd = connp->conn_rcvbuf;
2438 2438
2439 2439 tcp->tcp_cork = B_FALSE;
2440 2440 /*
2441 2441 * Init the tcp_debug option if it wasn't already set. This value
2442 2442 * determines whether TCP
2443 2443 * calls strlog() to print out debug messages. Doing this
2444 2444 * initialization here means that this value is not inherited thru
2445 2445 * tcp_reinit().
2446 2446 */
2447 2447 if (!connp->conn_debug)
2448 2448 connp->conn_debug = tcps->tcps_dbg;
2449 2449 }
2450 2450
2451 2451 /*
2452 2452 * Update the TCP connection according to change of PMTU.
2453 2453 *
2454 2454 * Path MTU might have changed by either increase or decrease, so need to
2455 2455 * adjust the MSS based on the value of ixa_pmtu. No need to handle tiny
2456 2456 * or negative MSS, since tcp_mss_set() will do it.
2457 2457 */
2458 2458 void
2459 2459 tcp_update_pmtu(tcp_t *tcp, boolean_t decrease_only)
2460 2460 {
2461 2461 uint32_t pmtu;
2462 2462 int32_t mss;
2463 2463 conn_t *connp = tcp->tcp_connp;
2464 2464 ip_xmit_attr_t *ixa = connp->conn_ixa;
2465 2465 iaflags_t ixaflags;
2466 2466
2467 2467 if (tcp->tcp_tcps->tcps_ignore_path_mtu)
2468 2468 return;
2469 2469
2470 2470 if (tcp->tcp_state < TCPS_ESTABLISHED)
2471 2471 return;
2472 2472
2473 2473 /*
2474 2474 * Always call ip_get_pmtu() to make sure that IP has updated
2475 2475 * ixa_flags properly.
2476 2476 */
2477 2477 pmtu = ip_get_pmtu(ixa);
2478 2478 ixaflags = ixa->ixa_flags;
2479 2479
2480 2480 /*
2481 2481 * Calculate the MSS by decreasing the PMTU by conn_ht_iphc_len and
2482 2482 * IPsec overhead if applied. Make sure to use the most recent
2483 2483 * IPsec information.
2484 2484 */
2485 2485 mss = pmtu - connp->conn_ht_iphc_len - conn_ipsec_length(connp);
2486 2486
2487 2487 /*
2488 2488 * Nothing to change, so just return.
2489 2489 */
2490 2490 if (mss == tcp->tcp_mss)
2491 2491 return;
2492 2492
2493 2493 /*
2494 2494 * Currently, for ICMP errors, only PMTU decrease is handled.
2495 2495 */
2496 2496 if (mss > tcp->tcp_mss && decrease_only)
2497 2497 return;
2498 2498
2499 2499 DTRACE_PROBE2(tcp_update_pmtu, int32_t, tcp->tcp_mss, uint32_t, mss);
2500 2500
2501 2501 /*
2502 2502 * Update ixa_fragsize and ixa_pmtu.
2503 2503 */
2504 2504 ixa->ixa_fragsize = ixa->ixa_pmtu = pmtu;
2505 2505
2506 2506 /*
2507 2507 * Adjust MSS and all relevant variables.
2508 2508 */
2509 2509 tcp_mss_set(tcp, mss);
2510 2510
2511 2511 /*
2512 2512 * If the PMTU is below the min size maintained by IP, then ip_get_pmtu
2513 2513 * has set IXAF_PMTU_TOO_SMALL and cleared IXAF_PMTU_IPV4_DF. Since TCP
2514 2514 * has a (potentially different) min size we do the same. Make sure to
2515 2515 * clear IXAF_DONTFRAG, which is used by IP to decide whether to
2516 2516 * fragment the packet.
2517 2517 *
2518 2518 * LSO over IPv6 can not be fragmented. So need to disable LSO
2519 2519 * when IPv6 fragmentation is needed.
2520 2520 */
2521 2521 if (mss < tcp->tcp_tcps->tcps_mss_min)
2522 2522 ixaflags |= IXAF_PMTU_TOO_SMALL;
2523 2523
2524 2524 if (ixaflags & IXAF_PMTU_TOO_SMALL)
2525 2525 ixaflags &= ~(IXAF_DONTFRAG | IXAF_PMTU_IPV4_DF);
2526 2526
2527 2527 if ((connp->conn_ipversion == IPV4_VERSION) &&
2528 2528 !(ixaflags & IXAF_PMTU_IPV4_DF)) {
2529 2529 tcp->tcp_ipha->ipha_fragment_offset_and_flags = 0;
2530 2530 }
2531 2531 ixa->ixa_flags = ixaflags;
2532 2532 }
2533 2533
2534 2534 int
2535 2535 tcp_maxpsz_set(tcp_t *tcp, boolean_t set_maxblk)
2536 2536 {
2537 2537 conn_t *connp = tcp->tcp_connp;
2538 2538 queue_t *q = connp->conn_rq;
2539 2539 int32_t mss = tcp->tcp_mss;
2540 2540 int maxpsz;
2541 2541
2542 2542 if (TCP_IS_DETACHED(tcp))
2543 2543 return (mss);
2544 2544 if (tcp->tcp_fused) {
2545 2545 maxpsz = tcp_fuse_maxpsz(tcp);
2546 2546 mss = INFPSZ;
2547 2547 } else if (tcp->tcp_maxpsz_multiplier == 0) {
2548 2548 /*
2549 2549 * Set the sd_qn_maxpsz according to the socket send buffer
2550 2550 * size, and sd_maxblk to INFPSZ (-1). This will essentially
2551 2551 * instruct the stream head to copyin user data into contiguous
2552 2552 * kernel-allocated buffers without breaking it up into smaller
2553 2553 * chunks. We round up the buffer size to the nearest SMSS.
2554 2554 */
2555 2555 maxpsz = MSS_ROUNDUP(connp->conn_sndbuf, mss);
2556 2556 mss = INFPSZ;
2557 2557 } else {
2558 2558 /*
2559 2559 * Set sd_qn_maxpsz to approx half the (receivers) buffer
2560 2560 * (and a multiple of the mss). This instructs the stream
2561 2561 * head to break down larger than SMSS writes into SMSS-
2562 2562 * size mblks, up to tcp_maxpsz_multiplier mblks at a time.
2563 2563 */
2564 2564 maxpsz = tcp->tcp_maxpsz_multiplier * mss;
2565 2565 if (maxpsz > connp->conn_sndbuf / 2) {
2566 2566 maxpsz = connp->conn_sndbuf / 2;
2567 2567 /* Round up to nearest mss */
2568 2568 maxpsz = MSS_ROUNDUP(maxpsz, mss);
2569 2569 }
2570 2570 }
2571 2571
2572 2572 (void) proto_set_maxpsz(q, connp, maxpsz);
2573 2573 if (!(IPCL_IS_NONSTR(connp)))
2574 2574 connp->conn_wq->q_maxpsz = maxpsz;
2575 2575 if (set_maxblk)
2576 2576 (void) proto_set_tx_maxblk(q, connp, mss);
2577 2577 return (mss);
2578 2578 }
2579 2579
2580 2580 /* For /dev/tcp aka AF_INET open */
2581 2581 static int
2582 2582 tcp_openv4(queue_t *q, dev_t *devp, int flag, int sflag, cred_t *credp)
2583 2583 {
2584 2584 return (tcp_open(q, devp, flag, sflag, credp, B_FALSE));
2585 2585 }
2586 2586
2587 2587 /* For /dev/tcp6 aka AF_INET6 open */
2588 2588 static int
2589 2589 tcp_openv6(queue_t *q, dev_t *devp, int flag, int sflag, cred_t *credp)
2590 2590 {
2591 2591 return (tcp_open(q, devp, flag, sflag, credp, B_TRUE));
2592 2592 }
2593 2593
2594 2594 conn_t *
2595 2595 tcp_create_common(cred_t *credp, boolean_t isv6, boolean_t issocket,
2596 2596 int *errorp)
2597 2597 {
2598 2598 tcp_t *tcp = NULL;
2599 2599 conn_t *connp;
2600 2600 zoneid_t zoneid;
2601 2601 tcp_stack_t *tcps;
2602 2602 squeue_t *sqp;
2603 2603
2604 2604 ASSERT(errorp != NULL);
2605 2605 /*
2606 2606 * Find the proper zoneid and netstack.
2607 2607 */
2608 2608 /*
2609 2609 * Special case for install: miniroot needs to be able to
2610 2610 * access files via NFS as though it were always in the
2611 2611 * global zone.
2612 2612 */
2613 2613 if (credp == kcred && nfs_global_client_only != 0) {
2614 2614 zoneid = GLOBAL_ZONEID;
2615 2615 tcps = netstack_find_by_stackid(GLOBAL_NETSTACKID)->
2616 2616 netstack_tcp;
2617 2617 ASSERT(tcps != NULL);
2618 2618 } else {
2619 2619 netstack_t *ns;
2620 2620 int err;
2621 2621
2622 2622 if ((err = secpolicy_basic_net_access(credp)) != 0) {
2623 2623 *errorp = err;
2624 2624 return (NULL);
2625 2625 }
2626 2626
2627 2627 ns = netstack_find_by_cred(credp);
2628 2628 ASSERT(ns != NULL);
2629 2629 tcps = ns->netstack_tcp;
2630 2630 ASSERT(tcps != NULL);
2631 2631
2632 2632 /*
2633 2633 * For exclusive stacks we set the zoneid to zero
2634 2634 * to make TCP operate as if in the global zone.
2635 2635 */
2636 2636 if (tcps->tcps_netstack->netstack_stackid !=
2637 2637 GLOBAL_NETSTACKID)
2638 2638 zoneid = GLOBAL_ZONEID;
2639 2639 else
2640 2640 zoneid = crgetzoneid(credp);
2641 2641 }
2642 2642
2643 2643 sqp = IP_SQUEUE_GET((uint_t)gethrtime());
2644 2644 connp = (conn_t *)tcp_get_conn(sqp, tcps);
2645 2645 /*
2646 2646 * Both tcp_get_conn and netstack_find_by_cred incremented refcnt,
2647 2647 * so we drop it by one.
2648 2648 */
2649 2649 netstack_rele(tcps->tcps_netstack);
2650 2650 if (connp == NULL) {
2651 2651 *errorp = ENOSR;
2652 2652 return (NULL);
2653 2653 }
2654 2654 ASSERT(connp->conn_ixa->ixa_protocol == connp->conn_proto);
2655 2655
2656 2656 connp->conn_sqp = sqp;
2657 2657 connp->conn_initial_sqp = connp->conn_sqp;
2658 2658 connp->conn_ixa->ixa_sqp = connp->conn_sqp;
2659 2659 tcp = connp->conn_tcp;
2660 2660
2661 2661 /*
2662 2662 * Besides asking IP to set the checksum for us, have conn_ip_output
2663 2663 * to do the following checks when necessary:
2664 2664 *
2665 2665 * IXAF_VERIFY_SOURCE: drop packets when our outer source goes invalid
2666 2666 * IXAF_VERIFY_PMTU: verify PMTU changes
2667 2667 * IXAF_VERIFY_LSO: verify LSO capability changes
2668 2668 */
2669 2669 connp->conn_ixa->ixa_flags |= IXAF_SET_ULP_CKSUM | IXAF_VERIFY_SOURCE |
2670 2670 IXAF_VERIFY_PMTU | IXAF_VERIFY_LSO;
2671 2671
2672 2672 if (!tcps->tcps_dev_flow_ctl)
2673 2673 connp->conn_ixa->ixa_flags |= IXAF_NO_DEV_FLOW_CTL;
2674 2674
2675 2675 if (isv6) {
2676 2676 connp->conn_ixa->ixa_src_preferences = IPV6_PREFER_SRC_DEFAULT;
2677 2677 connp->conn_ipversion = IPV6_VERSION;
2678 2678 connp->conn_family = AF_INET6;
2679 2679 tcp->tcp_mss = tcps->tcps_mss_def_ipv6;
2680 2680 connp->conn_default_ttl = tcps->tcps_ipv6_hoplimit;
2681 2681 } else {
2682 2682 connp->conn_ipversion = IPV4_VERSION;
2683 2683 connp->conn_family = AF_INET;
2684 2684 tcp->tcp_mss = tcps->tcps_mss_def_ipv4;
2685 2685 connp->conn_default_ttl = tcps->tcps_ipv4_ttl;
2686 2686 }
2687 2687 connp->conn_xmit_ipp.ipp_unicast_hops = connp->conn_default_ttl;
2688 2688
2689 2689 crhold(credp);
2690 2690 connp->conn_cred = credp;
2691 2691 connp->conn_cpid = curproc->p_pid;
2692 2692 connp->conn_open_time = ddi_get_lbolt64();
2693 2693
2694 2694 /* Cache things in the ixa without any refhold */
2695 2695 ASSERT(!(connp->conn_ixa->ixa_free_flags & IXA_FREE_CRED));
2696 2696 connp->conn_ixa->ixa_cred = credp;
2697 2697 connp->conn_ixa->ixa_cpid = connp->conn_cpid;
2698 2698
2699 2699 connp->conn_zoneid = zoneid;
2700 2700 /* conn_allzones can not be set this early, hence no IPCL_ZONEID */
2701 2701 connp->conn_ixa->ixa_zoneid = zoneid;
2702 2702 connp->conn_mlp_type = mlptSingle;
2703 2703 ASSERT(connp->conn_netstack == tcps->tcps_netstack);
2704 2704 ASSERT(tcp->tcp_tcps == tcps);
2705 2705
2706 2706 /*
2707 2707 * If the caller has the process-wide flag set, then default to MAC
2708 2708 * exempt mode. This allows read-down to unlabeled hosts.
2709 2709 */
2710 2710 if (getpflags(NET_MAC_AWARE, credp) != 0)
2711 2711 connp->conn_mac_mode = CONN_MAC_AWARE;
2712 2712
2713 2713 connp->conn_zone_is_global = (crgetzoneid(credp) == GLOBAL_ZONEID);
2714 2714
2715 2715 if (issocket) {
2716 2716 tcp->tcp_issocket = 1;
2717 2717 }
2718 2718
2719 2719 connp->conn_rcvbuf = tcps->tcps_recv_hiwat;
2720 2720 connp->conn_sndbuf = tcps->tcps_xmit_hiwat;
2721 2721 connp->conn_sndlowat = tcps->tcps_xmit_lowat;
2722 2722 connp->conn_so_type = SOCK_STREAM;
2723 2723 connp->conn_wroff = connp->conn_ht_iphc_allocated +
2724 2724 tcps->tcps_wroff_xtra;
2725 2725
2726 2726 SOCK_CONNID_INIT(tcp->tcp_connid);
2727 2727 /* DTrace ignores this - it isn't a tcp:::state-change */
2728 2728 tcp->tcp_state = TCPS_IDLE;
2729 2729 tcp_init_values(tcp, NULL);
2730 2730 return (connp);
2731 2731 }
2732 2732
2733 2733 static int
2734 2734 tcp_open(queue_t *q, dev_t *devp, int flag, int sflag, cred_t *credp,
2735 2735 boolean_t isv6)
2736 2736 {
2737 2737 tcp_t *tcp = NULL;
2738 2738 conn_t *connp = NULL;
2739 2739 int err;
2740 2740 vmem_t *minor_arena = NULL;
2741 2741 dev_t conn_dev;
2742 2742 boolean_t issocket;
2743 2743
2744 2744 if (q->q_ptr != NULL)
2745 2745 return (0);
2746 2746
2747 2747 if (sflag == MODOPEN)
2748 2748 return (EINVAL);
2749 2749
2750 2750 if ((ip_minor_arena_la != NULL) && (flag & SO_SOCKSTR) &&
2751 2751 ((conn_dev = inet_minor_alloc(ip_minor_arena_la)) != 0)) {
2752 2752 minor_arena = ip_minor_arena_la;
2753 2753 } else {
2754 2754 /*
2755 2755 * Either minor numbers in the large arena were exhausted
2756 2756 * or a non socket application is doing the open.
2757 2757 * Try to allocate from the small arena.
2758 2758 */
2759 2759 if ((conn_dev = inet_minor_alloc(ip_minor_arena_sa)) == 0) {
2760 2760 return (EBUSY);
2761 2761 }
2762 2762 minor_arena = ip_minor_arena_sa;
2763 2763 }
2764 2764
2765 2765 ASSERT(minor_arena != NULL);
2766 2766
2767 2767 *devp = makedevice(getmajor(*devp), (minor_t)conn_dev);
2768 2768
2769 2769 if (flag & SO_FALLBACK) {
2770 2770 /*
2771 2771 * Non streams socket needs a stream to fallback to
2772 2772 */
2773 2773 RD(q)->q_ptr = (void *)conn_dev;
2774 2774 WR(q)->q_qinfo = &tcp_fallback_sock_winit;
2775 2775 WR(q)->q_ptr = (void *)minor_arena;
2776 2776 qprocson(q);
2777 2777 return (0);
2778 2778 } else if (flag & SO_ACCEPTOR) {
2779 2779 q->q_qinfo = &tcp_acceptor_rinit;
2780 2780 /*
2781 2781 * the conn_dev and minor_arena will be subsequently used by
2782 2782 * tcp_tli_accept() and tcp_tpi_close_accept() to figure out
2783 2783 * the minor device number for this connection from the q_ptr.
2784 2784 */
2785 2785 RD(q)->q_ptr = (void *)conn_dev;
2786 2786 WR(q)->q_qinfo = &tcp_acceptor_winit;
2787 2787 WR(q)->q_ptr = (void *)minor_arena;
2788 2788 qprocson(q);
2789 2789 return (0);
2790 2790 }
2791 2791
2792 2792 issocket = flag & SO_SOCKSTR;
2793 2793 connp = tcp_create_common(credp, isv6, issocket, &err);
2794 2794
2795 2795 if (connp == NULL) {
2796 2796 inet_minor_free(minor_arena, conn_dev);
2797 2797 q->q_ptr = WR(q)->q_ptr = NULL;
2798 2798 return (err);
2799 2799 }
2800 2800
2801 2801 connp->conn_rq = q;
2802 2802 connp->conn_wq = WR(q);
2803 2803 q->q_ptr = WR(q)->q_ptr = connp;
2804 2804
2805 2805 connp->conn_dev = conn_dev;
2806 2806 connp->conn_minor_arena = minor_arena;
2807 2807
2808 2808 ASSERT(q->q_qinfo == &tcp_rinitv4 || q->q_qinfo == &tcp_rinitv6);
2809 2809 ASSERT(WR(q)->q_qinfo == &tcp_winit);
2810 2810
2811 2811 tcp = connp->conn_tcp;
2812 2812
2813 2813 if (issocket) {
2814 2814 WR(q)->q_qinfo = &tcp_sock_winit;
2815 2815 } else {
2816 2816 #ifdef _ILP32
2817 2817 tcp->tcp_acceptor_id = (t_uscalar_t)RD(q);
2818 2818 #else
2819 2819 tcp->tcp_acceptor_id = conn_dev;
2820 2820 #endif /* _ILP32 */
2821 2821 tcp_acceptor_hash_insert(tcp->tcp_acceptor_id, tcp);
2822 2822 }
2823 2823
2824 2824 /*
2825 2825 * Put the ref for TCP. Ref for IP was already put
2826 2826 * by ipcl_conn_create. Also Make the conn_t globally
2827 2827 * visible to walkers
2828 2828 */
2829 2829 mutex_enter(&connp->conn_lock);
2830 2830 CONN_INC_REF_LOCKED(connp);
2831 2831 ASSERT(connp->conn_ref == 2);
2832 2832 connp->conn_state_flags &= ~CONN_INCIPIENT;
2833 2833 mutex_exit(&connp->conn_lock);
2834 2834
2835 2835 qprocson(q);
2836 2836 return (0);
2837 2837 }
2838 2838
2839 2839 /*
2840 2840 * Build/update the tcp header template (in conn_ht_iphc) based on
2841 2841 * conn_xmit_ipp. The headers include ip6_t, any extension
2842 2842 * headers, and the maximum size tcp header (to avoid reallocation
2843 2843 * on the fly for additional tcp options).
2844 2844 *
2845 2845 * Assumes the caller has already set conn_{faddr,laddr,fport,lport,flowinfo}.
2846 2846 * Returns failure if can't allocate memory.
2847 2847 */
2848 2848 int
2849 2849 tcp_build_hdrs(tcp_t *tcp)
2850 2850 {
2851 2851 tcp_stack_t *tcps = tcp->tcp_tcps;
2852 2852 conn_t *connp = tcp->tcp_connp;
2853 2853 char buf[TCP_MAX_HDR_LENGTH];
2854 2854 uint_t buflen;
2855 2855 uint_t ulplen = TCP_MIN_HEADER_LENGTH;
2856 2856 uint_t extralen = TCP_MAX_TCP_OPTIONS_LENGTH;
2857 2857 tcpha_t *tcpha;
2858 2858 uint32_t cksum;
2859 2859 int error;
2860 2860
2861 2861 /*
2862 2862 * We might be called after the connection is set up, and we might
2863 2863 * have TS options already in the TCP header. Thus we save any
2864 2864 * existing tcp header.
2865 2865 */
2866 2866 buflen = connp->conn_ht_ulp_len;
2867 2867 if (buflen != 0) {
2868 2868 bcopy(connp->conn_ht_ulp, buf, buflen);
2869 2869 extralen -= buflen - ulplen;
2870 2870 ulplen = buflen;
2871 2871 }
2872 2872
2873 2873 /* Grab lock to satisfy ASSERT; TCP is serialized using squeue */
2874 2874 mutex_enter(&connp->conn_lock);
2875 2875 error = conn_build_hdr_template(connp, ulplen, extralen,
2876 2876 &connp->conn_laddr_v6, &connp->conn_faddr_v6, connp->conn_flowinfo);
2877 2877 mutex_exit(&connp->conn_lock);
2878 2878 if (error != 0)
2879 2879 return (error);
2880 2880
2881 2881 /*
2882 2882 * Any routing header/option has been massaged. The checksum difference
2883 2883 * is stored in conn_sum for later use.
2884 2884 */
2885 2885 tcpha = (tcpha_t *)connp->conn_ht_ulp;
2886 2886 tcp->tcp_tcpha = tcpha;
2887 2887
2888 2888 /* restore any old tcp header */
2889 2889 if (buflen != 0) {
2890 2890 bcopy(buf, connp->conn_ht_ulp, buflen);
2891 2891 } else {
2892 2892 tcpha->tha_sum = 0;
2893 2893 tcpha->tha_urp = 0;
2894 2894 tcpha->tha_ack = 0;
2895 2895 tcpha->tha_offset_and_reserved = (5 << 4);
2896 2896 tcpha->tha_lport = connp->conn_lport;
2897 2897 tcpha->tha_fport = connp->conn_fport;
2898 2898 }
2899 2899
2900 2900 /*
2901 2901 * IP wants our header length in the checksum field to
2902 2902 * allow it to perform a single pseudo-header+checksum
2903 2903 * calculation on behalf of TCP.
2904 2904 * Include the adjustment for a source route once IP_OPTIONS is set.
2905 2905 */
2906 2906 cksum = sizeof (tcpha_t) + connp->conn_sum;
2907 2907 cksum = (cksum >> 16) + (cksum & 0xFFFF);
2908 2908 ASSERT(cksum < 0x10000);
2909 2909 tcpha->tha_sum = htons(cksum);
2910 2910
2911 2911 if (connp->conn_ipversion == IPV4_VERSION)
2912 2912 tcp->tcp_ipha = (ipha_t *)connp->conn_ht_iphc;
2913 2913 else
2914 2914 tcp->tcp_ip6h = (ip6_t *)connp->conn_ht_iphc;
2915 2915
2916 2916 if (connp->conn_ht_iphc_allocated + tcps->tcps_wroff_xtra >
2917 2917 connp->conn_wroff) {
2918 2918 connp->conn_wroff = connp->conn_ht_iphc_allocated +
2919 2919 tcps->tcps_wroff_xtra;
2920 2920 (void) proto_set_tx_wroff(connp->conn_rq, connp,
2921 2921 connp->conn_wroff);
2922 2922 }
2923 2923 return (0);
2924 2924 }
2925 2925
2926 2926 /*
2927 2927 * tcp_rwnd_set() is called to adjust the receive window to a desired value.
2928 2928 * We do not allow the receive window to shrink. After setting rwnd,
2929 2929 * set the flow control hiwat of the stream.
2930 2930 *
2931 2931 * This function is called in 2 cases:
2932 2932 *
2933 2933 * 1) Before data transfer begins, in tcp_input_listener() for accepting a
2934 2934 * connection (passive open) and in tcp_input_data() for active connect.
2935 2935 * This is called after tcp_mss_set() when the desired MSS value is known.
2936 2936 * This makes sure that our window size is a mutiple of the other side's
2937 2937 * MSS.
2938 2938 * 2) Handling SO_RCVBUF option.
2939 2939 *
2940 2940 * It is ASSUMED that the requested size is a multiple of the current MSS.
2941 2941 *
2942 2942 * XXX - Should allow a lower rwnd than tcp_recv_hiwat_minmss * mss if the
2943 2943 * user requests so.
2944 2944 */
2945 2945 int
2946 2946 tcp_rwnd_set(tcp_t *tcp, uint32_t rwnd)
2947 2947 {
2948 2948 uint32_t mss = tcp->tcp_mss;
2949 2949 uint32_t old_max_rwnd;
2950 2950 uint32_t max_transmittable_rwnd;
2951 2951 boolean_t tcp_detached = TCP_IS_DETACHED(tcp);
2952 2952 tcp_stack_t *tcps = tcp->tcp_tcps;
2953 2953 conn_t *connp = tcp->tcp_connp;
2954 2954
2955 2955 /*
2956 2956 * Insist on a receive window that is at least
2957 2957 * tcp_recv_hiwat_minmss * MSS (default 4 * MSS) to avoid
2958 2958 * funny TCP interactions of Nagle algorithm, SWS avoidance
2959 2959 * and delayed acknowledgement.
2960 2960 */
2961 2961 rwnd = MAX(rwnd, tcps->tcps_recv_hiwat_minmss * mss);
2962 2962
2963 2963 if (tcp->tcp_fused) {
2964 2964 size_t sth_hiwat;
2965 2965 tcp_t *peer_tcp = tcp->tcp_loopback_peer;
2966 2966
2967 2967 ASSERT(peer_tcp != NULL);
2968 2968 sth_hiwat = tcp_fuse_set_rcv_hiwat(tcp, rwnd);
2969 2969 if (!tcp_detached) {
2970 2970 (void) proto_set_rx_hiwat(connp->conn_rq, connp,
2971 2971 sth_hiwat);
2972 2972 tcp_set_recv_threshold(tcp, sth_hiwat >> 3);
2973 2973 }
2974 2974
2975 2975 /* Caller could have changed tcp_rwnd; update tha_win */
2976 2976 if (tcp->tcp_tcpha != NULL) {
2977 2977 tcp->tcp_tcpha->tha_win =
2978 2978 htons(tcp->tcp_rwnd >> tcp->tcp_rcv_ws);
2979 2979 }
2980 2980 if ((tcp->tcp_rcv_ws > 0) && rwnd > tcp->tcp_cwnd_max)
2981 2981 tcp->tcp_cwnd_max = rwnd;
2982 2982
2983 2983 /*
2984 2984 * In the fusion case, the maxpsz stream head value of
2985 2985 * our peer is set according to its send buffer size
2986 2986 * and our receive buffer size; since the latter may
2987 2987 * have changed we need to update the peer's maxpsz.
2988 2988 */
2989 2989 (void) tcp_maxpsz_set(peer_tcp, B_TRUE);
2990 2990 return (sth_hiwat);
2991 2991 }
2992 2992
2993 2993 if (tcp_detached)
2994 2994 old_max_rwnd = tcp->tcp_rwnd;
2995 2995 else
2996 2996 old_max_rwnd = connp->conn_rcvbuf;
2997 2997
2998 2998
2999 2999 /*
3000 3000 * If window size info has already been exchanged, TCP should not
3001 3001 * shrink the window. Shrinking window is doable if done carefully.
3002 3002 * We may add that support later. But so far there is not a real
3003 3003 * need to do that.
3004 3004 */
3005 3005 if (rwnd < old_max_rwnd && tcp->tcp_state > TCPS_SYN_SENT) {
3006 3006 /* MSS may have changed, do a round up again. */
3007 3007 rwnd = MSS_ROUNDUP(old_max_rwnd, mss);
3008 3008 }
3009 3009
3010 3010 /*
3011 3011 * tcp_rcv_ws starts with TCP_MAX_WINSHIFT so the following check
3012 3012 * can be applied even before the window scale option is decided.
3013 3013 */
3014 3014 max_transmittable_rwnd = TCP_MAXWIN << tcp->tcp_rcv_ws;
3015 3015 if (rwnd > max_transmittable_rwnd) {
3016 3016 rwnd = max_transmittable_rwnd -
3017 3017 (max_transmittable_rwnd % mss);
3018 3018 if (rwnd < mss)
3019 3019 rwnd = max_transmittable_rwnd;
3020 3020 /*
3021 3021 * If we're over the limit we may have to back down tcp_rwnd.
3022 3022 * The increment below won't work for us. So we set all three
3023 3023 * here and the increment below will have no effect.
3024 3024 */
3025 3025 tcp->tcp_rwnd = old_max_rwnd = rwnd;
3026 3026 }
3027 3027 if (tcp->tcp_localnet) {
3028 3028 tcp->tcp_rack_abs_max =
3029 3029 MIN(tcps->tcps_local_dacks_max, rwnd / mss / 2);
3030 3030 } else {
3031 3031 /*
3032 3032 * For a remote host on a different subnet (through a router),
3033 3033 * we ack every other packet to be conforming to RFC1122.
3034 3034 * tcp_deferred_acks_max is default to 2.
3035 3035 */
3036 3036 tcp->tcp_rack_abs_max =
3037 3037 MIN(tcps->tcps_deferred_acks_max, rwnd / mss / 2);
3038 3038 }
3039 3039 if (tcp->tcp_rack_cur_max > tcp->tcp_rack_abs_max)
3040 3040 tcp->tcp_rack_cur_max = tcp->tcp_rack_abs_max;
3041 3041 else
3042 3042 tcp->tcp_rack_cur_max = 0;
3043 3043 /*
3044 3044 * Increment the current rwnd by the amount the maximum grew (we
3045 3045 * can not overwrite it since we might be in the middle of a
3046 3046 * connection.)
3047 3047 */
3048 3048 tcp->tcp_rwnd += rwnd - old_max_rwnd;
3049 3049 connp->conn_rcvbuf = rwnd;
3050 3050
3051 3051 /* Are we already connected? */
3052 3052 if (tcp->tcp_tcpha != NULL) {
3053 3053 tcp->tcp_tcpha->tha_win =
3054 3054 htons(tcp->tcp_rwnd >> tcp->tcp_rcv_ws);
3055 3055 }
3056 3056
3057 3057 if ((tcp->tcp_rcv_ws > 0) && rwnd > tcp->tcp_cwnd_max)
3058 3058 tcp->tcp_cwnd_max = rwnd;
3059 3059
3060 3060 if (tcp_detached)
3061 3061 return (rwnd);
3062 3062
3063 3063 tcp_set_recv_threshold(tcp, rwnd >> 3);
3064 3064
3065 3065 (void) proto_set_rx_hiwat(connp->conn_rq, connp, rwnd);
3066 3066 return (rwnd);
3067 3067 }
3068 3068
3069 3069 int
3070 3070 tcp_do_unbind(conn_t *connp)
3071 3071 {
3072 3072 tcp_t *tcp = connp->conn_tcp;
3073 3073 int32_t oldstate;
3074 3074
3075 3075 switch (tcp->tcp_state) {
3076 3076 case TCPS_BOUND:
3077 3077 case TCPS_LISTEN:
3078 3078 break;
3079 3079 default:
3080 3080 return (-TOUTSTATE);
3081 3081 }
3082 3082
3083 3083 /*
3084 3084 * Need to clean up all the eagers since after the unbind, segments
3085 3085 * will no longer be delivered to this listener stream.
3086 3086 */
3087 3087 mutex_enter(&tcp->tcp_eager_lock);
3088 3088 if (tcp->tcp_conn_req_cnt_q0 != 0 || tcp->tcp_conn_req_cnt_q != 0) {
3089 3089 tcp_eager_cleanup(tcp, 0);
3090 3090 }
3091 3091 mutex_exit(&tcp->tcp_eager_lock);
3092 3092
3093 3093 /* Clean up the listener connection counter if necessary. */
3094 3094 if (tcp->tcp_listen_cnt != NULL)
3095 3095 TCP_DECR_LISTEN_CNT(tcp);
3096 3096 connp->conn_laddr_v6 = ipv6_all_zeros;
3097 3097 connp->conn_saddr_v6 = ipv6_all_zeros;
3098 3098 tcp_bind_hash_remove(tcp);
3099 3099 oldstate = tcp->tcp_state;
3100 3100 tcp->tcp_state = TCPS_IDLE;
3101 3101 DTRACE_TCP6(state__change, void, NULL, ip_xmit_attr_t *,
3102 3102 connp->conn_ixa, void, NULL, tcp_t *, tcp, void, NULL,
3103 3103 int32_t, oldstate);
3104 3104
3105 3105 ip_unbind(connp);
3106 3106 bzero(&connp->conn_ports, sizeof (connp->conn_ports));
3107 3107
3108 3108 return (0);
3109 3109 }
3110 3110
3111 3111 /*
3112 3112 * Collect protocol properties to send to the upper handle.
3113 3113 */
3114 3114 void
3115 3115 tcp_get_proto_props(tcp_t *tcp, struct sock_proto_props *sopp)
3116 3116 {
3117 3117 conn_t *connp = tcp->tcp_connp;
3118 3118
3119 3119 sopp->sopp_flags = SOCKOPT_RCVHIWAT | SOCKOPT_MAXBLK | SOCKOPT_WROFF;
3120 3120 sopp->sopp_maxblk = tcp_maxpsz_set(tcp, B_FALSE);
3121 3121
3122 3122 sopp->sopp_rxhiwat = tcp->tcp_fused ?
3123 3123 tcp_fuse_set_rcv_hiwat(tcp, connp->conn_rcvbuf) :
3124 3124 connp->conn_rcvbuf;
3125 3125 /*
3126 3126 * Determine what write offset value to use depending on SACK and
3127 3127 * whether the endpoint is fused or not.
3128 3128 */
3129 3129 if (tcp->tcp_fused) {
3130 3130 ASSERT(tcp->tcp_loopback);
3131 3131 ASSERT(tcp->tcp_loopback_peer != NULL);
3132 3132 /*
3133 3133 * For fused tcp loopback, set the stream head's write
3134 3134 * offset value to zero since we won't be needing any room
3135 3135 * for TCP/IP headers. This would also improve performance
3136 3136 * since it would reduce the amount of work done by kmem.
3137 3137 * Non-fused tcp loopback case is handled separately below.
3138 3138 */
3139 3139 sopp->sopp_wroff = 0;
3140 3140 /*
3141 3141 * Update the peer's transmit parameters according to
3142 3142 * our recently calculated high water mark value.
3143 3143 */
3144 3144 (void) tcp_maxpsz_set(tcp->tcp_loopback_peer, B_TRUE);
3145 3145 } else if (tcp->tcp_snd_sack_ok) {
3146 3146 sopp->sopp_wroff = connp->conn_ht_iphc_allocated +
3147 3147 (tcp->tcp_loopback ? 0 : tcp->tcp_tcps->tcps_wroff_xtra);
3148 3148 } else {
3149 3149 sopp->sopp_wroff = connp->conn_ht_iphc_len +
3150 3150 (tcp->tcp_loopback ? 0 : tcp->tcp_tcps->tcps_wroff_xtra);
3151 3151 }
3152 3152
3153 3153 if (tcp->tcp_loopback) {
3154 3154 sopp->sopp_flags |= SOCKOPT_LOOPBACK;
3155 3155 sopp->sopp_loopback = B_TRUE;
3156 3156 }
3157 3157 }
3158 3158
3159 3159 /*
3160 3160 * Check the usability of ZEROCOPY. It's instead checking the flag set by IP.
3161 3161 */
3162 3162 boolean_t
3163 3163 tcp_zcopy_check(tcp_t *tcp)
3164 3164 {
3165 3165 conn_t *connp = tcp->tcp_connp;
3166 3166 ip_xmit_attr_t *ixa = connp->conn_ixa;
3167 3167 boolean_t zc_enabled = B_FALSE;
3168 3168 tcp_stack_t *tcps = tcp->tcp_tcps;
3169 3169
3170 3170 if (do_tcpzcopy == 2)
3171 3171 zc_enabled = B_TRUE;
3172 3172 else if ((do_tcpzcopy == 1) && (ixa->ixa_flags & IXAF_ZCOPY_CAPAB))
3173 3173 zc_enabled = B_TRUE;
3174 3174
3175 3175 tcp->tcp_snd_zcopy_on = zc_enabled;
3176 3176 if (!TCP_IS_DETACHED(tcp)) {
3177 3177 if (zc_enabled) {
3178 3178 ixa->ixa_flags |= IXAF_VERIFY_ZCOPY;
3179 3179 (void) proto_set_tx_copyopt(connp->conn_rq, connp,
3180 3180 ZCVMSAFE);
3181 3181 TCP_STAT(tcps, tcp_zcopy_on);
3182 3182 } else {
3183 3183 ixa->ixa_flags &= ~IXAF_VERIFY_ZCOPY;
3184 3184 (void) proto_set_tx_copyopt(connp->conn_rq, connp,
3185 3185 ZCVMUNSAFE);
3186 3186 TCP_STAT(tcps, tcp_zcopy_off);
3187 3187 }
3188 3188 }
3189 3189 return (zc_enabled);
3190 3190 }
3191 3191
3192 3192 /*
3193 3193 * Backoff from a zero-copy message by copying data to a new allocated
3194 3194 * message and freeing the original desballoca'ed segmapped message.
3195 3195 *
3196 3196 * This function is called by following two callers:
3197 3197 * 1. tcp_timer: fix_xmitlist is set to B_TRUE, because it's safe to free
3198 3198 * the origial desballoca'ed message and notify sockfs. This is in re-
3199 3199 * transmit state.
3200 3200 * 2. tcp_output: fix_xmitlist is set to B_FALSE. Flag STRUIO_ZCNOTIFY need
3201 3201 * to be copied to new message.
3202 3202 */
3203 3203 mblk_t *
3204 3204 tcp_zcopy_backoff(tcp_t *tcp, mblk_t *bp, boolean_t fix_xmitlist)
3205 3205 {
3206 3206 mblk_t *nbp;
3207 3207 mblk_t *head = NULL;
3208 3208 mblk_t *tail = NULL;
3209 3209 tcp_stack_t *tcps = tcp->tcp_tcps;
3210 3210
3211 3211 ASSERT(bp != NULL);
3212 3212 while (bp != NULL) {
3213 3213 if (IS_VMLOANED_MBLK(bp)) {
3214 3214 TCP_STAT(tcps, tcp_zcopy_backoff);
3215 3215 if ((nbp = copyb(bp)) == NULL) {
3216 3216 tcp->tcp_xmit_zc_clean = B_FALSE;
3217 3217 if (tail != NULL)
3218 3218 tail->b_cont = bp;
3219 3219 return ((head == NULL) ? bp : head);
3220 3220 }
3221 3221
3222 3222 if (bp->b_datap->db_struioflag & STRUIO_ZCNOTIFY) {
3223 3223 if (fix_xmitlist)
3224 3224 tcp_zcopy_notify(tcp);
3225 3225 else
3226 3226 nbp->b_datap->db_struioflag |=
3227 3227 STRUIO_ZCNOTIFY;
3228 3228 }
3229 3229 nbp->b_cont = bp->b_cont;
3230 3230
3231 3231 /*
3232 3232 * Copy saved information and adjust tcp_xmit_tail
3233 3233 * if needed.
3234 3234 */
3235 3235 if (fix_xmitlist) {
3236 3236 nbp->b_prev = bp->b_prev;
3237 3237 nbp->b_next = bp->b_next;
3238 3238
3239 3239 if (tcp->tcp_xmit_tail == bp)
3240 3240 tcp->tcp_xmit_tail = nbp;
3241 3241 }
3242 3242
3243 3243 /* Free the original message. */
3244 3244 bp->b_prev = NULL;
3245 3245 bp->b_next = NULL;
3246 3246 freeb(bp);
3247 3247
3248 3248 bp = nbp;
3249 3249 }
3250 3250
3251 3251 if (head == NULL) {
3252 3252 head = bp;
3253 3253 }
3254 3254 if (tail == NULL) {
3255 3255 tail = bp;
3256 3256 } else {
3257 3257 tail->b_cont = bp;
3258 3258 tail = bp;
3259 3259 }
3260 3260
3261 3261 /* Move forward. */
3262 3262 bp = bp->b_cont;
3263 3263 }
3264 3264
3265 3265 if (fix_xmitlist) {
3266 3266 tcp->tcp_xmit_last = tail;
3267 3267 tcp->tcp_xmit_zc_clean = B_TRUE;
3268 3268 }
3269 3269
3270 3270 return (head);
3271 3271 }
3272 3272
3273 3273 void
3274 3274 tcp_zcopy_notify(tcp_t *tcp)
3275 3275 {
3276 3276 struct stdata *stp;
3277 3277 conn_t *connp;
3278 3278
3279 3279 if (tcp->tcp_detached)
3280 3280 return;
3281 3281 connp = tcp->tcp_connp;
3282 3282 if (IPCL_IS_NONSTR(connp)) {
3283 3283 (*connp->conn_upcalls->su_zcopy_notify)
3284 3284 (connp->conn_upper_handle);
3285 3285 return;
3286 3286 }
3287 3287 stp = STREAM(connp->conn_rq);
3288 3288 mutex_enter(&stp->sd_lock);
3289 3289 stp->sd_flag |= STZCNOTIFY;
3290 3290 cv_broadcast(&stp->sd_zcopy_wait);
3291 3291 mutex_exit(&stp->sd_lock);
3292 3292 }
3293 3293
3294 3294 /*
3295 3295 * Update the TCP connection according to change of LSO capability.
3296 3296 */
3297 3297 static void
3298 3298 tcp_update_lso(tcp_t *tcp, ip_xmit_attr_t *ixa)
3299 3299 {
3300 3300 /*
3301 3301 * We check against IPv4 header length to preserve the old behavior
3302 3302 * of only enabling LSO when there are no IP options.
3303 3303 * But this restriction might not be necessary at all. Before removing
3304 3304 * it, need to verify how LSO is handled for source routing case, with
3305 3305 * which IP does software checksum.
3306 3306 *
3307 3307 * For IPv6, whenever any extension header is needed, LSO is supressed.
3308 3308 */
3309 3309 if (ixa->ixa_ip_hdr_length != ((ixa->ixa_flags & IXAF_IS_IPV4) ?
3310 3310 IP_SIMPLE_HDR_LENGTH : IPV6_HDR_LEN))
3311 3311 return;
3312 3312
3313 3313 /*
3314 3314 * Either the LSO capability newly became usable, or it has changed.
3315 3315 */
3316 3316 if (ixa->ixa_flags & IXAF_LSO_CAPAB) {
3317 3317 ill_lso_capab_t *lsoc = &ixa->ixa_lso_capab;
3318 3318
3319 3319 ASSERT(lsoc->ill_lso_max > 0);
3320 3320 tcp->tcp_lso_max = MIN(TCP_MAX_LSO_LENGTH, lsoc->ill_lso_max);
3321 3321
3322 3322 DTRACE_PROBE3(tcp_update_lso, boolean_t, tcp->tcp_lso,
3323 3323 boolean_t, B_TRUE, uint32_t, tcp->tcp_lso_max);
3324 3324
3325 3325 /*
3326 3326 * If LSO to be enabled, notify the STREAM header with larger
3327 3327 * data block.
3328 3328 */
3329 3329 if (!tcp->tcp_lso)
3330 3330 tcp->tcp_maxpsz_multiplier = 0;
3331 3331
3332 3332 tcp->tcp_lso = B_TRUE;
3333 3333 TCP_STAT(tcp->tcp_tcps, tcp_lso_enabled);
3334 3334 } else { /* LSO capability is not usable any more. */
3335 3335 DTRACE_PROBE3(tcp_update_lso, boolean_t, tcp->tcp_lso,
3336 3336 boolean_t, B_FALSE, uint32_t, tcp->tcp_lso_max);
3337 3337
3338 3338 /*
3339 3339 * If LSO to be disabled, notify the STREAM header with smaller
3340 3340 * data block. And need to restore fragsize to PMTU.
3341 3341 */
3342 3342 if (tcp->tcp_lso) {
3343 3343 tcp->tcp_maxpsz_multiplier =
3344 3344 tcp->tcp_tcps->tcps_maxpsz_multiplier;
3345 3345 ixa->ixa_fragsize = ixa->ixa_pmtu;
3346 3346 tcp->tcp_lso = B_FALSE;
3347 3347 TCP_STAT(tcp->tcp_tcps, tcp_lso_disabled);
3348 3348 }
3349 3349 }
3350 3350
3351 3351 (void) tcp_maxpsz_set(tcp, B_TRUE);
3352 3352 }
3353 3353
3354 3354 /*
3355 3355 * Update the TCP connection according to change of ZEROCOPY capability.
3356 3356 */
3357 3357 static void
3358 3358 tcp_update_zcopy(tcp_t *tcp)
3359 3359 {
3360 3360 conn_t *connp = tcp->tcp_connp;
3361 3361 tcp_stack_t *tcps = tcp->tcp_tcps;
3362 3362
3363 3363 if (tcp->tcp_snd_zcopy_on) {
3364 3364 tcp->tcp_snd_zcopy_on = B_FALSE;
3365 3365 if (!TCP_IS_DETACHED(tcp)) {
3366 3366 (void) proto_set_tx_copyopt(connp->conn_rq, connp,
3367 3367 ZCVMUNSAFE);
3368 3368 TCP_STAT(tcps, tcp_zcopy_off);
3369 3369 }
3370 3370 } else {
3371 3371 tcp->tcp_snd_zcopy_on = B_TRUE;
3372 3372 if (!TCP_IS_DETACHED(tcp)) {
3373 3373 (void) proto_set_tx_copyopt(connp->conn_rq, connp,
3374 3374 ZCVMSAFE);
3375 3375 TCP_STAT(tcps, tcp_zcopy_on);
3376 3376 }
3377 3377 }
3378 3378 }
3379 3379
3380 3380 /*
3381 3381 * Notify function registered with ip_xmit_attr_t. It's called in the squeue
3382 3382 * so it's safe to update the TCP connection.
3383 3383 */
3384 3384 /* ARGSUSED1 */
3385 3385 static void
3386 3386 tcp_notify(void *arg, ip_xmit_attr_t *ixa, ixa_notify_type_t ntype,
3387 3387 ixa_notify_arg_t narg)
3388 3388 {
3389 3389 tcp_t *tcp = (tcp_t *)arg;
3390 3390 conn_t *connp = tcp->tcp_connp;
3391 3391
3392 3392 switch (ntype) {
3393 3393 case IXAN_LSO:
3394 3394 tcp_update_lso(tcp, connp->conn_ixa);
3395 3395 break;
3396 3396 case IXAN_PMTU:
3397 3397 tcp_update_pmtu(tcp, B_FALSE);
3398 3398 break;
3399 3399 case IXAN_ZCOPY:
3400 3400 tcp_update_zcopy(tcp);
3401 3401 break;
3402 3402 default:
3403 3403 break;
3404 3404 }
3405 3405 }
3406 3406
3407 3407 /*
3408 3408 * The TCP write service routine should never be called...
3409 3409 */
3410 3410 /* ARGSUSED */
3411 3411 static void
3412 3412 tcp_wsrv(queue_t *q)
3413 3413 {
3414 3414 tcp_stack_t *tcps = Q_TO_TCP(q)->tcp_tcps;
3415 3415
3416 3416 TCP_STAT(tcps, tcp_wsrv_called);
3417 3417 }
3418 3418
3419 3419 /*
3420 3420 * Hash list lookup routine for tcp_t structures.
3421 3421 * Returns with a CONN_INC_REF tcp structure. Caller must do a CONN_DEC_REF.
3422 3422 */
3423 3423 tcp_t *
3424 3424 tcp_acceptor_hash_lookup(t_uscalar_t id, tcp_stack_t *tcps)
3425 3425 {
3426 3426 tf_t *tf;
3427 3427 tcp_t *tcp;
3428 3428
3429 3429 tf = &tcps->tcps_acceptor_fanout[TCP_ACCEPTOR_HASH(id)];
3430 3430 mutex_enter(&tf->tf_lock);
3431 3431 for (tcp = tf->tf_tcp; tcp != NULL;
3432 3432 tcp = tcp->tcp_acceptor_hash) {
3433 3433 if (tcp->tcp_acceptor_id == id) {
3434 3434 CONN_INC_REF(tcp->tcp_connp);
3435 3435 mutex_exit(&tf->tf_lock);
3436 3436 return (tcp);
3437 3437 }
3438 3438 }
3439 3439 mutex_exit(&tf->tf_lock);
3440 3440 return (NULL);
3441 3441 }
3442 3442
3443 3443 /*
3444 3444 * Hash list insertion routine for tcp_t structures.
3445 3445 */
3446 3446 void
3447 3447 tcp_acceptor_hash_insert(t_uscalar_t id, tcp_t *tcp)
3448 3448 {
3449 3449 tf_t *tf;
3450 3450 tcp_t **tcpp;
3451 3451 tcp_t *tcpnext;
3452 3452 tcp_stack_t *tcps = tcp->tcp_tcps;
3453 3453
3454 3454 tf = &tcps->tcps_acceptor_fanout[TCP_ACCEPTOR_HASH(id)];
3455 3455
3456 3456 if (tcp->tcp_ptpahn != NULL)
3457 3457 tcp_acceptor_hash_remove(tcp);
3458 3458 tcpp = &tf->tf_tcp;
3459 3459 mutex_enter(&tf->tf_lock);
3460 3460 tcpnext = tcpp[0];
3461 3461 if (tcpnext)
3462 3462 tcpnext->tcp_ptpahn = &tcp->tcp_acceptor_hash;
3463 3463 tcp->tcp_acceptor_hash = tcpnext;
3464 3464 tcp->tcp_ptpahn = tcpp;
3465 3465 tcpp[0] = tcp;
3466 3466 tcp->tcp_acceptor_lockp = &tf->tf_lock; /* For tcp_*_hash_remove */
3467 3467 mutex_exit(&tf->tf_lock);
3468 3468 }
3469 3469
3470 3470 /*
3471 3471 * Hash list removal routine for tcp_t structures.
3472 3472 */
3473 3473 void
3474 3474 tcp_acceptor_hash_remove(tcp_t *tcp)
3475 3475 {
3476 3476 tcp_t *tcpnext;
3477 3477 kmutex_t *lockp;
3478 3478
3479 3479 /*
3480 3480 * Extract the lock pointer in case there are concurrent
3481 3481 * hash_remove's for this instance.
3482 3482 */
3483 3483 lockp = tcp->tcp_acceptor_lockp;
3484 3484
3485 3485 if (tcp->tcp_ptpahn == NULL)
3486 3486 return;
3487 3487
3488 3488 ASSERT(lockp != NULL);
3489 3489 mutex_enter(lockp);
3490 3490 if (tcp->tcp_ptpahn) {
3491 3491 tcpnext = tcp->tcp_acceptor_hash;
3492 3492 if (tcpnext) {
3493 3493 tcpnext->tcp_ptpahn = tcp->tcp_ptpahn;
3494 3494 tcp->tcp_acceptor_hash = NULL;
3495 3495 }
3496 3496 *tcp->tcp_ptpahn = tcpnext;
3497 3497 tcp->tcp_ptpahn = NULL;
3498 3498 }
3499 3499 mutex_exit(lockp);
3500 3500 tcp->tcp_acceptor_lockp = NULL;
3501 3501 }
3502 3502
3503 3503 /*
3504 3504 * Type three generator adapted from the random() function in 4.4 BSD:
3505 3505 */
3506 3506
3507 3507 /*
3508 3508 * Copyright (c) 1983, 1993
3509 3509 * The Regents of the University of California. All rights reserved.
3510 3510 *
3511 3511 * Redistribution and use in source and binary forms, with or without
3512 3512 * modification, are permitted provided that the following conditions
3513 3513 * are met:
3514 3514 * 1. Redistributions of source code must retain the above copyright
3515 3515 * notice, this list of conditions and the following disclaimer.
3516 3516 * 2. Redistributions in binary form must reproduce the above copyright
3517 3517 * notice, this list of conditions and the following disclaimer in the
3518 3518 * documentation and/or other materials provided with the distribution.
3519 3519 * 3. All advertising materials mentioning features or use of this software
3520 3520 * must display the following acknowledgement:
3521 3521 * This product includes software developed by the University of
3522 3522 * California, Berkeley and its contributors.
3523 3523 * 4. Neither the name of the University nor the names of its contributors
3524 3524 * may be used to endorse or promote products derived from this software
3525 3525 * without specific prior written permission.
3526 3526 *
3527 3527 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
3528 3528 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
3529 3529 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
3530 3530 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
3531 3531 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
3532 3532 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
3533 3533 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3534 3534 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
3535 3535 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
3536 3536 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
3537 3537 * SUCH DAMAGE.
3538 3538 */
3539 3539
3540 3540 /* Type 3 -- x**31 + x**3 + 1 */
3541 3541 #define DEG_3 31
3542 3542 #define SEP_3 3
3543 3543
3544 3544
3545 3545 /* Protected by tcp_random_lock */
3546 3546 static int tcp_randtbl[DEG_3 + 1];
3547 3547
3548 3548 static int *tcp_random_fptr = &tcp_randtbl[SEP_3 + 1];
3549 3549 static int *tcp_random_rptr = &tcp_randtbl[1];
3550 3550
3551 3551 static int *tcp_random_state = &tcp_randtbl[1];
3552 3552 static int *tcp_random_end_ptr = &tcp_randtbl[DEG_3 + 1];
3553 3553
3554 3554 kmutex_t tcp_random_lock;
3555 3555
3556 3556 void
3557 3557 tcp_random_init(void)
3558 3558 {
3559 3559 int i;
3560 3560 hrtime_t hrt;
3561 3561 time_t wallclock;
3562 3562 uint64_t result;
3563 3563
3564 3564 /*
3565 3565 * Use high-res timer and current time for seed. Gethrtime() returns
3566 3566 * a longlong, which may contain resolution down to nanoseconds.
3567 3567 * The current time will either be a 32-bit or a 64-bit quantity.
3568 3568 * XOR the two together in a 64-bit result variable.
3569 3569 * Convert the result to a 32-bit value by multiplying the high-order
3570 3570 * 32-bits by the low-order 32-bits.
3571 3571 */
3572 3572
3573 3573 hrt = gethrtime();
3574 3574 (void) drv_getparm(TIME, &wallclock);
3575 3575 result = (uint64_t)wallclock ^ (uint64_t)hrt;
3576 3576 mutex_enter(&tcp_random_lock);
3577 3577 tcp_random_state[0] = ((result >> 32) & 0xffffffff) *
3578 3578 (result & 0xffffffff);
3579 3579
3580 3580 for (i = 1; i < DEG_3; i++)
3581 3581 tcp_random_state[i] = 1103515245 * tcp_random_state[i - 1]
3582 3582 + 12345;
3583 3583 tcp_random_fptr = &tcp_random_state[SEP_3];
3584 3584 tcp_random_rptr = &tcp_random_state[0];
3585 3585 mutex_exit(&tcp_random_lock);
3586 3586 for (i = 0; i < 10 * DEG_3; i++)
3587 3587 (void) tcp_random();
3588 3588 }
3589 3589
3590 3590 /*
3591 3591 * tcp_random: Return a random number in the range [1 - (128K + 1)].
3592 3592 * This range is selected to be approximately centered on TCP_ISS / 2,
3593 3593 * and easy to compute. We get this value by generating a 32-bit random
3594 3594 * number, selecting out the high-order 17 bits, and then adding one so
3595 3595 * that we never return zero.
3596 3596 */
3597 3597 int
3598 3598 tcp_random(void)
3599 3599 {
3600 3600 int i;
3601 3601
3602 3602 mutex_enter(&tcp_random_lock);
3603 3603 *tcp_random_fptr += *tcp_random_rptr;
3604 3604
3605 3605 /*
3606 3606 * The high-order bits are more random than the low-order bits,
3607 3607 * so we select out the high-order 17 bits and add one so that
3608 3608 * we never return zero.
3609 3609 */
3610 3610 i = ((*tcp_random_fptr >> 15) & 0x1ffff) + 1;
3611 3611 if (++tcp_random_fptr >= tcp_random_end_ptr) {
3612 3612 tcp_random_fptr = tcp_random_state;
3613 3613 ++tcp_random_rptr;
3614 3614 } else if (++tcp_random_rptr >= tcp_random_end_ptr)
3615 3615 tcp_random_rptr = tcp_random_state;
3616 3616
3617 3617 mutex_exit(&tcp_random_lock);
3618 3618 return (i);
3619 3619 }
3620 3620
3621 3621 /*
3622 3622 * Split this function out so that if the secret changes, I'm okay.
3623 3623 *
3624 3624 * Initialize the tcp_iss_cookie and tcp_iss_key.
3625 3625 */
3626 3626
3627 3627 #define PASSWD_SIZE 16 /* MUST be multiple of 4 */
3628 3628
3629 3629 void
3630 3630 tcp_iss_key_init(uint8_t *phrase, int len, tcp_stack_t *tcps)
3631 3631 {
3632 3632 struct {
3633 3633 int32_t current_time;
3634 3634 uint32_t randnum;
3635 3635 uint16_t pad;
3636 3636 uint8_t ether[6];
3637 3637 uint8_t passwd[PASSWD_SIZE];
3638 3638 } tcp_iss_cookie;
3639 3639 time_t t;
3640 3640
3641 3641 /*
3642 3642 * Start with the current absolute time.
3643 3643 */
3644 3644 (void) drv_getparm(TIME, &t);
3645 3645 tcp_iss_cookie.current_time = t;
3646 3646
3647 3647 /*
3648 3648 * XXX - Need a more random number per RFC 1750, not this crap.
3649 3649 * OTOH, if what follows is pretty random, then I'm in better shape.
3650 3650 */
3651 3651 tcp_iss_cookie.randnum = (uint32_t)(gethrtime() + tcp_random());
3652 3652 tcp_iss_cookie.pad = 0x365c; /* Picked from HMAC pad values. */
3653 3653
3654 3654 /*
3655 3655 * The cpu_type_info is pretty non-random. Ugggh. It does serve
3656 3656 * as a good template.
3657 3657 */
3658 3658 bcopy(&cpu_list->cpu_type_info, &tcp_iss_cookie.passwd,
3659 3659 min(PASSWD_SIZE, sizeof (cpu_list->cpu_type_info)));
3660 3660
3661 3661 /*
3662 3662 * The pass-phrase. Normally this is supplied by user-called NDD.
3663 3663 */
3664 3664 bcopy(phrase, &tcp_iss_cookie.passwd, min(PASSWD_SIZE, len));
3665 3665
3666 3666 /*
3667 3667 * See 4010593 if this section becomes a problem again,
3668 3668 * but the local ethernet address is useful here.
3669 3669 */
3670 3670 (void) localetheraddr(NULL,
3671 3671 (struct ether_addr *)&tcp_iss_cookie.ether);
3672 3672
3673 3673 /*
3674 3674 * Hash 'em all together. The MD5Final is called per-connection.
3675 3675 */
3676 3676 mutex_enter(&tcps->tcps_iss_key_lock);
3677 3677 MD5Init(&tcps->tcps_iss_key);
3678 3678 MD5Update(&tcps->tcps_iss_key, (uchar_t *)&tcp_iss_cookie,
3679 3679 sizeof (tcp_iss_cookie));
3680 3680 mutex_exit(&tcps->tcps_iss_key_lock);
3681 3681 }
3682 3682
3683 3683 /*
3684 3684 * Called by IP when IP is loaded into the kernel
3685 3685 */
3686 3686 void
3687 3687 tcp_ddi_g_init(void)
3688 3688 {
3689 3689 tcp_timercache = kmem_cache_create("tcp_timercache",
3690 3690 sizeof (tcp_timer_t) + sizeof (mblk_t), 0,
3691 3691 NULL, NULL, NULL, NULL, NULL, 0);
3692 3692
3693 3693 tcp_notsack_blk_cache = kmem_cache_create("tcp_notsack_blk_cache",
3694 3694 sizeof (notsack_blk_t), 0, NULL, NULL, NULL, NULL, NULL, 0);
3695 3695
3696 3696 mutex_init(&tcp_random_lock, NULL, MUTEX_DEFAULT, NULL);
3697 3697
3698 3698 /* Initialize the random number generator */
3699 3699 tcp_random_init();
3700 3700
3701 3701 /* A single callback independently of how many netstacks we have */
3702 3702 ip_squeue_init(tcp_squeue_add);
3703 3703
3704 3704 tcp_g_kstat = tcp_g_kstat_init(&tcp_g_statistics);
3705 3705
3706 3706 tcp_squeue_flag = tcp_squeue_switch(tcp_squeue_wput);
3707 3707
3708 3708 /*
3709 3709 * We want to be informed each time a stack is created or
3710 3710 * destroyed in the kernel, so we can maintain the
3711 3711 * set of tcp_stack_t's.
3712 3712 */
3713 3713 netstack_register(NS_TCP, tcp_stack_init, NULL, tcp_stack_fini);
3714 3714 }
3715 3715
3716 3716
3717 3717 #define INET_NAME "ip"
3718 3718
3719 3719 /*
3720 3720 * Initialize the TCP stack instance.
3721 3721 */
3722 3722 static void *
3723 3723 tcp_stack_init(netstackid_t stackid, netstack_t *ns)
3724 3724 {
3725 3725 tcp_stack_t *tcps;
3726 3726 int i;
3727 3727 int error = 0;
3728 3728 major_t major;
3729 3729 size_t arrsz;
3730 3730
3731 3731 tcps = (tcp_stack_t *)kmem_zalloc(sizeof (*tcps), KM_SLEEP);
3732 3732 tcps->tcps_netstack = ns;
3733 3733
3734 3734 /* Initialize locks */
3735 3735 mutex_init(&tcps->tcps_iss_key_lock, NULL, MUTEX_DEFAULT, NULL);
3736 3736 mutex_init(&tcps->tcps_epriv_port_lock, NULL, MUTEX_DEFAULT, NULL);
3737 3737
3738 3738 tcps->tcps_g_num_epriv_ports = TCP_NUM_EPRIV_PORTS;
3739 3739 tcps->tcps_g_epriv_ports[0] = ULP_DEF_EPRIV_PORT1;
3740 3740 tcps->tcps_g_epriv_ports[1] = ULP_DEF_EPRIV_PORT2;
3741 3741 tcps->tcps_min_anonpriv_port = 512;
3742 3742
3743 3743 tcps->tcps_bind_fanout = kmem_zalloc(sizeof (tf_t) *
3744 3744 TCP_BIND_FANOUT_SIZE, KM_SLEEP);
3745 3745 tcps->tcps_acceptor_fanout = kmem_zalloc(sizeof (tf_t) *
3746 3746 TCP_ACCEPTOR_FANOUT_SIZE, KM_SLEEP);
3747 3747
3748 3748 for (i = 0; i < TCP_BIND_FANOUT_SIZE; i++) {
3749 3749 mutex_init(&tcps->tcps_bind_fanout[i].tf_lock, NULL,
3750 3750 MUTEX_DEFAULT, NULL);
3751 3751 }
3752 3752
3753 3753 for (i = 0; i < TCP_ACCEPTOR_FANOUT_SIZE; i++) {
3754 3754 mutex_init(&tcps->tcps_acceptor_fanout[i].tf_lock, NULL,
3755 3755 MUTEX_DEFAULT, NULL);
3756 3756 }
3757 3757
3758 3758 /* TCP's IPsec code calls the packet dropper. */
3759 3759 ip_drop_register(&tcps->tcps_dropper, "TCP IPsec policy enforcement");
3760 3760
3761 3761 arrsz = tcp_propinfo_count * sizeof (mod_prop_info_t);
3762 3762 tcps->tcps_propinfo_tbl = (mod_prop_info_t *)kmem_alloc(arrsz,
3763 3763 KM_SLEEP);
3764 3764 bcopy(tcp_propinfo_tbl, tcps->tcps_propinfo_tbl, arrsz);
3765 3765
3766 3766 /*
3767 3767 * Note: To really walk the device tree you need the devinfo
3768 3768 * pointer to your device which is only available after probe/attach.
3769 3769 * The following is safe only because it uses ddi_root_node()
3770 3770 */
3771 3771 tcp_max_optsize = optcom_max_optsize(tcp_opt_obj.odb_opt_des_arr,
3772 3772 tcp_opt_obj.odb_opt_arr_cnt);
3773 3773
3774 3774 /*
3775 3775 * Initialize RFC 1948 secret values. This will probably be reset once
3776 3776 * by the boot scripts.
3777 3777 *
3778 3778 * Use NULL name, as the name is caught by the new lockstats.
3779 3779 *
3780 3780 * Initialize with some random, non-guessable string, like the global
3781 3781 * T_INFO_ACK.
3782 3782 */
3783 3783
3784 3784 tcp_iss_key_init((uint8_t *)&tcp_g_t_info_ack,
3785 3785 sizeof (tcp_g_t_info_ack), tcps);
3786 3786
3787 3787 tcps->tcps_kstat = tcp_kstat2_init(stackid);
3788 3788 tcps->tcps_mibkp = tcp_kstat_init(stackid);
3789 3789
3790 3790 major = mod_name_to_major(INET_NAME);
3791 3791 error = ldi_ident_from_major(major, &tcps->tcps_ldi_ident);
3792 3792 ASSERT(error == 0);
3793 3793 tcps->tcps_ixa_cleanup_mp = allocb_wait(0, BPRI_MED, STR_NOSIG, NULL);
3794 3794 ASSERT(tcps->tcps_ixa_cleanup_mp != NULL);
3795 3795 cv_init(&tcps->tcps_ixa_cleanup_cv, NULL, CV_DEFAULT, NULL);
3796 3796 mutex_init(&tcps->tcps_ixa_cleanup_lock, NULL, MUTEX_DEFAULT, NULL);
3797 3797
3798 3798 mutex_init(&tcps->tcps_reclaim_lock, NULL, MUTEX_DEFAULT, NULL);
3799 3799 tcps->tcps_reclaim = B_FALSE;
3800 3800 tcps->tcps_reclaim_tid = 0;
3801 3801 tcps->tcps_reclaim_period = tcps->tcps_rexmit_interval_max;
3802 3802
3803 3803 /*
3804 3804 * ncpus is the current number of CPUs, which can be bigger than
3805 3805 * boot_ncpus. But we don't want to use ncpus to allocate all the
3806 3806 * tcp_stats_cpu_t at system boot up time since it will be 1. While
3807 3807 * we handle adding CPU in tcp_cpu_update(), it will be slow if
3808 3808 * there are many CPUs as we will be adding them 1 by 1.
3809 3809 *
3810 3810 * Note that tcps_sc_cnt never decreases and the tcps_sc[x] pointers
3811 3811 * are not freed until the stack is going away. So there is no need
3812 3812 * to grab a lock to access the per CPU tcps_sc[x] pointer.
3813 3813 */
3814 3814 mutex_enter(&cpu_lock);
3815 3815 tcps->tcps_sc_cnt = MAX(ncpus, boot_ncpus);
3816 3816 mutex_exit(&cpu_lock);
3817 3817 tcps->tcps_sc = kmem_zalloc(max_ncpus * sizeof (tcp_stats_cpu_t *),
3818 3818 KM_SLEEP);
3819 3819 for (i = 0; i < tcps->tcps_sc_cnt; i++) {
3820 3820 tcps->tcps_sc[i] = kmem_zalloc(sizeof (tcp_stats_cpu_t),
3821 3821 KM_SLEEP);
3822 3822 }
3823 3823
3824 3824 mutex_init(&tcps->tcps_listener_conf_lock, NULL, MUTEX_DEFAULT, NULL);
3825 3825 list_create(&tcps->tcps_listener_conf, sizeof (tcp_listener_t),
3826 3826 offsetof(tcp_listener_t, tl_link));
3827 3827
3828 3828 return (tcps);
3829 3829 }
3830 3830
3831 3831 /*
3832 3832 * Called when the IP module is about to be unloaded.
3833 3833 */
3834 3834 void
3835 3835 tcp_ddi_g_destroy(void)
3836 3836 {
3837 3837 tcp_g_kstat_fini(tcp_g_kstat);
3838 3838 tcp_g_kstat = NULL;
3839 3839 bzero(&tcp_g_statistics, sizeof (tcp_g_statistics));
3840 3840
3841 3841 mutex_destroy(&tcp_random_lock);
3842 3842
3843 3843 kmem_cache_destroy(tcp_timercache);
3844 3844 kmem_cache_destroy(tcp_notsack_blk_cache);
3845 3845
3846 3846 netstack_unregister(NS_TCP);
3847 3847 }
3848 3848
3849 3849 /*
3850 3850 * Free the TCP stack instance.
3851 3851 */
3852 3852 static void
3853 3853 tcp_stack_fini(netstackid_t stackid, void *arg)
3854 3854 {
3855 3855 tcp_stack_t *tcps = (tcp_stack_t *)arg;
3856 3856 int i;
3857 3857
3858 3858 freeb(tcps->tcps_ixa_cleanup_mp);
3859 3859 tcps->tcps_ixa_cleanup_mp = NULL;
3860 3860 cv_destroy(&tcps->tcps_ixa_cleanup_cv);
3861 3861 mutex_destroy(&tcps->tcps_ixa_cleanup_lock);
3862 3862
3863 3863 /*
3864 3864 * Set tcps_reclaim to false tells tcp_reclaim_timer() not to restart
3865 3865 * the timer.
3866 3866 */
3867 3867 mutex_enter(&tcps->tcps_reclaim_lock);
3868 3868 tcps->tcps_reclaim = B_FALSE;
3869 3869 mutex_exit(&tcps->tcps_reclaim_lock);
3870 3870 if (tcps->tcps_reclaim_tid != 0)
3871 3871 (void) untimeout(tcps->tcps_reclaim_tid);
3872 3872 mutex_destroy(&tcps->tcps_reclaim_lock);
3873 3873
3874 3874 tcp_listener_conf_cleanup(tcps);
3875 3875
3876 3876 for (i = 0; i < tcps->tcps_sc_cnt; i++)
3877 3877 kmem_free(tcps->tcps_sc[i], sizeof (tcp_stats_cpu_t));
3878 3878 kmem_free(tcps->tcps_sc, max_ncpus * sizeof (tcp_stats_cpu_t *));
3879 3879
3880 3880 kmem_free(tcps->tcps_propinfo_tbl,
3881 3881 tcp_propinfo_count * sizeof (mod_prop_info_t));
3882 3882 tcps->tcps_propinfo_tbl = NULL;
3883 3883
3884 3884 for (i = 0; i < TCP_BIND_FANOUT_SIZE; i++) {
3885 3885 ASSERT(tcps->tcps_bind_fanout[i].tf_tcp == NULL);
3886 3886 mutex_destroy(&tcps->tcps_bind_fanout[i].tf_lock);
3887 3887 }
3888 3888
3889 3889 for (i = 0; i < TCP_ACCEPTOR_FANOUT_SIZE; i++) {
3890 3890 ASSERT(tcps->tcps_acceptor_fanout[i].tf_tcp == NULL);
3891 3891 mutex_destroy(&tcps->tcps_acceptor_fanout[i].tf_lock);
3892 3892 }
3893 3893
3894 3894 kmem_free(tcps->tcps_bind_fanout, sizeof (tf_t) * TCP_BIND_FANOUT_SIZE);
3895 3895 tcps->tcps_bind_fanout = NULL;
3896 3896
3897 3897 kmem_free(tcps->tcps_acceptor_fanout, sizeof (tf_t) *
3898 3898 TCP_ACCEPTOR_FANOUT_SIZE);
3899 3899 tcps->tcps_acceptor_fanout = NULL;
3900 3900
3901 3901 mutex_destroy(&tcps->tcps_iss_key_lock);
3902 3902 mutex_destroy(&tcps->tcps_epriv_port_lock);
3903 3903
3904 3904 ip_drop_unregister(&tcps->tcps_dropper);
3905 3905
3906 3906 tcp_kstat2_fini(stackid, tcps->tcps_kstat);
3907 3907 tcps->tcps_kstat = NULL;
3908 3908
3909 3909 tcp_kstat_fini(stackid, tcps->tcps_mibkp);
3910 3910 tcps->tcps_mibkp = NULL;
3911 3911
3912 3912 ldi_ident_release(tcps->tcps_ldi_ident);
3913 3913 kmem_free(tcps, sizeof (*tcps));
3914 3914 }
3915 3915
3916 3916 /*
3917 3917 * Generate ISS, taking into account NDD changes may happen halfway through.
3918 3918 * (If the iss is not zero, set it.)
3919 3919 */
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3920 3920
3921 3921 static void
3922 3922 tcp_iss_init(tcp_t *tcp)
3923 3923 {
3924 3924 MD5_CTX context;
3925 3925 struct { uint32_t ports; in6_addr_t src; in6_addr_t dst; } arg;
3926 3926 uint32_t answer[4];
3927 3927 tcp_stack_t *tcps = tcp->tcp_tcps;
3928 3928 conn_t *connp = tcp->tcp_connp;
3929 3929
3930 - tcps->tcps_iss_incr_extra += (ISS_INCR >> 1);
3930 + tcps->tcps_iss_incr_extra += (tcps->tcps_iss_incr >> 1);
3931 3931 tcp->tcp_iss = tcps->tcps_iss_incr_extra;
3932 3932 switch (tcps->tcps_strong_iss) {
3933 3933 case 2:
3934 3934 mutex_enter(&tcps->tcps_iss_key_lock);
3935 3935 context = tcps->tcps_iss_key;
3936 3936 mutex_exit(&tcps->tcps_iss_key_lock);
3937 3937 arg.ports = connp->conn_ports;
3938 3938 arg.src = connp->conn_laddr_v6;
3939 3939 arg.dst = connp->conn_faddr_v6;
3940 3940 MD5Update(&context, (uchar_t *)&arg, sizeof (arg));
3941 3941 MD5Final((uchar_t *)answer, &context);
3942 3942 tcp->tcp_iss += answer[0] ^ answer[1] ^ answer[2] ^ answer[3];
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3943 3943 /*
3944 3944 * Now that we've hashed into a unique per-connection sequence
3945 3945 * space, add a random increment per strong_iss == 1. So I
3946 3946 * guess we'll have to...
3947 3947 */
3948 3948 /* FALLTHRU */
3949 3949 case 1:
3950 3950 tcp->tcp_iss += (gethrtime() >> ISS_NSEC_SHT) + tcp_random();
3951 3951 break;
3952 3952 default:
3953 - tcp->tcp_iss += (uint32_t)gethrestime_sec() * ISS_INCR;
3953 + tcp->tcp_iss += (uint32_t)gethrestime_sec() *
3954 + tcps->tcps_iss_incr;
3954 3955 break;
3955 3956 }
3956 3957 tcp->tcp_valid_bits = TCP_ISS_VALID;
3957 3958 tcp->tcp_fss = tcp->tcp_iss - 1;
3958 3959 tcp->tcp_suna = tcp->tcp_iss;
3959 3960 tcp->tcp_snxt = tcp->tcp_iss + 1;
3960 3961 tcp->tcp_rexmit_nxt = tcp->tcp_snxt;
3961 3962 tcp->tcp_csuna = tcp->tcp_snxt;
3962 3963 }
3963 3964
3964 3965 /*
3965 3966 * tcp_{set,clr}qfull() functions are used to either set or clear QFULL
3966 3967 * on the specified backing STREAMS q. Note, the caller may make the
3967 3968 * decision to call based on the tcp_t.tcp_flow_stopped value which
3968 3969 * when check outside the q's lock is only an advisory check ...
3969 3970 */
3970 3971 void
3971 3972 tcp_setqfull(tcp_t *tcp)
3972 3973 {
3973 3974 tcp_stack_t *tcps = tcp->tcp_tcps;
3974 3975 conn_t *connp = tcp->tcp_connp;
3975 3976
3976 3977 if (tcp->tcp_closed)
3977 3978 return;
3978 3979
3979 3980 conn_setqfull(connp, &tcp->tcp_flow_stopped);
3980 3981 if (tcp->tcp_flow_stopped)
3981 3982 TCP_STAT(tcps, tcp_flwctl_on);
3982 3983 }
3983 3984
3984 3985 void
3985 3986 tcp_clrqfull(tcp_t *tcp)
3986 3987 {
3987 3988 conn_t *connp = tcp->tcp_connp;
3988 3989
3989 3990 if (tcp->tcp_closed)
3990 3991 return;
3991 3992 conn_clrqfull(connp, &tcp->tcp_flow_stopped);
3992 3993 }
3993 3994
3994 3995 static int
3995 3996 tcp_squeue_switch(int val)
3996 3997 {
3997 3998 int rval = SQ_FILL;
3998 3999
3999 4000 switch (val) {
4000 4001 case 1:
4001 4002 rval = SQ_NODRAIN;
4002 4003 break;
4003 4004 case 2:
4004 4005 rval = SQ_PROCESS;
4005 4006 break;
4006 4007 default:
4007 4008 break;
4008 4009 }
4009 4010 return (rval);
4010 4011 }
4011 4012
4012 4013 /*
4013 4014 * This is called once for each squeue - globally for all stack
4014 4015 * instances.
4015 4016 */
4016 4017 static void
4017 4018 tcp_squeue_add(squeue_t *sqp)
4018 4019 {
4019 4020 tcp_squeue_priv_t *tcp_time_wait = kmem_zalloc(
4020 4021 sizeof (tcp_squeue_priv_t), KM_SLEEP);
4021 4022
4022 4023 *squeue_getprivate(sqp, SQPRIVATE_TCP) = (intptr_t)tcp_time_wait;
4023 4024 if (tcp_free_list_max_cnt == 0) {
4024 4025 int tcp_ncpus = ((boot_max_ncpus == -1) ?
4025 4026 max_ncpus : boot_max_ncpus);
4026 4027
4027 4028 /*
4028 4029 * Limit number of entries to 1% of availble memory / tcp_ncpus
4029 4030 */
4030 4031 tcp_free_list_max_cnt = (freemem * PAGESIZE) /
4031 4032 (tcp_ncpus * sizeof (tcp_t) * 100);
4032 4033 }
4033 4034 tcp_time_wait->tcp_free_list_cnt = 0;
4034 4035 }
4035 4036 /*
4036 4037 * Return unix error is tli error is TSYSERR, otherwise return a negative
4037 4038 * tli error.
4038 4039 */
4039 4040 int
4040 4041 tcp_do_bind(conn_t *connp, struct sockaddr *sa, socklen_t len, cred_t *cr,
4041 4042 boolean_t bind_to_req_port_only)
4042 4043 {
4043 4044 int error;
4044 4045 tcp_t *tcp = connp->conn_tcp;
4045 4046
4046 4047 if (tcp->tcp_state >= TCPS_BOUND) {
4047 4048 if (connp->conn_debug) {
4048 4049 (void) strlog(TCP_MOD_ID, 0, 1, SL_ERROR|SL_TRACE,
4049 4050 "tcp_bind: bad state, %d", tcp->tcp_state);
4050 4051 }
4051 4052 return (-TOUTSTATE);
4052 4053 }
4053 4054
4054 4055 error = tcp_bind_check(connp, sa, len, cr, bind_to_req_port_only);
4055 4056 if (error != 0)
4056 4057 return (error);
4057 4058
4058 4059 ASSERT(tcp->tcp_state == TCPS_BOUND);
4059 4060 tcp->tcp_conn_req_max = 0;
4060 4061 return (0);
4061 4062 }
4062 4063
4063 4064 /*
4064 4065 * If the return value from this function is positive, it's a UNIX error.
4065 4066 * Otherwise, if it's negative, then the absolute value is a TLI error.
4066 4067 * the TPI routine tcp_tpi_connect() is a wrapper function for this.
4067 4068 */
4068 4069 int
4069 4070 tcp_do_connect(conn_t *connp, const struct sockaddr *sa, socklen_t len,
4070 4071 cred_t *cr, pid_t pid)
4071 4072 {
4072 4073 tcp_t *tcp = connp->conn_tcp;
4073 4074 sin_t *sin = (sin_t *)sa;
4074 4075 sin6_t *sin6 = (sin6_t *)sa;
4075 4076 ipaddr_t *dstaddrp;
4076 4077 in_port_t dstport;
4077 4078 uint_t srcid;
4078 4079 int error;
4079 4080 uint32_t mss;
4080 4081 mblk_t *syn_mp;
4081 4082 tcp_stack_t *tcps = tcp->tcp_tcps;
4082 4083 int32_t oldstate;
4083 4084 ip_xmit_attr_t *ixa = connp->conn_ixa;
4084 4085
4085 4086 oldstate = tcp->tcp_state;
4086 4087
4087 4088 switch (len) {
4088 4089 default:
4089 4090 /*
4090 4091 * Should never happen
4091 4092 */
4092 4093 return (EINVAL);
4093 4094
4094 4095 case sizeof (sin_t):
4095 4096 sin = (sin_t *)sa;
4096 4097 if (sin->sin_port == 0) {
4097 4098 return (-TBADADDR);
4098 4099 }
4099 4100 if (connp->conn_ipv6_v6only) {
4100 4101 return (EAFNOSUPPORT);
4101 4102 }
4102 4103 break;
4103 4104
4104 4105 case sizeof (sin6_t):
4105 4106 sin6 = (sin6_t *)sa;
4106 4107 if (sin6->sin6_port == 0) {
4107 4108 return (-TBADADDR);
4108 4109 }
4109 4110 break;
4110 4111 }
4111 4112 /*
4112 4113 * If we're connecting to an IPv4-mapped IPv6 address, we need to
4113 4114 * make sure that the conn_ipversion is IPV4_VERSION. We
4114 4115 * need to this before we call tcp_bindi() so that the port lookup
4115 4116 * code will look for ports in the correct port space (IPv4 and
4116 4117 * IPv6 have separate port spaces).
4117 4118 */
4118 4119 if (connp->conn_family == AF_INET6 &&
4119 4120 connp->conn_ipversion == IPV6_VERSION &&
4120 4121 IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
4121 4122 if (connp->conn_ipv6_v6only)
4122 4123 return (EADDRNOTAVAIL);
4123 4124
4124 4125 connp->conn_ipversion = IPV4_VERSION;
4125 4126 }
4126 4127
4127 4128 switch (tcp->tcp_state) {
4128 4129 case TCPS_LISTEN:
4129 4130 /*
4130 4131 * Listening sockets are not allowed to issue connect().
4131 4132 */
4132 4133 if (IPCL_IS_NONSTR(connp))
4133 4134 return (EOPNOTSUPP);
4134 4135 /* FALLTHRU */
4135 4136 case TCPS_IDLE:
4136 4137 /*
4137 4138 * We support quick connect, refer to comments in
4138 4139 * tcp_connect_*()
4139 4140 */
4140 4141 /* FALLTHRU */
4141 4142 case TCPS_BOUND:
4142 4143 break;
4143 4144 default:
4144 4145 return (-TOUTSTATE);
4145 4146 }
4146 4147
4147 4148 /*
4148 4149 * We update our cred/cpid based on the caller of connect
4149 4150 */
4150 4151 if (connp->conn_cred != cr) {
4151 4152 crhold(cr);
4152 4153 crfree(connp->conn_cred);
4153 4154 connp->conn_cred = cr;
4154 4155 }
4155 4156 connp->conn_cpid = pid;
4156 4157
4157 4158 /* Cache things in the ixa without any refhold */
4158 4159 ASSERT(!(ixa->ixa_free_flags & IXA_FREE_CRED));
4159 4160 ixa->ixa_cred = cr;
4160 4161 ixa->ixa_cpid = pid;
4161 4162 if (is_system_labeled()) {
4162 4163 /* We need to restart with a label based on the cred */
4163 4164 ip_xmit_attr_restore_tsl(ixa, ixa->ixa_cred);
4164 4165 }
4165 4166
4166 4167 if (connp->conn_family == AF_INET6) {
4167 4168 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
4168 4169 error = tcp_connect_ipv6(tcp, &sin6->sin6_addr,
4169 4170 sin6->sin6_port, sin6->sin6_flowinfo,
4170 4171 sin6->__sin6_src_id, sin6->sin6_scope_id);
4171 4172 } else {
4172 4173 /*
4173 4174 * Destination adress is mapped IPv6 address.
4174 4175 * Source bound address should be unspecified or
4175 4176 * IPv6 mapped address as well.
4176 4177 */
4177 4178 if (!IN6_IS_ADDR_UNSPECIFIED(
4178 4179 &connp->conn_bound_addr_v6) &&
4179 4180 !IN6_IS_ADDR_V4MAPPED(&connp->conn_bound_addr_v6)) {
4180 4181 return (EADDRNOTAVAIL);
4181 4182 }
4182 4183 dstaddrp = &V4_PART_OF_V6((sin6->sin6_addr));
4183 4184 dstport = sin6->sin6_port;
4184 4185 srcid = sin6->__sin6_src_id;
4185 4186 error = tcp_connect_ipv4(tcp, dstaddrp, dstport,
4186 4187 srcid);
4187 4188 }
4188 4189 } else {
4189 4190 dstaddrp = &sin->sin_addr.s_addr;
4190 4191 dstport = sin->sin_port;
4191 4192 srcid = 0;
4192 4193 error = tcp_connect_ipv4(tcp, dstaddrp, dstport, srcid);
4193 4194 }
4194 4195
4195 4196 if (error != 0)
4196 4197 goto connect_failed;
4197 4198
4198 4199 CL_INET_CONNECT(connp, B_TRUE, error);
4199 4200 if (error != 0)
4200 4201 goto connect_failed;
4201 4202
4202 4203 /* connect succeeded */
4203 4204 TCPS_BUMP_MIB(tcps, tcpActiveOpens);
4204 4205 tcp->tcp_active_open = 1;
4205 4206
4206 4207 /*
4207 4208 * tcp_set_destination() does not adjust for TCP/IP header length.
4208 4209 */
4209 4210 mss = tcp->tcp_mss - connp->conn_ht_iphc_len;
4210 4211
4211 4212 /*
4212 4213 * Just make sure our rwnd is at least rcvbuf * MSS large, and round up
4213 4214 * to the nearest MSS.
4214 4215 *
4215 4216 * We do the round up here because we need to get the interface MTU
4216 4217 * first before we can do the round up.
4217 4218 */
4218 4219 tcp->tcp_rwnd = connp->conn_rcvbuf;
4219 4220 tcp->tcp_rwnd = MAX(MSS_ROUNDUP(tcp->tcp_rwnd, mss),
4220 4221 tcps->tcps_recv_hiwat_minmss * mss);
4221 4222 connp->conn_rcvbuf = tcp->tcp_rwnd;
4222 4223 tcp_set_ws_value(tcp);
4223 4224 tcp->tcp_tcpha->tha_win = htons(tcp->tcp_rwnd >> tcp->tcp_rcv_ws);
4224 4225 if (tcp->tcp_rcv_ws > 0 || tcps->tcps_wscale_always)
4225 4226 tcp->tcp_snd_ws_ok = B_TRUE;
4226 4227
4227 4228 /*
4228 4229 * Set tcp_snd_ts_ok to true
4229 4230 * so that tcp_xmit_mp will
4230 4231 * include the timestamp
4231 4232 * option in the SYN segment.
4232 4233 */
4233 4234 if (tcps->tcps_tstamp_always ||
4234 4235 (tcp->tcp_rcv_ws && tcps->tcps_tstamp_if_wscale)) {
4235 4236 tcp->tcp_snd_ts_ok = B_TRUE;
4236 4237 }
4237 4238
4238 4239 /*
4239 4240 * Note that tcp_snd_sack_ok can be set in tcp_set_destination() if
4240 4241 * the SACK metric is set. So here we just check the per stack SACK
4241 4242 * permitted param.
4242 4243 */
4243 4244 if (tcps->tcps_sack_permitted == 2) {
4244 4245 ASSERT(tcp->tcp_num_sack_blk == 0);
4245 4246 ASSERT(tcp->tcp_notsack_list == NULL);
4246 4247 tcp->tcp_snd_sack_ok = B_TRUE;
4247 4248 }
4248 4249
4249 4250 /*
4250 4251 * Should we use ECN? Note that the current
4251 4252 * default value (SunOS 5.9) of tcp_ecn_permitted
4252 4253 * is 1. The reason for doing this is that there
4253 4254 * are equipments out there that will drop ECN
4254 4255 * enabled IP packets. Setting it to 1 avoids
4255 4256 * compatibility problems.
4256 4257 */
4257 4258 if (tcps->tcps_ecn_permitted == 2)
4258 4259 tcp->tcp_ecn_ok = B_TRUE;
4259 4260
4260 4261 /* Trace change from BOUND -> SYN_SENT here */
4261 4262 DTRACE_TCP6(state__change, void, NULL, ip_xmit_attr_t *,
4262 4263 connp->conn_ixa, void, NULL, tcp_t *, tcp, void, NULL,
4263 4264 int32_t, TCPS_BOUND);
4264 4265
4265 4266 TCP_TIMER_RESTART(tcp, tcp->tcp_rto);
4266 4267 syn_mp = tcp_xmit_mp(tcp, NULL, 0, NULL, NULL,
4267 4268 tcp->tcp_iss, B_FALSE, NULL, B_FALSE);
4268 4269 if (syn_mp != NULL) {
4269 4270 /*
4270 4271 * We must bump the generation before sending the syn
4271 4272 * to ensure that we use the right generation in case
4272 4273 * this thread issues a "connected" up call.
4273 4274 */
4274 4275 SOCK_CONNID_BUMP(tcp->tcp_connid);
4275 4276 /*
4276 4277 * DTrace sending the first SYN as a
4277 4278 * tcp:::connect-request event.
4278 4279 */
4279 4280 DTRACE_TCP5(connect__request, mblk_t *, NULL,
4280 4281 ip_xmit_attr_t *, connp->conn_ixa,
4281 4282 void_ip_t *, syn_mp->b_rptr, tcp_t *, tcp,
4282 4283 tcph_t *,
4283 4284 &syn_mp->b_rptr[connp->conn_ixa->ixa_ip_hdr_length]);
4284 4285 tcp_send_data(tcp, syn_mp);
4285 4286 }
4286 4287
4287 4288 if (tcp->tcp_conn.tcp_opts_conn_req != NULL)
4288 4289 tcp_close_mpp(&tcp->tcp_conn.tcp_opts_conn_req);
4289 4290 return (0);
4290 4291
4291 4292 connect_failed:
4292 4293 connp->conn_faddr_v6 = ipv6_all_zeros;
4293 4294 connp->conn_fport = 0;
4294 4295 tcp->tcp_state = oldstate;
4295 4296 if (tcp->tcp_conn.tcp_opts_conn_req != NULL)
4296 4297 tcp_close_mpp(&tcp->tcp_conn.tcp_opts_conn_req);
4297 4298 return (error);
4298 4299 }
4299 4300
4300 4301 int
4301 4302 tcp_do_listen(conn_t *connp, struct sockaddr *sa, socklen_t len,
4302 4303 int backlog, cred_t *cr, boolean_t bind_to_req_port_only)
4303 4304 {
4304 4305 tcp_t *tcp = connp->conn_tcp;
4305 4306 int error = 0;
4306 4307 tcp_stack_t *tcps = tcp->tcp_tcps;
4307 4308 int32_t oldstate;
4308 4309
4309 4310 /* All Solaris components should pass a cred for this operation. */
4310 4311 ASSERT(cr != NULL);
4311 4312
4312 4313 if (tcp->tcp_state >= TCPS_BOUND) {
4313 4314 if ((tcp->tcp_state == TCPS_BOUND ||
4314 4315 tcp->tcp_state == TCPS_LISTEN) && backlog > 0) {
4315 4316 /*
4316 4317 * Handle listen() increasing backlog.
4317 4318 * This is more "liberal" then what the TPI spec
4318 4319 * requires but is needed to avoid a t_unbind
4319 4320 * when handling listen() since the port number
4320 4321 * might be "stolen" between the unbind and bind.
4321 4322 */
4322 4323 goto do_listen;
4323 4324 }
4324 4325 if (connp->conn_debug) {
4325 4326 (void) strlog(TCP_MOD_ID, 0, 1, SL_ERROR|SL_TRACE,
4326 4327 "tcp_listen: bad state, %d", tcp->tcp_state);
4327 4328 }
4328 4329 return (-TOUTSTATE);
4329 4330 } else {
4330 4331 if (sa == NULL) {
4331 4332 sin6_t addr;
4332 4333 sin_t *sin;
4333 4334 sin6_t *sin6;
4334 4335
4335 4336 ASSERT(IPCL_IS_NONSTR(connp));
4336 4337 /* Do an implicit bind: Request for a generic port. */
4337 4338 if (connp->conn_family == AF_INET) {
4338 4339 len = sizeof (sin_t);
4339 4340 sin = (sin_t *)&addr;
4340 4341 *sin = sin_null;
4341 4342 sin->sin_family = AF_INET;
4342 4343 } else {
4343 4344 ASSERT(connp->conn_family == AF_INET6);
4344 4345 len = sizeof (sin6_t);
4345 4346 sin6 = (sin6_t *)&addr;
4346 4347 *sin6 = sin6_null;
4347 4348 sin6->sin6_family = AF_INET6;
4348 4349 }
4349 4350 sa = (struct sockaddr *)&addr;
4350 4351 }
4351 4352
4352 4353 error = tcp_bind_check(connp, sa, len, cr,
4353 4354 bind_to_req_port_only);
4354 4355 if (error)
4355 4356 return (error);
4356 4357 /* Fall through and do the fanout insertion */
4357 4358 }
4358 4359
4359 4360 do_listen:
4360 4361 ASSERT(tcp->tcp_state == TCPS_BOUND || tcp->tcp_state == TCPS_LISTEN);
4361 4362 tcp->tcp_conn_req_max = backlog;
4362 4363 if (tcp->tcp_conn_req_max) {
4363 4364 if (tcp->tcp_conn_req_max < tcps->tcps_conn_req_min)
4364 4365 tcp->tcp_conn_req_max = tcps->tcps_conn_req_min;
4365 4366 if (tcp->tcp_conn_req_max > tcps->tcps_conn_req_max_q)
4366 4367 tcp->tcp_conn_req_max = tcps->tcps_conn_req_max_q;
4367 4368 /*
4368 4369 * If this is a listener, do not reset the eager list
4369 4370 * and other stuffs. Note that we don't check if the
4370 4371 * existing eager list meets the new tcp_conn_req_max
4371 4372 * requirement.
4372 4373 */
4373 4374 if (tcp->tcp_state != TCPS_LISTEN) {
4374 4375 tcp->tcp_state = TCPS_LISTEN;
4375 4376 DTRACE_TCP6(state__change, void, NULL, ip_xmit_attr_t *,
4376 4377 connp->conn_ixa, void, NULL, tcp_t *, tcp,
4377 4378 void, NULL, int32_t, TCPS_BOUND);
4378 4379 /* Initialize the chain. Don't need the eager_lock */
4379 4380 tcp->tcp_eager_next_q0 = tcp->tcp_eager_prev_q0 = tcp;
4380 4381 tcp->tcp_eager_next_drop_q0 = tcp;
4381 4382 tcp->tcp_eager_prev_drop_q0 = tcp;
4382 4383 tcp->tcp_second_ctimer_threshold =
4383 4384 tcps->tcps_ip_abort_linterval;
4384 4385 }
4385 4386 }
4386 4387
4387 4388 /*
4388 4389 * We need to make sure that the conn_recv is set to a non-null
4389 4390 * value before we insert the conn into the classifier table.
4390 4391 * This is to avoid a race with an incoming packet which does an
4391 4392 * ipcl_classify().
4392 4393 * We initially set it to tcp_input_listener_unbound to try to
4393 4394 * pick a good squeue for the listener when the first SYN arrives.
4394 4395 * tcp_input_listener_unbound sets it to tcp_input_listener on that
4395 4396 * first SYN.
4396 4397 */
4397 4398 connp->conn_recv = tcp_input_listener_unbound;
4398 4399
4399 4400 /* Insert the listener in the classifier table */
4400 4401 error = ip_laddr_fanout_insert(connp);
4401 4402 if (error != 0) {
4402 4403 /* Undo the bind - release the port number */
4403 4404 oldstate = tcp->tcp_state;
4404 4405 tcp->tcp_state = TCPS_IDLE;
4405 4406 DTRACE_TCP6(state__change, void, NULL, ip_xmit_attr_t *,
4406 4407 connp->conn_ixa, void, NULL, tcp_t *, tcp, void, NULL,
4407 4408 int32_t, oldstate);
4408 4409 connp->conn_bound_addr_v6 = ipv6_all_zeros;
4409 4410
4410 4411 connp->conn_laddr_v6 = ipv6_all_zeros;
4411 4412 connp->conn_saddr_v6 = ipv6_all_zeros;
4412 4413 connp->conn_ports = 0;
4413 4414
4414 4415 if (connp->conn_anon_port) {
4415 4416 zone_t *zone;
4416 4417
4417 4418 zone = crgetzone(cr);
4418 4419 connp->conn_anon_port = B_FALSE;
4419 4420 (void) tsol_mlp_anon(zone, connp->conn_mlp_type,
4420 4421 connp->conn_proto, connp->conn_lport, B_FALSE);
4421 4422 }
4422 4423 connp->conn_mlp_type = mlptSingle;
4423 4424
4424 4425 tcp_bind_hash_remove(tcp);
4425 4426 return (error);
4426 4427 } else {
4427 4428 /*
4428 4429 * If there is a connection limit, allocate and initialize
4429 4430 * the counter struct. Note that since listen can be called
4430 4431 * multiple times, the struct may have been allready allocated.
4431 4432 */
4432 4433 if (!list_is_empty(&tcps->tcps_listener_conf) &&
4433 4434 tcp->tcp_listen_cnt == NULL) {
4434 4435 tcp_listen_cnt_t *tlc;
4435 4436 uint32_t ratio;
4436 4437
4437 4438 ratio = tcp_find_listener_conf(tcps,
4438 4439 ntohs(connp->conn_lport));
4439 4440 if (ratio != 0) {
4440 4441 uint32_t mem_ratio, tot_buf;
4441 4442
4442 4443 tlc = kmem_alloc(sizeof (tcp_listen_cnt_t),
4443 4444 KM_SLEEP);
4444 4445 /*
4445 4446 * Calculate the connection limit based on
4446 4447 * the configured ratio and maxusers. Maxusers
4447 4448 * are calculated based on memory size,
4448 4449 * ~ 1 user per MB. Note that the conn_rcvbuf
4449 4450 * and conn_sndbuf may change after a
4450 4451 * connection is accepted. So what we have
4451 4452 * is only an approximation.
4452 4453 */
4453 4454 if ((tot_buf = connp->conn_rcvbuf +
4454 4455 connp->conn_sndbuf) < MB) {
4455 4456 mem_ratio = MB / tot_buf;
4456 4457 tlc->tlc_max = maxusers / ratio *
4457 4458 mem_ratio;
4458 4459 } else {
4459 4460 mem_ratio = tot_buf / MB;
4460 4461 tlc->tlc_max = maxusers / ratio /
4461 4462 mem_ratio;
4462 4463 }
4463 4464 /* At least we should allow two connections! */
4464 4465 if (tlc->tlc_max <= tcp_min_conn_listener)
4465 4466 tlc->tlc_max = tcp_min_conn_listener;
4466 4467 tlc->tlc_cnt = 1;
4467 4468 tlc->tlc_drop = 0;
4468 4469 tcp->tcp_listen_cnt = tlc;
4469 4470 }
4470 4471 }
4471 4472 }
4472 4473 return (error);
4473 4474 }
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