tcp: Reimplement TCP_FASTKEEP socket option using per-pcb keepidle
[dragonfly.git] / sys / netinet / tcp_usrreq.c
CommitLineData
984263bc 1/*
66d6c637
JH
2 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved.
3 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved.
f23061d4 4 *
66d6c637
JH
5 * This code is derived from software contributed to The DragonFly Project
6 * by Jeffrey M. Hsu.
f23061d4 7 *
66d6c637
JH
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of The DragonFly Project nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific, prior written permission.
f23061d4 19 *
66d6c637
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20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34/*
984263bc
MD
35 * Copyright (c) 1982, 1986, 1988, 1993
36 * The Regents of the University of California. All rights reserved.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. All advertising materials mentioning features or use of this software
47 * must display the following acknowledgement:
48 * This product includes software developed by the University of
49 * California, Berkeley and its contributors.
50 * 4. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
53 *
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64 * SUCH DAMAGE.
65 *
66 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94
67 * $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.51.2.17 2002/10/11 11:46:44 ume Exp $
68 */
69
70#include "opt_ipsec.h"
b1992928 71#include "opt_inet.h"
984263bc
MD
72#include "opt_inet6.h"
73#include "opt_tcpdebug.h"
74
75#include <sys/param.h>
76#include <sys/systm.h>
77#include <sys/kernel.h>
7fe56515 78#include <sys/malloc.h>
984263bc 79#include <sys/sysctl.h>
d371a63a
JH
80#include <sys/globaldata.h>
81#include <sys/thread.h>
82
984263bc
MD
83#include <sys/mbuf.h>
84#ifdef INET6
85#include <sys/domain.h>
86#endif /* INET6 */
87#include <sys/socket.h>
88#include <sys/socketvar.h>
89#include <sys/protosw.h>
90
1cae611f 91#include <sys/thread2.h>
7fe56515 92#include <sys/msgport2.h>
6cef7136 93#include <sys/socketvar2.h>
7fe56515 94
984263bc 95#include <net/if.h>
7fe56515 96#include <net/netisr.h>
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97#include <net/route.h>
98
4599cf19
MD
99#include <net/netmsg2.h>
100
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101#include <netinet/in.h>
102#include <netinet/in_systm.h>
103#ifdef INET6
104#include <netinet/ip6.h>
105#endif
106#include <netinet/in_pcb.h>
107#ifdef INET6
108#include <netinet6/in6_pcb.h>
109#endif
110#include <netinet/in_var.h>
111#include <netinet/ip_var.h>
112#ifdef INET6
113#include <netinet6/ip6_var.h>
65f3e756 114#include <netinet6/tcp6_var.h>
984263bc
MD
115#endif
116#include <netinet/tcp.h>
117#include <netinet/tcp_fsm.h>
118#include <netinet/tcp_seq.h>
119#include <netinet/tcp_timer.h>
a48c5dd5 120#include <netinet/tcp_timer2.h>
984263bc
MD
121#include <netinet/tcp_var.h>
122#include <netinet/tcpip.h>
123#ifdef TCPDEBUG
124#include <netinet/tcp_debug.h>
125#endif
126
127#ifdef IPSEC
128#include <netinet6/ipsec.h>
129#endif /*IPSEC*/
130
131/*
132 * TCP protocol interface to socket abstraction.
133 */
134extern char *tcpstates[]; /* XXX ??? */
135
e4700d00 136static int tcp_attach (struct socket *, struct pru_attach_info *);
002c1265 137static void tcp_connect (netmsg_t msg);
984263bc 138#ifdef INET6
002c1265
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139static void tcp6_connect (netmsg_t msg);
140static int tcp6_connect_oncpu(struct tcpcb *tp, int flags,
141 struct mbuf **mp,
48e7b118 142 struct sockaddr_in6 *sin6,
65f3e756 143 struct in6_addr *addr6);
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MD
144#endif /* INET6 */
145static struct tcpcb *
42a7fc75 146 tcp_disconnect (struct tcpcb *);
984263bc 147static struct tcpcb *
42a7fc75 148 tcp_usrclosed (struct tcpcb *);
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149
150#ifdef TCPDEBUG
151#define TCPDEBUG0 int ostate = 0
152#define TCPDEBUG1() ostate = tp ? tp->t_state : 0
153#define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
154 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
155#else
156#define TCPDEBUG0
157#define TCPDEBUG1()
158#define TCPDEBUG2(req)
159#endif
160
f12e9fad 161static int tcp_lport_extension = 1;
db26865d
SZ
162
163SYSCTL_INT(_net_inet_tcp, OID_AUTO, lportext, CTLFLAG_RW,
164 &tcp_lport_extension, 0, "");
165
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166/*
167 * TCP attaches to socket via pru_attach(), reserving space,
0ce0603e
MD
168 * and an internet control block. This is likely occuring on
169 * cpu0 and may have to move later when we bind/connect.
984263bc 170 */
002c1265
MD
171static void
172tcp_usr_attach(netmsg_t msg)
984263bc 173{
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174 struct socket *so = msg->base.nm_so;
175 struct pru_attach_info *ai = msg->attach.nm_ai;
984263bc 176 int error;
1cae611f 177 struct inpcb *inp;
4090d6ff 178 struct tcpcb *tp = NULL;
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MD
179 TCPDEBUG0;
180
6cef7136 181 soreference(so);
1cae611f 182 inp = so->so_pcb;
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MD
183 TCPDEBUG1();
184 if (inp) {
185 error = EISCONN;
186 goto out;
187 }
188
e4700d00 189 error = tcp_attach(so, ai);
984263bc
MD
190 if (error)
191 goto out;
192
193 if ((so->so_options & SO_LINGER) && so->so_linger == 0)
194 so->so_linger = TCP_LINGERTIME;
195 tp = sototcpcb(so);
196out:
6cef7136 197 sofree(so); /* from ref above */
984263bc 198 TCPDEBUG2(PRU_ATTACH);
002c1265 199 lwkt_replymsg(&msg->lmsg, error);
984263bc
MD
200}
201
202/*
203 * pru_detach() detaches the TCP protocol from the socket.
204 * If the protocol state is non-embryonic, then can't
205 * do this directly: have to initiate a pru_disconnect(),
206 * which may finish later; embryonic TCB's can just
207 * be discarded here.
208 */
002c1265
MD
209static void
210tcp_usr_detach(netmsg_t msg)
984263bc 211{
002c1265 212 struct socket *so = msg->base.nm_so;
984263bc 213 int error = 0;
1cae611f 214 struct inpcb *inp;
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215 struct tcpcb *tp;
216 TCPDEBUG0;
217
1cae611f 218 inp = so->so_pcb;
69891757
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219
220 /*
221 * If the inp is already detached it may have been due to an async
222 * close. Just return as if no error occured.
002c1265 223 *
621989fd
MD
224 * It's possible for the tcpcb (tp) to disconnect from the inp due
225 * to tcp_drop()->tcp_close() being called. This may occur *after*
226 * the detach message has been queued so we may find a NULL tp here.
227 */
002c1265
MD
228 if (inp) {
229 if ((tp = intotcpcb(inp)) != NULL) {
230 TCPDEBUG1();
231 tp = tcp_disconnect(tp);
232 TCPDEBUG2(PRU_DETACH);
233 }
621989fd 234 }
002c1265 235 lwkt_replymsg(&msg->lmsg, error);
984263bc
MD
236}
237
69891757 238/*
002c1265 239 * NOTE: ignore_error is non-zero for certain disconnection races
69891757
MD
240 * which we want to silently allow, otherwise close() may return
241 * an unexpected error.
002c1265
MD
242 *
243 * NOTE: The variables (msg) and (tp) are assumed.
69891757
MD
244 */
245#define COMMON_START(so, inp, ignore_error) \
002c1265
MD
246 TCPDEBUG0; \
247 \
248 inp = so->so_pcb; \
249 do { \
69891757 250 if (inp == NULL) { \
002c1265
MD
251 error = ignore_error ? 0 : EINVAL; \
252 tp = NULL; \
253 goto out; \
69891757
MD
254 } \
255 tp = intotcpcb(inp); \
256 TCPDEBUG1(); \
257 } while(0)
f23061d4 258
0ad8e15e 259#define COMMON_END1(req, noreply) \
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MD
260 out: do { \
261 TCPDEBUG2(req); \
0ad8e15e
SZ
262 if (!(noreply)) \
263 lwkt_replymsg(&msg->lmsg, error); \
002c1265
MD
264 return; \
265 } while(0)
984263bc 266
0ad8e15e
SZ
267#define COMMON_END(req) COMMON_END1((req), 0)
268
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269/*
270 * Give the socket an address.
271 */
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272static void
273tcp_usr_bind(netmsg_t msg)
984263bc 274{
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MD
275 struct socket *so = msg->bind.base.nm_so;
276 struct sockaddr *nam = msg->bind.nm_nam;
277 struct thread *td = msg->bind.nm_td;
984263bc 278 int error = 0;
1cae611f 279 struct inpcb *inp;
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280 struct tcpcb *tp;
281 struct sockaddr_in *sinp;
282
69891757 283 COMMON_START(so, inp, 0);
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284
285 /*
286 * Must check for multicast addresses and disallow binding
287 * to them.
288 */
289 sinp = (struct sockaddr_in *)nam;
290 if (sinp->sin_family == AF_INET &&
291 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
292 error = EAFNOSUPPORT;
293 goto out;
294 }
dadab5e9 295 error = in_pcbbind(inp, nam, td);
984263bc
MD
296 if (error)
297 goto out;
298 COMMON_END(PRU_BIND);
299
300}
301
302#ifdef INET6
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303
304static void
305tcp6_usr_bind(netmsg_t msg)
984263bc 306{
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307 struct socket *so = msg->bind.base.nm_so;
308 struct sockaddr *nam = msg->bind.nm_nam;
309 struct thread *td = msg->bind.nm_td;
984263bc 310 int error = 0;
1cae611f 311 struct inpcb *inp;
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MD
312 struct tcpcb *tp;
313 struct sockaddr_in6 *sin6p;
314
69891757 315 COMMON_START(so, inp, 0);
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316
317 /*
318 * Must check for multicast addresses and disallow binding
319 * to them.
320 */
321 sin6p = (struct sockaddr_in6 *)nam;
322 if (sin6p->sin6_family == AF_INET6 &&
323 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
324 error = EAFNOSUPPORT;
325 goto out;
326 }
327 inp->inp_vflag &= ~INP_IPV4;
328 inp->inp_vflag |= INP_IPV6;
329 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
330 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
331 inp->inp_vflag |= INP_IPV4;
332 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
333 struct sockaddr_in sin;
334
335 in6_sin6_2_sin(&sin, sin6p);
336 inp->inp_vflag |= INP_IPV4;
337 inp->inp_vflag &= ~INP_IPV6;
dadab5e9 338 error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
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339 goto out;
340 }
341 }
dadab5e9 342 error = in6_pcbbind(inp, nam, td);
984263bc
MD
343 if (error)
344 goto out;
345 COMMON_END(PRU_BIND);
346}
347#endif /* INET6 */
348
8affadf8 349#ifdef SMP
002c1265 350
8affadf8 351struct netmsg_inswildcard {
002c1265 352 struct netmsg_base base;
8affadf8 353 struct inpcb *nm_inp;
8affadf8
JH
354};
355
4599cf19 356static void
002c1265 357in_pcbinswildcardhash_handler(netmsg_t msg)
8affadf8 358{
002c1265 359 struct netmsg_inswildcard *nm = (struct netmsg_inswildcard *)msg;
8f9b2aed 360 int cpu = mycpuid, nextcpu;
8affadf8 361
8f9b2aed
SZ
362 in_pcbinswildcardhash_oncpu(nm->nm_inp, &tcbinfo[cpu]);
363
364 nextcpu = cpu + 1;
365 if (nextcpu < ncpus2)
366 lwkt_forwardmsg(cpu_portfn(nextcpu), &nm->base.lmsg);
367 else
368 lwkt_replymsg(&nm->base.lmsg, 0);
8affadf8 369}
002c1265 370
8affadf8
JH
371#endif
372
984263bc
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373/*
374 * Prepare to accept connections.
375 */
002c1265
MD
376static void
377tcp_usr_listen(netmsg_t msg)
984263bc 378{
002c1265
MD
379 struct socket *so = msg->listen.base.nm_so;
380 struct thread *td = msg->listen.nm_td;
984263bc 381 int error = 0;
1cae611f 382 struct inpcb *inp;
984263bc 383 struct tcpcb *tp;
8affadf8 384#ifdef SMP
8f9b2aed 385 struct netmsg_inswildcard nm;
8affadf8 386#endif
984263bc 387
69891757 388 COMMON_START(so, inp, 0);
f7b29de5
SZ
389
390 if (tp->t_flags & TF_LISTEN)
391 goto out;
392
8affadf8
JH
393 if (inp->inp_lport == 0) {
394 error = in_pcbbind(inp, NULL, td);
88d239e0 395 if (error)
8affadf8
JH
396 goto out;
397 }
398
399 tp->t_state = TCPS_LISTEN;
f7b29de5 400 tp->t_flags |= TF_LISTEN;
0f758523 401 tp->tt_msg = NULL; /* Catch any invalid timer usage */
8f9b2aed 402
8affadf8 403#ifdef SMP
985b2cb0
MD
404 if (ncpus > 1) {
405 /*
406 * We have to set the flag because we can't have other cpus
407 * messing with our inp's flags.
408 */
f78f8f4a
SZ
409 KASSERT(!(inp->inp_flags & INP_CONNECTED),
410 ("already on connhash\n"));
411 KASSERT(!(inp->inp_flags & INP_WILDCARD),
412 ("already on wildcardhash\n"));
413 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP),
414 ("already on MP wildcardhash\n"));
985b2cb0
MD
415 inp->inp_flags |= INP_WILDCARD_MP;
416
417 KKASSERT(so->so_port == cpu_portfn(0));
418 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
419 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]);
420
421 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
422 MSGF_PRIORITY, in_pcbinswildcardhash_handler);
423 nm.nm_inp = inp;
424 lwkt_domsg(cpu_portfn(1), &nm.base.lmsg, 0);
425 }
8affadf8 426#endif
8f9b2aed 427 in_pcbinswildcardhash(inp);
984263bc
MD
428 COMMON_END(PRU_LISTEN);
429}
430
431#ifdef INET6
002c1265
MD
432
433static void
434tcp6_usr_listen(netmsg_t msg)
984263bc 435{
002c1265
MD
436 struct socket *so = msg->listen.base.nm_so;
437 struct thread *td = msg->listen.nm_td;
984263bc 438 int error = 0;
1cae611f 439 struct inpcb *inp;
984263bc 440 struct tcpcb *tp;
00638fa3 441#ifdef SMP
8f9b2aed 442 struct netmsg_inswildcard nm;
00638fa3 443#endif
984263bc 444
69891757 445 COMMON_START(so, inp, 0);
f7b29de5
SZ
446
447 if (tp->t_flags & TF_LISTEN)
448 goto out;
449
984263bc 450 if (inp->inp_lport == 0) {
00638fa3 451 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY))
984263bc 452 inp->inp_vflag |= INP_IPV4;
00638fa3
JH
453 else
454 inp->inp_vflag &= ~INP_IPV4;
60233e58 455 error = in6_pcbbind(inp, NULL, td);
88d239e0
SZ
456 if (error)
457 goto out;
984263bc 458 }
88d239e0
SZ
459
460 tp->t_state = TCPS_LISTEN;
f7b29de5 461 tp->t_flags |= TF_LISTEN;
88d239e0
SZ
462 tp->tt_msg = NULL; /* Catch any invalid timer usage */
463
00638fa3 464#ifdef SMP
985b2cb0
MD
465 if (ncpus > 1) {
466 /*
467 * We have to set the flag because we can't have other cpus
468 * messing with our inp's flags.
469 */
f78f8f4a
SZ
470 KASSERT(!(inp->inp_flags & INP_CONNECTED),
471 ("already on connhash\n"));
472 KASSERT(!(inp->inp_flags & INP_WILDCARD),
473 ("already on wildcardhash\n"));
474 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP),
475 ("already on MP wildcardhash\n"));
985b2cb0
MD
476 inp->inp_flags |= INP_WILDCARD_MP;
477
478 KKASSERT(so->so_port == cpu_portfn(0));
479 KKASSERT(&curthread->td_msgport == cpu_portfn(0));
480 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]);
481
482 netmsg_init(&nm.base, NULL, &curthread->td_msgport,
483 MSGF_PRIORITY, in_pcbinswildcardhash_handler);
484 nm.nm_inp = inp;
485 lwkt_domsg(cpu_portfn(1), &nm.base.lmsg, 0);
486 }
00638fa3 487#endif
8f9b2aed 488 in_pcbinswildcardhash(inp);
984263bc
MD
489 COMMON_END(PRU_LISTEN);
490}
491#endif /* INET6 */
492
493/*
494 * Initiate connection to peer.
495 * Create a template for use in transmissions on this connection.
496 * Enter SYN_SENT state, and mark socket as connecting.
497 * Start keep-alive timer, and seed output sequence space.
498 * Send initial segment on connection.
499 */
002c1265
MD
500static void
501tcp_usr_connect(netmsg_t msg)
984263bc 502{
002c1265
MD
503 struct socket *so = msg->connect.base.nm_so;
504 struct sockaddr *nam = msg->connect.nm_nam;
505 struct thread *td = msg->connect.nm_td;
984263bc 506 int error = 0;
1cae611f 507 struct inpcb *inp;
984263bc
MD
508 struct tcpcb *tp;
509 struct sockaddr_in *sinp;
510
69891757 511 COMMON_START(so, inp, 0);
984263bc
MD
512
513 /*
514 * Must disallow TCP ``connections'' to multicast addresses.
515 */
516 sinp = (struct sockaddr_in *)nam;
517 if (sinp->sin_family == AF_INET
518 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
519 error = EAFNOSUPPORT;
520 goto out;
521 }
522
3e4150ef
VBD
523 if (!prison_remote_ip(td, (struct sockaddr*)sinp)) {
524 error = EAFNOSUPPORT; /* IPv6 only jail */
525 goto out;
526 }
984263bc 527
002c1265
MD
528 tcp_connect(msg);
529 /* msg is invalid now */
530 return;
531out:
532 if (msg->connect.nm_m) {
533 m_freem(msg->connect.nm_m);
534 msg->connect.nm_m = NULL;
535 }
536 lwkt_replymsg(&msg->lmsg, error);
984263bc
MD
537}
538
539#ifdef INET6
002c1265
MD
540
541static void
542tcp6_usr_connect(netmsg_t msg)
984263bc 543{
002c1265
MD
544 struct socket *so = msg->connect.base.nm_so;
545 struct sockaddr *nam = msg->connect.nm_nam;
546 struct thread *td = msg->connect.nm_td;
984263bc 547 int error = 0;
1cae611f 548 struct inpcb *inp;
984263bc
MD
549 struct tcpcb *tp;
550 struct sockaddr_in6 *sin6p;
551
69891757 552 COMMON_START(so, inp, 0);
984263bc
MD
553
554 /*
555 * Must disallow TCP ``connections'' to multicast addresses.
556 */
557 sin6p = (struct sockaddr_in6 *)nam;
558 if (sin6p->sin6_family == AF_INET6
559 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
560 error = EAFNOSUPPORT;
561 goto out;
562 }
563
3e4150ef
VBD
564 if (!prison_remote_ip(td, nam)) {
565 error = EAFNOSUPPORT; /* IPv4 only jail */
566 goto out;
567 }
568
984263bc 569 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
002c1265 570 struct sockaddr_in *sinp;
984263bc
MD
571
572 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
573 error = EINVAL;
574 goto out;
575 }
002c1265
MD
576 sinp = kmalloc(sizeof(*sinp), M_LWKTMSG, M_INTWAIT);
577 in6_sin6_2_sin(sinp, sin6p);
984263bc
MD
578 inp->inp_vflag |= INP_IPV4;
579 inp->inp_vflag &= ~INP_IPV6;
002c1265
MD
580 msg->connect.nm_nam = (struct sockaddr *)sinp;
581 msg->connect.nm_reconnect |= NMSG_RECONNECT_NAMALLOC;
582 tcp_connect(msg);
583 /* msg is invalid now */
584 return;
984263bc
MD
585 }
586 inp->inp_vflag &= ~INP_IPV4;
587 inp->inp_vflag |= INP_IPV6;
588 inp->inp_inc.inc_isipv6 = 1;
002c1265
MD
589
590 msg->connect.nm_reconnect |= NMSG_RECONNECT_FALLBACK;
591 tcp6_connect(msg);
592 /* msg is invalid now */
593 return;
594out:
595 if (msg->connect.nm_m) {
596 m_freem(msg->connect.nm_m);
597 msg->connect.nm_m = NULL;
598 }
599 lwkt_replymsg(&msg->lmsg, error);
984263bc 600}
002c1265 601
984263bc
MD
602#endif /* INET6 */
603
604/*
605 * Initiate disconnect from peer.
606 * If connection never passed embryonic stage, just drop;
607 * else if don't need to let data drain, then can just drop anyways,
608 * else have to begin TCP shutdown process: mark socket disconnecting,
609 * drain unread data, state switch to reflect user close, and
610 * send segment (e.g. FIN) to peer. Socket will be really disconnected
611 * when peer sends FIN and acks ours.
612 *
613 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
614 */
002c1265
MD
615static void
616tcp_usr_disconnect(netmsg_t msg)
984263bc 617{
002c1265 618 struct socket *so = msg->disconnect.base.nm_so;
984263bc 619 int error = 0;
1cae611f 620 struct inpcb *inp;
984263bc
MD
621 struct tcpcb *tp;
622
69891757 623 COMMON_START(so, inp, 1);
984263bc
MD
624 tp = tcp_disconnect(tp);
625 COMMON_END(PRU_DISCONNECT);
626}
627
628/*
629 * Accept a connection. Essentially all the work is
630 * done at higher levels; just return the address
631 * of the peer, storing through addr.
632 */
002c1265
MD
633static void
634tcp_usr_accept(netmsg_t msg)
984263bc 635{
002c1265
MD
636 struct socket *so = msg->accept.base.nm_so;
637 struct sockaddr **nam = msg->accept.nm_nam;
984263bc 638 int error = 0;
1cae611f 639 struct inpcb *inp;
984263bc
MD
640 struct tcpcb *tp = NULL;
641 TCPDEBUG0;
642
1cae611f 643 inp = so->so_pcb;
984263bc
MD
644 if (so->so_state & SS_ISDISCONNECTED) {
645 error = ECONNABORTED;
646 goto out;
647 }
002c1265
MD
648 if (inp == 0) {
649 error = EINVAL;
650 goto out;
651 }
6cef7136 652
984263bc
MD
653 tp = intotcpcb(inp);
654 TCPDEBUG1();
655 in_setpeeraddr(so, nam);
656 COMMON_END(PRU_ACCEPT);
657}
658
659#ifdef INET6
002c1265
MD
660static void
661tcp6_usr_accept(netmsg_t msg)
984263bc 662{
002c1265
MD
663 struct socket *so = msg->accept.base.nm_so;
664 struct sockaddr **nam = msg->accept.nm_nam;
984263bc 665 int error = 0;
1cae611f 666 struct inpcb *inp;
984263bc
MD
667 struct tcpcb *tp = NULL;
668 TCPDEBUG0;
669
1cae611f
MD
670 inp = so->so_pcb;
671
984263bc
MD
672 if (so->so_state & SS_ISDISCONNECTED) {
673 error = ECONNABORTED;
674 goto out;
675 }
002c1265
MD
676 if (inp == 0) {
677 error = EINVAL;
678 goto out;
679 }
984263bc
MD
680 tp = intotcpcb(inp);
681 TCPDEBUG1();
682 in6_mapped_peeraddr(so, nam);
683 COMMON_END(PRU_ACCEPT);
684}
685#endif /* INET6 */
686/*
687 * Mark the connection as being incapable of further output.
688 */
002c1265
MD
689static void
690tcp_usr_shutdown(netmsg_t msg)
984263bc 691{
002c1265 692 struct socket *so = msg->shutdown.base.nm_so;
984263bc 693 int error = 0;
1cae611f 694 struct inpcb *inp;
984263bc
MD
695 struct tcpcb *tp;
696
69891757 697 COMMON_START(so, inp, 0);
984263bc
MD
698 socantsendmore(so);
699 tp = tcp_usrclosed(tp);
700 if (tp)
701 error = tcp_output(tp);
702 COMMON_END(PRU_SHUTDOWN);
703}
704
705/*
706 * After a receive, possibly send window update to peer.
707 */
002c1265
MD
708static void
709tcp_usr_rcvd(netmsg_t msg)
984263bc 710{
002c1265 711 struct socket *so = msg->rcvd.base.nm_so;
984263bc 712 int error = 0;
1cae611f 713 struct inpcb *inp;
984263bc
MD
714 struct tcpcb *tp;
715
69891757 716 COMMON_START(so, inp, 0);
984263bc
MD
717 tcp_output(tp);
718 COMMON_END(PRU_RCVD);
719}
720
721/*
722 * Do a send by putting data in output queue and updating urgent
723 * marker if URG set. Possibly send more data. Unlike the other
724 * pru_*() routines, the mbuf chains are our responsibility. We
725 * must either enqueue them or free them. The other pru_* routines
726 * generally are caller-frees.
727 */
002c1265
MD
728static void
729tcp_usr_send(netmsg_t msg)
984263bc 730{
002c1265
MD
731 struct socket *so = msg->send.base.nm_so;
732 int flags = msg->send.nm_flags;
733 struct mbuf *m = msg->send.nm_m;
984263bc 734 int error = 0;
1cae611f 735 struct inpcb *inp;
984263bc 736 struct tcpcb *tp;
984263bc
MD
737 TCPDEBUG0;
738
7b7dc575
SZ
739 KKASSERT(msg->send.nm_control == NULL);
740 KKASSERT(msg->send.nm_addr == NULL);
741 KKASSERT((flags & PRUS_FREEADDR) == 0);
5bc42dd1 742
1cae611f
MD
743 inp = so->so_pcb;
744
984263bc
MD
745 if (inp == NULL) {
746 /*
747 * OOPS! we lost a race, the TCP session got reset after
748 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a
1cae611f 749 * network interrupt in the non-critical section of sosend().
984263bc 750 */
48e7b118 751 m_freem(m);
984263bc
MD
752 error = ECONNRESET; /* XXX EPIPE? */
753 tp = NULL;
754 TCPDEBUG1();
755 goto out;
756 }
984263bc
MD
757 tp = intotcpcb(inp);
758 TCPDEBUG1();
984263bc 759
8b0272b9
SZ
760#ifdef foo
761 /*
762 * This is no longer necessary, since:
763 * - sosendtcp() has already checked it for us
764 * - It does not work with asynchronized send
765 */
766
48e7b118
MD
767 /*
768 * Don't let too much OOB data build up
769 */
770 if (flags & PRUS_OOB) {
6d49aa6f 771 if (ssb_space(&so->so_snd) < -512) {
984263bc
MD
772 m_freem(m);
773 error = ENOBUFS;
774 goto out;
775 }
48e7b118 776 }
8b0272b9 777#endif
48e7b118
MD
778
779 /*
48e7b118
MD
780 * Pump the data into the socket.
781 */
782 if (m)
783 ssb_appendstream(&so->so_snd, m);
784 if (flags & PRUS_OOB) {
984263bc
MD
785 /*
786 * According to RFC961 (Assigned Protocols),
787 * the urgent pointer points to the last octet
788 * of urgent data. We continue, however,
789 * to consider it to indicate the first octet
790 * of data past the urgent section.
791 * Otherwise, snd_up should be one lower.
792 */
6d49aa6f 793 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
c1d3b892 794 tp->t_flags |= TF_FORCE;
984263bc 795 error = tcp_output(tp);
c1d3b892 796 tp->t_flags &= ~TF_FORCE;
48e7b118
MD
797 } else {
798 if (flags & PRUS_EOF) {
799 /*
800 * Close the send side of the connection after
801 * the data is sent.
802 */
803 socantsendmore(so);
804 tp = tcp_usrclosed(tp);
805 }
806 if (tp != NULL) {
807 if (flags & PRUS_MORETOCOME)
808 tp->t_flags |= TF_MORETOCOME;
809 error = tcp_output(tp);
810 if (flags & PRUS_MORETOCOME)
811 tp->t_flags &= ~TF_MORETOCOME;
812 }
984263bc 813 }
0ad8e15e
SZ
814 COMMON_END1((flags & PRUS_OOB) ? PRU_SENDOOB :
815 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND),
816 (flags & PRUS_NOREPLY));
984263bc
MD
817}
818
819/*
6cef7136
MD
820 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
821 * will sofree() it when we return.
984263bc 822 */
002c1265
MD
823static void
824tcp_usr_abort(netmsg_t msg)
984263bc 825{
002c1265 826 struct socket *so = msg->abort.base.nm_so;
984263bc 827 int error = 0;
1cae611f 828 struct inpcb *inp;
984263bc
MD
829 struct tcpcb *tp;
830
69891757 831 COMMON_START(so, inp, 1);
984263bc
MD
832 tp = tcp_drop(tp, ECONNABORTED);
833 COMMON_END(PRU_ABORT);
834}
835
836/*
837 * Receive out-of-band data.
838 */
002c1265
MD
839static void
840tcp_usr_rcvoob(netmsg_t msg)
984263bc 841{
002c1265
MD
842 struct socket *so = msg->rcvoob.base.nm_so;
843 struct mbuf *m = msg->rcvoob.nm_m;
844 int flags = msg->rcvoob.nm_flags;
984263bc 845 int error = 0;
1cae611f 846 struct inpcb *inp;
984263bc
MD
847 struct tcpcb *tp;
848
69891757 849 COMMON_START(so, inp, 0);
984263bc
MD
850 if ((so->so_oobmark == 0 &&
851 (so->so_state & SS_RCVATMARK) == 0) ||
852 so->so_options & SO_OOBINLINE ||
853 tp->t_oobflags & TCPOOB_HADDATA) {
854 error = EINVAL;
855 goto out;
856 }
857 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
858 error = EWOULDBLOCK;
859 goto out;
860 }
861 m->m_len = 1;
862 *mtod(m, caddr_t) = tp->t_iobc;
863 if ((flags & MSG_PEEK) == 0)
864 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
865 COMMON_END(PRU_RCVOOB);
866}
867
88da6203
SZ
868static void
869tcp_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
870{
871 in_savefaddr(so, faddr);
872}
873
68dc4251
SZ
874#ifdef INET6
875static void
876tcp6_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
877{
878 in6_mapped_savefaddr(so, faddr);
879}
880#endif
881
984263bc
MD
882/* xxx - should be const */
883struct pr_usrreqs tcp_usrreqs = {
fa5e758c
MD
884 .pru_abort = tcp_usr_abort,
885 .pru_accept = tcp_usr_accept,
886 .pru_attach = tcp_usr_attach,
887 .pru_bind = tcp_usr_bind,
888 .pru_connect = tcp_usr_connect,
002c1265
MD
889 .pru_connect2 = pr_generic_notsupp,
890 .pru_control = in_control_dispatch,
fa5e758c
MD
891 .pru_detach = tcp_usr_detach,
892 .pru_disconnect = tcp_usr_disconnect,
893 .pru_listen = tcp_usr_listen,
002c1265 894 .pru_peeraddr = in_setpeeraddr_dispatch,
fa5e758c
MD
895 .pru_rcvd = tcp_usr_rcvd,
896 .pru_rcvoob = tcp_usr_rcvoob,
897 .pru_send = tcp_usr_send,
898 .pru_sense = pru_sense_null,
899 .pru_shutdown = tcp_usr_shutdown,
002c1265 900 .pru_sockaddr = in_setsockaddr_dispatch,
5bc42dd1 901 .pru_sosend = sosendtcp,
88da6203
SZ
902 .pru_soreceive = soreceive,
903 .pru_savefaddr = tcp_usr_savefaddr
984263bc
MD
904};
905
906#ifdef INET6
907struct pr_usrreqs tcp6_usrreqs = {
fa5e758c
MD
908 .pru_abort = tcp_usr_abort,
909 .pru_accept = tcp6_usr_accept,
910 .pru_attach = tcp_usr_attach,
911 .pru_bind = tcp6_usr_bind,
912 .pru_connect = tcp6_usr_connect,
002c1265
MD
913 .pru_connect2 = pr_generic_notsupp,
914 .pru_control = in6_control_dispatch,
fa5e758c
MD
915 .pru_detach = tcp_usr_detach,
916 .pru_disconnect = tcp_usr_disconnect,
917 .pru_listen = tcp6_usr_listen,
002c1265 918 .pru_peeraddr = in6_mapped_peeraddr_dispatch,
fa5e758c
MD
919 .pru_rcvd = tcp_usr_rcvd,
920 .pru_rcvoob = tcp_usr_rcvoob,
921 .pru_send = tcp_usr_send,
922 .pru_sense = pru_sense_null,
923 .pru_shutdown = tcp_usr_shutdown,
002c1265 924 .pru_sockaddr = in6_mapped_sockaddr_dispatch,
5bc42dd1 925 .pru_sosend = sosendtcp,
68dc4251
SZ
926 .pru_soreceive = soreceive,
927 .pru_savefaddr = tcp6_usr_savefaddr
984263bc
MD
928};
929#endif /* INET6 */
930
984263bc 931static int
48e7b118
MD
932tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m,
933 struct sockaddr_in *sin, struct sockaddr_in *if_sin)
984263bc
MD
934{
935 struct inpcb *inp = tp->t_inpcb, *oinp;
936 struct socket *so = inp->inp_socket;
03fb1cae 937 struct route *ro = &inp->inp_route;
984263bc 938
7fe56515 939 oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid],
002c1265
MD
940 sin->sin_addr, sin->sin_port,
941 (inp->inp_laddr.s_addr != INADDR_ANY ?
942 inp->inp_laddr : if_sin->sin_addr),
943 inp->inp_lport, 0, NULL);
13d8907a 944 if (oinp != NULL) {
27b8aee3
AE
945 m_freem(m);
946 return (EADDRINUSE);
984263bc
MD
947 }
948 if (inp->inp_laddr.s_addr == INADDR_ANY)
13d8907a 949 inp->inp_laddr = if_sin->sin_addr;
984263bc
MD
950 inp->inp_faddr = sin->sin_addr;
951 inp->inp_fport = sin->sin_port;
7fe56515 952 inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid];
13d8907a 953 in_pcbinsconnhash(inp);
984263bc 954
03fb1cae
SZ
955 /*
956 * We are now on the inpcb's owner CPU, if the cached route was
957 * freed because the rtentry's owner CPU is not the current CPU
958 * (e.g. in tcp_connect()), then we try to reallocate it here with
959 * the hope that a rtentry may be cloned from a RTF_PRCLONING
960 * rtentry.
961 */
962 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
963 ro->ro_rt == NULL) {
964 bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
965 ro->ro_dst.sa_family = AF_INET;
966 ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
967 ((struct sockaddr_in *)&ro->ro_dst)->sin_addr =
968 sin->sin_addr;
969 rtalloc(ro);
970 }
971
3db1c8a3 972 /*
48e7b118
MD
973 * Now that no more errors can occur, change the protocol processing
974 * port to the current thread (which is the correct thread).
975 *
3db1c8a3
SZ
976 * Create TCP timer message now; we are on the tcpcb's owner
977 * CPU/thread.
978 */
979 tcp_create_timermsg(tp, &curthread->td_msgport);
0f758523 980
46e92930
MD
981 /*
982 * Compute window scaling to request. Use a larger scaling then
983 * needed for the initial receive buffer in case the receive buffer
984 * gets expanded.
985 */
986 if (tp->request_r_scale < TCP_MIN_WINSHIFT)
987 tp->request_r_scale = TCP_MIN_WINSHIFT;
984263bc 988 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
46e92930
MD
989 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat
990 ) {
984263bc 991 tp->request_r_scale++;
46e92930 992 }
984263bc
MD
993
994 soisconnecting(so);
995 tcpstat.tcps_connattempt++;
996 tp->t_state = TCPS_SYN_SENT;
2ce132be 997 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
984263bc 998 tp->iss = tcp_new_isn(tp);
984263bc 999 tcp_sendseqinit(tp);
48e7b118
MD
1000 if (m) {
1001 ssb_appendstream(&so->so_snd, m);
1002 m = NULL;
1003 if (flags & PRUS_OOB)
1004 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1005 }
984263bc
MD
1006
1007 /*
48e7b118
MD
1008 * Close the send side of the connection after
1009 * the data is sent if flagged.
1010 */
1011 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1012 socantsendmore(so);
1013 tp = tcp_usrclosed(tp);
1014 }
1015 return (tcp_output(tp));
984263bc
MD
1016}
1017
7fe56515
JH
1018/*
1019 * Common subroutine to open a TCP connection to remote host specified
1020 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
1021 * port number if needed. Call in_pcbladdr to do the routing and to choose
27b8aee3 1022 * a local host address (interface).
7fe56515
JH
1023 * Initialize connection parameters and enter SYN-SENT state.
1024 */
002c1265
MD
1025static void
1026tcp_connect(netmsg_t msg)
7fe56515 1027{
002c1265
MD
1028 struct socket *so = msg->connect.base.nm_so;
1029 struct sockaddr *nam = msg->connect.nm_nam;
1030 struct thread *td = msg->connect.nm_td;
7fe56515
JH
1031 struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1032 struct sockaddr_in *if_sin;
002c1265
MD
1033 struct inpcb *inp;
1034 struct tcpcb *tp;
4fd40da5 1035 int error, calc_laddr = 1;
540a0bf0 1036#ifdef SMP
7fe56515
JH
1037 lwkt_port_t port;
1038#endif
1039
002c1265
MD
1040 COMMON_START(so, inp, 0);
1041
1042 /*
1043 * Reconnect our pcb if we have to
1044 */
1045 if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
1046 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
1047 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1048 }
1049
9c7b7c43
SZ
1050 /*
1051 * Bind if we have to
1052 */
1053 if (inp->inp_lport == 0) {
1054 if (tcp_lport_extension) {
db26865d
SZ
1055 KKASSERT(inp->inp_laddr.s_addr == INADDR_ANY);
1056
1057 error = in_pcbladdr(inp, nam, &if_sin, td);
1058 if (error)
1059 goto out;
1060 inp->inp_laddr.s_addr = if_sin->sin_addr.s_addr;
1061
1062 error = in_pcbconn_bind(inp, nam, td);
1063 if (error)
1064 goto out;
4fd40da5
SZ
1065
1066 calc_laddr = 0;
9c7b7c43 1067 } else {
db26865d
SZ
1068 error = in_pcbbind(inp, NULL, td);
1069 if (error)
1070 goto out;
1071 }
4fd40da5 1072 }
db26865d 1073
4fd40da5 1074 if (calc_laddr) {
db26865d
SZ
1075 /*
1076 * Calculate the correct protocol processing thread. The
1077 * connect operation must run there. Set the forwarding
1078 * port before we forward the message or it will get bounced
1079 * right back to us.
1080 */
1081 error = in_pcbladdr(inp, nam, &if_sin, td);
002c1265
MD
1082 if (error)
1083 goto out;
7fe56515 1084 }
b25d27f4
SZ
1085 KKASSERT(inp->inp_socket == so);
1086
540a0bf0 1087#ifdef SMP
7fe56515 1088 port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port,
002c1265
MD
1089 (inp->inp_laddr.s_addr ?
1090 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr),
1091 inp->inp_lport);
7fe56515 1092
fb0f29c4 1093 if (port != &curthread->td_msgport) {
a46456f3
SZ
1094 struct route *ro = &inp->inp_route;
1095
1096 /*
1097 * in_pcbladdr() may have allocated a route entry for us
1098 * on the current CPU, but we need a route entry on the
03fb1cae 1099 * inpcb's owner CPU, so free it here.
a46456f3
SZ
1100 */
1101 if (ro->ro_rt != NULL)
1102 RTFREE(ro->ro_rt);
1103 bzero(ro, sizeof(*ro));
540a0bf0 1104
48e7b118 1105 /*
0ce0603e
MD
1106 * We are moving the protocol processing port the socket
1107 * is on, we have to unlink here and re-link on the
1108 * target cpu.
48e7b118 1109 */
0ce0603e
MD
1110 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1111 sosetport(so, port);
002c1265
MD
1112 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1113 msg->connect.base.nm_dispatch = tcp_connect;
0ce0603e 1114
002c1265
MD
1115 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1116 /* msg invalid now */
1117 return;
48e7b118
MD
1118 }
1119#else
0ce0603e 1120 KKASSERT(so->so_port == &curthread->td_msgport);
7fe56515 1121#endif
002c1265
MD
1122 error = tcp_connect_oncpu(tp, msg->connect.nm_flags,
1123 msg->connect.nm_m, sin, if_sin);
1124 msg->connect.nm_m = NULL;
1125out:
1126 if (msg->connect.nm_m) {
1127 m_freem(msg->connect.nm_m);
1128 msg->connect.nm_m = NULL;
1129 }
1130 if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) {
1131 kfree(msg->connect.nm_nam, M_LWKTMSG);
1132 msg->connect.nm_nam = NULL;
1133 }
1134 lwkt_replymsg(&msg->connect.base.lmsg, error);
1135 /* msg invalid now */
7fe56515
JH
1136}
1137
984263bc 1138#ifdef INET6
65f3e756 1139
002c1265
MD
1140static void
1141tcp6_connect(netmsg_t msg)
984263bc 1142{
002c1265
MD
1143 struct tcpcb *tp;
1144 struct socket *so = msg->connect.base.nm_so;
1145 struct sockaddr *nam = msg->connect.nm_nam;
1146 struct thread *td = msg->connect.nm_td;
1147 struct inpcb *inp;
984263bc
MD
1148 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1149 struct in6_addr *addr6;
f890e67a 1150#ifdef SMP
65f3e756 1151 lwkt_port_t port;
f890e67a 1152#endif
984263bc
MD
1153 int error;
1154
002c1265
MD
1155 COMMON_START(so, inp, 0);
1156
1157 /*
1158 * Reconnect our pcb if we have to
1159 */
1160 if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) {
1161 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT;
1162 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1163 }
1164
1165 /*
1166 * Bind if we have to
1167 */
984263bc 1168 if (inp->inp_lport == 0) {
60233e58 1169 error = in6_pcbbind(inp, NULL, td);
002c1265
MD
1170 if (error)
1171 goto out;
984263bc
MD
1172 }
1173
1174 /*
1175 * Cannot simply call in_pcbconnect, because there might be an
1176 * earlier incarnation of this same connection still in
1177 * TIME_WAIT state, creating an ADDRINUSE error.
1178 */
3e4150ef 1179 error = in6_pcbladdr(inp, nam, &addr6, td);
002c1265
MD
1180 if (error)
1181 goto out;
65f3e756
MD
1182
1183#ifdef SMP
1184 port = tcp6_addrport(); /* XXX hack for now, always cpu0 */
1185
1186 if (port != &curthread->td_msgport) {
65f3e756
MD
1187 struct route *ro = &inp->inp_route;
1188
1189 /*
1190 * in_pcbladdr() may have allocated a route entry for us
1191 * on the current CPU, but we need a route entry on the
1192 * inpcb's owner CPU, so free it here.
1193 */
1194 if (ro->ro_rt != NULL)
1195 RTFREE(ro->ro_rt);
1196 bzero(ro, sizeof(*ro));
1197
002c1265
MD
1198 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1199 sosetport(so, port);
1200 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1201 msg->connect.base.nm_dispatch = tcp6_connect;
1202
1203 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1204 /* msg invalid now */
1205 return;
48e7b118 1206 }
65f3e756 1207#endif
002c1265
MD
1208 error = tcp6_connect_oncpu(tp, msg->connect.nm_flags,
1209 &msg->connect.nm_m, sin6, addr6);
1210 /* nm_m may still be intact */
1211out:
1212 if (error && (msg->connect.nm_reconnect & NMSG_RECONNECT_FALLBACK)) {
1213 tcp_connect(msg);
1214 /* msg invalid now */
1215 } else {
1216 if (msg->connect.nm_m) {
1217 m_freem(msg->connect.nm_m);
1218 msg->connect.nm_m = NULL;
1219 }
1220 if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) {
1221 kfree(msg->connect.nm_nam, M_LWKTMSG);
1222 msg->connect.nm_nam = NULL;
1223 }
1224 lwkt_replymsg(&msg->connect.base.lmsg, error);
1225 /* msg invalid now */
1226 }
65f3e756
MD
1227}
1228
1229static int
002c1265 1230tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf **mp,
48e7b118 1231 struct sockaddr_in6 *sin6, struct in6_addr *addr6)
65f3e756 1232{
002c1265 1233 struct mbuf *m = *mp;
65f3e756
MD
1234 struct inpcb *inp = tp->t_inpcb;
1235 struct socket *so = inp->inp_socket;
1236 struct inpcb *oinp;
65f3e756 1237
48e7b118
MD
1238 /*
1239 * Cannot simply call in_pcbconnect, because there might be an
1240 * earlier incarnation of this same connection still in
1241 * TIME_WAIT state, creating an ADDRINUSE error.
1242 */
7fe56515 1243 oinp = in6_pcblookup_hash(inp->inp_cpcbinfo,
984263bc 1244 &sin6->sin6_addr, sin6->sin6_port,
002c1265
MD
1245 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ?
1246 addr6 : &inp->in6p_laddr),
984263bc 1247 inp->inp_lport, 0, NULL);
002c1265 1248 if (oinp)
27b8aee3 1249 return (EADDRINUSE);
002c1265 1250
984263bc
MD
1251 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1252 inp->in6p_laddr = *addr6;
1253 inp->in6p_faddr = sin6->sin6_addr;
1254 inp->inp_fport = sin6->sin6_port;
3641b7ca 1255 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0)
984263bc 1256 inp->in6p_flowinfo = sin6->sin6_flowinfo;
13d8907a 1257 in_pcbinsconnhash(inp);
984263bc 1258
48e7b118
MD
1259 /*
1260 * Now that no more errors can occur, change the protocol processing
1261 * port to the current thread (which is the correct thread).
1262 *
1263 * Create TCP timer message now; we are on the tcpcb's owner
1264 * CPU/thread.
1265 */
3db1c8a3
SZ
1266 tcp_create_timermsg(tp, &curthread->td_msgport);
1267
984263bc 1268 /* Compute window scaling to request. */
46e92930
MD
1269 if (tp->request_r_scale < TCP_MIN_WINSHIFT)
1270 tp->request_r_scale = TCP_MIN_WINSHIFT;
984263bc 1271 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
46e92930 1272 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) {
984263bc 1273 tp->request_r_scale++;
46e92930 1274 }
984263bc
MD
1275
1276 soisconnecting(so);
1277 tcpstat.tcps_connattempt++;
1278 tp->t_state = TCPS_SYN_SENT;
2ce132be 1279 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
984263bc 1280 tp->iss = tcp_new_isn(tp);
984263bc 1281 tcp_sendseqinit(tp);
48e7b118
MD
1282 if (m) {
1283 ssb_appendstream(&so->so_snd, m);
002c1265 1284 *mp = NULL;
48e7b118
MD
1285 if (flags & PRUS_OOB)
1286 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1287 }
984263bc
MD
1288
1289 /*
48e7b118
MD
1290 * Close the send side of the connection after
1291 * the data is sent if flagged.
1292 */
1293 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) {
1294 socantsendmore(so);
1295 tp = tcp_usrclosed(tp);
1296 }
1297 return (tcp_output(tp));
984263bc 1298}
65f3e756 1299
984263bc
MD
1300#endif /* INET6 */
1301
1302/*
1303 * The new sockopt interface makes it possible for us to block in the
1cae611f
MD
1304 * copyin/out step (if we take a page fault). Taking a page fault while
1305 * in a critical section is probably a Bad Thing. (Since sockets and pcbs
1306 * both now use TSM, there probably isn't any need for this function to
1307 * run in a critical section any more. This needs more examination.)
984263bc 1308 */
002c1265
MD
1309void
1310tcp_ctloutput(netmsg_t msg)
984263bc 1311{
002c1265
MD
1312 struct socket *so = msg->base.nm_so;
1313 struct sockopt *sopt = msg->ctloutput.nm_sopt;
2ce132be 1314 int error, opt, optval, opthz;
984263bc
MD
1315 struct inpcb *inp;
1316 struct tcpcb *tp;
1317
1318 error = 0;
ed894f8c 1319 inp = so->so_pcb;
002c1265
MD
1320 if (inp == NULL) {
1321 error = ECONNRESET;
1322 goto done;
1323 }
6cef7136 1324
984263bc
MD
1325 if (sopt->sopt_level != IPPROTO_TCP) {
1326#ifdef INET6
1327 if (INP_CHECK_SOCKAF(so, AF_INET6))
002c1265 1328 ip6_ctloutput_dispatch(msg);
984263bc
MD
1329 else
1330#endif /* INET6 */
002c1265
MD
1331 ip_ctloutput(msg);
1332 /* msg invalid now */
1333 return;
984263bc
MD
1334 }
1335 tp = intotcpcb(inp);
1336
1337 switch (sopt->sopt_dir) {
1338 case SOPT_SET:
e71a125f
AE
1339 error = soopt_to_kbuf(sopt, &optval, sizeof optval,
1340 sizeof optval);
1341 if (error)
1342 break;
984263bc 1343 switch (sopt->sopt_name) {
2a0c7c52 1344 case TCP_FASTKEEP:
fb8d5c6d
SZ
1345 if (optval > 0)
1346 tp->t_keepidle = tp->t_keepintvl;
1347 else
1348 tp->t_keepidle = tcp_keepidle;
1349 tcp_timer_keep_activity(tp, 0);
2a0c7c52 1350 break;
b1992928
MD
1351#ifdef TCP_SIGNATURE
1352 case TCP_SIGNATURE_ENABLE:
d0be4e27
SZ
1353 if (tp->t_state == TCPS_CLOSED) {
1354 /*
1355 * This is the only safe state that this
1356 * option could be changed. Some segments
1357 * could already have been sent in other
1358 * states.
1359 */
1360 if (optval > 0)
1361 tp->t_flags |= TF_SIGNATURE;
1362 else
1363 tp->t_flags &= ~TF_SIGNATURE;
1364 } else {
1365 error = EOPNOTSUPP;
1366 }
b1992928
MD
1367 break;
1368#endif /* TCP_SIGNATURE */
984263bc
MD
1369 case TCP_NODELAY:
1370 case TCP_NOOPT:
984263bc
MD
1371 switch (sopt->sopt_name) {
1372 case TCP_NODELAY:
1373 opt = TF_NODELAY;
1374 break;
1375 case TCP_NOOPT:
1376 opt = TF_NOOPT;
1377 break;
1378 default:
1379 opt = 0; /* dead code to fool gcc */
1380 break;
1381 }
1382
1383 if (optval)
1384 tp->t_flags |= opt;
1385 else
1386 tp->t_flags &= ~opt;
1387 break;
1388
1389 case TCP_NOPUSH:
984263bc
MD
1390 if (optval)
1391 tp->t_flags |= TF_NOPUSH;
1392 else {
1393 tp->t_flags &= ~TF_NOPUSH;
1394 error = tcp_output(tp);
1395 }
1396 break;
1397
1398 case TCP_MAXSEG:
153d34ac
MD
1399 /*
1400 * Must be between 0 and maxseg. If the requested
1401 * maxseg is too small to satisfy the desired minmss,
1402 * pump it up (silently so sysctl modifications of
1403 * minmss do not create unexpected program failures).
1404 * Handle degenerate cases.
1405 */
1406 if (optval > 0 && optval <= tp->t_maxseg) {
1407 if (optval + 40 < tcp_minmss) {
1408 optval = tcp_minmss - 40;
1409 if (optval < 0)
1410 optval = 1;
1411 }
984263bc 1412 tp->t_maxseg = optval;
153d34ac 1413 } else {
984263bc 1414 error = EINVAL;
153d34ac 1415 }
984263bc
MD
1416 break;
1417
2ce132be
SZ
1418 case TCP_KEEPINIT:
1419 opthz = ((int64_t)optval * hz) / 1000;
1420 if (opthz >= 1)
1421 tp->t_keepinit = opthz;
1422 else
1423 error = EINVAL;
1424 break;
1425
7ea3a353
SZ
1426 case TCP_KEEPIDLE:
1427 opthz = ((int64_t)optval * hz) / 1000;
0a2b0c05 1428 if (opthz >= 1) {
7ea3a353 1429 tp->t_keepidle = opthz;
0a2b0c05
SZ
1430 tcp_timer_keep_activity(tp, 0);
1431 } else {
7ea3a353 1432 error = EINVAL;
0a2b0c05 1433 }
7ea3a353
SZ
1434 break;
1435
5d61ded3
SZ
1436 case TCP_KEEPINTVL:
1437 opthz = ((int64_t)optval * hz) / 1000;
1438 if (opthz >= 1) {
1439 tp->t_keepintvl = opthz;
1440 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt;
1441 } else {
1442 error = EINVAL;
1443 }
1444 break;
1445
1446 case TCP_KEEPCNT:
1447 if (optval > 0) {
1448 tp->t_keepcnt = optval;
1449 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt;
1450 } else {
1451 error = EINVAL;
1452 }
1453 break;
1454
984263bc
MD
1455 default:
1456 error = ENOPROTOOPT;
1457 break;
1458 }
1459 break;
1460
1461 case SOPT_GET:
1462 switch (sopt->sopt_name) {
b1992928
MD
1463#ifdef TCP_SIGNATURE
1464 case TCP_SIGNATURE_ENABLE:
1465 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1466 break;
1467#endif /* TCP_SIGNATURE */
984263bc
MD
1468 case TCP_NODELAY:
1469 optval = tp->t_flags & TF_NODELAY;
1470 break;
1471 case TCP_MAXSEG:
1472 optval = tp->t_maxseg;
1473 break;
1474 case TCP_NOOPT:
1475 optval = tp->t_flags & TF_NOOPT;
1476 break;
1477 case TCP_NOPUSH:
1478 optval = tp->t_flags & TF_NOPUSH;
1479 break;
2ce132be
SZ
1480 case TCP_KEEPINIT:
1481 optval = ((int64_t)tp->t_keepinit * 1000) / hz;
1482 break;
7ea3a353
SZ
1483 case TCP_KEEPIDLE:
1484 optval = ((int64_t)tp->t_keepidle * 1000) / hz;
1485 break;
5d61ded3
SZ
1486 case TCP_KEEPINTVL:
1487 optval = ((int64_t)tp->t_keepintvl * 1000) / hz;
1488 break;
1489 case TCP_KEEPCNT:
1490 optval = tp->t_keepcnt;
1491 break;
984263bc
MD
1492 default:
1493 error = ENOPROTOOPT;
1494 break;
1495 }
1496 if (error == 0)
e71a125f 1497 soopt_from_kbuf(sopt, &optval, sizeof optval);
984263bc
MD
1498 break;
1499 }
002c1265
MD
1500done:
1501 lwkt_replymsg(&msg->lmsg, error);
984263bc
MD
1502}
1503
1504/*
1505 * tcp_sendspace and tcp_recvspace are the default send and receive window
1506 * sizes, respectively. These are obsolescent (this information should
1507 * be set by the route).
0560a274
MD
1508 *
1509 * Use a default that does not require tcp window scaling to be turned
1510 * on. Individual programs or the administrator can increase the default.
984263bc 1511 */
0560a274 1512u_long tcp_sendspace = 57344; /* largest multiple of PAGE_SIZE < 64k */
f23061d4 1513SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
984263bc
MD
1514 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1515u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */
f23061d4 1516SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
984263bc
MD
1517 &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1518
1519/*
0ce0603e
MD
1520 * Attach TCP protocol to socket, allocating internet protocol control
1521 * block, tcp control block, bufer space, and entering LISTEN state
1522 * if to accept connections.
984263bc
MD
1523 */
1524static int
e4700d00 1525tcp_attach(struct socket *so, struct pru_attach_info *ai)
984263bc 1526{
2256ba69 1527 struct tcpcb *tp;
984263bc
MD
1528 struct inpcb *inp;
1529 int error;
6ca1a1cd 1530 int cpu;
984263bc 1531#ifdef INET6
3641b7ca 1532 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
984263bc
MD
1533#endif
1534
6d49aa6f 1535 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
6cef7136 1536 lwkt_gettoken(&so->so_rcv.ssb_token);
e4700d00
JH
1537 error = soreserve(so, tcp_sendspace, tcp_recvspace,
1538 ai->sb_rlimit);
6cef7136 1539 lwkt_reltoken(&so->so_rcv.ssb_token);
984263bc
MD
1540 if (error)
1541 return (error);
1542 }
14343ad3
MD
1543 atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE);
1544 atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE);
6ca1a1cd 1545 cpu = mycpu->gd_cpuid;
0ce0603e
MD
1546
1547 /*
1548 * Set the default port for protocol processing. This will likely
1549 * change when we connect.
1550 */
6ca1a1cd 1551 error = in_pcballoc(so, &tcbinfo[cpu]);
984263bc
MD
1552 if (error)
1553 return (error);
ed894f8c 1554 inp = so->so_pcb;
984263bc
MD
1555#ifdef INET6
1556 if (isipv6) {
1557 inp->inp_vflag |= INP_IPV6;
1558 inp->in6p_hops = -1; /* use kernel default */
1559 }
1560 else
1561#endif
1562 inp->inp_vflag |= INP_IPV4;
1563 tp = tcp_newtcpcb(inp);
6cef7136
MD
1564 if (tp == NULL) {
1565 /*
1566 * Make sure the socket is destroyed by the pcbdetach.
1567 */
1568 soreference(so);
984263bc
MD
1569#ifdef INET6
1570 if (isipv6)
1571 in6_pcbdetach(inp);
1572 else
1573#endif
1574 in_pcbdetach(inp);
6cef7136 1575 sofree(so); /* from ref above */
984263bc
MD
1576 return (ENOBUFS);
1577 }
1578 tp->t_state = TCPS_CLOSED;
1579 return (0);
1580}
1581
1582/*
1583 * Initiate (or continue) disconnect.
1584 * If embryonic state, just send reset (once).
1585 * If in ``let data drain'' option and linger null, just drop.
1586 * Otherwise (hard), mark socket disconnecting and drop
1587 * current input data; switch states based on user close, and
1588 * send segment to peer (with FIN).
1589 */
1590static struct tcpcb *
f3f70f0d 1591tcp_disconnect(struct tcpcb *tp)
984263bc
MD
1592{
1593 struct socket *so = tp->t_inpcb->inp_socket;
1594
6cef7136 1595 if (tp->t_state < TCPS_ESTABLISHED) {
984263bc 1596 tp = tcp_close(tp);
6cef7136 1597 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
984263bc 1598 tp = tcp_drop(tp, 0);
6cef7136
MD
1599 } else {
1600 lwkt_gettoken(&so->so_rcv.ssb_token);
984263bc 1601 soisdisconnecting(so);
6d49aa6f 1602 sbflush(&so->so_rcv.sb);
984263bc
MD
1603 tp = tcp_usrclosed(tp);
1604 if (tp)
f23061d4 1605 tcp_output(tp);
6cef7136 1606 lwkt_reltoken(&so->so_rcv.ssb_token);
984263bc
MD
1607 }
1608 return (tp);
1609}
1610
1611/*
1612 * User issued close, and wish to trail through shutdown states:
1613 * if never received SYN, just forget it. If got a SYN from peer,
1614 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1615 * If already got a FIN from peer, then almost done; go to LAST_ACK
1616 * state. In all other cases, have already sent FIN to peer (e.g.
1617 * after PRU_SHUTDOWN), and just have to play tedious game waiting
1618 * for peer to send FIN or not respond to keep-alives, etc.
1619 * We can let the user exit from the close as soon as the FIN is acked.
1620 */
1621static struct tcpcb *
f3f70f0d 1622tcp_usrclosed(struct tcpcb *tp)
984263bc
MD
1623{
1624
1625 switch (tp->t_state) {
1626
1627 case TCPS_CLOSED:
1628 case TCPS_LISTEN:
1629 tp->t_state = TCPS_CLOSED;
1630 tp = tcp_close(tp);
1631 break;
1632
1633 case TCPS_SYN_SENT:
1634 case TCPS_SYN_RECEIVED:
1635 tp->t_flags |= TF_NEEDFIN;
1636 break;
1637
1638 case TCPS_ESTABLISHED:
1639 tp->t_state = TCPS_FIN_WAIT_1;
1640 break;
1641
1642 case TCPS_CLOSE_WAIT:
1643 tp->t_state = TCPS_LAST_ACK;
1644 break;
1645 }
1646 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
1647 soisdisconnected(tp->t_inpcb->inp_socket);
1648 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
a48c5dd5 1649 if (tp->t_state == TCPS_FIN_WAIT_2) {
5d61ded3 1650 tcp_callout_reset(tp, tp->tt_2msl, tp->t_maxidle,
a48c5dd5
SZ
1651 tcp_timer_2msl);
1652 }
984263bc
MD
1653 }
1654 return (tp);
1655}