tcp: Reimplement TCP_FASTKEEP socket option using per-pcb keepidle
[dragonfly.git] / sys / netinet / tcp_usrreq.c
1 /*
2  * Copyright (c) 2003, 2004 Jeffrey M. Hsu.  All rights reserved.
3  * Copyright (c) 2003, 2004 The DragonFly Project.  All rights reserved.
4  *
5  * This code is derived from software contributed to The DragonFly Project
6  * by Jeffrey M. Hsu.
7  *
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.
19  *
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 /*
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"
71 #include "opt_inet.h"
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>
78 #include <sys/malloc.h>
79 #include <sys/sysctl.h>
80 #include <sys/globaldata.h>
81 #include <sys/thread.h>
82
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
91 #include <sys/thread2.h>
92 #include <sys/msgport2.h>
93 #include <sys/socketvar2.h>
94
95 #include <net/if.h>
96 #include <net/netisr.h>
97 #include <net/route.h>
98
99 #include <net/netmsg2.h>
100
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>
114 #include <netinet6/tcp6_var.h>
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>
120 #include <netinet/tcp_timer2.h>
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  */
134 extern  char *tcpstates[];      /* XXX ??? */
135
136 static int      tcp_attach (struct socket *, struct pru_attach_info *);
137 static void     tcp_connect (netmsg_t msg);
138 #ifdef INET6
139 static void     tcp6_connect (netmsg_t msg);
140 static int      tcp6_connect_oncpu(struct tcpcb *tp, int flags,
141                                 struct mbuf **mp,
142                                 struct sockaddr_in6 *sin6,
143                                 struct in6_addr *addr6);
144 #endif /* INET6 */
145 static struct tcpcb *
146                 tcp_disconnect (struct tcpcb *);
147 static struct tcpcb *
148                 tcp_usrclosed (struct tcpcb *);
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
161 static int      tcp_lport_extension = 1;
162
163 SYSCTL_INT(_net_inet_tcp, OID_AUTO, lportext, CTLFLAG_RW,
164     &tcp_lport_extension, 0, "");
165
166 /*
167  * TCP attaches to socket via pru_attach(), reserving space,
168  * and an internet control block.  This is likely occuring on
169  * cpu0 and may have to move later when we bind/connect.
170  */
171 static void
172 tcp_usr_attach(netmsg_t msg)
173 {
174         struct socket *so = msg->base.nm_so;
175         struct pru_attach_info *ai = msg->attach.nm_ai;
176         int error;
177         struct inpcb *inp;
178         struct tcpcb *tp = NULL;
179         TCPDEBUG0;
180
181         soreference(so);
182         inp = so->so_pcb;
183         TCPDEBUG1();
184         if (inp) {
185                 error = EISCONN;
186                 goto out;
187         }
188
189         error = tcp_attach(so, ai);
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);
196 out:
197         sofree(so);             /* from ref above */
198         TCPDEBUG2(PRU_ATTACH);
199         lwkt_replymsg(&msg->lmsg, error);
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  */
209 static void
210 tcp_usr_detach(netmsg_t msg)
211 {
212         struct socket *so = msg->base.nm_so;
213         int error = 0;
214         struct inpcb *inp;
215         struct tcpcb *tp;
216         TCPDEBUG0;
217
218         inp = so->so_pcb;
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.
223          *
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          */
228         if (inp) {
229                 if ((tp = intotcpcb(inp)) != NULL) {
230                         TCPDEBUG1();
231                         tp = tcp_disconnect(tp);
232                         TCPDEBUG2(PRU_DETACH);
233                 }
234         }
235         lwkt_replymsg(&msg->lmsg, error);
236 }
237
238 /*
239  * NOTE: ignore_error is non-zero for certain disconnection races
240  * which we want to silently allow, otherwise close() may return
241  * an unexpected error.
242  *
243  * NOTE: The variables (msg) and (tp) are assumed.
244  */
245 #define COMMON_START(so, inp, ignore_error)                     \
246         TCPDEBUG0;                                              \
247                                                                 \
248         inp = so->so_pcb;                                       \
249         do {                                                    \
250                  if (inp == NULL) {                             \
251                         error = ignore_error ? 0 : EINVAL;      \
252                         tp = NULL;                              \
253                         goto out;                               \
254                  }                                              \
255                  tp = intotcpcb(inp);                           \
256                  TCPDEBUG1();                                   \
257         } while(0)
258
259 #define COMMON_END1(req, noreply)                               \
260         out: do {                                               \
261                 TCPDEBUG2(req);                                 \
262                 if (!(noreply))                                 \
263                         lwkt_replymsg(&msg->lmsg, error);       \
264                 return;                                         \
265         } while(0)
266
267 #define COMMON_END(req)         COMMON_END1((req), 0)
268
269 /*
270  * Give the socket an address.
271  */
272 static void
273 tcp_usr_bind(netmsg_t msg)
274 {
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;
278         int error = 0;
279         struct inpcb *inp;
280         struct tcpcb *tp;
281         struct sockaddr_in *sinp;
282
283         COMMON_START(so, inp, 0);
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         }
295         error = in_pcbbind(inp, nam, td);
296         if (error)
297                 goto out;
298         COMMON_END(PRU_BIND);
299
300 }
301
302 #ifdef INET6
303
304 static void
305 tcp6_usr_bind(netmsg_t msg)
306 {
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;
310         int error = 0;
311         struct inpcb *inp;
312         struct tcpcb *tp;
313         struct sockaddr_in6 *sin6p;
314
315         COMMON_START(so, inp, 0);
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;
338                         error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
339                         goto out;
340                 }
341         }
342         error = in6_pcbbind(inp, nam, td);
343         if (error)
344                 goto out;
345         COMMON_END(PRU_BIND);
346 }
347 #endif /* INET6 */
348
349 #ifdef SMP
350
351 struct netmsg_inswildcard {
352         struct netmsg_base      base;
353         struct inpcb            *nm_inp;
354 };
355
356 static void
357 in_pcbinswildcardhash_handler(netmsg_t msg)
358 {
359         struct netmsg_inswildcard *nm = (struct netmsg_inswildcard *)msg;
360         int cpu = mycpuid, nextcpu;
361
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);
369 }
370
371 #endif
372
373 /*
374  * Prepare to accept connections.
375  */
376 static void
377 tcp_usr_listen(netmsg_t msg)
378 {
379         struct socket *so = msg->listen.base.nm_so;
380         struct thread *td = msg->listen.nm_td;
381         int error = 0;
382         struct inpcb *inp;
383         struct tcpcb *tp;
384 #ifdef SMP
385         struct netmsg_inswildcard nm;
386 #endif
387
388         COMMON_START(so, inp, 0);
389
390         if (tp->t_flags & TF_LISTEN)
391                 goto out;
392
393         if (inp->inp_lport == 0) {
394                 error = in_pcbbind(inp, NULL, td);
395                 if (error)
396                         goto out;
397         }
398
399         tp->t_state = TCPS_LISTEN;
400         tp->t_flags |= TF_LISTEN;
401         tp->tt_msg = NULL; /* Catch any invalid timer usage */
402
403 #ifdef SMP
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                  */
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"));
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         }
426 #endif
427         in_pcbinswildcardhash(inp);
428         COMMON_END(PRU_LISTEN);
429 }
430
431 #ifdef INET6
432
433 static void
434 tcp6_usr_listen(netmsg_t msg)
435 {
436         struct socket *so = msg->listen.base.nm_so;
437         struct thread *td = msg->listen.nm_td;
438         int error = 0;
439         struct inpcb *inp;
440         struct tcpcb *tp;
441 #ifdef SMP
442         struct netmsg_inswildcard nm;
443 #endif
444
445         COMMON_START(so, inp, 0);
446
447         if (tp->t_flags & TF_LISTEN)
448                 goto out;
449
450         if (inp->inp_lport == 0) {
451                 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY))
452                         inp->inp_vflag |= INP_IPV4;
453                 else
454                         inp->inp_vflag &= ~INP_IPV4;
455                 error = in6_pcbbind(inp, NULL, td);
456                 if (error)
457                         goto out;
458         }
459
460         tp->t_state = TCPS_LISTEN;
461         tp->t_flags |= TF_LISTEN;
462         tp->tt_msg = NULL; /* Catch any invalid timer usage */
463
464 #ifdef SMP
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                  */
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"));
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         }
487 #endif
488         in_pcbinswildcardhash(inp);
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  */
500 static void
501 tcp_usr_connect(netmsg_t msg)
502 {
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;
506         int error = 0;
507         struct inpcb *inp;
508         struct tcpcb *tp;
509         struct sockaddr_in *sinp;
510
511         COMMON_START(so, inp, 0);
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
523         if (!prison_remote_ip(td, (struct sockaddr*)sinp)) {
524                 error = EAFNOSUPPORT; /* IPv6 only jail */
525                 goto out;
526         }
527
528         tcp_connect(msg);
529         /* msg is invalid now */
530         return;
531 out:
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);
537 }
538
539 #ifdef INET6
540
541 static void
542 tcp6_usr_connect(netmsg_t msg)
543 {
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;
547         int error = 0;
548         struct inpcb *inp;
549         struct tcpcb *tp;
550         struct sockaddr_in6 *sin6p;
551
552         COMMON_START(so, inp, 0);
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
564         if (!prison_remote_ip(td, nam)) {
565                 error = EAFNOSUPPORT; /* IPv4 only jail */
566                 goto out;
567         }
568
569         if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
570                 struct sockaddr_in *sinp;
571
572                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
573                         error = EINVAL;
574                         goto out;
575                 }
576                 sinp = kmalloc(sizeof(*sinp), M_LWKTMSG, M_INTWAIT);
577                 in6_sin6_2_sin(sinp, sin6p);
578                 inp->inp_vflag |= INP_IPV4;
579                 inp->inp_vflag &= ~INP_IPV6;
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;
585         }
586         inp->inp_vflag &= ~INP_IPV4;
587         inp->inp_vflag |= INP_IPV6;
588         inp->inp_inc.inc_isipv6 = 1;
589
590         msg->connect.nm_reconnect |= NMSG_RECONNECT_FALLBACK;
591         tcp6_connect(msg);
592         /* msg is invalid now */
593         return;
594 out:
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);
600 }
601
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  */
615 static void
616 tcp_usr_disconnect(netmsg_t msg)
617 {
618         struct socket *so = msg->disconnect.base.nm_so;
619         int error = 0;
620         struct inpcb *inp;
621         struct tcpcb *tp;
622
623         COMMON_START(so, inp, 1);
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  */
633 static void
634 tcp_usr_accept(netmsg_t msg)
635 {
636         struct socket *so = msg->accept.base.nm_so;
637         struct sockaddr **nam = msg->accept.nm_nam;
638         int error = 0;
639         struct inpcb *inp;
640         struct tcpcb *tp = NULL;
641         TCPDEBUG0;
642
643         inp = so->so_pcb;
644         if (so->so_state & SS_ISDISCONNECTED) {
645                 error = ECONNABORTED;
646                 goto out;
647         }
648         if (inp == 0) {
649                 error = EINVAL;
650                 goto out;
651         }
652
653         tp = intotcpcb(inp);
654         TCPDEBUG1();
655         in_setpeeraddr(so, nam);
656         COMMON_END(PRU_ACCEPT);
657 }
658
659 #ifdef INET6
660 static void
661 tcp6_usr_accept(netmsg_t msg)
662 {
663         struct socket *so = msg->accept.base.nm_so;
664         struct sockaddr **nam = msg->accept.nm_nam;
665         int error = 0;
666         struct inpcb *inp;
667         struct tcpcb *tp = NULL;
668         TCPDEBUG0;
669
670         inp = so->so_pcb;
671
672         if (so->so_state & SS_ISDISCONNECTED) {
673                 error = ECONNABORTED;
674                 goto out;
675         }
676         if (inp == 0) {
677                 error = EINVAL;
678                 goto out;
679         }
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  */
689 static void
690 tcp_usr_shutdown(netmsg_t msg)
691 {
692         struct socket *so = msg->shutdown.base.nm_so;
693         int error = 0;
694         struct inpcb *inp;
695         struct tcpcb *tp;
696
697         COMMON_START(so, inp, 0);
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  */
708 static void
709 tcp_usr_rcvd(netmsg_t msg)
710 {
711         struct socket *so = msg->rcvd.base.nm_so;
712         int error = 0;
713         struct inpcb *inp;
714         struct tcpcb *tp;
715
716         COMMON_START(so, inp, 0);
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  */
728 static void
729 tcp_usr_send(netmsg_t msg)
730 {
731         struct socket *so = msg->send.base.nm_so;
732         int flags = msg->send.nm_flags;
733         struct mbuf *m = msg->send.nm_m;
734         int error = 0;
735         struct inpcb *inp;
736         struct tcpcb *tp;
737         TCPDEBUG0;
738
739         KKASSERT(msg->send.nm_control == NULL);
740         KKASSERT(msg->send.nm_addr == NULL);
741         KKASSERT((flags & PRUS_FREEADDR) == 0);
742
743         inp = so->so_pcb;
744
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
749                  * network interrupt in the non-critical section of sosend().
750                  */
751                 m_freem(m);
752                 error = ECONNRESET;     /* XXX EPIPE? */
753                 tp = NULL;
754                 TCPDEBUG1();
755                 goto out;
756         }
757         tp = intotcpcb(inp);
758         TCPDEBUG1();
759
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
767         /*
768          * Don't let too much OOB data build up
769          */
770         if (flags & PRUS_OOB) {
771                 if (ssb_space(&so->so_snd) < -512) {
772                         m_freem(m);
773                         error = ENOBUFS;
774                         goto out;
775                 }
776         }
777 #endif
778
779         /*
780          * Pump the data into the socket.
781          */
782         if (m)
783                 ssb_appendstream(&so->so_snd, m);
784         if (flags & PRUS_OOB) {
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                  */
793                 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
794                 tp->t_flags |= TF_FORCE;
795                 error = tcp_output(tp);
796                 tp->t_flags &= ~TF_FORCE;
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                 }
813         }
814         COMMON_END1((flags & PRUS_OOB) ? PRU_SENDOOB :
815                    ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND),
816                    (flags & PRUS_NOREPLY));
817 }
818
819 /*
820  * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort()
821  *       will sofree() it when we return.
822  */
823 static void
824 tcp_usr_abort(netmsg_t msg)
825 {
826         struct socket *so = msg->abort.base.nm_so;
827         int error = 0;
828         struct inpcb *inp;
829         struct tcpcb *tp;
830
831         COMMON_START(so, inp, 1);
832         tp = tcp_drop(tp, ECONNABORTED);
833         COMMON_END(PRU_ABORT);
834 }
835
836 /*
837  * Receive out-of-band data.
838  */
839 static void
840 tcp_usr_rcvoob(netmsg_t msg)
841 {
842         struct socket *so = msg->rcvoob.base.nm_so;
843         struct mbuf *m = msg->rcvoob.nm_m;
844         int flags = msg->rcvoob.nm_flags;
845         int error = 0;
846         struct inpcb *inp;
847         struct tcpcb *tp;
848
849         COMMON_START(so, inp, 0);
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
868 static void
869 tcp_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
870 {
871         in_savefaddr(so, faddr);
872 }
873
874 #ifdef INET6
875 static void
876 tcp6_usr_savefaddr(struct socket *so, const struct sockaddr *faddr)
877 {
878         in6_mapped_savefaddr(so, faddr);
879 }
880 #endif
881
882 /* xxx - should be const */
883 struct pr_usrreqs tcp_usrreqs = {
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,
889         .pru_connect2 = pr_generic_notsupp,
890         .pru_control = in_control_dispatch,
891         .pru_detach = tcp_usr_detach,
892         .pru_disconnect = tcp_usr_disconnect,
893         .pru_listen = tcp_usr_listen,
894         .pru_peeraddr = in_setpeeraddr_dispatch,
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,
900         .pru_sockaddr = in_setsockaddr_dispatch,
901         .pru_sosend = sosendtcp,
902         .pru_soreceive = soreceive,
903         .pru_savefaddr = tcp_usr_savefaddr
904 };
905
906 #ifdef INET6
907 struct pr_usrreqs tcp6_usrreqs = {
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,
913         .pru_connect2 = pr_generic_notsupp,
914         .pru_control = in6_control_dispatch,
915         .pru_detach = tcp_usr_detach,
916         .pru_disconnect = tcp_usr_disconnect,
917         .pru_listen = tcp6_usr_listen,
918         .pru_peeraddr = in6_mapped_peeraddr_dispatch,
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,
924         .pru_sockaddr = in6_mapped_sockaddr_dispatch,
925         .pru_sosend = sosendtcp,
926         .pru_soreceive = soreceive,
927         .pru_savefaddr = tcp6_usr_savefaddr
928 };
929 #endif /* INET6 */
930
931 static int
932 tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m,
933                   struct sockaddr_in *sin, struct sockaddr_in *if_sin)
934 {
935         struct inpcb *inp = tp->t_inpcb, *oinp;
936         struct socket *so = inp->inp_socket;
937         struct route *ro = &inp->inp_route;
938
939         oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid],
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);
944         if (oinp != NULL) {
945                 m_freem(m);
946                 return (EADDRINUSE);
947         }
948         if (inp->inp_laddr.s_addr == INADDR_ANY)
949                 inp->inp_laddr = if_sin->sin_addr;
950         inp->inp_faddr = sin->sin_addr;
951         inp->inp_fport = sin->sin_port;
952         inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid];
953         in_pcbinsconnhash(inp);
954
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
972         /*
973          * Now that no more errors can occur, change the protocol processing
974          * port to the current thread (which is the correct thread).
975          *
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);
980
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;
988         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
989                (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat
990         ) {
991                 tp->request_r_scale++;
992         }
993
994         soisconnecting(so);
995         tcpstat.tcps_connattempt++;
996         tp->t_state = TCPS_SYN_SENT;
997         tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
998         tp->iss = tcp_new_isn(tp);
999         tcp_sendseqinit(tp);
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         }
1006
1007         /*
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));
1016 }
1017
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
1022  * a local host address (interface).
1023  * Initialize connection parameters and enter SYN-SENT state.
1024  */
1025 static void
1026 tcp_connect(netmsg_t msg)
1027 {
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;
1031         struct sockaddr_in *sin = (struct sockaddr_in *)nam;
1032         struct sockaddr_in *if_sin;
1033         struct inpcb *inp;
1034         struct tcpcb *tp;
1035         int error, calc_laddr = 1;
1036 #ifdef SMP
1037         lwkt_port_t port;
1038 #endif
1039
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
1050         /*
1051          * Bind if we have to
1052          */
1053         if (inp->inp_lport == 0) {
1054                 if (tcp_lport_extension) {
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;
1065
1066                         calc_laddr = 0;
1067                 } else {
1068                         error = in_pcbbind(inp, NULL, td);
1069                         if (error)
1070                                 goto out;
1071                 }
1072         }
1073
1074         if (calc_laddr) {
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);
1082                 if (error)
1083                         goto out;
1084         }
1085         KKASSERT(inp->inp_socket == so);
1086
1087 #ifdef SMP
1088         port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port,
1089                             (inp->inp_laddr.s_addr ?
1090                              inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr),
1091                             inp->inp_lport);
1092
1093         if (port != &curthread->td_msgport) {
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
1099                  * inpcb's owner CPU, so free it here.
1100                  */
1101                 if (ro->ro_rt != NULL)
1102                         RTFREE(ro->ro_rt);
1103                 bzero(ro, sizeof(*ro));
1104
1105                 /*
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.
1109                  */
1110                 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]);
1111                 sosetport(so, port);
1112                 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT;
1113                 msg->connect.base.nm_dispatch = tcp_connect;
1114
1115                 lwkt_forwardmsg(port, &msg->connect.base.lmsg);
1116                 /* msg invalid now */
1117                 return;
1118         }
1119 #else
1120         KKASSERT(so->so_port == &curthread->td_msgport);
1121 #endif
1122         error = tcp_connect_oncpu(tp, msg->connect.nm_flags,
1123                                   msg->connect.nm_m, sin, if_sin);
1124         msg->connect.nm_m = NULL;
1125 out:
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 */
1136 }
1137
1138 #ifdef INET6
1139
1140 static void
1141 tcp6_connect(netmsg_t msg)
1142 {
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;
1148         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1149         struct in6_addr *addr6;
1150 #ifdef SMP
1151         lwkt_port_t port;
1152 #endif
1153         int error;
1154
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          */
1168         if (inp->inp_lport == 0) {
1169                 error = in6_pcbbind(inp, NULL, td);
1170                 if (error)
1171                         goto out;
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          */
1179         error = in6_pcbladdr(inp, nam, &addr6, td);
1180         if (error)
1181                 goto out;
1182
1183 #ifdef SMP
1184         port = tcp6_addrport(); /* XXX hack for now, always cpu0 */
1185
1186         if (port != &curthread->td_msgport) {
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
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;
1206         }
1207 #endif
1208         error = tcp6_connect_oncpu(tp, msg->connect.nm_flags,
1209                                    &msg->connect.nm_m, sin6, addr6);
1210         /* nm_m may still be intact */
1211 out:
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         }
1227 }
1228
1229 static int
1230 tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf **mp,
1231                    struct sockaddr_in6 *sin6, struct in6_addr *addr6)
1232 {
1233         struct mbuf *m = *mp;
1234         struct inpcb *inp = tp->t_inpcb;
1235         struct socket *so = inp->inp_socket;
1236         struct inpcb *oinp;
1237
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          */
1243         oinp = in6_pcblookup_hash(inp->inp_cpcbinfo,
1244                                   &sin6->sin6_addr, sin6->sin6_port,
1245                                   (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ?
1246                                       addr6 : &inp->in6p_laddr),
1247                                   inp->inp_lport,  0, NULL);
1248         if (oinp)
1249                 return (EADDRINUSE);
1250
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;
1255         if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0)
1256                 inp->in6p_flowinfo = sin6->sin6_flowinfo;
1257         in_pcbinsconnhash(inp);
1258
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          */
1266         tcp_create_timermsg(tp, &curthread->td_msgport);
1267
1268         /* Compute window scaling to request.  */
1269         if (tp->request_r_scale < TCP_MIN_WINSHIFT)
1270                 tp->request_r_scale = TCP_MIN_WINSHIFT;
1271         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1272             (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) {
1273                 tp->request_r_scale++;
1274         }
1275
1276         soisconnecting(so);
1277         tcpstat.tcps_connattempt++;
1278         tp->t_state = TCPS_SYN_SENT;
1279         tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep);
1280         tp->iss = tcp_new_isn(tp);
1281         tcp_sendseqinit(tp);
1282         if (m) {
1283                 ssb_appendstream(&so->so_snd, m);
1284                 *mp = NULL;
1285                 if (flags & PRUS_OOB)
1286                         tp->snd_up = tp->snd_una + so->so_snd.ssb_cc;
1287         }
1288
1289         /*
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));
1298 }
1299
1300 #endif /* INET6 */
1301
1302 /*
1303  * The new sockopt interface makes it possible for us to block in the
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.)
1308  */
1309 void
1310 tcp_ctloutput(netmsg_t msg)
1311 {
1312         struct socket *so = msg->base.nm_so;
1313         struct sockopt *sopt = msg->ctloutput.nm_sopt;
1314         int     error, opt, optval, opthz;
1315         struct  inpcb *inp;
1316         struct  tcpcb *tp;
1317
1318         error = 0;
1319         inp = so->so_pcb;
1320         if (inp == NULL) {
1321                 error = ECONNRESET;
1322                 goto done;
1323         }
1324
1325         if (sopt->sopt_level != IPPROTO_TCP) {
1326 #ifdef INET6
1327                 if (INP_CHECK_SOCKAF(so, AF_INET6))
1328                         ip6_ctloutput_dispatch(msg);
1329                 else
1330 #endif /* INET6 */
1331                 ip_ctloutput(msg);
1332                 /* msg invalid now */
1333                 return;
1334         }
1335         tp = intotcpcb(inp);
1336
1337         switch (sopt->sopt_dir) {
1338         case SOPT_SET:
1339                 error = soopt_to_kbuf(sopt, &optval, sizeof optval,
1340                                       sizeof optval);
1341                 if (error)
1342                         break;
1343                 switch (sopt->sopt_name) {
1344                 case TCP_FASTKEEP:
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);
1350                         break;
1351 #ifdef TCP_SIGNATURE
1352                 case TCP_SIGNATURE_ENABLE:
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                         }
1367                         break;
1368 #endif /* TCP_SIGNATURE */
1369                 case TCP_NODELAY:
1370                 case TCP_NOOPT:
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:
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:
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                                 }
1412                                 tp->t_maxseg = optval;
1413                         } else {
1414                                 error = EINVAL;
1415                         }
1416                         break;
1417
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
1426                 case TCP_KEEPIDLE:
1427                         opthz = ((int64_t)optval * hz) / 1000;
1428                         if (opthz >= 1) {
1429                                 tp->t_keepidle = opthz;
1430                                 tcp_timer_keep_activity(tp, 0);
1431                         } else {
1432                                 error = EINVAL;
1433                         }
1434                         break;
1435
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
1455                 default:
1456                         error = ENOPROTOOPT;
1457                         break;
1458                 }
1459                 break;
1460
1461         case SOPT_GET:
1462                 switch (sopt->sopt_name) {
1463 #ifdef TCP_SIGNATURE
1464                 case TCP_SIGNATURE_ENABLE:
1465                         optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1466                         break;
1467 #endif /* TCP_SIGNATURE */
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;
1480                 case TCP_KEEPINIT:
1481                         optval = ((int64_t)tp->t_keepinit * 1000) / hz;
1482                         break;
1483                 case TCP_KEEPIDLE:
1484                         optval = ((int64_t)tp->t_keepidle * 1000) / hz;
1485                         break;
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;
1492                 default:
1493                         error = ENOPROTOOPT;
1494                         break;
1495                 }
1496                 if (error == 0)
1497                         soopt_from_kbuf(sopt, &optval, sizeof optval);
1498                 break;
1499         }
1500 done:
1501         lwkt_replymsg(&msg->lmsg, error);
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).
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.
1511  */
1512 u_long  tcp_sendspace = 57344;  /* largest multiple of PAGE_SIZE < 64k */
1513 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1514     &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1515 u_long  tcp_recvspace = 57344;  /* largest multiple of PAGE_SIZE < 64k */
1516 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1517     &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1518
1519 /*
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.
1523  */
1524 static int
1525 tcp_attach(struct socket *so, struct pru_attach_info *ai)
1526 {
1527         struct tcpcb *tp;
1528         struct inpcb *inp;
1529         int error;
1530         int cpu;
1531 #ifdef INET6
1532         int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
1533 #endif
1534
1535         if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) {
1536                 lwkt_gettoken(&so->so_rcv.ssb_token);
1537                 error = soreserve(so, tcp_sendspace, tcp_recvspace,
1538                                   ai->sb_rlimit);
1539                 lwkt_reltoken(&so->so_rcv.ssb_token);
1540                 if (error)
1541                         return (error);
1542         }
1543         atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE);
1544         atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE);
1545         cpu = mycpu->gd_cpuid;
1546
1547         /*
1548          * Set the default port for protocol processing. This will likely
1549          * change when we connect.
1550          */
1551         error = in_pcballoc(so, &tcbinfo[cpu]);
1552         if (error)
1553                 return (error);
1554         inp = so->so_pcb;
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);
1564         if (tp == NULL) {
1565                 /*
1566                  * Make sure the socket is destroyed by the pcbdetach.
1567                  */
1568                 soreference(so);
1569 #ifdef INET6
1570                 if (isipv6)
1571                         in6_pcbdetach(inp);
1572                 else
1573 #endif
1574                 in_pcbdetach(inp);
1575                 sofree(so);     /* from ref above */
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  */
1590 static struct tcpcb *
1591 tcp_disconnect(struct tcpcb *tp)
1592 {
1593         struct socket *so = tp->t_inpcb->inp_socket;
1594
1595         if (tp->t_state < TCPS_ESTABLISHED) {
1596                 tp = tcp_close(tp);
1597         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1598                 tp = tcp_drop(tp, 0);
1599         } else {
1600                 lwkt_gettoken(&so->so_rcv.ssb_token);
1601                 soisdisconnecting(so);
1602                 sbflush(&so->so_rcv.sb);
1603                 tp = tcp_usrclosed(tp);
1604                 if (tp)
1605                         tcp_output(tp);
1606                 lwkt_reltoken(&so->so_rcv.ssb_token);
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  */
1621 static struct tcpcb *
1622 tcp_usrclosed(struct tcpcb *tp)
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. */
1649                 if (tp->t_state == TCPS_FIN_WAIT_2) {
1650                         tcp_callout_reset(tp, tp->tt_2msl, tp->t_maxidle,
1651                             tcp_timer_2msl);
1652                 }
1653         }
1654         return (tp);
1655 }