1/*-
2 * Copyright (c) 1982, 1986, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94
| 1/*-
2 * Copyright (c) 1982, 1986, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94
|
30 * $FreeBSD: head/sys/netinet/tcp_usrreq.c 153427 2005-12-14 22:27:48Z mux $
| 30 * $FreeBSD: head/sys/netinet/tcp_usrreq.c 157366 2006-04-01 15:15:05Z rwatson $
|
31 */
32
33#include "opt_inet.h"
34#include "opt_inet6.h"
35#include "opt_tcpdebug.h"
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/malloc.h>
40#include <sys/kernel.h>
41#include <sys/sysctl.h>
42#include <sys/mbuf.h>
43#ifdef INET6
44#include <sys/domain.h>
45#endif /* INET6 */
46#include <sys/socket.h>
47#include <sys/socketvar.h>
48#include <sys/protosw.h>
49#include <sys/proc.h>
50#include <sys/jail.h>
51
52#include <net/if.h>
53#include <net/route.h>
54
55#include <netinet/in.h>
56#include <netinet/in_systm.h>
57#ifdef INET6
58#include <netinet/ip6.h>
59#endif
60#include <netinet/in_pcb.h>
61#ifdef INET6
62#include <netinet6/in6_pcb.h>
63#endif
64#include <netinet/in_var.h>
65#include <netinet/ip_var.h>
66#ifdef INET6
67#include <netinet6/ip6_var.h>
68#include <netinet6/scope6_var.h>
69#endif
70#include <netinet/tcp.h>
71#include <netinet/tcp_fsm.h>
72#include <netinet/tcp_seq.h>
73#include <netinet/tcp_timer.h>
74#include <netinet/tcp_var.h>
75#include <netinet/tcpip.h>
76#ifdef TCPDEBUG
77#include <netinet/tcp_debug.h>
78#endif
79
80/*
81 * TCP protocol interface to socket abstraction.
82 */
83extern char *tcpstates[]; /* XXX ??? */
84
85static int tcp_attach(struct socket *);
86static int tcp_connect(struct tcpcb *, struct sockaddr *,
87 struct thread *td);
88#ifdef INET6
89static int tcp6_connect(struct tcpcb *, struct sockaddr *,
90 struct thread *td);
91#endif /* INET6 */
92static struct tcpcb *
93 tcp_disconnect(struct tcpcb *);
94static struct tcpcb *
95 tcp_usrclosed(struct tcpcb *);
96static void tcp_fill_info(struct tcpcb *, struct tcp_info *);
97
98#ifdef TCPDEBUG
99#define TCPDEBUG0 int ostate = 0
100#define TCPDEBUG1() ostate = tp ? tp->t_state : 0
101#define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
102 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
103#else
104#define TCPDEBUG0
105#define TCPDEBUG1()
106#define TCPDEBUG2(req)
107#endif
108
109/*
110 * TCP attaches to socket via pru_attach(), reserving space,
111 * and an internet control block.
112 */
113static int
114tcp_usr_attach(struct socket *so, int proto, struct thread *td)
115{
116 int error;
117 struct inpcb *inp;
118 struct tcpcb *tp = 0;
119 TCPDEBUG0;
120
121 INP_INFO_WLOCK(&tcbinfo);
122 TCPDEBUG1();
123 inp = sotoinpcb(so);
124 if (inp) {
125 error = EISCONN;
126 goto out;
127 }
128
129 error = tcp_attach(so);
130 if (error)
131 goto out;
132
133 if ((so->so_options & SO_LINGER) && so->so_linger == 0)
134 so->so_linger = TCP_LINGERTIME;
135
136 inp = sotoinpcb(so);
137 tp = intotcpcb(inp);
138out:
139 TCPDEBUG2(PRU_ATTACH);
140 INP_INFO_WUNLOCK(&tcbinfo);
141 return error;
142}
143
144/*
145 * pru_detach() detaches the TCP protocol from the socket.
146 * If the protocol state is non-embryonic, then can't
147 * do this directly: have to initiate a pru_disconnect(),
148 * which may finish later; embryonic TCB's can just
149 * be discarded here.
150 */
151static int
152tcp_usr_detach(struct socket *so)
153{
154 int error = 0;
155 struct inpcb *inp;
156 struct tcpcb *tp;
157 TCPDEBUG0;
158
159 INP_INFO_WLOCK(&tcbinfo);
160 inp = sotoinpcb(so);
161 if (inp == NULL) {
162 INP_INFO_WUNLOCK(&tcbinfo);
163 return error;
164 }
165 INP_LOCK(inp);
166 tp = intotcpcb(inp);
167 TCPDEBUG1();
168 tp = tcp_disconnect(tp);
169
170 TCPDEBUG2(PRU_DETACH);
171 if (tp)
172 INP_UNLOCK(inp);
173 INP_INFO_WUNLOCK(&tcbinfo);
174 return error;
175}
176
177#define INI_NOLOCK 0
178#define INI_READ 1
179#define INI_WRITE 2
180
181#define COMMON_START() \
182 TCPDEBUG0; \
183 do { \
184 if (inirw == INI_READ) \
185 INP_INFO_RLOCK(&tcbinfo); \
186 else if (inirw == INI_WRITE) \
187 INP_INFO_WLOCK(&tcbinfo); \
188 inp = sotoinpcb(so); \
189 if (inp == 0) { \
190 if (inirw == INI_READ) \
191 INP_INFO_RUNLOCK(&tcbinfo); \
192 else if (inirw == INI_WRITE) \
193 INP_INFO_WUNLOCK(&tcbinfo); \
194 return EINVAL; \
195 } \
196 INP_LOCK(inp); \
197 if (inirw == INI_READ) \
198 INP_INFO_RUNLOCK(&tcbinfo); \
199 tp = intotcpcb(inp); \
200 TCPDEBUG1(); \
201} while(0)
202
203#define COMMON_END(req) \
204out: TCPDEBUG2(req); \
205 do { \
206 if (tp) \
207 INP_UNLOCK(inp); \
208 if (inirw == INI_WRITE) \
209 INP_INFO_WUNLOCK(&tcbinfo); \
210 return error; \
211 goto out; \
212} while(0)
213
214/*
215 * Give the socket an address.
216 */
217static int
218tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
219{
220 int error = 0;
221 struct inpcb *inp;
222 struct tcpcb *tp;
223 struct sockaddr_in *sinp;
224 const int inirw = INI_WRITE;
225
226 sinp = (struct sockaddr_in *)nam;
227 if (nam->sa_len != sizeof (*sinp))
228 return (EINVAL);
229 /*
230 * Must check for multicast addresses and disallow binding
231 * to them.
232 */
233 if (sinp->sin_family == AF_INET &&
234 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
235 return (EAFNOSUPPORT);
236
237 COMMON_START();
238 error = in_pcbbind(inp, nam, td->td_ucred);
239 if (error)
240 goto out;
241 COMMON_END(PRU_BIND);
242}
243
244#ifdef INET6
245static int
246tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
247{
248 int error = 0;
249 struct inpcb *inp;
250 struct tcpcb *tp;
251 struct sockaddr_in6 *sin6p;
252 const int inirw = INI_WRITE;
253
254 sin6p = (struct sockaddr_in6 *)nam;
255 if (nam->sa_len != sizeof (*sin6p))
256 return (EINVAL);
257 /*
258 * Must check for multicast addresses and disallow binding
259 * to them.
260 */
261 if (sin6p->sin6_family == AF_INET6 &&
262 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
263 return (EAFNOSUPPORT);
264
265 COMMON_START();
266 inp->inp_vflag &= ~INP_IPV4;
267 inp->inp_vflag |= INP_IPV6;
268 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
269 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
270 inp->inp_vflag |= INP_IPV4;
271 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
272 struct sockaddr_in sin;
273
274 in6_sin6_2_sin(&sin, sin6p);
275 inp->inp_vflag |= INP_IPV4;
276 inp->inp_vflag &= ~INP_IPV6;
277 error = in_pcbbind(inp, (struct sockaddr *)&sin,
278 td->td_ucred);
279 goto out;
280 }
281 }
282 error = in6_pcbbind(inp, nam, td->td_ucred);
283 if (error)
284 goto out;
285 COMMON_END(PRU_BIND);
286}
287#endif /* INET6 */
288
289/*
290 * Prepare to accept connections.
291 */
292static int
293tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
294{
295 int error = 0;
296 struct inpcb *inp;
297 struct tcpcb *tp;
298 const int inirw = INI_WRITE;
299
300 COMMON_START();
301 SOCK_LOCK(so);
302 error = solisten_proto_check(so);
303 if (error == 0 && inp->inp_lport == 0)
304 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
305 if (error == 0) {
306 tp->t_state = TCPS_LISTEN;
307 solisten_proto(so, backlog);
308 }
309 SOCK_UNLOCK(so);
310 COMMON_END(PRU_LISTEN);
311}
312
313#ifdef INET6
314static int
315tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
316{
317 int error = 0;
318 struct inpcb *inp;
319 struct tcpcb *tp;
320 const int inirw = INI_WRITE;
321
322 COMMON_START();
323 SOCK_LOCK(so);
324 error = solisten_proto_check(so);
325 if (error == 0 && inp->inp_lport == 0) {
326 inp->inp_vflag &= ~INP_IPV4;
327 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
328 inp->inp_vflag |= INP_IPV4;
329 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
330 }
331 if (error == 0) {
332 tp->t_state = TCPS_LISTEN;
333 solisten_proto(so, backlog);
334 }
335 SOCK_UNLOCK(so);
336 COMMON_END(PRU_LISTEN);
337}
338#endif /* INET6 */
339
340/*
341 * Initiate connection to peer.
342 * Create a template for use in transmissions on this connection.
343 * Enter SYN_SENT state, and mark socket as connecting.
344 * Start keep-alive timer, and seed output sequence space.
345 * Send initial segment on connection.
346 */
347static int
348tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
349{
350 int error = 0;
351 struct inpcb *inp;
352 struct tcpcb *tp;
353 struct sockaddr_in *sinp;
354 const int inirw = INI_WRITE;
355
356 sinp = (struct sockaddr_in *)nam;
357 if (nam->sa_len != sizeof (*sinp))
358 return (EINVAL);
359 /*
360 * Must disallow TCP ``connections'' to multicast addresses.
361 */
362 if (sinp->sin_family == AF_INET
363 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
364 return (EAFNOSUPPORT);
365 if (jailed(td->td_ucred))
366 prison_remote_ip(td->td_ucred, 0, &sinp->sin_addr.s_addr);
367
368 COMMON_START();
369 if ((error = tcp_connect(tp, nam, td)) != 0)
370 goto out;
371 error = tcp_output(tp);
372 COMMON_END(PRU_CONNECT);
373}
374
375#ifdef INET6
376static int
377tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
378{
379 int error = 0;
380 struct inpcb *inp;
381 struct tcpcb *tp;
382 struct sockaddr_in6 *sin6p;
383 const int inirw = INI_WRITE;
384
385 sin6p = (struct sockaddr_in6 *)nam;
386 if (nam->sa_len != sizeof (*sin6p))
387 return (EINVAL);
388 /*
389 * Must disallow TCP ``connections'' to multicast addresses.
390 */
391 if (sin6p->sin6_family == AF_INET6
392 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
393 return (EAFNOSUPPORT);
394
395 COMMON_START();
396 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
397 struct sockaddr_in sin;
398
399 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
400 error = EINVAL;
401 goto out;
402 }
403
404 in6_sin6_2_sin(&sin, sin6p);
405 inp->inp_vflag |= INP_IPV4;
406 inp->inp_vflag &= ~INP_IPV6;
407 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
408 goto out;
409 error = tcp_output(tp);
410 goto out;
411 }
412 inp->inp_vflag &= ~INP_IPV4;
413 inp->inp_vflag |= INP_IPV6;
414 inp->inp_inc.inc_isipv6 = 1;
415 if ((error = tcp6_connect(tp, nam, td)) != 0)
416 goto out;
417 error = tcp_output(tp);
418 COMMON_END(PRU_CONNECT);
419}
420#endif /* INET6 */
421
422/*
423 * Initiate disconnect from peer.
424 * If connection never passed embryonic stage, just drop;
425 * else if don't need to let data drain, then can just drop anyways,
426 * else have to begin TCP shutdown process: mark socket disconnecting,
427 * drain unread data, state switch to reflect user close, and
428 * send segment (e.g. FIN) to peer. Socket will be really disconnected
429 * when peer sends FIN and acks ours.
430 *
431 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
432 */
433static int
434tcp_usr_disconnect(struct socket *so)
435{
436 int error = 0;
437 struct inpcb *inp;
438 struct tcpcb *tp;
439 const int inirw = INI_WRITE;
440
441 COMMON_START();
442 tp = tcp_disconnect(tp);
443 COMMON_END(PRU_DISCONNECT);
444}
445
446/*
447 * Accept a connection. Essentially all the work is
448 * done at higher levels; just return the address
449 * of the peer, storing through addr.
450 */
451static int
452tcp_usr_accept(struct socket *so, struct sockaddr **nam)
453{
454 int error = 0;
455 struct inpcb *inp = NULL;
456 struct tcpcb *tp = NULL;
457 struct in_addr addr;
458 in_port_t port = 0;
459 TCPDEBUG0;
460
461 if (so->so_state & SS_ISDISCONNECTED) {
462 error = ECONNABORTED;
463 goto out;
464 }
465
466 INP_INFO_RLOCK(&tcbinfo);
467 inp = sotoinpcb(so);
468 if (!inp) {
469 INP_INFO_RUNLOCK(&tcbinfo);
470 return (EINVAL);
471 }
472 INP_LOCK(inp);
473 INP_INFO_RUNLOCK(&tcbinfo);
474 tp = intotcpcb(inp);
475 TCPDEBUG1();
476
477 /*
478 * We inline in_setpeeraddr and COMMON_END here, so that we can
479 * copy the data of interest and defer the malloc until after we
480 * release the lock.
481 */
482 port = inp->inp_fport;
483 addr = inp->inp_faddr;
484
485out: TCPDEBUG2(PRU_ACCEPT);
486 if (tp)
487 INP_UNLOCK(inp);
488 if (error == 0)
489 *nam = in_sockaddr(port, &addr);
490 return error;
491}
492
493#ifdef INET6
494static int
495tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
496{
497 struct inpcb *inp = NULL;
498 int error = 0;
499 struct tcpcb *tp = NULL;
500 struct in_addr addr;
501 struct in6_addr addr6;
502 in_port_t port = 0;
503 int v4 = 0;
504 TCPDEBUG0;
505
506 if (so->so_state & SS_ISDISCONNECTED) {
507 error = ECONNABORTED;
508 goto out;
509 }
510
511 INP_INFO_RLOCK(&tcbinfo);
512 inp = sotoinpcb(so);
513 if (inp == 0) {
514 INP_INFO_RUNLOCK(&tcbinfo);
515 return (EINVAL);
516 }
517 INP_LOCK(inp);
518 INP_INFO_RUNLOCK(&tcbinfo);
519 tp = intotcpcb(inp);
520 TCPDEBUG1();
521 /*
522 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
523 * copy the data of interest and defer the malloc until after we
524 * release the lock.
525 */
526 if (inp->inp_vflag & INP_IPV4) {
527 v4 = 1;
528 port = inp->inp_fport;
529 addr = inp->inp_faddr;
530 } else {
531 port = inp->inp_fport;
532 addr6 = inp->in6p_faddr;
533 }
534
535out: TCPDEBUG2(PRU_ACCEPT);
536 if (tp)
537 INP_UNLOCK(inp);
538 if (error == 0) {
539 if (v4)
540 *nam = in6_v4mapsin6_sockaddr(port, &addr);
541 else
542 *nam = in6_sockaddr(port, &addr6);
543 }
544 return error;
545}
546#endif /* INET6 */
547
548/*
549 * This is the wrapper function for in_setsockaddr. We just pass down
550 * the pcbinfo for in_setsockaddr to lock. We don't want to do the locking
551 * here because in_setsockaddr will call malloc and can block.
552 */
553static int
554tcp_sockaddr(struct socket *so, struct sockaddr **nam)
555{
556 return (in_setsockaddr(so, nam, &tcbinfo));
557}
558
559/*
560 * This is the wrapper function for in_setpeeraddr. We just pass down
561 * the pcbinfo for in_setpeeraddr to lock.
562 */
563static int
564tcp_peeraddr(struct socket *so, struct sockaddr **nam)
565{
566 return (in_setpeeraddr(so, nam, &tcbinfo));
567}
568
569/*
570 * Mark the connection as being incapable of further output.
571 */
572static int
573tcp_usr_shutdown(struct socket *so)
574{
575 int error = 0;
576 struct inpcb *inp;
577 struct tcpcb *tp;
578 const int inirw = INI_WRITE;
579
580 COMMON_START();
581 socantsendmore(so);
582 tp = tcp_usrclosed(tp);
583 if (tp)
584 error = tcp_output(tp);
585 COMMON_END(PRU_SHUTDOWN);
586}
587
588/*
589 * After a receive, possibly send window update to peer.
590 */
591static int
592tcp_usr_rcvd(struct socket *so, int flags)
593{
594 int error = 0;
595 struct inpcb *inp;
596 struct tcpcb *tp;
597 const int inirw = INI_READ;
598
599 COMMON_START();
600 tcp_output(tp);
601 COMMON_END(PRU_RCVD);
602}
603
604/*
605 * Do a send by putting data in output queue and updating urgent
606 * marker if URG set. Possibly send more data. Unlike the other
607 * pru_*() routines, the mbuf chains are our responsibility. We
608 * must either enqueue them or free them. The other pru_* routines
609 * generally are caller-frees.
610 */
611static int
612tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
613 struct sockaddr *nam, struct mbuf *control, struct thread *td)
614{
615 int error = 0;
616 struct inpcb *inp;
617 struct tcpcb *tp;
618 int unlocked = 0;
619#ifdef INET6
620 int isipv6;
621#endif
622 TCPDEBUG0;
623
624 /*
625 * Need write lock here because this function might call
626 * tcp_connect or tcp_usrclosed.
627 * We really want to have to this function upgrade from read lock
628 * to write lock. XXX
629 */
630 INP_INFO_WLOCK(&tcbinfo);
631 inp = sotoinpcb(so);
632 if (inp == NULL) {
633 /*
634 * OOPS! we lost a race, the TCP session got reset after
635 * we checked SBS_CANTSENDMORE, eg: while doing uiomove or a
636 * network interrupt in the non-splnet() section of sosend().
637 */
638 if (m)
639 m_freem(m);
640 if (control)
641 m_freem(control);
642 error = ECONNRESET; /* XXX EPIPE? */
643 tp = NULL;
644 TCPDEBUG1();
645 goto out;
646 }
647 INP_LOCK(inp);
648#ifdef INET6
649 isipv6 = nam && nam->sa_family == AF_INET6;
650#endif /* INET6 */
651 tp = intotcpcb(inp);
652 TCPDEBUG1();
653 if (control) {
654 /* TCP doesn't do control messages (rights, creds, etc) */
655 if (control->m_len) {
656 m_freem(control);
657 if (m)
658 m_freem(m);
659 error = EINVAL;
660 goto out;
661 }
662 m_freem(control); /* empty control, just free it */
663 }
664 if (!(flags & PRUS_OOB)) {
665 sbappendstream(&so->so_snd, m);
666 if (nam && tp->t_state < TCPS_SYN_SENT) {
667 /*
668 * Do implied connect if not yet connected,
669 * initialize window to default value, and
670 * initialize maxseg/maxopd using peer's cached
671 * MSS.
672 */
673#ifdef INET6
674 if (isipv6)
675 error = tcp6_connect(tp, nam, td);
676 else
677#endif /* INET6 */
678 error = tcp_connect(tp, nam, td);
679 if (error)
680 goto out;
681 tp->snd_wnd = TTCP_CLIENT_SND_WND;
682 tcp_mss(tp, -1);
683 }
684
685 if (flags & PRUS_EOF) {
686 /*
687 * Close the send side of the connection after
688 * the data is sent.
689 */
690 socantsendmore(so);
691 tp = tcp_usrclosed(tp);
692 }
693 INP_INFO_WUNLOCK(&tcbinfo);
694 unlocked = 1;
695 if (tp != NULL) {
696 if (flags & PRUS_MORETOCOME)
697 tp->t_flags |= TF_MORETOCOME;
698 error = tcp_output(tp);
699 if (flags & PRUS_MORETOCOME)
700 tp->t_flags &= ~TF_MORETOCOME;
701 }
702 } else {
703 SOCKBUF_LOCK(&so->so_snd);
704 if (sbspace(&so->so_snd) < -512) {
705 SOCKBUF_UNLOCK(&so->so_snd);
706 m_freem(m);
707 error = ENOBUFS;
708 goto out;
709 }
710 /*
711 * According to RFC961 (Assigned Protocols),
712 * the urgent pointer points to the last octet
713 * of urgent data. We continue, however,
714 * to consider it to indicate the first octet
715 * of data past the urgent section.
716 * Otherwise, snd_up should be one lower.
717 */
718 sbappendstream_locked(&so->so_snd, m);
719 SOCKBUF_UNLOCK(&so->so_snd);
720 if (nam && tp->t_state < TCPS_SYN_SENT) {
721 /*
722 * Do implied connect if not yet connected,
723 * initialize window to default value, and
724 * initialize maxseg/maxopd using peer's cached
725 * MSS.
726 */
727#ifdef INET6
728 if (isipv6)
729 error = tcp6_connect(tp, nam, td);
730 else
731#endif /* INET6 */
732 error = tcp_connect(tp, nam, td);
733 if (error)
734 goto out;
735 tp->snd_wnd = TTCP_CLIENT_SND_WND;
736 tcp_mss(tp, -1);
737 }
738 INP_INFO_WUNLOCK(&tcbinfo);
739 unlocked = 1;
740 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
741 tp->t_flags |= TF_FORCEDATA;
742 error = tcp_output(tp);
743 tp->t_flags &= ~TF_FORCEDATA;
744 }
745out:
746 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
747 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
748 if (tp)
749 INP_UNLOCK(inp);
750 if (!unlocked)
751 INP_INFO_WUNLOCK(&tcbinfo);
752 return (error);
753}
754
755/*
756 * Abort the TCP.
757 */
| 31 */
32
33#include "opt_inet.h"
34#include "opt_inet6.h"
35#include "opt_tcpdebug.h"
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/malloc.h>
40#include <sys/kernel.h>
41#include <sys/sysctl.h>
42#include <sys/mbuf.h>
43#ifdef INET6
44#include <sys/domain.h>
45#endif /* INET6 */
46#include <sys/socket.h>
47#include <sys/socketvar.h>
48#include <sys/protosw.h>
49#include <sys/proc.h>
50#include <sys/jail.h>
51
52#include <net/if.h>
53#include <net/route.h>
54
55#include <netinet/in.h>
56#include <netinet/in_systm.h>
57#ifdef INET6
58#include <netinet/ip6.h>
59#endif
60#include <netinet/in_pcb.h>
61#ifdef INET6
62#include <netinet6/in6_pcb.h>
63#endif
64#include <netinet/in_var.h>
65#include <netinet/ip_var.h>
66#ifdef INET6
67#include <netinet6/ip6_var.h>
68#include <netinet6/scope6_var.h>
69#endif
70#include <netinet/tcp.h>
71#include <netinet/tcp_fsm.h>
72#include <netinet/tcp_seq.h>
73#include <netinet/tcp_timer.h>
74#include <netinet/tcp_var.h>
75#include <netinet/tcpip.h>
76#ifdef TCPDEBUG
77#include <netinet/tcp_debug.h>
78#endif
79
80/*
81 * TCP protocol interface to socket abstraction.
82 */
83extern char *tcpstates[]; /* XXX ??? */
84
85static int tcp_attach(struct socket *);
86static int tcp_connect(struct tcpcb *, struct sockaddr *,
87 struct thread *td);
88#ifdef INET6
89static int tcp6_connect(struct tcpcb *, struct sockaddr *,
90 struct thread *td);
91#endif /* INET6 */
92static struct tcpcb *
93 tcp_disconnect(struct tcpcb *);
94static struct tcpcb *
95 tcp_usrclosed(struct tcpcb *);
96static void tcp_fill_info(struct tcpcb *, struct tcp_info *);
97
98#ifdef TCPDEBUG
99#define TCPDEBUG0 int ostate = 0
100#define TCPDEBUG1() ostate = tp ? tp->t_state : 0
101#define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
102 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
103#else
104#define TCPDEBUG0
105#define TCPDEBUG1()
106#define TCPDEBUG2(req)
107#endif
108
109/*
110 * TCP attaches to socket via pru_attach(), reserving space,
111 * and an internet control block.
112 */
113static int
114tcp_usr_attach(struct socket *so, int proto, struct thread *td)
115{
116 int error;
117 struct inpcb *inp;
118 struct tcpcb *tp = 0;
119 TCPDEBUG0;
120
121 INP_INFO_WLOCK(&tcbinfo);
122 TCPDEBUG1();
123 inp = sotoinpcb(so);
124 if (inp) {
125 error = EISCONN;
126 goto out;
127 }
128
129 error = tcp_attach(so);
130 if (error)
131 goto out;
132
133 if ((so->so_options & SO_LINGER) && so->so_linger == 0)
134 so->so_linger = TCP_LINGERTIME;
135
136 inp = sotoinpcb(so);
137 tp = intotcpcb(inp);
138out:
139 TCPDEBUG2(PRU_ATTACH);
140 INP_INFO_WUNLOCK(&tcbinfo);
141 return error;
142}
143
144/*
145 * pru_detach() detaches the TCP protocol from the socket.
146 * If the protocol state is non-embryonic, then can't
147 * do this directly: have to initiate a pru_disconnect(),
148 * which may finish later; embryonic TCB's can just
149 * be discarded here.
150 */
151static int
152tcp_usr_detach(struct socket *so)
153{
154 int error = 0;
155 struct inpcb *inp;
156 struct tcpcb *tp;
157 TCPDEBUG0;
158
159 INP_INFO_WLOCK(&tcbinfo);
160 inp = sotoinpcb(so);
161 if (inp == NULL) {
162 INP_INFO_WUNLOCK(&tcbinfo);
163 return error;
164 }
165 INP_LOCK(inp);
166 tp = intotcpcb(inp);
167 TCPDEBUG1();
168 tp = tcp_disconnect(tp);
169
170 TCPDEBUG2(PRU_DETACH);
171 if (tp)
172 INP_UNLOCK(inp);
173 INP_INFO_WUNLOCK(&tcbinfo);
174 return error;
175}
176
177#define INI_NOLOCK 0
178#define INI_READ 1
179#define INI_WRITE 2
180
181#define COMMON_START() \
182 TCPDEBUG0; \
183 do { \
184 if (inirw == INI_READ) \
185 INP_INFO_RLOCK(&tcbinfo); \
186 else if (inirw == INI_WRITE) \
187 INP_INFO_WLOCK(&tcbinfo); \
188 inp = sotoinpcb(so); \
189 if (inp == 0) { \
190 if (inirw == INI_READ) \
191 INP_INFO_RUNLOCK(&tcbinfo); \
192 else if (inirw == INI_WRITE) \
193 INP_INFO_WUNLOCK(&tcbinfo); \
194 return EINVAL; \
195 } \
196 INP_LOCK(inp); \
197 if (inirw == INI_READ) \
198 INP_INFO_RUNLOCK(&tcbinfo); \
199 tp = intotcpcb(inp); \
200 TCPDEBUG1(); \
201} while(0)
202
203#define COMMON_END(req) \
204out: TCPDEBUG2(req); \
205 do { \
206 if (tp) \
207 INP_UNLOCK(inp); \
208 if (inirw == INI_WRITE) \
209 INP_INFO_WUNLOCK(&tcbinfo); \
210 return error; \
211 goto out; \
212} while(0)
213
214/*
215 * Give the socket an address.
216 */
217static int
218tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
219{
220 int error = 0;
221 struct inpcb *inp;
222 struct tcpcb *tp;
223 struct sockaddr_in *sinp;
224 const int inirw = INI_WRITE;
225
226 sinp = (struct sockaddr_in *)nam;
227 if (nam->sa_len != sizeof (*sinp))
228 return (EINVAL);
229 /*
230 * Must check for multicast addresses and disallow binding
231 * to them.
232 */
233 if (sinp->sin_family == AF_INET &&
234 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
235 return (EAFNOSUPPORT);
236
237 COMMON_START();
238 error = in_pcbbind(inp, nam, td->td_ucred);
239 if (error)
240 goto out;
241 COMMON_END(PRU_BIND);
242}
243
244#ifdef INET6
245static int
246tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
247{
248 int error = 0;
249 struct inpcb *inp;
250 struct tcpcb *tp;
251 struct sockaddr_in6 *sin6p;
252 const int inirw = INI_WRITE;
253
254 sin6p = (struct sockaddr_in6 *)nam;
255 if (nam->sa_len != sizeof (*sin6p))
256 return (EINVAL);
257 /*
258 * Must check for multicast addresses and disallow binding
259 * to them.
260 */
261 if (sin6p->sin6_family == AF_INET6 &&
262 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
263 return (EAFNOSUPPORT);
264
265 COMMON_START();
266 inp->inp_vflag &= ~INP_IPV4;
267 inp->inp_vflag |= INP_IPV6;
268 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
269 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
270 inp->inp_vflag |= INP_IPV4;
271 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
272 struct sockaddr_in sin;
273
274 in6_sin6_2_sin(&sin, sin6p);
275 inp->inp_vflag |= INP_IPV4;
276 inp->inp_vflag &= ~INP_IPV6;
277 error = in_pcbbind(inp, (struct sockaddr *)&sin,
278 td->td_ucred);
279 goto out;
280 }
281 }
282 error = in6_pcbbind(inp, nam, td->td_ucred);
283 if (error)
284 goto out;
285 COMMON_END(PRU_BIND);
286}
287#endif /* INET6 */
288
289/*
290 * Prepare to accept connections.
291 */
292static int
293tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
294{
295 int error = 0;
296 struct inpcb *inp;
297 struct tcpcb *tp;
298 const int inirw = INI_WRITE;
299
300 COMMON_START();
301 SOCK_LOCK(so);
302 error = solisten_proto_check(so);
303 if (error == 0 && inp->inp_lport == 0)
304 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
305 if (error == 0) {
306 tp->t_state = TCPS_LISTEN;
307 solisten_proto(so, backlog);
308 }
309 SOCK_UNLOCK(so);
310 COMMON_END(PRU_LISTEN);
311}
312
313#ifdef INET6
314static int
315tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
316{
317 int error = 0;
318 struct inpcb *inp;
319 struct tcpcb *tp;
320 const int inirw = INI_WRITE;
321
322 COMMON_START();
323 SOCK_LOCK(so);
324 error = solisten_proto_check(so);
325 if (error == 0 && inp->inp_lport == 0) {
326 inp->inp_vflag &= ~INP_IPV4;
327 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
328 inp->inp_vflag |= INP_IPV4;
329 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
330 }
331 if (error == 0) {
332 tp->t_state = TCPS_LISTEN;
333 solisten_proto(so, backlog);
334 }
335 SOCK_UNLOCK(so);
336 COMMON_END(PRU_LISTEN);
337}
338#endif /* INET6 */
339
340/*
341 * Initiate connection to peer.
342 * Create a template for use in transmissions on this connection.
343 * Enter SYN_SENT state, and mark socket as connecting.
344 * Start keep-alive timer, and seed output sequence space.
345 * Send initial segment on connection.
346 */
347static int
348tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
349{
350 int error = 0;
351 struct inpcb *inp;
352 struct tcpcb *tp;
353 struct sockaddr_in *sinp;
354 const int inirw = INI_WRITE;
355
356 sinp = (struct sockaddr_in *)nam;
357 if (nam->sa_len != sizeof (*sinp))
358 return (EINVAL);
359 /*
360 * Must disallow TCP ``connections'' to multicast addresses.
361 */
362 if (sinp->sin_family == AF_INET
363 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
364 return (EAFNOSUPPORT);
365 if (jailed(td->td_ucred))
366 prison_remote_ip(td->td_ucred, 0, &sinp->sin_addr.s_addr);
367
368 COMMON_START();
369 if ((error = tcp_connect(tp, nam, td)) != 0)
370 goto out;
371 error = tcp_output(tp);
372 COMMON_END(PRU_CONNECT);
373}
374
375#ifdef INET6
376static int
377tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
378{
379 int error = 0;
380 struct inpcb *inp;
381 struct tcpcb *tp;
382 struct sockaddr_in6 *sin6p;
383 const int inirw = INI_WRITE;
384
385 sin6p = (struct sockaddr_in6 *)nam;
386 if (nam->sa_len != sizeof (*sin6p))
387 return (EINVAL);
388 /*
389 * Must disallow TCP ``connections'' to multicast addresses.
390 */
391 if (sin6p->sin6_family == AF_INET6
392 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
393 return (EAFNOSUPPORT);
394
395 COMMON_START();
396 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
397 struct sockaddr_in sin;
398
399 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
400 error = EINVAL;
401 goto out;
402 }
403
404 in6_sin6_2_sin(&sin, sin6p);
405 inp->inp_vflag |= INP_IPV4;
406 inp->inp_vflag &= ~INP_IPV6;
407 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
408 goto out;
409 error = tcp_output(tp);
410 goto out;
411 }
412 inp->inp_vflag &= ~INP_IPV4;
413 inp->inp_vflag |= INP_IPV6;
414 inp->inp_inc.inc_isipv6 = 1;
415 if ((error = tcp6_connect(tp, nam, td)) != 0)
416 goto out;
417 error = tcp_output(tp);
418 COMMON_END(PRU_CONNECT);
419}
420#endif /* INET6 */
421
422/*
423 * Initiate disconnect from peer.
424 * If connection never passed embryonic stage, just drop;
425 * else if don't need to let data drain, then can just drop anyways,
426 * else have to begin TCP shutdown process: mark socket disconnecting,
427 * drain unread data, state switch to reflect user close, and
428 * send segment (e.g. FIN) to peer. Socket will be really disconnected
429 * when peer sends FIN and acks ours.
430 *
431 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
432 */
433static int
434tcp_usr_disconnect(struct socket *so)
435{
436 int error = 0;
437 struct inpcb *inp;
438 struct tcpcb *tp;
439 const int inirw = INI_WRITE;
440
441 COMMON_START();
442 tp = tcp_disconnect(tp);
443 COMMON_END(PRU_DISCONNECT);
444}
445
446/*
447 * Accept a connection. Essentially all the work is
448 * done at higher levels; just return the address
449 * of the peer, storing through addr.
450 */
451static int
452tcp_usr_accept(struct socket *so, struct sockaddr **nam)
453{
454 int error = 0;
455 struct inpcb *inp = NULL;
456 struct tcpcb *tp = NULL;
457 struct in_addr addr;
458 in_port_t port = 0;
459 TCPDEBUG0;
460
461 if (so->so_state & SS_ISDISCONNECTED) {
462 error = ECONNABORTED;
463 goto out;
464 }
465
466 INP_INFO_RLOCK(&tcbinfo);
467 inp = sotoinpcb(so);
468 if (!inp) {
469 INP_INFO_RUNLOCK(&tcbinfo);
470 return (EINVAL);
471 }
472 INP_LOCK(inp);
473 INP_INFO_RUNLOCK(&tcbinfo);
474 tp = intotcpcb(inp);
475 TCPDEBUG1();
476
477 /*
478 * We inline in_setpeeraddr and COMMON_END here, so that we can
479 * copy the data of interest and defer the malloc until after we
480 * release the lock.
481 */
482 port = inp->inp_fport;
483 addr = inp->inp_faddr;
484
485out: TCPDEBUG2(PRU_ACCEPT);
486 if (tp)
487 INP_UNLOCK(inp);
488 if (error == 0)
489 *nam = in_sockaddr(port, &addr);
490 return error;
491}
492
493#ifdef INET6
494static int
495tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
496{
497 struct inpcb *inp = NULL;
498 int error = 0;
499 struct tcpcb *tp = NULL;
500 struct in_addr addr;
501 struct in6_addr addr6;
502 in_port_t port = 0;
503 int v4 = 0;
504 TCPDEBUG0;
505
506 if (so->so_state & SS_ISDISCONNECTED) {
507 error = ECONNABORTED;
508 goto out;
509 }
510
511 INP_INFO_RLOCK(&tcbinfo);
512 inp = sotoinpcb(so);
513 if (inp == 0) {
514 INP_INFO_RUNLOCK(&tcbinfo);
515 return (EINVAL);
516 }
517 INP_LOCK(inp);
518 INP_INFO_RUNLOCK(&tcbinfo);
519 tp = intotcpcb(inp);
520 TCPDEBUG1();
521 /*
522 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
523 * copy the data of interest and defer the malloc until after we
524 * release the lock.
525 */
526 if (inp->inp_vflag & INP_IPV4) {
527 v4 = 1;
528 port = inp->inp_fport;
529 addr = inp->inp_faddr;
530 } else {
531 port = inp->inp_fport;
532 addr6 = inp->in6p_faddr;
533 }
534
535out: TCPDEBUG2(PRU_ACCEPT);
536 if (tp)
537 INP_UNLOCK(inp);
538 if (error == 0) {
539 if (v4)
540 *nam = in6_v4mapsin6_sockaddr(port, &addr);
541 else
542 *nam = in6_sockaddr(port, &addr6);
543 }
544 return error;
545}
546#endif /* INET6 */
547
548/*
549 * This is the wrapper function for in_setsockaddr. We just pass down
550 * the pcbinfo for in_setsockaddr to lock. We don't want to do the locking
551 * here because in_setsockaddr will call malloc and can block.
552 */
553static int
554tcp_sockaddr(struct socket *so, struct sockaddr **nam)
555{
556 return (in_setsockaddr(so, nam, &tcbinfo));
557}
558
559/*
560 * This is the wrapper function for in_setpeeraddr. We just pass down
561 * the pcbinfo for in_setpeeraddr to lock.
562 */
563static int
564tcp_peeraddr(struct socket *so, struct sockaddr **nam)
565{
566 return (in_setpeeraddr(so, nam, &tcbinfo));
567}
568
569/*
570 * Mark the connection as being incapable of further output.
571 */
572static int
573tcp_usr_shutdown(struct socket *so)
574{
575 int error = 0;
576 struct inpcb *inp;
577 struct tcpcb *tp;
578 const int inirw = INI_WRITE;
579
580 COMMON_START();
581 socantsendmore(so);
582 tp = tcp_usrclosed(tp);
583 if (tp)
584 error = tcp_output(tp);
585 COMMON_END(PRU_SHUTDOWN);
586}
587
588/*
589 * After a receive, possibly send window update to peer.
590 */
591static int
592tcp_usr_rcvd(struct socket *so, int flags)
593{
594 int error = 0;
595 struct inpcb *inp;
596 struct tcpcb *tp;
597 const int inirw = INI_READ;
598
599 COMMON_START();
600 tcp_output(tp);
601 COMMON_END(PRU_RCVD);
602}
603
604/*
605 * Do a send by putting data in output queue and updating urgent
606 * marker if URG set. Possibly send more data. Unlike the other
607 * pru_*() routines, the mbuf chains are our responsibility. We
608 * must either enqueue them or free them. The other pru_* routines
609 * generally are caller-frees.
610 */
611static int
612tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
613 struct sockaddr *nam, struct mbuf *control, struct thread *td)
614{
615 int error = 0;
616 struct inpcb *inp;
617 struct tcpcb *tp;
618 int unlocked = 0;
619#ifdef INET6
620 int isipv6;
621#endif
622 TCPDEBUG0;
623
624 /*
625 * Need write lock here because this function might call
626 * tcp_connect or tcp_usrclosed.
627 * We really want to have to this function upgrade from read lock
628 * to write lock. XXX
629 */
630 INP_INFO_WLOCK(&tcbinfo);
631 inp = sotoinpcb(so);
632 if (inp == NULL) {
633 /*
634 * OOPS! we lost a race, the TCP session got reset after
635 * we checked SBS_CANTSENDMORE, eg: while doing uiomove or a
636 * network interrupt in the non-splnet() section of sosend().
637 */
638 if (m)
639 m_freem(m);
640 if (control)
641 m_freem(control);
642 error = ECONNRESET; /* XXX EPIPE? */
643 tp = NULL;
644 TCPDEBUG1();
645 goto out;
646 }
647 INP_LOCK(inp);
648#ifdef INET6
649 isipv6 = nam && nam->sa_family == AF_INET6;
650#endif /* INET6 */
651 tp = intotcpcb(inp);
652 TCPDEBUG1();
653 if (control) {
654 /* TCP doesn't do control messages (rights, creds, etc) */
655 if (control->m_len) {
656 m_freem(control);
657 if (m)
658 m_freem(m);
659 error = EINVAL;
660 goto out;
661 }
662 m_freem(control); /* empty control, just free it */
663 }
664 if (!(flags & PRUS_OOB)) {
665 sbappendstream(&so->so_snd, m);
666 if (nam && tp->t_state < TCPS_SYN_SENT) {
667 /*
668 * Do implied connect if not yet connected,
669 * initialize window to default value, and
670 * initialize maxseg/maxopd using peer's cached
671 * MSS.
672 */
673#ifdef INET6
674 if (isipv6)
675 error = tcp6_connect(tp, nam, td);
676 else
677#endif /* INET6 */
678 error = tcp_connect(tp, nam, td);
679 if (error)
680 goto out;
681 tp->snd_wnd = TTCP_CLIENT_SND_WND;
682 tcp_mss(tp, -1);
683 }
684
685 if (flags & PRUS_EOF) {
686 /*
687 * Close the send side of the connection after
688 * the data is sent.
689 */
690 socantsendmore(so);
691 tp = tcp_usrclosed(tp);
692 }
693 INP_INFO_WUNLOCK(&tcbinfo);
694 unlocked = 1;
695 if (tp != NULL) {
696 if (flags & PRUS_MORETOCOME)
697 tp->t_flags |= TF_MORETOCOME;
698 error = tcp_output(tp);
699 if (flags & PRUS_MORETOCOME)
700 tp->t_flags &= ~TF_MORETOCOME;
701 }
702 } else {
703 SOCKBUF_LOCK(&so->so_snd);
704 if (sbspace(&so->so_snd) < -512) {
705 SOCKBUF_UNLOCK(&so->so_snd);
706 m_freem(m);
707 error = ENOBUFS;
708 goto out;
709 }
710 /*
711 * According to RFC961 (Assigned Protocols),
712 * the urgent pointer points to the last octet
713 * of urgent data. We continue, however,
714 * to consider it to indicate the first octet
715 * of data past the urgent section.
716 * Otherwise, snd_up should be one lower.
717 */
718 sbappendstream_locked(&so->so_snd, m);
719 SOCKBUF_UNLOCK(&so->so_snd);
720 if (nam && tp->t_state < TCPS_SYN_SENT) {
721 /*
722 * Do implied connect if not yet connected,
723 * initialize window to default value, and
724 * initialize maxseg/maxopd using peer's cached
725 * MSS.
726 */
727#ifdef INET6
728 if (isipv6)
729 error = tcp6_connect(tp, nam, td);
730 else
731#endif /* INET6 */
732 error = tcp_connect(tp, nam, td);
733 if (error)
734 goto out;
735 tp->snd_wnd = TTCP_CLIENT_SND_WND;
736 tcp_mss(tp, -1);
737 }
738 INP_INFO_WUNLOCK(&tcbinfo);
739 unlocked = 1;
740 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
741 tp->t_flags |= TF_FORCEDATA;
742 error = tcp_output(tp);
743 tp->t_flags &= ~TF_FORCEDATA;
744 }
745out:
746 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
747 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
748 if (tp)
749 INP_UNLOCK(inp);
750 if (!unlocked)
751 INP_INFO_WUNLOCK(&tcbinfo);
752 return (error);
753}
754
755/*
756 * Abort the TCP.
757 */
|
758static int
| 758static void
|
759tcp_usr_abort(struct socket *so)
760{
| 759tcp_usr_abort(struct socket *so)
760{
|
761 int error = 0;
| |
762 struct inpcb *inp;
763 struct tcpcb *tp;
| 761 struct inpcb *inp;
762 struct tcpcb *tp;
|
764 const int inirw = INI_WRITE;
| 763 TCPDEBUG0;
|
765
| 764
|
766 COMMON_START();
| 765 INP_INFO_WLOCK(&tcbinfo);
766 inp = sotoinpcb(so);
767 if (inp == NULL)
768 return;
769 INP_LOCK(inp);
770 tp = intotcpcb(inp);
771 TCPDEBUG1();
|
767 tp = tcp_drop(tp, ECONNABORTED);
| 772 tp = tcp_drop(tp, ECONNABORTED);
|
768 COMMON_END(PRU_ABORT);
| 773 TCPDEBUG2(PRU_ABORT);
774 if (tp)
775 INP_UNLOCK(inp);
776 INP_INFO_WUNLOCK(&tcbinfo);
|
769}
770
771/*
772 * Receive out-of-band data.
773 */
774static int
775tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
776{
777 int error = 0;
778 struct inpcb *inp;
779 struct tcpcb *tp;
780 const int inirw = INI_READ;
781
782 COMMON_START();
783 if ((so->so_oobmark == 0 &&
784 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
785 so->so_options & SO_OOBINLINE ||
786 tp->t_oobflags & TCPOOB_HADDATA) {
787 error = EINVAL;
788 goto out;
789 }
790 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
791 error = EWOULDBLOCK;
792 goto out;
793 }
794 m->m_len = 1;
795 *mtod(m, caddr_t) = tp->t_iobc;
796 if ((flags & MSG_PEEK) == 0)
797 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
798 COMMON_END(PRU_RCVOOB);
799}
800
801struct pr_usrreqs tcp_usrreqs = {
802 .pru_abort = tcp_usr_abort,
803 .pru_accept = tcp_usr_accept,
804 .pru_attach = tcp_usr_attach,
805 .pru_bind = tcp_usr_bind,
806 .pru_connect = tcp_usr_connect,
807 .pru_control = in_control,
808 .pru_detach = tcp_usr_detach,
809 .pru_disconnect = tcp_usr_disconnect,
810 .pru_listen = tcp_usr_listen,
811 .pru_peeraddr = tcp_peeraddr,
812 .pru_rcvd = tcp_usr_rcvd,
813 .pru_rcvoob = tcp_usr_rcvoob,
814 .pru_send = tcp_usr_send,
815 .pru_shutdown = tcp_usr_shutdown,
816 .pru_sockaddr = tcp_sockaddr,
817 .pru_sosetlabel = in_pcbsosetlabel
818};
819
820#ifdef INET6
821struct pr_usrreqs tcp6_usrreqs = {
822 .pru_abort = tcp_usr_abort,
823 .pru_accept = tcp6_usr_accept,
824 .pru_attach = tcp_usr_attach,
825 .pru_bind = tcp6_usr_bind,
826 .pru_connect = tcp6_usr_connect,
827 .pru_control = in6_control,
828 .pru_detach = tcp_usr_detach,
829 .pru_disconnect = tcp_usr_disconnect,
830 .pru_listen = tcp6_usr_listen,
831 .pru_peeraddr = in6_mapped_peeraddr,
832 .pru_rcvd = tcp_usr_rcvd,
833 .pru_rcvoob = tcp_usr_rcvoob,
834 .pru_send = tcp_usr_send,
835 .pru_shutdown = tcp_usr_shutdown,
836 .pru_sockaddr = in6_mapped_sockaddr,
837 .pru_sosetlabel = in_pcbsosetlabel
838};
839#endif /* INET6 */
840
841/*
842 * Common subroutine to open a TCP connection to remote host specified
843 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
844 * port number if needed. Call in_pcbconnect_setup to do the routing and
845 * to choose a local host address (interface). If there is an existing
846 * incarnation of the same connection in TIME-WAIT state and if the remote
847 * host was sending CC options and if the connection duration was < MSL, then
848 * truncate the previous TIME-WAIT state and proceed.
849 * Initialize connection parameters and enter SYN-SENT state.
850 */
851static int
852tcp_connect(tp, nam, td)
853 register struct tcpcb *tp;
854 struct sockaddr *nam;
855 struct thread *td;
856{
857 struct inpcb *inp = tp->t_inpcb, *oinp;
858 struct socket *so = inp->inp_socket;
859 struct in_addr laddr;
860 u_short lport;
861 int error;
862
863 if (inp->inp_lport == 0) {
864 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
865 if (error)
866 return error;
867 }
868
869 /*
870 * Cannot simply call in_pcbconnect, because there might be an
871 * earlier incarnation of this same connection still in
872 * TIME_WAIT state, creating an ADDRINUSE error.
873 */
874 laddr = inp->inp_laddr;
875 lport = inp->inp_lport;
876 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
877 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
878 if (error && oinp == NULL)
879 return error;
880 if (oinp)
881 return EADDRINUSE;
882 inp->inp_laddr = laddr;
883 in_pcbrehash(inp);
884
885 /* Compute window scaling to request. */
886 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
887 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
888 tp->request_r_scale++;
889
890 soisconnecting(so);
891 tcpstat.tcps_connattempt++;
892 tp->t_state = TCPS_SYN_SENT;
893 callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp);
894 tp->iss = tcp_new_isn(tp);
895 tp->t_bw_rtseq = tp->iss;
896 tcp_sendseqinit(tp);
897
898 return 0;
899}
900
901#ifdef INET6
902static int
903tcp6_connect(tp, nam, td)
904 register struct tcpcb *tp;
905 struct sockaddr *nam;
906 struct thread *td;
907{
908 struct inpcb *inp = tp->t_inpcb, *oinp;
909 struct socket *so = inp->inp_socket;
910 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
911 struct in6_addr *addr6;
912 int error;
913
914 if (inp->inp_lport == 0) {
915 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
916 if (error)
917 return error;
918 }
919
920 /*
921 * Cannot simply call in_pcbconnect, because there might be an
922 * earlier incarnation of this same connection still in
923 * TIME_WAIT state, creating an ADDRINUSE error.
924 * in6_pcbladdr() also handles scope zone IDs.
925 */
926 error = in6_pcbladdr(inp, nam, &addr6);
927 if (error)
928 return error;
929 oinp = in6_pcblookup_hash(inp->inp_pcbinfo,
930 &sin6->sin6_addr, sin6->sin6_port,
931 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
932 ? addr6
933 : &inp->in6p_laddr,
934 inp->inp_lport, 0, NULL);
935 if (oinp)
936 return EADDRINUSE;
937 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
938 inp->in6p_laddr = *addr6;
939 inp->in6p_faddr = sin6->sin6_addr;
940 inp->inp_fport = sin6->sin6_port;
941 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
942 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
943 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
944 inp->in6p_flowinfo |=
945 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
946 in_pcbrehash(inp);
947
948 /* Compute window scaling to request. */
949 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
950 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
951 tp->request_r_scale++;
952
953 soisconnecting(so);
954 tcpstat.tcps_connattempt++;
955 tp->t_state = TCPS_SYN_SENT;
956 callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp);
957 tp->iss = tcp_new_isn(tp);
958 tp->t_bw_rtseq = tp->iss;
959 tcp_sendseqinit(tp);
960
961 return 0;
962}
963#endif /* INET6 */
964
965/*
966 * Export TCP internal state information via a struct tcp_info, based on the
967 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently
968 * (TCP state machine, etc). We export all information using FreeBSD-native
969 * constants -- for example, the numeric values for tcpi_state will differ
970 * from Linux.
971 */
972static void
973tcp_fill_info(tp, ti)
974 struct tcpcb *tp;
975 struct tcp_info *ti;
976{
977
978 INP_LOCK_ASSERT(tp->t_inpcb);
979 bzero(ti, sizeof(*ti));
980
981 ti->tcpi_state = tp->t_state;
982 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
983 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
984 if (tp->sack_enable)
985 ti->tcpi_options |= TCPI_OPT_SACK;
986 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
987 ti->tcpi_options |= TCPI_OPT_WSCALE;
988 ti->tcpi_snd_wscale = tp->snd_scale;
989 ti->tcpi_rcv_wscale = tp->rcv_scale;
990 }
991 ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
992 ti->tcpi_snd_cwnd = tp->snd_cwnd;
993
994 /*
995 * FreeBSD-specific extension fields for tcp_info.
996 */
997 ti->tcpi_rcv_space = tp->rcv_wnd;
998 ti->tcpi_snd_wnd = tp->snd_wnd;
999 ti->tcpi_snd_bwnd = tp->snd_bwnd;
1000}
1001
1002/*
1003 * The new sockopt interface makes it possible for us to block in the
1004 * copyin/out step (if we take a page fault). Taking a page fault at
1005 * splnet() is probably a Bad Thing. (Since sockets and pcbs both now
1006 * use TSM, there probably isn't any need for this function to run at
1007 * splnet() any more. This needs more examination.)
1008 *
1009 * XXXRW: The locking here is wrong; we may take a page fault while holding
1010 * the inpcb lock.
1011 */
1012int
1013tcp_ctloutput(so, sopt)
1014 struct socket *so;
1015 struct sockopt *sopt;
1016{
1017 int error, opt, optval;
1018 struct inpcb *inp;
1019 struct tcpcb *tp;
1020 struct tcp_info ti;
1021
1022 error = 0;
1023 INP_INFO_RLOCK(&tcbinfo);
1024 inp = sotoinpcb(so);
1025 if (inp == NULL) {
1026 INP_INFO_RUNLOCK(&tcbinfo);
1027 return (ECONNRESET);
1028 }
1029 INP_LOCK(inp);
1030 INP_INFO_RUNLOCK(&tcbinfo);
1031 if (sopt->sopt_level != IPPROTO_TCP) {
1032 INP_UNLOCK(inp);
1033#ifdef INET6
1034 if (INP_CHECK_SOCKAF(so, AF_INET6))
1035 error = ip6_ctloutput(so, sopt);
1036 else
1037#endif /* INET6 */
1038 error = ip_ctloutput(so, sopt);
1039 return (error);
1040 }
1041 tp = intotcpcb(inp);
1042
1043 switch (sopt->sopt_dir) {
1044 case SOPT_SET:
1045 switch (sopt->sopt_name) {
1046#ifdef TCP_SIGNATURE
1047 case TCP_MD5SIG:
1048 error = sooptcopyin(sopt, &optval, sizeof optval,
1049 sizeof optval);
1050 if (error)
1051 break;
1052
1053 if (optval > 0)
1054 tp->t_flags |= TF_SIGNATURE;
1055 else
1056 tp->t_flags &= ~TF_SIGNATURE;
1057 break;
1058#endif /* TCP_SIGNATURE */
1059 case TCP_NODELAY:
1060 case TCP_NOOPT:
1061 error = sooptcopyin(sopt, &optval, sizeof optval,
1062 sizeof optval);
1063 if (error)
1064 break;
1065
1066 switch (sopt->sopt_name) {
1067 case TCP_NODELAY:
1068 opt = TF_NODELAY;
1069 break;
1070 case TCP_NOOPT:
1071 opt = TF_NOOPT;
1072 break;
1073 default:
1074 opt = 0; /* dead code to fool gcc */
1075 break;
1076 }
1077
1078 if (optval)
1079 tp->t_flags |= opt;
1080 else
1081 tp->t_flags &= ~opt;
1082 break;
1083
1084 case TCP_NOPUSH:
1085 error = sooptcopyin(sopt, &optval, sizeof optval,
1086 sizeof optval);
1087 if (error)
1088 break;
1089
1090 if (optval)
1091 tp->t_flags |= TF_NOPUSH;
1092 else {
1093 tp->t_flags &= ~TF_NOPUSH;
1094 error = tcp_output(tp);
1095 }
1096 break;
1097
1098 case TCP_MAXSEG:
1099 error = sooptcopyin(sopt, &optval, sizeof optval,
1100 sizeof optval);
1101 if (error)
1102 break;
1103
1104 if (optval > 0 && optval <= tp->t_maxseg &&
1105 optval + 40 >= tcp_minmss)
1106 tp->t_maxseg = optval;
1107 else
1108 error = EINVAL;
1109 break;
1110
1111 case TCP_INFO:
1112 error = EINVAL;
1113 break;
1114
1115 default:
1116 error = ENOPROTOOPT;
1117 break;
1118 }
1119 break;
1120
1121 case SOPT_GET:
1122 switch (sopt->sopt_name) {
1123#ifdef TCP_SIGNATURE
1124 case TCP_MD5SIG:
1125 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1126 error = sooptcopyout(sopt, &optval, sizeof optval);
1127 break;
1128#endif
1129 case TCP_NODELAY:
1130 optval = tp->t_flags & TF_NODELAY;
1131 error = sooptcopyout(sopt, &optval, sizeof optval);
1132 break;
1133 case TCP_MAXSEG:
1134 optval = tp->t_maxseg;
1135 error = sooptcopyout(sopt, &optval, sizeof optval);
1136 break;
1137 case TCP_NOOPT:
1138 optval = tp->t_flags & TF_NOOPT;
1139 error = sooptcopyout(sopt, &optval, sizeof optval);
1140 break;
1141 case TCP_NOPUSH:
1142 optval = tp->t_flags & TF_NOPUSH;
1143 error = sooptcopyout(sopt, &optval, sizeof optval);
1144 break;
1145 case TCP_INFO:
1146 tcp_fill_info(tp, &ti);
1147 error = sooptcopyout(sopt, &ti, sizeof ti);
1148 break;
1149 default:
1150 error = ENOPROTOOPT;
1151 break;
1152 }
1153 break;
1154 }
1155 INP_UNLOCK(inp);
1156 return (error);
1157}
1158
1159/*
1160 * tcp_sendspace and tcp_recvspace are the default send and receive window
1161 * sizes, respectively. These are obsolescent (this information should
1162 * be set by the route).
1163 */
1164u_long tcp_sendspace = 1024*32;
1165SYSCTL_ULONG(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1166 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1167u_long tcp_recvspace = 1024*64;
1168SYSCTL_ULONG(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1169 &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1170
1171/*
1172 * Attach TCP protocol to socket, allocating
1173 * internet protocol control block, tcp control block,
1174 * bufer space, and entering LISTEN state if to accept connections.
1175 */
1176static int
1177tcp_attach(so)
1178 struct socket *so;
1179{
1180 register struct tcpcb *tp;
1181 struct inpcb *inp;
1182 int error;
1183#ifdef INET6
1184 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
1185#endif
1186
1187 INP_INFO_WLOCK_ASSERT(&tcbinfo);
1188
1189 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1190 error = soreserve(so, tcp_sendspace, tcp_recvspace);
1191 if (error)
1192 return (error);
1193 }
1194 error = in_pcballoc(so, &tcbinfo, "tcpinp");
1195 if (error)
1196 return (error);
1197 inp = sotoinpcb(so);
1198#ifdef INET6
1199 if (isipv6) {
1200 inp->inp_vflag |= INP_IPV6;
1201 inp->in6p_hops = -1; /* use kernel default */
1202 }
1203 else
1204#endif
1205 inp->inp_vflag |= INP_IPV4;
1206 tp = tcp_newtcpcb(inp);
1207 if (tp == 0) {
1208 int nofd = so->so_state & SS_NOFDREF; /* XXX */
1209
1210 so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */
1211
1212 INP_LOCK(inp);
1213#ifdef INET6
1214 if (isipv6)
1215 in6_pcbdetach(inp);
1216 else
1217#endif
1218 in_pcbdetach(inp);
1219 so->so_state |= nofd;
1220 return (ENOBUFS);
1221 }
1222 tp->t_state = TCPS_CLOSED;
1223 return (0);
1224}
1225
1226/*
1227 * Initiate (or continue) disconnect.
1228 * If embryonic state, just send reset (once).
1229 * If in ``let data drain'' option and linger null, just drop.
1230 * Otherwise (hard), mark socket disconnecting and drop
1231 * current input data; switch states based on user close, and
1232 * send segment to peer (with FIN).
1233 */
1234static struct tcpcb *
1235tcp_disconnect(tp)
1236 register struct tcpcb *tp;
1237{
1238 struct inpcb *inp = tp->t_inpcb;
1239 struct socket *so = inp->inp_socket;
1240
1241 INP_INFO_WLOCK_ASSERT(&tcbinfo);
1242 INP_LOCK_ASSERT(inp);
1243
1244 if (tp->t_state < TCPS_ESTABLISHED)
1245 tp = tcp_close(tp);
1246 else if ((so->so_options & SO_LINGER) && so->so_linger == 0)
1247 tp = tcp_drop(tp, 0);
1248 else {
1249 soisdisconnecting(so);
1250 sbflush(&so->so_rcv);
1251 tp = tcp_usrclosed(tp);
1252 if (tp)
1253 (void) tcp_output(tp);
1254 }
1255 return (tp);
1256}
1257
1258/*
1259 * User issued close, and wish to trail through shutdown states:
1260 * if never received SYN, just forget it. If got a SYN from peer,
1261 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1262 * If already got a FIN from peer, then almost done; go to LAST_ACK
1263 * state. In all other cases, have already sent FIN to peer (e.g.
1264 * after PRU_SHUTDOWN), and just have to play tedious game waiting
1265 * for peer to send FIN or not respond to keep-alives, etc.
1266 * We can let the user exit from the close as soon as the FIN is acked.
1267 */
1268static struct tcpcb *
1269tcp_usrclosed(tp)
1270 register struct tcpcb *tp;
1271{
1272
1273 INP_INFO_WLOCK_ASSERT(&tcbinfo);
1274 INP_LOCK_ASSERT(tp->t_inpcb);
1275
1276 switch (tp->t_state) {
1277
1278 case TCPS_CLOSED:
1279 case TCPS_LISTEN:
1280 tp->t_state = TCPS_CLOSED;
1281 tp = tcp_close(tp);
1282 break;
1283
1284 case TCPS_SYN_SENT:
1285 case TCPS_SYN_RECEIVED:
1286 tp->t_flags |= TF_NEEDFIN;
1287 break;
1288
1289 case TCPS_ESTABLISHED:
1290 tp->t_state = TCPS_FIN_WAIT_1;
1291 break;
1292
1293 case TCPS_CLOSE_WAIT:
1294 tp->t_state = TCPS_LAST_ACK;
1295 break;
1296 }
1297 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
1298 soisdisconnected(tp->t_inpcb->inp_socket);
1299 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
1300 if (tp->t_state == TCPS_FIN_WAIT_2)
1301 callout_reset(tp->tt_2msl, tcp_maxidle,
1302 tcp_timer_2msl, tp);
1303 }
1304 return (tp);
1305}
| 777}
778
779/*
780 * Receive out-of-band data.
781 */
782static int
783tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
784{
785 int error = 0;
786 struct inpcb *inp;
787 struct tcpcb *tp;
788 const int inirw = INI_READ;
789
790 COMMON_START();
791 if ((so->so_oobmark == 0 &&
792 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
793 so->so_options & SO_OOBINLINE ||
794 tp->t_oobflags & TCPOOB_HADDATA) {
795 error = EINVAL;
796 goto out;
797 }
798 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
799 error = EWOULDBLOCK;
800 goto out;
801 }
802 m->m_len = 1;
803 *mtod(m, caddr_t) = tp->t_iobc;
804 if ((flags & MSG_PEEK) == 0)
805 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
806 COMMON_END(PRU_RCVOOB);
807}
808
809struct pr_usrreqs tcp_usrreqs = {
810 .pru_abort = tcp_usr_abort,
811 .pru_accept = tcp_usr_accept,
812 .pru_attach = tcp_usr_attach,
813 .pru_bind = tcp_usr_bind,
814 .pru_connect = tcp_usr_connect,
815 .pru_control = in_control,
816 .pru_detach = tcp_usr_detach,
817 .pru_disconnect = tcp_usr_disconnect,
818 .pru_listen = tcp_usr_listen,
819 .pru_peeraddr = tcp_peeraddr,
820 .pru_rcvd = tcp_usr_rcvd,
821 .pru_rcvoob = tcp_usr_rcvoob,
822 .pru_send = tcp_usr_send,
823 .pru_shutdown = tcp_usr_shutdown,
824 .pru_sockaddr = tcp_sockaddr,
825 .pru_sosetlabel = in_pcbsosetlabel
826};
827
828#ifdef INET6
829struct pr_usrreqs tcp6_usrreqs = {
830 .pru_abort = tcp_usr_abort,
831 .pru_accept = tcp6_usr_accept,
832 .pru_attach = tcp_usr_attach,
833 .pru_bind = tcp6_usr_bind,
834 .pru_connect = tcp6_usr_connect,
835 .pru_control = in6_control,
836 .pru_detach = tcp_usr_detach,
837 .pru_disconnect = tcp_usr_disconnect,
838 .pru_listen = tcp6_usr_listen,
839 .pru_peeraddr = in6_mapped_peeraddr,
840 .pru_rcvd = tcp_usr_rcvd,
841 .pru_rcvoob = tcp_usr_rcvoob,
842 .pru_send = tcp_usr_send,
843 .pru_shutdown = tcp_usr_shutdown,
844 .pru_sockaddr = in6_mapped_sockaddr,
845 .pru_sosetlabel = in_pcbsosetlabel
846};
847#endif /* INET6 */
848
849/*
850 * Common subroutine to open a TCP connection to remote host specified
851 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
852 * port number if needed. Call in_pcbconnect_setup to do the routing and
853 * to choose a local host address (interface). If there is an existing
854 * incarnation of the same connection in TIME-WAIT state and if the remote
855 * host was sending CC options and if the connection duration was < MSL, then
856 * truncate the previous TIME-WAIT state and proceed.
857 * Initialize connection parameters and enter SYN-SENT state.
858 */
859static int
860tcp_connect(tp, nam, td)
861 register struct tcpcb *tp;
862 struct sockaddr *nam;
863 struct thread *td;
864{
865 struct inpcb *inp = tp->t_inpcb, *oinp;
866 struct socket *so = inp->inp_socket;
867 struct in_addr laddr;
868 u_short lport;
869 int error;
870
871 if (inp->inp_lport == 0) {
872 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
873 if (error)
874 return error;
875 }
876
877 /*
878 * Cannot simply call in_pcbconnect, because there might be an
879 * earlier incarnation of this same connection still in
880 * TIME_WAIT state, creating an ADDRINUSE error.
881 */
882 laddr = inp->inp_laddr;
883 lport = inp->inp_lport;
884 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
885 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
886 if (error && oinp == NULL)
887 return error;
888 if (oinp)
889 return EADDRINUSE;
890 inp->inp_laddr = laddr;
891 in_pcbrehash(inp);
892
893 /* Compute window scaling to request. */
894 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
895 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
896 tp->request_r_scale++;
897
898 soisconnecting(so);
899 tcpstat.tcps_connattempt++;
900 tp->t_state = TCPS_SYN_SENT;
901 callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp);
902 tp->iss = tcp_new_isn(tp);
903 tp->t_bw_rtseq = tp->iss;
904 tcp_sendseqinit(tp);
905
906 return 0;
907}
908
909#ifdef INET6
910static int
911tcp6_connect(tp, nam, td)
912 register struct tcpcb *tp;
913 struct sockaddr *nam;
914 struct thread *td;
915{
916 struct inpcb *inp = tp->t_inpcb, *oinp;
917 struct socket *so = inp->inp_socket;
918 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
919 struct in6_addr *addr6;
920 int error;
921
922 if (inp->inp_lport == 0) {
923 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
924 if (error)
925 return error;
926 }
927
928 /*
929 * Cannot simply call in_pcbconnect, because there might be an
930 * earlier incarnation of this same connection still in
931 * TIME_WAIT state, creating an ADDRINUSE error.
932 * in6_pcbladdr() also handles scope zone IDs.
933 */
934 error = in6_pcbladdr(inp, nam, &addr6);
935 if (error)
936 return error;
937 oinp = in6_pcblookup_hash(inp->inp_pcbinfo,
938 &sin6->sin6_addr, sin6->sin6_port,
939 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
940 ? addr6
941 : &inp->in6p_laddr,
942 inp->inp_lport, 0, NULL);
943 if (oinp)
944 return EADDRINUSE;
945 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
946 inp->in6p_laddr = *addr6;
947 inp->in6p_faddr = sin6->sin6_addr;
948 inp->inp_fport = sin6->sin6_port;
949 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
950 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
951 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
952 inp->in6p_flowinfo |=
953 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
954 in_pcbrehash(inp);
955
956 /* Compute window scaling to request. */
957 while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
958 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
959 tp->request_r_scale++;
960
961 soisconnecting(so);
962 tcpstat.tcps_connattempt++;
963 tp->t_state = TCPS_SYN_SENT;
964 callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp);
965 tp->iss = tcp_new_isn(tp);
966 tp->t_bw_rtseq = tp->iss;
967 tcp_sendseqinit(tp);
968
969 return 0;
970}
971#endif /* INET6 */
972
973/*
974 * Export TCP internal state information via a struct tcp_info, based on the
975 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently
976 * (TCP state machine, etc). We export all information using FreeBSD-native
977 * constants -- for example, the numeric values for tcpi_state will differ
978 * from Linux.
979 */
980static void
981tcp_fill_info(tp, ti)
982 struct tcpcb *tp;
983 struct tcp_info *ti;
984{
985
986 INP_LOCK_ASSERT(tp->t_inpcb);
987 bzero(ti, sizeof(*ti));
988
989 ti->tcpi_state = tp->t_state;
990 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
991 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
992 if (tp->sack_enable)
993 ti->tcpi_options |= TCPI_OPT_SACK;
994 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
995 ti->tcpi_options |= TCPI_OPT_WSCALE;
996 ti->tcpi_snd_wscale = tp->snd_scale;
997 ti->tcpi_rcv_wscale = tp->rcv_scale;
998 }
999 ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1000 ti->tcpi_snd_cwnd = tp->snd_cwnd;
1001
1002 /*
1003 * FreeBSD-specific extension fields for tcp_info.
1004 */
1005 ti->tcpi_rcv_space = tp->rcv_wnd;
1006 ti->tcpi_snd_wnd = tp->snd_wnd;
1007 ti->tcpi_snd_bwnd = tp->snd_bwnd;
1008}
1009
1010/*
1011 * The new sockopt interface makes it possible for us to block in the
1012 * copyin/out step (if we take a page fault). Taking a page fault at
1013 * splnet() is probably a Bad Thing. (Since sockets and pcbs both now
1014 * use TSM, there probably isn't any need for this function to run at
1015 * splnet() any more. This needs more examination.)
1016 *
1017 * XXXRW: The locking here is wrong; we may take a page fault while holding
1018 * the inpcb lock.
1019 */
1020int
1021tcp_ctloutput(so, sopt)
1022 struct socket *so;
1023 struct sockopt *sopt;
1024{
1025 int error, opt, optval;
1026 struct inpcb *inp;
1027 struct tcpcb *tp;
1028 struct tcp_info ti;
1029
1030 error = 0;
1031 INP_INFO_RLOCK(&tcbinfo);
1032 inp = sotoinpcb(so);
1033 if (inp == NULL) {
1034 INP_INFO_RUNLOCK(&tcbinfo);
1035 return (ECONNRESET);
1036 }
1037 INP_LOCK(inp);
1038 INP_INFO_RUNLOCK(&tcbinfo);
1039 if (sopt->sopt_level != IPPROTO_TCP) {
1040 INP_UNLOCK(inp);
1041#ifdef INET6
1042 if (INP_CHECK_SOCKAF(so, AF_INET6))
1043 error = ip6_ctloutput(so, sopt);
1044 else
1045#endif /* INET6 */
1046 error = ip_ctloutput(so, sopt);
1047 return (error);
1048 }
1049 tp = intotcpcb(inp);
1050
1051 switch (sopt->sopt_dir) {
1052 case SOPT_SET:
1053 switch (sopt->sopt_name) {
1054#ifdef TCP_SIGNATURE
1055 case TCP_MD5SIG:
1056 error = sooptcopyin(sopt, &optval, sizeof optval,
1057 sizeof optval);
1058 if (error)
1059 break;
1060
1061 if (optval > 0)
1062 tp->t_flags |= TF_SIGNATURE;
1063 else
1064 tp->t_flags &= ~TF_SIGNATURE;
1065 break;
1066#endif /* TCP_SIGNATURE */
1067 case TCP_NODELAY:
1068 case TCP_NOOPT:
1069 error = sooptcopyin(sopt, &optval, sizeof optval,
1070 sizeof optval);
1071 if (error)
1072 break;
1073
1074 switch (sopt->sopt_name) {
1075 case TCP_NODELAY:
1076 opt = TF_NODELAY;
1077 break;
1078 case TCP_NOOPT:
1079 opt = TF_NOOPT;
1080 break;
1081 default:
1082 opt = 0; /* dead code to fool gcc */
1083 break;
1084 }
1085
1086 if (optval)
1087 tp->t_flags |= opt;
1088 else
1089 tp->t_flags &= ~opt;
1090 break;
1091
1092 case TCP_NOPUSH:
1093 error = sooptcopyin(sopt, &optval, sizeof optval,
1094 sizeof optval);
1095 if (error)
1096 break;
1097
1098 if (optval)
1099 tp->t_flags |= TF_NOPUSH;
1100 else {
1101 tp->t_flags &= ~TF_NOPUSH;
1102 error = tcp_output(tp);
1103 }
1104 break;
1105
1106 case TCP_MAXSEG:
1107 error = sooptcopyin(sopt, &optval, sizeof optval,
1108 sizeof optval);
1109 if (error)
1110 break;
1111
1112 if (optval > 0 && optval <= tp->t_maxseg &&
1113 optval + 40 >= tcp_minmss)
1114 tp->t_maxseg = optval;
1115 else
1116 error = EINVAL;
1117 break;
1118
1119 case TCP_INFO:
1120 error = EINVAL;
1121 break;
1122
1123 default:
1124 error = ENOPROTOOPT;
1125 break;
1126 }
1127 break;
1128
1129 case SOPT_GET:
1130 switch (sopt->sopt_name) {
1131#ifdef TCP_SIGNATURE
1132 case TCP_MD5SIG:
1133 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1134 error = sooptcopyout(sopt, &optval, sizeof optval);
1135 break;
1136#endif
1137 case TCP_NODELAY:
1138 optval = tp->t_flags & TF_NODELAY;
1139 error = sooptcopyout(sopt, &optval, sizeof optval);
1140 break;
1141 case TCP_MAXSEG:
1142 optval = tp->t_maxseg;
1143 error = sooptcopyout(sopt, &optval, sizeof optval);
1144 break;
1145 case TCP_NOOPT:
1146 optval = tp->t_flags & TF_NOOPT;
1147 error = sooptcopyout(sopt, &optval, sizeof optval);
1148 break;
1149 case TCP_NOPUSH:
1150 optval = tp->t_flags & TF_NOPUSH;
1151 error = sooptcopyout(sopt, &optval, sizeof optval);
1152 break;
1153 case TCP_INFO:
1154 tcp_fill_info(tp, &ti);
1155 error = sooptcopyout(sopt, &ti, sizeof ti);
1156 break;
1157 default:
1158 error = ENOPROTOOPT;
1159 break;
1160 }
1161 break;
1162 }
1163 INP_UNLOCK(inp);
1164 return (error);
1165}
1166
1167/*
1168 * tcp_sendspace and tcp_recvspace are the default send and receive window
1169 * sizes, respectively. These are obsolescent (this information should
1170 * be set by the route).
1171 */
1172u_long tcp_sendspace = 1024*32;
1173SYSCTL_ULONG(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1174 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1175u_long tcp_recvspace = 1024*64;
1176SYSCTL_ULONG(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1177 &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1178
1179/*
1180 * Attach TCP protocol to socket, allocating
1181 * internet protocol control block, tcp control block,
1182 * bufer space, and entering LISTEN state if to accept connections.
1183 */
1184static int
1185tcp_attach(so)
1186 struct socket *so;
1187{
1188 register struct tcpcb *tp;
1189 struct inpcb *inp;
1190 int error;
1191#ifdef INET6
1192 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
1193#endif
1194
1195 INP_INFO_WLOCK_ASSERT(&tcbinfo);
1196
1197 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1198 error = soreserve(so, tcp_sendspace, tcp_recvspace);
1199 if (error)
1200 return (error);
1201 }
1202 error = in_pcballoc(so, &tcbinfo, "tcpinp");
1203 if (error)
1204 return (error);
1205 inp = sotoinpcb(so);
1206#ifdef INET6
1207 if (isipv6) {
1208 inp->inp_vflag |= INP_IPV6;
1209 inp->in6p_hops = -1; /* use kernel default */
1210 }
1211 else
1212#endif
1213 inp->inp_vflag |= INP_IPV4;
1214 tp = tcp_newtcpcb(inp);
1215 if (tp == 0) {
1216 int nofd = so->so_state & SS_NOFDREF; /* XXX */
1217
1218 so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */
1219
1220 INP_LOCK(inp);
1221#ifdef INET6
1222 if (isipv6)
1223 in6_pcbdetach(inp);
1224 else
1225#endif
1226 in_pcbdetach(inp);
1227 so->so_state |= nofd;
1228 return (ENOBUFS);
1229 }
1230 tp->t_state = TCPS_CLOSED;
1231 return (0);
1232}
1233
1234/*
1235 * Initiate (or continue) disconnect.
1236 * If embryonic state, just send reset (once).
1237 * If in ``let data drain'' option and linger null, just drop.
1238 * Otherwise (hard), mark socket disconnecting and drop
1239 * current input data; switch states based on user close, and
1240 * send segment to peer (with FIN).
1241 */
1242static struct tcpcb *
1243tcp_disconnect(tp)
1244 register struct tcpcb *tp;
1245{
1246 struct inpcb *inp = tp->t_inpcb;
1247 struct socket *so = inp->inp_socket;
1248
1249 INP_INFO_WLOCK_ASSERT(&tcbinfo);
1250 INP_LOCK_ASSERT(inp);
1251
1252 if (tp->t_state < TCPS_ESTABLISHED)
1253 tp = tcp_close(tp);
1254 else if ((so->so_options & SO_LINGER) && so->so_linger == 0)
1255 tp = tcp_drop(tp, 0);
1256 else {
1257 soisdisconnecting(so);
1258 sbflush(&so->so_rcv);
1259 tp = tcp_usrclosed(tp);
1260 if (tp)
1261 (void) tcp_output(tp);
1262 }
1263 return (tp);
1264}
1265
1266/*
1267 * User issued close, and wish to trail through shutdown states:
1268 * if never received SYN, just forget it. If got a SYN from peer,
1269 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1270 * If already got a FIN from peer, then almost done; go to LAST_ACK
1271 * state. In all other cases, have already sent FIN to peer (e.g.
1272 * after PRU_SHUTDOWN), and just have to play tedious game waiting
1273 * for peer to send FIN or not respond to keep-alives, etc.
1274 * We can let the user exit from the close as soon as the FIN is acked.
1275 */
1276static struct tcpcb *
1277tcp_usrclosed(tp)
1278 register struct tcpcb *tp;
1279{
1280
1281 INP_INFO_WLOCK_ASSERT(&tcbinfo);
1282 INP_LOCK_ASSERT(tp->t_inpcb);
1283
1284 switch (tp->t_state) {
1285
1286 case TCPS_CLOSED:
1287 case TCPS_LISTEN:
1288 tp->t_state = TCPS_CLOSED;
1289 tp = tcp_close(tp);
1290 break;
1291
1292 case TCPS_SYN_SENT:
1293 case TCPS_SYN_RECEIVED:
1294 tp->t_flags |= TF_NEEDFIN;
1295 break;
1296
1297 case TCPS_ESTABLISHED:
1298 tp->t_state = TCPS_FIN_WAIT_1;
1299 break;
1300
1301 case TCPS_CLOSE_WAIT:
1302 tp->t_state = TCPS_LAST_ACK;
1303 break;
1304 }
1305 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
1306 soisdisconnected(tp->t_inpcb->inp_socket);
1307 /* To prevent the connection hanging in FIN_WAIT_2 forever. */
1308 if (tp->t_state == TCPS_FIN_WAIT_2)
1309 callout_reset(tp->tt_2msl, tcp_maxidle,
1310 tcp_timer_2msl, tp);
1311 }
1312 return (tp);
1313}
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