1 /*
2 * Copyright (c) 2000-2001 Boris Popov
3 * 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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Boris Popov.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $FreeBSD: src/sys/netsmb/smb_trantcp.c,v 1.3.2.1 2001/05/22 08:32:34 bp Exp $
33 */
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/mbuf.h>
39 #include <sys/proc.h>
40 #include <sys/protosw.h>
41 #include <sys/resourcevar.h>
42 #include <sys/socket.h>
43 #include <sys/socketvar.h>
44 #include <sys/socketvar2.h>
45 #include <sys/socketops.h>
46 #include <sys/poll.h>
47 #include <sys/uio.h>
48 #include <sys/fcntl.h>
49 #include <sys/sysctl.h>
50 #include <sys/thread2.h>
51
52 #include <net/if.h>
53 #include <net/route.h>
54
55 #include <netinet/in.h>
56 #include <netinet/tcp.h>
57
58 #include <sys/mchain.h>
59
60 #include "netbios.h"
61
62 #include "smb.h"
63 #include "smb_conn.h"
64 #include "smb_tran.h"
65 #include "smb_trantcp.h"
66 #include "smb_subr.h"
67
68 #define M_NBDATA M_PCB
69
70 static int smb_tcpsndbuf = 10 * 1024;
71 static int smb_tcprcvbuf = 10 * 1024;
72
73 SYSCTL_DECL(_net_smb);
74 SYSCTL_INT(_net_smb, OID_AUTO, tcpsndbuf, CTLFLAG_RW, &smb_tcpsndbuf, 0, "");
75 SYSCTL_INT(_net_smb, OID_AUTO, tcprcvbuf, CTLFLAG_RW, &smb_tcprcvbuf, 0, "");
76
77 #define nb_sosend(so,m,flags,p) \
78 so_pru_sosend(so, NULL, NULL, m, NULL, flags, td)
79
80 static int nbssn_recv(struct nbpcb *nbp, struct mbuf **mpp, int *lenp,
81 u_int8_t *rpcodep, struct thread *td);
82 static int smb_nbst_disconnect(struct smb_vc *vcp, struct thread *td);
83
84 static int
nb_setsockopt_int(struct socket * so,int level,int name,int val)85 nb_setsockopt_int(struct socket *so, int level, int name, int val)
86 {
87 struct sockopt sopt;
88
89 bzero(&sopt, sizeof(sopt));
90 sopt.sopt_level = level;
91 sopt.sopt_name = name;
92 sopt.sopt_val = &val;
93 sopt.sopt_valsize = sizeof(val);
94 return sosetopt(so, &sopt);
95 }
96
97 static int
nb_intr(struct nbpcb * nbp,struct thread * td)98 nb_intr(struct nbpcb *nbp, struct thread *td)
99 {
100 return 0;
101 }
102
103 static void
nb_upcall(struct socket * so,void * arg,int waitflag)104 nb_upcall(struct socket *so, void *arg, int waitflag)
105 {
106 struct nbpcb *nbp = arg;
107
108 if (arg == NULL || nbp->nbp_selectid == NULL)
109 return;
110 wakeup(nbp->nbp_selectid);
111 }
112
113 static int
nb_sethdr(struct mbuf * m,u_int8_t type,u_int32_t len)114 nb_sethdr(struct mbuf *m, u_int8_t type, u_int32_t len)
115 {
116 u_int32_t *p = mtod(m, u_int32_t *);
117
118 *p = htonl((len & 0x1FFFF) | (type << 24));
119 return 0;
120 }
121
122 static int
nb_put_name(struct mbchain * mbp,struct sockaddr_nb * snb)123 nb_put_name(struct mbchain *mbp, struct sockaddr_nb *snb)
124 {
125 int error;
126 u_char seglen, *cp;
127
128 cp = snb->snb_name;
129 if (*cp == 0)
130 return EINVAL;
131 NBDEBUG("[%s]\n", cp);
132 for (;;) {
133 seglen = (*cp) + 1;
134 error = mb_put_mem(mbp, cp, seglen, MB_MSYSTEM);
135 if (error)
136 return error;
137 if (seglen == 1)
138 break;
139 cp += seglen;
140 }
141 return 0;
142 }
143
144 static int
nb_connect_in(struct nbpcb * nbp,struct sockaddr_in * to,struct thread * td)145 nb_connect_in(struct nbpcb *nbp, struct sockaddr_in *to, struct thread *td)
146 {
147 struct socket *so;
148 int error;
149
150 error = socreate(AF_INET, &so, SOCK_STREAM, IPPROTO_TCP, td);
151 if (error)
152 return error;
153 nbp->nbp_tso = so;
154 so->so_upcallarg = (caddr_t)nbp;
155 so->so_upcall = nb_upcall;
156 atomic_set_int(&so->so_rcv.ssb_flags, SSB_UPCALL);
157 so->so_rcv.ssb_timeo = (5 * hz);
158 so->so_snd.ssb_timeo = (5 * hz);
159 error = soreserve(so, nbp->nbp_sndbuf, nbp->nbp_rcvbuf,
160 &td->td_proc->p_rlimit[RLIMIT_SBSIZE]);
161 if (error)
162 goto bad;
163 nb_setsockopt_int(so, SOL_SOCKET, SO_KEEPALIVE, 1);
164 nb_setsockopt_int(so, IPPROTO_TCP, TCP_NODELAY, 1);
165 atomic_clear_int(&so->so_rcv.ssb_flags, SSB_NOINTR);
166 atomic_clear_int(&so->so_snd.ssb_flags, SSB_NOINTR);
167 error = soconnect(so, (struct sockaddr*)to, td, TRUE);
168
169 /*
170 * If signals are allowed nbssn_recv() can wind up in a hard loop
171 * on EWOULDBLOCK.
172 */
173 atomic_set_int(&so->so_rcv.ssb_flags, SSB_NOINTR);
174 atomic_set_int(&so->so_snd.ssb_flags, SSB_NOINTR);
175 if (error)
176 goto bad;
177 crit_enter();
178 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
179 tsleep(&so->so_timeo, 0, "nbcon", 2 * hz);
180 if ((so->so_state & SS_ISCONNECTING) && so->so_error == 0 &&
181 (error = nb_intr(nbp, td)) != 0) {
182 soclrstate(so, SS_ISCONNECTING);
183 crit_exit();
184 goto bad;
185 }
186 }
187 if (so->so_error) {
188 error = so->so_error;
189 so->so_error = 0;
190 crit_exit();
191 goto bad;
192 }
193 crit_exit();
194 return 0;
195 bad:
196 smb_nbst_disconnect(nbp->nbp_vc, td);
197 return error;
198 }
199
200 static int
nbssn_rq_request(struct nbpcb * nbp,struct thread * td)201 nbssn_rq_request(struct nbpcb *nbp, struct thread *td)
202 {
203 struct mbchain mb, *mbp = &mb;
204 struct mdchain md, *mdp = &md;
205 struct mbuf *m0;
206 struct sockaddr_in sin;
207 u_short port;
208 u_int8_t rpcode;
209 int error, rplen, res;
210
211 error = mb_init(mbp);
212 if (error)
213 return error;
214 mb_put_uint32le(mbp, 0);
215 nb_put_name(mbp, nbp->nbp_paddr);
216 nb_put_name(mbp, nbp->nbp_laddr);
217 nb_sethdr(mbp->mb_top, NB_SSN_REQUEST, mb_fixhdr(mbp) - 4);
218 error = nb_sosend(nbp->nbp_tso, mbp->mb_top, 0, td);
219 if (!error) {
220 nbp->nbp_state = NBST_RQSENT;
221 }
222 mb_detach(mbp);
223 mb_done(mbp);
224 if (error)
225 return error;
226 error = socket_wait(nbp->nbp_tso, &nbp->nbp_timo, &res);
227 if (error == EWOULDBLOCK) { /* Timeout */
228 NBDEBUG("initial request timeout\n");
229 return ETIMEDOUT;
230 }
231 if (error) /* restart or interrupt */
232 return error;
233 error = nbssn_recv(nbp, &m0, &rplen, &rpcode, td);
234 if (error) {
235 NBDEBUG("recv() error %d\n", error);
236 return error;
237 }
238 /*
239 * Process NETBIOS reply
240 */
241 if (m0)
242 md_initm(mdp, m0);
243 error = 0;
244 do {
245 if (rpcode == NB_SSN_POSRESP) {
246 nbp->nbp_state = NBST_SESSION;
247 nbp->nbp_flags |= NBF_CONNECTED;
248 break;
249 }
250 if (rpcode != NB_SSN_RTGRESP) {
251 error = ECONNABORTED;
252 break;
253 }
254 if (rplen != 6) {
255 error = ECONNABORTED;
256 break;
257 }
258 md_get_mem(mdp, (caddr_t)&sin.sin_addr, 4, MB_MSYSTEM);
259 md_get_uint16(mdp, &port);
260 sin.sin_port = port;
261 nbp->nbp_state = NBST_RETARGET;
262 smb_nbst_disconnect(nbp->nbp_vc, td);
263 error = nb_connect_in(nbp, &sin, td);
264 if (!error)
265 error = nbssn_rq_request(nbp, td);
266 if (error) {
267 smb_nbst_disconnect(nbp->nbp_vc, td);
268 break;
269 }
270 } while(0);
271 if (m0)
272 md_done(mdp);
273 return error;
274 }
275
276 static int
nbssn_recvhdr(struct nbpcb * nbp,int * lenp,u_int8_t * rpcodep,int flags,struct thread * td)277 nbssn_recvhdr(struct nbpcb *nbp, int *lenp,
278 u_int8_t *rpcodep, int flags, struct thread *td)
279 {
280 struct socket *so = nbp->nbp_tso;
281 struct uio auio;
282 struct iovec aio;
283 u_int32_t len;
284 int error;
285
286 aio.iov_base = (caddr_t)&len;
287 aio.iov_len = sizeof(len);
288 auio.uio_iov = &aio;
289 auio.uio_iovcnt = 1;
290 auio.uio_segflg = UIO_SYSSPACE;
291 auio.uio_rw = UIO_READ;
292 auio.uio_offset = 0;
293 auio.uio_resid = sizeof(len);
294 auio.uio_td = td;
295 error = so_pru_soreceive(so, NULL, &auio, NULL, NULL, &flags);
296 if (error)
297 return error;
298 if (auio.uio_resid > 0) {
299 SMBSDEBUG("short reply\n");
300 return EPIPE;
301 }
302 len = ntohl(len);
303 *rpcodep = (len >> 24) & 0xFF;
304 len &= 0x1ffff;
305 if (len > SMB_MAXPKTLEN) {
306 SMBERROR("packet too long (%d)\n", len);
307 return EFBIG;
308 }
309 *lenp = len;
310 return 0;
311 }
312
313 static int
nbssn_recv(struct nbpcb * nbp,struct mbuf ** mpp,int * lenp,u_int8_t * rpcodep,struct thread * td)314 nbssn_recv(struct nbpcb *nbp, struct mbuf **mpp, int *lenp,
315 u_int8_t *rpcodep, struct thread *td)
316 {
317 struct socket *so = nbp->nbp_tso;
318 struct sockbuf sio;
319 int error, rcvflg;
320 int savelen = 0;
321 u_int8_t rpcode = 0;
322
323 if (so == NULL)
324 return ENOTCONN;
325
326 sbinit(&sio, 0);
327 if (mpp)
328 *mpp = NULL;
329
330 for(;;) {
331 error = nbssn_recvhdr(nbp, &savelen, &rpcode, MSG_DONTWAIT, td);
332 if (so->so_state &
333 (SS_ISDISCONNECTING | SS_ISDISCONNECTED | SS_CANTRCVMORE)) {
334 nbp->nbp_state = NBST_CLOSED;
335 NBDEBUG("session closed by peer\n");
336 error = ECONNRESET;
337 break;
338 }
339 if (error)
340 break;
341 if (savelen == 0 && nbp->nbp_state != NBST_SESSION)
342 break;
343 if (rpcode == NB_SSN_KEEPALIVE)
344 continue;
345 do {
346 sbinit(&sio, savelen);
347 rcvflg = MSG_WAITALL;
348 error = so_pru_soreceive(so, NULL, NULL, &sio,
349 NULL, &rcvflg);
350 } while (error == EWOULDBLOCK || error == EINTR ||
351 error == ERESTART);
352 if (error)
353 break;
354 if (sio.sb_cc != savelen) {
355 SMBERROR("packet is shorter than expected\n");
356 error = EPIPE;
357 m_freem(sio.sb_mb);
358 break;
359 }
360 if (nbp->nbp_state == NBST_SESSION && rpcode == NB_SSN_MESSAGE)
361 break;
362 NBDEBUG("non-session packet %x\n", rpcode);
363 m_freem(sio.sb_mb);
364 sio.sb_mb = NULL;
365 sio.sb_cc = 0;
366 }
367 if (error == 0) {
368 if (mpp)
369 *mpp = sio.sb_mb;
370 else
371 m_freem(sio.sb_mb);
372 *lenp = sio.sb_cc;
373 *rpcodep = rpcode;
374 }
375 return (error);
376 }
377
378 /*
379 * SMB transport interface
380 */
381 static int
smb_nbst_create(struct smb_vc * vcp,struct thread * td)382 smb_nbst_create(struct smb_vc *vcp, struct thread *td)
383 {
384 struct nbpcb *nbp;
385
386 nbp = kmalloc(sizeof *nbp, M_NBDATA, M_WAITOK | M_ZERO);
387 nbp->nbp_timo.tv_sec = 15; /* XXX: sysctl ? */
388 nbp->nbp_state = NBST_CLOSED;
389 nbp->nbp_vc = vcp;
390 nbp->nbp_sndbuf = smb_tcpsndbuf;
391 nbp->nbp_rcvbuf = smb_tcprcvbuf;
392 vcp->vc_tdata = nbp;
393 return 0;
394 }
395
396 static int
smb_nbst_done(struct smb_vc * vcp,struct thread * td)397 smb_nbst_done(struct smb_vc *vcp, struct thread *td)
398 {
399 struct nbpcb *nbp = vcp->vc_tdata;
400
401 if (nbp == NULL)
402 return ENOTCONN;
403 smb_nbst_disconnect(vcp, td);
404 if (nbp->nbp_laddr)
405 kfree(nbp->nbp_laddr, M_SONAME);
406 if (nbp->nbp_paddr)
407 kfree(nbp->nbp_paddr, M_SONAME);
408 kfree(nbp, M_NBDATA);
409 return 0;
410 }
411
412 static int
smb_nbst_bind(struct smb_vc * vcp,struct sockaddr * sap,struct thread * td)413 smb_nbst_bind(struct smb_vc *vcp, struct sockaddr *sap, struct thread *td)
414 {
415 struct nbpcb *nbp = vcp->vc_tdata;
416 struct sockaddr_nb *snb;
417 int error, slen;
418
419 NBDEBUG("\n");
420 error = EINVAL;
421 do {
422 if (nbp->nbp_flags & NBF_LOCADDR)
423 break;
424 /*
425 * It is possible to create NETBIOS name in the kernel,
426 * but nothing prevents us to do it in the user space.
427 */
428 if (sap == NULL)
429 break;
430 slen = sap->sa_len;
431 if (slen < NB_MINSALEN)
432 break;
433 snb = (struct sockaddr_nb*)dup_sockaddr(sap);
434 if (snb == NULL) {
435 error = ENOMEM;
436 break;
437 }
438 nbp->nbp_laddr = snb;
439 nbp->nbp_flags |= NBF_LOCADDR;
440 error = 0;
441 } while(0);
442 return error;
443 }
444
445 static int
smb_nbst_connect(struct smb_vc * vcp,struct sockaddr * sap,struct thread * td)446 smb_nbst_connect(struct smb_vc *vcp, struct sockaddr *sap, struct thread *td)
447 {
448 struct nbpcb *nbp = vcp->vc_tdata;
449 struct sockaddr_in sin;
450 struct sockaddr_nb *snb;
451 struct timespec ts1, ts2;
452 int error, slen;
453
454 NBDEBUG("\n");
455 if (nbp->nbp_tso != NULL)
456 return EISCONN;
457 if (nbp->nbp_laddr == NULL)
458 return EINVAL;
459 slen = sap->sa_len;
460 if (slen < NB_MINSALEN)
461 return EINVAL;
462 if (nbp->nbp_paddr) {
463 kfree(nbp->nbp_paddr, M_SONAME);
464 nbp->nbp_paddr = NULL;
465 }
466 snb = (struct sockaddr_nb*)dup_sockaddr(sap);
467 if (snb == NULL)
468 return ENOMEM;
469 nbp->nbp_paddr = snb;
470 sin = snb->snb_addrin;
471 getnanotime(&ts1);
472 error = nb_connect_in(nbp, &sin, td);
473 if (error)
474 return error;
475 getnanotime(&ts2);
476 timespecsub(&ts2, &ts1, &ts2);
477 if (ts2.tv_sec == 0) {
478 ts2.tv_sec = 1;
479 ts2.tv_nsec = 0;
480 }
481 timespecadd(&ts2, &ts2, &nbp->nbp_timo);
482 timespecadd(&nbp->nbp_timo, &ts2, &nbp->nbp_timo);
483 timespecadd(&nbp->nbp_timo, &ts2, &nbp->nbp_timo); /* * 4 */
484 error = nbssn_rq_request(nbp, td);
485 if (error)
486 smb_nbst_disconnect(vcp, td);
487 return error;
488 }
489
490 static int
smb_nbst_disconnect(struct smb_vc * vcp,struct thread * td)491 smb_nbst_disconnect(struct smb_vc *vcp, struct thread *td)
492 {
493 struct nbpcb *nbp = vcp->vc_tdata;
494 struct socket *so;
495
496 if (nbp == NULL || nbp->nbp_tso == NULL)
497 return ENOTCONN;
498 if ((so = nbp->nbp_tso) != NULL) {
499 nbp->nbp_flags &= ~NBF_CONNECTED;
500 nbp->nbp_tso = NULL;
501 soshutdown(so, SHUT_RDWR);
502 soclose(so, FNONBLOCK);
503 }
504 if (nbp->nbp_state != NBST_RETARGET) {
505 nbp->nbp_state = NBST_CLOSED;
506 }
507 return 0;
508 }
509
510 static int
smb_nbst_send(struct smb_vc * vcp,struct mbuf * m0,struct thread * td)511 smb_nbst_send(struct smb_vc *vcp, struct mbuf *m0, struct thread *td)
512 {
513 struct nbpcb *nbp = vcp->vc_tdata;
514 int error;
515
516 if (nbp->nbp_state != NBST_SESSION) {
517 error = ENOTCONN;
518 goto abort;
519 }
520 M_PREPEND(m0, 4, M_WAITOK);
521 nb_sethdr(m0, NB_SSN_MESSAGE, m_fixhdr(m0) - 4);
522 error = nb_sosend(nbp->nbp_tso, m0, 0, td);
523 return error;
524 abort:
525 if (m0)
526 m_freem(m0);
527 return error;
528 }
529
530
531 static int
smb_nbst_recv(struct smb_vc * vcp,struct mbuf ** mpp,struct thread * td)532 smb_nbst_recv(struct smb_vc *vcp, struct mbuf **mpp, struct thread *td)
533 {
534 struct nbpcb *nbp = vcp->vc_tdata;
535 u_int8_t rpcode;
536 int error, rplen;
537
538 nbp->nbp_flags |= NBF_RECVLOCK;
539 error = nbssn_recv(nbp, mpp, &rplen, &rpcode, td);
540 nbp->nbp_flags &= ~NBF_RECVLOCK;
541 return error;
542 }
543
544 static void
smb_nbst_timo(struct smb_vc * vcp)545 smb_nbst_timo(struct smb_vc *vcp)
546 {
547 return;
548 }
549
550 static void
smb_nbst_intr(struct smb_vc * vcp)551 smb_nbst_intr(struct smb_vc *vcp)
552 {
553 struct nbpcb *nbp = vcp->vc_tdata;
554
555 if (nbp == NULL || nbp->nbp_tso == NULL)
556 return;
557 sorwakeup(nbp->nbp_tso);
558 sowwakeup(nbp->nbp_tso);
559 }
560
561 static int
smb_nbst_getparam(struct smb_vc * vcp,int param,void * data)562 smb_nbst_getparam(struct smb_vc *vcp, int param, void *data)
563 {
564 struct nbpcb *nbp = vcp->vc_tdata;
565
566 switch (param) {
567 case SMBTP_SNDSZ:
568 *(int*)data = nbp->nbp_sndbuf;
569 break;
570 case SMBTP_RCVSZ:
571 *(int*)data = nbp->nbp_rcvbuf;
572 break;
573 case SMBTP_TIMEOUT:
574 *(struct timespec*)data = nbp->nbp_timo;
575 break;
576 default:
577 return EINVAL;
578 }
579 return 0;
580 }
581
582 static int
smb_nbst_setparam(struct smb_vc * vcp,int param,void * data)583 smb_nbst_setparam(struct smb_vc *vcp, int param, void *data)
584 {
585 struct nbpcb *nbp = vcp->vc_tdata;
586
587 switch (param) {
588 case SMBTP_SELECTID:
589 nbp->nbp_selectid = data;
590 break;
591 default:
592 return EINVAL;
593 }
594 return 0;
595 }
596
597 /*
598 * Check for fatal errors
599 */
600 static int
smb_nbst_fatal(struct smb_vc * vcp,int error)601 smb_nbst_fatal(struct smb_vc *vcp, int error)
602 {
603 switch (error) {
604 case ENOTCONN:
605 case ENETRESET:
606 case ECONNABORTED:
607 return 1;
608 }
609 return 0;
610 }
611
612
613 struct smb_tran_desc smb_tran_nbtcp_desc = {
614 SMBT_NBTCP,
615 smb_nbst_create, smb_nbst_done,
616 smb_nbst_bind, smb_nbst_connect, smb_nbst_disconnect,
617 smb_nbst_send, smb_nbst_recv,
618 smb_nbst_timo, smb_nbst_intr,
619 smb_nbst_getparam, smb_nbst_setparam,
620 smb_nbst_fatal
621 };
622
623