sys/netinet/sctp_syscalls.c

   1 /*-
   2  * Copyright (c) 1982, 1986, 1989, 1990, 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  * 3. 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  */
  30
  31 #include <sys/cdefs.h>
  32 #include "opt_capsicum.h"
  33 #include "opt_sctp.h"
  34 #include "opt_ktrace.h"
  35
  36 #include <sys/param.h>
  37 #include <sys/systm.h>
  38 #include <sys/capsicum.h>
  39 #include <sys/kernel.h>
  40 #include <sys/lock.h>
  41 #include <sys/mutex.h>
  42 #include <sys/sysproto.h>
  43 #include <sys/malloc.h>
  44 #include <sys/filedesc.h>
  45 #include <sys/event.h>
  46 #include <sys/proc.h>
  47 #include <sys/fcntl.h>
  48 #include <sys/file.h>
  49 #include <sys/filio.h>
  50 #include <sys/jail.h>
  51 #include <sys/mount.h>
  52 #include <sys/mbuf.h>
  53 #include <sys/protosw.h>
  54 #include <sys/sf_buf.h>
  55 #include <sys/sysent.h>
  56 #include <sys/socket.h>
  57 #include <sys/socketvar.h>
  58 #include <sys/signalvar.h>
  59 #include <sys/syscall.h>
  60 #include <sys/syscallsubr.h>
  61 #include <sys/sysctl.h>
  62 #include <sys/uio.h>
  63 #include <sys/vnode.h>
  64 #ifdef KTRACE
  65 #include <sys/ktrace.h>
  66 #endif
  67 #ifdef COMPAT_FREEBSD32
  68 #include <compat/freebsd32/freebsd32.h>
  69 #include <compat/freebsd32/freebsd32_syscall.h>
  70 #include <compat/freebsd32/freebsd32_util.h>
  71 #endif
  72
  73 #include <net/vnet.h>
  74
  75 #include <security/audit/audit.h>
  76 #include <security/mac/mac_framework.h>
  77
  78 #include <netinet/sctp.h>
  79 #include <netinet/sctp_os_bsd.h>
  80 #include <netinet/sctp_peeloff.h>
  81
  82 static struct syscall_helper_data sctp_syscalls[] = {
  83         SYSCALL_INIT_HELPER_F(sctp_peeloff, SYF_CAPENABLED),
  84         SYSCALL_INIT_HELPER_F(sctp_generic_sendmsg, SYF_CAPENABLED),
  85         SYSCALL_INIT_HELPER_F(sctp_generic_sendmsg_iov, SYF_CAPENABLED),
  86         SYSCALL_INIT_HELPER_F(sctp_generic_recvmsg, SYF_CAPENABLED),
  87         SYSCALL_INIT_LAST
  88 };
  89
  90 #ifdef COMPAT_FREEBSD32
  91 static struct syscall_helper_data sctp32_syscalls[] = {
  92         SYSCALL32_INIT_HELPER_COMPAT(sctp_peeloff),
  93         SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_sendmsg),
  94         SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_sendmsg_iov),
  95         SYSCALL32_INIT_HELPER_COMPAT(sctp_generic_recvmsg),
  96         SYSCALL_INIT_LAST
  97 };
  98 #endif
  99
 100 int
 101 sctp_syscalls_init(void)
 102 {
 103         int error;
 104
 105         error = syscall_helper_register(sctp_syscalls, SY_THR_STATIC_KLD);
 106         if (error != 0)
 107                 return (error);
 108 #ifdef COMPAT_FREEBSD32
 109         error = syscall32_helper_register(sctp32_syscalls, SY_THR_STATIC_KLD);
 110         if (error != 0)
 111                 return (error);
 112 #endif
 113         return (0);
 114 }
 115
 116 #ifdef SCTP
 117 SYSINIT(sctp_syscalls, SI_SUB_SYSCALLS, SI_ORDER_ANY, sctp_syscalls_init, NULL);
 118 #endif
 119
 120 int
 121 sctp_syscalls_uninit(void)
 122 {
 123         int error;
 124
 125 #ifdef COMPAT_FREEBSD32
 126         error = syscall32_helper_unregister(sctp32_syscalls);
 127         if (error != 0)
 128                 return (error);
 129 #endif
 130         error = syscall_helper_unregister(sctp_syscalls);
 131         if (error != 0)
 132                 return (error);
 133         return (0);
 134 }
 135
 136 /*
 137  * SCTP syscalls.
 138  */
 139 int
 140 sys_sctp_peeloff(struct thread *td, struct sctp_peeloff_args *uap)
 141 {
 142         struct file *headfp, *nfp = NULL;
 143         struct socket *head, *so;
 144         struct filecaps fcaps;
 145         cap_rights_t rights;
 146         u_int fflag;
 147         int error, fd;
 148
 149         AUDIT_ARG_FD(uap->sd);
 150         error = getsock_cap(td, uap->sd,
 151             cap_rights_init_one(&rights, CAP_PEELOFF), &headfp, &fcaps);
 152         if (error != 0)
 153                 goto done2;
 154         fflag = atomic_load_int(&headfp->f_flag);
 155         head = headfp->f_data;
 156         if (head->so_proto->pr_protocol != IPPROTO_SCTP) {
 157                 error = EOPNOTSUPP;
 158                 goto done;
 159         }
 160         error = sctp_can_peel_off(head, (sctp_assoc_t)uap->name);
 161         if (error != 0)
 162                 goto done;
 163         /*
 164          * At this point we know we do have a assoc to pull
 165          * we proceed to get the fd setup. This may block
 166          * but that is ok.
 167          */
 168
 169         error = falloc_caps(td, &nfp, &fd, 0, &fcaps);
 170         if (error != 0)
 171                 goto done;
 172         td->td_retval[0] = fd;
 173
 174         CURVNET_SET(head->so_vnet);
 175         so = sopeeloff(head);
 176         if (so == NULL) {
 177                 error = ENOMEM;
 178                 goto noconnection;
 179         }
 180         finit(nfp, fflag, DTYPE_SOCKET, so, &socketops);
 181         error = sctp_do_peeloff(head, so, (sctp_assoc_t)uap->name);
 182         if (error != 0)
 183                 goto noconnection;
 184         if (head->so_sigio != NULL)
 185                 fsetown(fgetown(&head->so_sigio), &so->so_sigio);
 186
 187 noconnection:
 188         /*
 189          * close the new descriptor, assuming someone hasn't ripped it
 190          * out from under us.
 191          */
 192         if (error != 0)
 193                 fdclose(td, nfp, fd);
 194
 195         /*
 196          * Release explicitly held references before returning.
 197          */
 198         CURVNET_RESTORE();
 199 done:
 200         if (nfp != NULL)
 201                 fdrop(nfp, td);
 202         fdrop(headfp, td);
 203 done2:
 204         return (error);
 205 }
 206
 207 int
 208 sys_sctp_generic_sendmsg(struct thread *td, struct sctp_generic_sendmsg_args *uap)
 209 {
 210         struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL;
 211         struct socket *so;
 212         struct file *fp = NULL;
 213         struct sockaddr *to = NULL;
 214 #ifdef KTRACE
 215         struct uio *ktruio = NULL;
 216 #endif
 217         struct uio auio;
 218         struct iovec iov[1];
 219         cap_rights_t rights;
 220         int error = 0, len;
 221
 222         if (uap->sinfo != NULL) {
 223                 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo));
 224                 if (error != 0)
 225                         return (error);
 226                 u_sinfo = &sinfo;
 227         }
 228
 229         cap_rights_init_one(&rights, CAP_SEND);
 230         if (uap->tolen != 0) {
 231                 error = getsockaddr(&to, uap->to, uap->tolen);
 232                 if (error != 0) {
 233                         to = NULL;
 234                         goto sctp_bad2;
 235                 }
 236                 cap_rights_set_one(&rights, CAP_CONNECT);
 237         }
 238
 239         AUDIT_ARG_FD(uap->sd);
 240         error = getsock(td, uap->sd, &rights, &fp);
 241         if (error != 0)
 242                 goto sctp_bad;
 243 #ifdef KTRACE
 244         if (to && (KTRPOINT(td, KTR_STRUCT)))
 245                 ktrsockaddr(to);
 246 #endif
 247
 248         iov[0].iov_base = uap->msg;
 249         iov[0].iov_len = uap->mlen;
 250
 251         so = (struct socket *)fp->f_data;
 252         if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
 253                 error = EOPNOTSUPP;
 254                 goto sctp_bad;
 255         }
 256 #ifdef MAC
 257         error = mac_socket_check_send(td->td_ucred, so);
 258         if (error != 0)
 259                 goto sctp_bad;
 260 #endif /* MAC */
 261
 262         auio.uio_iov =  iov;
 263         auio.uio_iovcnt = 1;
 264         auio.uio_segflg = UIO_USERSPACE;
 265         auio.uio_rw = UIO_WRITE;
 266         auio.uio_td = td;
 267         auio.uio_offset = 0;                    /* XXX */
 268         auio.uio_resid = 0;
 269 #ifdef KTRACE
 270         if (KTRPOINT(td, KTR_GENIO))
 271                 ktruio = cloneuio(&auio);
 272 #endif /* KTRACE */
 273         len = auio.uio_resid = uap->mlen;
 274         CURVNET_SET(so->so_vnet);
 275         error = sctp_lower_sosend(so, to, &auio, (struct mbuf *)NULL,
 276             (struct mbuf *)NULL, uap->flags, u_sinfo, td);
 277         CURVNET_RESTORE();
 278         if (error != 0) {
 279                 if (auio.uio_resid != len && (error == ERESTART ||
 280                     error == EINTR || error == EWOULDBLOCK))
 281                         error = 0;
 282                 /* Generation of SIGPIPE can be controlled per socket. */
 283                 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) &&
 284                     !(uap->flags & MSG_NOSIGNAL)) {
 285                         PROC_LOCK(td->td_proc);
 286                         tdsignal(td, SIGPIPE);
 287                         PROC_UNLOCK(td->td_proc);
 288                 }
 289         }
 290         if (error == 0)
 291                 td->td_retval[0] = len - auio.uio_resid;
 292 #ifdef KTRACE
 293         if (ktruio != NULL) {
 294                 if (error == 0)
 295                         ktruio->uio_resid = td->td_retval[0];
 296                 ktrgenio(uap->sd, UIO_WRITE, ktruio, error);
 297         }
 298 #endif /* KTRACE */
 299 sctp_bad:
 300         if (fp != NULL)
 301                 fdrop(fp, td);
 302 sctp_bad2:
 303         free(to, M_SONAME);
 304         return (error);
 305 }
 306
 307 int
 308 sys_sctp_generic_sendmsg_iov(struct thread *td, struct sctp_generic_sendmsg_iov_args *uap)
 309 {
 310         struct sctp_sndrcvinfo sinfo, *u_sinfo = NULL;
 311         struct socket *so;
 312         struct file *fp = NULL;
 313         struct sockaddr *to = NULL;
 314 #ifdef KTRACE
 315         struct uio *ktruio = NULL;
 316 #endif
 317         struct uio auio;
 318         struct iovec *iov, *tiov;
 319         cap_rights_t rights;
 320         ssize_t len;
 321         int error, i;
 322
 323         if (uap->sinfo != NULL) {
 324                 error = copyin(uap->sinfo, &sinfo, sizeof (sinfo));
 325                 if (error != 0)
 326                         return (error);
 327                 u_sinfo = &sinfo;
 328         }
 329         cap_rights_init_one(&rights, CAP_SEND);
 330         if (uap->tolen != 0) {
 331                 error = getsockaddr(&to, uap->to, uap->tolen);
 332                 if (error != 0) {
 333                         to = NULL;
 334                         goto sctp_bad2;
 335                 }
 336                 cap_rights_set_one(&rights, CAP_CONNECT);
 337         }
 338
 339         AUDIT_ARG_FD(uap->sd);
 340         error = getsock(td, uap->sd, &rights, &fp);
 341         if (error != 0)
 342                 goto sctp_bad1;
 343
 344 #ifdef COMPAT_FREEBSD32
 345         if (SV_CURPROC_FLAG(SV_ILP32))
 346                 error = freebsd32_copyiniov((struct iovec32 *)uap->iov,
 347                     uap->iovlen, &iov, EMSGSIZE);
 348         else
 349 #endif
 350                 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE);
 351         if (error != 0)
 352                 goto sctp_bad1;
 353 #ifdef KTRACE
 354         if (to && (KTRPOINT(td, KTR_STRUCT)))
 355                 ktrsockaddr(to);
 356 #endif
 357
 358         so = (struct socket *)fp->f_data;
 359         if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
 360                 error = EOPNOTSUPP;
 361                 goto sctp_bad;
 362         }
 363 #ifdef MAC
 364         error = mac_socket_check_send(td->td_ucred, so);
 365         if (error != 0)
 366                 goto sctp_bad;
 367 #endif /* MAC */
 368
 369         auio.uio_iov = iov;
 370         auio.uio_iovcnt = uap->iovlen;
 371         auio.uio_segflg = UIO_USERSPACE;
 372         auio.uio_rw = UIO_WRITE;
 373         auio.uio_td = td;
 374         auio.uio_offset = 0;                    /* XXX */
 375         auio.uio_resid = 0;
 376         tiov = iov;
 377         for (i = 0; i <uap->iovlen; i++, tiov++) {
 378                 if ((auio.uio_resid += tiov->iov_len) < 0) {
 379                         error = EINVAL;
 380                         goto sctp_bad;
 381                 }
 382         }
 383 #ifdef KTRACE
 384         if (KTRPOINT(td, KTR_GENIO))
 385                 ktruio = cloneuio(&auio);
 386 #endif /* KTRACE */
 387         len = auio.uio_resid;
 388         CURVNET_SET(so->so_vnet);
 389         error = sctp_lower_sosend(so, to, &auio,
 390                     (struct mbuf *)NULL, (struct mbuf *)NULL,
 391                     uap->flags, u_sinfo, td);
 392         CURVNET_RESTORE();
 393         if (error != 0) {
 394                 if (auio.uio_resid != len && (error == ERESTART ||
 395                     error == EINTR || error == EWOULDBLOCK))
 396                         error = 0;
 397                 /* Generation of SIGPIPE can be controlled per socket */
 398                 if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) &&
 399                     !(uap->flags & MSG_NOSIGNAL)) {
 400                         PROC_LOCK(td->td_proc);
 401                         tdsignal(td, SIGPIPE);
 402                         PROC_UNLOCK(td->td_proc);
 403                 }
 404         }
 405         if (error == 0)
 406                 td->td_retval[0] = len - auio.uio_resid;
 407 #ifdef KTRACE
 408         if (ktruio != NULL) {
 409                 if (error == 0)
 410                         ktruio->uio_resid = td->td_retval[0];
 411                 ktrgenio(uap->sd, UIO_WRITE, ktruio, error);
 412         }
 413 #endif /* KTRACE */
 414 sctp_bad:
 415         free(iov, M_IOV);
 416 sctp_bad1:
 417         if (fp != NULL)
 418                 fdrop(fp, td);
 419 sctp_bad2:
 420         free(to, M_SONAME);
 421         return (error);
 422 }
 423
 424 int
 425 sys_sctp_generic_recvmsg(struct thread *td, struct sctp_generic_recvmsg_args *uap)
 426 {
 427         uint8_t sockbufstore[256];
 428         struct uio auio;
 429         struct iovec *iov, *tiov;
 430         struct sctp_sndrcvinfo sinfo;
 431         struct socket *so;
 432         struct file *fp = NULL;
 433         struct sockaddr *fromsa;
 434         cap_rights_t rights;
 435 #ifdef KTRACE
 436         struct uio *ktruio = NULL;
 437 #endif
 438         ssize_t len;
 439         int error, fromlen, i, msg_flags;
 440
 441         AUDIT_ARG_FD(uap->sd);
 442         error = getsock(td, uap->sd, cap_rights_init_one(&rights, CAP_RECV),
 443             &fp);
 444         if (error != 0)
 445                 return (error);
 446 #ifdef COMPAT_FREEBSD32
 447         if (SV_CURPROC_FLAG(SV_ILP32))
 448                 error = freebsd32_copyiniov((struct iovec32 *)uap->iov,
 449                     uap->iovlen, &iov, EMSGSIZE);
 450         else
 451 #endif
 452                 error = copyiniov(uap->iov, uap->iovlen, &iov, EMSGSIZE);
 453         if (error != 0)
 454                 goto out1;
 455
 456         so = fp->f_data;
 457         if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
 458                 error = EOPNOTSUPP;
 459                 goto out;
 460         }
 461 #ifdef MAC
 462         error = mac_socket_check_receive(td->td_ucred, so);
 463         if (error != 0)
 464                 goto out;
 465 #endif /* MAC */
 466
 467         if (uap->fromlenaddr != NULL) {
 468                 error = copyin(uap->fromlenaddr, &fromlen, sizeof (fromlen));
 469                 if (error != 0)
 470                         goto out;
 471         } else {
 472                 fromlen = 0;
 473         }
 474         if (uap->msg_flags) {
 475                 error = copyin(uap->msg_flags, &msg_flags, sizeof (int));
 476                 if (error != 0)
 477                         goto out;
 478         } else {
 479                 msg_flags = 0;
 480         }
 481         auio.uio_iov = iov;
 482         auio.uio_iovcnt = uap->iovlen;
 483         auio.uio_segflg = UIO_USERSPACE;
 484         auio.uio_rw = UIO_READ;
 485         auio.uio_td = td;
 486         auio.uio_offset = 0;                    /* XXX */
 487         auio.uio_resid = 0;
 488         tiov = iov;
 489         for (i = 0; i <uap->iovlen; i++, tiov++) {
 490                 if ((auio.uio_resid += tiov->iov_len) < 0) {
 491                         error = EINVAL;
 492                         goto out;
 493                 }
 494         }
 495         len = auio.uio_resid;
 496         fromsa = (struct sockaddr *)sockbufstore;
 497
 498 #ifdef KTRACE
 499         if (KTRPOINT(td, KTR_GENIO))
 500                 ktruio = cloneuio(&auio);
 501 #endif /* KTRACE */
 502         memset(&sinfo, 0, sizeof(struct sctp_sndrcvinfo));
 503         CURVNET_SET(so->so_vnet);
 504         error = sctp_sorecvmsg(so, &auio, (struct mbuf **)NULL,
 505                     fromsa, fromlen, &msg_flags,
 506                     (struct sctp_sndrcvinfo *)&sinfo, 1);
 507         CURVNET_RESTORE();
 508         if (error != 0) {
 509                 if (auio.uio_resid != len && (error == ERESTART ||
 510                     error == EINTR || error == EWOULDBLOCK))
 511                         error = 0;
 512         } else {
 513                 if (uap->sinfo)
 514                         error = copyout(&sinfo, uap->sinfo, sizeof (sinfo));
 515         }
 516 #ifdef KTRACE
 517         if (ktruio != NULL) {
 518                 ktruio->uio_resid = len - auio.uio_resid;
 519                 ktrgenio(uap->sd, UIO_READ, ktruio, error);
 520         }
 521 #endif /* KTRACE */
 522         if (error != 0)
 523                 goto out;
 524         td->td_retval[0] = len - auio.uio_resid;
 525
 526         if (fromlen && uap->from) {
 527                 len = fromlen;
 528                 if (len <= 0 || fromsa == NULL)
 529                         len = 0;
 530                 else {
 531                         len = MIN(len, fromsa->sa_len);
 532                         error = copyout(fromsa, uap->from, (size_t)len);
 533                         if (error != 0)
 534                                 goto out;
 535                 }
 536                 error = copyout(&len, uap->fromlenaddr, sizeof (socklen_t));
 537                 if (error != 0)
 538                         goto out;
 539         }
 540 #ifdef KTRACE
 541         if (KTRPOINT(td, KTR_STRUCT))
 542                 ktrsockaddr(fromsa);
 543 #endif
 544         if (uap->msg_flags) {
 545                 error = copyout(&msg_flags, uap->msg_flags, sizeof (int));
 546                 if (error != 0)
 547                         goto out;
 548         }
 549 out:
 550         free(iov, M_IOV);
 551 out1:
 552         if (fp != NULL)
 553                 fdrop(fp, td);
 554
 555         return (error);
 556 }