bsd/net/raw_usrreq.c

   1 /*
   2  * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright (c) 1980, 1986, 1993
  30  *      The Regents of the University of California.  All rights reserved.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      @(#)raw_usrreq.c        8.1 (Berkeley) 6/10/93
  61  * $FreeBSD: src/sys/net/raw_usrreq.c,v 1.18 1999/08/28 00:48:28 peter Exp $
  62  */
  63
  64 #include <sys/param.h>
  65 #include <sys/systm.h>
  66 #include <sys/mbuf.h>
  67 #include <sys/proc.h>
  68 #include <sys/domain.h>
  69 #include <sys/protosw.h>
  70 #include <sys/socket.h>
  71 #include <sys/socketvar.h>
  72 #include <kern/locks.h>
  73
  74 #include <net/raw_cb.h>
  75
  76 lck_mtx_t       *raw_mtx;       /*### global raw cb mutex for now */
  77 lck_attr_t      *raw_mtx_attr;
  78 lck_grp_t       *raw_mtx_grp;
  79 lck_grp_attr_t  *raw_mtx_grp_attr;
  80 /*
  81  * Initialize raw connection block q.
  82  */
  83 void
  84 raw_init(void)
  85 {
  86         raw_mtx_grp_attr = lck_grp_attr_alloc_init();
  87
  88         raw_mtx_grp = lck_grp_alloc_init("rawcb", raw_mtx_grp_attr);
  89
  90         raw_mtx_attr = lck_attr_alloc_init();
  91
  92         if ((raw_mtx = lck_mtx_alloc_init(raw_mtx_grp, raw_mtx_attr)) == NULL) {
  93                 printf("raw_init: can't alloc raw_mtx\n");
  94                 return;
  95         }
  96         LIST_INIT(&rawcb_list);
  97 }
  98
  99
 100 /*
 101  * Raw protocol input routine.  Find the socket
 102  * associated with the packet(s) and move them over.  If
 103  * nothing exists for this packet, drop it.
 104  */
 105 /*
 106  * Raw protocol interface.
 107  */
 108 void
 109 raw_input(struct mbuf *m0, struct sockproto *proto, struct sockaddr *src,
 110           struct sockaddr *dst)
 111 {
 112         struct rawcb *rp;
 113         struct mbuf *m = m0;
 114         int sockets = 0;
 115         struct socket *last;
 116         int error;
 117
 118 //####LD raw_input is called from many places, input & output path. We have to assume the
 119 //####LD socket we'll find and need to append to is unlocked.
 120 //####LD calls from the output (locked) path need to make sure the socket is not locked when
 121 //####LD we call in raw_input
 122         last = NULL;
 123         lck_mtx_lock(raw_mtx);
 124         LIST_FOREACH(rp, &rawcb_list, list) {
 125                 if (rp->rcb_proto.sp_family != proto->sp_family)
 126                         continue;
 127                 if (rp->rcb_proto.sp_protocol  &&
 128                     rp->rcb_proto.sp_protocol != proto->sp_protocol)
 129                         continue;
 130                 /*
 131                  * We assume the lower level routines have
 132                  * placed the address in a canonical format
 133                  * suitable for a structure comparison.
 134                  *
 135                  * Note that if the lengths are not the same
 136                  * the comparison will fail at the first byte.
 137                  */
 138 #define equal(a1, a2) \
 139   (bcmp((caddr_t)(a1), (caddr_t)(a2), a1->sa_len) == 0)
 140                 if (rp->rcb_laddr && !equal(rp->rcb_laddr, dst))
 141                         continue;
 142                 if (rp->rcb_faddr && !equal(rp->rcb_faddr, src))
 143                         continue;
 144                 if (last) {
 145                         struct mbuf *n;
 146                         n = m_copy(m, 0, (int)M_COPYALL);
 147                         if (n) {
 148                                 socket_lock(last, 1);
 149                                 if (sbappendaddr(&last->so_rcv, src,
 150                                     n, (struct mbuf *)0, &error) != 0) {
 151                                         sorwakeup(last);
 152                                         sockets++;
 153                                 }
 154                                 socket_unlock(last, 1);
 155                         }
 156                 }
 157                 last = rp->rcb_socket;
 158         }
 159         if (last) {
 160                 socket_lock(last, 1);
 161                 if (sbappendaddr(&last->so_rcv, src,
 162                     m, (struct mbuf *)0, &error) != 0) {
 163                         sorwakeup(last);
 164                         sockets++;
 165                 }
 166                 socket_unlock(last, 1);
 167         } else
 168                 m_freem(m);
 169         lck_mtx_unlock(raw_mtx);
 170 }
 171
 172 /*ARGSUSED*/
 173 void
 174 raw_ctlinput(int cmd, __unused struct sockaddr *arg, __unused void *dummy)
 175 {
 176
 177         if (cmd < 0 || cmd > PRC_NCMDS)
 178                 return;
 179         /* INCOMPLETE */
 180 }
 181
 182 static int
 183 raw_uabort(struct socket *so)
 184 {
 185         struct rawcb *rp = sotorawcb(so);
 186
 187         lck_mtx_t * mutex_held;
 188         if (so->so_proto->pr_getlock != NULL)
 189                 mutex_held = (*so->so_proto->pr_getlock)(so, 0);
 190         else
 191                 mutex_held = so->so_proto->pr_domain->dom_mtx;
 192         lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
 193
 194         if (rp == 0)
 195                 return EINVAL;
 196         raw_disconnect(rp);
 197         sofree(so);
 198         soisdisconnected(so);
 199         return 0;
 200 }
 201
 202 /* pru_accept is EOPNOTSUPP */
 203
 204 static int
 205 raw_uattach(struct socket *so, int proto, __unused struct proc *p)
 206 {
 207         struct rawcb *rp = sotorawcb(so);
 208
 209         if (rp == 0)
 210                 return EINVAL;
 211                 if ((so->so_state & SS_PRIV) == 0)
 212                         return (EPERM);
 213         return raw_attach(so, proto);
 214 }
 215
 216 static int
 217 raw_ubind(__unused struct socket *so, __unused struct sockaddr *nam, __unused struct proc *p)
 218 {
 219         return EINVAL;
 220 }
 221
 222 static int
 223 raw_uconnect(__unused struct socket *so, __unused struct sockaddr *nam, __unused struct proc *p)
 224 {
 225         return EINVAL;
 226 }
 227
 228 /* pru_connect2 is EOPNOTSUPP */
 229 /* pru_control is EOPNOTSUPP */
 230
 231 static int
 232 raw_udetach(struct socket *so)
 233 {
 234         struct rawcb *rp = sotorawcb(so);
 235
 236         lck_mtx_t * mutex_held;
 237         if (so->so_proto->pr_getlock != NULL)
 238                 mutex_held = (*so->so_proto->pr_getlock)(so, 0);
 239         else
 240                 mutex_held = so->so_proto->pr_domain->dom_mtx;
 241         lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
 242         if (rp == 0)
 243                 return EINVAL;
 244
 245         raw_detach(rp);
 246         return 0;
 247 }
 248
 249 static int
 250 raw_udisconnect(struct socket *so)
 251 {
 252         struct rawcb *rp = sotorawcb(so);
 253
 254         if (rp == 0)
 255                 return EINVAL;
 256         if (rp->rcb_faddr == 0) {
 257                 return ENOTCONN;
 258         }
 259         raw_disconnect(rp);
 260         soisdisconnected(so);
 261         return 0;
 262 }
 263
 264 /* pru_listen is EOPNOTSUPP */
 265
 266 static int
 267 raw_upeeraddr(struct socket *so, struct sockaddr **nam)
 268 {
 269         struct rawcb *rp = sotorawcb(so);
 270
 271         if (rp == 0)
 272                 return EINVAL;
 273         if (rp->rcb_faddr == 0) {
 274                 return ENOTCONN;
 275         }
 276         *nam = dup_sockaddr(rp->rcb_faddr, 1);
 277         return 0;
 278 }
 279
 280 /* pru_rcvd is EOPNOTSUPP */
 281 /* pru_rcvoob is EOPNOTSUPP */
 282
 283 static int
 284 raw_usend(struct socket *so, int flags, struct mbuf *m,
 285           struct sockaddr *nam, struct mbuf *control, __unused struct proc *p)
 286 {
 287         int error;
 288         struct rawcb *rp = sotorawcb(so);
 289
 290         lck_mtx_t * mutex_held;
 291         if (so->so_proto->pr_getlock != NULL)
 292                 mutex_held = (*so->so_proto->pr_getlock)(so, 0);
 293         else
 294                 mutex_held = so->so_proto->pr_domain->dom_mtx;
 295         lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
 296
 297         if (rp == 0) {
 298                 error = EINVAL;
 299                 goto release;
 300         }
 301
 302         if (flags & PRUS_OOB) {
 303                 error = EOPNOTSUPP;
 304                 goto release;
 305         }
 306
 307         if (so->so_proto->pr_output == NULL) {
 308                 error = EOPNOTSUPP;
 309                 goto release;
 310         }
 311
 312         if (control && control->m_len) {
 313                 error = EOPNOTSUPP;
 314                 goto release;
 315         }
 316         if (nam) {
 317                 if (rp->rcb_faddr) {
 318                         error = EISCONN;
 319                         goto release;
 320                 }
 321                 rp->rcb_faddr = nam;
 322         } else if (rp->rcb_faddr == 0) {
 323                 error = ENOTCONN;
 324                 goto release;
 325         }
 326         error = (*so->so_proto->pr_output)(m, so);
 327         m = NULL;
 328         if (nam)
 329                 rp->rcb_faddr = NULL;
 330 release:
 331         if (m != NULL)
 332                 m_freem(m);
 333         return (error);
 334 }
 335
 336 /* pru_sense is null */
 337
 338 static int
 339 raw_ushutdown(struct socket *so)
 340 {
 341         struct rawcb *rp = sotorawcb(so);
 342         lck_mtx_t * mutex_held;
 343         if (so->so_proto->pr_getlock != NULL)
 344                 mutex_held = (*so->so_proto->pr_getlock)(so, 0);
 345         else
 346                 mutex_held = so->so_proto->pr_domain->dom_mtx;
 347         lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
 348
 349         if (rp == 0)
 350                 return EINVAL;
 351         socantsendmore(so);
 352         return 0;
 353 }
 354
 355 static int
 356 raw_usockaddr(struct socket *so, struct sockaddr **nam)
 357 {
 358         struct rawcb *rp = sotorawcb(so);
 359
 360         if (rp == 0)
 361                 return EINVAL;
 362         if (rp->rcb_laddr == 0)
 363                 return EINVAL;
 364         *nam = dup_sockaddr(rp->rcb_laddr, 1);
 365         return 0;
 366 }
 367
 368 struct pr_usrreqs raw_usrreqs = {
 369         raw_uabort, pru_accept_notsupp, raw_uattach, raw_ubind, raw_uconnect,
 370         pru_connect2_notsupp, pru_control_notsupp, raw_udetach,
 371         raw_udisconnect, pru_listen_notsupp, raw_upeeraddr, pru_rcvd_notsupp,
 372         pru_rcvoob_notsupp, raw_usend, pru_sense_null, raw_ushutdown,
 373         raw_usockaddr, sosend, soreceive, pru_sopoll_notsupp
 374 };