bsd/net/raw_usrreq.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, 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()
  85 {
  86         raw_mtx_grp_attr = lck_grp_attr_alloc_init();
  87
  88         lck_grp_attr_setdefault(raw_mtx_grp_attr);
  89
  90         raw_mtx_grp = lck_grp_alloc_init("rawcb", raw_mtx_grp_attr);
  91
  92         raw_mtx_attr = lck_attr_alloc_init();
  93
  94         lck_attr_setdefault(raw_mtx_attr);
  95
  96         if ((raw_mtx = lck_mtx_alloc_init(raw_mtx_grp, raw_mtx_attr)) == NULL) {
  97                 printf("raw_init: can't alloc raw_mtx\n");
  98                 return;
  99         }
 100         LIST_INIT(&rawcb_list);
 101 }
 102
 103
 104 /*
 105  * Raw protocol input routine.  Find the socket
 106  * associated with the packet(s) and move them over.  If
 107  * nothing exists for this packet, drop it.
 108  */
 109 /*
 110  * Raw protocol interface.
 111  */
 112 void
 113 raw_input(m0, proto, src, dst)
 114         struct mbuf *m0;
 115         register struct sockproto *proto;
 116         struct sockaddr *src, *dst;
 117 {
 118         register struct rawcb *rp;
 119         register struct mbuf *m = m0;
 120         register int sockets = 0;
 121         struct socket *last;
 122         int error;
 123
 124 //####LD raw_input is called from many places, input & output path. We have to assume the
 125 //####LD socket we'll find and need to append to is unlocked.
 126 //####LD calls from the output (locked) path need to make sure the socket is not locked when
 127 //####LD we call in raw_input
 128         last = 0;
 129         lck_mtx_lock(raw_mtx);
 130         LIST_FOREACH(rp, &rawcb_list, list) {
 131                 if (rp->rcb_proto.sp_family != proto->sp_family)
 132                         continue;
 133                 if (rp->rcb_proto.sp_protocol  &&
 134                     rp->rcb_proto.sp_protocol != proto->sp_protocol)
 135                         continue;
 136                 /*
 137                  * We assume the lower level routines have
 138                  * placed the address in a canonical format
 139                  * suitable for a structure comparison.
 140                  *
 141                  * Note that if the lengths are not the same
 142                  * the comparison will fail at the first byte.
 143                  */
 144 #define equal(a1, a2) \
 145   (bcmp((caddr_t)(a1), (caddr_t)(a2), a1->sa_len) == 0)
 146                 if (rp->rcb_laddr && !equal(rp->rcb_laddr, dst))
 147                         continue;
 148                 if (rp->rcb_faddr && !equal(rp->rcb_faddr, src))
 149                         continue;
 150                 if (last) {
 151                         struct mbuf *n;
 152                         n = m_copy(m, 0, (int)M_COPYALL);
 153                         if (n) {
 154                                 socket_lock(last, 1);
 155                                 if (sbappendaddr(&last->so_rcv, src,
 156                                     n, (struct mbuf *)0, &error) != 0) {
 157                                         sorwakeup(last);
 158                                         sockets++;
 159                                 }
 160                                 socket_unlock(last, 1);
 161                         }
 162                 }
 163                 last = rp->rcb_socket;
 164         }
 165         if (last) {
 166                 socket_lock(last, 1);
 167                 if (sbappendaddr(&last->so_rcv, src,
 168                     m, (struct mbuf *)0, &error) != 0) {
 169                         sorwakeup(last);
 170                         sockets++;
 171                 }
 172                 socket_unlock(last, 1);
 173         } else
 174                 m_freem(m);
 175         lck_mtx_unlock(raw_mtx);
 176 }
 177
 178 /*ARGSUSED*/
 179 void
 180 raw_ctlinput(cmd, arg, dummy)
 181         int cmd;
 182         struct sockaddr *arg;
 183         void *dummy;
 184 {
 185
 186         if (cmd < 0 || cmd > PRC_NCMDS)
 187                 return;
 188         /* INCOMPLETE */
 189 }
 190
 191 static int
 192 raw_uabort(struct socket *so)
 193 {
 194         struct rawcb *rp = sotorawcb(so);
 195
 196         lck_mtx_t * mutex_held;
 197         if (so->so_proto->pr_getlock != NULL)
 198                 mutex_held = (*so->so_proto->pr_getlock)(so, 0);
 199         else
 200                 mutex_held = so->so_proto->pr_domain->dom_mtx;
 201         lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
 202
 203         if (rp == 0)
 204                 return EINVAL;
 205         raw_disconnect(rp);
 206         sofree(so);
 207         soisdisconnected(so);
 208         return 0;
 209 }
 210
 211 /* pru_accept is EOPNOTSUPP */
 212
 213 static int
 214 raw_uattach(struct socket *so, int proto, struct proc *p)
 215 {
 216         struct rawcb *rp = sotorawcb(so);
 217 #ifndef __APPLE__
 218         int error;
 219 #endif
 220
 221         if (rp == 0)
 222                 return EINVAL;
 223 #ifdef __APPLE__
 224                 if ((so->so_state & SS_PRIV) == 0)
 225                         return (EPERM);
 226 #else
 227         if (p && (error = suser(p)) != 0)
 228                 return error;
 229 #endif
 230         return raw_attach(so, proto);
 231 }
 232
 233 static int
 234 raw_ubind(struct socket *so, struct sockaddr *nam, struct proc *p)
 235 {
 236         return EINVAL;
 237 }
 238
 239 static int
 240 raw_uconnect(struct socket *so, struct sockaddr *nam, struct proc *p)
 241 {
 242         return EINVAL;
 243 }
 244
 245 /* pru_connect2 is EOPNOTSUPP */
 246 /* pru_control is EOPNOTSUPP */
 247
 248 static int
 249 raw_udetach(struct socket *so)
 250 {
 251         struct rawcb *rp = sotorawcb(so);
 252
 253         lck_mtx_t * mutex_held;
 254         if (so->so_proto->pr_getlock != NULL)
 255                 mutex_held = (*so->so_proto->pr_getlock)(so, 0);
 256         else
 257                 mutex_held = so->so_proto->pr_domain->dom_mtx;
 258         lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
 259         if (rp == 0)
 260                 return EINVAL;
 261
 262         raw_detach(rp);
 263         return 0;
 264 }
 265
 266 static int
 267 raw_udisconnect(struct socket *so)
 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         raw_disconnect(rp);
 277         soisdisconnected(so);
 278         return 0;
 279 }
 280
 281 /* pru_listen is EOPNOTSUPP */
 282
 283 static int
 284 raw_upeeraddr(struct socket *so, struct sockaddr **nam)
 285 {
 286         struct rawcb *rp = sotorawcb(so);
 287
 288         if (rp == 0)
 289                 return EINVAL;
 290         if (rp->rcb_faddr == 0) {
 291                 return ENOTCONN;
 292         }
 293         *nam = dup_sockaddr(rp->rcb_faddr, 1);
 294         return 0;
 295 }
 296
 297 /* pru_rcvd is EOPNOTSUPP */
 298 /* pru_rcvoob is EOPNOTSUPP */
 299
 300 static int
 301 raw_usend(struct socket *so, int flags, struct mbuf *m,
 302           struct sockaddr *nam, struct mbuf *control, struct proc *p)
 303 {
 304         int error;
 305         struct rawcb *rp = sotorawcb(so);
 306
 307         lck_mtx_t * mutex_held;
 308         if (so->so_proto->pr_getlock != NULL)
 309                 mutex_held = (*so->so_proto->pr_getlock)(so, 0);
 310         else
 311                 mutex_held = so->so_proto->pr_domain->dom_mtx;
 312         lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
 313
 314         if (rp == 0) {
 315                 error = EINVAL;
 316                 goto release;
 317         }
 318
 319         if (flags & PRUS_OOB) {
 320                 error = EOPNOTSUPP;
 321                 goto release;
 322         }
 323
 324         if (control && control->m_len) {
 325                 error = EOPNOTSUPP;
 326                 goto release;
 327         }
 328         if (nam) {
 329                 if (rp->rcb_faddr) {
 330                         error = EISCONN;
 331                         goto release;
 332                 }
 333                 rp->rcb_faddr = nam;
 334         } else if (rp->rcb_faddr == 0) {
 335                 error = ENOTCONN;
 336                 goto release;
 337         }
 338         error = (*so->so_proto->pr_output)(m, so);
 339         m = NULL;
 340         if (nam)
 341                 rp->rcb_faddr = 0;
 342 release:
 343         if (m != NULL)
 344                 m_freem(m);
 345         return (error);
 346 }
 347
 348 /* pru_sense is null */
 349
 350 static int
 351 raw_ushutdown(struct socket *so)
 352 {
 353         struct rawcb *rp = sotorawcb(so);
 354         lck_mtx_t * mutex_held;
 355         if (so->so_proto->pr_getlock != NULL)
 356                 mutex_held = (*so->so_proto->pr_getlock)(so, 0);
 357         else
 358                 mutex_held = so->so_proto->pr_domain->dom_mtx;
 359         lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
 360
 361         if (rp == 0)
 362                 return EINVAL;
 363         socantsendmore(so);
 364         return 0;
 365 }
 366
 367 static int
 368 raw_usockaddr(struct socket *so, struct sockaddr **nam)
 369 {
 370         struct rawcb *rp = sotorawcb(so);
 371
 372         if (rp == 0)
 373                 return EINVAL;
 374         if (rp->rcb_laddr == 0)
 375                 return EINVAL;
 376         *nam = dup_sockaddr(rp->rcb_laddr, 1);
 377         return 0;
 378 }
 379
 380 struct pr_usrreqs raw_usrreqs = {
 381         raw_uabort, pru_accept_notsupp, raw_uattach, raw_ubind, raw_uconnect,
 382         pru_connect2_notsupp, pru_control_notsupp, raw_udetach,
 383         raw_udisconnect, pru_listen_notsupp, raw_upeeraddr, pru_rcvd_notsupp,
 384         pru_rcvoob_notsupp, raw_usend, pru_sense_null, raw_ushutdown,
 385         raw_usockaddr, sosend, soreceive, pru_sopoll_notsupp
 386 };