bsd/net/raw_usrreq.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * Copyright (c) 1980, 1986, 1993
  32  *      The Regents of the University of California.  All rights reserved.
  33  *
  34  * Redistribution and use in source and binary forms, with or without
  35  * modification, are permitted provided that the following conditions
  36  * are met:
  37  * 1. Redistributions of source code must retain the above copyright
  38  *    notice, this list of conditions and the following disclaimer.
  39  * 2. Redistributions in binary form must reproduce the above copyright
  40  *    notice, this list of conditions and the following disclaimer in the
  41  *    documentation and/or other materials provided with the distribution.
  42  * 3. All advertising materials mentioning features or use of this software
  43  *    must display the following acknowledgement:
  44  *      This product includes software developed by the University of
  45  *      California, Berkeley and its contributors.
  46  * 4. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  *
  62  *      @(#)raw_usrreq.c        8.1 (Berkeley) 6/10/93
  63  * $FreeBSD: src/sys/net/raw_usrreq.c,v 1.18 1999/08/28 00:48:28 peter Exp $
  64  */
  65
  66 #include <sys/param.h>
  67 #include <sys/systm.h>
  68 #include <sys/mbuf.h>
  69 #include <sys/proc.h>
  70 #include <sys/domain.h>
  71 #include <sys/protosw.h>
  72 #include <sys/socket.h>
  73 #include <sys/socketvar.h>
  74 #include <kern/locks.h>
  75
  76 #include <net/raw_cb.h>
  77
  78 lck_mtx_t       *raw_mtx;       /*### global raw cb mutex for now */
  79 lck_attr_t      *raw_mtx_attr;
  80 lck_grp_t       *raw_mtx_grp;
  81 lck_grp_attr_t  *raw_mtx_grp_attr;
  82 /*
  83  * Initialize raw connection block q.
  84  */
  85 void
  86 raw_init()
  87 {
  88         raw_mtx_grp_attr = lck_grp_attr_alloc_init();
  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         if ((raw_mtx = lck_mtx_alloc_init(raw_mtx_grp, raw_mtx_attr)) == NULL) {
  95                 printf("raw_init: can't alloc raw_mtx\n");
  96                 return;
  97         }
  98         LIST_INIT(&rawcb_list);
  99 }
 100
 101
 102 /*
 103  * Raw protocol input routine.  Find the socket
 104  * associated with the packet(s) and move them over.  If
 105  * nothing exists for this packet, drop it.
 106  */
 107 /*
 108  * Raw protocol interface.
 109  */
 110 void
 111 raw_input(m0, proto, src, dst)
 112         struct mbuf *m0;
 113         register struct sockproto *proto;
 114         struct sockaddr *src, *dst;
 115 {
 116         register struct rawcb *rp;
 117         register struct mbuf *m = m0;
 118         register int sockets = 0;
 119         struct socket *last;
 120         int error;
 121
 122 //####LD raw_input is called from many places, input & output path. We have to assume the
 123 //####LD socket we'll find and need to append to is unlocked.
 124 //####LD calls from the output (locked) path need to make sure the socket is not locked when
 125 //####LD we call in raw_input
 126         last = 0;
 127         lck_mtx_lock(raw_mtx);
 128         LIST_FOREACH(rp, &rawcb_list, list) {
 129                 if (rp->rcb_proto.sp_family != proto->sp_family)
 130                         continue;
 131                 if (rp->rcb_proto.sp_protocol  &&
 132                     rp->rcb_proto.sp_protocol != proto->sp_protocol)
 133                         continue;
 134                 /*
 135                  * We assume the lower level routines have
 136                  * placed the address in a canonical format
 137                  * suitable for a structure comparison.
 138                  *
 139                  * Note that if the lengths are not the same
 140                  * the comparison will fail at the first byte.
 141                  */
 142 #define equal(a1, a2) \
 143   (bcmp((caddr_t)(a1), (caddr_t)(a2), a1->sa_len) == 0)
 144                 if (rp->rcb_laddr && !equal(rp->rcb_laddr, dst))
 145                         continue;
 146                 if (rp->rcb_faddr && !equal(rp->rcb_faddr, src))
 147                         continue;
 148                 if (last) {
 149                         struct mbuf *n;
 150                         n = m_copy(m, 0, (int)M_COPYALL);
 151                         if (n) {
 152                                 socket_lock(last, 1);
 153                                 if (sbappendaddr(&last->so_rcv, src,
 154                                     n, (struct mbuf *)0, &error) != 0) {
 155                                         sorwakeup(last);
 156                                         sockets++;
 157                                 }
 158                                 socket_unlock(last, 1);
 159                         }
 160                 }
 161                 last = rp->rcb_socket;
 162         }
 163         if (last) {
 164                 socket_lock(last, 1);
 165                 if (sbappendaddr(&last->so_rcv, src,
 166                     m, (struct mbuf *)0, &error) != 0) {
 167                         sorwakeup(last);
 168                         sockets++;
 169                 }
 170                 socket_unlock(last, 1);
 171         } else
 172                 m_freem(m);
 173         lck_mtx_unlock(raw_mtx);
 174 }
 175
 176 /*ARGSUSED*/
 177 void
 178 raw_ctlinput(cmd, arg, dummy)
 179         int cmd;
 180         struct sockaddr *arg;
 181         void *dummy;
 182 {
 183
 184         if (cmd < 0 || cmd > PRC_NCMDS)
 185                 return;
 186         /* INCOMPLETE */
 187 }
 188
 189 static int
 190 raw_uabort(struct socket *so)
 191 {
 192         struct rawcb *rp = sotorawcb(so);
 193
 194         lck_mtx_t * mutex_held;
 195         if (so->so_proto->pr_getlock != NULL)
 196                 mutex_held = (*so->so_proto->pr_getlock)(so, 0);
 197         else
 198                 mutex_held = so->so_proto->pr_domain->dom_mtx;
 199         lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
 200
 201         if (rp == 0)
 202                 return EINVAL;
 203         raw_disconnect(rp);
 204         sofree(so);
 205         soisdisconnected(so);
 206         return 0;
 207 }
 208
 209 /* pru_accept is EOPNOTSUPP */
 210
 211 static int
 212 raw_uattach(struct socket *so, int proto, struct proc *p)
 213 {
 214         struct rawcb *rp = sotorawcb(so);
 215 #ifndef __APPLE__
 216         int error;
 217 #endif
 218
 219         if (rp == 0)
 220                 return EINVAL;
 221 #ifdef __APPLE__
 222                 if ((so->so_state & SS_PRIV) == 0)
 223                         return (EPERM);
 224 #else
 225         if (p && (error = suser(p)) != 0)
 226                 return error;
 227 #endif
 228         return raw_attach(so, proto);
 229 }
 230
 231 static int
 232 raw_ubind(struct socket *so, struct sockaddr *nam, struct proc *p)
 233 {
 234         return EINVAL;
 235 }
 236
 237 static int
 238 raw_uconnect(struct socket *so, struct sockaddr *nam, struct proc *p)
 239 {
 240         return EINVAL;
 241 }
 242
 243 /* pru_connect2 is EOPNOTSUPP */
 244 /* pru_control is EOPNOTSUPP */
 245
 246 static int
 247 raw_udetach(struct socket *so)
 248 {
 249         struct rawcb *rp = sotorawcb(so);
 250
 251         lck_mtx_t * mutex_held;
 252         if (so->so_proto->pr_getlock != NULL)
 253                 mutex_held = (*so->so_proto->pr_getlock)(so, 0);
 254         else
 255                 mutex_held = so->so_proto->pr_domain->dom_mtx;
 256         lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
 257         if (rp == 0)
 258                 return EINVAL;
 259
 260         raw_detach(rp);
 261         return 0;
 262 }
 263
 264 static int
 265 raw_udisconnect(struct socket *so)
 266 {
 267         struct rawcb *rp = sotorawcb(so);
 268
 269         if (rp == 0)
 270                 return EINVAL;
 271         if (rp->rcb_faddr == 0) {
 272                 return ENOTCONN;
 273         }
 274         raw_disconnect(rp);
 275         soisdisconnected(so);
 276         return 0;
 277 }
 278
 279 /* pru_listen is EOPNOTSUPP */
 280
 281 static int
 282 raw_upeeraddr(struct socket *so, struct sockaddr **nam)
 283 {
 284         struct rawcb *rp = sotorawcb(so);
 285
 286         if (rp == 0)
 287                 return EINVAL;
 288         if (rp->rcb_faddr == 0) {
 289                 return ENOTCONN;
 290         }
 291         *nam = dup_sockaddr(rp->rcb_faddr, 1);
 292         return 0;
 293 }
 294
 295 /* pru_rcvd is EOPNOTSUPP */
 296 /* pru_rcvoob is EOPNOTSUPP */
 297
 298 static int
 299 raw_usend(struct socket *so, int flags, struct mbuf *m,
 300           struct sockaddr *nam, struct mbuf *control, struct proc *p)
 301 {
 302         int error;
 303         struct rawcb *rp = sotorawcb(so);
 304
 305         lck_mtx_t * mutex_held;
 306         if (so->so_proto->pr_getlock != NULL)
 307                 mutex_held = (*so->so_proto->pr_getlock)(so, 0);
 308         else
 309                 mutex_held = so->so_proto->pr_domain->dom_mtx;
 310         lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
 311
 312         if (rp == 0) {
 313                 error = EINVAL;
 314                 goto release;
 315         }
 316
 317         if (flags & PRUS_OOB) {
 318                 error = EOPNOTSUPP;
 319                 goto release;
 320         }
 321
 322         if (control && control->m_len) {
 323                 error = EOPNOTSUPP;
 324                 goto release;
 325         }
 326         if (nam) {
 327                 if (rp->rcb_faddr) {
 328                         error = EISCONN;
 329                         goto release;
 330                 }
 331                 rp->rcb_faddr = nam;
 332         } else if (rp->rcb_faddr == 0) {
 333                 error = ENOTCONN;
 334                 goto release;
 335         }
 336         error = (*so->so_proto->pr_output)(m, so);
 337         m = NULL;
 338         if (nam)
 339                 rp->rcb_faddr = 0;
 340 release:
 341         if (m != NULL)
 342                 m_freem(m);
 343         return (error);
 344 }
 345
 346 /* pru_sense is null */
 347
 348 static int
 349 raw_ushutdown(struct socket *so)
 350 {
 351         struct rawcb *rp = sotorawcb(so);
 352         lck_mtx_t * mutex_held;
 353         if (so->so_proto->pr_getlock != NULL)
 354                 mutex_held = (*so->so_proto->pr_getlock)(so, 0);
 355         else
 356                 mutex_held = so->so_proto->pr_domain->dom_mtx;
 357         lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
 358
 359         if (rp == 0)
 360                 return EINVAL;
 361         socantsendmore(so);
 362         return 0;
 363 }
 364
 365 static int
 366 raw_usockaddr(struct socket *so, struct sockaddr **nam)
 367 {
 368         struct rawcb *rp = sotorawcb(so);
 369
 370         if (rp == 0)
 371                 return EINVAL;
 372         if (rp->rcb_laddr == 0)
 373                 return EINVAL;
 374         *nam = dup_sockaddr(rp->rcb_laddr, 1);
 375         return 0;
 376 }
 377
 378 struct pr_usrreqs raw_usrreqs = {
 379         raw_uabort, pru_accept_notsupp, raw_uattach, raw_ubind, raw_uconnect,
 380         pru_connect2_notsupp, pru_control_notsupp, raw_udetach,
 381         raw_udisconnect, pru_listen_notsupp, raw_upeeraddr, pru_rcvd_notsupp,
 382         pru_rcvoob_notsupp, raw_usend, pru_sense_null, raw_ushutdown,
 383         raw_usockaddr, sosend, soreceive, pru_sopoll_notsupp
 384 };