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 decl_lck_mtx_data(,raw_mtx_data);       /*### global raw cb mutex for now */
  77 lck_mtx_t       *raw_mtx = &raw_mtx_data;
  78 lck_attr_t      *raw_mtx_attr;
  79 lck_grp_t       *raw_mtx_grp;
  80 lck_grp_attr_t  *raw_mtx_grp_attr;
  81 /*
  82  * Initialize raw connection block q.
  83  */
  84 void
  85 raw_init(void)
  86 {
  87         raw_mtx_grp_attr = lck_grp_attr_alloc_init();
  88
  89         raw_mtx_grp = lck_grp_alloc_init("rawcb", raw_mtx_grp_attr);
  90
  91         raw_mtx_attr = lck_attr_alloc_init();
  92
  93         lck_mtx_init(raw_mtx, raw_mtx_grp, raw_mtx_attr);
  94         LIST_INIT(&rawcb_list);
  95 }
  96
  97
  98 /*
  99  * Raw protocol input routine.  Find the socket
 100  * associated with the packet(s) and move them over.  If
 101  * nothing exists for this packet, drop it.
 102  */
 103 /*
 104  * Raw protocol interface.
 105  */
 106 void
 107 raw_input(struct mbuf *m0, struct sockproto *proto, struct sockaddr *src,
 108           struct sockaddr *dst)
 109 {
 110         struct rawcb *rp;
 111         struct mbuf *m = m0;
 112         int sockets = 0;
 113         struct socket *last;
 114         int error;
 115
 116 //####LD raw_input is called from many places, input & output path. We have to assume the
 117 //####LD socket we'll find and need to append to is unlocked.
 118 //####LD calls from the output (locked) path need to make sure the socket is not locked when
 119 //####LD we call in raw_input
 120         last = NULL;
 121         lck_mtx_lock(raw_mtx);
 122         LIST_FOREACH(rp, &rawcb_list, list) {
 123                 if (rp->rcb_proto.sp_family != proto->sp_family)
 124                         continue;
 125                 if (rp->rcb_proto.sp_protocol  &&
 126                     rp->rcb_proto.sp_protocol != proto->sp_protocol)
 127                         continue;
 128                 /*
 129                  * We assume the lower level routines have
 130                  * placed the address in a canonical format
 131                  * suitable for a structure comparison.
 132                  *
 133                  * Note that if the lengths are not the same
 134                  * the comparison will fail at the first byte.
 135                  */
 136 #define equal(a1, a2) \
 137   (bcmp((caddr_t)(a1), (caddr_t)(a2), a1->sa_len) == 0)
 138                 if (rp->rcb_laddr && !equal(rp->rcb_laddr, dst))
 139                         continue;
 140                 if (rp->rcb_faddr && !equal(rp->rcb_faddr, src))
 141                         continue;
 142                 if (last) {
 143                         struct mbuf *n;
 144                         n = m_copy(m, 0, (int)M_COPYALL);
 145                         if (n) {
 146                                 socket_lock(last, 1);
 147                                 if (sbappendaddr(&last->so_rcv, src,
 148                                     n, (struct mbuf *)0, &error) != 0) {
 149                                         sorwakeup(last);
 150                                         sockets++;
 151                                 }
 152                                 socket_unlock(last, 1);
 153                         }
 154                 }
 155                 last = rp->rcb_socket;
 156         }
 157         if (last) {
 158                 socket_lock(last, 1);
 159                 if (sbappendaddr(&last->so_rcv, src,
 160                     m, (struct mbuf *)0, &error) != 0) {
 161                         sorwakeup(last);
 162                         sockets++;
 163                 }
 164                 socket_unlock(last, 1);
 165         } else
 166                 m_freem(m);
 167         lck_mtx_unlock(raw_mtx);
 168 }
 169
 170 /*ARGSUSED*/
 171 void
 172 raw_ctlinput(int cmd, __unused struct sockaddr *arg, __unused void *dummy)
 173 {
 174
 175         if (cmd < 0 || cmd > PRC_NCMDS)
 176                 return;
 177         /* INCOMPLETE */
 178 }
 179
 180 static int
 181 raw_uabort(struct socket *so)
 182 {
 183         struct rawcb *rp = sotorawcb(so);
 184
 185         lck_mtx_t * mutex_held;
 186         if (so->so_proto->pr_getlock != NULL)
 187                 mutex_held = (*so->so_proto->pr_getlock)(so, 0);
 188         else
 189                 mutex_held = so->so_proto->pr_domain->dom_mtx;
 190         lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
 191
 192         if (rp == 0)
 193                 return EINVAL;
 194         raw_disconnect(rp);
 195         sofree(so);
 196         soisdisconnected(so);
 197         return 0;
 198 }
 199
 200 /* pru_accept is EOPNOTSUPP */
 201
 202 static int
 203 raw_uattach(struct socket *so, int proto, __unused struct proc *p)
 204 {
 205         struct rawcb *rp = sotorawcb(so);
 206
 207         if (rp == 0)
 208                 return EINVAL;
 209                 if ((so->so_state & SS_PRIV) == 0)
 210                         return (EPERM);
 211         return raw_attach(so, proto);
 212 }
 213
 214 static int
 215 raw_ubind(__unused struct socket *so, __unused struct sockaddr *nam, __unused struct proc *p)
 216 {
 217         return EINVAL;
 218 }
 219
 220 static int
 221 raw_uconnect(__unused struct socket *so, __unused struct sockaddr *nam, __unused struct proc *p)
 222 {
 223         return EINVAL;
 224 }
 225
 226 /* pru_connect2 is EOPNOTSUPP */
 227 /* pru_control is EOPNOTSUPP */
 228
 229 static int
 230 raw_udetach(struct socket *so)
 231 {
 232         struct rawcb *rp = sotorawcb(so);
 233
 234         lck_mtx_t * mutex_held;
 235         if (so->so_proto->pr_getlock != NULL)
 236                 mutex_held = (*so->so_proto->pr_getlock)(so, 0);
 237         else
 238                 mutex_held = so->so_proto->pr_domain->dom_mtx;
 239         lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
 240         if (rp == 0)
 241                 return EINVAL;
 242
 243         raw_detach(rp);
 244         return 0;
 245 }
 246
 247 static int
 248 raw_udisconnect(struct socket *so)
 249 {
 250         struct rawcb *rp = sotorawcb(so);
 251
 252         if (rp == 0)
 253                 return EINVAL;
 254         if (rp->rcb_faddr == 0) {
 255                 return ENOTCONN;
 256         }
 257         raw_disconnect(rp);
 258         soisdisconnected(so);
 259         return 0;
 260 }
 261
 262 /* pru_listen is EOPNOTSUPP */
 263
 264 static int
 265 raw_upeeraddr(struct socket *so, struct sockaddr **nam)
 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         *nam = dup_sockaddr(rp->rcb_faddr, 1);
 275         return 0;
 276 }
 277
 278 /* pru_rcvd is EOPNOTSUPP */
 279 /* pru_rcvoob is EOPNOTSUPP */
 280
 281 static int
 282 raw_usend(struct socket *so, int flags, struct mbuf *m,
 283           struct sockaddr *nam, struct mbuf *control, __unused struct proc *p)
 284 {
 285         int error;
 286         struct rawcb *rp = sotorawcb(so);
 287
 288         lck_mtx_t * mutex_held;
 289         if (so->so_proto->pr_getlock != NULL)
 290                 mutex_held = (*so->so_proto->pr_getlock)(so, 0);
 291         else
 292                 mutex_held = so->so_proto->pr_domain->dom_mtx;
 293         lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
 294
 295         if (rp == 0) {
 296                 error = EINVAL;
 297                 goto release;
 298         }
 299
 300         if (flags & PRUS_OOB) {
 301                 error = EOPNOTSUPP;
 302                 goto release;
 303         }
 304
 305         if (so->so_proto->pr_output == NULL) {
 306                 error = EOPNOTSUPP;
 307                 goto release;
 308         }
 309
 310         if (control && control->m_len) {
 311                 error = EOPNOTSUPP;
 312                 goto release;
 313         }
 314         if (nam) {
 315                 if (rp->rcb_faddr) {
 316                         error = EISCONN;
 317                         goto release;
 318                 }
 319                 rp->rcb_faddr = nam;
 320         } else if (rp->rcb_faddr == 0) {
 321                 error = ENOTCONN;
 322                 goto release;
 323         }
 324         error = (*so->so_proto->pr_output)(m, so);
 325         m = NULL;
 326         if (nam)
 327                 rp->rcb_faddr = NULL;
 328 release:
 329         if (m != NULL)
 330                 m_freem(m);
 331         return (error);
 332 }
 333
 334 /* pru_sense is null */
 335
 336 static int
 337 raw_ushutdown(struct socket *so)
 338 {
 339         struct rawcb *rp = sotorawcb(so);
 340         lck_mtx_t * mutex_held;
 341         if (so->so_proto->pr_getlock != NULL)
 342                 mutex_held = (*so->so_proto->pr_getlock)(so, 0);
 343         else
 344                 mutex_held = so->so_proto->pr_domain->dom_mtx;
 345         lck_mtx_assert(mutex_held, LCK_MTX_ASSERT_OWNED);
 346
 347         if (rp == 0)
 348                 return EINVAL;
 349         socantsendmore(so);
 350         return 0;
 351 }
 352
 353 static int
 354 raw_usockaddr(struct socket *so, struct sockaddr **nam)
 355 {
 356         struct rawcb *rp = sotorawcb(so);
 357
 358         if (rp == 0)
 359                 return EINVAL;
 360         if (rp->rcb_laddr == 0)
 361                 return EINVAL;
 362         *nam = dup_sockaddr(rp->rcb_laddr, 1);
 363         return 0;
 364 }
 365
 366 struct pr_usrreqs raw_usrreqs = {
 367         raw_uabort, pru_accept_notsupp, raw_uattach, raw_ubind, raw_uconnect,
 368         pru_connect2_notsupp, pru_control_notsupp, raw_udetach,
 369         raw_udisconnect, pru_listen_notsupp, raw_upeeraddr, pru_rcvd_notsupp,
 370         pru_rcvoob_notsupp, raw_usend, pru_sense_null, raw_ushutdown,
 371         raw_usockaddr, sosend, soreceive, pru_sopoll_notsupp
 372 };