bsd/net/raw_cb.c

   1 /*
   2  * Copyright (c) 2000-2012 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_cb.c    8.1 (Berkeley) 6/10/93
  61  */
  62
  63 #include <sys/param.h>
  64 #include <sys/malloc.h>
  65 #include <sys/socket.h>
  66 #include <sys/socketvar.h>
  67 #include <sys/domain.h>
  68 #include <sys/protosw.h>
  69 #include <kern/locks.h>
  70
  71 #include <net/raw_cb.h>
  72
  73 /*
  74  * Routines to manage the raw protocol control blocks.
  75  *
  76  * TODO:
  77  *      hash lookups by protocol family/protocol + address family
  78  *      take care of unique address problems per AF?
  79  *      redo address binding to allow wildcards
  80  */
  81
  82 struct rawcb_list_head rawcb_list;
  83
  84 static uint32_t raw_sendspace = RAWSNDQ;
  85 static uint32_t raw_recvspace = RAWRCVQ;
  86 extern lck_mtx_t        *raw_mtx;       /*### global raw cb mutex for now */
  87
  88 /*
  89  * Allocate a control block and a nominal amount
  90  * of buffer space for the socket.
  91  */
  92 int
  93 raw_attach(struct socket *so, int proto)
  94 {
  95         struct rawcb *rp = sotorawcb(so);
  96         int error;
  97
  98         /*
  99          * It is assumed that raw_attach is called
 100          * after space has been allocated for the
 101          * rawcb.
 102          */
 103         if (rp == 0) {
 104                 return ENOBUFS;
 105         }
 106         error = soreserve(so, raw_sendspace, raw_recvspace);
 107         if (error) {
 108                 return error;
 109         }
 110         rp->rcb_socket = so;
 111         rp->rcb_proto.sp_family = SOCK_DOM(so);
 112         rp->rcb_proto.sp_protocol = proto;
 113         lck_mtx_lock(raw_mtx);
 114         LIST_INSERT_HEAD(&rawcb_list, rp, list);
 115         lck_mtx_unlock(raw_mtx);
 116         return 0;
 117 }
 118
 119 /*
 120  * Detach the raw connection block and discard
 121  * socket resources.
 122  */
 123 void
 124 raw_detach(struct rawcb *rp)
 125 {
 126         struct socket *so = rp->rcb_socket;
 127
 128         so->so_pcb = 0;
 129         so->so_flags |= SOF_PCBCLEARING;
 130         sofree(so);
 131         if (!lck_mtx_try_lock(raw_mtx)) {
 132                 socket_unlock(so, 0);
 133                 lck_mtx_lock(raw_mtx);
 134                 socket_lock(so, 0);
 135         }
 136         LIST_REMOVE(rp, list);
 137         lck_mtx_unlock(raw_mtx);
 138 #ifdef notdef
 139         if (rp->rcb_laddr) {
 140                 m_freem(dtom(rp->rcb_laddr));
 141         }
 142         rp->rcb_laddr = 0;
 143 #endif
 144         rp->rcb_socket = NULL;
 145         FREE(rp, M_PCB);
 146 }
 147
 148 /*
 149  * Disconnect and possibly release resources.
 150  */
 151 void
 152 raw_disconnect(struct rawcb *rp)
 153 {
 154         struct socket *so = rp->rcb_socket;
 155
 156 #ifdef notdef
 157         if (rp->rcb_faddr) {
 158                 m_freem(dtom(rp->rcb_faddr));
 159         }
 160         rp->rcb_faddr = 0;
 161 #endif
 162         /*
 163          * A multipath subflow socket would have its SS_NOFDREF set by default,
 164          * so check for SOF_MP_SUBFLOW socket flag before detaching the PCB;
 165          * when the socket is closed for real, SOF_MP_SUBFLOW would be cleared.
 166          */
 167         if (!(so->so_flags & SOF_MP_SUBFLOW) && (so->so_state & SS_NOFDREF)) {
 168                 raw_detach(rp);
 169         }
 170 }
 171
 172 #ifdef notdef
 173 #include <sys/mbuf.h>
 174
 175 int
 176 raw_bind(struct socket *so, struct mbuf *nam)
 177 {
 178         struct sockaddr *addr = mtod(nam, struct sockaddr *);
 179         struct rawcb *rp;
 180
 181         if (ifnet == 0) {
 182                 return EADDRNOTAVAIL;
 183         }
 184         rp = sotorawcb(so);
 185         nam = m_copym(nam, 0, M_COPYALL, M_WAITOK);
 186         if (nam == NULL) {
 187                 return ENOBUFS;
 188         }
 189         rp->rcb_laddr = mtod(nam, struct sockaddr *);
 190         return 0;
 191 }
 192 #endif