raw_usrreq.c

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    1 /*      $NetBSD: raw_usrreq.c,v 1.35.8.1 2011/01/16 13:04:33 bouyer Exp $       */
    2 
    3 /*
    4  * Copyright (c) 1980, 1986, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)raw_usrreq.c        8.1 (Berkeley) 6/10/93
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __KERNEL_RCSID(0, "$NetBSD: raw_usrreq.c,v 1.35.8.1 2011/01/16 13:04:33 bouyer Exp $");
   36 
   37 #include <sys/param.h>
   38 #include <sys/mbuf.h>
   39 #include <sys/domain.h>
   40 #include <sys/protosw.h>
   41 #include <sys/socket.h>
   42 #include <sys/socketvar.h>
   43 #include <sys/errno.h>
   44 #include <sys/systm.h>
   45 #include <sys/proc.h>
   46 #include <sys/kauth.h>
   47 
   48 #include <net/if.h>
   49 #include <net/route.h>
   50 #include <net/netisr.h>
   51 #include <net/raw_cb.h>
   52 
   53 #include <machine/stdarg.h>
   54 
   55 /*
   56  * Initialize raw connection block q.
   57  */
   58 void
   59 raw_init(void)
   60 {
   61 
   62         LIST_INIT(&rawcb);
   63 }
   64 
   65 static inline int
   66 equal(const struct sockaddr *a1, const struct sockaddr *a2)
   67 {
   68         return memcmp(a1, a2, a1->sa_len) == 0;
   69 }
   70 
   71 /*
   72  * Raw protocol input routine.  Find the socket
   73  * associated with the packet(s) and move them over.  If
   74  * nothing exists for this packet, drop it.
   75  */
   76 /*
   77  * Raw protocol interface.
   78  */
   79 void
   80 raw_input(struct mbuf *m0, ...)
   81 {
   82         struct rawcb *rp;
   83         struct mbuf *m = m0;
   84         struct socket *last;
   85         va_list ap;
   86         struct sockproto *proto;
   87         struct sockaddr *src, *dst;
   88 
   89         KASSERT(mutex_owned(softnet_lock));
   90 
   91         va_start(ap, m0);
   92         proto = va_arg(ap, struct sockproto *);
   93         src = va_arg(ap, struct sockaddr *);
   94         dst = va_arg(ap, struct sockaddr *);
   95         va_end(ap);
   96 
   97         last = NULL;
   98         LIST_FOREACH(rp, &rawcb, rcb_list) {
   99                 if (rp->rcb_proto.sp_family != proto->sp_family)
  100                         continue;
  101                 if (rp->rcb_proto.sp_protocol  &&
  102                     rp->rcb_proto.sp_protocol != proto->sp_protocol)
  103                         continue;
  104                 /*
  105                  * We assume the lower level routines have
  106                  * placed the address in a canonical format
  107                  * suitable for a structure comparison.
  108                  *
  109                  * Note that if the lengths are not the same
  110                  * the comparison will fail at the first byte.
  111                  */
  112                 if (rp->rcb_laddr && !equal(rp->rcb_laddr, dst))
  113                         continue;
  114                 if (rp->rcb_faddr && !equal(rp->rcb_faddr, src))
  115                         continue;
  116                 if (last != NULL) {
  117                         struct mbuf *n;
  118                         if ((n = m_copy(m, 0, M_COPYALL)) == NULL)
  119                                 ;
  120                         else if (sbappendaddr(&last->so_rcv, src, n, NULL) == 0)
  121                                 /* should notify about lost packet */
  122                                 m_freem(n);
  123                         else {
  124                                 sorwakeup(last);
  125                         }
  126                 }
  127                 last = rp->rcb_socket;
  128         }
  129         if (last == NULL || sbappendaddr(&last->so_rcv, src, m, NULL) == 0)
  130                 m_freem(m);
  131         else {
  132                 sorwakeup(last);
  133         }
  134 }
  135 
  136 /*ARGSUSED*/
  137 void *
  138 raw_ctlinput(int cmd, const struct sockaddr *arg, void *d)
  139 {
  140 
  141         if ((unsigned)cmd >= PRC_NCMDS)
  142                 return NULL;
  143         return NULL;
  144         /* INCOMPLETE */
  145 }
  146 
  147 void
  148 raw_setsockaddr(struct rawcb *rp, struct mbuf *nam)
  149 {
  150 
  151         nam->m_len = rp->rcb_laddr->sa_len;
  152         memcpy(mtod(nam, void *), rp->rcb_laddr, (size_t)nam->m_len);
  153 }
  154 
  155 void
  156 raw_setpeeraddr(struct rawcb *rp, struct mbuf *nam)
  157 {
  158 
  159         nam->m_len = rp->rcb_faddr->sa_len;
  160         memcpy(mtod(nam, void *), rp->rcb_faddr, (size_t)nam->m_len);
  161 }
  162 
  163 /*ARGSUSED*/
  164 int
  165 raw_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
  166     struct mbuf *control, struct lwp *l)
  167 {
  168         struct rawcb *rp;
  169         int s;
  170         int error = 0;
  171 
  172         if (req == PRU_CONTROL)
  173                 return (EOPNOTSUPP);
  174 
  175         s = splsoftnet();
  176         KERNEL_LOCK(1, NULL);
  177         rp = sotorawcb(so);
  178 #ifdef DIAGNOSTIC
  179         if (req != PRU_SEND && req != PRU_SENDOOB && control)
  180                 panic("raw_usrreq: unexpected control mbuf");
  181 #endif
  182         if (rp == NULL && req != PRU_ATTACH) {
  183                 error = EINVAL;
  184                 goto release;
  185         }
  186 
  187         switch (req) {
  188 
  189         /*
  190          * Allocate a raw control block and fill in the
  191          * necessary info to allow packets to be routed to
  192          * the appropriate raw interface routine.
  193          */
  194         case PRU_ATTACH:
  195                 sosetlock(so);
  196                 if (l == NULL)
  197                         break;
  198 
  199                 /* XXX: raw socket permissions are checked in socreate() */
  200 
  201                 error = raw_attach(so, (int)(long)nam);
  202                 break;
  203 
  204         /*
  205          * Destroy state just before socket deallocation.
  206          * Flush data or not depending on the options.
  207          */
  208         case PRU_DETACH:
  209                 raw_detach(rp);
  210                 break;
  211 
  212         /*
  213          * If a socket isn't bound to a single address,
  214          * the raw input routine will hand it anything
  215          * within that protocol family (assuming there's
  216          * nothing else around it should go to).
  217          */
  218         case PRU_BIND:
  219         case PRU_LISTEN:
  220         case PRU_CONNECT:
  221         case PRU_CONNECT2:
  222                 error = EOPNOTSUPP;
  223                 break;
  224 
  225         case PRU_DISCONNECT:
  226                 soisdisconnected(so);
  227                 raw_disconnect(rp);
  228                 break;
  229 
  230         /*
  231          * Mark the connection as being incapable of further input.
  232          */
  233         case PRU_SHUTDOWN:
  234                 socantsendmore(so);
  235                 break;
  236 
  237         case PRU_RCVD:
  238                 error = EOPNOTSUPP;
  239                 break;
  240 
  241         /*
  242          * Ship a packet out.  The appropriate raw output
  243          * routine handles any massaging necessary.
  244          */
  245         case PRU_SEND:
  246                 if (control && control->m_len) {
  247                         m_freem(control);
  248                         m_freem(m);
  249                         error = EINVAL;
  250                         break;
  251                 }
  252                 if (nam) {
  253                         if ((so->so_state & SS_ISCONNECTED) != 0) {
  254                                 error = EISCONN;
  255                                 goto die;
  256                         }
  257                         error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
  258                             NULL, nam, NULL, l);
  259                         if (error) {
  260                         die:
  261                                 m_freem(m);
  262                                 break;
  263                         }
  264                 } else {
  265                         if ((so->so_state & SS_ISCONNECTED) == 0) {
  266                                 error = ENOTCONN;
  267                                 goto die;
  268                         }
  269                 }
  270                 error = (*so->so_proto->pr_output)(m, so);
  271                 if (nam)
  272                         raw_disconnect(rp);
  273                 break;
  274 
  275         case PRU_SENSE:
  276                 /*
  277                  * stat: don't bother with a blocksize.
  278                  */
  279                 error = 0;
  280                 break;
  281 
  282         /*
  283          * Not supported.
  284          */
  285         case PRU_RCVOOB:
  286                 error = EOPNOTSUPP;
  287                 break;
  288 
  289         case PRU_SENDOOB:
  290                 m_freem(control);
  291                 m_freem(m);
  292                 error = EOPNOTSUPP;
  293                 break;
  294 
  295         case PRU_SOCKADDR:
  296                 if (rp->rcb_laddr == NULL) {
  297                         error = EINVAL;
  298                         break;
  299                 }
  300                 raw_setsockaddr(rp, nam);
  301                 break;
  302 
  303         case PRU_PEERADDR:
  304                 if (rp->rcb_faddr == NULL) {
  305                         error = ENOTCONN;
  306                         break;
  307                 }
  308                 raw_setpeeraddr(rp, nam);
  309                 break;
  310 
  311         default:
  312                 panic("raw_usrreq");
  313         }
  314 
  315 release:
  316         KERNEL_UNLOCK_ONE(NULL);
  317         splx(s);
  318         return (error);
  319 }
Cache object: e445e833c929ceb504bd4bb6ae319f92
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FreeBSD/Linux Kernel Cross Reference sys/net/raw_usrreq.c

FreeBSD/Linux Kernel Cross Reference
sys/net/raw_usrreq.c
