raw_usrreq.c

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    1 /*      $NetBSD: raw_usrreq.c,v 1.30 2006/11/16 01:33:40 christos 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 1.30 2006/11/16 01:33:40 christos 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  * Initialize raw connection block q.
   56  */
   57 void
   58 raw_init(void)
   59 {
   60 
   61         LIST_INIT(&rawcb);
   62 }
   63 
   64 
   65 /*
   66  * Raw protocol input routine.  Find the socket
   67  * associated with the packet(s) and move them over.  If
   68  * nothing exists for this packet, drop it.
   69  */
   70 /*
   71  * Raw protocol interface.
   72  */
   73 void
   74 raw_input(struct mbuf *m0, ...)
   75 {
   76         struct rawcb *rp;
   77         struct mbuf *m = m0;
   78         int sockets = 0;
   79         struct socket *last;
   80         va_list ap;
   81         struct sockproto *proto;
   82         struct sockaddr *src, *dst;
   83 
   84         va_start(ap, m0);
   85         proto = va_arg(ap, struct sockproto *);
   86         src = va_arg(ap, struct sockaddr *);
   87         dst = va_arg(ap, struct sockaddr *);
   88         va_end(ap);
   89 
   90         last = 0;
   91         LIST_FOREACH(rp, &rawcb, rcb_list) {
   92                 if (rp->rcb_proto.sp_family != proto->sp_family)
   93                         continue;
   94                 if (rp->rcb_proto.sp_protocol  &&
   95                     rp->rcb_proto.sp_protocol != proto->sp_protocol)
   96                         continue;
   97                 /*
   98                  * We assume the lower level routines have
   99                  * placed the address in a canonical format
  100                  * suitable for a structure comparison.
  101                  *
  102                  * Note that if the lengths are not the same
  103                  * the comparison will fail at the first byte.
  104                  */
  105 #define equal(a1, a2) \
  106   (bcmp((caddr_t)(a1), (caddr_t)(a2), a1->sa_len) == 0)
  107                 if (rp->rcb_laddr && !equal(rp->rcb_laddr, dst))
  108                         continue;
  109                 if (rp->rcb_faddr && !equal(rp->rcb_faddr, src))
  110                         continue;
  111                 if (last) {
  112                         struct mbuf *n;
  113                         if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
  114                                 if (sbappendaddr(&last->so_rcv, src,
  115                                     n, (struct mbuf *)0) == 0)
  116                                         /* should notify about lost packet */
  117                                         m_freem(n);
  118                                 else {
  119                                         sorwakeup(last);
  120                                         sockets++;
  121                                 }
  122                         }
  123                 }
  124                 last = rp->rcb_socket;
  125         }
  126         if (last) {
  127                 if (sbappendaddr(&last->so_rcv, src,
  128                     m, (struct mbuf *)0) == 0)
  129                         m_freem(m);
  130                 else {
  131                         sorwakeup(last);
  132                         sockets++;
  133                 }
  134         } else
  135                 m_freem(m);
  136 }
  137 
  138 /*ARGSUSED*/
  139 void *
  140 raw_ctlinput(int cmd, struct sockaddr *arg, void *d)
  141 {
  142 
  143         if ((unsigned)cmd >= PRC_NCMDS)
  144                 return NULL;
  145         return NULL;
  146         /* INCOMPLETE */
  147 }
  148 
  149 void
  150 raw_setsockaddr(struct rawcb *rp, struct mbuf *nam)
  151 {
  152 
  153         nam->m_len = rp->rcb_laddr->sa_len;
  154         bcopy(rp->rcb_laddr, mtod(nam, caddr_t), (size_t)nam->m_len);
  155 }
  156 
  157 void
  158 raw_setpeeraddr(struct rawcb *rp, struct mbuf *nam)
  159 {
  160 
  161         nam->m_len = rp->rcb_faddr->sa_len;
  162         bcopy(rp->rcb_faddr, mtod(nam, caddr_t), (size_t)nam->m_len);
  163 }
  164 
  165 /*ARGSUSED*/
  166 int
  167 raw_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
  168     struct mbuf *control, struct lwp *l)
  169 {
  170         struct rawcb *rp;
  171         int s;
  172         int error = 0;
  173 
  174         if (req == PRU_CONTROL)
  175                 return (EOPNOTSUPP);
  176 
  177         s = splsoftnet();
  178         rp = sotorawcb(so);
  179 #ifdef DIAGNOSTIC
  180         if (req != PRU_SEND && req != PRU_SENDOOB && control)
  181                 panic("raw_usrreq: unexpected control mbuf");
  182 #endif
  183         if (rp == 0 && req != PRU_ATTACH) {
  184                 error = EINVAL;
  185                 goto release;
  186         }
  187 
  188         switch (req) {
  189 
  190         /*
  191          * Allocate a raw control block and fill in the
  192          * necessary info to allow packets to be routed to
  193          * the appropriate raw interface routine.
  194          */
  195         case PRU_ATTACH:
  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                             (struct mbuf *)0, nam, (struct mbuf *)0, 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                 return (0);
  280 
  281         /*
  282          * Not supported.
  283          */
  284         case PRU_RCVOOB:
  285                 error = EOPNOTSUPP;
  286                 break;
  287 
  288         case PRU_SENDOOB:
  289                 m_freem(control);
  290                 m_freem(m);
  291                 error = EOPNOTSUPP;
  292                 break;
  293 
  294         case PRU_SOCKADDR:
  295                 if (rp->rcb_laddr == 0) {
  296                         error = EINVAL;
  297                         break;
  298                 }
  299                 raw_setsockaddr(rp, nam);
  300                 break;
  301 
  302         case PRU_PEERADDR:
  303                 if (rp->rcb_faddr == 0) {
  304                         error = ENOTCONN;
  305                         break;
  306                 }
  307                 raw_setpeeraddr(rp, nam);
  308                 break;
  309 
  310         default:
  311                 panic("raw_usrreq");
  312         }
  313 
  314 release:
  315         splx(s);
  316         return (error);
  317 }
Cache object: 37b246c0a6ee77a850a939993e4b06fb
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FreeBSD/Linux Kernel Cross Reference sys/net/raw_usrreq.c

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