raw_usrreq.c

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    1 /*      $NetBSD: raw_usrreq.c,v 1.23 2005/02/26 22:45:09 perry 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 1.23 2005/02/26 22:45:09 perry 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 
   47 #include <net/if.h>
   48 #include <net/route.h>
   49 #include <net/netisr.h>
   50 #include <net/raw_cb.h>
   51 
   52 #include <machine/stdarg.h>
   53 /*
   54  * Initialize raw connection block q.
   55  */
   56 void
   57 raw_init()
   58 {
   59 
   60         LIST_INIT(&rawcb);
   61 }
   62 
   63 
   64 /*
   65  * Raw protocol input routine.  Find the socket
   66  * associated with the packet(s) and move them over.  If
   67  * nothing exists for this packet, drop it.
   68  */
   69 /*
   70  * Raw protocol interface.
   71  */
   72 void
   73 raw_input(struct mbuf *m0, ...)
   74 {
   75         struct rawcb *rp;
   76         struct mbuf *m = m0;
   77         int sockets = 0;
   78         struct socket *last;
   79         va_list ap;
   80         struct sockproto *proto;
   81         struct sockaddr *src, *dst;
   82 
   83         va_start(ap, m0);
   84         proto = va_arg(ap, struct sockproto *);
   85         src = va_arg(ap, struct sockaddr *);
   86         dst = va_arg(ap, struct sockaddr *);
   87         va_end(ap);
   88 
   89         last = 0;
   90         LIST_FOREACH(rp, &rawcb, rcb_list) {
   91                 if (rp->rcb_proto.sp_family != proto->sp_family)
   92                         continue;
   93                 if (rp->rcb_proto.sp_protocol  &&
   94                     rp->rcb_proto.sp_protocol != proto->sp_protocol)
   95                         continue;
   96                 /*
   97                  * We assume the lower level routines have
   98                  * placed the address in a canonical format
   99                  * suitable for a structure comparison.
  100                  *
  101                  * Note that if the lengths are not the same
  102                  * the comparison will fail at the first byte.
  103                  */
  104 #define equal(a1, a2) \
  105   (bcmp((caddr_t)(a1), (caddr_t)(a2), a1->sa_len) == 0)
  106                 if (rp->rcb_laddr && !equal(rp->rcb_laddr, dst))
  107                         continue;
  108                 if (rp->rcb_faddr && !equal(rp->rcb_faddr, src))
  109                         continue;
  110                 if (last) {
  111                         struct mbuf *n;
  112                         if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
  113                                 if (sbappendaddr(&last->so_rcv, src,
  114                                     n, (struct mbuf *)0) == 0)
  115                                         /* should notify about lost packet */
  116                                         m_freem(n);
  117                                 else {
  118                                         sorwakeup(last);
  119                                         sockets++;
  120                                 }
  121                         }
  122                 }
  123                 last = rp->rcb_socket;
  124         }
  125         if (last) {
  126                 if (sbappendaddr(&last->so_rcv, src,
  127                     m, (struct mbuf *)0) == 0)
  128                         m_freem(m);
  129                 else {
  130                         sorwakeup(last);
  131                         sockets++;
  132                 }
  133         } else
  134                 m_freem(m);
  135 }
  136 
  137 /*ARGSUSED*/
  138 void *
  139 raw_ctlinput(cmd, arg, d)
  140         int cmd;
  141         struct sockaddr *arg;
  142         void *d;
  143 {
  144 
  145         if ((unsigned)cmd >= PRC_NCMDS)
  146                 return NULL;
  147         return NULL;
  148         /* INCOMPLETE */
  149 }
  150 
  151 void
  152 raw_setsockaddr(rp, nam)
  153         struct rawcb *rp;
  154         struct mbuf *nam;
  155 {
  156 
  157         nam->m_len = rp->rcb_laddr->sa_len;
  158         bcopy(rp->rcb_laddr, mtod(nam, caddr_t), (size_t)nam->m_len);
  159 }
  160 
  161 void
  162 raw_setpeeraddr(rp, nam)
  163         struct rawcb *rp;
  164         struct mbuf *nam;
  165 {
  166 
  167         nam->m_len = rp->rcb_faddr->sa_len;
  168         bcopy(rp->rcb_faddr, mtod(nam, caddr_t), (size_t)nam->m_len);
  169 }
  170 
  171 /*ARGSUSED*/
  172 int
  173 raw_usrreq(so, req, m, nam, control, p)
  174         struct socket *so;
  175         int req;
  176         struct mbuf *m, *nam, *control;
  177         struct proc *p;
  178 {
  179         struct rawcb *rp;
  180         int s;
  181         int error = 0;
  182 
  183         if (req == PRU_CONTROL)
  184                 return (EOPNOTSUPP);
  185 
  186         s = splsoftnet();
  187         rp = sotorawcb(so);
  188 #ifdef DIAGNOSTIC
  189         if (req != PRU_SEND && req != PRU_SENDOOB && control)
  190                 panic("raw_usrreq: unexpected control mbuf");
  191 #endif
  192         if (rp == 0 && req != PRU_ATTACH) {
  193                 error = EINVAL;
  194                 goto release;
  195         }
  196 
  197         switch (req) {
  198 
  199         /*
  200          * Allocate a raw control block and fill in the
  201          * necessary info to allow packets to be routed to
  202          * the appropriate raw interface routine.
  203          */
  204         case PRU_ATTACH:
  205                 if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) {
  206                         error = EACCES;
  207                         break;
  208                 }
  209                 error = raw_attach(so, (int)(long)nam);
  210                 break;
  211 
  212         /*
  213          * Destroy state just before socket deallocation.
  214          * Flush data or not depending on the options.
  215          */
  216         case PRU_DETACH:
  217                 raw_detach(rp);
  218                 break;
  219 
  220         /*
  221          * If a socket isn't bound to a single address,
  222          * the raw input routine will hand it anything
  223          * within that protocol family (assuming there's
  224          * nothing else around it should go to).
  225          */
  226         case PRU_BIND:
  227         case PRU_LISTEN:
  228         case PRU_CONNECT:
  229         case PRU_CONNECT2:
  230                 error = EOPNOTSUPP;
  231                 break;
  232 
  233         case PRU_DISCONNECT:
  234                 soisdisconnected(so);
  235                 raw_disconnect(rp);
  236                 break;
  237 
  238         /*
  239          * Mark the connection as being incapable of further input.
  240          */
  241         case PRU_SHUTDOWN:
  242                 socantsendmore(so);
  243                 break;
  244 
  245         case PRU_RCVD:
  246                 error = EOPNOTSUPP;
  247                 break;
  248 
  249         /*
  250          * Ship a packet out.  The appropriate raw output
  251          * routine handles any massaging necessary.
  252          */
  253         case PRU_SEND:
  254                 if (control && control->m_len) {
  255                         m_freem(control);
  256                         m_freem(m);
  257                         error = EINVAL;
  258                         break;
  259                 }
  260                 if (nam) {
  261                         if ((so->so_state & SS_ISCONNECTED) != 0) {
  262                                 error = EISCONN;
  263                                 goto die;
  264                         }
  265                         error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
  266                             (struct mbuf *)0, nam, (struct mbuf *)0, p);
  267                         if (error) {
  268                         die:
  269                                 m_freem(m);
  270                                 break;
  271                         }
  272                 } else {
  273                         if ((so->so_state & SS_ISCONNECTED) == 0) {
  274                                 error = ENOTCONN;
  275                                 goto die;
  276                         }
  277                 }
  278                 error = (*so->so_proto->pr_output)(m, so);
  279                 if (nam)
  280                         raw_disconnect(rp);
  281                 break;
  282 
  283         case PRU_SENSE:
  284                 /*
  285                  * stat: don't bother with a blocksize.
  286                  */
  287                 return (0);
  288 
  289         /*
  290          * Not supported.
  291          */
  292         case PRU_RCVOOB:
  293                 error = EOPNOTSUPP;
  294                 break;
  295 
  296         case PRU_SENDOOB:
  297                 m_freem(control);
  298                 m_freem(m);
  299                 error = EOPNOTSUPP;
  300                 break;
  301 
  302         case PRU_SOCKADDR:
  303                 if (rp->rcb_laddr == 0) {
  304                         error = EINVAL;
  305                         break;
  306                 }
  307                 raw_setsockaddr(rp, nam);
  308                 break;
  309 
  310         case PRU_PEERADDR:
  311                 if (rp->rcb_faddr == 0) {
  312                         error = ENOTCONN;
  313                         break;
  314                 }
  315                 raw_setpeeraddr(rp, nam);
  316                 break;
  317 
  318         default:
  319                 panic("raw_usrreq");
  320         }
  321 
  322 release:
  323         splx(s);
  324         return (error);
  325 }
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FreeBSD/Linux Kernel Cross Reference sys/net/raw_usrreq.c

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