raw_usrreq.c

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    1 /*      $NetBSD: raw_usrreq.c,v 1.21 2003/09/30 00:01:18 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 1.21 2003/09/30 00:01:18 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 
   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 #if __STDC__
   74 raw_input(struct mbuf *m0, ...)
   75 #else
   76 raw_input(m0, va_alist)
   77         struct mbuf *m0;
   78         va_dcl
   79 #endif
   80 {
   81         struct rawcb *rp;
   82         struct mbuf *m = m0;
   83         int sockets = 0;
   84         struct socket *last;
   85         va_list ap;
   86         struct sockproto *proto;
   87         struct sockaddr *src, *dst;
   88         
   89         va_start(ap, m0);
   90         proto = va_arg(ap, struct sockproto *);
   91         src = va_arg(ap, struct sockaddr *);
   92         dst = va_arg(ap, struct sockaddr *);
   93         va_end(ap);
   94 
   95         last = 0;
   96         LIST_FOREACH(rp, &rawcb, rcb_list) {
   97                 if (rp->rcb_proto.sp_family != proto->sp_family)
   98                         continue;
   99                 if (rp->rcb_proto.sp_protocol  &&
  100                     rp->rcb_proto.sp_protocol != proto->sp_protocol)
  101                         continue;
  102                 /*
  103                  * We assume the lower level routines have
  104                  * placed the address in a canonical format
  105                  * suitable for a structure comparison.
  106                  *
  107                  * Note that if the lengths are not the same
  108                  * the comparison will fail at the first byte.
  109                  */
  110 #define equal(a1, a2) \
  111   (bcmp((caddr_t)(a1), (caddr_t)(a2), a1->sa_len) == 0)
  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) {
  117                         struct mbuf *n;
  118                         if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
  119                                 if (sbappendaddr(&last->so_rcv, src,
  120                                     n, (struct mbuf *)0) == 0)
  121                                         /* should notify about lost packet */
  122                                         m_freem(n);
  123                                 else {
  124                                         sorwakeup(last);
  125                                         sockets++;
  126                                 }
  127                         }
  128                 }
  129                 last = rp->rcb_socket;
  130         }
  131         if (last) {
  132                 if (sbappendaddr(&last->so_rcv, src,
  133                     m, (struct mbuf *)0) == 0)
  134                         m_freem(m);
  135                 else {
  136                         sorwakeup(last);
  137                         sockets++;
  138                 }
  139         } else
  140                 m_freem(m);
  141 }
  142 
  143 /*ARGSUSED*/
  144 void *
  145 raw_ctlinput(cmd, arg, d)
  146         int cmd;
  147         struct sockaddr *arg;
  148         void *d;
  149 {
  150 
  151         if ((unsigned)cmd >= PRC_NCMDS)
  152                 return NULL;
  153         return NULL;
  154         /* INCOMPLETE */
  155 }
  156 
  157 void
  158 raw_setsockaddr(rp, nam)
  159         struct rawcb *rp;
  160         struct mbuf *nam;
  161 {
  162 
  163         nam->m_len = rp->rcb_laddr->sa_len;
  164         bcopy(rp->rcb_laddr, mtod(nam, caddr_t), (size_t)nam->m_len);
  165 }
  166 
  167 void
  168 raw_setpeeraddr(rp, nam)
  169         struct rawcb *rp;
  170         struct mbuf *nam;
  171 {
  172 
  173         nam->m_len = rp->rcb_faddr->sa_len;
  174         bcopy(rp->rcb_faddr, mtod(nam, caddr_t), (size_t)nam->m_len);
  175 }
  176 
  177 /*ARGSUSED*/
  178 int
  179 raw_usrreq(so, req, m, nam, control, p)
  180         struct socket *so;
  181         int req;
  182         struct mbuf *m, *nam, *control;
  183         struct proc *p;
  184 {
  185         struct rawcb *rp;
  186         int s;
  187         int error = 0;
  188 
  189         if (req == PRU_CONTROL)
  190                 return (EOPNOTSUPP);
  191 
  192         s = splsoftnet();
  193         rp = sotorawcb(so);
  194 #ifdef DIAGNOSTIC
  195         if (req != PRU_SEND && req != PRU_SENDOOB && control)
  196                 panic("raw_usrreq: unexpected control mbuf");
  197 #endif
  198         if (rp == 0 && req != PRU_ATTACH) {
  199                 error = EINVAL;
  200                 goto release;
  201         }
  202 
  203         switch (req) {
  204 
  205         /*
  206          * Allocate a raw control block and fill in the
  207          * necessary info to allow packets to be routed to
  208          * the appropriate raw interface routine.
  209          */
  210         case PRU_ATTACH:
  211                 if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) {
  212                         error = EACCES;
  213                         break;
  214                 }
  215                 error = raw_attach(so, (int)(long)nam);
  216                 break;
  217 
  218         /*
  219          * Destroy state just before socket deallocation.
  220          * Flush data or not depending on the options.
  221          */
  222         case PRU_DETACH:
  223                 raw_detach(rp);
  224                 break;
  225 
  226         /*
  227          * If a socket isn't bound to a single address,
  228          * the raw input routine will hand it anything
  229          * within that protocol family (assuming there's
  230          * nothing else around it should go to). 
  231          */
  232         case PRU_BIND:
  233         case PRU_LISTEN:
  234         case PRU_CONNECT:
  235         case PRU_CONNECT2:
  236                 error = EOPNOTSUPP;
  237                 break;
  238 
  239         case PRU_DISCONNECT:
  240                 soisdisconnected(so);
  241                 raw_disconnect(rp);
  242                 break;
  243 
  244         /*
  245          * Mark the connection as being incapable of further input.
  246          */
  247         case PRU_SHUTDOWN:
  248                 socantsendmore(so);
  249                 break;
  250 
  251         case PRU_RCVD:
  252                 error = EOPNOTSUPP;
  253                 break;
  254 
  255         /*
  256          * Ship a packet out.  The appropriate raw output
  257          * routine handles any massaging necessary.
  258          */
  259         case PRU_SEND:
  260                 if (control && control->m_len) {
  261                         m_freem(control);
  262                         m_freem(m);
  263                         error = EINVAL;
  264                         break;
  265                 }
  266                 if (nam) {
  267                         if ((so->so_state & SS_ISCONNECTED) != 0) {
  268                                 error = EISCONN;
  269                                 goto die;
  270                         }
  271                         error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
  272                             (struct mbuf *)0, nam, (struct mbuf *)0, p);
  273                         if (error) {
  274                         die:
  275                                 m_freem(m);
  276                                 break;
  277                         }
  278                 } else {
  279                         if ((so->so_state & SS_ISCONNECTED) == 0) {
  280                                 error = ENOTCONN;
  281                                 goto die;
  282                         }
  283                 }
  284                 error = (*so->so_proto->pr_output)(m, so);
  285                 if (nam)
  286                         raw_disconnect(rp);
  287                 break;
  288 
  289         case PRU_SENSE:
  290                 /*
  291                  * stat: don't bother with a blocksize.
  292                  */
  293                 return (0);
  294 
  295         /*
  296          * Not supported.
  297          */
  298         case PRU_RCVOOB:
  299                 error = EOPNOTSUPP;
  300                 break;
  301 
  302         case PRU_SENDOOB:
  303                 m_freem(control);
  304                 m_freem(m);
  305                 error = EOPNOTSUPP;
  306                 break;
  307 
  308         case PRU_SOCKADDR:
  309                 if (rp->rcb_laddr == 0) {
  310                         error = EINVAL;
  311                         break;
  312                 }
  313                 raw_setsockaddr(rp, nam);
  314                 break;
  315 
  316         case PRU_PEERADDR:
  317                 if (rp->rcb_faddr == 0) {
  318                         error = ENOTCONN;
  319                         break;
  320                 }
  321                 raw_setpeeraddr(rp, nam);
  322                 break;
  323 
  324         default:
  325                 panic("raw_usrreq");
  326         }
  327 
  328 release:
  329         splx(s);
  330         return (error);
  331 }
Cache object: 20eb105dffe095b1477f3b53a4f47b43
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FreeBSD/Linux Kernel Cross Reference sys/net/raw_usrreq.c

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