The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 1980, 1986, 1993
    3  *      The Regents of the University of California.
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 4. Neither the name of the University nor the names of its contributors
   15  *    may be used to endorse or promote products derived from this software
   16  *    without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  *      @(#)raw_usrreq.c        8.1 (Berkeley) 6/10/93
   31  * $FreeBSD: releng/10.1/sys/net/raw_usrreq.c 225837 2011-09-28 13:48:36Z bz $
   32  */
   33 
   34 #include <sys/param.h>
   35 #include <sys/kernel.h>
   36 #include <sys/lock.h>
   37 #include <sys/malloc.h>
   38 #include <sys/mbuf.h>
   39 #include <sys/mutex.h>
   40 #include <sys/priv.h>
   41 #include <sys/protosw.h>
   42 #include <sys/signalvar.h>
   43 #include <sys/socket.h>
   44 #include <sys/socketvar.h>
   45 #include <sys/sx.h>
   46 #include <sys/systm.h>
   47 
   48 #include <net/if.h>
   49 #include <net/raw_cb.h>
   50 #include <net/vnet.h>
   51 
   52 MTX_SYSINIT(rawcb_mtx, &rawcb_mtx, "rawcb", MTX_DEF);
   53 
   54 /*
   55  * Initialize raw connection block q.
   56  */
   57 void
   58 raw_init(void)
   59 {
   60 
   61         LIST_INIT(&V_rawcb_list);
   62 }
   63 
   64 /*
   65  * Raw protocol input routine.  Find the socket associated with the packet(s)
   66  * and move them over.  If nothing exists for this packet, drop it.
   67  */
   68 /*
   69  * Raw protocol interface.
   70  */
   71 void
   72 raw_input(struct mbuf *m0, struct sockproto *proto, struct sockaddr *src)
   73 {
   74 
   75         return (raw_input_ext(m0, proto, src, NULL));
   76 }
   77 
   78 void
   79 raw_input_ext(struct mbuf *m0, struct sockproto *proto, struct sockaddr *src,
   80     raw_input_cb_fn cb)
   81 {
   82         struct rawcb *rp;
   83         struct mbuf *m = m0;
   84         struct socket *last;
   85 
   86         last = 0;
   87         mtx_lock(&rawcb_mtx);
   88         LIST_FOREACH(rp, &V_rawcb_list, list) {
   89                 if (rp->rcb_proto.sp_family != proto->sp_family)
   90                         continue;
   91                 if (rp->rcb_proto.sp_protocol  &&
   92                     rp->rcb_proto.sp_protocol != proto->sp_protocol)
   93                         continue;
   94                 if (cb != NULL && (*cb)(m, proto, src, rp) != 0)
   95                         continue;
   96                 if (last) {
   97                         struct mbuf *n;
   98                         n = m_copy(m, 0, (int)M_COPYALL);
   99                         if (n) {
  100                                 if (sbappendaddr(&last->so_rcv, src,
  101                                     n, (struct mbuf *)0) == 0)
  102                                         /* should notify about lost packet */
  103                                         m_freem(n);
  104                                 else
  105                                         sorwakeup(last);
  106                         }
  107                 }
  108                 last = rp->rcb_socket;
  109         }
  110         if (last) {
  111                 if (sbappendaddr(&last->so_rcv, src,
  112                     m, (struct mbuf *)0) == 0)
  113                         m_freem(m);
  114                 else
  115                         sorwakeup(last);
  116         } else
  117                 m_freem(m);
  118         mtx_unlock(&rawcb_mtx);
  119 }
  120 
  121 /*ARGSUSED*/
  122 void
  123 raw_ctlinput(int cmd, struct sockaddr *arg, void *dummy)
  124 {
  125 
  126         if (cmd < 0 || cmd >= PRC_NCMDS)
  127                 return;
  128         /* INCOMPLETE */
  129 }
  130 
  131 static void
  132 raw_uabort(struct socket *so)
  133 {
  134 
  135         KASSERT(sotorawcb(so) != NULL, ("raw_uabort: rp == NULL"));
  136 
  137         soisdisconnected(so);
  138 }
  139 
  140 static void
  141 raw_uclose(struct socket *so)
  142 {
  143 
  144         KASSERT(sotorawcb(so) != NULL, ("raw_uabort: rp == NULL"));
  145 
  146         soisdisconnected(so);
  147 }
  148 
  149 /* pru_accept is EOPNOTSUPP */
  150 
  151 static int
  152 raw_uattach(struct socket *so, int proto, struct thread *td)
  153 {
  154         int error;
  155 
  156         /*
  157          * Implementors of raw sockets will already have allocated the PCB,
  158          * so it must be non-NULL here.
  159          */
  160         KASSERT(sotorawcb(so) != NULL, ("raw_uattach: so_pcb == NULL"));
  161 
  162         if (td != NULL) {
  163                 error = priv_check(td, PRIV_NET_RAW);
  164                 if (error)
  165                         return (error);
  166         }
  167         return (raw_attach(so, proto));
  168 }
  169 
  170 static int
  171 raw_ubind(struct socket *so, struct sockaddr *nam, struct thread *td)
  172 {
  173 
  174         return (EINVAL);
  175 }
  176 
  177 static int
  178 raw_uconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
  179 {
  180 
  181         return (EINVAL);
  182 }
  183 
  184 /* pru_connect2 is EOPNOTSUPP */
  185 /* pru_control is EOPNOTSUPP */
  186 
  187 static void
  188 raw_udetach(struct socket *so)
  189 {
  190         struct rawcb *rp = sotorawcb(so);
  191 
  192         KASSERT(rp != NULL, ("raw_udetach: rp == NULL"));
  193 
  194         raw_detach(rp);
  195 }
  196 
  197 static int
  198 raw_udisconnect(struct socket *so)
  199 {
  200 
  201         KASSERT(sotorawcb(so) != NULL, ("raw_udisconnect: rp == NULL"));
  202 
  203         return (ENOTCONN);
  204 }
  205 
  206 /* pru_listen is EOPNOTSUPP */
  207 
  208 static int
  209 raw_upeeraddr(struct socket *so, struct sockaddr **nam)
  210 {
  211 
  212         KASSERT(sotorawcb(so) != NULL, ("raw_upeeraddr: rp == NULL"));
  213 
  214         return (ENOTCONN);
  215 }
  216 
  217 /* pru_rcvd is EOPNOTSUPP */
  218 /* pru_rcvoob is EOPNOTSUPP */
  219 
  220 static int
  221 raw_usend(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  222     struct mbuf *control, struct thread *td)
  223 {
  224 
  225         KASSERT(sotorawcb(so) != NULL, ("raw_usend: rp == NULL"));
  226 
  227         if ((flags & PRUS_OOB) || (control && control->m_len)) {
  228                 /* XXXRW: Should control also be freed here? */
  229                 if (m != NULL)
  230                         m_freem(m);
  231                 return (EOPNOTSUPP);
  232         }
  233 
  234         /*
  235          * For historical (bad?) reasons, we effectively ignore the address
  236          * argument to sendto(2).  Perhaps we should return an error instead?
  237          */
  238         return ((*so->so_proto->pr_output)(m, so));
  239 }
  240 
  241 /* pru_sense is null */
  242 
  243 static int
  244 raw_ushutdown(struct socket *so)
  245 {
  246 
  247         KASSERT(sotorawcb(so) != NULL, ("raw_ushutdown: rp == NULL"));
  248 
  249         socantsendmore(so);
  250         return (0);
  251 }
  252 
  253 static int
  254 raw_usockaddr(struct socket *so, struct sockaddr **nam)
  255 {
  256 
  257         KASSERT(sotorawcb(so) != NULL, ("raw_usockaddr: rp == NULL"));
  258 
  259         return (EINVAL);
  260 }
  261 
  262 struct pr_usrreqs raw_usrreqs = {
  263         .pru_abort =            raw_uabort,
  264         .pru_attach =           raw_uattach,
  265         .pru_bind =             raw_ubind,
  266         .pru_connect =          raw_uconnect,
  267         .pru_detach =           raw_udetach, 
  268         .pru_disconnect =       raw_udisconnect,
  269         .pru_peeraddr =         raw_upeeraddr,
  270         .pru_send =             raw_usend,
  271         .pru_shutdown =         raw_ushutdown,
  272         .pru_sockaddr =         raw_usockaddr,
  273         .pru_close =            raw_uclose,
  274 };

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