raw_usrreq.c

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    1 /*      $NetBSD: raw_usrreq.c,v 1.65 2022/09/02 23:48:11 thorpej 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 /*
   35  * Raw protocol interface.
   36  */
   37 
   38 #include <sys/cdefs.h>
   39 __KERNEL_RCSID(0, "$NetBSD: raw_usrreq.c,v 1.65 2022/09/02 23:48:11 thorpej Exp $");
   40 
   41 #include <sys/param.h>
   42 #include <sys/mbuf.h>
   43 #include <sys/domain.h>
   44 #include <sys/protosw.h>
   45 #include <sys/socket.h>
   46 #include <sys/socketvar.h>
   47 #include <sys/errno.h>
   48 #include <sys/systm.h>
   49 #include <sys/proc.h>
   50 #include <sys/kauth.h>
   51 
   52 #include <net/if.h>
   53 #include <net/route.h>
   54 #include <net/raw_cb.h>
   55 
   56 static inline int
   57 equal(const struct sockaddr *a1, const struct sockaddr *a2)
   58 {
   59         return memcmp(a1, a2, a1->sa_len) == 0;
   60 }
   61 
   62 /*
   63  * raw_input: find the socket associated with the packet and move it over.
   64  * If nothing exists for this packet, drop it.
   65  */
   66 void
   67 raw_input(struct mbuf *m0, struct sockproto *proto, struct sockaddr *src,
   68     struct sockaddr *dst, struct rawcbhead *rawcbhead)
   69 {
   70         struct rawcb *rp;
   71         struct mbuf *m = m0;
   72         struct socket *last;
   73 
   74         last = NULL;
   75         LIST_FOREACH(rp, rawcbhead, rcb_list) {
   76                 if (rp->rcb_proto.sp_family != proto->sp_family)
   77                         continue;
   78                 if (rp->rcb_proto.sp_protocol  &&
   79                     rp->rcb_proto.sp_protocol != proto->sp_protocol)
   80                         continue;
   81                 /*
   82                  * We assume the lower level routines have
   83                  * placed the address in a canonical format
   84                  * suitable for a structure comparison.
   85                  *
   86                  * Note that if the lengths are not the same
   87                  * the comparison will fail at the first byte.
   88                  */
   89                 if (rp->rcb_laddr && !equal(rp->rcb_laddr, dst))
   90                         continue;
   91                 if (rp->rcb_faddr && !equal(rp->rcb_faddr, src))
   92                         continue;
   93                 /* Run any filtering that may have been installed. */
   94                 if (rp->rcb_filter != NULL && rp->rcb_filter(m, proto, rp) != 0)
   95                         continue;
   96                 if (last != NULL) {
   97                         struct mbuf *n;
   98 
   99                         if ((n = m_copypacket(m, M_DONTWAIT)) == NULL ||
  100                             sbappendaddr(&last->so_rcv, src, n, NULL) == 0)
  101                         {
  102                                 if (n != NULL)
  103                                         m_freem(n);
  104                                 soroverflow(last);
  105                         } else
  106                                 sorwakeup(last);
  107                 }
  108                 last = rp->rcb_socket;
  109         }
  110         if (last != NULL) {
  111                 if (sbappendaddr(&last->so_rcv, src, m, NULL) == 0) {
  112                         m_freem(m);
  113                         soroverflow(last);
  114                 } else
  115                         sorwakeup(last);
  116         } else {
  117                 m_freem(m);
  118         }
  119 }
  120 
  121 void *
  122 raw_ctlinput(int cmd, const struct sockaddr *arg, void *d)
  123 {
  124 
  125         if ((unsigned)cmd >= PRC_NCMDS)
  126                 return NULL;
  127         return NULL;
  128         /* INCOMPLETE */
  129 }
  130 
  131 void
  132 raw_setsockaddr(struct rawcb *rp, struct sockaddr *nam)
  133 {
  134 
  135         memcpy(nam, rp->rcb_laddr, rp->rcb_laddr->sa_len);
  136 }
  137 
  138 void
  139 raw_setpeeraddr(struct rawcb *rp, struct sockaddr *nam)
  140 {
  141 
  142         memcpy(nam, rp->rcb_faddr, rp->rcb_faddr->sa_len);
  143 }
  144 
  145 int
  146 raw_send(struct socket *so, struct mbuf *m, struct sockaddr *nam,
  147     struct mbuf *control, struct lwp *l,
  148     int (*output)(struct mbuf *, struct socket *))
  149 {
  150         struct rawcb *rp = sotorawcb(so);
  151         int error = 0;
  152 
  153         KASSERT(rp != NULL);
  154 
  155         /*
  156          * Ship a packet out.  The appropriate raw output
  157          * routine handles any massaging necessary.
  158          */
  159         if (control && control->m_len) {
  160                 m_freem(control);
  161                 m_freem(m);
  162                 return EINVAL;
  163         }
  164         if (nam) {
  165                 if ((so->so_state & SS_ISCONNECTED) != 0) {
  166                         error = EISCONN;
  167                         goto die;
  168                 }
  169                 error = (*so->so_proto->pr_usrreqs->pr_connect)(so, nam, l);
  170                 if (error) {
  171                 die:
  172                         m_freem(m);
  173                         return error;
  174                 }
  175         } else {
  176                 if ((so->so_state & SS_ISCONNECTED) == 0) {
  177                         error = ENOTCONN;
  178                         goto die;
  179                 }
  180         }
  181         error = (*output)(m, so);
  182         if (nam)
  183                 raw_disconnect(rp);
  184 
  185         return error;
  186 }
  187 
  188 int
  189 raw_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
  190     struct mbuf *control, struct lwp *l)
  191 {
  192 
  193         KASSERT(req != PRU_ATTACH);
  194         KASSERT(req != PRU_DETACH);
  195         KASSERT(req != PRU_ACCEPT);
  196         KASSERT(req != PRU_BIND);
  197         KASSERT(req != PRU_LISTEN);
  198         KASSERT(req != PRU_CONNECT);
  199         KASSERT(req != PRU_CONNECT2);
  200         KASSERT(req != PRU_DISCONNECT);
  201         KASSERT(req != PRU_SHUTDOWN);
  202         KASSERT(req != PRU_ABORT);
  203         KASSERT(req != PRU_CONTROL);
  204         KASSERT(req != PRU_SENSE);
  205         KASSERT(req != PRU_PEERADDR);
  206         KASSERT(req != PRU_SOCKADDR);
  207         KASSERT(req != PRU_RCVD);
  208         KASSERT(req != PRU_RCVOOB);
  209         KASSERT(req != PRU_SEND);
  210         KASSERT(req != PRU_SENDOOB);
  211         KASSERT(req != PRU_PURGEIF);
  212 
  213         if (sotorawcb(so) == NULL)
  214                 return EINVAL;
  215 
  216         panic("raw_usrreq");
  217 
  218         return 0;
  219 }

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

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