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raw_cb.c revision 1.17 
      1 /*	$NetBSD: raw_cb.c,v 1.17 2005/12/11 23:05:25 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_cb.c	8.1 (Berkeley) 6/10/93
     32  */
     33 
     34 #include <sys/cdefs.h>
     35 __KERNEL_RCSID(0, "$NetBSD: raw_cb.c,v 1.17 2005/12/11 23:05:25 thorpej Exp $");
     36 
     37 #include <sys/param.h>
     38 #include <sys/systm.h>
     39 #include <sys/mbuf.h>
     40 #include <sys/socket.h>
     41 #include <sys/socketvar.h>
     42 #include <sys/domain.h>
     43 #include <sys/protosw.h>
     44 #include <sys/errno.h>
     45 
     46 #include <net/if.h>
     47 #include <net/route.h>
     48 #include <net/raw_cb.h>
     49 #include <netinet/in.h>
     50 
     51 /*
     52  * Routines to manage the raw protocol control blocks.
     53  *
     54  * TODO:
     55  *	hash lookups by protocol family/protocol + address family
     56  *	take care of unique address problems per AF?
     57  *	redo address binding to allow wildcards
     58  */
     59 
     60 struct	rawcbhead rawcb = LIST_HEAD_INITIALIZER(rawcb);
     61 
     62 u_long	raw_sendspace = RAWSNDQ;
     63 u_long	raw_recvspace = RAWRCVQ;
     64 
     65 /*
     66  * Allocate a control block and a nominal amount
     67  * of buffer space for the socket.
     68  */
     69 int
     70 raw_attach(struct socket *so, int proto)
     71 {
     72 	struct rawcb *rp = sotorawcb(so);
     73 	int error;
     74 
     75 	/*
     76 	 * It is assumed that raw_attach is called
     77 	 * after space has been allocated for the
     78 	 * rawcb.
     79 	 */
     80 	if (rp == 0)
     81 		return (ENOBUFS);
     82 	if ((error = soreserve(so, raw_sendspace, raw_recvspace)) != 0)
     83 		return (error);
     84 	rp->rcb_socket = so;
     85 	rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
     86 	rp->rcb_proto.sp_protocol = proto;
     87 	LIST_INSERT_HEAD(&rawcb, rp, rcb_list);
     88 	return (0);
     89 }
     90 
     91 /*
     92  * Detach the raw connection block and discard
     93  * socket resources.
     94  */
     95 void
     96 raw_detach(struct rawcb *rp)
     97 {
     98 	struct socket *so = rp->rcb_socket;
     99 
    100 	so->so_pcb = 0;
    101 	sofree(so);
    102 	LIST_REMOVE(rp, rcb_list);
    103 #ifdef notdef
    104 	if (rp->rcb_laddr)
    105 		m_freem(dtom(rp->rcb_laddr));
    106 	rp->rcb_laddr = 0;
    107 #endif
    108 	free((caddr_t)rp, M_PCB);
    109 }
    110 
    111 /*
    112  * Disconnect and possibly release resources.
    113  */
    114 void
    115 raw_disconnect(struct rawcb *rp)
    116 {
    117 
    118 #ifdef notdef
    119 	if (rp->rcb_faddr)
    120 		m_freem(dtom(rp->rcb_faddr));
    121 	rp->rcb_faddr = 0;
    122 #endif
    123 	if (rp->rcb_socket->so_state & SS_NOFDREF)
    124 		raw_detach(rp);
    125 }
    126