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raw_cb.c revision 1.23 
      1 /*	$NetBSD: raw_cb.c,v 1.23 2017/07/27 09:53:57 ozaki-r 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 1.23 2017/07/27 09:53:57 ozaki-r 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/kmem.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 static u_long		raw_sendspace = RAWSNDQ;
     63 static u_long		raw_recvspace = RAWRCVQ;
     64 
     65 /*
     66  * Allocate a nominal amount of buffer space for the socket.
     67  */
     68 int
     69 raw_attach(struct socket *so, int proto)
     70 {
     71 	struct rawcb *rp;
     72 	int error;
     73 
     74 	/*
     75 	 * It is assumed that raw_attach() is called after space has been
     76 	 * allocated for the rawcb; consumer protocols may simply allocate
     77 	 * type struct rawcb, or a wrapper data structure that begins with a
     78 	 * struct rawcb.
     79 	 */
     80 	rp = sotorawcb(so);
     81 	KASSERT(rp != NULL);
     82 	sosetlock(so);
     83 
     84 	if ((error = soreserve(so, raw_sendspace, raw_recvspace)) != 0) {
     85 		return error;
     86 	}
     87 	rp->rcb_socket = so;
     88 	rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
     89 	rp->rcb_proto.sp_protocol = proto;
     90 	LIST_INSERT_HEAD(&rawcb, rp, rcb_list);
     91 	KASSERT(solocked(so));
     92 
     93 	return 0;
     94 }
     95 
     96 /*
     97  * Detach the raw connection block and discard socket resources.
     98  */
     99 void
    100 raw_detach(struct socket *so)
    101 {
    102 	struct rawcb *rp = sotorawcb(so);
    103 	const size_t rcb_len = rp->rcb_len;
    104 
    105 	KASSERT(rp != NULL);
    106 	KASSERT(solocked(so));
    107 
    108 	/* Remove the last reference. */
    109 	LIST_REMOVE(rp, rcb_list);
    110 	so->so_pcb = NULL;
    111 
    112 	/* Note: sofree() drops the socket's lock. */
    113 	sofree(so);
    114 	kmem_free(rp, rcb_len);
    115 	if (so->so_lock != softnet_lock) {
    116 		so->so_lock = softnet_lock;
    117 		mutex_obj_hold(softnet_lock);
    118 	}
    119 	mutex_enter(softnet_lock);
    120 }
    121 
    122 /*
    123  * Disconnect and possibly release resources.
    124  */
    125 void
    126 raw_disconnect(struct rawcb *rp)
    127 {
    128 	struct socket *so = rp->rcb_socket;
    129 
    130 	if (so->so_state & SS_NOFDREF) {
    131 		raw_detach(so);
    132 	}
    133 }
    134