Home | History | Annotate | Line # | Download | only in net 
      1 /*	$NetBSD: raw_cb.c,v 1.24 2017/09/25 01:56:22 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 1.24 2017/09/25 01:56:22 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 static u_long		raw_sendspace = RAWSNDQ;
     61 static u_long		raw_recvspace = RAWRCVQ;
     62 
     63 /*
     64  * Allocate a nominal amount of buffer space for the socket.
     65  */
     66 int
     67 raw_attach(struct socket *so, int proto, struct rawcbhead *rawcbhead)
     68 {
     69 	struct rawcb *rp;
     70 	int error;
     71 
     72 	/*
     73 	 * It is assumed that raw_attach() is called after space has been
     74 	 * allocated for the rawcb; consumer protocols may simply allocate
     75 	 * type struct rawcb, or a wrapper data structure that begins with a
     76 	 * struct rawcb.
     77 	 */
     78 	rp = sotorawcb(so);
     79 	KASSERT(rp != NULL);
     80 	sosetlock(so);
     81 
     82 	if ((error = soreserve(so, raw_sendspace, raw_recvspace)) != 0) {
     83 		return error;
     84 	}
     85 	rp->rcb_socket = so;
     86 	rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
     87 	rp->rcb_proto.sp_protocol = proto;
     88 	LIST_INSERT_HEAD(rawcbhead, rp, rcb_list);
     89 	KASSERT(solocked(so));
     90 
     91 	return 0;
     92 }
     93 
     94 /*
     95  * Detach the raw connection block and discard socket resources.
     96  */
     97 void
     98 raw_detach(struct socket *so)
     99 {
    100 	struct rawcb *rp = sotorawcb(so);
    101 	const size_t rcb_len = rp->rcb_len;
    102 
    103 	KASSERT(rp != NULL);
    104 	KASSERT(solocked(so));
    105 
    106 	/* Remove the last reference. */
    107 	LIST_REMOVE(rp, rcb_list);
    108 	so->so_pcb = NULL;
    109 
    110 	/* Note: sofree() drops the socket's lock. */
    111 	sofree(so);
    112 	kmem_free(rp, rcb_len);
    113 	if (so->so_lock != softnet_lock) {
    114 		so->so_lock = softnet_lock;
    115 		mutex_obj_hold(softnet_lock);
    116 	}
    117 	mutex_enter(softnet_lock);
    118 }
    119 
    120 /*
    121  * Disconnect and possibly release resources.
    122  */
    123 void
    124 raw_disconnect(struct rawcb *rp)
    125 {
    126 	struct socket *so = rp->rcb_socket;
    127 
    128 	if (so->so_state & SS_NOFDREF) {
    129 		raw_detach(so);
    130 	}
    131 }
    132