132 lines
3.8 KiB
C
132 lines
3.8 KiB
C
/* $NetBSD: raw_cb.c,v 1.24 2017/09/25 01:56:22 ozaki-r Exp $ */
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/*
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* Copyright (c) 1980, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)raw_cb.c 8.1 (Berkeley) 6/10/93
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: raw_cb.c,v 1.24 2017/09/25 01:56:22 ozaki-r Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/kmem.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/raw_cb.h>
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#include <netinet/in.h>
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/*
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* Routines to manage the raw protocol control blocks.
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*
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* TODO:
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* hash lookups by protocol family/protocol + address family
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* take care of unique address problems per AF?
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* redo address binding to allow wildcards
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*/
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static u_long raw_sendspace = RAWSNDQ;
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static u_long raw_recvspace = RAWRCVQ;
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/*
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* Allocate a nominal amount of buffer space for the socket.
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*/
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int
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raw_attach(struct socket *so, int proto, struct rawcbhead *rawcbhead)
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{
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struct rawcb *rp;
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int error;
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/*
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* It is assumed that raw_attach() is called after space has been
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* allocated for the rawcb; consumer protocols may simply allocate
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* type struct rawcb, or a wrapper data structure that begins with a
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* struct rawcb.
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*/
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rp = sotorawcb(so);
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KASSERT(rp != NULL);
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sosetlock(so);
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if ((error = soreserve(so, raw_sendspace, raw_recvspace)) != 0) {
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return error;
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}
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rp->rcb_socket = so;
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rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
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rp->rcb_proto.sp_protocol = proto;
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LIST_INSERT_HEAD(rawcbhead, rp, rcb_list);
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KASSERT(solocked(so));
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return 0;
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}
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/*
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* Detach the raw connection block and discard socket resources.
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*/
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void
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raw_detach(struct socket *so)
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{
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struct rawcb *rp = sotorawcb(so);
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const size_t rcb_len = rp->rcb_len;
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KASSERT(rp != NULL);
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KASSERT(solocked(so));
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/* Remove the last reference. */
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LIST_REMOVE(rp, rcb_list);
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so->so_pcb = NULL;
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/* Note: sofree() drops the socket's lock. */
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sofree(so);
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kmem_free(rp, rcb_len);
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if (so->so_lock != softnet_lock) {
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so->so_lock = softnet_lock;
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mutex_obj_hold(softnet_lock);
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}
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mutex_enter(softnet_lock);
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}
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/*
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* Disconnect and possibly release resources.
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*/
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void
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raw_disconnect(struct rawcb *rp)
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{
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struct socket *so = rp->rcb_socket;
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if (so->so_state & SS_NOFDREF) {
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raw_detach(so);
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}
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}
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