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 60struct rawcbhead rawcb = LIST_HEAD_INITIALIZER(rawcb); 61 62static u_long raw_sendspace = RAWSNDQ; 63static u_long raw_recvspace = RAWRCVQ; 64 65/* 66 * Allocate a nominal amount of buffer space for the socket. 67 */ 68int 69raw_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 */ 99void 100raw_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 */ 125void 126raw_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