raw_cb.c revision 1.24
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 60static u_long raw_sendspace = RAWSNDQ; 61static u_long raw_recvspace = RAWRCVQ; 62 63/* 64 * Allocate a nominal amount of buffer space for the socket. 65 */ 66int 67raw_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 */ 97void 98raw_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 */ 123void 124raw_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