raw_cb.c revision 185571
1/*- 2 * Copyright (c) 1980, 1986, 1993 3 * The Regents of the University of California. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 4. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * @(#)raw_cb.c 8.1 (Berkeley) 6/10/93 31 * $FreeBSD: head/sys/net/raw_cb.c 185571 2008-12-02 21:37:28Z bz $ 32 */ 33 34#include <sys/param.h> 35#include <sys/domain.h> 36#include <sys/lock.h> 37#include <sys/kernel.h> 38#include <sys/malloc.h> 39#include <sys/mutex.h> 40#include <sys/protosw.h> 41#include <sys/socket.h> 42#include <sys/socketvar.h> 43#include <sys/sysctl.h> 44#include <sys/systm.h> 45#include <sys/vimage.h> 46 47#include <net/if.h> 48#include <net/raw_cb.h> 49#include <net/vnet.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 mtx rawcb_mtx; 61#ifdef VIMAGE_GLOBALS 62struct rawcb_list_head rawcb_list; 63#endif 64 65SYSCTL_NODE(_net, OID_AUTO, raw, CTLFLAG_RW, 0, "Raw socket infrastructure"); 66 67static u_long raw_sendspace = RAWSNDQ; 68SYSCTL_ULONG(_net_raw, OID_AUTO, sendspace, CTLFLAG_RW, &raw_sendspace, 0, 69 "Default raw socket send space"); 70 71static u_long raw_recvspace = RAWRCVQ; 72SYSCTL_ULONG(_net_raw, OID_AUTO, recvspace, CTLFLAG_RW, &raw_recvspace, 0, 73 "Default raw socket receive space"); 74 75/* 76 * Allocate a control block and a nominal amount of buffer space for the 77 * socket. 78 */ 79int 80raw_attach(struct socket *so, int proto) 81{ 82 INIT_VNET_NET(so->so_vnet); 83 struct rawcb *rp = sotorawcb(so); 84 int error; 85 86 /* 87 * It is assumed that raw_attach is called after space has been 88 * allocated for the rawcb; consumer protocols may simply allocate 89 * type struct rawcb, or a wrapper data structure that begins with a 90 * struct rawcb. 91 */ 92 KASSERT(rp != NULL, ("raw_attach: rp == NULL")); 93 94 error = soreserve(so, raw_sendspace, raw_recvspace); 95 if (error) 96 return (error); 97 rp->rcb_socket = so; 98 rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family; 99 rp->rcb_proto.sp_protocol = proto; 100 mtx_lock(&rawcb_mtx); 101 LIST_INSERT_HEAD(&V_rawcb_list, rp, list); 102 mtx_unlock(&rawcb_mtx); 103 return (0); 104} 105 106/* 107 * Detach the raw connection block and discard socket resources. 108 */ 109void 110raw_detach(struct rawcb *rp) 111{ 112 struct socket *so = rp->rcb_socket; 113 114 KASSERT(so->so_pcb == rp, ("raw_detach: so_pcb != rp")); 115 116 so->so_pcb = NULL; 117 mtx_lock(&rawcb_mtx); 118 LIST_REMOVE(rp, list); 119 mtx_unlock(&rawcb_mtx); 120 free((caddr_t)(rp), M_PCB); 121} 122