raw_cb.c revision 195699
1193326Sed/*- 2193326Sed * Copyright (c) 1980, 1986, 1993 3193326Sed * The Regents of the University of California. 4193326Sed * All rights reserved. 5193326Sed * 6193326Sed * Redistribution and use in source and binary forms, with or without 7193326Sed * modification, are permitted provided that the following conditions 8193326Sed * are met: 9193326Sed * 1. Redistributions of source code must retain the above copyright 10193326Sed * notice, this list of conditions and the following disclaimer. 11193326Sed * 2. Redistributions in binary form must reproduce the above copyright 12193326Sed * notice, this list of conditions and the following disclaimer in the 13193326Sed * documentation and/or other materials provided with the distribution. 14193326Sed * 4. Neither the name of the University nor the names of its contributors 15193326Sed * may be used to endorse or promote products derived from this software 16193326Sed * without specific prior written permission. 17193326Sed * 18193326Sed * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19193326Sed * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20193326Sed * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21195341Sed * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22193326Sed * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23193326Sed * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24193326Sed * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25193326Sed * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26193326Sed * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27193326Sed * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28193326Sed * SUCH DAMAGE. 29198092Srdivacky * 30193326Sed * @(#)raw_cb.c 8.1 (Berkeley) 6/10/93 31193326Sed * $FreeBSD: head/sys/net/raw_cb.c 195699 2009-07-14 22:48:30Z rwatson $ 32193326Sed */ 33198092Srdivacky 34193326Sed#include <sys/param.h> 35198092Srdivacky#include <sys/domain.h> 36193326Sed#include <sys/lock.h> 37193326Sed#include <sys/kernel.h> 38195341Sed#include <sys/malloc.h> 39195341Sed#include <sys/mutex.h> 40193326Sed#include <sys/protosw.h> 41193326Sed#include <sys/socket.h> 42193326Sed#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; 61VNET_DEFINE(struct rawcb_list_head, rawcb_list); 62 63SYSCTL_NODE(_net, OID_AUTO, raw, CTLFLAG_RW, 0, "Raw socket infrastructure"); 64 65static u_long raw_sendspace = RAWSNDQ; 66SYSCTL_ULONG(_net_raw, OID_AUTO, sendspace, CTLFLAG_RW, &raw_sendspace, 0, 67 "Default raw socket send space"); 68 69static u_long raw_recvspace = RAWRCVQ; 70SYSCTL_ULONG(_net_raw, OID_AUTO, recvspace, CTLFLAG_RW, &raw_recvspace, 0, 71 "Default raw socket receive space"); 72 73/* 74 * Allocate a control block and a nominal amount of buffer space for the 75 * socket. 76 */ 77int 78raw_attach(struct socket *so, int proto) 79{ 80 struct rawcb *rp = sotorawcb(so); 81 int error; 82 83 /* 84 * It is assumed that raw_attach is called after space has been 85 * allocated for the rawcb; consumer protocols may simply allocate 86 * type struct rawcb, or a wrapper data structure that begins with a 87 * struct rawcb. 88 */ 89 KASSERT(rp != NULL, ("raw_attach: rp == NULL")); 90 91 error = soreserve(so, raw_sendspace, raw_recvspace); 92 if (error) 93 return (error); 94 rp->rcb_socket = so; 95 rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family; 96 rp->rcb_proto.sp_protocol = proto; 97 mtx_lock(&rawcb_mtx); 98 LIST_INSERT_HEAD(&V_rawcb_list, rp, list); 99 mtx_unlock(&rawcb_mtx); 100 return (0); 101} 102 103/* 104 * Detach the raw connection block and discard socket resources. 105 */ 106void 107raw_detach(struct rawcb *rp) 108{ 109 struct socket *so = rp->rcb_socket; 110 111 KASSERT(so->so_pcb == rp, ("raw_detach: so_pcb != rp")); 112 113 so->so_pcb = NULL; 114 mtx_lock(&rawcb_mtx); 115 LIST_REMOVE(rp, list); 116 mtx_unlock(&rawcb_mtx); 117 free((caddr_t)(rp), M_PCB); 118} 119