1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1986, 1993 5 * The Regents of the University of California. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)raw_cb.c 8.1 (Berkeley) 6/10/93 33 * $FreeBSD$ 34 */ 35 36 #include <sys/param.h> 37 #include <sys/domain.h> 38 #include <sys/lock.h> 39 #include <sys/kernel.h> 40 #include <sys/malloc.h> 41 #include <sys/mutex.h> 42 #include <sys/protosw.h> 43 #include <sys/socket.h> 44 #include <sys/socketvar.h> 45 #include <sys/sysctl.h> 46 #include <sys/systm.h> 47 48 #include <net/if.h> 49 #include <net/vnet.h> 50 #include <net/raw_cb.h> 51 52 /* 53 * Routines to manage the raw protocol control blocks. 54 * 55 * TODO: 56 * hash lookups by protocol family/protocol + address family 57 * take care of unique address problems per AF? 58 * redo address binding to allow wildcards 59 */ 60 61 struct mtx rawcb_mtx; 62 VNET_DEFINE(struct rawcb_list_head, rawcb_list); 63 64 static SYSCTL_NODE(_net, OID_AUTO, raw, CTLFLAG_RW, 0, 65 "Raw socket infrastructure"); 66 67 static u_long raw_sendspace = RAWSNDQ; 68 SYSCTL_ULONG(_net_raw, OID_AUTO, sendspace, CTLFLAG_RW, &raw_sendspace, 0, 69 "Default raw socket send space"); 70 71 static u_long raw_recvspace = RAWRCVQ; 72 SYSCTL_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 */ 79 int 80 raw_attach(struct socket *so, int proto) 81 { 82 struct rawcb *rp = sotorawcb(so); 83 int error; 84 85 /* 86 * It is assumed that raw_attach is called after space has been 87 * allocated for the rawcb; consumer protocols may simply allocate 88 * type struct rawcb, or a wrapper data structure that begins with a 89 * struct rawcb. 90 */ 91 KASSERT(rp != NULL, ("raw_attach: rp == NULL")); 92 93 error = soreserve(so, raw_sendspace, raw_recvspace); 94 if (error) 95 return (error); 96 rp->rcb_socket = so; 97 rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family; 98 rp->rcb_proto.sp_protocol = proto; 99 mtx_lock(&rawcb_mtx); 100 LIST_INSERT_HEAD(&V_rawcb_list, rp, list); 101 mtx_unlock(&rawcb_mtx); 102 return (0); 103 } 104 105 /* 106 * Detach the raw connection block and discard socket resources. 107 */ 108 void 109 raw_detach(struct rawcb *rp) 110 { 111 struct socket *so = rp->rcb_socket; 112 113 KASSERT(so->so_pcb == rp, ("raw_detach: so_pcb != rp")); 114 115 so->so_pcb = NULL; 116 mtx_lock(&rawcb_mtx); 117 LIST_REMOVE(rp, list); 118 mtx_unlock(&rawcb_mtx); 119 free((caddr_t)(rp), M_PCB); 120 } 121