| 1 | /* $NetBSD: raw_cb.c,v 1.22 2014/05/21 20:43:56 rmind 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 1.22 2014/05/21 20:43:56 rmind 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 | |
| 60 | struct rawcbhead rawcb = LIST_HEAD_INITIALIZER(rawcb); |
| 61 | |
| 62 | static u_long raw_sendspace = RAWSNDQ; |
| 63 | static u_long raw_recvspace = RAWRCVQ; |
| 64 | |
| 65 | /* |
| 66 | * Allocate a nominal amount of buffer space for the socket. |
| 67 | */ |
| 68 | int |
| 69 | raw_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 | */ |
| 99 | void |
| 100 | raw_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 | KASSERT(so->so_lock == softnet_lock); /* XXX */ |
| 108 | |
| 109 | /* Remove the last reference. */ |
| 110 | LIST_REMOVE(rp, rcb_list); |
| 111 | so->so_pcb = NULL; |
| 112 | |
| 113 | /* Note: sofree() drops the socket's lock. */ |
| 114 | sofree(so); |
| 115 | kmem_free(rp, rcb_len); |
| 116 | mutex_enter(softnet_lock); |
| 117 | } |
| 118 | |
| 119 | /* |
| 120 | * Disconnect and possibly release resources. |
| 121 | */ |
| 122 | void |
| 123 | raw_disconnect(struct rawcb *rp) |
| 124 | { |
| 125 | struct socket *so = rp->rcb_socket; |
| 126 | |
| 127 | if (so->so_state & SS_NOFDREF) { |
| 128 | raw_detach(so); |
| 129 | } |
| 130 | } |
| 131 | |