1 /* 2 * ng_ip_input.c 3 * 4 * Copyright 2001 The Aerospace Corporation. 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 * 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. The name of The Aerospace Corporation may not be used to endorse or 16 * promote products derived from this software. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION "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 AEROSPACE CORPORATION 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 * Copyright (c) 1996-1999 Whistle Communications, Inc. 31 * All rights reserved. 32 * 33 * Subject to the following obligations and disclaimer of warranty, use and 34 * redistribution of this software, in source or object code forms, with or 35 * without modifications are expressly permitted by Whistle Communications; 36 * provided, however, that: 37 * 1. Any and all reproductions of the source or object code must include the 38 * copyright notice above and the following disclaimer of warranties; and 39 * 2. No rights are granted, in any manner or form, to use Whistle 40 * Communications, Inc. trademarks, including the mark "WHISTLE 41 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 42 * such appears in the above copyright notice or in the software. 43 * 44 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 45 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 46 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 47 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 48 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 49 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 50 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 51 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 52 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 53 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 54 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 55 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 56 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 57 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 58 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 59 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 60 * OF SUCH DAMAGE. 61 * 62 * Author: Brooks Davis <brooks@FreeBSD.org> 63 * Derived from: ng_hole.c 64 * 65 * $FreeBSD$ 66 */ 67 68 /* 69 * This node simply takes IP packets and calls ip_input on them 70 */ 71 72 #include <sys/param.h> 73 #include <sys/systm.h> 74 #include <sys/kernel.h> 75 #include <sys/malloc.h> 76 #include <sys/mbuf.h> 77 #include <sys/socket.h> 78 #include <net/if.h> 79 #include <net/if_types.h> 80 #include <net/if_var.h> 81 #include <netinet/in.h> 82 #include <netinet/in_var.h> 83 #include <net/netisr.h> 84 #include <netgraph/ng_message.h> 85 #include <netgraph/netgraph.h> 86 #include <netgraph/ng_ip_input.h> 87 88 /* Netgraph methods */ 89 static ng_constructor_t ngipi_cons; 90 static ng_rcvdata_t ngipi_rcvdata; 91 static ng_disconnect_t ngipi_disconnect; 92 93 static struct ng_type typestruct = { 94 NG_ABI_VERSION, 95 NG_IP_INPUT_NODE_TYPE, 96 NULL, /* modeventhand_t */ 97 ngipi_cons, /* ng_constructor_t */ 98 NULL, /* ng_rcvmsg_t */ 99 NULL, /* ng_shutdown_t */ 100 NULL, /* ng_newhook_t */ 101 NULL, /* ng_findhook_t */ 102 NULL, /* ng_connect_t */ 103 ngipi_rcvdata, /* ng_rcvdata_t */ 104 ngipi_disconnect, /* ng_disconnect_t */ 105 NULL /* ng_cmdlist */ 106 }; 107 NETGRAPH_INIT(ip_input, &typestruct); 108 109 /* 110 * Be obliging. but no work to do. 111 */ 112 static int 113 ngipi_cons(node_p node) 114 { 115 return(0); 116 } 117 118 /* 119 * Receive data 120 */ 121 static int 122 ngipi_rcvdata(hook_p hook, item_p item) 123 { 124 struct mbuf *m; 125 126 NGI_GET_M(item, m); 127 NG_FREE_ITEM(item); 128 netisr_dispatch(NETISR_IP, m); 129 return 0; 130 } 131 132 /* 133 * Hook disconnection 134 */ 135 static int 136 ngipi_disconnect(hook_p hook) 137 { 138 if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 139 ng_rmnode_self(NG_HOOK_NODE(hook)); 140 return (0); 141 } 142