1 2/* 3 * ng_UI.c 4 * 5 * Copyright (c) 1996-1999 Whistle Communications, Inc. 6 * All rights reserved. 7 * 8 * Subject to the following obligations and disclaimer of warranty, use and 9 * redistribution of this software, in source or object code forms, with or 10 * without modifications are expressly permitted by Whistle Communications; 11 * provided, however, that: 12 * 1. Any and all reproductions of the source or object code must include the 13 * copyright notice above and the following disclaimer of warranties; and 14 * 2. No rights are granted, in any manner or form, to use Whistle 15 * Communications, Inc. trademarks, including the mark "WHISTLE 16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17 * such appears in the above copyright notice or in the software. 18 * 19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35 * OF SUCH DAMAGE. 36 * 37 * Author: Julian Elischer <julian@whistle.com> 38 *
| 1 2/* 3 * ng_UI.c 4 * 5 * Copyright (c) 1996-1999 Whistle Communications, Inc. 6 * All rights reserved. 7 * 8 * Subject to the following obligations and disclaimer of warranty, use and 9 * redistribution of this software, in source or object code forms, with or 10 * without modifications are expressly permitted by Whistle Communications; 11 * provided, however, that: 12 * 1. Any and all reproductions of the source or object code must include the 13 * copyright notice above and the following disclaimer of warranties; and 14 * 2. No rights are granted, in any manner or form, to use Whistle 15 * Communications, Inc. trademarks, including the mark "WHISTLE 16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17 * such appears in the above copyright notice or in the software. 18 * 19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35 * OF SUCH DAMAGE. 36 * 37 * Author: Julian Elischer <julian@whistle.com> 38 *
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39 * $FreeBSD: head/sys/netgraph/ng_UI.c 54249 1999-12-07 05:50:48Z julian $
| 39 * $FreeBSD: head/sys/netgraph/ng_UI.c 59728 2000-04-28 17:09:00Z julian $
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40 * $Whistle: ng_UI.c,v 1.14 1999/11/01 09:24:51 julian Exp $ 41 */ 42 43#include <sys/param.h> 44#include <sys/systm.h> 45#include <sys/errno.h> 46#include <sys/kernel.h> 47#include <sys/malloc.h> 48#include <sys/mbuf.h> 49#include <sys/errno.h> 50 51 52#include <netgraph/ng_message.h> 53#include <netgraph/netgraph.h> 54#include <netgraph/ng_UI.h> 55 56/* 57 * DEFINITIONS 58 */ 59 60/* Everything, starting with sdlc on has defined UI as 0x03 */ 61#define HDLC_UI 0x03 62 63/* Node private data */ 64struct ng_UI_private { 65 hook_p downlink; 66 hook_p uplink; 67}; 68typedef struct ng_UI_private *priv_p; 69 70/* Netgraph node methods */ 71static ng_constructor_t ng_UI_constructor; 72static ng_rcvmsg_t ng_UI_rcvmsg; 73static ng_shutdown_t ng_UI_rmnode; 74static ng_newhook_t ng_UI_newhook; 75static ng_rcvdata_t ng_UI_rcvdata; 76static ng_disconnect_t ng_UI_disconnect; 77 78/* Node type descriptor */ 79static struct ng_type typestruct = { 80 NG_VERSION, 81 NG_UI_NODE_TYPE, 82 NULL, 83 ng_UI_constructor, 84 ng_UI_rcvmsg, 85 ng_UI_rmnode, 86 ng_UI_newhook, 87 NULL, 88 NULL, 89 ng_UI_rcvdata, 90 ng_UI_rcvdata, 91 ng_UI_disconnect, 92 NULL 93}; 94NETGRAPH_INIT(UI, &typestruct); 95 96/************************************************************************ 97 NETGRAPH NODE STUFF 98 ************************************************************************/ 99 100/* 101 * Create a newborn node. We start with an implicit reference. 102 */ 103 104static int 105ng_UI_constructor(node_p *nodep) 106{ 107 priv_p priv; 108 int error; 109 110 /* Allocate private structure */ 111 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_WAITOK); 112 if (priv == NULL) 113 return (ENOMEM); 114 bzero(priv, sizeof(*priv)); 115 116 /* Call generic node constructor */ 117 if ((error = ng_make_node_common(&typestruct, nodep))) { 118 FREE(priv, M_NETGRAPH); 119 return (error); 120 } 121 (*nodep)->private = priv; 122 123 /* Done */ 124 return (0); 125} 126 127/* 128 * Give our ok for a hook to be added 129 */ 130static int 131ng_UI_newhook(node_p node, hook_p hook, const char *name) 132{ 133 const priv_p priv = node->private; 134 135 if (!strcmp(name, NG_UI_HOOK_DOWNSTREAM)) { 136 if (priv->downlink) 137 return (EISCONN); 138 priv->downlink = hook; 139 } else if (!strcmp(name, NG_UI_HOOK_UPSTREAM)) { 140 if (priv->uplink) 141 return (EISCONN); 142 priv->uplink = hook; 143 } else 144 return (EINVAL); 145 return (0); 146} 147 148/* 149 * Receive a control message 150 */ 151static int 152ng_UI_rcvmsg(node_p node, struct ng_mesg *msg,
| 40 * $Whistle: ng_UI.c,v 1.14 1999/11/01 09:24:51 julian Exp $ 41 */ 42 43#include <sys/param.h> 44#include <sys/systm.h> 45#include <sys/errno.h> 46#include <sys/kernel.h> 47#include <sys/malloc.h> 48#include <sys/mbuf.h> 49#include <sys/errno.h> 50 51 52#include <netgraph/ng_message.h> 53#include <netgraph/netgraph.h> 54#include <netgraph/ng_UI.h> 55 56/* 57 * DEFINITIONS 58 */ 59 60/* Everything, starting with sdlc on has defined UI as 0x03 */ 61#define HDLC_UI 0x03 62 63/* Node private data */ 64struct ng_UI_private { 65 hook_p downlink; 66 hook_p uplink; 67}; 68typedef struct ng_UI_private *priv_p; 69 70/* Netgraph node methods */ 71static ng_constructor_t ng_UI_constructor; 72static ng_rcvmsg_t ng_UI_rcvmsg; 73static ng_shutdown_t ng_UI_rmnode; 74static ng_newhook_t ng_UI_newhook; 75static ng_rcvdata_t ng_UI_rcvdata; 76static ng_disconnect_t ng_UI_disconnect; 77 78/* Node type descriptor */ 79static struct ng_type typestruct = { 80 NG_VERSION, 81 NG_UI_NODE_TYPE, 82 NULL, 83 ng_UI_constructor, 84 ng_UI_rcvmsg, 85 ng_UI_rmnode, 86 ng_UI_newhook, 87 NULL, 88 NULL, 89 ng_UI_rcvdata, 90 ng_UI_rcvdata, 91 ng_UI_disconnect, 92 NULL 93}; 94NETGRAPH_INIT(UI, &typestruct); 95 96/************************************************************************ 97 NETGRAPH NODE STUFF 98 ************************************************************************/ 99 100/* 101 * Create a newborn node. We start with an implicit reference. 102 */ 103 104static int 105ng_UI_constructor(node_p *nodep) 106{ 107 priv_p priv; 108 int error; 109 110 /* Allocate private structure */ 111 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_WAITOK); 112 if (priv == NULL) 113 return (ENOMEM); 114 bzero(priv, sizeof(*priv)); 115 116 /* Call generic node constructor */ 117 if ((error = ng_make_node_common(&typestruct, nodep))) { 118 FREE(priv, M_NETGRAPH); 119 return (error); 120 } 121 (*nodep)->private = priv; 122 123 /* Done */ 124 return (0); 125} 126 127/* 128 * Give our ok for a hook to be added 129 */ 130static int 131ng_UI_newhook(node_p node, hook_p hook, const char *name) 132{ 133 const priv_p priv = node->private; 134 135 if (!strcmp(name, NG_UI_HOOK_DOWNSTREAM)) { 136 if (priv->downlink) 137 return (EISCONN); 138 priv->downlink = hook; 139 } else if (!strcmp(name, NG_UI_HOOK_UPSTREAM)) { 140 if (priv->uplink) 141 return (EISCONN); 142 priv->uplink = hook; 143 } else 144 return (EINVAL); 145 return (0); 146} 147 148/* 149 * Receive a control message 150 */ 151static int 152ng_UI_rcvmsg(node_p node, struct ng_mesg *msg,
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153 const char *raddr, struct ng_mesg **rp)
| 153 const char *raddr, struct ng_mesg **rp, hook_p lasthook)
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154{ 155 FREE(msg, M_NETGRAPH); 156 return (EINVAL); 157} 158 159#define MAX_ENCAPS_HDR 1 160#define ERROUT(x) do { error = (x); goto done; } while (0) 161 162/* 163 * Receive a data frame 164 */ 165static int
| 154{ 155 FREE(msg, M_NETGRAPH); 156 return (EINVAL); 157} 158 159#define MAX_ENCAPS_HDR 1 160#define ERROUT(x) do { error = (x); goto done; } while (0) 161 162/* 163 * Receive a data frame 164 */ 165static int
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166ng_UI_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
| 166ng_UI_rcvdata(hook_p hook, struct mbuf *m, meta_p meta, 167 struct mbuf **ret_m, meta_p *ret_meta)
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167{ 168 const node_p node = hook->node; 169 const priv_p priv = node->private; 170 int error = 0; 171 172 if (hook == priv->downlink) { 173 u_char *start, *ptr; 174 175 if (!m || (m->m_len < MAX_ENCAPS_HDR 176 && !(m = m_pullup(m, MAX_ENCAPS_HDR)))) 177 ERROUT(ENOBUFS); 178 ptr = start = mtod(m, u_char *); 179 180 /* Must be UI frame */ 181 if (*ptr++ != HDLC_UI) 182 ERROUT(0); 183 184 m_adj(m, ptr - start); 185 NG_SEND_DATA(error, priv->uplink, m, meta); /* m -> NULL */ 186 } else if (hook == priv->uplink) { 187 M_PREPEND(m, 1, M_DONTWAIT); /* Prepend IP NLPID */ 188 if (!m) 189 ERROUT(ENOBUFS); 190 mtod(m, u_char *)[0] = HDLC_UI; 191 NG_SEND_DATA(error, priv->downlink, m, meta); /* m -> NULL */ 192 } else 193 panic(__FUNCTION__); 194 195done: 196 NG_FREE_DATA(m, meta); /* does nothing if m == NULL */ 197 return (error); 198} 199 200/* 201 * Shutdown node 202 */ 203static int 204ng_UI_rmnode(node_p node) 205{ 206 const priv_p priv = node->private; 207 208 /* Take down netgraph node */ 209 node->flags |= NG_INVALID; 210 ng_cutlinks(node); 211 ng_unname(node); 212 bzero(priv, sizeof(*priv)); 213 FREE(priv, M_NETGRAPH); 214 node->private = NULL; 215 ng_unref(node); 216 return (0); 217} 218 219/* 220 * Hook disconnection 221 */ 222static int 223ng_UI_disconnect(hook_p hook) 224{ 225 const priv_p priv = hook->node->private; 226 227 if (hook->node->numhooks == 0) 228 ng_rmnode(hook->node); 229 else if (hook == priv->downlink) 230 priv->downlink = NULL; 231 else if (hook == priv->uplink) 232 priv->uplink = NULL; 233 else 234 panic(__FUNCTION__); 235 return (0); 236} 237
| 168{ 169 const node_p node = hook->node; 170 const priv_p priv = node->private; 171 int error = 0; 172 173 if (hook == priv->downlink) { 174 u_char *start, *ptr; 175 176 if (!m || (m->m_len < MAX_ENCAPS_HDR 177 && !(m = m_pullup(m, MAX_ENCAPS_HDR)))) 178 ERROUT(ENOBUFS); 179 ptr = start = mtod(m, u_char *); 180 181 /* Must be UI frame */ 182 if (*ptr++ != HDLC_UI) 183 ERROUT(0); 184 185 m_adj(m, ptr - start); 186 NG_SEND_DATA(error, priv->uplink, m, meta); /* m -> NULL */ 187 } else if (hook == priv->uplink) { 188 M_PREPEND(m, 1, M_DONTWAIT); /* Prepend IP NLPID */ 189 if (!m) 190 ERROUT(ENOBUFS); 191 mtod(m, u_char *)[0] = HDLC_UI; 192 NG_SEND_DATA(error, priv->downlink, m, meta); /* m -> NULL */ 193 } else 194 panic(__FUNCTION__); 195 196done: 197 NG_FREE_DATA(m, meta); /* does nothing if m == NULL */ 198 return (error); 199} 200 201/* 202 * Shutdown node 203 */ 204static int 205ng_UI_rmnode(node_p node) 206{ 207 const priv_p priv = node->private; 208 209 /* Take down netgraph node */ 210 node->flags |= NG_INVALID; 211 ng_cutlinks(node); 212 ng_unname(node); 213 bzero(priv, sizeof(*priv)); 214 FREE(priv, M_NETGRAPH); 215 node->private = NULL; 216 ng_unref(node); 217 return (0); 218} 219 220/* 221 * Hook disconnection 222 */ 223static int 224ng_UI_disconnect(hook_p hook) 225{ 226 const priv_p priv = hook->node->private; 227 228 if (hook->node->numhooks == 0) 229 ng_rmnode(hook->node); 230 else if (hook == priv->downlink) 231 priv->downlink = NULL; 232 else if (hook == priv->uplink) 233 priv->uplink = NULL; 234 else 235 panic(__FUNCTION__); 236 return (0); 237} 238
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