1/*- 2 * Copyright (c) 2003-2004 Benno Rice <benno@eloquent.com.au> 3 * All Rights Reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: stable/11/sys/netgraph/ng_atmllc.c 346817 2019-04-28 13:21:01Z dchagin $ 27 */ 28 29#include <sys/param.h> 30#include <sys/systm.h> 31#include <sys/kernel.h> 32#include <sys/malloc.h> 33#include <sys/mbuf.h> 34#include <sys/socket.h> 35#include <sys/sockio.h> 36 37#include <netgraph/ng_message.h> 38#include <netgraph/netgraph.h> 39#include <netgraph/ng_atmllc.h> 40 41#include <net/if.h> 42#include <net/ethernet.h> /* for M_HASFCS and ETHER_HDR_LEN */ 43#include <net/if_atm.h> /* for struct atmllc */ 44 45#define NG_ATMLLC_HEADER "\252\252\3\0\200\302" 46#define NG_ATMLLC_HEADER_LEN (sizeof(struct atmllc)) 47#define NG_ATMLLC_TYPE_ETHERNET_FCS 0x0001 48#define NG_ATMLLC_TYPE_FDDI_FCS 0x0004 49#define NG_ATMLLC_TYPE_ETHERNET_NOFCS 0x0007 50#define NG_ATMLLC_TYPE_FDDI_NOFCS 0x000A 51 52struct ng_atmllc_priv { 53 hook_p atm; 54 hook_p ether; 55 hook_p fddi; 56}; 57 58/* Netgraph methods. */ 59static ng_constructor_t ng_atmllc_constructor; 60static ng_shutdown_t ng_atmllc_shutdown; 61static ng_rcvmsg_t ng_atmllc_rcvmsg; 62static ng_newhook_t ng_atmllc_newhook; 63static ng_rcvdata_t ng_atmllc_rcvdata; 64static ng_disconnect_t ng_atmllc_disconnect; 65 66static struct ng_type ng_atmllc_typestruct = { 67 .version = NG_ABI_VERSION, 68 .name = NG_ATMLLC_NODE_TYPE, 69 .constructor = ng_atmllc_constructor, 70 .rcvmsg = ng_atmllc_rcvmsg, 71 .shutdown = ng_atmllc_shutdown, 72 .newhook = ng_atmllc_newhook, 73 .rcvdata = ng_atmllc_rcvdata, 74 .disconnect = ng_atmllc_disconnect, 75}; 76NETGRAPH_INIT(atmllc, &ng_atmllc_typestruct); 77 78static int 79ng_atmllc_constructor(node_p node) 80{ 81 struct ng_atmllc_priv *priv; 82 83 priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO); 84 NG_NODE_SET_PRIVATE(node, priv); 85 86 return (0); 87} 88 89static int 90ng_atmllc_rcvmsg(node_p node, item_p item, hook_p lasthook) 91{ 92 struct ng_mesg *msg; 93 int error; 94 95 error = 0; 96 NGI_GET_MSG(item, msg); 97 msg->header.flags |= NGF_RESP; 98 NG_RESPOND_MSG(error, node, item, msg); 99 return (error); 100} 101 102static int 103ng_atmllc_shutdown(node_p node) 104{ 105 struct ng_atmllc_priv *priv; 106 107 priv = NG_NODE_PRIVATE(node); 108 109 free(priv, M_NETGRAPH); 110 111 NG_NODE_UNREF(node); 112 113 return (0); 114} 115 116static int 117ng_atmllc_newhook(node_p node, hook_p hook, const char *name) 118{ 119 struct ng_atmllc_priv *priv; 120 121 priv = NG_NODE_PRIVATE(node); 122 123 if (strcmp(name, NG_ATMLLC_HOOK_ATM) == 0) { 124 if (priv->atm != NULL) { 125 return (EISCONN); 126 } 127 priv->atm = hook; 128 } else if (strcmp(name, NG_ATMLLC_HOOK_ETHER) == 0) { 129 if (priv->ether != NULL) { 130 return (EISCONN); 131 } 132 priv->ether = hook; 133 } else if (strcmp(name, NG_ATMLLC_HOOK_FDDI) == 0) { 134 if (priv->fddi != NULL) { 135 return (EISCONN); 136 } 137 priv->fddi = hook; 138 } else { 139 return (EINVAL); 140 } 141 142 return (0); 143} 144 145static int 146ng_atmllc_rcvdata(hook_p hook, item_p item) 147{ 148 struct ng_atmllc_priv *priv; 149 struct mbuf *m; 150 struct atmllc *hdr; 151 hook_p outhook; 152 u_int padding; 153 int error; 154 155 priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 156 NGI_GET_M(item, m); 157 outhook = NULL; 158 padding = 0; 159 160 if (hook == priv->atm) { 161 /* Ditch the pseudoheader. */ 162 hdr = mtod(m, struct atmllc *); 163 /* m_adj(m, sizeof(struct atm_pseudohdr)); */ 164 165 /* 166 * Make sure we have the LLC and ethernet headers. 167 * The ethernet header size is slightly larger than the FDDI 168 * header, which is convenient. 169 */ 170 if (m->m_len < sizeof(struct atmllc) + ETHER_HDR_LEN) { 171 m = m_pullup(m, sizeof(struct atmllc) + ETHER_HDR_LEN); 172 if (m == NULL) { 173 NG_FREE_ITEM(item); 174 return (ENOMEM); 175 } 176 } 177 178 /* Decode the LLC header. */ 179 hdr = mtod(m, struct atmllc *); 180 if (ATM_LLC_TYPE(hdr) == NG_ATMLLC_TYPE_ETHERNET_NOFCS) { 181 m->m_flags &= ~M_HASFCS; 182 outhook = priv->ether; 183 padding = 2; 184 } else if (ATM_LLC_TYPE(hdr) == NG_ATMLLC_TYPE_ETHERNET_FCS) { 185 m->m_flags |= M_HASFCS; 186 outhook = priv->ether; 187 padding = 2; 188 } else if (ATM_LLC_TYPE(hdr) == NG_ATMLLC_TYPE_FDDI_NOFCS) { 189 m->m_flags &= ~M_HASFCS; 190 outhook = priv->fddi; 191 padding = 3; 192 } else if (ATM_LLC_TYPE(hdr) == NG_ATMLLC_TYPE_FDDI_FCS) { 193 m->m_flags |= M_HASFCS; 194 outhook = priv->fddi; 195 padding = 3; 196 } else { 197 printf("ng_atmllc: unknown type: %x\n", 198 ATM_LLC_TYPE(hdr)); 199 } 200 201 /* Remove the LLC header and any padding*/ 202 m_adj(m, sizeof(struct atmllc) + padding); 203 } else if (hook == priv->ether) { 204 /* Add the LLC header */ 205 M_PREPEND(m, NG_ATMLLC_HEADER_LEN + 2, M_NOWAIT); 206 if (m == NULL) { 207 printf("ng_atmllc: M_PREPEND failed\n"); 208 NG_FREE_ITEM(item); 209 return (ENOMEM); 210 } 211 hdr = mtod(m, struct atmllc *); 212 bzero((void *)hdr, sizeof(struct atmllc) + 2); 213 bcopy(NG_ATMLLC_HEADER, hdr->llchdr, 6); 214 if ((m->m_flags & M_HASFCS) != 0) { 215 ATM_LLC_SETTYPE(hdr, NG_ATMLLC_TYPE_ETHERNET_FCS); 216 } else { 217 ATM_LLC_SETTYPE(hdr, NG_ATMLLC_TYPE_ETHERNET_NOFCS); 218 } 219 outhook = priv->atm; 220 } else if (hook == priv->fddi) { 221 /* Add the LLC header */ 222 M_PREPEND(m, NG_ATMLLC_HEADER_LEN + 3, M_NOWAIT); 223 if (m == NULL) { 224 printf("ng_atmllc: M_PREPEND failed\n"); 225 NG_FREE_ITEM(item); 226 return (ENOMEM); 227 } 228 hdr = mtod(m, struct atmllc *); 229 bzero((void *)hdr, sizeof(struct atmllc) + 3); 230 bcopy(NG_ATMLLC_HEADER, hdr->llchdr, 6); 231 if ((m->m_flags & M_HASFCS) != 0) { 232 ATM_LLC_SETTYPE(hdr, NG_ATMLLC_TYPE_FDDI_FCS); 233 } else { 234 ATM_LLC_SETTYPE(hdr, NG_ATMLLC_TYPE_FDDI_NOFCS); 235 } 236 outhook = priv->atm; 237 } 238 239 if (outhook == NULL) { 240 NG_FREE_M(m); 241 NG_FREE_ITEM(item); 242 return (0); 243 } 244 245 NG_FWD_NEW_DATA(error, item, outhook, m); 246 return (error); 247} 248 249static int 250ng_atmllc_disconnect(hook_p hook) 251{ 252 node_p node; 253 struct ng_atmllc_priv *priv; 254 255 node = NG_HOOK_NODE(hook); 256 priv = NG_NODE_PRIVATE(node); 257 258 if (hook == priv->atm) { 259 priv->atm = NULL; 260 } else if (hook == priv->ether) { 261 priv->ether = NULL; 262 } else if (hook == priv->fddi) { 263 priv->fddi = NULL; 264 } 265 266 if (NG_NODE_NUMHOOKS(node) == 0 && NG_NODE_IS_VALID(node)) { 267 ng_rmnode_self(node); 268 } 269 270 return (0); 271} 272