sys/netgraph7/ng_atmllc.c

   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: src/sys/netgraph/ng_atmllc.c,v 1.3 2005/01/07 01:45:39 imp Exp $
  27  * $DragonFly: src/sys/netgraph7/ng_atmllc.c,v 1.2 2008/06/26 23:05:35 dillon Exp $
  28  */
  29
  30 #include <sys/param.h>
  31 #include <sys/systm.h>
  32 #include <sys/kernel.h>
  33 #include <sys/malloc.h>
  34 #include <sys/mbuf.h>
  35 #include <sys/socket.h>
  36 #include <sys/sockio.h>
  37
  38 #include "ng_message.h"
  39 #include "netgraph.h"
  40 #include "ng_atmllc.h"
  41
  42 #include <net/if.h>
  43 #include <net/ethernet.h>       /* for M_HASFCS and ETHER_HDR_LEN */
  44 #include <net/if_atm.h>         /* for struct atmllc */
  45
  46 #define NG_ATMLLC_HEADER                "\252\252\3\0\200\302"
  47 #define NG_ATMLLC_HEADER_LEN            (sizeof(struct atmllc))
  48 #define NG_ATMLLC_TYPE_ETHERNET_FCS     0x0001
  49 #define NG_ATMLLC_TYPE_FDDI_FCS         0x0004
  50 #define NG_ATMLLC_TYPE_ETHERNET_NOFCS   0x0007
  51 #define NG_ATMLLC_TYPE_FDDI_NOFCS       0x000A
  52
  53 struct ng_atmllc_priv {
  54         hook_p          atm;
  55         hook_p          ether;
  56         hook_p          fddi;
  57 };
  58
  59 /* Netgraph methods. */
  60 static ng_constructor_t         ng_atmllc_constructor;
  61 static ng_shutdown_t            ng_atmllc_shutdown;
  62 static ng_rcvmsg_t              ng_atmllc_rcvmsg;
  63 static ng_newhook_t             ng_atmllc_newhook;
  64 static ng_rcvdata_t             ng_atmllc_rcvdata;
  65 static ng_disconnect_t          ng_atmllc_disconnect;
  66
  67 static struct ng_type ng_atmllc_typestruct = {
  68         .version =      NG_ABI_VERSION,
  69         .name =         NG_ATMLLC_NODE_TYPE,
  70         .constructor =  ng_atmllc_constructor,
  71         .rcvmsg =       ng_atmllc_rcvmsg,
  72         .shutdown =     ng_atmllc_shutdown,
  73         .newhook =      ng_atmllc_newhook,
  74         .rcvdata =      ng_atmllc_rcvdata,
  75         .disconnect =   ng_atmllc_disconnect,
  76 };
  77 NETGRAPH_INIT(atmllc, &ng_atmllc_typestruct);
  78
  79 static int
  80 ng_atmllc_constructor(node_p node)
  81 {
  82         struct  ng_atmllc_priv *priv;
  83
  84         MALLOC(priv, struct ng_atmllc_priv *, sizeof(*priv), M_NETGRAPH,
  85             M_WAITOK | M_NULLOK | M_ZERO);
  86         if (priv == NULL) {
  87                 return (ENOMEM);
  88         }
  89
  90         NG_NODE_SET_PRIVATE(node, priv);
  91
  92         return (0);
  93 }
  94
  95 static int
  96 ng_atmllc_rcvmsg(node_p node, item_p item, hook_p lasthook)
  97 {
  98         struct  ng_mesg *msg;
  99         int     error;
 100
 101         error = 0;
 102         NGI_GET_MSG(item, msg);
 103         msg->header.flags |= NGF_RESP;
 104         NG_RESPOND_MSG(error, node, item, msg);
 105         return (error);
 106 }
 107
 108 static int
 109 ng_atmllc_shutdown(node_p node)
 110 {
 111         struct  ng_atmllc_priv *priv;
 112
 113         priv = NG_NODE_PRIVATE(node);
 114
 115         FREE(priv, M_NETGRAPH);
 116
 117         NG_NODE_UNREF(node);
 118
 119         return (0);
 120 }
 121
 122 static int
 123 ng_atmllc_newhook(node_p node, hook_p hook, const char *name)
 124 {
 125         struct  ng_atmllc_priv *priv;
 126
 127         priv = NG_NODE_PRIVATE(node);
 128
 129         if (strcmp(name, NG_ATMLLC_HOOK_ATM) == 0) {
 130                 if (priv->atm != NULL) {
 131                         return (EISCONN);
 132                 }
 133                 priv->atm = hook;
 134         } else if (strcmp(name, NG_ATMLLC_HOOK_ETHER) == 0) {
 135                 if (priv->ether != NULL) {
 136                         return (EISCONN);
 137                 }
 138                 priv->ether = hook;
 139         } else if (strcmp(name, NG_ATMLLC_HOOK_FDDI) == 0) {
 140                 if (priv->fddi != NULL) {
 141                         return (EISCONN);
 142                 }
 143                 priv->fddi = hook;
 144         } else {
 145                 return (EINVAL);
 146         }
 147
 148         return (0);
 149 }
 150
 151 static int
 152 ng_atmllc_rcvdata(hook_p hook, item_p item)
 153 {
 154         struct  ng_atmllc_priv *priv;
 155         struct  mbuf *m;
 156         struct  atmllc *hdr;
 157         hook_p  outhook;
 158         u_int   padding;
 159         int     error;
 160
 161         priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 162         m = NGI_M(item);
 163         outhook = NULL;
 164         padding = 0;
 165
 166         if (hook == priv->atm) {
 167                 /* Ditch the psuedoheader. */
 168                 hdr = mtod(m, struct atmllc *);
 169                 /* m_adj(m, sizeof(struct atm_pseudohdr)); */
 170
 171                 /*
 172                  * Make sure we have the LLC and ethernet headers.
 173                  * The ethernet header size is slightly larger than the FDDI
 174                  * header, which is convenient.
 175                  */
 176                 if (m->m_len < sizeof(struct atmllc) + ETHER_HDR_LEN) {
 177                         m = m_pullup(m, sizeof(struct atmllc) + ETHER_HDR_LEN);
 178                         if (m == NULL) {
 179                                 return (ENOMEM);
 180                         }
 181                 }
 182
 183                 /* Decode the LLC header. */
 184                 hdr = mtod(m, struct atmllc *);
 185                 if (ATM_LLC_TYPE(hdr) == NG_ATMLLC_TYPE_ETHERNET_NOFCS) {
 186                         m->m_flags &= ~M_HASFCS;
 187                         outhook = priv->ether;
 188                         padding = 2;
 189                 } else if (ATM_LLC_TYPE(hdr) == NG_ATMLLC_TYPE_ETHERNET_FCS) {
 190                         m->m_flags |= M_HASFCS;
 191                         outhook = priv->ether;
 192                         padding = 2;
 193                 } else if (ATM_LLC_TYPE(hdr) == NG_ATMLLC_TYPE_FDDI_NOFCS) {
 194                         m->m_flags &= ~M_HASFCS;
 195                         outhook = priv->fddi;
 196                         padding = 3;
 197                 } else if (ATM_LLC_TYPE(hdr) == NG_ATMLLC_TYPE_FDDI_FCS) {
 198                         m->m_flags |= M_HASFCS;
 199                         outhook = priv->fddi;
 200                         padding = 3;
 201                 } else {
 202                         printf("ng_atmllc: unknown type: %x\n",
 203                             ATM_LLC_TYPE(hdr));
 204                 }
 205
 206                 /* Remove the LLC header and any padding*/
 207                 m_adj(m, sizeof(struct atmllc) + padding);
 208         } else if (hook == priv->ether) {
 209                 /* Add the LLC header */
 210                 M_PREPEND(m, NG_ATMLLC_HEADER_LEN + 2, MB_DONTWAIT);
 211                 if (m == NULL) {
 212                         printf("ng_atmllc: M_PREPEND failed\n");
 213                         NG_FREE_ITEM(item);
 214                         return (ENOMEM);
 215                 }
 216                 hdr = mtod(m, struct atmllc *);
 217                 bzero((void *)hdr, sizeof(struct atmllc) + 2);
 218                 bcopy(NG_ATMLLC_HEADER, hdr->llchdr, 6);
 219                 if ((m->m_flags & M_HASFCS) != 0) {
 220                         ATM_LLC_SETTYPE(hdr, NG_ATMLLC_TYPE_ETHERNET_FCS);
 221                 } else {
 222                         ATM_LLC_SETTYPE(hdr, NG_ATMLLC_TYPE_ETHERNET_NOFCS);
 223                 }
 224                 outhook = priv->atm;
 225         } else if (hook == priv->fddi) {
 226                 /* Add the LLC header */
 227                 M_PREPEND(m, NG_ATMLLC_HEADER_LEN + 3, MB_DONTWAIT);
 228                 if (m == NULL) {
 229                         printf("ng_atmllc: M_PREPEND failed\n");
 230                         NG_FREE_ITEM(item);
 231                         return (ENOMEM);
 232                 }
 233                 hdr = mtod(m, struct atmllc *);
 234                 bzero((void *)hdr, sizeof(struct atmllc) + 3);
 235                 bcopy(NG_ATMLLC_HEADER, hdr->llchdr, 6);
 236                 if ((m->m_flags & M_HASFCS) != 0) {
 237                         ATM_LLC_SETTYPE(hdr, NG_ATMLLC_TYPE_FDDI_FCS);
 238                 } else {
 239                         ATM_LLC_SETTYPE(hdr, NG_ATMLLC_TYPE_FDDI_NOFCS);
 240                 }
 241                 outhook = priv->atm;
 242         }
 243
 244         if (outhook == NULL) {
 245                 NG_FREE_ITEM(item);
 246                 return (0);
 247         }
 248
 249         NG_FWD_NEW_DATA(error, item, outhook, m);
 250         return (error);
 251 }
 252
 253 static int
 254 ng_atmllc_disconnect(hook_p hook)
 255 {
 256         node_p  node;
 257         struct  ng_atmllc_priv *priv;
 258
 259         node = NG_HOOK_NODE(hook);
 260         priv = NG_NODE_PRIVATE(node);
 261
 262         if (hook == priv->atm) {
 263                 priv->atm = NULL;
 264         } else if (hook == priv->ether) {
 265                 priv->ether = NULL;
 266         } else if (hook == priv->fddi) {
 267                 priv->fddi = NULL;
 268         }
 269
 270         if (NG_NODE_NUMHOOKS(node) == 0 && NG_NODE_IS_VALID(node)) {
 271                 ng_rmnode_self(node);
 272         }
 273
 274         return (0);
 275 }