sys/netgraph7/ng_eiface.c

   1 /*-
   2  *
   3  * Copyright (c) 1999-2001, Vitaly V Belekhov
   4  * 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  * 1. Redistributions of source code must retain the above copyright
  10  *    notice unmodified, this list of conditions, and the following
  11  *    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  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD: src/sys/netgraph/ng_eiface.c,v 1.39 2007/07/26 10:54:33 glebius Exp $
  29  * $DragonFly: src/sys/netgraph7/ng_eiface.c,v 1.2 2008/06/26 23:05:35 dillon Exp $
  30  */
  31
  32 #include <sys/param.h>
  33 #include <sys/systm.h>
  34 #include <sys/errno.h>
  35 #include <sys/kernel.h>
  36 #include <sys/malloc.h>
  37 #include <sys/mbuf.h>
  38 #include <sys/errno.h>
  39 #include <sys/sockio.h>
  40 #include <sys/socket.h>
  41 #include <sys/syslog.h>
  42
  43 #include <net/if.h>
  44 #include <net/if_types.h>
  45 #include <net/netisr.h>
  46
  47 #include "ng_message.h"
  48 #include "netgraph.h"
  49 #include "ng_parse.h"
  50 #include "ng_eiface.h"
  51
  52 #include <net/bpf.h>
  53 #include <net/ethernet.h>
  54 #include <net/if_arp.h>
  55
  56 static const struct ng_cmdlist ng_eiface_cmdlist[] = {
  57         {
  58           NGM_EIFACE_COOKIE,
  59           NGM_EIFACE_GET_IFNAME,
  60           "getifname",
  61           NULL,
  62           &ng_parse_string_type
  63         },
  64         {
  65           NGM_EIFACE_COOKIE,
  66           NGM_EIFACE_SET,
  67           "set",
  68           &ng_parse_enaddr_type,
  69           NULL
  70         },
  71         { 0 }
  72 };
  73
  74 /* Node private data */
  75 struct ng_eiface_private {
  76         struct ifnet    *ifp;           /* per-interface network data */
  77         int             unit;           /* Interface unit number */
  78         node_p          node;           /* Our netgraph node */
  79         hook_p          ether;          /* Hook for ethernet stream */
  80 };
  81 typedef struct ng_eiface_private *priv_p;
  82
  83 /* Interface methods */
  84 static void     ng_eiface_init(void *xsc);
  85 static void     ng_eiface_start(struct ifnet *ifp);
  86 static int      ng_eiface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
  87 #ifdef DEBUG
  88 static void     ng_eiface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
  89 #endif
  90
  91 /* Netgraph methods */
  92 static int              ng_eiface_mod_event(module_t, int, void *);
  93 static ng_constructor_t ng_eiface_constructor;
  94 static ng_rcvmsg_t      ng_eiface_rcvmsg;
  95 static ng_shutdown_t    ng_eiface_rmnode;
  96 static ng_newhook_t     ng_eiface_newhook;
  97 static ng_rcvdata_t     ng_eiface_rcvdata;
  98 static ng_disconnect_t  ng_eiface_disconnect;
  99
 100 /* Node type descriptor */
 101 static struct ng_type typestruct = {
 102         .version =      NG_ABI_VERSION,
 103         .name =         NG_EIFACE_NODE_TYPE,
 104         .mod_event =    ng_eiface_mod_event,
 105         .constructor =  ng_eiface_constructor,
 106         .rcvmsg =       ng_eiface_rcvmsg,
 107         .shutdown =     ng_eiface_rmnode,
 108         .newhook =      ng_eiface_newhook,
 109         .rcvdata =      ng_eiface_rcvdata,
 110         .disconnect =   ng_eiface_disconnect,
 111         .cmdlist =      ng_eiface_cmdlist
 112 };
 113 NETGRAPH_INIT(eiface, &typestruct);
 114
 115 static struct unrhdr    *ng_eiface_unit;
 116
 117 /************************************************************************
 118                         INTERFACE STUFF
 119  ************************************************************************/
 120
 121 /*
 122  * Process an ioctl for the virtual interface
 123  */
 124 static int
 125 ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
 126 {
 127         struct ifreq *const ifr = (struct ifreq *)data;
 128         int s, error = 0;
 129
 130 #ifdef DEBUG
 131         ng_eiface_print_ioctl(ifp, command, data);
 132 #endif
 133         s = splimp();
 134         switch (command) {
 135
 136         /* These two are mostly handled at a higher layer */
 137         case SIOCSIFADDR:
 138                 error = ether_ioctl(ifp, command, data);
 139                 break;
 140         case SIOCGIFADDR:
 141                 break;
 142
 143         /* Set flags */
 144         case SIOCSIFFLAGS:
 145                 /*
 146                  * If the interface is marked up and stopped, then start it.
 147                  * If it is marked down and running, then stop it.
 148                  */
 149                 if (ifp->if_flags & IFF_UP) {
 150                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 151                                 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
 152                                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
 153                         }
 154                 } else {
 155                         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
 156                                 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
 157                                     IFF_DRV_OACTIVE);
 158                 }
 159                 break;
 160
 161         /* Set the interface MTU */
 162         case SIOCSIFMTU:
 163                 if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX ||
 164                     ifr->ifr_mtu < NG_EIFACE_MTU_MIN)
 165                         error = EINVAL;
 166                 else
 167                         ifp->if_mtu = ifr->ifr_mtu;
 168                 break;
 169
 170         /* Stuff that's not supported */
 171         case SIOCADDMULTI:
 172         case SIOCDELMULTI:
 173                 error = 0;
 174                 break;
 175         case SIOCSIFPHYS:
 176                 error = EOPNOTSUPP;
 177                 break;
 178
 179         default:
 180                 error = EINVAL;
 181                 break;
 182         }
 183         splx(s);
 184         return (error);
 185 }
 186
 187 static void
 188 ng_eiface_init(void *xsc)
 189 {
 190         priv_p sc = xsc;
 191         struct ifnet *ifp = sc->ifp;
 192         int s;
 193
 194         s = splimp();
 195
 196         ifp->if_drv_flags |= IFF_DRV_RUNNING;
 197         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
 198
 199         splx(s);
 200 }
 201
 202 /*
 203  * We simply relay the packet to the "ether" hook, if it is connected.
 204  * We have been through the netgraph locking and are guaranteed to
 205  * be the only code running in this node at this time.
 206  */
 207 static void
 208 ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2)
 209 {
 210         struct ifnet *ifp = arg1;
 211         const priv_p priv = (priv_p)ifp->if_softc;
 212         int error = 0;
 213         struct mbuf *m;
 214
 215         /* Check interface flags */
 216
 217         if (!((ifp->if_flags & IFF_UP) &&
 218             (ifp->if_drv_flags & IFF_DRV_RUNNING)))
 219                 return;
 220
 221         for (;;) {
 222                 /*
 223                  * Grab a packet to transmit.
 224                  */
 225                 IF_DEQUEUE(&ifp->if_snd, m);
 226
 227                 /* If there's nothing to send, break. */
 228                 if (m == NULL)
 229                         break;
 230
 231                 /*
 232                  * Berkeley packet filter.
 233                  * Pass packet to bpf if there is a listener.
 234                  * XXX is this safe? locking?
 235                  */
 236                 BPF_MTAP(ifp, m);
 237
 238                 if (ifp->if_flags & IFF_MONITOR) {
 239                         ifp->if_ipackets++;
 240                         m_freem(m);
 241                         continue;
 242                 }
 243
 244                 /*
 245                  * Send packet; if hook is not connected, mbuf will get
 246                  * freed.
 247                  */
 248                 NG_SEND_DATA_ONLY(error, priv->ether, m);
 249
 250                 /* Update stats */
 251                 if (error == 0)
 252                         ifp->if_opackets++;
 253                 else
 254                         ifp->if_oerrors++;
 255         }
 256
 257         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
 258
 259         return;
 260 }
 261
 262 /*
 263  * This routine is called to deliver a packet out the interface.
 264  * We simply queue the netgraph version to be called when netgraph locking
 265  * allows it to happen.
 266  * Until we know what the rest of the networking code is doing for
 267  * locking, we don't know how we will interact with it.
 268  * Take comfort from the fact that the ifnet struct is part of our
 269  * private info and can't go away while we are queued.
 270  * [Though we don't know it is still there now....]
 271  * it is possible we don't gain anything from this because
 272  * we would like to get the mbuf and queue it as data
 273  * somehow, but we can't and if we did would we solve anything?
 274  */
 275 static void
 276 ng_eiface_start(struct ifnet *ifp)
 277 {
 278
 279         const priv_p priv = (priv_p)ifp->if_softc;
 280
 281         /* Don't do anything if output is active */
 282         if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
 283                 return;
 284
 285         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
 286
 287         if (ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0) != 0)
 288                 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
 289 }
 290
 291 #ifdef DEBUG
 292 /*
 293  * Display an ioctl to the virtual interface
 294  */
 295
 296 static void
 297 ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
 298 {
 299         char *str;
 300
 301         switch (command & IOC_DIRMASK) {
 302         case IOC_VOID:
 303                 str = "IO";
 304                 break;
 305         case IOC_OUT:
 306                 str = "IOR";
 307                 break;
 308         case IOC_IN:
 309                 str = "IOW";
 310                 break;
 311         case IOC_INOUT:
 312                 str = "IORW";
 313                 break;
 314         default:
 315                 str = "IO??";
 316         }
 317         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
 318             ifp->if_xname,
 319             str,
 320             IOCGROUP(command),
 321             command & 0xff,
 322             IOCPARM_LEN(command));
 323 }
 324 #endif /* DEBUG */
 325
 326 /************************************************************************
 327                         NETGRAPH NODE STUFF
 328  ************************************************************************/
 329
 330 /*
 331  * Constructor for a node
 332  */
 333 static int
 334 ng_eiface_constructor(node_p node)
 335 {
 336         struct ifnet *ifp;
 337         priv_p priv;
 338         u_char eaddr[6] = {0,0,0,0,0,0};
 339
 340         /* Allocate node and interface private structures */
 341         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_WAITOK | M_NULLOK | M_ZERO);
 342         if (priv == NULL)
 343                 return (ENOMEM);
 344
 345         ifp = priv->ifp = if_alloc(IFT_ETHER);
 346         if (ifp == NULL) {
 347                 kfree(priv, M_NETGRAPH);
 348                 return (ENOSPC);
 349         }
 350
 351         /* Link them together */
 352         ifp->if_softc = priv;
 353
 354         /* Get an interface unit number */
 355         priv->unit = alloc_unr(ng_eiface_unit);
 356
 357         /* Link together node and private info */
 358         NG_NODE_SET_PRIVATE(node, priv);
 359         priv->node = node;
 360
 361         /* Initialize interface structure */
 362         if_initname(ifp, NG_EIFACE_EIFACE_NAME, priv->unit);
 363         ifp->if_init = ng_eiface_init;
 364         ifp->if_output = ether_output;
 365         ifp->if_start = ng_eiface_start;
 366         ifp->if_ioctl = ng_eiface_ioctl;
 367         ifp->if_watchdog = NULL;
 368         ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
 369         ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
 370
 371 #if 0
 372         /* Give this node name */
 373         bzero(ifname, sizeof(ifname));
 374         sprintf(ifname, "if%s", ifp->if_xname);
 375         (void)ng_name_node(node, ifname);
 376 #endif
 377
 378         /* Attach the interface */
 379         ether_ifattach(ifp, eaddr);
 380
 381         /* Done */
 382         return (0);
 383 }
 384
 385 /*
 386  * Give our ok for a hook to be added
 387  */
 388 static int
 389 ng_eiface_newhook(node_p node, hook_p hook, const char *name)
 390 {
 391         priv_p priv = NG_NODE_PRIVATE(node);
 392         struct ifnet *ifp = priv->ifp;
 393
 394         if (strcmp(name, NG_EIFACE_HOOK_ETHER))
 395                 return (EPFNOSUPPORT);
 396         if (priv->ether != NULL)
 397                 return (EISCONN);
 398         priv->ether = hook;
 399         NG_HOOK_SET_PRIVATE(hook, &priv->ether);
 400
 401         if_link_state_change(ifp, LINK_STATE_UP);
 402
 403         return (0);
 404 }
 405
 406 /*
 407  * Receive a control message
 408  */
 409 static int
 410 ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
 411 {
 412         const priv_p priv = NG_NODE_PRIVATE(node);
 413         struct ifnet *const ifp = priv->ifp;
 414         struct ng_mesg *resp = NULL;
 415         int error = 0;
 416         struct ng_mesg *msg;
 417
 418         NGI_GET_MSG(item, msg);
 419         switch (msg->header.typecookie) {
 420         case NGM_EIFACE_COOKIE:
 421                 switch (msg->header.cmd) {
 422
 423                 case NGM_EIFACE_SET:
 424                     {
 425                         if (msg->header.arglen != ETHER_ADDR_LEN) {
 426                                 error = EINVAL;
 427                                 break;
 428                         }
 429                         error = if_setlladdr(priv->ifp,
 430                             (u_char *)msg->data, ETHER_ADDR_LEN);
 431                         break;
 432                     }
 433
 434                 case NGM_EIFACE_GET_IFNAME:
 435                         NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_WAITOK | M_NULLOK);
 436                         if (resp == NULL) {
 437                                 error = ENOMEM;
 438                                 break;
 439                         }
 440                         strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
 441                         break;
 442
 443                 case NGM_EIFACE_GET_IFADDRS:
 444                     {
 445                         struct ifaddr *ifa;
 446                         caddr_t ptr;
 447                         int buflen;
 448
 449 #define SA_SIZE(s)      ((s)->sa_len<sizeof(*(s))? sizeof(*(s)):(s)->sa_len)
 450
 451                         /* Determine size of response and allocate it */
 452                         buflen = 0;
 453                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
 454                                 buflen += SA_SIZE(ifa->ifa_addr);
 455                         NG_MKRESPONSE(resp, msg, buflen, M_WAITOK | M_NULLOK);
 456                         if (resp == NULL) {
 457                                 error = ENOMEM;
 458                                 break;
 459                         }
 460
 461                         /* Add addresses */
 462                         ptr = resp->data;
 463                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 464                                 const int len = SA_SIZE(ifa->ifa_addr);
 465
 466                                 if (buflen < len) {
 467                                         log(LOG_ERR, "%s: len changed?\n",
 468                                             ifp->if_xname);
 469                                         break;
 470                                 }
 471                                 bcopy(ifa->ifa_addr, ptr, len);
 472                                 ptr += len;
 473                                 buflen -= len;
 474                         }
 475                         break;
 476 #undef SA_SIZE
 477                     }
 478
 479                 default:
 480                         error = EINVAL;
 481                         break;
 482                 } /* end of inner switch() */
 483                 break;
 484         case NGM_FLOW_COOKIE:
 485                 switch (msg->header.cmd) {
 486                 case NGM_LINK_IS_UP:
 487                         if_link_state_change(ifp, LINK_STATE_UP);
 488                         break;
 489                 case NGM_LINK_IS_DOWN:
 490                         if_link_state_change(ifp, LINK_STATE_DOWN);
 491                         break;
 492                 default:
 493                         break;
 494                 }
 495                 break;
 496         default:
 497                 error = EINVAL;
 498                 break;
 499         }
 500         NG_RESPOND_MSG(error, node, item, resp);
 501         NG_FREE_MSG(msg);
 502         return (error);
 503 }
 504
 505 /*
 506  * Receive data from a hook. Pass the packet to the ether_input routine.
 507  */
 508 static int
 509 ng_eiface_rcvdata(hook_p hook, item_p item)
 510 {
 511         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 512         struct ifnet *const ifp = priv->ifp;
 513         struct mbuf *m;
 514
 515         NGI_GET_M(item, m);
 516         NG_FREE_ITEM(item);
 517
 518         if (!((ifp->if_flags & IFF_UP) &&
 519             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
 520                 NG_FREE_M(m);
 521                 return (ENETDOWN);
 522         }
 523
 524         if (m->m_len < ETHER_HDR_LEN) {
 525                 m = m_pullup(m, ETHER_HDR_LEN);
 526                 if (m == NULL)
 527                         return (EINVAL);
 528         }
 529
 530         /* Note receiving interface */
 531         m->m_pkthdr.rcvif = ifp;
 532
 533         /* Update interface stats */
 534         ifp->if_ipackets++;
 535
 536         (*ifp->if_input)(ifp, m);
 537
 538         /* Done */
 539         return (0);
 540 }
 541
 542 /*
 543  * Shutdown processing.
 544  */
 545 static int
 546 ng_eiface_rmnode(node_p node)
 547 {
 548         const priv_p priv = NG_NODE_PRIVATE(node);
 549         struct ifnet *const ifp = priv->ifp;
 550
 551         ether_ifdetach(ifp);
 552         if_free(ifp);
 553         free_unr(ng_eiface_unit, priv->unit);
 554         FREE(priv, M_NETGRAPH);
 555         NG_NODE_SET_PRIVATE(node, NULL);
 556         NG_NODE_UNREF(node);
 557         return (0);
 558 }
 559
 560 /*
 561  * Hook disconnection
 562  */
 563 static int
 564 ng_eiface_disconnect(hook_p hook)
 565 {
 566         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 567
 568         priv->ether = NULL;
 569         return (0);
 570 }
 571
 572 /*
 573  * Handle loading and unloading for this node type.
 574  */
 575 static int
 576 ng_eiface_mod_event(module_t mod, int event, void *data)
 577 {
 578         int error = 0;
 579
 580         switch (event) {
 581         case MOD_LOAD:
 582                 ng_eiface_unit = new_unrhdr(0, 0xffff, NULL);
 583                 break;
 584         case MOD_UNLOAD:
 585                 delete_unrhdr(ng_eiface_unit);
 586                 break;
 587         default:
 588                 error = EOPNOTSUPP;
 589                 break;
 590         }
 591         return (error);
 592 }