sys/net/ef/if_ef.c

   1 /*-
   2  * Copyright (c) 1999, 2000 Boris Popov
   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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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/net/if_ef.c,v 1.2.2.4 2001/02/22 09:27:04 bp Exp $
  27  * $DragonFly: src/sys/net/ef/if_ef.c,v 1.27 2008/07/27 10:06:57 sephe Exp $
  28  */
  29
  30 #include "opt_inet.h"
  31 #include "opt_ipx.h"
  32 #include "opt_ef.h"
  33
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/sockio.h>
  37 #include <sys/malloc.h>
  38 #include <sys/mbuf.h>
  39 #include <sys/socket.h>
  40 #include <sys/syslog.h>
  41 #include <sys/kernel.h>
  42 #include <sys/module.h>
  43 #include <sys/thread2.h>
  44
  45 #include <net/ethernet.h>
  46 #include <net/if_llc.h>
  47 #include <net/if.h>
  48 #include <net/if_arp.h>
  49 #include <net/if_dl.h>
  50 #include <net/if_types.h>
  51 #include <net/netisr.h>
  52 #include <net/route.h>
  53 #include <net/bpf.h>
  54
  55 #ifdef INET
  56 #include <netinet/in.h>
  57 #include <netinet/in_var.h>
  58 #include <netinet/if_ether.h>
  59 #endif
  60
  61 #ifdef IPX
  62 #include <netproto/ipx/ipx.h>
  63 #include <netproto/ipx/ipx_if.h>
  64 #endif
  65
  66 /* internal frame types */
  67 #define ETHER_FT_EII            0       /* Ethernet_II - default */
  68 #define ETHER_FT_8023           1       /* 802.3 (Novell) */
  69 #define ETHER_FT_8022           2       /* 802.2 */
  70 #define ETHER_FT_SNAP           3       /* SNAP */
  71 #define EF_NFT                  4       /* total number of frame types */
  72
  73 #ifdef EF_DEBUG
  74 #define EFDEBUG(format, args...) kprintf("%s: "format, __func__ ,## args)
  75 #else
  76 #define EFDEBUG(format, args...)
  77 #endif
  78
  79 #define EFERROR(format, args...) kprintf("%s: "format, __func__ ,## args)
  80
  81 struct efnet {
  82         struct arpcom   ef_ac;
  83         struct ifnet *  ef_ifp;
  84         int             ef_frametype;
  85 };
  86
  87 struct ef_link {
  88         SLIST_ENTRY(ef_link) el_next;
  89         struct ifnet    *el_ifp;                /* raw device for this clones */
  90         struct efnet    *el_units[EF_NFT];      /* our clones */
  91 };
  92
  93 static SLIST_HEAD(ef_link_head, ef_link) efdev = {NULL};
  94 static int efcount;
  95
  96 extern int (*ef_inputp)(struct ifnet*, const struct ether_header *eh,
  97                 struct mbuf *m);
  98 extern int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp,
  99                 struct sockaddr *dst, short *tp, int *hlen);
 100
 101 /*
 102 static void ef_reset (struct ifnet *);
 103 */
 104 static int ef_attach(struct efnet *sc);
 105 static int ef_detach(struct efnet *sc);
 106 static void ef_init(void *);
 107 static int ef_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
 108 static void ef_start(struct ifnet *);
 109 static int ef_input(struct ifnet*, const struct ether_header *, struct mbuf *);
 110 static int ef_output(struct ifnet *ifp, struct mbuf **mp,
 111                 struct sockaddr *dst, short *tp, int *hlen);
 112
 113 static int ef_load(void);
 114 static int ef_unload(void);
 115
 116 /*
 117  * Install the interface, most of structure initialization done in ef_clone()
 118  */
 119 static int
 120 ef_attach(struct efnet *sc)
 121 {
 122         struct ifnet *ifp = (struct ifnet*)&sc->ef_ac.ac_if;
 123
 124         ifp->if_start = ef_start;
 125         ifp->if_watchdog = NULL;
 126         ifp->if_init = ef_init;
 127         ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
 128         ifp->if_flags = (IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST);
 129         /*
 130          * Attach the interface
 131          */
 132         ether_ifattach(ifp, IF_LLADDR(sc->ef_ifp), NULL);
 133
 134         ifp->if_resolvemulti = 0;
 135         ifp->if_type = IFT_XETHER;
 136         ifp->if_flags |= IFF_RUNNING;
 137
 138         EFDEBUG("%s: attached\n", ifp->if_xname);
 139         return 1;
 140 }
 141
 142 /*
 143  * This is for _testing_only_, just removes interface from interfaces list
 144  */
 145 static int
 146 ef_detach(struct efnet *sc)
 147 {
 148         ether_ifdetach(&sc->ef_ac.ac_if);
 149         return 0;
 150 }
 151
 152 static void
 153 ef_init(void *foo __unused)
 154 {
 155 }
 156
 157 static int
 158 ef_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
 159 {
 160         struct efnet *sc = ifp->if_softc;
 161         struct ifaddr *ifa = (struct ifaddr*)data;
 162         int error;
 163
 164         EFDEBUG("IOCTL %ld for %s\n", cmd, ifp->if_xname);
 165         error = 0;
 166         crit_enter();
 167         switch (cmd) {
 168             case SIOCSIFADDR:
 169                 if (sc->ef_frametype == ETHER_FT_8023 &&
 170                     ifa->ifa_addr->sa_family != AF_IPX) {
 171                         error = EAFNOSUPPORT;
 172                         break;
 173                 }
 174                 ifp->if_flags |= IFF_UP;
 175                 /* FALL THROUGH */
 176             case SIOCGIFADDR:
 177             case SIOCSIFMTU:
 178                 error = ether_ioctl(ifp, cmd, data);
 179                 break;
 180             case SIOCSIFFLAGS:
 181                 error = 0;
 182                 break;
 183             default:
 184                 error = EINVAL;
 185         }
 186         crit_exit();
 187         return error;
 188 }
 189
 190 /*
 191  * Currently packet prepared in the ether_output(), but this can be a better
 192  * place.
 193  */
 194 static void
 195 ef_start(struct ifnet *ifp)
 196 {
 197         struct efnet *sc = (struct efnet*)ifp->if_softc;
 198         struct ifnet *p;
 199         struct mbuf *m;
 200
 201         ifp->if_flags |= IFF_OACTIVE;
 202         p = sc->ef_ifp;
 203
 204         EFDEBUG("\n");
 205         for (;;) {
 206                 IF_DEQUEUE(&ifp->if_snd, m);
 207                 if (m == 0)
 208                         break;
 209                 BPF_MTAP(ifp, m);
 210                 if (IF_QFULL(&p->if_snd)) {
 211                         IF_DROP(&p->if_snd);
 212                         ifp->if_oerrors++;
 213                         m_freem(m);
 214                         continue;
 215                 }
 216                 IF_ENQUEUE(&p->if_snd, m);
 217                 if ((p->if_flags & IFF_OACTIVE) == 0) {
 218                         p->if_start(p);
 219                         ifp->if_opackets++;
 220                 }
 221         }
 222         ifp->if_flags &= ~IFF_OACTIVE;
 223         return;
 224 }
 225
 226 /*
 227  * Inline functions do not put additional overhead to procedure call or
 228  * parameter passing but simplify the code
 229  */
 230 static int __inline
 231 ef_inputEII(struct mbuf *m, struct llc* l, u_short ether_type)
 232 {
 233         int isr;
 234
 235         switch(ether_type) {
 236 #ifdef IPX
 237         case ETHERTYPE_IPX:
 238                 isr = NETISR_IPX;
 239                 break;
 240 #endif
 241 #ifdef INET
 242         case ETHERTYPE_IP:
 243 #ifdef notyet
 244                 if (ipflow_fastforward(m))
 245                         return (0);
 246 #endif
 247                 isr = NETISR_IP;
 248                 break;
 249         case ETHERTYPE_ARP:
 250                 isr = NETISR_ARP;
 251                 break;
 252 #endif
 253         default:
 254                 return (EPROTONOSUPPORT);
 255         }
 256         netisr_dispatch(isr, m);
 257         return (0);
 258 }
 259
 260 static int __inline
 261 ef_inputSNAP(struct mbuf *m, struct llc* l, u_short ether_type)
 262 {
 263         int isr;
 264
 265         switch(ether_type) {
 266 #ifdef IPX
 267         case ETHERTYPE_IPX:
 268                 m_adj(m, 8);
 269                 isr = NETISR_IPX;
 270                 break;
 271 #endif
 272         default:
 273                 return (EPROTONOSUPPORT);
 274         }
 275         netisr_dispatch(isr, m);
 276         return (0);
 277 }
 278
 279 static int __inline
 280 ef_input8022(struct mbuf *m, struct llc* l, u_short ether_type)
 281 {
 282         int isr;
 283
 284         switch(ether_type) {
 285 #ifdef IPX
 286         case 0xe0:
 287                 m_adj(m, 3);
 288                 isr = NETISR_IPX;
 289                 break;
 290 #endif
 291         default:
 292                 return (EPROTONOSUPPORT);
 293         }
 294         netisr_dispatch(isr, m);
 295         return (0);
 296 }
 297
 298 /*
 299  * Called from ether_input()
 300  */
 301 static int
 302 ef_input(struct ifnet *ifp, const struct ether_header *eh, struct mbuf *m)
 303 {
 304         u_short ether_type;
 305         int ft = -1;
 306         struct efnet *efp;
 307         struct ifnet *eifp;
 308         struct llc *l;
 309         struct ef_link *efl;
 310         int isr;
 311
 312         ether_type = ntohs(eh->ether_type);
 313         if (ether_type < ETHERMTU) {
 314                 l = mtod(m, struct llc*);
 315                 if (l->llc_dsap == 0xff && l->llc_ssap == 0xff) {
 316                         /*
 317                          * Novell's "802.3" frame
 318                          */
 319                         ft = ETHER_FT_8023;
 320                 } else if (l->llc_dsap == 0xaa && l->llc_ssap == 0xaa) {
 321                         /*
 322                          * 802.2/SNAP
 323                          */
 324                         ft = ETHER_FT_SNAP;
 325                         ether_type = ntohs(l->llc_un.type_snap.ether_type);
 326                 } else if (l->llc_dsap == l->llc_ssap) {
 327                         /*
 328                          * 802.3/802.2
 329                          */
 330                         ft = ETHER_FT_8022;
 331                         ether_type = l->llc_ssap;
 332                 }
 333         } else
 334                 ft = ETHER_FT_EII;
 335
 336         if (ft == -1) {
 337                 EFDEBUG("Unrecognised ether_type %x\n", ether_type);
 338                 return EPROTONOSUPPORT;
 339         }
 340
 341         /*
 342          * Check if interface configured for the given frame
 343          */
 344         efp = NULL;
 345         SLIST_FOREACH(efl, &efdev, el_next) {
 346                 if (efl->el_ifp == ifp) {
 347                         efp = efl->el_units[ft];
 348                         break;
 349                 }
 350         }
 351         if (efp == NULL) {
 352                 EFDEBUG("Can't find if for %d\n", ft);
 353                 return EPROTONOSUPPORT;
 354         }
 355         eifp = &efp->ef_ac.ac_if;
 356         if ((eifp->if_flags & IFF_UP) == 0)
 357                 return EPROTONOSUPPORT;
 358         eifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh);
 359         m->m_pkthdr.rcvif = eifp;
 360
 361         if (eifp->if_bpf)
 362                 bpf_ptap(eifp->if_bpf, m, eh, ETHER_HDR_LEN);
 363
 364         /*
 365          * Now we ready to adjust mbufs and pass them to protocol intr's
 366          */
 367         switch(ft) {
 368         case ETHER_FT_EII:
 369                 return (ef_inputEII(m, l, ether_type));
 370                 break;
 371 #ifdef IPX
 372         case ETHER_FT_8023:             /* only IPX can be here */
 373                 isr = NETISR_IPX;
 374                 break;
 375 #endif
 376         case ETHER_FT_SNAP:
 377                 return (ef_inputSNAP(m, l, ether_type));
 378                 break;
 379         case ETHER_FT_8022:
 380                 return (ef_input8022(m, l, ether_type));
 381                 break;
 382         default:
 383                 EFDEBUG("No support for frame %d and proto %04x\n",
 384                         ft, ether_type);
 385                 return (EPROTONOSUPPORT);
 386         }
 387         netisr_dispatch(isr, m);
 388         return (0);
 389 }
 390
 391 static int
 392 ef_output(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst, short *tp,
 393         int *hlen)
 394 {
 395         struct efnet *sc = (struct efnet*)ifp->if_softc;
 396         struct mbuf *m = *mp;
 397         u_char *cp;
 398         short type;
 399
 400         if (ifp->if_type != IFT_XETHER)
 401                 return ENETDOWN;
 402         switch (sc->ef_frametype) {
 403             case ETHER_FT_EII:
 404 #ifdef IPX
 405                 type = htons(ETHERTYPE_IPX);
 406 #else
 407                 return EPFNOSUPPORT;
 408 #endif
 409                 break;
 410             case ETHER_FT_8023:
 411                 type = htons(m->m_pkthdr.len);
 412                 break;
 413             case ETHER_FT_8022:
 414                 M_PREPEND(m, ETHER_HDR_LEN + 3, MB_WAIT);
 415                 if (m == NULL) {
 416                         *mp = NULL;
 417                         return ENOBUFS;
 418                 }
 419                 /*
 420                  * Ensure that ethernet header and next three bytes
 421                  * will fit into single mbuf
 422                  */
 423                 m = m_pullup(m, ETHER_HDR_LEN + 3);
 424                 if (m == NULL) {
 425                         *mp = NULL;
 426                         return ENOBUFS;
 427                 }
 428                 m_adj(m, ETHER_HDR_LEN);
 429                 type = htons(m->m_pkthdr.len);
 430                 cp = mtod(m, u_char *);
 431                 *cp++ = 0xE0;
 432                 *cp++ = 0xE0;
 433                 *cp++ = 0x03;
 434                 *hlen += 3;
 435                 break;
 436             case ETHER_FT_SNAP:
 437                 M_PREPEND(m, 8, MB_WAIT);
 438                 if (m == NULL) {
 439                         *mp = NULL;
 440                         return ENOBUFS;
 441                 }
 442                 type = htons(m->m_pkthdr.len);
 443                 cp = mtod(m, u_char *);
 444                 bcopy("\xAA\xAA\x03\x00\x00\x00\x81\x37", cp, 8);
 445                 *hlen += 8;
 446                 break;
 447             default:
 448                 return EPFNOSUPPORT;
 449         }
 450         *mp = m;
 451         *tp = type;
 452         return 0;
 453 }
 454
 455 /*
 456  * Create clone from the given interface
 457  */
 458 static int
 459 ef_clone(struct ef_link *efl, int ft)
 460 {
 461         struct efnet *efp;
 462         struct ifnet *eifp;
 463         struct ifnet *ifp = efl->el_ifp;
 464
 465         efp = (struct efnet*)kmalloc(sizeof(struct efnet), M_IFADDR,
 466             M_WAITOK | M_ZERO);
 467         efp->ef_ifp = ifp;
 468         efp->ef_frametype = ft;
 469         eifp = &efp->ef_ac.ac_if;
 470         ksnprintf(eifp->if_xname, IFNAMSIZ,
 471             "%sf%d", ifp->if_xname, efp->ef_frametype);
 472         eifp->if_dname = "ef";
 473         eifp->if_dunit = IF_DUNIT_NONE;
 474         eifp->if_softc = efp;
 475         if (ifp->if_ioctl)
 476                 eifp->if_ioctl = ef_ioctl;
 477         efl->el_units[ft] = efp;
 478         return 0;
 479 }
 480
 481 static int
 482 ef_load(void)
 483 {
 484         struct ifnet *ifp;
 485         struct efnet *efp;
 486         struct ef_link *efl = NULL;
 487         int error = 0, d;
 488
 489         TAILQ_FOREACH(ifp, &ifnet, if_link) {
 490                 if (ifp->if_type != IFT_ETHER) continue;
 491                 EFDEBUG("Found interface %s\n", ifp->if_xname);
 492                 efl = (struct ef_link*)kmalloc(sizeof(struct ef_link),
 493                     M_IFADDR, M_WAITOK | M_ZERO);
 494
 495                 efl->el_ifp = ifp;
 496 #ifdef ETHER_II
 497                 error = ef_clone(efl, ETHER_FT_EII);
 498                 if (error) break;
 499 #endif
 500 #ifdef ETHER_8023
 501                 error = ef_clone(efl, ETHER_FT_8023);
 502                 if (error) break;
 503 #endif
 504 #ifdef ETHER_8022
 505                 error = ef_clone(efl, ETHER_FT_8022);
 506                 if (error) break;
 507 #endif
 508 #ifdef ETHER_SNAP
 509                 error = ef_clone(efl, ETHER_FT_SNAP);
 510                 if (error) break;
 511 #endif
 512                 efcount++;
 513                 SLIST_INSERT_HEAD(&efdev, efl, el_next);
 514         }
 515         if (error) {
 516                 if (efl)
 517                         SLIST_INSERT_HEAD(&efdev, efl, el_next);
 518                 SLIST_FOREACH(efl, &efdev, el_next) {
 519                         for (d = 0; d < EF_NFT; d++)
 520                                 if (efl->el_units[d])
 521                                         kfree(efl->el_units[d], M_IFADDR);
 522                         kfree(efl, M_IFADDR);
 523                 }
 524                 return error;
 525         }
 526         SLIST_FOREACH(efl, &efdev, el_next) {
 527                 for (d = 0; d < EF_NFT; d++) {
 528                         efp = efl->el_units[d];
 529                         if (efp)
 530                                 ef_attach(efp);
 531                 }
 532         }
 533         ef_inputp = ef_input;
 534         ef_outputp = ef_output;
 535         EFDEBUG("Loaded\n");
 536         return 0;
 537 }
 538
 539 static int
 540 ef_unload(void)
 541 {
 542         struct efnet *efp;
 543         struct ef_link *efl;
 544         int d;
 545
 546         ef_inputp = NULL;
 547         ef_outputp = NULL;
 548         SLIST_FOREACH(efl, &efdev, el_next) {
 549                 for (d = 0; d < EF_NFT; d++) {
 550                         efp = efl->el_units[d];
 551                         if (efp) {
 552                                 ef_detach(efp);
 553                         }
 554                 }
 555         }
 556         EFDEBUG("Unloaded\n");
 557         return 0;
 558 }
 559
 560 static int
 561 if_ef_modevent(module_t mod, int type, void *data)
 562 {
 563         switch ((modeventtype_t)type) {
 564             case MOD_LOAD:
 565                 return ef_load();
 566             case MOD_UNLOAD:
 567                 return ef_unload();
 568             default:
 569                 break;
 570         }
 571         return 0;
 572 }
 573
 574 static moduledata_t if_ef_mod = {
 575         "if_ef", if_ef_modevent, NULL
 576 };
 577
 578 DECLARE_MODULE(if_ef, if_ef_mod, SI_SUB_PSEUDO, SI_ORDER_MIDDLE);