if_ef.c

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    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  * $FreeBSD$
   27  */
   28 
   29 #include "opt_inet.h"
   30 #include "opt_ipx.h"
   31 #include "opt_ef.h"
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/sockio.h>
   36 #include <sys/malloc.h>
   37 #include <sys/mbuf.h>
   38 #include <sys/socket.h>
   39 #include <sys/syslog.h>
   40 #include <sys/kernel.h>
   41 #include <sys/module.h>
   42 
   43 #include <net/ethernet.h>
   44 #include <net/if_llc.h>
   45 #include <net/if.h>
   46 #include <net/if_arp.h>
   47 #include <net/if_dl.h>
   48 #include <net/if_types.h>
   49 #include <net/netisr.h>
   50 #include <net/route.h>
   51 #include <net/bpf.h>
   52 
   53 #ifdef INET
   54 #include <netinet/in.h>
   55 #include <netinet/in_var.h>
   56 #include <netinet/if_ether.h>
   57 #endif
   58 
   59 #ifdef IPX
   60 #include <netipx/ipx.h>
   61 #include <netipx/ipx_if.h>
   62 #endif
   63 
   64 /* If none of the supported layers is enabled explicitly enable them all */
   65 #if !defined(ETHER_II) && !defined(ETHER_8023) && !defined(ETHER_8022) && \
   66     !defined(ETHER_SNAP)
   67 #define ETHER_II        1
   68 #define ETHER_8023      1
   69 #define ETHER_8022      1
   70 #define ETHER_SNAP      1
   71 #endif
   72 
   73 /* internal frame types */
   74 #define ETHER_FT_EII            0       /* Ethernet_II - default */
   75 #define ETHER_FT_8023           1       /* 802.3 (Novell) */
   76 #define ETHER_FT_8022           2       /* 802.2 */
   77 #define ETHER_FT_SNAP           3       /* SNAP */
   78 #define EF_NFT                  4       /* total number of frame types */
   79 
   80 #ifdef EF_DEBUG
   81 #define EFDEBUG(format, args...) printf("%s: "format, __func__ ,## args)
   82 #else
   83 #define EFDEBUG(format, args...)
   84 #endif
   85 
   86 #define EFERROR(format, args...) printf("%s: "format, __func__ ,## args)
   87 
   88 struct efnet {
   89         struct arpcom   ef_ac;
   90         struct ifnet *  ef_ifp;
   91         int             ef_frametype;
   92 };
   93 
   94 struct ef_link {
   95         SLIST_ENTRY(ef_link) el_next;
   96         struct ifnet    *el_ifp;                /* raw device for this clones */
   97         struct efnet    *el_units[EF_NFT];      /* our clones */
   98 };
   99 
  100 static SLIST_HEAD(ef_link_head, ef_link) efdev = {NULL};
  101 static int efcount;
  102 
  103 extern int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m);
  104 extern int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp,
  105                 struct sockaddr *dst, short *tp, int *hlen);
  106 
  107 /*
  108 static void ef_reset (struct ifnet *);
  109 */
  110 static int ef_attach(struct efnet *sc);
  111 static int ef_detach(struct efnet *sc);
  112 static void ef_init(void *);
  113 static int ef_ioctl(struct ifnet *, u_long, caddr_t);
  114 static void ef_start(struct ifnet *);
  115 static int ef_input(struct ifnet*, struct ether_header *, struct mbuf *);
  116 static int ef_output(struct ifnet *ifp, struct mbuf **mp,
  117                 struct sockaddr *dst, short *tp, int *hlen);
  118 
  119 static int ef_load(void);
  120 static int ef_unload(void);
  121 
  122 /*
  123  * Install the interface, most of structure initialization done in ef_clone()
  124  */
  125 static int
  126 ef_attach(struct efnet *sc)
  127 {
  128         struct ifnet *ifp = (struct ifnet*)&sc->ef_ac.ac_if;
  129         struct ifaddr *ifa2;
  130         struct sockaddr_dl *sdl2;
  131 
  132         ifp->if_start = ef_start;
  133         ifp->if_watchdog = NULL;
  134         ifp->if_init = ef_init;
  135         ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
  136         ifp->if_flags = (IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST);
  137         /*
  138          * Attach the interface
  139          */
  140         ifa2 = ifaddr_byindex(sc->ef_ifp->if_index);
  141         sdl2 = (struct sockaddr_dl *)ifa2->ifa_addr;
  142         ether_ifattach(ifp, LLADDR(sdl2));
  143 
  144         ifp->if_resolvemulti = 0;
  145         ifp->if_type = IFT_XETHER;
  146         ifp->if_flags |= IFF_RUNNING;
  147 
  148         bcopy(LLADDR(sdl2), sc->ef_ac.ac_enaddr, ETHER_ADDR_LEN);
  149 
  150         EFDEBUG("%s: attached\n", ifp->if_xname);
  151         return 1;
  152 }
  153 
  154 /*
  155  * This is for _testing_only_, just removes interface from interfaces list
  156  */
  157 static int
  158 ef_detach(struct efnet *sc)
  159 {
  160         struct ifnet *ifp = (struct ifnet*)&sc->ef_ac.ac_if;
  161         int s;
  162 
  163         s = splimp();
  164 
  165         if (ifp->if_flags & IFF_UP) {
  166                 if_down(ifp);
  167                 if (ifp->if_flags & IFF_RUNNING) {
  168                     /* find internet addresses and delete routes */
  169                     register struct ifaddr *ifa;
  170                     TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  171                             rtinit(ifa, (int)RTM_DELETE, 0);
  172                     }
  173                 }
  174         }
  175         IFNET_WLOCK();
  176         TAILQ_REMOVE(&ifnet, ifp, if_link);
  177         IFNET_WUNLOCK();
  178         splx(s);
  179         return 0;
  180 }
  181 
  182 static void
  183 ef_init(void *foo) {
  184         return;
  185 }
  186 
  187 static int
  188 ef_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  189 {
  190         struct efnet *sc = ifp->if_softc;
  191         struct ifaddr *ifa = (struct ifaddr*)data;
  192         int s, error;
  193 
  194         EFDEBUG("IOCTL %ld for %s\n", cmd, ifp->if_xname);
  195         error = 0;
  196         s = splimp();
  197         switch (cmd) {
  198             case SIOCSIFFLAGS:
  199                 error = 0;
  200                 break;
  201             case SIOCSIFADDR:
  202                 if (sc->ef_frametype == ETHER_FT_8023 && 
  203                     ifa->ifa_addr->sa_family != AF_IPX) {
  204                         error = EAFNOSUPPORT;
  205                         break;
  206                 }
  207                 ifp->if_flags |= IFF_UP; 
  208                 /* FALL THROUGH */
  209             default:
  210                 error = ether_ioctl(ifp, cmd, data);
  211                 break;
  212         }
  213         splx(s);
  214         return error;
  215 }
  216 
  217 /*
  218  * Currently packet prepared in the ether_output(), but this can be a better
  219  * place.
  220  */
  221 static void
  222 ef_start(struct ifnet *ifp)
  223 {
  224         struct efnet *sc = (struct efnet*)ifp->if_softc;
  225         struct ifnet *p;
  226         struct mbuf *m;
  227         int error;
  228 
  229         ifp->if_flags |= IFF_OACTIVE;
  230         p = sc->ef_ifp;
  231 
  232         EFDEBUG("\n");
  233         for (;;) {
  234                 IF_DEQUEUE(&ifp->if_snd, m);
  235                 if (m == 0)
  236                         break;
  237                 BPF_MTAP(ifp, m);
  238                 IFQ_HANDOFF(p, m, error);
  239                 if (error) {
  240                         ifp->if_oerrors++;
  241                         continue;
  242                 }
  243                 ifp->if_opackets++;
  244         }
  245         ifp->if_flags &= ~IFF_OACTIVE;
  246         return;
  247 }
  248 
  249 /*
  250  * Inline functions do not put additional overhead to procedure call or
  251  * parameter passing but simplify the code
  252  */
  253 static int __inline
  254 ef_inputEII(struct mbuf *m, struct ether_header *eh, u_short ether_type)
  255 {
  256         int isr;
  257 
  258         switch(ether_type) {
  259 #ifdef IPX
  260         case ETHERTYPE_IPX:
  261                 isr = NETISR_IPX;
  262                 break;
  263 #endif
  264 #ifdef INET
  265         case ETHERTYPE_IP:
  266                 if (ip_fastforward(m))
  267                         return (0);
  268                 isr = NETISR_IP;
  269                 break;
  270 
  271         case ETHERTYPE_ARP:
  272                 isr = NETISR_ARP;
  273                 break;
  274 #endif
  275         default:
  276                 return (EPROTONOSUPPORT);
  277         }
  278         netisr_dispatch(isr, m);
  279         return (0);
  280 }
  281 
  282 static int __inline
  283 ef_inputSNAP(struct mbuf *m, struct ether_header *eh, struct llc* l,
  284         u_short ether_type)
  285 {
  286         int isr;
  287 
  288         switch(ether_type) {
  289 #ifdef IPX
  290         case ETHERTYPE_IPX:
  291                 m_adj(m, 8);
  292                 isr = NETISR_IPX;
  293                 break;
  294 #endif
  295         default:
  296                 return (EPROTONOSUPPORT);
  297         }
  298         netisr_dispatch(isr, m);
  299         return (0);
  300 }
  301 
  302 static int __inline
  303 ef_input8022(struct mbuf *m, struct ether_header *eh, struct llc* l,
  304         u_short ether_type)
  305 {
  306         int isr;
  307 
  308         switch(ether_type) {
  309 #ifdef IPX
  310         case 0xe0:
  311                 m_adj(m, 3);
  312                 isr = NETISR_IPX;
  313                 break;
  314 #endif
  315         default:
  316                 return (EPROTONOSUPPORT);
  317         }
  318         netisr_dispatch(isr, m);
  319         return (0);
  320 }
  321 
  322 /*
  323  * Called from ether_input()
  324  */
  325 static int
  326 ef_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m)
  327 {
  328         u_short ether_type;
  329         int ft = -1;
  330         struct efnet *efp;
  331         struct ifnet *eifp;
  332         struct llc *l;
  333         struct ef_link *efl;
  334         int isr;
  335 
  336         ether_type = ntohs(eh->ether_type);
  337         l = NULL;
  338         if (ether_type < ETHERMTU) {
  339                 l = mtod(m, struct llc*);
  340                 if (l->llc_dsap == 0xff && l->llc_ssap == 0xff) {
  341                         /* 
  342                          * Novell's "802.3" frame
  343                          */
  344                         ft = ETHER_FT_8023;
  345                 } else if (l->llc_dsap == 0xaa && l->llc_ssap == 0xaa) {
  346                         /*
  347                          * 802.2/SNAP
  348                          */
  349                         ft = ETHER_FT_SNAP;
  350                         ether_type = ntohs(l->llc_un.type_snap.ether_type);
  351                 } else if (l->llc_dsap == l->llc_ssap) {
  352                         /*
  353                          * 802.3/802.2
  354                          */
  355                         ft = ETHER_FT_8022;
  356                         ether_type = l->llc_ssap;
  357                 }
  358         } else
  359                 ft = ETHER_FT_EII;
  360 
  361         if (ft == -1) {
  362                 EFDEBUG("Unrecognised ether_type %x\n", ether_type);
  363                 return EPROTONOSUPPORT;
  364         }
  365 
  366         /*
  367          * Check if interface configured for the given frame
  368          */
  369         efp = NULL;
  370         SLIST_FOREACH(efl, &efdev, el_next) {
  371                 if (efl->el_ifp == ifp) {
  372                         efp = efl->el_units[ft];
  373                         break;
  374                 }
  375         }
  376         if (efp == NULL) {
  377                 EFDEBUG("Can't find if for %d\n", ft);
  378                 return EPROTONOSUPPORT;
  379         }
  380         eifp = &efp->ef_ac.ac_if;
  381         if ((eifp->if_flags & IFF_UP) == 0)
  382                 return EPROTONOSUPPORT;
  383         eifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh);
  384         m->m_pkthdr.rcvif = eifp;
  385 
  386         BPF_MTAP2(eifp, eh, ETHER_HDR_LEN, m);
  387         /*
  388          * Now we ready to adjust mbufs and pass them to protocol intr's
  389          */
  390         switch(ft) {
  391         case ETHER_FT_EII:
  392                 return (ef_inputEII(m, eh, ether_type));
  393 #ifdef IPX
  394         case ETHER_FT_8023:             /* only IPX can be here */
  395                 isr = NETISR_IPX;
  396                 break;
  397 #endif
  398         case ETHER_FT_SNAP:
  399                 return (ef_inputSNAP(m, eh, l, ether_type));
  400         case ETHER_FT_8022:
  401                 return (ef_input8022(m, eh, l, ether_type));
  402         default:
  403                 EFDEBUG("No support for frame %d and proto %04x\n",
  404                         ft, ether_type);
  405                 return (EPROTONOSUPPORT);
  406         }
  407         netisr_dispatch(isr, m);
  408         return (0);
  409 }
  410 
  411 static int
  412 ef_output(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst, short *tp,
  413         int *hlen)
  414 {
  415         struct efnet *sc = (struct efnet*)ifp->if_softc;
  416         struct mbuf *m = *mp;
  417         u_char *cp;
  418         short type;
  419 
  420         if (ifp->if_type != IFT_XETHER)
  421                 return ENETDOWN;
  422         switch (sc->ef_frametype) {
  423             case ETHER_FT_EII:
  424 #ifdef IPX
  425                 type = htons(ETHERTYPE_IPX);
  426 #else
  427                 return EPFNOSUPPORT;
  428 #endif
  429                 break;
  430             case ETHER_FT_8023:
  431                 type = htons(m->m_pkthdr.len);
  432                 break;
  433             case ETHER_FT_8022:
  434                 M_PREPEND(m, ETHER_HDR_LEN + 3, M_TRYWAIT);
  435                 if (m == NULL) {
  436                         *mp = NULL;
  437                         return ENOBUFS;
  438                 }
  439                 /*
  440                  * Ensure that ethernet header and next three bytes
  441                  * will fit into single mbuf
  442                  */
  443                 m = m_pullup(m, ETHER_HDR_LEN + 3);
  444                 if (m == NULL) {
  445                         *mp = NULL;
  446                         return ENOBUFS;
  447                 }
  448                 m_adj(m, ETHER_HDR_LEN);
  449                 type = htons(m->m_pkthdr.len);
  450                 cp = mtod(m, u_char *);
  451                 *cp++ = 0xE0;
  452                 *cp++ = 0xE0;
  453                 *cp++ = 0x03;
  454                 *hlen += 3;
  455                 break;
  456             case ETHER_FT_SNAP:
  457                 M_PREPEND(m, 8, M_TRYWAIT);
  458                 if (m == NULL) {
  459                         *mp = NULL;
  460                         return ENOBUFS;
  461                 }
  462                 type = htons(m->m_pkthdr.len);
  463                 cp = mtod(m, u_char *);
  464                 bcopy("\xAA\xAA\x03\x00\x00\x00\x81\x37", cp, 8);
  465                 *hlen += 8;
  466                 break;
  467             default:
  468                 return EPFNOSUPPORT;
  469         }
  470         *mp = m;
  471         *tp = type;
  472         return 0;
  473 }
  474 
  475 /*
  476  * Create clone from the given interface
  477  */
  478 static int
  479 ef_clone(struct ef_link *efl, int ft)
  480 {
  481         struct efnet *efp;
  482         struct ifnet *eifp;
  483         struct ifnet *ifp = efl->el_ifp;
  484 
  485         efp = (struct efnet*)malloc(sizeof(struct efnet), M_IFADDR,
  486             M_WAITOK | M_ZERO);
  487         if (efp == NULL)
  488                 return ENOMEM;
  489         efp->ef_ifp = ifp;
  490         efp->ef_frametype = ft;
  491         eifp = &efp->ef_ac.ac_if;
  492         snprintf(eifp->if_xname, IFNAMSIZ,
  493             "%sf%d", ifp->if_xname, efp->ef_frametype);
  494         eifp->if_dname = "ef";
  495         eifp->if_dunit = IF_DUNIT_NONE;
  496         eifp->if_softc = efp;
  497         if (ifp->if_ioctl)
  498                 eifp->if_ioctl = ef_ioctl;
  499         efl->el_units[ft] = efp;
  500         return 0;
  501 }
  502 
  503 static int
  504 ef_load(void)
  505 {
  506         struct ifnet *ifp;
  507         struct efnet *efp;
  508         struct ef_link *efl = NULL;
  509         int error = 0, d;
  510 
  511         IFNET_RLOCK();
  512         TAILQ_FOREACH(ifp, &ifnet, if_link) {
  513                 if (ifp->if_type != IFT_ETHER) continue;
  514                 EFDEBUG("Found interface %s\n", ifp->if_xname);
  515                 efl = (struct ef_link*)malloc(sizeof(struct ef_link), 
  516                     M_IFADDR, M_WAITOK | M_ZERO);
  517                 if (efl == NULL) {
  518                         error = ENOMEM;
  519                         break;
  520                 }
  521 
  522                 efl->el_ifp = ifp;
  523 #ifdef ETHER_II
  524                 error = ef_clone(efl, ETHER_FT_EII);
  525                 if (error) break;
  526 #endif
  527 #ifdef ETHER_8023
  528                 error = ef_clone(efl, ETHER_FT_8023);
  529                 if (error) break;
  530 #endif
  531 #ifdef ETHER_8022
  532                 error = ef_clone(efl, ETHER_FT_8022);
  533                 if (error) break;
  534 #endif
  535 #ifdef ETHER_SNAP
  536                 error = ef_clone(efl, ETHER_FT_SNAP);
  537                 if (error) break;
  538 #endif
  539                 efcount++;
  540                 SLIST_INSERT_HEAD(&efdev, efl, el_next);
  541         }
  542         IFNET_RUNLOCK();
  543         if (error) {
  544                 if (efl)
  545                         SLIST_INSERT_HEAD(&efdev, efl, el_next);
  546                 SLIST_FOREACH(efl, &efdev, el_next) {
  547                         for (d = 0; d < EF_NFT; d++)
  548                                 if (efl->el_units[d])
  549                                         free(efl->el_units[d], M_IFADDR);
  550                         free(efl, M_IFADDR);
  551                 }
  552                 return error;
  553         }
  554         SLIST_FOREACH(efl, &efdev, el_next) {
  555                 for (d = 0; d < EF_NFT; d++) {
  556                         efp = efl->el_units[d];
  557                         if (efp)
  558                                 ef_attach(efp);
  559                 }
  560         }
  561         ef_inputp = ef_input;
  562         ef_outputp = ef_output;
  563         EFDEBUG("Loaded\n");
  564         return 0;
  565 }
  566 
  567 static int
  568 ef_unload(void)
  569 {
  570         struct efnet *efp;
  571         struct ef_link *efl;
  572         int d;
  573 
  574         ef_inputp = NULL;
  575         ef_outputp = NULL;
  576         SLIST_FOREACH(efl, &efdev, el_next) {
  577                 for (d = 0; d < EF_NFT; d++) {
  578                         efp = efl->el_units[d];
  579                         if (efp) {
  580                                 ef_detach(efp);
  581                         }
  582                 }
  583         }
  584         EFDEBUG("Unloaded\n");
  585         return 0;
  586 }
  587 
  588 static int 
  589 if_ef_modevent(module_t mod, int type, void *data)
  590 {
  591         switch ((modeventtype_t)type) {
  592             case MOD_LOAD:
  593                 return ef_load();
  594             case MOD_UNLOAD:
  595                 return ef_unload();
  596             default:
  597                 return EOPNOTSUPP;
  598         }
  599         return 0;
  600 }
  601 
  602 static moduledata_t if_ef_mod = {
  603         "if_ef", if_ef_modevent, NULL
  604 };
  605 
  606 DECLARE_MODULE(if_ef, if_ef_mod, SI_SUB_PSEUDO, SI_ORDER_MIDDLE);
Cache object: 41410ac33dd9882e04e03a91e3b10296
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FreeBSD/Linux Kernel Cross Reference sys/net/if_ef.c

FreeBSD/Linux Kernel Cross Reference
sys/net/if_ef.c
