The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net/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 ifnet    *ef_ifp;
   90         struct ifnet    *ef_pifp;
   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 = sc->ef_ifp;
  129 
  130         ifp->if_start = ef_start;
  131         ifp->if_watchdog = NULL;
  132         ifp->if_init = ef_init;
  133         ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
  134         ifp->if_flags = (IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST);
  135         /*
  136          * Attach the interface
  137          */
  138         ether_ifattach(ifp, IF_LLADDR(sc->ef_pifp));
  139 
  140         ifp->if_resolvemulti = 0;
  141         ifp->if_type = IFT_XETHER;
  142         ifp->if_drv_flags |= IFF_DRV_RUNNING;
  143 
  144         EFDEBUG("%s: attached\n", ifp->if_xname);
  145         return 1;
  146 }
  147 
  148 /*
  149  * This is for _testing_only_, just removes interface from interfaces list
  150  */
  151 static int
  152 ef_detach(struct efnet *sc)
  153 {
  154         struct ifnet *ifp = sc->ef_ifp;
  155         int s;
  156 
  157         s = splimp();
  158 
  159         ether_ifdetach(ifp);
  160         if_free(ifp);
  161 
  162         splx(s);
  163         return 0;
  164 }
  165 
  166 static void
  167 ef_init(void *foo) {
  168         return;
  169 }
  170 
  171 static int
  172 ef_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  173 {
  174         struct efnet *sc = ifp->if_softc;
  175         struct ifaddr *ifa = (struct ifaddr*)data;
  176         int s, error;
  177 
  178         EFDEBUG("IOCTL %ld for %s\n", cmd, ifp->if_xname);
  179         error = 0;
  180         s = splimp();
  181         switch (cmd) {
  182             case SIOCSIFFLAGS:
  183                 error = 0;
  184                 break;
  185             case SIOCSIFADDR:
  186                 if (sc->ef_frametype == ETHER_FT_8023 && 
  187                     ifa->ifa_addr->sa_family != AF_IPX) {
  188                         error = EAFNOSUPPORT;
  189                         break;
  190                 }
  191                 ifp->if_flags |= IFF_UP; 
  192                 /* FALL THROUGH */
  193             default:
  194                 error = ether_ioctl(ifp, cmd, data);
  195                 break;
  196         }
  197         splx(s);
  198         return error;
  199 }
  200 
  201 /*
  202  * Currently packet prepared in the ether_output(), but this can be a better
  203  * place.
  204  */
  205 static void
  206 ef_start(struct ifnet *ifp)
  207 {
  208         struct efnet *sc = (struct efnet*)ifp->if_softc;
  209         struct ifnet *p;
  210         struct mbuf *m;
  211         int error;
  212 
  213         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
  214         p = sc->ef_pifp;
  215 
  216         EFDEBUG("\n");
  217         for (;;) {
  218                 IF_DEQUEUE(&ifp->if_snd, m);
  219                 if (m == 0)
  220                         break;
  221                 BPF_MTAP(ifp, m);
  222                 IFQ_HANDOFF(p, m, error);
  223                 if (error) {
  224                         ifp->if_oerrors++;
  225                         continue;
  226                 }
  227                 ifp->if_opackets++;
  228         }
  229         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  230         return;
  231 }
  232 
  233 /*
  234  * Inline functions do not put additional overhead to procedure call or
  235  * parameter passing but simplify the code
  236  */
  237 static int __inline
  238 ef_inputEII(struct mbuf *m, struct ether_header *eh, u_short ether_type)
  239 {
  240         int isr;
  241 
  242         switch(ether_type) {
  243 #ifdef IPX
  244         case ETHERTYPE_IPX:
  245                 isr = NETISR_IPX;
  246                 break;
  247 #endif
  248 #ifdef INET
  249         case ETHERTYPE_IP:
  250                 if ((m = ip_fastforward(m)) == NULL)
  251                         return (0);
  252                 isr = NETISR_IP;
  253                 break;
  254 
  255         case ETHERTYPE_ARP:
  256                 isr = NETISR_ARP;
  257                 break;
  258 #endif
  259         default:
  260                 return (EPROTONOSUPPORT);
  261         }
  262         netisr_dispatch(isr, m);
  263         return (0);
  264 }
  265 
  266 static int __inline
  267 ef_inputSNAP(struct mbuf *m, struct ether_header *eh, struct llc* l,
  268         u_short ether_type)
  269 {
  270         int isr;
  271 
  272         switch(ether_type) {
  273 #ifdef IPX
  274         case ETHERTYPE_IPX:
  275                 m_adj(m, 8);
  276                 isr = NETISR_IPX;
  277                 break;
  278 #endif
  279         default:
  280                 return (EPROTONOSUPPORT);
  281         }
  282         netisr_dispatch(isr, m);
  283         return (0);
  284 }
  285 
  286 static int __inline
  287 ef_input8022(struct mbuf *m, struct ether_header *eh, struct llc* l,
  288         u_short ether_type)
  289 {
  290         int isr;
  291 
  292         switch(ether_type) {
  293 #ifdef IPX
  294         case 0xe0:
  295                 m_adj(m, 3);
  296                 isr = NETISR_IPX;
  297                 break;
  298 #endif
  299         default:
  300                 return (EPROTONOSUPPORT);
  301         }
  302         netisr_dispatch(isr, m);
  303         return (0);
  304 }
  305 
  306 /*
  307  * Called from ether_input()
  308  */
  309 static int
  310 ef_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m)
  311 {
  312         u_short ether_type;
  313         int ft = -1;
  314         struct efnet *efp;
  315         struct ifnet *eifp;
  316         struct llc *l;
  317         struct ef_link *efl;
  318         int isr;
  319 
  320         ether_type = ntohs(eh->ether_type);
  321         l = NULL;
  322         if (ether_type < ETHERMTU) {
  323                 l = mtod(m, struct llc*);
  324                 if (l->llc_dsap == 0xff && l->llc_ssap == 0xff) {
  325                         /* 
  326                          * Novell's "802.3" frame
  327                          */
  328                         ft = ETHER_FT_8023;
  329                 } else if (l->llc_dsap == 0xaa && l->llc_ssap == 0xaa) {
  330                         /*
  331                          * 802.2/SNAP
  332                          */
  333                         ft = ETHER_FT_SNAP;
  334                         ether_type = ntohs(l->llc_un.type_snap.ether_type);
  335                 } else if (l->llc_dsap == l->llc_ssap) {
  336                         /*
  337                          * 802.3/802.2
  338                          */
  339                         ft = ETHER_FT_8022;
  340                         ether_type = l->llc_ssap;
  341                 }
  342         } else
  343                 ft = ETHER_FT_EII;
  344 
  345         if (ft == -1) {
  346                 EFDEBUG("Unrecognised ether_type %x\n", ether_type);
  347                 return EPROTONOSUPPORT;
  348         }
  349 
  350         /*
  351          * Check if interface configured for the given frame
  352          */
  353         efp = NULL;
  354         SLIST_FOREACH(efl, &efdev, el_next) {
  355                 if (efl->el_ifp == ifp) {
  356                         efp = efl->el_units[ft];
  357                         break;
  358                 }
  359         }
  360         if (efp == NULL) {
  361                 EFDEBUG("Can't find if for %d\n", ft);
  362                 return EPROTONOSUPPORT;
  363         }
  364         eifp = efp->ef_ifp;
  365         if ((eifp->if_flags & IFF_UP) == 0)
  366                 return EPROTONOSUPPORT;
  367         eifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh);
  368         m->m_pkthdr.rcvif = eifp;
  369 
  370         BPF_MTAP2(eifp, eh, ETHER_HDR_LEN, m);
  371         /*
  372          * Now we ready to adjust mbufs and pass them to protocol intr's
  373          */
  374         switch(ft) {
  375         case ETHER_FT_EII:
  376                 return (ef_inputEII(m, eh, ether_type));
  377 #ifdef IPX
  378         case ETHER_FT_8023:             /* only IPX can be here */
  379                 isr = NETISR_IPX;
  380                 break;
  381 #endif
  382         case ETHER_FT_SNAP:
  383                 return (ef_inputSNAP(m, eh, l, ether_type));
  384         case ETHER_FT_8022:
  385                 return (ef_input8022(m, eh, l, ether_type));
  386         default:
  387                 EFDEBUG("No support for frame %d and proto %04x\n",
  388                         ft, ether_type);
  389                 return (EPROTONOSUPPORT);
  390         }
  391         netisr_dispatch(isr, m);
  392         return (0);
  393 }
  394 
  395 static int
  396 ef_output(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst, short *tp,
  397         int *hlen)
  398 {
  399         struct efnet *sc = (struct efnet*)ifp->if_softc;
  400         struct mbuf *m = *mp;
  401         u_char *cp;
  402         short type;
  403 
  404         if (ifp->if_type != IFT_XETHER)
  405                 return ENETDOWN;
  406         switch (sc->ef_frametype) {
  407             case ETHER_FT_EII:
  408 #ifdef IPX
  409                 type = htons(ETHERTYPE_IPX);
  410 #else
  411                 return EPFNOSUPPORT;
  412 #endif
  413                 break;
  414             case ETHER_FT_8023:
  415                 type = htons(m->m_pkthdr.len);
  416                 break;
  417             case ETHER_FT_8022:
  418                 M_PREPEND(m, ETHER_HDR_LEN + 3, M_TRYWAIT);
  419                 if (m == NULL) {
  420                         *mp = NULL;
  421                         return ENOBUFS;
  422                 }
  423                 /*
  424                  * Ensure that ethernet header and next three bytes
  425                  * will fit into single mbuf
  426                  */
  427                 m = m_pullup(m, ETHER_HDR_LEN + 3);
  428                 if (m == NULL) {
  429                         *mp = NULL;
  430                         return ENOBUFS;
  431                 }
  432                 m_adj(m, ETHER_HDR_LEN);
  433                 type = htons(m->m_pkthdr.len);
  434                 cp = mtod(m, u_char *);
  435                 *cp++ = 0xE0;
  436                 *cp++ = 0xE0;
  437                 *cp++ = 0x03;
  438                 *hlen += 3;
  439                 break;
  440             case ETHER_FT_SNAP:
  441                 M_PREPEND(m, 8, M_TRYWAIT);
  442                 if (m == NULL) {
  443                         *mp = NULL;
  444                         return ENOBUFS;
  445                 }
  446                 type = htons(m->m_pkthdr.len);
  447                 cp = mtod(m, u_char *);
  448                 bcopy("\xAA\xAA\x03\x00\x00\x00\x81\x37", cp, 8);
  449                 *hlen += 8;
  450                 break;
  451             default:
  452                 return EPFNOSUPPORT;
  453         }
  454         *mp = m;
  455         *tp = type;
  456         return 0;
  457 }
  458 
  459 /*
  460  * Create clone from the given interface
  461  */
  462 static int
  463 ef_clone(struct ef_link *efl, int ft)
  464 {
  465         struct efnet *efp;
  466         struct ifnet *eifp;
  467         struct ifnet *ifp = efl->el_ifp;
  468 
  469         efp = (struct efnet*)malloc(sizeof(struct efnet), M_IFADDR,
  470             M_WAITOK | M_ZERO);
  471         if (efp == NULL)
  472                 return ENOMEM;
  473         efp->ef_pifp = ifp;
  474         efp->ef_frametype = ft;
  475         eifp = efp->ef_ifp = if_alloc(IFT_ETHER);
  476         if (eifp == NULL) {
  477                 free(efp, M_IFADDR);
  478                 return (ENOSPC);
  479         }
  480         snprintf(eifp->if_xname, IFNAMSIZ,
  481             "%sf%d", ifp->if_xname, efp->ef_frametype);
  482         eifp->if_dname = "ef";
  483         eifp->if_dunit = IF_DUNIT_NONE;
  484         eifp->if_softc = efp;
  485         if (ifp->if_ioctl)
  486                 eifp->if_ioctl = ef_ioctl;
  487         efl->el_units[ft] = efp;
  488         return 0;
  489 }
  490 
  491 static int
  492 ef_load(void)
  493 {
  494         struct ifnet *ifp;
  495         struct efnet *efp;
  496         struct ef_link *efl = NULL, *efl_temp;
  497         int error = 0, d;
  498 
  499         IFNET_RLOCK();
  500         TAILQ_FOREACH(ifp, &ifnet, if_link) {
  501                 if (ifp->if_type != IFT_ETHER) continue;
  502                 EFDEBUG("Found interface %s\n", ifp->if_xname);
  503                 efl = (struct ef_link*)malloc(sizeof(struct ef_link), 
  504                     M_IFADDR, M_WAITOK | M_ZERO);
  505                 if (efl == NULL) {
  506                         error = ENOMEM;
  507                         break;
  508                 }
  509 
  510                 efl->el_ifp = ifp;
  511 #ifdef ETHER_II
  512                 error = ef_clone(efl, ETHER_FT_EII);
  513                 if (error) break;
  514 #endif
  515 #ifdef ETHER_8023
  516                 error = ef_clone(efl, ETHER_FT_8023);
  517                 if (error) break;
  518 #endif
  519 #ifdef ETHER_8022
  520                 error = ef_clone(efl, ETHER_FT_8022);
  521                 if (error) break;
  522 #endif
  523 #ifdef ETHER_SNAP
  524                 error = ef_clone(efl, ETHER_FT_SNAP);
  525                 if (error) break;
  526 #endif
  527                 efcount++;
  528                 SLIST_INSERT_HEAD(&efdev, efl, el_next);
  529         }
  530         IFNET_RUNLOCK();
  531         if (error) {
  532                 if (efl)
  533                         SLIST_INSERT_HEAD(&efdev, efl, el_next);
  534                 SLIST_FOREACH_SAFE(efl, &efdev, el_next, efl_temp) {
  535                         for (d = 0; d < EF_NFT; d++)
  536                                 if (efl->el_units[d]) {
  537                                         if (efl->el_units[d]->ef_pifp != NULL)
  538                                                 if_free(efl->el_units[d]->ef_pifp);
  539                                         free(efl->el_units[d], M_IFADDR);
  540                                 }
  541                         free(efl, M_IFADDR);
  542                 }
  543                 return error;
  544         }
  545         SLIST_FOREACH(efl, &efdev, el_next) {
  546                 for (d = 0; d < EF_NFT; d++) {
  547                         efp = efl->el_units[d];
  548                         if (efp)
  549                                 ef_attach(efp);
  550                 }
  551         }
  552         ef_inputp = ef_input;
  553         ef_outputp = ef_output;
  554         EFDEBUG("Loaded\n");
  555         return 0;
  556 }
  557 
  558 static int
  559 ef_unload(void)
  560 {
  561         struct efnet *efp;
  562         struct ef_link *efl;
  563         int d;
  564 
  565         ef_inputp = NULL;
  566         ef_outputp = NULL;
  567         SLIST_FOREACH(efl, &efdev, el_next) {
  568                 for (d = 0; d < EF_NFT; d++) {
  569                         efp = efl->el_units[d];
  570                         if (efp) {
  571                                 ef_detach(efp);
  572                         }
  573                 }
  574         }
  575         EFDEBUG("Unloaded\n");
  576         return 0;
  577 }
  578 
  579 static int 
  580 if_ef_modevent(module_t mod, int type, void *data)
  581 {
  582         switch ((modeventtype_t)type) {
  583             case MOD_LOAD:
  584                 return ef_load();
  585             case MOD_UNLOAD:
  586                 return ef_unload();
  587             default:
  588                 return EOPNOTSUPP;
  589         }
  590         return 0;
  591 }
  592 
  593 static moduledata_t if_ef_mod = {
  594         "if_ef", if_ef_modevent, NULL
  595 };
  596 
  597 DECLARE_MODULE(if_ef, if_ef_mod, SI_SUB_PSEUDO, SI_ORDER_MIDDLE);

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