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: releng/10.1/sys/net/if_ef.c 249925 2013-04-26 12:50:32Z glebius $
   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/bpf.h>
   51 #include <net/vnet.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                 const 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                 const 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_init = ef_init;
  132         ifp->if_snd.ifq_maxlen = ifqmaxlen;
  133         ifp->if_flags = (IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST);
  134         /*
  135          * Attach the interface
  136          */
  137         ether_ifattach(ifp, IF_LLADDR(sc->ef_pifp));
  138 
  139         ifp->if_resolvemulti = 0;
  140         ifp->if_type = IFT_XETHER;
  141         ifp->if_drv_flags |= IFF_DRV_RUNNING;
  142 
  143         EFDEBUG("%s: attached\n", ifp->if_xname);
  144         return 1;
  145 }
  146 
  147 /*
  148  * This is for _testing_only_, just removes interface from interfaces list
  149  */
  150 static int
  151 ef_detach(struct efnet *sc)
  152 {
  153         struct ifnet *ifp = sc->ef_ifp;
  154 
  155         ether_ifdetach(ifp);
  156         if_free(ifp);
  157 
  158         return 0;
  159 }
  160 
  161 static void
  162 ef_init(void *foo) {
  163         return;
  164 }
  165 
  166 static int
  167 ef_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  168 {
  169         struct efnet *sc = ifp->if_softc;
  170         struct ifaddr *ifa = (struct ifaddr*)data;
  171         int error;
  172 
  173         EFDEBUG("IOCTL %ld for %s\n", cmd, ifp->if_xname);
  174         error = 0;
  175         switch (cmd) {
  176             case SIOCSIFFLAGS:
  177                 error = 0;
  178                 break;
  179             case SIOCSIFADDR:
  180                 if (sc->ef_frametype == ETHER_FT_8023 && 
  181                     ifa->ifa_addr->sa_family != AF_IPX) {
  182                         error = EAFNOSUPPORT;
  183                         break;
  184                 }
  185                 ifp->if_flags |= IFF_UP; 
  186                 /* FALL THROUGH */
  187             default:
  188                 error = ether_ioctl(ifp, cmd, data);
  189                 break;
  190         }
  191         return error;
  192 }
  193 
  194 /*
  195  * Currently packet prepared in the ether_output(), but this can be a better
  196  * place.
  197  */
  198 static void
  199 ef_start(struct ifnet *ifp)
  200 {
  201         struct efnet *sc = (struct efnet*)ifp->if_softc;
  202         struct ifnet *p;
  203         struct mbuf *m;
  204         int error;
  205 
  206         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
  207         p = sc->ef_pifp;
  208 
  209         EFDEBUG("\n");
  210         for (;;) {
  211                 IF_DEQUEUE(&ifp->if_snd, m);
  212                 if (m == 0)
  213                         break;
  214                 BPF_MTAP(ifp, m);
  215                 error = p->if_transmit(p, m);
  216                 if (error) {
  217                         ifp->if_oerrors++;
  218                         continue;
  219                 }
  220                 ifp->if_opackets++;
  221         }
  222         ifp->if_drv_flags &= ~IFF_DRV_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 ether_header *eh, 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                 if ((m = ip_fastforward(m)) == NULL)
  244                         return (0);
  245                 isr = NETISR_IP;
  246                 break;
  247 
  248         case ETHERTYPE_ARP:
  249                 isr = NETISR_ARP;
  250                 break;
  251 #endif
  252         default:
  253                 return (EPROTONOSUPPORT);
  254         }
  255         netisr_dispatch(isr, m);
  256         return (0);
  257 }
  258 
  259 static int __inline
  260 ef_inputSNAP(struct mbuf *m, struct ether_header *eh, struct llc* l,
  261         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 ether_header *eh, struct llc* l,
  281         u_short ether_type)
  282 {
  283         int isr;
  284 
  285         switch(ether_type) {
  286 #ifdef IPX
  287         case 0xe0:
  288                 m_adj(m, 3);
  289                 isr = NETISR_IPX;
  290                 break;
  291 #endif
  292         default:
  293                 return (EPROTONOSUPPORT);
  294         }
  295         netisr_dispatch(isr, m);
  296         return (0);
  297 }
  298 
  299 /*
  300  * Called from ether_input()
  301  */
  302 static int
  303 ef_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m)
  304 {
  305         u_short ether_type;
  306         int ft = -1;
  307         struct efnet *efp;
  308         struct ifnet *eifp;
  309         struct llc *l;
  310         struct ef_link *efl;
  311         int isr;
  312 
  313         ether_type = ntohs(eh->ether_type);
  314         l = NULL;
  315         if (ether_type < ETHERMTU) {
  316                 l = mtod(m, struct llc*);
  317                 if (l->llc_dsap == 0xff && l->llc_ssap == 0xff) {
  318                         /* 
  319                          * Novell's "802.3" frame
  320                          */
  321                         ft = ETHER_FT_8023;
  322                 } else if (l->llc_dsap == 0xaa && l->llc_ssap == 0xaa) {
  323                         /*
  324                          * 802.2/SNAP
  325                          */
  326                         ft = ETHER_FT_SNAP;
  327                         ether_type = ntohs(l->llc_un.type_snap.ether_type);
  328                 } else if (l->llc_dsap == l->llc_ssap) {
  329                         /*
  330                          * 802.3/802.2
  331                          */
  332                         ft = ETHER_FT_8022;
  333                         ether_type = l->llc_ssap;
  334                 }
  335         } else
  336                 ft = ETHER_FT_EII;
  337 
  338         if (ft == -1) {
  339                 EFDEBUG("Unrecognised ether_type %x\n", ether_type);
  340                 return EPROTONOSUPPORT;
  341         }
  342 
  343         /*
  344          * Check if interface configured for the given frame
  345          */
  346         efp = NULL;
  347         SLIST_FOREACH(efl, &efdev, el_next) {
  348                 if (efl->el_ifp == ifp) {
  349                         efp = efl->el_units[ft];
  350                         break;
  351                 }
  352         }
  353         if (efp == NULL) {
  354                 EFDEBUG("Can't find if for %d\n", ft);
  355                 return EPROTONOSUPPORT;
  356         }
  357         eifp = efp->ef_ifp;
  358         if ((eifp->if_flags & IFF_UP) == 0)
  359                 return EPROTONOSUPPORT;
  360         eifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh);
  361         m->m_pkthdr.rcvif = eifp;
  362 
  363         BPF_MTAP2(eifp, eh, ETHER_HDR_LEN, m);
  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, eh, ether_type));
  370 #ifdef IPX
  371         case ETHER_FT_8023:             /* only IPX can be here */
  372                 isr = NETISR_IPX;
  373                 break;
  374 #endif
  375         case ETHER_FT_SNAP:
  376                 return (ef_inputSNAP(m, eh, l, ether_type));
  377         case ETHER_FT_8022:
  378                 return (ef_input8022(m, eh, l, ether_type));
  379         default:
  380                 EFDEBUG("No support for frame %d and proto %04x\n",
  381                         ft, ether_type);
  382                 return (EPROTONOSUPPORT);
  383         }
  384         netisr_dispatch(isr, m);
  385         return (0);
  386 }
  387 
  388 static int
  389 ef_output(struct ifnet *ifp, struct mbuf **mp, const struct sockaddr *dst,
  390         short *tp, int *hlen)
  391 {
  392         struct efnet *sc = (struct efnet*)ifp->if_softc;
  393         struct mbuf *m = *mp;
  394         u_char *cp;
  395         short type;
  396 
  397         if (ifp->if_type != IFT_XETHER)
  398                 return ENETDOWN;
  399         switch (sc->ef_frametype) {
  400             case ETHER_FT_EII:
  401 #ifdef IPX
  402                 type = htons(ETHERTYPE_IPX);
  403 #else
  404                 return EPFNOSUPPORT;
  405 #endif
  406                 break;
  407             case ETHER_FT_8023:
  408                 type = htons(m->m_pkthdr.len);
  409                 break;
  410             case ETHER_FT_8022:
  411                 M_PREPEND(m, ETHER_HDR_LEN + 3, M_WAITOK);
  412                 /*
  413                  * Ensure that ethernet header and next three bytes
  414                  * will fit into single mbuf
  415                  */
  416                 m = m_pullup(m, ETHER_HDR_LEN + 3);
  417                 if (m == NULL) {
  418                         *mp = NULL;
  419                         return ENOBUFS;
  420                 }
  421                 m_adj(m, ETHER_HDR_LEN);
  422                 type = htons(m->m_pkthdr.len);
  423                 cp = mtod(m, u_char *);
  424                 *cp++ = 0xE0;
  425                 *cp++ = 0xE0;
  426                 *cp++ = 0x03;
  427                 *hlen += 3;
  428                 break;
  429             case ETHER_FT_SNAP:
  430                 M_PREPEND(m, 8, M_WAITOK);
  431                 type = htons(m->m_pkthdr.len);
  432                 cp = mtod(m, u_char *);
  433                 bcopy("\xAA\xAA\x03\x00\x00\x00\x81\x37", cp, 8);
  434                 *hlen += 8;
  435                 break;
  436             default:
  437                 return EPFNOSUPPORT;
  438         }
  439         *mp = m;
  440         *tp = type;
  441         return 0;
  442 }
  443 
  444 /*
  445  * Create clone from the given interface
  446  */
  447 static int
  448 ef_clone(struct ef_link *efl, int ft)
  449 {
  450         struct efnet *efp;
  451         struct ifnet *eifp;
  452         struct ifnet *ifp = efl->el_ifp;
  453 
  454         efp = (struct efnet*)malloc(sizeof(struct efnet), M_IFADDR,
  455             M_WAITOK | M_ZERO);
  456         if (efp == NULL)
  457                 return ENOMEM;
  458         efp->ef_pifp = ifp;
  459         efp->ef_frametype = ft;
  460         eifp = efp->ef_ifp = if_alloc(IFT_ETHER);
  461         if (eifp == NULL) {
  462                 free(efp, M_IFADDR);
  463                 return (ENOSPC);
  464         }
  465         snprintf(eifp->if_xname, IFNAMSIZ,
  466             "%sf%d", ifp->if_xname, efp->ef_frametype);
  467         eifp->if_dname = "ef";
  468         eifp->if_dunit = IF_DUNIT_NONE;
  469         eifp->if_softc = efp;
  470         if (ifp->if_ioctl)
  471                 eifp->if_ioctl = ef_ioctl;
  472         efl->el_units[ft] = efp;
  473         return 0;
  474 }
  475 
  476 static int
  477 ef_load(void)
  478 {
  479         VNET_ITERATOR_DECL(vnet_iter);
  480         struct ifnet *ifp;
  481         struct efnet *efp;
  482         struct ef_link *efl = NULL, *efl_temp;
  483         int error = 0, d;
  484 
  485         VNET_LIST_RLOCK();
  486         VNET_FOREACH(vnet_iter) {
  487                 CURVNET_SET(vnet_iter);
  488 
  489                 /*
  490                  * XXXRW: The following loop walks the ifnet list while
  491                  * modifying it, something not well-supported by ifnet
  492                  * locking.  To avoid lock upgrade/recursion issues, manually
  493                  * acquire a write lock of ifnet_sxlock here, rather than a
  494                  * read lock, so that when if_alloc() recurses the lock, we
  495                  * don't panic.  This structure, in which if_ef automatically
  496                  * attaches to all ethernet interfaces, should be replaced
  497                  * with a model like that found in if_vlan, in which
  498                  * interfaces are explicitly configured, which would avoid
  499                  * this (and other) problems.
  500                  */
  501                 sx_xlock(&ifnet_sxlock);
  502                 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
  503                         if (ifp->if_type != IFT_ETHER) continue;
  504                         EFDEBUG("Found interface %s\n", ifp->if_xname);
  505                         efl = (struct ef_link*)malloc(sizeof(struct ef_link), 
  506                             M_IFADDR, M_WAITOK | M_ZERO);
  507                         if (efl == NULL) {
  508                                 error = ENOMEM;
  509                                 break;
  510                         }
  511 
  512                         efl->el_ifp = ifp;
  513 #ifdef ETHER_II
  514                         error = ef_clone(efl, ETHER_FT_EII);
  515                         if (error) break;
  516 #endif
  517 #ifdef ETHER_8023
  518                         error = ef_clone(efl, ETHER_FT_8023);
  519                         if (error) break;
  520 #endif
  521 #ifdef ETHER_8022
  522                         error = ef_clone(efl, ETHER_FT_8022);
  523                         if (error) break;
  524 #endif
  525 #ifdef ETHER_SNAP
  526                         error = ef_clone(efl, ETHER_FT_SNAP);
  527                         if (error) break;
  528 #endif
  529                         efcount++;
  530                         SLIST_INSERT_HEAD(&efdev, efl, el_next);
  531                 }
  532                 sx_xunlock(&ifnet_sxlock);
  533                 CURVNET_RESTORE();
  534         }
  535         VNET_LIST_RUNLOCK();
  536         if (error) {
  537                 if (efl)
  538                         SLIST_INSERT_HEAD(&efdev, efl, el_next);
  539                 SLIST_FOREACH_SAFE(efl, &efdev, el_next, efl_temp) {
  540                         for (d = 0; d < EF_NFT; d++)
  541                                 if (efl->el_units[d]) {
  542                                         if (efl->el_units[d]->ef_pifp != NULL)
  543                                                 if_free(efl->el_units[d]->ef_pifp);
  544                                         free(efl->el_units[d], M_IFADDR);
  545                                 }
  546                         free(efl, M_IFADDR);
  547                 }
  548                 return error;
  549         }
  550         SLIST_FOREACH(efl, &efdev, el_next) {
  551                 for (d = 0; d < EF_NFT; d++) {
  552                         efp = efl->el_units[d];
  553                         if (efp)
  554                                 ef_attach(efp);
  555                 }
  556         }
  557         ef_inputp = ef_input;
  558         ef_outputp = ef_output;
  559         EFDEBUG("Loaded\n");
  560         return 0;
  561 }
  562 
  563 static int
  564 ef_unload(void)
  565 {
  566         struct efnet *efp;
  567         struct ef_link *efl;
  568         int d;
  569 
  570         ef_inputp = NULL;
  571         ef_outputp = NULL;
  572         SLIST_FOREACH(efl, &efdev, el_next) {
  573                 for (d = 0; d < EF_NFT; d++) {
  574                         efp = efl->el_units[d];
  575                         if (efp) {
  576                                 ef_detach(efp);
  577                         }
  578                 }
  579         }
  580         EFDEBUG("Unloaded\n");
  581         return 0;
  582 }
  583 
  584 static int 
  585 if_ef_modevent(module_t mod, int type, void *data)
  586 {
  587         switch ((modeventtype_t)type) {
  588             case MOD_LOAD:
  589                 return ef_load();
  590             case MOD_UNLOAD:
  591                 return ef_unload();
  592             default:
  593                 return EOPNOTSUPP;
  594         }
  595         return 0;
  596 }
  597 
  598 static moduledata_t if_ef_mod = {
  599         "if_ef", if_ef_modevent, NULL
  600 };
  601 
  602 DECLARE_MODULE(if_ef, if_ef_mod, SI_SUB_PSEUDO, SI_ORDER_MIDDLE);

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