The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/netgraph/ng_fec.c

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    1 /*
    2  * ng_fec.c
    3  *
    4  * Copyright (c) 2001 Berkeley Software Design, Inc.
    5  * Copyright (c) 2000, 2001
    6  *      Bill Paul <wpaul@osd.bsdi.com>.  All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by Bill Paul.
   19  * 4. Neither the name of the author nor the names of any co-contributors
   20  *    may be used to endorse or promote products derived from this software
   21  *    without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
   27  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   30  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   31  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   32  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   33  * THE POSSIBILITY OF SUCH DAMAGE.
   34  *
   35  * $FreeBSD: releng/5.1/sys/netgraph/ng_fec.c 113781 2003-04-21 03:17:27Z rwatson $
   36  */
   37 /*
   38  * Copyright (c) 1996-1999 Whistle Communications, Inc.
   39  * All rights reserved.
   40  * 
   41  * Subject to the following obligations and disclaimer of warranty, use and
   42  * redistribution of this software, in source or object code forms, with or
   43  * without modifications are expressly permitted by Whistle Communications;
   44  * provided, however, that:
   45  * 1. Any and all reproductions of the source or object code must include the
   46  *    copyright notice above and the following disclaimer of warranties; and
   47  * 2. No rights are granted, in any manner or form, to use Whistle
   48  *    Communications, Inc. trademarks, including the mark "WHISTLE
   49  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   50  *    such appears in the above copyright notice or in the software.
   51  * 
   52  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   53  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   54  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   55  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   56  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   57  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   58  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   59  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   60  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   61  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   62  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   63  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   64  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   65  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   66  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   67  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   68  * OF SUCH DAMAGE.
   69  *
   70  * Author: Archie Cobbs <archie@freebsd.org>
   71  *
   72  * $Whistle: ng_fec.c,v 1.33 1999/11/01 09:24:51 julian Exp $
   73  */
   74 
   75 /*
   76  * This module implements ethernet channel bonding using the Cisco
   77  * Fast EtherChannel mechanism. Two or four ports may be combined
   78  * into a single aggregate interface.
   79  *
   80  * Interfaces are named fec0, fec1, etc.  New nodes take the
   81  * first available interface name.
   82  *
   83  * This node also includes Berkeley packet filter support.
   84  *
   85  * Note that this node doesn't need to connect to any other
   86  * netgraph nodes in order to do its work.
   87  */
   88 
   89 #include <sys/param.h>
   90 #include <sys/systm.h>
   91 #include <sys/errno.h>
   92 #include <sys/kernel.h>
   93 #include <sys/malloc.h>
   94 #include <sys/mbuf.h>
   95 #include <sys/errno.h>
   96 #include <sys/sockio.h>
   97 #include <sys/socket.h>
   98 #include <sys/syslog.h>
   99 #include <sys/libkern.h>
  100 #include <sys/queue.h>
  101 
  102 #include <net/if.h>
  103 #include <net/if_types.h>
  104 #include <net/if_arp.h>
  105 #include <net/if_dl.h>
  106 #include <net/if_media.h>
  107 #include <net/bpf.h>
  108 #include <net/ethernet.h>
  109 
  110 #include "opt_inet.h"
  111 #include "opt_inet6.h"
  112 
  113 #include <netinet/in.h>
  114 #ifdef INET
  115 #include <netinet/in_systm.h>
  116 #include <netinet/ip.h>
  117 #endif
  118 
  119 #ifdef INET6
  120 #include <netinet/ip6.h>
  121 #endif
  122 
  123 #include <netgraph/ng_message.h>
  124 #include <netgraph/netgraph.h>
  125 #include <netgraph/ng_parse.h>
  126 #include <netgraph/ng_fec.h>
  127 
  128 #define IFP2NG(ifp)  ((struct ng_node *)((struct arpcom *)(ifp))->ac_netgraph)
  129 #define FEC_INC(x, y)   (x) = (x + 1) % y
  130 
  131 /*
  132  * Current fast etherchannel implementations use either 2 or 4
  133  * ports, so for now we limit the maximum bundle size to 4 interfaces.
  134  */
  135 #define FEC_BUNDLESIZ   4
  136 
  137 struct ng_fec_portlist {
  138         struct ifnet            *fec_if;
  139         void                    (*fec_if_input) (struct ifnet *, struct mbuf *);
  140         int                     fec_idx;
  141         int                     fec_ifstat;
  142         struct ether_addr       fec_mac;
  143         TAILQ_ENTRY(ng_fec_portlist) fec_list;
  144 };
  145 
  146 struct ng_fec_bundle {
  147         TAILQ_HEAD(,ng_fec_portlist) ng_fec_ports;
  148         int                     fec_ifcnt;
  149         int                     fec_btype;
  150 };
  151 
  152 #define FEC_BTYPE_MAC           0x01
  153 #define FEC_BTYPE_INET          0x02
  154 #define FEC_BTYPE_INET6         0x03
  155 
  156 /* Node private data */
  157 struct ng_fec_private {
  158         struct arpcom arpcom;
  159         struct ifmedia ifmedia;
  160         int     if_flags;
  161         int     if_error;               /* XXX */
  162         int     unit;                   /* Interface unit number */
  163         node_p  node;                   /* Our netgraph node */
  164         struct ng_fec_bundle fec_bundle;/* Aggregate bundle */
  165         struct callout_handle fec_ch;   /* callout handle for ticker */
  166 };
  167 typedef struct ng_fec_private *priv_p;
  168 
  169 /* Interface methods */
  170 static void     ng_fec_input(struct ifnet *, struct mbuf *);
  171 static void     ng_fec_start(struct ifnet *ifp);
  172 static int      ng_fec_choose_port(struct ng_fec_bundle *b,
  173                         struct mbuf *m, struct ifnet **ifp);
  174 static int      ng_fec_setport(struct ifnet *ifp, u_long cmd, caddr_t data);
  175 static void     ng_fec_init(void *arg);
  176 static void     ng_fec_stop(struct ifnet *ifp);
  177 static int      ng_fec_ifmedia_upd(struct ifnet *ifp);
  178 static void     ng_fec_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr);
  179 static int      ng_fec_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
  180 static int      ng_fec_output(struct ifnet *ifp, struct mbuf *m0,
  181                         struct sockaddr *dst, struct rtentry *rt0);
  182 static void     ng_fec_tick(void *arg);
  183 static int      ng_fec_addport(struct ng_fec_private *priv, char *iface);
  184 static int      ng_fec_delport(struct ng_fec_private *priv, char *iface);
  185 
  186 #ifdef DEBUG
  187 static void     ng_fec_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
  188 #endif
  189 
  190 /* Netgraph methods */
  191 static ng_constructor_t ng_fec_constructor;
  192 static ng_rcvmsg_t      ng_fec_rcvmsg;
  193 static ng_shutdown_t    ng_fec_shutdown;
  194 
  195 /* List of commands and how to convert arguments to/from ASCII */
  196 static const struct ng_cmdlist ng_fec_cmds[] = {
  197         {
  198           NGM_FEC_COOKIE,
  199           NGM_FEC_ADD_IFACE,
  200           "add_iface",
  201           &ng_parse_string_type,
  202           NULL,
  203         },
  204         {
  205           NGM_FEC_COOKIE,
  206           NGM_FEC_DEL_IFACE,
  207           "del_iface",
  208           &ng_parse_string_type,
  209           NULL,
  210         },
  211         {
  212           NGM_FEC_COOKIE,
  213           NGM_FEC_SET_MODE_MAC,
  214           "set_mode_mac",
  215           NULL,
  216           NULL,
  217         },
  218         {
  219           NGM_FEC_COOKIE,
  220           NGM_FEC_SET_MODE_INET,
  221           "set_mode_inet",
  222           NULL,
  223           NULL,
  224         },
  225         { 0 }
  226 };
  227 
  228 /* Node type descriptor */
  229 static struct ng_type typestruct = {
  230         NG_ABI_VERSION,
  231         NG_FEC_NODE_TYPE,
  232         NULL,
  233         ng_fec_constructor,
  234         ng_fec_rcvmsg,
  235         ng_fec_shutdown,
  236         NULL,
  237         NULL,
  238         NULL,
  239         NULL,
  240         NULL,
  241         ng_fec_cmds
  242 };
  243 NETGRAPH_INIT(fec, &typestruct);
  244 
  245 /* We keep a bitmap indicating which unit numbers are free.
  246    One means the unit number is free, zero means it's taken. */
  247 static int      *ng_fec_units = NULL;
  248 static int      ng_fec_units_len = 0;
  249 static int      ng_units_in_use = 0;
  250 
  251 #define UNITS_BITSPERWORD       (sizeof(*ng_fec_units) * NBBY)
  252 
  253 /*
  254  * Find the first free unit number for a new interface.
  255  * Increase the size of the unit bitmap as necessary.
  256  */
  257 static __inline__ int
  258 ng_fec_get_unit(int *unit)
  259 {
  260         int index, bit;
  261 
  262         for (index = 0; index < ng_fec_units_len
  263             && ng_fec_units[index] == 0; index++);
  264         if (index == ng_fec_units_len) {                /* extend array */
  265                 int i, *newarray, newlen;
  266 
  267                 newlen = (2 * ng_fec_units_len) + 4;
  268                 MALLOC(newarray, int *, newlen * sizeof(*ng_fec_units),
  269                     M_NETGRAPH, M_NOWAIT);
  270                 if (newarray == NULL)
  271                         return (ENOMEM);
  272                 bcopy(ng_fec_units, newarray,
  273                     ng_fec_units_len * sizeof(*ng_fec_units));
  274                 for (i = ng_fec_units_len; i < newlen; i++)
  275                         newarray[i] = ~0;
  276                 if (ng_fec_units != NULL)
  277                         FREE(ng_fec_units, M_NETGRAPH);
  278                 ng_fec_units = newarray;
  279                 ng_fec_units_len = newlen;
  280         }
  281         bit = ffs(ng_fec_units[index]) - 1;
  282         KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1,
  283             ("%s: word=%d bit=%d", __FUNCTION__, ng_fec_units[index], bit));
  284         ng_fec_units[index] &= ~(1 << bit);
  285         *unit = (index * UNITS_BITSPERWORD) + bit;
  286         ng_units_in_use++;
  287         return (0);
  288 }
  289 
  290 /*
  291  * Free a no longer needed unit number.
  292  */
  293 static __inline__ void
  294 ng_fec_free_unit(int unit)
  295 {
  296         int index, bit;
  297 
  298         index = unit / UNITS_BITSPERWORD;
  299         bit = unit % UNITS_BITSPERWORD;
  300         KASSERT(index < ng_fec_units_len,
  301             ("%s: unit=%d len=%d", __FUNCTION__, unit, ng_fec_units_len));
  302         KASSERT((ng_fec_units[index] & (1 << bit)) == 0,
  303             ("%s: unit=%d is free", __FUNCTION__, unit));
  304         ng_fec_units[index] |= (1 << bit);
  305         /*
  306          * XXX We could think about reducing the size of ng_fec_units[]
  307          * XXX here if the last portion is all ones
  308          * XXX At least free it if no more units
  309          * Needed if we are to eventually be able to unload.
  310          */
  311         ng_units_in_use--;
  312         if (ng_units_in_use == 0) { /* XXX make SMP safe */
  313                 FREE(ng_fec_units, M_NETGRAPH);
  314                 ng_fec_units_len = 0;
  315                 ng_fec_units = NULL;
  316         }
  317 }
  318 
  319 /************************************************************************
  320                         INTERFACE STUFF
  321  ************************************************************************/
  322 
  323 static int
  324 ng_fec_addport(struct ng_fec_private *priv, char *iface)
  325 {
  326         struct ng_fec_bundle    *b;
  327         struct ifnet            *ifp, *bifp;
  328         struct arpcom           *ac;
  329         struct ifaddr           *ifa;
  330         struct sockaddr_dl      *sdl;
  331         struct ng_fec_portlist  *p, *new;
  332 
  333         if (priv == NULL || iface == NULL)
  334                 return(EINVAL);
  335 
  336         b = &priv->fec_bundle;
  337         ifp = &priv->arpcom.ac_if;
  338 
  339         /* Find the interface */
  340         bifp = ifunit(iface);
  341         if (bifp == NULL) {
  342                 printf("fec%d: tried to add iface %s, which "
  343                     "doesn't seem to exist\n", priv->unit, iface);
  344                 return(ENOENT);
  345         }
  346 
  347         /* See if we have room in the bundle */
  348         if (b->fec_ifcnt == FEC_BUNDLESIZ) {
  349                 printf("fec%d: can't add new iface; bundle is full\n",
  350                     priv->unit);
  351                 return(ENOSPC);
  352         }
  353 
  354         /* See if the interface is already in the bundle */
  355         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  356                 if (p->fec_if == bifp) {
  357                         printf("fec%d: iface %s is already in this "
  358                             "bundle\n", priv->unit, iface);
  359                         return(EINVAL);
  360                 }
  361         }
  362 
  363         /* Allocate new list entry. */
  364         MALLOC(new, struct ng_fec_portlist *,
  365             sizeof(struct ng_fec_portlist), M_NETGRAPH, M_NOWAIT);
  366         if (new == NULL)
  367                 return(ENOMEM);
  368 
  369         ac = (struct arpcom *)bifp;
  370         ac->ac_netgraph = priv->node;
  371 
  372         /*
  373          * If this is the first interface added to the bundle,
  374          * use its MAC address for the virtual interface (and,
  375          * by extension, all the other ports in the bundle).
  376          */
  377         if (b->fec_ifcnt == 0) {
  378                 ifa = TAILQ_FIRST(&ifp->if_addrhead);
  379                 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  380                 bcopy((char *)ac->ac_enaddr,
  381                     priv->arpcom.ac_enaddr, ETHER_ADDR_LEN);
  382                 bcopy((char *)ac->ac_enaddr,
  383                     LLADDR(sdl), ETHER_ADDR_LEN);
  384         }
  385 
  386         b->fec_btype = FEC_BTYPE_MAC;
  387         new->fec_idx = b->fec_ifcnt;
  388         b->fec_ifcnt++;
  389 
  390         /* Save the real MAC address. */
  391         bcopy((char *)ac->ac_enaddr,
  392             (char *)&new->fec_mac, ETHER_ADDR_LEN);
  393 
  394         /* Set up phony MAC address. */
  395         ifa = TAILQ_FIRST(&bifp->if_addrhead);
  396         sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  397         bcopy(priv->arpcom.ac_enaddr, ac->ac_enaddr, ETHER_ADDR_LEN);
  398         bcopy(priv->arpcom.ac_enaddr, LLADDR(sdl), ETHER_ADDR_LEN);
  399 
  400         /* Save original input vector */
  401         new->fec_if_input = bifp->if_input;
  402 
  403         /* Override it with our own */
  404         bifp->if_input = ng_fec_input;
  405 
  406         /* Add to the queue */
  407         new->fec_if = bifp;
  408         TAILQ_INSERT_TAIL(&b->ng_fec_ports, new, fec_list);
  409 
  410         return(0);
  411 }
  412 
  413 static int
  414 ng_fec_delport(struct ng_fec_private *priv, char *iface)
  415 {
  416         struct ng_fec_bundle    *b;
  417         struct ifnet            *ifp, *bifp;
  418         struct arpcom           *ac;
  419         struct ifaddr           *ifa;
  420         struct sockaddr_dl      *sdl;
  421         struct ng_fec_portlist  *p;
  422 
  423         if (priv == NULL || iface == NULL)
  424                 return(EINVAL);
  425 
  426         b = &priv->fec_bundle;
  427         ifp = &priv->arpcom.ac_if;
  428 
  429         /* Find the interface */
  430         bifp = ifunit(iface);
  431         if (bifp == NULL) {
  432                 printf("fec%d: tried to remove iface %s, which "
  433                     "doesn't seem to exist\n", priv->unit, iface);
  434                 return(ENOENT);
  435         }
  436 
  437         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  438                 if (p->fec_if == bifp)
  439                         break;
  440         }
  441 
  442         if (p == NULL) {
  443                 printf("fec%d: tried to remove iface %s which "
  444                     "is not in our bundle\n", priv->unit, iface);
  445                 return(EINVAL);
  446         }
  447 
  448         /* Stop interface */
  449         bifp->if_flags &= ~IFF_UP;
  450         (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
  451 
  452         /* Restore MAC address. */
  453         ac = (struct arpcom *)bifp;
  454         ifa = TAILQ_FIRST(&bifp->if_addrhead);
  455         sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  456         bcopy((char *)&p->fec_mac, ac->ac_enaddr, ETHER_ADDR_LEN);
  457         bcopy((char *)&p->fec_mac, LLADDR(sdl), ETHER_ADDR_LEN);
  458 
  459         /* Restore input vector */
  460         bifp->if_input = p->fec_if_input;
  461 
  462         /* Delete port */
  463         TAILQ_REMOVE(&b->ng_fec_ports, p, fec_list);
  464         FREE(p, M_NETGRAPH);
  465         b->fec_ifcnt--;
  466 
  467         return(0);
  468 }
  469 
  470 /*
  471  * Pass an ioctl command down to all the underyling interfaces in a
  472  * bundle. Used for setting multicast filters and flags.
  473  */
  474 
  475 static int 
  476 ng_fec_setport(struct ifnet *ifp, u_long command, caddr_t data)
  477 {
  478         struct ng_fec_private   *priv;
  479         struct ng_fec_bundle    *b;
  480         struct ifnet            *oifp;
  481         struct ng_fec_portlist  *p;
  482 
  483         priv = ifp->if_softc;
  484         b = &priv->fec_bundle;
  485 
  486         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  487                 oifp = p->fec_if;
  488                 if (oifp != NULL)
  489                         (*oifp->if_ioctl)(oifp, command, data);
  490         }
  491 
  492         return(0);
  493 }
  494 
  495 static void
  496 ng_fec_init(void *arg)
  497 {
  498         struct ng_fec_private   *priv;
  499         struct ng_fec_bundle    *b;
  500         struct ifnet            *ifp, *bifp;
  501         struct ng_fec_portlist  *p;
  502 
  503         ifp = arg;
  504         priv = ifp->if_softc;
  505         b = &priv->fec_bundle;
  506 
  507         if (b->fec_ifcnt == 1 || b->fec_ifcnt == 3) {
  508                 printf("fec%d: invalid bundle "
  509                     "size: %d\n", priv->unit,
  510                     b->fec_ifcnt);
  511                 return;
  512         }
  513 
  514         ng_fec_stop(ifp);
  515 
  516         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  517                 bifp = p->fec_if;
  518                 bifp->if_flags |= IFF_UP;
  519                 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
  520                 /* mark iface as up and let the monitor check it */
  521                 p->fec_ifstat = -1;
  522         }
  523 
  524         priv->fec_ch = timeout(ng_fec_tick, priv, hz);
  525 
  526         return;
  527 }
  528 
  529 static void
  530 ng_fec_stop(struct ifnet *ifp)
  531 {
  532         struct ng_fec_private   *priv;
  533         struct ng_fec_bundle    *b;
  534         struct ifnet            *bifp;
  535         struct ng_fec_portlist  *p;
  536 
  537         priv = ifp->if_softc;
  538         b = &priv->fec_bundle;
  539 
  540         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  541                 bifp = p->fec_if;
  542                 bifp->if_flags &= ~IFF_UP;
  543                 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
  544         }
  545 
  546         untimeout(ng_fec_tick, priv, priv->fec_ch);
  547 
  548         return;
  549 }
  550 
  551 static void
  552 ng_fec_tick(void *arg)
  553 {
  554         struct ng_fec_private   *priv;
  555         struct ng_fec_bundle    *b;
  556         struct ifmediareq       ifmr;
  557         struct ifnet            *ifp;
  558         struct ng_fec_portlist  *p;
  559         int                     error = 0;
  560 
  561         priv = arg;
  562         b = &priv->fec_bundle;
  563 
  564         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  565                 bzero((char *)&ifmr, sizeof(ifmr));
  566                 ifp = p->fec_if;
  567                 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr);
  568                 if (error) {
  569                         printf("fec%d: failed to check status "
  570                             "of link %s%d\n", priv->unit, ifp->if_name,
  571                             ifp->if_unit);
  572                         continue;
  573                 }
  574 
  575                 if (ifmr.ifm_status & IFM_AVALID &&
  576                     IFM_TYPE(ifmr.ifm_active) == IFM_ETHER) {
  577                         if (ifmr.ifm_status & IFM_ACTIVE) {
  578                                 if (p->fec_ifstat == -1 ||
  579                                     p->fec_ifstat == 0) {
  580                                         p->fec_ifstat = 1;
  581                                         printf("fec%d: port %s%d in bundle "
  582                                             "is up\n", priv->unit,
  583                                             ifp->if_name, ifp->if_unit);
  584                                 }
  585                         } else {
  586                                 if (p->fec_ifstat == -1 ||
  587                                     p->fec_ifstat == 1) {
  588                                         p->fec_ifstat = 0;
  589                                         printf("fec%d: port %s%d in bundle "
  590                                             "is down\n", priv->unit,
  591                                             ifp->if_name, ifp->if_unit);
  592                                 }
  593                         }
  594                 }
  595         }
  596 
  597         ifp = &priv->arpcom.ac_if;
  598         if (ifp->if_flags & IFF_RUNNING)
  599                 priv->fec_ch = timeout(ng_fec_tick, priv, hz);
  600 
  601         return;
  602 }
  603 
  604 static int
  605 ng_fec_ifmedia_upd(struct ifnet *ifp)
  606 {
  607         return(0);
  608 }
  609 
  610 static void ng_fec_ifmedia_sts(struct ifnet *ifp,
  611         struct ifmediareq *ifmr)
  612 {
  613         struct ng_fec_private   *priv;
  614         struct ng_fec_bundle    *b;
  615         struct ng_fec_portlist  *p;
  616 
  617         priv = ifp->if_softc;
  618         b = &priv->fec_bundle;
  619 
  620         ifmr->ifm_status = IFM_AVALID;
  621         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  622                 if (p->fec_ifstat) {
  623                         ifmr->ifm_status |= IFM_ACTIVE;
  624                         break;
  625                 }
  626         }
  627 
  628         return;
  629 }
  630 
  631 /*
  632  * Process an ioctl for the virtual interface
  633  */
  634 static int
  635 ng_fec_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
  636 {
  637         struct ifreq *const ifr = (struct ifreq *) data;
  638         int s, error = 0;
  639         struct ng_fec_private   *priv;
  640         struct ng_fec_bundle    *b;
  641 
  642         priv = ifp->if_softc;
  643         b = &priv->fec_bundle;
  644 
  645 #ifdef DEBUG
  646         ng_fec_print_ioctl(ifp, command, data);
  647 #endif
  648         s = splimp();
  649         switch (command) {
  650 
  651         /* These two are mostly handled at a higher layer */
  652         case SIOCSIFADDR:
  653         case SIOCGIFADDR:
  654         case SIOCSIFMTU:
  655                 error = ether_ioctl(ifp, command, data);
  656                 break;
  657 
  658         /* Set flags */
  659         case SIOCSIFFLAGS:
  660                 /*
  661                  * If the interface is marked up and stopped, then start it.
  662                  * If it is marked down and running, then stop it.
  663                  */
  664                 if (ifr->ifr_flags & IFF_UP) {
  665                         if (!(ifp->if_flags & IFF_RUNNING)) {
  666                                 /* Sanity. */
  667                                 if (b->fec_ifcnt == 1 || b->fec_ifcnt == 3) {
  668                                         printf("fec%d: invalid bundle "
  669                                             "size: %d\n", priv->unit,
  670                                             b->fec_ifcnt);
  671                                         error = EINVAL;
  672                                         break;
  673                                 }
  674                                 ifp->if_flags &= ~(IFF_OACTIVE);
  675                                 ifp->if_flags |= IFF_RUNNING;
  676                                 ng_fec_init(ifp);
  677                         }
  678                         /*
  679                          * Bubble down changes in promisc mode to
  680                          * underlying interfaces.
  681                          */
  682                         if ((ifp->if_flags & IFF_PROMISC) !=
  683                             (priv->if_flags & IFF_PROMISC)) {
  684                                 ng_fec_setport(ifp, command, data);
  685                                 priv->if_flags = ifp->if_flags;
  686                         }
  687                 } else {
  688                         if (ifp->if_flags & IFF_RUNNING)
  689                                 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
  690                         ng_fec_stop(ifp);
  691                 }
  692                 break;
  693 
  694         case SIOCADDMULTI:
  695         case SIOCDELMULTI:
  696                 ng_fec_setport(ifp, command, data);
  697                 error = 0;
  698                 break;
  699         case SIOCGIFMEDIA:
  700         case SIOCSIFMEDIA:
  701                 error = ifmedia_ioctl(ifp, ifr, &priv->ifmedia, command);
  702                 break;
  703         /* Stuff that's not supported */
  704         case SIOCSIFPHYS:
  705                 error = EOPNOTSUPP;
  706                 break;
  707 
  708         default:
  709                 error = EINVAL;
  710                 break;
  711         }
  712         (void) splx(s);
  713         return (error);
  714 }
  715 
  716 /*
  717  * This routine spies on mbufs received by underlying network device
  718  * drivers. When we add an interface to our bundle, we override its
  719  * if_input routine with a pointer to ng_fec_input(). This means we
  720  * get to look at all the device's packets before sending them to the
  721  * real ether_input() for processing by the stack. Once we verify the
  722  * packet comes from an interface that's been aggregated into
  723  * our bundle, we fix up the rcvif pointer and increment our
  724  * packet counters so that it looks like the frames are actually
  725  * coming from us.
  726  */
  727 static void 
  728 ng_fec_input(struct ifnet *ifp, struct mbuf *m0)
  729 {
  730         struct ng_node          *node;
  731         struct ng_fec_private   *priv;
  732         struct ng_fec_bundle    *b;
  733         struct ifnet            *bifp;
  734         struct ng_fec_portlist  *p;
  735 
  736         /* Sanity check */
  737         if (ifp == NULL || m0 == NULL)
  738                 return;
  739 
  740         node = IFP2NG(ifp);
  741 
  742         /* Sanity check part II */
  743         if (node == NULL)
  744                 return;
  745 
  746         priv = NG_NODE_PRIVATE(node);
  747         b = &priv->fec_bundle;
  748         bifp = &priv->arpcom.ac_if;
  749 
  750         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  751                 if (p->fec_if == m0->m_pkthdr.rcvif)
  752                         break;
  753         }
  754 
  755         /* Wasn't meant for us; leave this frame alone. */
  756         if (p == NULL)
  757                 return;
  758 
  759         /*
  760          * Check for a BPF tap on the underlying interface. This
  761          * is mainly a debugging aid: it allows tcpdump-ing of an
  762          * individual interface in a bundle to work, which it
  763          * otherwise would not. BPF tapping of our own aggregate
  764          * interface will occur once we call ether_input().
  765          */
  766         BPF_MTAP(m0->m_pkthdr.rcvif, m0);
  767 
  768         /* Convince the system that this is our frame. */
  769         m0->m_pkthdr.rcvif = bifp;
  770         bifp->if_ipackets++;
  771         bifp->if_ibytes += m0->m_pkthdr.len + sizeof(struct ether_header);
  772 
  773         (*bifp->if_input)(bifp, m0);
  774 
  775         return;
  776 }
  777 
  778 /*
  779  * Take a quick peek at the packet and see if it's ok for us to use
  780  * the inet or inet6 hash methods on it, if they're enabled. We do
  781  * this by setting flags in the mbuf header. Once we've made up our
  782  * mind what to do, we pass the frame to ether_output() for further
  783  * processing.
  784  */
  785 
  786 static int
  787 ng_fec_output(struct ifnet *ifp, struct mbuf *m,
  788                 struct sockaddr *dst, struct rtentry *rt0)
  789 {
  790         const priv_p priv = (priv_p) ifp->if_softc;
  791         struct ng_fec_bundle *b;
  792         int error;
  793 
  794         /* Check interface flags */
  795         if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
  796                 m_freem(m);
  797                 return (ENETDOWN);
  798         }
  799 
  800         b = &priv->fec_bundle;
  801 
  802         switch (b->fec_btype) {
  803         case FEC_BTYPE_MAC:
  804                 m->m_flags |= M_FEC_MAC;
  805                 break;
  806 #ifdef INET
  807         case FEC_BTYPE_INET:
  808                 /*
  809                  * We can't use the INET address port selection
  810                  * scheme if this isn't an INET packet.
  811                  */
  812                 if (dst->sa_family == AF_INET)
  813                         m->m_flags |= M_FEC_INET;
  814 #ifdef INET6
  815                 else if (dst->sa_family == AF_INET6)
  816                         m->m_flags |= M_FEC_INET6;
  817 #endif
  818                 else {
  819 #ifdef DEBUG
  820                         printf("fec%d: can't do inet aggregation of non "
  821                             "inet packet\n", ifp->if_unit);
  822 #endif
  823                         m->m_flags |= M_FEC_MAC;
  824                 }
  825                 break;
  826 #endif
  827         default:
  828                 printf("fec%d: bogus hash type: %d\n", ifp->if_unit,
  829                     b->fec_btype);
  830                 m_freem(m);
  831                 return(EINVAL);
  832                 break;
  833         }
  834 
  835         /*
  836          * Pass the frame to ether_output() for all the protocol
  837          * handling. This will put the ethernet header on the packet
  838          * for us.
  839          */
  840         priv->if_error = 0;
  841         error = ether_output(ifp, m, dst, rt0);
  842         if (priv->if_error && !error)
  843                 error = priv->if_error;
  844 
  845         return(error);
  846 }
  847 
  848 /*
  849  * Apply a hash to the source and destination addresses in the packet
  850  * in order to select an interface. Also check link status and handle
  851  * dead links accordingly.
  852  */
  853 
  854 static int
  855 ng_fec_choose_port(struct ng_fec_bundle *b,
  856         struct mbuf *m, struct ifnet **ifp)
  857 {
  858         struct ether_header     *eh;
  859         struct mbuf             *m0;
  860 #ifdef INET
  861         struct ip               *ip;
  862 #ifdef INET6
  863         struct ip6_hdr          *ip6;
  864 #endif
  865 #endif
  866 
  867         struct ng_fec_portlist  *p;
  868         int                     port = 0, mask;
  869 
  870         /*
  871          * If there are only two ports, mask off all but the
  872          * last bit for XORing. If there are 4, mask off all
  873          * but the last 2 bits.
  874          */
  875         mask = b->fec_ifcnt == 2 ? 0x1 : 0x3;
  876         eh = mtod(m, struct ether_header *);
  877 #ifdef INET
  878         ip = (struct ip *)(mtod(m, char *) +
  879             sizeof(struct ether_header));
  880 #ifdef INET6
  881         ip6 = (struct ip6_hdr *)(mtod(m, char *) +
  882             sizeof(struct ether_header));
  883 #endif
  884 #endif
  885 
  886         /*
  887          * The fg_fec_output() routine is supposed to leave a
  888          * flag for us in the mbuf that tells us what hash to
  889          * use, but sometimes a new mbuf is prepended to the
  890          * chain, so we have to search every mbuf in the chain
  891          * to find the flags.
  892          */
  893         m0 = m;
  894         while (m0) {
  895                 if (m0->m_flags & (M_FEC_MAC|M_FEC_INET|M_FEC_INET6))
  896                         break;
  897                 m0 = m0->m_next;
  898         }
  899         if (m0 == NULL)
  900                 return(EINVAL);
  901 
  902         switch (m0->m_flags & (M_FEC_MAC|M_FEC_INET|M_FEC_INET6)) {
  903         case M_FEC_MAC:
  904                 port = (eh->ether_dhost[5] ^
  905                     eh->ether_shost[5]) & mask;
  906                 break;
  907 #ifdef INET
  908         case M_FEC_INET:
  909                 port = (ntohl(ip->ip_dst.s_addr) ^
  910                     ntohl(ip->ip_src.s_addr)) & mask;
  911                 break;
  912 #ifdef INET6
  913         case M_FEC_INET6:
  914                 port = (ip6->ip6_dst.s6_addr[15] ^
  915                     ip6->ip6_dst.s6_addr[15]) & mask;
  916                 break;
  917 #endif
  918 #endif
  919         default:
  920                 return(EINVAL);
  921                         break;
  922         }
  923 
  924         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  925                 if (port == p->fec_idx)
  926                         break;
  927         }
  928 
  929         /*
  930          * Now that we've chosen a port, make sure it's
  931          * alive. If it's not alive, cycle through the bundle
  932          * looking for a port that is alive. If we don't find
  933          * any, return an error.
  934          */
  935         if (p->fec_ifstat != 1) {
  936                 struct ng_fec_portlist  *n = NULL;
  937 
  938                 n = TAILQ_NEXT(p, fec_list);
  939                 if (n == NULL)
  940                         n = TAILQ_FIRST(&b->ng_fec_ports);
  941                 while (n != p) {
  942                         if (n->fec_ifstat == 1)
  943                                 break;
  944                         n = TAILQ_NEXT(n, fec_list);
  945                         if (n == NULL)
  946                                 n = TAILQ_FIRST(&b->ng_fec_ports);
  947                 }
  948                 if (n == p)
  949                         return(EAGAIN);
  950                 p = n;
  951         }
  952 
  953         *ifp = p->fec_if;
  954 
  955         return(0);
  956 }
  957 
  958 /*
  959  * Now that the packet has been run through ether_output(), yank it
  960  * off our own send queue and stick it on the queue for the appropriate
  961  * underlying physical interface. Note that if the interface's send
  962  * queue is full, we save an error status in our private netgraph
  963  * space which will eventually be handed up to ng_fec_output(), which
  964  * will return it to the rest of the IP stack. We need to do this
  965  * in order to duplicate the effect of ether_output() returning ENOBUFS
  966  * when it detects that an interface's send queue is full. There's no
  967  * other way to signal the error status from here since the if_start()
  968  * routine is spec'ed to return void.
  969  *
  970  * Once the frame is queued, we call ether_output_frame() to initiate
  971  * transmission.
  972  */
  973 static void
  974 ng_fec_start(struct ifnet *ifp)
  975 {
  976         struct ng_fec_private   *priv;
  977         struct ng_fec_bundle    *b;
  978         struct ifnet            *oifp = NULL;
  979         struct mbuf             *m0;
  980         int                     error;
  981 
  982         priv = ifp->if_softc;
  983         b = &priv->fec_bundle;
  984 
  985         IF_DEQUEUE(&ifp->if_snd, m0);
  986         if (m0 == NULL)
  987                 return;
  988 
  989         BPF_MTAP(ifp, m0);
  990 
  991         /* Queue up packet on the proper port. */
  992         error = ng_fec_choose_port(b, m0, &oifp);
  993         if (error) {
  994                 ifp->if_ierrors++;
  995                 m_freem(m0);
  996                 priv->if_error = ENOBUFS;
  997                 return;
  998         }
  999         ifp->if_opackets++;
 1000 
 1001         priv->if_error = ether_output_frame(oifp, m0);
 1002 
 1003         return;
 1004 }
 1005 
 1006 #ifdef DEBUG
 1007 /*
 1008  * Display an ioctl to the virtual interface
 1009  */
 1010 
 1011 static void
 1012 ng_fec_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
 1013 {
 1014         char   *str;
 1015 
 1016         switch (command & IOC_DIRMASK) {
 1017         case IOC_VOID:
 1018                 str = "IO";
 1019                 break;
 1020         case IOC_OUT:
 1021                 str = "IOR";
 1022                 break;
 1023         case IOC_IN:
 1024                 str = "IOW";
 1025                 break;
 1026         case IOC_INOUT:
 1027                 str = "IORW";
 1028                 break;
 1029         default:
 1030                 str = "IO??";
 1031         }
 1032         log(LOG_DEBUG, "%s%d: %s('%c', %d, char[%d])\n",
 1033                ifp->if_name, ifp->if_unit,
 1034                str,
 1035                IOCGROUP(command),
 1036                command & 0xff,
 1037                IOCPARM_LEN(command));
 1038 }
 1039 #endif /* DEBUG */
 1040 
 1041 /************************************************************************
 1042                         NETGRAPH NODE STUFF
 1043  ************************************************************************/
 1044 
 1045 /*
 1046  * Constructor for a node
 1047  */
 1048 static int
 1049 ng_fec_constructor(node_p node)
 1050 {
 1051         char ifname[NG_FEC_FEC_NAME_MAX + 1];
 1052         struct ifnet *ifp;
 1053         priv_p priv;
 1054         struct ng_fec_bundle *b;
 1055         int error = 0;
 1056 
 1057         /* Allocate node and interface private structures */
 1058         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT);
 1059         if (priv == NULL)
 1060                 return (ENOMEM);
 1061         bzero(priv, sizeof(*priv));
 1062 
 1063         ifp = &priv->arpcom.ac_if;
 1064         b = &priv->fec_bundle;
 1065 
 1066         /* Link them together */
 1067         ifp->if_softc = priv;
 1068 
 1069         /* Get an interface unit number */
 1070         if ((error = ng_fec_get_unit(&priv->unit)) != 0) {
 1071                 FREE(ifp, M_NETGRAPH);
 1072                 FREE(priv, M_NETGRAPH);
 1073                 return (error);
 1074         }
 1075 
 1076         /* Link together node and private info */
 1077         NG_NODE_SET_PRIVATE(node, priv);
 1078         priv->node = node;
 1079         priv->arpcom.ac_netgraph = node;
 1080 
 1081         /* Initialize interface structure */
 1082         ifp->if_name = NG_FEC_FEC_NAME;
 1083         ifp->if_unit = priv->unit;
 1084         ifp->if_start = ng_fec_start;
 1085         ifp->if_ioctl = ng_fec_ioctl;
 1086         ifp->if_init = ng_fec_init;
 1087         ifp->if_watchdog = NULL;
 1088         ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
 1089         ifp->if_mtu = NG_FEC_MTU_DEFAULT;
 1090         ifp->if_flags = (IFF_SIMPLEX|IFF_BROADCAST|IFF_MULTICAST);
 1091         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
 1092         ifp->if_addrlen = 0;                    /* XXX */
 1093         ifp->if_hdrlen = 0;                     /* XXX */
 1094         ifp->if_baudrate = 100000000;           /* XXX */
 1095         TAILQ_INIT(&ifp->if_addrhead);
 1096 
 1097         /* Give this node the same name as the interface (if possible) */
 1098         bzero(ifname, sizeof(ifname));
 1099         snprintf(ifname, sizeof(ifname), "%s%d", ifp->if_name, ifp->if_unit);
 1100         if (ng_name_node(node, ifname) != 0)
 1101                 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname);
 1102 
 1103         /* Attach the interface */
 1104         ether_ifattach(ifp, priv->arpcom.ac_enaddr);
 1105         callout_handle_init(&priv->fec_ch);
 1106 
 1107         /* Override output method with our own */
 1108         ifp->if_output = ng_fec_output;
 1109 
 1110         TAILQ_INIT(&b->ng_fec_ports);
 1111         b->fec_ifcnt = 0;
 1112 
 1113         ifmedia_init(&priv->ifmedia, 0,
 1114             ng_fec_ifmedia_upd, ng_fec_ifmedia_sts);
 1115         ifmedia_add(&priv->ifmedia, IFM_ETHER|IFM_NONE, 0, NULL);
 1116         ifmedia_set(&priv->ifmedia, IFM_ETHER|IFM_NONE);
 1117 
 1118         /* Done */
 1119         return (0);
 1120 }
 1121 
 1122 /*
 1123  * Receive a control message
 1124  */
 1125 static int
 1126 ng_fec_rcvmsg(node_p node, item_p item, hook_p lasthook)
 1127 {
 1128         const priv_p priv = NG_NODE_PRIVATE(node);
 1129         struct ng_fec_bundle    *b;
 1130         struct ng_mesg *resp = NULL;
 1131         struct ng_mesg *msg;
 1132         char *ifname;
 1133         int error = 0;
 1134 
 1135         NGI_GET_MSG(item, msg);
 1136         b = &priv->fec_bundle;
 1137 
 1138         switch (msg->header.typecookie) {
 1139         case NGM_FEC_COOKIE:
 1140                 switch (msg->header.cmd) {
 1141                 case NGM_FEC_ADD_IFACE:
 1142                         ifname = msg->data;
 1143                         error = ng_fec_addport(priv, ifname);
 1144                         break;
 1145                 case NGM_FEC_DEL_IFACE:
 1146                         ifname = msg->data;
 1147                         error = ng_fec_delport(priv, ifname);
 1148                         break;
 1149                 case NGM_FEC_SET_MODE_MAC:
 1150                         b->fec_btype = FEC_BTYPE_MAC;
 1151                         break;
 1152 #ifdef INET
 1153                 case NGM_FEC_SET_MODE_INET:
 1154                         b->fec_btype = FEC_BTYPE_INET;
 1155                         break;
 1156 #ifdef INET6
 1157                 case NGM_FEC_SET_MODE_INET6:
 1158                         b->fec_btype = FEC_BTYPE_INET6;
 1159                         break;
 1160 #endif
 1161 #endif
 1162                 default:
 1163                         error = EINVAL;
 1164                         break;
 1165                 }
 1166                 break;
 1167         default:
 1168                 error = EINVAL;
 1169                 break;
 1170         }
 1171         NG_RESPOND_MSG(error, node, item, resp);
 1172         NG_FREE_MSG(msg);
 1173         return (error);
 1174 }
 1175 
 1176 /*
 1177  * Shutdown and remove the node and its associated interface.
 1178  */
 1179 static int
 1180 ng_fec_shutdown(node_p node)
 1181 {
 1182         const priv_p priv = NG_NODE_PRIVATE(node);
 1183         struct ng_fec_bundle *b;
 1184         struct ng_fec_portlist  *p;
 1185         char ifname[IFNAMSIZ];
 1186 
 1187         b = &priv->fec_bundle;
 1188         ng_fec_stop(&priv->arpcom.ac_if);
 1189 
 1190         while (!TAILQ_EMPTY(&b->ng_fec_ports)) {
 1191                 p = TAILQ_FIRST(&b->ng_fec_ports);
 1192                 sprintf(ifname, "%s%d",
 1193                     p->fec_if->if_name,
 1194                     p->fec_if->if_unit);
 1195                 ng_fec_delport(priv, ifname);
 1196         }
 1197 
 1198         ether_ifdetach(&priv->arpcom.ac_if);
 1199         ifmedia_removeall(&priv->ifmedia);
 1200         ng_fec_free_unit(priv->unit);
 1201         FREE(priv, M_NETGRAPH);
 1202         NG_NODE_SET_PRIVATE(node, NULL);
 1203         NG_NODE_UNREF(node);
 1204         return (0);
 1205 }

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