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

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    1 /*
    2  * ng_fec.c
    3  */
    4 
    5 /*-
    6  * Copyright (c) 2001 Berkeley Software Design, Inc.
    7  * Copyright (c) 2000, 2001
    8  *      Bill Paul <wpaul@osd.bsdi.com>.  All rights reserved.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by Bill Paul.
   21  * 4. Neither the name of the author nor the names of any co-contributors
   22  *    may be used to endorse or promote products derived from this software
   23  *    without specific prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   28  * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
   29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   35  * THE POSSIBILITY OF SUCH DAMAGE.
   36  *
   37  * $FreeBSD: releng/8.3/sys/netgraph/ng_fec.c 215342 2010-11-15 17:48:13Z sobomax $
   38  */
   39 /*-
   40  * Copyright (c) 1996-1999 Whistle Communications, Inc.
   41  * All rights reserved.
   42  * 
   43  * Subject to the following obligations and disclaimer of warranty, use and
   44  * redistribution of this software, in source or object code forms, with or
   45  * without modifications are expressly permitted by Whistle Communications;
   46  * provided, however, that:
   47  * 1. Any and all reproductions of the source or object code must include the
   48  *    copyright notice above and the following disclaimer of warranties; and
   49  * 2. No rights are granted, in any manner or form, to use Whistle
   50  *    Communications, Inc. trademarks, including the mark "WHISTLE
   51  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   52  *    such appears in the above copyright notice or in the software.
   53  * 
   54  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   55  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   56  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   57  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   58  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   59  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   60  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   61  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   62  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   63  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   64  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   65  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   66  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   67  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   68  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   69  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   70  * OF SUCH DAMAGE.
   71  *
   72  * Author: Archie Cobbs <archie@freebsd.org>
   73  *
   74  * $Whistle: ng_fec.c,v 1.33 1999/11/01 09:24:51 julian Exp $
   75  */
   76 
   77 /*
   78  * This module implements ethernet channel bonding using the Cisco
   79  * Fast EtherChannel mechanism. Two or four ports may be combined
   80  * into a single aggregate interface.
   81  *
   82  * Interfaces are named fec0, fec1, etc.  New nodes take the
   83  * first available interface name.
   84  *
   85  * This node also includes Berkeley packet filter support.
   86  *
   87  * Note that this node doesn't need to connect to any other
   88  * netgraph nodes in order to do its work.
   89  */
   90 
   91 #include <sys/param.h>
   92 #include <sys/systm.h>
   93 #include <sys/errno.h>
   94 #include <sys/kernel.h>
   95 #include <sys/malloc.h>
   96 #include <sys/mbuf.h>
   97 #include <sys/errno.h>
   98 #include <sys/sockio.h>
   99 #include <sys/socket.h>
  100 #include <sys/syslog.h>
  101 #include <sys/libkern.h>
  102 #include <sys/queue.h>
  103 
  104 #include <net/if.h>
  105 #include <net/if_dl.h>
  106 #include <net/if_types.h>
  107 #include <net/if_media.h>
  108 #include <net/bpf.h>
  109 #include <net/ethernet.h>
  110 #include <net/route.h>
  111 
  112 #include "opt_inet.h"
  113 #include "opt_inet6.h"
  114 
  115 #include <netinet/in.h>
  116 #ifdef INET
  117 #include <netinet/in_systm.h>
  118 #include <netinet/ip.h>
  119 #endif
  120 
  121 #ifdef INET6
  122 #include <netinet/ip6.h>
  123 #endif
  124 
  125 #include <netgraph/ng_message.h>
  126 #include <netgraph/netgraph.h>
  127 #include <netgraph/ng_parse.h>
  128 #include <netgraph/ng_fec.h>
  129 
  130 /*
  131  * We need a way to stash a pointer to our netgraph node in the
  132  * ifnet structure so that receive handling works. As far as I can
  133  * tell, although there is an AF_NETGRAPH address family, it's only
  134  * used to identify sockaddr_ng structures: there is no netgraph address
  135  * family domain. This means the AF_NETGRAPH entry in ifp->if_afdata
  136  * should be unused, so we can use to hold our node context.
  137  */
  138 #define IFP2NG(ifp)     ((ifp)->if_afdata[AF_NETGRAPH])
  139 
  140 /*
  141  * Current fast etherchannel implementations use either 2 or 4
  142  * ports, so for now we limit the maximum bundle size to 4 interfaces.
  143  */
  144 #define FEC_BUNDLESIZ   4
  145 
  146 struct ng_fec_portlist {
  147         struct ifnet            *fec_if;
  148         void                    (*fec_if_input) (struct ifnet *,
  149                                                  struct mbuf *);
  150         int                     fec_idx;
  151         int                     fec_ifstat;
  152         struct ether_addr       fec_mac;
  153         SLIST_HEAD(__mclhd, ng_fec_mc)  fec_mc_head;
  154         TAILQ_ENTRY(ng_fec_portlist) fec_list;
  155 };
  156 
  157 struct ng_fec_mc {
  158         struct ifmultiaddr      *mc_ifma;
  159         SLIST_ENTRY(ng_fec_mc)    mc_entries;
  160 };
  161 
  162 struct ng_fec_bundle {
  163         TAILQ_HEAD(,ng_fec_portlist) ng_fec_ports;
  164         int                     fec_ifcnt;
  165         int                     fec_btype;
  166         int                     (*fec_if_output) (struct ifnet *,
  167                                                   struct mbuf *,
  168                                                   struct sockaddr *,
  169                                                   struct route *);
  170 };
  171 
  172 #define FEC_BTYPE_MAC           0x01
  173 #define FEC_BTYPE_INET          0x02
  174 #define FEC_BTYPE_INET6         0x03
  175 
  176 /* Node private data */
  177 struct ng_fec_private {
  178         struct ifnet *ifp;
  179         struct ifmedia ifmedia;
  180         int     if_flags;
  181         int     if_error;               /* XXX */
  182         int     unit;                   /* Interface unit number */
  183         node_p  node;                   /* Our netgraph node */
  184         struct ng_fec_bundle fec_bundle;/* Aggregate bundle */
  185         struct callout_handle fec_ch;   /* callout handle for ticker */
  186 };
  187 typedef struct ng_fec_private *priv_p;
  188 
  189 /* Interface methods */
  190 static void     ng_fec_input(struct ifnet *, struct mbuf *);
  191 static void     ng_fec_start(struct ifnet *ifp);
  192 static int      ng_fec_choose_port(struct ng_fec_bundle *b,
  193                         struct mbuf *m, struct ifnet **ifp);
  194 static int      ng_fec_setport(struct ifnet *ifp, u_long cmd, caddr_t data);
  195 static void     ng_fec_init(void *arg);
  196 static void     ng_fec_stop(struct ifnet *ifp);
  197 static int      ng_fec_ifmedia_upd(struct ifnet *ifp);
  198 static void     ng_fec_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr);
  199 static int      ng_fec_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
  200 static int      ng_fec_output(struct ifnet *ifp, struct mbuf *m0,
  201                         struct sockaddr *dst, struct route *ro);
  202 static void     ng_fec_tick(void *arg);
  203 static int      ng_fec_addport(struct ng_fec_private *priv, char *iface);
  204 static int      ng_fec_delport(struct ng_fec_private *priv, char *iface);
  205 static int      ng_fec_ether_cmdmulti(struct ifnet *trifp, struct ng_fec_portlist *p, int set);
  206 
  207 #ifdef DEBUG
  208 static void     ng_fec_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
  209 #endif
  210 
  211 /* Netgraph methods */
  212 static int              ng_fec_mod_event(module_t, int, void *);
  213 static ng_constructor_t ng_fec_constructor;
  214 static ng_rcvmsg_t      ng_fec_rcvmsg;
  215 static ng_shutdown_t    ng_fec_shutdown;
  216 
  217 /* List of commands and how to convert arguments to/from ASCII */
  218 static const struct ng_cmdlist ng_fec_cmds[] = {
  219         {
  220           NGM_FEC_COOKIE,
  221           NGM_FEC_ADD_IFACE,
  222           "add_iface",
  223           &ng_parse_string_type,
  224           NULL,
  225         },
  226         {
  227           NGM_FEC_COOKIE,
  228           NGM_FEC_DEL_IFACE,
  229           "del_iface",
  230           &ng_parse_string_type,
  231           NULL,
  232         },
  233         {
  234           NGM_FEC_COOKIE,
  235           NGM_FEC_SET_MODE_MAC,
  236           "set_mode_mac",
  237           NULL,
  238           NULL,
  239         },
  240         {
  241           NGM_FEC_COOKIE,
  242           NGM_FEC_SET_MODE_INET,
  243           "set_mode_inet",
  244           NULL,
  245           NULL,
  246         },
  247         { 0 }
  248 };
  249 
  250 /* Node type descriptor */
  251 static struct ng_type typestruct = {
  252         .version =      NG_ABI_VERSION,
  253         .name =         NG_FEC_NODE_TYPE,
  254         .mod_event =    ng_fec_mod_event,
  255         .constructor =  ng_fec_constructor,
  256         .rcvmsg =       ng_fec_rcvmsg,
  257         .shutdown =     ng_fec_shutdown,
  258         .cmdlist =      ng_fec_cmds,
  259 };
  260 NETGRAPH_INIT(fec, &typestruct);
  261 
  262 /* We keep a bitmap indicating which unit numbers are free.
  263    One means the unit number is free, zero means it's taken. */
  264 static int      *ng_fec_units = NULL;
  265 static int      ng_fec_units_len = 0;
  266 static int      ng_units_in_use = 0;
  267 
  268 #define UNITS_BITSPERWORD       (sizeof(*ng_fec_units) * NBBY)
  269 
  270 static struct mtx       ng_fec_mtx;
  271 
  272 /*
  273  * Find the first free unit number for a new interface.
  274  * Increase the size of the unit bitmap as necessary.
  275  */
  276 static __inline int
  277 ng_fec_get_unit(int *unit)
  278 {
  279         int index, bit;
  280 
  281         mtx_lock(&ng_fec_mtx);
  282         for (index = 0; index < ng_fec_units_len
  283             && ng_fec_units[index] == 0; index++);
  284         if (index == ng_fec_units_len) {                /* extend array */
  285                 int i, *newarray, newlen;
  286 
  287                 newlen = (2 * ng_fec_units_len) + 4;
  288                 newarray = malloc(newlen * sizeof(*ng_fec_units),
  289                     M_NETGRAPH, M_NOWAIT);
  290                 if (newarray == NULL) {
  291                         mtx_unlock(&ng_fec_mtx);
  292                         return (ENOMEM);
  293                 }
  294                 bcopy(ng_fec_units, newarray,
  295                     ng_fec_units_len * sizeof(*ng_fec_units));
  296                 for (i = ng_fec_units_len; i < newlen; i++)
  297                         newarray[i] = ~0;
  298                 if (ng_fec_units != NULL)
  299                         free(ng_fec_units, M_NETGRAPH);
  300                 ng_fec_units = newarray;
  301                 ng_fec_units_len = newlen;
  302         }
  303         bit = ffs(ng_fec_units[index]) - 1;
  304         KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1,
  305             ("%s: word=%d bit=%d", __func__, ng_fec_units[index], bit));
  306         ng_fec_units[index] &= ~(1 << bit);
  307         *unit = (index * UNITS_BITSPERWORD) + bit;
  308         ng_units_in_use++;
  309         mtx_unlock(&ng_fec_mtx);
  310         return (0);
  311 }
  312 
  313 /*
  314  * Free a no longer needed unit number.
  315  */
  316 static __inline void
  317 ng_fec_free_unit(int unit)
  318 {
  319         int index, bit;
  320 
  321         index = unit / UNITS_BITSPERWORD;
  322         bit = unit % UNITS_BITSPERWORD;
  323         mtx_lock(&ng_fec_mtx);
  324         KASSERT(index < ng_fec_units_len,
  325             ("%s: unit=%d len=%d", __func__, unit, ng_fec_units_len));
  326         KASSERT((ng_fec_units[index] & (1 << bit)) == 0,
  327             ("%s: unit=%d is free", __func__, unit));
  328         ng_fec_units[index] |= (1 << bit);
  329         /*
  330          * XXX We could think about reducing the size of ng_fec_units[]
  331          * XXX here if the last portion is all ones
  332          * XXX At least free it if no more units
  333          * Needed if we are to eventually be able to unload.
  334          */
  335         ng_units_in_use--;
  336         if (ng_units_in_use == 0) { /* XXX make SMP safe */
  337                 free(ng_fec_units, M_NETGRAPH);
  338                 ng_fec_units_len = 0;
  339                 ng_fec_units = NULL;
  340         }
  341         mtx_unlock(&ng_fec_mtx);
  342 }
  343 
  344 /************************************************************************
  345                         INTERFACE STUFF
  346  ************************************************************************/
  347 
  348 static int
  349 ng_fec_addport(struct ng_fec_private *priv, char *iface)
  350 {
  351         struct ng_fec_bundle    *b;
  352         struct ifnet            *ifp, *bifp;
  353         struct ng_fec_portlist  *p, *new;
  354 
  355         if (priv == NULL || iface == NULL)
  356                 return(EINVAL);
  357 
  358         b = &priv->fec_bundle;
  359         ifp = priv->ifp;
  360 
  361         /* Only allow reconfiguration if not running. */
  362         if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
  363                 printf("fec%d: can't add new iface; bundle is running\n",
  364                     priv->unit);
  365                 return (EINVAL);
  366         }
  367 
  368         /* Find the interface */
  369         bifp = ifunit(iface);
  370         if (bifp == NULL) {
  371                 printf("fec%d: tried to add iface %s, which "
  372                     "doesn't seem to exist\n", priv->unit, iface);
  373                 return(ENOENT);
  374         }
  375 
  376         /* See if we have room in the bundle */
  377         if (b->fec_ifcnt == FEC_BUNDLESIZ) {
  378                 printf("fec%d: can't add new iface; bundle is full\n",
  379                     priv->unit);
  380                 return(ENOSPC);
  381         }
  382 
  383         /* See if the interface is already in the bundle */
  384         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  385                 if (p->fec_if == bifp) {
  386                         printf("fec%d: iface %s is already in this "
  387                             "bundle\n", priv->unit, iface);
  388                         return(EINVAL);
  389                 }
  390         }
  391 
  392         /*
  393          * All interfaces must use the same output vector. Once the
  394          * user attaches an interface of one type, make all subsequent
  395          * interfaces have the same output vector.
  396          */
  397         if (b->fec_if_output != NULL) {
  398                 if (b->fec_if_output != bifp->if_output) {
  399                         printf("fec%d: iface %s is not the same type "
  400                             "as the other interface(s) already in "
  401                             "the bundle\n", priv->unit, iface);
  402                         return(EINVAL);
  403                 }
  404         }
  405 
  406         /* Allocate new list entry. */
  407         new = malloc(sizeof(struct ng_fec_portlist), M_NETGRAPH, M_NOWAIT);
  408         if (new == NULL)
  409                 return(ENOMEM);
  410 
  411         IF_AFDATA_LOCK(bifp);
  412         IFP2NG(bifp) = priv->node;
  413         IF_AFDATA_UNLOCK(bifp);
  414 
  415         /*
  416          * If this is the first interface added to the bundle,
  417          * use its MAC address for the virtual interface (and,
  418          * by extension, all the other ports in the bundle).
  419          */
  420         if (b->fec_ifcnt == 0)
  421                 if_setlladdr(ifp, IF_LLADDR(bifp), ETHER_ADDR_LEN);
  422 
  423         b->fec_btype = FEC_BTYPE_MAC;
  424         new->fec_idx = b->fec_ifcnt;
  425         b->fec_ifcnt++;
  426 
  427         /* Initialise the list of multicast addresses that we own. */
  428         SLIST_INIT(&new->fec_mc_head);
  429 
  430         /* Save the real MAC address. */
  431         bcopy(IF_LLADDR(bifp),
  432             (char *)&new->fec_mac, ETHER_ADDR_LEN);
  433 
  434         /* Set up phony MAC address. */
  435         if_setlladdr(bifp, IF_LLADDR(ifp), ETHER_ADDR_LEN);
  436         EVENTHANDLER_INVOKE(iflladdr_event, bifp);
  437 
  438         /* Save original input vector */
  439         new->fec_if_input = bifp->if_input;
  440 
  441         /* Override it with our own */
  442         bifp->if_input = ng_fec_input;
  443 
  444         /* Save output vector too. */
  445         if (b->fec_if_output == NULL)
  446                 b->fec_if_output = bifp->if_output;
  447 
  448         /* Add to the queue */
  449         new->fec_if = bifp;
  450         new->fec_ifstat = -1;
  451         TAILQ_INSERT_TAIL(&b->ng_fec_ports, new, fec_list);
  452 
  453         /* Add multicast addresses to this port. */
  454         ng_fec_ether_cmdmulti(ifp, new, 1);
  455 
  456         return(0);
  457 }
  458 
  459 static int
  460 ng_fec_delport(struct ng_fec_private *priv, char *iface)
  461 {
  462         struct ng_fec_bundle    *b;
  463         struct ifnet            *ifp, *bifp;
  464         struct ng_fec_portlist  *p;
  465 
  466         if (priv == NULL || iface == NULL)
  467                 return(EINVAL);
  468 
  469         b = &priv->fec_bundle;
  470         ifp = priv->ifp;
  471 
  472         /* Only allow reconfiguration if not running. */
  473         if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
  474                 printf("fec%d: can't remove iface; bundle is running\n",
  475                     priv->unit);
  476                 return (EINVAL);
  477         }
  478 
  479         /* Find the interface */
  480         bifp = ifunit(iface);
  481         if (bifp == NULL) {
  482                 printf("fec%d: tried to remove iface %s, which "
  483                     "doesn't seem to exist\n", priv->unit, iface);
  484                 return(ENOENT);
  485         }
  486 
  487         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  488                 if (p->fec_if == bifp)
  489                         break;
  490         }
  491 
  492         if (p == NULL) {
  493                 printf("fec%d: tried to remove iface %s which "
  494                     "is not in our bundle\n", priv->unit, iface);
  495                 return(EINVAL);
  496         }
  497 
  498         /* Stop interface */
  499         bifp->if_flags &= ~IFF_UP;
  500         (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
  501 
  502         /* Restore MAC address. */
  503         if_setlladdr(bifp, (u_char *)&p->fec_mac, ETHER_ADDR_LEN);
  504 
  505         /* Restore input vector */
  506         bifp->if_input = p->fec_if_input;
  507 
  508         /* Remove our node context pointer. */
  509         IF_AFDATA_LOCK(bifp);
  510         IFP2NG(bifp) = NULL;
  511         IF_AFDATA_UNLOCK(bifp);
  512 
  513         /* Delete port */
  514         TAILQ_REMOVE(&b->ng_fec_ports, p, fec_list);
  515         free(p, M_NETGRAPH);
  516         b->fec_ifcnt--;
  517 
  518         if (b->fec_ifcnt == 0)
  519                 b->fec_if_output = NULL;
  520 
  521         return(0);
  522 }
  523 
  524 static int
  525 ng_fec_ether_cmdmulti(struct ifnet *trifp, struct ng_fec_portlist *p, int set)
  526 {
  527         struct ifnet *ifp = p->fec_if;
  528         struct ng_fec_mc *mc;
  529         struct ifmultiaddr *ifma, *rifma = NULL;
  530         struct sockaddr_dl sdl;
  531         int error;
  532 
  533         bzero((char *)&sdl, sizeof(sdl));
  534         sdl.sdl_len = sizeof(sdl);
  535         sdl.sdl_family = AF_LINK;
  536         sdl.sdl_type = IFT_ETHER;
  537         sdl.sdl_alen = ETHER_ADDR_LEN;
  538         sdl.sdl_index = ifp->if_index;
  539 
  540         if (set) {
  541                 TAILQ_FOREACH(ifma, &trifp->if_multiaddrs, ifma_link) {
  542                         if (ifma->ifma_addr->sa_family != AF_LINK)
  543                                 continue;
  544                         bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
  545                             LLADDR(&sdl), ETHER_ADDR_LEN);
  546 
  547                         error = if_addmulti(ifp, (struct sockaddr *)&sdl, &rifma);
  548                         if (error)
  549                                 return (error);
  550                         mc = malloc(sizeof(struct ng_fec_mc), M_DEVBUF, M_NOWAIT);
  551                         if (mc == NULL)
  552                                 return (ENOMEM);
  553                         mc->mc_ifma = rifma;
  554                         SLIST_INSERT_HEAD(&p->fec_mc_head, mc, mc_entries);
  555                 }
  556         } else {
  557                 while ((mc = SLIST_FIRST(&p->fec_mc_head)) != NULL) {
  558                         SLIST_REMOVE(&p->fec_mc_head, mc, ng_fec_mc, mc_entries);
  559                         if_delmulti_ifma(mc->mc_ifma);
  560                         free(mc, M_DEVBUF);
  561                 }
  562         }
  563         return (0);
  564 }
  565 
  566 static int
  567 ng_fec_ether_setmulti(struct ifnet *ifp)
  568 {
  569         struct ng_fec_private   *priv;
  570         struct ng_fec_bundle    *b;
  571         struct ng_fec_portlist  *p;
  572 
  573         priv = ifp->if_softc;
  574         b = &priv->fec_bundle;
  575 
  576         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  577                 /* First, remove any existing filter entries. */
  578                 ng_fec_ether_cmdmulti(ifp, p, 0);
  579                 /* copy all addresses from the fec interface to the port */
  580                 ng_fec_ether_cmdmulti(ifp, p, 1);
  581         }
  582         return (0);
  583 }
  584 
  585 /*
  586  * Pass an ioctl command down to all the underyling interfaces in a
  587  * bundle. Used for setting flags.
  588  */
  589 
  590 static int 
  591 ng_fec_setport(struct ifnet *ifp, u_long command, caddr_t data)
  592 {
  593         struct ng_fec_private   *priv;
  594         struct ng_fec_bundle    *b;
  595         struct ifnet            *oifp;
  596         struct ng_fec_portlist  *p;
  597 
  598         priv = ifp->if_softc;
  599         b = &priv->fec_bundle;
  600 
  601         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  602                 oifp = p->fec_if;
  603                 if (oifp != NULL)
  604                         (*oifp->if_ioctl)(oifp, command, data);
  605         }
  606 
  607         return(0);
  608 }
  609 
  610 static void
  611 ng_fec_init(void *arg)
  612 {
  613         struct ng_fec_private   *priv;
  614         struct ng_fec_bundle    *b;
  615         struct ifnet            *ifp, *bifp;
  616         struct ng_fec_portlist  *p;
  617 
  618         priv = arg;
  619         ifp = priv->ifp;
  620         b = &priv->fec_bundle;
  621 
  622         if (b->fec_ifcnt != 2 && b->fec_ifcnt != FEC_BUNDLESIZ) {
  623                 printf("fec%d: invalid bundle "
  624                     "size: %d\n", priv->unit,
  625                     b->fec_ifcnt);
  626                 return;
  627         }
  628 
  629         ng_fec_stop(ifp);
  630 
  631         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  632                 bifp = p->fec_if;
  633                 bifp->if_flags |= IFF_UP;
  634                 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
  635                 /* mark iface as up and let the monitor check it */
  636                 p->fec_ifstat = -1;
  637         }
  638 
  639         ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
  640         ifp->if_drv_flags |= IFF_DRV_RUNNING;
  641 
  642         priv->fec_ch = timeout(ng_fec_tick, priv, hz);
  643 
  644         return;
  645 }
  646 
  647 static void
  648 ng_fec_stop(struct ifnet *ifp)
  649 {
  650         struct ng_fec_private   *priv;
  651         struct ng_fec_bundle    *b;
  652         struct ifnet            *bifp;
  653         struct ng_fec_portlist  *p;
  654 
  655         priv = ifp->if_softc;
  656         b = &priv->fec_bundle;
  657 
  658         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  659                 bifp = p->fec_if;
  660                 bifp->if_flags &= ~IFF_UP;
  661                 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
  662         }
  663 
  664         untimeout(ng_fec_tick, priv, priv->fec_ch);
  665 
  666         ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
  667 
  668         return;
  669 }
  670 
  671 static void
  672 ng_fec_tick(void *arg)
  673 {
  674         struct ng_fec_private   *priv;
  675         struct ng_fec_bundle    *b;
  676         struct ifmediareq       ifmr;
  677         struct ifnet            *ifp;
  678         struct ng_fec_portlist  *p;
  679         int                     error = 0;
  680 
  681         priv = arg;
  682         b = &priv->fec_bundle;
  683 
  684         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  685                 bzero((char *)&ifmr, sizeof(ifmr));
  686                 ifp = p->fec_if;
  687                 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr);
  688                 if (error) {
  689                         printf("fec%d: failed to check status "
  690                             "of link %s\n", priv->unit, ifp->if_xname);
  691                         continue;
  692                 }
  693 
  694                 if (ifmr.ifm_status & IFM_AVALID) {
  695                         if (ifmr.ifm_status & IFM_ACTIVE) {
  696                                 if (p->fec_ifstat == -1 ||
  697                                     p->fec_ifstat == 0) {
  698                                         p->fec_ifstat = 1;
  699                                         printf("fec%d: port %s in bundle "
  700                                             "is up\n", priv->unit,
  701                                             ifp->if_xname);
  702                                 }
  703                         } else {
  704                                 if (p->fec_ifstat == -1 ||
  705                                     p->fec_ifstat == 1) {
  706                                         p->fec_ifstat = 0;
  707                                         printf("fec%d: port %s in bundle "
  708                                             "is down\n", priv->unit,
  709                                             ifp->if_xname);
  710                                 }
  711                         }
  712                 }
  713         }
  714 
  715         ifp = priv->ifp;
  716         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
  717                 priv->fec_ch = timeout(ng_fec_tick, priv, hz);
  718 
  719         return;
  720 }
  721 
  722 static int
  723 ng_fec_ifmedia_upd(struct ifnet *ifp)
  724 {
  725         return(0);
  726 }
  727 
  728 static void ng_fec_ifmedia_sts(struct ifnet *ifp,
  729         struct ifmediareq *ifmr)
  730 {
  731         struct ng_fec_private   *priv;
  732         struct ng_fec_bundle    *b;
  733         struct ng_fec_portlist  *p;
  734 
  735         priv = ifp->if_softc;
  736         b = &priv->fec_bundle;
  737 
  738         ifmr->ifm_status = IFM_AVALID;
  739         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  740                 if (p->fec_ifstat == 1) {
  741                         ifmr->ifm_status |= IFM_ACTIVE;
  742                         break;
  743                 }
  744         }
  745 
  746         return;
  747 }
  748 
  749 /*
  750  * Process an ioctl for the virtual interface
  751  */
  752 static int
  753 ng_fec_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
  754 {
  755         struct ifreq *const ifr = (struct ifreq *) data;
  756         int s, error = 0;
  757         struct ng_fec_private   *priv;
  758         struct ng_fec_bundle    *b;
  759 
  760         priv = ifp->if_softc;
  761         b = &priv->fec_bundle;
  762 
  763 #ifdef DEBUG
  764         ng_fec_print_ioctl(ifp, command, data);
  765 #endif
  766         s = splimp();
  767         switch (command) {
  768 
  769         /* These two are mostly handled at a higher layer */
  770         case SIOCSIFADDR:
  771         case SIOCGIFADDR:
  772                 error = ether_ioctl(ifp, command, data);
  773                 break;
  774 
  775         case SIOCSIFMTU:
  776                 if (ifr->ifr_mtu >= NG_FEC_MTU_MIN &&
  777                     ifr->ifr_mtu <= NG_FEC_MTU_MAX) {
  778                         struct ng_fec_portlist *p;
  779                         struct ifnet *bifp;
  780 
  781                         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  782                                 bifp = p->fec_if;
  783                                 error = (*bifp->if_ioctl)(bifp, SIOCSIFMTU,
  784                                     data);
  785                                 if (error != 0)
  786                                         break;
  787                         }
  788                         if (error == 0)
  789                                 ifp->if_mtu = ifr->ifr_mtu;
  790                 } else
  791                         error = EINVAL;
  792                 break;
  793 
  794         /* Set flags */
  795         case SIOCSIFFLAGS:
  796                 /*
  797                  * If the interface is marked up and stopped, then start it.
  798                  * If it is marked down and running, then stop it.
  799                  */
  800                 if (ifr->ifr_flags & IFF_UP) {
  801                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  802                                 /* Sanity. */
  803                                 if (b->fec_ifcnt != 2 &&
  804                                     b->fec_ifcnt != FEC_BUNDLESIZ) {
  805                                         printf("fec%d: invalid bundle "
  806                                             "size: %d\n", priv->unit,
  807                                             b->fec_ifcnt);
  808                                         error = EINVAL;
  809                                         break;
  810                                 }
  811                                 ng_fec_init(priv);
  812                         }
  813                         /*
  814                          * Bubble down changes in promisc mode to
  815                          * underlying interfaces.
  816                          */
  817                         if ((ifp->if_flags & IFF_PROMISC) !=
  818                             (priv->if_flags & IFF_PROMISC)) {
  819                                 ng_fec_setport(ifp, command, data);
  820                                 priv->if_flags = ifp->if_flags;
  821                         }
  822                 } else {
  823                         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
  824                                 ng_fec_stop(ifp);
  825                 }
  826                 break;
  827 
  828         case SIOCADDMULTI:
  829         case SIOCDELMULTI:
  830                 ng_fec_ether_setmulti(ifp);
  831                 error = 0;
  832                 break;
  833         case SIOCGIFMEDIA:
  834         case SIOCSIFMEDIA:
  835                 error = ifmedia_ioctl(ifp, ifr, &priv->ifmedia, command);
  836                 break;
  837         /* Stuff that's not supported */
  838         case SIOCSIFPHYS:
  839                 error = EOPNOTSUPP;
  840                 break;
  841 
  842         default:
  843                 error = EINVAL;
  844                 break;
  845         }
  846         (void) splx(s);
  847         return (error);
  848 }
  849 
  850 /*
  851  * This routine spies on mbufs received by underlying network device
  852  * drivers. When we add an interface to our bundle, we override its
  853  * if_input routine with a pointer to ng_fec_input(). This means we
  854  * get to look at all the device's packets before sending them to the
  855  * real ether_input() for processing by the stack. Once we verify the
  856  * packet comes from an interface that's been aggregated into
  857  * our bundle, we fix up the rcvif pointer and increment our
  858  * packet counters so that it looks like the frames are actually
  859  * coming from us.
  860  */
  861 static void 
  862 ng_fec_input(struct ifnet *ifp, struct mbuf *m0)
  863 {
  864         struct ng_node          *node;
  865         struct ng_fec_private   *priv;
  866         struct ng_fec_bundle    *b;
  867         struct ifnet            *bifp;
  868         struct ng_fec_portlist  *p;
  869 
  870         /* Sanity check */
  871         if (ifp == NULL || m0 == NULL)
  872                 return;
  873 
  874         node = IFP2NG(ifp);
  875 
  876         /* Sanity check part II */
  877         if (node == NULL)
  878                 return;
  879 
  880         priv = NG_NODE_PRIVATE(node);
  881         b = &priv->fec_bundle;
  882         bifp = priv->ifp;
  883 
  884         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  885                 if (p->fec_if == m0->m_pkthdr.rcvif)
  886                         break;
  887         }
  888 
  889         /* Wasn't meant for us; leave this frame alone. */
  890         if (p == NULL)
  891                 return;
  892 
  893         /*
  894          * Check for a BPF tap on the underlying interface. This
  895          * is mainly a debugging aid: it allows tcpdump-ing of an
  896          * individual interface in a bundle to work, which it
  897          * otherwise would not. BPF tapping of our own aggregate
  898          * interface will occur once we call ether_input().
  899          */
  900         BPF_MTAP(m0->m_pkthdr.rcvif, m0);
  901 
  902         /* Convince the system that this is our frame. */
  903         m0->m_pkthdr.rcvif = bifp;
  904 
  905         /*
  906          * Count bytes on an individual interface in a bundle.
  907          * The bytes will also be added to the aggregate interface
  908          * once we call ether_input().
  909          */
  910         ifp->if_ibytes += m0->m_pkthdr.len;
  911 
  912         bifp->if_ipackets++;
  913         (*bifp->if_input)(bifp, m0);
  914 
  915         return;
  916 }
  917 
  918 /*
  919  * Take a quick peek at the packet and see if it's ok for us to use
  920  * the inet or inet6 hash methods on it, if they're enabled. We do
  921  * this by setting flags in the mbuf header. Once we've made up our
  922  * mind what to do, we pass the frame to output vector for further
  923  * processing.
  924  */
  925 
  926 static int
  927 ng_fec_output(struct ifnet *ifp, struct mbuf *m,
  928                 struct sockaddr *dst, struct route *ro)
  929 {
  930         const priv_p priv = (priv_p) ifp->if_softc;
  931         struct ng_fec_bundle *b;
  932         int error;
  933 
  934         /* Check interface flags */
  935         if (!((ifp->if_flags & IFF_UP) &&
  936             (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
  937                 m_freem(m);
  938                 return (ENETDOWN);
  939         }
  940 
  941         b = &priv->fec_bundle;
  942 
  943         switch (b->fec_btype) {
  944         case FEC_BTYPE_MAC:
  945                 m->m_flags |= M_FEC_MAC;
  946                 break;
  947 #ifdef INET
  948         case FEC_BTYPE_INET:
  949                 /*
  950                  * We can't use the INET address port selection
  951                  * scheme if this isn't an INET packet.
  952                  */
  953                 if (dst->sa_family == AF_INET)
  954                         m->m_flags |= M_FEC_INET;
  955 #ifdef INET6
  956                 else if (dst->sa_family == AF_INET6)
  957                         m->m_flags |= M_FEC_INET6;
  958 #endif
  959                 else {
  960 #ifdef DEBUG
  961                         if_printf(ifp, "can't do inet aggregation of non "
  962                             "inet packet\n");
  963 #endif
  964                         m->m_flags |= M_FEC_MAC;
  965                 }
  966                 break;
  967 #endif
  968         default:
  969                 if_printf(ifp, "bogus hash type: %d\n",
  970                     b->fec_btype);
  971                 m_freem(m);
  972                 return(EINVAL);
  973                 break;
  974         }
  975 
  976         /*
  977          * Pass the frame to the output vector for all the protocol
  978          * handling. This will put the ethernet header on the packet
  979          * for us.
  980          */
  981         priv->if_error = 0;
  982         error = (*b->fec_if_output)(ifp, m, dst, ro);
  983         if (priv->if_error && !error)
  984                 error = priv->if_error;
  985 
  986         return(error);
  987 }
  988 
  989 /*
  990  * Apply a hash to the source and destination addresses in the packet
  991  * in order to select an interface. Also check link status and handle
  992  * dead links accordingly.
  993  */
  994 
  995 static int
  996 ng_fec_choose_port(struct ng_fec_bundle *b,
  997         struct mbuf *m, struct ifnet **ifp)
  998 {
  999         struct ether_header     *eh;
 1000         struct mbuf             *m0;
 1001 #ifdef INET
 1002         struct ip               *ip;
 1003 #ifdef INET6
 1004         struct ip6_hdr          *ip6;
 1005 #endif
 1006 #endif
 1007 
 1008         struct ng_fec_portlist  *p;
 1009         int                     port = 0, mask;
 1010 
 1011         /*
 1012          * If there are only two ports, mask off all but the
 1013          * last bit for XORing. If there are 4, mask off all
 1014          * but the last 2 bits.
 1015          */
 1016         mask = b->fec_ifcnt == 2 ? 0x1 : 0x3;
 1017         eh = mtod(m, struct ether_header *);
 1018 #ifdef INET
 1019         ip = (struct ip *)(mtod(m, char *) +
 1020             sizeof(struct ether_header));
 1021 #ifdef INET6
 1022         ip6 = (struct ip6_hdr *)(mtod(m, char *) +
 1023             sizeof(struct ether_header));
 1024 #endif
 1025 #endif
 1026 
 1027         /*
 1028          * The fg_fec_output() routine is supposed to leave a
 1029          * flag for us in the mbuf that tells us what hash to
 1030          * use, but sometimes a new mbuf is prepended to the
 1031          * chain, so we have to search every mbuf in the chain
 1032          * to find the flags.
 1033          */
 1034         m0 = m;
 1035         while (m0) {
 1036                 if (m0->m_flags & (M_FEC_MAC|M_FEC_INET|M_FEC_INET6))
 1037                         break;
 1038                 m0 = m0->m_next;
 1039         }
 1040         if (m0 == NULL)
 1041                 return(EINVAL);
 1042 
 1043         switch (m0->m_flags & (M_FEC_MAC|M_FEC_INET|M_FEC_INET6)) {
 1044         case M_FEC_MAC:
 1045                 port = (eh->ether_dhost[5] ^
 1046                     eh->ether_shost[5]) & mask;
 1047                 break;
 1048 #ifdef INET
 1049         case M_FEC_INET:
 1050                 port = (ntohl(ip->ip_dst.s_addr) ^
 1051                     ntohl(ip->ip_src.s_addr)) & mask;
 1052                 break;
 1053 #ifdef INET6
 1054         case M_FEC_INET6:
 1055                 port = (ip6->ip6_dst.s6_addr[15] ^
 1056                     ip6->ip6_dst.s6_addr[15]) & mask;
 1057                 break;
 1058 #endif
 1059 #endif
 1060         default:
 1061                 return(EINVAL);
 1062                         break;
 1063         }
 1064 
 1065         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
 1066                 if (port == p->fec_idx)
 1067                         break;
 1068         }
 1069 
 1070         /*
 1071          * Now that we've chosen a port, make sure it's
 1072          * alive. If it's not alive, cycle through the bundle
 1073          * looking for a port that is alive. If we don't find
 1074          * any, return an error.
 1075          */
 1076         if (p->fec_ifstat != 1) {
 1077                 struct ng_fec_portlist  *n = NULL;
 1078 
 1079                 n = TAILQ_NEXT(p, fec_list);
 1080                 if (n == NULL)
 1081                         n = TAILQ_FIRST(&b->ng_fec_ports);
 1082                 while (n != p) {
 1083                         if (n->fec_ifstat == 1)
 1084                                 break;
 1085                         n = TAILQ_NEXT(n, fec_list);
 1086                         if (n == NULL)
 1087                                 n = TAILQ_FIRST(&b->ng_fec_ports);
 1088                 }
 1089                 if (n == p)
 1090                         return(EAGAIN);
 1091                 p = n;
 1092         }
 1093 
 1094         *ifp = p->fec_if;
 1095 
 1096         return(0);
 1097 }
 1098 
 1099 /*
 1100  * Now that the packet has been run through ether_output(), yank it
 1101  * off our own send queue and stick it on the queue for the appropriate
 1102  * underlying physical interface. Note that if the interface's send
 1103  * queue is full, we save an error status in our private netgraph
 1104  * space which will eventually be handed up to ng_fec_output(), which
 1105  * will return it to the rest of the IP stack. We need to do this
 1106  * in order to duplicate the effect of ether_output() returning ENOBUFS
 1107  * when it detects that an interface's send queue is full. There's no
 1108  * other way to signal the error status from here since the if_start()
 1109  * routine is spec'ed to return void.
 1110  *
 1111  * Once the frame is queued, we call ether_output_frame() to initiate
 1112  * transmission.
 1113  */
 1114 static void
 1115 ng_fec_start(struct ifnet *ifp)
 1116 {
 1117         struct ng_fec_private   *priv;
 1118         struct ng_fec_bundle    *b;
 1119         struct ifnet            *oifp = NULL;
 1120         struct mbuf             *m0;
 1121         int                     error;
 1122 
 1123         priv = ifp->if_softc;
 1124         b = &priv->fec_bundle;
 1125 
 1126         IF_DEQUEUE(&ifp->if_snd, m0);
 1127         if (m0 == NULL)
 1128                 return;
 1129 
 1130         BPF_MTAP(ifp, m0);
 1131 
 1132         /* Queue up packet on the proper port. */
 1133         error = ng_fec_choose_port(b, m0, &oifp);
 1134         if (error) {
 1135                 ifp->if_ierrors++;
 1136                 m_freem(m0);
 1137                 priv->if_error = ENOBUFS;
 1138                 return;
 1139         }
 1140         ifp->if_opackets++;
 1141 
 1142         priv->if_error = IF_HANDOFF(&oifp->if_snd, m0, oifp) ? 0 : ENOBUFS;
 1143 
 1144         return;
 1145 }
 1146 
 1147 #ifdef DEBUG
 1148 /*
 1149  * Display an ioctl to the virtual interface
 1150  */
 1151 
 1152 static void
 1153 ng_fec_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
 1154 {
 1155         char   *str;
 1156 
 1157         switch (command & IOC_DIRMASK) {
 1158         case IOC_VOID:
 1159                 str = "IO";
 1160                 break;
 1161         case IOC_OUT:
 1162                 str = "IOR";
 1163                 break;
 1164         case IOC_IN:
 1165                 str = "IOW";
 1166                 break;
 1167         case IOC_INOUT:
 1168                 str = "IORW";
 1169                 break;
 1170         default:
 1171                 str = "IO??";
 1172         }
 1173         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
 1174                ifp->if_xname,
 1175                str,
 1176                IOCGROUP(command),
 1177                command & 0xff,
 1178                IOCPARM_LEN(command));
 1179 }
 1180 #endif /* DEBUG */
 1181 
 1182 /************************************************************************
 1183                         NETGRAPH NODE STUFF
 1184  ************************************************************************/
 1185 
 1186 /*
 1187  * Constructor for a node
 1188  */
 1189 static int
 1190 ng_fec_constructor(node_p node)
 1191 {
 1192         char ifname[NG_FEC_FEC_NAME_MAX + 1];
 1193         struct ifnet *ifp;
 1194         priv_p priv;
 1195         const uint8_t eaddr[ETHER_ADDR_LEN] = {0, 0, 0, 0, 0, 0};
 1196         struct ng_fec_bundle *b;
 1197         int error = 0;
 1198 
 1199         /* Allocate node and interface private structures */
 1200         priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
 1201         if (priv == NULL)
 1202                 return (ENOMEM);
 1203 
 1204         ifp = priv->ifp = if_alloc(IFT_ETHER);
 1205         if (ifp == NULL) {
 1206                 free(priv, M_NETGRAPH);
 1207                 return (ENOSPC);
 1208         }
 1209         b = &priv->fec_bundle;
 1210 
 1211         /* Link them together */
 1212         ifp->if_softc = priv;
 1213 
 1214         /* Get an interface unit number */
 1215         if ((error = ng_fec_get_unit(&priv->unit)) != 0) {
 1216                 if_free(ifp);
 1217                 free(priv, M_NETGRAPH);
 1218                 return (error);
 1219         }
 1220 
 1221         /* Link together node and private info */
 1222         NG_NODE_SET_PRIVATE(node, priv);
 1223         priv->node = node;
 1224 
 1225         /* Initialize interface structure */
 1226         if_initname(ifp, NG_FEC_FEC_NAME, priv->unit);
 1227         ifp->if_start = ng_fec_start;
 1228         ifp->if_ioctl = ng_fec_ioctl;
 1229         ifp->if_init = ng_fec_init;
 1230         ifp->if_snd.ifq_maxlen = ifqmaxlen;
 1231         ifp->if_mtu = NG_FEC_MTU_DEFAULT;
 1232         ifp->if_flags = (IFF_SIMPLEX|IFF_BROADCAST|IFF_MULTICAST);
 1233         ifp->if_addrlen = 0;                    /* XXX */
 1234         ifp->if_hdrlen = 0;                     /* XXX */
 1235         ifp->if_baudrate = 100000000;           /* XXX */
 1236         TAILQ_INIT(&ifp->if_addrhead); /* XXX useless - done in if_attach */
 1237 
 1238         /* Give this node the same name as the interface (if possible) */
 1239         bzero(ifname, sizeof(ifname));
 1240         strlcpy(ifname, ifp->if_xname, sizeof(ifname));
 1241         if (ng_name_node(node, ifname) != 0)
 1242                 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname);
 1243 
 1244         /* Attach the interface */
 1245         ether_ifattach(ifp, eaddr);
 1246         callout_handle_init(&priv->fec_ch);
 1247 
 1248         /* Override output method with our own */
 1249         ifp->if_output = ng_fec_output;
 1250 
 1251         TAILQ_INIT(&b->ng_fec_ports);
 1252         b->fec_ifcnt = 0;
 1253 
 1254         ifmedia_init(&priv->ifmedia, 0,
 1255             ng_fec_ifmedia_upd, ng_fec_ifmedia_sts);
 1256         ifmedia_add(&priv->ifmedia, IFM_ETHER|IFM_NONE, 0, NULL);
 1257         ifmedia_set(&priv->ifmedia, IFM_ETHER|IFM_NONE);
 1258 
 1259         /* Done */
 1260         return (0);
 1261 }
 1262 
 1263 /*
 1264  * Receive a control message
 1265  */
 1266 static int
 1267 ng_fec_rcvmsg(node_p node, item_p item, hook_p lasthook)
 1268 {
 1269         const priv_p priv = NG_NODE_PRIVATE(node);
 1270         struct ng_fec_bundle    *b;
 1271         struct ng_mesg *resp = NULL;
 1272         struct ng_mesg *msg;
 1273         char *ifname;
 1274         int error = 0;
 1275 
 1276         NGI_GET_MSG(item, msg);
 1277         b = &priv->fec_bundle;
 1278 
 1279         switch (msg->header.typecookie) {
 1280         case NGM_FEC_COOKIE:
 1281                 switch (msg->header.cmd) {
 1282                 case NGM_FEC_ADD_IFACE:
 1283                         ifname = msg->data;
 1284                         error = ng_fec_addport(priv, ifname);
 1285                         break;
 1286                 case NGM_FEC_DEL_IFACE:
 1287                         ifname = msg->data;
 1288                         error = ng_fec_delport(priv, ifname);
 1289                         break;
 1290                 case NGM_FEC_SET_MODE_MAC:
 1291                         b->fec_btype = FEC_BTYPE_MAC;
 1292                         break;
 1293 #ifdef INET
 1294                 case NGM_FEC_SET_MODE_INET:
 1295                         b->fec_btype = FEC_BTYPE_INET;
 1296                         break;
 1297 #ifdef INET6
 1298                 case NGM_FEC_SET_MODE_INET6:
 1299                         b->fec_btype = FEC_BTYPE_INET6;
 1300                         break;
 1301 #endif
 1302 #endif
 1303                 default:
 1304                         error = EINVAL;
 1305                         break;
 1306                 }
 1307                 break;
 1308         default:
 1309                 error = EINVAL;
 1310                 break;
 1311         }
 1312         NG_RESPOND_MSG(error, node, item, resp);
 1313         NG_FREE_MSG(msg);
 1314         return (error);
 1315 }
 1316 
 1317 /*
 1318  * Shutdown and remove the node and its associated interface.
 1319  */
 1320 static int
 1321 ng_fec_shutdown(node_p node)
 1322 {
 1323         const priv_p priv = NG_NODE_PRIVATE(node);
 1324         struct ng_fec_bundle *b;
 1325         struct ng_fec_portlist  *p;
 1326 
 1327         b = &priv->fec_bundle;
 1328         ng_fec_stop(priv->ifp);
 1329 
 1330         while (!TAILQ_EMPTY(&b->ng_fec_ports)) {
 1331                 p = TAILQ_FIRST(&b->ng_fec_ports);
 1332                 ng_fec_ether_cmdmulti(priv->ifp, p, 0);
 1333                 ng_fec_delport(priv, p->fec_if->if_xname);
 1334         }
 1335 
 1336         ether_ifdetach(priv->ifp);
 1337         if_free_type(priv->ifp, IFT_ETHER);
 1338         ifmedia_removeall(&priv->ifmedia);
 1339         ng_fec_free_unit(priv->unit);
 1340         free(priv, M_NETGRAPH);
 1341         NG_NODE_SET_PRIVATE(node, NULL);
 1342         NG_NODE_UNREF(node);
 1343         return (0);
 1344 }
 1345 
 1346 /*
 1347  * Handle loading and unloading for this node type.
 1348  */
 1349 static int
 1350 ng_fec_mod_event(module_t mod, int event, void *data)
 1351 {
 1352         int error = 0;
 1353 
 1354         switch (event) {
 1355         case MOD_LOAD:
 1356                 mtx_init(&ng_fec_mtx, "ng_fec", NULL, MTX_DEF);
 1357                 break;
 1358         case MOD_UNLOAD:
 1359                 mtx_destroy(&ng_fec_mtx);
 1360                 break;
 1361         default:
 1362                 error = EOPNOTSUPP;
 1363                 break;
 1364         }
 1365         return (error);
 1366 }

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