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  * 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/5.3/sys/netgraph/ng_fec.c 136588 2004-10-16 08:43:07Z cvs2svn $
   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 /*
  129  * We need a way to stash a pointer to our netgraph node in the
  130  * ifnet structure so that receive handling works. As far as I can
  131  * tell, although there is an AF_NETGRAPH address family, it's only
  132  * used to identify sockaddr_ng structures: there is no netgraph address
  133  * family domain. This means the AF_NETGRAPH entry in ifp->if_afdata
  134  * should be unused, so we can use to hold our node context.
  135  */
  136 #define IFP2NG(ifp)  (struct ng_node *)(ifp->if_afdata[AF_NETGRAPH])
  137 #define IFP2NG_SET(ifp, val)  ifp->if_afdata[AF_NETGRAPH] = (val);
  138 #define FEC_INC(x, y)   (x) = (x + 1) % y
  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         TAILQ_ENTRY(ng_fec_portlist) fec_list;
  154 };
  155 
  156 struct ng_fec_bundle {
  157         TAILQ_HEAD(,ng_fec_portlist) ng_fec_ports;
  158         int                     fec_ifcnt;
  159         int                     fec_btype;
  160         int                     (*fec_if_output) (struct ifnet *,
  161                                                   struct mbuf *,
  162                                                   struct sockaddr *,
  163                                                   struct rtentry *);
  164 };
  165 
  166 #define FEC_BTYPE_MAC           0x01
  167 #define FEC_BTYPE_INET          0x02
  168 #define FEC_BTYPE_INET6         0x03
  169 
  170 /* Node private data */
  171 struct ng_fec_private {
  172         struct arpcom arpcom;
  173         struct ifmedia ifmedia;
  174         int     if_flags;
  175         int     if_error;               /* XXX */
  176         int     unit;                   /* Interface unit number */
  177         node_p  node;                   /* Our netgraph node */
  178         struct ng_fec_bundle fec_bundle;/* Aggregate bundle */
  179         struct callout_handle fec_ch;   /* callout handle for ticker */
  180 };
  181 typedef struct ng_fec_private *priv_p;
  182 
  183 /* Interface methods */
  184 static void     ng_fec_input(struct ifnet *, struct mbuf *);
  185 static void     ng_fec_start(struct ifnet *ifp);
  186 static int      ng_fec_choose_port(struct ng_fec_bundle *b,
  187                         struct mbuf *m, struct ifnet **ifp);
  188 static int      ng_fec_setport(struct ifnet *ifp, u_long cmd, caddr_t data);
  189 static void     ng_fec_init(void *arg);
  190 static void     ng_fec_stop(struct ifnet *ifp);
  191 static int      ng_fec_ifmedia_upd(struct ifnet *ifp);
  192 static void     ng_fec_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr);
  193 static int      ng_fec_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
  194 static int      ng_fec_output(struct ifnet *ifp, struct mbuf *m0,
  195                         struct sockaddr *dst, struct rtentry *rt0);
  196 static void     ng_fec_tick(void *arg);
  197 static int      ng_fec_addport(struct ng_fec_private *priv, char *iface);
  198 static int      ng_fec_delport(struct ng_fec_private *priv, char *iface);
  199 
  200 #ifdef DEBUG
  201 static void     ng_fec_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
  202 #endif
  203 
  204 /* Netgraph methods */
  205 static ng_constructor_t ng_fec_constructor;
  206 static ng_rcvmsg_t      ng_fec_rcvmsg;
  207 static ng_shutdown_t    ng_fec_shutdown;
  208 
  209 /* List of commands and how to convert arguments to/from ASCII */
  210 static const struct ng_cmdlist ng_fec_cmds[] = {
  211         {
  212           NGM_FEC_COOKIE,
  213           NGM_FEC_ADD_IFACE,
  214           "add_iface",
  215           &ng_parse_string_type,
  216           NULL,
  217         },
  218         {
  219           NGM_FEC_COOKIE,
  220           NGM_FEC_DEL_IFACE,
  221           "del_iface",
  222           &ng_parse_string_type,
  223           NULL,
  224         },
  225         {
  226           NGM_FEC_COOKIE,
  227           NGM_FEC_SET_MODE_MAC,
  228           "set_mode_mac",
  229           NULL,
  230           NULL,
  231         },
  232         {
  233           NGM_FEC_COOKIE,
  234           NGM_FEC_SET_MODE_INET,
  235           "set_mode_inet",
  236           NULL,
  237           NULL,
  238         },
  239         { 0 }
  240 };
  241 
  242 /* Node type descriptor */
  243 static struct ng_type typestruct = {
  244         .version =      NG_ABI_VERSION,
  245         .name =         NG_FEC_NODE_TYPE,
  246         .constructor =  ng_fec_constructor,
  247         .rcvmsg =       ng_fec_rcvmsg,
  248         .shutdown =     ng_fec_shutdown,
  249         .cmdlist =      ng_fec_cmds,
  250 };
  251 NETGRAPH_INIT(fec, &typestruct);
  252 
  253 /* We keep a bitmap indicating which unit numbers are free.
  254    One means the unit number is free, zero means it's taken. */
  255 static int      *ng_fec_units = NULL;
  256 static int      ng_fec_units_len = 0;
  257 static int      ng_units_in_use = 0;
  258 
  259 #define UNITS_BITSPERWORD       (sizeof(*ng_fec_units) * NBBY)
  260 
  261 static struct mtx       ng_fec_mtx;
  262 MTX_SYSINIT(ng_fec, &ng_fec_mtx, "ng_fec", MTX_DEF);
  263 
  264 /*
  265  * Find the first free unit number for a new interface.
  266  * Increase the size of the unit bitmap as necessary.
  267  */
  268 static __inline int
  269 ng_fec_get_unit(int *unit)
  270 {
  271         int index, bit;
  272 
  273         mtx_lock(&ng_fec_mtx);
  274         for (index = 0; index < ng_fec_units_len
  275             && ng_fec_units[index] == 0; index++);
  276         if (index == ng_fec_units_len) {                /* extend array */
  277                 int i, *newarray, newlen;
  278 
  279                 newlen = (2 * ng_fec_units_len) + 4;
  280                 MALLOC(newarray, int *, newlen * sizeof(*ng_fec_units),
  281                     M_NETGRAPH, M_NOWAIT);
  282                 if (newarray == NULL) {
  283                         mtx_unlock(&ng_fec_mtx);
  284                         return (ENOMEM);
  285                 }
  286                 bcopy(ng_fec_units, newarray,
  287                     ng_fec_units_len * sizeof(*ng_fec_units));
  288                 for (i = ng_fec_units_len; i < newlen; i++)
  289                         newarray[i] = ~0;
  290                 if (ng_fec_units != NULL)
  291                         FREE(ng_fec_units, M_NETGRAPH);
  292                 ng_fec_units = newarray;
  293                 ng_fec_units_len = newlen;
  294         }
  295         bit = ffs(ng_fec_units[index]) - 1;
  296         KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1,
  297             ("%s: word=%d bit=%d", __FUNCTION__, ng_fec_units[index], bit));
  298         ng_fec_units[index] &= ~(1 << bit);
  299         *unit = (index * UNITS_BITSPERWORD) + bit;
  300         ng_units_in_use++;
  301         mtx_unlock(&ng_fec_mtx);
  302         return (0);
  303 }
  304 
  305 /*
  306  * Free a no longer needed unit number.
  307  */
  308 static __inline void
  309 ng_fec_free_unit(int unit)
  310 {
  311         int index, bit;
  312 
  313         index = unit / UNITS_BITSPERWORD;
  314         bit = unit % UNITS_BITSPERWORD;
  315         mtx_lock(&ng_fec_mtx);
  316         KASSERT(index < ng_fec_units_len,
  317             ("%s: unit=%d len=%d", __FUNCTION__, unit, ng_fec_units_len));
  318         KASSERT((ng_fec_units[index] & (1 << bit)) == 0,
  319             ("%s: unit=%d is free", __FUNCTION__, unit));
  320         ng_fec_units[index] |= (1 << bit);
  321         /*
  322          * XXX We could think about reducing the size of ng_fec_units[]
  323          * XXX here if the last portion is all ones
  324          * XXX At least free it if no more units
  325          * Needed if we are to eventually be able to unload.
  326          */
  327         ng_units_in_use--;
  328         if (ng_units_in_use == 0) { /* XXX make SMP safe */
  329                 FREE(ng_fec_units, M_NETGRAPH);
  330                 ng_fec_units_len = 0;
  331                 ng_fec_units = NULL;
  332         }
  333         mtx_unlock(&ng_fec_mtx);
  334 }
  335 
  336 /************************************************************************
  337                         INTERFACE STUFF
  338  ************************************************************************/
  339 
  340 static int
  341 ng_fec_addport(struct ng_fec_private *priv, char *iface)
  342 {
  343         struct ng_fec_bundle    *b;
  344         struct ifnet            *ifp, *bifp;
  345         struct arpcom           *ac;
  346         struct ifaddr           *ifa;
  347         struct sockaddr_dl      *sdl;
  348         struct ng_fec_portlist  *p, *new;
  349 
  350         if (priv == NULL || iface == NULL)
  351                 return(EINVAL);
  352 
  353         b = &priv->fec_bundle;
  354         ifp = &priv->arpcom.ac_if;
  355 
  356         /* Find the interface */
  357         bifp = ifunit(iface);
  358         if (bifp == NULL) {
  359                 printf("fec%d: tried to add iface %s, which "
  360                     "doesn't seem to exist\n", priv->unit, iface);
  361                 return(ENOENT);
  362         }
  363 
  364         /* See if we have room in the bundle */
  365         if (b->fec_ifcnt == FEC_BUNDLESIZ) {
  366                 printf("fec%d: can't add new iface; bundle is full\n",
  367                     priv->unit);
  368                 return(ENOSPC);
  369         }
  370 
  371         /* See if the interface is already in the bundle */
  372         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  373                 if (p->fec_if == bifp) {
  374                         printf("fec%d: iface %s is already in this "
  375                             "bundle\n", priv->unit, iface);
  376                         return(EINVAL);
  377                 }
  378         }
  379 
  380         /*
  381          * All interfaces must use the same output vector. Once the
  382          * user attaches an interface of one type, make all subsequent
  383          * interfaces have the same output vector.
  384          */
  385         if (b->fec_if_output != NULL) {
  386                 if (b->fec_if_output != bifp->if_output) {
  387                         printf("fec%d: iface %s is not the same type "
  388                             "as the other interface(s) already in "
  389                             "the bundle\n", priv->unit, iface);
  390                         return(EINVAL);
  391                 }
  392         }
  393 
  394         /* Allocate new list entry. */
  395         MALLOC(new, struct ng_fec_portlist *,
  396             sizeof(struct ng_fec_portlist), M_NETGRAPH, M_NOWAIT);
  397         if (new == NULL)
  398                 return(ENOMEM);
  399 
  400         ac = (struct arpcom *)bifp;
  401 
  402         IF_AFDATA_LOCK(bifp);
  403         bifp->if_afdata[AF_NETGRAPH] = priv->node;
  404         IF_AFDATA_UNLOCK(bifp);
  405 
  406         /*
  407          * If this is the first interface added to the bundle,
  408          * use its MAC address for the virtual interface (and,
  409          * by extension, all the other ports in the bundle).
  410          */
  411         if (b->fec_ifcnt == 0) {
  412                 ifa = ifaddr_byindex(ifp->if_index);
  413                 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  414                 bcopy((char *)ac->ac_enaddr,
  415                     priv->arpcom.ac_enaddr, ETHER_ADDR_LEN);
  416                 bcopy((char *)ac->ac_enaddr,
  417                     LLADDR(sdl), ETHER_ADDR_LEN);
  418         }
  419 
  420         b->fec_btype = FEC_BTYPE_MAC;
  421         new->fec_idx = b->fec_ifcnt;
  422         b->fec_ifcnt++;
  423 
  424         /* Save the real MAC address. */
  425         bcopy((char *)ac->ac_enaddr,
  426             (char *)&new->fec_mac, ETHER_ADDR_LEN);
  427 
  428         /* Set up phony MAC address. */
  429         ifa = ifaddr_byindex(bifp->if_index);
  430         sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  431         bcopy(priv->arpcom.ac_enaddr, ac->ac_enaddr, ETHER_ADDR_LEN);
  432         bcopy(priv->arpcom.ac_enaddr, LLADDR(sdl), ETHER_ADDR_LEN);
  433 
  434         /* Save original input vector */
  435         new->fec_if_input = bifp->if_input;
  436 
  437         /* Override it with our own */
  438         bifp->if_input = ng_fec_input;
  439 
  440         /* Save output vector too. */
  441         if (b->fec_if_output == NULL)
  442                 b->fec_if_output = bifp->if_output;
  443 
  444         /* Add to the queue */
  445         new->fec_if = bifp;
  446         TAILQ_INSERT_TAIL(&b->ng_fec_ports, new, fec_list);
  447 
  448         return(0);
  449 }
  450 
  451 static int
  452 ng_fec_delport(struct ng_fec_private *priv, char *iface)
  453 {
  454         struct ng_fec_bundle    *b;
  455         struct ifnet            *ifp, *bifp;
  456         struct arpcom           *ac;
  457         struct ifaddr           *ifa;
  458         struct sockaddr_dl      *sdl;
  459         struct ng_fec_portlist  *p;
  460 
  461         if (priv == NULL || iface == NULL)
  462                 return(EINVAL);
  463 
  464         b = &priv->fec_bundle;
  465         ifp = &priv->arpcom.ac_if;
  466 
  467         /* Find the interface */
  468         bifp = ifunit(iface);
  469         if (bifp == NULL) {
  470                 printf("fec%d: tried to remove iface %s, which "
  471                     "doesn't seem to exist\n", priv->unit, iface);
  472                 return(ENOENT);
  473         }
  474 
  475         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  476                 if (p->fec_if == bifp)
  477                         break;
  478         }
  479 
  480         if (p == NULL) {
  481                 printf("fec%d: tried to remove iface %s which "
  482                     "is not in our bundle\n", priv->unit, iface);
  483                 return(EINVAL);
  484         }
  485 
  486         /* Stop interface */
  487         bifp->if_flags &= ~IFF_UP;
  488         (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
  489 
  490         /* Restore MAC address. */
  491         ac = (struct arpcom *)bifp;
  492         ifa = ifaddr_byindex(bifp->if_index);
  493         sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  494         bcopy((char *)&p->fec_mac, ac->ac_enaddr, ETHER_ADDR_LEN);
  495         bcopy((char *)&p->fec_mac, LLADDR(sdl), ETHER_ADDR_LEN);
  496 
  497         /* Restore input vector */
  498         bifp->if_input = p->fec_if_input;
  499 
  500         /* Remove our node context pointer. */
  501         IF_AFDATA_LOCK(bifp);
  502         bifp->if_afdata[AF_NETGRAPH] = NULL;
  503         IF_AFDATA_UNLOCK(bifp);
  504 
  505         /* Delete port */
  506         TAILQ_REMOVE(&b->ng_fec_ports, p, fec_list);
  507         FREE(p, M_NETGRAPH);
  508         b->fec_ifcnt--;
  509 
  510         if (b->fec_ifcnt == 0)
  511                 b->fec_if_output = NULL;
  512 
  513         return(0);
  514 }
  515 
  516 /*
  517  * Pass an ioctl command down to all the underyling interfaces in a
  518  * bundle. Used for setting multicast filters and flags.
  519  */
  520 
  521 static int 
  522 ng_fec_setport(struct ifnet *ifp, u_long command, caddr_t data)
  523 {
  524         struct ng_fec_private   *priv;
  525         struct ng_fec_bundle    *b;
  526         struct ifnet            *oifp;
  527         struct ng_fec_portlist  *p;
  528 
  529         priv = ifp->if_softc;
  530         b = &priv->fec_bundle;
  531 
  532         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  533                 oifp = p->fec_if;
  534                 if (oifp != NULL)
  535                         (*oifp->if_ioctl)(oifp, command, data);
  536         }
  537 
  538         return(0);
  539 }
  540 
  541 static void
  542 ng_fec_init(void *arg)
  543 {
  544         struct ng_fec_private   *priv;
  545         struct ng_fec_bundle    *b;
  546         struct ifnet            *ifp, *bifp;
  547         struct ng_fec_portlist  *p;
  548 
  549         ifp = arg;
  550         priv = ifp->if_softc;
  551         b = &priv->fec_bundle;
  552 
  553         if (b->fec_ifcnt == 1 || b->fec_ifcnt == 3) {
  554                 printf("fec%d: invalid bundle "
  555                     "size: %d\n", priv->unit,
  556                     b->fec_ifcnt);
  557                 return;
  558         }
  559 
  560         ng_fec_stop(ifp);
  561 
  562         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  563                 bifp = p->fec_if;
  564                 bifp->if_flags |= IFF_UP;
  565                 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
  566                 /* mark iface as up and let the monitor check it */
  567                 p->fec_ifstat = -1;
  568         }
  569 
  570         priv->fec_ch = timeout(ng_fec_tick, priv, hz);
  571 
  572         return;
  573 }
  574 
  575 static void
  576 ng_fec_stop(struct ifnet *ifp)
  577 {
  578         struct ng_fec_private   *priv;
  579         struct ng_fec_bundle    *b;
  580         struct ifnet            *bifp;
  581         struct ng_fec_portlist  *p;
  582 
  583         priv = ifp->if_softc;
  584         b = &priv->fec_bundle;
  585 
  586         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  587                 bifp = p->fec_if;
  588                 bifp->if_flags &= ~IFF_UP;
  589                 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
  590         }
  591 
  592         untimeout(ng_fec_tick, priv, priv->fec_ch);
  593 
  594         return;
  595 }
  596 
  597 static void
  598 ng_fec_tick(void *arg)
  599 {
  600         struct ng_fec_private   *priv;
  601         struct ng_fec_bundle    *b;
  602         struct ifmediareq       ifmr;
  603         struct ifnet            *ifp;
  604         struct ng_fec_portlist  *p;
  605         int                     error = 0;
  606 
  607         priv = arg;
  608         b = &priv->fec_bundle;
  609 
  610         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  611                 bzero((char *)&ifmr, sizeof(ifmr));
  612                 ifp = p->fec_if;
  613                 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr);
  614                 if (error) {
  615                         printf("fec%d: failed to check status "
  616                             "of link %s\n", priv->unit, ifp->if_xname);
  617                         continue;
  618                 }
  619 
  620                 if (ifmr.ifm_status & IFM_AVALID) {
  621                         if (ifmr.ifm_status & IFM_ACTIVE) {
  622                                 if (p->fec_ifstat == -1 ||
  623                                     p->fec_ifstat == 0) {
  624                                         p->fec_ifstat = 1;
  625                                         printf("fec%d: port %s in bundle "
  626                                             "is up\n", priv->unit,
  627                                             ifp->if_xname);
  628                                 }
  629                         } else {
  630                                 if (p->fec_ifstat == -1 ||
  631                                     p->fec_ifstat == 1) {
  632                                         p->fec_ifstat = 0;
  633                                         printf("fec%d: port %s in bundle "
  634                                             "is down\n", priv->unit,
  635                                             ifp->if_xname);
  636                                 }
  637                         }
  638                 }
  639         }
  640 
  641         ifp = &priv->arpcom.ac_if;
  642         if (ifp->if_flags & IFF_RUNNING)
  643                 priv->fec_ch = timeout(ng_fec_tick, priv, hz);
  644 
  645         return;
  646 }
  647 
  648 static int
  649 ng_fec_ifmedia_upd(struct ifnet *ifp)
  650 {
  651         return(0);
  652 }
  653 
  654 static void ng_fec_ifmedia_sts(struct ifnet *ifp,
  655         struct ifmediareq *ifmr)
  656 {
  657         struct ng_fec_private   *priv;
  658         struct ng_fec_bundle    *b;
  659         struct ng_fec_portlist  *p;
  660 
  661         priv = ifp->if_softc;
  662         b = &priv->fec_bundle;
  663 
  664         ifmr->ifm_status = IFM_AVALID;
  665         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  666                 if (p->fec_ifstat) {
  667                         ifmr->ifm_status |= IFM_ACTIVE;
  668                         break;
  669                 }
  670         }
  671 
  672         return;
  673 }
  674 
  675 /*
  676  * Process an ioctl for the virtual interface
  677  */
  678 static int
  679 ng_fec_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
  680 {
  681         struct ifreq *const ifr = (struct ifreq *) data;
  682         int s, error = 0;
  683         struct ng_fec_private   *priv;
  684         struct ng_fec_bundle    *b;
  685 
  686         priv = ifp->if_softc;
  687         b = &priv->fec_bundle;
  688 
  689 #ifdef DEBUG
  690         ng_fec_print_ioctl(ifp, command, data);
  691 #endif
  692         s = splimp();
  693         switch (command) {
  694 
  695         /* These two are mostly handled at a higher layer */
  696         case SIOCSIFADDR:
  697         case SIOCGIFADDR:
  698         case SIOCSIFMTU:
  699                 error = ether_ioctl(ifp, command, data);
  700                 break;
  701 
  702         /* Set flags */
  703         case SIOCSIFFLAGS:
  704                 /*
  705                  * If the interface is marked up and stopped, then start it.
  706                  * If it is marked down and running, then stop it.
  707                  */
  708                 if (ifr->ifr_flags & IFF_UP) {
  709                         if (!(ifp->if_flags & IFF_RUNNING)) {
  710                                 /* Sanity. */
  711                                 if (b->fec_ifcnt == 1 || b->fec_ifcnt == 3) {
  712                                         printf("fec%d: invalid bundle "
  713                                             "size: %d\n", priv->unit,
  714                                             b->fec_ifcnt);
  715                                         error = EINVAL;
  716                                         break;
  717                                 }
  718                                 ifp->if_flags &= ~(IFF_OACTIVE);
  719                                 ifp->if_flags |= IFF_RUNNING;
  720                                 ng_fec_init(ifp);
  721                         }
  722                         /*
  723                          * Bubble down changes in promisc mode to
  724                          * underlying interfaces.
  725                          */
  726                         if ((ifp->if_flags & IFF_PROMISC) !=
  727                             (priv->if_flags & IFF_PROMISC)) {
  728                                 ng_fec_setport(ifp, command, data);
  729                                 priv->if_flags = ifp->if_flags;
  730                         }
  731                 } else {
  732                         if (ifp->if_flags & IFF_RUNNING)
  733                                 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
  734                         ng_fec_stop(ifp);
  735                 }
  736                 break;
  737 
  738         case SIOCADDMULTI:
  739         case SIOCDELMULTI:
  740                 ng_fec_setport(ifp, command, data);
  741                 error = 0;
  742                 break;
  743         case SIOCGIFMEDIA:
  744         case SIOCSIFMEDIA:
  745                 error = ifmedia_ioctl(ifp, ifr, &priv->ifmedia, command);
  746                 break;
  747         /* Stuff that's not supported */
  748         case SIOCSIFPHYS:
  749                 error = EOPNOTSUPP;
  750                 break;
  751 
  752         default:
  753                 error = EINVAL;
  754                 break;
  755         }
  756         (void) splx(s);
  757         return (error);
  758 }
  759 
  760 /*
  761  * This routine spies on mbufs received by underlying network device
  762  * drivers. When we add an interface to our bundle, we override its
  763  * if_input routine with a pointer to ng_fec_input(). This means we
  764  * get to look at all the device's packets before sending them to the
  765  * real ether_input() for processing by the stack. Once we verify the
  766  * packet comes from an interface that's been aggregated into
  767  * our bundle, we fix up the rcvif pointer and increment our
  768  * packet counters so that it looks like the frames are actually
  769  * coming from us.
  770  */
  771 static void 
  772 ng_fec_input(struct ifnet *ifp, struct mbuf *m0)
  773 {
  774         struct ng_node          *node;
  775         struct ng_fec_private   *priv;
  776         struct ng_fec_bundle    *b;
  777         struct ifnet            *bifp;
  778         struct ng_fec_portlist  *p;
  779 
  780         /* Sanity check */
  781         if (ifp == NULL || m0 == NULL)
  782                 return;
  783 
  784         node = IFP2NG(ifp);
  785 
  786         /* Sanity check part II */
  787         if (node == NULL)
  788                 return;
  789 
  790         priv = NG_NODE_PRIVATE(node);
  791         b = &priv->fec_bundle;
  792         bifp = &priv->arpcom.ac_if;
  793 
  794         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  795                 if (p->fec_if == m0->m_pkthdr.rcvif)
  796                         break;
  797         }
  798 
  799         /* Wasn't meant for us; leave this frame alone. */
  800         if (p == NULL)
  801                 return;
  802 
  803         /*
  804          * Check for a BPF tap on the underlying interface. This
  805          * is mainly a debugging aid: it allows tcpdump-ing of an
  806          * individual interface in a bundle to work, which it
  807          * otherwise would not. BPF tapping of our own aggregate
  808          * interface will occur once we call ether_input().
  809          */
  810         BPF_MTAP(m0->m_pkthdr.rcvif, m0);
  811 
  812         /* Convince the system that this is our frame. */
  813         m0->m_pkthdr.rcvif = bifp;
  814         bifp->if_ipackets++;
  815         bifp->if_ibytes += m0->m_pkthdr.len + sizeof(struct ether_header);
  816 
  817         (*bifp->if_input)(bifp, m0);
  818 
  819         return;
  820 }
  821 
  822 /*
  823  * Take a quick peek at the packet and see if it's ok for us to use
  824  * the inet or inet6 hash methods on it, if they're enabled. We do
  825  * this by setting flags in the mbuf header. Once we've made up our
  826  * mind what to do, we pass the frame to output vector for further
  827  * processing.
  828  */
  829 
  830 static int
  831 ng_fec_output(struct ifnet *ifp, struct mbuf *m,
  832                 struct sockaddr *dst, struct rtentry *rt0)
  833 {
  834         const priv_p priv = (priv_p) ifp->if_softc;
  835         struct ng_fec_bundle *b;
  836         int error;
  837 
  838         /* Check interface flags */
  839         if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
  840                 m_freem(m);
  841                 return (ENETDOWN);
  842         }
  843 
  844         b = &priv->fec_bundle;
  845 
  846         switch (b->fec_btype) {
  847         case FEC_BTYPE_MAC:
  848                 m->m_flags |= M_FEC_MAC;
  849                 break;
  850 #ifdef INET
  851         case FEC_BTYPE_INET:
  852                 /*
  853                  * We can't use the INET address port selection
  854                  * scheme if this isn't an INET packet.
  855                  */
  856                 if (dst->sa_family == AF_INET)
  857                         m->m_flags |= M_FEC_INET;
  858 #ifdef INET6
  859                 else if (dst->sa_family == AF_INET6)
  860                         m->m_flags |= M_FEC_INET6;
  861 #endif
  862                 else {
  863 #ifdef DEBUG
  864                         if_printf(ifp, "can't do inet aggregation of non "
  865                             "inet packet\n");
  866 #endif
  867                         m->m_flags |= M_FEC_MAC;
  868                 }
  869                 break;
  870 #endif
  871         default:
  872                 if_printf(ifp, "bogus hash type: %d\n",
  873                     b->fec_btype);
  874                 m_freem(m);
  875                 return(EINVAL);
  876                 break;
  877         }
  878 
  879         /*
  880          * Pass the frame to the output vector for all the protocol
  881          * handling. This will put the ethernet header on the packet
  882          * for us.
  883          */
  884         priv->if_error = 0;
  885         error = (*b->fec_if_output)(ifp, m, dst, rt0);
  886         if (priv->if_error && !error)
  887                 error = priv->if_error;
  888 
  889         return(error);
  890 }
  891 
  892 /*
  893  * Apply a hash to the source and destination addresses in the packet
  894  * in order to select an interface. Also check link status and handle
  895  * dead links accordingly.
  896  */
  897 
  898 static int
  899 ng_fec_choose_port(struct ng_fec_bundle *b,
  900         struct mbuf *m, struct ifnet **ifp)
  901 {
  902         struct ether_header     *eh;
  903         struct mbuf             *m0;
  904 #ifdef INET
  905         struct ip               *ip;
  906 #ifdef INET6
  907         struct ip6_hdr          *ip6;
  908 #endif
  909 #endif
  910 
  911         struct ng_fec_portlist  *p;
  912         int                     port = 0, mask;
  913 
  914         /*
  915          * If there are only two ports, mask off all but the
  916          * last bit for XORing. If there are 4, mask off all
  917          * but the last 2 bits.
  918          */
  919         mask = b->fec_ifcnt == 2 ? 0x1 : 0x3;
  920         eh = mtod(m, struct ether_header *);
  921 #ifdef INET
  922         ip = (struct ip *)(mtod(m, char *) +
  923             sizeof(struct ether_header));
  924 #ifdef INET6
  925         ip6 = (struct ip6_hdr *)(mtod(m, char *) +
  926             sizeof(struct ether_header));
  927 #endif
  928 #endif
  929 
  930         /*
  931          * The fg_fec_output() routine is supposed to leave a
  932          * flag for us in the mbuf that tells us what hash to
  933          * use, but sometimes a new mbuf is prepended to the
  934          * chain, so we have to search every mbuf in the chain
  935          * to find the flags.
  936          */
  937         m0 = m;
  938         while (m0) {
  939                 if (m0->m_flags & (M_FEC_MAC|M_FEC_INET|M_FEC_INET6))
  940                         break;
  941                 m0 = m0->m_next;
  942         }
  943         if (m0 == NULL)
  944                 return(EINVAL);
  945 
  946         switch (m0->m_flags & (M_FEC_MAC|M_FEC_INET|M_FEC_INET6)) {
  947         case M_FEC_MAC:
  948                 port = (eh->ether_dhost[5] ^
  949                     eh->ether_shost[5]) & mask;
  950                 break;
  951 #ifdef INET
  952         case M_FEC_INET:
  953                 port = (ntohl(ip->ip_dst.s_addr) ^
  954                     ntohl(ip->ip_src.s_addr)) & mask;
  955                 break;
  956 #ifdef INET6
  957         case M_FEC_INET6:
  958                 port = (ip6->ip6_dst.s6_addr[15] ^
  959                     ip6->ip6_dst.s6_addr[15]) & mask;
  960                 break;
  961 #endif
  962 #endif
  963         default:
  964                 return(EINVAL);
  965                         break;
  966         }
  967 
  968         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  969                 if (port == p->fec_idx)
  970                         break;
  971         }
  972 
  973         /*
  974          * Now that we've chosen a port, make sure it's
  975          * alive. If it's not alive, cycle through the bundle
  976          * looking for a port that is alive. If we don't find
  977          * any, return an error.
  978          */
  979         if (p->fec_ifstat != 1) {
  980                 struct ng_fec_portlist  *n = NULL;
  981 
  982                 n = TAILQ_NEXT(p, fec_list);
  983                 if (n == NULL)
  984                         n = TAILQ_FIRST(&b->ng_fec_ports);
  985                 while (n != p) {
  986                         if (n->fec_ifstat == 1)
  987                                 break;
  988                         n = TAILQ_NEXT(n, fec_list);
  989                         if (n == NULL)
  990                                 n = TAILQ_FIRST(&b->ng_fec_ports);
  991                 }
  992                 if (n == p)
  993                         return(EAGAIN);
  994                 p = n;
  995         }
  996 
  997         *ifp = p->fec_if;
  998 
  999         return(0);
 1000 }
 1001 
 1002 /*
 1003  * Now that the packet has been run through ether_output(), yank it
 1004  * off our own send queue and stick it on the queue for the appropriate
 1005  * underlying physical interface. Note that if the interface's send
 1006  * queue is full, we save an error status in our private netgraph
 1007  * space which will eventually be handed up to ng_fec_output(), which
 1008  * will return it to the rest of the IP stack. We need to do this
 1009  * in order to duplicate the effect of ether_output() returning ENOBUFS
 1010  * when it detects that an interface's send queue is full. There's no
 1011  * other way to signal the error status from here since the if_start()
 1012  * routine is spec'ed to return void.
 1013  *
 1014  * Once the frame is queued, we call ether_output_frame() to initiate
 1015  * transmission.
 1016  */
 1017 static void
 1018 ng_fec_start(struct ifnet *ifp)
 1019 {
 1020         struct ng_fec_private   *priv;
 1021         struct ng_fec_bundle    *b;
 1022         struct ifnet            *oifp = NULL;
 1023         struct mbuf             *m0;
 1024         int                     error;
 1025 
 1026         priv = ifp->if_softc;
 1027         b = &priv->fec_bundle;
 1028 
 1029         IF_DEQUEUE(&ifp->if_snd, m0);
 1030         if (m0 == NULL)
 1031                 return;
 1032 
 1033         BPF_MTAP(ifp, m0);
 1034 
 1035         /* Queue up packet on the proper port. */
 1036         error = ng_fec_choose_port(b, m0, &oifp);
 1037         if (error) {
 1038                 ifp->if_ierrors++;
 1039                 m_freem(m0);
 1040                 priv->if_error = ENOBUFS;
 1041                 return;
 1042         }
 1043         ifp->if_opackets++;
 1044 
 1045         priv->if_error = IF_HANDOFF(&oifp->if_snd, m0, oifp) ? 0 : ENOBUFS;
 1046 
 1047         return;
 1048 }
 1049 
 1050 #ifdef DEBUG
 1051 /*
 1052  * Display an ioctl to the virtual interface
 1053  */
 1054 
 1055 static void
 1056 ng_fec_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
 1057 {
 1058         char   *str;
 1059 
 1060         switch (command & IOC_DIRMASK) {
 1061         case IOC_VOID:
 1062                 str = "IO";
 1063                 break;
 1064         case IOC_OUT:
 1065                 str = "IOR";
 1066                 break;
 1067         case IOC_IN:
 1068                 str = "IOW";
 1069                 break;
 1070         case IOC_INOUT:
 1071                 str = "IORW";
 1072                 break;
 1073         default:
 1074                 str = "IO??";
 1075         }
 1076         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
 1077                ifp->if_xname,
 1078                str,
 1079                IOCGROUP(command),
 1080                command & 0xff,
 1081                IOCPARM_LEN(command));
 1082 }
 1083 #endif /* DEBUG */
 1084 
 1085 /************************************************************************
 1086                         NETGRAPH NODE STUFF
 1087  ************************************************************************/
 1088 
 1089 /*
 1090  * Constructor for a node
 1091  */
 1092 static int
 1093 ng_fec_constructor(node_p node)
 1094 {
 1095         char ifname[NG_FEC_FEC_NAME_MAX + 1];
 1096         struct ifnet *ifp;
 1097         priv_p priv;
 1098         struct ng_fec_bundle *b;
 1099         int error = 0;
 1100 
 1101         /* Allocate node and interface private structures */
 1102         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT);
 1103         if (priv == NULL)
 1104                 return (ENOMEM);
 1105         bzero(priv, sizeof(*priv));
 1106 
 1107         ifp = &priv->arpcom.ac_if;
 1108         b = &priv->fec_bundle;
 1109 
 1110         /* Link them together */
 1111         ifp->if_softc = priv;
 1112 
 1113         /* Get an interface unit number */
 1114         if ((error = ng_fec_get_unit(&priv->unit)) != 0) {
 1115                 FREE(ifp, M_NETGRAPH);
 1116                 FREE(priv, M_NETGRAPH);
 1117                 return (error);
 1118         }
 1119 
 1120         /* Link together node and private info */
 1121         NG_NODE_SET_PRIVATE(node, priv);
 1122         priv->node = node;
 1123 
 1124         /* Initialize interface structure */
 1125         if_initname(ifp, NG_FEC_FEC_NAME, priv->unit);
 1126         ifp->if_start = ng_fec_start;
 1127         ifp->if_ioctl = ng_fec_ioctl;
 1128         ifp->if_init = ng_fec_init;
 1129         ifp->if_watchdog = NULL;
 1130         ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
 1131         ifp->if_mtu = NG_FEC_MTU_DEFAULT;
 1132         ifp->if_flags = (IFF_SIMPLEX|IFF_BROADCAST|IFF_MULTICAST);
 1133         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
 1134         ifp->if_addrlen = 0;                    /* XXX */
 1135         ifp->if_hdrlen = 0;                     /* XXX */
 1136         ifp->if_baudrate = 100000000;           /* XXX */
 1137         TAILQ_INIT(&ifp->if_addrhead); /* XXX useless - done in if_attach */
 1138 
 1139         /* Give this node the same name as the interface (if possible) */
 1140         bzero(ifname, sizeof(ifname));
 1141         strlcpy(ifname, ifp->if_xname, sizeof(ifname));
 1142         if (ng_name_node(node, ifname) != 0)
 1143                 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname);
 1144 
 1145         /* Attach the interface */
 1146         ether_ifattach(ifp, priv->arpcom.ac_enaddr);
 1147         callout_handle_init(&priv->fec_ch);
 1148 
 1149         /* Override output method with our own */
 1150         ifp->if_output = ng_fec_output;
 1151 
 1152         TAILQ_INIT(&b->ng_fec_ports);
 1153         b->fec_ifcnt = 0;
 1154 
 1155         ifmedia_init(&priv->ifmedia, 0,
 1156             ng_fec_ifmedia_upd, ng_fec_ifmedia_sts);
 1157         ifmedia_add(&priv->ifmedia, IFM_ETHER|IFM_NONE, 0, NULL);
 1158         ifmedia_set(&priv->ifmedia, IFM_ETHER|IFM_NONE);
 1159 
 1160         /* Done */
 1161         return (0);
 1162 }
 1163 
 1164 /*
 1165  * Receive a control message
 1166  */
 1167 static int
 1168 ng_fec_rcvmsg(node_p node, item_p item, hook_p lasthook)
 1169 {
 1170         const priv_p priv = NG_NODE_PRIVATE(node);
 1171         struct ng_fec_bundle    *b;
 1172         struct ng_mesg *resp = NULL;
 1173         struct ng_mesg *msg;
 1174         char *ifname;
 1175         int error = 0;
 1176 
 1177         NGI_GET_MSG(item, msg);
 1178         b = &priv->fec_bundle;
 1179 
 1180         switch (msg->header.typecookie) {
 1181         case NGM_FEC_COOKIE:
 1182                 switch (msg->header.cmd) {
 1183                 case NGM_FEC_ADD_IFACE:
 1184                         ifname = msg->data;
 1185                         error = ng_fec_addport(priv, ifname);
 1186                         break;
 1187                 case NGM_FEC_DEL_IFACE:
 1188                         ifname = msg->data;
 1189                         error = ng_fec_delport(priv, ifname);
 1190                         break;
 1191                 case NGM_FEC_SET_MODE_MAC:
 1192                         b->fec_btype = FEC_BTYPE_MAC;
 1193                         break;
 1194 #ifdef INET
 1195                 case NGM_FEC_SET_MODE_INET:
 1196                         b->fec_btype = FEC_BTYPE_INET;
 1197                         break;
 1198 #ifdef INET6
 1199                 case NGM_FEC_SET_MODE_INET6:
 1200                         b->fec_btype = FEC_BTYPE_INET6;
 1201                         break;
 1202 #endif
 1203 #endif
 1204                 default:
 1205                         error = EINVAL;
 1206                         break;
 1207                 }
 1208                 break;
 1209         default:
 1210                 error = EINVAL;
 1211                 break;
 1212         }
 1213         NG_RESPOND_MSG(error, node, item, resp);
 1214         NG_FREE_MSG(msg);
 1215         return (error);
 1216 }
 1217 
 1218 /*
 1219  * Shutdown and remove the node and its associated interface.
 1220  */
 1221 static int
 1222 ng_fec_shutdown(node_p node)
 1223 {
 1224         const priv_p priv = NG_NODE_PRIVATE(node);
 1225         struct ng_fec_bundle *b;
 1226         struct ng_fec_portlist  *p;
 1227 
 1228         b = &priv->fec_bundle;
 1229         ng_fec_stop(&priv->arpcom.ac_if);
 1230 
 1231         while (!TAILQ_EMPTY(&b->ng_fec_ports)) {
 1232                 p = TAILQ_FIRST(&b->ng_fec_ports);
 1233                 ng_fec_delport(priv, p->fec_if->if_xname);
 1234         }
 1235 
 1236         ether_ifdetach(&priv->arpcom.ac_if);
 1237         ifmedia_removeall(&priv->ifmedia);
 1238         ng_fec_free_unit(priv->unit);
 1239         FREE(priv, M_NETGRAPH);
 1240         NG_NODE_SET_PRIVATE(node, NULL);
 1241         NG_NODE_UNREF(node);
 1242         return (0);
 1243 }

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