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: src/sys/netgraph/ng_fec.c,v 1.14.2.2 2005/08/29 16:31:51 emax Exp $
   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_types.h>
  106 #include <net/if_arp.h>
  107 #include <net/if_dl.h>
  108 #include <net/if_media.h>
  109 #include <net/bpf.h>
  110 #include <net/ethernet.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)  (struct ng_node *)(ifp->if_afdata[AF_NETGRAPH])
  139 #define IFP2NG_SET(ifp, val)  ifp->if_afdata[AF_NETGRAPH] = (val);
  140 #define FEC_INC(x, y)   (x) = (x + 1) % y
  141 
  142 /*
  143  * Current fast etherchannel implementations use either 2 or 4
  144  * ports, so for now we limit the maximum bundle size to 4 interfaces.
  145  */
  146 #define FEC_BUNDLESIZ   4
  147 
  148 struct ng_fec_portlist {
  149         struct ifnet            *fec_if;
  150         void                    (*fec_if_input) (struct ifnet *,
  151                                                  struct mbuf *);
  152         int                     fec_idx;
  153         int                     fec_ifstat;
  154         struct ether_addr       fec_mac;
  155         TAILQ_ENTRY(ng_fec_portlist) fec_list;
  156 };
  157 
  158 struct ng_fec_bundle {
  159         TAILQ_HEAD(,ng_fec_portlist) ng_fec_ports;
  160         int                     fec_ifcnt;
  161         int                     fec_btype;
  162         int                     (*fec_if_output) (struct ifnet *,
  163                                                   struct mbuf *,
  164                                                   struct sockaddr *,
  165                                                   struct rtentry *);
  166 };
  167 
  168 #define FEC_BTYPE_MAC           0x01
  169 #define FEC_BTYPE_INET          0x02
  170 #define FEC_BTYPE_INET6         0x03
  171 
  172 /* Node private data */
  173 struct ng_fec_private {
  174         struct arpcom arpcom;
  175         struct ifmedia ifmedia;
  176         int     if_flags;
  177         int     if_error;               /* XXX */
  178         int     unit;                   /* Interface unit number */
  179         node_p  node;                   /* Our netgraph node */
  180         struct ng_fec_bundle fec_bundle;/* Aggregate bundle */
  181         struct callout_handle fec_ch;   /* callout handle for ticker */
  182 };
  183 typedef struct ng_fec_private *priv_p;
  184 
  185 /* Interface methods */
  186 static void     ng_fec_input(struct ifnet *, struct mbuf *);
  187 static void     ng_fec_start(struct ifnet *ifp);
  188 static int      ng_fec_choose_port(struct ng_fec_bundle *b,
  189                         struct mbuf *m, struct ifnet **ifp);
  190 static int      ng_fec_setport(struct ifnet *ifp, u_long cmd, caddr_t data);
  191 static void     ng_fec_init(void *arg);
  192 static void     ng_fec_stop(struct ifnet *ifp);
  193 static int      ng_fec_ifmedia_upd(struct ifnet *ifp);
  194 static void     ng_fec_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr);
  195 static int      ng_fec_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
  196 static int      ng_fec_output(struct ifnet *ifp, struct mbuf *m0,
  197                         struct sockaddr *dst, struct rtentry *rt0);
  198 static void     ng_fec_tick(void *arg);
  199 static int      ng_fec_addport(struct ng_fec_private *priv, char *iface);
  200 static int      ng_fec_delport(struct ng_fec_private *priv, char *iface);
  201 
  202 #ifdef DEBUG
  203 static void     ng_fec_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
  204 #endif
  205 
  206 /* Netgraph methods */
  207 static ng_constructor_t ng_fec_constructor;
  208 static ng_rcvmsg_t      ng_fec_rcvmsg;
  209 static ng_shutdown_t    ng_fec_shutdown;
  210 
  211 /* List of commands and how to convert arguments to/from ASCII */
  212 static const struct ng_cmdlist ng_fec_cmds[] = {
  213         {
  214           NGM_FEC_COOKIE,
  215           NGM_FEC_ADD_IFACE,
  216           "add_iface",
  217           &ng_parse_string_type,
  218           NULL,
  219         },
  220         {
  221           NGM_FEC_COOKIE,
  222           NGM_FEC_DEL_IFACE,
  223           "del_iface",
  224           &ng_parse_string_type,
  225           NULL,
  226         },
  227         {
  228           NGM_FEC_COOKIE,
  229           NGM_FEC_SET_MODE_MAC,
  230           "set_mode_mac",
  231           NULL,
  232           NULL,
  233         },
  234         {
  235           NGM_FEC_COOKIE,
  236           NGM_FEC_SET_MODE_INET,
  237           "set_mode_inet",
  238           NULL,
  239           NULL,
  240         },
  241         { 0 }
  242 };
  243 
  244 /* Node type descriptor */
  245 static struct ng_type typestruct = {
  246         .version =      NG_ABI_VERSION,
  247         .name =         NG_FEC_NODE_TYPE,
  248         .constructor =  ng_fec_constructor,
  249         .rcvmsg =       ng_fec_rcvmsg,
  250         .shutdown =     ng_fec_shutdown,
  251         .cmdlist =      ng_fec_cmds,
  252 };
  253 NETGRAPH_INIT(fec, &typestruct);
  254 
  255 /* We keep a bitmap indicating which unit numbers are free.
  256    One means the unit number is free, zero means it's taken. */
  257 static int      *ng_fec_units = NULL;
  258 static int      ng_fec_units_len = 0;
  259 static int      ng_units_in_use = 0;
  260 
  261 #define UNITS_BITSPERWORD       (sizeof(*ng_fec_units) * NBBY)
  262 
  263 static struct mtx       ng_fec_mtx;
  264 MTX_SYSINIT(ng_fec, &ng_fec_mtx, "ng_fec", MTX_DEF);
  265 
  266 /*
  267  * Find the first free unit number for a new interface.
  268  * Increase the size of the unit bitmap as necessary.
  269  */
  270 static __inline int
  271 ng_fec_get_unit(int *unit)
  272 {
  273         int index, bit;
  274 
  275         mtx_lock(&ng_fec_mtx);
  276         for (index = 0; index < ng_fec_units_len
  277             && ng_fec_units[index] == 0; index++);
  278         if (index == ng_fec_units_len) {                /* extend array */
  279                 int i, *newarray, newlen;
  280 
  281                 newlen = (2 * ng_fec_units_len) + 4;
  282                 MALLOC(newarray, int *, newlen * sizeof(*ng_fec_units),
  283                     M_NETGRAPH, M_NOWAIT);
  284                 if (newarray == NULL) {
  285                         mtx_unlock(&ng_fec_mtx);
  286                         return (ENOMEM);
  287                 }
  288                 bcopy(ng_fec_units, newarray,
  289                     ng_fec_units_len * sizeof(*ng_fec_units));
  290                 for (i = ng_fec_units_len; i < newlen; i++)
  291                         newarray[i] = ~0;
  292                 if (ng_fec_units != NULL)
  293                         FREE(ng_fec_units, M_NETGRAPH);
  294                 ng_fec_units = newarray;
  295                 ng_fec_units_len = newlen;
  296         }
  297         bit = ffs(ng_fec_units[index]) - 1;
  298         KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1,
  299             ("%s: word=%d bit=%d", __FUNCTION__, ng_fec_units[index], bit));
  300         ng_fec_units[index] &= ~(1 << bit);
  301         *unit = (index * UNITS_BITSPERWORD) + bit;
  302         ng_units_in_use++;
  303         mtx_unlock(&ng_fec_mtx);
  304         return (0);
  305 }
  306 
  307 /*
  308  * Free a no longer needed unit number.
  309  */
  310 static __inline void
  311 ng_fec_free_unit(int unit)
  312 {
  313         int index, bit;
  314 
  315         index = unit / UNITS_BITSPERWORD;
  316         bit = unit % UNITS_BITSPERWORD;
  317         mtx_lock(&ng_fec_mtx);
  318         KASSERT(index < ng_fec_units_len,
  319             ("%s: unit=%d len=%d", __FUNCTION__, unit, ng_fec_units_len));
  320         KASSERT((ng_fec_units[index] & (1 << bit)) == 0,
  321             ("%s: unit=%d is free", __FUNCTION__, unit));
  322         ng_fec_units[index] |= (1 << bit);
  323         /*
  324          * XXX We could think about reducing the size of ng_fec_units[]
  325          * XXX here if the last portion is all ones
  326          * XXX At least free it if no more units
  327          * Needed if we are to eventually be able to unload.
  328          */
  329         ng_units_in_use--;
  330         if (ng_units_in_use == 0) { /* XXX make SMP safe */
  331                 FREE(ng_fec_units, M_NETGRAPH);
  332                 ng_fec_units_len = 0;
  333                 ng_fec_units = NULL;
  334         }
  335         mtx_unlock(&ng_fec_mtx);
  336 }
  337 
  338 /************************************************************************
  339                         INTERFACE STUFF
  340  ************************************************************************/
  341 
  342 static int
  343 ng_fec_addport(struct ng_fec_private *priv, char *iface)
  344 {
  345         struct ng_fec_bundle    *b;
  346         struct ifnet            *ifp, *bifp;
  347         struct arpcom           *ac;
  348         struct ifaddr           *ifa;
  349         struct sockaddr_dl      *sdl;
  350         struct ng_fec_portlist  *p, *new;
  351 
  352         if (priv == NULL || iface == NULL)
  353                 return(EINVAL);
  354 
  355         b = &priv->fec_bundle;
  356         ifp = &priv->arpcom.ac_if;
  357 
  358         /* Find the interface */
  359         bifp = ifunit(iface);
  360         if (bifp == NULL) {
  361                 printf("fec%d: tried to add iface %s, which "
  362                     "doesn't seem to exist\n", priv->unit, iface);
  363                 return(ENOENT);
  364         }
  365 
  366         /* See if we have room in the bundle */
  367         if (b->fec_ifcnt == FEC_BUNDLESIZ) {
  368                 printf("fec%d: can't add new iface; bundle is full\n",
  369                     priv->unit);
  370                 return(ENOSPC);
  371         }
  372 
  373         /* See if the interface is already in the bundle */
  374         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  375                 if (p->fec_if == bifp) {
  376                         printf("fec%d: iface %s is already in this "
  377                             "bundle\n", priv->unit, iface);
  378                         return(EINVAL);
  379                 }
  380         }
  381 
  382         /*
  383          * All interfaces must use the same output vector. Once the
  384          * user attaches an interface of one type, make all subsequent
  385          * interfaces have the same output vector.
  386          */
  387         if (b->fec_if_output != NULL) {
  388                 if (b->fec_if_output != bifp->if_output) {
  389                         printf("fec%d: iface %s is not the same type "
  390                             "as the other interface(s) already in "
  391                             "the bundle\n", priv->unit, iface);
  392                         return(EINVAL);
  393                 }
  394         }
  395 
  396         /* Allocate new list entry. */
  397         MALLOC(new, struct ng_fec_portlist *,
  398             sizeof(struct ng_fec_portlist), M_NETGRAPH, M_NOWAIT);
  399         if (new == NULL)
  400                 return(ENOMEM);
  401 
  402         ac = (struct arpcom *)bifp;
  403 
  404         IF_AFDATA_LOCK(bifp);
  405         bifp->if_afdata[AF_NETGRAPH] = priv->node;
  406         IF_AFDATA_UNLOCK(bifp);
  407 
  408         /*
  409          * If this is the first interface added to the bundle,
  410          * use its MAC address for the virtual interface (and,
  411          * by extension, all the other ports in the bundle).
  412          */
  413         if (b->fec_ifcnt == 0) {
  414                 ifa = ifaddr_byindex(ifp->if_index);
  415                 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  416                 bcopy((char *)ac->ac_enaddr,
  417                     priv->arpcom.ac_enaddr, ETHER_ADDR_LEN);
  418                 bcopy((char *)ac->ac_enaddr,
  419                     LLADDR(sdl), ETHER_ADDR_LEN);
  420         }
  421 
  422         b->fec_btype = FEC_BTYPE_MAC;
  423         new->fec_idx = b->fec_ifcnt;
  424         b->fec_ifcnt++;
  425 
  426         /* Save the real MAC address. */
  427         bcopy((char *)ac->ac_enaddr,
  428             (char *)&new->fec_mac, ETHER_ADDR_LEN);
  429 
  430         /* Set up phony MAC address. */
  431         ifa = ifaddr_byindex(bifp->if_index);
  432         sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  433         bcopy(priv->arpcom.ac_enaddr, ac->ac_enaddr, ETHER_ADDR_LEN);
  434         bcopy(priv->arpcom.ac_enaddr, LLADDR(sdl), ETHER_ADDR_LEN);
  435 
  436         /* Save original input vector */
  437         new->fec_if_input = bifp->if_input;
  438 
  439         /* Override it with our own */
  440         bifp->if_input = ng_fec_input;
  441 
  442         /* Save output vector too. */
  443         if (b->fec_if_output == NULL)
  444                 b->fec_if_output = bifp->if_output;
  445 
  446         /* Add to the queue */
  447         new->fec_if = bifp;
  448         TAILQ_INSERT_TAIL(&b->ng_fec_ports, new, fec_list);
  449 
  450         return(0);
  451 }
  452 
  453 static int
  454 ng_fec_delport(struct ng_fec_private *priv, char *iface)
  455 {
  456         struct ng_fec_bundle    *b;
  457         struct ifnet            *ifp, *bifp;
  458         struct arpcom           *ac;
  459         struct ifaddr           *ifa;
  460         struct sockaddr_dl      *sdl;
  461         struct ng_fec_portlist  *p;
  462 
  463         if (priv == NULL || iface == NULL)
  464                 return(EINVAL);
  465 
  466         b = &priv->fec_bundle;
  467         ifp = &priv->arpcom.ac_if;
  468 
  469         /* Find the interface */
  470         bifp = ifunit(iface);
  471         if (bifp == NULL) {
  472                 printf("fec%d: tried to remove iface %s, which "
  473                     "doesn't seem to exist\n", priv->unit, iface);
  474                 return(ENOENT);
  475         }
  476 
  477         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  478                 if (p->fec_if == bifp)
  479                         break;
  480         }
  481 
  482         if (p == NULL) {
  483                 printf("fec%d: tried to remove iface %s which "
  484                     "is not in our bundle\n", priv->unit, iface);
  485                 return(EINVAL);
  486         }
  487 
  488         /* Stop interface */
  489         bifp->if_flags &= ~IFF_UP;
  490         (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
  491 
  492         /* Restore MAC address. */
  493         ac = (struct arpcom *)bifp;
  494         ifa = ifaddr_byindex(bifp->if_index);
  495         sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  496         bcopy((char *)&p->fec_mac, ac->ac_enaddr, ETHER_ADDR_LEN);
  497         bcopy((char *)&p->fec_mac, LLADDR(sdl), ETHER_ADDR_LEN);
  498 
  499         /* Restore input vector */
  500         bifp->if_input = p->fec_if_input;
  501 
  502         /* Remove our node context pointer. */
  503         IF_AFDATA_LOCK(bifp);
  504         bifp->if_afdata[AF_NETGRAPH] = NULL;
  505         IF_AFDATA_UNLOCK(bifp);
  506 
  507         /* Delete port */
  508         TAILQ_REMOVE(&b->ng_fec_ports, p, fec_list);
  509         FREE(p, M_NETGRAPH);
  510         b->fec_ifcnt--;
  511 
  512         if (b->fec_ifcnt == 0)
  513                 b->fec_if_output = NULL;
  514 
  515         return(0);
  516 }
  517 
  518 /*
  519  * Pass an ioctl command down to all the underyling interfaces in a
  520  * bundle. Used for setting multicast filters and flags.
  521  */
  522 
  523 static int 
  524 ng_fec_setport(struct ifnet *ifp, u_long command, caddr_t data)
  525 {
  526         struct ng_fec_private   *priv;
  527         struct ng_fec_bundle    *b;
  528         struct ifnet            *oifp;
  529         struct ng_fec_portlist  *p;
  530 
  531         priv = ifp->if_softc;
  532         b = &priv->fec_bundle;
  533 
  534         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  535                 oifp = p->fec_if;
  536                 if (oifp != NULL)
  537                         (*oifp->if_ioctl)(oifp, command, data);
  538         }
  539 
  540         return(0);
  541 }
  542 
  543 static void
  544 ng_fec_init(void *arg)
  545 {
  546         struct ng_fec_private   *priv;
  547         struct ng_fec_bundle    *b;
  548         struct ifnet            *ifp, *bifp;
  549         struct ng_fec_portlist  *p;
  550 
  551         priv = arg;
  552         ifp = &priv->arpcom.ac_if;
  553         b = &priv->fec_bundle;
  554 
  555         if (b->fec_ifcnt == 1 || b->fec_ifcnt == 3) {
  556                 printf("fec%d: invalid bundle "
  557                     "size: %d\n", priv->unit,
  558                     b->fec_ifcnt);
  559                 return;
  560         }
  561 
  562         ng_fec_stop(ifp);
  563 
  564         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  565                 bifp = p->fec_if;
  566                 bifp->if_flags |= IFF_UP;
  567                 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
  568                 /* mark iface as up and let the monitor check it */
  569                 p->fec_ifstat = -1;
  570         }
  571 
  572         priv->fec_ch = timeout(ng_fec_tick, priv, hz);
  573 
  574         return;
  575 }
  576 
  577 static void
  578 ng_fec_stop(struct ifnet *ifp)
  579 {
  580         struct ng_fec_private   *priv;
  581         struct ng_fec_bundle    *b;
  582         struct ifnet            *bifp;
  583         struct ng_fec_portlist  *p;
  584 
  585         priv = ifp->if_softc;
  586         b = &priv->fec_bundle;
  587 
  588         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  589                 bifp = p->fec_if;
  590                 bifp->if_flags &= ~IFF_UP;
  591                 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
  592         }
  593 
  594         untimeout(ng_fec_tick, priv, priv->fec_ch);
  595 
  596         return;
  597 }
  598 
  599 static void
  600 ng_fec_tick(void *arg)
  601 {
  602         struct ng_fec_private   *priv;
  603         struct ng_fec_bundle    *b;
  604         struct ifmediareq       ifmr;
  605         struct ifnet            *ifp;
  606         struct ng_fec_portlist  *p;
  607         int                     error = 0;
  608 
  609         priv = arg;
  610         b = &priv->fec_bundle;
  611 
  612         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  613                 bzero((char *)&ifmr, sizeof(ifmr));
  614                 ifp = p->fec_if;
  615                 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr);
  616                 if (error) {
  617                         printf("fec%d: failed to check status "
  618                             "of link %s\n", priv->unit, ifp->if_xname);
  619                         continue;
  620                 }
  621 
  622                 if (ifmr.ifm_status & IFM_AVALID) {
  623                         if (ifmr.ifm_status & IFM_ACTIVE) {
  624                                 if (p->fec_ifstat == -1 ||
  625                                     p->fec_ifstat == 0) {
  626                                         p->fec_ifstat = 1;
  627                                         printf("fec%d: port %s in bundle "
  628                                             "is up\n", priv->unit,
  629                                             ifp->if_xname);
  630                                 }
  631                         } else {
  632                                 if (p->fec_ifstat == -1 ||
  633                                     p->fec_ifstat == 1) {
  634                                         p->fec_ifstat = 0;
  635                                         printf("fec%d: port %s in bundle "
  636                                             "is down\n", priv->unit,
  637                                             ifp->if_xname);
  638                                 }
  639                         }
  640                 }
  641         }
  642 
  643         ifp = &priv->arpcom.ac_if;
  644         if (ifp->if_flags & IFF_RUNNING)
  645                 priv->fec_ch = timeout(ng_fec_tick, priv, hz);
  646 
  647         return;
  648 }
  649 
  650 static int
  651 ng_fec_ifmedia_upd(struct ifnet *ifp)
  652 {
  653         return(0);
  654 }
  655 
  656 static void ng_fec_ifmedia_sts(struct ifnet *ifp,
  657         struct ifmediareq *ifmr)
  658 {
  659         struct ng_fec_private   *priv;
  660         struct ng_fec_bundle    *b;
  661         struct ng_fec_portlist  *p;
  662 
  663         priv = ifp->if_softc;
  664         b = &priv->fec_bundle;
  665 
  666         ifmr->ifm_status = IFM_AVALID;
  667         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  668                 if (p->fec_ifstat) {
  669                         ifmr->ifm_status |= IFM_ACTIVE;
  670                         break;
  671                 }
  672         }
  673 
  674         return;
  675 }
  676 
  677 /*
  678  * Process an ioctl for the virtual interface
  679  */
  680 static int
  681 ng_fec_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
  682 {
  683         struct ifreq *const ifr = (struct ifreq *) data;
  684         int s, error = 0;
  685         struct ng_fec_private   *priv;
  686         struct ng_fec_bundle    *b;
  687 
  688         priv = ifp->if_softc;
  689         b = &priv->fec_bundle;
  690 
  691 #ifdef DEBUG
  692         ng_fec_print_ioctl(ifp, command, data);
  693 #endif
  694         s = splimp();
  695         switch (command) {
  696 
  697         /* These two are mostly handled at a higher layer */
  698         case SIOCSIFADDR:
  699         case SIOCGIFADDR:
  700         case SIOCSIFMTU:
  701                 error = ether_ioctl(ifp, command, data);
  702                 break;
  703 
  704         /* Set flags */
  705         case SIOCSIFFLAGS:
  706                 /*
  707                  * If the interface is marked up and stopped, then start it.
  708                  * If it is marked down and running, then stop it.
  709                  */
  710                 if (ifr->ifr_flags & IFF_UP) {
  711                         if (!(ifp->if_flags & IFF_RUNNING)) {
  712                                 /* Sanity. */
  713                                 if (b->fec_ifcnt == 1 || b->fec_ifcnt == 3) {
  714                                         printf("fec%d: invalid bundle "
  715                                             "size: %d\n", priv->unit,
  716                                             b->fec_ifcnt);
  717                                         error = EINVAL;
  718                                         break;
  719                                 }
  720                                 ifp->if_flags &= ~(IFF_OACTIVE);
  721                                 ifp->if_flags |= IFF_RUNNING;
  722                                 ng_fec_init(priv);
  723                         }
  724                         /*
  725                          * Bubble down changes in promisc mode to
  726                          * underlying interfaces.
  727                          */
  728                         if ((ifp->if_flags & IFF_PROMISC) !=
  729                             (priv->if_flags & IFF_PROMISC)) {
  730                                 ng_fec_setport(ifp, command, data);
  731                                 priv->if_flags = ifp->if_flags;
  732                         }
  733                 } else {
  734                         if (ifp->if_flags & IFF_RUNNING)
  735                                 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
  736                         ng_fec_stop(ifp);
  737                 }
  738                 break;
  739 
  740         case SIOCADDMULTI:
  741         case SIOCDELMULTI:
  742                 ng_fec_setport(ifp, command, data);
  743                 error = 0;
  744                 break;
  745         case SIOCGIFMEDIA:
  746         case SIOCSIFMEDIA:
  747                 error = ifmedia_ioctl(ifp, ifr, &priv->ifmedia, command);
  748                 break;
  749         /* Stuff that's not supported */
  750         case SIOCSIFPHYS:
  751                 error = EOPNOTSUPP;
  752                 break;
  753 
  754         default:
  755                 error = EINVAL;
  756                 break;
  757         }
  758         (void) splx(s);
  759         return (error);
  760 }
  761 
  762 /*
  763  * This routine spies on mbufs received by underlying network device
  764  * drivers. When we add an interface to our bundle, we override its
  765  * if_input routine with a pointer to ng_fec_input(). This means we
  766  * get to look at all the device's packets before sending them to the
  767  * real ether_input() for processing by the stack. Once we verify the
  768  * packet comes from an interface that's been aggregated into
  769  * our bundle, we fix up the rcvif pointer and increment our
  770  * packet counters so that it looks like the frames are actually
  771  * coming from us.
  772  */
  773 static void 
  774 ng_fec_input(struct ifnet *ifp, struct mbuf *m0)
  775 {
  776         struct ng_node          *node;
  777         struct ng_fec_private   *priv;
  778         struct ng_fec_bundle    *b;
  779         struct ifnet            *bifp;
  780         struct ng_fec_portlist  *p;
  781 
  782         /* Sanity check */
  783         if (ifp == NULL || m0 == NULL)
  784                 return;
  785 
  786         node = IFP2NG(ifp);
  787 
  788         /* Sanity check part II */
  789         if (node == NULL)
  790                 return;
  791 
  792         priv = NG_NODE_PRIVATE(node);
  793         b = &priv->fec_bundle;
  794         bifp = &priv->arpcom.ac_if;
  795 
  796         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  797                 if (p->fec_if == m0->m_pkthdr.rcvif)
  798                         break;
  799         }
  800 
  801         /* Wasn't meant for us; leave this frame alone. */
  802         if (p == NULL)
  803                 return;
  804 
  805         /*
  806          * Check for a BPF tap on the underlying interface. This
  807          * is mainly a debugging aid: it allows tcpdump-ing of an
  808          * individual interface in a bundle to work, which it
  809          * otherwise would not. BPF tapping of our own aggregate
  810          * interface will occur once we call ether_input().
  811          */
  812         BPF_MTAP(m0->m_pkthdr.rcvif, m0);
  813 
  814         /* Convince the system that this is our frame. */
  815         m0->m_pkthdr.rcvif = bifp;
  816         bifp->if_ipackets++;
  817         bifp->if_ibytes += m0->m_pkthdr.len + sizeof(struct ether_header);
  818 
  819         (*bifp->if_input)(bifp, m0);
  820 
  821         return;
  822 }
  823 
  824 /*
  825  * Take a quick peek at the packet and see if it's ok for us to use
  826  * the inet or inet6 hash methods on it, if they're enabled. We do
  827  * this by setting flags in the mbuf header. Once we've made up our
  828  * mind what to do, we pass the frame to output vector for further
  829  * processing.
  830  */
  831 
  832 static int
  833 ng_fec_output(struct ifnet *ifp, struct mbuf *m,
  834                 struct sockaddr *dst, struct rtentry *rt0)
  835 {
  836         const priv_p priv = (priv_p) ifp->if_softc;
  837         struct ng_fec_bundle *b;
  838         int error;
  839 
  840         /* Check interface flags */
  841         if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
  842                 m_freem(m);
  843                 return (ENETDOWN);
  844         }
  845 
  846         b = &priv->fec_bundle;
  847 
  848         switch (b->fec_btype) {
  849         case FEC_BTYPE_MAC:
  850                 m->m_flags |= M_FEC_MAC;
  851                 break;
  852 #ifdef INET
  853         case FEC_BTYPE_INET:
  854                 /*
  855                  * We can't use the INET address port selection
  856                  * scheme if this isn't an INET packet.
  857                  */
  858                 if (dst->sa_family == AF_INET)
  859                         m->m_flags |= M_FEC_INET;
  860 #ifdef INET6
  861                 else if (dst->sa_family == AF_INET6)
  862                         m->m_flags |= M_FEC_INET6;
  863 #endif
  864                 else {
  865 #ifdef DEBUG
  866                         if_printf(ifp, "can't do inet aggregation of non "
  867                             "inet packet\n");
  868 #endif
  869                         m->m_flags |= M_FEC_MAC;
  870                 }
  871                 break;
  872 #endif
  873         default:
  874                 if_printf(ifp, "bogus hash type: %d\n",
  875                     b->fec_btype);
  876                 m_freem(m);
  877                 return(EINVAL);
  878                 break;
  879         }
  880 
  881         /*
  882          * Pass the frame to the output vector for all the protocol
  883          * handling. This will put the ethernet header on the packet
  884          * for us.
  885          */
  886         priv->if_error = 0;
  887         error = (*b->fec_if_output)(ifp, m, dst, rt0);
  888         if (priv->if_error && !error)
  889                 error = priv->if_error;
  890 
  891         return(error);
  892 }
  893 
  894 /*
  895  * Apply a hash to the source and destination addresses in the packet
  896  * in order to select an interface. Also check link status and handle
  897  * dead links accordingly.
  898  */
  899 
  900 static int
  901 ng_fec_choose_port(struct ng_fec_bundle *b,
  902         struct mbuf *m, struct ifnet **ifp)
  903 {
  904         struct ether_header     *eh;
  905         struct mbuf             *m0;
  906 #ifdef INET
  907         struct ip               *ip;
  908 #ifdef INET6
  909         struct ip6_hdr          *ip6;
  910 #endif
  911 #endif
  912 
  913         struct ng_fec_portlist  *p;
  914         int                     port = 0, mask;
  915 
  916         /*
  917          * If there are only two ports, mask off all but the
  918          * last bit for XORing. If there are 4, mask off all
  919          * but the last 2 bits.
  920          */
  921         mask = b->fec_ifcnt == 2 ? 0x1 : 0x3;
  922         eh = mtod(m, struct ether_header *);
  923 #ifdef INET
  924         ip = (struct ip *)(mtod(m, char *) +
  925             sizeof(struct ether_header));
  926 #ifdef INET6
  927         ip6 = (struct ip6_hdr *)(mtod(m, char *) +
  928             sizeof(struct ether_header));
  929 #endif
  930 #endif
  931 
  932         /*
  933          * The fg_fec_output() routine is supposed to leave a
  934          * flag for us in the mbuf that tells us what hash to
  935          * use, but sometimes a new mbuf is prepended to the
  936          * chain, so we have to search every mbuf in the chain
  937          * to find the flags.
  938          */
  939         m0 = m;
  940         while (m0) {
  941                 if (m0->m_flags & (M_FEC_MAC|M_FEC_INET|M_FEC_INET6))
  942                         break;
  943                 m0 = m0->m_next;
  944         }
  945         if (m0 == NULL)
  946                 return(EINVAL);
  947 
  948         switch (m0->m_flags & (M_FEC_MAC|M_FEC_INET|M_FEC_INET6)) {
  949         case M_FEC_MAC:
  950                 port = (eh->ether_dhost[5] ^
  951                     eh->ether_shost[5]) & mask;
  952                 break;
  953 #ifdef INET
  954         case M_FEC_INET:
  955                 port = (ntohl(ip->ip_dst.s_addr) ^
  956                     ntohl(ip->ip_src.s_addr)) & mask;
  957                 break;
  958 #ifdef INET6
  959         case M_FEC_INET6:
  960                 port = (ip6->ip6_dst.s6_addr[15] ^
  961                     ip6->ip6_dst.s6_addr[15]) & mask;
  962                 break;
  963 #endif
  964 #endif
  965         default:
  966                 return(EINVAL);
  967                         break;
  968         }
  969 
  970         TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
  971                 if (port == p->fec_idx)
  972                         break;
  973         }
  974 
  975         /*
  976          * Now that we've chosen a port, make sure it's
  977          * alive. If it's not alive, cycle through the bundle
  978          * looking for a port that is alive. If we don't find
  979          * any, return an error.
  980          */
  981         if (p->fec_ifstat != 1) {
  982                 struct ng_fec_portlist  *n = NULL;
  983 
  984                 n = TAILQ_NEXT(p, fec_list);
  985                 if (n == NULL)
  986                         n = TAILQ_FIRST(&b->ng_fec_ports);
  987                 while (n != p) {
  988                         if (n->fec_ifstat == 1)
  989                                 break;
  990                         n = TAILQ_NEXT(n, fec_list);
  991                         if (n == NULL)
  992                                 n = TAILQ_FIRST(&b->ng_fec_ports);
  993                 }
  994                 if (n == p)
  995                         return(EAGAIN);
  996                 p = n;
  997         }
  998 
  999         *ifp = p->fec_if;
 1000 
 1001         return(0);
 1002 }
 1003 
 1004 /*
 1005  * Now that the packet has been run through ether_output(), yank it
 1006  * off our own send queue and stick it on the queue for the appropriate
 1007  * underlying physical interface. Note that if the interface's send
 1008  * queue is full, we save an error status in our private netgraph
 1009  * space which will eventually be handed up to ng_fec_output(), which
 1010  * will return it to the rest of the IP stack. We need to do this
 1011  * in order to duplicate the effect of ether_output() returning ENOBUFS
 1012  * when it detects that an interface's send queue is full. There's no
 1013  * other way to signal the error status from here since the if_start()
 1014  * routine is spec'ed to return void.
 1015  *
 1016  * Once the frame is queued, we call ether_output_frame() to initiate
 1017  * transmission.
 1018  */
 1019 static void
 1020 ng_fec_start(struct ifnet *ifp)
 1021 {
 1022         struct ng_fec_private   *priv;
 1023         struct ng_fec_bundle    *b;
 1024         struct ifnet            *oifp = NULL;
 1025         struct mbuf             *m0;
 1026         int                     error;
 1027 
 1028         priv = ifp->if_softc;
 1029         b = &priv->fec_bundle;
 1030 
 1031         IF_DEQUEUE(&ifp->if_snd, m0);
 1032         if (m0 == NULL)
 1033                 return;
 1034 
 1035         BPF_MTAP(ifp, m0);
 1036 
 1037         /* Queue up packet on the proper port. */
 1038         error = ng_fec_choose_port(b, m0, &oifp);
 1039         if (error) {
 1040                 ifp->if_ierrors++;
 1041                 m_freem(m0);
 1042                 priv->if_error = ENOBUFS;
 1043                 return;
 1044         }
 1045         ifp->if_opackets++;
 1046 
 1047         priv->if_error = IF_HANDOFF(&oifp->if_snd, m0, oifp) ? 0 : ENOBUFS;
 1048 
 1049         return;
 1050 }
 1051 
 1052 #ifdef DEBUG
 1053 /*
 1054  * Display an ioctl to the virtual interface
 1055  */
 1056 
 1057 static void
 1058 ng_fec_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
 1059 {
 1060         char   *str;
 1061 
 1062         switch (command & IOC_DIRMASK) {
 1063         case IOC_VOID:
 1064                 str = "IO";
 1065                 break;
 1066         case IOC_OUT:
 1067                 str = "IOR";
 1068                 break;
 1069         case IOC_IN:
 1070                 str = "IOW";
 1071                 break;
 1072         case IOC_INOUT:
 1073                 str = "IORW";
 1074                 break;
 1075         default:
 1076                 str = "IO??";
 1077         }
 1078         log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
 1079                ifp->if_xname,
 1080                str,
 1081                IOCGROUP(command),
 1082                command & 0xff,
 1083                IOCPARM_LEN(command));
 1084 }
 1085 #endif /* DEBUG */
 1086 
 1087 /************************************************************************
 1088                         NETGRAPH NODE STUFF
 1089  ************************************************************************/
 1090 
 1091 /*
 1092  * Constructor for a node
 1093  */
 1094 static int
 1095 ng_fec_constructor(node_p node)
 1096 {
 1097         char ifname[NG_FEC_FEC_NAME_MAX + 1];
 1098         struct ifnet *ifp;
 1099         priv_p priv;
 1100         struct ng_fec_bundle *b;
 1101         int error = 0;
 1102 
 1103         /* Allocate node and interface private structures */
 1104         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT);
 1105         if (priv == NULL)
 1106                 return (ENOMEM);
 1107         bzero(priv, sizeof(*priv));
 1108 
 1109         ifp = &priv->arpcom.ac_if;
 1110         b = &priv->fec_bundle;
 1111 
 1112         /* Link them together */
 1113         ifp->if_softc = priv;
 1114 
 1115         /* Get an interface unit number */
 1116         if ((error = ng_fec_get_unit(&priv->unit)) != 0) {
 1117                 FREE(ifp, M_NETGRAPH);
 1118                 FREE(priv, M_NETGRAPH);
 1119                 return (error);
 1120         }
 1121 
 1122         /* Link together node and private info */
 1123         NG_NODE_SET_PRIVATE(node, priv);
 1124         priv->node = node;
 1125 
 1126         /* Initialize interface structure */
 1127         if_initname(ifp, NG_FEC_FEC_NAME, priv->unit);
 1128         ifp->if_start = ng_fec_start;
 1129         ifp->if_ioctl = ng_fec_ioctl;
 1130         ifp->if_init = ng_fec_init;
 1131         ifp->if_watchdog = NULL;
 1132         ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
 1133         ifp->if_mtu = NG_FEC_MTU_DEFAULT;
 1134         ifp->if_flags = (IFF_SIMPLEX|IFF_BROADCAST|IFF_MULTICAST);
 1135         ifp->if_type = IFT_PROPVIRTUAL;         /* XXX */
 1136         ifp->if_addrlen = 0;                    /* XXX */
 1137         ifp->if_hdrlen = 0;                     /* XXX */
 1138         ifp->if_baudrate = 100000000;           /* XXX */
 1139         TAILQ_INIT(&ifp->if_addrhead); /* XXX useless - done in if_attach */
 1140 
 1141         /* Give this node the same name as the interface (if possible) */
 1142         bzero(ifname, sizeof(ifname));
 1143         strlcpy(ifname, ifp->if_xname, sizeof(ifname));
 1144         if (ng_name_node(node, ifname) != 0)
 1145                 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname);
 1146 
 1147         /* Attach the interface */
 1148         ether_ifattach(ifp, priv->arpcom.ac_enaddr);
 1149         callout_handle_init(&priv->fec_ch);
 1150 
 1151         /* Override output method with our own */
 1152         ifp->if_output = ng_fec_output;
 1153 
 1154         TAILQ_INIT(&b->ng_fec_ports);
 1155         b->fec_ifcnt = 0;
 1156 
 1157         ifmedia_init(&priv->ifmedia, 0,
 1158             ng_fec_ifmedia_upd, ng_fec_ifmedia_sts);
 1159         ifmedia_add(&priv->ifmedia, IFM_ETHER|IFM_NONE, 0, NULL);
 1160         ifmedia_set(&priv->ifmedia, IFM_ETHER|IFM_NONE);
 1161 
 1162         /* Done */
 1163         return (0);
 1164 }
 1165 
 1166 /*
 1167  * Receive a control message
 1168  */
 1169 static int
 1170 ng_fec_rcvmsg(node_p node, item_p item, hook_p lasthook)
 1171 {
 1172         const priv_p priv = NG_NODE_PRIVATE(node);
 1173         struct ng_fec_bundle    *b;
 1174         struct ng_mesg *resp = NULL;
 1175         struct ng_mesg *msg;
 1176         char *ifname;
 1177         int error = 0;
 1178 
 1179         NGI_GET_MSG(item, msg);
 1180         b = &priv->fec_bundle;
 1181 
 1182         switch (msg->header.typecookie) {
 1183         case NGM_FEC_COOKIE:
 1184                 switch (msg->header.cmd) {
 1185                 case NGM_FEC_ADD_IFACE:
 1186                         ifname = msg->data;
 1187                         error = ng_fec_addport(priv, ifname);
 1188                         break;
 1189                 case NGM_FEC_DEL_IFACE:
 1190                         ifname = msg->data;
 1191                         error = ng_fec_delport(priv, ifname);
 1192                         break;
 1193                 case NGM_FEC_SET_MODE_MAC:
 1194                         b->fec_btype = FEC_BTYPE_MAC;
 1195                         break;
 1196 #ifdef INET
 1197                 case NGM_FEC_SET_MODE_INET:
 1198                         b->fec_btype = FEC_BTYPE_INET;
 1199                         break;
 1200 #ifdef INET6
 1201                 case NGM_FEC_SET_MODE_INET6:
 1202                         b->fec_btype = FEC_BTYPE_INET6;
 1203                         break;
 1204 #endif
 1205 #endif
 1206                 default:
 1207                         error = EINVAL;
 1208                         break;
 1209                 }
 1210                 break;
 1211         default:
 1212                 error = EINVAL;
 1213                 break;
 1214         }
 1215         NG_RESPOND_MSG(error, node, item, resp);
 1216         NG_FREE_MSG(msg);
 1217         return (error);
 1218 }
 1219 
 1220 /*
 1221  * Shutdown and remove the node and its associated interface.
 1222  */
 1223 static int
 1224 ng_fec_shutdown(node_p node)
 1225 {
 1226         const priv_p priv = NG_NODE_PRIVATE(node);
 1227         struct ng_fec_bundle *b;
 1228         struct ng_fec_portlist  *p;
 1229 
 1230         b = &priv->fec_bundle;
 1231         ng_fec_stop(&priv->arpcom.ac_if);
 1232 
 1233         while (!TAILQ_EMPTY(&b->ng_fec_ports)) {
 1234                 p = TAILQ_FIRST(&b->ng_fec_ports);
 1235                 ng_fec_delport(priv, p->fec_if->if_xname);
 1236         }
 1237 
 1238         ether_ifdetach(&priv->arpcom.ac_if);
 1239         ifmedia_removeall(&priv->ifmedia);
 1240         ng_fec_free_unit(priv->unit);
 1241         FREE(priv, M_NETGRAPH);
 1242         NG_NODE_SET_PRIVATE(node, NULL);
 1243         NG_NODE_UNREF(node);
 1244         return (0);
 1245 }

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