4 * Copyright (c) 2001 Berkeley Software Design, Inc.
5 * Copyright (c) 2000, 2001
6 * Bill Paul <wpaul@osd.bsdi.com>. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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.
35 * $FreeBSD: src/sys/netgraph/ng_fec.c,v 1.1.2.1 2002/11/01 21:39:31 julian Exp $
36 * $DragonFly: src/sys/netgraph/fec/ng_fec.c,v 1.3 2003/08/07 21:17:31 dillon Exp $
39 * Copyright (c) 1996-1999 Whistle Communications, Inc.
40 * All rights reserved.
42 * Subject to the following obligations and disclaimer of warranty, use and
43 * redistribution of this software, in source or object code forms, with or
44 * without modifications are expressly permitted by Whistle Communications;
45 * provided, however, that:
46 * 1. Any and all reproductions of the source or object code must include the
47 * copyright notice above and the following disclaimer of warranties; and
48 * 2. No rights are granted, in any manner or form, to use Whistle
49 * Communications, Inc. trademarks, including the mark "WHISTLE
50 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
51 * such appears in the above copyright notice or in the software.
53 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
54 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
55 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
56 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
57 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
58 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
59 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
60 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
61 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
62 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
63 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
64 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
65 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
66 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
67 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
68 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
71 * Author: Archie Cobbs <archie@freebsd.org>
73 * $Whistle: ng_fec.c,v 1.33 1999/11/01 09:24:51 julian Exp $
77 * This module implements ethernet channel bonding using the Cisco
78 * Fast EtherChannel mechanism. Two or four ports may be combined
79 * into a single aggregate interface.
81 * Interfaces are named fec0, fec1, etc. New nodes take the
82 * first available interface name.
84 * This node also includes Berkeley packet filter support.
86 * Note that this node doesn't need to connect to any other
87 * netgraph nodes in order to do its work.
90 #include <sys/param.h>
91 #include <sys/systm.h>
92 #include <sys/errno.h>
93 #include <sys/kernel.h>
94 #include <sys/malloc.h>
96 #include <sys/errno.h>
97 #include <sys/sockio.h>
98 #include <sys/socket.h>
99 #include <sys/syslog.h>
100 #include <sys/libkern.h>
101 #include <sys/queue.h>
104 #include <net/if_types.h>
105 #include <net/if_arp.h>
106 #include <net/if_dl.h>
107 #include <net/if_media.h>
108 #include <net/intrq.h>
110 #include <net/ethernet.h>
112 #include "opt_inet.h"
113 #include "opt_inet6.h"
115 #include <netinet/in.h>
117 #include <netinet/in_systm.h>
118 #include <netinet/ip.h>
122 #include <netinet/ip6.h>
125 #include <netgraph/ng_message.h>
126 #include <netgraph/netgraph.h>
127 #include <netgraph/ng_parse.h>
130 #define IFP2NG(ifp) ((struct ng_node *)((struct arpcom *)(ifp))->ac_netgraph)
131 #define FEC_INC(x, y) (x) = (x + 1) % y
134 * Current fast etherchannel implementations use either 2 or 4
135 * ports, so for now we limit the maximum bundle size to 4 interfaces.
137 #define FEC_BUNDLESIZ 4
139 struct ng_fec_portlist {
140 struct ifnet *fec_if;
143 struct ether_addr fec_mac;
144 TAILQ_ENTRY(ng_fec_portlist) fec_list;
147 struct ng_fec_bundle {
148 TAILQ_HEAD(,ng_fec_portlist) ng_fec_ports;
153 #define FEC_BTYPE_MAC 0x01
154 #define FEC_BTYPE_INET 0x02
155 #define FEC_BTYPE_INET6 0x03
157 /* Node private data */
158 struct ng_fec_private {
159 struct arpcom arpcom;
160 struct ifmedia ifmedia;
162 int if_error; /* XXX */
163 int unit; /* Interface unit number */
164 node_p node; /* Our netgraph node */
165 struct ng_fec_bundle fec_bundle;/* Aggregate bundle */
166 struct callout_handle fec_ch; /* callout handle for ticker */
168 typedef struct ng_fec_private *priv_p;
170 /* Interface methods */
171 static void ng_fec_input(struct ifnet *, struct mbuf **,
172 struct ether_header *);
173 static void ng_fec_start(struct ifnet *ifp);
174 static int ng_fec_choose_port(struct ng_fec_bundle *b,
175 struct mbuf *m, struct ifnet **ifp);
176 static int ng_fec_setport(struct ifnet *ifp, u_long cmd, caddr_t data);
177 static void ng_fec_init(void *arg);
178 static void ng_fec_stop(struct ifnet *ifp);
179 static int ng_fec_ifmedia_upd(struct ifnet *ifp);
180 static void ng_fec_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr);
181 static int ng_fec_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
182 static int ng_fec_output(struct ifnet *ifp, struct mbuf *m0,
183 struct sockaddr *dst, struct rtentry *rt0);
184 static void ng_fec_tick(void *arg);
185 static int ng_fec_addport(struct ng_fec_private *priv, char *iface);
186 static int ng_fec_delport(struct ng_fec_private *priv, char *iface);
189 static void ng_fec_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
192 /* Netgraph methods */
193 static ng_constructor_t ng_fec_constructor;
194 static ng_rcvmsg_t ng_fec_rcvmsg;
195 static ng_shutdown_t ng_fec_rmnode;
197 /* List of commands and how to convert arguments to/from ASCII */
198 static const struct ng_cmdlist ng_fec_cmds[] = {
203 &ng_parse_string_type,
210 &ng_parse_string_type,
215 NGM_FEC_SET_MODE_MAC,
222 NGM_FEC_SET_MODE_INET,
230 /* Node type descriptor */
231 static struct ng_type typestruct = {
246 NETGRAPH_INIT(fec, &typestruct);
248 /* We keep a bitmap indicating which unit numbers are free.
249 One means the unit number is free, zero means it's taken. */
250 static int *ng_fec_units = NULL;
251 static int ng_fec_units_len = 0;
252 static int ng_units_in_use = 0;
254 #define UNITS_BITSPERWORD (sizeof(*ng_fec_units) * NBBY)
257 * Find the first free unit number for a new interface.
258 * Increase the size of the unit bitmap as necessary.
260 static __inline__ int
261 ng_fec_get_unit(int *unit)
265 for (index = 0; index < ng_fec_units_len
266 && ng_fec_units[index] == 0; index++);
267 if (index == ng_fec_units_len) { /* extend array */
268 int i, *newarray, newlen;
270 newlen = (2 * ng_fec_units_len) + 4;
271 MALLOC(newarray, int *, newlen * sizeof(*ng_fec_units),
272 M_NETGRAPH, M_NOWAIT);
273 if (newarray == NULL)
275 bcopy(ng_fec_units, newarray,
276 ng_fec_units_len * sizeof(*ng_fec_units));
277 for (i = ng_fec_units_len; i < newlen; i++)
279 if (ng_fec_units != NULL)
280 FREE(ng_fec_units, M_NETGRAPH);
281 ng_fec_units = newarray;
282 ng_fec_units_len = newlen;
284 bit = ffs(ng_fec_units[index]) - 1;
285 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1,
286 ("%s: word=%d bit=%d", __FUNCTION__, ng_fec_units[index], bit));
287 ng_fec_units[index] &= ~(1 << bit);
288 *unit = (index * UNITS_BITSPERWORD) + bit;
294 * Free a no longer needed unit number.
296 static __inline__ void
297 ng_fec_free_unit(int unit)
301 index = unit / UNITS_BITSPERWORD;
302 bit = unit % UNITS_BITSPERWORD;
303 KASSERT(index < ng_fec_units_len,
304 ("%s: unit=%d len=%d", __FUNCTION__, unit, ng_fec_units_len));
305 KASSERT((ng_fec_units[index] & (1 << bit)) == 0,
306 ("%s: unit=%d is free", __FUNCTION__, unit));
307 ng_fec_units[index] |= (1 << bit);
309 * XXX We could think about reducing the size of ng_fec_units[]
310 * XXX here if the last portion is all ones
311 * XXX At least free it if no more units.
312 * Needed if we are eventually be able to unload.
315 if (ng_units_in_use == 0) { /* XXX make SMP safe */
316 FREE(ng_fec_units, M_NETGRAPH);
317 ng_fec_units_len = 0;
322 /************************************************************************
324 ************************************************************************/
327 ng_fec_addport(struct ng_fec_private *priv, char *iface)
329 struct ng_fec_bundle *b;
330 struct ifnet *ifp, *bifp;
333 struct sockaddr_dl *sdl;
334 struct ng_fec_portlist *p, *new;
336 if (priv == NULL || iface == NULL)
339 b = &priv->fec_bundle;
340 ifp = &priv->arpcom.ac_if;
342 /* Find the interface */
343 bifp = ifunit(iface);
345 printf("fec%d: tried to add iface %s, which "
346 "doesn't seem to exist\n", priv->unit, iface);
350 /* See if we have room in the bundle */
351 if (b->fec_ifcnt == FEC_BUNDLESIZ) {
352 printf("fec%d: can't add new iface; bundle is full\n",
357 /* See if the interface is already in the bundle */
358 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
359 if (p->fec_if == bifp) {
360 printf("fec%d: iface %s is already in this "
361 "bundle\n", priv->unit, iface);
366 /* Allocate new list entry. */
367 MALLOC(new, struct ng_fec_portlist *,
368 sizeof(struct ng_fec_portlist), M_NETGRAPH, M_NOWAIT);
372 ac = (struct arpcom *)bifp;
373 ac->ac_netgraph = priv->node;
376 * If this is the first interface added to the bundle,
377 * use its MAC address for the virtual interface (and,
378 * by extension, all the other ports in the bundle).
380 if (b->fec_ifcnt == 0) {
381 ifa = ifnet_addrs[ifp->if_index - 1];
382 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
383 bcopy((char *)ac->ac_enaddr,
384 priv->arpcom.ac_enaddr, ETHER_ADDR_LEN);
385 bcopy((char *)ac->ac_enaddr,
386 LLADDR(sdl), ETHER_ADDR_LEN);
389 b->fec_btype = FEC_BTYPE_MAC;
390 new->fec_idx = b->fec_ifcnt;
393 /* Save the real MAC address. */
394 bcopy((char *)ac->ac_enaddr,
395 (char *)&new->fec_mac, ETHER_ADDR_LEN);
397 /* Set up phony MAC address. */
398 ifa = ifnet_addrs[bifp->if_index - 1];
399 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
400 bcopy(priv->arpcom.ac_enaddr, ac->ac_enaddr, ETHER_ADDR_LEN);
401 bcopy(priv->arpcom.ac_enaddr, LLADDR(sdl), ETHER_ADDR_LEN);
403 /* Add to the queue */
405 TAILQ_INSERT_TAIL(&b->ng_fec_ports, new, fec_list);
411 ng_fec_delport(struct ng_fec_private *priv, char *iface)
413 struct ng_fec_bundle *b;
414 struct ifnet *ifp, *bifp;
417 struct sockaddr_dl *sdl;
418 struct ng_fec_portlist *p;
420 if (priv == NULL || iface == NULL)
423 b = &priv->fec_bundle;
424 ifp = &priv->arpcom.ac_if;
426 /* Find the interface */
427 bifp = ifunit(iface);
429 printf("fec%d: tried to remove iface %s, which "
430 "doesn't seem to exist\n", priv->unit, iface);
434 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
435 if (p->fec_if == bifp)
440 printf("fec%d: tried to remove iface %s which "
441 "is not in our bundle\n", priv->unit, iface);
446 bifp->if_flags &= ~IFF_UP;
447 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
449 /* Restore MAC address. */
450 ac = (struct arpcom *)bifp;
451 ifa = ifnet_addrs[bifp->if_index - 1];
452 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
453 bcopy((char *)&p->fec_mac, ac->ac_enaddr, ETHER_ADDR_LEN);
454 bcopy((char *)&p->fec_mac, LLADDR(sdl), ETHER_ADDR_LEN);
457 TAILQ_REMOVE(&b->ng_fec_ports, p, fec_list);
465 * Pass an ioctl command down to all the underyling interfaces in a
466 * bundle. Used for setting multicast filters and flags.
470 ng_fec_setport(struct ifnet *ifp, u_long command, caddr_t data)
472 struct ng_fec_private *priv;
473 struct ng_fec_bundle *b;
475 struct ng_fec_portlist *p;
477 priv = ifp->if_softc;
478 b = &priv->fec_bundle;
480 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
483 (*oifp->if_ioctl)(oifp, command, data);
490 ng_fec_init(void *arg)
492 struct ng_fec_private *priv;
493 struct ng_fec_bundle *b;
494 struct ifnet *ifp, *bifp;
495 struct ng_fec_portlist *p;
498 priv = ifp->if_softc;
499 b = &priv->fec_bundle;
501 if (b->fec_ifcnt == 1 || b->fec_ifcnt == 3) {
502 printf("fec%d: invalid bundle "
503 "size: %d\n", priv->unit,
510 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
512 bifp->if_flags |= IFF_UP;
513 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
514 /* mark iface as up and let the monitor check it */
518 priv->fec_ch = timeout(ng_fec_tick, priv, hz);
524 ng_fec_stop(struct ifnet *ifp)
526 struct ng_fec_private *priv;
527 struct ng_fec_bundle *b;
529 struct ng_fec_portlist *p;
531 priv = ifp->if_softc;
532 b = &priv->fec_bundle;
534 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
536 bifp->if_flags &= ~IFF_UP;
537 (*bifp->if_ioctl)(bifp, SIOCSIFFLAGS, NULL);
540 untimeout(ng_fec_tick, priv, priv->fec_ch);
546 ng_fec_tick(void *arg)
548 struct ng_fec_private *priv;
549 struct ng_fec_bundle *b;
550 struct ifmediareq ifmr;
552 struct ng_fec_portlist *p;
556 b = &priv->fec_bundle;
558 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
559 bzero((char *)&ifmr, sizeof(ifmr));
561 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr);
563 printf("fec%d: failed to check status "
564 "of link %s%d\n", priv->unit, ifp->if_name,
569 if (ifmr.ifm_status & IFM_AVALID &&
570 IFM_TYPE(ifmr.ifm_active) == IFM_ETHER) {
571 if (ifmr.ifm_status & IFM_ACTIVE) {
572 if (p->fec_ifstat == -1 ||
573 p->fec_ifstat == 0) {
575 printf("fec%d: port %s%d in bundle "
576 "is up\n", priv->unit,
577 ifp->if_name, ifp->if_unit);
580 if (p->fec_ifstat == -1 ||
581 p->fec_ifstat == 1) {
583 printf("fec%d: port %s%d in bundle "
584 "is down\n", priv->unit,
585 ifp->if_name, ifp->if_unit);
591 ifp = &priv->arpcom.ac_if;
592 if (ifp->if_flags & IFF_RUNNING)
593 priv->fec_ch = timeout(ng_fec_tick, priv, hz);
599 ng_fec_ifmedia_upd(struct ifnet *ifp)
604 static void ng_fec_ifmedia_sts(struct ifnet *ifp,
605 struct ifmediareq *ifmr)
607 struct ng_fec_private *priv;
608 struct ng_fec_bundle *b;
609 struct ng_fec_portlist *p;
611 priv = ifp->if_softc;
612 b = &priv->fec_bundle;
614 ifmr->ifm_status = IFM_AVALID;
615 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
617 ifmr->ifm_status |= IFM_ACTIVE;
626 * Process an ioctl for the virtual interface
629 ng_fec_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
631 struct ifreq *const ifr = (struct ifreq *) data;
633 struct ng_fec_private *priv;
634 struct ng_fec_bundle *b;
636 priv = ifp->if_softc;
637 b = &priv->fec_bundle;
640 ng_fec_print_ioctl(ifp, command, data);
645 /* These two are mostly handled at a higher layer */
649 error = ether_ioctl(ifp, command, data);
655 * If the interface is marked up and stopped, then start it.
656 * If it is marked down and running, then stop it.
658 if (ifr->ifr_flags & IFF_UP) {
659 if (!(ifp->if_flags & IFF_RUNNING)) {
661 if (b->fec_ifcnt == 1 || b->fec_ifcnt == 3) {
662 printf("fec%d: invalid bundle "
663 "size: %d\n", priv->unit,
668 ifp->if_flags &= ~(IFF_OACTIVE);
669 ifp->if_flags |= IFF_RUNNING;
673 * Bubble down changes in promisc mode to
674 * underlying interfaces.
676 if ((ifp->if_flags & IFF_PROMISC) !=
677 (priv->if_flags & IFF_PROMISC)) {
678 ng_fec_setport(ifp, command, data);
679 priv->if_flags = ifp->if_flags;
682 if (ifp->if_flags & IFF_RUNNING)
683 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
690 ng_fec_setport(ifp, command, data);
695 error = ifmedia_ioctl(ifp, ifr, &priv->ifmedia, command);
697 /* Stuff that's not supported */
711 * This routine spies on mbufs passing through ether_input(). If
712 * they come from one of the interfaces that are aggregated into
713 * our bundle, we fix up the ifnet pointer and increment our
714 * packet counters so that it looks like the frames are actually
718 ng_fec_input(struct ifnet *ifp, struct mbuf **m0,
719 struct ether_header *eh)
721 struct ng_node *node;
722 struct ng_fec_private *priv;
723 struct ng_fec_bundle *b;
726 struct ng_fec_portlist *p;
729 if (ifp == NULL || m0 == NULL || eh == NULL)
734 /* Sanity check part II */
738 priv = node->private;
739 b = &priv->fec_bundle;
740 bifp = &priv->arpcom.ac_if;
743 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
744 if (p->fec_if == m->m_pkthdr.rcvif)
748 /* Wasn't meant for us; leave this frame alone. */
752 /* Pretend this is our frame. */
753 m->m_pkthdr.rcvif = bifp;
755 bifp->if_ibytes += m->m_pkthdr.len + sizeof(struct ether_header);
757 /* Check for a BPF tap */
758 if (bifp->if_bpf != NULL) {
761 /* This kludge is OK; BPF treats the "mbuf" as read-only */
763 mh.mh_data = (char *)eh;
764 mh.mh_len = ETHER_HDR_LEN;
765 bpf_mtap(bifp, (struct mbuf *)&mh);
772 * Take a quick peek at the packet and see if it's ok for us to use
773 * the inet or inet6 hash methods on it, if they're enabled. We do
774 * this by setting flags in the mbuf header. Once we've made up our
775 * mind what to do, we pass the frame to ether_output() for further
780 ng_fec_output(struct ifnet *ifp, struct mbuf *m,
781 struct sockaddr *dst, struct rtentry *rt0)
783 const priv_p priv = (priv_p) ifp->if_softc;
784 struct ng_fec_bundle *b;
787 /* Check interface flags */
788 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
793 b = &priv->fec_bundle;
795 switch (b->fec_btype) {
797 m->m_flags |= M_FEC_MAC;
802 * We can't use the INET address port selection
803 * scheme if this isn't an INET packet.
805 if (dst->sa_family == AF_INET)
806 m->m_flags |= M_FEC_INET;
808 else if (dst->sa_family == AF_INET6)
809 m->m_flags |= M_FEC_INET6;
813 printf("fec%d: can't do inet aggregation of non "
814 "inet packet\n", ifp->if_unit);
816 m->m_flags |= M_FEC_MAC;
821 printf("fec%d: bogus hash type: %d\n", ifp->if_unit,
829 * Pass the frame to ether_output() for all the protocol
830 * handling. This will put the ethernet header on the packet
834 error = ether_output(ifp, m, dst, rt0);
835 if (priv->if_error && !error)
836 error = priv->if_error;
842 * Apply a hash to the source and destination addresses in the packet
843 * in order to select an interface. Also check link status and handle
844 * dead links accordingly.
848 ng_fec_choose_port(struct ng_fec_bundle *b,
849 struct mbuf *m, struct ifnet **ifp)
851 struct ether_header *eh;
860 struct ng_fec_portlist *p;
864 * If there are only two ports, mask off all but the
865 * last bit for XORing. If there are 4, mask off all
866 * but the last 2 bits.
868 mask = b->fec_ifcnt == 2 ? 0x1 : 0x3;
869 eh = mtod(m, struct ether_header *);
871 ip = (struct ip *)(mtod(m, char *) +
872 sizeof(struct ether_header));
874 ip6 = (struct ip6_hdr *)(mtod(m, char *) +
875 sizeof(struct ether_header));
880 * The fg_fec_output() routine is supposed to leave a
881 * flag for us in the mbuf that tells us what hash to
882 * use, but sometimes a new mbuf is prepended to the
883 * chain, so we have to search every mbuf in the chain
888 if (m0->m_flags & (M_FEC_MAC|M_FEC_INET|M_FEC_INET6))
895 switch (m0->m_flags & (M_FEC_MAC|M_FEC_INET|M_FEC_INET6)) {
897 port = (eh->ether_dhost[5] ^
898 eh->ether_shost[5]) & mask;
902 port = (ntohl(ip->ip_dst.s_addr) ^
903 ntohl(ip->ip_src.s_addr)) & mask;
907 port = (ip6->ip6_dst.s6_addr[15] ^
908 ip6->ip6_dst.s6_addr[15]) & mask;
917 TAILQ_FOREACH(p, &b->ng_fec_ports, fec_list) {
918 if (port == p->fec_idx)
923 * Now that we've chosen a port, make sure it's
924 * alive. If it's not alive, cycle through the bundle
925 * looking for a port that is alive. If we don't find
926 * any, return an error.
928 if (p->fec_ifstat != 1) {
929 struct ng_fec_portlist *n = NULL;
931 n = TAILQ_NEXT(p, fec_list);
933 n = TAILQ_FIRST(&b->ng_fec_ports);
935 if (n->fec_ifstat == 1)
937 n = TAILQ_NEXT(n, fec_list);
939 n = TAILQ_FIRST(&b->ng_fec_ports);
952 * Now that the packet has been run through ether_output(), yank it
953 * off our own send queue and stick it on the queue for the appropriate
954 * underlying physical interface. Note that if the interface's send
955 * queue is full, we save an error status in our private netgraph
956 * space which will eventually be handed up to ng_fec_output(), which
957 * will return it to the rest of the IP stack. We need to do this
958 * in order to duplicate the effect of ether_output() returning ENOBUFS
959 * when it detects that an interface's send queue is full. There's no
960 * other way to signal the error status from here since the if_start()
961 * routine is spec'ed to return void.
963 * Once the frame is queued, we call ether_output_frame() to initiate
967 ng_fec_start(struct ifnet *ifp)
969 struct ng_fec_private *priv;
970 struct ng_fec_bundle *b;
971 struct ifnet *oifp = NULL;
975 priv = ifp->if_softc;
976 b = &priv->fec_bundle;
978 IF_DEQUEUE(&ifp->if_snd, m0);
985 /* Queue up packet on the proper port. */
986 error = ng_fec_choose_port(b, m0, &oifp);
990 priv->if_error = ENOBUFS;
995 priv->if_error = ether_output_frame(oifp, m0);
1001 * Display an ioctl to the virtual interface
1005 ng_fec_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
1009 switch (command & IOC_DIRMASK) {
1025 log(LOG_DEBUG, "%s%d: %s('%c', %d, char[%d])\n",
1026 ifp->if_name, ifp->if_unit,
1030 IOCPARM_LEN(command));
1034 /************************************************************************
1036 ************************************************************************/
1039 * Constructor for a node
1042 ng_fec_constructor(node_p *nodep)
1044 char ifname[NG_FEC_FEC_NAME_MAX + 1];
1048 struct ng_fec_bundle *b;
1051 /* Allocate node and interface private structures */
1052 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT);
1055 bzero(priv, sizeof(*priv));
1057 ifp = &priv->arpcom.ac_if;
1058 b = &priv->fec_bundle;
1060 /* Link them together */
1061 ifp->if_softc = priv;
1063 /* Get an interface unit number */
1064 if ((error = ng_fec_get_unit(&priv->unit)) != 0) {
1065 FREE(ifp, M_NETGRAPH);
1066 FREE(priv, M_NETGRAPH);
1070 /* Call generic node constructor */
1071 if ((error = ng_make_node_common(&typestruct, nodep)) != 0) {
1072 ng_fec_free_unit(priv->unit);
1073 FREE(ifp, M_NETGRAPH);
1074 FREE(priv, M_NETGRAPH);
1079 /* Link together node and private info */
1080 node->private = priv;
1082 priv->arpcom.ac_netgraph = node;
1084 /* Initialize interface structure */
1085 ifp->if_name = NG_FEC_FEC_NAME;
1086 ifp->if_unit = priv->unit;
1087 ifp->if_output = ng_fec_output;
1088 ifp->if_start = ng_fec_start;
1089 ifp->if_ioctl = ng_fec_ioctl;
1090 ifp->if_init = ng_fec_init;
1091 ifp->if_watchdog = NULL;
1092 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
1093 ifp->if_mtu = NG_FEC_MTU_DEFAULT;
1094 ifp->if_flags = (IFF_SIMPLEX|IFF_BROADCAST|IFF_MULTICAST);
1095 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */
1096 ifp->if_addrlen = 0; /* XXX */
1097 ifp->if_hdrlen = 0; /* XXX */
1098 ifp->if_baudrate = 100000000; /* XXX */
1099 TAILQ_INIT(&ifp->if_addrhead);
1101 /* Give this node the same name as the interface (if possible) */
1102 bzero(ifname, sizeof(ifname));
1103 snprintf(ifname, sizeof(ifname), "%s%d", ifp->if_name, ifp->if_unit);
1104 if (ng_name_node(node, ifname) != 0)
1105 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname);
1107 /* Grab hold of the ether_input pipe. */
1108 if (ng_ether_input_p == NULL)
1109 ng_ether_input_p = ng_fec_input;
1111 /* Attach the interface */
1112 ether_ifattach(ifp, ETHER_BPF_SUPPORTED);
1113 callout_handle_init(&priv->fec_ch);
1115 TAILQ_INIT(&b->ng_fec_ports);
1118 ifmedia_init(&priv->ifmedia, 0,
1119 ng_fec_ifmedia_upd, ng_fec_ifmedia_sts);
1120 ifmedia_add(&priv->ifmedia, IFM_ETHER|IFM_NONE, 0, NULL);
1121 ifmedia_set(&priv->ifmedia, IFM_ETHER|IFM_NONE);
1128 * Receive a control message
1131 ng_fec_rcvmsg(node_p node, struct ng_mesg *msg,
1132 const char *retaddr, struct ng_mesg **rptr)
1134 const priv_p priv = node->private;
1135 struct ng_fec_bundle *b;
1136 struct ng_mesg *resp = NULL;
1140 b = &priv->fec_bundle;
1142 switch (msg->header.typecookie) {
1143 case NGM_FEC_COOKIE:
1144 switch (msg->header.cmd) {
1145 case NGM_FEC_ADD_IFACE:
1147 error = ng_fec_addport(priv, ifname);
1149 case NGM_FEC_DEL_IFACE:
1151 error = ng_fec_delport(priv, ifname);
1153 case NGM_FEC_SET_MODE_MAC:
1154 b->fec_btype = FEC_BTYPE_MAC;
1157 case NGM_FEC_SET_MODE_INET:
1158 b->fec_btype = FEC_BTYPE_INET;
1161 case NGM_FEC_SET_MODE_INET6:
1162 b->fec_btype = FEC_BTYPE_INET6;
1178 FREE(resp, M_NETGRAPH);
1179 FREE(msg, M_NETGRAPH);
1184 * Shutdown and remove the node and its associated interface.
1187 ng_fec_rmnode(node_p node)
1189 const priv_p priv = node->private;
1190 struct ng_fec_bundle *b;
1191 struct ng_fec_portlist *p;
1192 char ifname[IFNAMSIZ];
1194 b = &priv->fec_bundle;
1195 ng_fec_stop(&priv->arpcom.ac_if);
1197 while (!TAILQ_EMPTY(&b->ng_fec_ports)) {
1198 p = TAILQ_FIRST(&b->ng_fec_ports);
1199 sprintf(ifname, "%s%d",
1201 p->fec_if->if_unit);
1202 ng_fec_delport(priv, ifname);
1207 if (ng_ether_input_p != NULL)
1208 ng_ether_input_p = NULL;
1209 ether_ifdetach(&priv->arpcom.ac_if, ETHER_BPF_SUPPORTED);
1210 ifmedia_removeall(&priv->ifmedia);
1211 ng_fec_free_unit(priv->unit);
1212 FREE(priv, M_NETGRAPH);
1213 node->private = NULL;