xref: /freebsd/sys/net/if_lagg.c (revision 2f513db72b034fd5ef7f080b11be5c711c15186a)
1 /*	$OpenBSD: if_trunk.c,v 1.30 2007/01/31 06:20:19 reyk Exp $	*/
2 
3 /*
4  * Copyright (c) 2005, 2006 Reyk Floeter <reyk@openbsd.org>
5  * Copyright (c) 2007 Andrew Thompson <thompsa@FreeBSD.org>
6  * Copyright (c) 2014, 2016 Marcelo Araujo <araujo@FreeBSD.org>
7  *
8  * Permission to use, copy, modify, and distribute this software for any
9  * purpose with or without fee is hereby granted, provided that the above
10  * copyright notice and this permission notice appear in all copies.
11  *
12  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19  */
20 
21 #include <sys/cdefs.h>
22 __FBSDID("$FreeBSD$");
23 
24 #include "opt_inet.h"
25 #include "opt_inet6.h"
26 #include "opt_kern_tls.h"
27 #include "opt_ratelimit.h"
28 
29 #include <sys/param.h>
30 #include <sys/kernel.h>
31 #include <sys/malloc.h>
32 #include <sys/mbuf.h>
33 #include <sys/queue.h>
34 #include <sys/socket.h>
35 #include <sys/sockio.h>
36 #include <sys/sysctl.h>
37 #include <sys/module.h>
38 #include <sys/priv.h>
39 #include <sys/systm.h>
40 #include <sys/proc.h>
41 #include <sys/lock.h>
42 #include <sys/rmlock.h>
43 #include <sys/sx.h>
44 #include <sys/taskqueue.h>
45 #include <sys/eventhandler.h>
46 
47 #include <net/ethernet.h>
48 #include <net/if.h>
49 #include <net/if_clone.h>
50 #include <net/if_arp.h>
51 #include <net/if_dl.h>
52 #include <net/if_media.h>
53 #include <net/if_types.h>
54 #include <net/if_var.h>
55 #include <net/bpf.h>
56 #include <net/route.h>
57 #include <net/vnet.h>
58 
59 #if defined(INET) || defined(INET6)
60 #include <netinet/in.h>
61 #include <netinet/ip.h>
62 #endif
63 #ifdef INET
64 #include <netinet/in_systm.h>
65 #include <netinet/if_ether.h>
66 #endif
67 
68 #ifdef INET6
69 #include <netinet/ip6.h>
70 #include <netinet6/in6_var.h>
71 #include <netinet6/in6_ifattach.h>
72 #endif
73 
74 #include <net/if_vlan_var.h>
75 #include <net/if_lagg.h>
76 #include <net/ieee8023ad_lacp.h>
77 
78 #ifdef INET6
79 /*
80  * XXX: declare here to avoid to include many inet6 related files..
81  * should be more generalized?
82  */
83 extern void	nd6_setmtu(struct ifnet *);
84 #endif
85 
86 #define	LAGG_RLOCK()	struct epoch_tracker lagg_et; epoch_enter_preempt(net_epoch_preempt, &lagg_et)
87 #define	LAGG_RUNLOCK()	epoch_exit_preempt(net_epoch_preempt, &lagg_et)
88 #define	LAGG_RLOCK_ASSERT()	NET_EPOCH_ASSERT()
89 #define	LAGG_UNLOCK_ASSERT()	MPASS(!in_epoch(net_epoch_preempt))
90 
91 #define	LAGG_SX_INIT(_sc)	sx_init(&(_sc)->sc_sx, "if_lagg sx")
92 #define	LAGG_SX_DESTROY(_sc)	sx_destroy(&(_sc)->sc_sx)
93 #define	LAGG_XLOCK(_sc)		sx_xlock(&(_sc)->sc_sx)
94 #define	LAGG_XUNLOCK(_sc)	sx_xunlock(&(_sc)->sc_sx)
95 #define	LAGG_SXLOCK_ASSERT(_sc)	sx_assert(&(_sc)->sc_sx, SA_LOCKED)
96 #define	LAGG_XLOCK_ASSERT(_sc)	sx_assert(&(_sc)->sc_sx, SA_XLOCKED)
97 
98 /* Special flags we should propagate to the lagg ports. */
99 static struct {
100 	int flag;
101 	int (*func)(struct ifnet *, int);
102 } lagg_pflags[] = {
103 	{IFF_PROMISC, ifpromisc},
104 	{IFF_ALLMULTI, if_allmulti},
105 	{0, NULL}
106 };
107 
108 struct lagg_snd_tag {
109 	struct m_snd_tag com;
110 	struct m_snd_tag *tag;
111 };
112 
113 VNET_DEFINE(SLIST_HEAD(__trhead, lagg_softc), lagg_list); /* list of laggs */
114 #define	V_lagg_list	VNET(lagg_list)
115 VNET_DEFINE_STATIC(struct mtx, lagg_list_mtx);
116 #define	V_lagg_list_mtx	VNET(lagg_list_mtx)
117 #define	LAGG_LIST_LOCK_INIT(x)		mtx_init(&V_lagg_list_mtx, \
118 					"if_lagg list", NULL, MTX_DEF)
119 #define	LAGG_LIST_LOCK_DESTROY(x)	mtx_destroy(&V_lagg_list_mtx)
120 #define	LAGG_LIST_LOCK(x)		mtx_lock(&V_lagg_list_mtx)
121 #define	LAGG_LIST_UNLOCK(x)		mtx_unlock(&V_lagg_list_mtx)
122 eventhandler_tag	lagg_detach_cookie = NULL;
123 
124 static int	lagg_clone_create(struct if_clone *, int, caddr_t);
125 static void	lagg_clone_destroy(struct ifnet *);
126 VNET_DEFINE_STATIC(struct if_clone *, lagg_cloner);
127 #define	V_lagg_cloner	VNET(lagg_cloner)
128 static const char laggname[] = "lagg";
129 static MALLOC_DEFINE(M_LAGG, laggname, "802.3AD Link Aggregation Interface");
130 
131 static void	lagg_capabilities(struct lagg_softc *);
132 static int	lagg_port_create(struct lagg_softc *, struct ifnet *);
133 static int	lagg_port_destroy(struct lagg_port *, int);
134 static struct mbuf *lagg_input(struct ifnet *, struct mbuf *);
135 static void	lagg_linkstate(struct lagg_softc *);
136 static void	lagg_port_state(struct ifnet *, int);
137 static int	lagg_port_ioctl(struct ifnet *, u_long, caddr_t);
138 static int	lagg_port_output(struct ifnet *, struct mbuf *,
139 		    const struct sockaddr *, struct route *);
140 static void	lagg_port_ifdetach(void *arg __unused, struct ifnet *);
141 #ifdef LAGG_PORT_STACKING
142 static int	lagg_port_checkstacking(struct lagg_softc *);
143 #endif
144 static void	lagg_port2req(struct lagg_port *, struct lagg_reqport *);
145 static void	lagg_init(void *);
146 static void	lagg_stop(struct lagg_softc *);
147 static int	lagg_ioctl(struct ifnet *, u_long, caddr_t);
148 #if defined(KERN_TLS) || defined(RATELIMIT)
149 static int	lagg_snd_tag_alloc(struct ifnet *,
150 		    union if_snd_tag_alloc_params *,
151 		    struct m_snd_tag **);
152 static int	lagg_snd_tag_modify(struct m_snd_tag *,
153 		    union if_snd_tag_modify_params *);
154 static int	lagg_snd_tag_query(struct m_snd_tag *,
155 		    union if_snd_tag_query_params *);
156 static void	lagg_snd_tag_free(struct m_snd_tag *);
157 static void     lagg_ratelimit_query(struct ifnet *,
158 		    struct if_ratelimit_query_results *);
159 #endif
160 static int	lagg_setmulti(struct lagg_port *);
161 static int	lagg_clrmulti(struct lagg_port *);
162 static	int	lagg_setcaps(struct lagg_port *, int cap);
163 static	int	lagg_setflag(struct lagg_port *, int, int,
164 		    int (*func)(struct ifnet *, int));
165 static	int	lagg_setflags(struct lagg_port *, int status);
166 static uint64_t lagg_get_counter(struct ifnet *ifp, ift_counter cnt);
167 static int	lagg_transmit(struct ifnet *, struct mbuf *);
168 static void	lagg_qflush(struct ifnet *);
169 static int	lagg_media_change(struct ifnet *);
170 static void	lagg_media_status(struct ifnet *, struct ifmediareq *);
171 static struct lagg_port *lagg_link_active(struct lagg_softc *,
172 	    struct lagg_port *);
173 
174 /* Simple round robin */
175 static void	lagg_rr_attach(struct lagg_softc *);
176 static int	lagg_rr_start(struct lagg_softc *, struct mbuf *);
177 static struct mbuf *lagg_rr_input(struct lagg_softc *, struct lagg_port *,
178 		    struct mbuf *);
179 
180 /* Active failover */
181 static int	lagg_fail_start(struct lagg_softc *, struct mbuf *);
182 static struct mbuf *lagg_fail_input(struct lagg_softc *, struct lagg_port *,
183 		    struct mbuf *);
184 
185 /* Loadbalancing */
186 static void	lagg_lb_attach(struct lagg_softc *);
187 static void	lagg_lb_detach(struct lagg_softc *);
188 static int	lagg_lb_port_create(struct lagg_port *);
189 static void	lagg_lb_port_destroy(struct lagg_port *);
190 static int	lagg_lb_start(struct lagg_softc *, struct mbuf *);
191 static struct mbuf *lagg_lb_input(struct lagg_softc *, struct lagg_port *,
192 		    struct mbuf *);
193 static int	lagg_lb_porttable(struct lagg_softc *, struct lagg_port *);
194 
195 /* Broadcast */
196 static int    lagg_bcast_start(struct lagg_softc *, struct mbuf *);
197 static struct mbuf *lagg_bcast_input(struct lagg_softc *, struct lagg_port *,
198 		    struct mbuf *);
199 
200 /* 802.3ad LACP */
201 static void	lagg_lacp_attach(struct lagg_softc *);
202 static void	lagg_lacp_detach(struct lagg_softc *);
203 static int	lagg_lacp_start(struct lagg_softc *, struct mbuf *);
204 static struct mbuf *lagg_lacp_input(struct lagg_softc *, struct lagg_port *,
205 		    struct mbuf *);
206 static void	lagg_lacp_lladdr(struct lagg_softc *);
207 
208 /* lagg protocol table */
209 static const struct lagg_proto {
210 	lagg_proto	pr_num;
211 	void		(*pr_attach)(struct lagg_softc *);
212 	void		(*pr_detach)(struct lagg_softc *);
213 	int		(*pr_start)(struct lagg_softc *, struct mbuf *);
214 	struct mbuf *	(*pr_input)(struct lagg_softc *, struct lagg_port *,
215 			    struct mbuf *);
216 	int		(*pr_addport)(struct lagg_port *);
217 	void		(*pr_delport)(struct lagg_port *);
218 	void		(*pr_linkstate)(struct lagg_port *);
219 	void 		(*pr_init)(struct lagg_softc *);
220 	void 		(*pr_stop)(struct lagg_softc *);
221 	void 		(*pr_lladdr)(struct lagg_softc *);
222 	void		(*pr_request)(struct lagg_softc *, void *);
223 	void		(*pr_portreq)(struct lagg_port *, void *);
224 } lagg_protos[] = {
225     {
226 	.pr_num = LAGG_PROTO_NONE
227     },
228     {
229 	.pr_num = LAGG_PROTO_ROUNDROBIN,
230 	.pr_attach = lagg_rr_attach,
231 	.pr_start = lagg_rr_start,
232 	.pr_input = lagg_rr_input,
233     },
234     {
235 	.pr_num = LAGG_PROTO_FAILOVER,
236 	.pr_start = lagg_fail_start,
237 	.pr_input = lagg_fail_input,
238     },
239     {
240 	.pr_num = LAGG_PROTO_LOADBALANCE,
241 	.pr_attach = lagg_lb_attach,
242 	.pr_detach = lagg_lb_detach,
243 	.pr_start = lagg_lb_start,
244 	.pr_input = lagg_lb_input,
245 	.pr_addport = lagg_lb_port_create,
246 	.pr_delport = lagg_lb_port_destroy,
247     },
248     {
249 	.pr_num = LAGG_PROTO_LACP,
250 	.pr_attach = lagg_lacp_attach,
251 	.pr_detach = lagg_lacp_detach,
252 	.pr_start = lagg_lacp_start,
253 	.pr_input = lagg_lacp_input,
254 	.pr_addport = lacp_port_create,
255 	.pr_delport = lacp_port_destroy,
256 	.pr_linkstate = lacp_linkstate,
257 	.pr_init = lacp_init,
258 	.pr_stop = lacp_stop,
259 	.pr_lladdr = lagg_lacp_lladdr,
260 	.pr_request = lacp_req,
261 	.pr_portreq = lacp_portreq,
262     },
263     {
264 	.pr_num = LAGG_PROTO_BROADCAST,
265 	.pr_start = lagg_bcast_start,
266 	.pr_input = lagg_bcast_input,
267     },
268 };
269 
270 SYSCTL_DECL(_net_link);
271 SYSCTL_NODE(_net_link, OID_AUTO, lagg, CTLFLAG_RW, 0,
272     "Link Aggregation");
273 
274 /* Allow input on any failover links */
275 VNET_DEFINE_STATIC(int, lagg_failover_rx_all);
276 #define	V_lagg_failover_rx_all	VNET(lagg_failover_rx_all)
277 SYSCTL_INT(_net_link_lagg, OID_AUTO, failover_rx_all, CTLFLAG_RW | CTLFLAG_VNET,
278     &VNET_NAME(lagg_failover_rx_all), 0,
279     "Accept input from any interface in a failover lagg");
280 
281 /* Default value for using flowid */
282 VNET_DEFINE_STATIC(int, def_use_flowid) = 0;
283 #define	V_def_use_flowid	VNET(def_use_flowid)
284 SYSCTL_INT(_net_link_lagg, OID_AUTO, default_use_flowid, CTLFLAG_RWTUN,
285     &VNET_NAME(def_use_flowid), 0,
286     "Default setting for using flow id for load sharing");
287 
288 /* Default value for using numa */
289 VNET_DEFINE_STATIC(int, def_use_numa) = 1;
290 #define	V_def_use_numa	VNET(def_use_numa)
291 SYSCTL_INT(_net_link_lagg, OID_AUTO, default_use_numa, CTLFLAG_RWTUN,
292     &VNET_NAME(def_use_numa), 0,
293     "Use numa to steer flows");
294 
295 /* Default value for flowid shift */
296 VNET_DEFINE_STATIC(int, def_flowid_shift) = 16;
297 #define	V_def_flowid_shift	VNET(def_flowid_shift)
298 SYSCTL_INT(_net_link_lagg, OID_AUTO, default_flowid_shift, CTLFLAG_RWTUN,
299     &VNET_NAME(def_flowid_shift), 0,
300     "Default setting for flowid shift for load sharing");
301 
302 static void
303 vnet_lagg_init(const void *unused __unused)
304 {
305 
306 	LAGG_LIST_LOCK_INIT();
307 	SLIST_INIT(&V_lagg_list);
308 	V_lagg_cloner = if_clone_simple(laggname, lagg_clone_create,
309 	    lagg_clone_destroy, 0);
310 }
311 VNET_SYSINIT(vnet_lagg_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
312     vnet_lagg_init, NULL);
313 
314 static void
315 vnet_lagg_uninit(const void *unused __unused)
316 {
317 
318 	if_clone_detach(V_lagg_cloner);
319 	LAGG_LIST_LOCK_DESTROY();
320 }
321 VNET_SYSUNINIT(vnet_lagg_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY,
322     vnet_lagg_uninit, NULL);
323 
324 static int
325 lagg_modevent(module_t mod, int type, void *data)
326 {
327 
328 	switch (type) {
329 	case MOD_LOAD:
330 		lagg_input_p = lagg_input;
331 		lagg_linkstate_p = lagg_port_state;
332 		lagg_detach_cookie = EVENTHANDLER_REGISTER(
333 		    ifnet_departure_event, lagg_port_ifdetach, NULL,
334 		    EVENTHANDLER_PRI_ANY);
335 		break;
336 	case MOD_UNLOAD:
337 		EVENTHANDLER_DEREGISTER(ifnet_departure_event,
338 		    lagg_detach_cookie);
339 		lagg_input_p = NULL;
340 		lagg_linkstate_p = NULL;
341 		break;
342 	default:
343 		return (EOPNOTSUPP);
344 	}
345 	return (0);
346 }
347 
348 static moduledata_t lagg_mod = {
349 	"if_lagg",
350 	lagg_modevent,
351 	0
352 };
353 
354 DECLARE_MODULE(if_lagg, lagg_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
355 MODULE_VERSION(if_lagg, 1);
356 
357 static void
358 lagg_proto_attach(struct lagg_softc *sc, lagg_proto pr)
359 {
360 
361 	LAGG_XLOCK_ASSERT(sc);
362 	KASSERT(sc->sc_proto == LAGG_PROTO_NONE, ("%s: sc %p has proto",
363 	    __func__, sc));
364 
365 	if (sc->sc_ifflags & IFF_DEBUG)
366 		if_printf(sc->sc_ifp, "using proto %u\n", pr);
367 
368 	if (lagg_protos[pr].pr_attach != NULL)
369 		lagg_protos[pr].pr_attach(sc);
370 	sc->sc_proto = pr;
371 }
372 
373 static void
374 lagg_proto_detach(struct lagg_softc *sc)
375 {
376 	lagg_proto pr;
377 
378 	LAGG_XLOCK_ASSERT(sc);
379 	pr = sc->sc_proto;
380 	sc->sc_proto = LAGG_PROTO_NONE;
381 
382 	if (lagg_protos[pr].pr_detach != NULL)
383 		lagg_protos[pr].pr_detach(sc);
384 }
385 
386 static int
387 lagg_proto_start(struct lagg_softc *sc, struct mbuf *m)
388 {
389 
390 	return (lagg_protos[sc->sc_proto].pr_start(sc, m));
391 }
392 
393 static struct mbuf *
394 lagg_proto_input(struct lagg_softc *sc, struct lagg_port *lp, struct mbuf *m)
395 {
396 
397 	return (lagg_protos[sc->sc_proto].pr_input(sc, lp, m));
398 }
399 
400 static int
401 lagg_proto_addport(struct lagg_softc *sc, struct lagg_port *lp)
402 {
403 
404 	if (lagg_protos[sc->sc_proto].pr_addport == NULL)
405 		return (0);
406 	else
407 		return (lagg_protos[sc->sc_proto].pr_addport(lp));
408 }
409 
410 static void
411 lagg_proto_delport(struct lagg_softc *sc, struct lagg_port *lp)
412 {
413 
414 	if (lagg_protos[sc->sc_proto].pr_delport != NULL)
415 		lagg_protos[sc->sc_proto].pr_delport(lp);
416 }
417 
418 static void
419 lagg_proto_linkstate(struct lagg_softc *sc, struct lagg_port *lp)
420 {
421 
422 	if (lagg_protos[sc->sc_proto].pr_linkstate != NULL)
423 		lagg_protos[sc->sc_proto].pr_linkstate(lp);
424 }
425 
426 static void
427 lagg_proto_init(struct lagg_softc *sc)
428 {
429 
430 	if (lagg_protos[sc->sc_proto].pr_init != NULL)
431 		lagg_protos[sc->sc_proto].pr_init(sc);
432 }
433 
434 static void
435 lagg_proto_stop(struct lagg_softc *sc)
436 {
437 
438 	if (lagg_protos[sc->sc_proto].pr_stop != NULL)
439 		lagg_protos[sc->sc_proto].pr_stop(sc);
440 }
441 
442 static void
443 lagg_proto_lladdr(struct lagg_softc *sc)
444 {
445 
446 	if (lagg_protos[sc->sc_proto].pr_lladdr != NULL)
447 		lagg_protos[sc->sc_proto].pr_lladdr(sc);
448 }
449 
450 static void
451 lagg_proto_request(struct lagg_softc *sc, void *v)
452 {
453 
454 	if (lagg_protos[sc->sc_proto].pr_request != NULL)
455 		lagg_protos[sc->sc_proto].pr_request(sc, v);
456 }
457 
458 static void
459 lagg_proto_portreq(struct lagg_softc *sc, struct lagg_port *lp, void *v)
460 {
461 
462 	if (lagg_protos[sc->sc_proto].pr_portreq != NULL)
463 		lagg_protos[sc->sc_proto].pr_portreq(lp, v);
464 }
465 
466 /*
467  * This routine is run via an vlan
468  * config EVENT
469  */
470 static void
471 lagg_register_vlan(void *arg, struct ifnet *ifp, u_int16_t vtag)
472 {
473 	struct lagg_softc *sc = ifp->if_softc;
474 	struct lagg_port *lp;
475 
476 	if (ifp->if_softc !=  arg)   /* Not our event */
477 		return;
478 
479 	LAGG_RLOCK();
480 	CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
481 		EVENTHANDLER_INVOKE(vlan_config, lp->lp_ifp, vtag);
482 	LAGG_RUNLOCK();
483 }
484 
485 /*
486  * This routine is run via an vlan
487  * unconfig EVENT
488  */
489 static void
490 lagg_unregister_vlan(void *arg, struct ifnet *ifp, u_int16_t vtag)
491 {
492 	struct lagg_softc *sc = ifp->if_softc;
493 	struct lagg_port *lp;
494 
495 	if (ifp->if_softc !=  arg)   /* Not our event */
496 		return;
497 
498 	LAGG_RLOCK();
499 	CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
500 		EVENTHANDLER_INVOKE(vlan_unconfig, lp->lp_ifp, vtag);
501 	LAGG_RUNLOCK();
502 }
503 
504 static int
505 lagg_clone_create(struct if_clone *ifc, int unit, caddr_t params)
506 {
507 	struct lagg_softc *sc;
508 	struct ifnet *ifp;
509 	static const u_char eaddr[6];	/* 00:00:00:00:00:00 */
510 
511 	sc = malloc(sizeof(*sc), M_LAGG, M_WAITOK|M_ZERO);
512 	ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
513 	if (ifp == NULL) {
514 		free(sc, M_LAGG);
515 		return (ENOSPC);
516 	}
517 	LAGG_SX_INIT(sc);
518 
519 	LAGG_XLOCK(sc);
520 	if (V_def_use_flowid)
521 		sc->sc_opts |= LAGG_OPT_USE_FLOWID;
522 	if (V_def_use_numa)
523 		sc->sc_opts |= LAGG_OPT_USE_NUMA;
524 	sc->flowid_shift = V_def_flowid_shift;
525 
526 	/* Hash all layers by default */
527 	sc->sc_flags = MBUF_HASHFLAG_L2|MBUF_HASHFLAG_L3|MBUF_HASHFLAG_L4;
528 
529 	lagg_proto_attach(sc, LAGG_PROTO_DEFAULT);
530 
531 	CK_SLIST_INIT(&sc->sc_ports);
532 
533 	/* Initialise pseudo media types */
534 	ifmedia_init(&sc->sc_media, 0, lagg_media_change,
535 	    lagg_media_status);
536 	ifmedia_add(&sc->sc_media, IFM_ETHER | IFM_AUTO, 0, NULL);
537 	ifmedia_set(&sc->sc_media, IFM_ETHER | IFM_AUTO);
538 
539 	if_initname(ifp, laggname, unit);
540 	ifp->if_softc = sc;
541 	ifp->if_transmit = lagg_transmit;
542 	ifp->if_qflush = lagg_qflush;
543 	ifp->if_init = lagg_init;
544 	ifp->if_ioctl = lagg_ioctl;
545 	ifp->if_get_counter = lagg_get_counter;
546 	ifp->if_flags = IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST;
547 #if defined(KERN_TLS) || defined(RATELIMIT)
548 	ifp->if_snd_tag_alloc = lagg_snd_tag_alloc;
549 	ifp->if_snd_tag_modify = lagg_snd_tag_modify;
550 	ifp->if_snd_tag_query = lagg_snd_tag_query;
551 	ifp->if_snd_tag_free = lagg_snd_tag_free;
552 	ifp->if_ratelimit_query = lagg_ratelimit_query;
553 #endif
554 	ifp->if_capenable = ifp->if_capabilities = IFCAP_HWSTATS;
555 
556 	/*
557 	 * Attach as an ordinary ethernet device, children will be attached
558 	 * as special device IFT_IEEE8023ADLAG.
559 	 */
560 	ether_ifattach(ifp, eaddr);
561 
562 	sc->vlan_attach = EVENTHANDLER_REGISTER(vlan_config,
563 		lagg_register_vlan, sc, EVENTHANDLER_PRI_FIRST);
564 	sc->vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig,
565 		lagg_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST);
566 
567 	/* Insert into the global list of laggs */
568 	LAGG_LIST_LOCK();
569 	SLIST_INSERT_HEAD(&V_lagg_list, sc, sc_entries);
570 	LAGG_LIST_UNLOCK();
571 	LAGG_XUNLOCK(sc);
572 
573 	return (0);
574 }
575 
576 static void
577 lagg_clone_destroy(struct ifnet *ifp)
578 {
579 	struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
580 	struct lagg_port *lp;
581 
582 	LAGG_XLOCK(sc);
583 	sc->sc_destroying = 1;
584 	lagg_stop(sc);
585 	ifp->if_flags &= ~IFF_UP;
586 
587 	EVENTHANDLER_DEREGISTER(vlan_config, sc->vlan_attach);
588 	EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vlan_detach);
589 
590 	/* Shutdown and remove lagg ports */
591 	while ((lp = CK_SLIST_FIRST(&sc->sc_ports)) != NULL)
592 		lagg_port_destroy(lp, 1);
593 
594 	/* Unhook the aggregation protocol */
595 	lagg_proto_detach(sc);
596 	LAGG_XUNLOCK(sc);
597 
598 	ifmedia_removeall(&sc->sc_media);
599 	ether_ifdetach(ifp);
600 	if_free(ifp);
601 
602 	LAGG_LIST_LOCK();
603 	SLIST_REMOVE(&V_lagg_list, sc, lagg_softc, sc_entries);
604 	LAGG_LIST_UNLOCK();
605 
606 	LAGG_SX_DESTROY(sc);
607 	free(sc, M_LAGG);
608 }
609 
610 static void
611 lagg_capabilities(struct lagg_softc *sc)
612 {
613 	struct lagg_port *lp;
614 	int cap, ena, pena;
615 	uint64_t hwa;
616 	struct ifnet_hw_tsomax hw_tsomax;
617 
618 	LAGG_XLOCK_ASSERT(sc);
619 
620 	/* Get common enabled capabilities for the lagg ports */
621 	ena = ~0;
622 	CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
623 		ena &= lp->lp_ifp->if_capenable;
624 	ena = (ena == ~0 ? 0 : ena);
625 
626 	/*
627 	 * Apply common enabled capabilities back to the lagg ports.
628 	 * May require several iterations if they are dependent.
629 	 */
630 	do {
631 		pena = ena;
632 		CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
633 			lagg_setcaps(lp, ena);
634 			ena &= lp->lp_ifp->if_capenable;
635 		}
636 	} while (pena != ena);
637 
638 	/* Get other capabilities from the lagg ports */
639 	cap = ~0;
640 	hwa = ~(uint64_t)0;
641 	memset(&hw_tsomax, 0, sizeof(hw_tsomax));
642 	CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
643 		cap &= lp->lp_ifp->if_capabilities;
644 		hwa &= lp->lp_ifp->if_hwassist;
645 		if_hw_tsomax_common(lp->lp_ifp, &hw_tsomax);
646 	}
647 	cap = (cap == ~0 ? 0 : cap);
648 	hwa = (hwa == ~(uint64_t)0 ? 0 : hwa);
649 
650 	if (sc->sc_ifp->if_capabilities != cap ||
651 	    sc->sc_ifp->if_capenable != ena ||
652 	    sc->sc_ifp->if_hwassist != hwa ||
653 	    if_hw_tsomax_update(sc->sc_ifp, &hw_tsomax) != 0) {
654 		sc->sc_ifp->if_capabilities = cap;
655 		sc->sc_ifp->if_capenable = ena;
656 		sc->sc_ifp->if_hwassist = hwa;
657 		getmicrotime(&sc->sc_ifp->if_lastchange);
658 
659 		if (sc->sc_ifflags & IFF_DEBUG)
660 			if_printf(sc->sc_ifp,
661 			    "capabilities 0x%08x enabled 0x%08x\n", cap, ena);
662 	}
663 }
664 
665 static int
666 lagg_port_create(struct lagg_softc *sc, struct ifnet *ifp)
667 {
668 	struct lagg_softc *sc_ptr;
669 	struct lagg_port *lp, *tlp;
670 	struct ifreq ifr;
671 	int error, i, oldmtu;
672 	uint64_t *pval;
673 
674 	LAGG_XLOCK_ASSERT(sc);
675 
676 	if (sc->sc_ifp == ifp) {
677 		if_printf(sc->sc_ifp,
678 		    "cannot add a lagg to itself as a port\n");
679 		return (EINVAL);
680 	}
681 
682 	/* Limit the maximal number of lagg ports */
683 	if (sc->sc_count >= LAGG_MAX_PORTS)
684 		return (ENOSPC);
685 
686 	/* Check if port has already been associated to a lagg */
687 	if (ifp->if_lagg != NULL) {
688 		/* Port is already in the current lagg? */
689 		lp = (struct lagg_port *)ifp->if_lagg;
690 		if (lp->lp_softc == sc)
691 			return (EEXIST);
692 		return (EBUSY);
693 	}
694 
695 	/* XXX Disallow non-ethernet interfaces (this should be any of 802) */
696 	if (ifp->if_type != IFT_ETHER && ifp->if_type != IFT_L2VLAN)
697 		return (EPROTONOSUPPORT);
698 
699 	/* Allow the first Ethernet member to define the MTU */
700 	oldmtu = -1;
701 	if (CK_SLIST_EMPTY(&sc->sc_ports)) {
702 		sc->sc_ifp->if_mtu = ifp->if_mtu;
703 	} else if (sc->sc_ifp->if_mtu != ifp->if_mtu) {
704 		if (ifp->if_ioctl == NULL) {
705 			if_printf(sc->sc_ifp, "cannot change MTU for %s\n",
706 			    ifp->if_xname);
707 			return (EINVAL);
708 		}
709 		oldmtu = ifp->if_mtu;
710 		strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name));
711 		ifr.ifr_mtu = sc->sc_ifp->if_mtu;
712 		error = (*ifp->if_ioctl)(ifp, SIOCSIFMTU, (caddr_t)&ifr);
713 		if (error != 0) {
714 			if_printf(sc->sc_ifp, "invalid MTU for %s\n",
715 			    ifp->if_xname);
716 			return (error);
717 		}
718 		ifr.ifr_mtu = oldmtu;
719 	}
720 
721 	lp = malloc(sizeof(struct lagg_port), M_LAGG, M_WAITOK|M_ZERO);
722 	lp->lp_softc = sc;
723 
724 	/* Check if port is a stacked lagg */
725 	LAGG_LIST_LOCK();
726 	SLIST_FOREACH(sc_ptr, &V_lagg_list, sc_entries) {
727 		if (ifp == sc_ptr->sc_ifp) {
728 			LAGG_LIST_UNLOCK();
729 			free(lp, M_LAGG);
730 			if (oldmtu != -1)
731 				(*ifp->if_ioctl)(ifp, SIOCSIFMTU,
732 				    (caddr_t)&ifr);
733 			return (EINVAL);
734 			/* XXX disable stacking for the moment, its untested */
735 #ifdef LAGG_PORT_STACKING
736 			lp->lp_flags |= LAGG_PORT_STACK;
737 			if (lagg_port_checkstacking(sc_ptr) >=
738 			    LAGG_MAX_STACKING) {
739 				LAGG_LIST_UNLOCK();
740 				free(lp, M_LAGG);
741 				if (oldmtu != -1)
742 					(*ifp->if_ioctl)(ifp, SIOCSIFMTU,
743 					    (caddr_t)&ifr);
744 				return (E2BIG);
745 			}
746 #endif
747 		}
748 	}
749 	LAGG_LIST_UNLOCK();
750 
751 	if_ref(ifp);
752 	lp->lp_ifp = ifp;
753 
754 	bcopy(IF_LLADDR(ifp), lp->lp_lladdr, ETHER_ADDR_LEN);
755 	lp->lp_ifcapenable = ifp->if_capenable;
756 	if (CK_SLIST_EMPTY(&sc->sc_ports)) {
757 		bcopy(IF_LLADDR(ifp), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
758 		lagg_proto_lladdr(sc);
759 		EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
760 	} else {
761 		if_setlladdr(ifp, IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
762 	}
763 	lagg_setflags(lp, 1);
764 
765 	if (CK_SLIST_EMPTY(&sc->sc_ports))
766 		sc->sc_primary = lp;
767 
768 	/* Change the interface type */
769 	lp->lp_iftype = ifp->if_type;
770 	ifp->if_type = IFT_IEEE8023ADLAG;
771 	ifp->if_lagg = lp;
772 	lp->lp_ioctl = ifp->if_ioctl;
773 	ifp->if_ioctl = lagg_port_ioctl;
774 	lp->lp_output = ifp->if_output;
775 	ifp->if_output = lagg_port_output;
776 
777 	/* Read port counters */
778 	pval = lp->port_counters.val;
779 	for (i = 0; i < IFCOUNTERS; i++, pval++)
780 		*pval = ifp->if_get_counter(ifp, i);
781 
782 	/*
783 	 * Insert into the list of ports.
784 	 * Keep ports sorted by if_index. It is handy, when configuration
785 	 * is predictable and `ifconfig laggN create ...` command
786 	 * will lead to the same result each time.
787 	 */
788 	CK_SLIST_FOREACH(tlp, &sc->sc_ports, lp_entries) {
789 		if (tlp->lp_ifp->if_index < ifp->if_index && (
790 		    CK_SLIST_NEXT(tlp, lp_entries) == NULL ||
791 		    ((struct  lagg_port*)CK_SLIST_NEXT(tlp, lp_entries))->lp_ifp->if_index >
792 		    ifp->if_index))
793 			break;
794 	}
795 	if (tlp != NULL)
796 		CK_SLIST_INSERT_AFTER(tlp, lp, lp_entries);
797 	else
798 		CK_SLIST_INSERT_HEAD(&sc->sc_ports, lp, lp_entries);
799 	sc->sc_count++;
800 
801 	lagg_setmulti(lp);
802 
803 
804 	if ((error = lagg_proto_addport(sc, lp)) != 0) {
805 		/* Remove the port, without calling pr_delport. */
806 		lagg_port_destroy(lp, 0);
807 		if (oldmtu != -1)
808 			(*ifp->if_ioctl)(ifp, SIOCSIFMTU, (caddr_t)&ifr);
809 		return (error);
810 	}
811 
812 	/* Update lagg capabilities */
813 	lagg_capabilities(sc);
814 	lagg_linkstate(sc);
815 
816 	return (0);
817 }
818 
819 #ifdef LAGG_PORT_STACKING
820 static int
821 lagg_port_checkstacking(struct lagg_softc *sc)
822 {
823 	struct lagg_softc *sc_ptr;
824 	struct lagg_port *lp;
825 	int m = 0;
826 
827 	LAGG_SXLOCK_ASSERT(sc);
828 	CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
829 		if (lp->lp_flags & LAGG_PORT_STACK) {
830 			sc_ptr = (struct lagg_softc *)lp->lp_ifp->if_softc;
831 			m = MAX(m, lagg_port_checkstacking(sc_ptr));
832 		}
833 	}
834 
835 	return (m + 1);
836 }
837 #endif
838 
839 static void
840 lagg_port_destroy_cb(epoch_context_t ec)
841 {
842 	struct lagg_port *lp;
843 	struct ifnet *ifp;
844 
845 	lp = __containerof(ec, struct lagg_port, lp_epoch_ctx);
846 	ifp = lp->lp_ifp;
847 
848 	if_rele(ifp);
849 	free(lp, M_LAGG);
850 }
851 
852 static int
853 lagg_port_destroy(struct lagg_port *lp, int rundelport)
854 {
855 	struct lagg_softc *sc = lp->lp_softc;
856 	struct lagg_port *lp_ptr, *lp0;
857 	struct ifnet *ifp = lp->lp_ifp;
858 	uint64_t *pval, vdiff;
859 	int i;
860 
861 	LAGG_XLOCK_ASSERT(sc);
862 
863 	if (rundelport)
864 		lagg_proto_delport(sc, lp);
865 
866 	if (lp->lp_detaching == 0)
867 		lagg_clrmulti(lp);
868 
869 	/* Restore interface */
870 	ifp->if_type = lp->lp_iftype;
871 	ifp->if_ioctl = lp->lp_ioctl;
872 	ifp->if_output = lp->lp_output;
873 	ifp->if_lagg = NULL;
874 
875 	/* Update detached port counters */
876 	pval = lp->port_counters.val;
877 	for (i = 0; i < IFCOUNTERS; i++, pval++) {
878 		vdiff = ifp->if_get_counter(ifp, i) - *pval;
879 		sc->detached_counters.val[i] += vdiff;
880 	}
881 
882 	/* Finally, remove the port from the lagg */
883 	CK_SLIST_REMOVE(&sc->sc_ports, lp, lagg_port, lp_entries);
884 	sc->sc_count--;
885 
886 	/* Update the primary interface */
887 	if (lp == sc->sc_primary) {
888 		uint8_t lladdr[ETHER_ADDR_LEN];
889 
890 		if ((lp0 = CK_SLIST_FIRST(&sc->sc_ports)) == NULL)
891 			bzero(&lladdr, ETHER_ADDR_LEN);
892 		else
893 			bcopy(lp0->lp_lladdr, lladdr, ETHER_ADDR_LEN);
894 		sc->sc_primary = lp0;
895 		if (sc->sc_destroying == 0) {
896 			bcopy(lladdr, IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN);
897 			lagg_proto_lladdr(sc);
898 			EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp);
899 		}
900 
901 		/*
902 		 * Update lladdr for each port (new primary needs update
903 		 * as well, to switch from old lladdr to its 'real' one)
904 		 */
905 		CK_SLIST_FOREACH(lp_ptr, &sc->sc_ports, lp_entries)
906 			if_setlladdr(lp_ptr->lp_ifp, lladdr, ETHER_ADDR_LEN);
907 	}
908 
909 	if (lp->lp_ifflags)
910 		if_printf(ifp, "%s: lp_ifflags unclean\n", __func__);
911 
912 	if (lp->lp_detaching == 0) {
913 		lagg_setflags(lp, 0);
914 		lagg_setcaps(lp, lp->lp_ifcapenable);
915 		if_setlladdr(ifp, lp->lp_lladdr, ETHER_ADDR_LEN);
916 	}
917 
918 	/*
919 	 * free port and release it's ifnet reference after a grace period has
920 	 * elapsed.
921 	 */
922 	NET_EPOCH_CALL(lagg_port_destroy_cb, &lp->lp_epoch_ctx);
923 	/* Update lagg capabilities */
924 	lagg_capabilities(sc);
925 	lagg_linkstate(sc);
926 
927 	return (0);
928 }
929 
930 static int
931 lagg_port_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
932 {
933 	struct lagg_reqport *rp = (struct lagg_reqport *)data;
934 	struct lagg_softc *sc;
935 	struct lagg_port *lp = NULL;
936 	int error = 0;
937 
938 	/* Should be checked by the caller */
939 	if (ifp->if_type != IFT_IEEE8023ADLAG ||
940 	    (lp = ifp->if_lagg) == NULL || (sc = lp->lp_softc) == NULL)
941 		goto fallback;
942 
943 	switch (cmd) {
944 	case SIOCGLAGGPORT:
945 		if (rp->rp_portname[0] == '\0' ||
946 		    ifunit(rp->rp_portname) != ifp) {
947 			error = EINVAL;
948 			break;
949 		}
950 
951 		LAGG_RLOCK();
952 		if ((lp = ifp->if_lagg) == NULL || lp->lp_softc != sc) {
953 			error = ENOENT;
954 			LAGG_RUNLOCK();
955 			break;
956 		}
957 
958 		lagg_port2req(lp, rp);
959 		LAGG_RUNLOCK();
960 		break;
961 
962 	case SIOCSIFCAP:
963 		if (lp->lp_ioctl == NULL) {
964 			error = EINVAL;
965 			break;
966 		}
967 		error = (*lp->lp_ioctl)(ifp, cmd, data);
968 		if (error)
969 			break;
970 
971 		/* Update lagg interface capabilities */
972 		LAGG_XLOCK(sc);
973 		lagg_capabilities(sc);
974 		LAGG_XUNLOCK(sc);
975 		VLAN_CAPABILITIES(sc->sc_ifp);
976 		break;
977 
978 	case SIOCSIFMTU:
979 		/* Do not allow the MTU to be changed once joined */
980 		error = EINVAL;
981 		break;
982 
983 	default:
984 		goto fallback;
985 	}
986 
987 	return (error);
988 
989 fallback:
990 	if (lp != NULL && lp->lp_ioctl != NULL)
991 		return ((*lp->lp_ioctl)(ifp, cmd, data));
992 
993 	return (EINVAL);
994 }
995 
996 /*
997  * Requests counter @cnt data.
998  *
999  * Counter value is calculated the following way:
1000  * 1) for each port, sum  difference between current and "initial" measurements.
1001  * 2) add lagg logical interface counters.
1002  * 3) add data from detached_counters array.
1003  *
1004  * We also do the following things on ports attach/detach:
1005  * 1) On port attach we store all counters it has into port_counter array.
1006  * 2) On port detach we add the different between "initial" and
1007  *   current counters data to detached_counters array.
1008  */
1009 static uint64_t
1010 lagg_get_counter(struct ifnet *ifp, ift_counter cnt)
1011 {
1012 	struct lagg_softc *sc;
1013 	struct lagg_port *lp;
1014 	struct ifnet *lpifp;
1015 	uint64_t newval, oldval, vsum;
1016 
1017 	/* Revise this when we've got non-generic counters. */
1018 	KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt));
1019 
1020 	sc = (struct lagg_softc *)ifp->if_softc;
1021 
1022 	vsum = 0;
1023 	LAGG_RLOCK();
1024 	CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
1025 		/* Saved attached value */
1026 		oldval = lp->port_counters.val[cnt];
1027 		/* current value */
1028 		lpifp = lp->lp_ifp;
1029 		newval = lpifp->if_get_counter(lpifp, cnt);
1030 		/* Calculate diff and save new */
1031 		vsum += newval - oldval;
1032 	}
1033 	LAGG_RUNLOCK();
1034 
1035 	/*
1036 	 * Add counter data which might be added by upper
1037 	 * layer protocols operating on logical interface.
1038 	 */
1039 	vsum += if_get_counter_default(ifp, cnt);
1040 
1041 	/*
1042 	 * Add counter data from detached ports counters
1043 	 */
1044 	vsum += sc->detached_counters.val[cnt];
1045 
1046 
1047 	return (vsum);
1048 }
1049 
1050 /*
1051  * For direct output to child ports.
1052  */
1053 static int
1054 lagg_port_output(struct ifnet *ifp, struct mbuf *m,
1055 	const struct sockaddr *dst, struct route *ro)
1056 {
1057 	struct lagg_port *lp = ifp->if_lagg;
1058 
1059 	switch (dst->sa_family) {
1060 		case pseudo_AF_HDRCMPLT:
1061 		case AF_UNSPEC:
1062 			return ((*lp->lp_output)(ifp, m, dst, ro));
1063 	}
1064 
1065 	/* drop any other frames */
1066 	m_freem(m);
1067 	return (ENETDOWN);
1068 }
1069 
1070 static void
1071 lagg_port_ifdetach(void *arg __unused, struct ifnet *ifp)
1072 {
1073 	struct lagg_port *lp;
1074 	struct lagg_softc *sc;
1075 
1076 	if ((lp = ifp->if_lagg) == NULL)
1077 		return;
1078 	/* If the ifnet is just being renamed, don't do anything. */
1079 	if (ifp->if_flags & IFF_RENAMING)
1080 		return;
1081 
1082 	sc = lp->lp_softc;
1083 
1084 	LAGG_XLOCK(sc);
1085 	lp->lp_detaching = 1;
1086 	lagg_port_destroy(lp, 1);
1087 	LAGG_XUNLOCK(sc);
1088 	VLAN_CAPABILITIES(sc->sc_ifp);
1089 }
1090 
1091 static void
1092 lagg_port2req(struct lagg_port *lp, struct lagg_reqport *rp)
1093 {
1094 	struct lagg_softc *sc = lp->lp_softc;
1095 
1096 	strlcpy(rp->rp_ifname, sc->sc_ifname, sizeof(rp->rp_ifname));
1097 	strlcpy(rp->rp_portname, lp->lp_ifp->if_xname, sizeof(rp->rp_portname));
1098 	rp->rp_prio = lp->lp_prio;
1099 	rp->rp_flags = lp->lp_flags;
1100 	lagg_proto_portreq(sc, lp, &rp->rp_psc);
1101 
1102 	/* Add protocol specific flags */
1103 	switch (sc->sc_proto) {
1104 		case LAGG_PROTO_FAILOVER:
1105 			if (lp == sc->sc_primary)
1106 				rp->rp_flags |= LAGG_PORT_MASTER;
1107 			if (lp == lagg_link_active(sc, sc->sc_primary))
1108 				rp->rp_flags |= LAGG_PORT_ACTIVE;
1109 			break;
1110 
1111 		case LAGG_PROTO_ROUNDROBIN:
1112 		case LAGG_PROTO_LOADBALANCE:
1113 		case LAGG_PROTO_BROADCAST:
1114 			if (LAGG_PORTACTIVE(lp))
1115 				rp->rp_flags |= LAGG_PORT_ACTIVE;
1116 			break;
1117 
1118 		case LAGG_PROTO_LACP:
1119 			/* LACP has a different definition of active */
1120 			if (lacp_isactive(lp))
1121 				rp->rp_flags |= LAGG_PORT_ACTIVE;
1122 			if (lacp_iscollecting(lp))
1123 				rp->rp_flags |= LAGG_PORT_COLLECTING;
1124 			if (lacp_isdistributing(lp))
1125 				rp->rp_flags |= LAGG_PORT_DISTRIBUTING;
1126 			break;
1127 	}
1128 
1129 }
1130 
1131 static void
1132 lagg_init(void *xsc)
1133 {
1134 	struct lagg_softc *sc = (struct lagg_softc *)xsc;
1135 	struct ifnet *ifp = sc->sc_ifp;
1136 	struct lagg_port *lp;
1137 
1138 	LAGG_XLOCK(sc);
1139 	if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
1140 		LAGG_XUNLOCK(sc);
1141 		return;
1142 	}
1143 
1144 	ifp->if_drv_flags |= IFF_DRV_RUNNING;
1145 
1146 	/*
1147 	 * Update the port lladdrs if needed.
1148 	 * This might be if_setlladdr() notification
1149 	 * that lladdr has been changed.
1150 	 */
1151 	CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
1152 		if (memcmp(IF_LLADDR(ifp), IF_LLADDR(lp->lp_ifp),
1153 		    ETHER_ADDR_LEN) != 0)
1154 			if_setlladdr(lp->lp_ifp, IF_LLADDR(ifp), ETHER_ADDR_LEN);
1155 	}
1156 
1157 	lagg_proto_init(sc);
1158 
1159 	LAGG_XUNLOCK(sc);
1160 }
1161 
1162 static void
1163 lagg_stop(struct lagg_softc *sc)
1164 {
1165 	struct ifnet *ifp = sc->sc_ifp;
1166 
1167 	LAGG_XLOCK_ASSERT(sc);
1168 
1169 	if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
1170 		return;
1171 
1172 	ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1173 
1174 	lagg_proto_stop(sc);
1175 }
1176 
1177 static int
1178 lagg_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
1179 {
1180 	struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
1181 	struct lagg_reqall *ra = (struct lagg_reqall *)data;
1182 	struct lagg_reqopts *ro = (struct lagg_reqopts *)data;
1183 	struct lagg_reqport *rp = (struct lagg_reqport *)data, rpbuf;
1184 	struct lagg_reqflags *rf = (struct lagg_reqflags *)data;
1185 	struct ifreq *ifr = (struct ifreq *)data;
1186 	struct lagg_port *lp;
1187 	struct ifnet *tpif;
1188 	struct thread *td = curthread;
1189 	char *buf, *outbuf;
1190 	int count, buflen, len, error = 0, oldmtu;
1191 
1192 	bzero(&rpbuf, sizeof(rpbuf));
1193 
1194 	switch (cmd) {
1195 	case SIOCGLAGG:
1196 		LAGG_XLOCK(sc);
1197 		buflen = sc->sc_count * sizeof(struct lagg_reqport);
1198 		outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
1199 		ra->ra_proto = sc->sc_proto;
1200 		lagg_proto_request(sc, &ra->ra_psc);
1201 		count = 0;
1202 		buf = outbuf;
1203 		len = min(ra->ra_size, buflen);
1204 		CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
1205 			if (len < sizeof(rpbuf))
1206 				break;
1207 
1208 			lagg_port2req(lp, &rpbuf);
1209 			memcpy(buf, &rpbuf, sizeof(rpbuf));
1210 			count++;
1211 			buf += sizeof(rpbuf);
1212 			len -= sizeof(rpbuf);
1213 		}
1214 		LAGG_XUNLOCK(sc);
1215 		ra->ra_ports = count;
1216 		ra->ra_size = count * sizeof(rpbuf);
1217 		error = copyout(outbuf, ra->ra_port, ra->ra_size);
1218 		free(outbuf, M_TEMP);
1219 		break;
1220 	case SIOCSLAGG:
1221 		error = priv_check(td, PRIV_NET_LAGG);
1222 		if (error)
1223 			break;
1224 		if (ra->ra_proto >= LAGG_PROTO_MAX) {
1225 			error = EPROTONOSUPPORT;
1226 			break;
1227 		}
1228 
1229 		LAGG_XLOCK(sc);
1230 		lagg_proto_detach(sc);
1231 		LAGG_UNLOCK_ASSERT();
1232 		lagg_proto_attach(sc, ra->ra_proto);
1233 		LAGG_XUNLOCK(sc);
1234 		break;
1235 	case SIOCGLAGGOPTS:
1236 		LAGG_XLOCK(sc);
1237 		ro->ro_opts = sc->sc_opts;
1238 		if (sc->sc_proto == LAGG_PROTO_LACP) {
1239 			struct lacp_softc *lsc;
1240 
1241 			lsc = (struct lacp_softc *)sc->sc_psc;
1242 			if (lsc->lsc_debug.lsc_tx_test != 0)
1243 				ro->ro_opts |= LAGG_OPT_LACP_TXTEST;
1244 			if (lsc->lsc_debug.lsc_rx_test != 0)
1245 				ro->ro_opts |= LAGG_OPT_LACP_RXTEST;
1246 			if (lsc->lsc_strict_mode != 0)
1247 				ro->ro_opts |= LAGG_OPT_LACP_STRICT;
1248 			if (lsc->lsc_fast_timeout != 0)
1249 				ro->ro_opts |= LAGG_OPT_LACP_TIMEOUT;
1250 
1251 			ro->ro_active = sc->sc_active;
1252 		} else {
1253 			ro->ro_active = 0;
1254 			CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
1255 				ro->ro_active += LAGG_PORTACTIVE(lp);
1256 		}
1257 		ro->ro_bkt = sc->sc_stride;
1258 		ro->ro_flapping = sc->sc_flapping;
1259 		ro->ro_flowid_shift = sc->flowid_shift;
1260 		LAGG_XUNLOCK(sc);
1261 		break;
1262 	case SIOCSLAGGOPTS:
1263 		error = priv_check(td, PRIV_NET_LAGG);
1264 		if (error)
1265 			break;
1266 
1267 		/*
1268 		 * The stride option was added without defining a corresponding
1269 		 * LAGG_OPT flag, so handle a non-zero value before checking
1270 		 * anything else to preserve compatibility.
1271 		 */
1272 		LAGG_XLOCK(sc);
1273 		if (ro->ro_opts == 0 && ro->ro_bkt != 0) {
1274 			if (sc->sc_proto != LAGG_PROTO_ROUNDROBIN) {
1275 				LAGG_XUNLOCK(sc);
1276 				error = EINVAL;
1277 				break;
1278 			}
1279 			sc->sc_stride = ro->ro_bkt;
1280 		}
1281 		if (ro->ro_opts == 0) {
1282 			LAGG_XUNLOCK(sc);
1283 			break;
1284 		}
1285 
1286 		/*
1287 		 * Set options.  LACP options are stored in sc->sc_psc,
1288 		 * not in sc_opts.
1289 		 */
1290 		int valid, lacp;
1291 
1292 		switch (ro->ro_opts) {
1293 		case LAGG_OPT_USE_FLOWID:
1294 		case -LAGG_OPT_USE_FLOWID:
1295 		case LAGG_OPT_USE_NUMA:
1296 		case -LAGG_OPT_USE_NUMA:
1297 		case LAGG_OPT_FLOWIDSHIFT:
1298 		case LAGG_OPT_RR_LIMIT:
1299 			valid = 1;
1300 			lacp = 0;
1301 			break;
1302 		case LAGG_OPT_LACP_TXTEST:
1303 		case -LAGG_OPT_LACP_TXTEST:
1304 		case LAGG_OPT_LACP_RXTEST:
1305 		case -LAGG_OPT_LACP_RXTEST:
1306 		case LAGG_OPT_LACP_STRICT:
1307 		case -LAGG_OPT_LACP_STRICT:
1308 		case LAGG_OPT_LACP_TIMEOUT:
1309 		case -LAGG_OPT_LACP_TIMEOUT:
1310 			valid = lacp = 1;
1311 			break;
1312 		default:
1313 			valid = lacp = 0;
1314 			break;
1315 		}
1316 
1317 		if (valid == 0 ||
1318 		    (lacp == 1 && sc->sc_proto != LAGG_PROTO_LACP)) {
1319 			/* Invalid combination of options specified. */
1320 			error = EINVAL;
1321 			LAGG_XUNLOCK(sc);
1322 			break;	/* Return from SIOCSLAGGOPTS. */
1323 		}
1324 
1325 		/*
1326 		 * Store new options into sc->sc_opts except for
1327 		 * FLOWIDSHIFT, RR and LACP options.
1328 		 */
1329 		if (lacp == 0) {
1330 			if (ro->ro_opts == LAGG_OPT_FLOWIDSHIFT)
1331 				sc->flowid_shift = ro->ro_flowid_shift;
1332 			else if (ro->ro_opts == LAGG_OPT_RR_LIMIT) {
1333 				if (sc->sc_proto != LAGG_PROTO_ROUNDROBIN ||
1334 				    ro->ro_bkt == 0) {
1335 					error = EINVAL;
1336 					LAGG_XUNLOCK(sc);
1337 					break;
1338 				}
1339 				sc->sc_stride = ro->ro_bkt;
1340 			} else if (ro->ro_opts > 0)
1341 				sc->sc_opts |= ro->ro_opts;
1342 			else
1343 				sc->sc_opts &= ~ro->ro_opts;
1344 		} else {
1345 			struct lacp_softc *lsc;
1346 			struct lacp_port *lp;
1347 
1348 			lsc = (struct lacp_softc *)sc->sc_psc;
1349 
1350 			switch (ro->ro_opts) {
1351 			case LAGG_OPT_LACP_TXTEST:
1352 				lsc->lsc_debug.lsc_tx_test = 1;
1353 				break;
1354 			case -LAGG_OPT_LACP_TXTEST:
1355 				lsc->lsc_debug.lsc_tx_test = 0;
1356 				break;
1357 			case LAGG_OPT_LACP_RXTEST:
1358 				lsc->lsc_debug.lsc_rx_test = 1;
1359 				break;
1360 			case -LAGG_OPT_LACP_RXTEST:
1361 				lsc->lsc_debug.lsc_rx_test = 0;
1362 				break;
1363 			case LAGG_OPT_LACP_STRICT:
1364 				lsc->lsc_strict_mode = 1;
1365 				break;
1366 			case -LAGG_OPT_LACP_STRICT:
1367 				lsc->lsc_strict_mode = 0;
1368 				break;
1369 			case LAGG_OPT_LACP_TIMEOUT:
1370 				LACP_LOCK(lsc);
1371         			LIST_FOREACH(lp, &lsc->lsc_ports, lp_next)
1372                         		lp->lp_state |= LACP_STATE_TIMEOUT;
1373 				LACP_UNLOCK(lsc);
1374 				lsc->lsc_fast_timeout = 1;
1375 				break;
1376 			case -LAGG_OPT_LACP_TIMEOUT:
1377 				LACP_LOCK(lsc);
1378         			LIST_FOREACH(lp, &lsc->lsc_ports, lp_next)
1379                         		lp->lp_state &= ~LACP_STATE_TIMEOUT;
1380 				LACP_UNLOCK(lsc);
1381 				lsc->lsc_fast_timeout = 0;
1382 				break;
1383 			}
1384 		}
1385 		LAGG_XUNLOCK(sc);
1386 		break;
1387 	case SIOCGLAGGFLAGS:
1388 		rf->rf_flags = 0;
1389 		LAGG_XLOCK(sc);
1390 		if (sc->sc_flags & MBUF_HASHFLAG_L2)
1391 			rf->rf_flags |= LAGG_F_HASHL2;
1392 		if (sc->sc_flags & MBUF_HASHFLAG_L3)
1393 			rf->rf_flags |= LAGG_F_HASHL3;
1394 		if (sc->sc_flags & MBUF_HASHFLAG_L4)
1395 			rf->rf_flags |= LAGG_F_HASHL4;
1396 		LAGG_XUNLOCK(sc);
1397 		break;
1398 	case SIOCSLAGGHASH:
1399 		error = priv_check(td, PRIV_NET_LAGG);
1400 		if (error)
1401 			break;
1402 		if ((rf->rf_flags & LAGG_F_HASHMASK) == 0) {
1403 			error = EINVAL;
1404 			break;
1405 		}
1406 		LAGG_XLOCK(sc);
1407 		sc->sc_flags = 0;
1408 		if (rf->rf_flags & LAGG_F_HASHL2)
1409 			sc->sc_flags |= MBUF_HASHFLAG_L2;
1410 		if (rf->rf_flags & LAGG_F_HASHL3)
1411 			sc->sc_flags |= MBUF_HASHFLAG_L3;
1412 		if (rf->rf_flags & LAGG_F_HASHL4)
1413 			sc->sc_flags |= MBUF_HASHFLAG_L4;
1414 		LAGG_XUNLOCK(sc);
1415 		break;
1416 	case SIOCGLAGGPORT:
1417 		if (rp->rp_portname[0] == '\0' ||
1418 		    (tpif = ifunit_ref(rp->rp_portname)) == NULL) {
1419 			error = EINVAL;
1420 			break;
1421 		}
1422 
1423 		LAGG_RLOCK();
1424 		if ((lp = (struct lagg_port *)tpif->if_lagg) == NULL ||
1425 		    lp->lp_softc != sc) {
1426 			error = ENOENT;
1427 			LAGG_RUNLOCK();
1428 			if_rele(tpif);
1429 			break;
1430 		}
1431 
1432 		lagg_port2req(lp, rp);
1433 		LAGG_RUNLOCK();
1434 		if_rele(tpif);
1435 		break;
1436 	case SIOCSLAGGPORT:
1437 		error = priv_check(td, PRIV_NET_LAGG);
1438 		if (error)
1439 			break;
1440 		if (rp->rp_portname[0] == '\0' ||
1441 		    (tpif = ifunit_ref(rp->rp_portname)) == NULL) {
1442 			error = EINVAL;
1443 			break;
1444 		}
1445 #ifdef INET6
1446 		/*
1447 		 * A laggport interface should not have inet6 address
1448 		 * because two interfaces with a valid link-local
1449 		 * scope zone must not be merged in any form.  This
1450 		 * restriction is needed to prevent violation of
1451 		 * link-local scope zone.  Attempts to add a laggport
1452 		 * interface which has inet6 addresses triggers
1453 		 * removal of all inet6 addresses on the member
1454 		 * interface.
1455 		 */
1456 		if (in6ifa_llaonifp(tpif)) {
1457 			in6_ifdetach(tpif);
1458 				if_printf(sc->sc_ifp,
1459 				    "IPv6 addresses on %s have been removed "
1460 				    "before adding it as a member to prevent "
1461 				    "IPv6 address scope violation.\n",
1462 				    tpif->if_xname);
1463 		}
1464 #endif
1465 		oldmtu = ifp->if_mtu;
1466 		LAGG_XLOCK(sc);
1467 		error = lagg_port_create(sc, tpif);
1468 		LAGG_XUNLOCK(sc);
1469 		if_rele(tpif);
1470 
1471 		/*
1472 		 * LAGG MTU may change during addition of the first port.
1473 		 * If it did, do network layer specific procedure.
1474 		 */
1475 		if (ifp->if_mtu != oldmtu) {
1476 #ifdef INET6
1477 			nd6_setmtu(ifp);
1478 #endif
1479 			rt_updatemtu(ifp);
1480 		}
1481 
1482 		VLAN_CAPABILITIES(ifp);
1483 		break;
1484 	case SIOCSLAGGDELPORT:
1485 		error = priv_check(td, PRIV_NET_LAGG);
1486 		if (error)
1487 			break;
1488 		if (rp->rp_portname[0] == '\0' ||
1489 		    (tpif = ifunit_ref(rp->rp_portname)) == NULL) {
1490 			error = EINVAL;
1491 			break;
1492 		}
1493 
1494 		LAGG_XLOCK(sc);
1495 		if ((lp = (struct lagg_port *)tpif->if_lagg) == NULL ||
1496 		    lp->lp_softc != sc) {
1497 			error = ENOENT;
1498 			LAGG_XUNLOCK(sc);
1499 			if_rele(tpif);
1500 			break;
1501 		}
1502 
1503 		error = lagg_port_destroy(lp, 1);
1504 		LAGG_XUNLOCK(sc);
1505 		if_rele(tpif);
1506 		VLAN_CAPABILITIES(ifp);
1507 		break;
1508 	case SIOCSIFFLAGS:
1509 		/* Set flags on ports too */
1510 		LAGG_XLOCK(sc);
1511 		CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
1512 			lagg_setflags(lp, 1);
1513 		}
1514 
1515 		if (!(ifp->if_flags & IFF_UP) &&
1516 		    (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
1517 			/*
1518 			 * If interface is marked down and it is running,
1519 			 * then stop and disable it.
1520 			 */
1521 			lagg_stop(sc);
1522 			LAGG_XUNLOCK(sc);
1523 		} else if ((ifp->if_flags & IFF_UP) &&
1524 		    !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
1525 			/*
1526 			 * If interface is marked up and it is stopped, then
1527 			 * start it.
1528 			 */
1529 			LAGG_XUNLOCK(sc);
1530 			(*ifp->if_init)(sc);
1531 		} else
1532 			LAGG_XUNLOCK(sc);
1533 		break;
1534 	case SIOCADDMULTI:
1535 	case SIOCDELMULTI:
1536 		LAGG_XLOCK(sc);
1537 		CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
1538 			lagg_clrmulti(lp);
1539 			lagg_setmulti(lp);
1540 		}
1541 		LAGG_XUNLOCK(sc);
1542 		error = 0;
1543 		break;
1544 	case SIOCSIFMEDIA:
1545 	case SIOCGIFMEDIA:
1546 		error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd);
1547 		break;
1548 
1549 	case SIOCSIFCAP:
1550 		LAGG_XLOCK(sc);
1551 		CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
1552 			if (lp->lp_ioctl != NULL)
1553 				(*lp->lp_ioctl)(lp->lp_ifp, cmd, data);
1554 		}
1555 		lagg_capabilities(sc);
1556 		LAGG_XUNLOCK(sc);
1557 		VLAN_CAPABILITIES(ifp);
1558 		error = 0;
1559 		break;
1560 
1561 	case SIOCSIFMTU:
1562 		LAGG_XLOCK(sc);
1563 		CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
1564 			if (lp->lp_ioctl != NULL)
1565 				error = (*lp->lp_ioctl)(lp->lp_ifp, cmd, data);
1566 			else
1567 				error = EINVAL;
1568 			if (error != 0) {
1569 				if_printf(ifp,
1570 				    "failed to change MTU to %d on port %s, "
1571 				    "reverting all ports to original MTU (%d)\n",
1572 				    ifr->ifr_mtu, lp->lp_ifp->if_xname, ifp->if_mtu);
1573 				break;
1574 			}
1575 		}
1576 		if (error == 0) {
1577 			ifp->if_mtu = ifr->ifr_mtu;
1578 		} else {
1579 			/* set every port back to the original MTU */
1580 			ifr->ifr_mtu = ifp->if_mtu;
1581 			CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
1582 				if (lp->lp_ioctl != NULL)
1583 					(*lp->lp_ioctl)(lp->lp_ifp, cmd, data);
1584 			}
1585 		}
1586 		LAGG_XUNLOCK(sc);
1587 		break;
1588 
1589 	default:
1590 		error = ether_ioctl(ifp, cmd, data);
1591 		break;
1592 	}
1593 	return (error);
1594 }
1595 
1596 #if defined(KERN_TLS) || defined(RATELIMIT)
1597 static inline struct lagg_snd_tag *
1598 mst_to_lst(struct m_snd_tag *mst)
1599 {
1600 
1601 	return (__containerof(mst, struct lagg_snd_tag, com));
1602 }
1603 
1604 /*
1605  * Look up the port used by a specific flow.  This only works for lagg
1606  * protocols with deterministic port mappings (e.g. not roundrobin).
1607  * In addition protocols which use a hash to map flows to ports must
1608  * be configured to use the mbuf flowid rather than hashing packet
1609  * contents.
1610  */
1611 static struct lagg_port *
1612 lookup_snd_tag_port(struct ifnet *ifp, uint32_t flowid, uint32_t flowtype)
1613 {
1614 	struct lagg_softc *sc;
1615 	struct lagg_port *lp;
1616 	struct lagg_lb *lb;
1617 	uint32_t p;
1618 
1619 	sc = ifp->if_softc;
1620 
1621 	switch (sc->sc_proto) {
1622 	case LAGG_PROTO_FAILOVER:
1623 		return (lagg_link_active(sc, sc->sc_primary));
1624 	case LAGG_PROTO_LOADBALANCE:
1625 		if ((sc->sc_opts & LAGG_OPT_USE_FLOWID) == 0 ||
1626 		    flowtype == M_HASHTYPE_NONE)
1627 			return (NULL);
1628 		p = flowid >> sc->flowid_shift;
1629 		p %= sc->sc_count;
1630 		lb = (struct lagg_lb *)sc->sc_psc;
1631 		lp = lb->lb_ports[p];
1632 		return (lagg_link_active(sc, lp));
1633 	case LAGG_PROTO_LACP:
1634 		if ((sc->sc_opts & LAGG_OPT_USE_FLOWID) == 0 ||
1635 		    flowtype == M_HASHTYPE_NONE)
1636 			return (NULL);
1637 		return (lacp_select_tx_port_by_hash(sc, flowid));
1638 	default:
1639 		return (NULL);
1640 	}
1641 }
1642 
1643 static int
1644 lagg_snd_tag_alloc(struct ifnet *ifp,
1645     union if_snd_tag_alloc_params *params,
1646     struct m_snd_tag **ppmt)
1647 {
1648 	struct lagg_snd_tag *lst;
1649 	struct lagg_softc *sc;
1650 	struct lagg_port *lp;
1651 	struct ifnet *lp_ifp;
1652 	int error;
1653 
1654 	sc = ifp->if_softc;
1655 
1656 	LAGG_RLOCK();
1657 	lp = lookup_snd_tag_port(ifp, params->hdr.flowid, params->hdr.flowtype);
1658 	if (lp == NULL) {
1659 		LAGG_RUNLOCK();
1660 		return (EOPNOTSUPP);
1661 	}
1662 	if (lp->lp_ifp == NULL || lp->lp_ifp->if_snd_tag_alloc == NULL) {
1663 		LAGG_RUNLOCK();
1664 		return (EOPNOTSUPP);
1665 	}
1666 	lp_ifp = lp->lp_ifp;
1667 	if_ref(lp_ifp);
1668 	LAGG_RUNLOCK();
1669 
1670 	lst = malloc(sizeof(*lst), M_LAGG, M_NOWAIT);
1671 	if (lst == NULL) {
1672 		if_rele(lp_ifp);
1673 		return (ENOMEM);
1674 	}
1675 
1676 	error = lp_ifp->if_snd_tag_alloc(lp_ifp, params, &lst->tag);
1677 	if_rele(lp_ifp);
1678 	if (error) {
1679 		free(lst, M_LAGG);
1680 		return (error);
1681 	}
1682 
1683 	m_snd_tag_init(&lst->com, ifp);
1684 
1685 	*ppmt = &lst->com;
1686 	return (0);
1687 }
1688 
1689 static int
1690 lagg_snd_tag_modify(struct m_snd_tag *mst,
1691     union if_snd_tag_modify_params *params)
1692 {
1693 	struct lagg_snd_tag *lst;
1694 
1695 	lst = mst_to_lst(mst);
1696 	return (lst->tag->ifp->if_snd_tag_modify(lst->tag, params));
1697 }
1698 
1699 static int
1700 lagg_snd_tag_query(struct m_snd_tag *mst,
1701     union if_snd_tag_query_params *params)
1702 {
1703 	struct lagg_snd_tag *lst;
1704 
1705 	lst = mst_to_lst(mst);
1706 	return (lst->tag->ifp->if_snd_tag_query(lst->tag, params));
1707 }
1708 
1709 static void
1710 lagg_snd_tag_free(struct m_snd_tag *mst)
1711 {
1712 	struct lagg_snd_tag *lst;
1713 
1714 	lst = mst_to_lst(mst);
1715 	m_snd_tag_rele(lst->tag);
1716 	free(lst, M_LAGG);
1717 }
1718 
1719 static void
1720 lagg_ratelimit_query(struct ifnet *ifp __unused, struct if_ratelimit_query_results *q)
1721 {
1722 	/*
1723 	 * For lagg, we have an indirect
1724 	 * interface. The caller needs to
1725 	 * get a ratelimit tag on the actual
1726 	 * interface the flow will go on.
1727 	 */
1728 	q->rate_table = NULL;
1729 	q->flags = RT_IS_INDIRECT;
1730 	q->max_flows = 0;
1731 	q->number_of_rates = 0;
1732 }
1733 #endif
1734 
1735 static int
1736 lagg_setmulti(struct lagg_port *lp)
1737 {
1738 	struct lagg_softc *sc = lp->lp_softc;
1739 	struct ifnet *ifp = lp->lp_ifp;
1740 	struct ifnet *scifp = sc->sc_ifp;
1741 	struct lagg_mc *mc;
1742 	struct ifmultiaddr *ifma;
1743 	int error;
1744 
1745 	IF_ADDR_WLOCK(scifp);
1746 	CK_STAILQ_FOREACH(ifma, &scifp->if_multiaddrs, ifma_link) {
1747 		if (ifma->ifma_addr->sa_family != AF_LINK)
1748 			continue;
1749 		mc = malloc(sizeof(struct lagg_mc), M_LAGG, M_NOWAIT);
1750 		if (mc == NULL) {
1751 			IF_ADDR_WUNLOCK(scifp);
1752 			return (ENOMEM);
1753 		}
1754 		bcopy(ifma->ifma_addr, &mc->mc_addr,
1755 		    ifma->ifma_addr->sa_len);
1756 		mc->mc_addr.sdl_index = ifp->if_index;
1757 		mc->mc_ifma = NULL;
1758 		SLIST_INSERT_HEAD(&lp->lp_mc_head, mc, mc_entries);
1759 	}
1760 	IF_ADDR_WUNLOCK(scifp);
1761 	SLIST_FOREACH (mc, &lp->lp_mc_head, mc_entries) {
1762 		error = if_addmulti(ifp,
1763 		    (struct sockaddr *)&mc->mc_addr, &mc->mc_ifma);
1764 		if (error)
1765 			return (error);
1766 	}
1767 	return (0);
1768 }
1769 
1770 static int
1771 lagg_clrmulti(struct lagg_port *lp)
1772 {
1773 	struct lagg_mc *mc;
1774 
1775 	LAGG_XLOCK_ASSERT(lp->lp_softc);
1776 	while ((mc = SLIST_FIRST(&lp->lp_mc_head)) != NULL) {
1777 		SLIST_REMOVE(&lp->lp_mc_head, mc, lagg_mc, mc_entries);
1778 		if (mc->mc_ifma && lp->lp_detaching == 0)
1779 			if_delmulti_ifma(mc->mc_ifma);
1780 		free(mc, M_LAGG);
1781 	}
1782 	return (0);
1783 }
1784 
1785 static int
1786 lagg_setcaps(struct lagg_port *lp, int cap)
1787 {
1788 	struct ifreq ifr;
1789 
1790 	if (lp->lp_ifp->if_capenable == cap)
1791 		return (0);
1792 	if (lp->lp_ioctl == NULL)
1793 		return (ENXIO);
1794 	ifr.ifr_reqcap = cap;
1795 	return ((*lp->lp_ioctl)(lp->lp_ifp, SIOCSIFCAP, (caddr_t)&ifr));
1796 }
1797 
1798 /* Handle a ref counted flag that should be set on the lagg port as well */
1799 static int
1800 lagg_setflag(struct lagg_port *lp, int flag, int status,
1801     int (*func)(struct ifnet *, int))
1802 {
1803 	struct lagg_softc *sc = lp->lp_softc;
1804 	struct ifnet *scifp = sc->sc_ifp;
1805 	struct ifnet *ifp = lp->lp_ifp;
1806 	int error;
1807 
1808 	LAGG_XLOCK_ASSERT(sc);
1809 
1810 	status = status ? (scifp->if_flags & flag) : 0;
1811 	/* Now "status" contains the flag value or 0 */
1812 
1813 	/*
1814 	 * See if recorded ports status is different from what
1815 	 * we want it to be.  If it is, flip it.  We record ports
1816 	 * status in lp_ifflags so that we won't clear ports flag
1817 	 * we haven't set.  In fact, we don't clear or set ports
1818 	 * flags directly, but get or release references to them.
1819 	 * That's why we can be sure that recorded flags still are
1820 	 * in accord with actual ports flags.
1821 	 */
1822 	if (status != (lp->lp_ifflags & flag)) {
1823 		error = (*func)(ifp, status);
1824 		if (error)
1825 			return (error);
1826 		lp->lp_ifflags &= ~flag;
1827 		lp->lp_ifflags |= status;
1828 	}
1829 	return (0);
1830 }
1831 
1832 /*
1833  * Handle IFF_* flags that require certain changes on the lagg port
1834  * if "status" is true, update ports flags respective to the lagg
1835  * if "status" is false, forcedly clear the flags set on port.
1836  */
1837 static int
1838 lagg_setflags(struct lagg_port *lp, int status)
1839 {
1840 	int error, i;
1841 
1842 	for (i = 0; lagg_pflags[i].flag; i++) {
1843 		error = lagg_setflag(lp, lagg_pflags[i].flag,
1844 		    status, lagg_pflags[i].func);
1845 		if (error)
1846 			return (error);
1847 	}
1848 	return (0);
1849 }
1850 
1851 static int
1852 lagg_transmit(struct ifnet *ifp, struct mbuf *m)
1853 {
1854 	struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
1855 	int error;
1856 
1857 #if defined(KERN_TLS) || defined(RATELIMIT)
1858 	if (m->m_pkthdr.csum_flags & CSUM_SND_TAG)
1859 		MPASS(m->m_pkthdr.snd_tag->ifp == ifp);
1860 #endif
1861 	LAGG_RLOCK();
1862 	/* We need a Tx algorithm and at least one port */
1863 	if (sc->sc_proto == LAGG_PROTO_NONE || sc->sc_count == 0) {
1864 		LAGG_RUNLOCK();
1865 		m_freem(m);
1866 		if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1867 		return (ENXIO);
1868 	}
1869 
1870 	ETHER_BPF_MTAP(ifp, m);
1871 
1872 	error = lagg_proto_start(sc, m);
1873 	LAGG_RUNLOCK();
1874 
1875 	if (error != 0)
1876 		if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
1877 
1878 	return (error);
1879 }
1880 
1881 /*
1882  * The ifp->if_qflush entry point for lagg(4) is no-op.
1883  */
1884 static void
1885 lagg_qflush(struct ifnet *ifp __unused)
1886 {
1887 }
1888 
1889 static struct mbuf *
1890 lagg_input(struct ifnet *ifp, struct mbuf *m)
1891 {
1892 	struct lagg_port *lp = ifp->if_lagg;
1893 	struct lagg_softc *sc = lp->lp_softc;
1894 	struct ifnet *scifp = sc->sc_ifp;
1895 
1896 	LAGG_RLOCK();
1897 	if ((scifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
1898 	    lp->lp_detaching != 0 ||
1899 	    sc->sc_proto == LAGG_PROTO_NONE) {
1900 		LAGG_RUNLOCK();
1901 		m_freem(m);
1902 		return (NULL);
1903 	}
1904 
1905 	ETHER_BPF_MTAP(scifp, m);
1906 
1907 	m = lagg_proto_input(sc, lp, m);
1908 	if (m != NULL && (scifp->if_flags & IFF_MONITOR) != 0) {
1909 		m_freem(m);
1910 		m = NULL;
1911 	}
1912 
1913 	LAGG_RUNLOCK();
1914 	return (m);
1915 }
1916 
1917 static int
1918 lagg_media_change(struct ifnet *ifp)
1919 {
1920 	struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
1921 
1922 	if (sc->sc_ifflags & IFF_DEBUG)
1923 		printf("%s\n", __func__);
1924 
1925 	/* Ignore */
1926 	return (0);
1927 }
1928 
1929 static void
1930 lagg_media_status(struct ifnet *ifp, struct ifmediareq *imr)
1931 {
1932 	struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
1933 	struct lagg_port *lp;
1934 
1935 	imr->ifm_status = IFM_AVALID;
1936 	imr->ifm_active = IFM_ETHER | IFM_AUTO;
1937 
1938 	LAGG_RLOCK();
1939 	CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
1940 		if (LAGG_PORTACTIVE(lp))
1941 			imr->ifm_status |= IFM_ACTIVE;
1942 	}
1943 	LAGG_RUNLOCK();
1944 }
1945 
1946 static void
1947 lagg_linkstate(struct lagg_softc *sc)
1948 {
1949 	struct lagg_port *lp;
1950 	int new_link = LINK_STATE_DOWN;
1951 	uint64_t speed;
1952 
1953 	LAGG_XLOCK_ASSERT(sc);
1954 
1955 	/* LACP handles link state itself */
1956 	if (sc->sc_proto == LAGG_PROTO_LACP)
1957 		return;
1958 
1959 	/* Our link is considered up if at least one of our ports is active */
1960 	LAGG_RLOCK();
1961 	CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
1962 		if (lp->lp_ifp->if_link_state == LINK_STATE_UP) {
1963 			new_link = LINK_STATE_UP;
1964 			break;
1965 		}
1966 	}
1967 	LAGG_RUNLOCK();
1968 	if_link_state_change(sc->sc_ifp, new_link);
1969 
1970 	/* Update if_baudrate to reflect the max possible speed */
1971 	switch (sc->sc_proto) {
1972 		case LAGG_PROTO_FAILOVER:
1973 			sc->sc_ifp->if_baudrate = sc->sc_primary != NULL ?
1974 			    sc->sc_primary->lp_ifp->if_baudrate : 0;
1975 			break;
1976 		case LAGG_PROTO_ROUNDROBIN:
1977 		case LAGG_PROTO_LOADBALANCE:
1978 		case LAGG_PROTO_BROADCAST:
1979 			speed = 0;
1980 			LAGG_RLOCK();
1981 			CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
1982 				speed += lp->lp_ifp->if_baudrate;
1983 			LAGG_RUNLOCK();
1984 			sc->sc_ifp->if_baudrate = speed;
1985 			break;
1986 		case LAGG_PROTO_LACP:
1987 			/* LACP updates if_baudrate itself */
1988 			break;
1989 	}
1990 }
1991 
1992 static void
1993 lagg_port_state(struct ifnet *ifp, int state)
1994 {
1995 	struct lagg_port *lp = (struct lagg_port *)ifp->if_lagg;
1996 	struct lagg_softc *sc = NULL;
1997 
1998 	if (lp != NULL)
1999 		sc = lp->lp_softc;
2000 	if (sc == NULL)
2001 		return;
2002 
2003 	LAGG_XLOCK(sc);
2004 	lagg_linkstate(sc);
2005 	lagg_proto_linkstate(sc, lp);
2006 	LAGG_XUNLOCK(sc);
2007 }
2008 
2009 struct lagg_port *
2010 lagg_link_active(struct lagg_softc *sc, struct lagg_port *lp)
2011 {
2012 	struct lagg_port *lp_next, *rval = NULL;
2013 
2014 	/*
2015 	 * Search a port which reports an active link state.
2016 	 */
2017 
2018 #ifdef INVARIANTS
2019 	/*
2020 	 * This is called with either LAGG_RLOCK() held or
2021 	 * LAGG_XLOCK(sc) held.
2022 	 */
2023 	if (!in_epoch(net_epoch_preempt))
2024 		LAGG_XLOCK_ASSERT(sc);
2025 #endif
2026 
2027 	if (lp == NULL)
2028 		goto search;
2029 	if (LAGG_PORTACTIVE(lp)) {
2030 		rval = lp;
2031 		goto found;
2032 	}
2033 	if ((lp_next = CK_SLIST_NEXT(lp, lp_entries)) != NULL &&
2034 	    LAGG_PORTACTIVE(lp_next)) {
2035 		rval = lp_next;
2036 		goto found;
2037 	}
2038 
2039 search:
2040 	CK_SLIST_FOREACH(lp_next, &sc->sc_ports, lp_entries) {
2041 		if (LAGG_PORTACTIVE(lp_next)) {
2042 			return (lp_next);
2043 		}
2044 	}
2045 found:
2046 	return (rval);
2047 }
2048 
2049 int
2050 lagg_enqueue(struct ifnet *ifp, struct mbuf *m)
2051 {
2052 
2053 #if defined(KERN_TLS) || defined(RATELIMIT)
2054 	if (m->m_pkthdr.csum_flags & CSUM_SND_TAG) {
2055 		struct lagg_snd_tag *lst;
2056 		struct m_snd_tag *mst;
2057 
2058 		mst = m->m_pkthdr.snd_tag;
2059 		lst = mst_to_lst(mst);
2060 		if (lst->tag->ifp != ifp) {
2061 			m_freem(m);
2062 			return (EAGAIN);
2063 		}
2064 		m->m_pkthdr.snd_tag = m_snd_tag_ref(lst->tag);
2065 		m_snd_tag_rele(mst);
2066 	}
2067 #endif
2068 	return (ifp->if_transmit)(ifp, m);
2069 }
2070 
2071 /*
2072  * Simple round robin aggregation
2073  */
2074 static void
2075 lagg_rr_attach(struct lagg_softc *sc)
2076 {
2077 	sc->sc_seq = 0;
2078 	sc->sc_stride = 1;
2079 }
2080 
2081 static int
2082 lagg_rr_start(struct lagg_softc *sc, struct mbuf *m)
2083 {
2084 	struct lagg_port *lp;
2085 	uint32_t p;
2086 
2087 	p = atomic_fetchadd_32(&sc->sc_seq, 1);
2088 	p /= sc->sc_stride;
2089 	p %= sc->sc_count;
2090 	lp = CK_SLIST_FIRST(&sc->sc_ports);
2091 
2092 	while (p--)
2093 		lp = CK_SLIST_NEXT(lp, lp_entries);
2094 
2095 	/*
2096 	 * Check the port's link state. This will return the next active
2097 	 * port if the link is down or the port is NULL.
2098 	 */
2099 	if ((lp = lagg_link_active(sc, lp)) == NULL) {
2100 		m_freem(m);
2101 		return (ENETDOWN);
2102 	}
2103 
2104 	/* Send mbuf */
2105 	return (lagg_enqueue(lp->lp_ifp, m));
2106 }
2107 
2108 static struct mbuf *
2109 lagg_rr_input(struct lagg_softc *sc, struct lagg_port *lp, struct mbuf *m)
2110 {
2111 	struct ifnet *ifp = sc->sc_ifp;
2112 
2113 	/* Just pass in the packet to our lagg device */
2114 	m->m_pkthdr.rcvif = ifp;
2115 
2116 	return (m);
2117 }
2118 
2119 /*
2120  * Broadcast mode
2121  */
2122 static int
2123 lagg_bcast_start(struct lagg_softc *sc, struct mbuf *m)
2124 {
2125 	int active_ports = 0;
2126 	int errors = 0;
2127 	int ret;
2128 	struct lagg_port *lp, *last = NULL;
2129 	struct mbuf *m0;
2130 
2131 	LAGG_RLOCK_ASSERT();
2132 	CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
2133 		if (!LAGG_PORTACTIVE(lp))
2134 			continue;
2135 
2136 		active_ports++;
2137 
2138 		if (last != NULL) {
2139 			m0 = m_copym(m, 0, M_COPYALL, M_NOWAIT);
2140 			if (m0 == NULL) {
2141 				ret = ENOBUFS;
2142 				errors++;
2143 				break;
2144 			}
2145 
2146 			ret = lagg_enqueue(last->lp_ifp, m0);
2147 			if (ret != 0)
2148 				errors++;
2149 		}
2150 		last = lp;
2151 	}
2152 
2153 	if (last == NULL) {
2154 		m_freem(m);
2155 		return (ENOENT);
2156 	}
2157 	if ((last = lagg_link_active(sc, last)) == NULL) {
2158 		m_freem(m);
2159 		return (ENETDOWN);
2160 	}
2161 
2162 	ret = lagg_enqueue(last->lp_ifp, m);
2163 	if (ret != 0)
2164 		errors++;
2165 
2166 	if (errors == 0)
2167 		return (ret);
2168 
2169 	return (0);
2170 }
2171 
2172 static struct mbuf*
2173 lagg_bcast_input(struct lagg_softc *sc, struct lagg_port *lp, struct mbuf *m)
2174 {
2175 	struct ifnet *ifp = sc->sc_ifp;
2176 
2177 	/* Just pass in the packet to our lagg device */
2178 	m->m_pkthdr.rcvif = ifp;
2179 	return (m);
2180 }
2181 
2182 /*
2183  * Active failover
2184  */
2185 static int
2186 lagg_fail_start(struct lagg_softc *sc, struct mbuf *m)
2187 {
2188 	struct lagg_port *lp;
2189 
2190 	/* Use the master port if active or the next available port */
2191 	if ((lp = lagg_link_active(sc, sc->sc_primary)) == NULL) {
2192 		m_freem(m);
2193 		return (ENETDOWN);
2194 	}
2195 
2196 	/* Send mbuf */
2197 	return (lagg_enqueue(lp->lp_ifp, m));
2198 }
2199 
2200 static struct mbuf *
2201 lagg_fail_input(struct lagg_softc *sc, struct lagg_port *lp, struct mbuf *m)
2202 {
2203 	struct ifnet *ifp = sc->sc_ifp;
2204 	struct lagg_port *tmp_tp;
2205 
2206 	if (lp == sc->sc_primary || V_lagg_failover_rx_all) {
2207 		m->m_pkthdr.rcvif = ifp;
2208 		return (m);
2209 	}
2210 
2211 	if (!LAGG_PORTACTIVE(sc->sc_primary)) {
2212 		tmp_tp = lagg_link_active(sc, sc->sc_primary);
2213 		/*
2214 		 * If tmp_tp is null, we've received a packet when all
2215 		 * our links are down. Weird, but process it anyways.
2216 		 */
2217 		if ((tmp_tp == NULL || tmp_tp == lp)) {
2218 			m->m_pkthdr.rcvif = ifp;
2219 			return (m);
2220 		}
2221 	}
2222 
2223 	m_freem(m);
2224 	return (NULL);
2225 }
2226 
2227 /*
2228  * Loadbalancing
2229  */
2230 static void
2231 lagg_lb_attach(struct lagg_softc *sc)
2232 {
2233 	struct lagg_port *lp;
2234 	struct lagg_lb *lb;
2235 
2236 	LAGG_XLOCK_ASSERT(sc);
2237 	lb = malloc(sizeof(struct lagg_lb), M_LAGG, M_WAITOK | M_ZERO);
2238 	lb->lb_key = m_ether_tcpip_hash_init();
2239 	sc->sc_psc = lb;
2240 
2241 	CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
2242 		lagg_lb_port_create(lp);
2243 }
2244 
2245 static void
2246 lagg_lb_detach(struct lagg_softc *sc)
2247 {
2248 	struct lagg_lb *lb;
2249 
2250 	lb = (struct lagg_lb *)sc->sc_psc;
2251 	if (lb != NULL)
2252 		free(lb, M_LAGG);
2253 }
2254 
2255 static int
2256 lagg_lb_porttable(struct lagg_softc *sc, struct lagg_port *lp)
2257 {
2258 	struct lagg_lb *lb = (struct lagg_lb *)sc->sc_psc;
2259 	struct lagg_port *lp_next;
2260 	int i = 0, rv;
2261 
2262 	rv = 0;
2263 	bzero(&lb->lb_ports, sizeof(lb->lb_ports));
2264 	LAGG_XLOCK_ASSERT(sc);
2265 	CK_SLIST_FOREACH(lp_next, &sc->sc_ports, lp_entries) {
2266 		if (lp_next == lp)
2267 			continue;
2268 		if (i >= LAGG_MAX_PORTS) {
2269 			rv = EINVAL;
2270 			break;
2271 		}
2272 		if (sc->sc_ifflags & IFF_DEBUG)
2273 			printf("%s: port %s at index %d\n",
2274 			    sc->sc_ifname, lp_next->lp_ifp->if_xname, i);
2275 		lb->lb_ports[i++] = lp_next;
2276 	}
2277 
2278 	return (rv);
2279 }
2280 
2281 static int
2282 lagg_lb_port_create(struct lagg_port *lp)
2283 {
2284 	struct lagg_softc *sc = lp->lp_softc;
2285 	return (lagg_lb_porttable(sc, NULL));
2286 }
2287 
2288 static void
2289 lagg_lb_port_destroy(struct lagg_port *lp)
2290 {
2291 	struct lagg_softc *sc = lp->lp_softc;
2292 	lagg_lb_porttable(sc, lp);
2293 }
2294 
2295 static int
2296 lagg_lb_start(struct lagg_softc *sc, struct mbuf *m)
2297 {
2298 	struct lagg_lb *lb = (struct lagg_lb *)sc->sc_psc;
2299 	struct lagg_port *lp = NULL;
2300 	uint32_t p = 0;
2301 
2302 	if ((sc->sc_opts & LAGG_OPT_USE_FLOWID) &&
2303 	    M_HASHTYPE_GET(m) != M_HASHTYPE_NONE)
2304 		p = m->m_pkthdr.flowid >> sc->flowid_shift;
2305 	else
2306 		p = m_ether_tcpip_hash(sc->sc_flags, m, lb->lb_key);
2307 	p %= sc->sc_count;
2308 	lp = lb->lb_ports[p];
2309 
2310 	/*
2311 	 * Check the port's link state. This will return the next active
2312 	 * port if the link is down or the port is NULL.
2313 	 */
2314 	if ((lp = lagg_link_active(sc, lp)) == NULL) {
2315 		m_freem(m);
2316 		return (ENETDOWN);
2317 	}
2318 
2319 	/* Send mbuf */
2320 	return (lagg_enqueue(lp->lp_ifp, m));
2321 }
2322 
2323 static struct mbuf *
2324 lagg_lb_input(struct lagg_softc *sc, struct lagg_port *lp, struct mbuf *m)
2325 {
2326 	struct ifnet *ifp = sc->sc_ifp;
2327 
2328 	/* Just pass in the packet to our lagg device */
2329 	m->m_pkthdr.rcvif = ifp;
2330 
2331 	return (m);
2332 }
2333 
2334 /*
2335  * 802.3ad LACP
2336  */
2337 static void
2338 lagg_lacp_attach(struct lagg_softc *sc)
2339 {
2340 	struct lagg_port *lp;
2341 
2342 	lacp_attach(sc);
2343 	LAGG_XLOCK_ASSERT(sc);
2344 	CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
2345 		lacp_port_create(lp);
2346 }
2347 
2348 static void
2349 lagg_lacp_detach(struct lagg_softc *sc)
2350 {
2351 	struct lagg_port *lp;
2352 	void *psc;
2353 
2354 	LAGG_XLOCK_ASSERT(sc);
2355 	CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
2356 		lacp_port_destroy(lp);
2357 
2358 	psc = sc->sc_psc;
2359 	sc->sc_psc = NULL;
2360 	lacp_detach(psc);
2361 }
2362 
2363 static void
2364 lagg_lacp_lladdr(struct lagg_softc *sc)
2365 {
2366 	struct lagg_port *lp;
2367 
2368 	LAGG_SXLOCK_ASSERT(sc);
2369 
2370 	/* purge all the lacp ports */
2371 	CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
2372 		lacp_port_destroy(lp);
2373 
2374 	/* add them back in */
2375 	CK_SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
2376 		lacp_port_create(lp);
2377 }
2378 
2379 static int
2380 lagg_lacp_start(struct lagg_softc *sc, struct mbuf *m)
2381 {
2382 	struct lagg_port *lp;
2383 
2384 	lp = lacp_select_tx_port(sc, m);
2385 	if (lp == NULL) {
2386 		m_freem(m);
2387 		return (ENETDOWN);
2388 	}
2389 
2390 	/* Send mbuf */
2391 	return (lagg_enqueue(lp->lp_ifp, m));
2392 }
2393 
2394 static struct mbuf *
2395 lagg_lacp_input(struct lagg_softc *sc, struct lagg_port *lp, struct mbuf *m)
2396 {
2397 	struct ifnet *ifp = sc->sc_ifp;
2398 	struct ether_header *eh;
2399 	u_short etype;
2400 
2401 	eh = mtod(m, struct ether_header *);
2402 	etype = ntohs(eh->ether_type);
2403 
2404 	/* Tap off LACP control messages */
2405 	if ((m->m_flags & M_VLANTAG) == 0 && etype == ETHERTYPE_SLOW) {
2406 		m = lacp_input(lp, m);
2407 		if (m == NULL)
2408 			return (NULL);
2409 	}
2410 
2411 	/*
2412 	 * If the port is not collecting or not in the active aggregator then
2413 	 * free and return.
2414 	 */
2415 	if (lacp_iscollecting(lp) == 0 || lacp_isactive(lp) == 0) {
2416 		m_freem(m);
2417 		return (NULL);
2418 	}
2419 
2420 	m->m_pkthdr.rcvif = ifp;
2421 	return (m);
2422 }
2423 
2424