FreeBSD/Linux Kernel Cross Reference
sys/net/if_lagg.c
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 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 #include <sys/cdefs.h>
21 __FBSDID("$FreeBSD: releng/8.1/sys/net/if_lagg.c 208526 2010-05-25 02:36:06Z thompsa $");
22
23 #include "opt_inet.h"
24 #include "opt_inet6.h"
25
26 #include <sys/param.h>
27 #include <sys/kernel.h>
28 #include <sys/malloc.h>
29 #include <sys/mbuf.h>
30 #include <sys/queue.h>
31 #include <sys/socket.h>
32 #include <sys/sockio.h>
33 #include <sys/sysctl.h>
34 #include <sys/module.h>
35 #include <sys/priv.h>
36 #include <sys/systm.h>
37 #include <sys/proc.h>
38 #include <sys/hash.h>
39 #include <sys/lock.h>
40 #include <sys/rwlock.h>
41 #include <sys/taskqueue.h>
42
43 #include <net/ethernet.h>
44 #include <net/if.h>
45 #include <net/if_clone.h>
46 #include <net/if_arp.h>
47 #include <net/if_dl.h>
48 #include <net/if_llc.h>
49 #include <net/if_media.h>
50 #include <net/if_types.h>
51 #include <net/if_var.h>
52 #include <net/bpf.h>
53
54 #ifdef INET
55 #include <netinet/in.h>
56 #include <netinet/in_systm.h>
57 #include <netinet/if_ether.h>
58 #include <netinet/ip.h>
59 #endif
60
61 #ifdef INET6
62 #include <netinet/ip6.h>
63 #endif
64
65 #include <net/if_vlan_var.h>
66 #include <net/if_lagg.h>
67 #include <net/ieee8023ad_lacp.h>
68
69 /* Special flags we should propagate to the lagg ports. */
70 static struct {
71 int flag;
72 int (*func)(struct ifnet *, int);
73 } lagg_pflags[] = {
74 {IFF_PROMISC, ifpromisc},
75 {IFF_ALLMULTI, if_allmulti},
76 {0, NULL}
77 };
78
79 SLIST_HEAD(__trhead, lagg_softc) lagg_list; /* list of laggs */
80 static struct mtx lagg_list_mtx;
81 eventhandler_tag lagg_detach_cookie = NULL;
82
83 static int lagg_clone_create(struct if_clone *, int, caddr_t);
84 static void lagg_clone_destroy(struct ifnet *);
85 static void lagg_lladdr(struct lagg_softc *, uint8_t *);
86 static void lagg_capabilities(struct lagg_softc *);
87 static void lagg_port_lladdr(struct lagg_port *, uint8_t *);
88 static void lagg_port_setlladdr(void *, int);
89 static int lagg_port_create(struct lagg_softc *, struct ifnet *);
90 static int lagg_port_destroy(struct lagg_port *, int);
91 static struct mbuf *lagg_input(struct ifnet *, struct mbuf *);
92 static void lagg_linkstate(struct lagg_softc *);
93 static void lagg_port_state(struct ifnet *, int);
94 static int lagg_port_ioctl(struct ifnet *, u_long, caddr_t);
95 static int lagg_port_output(struct ifnet *, struct mbuf *,
96 struct sockaddr *, struct route *);
97 static void lagg_port_ifdetach(void *arg __unused, struct ifnet *);
98 static int lagg_port_checkstacking(struct lagg_softc *);
99 static void lagg_port2req(struct lagg_port *, struct lagg_reqport *);
100 static void lagg_init(void *);
101 static void lagg_stop(struct lagg_softc *);
102 static int lagg_ioctl(struct ifnet *, u_long, caddr_t);
103 static int lagg_ether_setmulti(struct lagg_softc *);
104 static int lagg_ether_cmdmulti(struct lagg_port *, int);
105 static int lagg_setflag(struct lagg_port *, int, int,
106 int (*func)(struct ifnet *, int));
107 static int lagg_setflags(struct lagg_port *, int status);
108 static void lagg_start(struct ifnet *);
109 static int lagg_media_change(struct ifnet *);
110 static void lagg_media_status(struct ifnet *, struct ifmediareq *);
111 static struct lagg_port *lagg_link_active(struct lagg_softc *,
112 struct lagg_port *);
113 static const void *lagg_gethdr(struct mbuf *, u_int, u_int, void *);
114
115 IFC_SIMPLE_DECLARE(lagg, 0);
116
117 /* Simple round robin */
118 static int lagg_rr_attach(struct lagg_softc *);
119 static int lagg_rr_detach(struct lagg_softc *);
120 static int lagg_rr_start(struct lagg_softc *, struct mbuf *);
121 static struct mbuf *lagg_rr_input(struct lagg_softc *, struct lagg_port *,
122 struct mbuf *);
123
124 /* Active failover */
125 static int lagg_fail_attach(struct lagg_softc *);
126 static int lagg_fail_detach(struct lagg_softc *);
127 static int lagg_fail_start(struct lagg_softc *, struct mbuf *);
128 static struct mbuf *lagg_fail_input(struct lagg_softc *, struct lagg_port *,
129 struct mbuf *);
130
131 /* Loadbalancing */
132 static int lagg_lb_attach(struct lagg_softc *);
133 static int lagg_lb_detach(struct lagg_softc *);
134 static int lagg_lb_port_create(struct lagg_port *);
135 static void lagg_lb_port_destroy(struct lagg_port *);
136 static int lagg_lb_start(struct lagg_softc *, struct mbuf *);
137 static struct mbuf *lagg_lb_input(struct lagg_softc *, struct lagg_port *,
138 struct mbuf *);
139 static int lagg_lb_porttable(struct lagg_softc *, struct lagg_port *);
140
141 /* 802.3ad LACP */
142 static int lagg_lacp_attach(struct lagg_softc *);
143 static int lagg_lacp_detach(struct lagg_softc *);
144 static int lagg_lacp_start(struct lagg_softc *, struct mbuf *);
145 static struct mbuf *lagg_lacp_input(struct lagg_softc *, struct lagg_port *,
146 struct mbuf *);
147 static void lagg_lacp_lladdr(struct lagg_softc *);
148
149 /* lagg protocol table */
150 static const struct {
151 int ti_proto;
152 int (*ti_attach)(struct lagg_softc *);
153 } lagg_protos[] = {
154 { LAGG_PROTO_ROUNDROBIN, lagg_rr_attach },
155 { LAGG_PROTO_FAILOVER, lagg_fail_attach },
156 { LAGG_PROTO_LOADBALANCE, lagg_lb_attach },
157 { LAGG_PROTO_ETHERCHANNEL, lagg_lb_attach },
158 { LAGG_PROTO_LACP, lagg_lacp_attach },
159 { LAGG_PROTO_NONE, NULL }
160 };
161
162 static int
163 lagg_modevent(module_t mod, int type, void *data)
164 {
165
166 switch (type) {
167 case MOD_LOAD:
168 mtx_init(&lagg_list_mtx, "if_lagg list", NULL, MTX_DEF);
169 SLIST_INIT(&lagg_list);
170 if_clone_attach(&lagg_cloner);
171 lagg_input_p = lagg_input;
172 lagg_linkstate_p = lagg_port_state;
173 lagg_detach_cookie = EVENTHANDLER_REGISTER(
174 ifnet_departure_event, lagg_port_ifdetach, NULL,
175 EVENTHANDLER_PRI_ANY);
176 break;
177 case MOD_UNLOAD:
178 EVENTHANDLER_DEREGISTER(ifnet_departure_event,
179 lagg_detach_cookie);
180 if_clone_detach(&lagg_cloner);
181 lagg_input_p = NULL;
182 lagg_linkstate_p = NULL;
183 mtx_destroy(&lagg_list_mtx);
184 break;
185 default:
186 return (EOPNOTSUPP);
187 }
188 return (0);
189 }
190
191 static moduledata_t lagg_mod = {
192 "if_lagg",
193 lagg_modevent,
194 0
195 };
196
197 DECLARE_MODULE(if_lagg, lagg_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
198
199 static int
200 lagg_clone_create(struct if_clone *ifc, int unit, caddr_t params)
201 {
202 struct lagg_softc *sc;
203 struct ifnet *ifp;
204 int i, error = 0;
205 static const u_char eaddr[6]; /* 00:00:00:00:00:00 */
206
207 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
208 ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
209 if (ifp == NULL) {
210 free(sc, M_DEVBUF);
211 return (ENOSPC);
212 }
213
214 sc->sc_proto = LAGG_PROTO_NONE;
215 for (i = 0; lagg_protos[i].ti_proto != LAGG_PROTO_NONE; i++) {
216 if (lagg_protos[i].ti_proto == LAGG_PROTO_DEFAULT) {
217 sc->sc_proto = lagg_protos[i].ti_proto;
218 if ((error = lagg_protos[i].ti_attach(sc)) != 0) {
219 if_free_type(ifp, IFT_ETHER);
220 free(sc, M_DEVBUF);
221 return (error);
222 }
223 break;
224 }
225 }
226 LAGG_LOCK_INIT(sc);
227 SLIST_INIT(&sc->sc_ports);
228 TASK_INIT(&sc->sc_lladdr_task, 0, lagg_port_setlladdr, sc);
229
230 /* Initialise pseudo media types */
231 ifmedia_init(&sc->sc_media, 0, lagg_media_change,
232 lagg_media_status);
233 ifmedia_add(&sc->sc_media, IFM_ETHER | IFM_AUTO, 0, NULL);
234 ifmedia_set(&sc->sc_media, IFM_ETHER | IFM_AUTO);
235
236 if_initname(ifp, ifc->ifc_name, unit);
237 ifp->if_type = IFT_ETHER;
238 ifp->if_softc = sc;
239 ifp->if_start = lagg_start;
240 ifp->if_init = lagg_init;
241 ifp->if_ioctl = lagg_ioctl;
242 ifp->if_flags = IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST;
243
244 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
245 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
246 IFQ_SET_READY(&ifp->if_snd);
247
248 /*
249 * Attach as an ordinary ethernet device, childs will be attached
250 * as special device IFT_IEEE8023ADLAG.
251 */
252 ether_ifattach(ifp, eaddr);
253
254 /* Insert into the global list of laggs */
255 mtx_lock(&lagg_list_mtx);
256 SLIST_INSERT_HEAD(&lagg_list, sc, sc_entries);
257 mtx_unlock(&lagg_list_mtx);
258
259 return (0);
260 }
261
262 static void
263 lagg_clone_destroy(struct ifnet *ifp)
264 {
265 struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
266 struct lagg_port *lp;
267
268 LAGG_WLOCK(sc);
269
270 lagg_stop(sc);
271 ifp->if_flags &= ~IFF_UP;
272
273 /* Shutdown and remove lagg ports */
274 while ((lp = SLIST_FIRST(&sc->sc_ports)) != NULL)
275 lagg_port_destroy(lp, 1);
276 /* Unhook the aggregation protocol */
277 (*sc->sc_detach)(sc);
278
279 LAGG_WUNLOCK(sc);
280
281 ifmedia_removeall(&sc->sc_media);
282 ether_ifdetach(ifp);
283 if_free_type(ifp, IFT_ETHER);
284
285 mtx_lock(&lagg_list_mtx);
286 SLIST_REMOVE(&lagg_list, sc, lagg_softc, sc_entries);
287 mtx_unlock(&lagg_list_mtx);
288
289 taskqueue_drain(taskqueue_swi, &sc->sc_lladdr_task);
290 LAGG_LOCK_DESTROY(sc);
291 free(sc, M_DEVBUF);
292 }
293
294 static void
295 lagg_lladdr(struct lagg_softc *sc, uint8_t *lladdr)
296 {
297 struct ifnet *ifp = sc->sc_ifp;
298
299 if (memcmp(lladdr, IF_LLADDR(ifp), ETHER_ADDR_LEN) == 0)
300 return;
301
302 bcopy(lladdr, IF_LLADDR(ifp), ETHER_ADDR_LEN);
303 /* Let the protocol know the MAC has changed */
304 if (sc->sc_lladdr != NULL)
305 (*sc->sc_lladdr)(sc);
306 EVENTHANDLER_INVOKE(iflladdr_event, ifp);
307 }
308
309 static void
310 lagg_capabilities(struct lagg_softc *sc)
311 {
312 struct lagg_port *lp;
313 int cap = ~0, ena = ~0;
314 u_long hwa = ~0UL;
315
316 LAGG_WLOCK_ASSERT(sc);
317
318 /* Get capabilities from the lagg ports */
319 SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
320 cap &= lp->lp_ifp->if_capabilities;
321 ena &= lp->lp_ifp->if_capenable;
322 hwa &= lp->lp_ifp->if_hwassist;
323 }
324 cap = (cap == ~0 ? 0 : cap);
325 ena = (ena == ~0 ? 0 : ena);
326 hwa = (hwa == ~0 ? 0 : hwa);
327
328 if (sc->sc_ifp->if_capabilities != cap ||
329 sc->sc_ifp->if_capenable != ena ||
330 sc->sc_ifp->if_hwassist != hwa) {
331 sc->sc_ifp->if_capabilities = cap;
332 sc->sc_ifp->if_capenable = ena;
333 sc->sc_ifp->if_hwassist = hwa;
334 getmicrotime(&sc->sc_ifp->if_lastchange);
335
336 if (sc->sc_ifflags & IFF_DEBUG)
337 if_printf(sc->sc_ifp,
338 "capabilities 0x%08x enabled 0x%08x\n", cap, ena);
339 }
340 }
341
342 static void
343 lagg_port_lladdr(struct lagg_port *lp, uint8_t *lladdr)
344 {
345 struct lagg_softc *sc = lp->lp_softc;
346 struct ifnet *ifp = lp->lp_ifp;
347 struct lagg_llq *llq;
348 int pending = 0;
349
350 LAGG_WLOCK_ASSERT(sc);
351
352 if (lp->lp_detaching ||
353 memcmp(lladdr, IF_LLADDR(ifp), ETHER_ADDR_LEN) == 0)
354 return;
355
356 /* Check to make sure its not already queued to be changed */
357 SLIST_FOREACH(llq, &sc->sc_llq_head, llq_entries) {
358 if (llq->llq_ifp == ifp) {
359 pending = 1;
360 break;
361 }
362 }
363
364 if (!pending) {
365 llq = malloc(sizeof(struct lagg_llq), M_DEVBUF, M_NOWAIT);
366 if (llq == NULL) /* XXX what to do */
367 return;
368 }
369
370 /* Update the lladdr even if pending, it may have changed */
371 llq->llq_ifp = ifp;
372 bcopy(lladdr, llq->llq_lladdr, ETHER_ADDR_LEN);
373
374 if (!pending)
375 SLIST_INSERT_HEAD(&sc->sc_llq_head, llq, llq_entries);
376
377 taskqueue_enqueue(taskqueue_swi, &sc->sc_lladdr_task);
378 }
379
380 /*
381 * Set the interface MAC address from a taskqueue to avoid a LOR.
382 */
383 static void
384 lagg_port_setlladdr(void *arg, int pending)
385 {
386 struct lagg_softc *sc = (struct lagg_softc *)arg;
387 struct lagg_llq *llq, *head;
388 struct ifnet *ifp;
389 int error;
390
391 /* Grab a local reference of the queue and remove it from the softc */
392 LAGG_WLOCK(sc);
393 head = SLIST_FIRST(&sc->sc_llq_head);
394 SLIST_FIRST(&sc->sc_llq_head) = NULL;
395 LAGG_WUNLOCK(sc);
396
397 /*
398 * Traverse the queue and set the lladdr on each ifp. It is safe to do
399 * unlocked as we have the only reference to it.
400 */
401 for (llq = head; llq != NULL; llq = head) {
402 ifp = llq->llq_ifp;
403
404 /* Set the link layer address */
405 error = if_setlladdr(ifp, llq->llq_lladdr, ETHER_ADDR_LEN);
406 if (error)
407 printf("%s: setlladdr failed on %s\n", __func__,
408 ifp->if_xname);
409
410 head = SLIST_NEXT(llq, llq_entries);
411 free(llq, M_DEVBUF);
412 }
413 }
414
415 static int
416 lagg_port_create(struct lagg_softc *sc, struct ifnet *ifp)
417 {
418 struct lagg_softc *sc_ptr;
419 struct lagg_port *lp;
420 int error = 0;
421
422 LAGG_WLOCK_ASSERT(sc);
423
424 /* Limit the maximal number of lagg ports */
425 if (sc->sc_count >= LAGG_MAX_PORTS)
426 return (ENOSPC);
427
428 /* Check if port has already been associated to a lagg */
429 if (ifp->if_lagg != NULL)
430 return (EBUSY);
431
432 /* XXX Disallow non-ethernet interfaces (this should be any of 802) */
433 if (ifp->if_type != IFT_ETHER)
434 return (EPROTONOSUPPORT);
435
436 /* Allow the first Ethernet member to define the MTU */
437 if (SLIST_EMPTY(&sc->sc_ports))
438 sc->sc_ifp->if_mtu = ifp->if_mtu;
439 else if (sc->sc_ifp->if_mtu != ifp->if_mtu) {
440 if_printf(sc->sc_ifp, "invalid MTU for %s\n",
441 ifp->if_xname);
442 return (EINVAL);
443 }
444
445 if ((lp = malloc(sizeof(struct lagg_port),
446 M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL)
447 return (ENOMEM);
448
449 /* Check if port is a stacked lagg */
450 mtx_lock(&lagg_list_mtx);
451 SLIST_FOREACH(sc_ptr, &lagg_list, sc_entries) {
452 if (ifp == sc_ptr->sc_ifp) {
453 mtx_unlock(&lagg_list_mtx);
454 free(lp, M_DEVBUF);
455 return (EINVAL);
456 /* XXX disable stacking for the moment, its untested
457 lp->lp_flags |= LAGG_PORT_STACK;
458 if (lagg_port_checkstacking(sc_ptr) >=
459 LAGG_MAX_STACKING) {
460 mtx_unlock(&lagg_list_mtx);
461 free(lp, M_DEVBUF);
462 return (E2BIG);
463 }
464 */
465 }
466 }
467 mtx_unlock(&lagg_list_mtx);
468
469 /* Change the interface type */
470 lp->lp_iftype = ifp->if_type;
471 ifp->if_type = IFT_IEEE8023ADLAG;
472 ifp->if_lagg = lp;
473 lp->lp_ioctl = ifp->if_ioctl;
474 ifp->if_ioctl = lagg_port_ioctl;
475 lp->lp_output = ifp->if_output;
476 ifp->if_output = lagg_port_output;
477
478 lp->lp_ifp = ifp;
479 lp->lp_softc = sc;
480
481 /* Save port link layer address */
482 bcopy(IF_LLADDR(ifp), lp->lp_lladdr, ETHER_ADDR_LEN);
483
484 if (SLIST_EMPTY(&sc->sc_ports)) {
485 sc->sc_primary = lp;
486 lagg_lladdr(sc, IF_LLADDR(ifp));
487 } else {
488 /* Update link layer address for this port */
489 lagg_port_lladdr(lp, IF_LLADDR(sc->sc_ifp));
490 }
491
492 /* Insert into the list of ports */
493 SLIST_INSERT_HEAD(&sc->sc_ports, lp, lp_entries);
494 sc->sc_count++;
495
496 /* Update lagg capabilities */
497 lagg_capabilities(sc);
498 lagg_linkstate(sc);
499
500 /* Add multicast addresses and interface flags to this port */
501 lagg_ether_cmdmulti(lp, 1);
502 lagg_setflags(lp, 1);
503
504 if (sc->sc_port_create != NULL)
505 error = (*sc->sc_port_create)(lp);
506 if (error) {
507 /* remove the port again, without calling sc_port_destroy */
508 lagg_port_destroy(lp, 0);
509 return (error);
510 }
511
512 return (error);
513 }
514
515 static int
516 lagg_port_checkstacking(struct lagg_softc *sc)
517 {
518 struct lagg_softc *sc_ptr;
519 struct lagg_port *lp;
520 int m = 0;
521
522 LAGG_WLOCK_ASSERT(sc);
523
524 SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
525 if (lp->lp_flags & LAGG_PORT_STACK) {
526 sc_ptr = (struct lagg_softc *)lp->lp_ifp->if_softc;
527 m = MAX(m, lagg_port_checkstacking(sc_ptr));
528 }
529 }
530
531 return (m + 1);
532 }
533
534 static int
535 lagg_port_destroy(struct lagg_port *lp, int runpd)
536 {
537 struct lagg_softc *sc = lp->lp_softc;
538 struct lagg_port *lp_ptr;
539 struct lagg_llq *llq;
540 struct ifnet *ifp = lp->lp_ifp;
541
542 LAGG_WLOCK_ASSERT(sc);
543
544 if (runpd && sc->sc_port_destroy != NULL)
545 (*sc->sc_port_destroy)(lp);
546
547 /*
548 * Remove multicast addresses and interface flags from this port and
549 * reset the MAC address, skip if the interface is being detached.
550 */
551 if (!lp->lp_detaching) {
552 lagg_ether_cmdmulti(lp, 0);
553 lagg_setflags(lp, 0);
554 lagg_port_lladdr(lp, lp->lp_lladdr);
555 }
556
557 /* Restore interface */
558 ifp->if_type = lp->lp_iftype;
559 ifp->if_ioctl = lp->lp_ioctl;
560 ifp->if_output = lp->lp_output;
561 ifp->if_lagg = NULL;
562
563 /* Finally, remove the port from the lagg */
564 SLIST_REMOVE(&sc->sc_ports, lp, lagg_port, lp_entries);
565 sc->sc_count--;
566
567 /* Update the primary interface */
568 if (lp == sc->sc_primary) {
569 uint8_t lladdr[ETHER_ADDR_LEN];
570
571 if ((lp_ptr = SLIST_FIRST(&sc->sc_ports)) == NULL) {
572 bzero(&lladdr, ETHER_ADDR_LEN);
573 } else {
574 bcopy(lp_ptr->lp_lladdr,
575 lladdr, ETHER_ADDR_LEN);
576 }
577 lagg_lladdr(sc, lladdr);
578 sc->sc_primary = lp_ptr;
579
580 /* Update link layer address for each port */
581 SLIST_FOREACH(lp_ptr, &sc->sc_ports, lp_entries)
582 lagg_port_lladdr(lp_ptr, lladdr);
583 }
584
585 /* Remove any pending lladdr changes from the queue */
586 if (lp->lp_detaching) {
587 SLIST_FOREACH(llq, &sc->sc_llq_head, llq_entries) {
588 if (llq->llq_ifp == ifp) {
589 SLIST_REMOVE(&sc->sc_llq_head, llq, lagg_llq,
590 llq_entries);
591 free(llq, M_DEVBUF);
592 break; /* Only appears once */
593 }
594 }
595 }
596
597 if (lp->lp_ifflags)
598 if_printf(ifp, "%s: lp_ifflags unclean\n", __func__);
599
600 free(lp, M_DEVBUF);
601
602 /* Update lagg capabilities */
603 lagg_capabilities(sc);
604 lagg_linkstate(sc);
605
606 return (0);
607 }
608
609 static int
610 lagg_port_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
611 {
612 struct lagg_reqport *rp = (struct lagg_reqport *)data;
613 struct lagg_softc *sc;
614 struct lagg_port *lp = NULL;
615 int error = 0;
616
617 /* Should be checked by the caller */
618 if (ifp->if_type != IFT_IEEE8023ADLAG ||
619 (lp = ifp->if_lagg) == NULL || (sc = lp->lp_softc) == NULL)
620 goto fallback;
621
622 switch (cmd) {
623 case SIOCGLAGGPORT:
624 if (rp->rp_portname[0] == '\0' ||
625 ifunit(rp->rp_portname) != ifp) {
626 error = EINVAL;
627 break;
628 }
629
630 LAGG_RLOCK(sc);
631 if ((lp = ifp->if_lagg) == NULL || lp->lp_softc != sc) {
632 error = ENOENT;
633 LAGG_RUNLOCK(sc);
634 break;
635 }
636
637 lagg_port2req(lp, rp);
638 LAGG_RUNLOCK(sc);
639 break;
640
641 case SIOCSIFCAP:
642 if (lp->lp_ioctl == NULL) {
643 error = EINVAL;
644 break;
645 }
646 error = (*lp->lp_ioctl)(ifp, cmd, data);
647 if (error)
648 break;
649
650 /* Update lagg interface capabilities */
651 LAGG_WLOCK(sc);
652 lagg_capabilities(sc);
653 LAGG_WUNLOCK(sc);
654 break;
655
656 case SIOCSIFMTU:
657 /* Do not allow the MTU to be changed once joined */
658 error = EINVAL;
659 break;
660
661 default:
662 goto fallback;
663 }
664
665 return (error);
666
667 fallback:
668 if (lp->lp_ioctl != NULL)
669 return ((*lp->lp_ioctl)(ifp, cmd, data));
670
671 return (EINVAL);
672 }
673
674 static int
675 lagg_port_output(struct ifnet *ifp, struct mbuf *m,
676 struct sockaddr *dst, struct route *ro)
677 {
678 struct lagg_port *lp = ifp->if_lagg;
679 struct ether_header *eh;
680 short type = 0;
681
682 switch (dst->sa_family) {
683 case pseudo_AF_HDRCMPLT:
684 case AF_UNSPEC:
685 eh = (struct ether_header *)dst->sa_data;
686 type = eh->ether_type;
687 break;
688 }
689
690 /*
691 * Only allow ethernet types required to initiate or maintain the link,
692 * aggregated frames take a different path.
693 */
694 switch (ntohs(type)) {
695 case ETHERTYPE_PAE: /* EAPOL PAE/802.1x */
696 return ((*lp->lp_output)(ifp, m, dst, ro));
697 }
698
699 /* drop any other frames */
700 m_freem(m);
701 return (EBUSY);
702 }
703
704 static void
705 lagg_port_ifdetach(void *arg __unused, struct ifnet *ifp)
706 {
707 struct lagg_port *lp;
708 struct lagg_softc *sc;
709
710 if ((lp = ifp->if_lagg) == NULL)
711 return;
712
713 sc = lp->lp_softc;
714
715 LAGG_WLOCK(sc);
716 lp->lp_detaching = 1;
717 lagg_port_destroy(lp, 1);
718 LAGG_WUNLOCK(sc);
719 }
720
721 static void
722 lagg_port2req(struct lagg_port *lp, struct lagg_reqport *rp)
723 {
724 struct lagg_softc *sc = lp->lp_softc;
725
726 strlcpy(rp->rp_ifname, sc->sc_ifname, sizeof(rp->rp_ifname));
727 strlcpy(rp->rp_portname, lp->lp_ifp->if_xname, sizeof(rp->rp_portname));
728 rp->rp_prio = lp->lp_prio;
729 rp->rp_flags = lp->lp_flags;
730 if (sc->sc_portreq != NULL)
731 (*sc->sc_portreq)(lp, (caddr_t)&rp->rp_psc);
732
733 /* Add protocol specific flags */
734 switch (sc->sc_proto) {
735 case LAGG_PROTO_FAILOVER:
736 if (lp == sc->sc_primary)
737 rp->rp_flags |= LAGG_PORT_MASTER;
738 if (lp == lagg_link_active(sc, sc->sc_primary))
739 rp->rp_flags |= LAGG_PORT_ACTIVE;
740 break;
741
742 case LAGG_PROTO_ROUNDROBIN:
743 case LAGG_PROTO_LOADBALANCE:
744 case LAGG_PROTO_ETHERCHANNEL:
745 if (LAGG_PORTACTIVE(lp))
746 rp->rp_flags |= LAGG_PORT_ACTIVE;
747 break;
748
749 case LAGG_PROTO_LACP:
750 /* LACP has a different definition of active */
751 if (lacp_isactive(lp))
752 rp->rp_flags |= LAGG_PORT_ACTIVE;
753 if (lacp_iscollecting(lp))
754 rp->rp_flags |= LAGG_PORT_COLLECTING;
755 if (lacp_isdistributing(lp))
756 rp->rp_flags |= LAGG_PORT_DISTRIBUTING;
757 break;
758 }
759
760 }
761
762 static void
763 lagg_init(void *xsc)
764 {
765 struct lagg_softc *sc = (struct lagg_softc *)xsc;
766 struct lagg_port *lp;
767 struct ifnet *ifp = sc->sc_ifp;
768
769 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
770 return;
771
772 LAGG_WLOCK(sc);
773
774 ifp->if_drv_flags |= IFF_DRV_RUNNING;
775 /* Update the port lladdrs */
776 SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
777 lagg_port_lladdr(lp, IF_LLADDR(ifp));
778
779 if (sc->sc_init != NULL)
780 (*sc->sc_init)(sc);
781
782 LAGG_WUNLOCK(sc);
783 }
784
785 static void
786 lagg_stop(struct lagg_softc *sc)
787 {
788 struct ifnet *ifp = sc->sc_ifp;
789
790 LAGG_WLOCK_ASSERT(sc);
791
792 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
793 return;
794
795 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
796
797 if (sc->sc_stop != NULL)
798 (*sc->sc_stop)(sc);
799 }
800
801 static int
802 lagg_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
803 {
804 struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
805 struct lagg_reqall *ra = (struct lagg_reqall *)data;
806 struct lagg_reqport *rp = (struct lagg_reqport *)data, rpbuf;
807 struct ifreq *ifr = (struct ifreq *)data;
808 struct lagg_port *lp;
809 struct ifnet *tpif;
810 struct thread *td = curthread;
811 char *buf, *outbuf;
812 int count, buflen, len, error = 0;
813
814 bzero(&rpbuf, sizeof(rpbuf));
815
816 switch (cmd) {
817 case SIOCGLAGG:
818 LAGG_RLOCK(sc);
819 count = 0;
820 SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
821 count++;
822 buflen = count * sizeof(struct lagg_reqport);
823 LAGG_RUNLOCK(sc);
824
825 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
826
827 LAGG_RLOCK(sc);
828 ra->ra_proto = sc->sc_proto;
829 if (sc->sc_req != NULL)
830 (*sc->sc_req)(sc, (caddr_t)&ra->ra_psc);
831
832 count = 0;
833 buf = outbuf;
834 len = min(ra->ra_size, buflen);
835 SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
836 if (len < sizeof(rpbuf))
837 break;
838
839 lagg_port2req(lp, &rpbuf);
840 memcpy(buf, &rpbuf, sizeof(rpbuf));
841 count++;
842 buf += sizeof(rpbuf);
843 len -= sizeof(rpbuf);
844 }
845 LAGG_RUNLOCK(sc);
846 ra->ra_ports = count;
847 ra->ra_size = count * sizeof(rpbuf);
848 error = copyout(outbuf, ra->ra_port, ra->ra_size);
849 free(outbuf, M_TEMP);
850 break;
851 case SIOCSLAGG:
852 error = priv_check(td, PRIV_NET_LAGG);
853 if (error)
854 break;
855 if (ra->ra_proto >= LAGG_PROTO_MAX) {
856 error = EPROTONOSUPPORT;
857 break;
858 }
859 if (sc->sc_proto != LAGG_PROTO_NONE) {
860 LAGG_WLOCK(sc);
861 error = sc->sc_detach(sc);
862 /* Reset protocol and pointers */
863 sc->sc_proto = LAGG_PROTO_NONE;
864 sc->sc_detach = NULL;
865 sc->sc_start = NULL;
866 sc->sc_input = NULL;
867 sc->sc_port_create = NULL;
868 sc->sc_port_destroy = NULL;
869 sc->sc_linkstate = NULL;
870 sc->sc_init = NULL;
871 sc->sc_stop = NULL;
872 sc->sc_lladdr = NULL;
873 sc->sc_req = NULL;
874 sc->sc_portreq = NULL;
875 LAGG_WUNLOCK(sc);
876 }
877 if (error != 0)
878 break;
879 for (int i = 0; i < (sizeof(lagg_protos) /
880 sizeof(lagg_protos[0])); i++) {
881 if (lagg_protos[i].ti_proto == ra->ra_proto) {
882 if (sc->sc_ifflags & IFF_DEBUG)
883 printf("%s: using proto %u\n",
884 sc->sc_ifname,
885 lagg_protos[i].ti_proto);
886 LAGG_WLOCK(sc);
887 sc->sc_proto = lagg_protos[i].ti_proto;
888 if (sc->sc_proto != LAGG_PROTO_NONE)
889 error = lagg_protos[i].ti_attach(sc);
890 LAGG_WUNLOCK(sc);
891 return (error);
892 }
893 }
894 error = EPROTONOSUPPORT;
895 break;
896 case SIOCGLAGGPORT:
897 if (rp->rp_portname[0] == '\0' ||
898 (tpif = ifunit(rp->rp_portname)) == NULL) {
899 error = EINVAL;
900 break;
901 }
902
903 LAGG_RLOCK(sc);
904 if ((lp = (struct lagg_port *)tpif->if_lagg) == NULL ||
905 lp->lp_softc != sc) {
906 error = ENOENT;
907 LAGG_RUNLOCK(sc);
908 break;
909 }
910
911 lagg_port2req(lp, rp);
912 LAGG_RUNLOCK(sc);
913 break;
914 case SIOCSLAGGPORT:
915 error = priv_check(td, PRIV_NET_LAGG);
916 if (error)
917 break;
918 if (rp->rp_portname[0] == '\0' ||
919 (tpif = ifunit(rp->rp_portname)) == NULL) {
920 error = EINVAL;
921 break;
922 }
923 LAGG_WLOCK(sc);
924 error = lagg_port_create(sc, tpif);
925 LAGG_WUNLOCK(sc);
926 break;
927 case SIOCSLAGGDELPORT:
928 error = priv_check(td, PRIV_NET_LAGG);
929 if (error)
930 break;
931 if (rp->rp_portname[0] == '\0' ||
932 (tpif = ifunit(rp->rp_portname)) == NULL) {
933 error = EINVAL;
934 break;
935 }
936
937 LAGG_WLOCK(sc);
938 if ((lp = (struct lagg_port *)tpif->if_lagg) == NULL ||
939 lp->lp_softc != sc) {
940 error = ENOENT;
941 LAGG_WUNLOCK(sc);
942 break;
943 }
944
945 error = lagg_port_destroy(lp, 1);
946 LAGG_WUNLOCK(sc);
947 break;
948 case SIOCSIFFLAGS:
949 /* Set flags on ports too */
950 LAGG_WLOCK(sc);
951 SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
952 lagg_setflags(lp, 1);
953 }
954 LAGG_WUNLOCK(sc);
955
956 if (!(ifp->if_flags & IFF_UP) &&
957 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
958 /*
959 * If interface is marked down and it is running,
960 * then stop and disable it.
961 */
962 LAGG_WLOCK(sc);
963 lagg_stop(sc);
964 LAGG_WUNLOCK(sc);
965 } else if ((ifp->if_flags & IFF_UP) &&
966 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
967 /*
968 * If interface is marked up and it is stopped, then
969 * start it.
970 */
971 (*ifp->if_init)(sc);
972 }
973 break;
974 case SIOCADDMULTI:
975 case SIOCDELMULTI:
976 LAGG_WLOCK(sc);
977 error = lagg_ether_setmulti(sc);
978 LAGG_WUNLOCK(sc);
979 break;
980 case SIOCSIFMEDIA:
981 case SIOCGIFMEDIA:
982 error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd);
983 break;
984
985 case SIOCSIFCAP:
986 case SIOCSIFMTU:
987 /* Do not allow the MTU or caps to be directly changed */
988 error = EINVAL;
989 break;
990
991 default:
992 error = ether_ioctl(ifp, cmd, data);
993 break;
994 }
995 return (error);
996 }
997
998 static int
999 lagg_ether_setmulti(struct lagg_softc *sc)
1000 {
1001 struct lagg_port *lp;
1002
1003 LAGG_WLOCK_ASSERT(sc);
1004
1005 SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
1006 /* First, remove any existing filter entries. */
1007 lagg_ether_cmdmulti(lp, 0);
1008 /* copy all addresses from the lagg interface to the port */
1009 lagg_ether_cmdmulti(lp, 1);
1010 }
1011 return (0);
1012 }
1013
1014 static int
1015 lagg_ether_cmdmulti(struct lagg_port *lp, int set)
1016 {
1017 struct lagg_softc *sc = lp->lp_softc;
1018 struct ifnet *ifp = lp->lp_ifp;
1019 struct ifnet *scifp = sc->sc_ifp;
1020 struct lagg_mc *mc;
1021 struct ifmultiaddr *ifma, *rifma = NULL;
1022 struct sockaddr_dl sdl;
1023 int error;
1024
1025 LAGG_WLOCK_ASSERT(sc);
1026
1027 bzero((char *)&sdl, sizeof(sdl));
1028 sdl.sdl_len = sizeof(sdl);
1029 sdl.sdl_family = AF_LINK;
1030 sdl.sdl_type = IFT_ETHER;
1031 sdl.sdl_alen = ETHER_ADDR_LEN;
1032 sdl.sdl_index = ifp->if_index;
1033
1034 if (set) {
1035 TAILQ_FOREACH(ifma, &scifp->if_multiaddrs, ifma_link) {
1036 if (ifma->ifma_addr->sa_family != AF_LINK)
1037 continue;
1038 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
1039 LLADDR(&sdl), ETHER_ADDR_LEN);
1040
1041 error = if_addmulti(ifp, (struct sockaddr *)&sdl, &rifma);
1042 if (error)
1043 return (error);
1044 mc = malloc(sizeof(struct lagg_mc), M_DEVBUF, M_NOWAIT);
1045 if (mc == NULL)
1046 return (ENOMEM);
1047 mc->mc_ifma = rifma;
1048 SLIST_INSERT_HEAD(&lp->lp_mc_head, mc, mc_entries);
1049 }
1050 } else {
1051 while ((mc = SLIST_FIRST(&lp->lp_mc_head)) != NULL) {
1052 SLIST_REMOVE(&lp->lp_mc_head, mc, lagg_mc, mc_entries);
1053 if_delmulti_ifma(mc->mc_ifma);
1054 free(mc, M_DEVBUF);
1055 }
1056 }
1057 return (0);
1058 }
1059
1060 /* Handle a ref counted flag that should be set on the lagg port as well */
1061 static int
1062 lagg_setflag(struct lagg_port *lp, int flag, int status,
1063 int (*func)(struct ifnet *, int))
1064 {
1065 struct lagg_softc *sc = lp->lp_softc;
1066 struct ifnet *scifp = sc->sc_ifp;
1067 struct ifnet *ifp = lp->lp_ifp;
1068 int error;
1069
1070 LAGG_WLOCK_ASSERT(sc);
1071
1072 status = status ? (scifp->if_flags & flag) : 0;
1073 /* Now "status" contains the flag value or 0 */
1074
1075 /*
1076 * See if recorded ports status is different from what
1077 * we want it to be. If it is, flip it. We record ports
1078 * status in lp_ifflags so that we won't clear ports flag
1079 * we haven't set. In fact, we don't clear or set ports
1080 * flags directly, but get or release references to them.
1081 * That's why we can be sure that recorded flags still are
1082 * in accord with actual ports flags.
1083 */
1084 if (status != (lp->lp_ifflags & flag)) {
1085 error = (*func)(ifp, status);
1086 if (error)
1087 return (error);
1088 lp->lp_ifflags &= ~flag;
1089 lp->lp_ifflags |= status;
1090 }
1091 return (0);
1092 }
1093
1094 /*
1095 * Handle IFF_* flags that require certain changes on the lagg port
1096 * if "status" is true, update ports flags respective to the lagg
1097 * if "status" is false, forcedly clear the flags set on port.
1098 */
1099 static int
1100 lagg_setflags(struct lagg_port *lp, int status)
1101 {
1102 int error, i;
1103
1104 for (i = 0; lagg_pflags[i].flag; i++) {
1105 error = lagg_setflag(lp, lagg_pflags[i].flag,
1106 status, lagg_pflags[i].func);
1107 if (error)
1108 return (error);
1109 }
1110 return (0);
1111 }
1112
1113 static void
1114 lagg_start(struct ifnet *ifp)
1115 {
1116 struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
1117 struct mbuf *m;
1118 int error = 0;
1119
1120 LAGG_RLOCK(sc);
1121 /* We need a Tx algorithm and at least one port */
1122 if (sc->sc_proto == LAGG_PROTO_NONE || sc->sc_count == 0) {
1123 IF_DRAIN(&ifp->if_snd);
1124 LAGG_RUNLOCK(sc);
1125 return;
1126 }
1127
1128 for (;; error = 0) {
1129 IFQ_DEQUEUE(&ifp->if_snd, m);
1130 if (m == NULL)
1131 break;
1132
1133 ETHER_BPF_MTAP(ifp, m);
1134
1135 error = (*sc->sc_start)(sc, m);
1136 if (error == 0)
1137 ifp->if_opackets++;
1138 else
1139 ifp->if_oerrors++;
1140 }
1141 LAGG_RUNLOCK(sc);
1142 }
1143
1144 static struct mbuf *
1145 lagg_input(struct ifnet *ifp, struct mbuf *m)
1146 {
1147 struct lagg_port *lp = ifp->if_lagg;
1148 struct lagg_softc *sc = lp->lp_softc;
1149 struct ifnet *scifp = sc->sc_ifp;
1150
1151 if ((scifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
1152 (lp->lp_flags & LAGG_PORT_DISABLED) ||
1153 sc->sc_proto == LAGG_PROTO_NONE) {
1154 m_freem(m);
1155 return (NULL);
1156 }
1157
1158 LAGG_RLOCK(sc);
1159 ETHER_BPF_MTAP(scifp, m);
1160
1161 m = (*sc->sc_input)(sc, lp, m);
1162
1163 if (m != NULL) {
1164 scifp->if_ipackets++;
1165 scifp->if_ibytes += m->m_pkthdr.len;
1166
1167 if (scifp->if_flags & IFF_MONITOR) {
1168 m_freem(m);
1169 m = NULL;
1170 }
1171 }
1172
1173 LAGG_RUNLOCK(sc);
1174 return (m);
1175 }
1176
1177 static int
1178 lagg_media_change(struct ifnet *ifp)
1179 {
1180 struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
1181
1182 if (sc->sc_ifflags & IFF_DEBUG)
1183 printf("%s\n", __func__);
1184
1185 /* Ignore */
1186 return (0);
1187 }
1188
1189 static void
1190 lagg_media_status(struct ifnet *ifp, struct ifmediareq *imr)
1191 {
1192 struct lagg_softc *sc = (struct lagg_softc *)ifp->if_softc;
1193 struct lagg_port *lp;
1194
1195 imr->ifm_status = IFM_AVALID;
1196 imr->ifm_active = IFM_ETHER | IFM_AUTO;
1197
1198 LAGG_RLOCK(sc);
1199 SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
1200 if (LAGG_PORTACTIVE(lp))
1201 imr->ifm_status |= IFM_ACTIVE;
1202 }
1203 LAGG_RUNLOCK(sc);
1204 }
1205
1206 static void
1207 lagg_linkstate(struct lagg_softc *sc)
1208 {
1209 struct lagg_port *lp;
1210 int new_link = LINK_STATE_DOWN;
1211 uint64_t speed;
1212
1213 /* Our link is considered up if at least one of our ports is active */
1214 SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
1215 if (lp->lp_link_state == LINK_STATE_UP) {
1216 new_link = LINK_STATE_UP;
1217 break;
1218 }
1219 }
1220 if_link_state_change(sc->sc_ifp, new_link);
1221
1222 /* Update if_baudrate to reflect the max possible speed */
1223 switch (sc->sc_proto) {
1224 case LAGG_PROTO_FAILOVER:
1225 sc->sc_ifp->if_baudrate = sc->sc_primary != NULL ?
1226 sc->sc_primary->lp_ifp->if_baudrate : 0;
1227 break;
1228 case LAGG_PROTO_ROUNDROBIN:
1229 case LAGG_PROTO_LOADBALANCE:
1230 case LAGG_PROTO_ETHERCHANNEL:
1231 speed = 0;
1232 SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
1233 speed += lp->lp_ifp->if_baudrate;
1234 sc->sc_ifp->if_baudrate = speed;
1235 break;
1236 case LAGG_PROTO_LACP:
1237 /* LACP updates if_baudrate itself */
1238 break;
1239 }
1240 }
1241
1242 static void
1243 lagg_port_state(struct ifnet *ifp, int state)
1244 {
1245 struct lagg_port *lp = (struct lagg_port *)ifp->if_lagg;
1246 struct lagg_softc *sc = NULL;
1247
1248 if (lp != NULL)
1249 sc = lp->lp_softc;
1250 if (sc == NULL)
1251 return;
1252
1253 LAGG_WLOCK(sc);
1254 lagg_linkstate(sc);
1255 if (sc->sc_linkstate != NULL)
1256 (*sc->sc_linkstate)(lp);
1257 LAGG_WUNLOCK(sc);
1258 }
1259
1260 struct lagg_port *
1261 lagg_link_active(struct lagg_softc *sc, struct lagg_port *lp)
1262 {
1263 struct lagg_port *lp_next, *rval = NULL;
1264 // int new_link = LINK_STATE_DOWN;
1265
1266 LAGG_RLOCK_ASSERT(sc);
1267 /*
1268 * Search a port which reports an active link state.
1269 */
1270
1271 if (lp == NULL)
1272 goto search;
1273 if (LAGG_PORTACTIVE(lp)) {
1274 rval = lp;
1275 goto found;
1276 }
1277 if ((lp_next = SLIST_NEXT(lp, lp_entries)) != NULL &&
1278 LAGG_PORTACTIVE(lp_next)) {
1279 rval = lp_next;
1280 goto found;
1281 }
1282
1283 search:
1284 SLIST_FOREACH(lp_next, &sc->sc_ports, lp_entries) {
1285 if (LAGG_PORTACTIVE(lp_next)) {
1286 rval = lp_next;
1287 goto found;
1288 }
1289 }
1290
1291 found:
1292 if (rval != NULL) {
1293 /*
1294 * The IEEE 802.1D standard assumes that a lagg with
1295 * multiple ports is always full duplex. This is valid
1296 * for load sharing laggs and if at least two links
1297 * are active. Unfortunately, checking the latter would
1298 * be too expensive at this point.
1299 XXX
1300 if ((sc->sc_capabilities & IFCAP_LAGG_FULLDUPLEX) &&
1301 (sc->sc_count > 1))
1302 new_link = LINK_STATE_FULL_DUPLEX;
1303 else
1304 new_link = rval->lp_link_state;
1305 */
1306 }
1307
1308 return (rval);
1309 }
1310
1311 static const void *
1312 lagg_gethdr(struct mbuf *m, u_int off, u_int len, void *buf)
1313 {
1314 if (m->m_pkthdr.len < (off + len)) {
1315 return (NULL);
1316 } else if (m->m_len < (off + len)) {
1317 m_copydata(m, off, len, buf);
1318 return (buf);
1319 }
1320 return (mtod(m, char *) + off);
1321 }
1322
1323 uint32_t
1324 lagg_hashmbuf(struct mbuf *m, uint32_t key)
1325 {
1326 uint16_t etype;
1327 uint32_t p = 0;
1328 int off;
1329 struct ether_header *eh;
1330 struct ether_vlan_header vlanbuf;
1331 const struct ether_vlan_header *vlan;
1332 #ifdef INET
1333 const struct ip *ip;
1334 struct ip ipbuf;
1335 #endif
1336 #ifdef INET6
1337 const struct ip6_hdr *ip6;
1338 struct ip6_hdr ip6buf;
1339 uint32_t flow;
1340 #endif
1341
1342 off = sizeof(*eh);
1343 if (m->m_len < off)
1344 goto out;
1345 eh = mtod(m, struct ether_header *);
1346 etype = ntohs(eh->ether_type);
1347 p = hash32_buf(&eh->ether_shost, ETHER_ADDR_LEN, key);
1348 p = hash32_buf(&eh->ether_dhost, ETHER_ADDR_LEN, p);
1349
1350 /* Special handling for encapsulating VLAN frames */
1351 if (m->m_flags & M_VLANTAG) {
1352 p = hash32_buf(&m->m_pkthdr.ether_vtag,
1353 sizeof(m->m_pkthdr.ether_vtag), p);
1354 } else if (etype == ETHERTYPE_VLAN) {
1355 vlan = lagg_gethdr(m, off, sizeof(*vlan), &vlanbuf);
1356 if (vlan == NULL)
1357 goto out;
1358
1359 p = hash32_buf(&vlan->evl_tag, sizeof(vlan->evl_tag), p);
1360 etype = ntohs(vlan->evl_proto);
1361 off += sizeof(*vlan) - sizeof(*eh);
1362 }
1363
1364 switch (etype) {
1365 #ifdef INET
1366 case ETHERTYPE_IP:
1367 ip = lagg_gethdr(m, off, sizeof(*ip), &ipbuf);
1368 if (ip == NULL)
1369 goto out;
1370
1371 p = hash32_buf(&ip->ip_src, sizeof(struct in_addr), p);
1372 p = hash32_buf(&ip->ip_dst, sizeof(struct in_addr), p);
1373 break;
1374 #endif
1375 #ifdef INET6
1376 case ETHERTYPE_IPV6:
1377 ip6 = lagg_gethdr(m, off, sizeof(*ip6), &ip6buf);
1378 if (ip6 == NULL)
1379 goto out;
1380
1381 p = hash32_buf(&ip6->ip6_src, sizeof(struct in6_addr), p);
1382 p = hash32_buf(&ip6->ip6_dst, sizeof(struct in6_addr), p);
1383 flow = ip6->ip6_flow & IPV6_FLOWLABEL_MASK;
1384 p = hash32_buf(&flow, sizeof(flow), p); /* IPv6 flow label */
1385 break;
1386 #endif
1387 }
1388 out:
1389 return (p);
1390 }
1391
1392 int
1393 lagg_enqueue(struct ifnet *ifp, struct mbuf *m)
1394 {
1395
1396 return (ifp->if_transmit)(ifp, m);
1397 }
1398
1399 /*
1400 * Simple round robin aggregation
1401 */
1402
1403 static int
1404 lagg_rr_attach(struct lagg_softc *sc)
1405 {
1406 sc->sc_detach = lagg_rr_detach;
1407 sc->sc_start = lagg_rr_start;
1408 sc->sc_input = lagg_rr_input;
1409 sc->sc_port_create = NULL;
1410 sc->sc_capabilities = IFCAP_LAGG_FULLDUPLEX;
1411 sc->sc_seq = 0;
1412
1413 return (0);
1414 }
1415
1416 static int
1417 lagg_rr_detach(struct lagg_softc *sc)
1418 {
1419 return (0);
1420 }
1421
1422 static int
1423 lagg_rr_start(struct lagg_softc *sc, struct mbuf *m)
1424 {
1425 struct lagg_port *lp;
1426 uint32_t p;
1427
1428 p = atomic_fetchadd_32(&sc->sc_seq, 1);
1429 p %= sc->sc_count;
1430 lp = SLIST_FIRST(&sc->sc_ports);
1431 while (p--)
1432 lp = SLIST_NEXT(lp, lp_entries);
1433
1434 /*
1435 * Check the port's link state. This will return the next active
1436 * port if the link is down or the port is NULL.
1437 */
1438 if ((lp = lagg_link_active(sc, lp)) == NULL) {
1439 m_freem(m);
1440 return (ENOENT);
1441 }
1442
1443 /* Send mbuf */
1444 return (lagg_enqueue(lp->lp_ifp, m));
1445 }
1446
1447 static struct mbuf *
1448 lagg_rr_input(struct lagg_softc *sc, struct lagg_port *lp, struct mbuf *m)
1449 {
1450 struct ifnet *ifp = sc->sc_ifp;
1451
1452 /* Just pass in the packet to our lagg device */
1453 m->m_pkthdr.rcvif = ifp;
1454
1455 return (m);
1456 }
1457
1458 /*
1459 * Active failover
1460 */
1461
1462 static int
1463 lagg_fail_attach(struct lagg_softc *sc)
1464 {
1465 sc->sc_detach = lagg_fail_detach;
1466 sc->sc_start = lagg_fail_start;
1467 sc->sc_input = lagg_fail_input;
1468 sc->sc_port_create = NULL;
1469 sc->sc_port_destroy = NULL;
1470
1471 return (0);
1472 }
1473
1474 static int
1475 lagg_fail_detach(struct lagg_softc *sc)
1476 {
1477 return (0);
1478 }
1479
1480 static int
1481 lagg_fail_start(struct lagg_softc *sc, struct mbuf *m)
1482 {
1483 struct lagg_port *lp;
1484
1485 /* Use the master port if active or the next available port */
1486 if ((lp = lagg_link_active(sc, sc->sc_primary)) == NULL) {
1487 m_freem(m);
1488 return (ENOENT);
1489 }
1490
1491 /* Send mbuf */
1492 return (lagg_enqueue(lp->lp_ifp, m));
1493 }
1494
1495 static struct mbuf *
1496 lagg_fail_input(struct lagg_softc *sc, struct lagg_port *lp, struct mbuf *m)
1497 {
1498 struct ifnet *ifp = sc->sc_ifp;
1499 struct lagg_port *tmp_tp;
1500
1501 if (lp == sc->sc_primary) {
1502 m->m_pkthdr.rcvif = ifp;
1503 return (m);
1504 }
1505
1506 if (!LAGG_PORTACTIVE(sc->sc_primary)) {
1507 tmp_tp = lagg_link_active(sc, sc->sc_primary);
1508 /*
1509 * If tmp_tp is null, we've recieved a packet when all
1510 * our links are down. Weird, but process it anyways.
1511 */
1512 if ((tmp_tp == NULL || tmp_tp == lp)) {
1513 m->m_pkthdr.rcvif = ifp;
1514 return (m);
1515 }
1516 }
1517
1518 m_freem(m);
1519 return (NULL);
1520 }
1521
1522 /*
1523 * Loadbalancing
1524 */
1525
1526 static int
1527 lagg_lb_attach(struct lagg_softc *sc)
1528 {
1529 struct lagg_port *lp;
1530 struct lagg_lb *lb;
1531
1532 if ((lb = (struct lagg_lb *)malloc(sizeof(struct lagg_lb),
1533 M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL)
1534 return (ENOMEM);
1535
1536 sc->sc_detach = lagg_lb_detach;
1537 sc->sc_start = lagg_lb_start;
1538 sc->sc_input = lagg_lb_input;
1539 sc->sc_port_create = lagg_lb_port_create;
1540 sc->sc_port_destroy = lagg_lb_port_destroy;
1541 sc->sc_capabilities = IFCAP_LAGG_FULLDUPLEX;
1542
1543 lb->lb_key = arc4random();
1544 sc->sc_psc = (caddr_t)lb;
1545
1546 SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
1547 lagg_lb_port_create(lp);
1548
1549 return (0);
1550 }
1551
1552 static int
1553 lagg_lb_detach(struct lagg_softc *sc)
1554 {
1555 struct lagg_lb *lb = (struct lagg_lb *)sc->sc_psc;
1556 if (lb != NULL)
1557 free(lb, M_DEVBUF);
1558 return (0);
1559 }
1560
1561 static int
1562 lagg_lb_porttable(struct lagg_softc *sc, struct lagg_port *lp)
1563 {
1564 struct lagg_lb *lb = (struct lagg_lb *)sc->sc_psc;
1565 struct lagg_port *lp_next;
1566 int i = 0;
1567
1568 bzero(&lb->lb_ports, sizeof(lb->lb_ports));
1569 SLIST_FOREACH(lp_next, &sc->sc_ports, lp_entries) {
1570 if (lp_next == lp)
1571 continue;
1572 if (i >= LAGG_MAX_PORTS)
1573 return (EINVAL);
1574 if (sc->sc_ifflags & IFF_DEBUG)
1575 printf("%s: port %s at index %d\n",
1576 sc->sc_ifname, lp_next->lp_ifname, i);
1577 lb->lb_ports[i++] = lp_next;
1578 }
1579
1580 return (0);
1581 }
1582
1583 static int
1584 lagg_lb_port_create(struct lagg_port *lp)
1585 {
1586 struct lagg_softc *sc = lp->lp_softc;
1587 return (lagg_lb_porttable(sc, NULL));
1588 }
1589
1590 static void
1591 lagg_lb_port_destroy(struct lagg_port *lp)
1592 {
1593 struct lagg_softc *sc = lp->lp_softc;
1594 lagg_lb_porttable(sc, lp);
1595 }
1596
1597 static int
1598 lagg_lb_start(struct lagg_softc *sc, struct mbuf *m)
1599 {
1600 struct lagg_lb *lb = (struct lagg_lb *)sc->sc_psc;
1601 struct lagg_port *lp = NULL;
1602 uint32_t p = 0;
1603
1604 if (m->m_flags & M_FLOWID)
1605 p = m->m_pkthdr.flowid;
1606 else
1607 p = lagg_hashmbuf(m, lb->lb_key);
1608 p %= sc->sc_count;
1609 lp = lb->lb_ports[p];
1610
1611 /*
1612 * Check the port's link state. This will return the next active
1613 * port if the link is down or the port is NULL.
1614 */
1615 if ((lp = lagg_link_active(sc, lp)) == NULL) {
1616 m_freem(m);
1617 return (ENOENT);
1618 }
1619
1620 /* Send mbuf */
1621 return (lagg_enqueue(lp->lp_ifp, m));
1622 }
1623
1624 static struct mbuf *
1625 lagg_lb_input(struct lagg_softc *sc, struct lagg_port *lp, struct mbuf *m)
1626 {
1627 struct ifnet *ifp = sc->sc_ifp;
1628
1629 /* Just pass in the packet to our lagg device */
1630 m->m_pkthdr.rcvif = ifp;
1631
1632 return (m);
1633 }
1634
1635 /*
1636 * 802.3ad LACP
1637 */
1638
1639 static int
1640 lagg_lacp_attach(struct lagg_softc *sc)
1641 {
1642 struct lagg_port *lp;
1643 int error;
1644
1645 sc->sc_detach = lagg_lacp_detach;
1646 sc->sc_port_create = lacp_port_create;
1647 sc->sc_port_destroy = lacp_port_destroy;
1648 sc->sc_linkstate = lacp_linkstate;
1649 sc->sc_start = lagg_lacp_start;
1650 sc->sc_input = lagg_lacp_input;
1651 sc->sc_init = lacp_init;
1652 sc->sc_stop = lacp_stop;
1653 sc->sc_lladdr = lagg_lacp_lladdr;
1654 sc->sc_req = lacp_req;
1655 sc->sc_portreq = lacp_portreq;
1656
1657 error = lacp_attach(sc);
1658 if (error)
1659 return (error);
1660
1661 SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
1662 lacp_port_create(lp);
1663
1664 return (error);
1665 }
1666
1667 static int
1668 lagg_lacp_detach(struct lagg_softc *sc)
1669 {
1670 struct lagg_port *lp;
1671 int error;
1672
1673 SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
1674 lacp_port_destroy(lp);
1675
1676 /* unlocking is safe here */
1677 LAGG_WUNLOCK(sc);
1678 error = lacp_detach(sc);
1679 LAGG_WLOCK(sc);
1680
1681 return (error);
1682 }
1683
1684 static void
1685 lagg_lacp_lladdr(struct lagg_softc *sc)
1686 {
1687 struct lagg_port *lp;
1688
1689 /* purge all the lacp ports */
1690 SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
1691 lacp_port_destroy(lp);
1692
1693 /* add them back in */
1694 SLIST_FOREACH(lp, &sc->sc_ports, lp_entries)
1695 lacp_port_create(lp);
1696 }
1697
1698 static int
1699 lagg_lacp_start(struct lagg_softc *sc, struct mbuf *m)
1700 {
1701 struct lagg_port *lp;
1702
1703 lp = lacp_select_tx_port(sc, m);
1704 if (lp == NULL) {
1705 m_freem(m);
1706 return (EBUSY);
1707 }
1708
1709 /* Send mbuf */
1710 return (lagg_enqueue(lp->lp_ifp, m));
1711 }
1712
1713 static struct mbuf *
1714 lagg_lacp_input(struct lagg_softc *sc, struct lagg_port *lp, struct mbuf *m)
1715 {
1716 struct ifnet *ifp = sc->sc_ifp;
1717 struct ether_header *eh;
1718 u_short etype;
1719
1720 eh = mtod(m, struct ether_header *);
1721 etype = ntohs(eh->ether_type);
1722
1723 /* Tap off LACP control messages */
1724 if (etype == ETHERTYPE_SLOW) {
1725 m = lacp_input(lp, m);
1726 if (m == NULL)
1727 return (NULL);
1728 }
1729
1730 /*
1731 * If the port is not collecting or not in the active aggregator then
1732 * free and return.
1733 */
1734 if (lacp_iscollecting(lp) == 0 || lacp_isactive(lp) == 0) {
1735 m_freem(m);
1736 return (NULL);
1737 }
1738
1739 m->m_pkthdr.rcvif = ifp;
1740 return (m);
1741 }
Cache object: 1d3d09f4c690a59f89b67eab8d242ad8
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