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1/*
2 * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, see <http://www.gnu.org/licenses/>.
16 *
17 * The full GNU General Public License is included in this distribution in the
18 * file called LICENSE.
19 *
20 */
21
22#include <linux/skbuff.h>
23#include <linux/netdevice.h>
24#include <linux/etherdevice.h>
25#include <linux/pkt_sched.h>
26#include <linux/spinlock.h>
27#include <linux/slab.h>
28#include <linux/timer.h>
29#include <linux/ip.h>
30#include <linux/ipv6.h>
31#include <linux/if_arp.h>
32#include <linux/if_ether.h>
33#include <linux/if_bonding.h>
34#include <linux/if_vlan.h>
35#include <linux/in.h>
36#include <net/ipx.h>
37#include <net/arp.h>
38#include <net/ipv6.h>
39#include <asm/byteorder.h>
40#include <net/bonding.h>
41#include <net/bond_alb.h>
42
43
44
45static const u8 mac_bcast[ETH_ALEN + 2] __long_aligned = {
46 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
47};
48static const u8 mac_v6_allmcast[ETH_ALEN + 2] __long_aligned = {
49 0x33, 0x33, 0x00, 0x00, 0x00, 0x01
50};
51static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
52
53#pragma pack(1)
54struct learning_pkt {
55 u8 mac_dst[ETH_ALEN];
56 u8 mac_src[ETH_ALEN];
57 __be16 type;
58 u8 padding[ETH_ZLEN - ETH_HLEN];
59};
60
61struct arp_pkt {
62 __be16 hw_addr_space;
63 __be16 prot_addr_space;
64 u8 hw_addr_len;
65 u8 prot_addr_len;
66 __be16 op_code;
67 u8 mac_src[ETH_ALEN]; /* sender hardware address */
68 __be32 ip_src; /* sender IP address */
69 u8 mac_dst[ETH_ALEN]; /* target hardware address */
70 __be32 ip_dst; /* target IP address */
71};
72#pragma pack()
73
74static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb)
75{
76 return (struct arp_pkt *)skb_network_header(skb);
77}
78
79/* Forward declaration */
80static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
81 bool strict_match);
82static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp);
83static void rlb_src_unlink(struct bonding *bond, u32 index);
84static void rlb_src_link(struct bonding *bond, u32 ip_src_hash,
85 u32 ip_dst_hash);
86
87static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
88{
89 int i;
90 u8 hash = 0;
91
92 for (i = 0; i < hash_size; i++)
93 hash ^= hash_start[i];
94
95 return hash;
96}
97
98/*********************** tlb specific functions ***************************/
99
100static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
101{
102 if (save_load) {
103 entry->load_history = 1 + entry->tx_bytes /
104 BOND_TLB_REBALANCE_INTERVAL;
105 entry->tx_bytes = 0;
106 }
107
108 entry->tx_slave = NULL;
109 entry->next = TLB_NULL_INDEX;
110 entry->prev = TLB_NULL_INDEX;
111}
112
113static inline void tlb_init_slave(struct slave *slave)
114{
115 SLAVE_TLB_INFO(slave).load = 0;
116 SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
117}
118
119static void __tlb_clear_slave(struct bonding *bond, struct slave *slave,
120 int save_load)
121{
122 struct tlb_client_info *tx_hash_table;
123 u32 index;
124
125 /* clear slave from tx_hashtbl */
126 tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
127
128 /* skip this if we've already freed the tx hash table */
129 if (tx_hash_table) {
130 index = SLAVE_TLB_INFO(slave).head;
131 while (index != TLB_NULL_INDEX) {
132 u32 next_index = tx_hash_table[index].next;
133 tlb_init_table_entry(&tx_hash_table[index], save_load);
134 index = next_index;
135 }
136 }
137
138 tlb_init_slave(slave);
139}
140
141static void tlb_clear_slave(struct bonding *bond, struct slave *slave,
142 int save_load)
143{
144 spin_lock_bh(&bond->mode_lock);
145 __tlb_clear_slave(bond, slave, save_load);
146 spin_unlock_bh(&bond->mode_lock);
147}
148
149/* Must be called before starting the monitor timer */
150static int tlb_initialize(struct bonding *bond)
151{
152 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
153 int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
154 struct tlb_client_info *new_hashtbl;
155 int i;
156
157 new_hashtbl = kzalloc(size, GFP_KERNEL);
158 if (!new_hashtbl)
159 return -ENOMEM;
160
161 spin_lock_bh(&bond->mode_lock);
162
163 bond_info->tx_hashtbl = new_hashtbl;
164
165 for (i = 0; i < TLB_HASH_TABLE_SIZE; i++)
166 tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0);
167
168 spin_unlock_bh(&bond->mode_lock);
169
170 return 0;
171}
172
173/* Must be called only after all slaves have been released */
174static void tlb_deinitialize(struct bonding *bond)
175{
176 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
177
178 spin_lock_bh(&bond->mode_lock);
179
180 kfree(bond_info->tx_hashtbl);
181 bond_info->tx_hashtbl = NULL;
182
183 spin_unlock_bh(&bond->mode_lock);
184}
185
186static long long compute_gap(struct slave *slave)
187{
188 return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */
189 (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
190}
191
192static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
193{
194 struct slave *slave, *least_loaded;
195 struct list_head *iter;
196 long long max_gap;
197
198 least_loaded = NULL;
199 max_gap = LLONG_MIN;
200
201 /* Find the slave with the largest gap */
202 bond_for_each_slave_rcu(bond, slave, iter) {
203 if (bond_slave_can_tx(slave)) {
204 long long gap = compute_gap(slave);
205
206 if (max_gap < gap) {
207 least_loaded = slave;
208 max_gap = gap;
209 }
210 }
211 }
212
213 return least_loaded;
214}
215
216static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index,
217 u32 skb_len)
218{
219 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
220 struct tlb_client_info *hash_table;
221 struct slave *assigned_slave;
222
223 hash_table = bond_info->tx_hashtbl;
224 assigned_slave = hash_table[hash_index].tx_slave;
225 if (!assigned_slave) {
226 assigned_slave = tlb_get_least_loaded_slave(bond);
227
228 if (assigned_slave) {
229 struct tlb_slave_info *slave_info =
230 &(SLAVE_TLB_INFO(assigned_slave));
231 u32 next_index = slave_info->head;
232
233 hash_table[hash_index].tx_slave = assigned_slave;
234 hash_table[hash_index].next = next_index;
235 hash_table[hash_index].prev = TLB_NULL_INDEX;
236
237 if (next_index != TLB_NULL_INDEX)
238 hash_table[next_index].prev = hash_index;
239
240 slave_info->head = hash_index;
241 slave_info->load +=
242 hash_table[hash_index].load_history;
243 }
244 }
245
246 if (assigned_slave)
247 hash_table[hash_index].tx_bytes += skb_len;
248
249 return assigned_slave;
250}
251
252static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index,
253 u32 skb_len)
254{
255 struct slave *tx_slave;
256
257 /* We don't need to disable softirq here, becase
258 * tlb_choose_channel() is only called by bond_alb_xmit()
259 * which already has softirq disabled.
260 */
261 spin_lock(&bond->mode_lock);
262 tx_slave = __tlb_choose_channel(bond, hash_index, skb_len);
263 spin_unlock(&bond->mode_lock);
264
265 return tx_slave;
266}
267
268/*********************** rlb specific functions ***************************/
269
270/* when an ARP REPLY is received from a client update its info
271 * in the rx_hashtbl
272 */
273static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
274{
275 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
276 struct rlb_client_info *client_info;
277 u32 hash_index;
278
279 spin_lock_bh(&bond->mode_lock);
280
281 hash_index = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
282 client_info = &(bond_info->rx_hashtbl[hash_index]);
283
284 if ((client_info->assigned) &&
285 (client_info->ip_src == arp->ip_dst) &&
286 (client_info->ip_dst == arp->ip_src) &&
287 (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) {
288 /* update the clients MAC address */
289 ether_addr_copy(client_info->mac_dst, arp->mac_src);
290 client_info->ntt = 1;
291 bond_info->rx_ntt = 1;
292 }
293
294 spin_unlock_bh(&bond->mode_lock);
295}
296
297static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond,
298 struct slave *slave)
299{
300 struct arp_pkt *arp, _arp;
301
302 if (skb->protocol != cpu_to_be16(ETH_P_ARP))
303 goto out;
304
305 arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp);
306 if (!arp)
307 goto out;
308
309 /* We received an ARP from arp->ip_src.
310 * We might have used this IP address previously (on the bonding host
311 * itself or on a system that is bridged together with the bond).
312 * However, if arp->mac_src is different than what is stored in
313 * rx_hashtbl, some other host is now using the IP and we must prevent
314 * sending out client updates with this IP address and the old MAC
315 * address.
316 * Clean up all hash table entries that have this address as ip_src but
317 * have a different mac_src.
318 */
319 rlb_purge_src_ip(bond, arp);
320
321 if (arp->op_code == htons(ARPOP_REPLY)) {
322 /* update rx hash table for this ARP */
323 rlb_update_entry_from_arp(bond, arp);
324 netdev_dbg(bond->dev, "Server received an ARP Reply from client\n");
325 }
326out:
327 return RX_HANDLER_ANOTHER;
328}
329
330/* Caller must hold rcu_read_lock() */
331static struct slave *__rlb_next_rx_slave(struct bonding *bond)
332{
333 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
334 struct slave *before = NULL, *rx_slave = NULL, *slave;
335 struct list_head *iter;
336 bool found = false;
337
338 bond_for_each_slave_rcu(bond, slave, iter) {
339 if (!bond_slave_can_tx(slave))
340 continue;
341 if (!found) {
342 if (!before || before->speed < slave->speed)
343 before = slave;
344 } else {
345 if (!rx_slave || rx_slave->speed < slave->speed)
346 rx_slave = slave;
347 }
348 if (slave == bond_info->rx_slave)
349 found = true;
350 }
351 /* we didn't find anything after the current or we have something
352 * better before and up to the current slave
353 */
354 if (!rx_slave || (before && rx_slave->speed < before->speed))
355 rx_slave = before;
356
357 if (rx_slave)
358 bond_info->rx_slave = rx_slave;
359
360 return rx_slave;
361}
362
363/* Caller must hold RTNL, rcu_read_lock is obtained only to silence checkers */
364static struct slave *rlb_next_rx_slave(struct bonding *bond)
365{
366 struct slave *rx_slave;
367
368 ASSERT_RTNL();
369
370 rcu_read_lock();
371 rx_slave = __rlb_next_rx_slave(bond);
372 rcu_read_unlock();
373
374 return rx_slave;
375}
376
377/* teach the switch the mac of a disabled slave
378 * on the primary for fault tolerance
379 *
380 * Caller must hold RTNL
381 */
382static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
383{
384 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
385
386 if (!curr_active)
387 return;
388
389 if (!bond->alb_info.primary_is_promisc) {
390 if (!dev_set_promiscuity(curr_active->dev, 1))
391 bond->alb_info.primary_is_promisc = 1;
392 else
393 bond->alb_info.primary_is_promisc = 0;
394 }
395
396 bond->alb_info.rlb_promisc_timeout_counter = 0;
397
398 alb_send_learning_packets(curr_active, addr, true);
399}
400
401/* slave being removed should not be active at this point
402 *
403 * Caller must hold rtnl.
404 */
405static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
406{
407 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
408 struct rlb_client_info *rx_hash_table;
409 u32 index, next_index;
410
411 /* clear slave from rx_hashtbl */
412 spin_lock_bh(&bond->mode_lock);
413
414 rx_hash_table = bond_info->rx_hashtbl;
415 index = bond_info->rx_hashtbl_used_head;
416 for (; index != RLB_NULL_INDEX; index = next_index) {
417 next_index = rx_hash_table[index].used_next;
418 if (rx_hash_table[index].slave == slave) {
419 struct slave *assigned_slave = rlb_next_rx_slave(bond);
420
421 if (assigned_slave) {
422 rx_hash_table[index].slave = assigned_slave;
423 if (!ether_addr_equal_64bits(rx_hash_table[index].mac_dst,
424 mac_bcast)) {
425 bond_info->rx_hashtbl[index].ntt = 1;
426 bond_info->rx_ntt = 1;
427 /* A slave has been removed from the
428 * table because it is either disabled
429 * or being released. We must retry the
430 * update to avoid clients from not
431 * being updated & disconnecting when
432 * there is stress
433 */
434 bond_info->rlb_update_retry_counter =
435 RLB_UPDATE_RETRY;
436 }
437 } else { /* there is no active slave */
438 rx_hash_table[index].slave = NULL;
439 }
440 }
441 }
442
443 spin_unlock_bh(&bond->mode_lock);
444
445 if (slave != rtnl_dereference(bond->curr_active_slave))
446 rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
447}
448
449static void rlb_update_client(struct rlb_client_info *client_info)
450{
451 int i;
452
453 if (!client_info->slave || !is_valid_ether_addr(client_info->mac_dst))
454 return;
455
456 for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
457 struct sk_buff *skb;
458
459 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
460 client_info->ip_dst,
461 client_info->slave->dev,
462 client_info->ip_src,
463 client_info->mac_dst,
464 client_info->slave->dev->dev_addr,
465 client_info->mac_dst);
466 if (!skb) {
467 netdev_err(client_info->slave->bond->dev,
468 "failed to create an ARP packet\n");
469 continue;
470 }
471
472 skb->dev = client_info->slave->dev;
473
474 if (client_info->vlan_id) {
475 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
476 client_info->vlan_id);
477 }
478
479 arp_xmit(skb);
480 }
481}
482
483/* sends ARP REPLIES that update the clients that need updating */
484static void rlb_update_rx_clients(struct bonding *bond)
485{
486 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
487 struct rlb_client_info *client_info;
488 u32 hash_index;
489
490 spin_lock_bh(&bond->mode_lock);
491
492 hash_index = bond_info->rx_hashtbl_used_head;
493 for (; hash_index != RLB_NULL_INDEX;
494 hash_index = client_info->used_next) {
495 client_info = &(bond_info->rx_hashtbl[hash_index]);
496 if (client_info->ntt) {
497 rlb_update_client(client_info);
498 if (bond_info->rlb_update_retry_counter == 0)
499 client_info->ntt = 0;
500 }
501 }
502
503 /* do not update the entries again until this counter is zero so that
504 * not to confuse the clients.
505 */
506 bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
507
508 spin_unlock_bh(&bond->mode_lock);
509}
510
511/* The slave was assigned a new mac address - update the clients */
512static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
513{
514 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
515 struct rlb_client_info *client_info;
516 int ntt = 0;
517 u32 hash_index;
518
519 spin_lock_bh(&bond->mode_lock);
520
521 hash_index = bond_info->rx_hashtbl_used_head;
522 for (; hash_index != RLB_NULL_INDEX;
523 hash_index = client_info->used_next) {
524 client_info = &(bond_info->rx_hashtbl[hash_index]);
525
526 if ((client_info->slave == slave) &&
527 !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
528 client_info->ntt = 1;
529 ntt = 1;
530 }
531 }
532
533 /* update the team's flag only after the whole iteration */
534 if (ntt) {
535 bond_info->rx_ntt = 1;
536 /* fasten the change */
537 bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
538 }
539
540 spin_unlock_bh(&bond->mode_lock);
541}
542
543/* mark all clients using src_ip to be updated */
544static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
545{
546 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
547 struct rlb_client_info *client_info;
548 u32 hash_index;
549
550 spin_lock(&bond->mode_lock);
551
552 hash_index = bond_info->rx_hashtbl_used_head;
553 for (; hash_index != RLB_NULL_INDEX;
554 hash_index = client_info->used_next) {
555 client_info = &(bond_info->rx_hashtbl[hash_index]);
556
557 if (!client_info->slave) {
558 netdev_err(bond->dev, "found a client with no channel in the client's hash table\n");
559 continue;
560 }
561 /* update all clients using this src_ip, that are not assigned
562 * to the team's address (curr_active_slave) and have a known
563 * unicast mac address.
564 */
565 if ((client_info->ip_src == src_ip) &&
566 !ether_addr_equal_64bits(client_info->slave->dev->dev_addr,
567 bond->dev->dev_addr) &&
568 !ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
569 client_info->ntt = 1;
570 bond_info->rx_ntt = 1;
571 }
572 }
573
574 spin_unlock(&bond->mode_lock);
575}
576
577static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond)
578{
579 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
580 struct arp_pkt *arp = arp_pkt(skb);
581 struct slave *assigned_slave, *curr_active_slave;
582 struct rlb_client_info *client_info;
583 u32 hash_index = 0;
584
585 spin_lock(&bond->mode_lock);
586
587 curr_active_slave = rcu_dereference(bond->curr_active_slave);
588
589 hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst));
590 client_info = &(bond_info->rx_hashtbl[hash_index]);
591
592 if (client_info->assigned) {
593 if ((client_info->ip_src == arp->ip_src) &&
594 (client_info->ip_dst == arp->ip_dst)) {
595 /* the entry is already assigned to this client */
596 if (!ether_addr_equal_64bits(arp->mac_dst, mac_bcast)) {
597 /* update mac address from arp */
598 ether_addr_copy(client_info->mac_dst, arp->mac_dst);
599 }
600 ether_addr_copy(client_info->mac_src, arp->mac_src);
601
602 assigned_slave = client_info->slave;
603 if (assigned_slave) {
604 spin_unlock(&bond->mode_lock);
605 return assigned_slave;
606 }
607 } else {
608 /* the entry is already assigned to some other client,
609 * move the old client to primary (curr_active_slave) so
610 * that the new client can be assigned to this entry.
611 */
612 if (curr_active_slave &&
613 client_info->slave != curr_active_slave) {
614 client_info->slave = curr_active_slave;
615 rlb_update_client(client_info);
616 }
617 }
618 }
619 /* assign a new slave */
620 assigned_slave = __rlb_next_rx_slave(bond);
621
622 if (assigned_slave) {
623 if (!(client_info->assigned &&
624 client_info->ip_src == arp->ip_src)) {
625 /* ip_src is going to be updated,
626 * fix the src hash list
627 */
628 u32 hash_src = _simple_hash((u8 *)&arp->ip_src,
629 sizeof(arp->ip_src));
630 rlb_src_unlink(bond, hash_index);
631 rlb_src_link(bond, hash_src, hash_index);
632 }
633
634 client_info->ip_src = arp->ip_src;
635 client_info->ip_dst = arp->ip_dst;
636 /* arp->mac_dst is broadcast for arp reqeusts.
637 * will be updated with clients actual unicast mac address
638 * upon receiving an arp reply.
639 */
640 ether_addr_copy(client_info->mac_dst, arp->mac_dst);
641 ether_addr_copy(client_info->mac_src, arp->mac_src);
642 client_info->slave = assigned_slave;
643
644 if (!ether_addr_equal_64bits(client_info->mac_dst, mac_bcast)) {
645 client_info->ntt = 1;
646 bond->alb_info.rx_ntt = 1;
647 } else {
648 client_info->ntt = 0;
649 }
650
651 if (vlan_get_tag(skb, &client_info->vlan_id))
652 client_info->vlan_id = 0;
653
654 if (!client_info->assigned) {
655 u32 prev_tbl_head = bond_info->rx_hashtbl_used_head;
656 bond_info->rx_hashtbl_used_head = hash_index;
657 client_info->used_next = prev_tbl_head;
658 if (prev_tbl_head != RLB_NULL_INDEX) {
659 bond_info->rx_hashtbl[prev_tbl_head].used_prev =
660 hash_index;
661 }
662 client_info->assigned = 1;
663 }
664 }
665
666 spin_unlock(&bond->mode_lock);
667
668 return assigned_slave;
669}
670
671/* chooses (and returns) transmit channel for arp reply
672 * does not choose channel for other arp types since they are
673 * sent on the curr_active_slave
674 */
675static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
676{
677 struct arp_pkt *arp = arp_pkt(skb);
678 struct slave *tx_slave = NULL;
679
680 /* Don't modify or load balance ARPs that do not originate locally
681 * (e.g.,arrive via a bridge).
682 */
683 if (!bond_slave_has_mac_rx(bond, arp->mac_src))
684 return NULL;
685
686 if (arp->op_code == htons(ARPOP_REPLY)) {
687 /* the arp must be sent on the selected rx channel */
688 tx_slave = rlb_choose_channel(skb, bond);
689 if (tx_slave)
690 bond_hw_addr_copy(arp->mac_src, tx_slave->dev->dev_addr,
691 tx_slave->dev->addr_len);
692 netdev_dbg(bond->dev, "Server sent ARP Reply packet\n");
693 } else if (arp->op_code == htons(ARPOP_REQUEST)) {
694 /* Create an entry in the rx_hashtbl for this client as a
695 * place holder.
696 * When the arp reply is received the entry will be updated
697 * with the correct unicast address of the client.
698 */
699 rlb_choose_channel(skb, bond);
700
701 /* The ARP reply packets must be delayed so that
702 * they can cancel out the influence of the ARP request.
703 */
704 bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
705
706 /* arp requests are broadcast and are sent on the primary
707 * the arp request will collapse all clients on the subnet to
708 * the primary slave. We must register these clients to be
709 * updated with their assigned mac.
710 */
711 rlb_req_update_subnet_clients(bond, arp->ip_src);
712 netdev_dbg(bond->dev, "Server sent ARP Request packet\n");
713 }
714
715 return tx_slave;
716}
717
718static void rlb_rebalance(struct bonding *bond)
719{
720 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
721 struct slave *assigned_slave;
722 struct rlb_client_info *client_info;
723 int ntt;
724 u32 hash_index;
725
726 spin_lock_bh(&bond->mode_lock);
727
728 ntt = 0;
729 hash_index = bond_info->rx_hashtbl_used_head;
730 for (; hash_index != RLB_NULL_INDEX;
731 hash_index = client_info->used_next) {
732 client_info = &(bond_info->rx_hashtbl[hash_index]);
733 assigned_slave = __rlb_next_rx_slave(bond);
734 if (assigned_slave && (client_info->slave != assigned_slave)) {
735 client_info->slave = assigned_slave;
736 client_info->ntt = 1;
737 ntt = 1;
738 }
739 }
740
741 /* update the team's flag only after the whole iteration */
742 if (ntt)
743 bond_info->rx_ntt = 1;
744 spin_unlock_bh(&bond->mode_lock);
745}
746
747/* Caller must hold mode_lock */
748static void rlb_init_table_entry_dst(struct rlb_client_info *entry)
749{
750 entry->used_next = RLB_NULL_INDEX;
751 entry->used_prev = RLB_NULL_INDEX;
752 entry->assigned = 0;
753 entry->slave = NULL;
754 entry->vlan_id = 0;
755}
756static void rlb_init_table_entry_src(struct rlb_client_info *entry)
757{
758 entry->src_first = RLB_NULL_INDEX;
759 entry->src_prev = RLB_NULL_INDEX;
760 entry->src_next = RLB_NULL_INDEX;
761}
762
763static void rlb_init_table_entry(struct rlb_client_info *entry)
764{
765 memset(entry, 0, sizeof(struct rlb_client_info));
766 rlb_init_table_entry_dst(entry);
767 rlb_init_table_entry_src(entry);
768}
769
770static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index)
771{
772 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
773 u32 next_index = bond_info->rx_hashtbl[index].used_next;
774 u32 prev_index = bond_info->rx_hashtbl[index].used_prev;
775
776 if (index == bond_info->rx_hashtbl_used_head)
777 bond_info->rx_hashtbl_used_head = next_index;
778 if (prev_index != RLB_NULL_INDEX)
779 bond_info->rx_hashtbl[prev_index].used_next = next_index;
780 if (next_index != RLB_NULL_INDEX)
781 bond_info->rx_hashtbl[next_index].used_prev = prev_index;
782}
783
784/* unlink a rlb hash table entry from the src list */
785static void rlb_src_unlink(struct bonding *bond, u32 index)
786{
787 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
788 u32 next_index = bond_info->rx_hashtbl[index].src_next;
789 u32 prev_index = bond_info->rx_hashtbl[index].src_prev;
790
791 bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX;
792 bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX;
793
794 if (next_index != RLB_NULL_INDEX)
795 bond_info->rx_hashtbl[next_index].src_prev = prev_index;
796
797 if (prev_index == RLB_NULL_INDEX)
798 return;
799
800 /* is prev_index pointing to the head of this list? */
801 if (bond_info->rx_hashtbl[prev_index].src_first == index)
802 bond_info->rx_hashtbl[prev_index].src_first = next_index;
803 else
804 bond_info->rx_hashtbl[prev_index].src_next = next_index;
805
806}
807
808static void rlb_delete_table_entry(struct bonding *bond, u32 index)
809{
810 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
811 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
812
813 rlb_delete_table_entry_dst(bond, index);
814 rlb_init_table_entry_dst(entry);
815
816 rlb_src_unlink(bond, index);
817}
818
819/* add the rx_hashtbl[ip_dst_hash] entry to the list
820 * of entries with identical ip_src_hash
821 */
822static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash)
823{
824 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
825 u32 next;
826
827 bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash;
828 next = bond_info->rx_hashtbl[ip_src_hash].src_first;
829 bond_info->rx_hashtbl[ip_dst_hash].src_next = next;
830 if (next != RLB_NULL_INDEX)
831 bond_info->rx_hashtbl[next].src_prev = ip_dst_hash;
832 bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash;
833}
834
835/* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does
836 * not match arp->mac_src
837 */
838static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp)
839{
840 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
841 u32 ip_src_hash = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
842 u32 index;
843
844 spin_lock_bh(&bond->mode_lock);
845
846 index = bond_info->rx_hashtbl[ip_src_hash].src_first;
847 while (index != RLB_NULL_INDEX) {
848 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
849 u32 next_index = entry->src_next;
850 if (entry->ip_src == arp->ip_src &&
851 !ether_addr_equal_64bits(arp->mac_src, entry->mac_src))
852 rlb_delete_table_entry(bond, index);
853 index = next_index;
854 }
855 spin_unlock_bh(&bond->mode_lock);
856}
857
858static int rlb_initialize(struct bonding *bond)
859{
860 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
861 struct rlb_client_info *new_hashtbl;
862 int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
863 int i;
864
865 new_hashtbl = kmalloc(size, GFP_KERNEL);
866 if (!new_hashtbl)
867 return -1;
868
869 spin_lock_bh(&bond->mode_lock);
870
871 bond_info->rx_hashtbl = new_hashtbl;
872
873 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
874
875 for (i = 0; i < RLB_HASH_TABLE_SIZE; i++)
876 rlb_init_table_entry(bond_info->rx_hashtbl + i);
877
878 spin_unlock_bh(&bond->mode_lock);
879
880 /* register to receive ARPs */
881 bond->recv_probe = rlb_arp_recv;
882
883 return 0;
884}
885
886static void rlb_deinitialize(struct bonding *bond)
887{
888 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
889
890 spin_lock_bh(&bond->mode_lock);
891
892 kfree(bond_info->rx_hashtbl);
893 bond_info->rx_hashtbl = NULL;
894 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
895
896 spin_unlock_bh(&bond->mode_lock);
897}
898
899static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
900{
901 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
902 u32 curr_index;
903
904 spin_lock_bh(&bond->mode_lock);
905
906 curr_index = bond_info->rx_hashtbl_used_head;
907 while (curr_index != RLB_NULL_INDEX) {
908 struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
909 u32 next_index = bond_info->rx_hashtbl[curr_index].used_next;
910
911 if (curr->vlan_id == vlan_id)
912 rlb_delete_table_entry(bond, curr_index);
913
914 curr_index = next_index;
915 }
916
917 spin_unlock_bh(&bond->mode_lock);
918}
919
920/*********************** tlb/rlb shared functions *********************/
921
922static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[],
923 __be16 vlan_proto, u16 vid)
924{
925 struct learning_pkt pkt;
926 struct sk_buff *skb;
927 int size = sizeof(struct learning_pkt);
928
929 memset(&pkt, 0, size);
930 ether_addr_copy(pkt.mac_dst, mac_addr);
931 ether_addr_copy(pkt.mac_src, mac_addr);
932 pkt.type = cpu_to_be16(ETH_P_LOOPBACK);
933
934 skb = dev_alloc_skb(size);
935 if (!skb)
936 return;
937
938 skb_put_data(skb, &pkt, size);
939
940 skb_reset_mac_header(skb);
941 skb->network_header = skb->mac_header + ETH_HLEN;
942 skb->protocol = pkt.type;
943 skb->priority = TC_PRIO_CONTROL;
944 skb->dev = slave->dev;
945
946 netdev_dbg(slave->bond->dev,
947 "Send learning packet: dev %s mac %pM vlan %d\n",
948 slave->dev->name, mac_addr, vid);
949
950 if (vid)
951 __vlan_hwaccel_put_tag(skb, vlan_proto, vid);
952
953 dev_queue_xmit(skb);
954}
955
956struct alb_walk_data {
957 struct bonding *bond;
958 struct slave *slave;
959 u8 *mac_addr;
960 bool strict_match;
961};
962
963static int alb_upper_dev_walk(struct net_device *upper, void *_data)
964{
965 struct alb_walk_data *data = _data;
966 bool strict_match = data->strict_match;
967 struct bonding *bond = data->bond;
968 struct slave *slave = data->slave;
969 u8 *mac_addr = data->mac_addr;
970 struct bond_vlan_tag *tags;
971
972 if (is_vlan_dev(upper) &&
973 bond->nest_level == vlan_get_encap_level(upper) - 1) {
974 if (upper->addr_assign_type == NET_ADDR_STOLEN) {
975 alb_send_lp_vid(slave, mac_addr,
976 vlan_dev_vlan_proto(upper),
977 vlan_dev_vlan_id(upper));
978 } else {
979 alb_send_lp_vid(slave, upper->dev_addr,
980 vlan_dev_vlan_proto(upper),
981 vlan_dev_vlan_id(upper));
982 }
983 }
984
985 /* If this is a macvlan device, then only send updates
986 * when strict_match is turned off.
987 */
988 if (netif_is_macvlan(upper) && !strict_match) {
989 tags = bond_verify_device_path(bond->dev, upper, 0);
990 if (IS_ERR_OR_NULL(tags))
991 BUG();
992 alb_send_lp_vid(slave, upper->dev_addr,
993 tags[0].vlan_proto, tags[0].vlan_id);
994 kfree(tags);
995 }
996
997 return 0;
998}
999
1000static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
1001 bool strict_match)
1002{
1003 struct bonding *bond = bond_get_bond_by_slave(slave);
1004 struct alb_walk_data data = {
1005 .strict_match = strict_match,
1006 .mac_addr = mac_addr,
1007 .slave = slave,
1008 .bond = bond,
1009 };
1010
1011 /* send untagged */
1012 alb_send_lp_vid(slave, mac_addr, 0, 0);
1013
1014 /* loop through all devices and see if we need to send a packet
1015 * for that device.
1016 */
1017 rcu_read_lock();
1018 netdev_walk_all_upper_dev_rcu(bond->dev, alb_upper_dev_walk, &data);
1019 rcu_read_unlock();
1020}
1021
1022static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[],
1023 unsigned int len)
1024{
1025 struct net_device *dev = slave->dev;
1026 struct sockaddr_storage ss;
1027
1028 if (BOND_MODE(slave->bond) == BOND_MODE_TLB) {
1029 memcpy(dev->dev_addr, addr, len);
1030 return 0;
1031 }
1032
1033 /* for rlb each slave must have a unique hw mac addresses so that
1034 * each slave will receive packets destined to a different mac
1035 */
1036 memcpy(ss.__data, addr, len);
1037 ss.ss_family = dev->type;
1038 if (dev_set_mac_address(dev, (struct sockaddr *)&ss)) {
1039 netdev_err(slave->bond->dev, "dev_set_mac_address of dev %s failed! ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n",
1040 dev->name);
1041 return -EOPNOTSUPP;
1042 }
1043 return 0;
1044}
1045
1046/* Swap MAC addresses between two slaves.
1047 *
1048 * Called with RTNL held, and no other locks.
1049 */
1050static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2)
1051{
1052 u8 tmp_mac_addr[MAX_ADDR_LEN];
1053
1054 bond_hw_addr_copy(tmp_mac_addr, slave1->dev->dev_addr,
1055 slave1->dev->addr_len);
1056 alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr,
1057 slave2->dev->addr_len);
1058 alb_set_slave_mac_addr(slave2, tmp_mac_addr,
1059 slave1->dev->addr_len);
1060
1061}
1062
1063/* Send learning packets after MAC address swap.
1064 *
1065 * Called with RTNL and no other locks
1066 */
1067static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
1068 struct slave *slave2)
1069{
1070 int slaves_state_differ = (bond_slave_can_tx(slave1) != bond_slave_can_tx(slave2));
1071 struct slave *disabled_slave = NULL;
1072
1073 ASSERT_RTNL();
1074
1075 /* fasten the change in the switch */
1076 if (bond_slave_can_tx(slave1)) {
1077 alb_send_learning_packets(slave1, slave1->dev->dev_addr, false);
1078 if (bond->alb_info.rlb_enabled) {
1079 /* inform the clients that the mac address
1080 * has changed
1081 */
1082 rlb_req_update_slave_clients(bond, slave1);
1083 }
1084 } else {
1085 disabled_slave = slave1;
1086 }
1087
1088 if (bond_slave_can_tx(slave2)) {
1089 alb_send_learning_packets(slave2, slave2->dev->dev_addr, false);
1090 if (bond->alb_info.rlb_enabled) {
1091 /* inform the clients that the mac address
1092 * has changed
1093 */
1094 rlb_req_update_slave_clients(bond, slave2);
1095 }
1096 } else {
1097 disabled_slave = slave2;
1098 }
1099
1100 if (bond->alb_info.rlb_enabled && slaves_state_differ) {
1101 /* A disabled slave was assigned an active mac addr */
1102 rlb_teach_disabled_mac_on_primary(bond,
1103 disabled_slave->dev->dev_addr);
1104 }
1105}
1106
1107/**
1108 * alb_change_hw_addr_on_detach
1109 * @bond: bonding we're working on
1110 * @slave: the slave that was just detached
1111 *
1112 * We assume that @slave was already detached from the slave list.
1113 *
1114 * If @slave's permanent hw address is different both from its current
1115 * address and from @bond's address, then somewhere in the bond there's
1116 * a slave that has @slave's permanet address as its current address.
1117 * We'll make sure that that slave no longer uses @slave's permanent address.
1118 *
1119 * Caller must hold RTNL and no other locks
1120 */
1121static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1122{
1123 int perm_curr_diff;
1124 int perm_bond_diff;
1125 struct slave *found_slave;
1126
1127 perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1128 slave->dev->dev_addr);
1129 perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1130 bond->dev->dev_addr);
1131
1132 if (perm_curr_diff && perm_bond_diff) {
1133 found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr);
1134
1135 if (found_slave) {
1136 alb_swap_mac_addr(slave, found_slave);
1137 alb_fasten_mac_swap(bond, slave, found_slave);
1138 }
1139 }
1140}
1141
1142/**
1143 * alb_handle_addr_collision_on_attach
1144 * @bond: bonding we're working on
1145 * @slave: the slave that was just attached
1146 *
1147 * checks uniqueness of slave's mac address and handles the case the
1148 * new slave uses the bonds mac address.
1149 *
1150 * If the permanent hw address of @slave is @bond's hw address, we need to
1151 * find a different hw address to give @slave, that isn't in use by any other
1152 * slave in the bond. This address must be, of course, one of the permanent
1153 * addresses of the other slaves.
1154 *
1155 * We go over the slave list, and for each slave there we compare its
1156 * permanent hw address with the current address of all the other slaves.
1157 * If no match was found, then we've found a slave with a permanent address
1158 * that isn't used by any other slave in the bond, so we can assign it to
1159 * @slave.
1160 *
1161 * assumption: this function is called before @slave is attached to the
1162 * bond slave list.
1163 */
1164static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1165{
1166 struct slave *has_bond_addr = rcu_access_pointer(bond->curr_active_slave);
1167 struct slave *tmp_slave1, *free_mac_slave = NULL;
1168 struct list_head *iter;
1169
1170 if (!bond_has_slaves(bond)) {
1171 /* this is the first slave */
1172 return 0;
1173 }
1174
1175 /* if slave's mac address differs from bond's mac address
1176 * check uniqueness of slave's mac address against the other
1177 * slaves in the bond.
1178 */
1179 if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
1180 if (!bond_slave_has_mac(bond, slave->dev->dev_addr))
1181 return 0;
1182
1183 /* Try setting slave mac to bond address and fall-through
1184 * to code handling that situation below...
1185 */
1186 alb_set_slave_mac_addr(slave, bond->dev->dev_addr,
1187 bond->dev->addr_len);
1188 }
1189
1190 /* The slave's address is equal to the address of the bond.
1191 * Search for a spare address in the bond for this slave.
1192 */
1193 bond_for_each_slave(bond, tmp_slave1, iter) {
1194 if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) {
1195 /* no slave has tmp_slave1's perm addr
1196 * as its curr addr
1197 */
1198 free_mac_slave = tmp_slave1;
1199 break;
1200 }
1201
1202 if (!has_bond_addr) {
1203 if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr,
1204 bond->dev->dev_addr)) {
1205
1206 has_bond_addr = tmp_slave1;
1207 }
1208 }
1209 }
1210
1211 if (free_mac_slave) {
1212 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr,
1213 free_mac_slave->dev->addr_len);
1214
1215 netdev_warn(bond->dev, "the hw address of slave %s is in use by the bond; giving it the hw address of %s\n",
1216 slave->dev->name, free_mac_slave->dev->name);
1217
1218 } else if (has_bond_addr) {
1219 netdev_err(bond->dev, "the hw address of slave %s is in use by the bond; couldn't find a slave with a free hw address to give it (this should not have happened)\n",
1220 slave->dev->name);
1221 return -EFAULT;
1222 }
1223
1224 return 0;
1225}
1226
1227/**
1228 * alb_set_mac_address
1229 * @bond:
1230 * @addr:
1231 *
1232 * In TLB mode all slaves are configured to the bond's hw address, but set
1233 * their dev_addr field to different addresses (based on their permanent hw
1234 * addresses).
1235 *
1236 * For each slave, this function sets the interface to the new address and then
1237 * changes its dev_addr field to its previous value.
1238 *
1239 * Unwinding assumes bond's mac address has not yet changed.
1240 */
1241static int alb_set_mac_address(struct bonding *bond, void *addr)
1242{
1243 struct slave *slave, *rollback_slave;
1244 struct list_head *iter;
1245 struct sockaddr_storage ss;
1246 char tmp_addr[MAX_ADDR_LEN];
1247 int res;
1248
1249 if (bond->alb_info.rlb_enabled)
1250 return 0;
1251
1252 bond_for_each_slave(bond, slave, iter) {
1253 /* save net_device's current hw address */
1254 bond_hw_addr_copy(tmp_addr, slave->dev->dev_addr,
1255 slave->dev->addr_len);
1256
1257 res = dev_set_mac_address(slave->dev, addr);
1258
1259 /* restore net_device's hw address */
1260 bond_hw_addr_copy(slave->dev->dev_addr, tmp_addr,
1261 slave->dev->addr_len);
1262
1263 if (res)
1264 goto unwind;
1265 }
1266
1267 return 0;
1268
1269unwind:
1270 memcpy(ss.__data, bond->dev->dev_addr, bond->dev->addr_len);
1271 ss.ss_family = bond->dev->type;
1272
1273 /* unwind from head to the slave that failed */
1274 bond_for_each_slave(bond, rollback_slave, iter) {
1275 if (rollback_slave == slave)
1276 break;
1277 bond_hw_addr_copy(tmp_addr, rollback_slave->dev->dev_addr,
1278 rollback_slave->dev->addr_len);
1279 dev_set_mac_address(rollback_slave->dev,
1280 (struct sockaddr *)&ss);
1281 bond_hw_addr_copy(rollback_slave->dev->dev_addr, tmp_addr,
1282 rollback_slave->dev->addr_len);
1283 }
1284
1285 return res;
1286}
1287
1288/************************ exported alb funcions ************************/
1289
1290int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1291{
1292 int res;
1293
1294 res = tlb_initialize(bond);
1295 if (res)
1296 return res;
1297
1298 if (rlb_enabled) {
1299 bond->alb_info.rlb_enabled = 1;
1300 res = rlb_initialize(bond);
1301 if (res) {
1302 tlb_deinitialize(bond);
1303 return res;
1304 }
1305 } else {
1306 bond->alb_info.rlb_enabled = 0;
1307 }
1308
1309 return 0;
1310}
1311
1312void bond_alb_deinitialize(struct bonding *bond)
1313{
1314 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1315
1316 tlb_deinitialize(bond);
1317
1318 if (bond_info->rlb_enabled)
1319 rlb_deinitialize(bond);
1320}
1321
1322static int bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond,
1323 struct slave *tx_slave)
1324{
1325 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1326 struct ethhdr *eth_data = eth_hdr(skb);
1327
1328 if (!tx_slave) {
1329 /* unbalanced or unassigned, send through primary */
1330 tx_slave = rcu_dereference(bond->curr_active_slave);
1331 if (bond->params.tlb_dynamic_lb)
1332 bond_info->unbalanced_load += skb->len;
1333 }
1334
1335 if (tx_slave && bond_slave_can_tx(tx_slave)) {
1336 if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) {
1337 ether_addr_copy(eth_data->h_source,
1338 tx_slave->dev->dev_addr);
1339 }
1340
1341 bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1342 goto out;
1343 }
1344
1345 if (tx_slave && bond->params.tlb_dynamic_lb) {
1346 spin_lock(&bond->mode_lock);
1347 __tlb_clear_slave(bond, tx_slave, 0);
1348 spin_unlock(&bond->mode_lock);
1349 }
1350
1351 /* no suitable interface, frame not sent */
1352 bond_tx_drop(bond->dev, skb);
1353out:
1354 return NETDEV_TX_OK;
1355}
1356
1357int bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1358{
1359 struct bonding *bond = netdev_priv(bond_dev);
1360 struct ethhdr *eth_data;
1361 struct slave *tx_slave = NULL;
1362 u32 hash_index;
1363
1364 skb_reset_mac_header(skb);
1365 eth_data = eth_hdr(skb);
1366
1367 /* Do not TX balance any multicast or broadcast */
1368 if (!is_multicast_ether_addr(eth_data->h_dest)) {
1369 switch (skb->protocol) {
1370 case htons(ETH_P_IP):
1371 case htons(ETH_P_IPX):
1372 /* In case of IPX, it will falback to L2 hash */
1373 case htons(ETH_P_IPV6):
1374 hash_index = bond_xmit_hash(bond, skb);
1375 if (bond->params.tlb_dynamic_lb) {
1376 tx_slave = tlb_choose_channel(bond,
1377 hash_index & 0xFF,
1378 skb->len);
1379 } else {
1380 struct bond_up_slave *slaves;
1381 unsigned int count;
1382
1383 slaves = rcu_dereference(bond->slave_arr);
1384 count = slaves ? READ_ONCE(slaves->count) : 0;
1385 if (likely(count))
1386 tx_slave = slaves->arr[hash_index %
1387 count];
1388 }
1389 break;
1390 }
1391 }
1392 return bond_do_alb_xmit(skb, bond, tx_slave);
1393}
1394
1395int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1396{
1397 struct bonding *bond = netdev_priv(bond_dev);
1398 struct ethhdr *eth_data;
1399 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1400 struct slave *tx_slave = NULL;
1401 static const __be32 ip_bcast = htonl(0xffffffff);
1402 int hash_size = 0;
1403 bool do_tx_balance = true;
1404 u32 hash_index = 0;
1405 const u8 *hash_start = NULL;
1406 struct ipv6hdr *ip6hdr;
1407
1408 skb_reset_mac_header(skb);
1409 eth_data = eth_hdr(skb);
1410
1411 switch (ntohs(skb->protocol)) {
1412 case ETH_P_IP: {
1413 const struct iphdr *iph = ip_hdr(skb);
1414
1415 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast) ||
1416 (iph->daddr == ip_bcast) ||
1417 (iph->protocol == IPPROTO_IGMP)) {
1418 do_tx_balance = false;
1419 break;
1420 }
1421 hash_start = (char *)&(iph->daddr);
1422 hash_size = sizeof(iph->daddr);
1423 }
1424 break;
1425 case ETH_P_IPV6:
1426 /* IPv6 doesn't really use broadcast mac address, but leave
1427 * that here just in case.
1428 */
1429 if (ether_addr_equal_64bits(eth_data->h_dest, mac_bcast)) {
1430 do_tx_balance = false;
1431 break;
1432 }
1433
1434 /* IPv6 uses all-nodes multicast as an equivalent to
1435 * broadcasts in IPv4.
1436 */
1437 if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) {
1438 do_tx_balance = false;
1439 break;
1440 }
1441
1442 /* Additianally, DAD probes should not be tx-balanced as that
1443 * will lead to false positives for duplicate addresses and
1444 * prevent address configuration from working.
1445 */
1446 ip6hdr = ipv6_hdr(skb);
1447 if (ipv6_addr_any(&ip6hdr->saddr)) {
1448 do_tx_balance = false;
1449 break;
1450 }
1451
1452 hash_start = (char *)&(ipv6_hdr(skb)->daddr);
1453 hash_size = sizeof(ipv6_hdr(skb)->daddr);
1454 break;
1455 case ETH_P_IPX:
1456 if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) {
1457 /* something is wrong with this packet */
1458 do_tx_balance = false;
1459 break;
1460 }
1461
1462 if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) {
1463 /* The only protocol worth balancing in
1464 * this family since it has an "ARP" like
1465 * mechanism
1466 */
1467 do_tx_balance = false;
1468 break;
1469 }
1470
1471 hash_start = (char *)eth_data->h_dest;
1472 hash_size = ETH_ALEN;
1473 break;
1474 case ETH_P_ARP:
1475 do_tx_balance = false;
1476 if (bond_info->rlb_enabled)
1477 tx_slave = rlb_arp_xmit(skb, bond);
1478 break;
1479 default:
1480 do_tx_balance = false;
1481 break;
1482 }
1483
1484 if (do_tx_balance) {
1485 hash_index = _simple_hash(hash_start, hash_size);
1486 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1487 }
1488
1489 return bond_do_alb_xmit(skb, bond, tx_slave);
1490}
1491
1492void bond_alb_monitor(struct work_struct *work)
1493{
1494 struct bonding *bond = container_of(work, struct bonding,
1495 alb_work.work);
1496 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1497 struct list_head *iter;
1498 struct slave *slave;
1499
1500 if (!bond_has_slaves(bond)) {
1501 bond_info->tx_rebalance_counter = 0;
1502 bond_info->lp_counter = 0;
1503 goto re_arm;
1504 }
1505
1506 rcu_read_lock();
1507
1508 bond_info->tx_rebalance_counter++;
1509 bond_info->lp_counter++;
1510
1511 /* send learning packets */
1512 if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) {
1513 bool strict_match;
1514
1515 bond_for_each_slave_rcu(bond, slave, iter) {
1516 /* If updating current_active, use all currently
1517 * user mac addreses (!strict_match). Otherwise, only
1518 * use mac of the slave device.
1519 * In RLB mode, we always use strict matches.
1520 */
1521 strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) ||
1522 bond_info->rlb_enabled);
1523 alb_send_learning_packets(slave, slave->dev->dev_addr,
1524 strict_match);
1525 }
1526 bond_info->lp_counter = 0;
1527 }
1528
1529 /* rebalance tx traffic */
1530 if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
1531 bond_for_each_slave_rcu(bond, slave, iter) {
1532 tlb_clear_slave(bond, slave, 1);
1533 if (slave == rcu_access_pointer(bond->curr_active_slave)) {
1534 SLAVE_TLB_INFO(slave).load =
1535 bond_info->unbalanced_load /
1536 BOND_TLB_REBALANCE_INTERVAL;
1537 bond_info->unbalanced_load = 0;
1538 }
1539 }
1540 bond_info->tx_rebalance_counter = 0;
1541 }
1542
1543 if (bond_info->rlb_enabled) {
1544 if (bond_info->primary_is_promisc &&
1545 (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1546
1547 /* dev_set_promiscuity requires rtnl and
1548 * nothing else. Avoid race with bond_close.
1549 */
1550 rcu_read_unlock();
1551 if (!rtnl_trylock())
1552 goto re_arm;
1553
1554 bond_info->rlb_promisc_timeout_counter = 0;
1555
1556 /* If the primary was set to promiscuous mode
1557 * because a slave was disabled then
1558 * it can now leave promiscuous mode.
1559 */
1560 dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev,
1561 -1);
1562 bond_info->primary_is_promisc = 0;
1563
1564 rtnl_unlock();
1565 rcu_read_lock();
1566 }
1567
1568 if (bond_info->rlb_rebalance) {
1569 bond_info->rlb_rebalance = 0;
1570 rlb_rebalance(bond);
1571 }
1572
1573 /* check if clients need updating */
1574 if (bond_info->rx_ntt) {
1575 if (bond_info->rlb_update_delay_counter) {
1576 --bond_info->rlb_update_delay_counter;
1577 } else {
1578 rlb_update_rx_clients(bond);
1579 if (bond_info->rlb_update_retry_counter)
1580 --bond_info->rlb_update_retry_counter;
1581 else
1582 bond_info->rx_ntt = 0;
1583 }
1584 }
1585 }
1586 rcu_read_unlock();
1587re_arm:
1588 queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
1589}
1590
1591/* assumption: called before the slave is attached to the bond
1592 * and not locked by the bond lock
1593 */
1594int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1595{
1596 int res;
1597
1598 res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr,
1599 slave->dev->addr_len);
1600 if (res)
1601 return res;
1602
1603 res = alb_handle_addr_collision_on_attach(bond, slave);
1604 if (res)
1605 return res;
1606
1607 tlb_init_slave(slave);
1608
1609 /* order a rebalance ASAP */
1610 bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1611
1612 if (bond->alb_info.rlb_enabled)
1613 bond->alb_info.rlb_rebalance = 1;
1614
1615 return 0;
1616}
1617
1618/* Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1619 * if necessary.
1620 *
1621 * Caller must hold RTNL and no other locks
1622 */
1623void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1624{
1625 if (bond_has_slaves(bond))
1626 alb_change_hw_addr_on_detach(bond, slave);
1627
1628 tlb_clear_slave(bond, slave, 0);
1629
1630 if (bond->alb_info.rlb_enabled) {
1631 bond->alb_info.rx_slave = NULL;
1632 rlb_clear_slave(bond, slave);
1633 }
1634
1635}
1636
1637void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1638{
1639 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1640
1641 if (link == BOND_LINK_DOWN) {
1642 tlb_clear_slave(bond, slave, 0);
1643 if (bond->alb_info.rlb_enabled)
1644 rlb_clear_slave(bond, slave);
1645 } else if (link == BOND_LINK_UP) {
1646 /* order a rebalance ASAP */
1647 bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1648 if (bond->alb_info.rlb_enabled) {
1649 bond->alb_info.rlb_rebalance = 1;
1650 /* If the updelay module parameter is smaller than the
1651 * forwarding delay of the switch the rebalance will
1652 * not work because the rebalance arp replies will
1653 * not be forwarded to the clients..
1654 */
1655 }
1656 }
1657
1658 if (bond_is_nondyn_tlb(bond)) {
1659 if (bond_update_slave_arr(bond, NULL))
1660 pr_err("Failed to build slave-array for TLB mode.\n");
1661 }
1662}
1663
1664/**
1665 * bond_alb_handle_active_change - assign new curr_active_slave
1666 * @bond: our bonding struct
1667 * @new_slave: new slave to assign
1668 *
1669 * Set the bond->curr_active_slave to @new_slave and handle
1670 * mac address swapping and promiscuity changes as needed.
1671 *
1672 * Caller must hold RTNL
1673 */
1674void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1675{
1676 struct slave *swap_slave;
1677 struct slave *curr_active;
1678
1679 curr_active = rtnl_dereference(bond->curr_active_slave);
1680 if (curr_active == new_slave)
1681 return;
1682
1683 if (curr_active && bond->alb_info.primary_is_promisc) {
1684 dev_set_promiscuity(curr_active->dev, -1);
1685 bond->alb_info.primary_is_promisc = 0;
1686 bond->alb_info.rlb_promisc_timeout_counter = 0;
1687 }
1688
1689 swap_slave = curr_active;
1690 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1691
1692 if (!new_slave || !bond_has_slaves(bond))
1693 return;
1694
1695 /* set the new curr_active_slave to the bonds mac address
1696 * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1697 */
1698 if (!swap_slave)
1699 swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr);
1700
1701 /* Arrange for swap_slave and new_slave to temporarily be
1702 * ignored so we can mess with their MAC addresses without
1703 * fear of interference from transmit activity.
1704 */
1705 if (swap_slave)
1706 tlb_clear_slave(bond, swap_slave, 1);
1707 tlb_clear_slave(bond, new_slave, 1);
1708
1709 /* in TLB mode, the slave might flip down/up with the old dev_addr,
1710 * and thus filter bond->dev_addr's packets, so force bond's mac
1711 */
1712 if (BOND_MODE(bond) == BOND_MODE_TLB) {
1713 struct sockaddr_storage ss;
1714 u8 tmp_addr[MAX_ADDR_LEN];
1715
1716 bond_hw_addr_copy(tmp_addr, new_slave->dev->dev_addr,
1717 new_slave->dev->addr_len);
1718
1719 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
1720 bond->dev->addr_len);
1721 ss.ss_family = bond->dev->type;
1722 /* we don't care if it can't change its mac, best effort */
1723 dev_set_mac_address(new_slave->dev, (struct sockaddr *)&ss);
1724
1725 bond_hw_addr_copy(new_slave->dev->dev_addr, tmp_addr,
1726 new_slave->dev->addr_len);
1727 }
1728
1729 /* curr_active_slave must be set before calling alb_swap_mac_addr */
1730 if (swap_slave) {
1731 /* swap mac address */
1732 alb_swap_mac_addr(swap_slave, new_slave);
1733 alb_fasten_mac_swap(bond, swap_slave, new_slave);
1734 } else {
1735 /* set the new_slave to the bond mac address */
1736 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr,
1737 bond->dev->addr_len);
1738 alb_send_learning_packets(new_slave, bond->dev->dev_addr,
1739 false);
1740 }
1741}
1742
1743/* Called with RTNL */
1744int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1745{
1746 struct bonding *bond = netdev_priv(bond_dev);
1747 struct sockaddr_storage *ss = addr;
1748 struct slave *curr_active;
1749 struct slave *swap_slave;
1750 int res;
1751
1752 if (!is_valid_ether_addr(ss->__data))
1753 return -EADDRNOTAVAIL;
1754
1755 res = alb_set_mac_address(bond, addr);
1756 if (res)
1757 return res;
1758
1759 bond_hw_addr_copy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
1760
1761 /* If there is no curr_active_slave there is nothing else to do.
1762 * Otherwise we'll need to pass the new address to it and handle
1763 * duplications.
1764 */
1765 curr_active = rtnl_dereference(bond->curr_active_slave);
1766 if (!curr_active)
1767 return 0;
1768
1769 swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr);
1770
1771 if (swap_slave) {
1772 alb_swap_mac_addr(swap_slave, curr_active);
1773 alb_fasten_mac_swap(bond, swap_slave, curr_active);
1774 } else {
1775 alb_set_slave_mac_addr(curr_active, bond_dev->dev_addr,
1776 bond_dev->addr_len);
1777
1778 alb_send_learning_packets(curr_active,
1779 bond_dev->dev_addr, false);
1780 if (bond->alb_info.rlb_enabled) {
1781 /* inform clients mac address has changed */
1782 rlb_req_update_slave_clients(bond, curr_active);
1783 }
1784 }
1785
1786 return 0;
1787}
1788
1789void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1790{
1791 if (bond->alb_info.rlb_enabled)
1792 rlb_clear_vlan(bond, vlan_id);
1793}
1794
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
4 */
5
6#include <linux/skbuff.h>
7#include <linux/netdevice.h>
8#include <linux/etherdevice.h>
9#include <linux/pkt_sched.h>
10#include <linux/spinlock.h>
11#include <linux/slab.h>
12#include <linux/timer.h>
13#include <linux/ip.h>
14#include <linux/ipv6.h>
15#include <linux/if_arp.h>
16#include <linux/if_ether.h>
17#include <linux/if_bonding.h>
18#include <linux/if_vlan.h>
19#include <linux/in.h>
20#include <net/ipx.h>
21#include <net/arp.h>
22#include <net/ipv6.h>
23#include <asm/byteorder.h>
24#include <net/bonding.h>
25#include <net/bond_alb.h>
26
27static const u8 mac_v6_allmcast[ETH_ALEN + 2] __long_aligned = {
28 0x33, 0x33, 0x00, 0x00, 0x00, 0x01
29};
30static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
31
32#pragma pack(1)
33struct learning_pkt {
34 u8 mac_dst[ETH_ALEN];
35 u8 mac_src[ETH_ALEN];
36 __be16 type;
37 u8 padding[ETH_ZLEN - ETH_HLEN];
38};
39
40struct arp_pkt {
41 __be16 hw_addr_space;
42 __be16 prot_addr_space;
43 u8 hw_addr_len;
44 u8 prot_addr_len;
45 __be16 op_code;
46 u8 mac_src[ETH_ALEN]; /* sender hardware address */
47 __be32 ip_src; /* sender IP address */
48 u8 mac_dst[ETH_ALEN]; /* target hardware address */
49 __be32 ip_dst; /* target IP address */
50};
51#pragma pack()
52
53static inline struct arp_pkt *arp_pkt(const struct sk_buff *skb)
54{
55 return (struct arp_pkt *)skb_network_header(skb);
56}
57
58/* Forward declaration */
59static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
60 bool strict_match);
61static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp);
62static void rlb_src_unlink(struct bonding *bond, u32 index);
63static void rlb_src_link(struct bonding *bond, u32 ip_src_hash,
64 u32 ip_dst_hash);
65
66static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
67{
68 int i;
69 u8 hash = 0;
70
71 for (i = 0; i < hash_size; i++)
72 hash ^= hash_start[i];
73
74 return hash;
75}
76
77/*********************** tlb specific functions ***************************/
78
79static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
80{
81 if (save_load) {
82 entry->load_history = 1 + entry->tx_bytes /
83 BOND_TLB_REBALANCE_INTERVAL;
84 entry->tx_bytes = 0;
85 }
86
87 entry->tx_slave = NULL;
88 entry->next = TLB_NULL_INDEX;
89 entry->prev = TLB_NULL_INDEX;
90}
91
92static inline void tlb_init_slave(struct slave *slave)
93{
94 SLAVE_TLB_INFO(slave).load = 0;
95 SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
96}
97
98static void __tlb_clear_slave(struct bonding *bond, struct slave *slave,
99 int save_load)
100{
101 struct tlb_client_info *tx_hash_table;
102 u32 index;
103
104 /* clear slave from tx_hashtbl */
105 tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
106
107 /* skip this if we've already freed the tx hash table */
108 if (tx_hash_table) {
109 index = SLAVE_TLB_INFO(slave).head;
110 while (index != TLB_NULL_INDEX) {
111 u32 next_index = tx_hash_table[index].next;
112 tlb_init_table_entry(&tx_hash_table[index], save_load);
113 index = next_index;
114 }
115 }
116
117 tlb_init_slave(slave);
118}
119
120static void tlb_clear_slave(struct bonding *bond, struct slave *slave,
121 int save_load)
122{
123 spin_lock_bh(&bond->mode_lock);
124 __tlb_clear_slave(bond, slave, save_load);
125 spin_unlock_bh(&bond->mode_lock);
126}
127
128/* Must be called before starting the monitor timer */
129static int tlb_initialize(struct bonding *bond)
130{
131 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
132 int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
133 struct tlb_client_info *new_hashtbl;
134 int i;
135
136 new_hashtbl = kzalloc(size, GFP_KERNEL);
137 if (!new_hashtbl)
138 return -ENOMEM;
139
140 spin_lock_bh(&bond->mode_lock);
141
142 bond_info->tx_hashtbl = new_hashtbl;
143
144 for (i = 0; i < TLB_HASH_TABLE_SIZE; i++)
145 tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0);
146
147 spin_unlock_bh(&bond->mode_lock);
148
149 return 0;
150}
151
152/* Must be called only after all slaves have been released */
153static void tlb_deinitialize(struct bonding *bond)
154{
155 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
156
157 spin_lock_bh(&bond->mode_lock);
158
159 kfree(bond_info->tx_hashtbl);
160 bond_info->tx_hashtbl = NULL;
161
162 spin_unlock_bh(&bond->mode_lock);
163}
164
165static long long compute_gap(struct slave *slave)
166{
167 return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */
168 (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
169}
170
171static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
172{
173 struct slave *slave, *least_loaded;
174 struct list_head *iter;
175 long long max_gap;
176
177 least_loaded = NULL;
178 max_gap = LLONG_MIN;
179
180 /* Find the slave with the largest gap */
181 bond_for_each_slave_rcu(bond, slave, iter) {
182 if (bond_slave_can_tx(slave)) {
183 long long gap = compute_gap(slave);
184
185 if (max_gap < gap) {
186 least_loaded = slave;
187 max_gap = gap;
188 }
189 }
190 }
191
192 return least_loaded;
193}
194
195static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index,
196 u32 skb_len)
197{
198 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
199 struct tlb_client_info *hash_table;
200 struct slave *assigned_slave;
201
202 hash_table = bond_info->tx_hashtbl;
203 assigned_slave = hash_table[hash_index].tx_slave;
204 if (!assigned_slave) {
205 assigned_slave = tlb_get_least_loaded_slave(bond);
206
207 if (assigned_slave) {
208 struct tlb_slave_info *slave_info =
209 &(SLAVE_TLB_INFO(assigned_slave));
210 u32 next_index = slave_info->head;
211
212 hash_table[hash_index].tx_slave = assigned_slave;
213 hash_table[hash_index].next = next_index;
214 hash_table[hash_index].prev = TLB_NULL_INDEX;
215
216 if (next_index != TLB_NULL_INDEX)
217 hash_table[next_index].prev = hash_index;
218
219 slave_info->head = hash_index;
220 slave_info->load +=
221 hash_table[hash_index].load_history;
222 }
223 }
224
225 if (assigned_slave)
226 hash_table[hash_index].tx_bytes += skb_len;
227
228 return assigned_slave;
229}
230
231static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index,
232 u32 skb_len)
233{
234 struct slave *tx_slave;
235
236 /* We don't need to disable softirq here, becase
237 * tlb_choose_channel() is only called by bond_alb_xmit()
238 * which already has softirq disabled.
239 */
240 spin_lock(&bond->mode_lock);
241 tx_slave = __tlb_choose_channel(bond, hash_index, skb_len);
242 spin_unlock(&bond->mode_lock);
243
244 return tx_slave;
245}
246
247/*********************** rlb specific functions ***************************/
248
249/* when an ARP REPLY is received from a client update its info
250 * in the rx_hashtbl
251 */
252static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
253{
254 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
255 struct rlb_client_info *client_info;
256 u32 hash_index;
257
258 spin_lock_bh(&bond->mode_lock);
259
260 hash_index = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
261 client_info = &(bond_info->rx_hashtbl[hash_index]);
262
263 if ((client_info->assigned) &&
264 (client_info->ip_src == arp->ip_dst) &&
265 (client_info->ip_dst == arp->ip_src) &&
266 (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) {
267 /* update the clients MAC address */
268 ether_addr_copy(client_info->mac_dst, arp->mac_src);
269 client_info->ntt = 1;
270 bond_info->rx_ntt = 1;
271 }
272
273 spin_unlock_bh(&bond->mode_lock);
274}
275
276static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond,
277 struct slave *slave)
278{
279 struct arp_pkt *arp, _arp;
280
281 if (skb->protocol != cpu_to_be16(ETH_P_ARP))
282 goto out;
283
284 arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp);
285 if (!arp)
286 goto out;
287
288 /* We received an ARP from arp->ip_src.
289 * We might have used this IP address previously (on the bonding host
290 * itself or on a system that is bridged together with the bond).
291 * However, if arp->mac_src is different than what is stored in
292 * rx_hashtbl, some other host is now using the IP and we must prevent
293 * sending out client updates with this IP address and the old MAC
294 * address.
295 * Clean up all hash table entries that have this address as ip_src but
296 * have a different mac_src.
297 */
298 rlb_purge_src_ip(bond, arp);
299
300 if (arp->op_code == htons(ARPOP_REPLY)) {
301 /* update rx hash table for this ARP */
302 rlb_update_entry_from_arp(bond, arp);
303 slave_dbg(bond->dev, slave->dev, "Server received an ARP Reply from client\n");
304 }
305out:
306 return RX_HANDLER_ANOTHER;
307}
308
309/* Caller must hold rcu_read_lock() */
310static struct slave *__rlb_next_rx_slave(struct bonding *bond)
311{
312 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
313 struct slave *before = NULL, *rx_slave = NULL, *slave;
314 struct list_head *iter;
315 bool found = false;
316
317 bond_for_each_slave_rcu(bond, slave, iter) {
318 if (!bond_slave_can_tx(slave))
319 continue;
320 if (!found) {
321 if (!before || before->speed < slave->speed)
322 before = slave;
323 } else {
324 if (!rx_slave || rx_slave->speed < slave->speed)
325 rx_slave = slave;
326 }
327 if (slave == bond_info->rx_slave)
328 found = true;
329 }
330 /* we didn't find anything after the current or we have something
331 * better before and up to the current slave
332 */
333 if (!rx_slave || (before && rx_slave->speed < before->speed))
334 rx_slave = before;
335
336 if (rx_slave)
337 bond_info->rx_slave = rx_slave;
338
339 return rx_slave;
340}
341
342/* Caller must hold RTNL, rcu_read_lock is obtained only to silence checkers */
343static struct slave *rlb_next_rx_slave(struct bonding *bond)
344{
345 struct slave *rx_slave;
346
347 ASSERT_RTNL();
348
349 rcu_read_lock();
350 rx_slave = __rlb_next_rx_slave(bond);
351 rcu_read_unlock();
352
353 return rx_slave;
354}
355
356/* teach the switch the mac of a disabled slave
357 * on the primary for fault tolerance
358 *
359 * Caller must hold RTNL
360 */
361static void rlb_teach_disabled_mac_on_primary(struct bonding *bond, u8 addr[])
362{
363 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
364
365 if (!curr_active)
366 return;
367
368 if (!bond->alb_info.primary_is_promisc) {
369 if (!dev_set_promiscuity(curr_active->dev, 1))
370 bond->alb_info.primary_is_promisc = 1;
371 else
372 bond->alb_info.primary_is_promisc = 0;
373 }
374
375 bond->alb_info.rlb_promisc_timeout_counter = 0;
376
377 alb_send_learning_packets(curr_active, addr, true);
378}
379
380/* slave being removed should not be active at this point
381 *
382 * Caller must hold rtnl.
383 */
384static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
385{
386 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
387 struct rlb_client_info *rx_hash_table;
388 u32 index, next_index;
389
390 /* clear slave from rx_hashtbl */
391 spin_lock_bh(&bond->mode_lock);
392
393 rx_hash_table = bond_info->rx_hashtbl;
394 index = bond_info->rx_hashtbl_used_head;
395 for (; index != RLB_NULL_INDEX; index = next_index) {
396 next_index = rx_hash_table[index].used_next;
397 if (rx_hash_table[index].slave == slave) {
398 struct slave *assigned_slave = rlb_next_rx_slave(bond);
399
400 if (assigned_slave) {
401 rx_hash_table[index].slave = assigned_slave;
402 if (is_valid_ether_addr(rx_hash_table[index].mac_dst)) {
403 bond_info->rx_hashtbl[index].ntt = 1;
404 bond_info->rx_ntt = 1;
405 /* A slave has been removed from the
406 * table because it is either disabled
407 * or being released. We must retry the
408 * update to avoid clients from not
409 * being updated & disconnecting when
410 * there is stress
411 */
412 bond_info->rlb_update_retry_counter =
413 RLB_UPDATE_RETRY;
414 }
415 } else { /* there is no active slave */
416 rx_hash_table[index].slave = NULL;
417 }
418 }
419 }
420
421 spin_unlock_bh(&bond->mode_lock);
422
423 if (slave != rtnl_dereference(bond->curr_active_slave))
424 rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
425}
426
427static void rlb_update_client(struct rlb_client_info *client_info)
428{
429 int i;
430
431 if (!client_info->slave || !is_valid_ether_addr(client_info->mac_dst))
432 return;
433
434 for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
435 struct sk_buff *skb;
436
437 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
438 client_info->ip_dst,
439 client_info->slave->dev,
440 client_info->ip_src,
441 client_info->mac_dst,
442 client_info->slave->dev->dev_addr,
443 client_info->mac_dst);
444 if (!skb) {
445 slave_err(client_info->slave->bond->dev,
446 client_info->slave->dev,
447 "failed to create an ARP packet\n");
448 continue;
449 }
450
451 skb->dev = client_info->slave->dev;
452
453 if (client_info->vlan_id) {
454 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
455 client_info->vlan_id);
456 }
457
458 arp_xmit(skb);
459 }
460}
461
462/* sends ARP REPLIES that update the clients that need updating */
463static void rlb_update_rx_clients(struct bonding *bond)
464{
465 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
466 struct rlb_client_info *client_info;
467 u32 hash_index;
468
469 spin_lock_bh(&bond->mode_lock);
470
471 hash_index = bond_info->rx_hashtbl_used_head;
472 for (; hash_index != RLB_NULL_INDEX;
473 hash_index = client_info->used_next) {
474 client_info = &(bond_info->rx_hashtbl[hash_index]);
475 if (client_info->ntt) {
476 rlb_update_client(client_info);
477 if (bond_info->rlb_update_retry_counter == 0)
478 client_info->ntt = 0;
479 }
480 }
481
482 /* do not update the entries again until this counter is zero so that
483 * not to confuse the clients.
484 */
485 bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
486
487 spin_unlock_bh(&bond->mode_lock);
488}
489
490/* The slave was assigned a new mac address - update the clients */
491static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
492{
493 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
494 struct rlb_client_info *client_info;
495 int ntt = 0;
496 u32 hash_index;
497
498 spin_lock_bh(&bond->mode_lock);
499
500 hash_index = bond_info->rx_hashtbl_used_head;
501 for (; hash_index != RLB_NULL_INDEX;
502 hash_index = client_info->used_next) {
503 client_info = &(bond_info->rx_hashtbl[hash_index]);
504
505 if ((client_info->slave == slave) &&
506 is_valid_ether_addr(client_info->mac_dst)) {
507 client_info->ntt = 1;
508 ntt = 1;
509 }
510 }
511
512 /* update the team's flag only after the whole iteration */
513 if (ntt) {
514 bond_info->rx_ntt = 1;
515 /* fasten the change */
516 bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
517 }
518
519 spin_unlock_bh(&bond->mode_lock);
520}
521
522/* mark all clients using src_ip to be updated */
523static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
524{
525 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
526 struct rlb_client_info *client_info;
527 u32 hash_index;
528
529 spin_lock(&bond->mode_lock);
530
531 hash_index = bond_info->rx_hashtbl_used_head;
532 for (; hash_index != RLB_NULL_INDEX;
533 hash_index = client_info->used_next) {
534 client_info = &(bond_info->rx_hashtbl[hash_index]);
535
536 if (!client_info->slave) {
537 netdev_err(bond->dev, "found a client with no channel in the client's hash table\n");
538 continue;
539 }
540 /* update all clients using this src_ip, that are not assigned
541 * to the team's address (curr_active_slave) and have a known
542 * unicast mac address.
543 */
544 if ((client_info->ip_src == src_ip) &&
545 !ether_addr_equal_64bits(client_info->slave->dev->dev_addr,
546 bond->dev->dev_addr) &&
547 is_valid_ether_addr(client_info->mac_dst)) {
548 client_info->ntt = 1;
549 bond_info->rx_ntt = 1;
550 }
551 }
552
553 spin_unlock(&bond->mode_lock);
554}
555
556static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bond)
557{
558 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
559 struct arp_pkt *arp = arp_pkt(skb);
560 struct slave *assigned_slave, *curr_active_slave;
561 struct rlb_client_info *client_info;
562 u32 hash_index = 0;
563
564 spin_lock(&bond->mode_lock);
565
566 curr_active_slave = rcu_dereference(bond->curr_active_slave);
567
568 hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst));
569 client_info = &(bond_info->rx_hashtbl[hash_index]);
570
571 if (client_info->assigned) {
572 if ((client_info->ip_src == arp->ip_src) &&
573 (client_info->ip_dst == arp->ip_dst)) {
574 /* the entry is already assigned to this client */
575 if (!is_broadcast_ether_addr(arp->mac_dst)) {
576 /* update mac address from arp */
577 ether_addr_copy(client_info->mac_dst, arp->mac_dst);
578 }
579 ether_addr_copy(client_info->mac_src, arp->mac_src);
580
581 assigned_slave = client_info->slave;
582 if (assigned_slave) {
583 spin_unlock(&bond->mode_lock);
584 return assigned_slave;
585 }
586 } else {
587 /* the entry is already assigned to some other client,
588 * move the old client to primary (curr_active_slave) so
589 * that the new client can be assigned to this entry.
590 */
591 if (curr_active_slave &&
592 client_info->slave != curr_active_slave) {
593 client_info->slave = curr_active_slave;
594 rlb_update_client(client_info);
595 }
596 }
597 }
598 /* assign a new slave */
599 assigned_slave = __rlb_next_rx_slave(bond);
600
601 if (assigned_slave) {
602 if (!(client_info->assigned &&
603 client_info->ip_src == arp->ip_src)) {
604 /* ip_src is going to be updated,
605 * fix the src hash list
606 */
607 u32 hash_src = _simple_hash((u8 *)&arp->ip_src,
608 sizeof(arp->ip_src));
609 rlb_src_unlink(bond, hash_index);
610 rlb_src_link(bond, hash_src, hash_index);
611 }
612
613 client_info->ip_src = arp->ip_src;
614 client_info->ip_dst = arp->ip_dst;
615 /* arp->mac_dst is broadcast for arp reqeusts.
616 * will be updated with clients actual unicast mac address
617 * upon receiving an arp reply.
618 */
619 ether_addr_copy(client_info->mac_dst, arp->mac_dst);
620 ether_addr_copy(client_info->mac_src, arp->mac_src);
621 client_info->slave = assigned_slave;
622
623 if (is_valid_ether_addr(client_info->mac_dst)) {
624 client_info->ntt = 1;
625 bond->alb_info.rx_ntt = 1;
626 } else {
627 client_info->ntt = 0;
628 }
629
630 if (vlan_get_tag(skb, &client_info->vlan_id))
631 client_info->vlan_id = 0;
632
633 if (!client_info->assigned) {
634 u32 prev_tbl_head = bond_info->rx_hashtbl_used_head;
635 bond_info->rx_hashtbl_used_head = hash_index;
636 client_info->used_next = prev_tbl_head;
637 if (prev_tbl_head != RLB_NULL_INDEX) {
638 bond_info->rx_hashtbl[prev_tbl_head].used_prev =
639 hash_index;
640 }
641 client_info->assigned = 1;
642 }
643 }
644
645 spin_unlock(&bond->mode_lock);
646
647 return assigned_slave;
648}
649
650/* chooses (and returns) transmit channel for arp reply
651 * does not choose channel for other arp types since they are
652 * sent on the curr_active_slave
653 */
654static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
655{
656 struct arp_pkt *arp = arp_pkt(skb);
657 struct slave *tx_slave = NULL;
658
659 /* Don't modify or load balance ARPs that do not originate locally
660 * (e.g.,arrive via a bridge).
661 */
662 if (!bond_slave_has_mac_rx(bond, arp->mac_src))
663 return NULL;
664
665 if (arp->op_code == htons(ARPOP_REPLY)) {
666 /* the arp must be sent on the selected rx channel */
667 tx_slave = rlb_choose_channel(skb, bond);
668 if (tx_slave)
669 bond_hw_addr_copy(arp->mac_src, tx_slave->dev->dev_addr,
670 tx_slave->dev->addr_len);
671 netdev_dbg(bond->dev, "(slave %s): Server sent ARP Reply packet\n",
672 tx_slave ? tx_slave->dev->name : "NULL");
673 } else if (arp->op_code == htons(ARPOP_REQUEST)) {
674 /* Create an entry in the rx_hashtbl for this client as a
675 * place holder.
676 * When the arp reply is received the entry will be updated
677 * with the correct unicast address of the client.
678 */
679 tx_slave = rlb_choose_channel(skb, bond);
680
681 /* The ARP reply packets must be delayed so that
682 * they can cancel out the influence of the ARP request.
683 */
684 bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
685
686 /* arp requests are broadcast and are sent on the primary
687 * the arp request will collapse all clients on the subnet to
688 * the primary slave. We must register these clients to be
689 * updated with their assigned mac.
690 */
691 rlb_req_update_subnet_clients(bond, arp->ip_src);
692 netdev_dbg(bond->dev, "(slave %s): Server sent ARP Request packet\n",
693 tx_slave ? tx_slave->dev->name : "NULL");
694 }
695
696 return tx_slave;
697}
698
699static void rlb_rebalance(struct bonding *bond)
700{
701 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
702 struct slave *assigned_slave;
703 struct rlb_client_info *client_info;
704 int ntt;
705 u32 hash_index;
706
707 spin_lock_bh(&bond->mode_lock);
708
709 ntt = 0;
710 hash_index = bond_info->rx_hashtbl_used_head;
711 for (; hash_index != RLB_NULL_INDEX;
712 hash_index = client_info->used_next) {
713 client_info = &(bond_info->rx_hashtbl[hash_index]);
714 assigned_slave = __rlb_next_rx_slave(bond);
715 if (assigned_slave && (client_info->slave != assigned_slave)) {
716 client_info->slave = assigned_slave;
717 if (!is_zero_ether_addr(client_info->mac_dst)) {
718 client_info->ntt = 1;
719 ntt = 1;
720 }
721 }
722 }
723
724 /* update the team's flag only after the whole iteration */
725 if (ntt)
726 bond_info->rx_ntt = 1;
727 spin_unlock_bh(&bond->mode_lock);
728}
729
730/* Caller must hold mode_lock */
731static void rlb_init_table_entry_dst(struct rlb_client_info *entry)
732{
733 entry->used_next = RLB_NULL_INDEX;
734 entry->used_prev = RLB_NULL_INDEX;
735 entry->assigned = 0;
736 entry->slave = NULL;
737 entry->vlan_id = 0;
738}
739static void rlb_init_table_entry_src(struct rlb_client_info *entry)
740{
741 entry->src_first = RLB_NULL_INDEX;
742 entry->src_prev = RLB_NULL_INDEX;
743 entry->src_next = RLB_NULL_INDEX;
744}
745
746static void rlb_init_table_entry(struct rlb_client_info *entry)
747{
748 memset(entry, 0, sizeof(struct rlb_client_info));
749 rlb_init_table_entry_dst(entry);
750 rlb_init_table_entry_src(entry);
751}
752
753static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index)
754{
755 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
756 u32 next_index = bond_info->rx_hashtbl[index].used_next;
757 u32 prev_index = bond_info->rx_hashtbl[index].used_prev;
758
759 if (index == bond_info->rx_hashtbl_used_head)
760 bond_info->rx_hashtbl_used_head = next_index;
761 if (prev_index != RLB_NULL_INDEX)
762 bond_info->rx_hashtbl[prev_index].used_next = next_index;
763 if (next_index != RLB_NULL_INDEX)
764 bond_info->rx_hashtbl[next_index].used_prev = prev_index;
765}
766
767/* unlink a rlb hash table entry from the src list */
768static void rlb_src_unlink(struct bonding *bond, u32 index)
769{
770 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
771 u32 next_index = bond_info->rx_hashtbl[index].src_next;
772 u32 prev_index = bond_info->rx_hashtbl[index].src_prev;
773
774 bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX;
775 bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX;
776
777 if (next_index != RLB_NULL_INDEX)
778 bond_info->rx_hashtbl[next_index].src_prev = prev_index;
779
780 if (prev_index == RLB_NULL_INDEX)
781 return;
782
783 /* is prev_index pointing to the head of this list? */
784 if (bond_info->rx_hashtbl[prev_index].src_first == index)
785 bond_info->rx_hashtbl[prev_index].src_first = next_index;
786 else
787 bond_info->rx_hashtbl[prev_index].src_next = next_index;
788
789}
790
791static void rlb_delete_table_entry(struct bonding *bond, u32 index)
792{
793 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
794 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
795
796 rlb_delete_table_entry_dst(bond, index);
797 rlb_init_table_entry_dst(entry);
798
799 rlb_src_unlink(bond, index);
800}
801
802/* add the rx_hashtbl[ip_dst_hash] entry to the list
803 * of entries with identical ip_src_hash
804 */
805static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash)
806{
807 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
808 u32 next;
809
810 bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash;
811 next = bond_info->rx_hashtbl[ip_src_hash].src_first;
812 bond_info->rx_hashtbl[ip_dst_hash].src_next = next;
813 if (next != RLB_NULL_INDEX)
814 bond_info->rx_hashtbl[next].src_prev = ip_dst_hash;
815 bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash;
816}
817
818/* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does
819 * not match arp->mac_src
820 */
821static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp)
822{
823 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
824 u32 ip_src_hash = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
825 u32 index;
826
827 spin_lock_bh(&bond->mode_lock);
828
829 index = bond_info->rx_hashtbl[ip_src_hash].src_first;
830 while (index != RLB_NULL_INDEX) {
831 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
832 u32 next_index = entry->src_next;
833 if (entry->ip_src == arp->ip_src &&
834 !ether_addr_equal_64bits(arp->mac_src, entry->mac_src))
835 rlb_delete_table_entry(bond, index);
836 index = next_index;
837 }
838 spin_unlock_bh(&bond->mode_lock);
839}
840
841static int rlb_initialize(struct bonding *bond)
842{
843 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
844 struct rlb_client_info *new_hashtbl;
845 int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
846 int i;
847
848 new_hashtbl = kmalloc(size, GFP_KERNEL);
849 if (!new_hashtbl)
850 return -1;
851
852 spin_lock_bh(&bond->mode_lock);
853
854 bond_info->rx_hashtbl = new_hashtbl;
855
856 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
857
858 for (i = 0; i < RLB_HASH_TABLE_SIZE; i++)
859 rlb_init_table_entry(bond_info->rx_hashtbl + i);
860
861 spin_unlock_bh(&bond->mode_lock);
862
863 /* register to receive ARPs */
864 bond->recv_probe = rlb_arp_recv;
865
866 return 0;
867}
868
869static void rlb_deinitialize(struct bonding *bond)
870{
871 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
872
873 spin_lock_bh(&bond->mode_lock);
874
875 kfree(bond_info->rx_hashtbl);
876 bond_info->rx_hashtbl = NULL;
877 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
878
879 spin_unlock_bh(&bond->mode_lock);
880}
881
882static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
883{
884 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
885 u32 curr_index;
886
887 spin_lock_bh(&bond->mode_lock);
888
889 curr_index = bond_info->rx_hashtbl_used_head;
890 while (curr_index != RLB_NULL_INDEX) {
891 struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
892 u32 next_index = bond_info->rx_hashtbl[curr_index].used_next;
893
894 if (curr->vlan_id == vlan_id)
895 rlb_delete_table_entry(bond, curr_index);
896
897 curr_index = next_index;
898 }
899
900 spin_unlock_bh(&bond->mode_lock);
901}
902
903/*********************** tlb/rlb shared functions *********************/
904
905static void alb_send_lp_vid(struct slave *slave, u8 mac_addr[],
906 __be16 vlan_proto, u16 vid)
907{
908 struct learning_pkt pkt;
909 struct sk_buff *skb;
910 int size = sizeof(struct learning_pkt);
911
912 memset(&pkt, 0, size);
913 ether_addr_copy(pkt.mac_dst, mac_addr);
914 ether_addr_copy(pkt.mac_src, mac_addr);
915 pkt.type = cpu_to_be16(ETH_P_LOOPBACK);
916
917 skb = dev_alloc_skb(size);
918 if (!skb)
919 return;
920
921 skb_put_data(skb, &pkt, size);
922
923 skb_reset_mac_header(skb);
924 skb->network_header = skb->mac_header + ETH_HLEN;
925 skb->protocol = pkt.type;
926 skb->priority = TC_PRIO_CONTROL;
927 skb->dev = slave->dev;
928
929 slave_dbg(slave->bond->dev, slave->dev,
930 "Send learning packet: mac %pM vlan %d\n", mac_addr, vid);
931
932 if (vid)
933 __vlan_hwaccel_put_tag(skb, vlan_proto, vid);
934
935 dev_queue_xmit(skb);
936}
937
938struct alb_walk_data {
939 struct bonding *bond;
940 struct slave *slave;
941 u8 *mac_addr;
942 bool strict_match;
943};
944
945static int alb_upper_dev_walk(struct net_device *upper, void *_data)
946{
947 struct alb_walk_data *data = _data;
948 bool strict_match = data->strict_match;
949 struct bonding *bond = data->bond;
950 struct slave *slave = data->slave;
951 u8 *mac_addr = data->mac_addr;
952 struct bond_vlan_tag *tags;
953
954 if (is_vlan_dev(upper) &&
955 bond->dev->lower_level == upper->lower_level - 1) {
956 if (upper->addr_assign_type == NET_ADDR_STOLEN) {
957 alb_send_lp_vid(slave, mac_addr,
958 vlan_dev_vlan_proto(upper),
959 vlan_dev_vlan_id(upper));
960 } else {
961 alb_send_lp_vid(slave, upper->dev_addr,
962 vlan_dev_vlan_proto(upper),
963 vlan_dev_vlan_id(upper));
964 }
965 }
966
967 /* If this is a macvlan device, then only send updates
968 * when strict_match is turned off.
969 */
970 if (netif_is_macvlan(upper) && !strict_match) {
971 tags = bond_verify_device_path(bond->dev, upper, 0);
972 if (IS_ERR_OR_NULL(tags))
973 BUG();
974 alb_send_lp_vid(slave, upper->dev_addr,
975 tags[0].vlan_proto, tags[0].vlan_id);
976 kfree(tags);
977 }
978
979 return 0;
980}
981
982static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[],
983 bool strict_match)
984{
985 struct bonding *bond = bond_get_bond_by_slave(slave);
986 struct alb_walk_data data = {
987 .strict_match = strict_match,
988 .mac_addr = mac_addr,
989 .slave = slave,
990 .bond = bond,
991 };
992
993 /* send untagged */
994 alb_send_lp_vid(slave, mac_addr, 0, 0);
995
996 /* loop through all devices and see if we need to send a packet
997 * for that device.
998 */
999 rcu_read_lock();
1000 netdev_walk_all_upper_dev_rcu(bond->dev, alb_upper_dev_walk, &data);
1001 rcu_read_unlock();
1002}
1003
1004static int alb_set_slave_mac_addr(struct slave *slave, u8 addr[],
1005 unsigned int len)
1006{
1007 struct net_device *dev = slave->dev;
1008 struct sockaddr_storage ss;
1009
1010 if (BOND_MODE(slave->bond) == BOND_MODE_TLB) {
1011 memcpy(dev->dev_addr, addr, len);
1012 return 0;
1013 }
1014
1015 /* for rlb each slave must have a unique hw mac addresses so that
1016 * each slave will receive packets destined to a different mac
1017 */
1018 memcpy(ss.__data, addr, len);
1019 ss.ss_family = dev->type;
1020 if (dev_set_mac_address(dev, (struct sockaddr *)&ss, NULL)) {
1021 slave_err(slave->bond->dev, dev, "dev_set_mac_address on slave failed! ALB mode requires that the base driver support setting the hw address also when the network device's interface is open\n");
1022 return -EOPNOTSUPP;
1023 }
1024 return 0;
1025}
1026
1027/* Swap MAC addresses between two slaves.
1028 *
1029 * Called with RTNL held, and no other locks.
1030 */
1031static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2)
1032{
1033 u8 tmp_mac_addr[MAX_ADDR_LEN];
1034
1035 bond_hw_addr_copy(tmp_mac_addr, slave1->dev->dev_addr,
1036 slave1->dev->addr_len);
1037 alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr,
1038 slave2->dev->addr_len);
1039 alb_set_slave_mac_addr(slave2, tmp_mac_addr,
1040 slave1->dev->addr_len);
1041
1042}
1043
1044/* Send learning packets after MAC address swap.
1045 *
1046 * Called with RTNL and no other locks
1047 */
1048static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
1049 struct slave *slave2)
1050{
1051 int slaves_state_differ = (bond_slave_can_tx(slave1) != bond_slave_can_tx(slave2));
1052 struct slave *disabled_slave = NULL;
1053
1054 ASSERT_RTNL();
1055
1056 /* fasten the change in the switch */
1057 if (bond_slave_can_tx(slave1)) {
1058 alb_send_learning_packets(slave1, slave1->dev->dev_addr, false);
1059 if (bond->alb_info.rlb_enabled) {
1060 /* inform the clients that the mac address
1061 * has changed
1062 */
1063 rlb_req_update_slave_clients(bond, slave1);
1064 }
1065 } else {
1066 disabled_slave = slave1;
1067 }
1068
1069 if (bond_slave_can_tx(slave2)) {
1070 alb_send_learning_packets(slave2, slave2->dev->dev_addr, false);
1071 if (bond->alb_info.rlb_enabled) {
1072 /* inform the clients that the mac address
1073 * has changed
1074 */
1075 rlb_req_update_slave_clients(bond, slave2);
1076 }
1077 } else {
1078 disabled_slave = slave2;
1079 }
1080
1081 if (bond->alb_info.rlb_enabled && slaves_state_differ) {
1082 /* A disabled slave was assigned an active mac addr */
1083 rlb_teach_disabled_mac_on_primary(bond,
1084 disabled_slave->dev->dev_addr);
1085 }
1086}
1087
1088/**
1089 * alb_change_hw_addr_on_detach
1090 * @bond: bonding we're working on
1091 * @slave: the slave that was just detached
1092 *
1093 * We assume that @slave was already detached from the slave list.
1094 *
1095 * If @slave's permanent hw address is different both from its current
1096 * address and from @bond's address, then somewhere in the bond there's
1097 * a slave that has @slave's permanet address as its current address.
1098 * We'll make sure that that slave no longer uses @slave's permanent address.
1099 *
1100 * Caller must hold RTNL and no other locks
1101 */
1102static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1103{
1104 int perm_curr_diff;
1105 int perm_bond_diff;
1106 struct slave *found_slave;
1107
1108 perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1109 slave->dev->dev_addr);
1110 perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1111 bond->dev->dev_addr);
1112
1113 if (perm_curr_diff && perm_bond_diff) {
1114 found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr);
1115
1116 if (found_slave) {
1117 alb_swap_mac_addr(slave, found_slave);
1118 alb_fasten_mac_swap(bond, slave, found_slave);
1119 }
1120 }
1121}
1122
1123/**
1124 * alb_handle_addr_collision_on_attach
1125 * @bond: bonding we're working on
1126 * @slave: the slave that was just attached
1127 *
1128 * checks uniqueness of slave's mac address and handles the case the
1129 * new slave uses the bonds mac address.
1130 *
1131 * If the permanent hw address of @slave is @bond's hw address, we need to
1132 * find a different hw address to give @slave, that isn't in use by any other
1133 * slave in the bond. This address must be, of course, one of the permanent
1134 * addresses of the other slaves.
1135 *
1136 * We go over the slave list, and for each slave there we compare its
1137 * permanent hw address with the current address of all the other slaves.
1138 * If no match was found, then we've found a slave with a permanent address
1139 * that isn't used by any other slave in the bond, so we can assign it to
1140 * @slave.
1141 *
1142 * assumption: this function is called before @slave is attached to the
1143 * bond slave list.
1144 */
1145static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1146{
1147 struct slave *has_bond_addr = rcu_access_pointer(bond->curr_active_slave);
1148 struct slave *tmp_slave1, *free_mac_slave = NULL;
1149 struct list_head *iter;
1150
1151 if (!bond_has_slaves(bond)) {
1152 /* this is the first slave */
1153 return 0;
1154 }
1155
1156 /* if slave's mac address differs from bond's mac address
1157 * check uniqueness of slave's mac address against the other
1158 * slaves in the bond.
1159 */
1160 if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
1161 if (!bond_slave_has_mac(bond, slave->dev->dev_addr))
1162 return 0;
1163
1164 /* Try setting slave mac to bond address and fall-through
1165 * to code handling that situation below...
1166 */
1167 alb_set_slave_mac_addr(slave, bond->dev->dev_addr,
1168 bond->dev->addr_len);
1169 }
1170
1171 /* The slave's address is equal to the address of the bond.
1172 * Search for a spare address in the bond for this slave.
1173 */
1174 bond_for_each_slave(bond, tmp_slave1, iter) {
1175 if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) {
1176 /* no slave has tmp_slave1's perm addr
1177 * as its curr addr
1178 */
1179 free_mac_slave = tmp_slave1;
1180 break;
1181 }
1182
1183 if (!has_bond_addr) {
1184 if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr,
1185 bond->dev->dev_addr)) {
1186
1187 has_bond_addr = tmp_slave1;
1188 }
1189 }
1190 }
1191
1192 if (free_mac_slave) {
1193 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr,
1194 free_mac_slave->dev->addr_len);
1195
1196 slave_warn(bond->dev, slave->dev, "the slave hw address is in use by the bond; giving it the hw address of %s\n",
1197 free_mac_slave->dev->name);
1198
1199 } else if (has_bond_addr) {
1200 slave_err(bond->dev, slave->dev, "the slave hw address is in use by the bond; couldn't find a slave with a free hw address to give it (this should not have happened)\n");
1201 return -EFAULT;
1202 }
1203
1204 return 0;
1205}
1206
1207/**
1208 * alb_set_mac_address
1209 * @bond:
1210 * @addr:
1211 *
1212 * In TLB mode all slaves are configured to the bond's hw address, but set
1213 * their dev_addr field to different addresses (based on their permanent hw
1214 * addresses).
1215 *
1216 * For each slave, this function sets the interface to the new address and then
1217 * changes its dev_addr field to its previous value.
1218 *
1219 * Unwinding assumes bond's mac address has not yet changed.
1220 */
1221static int alb_set_mac_address(struct bonding *bond, void *addr)
1222{
1223 struct slave *slave, *rollback_slave;
1224 struct list_head *iter;
1225 struct sockaddr_storage ss;
1226 char tmp_addr[MAX_ADDR_LEN];
1227 int res;
1228
1229 if (bond->alb_info.rlb_enabled)
1230 return 0;
1231
1232 bond_for_each_slave(bond, slave, iter) {
1233 /* save net_device's current hw address */
1234 bond_hw_addr_copy(tmp_addr, slave->dev->dev_addr,
1235 slave->dev->addr_len);
1236
1237 res = dev_set_mac_address(slave->dev, addr, NULL);
1238
1239 /* restore net_device's hw address */
1240 bond_hw_addr_copy(slave->dev->dev_addr, tmp_addr,
1241 slave->dev->addr_len);
1242
1243 if (res)
1244 goto unwind;
1245 }
1246
1247 return 0;
1248
1249unwind:
1250 memcpy(ss.__data, bond->dev->dev_addr, bond->dev->addr_len);
1251 ss.ss_family = bond->dev->type;
1252
1253 /* unwind from head to the slave that failed */
1254 bond_for_each_slave(bond, rollback_slave, iter) {
1255 if (rollback_slave == slave)
1256 break;
1257 bond_hw_addr_copy(tmp_addr, rollback_slave->dev->dev_addr,
1258 rollback_slave->dev->addr_len);
1259 dev_set_mac_address(rollback_slave->dev,
1260 (struct sockaddr *)&ss, NULL);
1261 bond_hw_addr_copy(rollback_slave->dev->dev_addr, tmp_addr,
1262 rollback_slave->dev->addr_len);
1263 }
1264
1265 return res;
1266}
1267
1268/************************ exported alb funcions ************************/
1269
1270int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1271{
1272 int res;
1273
1274 res = tlb_initialize(bond);
1275 if (res)
1276 return res;
1277
1278 if (rlb_enabled) {
1279 bond->alb_info.rlb_enabled = 1;
1280 res = rlb_initialize(bond);
1281 if (res) {
1282 tlb_deinitialize(bond);
1283 return res;
1284 }
1285 } else {
1286 bond->alb_info.rlb_enabled = 0;
1287 }
1288
1289 return 0;
1290}
1291
1292void bond_alb_deinitialize(struct bonding *bond)
1293{
1294 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1295
1296 tlb_deinitialize(bond);
1297
1298 if (bond_info->rlb_enabled)
1299 rlb_deinitialize(bond);
1300}
1301
1302static netdev_tx_t bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond,
1303 struct slave *tx_slave)
1304{
1305 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1306 struct ethhdr *eth_data = eth_hdr(skb);
1307
1308 if (!tx_slave) {
1309 /* unbalanced or unassigned, send through primary */
1310 tx_slave = rcu_dereference(bond->curr_active_slave);
1311 if (bond->params.tlb_dynamic_lb)
1312 bond_info->unbalanced_load += skb->len;
1313 }
1314
1315 if (tx_slave && bond_slave_can_tx(tx_slave)) {
1316 if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) {
1317 ether_addr_copy(eth_data->h_source,
1318 tx_slave->dev->dev_addr);
1319 }
1320
1321 bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1322 goto out;
1323 }
1324
1325 if (tx_slave && bond->params.tlb_dynamic_lb) {
1326 spin_lock(&bond->mode_lock);
1327 __tlb_clear_slave(bond, tx_slave, 0);
1328 spin_unlock(&bond->mode_lock);
1329 }
1330
1331 /* no suitable interface, frame not sent */
1332 bond_tx_drop(bond->dev, skb);
1333out:
1334 return NETDEV_TX_OK;
1335}
1336
1337netdev_tx_t bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1338{
1339 struct bonding *bond = netdev_priv(bond_dev);
1340 struct ethhdr *eth_data;
1341 struct slave *tx_slave = NULL;
1342 u32 hash_index;
1343
1344 skb_reset_mac_header(skb);
1345 eth_data = eth_hdr(skb);
1346
1347 /* Do not TX balance any multicast or broadcast */
1348 if (!is_multicast_ether_addr(eth_data->h_dest)) {
1349 switch (skb->protocol) {
1350 case htons(ETH_P_IP):
1351 case htons(ETH_P_IPX):
1352 /* In case of IPX, it will falback to L2 hash */
1353 case htons(ETH_P_IPV6):
1354 hash_index = bond_xmit_hash(bond, skb);
1355 if (bond->params.tlb_dynamic_lb) {
1356 tx_slave = tlb_choose_channel(bond,
1357 hash_index & 0xFF,
1358 skb->len);
1359 } else {
1360 struct bond_up_slave *slaves;
1361 unsigned int count;
1362
1363 slaves = rcu_dereference(bond->slave_arr);
1364 count = slaves ? READ_ONCE(slaves->count) : 0;
1365 if (likely(count))
1366 tx_slave = slaves->arr[hash_index %
1367 count];
1368 }
1369 break;
1370 }
1371 }
1372 return bond_do_alb_xmit(skb, bond, tx_slave);
1373}
1374
1375netdev_tx_t bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1376{
1377 struct bonding *bond = netdev_priv(bond_dev);
1378 struct ethhdr *eth_data;
1379 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1380 struct slave *tx_slave = NULL;
1381 static const __be32 ip_bcast = htonl(0xffffffff);
1382 int hash_size = 0;
1383 bool do_tx_balance = true;
1384 u32 hash_index = 0;
1385 const u8 *hash_start = NULL;
1386 struct ipv6hdr *ip6hdr;
1387
1388 skb_reset_mac_header(skb);
1389 eth_data = eth_hdr(skb);
1390
1391 switch (ntohs(skb->protocol)) {
1392 case ETH_P_IP: {
1393 const struct iphdr *iph = ip_hdr(skb);
1394
1395 if (is_broadcast_ether_addr(eth_data->h_dest) ||
1396 iph->daddr == ip_bcast ||
1397 iph->protocol == IPPROTO_IGMP) {
1398 do_tx_balance = false;
1399 break;
1400 }
1401 hash_start = (char *)&(iph->daddr);
1402 hash_size = sizeof(iph->daddr);
1403 }
1404 break;
1405 case ETH_P_IPV6:
1406 /* IPv6 doesn't really use broadcast mac address, but leave
1407 * that here just in case.
1408 */
1409 if (is_broadcast_ether_addr(eth_data->h_dest)) {
1410 do_tx_balance = false;
1411 break;
1412 }
1413
1414 /* IPv6 uses all-nodes multicast as an equivalent to
1415 * broadcasts in IPv4.
1416 */
1417 if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) {
1418 do_tx_balance = false;
1419 break;
1420 }
1421
1422 /* Additianally, DAD probes should not be tx-balanced as that
1423 * will lead to false positives for duplicate addresses and
1424 * prevent address configuration from working.
1425 */
1426 ip6hdr = ipv6_hdr(skb);
1427 if (ipv6_addr_any(&ip6hdr->saddr)) {
1428 do_tx_balance = false;
1429 break;
1430 }
1431
1432 hash_start = (char *)&(ipv6_hdr(skb)->daddr);
1433 hash_size = sizeof(ipv6_hdr(skb)->daddr);
1434 break;
1435 case ETH_P_IPX:
1436 if (ipx_hdr(skb)->ipx_checksum != IPX_NO_CHECKSUM) {
1437 /* something is wrong with this packet */
1438 do_tx_balance = false;
1439 break;
1440 }
1441
1442 if (ipx_hdr(skb)->ipx_type != IPX_TYPE_NCP) {
1443 /* The only protocol worth balancing in
1444 * this family since it has an "ARP" like
1445 * mechanism
1446 */
1447 do_tx_balance = false;
1448 break;
1449 }
1450
1451 hash_start = (char *)eth_data->h_dest;
1452 hash_size = ETH_ALEN;
1453 break;
1454 case ETH_P_ARP:
1455 do_tx_balance = false;
1456 if (bond_info->rlb_enabled)
1457 tx_slave = rlb_arp_xmit(skb, bond);
1458 break;
1459 default:
1460 do_tx_balance = false;
1461 break;
1462 }
1463
1464 if (do_tx_balance) {
1465 if (bond->params.tlb_dynamic_lb) {
1466 hash_index = _simple_hash(hash_start, hash_size);
1467 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1468 } else {
1469 /*
1470 * do_tx_balance means we are free to select the tx_slave
1471 * So we do exactly what tlb would do for hash selection
1472 */
1473
1474 struct bond_up_slave *slaves;
1475 unsigned int count;
1476
1477 slaves = rcu_dereference(bond->slave_arr);
1478 count = slaves ? READ_ONCE(slaves->count) : 0;
1479 if (likely(count))
1480 tx_slave = slaves->arr[bond_xmit_hash(bond, skb) %
1481 count];
1482 }
1483 }
1484
1485 return bond_do_alb_xmit(skb, bond, tx_slave);
1486}
1487
1488void bond_alb_monitor(struct work_struct *work)
1489{
1490 struct bonding *bond = container_of(work, struct bonding,
1491 alb_work.work);
1492 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1493 struct list_head *iter;
1494 struct slave *slave;
1495
1496 if (!bond_has_slaves(bond)) {
1497 bond_info->tx_rebalance_counter = 0;
1498 bond_info->lp_counter = 0;
1499 goto re_arm;
1500 }
1501
1502 rcu_read_lock();
1503
1504 bond_info->tx_rebalance_counter++;
1505 bond_info->lp_counter++;
1506
1507 /* send learning packets */
1508 if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) {
1509 bool strict_match;
1510
1511 bond_for_each_slave_rcu(bond, slave, iter) {
1512 /* If updating current_active, use all currently
1513 * user mac addreses (!strict_match). Otherwise, only
1514 * use mac of the slave device.
1515 * In RLB mode, we always use strict matches.
1516 */
1517 strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) ||
1518 bond_info->rlb_enabled);
1519 alb_send_learning_packets(slave, slave->dev->dev_addr,
1520 strict_match);
1521 }
1522 bond_info->lp_counter = 0;
1523 }
1524
1525 /* rebalance tx traffic */
1526 if (bond_info->tx_rebalance_counter >= BOND_TLB_REBALANCE_TICKS) {
1527 bond_for_each_slave_rcu(bond, slave, iter) {
1528 tlb_clear_slave(bond, slave, 1);
1529 if (slave == rcu_access_pointer(bond->curr_active_slave)) {
1530 SLAVE_TLB_INFO(slave).load =
1531 bond_info->unbalanced_load /
1532 BOND_TLB_REBALANCE_INTERVAL;
1533 bond_info->unbalanced_load = 0;
1534 }
1535 }
1536 bond_info->tx_rebalance_counter = 0;
1537 }
1538
1539 if (bond_info->rlb_enabled) {
1540 if (bond_info->primary_is_promisc &&
1541 (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1542
1543 /* dev_set_promiscuity requires rtnl and
1544 * nothing else. Avoid race with bond_close.
1545 */
1546 rcu_read_unlock();
1547 if (!rtnl_trylock())
1548 goto re_arm;
1549
1550 bond_info->rlb_promisc_timeout_counter = 0;
1551
1552 /* If the primary was set to promiscuous mode
1553 * because a slave was disabled then
1554 * it can now leave promiscuous mode.
1555 */
1556 dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev,
1557 -1);
1558 bond_info->primary_is_promisc = 0;
1559
1560 rtnl_unlock();
1561 rcu_read_lock();
1562 }
1563
1564 if (bond_info->rlb_rebalance) {
1565 bond_info->rlb_rebalance = 0;
1566 rlb_rebalance(bond);
1567 }
1568
1569 /* check if clients need updating */
1570 if (bond_info->rx_ntt) {
1571 if (bond_info->rlb_update_delay_counter) {
1572 --bond_info->rlb_update_delay_counter;
1573 } else {
1574 rlb_update_rx_clients(bond);
1575 if (bond_info->rlb_update_retry_counter)
1576 --bond_info->rlb_update_retry_counter;
1577 else
1578 bond_info->rx_ntt = 0;
1579 }
1580 }
1581 }
1582 rcu_read_unlock();
1583re_arm:
1584 queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
1585}
1586
1587/* assumption: called before the slave is attached to the bond
1588 * and not locked by the bond lock
1589 */
1590int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1591{
1592 int res;
1593
1594 res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr,
1595 slave->dev->addr_len);
1596 if (res)
1597 return res;
1598
1599 res = alb_handle_addr_collision_on_attach(bond, slave);
1600 if (res)
1601 return res;
1602
1603 tlb_init_slave(slave);
1604
1605 /* order a rebalance ASAP */
1606 bond->alb_info.tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1607
1608 if (bond->alb_info.rlb_enabled)
1609 bond->alb_info.rlb_rebalance = 1;
1610
1611 return 0;
1612}
1613
1614/* Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1615 * if necessary.
1616 *
1617 * Caller must hold RTNL and no other locks
1618 */
1619void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1620{
1621 if (bond_has_slaves(bond))
1622 alb_change_hw_addr_on_detach(bond, slave);
1623
1624 tlb_clear_slave(bond, slave, 0);
1625
1626 if (bond->alb_info.rlb_enabled) {
1627 bond->alb_info.rx_slave = NULL;
1628 rlb_clear_slave(bond, slave);
1629 }
1630
1631}
1632
1633void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1634{
1635 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1636
1637 if (link == BOND_LINK_DOWN) {
1638 tlb_clear_slave(bond, slave, 0);
1639 if (bond->alb_info.rlb_enabled)
1640 rlb_clear_slave(bond, slave);
1641 } else if (link == BOND_LINK_UP) {
1642 /* order a rebalance ASAP */
1643 bond_info->tx_rebalance_counter = BOND_TLB_REBALANCE_TICKS;
1644 if (bond->alb_info.rlb_enabled) {
1645 bond->alb_info.rlb_rebalance = 1;
1646 /* If the updelay module parameter is smaller than the
1647 * forwarding delay of the switch the rebalance will
1648 * not work because the rebalance arp replies will
1649 * not be forwarded to the clients..
1650 */
1651 }
1652 }
1653
1654 if (bond_is_nondyn_tlb(bond)) {
1655 if (bond_update_slave_arr(bond, NULL))
1656 pr_err("Failed to build slave-array for TLB mode.\n");
1657 }
1658}
1659
1660/**
1661 * bond_alb_handle_active_change - assign new curr_active_slave
1662 * @bond: our bonding struct
1663 * @new_slave: new slave to assign
1664 *
1665 * Set the bond->curr_active_slave to @new_slave and handle
1666 * mac address swapping and promiscuity changes as needed.
1667 *
1668 * Caller must hold RTNL
1669 */
1670void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1671{
1672 struct slave *swap_slave;
1673 struct slave *curr_active;
1674
1675 curr_active = rtnl_dereference(bond->curr_active_slave);
1676 if (curr_active == new_slave)
1677 return;
1678
1679 if (curr_active && bond->alb_info.primary_is_promisc) {
1680 dev_set_promiscuity(curr_active->dev, -1);
1681 bond->alb_info.primary_is_promisc = 0;
1682 bond->alb_info.rlb_promisc_timeout_counter = 0;
1683 }
1684
1685 swap_slave = curr_active;
1686 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1687
1688 if (!new_slave || !bond_has_slaves(bond))
1689 return;
1690
1691 /* set the new curr_active_slave to the bonds mac address
1692 * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1693 */
1694 if (!swap_slave)
1695 swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr);
1696
1697 /* Arrange for swap_slave and new_slave to temporarily be
1698 * ignored so we can mess with their MAC addresses without
1699 * fear of interference from transmit activity.
1700 */
1701 if (swap_slave)
1702 tlb_clear_slave(bond, swap_slave, 1);
1703 tlb_clear_slave(bond, new_slave, 1);
1704
1705 /* in TLB mode, the slave might flip down/up with the old dev_addr,
1706 * and thus filter bond->dev_addr's packets, so force bond's mac
1707 */
1708 if (BOND_MODE(bond) == BOND_MODE_TLB) {
1709 struct sockaddr_storage ss;
1710 u8 tmp_addr[MAX_ADDR_LEN];
1711
1712 bond_hw_addr_copy(tmp_addr, new_slave->dev->dev_addr,
1713 new_slave->dev->addr_len);
1714
1715 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
1716 bond->dev->addr_len);
1717 ss.ss_family = bond->dev->type;
1718 /* we don't care if it can't change its mac, best effort */
1719 dev_set_mac_address(new_slave->dev, (struct sockaddr *)&ss,
1720 NULL);
1721
1722 bond_hw_addr_copy(new_slave->dev->dev_addr, tmp_addr,
1723 new_slave->dev->addr_len);
1724 }
1725
1726 /* curr_active_slave must be set before calling alb_swap_mac_addr */
1727 if (swap_slave) {
1728 /* swap mac address */
1729 alb_swap_mac_addr(swap_slave, new_slave);
1730 alb_fasten_mac_swap(bond, swap_slave, new_slave);
1731 } else {
1732 /* set the new_slave to the bond mac address */
1733 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr,
1734 bond->dev->addr_len);
1735 alb_send_learning_packets(new_slave, bond->dev->dev_addr,
1736 false);
1737 }
1738}
1739
1740/* Called with RTNL */
1741int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1742{
1743 struct bonding *bond = netdev_priv(bond_dev);
1744 struct sockaddr_storage *ss = addr;
1745 struct slave *curr_active;
1746 struct slave *swap_slave;
1747 int res;
1748
1749 if (!is_valid_ether_addr(ss->__data))
1750 return -EADDRNOTAVAIL;
1751
1752 res = alb_set_mac_address(bond, addr);
1753 if (res)
1754 return res;
1755
1756 bond_hw_addr_copy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
1757
1758 /* If there is no curr_active_slave there is nothing else to do.
1759 * Otherwise we'll need to pass the new address to it and handle
1760 * duplications.
1761 */
1762 curr_active = rtnl_dereference(bond->curr_active_slave);
1763 if (!curr_active)
1764 return 0;
1765
1766 swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr);
1767
1768 if (swap_slave) {
1769 alb_swap_mac_addr(swap_slave, curr_active);
1770 alb_fasten_mac_swap(bond, swap_slave, curr_active);
1771 } else {
1772 alb_set_slave_mac_addr(curr_active, bond_dev->dev_addr,
1773 bond_dev->addr_len);
1774
1775 alb_send_learning_packets(curr_active,
1776 bond_dev->dev_addr, false);
1777 if (bond->alb_info.rlb_enabled) {
1778 /* inform clients mac address has changed */
1779 rlb_req_update_slave_clients(bond, curr_active);
1780 }
1781 }
1782
1783 return 0;
1784}
1785
1786void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1787{
1788 if (bond->alb_info.rlb_enabled)
1789 rlb_clear_vlan(bond, vlan_id);
1790}
1791