Loading...
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/arp.h>
21#include <net/ipv6.h>
22#include <net/ndisc.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
53/* Forward declaration */
54static void alb_send_learning_packets(struct slave *slave, const u8 mac_addr[],
55 bool strict_match);
56static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp);
57static void rlb_src_unlink(struct bonding *bond, u32 index);
58static void rlb_src_link(struct bonding *bond, u32 ip_src_hash,
59 u32 ip_dst_hash);
60
61static inline u8 _simple_hash(const u8 *hash_start, int hash_size)
62{
63 int i;
64 u8 hash = 0;
65
66 for (i = 0; i < hash_size; i++)
67 hash ^= hash_start[i];
68
69 return hash;
70}
71
72/*********************** tlb specific functions ***************************/
73
74static inline void tlb_init_table_entry(struct tlb_client_info *entry, int save_load)
75{
76 if (save_load) {
77 entry->load_history = 1 + entry->tx_bytes /
78 BOND_TLB_REBALANCE_INTERVAL;
79 entry->tx_bytes = 0;
80 }
81
82 entry->tx_slave = NULL;
83 entry->next = TLB_NULL_INDEX;
84 entry->prev = TLB_NULL_INDEX;
85}
86
87static inline void tlb_init_slave(struct slave *slave)
88{
89 SLAVE_TLB_INFO(slave).load = 0;
90 SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
91}
92
93static void __tlb_clear_slave(struct bonding *bond, struct slave *slave,
94 int save_load)
95{
96 struct tlb_client_info *tx_hash_table;
97 u32 index;
98
99 /* clear slave from tx_hashtbl */
100 tx_hash_table = BOND_ALB_INFO(bond).tx_hashtbl;
101
102 /* skip this if we've already freed the tx hash table */
103 if (tx_hash_table) {
104 index = SLAVE_TLB_INFO(slave).head;
105 while (index != TLB_NULL_INDEX) {
106 u32 next_index = tx_hash_table[index].next;
107
108 tlb_init_table_entry(&tx_hash_table[index], save_load);
109 index = next_index;
110 }
111 }
112
113 tlb_init_slave(slave);
114}
115
116static void tlb_clear_slave(struct bonding *bond, struct slave *slave,
117 int save_load)
118{
119 spin_lock_bh(&bond->mode_lock);
120 __tlb_clear_slave(bond, slave, save_load);
121 spin_unlock_bh(&bond->mode_lock);
122}
123
124/* Must be called before starting the monitor timer */
125static int tlb_initialize(struct bonding *bond)
126{
127 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
128 int size = TLB_HASH_TABLE_SIZE * sizeof(struct tlb_client_info);
129 struct tlb_client_info *new_hashtbl;
130 int i;
131
132 new_hashtbl = kzalloc(size, GFP_KERNEL);
133 if (!new_hashtbl)
134 return -ENOMEM;
135
136 spin_lock_bh(&bond->mode_lock);
137
138 bond_info->tx_hashtbl = new_hashtbl;
139
140 for (i = 0; i < TLB_HASH_TABLE_SIZE; i++)
141 tlb_init_table_entry(&bond_info->tx_hashtbl[i], 0);
142
143 spin_unlock_bh(&bond->mode_lock);
144
145 return 0;
146}
147
148/* Must be called only after all slaves have been released */
149static void tlb_deinitialize(struct bonding *bond)
150{
151 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
152
153 spin_lock_bh(&bond->mode_lock);
154
155 kfree(bond_info->tx_hashtbl);
156 bond_info->tx_hashtbl = NULL;
157
158 spin_unlock_bh(&bond->mode_lock);
159}
160
161static long long compute_gap(struct slave *slave)
162{
163 return (s64) (slave->speed << 20) - /* Convert to Megabit per sec */
164 (s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
165}
166
167static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
168{
169 struct slave *slave, *least_loaded;
170 struct list_head *iter;
171 long long max_gap;
172
173 least_loaded = NULL;
174 max_gap = LLONG_MIN;
175
176 /* Find the slave with the largest gap */
177 bond_for_each_slave_rcu(bond, slave, iter) {
178 if (bond_slave_can_tx(slave)) {
179 long long gap = compute_gap(slave);
180
181 if (max_gap < gap) {
182 least_loaded = slave;
183 max_gap = gap;
184 }
185 }
186 }
187
188 return least_loaded;
189}
190
191static struct slave *__tlb_choose_channel(struct bonding *bond, u32 hash_index,
192 u32 skb_len)
193{
194 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
195 struct tlb_client_info *hash_table;
196 struct slave *assigned_slave;
197
198 hash_table = bond_info->tx_hashtbl;
199 assigned_slave = hash_table[hash_index].tx_slave;
200 if (!assigned_slave) {
201 assigned_slave = tlb_get_least_loaded_slave(bond);
202
203 if (assigned_slave) {
204 struct tlb_slave_info *slave_info =
205 &(SLAVE_TLB_INFO(assigned_slave));
206 u32 next_index = slave_info->head;
207
208 hash_table[hash_index].tx_slave = assigned_slave;
209 hash_table[hash_index].next = next_index;
210 hash_table[hash_index].prev = TLB_NULL_INDEX;
211
212 if (next_index != TLB_NULL_INDEX)
213 hash_table[next_index].prev = hash_index;
214
215 slave_info->head = hash_index;
216 slave_info->load +=
217 hash_table[hash_index].load_history;
218 }
219 }
220
221 if (assigned_slave)
222 hash_table[hash_index].tx_bytes += skb_len;
223
224 return assigned_slave;
225}
226
227static struct slave *tlb_choose_channel(struct bonding *bond, u32 hash_index,
228 u32 skb_len)
229{
230 struct slave *tx_slave;
231
232 /* We don't need to disable softirq here, because
233 * tlb_choose_channel() is only called by bond_alb_xmit()
234 * which already has softirq disabled.
235 */
236 spin_lock(&bond->mode_lock);
237 tx_slave = __tlb_choose_channel(bond, hash_index, skb_len);
238 spin_unlock(&bond->mode_lock);
239
240 return tx_slave;
241}
242
243/*********************** rlb specific functions ***************************/
244
245/* when an ARP REPLY is received from a client update its info
246 * in the rx_hashtbl
247 */
248static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp)
249{
250 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
251 struct rlb_client_info *client_info;
252 u32 hash_index;
253
254 spin_lock_bh(&bond->mode_lock);
255
256 hash_index = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
257 client_info = &(bond_info->rx_hashtbl[hash_index]);
258
259 if ((client_info->assigned) &&
260 (client_info->ip_src == arp->ip_dst) &&
261 (client_info->ip_dst == arp->ip_src) &&
262 (!ether_addr_equal_64bits(client_info->mac_dst, arp->mac_src))) {
263 /* update the clients MAC address */
264 ether_addr_copy(client_info->mac_dst, arp->mac_src);
265 client_info->ntt = 1;
266 bond_info->rx_ntt = 1;
267 }
268
269 spin_unlock_bh(&bond->mode_lock);
270}
271
272static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond,
273 struct slave *slave)
274{
275 struct arp_pkt *arp, _arp;
276
277 if (skb->protocol != cpu_to_be16(ETH_P_ARP))
278 goto out;
279
280 arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp);
281 if (!arp)
282 goto out;
283
284 /* We received an ARP from arp->ip_src.
285 * We might have used this IP address previously (on the bonding host
286 * itself or on a system that is bridged together with the bond).
287 * However, if arp->mac_src is different than what is stored in
288 * rx_hashtbl, some other host is now using the IP and we must prevent
289 * sending out client updates with this IP address and the old MAC
290 * address.
291 * Clean up all hash table entries that have this address as ip_src but
292 * have a different mac_src.
293 */
294 rlb_purge_src_ip(bond, arp);
295
296 if (arp->op_code == htons(ARPOP_REPLY)) {
297 /* update rx hash table for this ARP */
298 rlb_update_entry_from_arp(bond, arp);
299 slave_dbg(bond->dev, slave->dev, "Server received an ARP Reply from client\n");
300 }
301out:
302 return RX_HANDLER_ANOTHER;
303}
304
305/* Caller must hold rcu_read_lock() */
306static struct slave *__rlb_next_rx_slave(struct bonding *bond)
307{
308 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
309 struct slave *before = NULL, *rx_slave = NULL, *slave;
310 struct list_head *iter;
311 bool found = false;
312
313 bond_for_each_slave_rcu(bond, slave, iter) {
314 if (!bond_slave_can_tx(slave))
315 continue;
316 if (!found) {
317 if (!before || before->speed < slave->speed)
318 before = slave;
319 } else {
320 if (!rx_slave || rx_slave->speed < slave->speed)
321 rx_slave = slave;
322 }
323 if (slave == bond_info->rx_slave)
324 found = true;
325 }
326 /* we didn't find anything after the current or we have something
327 * better before and up to the current slave
328 */
329 if (!rx_slave || (before && rx_slave->speed < before->speed))
330 rx_slave = before;
331
332 if (rx_slave)
333 bond_info->rx_slave = rx_slave;
334
335 return rx_slave;
336}
337
338/* Caller must hold RTNL, rcu_read_lock is obtained only to silence checkers */
339static struct slave *rlb_next_rx_slave(struct bonding *bond)
340{
341 struct slave *rx_slave;
342
343 ASSERT_RTNL();
344
345 rcu_read_lock();
346 rx_slave = __rlb_next_rx_slave(bond);
347 rcu_read_unlock();
348
349 return rx_slave;
350}
351
352/* teach the switch the mac of a disabled slave
353 * on the primary for fault tolerance
354 *
355 * Caller must hold RTNL
356 */
357static void rlb_teach_disabled_mac_on_primary(struct bonding *bond,
358 const u8 addr[])
359{
360 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
361
362 if (!curr_active)
363 return;
364
365 if (!bond->alb_info.primary_is_promisc) {
366 if (!dev_set_promiscuity(curr_active->dev, 1))
367 bond->alb_info.primary_is_promisc = 1;
368 else
369 bond->alb_info.primary_is_promisc = 0;
370 }
371
372 bond->alb_info.rlb_promisc_timeout_counter = 0;
373
374 alb_send_learning_packets(curr_active, addr, true);
375}
376
377/* slave being removed should not be active at this point
378 *
379 * Caller must hold rtnl.
380 */
381static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
382{
383 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
384 struct rlb_client_info *rx_hash_table;
385 u32 index, next_index;
386
387 /* clear slave from rx_hashtbl */
388 spin_lock_bh(&bond->mode_lock);
389
390 rx_hash_table = bond_info->rx_hashtbl;
391 index = bond_info->rx_hashtbl_used_head;
392 for (; index != RLB_NULL_INDEX; index = next_index) {
393 next_index = rx_hash_table[index].used_next;
394 if (rx_hash_table[index].slave == slave) {
395 struct slave *assigned_slave = rlb_next_rx_slave(bond);
396
397 if (assigned_slave) {
398 rx_hash_table[index].slave = assigned_slave;
399 if (is_valid_ether_addr(rx_hash_table[index].mac_dst)) {
400 bond_info->rx_hashtbl[index].ntt = 1;
401 bond_info->rx_ntt = 1;
402 /* A slave has been removed from the
403 * table because it is either disabled
404 * or being released. We must retry the
405 * update to avoid clients from not
406 * being updated & disconnecting when
407 * there is stress
408 */
409 bond_info->rlb_update_retry_counter =
410 RLB_UPDATE_RETRY;
411 }
412 } else { /* there is no active slave */
413 rx_hash_table[index].slave = NULL;
414 }
415 }
416 }
417
418 spin_unlock_bh(&bond->mode_lock);
419
420 if (slave != rtnl_dereference(bond->curr_active_slave))
421 rlb_teach_disabled_mac_on_primary(bond, slave->dev->dev_addr);
422}
423
424static void rlb_update_client(struct rlb_client_info *client_info)
425{
426 int i;
427
428 if (!client_info->slave || !is_valid_ether_addr(client_info->mac_dst))
429 return;
430
431 for (i = 0; i < RLB_ARP_BURST_SIZE; i++) {
432 struct sk_buff *skb;
433
434 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
435 client_info->ip_dst,
436 client_info->slave->dev,
437 client_info->ip_src,
438 client_info->mac_dst,
439 client_info->slave->dev->dev_addr,
440 client_info->mac_dst);
441 if (!skb) {
442 slave_err(client_info->slave->bond->dev,
443 client_info->slave->dev,
444 "failed to create an ARP packet\n");
445 continue;
446 }
447
448 skb->dev = client_info->slave->dev;
449
450 if (client_info->vlan_id) {
451 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
452 client_info->vlan_id);
453 }
454
455 arp_xmit(skb);
456 }
457}
458
459/* sends ARP REPLIES that update the clients that need updating */
460static void rlb_update_rx_clients(struct bonding *bond)
461{
462 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
463 struct rlb_client_info *client_info;
464 u32 hash_index;
465
466 spin_lock_bh(&bond->mode_lock);
467
468 hash_index = bond_info->rx_hashtbl_used_head;
469 for (; hash_index != RLB_NULL_INDEX;
470 hash_index = client_info->used_next) {
471 client_info = &(bond_info->rx_hashtbl[hash_index]);
472 if (client_info->ntt) {
473 rlb_update_client(client_info);
474 if (bond_info->rlb_update_retry_counter == 0)
475 client_info->ntt = 0;
476 }
477 }
478
479 /* do not update the entries again until this counter is zero so that
480 * not to confuse the clients.
481 */
482 bond_info->rlb_update_delay_counter = RLB_UPDATE_DELAY;
483
484 spin_unlock_bh(&bond->mode_lock);
485}
486
487/* The slave was assigned a new mac address - update the clients */
488static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *slave)
489{
490 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
491 struct rlb_client_info *client_info;
492 int ntt = 0;
493 u32 hash_index;
494
495 spin_lock_bh(&bond->mode_lock);
496
497 hash_index = bond_info->rx_hashtbl_used_head;
498 for (; hash_index != RLB_NULL_INDEX;
499 hash_index = client_info->used_next) {
500 client_info = &(bond_info->rx_hashtbl[hash_index]);
501
502 if ((client_info->slave == slave) &&
503 is_valid_ether_addr(client_info->mac_dst)) {
504 client_info->ntt = 1;
505 ntt = 1;
506 }
507 }
508
509 /* update the team's flag only after the whole iteration */
510 if (ntt) {
511 bond_info->rx_ntt = 1;
512 /* fasten the change */
513 bond_info->rlb_update_retry_counter = RLB_UPDATE_RETRY;
514 }
515
516 spin_unlock_bh(&bond->mode_lock);
517}
518
519/* mark all clients using src_ip to be updated */
520static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
521{
522 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
523 struct rlb_client_info *client_info;
524 u32 hash_index;
525
526 spin_lock(&bond->mode_lock);
527
528 hash_index = bond_info->rx_hashtbl_used_head;
529 for (; hash_index != RLB_NULL_INDEX;
530 hash_index = client_info->used_next) {
531 client_info = &(bond_info->rx_hashtbl[hash_index]);
532
533 if (!client_info->slave) {
534 netdev_err(bond->dev, "found a client with no channel in the client's hash table\n");
535 continue;
536 }
537 /* update all clients using this src_ip, that are not assigned
538 * to the team's address (curr_active_slave) and have a known
539 * unicast mac address.
540 */
541 if ((client_info->ip_src == src_ip) &&
542 !ether_addr_equal_64bits(client_info->slave->dev->dev_addr,
543 bond->dev->dev_addr) &&
544 is_valid_ether_addr(client_info->mac_dst)) {
545 client_info->ntt = 1;
546 bond_info->rx_ntt = 1;
547 }
548 }
549
550 spin_unlock(&bond->mode_lock);
551}
552
553static struct slave *rlb_choose_channel(struct sk_buff *skb,
554 struct bonding *bond,
555 const struct arp_pkt *arp)
556{
557 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
558 struct slave *assigned_slave, *curr_active_slave;
559 struct rlb_client_info *client_info;
560 u32 hash_index = 0;
561
562 spin_lock(&bond->mode_lock);
563
564 curr_active_slave = rcu_dereference(bond->curr_active_slave);
565
566 hash_index = _simple_hash((u8 *)&arp->ip_dst, sizeof(arp->ip_dst));
567 client_info = &(bond_info->rx_hashtbl[hash_index]);
568
569 if (client_info->assigned) {
570 if ((client_info->ip_src == arp->ip_src) &&
571 (client_info->ip_dst == arp->ip_dst)) {
572 /* the entry is already assigned to this client */
573 if (!is_broadcast_ether_addr(arp->mac_dst)) {
574 /* update mac address from arp */
575 ether_addr_copy(client_info->mac_dst, arp->mac_dst);
576 }
577 ether_addr_copy(client_info->mac_src, arp->mac_src);
578
579 assigned_slave = client_info->slave;
580 if (assigned_slave) {
581 spin_unlock(&bond->mode_lock);
582 return assigned_slave;
583 }
584 } else {
585 /* the entry is already assigned to some other client,
586 * move the old client to primary (curr_active_slave) so
587 * that the new client can be assigned to this entry.
588 */
589 if (curr_active_slave &&
590 client_info->slave != curr_active_slave) {
591 client_info->slave = curr_active_slave;
592 rlb_update_client(client_info);
593 }
594 }
595 }
596 /* assign a new slave */
597 assigned_slave = __rlb_next_rx_slave(bond);
598
599 if (assigned_slave) {
600 if (!(client_info->assigned &&
601 client_info->ip_src == arp->ip_src)) {
602 /* ip_src is going to be updated,
603 * fix the src hash list
604 */
605 u32 hash_src = _simple_hash((u8 *)&arp->ip_src,
606 sizeof(arp->ip_src));
607 rlb_src_unlink(bond, hash_index);
608 rlb_src_link(bond, hash_src, hash_index);
609 }
610
611 client_info->ip_src = arp->ip_src;
612 client_info->ip_dst = arp->ip_dst;
613 /* arp->mac_dst is broadcast for arp requests.
614 * will be updated with clients actual unicast mac address
615 * upon receiving an arp reply.
616 */
617 ether_addr_copy(client_info->mac_dst, arp->mac_dst);
618 ether_addr_copy(client_info->mac_src, arp->mac_src);
619 client_info->slave = assigned_slave;
620
621 if (is_valid_ether_addr(client_info->mac_dst)) {
622 client_info->ntt = 1;
623 bond->alb_info.rx_ntt = 1;
624 } else {
625 client_info->ntt = 0;
626 }
627
628 if (vlan_get_tag(skb, &client_info->vlan_id))
629 client_info->vlan_id = 0;
630
631 if (!client_info->assigned) {
632 u32 prev_tbl_head = bond_info->rx_hashtbl_used_head;
633
634 bond_info->rx_hashtbl_used_head = hash_index;
635 client_info->used_next = prev_tbl_head;
636 if (prev_tbl_head != RLB_NULL_INDEX) {
637 bond_info->rx_hashtbl[prev_tbl_head].used_prev =
638 hash_index;
639 }
640 client_info->assigned = 1;
641 }
642 }
643
644 spin_unlock(&bond->mode_lock);
645
646 return assigned_slave;
647}
648
649/* chooses (and returns) transmit channel for arp reply
650 * does not choose channel for other arp types since they are
651 * sent on the curr_active_slave
652 */
653static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
654{
655 struct slave *tx_slave = NULL;
656 struct net_device *dev;
657 struct arp_pkt *arp;
658
659 if (!pskb_network_may_pull(skb, sizeof(*arp)))
660 return NULL;
661 arp = (struct arp_pkt *)skb_network_header(skb);
662
663 /* Don't modify or load balance ARPs that do not originate
664 * from the bond itself or a VLAN directly above the bond.
665 */
666 if (!bond_slave_has_mac_rcu(bond, arp->mac_src))
667 return NULL;
668
669 dev = ip_dev_find(dev_net(bond->dev), arp->ip_src);
670 if (dev) {
671 if (netif_is_any_bridge_master(dev)) {
672 dev_put(dev);
673 return NULL;
674 }
675 dev_put(dev);
676 }
677
678 if (arp->op_code == htons(ARPOP_REPLY)) {
679 /* the arp must be sent on the selected rx channel */
680 tx_slave = rlb_choose_channel(skb, bond, arp);
681 if (tx_slave)
682 bond_hw_addr_copy(arp->mac_src, tx_slave->dev->dev_addr,
683 tx_slave->dev->addr_len);
684 netdev_dbg(bond->dev, "(slave %s): Server sent ARP Reply packet\n",
685 tx_slave ? tx_slave->dev->name : "NULL");
686 } else if (arp->op_code == htons(ARPOP_REQUEST)) {
687 /* Create an entry in the rx_hashtbl for this client as a
688 * place holder.
689 * When the arp reply is received the entry will be updated
690 * with the correct unicast address of the client.
691 */
692 tx_slave = rlb_choose_channel(skb, bond, arp);
693
694 /* The ARP reply packets must be delayed so that
695 * they can cancel out the influence of the ARP request.
696 */
697 bond->alb_info.rlb_update_delay_counter = RLB_UPDATE_DELAY;
698
699 /* arp requests are broadcast and are sent on the primary
700 * the arp request will collapse all clients on the subnet to
701 * the primary slave. We must register these clients to be
702 * updated with their assigned mac.
703 */
704 rlb_req_update_subnet_clients(bond, arp->ip_src);
705 netdev_dbg(bond->dev, "(slave %s): Server sent ARP Request packet\n",
706 tx_slave ? tx_slave->dev->name : "NULL");
707 }
708
709 return tx_slave;
710}
711
712static void rlb_rebalance(struct bonding *bond)
713{
714 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
715 struct slave *assigned_slave;
716 struct rlb_client_info *client_info;
717 int ntt;
718 u32 hash_index;
719
720 spin_lock_bh(&bond->mode_lock);
721
722 ntt = 0;
723 hash_index = bond_info->rx_hashtbl_used_head;
724 for (; hash_index != RLB_NULL_INDEX;
725 hash_index = client_info->used_next) {
726 client_info = &(bond_info->rx_hashtbl[hash_index]);
727 assigned_slave = __rlb_next_rx_slave(bond);
728 if (assigned_slave && (client_info->slave != assigned_slave)) {
729 client_info->slave = assigned_slave;
730 if (!is_zero_ether_addr(client_info->mac_dst)) {
731 client_info->ntt = 1;
732 ntt = 1;
733 }
734 }
735 }
736
737 /* update the team's flag only after the whole iteration */
738 if (ntt)
739 bond_info->rx_ntt = 1;
740 spin_unlock_bh(&bond->mode_lock);
741}
742
743/* Caller must hold mode_lock */
744static void rlb_init_table_entry_dst(struct rlb_client_info *entry)
745{
746 entry->used_next = RLB_NULL_INDEX;
747 entry->used_prev = RLB_NULL_INDEX;
748 entry->assigned = 0;
749 entry->slave = NULL;
750 entry->vlan_id = 0;
751}
752static void rlb_init_table_entry_src(struct rlb_client_info *entry)
753{
754 entry->src_first = RLB_NULL_INDEX;
755 entry->src_prev = RLB_NULL_INDEX;
756 entry->src_next = RLB_NULL_INDEX;
757}
758
759static void rlb_init_table_entry(struct rlb_client_info *entry)
760{
761 memset(entry, 0, sizeof(struct rlb_client_info));
762 rlb_init_table_entry_dst(entry);
763 rlb_init_table_entry_src(entry);
764}
765
766static void rlb_delete_table_entry_dst(struct bonding *bond, u32 index)
767{
768 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
769 u32 next_index = bond_info->rx_hashtbl[index].used_next;
770 u32 prev_index = bond_info->rx_hashtbl[index].used_prev;
771
772 if (index == bond_info->rx_hashtbl_used_head)
773 bond_info->rx_hashtbl_used_head = next_index;
774 if (prev_index != RLB_NULL_INDEX)
775 bond_info->rx_hashtbl[prev_index].used_next = next_index;
776 if (next_index != RLB_NULL_INDEX)
777 bond_info->rx_hashtbl[next_index].used_prev = prev_index;
778}
779
780/* unlink a rlb hash table entry from the src list */
781static void rlb_src_unlink(struct bonding *bond, u32 index)
782{
783 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
784 u32 next_index = bond_info->rx_hashtbl[index].src_next;
785 u32 prev_index = bond_info->rx_hashtbl[index].src_prev;
786
787 bond_info->rx_hashtbl[index].src_next = RLB_NULL_INDEX;
788 bond_info->rx_hashtbl[index].src_prev = RLB_NULL_INDEX;
789
790 if (next_index != RLB_NULL_INDEX)
791 bond_info->rx_hashtbl[next_index].src_prev = prev_index;
792
793 if (prev_index == RLB_NULL_INDEX)
794 return;
795
796 /* is prev_index pointing to the head of this list? */
797 if (bond_info->rx_hashtbl[prev_index].src_first == index)
798 bond_info->rx_hashtbl[prev_index].src_first = next_index;
799 else
800 bond_info->rx_hashtbl[prev_index].src_next = next_index;
801
802}
803
804static void rlb_delete_table_entry(struct bonding *bond, u32 index)
805{
806 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
807 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
808
809 rlb_delete_table_entry_dst(bond, index);
810 rlb_init_table_entry_dst(entry);
811
812 rlb_src_unlink(bond, index);
813}
814
815/* add the rx_hashtbl[ip_dst_hash] entry to the list
816 * of entries with identical ip_src_hash
817 */
818static void rlb_src_link(struct bonding *bond, u32 ip_src_hash, u32 ip_dst_hash)
819{
820 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
821 u32 next;
822
823 bond_info->rx_hashtbl[ip_dst_hash].src_prev = ip_src_hash;
824 next = bond_info->rx_hashtbl[ip_src_hash].src_first;
825 bond_info->rx_hashtbl[ip_dst_hash].src_next = next;
826 if (next != RLB_NULL_INDEX)
827 bond_info->rx_hashtbl[next].src_prev = ip_dst_hash;
828 bond_info->rx_hashtbl[ip_src_hash].src_first = ip_dst_hash;
829}
830
831/* deletes all rx_hashtbl entries with arp->ip_src if their mac_src does
832 * not match arp->mac_src
833 */
834static void rlb_purge_src_ip(struct bonding *bond, struct arp_pkt *arp)
835{
836 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
837 u32 ip_src_hash = _simple_hash((u8 *)&(arp->ip_src), sizeof(arp->ip_src));
838 u32 index;
839
840 spin_lock_bh(&bond->mode_lock);
841
842 index = bond_info->rx_hashtbl[ip_src_hash].src_first;
843 while (index != RLB_NULL_INDEX) {
844 struct rlb_client_info *entry = &(bond_info->rx_hashtbl[index]);
845 u32 next_index = entry->src_next;
846
847 if (entry->ip_src == arp->ip_src &&
848 !ether_addr_equal_64bits(arp->mac_src, entry->mac_src))
849 rlb_delete_table_entry(bond, index);
850 index = next_index;
851 }
852 spin_unlock_bh(&bond->mode_lock);
853}
854
855static int rlb_initialize(struct bonding *bond)
856{
857 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
858 struct rlb_client_info *new_hashtbl;
859 int size = RLB_HASH_TABLE_SIZE * sizeof(struct rlb_client_info);
860 int i;
861
862 new_hashtbl = kmalloc(size, GFP_KERNEL);
863 if (!new_hashtbl)
864 return -1;
865
866 spin_lock_bh(&bond->mode_lock);
867
868 bond_info->rx_hashtbl = new_hashtbl;
869
870 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
871
872 for (i = 0; i < RLB_HASH_TABLE_SIZE; i++)
873 rlb_init_table_entry(bond_info->rx_hashtbl + i);
874
875 spin_unlock_bh(&bond->mode_lock);
876
877 /* register to receive ARPs */
878 bond->recv_probe = rlb_arp_recv;
879
880 return 0;
881}
882
883static void rlb_deinitialize(struct bonding *bond)
884{
885 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
886
887 spin_lock_bh(&bond->mode_lock);
888
889 kfree(bond_info->rx_hashtbl);
890 bond_info->rx_hashtbl = NULL;
891 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
892
893 spin_unlock_bh(&bond->mode_lock);
894}
895
896static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
897{
898 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
899 u32 curr_index;
900
901 spin_lock_bh(&bond->mode_lock);
902
903 curr_index = bond_info->rx_hashtbl_used_head;
904 while (curr_index != RLB_NULL_INDEX) {
905 struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
906 u32 next_index = bond_info->rx_hashtbl[curr_index].used_next;
907
908 if (curr->vlan_id == vlan_id)
909 rlb_delete_table_entry(bond, curr_index);
910
911 curr_index = next_index;
912 }
913
914 spin_unlock_bh(&bond->mode_lock);
915}
916
917/*********************** tlb/rlb shared functions *********************/
918
919static void alb_send_lp_vid(struct slave *slave, const u8 mac_addr[],
920 __be16 vlan_proto, u16 vid)
921{
922 struct learning_pkt pkt;
923 struct sk_buff *skb;
924 int size = sizeof(struct learning_pkt);
925
926 memset(&pkt, 0, size);
927 ether_addr_copy(pkt.mac_dst, mac_addr);
928 ether_addr_copy(pkt.mac_src, mac_addr);
929 pkt.type = cpu_to_be16(ETH_P_LOOPBACK);
930
931 skb = dev_alloc_skb(size);
932 if (!skb)
933 return;
934
935 skb_put_data(skb, &pkt, size);
936
937 skb_reset_mac_header(skb);
938 skb->network_header = skb->mac_header + ETH_HLEN;
939 skb->protocol = pkt.type;
940 skb->priority = TC_PRIO_CONTROL;
941 skb->dev = slave->dev;
942
943 slave_dbg(slave->bond->dev, slave->dev,
944 "Send learning packet: mac %pM vlan %d\n", mac_addr, vid);
945
946 if (vid)
947 __vlan_hwaccel_put_tag(skb, vlan_proto, vid);
948
949 dev_queue_xmit(skb);
950}
951
952struct alb_walk_data {
953 struct bonding *bond;
954 struct slave *slave;
955 const u8 *mac_addr;
956 bool strict_match;
957};
958
959static int alb_upper_dev_walk(struct net_device *upper,
960 struct netdev_nested_priv *priv)
961{
962 struct alb_walk_data *data = (struct alb_walk_data *)priv->data;
963 bool strict_match = data->strict_match;
964 const u8 *mac_addr = data->mac_addr;
965 struct bonding *bond = data->bond;
966 struct slave *slave = data->slave;
967 struct bond_vlan_tag *tags;
968
969 if (is_vlan_dev(upper) &&
970 bond->dev->lower_level == upper->lower_level - 1) {
971 if (upper->addr_assign_type == NET_ADDR_STOLEN) {
972 alb_send_lp_vid(slave, mac_addr,
973 vlan_dev_vlan_proto(upper),
974 vlan_dev_vlan_id(upper));
975 } else {
976 alb_send_lp_vid(slave, upper->dev_addr,
977 vlan_dev_vlan_proto(upper),
978 vlan_dev_vlan_id(upper));
979 }
980 }
981
982 /* If this is a macvlan device, then only send updates
983 * when strict_match is turned off.
984 */
985 if (netif_is_macvlan(upper) && !strict_match) {
986 tags = bond_verify_device_path(bond->dev, upper, 0);
987 if (IS_ERR_OR_NULL(tags))
988 return -ENOMEM;
989
990 alb_send_lp_vid(slave, upper->dev_addr,
991 tags[0].vlan_proto, tags[0].vlan_id);
992 kfree(tags);
993 }
994
995 return 0;
996}
997
998static void alb_send_learning_packets(struct slave *slave, const u8 mac_addr[],
999 bool strict_match)
1000{
1001 struct bonding *bond = bond_get_bond_by_slave(slave);
1002 struct netdev_nested_priv priv;
1003 struct alb_walk_data data = {
1004 .strict_match = strict_match,
1005 .mac_addr = mac_addr,
1006 .slave = slave,
1007 .bond = bond,
1008 };
1009
1010 priv.data = (void *)&data;
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, &priv);
1019 rcu_read_unlock();
1020}
1021
1022static int alb_set_slave_mac_addr(struct slave *slave, const 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 __dev_addr_set(dev, 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, NULL)) {
1039 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");
1040 return -EOPNOTSUPP;
1041 }
1042 return 0;
1043}
1044
1045/* Swap MAC addresses between two slaves.
1046 *
1047 * Called with RTNL held, and no other locks.
1048 */
1049static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2)
1050{
1051 u8 tmp_mac_addr[MAX_ADDR_LEN];
1052
1053 bond_hw_addr_copy(tmp_mac_addr, slave1->dev->dev_addr,
1054 slave1->dev->addr_len);
1055 alb_set_slave_mac_addr(slave1, slave2->dev->dev_addr,
1056 slave2->dev->addr_len);
1057 alb_set_slave_mac_addr(slave2, tmp_mac_addr,
1058 slave1->dev->addr_len);
1059
1060}
1061
1062/* Send learning packets after MAC address swap.
1063 *
1064 * Called with RTNL and no other locks
1065 */
1066static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
1067 struct slave *slave2)
1068{
1069 int slaves_state_differ = (bond_slave_can_tx(slave1) != bond_slave_can_tx(slave2));
1070 struct slave *disabled_slave = NULL;
1071
1072 ASSERT_RTNL();
1073
1074 /* fasten the change in the switch */
1075 if (bond_slave_can_tx(slave1)) {
1076 alb_send_learning_packets(slave1, slave1->dev->dev_addr, false);
1077 if (bond->alb_info.rlb_enabled) {
1078 /* inform the clients that the mac address
1079 * has changed
1080 */
1081 rlb_req_update_slave_clients(bond, slave1);
1082 }
1083 } else {
1084 disabled_slave = slave1;
1085 }
1086
1087 if (bond_slave_can_tx(slave2)) {
1088 alb_send_learning_packets(slave2, slave2->dev->dev_addr, false);
1089 if (bond->alb_info.rlb_enabled) {
1090 /* inform the clients that the mac address
1091 * has changed
1092 */
1093 rlb_req_update_slave_clients(bond, slave2);
1094 }
1095 } else {
1096 disabled_slave = slave2;
1097 }
1098
1099 if (bond->alb_info.rlb_enabled && slaves_state_differ) {
1100 /* A disabled slave was assigned an active mac addr */
1101 rlb_teach_disabled_mac_on_primary(bond,
1102 disabled_slave->dev->dev_addr);
1103 }
1104}
1105
1106/**
1107 * alb_change_hw_addr_on_detach
1108 * @bond: bonding we're working on
1109 * @slave: the slave that was just detached
1110 *
1111 * We assume that @slave was already detached from the slave list.
1112 *
1113 * If @slave's permanent hw address is different both from its current
1114 * address and from @bond's address, then somewhere in the bond there's
1115 * a slave that has @slave's permanet address as its current address.
1116 * We'll make sure that slave no longer uses @slave's permanent address.
1117 *
1118 * Caller must hold RTNL and no other locks
1119 */
1120static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1121{
1122 int perm_curr_diff;
1123 int perm_bond_diff;
1124 struct slave *found_slave;
1125
1126 perm_curr_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1127 slave->dev->dev_addr);
1128 perm_bond_diff = !ether_addr_equal_64bits(slave->perm_hwaddr,
1129 bond->dev->dev_addr);
1130
1131 if (perm_curr_diff && perm_bond_diff) {
1132 found_slave = bond_slave_has_mac(bond, slave->perm_hwaddr);
1133
1134 if (found_slave) {
1135 alb_swap_mac_addr(slave, found_slave);
1136 alb_fasten_mac_swap(bond, slave, found_slave);
1137 }
1138 }
1139}
1140
1141/**
1142 * alb_handle_addr_collision_on_attach
1143 * @bond: bonding we're working on
1144 * @slave: the slave that was just attached
1145 *
1146 * checks uniqueness of slave's mac address and handles the case the
1147 * new slave uses the bonds mac address.
1148 *
1149 * If the permanent hw address of @slave is @bond's hw address, we need to
1150 * find a different hw address to give @slave, that isn't in use by any other
1151 * slave in the bond. This address must be, of course, one of the permanent
1152 * addresses of the other slaves.
1153 *
1154 * We go over the slave list, and for each slave there we compare its
1155 * permanent hw address with the current address of all the other slaves.
1156 * If no match was found, then we've found a slave with a permanent address
1157 * that isn't used by any other slave in the bond, so we can assign it to
1158 * @slave.
1159 *
1160 * assumption: this function is called before @slave is attached to the
1161 * bond slave list.
1162 */
1163static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1164{
1165 struct slave *has_bond_addr = rcu_access_pointer(bond->curr_active_slave);
1166 struct slave *tmp_slave1, *free_mac_slave = NULL;
1167 struct list_head *iter;
1168
1169 if (!bond_has_slaves(bond)) {
1170 /* this is the first slave */
1171 return 0;
1172 }
1173
1174 /* if slave's mac address differs from bond's mac address
1175 * check uniqueness of slave's mac address against the other
1176 * slaves in the bond.
1177 */
1178 if (!ether_addr_equal_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
1179 if (!bond_slave_has_mac(bond, slave->dev->dev_addr))
1180 return 0;
1181
1182 /* Try setting slave mac to bond address and fall-through
1183 * to code handling that situation below...
1184 */
1185 alb_set_slave_mac_addr(slave, bond->dev->dev_addr,
1186 bond->dev->addr_len);
1187 }
1188
1189 /* The slave's address is equal to the address of the bond.
1190 * Search for a spare address in the bond for this slave.
1191 */
1192 bond_for_each_slave(bond, tmp_slave1, iter) {
1193 if (!bond_slave_has_mac(bond, tmp_slave1->perm_hwaddr)) {
1194 /* no slave has tmp_slave1's perm addr
1195 * as its curr addr
1196 */
1197 free_mac_slave = tmp_slave1;
1198 break;
1199 }
1200
1201 if (!has_bond_addr) {
1202 if (ether_addr_equal_64bits(tmp_slave1->dev->dev_addr,
1203 bond->dev->dev_addr)) {
1204
1205 has_bond_addr = tmp_slave1;
1206 }
1207 }
1208 }
1209
1210 if (free_mac_slave) {
1211 alb_set_slave_mac_addr(slave, free_mac_slave->perm_hwaddr,
1212 free_mac_slave->dev->addr_len);
1213
1214 slave_warn(bond->dev, slave->dev, "the slave hw address is in use by the bond; giving it the hw address of %s\n",
1215 free_mac_slave->dev->name);
1216
1217 } else if (has_bond_addr) {
1218 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");
1219 return -EFAULT;
1220 }
1221
1222 return 0;
1223}
1224
1225/**
1226 * alb_set_mac_address
1227 * @bond: bonding we're working on
1228 * @addr: MAC address to set
1229 *
1230 * In TLB mode all slaves are configured to the bond's hw address, but set
1231 * their dev_addr field to different addresses (based on their permanent hw
1232 * addresses).
1233 *
1234 * For each slave, this function sets the interface to the new address and then
1235 * changes its dev_addr field to its previous value.
1236 *
1237 * Unwinding assumes bond's mac address has not yet changed.
1238 */
1239static int alb_set_mac_address(struct bonding *bond, void *addr)
1240{
1241 struct slave *slave, *rollback_slave;
1242 struct list_head *iter;
1243 struct sockaddr_storage ss;
1244 char tmp_addr[MAX_ADDR_LEN];
1245 int res;
1246
1247 if (bond->alb_info.rlb_enabled)
1248 return 0;
1249
1250 bond_for_each_slave(bond, slave, iter) {
1251 /* save net_device's current hw address */
1252 bond_hw_addr_copy(tmp_addr, slave->dev->dev_addr,
1253 slave->dev->addr_len);
1254
1255 res = dev_set_mac_address(slave->dev, addr, NULL);
1256
1257 /* restore net_device's hw address */
1258 dev_addr_set(slave->dev, tmp_addr);
1259
1260 if (res)
1261 goto unwind;
1262 }
1263
1264 return 0;
1265
1266unwind:
1267 memcpy(ss.__data, bond->dev->dev_addr, bond->dev->addr_len);
1268 ss.ss_family = bond->dev->type;
1269
1270 /* unwind from head to the slave that failed */
1271 bond_for_each_slave(bond, rollback_slave, iter) {
1272 if (rollback_slave == slave)
1273 break;
1274 bond_hw_addr_copy(tmp_addr, rollback_slave->dev->dev_addr,
1275 rollback_slave->dev->addr_len);
1276 dev_set_mac_address(rollback_slave->dev,
1277 (struct sockaddr *)&ss, NULL);
1278 dev_addr_set(rollback_slave->dev, tmp_addr);
1279 }
1280
1281 return res;
1282}
1283
1284/* determine if the packet is NA or NS */
1285static bool alb_determine_nd(struct sk_buff *skb, struct bonding *bond)
1286{
1287 struct ipv6hdr *ip6hdr;
1288 struct icmp6hdr *hdr;
1289
1290 if (!pskb_network_may_pull(skb, sizeof(*ip6hdr)))
1291 return true;
1292
1293 ip6hdr = ipv6_hdr(skb);
1294 if (ip6hdr->nexthdr != IPPROTO_ICMPV6)
1295 return false;
1296
1297 if (!pskb_network_may_pull(skb, sizeof(*ip6hdr) + sizeof(*hdr)))
1298 return true;
1299
1300 hdr = icmp6_hdr(skb);
1301 return hdr->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT ||
1302 hdr->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION;
1303}
1304
1305/************************ exported alb functions ************************/
1306
1307int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1308{
1309 int res;
1310
1311 res = tlb_initialize(bond);
1312 if (res)
1313 return res;
1314
1315 if (rlb_enabled) {
1316 res = rlb_initialize(bond);
1317 if (res) {
1318 tlb_deinitialize(bond);
1319 return res;
1320 }
1321 bond->alb_info.rlb_enabled = 1;
1322 } else {
1323 bond->alb_info.rlb_enabled = 0;
1324 }
1325
1326 return 0;
1327}
1328
1329void bond_alb_deinitialize(struct bonding *bond)
1330{
1331 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1332
1333 tlb_deinitialize(bond);
1334
1335 if (bond_info->rlb_enabled)
1336 rlb_deinitialize(bond);
1337}
1338
1339static netdev_tx_t bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond,
1340 struct slave *tx_slave)
1341{
1342 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1343 struct ethhdr *eth_data = eth_hdr(skb);
1344
1345 if (!tx_slave) {
1346 /* unbalanced or unassigned, send through primary */
1347 tx_slave = rcu_dereference(bond->curr_active_slave);
1348 if (bond->params.tlb_dynamic_lb)
1349 bond_info->unbalanced_load += skb->len;
1350 }
1351
1352 if (tx_slave && bond_slave_can_tx(tx_slave)) {
1353 if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) {
1354 ether_addr_copy(eth_data->h_source,
1355 tx_slave->dev->dev_addr);
1356 }
1357
1358 return bond_dev_queue_xmit(bond, skb, tx_slave->dev);
1359 }
1360
1361 if (tx_slave && bond->params.tlb_dynamic_lb) {
1362 spin_lock(&bond->mode_lock);
1363 __tlb_clear_slave(bond, tx_slave, 0);
1364 spin_unlock(&bond->mode_lock);
1365 }
1366
1367 /* no suitable interface, frame not sent */
1368 return bond_tx_drop(bond->dev, skb);
1369}
1370
1371struct slave *bond_xmit_tlb_slave_get(struct bonding *bond,
1372 struct sk_buff *skb)
1373{
1374 struct slave *tx_slave = NULL;
1375 struct ethhdr *eth_data;
1376 u32 hash_index;
1377
1378 skb_reset_mac_header(skb);
1379 eth_data = eth_hdr(skb);
1380
1381 /* Do not TX balance any multicast or broadcast */
1382 if (!is_multicast_ether_addr(eth_data->h_dest)) {
1383 switch (skb->protocol) {
1384 case htons(ETH_P_IPV6):
1385 if (alb_determine_nd(skb, bond))
1386 break;
1387 fallthrough;
1388 case htons(ETH_P_IP):
1389 hash_index = bond_xmit_hash(bond, skb);
1390 if (bond->params.tlb_dynamic_lb) {
1391 tx_slave = tlb_choose_channel(bond,
1392 hash_index & 0xFF,
1393 skb->len);
1394 } else {
1395 struct bond_up_slave *slaves;
1396 unsigned int count;
1397
1398 slaves = rcu_dereference(bond->usable_slaves);
1399 count = slaves ? READ_ONCE(slaves->count) : 0;
1400 if (likely(count))
1401 tx_slave = slaves->arr[hash_index %
1402 count];
1403 }
1404 break;
1405 }
1406 }
1407 return tx_slave;
1408}
1409
1410netdev_tx_t bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1411{
1412 struct bonding *bond = netdev_priv(bond_dev);
1413 struct slave *tx_slave;
1414
1415 tx_slave = bond_xmit_tlb_slave_get(bond, skb);
1416 return bond_do_alb_xmit(skb, bond, tx_slave);
1417}
1418
1419struct slave *bond_xmit_alb_slave_get(struct bonding *bond,
1420 struct sk_buff *skb)
1421{
1422 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1423 static const __be32 ip_bcast = htonl(0xffffffff);
1424 struct slave *tx_slave = NULL;
1425 const u8 *hash_start = NULL;
1426 bool do_tx_balance = true;
1427 struct ethhdr *eth_data;
1428 u32 hash_index = 0;
1429 int hash_size = 0;
1430
1431 skb_reset_mac_header(skb);
1432 eth_data = eth_hdr(skb);
1433
1434 switch (ntohs(skb->protocol)) {
1435 case ETH_P_IP: {
1436 const struct iphdr *iph;
1437
1438 if (is_broadcast_ether_addr(eth_data->h_dest) ||
1439 !pskb_network_may_pull(skb, sizeof(*iph))) {
1440 do_tx_balance = false;
1441 break;
1442 }
1443 iph = ip_hdr(skb);
1444 if (iph->daddr == ip_bcast || iph->protocol == IPPROTO_IGMP) {
1445 do_tx_balance = false;
1446 break;
1447 }
1448 hash_start = (char *)&(iph->daddr);
1449 hash_size = sizeof(iph->daddr);
1450 break;
1451 }
1452 case ETH_P_IPV6: {
1453 const struct ipv6hdr *ip6hdr;
1454
1455 /* IPv6 doesn't really use broadcast mac address, but leave
1456 * that here just in case.
1457 */
1458 if (is_broadcast_ether_addr(eth_data->h_dest)) {
1459 do_tx_balance = false;
1460 break;
1461 }
1462
1463 /* IPv6 uses all-nodes multicast as an equivalent to
1464 * broadcasts in IPv4.
1465 */
1466 if (ether_addr_equal_64bits(eth_data->h_dest, mac_v6_allmcast)) {
1467 do_tx_balance = false;
1468 break;
1469 }
1470
1471 if (alb_determine_nd(skb, bond)) {
1472 do_tx_balance = false;
1473 break;
1474 }
1475
1476 /* The IPv6 header is pulled by alb_determine_nd */
1477 /* Additionally, DAD probes should not be tx-balanced as that
1478 * will lead to false positives for duplicate addresses and
1479 * prevent address configuration from working.
1480 */
1481 ip6hdr = ipv6_hdr(skb);
1482 if (ipv6_addr_any(&ip6hdr->saddr)) {
1483 do_tx_balance = false;
1484 break;
1485 }
1486
1487 hash_start = (char *)&ip6hdr->daddr;
1488 hash_size = sizeof(ip6hdr->daddr);
1489 break;
1490 }
1491 case ETH_P_ARP:
1492 do_tx_balance = false;
1493 if (bond_info->rlb_enabled)
1494 tx_slave = rlb_arp_xmit(skb, bond);
1495 break;
1496 default:
1497 do_tx_balance = false;
1498 break;
1499 }
1500
1501 if (do_tx_balance) {
1502 if (bond->params.tlb_dynamic_lb) {
1503 hash_index = _simple_hash(hash_start, hash_size);
1504 tx_slave = tlb_choose_channel(bond, hash_index, skb->len);
1505 } else {
1506 /*
1507 * do_tx_balance means we are free to select the tx_slave
1508 * So we do exactly what tlb would do for hash selection
1509 */
1510
1511 struct bond_up_slave *slaves;
1512 unsigned int count;
1513
1514 slaves = rcu_dereference(bond->usable_slaves);
1515 count = slaves ? READ_ONCE(slaves->count) : 0;
1516 if (likely(count))
1517 tx_slave = slaves->arr[bond_xmit_hash(bond, skb) %
1518 count];
1519 }
1520 }
1521 return tx_slave;
1522}
1523
1524netdev_tx_t bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1525{
1526 struct bonding *bond = netdev_priv(bond_dev);
1527 struct slave *tx_slave = NULL;
1528
1529 tx_slave = bond_xmit_alb_slave_get(bond, skb);
1530 return bond_do_alb_xmit(skb, bond, tx_slave);
1531}
1532
1533void bond_alb_monitor(struct work_struct *work)
1534{
1535 struct bonding *bond = container_of(work, struct bonding,
1536 alb_work.work);
1537 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1538 struct list_head *iter;
1539 struct slave *slave;
1540
1541 if (!bond_has_slaves(bond)) {
1542 atomic_set(&bond_info->tx_rebalance_counter, 0);
1543 bond_info->lp_counter = 0;
1544 goto re_arm;
1545 }
1546
1547 rcu_read_lock();
1548
1549 atomic_inc(&bond_info->tx_rebalance_counter);
1550 bond_info->lp_counter++;
1551
1552 /* send learning packets */
1553 if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) {
1554 bool strict_match;
1555
1556 bond_for_each_slave_rcu(bond, slave, iter) {
1557 /* If updating current_active, use all currently
1558 * user mac addresses (!strict_match). Otherwise, only
1559 * use mac of the slave device.
1560 * In RLB mode, we always use strict matches.
1561 */
1562 strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) ||
1563 bond_info->rlb_enabled);
1564 alb_send_learning_packets(slave, slave->dev->dev_addr,
1565 strict_match);
1566 }
1567 bond_info->lp_counter = 0;
1568 }
1569
1570 /* rebalance tx traffic */
1571 if (atomic_read(&bond_info->tx_rebalance_counter) >= BOND_TLB_REBALANCE_TICKS) {
1572 bond_for_each_slave_rcu(bond, slave, iter) {
1573 tlb_clear_slave(bond, slave, 1);
1574 if (slave == rcu_access_pointer(bond->curr_active_slave)) {
1575 SLAVE_TLB_INFO(slave).load =
1576 bond_info->unbalanced_load /
1577 BOND_TLB_REBALANCE_INTERVAL;
1578 bond_info->unbalanced_load = 0;
1579 }
1580 }
1581 atomic_set(&bond_info->tx_rebalance_counter, 0);
1582 }
1583
1584 if (bond_info->rlb_enabled) {
1585 if (bond_info->primary_is_promisc &&
1586 (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1587
1588 /* dev_set_promiscuity requires rtnl and
1589 * nothing else. Avoid race with bond_close.
1590 */
1591 rcu_read_unlock();
1592 if (!rtnl_trylock())
1593 goto re_arm;
1594
1595 bond_info->rlb_promisc_timeout_counter = 0;
1596
1597 /* If the primary was set to promiscuous mode
1598 * because a slave was disabled then
1599 * it can now leave promiscuous mode.
1600 */
1601 dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev,
1602 -1);
1603 bond_info->primary_is_promisc = 0;
1604
1605 rtnl_unlock();
1606 rcu_read_lock();
1607 }
1608
1609 if (bond_info->rlb_rebalance) {
1610 bond_info->rlb_rebalance = 0;
1611 rlb_rebalance(bond);
1612 }
1613
1614 /* check if clients need updating */
1615 if (bond_info->rx_ntt) {
1616 if (bond_info->rlb_update_delay_counter) {
1617 --bond_info->rlb_update_delay_counter;
1618 } else {
1619 rlb_update_rx_clients(bond);
1620 if (bond_info->rlb_update_retry_counter)
1621 --bond_info->rlb_update_retry_counter;
1622 else
1623 bond_info->rx_ntt = 0;
1624 }
1625 }
1626 }
1627 rcu_read_unlock();
1628re_arm:
1629 queue_delayed_work(bond->wq, &bond->alb_work, alb_delta_in_ticks);
1630}
1631
1632/* assumption: called before the slave is attached to the bond
1633 * and not locked by the bond lock
1634 */
1635int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1636{
1637 int res;
1638
1639 res = alb_set_slave_mac_addr(slave, slave->perm_hwaddr,
1640 slave->dev->addr_len);
1641 if (res)
1642 return res;
1643
1644 res = alb_handle_addr_collision_on_attach(bond, slave);
1645 if (res)
1646 return res;
1647
1648 tlb_init_slave(slave);
1649
1650 /* order a rebalance ASAP */
1651 atomic_set(&bond->alb_info.tx_rebalance_counter,
1652 BOND_TLB_REBALANCE_TICKS);
1653
1654 if (bond->alb_info.rlb_enabled)
1655 bond->alb_info.rlb_rebalance = 1;
1656
1657 return 0;
1658}
1659
1660/* Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1661 * if necessary.
1662 *
1663 * Caller must hold RTNL and no other locks
1664 */
1665void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1666{
1667 if (bond_has_slaves(bond))
1668 alb_change_hw_addr_on_detach(bond, slave);
1669
1670 tlb_clear_slave(bond, slave, 0);
1671
1672 if (bond->alb_info.rlb_enabled) {
1673 bond->alb_info.rx_slave = NULL;
1674 rlb_clear_slave(bond, slave);
1675 }
1676
1677}
1678
1679void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1680{
1681 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1682
1683 if (link == BOND_LINK_DOWN) {
1684 tlb_clear_slave(bond, slave, 0);
1685 if (bond->alb_info.rlb_enabled)
1686 rlb_clear_slave(bond, slave);
1687 } else if (link == BOND_LINK_UP) {
1688 /* order a rebalance ASAP */
1689 atomic_set(&bond_info->tx_rebalance_counter,
1690 BOND_TLB_REBALANCE_TICKS);
1691 if (bond->alb_info.rlb_enabled) {
1692 bond->alb_info.rlb_rebalance = 1;
1693 /* If the updelay module parameter is smaller than the
1694 * forwarding delay of the switch the rebalance will
1695 * not work because the rebalance arp replies will
1696 * not be forwarded to the clients..
1697 */
1698 }
1699 }
1700
1701 if (bond_is_nondyn_tlb(bond)) {
1702 if (bond_update_slave_arr(bond, NULL))
1703 pr_err("Failed to build slave-array for TLB mode.\n");
1704 }
1705}
1706
1707/**
1708 * bond_alb_handle_active_change - assign new curr_active_slave
1709 * @bond: our bonding struct
1710 * @new_slave: new slave to assign
1711 *
1712 * Set the bond->curr_active_slave to @new_slave and handle
1713 * mac address swapping and promiscuity changes as needed.
1714 *
1715 * Caller must hold RTNL
1716 */
1717void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1718{
1719 struct slave *swap_slave;
1720 struct slave *curr_active;
1721
1722 curr_active = rtnl_dereference(bond->curr_active_slave);
1723 if (curr_active == new_slave)
1724 return;
1725
1726 if (curr_active && bond->alb_info.primary_is_promisc) {
1727 dev_set_promiscuity(curr_active->dev, -1);
1728 bond->alb_info.primary_is_promisc = 0;
1729 bond->alb_info.rlb_promisc_timeout_counter = 0;
1730 }
1731
1732 swap_slave = curr_active;
1733 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1734
1735 if (!new_slave || !bond_has_slaves(bond))
1736 return;
1737
1738 /* set the new curr_active_slave to the bonds mac address
1739 * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1740 */
1741 if (!swap_slave)
1742 swap_slave = bond_slave_has_mac(bond, bond->dev->dev_addr);
1743
1744 /* Arrange for swap_slave and new_slave to temporarily be
1745 * ignored so we can mess with their MAC addresses without
1746 * fear of interference from transmit activity.
1747 */
1748 if (swap_slave)
1749 tlb_clear_slave(bond, swap_slave, 1);
1750 tlb_clear_slave(bond, new_slave, 1);
1751
1752 /* in TLB mode, the slave might flip down/up with the old dev_addr,
1753 * and thus filter bond->dev_addr's packets, so force bond's mac
1754 */
1755 if (BOND_MODE(bond) == BOND_MODE_TLB) {
1756 struct sockaddr_storage ss;
1757 u8 tmp_addr[MAX_ADDR_LEN];
1758
1759 bond_hw_addr_copy(tmp_addr, new_slave->dev->dev_addr,
1760 new_slave->dev->addr_len);
1761
1762 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
1763 bond->dev->addr_len);
1764 ss.ss_family = bond->dev->type;
1765 /* we don't care if it can't change its mac, best effort */
1766 dev_set_mac_address(new_slave->dev, (struct sockaddr *)&ss,
1767 NULL);
1768
1769 dev_addr_set(new_slave->dev, tmp_addr);
1770 }
1771
1772 /* curr_active_slave must be set before calling alb_swap_mac_addr */
1773 if (swap_slave) {
1774 /* swap mac address */
1775 alb_swap_mac_addr(swap_slave, new_slave);
1776 alb_fasten_mac_swap(bond, swap_slave, new_slave);
1777 } else {
1778 /* set the new_slave to the bond mac address */
1779 alb_set_slave_mac_addr(new_slave, bond->dev->dev_addr,
1780 bond->dev->addr_len);
1781 alb_send_learning_packets(new_slave, bond->dev->dev_addr,
1782 false);
1783 }
1784}
1785
1786/* Called with RTNL */
1787int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1788{
1789 struct bonding *bond = netdev_priv(bond_dev);
1790 struct sockaddr_storage *ss = addr;
1791 struct slave *curr_active;
1792 struct slave *swap_slave;
1793 int res;
1794
1795 if (!is_valid_ether_addr(ss->__data))
1796 return -EADDRNOTAVAIL;
1797
1798 res = alb_set_mac_address(bond, addr);
1799 if (res)
1800 return res;
1801
1802 dev_addr_set(bond_dev, ss->__data);
1803
1804 /* If there is no curr_active_slave there is nothing else to do.
1805 * Otherwise we'll need to pass the new address to it and handle
1806 * duplications.
1807 */
1808 curr_active = rtnl_dereference(bond->curr_active_slave);
1809 if (!curr_active)
1810 return 0;
1811
1812 swap_slave = bond_slave_has_mac(bond, bond_dev->dev_addr);
1813
1814 if (swap_slave) {
1815 alb_swap_mac_addr(swap_slave, curr_active);
1816 alb_fasten_mac_swap(bond, swap_slave, curr_active);
1817 } else {
1818 alb_set_slave_mac_addr(curr_active, bond_dev->dev_addr,
1819 bond_dev->addr_len);
1820
1821 alb_send_learning_packets(curr_active,
1822 bond_dev->dev_addr, false);
1823 if (bond->alb_info.rlb_enabled) {
1824 /* inform clients mac address has changed */
1825 rlb_req_update_slave_clients(bond, curr_active);
1826 }
1827 }
1828
1829 return 0;
1830}
1831
1832void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1833{
1834 if (bond->alb_info.rlb_enabled)
1835 rlb_clear_vlan(bond, vlan_id);
1836}
1837
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