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(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(lock: &bond->mode_lock);
120 __tlb_clear_slave(bond, slave, save_load);
121 spin_unlock_bh(lock: &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(lock: &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(entry: &bond_info->tx_hashtbl[i], save_load: 0);
142
143 spin_unlock_bh(lock: &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(lock: &bond->mode_lock);
154
155 kfree(objp: bond_info->tx_hashtbl);
156 bond_info->tx_hashtbl = NULL;
157
158 spin_unlock_bh(lock: &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(lock: &bond->mode_lock);
237 tx_slave = __tlb_choose_channel(bond, hash_index, skb_len);
238 spin_unlock(lock: &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(lock: &bond->mode_lock);
255
256 hash_index = _simple_hash(hash_start: (u8 *)&(arp->ip_src), hash_size: 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(addr1: client_info->mac_dst, addr2: arp->mac_src))) {
263 /* update the clients MAC address */
264 ether_addr_copy(dst: client_info->mac_dst, src: arp->mac_src);
265 client_info->ntt = 1;
266 bond_info->rx_ntt = 1;
267 }
268
269 spin_unlock_bh(lock: &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, offset: 0, len: sizeof(_arp), buffer: &_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(dev: curr_active->dev, inc: 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(slave: curr_active, mac_addr: addr, strict_match: 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(lock: &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(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(lock: &bond->mode_lock);
419
420 if (slave != rtnl_dereference(bond->curr_active_slave))
421 rlb_teach_disabled_mac_on_primary(bond, addr: 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(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 dest_ip: client_info->ip_dst,
436 dev: client_info->slave->dev,
437 src_ip: client_info->ip_src,
438 dest_hw: client_info->mac_dst,
439 src_hw: client_info->slave->dev->dev_addr,
440 target_hw: 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 vlan_tci: 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(lock: &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(lock: &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(lock: &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(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(lock: &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(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(dev: bond->dev, format: "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(addr1: client_info->slave->dev->dev_addr,
543 addr2: bond->dev->dev_addr) &&
544 is_valid_ether_addr(addr: client_info->mac_dst)) {
545 client_info->ntt = 1;
546 bond_info->rx_ntt = 1;
547 }
548 }
549
550 spin_unlock(lock: &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(lock: &bond->mode_lock);
563
564 curr_active_slave = rcu_dereference(bond->curr_active_slave);
565
566 hash_index = _simple_hash(hash_start: (u8 *)&arp->ip_dst, hash_size: 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(addr: arp->mac_dst)) {
574 /* update mac address from arp */
575 ether_addr_copy(dst: client_info->mac_dst, src: arp->mac_dst);
576 }
577 ether_addr_copy(dst: client_info->mac_src, src: arp->mac_src);
578
579 assigned_slave = client_info->slave;
580 if (assigned_slave) {
581 spin_unlock(lock: &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(hash_start: (u8 *)&arp->ip_src,
606 hash_size: sizeof(arp->ip_src));
607 rlb_src_unlink(bond, index: hash_index);
608 rlb_src_link(bond, ip_src_hash: hash_src, ip_dst_hash: 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(dst: client_info->mac_dst, src: arp->mac_dst);
618 ether_addr_copy(dst: client_info->mac_src, src: arp->mac_src);
619 client_info->slave = assigned_slave;
620
621 if (is_valid_ether_addr(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, vlan_tci: &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(lock: &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, len: 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, mac: arp->mac_src))
667 return NULL;
668
669 dev = ip_dev_find(net: dev_net(dev: bond->dev), addr: 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(dst: arp->mac_src, src: tx_slave->dev->dev_addr,
683 len: 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, src_ip: 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(lock: &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(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(lock: &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(hash_start: (u8 *)&(arp->ip_src), hash_size: sizeof(arp->ip_src));
838 u32 index;
839
840 spin_lock_bh(lock: &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(addr1: arp->mac_src, addr2: entry->mac_src))
849 rlb_delete_table_entry(bond, index);
850 index = next_index;
851 }
852 spin_unlock_bh(lock: &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(lock: &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(entry: bond_info->rx_hashtbl + i);
874
875 spin_unlock_bh(lock: &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(lock: &bond->mode_lock);
888
889 kfree(objp: 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(lock: &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(lock: &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, index: curr_index);
910
911 curr_index = next_index;
912 }
913
914 spin_unlock_bh(lock: &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(dst: pkt.mac_dst, src: mac_addr);
928 ether_addr_copy(dst: pkt.mac_src, src: mac_addr);
929 pkt.type = cpu_to_be16(ETH_P_LOOPBACK);
930
931 skb = dev_alloc_skb(length: size);
932 if (!skb)
933 return;
934
935 skb_put_data(skb, data: &pkt, len: 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, vlan_tci: 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(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_proto: vlan_dev_vlan_proto(dev: upper),
974 vid: vlan_dev_vlan_id(dev: upper));
975 } else {
976 alb_send_lp_vid(slave, mac_addr: upper->dev_addr,
977 vlan_proto: vlan_dev_vlan_proto(dev: upper),
978 vid: vlan_dev_vlan_id(dev: 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(dev: upper) && !strict_match) {
986 tags = bond_verify_device_path(start_dev: bond->dev, end_dev: upper, level: 0);
987 if (IS_ERR_OR_NULL(ptr: tags))
988 BUG();
989 alb_send_lp_vid(slave, mac_addr: upper->dev_addr,
990 vlan_proto: tags[0].vlan_proto, vid: tags[0].vlan_id);
991 kfree(objp: tags);
992 }
993
994 return 0;
995}
996
997static void alb_send_learning_packets(struct slave *slave, const u8 mac_addr[],
998 bool strict_match)
999{
1000 struct bonding *bond = bond_get_bond_by_slave(slave);
1001 struct netdev_nested_priv priv;
1002 struct alb_walk_data data = {
1003 .strict_match = strict_match,
1004 .mac_addr = mac_addr,
1005 .slave = slave,
1006 .bond = bond,
1007 };
1008
1009 priv.data = (void *)&data;
1010 /* send untagged */
1011 alb_send_lp_vid(slave, mac_addr, vlan_proto: 0, vid: 0);
1012
1013 /* loop through all devices and see if we need to send a packet
1014 * for that device.
1015 */
1016 rcu_read_lock();
1017 netdev_walk_all_upper_dev_rcu(dev: bond->dev, fn: alb_upper_dev_walk, priv: &priv);
1018 rcu_read_unlock();
1019}
1020
1021static int alb_set_slave_mac_addr(struct slave *slave, const u8 addr[],
1022 unsigned int len)
1023{
1024 struct net_device *dev = slave->dev;
1025 struct sockaddr_storage ss;
1026
1027 if (BOND_MODE(slave->bond) == BOND_MODE_TLB) {
1028 __dev_addr_set(dev, addr, len);
1029 return 0;
1030 }
1031
1032 /* for rlb each slave must have a unique hw mac addresses so that
1033 * each slave will receive packets destined to a different mac
1034 */
1035 memcpy(ss.__data, addr, len);
1036 ss.ss_family = dev->type;
1037 if (dev_set_mac_address(dev, sa: (struct sockaddr *)&ss, NULL)) {
1038 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");
1039 return -EOPNOTSUPP;
1040 }
1041 return 0;
1042}
1043
1044/* Swap MAC addresses between two slaves.
1045 *
1046 * Called with RTNL held, and no other locks.
1047 */
1048static void alb_swap_mac_addr(struct slave *slave1, struct slave *slave2)
1049{
1050 u8 tmp_mac_addr[MAX_ADDR_LEN];
1051
1052 bond_hw_addr_copy(dst: tmp_mac_addr, src: slave1->dev->dev_addr,
1053 len: slave1->dev->addr_len);
1054 alb_set_slave_mac_addr(slave: slave1, addr: slave2->dev->dev_addr,
1055 len: slave2->dev->addr_len);
1056 alb_set_slave_mac_addr(slave: slave2, addr: tmp_mac_addr,
1057 len: slave1->dev->addr_len);
1058
1059}
1060
1061/* Send learning packets after MAC address swap.
1062 *
1063 * Called with RTNL and no other locks
1064 */
1065static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
1066 struct slave *slave2)
1067{
1068 int slaves_state_differ = (bond_slave_can_tx(slave: slave1) != bond_slave_can_tx(slave: slave2));
1069 struct slave *disabled_slave = NULL;
1070
1071 ASSERT_RTNL();
1072
1073 /* fasten the change in the switch */
1074 if (bond_slave_can_tx(slave: slave1)) {
1075 alb_send_learning_packets(slave: slave1, mac_addr: slave1->dev->dev_addr, strict_match: false);
1076 if (bond->alb_info.rlb_enabled) {
1077 /* inform the clients that the mac address
1078 * has changed
1079 */
1080 rlb_req_update_slave_clients(bond, slave: slave1);
1081 }
1082 } else {
1083 disabled_slave = slave1;
1084 }
1085
1086 if (bond_slave_can_tx(slave: slave2)) {
1087 alb_send_learning_packets(slave: slave2, mac_addr: slave2->dev->dev_addr, strict_match: false);
1088 if (bond->alb_info.rlb_enabled) {
1089 /* inform the clients that the mac address
1090 * has changed
1091 */
1092 rlb_req_update_slave_clients(bond, slave: slave2);
1093 }
1094 } else {
1095 disabled_slave = slave2;
1096 }
1097
1098 if (bond->alb_info.rlb_enabled && slaves_state_differ) {
1099 /* A disabled slave was assigned an active mac addr */
1100 rlb_teach_disabled_mac_on_primary(bond,
1101 addr: disabled_slave->dev->dev_addr);
1102 }
1103}
1104
1105/**
1106 * alb_change_hw_addr_on_detach
1107 * @bond: bonding we're working on
1108 * @slave: the slave that was just detached
1109 *
1110 * We assume that @slave was already detached from the slave list.
1111 *
1112 * If @slave's permanent hw address is different both from its current
1113 * address and from @bond's address, then somewhere in the bond there's
1114 * a slave that has @slave's permanet address as its current address.
1115 * We'll make sure that slave no longer uses @slave's permanent address.
1116 *
1117 * Caller must hold RTNL and no other locks
1118 */
1119static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
1120{
1121 int perm_curr_diff;
1122 int perm_bond_diff;
1123 struct slave *found_slave;
1124
1125 perm_curr_diff = !ether_addr_equal_64bits(addr1: slave->perm_hwaddr,
1126 addr2: slave->dev->dev_addr);
1127 perm_bond_diff = !ether_addr_equal_64bits(addr1: slave->perm_hwaddr,
1128 addr2: bond->dev->dev_addr);
1129
1130 if (perm_curr_diff && perm_bond_diff) {
1131 found_slave = bond_slave_has_mac(bond, mac: slave->perm_hwaddr);
1132
1133 if (found_slave) {
1134 alb_swap_mac_addr(slave1: slave, slave2: found_slave);
1135 alb_fasten_mac_swap(bond, slave1: slave, slave2: found_slave);
1136 }
1137 }
1138}
1139
1140/**
1141 * alb_handle_addr_collision_on_attach
1142 * @bond: bonding we're working on
1143 * @slave: the slave that was just attached
1144 *
1145 * checks uniqueness of slave's mac address and handles the case the
1146 * new slave uses the bonds mac address.
1147 *
1148 * If the permanent hw address of @slave is @bond's hw address, we need to
1149 * find a different hw address to give @slave, that isn't in use by any other
1150 * slave in the bond. This address must be, of course, one of the permanent
1151 * addresses of the other slaves.
1152 *
1153 * We go over the slave list, and for each slave there we compare its
1154 * permanent hw address with the current address of all the other slaves.
1155 * If no match was found, then we've found a slave with a permanent address
1156 * that isn't used by any other slave in the bond, so we can assign it to
1157 * @slave.
1158 *
1159 * assumption: this function is called before @slave is attached to the
1160 * bond slave list.
1161 */
1162static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slave *slave)
1163{
1164 struct slave *has_bond_addr = rcu_access_pointer(bond->curr_active_slave);
1165 struct slave *tmp_slave1, *free_mac_slave = NULL;
1166 struct list_head *iter;
1167
1168 if (!bond_has_slaves(bond)) {
1169 /* this is the first slave */
1170 return 0;
1171 }
1172
1173 /* if slave's mac address differs from bond's mac address
1174 * check uniqueness of slave's mac address against the other
1175 * slaves in the bond.
1176 */
1177 if (!ether_addr_equal_64bits(addr1: slave->perm_hwaddr, addr2: bond->dev->dev_addr)) {
1178 if (!bond_slave_has_mac(bond, mac: slave->dev->dev_addr))
1179 return 0;
1180
1181 /* Try setting slave mac to bond address and fall-through
1182 * to code handling that situation below...
1183 */
1184 alb_set_slave_mac_addr(slave, addr: bond->dev->dev_addr,
1185 len: bond->dev->addr_len);
1186 }
1187
1188 /* The slave's address is equal to the address of the bond.
1189 * Search for a spare address in the bond for this slave.
1190 */
1191 bond_for_each_slave(bond, tmp_slave1, iter) {
1192 if (!bond_slave_has_mac(bond, mac: tmp_slave1->perm_hwaddr)) {
1193 /* no slave has tmp_slave1's perm addr
1194 * as its curr addr
1195 */
1196 free_mac_slave = tmp_slave1;
1197 break;
1198 }
1199
1200 if (!has_bond_addr) {
1201 if (ether_addr_equal_64bits(addr1: tmp_slave1->dev->dev_addr,
1202 addr2: bond->dev->dev_addr)) {
1203
1204 has_bond_addr = tmp_slave1;
1205 }
1206 }
1207 }
1208
1209 if (free_mac_slave) {
1210 alb_set_slave_mac_addr(slave, addr: free_mac_slave->perm_hwaddr,
1211 len: free_mac_slave->dev->addr_len);
1212
1213 slave_warn(bond->dev, slave->dev, "the slave hw address is in use by the bond; giving it the hw address of %s\n",
1214 free_mac_slave->dev->name);
1215
1216 } else if (has_bond_addr) {
1217 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");
1218 return -EFAULT;
1219 }
1220
1221 return 0;
1222}
1223
1224/**
1225 * alb_set_mac_address
1226 * @bond: bonding we're working on
1227 * @addr: MAC address to set
1228 *
1229 * In TLB mode all slaves are configured to the bond's hw address, but set
1230 * their dev_addr field to different addresses (based on their permanent hw
1231 * addresses).
1232 *
1233 * For each slave, this function sets the interface to the new address and then
1234 * changes its dev_addr field to its previous value.
1235 *
1236 * Unwinding assumes bond's mac address has not yet changed.
1237 */
1238static int alb_set_mac_address(struct bonding *bond, void *addr)
1239{
1240 struct slave *slave, *rollback_slave;
1241 struct list_head *iter;
1242 struct sockaddr_storage ss;
1243 char tmp_addr[MAX_ADDR_LEN];
1244 int res;
1245
1246 if (bond->alb_info.rlb_enabled)
1247 return 0;
1248
1249 bond_for_each_slave(bond, slave, iter) {
1250 /* save net_device's current hw address */
1251 bond_hw_addr_copy(dst: tmp_addr, src: slave->dev->dev_addr,
1252 len: slave->dev->addr_len);
1253
1254 res = dev_set_mac_address(dev: slave->dev, sa: addr, NULL);
1255
1256 /* restore net_device's hw address */
1257 dev_addr_set(dev: slave->dev, addr: tmp_addr);
1258
1259 if (res)
1260 goto unwind;
1261 }
1262
1263 return 0;
1264
1265unwind:
1266 memcpy(ss.__data, bond->dev->dev_addr, bond->dev->addr_len);
1267 ss.ss_family = bond->dev->type;
1268
1269 /* unwind from head to the slave that failed */
1270 bond_for_each_slave(bond, rollback_slave, iter) {
1271 if (rollback_slave == slave)
1272 break;
1273 bond_hw_addr_copy(dst: tmp_addr, src: rollback_slave->dev->dev_addr,
1274 len: rollback_slave->dev->addr_len);
1275 dev_set_mac_address(dev: rollback_slave->dev,
1276 sa: (struct sockaddr *)&ss, NULL);
1277 dev_addr_set(dev: rollback_slave->dev, addr: tmp_addr);
1278 }
1279
1280 return res;
1281}
1282
1283/* determine if the packet is NA or NS */
1284static bool alb_determine_nd(struct sk_buff *skb, struct bonding *bond)
1285{
1286 struct ipv6hdr *ip6hdr;
1287 struct icmp6hdr *hdr;
1288
1289 if (!pskb_network_may_pull(skb, len: sizeof(*ip6hdr)))
1290 return true;
1291
1292 ip6hdr = ipv6_hdr(skb);
1293 if (ip6hdr->nexthdr != IPPROTO_ICMPV6)
1294 return false;
1295
1296 if (!pskb_network_may_pull(skb, len: sizeof(*ip6hdr) + sizeof(*hdr)))
1297 return true;
1298
1299 hdr = icmp6_hdr(skb);
1300 return hdr->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT ||
1301 hdr->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION;
1302}
1303
1304/************************ exported alb functions ************************/
1305
1306int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
1307{
1308 int res;
1309
1310 res = tlb_initialize(bond);
1311 if (res)
1312 return res;
1313
1314 if (rlb_enabled) {
1315 res = rlb_initialize(bond);
1316 if (res) {
1317 tlb_deinitialize(bond);
1318 return res;
1319 }
1320 bond->alb_info.rlb_enabled = 1;
1321 } else {
1322 bond->alb_info.rlb_enabled = 0;
1323 }
1324
1325 return 0;
1326}
1327
1328void bond_alb_deinitialize(struct bonding *bond)
1329{
1330 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1331
1332 tlb_deinitialize(bond);
1333
1334 if (bond_info->rlb_enabled)
1335 rlb_deinitialize(bond);
1336}
1337
1338static netdev_tx_t bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond,
1339 struct slave *tx_slave)
1340{
1341 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1342 struct ethhdr *eth_data = eth_hdr(skb);
1343
1344 if (!tx_slave) {
1345 /* unbalanced or unassigned, send through primary */
1346 tx_slave = rcu_dereference(bond->curr_active_slave);
1347 if (bond->params.tlb_dynamic_lb)
1348 bond_info->unbalanced_load += skb->len;
1349 }
1350
1351 if (tx_slave && bond_slave_can_tx(slave: tx_slave)) {
1352 if (tx_slave != rcu_access_pointer(bond->curr_active_slave)) {
1353 ether_addr_copy(dst: eth_data->h_source,
1354 src: tx_slave->dev->dev_addr);
1355 }
1356
1357 return bond_dev_queue_xmit(bond, skb, slave_dev: tx_slave->dev);
1358 }
1359
1360 if (tx_slave && bond->params.tlb_dynamic_lb) {
1361 spin_lock(lock: &bond->mode_lock);
1362 __tlb_clear_slave(bond, slave: tx_slave, save_load: 0);
1363 spin_unlock(lock: &bond->mode_lock);
1364 }
1365
1366 /* no suitable interface, frame not sent */
1367 return bond_tx_drop(dev: bond->dev, skb);
1368}
1369
1370struct slave *bond_xmit_tlb_slave_get(struct bonding *bond,
1371 struct sk_buff *skb)
1372{
1373 struct slave *tx_slave = NULL;
1374 struct ethhdr *eth_data;
1375 u32 hash_index;
1376
1377 skb_reset_mac_header(skb);
1378 eth_data = eth_hdr(skb);
1379
1380 /* Do not TX balance any multicast or broadcast */
1381 if (!is_multicast_ether_addr(addr: eth_data->h_dest)) {
1382 switch (skb->protocol) {
1383 case htons(ETH_P_IPV6):
1384 if (alb_determine_nd(skb, bond))
1385 break;
1386 fallthrough;
1387 case htons(ETH_P_IP):
1388 hash_index = bond_xmit_hash(bond, skb);
1389 if (bond->params.tlb_dynamic_lb) {
1390 tx_slave = tlb_choose_channel(bond,
1391 hash_index: hash_index & 0xFF,
1392 skb_len: skb->len);
1393 } else {
1394 struct bond_up_slave *slaves;
1395 unsigned int count;
1396
1397 slaves = rcu_dereference(bond->usable_slaves);
1398 count = slaves ? READ_ONCE(slaves->count) : 0;
1399 if (likely(count))
1400 tx_slave = slaves->arr[hash_index %
1401 count];
1402 }
1403 break;
1404 }
1405 }
1406 return tx_slave;
1407}
1408
1409netdev_tx_t bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1410{
1411 struct bonding *bond = netdev_priv(dev: bond_dev);
1412 struct slave *tx_slave;
1413
1414 tx_slave = bond_xmit_tlb_slave_get(bond, skb);
1415 return bond_do_alb_xmit(skb, bond, tx_slave);
1416}
1417
1418struct slave *bond_xmit_alb_slave_get(struct bonding *bond,
1419 struct sk_buff *skb)
1420{
1421 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1422 static const __be32 ip_bcast = htonl(0xffffffff);
1423 struct slave *tx_slave = NULL;
1424 const u8 *hash_start = NULL;
1425 bool do_tx_balance = true;
1426 struct ethhdr *eth_data;
1427 u32 hash_index = 0;
1428 int hash_size = 0;
1429
1430 skb_reset_mac_header(skb);
1431 eth_data = eth_hdr(skb);
1432
1433 switch (ntohs(skb->protocol)) {
1434 case ETH_P_IP: {
1435 const struct iphdr *iph;
1436
1437 if (is_broadcast_ether_addr(addr: eth_data->h_dest) ||
1438 !pskb_network_may_pull(skb, len: sizeof(*iph))) {
1439 do_tx_balance = false;
1440 break;
1441 }
1442 iph = ip_hdr(skb);
1443 if (iph->daddr == ip_bcast || iph->protocol == IPPROTO_IGMP) {
1444 do_tx_balance = false;
1445 break;
1446 }
1447 hash_start = (char *)&(iph->daddr);
1448 hash_size = sizeof(iph->daddr);
1449 break;
1450 }
1451 case ETH_P_IPV6: {
1452 const struct ipv6hdr *ip6hdr;
1453
1454 /* IPv6 doesn't really use broadcast mac address, but leave
1455 * that here just in case.
1456 */
1457 if (is_broadcast_ether_addr(addr: eth_data->h_dest)) {
1458 do_tx_balance = false;
1459 break;
1460 }
1461
1462 /* IPv6 uses all-nodes multicast as an equivalent to
1463 * broadcasts in IPv4.
1464 */
1465 if (ether_addr_equal_64bits(addr1: eth_data->h_dest, addr2: mac_v6_allmcast)) {
1466 do_tx_balance = false;
1467 break;
1468 }
1469
1470 if (alb_determine_nd(skb, bond)) {
1471 do_tx_balance = false;
1472 break;
1473 }
1474
1475 /* The IPv6 header is pulled by alb_determine_nd */
1476 /* Additionally, DAD probes should not be tx-balanced as that
1477 * will lead to false positives for duplicate addresses and
1478 * prevent address configuration from working.
1479 */
1480 ip6hdr = ipv6_hdr(skb);
1481 if (ipv6_addr_any(a: &ip6hdr->saddr)) {
1482 do_tx_balance = false;
1483 break;
1484 }
1485
1486 hash_start = (char *)&ip6hdr->daddr;
1487 hash_size = sizeof(ip6hdr->daddr);
1488 break;
1489 }
1490 case ETH_P_ARP:
1491 do_tx_balance = false;
1492 if (bond_info->rlb_enabled)
1493 tx_slave = rlb_arp_xmit(skb, bond);
1494 break;
1495 default:
1496 do_tx_balance = false;
1497 break;
1498 }
1499
1500 if (do_tx_balance) {
1501 if (bond->params.tlb_dynamic_lb) {
1502 hash_index = _simple_hash(hash_start, hash_size);
1503 tx_slave = tlb_choose_channel(bond, hash_index, skb_len: skb->len);
1504 } else {
1505 /*
1506 * do_tx_balance means we are free to select the tx_slave
1507 * So we do exactly what tlb would do for hash selection
1508 */
1509
1510 struct bond_up_slave *slaves;
1511 unsigned int count;
1512
1513 slaves = rcu_dereference(bond->usable_slaves);
1514 count = slaves ? READ_ONCE(slaves->count) : 0;
1515 if (likely(count))
1516 tx_slave = slaves->arr[bond_xmit_hash(bond, skb) %
1517 count];
1518 }
1519 }
1520 return tx_slave;
1521}
1522
1523netdev_tx_t bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
1524{
1525 struct bonding *bond = netdev_priv(dev: bond_dev);
1526 struct slave *tx_slave = NULL;
1527
1528 tx_slave = bond_xmit_alb_slave_get(bond, skb);
1529 return bond_do_alb_xmit(skb, bond, tx_slave);
1530}
1531
1532void bond_alb_monitor(struct work_struct *work)
1533{
1534 struct bonding *bond = container_of(work, struct bonding,
1535 alb_work.work);
1536 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1537 struct list_head *iter;
1538 struct slave *slave;
1539
1540 if (!bond_has_slaves(bond)) {
1541 atomic_set(v: &bond_info->tx_rebalance_counter, i: 0);
1542 bond_info->lp_counter = 0;
1543 goto re_arm;
1544 }
1545
1546 rcu_read_lock();
1547
1548 atomic_inc(v: &bond_info->tx_rebalance_counter);
1549 bond_info->lp_counter++;
1550
1551 /* send learning packets */
1552 if (bond_info->lp_counter >= BOND_ALB_LP_TICKS(bond)) {
1553 bool strict_match;
1554
1555 bond_for_each_slave_rcu(bond, slave, iter) {
1556 /* If updating current_active, use all currently
1557 * user mac addresses (!strict_match). Otherwise, only
1558 * use mac of the slave device.
1559 * In RLB mode, we always use strict matches.
1560 */
1561 strict_match = (slave != rcu_access_pointer(bond->curr_active_slave) ||
1562 bond_info->rlb_enabled);
1563 alb_send_learning_packets(slave, mac_addr: slave->dev->dev_addr,
1564 strict_match);
1565 }
1566 bond_info->lp_counter = 0;
1567 }
1568
1569 /* rebalance tx traffic */
1570 if (atomic_read(v: &bond_info->tx_rebalance_counter) >= BOND_TLB_REBALANCE_TICKS) {
1571 bond_for_each_slave_rcu(bond, slave, iter) {
1572 tlb_clear_slave(bond, slave, save_load: 1);
1573 if (slave == rcu_access_pointer(bond->curr_active_slave)) {
1574 SLAVE_TLB_INFO(slave).load =
1575 bond_info->unbalanced_load /
1576 BOND_TLB_REBALANCE_INTERVAL;
1577 bond_info->unbalanced_load = 0;
1578 }
1579 }
1580 atomic_set(v: &bond_info->tx_rebalance_counter, i: 0);
1581 }
1582
1583 if (bond_info->rlb_enabled) {
1584 if (bond_info->primary_is_promisc &&
1585 (++bond_info->rlb_promisc_timeout_counter >= RLB_PROMISC_TIMEOUT)) {
1586
1587 /* dev_set_promiscuity requires rtnl and
1588 * nothing else. Avoid race with bond_close.
1589 */
1590 rcu_read_unlock();
1591 if (!rtnl_trylock())
1592 goto re_arm;
1593
1594 bond_info->rlb_promisc_timeout_counter = 0;
1595
1596 /* If the primary was set to promiscuous mode
1597 * because a slave was disabled then
1598 * it can now leave promiscuous mode.
1599 */
1600 dev_set_promiscuity(rtnl_dereference(bond->curr_active_slave)->dev,
1601 inc: -1);
1602 bond_info->primary_is_promisc = 0;
1603
1604 rtnl_unlock();
1605 rcu_read_lock();
1606 }
1607
1608 if (bond_info->rlb_rebalance) {
1609 bond_info->rlb_rebalance = 0;
1610 rlb_rebalance(bond);
1611 }
1612
1613 /* check if clients need updating */
1614 if (bond_info->rx_ntt) {
1615 if (bond_info->rlb_update_delay_counter) {
1616 --bond_info->rlb_update_delay_counter;
1617 } else {
1618 rlb_update_rx_clients(bond);
1619 if (bond_info->rlb_update_retry_counter)
1620 --bond_info->rlb_update_retry_counter;
1621 else
1622 bond_info->rx_ntt = 0;
1623 }
1624 }
1625 }
1626 rcu_read_unlock();
1627re_arm:
1628 queue_delayed_work(wq: bond->wq, dwork: &bond->alb_work, delay: alb_delta_in_ticks);
1629}
1630
1631/* assumption: called before the slave is attached to the bond
1632 * and not locked by the bond lock
1633 */
1634int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
1635{
1636 int res;
1637
1638 res = alb_set_slave_mac_addr(slave, addr: slave->perm_hwaddr,
1639 len: slave->dev->addr_len);
1640 if (res)
1641 return res;
1642
1643 res = alb_handle_addr_collision_on_attach(bond, slave);
1644 if (res)
1645 return res;
1646
1647 tlb_init_slave(slave);
1648
1649 /* order a rebalance ASAP */
1650 atomic_set(v: &bond->alb_info.tx_rebalance_counter,
1651 BOND_TLB_REBALANCE_TICKS);
1652
1653 if (bond->alb_info.rlb_enabled)
1654 bond->alb_info.rlb_rebalance = 1;
1655
1656 return 0;
1657}
1658
1659/* Remove slave from tlb and rlb hash tables, and fix up MAC addresses
1660 * if necessary.
1661 *
1662 * Caller must hold RTNL and no other locks
1663 */
1664void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
1665{
1666 if (bond_has_slaves(bond))
1667 alb_change_hw_addr_on_detach(bond, slave);
1668
1669 tlb_clear_slave(bond, slave, save_load: 0);
1670
1671 if (bond->alb_info.rlb_enabled) {
1672 bond->alb_info.rx_slave = NULL;
1673 rlb_clear_slave(bond, slave);
1674 }
1675
1676}
1677
1678void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
1679{
1680 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
1681
1682 if (link == BOND_LINK_DOWN) {
1683 tlb_clear_slave(bond, slave, save_load: 0);
1684 if (bond->alb_info.rlb_enabled)
1685 rlb_clear_slave(bond, slave);
1686 } else if (link == BOND_LINK_UP) {
1687 /* order a rebalance ASAP */
1688 atomic_set(v: &bond_info->tx_rebalance_counter,
1689 BOND_TLB_REBALANCE_TICKS);
1690 if (bond->alb_info.rlb_enabled) {
1691 bond->alb_info.rlb_rebalance = 1;
1692 /* If the updelay module parameter is smaller than the
1693 * forwarding delay of the switch the rebalance will
1694 * not work because the rebalance arp replies will
1695 * not be forwarded to the clients..
1696 */
1697 }
1698 }
1699
1700 if (bond_is_nondyn_tlb(bond)) {
1701 if (bond_update_slave_arr(bond, NULL))
1702 pr_err("Failed to build slave-array for TLB mode.\n");
1703 }
1704}
1705
1706/**
1707 * bond_alb_handle_active_change - assign new curr_active_slave
1708 * @bond: our bonding struct
1709 * @new_slave: new slave to assign
1710 *
1711 * Set the bond->curr_active_slave to @new_slave and handle
1712 * mac address swapping and promiscuity changes as needed.
1713 *
1714 * Caller must hold RTNL
1715 */
1716void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave)
1717{
1718 struct slave *swap_slave;
1719 struct slave *curr_active;
1720
1721 curr_active = rtnl_dereference(bond->curr_active_slave);
1722 if (curr_active == new_slave)
1723 return;
1724
1725 if (curr_active && bond->alb_info.primary_is_promisc) {
1726 dev_set_promiscuity(dev: curr_active->dev, inc: -1);
1727 bond->alb_info.primary_is_promisc = 0;
1728 bond->alb_info.rlb_promisc_timeout_counter = 0;
1729 }
1730
1731 swap_slave = curr_active;
1732 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1733
1734 if (!new_slave || !bond_has_slaves(bond))
1735 return;
1736
1737 /* set the new curr_active_slave to the bonds mac address
1738 * i.e. swap mac addresses of old curr_active_slave and new curr_active_slave
1739 */
1740 if (!swap_slave)
1741 swap_slave = bond_slave_has_mac(bond, mac: bond->dev->dev_addr);
1742
1743 /* Arrange for swap_slave and new_slave to temporarily be
1744 * ignored so we can mess with their MAC addresses without
1745 * fear of interference from transmit activity.
1746 */
1747 if (swap_slave)
1748 tlb_clear_slave(bond, slave: swap_slave, save_load: 1);
1749 tlb_clear_slave(bond, slave: new_slave, save_load: 1);
1750
1751 /* in TLB mode, the slave might flip down/up with the old dev_addr,
1752 * and thus filter bond->dev_addr's packets, so force bond's mac
1753 */
1754 if (BOND_MODE(bond) == BOND_MODE_TLB) {
1755 struct sockaddr_storage ss;
1756 u8 tmp_addr[MAX_ADDR_LEN];
1757
1758 bond_hw_addr_copy(dst: tmp_addr, src: new_slave->dev->dev_addr,
1759 len: new_slave->dev->addr_len);
1760
1761 bond_hw_addr_copy(dst: ss.__data, src: bond->dev->dev_addr,
1762 len: bond->dev->addr_len);
1763 ss.ss_family = bond->dev->type;
1764 /* we don't care if it can't change its mac, best effort */
1765 dev_set_mac_address(dev: new_slave->dev, sa: (struct sockaddr *)&ss,
1766 NULL);
1767
1768 dev_addr_set(dev: new_slave->dev, addr: tmp_addr);
1769 }
1770
1771 /* curr_active_slave must be set before calling alb_swap_mac_addr */
1772 if (swap_slave) {
1773 /* swap mac address */
1774 alb_swap_mac_addr(slave1: swap_slave, slave2: new_slave);
1775 alb_fasten_mac_swap(bond, slave1: swap_slave, slave2: new_slave);
1776 } else {
1777 /* set the new_slave to the bond mac address */
1778 alb_set_slave_mac_addr(slave: new_slave, addr: bond->dev->dev_addr,
1779 len: bond->dev->addr_len);
1780 alb_send_learning_packets(slave: new_slave, mac_addr: bond->dev->dev_addr,
1781 strict_match: false);
1782 }
1783}
1784
1785/* Called with RTNL */
1786int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
1787{
1788 struct bonding *bond = netdev_priv(dev: bond_dev);
1789 struct sockaddr_storage *ss = addr;
1790 struct slave *curr_active;
1791 struct slave *swap_slave;
1792 int res;
1793
1794 if (!is_valid_ether_addr(addr: ss->__data))
1795 return -EADDRNOTAVAIL;
1796
1797 res = alb_set_mac_address(bond, addr);
1798 if (res)
1799 return res;
1800
1801 dev_addr_set(dev: bond_dev, addr: ss->__data);
1802
1803 /* If there is no curr_active_slave there is nothing else to do.
1804 * Otherwise we'll need to pass the new address to it and handle
1805 * duplications.
1806 */
1807 curr_active = rtnl_dereference(bond->curr_active_slave);
1808 if (!curr_active)
1809 return 0;
1810
1811 swap_slave = bond_slave_has_mac(bond, mac: bond_dev->dev_addr);
1812
1813 if (swap_slave) {
1814 alb_swap_mac_addr(slave1: swap_slave, slave2: curr_active);
1815 alb_fasten_mac_swap(bond, slave1: swap_slave, slave2: curr_active);
1816 } else {
1817 alb_set_slave_mac_addr(slave: curr_active, addr: bond_dev->dev_addr,
1818 len: bond_dev->addr_len);
1819
1820 alb_send_learning_packets(slave: curr_active,
1821 mac_addr: bond_dev->dev_addr, strict_match: false);
1822 if (bond->alb_info.rlb_enabled) {
1823 /* inform clients mac address has changed */
1824 rlb_req_update_slave_clients(bond, slave: curr_active);
1825 }
1826 }
1827
1828 return 0;
1829}
1830
1831void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
1832{
1833 if (bond->alb_info.rlb_enabled)
1834 rlb_clear_vlan(bond, vlan_id);
1835}
1836
1837

source code of linux/drivers/net/bonding/bond_alb.c