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