drivers/net/team/team.c

   1 /*
   2  * net/drivers/team/team.c - Network team device driver
   3  * Copyright (c) 2011 Jiri Pirko <jpirko@redhat.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/types.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/slab.h>
  16 #include <linux/rcupdate.h>
  17 #include <linux/errno.h>
  18 #include <linux/ctype.h>
  19 #include <linux/notifier.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/if_vlan.h>
  22 #include <linux/if_arp.h>
  23 #include <linux/socket.h>
  24 #include <linux/etherdevice.h>
  25 #include <linux/rtnetlink.h>
  26 #include <net/rtnetlink.h>
  27 #include <net/genetlink.h>
  28 #include <net/netlink.h>
  29 #include <linux/if_team.h>
  30
  31 #define DRV_NAME "team"
  32
  33
  34 /**********
  35  * Helpers
  36  **********/
  37
  38 #define team_port_exists(dev) (dev->priv_flags & IFF_TEAM_PORT)
  39
  40 static struct team_port *team_port_get_rcu(const struct net_device *dev)
  41 {
  42         struct team_port *port = rcu_dereference(dev->rx_handler_data);
  43
  44         return team_port_exists(dev) ? port : NULL;
  45 }
  46
  47 static struct team_port *team_port_get_rtnl(const struct net_device *dev)
  48 {
  49         struct team_port *port = rtnl_dereference(dev->rx_handler_data);
  50
  51         return team_port_exists(dev) ? port : NULL;
  52 }
  53
  54 /*
  55  * Since the ability to change mac address for open port device is tested in
  56  * team_port_add, this function can be called without control of return value
  57  */
  58 static int __set_port_mac(struct net_device *port_dev,
  59                           const unsigned char *dev_addr)
  60 {
  61         struct sockaddr addr;
  62
  63         memcpy(addr.sa_data, dev_addr, ETH_ALEN);
  64         addr.sa_family = ARPHRD_ETHER;
  65         return dev_set_mac_address(port_dev, &addr);
  66 }
  67
  68 static int team_port_set_orig_mac(struct team_port *port)
  69 {
  70         return __set_port_mac(port->dev, port->orig.dev_addr);
  71 }
  72
  73 int team_port_set_team_mac(struct team_port *port)
  74 {
  75         return __set_port_mac(port->dev, port->team->dev->dev_addr);
  76 }
  77 EXPORT_SYMBOL(team_port_set_team_mac);
  78
  79 static void team_refresh_port_linkup(struct team_port *port)
  80 {
  81         port->linkup = port->user.linkup_enabled ? port->user.linkup :
  82                                                    port->state.linkup;
  83 }
  84
  85 /*******************
  86  * Options handling
  87  *******************/
  88
  89 struct team_option_inst { /* One for each option instance */
  90         struct list_head list;
  91         struct team_option *option;
  92         struct team_port *port; /* != NULL if per-port */
  93         bool changed;
  94         bool removed;
  95 };
  96
  97 static struct team_option *__team_find_option(struct team *team,
  98                                               const char *opt_name)
  99 {
 100         struct team_option *option;
 101
 102         list_for_each_entry(option, &team->option_list, list) {
 103                 if (strcmp(option->name, opt_name) == 0)
 104                         return option;
 105         }
 106         return NULL;
 107 }
 108
 109 static int __team_option_inst_add(struct team *team, struct team_option *option,
 110                                   struct team_port *port)
 111 {
 112         struct team_option_inst *opt_inst;
 113
 114         opt_inst = kmalloc(sizeof(*opt_inst), GFP_KERNEL);
 115         if (!opt_inst)
 116                 return -ENOMEM;
 117         opt_inst->option = option;
 118         opt_inst->port = port;
 119         opt_inst->changed = true;
 120         opt_inst->removed = false;
 121         list_add_tail(&opt_inst->list, &team->option_inst_list);
 122         return 0;
 123 }
 124
 125 static void __team_option_inst_del(struct team_option_inst *opt_inst)
 126 {
 127         list_del(&opt_inst->list);
 128         kfree(opt_inst);
 129 }
 130
 131 static void __team_option_inst_del_option(struct team *team,
 132                                           struct team_option *option)
 133 {
 134         struct team_option_inst *opt_inst, *tmp;
 135
 136         list_for_each_entry_safe(opt_inst, tmp, &team->option_inst_list, list) {
 137                 if (opt_inst->option == option)
 138                         __team_option_inst_del(opt_inst);
 139         }
 140 }
 141
 142 static int __team_option_inst_add_option(struct team *team,
 143                                          struct team_option *option)
 144 {
 145         struct team_port *port;
 146         int err;
 147
 148         if (!option->per_port)
 149                 return __team_option_inst_add(team, option, 0);
 150
 151         list_for_each_entry(port, &team->port_list, list) {
 152                 err = __team_option_inst_add(team, option, port);
 153                 if (err)
 154                         goto inst_del_option;
 155         }
 156         return 0;
 157
 158 inst_del_option:
 159         __team_option_inst_del_option(team, option);
 160         return err;
 161 }
 162
 163 static void __team_option_inst_mark_removed_option(struct team *team,
 164                                                    struct team_option *option)
 165 {
 166         struct team_option_inst *opt_inst;
 167
 168         list_for_each_entry(opt_inst, &team->option_inst_list, list) {
 169                 if (opt_inst->option == option) {
 170                         opt_inst->changed = true;
 171                         opt_inst->removed = true;
 172                 }
 173         }
 174 }
 175
 176 static void __team_option_inst_del_port(struct team *team,
 177                                         struct team_port *port)
 178 {
 179         struct team_option_inst *opt_inst, *tmp;
 180
 181         list_for_each_entry_safe(opt_inst, tmp, &team->option_inst_list, list) {
 182                 if (opt_inst->option->per_port &&
 183                     opt_inst->port == port)
 184                         __team_option_inst_del(opt_inst);
 185         }
 186 }
 187
 188 static int __team_option_inst_add_port(struct team *team,
 189                                        struct team_port *port)
 190 {
 191         struct team_option *option;
 192         int err;
 193
 194         list_for_each_entry(option, &team->option_list, list) {
 195                 if (!option->per_port)
 196                         continue;
 197                 err = __team_option_inst_add(team, option, port);
 198                 if (err)
 199                         goto inst_del_port;
 200         }
 201         return 0;
 202
 203 inst_del_port:
 204         __team_option_inst_del_port(team, port);
 205         return err;
 206 }
 207
 208 static void __team_option_inst_mark_removed_port(struct team *team,
 209                                                  struct team_port *port)
 210 {
 211         struct team_option_inst *opt_inst;
 212
 213         list_for_each_entry(opt_inst, &team->option_inst_list, list) {
 214                 if (opt_inst->port == port) {
 215                         opt_inst->changed = true;
 216                         opt_inst->removed = true;
 217                 }
 218         }
 219 }
 220
 221 static int __team_options_register(struct team *team,
 222                                    const struct team_option *option,
 223                                    size_t option_count)
 224 {
 225         int i;
 226         struct team_option **dst_opts;
 227         int err;
 228
 229         dst_opts = kzalloc(sizeof(struct team_option *) * option_count,
 230                            GFP_KERNEL);
 231         if (!dst_opts)
 232                 return -ENOMEM;
 233         for (i = 0; i < option_count; i++, option++) {
 234                 if (__team_find_option(team, option->name)) {
 235                         err = -EEXIST;
 236                         goto alloc_rollback;
 237                 }
 238                 dst_opts[i] = kmemdup(option, sizeof(*option), GFP_KERNEL);
 239                 if (!dst_opts[i]) {
 240                         err = -ENOMEM;
 241                         goto alloc_rollback;
 242                 }
 243         }
 244
 245         for (i = 0; i < option_count; i++) {
 246                 err = __team_option_inst_add_option(team, dst_opts[i]);
 247                 if (err)
 248                         goto inst_rollback;
 249                 list_add_tail(&dst_opts[i]->list, &team->option_list);
 250         }
 251
 252         kfree(dst_opts);
 253         return 0;
 254
 255 inst_rollback:
 256         for (i--; i >= 0; i--)
 257                 __team_option_inst_del_option(team, dst_opts[i]);
 258
 259         i = option_count - 1;
 260 alloc_rollback:
 261         for (i--; i >= 0; i--)
 262                 kfree(dst_opts[i]);
 263
 264         kfree(dst_opts);
 265         return err;
 266 }
 267
 268 static void __team_options_mark_removed(struct team *team,
 269                                         const struct team_option *option,
 270                                         size_t option_count)
 271 {
 272         int i;
 273
 274         for (i = 0; i < option_count; i++, option++) {
 275                 struct team_option *del_opt;
 276
 277                 del_opt = __team_find_option(team, option->name);
 278                 if (del_opt)
 279                         __team_option_inst_mark_removed_option(team, del_opt);
 280         }
 281 }
 282
 283 static void __team_options_unregister(struct team *team,
 284                                       const struct team_option *option,
 285                                       size_t option_count)
 286 {
 287         int i;
 288
 289         for (i = 0; i < option_count; i++, option++) {
 290                 struct team_option *del_opt;
 291
 292                 del_opt = __team_find_option(team, option->name);
 293                 if (del_opt) {
 294                         __team_option_inst_del_option(team, del_opt);
 295                         list_del(&del_opt->list);
 296                         kfree(del_opt);
 297                 }
 298         }
 299 }
 300
 301 static void __team_options_change_check(struct team *team);
 302
 303 int team_options_register(struct team *team,
 304                           const struct team_option *option,
 305                           size_t option_count)
 306 {
 307         int err;
 308
 309         err = __team_options_register(team, option, option_count);
 310         if (err)
 311                 return err;
 312         __team_options_change_check(team);
 313         return 0;
 314 }
 315 EXPORT_SYMBOL(team_options_register);
 316
 317 void team_options_unregister(struct team *team,
 318                              const struct team_option *option,
 319                              size_t option_count)
 320 {
 321         __team_options_mark_removed(team, option, option_count);
 322         __team_options_change_check(team);
 323         __team_options_unregister(team, option, option_count);
 324 }
 325 EXPORT_SYMBOL(team_options_unregister);
 326
 327 static int team_option_port_add(struct team *team, struct team_port *port)
 328 {
 329         int err;
 330
 331         err = __team_option_inst_add_port(team, port);
 332         if (err)
 333                 return err;
 334         __team_options_change_check(team);
 335         return 0;
 336 }
 337
 338 static void team_option_port_del(struct team *team, struct team_port *port)
 339 {
 340         __team_option_inst_mark_removed_port(team, port);
 341         __team_options_change_check(team);
 342         __team_option_inst_del_port(team, port);
 343 }
 344
 345 static int team_option_get(struct team *team,
 346                            struct team_option_inst *opt_inst,
 347                            struct team_gsetter_ctx *ctx)
 348 {
 349         return opt_inst->option->getter(team, ctx);
 350 }
 351
 352 static int team_option_set(struct team *team,
 353                            struct team_option_inst *opt_inst,
 354                            struct team_gsetter_ctx *ctx)
 355 {
 356         int err;
 357
 358         err = opt_inst->option->setter(team, ctx);
 359         if (err)
 360                 return err;
 361
 362         opt_inst->changed = true;
 363         __team_options_change_check(team);
 364         return err;
 365 }
 366
 367 /****************
 368  * Mode handling
 369  ****************/
 370
 371 static LIST_HEAD(mode_list);
 372 static DEFINE_SPINLOCK(mode_list_lock);
 373
 374 static struct team_mode *__find_mode(const char *kind)
 375 {
 376         struct team_mode *mode;
 377
 378         list_for_each_entry(mode, &mode_list, list) {
 379                 if (strcmp(mode->kind, kind) == 0)
 380                         return mode;
 381         }
 382         return NULL;
 383 }
 384
 385 static bool is_good_mode_name(const char *name)
 386 {
 387         while (*name != '\0') {
 388                 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
 389                         return false;
 390                 name++;
 391         }
 392         return true;
 393 }
 394
 395 int team_mode_register(struct team_mode *mode)
 396 {
 397         int err = 0;
 398
 399         if (!is_good_mode_name(mode->kind) ||
 400             mode->priv_size > TEAM_MODE_PRIV_SIZE)
 401                 return -EINVAL;
 402         spin_lock(&mode_list_lock);
 403         if (__find_mode(mode->kind)) {
 404                 err = -EEXIST;
 405                 goto unlock;
 406         }
 407         list_add_tail(&mode->list, &mode_list);
 408 unlock:
 409         spin_unlock(&mode_list_lock);
 410         return err;
 411 }
 412 EXPORT_SYMBOL(team_mode_register);
 413
 414 int team_mode_unregister(struct team_mode *mode)
 415 {
 416         spin_lock(&mode_list_lock);
 417         list_del_init(&mode->list);
 418         spin_unlock(&mode_list_lock);
 419         return 0;
 420 }
 421 EXPORT_SYMBOL(team_mode_unregister);
 422
 423 static struct team_mode *team_mode_get(const char *kind)
 424 {
 425         struct team_mode *mode;
 426
 427         spin_lock(&mode_list_lock);
 428         mode = __find_mode(kind);
 429         if (!mode) {
 430                 spin_unlock(&mode_list_lock);
 431                 request_module("team-mode-%s", kind);
 432                 spin_lock(&mode_list_lock);
 433                 mode = __find_mode(kind);
 434         }
 435         if (mode)
 436                 if (!try_module_get(mode->owner))
 437                         mode = NULL;
 438
 439         spin_unlock(&mode_list_lock);
 440         return mode;
 441 }
 442
 443 static void team_mode_put(const struct team_mode *mode)
 444 {
 445         module_put(mode->owner);
 446 }
 447
 448 static bool team_dummy_transmit(struct team *team, struct sk_buff *skb)
 449 {
 450         dev_kfree_skb_any(skb);
 451         return false;
 452 }
 453
 454 rx_handler_result_t team_dummy_receive(struct team *team,
 455                                        struct team_port *port,
 456                                        struct sk_buff *skb)
 457 {
 458         return RX_HANDLER_ANOTHER;
 459 }
 460
 461 static void team_adjust_ops(struct team *team)
 462 {
 463         /*
 464          * To avoid checks in rx/tx skb paths, ensure here that non-null and
 465          * correct ops are always set.
 466          */
 467
 468         if (list_empty(&team->port_list) ||
 469             !team->mode || !team->mode->ops->transmit)
 470                 team->ops.transmit = team_dummy_transmit;
 471         else
 472                 team->ops.transmit = team->mode->ops->transmit;
 473
 474         if (list_empty(&team->port_list) ||
 475             !team->mode || !team->mode->ops->receive)
 476                 team->ops.receive = team_dummy_receive;
 477         else
 478                 team->ops.receive = team->mode->ops->receive;
 479 }
 480
 481 /*
 482  * We can benefit from the fact that it's ensured no port is present
 483  * at the time of mode change. Therefore no packets are in fly so there's no
 484  * need to set mode operations in any special way.
 485  */
 486 static int __team_change_mode(struct team *team,
 487                               const struct team_mode *new_mode)
 488 {
 489         /* Check if mode was previously set and do cleanup if so */
 490         if (team->mode) {
 491                 void (*exit_op)(struct team *team) = team->ops.exit;
 492
 493                 /* Clear ops area so no callback is called any longer */
 494                 memset(&team->ops, 0, sizeof(struct team_mode_ops));
 495                 team_adjust_ops(team);
 496
 497                 if (exit_op)
 498                         exit_op(team);
 499                 team_mode_put(team->mode);
 500                 team->mode = NULL;
 501                 /* zero private data area */
 502                 memset(&team->mode_priv, 0,
 503                        sizeof(struct team) - offsetof(struct team, mode_priv));
 504         }
 505
 506         if (!new_mode)
 507                 return 0;
 508
 509         if (new_mode->ops->init) {
 510                 int err;
 511
 512                 err = new_mode->ops->init(team);
 513                 if (err)
 514                         return err;
 515         }
 516
 517         team->mode = new_mode;
 518         memcpy(&team->ops, new_mode->ops, sizeof(struct team_mode_ops));
 519         team_adjust_ops(team);
 520
 521         return 0;
 522 }
 523
 524 static int team_change_mode(struct team *team, const char *kind)
 525 {
 526         struct team_mode *new_mode;
 527         struct net_device *dev = team->dev;
 528         int err;
 529
 530         if (!list_empty(&team->port_list)) {
 531                 netdev_err(dev, "No ports can be present during mode change\n");
 532                 return -EBUSY;
 533         }
 534
 535         if (team->mode && strcmp(team->mode->kind, kind) == 0) {
 536                 netdev_err(dev, "Unable to change to the same mode the team is in\n");
 537                 return -EINVAL;
 538         }
 539
 540         new_mode = team_mode_get(kind);
 541         if (!new_mode) {
 542                 netdev_err(dev, "Mode \"%s\" not found\n", kind);
 543                 return -EINVAL;
 544         }
 545
 546         err = __team_change_mode(team, new_mode);
 547         if (err) {
 548                 netdev_err(dev, "Failed to change to mode \"%s\"\n", kind);
 549                 team_mode_put(new_mode);
 550                 return err;
 551         }
 552
 553         netdev_info(dev, "Mode changed to \"%s\"\n", kind);
 554         return 0;
 555 }
 556
 557
 558 /************************
 559  * Rx path frame handler
 560  ************************/
 561
 562 static bool team_port_enabled(struct team_port *port);
 563
 564 /* note: already called with rcu_read_lock */
 565 static rx_handler_result_t team_handle_frame(struct sk_buff **pskb)
 566 {
 567         struct sk_buff *skb = *pskb;
 568         struct team_port *port;
 569         struct team *team;
 570         rx_handler_result_t res;
 571
 572         skb = skb_share_check(skb, GFP_ATOMIC);
 573         if (!skb)
 574                 return RX_HANDLER_CONSUMED;
 575
 576         *pskb = skb;
 577
 578         port = team_port_get_rcu(skb->dev);
 579         team = port->team;
 580         if (!team_port_enabled(port)) {
 581                 /* allow exact match delivery for disabled ports */
 582                 res = RX_HANDLER_EXACT;
 583         } else {
 584                 res = team->ops.receive(team, port, skb);
 585         }
 586         if (res == RX_HANDLER_ANOTHER) {
 587                 struct team_pcpu_stats *pcpu_stats;
 588
 589                 pcpu_stats = this_cpu_ptr(team->pcpu_stats);
 590                 u64_stats_update_begin(&pcpu_stats->syncp);
 591                 pcpu_stats->rx_packets++;
 592                 pcpu_stats->rx_bytes += skb->len;
 593                 if (skb->pkt_type == PACKET_MULTICAST)
 594                         pcpu_stats->rx_multicast++;
 595                 u64_stats_update_end(&pcpu_stats->syncp);
 596
 597                 skb->dev = team->dev;
 598         } else {
 599                 this_cpu_inc(team->pcpu_stats->rx_dropped);
 600         }
 601
 602         return res;
 603 }
 604
 605
 606 /****************
 607  * Port handling
 608  ****************/
 609
 610 static bool team_port_find(const struct team *team,
 611                            const struct team_port *port)
 612 {
 613         struct team_port *cur;
 614
 615         list_for_each_entry(cur, &team->port_list, list)
 616                 if (cur == port)
 617                         return true;
 618         return false;
 619 }
 620
 621 static bool team_port_enabled(struct team_port *port)
 622 {
 623         return port->index != -1;
 624 }
 625
 626 /*
 627  * Enable/disable port by adding to enabled port hashlist and setting
 628  * port->index (Might be racy so reader could see incorrect ifindex when
 629  * processing a flying packet, but that is not a problem). Write guarded
 630  * by team->lock.
 631  */
 632 static void team_port_enable(struct team *team,
 633                              struct team_port *port)
 634 {
 635         if (team_port_enabled(port))
 636                 return;
 637         port->index = team->en_port_count++;
 638         hlist_add_head_rcu(&port->hlist,
 639                            team_port_index_hash(team, port->index));
 640 }
 641
 642 static void __reconstruct_port_hlist(struct team *team, int rm_index)
 643 {
 644         int i;
 645         struct team_port *port;
 646
 647         for (i = rm_index + 1; i < team->en_port_count; i++) {
 648                 port = team_get_port_by_index(team, i);
 649                 hlist_del_rcu(&port->hlist);
 650                 port->index--;
 651                 hlist_add_head_rcu(&port->hlist,
 652                                    team_port_index_hash(team, port->index));
 653         }
 654 }
 655
 656 static void team_port_disable(struct team *team,
 657                               struct team_port *port)
 658 {
 659         int rm_index = port->index;
 660
 661         if (!team_port_enabled(port))
 662                 return;
 663         hlist_del_rcu(&port->hlist);
 664         __reconstruct_port_hlist(team, rm_index);
 665         team->en_port_count--;
 666         port->index = -1;
 667 }
 668
 669 #define TEAM_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
 670                             NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
 671                             NETIF_F_HIGHDMA | NETIF_F_LRO)
 672
 673 static void __team_compute_features(struct team *team)
 674 {
 675         struct team_port *port;
 676         u32 vlan_features = TEAM_VLAN_FEATURES;
 677         unsigned short max_hard_header_len = ETH_HLEN;
 678
 679         list_for_each_entry(port, &team->port_list, list) {
 680                 vlan_features = netdev_increment_features(vlan_features,
 681                                         port->dev->vlan_features,
 682                                         TEAM_VLAN_FEATURES);
 683
 684                 if (port->dev->hard_header_len > max_hard_header_len)
 685                         max_hard_header_len = port->dev->hard_header_len;
 686         }
 687
 688         team->dev->vlan_features = vlan_features;
 689         team->dev->hard_header_len = max_hard_header_len;
 690
 691         netdev_change_features(team->dev);
 692 }
 693
 694 static void team_compute_features(struct team *team)
 695 {
 696         mutex_lock(&team->lock);
 697         __team_compute_features(team);
 698         mutex_unlock(&team->lock);
 699 }
 700
 701 static int team_port_enter(struct team *team, struct team_port *port)
 702 {
 703         int err = 0;
 704
 705         dev_hold(team->dev);
 706         port->dev->priv_flags |= IFF_TEAM_PORT;
 707         if (team->ops.port_enter) {
 708                 err = team->ops.port_enter(team, port);
 709                 if (err) {
 710                         netdev_err(team->dev, "Device %s failed to enter team mode\n",
 711                                    port->dev->name);
 712                         goto err_port_enter;
 713                 }
 714         }
 715
 716         return 0;
 717
 718 err_port_enter:
 719         port->dev->priv_flags &= ~IFF_TEAM_PORT;
 720         dev_put(team->dev);
 721
 722         return err;
 723 }
 724
 725 static void team_port_leave(struct team *team, struct team_port *port)
 726 {
 727         if (team->ops.port_leave)
 728                 team->ops.port_leave(team, port);
 729         port->dev->priv_flags &= ~IFF_TEAM_PORT;
 730         dev_put(team->dev);
 731 }
 732
 733 static void __team_port_change_check(struct team_port *port, bool linkup);
 734
 735 static int team_port_add(struct team *team, struct net_device *port_dev)
 736 {
 737         struct net_device *dev = team->dev;
 738         struct team_port *port;
 739         char *portname = port_dev->name;
 740         int err;
 741
 742         if (port_dev->flags & IFF_LOOPBACK ||
 743             port_dev->type != ARPHRD_ETHER) {
 744                 netdev_err(dev, "Device %s is of an unsupported type\n",
 745                            portname);
 746                 return -EINVAL;
 747         }
 748
 749         if (team_port_exists(port_dev)) {
 750                 netdev_err(dev, "Device %s is already a port "
 751                                 "of a team device\n", portname);
 752                 return -EBUSY;
 753         }
 754
 755         if (port_dev->flags & IFF_UP) {
 756                 netdev_err(dev, "Device %s is up. Set it down before adding it as a team port\n",
 757                            portname);
 758                 return -EBUSY;
 759         }
 760
 761         port = kzalloc(sizeof(struct team_port), GFP_KERNEL);
 762         if (!port)
 763                 return -ENOMEM;
 764
 765         port->dev = port_dev;
 766         port->team = team;
 767
 768         port->orig.mtu = port_dev->mtu;
 769         err = dev_set_mtu(port_dev, dev->mtu);
 770         if (err) {
 771                 netdev_dbg(dev, "Error %d calling dev_set_mtu\n", err);
 772                 goto err_set_mtu;
 773         }
 774
 775         memcpy(port->orig.dev_addr, port_dev->dev_addr, ETH_ALEN);
 776
 777         err = team_port_enter(team, port);
 778         if (err) {
 779                 netdev_err(dev, "Device %s failed to enter team mode\n",
 780                            portname);
 781                 goto err_port_enter;
 782         }
 783
 784         err = dev_open(port_dev);
 785         if (err) {
 786                 netdev_dbg(dev, "Device %s opening failed\n",
 787                            portname);
 788                 goto err_dev_open;
 789         }
 790
 791         err = vlan_vids_add_by_dev(port_dev, dev);
 792         if (err) {
 793                 netdev_err(dev, "Failed to add vlan ids to device %s\n",
 794                                 portname);
 795                 goto err_vids_add;
 796         }
 797
 798         err = netdev_set_master(port_dev, dev);
 799         if (err) {
 800                 netdev_err(dev, "Device %s failed to set master\n", portname);
 801                 goto err_set_master;
 802         }
 803
 804         err = netdev_rx_handler_register(port_dev, team_handle_frame,
 805                                          port);
 806         if (err) {
 807                 netdev_err(dev, "Device %s failed to register rx_handler\n",
 808                            portname);
 809                 goto err_handler_register;
 810         }
 811
 812         err = team_option_port_add(team, port);
 813         if (err) {
 814                 netdev_err(dev, "Device %s failed to add per-port options\n",
 815                            portname);
 816                 goto err_option_port_add;
 817         }
 818
 819         port->index = -1;
 820         team_port_enable(team, port);
 821         list_add_tail_rcu(&port->list, &team->port_list);
 822         team_adjust_ops(team);
 823         __team_compute_features(team);
 824         __team_port_change_check(port, !!netif_carrier_ok(port_dev));
 825
 826         netdev_info(dev, "Port device %s added\n", portname);
 827
 828         return 0;
 829
 830 err_option_port_add:
 831         netdev_rx_handler_unregister(port_dev);
 832
 833 err_handler_register:
 834         netdev_set_master(port_dev, NULL);
 835
 836 err_set_master:
 837         vlan_vids_del_by_dev(port_dev, dev);
 838
 839 err_vids_add:
 840         dev_close(port_dev);
 841
 842 err_dev_open:
 843         team_port_leave(team, port);
 844         team_port_set_orig_mac(port);
 845
 846 err_port_enter:
 847         dev_set_mtu(port_dev, port->orig.mtu);
 848
 849 err_set_mtu:
 850         kfree(port);
 851
 852         return err;
 853 }
 854
 855 static int team_port_del(struct team *team, struct net_device *port_dev)
 856 {
 857         struct net_device *dev = team->dev;
 858         struct team_port *port;
 859         char *portname = port_dev->name;
 860
 861         port = team_port_get_rtnl(port_dev);
 862         if (!port || !team_port_find(team, port)) {
 863                 netdev_err(dev, "Device %s does not act as a port of this team\n",
 864                            portname);
 865                 return -ENOENT;
 866         }
 867
 868         port->removed = true;
 869         __team_port_change_check(port, false);
 870         team_port_disable(team, port);
 871         list_del_rcu(&port->list);
 872         team_adjust_ops(team);
 873         team_option_port_del(team, port);
 874         netdev_rx_handler_unregister(port_dev);
 875         netdev_set_master(port_dev, NULL);
 876         vlan_vids_del_by_dev(port_dev, dev);
 877         dev_close(port_dev);
 878         team_port_leave(team, port);
 879         team_port_set_orig_mac(port);
 880         dev_set_mtu(port_dev, port->orig.mtu);
 881         synchronize_rcu();
 882         kfree(port);
 883         netdev_info(dev, "Port device %s removed\n", portname);
 884         __team_compute_features(team);
 885
 886         return 0;
 887 }
 888
 889
 890 /*****************
 891  * Net device ops
 892  *****************/
 893
 894 static const char team_no_mode_kind[] = "*NOMODE*";
 895
 896 static int team_mode_option_get(struct team *team, struct team_gsetter_ctx *ctx)
 897 {
 898         ctx->data.str_val = team->mode ? team->mode->kind : team_no_mode_kind;
 899         return 0;
 900 }
 901
 902 static int team_mode_option_set(struct team *team, struct team_gsetter_ctx *ctx)
 903 {
 904         return team_change_mode(team, ctx->data.str_val);
 905 }
 906
 907 static int team_port_en_option_get(struct team *team,
 908                                    struct team_gsetter_ctx *ctx)
 909 {
 910         ctx->data.bool_val = team_port_enabled(ctx->port);
 911         return 0;
 912 }
 913
 914 static int team_port_en_option_set(struct team *team,
 915                                    struct team_gsetter_ctx *ctx)
 916 {
 917         if (ctx->data.bool_val)
 918                 team_port_enable(team, ctx->port);
 919         else
 920                 team_port_disable(team, ctx->port);
 921         return 0;
 922 }
 923
 924 static int team_user_linkup_option_get(struct team *team,
 925                                        struct team_gsetter_ctx *ctx)
 926 {
 927         ctx->data.bool_val = ctx->port->user.linkup;
 928         return 0;
 929 }
 930
 931 static int team_user_linkup_option_set(struct team *team,
 932                                        struct team_gsetter_ctx *ctx)
 933 {
 934         ctx->port->user.linkup = ctx->data.bool_val;
 935         team_refresh_port_linkup(ctx->port);
 936         return 0;
 937 }
 938
 939 static int team_user_linkup_en_option_get(struct team *team,
 940                                           struct team_gsetter_ctx *ctx)
 941 {
 942         struct team_port *port = ctx->port;
 943
 944         ctx->data.bool_val = port->user.linkup_enabled;
 945         return 0;
 946 }
 947
 948 static int team_user_linkup_en_option_set(struct team *team,
 949                                           struct team_gsetter_ctx *ctx)
 950 {
 951         struct team_port *port = ctx->port;
 952
 953         port->user.linkup_enabled = ctx->data.bool_val;
 954         team_refresh_port_linkup(ctx->port);
 955         return 0;
 956 }
 957
 958 static const struct team_option team_options[] = {
 959         {
 960                 .name = "mode",
 961                 .type = TEAM_OPTION_TYPE_STRING,
 962                 .getter = team_mode_option_get,
 963                 .setter = team_mode_option_set,
 964         },
 965         {
 966                 .name = "enabled",
 967                 .type = TEAM_OPTION_TYPE_BOOL,
 968                 .per_port = true,
 969                 .getter = team_port_en_option_get,
 970                 .setter = team_port_en_option_set,
 971         },
 972         {
 973                 .name = "user_linkup",
 974                 .type = TEAM_OPTION_TYPE_BOOL,
 975                 .per_port = true,
 976                 .getter = team_user_linkup_option_get,
 977                 .setter = team_user_linkup_option_set,
 978         },
 979         {
 980                 .name = "user_linkup_enabled",
 981                 .type = TEAM_OPTION_TYPE_BOOL,
 982                 .per_port = true,
 983                 .getter = team_user_linkup_en_option_get,
 984                 .setter = team_user_linkup_en_option_set,
 985         },
 986 };
 987
 988 static int team_init(struct net_device *dev)
 989 {
 990         struct team *team = netdev_priv(dev);
 991         int i;
 992         int err;
 993
 994         team->dev = dev;
 995         mutex_init(&team->lock);
 996
 997         team->pcpu_stats = alloc_percpu(struct team_pcpu_stats);
 998         if (!team->pcpu_stats)
 999                 return -ENOMEM;
1000
1001         for (i = 0; i < TEAM_PORT_HASHENTRIES; i++)
1002                 INIT_HLIST_HEAD(&team->en_port_hlist[i]);
1003         INIT_LIST_HEAD(&team->port_list);
1004
1005         team_adjust_ops(team);
1006
1007         INIT_LIST_HEAD(&team->option_list);
1008         INIT_LIST_HEAD(&team->option_inst_list);
1009         err = team_options_register(team, team_options, ARRAY_SIZE(team_options));
1010         if (err)
1011                 goto err_options_register;
1012         netif_carrier_off(dev);
1013
1014         return 0;
1015
1016 err_options_register:
1017         free_percpu(team->pcpu_stats);
1018
1019         return err;
1020 }
1021
1022 static void team_uninit(struct net_device *dev)
1023 {
1024         struct team *team = netdev_priv(dev);
1025         struct team_port *port;
1026         struct team_port *tmp;
1027
1028         mutex_lock(&team->lock);
1029         list_for_each_entry_safe(port, tmp, &team->port_list, list)
1030                 team_port_del(team, port->dev);
1031
1032         __team_change_mode(team, NULL); /* cleanup */
1033         __team_options_unregister(team, team_options, ARRAY_SIZE(team_options));
1034         mutex_unlock(&team->lock);
1035 }
1036
1037 static void team_destructor(struct net_device *dev)
1038 {
1039         struct team *team = netdev_priv(dev);
1040
1041         free_percpu(team->pcpu_stats);
1042         free_netdev(dev);
1043 }
1044
1045 static int team_open(struct net_device *dev)
1046 {
1047         netif_carrier_on(dev);
1048         return 0;
1049 }
1050
1051 static int team_close(struct net_device *dev)
1052 {
1053         netif_carrier_off(dev);
1054         return 0;
1055 }
1056
1057 /*
1058  * note: already called with rcu_read_lock
1059  */
1060 static netdev_tx_t team_xmit(struct sk_buff *skb, struct net_device *dev)
1061 {
1062         struct team *team = netdev_priv(dev);
1063         bool tx_success = false;
1064         unsigned int len = skb->len;
1065
1066         tx_success = team->ops.transmit(team, skb);
1067         if (tx_success) {
1068                 struct team_pcpu_stats *pcpu_stats;
1069
1070                 pcpu_stats = this_cpu_ptr(team->pcpu_stats);
1071                 u64_stats_update_begin(&pcpu_stats->syncp);
1072                 pcpu_stats->tx_packets++;
1073                 pcpu_stats->tx_bytes += len;
1074                 u64_stats_update_end(&pcpu_stats->syncp);
1075         } else {
1076                 this_cpu_inc(team->pcpu_stats->tx_dropped);
1077         }
1078
1079         return NETDEV_TX_OK;
1080 }
1081
1082 static void team_change_rx_flags(struct net_device *dev, int change)
1083 {
1084         struct team *team = netdev_priv(dev);
1085         struct team_port *port;
1086         int inc;
1087
1088         rcu_read_lock();
1089         list_for_each_entry_rcu(port, &team->port_list, list) {
1090                 if (change & IFF_PROMISC) {
1091                         inc = dev->flags & IFF_PROMISC ? 1 : -1;
1092                         dev_set_promiscuity(port->dev, inc);
1093                 }
1094                 if (change & IFF_ALLMULTI) {
1095                         inc = dev->flags & IFF_ALLMULTI ? 1 : -1;
1096                         dev_set_allmulti(port->dev, inc);
1097                 }
1098         }
1099         rcu_read_unlock();
1100 }
1101
1102 static void team_set_rx_mode(struct net_device *dev)
1103 {
1104         struct team *team = netdev_priv(dev);
1105         struct team_port *port;
1106
1107         rcu_read_lock();
1108         list_for_each_entry_rcu(port, &team->port_list, list) {
1109                 dev_uc_sync(port->dev, dev);
1110                 dev_mc_sync(port->dev, dev);
1111         }
1112         rcu_read_unlock();
1113 }
1114
1115 static int team_set_mac_address(struct net_device *dev, void *p)
1116 {
1117         struct team *team = netdev_priv(dev);
1118         struct team_port *port;
1119         struct sockaddr *addr = p;
1120
1121         dev->addr_assign_type &= ~NET_ADDR_RANDOM;
1122         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
1123         rcu_read_lock();
1124         list_for_each_entry_rcu(port, &team->port_list, list)
1125                 if (team->ops.port_change_mac)
1126                         team->ops.port_change_mac(team, port);
1127         rcu_read_unlock();
1128         return 0;
1129 }
1130
1131 static int team_change_mtu(struct net_device *dev, int new_mtu)
1132 {
1133         struct team *team = netdev_priv(dev);
1134         struct team_port *port;
1135         int err;
1136
1137         /*
1138          * Alhough this is reader, it's guarded by team lock. It's not possible
1139          * to traverse list in reverse under rcu_read_lock
1140          */
1141         mutex_lock(&team->lock);
1142         list_for_each_entry(port, &team->port_list, list) {
1143                 err = dev_set_mtu(port->dev, new_mtu);
1144                 if (err) {
1145                         netdev_err(dev, "Device %s failed to change mtu",
1146                                    port->dev->name);
1147                         goto unwind;
1148                 }
1149         }
1150         mutex_unlock(&team->lock);
1151
1152         dev->mtu = new_mtu;
1153
1154         return 0;
1155
1156 unwind:
1157         list_for_each_entry_continue_reverse(port, &team->port_list, list)
1158                 dev_set_mtu(port->dev, dev->mtu);
1159         mutex_unlock(&team->lock);
1160
1161         return err;
1162 }
1163
1164 static struct rtnl_link_stats64 *
1165 team_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1166 {
1167         struct team *team = netdev_priv(dev);
1168         struct team_pcpu_stats *p;
1169         u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
1170         u32 rx_dropped = 0, tx_dropped = 0;
1171         unsigned int start;
1172         int i;
1173
1174         for_each_possible_cpu(i) {
1175                 p = per_cpu_ptr(team->pcpu_stats, i);
1176                 do {
1177                         start = u64_stats_fetch_begin_bh(&p->syncp);
1178                         rx_packets      = p->rx_packets;
1179                         rx_bytes        = p->rx_bytes;
1180                         rx_multicast    = p->rx_multicast;
1181                         tx_packets      = p->tx_packets;
1182                         tx_bytes        = p->tx_bytes;
1183                 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
1184
1185                 stats->rx_packets       += rx_packets;
1186                 stats->rx_bytes         += rx_bytes;
1187                 stats->multicast        += rx_multicast;
1188                 stats->tx_packets       += tx_packets;
1189                 stats->tx_bytes         += tx_bytes;
1190                 /*
1191                  * rx_dropped & tx_dropped are u32, updated
1192                  * without syncp protection.
1193                  */
1194                 rx_dropped      += p->rx_dropped;
1195                 tx_dropped      += p->tx_dropped;
1196         }
1197         stats->rx_dropped       = rx_dropped;
1198         stats->tx_dropped       = tx_dropped;
1199         return stats;
1200 }
1201
1202 static int team_vlan_rx_add_vid(struct net_device *dev, uint16_t vid)
1203 {
1204         struct team *team = netdev_priv(dev);
1205         struct team_port *port;
1206         int err;
1207
1208         /*
1209          * Alhough this is reader, it's guarded by team lock. It's not possible
1210          * to traverse list in reverse under rcu_read_lock
1211          */
1212         mutex_lock(&team->lock);
1213         list_for_each_entry(port, &team->port_list, list) {
1214                 err = vlan_vid_add(port->dev, vid);
1215                 if (err)
1216                         goto unwind;
1217         }
1218         mutex_unlock(&team->lock);
1219
1220         return 0;
1221
1222 unwind:
1223         list_for_each_entry_continue_reverse(port, &team->port_list, list)
1224                 vlan_vid_del(port->dev, vid);
1225         mutex_unlock(&team->lock);
1226
1227         return err;
1228 }
1229
1230 static int team_vlan_rx_kill_vid(struct net_device *dev, uint16_t vid)
1231 {
1232         struct team *team = netdev_priv(dev);
1233         struct team_port *port;
1234
1235         rcu_read_lock();
1236         list_for_each_entry_rcu(port, &team->port_list, list)
1237                 vlan_vid_del(port->dev, vid);
1238         rcu_read_unlock();
1239
1240         return 0;
1241 }
1242
1243 static int team_add_slave(struct net_device *dev, struct net_device *port_dev)
1244 {
1245         struct team *team = netdev_priv(dev);
1246         int err;
1247
1248         mutex_lock(&team->lock);
1249         err = team_port_add(team, port_dev);
1250         mutex_unlock(&team->lock);
1251         return err;
1252 }
1253
1254 static int team_del_slave(struct net_device *dev, struct net_device *port_dev)
1255 {
1256         struct team *team = netdev_priv(dev);
1257         int err;
1258
1259         mutex_lock(&team->lock);
1260         err = team_port_del(team, port_dev);
1261         mutex_unlock(&team->lock);
1262         return err;
1263 }
1264
1265 static netdev_features_t team_fix_features(struct net_device *dev,
1266                                            netdev_features_t features)
1267 {
1268         struct team_port *port;
1269         struct team *team = netdev_priv(dev);
1270         netdev_features_t mask;
1271
1272         mask = features;
1273         features &= ~NETIF_F_ONE_FOR_ALL;
1274         features |= NETIF_F_ALL_FOR_ALL;
1275
1276         rcu_read_lock();
1277         list_for_each_entry_rcu(port, &team->port_list, list) {
1278                 features = netdev_increment_features(features,
1279                                                      port->dev->features,
1280                                                      mask);
1281         }
1282         rcu_read_unlock();
1283         return features;
1284 }
1285
1286 static const struct net_device_ops team_netdev_ops = {
1287         .ndo_init               = team_init,
1288         .ndo_uninit             = team_uninit,
1289         .ndo_open               = team_open,
1290         .ndo_stop               = team_close,
1291         .ndo_start_xmit         = team_xmit,
1292         .ndo_change_rx_flags    = team_change_rx_flags,
1293         .ndo_set_rx_mode        = team_set_rx_mode,
1294         .ndo_set_mac_address    = team_set_mac_address,
1295         .ndo_change_mtu         = team_change_mtu,
1296         .ndo_get_stats64        = team_get_stats64,
1297         .ndo_vlan_rx_add_vid    = team_vlan_rx_add_vid,
1298         .ndo_vlan_rx_kill_vid   = team_vlan_rx_kill_vid,
1299         .ndo_add_slave          = team_add_slave,
1300         .ndo_del_slave          = team_del_slave,
1301         .ndo_fix_features       = team_fix_features,
1302 };
1303
1304
1305 /***********************
1306  * rt netlink interface
1307  ***********************/
1308
1309 static void team_setup(struct net_device *dev)
1310 {
1311         ether_setup(dev);
1312
1313         dev->netdev_ops = &team_netdev_ops;
1314         dev->destructor = team_destructor;
1315         dev->tx_queue_len = 0;
1316         dev->flags |= IFF_MULTICAST;
1317         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
1318
1319         /*
1320          * Indicate we support unicast address filtering. That way core won't
1321          * bring us to promisc mode in case a unicast addr is added.
1322          * Let this up to underlay drivers.
1323          */
1324         dev->priv_flags |= IFF_UNICAST_FLT;
1325
1326         dev->features |= NETIF_F_LLTX;
1327         dev->features |= NETIF_F_GRO;
1328         dev->hw_features = NETIF_F_HW_VLAN_TX |
1329                            NETIF_F_HW_VLAN_RX |
1330                            NETIF_F_HW_VLAN_FILTER;
1331
1332         dev->features |= dev->hw_features;
1333 }
1334
1335 static int team_newlink(struct net *src_net, struct net_device *dev,
1336                         struct nlattr *tb[], struct nlattr *data[])
1337 {
1338         int err;
1339
1340         if (tb[IFLA_ADDRESS] == NULL)
1341                 eth_hw_addr_random(dev);
1342
1343         err = register_netdevice(dev);
1344         if (err)
1345                 return err;
1346
1347         return 0;
1348 }
1349
1350 static int team_validate(struct nlattr *tb[], struct nlattr *data[])
1351 {
1352         if (tb[IFLA_ADDRESS]) {
1353                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1354                         return -EINVAL;
1355                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1356                         return -EADDRNOTAVAIL;
1357         }
1358         return 0;
1359 }
1360
1361 static struct rtnl_link_ops team_link_ops __read_mostly = {
1362         .kind           = DRV_NAME,
1363         .priv_size      = sizeof(struct team),
1364         .setup          = team_setup,
1365         .newlink        = team_newlink,
1366         .validate       = team_validate,
1367 };
1368
1369
1370 /***********************************
1371  * Generic netlink custom interface
1372  ***********************************/
1373
1374 static struct genl_family team_nl_family = {
1375         .id             = GENL_ID_GENERATE,
1376         .name           = TEAM_GENL_NAME,
1377         .version        = TEAM_GENL_VERSION,
1378         .maxattr        = TEAM_ATTR_MAX,
1379         .netnsok        = true,
1380 };
1381
1382 static const struct nla_policy team_nl_policy[TEAM_ATTR_MAX + 1] = {
1383         [TEAM_ATTR_UNSPEC]                      = { .type = NLA_UNSPEC, },
1384         [TEAM_ATTR_TEAM_IFINDEX]                = { .type = NLA_U32 },
1385         [TEAM_ATTR_LIST_OPTION]                 = { .type = NLA_NESTED },
1386         [TEAM_ATTR_LIST_PORT]                   = { .type = NLA_NESTED },
1387 };
1388
1389 static const struct nla_policy
1390 team_nl_option_policy[TEAM_ATTR_OPTION_MAX + 1] = {
1391         [TEAM_ATTR_OPTION_UNSPEC]               = { .type = NLA_UNSPEC, },
1392         [TEAM_ATTR_OPTION_NAME] = {
1393                 .type = NLA_STRING,
1394                 .len = TEAM_STRING_MAX_LEN,
1395         },
1396         [TEAM_ATTR_OPTION_CHANGED]              = { .type = NLA_FLAG },
1397         [TEAM_ATTR_OPTION_TYPE]                 = { .type = NLA_U8 },
1398         [TEAM_ATTR_OPTION_DATA]                 = { .type = NLA_BINARY },
1399 };
1400
1401 static int team_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
1402 {
1403         struct sk_buff *msg;
1404         void *hdr;
1405         int err;
1406
1407         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1408         if (!msg)
1409                 return -ENOMEM;
1410
1411         hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq,
1412                           &team_nl_family, 0, TEAM_CMD_NOOP);
1413         if (IS_ERR(hdr)) {
1414                 err = PTR_ERR(hdr);
1415                 goto err_msg_put;
1416         }
1417
1418         genlmsg_end(msg, hdr);
1419
1420         return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
1421
1422 err_msg_put:
1423         nlmsg_free(msg);
1424
1425         return err;
1426 }
1427
1428 /*
1429  * Netlink cmd functions should be locked by following two functions.
1430  * Since dev gets held here, that ensures dev won't disappear in between.
1431  */
1432 static struct team *team_nl_team_get(struct genl_info *info)
1433 {
1434         struct net *net = genl_info_net(info);
1435         int ifindex;
1436         struct net_device *dev;
1437         struct team *team;
1438
1439         if (!info->attrs[TEAM_ATTR_TEAM_IFINDEX])
1440                 return NULL;
1441
1442         ifindex = nla_get_u32(info->attrs[TEAM_ATTR_TEAM_IFINDEX]);
1443         dev = dev_get_by_index(net, ifindex);
1444         if (!dev || dev->netdev_ops != &team_netdev_ops) {
1445                 if (dev)
1446                         dev_put(dev);
1447                 return NULL;
1448         }
1449
1450         team = netdev_priv(dev);
1451         mutex_lock(&team->lock);
1452         return team;
1453 }
1454
1455 static void team_nl_team_put(struct team *team)
1456 {
1457         mutex_unlock(&team->lock);
1458         dev_put(team->dev);
1459 }
1460
1461 static int team_nl_send_generic(struct genl_info *info, struct team *team,
1462                                 int (*fill_func)(struct sk_buff *skb,
1463                                                  struct genl_info *info,
1464                                                  int flags, struct team *team))
1465 {
1466         struct sk_buff *skb;
1467         int err;
1468
1469         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1470         if (!skb)
1471                 return -ENOMEM;
1472
1473         err = fill_func(skb, info, NLM_F_ACK, team);
1474         if (err < 0)
1475                 goto err_fill;
1476
1477         err = genlmsg_unicast(genl_info_net(info), skb, info->snd_pid);
1478         return err;
1479
1480 err_fill:
1481         nlmsg_free(skb);
1482         return err;
1483 }
1484
1485 static int team_nl_fill_options_get(struct sk_buff *skb,
1486                                     u32 pid, u32 seq, int flags,
1487                                     struct team *team, bool fillall)
1488 {
1489         struct nlattr *option_list;
1490         void *hdr;
1491         struct team_option_inst *opt_inst;
1492         int err;
1493
1494         hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags,
1495                           TEAM_CMD_OPTIONS_GET);
1496         if (IS_ERR(hdr))
1497                 return PTR_ERR(hdr);
1498
1499         if (nla_put_u32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex))
1500                 goto nla_put_failure;
1501         option_list = nla_nest_start(skb, TEAM_ATTR_LIST_OPTION);
1502         if (!option_list)
1503                 return -EMSGSIZE;
1504
1505         list_for_each_entry(opt_inst, &team->option_inst_list, list) {
1506                 struct nlattr *option_item;
1507                 struct team_option *option = opt_inst->option;
1508                 struct team_gsetter_ctx ctx;
1509
1510                 /* Include only changed options if fill all mode is not on */
1511                 if (!fillall && !opt_inst->changed)
1512                         continue;
1513                 option_item = nla_nest_start(skb, TEAM_ATTR_ITEM_OPTION);
1514                 if (!option_item)
1515                         goto nla_put_failure;
1516                 if (nla_put_string(skb, TEAM_ATTR_OPTION_NAME, option->name))
1517                         goto nla_put_failure;
1518                 if (opt_inst->changed) {
1519                         if (nla_put_flag(skb, TEAM_ATTR_OPTION_CHANGED))
1520                                 goto nla_put_failure;
1521                         opt_inst->changed = false;
1522                 }
1523                 if (opt_inst->removed &&
1524                     nla_put_flag(skb, TEAM_ATTR_OPTION_REMOVED))
1525                         goto nla_put_failure;
1526                 if (opt_inst->port &&
1527                     nla_put_u32(skb, TEAM_ATTR_OPTION_PORT_IFINDEX,
1528                                 opt_inst->port->dev->ifindex))
1529                         goto nla_put_failure;
1530                 ctx.port = opt_inst->port;
1531                 switch (option->type) {
1532                 case TEAM_OPTION_TYPE_U32:
1533                         if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_U32))
1534                                 goto nla_put_failure;
1535                         err = team_option_get(team, opt_inst, &ctx);
1536                         if (err)
1537                                 goto errout;
1538                         if (nla_put_u32(skb, TEAM_ATTR_OPTION_DATA,
1539                                         ctx.data.u32_val))
1540                                 goto nla_put_failure;
1541                         break;
1542                 case TEAM_OPTION_TYPE_STRING:
1543                         if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_STRING))
1544                                 goto nla_put_failure;
1545                         err = team_option_get(team, opt_inst, &ctx);
1546                         if (err)
1547                                 goto errout;
1548                         if (nla_put_string(skb, TEAM_ATTR_OPTION_DATA,
1549                                            ctx.data.str_val))
1550                                 goto nla_put_failure;
1551                         break;
1552                 case TEAM_OPTION_TYPE_BINARY:
1553                         if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_BINARY))
1554                                 goto nla_put_failure;
1555                         err = team_option_get(team, opt_inst, &ctx);
1556                         if (err)
1557                                 goto errout;
1558                         if (nla_put(skb, TEAM_ATTR_OPTION_DATA,
1559                                     ctx.data.bin_val.len, ctx.data.bin_val.ptr))
1560                                 goto nla_put_failure;
1561                         break;
1562                 case TEAM_OPTION_TYPE_BOOL:
1563                         if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_FLAG))
1564                                 goto nla_put_failure;
1565                         err = team_option_get(team, opt_inst, &ctx);
1566                         if (err)
1567                                 goto errout;
1568                         if (ctx.data.bool_val &&
1569                             nla_put_flag(skb, TEAM_ATTR_OPTION_DATA))
1570                                 goto nla_put_failure;
1571                         break;
1572                 default:
1573                         BUG();
1574                 }
1575                 nla_nest_end(skb, option_item);
1576         }
1577
1578         nla_nest_end(skb, option_list);
1579         return genlmsg_end(skb, hdr);
1580
1581 nla_put_failure:
1582         err = -EMSGSIZE;
1583 errout:
1584         genlmsg_cancel(skb, hdr);
1585         return err;
1586 }
1587
1588 static int team_nl_fill_options_get_all(struct sk_buff *skb,
1589                                         struct genl_info *info, int flags,
1590                                         struct team *team)
1591 {
1592         return team_nl_fill_options_get(skb, info->snd_pid,
1593                                         info->snd_seq, NLM_F_ACK,
1594                                         team, true);
1595 }
1596
1597 static int team_nl_cmd_options_get(struct sk_buff *skb, struct genl_info *info)
1598 {
1599         struct team *team;
1600         int err;
1601
1602         team = team_nl_team_get(info);
1603         if (!team)
1604                 return -EINVAL;
1605
1606         err = team_nl_send_generic(info, team, team_nl_fill_options_get_all);
1607
1608         team_nl_team_put(team);
1609
1610         return err;
1611 }
1612
1613 static int team_nl_cmd_options_set(struct sk_buff *skb, struct genl_info *info)
1614 {
1615         struct team *team;
1616         int err = 0;
1617         int i;
1618         struct nlattr *nl_option;
1619
1620         team = team_nl_team_get(info);
1621         if (!team)
1622                 return -EINVAL;
1623
1624         err = -EINVAL;
1625         if (!info->attrs[TEAM_ATTR_LIST_OPTION]) {
1626                 err = -EINVAL;
1627                 goto team_put;
1628         }
1629
1630         nla_for_each_nested(nl_option, info->attrs[TEAM_ATTR_LIST_OPTION], i) {
1631                 struct nlattr *opt_attrs[TEAM_ATTR_OPTION_MAX + 1];
1632                 struct nlattr *attr_port_ifindex;
1633                 struct nlattr *attr_data;
1634                 enum team_option_type opt_type;
1635                 int opt_port_ifindex = 0; /* != 0 for per-port options */
1636                 struct team_option_inst *opt_inst;
1637                 char *opt_name;
1638                 bool opt_found = false;
1639
1640                 if (nla_type(nl_option) != TEAM_ATTR_ITEM_OPTION) {
1641                         err = -EINVAL;
1642                         goto team_put;
1643                 }
1644                 err = nla_parse_nested(opt_attrs, TEAM_ATTR_OPTION_MAX,
1645                                        nl_option, team_nl_option_policy);
1646                 if (err)
1647                         goto team_put;
1648                 if (!opt_attrs[TEAM_ATTR_OPTION_NAME] ||
1649                     !opt_attrs[TEAM_ATTR_OPTION_TYPE]) {
1650                         err = -EINVAL;
1651                         goto team_put;
1652                 }
1653                 switch (nla_get_u8(opt_attrs[TEAM_ATTR_OPTION_TYPE])) {
1654                 case NLA_U32:
1655                         opt_type = TEAM_OPTION_TYPE_U32;
1656                         break;
1657                 case NLA_STRING:
1658                         opt_type = TEAM_OPTION_TYPE_STRING;
1659                         break;
1660                 case NLA_BINARY:
1661                         opt_type = TEAM_OPTION_TYPE_BINARY;
1662                         break;
1663                 case NLA_FLAG:
1664                         opt_type = TEAM_OPTION_TYPE_BOOL;
1665                         break;
1666                 default:
1667                         goto team_put;
1668                 }
1669
1670                 attr_data = opt_attrs[TEAM_ATTR_OPTION_DATA];
1671                 if (opt_type != TEAM_OPTION_TYPE_BOOL && !attr_data) {
1672                         err = -EINVAL;
1673                         goto team_put;
1674                 }
1675
1676                 opt_name = nla_data(opt_attrs[TEAM_ATTR_OPTION_NAME]);
1677                 attr_port_ifindex = opt_attrs[TEAM_ATTR_OPTION_PORT_IFINDEX];
1678                 if (attr_port_ifindex)
1679                         opt_port_ifindex = nla_get_u32(attr_port_ifindex);
1680
1681                 list_for_each_entry(opt_inst, &team->option_inst_list, list) {
1682                         struct team_option *option = opt_inst->option;
1683                         struct team_gsetter_ctx ctx;
1684                         int tmp_ifindex;
1685
1686                         tmp_ifindex = opt_inst->port ?
1687                                       opt_inst->port->dev->ifindex : 0;
1688                         if (option->type != opt_type ||
1689                             strcmp(option->name, opt_name) ||
1690                             tmp_ifindex != opt_port_ifindex)
1691                                 continue;
1692                         opt_found = true;
1693                         ctx.port = opt_inst->port;
1694                         switch (opt_type) {
1695                         case TEAM_OPTION_TYPE_U32:
1696                                 ctx.data.u32_val = nla_get_u32(attr_data);
1697                                 break;
1698                         case TEAM_OPTION_TYPE_STRING:
1699                                 if (nla_len(attr_data) > TEAM_STRING_MAX_LEN) {
1700                                         err = -EINVAL;
1701                                         goto team_put;
1702                                 }
1703                                 ctx.data.str_val = nla_data(attr_data);
1704                                 break;
1705                         case TEAM_OPTION_TYPE_BINARY:
1706                                 ctx.data.bin_val.len = nla_len(attr_data);
1707                                 ctx.data.bin_val.ptr = nla_data(attr_data);
1708                                 break;
1709                         case TEAM_OPTION_TYPE_BOOL:
1710                                 ctx.data.bool_val = attr_data ? true : false;
1711                                 break;
1712                         default:
1713                                 BUG();
1714                         }
1715                         err = team_option_set(team, opt_inst, &ctx);
1716                         if (err)
1717                                 goto team_put;
1718                 }
1719                 if (!opt_found) {
1720                         err = -ENOENT;
1721                         goto team_put;
1722                 }
1723         }
1724
1725 team_put:
1726         team_nl_team_put(team);
1727
1728         return err;
1729 }
1730
1731 static int team_nl_fill_port_list_get(struct sk_buff *skb,
1732                                       u32 pid, u32 seq, int flags,
1733                                       struct team *team,
1734                                       bool fillall)
1735 {
1736         struct nlattr *port_list;
1737         void *hdr;
1738         struct team_port *port;
1739
1740         hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags,
1741                           TEAM_CMD_PORT_LIST_GET);
1742         if (IS_ERR(hdr))
1743                 return PTR_ERR(hdr);
1744
1745         if (nla_put_u32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex))
1746                 goto nla_put_failure;
1747         port_list = nla_nest_start(skb, TEAM_ATTR_LIST_PORT);
1748         if (!port_list)
1749                 return -EMSGSIZE;
1750
1751         list_for_each_entry(port, &team->port_list, list) {
1752                 struct nlattr *port_item;
1753
1754                 /* Include only changed ports if fill all mode is not on */
1755                 if (!fillall && !port->changed)
1756                         continue;
1757                 port_item = nla_nest_start(skb, TEAM_ATTR_ITEM_PORT);
1758                 if (!port_item)
1759                         goto nla_put_failure;
1760                 if (nla_put_u32(skb, TEAM_ATTR_PORT_IFINDEX, port->dev->ifindex))
1761                         goto nla_put_failure;
1762                 if (port->changed) {
1763                         if (nla_put_flag(skb, TEAM_ATTR_PORT_CHANGED))
1764                                 goto nla_put_failure;
1765                         port->changed = false;
1766                 }
1767                 if ((port->removed &&
1768                      nla_put_flag(skb, TEAM_ATTR_PORT_REMOVED)) ||
1769                     (port->state.linkup &&
1770                      nla_put_flag(skb, TEAM_ATTR_PORT_LINKUP)) ||
1771                     nla_put_u32(skb, TEAM_ATTR_PORT_SPEED, port->state.speed) ||
1772                     nla_put_u8(skb, TEAM_ATTR_PORT_DUPLEX, port->state.duplex))
1773                         goto nla_put_failure;
1774                 nla_nest_end(skb, port_item);
1775         }
1776
1777         nla_nest_end(skb, port_list);
1778         return genlmsg_end(skb, hdr);
1779
1780 nla_put_failure:
1781         genlmsg_cancel(skb, hdr);
1782         return -EMSGSIZE;
1783 }
1784
1785 static int team_nl_fill_port_list_get_all(struct sk_buff *skb,
1786                                           struct genl_info *info, int flags,
1787                                           struct team *team)
1788 {
1789         return team_nl_fill_port_list_get(skb, info->snd_pid,
1790                                           info->snd_seq, NLM_F_ACK,
1791                                           team, true);
1792 }
1793
1794 static int team_nl_cmd_port_list_get(struct sk_buff *skb,
1795                                      struct genl_info *info)
1796 {
1797         struct team *team;
1798         int err;
1799
1800         team = team_nl_team_get(info);
1801         if (!team)
1802                 return -EINVAL;
1803
1804         err = team_nl_send_generic(info, team, team_nl_fill_port_list_get_all);
1805
1806         team_nl_team_put(team);
1807
1808         return err;
1809 }
1810
1811 static struct genl_ops team_nl_ops[] = {
1812         {
1813                 .cmd = TEAM_CMD_NOOP,
1814                 .doit = team_nl_cmd_noop,
1815                 .policy = team_nl_policy,
1816         },
1817         {
1818                 .cmd = TEAM_CMD_OPTIONS_SET,
1819                 .doit = team_nl_cmd_options_set,
1820                 .policy = team_nl_policy,
1821                 .flags = GENL_ADMIN_PERM,
1822         },
1823         {
1824                 .cmd = TEAM_CMD_OPTIONS_GET,
1825                 .doit = team_nl_cmd_options_get,
1826                 .policy = team_nl_policy,
1827                 .flags = GENL_ADMIN_PERM,
1828         },
1829         {
1830                 .cmd = TEAM_CMD_PORT_LIST_GET,
1831                 .doit = team_nl_cmd_port_list_get,
1832                 .policy = team_nl_policy,
1833                 .flags = GENL_ADMIN_PERM,
1834         },
1835 };
1836
1837 static struct genl_multicast_group team_change_event_mcgrp = {
1838         .name = TEAM_GENL_CHANGE_EVENT_MC_GRP_NAME,
1839 };
1840
1841 static int team_nl_send_event_options_get(struct team *team)
1842 {
1843         struct sk_buff *skb;
1844         int err;
1845         struct net *net = dev_net(team->dev);
1846
1847         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1848         if (!skb)
1849                 return -ENOMEM;
1850
1851         err = team_nl_fill_options_get(skb, 0, 0, 0, team, false);
1852         if (err < 0)
1853                 goto err_fill;
1854
1855         err = genlmsg_multicast_netns(net, skb, 0, team_change_event_mcgrp.id,
1856                                       GFP_KERNEL);
1857         return err;
1858
1859 err_fill:
1860         nlmsg_free(skb);
1861         return err;
1862 }
1863
1864 static int team_nl_send_event_port_list_get(struct team *team)
1865 {
1866         struct sk_buff *skb;
1867         int err;
1868         struct net *net = dev_net(team->dev);
1869
1870         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1871         if (!skb)
1872                 return -ENOMEM;
1873
1874         err = team_nl_fill_port_list_get(skb, 0, 0, 0, team, false);
1875         if (err < 0)
1876                 goto err_fill;
1877
1878         err = genlmsg_multicast_netns(net, skb, 0, team_change_event_mcgrp.id,
1879                                       GFP_KERNEL);
1880         return err;
1881
1882 err_fill:
1883         nlmsg_free(skb);
1884         return err;
1885 }
1886
1887 static int team_nl_init(void)
1888 {
1889         int err;
1890
1891         err = genl_register_family_with_ops(&team_nl_family, team_nl_ops,
1892                                             ARRAY_SIZE(team_nl_ops));
1893         if (err)
1894                 return err;
1895
1896         err = genl_register_mc_group(&team_nl_family, &team_change_event_mcgrp);
1897         if (err)
1898                 goto err_change_event_grp_reg;
1899
1900         return 0;
1901
1902 err_change_event_grp_reg:
1903         genl_unregister_family(&team_nl_family);
1904
1905         return err;
1906 }
1907
1908 static void team_nl_fini(void)
1909 {
1910         genl_unregister_family(&team_nl_family);
1911 }
1912
1913
1914 /******************
1915  * Change checkers
1916  ******************/
1917
1918 static void __team_options_change_check(struct team *team)
1919 {
1920         int err;
1921
1922         err = team_nl_send_event_options_get(team);
1923         if (err)
1924                 netdev_warn(team->dev, "Failed to send options change via netlink\n");
1925 }
1926
1927 /* rtnl lock is held */
1928 static void __team_port_change_check(struct team_port *port, bool linkup)
1929 {
1930         int err;
1931
1932         if (!port->removed && port->state.linkup == linkup)
1933                 return;
1934
1935         port->changed = true;
1936         port->state.linkup = linkup;
1937         team_refresh_port_linkup(port);
1938         if (linkup) {
1939                 struct ethtool_cmd ecmd;
1940
1941                 err = __ethtool_get_settings(port->dev, &ecmd);
1942                 if (!err) {
1943                         port->state.speed = ethtool_cmd_speed(&ecmd);
1944                         port->state.duplex = ecmd.duplex;
1945                         goto send_event;
1946                 }
1947         }
1948         port->state.speed = 0;
1949         port->state.duplex = 0;
1950
1951 send_event:
1952         err = team_nl_send_event_port_list_get(port->team);
1953         if (err)
1954                 netdev_warn(port->team->dev, "Failed to send port change of device %s via netlink\n",
1955                             port->dev->name);
1956
1957 }
1958
1959 static void team_port_change_check(struct team_port *port, bool linkup)
1960 {
1961         struct team *team = port->team;
1962
1963         mutex_lock(&team->lock);
1964         __team_port_change_check(port, linkup);
1965         mutex_unlock(&team->lock);
1966 }
1967
1968 /************************************
1969  * Net device notifier event handler
1970  ************************************/
1971
1972 static int team_device_event(struct notifier_block *unused,
1973                              unsigned long event, void *ptr)
1974 {
1975         struct net_device *dev = (struct net_device *) ptr;
1976         struct team_port *port;
1977
1978         port = team_port_get_rtnl(dev);
1979         if (!port)
1980                 return NOTIFY_DONE;
1981
1982         switch (event) {
1983         case NETDEV_UP:
1984                 if (netif_carrier_ok(dev))
1985                         team_port_change_check(port, true);
1986         case NETDEV_DOWN:
1987                 team_port_change_check(port, false);
1988         case NETDEV_CHANGE:
1989                 if (netif_running(port->dev))
1990                         team_port_change_check(port,
1991                                                !!netif_carrier_ok(port->dev));
1992                 break;
1993         case NETDEV_UNREGISTER:
1994                 team_del_slave(port->team->dev, dev);
1995                 break;
1996         case NETDEV_FEAT_CHANGE:
1997                 team_compute_features(port->team);
1998                 break;
1999         case NETDEV_CHANGEMTU:
2000                 /* Forbid to change mtu of underlaying device */
2001                 return NOTIFY_BAD;
2002         case NETDEV_PRE_TYPE_CHANGE:
2003                 /* Forbid to change type of underlaying device */
2004                 return NOTIFY_BAD;
2005         }
2006         return NOTIFY_DONE;
2007 }
2008
2009 static struct notifier_block team_notifier_block __read_mostly = {
2010         .notifier_call = team_device_event,
2011 };
2012
2013
2014 /***********************
2015  * Module init and exit
2016  ***********************/
2017
2018 static int __init team_module_init(void)
2019 {
2020         int err;
2021
2022         register_netdevice_notifier(&team_notifier_block);
2023
2024         err = rtnl_link_register(&team_link_ops);
2025         if (err)
2026                 goto err_rtnl_reg;
2027
2028         err = team_nl_init();
2029         if (err)
2030                 goto err_nl_init;
2031
2032         return 0;
2033
2034 err_nl_init:
2035         rtnl_link_unregister(&team_link_ops);
2036
2037 err_rtnl_reg:
2038         unregister_netdevice_notifier(&team_notifier_block);
2039
2040         return err;
2041 }
2042
2043 static void __exit team_module_exit(void)
2044 {
2045         team_nl_fini();
2046         rtnl_link_unregister(&team_link_ops);
2047         unregister_netdevice_notifier(&team_notifier_block);
2048 }
2049
2050 module_init(team_module_init);
2051 module_exit(team_module_exit);
2052
2053 MODULE_LICENSE("GPL v2");
2054 MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
2055 MODULE_DESCRIPTION("Ethernet team device driver");
2056 MODULE_ALIAS_RTNL_LINK(DRV_NAME);