net/switchdev/switchdev.c

   1 /*
   2  * net/switchdev/switchdev.c - Switch device API
   3  * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
   4  * Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/types.h>
  14 #include <linux/init.h>
  15 #include <linux/mutex.h>
  16 #include <linux/notifier.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/if_bridge.h>
  19 #include <net/ip_fib.h>
  20 #include <net/switchdev.h>
  21
  22 /**
  23  *      switchdev_port_attr_get - Get port attribute
  24  *
  25  *      @dev: port device
  26  *      @attr: attribute to get
  27  */
  28 int switchdev_port_attr_get(struct net_device *dev, struct switchdev_attr *attr)
  29 {
  30         const struct switchdev_ops *ops = dev->switchdev_ops;
  31         struct net_device *lower_dev;
  32         struct list_head *iter;
  33         struct switchdev_attr first = {
  34                 .id = SWITCHDEV_ATTR_UNDEFINED
  35         };
  36         int err = -EOPNOTSUPP;
  37
  38         if (ops && ops->switchdev_port_attr_get)
  39                 return ops->switchdev_port_attr_get(dev, attr);
  40
  41         if (attr->flags & SWITCHDEV_F_NO_RECURSE)
  42                 return err;
  43
  44         /* Switch device port(s) may be stacked under
  45          * bond/team/vlan dev, so recurse down to get attr on
  46          * each port.  Return -ENODATA if attr values don't
  47          * compare across ports.
  48          */
  49
  50         netdev_for_each_lower_dev(dev, lower_dev, iter) {
  51                 err = switchdev_port_attr_get(lower_dev, attr);
  52                 if (err)
  53                         break;
  54                 if (first.id == SWITCHDEV_ATTR_UNDEFINED)
  55                         first = *attr;
  56                 else if (memcmp(&first, attr, sizeof(*attr)))
  57                         return -ENODATA;
  58         }
  59
  60         return err;
  61 }
  62 EXPORT_SYMBOL_GPL(switchdev_port_attr_get);
  63
  64 static int __switchdev_port_attr_set(struct net_device *dev,
  65                                      struct switchdev_attr *attr)
  66 {
  67         const struct switchdev_ops *ops = dev->switchdev_ops;
  68         struct net_device *lower_dev;
  69         struct list_head *iter;
  70         int err = -EOPNOTSUPP;
  71
  72         if (ops && ops->switchdev_port_attr_set)
  73                 return ops->switchdev_port_attr_set(dev, attr);
  74
  75         if (attr->flags & SWITCHDEV_F_NO_RECURSE)
  76                 return err;
  77
  78         /* Switch device port(s) may be stacked under
  79          * bond/team/vlan dev, so recurse down to set attr on
  80          * each port.
  81          */
  82
  83         netdev_for_each_lower_dev(dev, lower_dev, iter) {
  84                 err = __switchdev_port_attr_set(lower_dev, attr);
  85                 if (err)
  86                         break;
  87         }
  88
  89         return err;
  90 }
  91
  92 struct switchdev_attr_set_work {
  93         struct work_struct work;
  94         struct net_device *dev;
  95         struct switchdev_attr attr;
  96 };
  97
  98 static void switchdev_port_attr_set_work(struct work_struct *work)
  99 {
 100         struct switchdev_attr_set_work *asw =
 101                 container_of(work, struct switchdev_attr_set_work, work);
 102         int err;
 103
 104         rtnl_lock();
 105         err = switchdev_port_attr_set(asw->dev, &asw->attr);
 106         if (err && err != -EOPNOTSUPP)
 107                 netdev_err(asw->dev, "failed (err=%d) to set attribute (id=%d)\n",
 108                            err, asw->attr.id);
 109         rtnl_unlock();
 110
 111         dev_put(asw->dev);
 112         kfree(work);
 113 }
 114
 115 static int switchdev_port_attr_set_defer(struct net_device *dev,
 116                                          struct switchdev_attr *attr)
 117 {
 118         struct switchdev_attr_set_work *asw;
 119
 120         asw = kmalloc(sizeof(*asw), GFP_ATOMIC);
 121         if (!asw)
 122                 return -ENOMEM;
 123
 124         INIT_WORK(&asw->work, switchdev_port_attr_set_work);
 125
 126         dev_hold(dev);
 127         asw->dev = dev;
 128         memcpy(&asw->attr, attr, sizeof(asw->attr));
 129
 130         schedule_work(&asw->work);
 131
 132         return 0;
 133 }
 134
 135 /**
 136  *      switchdev_port_attr_set - Set port attribute
 137  *
 138  *      @dev: port device
 139  *      @attr: attribute to set
 140  *
 141  *      Use a 2-phase prepare-commit transaction model to ensure
 142  *      system is not left in a partially updated state due to
 143  *      failure from driver/device.
 144  */
 145 int switchdev_port_attr_set(struct net_device *dev, struct switchdev_attr *attr)
 146 {
 147         int err;
 148
 149         if (!rtnl_is_locked()) {
 150                 /* Running prepare-commit transaction across stacked
 151                  * devices requires nothing moves, so if rtnl_lock is
 152                  * not held, schedule a worker thread to hold rtnl_lock
 153                  * while setting attr.
 154                  */
 155
 156                 return switchdev_port_attr_set_defer(dev, attr);
 157         }
 158
 159         /* Phase I: prepare for attr set. Driver/device should fail
 160          * here if there are going to be issues in the commit phase,
 161          * such as lack of resources or support.  The driver/device
 162          * should reserve resources needed for the commit phase here,
 163          * but should not commit the attr.
 164          */
 165
 166         attr->trans = SWITCHDEV_TRANS_PREPARE;
 167         err = __switchdev_port_attr_set(dev, attr);
 168         if (err) {
 169                 /* Prepare phase failed: abort the transaction.  Any
 170                  * resources reserved in the prepare phase are
 171                  * released.
 172                  */
 173
 174                 attr->trans = SWITCHDEV_TRANS_ABORT;
 175                 __switchdev_port_attr_set(dev, attr);
 176
 177                 return err;
 178         }
 179
 180         /* Phase II: commit attr set.  This cannot fail as a fault
 181          * of driver/device.  If it does, it's a bug in the driver/device
 182          * because the driver said everythings was OK in phase I.
 183          */
 184
 185         attr->trans = SWITCHDEV_TRANS_COMMIT;
 186         err = __switchdev_port_attr_set(dev, attr);
 187         WARN(err, "%s: Commit of attribute (id=%d) failed.\n",
 188              dev->name, attr->id);
 189
 190         return err;
 191 }
 192 EXPORT_SYMBOL_GPL(switchdev_port_attr_set);
 193
 194 static int __switchdev_port_obj_add(struct net_device *dev,
 195                                     struct switchdev_obj *obj)
 196 {
 197         const struct switchdev_ops *ops = dev->switchdev_ops;
 198         struct net_device *lower_dev;
 199         struct list_head *iter;
 200         int err = -EOPNOTSUPP;
 201
 202         if (ops && ops->switchdev_port_obj_add)
 203                 return ops->switchdev_port_obj_add(dev, obj);
 204
 205         /* Switch device port(s) may be stacked under
 206          * bond/team/vlan dev, so recurse down to add object on
 207          * each port.
 208          */
 209
 210         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 211                 err = __switchdev_port_obj_add(lower_dev, obj);
 212                 if (err)
 213                         break;
 214         }
 215
 216         return err;
 217 }
 218
 219 /**
 220  *      switchdev_port_obj_add - Add port object
 221  *
 222  *      @dev: port device
 223  *      @obj: object to add
 224  *
 225  *      Use a 2-phase prepare-commit transaction model to ensure
 226  *      system is not left in a partially updated state due to
 227  *      failure from driver/device.
 228  *
 229  *      rtnl_lock must be held.
 230  */
 231 int switchdev_port_obj_add(struct net_device *dev, struct switchdev_obj *obj)
 232 {
 233         int err;
 234
 235         ASSERT_RTNL();
 236
 237         /* Phase I: prepare for obj add. Driver/device should fail
 238          * here if there are going to be issues in the commit phase,
 239          * such as lack of resources or support.  The driver/device
 240          * should reserve resources needed for the commit phase here,
 241          * but should not commit the obj.
 242          */
 243
 244         obj->trans = SWITCHDEV_TRANS_PREPARE;
 245         err = __switchdev_port_obj_add(dev, obj);
 246         if (err) {
 247                 /* Prepare phase failed: abort the transaction.  Any
 248                  * resources reserved in the prepare phase are
 249                  * released.
 250                  */
 251
 252                 obj->trans = SWITCHDEV_TRANS_ABORT;
 253                 __switchdev_port_obj_add(dev, obj);
 254
 255                 return err;
 256         }
 257
 258         /* Phase II: commit obj add.  This cannot fail as a fault
 259          * of driver/device.  If it does, it's a bug in the driver/device
 260          * because the driver said everythings was OK in phase I.
 261          */
 262
 263         obj->trans = SWITCHDEV_TRANS_COMMIT;
 264         err = __switchdev_port_obj_add(dev, obj);
 265         WARN(err, "%s: Commit of object (id=%d) failed.\n", dev->name, obj->id);
 266
 267         return err;
 268 }
 269 EXPORT_SYMBOL_GPL(switchdev_port_obj_add);
 270
 271 /**
 272  *      switchdev_port_obj_del - Delete port object
 273  *
 274  *      @dev: port device
 275  *      @obj: object to delete
 276  */
 277 int switchdev_port_obj_del(struct net_device *dev, struct switchdev_obj *obj)
 278 {
 279         const struct switchdev_ops *ops = dev->switchdev_ops;
 280         struct net_device *lower_dev;
 281         struct list_head *iter;
 282         int err = -EOPNOTSUPP;
 283
 284         if (ops && ops->switchdev_port_obj_del)
 285                 return ops->switchdev_port_obj_del(dev, obj);
 286
 287         /* Switch device port(s) may be stacked under
 288          * bond/team/vlan dev, so recurse down to delete object on
 289          * each port.
 290          */
 291
 292         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 293                 err = switchdev_port_obj_del(lower_dev, obj);
 294                 if (err)
 295                         break;
 296         }
 297
 298         return err;
 299 }
 300 EXPORT_SYMBOL_GPL(switchdev_port_obj_del);
 301
 302 /**
 303  *      switchdev_port_obj_dump - Dump port objects
 304  *
 305  *      @dev: port device
 306  *      @obj: object to dump
 307  */
 308 int switchdev_port_obj_dump(struct net_device *dev, struct switchdev_obj *obj)
 309 {
 310         const struct switchdev_ops *ops = dev->switchdev_ops;
 311         struct net_device *lower_dev;
 312         struct list_head *iter;
 313         int err = -EOPNOTSUPP;
 314
 315         if (ops && ops->switchdev_port_obj_dump)
 316                 return ops->switchdev_port_obj_dump(dev, obj);
 317
 318         /* Switch device port(s) may be stacked under
 319          * bond/team/vlan dev, so recurse down to dump objects on
 320          * first port at bottom of stack.
 321          */
 322
 323         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 324                 err = switchdev_port_obj_dump(lower_dev, obj);
 325                 break;
 326         }
 327
 328         return err;
 329 }
 330 EXPORT_SYMBOL_GPL(switchdev_port_obj_dump);
 331
 332 static DEFINE_MUTEX(switchdev_mutex);
 333 static RAW_NOTIFIER_HEAD(switchdev_notif_chain);
 334
 335 /**
 336  *      register_switchdev_notifier - Register notifier
 337  *      @nb: notifier_block
 338  *
 339  *      Register switch device notifier. This should be used by code
 340  *      which needs to monitor events happening in particular device.
 341  *      Return values are same as for atomic_notifier_chain_register().
 342  */
 343 int register_switchdev_notifier(struct notifier_block *nb)
 344 {
 345         int err;
 346
 347         mutex_lock(&switchdev_mutex);
 348         err = raw_notifier_chain_register(&switchdev_notif_chain, nb);
 349         mutex_unlock(&switchdev_mutex);
 350         return err;
 351 }
 352 EXPORT_SYMBOL_GPL(register_switchdev_notifier);
 353
 354 /**
 355  *      unregister_switchdev_notifier - Unregister notifier
 356  *      @nb: notifier_block
 357  *
 358  *      Unregister switch device notifier.
 359  *      Return values are same as for atomic_notifier_chain_unregister().
 360  */
 361 int unregister_switchdev_notifier(struct notifier_block *nb)
 362 {
 363         int err;
 364
 365         mutex_lock(&switchdev_mutex);
 366         err = raw_notifier_chain_unregister(&switchdev_notif_chain, nb);
 367         mutex_unlock(&switchdev_mutex);
 368         return err;
 369 }
 370 EXPORT_SYMBOL_GPL(unregister_switchdev_notifier);
 371
 372 /**
 373  *      call_switchdev_notifiers - Call notifiers
 374  *      @val: value passed unmodified to notifier function
 375  *      @dev: port device
 376  *      @info: notifier information data
 377  *
 378  *      Call all network notifier blocks. This should be called by driver
 379  *      when it needs to propagate hardware event.
 380  *      Return values are same as for atomic_notifier_call_chain().
 381  */
 382 int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
 383                              struct switchdev_notifier_info *info)
 384 {
 385         int err;
 386
 387         info->dev = dev;
 388         mutex_lock(&switchdev_mutex);
 389         err = raw_notifier_call_chain(&switchdev_notif_chain, val, info);
 390         mutex_unlock(&switchdev_mutex);
 391         return err;
 392 }
 393 EXPORT_SYMBOL_GPL(call_switchdev_notifiers);
 394
 395 struct switchdev_vlan_dump {
 396         struct switchdev_obj obj;
 397         struct sk_buff *skb;
 398         u32 filter_mask;
 399         u16 flags;
 400         u16 begin;
 401         u16 end;
 402 };
 403
 404 static int switchdev_port_vlan_dump_put(struct net_device *dev,
 405                                         struct switchdev_vlan_dump *dump)
 406 {
 407         struct bridge_vlan_info vinfo;
 408
 409         vinfo.flags = dump->flags;
 410
 411         if (dump->begin == 0 && dump->end == 0) {
 412                 return 0;
 413         } else if (dump->begin == dump->end) {
 414                 vinfo.vid = dump->begin;
 415                 if (nla_put(dump->skb, IFLA_BRIDGE_VLAN_INFO,
 416                             sizeof(vinfo), &vinfo))
 417                         return -EMSGSIZE;
 418         } else {
 419                 vinfo.vid = dump->begin;
 420                 vinfo.flags |= BRIDGE_VLAN_INFO_RANGE_BEGIN;
 421                 if (nla_put(dump->skb, IFLA_BRIDGE_VLAN_INFO,
 422                             sizeof(vinfo), &vinfo))
 423                         return -EMSGSIZE;
 424                 vinfo.vid = dump->end;
 425                 vinfo.flags &= ~BRIDGE_VLAN_INFO_RANGE_BEGIN;
 426                 vinfo.flags |= BRIDGE_VLAN_INFO_RANGE_END;
 427                 if (nla_put(dump->skb, IFLA_BRIDGE_VLAN_INFO,
 428                             sizeof(vinfo), &vinfo))
 429                         return -EMSGSIZE;
 430         }
 431
 432         return 0;
 433 }
 434
 435 static int switchdev_port_vlan_dump_cb(struct net_device *dev,
 436                                        struct switchdev_obj *obj)
 437 {
 438         struct switchdev_vlan_dump *dump =
 439                 container_of(obj, struct switchdev_vlan_dump, obj);
 440         struct switchdev_obj_vlan *vlan = &dump->obj.u.vlan;
 441         int err = 0;
 442
 443         if (vlan->vid_begin > vlan->vid_end)
 444                 return -EINVAL;
 445
 446         if (dump->filter_mask & RTEXT_FILTER_BRVLAN) {
 447                 dump->flags = vlan->flags;
 448                 for (dump->begin = dump->end = vlan->vid_begin;
 449                      dump->begin <= vlan->vid_end;
 450                      dump->begin++, dump->end++) {
 451                         err = switchdev_port_vlan_dump_put(dev, dump);
 452                         if (err)
 453                                 return err;
 454                 }
 455         } else if (dump->filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED) {
 456                 if (dump->begin > vlan->vid_begin &&
 457                     dump->begin >= vlan->vid_end) {
 458                         if ((dump->begin - 1) == vlan->vid_end &&
 459                             dump->flags == vlan->flags) {
 460                                 /* prepend */
 461                                 dump->begin = vlan->vid_begin;
 462                         } else {
 463                                 err = switchdev_port_vlan_dump_put(dev, dump);
 464                                 dump->flags = vlan->flags;
 465                                 dump->begin = vlan->vid_begin;
 466                                 dump->end = vlan->vid_end;
 467                         }
 468                 } else if (dump->end <= vlan->vid_begin &&
 469                            dump->end < vlan->vid_end) {
 470                         if ((dump->end  + 1) == vlan->vid_begin &&
 471                             dump->flags == vlan->flags) {
 472                                 /* append */
 473                                 dump->end = vlan->vid_end;
 474                         } else {
 475                                 err = switchdev_port_vlan_dump_put(dev, dump);
 476                                 dump->flags = vlan->flags;
 477                                 dump->begin = vlan->vid_begin;
 478                                 dump->end = vlan->vid_end;
 479                         }
 480                 } else {
 481                         err = -EINVAL;
 482                 }
 483         }
 484
 485         return err;
 486 }
 487
 488 static int switchdev_port_vlan_fill(struct sk_buff *skb, struct net_device *dev,
 489                                     u32 filter_mask)
 490 {
 491         struct switchdev_vlan_dump dump = {
 492                 .obj = {
 493                         .id = SWITCHDEV_OBJ_PORT_VLAN,
 494                         .cb = switchdev_port_vlan_dump_cb,
 495                 },
 496                 .skb = skb,
 497                 .filter_mask = filter_mask,
 498         };
 499         int err = 0;
 500
 501         if ((filter_mask & RTEXT_FILTER_BRVLAN) ||
 502             (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) {
 503                 err = switchdev_port_obj_dump(dev, &dump.obj);
 504                 if (err)
 505                         goto err_out;
 506                 if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)
 507                         /* last one */
 508                         err = switchdev_port_vlan_dump_put(dev, &dump);
 509         }
 510
 511 err_out:
 512         return err == -EOPNOTSUPP ? 0 : err;
 513 }
 514
 515 /**
 516  *      switchdev_port_bridge_getlink - Get bridge port attributes
 517  *
 518  *      @dev: port device
 519  *
 520  *      Called for SELF on rtnl_bridge_getlink to get bridge port
 521  *      attributes.
 522  */
 523 int switchdev_port_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 524                                   struct net_device *dev, u32 filter_mask,
 525                                   int nlflags)
 526 {
 527         struct switchdev_attr attr = {
 528                 .id = SWITCHDEV_ATTR_PORT_BRIDGE_FLAGS,
 529         };
 530         u16 mode = BRIDGE_MODE_UNDEF;
 531         u32 mask = BR_LEARNING | BR_LEARNING_SYNC;
 532         int err;
 533
 534         err = switchdev_port_attr_get(dev, &attr);
 535         if (err && err != -EOPNOTSUPP)
 536                 return err;
 537
 538         return ndo_dflt_bridge_getlink(skb, pid, seq, dev, mode,
 539                                        attr.u.brport_flags, mask, nlflags,
 540                                        filter_mask, switchdev_port_vlan_fill);
 541 }
 542 EXPORT_SYMBOL_GPL(switchdev_port_bridge_getlink);
 543
 544 static int switchdev_port_br_setflag(struct net_device *dev,
 545                                      struct nlattr *nlattr,
 546                                      unsigned long brport_flag)
 547 {
 548         struct switchdev_attr attr = {
 549                 .id = SWITCHDEV_ATTR_PORT_BRIDGE_FLAGS,
 550         };
 551         u8 flag = nla_get_u8(nlattr);
 552         int err;
 553
 554         err = switchdev_port_attr_get(dev, &attr);
 555         if (err)
 556                 return err;
 557
 558         if (flag)
 559                 attr.u.brport_flags |= brport_flag;
 560         else
 561                 attr.u.brport_flags &= ~brport_flag;
 562
 563         return switchdev_port_attr_set(dev, &attr);
 564 }
 565
 566 static const struct nla_policy
 567 switchdev_port_bridge_policy[IFLA_BRPORT_MAX + 1] = {
 568         [IFLA_BRPORT_STATE]             = { .type = NLA_U8 },
 569         [IFLA_BRPORT_COST]              = { .type = NLA_U32 },
 570         [IFLA_BRPORT_PRIORITY]          = { .type = NLA_U16 },
 571         [IFLA_BRPORT_MODE]              = { .type = NLA_U8 },
 572         [IFLA_BRPORT_GUARD]             = { .type = NLA_U8 },
 573         [IFLA_BRPORT_PROTECT]           = { .type = NLA_U8 },
 574         [IFLA_BRPORT_FAST_LEAVE]        = { .type = NLA_U8 },
 575         [IFLA_BRPORT_LEARNING]          = { .type = NLA_U8 },
 576         [IFLA_BRPORT_LEARNING_SYNC]     = { .type = NLA_U8 },
 577         [IFLA_BRPORT_UNICAST_FLOOD]     = { .type = NLA_U8 },
 578 };
 579
 580 static int switchdev_port_br_setlink_protinfo(struct net_device *dev,
 581                                               struct nlattr *protinfo)
 582 {
 583         struct nlattr *attr;
 584         int rem;
 585         int err;
 586
 587         err = nla_validate_nested(protinfo, IFLA_BRPORT_MAX,
 588                                   switchdev_port_bridge_policy);
 589         if (err)
 590                 return err;
 591
 592         nla_for_each_nested(attr, protinfo, rem) {
 593                 switch (nla_type(attr)) {
 594                 case IFLA_BRPORT_LEARNING:
 595                         err = switchdev_port_br_setflag(dev, attr,
 596                                                         BR_LEARNING);
 597                         break;
 598                 case IFLA_BRPORT_LEARNING_SYNC:
 599                         err = switchdev_port_br_setflag(dev, attr,
 600                                                         BR_LEARNING_SYNC);
 601                         break;
 602                 default:
 603                         err = -EOPNOTSUPP;
 604                         break;
 605                 }
 606                 if (err)
 607                         return err;
 608         }
 609
 610         return 0;
 611 }
 612
 613 static int switchdev_port_br_afspec(struct net_device *dev,
 614                                     struct nlattr *afspec,
 615                                     int (*f)(struct net_device *dev,
 616                                              struct switchdev_obj *obj))
 617 {
 618         struct nlattr *attr;
 619         struct bridge_vlan_info *vinfo;
 620         struct switchdev_obj obj = {
 621                 .id = SWITCHDEV_OBJ_PORT_VLAN,
 622         };
 623         struct switchdev_obj_vlan *vlan = &obj.u.vlan;
 624         int rem;
 625         int err;
 626
 627         nla_for_each_nested(attr, afspec, rem) {
 628                 if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO)
 629                         continue;
 630                 if (nla_len(attr) != sizeof(struct bridge_vlan_info))
 631                         return -EINVAL;
 632                 vinfo = nla_data(attr);
 633                 vlan->flags = vinfo->flags;
 634                 if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
 635                         if (vlan->vid_begin)
 636                                 return -EINVAL;
 637                         vlan->vid_begin = vinfo->vid;
 638                 } else if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END) {
 639                         if (!vlan->vid_begin)
 640                                 return -EINVAL;
 641                         vlan->vid_end = vinfo->vid;
 642                         if (vlan->vid_end <= vlan->vid_begin)
 643                                 return -EINVAL;
 644                         err = f(dev, &obj);
 645                         if (err)
 646                                 return err;
 647                         memset(vlan, 0, sizeof(*vlan));
 648                 } else {
 649                         if (vlan->vid_begin)
 650                                 return -EINVAL;
 651                         vlan->vid_begin = vinfo->vid;
 652                         vlan->vid_end = vinfo->vid;
 653                         err = f(dev, &obj);
 654                         if (err)
 655                                 return err;
 656                         memset(vlan, 0, sizeof(*vlan));
 657                 }
 658         }
 659
 660         return 0;
 661 }
 662
 663 /**
 664  *      switchdev_port_bridge_setlink - Set bridge port attributes
 665  *
 666  *      @dev: port device
 667  *      @nlh: netlink header
 668  *      @flags: netlink flags
 669  *
 670  *      Called for SELF on rtnl_bridge_setlink to set bridge port
 671  *      attributes.
 672  */
 673 int switchdev_port_bridge_setlink(struct net_device *dev,
 674                                   struct nlmsghdr *nlh, u16 flags)
 675 {
 676         struct nlattr *protinfo;
 677         struct nlattr *afspec;
 678         int err = 0;
 679
 680         protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
 681                                    IFLA_PROTINFO);
 682         if (protinfo) {
 683                 err = switchdev_port_br_setlink_protinfo(dev, protinfo);
 684                 if (err)
 685                         return err;
 686         }
 687
 688         afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
 689                                  IFLA_AF_SPEC);
 690         if (afspec)
 691                 err = switchdev_port_br_afspec(dev, afspec,
 692                                                switchdev_port_obj_add);
 693
 694         return err;
 695 }
 696 EXPORT_SYMBOL_GPL(switchdev_port_bridge_setlink);
 697
 698 /**
 699  *      switchdev_port_bridge_dellink - Set bridge port attributes
 700  *
 701  *      @dev: port device
 702  *      @nlh: netlink header
 703  *      @flags: netlink flags
 704  *
 705  *      Called for SELF on rtnl_bridge_dellink to set bridge port
 706  *      attributes.
 707  */
 708 int switchdev_port_bridge_dellink(struct net_device *dev,
 709                                   struct nlmsghdr *nlh, u16 flags)
 710 {
 711         struct nlattr *afspec;
 712
 713         afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
 714                                  IFLA_AF_SPEC);
 715         if (afspec)
 716                 return switchdev_port_br_afspec(dev, afspec,
 717                                                 switchdev_port_obj_del);
 718
 719         return 0;
 720 }
 721 EXPORT_SYMBOL_GPL(switchdev_port_bridge_dellink);
 722
 723 /**
 724  *      switchdev_port_fdb_add - Add FDB (MAC/VLAN) entry to port
 725  *
 726  *      @ndmsg: netlink hdr
 727  *      @nlattr: netlink attributes
 728  *      @dev: port device
 729  *      @addr: MAC address to add
 730  *      @vid: VLAN to add
 731  *
 732  *      Add FDB entry to switch device.
 733  */
 734 int switchdev_port_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 735                            struct net_device *dev, const unsigned char *addr,
 736                            u16 vid, u16 nlm_flags)
 737 {
 738         struct switchdev_obj obj = {
 739                 .id = SWITCHDEV_OBJ_PORT_FDB,
 740                 .u.fdb = {
 741                         .addr = addr,
 742                         .vid = vid,
 743                 },
 744         };
 745
 746         return switchdev_port_obj_add(dev, &obj);
 747 }
 748 EXPORT_SYMBOL_GPL(switchdev_port_fdb_add);
 749
 750 /**
 751  *      switchdev_port_fdb_del - Delete FDB (MAC/VLAN) entry from port
 752  *
 753  *      @ndmsg: netlink hdr
 754  *      @nlattr: netlink attributes
 755  *      @dev: port device
 756  *      @addr: MAC address to delete
 757  *      @vid: VLAN to delete
 758  *
 759  *      Delete FDB entry from switch device.
 760  */
 761 int switchdev_port_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
 762                            struct net_device *dev, const unsigned char *addr,
 763                            u16 vid)
 764 {
 765         struct switchdev_obj obj = {
 766                 .id = SWITCHDEV_OBJ_PORT_FDB,
 767                 .u.fdb = {
 768                         .addr = addr,
 769                         .vid = vid,
 770                 },
 771         };
 772
 773         return switchdev_port_obj_del(dev, &obj);
 774 }
 775 EXPORT_SYMBOL_GPL(switchdev_port_fdb_del);
 776
 777 struct switchdev_fdb_dump {
 778         struct switchdev_obj obj;
 779         struct sk_buff *skb;
 780         struct netlink_callback *cb;
 781         int idx;
 782 };
 783
 784 static int switchdev_port_fdb_dump_cb(struct net_device *dev,
 785                                       struct switchdev_obj *obj)
 786 {
 787         struct switchdev_fdb_dump *dump =
 788                 container_of(obj, struct switchdev_fdb_dump, obj);
 789         u32 portid = NETLINK_CB(dump->cb->skb).portid;
 790         u32 seq = dump->cb->nlh->nlmsg_seq;
 791         struct nlmsghdr *nlh;
 792         struct ndmsg *ndm;
 793
 794         if (dump->idx < dump->cb->args[0])
 795                 goto skip;
 796
 797         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
 798                         sizeof(*ndm), NLM_F_MULTI);
 799         if (!nlh)
 800                 return -EMSGSIZE;
 801
 802         ndm = nlmsg_data(nlh);
 803         ndm->ndm_family  = AF_BRIDGE;
 804         ndm->ndm_pad1    = 0;
 805         ndm->ndm_pad2    = 0;
 806         ndm->ndm_flags   = NTF_SELF;
 807         ndm->ndm_type    = 0;
 808         ndm->ndm_ifindex = dev->ifindex;
 809         ndm->ndm_state   = NUD_REACHABLE;
 810
 811         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, obj->u.fdb.addr))
 812                 goto nla_put_failure;
 813
 814         if (obj->u.fdb.vid && nla_put_u16(dump->skb, NDA_VLAN, obj->u.fdb.vid))
 815                 goto nla_put_failure;
 816
 817         nlmsg_end(dump->skb, nlh);
 818
 819 skip:
 820         dump->idx++;
 821         return 0;
 822
 823 nla_put_failure:
 824         nlmsg_cancel(dump->skb, nlh);
 825         return -EMSGSIZE;
 826 }
 827
 828 /**
 829  *      switchdev_port_fdb_dump - Dump port FDB (MAC/VLAN) entries
 830  *
 831  *      @skb: netlink skb
 832  *      @cb: netlink callback
 833  *      @dev: port device
 834  *      @filter_dev: filter device
 835  *      @idx:
 836  *
 837  *      Delete FDB entry from switch device.
 838  */
 839 int switchdev_port_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 840                             struct net_device *dev,
 841                             struct net_device *filter_dev, int idx)
 842 {
 843         struct switchdev_fdb_dump dump = {
 844                 .obj = {
 845                         .id = SWITCHDEV_OBJ_PORT_FDB,
 846                         .cb = switchdev_port_fdb_dump_cb,
 847                 },
 848                 .skb = skb,
 849                 .cb = cb,
 850                 .idx = idx,
 851         };
 852         int err;
 853
 854         err = switchdev_port_obj_dump(dev, &dump.obj);
 855         if (err)
 856                 return err;
 857
 858         return dump.idx;
 859 }
 860 EXPORT_SYMBOL_GPL(switchdev_port_fdb_dump);
 861
 862 static struct net_device *switchdev_get_lowest_dev(struct net_device *dev)
 863 {
 864         const struct switchdev_ops *ops = dev->switchdev_ops;
 865         struct net_device *lower_dev;
 866         struct net_device *port_dev;
 867         struct list_head *iter;
 868
 869         /* Recusively search down until we find a sw port dev.
 870          * (A sw port dev supports switchdev_port_attr_get).
 871          */
 872
 873         if (ops && ops->switchdev_port_attr_get)
 874                 return dev;
 875
 876         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 877                 port_dev = switchdev_get_lowest_dev(lower_dev);
 878                 if (port_dev)
 879                         return port_dev;
 880         }
 881
 882         return NULL;
 883 }
 884
 885 static struct net_device *switchdev_get_dev_by_nhs(struct fib_info *fi)
 886 {
 887         struct switchdev_attr attr = {
 888                 .id = SWITCHDEV_ATTR_PORT_PARENT_ID,
 889         };
 890         struct switchdev_attr prev_attr;
 891         struct net_device *dev = NULL;
 892         int nhsel;
 893
 894         /* For this route, all nexthop devs must be on the same switch. */
 895
 896         for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) {
 897                 const struct fib_nh *nh = &fi->fib_nh[nhsel];
 898
 899                 if (!nh->nh_dev)
 900                         return NULL;
 901
 902                 dev = switchdev_get_lowest_dev(nh->nh_dev);
 903                 if (!dev)
 904                         return NULL;
 905
 906                 if (switchdev_port_attr_get(dev, &attr))
 907                         return NULL;
 908
 909                 if (nhsel > 0) {
 910                         if (prev_attr.u.ppid.id_len != attr.u.ppid.id_len)
 911                                 return NULL;
 912                         if (memcmp(prev_attr.u.ppid.id, attr.u.ppid.id,
 913                                    attr.u.ppid.id_len))
 914                                 return NULL;
 915                 }
 916
 917                 prev_attr = attr;
 918         }
 919
 920         return dev;
 921 }
 922
 923 /**
 924  *      switchdev_fib_ipv4_add - Add/modify switch IPv4 route entry
 925  *
 926  *      @dst: route's IPv4 destination address
 927  *      @dst_len: destination address length (prefix length)
 928  *      @fi: route FIB info structure
 929  *      @tos: route TOS
 930  *      @type: route type
 931  *      @nlflags: netlink flags passed in (NLM_F_*)
 932  *      @tb_id: route table ID
 933  *
 934  *      Add/modify switch IPv4 route entry.
 935  */
 936 int switchdev_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi,
 937                            u8 tos, u8 type, u32 nlflags, u32 tb_id)
 938 {
 939         struct switchdev_obj fib_obj = {
 940                 .id = SWITCHDEV_OBJ_IPV4_FIB,
 941                 .u.ipv4_fib = {
 942                         .dst = dst,
 943                         .dst_len = dst_len,
 944                         .fi = fi,
 945                         .tos = tos,
 946                         .type = type,
 947                         .nlflags = nlflags,
 948                         .tb_id = tb_id,
 949                 },
 950         };
 951         struct net_device *dev;
 952         int err = 0;
 953
 954         /* Don't offload route if using custom ip rules or if
 955          * IPv4 FIB offloading has been disabled completely.
 956          */
 957
 958 #ifdef CONFIG_IP_MULTIPLE_TABLES
 959         if (fi->fib_net->ipv4.fib_has_custom_rules)
 960                 return 0;
 961 #endif
 962
 963         if (fi->fib_net->ipv4.fib_offload_disabled)
 964                 return 0;
 965
 966         dev = switchdev_get_dev_by_nhs(fi);
 967         if (!dev)
 968                 return 0;
 969
 970         err = switchdev_port_obj_add(dev, &fib_obj);
 971         if (!err)
 972                 fi->fib_flags |= RTNH_F_OFFLOAD;
 973
 974         return err == -EOPNOTSUPP ? 0 : err;
 975 }
 976 EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_add);
 977
 978 /**
 979  *      switchdev_fib_ipv4_del - Delete IPv4 route entry from switch
 980  *
 981  *      @dst: route's IPv4 destination address
 982  *      @dst_len: destination address length (prefix length)
 983  *      @fi: route FIB info structure
 984  *      @tos: route TOS
 985  *      @type: route type
 986  *      @tb_id: route table ID
 987  *
 988  *      Delete IPv4 route entry from switch device.
 989  */
 990 int switchdev_fib_ipv4_del(u32 dst, int dst_len, struct fib_info *fi,
 991                            u8 tos, u8 type, u32 tb_id)
 992 {
 993         struct switchdev_obj fib_obj = {
 994                 .id = SWITCHDEV_OBJ_IPV4_FIB,
 995                 .u.ipv4_fib = {
 996                         .dst = dst,
 997                         .dst_len = dst_len,
 998                         .fi = fi,
 999                         .tos = tos,
1000                         .type = type,
1001                         .nlflags = 0,
1002                         .tb_id = tb_id,
1003                 },
1004         };
1005         struct net_device *dev;
1006         int err = 0;
1007
1008         if (!(fi->fib_flags & RTNH_F_OFFLOAD))
1009                 return 0;
1010
1011         dev = switchdev_get_dev_by_nhs(fi);
1012         if (!dev)
1013                 return 0;
1014
1015         err = switchdev_port_obj_del(dev, &fib_obj);
1016         if (!err)
1017                 fi->fib_flags &= ~RTNH_F_OFFLOAD;
1018
1019         return err == -EOPNOTSUPP ? 0 : err;
1020 }
1021 EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_del);
1022
1023 /**
1024  *      switchdev_fib_ipv4_abort - Abort an IPv4 FIB operation
1025  *
1026  *      @fi: route FIB info structure
1027  */
1028 void switchdev_fib_ipv4_abort(struct fib_info *fi)
1029 {
1030         /* There was a problem installing this route to the offload
1031          * device.  For now, until we come up with more refined
1032          * policy handling, abruptly end IPv4 fib offloading for
1033          * for entire net by flushing offload device(s) of all
1034          * IPv4 routes, and mark IPv4 fib offloading broken from
1035          * this point forward.
1036          */
1037
1038         fib_flush_external(fi->fib_net);
1039         fi->fib_net->ipv4.fib_offload_disabled = true;
1040 }
1041 EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_abort);