target/linux/generic-2.6/files/drivers/net/phy/swconfig.c

   1 /*
   2  * swconfig.c: Switch configuration API
   3  *
   4  * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/types.h>
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/list.h>
  21 #include <linux/if.h>
  22 #include <linux/if_ether.h>
  23 #include <linux/capability.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/switch.h>
  26
  27 //#define DEBUG 1
  28 #ifdef DEBUG
  29 #define DPRINTF(format, ...) printk("%s: " format, __func__, ##__VA_ARGS__)
  30 #else
  31 #define DPRINTF(...) do {} while(0)
  32 #endif
  33
  34 MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
  35 MODULE_LICENSE("GPL");
  36
  37 static int swdev_id = 0;
  38 static struct list_head swdevs;
  39 static spinlock_t swdevs_lock = SPIN_LOCK_UNLOCKED;
  40 struct swconfig_callback;
  41
  42 struct swconfig_callback
  43 {
  44         struct sk_buff *msg;
  45         struct genlmsghdr *hdr;
  46         struct genl_info *info;
  47         int cmd;
  48
  49         /* callback for filling in the message data */
  50         int (*fill)(struct swconfig_callback *cb, void *arg);
  51
  52         /* callback for closing the message before sending it */
  53         int (*close)(struct swconfig_callback *cb, void *arg);
  54
  55         struct nlattr *nest[4];
  56         int args[4];
  57 };
  58
  59 /* defaults */
  60
  61 static int
  62 swconfig_get_vlan_ports(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
  63 {
  64         int ret;
  65         if (val->port_vlan >= dev->vlans)
  66                 return -EINVAL;
  67
  68         if (!dev->get_vlan_ports)
  69                 return -EOPNOTSUPP;
  70
  71         ret = dev->get_vlan_ports(dev, val);
  72         return ret;
  73 }
  74
  75 static int
  76 swconfig_set_vlan_ports(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
  77 {
  78         struct switch_port *ports = val->value.ports;
  79         int i;
  80
  81         if (val->port_vlan >= dev->vlans)
  82                 return -EINVAL;
  83
  84         /* validate ports */
  85         if (val->len > dev->ports)
  86                 return -EINVAL;
  87
  88         if (!dev->set_vlan_ports)
  89                 return -EOPNOTSUPP;
  90
  91         for (i = 0; i < val->len; i++) {
  92                 if (ports[i].id >= dev->ports)
  93                         return -EINVAL;
  94
  95                 if (dev->set_port_pvid && !(ports[i].flags & (1 << SWITCH_PORT_FLAG_TAGGED)))
  96                         dev->set_port_pvid(dev, ports[i].id, val->port_vlan);
  97         }
  98
  99         return dev->set_vlan_ports(dev, val);
 100 }
 101
 102 static int
 103 swconfig_set_pvid(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
 104 {
 105         if (val->port_vlan >= dev->ports)
 106                 return -EINVAL;
 107
 108         if (!dev->set_port_pvid)
 109                 return -EOPNOTSUPP;
 110
 111         return dev->set_port_pvid(dev, val->port_vlan, val->value.i);
 112 }
 113
 114 static int
 115 swconfig_get_pvid(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
 116 {
 117         if (val->port_vlan >= dev->ports)
 118                 return -EINVAL;
 119
 120         if (!dev->get_port_pvid)
 121                 return -EOPNOTSUPP;
 122
 123         return dev->get_port_pvid(dev, val->port_vlan, &val->value.i);
 124 }
 125
 126 static int
 127 swconfig_apply_config(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
 128 {
 129         /* don't complain if not supported by the switch driver */
 130         if (!dev->apply_config)
 131                 return 0;
 132
 133         return dev->apply_config(dev);
 134 }
 135
 136 static int
 137 swconfig_reset_switch(struct switch_dev *dev, const struct switch_attr *attr, struct switch_val *val)
 138 {
 139         /* don't complain if not supported by the switch driver */
 140         if (!dev->reset_switch)
 141                 return 0;
 142
 143         return dev->reset_switch(dev);
 144 }
 145
 146 enum global_defaults {
 147         GLOBAL_APPLY,
 148         GLOBAL_RESET,
 149 };
 150
 151 enum vlan_defaults {
 152         VLAN_PORTS,
 153 };
 154
 155 enum port_defaults {
 156         PORT_PVID,
 157 };
 158
 159 static struct switch_attr default_global[] = {
 160         [GLOBAL_APPLY] = {
 161                 .type = SWITCH_TYPE_NOVAL,
 162                 .name = "apply",
 163                 .description = "Activate changes in the hardware",
 164                 .set = swconfig_apply_config,
 165         },
 166         [GLOBAL_RESET] = {
 167                 .type = SWITCH_TYPE_NOVAL,
 168                 .name = "reset",
 169                 .description = "Reset the switch",
 170                 .set = swconfig_reset_switch,
 171         }
 172 };
 173
 174 static struct switch_attr default_port[] = {
 175         [PORT_PVID] = {
 176                 .type = SWITCH_TYPE_INT,
 177                 .name = "pvid",
 178                 .description = "Primary VLAN ID",
 179                 .set = swconfig_set_pvid,
 180                 .get = swconfig_get_pvid,
 181         }
 182 };
 183
 184 static struct switch_attr default_vlan[] = {
 185         [VLAN_PORTS] = {
 186                 .type = SWITCH_TYPE_PORTS,
 187                 .name = "ports",
 188                 .description = "VLAN port mapping",
 189                 .set = swconfig_set_vlan_ports,
 190                 .get = swconfig_get_vlan_ports,
 191         },
 192 };
 193
 194
 195 static void swconfig_defaults_init(struct switch_dev *dev)
 196 {
 197         dev->def_global = 0;
 198         dev->def_vlan = 0;
 199         dev->def_port = 0;
 200
 201         if (dev->get_vlan_ports || dev->set_vlan_ports)
 202                 set_bit(VLAN_PORTS, &dev->def_vlan);
 203
 204         if (dev->get_port_pvid || dev->set_port_pvid)
 205                 set_bit(PORT_PVID, &dev->def_port);
 206
 207         /* always present, can be no-op */
 208         set_bit(GLOBAL_APPLY, &dev->def_global);
 209         set_bit(GLOBAL_RESET, &dev->def_global);
 210 }
 211
 212
 213 static struct genl_family switch_fam = {
 214         .id = GENL_ID_GENERATE,
 215         .name = "switch",
 216         .hdrsize = 0,
 217         .version = 1,
 218         .maxattr = SWITCH_ATTR_MAX,
 219 };
 220
 221 static const struct nla_policy switch_policy[SWITCH_ATTR_MAX+1] = {
 222         [SWITCH_ATTR_ID] = { .type = NLA_U32 },
 223         [SWITCH_ATTR_OP_ID] = { .type = NLA_U32 },
 224         [SWITCH_ATTR_OP_PORT] = { .type = NLA_U32 },
 225         [SWITCH_ATTR_OP_VLAN] = { .type = NLA_U32 },
 226         [SWITCH_ATTR_OP_VALUE_INT] = { .type = NLA_U32 },
 227         [SWITCH_ATTR_OP_VALUE_STR] = { .type = NLA_NUL_STRING },
 228         [SWITCH_ATTR_OP_VALUE_PORTS] = { .type = NLA_NESTED },
 229         [SWITCH_ATTR_TYPE] = { .type = NLA_U32 },
 230 };
 231
 232 static const struct nla_policy port_policy[SWITCH_PORT_ATTR_MAX+1] = {
 233         [SWITCH_PORT_ID] = { .type = NLA_U32 },
 234         [SWITCH_PORT_FLAG_TAGGED] = { .type = NLA_FLAG },
 235 };
 236
 237 static inline void
 238 swconfig_lock(void)
 239 {
 240         spin_lock(&swdevs_lock);
 241 }
 242
 243 static inline void
 244 swconfig_unlock(void)
 245 {
 246         spin_unlock(&swdevs_lock);
 247 }
 248
 249 static struct switch_dev *
 250 swconfig_get_dev(struct genl_info *info)
 251 {
 252         struct switch_dev *dev = NULL;
 253         struct switch_dev *p;
 254         int id;
 255
 256         if (!info->attrs[SWITCH_ATTR_ID])
 257                 goto done;
 258
 259         id = nla_get_u32(info->attrs[SWITCH_ATTR_ID]);
 260         swconfig_lock();
 261         list_for_each_entry(p, &swdevs, dev_list) {
 262                 if (id != p->id)
 263                         continue;
 264
 265                 dev = p;
 266                 break;
 267         }
 268         if (dev)
 269                 spin_lock(&dev->lock);
 270         else
 271                 DPRINTF("device %d not found\n", id);
 272         swconfig_unlock();
 273 done:
 274         return dev;
 275 }
 276
 277 static inline void
 278 swconfig_put_dev(struct switch_dev *dev)
 279 {
 280         spin_unlock(&dev->lock);
 281 }
 282
 283 static int
 284 swconfig_dump_attr(struct swconfig_callback *cb, void *arg)
 285 {
 286         struct switch_attr *op = arg;
 287         struct genl_info *info = cb->info;
 288         struct sk_buff *msg = cb->msg;
 289         int id = cb->args[0];
 290         void *hdr;
 291
 292         hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq, &switch_fam,
 293                         NLM_F_MULTI, SWITCH_CMD_NEW_ATTR);
 294         if (IS_ERR(hdr))
 295                 return -1;
 296
 297         NLA_PUT_U32(msg, SWITCH_ATTR_OP_ID, id);
 298         NLA_PUT_U32(msg, SWITCH_ATTR_OP_TYPE, op->type);
 299         NLA_PUT_STRING(msg, SWITCH_ATTR_OP_NAME, op->name);
 300         if (op->description)
 301                 NLA_PUT_STRING(msg, SWITCH_ATTR_OP_DESCRIPTION,
 302                         op->description);
 303
 304         return genlmsg_end(msg, hdr);
 305 nla_put_failure:
 306         genlmsg_cancel(msg, hdr);
 307         return -EMSGSIZE;
 308 }
 309
 310 /* spread multipart messages across multiple message buffers */
 311 static int
 312 swconfig_send_multipart(struct swconfig_callback *cb, void *arg)
 313 {
 314         struct genl_info *info = cb->info;
 315         int restart = 0;
 316         int err;
 317
 318         do {
 319                 if (!cb->msg) {
 320                         cb->msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 321                         if (cb->msg == NULL)
 322                                 goto error;
 323                 }
 324
 325                 if (!(cb->fill(cb, arg) < 0))
 326                         break;
 327
 328                 /* fill failed, check if this was already the second attempt */
 329                 if (restart)
 330                         goto error;
 331
 332                 /* try again in a new message, send the current one */
 333                 restart = 1;
 334                 if (cb->close) {
 335                         if (cb->close(cb, arg) < 0)
 336                                 goto error;
 337                 }
 338                 err = genlmsg_unicast(cb->msg, info->snd_pid);
 339                 cb->msg = NULL;
 340                 if (err < 0)
 341                         goto error;
 342
 343         } while (restart);
 344
 345         return 0;
 346
 347 error:
 348         if (cb->msg)
 349                 nlmsg_free(cb->msg);
 350         return -1;
 351 }
 352
 353 static int
 354 swconfig_list_attrs(struct sk_buff *skb, struct genl_info *info)
 355 {
 356         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 357         const struct switch_attrlist *alist;
 358         struct switch_dev *dev;
 359         struct swconfig_callback cb;
 360         int err = -EINVAL;
 361         int i;
 362
 363         /* defaults */
 364         struct switch_attr *def_list;
 365         unsigned long *def_active;
 366         int n_def;
 367
 368         dev = swconfig_get_dev(info);
 369         if (!dev)
 370                 return -EINVAL;
 371
 372         switch(hdr->cmd) {
 373         case SWITCH_CMD_LIST_GLOBAL:
 374                 alist = &dev->attr_global;
 375                 def_list = default_global;
 376                 def_active = &dev->def_global;
 377                 n_def = ARRAY_SIZE(default_global);
 378                 break;
 379         case SWITCH_CMD_LIST_VLAN:
 380                 alist = &dev->attr_vlan;
 381                 def_list = default_vlan;
 382                 def_active = &dev->def_vlan;
 383                 n_def = ARRAY_SIZE(default_vlan);
 384                 break;
 385         case SWITCH_CMD_LIST_PORT:
 386                 alist = &dev->attr_port;
 387                 def_list = default_port;
 388                 def_active = &dev->def_port;
 389                 n_def = ARRAY_SIZE(default_port);
 390                 break;
 391         default:
 392                 WARN_ON(1);
 393                 goto out;
 394         }
 395
 396         memset(&cb, 0, sizeof(cb));
 397         cb.info = info;
 398         cb.fill = swconfig_dump_attr;
 399         for (i = 0; i < alist->n_attr; i++) {
 400                 if (alist->attr[i].disabled)
 401                         continue;
 402                 cb.args[0] = i;
 403                 err = swconfig_send_multipart(&cb, (void *) &alist->attr[i]);
 404                 if (err < 0)
 405                         goto error;
 406         }
 407
 408         /* defaults */
 409         for (i = 0; i < n_def; i++) {
 410                 if (!test_bit(i, def_active))
 411                         continue;
 412                 cb.args[0] = SWITCH_ATTR_DEFAULTS_OFFSET + i;
 413                 err = swconfig_send_multipart(&cb, (void *) &def_list[i]);
 414                 if (err < 0)
 415                         goto error;
 416         }
 417         swconfig_put_dev(dev);
 418
 419         if (!cb.msg)
 420                 return 0;
 421
 422         return genlmsg_unicast(cb.msg, info->snd_pid);
 423
 424 error:
 425         if (cb.msg)
 426                 nlmsg_free(cb.msg);
 427 out:
 428         swconfig_put_dev(dev);
 429         return err;
 430 }
 431
 432 static const struct switch_attr *
 433 swconfig_lookup_attr(struct switch_dev *dev, struct genl_info *info,
 434                 struct switch_val *val)
 435 {
 436         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 437         const struct switch_attrlist *alist;
 438         const struct switch_attr *attr = NULL;
 439         int attr_id;
 440
 441         /* defaults */
 442         struct switch_attr *def_list;
 443         unsigned long *def_active;
 444         int n_def;
 445
 446         if (!info->attrs[SWITCH_ATTR_OP_ID])
 447                 goto done;
 448
 449         switch(hdr->cmd) {
 450         case SWITCH_CMD_SET_GLOBAL:
 451         case SWITCH_CMD_GET_GLOBAL:
 452                 alist = &dev->attr_global;
 453                 def_list = default_global;
 454                 def_active = &dev->def_global;
 455                 n_def = ARRAY_SIZE(default_global);
 456                 break;
 457         case SWITCH_CMD_SET_VLAN:
 458         case SWITCH_CMD_GET_VLAN:
 459                 alist = &dev->attr_vlan;
 460                 def_list = default_vlan;
 461                 def_active = &dev->def_vlan;
 462                 n_def = ARRAY_SIZE(default_vlan);
 463                 if (!info->attrs[SWITCH_ATTR_OP_VLAN])
 464                         goto done;
 465                 val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_VLAN]);
 466                 if (val->port_vlan >= dev->vlans)
 467                         goto done;
 468                 break;
 469         case SWITCH_CMD_SET_PORT:
 470         case SWITCH_CMD_GET_PORT:
 471                 alist = &dev->attr_port;
 472                 def_list = default_port;
 473                 def_active = &dev->def_port;
 474                 n_def = ARRAY_SIZE(default_port);
 475                 if (!info->attrs[SWITCH_ATTR_OP_PORT])
 476                         goto done;
 477                 val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_PORT]);
 478                 if (val->port_vlan >= dev->ports)
 479                         goto done;
 480                 break;
 481         default:
 482                 WARN_ON(1);
 483                 goto done;
 484         }
 485
 486         if (!alist)
 487                 goto done;
 488
 489         attr_id = nla_get_u32(info->attrs[SWITCH_ATTR_OP_ID]);
 490         if (attr_id >= SWITCH_ATTR_DEFAULTS_OFFSET) {
 491                 attr_id -= SWITCH_ATTR_DEFAULTS_OFFSET;
 492                 if (attr_id >= n_def)
 493                         goto done;
 494                 if (!test_bit(attr_id, def_active))
 495                         goto done;
 496                 attr = &def_list[attr_id];
 497         } else {
 498                 if (attr_id >= alist->n_attr)
 499                         goto done;
 500                 attr = &alist->attr[attr_id];
 501         }
 502
 503         if (attr->disabled)
 504                 attr = NULL;
 505
 506 done:
 507         if (!attr)
 508                 DPRINTF("attribute lookup failed\n");
 509         val->attr = attr;
 510         return attr;
 511 }
 512
 513 static int
 514 swconfig_parse_ports(struct sk_buff *msg, struct nlattr *head,
 515                 struct switch_val *val, int max)
 516 {
 517         struct nlattr *nla;
 518         int rem;
 519
 520         val->len = 0;
 521         nla_for_each_nested(nla, head, rem) {
 522                 struct nlattr *tb[SWITCH_PORT_ATTR_MAX+1];
 523                 struct switch_port *port = &val->value.ports[val->len];
 524
 525                 if (val->len >= max)
 526                         return -EINVAL;
 527
 528                 if (nla_parse_nested(tb, SWITCH_PORT_ATTR_MAX, nla,
 529                                 port_policy))
 530                         return -EINVAL;
 531
 532                 if (!tb[SWITCH_PORT_ID])
 533                         return -EINVAL;
 534
 535                 port->id = nla_get_u32(tb[SWITCH_PORT_ID]);
 536                 if (tb[SWITCH_PORT_FLAG_TAGGED])
 537                         port->flags |= (1 << SWITCH_PORT_FLAG_TAGGED);
 538                 val->len++;
 539         }
 540
 541         return 0;
 542 }
 543
 544 static int
 545 swconfig_set_attr(struct sk_buff *skb, struct genl_info *info)
 546 {
 547         const struct switch_attr *attr;
 548         struct switch_dev *dev;
 549         struct switch_val val;
 550         int err = -EINVAL;
 551
 552         dev = swconfig_get_dev(info);
 553         if (!dev)
 554                 return -EINVAL;
 555
 556         memset(&val, 0, sizeof(val));
 557         attr = swconfig_lookup_attr(dev, info, &val);
 558         if (!attr || !attr->set)
 559                 goto error;
 560
 561         val.attr = attr;
 562         switch(attr->type) {
 563         case SWITCH_TYPE_NOVAL:
 564                 break;
 565         case SWITCH_TYPE_INT:
 566                 if (!info->attrs[SWITCH_ATTR_OP_VALUE_INT])
 567                         goto error;
 568                 val.value.i =
 569                         nla_get_u32(info->attrs[SWITCH_ATTR_OP_VALUE_INT]);
 570                 break;
 571         case SWITCH_TYPE_STRING:
 572                 if (!info->attrs[SWITCH_ATTR_OP_VALUE_STR])
 573                         goto error;
 574                 val.value.s =
 575                         nla_data(info->attrs[SWITCH_ATTR_OP_VALUE_STR]);
 576                 break;
 577         case SWITCH_TYPE_PORTS:
 578                 val.value.ports = dev->portbuf;
 579                 memset(dev->portbuf, 0,
 580                         sizeof(struct switch_port) * dev->ports);
 581
 582                 /* TODO: implement multipart? */
 583                 if (info->attrs[SWITCH_ATTR_OP_VALUE_PORTS]) {
 584                         err = swconfig_parse_ports(skb,
 585                                 info->attrs[SWITCH_ATTR_OP_VALUE_PORTS], &val, dev->ports);
 586                         if (err < 0)
 587                                 goto error;
 588                 } else {
 589                         val.len = 0;
 590                         err = 0;
 591                 }
 592                 break;
 593         default:
 594                 goto error;
 595         }
 596
 597         err = attr->set(dev, attr, &val);
 598 error:
 599         swconfig_put_dev(dev);
 600         return err;
 601 }
 602
 603 static int
 604 swconfig_close_portlist(struct swconfig_callback *cb, void *arg)
 605 {
 606         if (cb->nest[0])
 607                 nla_nest_end(cb->msg, cb->nest[0]);
 608         return 0;
 609 }
 610
 611 static int
 612 swconfig_send_port(struct swconfig_callback *cb, void *arg)
 613 {
 614         const struct switch_port *port = arg;
 615         struct nlattr *p = NULL;
 616
 617         if (!cb->nest[0]) {
 618                 cb->nest[0] = nla_nest_start(cb->msg, cb->cmd);
 619                 if (!cb->nest[0])
 620                         return -1;
 621         }
 622
 623         p = nla_nest_start(cb->msg, SWITCH_ATTR_PORT);
 624         if (!p)
 625                 goto error;
 626
 627         NLA_PUT_U32(cb->msg, SWITCH_PORT_ID, port->id);
 628         if (port->flags & (1 << SWITCH_PORT_FLAG_TAGGED))
 629                 NLA_PUT_FLAG(cb->msg, SWITCH_PORT_FLAG_TAGGED);
 630
 631         nla_nest_end(cb->msg, p);
 632         return 0;
 633
 634 nla_put_failure:
 635                 nla_nest_cancel(cb->msg, p);
 636 error:
 637         nla_nest_cancel(cb->msg, cb->nest[0]);
 638         return -1;
 639 }
 640
 641 static int
 642 swconfig_send_ports(struct sk_buff **msg, struct genl_info *info, int attr,
 643                 const struct switch_val *val)
 644 {
 645         struct swconfig_callback cb;
 646         int err = 0;
 647         int i;
 648
 649         if (!val->value.ports)
 650                 return -EINVAL;
 651
 652         memset(&cb, 0, sizeof(cb));
 653         cb.cmd = attr;
 654         cb.msg = *msg;
 655         cb.info = info;
 656         cb.fill = swconfig_send_port;
 657         cb.close = swconfig_close_portlist;
 658
 659         cb.nest[0] = nla_nest_start(cb.msg, cb.cmd);
 660         for (i = 0; i < val->len; i++) {
 661                 err = swconfig_send_multipart(&cb, &val->value.ports[i]);
 662                 if (err)
 663                         goto done;
 664         }
 665         err = val->len;
 666         swconfig_close_portlist(&cb, NULL);
 667         *msg = cb.msg;
 668
 669 done:
 670         return err;
 671 }
 672
 673 static int
 674 swconfig_get_attr(struct sk_buff *skb, struct genl_info *info)
 675 {
 676         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 677         const struct switch_attr *attr;
 678         struct switch_dev *dev;
 679         struct sk_buff *msg = NULL;
 680         struct switch_val val;
 681         int err = -EINVAL;
 682         int cmd = hdr->cmd;
 683
 684         dev = swconfig_get_dev(info);
 685         if (!dev)
 686                 return -EINVAL;
 687
 688         memset(&val, 0, sizeof(val));
 689         attr = swconfig_lookup_attr(dev, info, &val);
 690         if (!attr || !attr->get)
 691                 goto error_dev;
 692
 693         if (attr->type == SWITCH_TYPE_PORTS) {
 694                 val.value.ports = dev->portbuf;
 695                 memset(dev->portbuf, 0,
 696                         sizeof(struct switch_port) * dev->ports);
 697         }
 698
 699         err = attr->get(dev, attr, &val);
 700         if (err)
 701                 goto error;
 702
 703         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 704         if (!msg)
 705                 goto error;
 706
 707         hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq, &switch_fam,
 708                         0, cmd);
 709         if (IS_ERR(hdr))
 710                 goto nla_put_failure;
 711
 712         switch(attr->type) {
 713         case SWITCH_TYPE_INT:
 714                 NLA_PUT_U32(msg, SWITCH_ATTR_OP_VALUE_INT, val.value.i);
 715                 break;
 716         case SWITCH_TYPE_STRING:
 717                 NLA_PUT_STRING(msg, SWITCH_ATTR_OP_VALUE_STR, val.value.s);
 718                 break;
 719         case SWITCH_TYPE_PORTS:
 720                 err = swconfig_send_ports(&msg, info,
 721                                 SWITCH_ATTR_OP_VALUE_PORTS, &val);
 722                 if (err < 0)
 723                         goto nla_put_failure;
 724                 break;
 725         default:
 726                 DPRINTF("invalid type in attribute\n");
 727                 err = -EINVAL;
 728                 goto error;
 729         }
 730         err = genlmsg_end(msg, hdr);
 731         if (err < 0)
 732                 goto nla_put_failure;
 733
 734         swconfig_put_dev(dev);
 735         return genlmsg_unicast(msg, info->snd_pid);
 736
 737 nla_put_failure:
 738         if (msg)
 739                 nlmsg_free(msg);
 740 error_dev:
 741         swconfig_put_dev(dev);
 742 error:
 743         if (!err)
 744                 err = -ENOMEM;
 745         return err;
 746 }
 747
 748 static int
 749 swconfig_send_switch(struct sk_buff *msg, u32 pid, u32 seq, int flags,
 750                 const struct switch_dev *dev)
 751 {
 752         void *hdr;
 753
 754         hdr = genlmsg_put(msg, pid, seq, &switch_fam, flags,
 755                         SWITCH_CMD_NEW_ATTR);
 756         if (IS_ERR(hdr))
 757                 return -1;
 758
 759         NLA_PUT_U32(msg, SWITCH_ATTR_ID, dev->id);
 760         NLA_PUT_STRING(msg, SWITCH_ATTR_NAME, dev->name);
 761         NLA_PUT_STRING(msg, SWITCH_ATTR_DEV_NAME, dev->devname);
 762         NLA_PUT_U32(msg, SWITCH_ATTR_VLANS, dev->vlans);
 763         NLA_PUT_U32(msg, SWITCH_ATTR_PORTS, dev->ports);
 764         NLA_PUT_U32(msg, SWITCH_ATTR_CPU_PORT, dev->cpu_port);
 765
 766         return genlmsg_end(msg, hdr);
 767 nla_put_failure:
 768         genlmsg_cancel(msg, hdr);
 769         return -EMSGSIZE;
 770 }
 771
 772 static int swconfig_dump_switches(struct sk_buff *skb,
 773                 struct netlink_callback *cb)
 774 {
 775         struct switch_dev *dev;
 776         int start = cb->args[0];
 777         int idx = 0;
 778
 779         swconfig_lock();
 780         list_for_each_entry(dev, &swdevs, dev_list) {
 781                 if (++idx <= start)
 782                         continue;
 783                 if (swconfig_send_switch(skb, NETLINK_CB(cb->skb).pid,
 784                                 cb->nlh->nlmsg_seq, NLM_F_MULTI,
 785                                 dev) < 0)
 786                         break;
 787         }
 788         swconfig_unlock();
 789         cb->args[0] = idx;
 790
 791         return skb->len;
 792 }
 793
 794 static int
 795 swconfig_done(struct netlink_callback *cb)
 796 {
 797         return 0;
 798 }
 799
 800 static struct genl_ops swconfig_ops[] = {
 801         {
 802                 .cmd = SWITCH_CMD_LIST_GLOBAL,
 803                 .doit = swconfig_list_attrs,
 804                 .policy = switch_policy,
 805         },
 806         {
 807                 .cmd = SWITCH_CMD_LIST_VLAN,
 808                 .doit = swconfig_list_attrs,
 809                 .policy = switch_policy,
 810         },
 811         {
 812                 .cmd = SWITCH_CMD_LIST_PORT,
 813                 .doit = swconfig_list_attrs,
 814                 .policy = switch_policy,
 815         },
 816         {
 817                 .cmd = SWITCH_CMD_GET_GLOBAL,
 818                 .doit = swconfig_get_attr,
 819                 .policy = switch_policy,
 820         },
 821         {
 822                 .cmd = SWITCH_CMD_GET_VLAN,
 823                 .doit = swconfig_get_attr,
 824                 .policy = switch_policy,
 825         },
 826         {
 827                 .cmd = SWITCH_CMD_GET_PORT,
 828                 .doit = swconfig_get_attr,
 829                 .policy = switch_policy,
 830         },
 831         {
 832                 .cmd = SWITCH_CMD_SET_GLOBAL,
 833                 .doit = swconfig_set_attr,
 834                 .policy = switch_policy,
 835         },
 836         {
 837                 .cmd = SWITCH_CMD_SET_VLAN,
 838                 .doit = swconfig_set_attr,
 839                 .policy = switch_policy,
 840         },
 841         {
 842                 .cmd = SWITCH_CMD_SET_PORT,
 843                 .doit = swconfig_set_attr,
 844                 .policy = switch_policy,
 845         },
 846         {
 847                 .cmd = SWITCH_CMD_GET_SWITCH,
 848                 .dumpit = swconfig_dump_switches,
 849                 .policy = switch_policy,
 850                 .done = swconfig_done,
 851         }
 852 };
 853
 854 int
 855 register_switch(struct switch_dev *dev, struct net_device *netdev)
 856 {
 857         INIT_LIST_HEAD(&dev->dev_list);
 858         if (netdev) {
 859                 dev->netdev = netdev;
 860                 if (!dev->devname)
 861                         dev->devname = netdev->name;
 862         }
 863         BUG_ON(!dev->devname);
 864
 865         if (dev->ports > 0) {
 866                 dev->portbuf = kzalloc(sizeof(struct switch_port) * dev->ports,
 867                                 GFP_KERNEL);
 868                 if (!dev->portbuf)
 869                         return -ENOMEM;
 870         }
 871         dev->id = ++swdev_id;
 872         swconfig_defaults_init(dev);
 873         spin_lock_init(&dev->lock);
 874         swconfig_lock();
 875         list_add(&dev->dev_list, &swdevs);
 876         swconfig_unlock();
 877
 878         return 0;
 879 }
 880 EXPORT_SYMBOL_GPL(register_switch);
 881
 882 void
 883 unregister_switch(struct switch_dev *dev)
 884 {
 885         kfree(dev->portbuf);
 886         spin_lock(&dev->lock);
 887         swconfig_lock();
 888         list_del(&dev->dev_list);
 889         swconfig_unlock();
 890 }
 891 EXPORT_SYMBOL_GPL(unregister_switch);
 892
 893
 894 static int __init
 895 swconfig_init(void)
 896 {
 897         int i, err;
 898
 899         INIT_LIST_HEAD(&swdevs);
 900         err = genl_register_family(&switch_fam);
 901         if (err)
 902                 return err;
 903
 904         for (i = 0; i < ARRAY_SIZE(swconfig_ops); i++) {
 905                 err = genl_register_ops(&switch_fam, &swconfig_ops[i]);
 906                 if (err)
 907                         goto unregister;
 908         }
 909
 910         return 0;
 911
 912 unregister:
 913         genl_unregister_family(&switch_fam);
 914         return err;
 915 }
 916
 917 static void __exit
 918 swconfig_exit(void)
 919 {
 920         genl_unregister_family(&switch_fam);
 921 }
 922
 923 module_init(swconfig_init);
 924 module_exit(swconfig_exit);
 925