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 & 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                 break;
 467         case SWITCH_CMD_SET_PORT:
 468         case SWITCH_CMD_GET_PORT:
 469                 alist = &dev->attr_port;
 470                 def_list = default_port;
 471                 def_active = &dev->def_port;
 472                 n_def = ARRAY_SIZE(default_port);
 473                 if (!info->attrs[SWITCH_ATTR_OP_PORT])
 474                         goto done;
 475                 val->port_vlan = nla_get_u32(info->attrs[SWITCH_ATTR_OP_PORT]);
 476                 break;
 477         default:
 478                 WARN_ON(1);
 479                 goto done;
 480         }
 481
 482         if (!alist)
 483                 goto done;
 484
 485         attr_id = nla_get_u32(info->attrs[SWITCH_ATTR_OP_ID]);
 486         if (attr_id >= SWITCH_ATTR_DEFAULTS_OFFSET) {
 487                 attr_id -= SWITCH_ATTR_DEFAULTS_OFFSET;
 488                 if (attr_id >= n_def)
 489                         goto done;
 490                 if (!test_bit(attr_id, def_active))
 491                         goto done;
 492                 attr = &def_list[attr_id];
 493         } else {
 494                 if (attr_id >= alist->n_attr)
 495                         goto done;
 496                 attr = &alist->attr[attr_id];
 497         }
 498
 499         if (attr->disabled)
 500                 attr = NULL;
 501
 502 done:
 503         if (!attr)
 504                 DPRINTF("attribute lookup failed\n");
 505         val->attr = attr;
 506         return attr;
 507 }
 508
 509 static int
 510 swconfig_parse_ports(struct sk_buff *msg, struct nlattr *head,
 511                 struct switch_val *val, int max)
 512 {
 513         struct nlattr *nla;
 514         int rem;
 515
 516         val->len = 0;
 517         nla_for_each_nested(nla, head, rem) {
 518                 struct nlattr *tb[SWITCH_PORT_ATTR_MAX+1];
 519                 struct switch_port *port = &val->value.ports[val->len];
 520
 521                 if (val->len >= max)
 522                         return -EINVAL;
 523
 524                 if (nla_parse_nested(tb, SWITCH_PORT_ATTR_MAX, nla,
 525                                 port_policy))
 526                         return -EINVAL;
 527
 528                 if (!tb[SWITCH_PORT_ID])
 529                         return -EINVAL;
 530
 531                 port->id = nla_get_u32(tb[SWITCH_PORT_ID]);
 532                 if (tb[SWITCH_PORT_FLAG_TAGGED])
 533                         port->flags |= (1 << SWITCH_PORT_FLAG_TAGGED);
 534                 val->len++;
 535         }
 536
 537         return 0;
 538 }
 539
 540 static int
 541 swconfig_set_attr(struct sk_buff *skb, struct genl_info *info)
 542 {
 543         const struct switch_attr *attr;
 544         struct switch_dev *dev;
 545         struct switch_val val;
 546         int err = -EINVAL;
 547
 548         dev = swconfig_get_dev(info);
 549         if (!dev)
 550                 return -EINVAL;
 551
 552         memset(&val, 0, sizeof(val));
 553         attr = swconfig_lookup_attr(dev, info, &val);
 554         if (!attr || !attr->set)
 555                 goto error;
 556
 557         val.attr = attr;
 558         switch(attr->type) {
 559         case SWITCH_TYPE_NOVAL:
 560                 break;
 561         case SWITCH_TYPE_INT:
 562                 if (!info->attrs[SWITCH_ATTR_OP_VALUE_INT])
 563                         goto error;
 564                 val.value.i =
 565                         nla_get_u32(info->attrs[SWITCH_ATTR_OP_VALUE_INT]);
 566                 break;
 567         case SWITCH_TYPE_STRING:
 568                 if (!info->attrs[SWITCH_ATTR_OP_VALUE_STR])
 569                         goto error;
 570                 val.value.s =
 571                         nla_data(info->attrs[SWITCH_ATTR_OP_VALUE_STR]);
 572                 break;
 573         case SWITCH_TYPE_PORTS:
 574                 val.value.ports = dev->portbuf;
 575                 memset(dev->portbuf, 0,
 576                         sizeof(struct switch_port) * dev->ports);
 577
 578                 /* TODO: implement multipart? */
 579                 if (info->attrs[SWITCH_ATTR_OP_VALUE_PORTS]) {
 580                         err = swconfig_parse_ports(skb,
 581                                 info->attrs[SWITCH_ATTR_OP_VALUE_PORTS], &val, dev->ports);
 582                         if (err < 0)
 583                                 goto error;
 584                 } else {
 585                         val.len = 0;
 586                         err = 0;
 587                 }
 588                 break;
 589         default:
 590                 goto error;
 591         }
 592
 593         err = attr->set(dev, attr, &val);
 594 error:
 595         swconfig_put_dev(dev);
 596         return err;
 597 }
 598
 599 static int
 600 swconfig_close_portlist(struct swconfig_callback *cb, void *arg)
 601 {
 602         if (cb->nest[0])
 603                 nla_nest_end(cb->msg, cb->nest[0]);
 604         return 0;
 605 }
 606
 607 static int
 608 swconfig_send_port(struct swconfig_callback *cb, void *arg)
 609 {
 610         const struct switch_port *port = arg;
 611         struct nlattr *p = NULL;
 612
 613         if (!cb->nest[0]) {
 614                 cb->nest[0] = nla_nest_start(cb->msg, cb->cmd);
 615                 if (!cb->nest[0])
 616                         return -1;
 617         }
 618
 619         p = nla_nest_start(cb->msg, SWITCH_ATTR_PORT);
 620         if (!p)
 621                 goto error;
 622
 623         NLA_PUT_U32(cb->msg, SWITCH_PORT_ID, port->id);
 624         if (port->flags & (1 << SWITCH_PORT_FLAG_TAGGED))
 625                 NLA_PUT_FLAG(cb->msg, SWITCH_PORT_FLAG_TAGGED);
 626
 627         nla_nest_end(cb->msg, p);
 628         return 0;
 629
 630 nla_put_failure:
 631                 nla_nest_cancel(cb->msg, p);
 632 error:
 633         nla_nest_cancel(cb->msg, cb->nest[0]);
 634         return -1;
 635 }
 636
 637 static int
 638 swconfig_send_ports(struct sk_buff **msg, struct genl_info *info, int attr,
 639                 const struct switch_val *val)
 640 {
 641         struct swconfig_callback cb;
 642         int err = 0;
 643         int i;
 644
 645         if (!val->value.ports)
 646                 return -EINVAL;
 647
 648         memset(&cb, 0, sizeof(cb));
 649         cb.cmd = attr;
 650         cb.msg = *msg;
 651         cb.info = info;
 652         cb.fill = swconfig_send_port;
 653         cb.close = swconfig_close_portlist;
 654
 655         cb.nest[0] = nla_nest_start(cb.msg, cb.cmd);
 656         for (i = 0; i < val->len; i++) {
 657                 err = swconfig_send_multipart(&cb, &val->value.ports[i]);
 658                 if (err)
 659                         goto done;
 660         }
 661         err = val->len;
 662         swconfig_close_portlist(&cb, NULL);
 663         *msg = cb.msg;
 664
 665 done:
 666         return err;
 667 }
 668
 669 static int
 670 swconfig_get_attr(struct sk_buff *skb, struct genl_info *info)
 671 {
 672         struct genlmsghdr *hdr = nlmsg_data(info->nlhdr);
 673         const struct switch_attr *attr;
 674         struct switch_dev *dev;
 675         struct sk_buff *msg = NULL;
 676         struct switch_val val;
 677         int err = -EINVAL;
 678         int cmd = hdr->cmd;
 679
 680         dev = swconfig_get_dev(info);
 681         if (!dev)
 682                 return -EINVAL;
 683
 684         memset(&val, 0, sizeof(val));
 685         attr = swconfig_lookup_attr(dev, info, &val);
 686         if (!attr || !attr->get)
 687                 goto error_dev;
 688
 689         if (attr->type == SWITCH_TYPE_PORTS) {
 690                 val.value.ports = dev->portbuf;
 691                 memset(dev->portbuf, 0,
 692                         sizeof(struct switch_port) * dev->ports);
 693         }
 694
 695         err = attr->get(dev, attr, &val);
 696         if (err)
 697                 goto error;
 698
 699         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 700         if (!msg)
 701                 goto error;
 702
 703         hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq, &switch_fam,
 704                         0, cmd);
 705         if (IS_ERR(hdr))
 706                 goto nla_put_failure;
 707
 708         switch(attr->type) {
 709         case SWITCH_TYPE_INT:
 710                 NLA_PUT_U32(msg, SWITCH_ATTR_OP_VALUE_INT, val.value.i);
 711                 break;
 712         case SWITCH_TYPE_STRING:
 713                 NLA_PUT_STRING(msg, SWITCH_ATTR_OP_VALUE_STR, val.value.s);
 714                 break;
 715         case SWITCH_TYPE_PORTS:
 716                 err = swconfig_send_ports(&msg, info,
 717                                 SWITCH_ATTR_OP_VALUE_PORTS, &val);
 718                 if (err < 0)
 719                         goto nla_put_failure;
 720                 break;
 721         default:
 722                 DPRINTF("invalid type in attribute\n");
 723                 err = -EINVAL;
 724                 goto error;
 725         }
 726         err = genlmsg_end(msg, hdr);
 727         if (err < 0)
 728                 goto nla_put_failure;
 729
 730         swconfig_put_dev(dev);
 731         return genlmsg_unicast(msg, info->snd_pid);
 732
 733 nla_put_failure:
 734         if (msg)
 735                 nlmsg_free(msg);
 736 error_dev:
 737         swconfig_put_dev(dev);
 738 error:
 739         if (!err)
 740                 err = -ENOMEM;
 741         return err;
 742 }
 743
 744 static int
 745 swconfig_send_switch(struct sk_buff *msg, u32 pid, u32 seq, int flags,
 746                 const struct switch_dev *dev)
 747 {
 748         void *hdr;
 749
 750         hdr = genlmsg_put(msg, pid, seq, &switch_fam, flags,
 751                         SWITCH_CMD_NEW_ATTR);
 752         if (IS_ERR(hdr))
 753                 return -1;
 754
 755         NLA_PUT_U32(msg, SWITCH_ATTR_ID, dev->id);
 756         NLA_PUT_STRING(msg, SWITCH_ATTR_NAME, dev->name);
 757         NLA_PUT_STRING(msg, SWITCH_ATTR_DEV_NAME, dev->devname);
 758         NLA_PUT_U32(msg, SWITCH_ATTR_VLANS, dev->vlans);
 759         NLA_PUT_U32(msg, SWITCH_ATTR_PORTS, dev->ports);
 760
 761         return genlmsg_end(msg, hdr);
 762 nla_put_failure:
 763         genlmsg_cancel(msg, hdr);
 764         return -EMSGSIZE;
 765 }
 766
 767 static int swconfig_dump_switches(struct sk_buff *skb,
 768                 struct netlink_callback *cb)
 769 {
 770         struct switch_dev *dev;
 771         int start = cb->args[0];
 772         int idx = 0;
 773
 774         swconfig_lock();
 775         list_for_each_entry(dev, &swdevs, dev_list) {
 776                 if (++idx <= start)
 777                         continue;
 778                 if (swconfig_send_switch(skb, NETLINK_CB(cb->skb).pid,
 779                                 cb->nlh->nlmsg_seq, NLM_F_MULTI,
 780                                 dev) < 0)
 781                         break;
 782         }
 783         swconfig_unlock();
 784         cb->args[0] = idx;
 785
 786         return skb->len;
 787 }
 788
 789 static int
 790 swconfig_done(struct netlink_callback *cb)
 791 {
 792         return 0;
 793 }
 794
 795 static struct genl_ops swconfig_ops[] = {
 796         {
 797                 .cmd = SWITCH_CMD_LIST_GLOBAL,
 798                 .doit = swconfig_list_attrs,
 799                 .policy = switch_policy,
 800         },
 801         {
 802                 .cmd = SWITCH_CMD_LIST_VLAN,
 803                 .doit = swconfig_list_attrs,
 804                 .policy = switch_policy,
 805         },
 806         {
 807                 .cmd = SWITCH_CMD_LIST_PORT,
 808                 .doit = swconfig_list_attrs,
 809                 .policy = switch_policy,
 810         },
 811         {
 812                 .cmd = SWITCH_CMD_GET_GLOBAL,
 813                 .doit = swconfig_get_attr,
 814                 .policy = switch_policy,
 815         },
 816         {
 817                 .cmd = SWITCH_CMD_GET_VLAN,
 818                 .doit = swconfig_get_attr,
 819                 .policy = switch_policy,
 820         },
 821         {
 822                 .cmd = SWITCH_CMD_GET_PORT,
 823                 .doit = swconfig_get_attr,
 824                 .policy = switch_policy,
 825         },
 826         {
 827                 .cmd = SWITCH_CMD_SET_GLOBAL,
 828                 .doit = swconfig_set_attr,
 829                 .policy = switch_policy,
 830         },
 831         {
 832                 .cmd = SWITCH_CMD_SET_VLAN,
 833                 .doit = swconfig_set_attr,
 834                 .policy = switch_policy,
 835         },
 836         {
 837                 .cmd = SWITCH_CMD_SET_PORT,
 838                 .doit = swconfig_set_attr,
 839                 .policy = switch_policy,
 840         },
 841         {
 842                 .cmd = SWITCH_CMD_GET_SWITCH,
 843                 .dumpit = swconfig_dump_switches,
 844                 .policy = switch_policy,
 845                 .done = swconfig_done,
 846         }
 847 };
 848
 849 int
 850 register_switch(struct switch_dev *dev, struct net_device *netdev)
 851 {
 852         INIT_LIST_HEAD(&dev->dev_list);
 853         if (netdev) {
 854                 dev->netdev = netdev;
 855                 if (!dev->devname)
 856                         dev->devname = netdev->name;
 857         }
 858         BUG_ON(!dev->devname);
 859
 860         if (dev->ports > 0) {
 861                 dev->portbuf = kzalloc(sizeof(struct switch_port) * dev->ports,
 862                                 GFP_KERNEL);
 863                 if (!dev->portbuf)
 864                         return -ENOMEM;
 865         }
 866         dev->id = ++swdev_id;
 867         swconfig_defaults_init(dev);
 868         spin_lock_init(&dev->lock);
 869         swconfig_lock();
 870         list_add(&dev->dev_list, &swdevs);
 871         swconfig_unlock();
 872
 873         return 0;
 874 }
 875 EXPORT_SYMBOL_GPL(register_switch);
 876
 877 void
 878 unregister_switch(struct switch_dev *dev)
 879 {
 880         kfree(dev->portbuf);
 881         spin_lock(&dev->lock);
 882         swconfig_lock();
 883         list_del(&dev->dev_list);
 884         swconfig_unlock();
 885 }
 886 EXPORT_SYMBOL_GPL(unregister_switch);
 887
 888
 889 static int __init
 890 swconfig_init(void)
 891 {
 892         int i, err;
 893
 894         INIT_LIST_HEAD(&swdevs);
 895         err = genl_register_family(&switch_fam);
 896         if (err)
 897                 return err;
 898
 899         for (i = 0; i < ARRAY_SIZE(swconfig_ops); i++) {
 900                 err = genl_register_ops(&switch_fam, &swconfig_ops[i]);
 901                 if (err)
 902                         goto unregister;
 903         }
 904
 905         return 0;
 906
 907 unregister:
 908         genl_unregister_family(&switch_fam);
 909         return err;
 910 }
 911
 912 static void __exit
 913 swconfig_exit(void)
 914 {
 915         genl_unregister_family(&switch_fam);
 916 }
 917
 918 module_init(swconfig_init);
 919 module_exit(swconfig_exit);
 920