SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/decnet/dn_dev.c

   1 /*
   2  * DECnet       An implementation of the DECnet protocol suite for the LINUX
   3  *              operating system.  DECnet is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              DECnet Device Layer
   7  *
   8  * Authors:     Steve Whitehouse <SteveW@ACM.org>
   9  *              Eduardo Marcelo Serrat <emserrat@geocities.com>
  10  *
  11  * Changes:
  12  *          Steve Whitehouse : Devices now see incoming frames so they
  13  *                             can mark on who it came from.
  14  *          Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
  15  *                             can now have a device specific setup func.
  16  *          Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
  17  *          Steve Whitehouse : Fixed bug which sometimes killed timer
  18  *          Steve Whitehouse : Multiple ifaddr support
  19  *          Steve Whitehouse : SIOCGIFCONF is now a compile time option
  20  *          Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
  21  *          Steve Whitehouse : Removed timer1 - it's a user space issue now
  22  *         Patrick Caulfield : Fixed router hello message format
  23  *          Steve Whitehouse : Got rid of constant sizes for blksize for
  24  *                             devices. All mtu based now.
  25  */
  26
  27 #include <linux/capability.h>
  28 #include <linux/module.h>
  29 #include <linux/moduleparam.h>
  30 #include <linux/init.h>
  31 #include <linux/net.h>
  32 #include <linux/netdevice.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/timer.h>
  36 #include <linux/string.h>
  37 #include <linux/if_addr.h>
  38 #include <linux/if_arp.h>
  39 #include <linux/if_ether.h>
  40 #include <linux/skbuff.h>
  41 #include <linux/sysctl.h>
  42 #include <linux/notifier.h>
  43 #include <asm/uaccess.h>
  44 #include <asm/system.h>
  45 #include <net/net_namespace.h>
  46 #include <net/neighbour.h>
  47 #include <net/dst.h>
  48 #include <net/flow.h>
  49 #include <net/fib_rules.h>
  50 #include <net/netlink.h>
  51 #include <net/dn.h>
  52 #include <net/dn_dev.h>
  53 #include <net/dn_route.h>
  54 #include <net/dn_neigh.h>
  55 #include <net/dn_fib.h>
  56
  57 #define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
  58
  59 static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
  60 static char dn_rt_all_rt_mcast[ETH_ALEN]  = {0xAB,0x00,0x00,0x03,0x00,0x00};
  61 static char dn_hiord[ETH_ALEN]            = {0xAA,0x00,0x04,0x00,0x00,0x00};
  62 static unsigned char dn_eco_version[3]    = {0x02,0x00,0x00};
  63
  64 extern struct neigh_table dn_neigh_table;
  65
  66 /*
  67  * decnet_address is kept in network order.
  68  */
  69 __le16 decnet_address = 0;
  70
  71 static DEFINE_RWLOCK(dndev_lock);
  72 static struct net_device *decnet_default_device;
  73 static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
  74
  75 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
  76 static void dn_dev_delete(struct net_device *dev);
  77 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
  78
  79 static int dn_eth_up(struct net_device *);
  80 static void dn_eth_down(struct net_device *);
  81 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  82 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  83
  84 static struct dn_dev_parms dn_dev_list[] =  {
  85 {
  86         .type =         ARPHRD_ETHER, /* Ethernet */
  87         .mode =         DN_DEV_BCAST,
  88         .state =        DN_DEV_S_RU,
  89         .t2 =           1,
  90         .t3 =           10,
  91         .name =         "ethernet",
  92         .ctl_name =     NET_DECNET_CONF_ETHER,
  93         .up =           dn_eth_up,
  94         .down =         dn_eth_down,
  95         .timer3 =       dn_send_brd_hello,
  96 },
  97 {
  98         .type =         ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
  99         .mode =         DN_DEV_BCAST,
 100         .state =        DN_DEV_S_RU,
 101         .t2 =           1,
 102         .t3 =           10,
 103         .name =         "ipgre",
 104         .ctl_name =     NET_DECNET_CONF_GRE,
 105         .timer3 =       dn_send_brd_hello,
 106 },
 107 #if 0
 108 {
 109         .type =         ARPHRD_X25, /* Bog standard X.25 */
 110         .mode =         DN_DEV_UCAST,
 111         .state =        DN_DEV_S_DS,
 112         .t2 =           1,
 113         .t3 =           120,
 114         .name =         "x25",
 115         .ctl_name =     NET_DECNET_CONF_X25,
 116         .timer3 =       dn_send_ptp_hello,
 117 },
 118 #endif
 119 #if 0
 120 {
 121         .type =         ARPHRD_PPP, /* DECnet over PPP */
 122         .mode =         DN_DEV_BCAST,
 123         .state =        DN_DEV_S_RU,
 124         .t2 =           1,
 125         .t3 =           10,
 126         .name =         "ppp",
 127         .ctl_name =     NET_DECNET_CONF_PPP,
 128         .timer3 =       dn_send_brd_hello,
 129 },
 130 #endif
 131 {
 132         .type =         ARPHRD_DDCMP, /* DECnet over DDCMP */
 133         .mode =         DN_DEV_UCAST,
 134         .state =        DN_DEV_S_DS,
 135         .t2 =           1,
 136         .t3 =           120,
 137         .name =         "ddcmp",
 138         .ctl_name =     NET_DECNET_CONF_DDCMP,
 139         .timer3 =       dn_send_ptp_hello,
 140 },
 141 {
 142         .type =         ARPHRD_LOOPBACK, /* Loopback interface - always last */
 143         .mode =         DN_DEV_BCAST,
 144         .state =        DN_DEV_S_RU,
 145         .t2 =           1,
 146         .t3 =           10,
 147         .name =         "loopback",
 148         .ctl_name =     NET_DECNET_CONF_LOOPBACK,
 149         .timer3 =       dn_send_brd_hello,
 150 }
 151 };
 152
 153 #define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
 154
 155 #define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
 156
 157 #ifdef CONFIG_SYSCTL
 158
 159 static int min_t2[] = { 1 };
 160 static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
 161 static int min_t3[] = { 1 };
 162 static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
 163
 164 static int min_priority[1];
 165 static int max_priority[] = { 127 }; /* From DECnet spec */
 166
 167 static int dn_forwarding_proc(ctl_table *, int, struct file *,
 168                         void __user *, size_t *, loff_t *);
 169 static int dn_forwarding_sysctl(ctl_table *table,
 170                         void __user *oldval, size_t __user *oldlenp,
 171                         void __user *newval, size_t newlen);
 172
 173 static struct dn_dev_sysctl_table {
 174         struct ctl_table_header *sysctl_header;
 175         ctl_table dn_dev_vars[5];
 176 } dn_dev_sysctl = {
 177         NULL,
 178         {
 179         {
 180                 .ctl_name = NET_DECNET_CONF_DEV_FORWARDING,
 181                 .procname = "forwarding",
 182                 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
 183                 .maxlen = sizeof(int),
 184                 .mode = 0644,
 185                 .proc_handler = dn_forwarding_proc,
 186                 .strategy = dn_forwarding_sysctl,
 187         },
 188         {
 189                 .ctl_name = NET_DECNET_CONF_DEV_PRIORITY,
 190                 .procname = "priority",
 191                 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
 192                 .maxlen = sizeof(int),
 193                 .mode = 0644,
 194                 .proc_handler = proc_dointvec_minmax,
 195                 .strategy = sysctl_intvec,
 196                 .extra1 = &min_priority,
 197                 .extra2 = &max_priority
 198         },
 199         {
 200                 .ctl_name = NET_DECNET_CONF_DEV_T2,
 201                 .procname = "t2",
 202                 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
 203                 .maxlen = sizeof(int),
 204                 .mode = 0644,
 205                 .proc_handler = proc_dointvec_minmax,
 206                 .strategy = sysctl_intvec,
 207                 .extra1 = &min_t2,
 208                 .extra2 = &max_t2
 209         },
 210         {
 211                 .ctl_name = NET_DECNET_CONF_DEV_T3,
 212                 .procname = "t3",
 213                 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
 214                 .maxlen = sizeof(int),
 215                 .mode = 0644,
 216                 .proc_handler = proc_dointvec_minmax,
 217                 .strategy = sysctl_intvec,
 218                 .extra1 = &min_t3,
 219                 .extra2 = &max_t3
 220         },
 221         {0}
 222         },
 223 };
 224
 225 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 226 {
 227         struct dn_dev_sysctl_table *t;
 228         int i;
 229
 230 #define DN_CTL_PATH_DEV 3
 231
 232         struct ctl_path dn_ctl_path[] = {
 233                 { .procname = "net", .ctl_name = CTL_NET, },
 234                 { .procname = "decnet", .ctl_name = NET_DECNET, },
 235                 { .procname = "conf", .ctl_name = NET_DECNET_CONF, },
 236                 { /* to be set */ },
 237                 { },
 238         };
 239
 240         t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
 241         if (t == NULL)
 242                 return;
 243
 244         for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
 245                 long offset = (long)t->dn_dev_vars[i].data;
 246                 t->dn_dev_vars[i].data = ((char *)parms) + offset;
 247         }
 248
 249         if (dev) {
 250                 dn_ctl_path[DN_CTL_PATH_DEV].procname = dev->name;
 251                 dn_ctl_path[DN_CTL_PATH_DEV].ctl_name = dev->ifindex;
 252         } else {
 253                 dn_ctl_path[DN_CTL_PATH_DEV].procname = parms->name;
 254                 dn_ctl_path[DN_CTL_PATH_DEV].ctl_name = parms->ctl_name;
 255         }
 256
 257         t->dn_dev_vars[0].extra1 = (void *)dev;
 258
 259         t->sysctl_header = register_sysctl_paths(dn_ctl_path, t->dn_dev_vars);
 260         if (t->sysctl_header == NULL)
 261                 kfree(t);
 262         else
 263                 parms->sysctl = t;
 264 }
 265
 266 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 267 {
 268         if (parms->sysctl) {
 269                 struct dn_dev_sysctl_table *t = parms->sysctl;
 270                 parms->sysctl = NULL;
 271                 unregister_sysctl_table(t->sysctl_header);
 272                 kfree(t);
 273         }
 274 }
 275
 276 static int dn_forwarding_proc(ctl_table *table, int write,
 277                                 struct file *filep,
 278                                 void __user *buffer,
 279                                 size_t *lenp, loff_t *ppos)
 280 {
 281 #ifdef CONFIG_DECNET_ROUTER
 282         struct net_device *dev = table->extra1;
 283         struct dn_dev *dn_db;
 284         int err;
 285         int tmp, old;
 286
 287         if (table->extra1 == NULL)
 288                 return -EINVAL;
 289
 290         dn_db = dev->dn_ptr;
 291         old = dn_db->parms.forwarding;
 292
 293         err = proc_dointvec(table, write, filep, buffer, lenp, ppos);
 294
 295         if ((err >= 0) && write) {
 296                 if (dn_db->parms.forwarding < 0)
 297                         dn_db->parms.forwarding = 0;
 298                 if (dn_db->parms.forwarding > 2)
 299                         dn_db->parms.forwarding = 2;
 300                 /*
 301                  * What an ugly hack this is... its works, just. It
 302                  * would be nice if sysctl/proc were just that little
 303                  * bit more flexible so I don't have to write a special
 304                  * routine, or suffer hacks like this - SJW
 305                  */
 306                 tmp = dn_db->parms.forwarding;
 307                 dn_db->parms.forwarding = old;
 308                 if (dn_db->parms.down)
 309                         dn_db->parms.down(dev);
 310                 dn_db->parms.forwarding = tmp;
 311                 if (dn_db->parms.up)
 312                         dn_db->parms.up(dev);
 313         }
 314
 315         return err;
 316 #else
 317         return -EINVAL;
 318 #endif
 319 }
 320
 321 static int dn_forwarding_sysctl(ctl_table *table,
 322                         void __user *oldval, size_t __user *oldlenp,
 323                         void __user *newval, size_t newlen)
 324 {
 325 #ifdef CONFIG_DECNET_ROUTER
 326         struct net_device *dev = table->extra1;
 327         struct dn_dev *dn_db;
 328         int value;
 329
 330         if (table->extra1 == NULL)
 331                 return -EINVAL;
 332
 333         dn_db = dev->dn_ptr;
 334
 335         if (newval && newlen) {
 336                 if (newlen != sizeof(int))
 337                         return -EINVAL;
 338
 339                 if (get_user(value, (int __user *)newval))
 340                         return -EFAULT;
 341                 if (value < 0)
 342                         return -EINVAL;
 343                 if (value > 2)
 344                         return -EINVAL;
 345
 346                 if (dn_db->parms.down)
 347                         dn_db->parms.down(dev);
 348                 dn_db->parms.forwarding = value;
 349                 if (dn_db->parms.up)
 350                         dn_db->parms.up(dev);
 351         }
 352
 353         return 0;
 354 #else
 355         return -EINVAL;
 356 #endif
 357 }
 358
 359 #else /* CONFIG_SYSCTL */
 360 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 361 {
 362 }
 363 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 364 {
 365 }
 366
 367 #endif /* CONFIG_SYSCTL */
 368
 369 static inline __u16 mtu2blksize(struct net_device *dev)
 370 {
 371         u32 blksize = dev->mtu;
 372         if (blksize > 0xffff)
 373                 blksize = 0xffff;
 374
 375         if (dev->type == ARPHRD_ETHER ||
 376             dev->type == ARPHRD_PPP ||
 377             dev->type == ARPHRD_IPGRE ||
 378             dev->type == ARPHRD_LOOPBACK)
 379                 blksize -= 2;
 380
 381         return (__u16)blksize;
 382 }
 383
 384 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
 385 {
 386         struct dn_ifaddr *ifa;
 387
 388         ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
 389
 390         return ifa;
 391 }
 392
 393 static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
 394 {
 395         kfree(ifa);
 396 }
 397
 398 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
 399 {
 400         struct dn_ifaddr *ifa1 = *ifap;
 401         unsigned char mac_addr[6];
 402         struct net_device *dev = dn_db->dev;
 403
 404         ASSERT_RTNL();
 405
 406         *ifap = ifa1->ifa_next;
 407
 408         if (dn_db->dev->type == ARPHRD_ETHER) {
 409                 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
 410                         dn_dn2eth(mac_addr, ifa1->ifa_local);
 411                         dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
 412                 }
 413         }
 414
 415         dn_ifaddr_notify(RTM_DELADDR, ifa1);
 416         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
 417         if (destroy) {
 418                 dn_dev_free_ifa(ifa1);
 419
 420                 if (dn_db->ifa_list == NULL)
 421                         dn_dev_delete(dn_db->dev);
 422         }
 423 }
 424
 425 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 426 {
 427         struct net_device *dev = dn_db->dev;
 428         struct dn_ifaddr *ifa1;
 429         unsigned char mac_addr[6];
 430
 431         ASSERT_RTNL();
 432
 433         /* Check for duplicates */
 434         for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
 435                 if (ifa1->ifa_local == ifa->ifa_local)
 436                         return -EEXIST;
 437         }
 438
 439         if (dev->type == ARPHRD_ETHER) {
 440                 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
 441                         dn_dn2eth(mac_addr, ifa->ifa_local);
 442                         dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
 443                 }
 444         }
 445
 446         ifa->ifa_next = dn_db->ifa_list;
 447         dn_db->ifa_list = ifa;
 448
 449         dn_ifaddr_notify(RTM_NEWADDR, ifa);
 450         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
 451
 452         return 0;
 453 }
 454
 455 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
 456 {
 457         struct dn_dev *dn_db = dev->dn_ptr;
 458         int rv;
 459
 460         if (dn_db == NULL) {
 461                 int err;
 462                 dn_db = dn_dev_create(dev, &err);
 463                 if (dn_db == NULL)
 464                         return err;
 465         }
 466
 467         ifa->ifa_dev = dn_db;
 468
 469         if (dev->flags & IFF_LOOPBACK)
 470                 ifa->ifa_scope = RT_SCOPE_HOST;
 471
 472         rv = dn_dev_insert_ifa(dn_db, ifa);
 473         if (rv)
 474                 dn_dev_free_ifa(ifa);
 475         return rv;
 476 }
 477
 478
 479 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
 480 {
 481         char buffer[DN_IFREQ_SIZE];
 482         struct ifreq *ifr = (struct ifreq *)buffer;
 483         struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
 484         struct dn_dev *dn_db;
 485         struct net_device *dev;
 486         struct dn_ifaddr *ifa = NULL, **ifap = NULL;
 487         int ret = 0;
 488
 489         if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
 490                 return -EFAULT;
 491         ifr->ifr_name[IFNAMSIZ-1] = 0;
 492
 493         dev_load(&init_net, ifr->ifr_name);
 494
 495         switch(cmd) {
 496                 case SIOCGIFADDR:
 497                         break;
 498                 case SIOCSIFADDR:
 499                         if (!capable(CAP_NET_ADMIN))
 500                                 return -EACCES;
 501                         if (sdn->sdn_family != AF_DECnet)
 502                                 return -EINVAL;
 503                         break;
 504                 default:
 505                         return -EINVAL;
 506         }
 507
 508         rtnl_lock();
 509
 510         if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
 511                 ret = -ENODEV;
 512                 goto done;
 513         }
 514
 515         if ((dn_db = dev->dn_ptr) != NULL) {
 516                 for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
 517                         if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
 518                                 break;
 519         }
 520
 521         if (ifa == NULL && cmd != SIOCSIFADDR) {
 522                 ret = -EADDRNOTAVAIL;
 523                 goto done;
 524         }
 525
 526         switch(cmd) {
 527                 case SIOCGIFADDR:
 528                         *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
 529                         goto rarok;
 530
 531                 case SIOCSIFADDR:
 532                         if (!ifa) {
 533                                 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
 534                                         ret = -ENOBUFS;
 535                                         break;
 536                                 }
 537                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 538                         } else {
 539                                 if (ifa->ifa_local == dn_saddr2dn(sdn))
 540                                         break;
 541                                 dn_dev_del_ifa(dn_db, ifap, 0);
 542                         }
 543
 544                         ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
 545
 546                         ret = dn_dev_set_ifa(dev, ifa);
 547         }
 548 done:
 549         rtnl_unlock();
 550
 551         return ret;
 552 rarok:
 553         if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
 554                 ret = -EFAULT;
 555         goto done;
 556 }
 557
 558 struct net_device *dn_dev_get_default(void)
 559 {
 560         struct net_device *dev;
 561         read_lock(&dndev_lock);
 562         dev = decnet_default_device;
 563         if (dev) {
 564                 if (dev->dn_ptr)
 565                         dev_hold(dev);
 566                 else
 567                         dev = NULL;
 568         }
 569         read_unlock(&dndev_lock);
 570         return dev;
 571 }
 572
 573 int dn_dev_set_default(struct net_device *dev, int force)
 574 {
 575         struct net_device *old = NULL;
 576         int rv = -EBUSY;
 577         if (!dev->dn_ptr)
 578                 return -ENODEV;
 579         write_lock(&dndev_lock);
 580         if (force || decnet_default_device == NULL) {
 581                 old = decnet_default_device;
 582                 decnet_default_device = dev;
 583                 rv = 0;
 584         }
 585         write_unlock(&dndev_lock);
 586         if (old)
 587                 dev_put(old);
 588         return rv;
 589 }
 590
 591 static void dn_dev_check_default(struct net_device *dev)
 592 {
 593         write_lock(&dndev_lock);
 594         if (dev == decnet_default_device) {
 595                 decnet_default_device = NULL;
 596         } else {
 597                 dev = NULL;
 598         }
 599         write_unlock(&dndev_lock);
 600         if (dev)
 601                 dev_put(dev);
 602 }
 603
 604 static struct dn_dev *dn_dev_by_index(int ifindex)
 605 {
 606         struct net_device *dev;
 607         struct dn_dev *dn_dev = NULL;
 608         dev = dev_get_by_index(&init_net, ifindex);
 609         if (dev) {
 610                 dn_dev = dev->dn_ptr;
 611                 dev_put(dev);
 612         }
 613
 614         return dn_dev;
 615 }
 616
 617 static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
 618         [IFA_ADDRESS]           = { .type = NLA_U16 },
 619         [IFA_LOCAL]             = { .type = NLA_U16 },
 620         [IFA_LABEL]             = { .type = NLA_STRING,
 621                                     .len = IFNAMSIZ - 1 },
 622 };
 623
 624 static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 625 {
 626         struct net *net = sock_net(skb->sk);
 627         struct nlattr *tb[IFA_MAX+1];
 628         struct dn_dev *dn_db;
 629         struct ifaddrmsg *ifm;
 630         struct dn_ifaddr *ifa, **ifap;
 631         int err = -EINVAL;
 632
 633         if (net != &init_net)
 634                 goto errout;
 635
 636         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
 637         if (err < 0)
 638                 goto errout;
 639
 640         err = -ENODEV;
 641         ifm = nlmsg_data(nlh);
 642         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
 643                 goto errout;
 644
 645         err = -EADDRNOTAVAIL;
 646         for (ifap = &dn_db->ifa_list; (ifa = *ifap); ifap = &ifa->ifa_next) {
 647                 if (tb[IFA_LOCAL] &&
 648                     nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
 649                         continue;
 650
 651                 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
 652                         continue;
 653
 654                 dn_dev_del_ifa(dn_db, ifap, 1);
 655                 return 0;
 656         }
 657
 658 errout:
 659         return err;
 660 }
 661
 662 static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 663 {
 664         struct net *net = sock_net(skb->sk);
 665         struct nlattr *tb[IFA_MAX+1];
 666         struct net_device *dev;
 667         struct dn_dev *dn_db;
 668         struct ifaddrmsg *ifm;
 669         struct dn_ifaddr *ifa;
 670         int err;
 671
 672         if (net != &init_net)
 673                 return -EINVAL;
 674
 675         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
 676         if (err < 0)
 677                 return err;
 678
 679         if (tb[IFA_LOCAL] == NULL)
 680                 return -EINVAL;
 681
 682         ifm = nlmsg_data(nlh);
 683         if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
 684                 return -ENODEV;
 685
 686         if ((dn_db = dev->dn_ptr) == NULL) {
 687                 dn_db = dn_dev_create(dev, &err);
 688                 if (!dn_db)
 689                         return err;
 690         }
 691
 692         if ((ifa = dn_dev_alloc_ifa()) == NULL)
 693                 return -ENOBUFS;
 694
 695         if (tb[IFA_ADDRESS] == NULL)
 696                 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
 697
 698         ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
 699         ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
 700         ifa->ifa_flags = ifm->ifa_flags;
 701         ifa->ifa_scope = ifm->ifa_scope;
 702         ifa->ifa_dev = dn_db;
 703
 704         if (tb[IFA_LABEL])
 705                 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
 706         else
 707                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 708
 709         err = dn_dev_insert_ifa(dn_db, ifa);
 710         if (err)
 711                 dn_dev_free_ifa(ifa);
 712
 713         return err;
 714 }
 715
 716 static inline size_t dn_ifaddr_nlmsg_size(void)
 717 {
 718         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
 719                + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
 720                + nla_total_size(2) /* IFA_ADDRESS */
 721                + nla_total_size(2); /* IFA_LOCAL */
 722 }
 723
 724 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
 725                              u32 pid, u32 seq, int event, unsigned int flags)
 726 {
 727         struct ifaddrmsg *ifm;
 728         struct nlmsghdr *nlh;
 729
 730         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
 731         if (nlh == NULL)
 732                 return -EMSGSIZE;
 733
 734         ifm = nlmsg_data(nlh);
 735         ifm->ifa_family = AF_DECnet;
 736         ifm->ifa_prefixlen = 16;
 737         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
 738         ifm->ifa_scope = ifa->ifa_scope;
 739         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
 740
 741         if (ifa->ifa_address)
 742                 NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
 743         if (ifa->ifa_local)
 744                 NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
 745         if (ifa->ifa_label[0])
 746                 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
 747
 748         return nlmsg_end(skb, nlh);
 749
 750 nla_put_failure:
 751         nlmsg_cancel(skb, nlh);
 752         return -EMSGSIZE;
 753 }
 754
 755 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
 756 {
 757         struct sk_buff *skb;
 758         int err = -ENOBUFS;
 759
 760         skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
 761         if (skb == NULL)
 762                 goto errout;
 763
 764         err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
 765         if (err < 0) {
 766                 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
 767                 WARN_ON(err == -EMSGSIZE);
 768                 kfree_skb(skb);
 769                 goto errout;
 770         }
 771         rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
 772         return;
 773 errout:
 774         if (err < 0)
 775                 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
 776 }
 777
 778 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 779 {
 780         struct net *net = sock_net(skb->sk);
 781         int idx, dn_idx = 0, skip_ndevs, skip_naddr;
 782         struct net_device *dev;
 783         struct dn_dev *dn_db;
 784         struct dn_ifaddr *ifa;
 785
 786         if (net != &init_net)
 787                 return 0;
 788
 789         skip_ndevs = cb->args[0];
 790         skip_naddr = cb->args[1];
 791
 792         idx = 0;
 793         for_each_netdev(&init_net, dev) {
 794                 if (idx < skip_ndevs)
 795                         goto cont;
 796                 else if (idx > skip_ndevs) {
 797                         /* Only skip over addresses for first dev dumped
 798                          * in this iteration (idx == skip_ndevs) */
 799                         skip_naddr = 0;
 800                 }
 801
 802                 if ((dn_db = dev->dn_ptr) == NULL)
 803                         goto cont;
 804
 805                 for (ifa = dn_db->ifa_list, dn_idx = 0; ifa;
 806                      ifa = ifa->ifa_next, dn_idx++) {
 807                         if (dn_idx < skip_naddr)
 808                                 continue;
 809
 810                         if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
 811                                               cb->nlh->nlmsg_seq, RTM_NEWADDR,
 812                                               NLM_F_MULTI) < 0)
 813                                 goto done;
 814                 }
 815 cont:
 816                 idx++;
 817         }
 818 done:
 819         cb->args[0] = idx;
 820         cb->args[1] = dn_idx;
 821
 822         return skb->len;
 823 }
 824
 825 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
 826 {
 827         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 828         struct dn_ifaddr *ifa;
 829         int rv = -ENODEV;
 830         if (dn_db == NULL)
 831                 goto out;
 832         ifa = dn_db->ifa_list;
 833         if (ifa != NULL) {
 834                 *addr = ifa->ifa_local;
 835                 rv = 0;
 836         }
 837 out:
 838         return rv;
 839 }
 840
 841 /*
 842  * Find a default address to bind to.
 843  *
 844  * This is one of those areas where the initial VMS concepts don't really
 845  * map onto the Linux concepts, and since we introduced multiple addresses
 846  * per interface we have to cope with slightly odd ways of finding out what
 847  * "our address" really is. Mostly it's not a problem; for this we just guess
 848  * a sensible default. Eventually the routing code will take care of all the
 849  * nasties for us I hope.
 850  */
 851 int dn_dev_bind_default(__le16 *addr)
 852 {
 853         struct net_device *dev;
 854         int rv;
 855         dev = dn_dev_get_default();
 856 last_chance:
 857         if (dev) {
 858                 read_lock(&dev_base_lock);
 859                 rv = dn_dev_get_first(dev, addr);
 860                 read_unlock(&dev_base_lock);
 861                 dev_put(dev);
 862                 if (rv == 0 || dev == init_net.loopback_dev)
 863                         return rv;
 864         }
 865         dev = init_net.loopback_dev;
 866         dev_hold(dev);
 867         goto last_chance;
 868 }
 869
 870 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 871 {
 872         struct endnode_hello_message *msg;
 873         struct sk_buff *skb = NULL;
 874         __le16 *pktlen;
 875         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 876
 877         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
 878                 return;
 879
 880         skb->dev = dev;
 881
 882         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
 883
 884         msg->msgflg  = 0x0D;
 885         memcpy(msg->tiver, dn_eco_version, 3);
 886         dn_dn2eth(msg->id, ifa->ifa_local);
 887         msg->iinfo   = DN_RT_INFO_ENDN;
 888         msg->blksize = cpu_to_le16(mtu2blksize(dev));
 889         msg->area    = 0x00;
 890         memset(msg->seed, 0, 8);
 891         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
 892
 893         if (dn_db->router) {
 894                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 895                 dn_dn2eth(msg->neighbor, dn->addr);
 896         }
 897
 898         msg->timer   = cpu_to_le16((unsigned short)dn_db->parms.t3);
 899         msg->mpd     = 0x00;
 900         msg->datalen = 0x02;
 901         memset(msg->data, 0xAA, 2);
 902
 903         pktlen = (__le16 *)skb_push(skb,2);
 904         *pktlen = cpu_to_le16(skb->len - 2);
 905
 906         skb_reset_network_header(skb);
 907
 908         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
 909 }
 910
 911
 912 #define DRDELAY (5 * HZ)
 913
 914 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 915 {
 916         /* First check time since device went up */
 917         if ((jiffies - dn_db->uptime) < DRDELAY)
 918                 return 0;
 919
 920         /* If there is no router, then yes... */
 921         if (!dn_db->router)
 922                 return 1;
 923
 924         /* otherwise only if we have a higher priority or.. */
 925         if (dn->priority < dn_db->parms.priority)
 926                 return 1;
 927
 928         /* if we have equal priority and a higher node number */
 929         if (dn->priority != dn_db->parms.priority)
 930                 return 0;
 931
 932         if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
 933                 return 1;
 934
 935         return 0;
 936 }
 937
 938 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 939 {
 940         int n;
 941         struct dn_dev *dn_db = dev->dn_ptr;
 942         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 943         struct sk_buff *skb;
 944         size_t size;
 945         unsigned char *ptr;
 946         unsigned char *i1, *i2;
 947         __le16 *pktlen;
 948         char *src;
 949
 950         if (mtu2blksize(dev) < (26 + 7))
 951                 return;
 952
 953         n = mtu2blksize(dev) - 26;
 954         n /= 7;
 955
 956         if (n > 32)
 957                 n = 32;
 958
 959         size = 2 + 26 + 7 * n;
 960
 961         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
 962                 return;
 963
 964         skb->dev = dev;
 965         ptr = skb_put(skb, size);
 966
 967         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
 968         *ptr++ = 2; /* ECO */
 969         *ptr++ = 0;
 970         *ptr++ = 0;
 971         dn_dn2eth(ptr, ifa->ifa_local);
 972         src = ptr;
 973         ptr += ETH_ALEN;
 974         *ptr++ = dn_db->parms.forwarding == 1 ?
 975                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
 976         *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
 977         ptr += 2;
 978         *ptr++ = dn_db->parms.priority; /* Priority */
 979         *ptr++ = 0; /* Area: Reserved */
 980         *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
 981         ptr += 2;
 982         *ptr++ = 0; /* MPD: Reserved */
 983         i1 = ptr++;
 984         memset(ptr, 0, 7); /* Name: Reserved */
 985         ptr += 7;
 986         i2 = ptr++;
 987
 988         n = dn_neigh_elist(dev, ptr, n);
 989
 990         *i2 = 7 * n;
 991         *i1 = 8 + *i2;
 992
 993         skb_trim(skb, (27 + *i2));
 994
 995         pktlen = (__le16 *)skb_push(skb, 2);
 996         *pktlen = cpu_to_le16(skb->len - 2);
 997
 998         skb_reset_network_header(skb);
 999
1000         if (dn_am_i_a_router(dn, dn_db, ifa)) {
1001                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
1002                 if (skb2) {
1003                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
1004                 }
1005         }
1006
1007         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1008 }
1009
1010 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1011 {
1012         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1013
1014         if (dn_db->parms.forwarding == 0)
1015                 dn_send_endnode_hello(dev, ifa);
1016         else
1017                 dn_send_router_hello(dev, ifa);
1018 }
1019
1020 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1021 {
1022         int tdlen = 16;
1023         int size = dev->hard_header_len + 2 + 4 + tdlen;
1024         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1025         int i;
1026         unsigned char *ptr;
1027         char src[ETH_ALEN];
1028
1029         if (skb == NULL)
1030                 return ;
1031
1032         skb->dev = dev;
1033         skb_push(skb, dev->hard_header_len);
1034         ptr = skb_put(skb, 2 + 4 + tdlen);
1035
1036         *ptr++ = DN_RT_PKT_HELO;
1037         *((__le16 *)ptr) = ifa->ifa_local;
1038         ptr += 2;
1039         *ptr++ = tdlen;
1040
1041         for(i = 0; i < tdlen; i++)
1042                 *ptr++ = 0252;
1043
1044         dn_dn2eth(src, ifa->ifa_local);
1045         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1046 }
1047
1048 static int dn_eth_up(struct net_device *dev)
1049 {
1050         struct dn_dev *dn_db = dev->dn_ptr;
1051
1052         if (dn_db->parms.forwarding == 0)
1053                 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1054         else
1055                 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1056
1057         dn_db->use_long = 1;
1058
1059         return 0;
1060 }
1061
1062 static void dn_eth_down(struct net_device *dev)
1063 {
1064         struct dn_dev *dn_db = dev->dn_ptr;
1065
1066         if (dn_db->parms.forwarding == 0)
1067                 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1068         else
1069                 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1070 }
1071
1072 static void dn_dev_set_timer(struct net_device *dev);
1073
1074 static void dn_dev_timer_func(unsigned long arg)
1075 {
1076         struct net_device *dev = (struct net_device *)arg;
1077         struct dn_dev *dn_db = dev->dn_ptr;
1078         struct dn_ifaddr *ifa;
1079
1080         if (dn_db->t3 <= dn_db->parms.t2) {
1081                 if (dn_db->parms.timer3) {
1082                         for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1083                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1084                                         dn_db->parms.timer3(dev, ifa);
1085                         }
1086                 }
1087                 dn_db->t3 = dn_db->parms.t3;
1088         } else {
1089                 dn_db->t3 -= dn_db->parms.t2;
1090         }
1091
1092         dn_dev_set_timer(dev);
1093 }
1094
1095 static void dn_dev_set_timer(struct net_device *dev)
1096 {
1097         struct dn_dev *dn_db = dev->dn_ptr;
1098
1099         if (dn_db->parms.t2 > dn_db->parms.t3)
1100                 dn_db->parms.t2 = dn_db->parms.t3;
1101
1102         dn_db->timer.data = (unsigned long)dev;
1103         dn_db->timer.function = dn_dev_timer_func;
1104         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1105
1106         add_timer(&dn_db->timer);
1107 }
1108
1109 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1110 {
1111         int i;
1112         struct dn_dev_parms *p = dn_dev_list;
1113         struct dn_dev *dn_db;
1114
1115         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1116                 if (p->type == dev->type)
1117                         break;
1118         }
1119
1120         *err = -ENODEV;
1121         if (i == DN_DEV_LIST_SIZE)
1122                 return NULL;
1123
1124         *err = -ENOBUFS;
1125         if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1126                 return NULL;
1127
1128         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1129         smp_wmb();
1130         dev->dn_ptr = dn_db;
1131         dn_db->dev = dev;
1132         init_timer(&dn_db->timer);
1133
1134         dn_db->uptime = jiffies;
1135
1136         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1137         if (!dn_db->neigh_parms) {
1138                 dev->dn_ptr = NULL;
1139                 kfree(dn_db);
1140                 return NULL;
1141         }
1142
1143         if (dn_db->parms.up) {
1144                 if (dn_db->parms.up(dev) < 0) {
1145                         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1146                         dev->dn_ptr = NULL;
1147                         kfree(dn_db);
1148                         return NULL;
1149                 }
1150         }
1151
1152         dn_dev_sysctl_register(dev, &dn_db->parms);
1153
1154         dn_dev_set_timer(dev);
1155
1156         *err = 0;
1157         return dn_db;
1158 }
1159
1160
1161 /*
1162  * This processes a device up event. We only start up
1163  * the loopback device & ethernet devices with correct
1164  * MAC addreses automatically. Others must be started
1165  * specifically.
1166  *
1167  * FIXME: How should we configure the loopback address ? If we could dispense
1168  * with using decnet_address here and for autobind, it will be one less thing
1169  * for users to worry about setting up.
1170  */
1171
1172 void dn_dev_up(struct net_device *dev)
1173 {
1174         struct dn_ifaddr *ifa;
1175         __le16 addr = decnet_address;
1176         int maybe_default = 0;
1177         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1178
1179         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1180                 return;
1181
1182         /*
1183          * Need to ensure that loopback device has a dn_db attached to it
1184          * to allow creation of neighbours against it, even though it might
1185          * not have a local address of its own. Might as well do the same for
1186          * all autoconfigured interfaces.
1187          */
1188         if (dn_db == NULL) {
1189                 int err;
1190                 dn_db = dn_dev_create(dev, &err);
1191                 if (dn_db == NULL)
1192                         return;
1193         }
1194
1195         if (dev->type == ARPHRD_ETHER) {
1196                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1197                         return;
1198                 addr = dn_eth2dn(dev->dev_addr);
1199                 maybe_default = 1;
1200         }
1201
1202         if (addr == 0)
1203                 return;
1204
1205         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1206                 return;
1207
1208         ifa->ifa_local = ifa->ifa_address = addr;
1209         ifa->ifa_flags = 0;
1210         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1211         strcpy(ifa->ifa_label, dev->name);
1212
1213         dn_dev_set_ifa(dev, ifa);
1214
1215         /*
1216          * Automagically set the default device to the first automatically
1217          * configured ethernet card in the system.
1218          */
1219         if (maybe_default) {
1220                 dev_hold(dev);
1221                 if (dn_dev_set_default(dev, 0))
1222                         dev_put(dev);
1223         }
1224 }
1225
1226 static void dn_dev_delete(struct net_device *dev)
1227 {
1228         struct dn_dev *dn_db = dev->dn_ptr;
1229
1230         if (dn_db == NULL)
1231                 return;
1232
1233         del_timer_sync(&dn_db->timer);
1234         dn_dev_sysctl_unregister(&dn_db->parms);
1235         dn_dev_check_default(dev);
1236         neigh_ifdown(&dn_neigh_table, dev);
1237
1238         if (dn_db->parms.down)
1239                 dn_db->parms.down(dev);
1240
1241         dev->dn_ptr = NULL;
1242
1243         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1244         neigh_ifdown(&dn_neigh_table, dev);
1245
1246         if (dn_db->router)
1247                 neigh_release(dn_db->router);
1248         if (dn_db->peer)
1249                 neigh_release(dn_db->peer);
1250
1251         kfree(dn_db);
1252 }
1253
1254 void dn_dev_down(struct net_device *dev)
1255 {
1256         struct dn_dev *dn_db = dev->dn_ptr;
1257         struct dn_ifaddr *ifa;
1258
1259         if (dn_db == NULL)
1260                 return;
1261
1262         while((ifa = dn_db->ifa_list) != NULL) {
1263                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1264                 dn_dev_free_ifa(ifa);
1265         }
1266
1267         dn_dev_delete(dev);
1268 }
1269
1270 void dn_dev_init_pkt(struct sk_buff *skb)
1271 {
1272         return;
1273 }
1274
1275 void dn_dev_veri_pkt(struct sk_buff *skb)
1276 {
1277         return;
1278 }
1279
1280 void dn_dev_hello(struct sk_buff *skb)
1281 {
1282         return;
1283 }
1284
1285 void dn_dev_devices_off(void)
1286 {
1287         struct net_device *dev;
1288
1289         rtnl_lock();
1290         for_each_netdev(&init_net, dev)
1291                 dn_dev_down(dev);
1292         rtnl_unlock();
1293
1294 }
1295
1296 void dn_dev_devices_on(void)
1297 {
1298         struct net_device *dev;
1299
1300         rtnl_lock();
1301         for_each_netdev(&init_net, dev) {
1302                 if (dev->flags & IFF_UP)
1303                         dn_dev_up(dev);
1304         }
1305         rtnl_unlock();
1306 }
1307
1308 int register_dnaddr_notifier(struct notifier_block *nb)
1309 {
1310         return blocking_notifier_chain_register(&dnaddr_chain, nb);
1311 }
1312
1313 int unregister_dnaddr_notifier(struct notifier_block *nb)
1314 {
1315         return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1316 }
1317
1318 #ifdef CONFIG_PROC_FS
1319 static inline int is_dn_dev(struct net_device *dev)
1320 {
1321         return dev->dn_ptr != NULL;
1322 }
1323
1324 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1325         __acquires(&dev_base_lock)
1326 {
1327         int i;
1328         struct net_device *dev;
1329
1330         read_lock(&dev_base_lock);
1331
1332         if (*pos == 0)
1333                 return SEQ_START_TOKEN;
1334
1335         i = 1;
1336         for_each_netdev(&init_net, dev) {
1337                 if (!is_dn_dev(dev))
1338                         continue;
1339
1340                 if (i++ == *pos)
1341                         return dev;
1342         }
1343
1344         return NULL;
1345 }
1346
1347 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1348 {
1349         struct net_device *dev;
1350
1351         ++*pos;
1352
1353         dev = (struct net_device *)v;
1354         if (v == SEQ_START_TOKEN)
1355                 dev = net_device_entry(&init_net.dev_base_head);
1356
1357         for_each_netdev_continue(&init_net, dev) {
1358                 if (!is_dn_dev(dev))
1359                         continue;
1360
1361                 return dev;
1362         }
1363
1364         return NULL;
1365 }
1366
1367 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1368         __releases(&dev_base_lock)
1369 {
1370         read_unlock(&dev_base_lock);
1371 }
1372
1373 static char *dn_type2asc(char type)
1374 {
1375         switch(type) {
1376                 case DN_DEV_BCAST:
1377                         return "B";
1378                 case DN_DEV_UCAST:
1379                         return "U";
1380                 case DN_DEV_MPOINT:
1381                         return "M";
1382         }
1383
1384         return "?";
1385 }
1386
1387 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1388 {
1389         if (v == SEQ_START_TOKEN)
1390                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1391         else {
1392                 struct net_device *dev = v;
1393                 char peer_buf[DN_ASCBUF_LEN];
1394                 char router_buf[DN_ASCBUF_LEN];
1395                 struct dn_dev *dn_db = dev->dn_ptr;
1396
1397                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1398                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1399                                 dev->name ? dev->name : "???",
1400                                 dn_type2asc(dn_db->parms.mode),
1401                                 0, 0,
1402                                 dn_db->t3, dn_db->parms.t3,
1403                                 mtu2blksize(dev),
1404                                 dn_db->parms.priority,
1405                                 dn_db->parms.state, dn_db->parms.name,
1406                                 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1407                                 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1408         }
1409         return 0;
1410 }
1411
1412 static const struct seq_operations dn_dev_seq_ops = {
1413         .start  = dn_dev_seq_start,
1414         .next   = dn_dev_seq_next,
1415         .stop   = dn_dev_seq_stop,
1416         .show   = dn_dev_seq_show,
1417 };
1418
1419 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1420 {
1421         return seq_open(file, &dn_dev_seq_ops);
1422 }
1423
1424 static const struct file_operations dn_dev_seq_fops = {
1425         .owner   = THIS_MODULE,
1426         .open    = dn_dev_seq_open,
1427         .read    = seq_read,
1428         .llseek  = seq_lseek,
1429         .release = seq_release,
1430 };
1431
1432 #endif /* CONFIG_PROC_FS */
1433
1434 static int addr[2];
1435 module_param_array(addr, int, NULL, 0444);
1436 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1437
1438 void __init dn_dev_init(void)
1439 {
1440         if (addr[0] > 63 || addr[0] < 0) {
1441                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1442                 return;
1443         }
1444
1445         if (addr[1] > 1023 || addr[1] < 0) {
1446                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1447                 return;
1448         }
1449
1450         decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1451
1452         dn_dev_devices_on();
1453
1454         rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL);
1455         rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL);
1456         rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr);
1457
1458         proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1459
1460 #ifdef CONFIG_SYSCTL
1461         {
1462                 int i;
1463                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1464                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1465         }
1466 #endif /* CONFIG_SYSCTL */
1467 }
1468
1469 void __exit dn_dev_cleanup(void)
1470 {
1471 #ifdef CONFIG_SYSCTL
1472         {
1473                 int i;
1474                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1475                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1476         }
1477 #endif /* CONFIG_SYSCTL */
1478
1479         proc_net_remove(&init_net, "decnet_dev");
1480
1481         dn_dev_devices_off();
1482 }