Pileus Git - ~andy/linux/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                 int err;
 688                 dn_db = dn_dev_create(dev, &err);
 689                 if (!dn_db)
 690                         return err;
 691         }
 692
 693         if ((ifa = dn_dev_alloc_ifa()) == NULL)
 694                 return -ENOBUFS;
 695
 696         if (tb[IFA_ADDRESS] == NULL)
 697                 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
 698
 699         ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
 700         ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
 701         ifa->ifa_flags = ifm->ifa_flags;
 702         ifa->ifa_scope = ifm->ifa_scope;
 703         ifa->ifa_dev = dn_db;
 704
 705         if (tb[IFA_LABEL])
 706                 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
 707         else
 708                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 709
 710         err = dn_dev_insert_ifa(dn_db, ifa);
 711         if (err)
 712                 dn_dev_free_ifa(ifa);
 713
 714         return err;
 715 }
 716
 717 static inline size_t dn_ifaddr_nlmsg_size(void)
 718 {
 719         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
 720                + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
 721                + nla_total_size(2) /* IFA_ADDRESS */
 722                + nla_total_size(2); /* IFA_LOCAL */
 723 }
 724
 725 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
 726                              u32 pid, u32 seq, int event, unsigned int flags)
 727 {
 728         struct ifaddrmsg *ifm;
 729         struct nlmsghdr *nlh;
 730
 731         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
 732         if (nlh == NULL)
 733                 return -EMSGSIZE;
 734
 735         ifm = nlmsg_data(nlh);
 736         ifm->ifa_family = AF_DECnet;
 737         ifm->ifa_prefixlen = 16;
 738         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
 739         ifm->ifa_scope = ifa->ifa_scope;
 740         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
 741
 742         if (ifa->ifa_address)
 743                 NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
 744         if (ifa->ifa_local)
 745                 NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
 746         if (ifa->ifa_label[0])
 747                 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
 748
 749         return nlmsg_end(skb, nlh);
 750
 751 nla_put_failure:
 752         nlmsg_cancel(skb, nlh);
 753         return -EMSGSIZE;
 754 }
 755
 756 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
 757 {
 758         struct sk_buff *skb;
 759         int err = -ENOBUFS;
 760
 761         skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
 762         if (skb == NULL)
 763                 goto errout;
 764
 765         err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
 766         if (err < 0) {
 767                 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
 768                 WARN_ON(err == -EMSGSIZE);
 769                 kfree_skb(skb);
 770                 goto errout;
 771         }
 772         rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
 773         return;
 774 errout:
 775         if (err < 0)
 776                 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
 777 }
 778
 779 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 780 {
 781         struct net *net = sock_net(skb->sk);
 782         int idx, dn_idx = 0, skip_ndevs, skip_naddr;
 783         struct net_device *dev;
 784         struct dn_dev *dn_db;
 785         struct dn_ifaddr *ifa;
 786
 787         if (net != &init_net)
 788                 return 0;
 789
 790         skip_ndevs = cb->args[0];
 791         skip_naddr = cb->args[1];
 792
 793         idx = 0;
 794         for_each_netdev(&init_net, dev) {
 795                 if (idx < skip_ndevs)
 796                         goto cont;
 797                 else if (idx > skip_ndevs) {
 798                         /* Only skip over addresses for first dev dumped
 799                          * in this iteration (idx == skip_ndevs) */
 800                         skip_naddr = 0;
 801                 }
 802
 803                 if ((dn_db = dev->dn_ptr) == NULL)
 804                         goto cont;
 805
 806                 for (ifa = dn_db->ifa_list, dn_idx = 0; ifa;
 807                      ifa = ifa->ifa_next, dn_idx++) {
 808                         if (dn_idx < skip_naddr)
 809                                 continue;
 810
 811                         if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
 812                                               cb->nlh->nlmsg_seq, RTM_NEWADDR,
 813                                               NLM_F_MULTI) < 0)
 814                                 goto done;
 815                 }
 816 cont:
 817                 idx++;
 818         }
 819 done:
 820         cb->args[0] = idx;
 821         cb->args[1] = dn_idx;
 822
 823         return skb->len;
 824 }
 825
 826 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
 827 {
 828         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 829         struct dn_ifaddr *ifa;
 830         int rv = -ENODEV;
 831         if (dn_db == NULL)
 832                 goto out;
 833         ifa = dn_db->ifa_list;
 834         if (ifa != NULL) {
 835                 *addr = ifa->ifa_local;
 836                 rv = 0;
 837         }
 838 out:
 839         return rv;
 840 }
 841
 842 /*
 843  * Find a default address to bind to.
 844  *
 845  * This is one of those areas where the initial VMS concepts don't really
 846  * map onto the Linux concepts, and since we introduced multiple addresses
 847  * per interface we have to cope with slightly odd ways of finding out what
 848  * "our address" really is. Mostly it's not a problem; for this we just guess
 849  * a sensible default. Eventually the routing code will take care of all the
 850  * nasties for us I hope.
 851  */
 852 int dn_dev_bind_default(__le16 *addr)
 853 {
 854         struct net_device *dev;
 855         int rv;
 856         dev = dn_dev_get_default();
 857 last_chance:
 858         if (dev) {
 859                 read_lock(&dev_base_lock);
 860                 rv = dn_dev_get_first(dev, addr);
 861                 read_unlock(&dev_base_lock);
 862                 dev_put(dev);
 863                 if (rv == 0 || dev == init_net.loopback_dev)
 864                         return rv;
 865         }
 866         dev = init_net.loopback_dev;
 867         dev_hold(dev);
 868         goto last_chance;
 869 }
 870
 871 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 872 {
 873         struct endnode_hello_message *msg;
 874         struct sk_buff *skb = NULL;
 875         __le16 *pktlen;
 876         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 877
 878         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
 879                 return;
 880
 881         skb->dev = dev;
 882
 883         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
 884
 885         msg->msgflg  = 0x0D;
 886         memcpy(msg->tiver, dn_eco_version, 3);
 887         dn_dn2eth(msg->id, ifa->ifa_local);
 888         msg->iinfo   = DN_RT_INFO_ENDN;
 889         msg->blksize = cpu_to_le16(mtu2blksize(dev));
 890         msg->area    = 0x00;
 891         memset(msg->seed, 0, 8);
 892         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
 893
 894         if (dn_db->router) {
 895                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 896                 dn_dn2eth(msg->neighbor, dn->addr);
 897         }
 898
 899         msg->timer   = cpu_to_le16((unsigned short)dn_db->parms.t3);
 900         msg->mpd     = 0x00;
 901         msg->datalen = 0x02;
 902         memset(msg->data, 0xAA, 2);
 903
 904         pktlen = (__le16 *)skb_push(skb,2);
 905         *pktlen = cpu_to_le16(skb->len - 2);
 906
 907         skb_reset_network_header(skb);
 908
 909         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
 910 }
 911
 912
 913 #define DRDELAY (5 * HZ)
 914
 915 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 916 {
 917         /* First check time since device went up */
 918         if ((jiffies - dn_db->uptime) < DRDELAY)
 919                 return 0;
 920
 921         /* If there is no router, then yes... */
 922         if (!dn_db->router)
 923                 return 1;
 924
 925         /* otherwise only if we have a higher priority or.. */
 926         if (dn->priority < dn_db->parms.priority)
 927                 return 1;
 928
 929         /* if we have equal priority and a higher node number */
 930         if (dn->priority != dn_db->parms.priority)
 931                 return 0;
 932
 933         if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
 934                 return 1;
 935
 936         return 0;
 937 }
 938
 939 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 940 {
 941         int n;
 942         struct dn_dev *dn_db = dev->dn_ptr;
 943         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 944         struct sk_buff *skb;
 945         size_t size;
 946         unsigned char *ptr;
 947         unsigned char *i1, *i2;
 948         __le16 *pktlen;
 949         char *src;
 950
 951         if (mtu2blksize(dev) < (26 + 7))
 952                 return;
 953
 954         n = mtu2blksize(dev) - 26;
 955         n /= 7;
 956
 957         if (n > 32)
 958                 n = 32;
 959
 960         size = 2 + 26 + 7 * n;
 961
 962         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
 963                 return;
 964
 965         skb->dev = dev;
 966         ptr = skb_put(skb, size);
 967
 968         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
 969         *ptr++ = 2; /* ECO */
 970         *ptr++ = 0;
 971         *ptr++ = 0;
 972         dn_dn2eth(ptr, ifa->ifa_local);
 973         src = ptr;
 974         ptr += ETH_ALEN;
 975         *ptr++ = dn_db->parms.forwarding == 1 ?
 976                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
 977         *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
 978         ptr += 2;
 979         *ptr++ = dn_db->parms.priority; /* Priority */
 980         *ptr++ = 0; /* Area: Reserved */
 981         *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
 982         ptr += 2;
 983         *ptr++ = 0; /* MPD: Reserved */
 984         i1 = ptr++;
 985         memset(ptr, 0, 7); /* Name: Reserved */
 986         ptr += 7;
 987         i2 = ptr++;
 988
 989         n = dn_neigh_elist(dev, ptr, n);
 990
 991         *i2 = 7 * n;
 992         *i1 = 8 + *i2;
 993
 994         skb_trim(skb, (27 + *i2));
 995
 996         pktlen = (__le16 *)skb_push(skb, 2);
 997         *pktlen = cpu_to_le16(skb->len - 2);
 998
 999         skb_reset_network_header(skb);
1000
1001         if (dn_am_i_a_router(dn, dn_db, ifa)) {
1002                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
1003                 if (skb2) {
1004                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
1005                 }
1006         }
1007
1008         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1009 }
1010
1011 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1012 {
1013         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1014
1015         if (dn_db->parms.forwarding == 0)
1016                 dn_send_endnode_hello(dev, ifa);
1017         else
1018                 dn_send_router_hello(dev, ifa);
1019 }
1020
1021 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1022 {
1023         int tdlen = 16;
1024         int size = dev->hard_header_len + 2 + 4 + tdlen;
1025         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1026         int i;
1027         unsigned char *ptr;
1028         char src[ETH_ALEN];
1029
1030         if (skb == NULL)
1031                 return ;
1032
1033         skb->dev = dev;
1034         skb_push(skb, dev->hard_header_len);
1035         ptr = skb_put(skb, 2 + 4 + tdlen);
1036
1037         *ptr++ = DN_RT_PKT_HELO;
1038         *((__le16 *)ptr) = ifa->ifa_local;
1039         ptr += 2;
1040         *ptr++ = tdlen;
1041
1042         for(i = 0; i < tdlen; i++)
1043                 *ptr++ = 0252;
1044
1045         dn_dn2eth(src, ifa->ifa_local);
1046         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1047 }
1048
1049 static int dn_eth_up(struct net_device *dev)
1050 {
1051         struct dn_dev *dn_db = dev->dn_ptr;
1052
1053         if (dn_db->parms.forwarding == 0)
1054                 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1055         else
1056                 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1057
1058         dn_db->use_long = 1;
1059
1060         return 0;
1061 }
1062
1063 static void dn_eth_down(struct net_device *dev)
1064 {
1065         struct dn_dev *dn_db = dev->dn_ptr;
1066
1067         if (dn_db->parms.forwarding == 0)
1068                 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1069         else
1070                 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1071 }
1072
1073 static void dn_dev_set_timer(struct net_device *dev);
1074
1075 static void dn_dev_timer_func(unsigned long arg)
1076 {
1077         struct net_device *dev = (struct net_device *)arg;
1078         struct dn_dev *dn_db = dev->dn_ptr;
1079         struct dn_ifaddr *ifa;
1080
1081         if (dn_db->t3 <= dn_db->parms.t2) {
1082                 if (dn_db->parms.timer3) {
1083                         for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1084                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1085                                         dn_db->parms.timer3(dev, ifa);
1086                         }
1087                 }
1088                 dn_db->t3 = dn_db->parms.t3;
1089         } else {
1090                 dn_db->t3 -= dn_db->parms.t2;
1091         }
1092
1093         dn_dev_set_timer(dev);
1094 }
1095
1096 static void dn_dev_set_timer(struct net_device *dev)
1097 {
1098         struct dn_dev *dn_db = dev->dn_ptr;
1099
1100         if (dn_db->parms.t2 > dn_db->parms.t3)
1101                 dn_db->parms.t2 = dn_db->parms.t3;
1102
1103         dn_db->timer.data = (unsigned long)dev;
1104         dn_db->timer.function = dn_dev_timer_func;
1105         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1106
1107         add_timer(&dn_db->timer);
1108 }
1109
1110 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1111 {
1112         int i;
1113         struct dn_dev_parms *p = dn_dev_list;
1114         struct dn_dev *dn_db;
1115
1116         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1117                 if (p->type == dev->type)
1118                         break;
1119         }
1120
1121         *err = -ENODEV;
1122         if (i == DN_DEV_LIST_SIZE)
1123                 return NULL;
1124
1125         *err = -ENOBUFS;
1126         if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1127                 return NULL;
1128
1129         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1130         smp_wmb();
1131         dev->dn_ptr = dn_db;
1132         dn_db->dev = dev;
1133         init_timer(&dn_db->timer);
1134
1135         dn_db->uptime = jiffies;
1136
1137         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1138         if (!dn_db->neigh_parms) {
1139                 dev->dn_ptr = NULL;
1140                 kfree(dn_db);
1141                 return NULL;
1142         }
1143
1144         if (dn_db->parms.up) {
1145                 if (dn_db->parms.up(dev) < 0) {
1146                         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1147                         dev->dn_ptr = NULL;
1148                         kfree(dn_db);
1149                         return NULL;
1150                 }
1151         }
1152
1153         dn_dev_sysctl_register(dev, &dn_db->parms);
1154
1155         dn_dev_set_timer(dev);
1156
1157         *err = 0;
1158         return dn_db;
1159 }
1160
1161
1162 /*
1163  * This processes a device up event. We only start up
1164  * the loopback device & ethernet devices with correct
1165  * MAC addreses automatically. Others must be started
1166  * specifically.
1167  *
1168  * FIXME: How should we configure the loopback address ? If we could dispense
1169  * with using decnet_address here and for autobind, it will be one less thing
1170  * for users to worry about setting up.
1171  */
1172
1173 void dn_dev_up(struct net_device *dev)
1174 {
1175         struct dn_ifaddr *ifa;
1176         __le16 addr = decnet_address;
1177         int maybe_default = 0;
1178         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1179
1180         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1181                 return;
1182
1183         /*
1184          * Need to ensure that loopback device has a dn_db attached to it
1185          * to allow creation of neighbours against it, even though it might
1186          * not have a local address of its own. Might as well do the same for
1187          * all autoconfigured interfaces.
1188          */
1189         if (dn_db == NULL) {
1190                 int err;
1191                 dn_db = dn_dev_create(dev, &err);
1192                 if (dn_db == NULL)
1193                         return;
1194         }
1195
1196         if (dev->type == ARPHRD_ETHER) {
1197                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1198                         return;
1199                 addr = dn_eth2dn(dev->dev_addr);
1200                 maybe_default = 1;
1201         }
1202
1203         if (addr == 0)
1204                 return;
1205
1206         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1207                 return;
1208
1209         ifa->ifa_local = ifa->ifa_address = addr;
1210         ifa->ifa_flags = 0;
1211         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1212         strcpy(ifa->ifa_label, dev->name);
1213
1214         dn_dev_set_ifa(dev, ifa);
1215
1216         /*
1217          * Automagically set the default device to the first automatically
1218          * configured ethernet card in the system.
1219          */
1220         if (maybe_default) {
1221                 dev_hold(dev);
1222                 if (dn_dev_set_default(dev, 0))
1223                         dev_put(dev);
1224         }
1225 }
1226
1227 static void dn_dev_delete(struct net_device *dev)
1228 {
1229         struct dn_dev *dn_db = dev->dn_ptr;
1230
1231         if (dn_db == NULL)
1232                 return;
1233
1234         del_timer_sync(&dn_db->timer);
1235         dn_dev_sysctl_unregister(&dn_db->parms);
1236         dn_dev_check_default(dev);
1237         neigh_ifdown(&dn_neigh_table, dev);
1238
1239         if (dn_db->parms.down)
1240                 dn_db->parms.down(dev);
1241
1242         dev->dn_ptr = NULL;
1243
1244         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1245         neigh_ifdown(&dn_neigh_table, dev);
1246
1247         if (dn_db->router)
1248                 neigh_release(dn_db->router);
1249         if (dn_db->peer)
1250                 neigh_release(dn_db->peer);
1251
1252         kfree(dn_db);
1253 }
1254
1255 void dn_dev_down(struct net_device *dev)
1256 {
1257         struct dn_dev *dn_db = dev->dn_ptr;
1258         struct dn_ifaddr *ifa;
1259
1260         if (dn_db == NULL)
1261                 return;
1262
1263         while((ifa = dn_db->ifa_list) != NULL) {
1264                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1265                 dn_dev_free_ifa(ifa);
1266         }
1267
1268         dn_dev_delete(dev);
1269 }
1270
1271 void dn_dev_init_pkt(struct sk_buff *skb)
1272 {
1273         return;
1274 }
1275
1276 void dn_dev_veri_pkt(struct sk_buff *skb)
1277 {
1278         return;
1279 }
1280
1281 void dn_dev_hello(struct sk_buff *skb)
1282 {
1283         return;
1284 }
1285
1286 void dn_dev_devices_off(void)
1287 {
1288         struct net_device *dev;
1289
1290         rtnl_lock();
1291         for_each_netdev(&init_net, dev)
1292                 dn_dev_down(dev);
1293         rtnl_unlock();
1294
1295 }
1296
1297 void dn_dev_devices_on(void)
1298 {
1299         struct net_device *dev;
1300
1301         rtnl_lock();
1302         for_each_netdev(&init_net, dev) {
1303                 if (dev->flags & IFF_UP)
1304                         dn_dev_up(dev);
1305         }
1306         rtnl_unlock();
1307 }
1308
1309 int register_dnaddr_notifier(struct notifier_block *nb)
1310 {
1311         return blocking_notifier_chain_register(&dnaddr_chain, nb);
1312 }
1313
1314 int unregister_dnaddr_notifier(struct notifier_block *nb)
1315 {
1316         return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1317 }
1318
1319 #ifdef CONFIG_PROC_FS
1320 static inline int is_dn_dev(struct net_device *dev)
1321 {
1322         return dev->dn_ptr != NULL;
1323 }
1324
1325 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
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 {
1369         read_unlock(&dev_base_lock);
1370 }
1371
1372 static char *dn_type2asc(char type)
1373 {
1374         switch(type) {
1375                 case DN_DEV_BCAST:
1376                         return "B";
1377                 case DN_DEV_UCAST:
1378                         return "U";
1379                 case DN_DEV_MPOINT:
1380                         return "M";
1381         }
1382
1383         return "?";
1384 }
1385
1386 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1387 {
1388         if (v == SEQ_START_TOKEN)
1389                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1390         else {
1391                 struct net_device *dev = v;
1392                 char peer_buf[DN_ASCBUF_LEN];
1393                 char router_buf[DN_ASCBUF_LEN];
1394                 struct dn_dev *dn_db = dev->dn_ptr;
1395
1396                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1397                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1398                                 dev->name ? dev->name : "???",
1399                                 dn_type2asc(dn_db->parms.mode),
1400                                 0, 0,
1401                                 dn_db->t3, dn_db->parms.t3,
1402                                 mtu2blksize(dev),
1403                                 dn_db->parms.priority,
1404                                 dn_db->parms.state, dn_db->parms.name,
1405                                 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1406                                 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1407         }
1408         return 0;
1409 }
1410
1411 static const struct seq_operations dn_dev_seq_ops = {
1412         .start  = dn_dev_seq_start,
1413         .next   = dn_dev_seq_next,
1414         .stop   = dn_dev_seq_stop,
1415         .show   = dn_dev_seq_show,
1416 };
1417
1418 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1419 {
1420         return seq_open(file, &dn_dev_seq_ops);
1421 }
1422
1423 static const struct file_operations dn_dev_seq_fops = {
1424         .owner   = THIS_MODULE,
1425         .open    = dn_dev_seq_open,
1426         .read    = seq_read,
1427         .llseek  = seq_lseek,
1428         .release = seq_release,
1429 };
1430
1431 #endif /* CONFIG_PROC_FS */
1432
1433 static int addr[2];
1434 module_param_array(addr, int, NULL, 0444);
1435 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1436
1437 void __init dn_dev_init(void)
1438 {
1439         if (addr[0] > 63 || addr[0] < 0) {
1440                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1441                 return;
1442         }
1443
1444         if (addr[1] > 1023 || addr[1] < 0) {
1445                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1446                 return;
1447         }
1448
1449         decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1450
1451         dn_dev_devices_on();
1452
1453         rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL);
1454         rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL);
1455         rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr);
1456
1457         proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1458
1459 #ifdef CONFIG_SYSCTL
1460         {
1461                 int i;
1462                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1463                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1464         }
1465 #endif /* CONFIG_SYSCTL */
1466 }
1467
1468 void __exit dn_dev_cleanup(void)
1469 {
1470 #ifdef CONFIG_SYSCTL
1471         {
1472                 int i;
1473                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1474                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1475         }
1476 #endif /* CONFIG_SYSCTL */
1477
1478         proc_net_remove(&init_net, "decnet_dev");
1479
1480         dn_dev_devices_off();
1481 }