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_arp.h>
  38 #include <linux/if_ether.h>
  39 #include <linux/skbuff.h>
  40 #include <linux/rtnetlink.h>
  41 #include <linux/sysctl.h>
  42 #include <linux/notifier.h>
  43 #include <asm/uaccess.h>
  44 #include <asm/system.h>
  45 #include <net/neighbour.h>
  46 #include <net/dst.h>
  47 #include <net/flow.h>
  48 #include <net/dn.h>
  49 #include <net/dn_dev.h>
  50 #include <net/dn_route.h>
  51 #include <net/dn_neigh.h>
  52 #include <net/dn_fib.h>
  53
  54 #define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
  55
  56 static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
  57 static char dn_rt_all_rt_mcast[ETH_ALEN]  = {0xAB,0x00,0x00,0x03,0x00,0x00};
  58 static char dn_hiord[ETH_ALEN]            = {0xAA,0x00,0x04,0x00,0x00,0x00};
  59 static unsigned char dn_eco_version[3]    = {0x02,0x00,0x00};
  60
  61 extern struct neigh_table dn_neigh_table;
  62
  63 /*
  64  * decnet_address is kept in network order.
  65  */
  66 __le16 decnet_address = 0;
  67
  68 static DEFINE_RWLOCK(dndev_lock);
  69 static struct net_device *decnet_default_device;
  70 static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
  71
  72 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
  73 static void dn_dev_delete(struct net_device *dev);
  74 static void rtmsg_ifa(int event, struct dn_ifaddr *ifa);
  75
  76 static int dn_eth_up(struct net_device *);
  77 static void dn_eth_down(struct net_device *);
  78 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  79 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  80
  81 static struct dn_dev_parms dn_dev_list[] =  {
  82 {
  83         .type =         ARPHRD_ETHER, /* Ethernet */
  84         .mode =         DN_DEV_BCAST,
  85         .state =        DN_DEV_S_RU,
  86         .t2 =           1,
  87         .t3 =           10,
  88         .name =         "ethernet",
  89         .ctl_name =     NET_DECNET_CONF_ETHER,
  90         .up =           dn_eth_up,
  91         .down =         dn_eth_down,
  92         .timer3 =       dn_send_brd_hello,
  93 },
  94 {
  95         .type =         ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
  96         .mode =         DN_DEV_BCAST,
  97         .state =        DN_DEV_S_RU,
  98         .t2 =           1,
  99         .t3 =           10,
 100         .name =         "ipgre",
 101         .ctl_name =     NET_DECNET_CONF_GRE,
 102         .timer3 =       dn_send_brd_hello,
 103 },
 104 #if 0
 105 {
 106         .type =         ARPHRD_X25, /* Bog standard X.25 */
 107         .mode =         DN_DEV_UCAST,
 108         .state =        DN_DEV_S_DS,
 109         .t2 =           1,
 110         .t3 =           120,
 111         .name =         "x25",
 112         .ctl_name =     NET_DECNET_CONF_X25,
 113         .timer3 =       dn_send_ptp_hello,
 114 },
 115 #endif
 116 #if 0
 117 {
 118         .type =         ARPHRD_PPP, /* DECnet over PPP */
 119         .mode =         DN_DEV_BCAST,
 120         .state =        DN_DEV_S_RU,
 121         .t2 =           1,
 122         .t3 =           10,
 123         .name =         "ppp",
 124         .ctl_name =     NET_DECNET_CONF_PPP,
 125         .timer3 =       dn_send_brd_hello,
 126 },
 127 #endif
 128 {
 129         .type =         ARPHRD_DDCMP, /* DECnet over DDCMP */
 130         .mode =         DN_DEV_UCAST,
 131         .state =        DN_DEV_S_DS,
 132         .t2 =           1,
 133         .t3 =           120,
 134         .name =         "ddcmp",
 135         .ctl_name =     NET_DECNET_CONF_DDCMP,
 136         .timer3 =       dn_send_ptp_hello,
 137 },
 138 {
 139         .type =         ARPHRD_LOOPBACK, /* Loopback interface - always last */
 140         .mode =         DN_DEV_BCAST,
 141         .state =        DN_DEV_S_RU,
 142         .t2 =           1,
 143         .t3 =           10,
 144         .name =         "loopback",
 145         .ctl_name =     NET_DECNET_CONF_LOOPBACK,
 146         .timer3 =       dn_send_brd_hello,
 147 }
 148 };
 149
 150 #define DN_DEV_LIST_SIZE (sizeof(dn_dev_list)/sizeof(struct dn_dev_parms))
 151
 152 #define DN_DEV_PARMS_OFFSET(x) ((int) ((char *) &((struct dn_dev_parms *)0)->x))
 153
 154 #ifdef CONFIG_SYSCTL
 155
 156 static int min_t2[] = { 1 };
 157 static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
 158 static int min_t3[] = { 1 };
 159 static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
 160
 161 static int min_priority[1];
 162 static int max_priority[] = { 127 }; /* From DECnet spec */
 163
 164 static int dn_forwarding_proc(ctl_table *, int, struct file *,
 165                         void __user *, size_t *, loff_t *);
 166 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
 167                         void __user *oldval, size_t __user *oldlenp,
 168                         void __user *newval, size_t newlen,
 169                         void **context);
 170
 171 static struct dn_dev_sysctl_table {
 172         struct ctl_table_header *sysctl_header;
 173         ctl_table dn_dev_vars[5];
 174         ctl_table dn_dev_dev[2];
 175         ctl_table dn_dev_conf_dir[2];
 176         ctl_table dn_dev_proto_dir[2];
 177         ctl_table dn_dev_root_dir[2];
 178 } dn_dev_sysctl = {
 179         NULL,
 180         {
 181         {
 182                 .ctl_name = NET_DECNET_CONF_DEV_FORWARDING,
 183                 .procname = "forwarding",
 184                 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
 185                 .maxlen = sizeof(int),
 186                 .mode = 0644,
 187                 .proc_handler = dn_forwarding_proc,
 188                 .strategy = dn_forwarding_sysctl,
 189         },
 190         {
 191                 .ctl_name = NET_DECNET_CONF_DEV_PRIORITY,
 192                 .procname = "priority",
 193                 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
 194                 .maxlen = sizeof(int),
 195                 .mode = 0644,
 196                 .proc_handler = proc_dointvec_minmax,
 197                 .strategy = sysctl_intvec,
 198                 .extra1 = &min_priority,
 199                 .extra2 = &max_priority
 200         },
 201         {
 202                 .ctl_name = NET_DECNET_CONF_DEV_T2,
 203                 .procname = "t2",
 204                 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
 205                 .maxlen = sizeof(int),
 206                 .mode = 0644,
 207                 .proc_handler = proc_dointvec_minmax,
 208                 .strategy = sysctl_intvec,
 209                 .extra1 = &min_t2,
 210                 .extra2 = &max_t2
 211         },
 212         {
 213                 .ctl_name = NET_DECNET_CONF_DEV_T3,
 214                 .procname = "t3",
 215                 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
 216                 .maxlen = sizeof(int),
 217                 .mode = 0644,
 218                 .proc_handler = proc_dointvec_minmax,
 219                 .strategy = sysctl_intvec,
 220                 .extra1 = &min_t3,
 221                 .extra2 = &max_t3
 222         },
 223         {0}
 224         },
 225         {{
 226                 .ctl_name = 0,
 227                 .procname = "",
 228                 .mode = 0555,
 229                 .child = dn_dev_sysctl.dn_dev_vars
 230         }, {0}},
 231         {{
 232                 .ctl_name = NET_DECNET_CONF,
 233                 .procname = "conf",
 234                 .mode = 0555,
 235                 .child = dn_dev_sysctl.dn_dev_dev
 236         }, {0}},
 237         {{
 238                 .ctl_name = NET_DECNET,
 239                 .procname = "decnet",
 240                 .mode = 0555,
 241                 .child = dn_dev_sysctl.dn_dev_conf_dir
 242         }, {0}},
 243         {{
 244                 .ctl_name = CTL_NET,
 245                 .procname = "net",
 246                 .mode = 0555,
 247                 .child = dn_dev_sysctl.dn_dev_proto_dir
 248         }, {0}}
 249 };
 250
 251 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 252 {
 253         struct dn_dev_sysctl_table *t;
 254         int i;
 255
 256         t = kmalloc(sizeof(*t), GFP_KERNEL);
 257         if (t == NULL)
 258                 return;
 259
 260         memcpy(t, &dn_dev_sysctl, sizeof(*t));
 261
 262         for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
 263                 long offset = (long)t->dn_dev_vars[i].data;
 264                 t->dn_dev_vars[i].data = ((char *)parms) + offset;
 265                 t->dn_dev_vars[i].de = NULL;
 266         }
 267
 268         if (dev) {
 269                 t->dn_dev_dev[0].procname = dev->name;
 270                 t->dn_dev_dev[0].ctl_name = dev->ifindex;
 271         } else {
 272                 t->dn_dev_dev[0].procname = parms->name;
 273                 t->dn_dev_dev[0].ctl_name = parms->ctl_name;
 274         }
 275
 276         t->dn_dev_dev[0].child = t->dn_dev_vars;
 277         t->dn_dev_dev[0].de = NULL;
 278         t->dn_dev_conf_dir[0].child = t->dn_dev_dev;
 279         t->dn_dev_conf_dir[0].de = NULL;
 280         t->dn_dev_proto_dir[0].child = t->dn_dev_conf_dir;
 281         t->dn_dev_proto_dir[0].de = NULL;
 282         t->dn_dev_root_dir[0].child = t->dn_dev_proto_dir;
 283         t->dn_dev_root_dir[0].de = NULL;
 284         t->dn_dev_vars[0].extra1 = (void *)dev;
 285
 286         t->sysctl_header = register_sysctl_table(t->dn_dev_root_dir, 0);
 287         if (t->sysctl_header == NULL)
 288                 kfree(t);
 289         else
 290                 parms->sysctl = t;
 291 }
 292
 293 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 294 {
 295         if (parms->sysctl) {
 296                 struct dn_dev_sysctl_table *t = parms->sysctl;
 297                 parms->sysctl = NULL;
 298                 unregister_sysctl_table(t->sysctl_header);
 299                 kfree(t);
 300         }
 301 }
 302
 303 static int dn_forwarding_proc(ctl_table *table, int write,
 304                                 struct file *filep,
 305                                 void __user *buffer,
 306                                 size_t *lenp, loff_t *ppos)
 307 {
 308 #ifdef CONFIG_DECNET_ROUTER
 309         struct net_device *dev = table->extra1;
 310         struct dn_dev *dn_db;
 311         int err;
 312         int tmp, old;
 313
 314         if (table->extra1 == NULL)
 315                 return -EINVAL;
 316
 317         dn_db = dev->dn_ptr;
 318         old = dn_db->parms.forwarding;
 319
 320         err = proc_dointvec(table, write, filep, buffer, lenp, ppos);
 321
 322         if ((err >= 0) && write) {
 323                 if (dn_db->parms.forwarding < 0)
 324                         dn_db->parms.forwarding = 0;
 325                 if (dn_db->parms.forwarding > 2)
 326                         dn_db->parms.forwarding = 2;
 327                 /*
 328                  * What an ugly hack this is... its works, just. It
 329                  * would be nice if sysctl/proc were just that little
 330                  * bit more flexible so I don't have to write a special
 331                  * routine, or suffer hacks like this - SJW
 332                  */
 333                 tmp = dn_db->parms.forwarding;
 334                 dn_db->parms.forwarding = old;
 335                 if (dn_db->parms.down)
 336                         dn_db->parms.down(dev);
 337                 dn_db->parms.forwarding = tmp;
 338                 if (dn_db->parms.up)
 339                         dn_db->parms.up(dev);
 340         }
 341
 342         return err;
 343 #else
 344         return -EINVAL;
 345 #endif
 346 }
 347
 348 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
 349                         void __user *oldval, size_t __user *oldlenp,
 350                         void __user *newval, size_t newlen,
 351                         void **context)
 352 {
 353 #ifdef CONFIG_DECNET_ROUTER
 354         struct net_device *dev = table->extra1;
 355         struct dn_dev *dn_db;
 356         int value;
 357
 358         if (table->extra1 == NULL)
 359                 return -EINVAL;
 360
 361         dn_db = dev->dn_ptr;
 362
 363         if (newval && newlen) {
 364                 if (newlen != sizeof(int))
 365                         return -EINVAL;
 366
 367                 if (get_user(value, (int __user *)newval))
 368                         return -EFAULT;
 369                 if (value < 0)
 370                         return -EINVAL;
 371                 if (value > 2)
 372                         return -EINVAL;
 373
 374                 if (dn_db->parms.down)
 375                         dn_db->parms.down(dev);
 376                 dn_db->parms.forwarding = value;
 377                 if (dn_db->parms.up)
 378                         dn_db->parms.up(dev);
 379         }
 380
 381         return 0;
 382 #else
 383         return -EINVAL;
 384 #endif
 385 }
 386
 387 #else /* CONFIG_SYSCTL */
 388 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 389 {
 390 }
 391 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 392 {
 393 }
 394
 395 #endif /* CONFIG_SYSCTL */
 396
 397 static inline __u16 mtu2blksize(struct net_device *dev)
 398 {
 399         u32 blksize = dev->mtu;
 400         if (blksize > 0xffff)
 401                 blksize = 0xffff;
 402
 403         if (dev->type == ARPHRD_ETHER ||
 404             dev->type == ARPHRD_PPP ||
 405             dev->type == ARPHRD_IPGRE ||
 406             dev->type == ARPHRD_LOOPBACK)
 407                 blksize -= 2;
 408
 409         return (__u16)blksize;
 410 }
 411
 412 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
 413 {
 414         struct dn_ifaddr *ifa;
 415
 416         ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
 417
 418         return ifa;
 419 }
 420
 421 static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
 422 {
 423         kfree(ifa);
 424 }
 425
 426 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
 427 {
 428         struct dn_ifaddr *ifa1 = *ifap;
 429         unsigned char mac_addr[6];
 430         struct net_device *dev = dn_db->dev;
 431
 432         ASSERT_RTNL();
 433
 434         *ifap = ifa1->ifa_next;
 435
 436         if (dn_db->dev->type == ARPHRD_ETHER) {
 437                 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
 438                         dn_dn2eth(mac_addr, ifa1->ifa_local);
 439                         dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
 440                 }
 441         }
 442
 443         rtmsg_ifa(RTM_DELADDR, ifa1);
 444         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
 445         if (destroy) {
 446                 dn_dev_free_ifa(ifa1);
 447
 448                 if (dn_db->ifa_list == NULL)
 449                         dn_dev_delete(dn_db->dev);
 450         }
 451 }
 452
 453 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 454 {
 455         struct net_device *dev = dn_db->dev;
 456         struct dn_ifaddr *ifa1;
 457         unsigned char mac_addr[6];
 458
 459         ASSERT_RTNL();
 460
 461         /* Check for duplicates */
 462         for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
 463                 if (ifa1->ifa_local == ifa->ifa_local)
 464                         return -EEXIST;
 465         }
 466
 467         if (dev->type == ARPHRD_ETHER) {
 468                 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
 469                         dn_dn2eth(mac_addr, ifa->ifa_local);
 470                         dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
 471                         dev_mc_upload(dev);
 472                 }
 473         }
 474
 475         ifa->ifa_next = dn_db->ifa_list;
 476         dn_db->ifa_list = ifa;
 477
 478         rtmsg_ifa(RTM_NEWADDR, ifa);
 479         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
 480
 481         return 0;
 482 }
 483
 484 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
 485 {
 486         struct dn_dev *dn_db = dev->dn_ptr;
 487         int rv;
 488
 489         if (dn_db == NULL) {
 490                 int err;
 491                 dn_db = dn_dev_create(dev, &err);
 492                 if (dn_db == NULL)
 493                         return err;
 494         }
 495
 496         ifa->ifa_dev = dn_db;
 497
 498         if (dev->flags & IFF_LOOPBACK)
 499                 ifa->ifa_scope = RT_SCOPE_HOST;
 500
 501         rv = dn_dev_insert_ifa(dn_db, ifa);
 502         if (rv)
 503                 dn_dev_free_ifa(ifa);
 504         return rv;
 505 }
 506
 507
 508 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
 509 {
 510         char buffer[DN_IFREQ_SIZE];
 511         struct ifreq *ifr = (struct ifreq *)buffer;
 512         struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
 513         struct dn_dev *dn_db;
 514         struct net_device *dev;
 515         struct dn_ifaddr *ifa = NULL, **ifap = NULL;
 516         int ret = 0;
 517
 518         if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
 519                 return -EFAULT;
 520         ifr->ifr_name[IFNAMSIZ-1] = 0;
 521
 522 #ifdef CONFIG_KMOD
 523         dev_load(ifr->ifr_name);
 524 #endif
 525
 526         switch(cmd) {
 527                 case SIOCGIFADDR:
 528                         break;
 529                 case SIOCSIFADDR:
 530                         if (!capable(CAP_NET_ADMIN))
 531                                 return -EACCES;
 532                         if (sdn->sdn_family != AF_DECnet)
 533                                 return -EINVAL;
 534                         break;
 535                 default:
 536                         return -EINVAL;
 537         }
 538
 539         rtnl_lock();
 540
 541         if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL) {
 542                 ret = -ENODEV;
 543                 goto done;
 544         }
 545
 546         if ((dn_db = dev->dn_ptr) != NULL) {
 547                 for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
 548                         if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
 549                                 break;
 550         }
 551
 552         if (ifa == NULL && cmd != SIOCSIFADDR) {
 553                 ret = -EADDRNOTAVAIL;
 554                 goto done;
 555         }
 556
 557         switch(cmd) {
 558                 case SIOCGIFADDR:
 559                         *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
 560                         goto rarok;
 561
 562                 case SIOCSIFADDR:
 563                         if (!ifa) {
 564                                 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
 565                                         ret = -ENOBUFS;
 566                                         break;
 567                                 }
 568                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 569                         } else {
 570                                 if (ifa->ifa_local == dn_saddr2dn(sdn))
 571                                         break;
 572                                 dn_dev_del_ifa(dn_db, ifap, 0);
 573                         }
 574
 575                         ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
 576
 577                         ret = dn_dev_set_ifa(dev, ifa);
 578         }
 579 done:
 580         rtnl_unlock();
 581
 582         return ret;
 583 rarok:
 584         if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
 585                 ret = -EFAULT;
 586         goto done;
 587 }
 588
 589 struct net_device *dn_dev_get_default(void)
 590 {
 591         struct net_device *dev;
 592         read_lock(&dndev_lock);
 593         dev = decnet_default_device;
 594         if (dev) {
 595                 if (dev->dn_ptr)
 596                         dev_hold(dev);
 597                 else
 598                         dev = NULL;
 599         }
 600         read_unlock(&dndev_lock);
 601         return dev;
 602 }
 603
 604 int dn_dev_set_default(struct net_device *dev, int force)
 605 {
 606         struct net_device *old = NULL;
 607         int rv = -EBUSY;
 608         if (!dev->dn_ptr)
 609                 return -ENODEV;
 610         write_lock(&dndev_lock);
 611         if (force || decnet_default_device == NULL) {
 612                 old = decnet_default_device;
 613                 decnet_default_device = dev;
 614                 rv = 0;
 615         }
 616         write_unlock(&dndev_lock);
 617         if (old)
 618                 dev_put(old);
 619         return rv;
 620 }
 621
 622 static void dn_dev_check_default(struct net_device *dev)
 623 {
 624         write_lock(&dndev_lock);
 625         if (dev == decnet_default_device) {
 626                 decnet_default_device = NULL;
 627         } else {
 628                 dev = NULL;
 629         }
 630         write_unlock(&dndev_lock);
 631         if (dev)
 632                 dev_put(dev);
 633 }
 634
 635 static struct dn_dev *dn_dev_by_index(int ifindex)
 636 {
 637         struct net_device *dev;
 638         struct dn_dev *dn_dev = NULL;
 639         dev = dev_get_by_index(ifindex);
 640         if (dev) {
 641                 dn_dev = dev->dn_ptr;
 642                 dev_put(dev);
 643         }
 644
 645         return dn_dev;
 646 }
 647
 648 static int dn_dev_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 649 {
 650         struct rtattr **rta = arg;
 651         struct dn_dev *dn_db;
 652         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
 653         struct dn_ifaddr *ifa, **ifap;
 654
 655         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
 656                 return -EADDRNOTAVAIL;
 657
 658         for(ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next) {
 659                 void *tmp = rta[IFA_LOCAL-1];
 660                 if ((tmp && memcmp(RTA_DATA(tmp), &ifa->ifa_local, 2)) ||
 661                     (rta[IFA_LABEL-1] && rtattr_strcmp(rta[IFA_LABEL-1], ifa->ifa_label)))
 662                         continue;
 663
 664                 dn_dev_del_ifa(dn_db, ifap, 1);
 665                 return 0;
 666         }
 667
 668         return -EADDRNOTAVAIL;
 669 }
 670
 671 static int dn_dev_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 672 {
 673         struct rtattr **rta = arg;
 674         struct net_device *dev;
 675         struct dn_dev *dn_db;
 676         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
 677         struct dn_ifaddr *ifa;
 678         int rv;
 679
 680         if (rta[IFA_LOCAL-1] == NULL)
 681                 return -EINVAL;
 682
 683         if ((dev = __dev_get_by_index(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 (!rta[IFA_ADDRESS - 1])
 697                 rta[IFA_ADDRESS - 1] = rta[IFA_LOCAL - 1];
 698         memcpy(&ifa->ifa_local, RTA_DATA(rta[IFA_LOCAL-1]), 2);
 699         memcpy(&ifa->ifa_address, RTA_DATA(rta[IFA_ADDRESS-1]), 2);
 700         ifa->ifa_flags = ifm->ifa_flags;
 701         ifa->ifa_scope = ifm->ifa_scope;
 702         ifa->ifa_dev = dn_db;
 703         if (rta[IFA_LABEL-1])
 704                 rtattr_strlcpy(ifa->ifa_label, rta[IFA_LABEL-1], IFNAMSIZ);
 705         else
 706                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 707
 708         rv = dn_dev_insert_ifa(dn_db, ifa);
 709         if (rv)
 710                 dn_dev_free_ifa(ifa);
 711         return rv;
 712 }
 713
 714 static int dn_dev_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
 715                                 u32 pid, u32 seq, int event, unsigned int flags)
 716 {
 717         struct ifaddrmsg *ifm;
 718         struct nlmsghdr *nlh;
 719         unsigned char *b = skb->tail;
 720
 721         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
 722         ifm = NLMSG_DATA(nlh);
 723
 724         ifm->ifa_family = AF_DECnet;
 725         ifm->ifa_prefixlen = 16;
 726         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
 727         ifm->ifa_scope = ifa->ifa_scope;
 728         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
 729         if (ifa->ifa_address)
 730                 RTA_PUT(skb, IFA_ADDRESS, 2, &ifa->ifa_address);
 731         if (ifa->ifa_local)
 732                 RTA_PUT(skb, IFA_LOCAL, 2, &ifa->ifa_local);
 733         if (ifa->ifa_label[0])
 734                 RTA_PUT(skb, IFA_LABEL, IFNAMSIZ, &ifa->ifa_label);
 735         nlh->nlmsg_len = skb->tail - b;
 736         return skb->len;
 737
 738 nlmsg_failure:
 739 rtattr_failure:
 740         skb_trim(skb, b - skb->data);
 741         return -1;
 742 }
 743
 744 static void rtmsg_ifa(int event, struct dn_ifaddr *ifa)
 745 {
 746         struct sk_buff *skb;
 747         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
 748
 749         skb = alloc_skb(size, GFP_KERNEL);
 750         if (!skb) {
 751                 netlink_set_err(rtnl, 0, RTNLGRP_DECnet_IFADDR, ENOBUFS);
 752                 return;
 753         }
 754         if (dn_dev_fill_ifaddr(skb, ifa, 0, 0, event, 0) < 0) {
 755                 kfree_skb(skb);
 756                 netlink_set_err(rtnl, 0, RTNLGRP_DECnet_IFADDR, EINVAL);
 757                 return;
 758         }
 759         NETLINK_CB(skb).dst_group = RTNLGRP_DECnet_IFADDR;
 760         netlink_broadcast(rtnl, skb, 0, RTNLGRP_DECnet_IFADDR, GFP_KERNEL);
 761 }
 762
 763 static int dn_dev_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 764 {
 765         int idx, dn_idx;
 766         int s_idx, s_dn_idx;
 767         struct net_device *dev;
 768         struct dn_dev *dn_db;
 769         struct dn_ifaddr *ifa;
 770
 771         s_idx = cb->args[0];
 772         s_dn_idx = dn_idx = cb->args[1];
 773         read_lock(&dev_base_lock);
 774         for(dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
 775                 if (idx < s_idx)
 776                         continue;
 777                 if (idx > s_idx)
 778                         s_dn_idx = 0;
 779                 if ((dn_db = dev->dn_ptr) == NULL)
 780                         continue;
 781
 782                 for(ifa = dn_db->ifa_list, dn_idx = 0; ifa; ifa = ifa->ifa_next, dn_idx++) {
 783                         if (dn_idx < s_dn_idx)
 784                                 continue;
 785
 786                         if (dn_dev_fill_ifaddr(skb, ifa,
 787                                                NETLINK_CB(cb->skb).pid,
 788                                                cb->nlh->nlmsg_seq,
 789                                                RTM_NEWADDR,
 790                                                NLM_F_MULTI) <= 0)
 791                                 goto done;
 792                 }
 793         }
 794 done:
 795         read_unlock(&dev_base_lock);
 796         cb->args[0] = idx;
 797         cb->args[1] = dn_idx;
 798
 799         return skb->len;
 800 }
 801
 802 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
 803 {
 804         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 805         struct dn_ifaddr *ifa;
 806         int rv = -ENODEV;
 807         if (dn_db == NULL)
 808                 goto out;
 809         ifa = dn_db->ifa_list;
 810         if (ifa != NULL) {
 811                 *addr = ifa->ifa_local;
 812                 rv = 0;
 813         }
 814 out:
 815         return rv;
 816 }
 817
 818 /*
 819  * Find a default address to bind to.
 820  *
 821  * This is one of those areas where the initial VMS concepts don't really
 822  * map onto the Linux concepts, and since we introduced multiple addresses
 823  * per interface we have to cope with slightly odd ways of finding out what
 824  * "our address" really is. Mostly it's not a problem; for this we just guess
 825  * a sensible default. Eventually the routing code will take care of all the
 826  * nasties for us I hope.
 827  */
 828 int dn_dev_bind_default(__le16 *addr)
 829 {
 830         struct net_device *dev;
 831         int rv;
 832         dev = dn_dev_get_default();
 833 last_chance:
 834         if (dev) {
 835                 read_lock(&dev_base_lock);
 836                 rv = dn_dev_get_first(dev, addr);
 837                 read_unlock(&dev_base_lock);
 838                 dev_put(dev);
 839                 if (rv == 0 || dev == &loopback_dev)
 840                         return rv;
 841         }
 842         dev = &loopback_dev;
 843         dev_hold(dev);
 844         goto last_chance;
 845 }
 846
 847 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 848 {
 849         struct endnode_hello_message *msg;
 850         struct sk_buff *skb = NULL;
 851         __le16 *pktlen;
 852         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 853
 854         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
 855                 return;
 856
 857         skb->dev = dev;
 858
 859         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
 860
 861         msg->msgflg  = 0x0D;
 862         memcpy(msg->tiver, dn_eco_version, 3);
 863         dn_dn2eth(msg->id, ifa->ifa_local);
 864         msg->iinfo   = DN_RT_INFO_ENDN;
 865         msg->blksize = dn_htons(mtu2blksize(dev));
 866         msg->area    = 0x00;
 867         memset(msg->seed, 0, 8);
 868         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
 869
 870         if (dn_db->router) {
 871                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 872                 dn_dn2eth(msg->neighbor, dn->addr);
 873         }
 874
 875         msg->timer   = dn_htons((unsigned short)dn_db->parms.t3);
 876         msg->mpd     = 0x00;
 877         msg->datalen = 0x02;
 878         memset(msg->data, 0xAA, 2);
 879
 880         pktlen = (__le16 *)skb_push(skb,2);
 881         *pktlen = dn_htons(skb->len - 2);
 882
 883         skb->nh.raw = skb->data;
 884
 885         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
 886 }
 887
 888
 889 #define DRDELAY (5 * HZ)
 890
 891 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 892 {
 893         /* First check time since device went up */
 894         if ((jiffies - dn_db->uptime) < DRDELAY)
 895                 return 0;
 896
 897         /* If there is no router, then yes... */
 898         if (!dn_db->router)
 899                 return 1;
 900
 901         /* otherwise only if we have a higher priority or.. */
 902         if (dn->priority < dn_db->parms.priority)
 903                 return 1;
 904
 905         /* if we have equal priority and a higher node number */
 906         if (dn->priority != dn_db->parms.priority)
 907                 return 0;
 908
 909         if (dn_ntohs(dn->addr) < dn_ntohs(ifa->ifa_local))
 910                 return 1;
 911
 912         return 0;
 913 }
 914
 915 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 916 {
 917         int n;
 918         struct dn_dev *dn_db = dev->dn_ptr;
 919         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 920         struct sk_buff *skb;
 921         size_t size;
 922         unsigned char *ptr;
 923         unsigned char *i1, *i2;
 924         __le16 *pktlen;
 925         char *src;
 926
 927         if (mtu2blksize(dev) < (26 + 7))
 928                 return;
 929
 930         n = mtu2blksize(dev) - 26;
 931         n /= 7;
 932
 933         if (n > 32)
 934                 n = 32;
 935
 936         size = 2 + 26 + 7 * n;
 937
 938         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
 939                 return;
 940
 941         skb->dev = dev;
 942         ptr = skb_put(skb, size);
 943
 944         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
 945         *ptr++ = 2; /* ECO */
 946         *ptr++ = 0;
 947         *ptr++ = 0;
 948         dn_dn2eth(ptr, ifa->ifa_local);
 949         src = ptr;
 950         ptr += ETH_ALEN;
 951         *ptr++ = dn_db->parms.forwarding == 1 ?
 952                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
 953         *((__le16 *)ptr) = dn_htons(mtu2blksize(dev));
 954         ptr += 2;
 955         *ptr++ = dn_db->parms.priority; /* Priority */
 956         *ptr++ = 0; /* Area: Reserved */
 957         *((__le16 *)ptr) = dn_htons((unsigned short)dn_db->parms.t3);
 958         ptr += 2;
 959         *ptr++ = 0; /* MPD: Reserved */
 960         i1 = ptr++;
 961         memset(ptr, 0, 7); /* Name: Reserved */
 962         ptr += 7;
 963         i2 = ptr++;
 964
 965         n = dn_neigh_elist(dev, ptr, n);
 966
 967         *i2 = 7 * n;
 968         *i1 = 8 + *i2;
 969
 970         skb_trim(skb, (27 + *i2));
 971
 972         pktlen = (__le16 *)skb_push(skb, 2);
 973         *pktlen = dn_htons(skb->len - 2);
 974
 975         skb->nh.raw = skb->data;
 976
 977         if (dn_am_i_a_router(dn, dn_db, ifa)) {
 978                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
 979                 if (skb2) {
 980                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
 981                 }
 982         }
 983
 984         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
 985 }
 986
 987 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 988 {
 989         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 990
 991         if (dn_db->parms.forwarding == 0)
 992                 dn_send_endnode_hello(dev, ifa);
 993         else
 994                 dn_send_router_hello(dev, ifa);
 995 }
 996
 997 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 998 {
 999         int tdlen = 16;
1000         int size = dev->hard_header_len + 2 + 4 + tdlen;
1001         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1002         int i;
1003         unsigned char *ptr;
1004         char src[ETH_ALEN];
1005
1006         if (skb == NULL)
1007                 return ;
1008
1009         skb->dev = dev;
1010         skb_push(skb, dev->hard_header_len);
1011         ptr = skb_put(skb, 2 + 4 + tdlen);
1012
1013         *ptr++ = DN_RT_PKT_HELO;
1014         *((__le16 *)ptr) = ifa->ifa_local;
1015         ptr += 2;
1016         *ptr++ = tdlen;
1017
1018         for(i = 0; i < tdlen; i++)
1019                 *ptr++ = 0252;
1020
1021         dn_dn2eth(src, ifa->ifa_local);
1022         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1023 }
1024
1025 static int dn_eth_up(struct net_device *dev)
1026 {
1027         struct dn_dev *dn_db = dev->dn_ptr;
1028
1029         if (dn_db->parms.forwarding == 0)
1030                 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1031         else
1032                 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1033
1034         dev_mc_upload(dev);
1035
1036         dn_db->use_long = 1;
1037
1038         return 0;
1039 }
1040
1041 static void dn_eth_down(struct net_device *dev)
1042 {
1043         struct dn_dev *dn_db = dev->dn_ptr;
1044
1045         if (dn_db->parms.forwarding == 0)
1046                 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1047         else
1048                 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1049 }
1050
1051 static void dn_dev_set_timer(struct net_device *dev);
1052
1053 static void dn_dev_timer_func(unsigned long arg)
1054 {
1055         struct net_device *dev = (struct net_device *)arg;
1056         struct dn_dev *dn_db = dev->dn_ptr;
1057         struct dn_ifaddr *ifa;
1058
1059         if (dn_db->t3 <= dn_db->parms.t2) {
1060                 if (dn_db->parms.timer3) {
1061                         for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1062                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1063                                         dn_db->parms.timer3(dev, ifa);
1064                         }
1065                 }
1066                 dn_db->t3 = dn_db->parms.t3;
1067         } else {
1068                 dn_db->t3 -= dn_db->parms.t2;
1069         }
1070
1071         dn_dev_set_timer(dev);
1072 }
1073
1074 static void dn_dev_set_timer(struct net_device *dev)
1075 {
1076         struct dn_dev *dn_db = dev->dn_ptr;
1077
1078         if (dn_db->parms.t2 > dn_db->parms.t3)
1079                 dn_db->parms.t2 = dn_db->parms.t3;
1080
1081         dn_db->timer.data = (unsigned long)dev;
1082         dn_db->timer.function = dn_dev_timer_func;
1083         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1084
1085         add_timer(&dn_db->timer);
1086 }
1087
1088 struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1089 {
1090         int i;
1091         struct dn_dev_parms *p = dn_dev_list;
1092         struct dn_dev *dn_db;
1093
1094         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1095                 if (p->type == dev->type)
1096                         break;
1097         }
1098
1099         *err = -ENODEV;
1100         if (i == DN_DEV_LIST_SIZE)
1101                 return NULL;
1102
1103         *err = -ENOBUFS;
1104         if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1105                 return NULL;
1106
1107         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1108         smp_wmb();
1109         dev->dn_ptr = dn_db;
1110         dn_db->dev = dev;
1111         init_timer(&dn_db->timer);
1112
1113         dn_db->uptime = jiffies;
1114         if (dn_db->parms.up) {
1115                 if (dn_db->parms.up(dev) < 0) {
1116                         dev->dn_ptr = NULL;
1117                         kfree(dn_db);
1118                         return NULL;
1119                 }
1120         }
1121
1122         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1123
1124         dn_dev_sysctl_register(dev, &dn_db->parms);
1125
1126         dn_dev_set_timer(dev);
1127
1128         *err = 0;
1129         return dn_db;
1130 }
1131
1132
1133 /*
1134  * This processes a device up event. We only start up
1135  * the loopback device & ethernet devices with correct
1136  * MAC addreses automatically. Others must be started
1137  * specifically.
1138  *
1139  * FIXME: How should we configure the loopback address ? If we could dispense
1140  * with using decnet_address here and for autobind, it will be one less thing
1141  * for users to worry about setting up.
1142  */
1143
1144 void dn_dev_up(struct net_device *dev)
1145 {
1146         struct dn_ifaddr *ifa;
1147         __le16 addr = decnet_address;
1148         int maybe_default = 0;
1149         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1150
1151         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1152                 return;
1153
1154         /*
1155          * Need to ensure that loopback device has a dn_db attached to it
1156          * to allow creation of neighbours against it, even though it might
1157          * not have a local address of its own. Might as well do the same for
1158          * all autoconfigured interfaces.
1159          */
1160         if (dn_db == NULL) {
1161                 int err;
1162                 dn_db = dn_dev_create(dev, &err);
1163                 if (dn_db == NULL)
1164                         return;
1165         }
1166
1167         if (dev->type == ARPHRD_ETHER) {
1168                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1169                         return;
1170                 addr = dn_eth2dn(dev->dev_addr);
1171                 maybe_default = 1;
1172         }
1173
1174         if (addr == 0)
1175                 return;
1176
1177         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1178                 return;
1179
1180         ifa->ifa_local = ifa->ifa_address = addr;
1181         ifa->ifa_flags = 0;
1182         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1183         strcpy(ifa->ifa_label, dev->name);
1184
1185         dn_dev_set_ifa(dev, ifa);
1186
1187         /*
1188          * Automagically set the default device to the first automatically
1189          * configured ethernet card in the system.
1190          */
1191         if (maybe_default) {
1192                 dev_hold(dev);
1193                 if (dn_dev_set_default(dev, 0))
1194                         dev_put(dev);
1195         }
1196 }
1197
1198 static void dn_dev_delete(struct net_device *dev)
1199 {
1200         struct dn_dev *dn_db = dev->dn_ptr;
1201
1202         if (dn_db == NULL)
1203                 return;
1204
1205         del_timer_sync(&dn_db->timer);
1206         dn_dev_sysctl_unregister(&dn_db->parms);
1207         dn_dev_check_default(dev);
1208         neigh_ifdown(&dn_neigh_table, dev);
1209
1210         if (dn_db->parms.down)
1211                 dn_db->parms.down(dev);
1212
1213         dev->dn_ptr = NULL;
1214
1215         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1216         neigh_ifdown(&dn_neigh_table, dev);
1217
1218         if (dn_db->router)
1219                 neigh_release(dn_db->router);
1220         if (dn_db->peer)
1221                 neigh_release(dn_db->peer);
1222
1223         kfree(dn_db);
1224 }
1225
1226 void dn_dev_down(struct net_device *dev)
1227 {
1228         struct dn_dev *dn_db = dev->dn_ptr;
1229         struct dn_ifaddr *ifa;
1230
1231         if (dn_db == NULL)
1232                 return;
1233
1234         while((ifa = dn_db->ifa_list) != NULL) {
1235                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1236                 dn_dev_free_ifa(ifa);
1237         }
1238
1239         dn_dev_delete(dev);
1240 }
1241
1242 void dn_dev_init_pkt(struct sk_buff *skb)
1243 {
1244         return;
1245 }
1246
1247 void dn_dev_veri_pkt(struct sk_buff *skb)
1248 {
1249         return;
1250 }
1251
1252 void dn_dev_hello(struct sk_buff *skb)
1253 {
1254         return;
1255 }
1256
1257 void dn_dev_devices_off(void)
1258 {
1259         struct net_device *dev;
1260
1261         rtnl_lock();
1262         for(dev = dev_base; dev; dev = dev->next)
1263                 dn_dev_down(dev);
1264         rtnl_unlock();
1265
1266 }
1267
1268 void dn_dev_devices_on(void)
1269 {
1270         struct net_device *dev;
1271
1272         rtnl_lock();
1273         for(dev = dev_base; dev; dev = dev->next) {
1274                 if (dev->flags & IFF_UP)
1275                         dn_dev_up(dev);
1276         }
1277         rtnl_unlock();
1278 }
1279
1280 int register_dnaddr_notifier(struct notifier_block *nb)
1281 {
1282         return blocking_notifier_chain_register(&dnaddr_chain, nb);
1283 }
1284
1285 int unregister_dnaddr_notifier(struct notifier_block *nb)
1286 {
1287         return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1288 }
1289
1290 #ifdef CONFIG_PROC_FS
1291 static inline struct net_device *dn_dev_get_next(struct seq_file *seq, struct net_device *dev)
1292 {
1293         do {
1294                 dev = dev->next;
1295         } while(dev && !dev->dn_ptr);
1296
1297         return dev;
1298 }
1299
1300 static struct net_device *dn_dev_get_idx(struct seq_file *seq, loff_t pos)
1301 {
1302         struct net_device *dev;
1303
1304         dev = dev_base;
1305         if (dev && !dev->dn_ptr)
1306                 dev = dn_dev_get_next(seq, dev);
1307         if (pos) {
1308                 while(dev && (dev = dn_dev_get_next(seq, dev)))
1309                         --pos;
1310         }
1311         return dev;
1312 }
1313
1314 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1315 {
1316         if (*pos) {
1317                 struct net_device *dev;
1318                 read_lock(&dev_base_lock);
1319                 dev = dn_dev_get_idx(seq, *pos - 1);
1320                 if (dev == NULL)
1321                         read_unlock(&dev_base_lock);
1322                 return dev;
1323         }
1324         return SEQ_START_TOKEN;
1325 }
1326
1327 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1328 {
1329         struct net_device *dev = v;
1330         loff_t one = 1;
1331
1332         if (v == SEQ_START_TOKEN) {
1333                 dev = dn_dev_seq_start(seq, &one);
1334         } else {
1335                 dev = dn_dev_get_next(seq, dev);
1336                 if (dev == NULL)
1337                         read_unlock(&dev_base_lock);
1338         }
1339         ++*pos;
1340         return dev;
1341 }
1342
1343 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1344 {
1345         if (v && v != SEQ_START_TOKEN)
1346                 read_unlock(&dev_base_lock);
1347 }
1348
1349 static char *dn_type2asc(char type)
1350 {
1351         switch(type) {
1352                 case DN_DEV_BCAST:
1353                         return "B";
1354                 case DN_DEV_UCAST:
1355                         return "U";
1356                 case DN_DEV_MPOINT:
1357                         return "M";
1358         }
1359
1360         return "?";
1361 }
1362
1363 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1364 {
1365         if (v == SEQ_START_TOKEN)
1366                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1367         else {
1368                 struct net_device *dev = v;
1369                 char peer_buf[DN_ASCBUF_LEN];
1370                 char router_buf[DN_ASCBUF_LEN];
1371                 struct dn_dev *dn_db = dev->dn_ptr;
1372
1373                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1374                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1375                                 dev->name ? dev->name : "???",
1376                                 dn_type2asc(dn_db->parms.mode),
1377                                 0, 0,
1378                                 dn_db->t3, dn_db->parms.t3,
1379                                 mtu2blksize(dev),
1380                                 dn_db->parms.priority,
1381                                 dn_db->parms.state, dn_db->parms.name,
1382                                 dn_db->router ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1383                                 dn_db->peer ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1384         }
1385         return 0;
1386 }
1387
1388 static struct seq_operations dn_dev_seq_ops = {
1389         .start  = dn_dev_seq_start,
1390         .next   = dn_dev_seq_next,
1391         .stop   = dn_dev_seq_stop,
1392         .show   = dn_dev_seq_show,
1393 };
1394
1395 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1396 {
1397         return seq_open(file, &dn_dev_seq_ops);
1398 }
1399
1400 static struct file_operations dn_dev_seq_fops = {
1401         .owner   = THIS_MODULE,
1402         .open    = dn_dev_seq_open,
1403         .read    = seq_read,
1404         .llseek  = seq_lseek,
1405         .release = seq_release,
1406 };
1407
1408 #endif /* CONFIG_PROC_FS */
1409
1410 static struct rtnetlink_link dnet_rtnetlink_table[RTM_NR_MSGTYPES] =
1411 {
1412         [RTM_NEWADDR  - RTM_BASE] = { .doit     = dn_dev_rtm_newaddr,   },
1413         [RTM_DELADDR  - RTM_BASE] = { .doit     = dn_dev_rtm_deladdr,   },
1414         [RTM_GETADDR  - RTM_BASE] = { .dumpit   = dn_dev_dump_ifaddr,   },
1415 #ifdef CONFIG_DECNET_ROUTER
1416         [RTM_NEWROUTE - RTM_BASE] = { .doit     = dn_fib_rtm_newroute,  },
1417         [RTM_DELROUTE - RTM_BASE] = { .doit     = dn_fib_rtm_delroute,  },
1418         [RTM_GETROUTE - RTM_BASE] = { .doit     = dn_cache_getroute,
1419                                       .dumpit   = dn_fib_dump,          },
1420         [RTM_NEWRULE  - RTM_BASE] = { .doit     = dn_fib_rtm_newrule,   },
1421         [RTM_DELRULE  - RTM_BASE] = { .doit     = dn_fib_rtm_delrule,   },
1422         [RTM_GETRULE  - RTM_BASE] = { .dumpit   = dn_fib_dump_rules,    },
1423 #else
1424         [RTM_GETROUTE - RTM_BASE] = { .doit     = dn_cache_getroute,
1425                                       .dumpit   = dn_cache_dump,        },
1426 #endif
1427
1428 };
1429
1430 static int __initdata addr[2];
1431 module_param_array(addr, int, NULL, 0444);
1432 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1433
1434 void __init dn_dev_init(void)
1435 {
1436         if (addr[0] > 63 || addr[0] < 0) {
1437                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1438                 return;
1439         }
1440
1441         if (addr[1] > 1023 || addr[1] < 0) {
1442                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1443                 return;
1444         }
1445
1446         decnet_address = dn_htons((addr[0] << 10) | addr[1]);
1447
1448         dn_dev_devices_on();
1449
1450         rtnetlink_links[PF_DECnet] = dnet_rtnetlink_table;
1451
1452         proc_net_fops_create("decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1453
1454 #ifdef CONFIG_SYSCTL
1455         {
1456                 int i;
1457                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1458                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1459         }
1460 #endif /* CONFIG_SYSCTL */
1461 }
1462
1463 void __exit dn_dev_cleanup(void)
1464 {
1465         rtnetlink_links[PF_DECnet] = NULL;
1466
1467 #ifdef CONFIG_SYSCTL
1468         {
1469                 int i;
1470                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1471                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1472         }
1473 #endif /* CONFIG_SYSCTL */
1474
1475         proc_net_remove("decnet_dev");
1476
1477         dn_dev_devices_off();
1478 }