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/neighbour.h>
  46 #include <net/dst.h>
  47 #include <net/flow.h>
  48 #include <net/fib_rules.h>
  49 #include <net/netlink.h>
  50 #include <net/dn.h>
  51 #include <net/dn_dev.h>
  52 #include <net/dn_route.h>
  53 #include <net/dn_neigh.h>
  54 #include <net/dn_fib.h>
  55
  56 #define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
  57
  58 static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
  59 static char dn_rt_all_rt_mcast[ETH_ALEN]  = {0xAB,0x00,0x00,0x03,0x00,0x00};
  60 static char dn_hiord[ETH_ALEN]            = {0xAA,0x00,0x04,0x00,0x00,0x00};
  61 static unsigned char dn_eco_version[3]    = {0x02,0x00,0x00};
  62
  63 extern struct neigh_table dn_neigh_table;
  64
  65 /*
  66  * decnet_address is kept in network order.
  67  */
  68 __le16 decnet_address = 0;
  69
  70 static DEFINE_RWLOCK(dndev_lock);
  71 static struct net_device *decnet_default_device;
  72 static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
  73
  74 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
  75 static void dn_dev_delete(struct net_device *dev);
  76 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
  77
  78 static int dn_eth_up(struct net_device *);
  79 static void dn_eth_down(struct net_device *);
  80 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  81 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  82
  83 static struct dn_dev_parms dn_dev_list[] =  {
  84 {
  85         .type =         ARPHRD_ETHER, /* Ethernet */
  86         .mode =         DN_DEV_BCAST,
  87         .state =        DN_DEV_S_RU,
  88         .t2 =           1,
  89         .t3 =           10,
  90         .name =         "ethernet",
  91         .ctl_name =     NET_DECNET_CONF_ETHER,
  92         .up =           dn_eth_up,
  93         .down =         dn_eth_down,
  94         .timer3 =       dn_send_brd_hello,
  95 },
  96 {
  97         .type =         ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
  98         .mode =         DN_DEV_BCAST,
  99         .state =        DN_DEV_S_RU,
 100         .t2 =           1,
 101         .t3 =           10,
 102         .name =         "ipgre",
 103         .ctl_name =     NET_DECNET_CONF_GRE,
 104         .timer3 =       dn_send_brd_hello,
 105 },
 106 #if 0
 107 {
 108         .type =         ARPHRD_X25, /* Bog standard X.25 */
 109         .mode =         DN_DEV_UCAST,
 110         .state =        DN_DEV_S_DS,
 111         .t2 =           1,
 112         .t3 =           120,
 113         .name =         "x25",
 114         .ctl_name =     NET_DECNET_CONF_X25,
 115         .timer3 =       dn_send_ptp_hello,
 116 },
 117 #endif
 118 #if 0
 119 {
 120         .type =         ARPHRD_PPP, /* DECnet over PPP */
 121         .mode =         DN_DEV_BCAST,
 122         .state =        DN_DEV_S_RU,
 123         .t2 =           1,
 124         .t3 =           10,
 125         .name =         "ppp",
 126         .ctl_name =     NET_DECNET_CONF_PPP,
 127         .timer3 =       dn_send_brd_hello,
 128 },
 129 #endif
 130 {
 131         .type =         ARPHRD_DDCMP, /* DECnet over DDCMP */
 132         .mode =         DN_DEV_UCAST,
 133         .state =        DN_DEV_S_DS,
 134         .t2 =           1,
 135         .t3 =           120,
 136         .name =         "ddcmp",
 137         .ctl_name =     NET_DECNET_CONF_DDCMP,
 138         .timer3 =       dn_send_ptp_hello,
 139 },
 140 {
 141         .type =         ARPHRD_LOOPBACK, /* Loopback interface - always last */
 142         .mode =         DN_DEV_BCAST,
 143         .state =        DN_DEV_S_RU,
 144         .t2 =           1,
 145         .t3 =           10,
 146         .name =         "loopback",
 147         .ctl_name =     NET_DECNET_CONF_LOOPBACK,
 148         .timer3 =       dn_send_brd_hello,
 149 }
 150 };
 151
 152 #define DN_DEV_LIST_SIZE (sizeof(dn_dev_list)/sizeof(struct dn_dev_parms))
 153
 154 #define DN_DEV_PARMS_OFFSET(x) ((int) ((char *) &((struct dn_dev_parms *)0)->x))
 155
 156 #ifdef CONFIG_SYSCTL
 157
 158 static int min_t2[] = { 1 };
 159 static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
 160 static int min_t3[] = { 1 };
 161 static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
 162
 163 static int min_priority[1];
 164 static int max_priority[] = { 127 }; /* From DECnet spec */
 165
 166 static int dn_forwarding_proc(ctl_table *, int, struct file *,
 167                         void __user *, size_t *, loff_t *);
 168 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
 169                         void __user *oldval, size_t __user *oldlenp,
 170                         void __user *newval, size_t newlen,
 171                         void **context);
 172
 173 static struct dn_dev_sysctl_table {
 174         struct ctl_table_header *sysctl_header;
 175         ctl_table dn_dev_vars[5];
 176         ctl_table dn_dev_dev[2];
 177         ctl_table dn_dev_conf_dir[2];
 178         ctl_table dn_dev_proto_dir[2];
 179         ctl_table dn_dev_root_dir[2];
 180 } dn_dev_sysctl = {
 181         NULL,
 182         {
 183         {
 184                 .ctl_name = NET_DECNET_CONF_DEV_FORWARDING,
 185                 .procname = "forwarding",
 186                 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
 187                 .maxlen = sizeof(int),
 188                 .mode = 0644,
 189                 .proc_handler = dn_forwarding_proc,
 190                 .strategy = dn_forwarding_sysctl,
 191         },
 192         {
 193                 .ctl_name = NET_DECNET_CONF_DEV_PRIORITY,
 194                 .procname = "priority",
 195                 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
 196                 .maxlen = sizeof(int),
 197                 .mode = 0644,
 198                 .proc_handler = proc_dointvec_minmax,
 199                 .strategy = sysctl_intvec,
 200                 .extra1 = &min_priority,
 201                 .extra2 = &max_priority
 202         },
 203         {
 204                 .ctl_name = NET_DECNET_CONF_DEV_T2,
 205                 .procname = "t2",
 206                 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
 207                 .maxlen = sizeof(int),
 208                 .mode = 0644,
 209                 .proc_handler = proc_dointvec_minmax,
 210                 .strategy = sysctl_intvec,
 211                 .extra1 = &min_t2,
 212                 .extra2 = &max_t2
 213         },
 214         {
 215                 .ctl_name = NET_DECNET_CONF_DEV_T3,
 216                 .procname = "t3",
 217                 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
 218                 .maxlen = sizeof(int),
 219                 .mode = 0644,
 220                 .proc_handler = proc_dointvec_minmax,
 221                 .strategy = sysctl_intvec,
 222                 .extra1 = &min_t3,
 223                 .extra2 = &max_t3
 224         },
 225         {0}
 226         },
 227         {{
 228                 .ctl_name = 0,
 229                 .procname = "",
 230                 .mode = 0555,
 231                 .child = dn_dev_sysctl.dn_dev_vars
 232         }, {0}},
 233         {{
 234                 .ctl_name = NET_DECNET_CONF,
 235                 .procname = "conf",
 236                 .mode = 0555,
 237                 .child = dn_dev_sysctl.dn_dev_dev
 238         }, {0}},
 239         {{
 240                 .ctl_name = NET_DECNET,
 241                 .procname = "decnet",
 242                 .mode = 0555,
 243                 .child = dn_dev_sysctl.dn_dev_conf_dir
 244         }, {0}},
 245         {{
 246                 .ctl_name = CTL_NET,
 247                 .procname = "net",
 248                 .mode = 0555,
 249                 .child = dn_dev_sysctl.dn_dev_proto_dir
 250         }, {0}}
 251 };
 252
 253 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 254 {
 255         struct dn_dev_sysctl_table *t;
 256         int i;
 257
 258         t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
 259         if (t == NULL)
 260                 return;
 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         dn_ifaddr_notify(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         dn_ifaddr_notify(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 struct nla_policy dn_ifa_policy[IFA_MAX+1] __read_mostly = {
 649         [IFA_ADDRESS]           = { .type = NLA_U16 },
 650         [IFA_LOCAL]             = { .type = NLA_U16 },
 651         [IFA_LABEL]             = { .type = NLA_STRING,
 652                                     .len = IFNAMSIZ - 1 },
 653 };
 654
 655 static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 656 {
 657         struct nlattr *tb[IFA_MAX+1];
 658         struct dn_dev *dn_db;
 659         struct ifaddrmsg *ifm;
 660         struct dn_ifaddr *ifa, **ifap;
 661         int err = -EADDRNOTAVAIL;
 662
 663         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
 664         if (err < 0)
 665                 goto errout;
 666
 667         ifm = nlmsg_data(nlh);
 668         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
 669                 goto errout;
 670
 671         for (ifap = &dn_db->ifa_list; (ifa = *ifap); ifap = &ifa->ifa_next) {
 672                 if (tb[IFA_LOCAL] &&
 673                     nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
 674                         continue;
 675
 676                 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
 677                         continue;
 678
 679                 dn_dev_del_ifa(dn_db, ifap, 1);
 680                 return 0;
 681         }
 682
 683 errout:
 684         return err;
 685 }
 686
 687 static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 688 {
 689         struct nlattr *tb[IFA_MAX+1];
 690         struct net_device *dev;
 691         struct dn_dev *dn_db;
 692         struct ifaddrmsg *ifm;
 693         struct dn_ifaddr *ifa;
 694         int err;
 695
 696         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
 697         if (err < 0)
 698                 return err;
 699
 700         if (tb[IFA_LOCAL] == NULL)
 701                 return -EINVAL;
 702
 703         ifm = nlmsg_data(nlh);
 704         if ((dev = __dev_get_by_index(ifm->ifa_index)) == NULL)
 705                 return -ENODEV;
 706
 707         if ((dn_db = dev->dn_ptr) == NULL) {
 708                 int err;
 709                 dn_db = dn_dev_create(dev, &err);
 710                 if (!dn_db)
 711                         return err;
 712         }
 713
 714         if ((ifa = dn_dev_alloc_ifa()) == NULL)
 715                 return -ENOBUFS;
 716
 717         if (tb[IFA_ADDRESS] == NULL)
 718                 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
 719
 720         ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
 721         ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
 722         ifa->ifa_flags = ifm->ifa_flags;
 723         ifa->ifa_scope = ifm->ifa_scope;
 724         ifa->ifa_dev = dn_db;
 725
 726         if (tb[IFA_LABEL])
 727                 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
 728         else
 729                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 730
 731         err = dn_dev_insert_ifa(dn_db, ifa);
 732         if (err)
 733                 dn_dev_free_ifa(ifa);
 734
 735         return err;
 736 }
 737
 738 static inline size_t dn_ifaddr_nlmsg_size(void)
 739 {
 740         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
 741                + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
 742                + nla_total_size(2) /* IFA_ADDRESS */
 743                + nla_total_size(2); /* IFA_LOCAL */
 744 }
 745
 746 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
 747                              u32 pid, u32 seq, int event, unsigned int flags)
 748 {
 749         struct ifaddrmsg *ifm;
 750         struct nlmsghdr *nlh;
 751
 752         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
 753         if (nlh == NULL)
 754                 return -ENOBUFS;
 755
 756         ifm = nlmsg_data(nlh);
 757         ifm->ifa_family = AF_DECnet;
 758         ifm->ifa_prefixlen = 16;
 759         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
 760         ifm->ifa_scope = ifa->ifa_scope;
 761         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
 762
 763         if (ifa->ifa_address)
 764                 NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
 765         if (ifa->ifa_local)
 766                 NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
 767         if (ifa->ifa_label[0])
 768                 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
 769
 770         return nlmsg_end(skb, nlh);
 771
 772 nla_put_failure:
 773         return nlmsg_cancel(skb, nlh);
 774 }
 775
 776 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
 777 {
 778         struct sk_buff *skb;
 779         int err = -ENOBUFS;
 780
 781         skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
 782         if (skb == NULL)
 783                 goto errout;
 784
 785         err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
 786         /* failure implies BUG in dn_ifaddr_nlmsg_size() */
 787         BUG_ON(err < 0);
 788
 789         err = rtnl_notify(skb, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
 790 errout:
 791         if (err < 0)
 792                 rtnl_set_sk_err(RTNLGRP_DECnet_IFADDR, err);
 793 }
 794
 795 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 796 {
 797         int idx, dn_idx = 0, skip_ndevs, skip_naddr;
 798         struct net_device *dev;
 799         struct dn_dev *dn_db;
 800         struct dn_ifaddr *ifa;
 801
 802         skip_ndevs = cb->args[0];
 803         skip_naddr = cb->args[1];
 804
 805         read_lock(&dev_base_lock);
 806         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
 807                 if (idx < skip_ndevs)
 808                         continue;
 809                 else if (idx > skip_ndevs) {
 810                         /* Only skip over addresses for first dev dumped
 811                          * in this iteration (idx == skip_ndevs) */
 812                         skip_naddr = 0;
 813                 }
 814
 815                 if ((dn_db = dev->dn_ptr) == NULL)
 816                         continue;
 817
 818                 for (ifa = dn_db->ifa_list, dn_idx = 0; ifa;
 819                      ifa = ifa->ifa_next, dn_idx++) {
 820                         if (dn_idx < skip_naddr)
 821                                 continue;
 822
 823                         if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
 824                                               cb->nlh->nlmsg_seq, RTM_NEWADDR,
 825                                               NLM_F_MULTI) < 0)
 826                                 goto done;
 827                 }
 828         }
 829 done:
 830         read_unlock(&dev_base_lock);
 831
 832         cb->args[0] = idx;
 833         cb->args[1] = dn_idx;
 834
 835         return skb->len;
 836 }
 837
 838 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
 839 {
 840         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 841         struct dn_ifaddr *ifa;
 842         int rv = -ENODEV;
 843         if (dn_db == NULL)
 844                 goto out;
 845         ifa = dn_db->ifa_list;
 846         if (ifa != NULL) {
 847                 *addr = ifa->ifa_local;
 848                 rv = 0;
 849         }
 850 out:
 851         return rv;
 852 }
 853
 854 /*
 855  * Find a default address to bind to.
 856  *
 857  * This is one of those areas where the initial VMS concepts don't really
 858  * map onto the Linux concepts, and since we introduced multiple addresses
 859  * per interface we have to cope with slightly odd ways of finding out what
 860  * "our address" really is. Mostly it's not a problem; for this we just guess
 861  * a sensible default. Eventually the routing code will take care of all the
 862  * nasties for us I hope.
 863  */
 864 int dn_dev_bind_default(__le16 *addr)
 865 {
 866         struct net_device *dev;
 867         int rv;
 868         dev = dn_dev_get_default();
 869 last_chance:
 870         if (dev) {
 871                 read_lock(&dev_base_lock);
 872                 rv = dn_dev_get_first(dev, addr);
 873                 read_unlock(&dev_base_lock);
 874                 dev_put(dev);
 875                 if (rv == 0 || dev == &loopback_dev)
 876                         return rv;
 877         }
 878         dev = &loopback_dev;
 879         dev_hold(dev);
 880         goto last_chance;
 881 }
 882
 883 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 884 {
 885         struct endnode_hello_message *msg;
 886         struct sk_buff *skb = NULL;
 887         __le16 *pktlen;
 888         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 889
 890         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
 891                 return;
 892
 893         skb->dev = dev;
 894
 895         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
 896
 897         msg->msgflg  = 0x0D;
 898         memcpy(msg->tiver, dn_eco_version, 3);
 899         dn_dn2eth(msg->id, ifa->ifa_local);
 900         msg->iinfo   = DN_RT_INFO_ENDN;
 901         msg->blksize = dn_htons(mtu2blksize(dev));
 902         msg->area    = 0x00;
 903         memset(msg->seed, 0, 8);
 904         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
 905
 906         if (dn_db->router) {
 907                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 908                 dn_dn2eth(msg->neighbor, dn->addr);
 909         }
 910
 911         msg->timer   = dn_htons((unsigned short)dn_db->parms.t3);
 912         msg->mpd     = 0x00;
 913         msg->datalen = 0x02;
 914         memset(msg->data, 0xAA, 2);
 915
 916         pktlen = (__le16 *)skb_push(skb,2);
 917         *pktlen = dn_htons(skb->len - 2);
 918
 919         skb->nh.raw = skb->data;
 920
 921         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
 922 }
 923
 924
 925 #define DRDELAY (5 * HZ)
 926
 927 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 928 {
 929         /* First check time since device went up */
 930         if ((jiffies - dn_db->uptime) < DRDELAY)
 931                 return 0;
 932
 933         /* If there is no router, then yes... */
 934         if (!dn_db->router)
 935                 return 1;
 936
 937         /* otherwise only if we have a higher priority or.. */
 938         if (dn->priority < dn_db->parms.priority)
 939                 return 1;
 940
 941         /* if we have equal priority and a higher node number */
 942         if (dn->priority != dn_db->parms.priority)
 943                 return 0;
 944
 945         if (dn_ntohs(dn->addr) < dn_ntohs(ifa->ifa_local))
 946                 return 1;
 947
 948         return 0;
 949 }
 950
 951 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 952 {
 953         int n;
 954         struct dn_dev *dn_db = dev->dn_ptr;
 955         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 956         struct sk_buff *skb;
 957         size_t size;
 958         unsigned char *ptr;
 959         unsigned char *i1, *i2;
 960         __le16 *pktlen;
 961         char *src;
 962
 963         if (mtu2blksize(dev) < (26 + 7))
 964                 return;
 965
 966         n = mtu2blksize(dev) - 26;
 967         n /= 7;
 968
 969         if (n > 32)
 970                 n = 32;
 971
 972         size = 2 + 26 + 7 * n;
 973
 974         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
 975                 return;
 976
 977         skb->dev = dev;
 978         ptr = skb_put(skb, size);
 979
 980         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
 981         *ptr++ = 2; /* ECO */
 982         *ptr++ = 0;
 983         *ptr++ = 0;
 984         dn_dn2eth(ptr, ifa->ifa_local);
 985         src = ptr;
 986         ptr += ETH_ALEN;
 987         *ptr++ = dn_db->parms.forwarding == 1 ?
 988                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
 989         *((__le16 *)ptr) = dn_htons(mtu2blksize(dev));
 990         ptr += 2;
 991         *ptr++ = dn_db->parms.priority; /* Priority */
 992         *ptr++ = 0; /* Area: Reserved */
 993         *((__le16 *)ptr) = dn_htons((unsigned short)dn_db->parms.t3);
 994         ptr += 2;
 995         *ptr++ = 0; /* MPD: Reserved */
 996         i1 = ptr++;
 997         memset(ptr, 0, 7); /* Name: Reserved */
 998         ptr += 7;
 999         i2 = ptr++;
1000
1001         n = dn_neigh_elist(dev, ptr, n);
1002
1003         *i2 = 7 * n;
1004         *i1 = 8 + *i2;
1005
1006         skb_trim(skb, (27 + *i2));
1007
1008         pktlen = (__le16 *)skb_push(skb, 2);
1009         *pktlen = dn_htons(skb->len - 2);
1010
1011         skb->nh.raw = skb->data;
1012
1013         if (dn_am_i_a_router(dn, dn_db, ifa)) {
1014                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
1015                 if (skb2) {
1016                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
1017                 }
1018         }
1019
1020         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1021 }
1022
1023 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1024 {
1025         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1026
1027         if (dn_db->parms.forwarding == 0)
1028                 dn_send_endnode_hello(dev, ifa);
1029         else
1030                 dn_send_router_hello(dev, ifa);
1031 }
1032
1033 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1034 {
1035         int tdlen = 16;
1036         int size = dev->hard_header_len + 2 + 4 + tdlen;
1037         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1038         int i;
1039         unsigned char *ptr;
1040         char src[ETH_ALEN];
1041
1042         if (skb == NULL)
1043                 return ;
1044
1045         skb->dev = dev;
1046         skb_push(skb, dev->hard_header_len);
1047         ptr = skb_put(skb, 2 + 4 + tdlen);
1048
1049         *ptr++ = DN_RT_PKT_HELO;
1050         *((__le16 *)ptr) = ifa->ifa_local;
1051         ptr += 2;
1052         *ptr++ = tdlen;
1053
1054         for(i = 0; i < tdlen; i++)
1055                 *ptr++ = 0252;
1056
1057         dn_dn2eth(src, ifa->ifa_local);
1058         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1059 }
1060
1061 static int dn_eth_up(struct net_device *dev)
1062 {
1063         struct dn_dev *dn_db = dev->dn_ptr;
1064
1065         if (dn_db->parms.forwarding == 0)
1066                 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1067         else
1068                 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1069
1070         dev_mc_upload(dev);
1071
1072         dn_db->use_long = 1;
1073
1074         return 0;
1075 }
1076
1077 static void dn_eth_down(struct net_device *dev)
1078 {
1079         struct dn_dev *dn_db = dev->dn_ptr;
1080
1081         if (dn_db->parms.forwarding == 0)
1082                 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1083         else
1084                 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1085 }
1086
1087 static void dn_dev_set_timer(struct net_device *dev);
1088
1089 static void dn_dev_timer_func(unsigned long arg)
1090 {
1091         struct net_device *dev = (struct net_device *)arg;
1092         struct dn_dev *dn_db = dev->dn_ptr;
1093         struct dn_ifaddr *ifa;
1094
1095         if (dn_db->t3 <= dn_db->parms.t2) {
1096                 if (dn_db->parms.timer3) {
1097                         for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1098                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1099                                         dn_db->parms.timer3(dev, ifa);
1100                         }
1101                 }
1102                 dn_db->t3 = dn_db->parms.t3;
1103         } else {
1104                 dn_db->t3 -= dn_db->parms.t2;
1105         }
1106
1107         dn_dev_set_timer(dev);
1108 }
1109
1110 static void dn_dev_set_timer(struct net_device *dev)
1111 {
1112         struct dn_dev *dn_db = dev->dn_ptr;
1113
1114         if (dn_db->parms.t2 > dn_db->parms.t3)
1115                 dn_db->parms.t2 = dn_db->parms.t3;
1116
1117         dn_db->timer.data = (unsigned long)dev;
1118         dn_db->timer.function = dn_dev_timer_func;
1119         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1120
1121         add_timer(&dn_db->timer);
1122 }
1123
1124 struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1125 {
1126         int i;
1127         struct dn_dev_parms *p = dn_dev_list;
1128         struct dn_dev *dn_db;
1129
1130         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1131                 if (p->type == dev->type)
1132                         break;
1133         }
1134
1135         *err = -ENODEV;
1136         if (i == DN_DEV_LIST_SIZE)
1137                 return NULL;
1138
1139         *err = -ENOBUFS;
1140         if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1141                 return NULL;
1142
1143         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1144         smp_wmb();
1145         dev->dn_ptr = dn_db;
1146         dn_db->dev = dev;
1147         init_timer(&dn_db->timer);
1148
1149         dn_db->uptime = jiffies;
1150         if (dn_db->parms.up) {
1151                 if (dn_db->parms.up(dev) < 0) {
1152                         dev->dn_ptr = NULL;
1153                         kfree(dn_db);
1154                         return NULL;
1155                 }
1156         }
1157
1158         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1159
1160         dn_dev_sysctl_register(dev, &dn_db->parms);
1161
1162         dn_dev_set_timer(dev);
1163
1164         *err = 0;
1165         return dn_db;
1166 }
1167
1168
1169 /*
1170  * This processes a device up event. We only start up
1171  * the loopback device & ethernet devices with correct
1172  * MAC addreses automatically. Others must be started
1173  * specifically.
1174  *
1175  * FIXME: How should we configure the loopback address ? If we could dispense
1176  * with using decnet_address here and for autobind, it will be one less thing
1177  * for users to worry about setting up.
1178  */
1179
1180 void dn_dev_up(struct net_device *dev)
1181 {
1182         struct dn_ifaddr *ifa;
1183         __le16 addr = decnet_address;
1184         int maybe_default = 0;
1185         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1186
1187         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1188                 return;
1189
1190         /*
1191          * Need to ensure that loopback device has a dn_db attached to it
1192          * to allow creation of neighbours against it, even though it might
1193          * not have a local address of its own. Might as well do the same for
1194          * all autoconfigured interfaces.
1195          */
1196         if (dn_db == NULL) {
1197                 int err;
1198                 dn_db = dn_dev_create(dev, &err);
1199                 if (dn_db == NULL)
1200                         return;
1201         }
1202
1203         if (dev->type == ARPHRD_ETHER) {
1204                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1205                         return;
1206                 addr = dn_eth2dn(dev->dev_addr);
1207                 maybe_default = 1;
1208         }
1209
1210         if (addr == 0)
1211                 return;
1212
1213         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1214                 return;
1215
1216         ifa->ifa_local = ifa->ifa_address = addr;
1217         ifa->ifa_flags = 0;
1218         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1219         strcpy(ifa->ifa_label, dev->name);
1220
1221         dn_dev_set_ifa(dev, ifa);
1222
1223         /*
1224          * Automagically set the default device to the first automatically
1225          * configured ethernet card in the system.
1226          */
1227         if (maybe_default) {
1228                 dev_hold(dev);
1229                 if (dn_dev_set_default(dev, 0))
1230                         dev_put(dev);
1231         }
1232 }
1233
1234 static void dn_dev_delete(struct net_device *dev)
1235 {
1236         struct dn_dev *dn_db = dev->dn_ptr;
1237
1238         if (dn_db == NULL)
1239                 return;
1240
1241         del_timer_sync(&dn_db->timer);
1242         dn_dev_sysctl_unregister(&dn_db->parms);
1243         dn_dev_check_default(dev);
1244         neigh_ifdown(&dn_neigh_table, dev);
1245
1246         if (dn_db->parms.down)
1247                 dn_db->parms.down(dev);
1248
1249         dev->dn_ptr = NULL;
1250
1251         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1252         neigh_ifdown(&dn_neigh_table, dev);
1253
1254         if (dn_db->router)
1255                 neigh_release(dn_db->router);
1256         if (dn_db->peer)
1257                 neigh_release(dn_db->peer);
1258
1259         kfree(dn_db);
1260 }
1261
1262 void dn_dev_down(struct net_device *dev)
1263 {
1264         struct dn_dev *dn_db = dev->dn_ptr;
1265         struct dn_ifaddr *ifa;
1266
1267         if (dn_db == NULL)
1268                 return;
1269
1270         while((ifa = dn_db->ifa_list) != NULL) {
1271                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1272                 dn_dev_free_ifa(ifa);
1273         }
1274
1275         dn_dev_delete(dev);
1276 }
1277
1278 void dn_dev_init_pkt(struct sk_buff *skb)
1279 {
1280         return;
1281 }
1282
1283 void dn_dev_veri_pkt(struct sk_buff *skb)
1284 {
1285         return;
1286 }
1287
1288 void dn_dev_hello(struct sk_buff *skb)
1289 {
1290         return;
1291 }
1292
1293 void dn_dev_devices_off(void)
1294 {
1295         struct net_device *dev;
1296
1297         rtnl_lock();
1298         for(dev = dev_base; dev; dev = dev->next)
1299                 dn_dev_down(dev);
1300         rtnl_unlock();
1301
1302 }
1303
1304 void dn_dev_devices_on(void)
1305 {
1306         struct net_device *dev;
1307
1308         rtnl_lock();
1309         for(dev = dev_base; dev; dev = dev->next) {
1310                 if (dev->flags & IFF_UP)
1311                         dn_dev_up(dev);
1312         }
1313         rtnl_unlock();
1314 }
1315
1316 int register_dnaddr_notifier(struct notifier_block *nb)
1317 {
1318         return blocking_notifier_chain_register(&dnaddr_chain, nb);
1319 }
1320
1321 int unregister_dnaddr_notifier(struct notifier_block *nb)
1322 {
1323         return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1324 }
1325
1326 #ifdef CONFIG_PROC_FS
1327 static inline struct net_device *dn_dev_get_next(struct seq_file *seq, struct net_device *dev)
1328 {
1329         do {
1330                 dev = dev->next;
1331         } while(dev && !dev->dn_ptr);
1332
1333         return dev;
1334 }
1335
1336 static struct net_device *dn_dev_get_idx(struct seq_file *seq, loff_t pos)
1337 {
1338         struct net_device *dev;
1339
1340         dev = dev_base;
1341         if (dev && !dev->dn_ptr)
1342                 dev = dn_dev_get_next(seq, dev);
1343         if (pos) {
1344                 while(dev && (dev = dn_dev_get_next(seq, dev)))
1345                         --pos;
1346         }
1347         return dev;
1348 }
1349
1350 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1351 {
1352         if (*pos) {
1353                 struct net_device *dev;
1354                 read_lock(&dev_base_lock);
1355                 dev = dn_dev_get_idx(seq, *pos - 1);
1356                 if (dev == NULL)
1357                         read_unlock(&dev_base_lock);
1358                 return dev;
1359         }
1360         return SEQ_START_TOKEN;
1361 }
1362
1363 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1364 {
1365         struct net_device *dev = v;
1366         loff_t one = 1;
1367
1368         if (v == SEQ_START_TOKEN) {
1369                 dev = dn_dev_seq_start(seq, &one);
1370         } else {
1371                 dev = dn_dev_get_next(seq, dev);
1372                 if (dev == NULL)
1373                         read_unlock(&dev_base_lock);
1374         }
1375         ++*pos;
1376         return dev;
1377 }
1378
1379 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1380 {
1381         if (v && v != SEQ_START_TOKEN)
1382                 read_unlock(&dev_base_lock);
1383 }
1384
1385 static char *dn_type2asc(char type)
1386 {
1387         switch(type) {
1388                 case DN_DEV_BCAST:
1389                         return "B";
1390                 case DN_DEV_UCAST:
1391                         return "U";
1392                 case DN_DEV_MPOINT:
1393                         return "M";
1394         }
1395
1396         return "?";
1397 }
1398
1399 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1400 {
1401         if (v == SEQ_START_TOKEN)
1402                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1403         else {
1404                 struct net_device *dev = v;
1405                 char peer_buf[DN_ASCBUF_LEN];
1406                 char router_buf[DN_ASCBUF_LEN];
1407                 struct dn_dev *dn_db = dev->dn_ptr;
1408
1409                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1410                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1411                                 dev->name ? dev->name : "???",
1412                                 dn_type2asc(dn_db->parms.mode),
1413                                 0, 0,
1414                                 dn_db->t3, dn_db->parms.t3,
1415                                 mtu2blksize(dev),
1416                                 dn_db->parms.priority,
1417                                 dn_db->parms.state, dn_db->parms.name,
1418                                 dn_db->router ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1419                                 dn_db->peer ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1420         }
1421         return 0;
1422 }
1423
1424 static struct seq_operations dn_dev_seq_ops = {
1425         .start  = dn_dev_seq_start,
1426         .next   = dn_dev_seq_next,
1427         .stop   = dn_dev_seq_stop,
1428         .show   = dn_dev_seq_show,
1429 };
1430
1431 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1432 {
1433         return seq_open(file, &dn_dev_seq_ops);
1434 }
1435
1436 static struct file_operations dn_dev_seq_fops = {
1437         .owner   = THIS_MODULE,
1438         .open    = dn_dev_seq_open,
1439         .read    = seq_read,
1440         .llseek  = seq_lseek,
1441         .release = seq_release,
1442 };
1443
1444 #endif /* CONFIG_PROC_FS */
1445
1446 static struct rtnetlink_link dnet_rtnetlink_table[RTM_NR_MSGTYPES] =
1447 {
1448         [RTM_NEWADDR  - RTM_BASE] = { .doit     = dn_nl_newaddr,        },
1449         [RTM_DELADDR  - RTM_BASE] = { .doit     = dn_nl_deladdr,        },
1450         [RTM_GETADDR  - RTM_BASE] = { .dumpit   = dn_nl_dump_ifaddr,    },
1451 #ifdef CONFIG_DECNET_ROUTER
1452         [RTM_NEWROUTE - RTM_BASE] = { .doit     = dn_fib_rtm_newroute,  },
1453         [RTM_DELROUTE - RTM_BASE] = { .doit     = dn_fib_rtm_delroute,  },
1454         [RTM_GETROUTE - RTM_BASE] = { .doit     = dn_cache_getroute,
1455                                       .dumpit   = dn_fib_dump,          },
1456         [RTM_GETRULE  - RTM_BASE] = { .dumpit   = dn_fib_dump_rules,    },
1457 #else
1458         [RTM_GETROUTE - RTM_BASE] = { .doit     = dn_cache_getroute,
1459                                       .dumpit   = dn_cache_dump,        },
1460 #endif
1461
1462 };
1463
1464 static int __initdata addr[2];
1465 module_param_array(addr, int, NULL, 0444);
1466 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1467
1468 void __init dn_dev_init(void)
1469 {
1470         if (addr[0] > 63 || addr[0] < 0) {
1471                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1472                 return;
1473         }
1474
1475         if (addr[1] > 1023 || addr[1] < 0) {
1476                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1477                 return;
1478         }
1479
1480         decnet_address = dn_htons((addr[0] << 10) | addr[1]);
1481
1482         dn_dev_devices_on();
1483
1484         rtnetlink_links[PF_DECnet] = dnet_rtnetlink_table;
1485
1486         proc_net_fops_create("decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1487
1488 #ifdef CONFIG_SYSCTL
1489         {
1490                 int i;
1491                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1492                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1493         }
1494 #endif /* CONFIG_SYSCTL */
1495 }
1496
1497 void __exit dn_dev_cleanup(void)
1498 {
1499         rtnetlink_links[PF_DECnet] = NULL;
1500
1501 #ifdef CONFIG_SYSCTL
1502         {
1503                 int i;
1504                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1505                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1506         }
1507 #endif /* CONFIG_SYSCTL */
1508
1509         proc_net_remove("decnet_dev");
1510
1511         dn_dev_devices_off();
1512 }