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   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 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 inline size_t dn_ifaddr_nlmsg_size(void)
 715 {
 716         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
 717                + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
 718                + nla_total_size(2) /* IFA_ADDRESS */
 719                + nla_total_size(2); /* IFA_LOCAL */
 720 }
 721
 722 static int dn_dev_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
 723                                 u32 pid, u32 seq, int event, unsigned int flags)
 724 {
 725         struct ifaddrmsg *ifm;
 726         struct nlmsghdr *nlh;
 727         unsigned char *b = skb->tail;
 728
 729         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
 730         ifm = NLMSG_DATA(nlh);
 731
 732         ifm->ifa_family = AF_DECnet;
 733         ifm->ifa_prefixlen = 16;
 734         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
 735         ifm->ifa_scope = ifa->ifa_scope;
 736         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
 737         if (ifa->ifa_address)
 738                 RTA_PUT(skb, IFA_ADDRESS, 2, &ifa->ifa_address);
 739         if (ifa->ifa_local)
 740                 RTA_PUT(skb, IFA_LOCAL, 2, &ifa->ifa_local);
 741         if (ifa->ifa_label[0])
 742                 RTA_PUT(skb, IFA_LABEL, IFNAMSIZ, &ifa->ifa_label);
 743         nlh->nlmsg_len = skb->tail - b;
 744         return skb->len;
 745
 746 nlmsg_failure:
 747 rtattr_failure:
 748         skb_trim(skb, b - skb->data);
 749         return -1;
 750 }
 751
 752 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
 753 {
 754         struct sk_buff *skb;
 755         int err = -ENOBUFS;
 756
 757         skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
 758         if (skb == NULL)
 759                 goto errout;
 760
 761         err = dn_dev_fill_ifaddr(skb, ifa, 0, 0, event, 0);
 762         /* failure implies BUG in dn_ifaddr_nlmsg_size() */
 763         BUG_ON(err < 0);
 764
 765         err = rtnl_notify(skb, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
 766 errout:
 767         if (err < 0)
 768                 rtnl_set_sk_err(RTNLGRP_DECnet_IFADDR, err);
 769 }
 770
 771 static int dn_dev_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 772 {
 773         int idx, dn_idx;
 774         int s_idx, s_dn_idx;
 775         struct net_device *dev;
 776         struct dn_dev *dn_db;
 777         struct dn_ifaddr *ifa;
 778
 779         s_idx = cb->args[0];
 780         s_dn_idx = dn_idx = cb->args[1];
 781         read_lock(&dev_base_lock);
 782         for(dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
 783                 if (idx < s_idx)
 784                         continue;
 785                 if (idx > s_idx)
 786                         s_dn_idx = 0;
 787                 if ((dn_db = dev->dn_ptr) == NULL)
 788                         continue;
 789
 790                 for(ifa = dn_db->ifa_list, dn_idx = 0; ifa; ifa = ifa->ifa_next, dn_idx++) {
 791                         if (dn_idx < s_dn_idx)
 792                                 continue;
 793
 794                         if (dn_dev_fill_ifaddr(skb, ifa,
 795                                                NETLINK_CB(cb->skb).pid,
 796                                                cb->nlh->nlmsg_seq,
 797                                                RTM_NEWADDR,
 798                                                NLM_F_MULTI) <= 0)
 799                                 goto done;
 800                 }
 801         }
 802 done:
 803         read_unlock(&dev_base_lock);
 804         cb->args[0] = idx;
 805         cb->args[1] = dn_idx;
 806
 807         return skb->len;
 808 }
 809
 810 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
 811 {
 812         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 813         struct dn_ifaddr *ifa;
 814         int rv = -ENODEV;
 815         if (dn_db == NULL)
 816                 goto out;
 817         ifa = dn_db->ifa_list;
 818         if (ifa != NULL) {
 819                 *addr = ifa->ifa_local;
 820                 rv = 0;
 821         }
 822 out:
 823         return rv;
 824 }
 825
 826 /*
 827  * Find a default address to bind to.
 828  *
 829  * This is one of those areas where the initial VMS concepts don't really
 830  * map onto the Linux concepts, and since we introduced multiple addresses
 831  * per interface we have to cope with slightly odd ways of finding out what
 832  * "our address" really is. Mostly it's not a problem; for this we just guess
 833  * a sensible default. Eventually the routing code will take care of all the
 834  * nasties for us I hope.
 835  */
 836 int dn_dev_bind_default(__le16 *addr)
 837 {
 838         struct net_device *dev;
 839         int rv;
 840         dev = dn_dev_get_default();
 841 last_chance:
 842         if (dev) {
 843                 read_lock(&dev_base_lock);
 844                 rv = dn_dev_get_first(dev, addr);
 845                 read_unlock(&dev_base_lock);
 846                 dev_put(dev);
 847                 if (rv == 0 || dev == &loopback_dev)
 848                         return rv;
 849         }
 850         dev = &loopback_dev;
 851         dev_hold(dev);
 852         goto last_chance;
 853 }
 854
 855 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 856 {
 857         struct endnode_hello_message *msg;
 858         struct sk_buff *skb = NULL;
 859         __le16 *pktlen;
 860         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 861
 862         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
 863                 return;
 864
 865         skb->dev = dev;
 866
 867         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
 868
 869         msg->msgflg  = 0x0D;
 870         memcpy(msg->tiver, dn_eco_version, 3);
 871         dn_dn2eth(msg->id, ifa->ifa_local);
 872         msg->iinfo   = DN_RT_INFO_ENDN;
 873         msg->blksize = dn_htons(mtu2blksize(dev));
 874         msg->area    = 0x00;
 875         memset(msg->seed, 0, 8);
 876         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
 877
 878         if (dn_db->router) {
 879                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 880                 dn_dn2eth(msg->neighbor, dn->addr);
 881         }
 882
 883         msg->timer   = dn_htons((unsigned short)dn_db->parms.t3);
 884         msg->mpd     = 0x00;
 885         msg->datalen = 0x02;
 886         memset(msg->data, 0xAA, 2);
 887
 888         pktlen = (__le16 *)skb_push(skb,2);
 889         *pktlen = dn_htons(skb->len - 2);
 890
 891         skb->nh.raw = skb->data;
 892
 893         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
 894 }
 895
 896
 897 #define DRDELAY (5 * HZ)
 898
 899 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 900 {
 901         /* First check time since device went up */
 902         if ((jiffies - dn_db->uptime) < DRDELAY)
 903                 return 0;
 904
 905         /* If there is no router, then yes... */
 906         if (!dn_db->router)
 907                 return 1;
 908
 909         /* otherwise only if we have a higher priority or.. */
 910         if (dn->priority < dn_db->parms.priority)
 911                 return 1;
 912
 913         /* if we have equal priority and a higher node number */
 914         if (dn->priority != dn_db->parms.priority)
 915                 return 0;
 916
 917         if (dn_ntohs(dn->addr) < dn_ntohs(ifa->ifa_local))
 918                 return 1;
 919
 920         return 0;
 921 }
 922
 923 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 924 {
 925         int n;
 926         struct dn_dev *dn_db = dev->dn_ptr;
 927         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 928         struct sk_buff *skb;
 929         size_t size;
 930         unsigned char *ptr;
 931         unsigned char *i1, *i2;
 932         __le16 *pktlen;
 933         char *src;
 934
 935         if (mtu2blksize(dev) < (26 + 7))
 936                 return;
 937
 938         n = mtu2blksize(dev) - 26;
 939         n /= 7;
 940
 941         if (n > 32)
 942                 n = 32;
 943
 944         size = 2 + 26 + 7 * n;
 945
 946         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
 947                 return;
 948
 949         skb->dev = dev;
 950         ptr = skb_put(skb, size);
 951
 952         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
 953         *ptr++ = 2; /* ECO */
 954         *ptr++ = 0;
 955         *ptr++ = 0;
 956         dn_dn2eth(ptr, ifa->ifa_local);
 957         src = ptr;
 958         ptr += ETH_ALEN;
 959         *ptr++ = dn_db->parms.forwarding == 1 ?
 960                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
 961         *((__le16 *)ptr) = dn_htons(mtu2blksize(dev));
 962         ptr += 2;
 963         *ptr++ = dn_db->parms.priority; /* Priority */
 964         *ptr++ = 0; /* Area: Reserved */
 965         *((__le16 *)ptr) = dn_htons((unsigned short)dn_db->parms.t3);
 966         ptr += 2;
 967         *ptr++ = 0; /* MPD: Reserved */
 968         i1 = ptr++;
 969         memset(ptr, 0, 7); /* Name: Reserved */
 970         ptr += 7;
 971         i2 = ptr++;
 972
 973         n = dn_neigh_elist(dev, ptr, n);
 974
 975         *i2 = 7 * n;
 976         *i1 = 8 + *i2;
 977
 978         skb_trim(skb, (27 + *i2));
 979
 980         pktlen = (__le16 *)skb_push(skb, 2);
 981         *pktlen = dn_htons(skb->len - 2);
 982
 983         skb->nh.raw = skb->data;
 984
 985         if (dn_am_i_a_router(dn, dn_db, ifa)) {
 986                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
 987                 if (skb2) {
 988                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
 989                 }
 990         }
 991
 992         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
 993 }
 994
 995 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 996 {
 997         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 998
 999         if (dn_db->parms.forwarding == 0)
1000                 dn_send_endnode_hello(dev, ifa);
1001         else
1002                 dn_send_router_hello(dev, ifa);
1003 }
1004
1005 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1006 {
1007         int tdlen = 16;
1008         int size = dev->hard_header_len + 2 + 4 + tdlen;
1009         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1010         int i;
1011         unsigned char *ptr;
1012         char src[ETH_ALEN];
1013
1014         if (skb == NULL)
1015                 return ;
1016
1017         skb->dev = dev;
1018         skb_push(skb, dev->hard_header_len);
1019         ptr = skb_put(skb, 2 + 4 + tdlen);
1020
1021         *ptr++ = DN_RT_PKT_HELO;
1022         *((__le16 *)ptr) = ifa->ifa_local;
1023         ptr += 2;
1024         *ptr++ = tdlen;
1025
1026         for(i = 0; i < tdlen; i++)
1027                 *ptr++ = 0252;
1028
1029         dn_dn2eth(src, ifa->ifa_local);
1030         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1031 }
1032
1033 static int dn_eth_up(struct net_device *dev)
1034 {
1035         struct dn_dev *dn_db = dev->dn_ptr;
1036
1037         if (dn_db->parms.forwarding == 0)
1038                 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1039         else
1040                 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1041
1042         dev_mc_upload(dev);
1043
1044         dn_db->use_long = 1;
1045
1046         return 0;
1047 }
1048
1049 static void dn_eth_down(struct net_device *dev)
1050 {
1051         struct dn_dev *dn_db = dev->dn_ptr;
1052
1053         if (dn_db->parms.forwarding == 0)
1054                 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1055         else
1056                 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1057 }
1058
1059 static void dn_dev_set_timer(struct net_device *dev);
1060
1061 static void dn_dev_timer_func(unsigned long arg)
1062 {
1063         struct net_device *dev = (struct net_device *)arg;
1064         struct dn_dev *dn_db = dev->dn_ptr;
1065         struct dn_ifaddr *ifa;
1066
1067         if (dn_db->t3 <= dn_db->parms.t2) {
1068                 if (dn_db->parms.timer3) {
1069                         for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1070                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1071                                         dn_db->parms.timer3(dev, ifa);
1072                         }
1073                 }
1074                 dn_db->t3 = dn_db->parms.t3;
1075         } else {
1076                 dn_db->t3 -= dn_db->parms.t2;
1077         }
1078
1079         dn_dev_set_timer(dev);
1080 }
1081
1082 static void dn_dev_set_timer(struct net_device *dev)
1083 {
1084         struct dn_dev *dn_db = dev->dn_ptr;
1085
1086         if (dn_db->parms.t2 > dn_db->parms.t3)
1087                 dn_db->parms.t2 = dn_db->parms.t3;
1088
1089         dn_db->timer.data = (unsigned long)dev;
1090         dn_db->timer.function = dn_dev_timer_func;
1091         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1092
1093         add_timer(&dn_db->timer);
1094 }
1095
1096 struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1097 {
1098         int i;
1099         struct dn_dev_parms *p = dn_dev_list;
1100         struct dn_dev *dn_db;
1101
1102         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1103                 if (p->type == dev->type)
1104                         break;
1105         }
1106
1107         *err = -ENODEV;
1108         if (i == DN_DEV_LIST_SIZE)
1109                 return NULL;
1110
1111         *err = -ENOBUFS;
1112         if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1113                 return NULL;
1114
1115         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1116         smp_wmb();
1117         dev->dn_ptr = dn_db;
1118         dn_db->dev = dev;
1119         init_timer(&dn_db->timer);
1120
1121         dn_db->uptime = jiffies;
1122         if (dn_db->parms.up) {
1123                 if (dn_db->parms.up(dev) < 0) {
1124                         dev->dn_ptr = NULL;
1125                         kfree(dn_db);
1126                         return NULL;
1127                 }
1128         }
1129
1130         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1131
1132         dn_dev_sysctl_register(dev, &dn_db->parms);
1133
1134         dn_dev_set_timer(dev);
1135
1136         *err = 0;
1137         return dn_db;
1138 }
1139
1140
1141 /*
1142  * This processes a device up event. We only start up
1143  * the loopback device & ethernet devices with correct
1144  * MAC addreses automatically. Others must be started
1145  * specifically.
1146  *
1147  * FIXME: How should we configure the loopback address ? If we could dispense
1148  * with using decnet_address here and for autobind, it will be one less thing
1149  * for users to worry about setting up.
1150  */
1151
1152 void dn_dev_up(struct net_device *dev)
1153 {
1154         struct dn_ifaddr *ifa;
1155         __le16 addr = decnet_address;
1156         int maybe_default = 0;
1157         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1158
1159         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1160                 return;
1161
1162         /*
1163          * Need to ensure that loopback device has a dn_db attached to it
1164          * to allow creation of neighbours against it, even though it might
1165          * not have a local address of its own. Might as well do the same for
1166          * all autoconfigured interfaces.
1167          */
1168         if (dn_db == NULL) {
1169                 int err;
1170                 dn_db = dn_dev_create(dev, &err);
1171                 if (dn_db == NULL)
1172                         return;
1173         }
1174
1175         if (dev->type == ARPHRD_ETHER) {
1176                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1177                         return;
1178                 addr = dn_eth2dn(dev->dev_addr);
1179                 maybe_default = 1;
1180         }
1181
1182         if (addr == 0)
1183                 return;
1184
1185         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1186                 return;
1187
1188         ifa->ifa_local = ifa->ifa_address = addr;
1189         ifa->ifa_flags = 0;
1190         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1191         strcpy(ifa->ifa_label, dev->name);
1192
1193         dn_dev_set_ifa(dev, ifa);
1194
1195         /*
1196          * Automagically set the default device to the first automatically
1197          * configured ethernet card in the system.
1198          */
1199         if (maybe_default) {
1200                 dev_hold(dev);
1201                 if (dn_dev_set_default(dev, 0))
1202                         dev_put(dev);
1203         }
1204 }
1205
1206 static void dn_dev_delete(struct net_device *dev)
1207 {
1208         struct dn_dev *dn_db = dev->dn_ptr;
1209
1210         if (dn_db == NULL)
1211                 return;
1212
1213         del_timer_sync(&dn_db->timer);
1214         dn_dev_sysctl_unregister(&dn_db->parms);
1215         dn_dev_check_default(dev);
1216         neigh_ifdown(&dn_neigh_table, dev);
1217
1218         if (dn_db->parms.down)
1219                 dn_db->parms.down(dev);
1220
1221         dev->dn_ptr = NULL;
1222
1223         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1224         neigh_ifdown(&dn_neigh_table, dev);
1225
1226         if (dn_db->router)
1227                 neigh_release(dn_db->router);
1228         if (dn_db->peer)
1229                 neigh_release(dn_db->peer);
1230
1231         kfree(dn_db);
1232 }
1233
1234 void dn_dev_down(struct net_device *dev)
1235 {
1236         struct dn_dev *dn_db = dev->dn_ptr;
1237         struct dn_ifaddr *ifa;
1238
1239         if (dn_db == NULL)
1240                 return;
1241
1242         while((ifa = dn_db->ifa_list) != NULL) {
1243                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1244                 dn_dev_free_ifa(ifa);
1245         }
1246
1247         dn_dev_delete(dev);
1248 }
1249
1250 void dn_dev_init_pkt(struct sk_buff *skb)
1251 {
1252         return;
1253 }
1254
1255 void dn_dev_veri_pkt(struct sk_buff *skb)
1256 {
1257         return;
1258 }
1259
1260 void dn_dev_hello(struct sk_buff *skb)
1261 {
1262         return;
1263 }
1264
1265 void dn_dev_devices_off(void)
1266 {
1267         struct net_device *dev;
1268
1269         rtnl_lock();
1270         for(dev = dev_base; dev; dev = dev->next)
1271                 dn_dev_down(dev);
1272         rtnl_unlock();
1273
1274 }
1275
1276 void dn_dev_devices_on(void)
1277 {
1278         struct net_device *dev;
1279
1280         rtnl_lock();
1281         for(dev = dev_base; dev; dev = dev->next) {
1282                 if (dev->flags & IFF_UP)
1283                         dn_dev_up(dev);
1284         }
1285         rtnl_unlock();
1286 }
1287
1288 int register_dnaddr_notifier(struct notifier_block *nb)
1289 {
1290         return blocking_notifier_chain_register(&dnaddr_chain, nb);
1291 }
1292
1293 int unregister_dnaddr_notifier(struct notifier_block *nb)
1294 {
1295         return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1296 }
1297
1298 #ifdef CONFIG_PROC_FS
1299 static inline struct net_device *dn_dev_get_next(struct seq_file *seq, struct net_device *dev)
1300 {
1301         do {
1302                 dev = dev->next;
1303         } while(dev && !dev->dn_ptr);
1304
1305         return dev;
1306 }
1307
1308 static struct net_device *dn_dev_get_idx(struct seq_file *seq, loff_t pos)
1309 {
1310         struct net_device *dev;
1311
1312         dev = dev_base;
1313         if (dev && !dev->dn_ptr)
1314                 dev = dn_dev_get_next(seq, dev);
1315         if (pos) {
1316                 while(dev && (dev = dn_dev_get_next(seq, dev)))
1317                         --pos;
1318         }
1319         return dev;
1320 }
1321
1322 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1323 {
1324         if (*pos) {
1325                 struct net_device *dev;
1326                 read_lock(&dev_base_lock);
1327                 dev = dn_dev_get_idx(seq, *pos - 1);
1328                 if (dev == NULL)
1329                         read_unlock(&dev_base_lock);
1330                 return dev;
1331         }
1332         return SEQ_START_TOKEN;
1333 }
1334
1335 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1336 {
1337         struct net_device *dev = v;
1338         loff_t one = 1;
1339
1340         if (v == SEQ_START_TOKEN) {
1341                 dev = dn_dev_seq_start(seq, &one);
1342         } else {
1343                 dev = dn_dev_get_next(seq, dev);
1344                 if (dev == NULL)
1345                         read_unlock(&dev_base_lock);
1346         }
1347         ++*pos;
1348         return dev;
1349 }
1350
1351 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1352 {
1353         if (v && v != SEQ_START_TOKEN)
1354                 read_unlock(&dev_base_lock);
1355 }
1356
1357 static char *dn_type2asc(char type)
1358 {
1359         switch(type) {
1360                 case DN_DEV_BCAST:
1361                         return "B";
1362                 case DN_DEV_UCAST:
1363                         return "U";
1364                 case DN_DEV_MPOINT:
1365                         return "M";
1366         }
1367
1368         return "?";
1369 }
1370
1371 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1372 {
1373         if (v == SEQ_START_TOKEN)
1374                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1375         else {
1376                 struct net_device *dev = v;
1377                 char peer_buf[DN_ASCBUF_LEN];
1378                 char router_buf[DN_ASCBUF_LEN];
1379                 struct dn_dev *dn_db = dev->dn_ptr;
1380
1381                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1382                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1383                                 dev->name ? dev->name : "???",
1384                                 dn_type2asc(dn_db->parms.mode),
1385                                 0, 0,
1386                                 dn_db->t3, dn_db->parms.t3,
1387                                 mtu2blksize(dev),
1388                                 dn_db->parms.priority,
1389                                 dn_db->parms.state, dn_db->parms.name,
1390                                 dn_db->router ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1391                                 dn_db->peer ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1392         }
1393         return 0;
1394 }
1395
1396 static struct seq_operations dn_dev_seq_ops = {
1397         .start  = dn_dev_seq_start,
1398         .next   = dn_dev_seq_next,
1399         .stop   = dn_dev_seq_stop,
1400         .show   = dn_dev_seq_show,
1401 };
1402
1403 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1404 {
1405         return seq_open(file, &dn_dev_seq_ops);
1406 }
1407
1408 static struct file_operations dn_dev_seq_fops = {
1409         .owner   = THIS_MODULE,
1410         .open    = dn_dev_seq_open,
1411         .read    = seq_read,
1412         .llseek  = seq_lseek,
1413         .release = seq_release,
1414 };
1415
1416 #endif /* CONFIG_PROC_FS */
1417
1418 static struct rtnetlink_link dnet_rtnetlink_table[RTM_NR_MSGTYPES] =
1419 {
1420         [RTM_NEWADDR  - RTM_BASE] = { .doit     = dn_dev_rtm_newaddr,   },
1421         [RTM_DELADDR  - RTM_BASE] = { .doit     = dn_dev_rtm_deladdr,   },
1422         [RTM_GETADDR  - RTM_BASE] = { .dumpit   = dn_dev_dump_ifaddr,   },
1423 #ifdef CONFIG_DECNET_ROUTER
1424         [RTM_NEWROUTE - RTM_BASE] = { .doit     = dn_fib_rtm_newroute,  },
1425         [RTM_DELROUTE - RTM_BASE] = { .doit     = dn_fib_rtm_delroute,  },
1426         [RTM_GETROUTE - RTM_BASE] = { .doit     = dn_cache_getroute,
1427                                       .dumpit   = dn_fib_dump,          },
1428         [RTM_GETRULE  - RTM_BASE] = { .dumpit   = dn_fib_dump_rules,    },
1429 #else
1430         [RTM_GETROUTE - RTM_BASE] = { .doit     = dn_cache_getroute,
1431                                       .dumpit   = dn_cache_dump,        },
1432 #endif
1433
1434 };
1435
1436 static int __initdata addr[2];
1437 module_param_array(addr, int, NULL, 0444);
1438 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1439
1440 void __init dn_dev_init(void)
1441 {
1442         if (addr[0] > 63 || addr[0] < 0) {
1443                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1444                 return;
1445         }
1446
1447         if (addr[1] > 1023 || addr[1] < 0) {
1448                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1449                 return;
1450         }
1451
1452         decnet_address = dn_htons((addr[0] << 10) | addr[1]);
1453
1454         dn_dev_devices_on();
1455
1456         rtnetlink_links[PF_DECnet] = dnet_rtnetlink_table;
1457
1458         proc_net_fops_create("decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1459
1460 #ifdef CONFIG_SYSCTL
1461         {
1462                 int i;
1463                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1464                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1465         }
1466 #endif /* CONFIG_SYSCTL */
1467 }
1468
1469 void __exit dn_dev_cleanup(void)
1470 {
1471         rtnetlink_links[PF_DECnet] = NULL;
1472
1473 #ifdef CONFIG_SYSCTL
1474         {
1475                 int i;
1476                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1477                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1478         }
1479 #endif /* CONFIG_SYSCTL */
1480
1481         proc_net_remove("decnet_dev");
1482
1483         dn_dev_devices_off();
1484 }