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/config.h>
  28 #include <linux/module.h>
  29 #include <linux/moduleparam.h>
  30 #include <linux/init.h>
  31 #include <linux/net.h>
  32 #include <linux/netdevice.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/timer.h>
  36 #include <linux/string.h>
  37 #include <linux/if_arp.h>
  38 #include <linux/if_ether.h>
  39 #include <linux/skbuff.h>
  40 #include <linux/rtnetlink.h>
  41 #include <linux/sysctl.h>
  42 #include <linux/notifier.h>
  43 #include <asm/uaccess.h>
  44 #include <asm/system.h>
  45 #include <net/neighbour.h>
  46 #include <net/dst.h>
  47 #include <net/flow.h>
  48 #include <net/dn.h>
  49 #include <net/dn_dev.h>
  50 #include <net/dn_route.h>
  51 #include <net/dn_neigh.h>
  52 #include <net/dn_fib.h>
  53
  54 #define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
  55
  56 static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
  57 static char dn_rt_all_rt_mcast[ETH_ALEN]  = {0xAB,0x00,0x00,0x03,0x00,0x00};
  58 static char dn_hiord[ETH_ALEN]            = {0xAA,0x00,0x04,0x00,0x00,0x00};
  59 static unsigned char dn_eco_version[3]    = {0x02,0x00,0x00};
  60
  61 extern struct neigh_table dn_neigh_table;
  62
  63 /*
  64  * decnet_address is kept in network order.
  65  */
  66 dn_address decnet_address = 0;
  67
  68 static DEFINE_RWLOCK(dndev_lock);
  69 static struct net_device *decnet_default_device;
  70 static struct notifier_block *dnaddr_chain;
  71
  72 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
  73 static void dn_dev_delete(struct net_device *dev);
  74 static void rtmsg_ifa(int event, struct dn_ifaddr *ifa);
  75
  76 static int dn_eth_up(struct net_device *);
  77 static void dn_eth_down(struct net_device *);
  78 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  79 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  80
  81 static struct dn_dev_parms dn_dev_list[] =  {
  82 {
  83         .type =         ARPHRD_ETHER, /* Ethernet */
  84         .mode =         DN_DEV_BCAST,
  85         .state =        DN_DEV_S_RU,
  86         .t2 =           1,
  87         .t3 =           10,
  88         .name =         "ethernet",
  89         .ctl_name =     NET_DECNET_CONF_ETHER,
  90         .up =           dn_eth_up,
  91         .down =         dn_eth_down,
  92         .timer3 =       dn_send_brd_hello,
  93 },
  94 {
  95         .type =         ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
  96         .mode =         DN_DEV_BCAST,
  97         .state =        DN_DEV_S_RU,
  98         .t2 =           1,
  99         .t3 =           10,
 100         .name =         "ipgre",
 101         .ctl_name =     NET_DECNET_CONF_GRE,
 102         .timer3 =       dn_send_brd_hello,
 103 },
 104 #if 0
 105 {
 106         .type =         ARPHRD_X25, /* Bog standard X.25 */
 107         .mode =         DN_DEV_UCAST,
 108         .state =        DN_DEV_S_DS,
 109         .t2 =           1,
 110         .t3 =           120,
 111         .name =         "x25",
 112         .ctl_name =     NET_DECNET_CONF_X25,
 113         .timer3 =       dn_send_ptp_hello,
 114 },
 115 #endif
 116 #if 0
 117 {
 118         .type =         ARPHRD_PPP, /* DECnet over PPP */
 119         .mode =         DN_DEV_BCAST,
 120         .state =        DN_DEV_S_RU,
 121         .t2 =           1,
 122         .t3 =           10,
 123         .name =         "ppp",
 124         .ctl_name =     NET_DECNET_CONF_PPP,
 125         .timer3 =       dn_send_brd_hello,
 126 },
 127 #endif
 128 {
 129         .type =         ARPHRD_DDCMP, /* DECnet over DDCMP */
 130         .mode =         DN_DEV_UCAST,
 131         .state =        DN_DEV_S_DS,
 132         .t2 =           1,
 133         .t3 =           120,
 134         .name =         "ddcmp",
 135         .ctl_name =     NET_DECNET_CONF_DDCMP,
 136         .timer3 =       dn_send_ptp_hello,
 137 },
 138 {
 139         .type =         ARPHRD_LOOPBACK, /* Loopback interface - always last */
 140         .mode =         DN_DEV_BCAST,
 141         .state =        DN_DEV_S_RU,
 142         .t2 =           1,
 143         .t3 =           10,
 144         .name =         "loopback",
 145         .ctl_name =     NET_DECNET_CONF_LOOPBACK,
 146         .timer3 =       dn_send_brd_hello,
 147 }
 148 };
 149
 150 #define DN_DEV_LIST_SIZE (sizeof(dn_dev_list)/sizeof(struct dn_dev_parms))
 151
 152 #define DN_DEV_PARMS_OFFSET(x) ((int) ((char *) &((struct dn_dev_parms *)0)->x))
 153
 154 #ifdef CONFIG_SYSCTL
 155
 156 static int min_t2[] = { 1 };
 157 static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
 158 static int min_t3[] = { 1 };
 159 static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
 160
 161 static int min_priority[1];
 162 static int max_priority[] = { 127 }; /* From DECnet spec */
 163
 164 static int dn_forwarding_proc(ctl_table *, int, struct file *,
 165                         void __user *, size_t *, loff_t *);
 166 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
 167                         void __user *oldval, size_t __user *oldlenp,
 168                         void __user *newval, size_t newlen,
 169                         void **context);
 170
 171 static struct dn_dev_sysctl_table {
 172         struct ctl_table_header *sysctl_header;
 173         ctl_table dn_dev_vars[5];
 174         ctl_table dn_dev_dev[2];
 175         ctl_table dn_dev_conf_dir[2];
 176         ctl_table dn_dev_proto_dir[2];
 177         ctl_table dn_dev_root_dir[2];
 178 } dn_dev_sysctl = {
 179         NULL,
 180         {
 181         {
 182                 .ctl_name = NET_DECNET_CONF_DEV_FORWARDING,
 183                 .procname = "forwarding",
 184                 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
 185                 .maxlen = sizeof(int),
 186                 .mode = 0644,
 187                 .proc_handler = dn_forwarding_proc,
 188                 .strategy = dn_forwarding_sysctl,
 189         },
 190         {
 191                 .ctl_name = NET_DECNET_CONF_DEV_PRIORITY,
 192                 .procname = "priority",
 193                 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
 194                 .maxlen = sizeof(int),
 195                 .mode = 0644,
 196                 .proc_handler = proc_dointvec_minmax,
 197                 .strategy = sysctl_intvec,
 198                 .extra1 = &min_priority,
 199                 .extra2 = &max_priority
 200         },
 201         {
 202                 .ctl_name = NET_DECNET_CONF_DEV_T2,
 203                 .procname = "t2",
 204                 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
 205                 .maxlen = sizeof(int),
 206                 .mode = 0644,
 207                 .proc_handler = proc_dointvec_minmax,
 208                 .strategy = sysctl_intvec,
 209                 .extra1 = &min_t2,
 210                 .extra2 = &max_t2
 211         },
 212         {
 213                 .ctl_name = NET_DECNET_CONF_DEV_T3,
 214                 .procname = "t3",
 215                 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
 216                 .maxlen = sizeof(int),
 217                 .mode = 0644,
 218                 .proc_handler = proc_dointvec_minmax,
 219                 .strategy = sysctl_intvec,
 220                 .extra1 = &min_t3,
 221                 .extra2 = &max_t3
 222         },
 223         {0}
 224         },
 225         {{
 226                 .ctl_name = 0,
 227                 .procname = "",
 228                 .mode = 0555,
 229                 .child = dn_dev_sysctl.dn_dev_vars
 230         }, {0}},
 231         {{
 232                 .ctl_name = NET_DECNET_CONF,
 233                 .procname = "conf",
 234                 .mode = 0555,
 235                 .child = dn_dev_sysctl.dn_dev_dev
 236         }, {0}},
 237         {{
 238                 .ctl_name = NET_DECNET,
 239                 .procname = "decnet",
 240                 .mode = 0555,
 241                 .child = dn_dev_sysctl.dn_dev_conf_dir
 242         }, {0}},
 243         {{
 244                 .ctl_name = CTL_NET,
 245                 .procname = "net",
 246                 .mode = 0555,
 247                 .child = dn_dev_sysctl.dn_dev_proto_dir
 248         }, {0}}
 249 };
 250
 251 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 252 {
 253         struct dn_dev_sysctl_table *t;
 254         int i;
 255
 256         t = kmalloc(sizeof(*t), GFP_KERNEL);
 257         if (t == NULL)
 258                 return;
 259
 260         memcpy(t, &dn_dev_sysctl, sizeof(*t));
 261
 262         for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
 263                 long offset = (long)t->dn_dev_vars[i].data;
 264                 t->dn_dev_vars[i].data = ((char *)parms) + offset;
 265                 t->dn_dev_vars[i].de = NULL;
 266         }
 267
 268         if (dev) {
 269                 t->dn_dev_dev[0].procname = dev->name;
 270                 t->dn_dev_dev[0].ctl_name = dev->ifindex;
 271         } else {
 272                 t->dn_dev_dev[0].procname = parms->name;
 273                 t->dn_dev_dev[0].ctl_name = parms->ctl_name;
 274         }
 275
 276         t->dn_dev_dev[0].child = t->dn_dev_vars;
 277         t->dn_dev_dev[0].de = NULL;
 278         t->dn_dev_conf_dir[0].child = t->dn_dev_dev;
 279         t->dn_dev_conf_dir[0].de = NULL;
 280         t->dn_dev_proto_dir[0].child = t->dn_dev_conf_dir;
 281         t->dn_dev_proto_dir[0].de = NULL;
 282         t->dn_dev_root_dir[0].child = t->dn_dev_proto_dir;
 283         t->dn_dev_root_dir[0].de = NULL;
 284         t->dn_dev_vars[0].extra1 = (void *)dev;
 285
 286         t->sysctl_header = register_sysctl_table(t->dn_dev_root_dir, 0);
 287         if (t->sysctl_header == NULL)
 288                 kfree(t);
 289         else
 290                 parms->sysctl = t;
 291 }
 292
 293 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 294 {
 295         if (parms->sysctl) {
 296                 struct dn_dev_sysctl_table *t = parms->sysctl;
 297                 parms->sysctl = NULL;
 298                 unregister_sysctl_table(t->sysctl_header);
 299                 kfree(t);
 300         }
 301 }
 302
 303 static int dn_forwarding_proc(ctl_table *table, int write,
 304                                 struct file *filep,
 305                                 void __user *buffer,
 306                                 size_t *lenp, loff_t *ppos)
 307 {
 308 #ifdef CONFIG_DECNET_ROUTER
 309         struct net_device *dev = table->extra1;
 310         struct dn_dev *dn_db;
 311         int err;
 312         int tmp, old;
 313
 314         if (table->extra1 == NULL)
 315                 return -EINVAL;
 316
 317         dn_db = dev->dn_ptr;
 318         old = dn_db->parms.forwarding;
 319
 320         err = proc_dointvec(table, write, filep, buffer, lenp, ppos);
 321
 322         if ((err >= 0) && write) {
 323                 if (dn_db->parms.forwarding < 0)
 324                         dn_db->parms.forwarding = 0;
 325                 if (dn_db->parms.forwarding > 2)
 326                         dn_db->parms.forwarding = 2;
 327                 /*
 328                  * What an ugly hack this is... its works, just. It
 329                  * would be nice if sysctl/proc were just that little
 330                  * bit more flexible so I don't have to write a special
 331                  * routine, or suffer hacks like this - SJW
 332                  */
 333                 tmp = dn_db->parms.forwarding;
 334                 dn_db->parms.forwarding = old;
 335                 if (dn_db->parms.down)
 336                         dn_db->parms.down(dev);
 337                 dn_db->parms.forwarding = tmp;
 338                 if (dn_db->parms.up)
 339                         dn_db->parms.up(dev);
 340         }
 341
 342         return err;
 343 #else
 344         return -EINVAL;
 345 #endif
 346 }
 347
 348 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
 349                         void __user *oldval, size_t __user *oldlenp,
 350                         void __user *newval, size_t newlen,
 351                         void **context)
 352 {
 353 #ifdef CONFIG_DECNET_ROUTER
 354         struct net_device *dev = table->extra1;
 355         struct dn_dev *dn_db;
 356         int value;
 357
 358         if (table->extra1 == NULL)
 359                 return -EINVAL;
 360
 361         dn_db = dev->dn_ptr;
 362
 363         if (newval && newlen) {
 364                 if (newlen != sizeof(int))
 365                         return -EINVAL;
 366
 367                 if (get_user(value, (int __user *)newval))
 368                         return -EFAULT;
 369                 if (value < 0)
 370                         return -EINVAL;
 371                 if (value > 2)
 372                         return -EINVAL;
 373
 374                 if (dn_db->parms.down)
 375                         dn_db->parms.down(dev);
 376                 dn_db->parms.forwarding = value;
 377                 if (dn_db->parms.up)
 378                         dn_db->parms.up(dev);
 379         }
 380
 381         return 0;
 382 #else
 383         return -EINVAL;
 384 #endif
 385 }
 386
 387 #else /* CONFIG_SYSCTL */
 388 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 389 {
 390 }
 391 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 392 {
 393 }
 394
 395 #endif /* CONFIG_SYSCTL */
 396
 397 static inline __u16 mtu2blksize(struct net_device *dev)
 398 {
 399         u32 blksize = dev->mtu;
 400         if (blksize > 0xffff)
 401                 blksize = 0xffff;
 402
 403         if (dev->type == ARPHRD_ETHER ||
 404             dev->type == ARPHRD_PPP ||
 405             dev->type == ARPHRD_IPGRE ||
 406             dev->type == ARPHRD_LOOPBACK)
 407                 blksize -= 2;
 408
 409         return (__u16)blksize;
 410 }
 411
 412 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
 413 {
 414         struct dn_ifaddr *ifa;
 415
 416         ifa = kmalloc(sizeof(*ifa), GFP_KERNEL);
 417
 418         if (ifa) {
 419                 memset(ifa, 0, sizeof(*ifa));
 420         }
 421
 422         return ifa;
 423 }
 424
 425 static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
 426 {
 427         kfree(ifa);
 428 }
 429
 430 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
 431 {
 432         struct dn_ifaddr *ifa1 = *ifap;
 433         unsigned char mac_addr[6];
 434         struct net_device *dev = dn_db->dev;
 435
 436         ASSERT_RTNL();
 437
 438         *ifap = ifa1->ifa_next;
 439
 440         if (dn_db->dev->type == ARPHRD_ETHER) {
 441                 if (ifa1->ifa_local != dn_htons(dn_eth2dn(dev->dev_addr))) {
 442                         dn_dn2eth(mac_addr, ifa1->ifa_local);
 443                         dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
 444                 }
 445         }
 446
 447         rtmsg_ifa(RTM_DELADDR, ifa1);
 448         notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
 449         if (destroy) {
 450                 dn_dev_free_ifa(ifa1);
 451
 452                 if (dn_db->ifa_list == NULL)
 453                         dn_dev_delete(dn_db->dev);
 454         }
 455 }
 456
 457 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 458 {
 459         struct net_device *dev = dn_db->dev;
 460         struct dn_ifaddr *ifa1;
 461         unsigned char mac_addr[6];
 462
 463         ASSERT_RTNL();
 464
 465         /* Check for duplicates */
 466         for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
 467                 if (ifa1->ifa_local == ifa->ifa_local)
 468                         return -EEXIST;
 469         }
 470
 471         if (dev->type == ARPHRD_ETHER) {
 472                 if (ifa->ifa_local != dn_htons(dn_eth2dn(dev->dev_addr))) {
 473                         dn_dn2eth(mac_addr, ifa->ifa_local);
 474                         dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
 475                         dev_mc_upload(dev);
 476                 }
 477         }
 478
 479         ifa->ifa_next = dn_db->ifa_list;
 480         dn_db->ifa_list = ifa;
 481
 482         rtmsg_ifa(RTM_NEWADDR, ifa);
 483         notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
 484
 485         return 0;
 486 }
 487
 488 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
 489 {
 490         struct dn_dev *dn_db = dev->dn_ptr;
 491         int rv;
 492
 493         if (dn_db == NULL) {
 494                 int err;
 495                 dn_db = dn_dev_create(dev, &err);
 496                 if (dn_db == NULL)
 497                         return err;
 498         }
 499
 500         ifa->ifa_dev = dn_db;
 501
 502         if (dev->flags & IFF_LOOPBACK)
 503                 ifa->ifa_scope = RT_SCOPE_HOST;
 504
 505         rv = dn_dev_insert_ifa(dn_db, ifa);
 506         if (rv)
 507                 dn_dev_free_ifa(ifa);
 508         return rv;
 509 }
 510
 511
 512 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
 513 {
 514         char buffer[DN_IFREQ_SIZE];
 515         struct ifreq *ifr = (struct ifreq *)buffer;
 516         struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
 517         struct dn_dev *dn_db;
 518         struct net_device *dev;
 519         struct dn_ifaddr *ifa = NULL, **ifap = NULL;
 520         int ret = 0;
 521
 522         if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
 523                 return -EFAULT;
 524         ifr->ifr_name[IFNAMSIZ-1] = 0;
 525
 526 #ifdef CONFIG_KMOD
 527         dev_load(ifr->ifr_name);
 528 #endif
 529
 530         switch(cmd) {
 531                 case SIOCGIFADDR:
 532                         break;
 533                 case SIOCSIFADDR:
 534                         if (!capable(CAP_NET_ADMIN))
 535                                 return -EACCES;
 536                         if (sdn->sdn_family != AF_DECnet)
 537                                 return -EINVAL;
 538                         break;
 539                 default:
 540                         return -EINVAL;
 541         }
 542
 543         rtnl_lock();
 544
 545         if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL) {
 546                 ret = -ENODEV;
 547                 goto done;
 548         }
 549
 550         if ((dn_db = dev->dn_ptr) != NULL) {
 551                 for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
 552                         if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
 553                                 break;
 554         }
 555
 556         if (ifa == NULL && cmd != SIOCSIFADDR) {
 557                 ret = -EADDRNOTAVAIL;
 558                 goto done;
 559         }
 560
 561         switch(cmd) {
 562                 case SIOCGIFADDR:
 563                         *((dn_address *)sdn->sdn_nodeaddr) = ifa->ifa_local;
 564                         goto rarok;
 565
 566                 case SIOCSIFADDR:
 567                         if (!ifa) {
 568                                 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
 569                                         ret = -ENOBUFS;
 570                                         break;
 571                                 }
 572                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 573                         } else {
 574                                 if (ifa->ifa_local == dn_saddr2dn(sdn))
 575                                         break;
 576                                 dn_dev_del_ifa(dn_db, ifap, 0);
 577                         }
 578
 579                         ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
 580
 581                         ret = dn_dev_set_ifa(dev, ifa);
 582         }
 583 done:
 584         rtnl_unlock();
 585
 586         return ret;
 587 rarok:
 588         if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
 589                 ret = -EFAULT;
 590         goto done;
 591 }
 592
 593 struct net_device *dn_dev_get_default(void)
 594 {
 595         struct net_device *dev;
 596         read_lock(&dndev_lock);
 597         dev = decnet_default_device;
 598         if (dev) {
 599                 if (dev->dn_ptr)
 600                         dev_hold(dev);
 601                 else
 602                         dev = NULL;
 603         }
 604         read_unlock(&dndev_lock);
 605         return dev;
 606 }
 607
 608 int dn_dev_set_default(struct net_device *dev, int force)
 609 {
 610         struct net_device *old = NULL;
 611         int rv = -EBUSY;
 612         if (!dev->dn_ptr)
 613                 return -ENODEV;
 614         write_lock(&dndev_lock);
 615         if (force || decnet_default_device == NULL) {
 616                 old = decnet_default_device;
 617                 decnet_default_device = dev;
 618                 rv = 0;
 619         }
 620         write_unlock(&dndev_lock);
 621         if (old)
 622                 dev_put(dev);
 623         return rv;
 624 }
 625
 626 static void dn_dev_check_default(struct net_device *dev)
 627 {
 628         write_lock(&dndev_lock);
 629         if (dev == decnet_default_device) {
 630                 decnet_default_device = NULL;
 631         } else {
 632                 dev = NULL;
 633         }
 634         write_unlock(&dndev_lock);
 635         if (dev)
 636                 dev_put(dev);
 637 }
 638
 639 static struct dn_dev *dn_dev_by_index(int ifindex)
 640 {
 641         struct net_device *dev;
 642         struct dn_dev *dn_dev = NULL;
 643         dev = dev_get_by_index(ifindex);
 644         if (dev) {
 645                 dn_dev = dev->dn_ptr;
 646                 dev_put(dev);
 647         }
 648
 649         return dn_dev;
 650 }
 651
 652 static int dn_dev_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 653 {
 654         struct rtattr **rta = arg;
 655         struct dn_dev *dn_db;
 656         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
 657         struct dn_ifaddr *ifa, **ifap;
 658
 659         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
 660                 return -EADDRNOTAVAIL;
 661
 662         for(ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next) {
 663                 void *tmp = rta[IFA_LOCAL-1];
 664                 if ((tmp && memcmp(RTA_DATA(tmp), &ifa->ifa_local, 2)) ||
 665                     (rta[IFA_LABEL-1] && rtattr_strcmp(rta[IFA_LABEL-1], ifa->ifa_label)))
 666                         continue;
 667
 668                 dn_dev_del_ifa(dn_db, ifap, 1);
 669                 return 0;
 670         }
 671
 672         return -EADDRNOTAVAIL;
 673 }
 674
 675 static int dn_dev_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 676 {
 677         struct rtattr **rta = arg;
 678         struct net_device *dev;
 679         struct dn_dev *dn_db;
 680         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
 681         struct dn_ifaddr *ifa;
 682         int rv;
 683
 684         if (rta[IFA_LOCAL-1] == NULL)
 685                 return -EINVAL;
 686
 687         if ((dev = __dev_get_by_index(ifm->ifa_index)) == NULL)
 688                 return -ENODEV;
 689
 690         if ((dn_db = dev->dn_ptr) == NULL) {
 691                 int err;
 692                 dn_db = dn_dev_create(dev, &err);
 693                 if (!dn_db)
 694                         return err;
 695         }
 696
 697         if ((ifa = dn_dev_alloc_ifa()) == NULL)
 698                 return -ENOBUFS;
 699
 700         if (!rta[IFA_ADDRESS - 1])
 701                 rta[IFA_ADDRESS - 1] = rta[IFA_LOCAL - 1];
 702         memcpy(&ifa->ifa_local, RTA_DATA(rta[IFA_LOCAL-1]), 2);
 703         memcpy(&ifa->ifa_address, RTA_DATA(rta[IFA_ADDRESS-1]), 2);
 704         ifa->ifa_flags = ifm->ifa_flags;
 705         ifa->ifa_scope = ifm->ifa_scope;
 706         ifa->ifa_dev = dn_db;
 707         if (rta[IFA_LABEL-1])
 708                 rtattr_strlcpy(ifa->ifa_label, rta[IFA_LABEL-1], IFNAMSIZ);
 709         else
 710                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 711
 712         rv = dn_dev_insert_ifa(dn_db, ifa);
 713         if (rv)
 714                 dn_dev_free_ifa(ifa);
 715         return rv;
 716 }
 717
 718 static int dn_dev_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
 719                                 u32 pid, u32 seq, int event)
 720 {
 721         struct ifaddrmsg *ifm;
 722         struct nlmsghdr *nlh;
 723         unsigned char *b = skb->tail;
 724
 725         nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*ifm));
 726         ifm = NLMSG_DATA(nlh);
 727
 728         ifm->ifa_family = AF_DECnet;
 729         ifm->ifa_prefixlen = 16;
 730         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
 731         ifm->ifa_scope = ifa->ifa_scope;
 732         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
 733         if (ifa->ifa_address)
 734                 RTA_PUT(skb, IFA_ADDRESS, 2, &ifa->ifa_address);
 735         if (ifa->ifa_local)
 736                 RTA_PUT(skb, IFA_LOCAL, 2, &ifa->ifa_local);
 737         if (ifa->ifa_label[0])
 738                 RTA_PUT(skb, IFA_LABEL, IFNAMSIZ, &ifa->ifa_label);
 739         nlh->nlmsg_len = skb->tail - b;
 740         return skb->len;
 741
 742 nlmsg_failure:
 743 rtattr_failure:
 744         skb_trim(skb, b - skb->data);
 745         return -1;
 746 }
 747
 748 static void rtmsg_ifa(int event, struct dn_ifaddr *ifa)
 749 {
 750         struct sk_buff *skb;
 751         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
 752
 753         skb = alloc_skb(size, GFP_KERNEL);
 754         if (!skb) {
 755                 netlink_set_err(rtnl, 0, RTMGRP_DECnet_IFADDR, ENOBUFS);
 756                 return;
 757         }
 758         if (dn_dev_fill_ifaddr(skb, ifa, 0, 0, event) < 0) {
 759                 kfree_skb(skb);
 760                 netlink_set_err(rtnl, 0, RTMGRP_DECnet_IFADDR, EINVAL);
 761                 return;
 762         }
 763         NETLINK_CB(skb).dst_groups = RTMGRP_DECnet_IFADDR;
 764         netlink_broadcast(rtnl, skb, 0, RTMGRP_DECnet_IFADDR, GFP_KERNEL);
 765 }
 766
 767 static int dn_dev_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 768 {
 769         int idx, dn_idx;
 770         int s_idx, s_dn_idx;
 771         struct net_device *dev;
 772         struct dn_dev *dn_db;
 773         struct dn_ifaddr *ifa;
 774
 775         s_idx = cb->args[0];
 776         s_dn_idx = dn_idx = cb->args[1];
 777         read_lock(&dev_base_lock);
 778         for(dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
 779                 if (idx < s_idx)
 780                         continue;
 781                 if (idx > s_idx)
 782                         s_dn_idx = 0;
 783                 if ((dn_db = dev->dn_ptr) == NULL)
 784                         continue;
 785
 786                 for(ifa = dn_db->ifa_list, dn_idx = 0; ifa; ifa = ifa->ifa_next, dn_idx++) {
 787                         if (dn_idx < s_dn_idx)
 788                                 continue;
 789
 790                         if (dn_dev_fill_ifaddr(skb, ifa,
 791                                                NETLINK_CB(cb->skb).pid,
 792                                                cb->nlh->nlmsg_seq,
 793                                                RTM_NEWADDR) <= 0)
 794                                 goto done;
 795                 }
 796         }
 797 done:
 798         read_unlock(&dev_base_lock);
 799         cb->args[0] = idx;
 800         cb->args[1] = dn_idx;
 801
 802         return skb->len;
 803 }
 804
 805 static int dn_dev_get_first(struct net_device *dev, dn_address *addr)
 806 {
 807         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 808         struct dn_ifaddr *ifa;
 809         int rv = -ENODEV;
 810         if (dn_db == NULL)
 811                 goto out;
 812         ifa = dn_db->ifa_list;
 813         if (ifa != NULL) {
 814                 *addr = ifa->ifa_local;
 815                 rv = 0;
 816         }
 817 out:
 818         return rv;
 819 }
 820
 821 /*
 822  * Find a default address to bind to.
 823  *
 824  * This is one of those areas where the initial VMS concepts don't really
 825  * map onto the Linux concepts, and since we introduced multiple addresses
 826  * per interface we have to cope with slightly odd ways of finding out what
 827  * "our address" really is. Mostly it's not a problem; for this we just guess
 828  * a sensible default. Eventually the routing code will take care of all the
 829  * nasties for us I hope.
 830  */
 831 int dn_dev_bind_default(dn_address *addr)
 832 {
 833         struct net_device *dev;
 834         int rv;
 835         dev = dn_dev_get_default();
 836 last_chance:
 837         if (dev) {
 838                 read_lock(&dev_base_lock);
 839                 rv = dn_dev_get_first(dev, addr);
 840                 read_unlock(&dev_base_lock);
 841                 dev_put(dev);
 842                 if (rv == 0 || dev == &loopback_dev)
 843                         return rv;
 844         }
 845         dev = &loopback_dev;
 846         dev_hold(dev);
 847         goto last_chance;
 848 }
 849
 850 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 851 {
 852         struct endnode_hello_message *msg;
 853         struct sk_buff *skb = NULL;
 854         unsigned short int *pktlen;
 855         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 856
 857         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
 858                 return;
 859
 860         skb->dev = dev;
 861
 862         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
 863
 864         msg->msgflg  = 0x0D;
 865         memcpy(msg->tiver, dn_eco_version, 3);
 866         dn_dn2eth(msg->id, ifa->ifa_local);
 867         msg->iinfo   = DN_RT_INFO_ENDN;
 868         msg->blksize = dn_htons(mtu2blksize(dev));
 869         msg->area    = 0x00;
 870         memset(msg->seed, 0, 8);
 871         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
 872
 873         if (dn_db->router) {
 874                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 875                 dn_dn2eth(msg->neighbor, dn->addr);
 876         }
 877
 878         msg->timer   = dn_htons((unsigned short)dn_db->parms.t3);
 879         msg->mpd     = 0x00;
 880         msg->datalen = 0x02;
 881         memset(msg->data, 0xAA, 2);
 882
 883         pktlen = (unsigned short *)skb_push(skb,2);
 884         *pktlen = dn_htons(skb->len - 2);
 885
 886         skb->nh.raw = skb->data;
 887
 888         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
 889 }
 890
 891
 892 #define DRDELAY (5 * HZ)
 893
 894 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 895 {
 896         /* First check time since device went up */
 897         if ((jiffies - dn_db->uptime) < DRDELAY)
 898                 return 0;
 899
 900         /* If there is no router, then yes... */
 901         if (!dn_db->router)
 902                 return 1;
 903
 904         /* otherwise only if we have a higher priority or.. */
 905         if (dn->priority < dn_db->parms.priority)
 906                 return 1;
 907
 908         /* if we have equal priority and a higher node number */
 909         if (dn->priority != dn_db->parms.priority)
 910                 return 0;
 911
 912         if (dn_ntohs(dn->addr) < dn_ntohs(ifa->ifa_local))
 913                 return 1;
 914
 915         return 0;
 916 }
 917
 918 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 919 {
 920         int n;
 921         struct dn_dev *dn_db = dev->dn_ptr;
 922         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 923         struct sk_buff *skb;
 924         size_t size;
 925         unsigned char *ptr;
 926         unsigned char *i1, *i2;
 927         unsigned short *pktlen;
 928         char *src;
 929
 930         if (mtu2blksize(dev) < (26 + 7))
 931                 return;
 932
 933         n = mtu2blksize(dev) - 26;
 934         n /= 7;
 935
 936         if (n > 32)
 937                 n = 32;
 938
 939         size = 2 + 26 + 7 * n;
 940
 941         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
 942                 return;
 943
 944         skb->dev = dev;
 945         ptr = skb_put(skb, size);
 946
 947         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
 948         *ptr++ = 2; /* ECO */
 949         *ptr++ = 0;
 950         *ptr++ = 0;
 951         dn_dn2eth(ptr, ifa->ifa_local);
 952         src = ptr;
 953         ptr += ETH_ALEN;
 954         *ptr++ = dn_db->parms.forwarding == 1 ?
 955                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
 956         *((unsigned short *)ptr) = dn_htons(mtu2blksize(dev));
 957         ptr += 2;
 958         *ptr++ = dn_db->parms.priority; /* Priority */
 959         *ptr++ = 0; /* Area: Reserved */
 960         *((unsigned short *)ptr) = dn_htons((unsigned short)dn_db->parms.t3);
 961         ptr += 2;
 962         *ptr++ = 0; /* MPD: Reserved */
 963         i1 = ptr++;
 964         memset(ptr, 0, 7); /* Name: Reserved */
 965         ptr += 7;
 966         i2 = ptr++;
 967
 968         n = dn_neigh_elist(dev, ptr, n);
 969
 970         *i2 = 7 * n;
 971         *i1 = 8 + *i2;
 972
 973         skb_trim(skb, (27 + *i2));
 974
 975         pktlen = (unsigned short *)skb_push(skb, 2);
 976         *pktlen = dn_htons(skb->len - 2);
 977
 978         skb->nh.raw = skb->data;
 979
 980         if (dn_am_i_a_router(dn, dn_db, ifa)) {
 981                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
 982                 if (skb2) {
 983                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
 984                 }
 985         }
 986
 987         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
 988 }
 989
 990 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 991 {
 992         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 993
 994         if (dn_db->parms.forwarding == 0)
 995                 dn_send_endnode_hello(dev, ifa);
 996         else
 997                 dn_send_router_hello(dev, ifa);
 998 }
 999
1000 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1001 {
1002         int tdlen = 16;
1003         int size = dev->hard_header_len + 2 + 4 + tdlen;
1004         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1005         int i;
1006         unsigned char *ptr;
1007         char src[ETH_ALEN];
1008
1009         if (skb == NULL)
1010                 return ;
1011
1012         skb->dev = dev;
1013         skb_push(skb, dev->hard_header_len);
1014         ptr = skb_put(skb, 2 + 4 + tdlen);
1015
1016         *ptr++ = DN_RT_PKT_HELO;
1017         *((dn_address *)ptr) = ifa->ifa_local;
1018         ptr += 2;
1019         *ptr++ = tdlen;
1020
1021         for(i = 0; i < tdlen; i++)
1022                 *ptr++ = 0252;
1023
1024         dn_dn2eth(src, ifa->ifa_local);
1025         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1026 }
1027
1028 static int dn_eth_up(struct net_device *dev)
1029 {
1030         struct dn_dev *dn_db = dev->dn_ptr;
1031
1032         if (dn_db->parms.forwarding == 0)
1033                 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1034         else
1035                 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1036
1037         dev_mc_upload(dev);
1038
1039         dn_db->use_long = 1;
1040
1041         return 0;
1042 }
1043
1044 static void dn_eth_down(struct net_device *dev)
1045 {
1046         struct dn_dev *dn_db = dev->dn_ptr;
1047
1048         if (dn_db->parms.forwarding == 0)
1049                 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1050         else
1051                 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1052 }
1053
1054 static void dn_dev_set_timer(struct net_device *dev);
1055
1056 static void dn_dev_timer_func(unsigned long arg)
1057 {
1058         struct net_device *dev = (struct net_device *)arg;
1059         struct dn_dev *dn_db = dev->dn_ptr;
1060         struct dn_ifaddr *ifa;
1061
1062         if (dn_db->t3 <= dn_db->parms.t2) {
1063                 if (dn_db->parms.timer3) {
1064                         for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1065                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1066                                         dn_db->parms.timer3(dev, ifa);
1067                         }
1068                 }
1069                 dn_db->t3 = dn_db->parms.t3;
1070         } else {
1071                 dn_db->t3 -= dn_db->parms.t2;
1072         }
1073
1074         dn_dev_set_timer(dev);
1075 }
1076
1077 static void dn_dev_set_timer(struct net_device *dev)
1078 {
1079         struct dn_dev *dn_db = dev->dn_ptr;
1080
1081         if (dn_db->parms.t2 > dn_db->parms.t3)
1082                 dn_db->parms.t2 = dn_db->parms.t3;
1083
1084         dn_db->timer.data = (unsigned long)dev;
1085         dn_db->timer.function = dn_dev_timer_func;
1086         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1087
1088         add_timer(&dn_db->timer);
1089 }
1090
1091 struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1092 {
1093         int i;
1094         struct dn_dev_parms *p = dn_dev_list;
1095         struct dn_dev *dn_db;
1096
1097         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1098                 if (p->type == dev->type)
1099                         break;
1100         }
1101
1102         *err = -ENODEV;
1103         if (i == DN_DEV_LIST_SIZE)
1104                 return NULL;
1105
1106         *err = -ENOBUFS;
1107         if ((dn_db = kmalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1108                 return NULL;
1109
1110         memset(dn_db, 0, sizeof(struct dn_dev));
1111         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1112         smp_wmb();
1113         dev->dn_ptr = dn_db;
1114         dn_db->dev = dev;
1115         init_timer(&dn_db->timer);
1116
1117         dn_db->uptime = jiffies;
1118         if (dn_db->parms.up) {
1119                 if (dn_db->parms.up(dev) < 0) {
1120                         dev->dn_ptr = NULL;
1121                         kfree(dn_db);
1122                         return NULL;
1123                 }
1124         }
1125
1126         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1127
1128         dn_dev_sysctl_register(dev, &dn_db->parms);
1129
1130         dn_dev_set_timer(dev);
1131
1132         *err = 0;
1133         return dn_db;
1134 }
1135
1136
1137 /*
1138  * This processes a device up event. We only start up
1139  * the loopback device & ethernet devices with correct
1140  * MAC addreses automatically. Others must be started
1141  * specifically.
1142  *
1143  * FIXME: How should we configure the loopback address ? If we could dispense
1144  * with using decnet_address here and for autobind, it will be one less thing
1145  * for users to worry about setting up.
1146  */
1147
1148 void dn_dev_up(struct net_device *dev)
1149 {
1150         struct dn_ifaddr *ifa;
1151         dn_address addr = decnet_address;
1152         int maybe_default = 0;
1153         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1154
1155         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1156                 return;
1157
1158         /*
1159          * Need to ensure that loopback device has a dn_db attached to it
1160          * to allow creation of neighbours against it, even though it might
1161          * not have a local address of its own. Might as well do the same for
1162          * all autoconfigured interfaces.
1163          */
1164         if (dn_db == NULL) {
1165                 int err;
1166                 dn_db = dn_dev_create(dev, &err);
1167                 if (dn_db == NULL)
1168                         return;
1169         }
1170
1171         if (dev->type == ARPHRD_ETHER) {
1172                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1173                         return;
1174                 addr = dn_htons(dn_eth2dn(dev->dev_addr));
1175                 maybe_default = 1;
1176         }
1177
1178         if (addr == 0)
1179                 return;
1180
1181         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1182                 return;
1183
1184         ifa->ifa_local = ifa->ifa_address = addr;
1185         ifa->ifa_flags = 0;
1186         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1187         strcpy(ifa->ifa_label, dev->name);
1188
1189         dn_dev_set_ifa(dev, ifa);
1190
1191         /*
1192          * Automagically set the default device to the first automatically
1193          * configured ethernet card in the system.
1194          */
1195         if (maybe_default) {
1196                 dev_hold(dev);
1197                 if (dn_dev_set_default(dev, 0))
1198                         dev_put(dev);
1199         }
1200 }
1201
1202 static void dn_dev_delete(struct net_device *dev)
1203 {
1204         struct dn_dev *dn_db = dev->dn_ptr;
1205
1206         if (dn_db == NULL)
1207                 return;
1208
1209         del_timer_sync(&dn_db->timer);
1210         dn_dev_sysctl_unregister(&dn_db->parms);
1211         dn_dev_check_default(dev);
1212         neigh_ifdown(&dn_neigh_table, dev);
1213
1214         if (dn_db->parms.down)
1215                 dn_db->parms.down(dev);
1216
1217         dev->dn_ptr = NULL;
1218
1219         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1220         neigh_ifdown(&dn_neigh_table, dev);
1221
1222         if (dn_db->router)
1223                 neigh_release(dn_db->router);
1224         if (dn_db->peer)
1225                 neigh_release(dn_db->peer);
1226
1227         kfree(dn_db);
1228 }
1229
1230 void dn_dev_down(struct net_device *dev)
1231 {
1232         struct dn_dev *dn_db = dev->dn_ptr;
1233         struct dn_ifaddr *ifa;
1234
1235         if (dn_db == NULL)
1236                 return;
1237
1238         while((ifa = dn_db->ifa_list) != NULL) {
1239                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1240                 dn_dev_free_ifa(ifa);
1241         }
1242
1243         dn_dev_delete(dev);
1244 }
1245
1246 void dn_dev_init_pkt(struct sk_buff *skb)
1247 {
1248         return;
1249 }
1250
1251 void dn_dev_veri_pkt(struct sk_buff *skb)
1252 {
1253         return;
1254 }
1255
1256 void dn_dev_hello(struct sk_buff *skb)
1257 {
1258         return;
1259 }
1260
1261 void dn_dev_devices_off(void)
1262 {
1263         struct net_device *dev;
1264
1265         rtnl_lock();
1266         for(dev = dev_base; dev; dev = dev->next)
1267                 dn_dev_down(dev);
1268         rtnl_unlock();
1269
1270 }
1271
1272 void dn_dev_devices_on(void)
1273 {
1274         struct net_device *dev;
1275
1276         rtnl_lock();
1277         for(dev = dev_base; dev; dev = dev->next) {
1278                 if (dev->flags & IFF_UP)
1279                         dn_dev_up(dev);
1280         }
1281         rtnl_unlock();
1282 }
1283
1284 int register_dnaddr_notifier(struct notifier_block *nb)
1285 {
1286         return notifier_chain_register(&dnaddr_chain, nb);
1287 }
1288
1289 int unregister_dnaddr_notifier(struct notifier_block *nb)
1290 {
1291         return notifier_chain_unregister(&dnaddr_chain, nb);
1292 }
1293
1294 #ifdef CONFIG_PROC_FS
1295 static inline struct net_device *dn_dev_get_next(struct seq_file *seq, struct net_device *dev)
1296 {
1297         do {
1298                 dev = dev->next;
1299         } while(dev && !dev->dn_ptr);
1300
1301         return dev;
1302 }
1303
1304 static struct net_device *dn_dev_get_idx(struct seq_file *seq, loff_t pos)
1305 {
1306         struct net_device *dev;
1307
1308         dev = dev_base;
1309         if (dev && !dev->dn_ptr)
1310                 dev = dn_dev_get_next(seq, dev);
1311         if (pos) {
1312                 while(dev && (dev = dn_dev_get_next(seq, dev)))
1313                         --pos;
1314         }
1315         return dev;
1316 }
1317
1318 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1319 {
1320         if (*pos) {
1321                 struct net_device *dev;
1322                 read_lock(&dev_base_lock);
1323                 dev = dn_dev_get_idx(seq, *pos - 1);
1324                 if (dev == NULL)
1325                         read_unlock(&dev_base_lock);
1326                 return dev;
1327         }
1328         return SEQ_START_TOKEN;
1329 }
1330
1331 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1332 {
1333         struct net_device *dev = v;
1334         loff_t one = 1;
1335
1336         if (v == SEQ_START_TOKEN) {
1337                 dev = dn_dev_seq_start(seq, &one);
1338         } else {
1339                 dev = dn_dev_get_next(seq, dev);
1340                 if (dev == NULL)
1341                         read_unlock(&dev_base_lock);
1342         }
1343         ++*pos;
1344         return dev;
1345 }
1346
1347 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1348 {
1349         if (v && v != SEQ_START_TOKEN)
1350                 read_unlock(&dev_base_lock);
1351 }
1352
1353 static char *dn_type2asc(char type)
1354 {
1355         switch(type) {
1356                 case DN_DEV_BCAST:
1357                         return "B";
1358                 case DN_DEV_UCAST:
1359                         return "U";
1360                 case DN_DEV_MPOINT:
1361                         return "M";
1362         }
1363
1364         return "?";
1365 }
1366
1367 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1368 {
1369         if (v == SEQ_START_TOKEN)
1370                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1371         else {
1372                 struct net_device *dev = v;
1373                 char peer_buf[DN_ASCBUF_LEN];
1374                 char router_buf[DN_ASCBUF_LEN];
1375                 struct dn_dev *dn_db = dev->dn_ptr;
1376
1377                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1378                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1379                                 dev->name ? dev->name : "???",
1380                                 dn_type2asc(dn_db->parms.mode),
1381                                 0, 0,
1382                                 dn_db->t3, dn_db->parms.t3,
1383                                 mtu2blksize(dev),
1384                                 dn_db->parms.priority,
1385                                 dn_db->parms.state, dn_db->parms.name,
1386                                 dn_db->router ? dn_addr2asc(dn_ntohs(*(dn_address *)dn_db->router->primary_key), router_buf) : "",
1387                                 dn_db->peer ? dn_addr2asc(dn_ntohs(*(dn_address *)dn_db->peer->primary_key), peer_buf) : "");
1388         }
1389         return 0;
1390 }
1391
1392 static struct seq_operations dn_dev_seq_ops = {
1393         .start  = dn_dev_seq_start,
1394         .next   = dn_dev_seq_next,
1395         .stop   = dn_dev_seq_stop,
1396         .show   = dn_dev_seq_show,
1397 };
1398
1399 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1400 {
1401         return seq_open(file, &dn_dev_seq_ops);
1402 }
1403
1404 static struct file_operations dn_dev_seq_fops = {
1405         .owner   = THIS_MODULE,
1406         .open    = dn_dev_seq_open,
1407         .read    = seq_read,
1408         .llseek  = seq_lseek,
1409         .release = seq_release,
1410 };
1411
1412 #endif /* CONFIG_PROC_FS */
1413
1414 static struct rtnetlink_link dnet_rtnetlink_table[RTM_NR_MSGTYPES] =
1415 {
1416         [RTM_NEWADDR  - RTM_BASE] = { .doit     = dn_dev_rtm_newaddr,   },
1417         [RTM_DELADDR  - RTM_BASE] = { .doit     = dn_dev_rtm_deladdr,   },
1418         [RTM_GETADDR  - RTM_BASE] = { .dumpit   = dn_dev_dump_ifaddr,   },
1419 #ifdef CONFIG_DECNET_ROUTER
1420         [RTM_NEWROUTE - RTM_BASE] = { .doit     = dn_fib_rtm_newroute,  },
1421         [RTM_DELROUTE - RTM_BASE] = { .doit     = dn_fib_rtm_delroute,  },
1422         [RTM_GETROUTE - RTM_BASE] = { .doit     = dn_cache_getroute,
1423                                       .dumpit   = dn_fib_dump,          },
1424         [RTM_NEWRULE  - RTM_BASE] = { .doit     = dn_fib_rtm_newrule,   },
1425         [RTM_DELRULE  - RTM_BASE] = { .doit     = dn_fib_rtm_delrule,   },
1426         [RTM_GETRULE  - RTM_BASE] = { .dumpit   = dn_fib_dump_rules,    },
1427 #else
1428         [RTM_GETROUTE - RTM_BASE] = { .doit     = dn_cache_getroute,
1429                                       .dumpit   = dn_cache_dump,        },
1430 #endif
1431
1432 };
1433
1434 static int __initdata addr[2];
1435 module_param_array(addr, int, NULL, 0444);
1436 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1437
1438 void __init dn_dev_init(void)
1439 {
1440         if (addr[0] > 63 || addr[0] < 0) {
1441                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1442                 return;
1443         }
1444
1445         if (addr[1] > 1023 || addr[1] < 0) {
1446                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1447                 return;
1448         }
1449
1450         decnet_address = dn_htons((addr[0] << 10) | addr[1]);
1451
1452         dn_dev_devices_on();
1453
1454         rtnetlink_links[PF_DECnet] = dnet_rtnetlink_table;
1455
1456         proc_net_fops_create("decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1457
1458 #ifdef CONFIG_SYSCTL
1459         {
1460                 int i;
1461                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1462                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1463         }
1464 #endif /* CONFIG_SYSCTL */
1465 }
1466
1467 void __exit dn_dev_cleanup(void)
1468 {
1469         rtnetlink_links[PF_DECnet] = NULL;
1470
1471 #ifdef CONFIG_SYSCTL
1472         {
1473                 int i;
1474                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1475                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1476         }
1477 #endif /* CONFIG_SYSCTL */
1478
1479         proc_net_remove("decnet_dev");
1480
1481         dn_dev_devices_off();
1482 }