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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/net_namespace.h>
  46 #include <net/neighbour.h>
  47 #include <net/dst.h>
  48 #include <net/flow.h>
  49 #include <net/fib_rules.h>
  50 #include <net/netlink.h>
  51 #include <net/dn.h>
  52 #include <net/dn_dev.h>
  53 #include <net/dn_route.h>
  54 #include <net/dn_neigh.h>
  55 #include <net/dn_fib.h>
  56
  57 #define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
  58
  59 static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
  60 static char dn_rt_all_rt_mcast[ETH_ALEN]  = {0xAB,0x00,0x00,0x03,0x00,0x00};
  61 static char dn_hiord[ETH_ALEN]            = {0xAA,0x00,0x04,0x00,0x00,0x00};
  62 static unsigned char dn_eco_version[3]    = {0x02,0x00,0x00};
  63
  64 extern struct neigh_table dn_neigh_table;
  65
  66 /*
  67  * decnet_address is kept in network order.
  68  */
  69 __le16 decnet_address = 0;
  70
  71 static DEFINE_RWLOCK(dndev_lock);
  72 static struct net_device *decnet_default_device;
  73 static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
  74
  75 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
  76 static void dn_dev_delete(struct net_device *dev);
  77 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
  78
  79 static int dn_eth_up(struct net_device *);
  80 static void dn_eth_down(struct net_device *);
  81 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  82 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  83
  84 static struct dn_dev_parms dn_dev_list[] =  {
  85 {
  86         .type =         ARPHRD_ETHER, /* Ethernet */
  87         .mode =         DN_DEV_BCAST,
  88         .state =        DN_DEV_S_RU,
  89         .t2 =           1,
  90         .t3 =           10,
  91         .name =         "ethernet",
  92         .ctl_name =     NET_DECNET_CONF_ETHER,
  93         .up =           dn_eth_up,
  94         .down =         dn_eth_down,
  95         .timer3 =       dn_send_brd_hello,
  96 },
  97 {
  98         .type =         ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
  99         .mode =         DN_DEV_BCAST,
 100         .state =        DN_DEV_S_RU,
 101         .t2 =           1,
 102         .t3 =           10,
 103         .name =         "ipgre",
 104         .ctl_name =     NET_DECNET_CONF_GRE,
 105         .timer3 =       dn_send_brd_hello,
 106 },
 107 #if 0
 108 {
 109         .type =         ARPHRD_X25, /* Bog standard X.25 */
 110         .mode =         DN_DEV_UCAST,
 111         .state =        DN_DEV_S_DS,
 112         .t2 =           1,
 113         .t3 =           120,
 114         .name =         "x25",
 115         .ctl_name =     NET_DECNET_CONF_X25,
 116         .timer3 =       dn_send_ptp_hello,
 117 },
 118 #endif
 119 #if 0
 120 {
 121         .type =         ARPHRD_PPP, /* DECnet over PPP */
 122         .mode =         DN_DEV_BCAST,
 123         .state =        DN_DEV_S_RU,
 124         .t2 =           1,
 125         .t3 =           10,
 126         .name =         "ppp",
 127         .ctl_name =     NET_DECNET_CONF_PPP,
 128         .timer3 =       dn_send_brd_hello,
 129 },
 130 #endif
 131 {
 132         .type =         ARPHRD_DDCMP, /* DECnet over DDCMP */
 133         .mode =         DN_DEV_UCAST,
 134         .state =        DN_DEV_S_DS,
 135         .t2 =           1,
 136         .t3 =           120,
 137         .name =         "ddcmp",
 138         .ctl_name =     NET_DECNET_CONF_DDCMP,
 139         .timer3 =       dn_send_ptp_hello,
 140 },
 141 {
 142         .type =         ARPHRD_LOOPBACK, /* Loopback interface - always last */
 143         .mode =         DN_DEV_BCAST,
 144         .state =        DN_DEV_S_RU,
 145         .t2 =           1,
 146         .t3 =           10,
 147         .name =         "loopback",
 148         .ctl_name =     NET_DECNET_CONF_LOOPBACK,
 149         .timer3 =       dn_send_brd_hello,
 150 }
 151 };
 152
 153 #define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
 154
 155 #define DN_DEV_PARMS_OFFSET(x) ((int) ((char *) &((struct dn_dev_parms *)0)->x))
 156
 157 #ifdef CONFIG_SYSCTL
 158
 159 static int min_t2[] = { 1 };
 160 static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
 161 static int min_t3[] = { 1 };
 162 static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
 163
 164 static int min_priority[1];
 165 static int max_priority[] = { 127 }; /* From DECnet spec */
 166
 167 static int dn_forwarding_proc(ctl_table *, int, struct file *,
 168                         void __user *, size_t *, loff_t *);
 169 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
 170                         void __user *oldval, size_t __user *oldlenp,
 171                         void __user *newval, size_t newlen);
 172
 173 static struct dn_dev_sysctl_table {
 174         struct ctl_table_header *sysctl_header;
 175         ctl_table dn_dev_vars[5];
 176         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         }
 266
 267         if (dev) {
 268                 t->dn_dev_dev[0].procname = dev->name;
 269                 t->dn_dev_dev[0].ctl_name = dev->ifindex;
 270         } else {
 271                 t->dn_dev_dev[0].procname = parms->name;
 272                 t->dn_dev_dev[0].ctl_name = parms->ctl_name;
 273         }
 274
 275         t->dn_dev_dev[0].child = t->dn_dev_vars;
 276         t->dn_dev_conf_dir[0].child = t->dn_dev_dev;
 277         t->dn_dev_proto_dir[0].child = t->dn_dev_conf_dir;
 278         t->dn_dev_root_dir[0].child = t->dn_dev_proto_dir;
 279         t->dn_dev_vars[0].extra1 = (void *)dev;
 280
 281         t->sysctl_header = register_sysctl_table(t->dn_dev_root_dir);
 282         if (t->sysctl_header == NULL)
 283                 kfree(t);
 284         else
 285                 parms->sysctl = t;
 286 }
 287
 288 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 289 {
 290         if (parms->sysctl) {
 291                 struct dn_dev_sysctl_table *t = parms->sysctl;
 292                 parms->sysctl = NULL;
 293                 unregister_sysctl_table(t->sysctl_header);
 294                 kfree(t);
 295         }
 296 }
 297
 298 static int dn_forwarding_proc(ctl_table *table, int write,
 299                                 struct file *filep,
 300                                 void __user *buffer,
 301                                 size_t *lenp, loff_t *ppos)
 302 {
 303 #ifdef CONFIG_DECNET_ROUTER
 304         struct net_device *dev = table->extra1;
 305         struct dn_dev *dn_db;
 306         int err;
 307         int tmp, old;
 308
 309         if (table->extra1 == NULL)
 310                 return -EINVAL;
 311
 312         dn_db = dev->dn_ptr;
 313         old = dn_db->parms.forwarding;
 314
 315         err = proc_dointvec(table, write, filep, buffer, lenp, ppos);
 316
 317         if ((err >= 0) && write) {
 318                 if (dn_db->parms.forwarding < 0)
 319                         dn_db->parms.forwarding = 0;
 320                 if (dn_db->parms.forwarding > 2)
 321                         dn_db->parms.forwarding = 2;
 322                 /*
 323                  * What an ugly hack this is... its works, just. It
 324                  * would be nice if sysctl/proc were just that little
 325                  * bit more flexible so I don't have to write a special
 326                  * routine, or suffer hacks like this - SJW
 327                  */
 328                 tmp = dn_db->parms.forwarding;
 329                 dn_db->parms.forwarding = old;
 330                 if (dn_db->parms.down)
 331                         dn_db->parms.down(dev);
 332                 dn_db->parms.forwarding = tmp;
 333                 if (dn_db->parms.up)
 334                         dn_db->parms.up(dev);
 335         }
 336
 337         return err;
 338 #else
 339         return -EINVAL;
 340 #endif
 341 }
 342
 343 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
 344                         void __user *oldval, size_t __user *oldlenp,
 345                         void __user *newval, size_t newlen)
 346 {
 347 #ifdef CONFIG_DECNET_ROUTER
 348         struct net_device *dev = table->extra1;
 349         struct dn_dev *dn_db;
 350         int value;
 351
 352         if (table->extra1 == NULL)
 353                 return -EINVAL;
 354
 355         dn_db = dev->dn_ptr;
 356
 357         if (newval && newlen) {
 358                 if (newlen != sizeof(int))
 359                         return -EINVAL;
 360
 361                 if (get_user(value, (int __user *)newval))
 362                         return -EFAULT;
 363                 if (value < 0)
 364                         return -EINVAL;
 365                 if (value > 2)
 366                         return -EINVAL;
 367
 368                 if (dn_db->parms.down)
 369                         dn_db->parms.down(dev);
 370                 dn_db->parms.forwarding = value;
 371                 if (dn_db->parms.up)
 372                         dn_db->parms.up(dev);
 373         }
 374
 375         return 0;
 376 #else
 377         return -EINVAL;
 378 #endif
 379 }
 380
 381 #else /* CONFIG_SYSCTL */
 382 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 383 {
 384 }
 385 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 386 {
 387 }
 388
 389 #endif /* CONFIG_SYSCTL */
 390
 391 static inline __u16 mtu2blksize(struct net_device *dev)
 392 {
 393         u32 blksize = dev->mtu;
 394         if (blksize > 0xffff)
 395                 blksize = 0xffff;
 396
 397         if (dev->type == ARPHRD_ETHER ||
 398             dev->type == ARPHRD_PPP ||
 399             dev->type == ARPHRD_IPGRE ||
 400             dev->type == ARPHRD_LOOPBACK)
 401                 blksize -= 2;
 402
 403         return (__u16)blksize;
 404 }
 405
 406 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
 407 {
 408         struct dn_ifaddr *ifa;
 409
 410         ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
 411
 412         return ifa;
 413 }
 414
 415 static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
 416 {
 417         kfree(ifa);
 418 }
 419
 420 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
 421 {
 422         struct dn_ifaddr *ifa1 = *ifap;
 423         unsigned char mac_addr[6];
 424         struct net_device *dev = dn_db->dev;
 425
 426         ASSERT_RTNL();
 427
 428         *ifap = ifa1->ifa_next;
 429
 430         if (dn_db->dev->type == ARPHRD_ETHER) {
 431                 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
 432                         dn_dn2eth(mac_addr, ifa1->ifa_local);
 433                         dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
 434                 }
 435         }
 436
 437         dn_ifaddr_notify(RTM_DELADDR, ifa1);
 438         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
 439         if (destroy) {
 440                 dn_dev_free_ifa(ifa1);
 441
 442                 if (dn_db->ifa_list == NULL)
 443                         dn_dev_delete(dn_db->dev);
 444         }
 445 }
 446
 447 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 448 {
 449         struct net_device *dev = dn_db->dev;
 450         struct dn_ifaddr *ifa1;
 451         unsigned char mac_addr[6];
 452
 453         ASSERT_RTNL();
 454
 455         /* Check for duplicates */
 456         for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
 457                 if (ifa1->ifa_local == ifa->ifa_local)
 458                         return -EEXIST;
 459         }
 460
 461         if (dev->type == ARPHRD_ETHER) {
 462                 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
 463                         dn_dn2eth(mac_addr, ifa->ifa_local);
 464                         dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
 465                 }
 466         }
 467
 468         ifa->ifa_next = dn_db->ifa_list;
 469         dn_db->ifa_list = ifa;
 470
 471         dn_ifaddr_notify(RTM_NEWADDR, ifa);
 472         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
 473
 474         return 0;
 475 }
 476
 477 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
 478 {
 479         struct dn_dev *dn_db = dev->dn_ptr;
 480         int rv;
 481
 482         if (dn_db == NULL) {
 483                 int err;
 484                 dn_db = dn_dev_create(dev, &err);
 485                 if (dn_db == NULL)
 486                         return err;
 487         }
 488
 489         ifa->ifa_dev = dn_db;
 490
 491         if (dev->flags & IFF_LOOPBACK)
 492                 ifa->ifa_scope = RT_SCOPE_HOST;
 493
 494         rv = dn_dev_insert_ifa(dn_db, ifa);
 495         if (rv)
 496                 dn_dev_free_ifa(ifa);
 497         return rv;
 498 }
 499
 500
 501 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
 502 {
 503         char buffer[DN_IFREQ_SIZE];
 504         struct ifreq *ifr = (struct ifreq *)buffer;
 505         struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
 506         struct dn_dev *dn_db;
 507         struct net_device *dev;
 508         struct dn_ifaddr *ifa = NULL, **ifap = NULL;
 509         int ret = 0;
 510
 511         if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
 512                 return -EFAULT;
 513         ifr->ifr_name[IFNAMSIZ-1] = 0;
 514
 515 #ifdef CONFIG_KMOD
 516         dev_load(&init_net, ifr->ifr_name);
 517 #endif
 518
 519         switch(cmd) {
 520                 case SIOCGIFADDR:
 521                         break;
 522                 case SIOCSIFADDR:
 523                         if (!capable(CAP_NET_ADMIN))
 524                                 return -EACCES;
 525                         if (sdn->sdn_family != AF_DECnet)
 526                                 return -EINVAL;
 527                         break;
 528                 default:
 529                         return -EINVAL;
 530         }
 531
 532         rtnl_lock();
 533
 534         if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
 535                 ret = -ENODEV;
 536                 goto done;
 537         }
 538
 539         if ((dn_db = dev->dn_ptr) != NULL) {
 540                 for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
 541                         if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
 542                                 break;
 543         }
 544
 545         if (ifa == NULL && cmd != SIOCSIFADDR) {
 546                 ret = -EADDRNOTAVAIL;
 547                 goto done;
 548         }
 549
 550         switch(cmd) {
 551                 case SIOCGIFADDR:
 552                         *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
 553                         goto rarok;
 554
 555                 case SIOCSIFADDR:
 556                         if (!ifa) {
 557                                 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
 558                                         ret = -ENOBUFS;
 559                                         break;
 560                                 }
 561                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 562                         } else {
 563                                 if (ifa->ifa_local == dn_saddr2dn(sdn))
 564                                         break;
 565                                 dn_dev_del_ifa(dn_db, ifap, 0);
 566                         }
 567
 568                         ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
 569
 570                         ret = dn_dev_set_ifa(dev, ifa);
 571         }
 572 done:
 573         rtnl_unlock();
 574
 575         return ret;
 576 rarok:
 577         if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
 578                 ret = -EFAULT;
 579         goto done;
 580 }
 581
 582 struct net_device *dn_dev_get_default(void)
 583 {
 584         struct net_device *dev;
 585         read_lock(&dndev_lock);
 586         dev = decnet_default_device;
 587         if (dev) {
 588                 if (dev->dn_ptr)
 589                         dev_hold(dev);
 590                 else
 591                         dev = NULL;
 592         }
 593         read_unlock(&dndev_lock);
 594         return dev;
 595 }
 596
 597 int dn_dev_set_default(struct net_device *dev, int force)
 598 {
 599         struct net_device *old = NULL;
 600         int rv = -EBUSY;
 601         if (!dev->dn_ptr)
 602                 return -ENODEV;
 603         write_lock(&dndev_lock);
 604         if (force || decnet_default_device == NULL) {
 605                 old = decnet_default_device;
 606                 decnet_default_device = dev;
 607                 rv = 0;
 608         }
 609         write_unlock(&dndev_lock);
 610         if (old)
 611                 dev_put(old);
 612         return rv;
 613 }
 614
 615 static void dn_dev_check_default(struct net_device *dev)
 616 {
 617         write_lock(&dndev_lock);
 618         if (dev == decnet_default_device) {
 619                 decnet_default_device = NULL;
 620         } else {
 621                 dev = NULL;
 622         }
 623         write_unlock(&dndev_lock);
 624         if (dev)
 625                 dev_put(dev);
 626 }
 627
 628 static struct dn_dev *dn_dev_by_index(int ifindex)
 629 {
 630         struct net_device *dev;
 631         struct dn_dev *dn_dev = NULL;
 632         dev = dev_get_by_index(&init_net, ifindex);
 633         if (dev) {
 634                 dn_dev = dev->dn_ptr;
 635                 dev_put(dev);
 636         }
 637
 638         return dn_dev;
 639 }
 640
 641 static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
 642         [IFA_ADDRESS]           = { .type = NLA_U16 },
 643         [IFA_LOCAL]             = { .type = NLA_U16 },
 644         [IFA_LABEL]             = { .type = NLA_STRING,
 645                                     .len = IFNAMSIZ - 1 },
 646 };
 647
 648 static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 649 {
 650         struct nlattr *tb[IFA_MAX+1];
 651         struct dn_dev *dn_db;
 652         struct ifaddrmsg *ifm;
 653         struct dn_ifaddr *ifa, **ifap;
 654         int err = -EADDRNOTAVAIL;
 655
 656         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
 657         if (err < 0)
 658                 goto errout;
 659
 660         ifm = nlmsg_data(nlh);
 661         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
 662                 goto errout;
 663
 664         for (ifap = &dn_db->ifa_list; (ifa = *ifap); ifap = &ifa->ifa_next) {
 665                 if (tb[IFA_LOCAL] &&
 666                     nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
 667                         continue;
 668
 669                 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
 670                         continue;
 671
 672                 dn_dev_del_ifa(dn_db, ifap, 1);
 673                 return 0;
 674         }
 675
 676 errout:
 677         return err;
 678 }
 679
 680 static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 681 {
 682         struct nlattr *tb[IFA_MAX+1];
 683         struct net_device *dev;
 684         struct dn_dev *dn_db;
 685         struct ifaddrmsg *ifm;
 686         struct dn_ifaddr *ifa;
 687         int err;
 688
 689         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
 690         if (err < 0)
 691                 return err;
 692
 693         if (tb[IFA_LOCAL] == NULL)
 694                 return -EINVAL;
 695
 696         ifm = nlmsg_data(nlh);
 697         if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
 698                 return -ENODEV;
 699
 700         if ((dn_db = dev->dn_ptr) == NULL) {
 701                 int err;
 702                 dn_db = dn_dev_create(dev, &err);
 703                 if (!dn_db)
 704                         return err;
 705         }
 706
 707         if ((ifa = dn_dev_alloc_ifa()) == NULL)
 708                 return -ENOBUFS;
 709
 710         if (tb[IFA_ADDRESS] == NULL)
 711                 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
 712
 713         ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
 714         ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
 715         ifa->ifa_flags = ifm->ifa_flags;
 716         ifa->ifa_scope = ifm->ifa_scope;
 717         ifa->ifa_dev = dn_db;
 718
 719         if (tb[IFA_LABEL])
 720                 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
 721         else
 722                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 723
 724         err = dn_dev_insert_ifa(dn_db, ifa);
 725         if (err)
 726                 dn_dev_free_ifa(ifa);
 727
 728         return err;
 729 }
 730
 731 static inline size_t dn_ifaddr_nlmsg_size(void)
 732 {
 733         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
 734                + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
 735                + nla_total_size(2) /* IFA_ADDRESS */
 736                + nla_total_size(2); /* IFA_LOCAL */
 737 }
 738
 739 static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
 740                              u32 pid, u32 seq, int event, unsigned int flags)
 741 {
 742         struct ifaddrmsg *ifm;
 743         struct nlmsghdr *nlh;
 744
 745         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
 746         if (nlh == NULL)
 747                 return -EMSGSIZE;
 748
 749         ifm = nlmsg_data(nlh);
 750         ifm->ifa_family = AF_DECnet;
 751         ifm->ifa_prefixlen = 16;
 752         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
 753         ifm->ifa_scope = ifa->ifa_scope;
 754         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
 755
 756         if (ifa->ifa_address)
 757                 NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
 758         if (ifa->ifa_local)
 759                 NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
 760         if (ifa->ifa_label[0])
 761                 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
 762
 763         return nlmsg_end(skb, nlh);
 764
 765 nla_put_failure:
 766         nlmsg_cancel(skb, nlh);
 767         return -EMSGSIZE;
 768 }
 769
 770 static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
 771 {
 772         struct sk_buff *skb;
 773         int err = -ENOBUFS;
 774
 775         skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
 776         if (skb == NULL)
 777                 goto errout;
 778
 779         err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
 780         if (err < 0) {
 781                 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
 782                 WARN_ON(err == -EMSGSIZE);
 783                 kfree_skb(skb);
 784                 goto errout;
 785         }
 786         err = rtnl_notify(skb, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
 787 errout:
 788         if (err < 0)
 789                 rtnl_set_sk_err(RTNLGRP_DECnet_IFADDR, err);
 790 }
 791
 792 static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 793 {
 794         int idx, dn_idx = 0, skip_ndevs, skip_naddr;
 795         struct net_device *dev;
 796         struct dn_dev *dn_db;
 797         struct dn_ifaddr *ifa;
 798
 799         skip_ndevs = cb->args[0];
 800         skip_naddr = cb->args[1];
 801
 802         idx = 0;
 803         for_each_netdev(&init_net, dev) {
 804                 if (idx < skip_ndevs)
 805                         goto cont;
 806                 else if (idx > skip_ndevs) {
 807                         /* Only skip over addresses for first dev dumped
 808                          * in this iteration (idx == skip_ndevs) */
 809                         skip_naddr = 0;
 810                 }
 811
 812                 if ((dn_db = dev->dn_ptr) == NULL)
 813                         goto cont;
 814
 815                 for (ifa = dn_db->ifa_list, dn_idx = 0; ifa;
 816                      ifa = ifa->ifa_next, dn_idx++) {
 817                         if (dn_idx < skip_naddr)
 818                                 continue;
 819
 820                         if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
 821                                               cb->nlh->nlmsg_seq, RTM_NEWADDR,
 822                                               NLM_F_MULTI) < 0)
 823                                 goto done;
 824                 }
 825 cont:
 826                 idx++;
 827         }
 828 done:
 829         cb->args[0] = idx;
 830         cb->args[1] = dn_idx;
 831
 832         return skb->len;
 833 }
 834
 835 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
 836 {
 837         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 838         struct dn_ifaddr *ifa;
 839         int rv = -ENODEV;
 840         if (dn_db == NULL)
 841                 goto out;
 842         ifa = dn_db->ifa_list;
 843         if (ifa != NULL) {
 844                 *addr = ifa->ifa_local;
 845                 rv = 0;
 846         }
 847 out:
 848         return rv;
 849 }
 850
 851 /*
 852  * Find a default address to bind to.
 853  *
 854  * This is one of those areas where the initial VMS concepts don't really
 855  * map onto the Linux concepts, and since we introduced multiple addresses
 856  * per interface we have to cope with slightly odd ways of finding out what
 857  * "our address" really is. Mostly it's not a problem; for this we just guess
 858  * a sensible default. Eventually the routing code will take care of all the
 859  * nasties for us I hope.
 860  */
 861 int dn_dev_bind_default(__le16 *addr)
 862 {
 863         struct net_device *dev;
 864         int rv;
 865         dev = dn_dev_get_default();
 866 last_chance:
 867         if (dev) {
 868                 read_lock(&dev_base_lock);
 869                 rv = dn_dev_get_first(dev, addr);
 870                 read_unlock(&dev_base_lock);
 871                 dev_put(dev);
 872                 if (rv == 0 || dev == init_net.loopback_dev)
 873                         return rv;
 874         }
 875         dev = init_net.loopback_dev;
 876         dev_hold(dev);
 877         goto last_chance;
 878 }
 879
 880 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 881 {
 882         struct endnode_hello_message *msg;
 883         struct sk_buff *skb = NULL;
 884         __le16 *pktlen;
 885         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 886
 887         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
 888                 return;
 889
 890         skb->dev = dev;
 891
 892         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
 893
 894         msg->msgflg  = 0x0D;
 895         memcpy(msg->tiver, dn_eco_version, 3);
 896         dn_dn2eth(msg->id, ifa->ifa_local);
 897         msg->iinfo   = DN_RT_INFO_ENDN;
 898         msg->blksize = dn_htons(mtu2blksize(dev));
 899         msg->area    = 0x00;
 900         memset(msg->seed, 0, 8);
 901         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
 902
 903         if (dn_db->router) {
 904                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 905                 dn_dn2eth(msg->neighbor, dn->addr);
 906         }
 907
 908         msg->timer   = dn_htons((unsigned short)dn_db->parms.t3);
 909         msg->mpd     = 0x00;
 910         msg->datalen = 0x02;
 911         memset(msg->data, 0xAA, 2);
 912
 913         pktlen = (__le16 *)skb_push(skb,2);
 914         *pktlen = dn_htons(skb->len - 2);
 915
 916         skb_reset_network_header(skb);
 917
 918         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
 919 }
 920
 921
 922 #define DRDELAY (5 * HZ)
 923
 924 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 925 {
 926         /* First check time since device went up */
 927         if ((jiffies - dn_db->uptime) < DRDELAY)
 928                 return 0;
 929
 930         /* If there is no router, then yes... */
 931         if (!dn_db->router)
 932                 return 1;
 933
 934         /* otherwise only if we have a higher priority or.. */
 935         if (dn->priority < dn_db->parms.priority)
 936                 return 1;
 937
 938         /* if we have equal priority and a higher node number */
 939         if (dn->priority != dn_db->parms.priority)
 940                 return 0;
 941
 942         if (dn_ntohs(dn->addr) < dn_ntohs(ifa->ifa_local))
 943                 return 1;
 944
 945         return 0;
 946 }
 947
 948 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 949 {
 950         int n;
 951         struct dn_dev *dn_db = dev->dn_ptr;
 952         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 953         struct sk_buff *skb;
 954         size_t size;
 955         unsigned char *ptr;
 956         unsigned char *i1, *i2;
 957         __le16 *pktlen;
 958         char *src;
 959
 960         if (mtu2blksize(dev) < (26 + 7))
 961                 return;
 962
 963         n = mtu2blksize(dev) - 26;
 964         n /= 7;
 965
 966         if (n > 32)
 967                 n = 32;
 968
 969         size = 2 + 26 + 7 * n;
 970
 971         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
 972                 return;
 973
 974         skb->dev = dev;
 975         ptr = skb_put(skb, size);
 976
 977         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
 978         *ptr++ = 2; /* ECO */
 979         *ptr++ = 0;
 980         *ptr++ = 0;
 981         dn_dn2eth(ptr, ifa->ifa_local);
 982         src = ptr;
 983         ptr += ETH_ALEN;
 984         *ptr++ = dn_db->parms.forwarding == 1 ?
 985                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
 986         *((__le16 *)ptr) = dn_htons(mtu2blksize(dev));
 987         ptr += 2;
 988         *ptr++ = dn_db->parms.priority; /* Priority */
 989         *ptr++ = 0; /* Area: Reserved */
 990         *((__le16 *)ptr) = dn_htons((unsigned short)dn_db->parms.t3);
 991         ptr += 2;
 992         *ptr++ = 0; /* MPD: Reserved */
 993         i1 = ptr++;
 994         memset(ptr, 0, 7); /* Name: Reserved */
 995         ptr += 7;
 996         i2 = ptr++;
 997
 998         n = dn_neigh_elist(dev, ptr, n);
 999
1000         *i2 = 7 * n;
1001         *i1 = 8 + *i2;
1002
1003         skb_trim(skb, (27 + *i2));
1004
1005         pktlen = (__le16 *)skb_push(skb, 2);
1006         *pktlen = dn_htons(skb->len - 2);
1007
1008         skb_reset_network_header(skb);
1009
1010         if (dn_am_i_a_router(dn, dn_db, ifa)) {
1011                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
1012                 if (skb2) {
1013                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
1014                 }
1015         }
1016
1017         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1018 }
1019
1020 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1021 {
1022         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1023
1024         if (dn_db->parms.forwarding == 0)
1025                 dn_send_endnode_hello(dev, ifa);
1026         else
1027                 dn_send_router_hello(dev, ifa);
1028 }
1029
1030 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1031 {
1032         int tdlen = 16;
1033         int size = dev->hard_header_len + 2 + 4 + tdlen;
1034         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1035         int i;
1036         unsigned char *ptr;
1037         char src[ETH_ALEN];
1038
1039         if (skb == NULL)
1040                 return ;
1041
1042         skb->dev = dev;
1043         skb_push(skb, dev->hard_header_len);
1044         ptr = skb_put(skb, 2 + 4 + tdlen);
1045
1046         *ptr++ = DN_RT_PKT_HELO;
1047         *((__le16 *)ptr) = ifa->ifa_local;
1048         ptr += 2;
1049         *ptr++ = tdlen;
1050
1051         for(i = 0; i < tdlen; i++)
1052                 *ptr++ = 0252;
1053
1054         dn_dn2eth(src, ifa->ifa_local);
1055         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1056 }
1057
1058 static int dn_eth_up(struct net_device *dev)
1059 {
1060         struct dn_dev *dn_db = dev->dn_ptr;
1061
1062         if (dn_db->parms.forwarding == 0)
1063                 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1064         else
1065                 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1066
1067         dn_db->use_long = 1;
1068
1069         return 0;
1070 }
1071
1072 static void dn_eth_down(struct net_device *dev)
1073 {
1074         struct dn_dev *dn_db = dev->dn_ptr;
1075
1076         if (dn_db->parms.forwarding == 0)
1077                 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1078         else
1079                 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1080 }
1081
1082 static void dn_dev_set_timer(struct net_device *dev);
1083
1084 static void dn_dev_timer_func(unsigned long arg)
1085 {
1086         struct net_device *dev = (struct net_device *)arg;
1087         struct dn_dev *dn_db = dev->dn_ptr;
1088         struct dn_ifaddr *ifa;
1089
1090         if (dn_db->t3 <= dn_db->parms.t2) {
1091                 if (dn_db->parms.timer3) {
1092                         for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1093                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1094                                         dn_db->parms.timer3(dev, ifa);
1095                         }
1096                 }
1097                 dn_db->t3 = dn_db->parms.t3;
1098         } else {
1099                 dn_db->t3 -= dn_db->parms.t2;
1100         }
1101
1102         dn_dev_set_timer(dev);
1103 }
1104
1105 static void dn_dev_set_timer(struct net_device *dev)
1106 {
1107         struct dn_dev *dn_db = dev->dn_ptr;
1108
1109         if (dn_db->parms.t2 > dn_db->parms.t3)
1110                 dn_db->parms.t2 = dn_db->parms.t3;
1111
1112         dn_db->timer.data = (unsigned long)dev;
1113         dn_db->timer.function = dn_dev_timer_func;
1114         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1115
1116         add_timer(&dn_db->timer);
1117 }
1118
1119 struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1120 {
1121         int i;
1122         struct dn_dev_parms *p = dn_dev_list;
1123         struct dn_dev *dn_db;
1124
1125         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1126                 if (p->type == dev->type)
1127                         break;
1128         }
1129
1130         *err = -ENODEV;
1131         if (i == DN_DEV_LIST_SIZE)
1132                 return NULL;
1133
1134         *err = -ENOBUFS;
1135         if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1136                 return NULL;
1137
1138         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1139         smp_wmb();
1140         dev->dn_ptr = dn_db;
1141         dn_db->dev = dev;
1142         init_timer(&dn_db->timer);
1143
1144         dn_db->uptime = jiffies;
1145
1146         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1147         if (!dn_db->neigh_parms) {
1148                 dev->dn_ptr = NULL;
1149                 kfree(dn_db);
1150                 return NULL;
1151         }
1152
1153         if (dn_db->parms.up) {
1154                 if (dn_db->parms.up(dev) < 0) {
1155                         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1156                         dev->dn_ptr = NULL;
1157                         kfree(dn_db);
1158                         return NULL;
1159                 }
1160         }
1161
1162         dn_dev_sysctl_register(dev, &dn_db->parms);
1163
1164         dn_dev_set_timer(dev);
1165
1166         *err = 0;
1167         return dn_db;
1168 }
1169
1170
1171 /*
1172  * This processes a device up event. We only start up
1173  * the loopback device & ethernet devices with correct
1174  * MAC addreses automatically. Others must be started
1175  * specifically.
1176  *
1177  * FIXME: How should we configure the loopback address ? If we could dispense
1178  * with using decnet_address here and for autobind, it will be one less thing
1179  * for users to worry about setting up.
1180  */
1181
1182 void dn_dev_up(struct net_device *dev)
1183 {
1184         struct dn_ifaddr *ifa;
1185         __le16 addr = decnet_address;
1186         int maybe_default = 0;
1187         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1188
1189         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1190                 return;
1191
1192         /*
1193          * Need to ensure that loopback device has a dn_db attached to it
1194          * to allow creation of neighbours against it, even though it might
1195          * not have a local address of its own. Might as well do the same for
1196          * all autoconfigured interfaces.
1197          */
1198         if (dn_db == NULL) {
1199                 int err;
1200                 dn_db = dn_dev_create(dev, &err);
1201                 if (dn_db == NULL)
1202                         return;
1203         }
1204
1205         if (dev->type == ARPHRD_ETHER) {
1206                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1207                         return;
1208                 addr = dn_eth2dn(dev->dev_addr);
1209                 maybe_default = 1;
1210         }
1211
1212         if (addr == 0)
1213                 return;
1214
1215         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1216                 return;
1217
1218         ifa->ifa_local = ifa->ifa_address = addr;
1219         ifa->ifa_flags = 0;
1220         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1221         strcpy(ifa->ifa_label, dev->name);
1222
1223         dn_dev_set_ifa(dev, ifa);
1224
1225         /*
1226          * Automagically set the default device to the first automatically
1227          * configured ethernet card in the system.
1228          */
1229         if (maybe_default) {
1230                 dev_hold(dev);
1231                 if (dn_dev_set_default(dev, 0))
1232                         dev_put(dev);
1233         }
1234 }
1235
1236 static void dn_dev_delete(struct net_device *dev)
1237 {
1238         struct dn_dev *dn_db = dev->dn_ptr;
1239
1240         if (dn_db == NULL)
1241                 return;
1242
1243         del_timer_sync(&dn_db->timer);
1244         dn_dev_sysctl_unregister(&dn_db->parms);
1245         dn_dev_check_default(dev);
1246         neigh_ifdown(&dn_neigh_table, dev);
1247
1248         if (dn_db->parms.down)
1249                 dn_db->parms.down(dev);
1250
1251         dev->dn_ptr = NULL;
1252
1253         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1254         neigh_ifdown(&dn_neigh_table, dev);
1255
1256         if (dn_db->router)
1257                 neigh_release(dn_db->router);
1258         if (dn_db->peer)
1259                 neigh_release(dn_db->peer);
1260
1261         kfree(dn_db);
1262 }
1263
1264 void dn_dev_down(struct net_device *dev)
1265 {
1266         struct dn_dev *dn_db = dev->dn_ptr;
1267         struct dn_ifaddr *ifa;
1268
1269         if (dn_db == NULL)
1270                 return;
1271
1272         while((ifa = dn_db->ifa_list) != NULL) {
1273                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1274                 dn_dev_free_ifa(ifa);
1275         }
1276
1277         dn_dev_delete(dev);
1278 }
1279
1280 void dn_dev_init_pkt(struct sk_buff *skb)
1281 {
1282         return;
1283 }
1284
1285 void dn_dev_veri_pkt(struct sk_buff *skb)
1286 {
1287         return;
1288 }
1289
1290 void dn_dev_hello(struct sk_buff *skb)
1291 {
1292         return;
1293 }
1294
1295 void dn_dev_devices_off(void)
1296 {
1297         struct net_device *dev;
1298
1299         rtnl_lock();
1300         for_each_netdev(&init_net, dev)
1301                 dn_dev_down(dev);
1302         rtnl_unlock();
1303
1304 }
1305
1306 void dn_dev_devices_on(void)
1307 {
1308         struct net_device *dev;
1309
1310         rtnl_lock();
1311         for_each_netdev(&init_net, dev) {
1312                 if (dev->flags & IFF_UP)
1313                         dn_dev_up(dev);
1314         }
1315         rtnl_unlock();
1316 }
1317
1318 int register_dnaddr_notifier(struct notifier_block *nb)
1319 {
1320         return blocking_notifier_chain_register(&dnaddr_chain, nb);
1321 }
1322
1323 int unregister_dnaddr_notifier(struct notifier_block *nb)
1324 {
1325         return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1326 }
1327
1328 #ifdef CONFIG_PROC_FS
1329 static inline int is_dn_dev(struct net_device *dev)
1330 {
1331         return dev->dn_ptr != NULL;
1332 }
1333
1334 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1335 {
1336         int i;
1337         struct net_device *dev;
1338
1339         read_lock(&dev_base_lock);
1340
1341         if (*pos == 0)
1342                 return SEQ_START_TOKEN;
1343
1344         i = 1;
1345         for_each_netdev(&init_net, dev) {
1346                 if (!is_dn_dev(dev))
1347                         continue;
1348
1349                 if (i++ == *pos)
1350                         return dev;
1351         }
1352
1353         return NULL;
1354 }
1355
1356 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1357 {
1358         struct net_device *dev;
1359
1360         ++*pos;
1361
1362         dev = (struct net_device *)v;
1363         if (v == SEQ_START_TOKEN)
1364                 dev = net_device_entry(&init_net.dev_base_head);
1365
1366         for_each_netdev_continue(&init_net, dev) {
1367                 if (!is_dn_dev(dev))
1368                         continue;
1369
1370                 return dev;
1371         }
1372
1373         return NULL;
1374 }
1375
1376 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1377 {
1378         read_unlock(&dev_base_lock);
1379 }
1380
1381 static char *dn_type2asc(char type)
1382 {
1383         switch(type) {
1384                 case DN_DEV_BCAST:
1385                         return "B";
1386                 case DN_DEV_UCAST:
1387                         return "U";
1388                 case DN_DEV_MPOINT:
1389                         return "M";
1390         }
1391
1392         return "?";
1393 }
1394
1395 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1396 {
1397         if (v == SEQ_START_TOKEN)
1398                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1399         else {
1400                 struct net_device *dev = v;
1401                 char peer_buf[DN_ASCBUF_LEN];
1402                 char router_buf[DN_ASCBUF_LEN];
1403                 struct dn_dev *dn_db = dev->dn_ptr;
1404
1405                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1406                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1407                                 dev->name ? dev->name : "???",
1408                                 dn_type2asc(dn_db->parms.mode),
1409                                 0, 0,
1410                                 dn_db->t3, dn_db->parms.t3,
1411                                 mtu2blksize(dev),
1412                                 dn_db->parms.priority,
1413                                 dn_db->parms.state, dn_db->parms.name,
1414                                 dn_db->router ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1415                                 dn_db->peer ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1416         }
1417         return 0;
1418 }
1419
1420 static const struct seq_operations dn_dev_seq_ops = {
1421         .start  = dn_dev_seq_start,
1422         .next   = dn_dev_seq_next,
1423         .stop   = dn_dev_seq_stop,
1424         .show   = dn_dev_seq_show,
1425 };
1426
1427 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1428 {
1429         return seq_open(file, &dn_dev_seq_ops);
1430 }
1431
1432 static const struct file_operations dn_dev_seq_fops = {
1433         .owner   = THIS_MODULE,
1434         .open    = dn_dev_seq_open,
1435         .read    = seq_read,
1436         .llseek  = seq_lseek,
1437         .release = seq_release,
1438 };
1439
1440 #endif /* CONFIG_PROC_FS */
1441
1442 static int __initdata addr[2];
1443 module_param_array(addr, int, NULL, 0444);
1444 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1445
1446 void __init dn_dev_init(void)
1447 {
1448         if (addr[0] > 63 || addr[0] < 0) {
1449                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1450                 return;
1451         }
1452
1453         if (addr[1] > 1023 || addr[1] < 0) {
1454                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1455                 return;
1456         }
1457
1458         decnet_address = dn_htons((addr[0] << 10) | addr[1]);
1459
1460         dn_dev_devices_on();
1461
1462         rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL);
1463         rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL);
1464         rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr);
1465
1466         proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1467
1468 #ifdef CONFIG_SYSCTL
1469         {
1470                 int i;
1471                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1472                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1473         }
1474 #endif /* CONFIG_SYSCTL */
1475 }
1476
1477 void __exit dn_dev_cleanup(void)
1478 {
1479 #ifdef CONFIG_SYSCTL
1480         {
1481                 int i;
1482                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1483                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1484         }
1485 #endif /* CONFIG_SYSCTL */
1486
1487         proc_net_remove(&init_net, "decnet_dev");
1488
1489         dn_dev_devices_off();
1490 }