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/capability.h>
  29 #include <linux/module.h>
  30 #include <linux/moduleparam.h>
  31 #include <linux/init.h>
  32 #include <linux/net.h>
  33 #include <linux/netdevice.h>
  34 #include <linux/proc_fs.h>
  35 #include <linux/seq_file.h>
  36 #include <linux/timer.h>
  37 #include <linux/string.h>
  38 #include <linux/if_arp.h>
  39 #include <linux/if_ether.h>
  40 #include <linux/skbuff.h>
  41 #include <linux/rtnetlink.h>
  42 #include <linux/sysctl.h>
  43 #include <linux/notifier.h>
  44 #include <asm/uaccess.h>
  45 #include <asm/system.h>
  46 #include <net/neighbour.h>
  47 #include <net/dst.h>
  48 #include <net/flow.h>
  49 #include <net/dn.h>
  50 #include <net/dn_dev.h>
  51 #include <net/dn_route.h>
  52 #include <net/dn_neigh.h>
  53 #include <net/dn_fib.h>
  54
  55 #define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
  56
  57 static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
  58 static char dn_rt_all_rt_mcast[ETH_ALEN]  = {0xAB,0x00,0x00,0x03,0x00,0x00};
  59 static char dn_hiord[ETH_ALEN]            = {0xAA,0x00,0x04,0x00,0x00,0x00};
  60 static unsigned char dn_eco_version[3]    = {0x02,0x00,0x00};
  61
  62 extern struct neigh_table dn_neigh_table;
  63
  64 /*
  65  * decnet_address is kept in network order.
  66  */
  67 __le16 decnet_address = 0;
  68
  69 static DEFINE_RWLOCK(dndev_lock);
  70 static struct net_device *decnet_default_device;
  71 static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
  72
  73 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
  74 static void dn_dev_delete(struct net_device *dev);
  75 static void rtmsg_ifa(int event, struct dn_ifaddr *ifa);
  76
  77 static int dn_eth_up(struct net_device *);
  78 static void dn_eth_down(struct net_device *);
  79 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  80 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  81
  82 static struct dn_dev_parms dn_dev_list[] =  {
  83 {
  84         .type =         ARPHRD_ETHER, /* Ethernet */
  85         .mode =         DN_DEV_BCAST,
  86         .state =        DN_DEV_S_RU,
  87         .t2 =           1,
  88         .t3 =           10,
  89         .name =         "ethernet",
  90         .ctl_name =     NET_DECNET_CONF_ETHER,
  91         .up =           dn_eth_up,
  92         .down =         dn_eth_down,
  93         .timer3 =       dn_send_brd_hello,
  94 },
  95 {
  96         .type =         ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
  97         .mode =         DN_DEV_BCAST,
  98         .state =        DN_DEV_S_RU,
  99         .t2 =           1,
 100         .t3 =           10,
 101         .name =         "ipgre",
 102         .ctl_name =     NET_DECNET_CONF_GRE,
 103         .timer3 =       dn_send_brd_hello,
 104 },
 105 #if 0
 106 {
 107         .type =         ARPHRD_X25, /* Bog standard X.25 */
 108         .mode =         DN_DEV_UCAST,
 109         .state =        DN_DEV_S_DS,
 110         .t2 =           1,
 111         .t3 =           120,
 112         .name =         "x25",
 113         .ctl_name =     NET_DECNET_CONF_X25,
 114         .timer3 =       dn_send_ptp_hello,
 115 },
 116 #endif
 117 #if 0
 118 {
 119         .type =         ARPHRD_PPP, /* DECnet over PPP */
 120         .mode =         DN_DEV_BCAST,
 121         .state =        DN_DEV_S_RU,
 122         .t2 =           1,
 123         .t3 =           10,
 124         .name =         "ppp",
 125         .ctl_name =     NET_DECNET_CONF_PPP,
 126         .timer3 =       dn_send_brd_hello,
 127 },
 128 #endif
 129 {
 130         .type =         ARPHRD_DDCMP, /* DECnet over DDCMP */
 131         .mode =         DN_DEV_UCAST,
 132         .state =        DN_DEV_S_DS,
 133         .t2 =           1,
 134         .t3 =           120,
 135         .name =         "ddcmp",
 136         .ctl_name =     NET_DECNET_CONF_DDCMP,
 137         .timer3 =       dn_send_ptp_hello,
 138 },
 139 {
 140         .type =         ARPHRD_LOOPBACK, /* Loopback interface - always last */
 141         .mode =         DN_DEV_BCAST,
 142         .state =        DN_DEV_S_RU,
 143         .t2 =           1,
 144         .t3 =           10,
 145         .name =         "loopback",
 146         .ctl_name =     NET_DECNET_CONF_LOOPBACK,
 147         .timer3 =       dn_send_brd_hello,
 148 }
 149 };
 150
 151 #define DN_DEV_LIST_SIZE (sizeof(dn_dev_list)/sizeof(struct dn_dev_parms))
 152
 153 #define DN_DEV_PARMS_OFFSET(x) ((int) ((char *) &((struct dn_dev_parms *)0)->x))
 154
 155 #ifdef CONFIG_SYSCTL
 156
 157 static int min_t2[] = { 1 };
 158 static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
 159 static int min_t3[] = { 1 };
 160 static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
 161
 162 static int min_priority[1];
 163 static int max_priority[] = { 127 }; /* From DECnet spec */
 164
 165 static int dn_forwarding_proc(ctl_table *, int, struct file *,
 166                         void __user *, size_t *, loff_t *);
 167 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
 168                         void __user *oldval, size_t __user *oldlenp,
 169                         void __user *newval, size_t newlen,
 170                         void **context);
 171
 172 static struct dn_dev_sysctl_table {
 173         struct ctl_table_header *sysctl_header;
 174         ctl_table dn_dev_vars[5];
 175         ctl_table dn_dev_dev[2];
 176         ctl_table dn_dev_conf_dir[2];
 177         ctl_table dn_dev_proto_dir[2];
 178         ctl_table dn_dev_root_dir[2];
 179 } dn_dev_sysctl = {
 180         NULL,
 181         {
 182         {
 183                 .ctl_name = NET_DECNET_CONF_DEV_FORWARDING,
 184                 .procname = "forwarding",
 185                 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
 186                 .maxlen = sizeof(int),
 187                 .mode = 0644,
 188                 .proc_handler = dn_forwarding_proc,
 189                 .strategy = dn_forwarding_sysctl,
 190         },
 191         {
 192                 .ctl_name = NET_DECNET_CONF_DEV_PRIORITY,
 193                 .procname = "priority",
 194                 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
 195                 .maxlen = sizeof(int),
 196                 .mode = 0644,
 197                 .proc_handler = proc_dointvec_minmax,
 198                 .strategy = sysctl_intvec,
 199                 .extra1 = &min_priority,
 200                 .extra2 = &max_priority
 201         },
 202         {
 203                 .ctl_name = NET_DECNET_CONF_DEV_T2,
 204                 .procname = "t2",
 205                 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
 206                 .maxlen = sizeof(int),
 207                 .mode = 0644,
 208                 .proc_handler = proc_dointvec_minmax,
 209                 .strategy = sysctl_intvec,
 210                 .extra1 = &min_t2,
 211                 .extra2 = &max_t2
 212         },
 213         {
 214                 .ctl_name = NET_DECNET_CONF_DEV_T3,
 215                 .procname = "t3",
 216                 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
 217                 .maxlen = sizeof(int),
 218                 .mode = 0644,
 219                 .proc_handler = proc_dointvec_minmax,
 220                 .strategy = sysctl_intvec,
 221                 .extra1 = &min_t3,
 222                 .extra2 = &max_t3
 223         },
 224         {0}
 225         },
 226         {{
 227                 .ctl_name = 0,
 228                 .procname = "",
 229                 .mode = 0555,
 230                 .child = dn_dev_sysctl.dn_dev_vars
 231         }, {0}},
 232         {{
 233                 .ctl_name = NET_DECNET_CONF,
 234                 .procname = "conf",
 235                 .mode = 0555,
 236                 .child = dn_dev_sysctl.dn_dev_dev
 237         }, {0}},
 238         {{
 239                 .ctl_name = NET_DECNET,
 240                 .procname = "decnet",
 241                 .mode = 0555,
 242                 .child = dn_dev_sysctl.dn_dev_conf_dir
 243         }, {0}},
 244         {{
 245                 .ctl_name = CTL_NET,
 246                 .procname = "net",
 247                 .mode = 0555,
 248                 .child = dn_dev_sysctl.dn_dev_proto_dir
 249         }, {0}}
 250 };
 251
 252 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 253 {
 254         struct dn_dev_sysctl_table *t;
 255         int i;
 256
 257         t = kmalloc(sizeof(*t), GFP_KERNEL);
 258         if (t == NULL)
 259                 return;
 260
 261         memcpy(t, &dn_dev_sysctl, sizeof(*t));
 262
 263         for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
 264                 long offset = (long)t->dn_dev_vars[i].data;
 265                 t->dn_dev_vars[i].data = ((char *)parms) + offset;
 266                 t->dn_dev_vars[i].de = NULL;
 267         }
 268
 269         if (dev) {
 270                 t->dn_dev_dev[0].procname = dev->name;
 271                 t->dn_dev_dev[0].ctl_name = dev->ifindex;
 272         } else {
 273                 t->dn_dev_dev[0].procname = parms->name;
 274                 t->dn_dev_dev[0].ctl_name = parms->ctl_name;
 275         }
 276
 277         t->dn_dev_dev[0].child = t->dn_dev_vars;
 278         t->dn_dev_dev[0].de = NULL;
 279         t->dn_dev_conf_dir[0].child = t->dn_dev_dev;
 280         t->dn_dev_conf_dir[0].de = NULL;
 281         t->dn_dev_proto_dir[0].child = t->dn_dev_conf_dir;
 282         t->dn_dev_proto_dir[0].de = NULL;
 283         t->dn_dev_root_dir[0].child = t->dn_dev_proto_dir;
 284         t->dn_dev_root_dir[0].de = NULL;
 285         t->dn_dev_vars[0].extra1 = (void *)dev;
 286
 287         t->sysctl_header = register_sysctl_table(t->dn_dev_root_dir, 0);
 288         if (t->sysctl_header == NULL)
 289                 kfree(t);
 290         else
 291                 parms->sysctl = t;
 292 }
 293
 294 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 295 {
 296         if (parms->sysctl) {
 297                 struct dn_dev_sysctl_table *t = parms->sysctl;
 298                 parms->sysctl = NULL;
 299                 unregister_sysctl_table(t->sysctl_header);
 300                 kfree(t);
 301         }
 302 }
 303
 304 static int dn_forwarding_proc(ctl_table *table, int write,
 305                                 struct file *filep,
 306                                 void __user *buffer,
 307                                 size_t *lenp, loff_t *ppos)
 308 {
 309 #ifdef CONFIG_DECNET_ROUTER
 310         struct net_device *dev = table->extra1;
 311         struct dn_dev *dn_db;
 312         int err;
 313         int tmp, old;
 314
 315         if (table->extra1 == NULL)
 316                 return -EINVAL;
 317
 318         dn_db = dev->dn_ptr;
 319         old = dn_db->parms.forwarding;
 320
 321         err = proc_dointvec(table, write, filep, buffer, lenp, ppos);
 322
 323         if ((err >= 0) && write) {
 324                 if (dn_db->parms.forwarding < 0)
 325                         dn_db->parms.forwarding = 0;
 326                 if (dn_db->parms.forwarding > 2)
 327                         dn_db->parms.forwarding = 2;
 328                 /*
 329                  * What an ugly hack this is... its works, just. It
 330                  * would be nice if sysctl/proc were just that little
 331                  * bit more flexible so I don't have to write a special
 332                  * routine, or suffer hacks like this - SJW
 333                  */
 334                 tmp = dn_db->parms.forwarding;
 335                 dn_db->parms.forwarding = old;
 336                 if (dn_db->parms.down)
 337                         dn_db->parms.down(dev);
 338                 dn_db->parms.forwarding = tmp;
 339                 if (dn_db->parms.up)
 340                         dn_db->parms.up(dev);
 341         }
 342
 343         return err;
 344 #else
 345         return -EINVAL;
 346 #endif
 347 }
 348
 349 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
 350                         void __user *oldval, size_t __user *oldlenp,
 351                         void __user *newval, size_t newlen,
 352                         void **context)
 353 {
 354 #ifdef CONFIG_DECNET_ROUTER
 355         struct net_device *dev = table->extra1;
 356         struct dn_dev *dn_db;
 357         int value;
 358
 359         if (table->extra1 == NULL)
 360                 return -EINVAL;
 361
 362         dn_db = dev->dn_ptr;
 363
 364         if (newval && newlen) {
 365                 if (newlen != sizeof(int))
 366                         return -EINVAL;
 367
 368                 if (get_user(value, (int __user *)newval))
 369                         return -EFAULT;
 370                 if (value < 0)
 371                         return -EINVAL;
 372                 if (value > 2)
 373                         return -EINVAL;
 374
 375                 if (dn_db->parms.down)
 376                         dn_db->parms.down(dev);
 377                 dn_db->parms.forwarding = value;
 378                 if (dn_db->parms.up)
 379                         dn_db->parms.up(dev);
 380         }
 381
 382         return 0;
 383 #else
 384         return -EINVAL;
 385 #endif
 386 }
 387
 388 #else /* CONFIG_SYSCTL */
 389 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 390 {
 391 }
 392 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 393 {
 394 }
 395
 396 #endif /* CONFIG_SYSCTL */
 397
 398 static inline __u16 mtu2blksize(struct net_device *dev)
 399 {
 400         u32 blksize = dev->mtu;
 401         if (blksize > 0xffff)
 402                 blksize = 0xffff;
 403
 404         if (dev->type == ARPHRD_ETHER ||
 405             dev->type == ARPHRD_PPP ||
 406             dev->type == ARPHRD_IPGRE ||
 407             dev->type == ARPHRD_LOOPBACK)
 408                 blksize -= 2;
 409
 410         return (__u16)blksize;
 411 }
 412
 413 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
 414 {
 415         struct dn_ifaddr *ifa;
 416
 417         ifa = kmalloc(sizeof(*ifa), GFP_KERNEL);
 418
 419         if (ifa) {
 420                 memset(ifa, 0, sizeof(*ifa));
 421         }
 422
 423         return ifa;
 424 }
 425
 426 static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
 427 {
 428         kfree(ifa);
 429 }
 430
 431 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
 432 {
 433         struct dn_ifaddr *ifa1 = *ifap;
 434         unsigned char mac_addr[6];
 435         struct net_device *dev = dn_db->dev;
 436
 437         ASSERT_RTNL();
 438
 439         *ifap = ifa1->ifa_next;
 440
 441         if (dn_db->dev->type == ARPHRD_ETHER) {
 442                 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
 443                         dn_dn2eth(mac_addr, ifa1->ifa_local);
 444                         dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
 445                 }
 446         }
 447
 448         rtmsg_ifa(RTM_DELADDR, ifa1);
 449         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
 450         if (destroy) {
 451                 dn_dev_free_ifa(ifa1);
 452
 453                 if (dn_db->ifa_list == NULL)
 454                         dn_dev_delete(dn_db->dev);
 455         }
 456 }
 457
 458 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 459 {
 460         struct net_device *dev = dn_db->dev;
 461         struct dn_ifaddr *ifa1;
 462         unsigned char mac_addr[6];
 463
 464         ASSERT_RTNL();
 465
 466         /* Check for duplicates */
 467         for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
 468                 if (ifa1->ifa_local == ifa->ifa_local)
 469                         return -EEXIST;
 470         }
 471
 472         if (dev->type == ARPHRD_ETHER) {
 473                 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
 474                         dn_dn2eth(mac_addr, ifa->ifa_local);
 475                         dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
 476                         dev_mc_upload(dev);
 477                 }
 478         }
 479
 480         ifa->ifa_next = dn_db->ifa_list;
 481         dn_db->ifa_list = ifa;
 482
 483         rtmsg_ifa(RTM_NEWADDR, ifa);
 484         blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
 485
 486         return 0;
 487 }
 488
 489 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
 490 {
 491         struct dn_dev *dn_db = dev->dn_ptr;
 492         int rv;
 493
 494         if (dn_db == NULL) {
 495                 int err;
 496                 dn_db = dn_dev_create(dev, &err);
 497                 if (dn_db == NULL)
 498                         return err;
 499         }
 500
 501         ifa->ifa_dev = dn_db;
 502
 503         if (dev->flags & IFF_LOOPBACK)
 504                 ifa->ifa_scope = RT_SCOPE_HOST;
 505
 506         rv = dn_dev_insert_ifa(dn_db, ifa);
 507         if (rv)
 508                 dn_dev_free_ifa(ifa);
 509         return rv;
 510 }
 511
 512
 513 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
 514 {
 515         char buffer[DN_IFREQ_SIZE];
 516         struct ifreq *ifr = (struct ifreq *)buffer;
 517         struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
 518         struct dn_dev *dn_db;
 519         struct net_device *dev;
 520         struct dn_ifaddr *ifa = NULL, **ifap = NULL;
 521         int ret = 0;
 522
 523         if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
 524                 return -EFAULT;
 525         ifr->ifr_name[IFNAMSIZ-1] = 0;
 526
 527 #ifdef CONFIG_KMOD
 528         dev_load(ifr->ifr_name);
 529 #endif
 530
 531         switch(cmd) {
 532                 case SIOCGIFADDR:
 533                         break;
 534                 case SIOCSIFADDR:
 535                         if (!capable(CAP_NET_ADMIN))
 536                                 return -EACCES;
 537                         if (sdn->sdn_family != AF_DECnet)
 538                                 return -EINVAL;
 539                         break;
 540                 default:
 541                         return -EINVAL;
 542         }
 543
 544         rtnl_lock();
 545
 546         if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL) {
 547                 ret = -ENODEV;
 548                 goto done;
 549         }
 550
 551         if ((dn_db = dev->dn_ptr) != NULL) {
 552                 for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
 553                         if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
 554                                 break;
 555         }
 556
 557         if (ifa == NULL && cmd != SIOCSIFADDR) {
 558                 ret = -EADDRNOTAVAIL;
 559                 goto done;
 560         }
 561
 562         switch(cmd) {
 563                 case SIOCGIFADDR:
 564                         *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
 565                         goto rarok;
 566
 567                 case SIOCSIFADDR:
 568                         if (!ifa) {
 569                                 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
 570                                         ret = -ENOBUFS;
 571                                         break;
 572                                 }
 573                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 574                         } else {
 575                                 if (ifa->ifa_local == dn_saddr2dn(sdn))
 576                                         break;
 577                                 dn_dev_del_ifa(dn_db, ifap, 0);
 578                         }
 579
 580                         ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
 581
 582                         ret = dn_dev_set_ifa(dev, ifa);
 583         }
 584 done:
 585         rtnl_unlock();
 586
 587         return ret;
 588 rarok:
 589         if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
 590                 ret = -EFAULT;
 591         goto done;
 592 }
 593
 594 struct net_device *dn_dev_get_default(void)
 595 {
 596         struct net_device *dev;
 597         read_lock(&dndev_lock);
 598         dev = decnet_default_device;
 599         if (dev) {
 600                 if (dev->dn_ptr)
 601                         dev_hold(dev);
 602                 else
 603                         dev = NULL;
 604         }
 605         read_unlock(&dndev_lock);
 606         return dev;
 607 }
 608
 609 int dn_dev_set_default(struct net_device *dev, int force)
 610 {
 611         struct net_device *old = NULL;
 612         int rv = -EBUSY;
 613         if (!dev->dn_ptr)
 614                 return -ENODEV;
 615         write_lock(&dndev_lock);
 616         if (force || decnet_default_device == NULL) {
 617                 old = decnet_default_device;
 618                 decnet_default_device = dev;
 619                 rv = 0;
 620         }
 621         write_unlock(&dndev_lock);
 622         if (old)
 623                 dev_put(old);
 624         return rv;
 625 }
 626
 627 static void dn_dev_check_default(struct net_device *dev)
 628 {
 629         write_lock(&dndev_lock);
 630         if (dev == decnet_default_device) {
 631                 decnet_default_device = NULL;
 632         } else {
 633                 dev = NULL;
 634         }
 635         write_unlock(&dndev_lock);
 636         if (dev)
 637                 dev_put(dev);
 638 }
 639
 640 static struct dn_dev *dn_dev_by_index(int ifindex)
 641 {
 642         struct net_device *dev;
 643         struct dn_dev *dn_dev = NULL;
 644         dev = dev_get_by_index(ifindex);
 645         if (dev) {
 646                 dn_dev = dev->dn_ptr;
 647                 dev_put(dev);
 648         }
 649
 650         return dn_dev;
 651 }
 652
 653 static int dn_dev_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 654 {
 655         struct rtattr **rta = arg;
 656         struct dn_dev *dn_db;
 657         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
 658         struct dn_ifaddr *ifa, **ifap;
 659
 660         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
 661                 return -EADDRNOTAVAIL;
 662
 663         for(ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next) {
 664                 void *tmp = rta[IFA_LOCAL-1];
 665                 if ((tmp && memcmp(RTA_DATA(tmp), &ifa->ifa_local, 2)) ||
 666                     (rta[IFA_LABEL-1] && rtattr_strcmp(rta[IFA_LABEL-1], ifa->ifa_label)))
 667                         continue;
 668
 669                 dn_dev_del_ifa(dn_db, ifap, 1);
 670                 return 0;
 671         }
 672
 673         return -EADDRNOTAVAIL;
 674 }
 675
 676 static int dn_dev_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 677 {
 678         struct rtattr **rta = arg;
 679         struct net_device *dev;
 680         struct dn_dev *dn_db;
 681         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
 682         struct dn_ifaddr *ifa;
 683         int rv;
 684
 685         if (rta[IFA_LOCAL-1] == NULL)
 686                 return -EINVAL;
 687
 688         if ((dev = __dev_get_by_index(ifm->ifa_index)) == NULL)
 689                 return -ENODEV;
 690
 691         if ((dn_db = dev->dn_ptr) == NULL) {
 692                 int err;
 693                 dn_db = dn_dev_create(dev, &err);
 694                 if (!dn_db)
 695                         return err;
 696         }
 697
 698         if ((ifa = dn_dev_alloc_ifa()) == NULL)
 699                 return -ENOBUFS;
 700
 701         if (!rta[IFA_ADDRESS - 1])
 702                 rta[IFA_ADDRESS - 1] = rta[IFA_LOCAL - 1];
 703         memcpy(&ifa->ifa_local, RTA_DATA(rta[IFA_LOCAL-1]), 2);
 704         memcpy(&ifa->ifa_address, RTA_DATA(rta[IFA_ADDRESS-1]), 2);
 705         ifa->ifa_flags = ifm->ifa_flags;
 706         ifa->ifa_scope = ifm->ifa_scope;
 707         ifa->ifa_dev = dn_db;
 708         if (rta[IFA_LABEL-1])
 709                 rtattr_strlcpy(ifa->ifa_label, rta[IFA_LABEL-1], IFNAMSIZ);
 710         else
 711                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 712
 713         rv = dn_dev_insert_ifa(dn_db, ifa);
 714         if (rv)
 715                 dn_dev_free_ifa(ifa);
 716         return rv;
 717 }
 718
 719 static int dn_dev_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
 720                                 u32 pid, u32 seq, int event, unsigned int flags)
 721 {
 722         struct ifaddrmsg *ifm;
 723         struct nlmsghdr *nlh;
 724         unsigned char *b = skb->tail;
 725
 726         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
 727         ifm = NLMSG_DATA(nlh);
 728
 729         ifm->ifa_family = AF_DECnet;
 730         ifm->ifa_prefixlen = 16;
 731         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
 732         ifm->ifa_scope = ifa->ifa_scope;
 733         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
 734         if (ifa->ifa_address)
 735                 RTA_PUT(skb, IFA_ADDRESS, 2, &ifa->ifa_address);
 736         if (ifa->ifa_local)
 737                 RTA_PUT(skb, IFA_LOCAL, 2, &ifa->ifa_local);
 738         if (ifa->ifa_label[0])
 739                 RTA_PUT(skb, IFA_LABEL, IFNAMSIZ, &ifa->ifa_label);
 740         nlh->nlmsg_len = skb->tail - b;
 741         return skb->len;
 742
 743 nlmsg_failure:
 744 rtattr_failure:
 745         skb_trim(skb, b - skb->data);
 746         return -1;
 747 }
 748
 749 static void rtmsg_ifa(int event, struct dn_ifaddr *ifa)
 750 {
 751         struct sk_buff *skb;
 752         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
 753
 754         skb = alloc_skb(size, GFP_KERNEL);
 755         if (!skb) {
 756                 netlink_set_err(rtnl, 0, RTNLGRP_DECnet_IFADDR, ENOBUFS);
 757                 return;
 758         }
 759         if (dn_dev_fill_ifaddr(skb, ifa, 0, 0, event, 0) < 0) {
 760                 kfree_skb(skb);
 761                 netlink_set_err(rtnl, 0, RTNLGRP_DECnet_IFADDR, EINVAL);
 762                 return;
 763         }
 764         NETLINK_CB(skb).dst_group = RTNLGRP_DECnet_IFADDR;
 765         netlink_broadcast(rtnl, skb, 0, RTNLGRP_DECnet_IFADDR, GFP_KERNEL);
 766 }
 767
 768 static int dn_dev_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 769 {
 770         int idx, dn_idx;
 771         int s_idx, s_dn_idx;
 772         struct net_device *dev;
 773         struct dn_dev *dn_db;
 774         struct dn_ifaddr *ifa;
 775
 776         s_idx = cb->args[0];
 777         s_dn_idx = dn_idx = cb->args[1];
 778         read_lock(&dev_base_lock);
 779         for(dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
 780                 if (idx < s_idx)
 781                         continue;
 782                 if (idx > s_idx)
 783                         s_dn_idx = 0;
 784                 if ((dn_db = dev->dn_ptr) == NULL)
 785                         continue;
 786
 787                 for(ifa = dn_db->ifa_list, dn_idx = 0; ifa; ifa = ifa->ifa_next, dn_idx++) {
 788                         if (dn_idx < s_dn_idx)
 789                                 continue;
 790
 791                         if (dn_dev_fill_ifaddr(skb, ifa,
 792                                                NETLINK_CB(cb->skb).pid,
 793                                                cb->nlh->nlmsg_seq,
 794                                                RTM_NEWADDR,
 795                                                NLM_F_MULTI) <= 0)
 796                                 goto done;
 797                 }
 798         }
 799 done:
 800         read_unlock(&dev_base_lock);
 801         cb->args[0] = idx;
 802         cb->args[1] = dn_idx;
 803
 804         return skb->len;
 805 }
 806
 807 static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
 808 {
 809         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 810         struct dn_ifaddr *ifa;
 811         int rv = -ENODEV;
 812         if (dn_db == NULL)
 813                 goto out;
 814         ifa = dn_db->ifa_list;
 815         if (ifa != NULL) {
 816                 *addr = ifa->ifa_local;
 817                 rv = 0;
 818         }
 819 out:
 820         return rv;
 821 }
 822
 823 /*
 824  * Find a default address to bind to.
 825  *
 826  * This is one of those areas where the initial VMS concepts don't really
 827  * map onto the Linux concepts, and since we introduced multiple addresses
 828  * per interface we have to cope with slightly odd ways of finding out what
 829  * "our address" really is. Mostly it's not a problem; for this we just guess
 830  * a sensible default. Eventually the routing code will take care of all the
 831  * nasties for us I hope.
 832  */
 833 int dn_dev_bind_default(__le16 *addr)
 834 {
 835         struct net_device *dev;
 836         int rv;
 837         dev = dn_dev_get_default();
 838 last_chance:
 839         if (dev) {
 840                 read_lock(&dev_base_lock);
 841                 rv = dn_dev_get_first(dev, addr);
 842                 read_unlock(&dev_base_lock);
 843                 dev_put(dev);
 844                 if (rv == 0 || dev == &loopback_dev)
 845                         return rv;
 846         }
 847         dev = &loopback_dev;
 848         dev_hold(dev);
 849         goto last_chance;
 850 }
 851
 852 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 853 {
 854         struct endnode_hello_message *msg;
 855         struct sk_buff *skb = NULL;
 856         __le16 *pktlen;
 857         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 858
 859         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
 860                 return;
 861
 862         skb->dev = dev;
 863
 864         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
 865
 866         msg->msgflg  = 0x0D;
 867         memcpy(msg->tiver, dn_eco_version, 3);
 868         dn_dn2eth(msg->id, ifa->ifa_local);
 869         msg->iinfo   = DN_RT_INFO_ENDN;
 870         msg->blksize = dn_htons(mtu2blksize(dev));
 871         msg->area    = 0x00;
 872         memset(msg->seed, 0, 8);
 873         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
 874
 875         if (dn_db->router) {
 876                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 877                 dn_dn2eth(msg->neighbor, dn->addr);
 878         }
 879
 880         msg->timer   = dn_htons((unsigned short)dn_db->parms.t3);
 881         msg->mpd     = 0x00;
 882         msg->datalen = 0x02;
 883         memset(msg->data, 0xAA, 2);
 884
 885         pktlen = (__le16 *)skb_push(skb,2);
 886         *pktlen = dn_htons(skb->len - 2);
 887
 888         skb->nh.raw = skb->data;
 889
 890         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
 891 }
 892
 893
 894 #define DRDELAY (5 * HZ)
 895
 896 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 897 {
 898         /* First check time since device went up */
 899         if ((jiffies - dn_db->uptime) < DRDELAY)
 900                 return 0;
 901
 902         /* If there is no router, then yes... */
 903         if (!dn_db->router)
 904                 return 1;
 905
 906         /* otherwise only if we have a higher priority or.. */
 907         if (dn->priority < dn_db->parms.priority)
 908                 return 1;
 909
 910         /* if we have equal priority and a higher node number */
 911         if (dn->priority != dn_db->parms.priority)
 912                 return 0;
 913
 914         if (dn_ntohs(dn->addr) < dn_ntohs(ifa->ifa_local))
 915                 return 1;
 916
 917         return 0;
 918 }
 919
 920 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 921 {
 922         int n;
 923         struct dn_dev *dn_db = dev->dn_ptr;
 924         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 925         struct sk_buff *skb;
 926         size_t size;
 927         unsigned char *ptr;
 928         unsigned char *i1, *i2;
 929         __le16 *pktlen;
 930         char *src;
 931
 932         if (mtu2blksize(dev) < (26 + 7))
 933                 return;
 934
 935         n = mtu2blksize(dev) - 26;
 936         n /= 7;
 937
 938         if (n > 32)
 939                 n = 32;
 940
 941         size = 2 + 26 + 7 * n;
 942
 943         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
 944                 return;
 945
 946         skb->dev = dev;
 947         ptr = skb_put(skb, size);
 948
 949         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
 950         *ptr++ = 2; /* ECO */
 951         *ptr++ = 0;
 952         *ptr++ = 0;
 953         dn_dn2eth(ptr, ifa->ifa_local);
 954         src = ptr;
 955         ptr += ETH_ALEN;
 956         *ptr++ = dn_db->parms.forwarding == 1 ?
 957                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
 958         *((__le16 *)ptr) = dn_htons(mtu2blksize(dev));
 959         ptr += 2;
 960         *ptr++ = dn_db->parms.priority; /* Priority */
 961         *ptr++ = 0; /* Area: Reserved */
 962         *((__le16 *)ptr) = dn_htons((unsigned short)dn_db->parms.t3);
 963         ptr += 2;
 964         *ptr++ = 0; /* MPD: Reserved */
 965         i1 = ptr++;
 966         memset(ptr, 0, 7); /* Name: Reserved */
 967         ptr += 7;
 968         i2 = ptr++;
 969
 970         n = dn_neigh_elist(dev, ptr, n);
 971
 972         *i2 = 7 * n;
 973         *i1 = 8 + *i2;
 974
 975         skb_trim(skb, (27 + *i2));
 976
 977         pktlen = (__le16 *)skb_push(skb, 2);
 978         *pktlen = dn_htons(skb->len - 2);
 979
 980         skb->nh.raw = skb->data;
 981
 982         if (dn_am_i_a_router(dn, dn_db, ifa)) {
 983                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
 984                 if (skb2) {
 985                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
 986                 }
 987         }
 988
 989         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
 990 }
 991
 992 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 993 {
 994         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 995
 996         if (dn_db->parms.forwarding == 0)
 997                 dn_send_endnode_hello(dev, ifa);
 998         else
 999                 dn_send_router_hello(dev, ifa);
1000 }
1001
1002 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1003 {
1004         int tdlen = 16;
1005         int size = dev->hard_header_len + 2 + 4 + tdlen;
1006         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1007         int i;
1008         unsigned char *ptr;
1009         char src[ETH_ALEN];
1010
1011         if (skb == NULL)
1012                 return ;
1013
1014         skb->dev = dev;
1015         skb_push(skb, dev->hard_header_len);
1016         ptr = skb_put(skb, 2 + 4 + tdlen);
1017
1018         *ptr++ = DN_RT_PKT_HELO;
1019         *((__le16 *)ptr) = ifa->ifa_local;
1020         ptr += 2;
1021         *ptr++ = tdlen;
1022
1023         for(i = 0; i < tdlen; i++)
1024                 *ptr++ = 0252;
1025
1026         dn_dn2eth(src, ifa->ifa_local);
1027         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1028 }
1029
1030 static int dn_eth_up(struct net_device *dev)
1031 {
1032         struct dn_dev *dn_db = dev->dn_ptr;
1033
1034         if (dn_db->parms.forwarding == 0)
1035                 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1036         else
1037                 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1038
1039         dev_mc_upload(dev);
1040
1041         dn_db->use_long = 1;
1042
1043         return 0;
1044 }
1045
1046 static void dn_eth_down(struct net_device *dev)
1047 {
1048         struct dn_dev *dn_db = dev->dn_ptr;
1049
1050         if (dn_db->parms.forwarding == 0)
1051                 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1052         else
1053                 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1054 }
1055
1056 static void dn_dev_set_timer(struct net_device *dev);
1057
1058 static void dn_dev_timer_func(unsigned long arg)
1059 {
1060         struct net_device *dev = (struct net_device *)arg;
1061         struct dn_dev *dn_db = dev->dn_ptr;
1062         struct dn_ifaddr *ifa;
1063
1064         if (dn_db->t3 <= dn_db->parms.t2) {
1065                 if (dn_db->parms.timer3) {
1066                         for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1067                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1068                                         dn_db->parms.timer3(dev, ifa);
1069                         }
1070                 }
1071                 dn_db->t3 = dn_db->parms.t3;
1072         } else {
1073                 dn_db->t3 -= dn_db->parms.t2;
1074         }
1075
1076         dn_dev_set_timer(dev);
1077 }
1078
1079 static void dn_dev_set_timer(struct net_device *dev)
1080 {
1081         struct dn_dev *dn_db = dev->dn_ptr;
1082
1083         if (dn_db->parms.t2 > dn_db->parms.t3)
1084                 dn_db->parms.t2 = dn_db->parms.t3;
1085
1086         dn_db->timer.data = (unsigned long)dev;
1087         dn_db->timer.function = dn_dev_timer_func;
1088         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1089
1090         add_timer(&dn_db->timer);
1091 }
1092
1093 struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1094 {
1095         int i;
1096         struct dn_dev_parms *p = dn_dev_list;
1097         struct dn_dev *dn_db;
1098
1099         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1100                 if (p->type == dev->type)
1101                         break;
1102         }
1103
1104         *err = -ENODEV;
1105         if (i == DN_DEV_LIST_SIZE)
1106                 return NULL;
1107
1108         *err = -ENOBUFS;
1109         if ((dn_db = kmalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1110                 return NULL;
1111
1112         memset(dn_db, 0, sizeof(struct dn_dev));
1113         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1114         smp_wmb();
1115         dev->dn_ptr = dn_db;
1116         dn_db->dev = dev;
1117         init_timer(&dn_db->timer);
1118
1119         dn_db->uptime = jiffies;
1120         if (dn_db->parms.up) {
1121                 if (dn_db->parms.up(dev) < 0) {
1122                         dev->dn_ptr = NULL;
1123                         kfree(dn_db);
1124                         return NULL;
1125                 }
1126         }
1127
1128         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1129
1130         dn_dev_sysctl_register(dev, &dn_db->parms);
1131
1132         dn_dev_set_timer(dev);
1133
1134         *err = 0;
1135         return dn_db;
1136 }
1137
1138
1139 /*
1140  * This processes a device up event. We only start up
1141  * the loopback device & ethernet devices with correct
1142  * MAC addreses automatically. Others must be started
1143  * specifically.
1144  *
1145  * FIXME: How should we configure the loopback address ? If we could dispense
1146  * with using decnet_address here and for autobind, it will be one less thing
1147  * for users to worry about setting up.
1148  */
1149
1150 void dn_dev_up(struct net_device *dev)
1151 {
1152         struct dn_ifaddr *ifa;
1153         __le16 addr = decnet_address;
1154         int maybe_default = 0;
1155         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1156
1157         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1158                 return;
1159
1160         /*
1161          * Need to ensure that loopback device has a dn_db attached to it
1162          * to allow creation of neighbours against it, even though it might
1163          * not have a local address of its own. Might as well do the same for
1164          * all autoconfigured interfaces.
1165          */
1166         if (dn_db == NULL) {
1167                 int err;
1168                 dn_db = dn_dev_create(dev, &err);
1169                 if (dn_db == NULL)
1170                         return;
1171         }
1172
1173         if (dev->type == ARPHRD_ETHER) {
1174                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1175                         return;
1176                 addr = dn_eth2dn(dev->dev_addr);
1177                 maybe_default = 1;
1178         }
1179
1180         if (addr == 0)
1181                 return;
1182
1183         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1184                 return;
1185
1186         ifa->ifa_local = ifa->ifa_address = addr;
1187         ifa->ifa_flags = 0;
1188         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1189         strcpy(ifa->ifa_label, dev->name);
1190
1191         dn_dev_set_ifa(dev, ifa);
1192
1193         /*
1194          * Automagically set the default device to the first automatically
1195          * configured ethernet card in the system.
1196          */
1197         if (maybe_default) {
1198                 dev_hold(dev);
1199                 if (dn_dev_set_default(dev, 0))
1200                         dev_put(dev);
1201         }
1202 }
1203
1204 static void dn_dev_delete(struct net_device *dev)
1205 {
1206         struct dn_dev *dn_db = dev->dn_ptr;
1207
1208         if (dn_db == NULL)
1209                 return;
1210
1211         del_timer_sync(&dn_db->timer);
1212         dn_dev_sysctl_unregister(&dn_db->parms);
1213         dn_dev_check_default(dev);
1214         neigh_ifdown(&dn_neigh_table, dev);
1215
1216         if (dn_db->parms.down)
1217                 dn_db->parms.down(dev);
1218
1219         dev->dn_ptr = NULL;
1220
1221         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1222         neigh_ifdown(&dn_neigh_table, dev);
1223
1224         if (dn_db->router)
1225                 neigh_release(dn_db->router);
1226         if (dn_db->peer)
1227                 neigh_release(dn_db->peer);
1228
1229         kfree(dn_db);
1230 }
1231
1232 void dn_dev_down(struct net_device *dev)
1233 {
1234         struct dn_dev *dn_db = dev->dn_ptr;
1235         struct dn_ifaddr *ifa;
1236
1237         if (dn_db == NULL)
1238                 return;
1239
1240         while((ifa = dn_db->ifa_list) != NULL) {
1241                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1242                 dn_dev_free_ifa(ifa);
1243         }
1244
1245         dn_dev_delete(dev);
1246 }
1247
1248 void dn_dev_init_pkt(struct sk_buff *skb)
1249 {
1250         return;
1251 }
1252
1253 void dn_dev_veri_pkt(struct sk_buff *skb)
1254 {
1255         return;
1256 }
1257
1258 void dn_dev_hello(struct sk_buff *skb)
1259 {
1260         return;
1261 }
1262
1263 void dn_dev_devices_off(void)
1264 {
1265         struct net_device *dev;
1266
1267         rtnl_lock();
1268         for(dev = dev_base; dev; dev = dev->next)
1269                 dn_dev_down(dev);
1270         rtnl_unlock();
1271
1272 }
1273
1274 void dn_dev_devices_on(void)
1275 {
1276         struct net_device *dev;
1277
1278         rtnl_lock();
1279         for(dev = dev_base; dev; dev = dev->next) {
1280                 if (dev->flags & IFF_UP)
1281                         dn_dev_up(dev);
1282         }
1283         rtnl_unlock();
1284 }
1285
1286 int register_dnaddr_notifier(struct notifier_block *nb)
1287 {
1288         return blocking_notifier_chain_register(&dnaddr_chain, nb);
1289 }
1290
1291 int unregister_dnaddr_notifier(struct notifier_block *nb)
1292 {
1293         return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1294 }
1295
1296 #ifdef CONFIG_PROC_FS
1297 static inline struct net_device *dn_dev_get_next(struct seq_file *seq, struct net_device *dev)
1298 {
1299         do {
1300                 dev = dev->next;
1301         } while(dev && !dev->dn_ptr);
1302
1303         return dev;
1304 }
1305
1306 static struct net_device *dn_dev_get_idx(struct seq_file *seq, loff_t pos)
1307 {
1308         struct net_device *dev;
1309
1310         dev = dev_base;
1311         if (dev && !dev->dn_ptr)
1312                 dev = dn_dev_get_next(seq, dev);
1313         if (pos) {
1314                 while(dev && (dev = dn_dev_get_next(seq, dev)))
1315                         --pos;
1316         }
1317         return dev;
1318 }
1319
1320 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1321 {
1322         if (*pos) {
1323                 struct net_device *dev;
1324                 read_lock(&dev_base_lock);
1325                 dev = dn_dev_get_idx(seq, *pos - 1);
1326                 if (dev == NULL)
1327                         read_unlock(&dev_base_lock);
1328                 return dev;
1329         }
1330         return SEQ_START_TOKEN;
1331 }
1332
1333 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1334 {
1335         struct net_device *dev = v;
1336         loff_t one = 1;
1337
1338         if (v == SEQ_START_TOKEN) {
1339                 dev = dn_dev_seq_start(seq, &one);
1340         } else {
1341                 dev = dn_dev_get_next(seq, dev);
1342                 if (dev == NULL)
1343                         read_unlock(&dev_base_lock);
1344         }
1345         ++*pos;
1346         return dev;
1347 }
1348
1349 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1350 {
1351         if (v && v != SEQ_START_TOKEN)
1352                 read_unlock(&dev_base_lock);
1353 }
1354
1355 static char *dn_type2asc(char type)
1356 {
1357         switch(type) {
1358                 case DN_DEV_BCAST:
1359                         return "B";
1360                 case DN_DEV_UCAST:
1361                         return "U";
1362                 case DN_DEV_MPOINT:
1363                         return "M";
1364         }
1365
1366         return "?";
1367 }
1368
1369 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1370 {
1371         if (v == SEQ_START_TOKEN)
1372                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1373         else {
1374                 struct net_device *dev = v;
1375                 char peer_buf[DN_ASCBUF_LEN];
1376                 char router_buf[DN_ASCBUF_LEN];
1377                 struct dn_dev *dn_db = dev->dn_ptr;
1378
1379                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1380                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1381                                 dev->name ? dev->name : "???",
1382                                 dn_type2asc(dn_db->parms.mode),
1383                                 0, 0,
1384                                 dn_db->t3, dn_db->parms.t3,
1385                                 mtu2blksize(dev),
1386                                 dn_db->parms.priority,
1387                                 dn_db->parms.state, dn_db->parms.name,
1388                                 dn_db->router ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1389                                 dn_db->peer ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1390         }
1391         return 0;
1392 }
1393
1394 static struct seq_operations dn_dev_seq_ops = {
1395         .start  = dn_dev_seq_start,
1396         .next   = dn_dev_seq_next,
1397         .stop   = dn_dev_seq_stop,
1398         .show   = dn_dev_seq_show,
1399 };
1400
1401 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1402 {
1403         return seq_open(file, &dn_dev_seq_ops);
1404 }
1405
1406 static struct file_operations dn_dev_seq_fops = {
1407         .owner   = THIS_MODULE,
1408         .open    = dn_dev_seq_open,
1409         .read    = seq_read,
1410         .llseek  = seq_lseek,
1411         .release = seq_release,
1412 };
1413
1414 #endif /* CONFIG_PROC_FS */
1415
1416 static struct rtnetlink_link dnet_rtnetlink_table[RTM_NR_MSGTYPES] =
1417 {
1418         [RTM_NEWADDR  - RTM_BASE] = { .doit     = dn_dev_rtm_newaddr,   },
1419         [RTM_DELADDR  - RTM_BASE] = { .doit     = dn_dev_rtm_deladdr,   },
1420         [RTM_GETADDR  - RTM_BASE] = { .dumpit   = dn_dev_dump_ifaddr,   },
1421 #ifdef CONFIG_DECNET_ROUTER
1422         [RTM_NEWROUTE - RTM_BASE] = { .doit     = dn_fib_rtm_newroute,  },
1423         [RTM_DELROUTE - RTM_BASE] = { .doit     = dn_fib_rtm_delroute,  },
1424         [RTM_GETROUTE - RTM_BASE] = { .doit     = dn_cache_getroute,
1425                                       .dumpit   = dn_fib_dump,          },
1426         [RTM_NEWRULE  - RTM_BASE] = { .doit     = dn_fib_rtm_newrule,   },
1427         [RTM_DELRULE  - RTM_BASE] = { .doit     = dn_fib_rtm_delrule,   },
1428         [RTM_GETRULE  - RTM_BASE] = { .dumpit   = dn_fib_dump_rules,    },
1429 #else
1430         [RTM_GETROUTE - RTM_BASE] = { .doit     = dn_cache_getroute,
1431                                       .dumpit   = dn_cache_dump,        },
1432 #endif
1433
1434 };
1435
1436 static int __initdata addr[2];
1437 module_param_array(addr, int, NULL, 0444);
1438 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1439
1440 void __init dn_dev_init(void)
1441 {
1442         if (addr[0] > 63 || addr[0] < 0) {
1443                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1444                 return;
1445         }
1446
1447         if (addr[1] > 1023 || addr[1] < 0) {
1448                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1449                 return;
1450         }
1451
1452         decnet_address = dn_htons((addr[0] << 10) | addr[1]);
1453
1454         dn_dev_devices_on();
1455
1456         rtnetlink_links[PF_DECnet] = dnet_rtnetlink_table;
1457
1458         proc_net_fops_create("decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1459
1460 #ifdef CONFIG_SYSCTL
1461         {
1462                 int i;
1463                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1464                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1465         }
1466 #endif /* CONFIG_SYSCTL */
1467 }
1468
1469 void __exit dn_dev_cleanup(void)
1470 {
1471         rtnetlink_links[PF_DECnet] = NULL;
1472
1473 #ifdef CONFIG_SYSCTL
1474         {
1475                 int i;
1476                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1477                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1478         }
1479 #endif /* CONFIG_SYSCTL */
1480
1481         proc_net_remove("decnet_dev");
1482
1483         dn_dev_devices_off();
1484 }