net/decnet/dn_dev.c

   1 /*
   2  * DECnet       An implementation of the DECnet protocol suite for the LINUX
   3  *              operating system.  DECnet is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              DECnet Device Layer
   7  *
   8  * Authors:     Steve Whitehouse <SteveW@ACM.org>
   9  *              Eduardo Marcelo Serrat <emserrat@geocities.com>
  10  *
  11  * Changes:
  12  *          Steve Whitehouse : Devices now see incoming frames so they
  13  *                             can mark on who it came from.
  14  *          Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
  15  *                             can now have a device specific setup func.
  16  *          Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
  17  *          Steve Whitehouse : Fixed bug which sometimes killed timer
  18  *          Steve Whitehouse : Multiple ifaddr support
  19  *          Steve Whitehouse : SIOCGIFCONF is now a compile time option
  20  *          Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
  21  *          Steve Whitehouse : Removed timer1 - it's a user space issue now
  22  *         Patrick Caulfield : Fixed router hello message format
  23  *          Steve Whitehouse : Got rid of constant sizes for blksize for
  24  *                             devices. All mtu based now.
  25  */
  26
  27 #include <linux/config.h>
  28 #include <linux/module.h>
  29 #include <linux/moduleparam.h>
  30 #include <linux/init.h>
  31 #include <linux/net.h>
  32 #include <linux/netdevice.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/timer.h>
  36 #include <linux/string.h>
  37 #include <linux/if_arp.h>
  38 #include <linux/if_ether.h>
  39 #include <linux/skbuff.h>
  40 #include <linux/rtnetlink.h>
  41 #include <linux/sysctl.h>
  42 #include <linux/notifier.h>
  43 #include <asm/uaccess.h>
  44 #include <net/neighbour.h>
  45 #include <net/dst.h>
  46 #include <net/flow.h>
  47 #include <net/dn.h>
  48 #include <net/dn_dev.h>
  49 #include <net/dn_route.h>
  50 #include <net/dn_neigh.h>
  51 #include <net/dn_fib.h>
  52
  53 #define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
  54
  55 static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
  56 static char dn_rt_all_rt_mcast[ETH_ALEN]  = {0xAB,0x00,0x00,0x03,0x00,0x00};
  57 static char dn_hiord[ETH_ALEN]            = {0xAA,0x00,0x04,0x00,0x00,0x00};
  58 static unsigned char dn_eco_version[3]    = {0x02,0x00,0x00};
  59
  60 extern struct neigh_table dn_neigh_table;
  61
  62 /*
  63  * decnet_address is kept in network order.
  64  */
  65 dn_address decnet_address = 0;
  66
  67 static rwlock_t dndev_lock = RW_LOCK_UNLOCKED;
  68 static struct net_device *decnet_default_device;
  69 static struct notifier_block *dnaddr_chain;
  70
  71 static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
  72 static void dn_dev_delete(struct net_device *dev);
  73 static void rtmsg_ifa(int event, struct dn_ifaddr *ifa);
  74
  75 static int dn_eth_up(struct net_device *);
  76 static void dn_eth_down(struct net_device *);
  77 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  78 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  79
  80 static struct dn_dev_parms dn_dev_list[] =  {
  81 {
  82         .type =         ARPHRD_ETHER, /* Ethernet */
  83         .mode =         DN_DEV_BCAST,
  84         .state =        DN_DEV_S_RU,
  85         .t2 =           1,
  86         .t3 =           10,
  87         .name =         "ethernet",
  88         .ctl_name =     NET_DECNET_CONF_ETHER,
  89         .up =           dn_eth_up,
  90         .down =         dn_eth_down,
  91         .timer3 =       dn_send_brd_hello,
  92 },
  93 {
  94         .type =         ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
  95         .mode =         DN_DEV_BCAST,
  96         .state =        DN_DEV_S_RU,
  97         .t2 =           1,
  98         .t3 =           10,
  99         .name =         "ipgre",
 100         .ctl_name =     NET_DECNET_CONF_GRE,
 101         .timer3 =       dn_send_brd_hello,
 102 },
 103 #if 0
 104 {
 105         .type =         ARPHRD_X25, /* Bog standard X.25 */
 106         .mode =         DN_DEV_UCAST,
 107         .state =        DN_DEV_S_DS,
 108         .t2 =           1,
 109         .t3 =           120,
 110         .name =         "x25",
 111         .ctl_name =     NET_DECNET_CONF_X25,
 112         .timer3 =       dn_send_ptp_hello,
 113 },
 114 #endif
 115 #if 0
 116 {
 117         .type =         ARPHRD_PPP, /* DECnet over PPP */
 118         .mode =         DN_DEV_BCAST,
 119         .state =        DN_DEV_S_RU,
 120         .t2 =           1,
 121         .t3 =           10,
 122         .name =         "ppp",
 123         .ctl_name =     NET_DECNET_CONF_PPP,
 124         .timer3 =       dn_send_brd_hello,
 125 },
 126 #endif
 127 {
 128         .type =         ARPHRD_DDCMP, /* DECnet over DDCMP */
 129         .mode =         DN_DEV_UCAST,
 130         .state =        DN_DEV_S_DS,
 131         .t2 =           1,
 132         .t3 =           120,
 133         .name =         "ddcmp",
 134         .ctl_name =     NET_DECNET_CONF_DDCMP,
 135         .timer3 =       dn_send_ptp_hello,
 136 },
 137 {
 138         .type =         ARPHRD_LOOPBACK, /* Loopback interface - always last */
 139         .mode =         DN_DEV_BCAST,
 140         .state =        DN_DEV_S_RU,
 141         .t2 =           1,
 142         .t3 =           10,
 143         .name =         "loopback",
 144         .ctl_name =     NET_DECNET_CONF_LOOPBACK,
 145         .timer3 =       dn_send_brd_hello,
 146 }
 147 };
 148
 149 #define DN_DEV_LIST_SIZE (sizeof(dn_dev_list)/sizeof(struct dn_dev_parms))
 150
 151 #define DN_DEV_PARMS_OFFSET(x) ((int) ((char *) &((struct dn_dev_parms *)0)->x))
 152
 153 #ifdef CONFIG_SYSCTL
 154
 155 static int min_t2[] = { 1 };
 156 static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
 157 static int min_t3[] = { 1 };
 158 static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
 159
 160 static int min_priority[1];
 161 static int max_priority[] = { 127 }; /* From DECnet spec */
 162
 163 static int dn_forwarding_proc(ctl_table *, int, struct file *,
 164                         void __user *, size_t *, loff_t *);
 165 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
 166                         void __user *oldval, size_t __user *oldlenp,
 167                         void __user *newval, size_t newlen,
 168                         void **context);
 169
 170 static struct dn_dev_sysctl_table {
 171         struct ctl_table_header *sysctl_header;
 172         ctl_table dn_dev_vars[5];
 173         ctl_table dn_dev_dev[2];
 174         ctl_table dn_dev_conf_dir[2];
 175         ctl_table dn_dev_proto_dir[2];
 176         ctl_table dn_dev_root_dir[2];
 177 } dn_dev_sysctl = {
 178         NULL,
 179         {
 180         {
 181                 .ctl_name = NET_DECNET_CONF_DEV_FORWARDING,
 182                 .procname = "forwarding",
 183                 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
 184                 .maxlen = sizeof(int),
 185                 .mode = 0644,
 186                 .proc_handler = dn_forwarding_proc,
 187                 .strategy = dn_forwarding_sysctl,
 188         },
 189         {
 190                 .ctl_name = NET_DECNET_CONF_DEV_PRIORITY,
 191                 .procname = "priority",
 192                 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
 193                 .maxlen = sizeof(int),
 194                 .mode = 0644,
 195                 .proc_handler = proc_dointvec_minmax,
 196                 .strategy = sysctl_intvec,
 197                 .extra1 = &min_priority,
 198                 .extra2 = &max_priority
 199         },
 200         {
 201                 .ctl_name = NET_DECNET_CONF_DEV_T2,
 202                 .procname = "t2",
 203                 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
 204                 .maxlen = sizeof(int),
 205                 .mode = 0644,
 206                 .proc_handler = proc_dointvec_minmax,
 207                 .strategy = sysctl_intvec,
 208                 .extra1 = &min_t2,
 209                 .extra2 = &max_t2
 210         },
 211         {
 212                 .ctl_name = NET_DECNET_CONF_DEV_T3,
 213                 .procname = "t3",
 214                 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
 215                 .maxlen = sizeof(int),
 216                 .mode = 0644,
 217                 .proc_handler = proc_dointvec_minmax,
 218                 .strategy = sysctl_intvec,
 219                 .extra1 = &min_t3,
 220                 .extra2 = &max_t3
 221         },
 222         {0}
 223         },
 224         {{
 225                 .ctl_name = 0,
 226                 .procname = "",
 227                 .mode = 0555,
 228                 .child = dn_dev_sysctl.dn_dev_vars
 229         }, {0}},
 230         {{
 231                 .ctl_name = NET_DECNET_CONF,
 232                 .procname = "conf",
 233                 .mode = 0555,
 234                 .child = dn_dev_sysctl.dn_dev_dev
 235         }, {0}},
 236         {{
 237                 .ctl_name = NET_DECNET,
 238                 .procname = "decnet",
 239                 .mode = 0555,
 240                 .child = dn_dev_sysctl.dn_dev_conf_dir
 241         }, {0}},
 242         {{
 243                 .ctl_name = CTL_NET,
 244                 .procname = "net",
 245                 .mode = 0555,
 246                 .child = dn_dev_sysctl.dn_dev_proto_dir
 247         }, {0}}
 248 };
 249
 250 static inline __u16 mtu2blksize(struct net_device *dev)
 251 {
 252         u32 blksize = dev->mtu;
 253         if (blksize > 0xffff)
 254                 blksize = 0xffff;
 255
 256         if (dev->type == ARPHRD_ETHER ||
 257             dev->type == ARPHRD_PPP ||
 258             dev->type == ARPHRD_IPGRE ||
 259             dev->type == ARPHRD_LOOPBACK)
 260                 blksize -= 2;
 261
 262         return (__u16)blksize;
 263 }
 264
 265 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 266 {
 267         struct dn_dev_sysctl_table *t;
 268         int i;
 269
 270         t = kmalloc(sizeof(*t), GFP_KERNEL);
 271         if (t == NULL)
 272                 return;
 273
 274         memcpy(t, &dn_dev_sysctl, sizeof(*t));
 275
 276         for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
 277                 long offset = (long)t->dn_dev_vars[i].data;
 278                 t->dn_dev_vars[i].data = ((char *)parms) + offset;
 279                 t->dn_dev_vars[i].de = NULL;
 280         }
 281
 282         if (dev) {
 283                 t->dn_dev_dev[0].procname = dev->name;
 284                 t->dn_dev_dev[0].ctl_name = dev->ifindex;
 285         } else {
 286                 t->dn_dev_dev[0].procname = parms->name;
 287                 t->dn_dev_dev[0].ctl_name = parms->ctl_name;
 288         }
 289
 290         t->dn_dev_dev[0].child = t->dn_dev_vars;
 291         t->dn_dev_dev[0].de = NULL;
 292         t->dn_dev_conf_dir[0].child = t->dn_dev_dev;
 293         t->dn_dev_conf_dir[0].de = NULL;
 294         t->dn_dev_proto_dir[0].child = t->dn_dev_conf_dir;
 295         t->dn_dev_proto_dir[0].de = NULL;
 296         t->dn_dev_root_dir[0].child = t->dn_dev_proto_dir;
 297         t->dn_dev_root_dir[0].de = NULL;
 298         t->dn_dev_vars[0].extra1 = (void *)dev;
 299
 300         t->sysctl_header = register_sysctl_table(t->dn_dev_root_dir, 0);
 301         if (t->sysctl_header == NULL)
 302                 kfree(t);
 303         else
 304                 parms->sysctl = t;
 305 }
 306
 307 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 308 {
 309         if (parms->sysctl) {
 310                 struct dn_dev_sysctl_table *t = parms->sysctl;
 311                 parms->sysctl = NULL;
 312                 unregister_sysctl_table(t->sysctl_header);
 313                 kfree(t);
 314         }
 315 }
 316
 317 struct net_device *dn_dev_get_default(void)
 318 {
 319         struct net_device *dev;
 320         read_lock(&dndev_lock);
 321         dev = decnet_default_device;
 322         if (dev) {
 323                 if (dev->dn_ptr)
 324                         dev_hold(dev);
 325                 else
 326                         dev = NULL;
 327         }
 328         read_unlock(&dndev_lock);
 329         return dev;
 330 }
 331
 332 int dn_dev_set_default(struct net_device *dev, int force)
 333 {
 334         struct net_device *old = NULL;
 335         int rv = -EBUSY;
 336         if (!dev->dn_ptr)
 337                 return -ENODEV;
 338         write_lock(&dndev_lock);
 339         if (force || decnet_default_device == NULL) {
 340                 old = decnet_default_device;
 341                 decnet_default_device = dev;
 342                 rv = 0;
 343         }
 344         write_unlock(&dndev_lock);
 345         if (old)
 346                 dev_put(dev);
 347         return rv;
 348 }
 349
 350 static void dn_dev_check_default(struct net_device *dev)
 351 {
 352         write_lock(&dndev_lock);
 353         if (dev == decnet_default_device) {
 354                 decnet_default_device = NULL;
 355         } else {
 356                 dev = NULL;
 357         }
 358         write_unlock(&dndev_lock);
 359         if (dev)
 360                 dev_put(dev);
 361 }
 362
 363 static int dn_forwarding_proc(ctl_table *table, int write,
 364                                 struct file *filep,
 365                                 void __user *buffer,
 366                                 size_t *lenp, loff_t *ppos)
 367 {
 368 #ifdef CONFIG_DECNET_ROUTER
 369         struct net_device *dev = table->extra1;
 370         struct dn_dev *dn_db;
 371         int err;
 372         int tmp, old;
 373
 374         if (table->extra1 == NULL)
 375                 return -EINVAL;
 376
 377         dn_db = dev->dn_ptr;
 378         old = dn_db->parms.forwarding;
 379
 380         err = proc_dointvec(table, write, filep, buffer, lenp, ppos);
 381
 382         if ((err >= 0) && write) {
 383                 if (dn_db->parms.forwarding < 0)
 384                         dn_db->parms.forwarding = 0;
 385                 if (dn_db->parms.forwarding > 2)
 386                         dn_db->parms.forwarding = 2;
 387                 /*
 388                  * What an ugly hack this is... its works, just. It
 389                  * would be nice if sysctl/proc were just that little
 390                  * bit more flexible so I don't have to write a special
 391                  * routine, or suffer hacks like this - SJW
 392                  */
 393                 tmp = dn_db->parms.forwarding;
 394                 dn_db->parms.forwarding = old;
 395                 if (dn_db->parms.down)
 396                         dn_db->parms.down(dev);
 397                 dn_db->parms.forwarding = tmp;
 398                 if (dn_db->parms.up)
 399                         dn_db->parms.up(dev);
 400         }
 401
 402         return err;
 403 #else
 404         return -EINVAL;
 405 #endif
 406 }
 407
 408 static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
 409                         void __user *oldval, size_t __user *oldlenp,
 410                         void __user *newval, size_t newlen,
 411                         void **context)
 412 {
 413 #ifdef CONFIG_DECNET_ROUTER
 414         struct net_device *dev = table->extra1;
 415         struct dn_dev *dn_db;
 416         int value;
 417
 418         if (table->extra1 == NULL)
 419                 return -EINVAL;
 420
 421         dn_db = dev->dn_ptr;
 422
 423         if (newval && newlen) {
 424                 if (newlen != sizeof(int))
 425                         return -EINVAL;
 426
 427                 if (get_user(value, (int __user *)newval))
 428                         return -EFAULT;
 429                 if (value < 0)
 430                         return -EINVAL;
 431                 if (value > 2)
 432                         return -EINVAL;
 433
 434                 if (dn_db->parms.down)
 435                         dn_db->parms.down(dev);
 436                 dn_db->parms.forwarding = value;
 437                 if (dn_db->parms.up)
 438                         dn_db->parms.up(dev);
 439         }
 440
 441         return 0;
 442 #else
 443         return -EINVAL;
 444 #endif
 445 }
 446
 447 #else /* CONFIG_SYSCTL */
 448 static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 449 {
 450 }
 451 static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 452 {
 453 }
 454
 455 #endif /* CONFIG_SYSCTL */
 456
 457 static struct dn_ifaddr *dn_dev_alloc_ifa(void)
 458 {
 459         struct dn_ifaddr *ifa;
 460
 461         ifa = kmalloc(sizeof(*ifa), GFP_KERNEL);
 462
 463         if (ifa) {
 464                 memset(ifa, 0, sizeof(*ifa));
 465         }
 466
 467         return ifa;
 468 }
 469
 470 static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
 471 {
 472         kfree(ifa);
 473 }
 474
 475 static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
 476 {
 477         struct dn_ifaddr *ifa1 = *ifap;
 478         unsigned char mac_addr[6];
 479         struct net_device *dev = dn_db->dev;
 480
 481         ASSERT_RTNL();
 482
 483         *ifap = ifa1->ifa_next;
 484
 485         if (dn_db->dev->type == ARPHRD_ETHER) {
 486                 if (ifa1->ifa_local != dn_htons(dn_eth2dn(dev->dev_addr))) {
 487                         dn_dn2eth(mac_addr, ifa1->ifa_local);
 488                         dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
 489                 }
 490         }
 491
 492         rtmsg_ifa(RTM_DELADDR, ifa1);
 493         notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
 494         if (destroy) {
 495                 dn_dev_free_ifa(ifa1);
 496
 497                 if (dn_db->ifa_list == NULL)
 498                         dn_dev_delete(dn_db->dev);
 499         }
 500 }
 501
 502 static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 503 {
 504         struct net_device *dev = dn_db->dev;
 505         struct dn_ifaddr *ifa1;
 506         unsigned char mac_addr[6];
 507
 508         ASSERT_RTNL();
 509
 510         /* Check for duplicates */
 511         for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
 512                 if (ifa1->ifa_local == ifa->ifa_local)
 513                         return -EEXIST;
 514         }
 515
 516         if (dev->type == ARPHRD_ETHER) {
 517                 if (ifa->ifa_local != dn_htons(dn_eth2dn(dev->dev_addr))) {
 518                         dn_dn2eth(mac_addr, ifa->ifa_local);
 519                         dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
 520                         dev_mc_upload(dev);
 521                 }
 522         }
 523
 524         ifa->ifa_next = dn_db->ifa_list;
 525         dn_db->ifa_list = ifa;
 526
 527         rtmsg_ifa(RTM_NEWADDR, ifa);
 528         notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
 529
 530         return 0;
 531 }
 532
 533 static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
 534 {
 535         struct dn_dev *dn_db = dev->dn_ptr;
 536         int rv;
 537
 538         if (dn_db == NULL) {
 539                 int err;
 540                 dn_db = dn_dev_create(dev, &err);
 541                 if (dn_db == NULL)
 542                         return err;
 543         }
 544
 545         ifa->ifa_dev = dn_db;
 546
 547         if (dev->flags & IFF_LOOPBACK)
 548                 ifa->ifa_scope = RT_SCOPE_HOST;
 549
 550         rv = dn_dev_insert_ifa(dn_db, ifa);
 551         if (rv)
 552                 dn_dev_free_ifa(ifa);
 553         return rv;
 554 }
 555
 556
 557 int dn_dev_ioctl(unsigned int cmd, void __user *arg)
 558 {
 559         char buffer[DN_IFREQ_SIZE];
 560         struct ifreq *ifr = (struct ifreq *)buffer;
 561         struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
 562         struct dn_dev *dn_db;
 563         struct net_device *dev;
 564         struct dn_ifaddr *ifa = NULL, **ifap = NULL;
 565         int ret = 0;
 566
 567         if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
 568                 return -EFAULT;
 569         ifr->ifr_name[IFNAMSIZ-1] = 0;
 570
 571 #ifdef CONFIG_KMOD
 572         dev_load(ifr->ifr_name);
 573 #endif
 574
 575         switch(cmd) {
 576                 case SIOCGIFADDR:
 577                         break;
 578                 case SIOCSIFADDR:
 579                         if (!capable(CAP_NET_ADMIN))
 580                                 return -EACCES;
 581                         if (sdn->sdn_family != AF_DECnet)
 582                                 return -EINVAL;
 583                         break;
 584                 default:
 585                         return -EINVAL;
 586         }
 587
 588         rtnl_lock();
 589
 590         if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL) {
 591                 ret = -ENODEV;
 592                 goto done;
 593         }
 594
 595         if ((dn_db = dev->dn_ptr) != NULL) {
 596                 for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
 597                         if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
 598                                 break;
 599         }
 600
 601         if (ifa == NULL && cmd != SIOCSIFADDR) {
 602                 ret = -EADDRNOTAVAIL;
 603                 goto done;
 604         }
 605
 606         switch(cmd) {
 607                 case SIOCGIFADDR:
 608                         *((dn_address *)sdn->sdn_nodeaddr) = ifa->ifa_local;
 609                         goto rarok;
 610
 611                 case SIOCSIFADDR:
 612                         if (!ifa) {
 613                                 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
 614                                         ret = -ENOBUFS;
 615                                         break;
 616                                 }
 617                                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 618                         } else {
 619                                 if (ifa->ifa_local == dn_saddr2dn(sdn))
 620                                         break;
 621                                 dn_dev_del_ifa(dn_db, ifap, 0);
 622                         }
 623
 624                         ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
 625
 626                         ret = dn_dev_set_ifa(dev, ifa);
 627         }
 628 done:
 629         rtnl_unlock();
 630
 631         return ret;
 632 rarok:
 633         if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
 634                 ret = -EFAULT;
 635         goto done;
 636 }
 637
 638 static struct dn_dev *dn_dev_by_index(int ifindex)
 639 {
 640         struct net_device *dev;
 641         struct dn_dev *dn_dev = NULL;
 642         dev = dev_get_by_index(ifindex);
 643         if (dev) {
 644                 dn_dev = dev->dn_ptr;
 645                 dev_put(dev);
 646         }
 647
 648         return dn_dev;
 649 }
 650
 651 static int dn_dev_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 652 {
 653         struct rtattr **rta = arg;
 654         struct dn_dev *dn_db;
 655         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
 656         struct dn_ifaddr *ifa, **ifap;
 657
 658         if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
 659                 return -EADDRNOTAVAIL;
 660
 661         for(ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next) {
 662                 void *tmp = rta[IFA_LOCAL-1];
 663                 if ((tmp && memcmp(RTA_DATA(tmp), &ifa->ifa_local, 2)) ||
 664                                 (rta[IFA_LABEL-1] && strcmp(RTA_DATA(rta[IFA_LABEL-1]), ifa->ifa_label)))
 665                         continue;
 666
 667                 dn_dev_del_ifa(dn_db, ifap, 1);
 668                 return 0;
 669         }
 670
 671         return -EADDRNOTAVAIL;
 672 }
 673
 674 static int dn_dev_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 675 {
 676         struct rtattr **rta = arg;
 677         struct net_device *dev;
 678         struct dn_dev *dn_db;
 679         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
 680         struct dn_ifaddr *ifa;
 681         int rv;
 682
 683         if (rta[IFA_LOCAL-1] == NULL)
 684                 return -EINVAL;
 685
 686         if ((dev = __dev_get_by_index(ifm->ifa_index)) == NULL)
 687                 return -ENODEV;
 688
 689         if ((dn_db = dev->dn_ptr) == NULL) {
 690                 int err;
 691                 dn_db = dn_dev_create(dev, &err);
 692                 if (!dn_db)
 693                         return err;
 694         }
 695
 696         if ((ifa = dn_dev_alloc_ifa()) == NULL)
 697                 return -ENOBUFS;
 698
 699         if (!rta[IFA_ADDRESS - 1])
 700                 rta[IFA_ADDRESS - 1] = rta[IFA_LOCAL - 1];
 701         memcpy(&ifa->ifa_local, RTA_DATA(rta[IFA_LOCAL-1]), 2);
 702         memcpy(&ifa->ifa_address, RTA_DATA(rta[IFA_ADDRESS-1]), 2);
 703         ifa->ifa_flags = ifm->ifa_flags;
 704         ifa->ifa_scope = ifm->ifa_scope;
 705         ifa->ifa_dev = dn_db;
 706         if (rta[IFA_LABEL-1])
 707                 memcpy(ifa->ifa_label, RTA_DATA(rta[IFA_LABEL-1]), IFNAMSIZ);
 708         else
 709                 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 710
 711         rv = dn_dev_insert_ifa(dn_db, ifa);
 712         if (rv)
 713                 dn_dev_free_ifa(ifa);
 714         return rv;
 715 }
 716
 717 static int dn_dev_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
 718                                 u32 pid, u32 seq, int event)
 719 {
 720         struct ifaddrmsg *ifm;
 721         struct nlmsghdr *nlh;
 722         unsigned char *b = skb->tail;
 723
 724         nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*ifm));
 725         ifm = NLMSG_DATA(nlh);
 726
 727         ifm->ifa_family = AF_DECnet;
 728         ifm->ifa_prefixlen = 16;
 729         ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
 730         ifm->ifa_scope = ifa->ifa_scope;
 731         ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
 732         if (ifa->ifa_address)
 733                 RTA_PUT(skb, IFA_ADDRESS, 2, &ifa->ifa_address);
 734         if (ifa->ifa_local)
 735                 RTA_PUT(skb, IFA_LOCAL, 2, &ifa->ifa_local);
 736         if (ifa->ifa_label[0])
 737                 RTA_PUT(skb, IFA_LABEL, IFNAMSIZ, &ifa->ifa_label);
 738         nlh->nlmsg_len = skb->tail - b;
 739         return skb->len;
 740
 741 nlmsg_failure:
 742 rtattr_failure:
 743         skb_trim(skb, b - skb->data);
 744         return -1;
 745 }
 746
 747 static void rtmsg_ifa(int event, struct dn_ifaddr *ifa)
 748 {
 749         struct sk_buff *skb;
 750         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
 751
 752         skb = alloc_skb(size, GFP_KERNEL);
 753         if (!skb) {
 754                 netlink_set_err(rtnl, 0, RTMGRP_DECnet_IFADDR, ENOBUFS);
 755                 return;
 756         }
 757         if (dn_dev_fill_ifaddr(skb, ifa, 0, 0, event) < 0) {
 758                 kfree_skb(skb);
 759                 netlink_set_err(rtnl, 0, RTMGRP_DECnet_IFADDR, EINVAL);
 760                 return;
 761         }
 762         NETLINK_CB(skb).dst_groups = RTMGRP_DECnet_IFADDR;
 763         netlink_broadcast(rtnl, skb, 0, RTMGRP_DECnet_IFADDR, GFP_KERNEL);
 764 }
 765
 766 static int dn_dev_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 767 {
 768         int idx, dn_idx;
 769         int s_idx, s_dn_idx;
 770         struct net_device *dev;
 771         struct dn_dev *dn_db;
 772         struct dn_ifaddr *ifa;
 773
 774         s_idx = cb->args[0];
 775         s_dn_idx = dn_idx = cb->args[1];
 776         read_lock(&dev_base_lock);
 777         for(dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
 778                 if (idx < s_idx)
 779                         continue;
 780                 if (idx > s_idx)
 781                         s_dn_idx = 0;
 782                 if ((dn_db = dev->dn_ptr) == NULL)
 783                         continue;
 784
 785                 for(ifa = dn_db->ifa_list, dn_idx = 0; ifa; ifa = ifa->ifa_next, dn_idx++) {
 786                         if (dn_idx < s_dn_idx)
 787                                 continue;
 788
 789                         if (dn_dev_fill_ifaddr(skb, ifa,
 790                                                NETLINK_CB(cb->skb).pid,
 791                                                cb->nlh->nlmsg_seq,
 792                                                RTM_NEWADDR) <= 0)
 793                                 goto done;
 794                 }
 795         }
 796 done:
 797         read_unlock(&dev_base_lock);
 798         cb->args[0] = idx;
 799         cb->args[1] = dn_idx;
 800
 801         return skb->len;
 802 }
 803
 804 static int dn_dev_get_first(struct net_device *dev, dn_address *addr)
 805 {
 806         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 807         struct dn_ifaddr *ifa;
 808         int rv = -ENODEV;
 809         if (dn_db == NULL)
 810                 goto out;
 811         ifa = dn_db->ifa_list;
 812         if (ifa != NULL) {
 813                 *addr = ifa->ifa_local;
 814                 rv = 0;
 815         }
 816 out:
 817         return rv;
 818 }
 819
 820 /*
 821  * Find a default address to bind to.
 822  *
 823  * This is one of those areas where the initial VMS concepts don't really
 824  * map onto the Linux concepts, and since we introduced multiple addresses
 825  * per interface we have to cope with slightly odd ways of finding out what
 826  * "our address" really is. Mostly it's not a problem; for this we just guess
 827  * a sensible default. Eventually the routing code will take care of all the
 828  * nasties for us I hope.
 829  */
 830 int dn_dev_bind_default(dn_address *addr)
 831 {
 832         struct net_device *dev;
 833         int rv;
 834         dev = dn_dev_get_default();
 835 last_chance:
 836         if (dev) {
 837                 read_lock(&dev_base_lock);
 838                 rv = dn_dev_get_first(dev, addr);
 839                 read_unlock(&dev_base_lock);
 840                 dev_put(dev);
 841                 if (rv == 0 || dev == &loopback_dev)
 842                         return rv;
 843         }
 844         dev = &loopback_dev;
 845         dev_hold(dev);
 846         goto last_chance;
 847 }
 848
 849 static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 850 {
 851         struct endnode_hello_message *msg;
 852         struct sk_buff *skb = NULL;
 853         unsigned short int *pktlen;
 854         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 855
 856         if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
 857                 return;
 858
 859         skb->dev = dev;
 860
 861         msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
 862
 863         msg->msgflg  = 0x0D;
 864         memcpy(msg->tiver, dn_eco_version, 3);
 865         dn_dn2eth(msg->id, ifa->ifa_local);
 866         msg->iinfo   = DN_RT_INFO_ENDN;
 867         msg->blksize = dn_htons(mtu2blksize(dev));
 868         msg->area    = 0x00;
 869         memset(msg->seed, 0, 8);
 870         memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
 871
 872         if (dn_db->router) {
 873                 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 874                 dn_dn2eth(msg->neighbor, dn->addr);
 875         }
 876
 877         msg->timer   = dn_htons((unsigned short)dn_db->parms.t3);
 878         msg->mpd     = 0x00;
 879         msg->datalen = 0x02;
 880         memset(msg->data, 0xAA, 2);
 881
 882         pktlen = (unsigned short *)skb_push(skb,2);
 883         *pktlen = dn_htons(skb->len - 2);
 884
 885         skb->nh.raw = skb->data;
 886
 887         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
 888 }
 889
 890
 891 #define DRDELAY (5 * HZ)
 892
 893 static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 894 {
 895         /* First check time since device went up */
 896         if ((jiffies - dn_db->uptime) < DRDELAY)
 897                 return 0;
 898
 899         /* If there is no router, then yes... */
 900         if (!dn_db->router)
 901                 return 1;
 902
 903         /* otherwise only if we have a higher priority or.. */
 904         if (dn->priority < dn_db->parms.priority)
 905                 return 1;
 906
 907         /* if we have equal priority and a higher node number */
 908         if (dn->priority != dn_db->parms.priority)
 909                 return 0;
 910
 911         if (dn_ntohs(dn->addr) < dn_ntohs(ifa->ifa_local))
 912                 return 1;
 913
 914         return 0;
 915 }
 916
 917 static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 918 {
 919         int n;
 920         struct dn_dev *dn_db = dev->dn_ptr;
 921         struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 922         struct sk_buff *skb;
 923         size_t size;
 924         unsigned char *ptr;
 925         unsigned char *i1, *i2;
 926         unsigned short *pktlen;
 927         char *src;
 928
 929         if (mtu2blksize(dev) < (26 + 7))
 930                 return;
 931
 932         n = mtu2blksize(dev) - 26;
 933         n /= 7;
 934
 935         if (n > 32)
 936                 n = 32;
 937
 938         size = 2 + 26 + 7 * n;
 939
 940         if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
 941                 return;
 942
 943         skb->dev = dev;
 944         ptr = skb_put(skb, size);
 945
 946         *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
 947         *ptr++ = 2; /* ECO */
 948         *ptr++ = 0;
 949         *ptr++ = 0;
 950         dn_dn2eth(ptr, ifa->ifa_local);
 951         src = ptr;
 952         ptr += ETH_ALEN;
 953         *ptr++ = dn_db->parms.forwarding == 1 ?
 954                         DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
 955         *((unsigned short *)ptr) = dn_htons(mtu2blksize(dev));
 956         ptr += 2;
 957         *ptr++ = dn_db->parms.priority; /* Priority */
 958         *ptr++ = 0; /* Area: Reserved */
 959         *((unsigned short *)ptr) = dn_htons((unsigned short)dn_db->parms.t3);
 960         ptr += 2;
 961         *ptr++ = 0; /* MPD: Reserved */
 962         i1 = ptr++;
 963         memset(ptr, 0, 7); /* Name: Reserved */
 964         ptr += 7;
 965         i2 = ptr++;
 966
 967         n = dn_neigh_elist(dev, ptr, n);
 968
 969         *i2 = 7 * n;
 970         *i1 = 8 + *i2;
 971
 972         skb_trim(skb, (27 + *i2));
 973
 974         pktlen = (unsigned short *)skb_push(skb, 2);
 975         *pktlen = dn_htons(skb->len - 2);
 976
 977         skb->nh.raw = skb->data;
 978
 979         if (dn_am_i_a_router(dn, dn_db, ifa)) {
 980                 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
 981                 if (skb2) {
 982                         dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
 983                 }
 984         }
 985
 986         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
 987 }
 988
 989 static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 990 {
 991         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
 992
 993         if (dn_db->parms.forwarding == 0)
 994                 dn_send_endnode_hello(dev, ifa);
 995         else
 996                 dn_send_router_hello(dev, ifa);
 997 }
 998
 999 static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
1000 {
1001         int tdlen = 16;
1002         int size = dev->hard_header_len + 2 + 4 + tdlen;
1003         struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
1004         int i;
1005         unsigned char *ptr;
1006         char src[ETH_ALEN];
1007
1008         if (skb == NULL)
1009                 return ;
1010
1011         skb->dev = dev;
1012         skb_push(skb, dev->hard_header_len);
1013         ptr = skb_put(skb, 2 + 4 + tdlen);
1014
1015         *ptr++ = DN_RT_PKT_HELO;
1016         *((dn_address *)ptr) = ifa->ifa_local;
1017         ptr += 2;
1018         *ptr++ = tdlen;
1019
1020         for(i = 0; i < tdlen; i++)
1021                 *ptr++ = 0252;
1022
1023         dn_dn2eth(src, ifa->ifa_local);
1024         dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1025 }
1026
1027 static int dn_eth_up(struct net_device *dev)
1028 {
1029         struct dn_dev *dn_db = dev->dn_ptr;
1030
1031         if (dn_db->parms.forwarding == 0)
1032                 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1033         else
1034                 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1035
1036         dev_mc_upload(dev);
1037
1038         dn_db->use_long = 1;
1039
1040         return 0;
1041 }
1042
1043 static void dn_eth_down(struct net_device *dev)
1044 {
1045         struct dn_dev *dn_db = dev->dn_ptr;
1046
1047         if (dn_db->parms.forwarding == 0)
1048                 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1049         else
1050                 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1051 }
1052
1053 static void dn_dev_set_timer(struct net_device *dev);
1054
1055 static void dn_dev_timer_func(unsigned long arg)
1056 {
1057         struct net_device *dev = (struct net_device *)arg;
1058         struct dn_dev *dn_db = dev->dn_ptr;
1059         struct dn_ifaddr *ifa;
1060
1061         if (dn_db->t3 <= dn_db->parms.t2) {
1062                 if (dn_db->parms.timer3) {
1063                         for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1064                                 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1065                                         dn_db->parms.timer3(dev, ifa);
1066                         }
1067                 }
1068                 dn_db->t3 = dn_db->parms.t3;
1069         } else {
1070                 dn_db->t3 -= dn_db->parms.t2;
1071         }
1072
1073         dn_dev_set_timer(dev);
1074 }
1075
1076 static void dn_dev_set_timer(struct net_device *dev)
1077 {
1078         struct dn_dev *dn_db = dev->dn_ptr;
1079
1080         if (dn_db->parms.t2 > dn_db->parms.t3)
1081                 dn_db->parms.t2 = dn_db->parms.t3;
1082
1083         dn_db->timer.data = (unsigned long)dev;
1084         dn_db->timer.function = dn_dev_timer_func;
1085         dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1086
1087         add_timer(&dn_db->timer);
1088 }
1089
1090 struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1091 {
1092         int i;
1093         struct dn_dev_parms *p = dn_dev_list;
1094         struct dn_dev *dn_db;
1095
1096         for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1097                 if (p->type == dev->type)
1098                         break;
1099         }
1100
1101         *err = -ENODEV;
1102         if (i == DN_DEV_LIST_SIZE)
1103                 return NULL;
1104
1105         *err = -ENOBUFS;
1106         if ((dn_db = kmalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1107                 return NULL;
1108
1109         memset(dn_db, 0, sizeof(struct dn_dev));
1110         memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1111         dev->dn_ptr = dn_db;
1112         dn_db->dev = dev;
1113         init_timer(&dn_db->timer);
1114
1115         dn_db->uptime = jiffies;
1116         if (dn_db->parms.up) {
1117                 if (dn_db->parms.up(dev) < 0) {
1118                         dev->dn_ptr = NULL;
1119                         kfree(dn_db);
1120                         return NULL;
1121                 }
1122         }
1123
1124         dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1125
1126         dn_dev_sysctl_register(dev, &dn_db->parms);
1127
1128         dn_dev_set_timer(dev);
1129
1130         *err = 0;
1131         return dn_db;
1132 }
1133
1134
1135 /*
1136  * This processes a device up event. We only start up
1137  * the loopback device & ethernet devices with correct
1138  * MAC addreses automatically. Others must be started
1139  * specifically.
1140  *
1141  * FIXME: How should we configure the loopback address ? If we could dispense
1142  * with using decnet_address here and for autobind, it will be one less thing
1143  * for users to worry about setting up.
1144  */
1145
1146 void dn_dev_up(struct net_device *dev)
1147 {
1148         struct dn_ifaddr *ifa;
1149         dn_address addr = decnet_address;
1150         int maybe_default = 0;
1151         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1152
1153         if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1154                 return;
1155
1156         /*
1157          * Need to ensure that loopback device has a dn_db attached to it
1158          * to allow creation of neighbours against it, even though it might
1159          * not have a local address of its own. Might as well do the same for
1160          * all autoconfigured interfaces.
1161          */
1162         if (dn_db == NULL) {
1163                 int err;
1164                 dn_db = dn_dev_create(dev, &err);
1165                 if (dn_db == NULL)
1166                         return;
1167         }
1168
1169         if (dev->type == ARPHRD_ETHER) {
1170                 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1171                         return;
1172                 addr = dn_htons(dn_eth2dn(dev->dev_addr));
1173                 maybe_default = 1;
1174         }
1175
1176         if (addr == 0)
1177                 return;
1178
1179         if ((ifa = dn_dev_alloc_ifa()) == NULL)
1180                 return;
1181
1182         ifa->ifa_local = ifa->ifa_address = addr;
1183         ifa->ifa_flags = 0;
1184         ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1185         strcpy(ifa->ifa_label, dev->name);
1186
1187         dn_dev_set_ifa(dev, ifa);
1188
1189         /*
1190          * Automagically set the default device to the first automatically
1191          * configured ethernet card in the system.
1192          */
1193         if (maybe_default) {
1194                 dev_hold(dev);
1195                 if (dn_dev_set_default(dev, 0))
1196                         dev_put(dev);
1197         }
1198 }
1199
1200 static void dn_dev_delete(struct net_device *dev)
1201 {
1202         struct dn_dev *dn_db = dev->dn_ptr;
1203
1204         if (dn_db == NULL)
1205                 return;
1206
1207         del_timer_sync(&dn_db->timer);
1208         dn_dev_sysctl_unregister(&dn_db->parms);
1209         dn_dev_check_default(dev);
1210         neigh_ifdown(&dn_neigh_table, dev);
1211
1212         if (dn_db->parms.down)
1213                 dn_db->parms.down(dev);
1214
1215         dev->dn_ptr = NULL;
1216
1217         neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1218
1219         if (dn_db->router)
1220                 neigh_release(dn_db->router);
1221         if (dn_db->peer)
1222                 neigh_release(dn_db->peer);
1223
1224         kfree(dn_db);
1225 }
1226
1227 void dn_dev_down(struct net_device *dev)
1228 {
1229         struct dn_dev *dn_db = dev->dn_ptr;
1230         struct dn_ifaddr *ifa;
1231
1232         if (dn_db == NULL)
1233                 return;
1234
1235         while((ifa = dn_db->ifa_list) != NULL) {
1236                 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1237                 dn_dev_free_ifa(ifa);
1238         }
1239
1240         dn_dev_delete(dev);
1241 }
1242
1243 void dn_dev_init_pkt(struct sk_buff *skb)
1244 {
1245         return;
1246 }
1247
1248 void dn_dev_veri_pkt(struct sk_buff *skb)
1249 {
1250         return;
1251 }
1252
1253 void dn_dev_hello(struct sk_buff *skb)
1254 {
1255         return;
1256 }
1257
1258 void dn_dev_devices_off(void)
1259 {
1260         struct net_device *dev;
1261
1262         rtnl_lock();
1263         for(dev = dev_base; dev; dev = dev->next)
1264                 dn_dev_down(dev);
1265         rtnl_unlock();
1266
1267 }
1268
1269 void dn_dev_devices_on(void)
1270 {
1271         struct net_device *dev;
1272
1273         rtnl_lock();
1274         for(dev = dev_base; dev; dev = dev->next) {
1275                 if (dev->flags & IFF_UP)
1276                         dn_dev_up(dev);
1277         }
1278         rtnl_unlock();
1279 }
1280
1281 int register_dnaddr_notifier(struct notifier_block *nb)
1282 {
1283         return notifier_chain_register(&dnaddr_chain, nb);
1284 }
1285
1286 int unregister_dnaddr_notifier(struct notifier_block *nb)
1287 {
1288         return notifier_chain_unregister(&dnaddr_chain, nb);
1289 }
1290
1291 #ifdef CONFIG_DECNET_SIOCGIFCONF
1292 /*
1293  * Now we support multiple addresses per interface.
1294  * Since we don't want to break existing code, you have to enable
1295  * it as a compile time option. Probably you should use the
1296  * rtnetlink interface instead.
1297  */
1298 int dnet_gifconf(struct net_device *dev, char __user *buf, int len)
1299 {
1300         struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1301         struct dn_ifaddr *ifa;
1302         char buffer[DN_IFREQ_SIZE];
1303         struct ifreq *ifr = (struct ifreq *)buffer;
1304         struct sockaddr_dn *addr = (struct sockaddr_dn *)&ifr->ifr_addr;
1305         int done = 0;
1306
1307         if ((dn_db == NULL) || ((ifa = dn_db->ifa_list) == NULL))
1308                 return 0;
1309
1310         for(; ifa; ifa = ifa->ifa_next) {
1311                 if (!buf) {
1312                         done += sizeof(DN_IFREQ_SIZE);
1313                         continue;
1314                 }
1315                 if (len < DN_IFREQ_SIZE)
1316                         return done;
1317                 memset(buffer, 0, DN_IFREQ_SIZE);
1318
1319                 if (ifa->ifa_label)
1320                         strcpy(ifr->ifr_name, ifa->ifa_label);
1321                 else
1322                         strcpy(ifr->ifr_name, dev->name);
1323
1324                 addr->sdn_family = AF_DECnet;
1325                 addr->sdn_add.a_len = 2;
1326                 memcpy(addr->sdn_add.a_addr, &ifa->ifa_local,
1327                         sizeof(dn_address));
1328
1329                 if (copy_to_user(buf, buffer, DN_IFREQ_SIZE)) {
1330                         done = -EFAULT;
1331                         break;
1332                 }
1333
1334                 buf  += DN_IFREQ_SIZE;
1335                 len  -= DN_IFREQ_SIZE;
1336                 done += DN_IFREQ_SIZE;
1337         }
1338
1339         return done;
1340 }
1341 #endif /* CONFIG_DECNET_SIOCGIFCONF */
1342
1343
1344 #ifdef CONFIG_PROC_FS
1345 static inline struct net_device *dn_dev_get_next(struct seq_file *seq, struct net_device *dev)
1346 {
1347         do {
1348                 dev = dev->next;
1349         } while(dev && !dev->dn_ptr);
1350
1351         return dev;
1352 }
1353
1354 static struct net_device *dn_dev_get_idx(struct seq_file *seq, loff_t pos)
1355 {
1356         struct net_device *dev;
1357
1358         dev = dev_base;
1359         if (dev && !dev->dn_ptr)
1360                 dev = dn_dev_get_next(seq, dev);
1361         if (pos) {
1362                 while(dev && (dev = dn_dev_get_next(seq, dev)))
1363                         --pos;
1364         }
1365         return dev;
1366 }
1367
1368 static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1369 {
1370         if (*pos) {
1371                 struct net_device *dev;
1372                 read_lock(&dev_base_lock);
1373                 dev = dn_dev_get_idx(seq, *pos - 1);
1374                 if (dev == NULL)
1375                         read_unlock(&dev_base_lock);
1376                 return dev;
1377         }
1378         return SEQ_START_TOKEN;
1379 }
1380
1381 static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1382 {
1383         struct net_device *dev = v;
1384         loff_t one = 1;
1385
1386         if (v == SEQ_START_TOKEN) {
1387                 dev = dn_dev_seq_start(seq, &one);
1388         } else {
1389                 dev = dn_dev_get_next(seq, dev);
1390                 if (dev == NULL)
1391                         read_unlock(&dev_base_lock);
1392         }
1393         ++*pos;
1394         return dev;
1395 }
1396
1397 static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1398 {
1399         if (v && v != SEQ_START_TOKEN)
1400                 read_unlock(&dev_base_lock);
1401 }
1402
1403 static char *dn_type2asc(char type)
1404 {
1405         switch(type) {
1406                 case DN_DEV_BCAST:
1407                         return "B";
1408                 case DN_DEV_UCAST:
1409                         return "U";
1410                 case DN_DEV_MPOINT:
1411                         return "M";
1412         }
1413
1414         return "?";
1415 }
1416
1417 static int dn_dev_seq_show(struct seq_file *seq, void *v)
1418 {
1419         if (v == SEQ_START_TOKEN)
1420                 seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1421         else {
1422                 struct net_device *dev = v;
1423                 char peer_buf[DN_ASCBUF_LEN];
1424                 char router_buf[DN_ASCBUF_LEN];
1425                 struct dn_dev *dn_db = dev->dn_ptr;
1426
1427                 seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1428                                 "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1429                                 dev->name ? dev->name : "???",
1430                                 dn_type2asc(dn_db->parms.mode),
1431                                 0, 0,
1432                                 dn_db->t3, dn_db->parms.t3,
1433                                 mtu2blksize(dev),
1434                                 dn_db->parms.priority,
1435                                 dn_db->parms.state, dn_db->parms.name,
1436                                 dn_db->router ? dn_addr2asc(dn_ntohs(*(dn_address *)dn_db->router->primary_key), router_buf) : "",
1437                                 dn_db->peer ? dn_addr2asc(dn_ntohs(*(dn_address *)dn_db->peer->primary_key), peer_buf) : "");
1438         }
1439         return 0;
1440 }
1441
1442 static struct seq_operations dn_dev_seq_ops = {
1443         .start  = dn_dev_seq_start,
1444         .next   = dn_dev_seq_next,
1445         .stop   = dn_dev_seq_stop,
1446         .show   = dn_dev_seq_show,
1447 };
1448
1449 static int dn_dev_seq_open(struct inode *inode, struct file *file)
1450 {
1451         return seq_open(file, &dn_dev_seq_ops);
1452 }
1453
1454 static struct file_operations dn_dev_seq_fops = {
1455         .owner   = THIS_MODULE,
1456         .open    = dn_dev_seq_open,
1457         .read    = seq_read,
1458         .llseek  = seq_lseek,
1459         .release = seq_release,
1460 };
1461
1462 #endif /* CONFIG_PROC_FS */
1463
1464 static struct rtnetlink_link dnet_rtnetlink_table[RTM_MAX-RTM_BASE+1] =
1465 {
1466          [4] = { .doit   = dn_dev_rtm_newaddr,  },
1467          [5] = { .doit   = dn_dev_rtm_deladdr,  },
1468          [6] = { .dumpit = dn_dev_dump_ifaddr,  },
1469
1470 #ifdef CONFIG_DECNET_ROUTER
1471          [8] = { .doit   = dn_fib_rtm_newroute, },
1472          [9] = { .doit   = dn_fib_rtm_delroute, },
1473         [10] = { .doit   = dn_cache_getroute, .dumpit = dn_fib_dump, },
1474         [16] = { .doit   = dn_fib_rtm_newrule, },
1475         [17] = { .doit   = dn_fib_rtm_delrule, },
1476         [18] = { .dumpit = dn_fib_dump_rules,  },
1477 #else
1478         [10] = { .doit   = dn_cache_getroute, .dumpit = dn_cache_dump, },
1479 #endif
1480
1481 };
1482
1483 static int __initdata addr[2];
1484 static int __initdata num;
1485 module_param_array(addr, int, num, 0444);
1486 MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1487
1488 void __init dn_dev_init(void)
1489 {
1490         if (addr[0] > 63 || addr[0] < 0) {
1491                 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1492                 return;
1493         }
1494
1495         if (addr[1] > 1023 || addr[1] < 0) {
1496                 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1497                 return;
1498         }
1499
1500         decnet_address = dn_htons((addr[0] << 10) | addr[1]);
1501
1502         dn_dev_devices_on();
1503 #ifdef CONFIG_DECNET_SIOCGIFCONF
1504         register_gifconf(PF_DECnet, dnet_gifconf);
1505 #endif /* CONFIG_DECNET_SIOCGIFCONF */
1506
1507         rtnetlink_links[PF_DECnet] = dnet_rtnetlink_table;
1508
1509         proc_net_fops_create("decnet_dev", S_IRUGO, &dn_dev_seq_fops);
1510
1511 #ifdef CONFIG_SYSCTL
1512         {
1513                 int i;
1514                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1515                         dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1516         }
1517 #endif /* CONFIG_SYSCTL */
1518 }
1519
1520 void __exit dn_dev_cleanup(void)
1521 {
1522         rtnetlink_links[PF_DECnet] = NULL;
1523
1524 #ifdef CONFIG_DECNET_SIOCGIFCONF
1525         unregister_gifconf(PF_DECnet);
1526 #endif /* CONFIG_DECNET_SIOCGIFCONF */
1527
1528 #ifdef CONFIG_SYSCTL
1529         {
1530                 int i;
1531                 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1532                         dn_dev_sysctl_unregister(&dn_dev_list[i]);
1533         }
1534 #endif /* CONFIG_SYSCTL */
1535
1536         proc_net_remove("decnet_dev");
1537
1538         dn_dev_devices_off();
1539 }