linux/net/decnet/dn_dev.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * DECnet       An implementation of the DECnet protocol suite for the LINUX
   4 *              operating system.  DECnet is implemented using the  BSD Socket
   5 *              interface as the means of communication with the user level.
   6 *
   7 *              DECnet Device Layer
   8 *
   9 * Authors:     Steve Whitehouse <SteveW@ACM.org>
  10 *              Eduardo Marcelo Serrat <emserrat@geocities.com>
  11 *
  12 * Changes:
  13 *          Steve Whitehouse : Devices now see incoming frames so they
  14 *                             can mark on who it came from.
  15 *          Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
  16 *                             can now have a device specific setup func.
  17 *          Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
  18 *          Steve Whitehouse : Fixed bug which sometimes killed timer
  19 *          Steve Whitehouse : Multiple ifaddr support
  20 *          Steve Whitehouse : SIOCGIFCONF is now a compile time option
  21 *          Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
  22 *          Steve Whitehouse : Removed timer1 - it's a user space issue now
  23 *         Patrick Caulfield : Fixed router hello message format
  24 *          Steve Whitehouse : Got rid of constant sizes for blksize for
  25 *                             devices. All mtu based now.
  26 */
  27
  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_addr.h>
  39#include <linux/if_arp.h>
  40#include <linux/if_ether.h>
  41#include <linux/skbuff.h>
  42#include <linux/sysctl.h>
  43#include <linux/notifier.h>
  44#include <linux/slab.h>
  45#include <linux/jiffies.h>
  46#include <linux/uaccess.h>
  47#include <net/net_namespace.h>
  48#include <net/neighbour.h>
  49#include <net/dst.h>
  50#include <net/flow.h>
  51#include <net/fib_rules.h>
  52#include <net/netlink.h>
  53#include <net/dn.h>
  54#include <net/dn_dev.h>
  55#include <net/dn_route.h>
  56#include <net/dn_neigh.h>
  57#include <net/dn_fib.h>
  58
  59#define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
  60
  61static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
  62static char dn_rt_all_rt_mcast[ETH_ALEN]  = {0xAB,0x00,0x00,0x03,0x00,0x00};
  63static char dn_hiord[ETH_ALEN]            = {0xAA,0x00,0x04,0x00,0x00,0x00};
  64static unsigned char dn_eco_version[3]    = {0x02,0x00,0x00};
  65
  66extern struct neigh_table dn_neigh_table;
  67
  68/*
  69 * decnet_address is kept in network order.
  70 */
  71__le16 decnet_address = 0;
  72
  73static DEFINE_SPINLOCK(dndev_lock);
  74static struct net_device *decnet_default_device;
  75static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
  76
  77static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
  78static void dn_dev_delete(struct net_device *dev);
  79static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
  80
  81static int dn_eth_up(struct net_device *);
  82static void dn_eth_down(struct net_device *);
  83static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  84static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
  85
  86static struct dn_dev_parms dn_dev_list[] =  {
  87{
  88        .type =         ARPHRD_ETHER, /* Ethernet */
  89        .mode =         DN_DEV_BCAST,
  90        .state =        DN_DEV_S_RU,
  91        .t2 =           1,
  92        .t3 =           10,
  93        .name =         "ethernet",
  94        .up =           dn_eth_up,
  95        .down =         dn_eth_down,
  96        .timer3 =       dn_send_brd_hello,
  97},
  98{
  99        .type =         ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
 100        .mode =         DN_DEV_BCAST,
 101        .state =        DN_DEV_S_RU,
 102        .t2 =           1,
 103        .t3 =           10,
 104        .name =         "ipgre",
 105        .timer3 =       dn_send_brd_hello,
 106},
 107#if 0
 108{
 109        .type =         ARPHRD_X25, /* Bog standard X.25 */
 110        .mode =         DN_DEV_UCAST,
 111        .state =        DN_DEV_S_DS,
 112        .t2 =           1,
 113        .t3 =           120,
 114        .name =         "x25",
 115        .timer3 =       dn_send_ptp_hello,
 116},
 117#endif
 118#if 0
 119{
 120        .type =         ARPHRD_PPP, /* DECnet over PPP */
 121        .mode =         DN_DEV_BCAST,
 122        .state =        DN_DEV_S_RU,
 123        .t2 =           1,
 124        .t3 =           10,
 125        .name =         "ppp",
 126        .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        .timer3 =       dn_send_ptp_hello,
 137},
 138{
 139        .type =         ARPHRD_LOOPBACK, /* Loopback interface - always last */
 140        .mode =         DN_DEV_BCAST,
 141        .state =        DN_DEV_S_RU,
 142        .t2 =           1,
 143        .t3 =           10,
 144        .name =         "loopback",
 145        .timer3 =       dn_send_brd_hello,
 146}
 147};
 148
 149#define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
 150
 151#define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
 152
 153#ifdef CONFIG_SYSCTL
 154
 155static int min_t2[] = { 1 };
 156static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
 157static int min_t3[] = { 1 };
 158static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
 159
 160static int min_priority[1];
 161static int max_priority[] = { 127 }; /* From DECnet spec */
 162
 163static int dn_forwarding_proc(struct ctl_table *, int,
 164                        void __user *, size_t *, loff_t *);
 165static struct dn_dev_sysctl_table {
 166        struct ctl_table_header *sysctl_header;
 167        struct ctl_table dn_dev_vars[5];
 168} dn_dev_sysctl = {
 169        NULL,
 170        {
 171        {
 172                .procname = "forwarding",
 173                .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
 174                .maxlen = sizeof(int),
 175                .mode = 0644,
 176                .proc_handler = dn_forwarding_proc,
 177        },
 178        {
 179                .procname = "priority",
 180                .data = (void *)DN_DEV_PARMS_OFFSET(priority),
 181                .maxlen = sizeof(int),
 182                .mode = 0644,
 183                .proc_handler = proc_dointvec_minmax,
 184                .extra1 = &min_priority,
 185                .extra2 = &max_priority
 186        },
 187        {
 188                .procname = "t2",
 189                .data = (void *)DN_DEV_PARMS_OFFSET(t2),
 190                .maxlen = sizeof(int),
 191                .mode = 0644,
 192                .proc_handler = proc_dointvec_minmax,
 193                .extra1 = &min_t2,
 194                .extra2 = &max_t2
 195        },
 196        {
 197                .procname = "t3",
 198                .data = (void *)DN_DEV_PARMS_OFFSET(t3),
 199                .maxlen = sizeof(int),
 200                .mode = 0644,
 201                .proc_handler = proc_dointvec_minmax,
 202                .extra1 = &min_t3,
 203                .extra2 = &max_t3
 204        },
 205        { }
 206        },
 207};
 208
 209static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 210{
 211        struct dn_dev_sysctl_table *t;
 212        int i;
 213
 214        char path[sizeof("net/decnet/conf/") + IFNAMSIZ];
 215
 216        t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
 217        if (t == NULL)
 218                return;
 219
 220        for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
 221                long offset = (long)t->dn_dev_vars[i].data;
 222                t->dn_dev_vars[i].data = ((char *)parms) + offset;
 223        }
 224
 225        snprintf(path, sizeof(path), "net/decnet/conf/%s",
 226                dev? dev->name : parms->name);
 227
 228        t->dn_dev_vars[0].extra1 = (void *)dev;
 229
 230        t->sysctl_header = register_net_sysctl(&init_net, path, t->dn_dev_vars);
 231        if (t->sysctl_header == NULL)
 232                kfree(t);
 233        else
 234                parms->sysctl = t;
 235}
 236
 237static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 238{
 239        if (parms->sysctl) {
 240                struct dn_dev_sysctl_table *t = parms->sysctl;
 241                parms->sysctl = NULL;
 242                unregister_net_sysctl_table(t->sysctl_header);
 243                kfree(t);
 244        }
 245}
 246
 247static int dn_forwarding_proc(struct ctl_table *table, int write,
 248                                void __user *buffer,
 249                                size_t *lenp, loff_t *ppos)
 250{
 251#ifdef CONFIG_DECNET_ROUTER
 252        struct net_device *dev = table->extra1;
 253        struct dn_dev *dn_db;
 254        int err;
 255        int tmp, old;
 256
 257        if (table->extra1 == NULL)
 258                return -EINVAL;
 259
 260        dn_db = rcu_dereference_raw(dev->dn_ptr);
 261        old = dn_db->parms.forwarding;
 262
 263        err = proc_dointvec(table, write, buffer, lenp, ppos);
 264
 265        if ((err >= 0) && write) {
 266                if (dn_db->parms.forwarding < 0)
 267                        dn_db->parms.forwarding = 0;
 268                if (dn_db->parms.forwarding > 2)
 269                        dn_db->parms.forwarding = 2;
 270                /*
 271                 * What an ugly hack this is... its works, just. It
 272                 * would be nice if sysctl/proc were just that little
 273                 * bit more flexible so I don't have to write a special
 274                 * routine, or suffer hacks like this - SJW
 275                 */
 276                tmp = dn_db->parms.forwarding;
 277                dn_db->parms.forwarding = old;
 278                if (dn_db->parms.down)
 279                        dn_db->parms.down(dev);
 280                dn_db->parms.forwarding = tmp;
 281                if (dn_db->parms.up)
 282                        dn_db->parms.up(dev);
 283        }
 284
 285        return err;
 286#else
 287        return -EINVAL;
 288#endif
 289}
 290
 291#else /* CONFIG_SYSCTL */
 292static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
 293{
 294}
 295static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
 296{
 297}
 298
 299#endif /* CONFIG_SYSCTL */
 300
 301static inline __u16 mtu2blksize(struct net_device *dev)
 302{
 303        u32 blksize = dev->mtu;
 304        if (blksize > 0xffff)
 305                blksize = 0xffff;
 306
 307        if (dev->type == ARPHRD_ETHER ||
 308            dev->type == ARPHRD_PPP ||
 309            dev->type == ARPHRD_IPGRE ||
 310            dev->type == ARPHRD_LOOPBACK)
 311                blksize -= 2;
 312
 313        return (__u16)blksize;
 314}
 315
 316static struct dn_ifaddr *dn_dev_alloc_ifa(void)
 317{
 318        struct dn_ifaddr *ifa;
 319
 320        ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
 321
 322        return ifa;
 323}
 324
 325static void dn_dev_free_ifa(struct dn_ifaddr *ifa)
 326{
 327        kfree_rcu(ifa, rcu);
 328}
 329
 330static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr __rcu **ifap, int destroy)
 331{
 332        struct dn_ifaddr *ifa1 = rtnl_dereference(*ifap);
 333        unsigned char mac_addr[6];
 334        struct net_device *dev = dn_db->dev;
 335
 336        ASSERT_RTNL();
 337
 338        *ifap = ifa1->ifa_next;
 339
 340        if (dn_db->dev->type == ARPHRD_ETHER) {
 341                if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
 342                        dn_dn2eth(mac_addr, ifa1->ifa_local);
 343                        dev_mc_del(dev, mac_addr);
 344                }
 345        }
 346
 347        dn_ifaddr_notify(RTM_DELADDR, ifa1);
 348        blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
 349        if (destroy) {
 350                dn_dev_free_ifa(ifa1);
 351
 352                if (dn_db->ifa_list == NULL)
 353                        dn_dev_delete(dn_db->dev);
 354        }
 355}
 356
 357static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 358{
 359        struct net_device *dev = dn_db->dev;
 360        struct dn_ifaddr *ifa1;
 361        unsigned char mac_addr[6];
 362
 363        ASSERT_RTNL();
 364
 365        /* Check for duplicates */
 366        for (ifa1 = rtnl_dereference(dn_db->ifa_list);
 367             ifa1 != NULL;
 368             ifa1 = rtnl_dereference(ifa1->ifa_next)) {
 369                if (ifa1->ifa_local == ifa->ifa_local)
 370                        return -EEXIST;
 371        }
 372
 373        if (dev->type == ARPHRD_ETHER) {
 374                if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
 375                        dn_dn2eth(mac_addr, ifa->ifa_local);
 376                        dev_mc_add(dev, mac_addr);
 377                }
 378        }
 379
 380        ifa->ifa_next = dn_db->ifa_list;
 381        rcu_assign_pointer(dn_db->ifa_list, ifa);
 382
 383        dn_ifaddr_notify(RTM_NEWADDR, ifa);
 384        blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
 385
 386        return 0;
 387}
 388
 389static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
 390{
 391        struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
 392        int rv;
 393
 394        if (dn_db == NULL) {
 395                int err;
 396                dn_db = dn_dev_create(dev, &err);
 397                if (dn_db == NULL)
 398                        return err;
 399        }
 400
 401        ifa->ifa_dev = dn_db;
 402
 403        if (dev->flags & IFF_LOOPBACK)
 404                ifa->ifa_scope = RT_SCOPE_HOST;
 405
 406        rv = dn_dev_insert_ifa(dn_db, ifa);
 407        if (rv)
 408                dn_dev_free_ifa(ifa);
 409        return rv;
 410}
 411
 412
 413int dn_dev_ioctl(unsigned int cmd, void __user *arg)
 414{
 415        char buffer[DN_IFREQ_SIZE];
 416        struct ifreq *ifr = (struct ifreq *)buffer;
 417        struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
 418        struct dn_dev *dn_db;
 419        struct net_device *dev;
 420        struct dn_ifaddr *ifa = NULL;
 421        struct dn_ifaddr __rcu **ifap = NULL;
 422        int ret = 0;
 423
 424        if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
 425                return -EFAULT;
 426        ifr->ifr_name[IFNAMSIZ-1] = 0;
 427
 428        dev_load(&init_net, ifr->ifr_name);
 429
 430        switch (cmd) {
 431        case SIOCGIFADDR:
 432                break;
 433        case SIOCSIFADDR:
 434                if (!capable(CAP_NET_ADMIN))
 435                        return -EACCES;
 436                if (sdn->sdn_family != AF_DECnet)
 437                        return -EINVAL;
 438                break;
 439        default:
 440                return -EINVAL;
 441        }
 442
 443        rtnl_lock();
 444
 445        if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
 446                ret = -ENODEV;
 447                goto done;
 448        }
 449
 450        if ((dn_db = rtnl_dereference(dev->dn_ptr)) != NULL) {
 451                for (ifap = &dn_db->ifa_list;
 452                     (ifa = rtnl_dereference(*ifap)) != NULL;
 453                     ifap = &ifa->ifa_next)
 454                        if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
 455                                break;
 456        }
 457
 458        if (ifa == NULL && cmd != SIOCSIFADDR) {
 459                ret = -EADDRNOTAVAIL;
 460                goto done;
 461        }
 462
 463        switch (cmd) {
 464        case SIOCGIFADDR:
 465                *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
 466                goto rarok;
 467
 468        case SIOCSIFADDR:
 469                if (!ifa) {
 470                        if ((ifa = dn_dev_alloc_ifa()) == NULL) {
 471                                ret = -ENOBUFS;
 472                                break;
 473                        }
 474                        memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 475                } else {
 476                        if (ifa->ifa_local == dn_saddr2dn(sdn))
 477                                break;
 478                        dn_dev_del_ifa(dn_db, ifap, 0);
 479                }
 480
 481                ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
 482
 483                ret = dn_dev_set_ifa(dev, ifa);
 484        }
 485done:
 486        rtnl_unlock();
 487
 488        return ret;
 489rarok:
 490        if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
 491                ret = -EFAULT;
 492        goto done;
 493}
 494
 495struct net_device *dn_dev_get_default(void)
 496{
 497        struct net_device *dev;
 498
 499        spin_lock(&dndev_lock);
 500        dev = decnet_default_device;
 501        if (dev) {
 502                if (dev->dn_ptr)
 503                        dev_hold(dev);
 504                else
 505                        dev = NULL;
 506        }
 507        spin_unlock(&dndev_lock);
 508
 509        return dev;
 510}
 511
 512int dn_dev_set_default(struct net_device *dev, int force)
 513{
 514        struct net_device *old = NULL;
 515        int rv = -EBUSY;
 516        if (!dev->dn_ptr)
 517                return -ENODEV;
 518
 519        spin_lock(&dndev_lock);
 520        if (force || decnet_default_device == NULL) {
 521                old = decnet_default_device;
 522                decnet_default_device = dev;
 523                rv = 0;
 524        }
 525        spin_unlock(&dndev_lock);
 526
 527        if (old)
 528                dev_put(old);
 529        return rv;
 530}
 531
 532static void dn_dev_check_default(struct net_device *dev)
 533{
 534        spin_lock(&dndev_lock);
 535        if (dev == decnet_default_device) {
 536                decnet_default_device = NULL;
 537        } else {
 538                dev = NULL;
 539        }
 540        spin_unlock(&dndev_lock);
 541
 542        if (dev)
 543                dev_put(dev);
 544}
 545
 546/*
 547 * Called with RTNL
 548 */
 549static struct dn_dev *dn_dev_by_index(int ifindex)
 550{
 551        struct net_device *dev;
 552        struct dn_dev *dn_dev = NULL;
 553
 554        dev = __dev_get_by_index(&init_net, ifindex);
 555        if (dev)
 556                dn_dev = rtnl_dereference(dev->dn_ptr);
 557
 558        return dn_dev;
 559}
 560
 561static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
 562        [IFA_ADDRESS]           = { .type = NLA_U16 },
 563        [IFA_LOCAL]             = { .type = NLA_U16 },
 564        [IFA_LABEL]             = { .type = NLA_STRING,
 565                                    .len = IFNAMSIZ - 1 },
 566        [IFA_FLAGS]             = { .type = NLA_U32 },
 567};
 568
 569static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
 570                         struct netlink_ext_ack *extack)
 571{
 572        struct net *net = sock_net(skb->sk);
 573        struct nlattr *tb[IFA_MAX+1];
 574        struct dn_dev *dn_db;
 575        struct ifaddrmsg *ifm;
 576        struct dn_ifaddr *ifa;
 577        struct dn_ifaddr __rcu **ifap;
 578        int err = -EINVAL;
 579
 580        if (!netlink_capable(skb, CAP_NET_ADMIN))
 581                return -EPERM;
 582
 583        if (!net_eq(net, &init_net))
 584                goto errout;
 585
 586        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy,
 587                          extack);
 588        if (err < 0)
 589                goto errout;
 590
 591        err = -ENODEV;
 592        ifm = nlmsg_data(nlh);
 593        if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
 594                goto errout;
 595
 596        err = -EADDRNOTAVAIL;
 597        for (ifap = &dn_db->ifa_list;
 598             (ifa = rtnl_dereference(*ifap)) != NULL;
 599             ifap = &ifa->ifa_next) {
 600                if (tb[IFA_LOCAL] &&
 601                    nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
 602                        continue;
 603
 604                if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
 605                        continue;
 606
 607                dn_dev_del_ifa(dn_db, ifap, 1);
 608                return 0;
 609        }
 610
 611errout:
 612        return err;
 613}
 614
 615static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
 616                         struct netlink_ext_ack *extack)
 617{
 618        struct net *net = sock_net(skb->sk);
 619        struct nlattr *tb[IFA_MAX+1];
 620        struct net_device *dev;
 621        struct dn_dev *dn_db;
 622        struct ifaddrmsg *ifm;
 623        struct dn_ifaddr *ifa;
 624        int err;
 625
 626        if (!netlink_capable(skb, CAP_NET_ADMIN))
 627                return -EPERM;
 628
 629        if (!net_eq(net, &init_net))
 630                return -EINVAL;
 631
 632        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy,
 633                          extack);
 634        if (err < 0)
 635                return err;
 636
 637        if (tb[IFA_LOCAL] == NULL)
 638                return -EINVAL;
 639
 640        ifm = nlmsg_data(nlh);
 641        if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
 642                return -ENODEV;
 643
 644        if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
 645                dn_db = dn_dev_create(dev, &err);
 646                if (!dn_db)
 647                        return err;
 648        }
 649
 650        if ((ifa = dn_dev_alloc_ifa()) == NULL)
 651                return -ENOBUFS;
 652
 653        if (tb[IFA_ADDRESS] == NULL)
 654                tb[IFA_ADDRESS] = tb[IFA_LOCAL];
 655
 656        ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
 657        ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
 658        ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
 659                                         ifm->ifa_flags;
 660        ifa->ifa_scope = ifm->ifa_scope;
 661        ifa->ifa_dev = dn_db;
 662
 663        if (tb[IFA_LABEL])
 664                nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
 665        else
 666                memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 667
 668        err = dn_dev_insert_ifa(dn_db, ifa);
 669        if (err)
 670                dn_dev_free_ifa(ifa);
 671
 672        return err;
 673}
 674
 675static inline size_t dn_ifaddr_nlmsg_size(void)
 676{
 677        return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
 678               + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
 679               + nla_total_size(2) /* IFA_ADDRESS */
 680               + nla_total_size(2) /* IFA_LOCAL */
 681               + nla_total_size(4); /* IFA_FLAGS */
 682}
 683
 684static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
 685                             u32 portid, u32 seq, int event, unsigned int flags)
 686{
 687        struct ifaddrmsg *ifm;
 688        struct nlmsghdr *nlh;
 689        u32 ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
 690
 691        nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
 692        if (nlh == NULL)
 693                return -EMSGSIZE;
 694
 695        ifm = nlmsg_data(nlh);
 696        ifm->ifa_family = AF_DECnet;
 697        ifm->ifa_prefixlen = 16;
 698        ifm->ifa_flags = ifa_flags;
 699        ifm->ifa_scope = ifa->ifa_scope;
 700        ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
 701
 702        if ((ifa->ifa_address &&
 703             nla_put_le16(skb, IFA_ADDRESS, ifa->ifa_address)) ||
 704            (ifa->ifa_local &&
 705             nla_put_le16(skb, IFA_LOCAL, ifa->ifa_local)) ||
 706            (ifa->ifa_label[0] &&
 707             nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
 708             nla_put_u32(skb, IFA_FLAGS, ifa_flags))
 709                goto nla_put_failure;
 710        nlmsg_end(skb, nlh);
 711        return 0;
 712
 713nla_put_failure:
 714        nlmsg_cancel(skb, nlh);
 715        return -EMSGSIZE;
 716}
 717
 718static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
 719{
 720        struct sk_buff *skb;
 721        int err = -ENOBUFS;
 722
 723        skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
 724        if (skb == NULL)
 725                goto errout;
 726
 727        err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
 728        if (err < 0) {
 729                /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
 730                WARN_ON(err == -EMSGSIZE);
 731                kfree_skb(skb);
 732                goto errout;
 733        }
 734        rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
 735        return;
 736errout:
 737        if (err < 0)
 738                rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
 739}
 740
 741static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 742{
 743        struct net *net = sock_net(skb->sk);
 744        int idx, dn_idx = 0, skip_ndevs, skip_naddr;
 745        struct net_device *dev;
 746        struct dn_dev *dn_db;
 747        struct dn_ifaddr *ifa;
 748
 749        if (!net_eq(net, &init_net))
 750                return 0;
 751
 752        skip_ndevs = cb->args[0];
 753        skip_naddr = cb->args[1];
 754
 755        idx = 0;
 756        rcu_read_lock();
 757        for_each_netdev_rcu(&init_net, dev) {
 758                if (idx < skip_ndevs)
 759                        goto cont;
 760                else if (idx > skip_ndevs) {
 761                        /* Only skip over addresses for first dev dumped
 762                         * in this iteration (idx == skip_ndevs) */
 763                        skip_naddr = 0;
 764                }
 765
 766                if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
 767                        goto cont;
 768
 769                for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
 770                     ifa = rcu_dereference(ifa->ifa_next), dn_idx++) {
 771                        if (dn_idx < skip_naddr)
 772                                continue;
 773
 774                        if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).portid,
 775                                              cb->nlh->nlmsg_seq, RTM_NEWADDR,
 776                                              NLM_F_MULTI) < 0)
 777                                goto done;
 778                }
 779cont:
 780                idx++;
 781        }
 782done:
 783        rcu_read_unlock();
 784        cb->args[0] = idx;
 785        cb->args[1] = dn_idx;
 786
 787        return skb->len;
 788}
 789
 790static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
 791{
 792        struct dn_dev *dn_db;
 793        struct dn_ifaddr *ifa;
 794        int rv = -ENODEV;
 795
 796        rcu_read_lock();
 797        dn_db = rcu_dereference(dev->dn_ptr);
 798        if (dn_db == NULL)
 799                goto out;
 800
 801        ifa = rcu_dereference(dn_db->ifa_list);
 802        if (ifa != NULL) {
 803                *addr = ifa->ifa_local;
 804                rv = 0;
 805        }
 806out:
 807        rcu_read_unlock();
 808        return rv;
 809}
 810
 811/*
 812 * Find a default address to bind to.
 813 *
 814 * This is one of those areas where the initial VMS concepts don't really
 815 * map onto the Linux concepts, and since we introduced multiple addresses
 816 * per interface we have to cope with slightly odd ways of finding out what
 817 * "our address" really is. Mostly it's not a problem; for this we just guess
 818 * a sensible default. Eventually the routing code will take care of all the
 819 * nasties for us I hope.
 820 */
 821int dn_dev_bind_default(__le16 *addr)
 822{
 823        struct net_device *dev;
 824        int rv;
 825        dev = dn_dev_get_default();
 826last_chance:
 827        if (dev) {
 828                rv = dn_dev_get_first(dev, addr);
 829                dev_put(dev);
 830                if (rv == 0 || dev == init_net.loopback_dev)
 831                        return rv;
 832        }
 833        dev = init_net.loopback_dev;
 834        dev_hold(dev);
 835        goto last_chance;
 836}
 837
 838static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 839{
 840        struct endnode_hello_message *msg;
 841        struct sk_buff *skb = NULL;
 842        __le16 *pktlen;
 843        struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
 844
 845        if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
 846                return;
 847
 848        skb->dev = dev;
 849
 850        msg = skb_put(skb, sizeof(*msg));
 851
 852        msg->msgflg  = 0x0D;
 853        memcpy(msg->tiver, dn_eco_version, 3);
 854        dn_dn2eth(msg->id, ifa->ifa_local);
 855        msg->iinfo   = DN_RT_INFO_ENDN;
 856        msg->blksize = cpu_to_le16(mtu2blksize(dev));
 857        msg->area    = 0x00;
 858        memset(msg->seed, 0, 8);
 859        memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
 860
 861        if (dn_db->router) {
 862                struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 863                dn_dn2eth(msg->neighbor, dn->addr);
 864        }
 865
 866        msg->timer   = cpu_to_le16((unsigned short)dn_db->parms.t3);
 867        msg->mpd     = 0x00;
 868        msg->datalen = 0x02;
 869        memset(msg->data, 0xAA, 2);
 870
 871        pktlen = skb_push(skb, 2);
 872        *pktlen = cpu_to_le16(skb->len - 2);
 873
 874        skb_reset_network_header(skb);
 875
 876        dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
 877}
 878
 879
 880#define DRDELAY (5 * HZ)
 881
 882static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
 883{
 884        /* First check time since device went up */
 885        if (time_before(jiffies, dn_db->uptime + DRDELAY))
 886                return 0;
 887
 888        /* If there is no router, then yes... */
 889        if (!dn_db->router)
 890                return 1;
 891
 892        /* otherwise only if we have a higher priority or.. */
 893        if (dn->priority < dn_db->parms.priority)
 894                return 1;
 895
 896        /* if we have equal priority and a higher node number */
 897        if (dn->priority != dn_db->parms.priority)
 898                return 0;
 899
 900        if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
 901                return 1;
 902
 903        return 0;
 904}
 905
 906static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 907{
 908        int n;
 909        struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
 910        struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
 911        struct sk_buff *skb;
 912        size_t size;
 913        unsigned char *ptr;
 914        unsigned char *i1, *i2;
 915        __le16 *pktlen;
 916        char *src;
 917
 918        if (mtu2blksize(dev) < (26 + 7))
 919                return;
 920
 921        n = mtu2blksize(dev) - 26;
 922        n /= 7;
 923
 924        if (n > 32)
 925                n = 32;
 926
 927        size = 2 + 26 + 7 * n;
 928
 929        if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
 930                return;
 931
 932        skb->dev = dev;
 933        ptr = skb_put(skb, size);
 934
 935        *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
 936        *ptr++ = 2; /* ECO */
 937        *ptr++ = 0;
 938        *ptr++ = 0;
 939        dn_dn2eth(ptr, ifa->ifa_local);
 940        src = ptr;
 941        ptr += ETH_ALEN;
 942        *ptr++ = dn_db->parms.forwarding == 1 ?
 943                        DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
 944        *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
 945        ptr += 2;
 946        *ptr++ = dn_db->parms.priority; /* Priority */
 947        *ptr++ = 0; /* Area: Reserved */
 948        *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
 949        ptr += 2;
 950        *ptr++ = 0; /* MPD: Reserved */
 951        i1 = ptr++;
 952        memset(ptr, 0, 7); /* Name: Reserved */
 953        ptr += 7;
 954        i2 = ptr++;
 955
 956        n = dn_neigh_elist(dev, ptr, n);
 957
 958        *i2 = 7 * n;
 959        *i1 = 8 + *i2;
 960
 961        skb_trim(skb, (27 + *i2));
 962
 963        pktlen = skb_push(skb, 2);
 964        *pktlen = cpu_to_le16(skb->len - 2);
 965
 966        skb_reset_network_header(skb);
 967
 968        if (dn_am_i_a_router(dn, dn_db, ifa)) {
 969                struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
 970                if (skb2) {
 971                        dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
 972                }
 973        }
 974
 975        dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
 976}
 977
 978static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 979{
 980        struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
 981
 982        if (dn_db->parms.forwarding == 0)
 983                dn_send_endnode_hello(dev, ifa);
 984        else
 985                dn_send_router_hello(dev, ifa);
 986}
 987
 988static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
 989{
 990        int tdlen = 16;
 991        int size = dev->hard_header_len + 2 + 4 + tdlen;
 992        struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
 993        int i;
 994        unsigned char *ptr;
 995        char src[ETH_ALEN];
 996
 997        if (skb == NULL)
 998                return ;
 999
1000        skb->dev = dev;
1001        skb_push(skb, dev->hard_header_len);
1002        ptr = skb_put(skb, 2 + 4 + tdlen);
1003
1004        *ptr++ = DN_RT_PKT_HELO;
1005        *((__le16 *)ptr) = ifa->ifa_local;
1006        ptr += 2;
1007        *ptr++ = tdlen;
1008
1009        for(i = 0; i < tdlen; i++)
1010                *ptr++ = 0252;
1011
1012        dn_dn2eth(src, ifa->ifa_local);
1013        dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
1014}
1015
1016static int dn_eth_up(struct net_device *dev)
1017{
1018        struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1019
1020        if (dn_db->parms.forwarding == 0)
1021                dev_mc_add(dev, dn_rt_all_end_mcast);
1022        else
1023                dev_mc_add(dev, dn_rt_all_rt_mcast);
1024
1025        dn_db->use_long = 1;
1026
1027        return 0;
1028}
1029
1030static void dn_eth_down(struct net_device *dev)
1031{
1032        struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1033
1034        if (dn_db->parms.forwarding == 0)
1035                dev_mc_del(dev, dn_rt_all_end_mcast);
1036        else
1037                dev_mc_del(dev, dn_rt_all_rt_mcast);
1038}
1039
1040static void dn_dev_set_timer(struct net_device *dev);
1041
1042static void dn_dev_timer_func(unsigned long arg)
1043{
1044        struct net_device *dev = (struct net_device *)arg;
1045        struct dn_dev *dn_db;
1046        struct dn_ifaddr *ifa;
1047
1048        rcu_read_lock();
1049        dn_db = rcu_dereference(dev->dn_ptr);
1050        if (dn_db->t3 <= dn_db->parms.t2) {
1051                if (dn_db->parms.timer3) {
1052                        for (ifa = rcu_dereference(dn_db->ifa_list);
1053                             ifa;
1054                             ifa = rcu_dereference(ifa->ifa_next)) {
1055                                if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1056                                        dn_db->parms.timer3(dev, ifa);
1057                        }
1058                }
1059                dn_db->t3 = dn_db->parms.t3;
1060        } else {
1061                dn_db->t3 -= dn_db->parms.t2;
1062        }
1063        rcu_read_unlock();
1064        dn_dev_set_timer(dev);
1065}
1066
1067static void dn_dev_set_timer(struct net_device *dev)
1068{
1069        struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1070
1071        if (dn_db->parms.t2 > dn_db->parms.t3)
1072                dn_db->parms.t2 = dn_db->parms.t3;
1073
1074        dn_db->timer.data = (unsigned long)dev;
1075        dn_db->timer.function = dn_dev_timer_func;
1076        dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1077
1078        add_timer(&dn_db->timer);
1079}
1080
1081static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
1082{
1083        int i;
1084        struct dn_dev_parms *p = dn_dev_list;
1085        struct dn_dev *dn_db;
1086
1087        for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1088                if (p->type == dev->type)
1089                        break;
1090        }
1091
1092        *err = -ENODEV;
1093        if (i == DN_DEV_LIST_SIZE)
1094                return NULL;
1095
1096        *err = -ENOBUFS;
1097        if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
1098                return NULL;
1099
1100        memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1101
1102        rcu_assign_pointer(dev->dn_ptr, dn_db);
1103        dn_db->dev = dev;
1104        init_timer(&dn_db->timer);
1105
1106        dn_db->uptime = jiffies;
1107
1108        dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1109        if (!dn_db->neigh_parms) {
1110                RCU_INIT_POINTER(dev->dn_ptr, NULL);
1111                kfree(dn_db);
1112                return NULL;
1113        }
1114
1115        if (dn_db->parms.up) {
1116                if (dn_db->parms.up(dev) < 0) {
1117                        neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1118                        dev->dn_ptr = NULL;
1119                        kfree(dn_db);
1120                        return NULL;
1121                }
1122        }
1123
1124        dn_dev_sysctl_register(dev, &dn_db->parms);
1125
1126        dn_dev_set_timer(dev);
1127
1128        *err = 0;
1129        return dn_db;
1130}
1131
1132
1133/*
1134 * This processes a device up event. We only start up
1135 * the loopback device & ethernet devices with correct
1136 * MAC addresses automatically. Others must be started
1137 * specifically.
1138 *
1139 * FIXME: How should we configure the loopback address ? If we could dispense
1140 * with using decnet_address here and for autobind, it will be one less thing
1141 * for users to worry about setting up.
1142 */
1143
1144void dn_dev_up(struct net_device *dev)
1145{
1146        struct dn_ifaddr *ifa;
1147        __le16 addr = decnet_address;
1148        int maybe_default = 0;
1149        struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1150
1151        if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1152                return;
1153
1154        /*
1155         * Need to ensure that loopback device has a dn_db attached to it
1156         * to allow creation of neighbours against it, even though it might
1157         * not have a local address of its own. Might as well do the same for
1158         * all autoconfigured interfaces.
1159         */
1160        if (dn_db == NULL) {
1161                int err;
1162                dn_db = dn_dev_create(dev, &err);
1163                if (dn_db == NULL)
1164                        return;
1165        }
1166
1167        if (dev->type == ARPHRD_ETHER) {
1168                if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1169                        return;
1170                addr = dn_eth2dn(dev->dev_addr);
1171                maybe_default = 1;
1172        }
1173
1174        if (addr == 0)
1175                return;
1176
1177        if ((ifa = dn_dev_alloc_ifa()) == NULL)
1178                return;
1179
1180        ifa->ifa_local = ifa->ifa_address = addr;
1181        ifa->ifa_flags = 0;
1182        ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1183        strcpy(ifa->ifa_label, dev->name);
1184
1185        dn_dev_set_ifa(dev, ifa);
1186
1187        /*
1188         * Automagically set the default device to the first automatically
1189         * configured ethernet card in the system.
1190         */
1191        if (maybe_default) {
1192                dev_hold(dev);
1193                if (dn_dev_set_default(dev, 0))
1194                        dev_put(dev);
1195        }
1196}
1197
1198static void dn_dev_delete(struct net_device *dev)
1199{
1200        struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1201
1202        if (dn_db == NULL)
1203                return;
1204
1205        del_timer_sync(&dn_db->timer);
1206        dn_dev_sysctl_unregister(&dn_db->parms);
1207        dn_dev_check_default(dev);
1208        neigh_ifdown(&dn_neigh_table, dev);
1209
1210        if (dn_db->parms.down)
1211                dn_db->parms.down(dev);
1212
1213        dev->dn_ptr = NULL;
1214
1215        neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1216        neigh_ifdown(&dn_neigh_table, dev);
1217
1218        if (dn_db->router)
1219                neigh_release(dn_db->router);
1220        if (dn_db->peer)
1221                neigh_release(dn_db->peer);
1222
1223        kfree(dn_db);
1224}
1225
1226void dn_dev_down(struct net_device *dev)
1227{
1228        struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
1229        struct dn_ifaddr *ifa;
1230
1231        if (dn_db == NULL)
1232                return;
1233
1234        while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
1235                dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1236                dn_dev_free_ifa(ifa);
1237        }
1238
1239        dn_dev_delete(dev);
1240}
1241
1242void dn_dev_init_pkt(struct sk_buff *skb)
1243{
1244}
1245
1246void dn_dev_veri_pkt(struct sk_buff *skb)
1247{
1248}
1249
1250void dn_dev_hello(struct sk_buff *skb)
1251{
1252}
1253
1254void dn_dev_devices_off(void)
1255{
1256        struct net_device *dev;
1257
1258        rtnl_lock();
1259        for_each_netdev(&init_net, dev)
1260                dn_dev_down(dev);
1261        rtnl_unlock();
1262
1263}
1264
1265void dn_dev_devices_on(void)
1266{
1267        struct net_device *dev;
1268
1269        rtnl_lock();
1270        for_each_netdev(&init_net, dev) {
1271                if (dev->flags & IFF_UP)
1272                        dn_dev_up(dev);
1273        }
1274        rtnl_unlock();
1275}
1276
1277int register_dnaddr_notifier(struct notifier_block *nb)
1278{
1279        return blocking_notifier_chain_register(&dnaddr_chain, nb);
1280}
1281
1282int unregister_dnaddr_notifier(struct notifier_block *nb)
1283{
1284        return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
1285}
1286
1287#ifdef CONFIG_PROC_FS
1288static inline int is_dn_dev(struct net_device *dev)
1289{
1290        return dev->dn_ptr != NULL;
1291}
1292
1293static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
1294        __acquires(RCU)
1295{
1296        int i;
1297        struct net_device *dev;
1298
1299        rcu_read_lock();
1300
1301        if (*pos == 0)
1302                return SEQ_START_TOKEN;
1303
1304        i = 1;
1305        for_each_netdev_rcu(&init_net, dev) {
1306                if (!is_dn_dev(dev))
1307                        continue;
1308
1309                if (i++ == *pos)
1310                        return dev;
1311        }
1312
1313        return NULL;
1314}
1315
1316static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1317{
1318        struct net_device *dev;
1319
1320        ++*pos;
1321
1322        dev = v;
1323        if (v == SEQ_START_TOKEN)
1324                dev = net_device_entry(&init_net.dev_base_head);
1325
1326        for_each_netdev_continue_rcu(&init_net, dev) {
1327                if (!is_dn_dev(dev))
1328                        continue;
1329
1330                return dev;
1331        }
1332
1333        return NULL;
1334}
1335
1336static void dn_dev_seq_stop(struct seq_file *seq, void *v)
1337        __releases(RCU)
1338{
1339        rcu_read_unlock();
1340}
1341
1342static char *dn_type2asc(char type)
1343{
1344        switch (type) {
1345        case DN_DEV_BCAST:
1346                return "B";
1347        case DN_DEV_UCAST:
1348                return "U";
1349        case DN_DEV_MPOINT:
1350                return "M";
1351        }
1352
1353        return "?";
1354}
1355
1356static int dn_dev_seq_show(struct seq_file *seq, void *v)
1357{
1358        if (v == SEQ_START_TOKEN)
1359                seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
1360        else {
1361                struct net_device *dev = v;
1362                char peer_buf[DN_ASCBUF_LEN];
1363                char router_buf[DN_ASCBUF_LEN];
1364                struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr);
1365
1366                seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
1367                                "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
1368                                dev->name ? dev->name : "???",
1369                                dn_type2asc(dn_db->parms.mode),
1370                                0, 0,
1371                                dn_db->t3, dn_db->parms.t3,
1372                                mtu2blksize(dev),
1373                                dn_db->parms.priority,
1374                                dn_db->parms.state, dn_db->parms.name,
1375                                dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1376                                dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
1377        }
1378        return 0;
1379}
1380
1381static const struct seq_operations dn_dev_seq_ops = {
1382        .start  = dn_dev_seq_start,
1383        .next   = dn_dev_seq_next,
1384        .stop   = dn_dev_seq_stop,
1385        .show   = dn_dev_seq_show,
1386};
1387
1388static int dn_dev_seq_open(struct inode *inode, struct file *file)
1389{
1390        return seq_open(file, &dn_dev_seq_ops);
1391}
1392
1393static const struct file_operations dn_dev_seq_fops = {
1394        .owner   = THIS_MODULE,
1395        .open    = dn_dev_seq_open,
1396        .read    = seq_read,
1397        .llseek  = seq_lseek,
1398        .release = seq_release,
1399};
1400
1401#endif /* CONFIG_PROC_FS */
1402
1403static int addr[2];
1404module_param_array(addr, int, NULL, 0444);
1405MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1406
1407void __init dn_dev_init(void)
1408{
1409        if (addr[0] > 63 || addr[0] < 0) {
1410                printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1411                return;
1412        }
1413
1414        if (addr[1] > 1023 || addr[1] < 0) {
1415                printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1416                return;
1417        }
1418
1419        decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
1420
1421        dn_dev_devices_on();
1422
1423        rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL, 0);
1424        rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL, 0);
1425        rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr, 0);
1426
1427        proc_create("decnet_dev", S_IRUGO, init_net.proc_net, &dn_dev_seq_fops);
1428
1429#ifdef CONFIG_SYSCTL
1430        {
1431                int i;
1432                for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1433                        dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1434        }
1435#endif /* CONFIG_SYSCTL */
1436}
1437
1438void __exit dn_dev_cleanup(void)
1439{
1440#ifdef CONFIG_SYSCTL
1441        {
1442                int i;
1443                for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1444                        dn_dev_sysctl_unregister(&dn_dev_list[i]);
1445        }
1446#endif /* CONFIG_SYSCTL */
1447
1448        remove_proc_entry("decnet_dev", init_net.proc_net);
1449
1450        dn_dev_devices_off();
1451}
1452