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dn_dev.c

/*
 * DECnet       An implementation of the DECnet protocol suite for the LINUX
 *              operating system.  DECnet is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              DECnet Device Layer
 *
 * Authors:     Steve Whitehouse <SteveW@ACM.org>
 *              Eduardo Marcelo Serrat <emserrat@geocities.com>
 *
 * Changes:
 *          Steve Whitehouse : Devices now see incoming frames so they
 *                             can mark on who it came from.
 *          Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
 *                             can now have a device specific setup func.
 *          Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
 *          Steve Whitehouse : Fixed bug which sometimes killed timer
 *          Steve Whitehouse : Multiple ifaddr support
 *          Steve Whitehouse : SIOCGIFCONF is now a compile time option
 *          Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
 *          Steve Whitehouse : Removed timer1 - it's a user space issue now
 *         Patrick Caulfield : Fixed router hello message format
 *          Steve Whitehouse : Got rid of constant sizes for blksize for
 *                             devices. All mtu based now.
 */

#include <linux/capability.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/if_addr.h>
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/sysctl.h>
#include <linux/notifier.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <net/net_namespace.h>
#include <net/neighbour.h>
#include <net/dst.h>
#include <net/flow.h>
#include <net/fib_rules.h>
#include <net/netlink.h>
#include <net/dn.h>
#include <net/dn_dev.h>
#include <net/dn_route.h>
#include <net/dn_neigh.h>
#include <net/dn_fib.h>

#define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))

static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
static char dn_rt_all_rt_mcast[ETH_ALEN]  = {0xAB,0x00,0x00,0x03,0x00,0x00};
static char dn_hiord[ETH_ALEN]            = {0xAA,0x00,0x04,0x00,0x00,0x00};
static unsigned char dn_eco_version[3]    = {0x02,0x00,0x00};

extern struct neigh_table dn_neigh_table;

/*
 * decnet_address is kept in network order.
 */
__le16 decnet_address = 0;

static DEFINE_RWLOCK(dndev_lock);
static struct net_device *decnet_default_device;
static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);

static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
static void dn_dev_delete(struct net_device *dev);
static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);

static int dn_eth_up(struct net_device *);
static void dn_eth_down(struct net_device *);
static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);

static struct dn_dev_parms dn_dev_list[] =  {
{
      .type =           ARPHRD_ETHER, /* Ethernet */
      .mode =           DN_DEV_BCAST,
      .state =    DN_DEV_S_RU,
      .t2 =       1,
      .t3 =       10,
      .name =           "ethernet",
      .ctl_name = NET_DECNET_CONF_ETHER,
      .up =       dn_eth_up,
      .down =     dn_eth_down,
      .timer3 =   dn_send_brd_hello,
},
{
      .type =           ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
      .mode =           DN_DEV_BCAST,
      .state =    DN_DEV_S_RU,
      .t2 =       1,
      .t3 =       10,
      .name =           "ipgre",
      .ctl_name = NET_DECNET_CONF_GRE,
      .timer3 =   dn_send_brd_hello,
},
#if 0
{
      .type =           ARPHRD_X25, /* Bog standard X.25 */
      .mode =           DN_DEV_UCAST,
      .state =    DN_DEV_S_DS,
      .t2 =       1,
      .t3 =       120,
      .name =           "x25",
      .ctl_name = NET_DECNET_CONF_X25,
      .timer3 =   dn_send_ptp_hello,
},
#endif
#if 0
{
      .type =           ARPHRD_PPP, /* DECnet over PPP */
      .mode =           DN_DEV_BCAST,
      .state =    DN_DEV_S_RU,
      .t2 =       1,
      .t3 =       10,
      .name =           "ppp",
      .ctl_name = NET_DECNET_CONF_PPP,
      .timer3 =   dn_send_brd_hello,
},
#endif
{
      .type =           ARPHRD_DDCMP, /* DECnet over DDCMP */
      .mode =           DN_DEV_UCAST,
      .state =    DN_DEV_S_DS,
      .t2 =       1,
      .t3 =       120,
      .name =           "ddcmp",
      .ctl_name = NET_DECNET_CONF_DDCMP,
      .timer3 =   dn_send_ptp_hello,
},
{
      .type =           ARPHRD_LOOPBACK, /* Loopback interface - always last */
      .mode =           DN_DEV_BCAST,
      .state =    DN_DEV_S_RU,
      .t2 =       1,
      .t3 =       10,
      .name =           "loopback",
      .ctl_name = NET_DECNET_CONF_LOOPBACK,
      .timer3 =   dn_send_brd_hello,
}
};

#define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)

#define DN_DEV_PARMS_OFFSET(x) ((int) ((char *) &((struct dn_dev_parms *)0)->x))

#ifdef CONFIG_SYSCTL

static int min_t2[] = { 1 };
static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
static int min_t3[] = { 1 };
static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */

static int min_priority[1];
static int max_priority[] = { 127 }; /* From DECnet spec */

static int dn_forwarding_proc(ctl_table *, int, struct file *,
                  void __user *, size_t *, loff_t *);
static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
                  void __user *oldval, size_t __user *oldlenp,
                  void __user *newval, size_t newlen);

static struct dn_dev_sysctl_table {
      struct ctl_table_header *sysctl_header;
      ctl_table dn_dev_vars[5];
      ctl_table dn_dev_dev[2];
      ctl_table dn_dev_conf_dir[2];
      ctl_table dn_dev_proto_dir[2];
      ctl_table dn_dev_root_dir[2];
} dn_dev_sysctl = {
      NULL,
      {
      {
            .ctl_name = NET_DECNET_CONF_DEV_FORWARDING,
            .procname = "forwarding",
            .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
            .maxlen = sizeof(int),
            .mode = 0644,
            .proc_handler = dn_forwarding_proc,
            .strategy = dn_forwarding_sysctl,
      },
      {
            .ctl_name = NET_DECNET_CONF_DEV_PRIORITY,
            .procname = "priority",
            .data = (void *)DN_DEV_PARMS_OFFSET(priority),
            .maxlen = sizeof(int),
            .mode = 0644,
            .proc_handler = proc_dointvec_minmax,
            .strategy = sysctl_intvec,
            .extra1 = &min_priority,
            .extra2 = &max_priority
      },
      {
            .ctl_name = NET_DECNET_CONF_DEV_T2,
            .procname = "t2",
            .data = (void *)DN_DEV_PARMS_OFFSET(t2),
            .maxlen = sizeof(int),
            .mode = 0644,
            .proc_handler = proc_dointvec_minmax,
            .strategy = sysctl_intvec,
            .extra1 = &min_t2,
            .extra2 = &max_t2
      },
      {
            .ctl_name = NET_DECNET_CONF_DEV_T3,
            .procname = "t3",
            .data = (void *)DN_DEV_PARMS_OFFSET(t3),
            .maxlen = sizeof(int),
            .mode = 0644,
            .proc_handler = proc_dointvec_minmax,
            .strategy = sysctl_intvec,
            .extra1 = &min_t3,
            .extra2 = &max_t3
      },
      {0}
      },
      {{
            .ctl_name = 0,
            .procname = "",
            .mode = 0555,
            .child = dn_dev_sysctl.dn_dev_vars
      }, {0}},
      {{
            .ctl_name = NET_DECNET_CONF,
            .procname = "conf",
            .mode = 0555,
            .child = dn_dev_sysctl.dn_dev_dev
      }, {0}},
      {{
            .ctl_name = NET_DECNET,
            .procname = "decnet",
            .mode = 0555,
            .child = dn_dev_sysctl.dn_dev_conf_dir
      }, {0}},
      {{
            .ctl_name = CTL_NET,
            .procname = "net",
            .mode = 0555,
            .child = dn_dev_sysctl.dn_dev_proto_dir
      }, {0}}
};

static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
{
      struct dn_dev_sysctl_table *t;
      int i;

      t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
      if (t == NULL)
            return;

      for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
            long offset = (long)t->dn_dev_vars[i].data;
            t->dn_dev_vars[i].data = ((char *)parms) + offset;
      }

      if (dev) {
            t->dn_dev_dev[0].procname = dev->name;
            t->dn_dev_dev[0].ctl_name = dev->ifindex;
      } else {
            t->dn_dev_dev[0].procname = parms->name;
            t->dn_dev_dev[0].ctl_name = parms->ctl_name;
      }

      t->dn_dev_dev[0].child = t->dn_dev_vars;
      t->dn_dev_conf_dir[0].child = t->dn_dev_dev;
      t->dn_dev_proto_dir[0].child = t->dn_dev_conf_dir;
      t->dn_dev_root_dir[0].child = t->dn_dev_proto_dir;
      t->dn_dev_vars[0].extra1 = (void *)dev;

      t->sysctl_header = register_sysctl_table(t->dn_dev_root_dir);
      if (t->sysctl_header == NULL)
            kfree(t);
      else
            parms->sysctl = t;
}

static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
{
      if (parms->sysctl) {
            struct dn_dev_sysctl_table *t = parms->sysctl;
            parms->sysctl = NULL;
            unregister_sysctl_table(t->sysctl_header);
            kfree(t);
      }
}

static int dn_forwarding_proc(ctl_table *table, int write,
                        struct file *filep,
                        void __user *buffer,
                        size_t *lenp, loff_t *ppos)
{
#ifdef CONFIG_DECNET_ROUTER
      struct net_device *dev = table->extra1;
      struct dn_dev *dn_db;
      int err;
      int tmp, old;

      if (table->extra1 == NULL)
            return -EINVAL;

      dn_db = dev->dn_ptr;
      old = dn_db->parms.forwarding;

      err = proc_dointvec(table, write, filep, buffer, lenp, ppos);

      if ((err >= 0) && write) {
            if (dn_db->parms.forwarding < 0)
                  dn_db->parms.forwarding = 0;
            if (dn_db->parms.forwarding > 2)
                  dn_db->parms.forwarding = 2;
            /*
             * What an ugly hack this is... its works, just. It
             * would be nice if sysctl/proc were just that little
             * bit more flexible so I don't have to write a special
             * routine, or suffer hacks like this - SJW
             */
            tmp = dn_db->parms.forwarding;
            dn_db->parms.forwarding = old;
            if (dn_db->parms.down)
                  dn_db->parms.down(dev);
            dn_db->parms.forwarding = tmp;
            if (dn_db->parms.up)
                  dn_db->parms.up(dev);
      }

      return err;
#else
      return -EINVAL;
#endif
}

static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
                  void __user *oldval, size_t __user *oldlenp,
                  void __user *newval, size_t newlen)
{
#ifdef CONFIG_DECNET_ROUTER
      struct net_device *dev = table->extra1;
      struct dn_dev *dn_db;
      int value;

      if (table->extra1 == NULL)
            return -EINVAL;

      dn_db = dev->dn_ptr;

      if (newval && newlen) {
            if (newlen != sizeof(int))
                  return -EINVAL;

            if (get_user(value, (int __user *)newval))
                  return -EFAULT;
            if (value < 0)
                  return -EINVAL;
            if (value > 2)
                  return -EINVAL;

            if (dn_db->parms.down)
                  dn_db->parms.down(dev);
            dn_db->parms.forwarding = value;
            if (dn_db->parms.up)
                  dn_db->parms.up(dev);
      }

      return 0;
#else
      return -EINVAL;
#endif
}

#else /* CONFIG_SYSCTL */
static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
{
}
static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
{
}

#endif /* CONFIG_SYSCTL */

static inline __u16 mtu2blksize(struct net_device *dev)
{
      u32 blksize = dev->mtu;
      if (blksize > 0xffff)
            blksize = 0xffff;

      if (dev->type == ARPHRD_ETHER ||
          dev->type == ARPHRD_PPP ||
          dev->type == ARPHRD_IPGRE ||
          dev->type == ARPHRD_LOOPBACK)
            blksize -= 2;

      return (__u16)blksize;
}

static struct dn_ifaddr *dn_dev_alloc_ifa(void)
{
      struct dn_ifaddr *ifa;

      ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);

      return ifa;
}

static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
{
      kfree(ifa);
}

static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
{
      struct dn_ifaddr *ifa1 = *ifap;
      unsigned char mac_addr[6];
      struct net_device *dev = dn_db->dev;

      ASSERT_RTNL();

      *ifap = ifa1->ifa_next;

      if (dn_db->dev->type == ARPHRD_ETHER) {
            if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
                  dn_dn2eth(mac_addr, ifa1->ifa_local);
                  dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
            }
      }

      dn_ifaddr_notify(RTM_DELADDR, ifa1);
      blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
      if (destroy) {
            dn_dev_free_ifa(ifa1);

            if (dn_db->ifa_list == NULL)
                  dn_dev_delete(dn_db->dev);
      }
}

static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
{
      struct net_device *dev = dn_db->dev;
      struct dn_ifaddr *ifa1;
      unsigned char mac_addr[6];

      ASSERT_RTNL();

      /* Check for duplicates */
      for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
            if (ifa1->ifa_local == ifa->ifa_local)
                  return -EEXIST;
      }

      if (dev->type == ARPHRD_ETHER) {
            if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
                  dn_dn2eth(mac_addr, ifa->ifa_local);
                  dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
            }
      }

      ifa->ifa_next = dn_db->ifa_list;
      dn_db->ifa_list = ifa;

      dn_ifaddr_notify(RTM_NEWADDR, ifa);
      blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);

      return 0;
}

static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
{
      struct dn_dev *dn_db = dev->dn_ptr;
      int rv;

      if (dn_db == NULL) {
            int err;
            dn_db = dn_dev_create(dev, &err);
            if (dn_db == NULL)
                  return err;
      }

      ifa->ifa_dev = dn_db;

      if (dev->flags & IFF_LOOPBACK)
            ifa->ifa_scope = RT_SCOPE_HOST;

      rv = dn_dev_insert_ifa(dn_db, ifa);
      if (rv)
            dn_dev_free_ifa(ifa);
      return rv;
}


int dn_dev_ioctl(unsigned int cmd, void __user *arg)
{
      char buffer[DN_IFREQ_SIZE];
      struct ifreq *ifr = (struct ifreq *)buffer;
      struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
      struct dn_dev *dn_db;
      struct net_device *dev;
      struct dn_ifaddr *ifa = NULL, **ifap = NULL;
      int ret = 0;

      if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
            return -EFAULT;
      ifr->ifr_name[IFNAMSIZ-1] = 0;

#ifdef CONFIG_KMOD
      dev_load(&init_net, ifr->ifr_name);
#endif

      switch(cmd) {
            case SIOCGIFADDR:
                  break;
            case SIOCSIFADDR:
                  if (!capable(CAP_NET_ADMIN))
                        return -EACCES;
                  if (sdn->sdn_family != AF_DECnet)
                        return -EINVAL;
                  break;
            default:
                  return -EINVAL;
      }

      rtnl_lock();

      if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
            ret = -ENODEV;
            goto done;
      }

      if ((dn_db = dev->dn_ptr) != NULL) {
            for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
                  if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
                        break;
      }

      if (ifa == NULL && cmd != SIOCSIFADDR) {
            ret = -EADDRNOTAVAIL;
            goto done;
      }

      switch(cmd) {
            case SIOCGIFADDR:
                  *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
                  goto rarok;

            case SIOCSIFADDR:
                  if (!ifa) {
                        if ((ifa = dn_dev_alloc_ifa()) == NULL) {
                              ret = -ENOBUFS;
                              break;
                        }
                        memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
                  } else {
                        if (ifa->ifa_local == dn_saddr2dn(sdn))
                              break;
                        dn_dev_del_ifa(dn_db, ifap, 0);
                  }

                  ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);

                  ret = dn_dev_set_ifa(dev, ifa);
      }
done:
      rtnl_unlock();

      return ret;
rarok:
      if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
            ret = -EFAULT;
      goto done;
}

struct net_device *dn_dev_get_default(void)
{
      struct net_device *dev;
      read_lock(&dndev_lock);
      dev = decnet_default_device;
      if (dev) {
            if (dev->dn_ptr)
                  dev_hold(dev);
            else
                  dev = NULL;
      }
      read_unlock(&dndev_lock);
      return dev;
}

int dn_dev_set_default(struct net_device *dev, int force)
{
      struct net_device *old = NULL;
      int rv = -EBUSY;
      if (!dev->dn_ptr)
            return -ENODEV;
      write_lock(&dndev_lock);
      if (force || decnet_default_device == NULL) {
            old = decnet_default_device;
            decnet_default_device = dev;
            rv = 0;
      }
      write_unlock(&dndev_lock);
      if (old)
            dev_put(old);
      return rv;
}

static void dn_dev_check_default(struct net_device *dev)
{
      write_lock(&dndev_lock);
      if (dev == decnet_default_device) {
            decnet_default_device = NULL;
      } else {
            dev = NULL;
      }
      write_unlock(&dndev_lock);
      if (dev)
            dev_put(dev);
}

static struct dn_dev *dn_dev_by_index(int ifindex)
{
      struct net_device *dev;
      struct dn_dev *dn_dev = NULL;
      dev = dev_get_by_index(&init_net, ifindex);
      if (dev) {
            dn_dev = dev->dn_ptr;
            dev_put(dev);
      }

      return dn_dev;
}

static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
      [IFA_ADDRESS]           = { .type = NLA_U16 },
      [IFA_LOCAL]       = { .type = NLA_U16 },
      [IFA_LABEL]       = { .type = NLA_STRING,
                            .len = IFNAMSIZ - 1 },
};

static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
      struct nlattr *tb[IFA_MAX+1];
      struct dn_dev *dn_db;
      struct ifaddrmsg *ifm;
      struct dn_ifaddr *ifa, **ifap;
      int err;

      err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
      if (err < 0)
            goto errout;

      err = -ENODEV;
      ifm = nlmsg_data(nlh);
      if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
            goto errout;

      err = -EADDRNOTAVAIL;
      for (ifap = &dn_db->ifa_list; (ifa = *ifap); ifap = &ifa->ifa_next) {
            if (tb[IFA_LOCAL] &&
                nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
                  continue;

            if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
                  continue;

            dn_dev_del_ifa(dn_db, ifap, 1);
            return 0;
      }

errout:
      return err;
}

static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
      struct nlattr *tb[IFA_MAX+1];
      struct net_device *dev;
      struct dn_dev *dn_db;
      struct ifaddrmsg *ifm;
      struct dn_ifaddr *ifa;
      int err;

      err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
      if (err < 0)
            return err;

      if (tb[IFA_LOCAL] == NULL)
            return -EINVAL;

      ifm = nlmsg_data(nlh);
      if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
            return -ENODEV;

      if ((dn_db = dev->dn_ptr) == NULL) {
            int err;
            dn_db = dn_dev_create(dev, &err);
            if (!dn_db)
                  return err;
      }

      if ((ifa = dn_dev_alloc_ifa()) == NULL)
            return -ENOBUFS;

      if (tb[IFA_ADDRESS] == NULL)
            tb[IFA_ADDRESS] = tb[IFA_LOCAL];

      ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
      ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
      ifa->ifa_flags = ifm->ifa_flags;
      ifa->ifa_scope = ifm->ifa_scope;
      ifa->ifa_dev = dn_db;

      if (tb[IFA_LABEL])
            nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
      else
            memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);

      err = dn_dev_insert_ifa(dn_db, ifa);
      if (err)
            dn_dev_free_ifa(ifa);

      return err;
}

static inline size_t dn_ifaddr_nlmsg_size(void)
{
      return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
             + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
             + nla_total_size(2) /* IFA_ADDRESS */
             + nla_total_size(2); /* IFA_LOCAL */
}

static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
                       u32 pid, u32 seq, int event, unsigned int flags)
{
      struct ifaddrmsg *ifm;
      struct nlmsghdr *nlh;

      nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
      if (nlh == NULL)
            return -EMSGSIZE;

      ifm = nlmsg_data(nlh);
      ifm->ifa_family = AF_DECnet;
      ifm->ifa_prefixlen = 16;
      ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
      ifm->ifa_scope = ifa->ifa_scope;
      ifm->ifa_index = ifa->ifa_dev->dev->ifindex;

      if (ifa->ifa_address)
            NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
      if (ifa->ifa_local)
            NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
      if (ifa->ifa_label[0])
            NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);

      return nlmsg_end(skb, nlh);

nla_put_failure:
      nlmsg_cancel(skb, nlh);
      return -EMSGSIZE;
}

static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
{
      struct sk_buff *skb;
      int err = -ENOBUFS;

      skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
      if (skb == NULL)
            goto errout;

      err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
      if (err < 0) {
            /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
            WARN_ON(err == -EMSGSIZE);
            kfree_skb(skb);
            goto errout;
      }
      err = rtnl_notify(skb, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
errout:
      if (err < 0)
            rtnl_set_sk_err(RTNLGRP_DECnet_IFADDR, err);
}

static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
{
      int idx, dn_idx = 0, skip_ndevs, skip_naddr;
      struct net_device *dev;
      struct dn_dev *dn_db;
      struct dn_ifaddr *ifa;

      skip_ndevs = cb->args[0];
      skip_naddr = cb->args[1];

      idx = 0;
      for_each_netdev(&init_net, dev) {
            if (idx < skip_ndevs)
                  goto cont;
            else if (idx > skip_ndevs) {
                  /* Only skip over addresses for first dev dumped
                   * in this iteration (idx == skip_ndevs) */
                  skip_naddr = 0;
            }

            if ((dn_db = dev->dn_ptr) == NULL)
                  goto cont;

            for (ifa = dn_db->ifa_list, dn_idx = 0; ifa;
                 ifa = ifa->ifa_next, dn_idx++) {
                  if (dn_idx < skip_naddr)
                        continue;

                  if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
                                    cb->nlh->nlmsg_seq, RTM_NEWADDR,
                                    NLM_F_MULTI) < 0)
                        goto done;
            }
cont:
            idx++;
      }
done:
      cb->args[0] = idx;
      cb->args[1] = dn_idx;

      return skb->len;
}

static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
{
      struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
      struct dn_ifaddr *ifa;
      int rv = -ENODEV;
      if (dn_db == NULL)
            goto out;
      ifa = dn_db->ifa_list;
      if (ifa != NULL) {
            *addr = ifa->ifa_local;
            rv = 0;
      }
out:
      return rv;
}

/*
 * Find a default address to bind to.
 *
 * This is one of those areas where the initial VMS concepts don't really
 * map onto the Linux concepts, and since we introduced multiple addresses
 * per interface we have to cope with slightly odd ways of finding out what
 * "our address" really is. Mostly it's not a problem; for this we just guess
 * a sensible default. Eventually the routing code will take care of all the
 * nasties for us I hope.
 */
int dn_dev_bind_default(__le16 *addr)
{
      struct net_device *dev;
      int rv;
      dev = dn_dev_get_default();
last_chance:
      if (dev) {
            read_lock(&dev_base_lock);
            rv = dn_dev_get_first(dev, addr);
            read_unlock(&dev_base_lock);
            dev_put(dev);
            if (rv == 0 || dev == init_net.loopback_dev)
                  return rv;
      }
      dev = init_net.loopback_dev;
      dev_hold(dev);
      goto last_chance;
}

static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
{
      struct endnode_hello_message *msg;
      struct sk_buff *skb = NULL;
      __le16 *pktlen;
      struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;

      if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
            return;

      skb->dev = dev;

      msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));

      msg->msgflg  = 0x0D;
      memcpy(msg->tiver, dn_eco_version, 3);
      dn_dn2eth(msg->id, ifa->ifa_local);
      msg->iinfo   = DN_RT_INFO_ENDN;
      msg->blksize = dn_htons(mtu2blksize(dev));
      msg->area    = 0x00;
      memset(msg->seed, 0, 8);
      memcpy(msg->neighbor, dn_hiord, ETH_ALEN);

      if (dn_db->router) {
            struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
            dn_dn2eth(msg->neighbor, dn->addr);
      }

      msg->timer   = dn_htons((unsigned short)dn_db->parms.t3);
      msg->mpd     = 0x00;
      msg->datalen = 0x02;
      memset(msg->data, 0xAA, 2);

      pktlen = (__le16 *)skb_push(skb,2);
      *pktlen = dn_htons(skb->len - 2);

      skb_reset_network_header(skb);

      dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
}


#define DRDELAY (5 * HZ)

static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
{
      /* First check time since device went up */
      if ((jiffies - dn_db->uptime) < DRDELAY)
            return 0;

      /* If there is no router, then yes... */
      if (!dn_db->router)
            return 1;

      /* otherwise only if we have a higher priority or.. */
      if (dn->priority < dn_db->parms.priority)
            return 1;

      /* if we have equal priority and a higher node number */
      if (dn->priority != dn_db->parms.priority)
            return 0;

      if (dn_ntohs(dn->addr) < dn_ntohs(ifa->ifa_local))
            return 1;

      return 0;
}

static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
{
      int n;
      struct dn_dev *dn_db = dev->dn_ptr;
      struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
      struct sk_buff *skb;
      size_t size;
      unsigned char *ptr;
      unsigned char *i1, *i2;
      __le16 *pktlen;
      char *src;

      if (mtu2blksize(dev) < (26 + 7))
            return;

      n = mtu2blksize(dev) - 26;
      n /= 7;

      if (n > 32)
            n = 32;

      size = 2 + 26 + 7 * n;

      if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
            return;

      skb->dev = dev;
      ptr = skb_put(skb, size);

      *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
      *ptr++ = 2; /* ECO */
      *ptr++ = 0;
      *ptr++ = 0;
      dn_dn2eth(ptr, ifa->ifa_local);
      src = ptr;
      ptr += ETH_ALEN;
      *ptr++ = dn_db->parms.forwarding == 1 ?
                  DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
      *((__le16 *)ptr) = dn_htons(mtu2blksize(dev));
      ptr += 2;
      *ptr++ = dn_db->parms.priority; /* Priority */
      *ptr++ = 0; /* Area: Reserved */
      *((__le16 *)ptr) = dn_htons((unsigned short)dn_db->parms.t3);
      ptr += 2;
      *ptr++ = 0; /* MPD: Reserved */
      i1 = ptr++;
      memset(ptr, 0, 7); /* Name: Reserved */
      ptr += 7;
      i2 = ptr++;

      n = dn_neigh_elist(dev, ptr, n);

      *i2 = 7 * n;
      *i1 = 8 + *i2;

      skb_trim(skb, (27 + *i2));

      pktlen = (__le16 *)skb_push(skb, 2);
      *pktlen = dn_htons(skb->len - 2);

      skb_reset_network_header(skb);

      if (dn_am_i_a_router(dn, dn_db, ifa)) {
            struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
            if (skb2) {
                  dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
            }
      }

      dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
}

static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
{
      struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;

      if (dn_db->parms.forwarding == 0)
            dn_send_endnode_hello(dev, ifa);
      else
            dn_send_router_hello(dev, ifa);
}

static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
{
      int tdlen = 16;
      int size = dev->hard_header_len + 2 + 4 + tdlen;
      struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
      int i;
      unsigned char *ptr;
      char src[ETH_ALEN];

      if (skb == NULL)
            return ;

      skb->dev = dev;
      skb_push(skb, dev->hard_header_len);
      ptr = skb_put(skb, 2 + 4 + tdlen);

      *ptr++ = DN_RT_PKT_HELO;
      *((__le16 *)ptr) = ifa->ifa_local;
      ptr += 2;
      *ptr++ = tdlen;

      for(i = 0; i < tdlen; i++)
            *ptr++ = 0252;

      dn_dn2eth(src, ifa->ifa_local);
      dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
}

static int dn_eth_up(struct net_device *dev)
{
      struct dn_dev *dn_db = dev->dn_ptr;

      if (dn_db->parms.forwarding == 0)
            dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
      else
            dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);

      dn_db->use_long = 1;

      return 0;
}

static void dn_eth_down(struct net_device *dev)
{
      struct dn_dev *dn_db = dev->dn_ptr;

      if (dn_db->parms.forwarding == 0)
            dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
      else
            dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
}

static void dn_dev_set_timer(struct net_device *dev);

static void dn_dev_timer_func(unsigned long arg)
{
      struct net_device *dev = (struct net_device *)arg;
      struct dn_dev *dn_db = dev->dn_ptr;
      struct dn_ifaddr *ifa;

      if (dn_db->t3 <= dn_db->parms.t2) {
            if (dn_db->parms.timer3) {
                  for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
                        if (!(ifa->ifa_flags & IFA_F_SECONDARY))
                              dn_db->parms.timer3(dev, ifa);
                  }
            }
            dn_db->t3 = dn_db->parms.t3;
      } else {
            dn_db->t3 -= dn_db->parms.t2;
      }

      dn_dev_set_timer(dev);
}

static void dn_dev_set_timer(struct net_device *dev)
{
      struct dn_dev *dn_db = dev->dn_ptr;

      if (dn_db->parms.t2 > dn_db->parms.t3)
            dn_db->parms.t2 = dn_db->parms.t3;

      dn_db->timer.data = (unsigned long)dev;
      dn_db->timer.function = dn_dev_timer_func;
      dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);

      add_timer(&dn_db->timer);
}

struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
{
      int i;
      struct dn_dev_parms *p = dn_dev_list;
      struct dn_dev *dn_db;

      for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
            if (p->type == dev->type)
                  break;
      }

      *err = -ENODEV;
      if (i == DN_DEV_LIST_SIZE)
            return NULL;

      *err = -ENOBUFS;
      if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
            return NULL;

      memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
      smp_wmb();
      dev->dn_ptr = dn_db;
      dn_db->dev = dev;
      init_timer(&dn_db->timer);

      dn_db->uptime = jiffies;

      dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
      if (!dn_db->neigh_parms) {
            dev->dn_ptr = NULL;
            kfree(dn_db);
            return NULL;
      }

      if (dn_db->parms.up) {
            if (dn_db->parms.up(dev) < 0) {
                  neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
                  dev->dn_ptr = NULL;
                  kfree(dn_db);
                  return NULL;
            }
      }

      dn_dev_sysctl_register(dev, &dn_db->parms);

      dn_dev_set_timer(dev);

      *err = 0;
      return dn_db;
}


/*
 * This processes a device up event. We only start up
 * the loopback device & ethernet devices with correct
 * MAC addreses automatically. Others must be started
 * specifically.
 *
 * FIXME: How should we configure the loopback address ? If we could dispense
 * with using decnet_address here and for autobind, it will be one less thing
 * for users to worry about setting up.
 */

void dn_dev_up(struct net_device *dev)
{
      struct dn_ifaddr *ifa;
      __le16 addr = decnet_address;
      int maybe_default = 0;
      struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;

      if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
            return;

      /*
       * Need to ensure that loopback device has a dn_db attached to it
       * to allow creation of neighbours against it, even though it might
       * not have a local address of its own. Might as well do the same for
       * all autoconfigured interfaces.
       */
      if (dn_db == NULL) {
            int err;
            dn_db = dn_dev_create(dev, &err);
            if (dn_db == NULL)
                  return;
      }

      if (dev->type == ARPHRD_ETHER) {
            if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
                  return;
            addr = dn_eth2dn(dev->dev_addr);
            maybe_default = 1;
      }

      if (addr == 0)
            return;

      if ((ifa = dn_dev_alloc_ifa()) == NULL)
            return;

      ifa->ifa_local = ifa->ifa_address = addr;
      ifa->ifa_flags = 0;
      ifa->ifa_scope = RT_SCOPE_UNIVERSE;
      strcpy(ifa->ifa_label, dev->name);

      dn_dev_set_ifa(dev, ifa);

      /*
       * Automagically set the default device to the first automatically
       * configured ethernet card in the system.
       */
      if (maybe_default) {
            dev_hold(dev);
            if (dn_dev_set_default(dev, 0))
                  dev_put(dev);
      }
}

static void dn_dev_delete(struct net_device *dev)
{
      struct dn_dev *dn_db = dev->dn_ptr;

      if (dn_db == NULL)
            return;

      del_timer_sync(&dn_db->timer);
      dn_dev_sysctl_unregister(&dn_db->parms);
      dn_dev_check_default(dev);
      neigh_ifdown(&dn_neigh_table, dev);

      if (dn_db->parms.down)
            dn_db->parms.down(dev);

      dev->dn_ptr = NULL;

      neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
      neigh_ifdown(&dn_neigh_table, dev);

      if (dn_db->router)
            neigh_release(dn_db->router);
      if (dn_db->peer)
            neigh_release(dn_db->peer);

      kfree(dn_db);
}

void dn_dev_down(struct net_device *dev)
{
      struct dn_dev *dn_db = dev->dn_ptr;
      struct dn_ifaddr *ifa;

      if (dn_db == NULL)
            return;

      while((ifa = dn_db->ifa_list) != NULL) {
            dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
            dn_dev_free_ifa(ifa);
      }

      dn_dev_delete(dev);
}

void dn_dev_init_pkt(struct sk_buff *skb)
{
      return;
}

void dn_dev_veri_pkt(struct sk_buff *skb)
{
      return;
}

void dn_dev_hello(struct sk_buff *skb)
{
      return;
}

void dn_dev_devices_off(void)
{
      struct net_device *dev;

      rtnl_lock();
      for_each_netdev(&init_net, dev)
            dn_dev_down(dev);
      rtnl_unlock();

}

void dn_dev_devices_on(void)
{
      struct net_device *dev;

      rtnl_lock();
      for_each_netdev(&init_net, dev) {
            if (dev->flags & IFF_UP)
                  dn_dev_up(dev);
      }
      rtnl_unlock();
}

int register_dnaddr_notifier(struct notifier_block *nb)
{
      return blocking_notifier_chain_register(&dnaddr_chain, nb);
}

int unregister_dnaddr_notifier(struct notifier_block *nb)
{
      return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
}

#ifdef CONFIG_PROC_FS
static inline int is_dn_dev(struct net_device *dev)
{
      return dev->dn_ptr != NULL;
}

static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
{
      int i;
      struct net_device *dev;

      read_lock(&dev_base_lock);

      if (*pos == 0)
            return SEQ_START_TOKEN;

      i = 1;
      for_each_netdev(&init_net, dev) {
            if (!is_dn_dev(dev))
                  continue;

            if (i++ == *pos)
                  return dev;
      }

      return NULL;
}

static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
      struct net_device *dev;

      ++*pos;

      dev = (struct net_device *)v;
      if (v == SEQ_START_TOKEN)
            dev = net_device_entry(&init_net.dev_base_head);

      for_each_netdev_continue(&init_net, dev) {
            if (!is_dn_dev(dev))
                  continue;

            return dev;
      }

      return NULL;
}

static void dn_dev_seq_stop(struct seq_file *seq, void *v)
{
      read_unlock(&dev_base_lock);
}

static char *dn_type2asc(char type)
{
      switch(type) {
            case DN_DEV_BCAST:
                  return "B";
            case DN_DEV_UCAST:
                  return "U";
            case DN_DEV_MPOINT:
                  return "M";
      }

      return "?";
}

static int dn_dev_seq_show(struct seq_file *seq, void *v)
{
      if (v == SEQ_START_TOKEN)
            seq_puts(seq, "Name     Flags T1   Timer1 T3   Timer3 BlkSize Pri State DevType    Router Peer\n");
      else {
            struct net_device *dev = v;
            char peer_buf[DN_ASCBUF_LEN];
            char router_buf[DN_ASCBUF_LEN];
            struct dn_dev *dn_db = dev->dn_ptr;

            seq_printf(seq, "%-8s %1s     %04u %04u   %04lu %04lu"
                        "   %04hu    %03d %02x    %-10s %-7s %-7s\n",
                        dev->name ? dev->name : "???",
                        dn_type2asc(dn_db->parms.mode),
                        0, 0,
                        dn_db->t3, dn_db->parms.t3,
                        mtu2blksize(dev),
                        dn_db->parms.priority,
                        dn_db->parms.state, dn_db->parms.name,
                        dn_db->router ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
                        dn_db->peer ? dn_addr2asc(dn_ntohs(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
      }
      return 0;
}

static const struct seq_operations dn_dev_seq_ops = {
      .start      = dn_dev_seq_start,
      .next = dn_dev_seq_next,
      .stop = dn_dev_seq_stop,
      .show = dn_dev_seq_show,
};

static int dn_dev_seq_open(struct inode *inode, struct file *file)
{
      return seq_open(file, &dn_dev_seq_ops);
}

static const struct file_operations dn_dev_seq_fops = {
      .owner       = THIS_MODULE,
      .open  = dn_dev_seq_open,
      .read  = seq_read,
      .llseek      = seq_lseek,
      .release = seq_release,
};

#endif /* CONFIG_PROC_FS */

static int addr[2];
module_param_array(addr, int, NULL, 0444);
MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");

void __init dn_dev_init(void)
{
      if (addr[0] > 63 || addr[0] < 0) {
            printk(KERN_ERR "DECnet: Area must be between 0 and 63");
            return;
      }

      if (addr[1] > 1023 || addr[1] < 0) {
            printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
            return;
      }

      decnet_address = dn_htons((addr[0] << 10) | addr[1]);

      dn_dev_devices_on();

      rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL);
      rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL);
      rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr);

      proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops);

#ifdef CONFIG_SYSCTL
      {
            int i;
            for(i = 0; i < DN_DEV_LIST_SIZE; i++)
                  dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
      }
#endif /* CONFIG_SYSCTL */
}

void __exit dn_dev_cleanup(void)
{
#ifdef CONFIG_SYSCTL
      {
            int i;
            for(i = 0; i < DN_DEV_LIST_SIZE; i++)
                  dn_dev_sysctl_unregister(&dn_dev_list[i]);
      }
#endif /* CONFIG_SYSCTL */

      proc_net_remove(&init_net, "decnet_dev");

      dn_dev_devices_off();
}

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