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-rw-r--r--net/atm/clip.c1045
1 files changed, 1045 insertions, 0 deletions
diff --git a/net/atm/clip.c b/net/atm/clip.c
new file mode 100644
index 00000000000..28dab55a438
--- /dev/null
+++ b/net/atm/clip.c
@@ -0,0 +1,1045 @@
+/* net/atm/clip.c - RFC1577 Classical IP over ATM */
+
+/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
+
+
+#include <linux/config.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/kernel.h> /* for UINT_MAX */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/wait.h>
+#include <linux/timer.h>
+#include <linux/if_arp.h> /* for some manifest constants */
+#include <linux/notifier.h>
+#include <linux/atm.h>
+#include <linux/atmdev.h>
+#include <linux/atmclip.h>
+#include <linux/atmarp.h>
+#include <linux/ip.h> /* for net/route.h */
+#include <linux/in.h> /* for struct sockaddr_in */
+#include <linux/if.h> /* for IFF_UP */
+#include <linux/inetdevice.h>
+#include <linux/bitops.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/rcupdate.h>
+#include <linux/jhash.h>
+#include <net/route.h> /* for struct rtable and routing */
+#include <net/icmp.h> /* icmp_send */
+#include <asm/param.h> /* for HZ */
+#include <asm/byteorder.h> /* for htons etc. */
+#include <asm/system.h> /* save/restore_flags */
+#include <asm/uaccess.h>
+#include <asm/atomic.h>
+
+#include "common.h"
+#include "resources.h"
+#include "ipcommon.h"
+#include <net/atmclip.h>
+
+
+#if 0
+#define DPRINTK(format,args...) printk(format,##args)
+#else
+#define DPRINTK(format,args...)
+#endif
+
+
+static struct net_device *clip_devs;
+static struct atm_vcc *atmarpd;
+static struct neigh_table clip_tbl;
+static struct timer_list idle_timer;
+static int start_timer = 1;
+
+
+static int to_atmarpd(enum atmarp_ctrl_type type,int itf,unsigned long ip)
+{
+ struct sock *sk;
+ struct atmarp_ctrl *ctrl;
+ struct sk_buff *skb;
+
+ DPRINTK("to_atmarpd(%d)\n",type);
+ if (!atmarpd) return -EUNATCH;
+ skb = alloc_skb(sizeof(struct atmarp_ctrl),GFP_ATOMIC);
+ if (!skb) return -ENOMEM;
+ ctrl = (struct atmarp_ctrl *) skb_put(skb,sizeof(struct atmarp_ctrl));
+ ctrl->type = type;
+ ctrl->itf_num = itf;
+ ctrl->ip = ip;
+ atm_force_charge(atmarpd,skb->truesize);
+
+ sk = sk_atm(atmarpd);
+ skb_queue_tail(&sk->sk_receive_queue, skb);
+ sk->sk_data_ready(sk, skb->len);
+ return 0;
+}
+
+
+static void link_vcc(struct clip_vcc *clip_vcc,struct atmarp_entry *entry)
+{
+ DPRINTK("link_vcc %p to entry %p (neigh %p)\n",clip_vcc,entry,
+ entry->neigh);
+ clip_vcc->entry = entry;
+ clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */
+ clip_vcc->next = entry->vccs;
+ entry->vccs = clip_vcc;
+ entry->neigh->used = jiffies;
+}
+
+
+static void unlink_clip_vcc(struct clip_vcc *clip_vcc)
+{
+ struct atmarp_entry *entry = clip_vcc->entry;
+ struct clip_vcc **walk;
+
+ if (!entry) {
+ printk(KERN_CRIT "!clip_vcc->entry (clip_vcc %p)\n",clip_vcc);
+ return;
+ }
+ spin_lock_bh(&entry->neigh->dev->xmit_lock); /* block clip_start_xmit() */
+ entry->neigh->used = jiffies;
+ for (walk = &entry->vccs; *walk; walk = &(*walk)->next)
+ if (*walk == clip_vcc) {
+ int error;
+
+ *walk = clip_vcc->next; /* atomic */
+ clip_vcc->entry = NULL;
+ if (clip_vcc->xoff)
+ netif_wake_queue(entry->neigh->dev);
+ if (entry->vccs)
+ goto out;
+ entry->expires = jiffies-1;
+ /* force resolution or expiration */
+ error = neigh_update(entry->neigh, NULL, NUD_NONE,
+ NEIGH_UPDATE_F_ADMIN);
+ if (error)
+ printk(KERN_CRIT "unlink_clip_vcc: "
+ "neigh_update failed with %d\n",error);
+ goto out;
+ }
+ printk(KERN_CRIT "ATMARP: unlink_clip_vcc failed (entry %p, vcc "
+ "0x%p)\n",entry,clip_vcc);
+out:
+ spin_unlock_bh(&entry->neigh->dev->xmit_lock);
+}
+
+/* The neighbour entry n->lock is held. */
+static int neigh_check_cb(struct neighbour *n)
+{
+ struct atmarp_entry *entry = NEIGH2ENTRY(n);
+ struct clip_vcc *cv;
+
+ for (cv = entry->vccs; cv; cv = cv->next) {
+ unsigned long exp = cv->last_use + cv->idle_timeout;
+
+ if (cv->idle_timeout && time_after(jiffies, exp)) {
+ DPRINTK("releasing vcc %p->%p of entry %p\n",
+ cv, cv->vcc, entry);
+ vcc_release_async(cv->vcc, -ETIMEDOUT);
+ }
+ }
+
+ if (entry->vccs || time_before(jiffies, entry->expires))
+ return 0;
+
+ if (atomic_read(&n->refcnt) > 1) {
+ struct sk_buff *skb;
+
+ DPRINTK("destruction postponed with ref %d\n",
+ atomic_read(&n->refcnt));
+
+ while ((skb = skb_dequeue(&n->arp_queue)) != NULL)
+ dev_kfree_skb(skb);
+
+ return 0;
+ }
+
+ DPRINTK("expired neigh %p\n",n);
+ return 1;
+}
+
+static void idle_timer_check(unsigned long dummy)
+{
+ write_lock(&clip_tbl.lock);
+ __neigh_for_each_release(&clip_tbl, neigh_check_cb);
+ mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ);
+ write_unlock(&clip_tbl.lock);
+}
+
+static int clip_arp_rcv(struct sk_buff *skb)
+{
+ struct atm_vcc *vcc;
+
+ DPRINTK("clip_arp_rcv\n");
+ vcc = ATM_SKB(skb)->vcc;
+ if (!vcc || !atm_charge(vcc,skb->truesize)) {
+ dev_kfree_skb_any(skb);
+ return 0;
+ }
+ DPRINTK("pushing to %p\n",vcc);
+ DPRINTK("using %p\n",CLIP_VCC(vcc)->old_push);
+ CLIP_VCC(vcc)->old_push(vcc,skb);
+ return 0;
+}
+
+static const unsigned char llc_oui[] = {
+ 0xaa, /* DSAP: non-ISO */
+ 0xaa, /* SSAP: non-ISO */
+ 0x03, /* Ctrl: Unnumbered Information Command PDU */
+ 0x00, /* OUI: EtherType */
+ 0x00,
+ 0x00 };
+
+static void clip_push(struct atm_vcc *vcc,struct sk_buff *skb)
+{
+ struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
+
+ DPRINTK("clip push\n");
+ if (!skb) {
+ DPRINTK("removing VCC %p\n",clip_vcc);
+ if (clip_vcc->entry) unlink_clip_vcc(clip_vcc);
+ clip_vcc->old_push(vcc,NULL); /* pass on the bad news */
+ kfree(clip_vcc);
+ return;
+ }
+ atm_return(vcc,skb->truesize);
+ skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs;
+ /* clip_vcc->entry == NULL if we don't have an IP address yet */
+ if (!skb->dev) {
+ dev_kfree_skb_any(skb);
+ return;
+ }
+ ATM_SKB(skb)->vcc = vcc;
+ skb->mac.raw = skb->data;
+ if (!clip_vcc->encap || skb->len < RFC1483LLC_LEN || memcmp(skb->data,
+ llc_oui,sizeof(llc_oui))) skb->protocol = htons(ETH_P_IP);
+ else {
+ skb->protocol = ((u16 *) skb->data)[3];
+ skb_pull(skb,RFC1483LLC_LEN);
+ if (skb->protocol == htons(ETH_P_ARP)) {
+ PRIV(skb->dev)->stats.rx_packets++;
+ PRIV(skb->dev)->stats.rx_bytes += skb->len;
+ clip_arp_rcv(skb);
+ return;
+ }
+ }
+ clip_vcc->last_use = jiffies;
+ PRIV(skb->dev)->stats.rx_packets++;
+ PRIV(skb->dev)->stats.rx_bytes += skb->len;
+ memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
+ netif_rx(skb);
+}
+
+
+/*
+ * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that
+ * clip_pop is atomic with respect to the critical section in clip_start_xmit.
+ */
+
+
+static void clip_pop(struct atm_vcc *vcc,struct sk_buff *skb)
+{
+ struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
+ struct net_device *dev = skb->dev;
+ int old;
+ unsigned long flags;
+
+ DPRINTK("clip_pop(vcc %p)\n",vcc);
+ clip_vcc->old_pop(vcc,skb);
+ /* skb->dev == NULL in outbound ARP packets */
+ if (!dev) return;
+ spin_lock_irqsave(&PRIV(dev)->xoff_lock,flags);
+ if (atm_may_send(vcc,0)) {
+ old = xchg(&clip_vcc->xoff,0);
+ if (old) netif_wake_queue(dev);
+ }
+ spin_unlock_irqrestore(&PRIV(dev)->xoff_lock,flags);
+}
+
+
+static void clip_neigh_destroy(struct neighbour *neigh)
+{
+ DPRINTK("clip_neigh_destroy (neigh %p)\n",neigh);
+ if (NEIGH2ENTRY(neigh)->vccs)
+ printk(KERN_CRIT "clip_neigh_destroy: vccs != NULL !!!\n");
+ NEIGH2ENTRY(neigh)->vccs = (void *) 0xdeadbeef;
+}
+
+
+static void clip_neigh_solicit(struct neighbour *neigh,struct sk_buff *skb)
+{
+ DPRINTK("clip_neigh_solicit (neigh %p, skb %p)\n",neigh,skb);
+ to_atmarpd(act_need,PRIV(neigh->dev)->number,NEIGH2ENTRY(neigh)->ip);
+}
+
+
+static void clip_neigh_error(struct neighbour *neigh,struct sk_buff *skb)
+{
+#ifndef CONFIG_ATM_CLIP_NO_ICMP
+ icmp_send(skb,ICMP_DEST_UNREACH,ICMP_HOST_UNREACH,0);
+#endif
+ kfree_skb(skb);
+}
+
+
+static struct neigh_ops clip_neigh_ops = {
+ .family = AF_INET,
+ .destructor = clip_neigh_destroy,
+ .solicit = clip_neigh_solicit,
+ .error_report = clip_neigh_error,
+ .output = dev_queue_xmit,
+ .connected_output = dev_queue_xmit,
+ .hh_output = dev_queue_xmit,
+ .queue_xmit = dev_queue_xmit,
+};
+
+
+static int clip_constructor(struct neighbour *neigh)
+{
+ struct atmarp_entry *entry = NEIGH2ENTRY(neigh);
+ struct net_device *dev = neigh->dev;
+ struct in_device *in_dev;
+ struct neigh_parms *parms;
+
+ DPRINTK("clip_constructor (neigh %p, entry %p)\n",neigh,entry);
+ neigh->type = inet_addr_type(entry->ip);
+ if (neigh->type != RTN_UNICAST) return -EINVAL;
+
+ rcu_read_lock();
+ in_dev = rcu_dereference(__in_dev_get(dev));
+ if (!in_dev) {
+ rcu_read_unlock();
+ return -EINVAL;
+ }
+
+ parms = in_dev->arp_parms;
+ __neigh_parms_put(neigh->parms);
+ neigh->parms = neigh_parms_clone(parms);
+ rcu_read_unlock();
+
+ neigh->ops = &clip_neigh_ops;
+ neigh->output = neigh->nud_state & NUD_VALID ?
+ neigh->ops->connected_output : neigh->ops->output;
+ entry->neigh = neigh;
+ entry->vccs = NULL;
+ entry->expires = jiffies-1;
+ return 0;
+}
+
+static u32 clip_hash(const void *pkey, const struct net_device *dev)
+{
+ return jhash_2words(*(u32 *)pkey, dev->ifindex, clip_tbl.hash_rnd);
+}
+
+static struct neigh_table clip_tbl = {
+ .family = AF_INET,
+ .entry_size = sizeof(struct neighbour)+sizeof(struct atmarp_entry),
+ .key_len = 4,
+ .hash = clip_hash,
+ .constructor = clip_constructor,
+ .id = "clip_arp_cache",
+
+ /* parameters are copied from ARP ... */
+ .parms = {
+ .tbl = &clip_tbl,
+ .base_reachable_time = 30 * HZ,
+ .retrans_time = 1 * HZ,
+ .gc_staletime = 60 * HZ,
+ .reachable_time = 30 * HZ,
+ .delay_probe_time = 5 * HZ,
+ .queue_len = 3,
+ .ucast_probes = 3,
+ .mcast_probes = 3,
+ .anycast_delay = 1 * HZ,
+ .proxy_delay = (8 * HZ) / 10,
+ .proxy_qlen = 64,
+ .locktime = 1 * HZ,
+ },
+ .gc_interval = 30 * HZ,
+ .gc_thresh1 = 128,
+ .gc_thresh2 = 512,
+ .gc_thresh3 = 1024,
+};
+
+
+/* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
+
+/*
+ * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means
+ * to allocate the neighbour entry but not to ask atmarpd for resolution. Also,
+ * don't increment the usage count. This is used to create entries in
+ * clip_setentry.
+ */
+
+
+static int clip_encap(struct atm_vcc *vcc,int mode)
+{
+ CLIP_VCC(vcc)->encap = mode;
+ return 0;
+}
+
+
+static int clip_start_xmit(struct sk_buff *skb,struct net_device *dev)
+{
+ struct clip_priv *clip_priv = PRIV(dev);
+ struct atmarp_entry *entry;
+ struct atm_vcc *vcc;
+ int old;
+ unsigned long flags;
+
+ DPRINTK("clip_start_xmit (skb %p)\n",skb);
+ if (!skb->dst) {
+ printk(KERN_ERR "clip_start_xmit: skb->dst == NULL\n");
+ dev_kfree_skb(skb);
+ clip_priv->stats.tx_dropped++;
+ return 0;
+ }
+ if (!skb->dst->neighbour) {
+#if 0
+ skb->dst->neighbour = clip_find_neighbour(skb->dst,1);
+ if (!skb->dst->neighbour) {
+ dev_kfree_skb(skb); /* lost that one */
+ clip_priv->stats.tx_dropped++;
+ return 0;
+ }
+#endif
+ printk(KERN_ERR "clip_start_xmit: NO NEIGHBOUR !\n");
+ dev_kfree_skb(skb);
+ clip_priv->stats.tx_dropped++;
+ return 0;
+ }
+ entry = NEIGH2ENTRY(skb->dst->neighbour);
+ if (!entry->vccs) {
+ if (time_after(jiffies, entry->expires)) {
+ /* should be resolved */
+ entry->expires = jiffies+ATMARP_RETRY_DELAY*HZ;
+ to_atmarpd(act_need,PRIV(dev)->number,entry->ip);
+ }
+ if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
+ skb_queue_tail(&entry->neigh->arp_queue,skb);
+ else {
+ dev_kfree_skb(skb);
+ clip_priv->stats.tx_dropped++;
+ }
+ return 0;
+ }
+ DPRINTK("neigh %p, vccs %p\n",entry,entry->vccs);
+ ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
+ DPRINTK("using neighbour %p, vcc %p\n",skb->dst->neighbour,vcc);
+ if (entry->vccs->encap) {
+ void *here;
+
+ here = skb_push(skb,RFC1483LLC_LEN);
+ memcpy(here,llc_oui,sizeof(llc_oui));
+ ((u16 *) here)[3] = skb->protocol;
+ }
+ atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
+ ATM_SKB(skb)->atm_options = vcc->atm_options;
+ entry->vccs->last_use = jiffies;
+ DPRINTK("atm_skb(%p)->vcc(%p)->dev(%p)\n",skb,vcc,vcc->dev);
+ old = xchg(&entry->vccs->xoff,1); /* assume XOFF ... */
+ if (old) {
+ printk(KERN_WARNING "clip_start_xmit: XOFF->XOFF transition\n");
+ return 0;
+ }
+ clip_priv->stats.tx_packets++;
+ clip_priv->stats.tx_bytes += skb->len;
+ (void) vcc->send(vcc,skb);
+ if (atm_may_send(vcc,0)) {
+ entry->vccs->xoff = 0;
+ return 0;
+ }
+ spin_lock_irqsave(&clip_priv->xoff_lock,flags);
+ netif_stop_queue(dev); /* XOFF -> throttle immediately */
+ barrier();
+ if (!entry->vccs->xoff)
+ netif_start_queue(dev);
+ /* Oh, we just raced with clip_pop. netif_start_queue should be
+ good enough, because nothing should really be asleep because
+ of the brief netif_stop_queue. If this isn't true or if it
+ changes, use netif_wake_queue instead. */
+ spin_unlock_irqrestore(&clip_priv->xoff_lock,flags);
+ return 0;
+}
+
+
+static struct net_device_stats *clip_get_stats(struct net_device *dev)
+{
+ return &PRIV(dev)->stats;
+}
+
+
+static int clip_mkip(struct atm_vcc *vcc,int timeout)
+{
+ struct clip_vcc *clip_vcc;
+ struct sk_buff_head copy;
+ struct sk_buff *skb;
+
+ if (!vcc->push) return -EBADFD;
+ clip_vcc = kmalloc(sizeof(struct clip_vcc),GFP_KERNEL);
+ if (!clip_vcc) return -ENOMEM;
+ DPRINTK("mkip clip_vcc %p vcc %p\n",clip_vcc,vcc);
+ clip_vcc->vcc = vcc;
+ vcc->user_back = clip_vcc;
+ set_bit(ATM_VF_IS_CLIP, &vcc->flags);
+ clip_vcc->entry = NULL;
+ clip_vcc->xoff = 0;
+ clip_vcc->encap = 1;
+ clip_vcc->last_use = jiffies;
+ clip_vcc->idle_timeout = timeout*HZ;
+ clip_vcc->old_push = vcc->push;
+ clip_vcc->old_pop = vcc->pop;
+ vcc->push = clip_push;
+ vcc->pop = clip_pop;
+ skb_queue_head_init(&copy);
+ skb_migrate(&sk_atm(vcc)->sk_receive_queue, &copy);
+ /* re-process everything received between connection setup and MKIP */
+ while ((skb = skb_dequeue(&copy)) != NULL)
+ if (!clip_devs) {
+ atm_return(vcc,skb->truesize);
+ kfree_skb(skb);
+ }
+ else {
+ unsigned int len = skb->len;
+
+ clip_push(vcc,skb);
+ PRIV(skb->dev)->stats.rx_packets--;
+ PRIV(skb->dev)->stats.rx_bytes -= len;
+ }
+ return 0;
+}
+
+
+static int clip_setentry(struct atm_vcc *vcc,u32 ip)
+{
+ struct neighbour *neigh;
+ struct atmarp_entry *entry;
+ int error;
+ struct clip_vcc *clip_vcc;
+ struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1 } } };
+ struct rtable *rt;
+
+ if (vcc->push != clip_push) {
+ printk(KERN_WARNING "clip_setentry: non-CLIP VCC\n");
+ return -EBADF;
+ }
+ clip_vcc = CLIP_VCC(vcc);
+ if (!ip) {
+ if (!clip_vcc->entry) {
+ printk(KERN_ERR "hiding hidden ATMARP entry\n");
+ return 0;
+ }
+ DPRINTK("setentry: remove\n");
+ unlink_clip_vcc(clip_vcc);
+ return 0;
+ }
+ error = ip_route_output_key(&rt,&fl);
+ if (error) return error;
+ neigh = __neigh_lookup(&clip_tbl,&ip,rt->u.dst.dev,1);
+ ip_rt_put(rt);
+ if (!neigh)
+ return -ENOMEM;
+ entry = NEIGH2ENTRY(neigh);
+ if (entry != clip_vcc->entry) {
+ if (!clip_vcc->entry) DPRINTK("setentry: add\n");
+ else {
+ DPRINTK("setentry: update\n");
+ unlink_clip_vcc(clip_vcc);
+ }
+ link_vcc(clip_vcc,entry);
+ }
+ error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
+ NEIGH_UPDATE_F_OVERRIDE|NEIGH_UPDATE_F_ADMIN);
+ neigh_release(neigh);
+ return error;
+}
+
+
+static void clip_setup(struct net_device *dev)
+{
+ dev->hard_start_xmit = clip_start_xmit;
+ /* sg_xmit ... */
+ dev->get_stats = clip_get_stats;
+ dev->type = ARPHRD_ATM;
+ dev->hard_header_len = RFC1483LLC_LEN;
+ dev->mtu = RFC1626_MTU;
+ dev->tx_queue_len = 100; /* "normal" queue (packets) */
+ /* When using a "real" qdisc, the qdisc determines the queue */
+ /* length. tx_queue_len is only used for the default case, */
+ /* without any more elaborate queuing. 100 is a reasonable */
+ /* compromise between decent burst-tolerance and protection */
+ /* against memory hogs. */
+}
+
+
+static int clip_create(int number)
+{
+ struct net_device *dev;
+ struct clip_priv *clip_priv;
+ int error;
+
+ if (number != -1) {
+ for (dev = clip_devs; dev; dev = PRIV(dev)->next)
+ if (PRIV(dev)->number == number) return -EEXIST;
+ }
+ else {
+ number = 0;
+ for (dev = clip_devs; dev; dev = PRIV(dev)->next)
+ if (PRIV(dev)->number >= number)
+ number = PRIV(dev)->number+1;
+ }
+ dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup);
+ if (!dev)
+ return -ENOMEM;
+ clip_priv = PRIV(dev);
+ sprintf(dev->name,"atm%d",number);
+ spin_lock_init(&clip_priv->xoff_lock);
+ clip_priv->number = number;
+ error = register_netdev(dev);
+ if (error) {
+ free_netdev(dev);
+ return error;
+ }
+ clip_priv->next = clip_devs;
+ clip_devs = dev;
+ DPRINTK("registered (net:%s)\n",dev->name);
+ return number;
+}
+
+
+static int clip_device_event(struct notifier_block *this,unsigned long event,
+ void *dev)
+{
+ /* ignore non-CLIP devices */
+ if (((struct net_device *) dev)->type != ARPHRD_ATM ||
+ ((struct net_device *) dev)->hard_start_xmit != clip_start_xmit)
+ return NOTIFY_DONE;
+ switch (event) {
+ case NETDEV_UP:
+ DPRINTK("clip_device_event NETDEV_UP\n");
+ (void) to_atmarpd(act_up,PRIV(dev)->number,0);
+ break;
+ case NETDEV_GOING_DOWN:
+ DPRINTK("clip_device_event NETDEV_DOWN\n");
+ (void) to_atmarpd(act_down,PRIV(dev)->number,0);
+ break;
+ case NETDEV_CHANGE:
+ case NETDEV_CHANGEMTU:
+ DPRINTK("clip_device_event NETDEV_CHANGE*\n");
+ (void) to_atmarpd(act_change,PRIV(dev)->number,0);
+ break;
+ case NETDEV_REBOOT:
+ case NETDEV_REGISTER:
+ case NETDEV_DOWN:
+ DPRINTK("clip_device_event %ld\n",event);
+ /* ignore */
+ break;
+ default:
+ printk(KERN_WARNING "clip_device_event: unknown event "
+ "%ld\n",event);
+ break;
+ }
+ return NOTIFY_DONE;
+}
+
+
+static int clip_inet_event(struct notifier_block *this,unsigned long event,
+ void *ifa)
+{
+ struct in_device *in_dev;
+
+ in_dev = ((struct in_ifaddr *) ifa)->ifa_dev;
+ if (!in_dev || !in_dev->dev) {
+ printk(KERN_WARNING "clip_inet_event: no device\n");
+ return NOTIFY_DONE;
+ }
+ /*
+ * Transitions are of the down-change-up type, so it's sufficient to
+ * handle the change on up.
+ */
+ if (event != NETDEV_UP) return NOTIFY_DONE;
+ return clip_device_event(this,NETDEV_CHANGE,in_dev->dev);
+}
+
+
+static struct notifier_block clip_dev_notifier = {
+ clip_device_event,
+ NULL,
+ 0
+};
+
+
+
+static struct notifier_block clip_inet_notifier = {
+ clip_inet_event,
+ NULL,
+ 0
+};
+
+
+
+static void atmarpd_close(struct atm_vcc *vcc)
+{
+ DPRINTK("atmarpd_close\n");
+ atmarpd = NULL; /* assumed to be atomic */
+ barrier();
+ unregister_inetaddr_notifier(&clip_inet_notifier);
+ unregister_netdevice_notifier(&clip_dev_notifier);
+ if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
+ printk(KERN_ERR "atmarpd_close: closing with requests "
+ "pending\n");
+ skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
+ DPRINTK("(done)\n");
+ module_put(THIS_MODULE);
+}
+
+
+static struct atmdev_ops atmarpd_dev_ops = {
+ .close = atmarpd_close
+};
+
+
+static struct atm_dev atmarpd_dev = {
+ .ops = &atmarpd_dev_ops,
+ .type = "arpd",
+ .number = 999,
+ .lock = SPIN_LOCK_UNLOCKED
+};
+
+
+static int atm_init_atmarp(struct atm_vcc *vcc)
+{
+ if (atmarpd) return -EADDRINUSE;
+ if (start_timer) {
+ start_timer = 0;
+ init_timer(&idle_timer);
+ idle_timer.expires = jiffies+CLIP_CHECK_INTERVAL*HZ;
+ idle_timer.function = idle_timer_check;
+ add_timer(&idle_timer);
+ }
+ atmarpd = vcc;
+ set_bit(ATM_VF_META,&vcc->flags);
+ set_bit(ATM_VF_READY,&vcc->flags);
+ /* allow replies and avoid getting closed if signaling dies */
+ vcc->dev = &atmarpd_dev;
+ vcc_insert_socket(sk_atm(vcc));
+ vcc->push = NULL;
+ vcc->pop = NULL; /* crash */
+ vcc->push_oam = NULL; /* crash */
+ if (register_netdevice_notifier(&clip_dev_notifier))
+ printk(KERN_ERR "register_netdevice_notifier failed\n");
+ if (register_inetaddr_notifier(&clip_inet_notifier))
+ printk(KERN_ERR "register_inetaddr_notifier failed\n");
+ return 0;
+}
+
+static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+ struct atm_vcc *vcc = ATM_SD(sock);
+ int err = 0;
+
+ switch (cmd) {
+ case SIOCMKCLIP:
+ case ATMARPD_CTRL:
+ case ATMARP_MKIP:
+ case ATMARP_SETENTRY:
+ case ATMARP_ENCAP:
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+ break;
+ default:
+ return -ENOIOCTLCMD;
+ }
+
+ switch (cmd) {
+ case SIOCMKCLIP:
+ err = clip_create(arg);
+ break;
+ case ATMARPD_CTRL:
+ err = atm_init_atmarp(vcc);
+ if (!err) {
+ sock->state = SS_CONNECTED;
+ __module_get(THIS_MODULE);
+ }
+ break;
+ case ATMARP_MKIP:
+ err = clip_mkip(vcc ,arg);
+ break;
+ case ATMARP_SETENTRY:
+ err = clip_setentry(vcc, arg);
+ break;
+ case ATMARP_ENCAP:
+ err = clip_encap(vcc, arg);
+ break;
+ }
+ return err;
+}
+
+static struct atm_ioctl clip_ioctl_ops = {
+ .owner = THIS_MODULE,
+ .ioctl = clip_ioctl,
+};
+
+#ifdef CONFIG_PROC_FS
+
+static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
+{
+ static int code[] = { 1,2,10,6,1,0 };
+ static int e164[] = { 1,8,4,6,1,0 };
+
+ if (*addr->sas_addr.pub) {
+ seq_printf(seq, "%s", addr->sas_addr.pub);
+ if (*addr->sas_addr.prv)
+ seq_putc(seq, '+');
+ } else if (!*addr->sas_addr.prv) {
+ seq_printf(seq, "%s", "(none)");
+ return;
+ }
+ if (*addr->sas_addr.prv) {
+ unsigned char *prv = addr->sas_addr.prv;
+ int *fields;
+ int i, j;
+
+ fields = *prv == ATM_AFI_E164 ? e164 : code;
+ for (i = 0; fields[i]; i++) {
+ for (j = fields[i]; j; j--)
+ seq_printf(seq, "%02X", *prv++);
+ if (fields[i+1])
+ seq_putc(seq, '.');
+ }
+ }
+}
+
+/* This means the neighbour entry has no attached VCC objects. */
+#define SEQ_NO_VCC_TOKEN ((void *) 2)
+
+static void atmarp_info(struct seq_file *seq, struct net_device *dev,
+ struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
+{
+ unsigned long exp;
+ char buf[17];
+ int svc, llc, off;
+
+ svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
+ (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC));
+
+ llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
+ clip_vcc->encap);
+
+ if (clip_vcc == SEQ_NO_VCC_TOKEN)
+ exp = entry->neigh->used;
+ else
+ exp = clip_vcc->last_use;
+
+ exp = (jiffies - exp) / HZ;
+
+ seq_printf(seq, "%-6s%-4s%-4s%5ld ",
+ dev->name,
+ svc ? "SVC" : "PVC",
+ llc ? "LLC" : "NULL",
+ exp);
+
+ off = scnprintf(buf, sizeof(buf) - 1, "%d.%d.%d.%d",
+ NIPQUAD(entry->ip));
+ while (off < 16)
+ buf[off++] = ' ';
+ buf[off] = '\0';
+ seq_printf(seq, "%s", buf);
+
+ if (clip_vcc == SEQ_NO_VCC_TOKEN) {
+ if (time_before(jiffies, entry->expires))
+ seq_printf(seq, "(resolving)\n");
+ else
+ seq_printf(seq, "(expired, ref %d)\n",
+ atomic_read(&entry->neigh->refcnt));
+ } else if (!svc) {
+ seq_printf(seq, "%d.%d.%d\n",
+ clip_vcc->vcc->dev->number,
+ clip_vcc->vcc->vpi,
+ clip_vcc->vcc->vci);
+ } else {
+ svc_addr(seq, &clip_vcc->vcc->remote);
+ seq_putc(seq, '\n');
+ }
+}
+
+struct clip_seq_state {
+ /* This member must be first. */
+ struct neigh_seq_state ns;
+
+ /* Local to clip specific iteration. */
+ struct clip_vcc *vcc;
+};
+
+static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e,
+ struct clip_vcc *curr)
+{
+ if (!curr) {
+ curr = e->vccs;
+ if (!curr)
+ return SEQ_NO_VCC_TOKEN;
+ return curr;
+ }
+ if (curr == SEQ_NO_VCC_TOKEN)
+ return NULL;
+
+ curr = curr->next;
+
+ return curr;
+}
+
+static void *clip_seq_vcc_walk(struct clip_seq_state *state,
+ struct atmarp_entry *e, loff_t *pos)
+{
+ struct clip_vcc *vcc = state->vcc;
+
+ vcc = clip_seq_next_vcc(e, vcc);
+ if (vcc && pos != NULL) {
+ while (*pos) {
+ vcc = clip_seq_next_vcc(e, vcc);
+ if (!vcc)
+ break;
+ --(*pos);
+ }
+ }
+ state->vcc = vcc;
+
+ return vcc;
+}
+
+static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
+ struct neighbour *n, loff_t *pos)
+{
+ struct clip_seq_state *state = (struct clip_seq_state *) _state;
+
+ return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos);
+}
+
+static void *clip_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY);
+}
+
+static int clip_seq_show(struct seq_file *seq, void *v)
+{
+ static char atm_arp_banner[] =
+ "IPitf TypeEncp Idle IP address ATM address\n";
+
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(seq, atm_arp_banner);
+ } else {
+ struct clip_seq_state *state = seq->private;
+ struct neighbour *n = v;
+ struct clip_vcc *vcc = state->vcc;
+
+ atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc);
+ }
+ return 0;
+}
+
+static struct seq_operations arp_seq_ops = {
+ .start = clip_seq_start,
+ .next = neigh_seq_next,
+ .stop = neigh_seq_stop,
+ .show = clip_seq_show,
+};
+
+static int arp_seq_open(struct inode *inode, struct file *file)
+{
+ struct clip_seq_state *state;
+ struct seq_file *seq;
+ int rc = -EAGAIN;
+
+ state = kmalloc(sizeof(*state), GFP_KERNEL);
+ if (!state) {
+ rc = -ENOMEM;
+ goto out_kfree;
+ }
+ memset(state, 0, sizeof(*state));
+ state->ns.neigh_sub_iter = clip_seq_sub_iter;
+
+ rc = seq_open(file, &arp_seq_ops);
+ if (rc)
+ goto out_kfree;
+
+ seq = file->private_data;
+ seq->private = state;
+out:
+ return rc;
+
+out_kfree:
+ kfree(state);
+ goto out;
+}
+
+static struct file_operations arp_seq_fops = {
+ .open = arp_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_private,
+ .owner = THIS_MODULE
+};
+#endif
+
+static int __init atm_clip_init(void)
+{
+ neigh_table_init(&clip_tbl);
+
+ clip_tbl_hook = &clip_tbl;
+ register_atm_ioctl(&clip_ioctl_ops);
+
+#ifdef CONFIG_PROC_FS
+{
+ struct proc_dir_entry *p;
+
+ p = create_proc_entry("arp", S_IRUGO, atm_proc_root);
+ if (p)
+ p->proc_fops = &arp_seq_fops;
+}
+#endif
+
+ return 0;
+}
+
+static void __exit atm_clip_exit(void)
+{
+ struct net_device *dev, *next;
+
+ remove_proc_entry("arp", atm_proc_root);
+
+ deregister_atm_ioctl(&clip_ioctl_ops);
+
+ /* First, stop the idle timer, so it stops banging
+ * on the table.
+ */
+ if (start_timer == 0)
+ del_timer(&idle_timer);
+
+ /* Next, purge the table, so that the device
+ * unregister loop below does not hang due to
+ * device references remaining in the table.
+ */
+ neigh_ifdown(&clip_tbl, NULL);
+
+ dev = clip_devs;
+ while (dev) {
+ next = PRIV(dev)->next;
+ unregister_netdev(dev);
+ free_netdev(dev);
+ dev = next;
+ }
+
+ /* Now it is safe to fully shutdown whole table. */
+ neigh_table_clear(&clip_tbl);
+
+ clip_tbl_hook = NULL;
+}
+
+module_init(atm_clip_init);
+module_exit(atm_clip_exit);
+
+MODULE_LICENSE("GPL");