diff options
Diffstat (limited to 'net/atm/clip.c')
| -rw-r--r-- | net/atm/clip.c | 1045 |
1 files changed, 1045 insertions, 0 deletions
diff --git a/net/atm/clip.c b/net/atm/clip.c new file mode 100644 index 0000000..28dab55 --- /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(©); + skb_migrate(&sk_atm(vcc)->sk_receive_queue, ©); + /* re-process everything received between connection setup and MKIP */ + while ((skb = skb_dequeue(©)) != 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"); |
