2005-04-17 00:20:36 +02:00
|
|
|
/* net/atm/clip.c - RFC1577 Classical IP over ATM */
|
|
|
|
|
|
|
|
/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
|
|
|
|
|
|
|
|
#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>
|
2006-01-11 21:17:47 +01:00
|
|
|
#include <linux/capability.h>
|
2005-04-17 00:20:36 +02:00
|
|
|
#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>
|
2006-07-04 04:47:27 +02:00
|
|
|
#include <linux/poison.h>
|
2005-04-17 00:20:36 +02:00
|
|
|
#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 <net/atmclip.h>
|
|
|
|
|
|
|
|
static struct net_device *clip_devs;
|
|
|
|
static struct atm_vcc *atmarpd;
|
|
|
|
static struct neigh_table clip_tbl;
|
|
|
|
static struct timer_list idle_timer;
|
|
|
|
|
2006-11-15 06:11:29 +01:00
|
|
|
static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
struct sock *sk;
|
|
|
|
struct atmarp_ctrl *ctrl;
|
|
|
|
struct sk_buff *skb;
|
|
|
|
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("to_atmarpd(%d)\n", type);
|
2006-04-15 00:59:37 +02:00
|
|
|
if (!atmarpd)
|
|
|
|
return -EUNATCH;
|
2005-04-17 00:20:36 +02:00
|
|
|
skb = alloc_skb(sizeof(struct atmarp_ctrl),GFP_ATOMIC);
|
2006-04-15 00:59:37 +02:00
|
|
|
if (!skb)
|
|
|
|
return -ENOMEM;
|
2005-04-17 00:20:36 +02:00
|
|
|
ctrl = (struct atmarp_ctrl *) skb_put(skb,sizeof(struct atmarp_ctrl));
|
|
|
|
ctrl->type = type;
|
|
|
|
ctrl->itf_num = itf;
|
|
|
|
ctrl->ip = ip;
|
2006-04-15 00:59:37 +02:00
|
|
|
atm_force_charge(atmarpd, skb->truesize);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
sk = sk_atm(atmarpd);
|
|
|
|
skb_queue_tail(&sk->sk_receive_queue, skb);
|
|
|
|
sk->sk_data_ready(sk, skb->len);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2006-04-15 00:59:37 +02:00
|
|
|
static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("link_vcc %p to entry %p (neigh %p)\n", clip_vcc, entry,
|
2006-04-15 00:59:37 +02:00
|
|
|
entry->neigh);
|
2005-04-17 00:20:36 +02:00
|
|
|
clip_vcc->entry = entry;
|
2006-04-15 00:59:37 +02:00
|
|
|
clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */
|
2005-04-17 00:20:36 +02:00
|
|
|
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) {
|
2006-04-15 00:59:37 +02:00
|
|
|
printk(KERN_CRIT "!clip_vcc->entry (clip_vcc %p)\n", clip_vcc);
|
2005-04-17 00:20:36 +02:00
|
|
|
return;
|
|
|
|
}
|
2006-06-09 21:20:56 +02:00
|
|
|
netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */
|
2005-04-17 00:20:36 +02:00
|
|
|
entry->neigh->used = jiffies;
|
|
|
|
for (walk = &entry->vccs; *walk; walk = &(*walk)->next)
|
|
|
|
if (*walk == clip_vcc) {
|
|
|
|
int error;
|
|
|
|
|
2006-04-15 00:59:37 +02:00
|
|
|
*walk = clip_vcc->next; /* atomic */
|
2005-04-17 00:20:36 +02:00
|
|
|
clip_vcc->entry = NULL;
|
|
|
|
if (clip_vcc->xoff)
|
|
|
|
netif_wake_queue(entry->neigh->dev);
|
|
|
|
if (entry->vccs)
|
|
|
|
goto out;
|
2006-04-15 00:59:37 +02:00
|
|
|
entry->expires = jiffies - 1;
|
|
|
|
/* force resolution or expiration */
|
2005-04-17 00:20:36 +02:00
|
|
|
error = neigh_update(entry->neigh, NULL, NUD_NONE,
|
|
|
|
NEIGH_UPDATE_F_ADMIN);
|
|
|
|
if (error)
|
|
|
|
printk(KERN_CRIT "unlink_clip_vcc: "
|
2006-04-15 00:59:37 +02:00
|
|
|
"neigh_update failed with %d\n", error);
|
2005-04-17 00:20:36 +02:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
printk(KERN_CRIT "ATMARP: unlink_clip_vcc failed (entry %p, vcc "
|
2006-04-15 00:59:37 +02:00
|
|
|
"0x%p)\n", entry, clip_vcc);
|
|
|
|
out:
|
2006-06-09 21:20:56 +02:00
|
|
|
netif_tx_unlock_bh(entry->neigh->dev);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/* 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)) {
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("releasing vcc %p->%p of entry %p\n",
|
2005-04-17 00:20:36 +02:00
|
|
|
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;
|
|
|
|
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("destruction postponed with ref %d\n",
|
2005-04-17 00:20:36 +02:00
|
|
|
atomic_read(&n->refcnt));
|
|
|
|
|
2006-04-15 00:59:37 +02:00
|
|
|
while ((skb = skb_dequeue(&n->arp_queue)) != NULL)
|
2005-04-17 00:20:36 +02:00
|
|
|
dev_kfree_skb(skb);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("expired neigh %p\n", n);
|
2005-04-17 00:20:36 +02:00
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void idle_timer_check(unsigned long dummy)
|
|
|
|
{
|
|
|
|
write_lock(&clip_tbl.lock);
|
|
|
|
__neigh_for_each_release(&clip_tbl, neigh_check_cb);
|
2006-04-15 00:59:37 +02:00
|
|
|
mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
|
2005-04-17 00:20:36 +02:00
|
|
|
write_unlock(&clip_tbl.lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int clip_arp_rcv(struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
struct atm_vcc *vcc;
|
|
|
|
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("clip_arp_rcv\n");
|
2005-04-17 00:20:36 +02:00
|
|
|
vcc = ATM_SKB(skb)->vcc;
|
2006-04-15 00:59:37 +02:00
|
|
|
if (!vcc || !atm_charge(vcc, skb->truesize)) {
|
2005-04-17 00:20:36 +02:00
|
|
|
dev_kfree_skb_any(skb);
|
|
|
|
return 0;
|
|
|
|
}
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("pushing to %p\n", vcc);
|
|
|
|
pr_debug("using %p\n", CLIP_VCC(vcc)->old_push);
|
2006-04-15 00:59:37 +02:00
|
|
|
CLIP_VCC(vcc)->old_push(vcc, skb);
|
2005-04-17 00:20:36 +02:00
|
|
|
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,
|
2006-04-15 00:59:37 +02:00
|
|
|
0x00
|
|
|
|
};
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2006-04-15 00:59:37 +02:00
|
|
|
static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
|
|
|
|
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("clip push\n");
|
2005-04-17 00:20:36 +02:00
|
|
|
if (!skb) {
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("removing VCC %p\n", clip_vcc);
|
2006-04-15 00:59:37 +02:00
|
|
|
if (clip_vcc->entry)
|
|
|
|
unlink_clip_vcc(clip_vcc);
|
|
|
|
clip_vcc->old_push(vcc, NULL); /* pass on the bad news */
|
2005-04-17 00:20:36 +02:00
|
|
|
kfree(clip_vcc);
|
|
|
|
return;
|
|
|
|
}
|
2006-04-15 00:59:37 +02:00
|
|
|
atm_return(vcc, skb->truesize);
|
2005-04-17 00:20:36 +02:00
|
|
|
skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs;
|
2006-04-15 00:59:37 +02:00
|
|
|
/* clip_vcc->entry == NULL if we don't have an IP address yet */
|
2005-04-17 00:20:36 +02:00
|
|
|
if (!skb->dev) {
|
|
|
|
dev_kfree_skb_any(skb);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
ATM_SKB(skb)->vcc = vcc;
|
2007-03-19 23:30:44 +01:00
|
|
|
skb_reset_mac_header(skb);
|
2006-04-15 00:59:37 +02:00
|
|
|
if (!clip_vcc->encap
|
|
|
|
|| skb->len < RFC1483LLC_LEN
|
|
|
|
|| memcmp(skb->data, llc_oui, sizeof (llc_oui)))
|
|
|
|
skb->protocol = htons(ETH_P_IP);
|
2005-04-17 00:20:36 +02:00
|
|
|
else {
|
2006-11-15 06:11:29 +01:00
|
|
|
skb->protocol = ((__be16 *) skb->data)[3];
|
2006-04-15 00:59:37 +02:00
|
|
|
skb_pull(skb, RFC1483LLC_LEN);
|
2005-04-17 00:20:36 +02:00
|
|
|
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.
|
|
|
|
*/
|
|
|
|
|
2006-04-15 00:59:37 +02:00
|
|
|
static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
|
|
|
|
struct net_device *dev = skb->dev;
|
|
|
|
int old;
|
|
|
|
unsigned long flags;
|
|
|
|
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("clip_pop(vcc %p)\n", vcc);
|
2006-04-15 00:59:37 +02:00
|
|
|
clip_vcc->old_pop(vcc, skb);
|
2005-04-17 00:20:36 +02:00
|
|
|
/* skb->dev == NULL in outbound ARP packets */
|
2006-04-15 00:59:37 +02:00
|
|
|
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);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
2006-04-15 00:59:37 +02:00
|
|
|
spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2006-04-15 00:59:37 +02:00
|
|
|
static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("clip_neigh_solicit (neigh %p, skb %p)\n", neigh, skb);
|
2006-04-15 00:59:37 +02:00
|
|
|
to_atmarpd(act_need, PRIV(neigh->dev)->number, NEIGH2ENTRY(neigh)->ip);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2006-04-15 00:59:37 +02:00
|
|
|
static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
#ifndef CONFIG_ATM_CLIP_NO_ICMP
|
2006-04-15 00:59:37 +02:00
|
|
|
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
|
2005-04-17 00:20:36 +02:00
|
|
|
#endif
|
|
|
|
kfree_skb(skb);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct neigh_ops clip_neigh_ops = {
|
|
|
|
.family = AF_INET,
|
|
|
|
.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;
|
|
|
|
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("clip_constructor (neigh %p, entry %p)\n", neigh, entry);
|
2008-01-10 12:25:28 +01:00
|
|
|
neigh->type = inet_addr_type(&init_net, entry->ip);
|
2006-04-15 00:59:37 +02:00
|
|
|
if (neigh->type != RTN_UNICAST)
|
|
|
|
return -EINVAL;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
rcu_read_lock();
|
2005-10-03 23:35:55 +02:00
|
|
|
in_dev = __in_dev_get_rcu(dev);
|
2005-04-17 00:20:36 +02:00
|
|
|
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;
|
2006-04-15 00:59:37 +02:00
|
|
|
entry->expires = jiffies - 1;
|
2005-04-17 00:20:36 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static u32 clip_hash(const void *pkey, const struct net_device *dev)
|
|
|
|
{
|
2006-04-15 00:59:37 +02:00
|
|
|
return jhash_2words(*(u32 *) pkey, dev->ifindex, clip_tbl.hash_rnd);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
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.
|
|
|
|
*/
|
|
|
|
|
2006-04-15 00:59:37 +02:00
|
|
|
static int clip_encap(struct atm_vcc *vcc, int mode)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
CLIP_VCC(vcc)->encap = mode;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2006-04-15 00:59:37 +02:00
|
|
|
static int clip_start_xmit(struct sk_buff *skb, struct net_device *dev)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
struct clip_priv *clip_priv = PRIV(dev);
|
|
|
|
struct atmarp_entry *entry;
|
|
|
|
struct atm_vcc *vcc;
|
|
|
|
int old;
|
|
|
|
unsigned long flags;
|
|
|
|
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("clip_start_xmit (skb %p)\n", skb);
|
2005-04-17 00:20:36 +02:00
|
|
|
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
|
2006-04-15 00:59:37 +02:00
|
|
|
skb->dst->neighbour = clip_find_neighbour(skb->dst, 1);
|
2005-04-17 00:20:36 +02:00
|
|
|
if (!skb->dst->neighbour) {
|
2006-04-15 00:59:37 +02:00
|
|
|
dev_kfree_skb(skb); /* lost that one */
|
2005-04-17 00:20:36 +02:00
|
|
|
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 */
|
2006-04-15 00:59:37 +02:00
|
|
|
entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ;
|
|
|
|
to_atmarpd(act_need, PRIV(dev)->number, entry->ip);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
|
2006-04-15 00:59:37 +02:00
|
|
|
skb_queue_tail(&entry->neigh->arp_queue, skb);
|
2005-04-17 00:20:36 +02:00
|
|
|
else {
|
|
|
|
dev_kfree_skb(skb);
|
|
|
|
clip_priv->stats.tx_dropped++;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("neigh %p, vccs %p\n", entry, entry->vccs);
|
2005-04-17 00:20:36 +02:00
|
|
|
ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("using neighbour %p, vcc %p\n", skb->dst->neighbour, vcc);
|
2005-04-17 00:20:36 +02:00
|
|
|
if (entry->vccs->encap) {
|
|
|
|
void *here;
|
|
|
|
|
2006-04-15 00:59:37 +02:00
|
|
|
here = skb_push(skb, RFC1483LLC_LEN);
|
|
|
|
memcpy(here, llc_oui, sizeof(llc_oui));
|
2006-11-15 06:11:29 +01:00
|
|
|
((__be16 *) here)[3] = skb->protocol;
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
|
|
|
|
ATM_SKB(skb)->atm_options = vcc->atm_options;
|
|
|
|
entry->vccs->last_use = jiffies;
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev);
|
2006-04-15 00:59:37 +02:00
|
|
|
old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */
|
2005-04-17 00:20:36 +02:00
|
|
|
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;
|
2006-04-15 01:00:59 +02:00
|
|
|
vcc->send(vcc, skb);
|
2006-04-15 00:59:37 +02:00
|
|
|
if (atm_may_send(vcc, 0)) {
|
2005-04-17 00:20:36 +02:00
|
|
|
entry->vccs->xoff = 0;
|
|
|
|
return 0;
|
|
|
|
}
|
2006-04-15 00:59:37 +02:00
|
|
|
spin_lock_irqsave(&clip_priv->xoff_lock, flags);
|
|
|
|
netif_stop_queue(dev); /* XOFF -> throttle immediately */
|
2005-04-17 00:20:36 +02:00
|
|
|
barrier();
|
|
|
|
if (!entry->vccs->xoff)
|
|
|
|
netif_start_queue(dev);
|
2006-04-15 00:59:37 +02:00
|
|
|
/* 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);
|
2005-04-17 00:20:36 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct net_device_stats *clip_get_stats(struct net_device *dev)
|
|
|
|
{
|
|
|
|
return &PRIV(dev)->stats;
|
|
|
|
}
|
|
|
|
|
2006-04-15 00:59:37 +02:00
|
|
|
static int clip_mkip(struct atm_vcc *vcc, int timeout)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
struct clip_vcc *clip_vcc;
|
|
|
|
struct sk_buff *skb;
|
2006-12-01 06:05:23 +01:00
|
|
|
struct sk_buff_head *rq;
|
|
|
|
unsigned long flags;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2006-04-15 00:59:37 +02:00
|
|
|
if (!vcc->push)
|
|
|
|
return -EBADFD;
|
|
|
|
clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL);
|
|
|
|
if (!clip_vcc)
|
|
|
|
return -ENOMEM;
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("mkip clip_vcc %p vcc %p\n", clip_vcc, vcc);
|
2005-04-17 00:20:36 +02:00
|
|
|
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;
|
2006-04-15 00:59:37 +02:00
|
|
|
clip_vcc->idle_timeout = timeout * HZ;
|
2005-04-17 00:20:36 +02:00
|
|
|
clip_vcc->old_push = vcc->push;
|
|
|
|
clip_vcc->old_pop = vcc->pop;
|
|
|
|
vcc->push = clip_push;
|
|
|
|
vcc->pop = clip_pop;
|
2006-12-01 06:05:23 +01:00
|
|
|
|
|
|
|
rq = &sk_atm(vcc)->sk_receive_queue;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&rq->lock, flags);
|
|
|
|
if (skb_queue_empty(rq)) {
|
|
|
|
skb = NULL;
|
|
|
|
} else {
|
|
|
|
/* NULL terminate the list. */
|
|
|
|
rq->prev->next = NULL;
|
|
|
|
skb = rq->next;
|
|
|
|
}
|
|
|
|
rq->prev = rq->next = (struct sk_buff *)rq;
|
|
|
|
rq->qlen = 0;
|
|
|
|
spin_unlock_irqrestore(&rq->lock, flags);
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/* re-process everything received between connection setup and MKIP */
|
2006-12-01 06:05:23 +01:00
|
|
|
while (skb) {
|
|
|
|
struct sk_buff *next = skb->next;
|
|
|
|
|
|
|
|
skb->next = skb->prev = NULL;
|
2005-04-17 00:20:36 +02:00
|
|
|
if (!clip_devs) {
|
2006-04-15 00:59:37 +02:00
|
|
|
atm_return(vcc, skb->truesize);
|
2005-04-17 00:20:36 +02:00
|
|
|
kfree_skb(skb);
|
2006-04-15 00:59:37 +02:00
|
|
|
} else {
|
2005-04-17 00:20:36 +02:00
|
|
|
unsigned int len = skb->len;
|
|
|
|
|
2006-09-18 15:37:58 +02:00
|
|
|
skb_get(skb);
|
2006-04-15 00:59:37 +02:00
|
|
|
clip_push(vcc, skb);
|
2005-04-17 00:20:36 +02:00
|
|
|
PRIV(skb->dev)->stats.rx_packets--;
|
|
|
|
PRIV(skb->dev)->stats.rx_bytes -= len;
|
2006-09-18 15:37:58 +02:00
|
|
|
kfree_skb(skb);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
2006-12-01 06:05:23 +01:00
|
|
|
|
|
|
|
skb = next;
|
|
|
|
}
|
2005-04-17 00:20:36 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2006-11-15 06:11:29 +01:00
|
|
|
static int clip_setentry(struct atm_vcc *vcc, __be32 ip)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
struct neighbour *neigh;
|
|
|
|
struct atmarp_entry *entry;
|
|
|
|
int error;
|
|
|
|
struct clip_vcc *clip_vcc;
|
2006-04-15 00:59:37 +02:00
|
|
|
struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1}} };
|
2005-04-17 00:20:36 +02:00
|
|
|
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;
|
|
|
|
}
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("setentry: remove\n");
|
2005-04-17 00:20:36 +02:00
|
|
|
unlink_clip_vcc(clip_vcc);
|
|
|
|
return 0;
|
|
|
|
}
|
2008-01-23 07:07:34 +01:00
|
|
|
error = ip_route_output_key(&init_net, &rt, &fl);
|
2006-04-15 00:59:37 +02:00
|
|
|
if (error)
|
|
|
|
return error;
|
|
|
|
neigh = __neigh_lookup(&clip_tbl, &ip, rt->u.dst.dev, 1);
|
2005-04-17 00:20:36 +02:00
|
|
|
ip_rt_put(rt);
|
|
|
|
if (!neigh)
|
|
|
|
return -ENOMEM;
|
|
|
|
entry = NEIGH2ENTRY(neigh);
|
|
|
|
if (entry != clip_vcc->entry) {
|
2006-04-15 00:59:37 +02:00
|
|
|
if (!clip_vcc->entry)
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("setentry: add\n");
|
2005-04-17 00:20:36 +02:00
|
|
|
else {
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("setentry: update\n");
|
2005-04-17 00:20:36 +02:00
|
|
|
unlink_clip_vcc(clip_vcc);
|
|
|
|
}
|
2006-04-15 00:59:37 +02:00
|
|
|
link_vcc(clip_vcc, entry);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
2006-04-15 00:59:37 +02:00
|
|
|
error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
|
|
|
|
NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN);
|
2005-04-17 00:20:36 +02:00
|
|
|
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;
|
2006-04-15 00:59:37 +02:00
|
|
|
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. */
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
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)
|
2006-04-15 00:59:37 +02:00
|
|
|
if (PRIV(dev)->number == number)
|
|
|
|
return -EEXIST;
|
|
|
|
} else {
|
2005-04-17 00:20:36 +02:00
|
|
|
number = 0;
|
|
|
|
for (dev = clip_devs; dev; dev = PRIV(dev)->next)
|
|
|
|
if (PRIV(dev)->number >= number)
|
2006-04-15 00:59:37 +02:00
|
|
|
number = PRIV(dev)->number + 1;
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup);
|
|
|
|
if (!dev)
|
|
|
|
return -ENOMEM;
|
|
|
|
clip_priv = PRIV(dev);
|
2006-04-15 00:59:37 +02:00
|
|
|
sprintf(dev->name, "atm%d", number);
|
2005-04-17 00:20:36 +02:00
|
|
|
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;
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("registered (net:%s)\n", dev->name);
|
2005-04-17 00:20:36 +02:00
|
|
|
return number;
|
|
|
|
}
|
|
|
|
|
2006-04-15 00:59:37 +02:00
|
|
|
static int clip_device_event(struct notifier_block *this, unsigned long event,
|
2006-04-15 00:07:27 +02:00
|
|
|
void *arg)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2006-04-15 00:07:27 +02:00
|
|
|
struct net_device *dev = arg;
|
|
|
|
|
2008-07-20 07:34:43 +02:00
|
|
|
if (!net_eq(dev_net(dev), &init_net))
|
2007-09-12 13:02:17 +02:00
|
|
|
return NOTIFY_DONE;
|
|
|
|
|
2006-04-15 00:07:27 +02:00
|
|
|
if (event == NETDEV_UNREGISTER) {
|
|
|
|
neigh_ifdown(&clip_tbl, dev);
|
|
|
|
return NOTIFY_DONE;
|
|
|
|
}
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/* ignore non-CLIP devices */
|
2006-04-15 00:07:27 +02:00
|
|
|
if (dev->type != ARPHRD_ATM || dev->hard_start_xmit != clip_start_xmit)
|
2005-04-17 00:20:36 +02:00
|
|
|
return NOTIFY_DONE;
|
2006-04-15 00:07:27 +02:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
switch (event) {
|
2006-04-15 00:59:37 +02:00
|
|
|
case NETDEV_UP:
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("clip_device_event NETDEV_UP\n");
|
2006-04-15 01:00:59 +02:00
|
|
|
to_atmarpd(act_up, PRIV(dev)->number, 0);
|
2006-04-15 00:59:37 +02:00
|
|
|
break;
|
|
|
|
case NETDEV_GOING_DOWN:
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("clip_device_event NETDEV_DOWN\n");
|
2006-04-15 01:00:59 +02:00
|
|
|
to_atmarpd(act_down, PRIV(dev)->number, 0);
|
2006-04-15 00:59:37 +02:00
|
|
|
break;
|
|
|
|
case NETDEV_CHANGE:
|
|
|
|
case NETDEV_CHANGEMTU:
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("clip_device_event NETDEV_CHANGE*\n");
|
2006-04-15 01:00:59 +02:00
|
|
|
to_atmarpd(act_change, PRIV(dev)->number, 0);
|
2006-04-15 00:59:37 +02:00
|
|
|
break;
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
|
|
}
|
|
|
|
|
2006-04-15 00:59:37 +02:00
|
|
|
static int clip_inet_event(struct notifier_block *this, unsigned long event,
|
|
|
|
void *ifa)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
struct in_device *in_dev;
|
|
|
|
|
2006-04-15 00:59:37 +02:00
|
|
|
in_dev = ((struct in_ifaddr *)ifa)->ifa_dev;
|
2005-04-17 00:20:36 +02:00
|
|
|
/*
|
|
|
|
* Transitions are of the down-change-up type, so it's sufficient to
|
|
|
|
* handle the change on up.
|
|
|
|
*/
|
2006-04-15 00:59:37 +02:00
|
|
|
if (event != NETDEV_UP)
|
|
|
|
return NOTIFY_DONE;
|
|
|
|
return clip_device_event(this, NETDEV_CHANGE, in_dev->dev);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static struct notifier_block clip_dev_notifier = {
|
2006-04-15 01:00:59 +02:00
|
|
|
.notifier_call = clip_device_event,
|
2005-04-17 00:20:36 +02:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
static struct notifier_block clip_inet_notifier = {
|
2006-04-15 01:00:59 +02:00
|
|
|
.notifier_call = clip_inet_event,
|
2005-04-17 00:20:36 +02:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
static void atmarpd_close(struct atm_vcc *vcc)
|
|
|
|
{
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("atmarpd_close\n");
|
2006-04-15 00:07:27 +02:00
|
|
|
|
|
|
|
rtnl_lock();
|
|
|
|
atmarpd = NULL;
|
2005-04-17 00:20:36 +02:00
|
|
|
skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
|
2006-04-15 00:07:27 +02:00
|
|
|
rtnl_unlock();
|
|
|
|
|
2007-08-29 00:22:09 +02:00
|
|
|
pr_debug("(done)\n");
|
2005-04-17 00:20:36 +02:00
|
|
|
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,
|
2007-04-26 10:37:44 +02:00
|
|
|
.lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock)
|
2005-04-17 00:20:36 +02:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
static int atm_init_atmarp(struct atm_vcc *vcc)
|
|
|
|
{
|
2006-04-15 00:07:27 +02:00
|
|
|
rtnl_lock();
|
|
|
|
if (atmarpd) {
|
|
|
|
rtnl_unlock();
|
|
|
|
return -EADDRINUSE;
|
|
|
|
}
|
|
|
|
|
2006-04-15 00:56:02 +02:00
|
|
|
mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ);
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
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 */
|
2006-04-15 00:07:27 +02:00
|
|
|
rtnl_unlock();
|
2005-04-17 00:20:36 +02:00
|
|
|
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) {
|
2006-04-15 00:59:37 +02:00
|
|
|
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;
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
switch (cmd) {
|
2006-04-15 00:59:37 +02:00
|
|
|
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:
|
2006-11-15 06:11:29 +01:00
|
|
|
err = clip_setentry(vcc, (__force __be32)arg);
|
2006-04-15 00:59:37 +02:00
|
|
|
break;
|
|
|
|
case ATMARP_ENCAP:
|
|
|
|
err = clip_encap(vcc, arg);
|
|
|
|
break;
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct atm_ioctl clip_ioctl_ops = {
|
2006-04-15 00:59:37 +02:00
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.ioctl = clip_ioctl,
|
2005-04-17 00:20:36 +02:00
|
|
|
};
|
|
|
|
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
|
|
|
|
static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
|
|
|
|
{
|
2006-04-15 00:59:37 +02:00
|
|
|
static int code[] = { 1, 2, 10, 6, 1, 0 };
|
|
|
|
static int e164[] = { 1, 8, 4, 6, 1, 0 };
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
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++);
|
2006-04-15 00:59:37 +02:00
|
|
|
if (fields[i + 1])
|
2005-04-17 00:20:36 +02:00
|
|
|
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));
|
|
|
|
|
2006-04-15 00:59:37 +02:00
|
|
|
llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
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 ",
|
2006-04-15 00:59:37 +02:00
|
|
|
dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2008-10-31 08:54:56 +01:00
|
|
|
off = scnprintf(buf, sizeof(buf) - 1, "%pI4",
|
|
|
|
&entry->ip);
|
2005-04-17 00:20:36 +02:00
|
|
|
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,
|
2006-04-15 00:59:37 +02:00
|
|
|
clip_vcc->vcc->vpi, clip_vcc->vcc->vci);
|
2005-04-17 00:20:36 +02:00
|
|
|
} 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,
|
2006-04-15 00:59:37 +02:00
|
|
|
struct atmarp_entry *e, loff_t * pos)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
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;
|
|
|
|
}
|
2006-04-15 00:59:37 +02:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
|
2006-04-15 00:59:37 +02:00
|
|
|
struct neighbour *n, loff_t * pos)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2006-04-15 00:59:37 +02:00
|
|
|
struct clip_seq_state *state = (struct clip_seq_state *)_state;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos);
|
|
|
|
}
|
|
|
|
|
2006-04-15 00:59:37 +02:00
|
|
|
static void *clip_seq_start(struct seq_file *seq, loff_t * pos)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2008-01-10 12:52:35 +01:00
|
|
|
struct clip_seq_state *state = seq->private;
|
|
|
|
state->ns.neigh_sub_iter = clip_seq_sub_iter;
|
2005-04-17 00:20:36 +02:00
|
|
|
return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int clip_seq_show(struct seq_file *seq, void *v)
|
|
|
|
{
|
2006-04-15 00:59:37 +02:00
|
|
|
static char atm_arp_banner[] =
|
|
|
|
"IPitf TypeEncp Idle IP address ATM address\n";
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
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);
|
|
|
|
}
|
2006-04-15 00:59:37 +02:00
|
|
|
return 0;
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2007-07-11 08:07:31 +02:00
|
|
|
static const struct seq_operations arp_seq_ops = {
|
2005-04-17 00:20:36 +02:00
|
|
|
.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)
|
|
|
|
{
|
2008-01-10 12:52:35 +01:00
|
|
|
return seq_open_net(inode, file, &arp_seq_ops,
|
|
|
|
sizeof(struct clip_seq_state));
|
2008-01-24 09:13:18 +01:00
|
|
|
}
|
|
|
|
|
2007-02-12 09:55:35 +01:00
|
|
|
static const struct file_operations arp_seq_fops = {
|
2005-04-17 00:20:36 +02:00
|
|
|
.open = arp_seq_open,
|
|
|
|
.read = seq_read,
|
|
|
|
.llseek = seq_lseek,
|
2008-01-10 12:52:35 +01:00
|
|
|
.release = seq_release_net,
|
2005-04-17 00:20:36 +02:00
|
|
|
.owner = THIS_MODULE
|
|
|
|
};
|
|
|
|
#endif
|
|
|
|
|
2008-03-24 05:45:36 +01:00
|
|
|
static void atm_clip_exit_noproc(void);
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
static int __init atm_clip_init(void)
|
|
|
|
{
|
[NEIGH]: Fix IP-over-ATM and ARP interaction.
The classical IP over ATM code maintains its own IPv4 <-> <ATM stuff>
ARP table, using the standard neighbour-table code. The
neigh_table_init function adds this neighbour table to a linked list
of all neighbor tables which is used by the functions neigh_delete()
neigh_add() and neightbl_set(), all called by the netlink code.
Once the ATM neighbour table is added to the list, there are two
tables with family == AF_INET there, and ARP entries sent via netlink
go into the first table with matching family. This is indeterminate
and often wrong.
To see the bug, on a kernel with CLIP enabled, create a standard IPv4
ARP entry by pinging an unused address on a local subnet. Then attempt
to complete that entry by doing
ip neigh replace <ip address> lladdr <some mac address> nud reachable
Looking at the ARP tables by using
ip neigh show
will reveal two ARP entries for the same address. One of these can be
found in /proc/net/arp, and the other in /proc/net/atm/arp.
This patch adds a new function, neigh_table_init_no_netlink() which
does everything the neigh_table_init() does, except add the table to
the netlink all-arp-tables chain. In addition neigh_table_init() has a
check that all tables on the chain have a distinct address family.
The init call in clip.c is changed to call
neigh_table_init_no_netlink().
Since ATM ARP tables are rather more complicated than can currently be
handled by the available rtattrs in the netlink protocol, no
functionality is lost by this patch, and non-ATM ARP manipulation via
netlink is rescued. A more complete solution would involve a rtattr
for ATM ARP entries and some way for the netlink code to give
neigh_add and friends more information than just address family with
which to find the correct ARP table.
[ I've changed the assertion checking in neigh_table_init() to not
use BUG_ON() while holding neigh_tbl_lock. Instead we remember that
we found an existing tbl with the same family, and after dropping
the lock we'll give a diagnostic kernel log message and a stack dump.
-DaveM ]
Signed-off-by: Simon Kelley <simon@thekelleys.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-05-12 23:56:08 +02:00
|
|
|
neigh_table_init_no_netlink(&clip_tbl);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
clip_tbl_hook = &clip_tbl;
|
|
|
|
register_atm_ioctl(&clip_ioctl_ops);
|
2006-04-15 00:07:27 +02:00
|
|
|
register_netdevice_notifier(&clip_dev_notifier);
|
|
|
|
register_inetaddr_notifier(&clip_inet_notifier);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2006-04-15 00:56:02 +02:00
|
|
|
setup_timer(&idle_timer, idle_timer_check, 0);
|
|
|
|
|
2006-07-09 21:13:18 +02:00
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
{
|
|
|
|
struct proc_dir_entry *p;
|
|
|
|
|
2008-02-28 22:55:45 +01:00
|
|
|
p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops);
|
2008-03-24 05:45:36 +01:00
|
|
|
if (!p) {
|
|
|
|
printk(KERN_ERR "Unable to initialize "
|
|
|
|
"/proc/net/atm/arp\n");
|
|
|
|
atm_clip_exit_noproc();
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
2006-07-09 21:13:18 +02:00
|
|
|
}
|
|
|
|
#endif
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-03-24 05:45:36 +01:00
|
|
|
static void atm_clip_exit_noproc(void)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
struct net_device *dev, *next;
|
|
|
|
|
2006-04-15 00:07:27 +02:00
|
|
|
unregister_inetaddr_notifier(&clip_inet_notifier);
|
|
|
|
unregister_netdevice_notifier(&clip_dev_notifier);
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
deregister_atm_ioctl(&clip_ioctl_ops);
|
|
|
|
|
|
|
|
/* First, stop the idle timer, so it stops banging
|
|
|
|
* on the table.
|
|
|
|
*/
|
2006-04-15 00:56:02 +02:00
|
|
|
del_timer_sync(&idle_timer);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
/* 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;
|
|
|
|
}
|
|
|
|
|
2008-03-24 05:45:36 +01:00
|
|
|
static void __exit atm_clip_exit(void)
|
|
|
|
{
|
|
|
|
remove_proc_entry("arp", atm_proc_root);
|
|
|
|
|
|
|
|
atm_clip_exit_noproc();
|
|
|
|
}
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
module_init(atm_clip_init);
|
|
|
|
module_exit(atm_clip_exit);
|
2006-04-15 01:01:26 +02:00
|
|
|
MODULE_AUTHOR("Werner Almesberger");
|
|
|
|
MODULE_DESCRIPTION("Classical/IP over ATM interface");
|
2005-04-17 00:20:36 +02:00
|
|
|
MODULE_LICENSE("GPL");
|