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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* net/atm/clip.c - RFC1577 Classical IP over ATM */
2
3/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
4
Joe Perches99824462010-01-26 11:40:00 +00005#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
6
Linus Torvalds1da177e2005-04-16 15:20:36 -07007#include <linux/string.h>
8#include <linux/errno.h>
9#include <linux/kernel.h> /* for UINT_MAX */
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/netdevice.h>
13#include <linux/skbuff.h>
14#include <linux/wait.h>
15#include <linux/timer.h>
16#include <linux/if_arp.h> /* for some manifest constants */
17#include <linux/notifier.h>
18#include <linux/atm.h>
19#include <linux/atmdev.h>
20#include <linux/atmclip.h>
21#include <linux/atmarp.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080022#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/ip.h> /* for net/route.h */
24#include <linux/in.h> /* for struct sockaddr_in */
25#include <linux/if.h> /* for IFF_UP */
26#include <linux/inetdevice.h>
27#include <linux/bitops.h>
Randy Dunlap4bdbf6c2006-07-03 19:47:27 -070028#include <linux/poison.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/proc_fs.h>
30#include <linux/seq_file.h>
31#include <linux/rcupdate.h>
32#include <linux/jhash.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090033#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <net/route.h> /* for struct rtable and routing */
35#include <net/icmp.h> /* icmp_send */
Joe Perchese956ea12010-01-26 11:40:05 +000036#include <linux/param.h> /* for HZ */
37#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <asm/byteorder.h> /* for htons etc. */
39#include <asm/system.h> /* save/restore_flags */
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <asm/atomic.h>
41
42#include "common.h"
43#include "resources.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <net/atmclip.h>
45
Linus Torvalds1da177e2005-04-16 15:20:36 -070046static struct net_device *clip_devs;
47static struct atm_vcc *atmarpd;
48static struct neigh_table clip_tbl;
49static struct timer_list idle_timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
Al Viro30d492d2006-11-14 21:11:29 -080051static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -070052{
53 struct sock *sk;
54 struct atmarp_ctrl *ctrl;
55 struct sk_buff *skb;
56
Joe Perches99824462010-01-26 11:40:00 +000057 pr_debug("(%d)\n", type);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -070058 if (!atmarpd)
59 return -EUNATCH;
Joe Perchese956ea12010-01-26 11:40:05 +000060 skb = alloc_skb(sizeof(struct atmarp_ctrl), GFP_ATOMIC);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -070061 if (!skb)
62 return -ENOMEM;
Joe Perchese956ea12010-01-26 11:40:05 +000063 ctrl = (struct atmarp_ctrl *)skb_put(skb, sizeof(struct atmarp_ctrl));
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 ctrl->type = type;
65 ctrl->itf_num = itf;
66 ctrl->ip = ip;
Stephen Hemmingere49e76d2006-04-14 15:59:37 -070067 atm_force_charge(atmarpd, skb->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
69 sk = sk_atm(atmarpd);
70 skb_queue_tail(&sk->sk_receive_queue, skb);
71 sk->sk_data_ready(sk, skb->len);
72 return 0;
73}
74
Stephen Hemmingere49e76d2006-04-14 15:59:37 -070075static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -070076{
Joe Perches99824462010-01-26 11:40:00 +000077 pr_debug("%p to entry %p (neigh %p)\n", clip_vcc, entry, entry->neigh);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 clip_vcc->entry = entry;
Stephen Hemmingere49e76d2006-04-14 15:59:37 -070079 clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 clip_vcc->next = entry->vccs;
81 entry->vccs = clip_vcc;
82 entry->neigh->used = jiffies;
83}
84
Linus Torvalds1da177e2005-04-16 15:20:36 -070085static void unlink_clip_vcc(struct clip_vcc *clip_vcc)
86{
87 struct atmarp_entry *entry = clip_vcc->entry;
88 struct clip_vcc **walk;
89
90 if (!entry) {
Joe Perches99824462010-01-26 11:40:00 +000091 pr_crit("!clip_vcc->entry (clip_vcc %p)\n", clip_vcc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 return;
93 }
Herbert Xu932ff272006-06-09 12:20:56 -070094 netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 entry->neigh->used = jiffies;
96 for (walk = &entry->vccs; *walk; walk = &(*walk)->next)
97 if (*walk == clip_vcc) {
98 int error;
99
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700100 *walk = clip_vcc->next; /* atomic */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 clip_vcc->entry = NULL;
102 if (clip_vcc->xoff)
103 netif_wake_queue(entry->neigh->dev);
104 if (entry->vccs)
105 goto out;
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700106 entry->expires = jiffies - 1;
107 /* force resolution or expiration */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 error = neigh_update(entry->neigh, NULL, NUD_NONE,
109 NEIGH_UPDATE_F_ADMIN);
110 if (error)
Joe Perches99824462010-01-26 11:40:00 +0000111 pr_crit("neigh_update failed with %d\n", error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 goto out;
113 }
Joe Perches99824462010-01-26 11:40:00 +0000114 pr_crit("ATMARP: failed (entry %p, vcc 0x%p)\n", entry, clip_vcc);
Joe Perchese956ea12010-01-26 11:40:05 +0000115out:
Herbert Xu932ff272006-06-09 12:20:56 -0700116 netif_tx_unlock_bh(entry->neigh->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117}
118
119/* The neighbour entry n->lock is held. */
120static int neigh_check_cb(struct neighbour *n)
121{
122 struct atmarp_entry *entry = NEIGH2ENTRY(n);
123 struct clip_vcc *cv;
124
125 for (cv = entry->vccs; cv; cv = cv->next) {
126 unsigned long exp = cv->last_use + cv->idle_timeout;
127
128 if (cv->idle_timeout && time_after(jiffies, exp)) {
Stephen Hemminger52240062007-08-28 15:22:09 -0700129 pr_debug("releasing vcc %p->%p of entry %p\n",
Joe Perches99824462010-01-26 11:40:00 +0000130 cv, cv->vcc, entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 vcc_release_async(cv->vcc, -ETIMEDOUT);
132 }
133 }
134
135 if (entry->vccs || time_before(jiffies, entry->expires))
136 return 0;
137
138 if (atomic_read(&n->refcnt) > 1) {
139 struct sk_buff *skb;
140
Stephen Hemminger52240062007-08-28 15:22:09 -0700141 pr_debug("destruction postponed with ref %d\n",
Joe Perches99824462010-01-26 11:40:00 +0000142 atomic_read(&n->refcnt));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700144 while ((skb = skb_dequeue(&n->arp_queue)) != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 dev_kfree_skb(skb);
146
147 return 0;
148 }
149
Stephen Hemminger52240062007-08-28 15:22:09 -0700150 pr_debug("expired neigh %p\n", n);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 return 1;
152}
153
154static void idle_timer_check(unsigned long dummy)
155{
156 write_lock(&clip_tbl.lock);
157 __neigh_for_each_release(&clip_tbl, neigh_check_cb);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700158 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 write_unlock(&clip_tbl.lock);
160}
161
162static int clip_arp_rcv(struct sk_buff *skb)
163{
164 struct atm_vcc *vcc;
165
Joe Perches99824462010-01-26 11:40:00 +0000166 pr_debug("\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 vcc = ATM_SKB(skb)->vcc;
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700168 if (!vcc || !atm_charge(vcc, skb->truesize)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 dev_kfree_skb_any(skb);
170 return 0;
171 }
Stephen Hemminger52240062007-08-28 15:22:09 -0700172 pr_debug("pushing to %p\n", vcc);
173 pr_debug("using %p\n", CLIP_VCC(vcc)->old_push);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700174 CLIP_VCC(vcc)->old_push(vcc, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 return 0;
176}
177
178static const unsigned char llc_oui[] = {
179 0xaa, /* DSAP: non-ISO */
180 0xaa, /* SSAP: non-ISO */
181 0x03, /* Ctrl: Unnumbered Information Command PDU */
182 0x00, /* OUI: EtherType */
183 0x00,
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700184 0x00
185};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700187static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188{
189 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
190
Joe Perches99824462010-01-26 11:40:00 +0000191 pr_debug("\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 if (!skb) {
Stephen Hemminger52240062007-08-28 15:22:09 -0700193 pr_debug("removing VCC %p\n", clip_vcc);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700194 if (clip_vcc->entry)
195 unlink_clip_vcc(clip_vcc);
196 clip_vcc->old_push(vcc, NULL); /* pass on the bad news */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 kfree(clip_vcc);
198 return;
199 }
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700200 atm_return(vcc, skb->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs;
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700202 /* clip_vcc->entry == NULL if we don't have an IP address yet */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 if (!skb->dev) {
204 dev_kfree_skb_any(skb);
205 return;
206 }
207 ATM_SKB(skb)->vcc = vcc;
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -0700208 skb_reset_mac_header(skb);
Joe Perchese956ea12010-01-26 11:40:05 +0000209 if (!clip_vcc->encap ||
210 skb->len < RFC1483LLC_LEN ||
211 memcmp(skb->data, llc_oui, sizeof(llc_oui)))
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700212 skb->protocol = htons(ETH_P_IP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 else {
Joe Perchese956ea12010-01-26 11:40:05 +0000214 skb->protocol = ((__be16 *)skb->data)[3];
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700215 skb_pull(skb, RFC1483LLC_LEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 if (skb->protocol == htons(ETH_P_ARP)) {
Stephen Hemminger1a6afe82009-01-09 13:01:00 +0000217 skb->dev->stats.rx_packets++;
218 skb->dev->stats.rx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 clip_arp_rcv(skb);
220 return;
221 }
222 }
223 clip_vcc->last_use = jiffies;
Stephen Hemminger1a6afe82009-01-09 13:01:00 +0000224 skb->dev->stats.rx_packets++;
225 skb->dev->stats.rx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
227 netif_rx(skb);
228}
229
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230/*
231 * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that
232 * clip_pop is atomic with respect to the critical section in clip_start_xmit.
233 */
234
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700235static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236{
237 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
238 struct net_device *dev = skb->dev;
239 int old;
240 unsigned long flags;
241
Joe Perches99824462010-01-26 11:40:00 +0000242 pr_debug("(vcc %p)\n", vcc);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700243 clip_vcc->old_pop(vcc, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 /* skb->dev == NULL in outbound ARP packets */
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700245 if (!dev)
246 return;
247 spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags);
248 if (atm_may_send(vcc, 0)) {
249 old = xchg(&clip_vcc->xoff, 0);
250 if (old)
251 netif_wake_queue(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 }
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700253 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254}
255
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700256static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257{
Joe Perches99824462010-01-26 11:40:00 +0000258 pr_debug("(neigh %p, skb %p)\n", neigh, skb);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700259 to_atmarpd(act_need, PRIV(neigh->dev)->number, NEIGH2ENTRY(neigh)->ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260}
261
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700262static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263{
264#ifndef CONFIG_ATM_CLIP_NO_ICMP
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700265 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266#endif
267 kfree_skb(skb);
268}
269
Stephen Hemminger89d69d22009-09-01 11:13:19 +0000270static const struct neigh_ops clip_neigh_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 .family = AF_INET,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 .solicit = clip_neigh_solicit,
273 .error_report = clip_neigh_error,
274 .output = dev_queue_xmit,
275 .connected_output = dev_queue_xmit,
276 .hh_output = dev_queue_xmit,
277 .queue_xmit = dev_queue_xmit,
278};
279
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280static int clip_constructor(struct neighbour *neigh)
281{
282 struct atmarp_entry *entry = NEIGH2ENTRY(neigh);
283 struct net_device *dev = neigh->dev;
284 struct in_device *in_dev;
285 struct neigh_parms *parms;
286
Joe Perches99824462010-01-26 11:40:00 +0000287 pr_debug("(neigh %p, entry %p)\n", neigh, entry);
Eric W. Biederman6b175b22008-01-10 03:25:28 -0800288 neigh->type = inet_addr_type(&init_net, entry->ip);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700289 if (neigh->type != RTN_UNICAST)
290 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
292 rcu_read_lock();
Herbert Xue5ed6392005-10-03 14:35:55 -0700293 in_dev = __in_dev_get_rcu(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 if (!in_dev) {
295 rcu_read_unlock();
296 return -EINVAL;
297 }
298
299 parms = in_dev->arp_parms;
300 __neigh_parms_put(neigh->parms);
301 neigh->parms = neigh_parms_clone(parms);
302 rcu_read_unlock();
303
304 neigh->ops = &clip_neigh_ops;
305 neigh->output = neigh->nud_state & NUD_VALID ?
306 neigh->ops->connected_output : neigh->ops->output;
307 entry->neigh = neigh;
308 entry->vccs = NULL;
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700309 entry->expires = jiffies - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 return 0;
311}
312
313static u32 clip_hash(const void *pkey, const struct net_device *dev)
314{
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700315 return jhash_2words(*(u32 *) pkey, dev->ifindex, clip_tbl.hash_rnd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316}
317
318static struct neigh_table clip_tbl = {
319 .family = AF_INET,
320 .entry_size = sizeof(struct neighbour)+sizeof(struct atmarp_entry),
321 .key_len = 4,
322 .hash = clip_hash,
323 .constructor = clip_constructor,
324 .id = "clip_arp_cache",
325
326 /* parameters are copied from ARP ... */
327 .parms = {
328 .tbl = &clip_tbl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 .base_reachable_time = 30 * HZ,
330 .retrans_time = 1 * HZ,
331 .gc_staletime = 60 * HZ,
332 .reachable_time = 30 * HZ,
333 .delay_probe_time = 5 * HZ,
334 .queue_len = 3,
335 .ucast_probes = 3,
336 .mcast_probes = 3,
337 .anycast_delay = 1 * HZ,
338 .proxy_delay = (8 * HZ) / 10,
339 .proxy_qlen = 64,
340 .locktime = 1 * HZ,
341 },
342 .gc_interval = 30 * HZ,
343 .gc_thresh1 = 128,
344 .gc_thresh2 = 512,
345 .gc_thresh3 = 1024,
346};
347
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348/* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
349
350/*
351 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means
352 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also,
353 * don't increment the usage count. This is used to create entries in
354 * clip_setentry.
355 */
356
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700357static int clip_encap(struct atm_vcc *vcc, int mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358{
359 CLIP_VCC(vcc)->encap = mode;
360 return 0;
361}
362
Stephen Hemminger3c805a22009-08-31 19:50:42 +0000363static netdev_tx_t clip_start_xmit(struct sk_buff *skb,
364 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365{
366 struct clip_priv *clip_priv = PRIV(dev);
367 struct atmarp_entry *entry;
368 struct atm_vcc *vcc;
369 int old;
370 unsigned long flags;
371
Joe Perches99824462010-01-26 11:40:00 +0000372 pr_debug("(skb %p)\n", skb);
Eric Dumazetadf30902009-06-02 05:19:30 +0000373 if (!skb_dst(skb)) {
Joe Perches99824462010-01-26 11:40:00 +0000374 pr_err("skb_dst(skb) == NULL\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 dev_kfree_skb(skb);
Stephen Hemminger1a6afe82009-01-09 13:01:00 +0000376 dev->stats.tx_dropped++;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000377 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 }
Eric Dumazetadf30902009-06-02 05:19:30 +0000379 if (!skb_dst(skb)->neighbour) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380#if 0
Eric Dumazetadf30902009-06-02 05:19:30 +0000381 skb_dst(skb)->neighbour = clip_find_neighbour(skb_dst(skb), 1);
382 if (!skb_dst(skb)->neighbour) {
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700383 dev_kfree_skb(skb); /* lost that one */
Stephen Hemminger1a6afe82009-01-09 13:01:00 +0000384 dev->stats.tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 return 0;
386 }
387#endif
Joe Perches99824462010-01-26 11:40:00 +0000388 pr_err("NO NEIGHBOUR !\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 dev_kfree_skb(skb);
Stephen Hemminger1a6afe82009-01-09 13:01:00 +0000390 dev->stats.tx_dropped++;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000391 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 }
Eric Dumazetadf30902009-06-02 05:19:30 +0000393 entry = NEIGH2ENTRY(skb_dst(skb)->neighbour);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 if (!entry->vccs) {
395 if (time_after(jiffies, entry->expires)) {
396 /* should be resolved */
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700397 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ;
398 to_atmarpd(act_need, PRIV(dev)->number, entry->ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 }
400 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700401 skb_queue_tail(&entry->neigh->arp_queue, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 else {
403 dev_kfree_skb(skb);
Stephen Hemminger1a6afe82009-01-09 13:01:00 +0000404 dev->stats.tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 }
Patrick McHardy6ed10652009-06-23 06:03:08 +0000406 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 }
Stephen Hemminger52240062007-08-28 15:22:09 -0700408 pr_debug("neigh %p, vccs %p\n", entry, entry->vccs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
Eric Dumazetadf30902009-06-02 05:19:30 +0000410 pr_debug("using neighbour %p, vcc %p\n", skb_dst(skb)->neighbour, vcc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 if (entry->vccs->encap) {
412 void *here;
413
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700414 here = skb_push(skb, RFC1483LLC_LEN);
415 memcpy(here, llc_oui, sizeof(llc_oui));
Al Viro30d492d2006-11-14 21:11:29 -0800416 ((__be16 *) here)[3] = skb->protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 }
418 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
419 ATM_SKB(skb)->atm_options = vcc->atm_options;
420 entry->vccs->last_use = jiffies;
Stephen Hemminger52240062007-08-28 15:22:09 -0700421 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700422 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 if (old) {
Joe Perches99824462010-01-26 11:40:00 +0000424 pr_warning("XOFF->XOFF transition\n");
Patrick McHardy6ed10652009-06-23 06:03:08 +0000425 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 }
Stephen Hemminger1a6afe82009-01-09 13:01:00 +0000427 dev->stats.tx_packets++;
428 dev->stats.tx_bytes += skb->len;
Stephen Hemminger5ff765f2006-04-14 16:00:59 -0700429 vcc->send(vcc, skb);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700430 if (atm_may_send(vcc, 0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 entry->vccs->xoff = 0;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000432 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 }
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700434 spin_lock_irqsave(&clip_priv->xoff_lock, flags);
435 netif_stop_queue(dev); /* XOFF -> throttle immediately */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 barrier();
437 if (!entry->vccs->xoff)
438 netif_start_queue(dev);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700439 /* Oh, we just raced with clip_pop. netif_start_queue should be
440 good enough, because nothing should really be asleep because
441 of the brief netif_stop_queue. If this isn't true or if it
442 changes, use netif_wake_queue instead. */
443 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000444 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445}
446
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700447static int clip_mkip(struct atm_vcc *vcc, int timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448{
David S. Millerb6211ae2009-05-28 16:36:47 -0700449 struct sk_buff_head *rq, queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 struct clip_vcc *clip_vcc;
David S. Millerb6211ae2009-05-28 16:36:47 -0700451 struct sk_buff *skb, *tmp;
David S. Millerc40a27f2006-11-30 21:05:23 -0800452 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700454 if (!vcc->push)
455 return -EBADFD;
456 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL);
457 if (!clip_vcc)
458 return -ENOMEM;
Joe Perches99824462010-01-26 11:40:00 +0000459 pr_debug("%p vcc %p\n", clip_vcc, vcc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 clip_vcc->vcc = vcc;
461 vcc->user_back = clip_vcc;
462 set_bit(ATM_VF_IS_CLIP, &vcc->flags);
463 clip_vcc->entry = NULL;
464 clip_vcc->xoff = 0;
465 clip_vcc->encap = 1;
466 clip_vcc->last_use = jiffies;
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700467 clip_vcc->idle_timeout = timeout * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 clip_vcc->old_push = vcc->push;
469 clip_vcc->old_pop = vcc->pop;
470 vcc->push = clip_push;
471 vcc->pop = clip_pop;
David S. Millerc40a27f2006-11-30 21:05:23 -0800472
David S. Millerb6211ae2009-05-28 16:36:47 -0700473 __skb_queue_head_init(&queue);
David S. Millerc40a27f2006-11-30 21:05:23 -0800474 rq = &sk_atm(vcc)->sk_receive_queue;
475
476 spin_lock_irqsave(&rq->lock, flags);
David S. Millerb6211ae2009-05-28 16:36:47 -0700477 skb_queue_splice_init(rq, &queue);
David S. Millerc40a27f2006-11-30 21:05:23 -0800478 spin_unlock_irqrestore(&rq->lock, flags);
479
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 /* re-process everything received between connection setup and MKIP */
David S. Millerb6211ae2009-05-28 16:36:47 -0700481 skb_queue_walk_safe(&queue, skb, tmp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 if (!clip_devs) {
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700483 atm_return(vcc, skb->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 kfree_skb(skb);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700485 } else {
David S. Millerb6211ae2009-05-28 16:36:47 -0700486 struct net_device *dev = skb->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 unsigned int len = skb->len;
488
YOSHIFUJI Hideakife261092006-09-18 06:37:58 -0700489 skb_get(skb);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700490 clip_push(vcc, skb);
David S. Millerb6211ae2009-05-28 16:36:47 -0700491 dev->stats.rx_packets--;
492 dev->stats.rx_bytes -= len;
YOSHIFUJI Hideakife261092006-09-18 06:37:58 -0700493 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 }
David S. Millerc40a27f2006-11-30 21:05:23 -0800495 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 return 0;
497}
498
Al Viro30d492d2006-11-14 21:11:29 -0800499static int clip_setentry(struct atm_vcc *vcc, __be32 ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500{
501 struct neighbour *neigh;
502 struct atmarp_entry *entry;
503 int error;
504 struct clip_vcc *clip_vcc;
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700505 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1}} };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 struct rtable *rt;
507
508 if (vcc->push != clip_push) {
Joe Perches99824462010-01-26 11:40:00 +0000509 pr_warning("non-CLIP VCC\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 return -EBADF;
511 }
512 clip_vcc = CLIP_VCC(vcc);
513 if (!ip) {
514 if (!clip_vcc->entry) {
Joe Perches99824462010-01-26 11:40:00 +0000515 pr_err("hiding hidden ATMARP entry\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 return 0;
517 }
Joe Perches99824462010-01-26 11:40:00 +0000518 pr_debug("remove\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 unlink_clip_vcc(clip_vcc);
520 return 0;
521 }
Denis V. Lunevf2063512008-01-22 22:07:34 -0800522 error = ip_route_output_key(&init_net, &rt, &fl);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700523 if (error)
524 return error;
525 neigh = __neigh_lookup(&clip_tbl, &ip, rt->u.dst.dev, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 ip_rt_put(rt);
527 if (!neigh)
528 return -ENOMEM;
529 entry = NEIGH2ENTRY(neigh);
530 if (entry != clip_vcc->entry) {
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700531 if (!clip_vcc->entry)
Joe Perches99824462010-01-26 11:40:00 +0000532 pr_debug("add\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 else {
Joe Perches99824462010-01-26 11:40:00 +0000534 pr_debug("update\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 unlink_clip_vcc(clip_vcc);
536 }
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700537 link_vcc(clip_vcc, entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 }
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700539 error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
540 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 neigh_release(neigh);
542 return error;
543}
544
Stephen Hemmingerdde09752009-03-20 19:35:29 +0000545static const struct net_device_ops clip_netdev_ops = {
546 .ndo_start_xmit = clip_start_xmit,
547};
548
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549static void clip_setup(struct net_device *dev)
550{
Stephen Hemmingerdde09752009-03-20 19:35:29 +0000551 dev->netdev_ops = &clip_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 dev->type = ARPHRD_ATM;
553 dev->hard_header_len = RFC1483LLC_LEN;
554 dev->mtu = RFC1626_MTU;
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700555 dev->tx_queue_len = 100; /* "normal" queue (packets) */
556 /* When using a "real" qdisc, the qdisc determines the queue */
557 /* length. tx_queue_len is only used for the default case, */
558 /* without any more elaborate queuing. 100 is a reasonable */
559 /* compromise between decent burst-tolerance and protection */
560 /* against memory hogs. */
Eric Dumazeta489e512009-05-28 11:14:49 +0000561 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562}
563
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564static int clip_create(int number)
565{
566 struct net_device *dev;
567 struct clip_priv *clip_priv;
568 int error;
569
570 if (number != -1) {
571 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700572 if (PRIV(dev)->number == number)
573 return -EEXIST;
574 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 number = 0;
576 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
577 if (PRIV(dev)->number >= number)
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700578 number = PRIV(dev)->number + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 }
580 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup);
581 if (!dev)
582 return -ENOMEM;
583 clip_priv = PRIV(dev);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700584 sprintf(dev->name, "atm%d", number);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 spin_lock_init(&clip_priv->xoff_lock);
586 clip_priv->number = number;
587 error = register_netdev(dev);
588 if (error) {
589 free_netdev(dev);
590 return error;
591 }
592 clip_priv->next = clip_devs;
593 clip_devs = dev;
Stephen Hemminger52240062007-08-28 15:22:09 -0700594 pr_debug("registered (net:%s)\n", dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 return number;
596}
597
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700598static int clip_device_event(struct notifier_block *this, unsigned long event,
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700599 void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600{
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700601 struct net_device *dev = arg;
602
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700603 if (!net_eq(dev_net(dev), &init_net))
Eric W. Biedermane9dc8652007-09-12 13:02:17 +0200604 return NOTIFY_DONE;
605
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700606 if (event == NETDEV_UNREGISTER) {
607 neigh_ifdown(&clip_tbl, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 return NOTIFY_DONE;
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700609 }
610
611 /* ignore non-CLIP devices */
Stephen Hemmingerdde09752009-03-20 19:35:29 +0000612 if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops)
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700613 return NOTIFY_DONE;
614
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 switch (event) {
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700616 case NETDEV_UP:
Joe Perches99824462010-01-26 11:40:00 +0000617 pr_debug("NETDEV_UP\n");
Stephen Hemminger5ff765f2006-04-14 16:00:59 -0700618 to_atmarpd(act_up, PRIV(dev)->number, 0);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700619 break;
620 case NETDEV_GOING_DOWN:
Joe Perches99824462010-01-26 11:40:00 +0000621 pr_debug("NETDEV_DOWN\n");
Stephen Hemminger5ff765f2006-04-14 16:00:59 -0700622 to_atmarpd(act_down, PRIV(dev)->number, 0);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700623 break;
624 case NETDEV_CHANGE:
625 case NETDEV_CHANGEMTU:
Joe Perches99824462010-01-26 11:40:00 +0000626 pr_debug("NETDEV_CHANGE*\n");
Stephen Hemminger5ff765f2006-04-14 16:00:59 -0700627 to_atmarpd(act_change, PRIV(dev)->number, 0);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700628 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 }
630 return NOTIFY_DONE;
631}
632
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700633static int clip_inet_event(struct notifier_block *this, unsigned long event,
634 void *ifa)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635{
636 struct in_device *in_dev;
637
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700638 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 /*
640 * Transitions are of the down-change-up type, so it's sufficient to
641 * handle the change on up.
642 */
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700643 if (event != NETDEV_UP)
644 return NOTIFY_DONE;
645 return clip_device_event(this, NETDEV_CHANGE, in_dev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646}
647
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648static struct notifier_block clip_dev_notifier = {
Stephen Hemminger5ff765f2006-04-14 16:00:59 -0700649 .notifier_call = clip_device_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650};
651
652
653
654static struct notifier_block clip_inet_notifier = {
Stephen Hemminger5ff765f2006-04-14 16:00:59 -0700655 .notifier_call = clip_inet_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656};
657
658
659
660static void atmarpd_close(struct atm_vcc *vcc)
661{
Joe Perches99824462010-01-26 11:40:00 +0000662 pr_debug("\n");
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700663
664 rtnl_lock();
665 atmarpd = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700667 rtnl_unlock();
668
Stephen Hemminger52240062007-08-28 15:22:09 -0700669 pr_debug("(done)\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 module_put(THIS_MODULE);
671}
672
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673static struct atmdev_ops atmarpd_dev_ops = {
674 .close = atmarpd_close
675};
676
677
678static struct atm_dev atmarpd_dev = {
679 .ops = &atmarpd_dev_ops,
680 .type = "arpd",
681 .number = 999,
Milind Arun Choudhary4ef8d0a2007-04-26 01:37:44 -0700682 .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683};
684
685
686static int atm_init_atmarp(struct atm_vcc *vcc)
687{
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700688 rtnl_lock();
689 if (atmarpd) {
690 rtnl_unlock();
691 return -EADDRINUSE;
692 }
693
Joe Perchese956ea12010-01-26 11:40:05 +0000694 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
Stephen Hemminger2d907392006-04-14 15:56:02 -0700695
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 atmarpd = vcc;
Joe Perchese956ea12010-01-26 11:40:05 +0000697 set_bit(ATM_VF_META, &vcc->flags);
698 set_bit(ATM_VF_READY, &vcc->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 /* allow replies and avoid getting closed if signaling dies */
700 vcc->dev = &atmarpd_dev;
701 vcc_insert_socket(sk_atm(vcc));
702 vcc->push = NULL;
703 vcc->pop = NULL; /* crash */
704 vcc->push_oam = NULL; /* crash */
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700705 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 return 0;
707}
708
709static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
710{
711 struct atm_vcc *vcc = ATM_SD(sock);
712 int err = 0;
713
714 switch (cmd) {
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700715 case SIOCMKCLIP:
716 case ATMARPD_CTRL:
717 case ATMARP_MKIP:
718 case ATMARP_SETENTRY:
719 case ATMARP_ENCAP:
720 if (!capable(CAP_NET_ADMIN))
721 return -EPERM;
722 break;
723 default:
724 return -ENOIOCTLCMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 }
726
727 switch (cmd) {
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700728 case SIOCMKCLIP:
729 err = clip_create(arg);
730 break;
731 case ATMARPD_CTRL:
732 err = atm_init_atmarp(vcc);
733 if (!err) {
734 sock->state = SS_CONNECTED;
735 __module_get(THIS_MODULE);
736 }
737 break;
738 case ATMARP_MKIP:
739 err = clip_mkip(vcc, arg);
740 break;
741 case ATMARP_SETENTRY:
Al Viro30d492d2006-11-14 21:11:29 -0800742 err = clip_setentry(vcc, (__force __be32)arg);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700743 break;
744 case ATMARP_ENCAP:
745 err = clip_encap(vcc, arg);
746 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 }
748 return err;
749}
750
751static struct atm_ioctl clip_ioctl_ops = {
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700752 .owner = THIS_MODULE,
753 .ioctl = clip_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754};
755
756#ifdef CONFIG_PROC_FS
757
758static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
759{
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700760 static int code[] = { 1, 2, 10, 6, 1, 0 };
761 static int e164[] = { 1, 8, 4, 6, 1, 0 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762
763 if (*addr->sas_addr.pub) {
764 seq_printf(seq, "%s", addr->sas_addr.pub);
765 if (*addr->sas_addr.prv)
766 seq_putc(seq, '+');
767 } else if (!*addr->sas_addr.prv) {
768 seq_printf(seq, "%s", "(none)");
769 return;
770 }
771 if (*addr->sas_addr.prv) {
772 unsigned char *prv = addr->sas_addr.prv;
773 int *fields;
774 int i, j;
775
776 fields = *prv == ATM_AFI_E164 ? e164 : code;
777 for (i = 0; fields[i]; i++) {
778 for (j = fields[i]; j; j--)
779 seq_printf(seq, "%02X", *prv++);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700780 if (fields[i + 1])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 seq_putc(seq, '.');
782 }
783 }
784}
785
786/* This means the neighbour entry has no attached VCC objects. */
787#define SEQ_NO_VCC_TOKEN ((void *) 2)
788
789static void atmarp_info(struct seq_file *seq, struct net_device *dev,
790 struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
791{
792 unsigned long exp;
793 char buf[17];
794 int svc, llc, off;
795
796 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
797 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC));
798
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700799 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
801 if (clip_vcc == SEQ_NO_VCC_TOKEN)
802 exp = entry->neigh->used;
803 else
804 exp = clip_vcc->last_use;
805
806 exp = (jiffies - exp) / HZ;
807
808 seq_printf(seq, "%-6s%-4s%-4s%5ld ",
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700809 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810
Harvey Harrison21454aa2008-10-31 00:54:56 -0700811 off = scnprintf(buf, sizeof(buf) - 1, "%pI4",
812 &entry->ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 while (off < 16)
814 buf[off++] = ' ';
815 buf[off] = '\0';
816 seq_printf(seq, "%s", buf);
817
818 if (clip_vcc == SEQ_NO_VCC_TOKEN) {
819 if (time_before(jiffies, entry->expires))
820 seq_printf(seq, "(resolving)\n");
821 else
822 seq_printf(seq, "(expired, ref %d)\n",
823 atomic_read(&entry->neigh->refcnt));
824 } else if (!svc) {
825 seq_printf(seq, "%d.%d.%d\n",
826 clip_vcc->vcc->dev->number,
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700827 clip_vcc->vcc->vpi, clip_vcc->vcc->vci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 } else {
829 svc_addr(seq, &clip_vcc->vcc->remote);
830 seq_putc(seq, '\n');
831 }
832}
833
834struct clip_seq_state {
835 /* This member must be first. */
836 struct neigh_seq_state ns;
837
838 /* Local to clip specific iteration. */
839 struct clip_vcc *vcc;
840};
841
842static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e,
843 struct clip_vcc *curr)
844{
845 if (!curr) {
846 curr = e->vccs;
847 if (!curr)
848 return SEQ_NO_VCC_TOKEN;
849 return curr;
850 }
851 if (curr == SEQ_NO_VCC_TOKEN)
852 return NULL;
853
854 curr = curr->next;
855
856 return curr;
857}
858
859static void *clip_seq_vcc_walk(struct clip_seq_state *state,
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700860 struct atmarp_entry *e, loff_t * pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861{
862 struct clip_vcc *vcc = state->vcc;
863
864 vcc = clip_seq_next_vcc(e, vcc);
865 if (vcc && pos != NULL) {
866 while (*pos) {
867 vcc = clip_seq_next_vcc(e, vcc);
868 if (!vcc)
869 break;
870 --(*pos);
871 }
872 }
873 state->vcc = vcc;
874
875 return vcc;
876}
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700877
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700879 struct neighbour *n, loff_t * pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880{
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700881 struct clip_seq_state *state = (struct clip_seq_state *)_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882
883 return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos);
884}
885
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700886static void *clip_seq_start(struct seq_file *seq, loff_t * pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887{
Denis V. Lunevae221202008-01-10 03:52:35 -0800888 struct clip_seq_state *state = seq->private;
889 state->ns.neigh_sub_iter = clip_seq_sub_iter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY);
891}
892
893static int clip_seq_show(struct seq_file *seq, void *v)
894{
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700895 static char atm_arp_banner[] =
896 "IPitf TypeEncp Idle IP address ATM address\n";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897
898 if (v == SEQ_START_TOKEN) {
899 seq_puts(seq, atm_arp_banner);
900 } else {
901 struct clip_seq_state *state = seq->private;
902 struct neighbour *n = v;
903 struct clip_vcc *vcc = state->vcc;
904
905 atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc);
906 }
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700907 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908}
909
Philippe De Muyter56b3d972007-07-10 23:07:31 -0700910static const struct seq_operations arp_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 .start = clip_seq_start,
912 .next = neigh_seq_next,
913 .stop = neigh_seq_stop,
914 .show = clip_seq_show,
915};
916
917static int arp_seq_open(struct inode *inode, struct file *file)
918{
Denis V. Lunevae221202008-01-10 03:52:35 -0800919 return seq_open_net(inode, file, &arp_seq_ops,
920 sizeof(struct clip_seq_state));
Eric W. Biederman426b5302008-01-24 00:13:18 -0800921}
922
Arjan van de Ven9a321442007-02-12 00:55:35 -0800923static const struct file_operations arp_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 .open = arp_seq_open,
925 .read = seq_read,
926 .llseek = seq_lseek,
Denis V. Lunevae221202008-01-10 03:52:35 -0800927 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 .owner = THIS_MODULE
929};
930#endif
931
Wang Chendbee0d32008-03-23 21:45:36 -0700932static void atm_clip_exit_noproc(void);
933
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934static int __init atm_clip_init(void)
935{
Simon Kelleybd89efc2006-05-12 14:56:08 -0700936 neigh_table_init_no_netlink(&clip_tbl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937
938 clip_tbl_hook = &clip_tbl;
939 register_atm_ioctl(&clip_ioctl_ops);
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700940 register_netdevice_notifier(&clip_dev_notifier);
941 register_inetaddr_notifier(&clip_inet_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942
Stephen Hemminger2d907392006-04-14 15:56:02 -0700943 setup_timer(&idle_timer, idle_timer_check, 0);
944
Adrian Bunk24781732006-07-09 12:13:18 -0700945#ifdef CONFIG_PROC_FS
946 {
947 struct proc_dir_entry *p;
948
Wang Chen16e297b2008-02-28 13:55:45 -0800949 p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops);
Wang Chendbee0d32008-03-23 21:45:36 -0700950 if (!p) {
Joe Perches99824462010-01-26 11:40:00 +0000951 pr_err("Unable to initialize /proc/net/atm/arp\n");
Wang Chendbee0d32008-03-23 21:45:36 -0700952 atm_clip_exit_noproc();
953 return -ENOMEM;
954 }
Adrian Bunk24781732006-07-09 12:13:18 -0700955 }
956#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957
958 return 0;
959}
960
Wang Chendbee0d32008-03-23 21:45:36 -0700961static void atm_clip_exit_noproc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962{
963 struct net_device *dev, *next;
964
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700965 unregister_inetaddr_notifier(&clip_inet_notifier);
966 unregister_netdevice_notifier(&clip_dev_notifier);
967
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 deregister_atm_ioctl(&clip_ioctl_ops);
969
970 /* First, stop the idle timer, so it stops banging
971 * on the table.
972 */
Stephen Hemminger2d907392006-04-14 15:56:02 -0700973 del_timer_sync(&idle_timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974
975 /* Next, purge the table, so that the device
976 * unregister loop below does not hang due to
977 * device references remaining in the table.
978 */
979 neigh_ifdown(&clip_tbl, NULL);
980
981 dev = clip_devs;
982 while (dev) {
983 next = PRIV(dev)->next;
984 unregister_netdev(dev);
985 free_netdev(dev);
986 dev = next;
987 }
988
989 /* Now it is safe to fully shutdown whole table. */
990 neigh_table_clear(&clip_tbl);
991
992 clip_tbl_hook = NULL;
993}
994
Wang Chendbee0d32008-03-23 21:45:36 -0700995static void __exit atm_clip_exit(void)
996{
997 remove_proc_entry("arp", atm_proc_root);
998
999 atm_clip_exit_noproc();
1000}
1001
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002module_init(atm_clip_init);
1003module_exit(atm_clip_exit);
Stephen Hemminger4909e4882006-04-14 16:01:26 -07001004MODULE_AUTHOR("Werner Almesberger");
1005MODULE_DESCRIPTION("Classical/IP over ATM interface");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006MODULE_LICENSE("GPL");