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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 */
David Miller32092ec2011-07-25 00:01:41 +000036#include <net/arp.h>
Joe Perchese956ea12010-01-26 11:40:05 +000037#include <linux/param.h> /* for HZ */
38#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <asm/byteorder.h> /* for htons etc. */
Arun Sharma600634972011-07-26 16:09:06 -070040#include <linux/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048static struct timer_list idle_timer;
Eric Dumazet597cdbc2012-02-21 10:46:49 +000049static const struct neigh_ops clip_neigh_ops;
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);
David S. Miller676d2362014-04-11 16:15:36 -040071 sk->sk_data_ready(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 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{
David Miller869759b2011-07-25 00:01:33 +0000122 struct atmarp_entry *entry = neighbour_priv(n);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 struct clip_vcc *cv;
124
Eric Dumazet597cdbc2012-02-21 10:46:49 +0000125 if (n->ops != &clip_neigh_ops)
126 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 for (cv = entry->vccs; cv; cv = cv->next) {
128 unsigned long exp = cv->last_use + cv->idle_timeout;
129
130 if (cv->idle_timeout && time_after(jiffies, exp)) {
Stephen Hemminger52240062007-08-28 15:22:09 -0700131 pr_debug("releasing vcc %p->%p of entry %p\n",
Joe Perches99824462010-01-26 11:40:00 +0000132 cv, cv->vcc, entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 vcc_release_async(cv->vcc, -ETIMEDOUT);
134 }
135 }
136
137 if (entry->vccs || time_before(jiffies, entry->expires))
138 return 0;
139
140 if (atomic_read(&n->refcnt) > 1) {
141 struct sk_buff *skb;
142
Stephen Hemminger52240062007-08-28 15:22:09 -0700143 pr_debug("destruction postponed with ref %d\n",
Joe Perches99824462010-01-26 11:40:00 +0000144 atomic_read(&n->refcnt));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700146 while ((skb = skb_dequeue(&n->arp_queue)) != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 dev_kfree_skb(skb);
148
149 return 0;
150 }
151
Stephen Hemminger52240062007-08-28 15:22:09 -0700152 pr_debug("expired neigh %p\n", n);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 return 1;
154}
155
156static void idle_timer_check(unsigned long dummy)
157{
Eric Dumazet597cdbc2012-02-21 10:46:49 +0000158 write_lock(&arp_tbl.lock);
159 __neigh_for_each_release(&arp_tbl, neigh_check_cb);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700160 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
Eric Dumazet597cdbc2012-02-21 10:46:49 +0000161 write_unlock(&arp_tbl.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162}
163
164static int clip_arp_rcv(struct sk_buff *skb)
165{
166 struct atm_vcc *vcc;
167
Joe Perches99824462010-01-26 11:40:00 +0000168 pr_debug("\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 vcc = ATM_SKB(skb)->vcc;
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700170 if (!vcc || !atm_charge(vcc, skb->truesize)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 dev_kfree_skb_any(skb);
172 return 0;
173 }
Stephen Hemminger52240062007-08-28 15:22:09 -0700174 pr_debug("pushing to %p\n", vcc);
175 pr_debug("using %p\n", CLIP_VCC(vcc)->old_push);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700176 CLIP_VCC(vcc)->old_push(vcc, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 return 0;
178}
179
180static const unsigned char llc_oui[] = {
181 0xaa, /* DSAP: non-ISO */
182 0xaa, /* SSAP: non-ISO */
183 0x03, /* Ctrl: Unnumbered Information Command PDU */
184 0x00, /* OUI: EtherType */
185 0x00,
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700186 0x00
187};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700189static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190{
191 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
192
Joe Perches99824462010-01-26 11:40:00 +0000193 pr_debug("\n");
Jorge Boncompte [DTI2]3b829362011-11-21 10:25:56 +0000194
195 if (!clip_devs) {
196 atm_return(vcc, skb->truesize);
197 kfree_skb(skb);
198 return;
199 }
200
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 if (!skb) {
Stephen Hemminger52240062007-08-28 15:22:09 -0700202 pr_debug("removing VCC %p\n", clip_vcc);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700203 if (clip_vcc->entry)
204 unlink_clip_vcc(clip_vcc);
205 clip_vcc->old_push(vcc, NULL); /* pass on the bad news */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 kfree(clip_vcc);
207 return;
208 }
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700209 atm_return(vcc, skb->truesize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs;
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700211 /* clip_vcc->entry == NULL if we don't have an IP address yet */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 if (!skb->dev) {
213 dev_kfree_skb_any(skb);
214 return;
215 }
216 ATM_SKB(skb)->vcc = vcc;
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -0700217 skb_reset_mac_header(skb);
Joe Perchese956ea12010-01-26 11:40:05 +0000218 if (!clip_vcc->encap ||
219 skb->len < RFC1483LLC_LEN ||
220 memcmp(skb->data, llc_oui, sizeof(llc_oui)))
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700221 skb->protocol = htons(ETH_P_IP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 else {
Joe Perchese956ea12010-01-26 11:40:05 +0000223 skb->protocol = ((__be16 *)skb->data)[3];
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700224 skb_pull(skb, RFC1483LLC_LEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 if (skb->protocol == htons(ETH_P_ARP)) {
Stephen Hemminger1a6afe82009-01-09 13:01:00 +0000226 skb->dev->stats.rx_packets++;
227 skb->dev->stats.rx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 clip_arp_rcv(skb);
229 return;
230 }
231 }
232 clip_vcc->last_use = jiffies;
Stephen Hemminger1a6afe82009-01-09 13:01:00 +0000233 skb->dev->stats.rx_packets++;
234 skb->dev->stats.rx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
236 netif_rx(skb);
237}
238
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239/*
240 * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that
241 * clip_pop is atomic with respect to the critical section in clip_start_xmit.
242 */
243
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700244static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245{
246 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
247 struct net_device *dev = skb->dev;
248 int old;
249 unsigned long flags;
250
Joe Perches99824462010-01-26 11:40:00 +0000251 pr_debug("(vcc %p)\n", vcc);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700252 clip_vcc->old_pop(vcc, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 /* skb->dev == NULL in outbound ARP packets */
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700254 if (!dev)
255 return;
256 spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags);
257 if (atm_may_send(vcc, 0)) {
258 old = xchg(&clip_vcc->xoff, 0);
259 if (old)
260 netif_wake_queue(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 }
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700262 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263}
264
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700265static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266{
David Miller869759b2011-07-25 00:01:33 +0000267 __be32 *ip = (__be32 *) neigh->primary_key;
268
Joe Perches99824462010-01-26 11:40:00 +0000269 pr_debug("(neigh %p, skb %p)\n", neigh, skb);
David Miller869759b2011-07-25 00:01:33 +0000270 to_atmarpd(act_need, PRIV(neigh->dev)->number, *ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271}
272
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700273static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274{
275#ifndef CONFIG_ATM_CLIP_NO_ICMP
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700276 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277#endif
278 kfree_skb(skb);
279}
280
Stephen Hemminger89d69d22009-09-01 11:13:19 +0000281static const struct neigh_ops clip_neigh_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 .family = AF_INET,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 .solicit = clip_neigh_solicit,
284 .error_report = clip_neigh_error,
David S. Miller8f40b162011-07-17 13:34:11 -0700285 .output = neigh_direct_output,
286 .connected_output = neigh_direct_output,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287};
288
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289static int clip_constructor(struct neighbour *neigh)
290{
David Miller869759b2011-07-25 00:01:33 +0000291 struct atmarp_entry *entry = neighbour_priv(neigh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
David Miller32092ec2011-07-25 00:01:41 +0000293 if (neigh->tbl->family != AF_INET)
294 return -EINVAL;
295
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700296 if (neigh->type != RTN_UNICAST)
297 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
David Miller32092ec2011-07-25 00:01:41 +0000299 neigh->nud_state = NUD_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 neigh->ops = &clip_neigh_ops;
David Miller32092ec2011-07-25 00:01:41 +0000301 neigh->output = neigh->ops->output;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 entry->neigh = neigh;
303 entry->vccs = NULL;
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700304 entry->expires = jiffies - 1;
David Miller32092ec2011-07-25 00:01:41 +0000305
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 return 0;
307}
308
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309/* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
310
311/*
312 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means
313 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also,
314 * don't increment the usage count. This is used to create entries in
315 * clip_setentry.
316 */
317
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700318static int clip_encap(struct atm_vcc *vcc, int mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319{
320 CLIP_VCC(vcc)->encap = mode;
321 return 0;
322}
323
Stephen Hemminger3c805a22009-08-31 19:50:42 +0000324static netdev_tx_t clip_start_xmit(struct sk_buff *skb,
325 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326{
327 struct clip_priv *clip_priv = PRIV(dev);
David S. Miller69cce1d2011-07-17 23:09:49 -0700328 struct dst_entry *dst = skb_dst(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 struct atmarp_entry *entry;
David S. Miller69cce1d2011-07-17 23:09:49 -0700330 struct neighbour *n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 struct atm_vcc *vcc;
David S. Miller7161c762012-02-01 17:23:11 -0500332 struct rtable *rt;
333 __be32 *daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 int old;
335 unsigned long flags;
336
Joe Perches99824462010-01-26 11:40:00 +0000337 pr_debug("(skb %p)\n", skb);
David S. Miller69cce1d2011-07-17 23:09:49 -0700338 if (!dst) {
Joe Perches99824462010-01-26 11:40:00 +0000339 pr_err("skb_dst(skb) == NULL\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 dev_kfree_skb(skb);
Stephen Hemminger1a6afe82009-01-09 13:01:00 +0000341 dev->stats.tx_dropped++;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000342 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 }
David S. Miller7161c762012-02-01 17:23:11 -0500344 rt = (struct rtable *) dst;
345 if (rt->rt_gateway)
346 daddr = &rt->rt_gateway;
347 else
348 daddr = &ip_hdr(skb)->daddr;
349 n = dst_neigh_lookup(dst, daddr);
David S. Miller69cce1d2011-07-17 23:09:49 -0700350 if (!n) {
Joe Perches99824462010-01-26 11:40:00 +0000351 pr_err("NO NEIGHBOUR !\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 dev_kfree_skb(skb);
Stephen Hemminger1a6afe82009-01-09 13:01:00 +0000353 dev->stats.tx_dropped++;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000354 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 }
David Miller869759b2011-07-25 00:01:33 +0000356 entry = neighbour_priv(n);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 if (!entry->vccs) {
358 if (time_after(jiffies, entry->expires)) {
359 /* should be resolved */
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700360 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ;
David Miller869759b2011-07-25 00:01:33 +0000361 to_atmarpd(act_need, PRIV(dev)->number, *((__be32 *)n->primary_key));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 }
363 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700364 skb_queue_tail(&entry->neigh->arp_queue, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 else {
366 dev_kfree_skb(skb);
Stephen Hemminger1a6afe82009-01-09 13:01:00 +0000367 dev->stats.tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 }
David S. Miller7161c762012-02-01 17:23:11 -0500369 goto out_release_neigh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 }
Stephen Hemminger52240062007-08-28 15:22:09 -0700371 pr_debug("neigh %p, vccs %p\n", entry, entry->vccs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
David S. Miller69cce1d2011-07-17 23:09:49 -0700373 pr_debug("using neighbour %p, vcc %p\n", n, vcc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 if (entry->vccs->encap) {
375 void *here;
376
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700377 here = skb_push(skb, RFC1483LLC_LEN);
378 memcpy(here, llc_oui, sizeof(llc_oui));
Al Viro30d492d2006-11-14 21:11:29 -0800379 ((__be16 *) here)[3] = skb->protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 }
381 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
382 ATM_SKB(skb)->atm_options = vcc->atm_options;
383 entry->vccs->last_use = jiffies;
Stephen Hemminger52240062007-08-28 15:22:09 -0700384 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700385 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 if (old) {
Joe Perchesef423a42014-09-09 21:17:28 -0700387 pr_warn("XOFF->XOFF transition\n");
David S. Miller7161c762012-02-01 17:23:11 -0500388 goto out_release_neigh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 }
Stephen Hemminger1a6afe82009-01-09 13:01:00 +0000390 dev->stats.tx_packets++;
391 dev->stats.tx_bytes += skb->len;
Stephen Hemminger5ff765f2006-04-14 16:00:59 -0700392 vcc->send(vcc, skb);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700393 if (atm_may_send(vcc, 0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 entry->vccs->xoff = 0;
David S. Miller7161c762012-02-01 17:23:11 -0500395 goto out_release_neigh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 }
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700397 spin_lock_irqsave(&clip_priv->xoff_lock, flags);
398 netif_stop_queue(dev); /* XOFF -> throttle immediately */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 barrier();
400 if (!entry->vccs->xoff)
401 netif_start_queue(dev);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700402 /* Oh, we just raced with clip_pop. netif_start_queue should be
403 good enough, because nothing should really be asleep because
404 of the brief netif_stop_queue. If this isn't true or if it
405 changes, use netif_wake_queue instead. */
406 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags);
David S. Miller7161c762012-02-01 17:23:11 -0500407out_release_neigh:
408 neigh_release(n);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000409 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410}
411
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700412static int clip_mkip(struct atm_vcc *vcc, int timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413{
414 struct clip_vcc *clip_vcc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700416 if (!vcc->push)
417 return -EBADFD;
418 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL);
419 if (!clip_vcc)
420 return -ENOMEM;
Joe Perches99824462010-01-26 11:40:00 +0000421 pr_debug("%p vcc %p\n", clip_vcc, vcc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 clip_vcc->vcc = vcc;
423 vcc->user_back = clip_vcc;
424 set_bit(ATM_VF_IS_CLIP, &vcc->flags);
425 clip_vcc->entry = NULL;
426 clip_vcc->xoff = 0;
427 clip_vcc->encap = 1;
428 clip_vcc->last_use = jiffies;
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700429 clip_vcc->idle_timeout = timeout * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 clip_vcc->old_push = vcc->push;
431 clip_vcc->old_pop = vcc->pop;
432 vcc->push = clip_push;
433 vcc->pop = clip_pop;
David S. Millerc40a27f2006-11-30 21:05:23 -0800434
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 /* re-process everything received between connection setup and MKIP */
Jorge Boncompte [DTI2]4e55f572011-11-21 10:25:57 +0000436 vcc_process_recv_queue(vcc);
Jorge Boncompte [DTI2]3b829362011-11-21 10:25:56 +0000437
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 return 0;
439}
440
Al Viro30d492d2006-11-14 21:11:29 -0800441static int clip_setentry(struct atm_vcc *vcc, __be32 ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442{
443 struct neighbour *neigh;
444 struct atmarp_entry *entry;
445 int error;
446 struct clip_vcc *clip_vcc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 struct rtable *rt;
448
449 if (vcc->push != clip_push) {
Joe Perchesef423a42014-09-09 21:17:28 -0700450 pr_warn("non-CLIP VCC\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 return -EBADF;
452 }
453 clip_vcc = CLIP_VCC(vcc);
454 if (!ip) {
455 if (!clip_vcc->entry) {
Joe Perches99824462010-01-26 11:40:00 +0000456 pr_err("hiding hidden ATMARP entry\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 return 0;
458 }
Joe Perches99824462010-01-26 11:40:00 +0000459 pr_debug("remove\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 unlink_clip_vcc(clip_vcc);
461 return 0;
462 }
David S. Miller78fbfd82011-03-12 00:00:52 -0500463 rt = ip_route_output(&init_net, ip, 0, 1, 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800464 if (IS_ERR(rt))
465 return PTR_ERR(rt);
David Miller32092ec2011-07-25 00:01:41 +0000466 neigh = __neigh_lookup(&arp_tbl, &ip, rt->dst.dev, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 ip_rt_put(rt);
468 if (!neigh)
469 return -ENOMEM;
David Miller869759b2011-07-25 00:01:33 +0000470 entry = neighbour_priv(neigh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 if (entry != clip_vcc->entry) {
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700472 if (!clip_vcc->entry)
Joe Perches99824462010-01-26 11:40:00 +0000473 pr_debug("add\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 else {
Joe Perches99824462010-01-26 11:40:00 +0000475 pr_debug("update\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 unlink_clip_vcc(clip_vcc);
477 }
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700478 link_vcc(clip_vcc, entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 }
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700480 error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
481 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 neigh_release(neigh);
483 return error;
484}
485
Stephen Hemmingerdde09752009-03-20 19:35:29 +0000486static const struct net_device_ops clip_netdev_ops = {
David Miller32092ec2011-07-25 00:01:41 +0000487 .ndo_start_xmit = clip_start_xmit,
488 .ndo_neigh_construct = clip_constructor,
Stephen Hemmingerdde09752009-03-20 19:35:29 +0000489};
490
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491static void clip_setup(struct net_device *dev)
492{
Stephen Hemmingerdde09752009-03-20 19:35:29 +0000493 dev->netdev_ops = &clip_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 dev->type = ARPHRD_ATM;
David Miller596b9b62011-07-25 00:01:25 +0000495 dev->neigh_priv_len = sizeof(struct atmarp_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 dev->hard_header_len = RFC1483LLC_LEN;
497 dev->mtu = RFC1626_MTU;
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700498 dev->tx_queue_len = 100; /* "normal" queue (packets) */
499 /* When using a "real" qdisc, the qdisc determines the queue */
500 /* length. tx_queue_len is only used for the default case, */
501 /* without any more elaborate queuing. 100 is a reasonable */
502 /* compromise between decent burst-tolerance and protection */
503 /* against memory hogs. */
Eric Dumazet02875872014-10-05 18:38:35 -0700504 netif_keep_dst(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505}
506
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507static int clip_create(int number)
508{
509 struct net_device *dev;
510 struct clip_priv *clip_priv;
511 int error;
512
513 if (number != -1) {
514 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700515 if (PRIV(dev)->number == number)
516 return -EEXIST;
517 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 number = 0;
519 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
520 if (PRIV(dev)->number >= number)
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700521 number = PRIV(dev)->number + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 }
Tom Gundersenc835a672014-07-14 16:37:24 +0200523 dev = alloc_netdev(sizeof(struct clip_priv), "", NET_NAME_UNKNOWN,
524 clip_setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 if (!dev)
526 return -ENOMEM;
527 clip_priv = PRIV(dev);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700528 sprintf(dev->name, "atm%d", number);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 spin_lock_init(&clip_priv->xoff_lock);
530 clip_priv->number = number;
531 error = register_netdev(dev);
532 if (error) {
533 free_netdev(dev);
534 return error;
535 }
536 clip_priv->next = clip_devs;
537 clip_devs = dev;
Stephen Hemminger52240062007-08-28 15:22:09 -0700538 pr_debug("registered (net:%s)\n", dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 return number;
540}
541
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700542static int clip_device_event(struct notifier_block *this, unsigned long event,
Jiri Pirko351638e2013-05-28 01:30:21 +0000543 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544{
Jiri Pirko351638e2013-05-28 01:30:21 +0000545 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700546
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700547 if (!net_eq(dev_net(dev), &init_net))
Eric W. Biedermane9dc8652007-09-12 13:02:17 +0200548 return NOTIFY_DONE;
549
David Miller32092ec2011-07-25 00:01:41 +0000550 if (event == NETDEV_UNREGISTER)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 return NOTIFY_DONE;
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700552
553 /* ignore non-CLIP devices */
Stephen Hemmingerdde09752009-03-20 19:35:29 +0000554 if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops)
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700555 return NOTIFY_DONE;
556
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 switch (event) {
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700558 case NETDEV_UP:
Joe Perches99824462010-01-26 11:40:00 +0000559 pr_debug("NETDEV_UP\n");
Stephen Hemminger5ff765f2006-04-14 16:00:59 -0700560 to_atmarpd(act_up, PRIV(dev)->number, 0);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700561 break;
562 case NETDEV_GOING_DOWN:
Joe Perches99824462010-01-26 11:40:00 +0000563 pr_debug("NETDEV_DOWN\n");
Stephen Hemminger5ff765f2006-04-14 16:00:59 -0700564 to_atmarpd(act_down, PRIV(dev)->number, 0);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700565 break;
566 case NETDEV_CHANGE:
567 case NETDEV_CHANGEMTU:
Joe Perches99824462010-01-26 11:40:00 +0000568 pr_debug("NETDEV_CHANGE*\n");
Stephen Hemminger5ff765f2006-04-14 16:00:59 -0700569 to_atmarpd(act_change, PRIV(dev)->number, 0);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700570 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 }
572 return NOTIFY_DONE;
573}
574
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700575static int clip_inet_event(struct notifier_block *this, unsigned long event,
576 void *ifa)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577{
578 struct in_device *in_dev;
Cong Wang75538c22013-05-29 11:30:50 +0800579 struct netdev_notifier_info info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700581 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 /*
583 * Transitions are of the down-change-up type, so it's sufficient to
584 * handle the change on up.
585 */
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700586 if (event != NETDEV_UP)
587 return NOTIFY_DONE;
Cong Wang75538c22013-05-29 11:30:50 +0800588 netdev_notifier_info_init(&info, in_dev->dev);
589 return clip_device_event(this, NETDEV_CHANGE, &info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590}
591
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592static struct notifier_block clip_dev_notifier = {
Stephen Hemminger5ff765f2006-04-14 16:00:59 -0700593 .notifier_call = clip_device_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594};
595
596
597
598static struct notifier_block clip_inet_notifier = {
Stephen Hemminger5ff765f2006-04-14 16:00:59 -0700599 .notifier_call = clip_inet_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600};
601
602
603
604static void atmarpd_close(struct atm_vcc *vcc)
605{
Joe Perches99824462010-01-26 11:40:00 +0000606 pr_debug("\n");
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700607
608 rtnl_lock();
609 atmarpd = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700611 rtnl_unlock();
612
Stephen Hemminger52240062007-08-28 15:22:09 -0700613 pr_debug("(done)\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 module_put(THIS_MODULE);
615}
616
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617static struct atmdev_ops atmarpd_dev_ops = {
618 .close = atmarpd_close
619};
620
621
622static struct atm_dev atmarpd_dev = {
623 .ops = &atmarpd_dev_ops,
624 .type = "arpd",
625 .number = 999,
Milind Arun Choudhary4ef8d0a2007-04-26 01:37:44 -0700626 .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627};
628
629
630static int atm_init_atmarp(struct atm_vcc *vcc)
631{
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700632 rtnl_lock();
633 if (atmarpd) {
634 rtnl_unlock();
635 return -EADDRINUSE;
636 }
637
Joe Perchese956ea12010-01-26 11:40:05 +0000638 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
Stephen Hemminger2d907392006-04-14 15:56:02 -0700639
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 atmarpd = vcc;
Joe Perchese956ea12010-01-26 11:40:05 +0000641 set_bit(ATM_VF_META, &vcc->flags);
642 set_bit(ATM_VF_READY, &vcc->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 /* allow replies and avoid getting closed if signaling dies */
644 vcc->dev = &atmarpd_dev;
645 vcc_insert_socket(sk_atm(vcc));
646 vcc->push = NULL;
647 vcc->pop = NULL; /* crash */
648 vcc->push_oam = NULL; /* crash */
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700649 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 return 0;
651}
652
653static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
654{
655 struct atm_vcc *vcc = ATM_SD(sock);
656 int err = 0;
657
658 switch (cmd) {
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700659 case SIOCMKCLIP:
660 case ATMARPD_CTRL:
661 case ATMARP_MKIP:
662 case ATMARP_SETENTRY:
663 case ATMARP_ENCAP:
664 if (!capable(CAP_NET_ADMIN))
665 return -EPERM;
666 break;
667 default:
668 return -ENOIOCTLCMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 }
670
671 switch (cmd) {
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700672 case SIOCMKCLIP:
673 err = clip_create(arg);
674 break;
675 case ATMARPD_CTRL:
676 err = atm_init_atmarp(vcc);
677 if (!err) {
678 sock->state = SS_CONNECTED;
679 __module_get(THIS_MODULE);
680 }
681 break;
682 case ATMARP_MKIP:
683 err = clip_mkip(vcc, arg);
684 break;
685 case ATMARP_SETENTRY:
Al Viro30d492d2006-11-14 21:11:29 -0800686 err = clip_setentry(vcc, (__force __be32)arg);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700687 break;
688 case ATMARP_ENCAP:
689 err = clip_encap(vcc, arg);
690 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 }
692 return err;
693}
694
695static struct atm_ioctl clip_ioctl_ops = {
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700696 .owner = THIS_MODULE,
697 .ioctl = clip_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698};
699
700#ifdef CONFIG_PROC_FS
701
702static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
703{
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700704 static int code[] = { 1, 2, 10, 6, 1, 0 };
705 static int e164[] = { 1, 8, 4, 6, 1, 0 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706
707 if (*addr->sas_addr.pub) {
708 seq_printf(seq, "%s", addr->sas_addr.pub);
709 if (*addr->sas_addr.prv)
710 seq_putc(seq, '+');
711 } else if (!*addr->sas_addr.prv) {
712 seq_printf(seq, "%s", "(none)");
713 return;
714 }
715 if (*addr->sas_addr.prv) {
716 unsigned char *prv = addr->sas_addr.prv;
717 int *fields;
718 int i, j;
719
720 fields = *prv == ATM_AFI_E164 ? e164 : code;
721 for (i = 0; fields[i]; i++) {
722 for (j = fields[i]; j; j--)
723 seq_printf(seq, "%02X", *prv++);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700724 if (fields[i + 1])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 seq_putc(seq, '.');
726 }
727 }
728}
729
730/* This means the neighbour entry has no attached VCC objects. */
731#define SEQ_NO_VCC_TOKEN ((void *) 2)
732
David Miller869759b2011-07-25 00:01:33 +0000733static void atmarp_info(struct seq_file *seq, struct neighbour *n,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
735{
David Miller869759b2011-07-25 00:01:33 +0000736 struct net_device *dev = n->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 unsigned long exp;
738 char buf[17];
739 int svc, llc, off;
740
741 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
742 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC));
743
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700744 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745
746 if (clip_vcc == SEQ_NO_VCC_TOKEN)
747 exp = entry->neigh->used;
748 else
749 exp = clip_vcc->last_use;
750
751 exp = (jiffies - exp) / HZ;
752
753 seq_printf(seq, "%-6s%-4s%-4s%5ld ",
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700754 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755
David Miller869759b2011-07-25 00:01:33 +0000756 off = scnprintf(buf, sizeof(buf) - 1, "%pI4", n->primary_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 while (off < 16)
758 buf[off++] = ' ';
759 buf[off] = '\0';
760 seq_printf(seq, "%s", buf);
761
762 if (clip_vcc == SEQ_NO_VCC_TOKEN) {
763 if (time_before(jiffies, entry->expires))
764 seq_printf(seq, "(resolving)\n");
765 else
766 seq_printf(seq, "(expired, ref %d)\n",
767 atomic_read(&entry->neigh->refcnt));
768 } else if (!svc) {
769 seq_printf(seq, "%d.%d.%d\n",
770 clip_vcc->vcc->dev->number,
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700771 clip_vcc->vcc->vpi, clip_vcc->vcc->vci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 } else {
773 svc_addr(seq, &clip_vcc->vcc->remote);
774 seq_putc(seq, '\n');
775 }
776}
777
778struct clip_seq_state {
779 /* This member must be first. */
780 struct neigh_seq_state ns;
781
782 /* Local to clip specific iteration. */
783 struct clip_vcc *vcc;
784};
785
786static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e,
787 struct clip_vcc *curr)
788{
789 if (!curr) {
790 curr = e->vccs;
791 if (!curr)
792 return SEQ_NO_VCC_TOKEN;
793 return curr;
794 }
795 if (curr == SEQ_NO_VCC_TOKEN)
796 return NULL;
797
798 curr = curr->next;
799
800 return curr;
801}
802
803static void *clip_seq_vcc_walk(struct clip_seq_state *state,
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700804 struct atmarp_entry *e, loff_t * pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805{
806 struct clip_vcc *vcc = state->vcc;
807
808 vcc = clip_seq_next_vcc(e, vcc);
809 if (vcc && pos != NULL) {
810 while (*pos) {
811 vcc = clip_seq_next_vcc(e, vcc);
812 if (!vcc)
813 break;
814 --(*pos);
815 }
816 }
817 state->vcc = vcc;
818
819 return vcc;
820}
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700821
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700823 struct neighbour *n, loff_t * pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824{
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700825 struct clip_seq_state *state = (struct clip_seq_state *)_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826
David Miller32092ec2011-07-25 00:01:41 +0000827 if (n->dev->type != ARPHRD_ATM)
828 return NULL;
829
David Miller869759b2011-07-25 00:01:33 +0000830 return clip_seq_vcc_walk(state, neighbour_priv(n), pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831}
832
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700833static void *clip_seq_start(struct seq_file *seq, loff_t * pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834{
Denis V. Lunevae221202008-01-10 03:52:35 -0800835 struct clip_seq_state *state = seq->private;
836 state->ns.neigh_sub_iter = clip_seq_sub_iter;
David Miller32092ec2011-07-25 00:01:41 +0000837 return neigh_seq_start(seq, pos, &arp_tbl, NEIGH_SEQ_NEIGH_ONLY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838}
839
840static int clip_seq_show(struct seq_file *seq, void *v)
841{
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700842 static char atm_arp_banner[] =
843 "IPitf TypeEncp Idle IP address ATM address\n";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844
845 if (v == SEQ_START_TOKEN) {
846 seq_puts(seq, atm_arp_banner);
847 } else {
848 struct clip_seq_state *state = seq->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 struct clip_vcc *vcc = state->vcc;
David Miller869759b2011-07-25 00:01:33 +0000850 struct neighbour *n = v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851
David Miller869759b2011-07-25 00:01:33 +0000852 atmarp_info(seq, n, neighbour_priv(n), vcc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 }
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700854 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855}
856
Philippe De Muyter56b3d972007-07-10 23:07:31 -0700857static const struct seq_operations arp_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 .start = clip_seq_start,
859 .next = neigh_seq_next,
860 .stop = neigh_seq_stop,
861 .show = clip_seq_show,
862};
863
864static int arp_seq_open(struct inode *inode, struct file *file)
865{
Denis V. Lunevae221202008-01-10 03:52:35 -0800866 return seq_open_net(inode, file, &arp_seq_ops,
867 sizeof(struct clip_seq_state));
Eric W. Biederman426b5302008-01-24 00:13:18 -0800868}
869
Arjan van de Ven9a321442007-02-12 00:55:35 -0800870static const struct file_operations arp_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 .open = arp_seq_open,
872 .read = seq_read,
873 .llseek = seq_lseek,
Denis V. Lunevae221202008-01-10 03:52:35 -0800874 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 .owner = THIS_MODULE
876};
877#endif
878
Wang Chendbee0d32008-03-23 21:45:36 -0700879static void atm_clip_exit_noproc(void);
880
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881static int __init atm_clip_init(void)
882{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 register_atm_ioctl(&clip_ioctl_ops);
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700884 register_netdevice_notifier(&clip_dev_notifier);
885 register_inetaddr_notifier(&clip_inet_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886
Stephen Hemminger2d907392006-04-14 15:56:02 -0700887 setup_timer(&idle_timer, idle_timer_check, 0);
888
Adrian Bunk24781732006-07-09 12:13:18 -0700889#ifdef CONFIG_PROC_FS
890 {
891 struct proc_dir_entry *p;
892
Wang Chen16e297b2008-02-28 13:55:45 -0800893 p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops);
Wang Chendbee0d32008-03-23 21:45:36 -0700894 if (!p) {
Joe Perches99824462010-01-26 11:40:00 +0000895 pr_err("Unable to initialize /proc/net/atm/arp\n");
Wang Chendbee0d32008-03-23 21:45:36 -0700896 atm_clip_exit_noproc();
897 return -ENOMEM;
898 }
Adrian Bunk24781732006-07-09 12:13:18 -0700899 }
900#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901
902 return 0;
903}
904
Wang Chendbee0d32008-03-23 21:45:36 -0700905static void atm_clip_exit_noproc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906{
907 struct net_device *dev, *next;
908
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700909 unregister_inetaddr_notifier(&clip_inet_notifier);
910 unregister_netdevice_notifier(&clip_dev_notifier);
911
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 deregister_atm_ioctl(&clip_ioctl_ops);
913
914 /* First, stop the idle timer, so it stops banging
915 * on the table.
916 */
Stephen Hemminger2d907392006-04-14 15:56:02 -0700917 del_timer_sync(&idle_timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 dev = clip_devs;
920 while (dev) {
921 next = PRIV(dev)->next;
922 unregister_netdev(dev);
923 free_netdev(dev);
924 dev = next;
925 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926}
927
Wang Chendbee0d32008-03-23 21:45:36 -0700928static void __exit atm_clip_exit(void)
929{
930 remove_proc_entry("arp", atm_proc_root);
931
932 atm_clip_exit_noproc();
933}
934
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935module_init(atm_clip_init);
936module_exit(atm_clip_exit);
Stephen Hemminger4909e4882006-04-14 16:01:26 -0700937MODULE_AUTHOR("Werner Almesberger");
938MODULE_DESCRIPTION("Classical/IP over ATM interface");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939MODULE_LICENSE("GPL");