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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,
Roopa Prabhu7b8f7a42017-03-19 22:01:28 -0700109 NEIGH_UPDATE_F_ADMIN, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 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
Jiri Pirko503eebc2016-07-05 11:27:37 +0200289static int clip_constructor(struct net_device *dev, struct neighbour *neigh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290{
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{
Sasha Levin34f5b002015-09-16 15:30:21 -0400320 if (!CLIP_VCC(vcc))
321 return -EBADFD;
322
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 CLIP_VCC(vcc)->encap = mode;
324 return 0;
325}
326
Stephen Hemminger3c805a22009-08-31 19:50:42 +0000327static netdev_tx_t clip_start_xmit(struct sk_buff *skb,
328 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329{
330 struct clip_priv *clip_priv = PRIV(dev);
David S. Miller69cce1d2011-07-17 23:09:49 -0700331 struct dst_entry *dst = skb_dst(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 struct atmarp_entry *entry;
David S. Miller69cce1d2011-07-17 23:09:49 -0700333 struct neighbour *n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 struct atm_vcc *vcc;
David S. Miller7161c762012-02-01 17:23:11 -0500335 struct rtable *rt;
336 __be32 *daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 int old;
338 unsigned long flags;
339
Joe Perches99824462010-01-26 11:40:00 +0000340 pr_debug("(skb %p)\n", skb);
David S. Miller69cce1d2011-07-17 23:09:49 -0700341 if (!dst) {
Joe Perches99824462010-01-26 11:40:00 +0000342 pr_err("skb_dst(skb) == NULL\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 dev_kfree_skb(skb);
Stephen Hemminger1a6afe82009-01-09 13:01:00 +0000344 dev->stats.tx_dropped++;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000345 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 }
David S. Miller7161c762012-02-01 17:23:11 -0500347 rt = (struct rtable *) dst;
348 if (rt->rt_gateway)
349 daddr = &rt->rt_gateway;
350 else
351 daddr = &ip_hdr(skb)->daddr;
352 n = dst_neigh_lookup(dst, daddr);
David S. Miller69cce1d2011-07-17 23:09:49 -0700353 if (!n) {
Joe Perches99824462010-01-26 11:40:00 +0000354 pr_err("NO NEIGHBOUR !\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 dev_kfree_skb(skb);
Stephen Hemminger1a6afe82009-01-09 13:01:00 +0000356 dev->stats.tx_dropped++;
Patrick McHardy6ed10652009-06-23 06:03:08 +0000357 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 }
David Miller869759b2011-07-25 00:01:33 +0000359 entry = neighbour_priv(n);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 if (!entry->vccs) {
361 if (time_after(jiffies, entry->expires)) {
362 /* should be resolved */
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700363 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ;
David Miller869759b2011-07-25 00:01:33 +0000364 to_atmarpd(act_need, PRIV(dev)->number, *((__be32 *)n->primary_key));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 }
366 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700367 skb_queue_tail(&entry->neigh->arp_queue, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 else {
369 dev_kfree_skb(skb);
Stephen Hemminger1a6afe82009-01-09 13:01:00 +0000370 dev->stats.tx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 }
David S. Miller7161c762012-02-01 17:23:11 -0500372 goto out_release_neigh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 }
Stephen Hemminger52240062007-08-28 15:22:09 -0700374 pr_debug("neigh %p, vccs %p\n", entry, entry->vccs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
David S. Miller69cce1d2011-07-17 23:09:49 -0700376 pr_debug("using neighbour %p, vcc %p\n", n, vcc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 if (entry->vccs->encap) {
378 void *here;
379
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700380 here = skb_push(skb, RFC1483LLC_LEN);
381 memcpy(here, llc_oui, sizeof(llc_oui));
Al Viro30d492d2006-11-14 21:11:29 -0800382 ((__be16 *) here)[3] = skb->protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 }
384 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
385 ATM_SKB(skb)->atm_options = vcc->atm_options;
386 entry->vccs->last_use = jiffies;
Stephen Hemminger52240062007-08-28 15:22:09 -0700387 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700388 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 if (old) {
Joe Perchesef423a42014-09-09 21:17:28 -0700390 pr_warn("XOFF->XOFF transition\n");
David S. Miller7161c762012-02-01 17:23:11 -0500391 goto out_release_neigh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 }
Stephen Hemminger1a6afe82009-01-09 13:01:00 +0000393 dev->stats.tx_packets++;
394 dev->stats.tx_bytes += skb->len;
Stephen Hemminger5ff765f2006-04-14 16:00:59 -0700395 vcc->send(vcc, skb);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700396 if (atm_may_send(vcc, 0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 entry->vccs->xoff = 0;
David S. Miller7161c762012-02-01 17:23:11 -0500398 goto out_release_neigh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 }
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700400 spin_lock_irqsave(&clip_priv->xoff_lock, flags);
401 netif_stop_queue(dev); /* XOFF -> throttle immediately */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 barrier();
403 if (!entry->vccs->xoff)
404 netif_start_queue(dev);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700405 /* Oh, we just raced with clip_pop. netif_start_queue should be
406 good enough, because nothing should really be asleep because
407 of the brief netif_stop_queue. If this isn't true or if it
408 changes, use netif_wake_queue instead. */
409 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags);
David S. Miller7161c762012-02-01 17:23:11 -0500410out_release_neigh:
411 neigh_release(n);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000412 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413}
414
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700415static int clip_mkip(struct atm_vcc *vcc, int timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416{
417 struct clip_vcc *clip_vcc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700419 if (!vcc->push)
420 return -EBADFD;
421 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL);
422 if (!clip_vcc)
423 return -ENOMEM;
Joe Perches99824462010-01-26 11:40:00 +0000424 pr_debug("%p vcc %p\n", clip_vcc, vcc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 clip_vcc->vcc = vcc;
426 vcc->user_back = clip_vcc;
427 set_bit(ATM_VF_IS_CLIP, &vcc->flags);
428 clip_vcc->entry = NULL;
429 clip_vcc->xoff = 0;
430 clip_vcc->encap = 1;
431 clip_vcc->last_use = jiffies;
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700432 clip_vcc->idle_timeout = timeout * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 clip_vcc->old_push = vcc->push;
434 clip_vcc->old_pop = vcc->pop;
435 vcc->push = clip_push;
436 vcc->pop = clip_pop;
David S. Millerc40a27f2006-11-30 21:05:23 -0800437
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 /* re-process everything received between connection setup and MKIP */
Jorge Boncompte [DTI2]4e55f572011-11-21 10:25:57 +0000439 vcc_process_recv_queue(vcc);
Jorge Boncompte [DTI2]3b829362011-11-21 10:25:56 +0000440
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 return 0;
442}
443
Al Viro30d492d2006-11-14 21:11:29 -0800444static int clip_setentry(struct atm_vcc *vcc, __be32 ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445{
446 struct neighbour *neigh;
447 struct atmarp_entry *entry;
448 int error;
449 struct clip_vcc *clip_vcc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 struct rtable *rt;
451
452 if (vcc->push != clip_push) {
Joe Perchesef423a42014-09-09 21:17:28 -0700453 pr_warn("non-CLIP VCC\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 return -EBADF;
455 }
456 clip_vcc = CLIP_VCC(vcc);
457 if (!ip) {
458 if (!clip_vcc->entry) {
Joe Perches99824462010-01-26 11:40:00 +0000459 pr_err("hiding hidden ATMARP entry\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 return 0;
461 }
Joe Perches99824462010-01-26 11:40:00 +0000462 pr_debug("remove\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 unlink_clip_vcc(clip_vcc);
464 return 0;
465 }
David S. Miller78fbfd82011-03-12 00:00:52 -0500466 rt = ip_route_output(&init_net, ip, 0, 1, 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -0800467 if (IS_ERR(rt))
468 return PTR_ERR(rt);
David Miller32092ec2011-07-25 00:01:41 +0000469 neigh = __neigh_lookup(&arp_tbl, &ip, rt->dst.dev, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 ip_rt_put(rt);
471 if (!neigh)
472 return -ENOMEM;
David Miller869759b2011-07-25 00:01:33 +0000473 entry = neighbour_priv(neigh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 if (entry != clip_vcc->entry) {
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700475 if (!clip_vcc->entry)
Joe Perches99824462010-01-26 11:40:00 +0000476 pr_debug("add\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 else {
Joe Perches99824462010-01-26 11:40:00 +0000478 pr_debug("update\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 unlink_clip_vcc(clip_vcc);
480 }
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700481 link_vcc(clip_vcc, entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 }
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700483 error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
Roopa Prabhu7b8f7a42017-03-19 22:01:28 -0700484 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 neigh_release(neigh);
486 return error;
487}
488
Stephen Hemmingerdde09752009-03-20 19:35:29 +0000489static const struct net_device_ops clip_netdev_ops = {
David Miller32092ec2011-07-25 00:01:41 +0000490 .ndo_start_xmit = clip_start_xmit,
491 .ndo_neigh_construct = clip_constructor,
Stephen Hemmingerdde09752009-03-20 19:35:29 +0000492};
493
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494static void clip_setup(struct net_device *dev)
495{
Stephen Hemmingerdde09752009-03-20 19:35:29 +0000496 dev->netdev_ops = &clip_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 dev->type = ARPHRD_ATM;
David Miller596b9b62011-07-25 00:01:25 +0000498 dev->neigh_priv_len = sizeof(struct atmarp_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 dev->hard_header_len = RFC1483LLC_LEN;
500 dev->mtu = RFC1626_MTU;
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700501 dev->tx_queue_len = 100; /* "normal" queue (packets) */
502 /* When using a "real" qdisc, the qdisc determines the queue */
503 /* length. tx_queue_len is only used for the default case, */
504 /* without any more elaborate queuing. 100 is a reasonable */
505 /* compromise between decent burst-tolerance and protection */
506 /* against memory hogs. */
Eric Dumazet02875872014-10-05 18:38:35 -0700507 netif_keep_dst(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508}
509
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510static int clip_create(int number)
511{
512 struct net_device *dev;
513 struct clip_priv *clip_priv;
514 int error;
515
516 if (number != -1) {
517 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700518 if (PRIV(dev)->number == number)
519 return -EEXIST;
520 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 number = 0;
522 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
523 if (PRIV(dev)->number >= number)
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700524 number = PRIV(dev)->number + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 }
Tom Gundersenc835a672014-07-14 16:37:24 +0200526 dev = alloc_netdev(sizeof(struct clip_priv), "", NET_NAME_UNKNOWN,
527 clip_setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 if (!dev)
529 return -ENOMEM;
530 clip_priv = PRIV(dev);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700531 sprintf(dev->name, "atm%d", number);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 spin_lock_init(&clip_priv->xoff_lock);
533 clip_priv->number = number;
534 error = register_netdev(dev);
535 if (error) {
536 free_netdev(dev);
537 return error;
538 }
539 clip_priv->next = clip_devs;
540 clip_devs = dev;
Stephen Hemminger52240062007-08-28 15:22:09 -0700541 pr_debug("registered (net:%s)\n", dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 return number;
543}
544
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700545static int clip_device_event(struct notifier_block *this, unsigned long event,
Jiri Pirko351638e2013-05-28 01:30:21 +0000546 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547{
Jiri Pirko351638e2013-05-28 01:30:21 +0000548 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700549
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700550 if (!net_eq(dev_net(dev), &init_net))
Eric W. Biedermane9dc8652007-09-12 13:02:17 +0200551 return NOTIFY_DONE;
552
David Miller32092ec2011-07-25 00:01:41 +0000553 if (event == NETDEV_UNREGISTER)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 return NOTIFY_DONE;
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700555
556 /* ignore non-CLIP devices */
Stephen Hemmingerdde09752009-03-20 19:35:29 +0000557 if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops)
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700558 return NOTIFY_DONE;
559
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 switch (event) {
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700561 case NETDEV_UP:
Joe Perches99824462010-01-26 11:40:00 +0000562 pr_debug("NETDEV_UP\n");
Stephen Hemminger5ff765f2006-04-14 16:00:59 -0700563 to_atmarpd(act_up, PRIV(dev)->number, 0);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700564 break;
565 case NETDEV_GOING_DOWN:
Joe Perches99824462010-01-26 11:40:00 +0000566 pr_debug("NETDEV_DOWN\n");
Stephen Hemminger5ff765f2006-04-14 16:00:59 -0700567 to_atmarpd(act_down, PRIV(dev)->number, 0);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700568 break;
569 case NETDEV_CHANGE:
570 case NETDEV_CHANGEMTU:
Joe Perches99824462010-01-26 11:40:00 +0000571 pr_debug("NETDEV_CHANGE*\n");
Stephen Hemminger5ff765f2006-04-14 16:00:59 -0700572 to_atmarpd(act_change, PRIV(dev)->number, 0);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700573 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 }
575 return NOTIFY_DONE;
576}
577
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700578static int clip_inet_event(struct notifier_block *this, unsigned long event,
579 void *ifa)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580{
581 struct in_device *in_dev;
Cong Wang75538c22013-05-29 11:30:50 +0800582 struct netdev_notifier_info info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700584 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 /*
586 * Transitions are of the down-change-up type, so it's sufficient to
587 * handle the change on up.
588 */
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700589 if (event != NETDEV_UP)
590 return NOTIFY_DONE;
Cong Wang75538c22013-05-29 11:30:50 +0800591 netdev_notifier_info_init(&info, in_dev->dev);
592 return clip_device_event(this, NETDEV_CHANGE, &info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593}
594
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595static struct notifier_block clip_dev_notifier = {
Stephen Hemminger5ff765f2006-04-14 16:00:59 -0700596 .notifier_call = clip_device_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597};
598
599
600
601static struct notifier_block clip_inet_notifier = {
Stephen Hemminger5ff765f2006-04-14 16:00:59 -0700602 .notifier_call = clip_inet_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603};
604
605
606
607static void atmarpd_close(struct atm_vcc *vcc)
608{
Joe Perches99824462010-01-26 11:40:00 +0000609 pr_debug("\n");
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700610
611 rtnl_lock();
612 atmarpd = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700614 rtnl_unlock();
615
Stephen Hemminger52240062007-08-28 15:22:09 -0700616 pr_debug("(done)\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 module_put(THIS_MODULE);
618}
619
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620static struct atmdev_ops atmarpd_dev_ops = {
621 .close = atmarpd_close
622};
623
624
625static struct atm_dev atmarpd_dev = {
626 .ops = &atmarpd_dev_ops,
627 .type = "arpd",
628 .number = 999,
Milind Arun Choudhary4ef8d0a2007-04-26 01:37:44 -0700629 .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630};
631
632
633static int atm_init_atmarp(struct atm_vcc *vcc)
634{
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700635 rtnl_lock();
636 if (atmarpd) {
637 rtnl_unlock();
638 return -EADDRINUSE;
639 }
640
Joe Perchese956ea12010-01-26 11:40:05 +0000641 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
Stephen Hemminger2d907392006-04-14 15:56:02 -0700642
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 atmarpd = vcc;
Joe Perchese956ea12010-01-26 11:40:05 +0000644 set_bit(ATM_VF_META, &vcc->flags);
645 set_bit(ATM_VF_READY, &vcc->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 /* allow replies and avoid getting closed if signaling dies */
647 vcc->dev = &atmarpd_dev;
648 vcc_insert_socket(sk_atm(vcc));
649 vcc->push = NULL;
650 vcc->pop = NULL; /* crash */
651 vcc->push_oam = NULL; /* crash */
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700652 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 return 0;
654}
655
656static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
657{
658 struct atm_vcc *vcc = ATM_SD(sock);
659 int err = 0;
660
661 switch (cmd) {
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700662 case SIOCMKCLIP:
663 case ATMARPD_CTRL:
664 case ATMARP_MKIP:
665 case ATMARP_SETENTRY:
666 case ATMARP_ENCAP:
667 if (!capable(CAP_NET_ADMIN))
668 return -EPERM;
669 break;
670 default:
671 return -ENOIOCTLCMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 }
673
674 switch (cmd) {
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700675 case SIOCMKCLIP:
676 err = clip_create(arg);
677 break;
678 case ATMARPD_CTRL:
679 err = atm_init_atmarp(vcc);
680 if (!err) {
681 sock->state = SS_CONNECTED;
682 __module_get(THIS_MODULE);
683 }
684 break;
685 case ATMARP_MKIP:
686 err = clip_mkip(vcc, arg);
687 break;
688 case ATMARP_SETENTRY:
Al Viro30d492d2006-11-14 21:11:29 -0800689 err = clip_setentry(vcc, (__force __be32)arg);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700690 break;
691 case ATMARP_ENCAP:
692 err = clip_encap(vcc, arg);
693 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 }
695 return err;
696}
697
698static struct atm_ioctl clip_ioctl_ops = {
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700699 .owner = THIS_MODULE,
700 .ioctl = clip_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701};
702
703#ifdef CONFIG_PROC_FS
704
705static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
706{
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700707 static int code[] = { 1, 2, 10, 6, 1, 0 };
708 static int e164[] = { 1, 8, 4, 6, 1, 0 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709
710 if (*addr->sas_addr.pub) {
711 seq_printf(seq, "%s", addr->sas_addr.pub);
712 if (*addr->sas_addr.prv)
713 seq_putc(seq, '+');
714 } else if (!*addr->sas_addr.prv) {
715 seq_printf(seq, "%s", "(none)");
716 return;
717 }
718 if (*addr->sas_addr.prv) {
719 unsigned char *prv = addr->sas_addr.prv;
720 int *fields;
721 int i, j;
722
723 fields = *prv == ATM_AFI_E164 ? e164 : code;
724 for (i = 0; fields[i]; i++) {
725 for (j = fields[i]; j; j--)
726 seq_printf(seq, "%02X", *prv++);
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700727 if (fields[i + 1])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 seq_putc(seq, '.');
729 }
730 }
731}
732
733/* This means the neighbour entry has no attached VCC objects. */
734#define SEQ_NO_VCC_TOKEN ((void *) 2)
735
David Miller869759b2011-07-25 00:01:33 +0000736static void atmarp_info(struct seq_file *seq, struct neighbour *n,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
738{
David Miller869759b2011-07-25 00:01:33 +0000739 struct net_device *dev = n->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 unsigned long exp;
741 char buf[17];
742 int svc, llc, off;
743
744 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
745 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC));
746
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700747 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748
749 if (clip_vcc == SEQ_NO_VCC_TOKEN)
750 exp = entry->neigh->used;
751 else
752 exp = clip_vcc->last_use;
753
754 exp = (jiffies - exp) / HZ;
755
756 seq_printf(seq, "%-6s%-4s%-4s%5ld ",
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700757 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758
David Miller869759b2011-07-25 00:01:33 +0000759 off = scnprintf(buf, sizeof(buf) - 1, "%pI4", n->primary_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 while (off < 16)
761 buf[off++] = ' ';
762 buf[off] = '\0';
763 seq_printf(seq, "%s", buf);
764
765 if (clip_vcc == SEQ_NO_VCC_TOKEN) {
766 if (time_before(jiffies, entry->expires))
767 seq_printf(seq, "(resolving)\n");
768 else
769 seq_printf(seq, "(expired, ref %d)\n",
770 atomic_read(&entry->neigh->refcnt));
771 } else if (!svc) {
772 seq_printf(seq, "%d.%d.%d\n",
773 clip_vcc->vcc->dev->number,
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700774 clip_vcc->vcc->vpi, clip_vcc->vcc->vci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 } else {
776 svc_addr(seq, &clip_vcc->vcc->remote);
777 seq_putc(seq, '\n');
778 }
779}
780
781struct clip_seq_state {
782 /* This member must be first. */
783 struct neigh_seq_state ns;
784
785 /* Local to clip specific iteration. */
786 struct clip_vcc *vcc;
787};
788
789static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e,
790 struct clip_vcc *curr)
791{
792 if (!curr) {
793 curr = e->vccs;
794 if (!curr)
795 return SEQ_NO_VCC_TOKEN;
796 return curr;
797 }
798 if (curr == SEQ_NO_VCC_TOKEN)
799 return NULL;
800
801 curr = curr->next;
802
803 return curr;
804}
805
806static void *clip_seq_vcc_walk(struct clip_seq_state *state,
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700807 struct atmarp_entry *e, loff_t * pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808{
809 struct clip_vcc *vcc = state->vcc;
810
811 vcc = clip_seq_next_vcc(e, vcc);
812 if (vcc && pos != NULL) {
813 while (*pos) {
814 vcc = clip_seq_next_vcc(e, vcc);
815 if (!vcc)
816 break;
817 --(*pos);
818 }
819 }
820 state->vcc = vcc;
821
822 return vcc;
823}
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700824
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700826 struct neighbour *n, loff_t * pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827{
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700828 struct clip_seq_state *state = (struct clip_seq_state *)_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829
David Miller32092ec2011-07-25 00:01:41 +0000830 if (n->dev->type != ARPHRD_ATM)
831 return NULL;
832
David Miller869759b2011-07-25 00:01:33 +0000833 return clip_seq_vcc_walk(state, neighbour_priv(n), pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834}
835
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700836static void *clip_seq_start(struct seq_file *seq, loff_t * pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837{
Denis V. Lunevae221202008-01-10 03:52:35 -0800838 struct clip_seq_state *state = seq->private;
839 state->ns.neigh_sub_iter = clip_seq_sub_iter;
David Miller32092ec2011-07-25 00:01:41 +0000840 return neigh_seq_start(seq, pos, &arp_tbl, NEIGH_SEQ_NEIGH_ONLY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841}
842
843static int clip_seq_show(struct seq_file *seq, void *v)
844{
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700845 static char atm_arp_banner[] =
846 "IPitf TypeEncp Idle IP address ATM address\n";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847
848 if (v == SEQ_START_TOKEN) {
849 seq_puts(seq, atm_arp_banner);
850 } else {
851 struct clip_seq_state *state = seq->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 struct clip_vcc *vcc = state->vcc;
David Miller869759b2011-07-25 00:01:33 +0000853 struct neighbour *n = v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854
David Miller869759b2011-07-25 00:01:33 +0000855 atmarp_info(seq, n, neighbour_priv(n), vcc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 }
Stephen Hemmingere49e76d2006-04-14 15:59:37 -0700857 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858}
859
Philippe De Muyter56b3d972007-07-10 23:07:31 -0700860static const struct seq_operations arp_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 .start = clip_seq_start,
862 .next = neigh_seq_next,
863 .stop = neigh_seq_stop,
864 .show = clip_seq_show,
865};
866
867static int arp_seq_open(struct inode *inode, struct file *file)
868{
Denis V. Lunevae221202008-01-10 03:52:35 -0800869 return seq_open_net(inode, file, &arp_seq_ops,
870 sizeof(struct clip_seq_state));
Eric W. Biederman426b5302008-01-24 00:13:18 -0800871}
872
Arjan van de Ven9a321442007-02-12 00:55:35 -0800873static const struct file_operations arp_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 .open = arp_seq_open,
875 .read = seq_read,
876 .llseek = seq_lseek,
Denis V. Lunevae221202008-01-10 03:52:35 -0800877 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 .owner = THIS_MODULE
879};
880#endif
881
Wang Chendbee0d32008-03-23 21:45:36 -0700882static void atm_clip_exit_noproc(void);
883
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884static int __init atm_clip_init(void)
885{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 register_atm_ioctl(&clip_ioctl_ops);
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700887 register_netdevice_notifier(&clip_dev_notifier);
888 register_inetaddr_notifier(&clip_inet_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
Stephen Hemminger2d907392006-04-14 15:56:02 -0700890 setup_timer(&idle_timer, idle_timer_check, 0);
891
Adrian Bunk24781732006-07-09 12:13:18 -0700892#ifdef CONFIG_PROC_FS
893 {
894 struct proc_dir_entry *p;
895
Wang Chen16e297b2008-02-28 13:55:45 -0800896 p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops);
Wang Chendbee0d32008-03-23 21:45:36 -0700897 if (!p) {
Joe Perches99824462010-01-26 11:40:00 +0000898 pr_err("Unable to initialize /proc/net/atm/arp\n");
Wang Chendbee0d32008-03-23 21:45:36 -0700899 atm_clip_exit_noproc();
900 return -ENOMEM;
901 }
Adrian Bunk24781732006-07-09 12:13:18 -0700902 }
903#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904
905 return 0;
906}
907
Wang Chendbee0d32008-03-23 21:45:36 -0700908static void atm_clip_exit_noproc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909{
910 struct net_device *dev, *next;
911
Stephen Hemmingerf3a05922006-04-14 15:07:27 -0700912 unregister_inetaddr_notifier(&clip_inet_notifier);
913 unregister_netdevice_notifier(&clip_dev_notifier);
914
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 deregister_atm_ioctl(&clip_ioctl_ops);
916
917 /* First, stop the idle timer, so it stops banging
918 * on the table.
919 */
Stephen Hemminger2d907392006-04-14 15:56:02 -0700920 del_timer_sync(&idle_timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 dev = clip_devs;
923 while (dev) {
924 next = PRIV(dev)->next;
925 unregister_netdev(dev);
926 free_netdev(dev);
927 dev = next;
928 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929}
930
Wang Chendbee0d32008-03-23 21:45:36 -0700931static void __exit atm_clip_exit(void)
932{
933 remove_proc_entry("arp", atm_proc_root);
934
935 atm_clip_exit_noproc();
936}
937
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938module_init(atm_clip_init);
939module_exit(atm_clip_exit);
Stephen Hemminger4909e4882006-04-14 16:01:26 -0700940MODULE_AUTHOR("Werner Almesberger");
941MODULE_DESCRIPTION("Classical/IP over ATM interface");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942MODULE_LICENSE("GPL");