1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * lec.c: Lan Emulation driver
4 *
5 * Marko Kiiskila <mkiiskila@yahoo.com>
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
9
10 #include <linux/slab.h>
11 #include <linux/kernel.h>
12 #include <linux/bitops.h>
13 #include <linux/capability.h>
14
15 /* We are ethernet device */
16 #include <linux/if_ether.h>
17 #include <linux/netdevice.h>
18 #include <linux/etherdevice.h>
19 #include <net/sock.h>
20 #include <linux/skbuff.h>
21 #include <linux/ip.h>
22 #include <asm/byteorder.h>
23 #include <linux/uaccess.h>
24 #include <net/arp.h>
25 #include <net/dst.h>
26 #include <linux/proc_fs.h>
27 #include <linux/spinlock.h>
28 #include <linux/seq_file.h>
29
30 /* And atm device */
31 #include <linux/atmdev.h>
32 #include <linux/atmlec.h>
33
34 /* Proxy LEC knows about bridging */
35 #if IS_ENABLED(CONFIG_BRIDGE)
36 #include "../bridge/br_private.h"
37
38 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
39 #endif
40
41 /* Modular too */
42 #include <linux/module.h>
43 #include <linux/init.h>
44
45 /* Hardening for Spectre-v1 */
46 #include <linux/nospec.h>
47
48 #include "lec.h"
49 #include "lec_arpc.h"
50 #include "resources.h"
51
52 #define DUMP_PACKETS 0 /*
53 * 0 = None,
54 * 1 = 30 first bytes
55 * 2 = Whole packet
56 */
57
58 #define LEC_UNRES_QUE_LEN 8 /*
59 * number of tx packets to queue for a
60 * single destination while waiting for SVC
61 */
62
63 static int lec_open(struct net_device *dev);
64 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
65 struct net_device *dev);
66 static int lec_close(struct net_device *dev);
67 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
68 const unsigned char *mac_addr);
69 static int lec_arp_remove(struct lec_priv *priv,
70 struct lec_arp_table *to_remove);
71 /* LANE2 functions */
72 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
73 const u8 *tlvs, u32 sizeoftlvs);
74 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
75 u8 **tlvs, u32 *sizeoftlvs);
76 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
77 const u8 *tlvs, u32 sizeoftlvs);
78
79 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
80 unsigned long permanent);
81 static void lec_arp_check_empties(struct lec_priv *priv,
82 struct atm_vcc *vcc, struct sk_buff *skb);
83 static void lec_arp_destroy(struct lec_priv *priv);
84 static void lec_arp_init(struct lec_priv *priv);
85 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
86 const unsigned char *mac_to_find,
87 int is_rdesc,
88 struct lec_arp_table **ret_entry);
89 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
90 const unsigned char *atm_addr,
91 unsigned long remoteflag,
92 unsigned int targetless_le_arp);
93 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
94 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
95 static void lec_set_flush_tran_id(struct lec_priv *priv,
96 const unsigned char *atm_addr,
97 unsigned long tran_id);
98 static void lec_vcc_added(struct lec_priv *priv,
99 const struct atmlec_ioc *ioc_data,
100 struct atm_vcc *vcc,
101 void (*old_push)(struct atm_vcc *vcc,
102 struct sk_buff *skb));
103 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
104
105 /* must be done under lec_arp_lock */
lec_arp_hold(struct lec_arp_table * entry)106 static inline void lec_arp_hold(struct lec_arp_table *entry)
107 {
108 refcount_inc(&entry->usage);
109 }
110
lec_arp_put(struct lec_arp_table * entry)111 static inline void lec_arp_put(struct lec_arp_table *entry)
112 {
113 if (refcount_dec_and_test(&entry->usage))
114 kfree(entry);
115 }
116
117 static struct lane2_ops lane2_ops = {
118 .resolve = lane2_resolve, /* spec 3.1.3 */
119 .associate_req = lane2_associate_req, /* spec 3.1.4 */
120 .associate_indicator = NULL /* spec 3.1.5 */
121 };
122
123 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
124
125 /* Device structures */
126 static struct net_device *dev_lec[MAX_LEC_ITF];
127 static DEFINE_MUTEX(lec_mutex);
128
129 #if IS_ENABLED(CONFIG_BRIDGE)
lec_handle_bridge(struct sk_buff * skb,struct net_device * dev)130 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
131 {
132 char *buff;
133 struct lec_priv *priv;
134
135 /*
136 * Check if this is a BPDU. If so, ask zeppelin to send
137 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
138 * as the Config BPDU has
139 */
140 buff = skb->data + skb->dev->hard_header_len;
141 if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
142 struct sock *sk;
143 struct sk_buff *skb2;
144 struct atmlec_msg *mesg;
145
146 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
147 if (skb2 == NULL)
148 return;
149 skb2->len = sizeof(struct atmlec_msg);
150 mesg = (struct atmlec_msg *)skb2->data;
151 mesg->type = l_topology_change;
152 buff += 4;
153 mesg->content.normal.flag = *buff & 0x01;
154 /* 0x01 is topology change */
155
156 priv = netdev_priv(dev);
157 struct atm_vcc *vcc;
158
159 rcu_read_lock();
160 vcc = rcu_dereference(priv->lecd);
161 if (vcc) {
162 atm_force_charge(vcc, skb2->truesize);
163 sk = sk_atm(vcc);
164 skb_queue_tail(&sk->sk_receive_queue, skb2);
165 sk->sk_data_ready(sk);
166 } else {
167 dev_kfree_skb(skb2);
168 }
169 rcu_read_unlock();
170 }
171 }
172 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
173
174 /*
175 * Open/initialize the netdevice. This is called (in the current kernel)
176 * sometime after booting when the 'ifconfig' program is run.
177 *
178 * This routine should set everything up anew at each open, even
179 * registers that "should" only need to be set once at boot, so that
180 * there is non-reboot way to recover if something goes wrong.
181 */
182
lec_open(struct net_device * dev)183 static int lec_open(struct net_device *dev)
184 {
185 netif_start_queue(dev);
186
187 return 0;
188 }
189
190 static void
lec_send(struct atm_vcc * vcc,struct sk_buff * skb)191 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
192 {
193 struct net_device *dev = skb->dev;
194 unsigned int len = skb->len;
195
196 ATM_SKB(skb)->vcc = vcc;
197 atm_account_tx(vcc, skb);
198
199 if (vcc->send(vcc, skb) < 0) {
200 dev->stats.tx_dropped++;
201 return;
202 }
203
204 dev->stats.tx_packets++;
205 dev->stats.tx_bytes += len;
206 }
207
lec_tx_timeout(struct net_device * dev,unsigned int txqueue)208 static void lec_tx_timeout(struct net_device *dev, unsigned int txqueue)
209 {
210 pr_info("%s\n", dev->name);
211 netif_trans_update(dev);
212 netif_wake_queue(dev);
213 }
214
lec_start_xmit(struct sk_buff * skb,struct net_device * dev)215 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
216 struct net_device *dev)
217 {
218 struct sk_buff *skb2;
219 struct lec_priv *priv = netdev_priv(dev);
220 struct lecdatahdr_8023 *lec_h;
221 struct atm_vcc *vcc;
222 struct lec_arp_table *entry;
223 unsigned char *dst;
224 int min_frame_size;
225 int is_rdesc;
226
227 pr_debug("called\n");
228 if (!rcu_access_pointer(priv->lecd)) {
229 pr_info("%s:No lecd attached\n", dev->name);
230 dev->stats.tx_errors++;
231 netif_stop_queue(dev);
232 kfree_skb(skb);
233 return NETDEV_TX_OK;
234 }
235
236 pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
237 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
238 (long)skb_end_pointer(skb));
239 #if IS_ENABLED(CONFIG_BRIDGE)
240 if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
241 lec_handle_bridge(skb, dev);
242 #endif
243
244 /* Make sure we have room for lec_id */
245 if (skb_headroom(skb) < 2) {
246 pr_debug("reallocating skb\n");
247 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
248 if (unlikely(!skb2)) {
249 kfree_skb(skb);
250 return NETDEV_TX_OK;
251 }
252 consume_skb(skb);
253 skb = skb2;
254 }
255 skb_push(skb, 2);
256
257 /* Put le header to place */
258 lec_h = (struct lecdatahdr_8023 *)skb->data;
259 lec_h->le_header = htons(priv->lecid);
260
261 #if DUMP_PACKETS >= 2
262 #define MAX_DUMP_SKB 99
263 #elif DUMP_PACKETS >= 1
264 #define MAX_DUMP_SKB 30
265 #endif
266 #if DUMP_PACKETS >= 1
267 printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
268 dev->name, skb->len, priv->lecid);
269 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
270 skb->data, min(skb->len, MAX_DUMP_SKB), true);
271 #endif /* DUMP_PACKETS >= 1 */
272
273 /* Minimum ethernet-frame size */
274 min_frame_size = LEC_MINIMUM_8023_SIZE;
275 if (skb->len < min_frame_size) {
276 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
277 skb2 = skb_copy_expand(skb, 0,
278 min_frame_size - skb->truesize,
279 GFP_ATOMIC);
280 dev_kfree_skb(skb);
281 if (skb2 == NULL) {
282 dev->stats.tx_dropped++;
283 return NETDEV_TX_OK;
284 }
285 skb = skb2;
286 }
287 skb_put(skb, min_frame_size - skb->len);
288 }
289
290 /* Send to right vcc */
291 is_rdesc = 0;
292 dst = lec_h->h_dest;
293 entry = NULL;
294 vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
295 pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
296 dev->name, vcc, vcc ? vcc->flags : 0, entry);
297 if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
298 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
299 pr_debug("%s:queuing packet, MAC address %pM\n",
300 dev->name, lec_h->h_dest);
301 skb_queue_tail(&entry->tx_wait, skb);
302 } else {
303 pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
304 dev->name, lec_h->h_dest);
305 dev->stats.tx_dropped++;
306 dev_kfree_skb(skb);
307 }
308 goto out;
309 }
310 #if DUMP_PACKETS > 0
311 printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
312 dev->name, vcc->vpi, vcc->vci);
313 #endif /* DUMP_PACKETS > 0 */
314
315 while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
316 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
317 lec_send(vcc, skb2);
318 }
319
320 lec_send(vcc, skb);
321
322 if (!atm_may_send(vcc, 0)) {
323 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
324
325 vpriv->xoff = 1;
326 netif_stop_queue(dev);
327
328 /*
329 * vcc->pop() might have occurred in between, making
330 * the vcc usuable again. Since xmit is serialized,
331 * this is the only situation we have to re-test.
332 */
333
334 if (atm_may_send(vcc, 0))
335 netif_wake_queue(dev);
336 }
337
338 out:
339 if (entry)
340 lec_arp_put(entry);
341 netif_trans_update(dev);
342 return NETDEV_TX_OK;
343 }
344
345 /* The inverse routine to net_open(). */
lec_close(struct net_device * dev)346 static int lec_close(struct net_device *dev)
347 {
348 netif_stop_queue(dev);
349 return 0;
350 }
351
lec_atm_send(struct atm_vcc * vcc,struct sk_buff * skb)352 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
353 {
354 static const u8 zero_addr[ETH_ALEN] = {};
355 unsigned long flags;
356 struct net_device *dev = (struct net_device *)vcc->proto_data;
357 struct lec_priv *priv = netdev_priv(dev);
358 struct atmlec_msg *mesg;
359 struct lec_arp_table *entry;
360 char *tmp; /* FIXME */
361
362 WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
363 mesg = (struct atmlec_msg *)skb->data;
364 tmp = skb->data;
365 tmp += sizeof(struct atmlec_msg);
366 pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
367 switch (mesg->type) {
368 case l_set_mac_addr:
369 eth_hw_addr_set(dev, mesg->content.normal.mac_addr);
370 break;
371 case l_del_mac_addr:
372 eth_hw_addr_set(dev, zero_addr);
373 break;
374 case l_addr_delete:
375 lec_addr_delete(priv, mesg->content.normal.atm_addr,
376 mesg->content.normal.flag);
377 break;
378 case l_topology_change:
379 priv->topology_change = mesg->content.normal.flag;
380 break;
381 case l_flush_complete:
382 lec_flush_complete(priv, mesg->content.normal.flag);
383 break;
384 case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */
385 spin_lock_irqsave(&priv->lec_arp_lock, flags);
386 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
387 lec_arp_remove(priv, entry);
388 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
389
390 if (mesg->content.normal.no_source_le_narp)
391 break;
392 fallthrough;
393 case l_arp_update:
394 lec_arp_update(priv, mesg->content.normal.mac_addr,
395 mesg->content.normal.atm_addr,
396 mesg->content.normal.flag,
397 mesg->content.normal.targetless_le_arp);
398 pr_debug("in l_arp_update\n");
399 if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */
400 pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
401 mesg->sizeoftlvs);
402 lane2_associate_ind(dev, mesg->content.normal.mac_addr,
403 tmp, mesg->sizeoftlvs);
404 }
405 break;
406 case l_config:
407 priv->maximum_unknown_frame_count =
408 mesg->content.config.maximum_unknown_frame_count;
409 priv->max_unknown_frame_time =
410 (mesg->content.config.max_unknown_frame_time * HZ);
411 priv->max_retry_count = mesg->content.config.max_retry_count;
412 priv->aging_time = (mesg->content.config.aging_time * HZ);
413 priv->forward_delay_time =
414 (mesg->content.config.forward_delay_time * HZ);
415 priv->arp_response_time =
416 (mesg->content.config.arp_response_time * HZ);
417 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
418 priv->path_switching_delay =
419 (mesg->content.config.path_switching_delay * HZ);
420 priv->lane_version = mesg->content.config.lane_version;
421 /* LANE2 */
422 priv->lane2_ops = NULL;
423 if (priv->lane_version > 1)
424 priv->lane2_ops = &lane2_ops;
425 rtnl_lock();
426 if (dev_set_mtu(dev, mesg->content.config.mtu))
427 pr_info("%s: change_mtu to %d failed\n",
428 dev->name, mesg->content.config.mtu);
429 rtnl_unlock();
430 priv->is_proxy = mesg->content.config.is_proxy;
431 break;
432 case l_flush_tran_id:
433 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
434 mesg->content.normal.flag);
435 break;
436 case l_set_lecid:
437 priv->lecid =
438 (unsigned short)(0xffff & mesg->content.normal.flag);
439 break;
440 case l_should_bridge:
441 #if IS_ENABLED(CONFIG_BRIDGE)
442 {
443 pr_debug("%s: bridge zeppelin asks about %pM\n",
444 dev->name, mesg->content.proxy.mac_addr);
445
446 if (br_fdb_test_addr_hook == NULL)
447 break;
448
449 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
450 /* hit from bridge table, send LE_ARP_RESPONSE */
451 struct sk_buff *skb2;
452 struct sock *sk;
453
454 pr_debug("%s: entry found, responding to zeppelin\n",
455 dev->name);
456 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
457 if (skb2 == NULL)
458 break;
459 skb2->len = sizeof(struct atmlec_msg);
460 skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
461 struct atm_vcc *vcc;
462
463 rcu_read_lock();
464 vcc = rcu_dereference(priv->lecd);
465 if (vcc) {
466 atm_force_charge(vcc, skb2->truesize);
467 sk = sk_atm(vcc);
468 skb_queue_tail(&sk->sk_receive_queue, skb2);
469 sk->sk_data_ready(sk);
470 } else {
471 dev_kfree_skb(skb2);
472 }
473 rcu_read_unlock();
474 }
475 }
476 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
477 break;
478 default:
479 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
480 dev_kfree_skb(skb);
481 return -EINVAL;
482 }
483 dev_kfree_skb(skb);
484 return 0;
485 }
486
lec_atm_close(struct atm_vcc * vcc)487 static void lec_atm_close(struct atm_vcc *vcc)
488 {
489 struct net_device *dev = (struct net_device *)vcc->proto_data;
490 struct lec_priv *priv = netdev_priv(dev);
491
492 rcu_assign_pointer(priv->lecd, NULL);
493 synchronize_rcu();
494 /* Do something needful? */
495
496 netif_stop_queue(dev);
497 lec_arp_destroy(priv);
498
499 pr_info("%s: Shut down!\n", dev->name);
500 module_put(THIS_MODULE);
501 }
502
503 static const struct atmdev_ops lecdev_ops = {
504 .close = lec_atm_close,
505 .send = lec_atm_send
506 };
507
508 static struct atm_dev lecatm_dev = {
509 .ops = &lecdev_ops,
510 .type = "lec",
511 .number = 999, /* dummy device number */
512 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
513 };
514
515 /*
516 * LANE2: new argument struct sk_buff *data contains
517 * the LE_ARP based TLVs introduced in the LANE2 spec
518 */
519 static int
send_to_lecd(struct lec_priv * priv,atmlec_msg_type type,const unsigned char * mac_addr,const unsigned char * atm_addr,struct sk_buff * data)520 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
521 const unsigned char *mac_addr, const unsigned char *atm_addr,
522 struct sk_buff *data)
523 {
524 struct atm_vcc *vcc;
525 struct sock *sk;
526 struct sk_buff *skb;
527 struct atmlec_msg *mesg;
528
529 if (!priv || !rcu_access_pointer(priv->lecd))
530 return -1;
531
532 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
533 if (!skb)
534 return -1;
535 skb->len = sizeof(struct atmlec_msg);
536 mesg = (struct atmlec_msg *)skb->data;
537 memset(mesg, 0, sizeof(struct atmlec_msg));
538 mesg->type = type;
539 if (data != NULL)
540 mesg->sizeoftlvs = data->len;
541 if (mac_addr)
542 ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
543 else
544 mesg->content.normal.targetless_le_arp = 1;
545 if (atm_addr)
546 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
547
548 rcu_read_lock();
549 vcc = rcu_dereference(priv->lecd);
550 if (!vcc) {
551 rcu_read_unlock();
552 kfree_skb(skb);
553 return -1;
554 }
555
556 atm_force_charge(vcc, skb->truesize);
557 sk = sk_atm(vcc);
558 skb_queue_tail(&sk->sk_receive_queue, skb);
559 sk->sk_data_ready(sk);
560
561 if (data != NULL) {
562 pr_debug("about to send %d bytes of data\n", data->len);
563 atm_force_charge(vcc, data->truesize);
564 skb_queue_tail(&sk->sk_receive_queue, data);
565 sk->sk_data_ready(sk);
566 }
567
568 rcu_read_unlock();
569 return 0;
570 }
571
lec_set_multicast_list(struct net_device * dev)572 static void lec_set_multicast_list(struct net_device *dev)
573 {
574 /*
575 * by default, all multicast frames arrive over the bus.
576 * eventually support selective multicast service
577 */
578 }
579
580 static const struct net_device_ops lec_netdev_ops = {
581 .ndo_open = lec_open,
582 .ndo_stop = lec_close,
583 .ndo_start_xmit = lec_start_xmit,
584 .ndo_tx_timeout = lec_tx_timeout,
585 .ndo_set_rx_mode = lec_set_multicast_list,
586 };
587
588 static const unsigned char lec_ctrl_magic[] = {
589 0xff,
590 0x00,
591 0x01,
592 0x01
593 };
594
595 #define LEC_DATA_DIRECT_8023 2
596 #define LEC_DATA_DIRECT_8025 3
597
lec_is_data_direct(struct atm_vcc * vcc)598 static int lec_is_data_direct(struct atm_vcc *vcc)
599 {
600 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
601 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
602 }
603
lec_push(struct atm_vcc * vcc,struct sk_buff * skb)604 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
605 {
606 unsigned long flags;
607 struct net_device *dev = (struct net_device *)vcc->proto_data;
608 struct lec_priv *priv = netdev_priv(dev);
609
610 #if DUMP_PACKETS > 0
611 printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
612 dev->name, vcc->vpi, vcc->vci);
613 #endif
614 if (!skb) {
615 pr_debug("%s: null skb\n", dev->name);
616 lec_vcc_close(priv, vcc);
617 return;
618 }
619 #if DUMP_PACKETS >= 2
620 #define MAX_SKB_DUMP 99
621 #elif DUMP_PACKETS >= 1
622 #define MAX_SKB_DUMP 30
623 #endif
624 #if DUMP_PACKETS > 0
625 printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
626 dev->name, skb->len, priv->lecid);
627 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
628 skb->data, min(MAX_SKB_DUMP, skb->len), true);
629 #endif /* DUMP_PACKETS > 0 */
630 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
631 /* Control frame, to daemon */
632 struct sock *sk = sk_atm(vcc);
633
634 pr_debug("%s: To daemon\n", dev->name);
635 skb_queue_tail(&sk->sk_receive_queue, skb);
636 sk->sk_data_ready(sk);
637 } else { /* Data frame, queue to protocol handlers */
638 struct lec_arp_table *entry;
639 unsigned char *src, *dst;
640
641 atm_return(vcc, skb->truesize);
642 if (*(__be16 *) skb->data == htons(priv->lecid) ||
643 !rcu_access_pointer(priv->lecd) || !(dev->flags & IFF_UP)) {
644 /*
645 * Probably looping back, or if lecd is missing,
646 * lecd has gone down
647 */
648 pr_debug("Ignoring frame...\n");
649 dev_kfree_skb(skb);
650 return;
651 }
652 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
653
654 /*
655 * If this is a Data Direct VCC, and the VCC does not match
656 * the LE_ARP cache entry, delete the LE_ARP cache entry.
657 */
658 spin_lock_irqsave(&priv->lec_arp_lock, flags);
659 if (lec_is_data_direct(vcc)) {
660 src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
661 entry = lec_arp_find(priv, src);
662 if (entry && entry->vcc != vcc) {
663 lec_arp_remove(priv, entry);
664 lec_arp_put(entry);
665 }
666 }
667 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
668
669 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
670 !priv->is_proxy && /* Proxy wants all the packets */
671 memcmp(dst, dev->dev_addr, dev->addr_len)) {
672 dev_kfree_skb(skb);
673 return;
674 }
675 if (!hlist_empty(&priv->lec_arp_empty_ones))
676 lec_arp_check_empties(priv, vcc, skb);
677 skb_pull(skb, 2); /* skip lec_id */
678 skb->protocol = eth_type_trans(skb, dev);
679 dev->stats.rx_packets++;
680 dev->stats.rx_bytes += skb->len;
681 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
682 netif_rx(skb);
683 }
684 }
685
lec_pop(struct atm_vcc * vcc,struct sk_buff * skb)686 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
687 {
688 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
689 struct net_device *dev = skb->dev;
690
691 if (vpriv == NULL) {
692 pr_info("vpriv = NULL!?!?!?\n");
693 return;
694 }
695
696 vpriv->old_pop(vcc, skb);
697
698 if (vpriv->xoff && atm_may_send(vcc, 0)) {
699 vpriv->xoff = 0;
700 if (netif_running(dev) && netif_queue_stopped(dev))
701 netif_wake_queue(dev);
702 }
703 }
704
lec_vcc_attach(struct atm_vcc * vcc,void __user * arg)705 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
706 {
707 struct lec_vcc_priv *vpriv;
708 int bytes_left;
709 struct atmlec_ioc ioc_data;
710
711 lockdep_assert_held(&lec_mutex);
712 /* Lecd must be up in this case */
713 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
714 if (bytes_left != 0)
715 pr_info("copy from user failed for %d bytes\n", bytes_left);
716 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
717 return -EINVAL;
718 ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF);
719 if (!dev_lec[ioc_data.dev_num])
720 return -EINVAL;
721 vpriv = kmalloc_obj(struct lec_vcc_priv);
722 if (!vpriv)
723 return -ENOMEM;
724 vpriv->xoff = 0;
725 vpriv->old_pop = vcc->pop;
726 vcc->user_back = vpriv;
727 vcc->pop = lec_pop;
728 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
729 &ioc_data, vcc, vcc->push);
730 vcc->proto_data = dev_lec[ioc_data.dev_num];
731 vcc->push = lec_push;
732 return 0;
733 }
734
lec_mcast_attach(struct atm_vcc * vcc,int arg)735 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
736 {
737 lockdep_assert_held(&lec_mutex);
738 if (arg < 0 || arg >= MAX_LEC_ITF)
739 return -EINVAL;
740 arg = array_index_nospec(arg, MAX_LEC_ITF);
741 if (!dev_lec[arg])
742 return -EINVAL;
743 vcc->proto_data = dev_lec[arg];
744 return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
745 }
746
747 /* Initialize device. */
lecd_attach(struct atm_vcc * vcc,int arg)748 static int lecd_attach(struct atm_vcc *vcc, int arg)
749 {
750 int i;
751 struct lec_priv *priv;
752
753 lockdep_assert_held(&lec_mutex);
754 if (arg < 0)
755 arg = 0;
756 if (arg >= MAX_LEC_ITF)
757 return -EINVAL;
758 i = array_index_nospec(arg, MAX_LEC_ITF);
759 if (!dev_lec[i]) {
760 int size;
761
762 size = sizeof(struct lec_priv);
763 dev_lec[i] = alloc_etherdev(size);
764 if (!dev_lec[i])
765 return -ENOMEM;
766 dev_lec[i]->netdev_ops = &lec_netdev_ops;
767 dev_lec[i]->max_mtu = 18190;
768 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
769 if (register_netdev(dev_lec[i])) {
770 free_netdev(dev_lec[i]);
771 dev_lec[i] = NULL;
772 return -EINVAL;
773 }
774
775 priv = netdev_priv(dev_lec[i]);
776 } else {
777 priv = netdev_priv(dev_lec[i]);
778 if (rcu_access_pointer(priv->lecd))
779 return -EADDRINUSE;
780 }
781 lec_arp_init(priv);
782 priv->itfnum = i; /* LANE2 addition */
783 rcu_assign_pointer(priv->lecd, vcc);
784 vcc->dev = &lecatm_dev;
785 vcc_insert_socket(sk_atm(vcc));
786
787 vcc->proto_data = dev_lec[i];
788 set_bit(ATM_VF_META, &vcc->flags);
789 set_bit(ATM_VF_READY, &vcc->flags);
790
791 /* Set default values to these variables */
792 priv->maximum_unknown_frame_count = 1;
793 priv->max_unknown_frame_time = (1 * HZ);
794 priv->vcc_timeout_period = (1200 * HZ);
795 priv->max_retry_count = 1;
796 priv->aging_time = (300 * HZ);
797 priv->forward_delay_time = (15 * HZ);
798 priv->topology_change = 0;
799 priv->arp_response_time = (1 * HZ);
800 priv->flush_timeout = (4 * HZ);
801 priv->path_switching_delay = (6 * HZ);
802
803 if (dev_lec[i]->flags & IFF_UP)
804 netif_start_queue(dev_lec[i]);
805 __module_get(THIS_MODULE);
806 return i;
807 }
808
809 #ifdef CONFIG_PROC_FS
lec_arp_get_status_string(unsigned char status)810 static const char *lec_arp_get_status_string(unsigned char status)
811 {
812 static const char *const lec_arp_status_string[] = {
813 "ESI_UNKNOWN ",
814 "ESI_ARP_PENDING ",
815 "ESI_VC_PENDING ",
816 "<Undefined> ",
817 "ESI_FLUSH_PENDING ",
818 "ESI_FORWARD_DIRECT"
819 };
820
821 if (status > ESI_FORWARD_DIRECT)
822 status = 3; /* ESI_UNDEFINED */
823 return lec_arp_status_string[status];
824 }
825
lec_info(struct seq_file * seq,struct lec_arp_table * entry)826 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
827 {
828 seq_printf(seq, "%pM ", entry->mac_addr);
829 seq_printf(seq, "%*phN ", ATM_ESA_LEN, entry->atm_addr);
830 seq_printf(seq, "%s %4.4x", lec_arp_get_status_string(entry->status),
831 entry->flags & 0xffff);
832 if (entry->vcc)
833 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
834 else
835 seq_printf(seq, " ");
836 if (entry->recv_vcc) {
837 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi,
838 entry->recv_vcc->vci);
839 }
840 seq_putc(seq, '\n');
841 }
842
843 struct lec_state {
844 unsigned long flags;
845 struct lec_priv *locked;
846 struct hlist_node *node;
847 struct net_device *dev;
848 int itf;
849 int arp_table;
850 int misc_table;
851 };
852
lec_tbl_walk(struct lec_state * state,struct hlist_head * tbl,loff_t * l)853 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
854 loff_t *l)
855 {
856 struct hlist_node *e = state->node;
857
858 if (!e)
859 e = tbl->first;
860 if (e == SEQ_START_TOKEN) {
861 e = tbl->first;
862 --*l;
863 }
864
865 for (; e; e = e->next) {
866 if (--*l < 0)
867 break;
868 }
869 state->node = e;
870
871 return (*l < 0) ? state : NULL;
872 }
873
lec_arp_walk(struct lec_state * state,loff_t * l,struct lec_priv * priv)874 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
875 struct lec_priv *priv)
876 {
877 void *v = NULL;
878 int p;
879
880 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
881 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
882 if (v)
883 break;
884 }
885 state->arp_table = p;
886 return v;
887 }
888
lec_misc_walk(struct lec_state * state,loff_t * l,struct lec_priv * priv)889 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
890 struct lec_priv *priv)
891 {
892 struct hlist_head *lec_misc_tables[] = {
893 &priv->lec_arp_empty_ones,
894 &priv->lec_no_forward,
895 &priv->mcast_fwds
896 };
897 void *v = NULL;
898 int q;
899
900 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
901 v = lec_tbl_walk(state, lec_misc_tables[q], l);
902 if (v)
903 break;
904 }
905 state->misc_table = q;
906 return v;
907 }
908
lec_priv_walk(struct lec_state * state,loff_t * l,struct lec_priv * priv)909 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
910 struct lec_priv *priv)
911 {
912 if (!state->locked) {
913 state->locked = priv;
914 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
915 }
916 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
917 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
918 state->locked = NULL;
919 /* Partial state reset for the next time we get called */
920 state->arp_table = state->misc_table = 0;
921 }
922 return state->locked;
923 }
924
lec_itf_walk(struct lec_state * state,loff_t * l)925 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
926 {
927 struct net_device *dev;
928 void *v;
929
930 dev = state->dev ? state->dev : dev_lec[state->itf];
931 v = (dev && netdev_priv(dev)) ?
932 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
933 if (!v && dev) {
934 /* Partial state reset for the next time we get called */
935 dev = NULL;
936 }
937 state->dev = dev;
938 return v;
939 }
940
lec_get_idx(struct lec_state * state,loff_t l)941 static void *lec_get_idx(struct lec_state *state, loff_t l)
942 {
943 void *v = NULL;
944
945 for (; state->itf < MAX_LEC_ITF; state->itf++) {
946 v = lec_itf_walk(state, &l);
947 if (v)
948 break;
949 }
950 return v;
951 }
952
lec_seq_start(struct seq_file * seq,loff_t * pos)953 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
954 {
955 struct lec_state *state = seq->private;
956
957 mutex_lock(&lec_mutex);
958 state->itf = 0;
959 state->dev = NULL;
960 state->locked = NULL;
961 state->arp_table = 0;
962 state->misc_table = 0;
963 state->node = SEQ_START_TOKEN;
964
965 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
966 }
967
lec_seq_stop(struct seq_file * seq,void * v)968 static void lec_seq_stop(struct seq_file *seq, void *v)
969 {
970 struct lec_state *state = seq->private;
971
972 if (state->dev) {
973 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
974 state->flags);
975 state->dev = NULL;
976 }
977 mutex_unlock(&lec_mutex);
978 }
979
lec_seq_next(struct seq_file * seq,void * v,loff_t * pos)980 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
981 {
982 struct lec_state *state = seq->private;
983
984 ++*pos;
985 return lec_get_idx(state, 1);
986 }
987
lec_seq_show(struct seq_file * seq,void * v)988 static int lec_seq_show(struct seq_file *seq, void *v)
989 {
990 static const char lec_banner[] =
991 "Itf MAC ATM destination"
992 " Status Flags "
993 "VPI/VCI Recv VPI/VCI\n";
994
995 if (v == SEQ_START_TOKEN)
996 seq_puts(seq, lec_banner);
997 else {
998 struct lec_state *state = seq->private;
999 struct net_device *dev = state->dev;
1000 struct lec_arp_table *entry = hlist_entry(state->node,
1001 struct lec_arp_table,
1002 next);
1003
1004 seq_printf(seq, "%s ", dev->name);
1005 lec_info(seq, entry);
1006 }
1007 return 0;
1008 }
1009
1010 static const struct seq_operations lec_seq_ops = {
1011 .start = lec_seq_start,
1012 .next = lec_seq_next,
1013 .stop = lec_seq_stop,
1014 .show = lec_seq_show,
1015 };
1016 #endif
1017
lane_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1018 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1019 {
1020 struct atm_vcc *vcc = ATM_SD(sock);
1021 int err = 0;
1022
1023 switch (cmd) {
1024 case ATMLEC_CTRL:
1025 case ATMLEC_MCAST:
1026 case ATMLEC_DATA:
1027 if (!capable(CAP_NET_ADMIN))
1028 return -EPERM;
1029 break;
1030 default:
1031 return -ENOIOCTLCMD;
1032 }
1033
1034 mutex_lock(&lec_mutex);
1035 switch (cmd) {
1036 case ATMLEC_CTRL:
1037 err = lecd_attach(vcc, (int)arg);
1038 if (err >= 0)
1039 sock->state = SS_CONNECTED;
1040 break;
1041 case ATMLEC_MCAST:
1042 err = lec_mcast_attach(vcc, (int)arg);
1043 break;
1044 case ATMLEC_DATA:
1045 err = lec_vcc_attach(vcc, (void __user *)arg);
1046 break;
1047 }
1048
1049 mutex_unlock(&lec_mutex);
1050 return err;
1051 }
1052
1053 static struct atm_ioctl lane_ioctl_ops = {
1054 .owner = THIS_MODULE,
1055 .ioctl = lane_ioctl,
1056 };
1057
lane_module_init(void)1058 static int __init lane_module_init(void)
1059 {
1060 #ifdef CONFIG_PROC_FS
1061 struct proc_dir_entry *p;
1062
1063 p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops,
1064 sizeof(struct lec_state), NULL);
1065 if (!p) {
1066 pr_err("Unable to initialize /proc/net/atm/lec\n");
1067 return -ENOMEM;
1068 }
1069 #endif
1070
1071 register_atm_ioctl(&lane_ioctl_ops);
1072 pr_info("lec.c: initialized\n");
1073 return 0;
1074 }
1075
lane_module_cleanup(void)1076 static void __exit lane_module_cleanup(void)
1077 {
1078 int i;
1079
1080 #ifdef CONFIG_PROC_FS
1081 remove_proc_entry("lec", atm_proc_root);
1082 #endif
1083
1084 deregister_atm_ioctl(&lane_ioctl_ops);
1085
1086 for (i = 0; i < MAX_LEC_ITF; i++) {
1087 if (dev_lec[i] != NULL) {
1088 unregister_netdev(dev_lec[i]);
1089 free_netdev(dev_lec[i]);
1090 dev_lec[i] = NULL;
1091 }
1092 }
1093 }
1094
1095 module_init(lane_module_init);
1096 module_exit(lane_module_cleanup);
1097
1098 /*
1099 * LANE2: 3.1.3, LE_RESOLVE.request
1100 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1101 * If sizeoftlvs == NULL the default TLVs associated with this
1102 * lec will be used.
1103 * If dst_mac == NULL, targetless LE_ARP will be sent
1104 */
lane2_resolve(struct net_device * dev,const u8 * dst_mac,int force,u8 ** tlvs,u32 * sizeoftlvs)1105 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1106 u8 **tlvs, u32 *sizeoftlvs)
1107 {
1108 unsigned long flags;
1109 struct lec_priv *priv = netdev_priv(dev);
1110 struct lec_arp_table *table;
1111 struct sk_buff *skb;
1112 int retval;
1113
1114 if (force == 0) {
1115 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1116 table = lec_arp_find(priv, dst_mac);
1117 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1118 if (table == NULL)
1119 return -1;
1120
1121 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1122 if (*tlvs == NULL)
1123 return -1;
1124
1125 *sizeoftlvs = table->sizeoftlvs;
1126
1127 return 0;
1128 }
1129
1130 if (sizeoftlvs == NULL)
1131 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1132
1133 else {
1134 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1135 if (skb == NULL)
1136 return -1;
1137 skb->len = *sizeoftlvs;
1138 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1139 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1140 }
1141 return retval;
1142 }
1143
1144 /*
1145 * LANE2: 3.1.4, LE_ASSOCIATE.request
1146 * Associate the *tlvs with the *lan_dst address.
1147 * Will overwrite any previous association
1148 * Returns 1 for success, 0 for failure (out of memory)
1149 *
1150 */
lane2_associate_req(struct net_device * dev,const u8 * lan_dst,const u8 * tlvs,u32 sizeoftlvs)1151 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1152 const u8 *tlvs, u32 sizeoftlvs)
1153 {
1154 int retval;
1155 struct sk_buff *skb;
1156 struct lec_priv *priv = netdev_priv(dev);
1157
1158 if (!ether_addr_equal(lan_dst, dev->dev_addr))
1159 return 0; /* not our mac address */
1160
1161 kfree(priv->tlvs); /* NULL if there was no previous association */
1162
1163 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1164 if (priv->tlvs == NULL)
1165 return 0;
1166 priv->sizeoftlvs = sizeoftlvs;
1167
1168 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1169 if (skb == NULL)
1170 return 0;
1171 skb->len = sizeoftlvs;
1172 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1173 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1174 if (retval != 0)
1175 pr_info("lec.c: lane2_associate_req() failed\n");
1176 /*
1177 * If the previous association has changed we must
1178 * somehow notify other LANE entities about the change
1179 */
1180 return 1;
1181 }
1182
1183 /*
1184 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1185 *
1186 */
lane2_associate_ind(struct net_device * dev,const u8 * mac_addr,const u8 * tlvs,u32 sizeoftlvs)1187 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1188 const u8 *tlvs, u32 sizeoftlvs)
1189 {
1190 #if 0
1191 int i = 0;
1192 #endif
1193 struct lec_priv *priv = netdev_priv(dev);
1194 #if 0 /*
1195 * Why have the TLVs in LE_ARP entries
1196 * since we do not use them? When you
1197 * uncomment this code, make sure the
1198 * TLVs get freed when entry is killed
1199 */
1200 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1201
1202 if (entry == NULL)
1203 return; /* should not happen */
1204
1205 kfree(entry->tlvs);
1206
1207 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1208 if (entry->tlvs == NULL)
1209 return;
1210 entry->sizeoftlvs = sizeoftlvs;
1211 #endif
1212 #if 0
1213 pr_info("\n");
1214 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1215 while (i < sizeoftlvs)
1216 pr_cont("%02x ", tlvs[i++]);
1217
1218 pr_cont("\n");
1219 #endif
1220
1221 /* tell MPOA about the TLVs we saw */
1222 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1223 priv->lane2_ops->associate_indicator(dev, mac_addr,
1224 tlvs, sizeoftlvs);
1225 }
1226 }
1227
1228 /*
1229 * Here starts what used to lec_arpc.c
1230 *
1231 * lec_arpc.c was added here when making
1232 * lane client modular. October 1997
1233 */
1234
1235 #include <linux/types.h>
1236 #include <linux/timer.h>
1237 #include <linux/param.h>
1238 #include <linux/atomic.h>
1239 #include <linux/inetdevice.h>
1240 #include <net/route.h>
1241
1242 #if 0
1243 #define pr_debug(format, args...)
1244 /*
1245 #define pr_debug printk
1246 */
1247 #endif
1248 #define DEBUG_ARP_TABLE 0
1249
1250 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1251
1252 static void lec_arp_check_expire(struct work_struct *work);
1253 static void lec_arp_expire_arp(struct timer_list *t);
1254
1255 /*
1256 * Arp table funcs
1257 */
1258
1259 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1260
1261 /*
1262 * Initialization of arp-cache
1263 */
lec_arp_init(struct lec_priv * priv)1264 static void lec_arp_init(struct lec_priv *priv)
1265 {
1266 unsigned short i;
1267
1268 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1269 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1270 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1271 INIT_HLIST_HEAD(&priv->lec_no_forward);
1272 INIT_HLIST_HEAD(&priv->mcast_fwds);
1273 spin_lock_init(&priv->lec_arp_lock);
1274 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1275 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1276 }
1277
lec_arp_clear_vccs(struct lec_arp_table * entry)1278 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1279 {
1280 if (entry->vcc) {
1281 struct atm_vcc *vcc = entry->vcc;
1282 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1283 struct net_device *dev = (struct net_device *)vcc->proto_data;
1284
1285 if (vpriv) {
1286 vcc->pop = vpriv->old_pop;
1287 if (vpriv->xoff)
1288 netif_wake_queue(dev);
1289 kfree(vpriv);
1290 vcc->user_back = NULL;
1291 vcc->push = entry->old_push;
1292 vcc_release_async(vcc, -EPIPE);
1293 }
1294 entry->vcc = NULL;
1295 }
1296 if (entry->recv_vcc) {
1297 struct atm_vcc *vcc = entry->recv_vcc;
1298 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1299
1300 if (vpriv) {
1301 kfree(vpriv);
1302 vcc->user_back = NULL;
1303
1304 entry->recv_vcc->push = entry->old_recv_push;
1305 vcc_release_async(entry->recv_vcc, -EPIPE);
1306 }
1307 entry->recv_vcc = NULL;
1308 }
1309 }
1310
1311 /*
1312 * Insert entry to lec_arp_table
1313 * LANE2: Add to the end of the list to satisfy 8.1.13
1314 */
1315 static inline void
lec_arp_add(struct lec_priv * priv,struct lec_arp_table * entry)1316 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1317 {
1318 struct hlist_head *tmp;
1319
1320 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1321 hlist_add_head(&entry->next, tmp);
1322
1323 pr_debug("Added entry:%pM\n", entry->mac_addr);
1324 }
1325
1326 /*
1327 * Remove entry from lec_arp_table
1328 */
1329 static int
lec_arp_remove(struct lec_priv * priv,struct lec_arp_table * to_remove)1330 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1331 {
1332 struct lec_arp_table *entry;
1333 int i, remove_vcc = 1;
1334
1335 if (!to_remove)
1336 return -1;
1337
1338 hlist_del(&to_remove->next);
1339 timer_delete(&to_remove->timer);
1340
1341 /*
1342 * If this is the only MAC connected to this VCC,
1343 * also tear down the VCC
1344 */
1345 if (to_remove->status >= ESI_FLUSH_PENDING) {
1346 /*
1347 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1348 */
1349 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1350 hlist_for_each_entry(entry,
1351 &priv->lec_arp_tables[i], next) {
1352 if (memcmp(to_remove->atm_addr,
1353 entry->atm_addr, ATM_ESA_LEN) == 0) {
1354 remove_vcc = 0;
1355 break;
1356 }
1357 }
1358 }
1359 if (remove_vcc)
1360 lec_arp_clear_vccs(to_remove);
1361 }
1362 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */
1363
1364 pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1365 return 0;
1366 }
1367
1368 #if DEBUG_ARP_TABLE
get_status_string(unsigned char st)1369 static const char *get_status_string(unsigned char st)
1370 {
1371 switch (st) {
1372 case ESI_UNKNOWN:
1373 return "ESI_UNKNOWN";
1374 case ESI_ARP_PENDING:
1375 return "ESI_ARP_PENDING";
1376 case ESI_VC_PENDING:
1377 return "ESI_VC_PENDING";
1378 case ESI_FLUSH_PENDING:
1379 return "ESI_FLUSH_PENDING";
1380 case ESI_FORWARD_DIRECT:
1381 return "ESI_FORWARD_DIRECT";
1382 }
1383 return "<UNKNOWN>";
1384 }
1385
dump_arp_table(struct lec_priv * priv)1386 static void dump_arp_table(struct lec_priv *priv)
1387 {
1388 struct lec_arp_table *rulla;
1389 char buf[256];
1390 int i, offset;
1391
1392 pr_info("Dump %p:\n", priv);
1393 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1394 hlist_for_each_entry(rulla,
1395 &priv->lec_arp_tables[i], next) {
1396 offset = 0;
1397 offset += sprintf(buf, "%d: %p\n", i, rulla);
1398 offset += sprintf(buf + offset, "Mac: %pM ",
1399 rulla->mac_addr);
1400 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1401 rulla->atm_addr);
1402 offset += sprintf(buf + offset,
1403 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1404 rulla->vcc ? rulla->vcc->vpi : 0,
1405 rulla->vcc ? rulla->vcc->vci : 0,
1406 rulla->recv_vcc ? rulla->recv_vcc->
1407 vpi : 0,
1408 rulla->recv_vcc ? rulla->recv_vcc->
1409 vci : 0, rulla->last_used,
1410 rulla->timestamp, rulla->no_tries);
1411 offset +=
1412 sprintf(buf + offset,
1413 "Flags:%x, Packets_flooded:%x, Status: %s ",
1414 rulla->flags, rulla->packets_flooded,
1415 get_status_string(rulla->status));
1416 pr_info("%s\n", buf);
1417 }
1418 }
1419
1420 if (!hlist_empty(&priv->lec_no_forward))
1421 pr_info("No forward\n");
1422 hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1423 offset = 0;
1424 offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1425 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1426 rulla->atm_addr);
1427 offset += sprintf(buf + offset,
1428 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1429 rulla->vcc ? rulla->vcc->vpi : 0,
1430 rulla->vcc ? rulla->vcc->vci : 0,
1431 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1432 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1433 rulla->last_used,
1434 rulla->timestamp, rulla->no_tries);
1435 offset += sprintf(buf + offset,
1436 "Flags:%x, Packets_flooded:%x, Status: %s ",
1437 rulla->flags, rulla->packets_flooded,
1438 get_status_string(rulla->status));
1439 pr_info("%s\n", buf);
1440 }
1441
1442 if (!hlist_empty(&priv->lec_arp_empty_ones))
1443 pr_info("Empty ones\n");
1444 hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1445 offset = 0;
1446 offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1447 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1448 rulla->atm_addr);
1449 offset += sprintf(buf + offset,
1450 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1451 rulla->vcc ? rulla->vcc->vpi : 0,
1452 rulla->vcc ? rulla->vcc->vci : 0,
1453 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1454 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1455 rulla->last_used,
1456 rulla->timestamp, rulla->no_tries);
1457 offset += sprintf(buf + offset,
1458 "Flags:%x, Packets_flooded:%x, Status: %s ",
1459 rulla->flags, rulla->packets_flooded,
1460 get_status_string(rulla->status));
1461 pr_info("%s", buf);
1462 }
1463
1464 if (!hlist_empty(&priv->mcast_fwds))
1465 pr_info("Multicast Forward VCCs\n");
1466 hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1467 offset = 0;
1468 offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1469 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1470 rulla->atm_addr);
1471 offset += sprintf(buf + offset,
1472 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1473 rulla->vcc ? rulla->vcc->vpi : 0,
1474 rulla->vcc ? rulla->vcc->vci : 0,
1475 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1476 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1477 rulla->last_used,
1478 rulla->timestamp, rulla->no_tries);
1479 offset += sprintf(buf + offset,
1480 "Flags:%x, Packets_flooded:%x, Status: %s ",
1481 rulla->flags, rulla->packets_flooded,
1482 get_status_string(rulla->status));
1483 pr_info("%s\n", buf);
1484 }
1485
1486 }
1487 #else
1488 #define dump_arp_table(priv) do { } while (0)
1489 #endif
1490
1491 /*
1492 * Destruction of arp-cache
1493 */
lec_arp_destroy(struct lec_priv * priv)1494 static void lec_arp_destroy(struct lec_priv *priv)
1495 {
1496 unsigned long flags;
1497 struct hlist_node *next;
1498 struct lec_arp_table *entry;
1499 int i;
1500
1501 cancel_delayed_work_sync(&priv->lec_arp_work);
1502
1503 /*
1504 * Remove all entries
1505 */
1506
1507 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1508 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1509 hlist_for_each_entry_safe(entry, next,
1510 &priv->lec_arp_tables[i], next) {
1511 lec_arp_remove(priv, entry);
1512 lec_arp_put(entry);
1513 }
1514 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1515 }
1516
1517 hlist_for_each_entry_safe(entry, next,
1518 &priv->lec_arp_empty_ones, next) {
1519 timer_delete_sync(&entry->timer);
1520 lec_arp_clear_vccs(entry);
1521 hlist_del(&entry->next);
1522 lec_arp_put(entry);
1523 }
1524 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1525
1526 hlist_for_each_entry_safe(entry, next,
1527 &priv->lec_no_forward, next) {
1528 timer_delete_sync(&entry->timer);
1529 lec_arp_clear_vccs(entry);
1530 hlist_del(&entry->next);
1531 lec_arp_put(entry);
1532 }
1533 INIT_HLIST_HEAD(&priv->lec_no_forward);
1534
1535 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1536 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1537 lec_arp_clear_vccs(entry);
1538 hlist_del(&entry->next);
1539 lec_arp_put(entry);
1540 }
1541 INIT_HLIST_HEAD(&priv->mcast_fwds);
1542 priv->mcast_vcc = NULL;
1543 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1544 }
1545
1546 /*
1547 * Find entry by mac_address
1548 */
lec_arp_find(struct lec_priv * priv,const unsigned char * mac_addr)1549 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1550 const unsigned char *mac_addr)
1551 {
1552 struct hlist_head *head;
1553 struct lec_arp_table *entry;
1554
1555 pr_debug("%pM\n", mac_addr);
1556
1557 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1558 hlist_for_each_entry(entry, head, next) {
1559 if (ether_addr_equal(mac_addr, entry->mac_addr))
1560 return entry;
1561 }
1562 return NULL;
1563 }
1564
make_entry(struct lec_priv * priv,const unsigned char * mac_addr)1565 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1566 const unsigned char *mac_addr)
1567 {
1568 struct lec_arp_table *to_return;
1569
1570 to_return = kzalloc_obj(struct lec_arp_table, GFP_ATOMIC);
1571 if (!to_return)
1572 return NULL;
1573 ether_addr_copy(to_return->mac_addr, mac_addr);
1574 INIT_HLIST_NODE(&to_return->next);
1575 timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
1576 to_return->last_used = jiffies;
1577 to_return->priv = priv;
1578 skb_queue_head_init(&to_return->tx_wait);
1579 refcount_set(&to_return->usage, 1);
1580 return to_return;
1581 }
1582
1583 /* Arp sent timer expired */
lec_arp_expire_arp(struct timer_list * t)1584 static void lec_arp_expire_arp(struct timer_list *t)
1585 {
1586 struct lec_arp_table *entry;
1587
1588 entry = timer_container_of(entry, t, timer);
1589
1590 pr_debug("\n");
1591 if (entry->status == ESI_ARP_PENDING) {
1592 if (entry->no_tries <= entry->priv->max_retry_count) {
1593 if (entry->is_rdesc)
1594 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1595 entry->mac_addr, NULL, NULL);
1596 else
1597 send_to_lecd(entry->priv, l_arp_xmt,
1598 entry->mac_addr, NULL, NULL);
1599 entry->no_tries++;
1600 }
1601 mod_timer(&entry->timer, jiffies + (1 * HZ));
1602 }
1603 }
1604
1605 /* Unknown/unused vcc expire, remove associated entry */
lec_arp_expire_vcc(struct timer_list * t)1606 static void lec_arp_expire_vcc(struct timer_list *t)
1607 {
1608 unsigned long flags;
1609 struct lec_arp_table *to_remove = timer_container_of(to_remove, t,
1610 timer);
1611 struct lec_priv *priv = to_remove->priv;
1612
1613 timer_delete(&to_remove->timer);
1614
1615 pr_debug("%p %p: vpi:%d vci:%d\n",
1616 to_remove, priv,
1617 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1618 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1619
1620 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1621 hlist_del(&to_remove->next);
1622 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1623
1624 lec_arp_clear_vccs(to_remove);
1625 lec_arp_put(to_remove);
1626 }
1627
__lec_arp_check_expire(struct lec_arp_table * entry,unsigned long now,struct lec_priv * priv)1628 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1629 unsigned long now,
1630 struct lec_priv *priv)
1631 {
1632 unsigned long time_to_check;
1633
1634 if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1635 time_to_check = priv->forward_delay_time;
1636 else
1637 time_to_check = priv->aging_time;
1638
1639 pr_debug("About to expire: %lx - %lx > %lx\n",
1640 now, entry->last_used, time_to_check);
1641 if (time_after(now, entry->last_used + time_to_check) &&
1642 !(entry->flags & LEC_PERMANENT_FLAG) &&
1643 !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */
1644 /* Remove entry */
1645 pr_debug("Entry timed out\n");
1646 lec_arp_remove(priv, entry);
1647 lec_arp_put(entry);
1648 } else {
1649 /* Something else */
1650 if ((entry->status == ESI_VC_PENDING ||
1651 entry->status == ESI_ARP_PENDING) &&
1652 time_after_eq(now, entry->timestamp +
1653 priv->max_unknown_frame_time)) {
1654 entry->timestamp = jiffies;
1655 entry->packets_flooded = 0;
1656 if (entry->status == ESI_VC_PENDING)
1657 send_to_lecd(priv, l_svc_setup,
1658 entry->mac_addr,
1659 entry->atm_addr,
1660 NULL);
1661 }
1662 if (entry->status == ESI_FLUSH_PENDING &&
1663 time_after_eq(now, entry->timestamp +
1664 priv->path_switching_delay)) {
1665 lec_arp_hold(entry);
1666 return true;
1667 }
1668 }
1669
1670 return false;
1671 }
1672 /*
1673 * Expire entries.
1674 * 1. Re-set timer
1675 * 2. For each entry, delete entries that have aged past the age limit.
1676 * 3. For each entry, depending on the status of the entry, perform
1677 * the following maintenance.
1678 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1679 * tick_count is above the max_unknown_frame_time, clear
1680 * the tick_count to zero and clear the packets_flooded counter
1681 * to zero. This supports the packet rate limit per address
1682 * while flooding unknowns.
1683 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1684 * than or equal to the path_switching_delay, change the status
1685 * to ESI_FORWARD_DIRECT. This causes the flush period to end
1686 * regardless of the progress of the flush protocol.
1687 */
lec_arp_check_expire(struct work_struct * work)1688 static void lec_arp_check_expire(struct work_struct *work)
1689 {
1690 unsigned long flags;
1691 struct lec_priv *priv =
1692 container_of(work, struct lec_priv, lec_arp_work.work);
1693 struct hlist_node *next;
1694 struct lec_arp_table *entry;
1695 unsigned long now;
1696 int i;
1697
1698 pr_debug("%p\n", priv);
1699 now = jiffies;
1700 restart:
1701 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1702 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1703 hlist_for_each_entry_safe(entry, next,
1704 &priv->lec_arp_tables[i], next) {
1705 if (__lec_arp_check_expire(entry, now, priv)) {
1706 struct sk_buff *skb;
1707 struct atm_vcc *vcc = entry->vcc;
1708
1709 spin_unlock_irqrestore(&priv->lec_arp_lock,
1710 flags);
1711 while ((skb = skb_dequeue(&entry->tx_wait)))
1712 lec_send(vcc, skb);
1713 entry->last_used = jiffies;
1714 entry->status = ESI_FORWARD_DIRECT;
1715 lec_arp_put(entry);
1716
1717 goto restart;
1718 }
1719 }
1720 }
1721 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1722
1723 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1724 }
1725
1726 /*
1727 * Try to find vcc where mac_address is attached.
1728 *
1729 */
lec_arp_resolve(struct lec_priv * priv,const unsigned char * mac_to_find,int is_rdesc,struct lec_arp_table ** ret_entry)1730 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1731 const unsigned char *mac_to_find,
1732 int is_rdesc,
1733 struct lec_arp_table **ret_entry)
1734 {
1735 unsigned long flags;
1736 struct lec_arp_table *entry;
1737 struct atm_vcc *found;
1738
1739 if (mac_to_find[0] & 0x01) {
1740 switch (priv->lane_version) {
1741 case 1:
1742 return priv->mcast_vcc;
1743 case 2: /* LANE2 wants arp for multicast addresses */
1744 if (ether_addr_equal(mac_to_find, bus_mac))
1745 return priv->mcast_vcc;
1746 break;
1747 default:
1748 break;
1749 }
1750 }
1751
1752 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1753 entry = lec_arp_find(priv, mac_to_find);
1754
1755 if (entry) {
1756 if (entry->status == ESI_FORWARD_DIRECT) {
1757 /* Connection Ok */
1758 entry->last_used = jiffies;
1759 lec_arp_hold(entry);
1760 *ret_entry = entry;
1761 found = entry->vcc;
1762 goto out;
1763 }
1764 /*
1765 * If the LE_ARP cache entry is still pending, reset count to 0
1766 * so another LE_ARP request can be made for this frame.
1767 */
1768 if (entry->status == ESI_ARP_PENDING)
1769 entry->no_tries = 0;
1770 /*
1771 * Data direct VC not yet set up, check to see if the unknown
1772 * frame count is greater than the limit. If the limit has
1773 * not been reached, allow the caller to send packet to
1774 * BUS.
1775 */
1776 if (entry->status != ESI_FLUSH_PENDING &&
1777 entry->packets_flooded <
1778 priv->maximum_unknown_frame_count) {
1779 entry->packets_flooded++;
1780 pr_debug("Flooding..\n");
1781 found = priv->mcast_vcc;
1782 goto out;
1783 }
1784 /*
1785 * We got here because entry->status == ESI_FLUSH_PENDING
1786 * or BUS flood limit was reached for an entry which is
1787 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1788 */
1789 lec_arp_hold(entry);
1790 *ret_entry = entry;
1791 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1792 entry->vcc);
1793 found = NULL;
1794 } else {
1795 /* No matching entry was found */
1796 entry = make_entry(priv, mac_to_find);
1797 pr_debug("Making entry\n");
1798 if (!entry) {
1799 found = priv->mcast_vcc;
1800 goto out;
1801 }
1802 lec_arp_add(priv, entry);
1803 /* We want arp-request(s) to be sent */
1804 entry->packets_flooded = 1;
1805 entry->status = ESI_ARP_PENDING;
1806 entry->no_tries = 1;
1807 entry->last_used = entry->timestamp = jiffies;
1808 entry->is_rdesc = is_rdesc;
1809 if (entry->is_rdesc)
1810 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1811 NULL);
1812 else
1813 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1814 entry->timer.expires = jiffies + (1 * HZ);
1815 entry->timer.function = lec_arp_expire_arp;
1816 add_timer(&entry->timer);
1817 found = priv->mcast_vcc;
1818 }
1819
1820 out:
1821 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1822 return found;
1823 }
1824
1825 static int
lec_addr_delete(struct lec_priv * priv,const unsigned char * atm_addr,unsigned long permanent)1826 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1827 unsigned long permanent)
1828 {
1829 unsigned long flags;
1830 struct hlist_node *next;
1831 struct lec_arp_table *entry;
1832 int i;
1833
1834 pr_debug("\n");
1835 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1836 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1837 hlist_for_each_entry_safe(entry, next,
1838 &priv->lec_arp_tables[i], next) {
1839 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1840 (permanent ||
1841 !(entry->flags & LEC_PERMANENT_FLAG))) {
1842 lec_arp_remove(priv, entry);
1843 lec_arp_put(entry);
1844 }
1845 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1846 return 0;
1847 }
1848 }
1849 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1850 return -1;
1851 }
1852
1853 /*
1854 * Notifies: Response to arp_request (atm_addr != NULL)
1855 */
1856 static void
lec_arp_update(struct lec_priv * priv,const unsigned char * mac_addr,const unsigned char * atm_addr,unsigned long remoteflag,unsigned int targetless_le_arp)1857 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1858 const unsigned char *atm_addr, unsigned long remoteflag,
1859 unsigned int targetless_le_arp)
1860 {
1861 unsigned long flags;
1862 struct hlist_node *next;
1863 struct lec_arp_table *entry, *tmp;
1864 int i;
1865
1866 pr_debug("%smac:%pM\n",
1867 (targetless_le_arp) ? "targetless " : "", mac_addr);
1868
1869 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1870 entry = lec_arp_find(priv, mac_addr);
1871 if (entry == NULL && targetless_le_arp)
1872 goto out; /*
1873 * LANE2: ignore targetless LE_ARPs for which
1874 * we have no entry in the cache. 7.1.30
1875 */
1876 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1877 hlist_for_each_entry_safe(entry, next,
1878 &priv->lec_arp_empty_ones, next) {
1879 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1880 hlist_del(&entry->next);
1881 timer_delete(&entry->timer);
1882 tmp = lec_arp_find(priv, mac_addr);
1883 if (tmp) {
1884 timer_delete(&tmp->timer);
1885 tmp->status = ESI_FORWARD_DIRECT;
1886 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1887 tmp->vcc = entry->vcc;
1888 tmp->old_push = entry->old_push;
1889 tmp->last_used = jiffies;
1890 timer_delete(&entry->timer);
1891 lec_arp_put(entry);
1892 entry = tmp;
1893 } else {
1894 entry->status = ESI_FORWARD_DIRECT;
1895 ether_addr_copy(entry->mac_addr,
1896 mac_addr);
1897 entry->last_used = jiffies;
1898 lec_arp_add(priv, entry);
1899 }
1900 if (remoteflag)
1901 entry->flags |= LEC_REMOTE_FLAG;
1902 else
1903 entry->flags &= ~LEC_REMOTE_FLAG;
1904 pr_debug("After update\n");
1905 dump_arp_table(priv);
1906 goto out;
1907 }
1908 }
1909 }
1910
1911 entry = lec_arp_find(priv, mac_addr);
1912 if (!entry) {
1913 entry = make_entry(priv, mac_addr);
1914 if (!entry)
1915 goto out;
1916 entry->status = ESI_UNKNOWN;
1917 lec_arp_add(priv, entry);
1918 /* Temporary, changes before end of function */
1919 }
1920 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1921 timer_delete(&entry->timer);
1922 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1923 hlist_for_each_entry(tmp,
1924 &priv->lec_arp_tables[i], next) {
1925 if (entry != tmp &&
1926 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1927 /* Vcc to this host exists */
1928 if (tmp->status > ESI_VC_PENDING) {
1929 /*
1930 * ESI_FLUSH_PENDING,
1931 * ESI_FORWARD_DIRECT
1932 */
1933 entry->vcc = tmp->vcc;
1934 entry->old_push = tmp->old_push;
1935 }
1936 entry->status = tmp->status;
1937 break;
1938 }
1939 }
1940 }
1941 if (remoteflag)
1942 entry->flags |= LEC_REMOTE_FLAG;
1943 else
1944 entry->flags &= ~LEC_REMOTE_FLAG;
1945 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1946 entry->status = ESI_VC_PENDING;
1947 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1948 }
1949 pr_debug("After update2\n");
1950 dump_arp_table(priv);
1951 out:
1952 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1953 }
1954
1955 /*
1956 * Notifies: Vcc setup ready
1957 */
1958 static void
lec_vcc_added(struct lec_priv * priv,const struct atmlec_ioc * ioc_data,struct atm_vcc * vcc,void (* old_push)(struct atm_vcc * vcc,struct sk_buff * skb))1959 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1960 struct atm_vcc *vcc,
1961 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1962 {
1963 unsigned long flags;
1964 struct lec_arp_table *entry;
1965 int i, found_entry = 0;
1966
1967 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1968 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1969 if (ioc_data->receive == 2) {
1970 pr_debug("LEC_ARP: Attaching mcast forward\n");
1971 #if 0
1972 entry = lec_arp_find(priv, bus_mac);
1973 if (!entry) {
1974 pr_info("LEC_ARP: Multicast entry not found!\n");
1975 goto out;
1976 }
1977 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1978 entry->recv_vcc = vcc;
1979 entry->old_recv_push = old_push;
1980 #endif
1981 entry = make_entry(priv, bus_mac);
1982 if (entry == NULL)
1983 goto out;
1984 timer_delete(&entry->timer);
1985 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1986 entry->recv_vcc = vcc;
1987 entry->old_recv_push = old_push;
1988 hlist_add_head(&entry->next, &priv->mcast_fwds);
1989 goto out;
1990 } else if (ioc_data->receive == 1) {
1991 /*
1992 * Vcc which we don't want to make default vcc,
1993 * attach it anyway.
1994 */
1995 pr_debug("LEC_ARP:Attaching data direct, not default: %*phN\n",
1996 ATM_ESA_LEN, ioc_data->atm_addr);
1997 entry = make_entry(priv, bus_mac);
1998 if (entry == NULL)
1999 goto out;
2000 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2001 eth_zero_addr(entry->mac_addr);
2002 entry->recv_vcc = vcc;
2003 entry->old_recv_push = old_push;
2004 entry->status = ESI_UNKNOWN;
2005 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2006 entry->timer.function = lec_arp_expire_vcc;
2007 hlist_add_head(&entry->next, &priv->lec_no_forward);
2008 add_timer(&entry->timer);
2009 dump_arp_table(priv);
2010 goto out;
2011 }
2012 pr_debug("LEC_ARP:Attaching data direct, default: %*phN\n",
2013 ATM_ESA_LEN, ioc_data->atm_addr);
2014 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2015 hlist_for_each_entry(entry,
2016 &priv->lec_arp_tables[i], next) {
2017 if (memcmp
2018 (ioc_data->atm_addr, entry->atm_addr,
2019 ATM_ESA_LEN) == 0) {
2020 pr_debug("LEC_ARP: Attaching data direct\n");
2021 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2022 entry->vcc ? entry->vcc->vci : 0,
2023 entry->recv_vcc ? entry->recv_vcc->
2024 vci : 0);
2025 found_entry = 1;
2026 timer_delete(&entry->timer);
2027 entry->vcc = vcc;
2028 entry->old_push = old_push;
2029 if (entry->status == ESI_VC_PENDING) {
2030 if (priv->maximum_unknown_frame_count
2031 == 0)
2032 entry->status =
2033 ESI_FORWARD_DIRECT;
2034 else {
2035 entry->timestamp = jiffies;
2036 entry->status =
2037 ESI_FLUSH_PENDING;
2038 #if 0
2039 send_to_lecd(priv, l_flush_xmt,
2040 NULL,
2041 entry->atm_addr,
2042 NULL);
2043 #endif
2044 }
2045 } else {
2046 /*
2047 * They were forming a connection
2048 * to us, and we to them. Our
2049 * ATM address is numerically lower
2050 * than theirs, so we make connection
2051 * we formed into default VCC (8.1.11).
2052 * Connection they made gets torn
2053 * down. This might confuse some
2054 * clients. Can be changed if
2055 * someone reports trouble...
2056 */
2057 ;
2058 }
2059 }
2060 }
2061 }
2062 if (found_entry) {
2063 pr_debug("After vcc was added\n");
2064 dump_arp_table(priv);
2065 goto out;
2066 }
2067 /*
2068 * Not found, snatch address from first data packet that arrives
2069 * from this vcc
2070 */
2071 entry = make_entry(priv, bus_mac);
2072 if (!entry)
2073 goto out;
2074 entry->vcc = vcc;
2075 entry->old_push = old_push;
2076 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2077 eth_zero_addr(entry->mac_addr);
2078 entry->status = ESI_UNKNOWN;
2079 hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2080 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2081 entry->timer.function = lec_arp_expire_vcc;
2082 add_timer(&entry->timer);
2083 pr_debug("After vcc was added\n");
2084 dump_arp_table(priv);
2085 out:
2086 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2087 }
2088
lec_flush_complete(struct lec_priv * priv,unsigned long tran_id)2089 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2090 {
2091 unsigned long flags;
2092 struct lec_arp_table *entry;
2093 int i;
2094
2095 pr_debug("%lx\n", tran_id);
2096 restart:
2097 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2098 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2099 hlist_for_each_entry(entry,
2100 &priv->lec_arp_tables[i], next) {
2101 if (entry->flush_tran_id == tran_id &&
2102 entry->status == ESI_FLUSH_PENDING) {
2103 struct sk_buff *skb;
2104 struct atm_vcc *vcc = entry->vcc;
2105
2106 lec_arp_hold(entry);
2107 spin_unlock_irqrestore(&priv->lec_arp_lock,
2108 flags);
2109 while ((skb = skb_dequeue(&entry->tx_wait)))
2110 lec_send(vcc, skb);
2111 entry->last_used = jiffies;
2112 entry->status = ESI_FORWARD_DIRECT;
2113 lec_arp_put(entry);
2114 pr_debug("LEC_ARP: Flushed\n");
2115 goto restart;
2116 }
2117 }
2118 }
2119 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2120 dump_arp_table(priv);
2121 }
2122
2123 static void
lec_set_flush_tran_id(struct lec_priv * priv,const unsigned char * atm_addr,unsigned long tran_id)2124 lec_set_flush_tran_id(struct lec_priv *priv,
2125 const unsigned char *atm_addr, unsigned long tran_id)
2126 {
2127 unsigned long flags;
2128 struct lec_arp_table *entry;
2129 int i;
2130
2131 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2132 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2133 hlist_for_each_entry(entry,
2134 &priv->lec_arp_tables[i], next) {
2135 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2136 entry->flush_tran_id = tran_id;
2137 pr_debug("Set flush transaction id to %lx for %p\n",
2138 tran_id, entry);
2139 }
2140 }
2141 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2142 }
2143
lec_mcast_make(struct lec_priv * priv,struct atm_vcc * vcc)2144 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2145 {
2146 unsigned long flags;
2147 unsigned char mac_addr[] = {
2148 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2149 };
2150 struct lec_arp_table *to_add;
2151 struct lec_vcc_priv *vpriv;
2152 int err = 0;
2153
2154 vpriv = kmalloc_obj(struct lec_vcc_priv);
2155 if (!vpriv)
2156 return -ENOMEM;
2157 vpriv->xoff = 0;
2158 vpriv->old_pop = vcc->pop;
2159 vcc->user_back = vpriv;
2160 vcc->pop = lec_pop;
2161 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2162 to_add = make_entry(priv, mac_addr);
2163 if (!to_add) {
2164 vcc->pop = vpriv->old_pop;
2165 kfree(vpriv);
2166 err = -ENOMEM;
2167 goto out;
2168 }
2169 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2170 to_add->status = ESI_FORWARD_DIRECT;
2171 to_add->flags |= LEC_PERMANENT_FLAG;
2172 to_add->vcc = vcc;
2173 to_add->old_push = vcc->push;
2174 vcc->push = lec_push;
2175 priv->mcast_vcc = vcc;
2176 lec_arp_add(priv, to_add);
2177 out:
2178 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2179 return err;
2180 }
2181
lec_vcc_close(struct lec_priv * priv,struct atm_vcc * vcc)2182 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2183 {
2184 unsigned long flags;
2185 struct hlist_node *next;
2186 struct lec_arp_table *entry;
2187 int i;
2188
2189 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2190 dump_arp_table(priv);
2191
2192 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2193
2194 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2195 hlist_for_each_entry_safe(entry, next,
2196 &priv->lec_arp_tables[i], next) {
2197 if (vcc == entry->vcc) {
2198 lec_arp_remove(priv, entry);
2199 lec_arp_put(entry);
2200 if (priv->mcast_vcc == vcc)
2201 priv->mcast_vcc = NULL;
2202 }
2203 }
2204 }
2205
2206 hlist_for_each_entry_safe(entry, next,
2207 &priv->lec_arp_empty_ones, next) {
2208 if (entry->vcc == vcc) {
2209 lec_arp_clear_vccs(entry);
2210 timer_delete(&entry->timer);
2211 hlist_del(&entry->next);
2212 lec_arp_put(entry);
2213 }
2214 }
2215
2216 hlist_for_each_entry_safe(entry, next,
2217 &priv->lec_no_forward, next) {
2218 if (entry->recv_vcc == vcc) {
2219 lec_arp_clear_vccs(entry);
2220 timer_delete(&entry->timer);
2221 hlist_del(&entry->next);
2222 lec_arp_put(entry);
2223 }
2224 }
2225
2226 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2227 if (entry->recv_vcc == vcc) {
2228 lec_arp_clear_vccs(entry);
2229 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2230 hlist_del(&entry->next);
2231 lec_arp_put(entry);
2232 }
2233 }
2234
2235 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2236 dump_arp_table(priv);
2237 }
2238
2239 static void
lec_arp_check_empties(struct lec_priv * priv,struct atm_vcc * vcc,struct sk_buff * skb)2240 lec_arp_check_empties(struct lec_priv *priv,
2241 struct atm_vcc *vcc, struct sk_buff *skb)
2242 {
2243 unsigned long flags;
2244 struct hlist_node *next;
2245 struct lec_arp_table *entry, *tmp;
2246 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2247 unsigned char *src = hdr->h_source;
2248
2249 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2250 hlist_for_each_entry_safe(entry, next,
2251 &priv->lec_arp_empty_ones, next) {
2252 if (vcc == entry->vcc) {
2253 timer_delete(&entry->timer);
2254 ether_addr_copy(entry->mac_addr, src);
2255 entry->status = ESI_FORWARD_DIRECT;
2256 entry->last_used = jiffies;
2257 /* We might have got an entry */
2258 tmp = lec_arp_find(priv, src);
2259 if (tmp) {
2260 lec_arp_remove(priv, tmp);
2261 lec_arp_put(tmp);
2262 }
2263 hlist_del(&entry->next);
2264 lec_arp_add(priv, entry);
2265 goto out;
2266 }
2267 }
2268 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2269 out:
2270 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2271 }
2272
2273 MODULE_DESCRIPTION("ATM LAN Emulation (LANE) support");
2274 MODULE_LICENSE("GPL");
2275