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btrfs: use raid_attr table to find profiles for integrity lowering
[linux/fpc-iii.git] / net / atm / lec.c
blob5a77c235a212f3d08b2e6e9578880819b8fdcbee
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 */
106 static inline void lec_arp_hold(struct lec_arp_table *entry)
107 {
108 refcount_inc(&entry->usage);
109 }
110
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
128 #if IS_ENABLED(CONFIG_BRIDGE)
129 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
130 {
131 char *buff;
132 struct lec_priv *priv;
133
134 /*
135 * Check if this is a BPDU. If so, ask zeppelin to send
136 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
137 * as the Config BPDU has
138 */
139 buff = skb->data + skb->dev->hard_header_len;
140 if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
141 struct sock *sk;
142 struct sk_buff *skb2;
143 struct atmlec_msg *mesg;
144
145 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
146 if (skb2 == NULL)
147 return;
148 skb2->len = sizeof(struct atmlec_msg);
149 mesg = (struct atmlec_msg *)skb2->data;
150 mesg->type = l_topology_change;
151 buff += 4;
152 mesg->content.normal.flag = *buff & 0x01;
153 /* 0x01 is topology change */
154
155 priv = netdev_priv(dev);
156 atm_force_charge(priv->lecd, skb2->truesize);
157 sk = sk_atm(priv->lecd);
158 skb_queue_tail(&sk->sk_receive_queue, skb2);
159 sk->sk_data_ready(sk);
160 }
161 }
162 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
163
164 /*
165 * Open/initialize the netdevice. This is called (in the current kernel)
166 * sometime after booting when the 'ifconfig' program is run.
167 *
168 * This routine should set everything up anew at each open, even
169 * registers that "should" only need to be set once at boot, so that
170 * there is non-reboot way to recover if something goes wrong.
171 */
172
173 static int lec_open(struct net_device *dev)
174 {
175 netif_start_queue(dev);
176
177 return 0;
178 }
179
180 static void
181 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
182 {
183 struct net_device *dev = skb->dev;
184
185 ATM_SKB(skb)->vcc = vcc;
186 atm_account_tx(vcc, skb);
187
188 if (vcc->send(vcc, skb) < 0) {
189 dev->stats.tx_dropped++;
190 return;
191 }
192
193 dev->stats.tx_packets++;
194 dev->stats.tx_bytes += skb->len;
195 }
196
197 static void lec_tx_timeout(struct net_device *dev)
198 {
199 pr_info("%s\n", dev->name);
200 netif_trans_update(dev);
201 netif_wake_queue(dev);
202 }
203
204 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
205 struct net_device *dev)
206 {
207 struct sk_buff *skb2;
208 struct lec_priv *priv = netdev_priv(dev);
209 struct lecdatahdr_8023 *lec_h;
210 struct atm_vcc *vcc;
211 struct lec_arp_table *entry;
212 unsigned char *dst;
213 int min_frame_size;
214 int is_rdesc;
215
216 pr_debug("called\n");
217 if (!priv->lecd) {
218 pr_info("%s:No lecd attached\n", dev->name);
219 dev->stats.tx_errors++;
220 netif_stop_queue(dev);
221 kfree_skb(skb);
222 return NETDEV_TX_OK;
223 }
224
225 pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
226 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
227 (long)skb_end_pointer(skb));
228 #if IS_ENABLED(CONFIG_BRIDGE)
229 if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
230 lec_handle_bridge(skb, dev);
231 #endif
232
233 /* Make sure we have room for lec_id */
234 if (skb_headroom(skb) < 2) {
235 pr_debug("reallocating skb\n");
236 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
237 if (unlikely(!skb2)) {
238 kfree_skb(skb);
239 return NETDEV_TX_OK;
240 }
241 consume_skb(skb);
242 skb = skb2;
243 }
244 skb_push(skb, 2);
245
246 /* Put le header to place */
247 lec_h = (struct lecdatahdr_8023 *)skb->data;
248 lec_h->le_header = htons(priv->lecid);
249
250 #if DUMP_PACKETS >= 2
251 #define MAX_DUMP_SKB 99
252 #elif DUMP_PACKETS >= 1
253 #define MAX_DUMP_SKB 30
254 #endif
255 #if DUMP_PACKETS >= 1
256 printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
257 dev->name, skb->len, priv->lecid);
258 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
259 skb->data, min(skb->len, MAX_DUMP_SKB), true);
260 #endif /* DUMP_PACKETS >= 1 */
261
262 /* Minimum ethernet-frame size */
263 min_frame_size = LEC_MINIMUM_8023_SIZE;
264 if (skb->len < min_frame_size) {
265 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
266 skb2 = skb_copy_expand(skb, 0,
267 min_frame_size - skb->truesize,
268 GFP_ATOMIC);
269 dev_kfree_skb(skb);
270 if (skb2 == NULL) {
271 dev->stats.tx_dropped++;
272 return NETDEV_TX_OK;
273 }
274 skb = skb2;
275 }
276 skb_put(skb, min_frame_size - skb->len);
277 }
278
279 /* Send to right vcc */
280 is_rdesc = 0;
281 dst = lec_h->h_dest;
282 entry = NULL;
283 vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
284 pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
285 dev->name, vcc, vcc ? vcc->flags : 0, entry);
286 if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
287 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
288 pr_debug("%s:queuing packet, MAC address %pM\n",
289 dev->name, lec_h->h_dest);
290 skb_queue_tail(&entry->tx_wait, skb);
291 } else {
292 pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
293 dev->name, lec_h->h_dest);
294 dev->stats.tx_dropped++;
295 dev_kfree_skb(skb);
296 }
297 goto out;
298 }
299 #if DUMP_PACKETS > 0
300 printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
301 dev->name, vcc->vpi, vcc->vci);
302 #endif /* DUMP_PACKETS > 0 */
303
304 while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
305 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
306 lec_send(vcc, skb2);
307 }
308
309 lec_send(vcc, skb);
310
311 if (!atm_may_send(vcc, 0)) {
312 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
313
314 vpriv->xoff = 1;
315 netif_stop_queue(dev);
316
317 /*
318 * vcc->pop() might have occurred in between, making
319 * the vcc usuable again. Since xmit is serialized,
320 * this is the only situation we have to re-test.
321 */
322
323 if (atm_may_send(vcc, 0))
324 netif_wake_queue(dev);
325 }
326
327 out:
328 if (entry)
329 lec_arp_put(entry);
330 netif_trans_update(dev);
331 return NETDEV_TX_OK;
332 }
333
334 /* The inverse routine to net_open(). */
335 static int lec_close(struct net_device *dev)
336 {
337 netif_stop_queue(dev);
338 return 0;
339 }
340
341 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
342 {
343 unsigned long flags;
344 struct net_device *dev = (struct net_device *)vcc->proto_data;
345 struct lec_priv *priv = netdev_priv(dev);
346 struct atmlec_msg *mesg;
347 struct lec_arp_table *entry;
348 int i;
349 char *tmp; /* FIXME */
350
351 WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
352 mesg = (struct atmlec_msg *)skb->data;
353 tmp = skb->data;
354 tmp += sizeof(struct atmlec_msg);
355 pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
356 switch (mesg->type) {
357 case l_set_mac_addr:
358 for (i = 0; i < 6; i++)
359 dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
360 break;
361 case l_del_mac_addr:
362 for (i = 0; i < 6; i++)
363 dev->dev_addr[i] = 0;
364 break;
365 case l_addr_delete:
366 lec_addr_delete(priv, mesg->content.normal.atm_addr,
367 mesg->content.normal.flag);
368 break;
369 case l_topology_change:
370 priv->topology_change = mesg->content.normal.flag;
371 break;
372 case l_flush_complete:
373 lec_flush_complete(priv, mesg->content.normal.flag);
374 break;
375 case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */
376 spin_lock_irqsave(&priv->lec_arp_lock, flags);
377 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
378 lec_arp_remove(priv, entry);
379 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
380
381 if (mesg->content.normal.no_source_le_narp)
382 break;
383 /* FALL THROUGH */
384 case l_arp_update:
385 lec_arp_update(priv, mesg->content.normal.mac_addr,
386 mesg->content.normal.atm_addr,
387 mesg->content.normal.flag,
388 mesg->content.normal.targetless_le_arp);
389 pr_debug("in l_arp_update\n");
390 if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */
391 pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
392 mesg->sizeoftlvs);
393 lane2_associate_ind(dev, mesg->content.normal.mac_addr,
394 tmp, mesg->sizeoftlvs);
395 }
396 break;
397 case l_config:
398 priv->maximum_unknown_frame_count =
399 mesg->content.config.maximum_unknown_frame_count;
400 priv->max_unknown_frame_time =
401 (mesg->content.config.max_unknown_frame_time * HZ);
402 priv->max_retry_count = mesg->content.config.max_retry_count;
403 priv->aging_time = (mesg->content.config.aging_time * HZ);
404 priv->forward_delay_time =
405 (mesg->content.config.forward_delay_time * HZ);
406 priv->arp_response_time =
407 (mesg->content.config.arp_response_time * HZ);
408 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
409 priv->path_switching_delay =
410 (mesg->content.config.path_switching_delay * HZ);
411 priv->lane_version = mesg->content.config.lane_version;
412 /* LANE2 */
413 priv->lane2_ops = NULL;
414 if (priv->lane_version > 1)
415 priv->lane2_ops = &lane2_ops;
416 rtnl_lock();
417 if (dev_set_mtu(dev, mesg->content.config.mtu))
418 pr_info("%s: change_mtu to %d failed\n",
419 dev->name, mesg->content.config.mtu);
420 rtnl_unlock();
421 priv->is_proxy = mesg->content.config.is_proxy;
422 break;
423 case l_flush_tran_id:
424 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
425 mesg->content.normal.flag);
426 break;
427 case l_set_lecid:
428 priv->lecid =
429 (unsigned short)(0xffff & mesg->content.normal.flag);
430 break;
431 case l_should_bridge:
432 #if IS_ENABLED(CONFIG_BRIDGE)
433 {
434 pr_debug("%s: bridge zeppelin asks about %pM\n",
435 dev->name, mesg->content.proxy.mac_addr);
436
437 if (br_fdb_test_addr_hook == NULL)
438 break;
439
440 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
441 /* hit from bridge table, send LE_ARP_RESPONSE */
442 struct sk_buff *skb2;
443 struct sock *sk;
444
445 pr_debug("%s: entry found, responding to zeppelin\n",
446 dev->name);
447 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
448 if (skb2 == NULL)
449 break;
450 skb2->len = sizeof(struct atmlec_msg);
451 skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
452 atm_force_charge(priv->lecd, skb2->truesize);
453 sk = sk_atm(priv->lecd);
454 skb_queue_tail(&sk->sk_receive_queue, skb2);
455 sk->sk_data_ready(sk);
456 }
457 }
458 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
459 break;
460 default:
461 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
462 dev_kfree_skb(skb);
463 return -EINVAL;
464 }
465 dev_kfree_skb(skb);
466 return 0;
467 }
468
469 static void lec_atm_close(struct atm_vcc *vcc)
470 {
471 struct sk_buff *skb;
472 struct net_device *dev = (struct net_device *)vcc->proto_data;
473 struct lec_priv *priv = netdev_priv(dev);
474
475 priv->lecd = NULL;
476 /* Do something needful? */
477
478 netif_stop_queue(dev);
479 lec_arp_destroy(priv);
480
481 if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
482 pr_info("%s closing with messages pending\n", dev->name);
483 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
484 atm_return(vcc, skb->truesize);
485 dev_kfree_skb(skb);
486 }
487
488 pr_info("%s: Shut down!\n", dev->name);
489 module_put(THIS_MODULE);
490 }
491
492 static const struct atmdev_ops lecdev_ops = {
493 .close = lec_atm_close,
494 .send = lec_atm_send
495 };
496
497 static struct atm_dev lecatm_dev = {
498 .ops = &lecdev_ops,
499 .type = "lec",
500 .number = 999, /* dummy device number */
501 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
502 };
503
504 /*
505 * LANE2: new argument struct sk_buff *data contains
506 * the LE_ARP based TLVs introduced in the LANE2 spec
507 */
508 static int
509 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
510 const unsigned char *mac_addr, const unsigned char *atm_addr,
511 struct sk_buff *data)
512 {
513 struct sock *sk;
514 struct sk_buff *skb;
515 struct atmlec_msg *mesg;
516
517 if (!priv || !priv->lecd)
518 return -1;
519 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
520 if (!skb)
521 return -1;
522 skb->len = sizeof(struct atmlec_msg);
523 mesg = (struct atmlec_msg *)skb->data;
524 memset(mesg, 0, sizeof(struct atmlec_msg));
525 mesg->type = type;
526 if (data != NULL)
527 mesg->sizeoftlvs = data->len;
528 if (mac_addr)
529 ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
530 else
531 mesg->content.normal.targetless_le_arp = 1;
532 if (atm_addr)
533 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
534
535 atm_force_charge(priv->lecd, skb->truesize);
536 sk = sk_atm(priv->lecd);
537 skb_queue_tail(&sk->sk_receive_queue, skb);
538 sk->sk_data_ready(sk);
539
540 if (data != NULL) {
541 pr_debug("about to send %d bytes of data\n", data->len);
542 atm_force_charge(priv->lecd, data->truesize);
543 skb_queue_tail(&sk->sk_receive_queue, data);
544 sk->sk_data_ready(sk);
545 }
546
547 return 0;
548 }
549
550 static void lec_set_multicast_list(struct net_device *dev)
551 {
552 /*
553 * by default, all multicast frames arrive over the bus.
554 * eventually support selective multicast service
555 */
556 }
557
558 static const struct net_device_ops lec_netdev_ops = {
559 .ndo_open = lec_open,
560 .ndo_stop = lec_close,
561 .ndo_start_xmit = lec_start_xmit,
562 .ndo_tx_timeout = lec_tx_timeout,
563 .ndo_set_rx_mode = lec_set_multicast_list,
564 };
565
566 static const unsigned char lec_ctrl_magic[] = {
567 0xff,
568 0x00,
569 0x01,
570 0x01
571 };
572
573 #define LEC_DATA_DIRECT_8023 2
574 #define LEC_DATA_DIRECT_8025 3
575
576 static int lec_is_data_direct(struct atm_vcc *vcc)
577 {
578 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
579 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
580 }
581
582 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
583 {
584 unsigned long flags;
585 struct net_device *dev = (struct net_device *)vcc->proto_data;
586 struct lec_priv *priv = netdev_priv(dev);
587
588 #if DUMP_PACKETS > 0
589 printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
590 dev->name, vcc->vpi, vcc->vci);
591 #endif
592 if (!skb) {
593 pr_debug("%s: null skb\n", dev->name);
594 lec_vcc_close(priv, vcc);
595 return;
596 }
597 #if DUMP_PACKETS >= 2
598 #define MAX_SKB_DUMP 99
599 #elif DUMP_PACKETS >= 1
600 #define MAX_SKB_DUMP 30
601 #endif
602 #if DUMP_PACKETS > 0
603 printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
604 dev->name, skb->len, priv->lecid);
605 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
606 skb->data, min(MAX_SKB_DUMP, skb->len), true);
607 #endif /* DUMP_PACKETS > 0 */
608 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
609 /* Control frame, to daemon */
610 struct sock *sk = sk_atm(vcc);
611
612 pr_debug("%s: To daemon\n", dev->name);
613 skb_queue_tail(&sk->sk_receive_queue, skb);
614 sk->sk_data_ready(sk);
615 } else { /* Data frame, queue to protocol handlers */
616 struct lec_arp_table *entry;
617 unsigned char *src, *dst;
618
619 atm_return(vcc, skb->truesize);
620 if (*(__be16 *) skb->data == htons(priv->lecid) ||
621 !priv->lecd || !(dev->flags & IFF_UP)) {
622 /*
623 * Probably looping back, or if lecd is missing,
624 * lecd has gone down
625 */
626 pr_debug("Ignoring frame...\n");
627 dev_kfree_skb(skb);
628 return;
629 }
630 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
631
632 /*
633 * If this is a Data Direct VCC, and the VCC does not match
634 * the LE_ARP cache entry, delete the LE_ARP cache entry.
635 */
636 spin_lock_irqsave(&priv->lec_arp_lock, flags);
637 if (lec_is_data_direct(vcc)) {
638 src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
639 entry = lec_arp_find(priv, src);
640 if (entry && entry->vcc != vcc) {
641 lec_arp_remove(priv, entry);
642 lec_arp_put(entry);
643 }
644 }
645 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
646
647 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
648 !priv->is_proxy && /* Proxy wants all the packets */
649 memcmp(dst, dev->dev_addr, dev->addr_len)) {
650 dev_kfree_skb(skb);
651 return;
652 }
653 if (!hlist_empty(&priv->lec_arp_empty_ones))
654 lec_arp_check_empties(priv, vcc, skb);
655 skb_pull(skb, 2); /* skip lec_id */
656 skb->protocol = eth_type_trans(skb, dev);
657 dev->stats.rx_packets++;
658 dev->stats.rx_bytes += skb->len;
659 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
660 netif_rx(skb);
661 }
662 }
663
664 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
665 {
666 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
667 struct net_device *dev = skb->dev;
668
669 if (vpriv == NULL) {
670 pr_info("vpriv = NULL!?!?!?\n");
671 return;
672 }
673
674 vpriv->old_pop(vcc, skb);
675
676 if (vpriv->xoff && atm_may_send(vcc, 0)) {
677 vpriv->xoff = 0;
678 if (netif_running(dev) && netif_queue_stopped(dev))
679 netif_wake_queue(dev);
680 }
681 }
682
683 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
684 {
685 struct lec_vcc_priv *vpriv;
686 int bytes_left;
687 struct atmlec_ioc ioc_data;
688
689 /* Lecd must be up in this case */
690 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
691 if (bytes_left != 0)
692 pr_info("copy from user failed for %d bytes\n", bytes_left);
693 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
694 return -EINVAL;
695 ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF);
696 if (!dev_lec[ioc_data.dev_num])
697 return -EINVAL;
698 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
699 if (!vpriv)
700 return -ENOMEM;
701 vpriv->xoff = 0;
702 vpriv->old_pop = vcc->pop;
703 vcc->user_back = vpriv;
704 vcc->pop = lec_pop;
705 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
706 &ioc_data, vcc, vcc->push);
707 vcc->proto_data = dev_lec[ioc_data.dev_num];
708 vcc->push = lec_push;
709 return 0;
710 }
711
712 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
713 {
714 if (arg < 0 || arg >= MAX_LEC_ITF)
715 return -EINVAL;
716 arg = array_index_nospec(arg, MAX_LEC_ITF);
717 if (!dev_lec[arg])
718 return -EINVAL;
719 vcc->proto_data = dev_lec[arg];
720 return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
721 }
722
723 /* Initialize device. */
724 static int lecd_attach(struct atm_vcc *vcc, int arg)
725 {
726 int i;
727 struct lec_priv *priv;
728
729 if (arg < 0)
730 arg = 0;
731 if (arg >= MAX_LEC_ITF)
732 return -EINVAL;
733 i = array_index_nospec(arg, MAX_LEC_ITF);
734 if (!dev_lec[i]) {
735 int size;
736
737 size = sizeof(struct lec_priv);
738 dev_lec[i] = alloc_etherdev(size);
739 if (!dev_lec[i])
740 return -ENOMEM;
741 dev_lec[i]->netdev_ops = &lec_netdev_ops;
742 dev_lec[i]->max_mtu = 18190;
743 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
744 if (register_netdev(dev_lec[i])) {
745 free_netdev(dev_lec[i]);
746 return -EINVAL;
747 }
748
749 priv = netdev_priv(dev_lec[i]);
750 } else {
751 priv = netdev_priv(dev_lec[i]);
752 if (priv->lecd)
753 return -EADDRINUSE;
754 }
755 lec_arp_init(priv);
756 priv->itfnum = i; /* LANE2 addition */
757 priv->lecd = vcc;
758 vcc->dev = &lecatm_dev;
759 vcc_insert_socket(sk_atm(vcc));
760
761 vcc->proto_data = dev_lec[i];
762 set_bit(ATM_VF_META, &vcc->flags);
763 set_bit(ATM_VF_READY, &vcc->flags);
764
765 /* Set default values to these variables */
766 priv->maximum_unknown_frame_count = 1;
767 priv->max_unknown_frame_time = (1 * HZ);
768 priv->vcc_timeout_period = (1200 * HZ);
769 priv->max_retry_count = 1;
770 priv->aging_time = (300 * HZ);
771 priv->forward_delay_time = (15 * HZ);
772 priv->topology_change = 0;
773 priv->arp_response_time = (1 * HZ);
774 priv->flush_timeout = (4 * HZ);
775 priv->path_switching_delay = (6 * HZ);
776
777 if (dev_lec[i]->flags & IFF_UP)
778 netif_start_queue(dev_lec[i]);
779 __module_get(THIS_MODULE);
780 return i;
781 }
782
783 #ifdef CONFIG_PROC_FS
784 static const char *lec_arp_get_status_string(unsigned char status)
785 {
786 static const char *const lec_arp_status_string[] = {
787 "ESI_UNKNOWN ",
788 "ESI_ARP_PENDING ",
789 "ESI_VC_PENDING ",
790 "<Undefined> ",
791 "ESI_FLUSH_PENDING ",
792 "ESI_FORWARD_DIRECT"
793 };
794
795 if (status > ESI_FORWARD_DIRECT)
796 status = 3; /* ESI_UNDEFINED */
797 return lec_arp_status_string[status];
798 }
799
800 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
801 {
802 int i;
803
804 for (i = 0; i < ETH_ALEN; i++)
805 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
806 seq_printf(seq, " ");
807 for (i = 0; i < ATM_ESA_LEN; i++)
808 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
809 seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
810 entry->flags & 0xffff);
811 if (entry->vcc)
812 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
813 else
814 seq_printf(seq, " ");
815 if (entry->recv_vcc) {
816 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi,
817 entry->recv_vcc->vci);
818 }
819 seq_putc(seq, '\n');
820 }
821
822 struct lec_state {
823 unsigned long flags;
824 struct lec_priv *locked;
825 struct hlist_node *node;
826 struct net_device *dev;
827 int itf;
828 int arp_table;
829 int misc_table;
830 };
831
832 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
833 loff_t *l)
834 {
835 struct hlist_node *e = state->node;
836
837 if (!e)
838 e = tbl->first;
839 if (e == SEQ_START_TOKEN) {
840 e = tbl->first;
841 --*l;
842 }
843
844 for (; e; e = e->next) {
845 if (--*l < 0)
846 break;
847 }
848 state->node = e;
849
850 return (*l < 0) ? state : NULL;
851 }
852
853 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
854 struct lec_priv *priv)
855 {
856 void *v = NULL;
857 int p;
858
859 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
860 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
861 if (v)
862 break;
863 }
864 state->arp_table = p;
865 return v;
866 }
867
868 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
869 struct lec_priv *priv)
870 {
871 struct hlist_head *lec_misc_tables[] = {
872 &priv->lec_arp_empty_ones,
873 &priv->lec_no_forward,
874 &priv->mcast_fwds
875 };
876 void *v = NULL;
877 int q;
878
879 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
880 v = lec_tbl_walk(state, lec_misc_tables[q], l);
881 if (v)
882 break;
883 }
884 state->misc_table = q;
885 return v;
886 }
887
888 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
889 struct lec_priv *priv)
890 {
891 if (!state->locked) {
892 state->locked = priv;
893 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
894 }
895 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
896 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
897 state->locked = NULL;
898 /* Partial state reset for the next time we get called */
899 state->arp_table = state->misc_table = 0;
900 }
901 return state->locked;
902 }
903
904 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
905 {
906 struct net_device *dev;
907 void *v;
908
909 dev = state->dev ? state->dev : dev_lec[state->itf];
910 v = (dev && netdev_priv(dev)) ?
911 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
912 if (!v && dev) {
913 dev_put(dev);
914 /* Partial state reset for the next time we get called */
915 dev = NULL;
916 }
917 state->dev = dev;
918 return v;
919 }
920
921 static void *lec_get_idx(struct lec_state *state, loff_t l)
922 {
923 void *v = NULL;
924
925 for (; state->itf < MAX_LEC_ITF; state->itf++) {
926 v = lec_itf_walk(state, &l);
927 if (v)
928 break;
929 }
930 return v;
931 }
932
933 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
934 {
935 struct lec_state *state = seq->private;
936
937 state->itf = 0;
938 state->dev = NULL;
939 state->locked = NULL;
940 state->arp_table = 0;
941 state->misc_table = 0;
942 state->node = SEQ_START_TOKEN;
943
944 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
945 }
946
947 static void lec_seq_stop(struct seq_file *seq, void *v)
948 {
949 struct lec_state *state = seq->private;
950
951 if (state->dev) {
952 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
953 state->flags);
954 dev_put(state->dev);
955 }
956 }
957
958 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
959 {
960 struct lec_state *state = seq->private;
961
962 v = lec_get_idx(state, 1);
963 *pos += !!PTR_ERR(v);
964 return v;
965 }
966
967 static int lec_seq_show(struct seq_file *seq, void *v)
968 {
969 static const char lec_banner[] =
970 "Itf MAC ATM destination"
971 " Status Flags "
972 "VPI/VCI Recv VPI/VCI\n";
973
974 if (v == SEQ_START_TOKEN)
975 seq_puts(seq, lec_banner);
976 else {
977 struct lec_state *state = seq->private;
978 struct net_device *dev = state->dev;
979 struct lec_arp_table *entry = hlist_entry(state->node,
980 struct lec_arp_table,
981 next);
982
983 seq_printf(seq, "%s ", dev->name);
984 lec_info(seq, entry);
985 }
986 return 0;
987 }
988
989 static const struct seq_operations lec_seq_ops = {
990 .start = lec_seq_start,
991 .next = lec_seq_next,
992 .stop = lec_seq_stop,
993 .show = lec_seq_show,
994 };
995 #endif
996
997 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
998 {
999 struct atm_vcc *vcc = ATM_SD(sock);
1000 int err = 0;
1001
1002 switch (cmd) {
1003 case ATMLEC_CTRL:
1004 case ATMLEC_MCAST:
1005 case ATMLEC_DATA:
1006 if (!capable(CAP_NET_ADMIN))
1007 return -EPERM;
1008 break;
1009 default:
1010 return -ENOIOCTLCMD;
1011 }
1012
1013 switch (cmd) {
1014 case ATMLEC_CTRL:
1015 err = lecd_attach(vcc, (int)arg);
1016 if (err >= 0)
1017 sock->state = SS_CONNECTED;
1018 break;
1019 case ATMLEC_MCAST:
1020 err = lec_mcast_attach(vcc, (int)arg);
1021 break;
1022 case ATMLEC_DATA:
1023 err = lec_vcc_attach(vcc, (void __user *)arg);
1024 break;
1025 }
1026
1027 return err;
1028 }
1029
1030 static struct atm_ioctl lane_ioctl_ops = {
1031 .owner = THIS_MODULE,
1032 .ioctl = lane_ioctl,
1033 };
1034
1035 static int __init lane_module_init(void)
1036 {
1037 #ifdef CONFIG_PROC_FS
1038 struct proc_dir_entry *p;
1039
1040 p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops,
1041 sizeof(struct lec_state), NULL);
1042 if (!p) {
1043 pr_err("Unable to initialize /proc/net/atm/lec\n");
1044 return -ENOMEM;
1045 }
1046 #endif
1047
1048 register_atm_ioctl(&lane_ioctl_ops);
1049 pr_info("lec.c: initialized\n");
1050 return 0;
1051 }
1052
1053 static void __exit lane_module_cleanup(void)
1054 {
1055 int i;
1056
1057 #ifdef CONFIG_PROC_FS
1058 remove_proc_entry("lec", atm_proc_root);
1059 #endif
1060
1061 deregister_atm_ioctl(&lane_ioctl_ops);
1062
1063 for (i = 0; i < MAX_LEC_ITF; i++) {
1064 if (dev_lec[i] != NULL) {
1065 unregister_netdev(dev_lec[i]);
1066 free_netdev(dev_lec[i]);
1067 dev_lec[i] = NULL;
1068 }
1069 }
1070 }
1071
1072 module_init(lane_module_init);
1073 module_exit(lane_module_cleanup);
1074
1075 /*
1076 * LANE2: 3.1.3, LE_RESOLVE.request
1077 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1078 * If sizeoftlvs == NULL the default TLVs associated with with this
1079 * lec will be used.
1080 * If dst_mac == NULL, targetless LE_ARP will be sent
1081 */
1082 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1083 u8 **tlvs, u32 *sizeoftlvs)
1084 {
1085 unsigned long flags;
1086 struct lec_priv *priv = netdev_priv(dev);
1087 struct lec_arp_table *table;
1088 struct sk_buff *skb;
1089 int retval;
1090
1091 if (force == 0) {
1092 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1093 table = lec_arp_find(priv, dst_mac);
1094 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1095 if (table == NULL)
1096 return -1;
1097
1098 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1099 if (*tlvs == NULL)
1100 return -1;
1101
1102 *sizeoftlvs = table->sizeoftlvs;
1103
1104 return 0;
1105 }
1106
1107 if (sizeoftlvs == NULL)
1108 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1109
1110 else {
1111 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1112 if (skb == NULL)
1113 return -1;
1114 skb->len = *sizeoftlvs;
1115 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1116 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1117 }
1118 return retval;
1119 }
1120
1121 /*
1122 * LANE2: 3.1.4, LE_ASSOCIATE.request
1123 * Associate the *tlvs with the *lan_dst address.
1124 * Will overwrite any previous association
1125 * Returns 1 for success, 0 for failure (out of memory)
1126 *
1127 */
1128 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1129 const u8 *tlvs, u32 sizeoftlvs)
1130 {
1131 int retval;
1132 struct sk_buff *skb;
1133 struct lec_priv *priv = netdev_priv(dev);
1134
1135 if (!ether_addr_equal(lan_dst, dev->dev_addr))
1136 return 0; /* not our mac address */
1137
1138 kfree(priv->tlvs); /* NULL if there was no previous association */
1139
1140 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1141 if (priv->tlvs == NULL)
1142 return 0;
1143 priv->sizeoftlvs = sizeoftlvs;
1144
1145 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1146 if (skb == NULL)
1147 return 0;
1148 skb->len = sizeoftlvs;
1149 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1150 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1151 if (retval != 0)
1152 pr_info("lec.c: lane2_associate_req() failed\n");
1153 /*
1154 * If the previous association has changed we must
1155 * somehow notify other LANE entities about the change
1156 */
1157 return 1;
1158 }
1159
1160 /*
1161 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1162 *
1163 */
1164 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1165 const u8 *tlvs, u32 sizeoftlvs)
1166 {
1167 #if 0
1168 int i = 0;
1169 #endif
1170 struct lec_priv *priv = netdev_priv(dev);
1171 #if 0 /*
1172 * Why have the TLVs in LE_ARP entries
1173 * since we do not use them? When you
1174 * uncomment this code, make sure the
1175 * TLVs get freed when entry is killed
1176 */
1177 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1178
1179 if (entry == NULL)
1180 return; /* should not happen */
1181
1182 kfree(entry->tlvs);
1183
1184 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1185 if (entry->tlvs == NULL)
1186 return;
1187 entry->sizeoftlvs = sizeoftlvs;
1188 #endif
1189 #if 0
1190 pr_info("\n");
1191 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1192 while (i < sizeoftlvs)
1193 pr_cont("%02x ", tlvs[i++]);
1194
1195 pr_cont("\n");
1196 #endif
1197
1198 /* tell MPOA about the TLVs we saw */
1199 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1200 priv->lane2_ops->associate_indicator(dev, mac_addr,
1201 tlvs, sizeoftlvs);
1202 }
1203 }
1204
1205 /*
1206 * Here starts what used to lec_arpc.c
1207 *
1208 * lec_arpc.c was added here when making
1209 * lane client modular. October 1997
1210 */
1211
1212 #include <linux/types.h>
1213 #include <linux/timer.h>
1214 #include <linux/param.h>
1215 #include <linux/atomic.h>
1216 #include <linux/inetdevice.h>
1217 #include <net/route.h>
1218
1219 #if 0
1220 #define pr_debug(format, args...)
1221 /*
1222 #define pr_debug printk
1223 */
1224 #endif
1225 #define DEBUG_ARP_TABLE 0
1226
1227 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1228
1229 static void lec_arp_check_expire(struct work_struct *work);
1230 static void lec_arp_expire_arp(struct timer_list *t);
1231
1232 /*
1233 * Arp table funcs
1234 */
1235
1236 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1237
1238 /*
1239 * Initialization of arp-cache
1240 */
1241 static void lec_arp_init(struct lec_priv *priv)
1242 {
1243 unsigned short i;
1244
1245 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1246 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1247 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1248 INIT_HLIST_HEAD(&priv->lec_no_forward);
1249 INIT_HLIST_HEAD(&priv->mcast_fwds);
1250 spin_lock_init(&priv->lec_arp_lock);
1251 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1252 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1253 }
1254
1255 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1256 {
1257 if (entry->vcc) {
1258 struct atm_vcc *vcc = entry->vcc;
1259 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1260 struct net_device *dev = (struct net_device *)vcc->proto_data;
1261
1262 vcc->pop = vpriv->old_pop;
1263 if (vpriv->xoff)
1264 netif_wake_queue(dev);
1265 kfree(vpriv);
1266 vcc->user_back = NULL;
1267 vcc->push = entry->old_push;
1268 vcc_release_async(vcc, -EPIPE);
1269 entry->vcc = NULL;
1270 }
1271 if (entry->recv_vcc) {
1272 entry->recv_vcc->push = entry->old_recv_push;
1273 vcc_release_async(entry->recv_vcc, -EPIPE);
1274 entry->recv_vcc = NULL;
1275 }
1276 }
1277
1278 /*
1279 * Insert entry to lec_arp_table
1280 * LANE2: Add to the end of the list to satisfy 8.1.13
1281 */
1282 static inline void
1283 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1284 {
1285 struct hlist_head *tmp;
1286
1287 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1288 hlist_add_head(&entry->next, tmp);
1289
1290 pr_debug("Added entry:%pM\n", entry->mac_addr);
1291 }
1292
1293 /*
1294 * Remove entry from lec_arp_table
1295 */
1296 static int
1297 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1298 {
1299 struct lec_arp_table *entry;
1300 int i, remove_vcc = 1;
1301
1302 if (!to_remove)
1303 return -1;
1304
1305 hlist_del(&to_remove->next);
1306 del_timer(&to_remove->timer);
1307
1308 /*
1309 * If this is the only MAC connected to this VCC,
1310 * also tear down the VCC
1311 */
1312 if (to_remove->status >= ESI_FLUSH_PENDING) {
1313 /*
1314 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1315 */
1316 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1317 hlist_for_each_entry(entry,
1318 &priv->lec_arp_tables[i], next) {
1319 if (memcmp(to_remove->atm_addr,
1320 entry->atm_addr, ATM_ESA_LEN) == 0) {
1321 remove_vcc = 0;
1322 break;
1323 }
1324 }
1325 }
1326 if (remove_vcc)
1327 lec_arp_clear_vccs(to_remove);
1328 }
1329 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */
1330
1331 pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1332 return 0;
1333 }
1334
1335 #if DEBUG_ARP_TABLE
1336 static const char *get_status_string(unsigned char st)
1337 {
1338 switch (st) {
1339 case ESI_UNKNOWN:
1340 return "ESI_UNKNOWN";
1341 case ESI_ARP_PENDING:
1342 return "ESI_ARP_PENDING";
1343 case ESI_VC_PENDING:
1344 return "ESI_VC_PENDING";
1345 case ESI_FLUSH_PENDING:
1346 return "ESI_FLUSH_PENDING";
1347 case ESI_FORWARD_DIRECT:
1348 return "ESI_FORWARD_DIRECT";
1349 }
1350 return "<UNKNOWN>";
1351 }
1352
1353 static void dump_arp_table(struct lec_priv *priv)
1354 {
1355 struct lec_arp_table *rulla;
1356 char buf[256];
1357 int i, j, offset;
1358
1359 pr_info("Dump %p:\n", priv);
1360 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1361 hlist_for_each_entry(rulla,
1362 &priv->lec_arp_tables[i], next) {
1363 offset = 0;
1364 offset += sprintf(buf, "%d: %p\n", i, rulla);
1365 offset += sprintf(buf + offset, "Mac: %pM",
1366 rulla->mac_addr);
1367 offset += sprintf(buf + offset, " Atm:");
1368 for (j = 0; j < ATM_ESA_LEN; j++) {
1369 offset += sprintf(buf + offset,
1370 "%2.2x ",
1371 rulla->atm_addr[j] & 0xff);
1372 }
1373 offset += sprintf(buf + offset,
1374 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1375 rulla->vcc ? rulla->vcc->vpi : 0,
1376 rulla->vcc ? rulla->vcc->vci : 0,
1377 rulla->recv_vcc ? rulla->recv_vcc->
1378 vpi : 0,
1379 rulla->recv_vcc ? rulla->recv_vcc->
1380 vci : 0, rulla->last_used,
1381 rulla->timestamp, rulla->no_tries);
1382 offset +=
1383 sprintf(buf + offset,
1384 "Flags:%x, Packets_flooded:%x, Status: %s ",
1385 rulla->flags, rulla->packets_flooded,
1386 get_status_string(rulla->status));
1387 pr_info("%s\n", buf);
1388 }
1389 }
1390
1391 if (!hlist_empty(&priv->lec_no_forward))
1392 pr_info("No forward\n");
1393 hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1394 offset = 0;
1395 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1396 offset += sprintf(buf + offset, " Atm:");
1397 for (j = 0; j < ATM_ESA_LEN; j++) {
1398 offset += sprintf(buf + offset, "%2.2x ",
1399 rulla->atm_addr[j] & 0xff);
1400 }
1401 offset += sprintf(buf + offset,
1402 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1403 rulla->vcc ? rulla->vcc->vpi : 0,
1404 rulla->vcc ? rulla->vcc->vci : 0,
1405 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1406 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1407 rulla->last_used,
1408 rulla->timestamp, rulla->no_tries);
1409 offset += sprintf(buf + offset,
1410 "Flags:%x, Packets_flooded:%x, Status: %s ",
1411 rulla->flags, rulla->packets_flooded,
1412 get_status_string(rulla->status));
1413 pr_info("%s\n", buf);
1414 }
1415
1416 if (!hlist_empty(&priv->lec_arp_empty_ones))
1417 pr_info("Empty ones\n");
1418 hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1419 offset = 0;
1420 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1421 offset += sprintf(buf + offset, " Atm:");
1422 for (j = 0; j < ATM_ESA_LEN; j++) {
1423 offset += sprintf(buf + offset, "%2.2x ",
1424 rulla->atm_addr[j] & 0xff);
1425 }
1426 offset += sprintf(buf + offset,
1427 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1428 rulla->vcc ? rulla->vcc->vpi : 0,
1429 rulla->vcc ? rulla->vcc->vci : 0,
1430 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1431 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1432 rulla->last_used,
1433 rulla->timestamp, rulla->no_tries);
1434 offset += sprintf(buf + offset,
1435 "Flags:%x, Packets_flooded:%x, Status: %s ",
1436 rulla->flags, rulla->packets_flooded,
1437 get_status_string(rulla->status));
1438 pr_info("%s", buf);
1439 }
1440
1441 if (!hlist_empty(&priv->mcast_fwds))
1442 pr_info("Multicast Forward VCCs\n");
1443 hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1444 offset = 0;
1445 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1446 offset += sprintf(buf + offset, " Atm:");
1447 for (j = 0; j < ATM_ESA_LEN; j++) {
1448 offset += sprintf(buf + offset, "%2.2x ",
1449 rulla->atm_addr[j] & 0xff);
1450 }
1451 offset += sprintf(buf + offset,
1452 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1453 rulla->vcc ? rulla->vcc->vpi : 0,
1454 rulla->vcc ? rulla->vcc->vci : 0,
1455 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1456 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1457 rulla->last_used,
1458 rulla->timestamp, rulla->no_tries);
1459 offset += sprintf(buf + offset,
1460 "Flags:%x, Packets_flooded:%x, Status: %s ",
1461 rulla->flags, rulla->packets_flooded,
1462 get_status_string(rulla->status));
1463 pr_info("%s\n", buf);
1464 }
1465
1466 }
1467 #else
1468 #define dump_arp_table(priv) do { } while (0)
1469 #endif
1470
1471 /*
1472 * Destruction of arp-cache
1473 */
1474 static void lec_arp_destroy(struct lec_priv *priv)
1475 {
1476 unsigned long flags;
1477 struct hlist_node *next;
1478 struct lec_arp_table *entry;
1479 int i;
1480
1481 cancel_delayed_work_sync(&priv->lec_arp_work);
1482
1483 /*
1484 * Remove all entries
1485 */
1486
1487 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1488 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1489 hlist_for_each_entry_safe(entry, next,
1490 &priv->lec_arp_tables[i], next) {
1491 lec_arp_remove(priv, entry);
1492 lec_arp_put(entry);
1493 }
1494 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1495 }
1496
1497 hlist_for_each_entry_safe(entry, next,
1498 &priv->lec_arp_empty_ones, next) {
1499 del_timer_sync(&entry->timer);
1500 lec_arp_clear_vccs(entry);
1501 hlist_del(&entry->next);
1502 lec_arp_put(entry);
1503 }
1504 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1505
1506 hlist_for_each_entry_safe(entry, next,
1507 &priv->lec_no_forward, next) {
1508 del_timer_sync(&entry->timer);
1509 lec_arp_clear_vccs(entry);
1510 hlist_del(&entry->next);
1511 lec_arp_put(entry);
1512 }
1513 INIT_HLIST_HEAD(&priv->lec_no_forward);
1514
1515 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1516 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1517 lec_arp_clear_vccs(entry);
1518 hlist_del(&entry->next);
1519 lec_arp_put(entry);
1520 }
1521 INIT_HLIST_HEAD(&priv->mcast_fwds);
1522 priv->mcast_vcc = NULL;
1523 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1524 }
1525
1526 /*
1527 * Find entry by mac_address
1528 */
1529 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1530 const unsigned char *mac_addr)
1531 {
1532 struct hlist_head *head;
1533 struct lec_arp_table *entry;
1534
1535 pr_debug("%pM\n", mac_addr);
1536
1537 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1538 hlist_for_each_entry(entry, head, next) {
1539 if (ether_addr_equal(mac_addr, entry->mac_addr))
1540 return entry;
1541 }
1542 return NULL;
1543 }
1544
1545 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1546 const unsigned char *mac_addr)
1547 {
1548 struct lec_arp_table *to_return;
1549
1550 to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1551 if (!to_return) {
1552 pr_info("LEC: Arp entry kmalloc failed\n");
1553 return NULL;
1554 }
1555 ether_addr_copy(to_return->mac_addr, mac_addr);
1556 INIT_HLIST_NODE(&to_return->next);
1557 timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
1558 to_return->last_used = jiffies;
1559 to_return->priv = priv;
1560 skb_queue_head_init(&to_return->tx_wait);
1561 refcount_set(&to_return->usage, 1);
1562 return to_return;
1563 }
1564
1565 /* Arp sent timer expired */
1566 static void lec_arp_expire_arp(struct timer_list *t)
1567 {
1568 struct lec_arp_table *entry;
1569
1570 entry = from_timer(entry, t, timer);
1571
1572 pr_debug("\n");
1573 if (entry->status == ESI_ARP_PENDING) {
1574 if (entry->no_tries <= entry->priv->max_retry_count) {
1575 if (entry->is_rdesc)
1576 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1577 entry->mac_addr, NULL, NULL);
1578 else
1579 send_to_lecd(entry->priv, l_arp_xmt,
1580 entry->mac_addr, NULL, NULL);
1581 entry->no_tries++;
1582 }
1583 mod_timer(&entry->timer, jiffies + (1 * HZ));
1584 }
1585 }
1586
1587 /* Unknown/unused vcc expire, remove associated entry */
1588 static void lec_arp_expire_vcc(struct timer_list *t)
1589 {
1590 unsigned long flags;
1591 struct lec_arp_table *to_remove = from_timer(to_remove, t, timer);
1592 struct lec_priv *priv = to_remove->priv;
1593
1594 del_timer(&to_remove->timer);
1595
1596 pr_debug("%p %p: vpi:%d vci:%d\n",
1597 to_remove, priv,
1598 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1599 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1600
1601 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1602 hlist_del(&to_remove->next);
1603 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1604
1605 lec_arp_clear_vccs(to_remove);
1606 lec_arp_put(to_remove);
1607 }
1608
1609 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1610 unsigned long now,
1611 struct lec_priv *priv)
1612 {
1613 unsigned long time_to_check;
1614
1615 if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1616 time_to_check = priv->forward_delay_time;
1617 else
1618 time_to_check = priv->aging_time;
1619
1620 pr_debug("About to expire: %lx - %lx > %lx\n",
1621 now, entry->last_used, time_to_check);
1622 if (time_after(now, entry->last_used + time_to_check) &&
1623 !(entry->flags & LEC_PERMANENT_FLAG) &&
1624 !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */
1625 /* Remove entry */
1626 pr_debug("Entry timed out\n");
1627 lec_arp_remove(priv, entry);
1628 lec_arp_put(entry);
1629 } else {
1630 /* Something else */
1631 if ((entry->status == ESI_VC_PENDING ||
1632 entry->status == ESI_ARP_PENDING) &&
1633 time_after_eq(now, entry->timestamp +
1634 priv->max_unknown_frame_time)) {
1635 entry->timestamp = jiffies;
1636 entry->packets_flooded = 0;
1637 if (entry->status == ESI_VC_PENDING)
1638 send_to_lecd(priv, l_svc_setup,
1639 entry->mac_addr,
1640 entry->atm_addr,
1641 NULL);
1642 }
1643 if (entry->status == ESI_FLUSH_PENDING &&
1644 time_after_eq(now, entry->timestamp +
1645 priv->path_switching_delay)) {
1646 lec_arp_hold(entry);
1647 return true;
1648 }
1649 }
1650
1651 return false;
1652 }
1653 /*
1654 * Expire entries.
1655 * 1. Re-set timer
1656 * 2. For each entry, delete entries that have aged past the age limit.
1657 * 3. For each entry, depending on the status of the entry, perform
1658 * the following maintenance.
1659 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1660 * tick_count is above the max_unknown_frame_time, clear
1661 * the tick_count to zero and clear the packets_flooded counter
1662 * to zero. This supports the packet rate limit per address
1663 * while flooding unknowns.
1664 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1665 * than or equal to the path_switching_delay, change the status
1666 * to ESI_FORWARD_DIRECT. This causes the flush period to end
1667 * regardless of the progress of the flush protocol.
1668 */
1669 static void lec_arp_check_expire(struct work_struct *work)
1670 {
1671 unsigned long flags;
1672 struct lec_priv *priv =
1673 container_of(work, struct lec_priv, lec_arp_work.work);
1674 struct hlist_node *next;
1675 struct lec_arp_table *entry;
1676 unsigned long now;
1677 int i;
1678
1679 pr_debug("%p\n", priv);
1680 now = jiffies;
1681 restart:
1682 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1683 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1684 hlist_for_each_entry_safe(entry, next,
1685 &priv->lec_arp_tables[i], next) {
1686 if (__lec_arp_check_expire(entry, now, priv)) {
1687 struct sk_buff *skb;
1688 struct atm_vcc *vcc = entry->vcc;
1689
1690 spin_unlock_irqrestore(&priv->lec_arp_lock,
1691 flags);
1692 while ((skb = skb_dequeue(&entry->tx_wait)))
1693 lec_send(vcc, skb);
1694 entry->last_used = jiffies;
1695 entry->status = ESI_FORWARD_DIRECT;
1696 lec_arp_put(entry);
1697
1698 goto restart;
1699 }
1700 }
1701 }
1702 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1703
1704 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1705 }
1706
1707 /*
1708 * Try to find vcc where mac_address is attached.
1709 *
1710 */
1711 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1712 const unsigned char *mac_to_find,
1713 int is_rdesc,
1714 struct lec_arp_table **ret_entry)
1715 {
1716 unsigned long flags;
1717 struct lec_arp_table *entry;
1718 struct atm_vcc *found;
1719
1720 if (mac_to_find[0] & 0x01) {
1721 switch (priv->lane_version) {
1722 case 1:
1723 return priv->mcast_vcc;
1724 case 2: /* LANE2 wants arp for multicast addresses */
1725 if (ether_addr_equal(mac_to_find, bus_mac))
1726 return priv->mcast_vcc;
1727 break;
1728 default:
1729 break;
1730 }
1731 }
1732
1733 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1734 entry = lec_arp_find(priv, mac_to_find);
1735
1736 if (entry) {
1737 if (entry->status == ESI_FORWARD_DIRECT) {
1738 /* Connection Ok */
1739 entry->last_used = jiffies;
1740 lec_arp_hold(entry);
1741 *ret_entry = entry;
1742 found = entry->vcc;
1743 goto out;
1744 }
1745 /*
1746 * If the LE_ARP cache entry is still pending, reset count to 0
1747 * so another LE_ARP request can be made for this frame.
1748 */
1749 if (entry->status == ESI_ARP_PENDING)
1750 entry->no_tries = 0;
1751 /*
1752 * Data direct VC not yet set up, check to see if the unknown
1753 * frame count is greater than the limit. If the limit has
1754 * not been reached, allow the caller to send packet to
1755 * BUS.
1756 */
1757 if (entry->status != ESI_FLUSH_PENDING &&
1758 entry->packets_flooded <
1759 priv->maximum_unknown_frame_count) {
1760 entry->packets_flooded++;
1761 pr_debug("Flooding..\n");
1762 found = priv->mcast_vcc;
1763 goto out;
1764 }
1765 /*
1766 * We got here because entry->status == ESI_FLUSH_PENDING
1767 * or BUS flood limit was reached for an entry which is
1768 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1769 */
1770 lec_arp_hold(entry);
1771 *ret_entry = entry;
1772 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1773 entry->vcc);
1774 found = NULL;
1775 } else {
1776 /* No matching entry was found */
1777 entry = make_entry(priv, mac_to_find);
1778 pr_debug("Making entry\n");
1779 if (!entry) {
1780 found = priv->mcast_vcc;
1781 goto out;
1782 }
1783 lec_arp_add(priv, entry);
1784 /* We want arp-request(s) to be sent */
1785 entry->packets_flooded = 1;
1786 entry->status = ESI_ARP_PENDING;
1787 entry->no_tries = 1;
1788 entry->last_used = entry->timestamp = jiffies;
1789 entry->is_rdesc = is_rdesc;
1790 if (entry->is_rdesc)
1791 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1792 NULL);
1793 else
1794 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1795 entry->timer.expires = jiffies + (1 * HZ);
1796 entry->timer.function = lec_arp_expire_arp;
1797 add_timer(&entry->timer);
1798 found = priv->mcast_vcc;
1799 }
1800
1801 out:
1802 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1803 return found;
1804 }
1805
1806 static int
1807 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1808 unsigned long permanent)
1809 {
1810 unsigned long flags;
1811 struct hlist_node *next;
1812 struct lec_arp_table *entry;
1813 int i;
1814
1815 pr_debug("\n");
1816 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1817 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1818 hlist_for_each_entry_safe(entry, next,
1819 &priv->lec_arp_tables[i], next) {
1820 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1821 (permanent ||
1822 !(entry->flags & LEC_PERMANENT_FLAG))) {
1823 lec_arp_remove(priv, entry);
1824 lec_arp_put(entry);
1825 }
1826 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1827 return 0;
1828 }
1829 }
1830 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1831 return -1;
1832 }
1833
1834 /*
1835 * Notifies: Response to arp_request (atm_addr != NULL)
1836 */
1837 static void
1838 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1839 const unsigned char *atm_addr, unsigned long remoteflag,
1840 unsigned int targetless_le_arp)
1841 {
1842 unsigned long flags;
1843 struct hlist_node *next;
1844 struct lec_arp_table *entry, *tmp;
1845 int i;
1846
1847 pr_debug("%smac:%pM\n",
1848 (targetless_le_arp) ? "targetless " : "", mac_addr);
1849
1850 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1851 entry = lec_arp_find(priv, mac_addr);
1852 if (entry == NULL && targetless_le_arp)
1853 goto out; /*
1854 * LANE2: ignore targetless LE_ARPs for which
1855 * we have no entry in the cache. 7.1.30
1856 */
1857 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1858 hlist_for_each_entry_safe(entry, next,
1859 &priv->lec_arp_empty_ones, next) {
1860 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1861 hlist_del(&entry->next);
1862 del_timer(&entry->timer);
1863 tmp = lec_arp_find(priv, mac_addr);
1864 if (tmp) {
1865 del_timer(&tmp->timer);
1866 tmp->status = ESI_FORWARD_DIRECT;
1867 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1868 tmp->vcc = entry->vcc;
1869 tmp->old_push = entry->old_push;
1870 tmp->last_used = jiffies;
1871 del_timer(&entry->timer);
1872 lec_arp_put(entry);
1873 entry = tmp;
1874 } else {
1875 entry->status = ESI_FORWARD_DIRECT;
1876 ether_addr_copy(entry->mac_addr,
1877 mac_addr);
1878 entry->last_used = jiffies;
1879 lec_arp_add(priv, entry);
1880 }
1881 if (remoteflag)
1882 entry->flags |= LEC_REMOTE_FLAG;
1883 else
1884 entry->flags &= ~LEC_REMOTE_FLAG;
1885 pr_debug("After update\n");
1886 dump_arp_table(priv);
1887 goto out;
1888 }
1889 }
1890 }
1891
1892 entry = lec_arp_find(priv, mac_addr);
1893 if (!entry) {
1894 entry = make_entry(priv, mac_addr);
1895 if (!entry)
1896 goto out;
1897 entry->status = ESI_UNKNOWN;
1898 lec_arp_add(priv, entry);
1899 /* Temporary, changes before end of function */
1900 }
1901 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1902 del_timer(&entry->timer);
1903 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1904 hlist_for_each_entry(tmp,
1905 &priv->lec_arp_tables[i], next) {
1906 if (entry != tmp &&
1907 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1908 /* Vcc to this host exists */
1909 if (tmp->status > ESI_VC_PENDING) {
1910 /*
1911 * ESI_FLUSH_PENDING,
1912 * ESI_FORWARD_DIRECT
1913 */
1914 entry->vcc = tmp->vcc;
1915 entry->old_push = tmp->old_push;
1916 }
1917 entry->status = tmp->status;
1918 break;
1919 }
1920 }
1921 }
1922 if (remoteflag)
1923 entry->flags |= LEC_REMOTE_FLAG;
1924 else
1925 entry->flags &= ~LEC_REMOTE_FLAG;
1926 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1927 entry->status = ESI_VC_PENDING;
1928 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1929 }
1930 pr_debug("After update2\n");
1931 dump_arp_table(priv);
1932 out:
1933 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1934 }
1935
1936 /*
1937 * Notifies: Vcc setup ready
1938 */
1939 static void
1940 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1941 struct atm_vcc *vcc,
1942 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1943 {
1944 unsigned long flags;
1945 struct lec_arp_table *entry;
1946 int i, found_entry = 0;
1947
1948 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1949 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1950 if (ioc_data->receive == 2) {
1951 pr_debug("LEC_ARP: Attaching mcast forward\n");
1952 #if 0
1953 entry = lec_arp_find(priv, bus_mac);
1954 if (!entry) {
1955 pr_info("LEC_ARP: Multicast entry not found!\n");
1956 goto out;
1957 }
1958 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1959 entry->recv_vcc = vcc;
1960 entry->old_recv_push = old_push;
1961 #endif
1962 entry = make_entry(priv, bus_mac);
1963 if (entry == NULL)
1964 goto out;
1965 del_timer(&entry->timer);
1966 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1967 entry->recv_vcc = vcc;
1968 entry->old_recv_push = old_push;
1969 hlist_add_head(&entry->next, &priv->mcast_fwds);
1970 goto out;
1971 } else if (ioc_data->receive == 1) {
1972 /*
1973 * Vcc which we don't want to make default vcc,
1974 * attach it anyway.
1975 */
1976 pr_debug("LEC_ARP:Attaching data direct, not default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
1977 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1978 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1979 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
1980 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
1981 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
1982 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
1983 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
1984 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
1985 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
1986 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
1987 entry = make_entry(priv, bus_mac);
1988 if (entry == NULL)
1989 goto out;
1990 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1991 eth_zero_addr(entry->mac_addr);
1992 entry->recv_vcc = vcc;
1993 entry->old_recv_push = old_push;
1994 entry->status = ESI_UNKNOWN;
1995 entry->timer.expires = jiffies + priv->vcc_timeout_period;
1996 entry->timer.function = lec_arp_expire_vcc;
1997 hlist_add_head(&entry->next, &priv->lec_no_forward);
1998 add_timer(&entry->timer);
1999 dump_arp_table(priv);
2000 goto out;
2001 }
2002 pr_debug("LEC_ARP:Attaching data direct, default: %2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x\n",
2003 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2004 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2005 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2006 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2007 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2008 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2009 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2010 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2011 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2012 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2013 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2014 hlist_for_each_entry(entry,
2015 &priv->lec_arp_tables[i], next) {
2016 if (memcmp
2017 (ioc_data->atm_addr, entry->atm_addr,
2018 ATM_ESA_LEN) == 0) {
2019 pr_debug("LEC_ARP: Attaching data direct\n");
2020 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2021 entry->vcc ? entry->vcc->vci : 0,
2022 entry->recv_vcc ? entry->recv_vcc->
2023 vci : 0);
2024 found_entry = 1;
2025 del_timer(&entry->timer);
2026 entry->vcc = vcc;
2027 entry->old_push = old_push;
2028 if (entry->status == ESI_VC_PENDING) {
2029 if (priv->maximum_unknown_frame_count
2030 == 0)
2031 entry->status =
2032 ESI_FORWARD_DIRECT;
2033 else {
2034 entry->timestamp = jiffies;
2035 entry->status =
2036 ESI_FLUSH_PENDING;
2037 #if 0
2038 send_to_lecd(priv, l_flush_xmt,
2039 NULL,
2040 entry->atm_addr,
2041 NULL);
2042 #endif
2043 }
2044 } else {
2045 /*
2046 * They were forming a connection
2047 * to us, and we to them. Our
2048 * ATM address is numerically lower
2049 * than theirs, so we make connection
2050 * we formed into default VCC (8.1.11).
2051 * Connection they made gets torn
2052 * down. This might confuse some
2053 * clients. Can be changed if
2054 * someone reports trouble...
2055 */
2056 ;
2057 }
2058 }
2059 }
2060 }
2061 if (found_entry) {
2062 pr_debug("After vcc was added\n");
2063 dump_arp_table(priv);
2064 goto out;
2065 }
2066 /*
2067 * Not found, snatch address from first data packet that arrives
2068 * from this vcc
2069 */
2070 entry = make_entry(priv, bus_mac);
2071 if (!entry)
2072 goto out;
2073 entry->vcc = vcc;
2074 entry->old_push = old_push;
2075 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2076 eth_zero_addr(entry->mac_addr);
2077 entry->status = ESI_UNKNOWN;
2078 hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2079 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2080 entry->timer.function = lec_arp_expire_vcc;
2081 add_timer(&entry->timer);
2082 pr_debug("After vcc was added\n");
2083 dump_arp_table(priv);
2084 out:
2085 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2086 }
2087
2088 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2089 {
2090 unsigned long flags;
2091 struct lec_arp_table *entry;
2092 int i;
2093
2094 pr_debug("%lx\n", tran_id);
2095 restart:
2096 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2097 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2098 hlist_for_each_entry(entry,
2099 &priv->lec_arp_tables[i], next) {
2100 if (entry->flush_tran_id == tran_id &&
2101 entry->status == ESI_FLUSH_PENDING) {
2102 struct sk_buff *skb;
2103 struct atm_vcc *vcc = entry->vcc;
2104
2105 lec_arp_hold(entry);
2106 spin_unlock_irqrestore(&priv->lec_arp_lock,
2107 flags);
2108 while ((skb = skb_dequeue(&entry->tx_wait)))
2109 lec_send(vcc, skb);
2110 entry->last_used = jiffies;
2111 entry->status = ESI_FORWARD_DIRECT;
2112 lec_arp_put(entry);
2113 pr_debug("LEC_ARP: Flushed\n");
2114 goto restart;
2115 }
2116 }
2117 }
2118 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2119 dump_arp_table(priv);
2120 }
2121
2122 static void
2123 lec_set_flush_tran_id(struct lec_priv *priv,
2124 const unsigned char *atm_addr, unsigned long tran_id)
2125 {
2126 unsigned long flags;
2127 struct lec_arp_table *entry;
2128 int i;
2129
2130 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2131 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2132 hlist_for_each_entry(entry,
2133 &priv->lec_arp_tables[i], next) {
2134 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2135 entry->flush_tran_id = tran_id;
2136 pr_debug("Set flush transaction id to %lx for %p\n",
2137 tran_id, entry);
2138 }
2139 }
2140 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2141 }
2142
2143 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2144 {
2145 unsigned long flags;
2146 unsigned char mac_addr[] = {
2147 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2148 };
2149 struct lec_arp_table *to_add;
2150 struct lec_vcc_priv *vpriv;
2151 int err = 0;
2152
2153 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2154 if (!vpriv)
2155 return -ENOMEM;
2156 vpriv->xoff = 0;
2157 vpriv->old_pop = vcc->pop;
2158 vcc->user_back = vpriv;
2159 vcc->pop = lec_pop;
2160 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2161 to_add = make_entry(priv, mac_addr);
2162 if (!to_add) {
2163 vcc->pop = vpriv->old_pop;
2164 kfree(vpriv);
2165 err = -ENOMEM;
2166 goto out;
2167 }
2168 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2169 to_add->status = ESI_FORWARD_DIRECT;
2170 to_add->flags |= LEC_PERMANENT_FLAG;
2171 to_add->vcc = vcc;
2172 to_add->old_push = vcc->push;
2173 vcc->push = lec_push;
2174 priv->mcast_vcc = vcc;
2175 lec_arp_add(priv, to_add);
2176 out:
2177 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2178 return err;
2179 }
2180
2181 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2182 {
2183 unsigned long flags;
2184 struct hlist_node *next;
2185 struct lec_arp_table *entry;
2186 int i;
2187
2188 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2189 dump_arp_table(priv);
2190
2191 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2192
2193 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2194 hlist_for_each_entry_safe(entry, next,
2195 &priv->lec_arp_tables[i], next) {
2196 if (vcc == entry->vcc) {
2197 lec_arp_remove(priv, entry);
2198 lec_arp_put(entry);
2199 if (priv->mcast_vcc == vcc)
2200 priv->mcast_vcc = NULL;
2201 }
2202 }
2203 }
2204
2205 hlist_for_each_entry_safe(entry, next,
2206 &priv->lec_arp_empty_ones, next) {
2207 if (entry->vcc == vcc) {
2208 lec_arp_clear_vccs(entry);
2209 del_timer(&entry->timer);
2210 hlist_del(&entry->next);
2211 lec_arp_put(entry);
2212 }
2213 }
2214
2215 hlist_for_each_entry_safe(entry, next,
2216 &priv->lec_no_forward, next) {
2217 if (entry->recv_vcc == vcc) {
2218 lec_arp_clear_vccs(entry);
2219 del_timer(&entry->timer);
2220 hlist_del(&entry->next);
2221 lec_arp_put(entry);
2222 }
2223 }
2224
2225 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2226 if (entry->recv_vcc == vcc) {
2227 lec_arp_clear_vccs(entry);
2228 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2229 hlist_del(&entry->next);
2230 lec_arp_put(entry);
2231 }
2232 }
2233
2234 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2235 dump_arp_table(priv);
2236 }
2237
2238 static void
2239 lec_arp_check_empties(struct lec_priv *priv,
2240 struct atm_vcc *vcc, struct sk_buff *skb)
2241 {
2242 unsigned long flags;
2243 struct hlist_node *next;
2244 struct lec_arp_table *entry, *tmp;
2245 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2246 unsigned char *src = hdr->h_source;
2247
2248 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2249 hlist_for_each_entry_safe(entry, next,
2250 &priv->lec_arp_empty_ones, next) {
2251 if (vcc == entry->vcc) {
2252 del_timer(&entry->timer);
2253 ether_addr_copy(entry->mac_addr, src);
2254 entry->status = ESI_FORWARD_DIRECT;
2255 entry->last_used = jiffies;
2256 /* We might have got an entry */
2257 tmp = lec_arp_find(priv, src);
2258 if (tmp) {
2259 lec_arp_remove(priv, tmp);
2260 lec_arp_put(tmp);
2261 }
2262 hlist_del(&entry->next);
2263 lec_arp_add(priv, entry);
2264 goto out;
2265 }
2266 }
2267 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2268 out:
2269 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2270 }
2271
2272 MODULE_LICENSE("GPL");
Linux with added FPC-III support