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Linux 4.19.133
[linux/fpc-iii.git] / net / atm / lec.c
blobad4f829193f053c8a0c0846f1e9f619617dcd18e
1 /*
2 * lec.c: Lan Emulation driver
3 *
4 * Marko Kiiskila <mkiiskila@yahoo.com>
5 */
6
7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
8
9 #include <linux/slab.h>
10 #include <linux/kernel.h>
11 #include <linux/bitops.h>
12 #include <linux/capability.h>
13
14 /* We are ethernet device */
15 #include <linux/if_ether.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <net/sock.h>
19 #include <linux/skbuff.h>
20 #include <linux/ip.h>
21 #include <asm/byteorder.h>
22 #include <linux/uaccess.h>
23 #include <net/arp.h>
24 #include <net/dst.h>
25 #include <linux/proc_fs.h>
26 #include <linux/spinlock.h>
27 #include <linux/seq_file.h>
28
29 /* And atm device */
30 #include <linux/atmdev.h>
31 #include <linux/atmlec.h>
32
33 /* Proxy LEC knows about bridging */
34 #if IS_ENABLED(CONFIG_BRIDGE)
35 #include "../bridge/br_private.h"
36
37 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
38 #endif
39
40 /* Modular too */
41 #include <linux/module.h>
42 #include <linux/init.h>
43
44 /* Hardening for Spectre-v1 */
45 #include <linux/nospec.h>
46
47 #include "lec.h"
48 #include "lec_arpc.h"
49 #include "resources.h"
50
51 #define DUMP_PACKETS 0 /*
52 * 0 = None,
53 * 1 = 30 first bytes
54 * 2 = Whole packet
55 */
56
57 #define LEC_UNRES_QUE_LEN 8 /*
58 * number of tx packets to queue for a
59 * single destination while waiting for SVC
60 */
61
62 static int lec_open(struct net_device *dev);
63 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
64 struct net_device *dev);
65 static int lec_close(struct net_device *dev);
66 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
67 const unsigned char *mac_addr);
68 static int lec_arp_remove(struct lec_priv *priv,
69 struct lec_arp_table *to_remove);
70 /* LANE2 functions */
71 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
72 const u8 *tlvs, u32 sizeoftlvs);
73 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
74 u8 **tlvs, u32 *sizeoftlvs);
75 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
76 const u8 *tlvs, u32 sizeoftlvs);
77
78 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
79 unsigned long permanent);
80 static void lec_arp_check_empties(struct lec_priv *priv,
81 struct atm_vcc *vcc, struct sk_buff *skb);
82 static void lec_arp_destroy(struct lec_priv *priv);
83 static void lec_arp_init(struct lec_priv *priv);
84 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
85 const unsigned char *mac_to_find,
86 int is_rdesc,
87 struct lec_arp_table **ret_entry);
88 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
89 const unsigned char *atm_addr,
90 unsigned long remoteflag,
91 unsigned int targetless_le_arp);
92 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
93 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
94 static void lec_set_flush_tran_id(struct lec_priv *priv,
95 const unsigned char *atm_addr,
96 unsigned long tran_id);
97 static void lec_vcc_added(struct lec_priv *priv,
98 const struct atmlec_ioc *ioc_data,
99 struct atm_vcc *vcc,
100 void (*old_push)(struct atm_vcc *vcc,
101 struct sk_buff *skb));
102 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
103
104 /* must be done under lec_arp_lock */
105 static inline void lec_arp_hold(struct lec_arp_table *entry)
106 {
107 refcount_inc(&entry->usage);
108 }
109
110 static inline void lec_arp_put(struct lec_arp_table *entry)
111 {
112 if (refcount_dec_and_test(&entry->usage))
113 kfree(entry);
114 }
115
116 static struct lane2_ops lane2_ops = {
117 .resolve = lane2_resolve, /* spec 3.1.3 */
118 .associate_req = lane2_associate_req, /* spec 3.1.4 */
119 .associate_indicator = NULL /* spec 3.1.5 */
120 };
121
122 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
123
124 /* Device structures */
125 static struct net_device *dev_lec[MAX_LEC_ITF];
126
127 #if IS_ENABLED(CONFIG_BRIDGE)
128 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
129 {
130 char *buff;
131 struct lec_priv *priv;
132
133 /*
134 * Check if this is a BPDU. If so, ask zeppelin to send
135 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
136 * as the Config BPDU has
137 */
138 buff = skb->data + skb->dev->hard_header_len;
139 if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
140 struct sock *sk;
141 struct sk_buff *skb2;
142 struct atmlec_msg *mesg;
143
144 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
145 if (skb2 == NULL)
146 return;
147 skb2->len = sizeof(struct atmlec_msg);
148 mesg = (struct atmlec_msg *)skb2->data;
149 mesg->type = l_topology_change;
150 buff += 4;
151 mesg->content.normal.flag = *buff & 0x01;
152 /* 0x01 is topology change */
153
154 priv = netdev_priv(dev);
155 atm_force_charge(priv->lecd, skb2->truesize);
156 sk = sk_atm(priv->lecd);
157 skb_queue_tail(&sk->sk_receive_queue, skb2);
158 sk->sk_data_ready(sk);
159 }
160 }
161 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
162
163 /*
164 * Open/initialize the netdevice. This is called (in the current kernel)
165 * sometime after booting when the 'ifconfig' program is run.
166 *
167 * This routine should set everything up anew at each open, even
168 * registers that "should" only need to be set once at boot, so that
169 * there is non-reboot way to recover if something goes wrong.
170 */
171
172 static int lec_open(struct net_device *dev)
173 {
174 netif_start_queue(dev);
175
176 return 0;
177 }
178
179 static void
180 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
181 {
182 struct net_device *dev = skb->dev;
183
184 ATM_SKB(skb)->vcc = vcc;
185 atm_account_tx(vcc, skb);
186
187 if (vcc->send(vcc, skb) < 0) {
188 dev->stats.tx_dropped++;
189 return;
190 }
191
192 dev->stats.tx_packets++;
193 dev->stats.tx_bytes += skb->len;
194 }
195
196 static void lec_tx_timeout(struct net_device *dev)
197 {
198 pr_info("%s\n", dev->name);
199 netif_trans_update(dev);
200 netif_wake_queue(dev);
201 }
202
203 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
204 struct net_device *dev)
205 {
206 struct sk_buff *skb2;
207 struct lec_priv *priv = netdev_priv(dev);
208 struct lecdatahdr_8023 *lec_h;
209 struct atm_vcc *vcc;
210 struct lec_arp_table *entry;
211 unsigned char *dst;
212 int min_frame_size;
213 int is_rdesc;
214
215 pr_debug("called\n");
216 if (!priv->lecd) {
217 pr_info("%s:No lecd attached\n", dev->name);
218 dev->stats.tx_errors++;
219 netif_stop_queue(dev);
220 kfree_skb(skb);
221 return NETDEV_TX_OK;
222 }
223
224 pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
225 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
226 (long)skb_end_pointer(skb));
227 #if IS_ENABLED(CONFIG_BRIDGE)
228 if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
229 lec_handle_bridge(skb, dev);
230 #endif
231
232 /* Make sure we have room for lec_id */
233 if (skb_headroom(skb) < 2) {
234 pr_debug("reallocating skb\n");
235 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
236 if (unlikely(!skb2)) {
237 kfree_skb(skb);
238 return NETDEV_TX_OK;
239 }
240 consume_skb(skb);
241 skb = skb2;
242 }
243 skb_push(skb, 2);
244
245 /* Put le header to place */
246 lec_h = (struct lecdatahdr_8023 *)skb->data;
247 lec_h->le_header = htons(priv->lecid);
248
249 #if DUMP_PACKETS >= 2
250 #define MAX_DUMP_SKB 99
251 #elif DUMP_PACKETS >= 1
252 #define MAX_DUMP_SKB 30
253 #endif
254 #if DUMP_PACKETS >= 1
255 printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
256 dev->name, skb->len, priv->lecid);
257 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
258 skb->data, min(skb->len, MAX_DUMP_SKB), true);
259 #endif /* DUMP_PACKETS >= 1 */
260
261 /* Minimum ethernet-frame size */
262 min_frame_size = LEC_MINIMUM_8023_SIZE;
263 if (skb->len < min_frame_size) {
264 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
265 skb2 = skb_copy_expand(skb, 0,
266 min_frame_size - skb->truesize,
267 GFP_ATOMIC);
268 dev_kfree_skb(skb);
269 if (skb2 == NULL) {
270 dev->stats.tx_dropped++;
271 return NETDEV_TX_OK;
272 }
273 skb = skb2;
274 }
275 skb_put(skb, min_frame_size - skb->len);
276 }
277
278 /* Send to right vcc */
279 is_rdesc = 0;
280 dst = lec_h->h_dest;
281 entry = NULL;
282 vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
283 pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
284 dev->name, vcc, vcc ? vcc->flags : 0, entry);
285 if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
286 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
287 pr_debug("%s:queuing packet, MAC address %pM\n",
288 dev->name, lec_h->h_dest);
289 skb_queue_tail(&entry->tx_wait, skb);
290 } else {
291 pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
292 dev->name, lec_h->h_dest);
293 dev->stats.tx_dropped++;
294 dev_kfree_skb(skb);
295 }
296 goto out;
297 }
298 #if DUMP_PACKETS > 0
299 printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
300 dev->name, vcc->vpi, vcc->vci);
301 #endif /* DUMP_PACKETS > 0 */
302
303 while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
304 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
305 lec_send(vcc, skb2);
306 }
307
308 lec_send(vcc, skb);
309
310 if (!atm_may_send(vcc, 0)) {
311 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
312
313 vpriv->xoff = 1;
314 netif_stop_queue(dev);
315
316 /*
317 * vcc->pop() might have occurred in between, making
318 * the vcc usuable again. Since xmit is serialized,
319 * this is the only situation we have to re-test.
320 */
321
322 if (atm_may_send(vcc, 0))
323 netif_wake_queue(dev);
324 }
325
326 out:
327 if (entry)
328 lec_arp_put(entry);
329 netif_trans_update(dev);
330 return NETDEV_TX_OK;
331 }
332
333 /* The inverse routine to net_open(). */
334 static int lec_close(struct net_device *dev)
335 {
336 netif_stop_queue(dev);
337 return 0;
338 }
339
340 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
341 {
342 unsigned long flags;
343 struct net_device *dev = (struct net_device *)vcc->proto_data;
344 struct lec_priv *priv = netdev_priv(dev);
345 struct atmlec_msg *mesg;
346 struct lec_arp_table *entry;
347 int i;
348 char *tmp; /* FIXME */
349
350 WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
351 mesg = (struct atmlec_msg *)skb->data;
352 tmp = skb->data;
353 tmp += sizeof(struct atmlec_msg);
354 pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
355 switch (mesg->type) {
356 case l_set_mac_addr:
357 for (i = 0; i < 6; i++)
358 dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
359 break;
360 case l_del_mac_addr:
361 for (i = 0; i < 6; i++)
362 dev->dev_addr[i] = 0;
363 break;
364 case l_addr_delete:
365 lec_addr_delete(priv, mesg->content.normal.atm_addr,
366 mesg->content.normal.flag);
367 break;
368 case l_topology_change:
369 priv->topology_change = mesg->content.normal.flag;
370 break;
371 case l_flush_complete:
372 lec_flush_complete(priv, mesg->content.normal.flag);
373 break;
374 case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */
375 spin_lock_irqsave(&priv->lec_arp_lock, flags);
376 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
377 lec_arp_remove(priv, entry);
378 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
379
380 if (mesg->content.normal.no_source_le_narp)
381 break;
382 /* FALL THROUGH */
383 case l_arp_update:
384 lec_arp_update(priv, mesg->content.normal.mac_addr,
385 mesg->content.normal.atm_addr,
386 mesg->content.normal.flag,
387 mesg->content.normal.targetless_le_arp);
388 pr_debug("in l_arp_update\n");
389 if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */
390 pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
391 mesg->sizeoftlvs);
392 lane2_associate_ind(dev, mesg->content.normal.mac_addr,
393 tmp, mesg->sizeoftlvs);
394 }
395 break;
396 case l_config:
397 priv->maximum_unknown_frame_count =
398 mesg->content.config.maximum_unknown_frame_count;
399 priv->max_unknown_frame_time =
400 (mesg->content.config.max_unknown_frame_time * HZ);
401 priv->max_retry_count = mesg->content.config.max_retry_count;
402 priv->aging_time = (mesg->content.config.aging_time * HZ);
403 priv->forward_delay_time =
404 (mesg->content.config.forward_delay_time * HZ);
405 priv->arp_response_time =
406 (mesg->content.config.arp_response_time * HZ);
407 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
408 priv->path_switching_delay =
409 (mesg->content.config.path_switching_delay * HZ);
410 priv->lane_version = mesg->content.config.lane_version;
411 /* LANE2 */
412 priv->lane2_ops = NULL;
413 if (priv->lane_version > 1)
414 priv->lane2_ops = &lane2_ops;
415 rtnl_lock();
416 if (dev_set_mtu(dev, mesg->content.config.mtu))
417 pr_info("%s: change_mtu to %d failed\n",
418 dev->name, mesg->content.config.mtu);
419 rtnl_unlock();
420 priv->is_proxy = mesg->content.config.is_proxy;
421 break;
422 case l_flush_tran_id:
423 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
424 mesg->content.normal.flag);
425 break;
426 case l_set_lecid:
427 priv->lecid =
428 (unsigned short)(0xffff & mesg->content.normal.flag);
429 break;
430 case l_should_bridge:
431 #if IS_ENABLED(CONFIG_BRIDGE)
432 {
433 pr_debug("%s: bridge zeppelin asks about %pM\n",
434 dev->name, mesg->content.proxy.mac_addr);
435
436 if (br_fdb_test_addr_hook == NULL)
437 break;
438
439 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
440 /* hit from bridge table, send LE_ARP_RESPONSE */
441 struct sk_buff *skb2;
442 struct sock *sk;
443
444 pr_debug("%s: entry found, responding to zeppelin\n",
445 dev->name);
446 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
447 if (skb2 == NULL)
448 break;
449 skb2->len = sizeof(struct atmlec_msg);
450 skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
451 atm_force_charge(priv->lecd, skb2->truesize);
452 sk = sk_atm(priv->lecd);
453 skb_queue_tail(&sk->sk_receive_queue, skb2);
454 sk->sk_data_ready(sk);
455 }
456 }
457 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
458 break;
459 default:
460 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
461 dev_kfree_skb(skb);
462 return -EINVAL;
463 }
464 dev_kfree_skb(skb);
465 return 0;
466 }
467
468 static void lec_atm_close(struct atm_vcc *vcc)
469 {
470 struct sk_buff *skb;
471 struct net_device *dev = (struct net_device *)vcc->proto_data;
472 struct lec_priv *priv = netdev_priv(dev);
473
474 priv->lecd = NULL;
475 /* Do something needful? */
476
477 netif_stop_queue(dev);
478 lec_arp_destroy(priv);
479
480 if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
481 pr_info("%s closing with messages pending\n", dev->name);
482 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
483 atm_return(vcc, skb->truesize);
484 dev_kfree_skb(skb);
485 }
486
487 pr_info("%s: Shut down!\n", dev->name);
488 module_put(THIS_MODULE);
489 }
490
491 static const struct atmdev_ops lecdev_ops = {
492 .close = lec_atm_close,
493 .send = lec_atm_send
494 };
495
496 static struct atm_dev lecatm_dev = {
497 .ops = &lecdev_ops,
498 .type = "lec",
499 .number = 999, /* dummy device number */
500 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
501 };
502
503 /*
504 * LANE2: new argument struct sk_buff *data contains
505 * the LE_ARP based TLVs introduced in the LANE2 spec
506 */
507 static int
508 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
509 const unsigned char *mac_addr, const unsigned char *atm_addr,
510 struct sk_buff *data)
511 {
512 struct sock *sk;
513 struct sk_buff *skb;
514 struct atmlec_msg *mesg;
515
516 if (!priv || !priv->lecd)
517 return -1;
518 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
519 if (!skb)
520 return -1;
521 skb->len = sizeof(struct atmlec_msg);
522 mesg = (struct atmlec_msg *)skb->data;
523 memset(mesg, 0, sizeof(struct atmlec_msg));
524 mesg->type = type;
525 if (data != NULL)
526 mesg->sizeoftlvs = data->len;
527 if (mac_addr)
528 ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
529 else
530 mesg->content.normal.targetless_le_arp = 1;
531 if (atm_addr)
532 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
533
534 atm_force_charge(priv->lecd, skb->truesize);
535 sk = sk_atm(priv->lecd);
536 skb_queue_tail(&sk->sk_receive_queue, skb);
537 sk->sk_data_ready(sk);
538
539 if (data != NULL) {
540 pr_debug("about to send %d bytes of data\n", data->len);
541 atm_force_charge(priv->lecd, data->truesize);
542 skb_queue_tail(&sk->sk_receive_queue, data);
543 sk->sk_data_ready(sk);
544 }
545
546 return 0;
547 }
548
549 static void lec_set_multicast_list(struct net_device *dev)
550 {
551 /*
552 * by default, all multicast frames arrive over the bus.
553 * eventually support selective multicast service
554 */
555 }
556
557 static const struct net_device_ops lec_netdev_ops = {
558 .ndo_open = lec_open,
559 .ndo_stop = lec_close,
560 .ndo_start_xmit = lec_start_xmit,
561 .ndo_tx_timeout = lec_tx_timeout,
562 .ndo_set_rx_mode = lec_set_multicast_list,
563 };
564
565 static const unsigned char lec_ctrl_magic[] = {
566 0xff,
567 0x00,
568 0x01,
569 0x01
570 };
571
572 #define LEC_DATA_DIRECT_8023 2
573 #define LEC_DATA_DIRECT_8025 3
574
575 static int lec_is_data_direct(struct atm_vcc *vcc)
576 {
577 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
578 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
579 }
580
581 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
582 {
583 unsigned long flags;
584 struct net_device *dev = (struct net_device *)vcc->proto_data;
585 struct lec_priv *priv = netdev_priv(dev);
586
587 #if DUMP_PACKETS > 0
588 printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
589 dev->name, vcc->vpi, vcc->vci);
590 #endif
591 if (!skb) {
592 pr_debug("%s: null skb\n", dev->name);
593 lec_vcc_close(priv, vcc);
594 return;
595 }
596 #if DUMP_PACKETS >= 2
597 #define MAX_SKB_DUMP 99
598 #elif DUMP_PACKETS >= 1
599 #define MAX_SKB_DUMP 30
600 #endif
601 #if DUMP_PACKETS > 0
602 printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
603 dev->name, skb->len, priv->lecid);
604 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
605 skb->data, min(MAX_SKB_DUMP, skb->len), true);
606 #endif /* DUMP_PACKETS > 0 */
607 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
608 /* Control frame, to daemon */
609 struct sock *sk = sk_atm(vcc);
610
611 pr_debug("%s: To daemon\n", dev->name);
612 skb_queue_tail(&sk->sk_receive_queue, skb);
613 sk->sk_data_ready(sk);
614 } else { /* Data frame, queue to protocol handlers */
615 struct lec_arp_table *entry;
616 unsigned char *src, *dst;
617
618 atm_return(vcc, skb->truesize);
619 if (*(__be16 *) skb->data == htons(priv->lecid) ||
620 !priv->lecd || !(dev->flags & IFF_UP)) {
621 /*
622 * Probably looping back, or if lecd is missing,
623 * lecd has gone down
624 */
625 pr_debug("Ignoring frame...\n");
626 dev_kfree_skb(skb);
627 return;
628 }
629 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
630
631 /*
632 * If this is a Data Direct VCC, and the VCC does not match
633 * the LE_ARP cache entry, delete the LE_ARP cache entry.
634 */
635 spin_lock_irqsave(&priv->lec_arp_lock, flags);
636 if (lec_is_data_direct(vcc)) {
637 src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
638 entry = lec_arp_find(priv, src);
639 if (entry && entry->vcc != vcc) {
640 lec_arp_remove(priv, entry);
641 lec_arp_put(entry);
642 }
643 }
644 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
645
646 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
647 !priv->is_proxy && /* Proxy wants all the packets */
648 memcmp(dst, dev->dev_addr, dev->addr_len)) {
649 dev_kfree_skb(skb);
650 return;
651 }
652 if (!hlist_empty(&priv->lec_arp_empty_ones))
653 lec_arp_check_empties(priv, vcc, skb);
654 skb_pull(skb, 2); /* skip lec_id */
655 skb->protocol = eth_type_trans(skb, dev);
656 dev->stats.rx_packets++;
657 dev->stats.rx_bytes += skb->len;
658 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
659 netif_rx(skb);
660 }
661 }
662
663 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
664 {
665 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
666 struct net_device *dev = skb->dev;
667
668 if (vpriv == NULL) {
669 pr_info("vpriv = NULL!?!?!?\n");
670 return;
671 }
672
673 vpriv->old_pop(vcc, skb);
674
675 if (vpriv->xoff && atm_may_send(vcc, 0)) {
676 vpriv->xoff = 0;
677 if (netif_running(dev) && netif_queue_stopped(dev))
678 netif_wake_queue(dev);
679 }
680 }
681
682 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
683 {
684 struct lec_vcc_priv *vpriv;
685 int bytes_left;
686 struct atmlec_ioc ioc_data;
687
688 /* Lecd must be up in this case */
689 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
690 if (bytes_left != 0)
691 pr_info("copy from user failed for %d bytes\n", bytes_left);
692 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
693 return -EINVAL;
694 ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF);
695 if (!dev_lec[ioc_data.dev_num])
696 return -EINVAL;
697 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
698 if (!vpriv)
699 return -ENOMEM;
700 vpriv->xoff = 0;
701 vpriv->old_pop = vcc->pop;
702 vcc->user_back = vpriv;
703 vcc->pop = lec_pop;
704 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
705 &ioc_data, vcc, vcc->push);
706 vcc->proto_data = dev_lec[ioc_data.dev_num];
707 vcc->push = lec_push;
708 return 0;
709 }
710
711 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
712 {
713 if (arg < 0 || arg >= MAX_LEC_ITF)
714 return -EINVAL;
715 arg = array_index_nospec(arg, MAX_LEC_ITF);
716 if (!dev_lec[arg])
717 return -EINVAL;
718 vcc->proto_data = dev_lec[arg];
719 return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
720 }
721
722 /* Initialize device. */
723 static int lecd_attach(struct atm_vcc *vcc, int arg)
724 {
725 int i;
726 struct lec_priv *priv;
727
728 if (arg < 0)
729 i = 0;
730 else
731 i = arg;
732 if (arg >= MAX_LEC_ITF)
733 return -EINVAL;
734 i = array_index_nospec(arg, MAX_LEC_ITF);
735 if (!dev_lec[i]) {
736 int size;
737
738 size = sizeof(struct lec_priv);
739 dev_lec[i] = alloc_etherdev(size);
740 if (!dev_lec[i])
741 return -ENOMEM;
742 dev_lec[i]->netdev_ops = &lec_netdev_ops;
743 dev_lec[i]->max_mtu = 18190;
744 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
745 if (register_netdev(dev_lec[i])) {
746 free_netdev(dev_lec[i]);
747 return -EINVAL;
748 }
749
750 priv = netdev_priv(dev_lec[i]);
751 } else {
752 priv = netdev_priv(dev_lec[i]);
753 if (priv->lecd)
754 return -EADDRINUSE;
755 }
756 lec_arp_init(priv);
757 priv->itfnum = i; /* LANE2 addition */
758 priv->lecd = vcc;
759 vcc->dev = &lecatm_dev;
760 vcc_insert_socket(sk_atm(vcc));
761
762 vcc->proto_data = dev_lec[i];
763 set_bit(ATM_VF_META, &vcc->flags);
764 set_bit(ATM_VF_READY, &vcc->flags);
765
766 /* Set default values to these variables */
767 priv->maximum_unknown_frame_count = 1;
768 priv->max_unknown_frame_time = (1 * HZ);
769 priv->vcc_timeout_period = (1200 * HZ);
770 priv->max_retry_count = 1;
771 priv->aging_time = (300 * HZ);
772 priv->forward_delay_time = (15 * HZ);
773 priv->topology_change = 0;
774 priv->arp_response_time = (1 * HZ);
775 priv->flush_timeout = (4 * HZ);
776 priv->path_switching_delay = (6 * HZ);
777
778 if (dev_lec[i]->flags & IFF_UP)
779 netif_start_queue(dev_lec[i]);
780 __module_get(THIS_MODULE);
781 return i;
782 }
783
784 #ifdef CONFIG_PROC_FS
785 static const char *lec_arp_get_status_string(unsigned char status)
786 {
787 static const char *const lec_arp_status_string[] = {
788 "ESI_UNKNOWN ",
789 "ESI_ARP_PENDING ",
790 "ESI_VC_PENDING ",
791 "<Undefined> ",
792 "ESI_FLUSH_PENDING ",
793 "ESI_FORWARD_DIRECT"
794 };
795
796 if (status > ESI_FORWARD_DIRECT)
797 status = 3; /* ESI_UNDEFINED */
798 return lec_arp_status_string[status];
799 }
800
801 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
802 {
803 int i;
804
805 for (i = 0; i < ETH_ALEN; i++)
806 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
807 seq_printf(seq, " ");
808 for (i = 0; i < ATM_ESA_LEN; i++)
809 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
810 seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
811 entry->flags & 0xffff);
812 if (entry->vcc)
813 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
814 else
815 seq_printf(seq, " ");
816 if (entry->recv_vcc) {
817 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi,
818 entry->recv_vcc->vci);
819 }
820 seq_putc(seq, '\n');
821 }
822
823 struct lec_state {
824 unsigned long flags;
825 struct lec_priv *locked;
826 struct hlist_node *node;
827 struct net_device *dev;
828 int itf;
829 int arp_table;
830 int misc_table;
831 };
832
833 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
834 loff_t *l)
835 {
836 struct hlist_node *e = state->node;
837
838 if (!e)
839 e = tbl->first;
840 if (e == SEQ_START_TOKEN) {
841 e = tbl->first;
842 --*l;
843 }
844
845 for (; e; e = e->next) {
846 if (--*l < 0)
847 break;
848 }
849 state->node = e;
850
851 return (*l < 0) ? state : NULL;
852 }
853
854 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
855 struct lec_priv *priv)
856 {
857 void *v = NULL;
858 int p;
859
860 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
861 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
862 if (v)
863 break;
864 }
865 state->arp_table = p;
866 return v;
867 }
868
869 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
870 struct lec_priv *priv)
871 {
872 struct hlist_head *lec_misc_tables[] = {
873 &priv->lec_arp_empty_ones,
874 &priv->lec_no_forward,
875 &priv->mcast_fwds
876 };
877 void *v = NULL;
878 int q;
879
880 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
881 v = lec_tbl_walk(state, lec_misc_tables[q], l);
882 if (v)
883 break;
884 }
885 state->misc_table = q;
886 return v;
887 }
888
889 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
890 struct lec_priv *priv)
891 {
892 if (!state->locked) {
893 state->locked = priv;
894 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
895 }
896 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
897 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
898 state->locked = NULL;
899 /* Partial state reset for the next time we get called */
900 state->arp_table = state->misc_table = 0;
901 }
902 return state->locked;
903 }
904
905 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
906 {
907 struct net_device *dev;
908 void *v;
909
910 dev = state->dev ? state->dev : dev_lec[state->itf];
911 v = (dev && netdev_priv(dev)) ?
912 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
913 if (!v && dev) {
914 dev_put(dev);
915 /* Partial state reset for the next time we get called */
916 dev = NULL;
917 }
918 state->dev = dev;
919 return v;
920 }
921
922 static void *lec_get_idx(struct lec_state *state, loff_t l)
923 {
924 void *v = NULL;
925
926 for (; state->itf < MAX_LEC_ITF; state->itf++) {
927 v = lec_itf_walk(state, &l);
928 if (v)
929 break;
930 }
931 return v;
932 }
933
934 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
935 {
936 struct lec_state *state = seq->private;
937
938 state->itf = 0;
939 state->dev = NULL;
940 state->locked = NULL;
941 state->arp_table = 0;
942 state->misc_table = 0;
943 state->node = SEQ_START_TOKEN;
944
945 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
946 }
947
948 static void lec_seq_stop(struct seq_file *seq, void *v)
949 {
950 struct lec_state *state = seq->private;
951
952 if (state->dev) {
953 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
954 state->flags);
955 dev_put(state->dev);
956 }
957 }
958
959 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
960 {
961 struct lec_state *state = seq->private;
962
963 v = lec_get_idx(state, 1);
964 *pos += !!PTR_ERR(v);
965 return v;
966 }
967
968 static int lec_seq_show(struct seq_file *seq, void *v)
969 {
970 static const char lec_banner[] =
971 "Itf MAC ATM destination"
972 " Status Flags "
973 "VPI/VCI Recv VPI/VCI\n";
974
975 if (v == SEQ_START_TOKEN)
976 seq_puts(seq, lec_banner);
977 else {
978 struct lec_state *state = seq->private;
979 struct net_device *dev = state->dev;
980 struct lec_arp_table *entry = hlist_entry(state->node,
981 struct lec_arp_table,
982 next);
983
984 seq_printf(seq, "%s ", dev->name);
985 lec_info(seq, entry);
986 }
987 return 0;
988 }
989
990 static const struct seq_operations lec_seq_ops = {
991 .start = lec_seq_start,
992 .next = lec_seq_next,
993 .stop = lec_seq_stop,
994 .show = lec_seq_show,
995 };
996 #endif
997
998 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
999 {
1000 struct atm_vcc *vcc = ATM_SD(sock);
1001 int err = 0;
1002
1003 switch (cmd) {
1004 case ATMLEC_CTRL:
1005 case ATMLEC_MCAST:
1006 case ATMLEC_DATA:
1007 if (!capable(CAP_NET_ADMIN))
1008 return -EPERM;
1009 break;
1010 default:
1011 return -ENOIOCTLCMD;
1012 }
1013
1014 switch (cmd) {
1015 case ATMLEC_CTRL:
1016 err = lecd_attach(vcc, (int)arg);
1017 if (err >= 0)
1018 sock->state = SS_CONNECTED;
1019 break;
1020 case ATMLEC_MCAST:
1021 err = lec_mcast_attach(vcc, (int)arg);
1022 break;
1023 case ATMLEC_DATA:
1024 err = lec_vcc_attach(vcc, (void __user *)arg);
1025 break;
1026 }
1027
1028 return err;
1029 }
1030
1031 static struct atm_ioctl lane_ioctl_ops = {
1032 .owner = THIS_MODULE,
1033 .ioctl = lane_ioctl,
1034 };
1035
1036 static int __init lane_module_init(void)
1037 {
1038 #ifdef CONFIG_PROC_FS
1039 struct proc_dir_entry *p;
1040
1041 p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops,
1042 sizeof(struct lec_state), NULL);
1043 if (!p) {
1044 pr_err("Unable to initialize /proc/net/atm/lec\n");
1045 return -ENOMEM;
1046 }
1047 #endif
1048
1049 register_atm_ioctl(&lane_ioctl_ops);
1050 pr_info("lec.c: initialized\n");
1051 return 0;
1052 }
1053
1054 static void __exit lane_module_cleanup(void)
1055 {
1056 int i;
1057
1058 #ifdef CONFIG_PROC_FS
1059 remove_proc_entry("lec", atm_proc_root);
1060 #endif
1061
1062 deregister_atm_ioctl(&lane_ioctl_ops);
1063
1064 for (i = 0; i < MAX_LEC_ITF; i++) {
1065 if (dev_lec[i] != NULL) {
1066 unregister_netdev(dev_lec[i]);
1067 free_netdev(dev_lec[i]);
1068 dev_lec[i] = NULL;
1069 }
1070 }
1071 }
1072
1073 module_init(lane_module_init);
1074 module_exit(lane_module_cleanup);
1075
1076 /*
1077 * LANE2: 3.1.3, LE_RESOLVE.request
1078 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1079 * If sizeoftlvs == NULL the default TLVs associated with with this
1080 * lec will be used.
1081 * If dst_mac == NULL, targetless LE_ARP will be sent
1082 */
1083 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1084 u8 **tlvs, u32 *sizeoftlvs)
1085 {
1086 unsigned long flags;
1087 struct lec_priv *priv = netdev_priv(dev);
1088 struct lec_arp_table *table;
1089 struct sk_buff *skb;
1090 int retval;
1091
1092 if (force == 0) {
1093 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1094 table = lec_arp_find(priv, dst_mac);
1095 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1096 if (table == NULL)
1097 return -1;
1098
1099 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1100 if (*tlvs == NULL)
1101 return -1;
1102
1103 *sizeoftlvs = table->sizeoftlvs;
1104
1105 return 0;
1106 }
1107
1108 if (sizeoftlvs == NULL)
1109 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1110
1111 else {
1112 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1113 if (skb == NULL)
1114 return -1;
1115 skb->len = *sizeoftlvs;
1116 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1117 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1118 }
1119 return retval;
1120 }
1121
1122 /*
1123 * LANE2: 3.1.4, LE_ASSOCIATE.request
1124 * Associate the *tlvs with the *lan_dst address.
1125 * Will overwrite any previous association
1126 * Returns 1 for success, 0 for failure (out of memory)
1127 *
1128 */
1129 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1130 const u8 *tlvs, u32 sizeoftlvs)
1131 {
1132 int retval;
1133 struct sk_buff *skb;
1134 struct lec_priv *priv = netdev_priv(dev);
1135
1136 if (!ether_addr_equal(lan_dst, dev->dev_addr))
1137 return 0; /* not our mac address */
1138
1139 kfree(priv->tlvs); /* NULL if there was no previous association */
1140
1141 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1142 if (priv->tlvs == NULL)
1143 return 0;
1144 priv->sizeoftlvs = sizeoftlvs;
1145
1146 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1147 if (skb == NULL)
1148 return 0;
1149 skb->len = sizeoftlvs;
1150 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1151 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1152 if (retval != 0)
1153 pr_info("lec.c: lane2_associate_req() failed\n");
1154 /*
1155 * If the previous association has changed we must
1156 * somehow notify other LANE entities about the change
1157 */
1158 return 1;
1159 }
1160
1161 /*
1162 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1163 *
1164 */
1165 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1166 const u8 *tlvs, u32 sizeoftlvs)
1167 {
1168 #if 0
1169 int i = 0;
1170 #endif
1171 struct lec_priv *priv = netdev_priv(dev);
1172 #if 0 /*
1173 * Why have the TLVs in LE_ARP entries
1174 * since we do not use them? When you
1175 * uncomment this code, make sure the
1176 * TLVs get freed when entry is killed
1177 */
1178 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1179
1180 if (entry == NULL)
1181 return; /* should not happen */
1182
1183 kfree(entry->tlvs);
1184
1185 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1186 if (entry->tlvs == NULL)
1187 return;
1188 entry->sizeoftlvs = sizeoftlvs;
1189 #endif
1190 #if 0
1191 pr_info("\n");
1192 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1193 while (i < sizeoftlvs)
1194 pr_cont("%02x ", tlvs[i++]);
1195
1196 pr_cont("\n");
1197 #endif
1198
1199 /* tell MPOA about the TLVs we saw */
1200 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1201 priv->lane2_ops->associate_indicator(dev, mac_addr,
1202 tlvs, sizeoftlvs);
1203 }
1204 }
1205
1206 /*
1207 * Here starts what used to lec_arpc.c
1208 *
1209 * lec_arpc.c was added here when making
1210 * lane client modular. October 1997
1211 */
1212
1213 #include <linux/types.h>
1214 #include <linux/timer.h>
1215 #include <linux/param.h>
1216 #include <linux/atomic.h>
1217 #include <linux/inetdevice.h>
1218 #include <net/route.h>
1219
1220 #if 0
1221 #define pr_debug(format, args...)
1222 /*
1223 #define pr_debug printk
1224 */
1225 #endif
1226 #define DEBUG_ARP_TABLE 0
1227
1228 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1229
1230 static void lec_arp_check_expire(struct work_struct *work);
1231 static void lec_arp_expire_arp(struct timer_list *t);
1232
1233 /*
1234 * Arp table funcs
1235 */
1236
1237 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1238
1239 /*
1240 * Initialization of arp-cache
1241 */
1242 static void lec_arp_init(struct lec_priv *priv)
1243 {
1244 unsigned short i;
1245
1246 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1247 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1248 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1249 INIT_HLIST_HEAD(&priv->lec_no_forward);
1250 INIT_HLIST_HEAD(&priv->mcast_fwds);
1251 spin_lock_init(&priv->lec_arp_lock);
1252 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1253 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1254 }
1255
1256 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1257 {
1258 if (entry->vcc) {
1259 struct atm_vcc *vcc = entry->vcc;
1260 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1261 struct net_device *dev = (struct net_device *)vcc->proto_data;
1262
1263 vcc->pop = vpriv->old_pop;
1264 if (vpriv->xoff)
1265 netif_wake_queue(dev);
1266 kfree(vpriv);
1267 vcc->user_back = NULL;
1268 vcc->push = entry->old_push;
1269 vcc_release_async(vcc, -EPIPE);
1270 entry->vcc = NULL;
1271 }
1272 if (entry->recv_vcc) {
1273 entry->recv_vcc->push = entry->old_recv_push;
1274 vcc_release_async(entry->recv_vcc, -EPIPE);
1275 entry->recv_vcc = NULL;
1276 }
1277 }
1278
1279 /*
1280 * Insert entry to lec_arp_table
1281 * LANE2: Add to the end of the list to satisfy 8.1.13
1282 */
1283 static inline void
1284 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1285 {
1286 struct hlist_head *tmp;
1287
1288 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1289 hlist_add_head(&entry->next, tmp);
1290
1291 pr_debug("Added entry:%pM\n", entry->mac_addr);
1292 }
1293
1294 /*
1295 * Remove entry from lec_arp_table
1296 */
1297 static int
1298 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1299 {
1300 struct lec_arp_table *entry;
1301 int i, remove_vcc = 1;
1302
1303 if (!to_remove)
1304 return -1;
1305
1306 hlist_del(&to_remove->next);
1307 del_timer(&to_remove->timer);
1308
1309 /*
1310 * If this is the only MAC connected to this VCC,
1311 * also tear down the VCC
1312 */
1313 if (to_remove->status >= ESI_FLUSH_PENDING) {
1314 /*
1315 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1316 */
1317 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1318 hlist_for_each_entry(entry,
1319 &priv->lec_arp_tables[i], next) {
1320 if (memcmp(to_remove->atm_addr,
1321 entry->atm_addr, ATM_ESA_LEN) == 0) {
1322 remove_vcc = 0;
1323 break;
1324 }
1325 }
1326 }
1327 if (remove_vcc)
1328 lec_arp_clear_vccs(to_remove);
1329 }
1330 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */
1331
1332 pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1333 return 0;
1334 }
1335
1336 #if DEBUG_ARP_TABLE
1337 static const char *get_status_string(unsigned char st)
1338 {
1339 switch (st) {
1340 case ESI_UNKNOWN:
1341 return "ESI_UNKNOWN";
1342 case ESI_ARP_PENDING:
1343 return "ESI_ARP_PENDING";
1344 case ESI_VC_PENDING:
1345 return "ESI_VC_PENDING";
1346 case ESI_FLUSH_PENDING:
1347 return "ESI_FLUSH_PENDING";
1348 case ESI_FORWARD_DIRECT:
1349 return "ESI_FORWARD_DIRECT";
1350 }
1351 return "<UNKNOWN>";
1352 }
1353
1354 static void dump_arp_table(struct lec_priv *priv)
1355 {
1356 struct lec_arp_table *rulla;
1357 char buf[256];
1358 int i, j, offset;
1359
1360 pr_info("Dump %p:\n", priv);
1361 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1362 hlist_for_each_entry(rulla,
1363 &priv->lec_arp_tables[i], next) {
1364 offset = 0;
1365 offset += sprintf(buf, "%d: %p\n", i, rulla);
1366 offset += sprintf(buf + offset, "Mac: %pM",
1367 rulla->mac_addr);
1368 offset += sprintf(buf + offset, " Atm:");
1369 for (j = 0; j < ATM_ESA_LEN; j++) {
1370 offset += sprintf(buf + offset,
1371 "%2.2x ",
1372 rulla->atm_addr[j] & 0xff);
1373 }
1374 offset += sprintf(buf + offset,
1375 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1376 rulla->vcc ? rulla->vcc->vpi : 0,
1377 rulla->vcc ? rulla->vcc->vci : 0,
1378 rulla->recv_vcc ? rulla->recv_vcc->
1379 vpi : 0,
1380 rulla->recv_vcc ? rulla->recv_vcc->
1381 vci : 0, rulla->last_used,
1382 rulla->timestamp, rulla->no_tries);
1383 offset +=
1384 sprintf(buf + offset,
1385 "Flags:%x, Packets_flooded:%x, Status: %s ",
1386 rulla->flags, rulla->packets_flooded,
1387 get_status_string(rulla->status));
1388 pr_info("%s\n", buf);
1389 }
1390 }
1391
1392 if (!hlist_empty(&priv->lec_no_forward))
1393 pr_info("No forward\n");
1394 hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1395 offset = 0;
1396 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1397 offset += sprintf(buf + offset, " Atm:");
1398 for (j = 0; j < ATM_ESA_LEN; j++) {
1399 offset += sprintf(buf + offset, "%2.2x ",
1400 rulla->atm_addr[j] & 0xff);
1401 }
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->vpi : 0,
1407 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1408 rulla->last_used,
1409 rulla->timestamp, rulla->no_tries);
1410 offset += sprintf(buf + offset,
1411 "Flags:%x, Packets_flooded:%x, Status: %s ",
1412 rulla->flags, rulla->packets_flooded,
1413 get_status_string(rulla->status));
1414 pr_info("%s\n", buf);
1415 }
1416
1417 if (!hlist_empty(&priv->lec_arp_empty_ones))
1418 pr_info("Empty ones\n");
1419 hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1420 offset = 0;
1421 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1422 offset += sprintf(buf + offset, " Atm:");
1423 for (j = 0; j < ATM_ESA_LEN; j++) {
1424 offset += sprintf(buf + offset, "%2.2x ",
1425 rulla->atm_addr[j] & 0xff);
1426 }
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", buf);
1440 }
1441
1442 if (!hlist_empty(&priv->mcast_fwds))
1443 pr_info("Multicast Forward VCCs\n");
1444 hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1445 offset = 0;
1446 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1447 offset += sprintf(buf + offset, " Atm:");
1448 for (j = 0; j < ATM_ESA_LEN; j++) {
1449 offset += sprintf(buf + offset, "%2.2x ",
1450 rulla->atm_addr[j] & 0xff);
1451 }
1452 offset += sprintf(buf + offset,
1453 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1454 rulla->vcc ? rulla->vcc->vpi : 0,
1455 rulla->vcc ? rulla->vcc->vci : 0,
1456 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1457 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1458 rulla->last_used,
1459 rulla->timestamp, rulla->no_tries);
1460 offset += sprintf(buf + offset,
1461 "Flags:%x, Packets_flooded:%x, Status: %s ",
1462 rulla->flags, rulla->packets_flooded,
1463 get_status_string(rulla->status));
1464 pr_info("%s\n", buf);
1465 }
1466
1467 }
1468 #else
1469 #define dump_arp_table(priv) do { } while (0)
1470 #endif
1471
1472 /*
1473 * Destruction of arp-cache
1474 */
1475 static void lec_arp_destroy(struct lec_priv *priv)
1476 {
1477 unsigned long flags;
1478 struct hlist_node *next;
1479 struct lec_arp_table *entry;
1480 int i;
1481
1482 cancel_delayed_work_sync(&priv->lec_arp_work);
1483
1484 /*
1485 * Remove all entries
1486 */
1487
1488 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1489 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1490 hlist_for_each_entry_safe(entry, next,
1491 &priv->lec_arp_tables[i], next) {
1492 lec_arp_remove(priv, entry);
1493 lec_arp_put(entry);
1494 }
1495 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1496 }
1497
1498 hlist_for_each_entry_safe(entry, next,
1499 &priv->lec_arp_empty_ones, next) {
1500 del_timer_sync(&entry->timer);
1501 lec_arp_clear_vccs(entry);
1502 hlist_del(&entry->next);
1503 lec_arp_put(entry);
1504 }
1505 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1506
1507 hlist_for_each_entry_safe(entry, next,
1508 &priv->lec_no_forward, next) {
1509 del_timer_sync(&entry->timer);
1510 lec_arp_clear_vccs(entry);
1511 hlist_del(&entry->next);
1512 lec_arp_put(entry);
1513 }
1514 INIT_HLIST_HEAD(&priv->lec_no_forward);
1515
1516 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1517 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1518 lec_arp_clear_vccs(entry);
1519 hlist_del(&entry->next);
1520 lec_arp_put(entry);
1521 }
1522 INIT_HLIST_HEAD(&priv->mcast_fwds);
1523 priv->mcast_vcc = NULL;
1524 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1525 }
1526
1527 /*
1528 * Find entry by mac_address
1529 */
1530 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1531 const unsigned char *mac_addr)
1532 {
1533 struct hlist_head *head;
1534 struct lec_arp_table *entry;
1535
1536 pr_debug("%pM\n", mac_addr);
1537
1538 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1539 hlist_for_each_entry(entry, head, next) {
1540 if (ether_addr_equal(mac_addr, entry->mac_addr))
1541 return entry;
1542 }
1543 return NULL;
1544 }
1545
1546 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1547 const unsigned char *mac_addr)
1548 {
1549 struct lec_arp_table *to_return;
1550
1551 to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1552 if (!to_return) {
1553 pr_info("LEC: Arp entry kmalloc failed\n");
1554 return NULL;
1555 }
1556 ether_addr_copy(to_return->mac_addr, mac_addr);
1557 INIT_HLIST_NODE(&to_return->next);
1558 timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
1559 to_return->last_used = jiffies;
1560 to_return->priv = priv;
1561 skb_queue_head_init(&to_return->tx_wait);
1562 refcount_set(&to_return->usage, 1);
1563 return to_return;
1564 }
1565
1566 /* Arp sent timer expired */
1567 static void lec_arp_expire_arp(struct timer_list *t)
1568 {
1569 struct lec_arp_table *entry;
1570
1571 entry = from_timer(entry, t, timer);
1572
1573 pr_debug("\n");
1574 if (entry->status == ESI_ARP_PENDING) {
1575 if (entry->no_tries <= entry->priv->max_retry_count) {
1576 if (entry->is_rdesc)
1577 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1578 entry->mac_addr, NULL, NULL);
1579 else
1580 send_to_lecd(entry->priv, l_arp_xmt,
1581 entry->mac_addr, NULL, NULL);
1582 entry->no_tries++;
1583 }
1584 mod_timer(&entry->timer, jiffies + (1 * HZ));
1585 }
1586 }
1587
1588 /* Unknown/unused vcc expire, remove associated entry */
1589 static void lec_arp_expire_vcc(struct timer_list *t)
1590 {
1591 unsigned long flags;
1592 struct lec_arp_table *to_remove = from_timer(to_remove, t, timer);
1593 struct lec_priv *priv = to_remove->priv;
1594
1595 del_timer(&to_remove->timer);
1596
1597 pr_debug("%p %p: vpi:%d vci:%d\n",
1598 to_remove, priv,
1599 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1600 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1601
1602 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1603 hlist_del(&to_remove->next);
1604 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1605
1606 lec_arp_clear_vccs(to_remove);
1607 lec_arp_put(to_remove);
1608 }
1609
1610 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1611 unsigned long now,
1612 struct lec_priv *priv)
1613 {
1614 unsigned long time_to_check;
1615
1616 if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1617 time_to_check = priv->forward_delay_time;
1618 else
1619 time_to_check = priv->aging_time;
1620
1621 pr_debug("About to expire: %lx - %lx > %lx\n",
1622 now, entry->last_used, time_to_check);
1623 if (time_after(now, entry->last_used + time_to_check) &&
1624 !(entry->flags & LEC_PERMANENT_FLAG) &&
1625 !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */
1626 /* Remove entry */
1627 pr_debug("Entry timed out\n");
1628 lec_arp_remove(priv, entry);
1629 lec_arp_put(entry);
1630 } else {
1631 /* Something else */
1632 if ((entry->status == ESI_VC_PENDING ||
1633 entry->status == ESI_ARP_PENDING) &&
1634 time_after_eq(now, entry->timestamp +
1635 priv->max_unknown_frame_time)) {
1636 entry->timestamp = jiffies;
1637 entry->packets_flooded = 0;
1638 if (entry->status == ESI_VC_PENDING)
1639 send_to_lecd(priv, l_svc_setup,
1640 entry->mac_addr,
1641 entry->atm_addr,
1642 NULL);
1643 }
1644 if (entry->status == ESI_FLUSH_PENDING &&
1645 time_after_eq(now, entry->timestamp +
1646 priv->path_switching_delay)) {
1647 lec_arp_hold(entry);
1648 return true;
1649 }
1650 }
1651
1652 return false;
1653 }
1654 /*
1655 * Expire entries.
1656 * 1. Re-set timer
1657 * 2. For each entry, delete entries that have aged past the age limit.
1658 * 3. For each entry, depending on the status of the entry, perform
1659 * the following maintenance.
1660 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1661 * tick_count is above the max_unknown_frame_time, clear
1662 * the tick_count to zero and clear the packets_flooded counter
1663 * to zero. This supports the packet rate limit per address
1664 * while flooding unknowns.
1665 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1666 * than or equal to the path_switching_delay, change the status
1667 * to ESI_FORWARD_DIRECT. This causes the flush period to end
1668 * regardless of the progress of the flush protocol.
1669 */
1670 static void lec_arp_check_expire(struct work_struct *work)
1671 {
1672 unsigned long flags;
1673 struct lec_priv *priv =
1674 container_of(work, struct lec_priv, lec_arp_work.work);
1675 struct hlist_node *next;
1676 struct lec_arp_table *entry;
1677 unsigned long now;
1678 int i;
1679
1680 pr_debug("%p\n", priv);
1681 now = jiffies;
1682 restart:
1683 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1684 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1685 hlist_for_each_entry_safe(entry, next,
1686 &priv->lec_arp_tables[i], next) {
1687 if (__lec_arp_check_expire(entry, now, priv)) {
1688 struct sk_buff *skb;
1689 struct atm_vcc *vcc = entry->vcc;
1690
1691 spin_unlock_irqrestore(&priv->lec_arp_lock,
1692 flags);
1693 while ((skb = skb_dequeue(&entry->tx_wait)))
1694 lec_send(vcc, skb);
1695 entry->last_used = jiffies;
1696 entry->status = ESI_FORWARD_DIRECT;
1697 lec_arp_put(entry);
1698
1699 goto restart;
1700 }
1701 }
1702 }
1703 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1704
1705 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1706 }
1707
1708 /*
1709 * Try to find vcc where mac_address is attached.
1710 *
1711 */
1712 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1713 const unsigned char *mac_to_find,
1714 int is_rdesc,
1715 struct lec_arp_table **ret_entry)
1716 {
1717 unsigned long flags;
1718 struct lec_arp_table *entry;
1719 struct atm_vcc *found;
1720
1721 if (mac_to_find[0] & 0x01) {
1722 switch (priv->lane_version) {
1723 case 1:
1724 return priv->mcast_vcc;
1725 case 2: /* LANE2 wants arp for multicast addresses */
1726 if (ether_addr_equal(mac_to_find, bus_mac))
1727 return priv->mcast_vcc;
1728 break;
1729 default:
1730 break;
1731 }
1732 }
1733
1734 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1735 entry = lec_arp_find(priv, mac_to_find);
1736
1737 if (entry) {
1738 if (entry->status == ESI_FORWARD_DIRECT) {
1739 /* Connection Ok */
1740 entry->last_used = jiffies;
1741 lec_arp_hold(entry);
1742 *ret_entry = entry;
1743 found = entry->vcc;
1744 goto out;
1745 }
1746 /*
1747 * If the LE_ARP cache entry is still pending, reset count to 0
1748 * so another LE_ARP request can be made for this frame.
1749 */
1750 if (entry->status == ESI_ARP_PENDING)
1751 entry->no_tries = 0;
1752 /*
1753 * Data direct VC not yet set up, check to see if the unknown
1754 * frame count is greater than the limit. If the limit has
1755 * not been reached, allow the caller to send packet to
1756 * BUS.
1757 */
1758 if (entry->status != ESI_FLUSH_PENDING &&
1759 entry->packets_flooded <
1760 priv->maximum_unknown_frame_count) {
1761 entry->packets_flooded++;
1762 pr_debug("Flooding..\n");
1763 found = priv->mcast_vcc;
1764 goto out;
1765 }
1766 /*
1767 * We got here because entry->status == ESI_FLUSH_PENDING
1768 * or BUS flood limit was reached for an entry which is
1769 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1770 */
1771 lec_arp_hold(entry);
1772 *ret_entry = entry;
1773 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1774 entry->vcc);
1775 found = NULL;
1776 } else {
1777 /* No matching entry was found */
1778 entry = make_entry(priv, mac_to_find);
1779 pr_debug("Making entry\n");
1780 if (!entry) {
1781 found = priv->mcast_vcc;
1782 goto out;
1783 }
1784 lec_arp_add(priv, entry);
1785 /* We want arp-request(s) to be sent */
1786 entry->packets_flooded = 1;
1787 entry->status = ESI_ARP_PENDING;
1788 entry->no_tries = 1;
1789 entry->last_used = entry->timestamp = jiffies;
1790 entry->is_rdesc = is_rdesc;
1791 if (entry->is_rdesc)
1792 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1793 NULL);
1794 else
1795 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1796 entry->timer.expires = jiffies + (1 * HZ);
1797 entry->timer.function = lec_arp_expire_arp;
1798 add_timer(&entry->timer);
1799 found = priv->mcast_vcc;
1800 }
1801
1802 out:
1803 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1804 return found;
1805 }
1806
1807 static int
1808 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1809 unsigned long permanent)
1810 {
1811 unsigned long flags;
1812 struct hlist_node *next;
1813 struct lec_arp_table *entry;
1814 int i;
1815
1816 pr_debug("\n");
1817 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1818 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1819 hlist_for_each_entry_safe(entry, next,
1820 &priv->lec_arp_tables[i], next) {
1821 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1822 (permanent ||
1823 !(entry->flags & LEC_PERMANENT_FLAG))) {
1824 lec_arp_remove(priv, entry);
1825 lec_arp_put(entry);
1826 }
1827 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1828 return 0;
1829 }
1830 }
1831 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1832 return -1;
1833 }
1834
1835 /*
1836 * Notifies: Response to arp_request (atm_addr != NULL)
1837 */
1838 static void
1839 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1840 const unsigned char *atm_addr, unsigned long remoteflag,
1841 unsigned int targetless_le_arp)
1842 {
1843 unsigned long flags;
1844 struct hlist_node *next;
1845 struct lec_arp_table *entry, *tmp;
1846 int i;
1847
1848 pr_debug("%smac:%pM\n",
1849 (targetless_le_arp) ? "targetless " : "", mac_addr);
1850
1851 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1852 entry = lec_arp_find(priv, mac_addr);
1853 if (entry == NULL && targetless_le_arp)
1854 goto out; /*
1855 * LANE2: ignore targetless LE_ARPs for which
1856 * we have no entry in the cache. 7.1.30
1857 */
1858 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1859 hlist_for_each_entry_safe(entry, next,
1860 &priv->lec_arp_empty_ones, next) {
1861 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1862 hlist_del(&entry->next);
1863 del_timer(&entry->timer);
1864 tmp = lec_arp_find(priv, mac_addr);
1865 if (tmp) {
1866 del_timer(&tmp->timer);
1867 tmp->status = ESI_FORWARD_DIRECT;
1868 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1869 tmp->vcc = entry->vcc;
1870 tmp->old_push = entry->old_push;
1871 tmp->last_used = jiffies;
1872 del_timer(&entry->timer);
1873 lec_arp_put(entry);
1874 entry = tmp;
1875 } else {
1876 entry->status = ESI_FORWARD_DIRECT;
1877 ether_addr_copy(entry->mac_addr,
1878 mac_addr);
1879 entry->last_used = jiffies;
1880 lec_arp_add(priv, entry);
1881 }
1882 if (remoteflag)
1883 entry->flags |= LEC_REMOTE_FLAG;
1884 else
1885 entry->flags &= ~LEC_REMOTE_FLAG;
1886 pr_debug("After update\n");
1887 dump_arp_table(priv);
1888 goto out;
1889 }
1890 }
1891 }
1892
1893 entry = lec_arp_find(priv, mac_addr);
1894 if (!entry) {
1895 entry = make_entry(priv, mac_addr);
1896 if (!entry)
1897 goto out;
1898 entry->status = ESI_UNKNOWN;
1899 lec_arp_add(priv, entry);
1900 /* Temporary, changes before end of function */
1901 }
1902 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1903 del_timer(&entry->timer);
1904 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1905 hlist_for_each_entry(tmp,
1906 &priv->lec_arp_tables[i], next) {
1907 if (entry != tmp &&
1908 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1909 /* Vcc to this host exists */
1910 if (tmp->status > ESI_VC_PENDING) {
1911 /*
1912 * ESI_FLUSH_PENDING,
1913 * ESI_FORWARD_DIRECT
1914 */
1915 entry->vcc = tmp->vcc;
1916 entry->old_push = tmp->old_push;
1917 }
1918 entry->status = tmp->status;
1919 break;
1920 }
1921 }
1922 }
1923 if (remoteflag)
1924 entry->flags |= LEC_REMOTE_FLAG;
1925 else
1926 entry->flags &= ~LEC_REMOTE_FLAG;
1927 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1928 entry->status = ESI_VC_PENDING;
1929 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1930 }
1931 pr_debug("After update2\n");
1932 dump_arp_table(priv);
1933 out:
1934 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1935 }
1936
1937 /*
1938 * Notifies: Vcc setup ready
1939 */
1940 static void
1941 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1942 struct atm_vcc *vcc,
1943 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1944 {
1945 unsigned long flags;
1946 struct lec_arp_table *entry;
1947 int i, found_entry = 0;
1948
1949 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1950 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1951 if (ioc_data->receive == 2) {
1952 pr_debug("LEC_ARP: Attaching mcast forward\n");
1953 #if 0
1954 entry = lec_arp_find(priv, bus_mac);
1955 if (!entry) {
1956 pr_info("LEC_ARP: Multicast entry not found!\n");
1957 goto out;
1958 }
1959 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1960 entry->recv_vcc = vcc;
1961 entry->old_recv_push = old_push;
1962 #endif
1963 entry = make_entry(priv, bus_mac);
1964 if (entry == NULL)
1965 goto out;
1966 del_timer(&entry->timer);
1967 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1968 entry->recv_vcc = vcc;
1969 entry->old_recv_push = old_push;
1970 hlist_add_head(&entry->next, &priv->mcast_fwds);
1971 goto out;
1972 } else if (ioc_data->receive == 1) {
1973 /*
1974 * Vcc which we don't want to make default vcc,
1975 * attach it anyway.
1976 */
1977 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",
1978 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1979 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1980 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
1981 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
1982 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
1983 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
1984 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
1985 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
1986 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
1987 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
1988 entry = make_entry(priv, bus_mac);
1989 if (entry == NULL)
1990 goto out;
1991 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1992 eth_zero_addr(entry->mac_addr);
1993 entry->recv_vcc = vcc;
1994 entry->old_recv_push = old_push;
1995 entry->status = ESI_UNKNOWN;
1996 entry->timer.expires = jiffies + priv->vcc_timeout_period;
1997 entry->timer.function = lec_arp_expire_vcc;
1998 hlist_add_head(&entry->next, &priv->lec_no_forward);
1999 add_timer(&entry->timer);
2000 dump_arp_table(priv);
2001 goto out;
2002 }
2003 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",
2004 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2005 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2006 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2007 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2008 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2009 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2010 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2011 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2012 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2013 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
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 del_timer(&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
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
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
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(sizeof(struct lec_vcc_priv), GFP_KERNEL);
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
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 del_timer(&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 del_timer(&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
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 del_timer(&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_LICENSE("GPL");
Linux with added FPC-III support