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Merge tag 'kvm-ppc-fixes-4.15-3' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-bionic-kernel.git] / net / atm / lec.c
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 #include "lec.h"
45 #include "lec_arpc.h"
46 #include "resources.h"
47
48 #define DUMP_PACKETS 0 /*
49 * 0 = None,
50 * 1 = 30 first bytes
51 * 2 = Whole packet
52 */
53
54 #define LEC_UNRES_QUE_LEN 8 /*
55 * number of tx packets to queue for a
56 * single destination while waiting for SVC
57 */
58
59 static int lec_open(struct net_device *dev);
60 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
61 struct net_device *dev);
62 static int lec_close(struct net_device *dev);
63 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
64 const unsigned char *mac_addr);
65 static int lec_arp_remove(struct lec_priv *priv,
66 struct lec_arp_table *to_remove);
67 /* LANE2 functions */
68 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
69 const u8 *tlvs, u32 sizeoftlvs);
70 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
71 u8 **tlvs, u32 *sizeoftlvs);
72 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
73 const u8 *tlvs, u32 sizeoftlvs);
74
75 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
76 unsigned long permanent);
77 static void lec_arp_check_empties(struct lec_priv *priv,
78 struct atm_vcc *vcc, struct sk_buff *skb);
79 static void lec_arp_destroy(struct lec_priv *priv);
80 static void lec_arp_init(struct lec_priv *priv);
81 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
82 const unsigned char *mac_to_find,
83 int is_rdesc,
84 struct lec_arp_table **ret_entry);
85 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
86 const unsigned char *atm_addr,
87 unsigned long remoteflag,
88 unsigned int targetless_le_arp);
89 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
90 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
91 static void lec_set_flush_tran_id(struct lec_priv *priv,
92 const unsigned char *atm_addr,
93 unsigned long tran_id);
94 static void lec_vcc_added(struct lec_priv *priv,
95 const struct atmlec_ioc *ioc_data,
96 struct atm_vcc *vcc,
97 void (*old_push)(struct atm_vcc *vcc,
98 struct sk_buff *skb));
99 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
100
101 /* must be done under lec_arp_lock */
102 static inline void lec_arp_hold(struct lec_arp_table *entry)
103 {
104 refcount_inc(&entry->usage);
105 }
106
107 static inline void lec_arp_put(struct lec_arp_table *entry)
108 {
109 if (refcount_dec_and_test(&entry->usage))
110 kfree(entry);
111 }
112
113 static struct lane2_ops lane2_ops = {
114 .resolve = lane2_resolve, /* spec 3.1.3 */
115 .associate_req = lane2_associate_req, /* spec 3.1.4 */
116 .associate_indicator = NULL /* spec 3.1.5 */
117 };
118
119 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
120
121 /* Device structures */
122 static struct net_device *dev_lec[MAX_LEC_ITF];
123
124 #if IS_ENABLED(CONFIG_BRIDGE)
125 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
126 {
127 char *buff;
128 struct lec_priv *priv;
129
130 /*
131 * Check if this is a BPDU. If so, ask zeppelin to send
132 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
133 * as the Config BPDU has
134 */
135 buff = skb->data + skb->dev->hard_header_len;
136 if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
137 struct sock *sk;
138 struct sk_buff *skb2;
139 struct atmlec_msg *mesg;
140
141 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
142 if (skb2 == NULL)
143 return;
144 skb2->len = sizeof(struct atmlec_msg);
145 mesg = (struct atmlec_msg *)skb2->data;
146 mesg->type = l_topology_change;
147 buff += 4;
148 mesg->content.normal.flag = *buff & 0x01;
149 /* 0x01 is topology change */
150
151 priv = netdev_priv(dev);
152 atm_force_charge(priv->lecd, skb2->truesize);
153 sk = sk_atm(priv->lecd);
154 skb_queue_tail(&sk->sk_receive_queue, skb2);
155 sk->sk_data_ready(sk);
156 }
157 }
158 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
159
160 /*
161 * Open/initialize the netdevice. This is called (in the current kernel)
162 * sometime after booting when the 'ifconfig' program is run.
163 *
164 * This routine should set everything up anew at each open, even
165 * registers that "should" only need to be set once at boot, so that
166 * there is non-reboot way to recover if something goes wrong.
167 */
168
169 static int lec_open(struct net_device *dev)
170 {
171 netif_start_queue(dev);
172
173 return 0;
174 }
175
176 static void
177 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
178 {
179 struct net_device *dev = skb->dev;
180
181 ATM_SKB(skb)->vcc = vcc;
182 ATM_SKB(skb)->atm_options = vcc->atm_options;
183
184 refcount_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
185 if (vcc->send(vcc, skb) < 0) {
186 dev->stats.tx_dropped++;
187 return;
188 }
189
190 dev->stats.tx_packets++;
191 dev->stats.tx_bytes += skb->len;
192 }
193
194 static void lec_tx_timeout(struct net_device *dev)
195 {
196 pr_info("%s\n", dev->name);
197 netif_trans_update(dev);
198 netif_wake_queue(dev);
199 }
200
201 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
202 struct net_device *dev)
203 {
204 struct sk_buff *skb2;
205 struct lec_priv *priv = netdev_priv(dev);
206 struct lecdatahdr_8023 *lec_h;
207 struct atm_vcc *vcc;
208 struct lec_arp_table *entry;
209 unsigned char *dst;
210 int min_frame_size;
211 int is_rdesc;
212
213 pr_debug("called\n");
214 if (!priv->lecd) {
215 pr_info("%s:No lecd attached\n", dev->name);
216 dev->stats.tx_errors++;
217 netif_stop_queue(dev);
218 kfree_skb(skb);
219 return NETDEV_TX_OK;
220 }
221
222 pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
223 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
224 (long)skb_end_pointer(skb));
225 #if IS_ENABLED(CONFIG_BRIDGE)
226 if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
227 lec_handle_bridge(skb, dev);
228 #endif
229
230 /* Make sure we have room for lec_id */
231 if (skb_headroom(skb) < 2) {
232 pr_debug("reallocating skb\n");
233 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
234 if (unlikely(!skb2)) {
235 kfree_skb(skb);
236 return NETDEV_TX_OK;
237 }
238 consume_skb(skb);
239 skb = skb2;
240 }
241 skb_push(skb, 2);
242
243 /* Put le header to place */
244 lec_h = (struct lecdatahdr_8023 *)skb->data;
245 lec_h->le_header = htons(priv->lecid);
246
247 #if DUMP_PACKETS >= 2
248 #define MAX_DUMP_SKB 99
249 #elif DUMP_PACKETS >= 1
250 #define MAX_DUMP_SKB 30
251 #endif
252 #if DUMP_PACKETS >= 1
253 printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
254 dev->name, skb->len, priv->lecid);
255 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
256 skb->data, min(skb->len, MAX_DUMP_SKB), true);
257 #endif /* DUMP_PACKETS >= 1 */
258
259 /* Minimum ethernet-frame size */
260 min_frame_size = LEC_MINIMUM_8023_SIZE;
261 if (skb->len < min_frame_size) {
262 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
263 skb2 = skb_copy_expand(skb, 0,
264 min_frame_size - skb->truesize,
265 GFP_ATOMIC);
266 dev_kfree_skb(skb);
267 if (skb2 == NULL) {
268 dev->stats.tx_dropped++;
269 return NETDEV_TX_OK;
270 }
271 skb = skb2;
272 }
273 skb_put(skb, min_frame_size - skb->len);
274 }
275
276 /* Send to right vcc */
277 is_rdesc = 0;
278 dst = lec_h->h_dest;
279 entry = NULL;
280 vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
281 pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
282 dev->name, vcc, vcc ? vcc->flags : 0, entry);
283 if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
284 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
285 pr_debug("%s:queuing packet, MAC address %pM\n",
286 dev->name, lec_h->h_dest);
287 skb_queue_tail(&entry->tx_wait, skb);
288 } else {
289 pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
290 dev->name, lec_h->h_dest);
291 dev->stats.tx_dropped++;
292 dev_kfree_skb(skb);
293 }
294 goto out;
295 }
296 #if DUMP_PACKETS > 0
297 printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
298 dev->name, vcc->vpi, vcc->vci);
299 #endif /* DUMP_PACKETS > 0 */
300
301 while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
302 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
303 lec_send(vcc, skb2);
304 }
305
306 lec_send(vcc, skb);
307
308 if (!atm_may_send(vcc, 0)) {
309 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
310
311 vpriv->xoff = 1;
312 netif_stop_queue(dev);
313
314 /*
315 * vcc->pop() might have occurred in between, making
316 * the vcc usuable again. Since xmit is serialized,
317 * this is the only situation we have to re-test.
318 */
319
320 if (atm_may_send(vcc, 0))
321 netif_wake_queue(dev);
322 }
323
324 out:
325 if (entry)
326 lec_arp_put(entry);
327 netif_trans_update(dev);
328 return NETDEV_TX_OK;
329 }
330
331 /* The inverse routine to net_open(). */
332 static int lec_close(struct net_device *dev)
333 {
334 netif_stop_queue(dev);
335 return 0;
336 }
337
338 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
339 {
340 unsigned long flags;
341 struct net_device *dev = (struct net_device *)vcc->proto_data;
342 struct lec_priv *priv = netdev_priv(dev);
343 struct atmlec_msg *mesg;
344 struct lec_arp_table *entry;
345 int i;
346 char *tmp; /* FIXME */
347
348 WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
349 mesg = (struct atmlec_msg *)skb->data;
350 tmp = skb->data;
351 tmp += sizeof(struct atmlec_msg);
352 pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
353 switch (mesg->type) {
354 case l_set_mac_addr:
355 for (i = 0; i < 6; i++)
356 dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
357 break;
358 case l_del_mac_addr:
359 for (i = 0; i < 6; i++)
360 dev->dev_addr[i] = 0;
361 break;
362 case l_addr_delete:
363 lec_addr_delete(priv, mesg->content.normal.atm_addr,
364 mesg->content.normal.flag);
365 break;
366 case l_topology_change:
367 priv->topology_change = mesg->content.normal.flag;
368 break;
369 case l_flush_complete:
370 lec_flush_complete(priv, mesg->content.normal.flag);
371 break;
372 case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */
373 spin_lock_irqsave(&priv->lec_arp_lock, flags);
374 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
375 lec_arp_remove(priv, entry);
376 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
377
378 if (mesg->content.normal.no_source_le_narp)
379 break;
380 /* FALL THROUGH */
381 case l_arp_update:
382 lec_arp_update(priv, mesg->content.normal.mac_addr,
383 mesg->content.normal.atm_addr,
384 mesg->content.normal.flag,
385 mesg->content.normal.targetless_le_arp);
386 pr_debug("in l_arp_update\n");
387 if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */
388 pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
389 mesg->sizeoftlvs);
390 lane2_associate_ind(dev, mesg->content.normal.mac_addr,
391 tmp, mesg->sizeoftlvs);
392 }
393 break;
394 case l_config:
395 priv->maximum_unknown_frame_count =
396 mesg->content.config.maximum_unknown_frame_count;
397 priv->max_unknown_frame_time =
398 (mesg->content.config.max_unknown_frame_time * HZ);
399 priv->max_retry_count = mesg->content.config.max_retry_count;
400 priv->aging_time = (mesg->content.config.aging_time * HZ);
401 priv->forward_delay_time =
402 (mesg->content.config.forward_delay_time * HZ);
403 priv->arp_response_time =
404 (mesg->content.config.arp_response_time * HZ);
405 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
406 priv->path_switching_delay =
407 (mesg->content.config.path_switching_delay * HZ);
408 priv->lane_version = mesg->content.config.lane_version;
409 /* LANE2 */
410 priv->lane2_ops = NULL;
411 if (priv->lane_version > 1)
412 priv->lane2_ops = &lane2_ops;
413 rtnl_lock();
414 if (dev_set_mtu(dev, mesg->content.config.mtu))
415 pr_info("%s: change_mtu to %d failed\n",
416 dev->name, mesg->content.config.mtu);
417 rtnl_unlock();
418 priv->is_proxy = mesg->content.config.is_proxy;
419 break;
420 case l_flush_tran_id:
421 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
422 mesg->content.normal.flag);
423 break;
424 case l_set_lecid:
425 priv->lecid =
426 (unsigned short)(0xffff & mesg->content.normal.flag);
427 break;
428 case l_should_bridge:
429 #if IS_ENABLED(CONFIG_BRIDGE)
430 {
431 pr_debug("%s: bridge zeppelin asks about %pM\n",
432 dev->name, mesg->content.proxy.mac_addr);
433
434 if (br_fdb_test_addr_hook == NULL)
435 break;
436
437 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
438 /* hit from bridge table, send LE_ARP_RESPONSE */
439 struct sk_buff *skb2;
440 struct sock *sk;
441
442 pr_debug("%s: entry found, responding to zeppelin\n",
443 dev->name);
444 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
445 if (skb2 == NULL)
446 break;
447 skb2->len = sizeof(struct atmlec_msg);
448 skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
449 atm_force_charge(priv->lecd, skb2->truesize);
450 sk = sk_atm(priv->lecd);
451 skb_queue_tail(&sk->sk_receive_queue, skb2);
452 sk->sk_data_ready(sk);
453 }
454 }
455 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
456 break;
457 default:
458 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
459 dev_kfree_skb(skb);
460 return -EINVAL;
461 }
462 dev_kfree_skb(skb);
463 return 0;
464 }
465
466 static void lec_atm_close(struct atm_vcc *vcc)
467 {
468 struct sk_buff *skb;
469 struct net_device *dev = (struct net_device *)vcc->proto_data;
470 struct lec_priv *priv = netdev_priv(dev);
471
472 priv->lecd = NULL;
473 /* Do something needful? */
474
475 netif_stop_queue(dev);
476 lec_arp_destroy(priv);
477
478 if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
479 pr_info("%s closing with messages pending\n", dev->name);
480 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
481 atm_return(vcc, skb->truesize);
482 dev_kfree_skb(skb);
483 }
484
485 pr_info("%s: Shut down!\n", dev->name);
486 module_put(THIS_MODULE);
487 }
488
489 static const struct atmdev_ops lecdev_ops = {
490 .close = lec_atm_close,
491 .send = lec_atm_send
492 };
493
494 static struct atm_dev lecatm_dev = {
495 .ops = &lecdev_ops,
496 .type = "lec",
497 .number = 999, /* dummy device number */
498 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
499 };
500
501 /*
502 * LANE2: new argument struct sk_buff *data contains
503 * the LE_ARP based TLVs introduced in the LANE2 spec
504 */
505 static int
506 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
507 const unsigned char *mac_addr, const unsigned char *atm_addr,
508 struct sk_buff *data)
509 {
510 struct sock *sk;
511 struct sk_buff *skb;
512 struct atmlec_msg *mesg;
513
514 if (!priv || !priv->lecd)
515 return -1;
516 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
517 if (!skb)
518 return -1;
519 skb->len = sizeof(struct atmlec_msg);
520 mesg = (struct atmlec_msg *)skb->data;
521 memset(mesg, 0, sizeof(struct atmlec_msg));
522 mesg->type = type;
523 if (data != NULL)
524 mesg->sizeoftlvs = data->len;
525 if (mac_addr)
526 ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
527 else
528 mesg->content.normal.targetless_le_arp = 1;
529 if (atm_addr)
530 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
531
532 atm_force_charge(priv->lecd, skb->truesize);
533 sk = sk_atm(priv->lecd);
534 skb_queue_tail(&sk->sk_receive_queue, skb);
535 sk->sk_data_ready(sk);
536
537 if (data != NULL) {
538 pr_debug("about to send %d bytes of data\n", data->len);
539 atm_force_charge(priv->lecd, data->truesize);
540 skb_queue_tail(&sk->sk_receive_queue, data);
541 sk->sk_data_ready(sk);
542 }
543
544 return 0;
545 }
546
547 static void lec_set_multicast_list(struct net_device *dev)
548 {
549 /*
550 * by default, all multicast frames arrive over the bus.
551 * eventually support selective multicast service
552 */
553 }
554
555 static const struct net_device_ops lec_netdev_ops = {
556 .ndo_open = lec_open,
557 .ndo_stop = lec_close,
558 .ndo_start_xmit = lec_start_xmit,
559 .ndo_tx_timeout = lec_tx_timeout,
560 .ndo_set_rx_mode = lec_set_multicast_list,
561 };
562
563 static const unsigned char lec_ctrl_magic[] = {
564 0xff,
565 0x00,
566 0x01,
567 0x01
568 };
569
570 #define LEC_DATA_DIRECT_8023 2
571 #define LEC_DATA_DIRECT_8025 3
572
573 static int lec_is_data_direct(struct atm_vcc *vcc)
574 {
575 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
576 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
577 }
578
579 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
580 {
581 unsigned long flags;
582 struct net_device *dev = (struct net_device *)vcc->proto_data;
583 struct lec_priv *priv = netdev_priv(dev);
584
585 #if DUMP_PACKETS > 0
586 printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
587 dev->name, vcc->vpi, vcc->vci);
588 #endif
589 if (!skb) {
590 pr_debug("%s: null skb\n", dev->name);
591 lec_vcc_close(priv, vcc);
592 return;
593 }
594 #if DUMP_PACKETS >= 2
595 #define MAX_SKB_DUMP 99
596 #elif DUMP_PACKETS >= 1
597 #define MAX_SKB_DUMP 30
598 #endif
599 #if DUMP_PACKETS > 0
600 printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
601 dev->name, skb->len, priv->lecid);
602 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
603 skb->data, min(MAX_SKB_DUMP, skb->len), true);
604 #endif /* DUMP_PACKETS > 0 */
605 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
606 /* Control frame, to daemon */
607 struct sock *sk = sk_atm(vcc);
608
609 pr_debug("%s: To daemon\n", dev->name);
610 skb_queue_tail(&sk->sk_receive_queue, skb);
611 sk->sk_data_ready(sk);
612 } else { /* Data frame, queue to protocol handlers */
613 struct lec_arp_table *entry;
614 unsigned char *src, *dst;
615
616 atm_return(vcc, skb->truesize);
617 if (*(__be16 *) skb->data == htons(priv->lecid) ||
618 !priv->lecd || !(dev->flags & IFF_UP)) {
619 /*
620 * Probably looping back, or if lecd is missing,
621 * lecd has gone down
622 */
623 pr_debug("Ignoring frame...\n");
624 dev_kfree_skb(skb);
625 return;
626 }
627 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
628
629 /*
630 * If this is a Data Direct VCC, and the VCC does not match
631 * the LE_ARP cache entry, delete the LE_ARP cache entry.
632 */
633 spin_lock_irqsave(&priv->lec_arp_lock, flags);
634 if (lec_is_data_direct(vcc)) {
635 src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
636 entry = lec_arp_find(priv, src);
637 if (entry && entry->vcc != vcc) {
638 lec_arp_remove(priv, entry);
639 lec_arp_put(entry);
640 }
641 }
642 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
643
644 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
645 !priv->is_proxy && /* Proxy wants all the packets */
646 memcmp(dst, dev->dev_addr, dev->addr_len)) {
647 dev_kfree_skb(skb);
648 return;
649 }
650 if (!hlist_empty(&priv->lec_arp_empty_ones))
651 lec_arp_check_empties(priv, vcc, skb);
652 skb_pull(skb, 2); /* skip lec_id */
653 skb->protocol = eth_type_trans(skb, dev);
654 dev->stats.rx_packets++;
655 dev->stats.rx_bytes += skb->len;
656 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
657 netif_rx(skb);
658 }
659 }
660
661 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
662 {
663 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
664 struct net_device *dev = skb->dev;
665
666 if (vpriv == NULL) {
667 pr_info("vpriv = NULL!?!?!?\n");
668 return;
669 }
670
671 vpriv->old_pop(vcc, skb);
672
673 if (vpriv->xoff && atm_may_send(vcc, 0)) {
674 vpriv->xoff = 0;
675 if (netif_running(dev) && netif_queue_stopped(dev))
676 netif_wake_queue(dev);
677 }
678 }
679
680 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
681 {
682 struct lec_vcc_priv *vpriv;
683 int bytes_left;
684 struct atmlec_ioc ioc_data;
685
686 /* Lecd must be up in this case */
687 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
688 if (bytes_left != 0)
689 pr_info("copy from user failed for %d bytes\n", bytes_left);
690 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
691 !dev_lec[ioc_data.dev_num])
692 return -EINVAL;
693 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
694 if (!vpriv)
695 return -ENOMEM;
696 vpriv->xoff = 0;
697 vpriv->old_pop = vcc->pop;
698 vcc->user_back = vpriv;
699 vcc->pop = lec_pop;
700 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
701 &ioc_data, vcc, vcc->push);
702 vcc->proto_data = dev_lec[ioc_data.dev_num];
703 vcc->push = lec_push;
704 return 0;
705 }
706
707 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
708 {
709 if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
710 return -EINVAL;
711 vcc->proto_data = dev_lec[arg];
712 return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
713 }
714
715 /* Initialize device. */
716 static int lecd_attach(struct atm_vcc *vcc, int arg)
717 {
718 int i;
719 struct lec_priv *priv;
720
721 if (arg < 0)
722 i = 0;
723 else
724 i = arg;
725 if (arg >= MAX_LEC_ITF)
726 return -EINVAL;
727 if (!dev_lec[i]) {
728 int size;
729
730 size = sizeof(struct lec_priv);
731 dev_lec[i] = alloc_etherdev(size);
732 if (!dev_lec[i])
733 return -ENOMEM;
734 dev_lec[i]->netdev_ops = &lec_netdev_ops;
735 dev_lec[i]->max_mtu = 18190;
736 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
737 if (register_netdev(dev_lec[i])) {
738 free_netdev(dev_lec[i]);
739 return -EINVAL;
740 }
741
742 priv = netdev_priv(dev_lec[i]);
743 } else {
744 priv = netdev_priv(dev_lec[i]);
745 if (priv->lecd)
746 return -EADDRINUSE;
747 }
748 lec_arp_init(priv);
749 priv->itfnum = i; /* LANE2 addition */
750 priv->lecd = vcc;
751 vcc->dev = &lecatm_dev;
752 vcc_insert_socket(sk_atm(vcc));
753
754 vcc->proto_data = dev_lec[i];
755 set_bit(ATM_VF_META, &vcc->flags);
756 set_bit(ATM_VF_READY, &vcc->flags);
757
758 /* Set default values to these variables */
759 priv->maximum_unknown_frame_count = 1;
760 priv->max_unknown_frame_time = (1 * HZ);
761 priv->vcc_timeout_period = (1200 * HZ);
762 priv->max_retry_count = 1;
763 priv->aging_time = (300 * HZ);
764 priv->forward_delay_time = (15 * HZ);
765 priv->topology_change = 0;
766 priv->arp_response_time = (1 * HZ);
767 priv->flush_timeout = (4 * HZ);
768 priv->path_switching_delay = (6 * HZ);
769
770 if (dev_lec[i]->flags & IFF_UP)
771 netif_start_queue(dev_lec[i]);
772 __module_get(THIS_MODULE);
773 return i;
774 }
775
776 #ifdef CONFIG_PROC_FS
777 static const char *lec_arp_get_status_string(unsigned char status)
778 {
779 static const char *const lec_arp_status_string[] = {
780 "ESI_UNKNOWN ",
781 "ESI_ARP_PENDING ",
782 "ESI_VC_PENDING ",
783 "<Undefined> ",
784 "ESI_FLUSH_PENDING ",
785 "ESI_FORWARD_DIRECT"
786 };
787
788 if (status > ESI_FORWARD_DIRECT)
789 status = 3; /* ESI_UNDEFINED */
790 return lec_arp_status_string[status];
791 }
792
793 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
794 {
795 int i;
796
797 for (i = 0; i < ETH_ALEN; i++)
798 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
799 seq_printf(seq, " ");
800 for (i = 0; i < ATM_ESA_LEN; i++)
801 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
802 seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
803 entry->flags & 0xffff);
804 if (entry->vcc)
805 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
806 else
807 seq_printf(seq, " ");
808 if (entry->recv_vcc) {
809 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi,
810 entry->recv_vcc->vci);
811 }
812 seq_putc(seq, '\n');
813 }
814
815 struct lec_state {
816 unsigned long flags;
817 struct lec_priv *locked;
818 struct hlist_node *node;
819 struct net_device *dev;
820 int itf;
821 int arp_table;
822 int misc_table;
823 };
824
825 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
826 loff_t *l)
827 {
828 struct hlist_node *e = state->node;
829
830 if (!e)
831 e = tbl->first;
832 if (e == SEQ_START_TOKEN) {
833 e = tbl->first;
834 --*l;
835 }
836
837 for (; e; e = e->next) {
838 if (--*l < 0)
839 break;
840 }
841 state->node = e;
842
843 return (*l < 0) ? state : NULL;
844 }
845
846 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
847 struct lec_priv *priv)
848 {
849 void *v = NULL;
850 int p;
851
852 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
853 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
854 if (v)
855 break;
856 }
857 state->arp_table = p;
858 return v;
859 }
860
861 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
862 struct lec_priv *priv)
863 {
864 struct hlist_head *lec_misc_tables[] = {
865 &priv->lec_arp_empty_ones,
866 &priv->lec_no_forward,
867 &priv->mcast_fwds
868 };
869 void *v = NULL;
870 int q;
871
872 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
873 v = lec_tbl_walk(state, lec_misc_tables[q], l);
874 if (v)
875 break;
876 }
877 state->misc_table = q;
878 return v;
879 }
880
881 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
882 struct lec_priv *priv)
883 {
884 if (!state->locked) {
885 state->locked = priv;
886 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
887 }
888 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
889 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
890 state->locked = NULL;
891 /* Partial state reset for the next time we get called */
892 state->arp_table = state->misc_table = 0;
893 }
894 return state->locked;
895 }
896
897 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
898 {
899 struct net_device *dev;
900 void *v;
901
902 dev = state->dev ? state->dev : dev_lec[state->itf];
903 v = (dev && netdev_priv(dev)) ?
904 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
905 if (!v && dev) {
906 dev_put(dev);
907 /* Partial state reset for the next time we get called */
908 dev = NULL;
909 }
910 state->dev = dev;
911 return v;
912 }
913
914 static void *lec_get_idx(struct lec_state *state, loff_t l)
915 {
916 void *v = NULL;
917
918 for (; state->itf < MAX_LEC_ITF; state->itf++) {
919 v = lec_itf_walk(state, &l);
920 if (v)
921 break;
922 }
923 return v;
924 }
925
926 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
927 {
928 struct lec_state *state = seq->private;
929
930 state->itf = 0;
931 state->dev = NULL;
932 state->locked = NULL;
933 state->arp_table = 0;
934 state->misc_table = 0;
935 state->node = SEQ_START_TOKEN;
936
937 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
938 }
939
940 static void lec_seq_stop(struct seq_file *seq, void *v)
941 {
942 struct lec_state *state = seq->private;
943
944 if (state->dev) {
945 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
946 state->flags);
947 dev_put(state->dev);
948 }
949 }
950
951 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
952 {
953 struct lec_state *state = seq->private;
954
955 v = lec_get_idx(state, 1);
956 *pos += !!PTR_ERR(v);
957 return v;
958 }
959
960 static int lec_seq_show(struct seq_file *seq, void *v)
961 {
962 static const char lec_banner[] =
963 "Itf MAC ATM destination"
964 " Status Flags "
965 "VPI/VCI Recv VPI/VCI\n";
966
967 if (v == SEQ_START_TOKEN)
968 seq_puts(seq, lec_banner);
969 else {
970 struct lec_state *state = seq->private;
971 struct net_device *dev = state->dev;
972 struct lec_arp_table *entry = hlist_entry(state->node,
973 struct lec_arp_table,
974 next);
975
976 seq_printf(seq, "%s ", dev->name);
977 lec_info(seq, entry);
978 }
979 return 0;
980 }
981
982 static const struct seq_operations lec_seq_ops = {
983 .start = lec_seq_start,
984 .next = lec_seq_next,
985 .stop = lec_seq_stop,
986 .show = lec_seq_show,
987 };
988
989 static int lec_seq_open(struct inode *inode, struct file *file)
990 {
991 return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
992 }
993
994 static const struct file_operations lec_seq_fops = {
995 .owner = THIS_MODULE,
996 .open = lec_seq_open,
997 .read = seq_read,
998 .llseek = seq_lseek,
999 .release = seq_release_private,
1000 };
1001 #endif
1002
1003 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1004 {
1005 struct atm_vcc *vcc = ATM_SD(sock);
1006 int err = 0;
1007
1008 switch (cmd) {
1009 case ATMLEC_CTRL:
1010 case ATMLEC_MCAST:
1011 case ATMLEC_DATA:
1012 if (!capable(CAP_NET_ADMIN))
1013 return -EPERM;
1014 break;
1015 default:
1016 return -ENOIOCTLCMD;
1017 }
1018
1019 switch (cmd) {
1020 case ATMLEC_CTRL:
1021 err = lecd_attach(vcc, (int)arg);
1022 if (err >= 0)
1023 sock->state = SS_CONNECTED;
1024 break;
1025 case ATMLEC_MCAST:
1026 err = lec_mcast_attach(vcc, (int)arg);
1027 break;
1028 case ATMLEC_DATA:
1029 err = lec_vcc_attach(vcc, (void __user *)arg);
1030 break;
1031 }
1032
1033 return err;
1034 }
1035
1036 static struct atm_ioctl lane_ioctl_ops = {
1037 .owner = THIS_MODULE,
1038 .ioctl = lane_ioctl,
1039 };
1040
1041 static int __init lane_module_init(void)
1042 {
1043 #ifdef CONFIG_PROC_FS
1044 struct proc_dir_entry *p;
1045
1046 p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1047 if (!p) {
1048 pr_err("Unable to initialize /proc/net/atm/lec\n");
1049 return -ENOMEM;
1050 }
1051 #endif
1052
1053 register_atm_ioctl(&lane_ioctl_ops);
1054 pr_info("lec.c: initialized\n");
1055 return 0;
1056 }
1057
1058 static void __exit lane_module_cleanup(void)
1059 {
1060 int i;
1061
1062 #ifdef CONFIG_PROC_FS
1063 remove_proc_entry("lec", atm_proc_root);
1064 #endif
1065
1066 deregister_atm_ioctl(&lane_ioctl_ops);
1067
1068 for (i = 0; i < MAX_LEC_ITF; i++) {
1069 if (dev_lec[i] != NULL) {
1070 unregister_netdev(dev_lec[i]);
1071 free_netdev(dev_lec[i]);
1072 dev_lec[i] = NULL;
1073 }
1074 }
1075 }
1076
1077 module_init(lane_module_init);
1078 module_exit(lane_module_cleanup);
1079
1080 /*
1081 * LANE2: 3.1.3, LE_RESOLVE.request
1082 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1083 * If sizeoftlvs == NULL the default TLVs associated with with this
1084 * lec will be used.
1085 * If dst_mac == NULL, targetless LE_ARP will be sent
1086 */
1087 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1088 u8 **tlvs, u32 *sizeoftlvs)
1089 {
1090 unsigned long flags;
1091 struct lec_priv *priv = netdev_priv(dev);
1092 struct lec_arp_table *table;
1093 struct sk_buff *skb;
1094 int retval;
1095
1096 if (force == 0) {
1097 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1098 table = lec_arp_find(priv, dst_mac);
1099 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1100 if (table == NULL)
1101 return -1;
1102
1103 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1104 if (*tlvs == NULL)
1105 return -1;
1106
1107 *sizeoftlvs = table->sizeoftlvs;
1108
1109 return 0;
1110 }
1111
1112 if (sizeoftlvs == NULL)
1113 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1114
1115 else {
1116 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1117 if (skb == NULL)
1118 return -1;
1119 skb->len = *sizeoftlvs;
1120 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1121 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1122 }
1123 return retval;
1124 }
1125
1126 /*
1127 * LANE2: 3.1.4, LE_ASSOCIATE.request
1128 * Associate the *tlvs with the *lan_dst address.
1129 * Will overwrite any previous association
1130 * Returns 1 for success, 0 for failure (out of memory)
1131 *
1132 */
1133 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1134 const u8 *tlvs, u32 sizeoftlvs)
1135 {
1136 int retval;
1137 struct sk_buff *skb;
1138 struct lec_priv *priv = netdev_priv(dev);
1139
1140 if (!ether_addr_equal(lan_dst, dev->dev_addr))
1141 return 0; /* not our mac address */
1142
1143 kfree(priv->tlvs); /* NULL if there was no previous association */
1144
1145 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1146 if (priv->tlvs == NULL)
1147 return 0;
1148 priv->sizeoftlvs = sizeoftlvs;
1149
1150 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1151 if (skb == NULL)
1152 return 0;
1153 skb->len = sizeoftlvs;
1154 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1155 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1156 if (retval != 0)
1157 pr_info("lec.c: lane2_associate_req() failed\n");
1158 /*
1159 * If the previous association has changed we must
1160 * somehow notify other LANE entities about the change
1161 */
1162 return 1;
1163 }
1164
1165 /*
1166 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1167 *
1168 */
1169 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1170 const u8 *tlvs, u32 sizeoftlvs)
1171 {
1172 #if 0
1173 int i = 0;
1174 #endif
1175 struct lec_priv *priv = netdev_priv(dev);
1176 #if 0 /*
1177 * Why have the TLVs in LE_ARP entries
1178 * since we do not use them? When you
1179 * uncomment this code, make sure the
1180 * TLVs get freed when entry is killed
1181 */
1182 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1183
1184 if (entry == NULL)
1185 return; /* should not happen */
1186
1187 kfree(entry->tlvs);
1188
1189 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1190 if (entry->tlvs == NULL)
1191 return;
1192 entry->sizeoftlvs = sizeoftlvs;
1193 #endif
1194 #if 0
1195 pr_info("\n");
1196 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1197 while (i < sizeoftlvs)
1198 pr_cont("%02x ", tlvs[i++]);
1199
1200 pr_cont("\n");
1201 #endif
1202
1203 /* tell MPOA about the TLVs we saw */
1204 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1205 priv->lane2_ops->associate_indicator(dev, mac_addr,
1206 tlvs, sizeoftlvs);
1207 }
1208 }
1209
1210 /*
1211 * Here starts what used to lec_arpc.c
1212 *
1213 * lec_arpc.c was added here when making
1214 * lane client modular. October 1997
1215 */
1216
1217 #include <linux/types.h>
1218 #include <linux/timer.h>
1219 #include <linux/param.h>
1220 #include <linux/atomic.h>
1221 #include <linux/inetdevice.h>
1222 #include <net/route.h>
1223
1224 #if 0
1225 #define pr_debug(format, args...)
1226 /*
1227 #define pr_debug printk
1228 */
1229 #endif
1230 #define DEBUG_ARP_TABLE 0
1231
1232 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1233
1234 static void lec_arp_check_expire(struct work_struct *work);
1235 static void lec_arp_expire_arp(struct timer_list *t);
1236
1237 /*
1238 * Arp table funcs
1239 */
1240
1241 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1242
1243 /*
1244 * Initialization of arp-cache
1245 */
1246 static void lec_arp_init(struct lec_priv *priv)
1247 {
1248 unsigned short i;
1249
1250 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1251 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1252 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1253 INIT_HLIST_HEAD(&priv->lec_no_forward);
1254 INIT_HLIST_HEAD(&priv->mcast_fwds);
1255 spin_lock_init(&priv->lec_arp_lock);
1256 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1257 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1258 }
1259
1260 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1261 {
1262 if (entry->vcc) {
1263 struct atm_vcc *vcc = entry->vcc;
1264 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1265 struct net_device *dev = (struct net_device *)vcc->proto_data;
1266
1267 vcc->pop = vpriv->old_pop;
1268 if (vpriv->xoff)
1269 netif_wake_queue(dev);
1270 kfree(vpriv);
1271 vcc->user_back = NULL;
1272 vcc->push = entry->old_push;
1273 vcc_release_async(vcc, -EPIPE);
1274 entry->vcc = NULL;
1275 }
1276 if (entry->recv_vcc) {
1277 entry->recv_vcc->push = entry->old_recv_push;
1278 vcc_release_async(entry->recv_vcc, -EPIPE);
1279 entry->recv_vcc = NULL;
1280 }
1281 }
1282
1283 /*
1284 * Insert entry to lec_arp_table
1285 * LANE2: Add to the end of the list to satisfy 8.1.13
1286 */
1287 static inline void
1288 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1289 {
1290 struct hlist_head *tmp;
1291
1292 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1293 hlist_add_head(&entry->next, tmp);
1294
1295 pr_debug("Added entry:%pM\n", entry->mac_addr);
1296 }
1297
1298 /*
1299 * Remove entry from lec_arp_table
1300 */
1301 static int
1302 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1303 {
1304 struct lec_arp_table *entry;
1305 int i, remove_vcc = 1;
1306
1307 if (!to_remove)
1308 return -1;
1309
1310 hlist_del(&to_remove->next);
1311 del_timer(&to_remove->timer);
1312
1313 /*
1314 * If this is the only MAC connected to this VCC,
1315 * also tear down the VCC
1316 */
1317 if (to_remove->status >= ESI_FLUSH_PENDING) {
1318 /*
1319 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1320 */
1321 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1322 hlist_for_each_entry(entry,
1323 &priv->lec_arp_tables[i], next) {
1324 if (memcmp(to_remove->atm_addr,
1325 entry->atm_addr, ATM_ESA_LEN) == 0) {
1326 remove_vcc = 0;
1327 break;
1328 }
1329 }
1330 }
1331 if (remove_vcc)
1332 lec_arp_clear_vccs(to_remove);
1333 }
1334 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */
1335
1336 pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1337 return 0;
1338 }
1339
1340 #if DEBUG_ARP_TABLE
1341 static const char *get_status_string(unsigned char st)
1342 {
1343 switch (st) {
1344 case ESI_UNKNOWN:
1345 return "ESI_UNKNOWN";
1346 case ESI_ARP_PENDING:
1347 return "ESI_ARP_PENDING";
1348 case ESI_VC_PENDING:
1349 return "ESI_VC_PENDING";
1350 case ESI_FLUSH_PENDING:
1351 return "ESI_FLUSH_PENDING";
1352 case ESI_FORWARD_DIRECT:
1353 return "ESI_FORWARD_DIRECT";
1354 }
1355 return "<UNKNOWN>";
1356 }
1357
1358 static void dump_arp_table(struct lec_priv *priv)
1359 {
1360 struct lec_arp_table *rulla;
1361 char buf[256];
1362 int i, j, offset;
1363
1364 pr_info("Dump %p:\n", priv);
1365 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1366 hlist_for_each_entry(rulla,
1367 &priv->lec_arp_tables[i], next) {
1368 offset = 0;
1369 offset += sprintf(buf, "%d: %p\n", i, rulla);
1370 offset += sprintf(buf + offset, "Mac: %pM",
1371 rulla->mac_addr);
1372 offset += sprintf(buf + offset, " Atm:");
1373 for (j = 0; j < ATM_ESA_LEN; j++) {
1374 offset += sprintf(buf + offset,
1375 "%2.2x ",
1376 rulla->atm_addr[j] & 0xff);
1377 }
1378 offset += sprintf(buf + offset,
1379 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1380 rulla->vcc ? rulla->vcc->vpi : 0,
1381 rulla->vcc ? rulla->vcc->vci : 0,
1382 rulla->recv_vcc ? rulla->recv_vcc->
1383 vpi : 0,
1384 rulla->recv_vcc ? rulla->recv_vcc->
1385 vci : 0, rulla->last_used,
1386 rulla->timestamp, rulla->no_tries);
1387 offset +=
1388 sprintf(buf + offset,
1389 "Flags:%x, Packets_flooded:%x, Status: %s ",
1390 rulla->flags, rulla->packets_flooded,
1391 get_status_string(rulla->status));
1392 pr_info("%s\n", buf);
1393 }
1394 }
1395
1396 if (!hlist_empty(&priv->lec_no_forward))
1397 pr_info("No forward\n");
1398 hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1399 offset = 0;
1400 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1401 offset += sprintf(buf + offset, " Atm:");
1402 for (j = 0; j < ATM_ESA_LEN; j++) {
1403 offset += sprintf(buf + offset, "%2.2x ",
1404 rulla->atm_addr[j] & 0xff);
1405 }
1406 offset += sprintf(buf + offset,
1407 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1408 rulla->vcc ? rulla->vcc->vpi : 0,
1409 rulla->vcc ? rulla->vcc->vci : 0,
1410 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1411 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1412 rulla->last_used,
1413 rulla->timestamp, rulla->no_tries);
1414 offset += sprintf(buf + offset,
1415 "Flags:%x, Packets_flooded:%x, Status: %s ",
1416 rulla->flags, rulla->packets_flooded,
1417 get_status_string(rulla->status));
1418 pr_info("%s\n", buf);
1419 }
1420
1421 if (!hlist_empty(&priv->lec_arp_empty_ones))
1422 pr_info("Empty ones\n");
1423 hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1424 offset = 0;
1425 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1426 offset += sprintf(buf + offset, " Atm:");
1427 for (j = 0; j < ATM_ESA_LEN; j++) {
1428 offset += sprintf(buf + offset, "%2.2x ",
1429 rulla->atm_addr[j] & 0xff);
1430 }
1431 offset += sprintf(buf + offset,
1432 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1433 rulla->vcc ? rulla->vcc->vpi : 0,
1434 rulla->vcc ? rulla->vcc->vci : 0,
1435 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1436 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1437 rulla->last_used,
1438 rulla->timestamp, rulla->no_tries);
1439 offset += sprintf(buf + offset,
1440 "Flags:%x, Packets_flooded:%x, Status: %s ",
1441 rulla->flags, rulla->packets_flooded,
1442 get_status_string(rulla->status));
1443 pr_info("%s", buf);
1444 }
1445
1446 if (!hlist_empty(&priv->mcast_fwds))
1447 pr_info("Multicast Forward VCCs\n");
1448 hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1449 offset = 0;
1450 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1451 offset += sprintf(buf + offset, " Atm:");
1452 for (j = 0; j < ATM_ESA_LEN; j++) {
1453 offset += sprintf(buf + offset, "%2.2x ",
1454 rulla->atm_addr[j] & 0xff);
1455 }
1456 offset += sprintf(buf + offset,
1457 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1458 rulla->vcc ? rulla->vcc->vpi : 0,
1459 rulla->vcc ? rulla->vcc->vci : 0,
1460 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1461 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1462 rulla->last_used,
1463 rulla->timestamp, rulla->no_tries);
1464 offset += sprintf(buf + offset,
1465 "Flags:%x, Packets_flooded:%x, Status: %s ",
1466 rulla->flags, rulla->packets_flooded,
1467 get_status_string(rulla->status));
1468 pr_info("%s\n", buf);
1469 }
1470
1471 }
1472 #else
1473 #define dump_arp_table(priv) do { } while (0)
1474 #endif
1475
1476 /*
1477 * Destruction of arp-cache
1478 */
1479 static void lec_arp_destroy(struct lec_priv *priv)
1480 {
1481 unsigned long flags;
1482 struct hlist_node *next;
1483 struct lec_arp_table *entry;
1484 int i;
1485
1486 cancel_delayed_work_sync(&priv->lec_arp_work);
1487
1488 /*
1489 * Remove all entries
1490 */
1491
1492 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1493 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1494 hlist_for_each_entry_safe(entry, next,
1495 &priv->lec_arp_tables[i], next) {
1496 lec_arp_remove(priv, entry);
1497 lec_arp_put(entry);
1498 }
1499 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1500 }
1501
1502 hlist_for_each_entry_safe(entry, next,
1503 &priv->lec_arp_empty_ones, next) {
1504 del_timer_sync(&entry->timer);
1505 lec_arp_clear_vccs(entry);
1506 hlist_del(&entry->next);
1507 lec_arp_put(entry);
1508 }
1509 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1510
1511 hlist_for_each_entry_safe(entry, next,
1512 &priv->lec_no_forward, next) {
1513 del_timer_sync(&entry->timer);
1514 lec_arp_clear_vccs(entry);
1515 hlist_del(&entry->next);
1516 lec_arp_put(entry);
1517 }
1518 INIT_HLIST_HEAD(&priv->lec_no_forward);
1519
1520 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1521 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1522 lec_arp_clear_vccs(entry);
1523 hlist_del(&entry->next);
1524 lec_arp_put(entry);
1525 }
1526 INIT_HLIST_HEAD(&priv->mcast_fwds);
1527 priv->mcast_vcc = NULL;
1528 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1529 }
1530
1531 /*
1532 * Find entry by mac_address
1533 */
1534 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1535 const unsigned char *mac_addr)
1536 {
1537 struct hlist_head *head;
1538 struct lec_arp_table *entry;
1539
1540 pr_debug("%pM\n", mac_addr);
1541
1542 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1543 hlist_for_each_entry(entry, head, next) {
1544 if (ether_addr_equal(mac_addr, entry->mac_addr))
1545 return entry;
1546 }
1547 return NULL;
1548 }
1549
1550 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1551 const unsigned char *mac_addr)
1552 {
1553 struct lec_arp_table *to_return;
1554
1555 to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1556 if (!to_return) {
1557 pr_info("LEC: Arp entry kmalloc failed\n");
1558 return NULL;
1559 }
1560 ether_addr_copy(to_return->mac_addr, mac_addr);
1561 INIT_HLIST_NODE(&to_return->next);
1562 timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
1563 to_return->last_used = jiffies;
1564 to_return->priv = priv;
1565 skb_queue_head_init(&to_return->tx_wait);
1566 refcount_set(&to_return->usage, 1);
1567 return to_return;
1568 }
1569
1570 /* Arp sent timer expired */
1571 static void lec_arp_expire_arp(struct timer_list *t)
1572 {
1573 struct lec_arp_table *entry;
1574
1575 entry = from_timer(entry, t, timer);
1576
1577 pr_debug("\n");
1578 if (entry->status == ESI_ARP_PENDING) {
1579 if (entry->no_tries <= entry->priv->max_retry_count) {
1580 if (entry->is_rdesc)
1581 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1582 entry->mac_addr, NULL, NULL);
1583 else
1584 send_to_lecd(entry->priv, l_arp_xmt,
1585 entry->mac_addr, NULL, NULL);
1586 entry->no_tries++;
1587 }
1588 mod_timer(&entry->timer, jiffies + (1 * HZ));
1589 }
1590 }
1591
1592 /* Unknown/unused vcc expire, remove associated entry */
1593 static void lec_arp_expire_vcc(struct timer_list *t)
1594 {
1595 unsigned long flags;
1596 struct lec_arp_table *to_remove = from_timer(to_remove, t, timer);
1597 struct lec_priv *priv = to_remove->priv;
1598
1599 del_timer(&to_remove->timer);
1600
1601 pr_debug("%p %p: vpi:%d vci:%d\n",
1602 to_remove, priv,
1603 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1604 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1605
1606 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1607 hlist_del(&to_remove->next);
1608 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1609
1610 lec_arp_clear_vccs(to_remove);
1611 lec_arp_put(to_remove);
1612 }
1613
1614 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1615 unsigned long now,
1616 struct lec_priv *priv)
1617 {
1618 unsigned long time_to_check;
1619
1620 if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1621 time_to_check = priv->forward_delay_time;
1622 else
1623 time_to_check = priv->aging_time;
1624
1625 pr_debug("About to expire: %lx - %lx > %lx\n",
1626 now, entry->last_used, time_to_check);
1627 if (time_after(now, entry->last_used + time_to_check) &&
1628 !(entry->flags & LEC_PERMANENT_FLAG) &&
1629 !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */
1630 /* Remove entry */
1631 pr_debug("Entry timed out\n");
1632 lec_arp_remove(priv, entry);
1633 lec_arp_put(entry);
1634 } else {
1635 /* Something else */
1636 if ((entry->status == ESI_VC_PENDING ||
1637 entry->status == ESI_ARP_PENDING) &&
1638 time_after_eq(now, entry->timestamp +
1639 priv->max_unknown_frame_time)) {
1640 entry->timestamp = jiffies;
1641 entry->packets_flooded = 0;
1642 if (entry->status == ESI_VC_PENDING)
1643 send_to_lecd(priv, l_svc_setup,
1644 entry->mac_addr,
1645 entry->atm_addr,
1646 NULL);
1647 }
1648 if (entry->status == ESI_FLUSH_PENDING &&
1649 time_after_eq(now, entry->timestamp +
1650 priv->path_switching_delay)) {
1651 lec_arp_hold(entry);
1652 return true;
1653 }
1654 }
1655
1656 return false;
1657 }
1658 /*
1659 * Expire entries.
1660 * 1. Re-set timer
1661 * 2. For each entry, delete entries that have aged past the age limit.
1662 * 3. For each entry, depending on the status of the entry, perform
1663 * the following maintenance.
1664 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1665 * tick_count is above the max_unknown_frame_time, clear
1666 * the tick_count to zero and clear the packets_flooded counter
1667 * to zero. This supports the packet rate limit per address
1668 * while flooding unknowns.
1669 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1670 * than or equal to the path_switching_delay, change the status
1671 * to ESI_FORWARD_DIRECT. This causes the flush period to end
1672 * regardless of the progress of the flush protocol.
1673 */
1674 static void lec_arp_check_expire(struct work_struct *work)
1675 {
1676 unsigned long flags;
1677 struct lec_priv *priv =
1678 container_of(work, struct lec_priv, lec_arp_work.work);
1679 struct hlist_node *next;
1680 struct lec_arp_table *entry;
1681 unsigned long now;
1682 int i;
1683
1684 pr_debug("%p\n", priv);
1685 now = jiffies;
1686 restart:
1687 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1688 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1689 hlist_for_each_entry_safe(entry, next,
1690 &priv->lec_arp_tables[i], next) {
1691 if (__lec_arp_check_expire(entry, now, priv)) {
1692 struct sk_buff *skb;
1693 struct atm_vcc *vcc = entry->vcc;
1694
1695 spin_unlock_irqrestore(&priv->lec_arp_lock,
1696 flags);
1697 while ((skb = skb_dequeue(&entry->tx_wait)))
1698 lec_send(vcc, skb);
1699 entry->last_used = jiffies;
1700 entry->status = ESI_FORWARD_DIRECT;
1701 lec_arp_put(entry);
1702
1703 goto restart;
1704 }
1705 }
1706 }
1707 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1708
1709 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1710 }
1711
1712 /*
1713 * Try to find vcc where mac_address is attached.
1714 *
1715 */
1716 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1717 const unsigned char *mac_to_find,
1718 int is_rdesc,
1719 struct lec_arp_table **ret_entry)
1720 {
1721 unsigned long flags;
1722 struct lec_arp_table *entry;
1723 struct atm_vcc *found;
1724
1725 if (mac_to_find[0] & 0x01) {
1726 switch (priv->lane_version) {
1727 case 1:
1728 return priv->mcast_vcc;
1729 case 2: /* LANE2 wants arp for multicast addresses */
1730 if (ether_addr_equal(mac_to_find, bus_mac))
1731 return priv->mcast_vcc;
1732 break;
1733 default:
1734 break;
1735 }
1736 }
1737
1738 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1739 entry = lec_arp_find(priv, mac_to_find);
1740
1741 if (entry) {
1742 if (entry->status == ESI_FORWARD_DIRECT) {
1743 /* Connection Ok */
1744 entry->last_used = jiffies;
1745 lec_arp_hold(entry);
1746 *ret_entry = entry;
1747 found = entry->vcc;
1748 goto out;
1749 }
1750 /*
1751 * If the LE_ARP cache entry is still pending, reset count to 0
1752 * so another LE_ARP request can be made for this frame.
1753 */
1754 if (entry->status == ESI_ARP_PENDING)
1755 entry->no_tries = 0;
1756 /*
1757 * Data direct VC not yet set up, check to see if the unknown
1758 * frame count is greater than the limit. If the limit has
1759 * not been reached, allow the caller to send packet to
1760 * BUS.
1761 */
1762 if (entry->status != ESI_FLUSH_PENDING &&
1763 entry->packets_flooded <
1764 priv->maximum_unknown_frame_count) {
1765 entry->packets_flooded++;
1766 pr_debug("Flooding..\n");
1767 found = priv->mcast_vcc;
1768 goto out;
1769 }
1770 /*
1771 * We got here because entry->status == ESI_FLUSH_PENDING
1772 * or BUS flood limit was reached for an entry which is
1773 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1774 */
1775 lec_arp_hold(entry);
1776 *ret_entry = entry;
1777 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1778 entry->vcc);
1779 found = NULL;
1780 } else {
1781 /* No matching entry was found */
1782 entry = make_entry(priv, mac_to_find);
1783 pr_debug("Making entry\n");
1784 if (!entry) {
1785 found = priv->mcast_vcc;
1786 goto out;
1787 }
1788 lec_arp_add(priv, entry);
1789 /* We want arp-request(s) to be sent */
1790 entry->packets_flooded = 1;
1791 entry->status = ESI_ARP_PENDING;
1792 entry->no_tries = 1;
1793 entry->last_used = entry->timestamp = jiffies;
1794 entry->is_rdesc = is_rdesc;
1795 if (entry->is_rdesc)
1796 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1797 NULL);
1798 else
1799 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1800 entry->timer.expires = jiffies + (1 * HZ);
1801 entry->timer.function = lec_arp_expire_arp;
1802 add_timer(&entry->timer);
1803 found = priv->mcast_vcc;
1804 }
1805
1806 out:
1807 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1808 return found;
1809 }
1810
1811 static int
1812 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1813 unsigned long permanent)
1814 {
1815 unsigned long flags;
1816 struct hlist_node *next;
1817 struct lec_arp_table *entry;
1818 int i;
1819
1820 pr_debug("\n");
1821 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1822 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1823 hlist_for_each_entry_safe(entry, next,
1824 &priv->lec_arp_tables[i], next) {
1825 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1826 (permanent ||
1827 !(entry->flags & LEC_PERMANENT_FLAG))) {
1828 lec_arp_remove(priv, entry);
1829 lec_arp_put(entry);
1830 }
1831 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1832 return 0;
1833 }
1834 }
1835 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1836 return -1;
1837 }
1838
1839 /*
1840 * Notifies: Response to arp_request (atm_addr != NULL)
1841 */
1842 static void
1843 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1844 const unsigned char *atm_addr, unsigned long remoteflag,
1845 unsigned int targetless_le_arp)
1846 {
1847 unsigned long flags;
1848 struct hlist_node *next;
1849 struct lec_arp_table *entry, *tmp;
1850 int i;
1851
1852 pr_debug("%smac:%pM\n",
1853 (targetless_le_arp) ? "targetless " : "", mac_addr);
1854
1855 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1856 entry = lec_arp_find(priv, mac_addr);
1857 if (entry == NULL && targetless_le_arp)
1858 goto out; /*
1859 * LANE2: ignore targetless LE_ARPs for which
1860 * we have no entry in the cache. 7.1.30
1861 */
1862 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1863 hlist_for_each_entry_safe(entry, next,
1864 &priv->lec_arp_empty_ones, next) {
1865 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1866 hlist_del(&entry->next);
1867 del_timer(&entry->timer);
1868 tmp = lec_arp_find(priv, mac_addr);
1869 if (tmp) {
1870 del_timer(&tmp->timer);
1871 tmp->status = ESI_FORWARD_DIRECT;
1872 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1873 tmp->vcc = entry->vcc;
1874 tmp->old_push = entry->old_push;
1875 tmp->last_used = jiffies;
1876 del_timer(&entry->timer);
1877 lec_arp_put(entry);
1878 entry = tmp;
1879 } else {
1880 entry->status = ESI_FORWARD_DIRECT;
1881 ether_addr_copy(entry->mac_addr,
1882 mac_addr);
1883 entry->last_used = jiffies;
1884 lec_arp_add(priv, entry);
1885 }
1886 if (remoteflag)
1887 entry->flags |= LEC_REMOTE_FLAG;
1888 else
1889 entry->flags &= ~LEC_REMOTE_FLAG;
1890 pr_debug("After update\n");
1891 dump_arp_table(priv);
1892 goto out;
1893 }
1894 }
1895 }
1896
1897 entry = lec_arp_find(priv, mac_addr);
1898 if (!entry) {
1899 entry = make_entry(priv, mac_addr);
1900 if (!entry)
1901 goto out;
1902 entry->status = ESI_UNKNOWN;
1903 lec_arp_add(priv, entry);
1904 /* Temporary, changes before end of function */
1905 }
1906 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1907 del_timer(&entry->timer);
1908 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1909 hlist_for_each_entry(tmp,
1910 &priv->lec_arp_tables[i], next) {
1911 if (entry != tmp &&
1912 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1913 /* Vcc to this host exists */
1914 if (tmp->status > ESI_VC_PENDING) {
1915 /*
1916 * ESI_FLUSH_PENDING,
1917 * ESI_FORWARD_DIRECT
1918 */
1919 entry->vcc = tmp->vcc;
1920 entry->old_push = tmp->old_push;
1921 }
1922 entry->status = tmp->status;
1923 break;
1924 }
1925 }
1926 }
1927 if (remoteflag)
1928 entry->flags |= LEC_REMOTE_FLAG;
1929 else
1930 entry->flags &= ~LEC_REMOTE_FLAG;
1931 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1932 entry->status = ESI_VC_PENDING;
1933 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1934 }
1935 pr_debug("After update2\n");
1936 dump_arp_table(priv);
1937 out:
1938 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1939 }
1940
1941 /*
1942 * Notifies: Vcc setup ready
1943 */
1944 static void
1945 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1946 struct atm_vcc *vcc,
1947 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1948 {
1949 unsigned long flags;
1950 struct lec_arp_table *entry;
1951 int i, found_entry = 0;
1952
1953 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1954 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1955 if (ioc_data->receive == 2) {
1956 pr_debug("LEC_ARP: Attaching mcast forward\n");
1957 #if 0
1958 entry = lec_arp_find(priv, bus_mac);
1959 if (!entry) {
1960 pr_info("LEC_ARP: Multicast entry not found!\n");
1961 goto out;
1962 }
1963 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1964 entry->recv_vcc = vcc;
1965 entry->old_recv_push = old_push;
1966 #endif
1967 entry = make_entry(priv, bus_mac);
1968 if (entry == NULL)
1969 goto out;
1970 del_timer(&entry->timer);
1971 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1972 entry->recv_vcc = vcc;
1973 entry->old_recv_push = old_push;
1974 hlist_add_head(&entry->next, &priv->mcast_fwds);
1975 goto out;
1976 } else if (ioc_data->receive == 1) {
1977 /*
1978 * Vcc which we don't want to make default vcc,
1979 * attach it anyway.
1980 */
1981 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",
1982 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
1983 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
1984 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
1985 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
1986 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
1987 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
1988 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
1989 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
1990 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
1991 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
1992 entry = make_entry(priv, bus_mac);
1993 if (entry == NULL)
1994 goto out;
1995 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1996 eth_zero_addr(entry->mac_addr);
1997 entry->recv_vcc = vcc;
1998 entry->old_recv_push = old_push;
1999 entry->status = ESI_UNKNOWN;
2000 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2001 entry->timer.function = lec_arp_expire_vcc;
2002 hlist_add_head(&entry->next, &priv->lec_no_forward);
2003 add_timer(&entry->timer);
2004 dump_arp_table(priv);
2005 goto out;
2006 }
2007 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",
2008 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2009 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2010 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2011 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2012 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2013 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2014 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2015 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2016 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2017 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2018 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2019 hlist_for_each_entry(entry,
2020 &priv->lec_arp_tables[i], next) {
2021 if (memcmp
2022 (ioc_data->atm_addr, entry->atm_addr,
2023 ATM_ESA_LEN) == 0) {
2024 pr_debug("LEC_ARP: Attaching data direct\n");
2025 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2026 entry->vcc ? entry->vcc->vci : 0,
2027 entry->recv_vcc ? entry->recv_vcc->
2028 vci : 0);
2029 found_entry = 1;
2030 del_timer(&entry->timer);
2031 entry->vcc = vcc;
2032 entry->old_push = old_push;
2033 if (entry->status == ESI_VC_PENDING) {
2034 if (priv->maximum_unknown_frame_count
2035 == 0)
2036 entry->status =
2037 ESI_FORWARD_DIRECT;
2038 else {
2039 entry->timestamp = jiffies;
2040 entry->status =
2041 ESI_FLUSH_PENDING;
2042 #if 0
2043 send_to_lecd(priv, l_flush_xmt,
2044 NULL,
2045 entry->atm_addr,
2046 NULL);
2047 #endif
2048 }
2049 } else {
2050 /*
2051 * They were forming a connection
2052 * to us, and we to them. Our
2053 * ATM address is numerically lower
2054 * than theirs, so we make connection
2055 * we formed into default VCC (8.1.11).
2056 * Connection they made gets torn
2057 * down. This might confuse some
2058 * clients. Can be changed if
2059 * someone reports trouble...
2060 */
2061 ;
2062 }
2063 }
2064 }
2065 }
2066 if (found_entry) {
2067 pr_debug("After vcc was added\n");
2068 dump_arp_table(priv);
2069 goto out;
2070 }
2071 /*
2072 * Not found, snatch address from first data packet that arrives
2073 * from this vcc
2074 */
2075 entry = make_entry(priv, bus_mac);
2076 if (!entry)
2077 goto out;
2078 entry->vcc = vcc;
2079 entry->old_push = old_push;
2080 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2081 eth_zero_addr(entry->mac_addr);
2082 entry->status = ESI_UNKNOWN;
2083 hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2084 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2085 entry->timer.function = lec_arp_expire_vcc;
2086 add_timer(&entry->timer);
2087 pr_debug("After vcc was added\n");
2088 dump_arp_table(priv);
2089 out:
2090 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2091 }
2092
2093 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2094 {
2095 unsigned long flags;
2096 struct lec_arp_table *entry;
2097 int i;
2098
2099 pr_debug("%lx\n", tran_id);
2100 restart:
2101 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2102 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2103 hlist_for_each_entry(entry,
2104 &priv->lec_arp_tables[i], next) {
2105 if (entry->flush_tran_id == tran_id &&
2106 entry->status == ESI_FLUSH_PENDING) {
2107 struct sk_buff *skb;
2108 struct atm_vcc *vcc = entry->vcc;
2109
2110 lec_arp_hold(entry);
2111 spin_unlock_irqrestore(&priv->lec_arp_lock,
2112 flags);
2113 while ((skb = skb_dequeue(&entry->tx_wait)))
2114 lec_send(vcc, skb);
2115 entry->last_used = jiffies;
2116 entry->status = ESI_FORWARD_DIRECT;
2117 lec_arp_put(entry);
2118 pr_debug("LEC_ARP: Flushed\n");
2119 goto restart;
2120 }
2121 }
2122 }
2123 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2124 dump_arp_table(priv);
2125 }
2126
2127 static void
2128 lec_set_flush_tran_id(struct lec_priv *priv,
2129 const unsigned char *atm_addr, unsigned long tran_id)
2130 {
2131 unsigned long flags;
2132 struct lec_arp_table *entry;
2133 int i;
2134
2135 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2136 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2137 hlist_for_each_entry(entry,
2138 &priv->lec_arp_tables[i], next) {
2139 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2140 entry->flush_tran_id = tran_id;
2141 pr_debug("Set flush transaction id to %lx for %p\n",
2142 tran_id, entry);
2143 }
2144 }
2145 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2146 }
2147
2148 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2149 {
2150 unsigned long flags;
2151 unsigned char mac_addr[] = {
2152 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2153 };
2154 struct lec_arp_table *to_add;
2155 struct lec_vcc_priv *vpriv;
2156 int err = 0;
2157
2158 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2159 if (!vpriv)
2160 return -ENOMEM;
2161 vpriv->xoff = 0;
2162 vpriv->old_pop = vcc->pop;
2163 vcc->user_back = vpriv;
2164 vcc->pop = lec_pop;
2165 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2166 to_add = make_entry(priv, mac_addr);
2167 if (!to_add) {
2168 vcc->pop = vpriv->old_pop;
2169 kfree(vpriv);
2170 err = -ENOMEM;
2171 goto out;
2172 }
2173 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2174 to_add->status = ESI_FORWARD_DIRECT;
2175 to_add->flags |= LEC_PERMANENT_FLAG;
2176 to_add->vcc = vcc;
2177 to_add->old_push = vcc->push;
2178 vcc->push = lec_push;
2179 priv->mcast_vcc = vcc;
2180 lec_arp_add(priv, to_add);
2181 out:
2182 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2183 return err;
2184 }
2185
2186 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2187 {
2188 unsigned long flags;
2189 struct hlist_node *next;
2190 struct lec_arp_table *entry;
2191 int i;
2192
2193 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2194 dump_arp_table(priv);
2195
2196 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2197
2198 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2199 hlist_for_each_entry_safe(entry, next,
2200 &priv->lec_arp_tables[i], next) {
2201 if (vcc == entry->vcc) {
2202 lec_arp_remove(priv, entry);
2203 lec_arp_put(entry);
2204 if (priv->mcast_vcc == vcc)
2205 priv->mcast_vcc = NULL;
2206 }
2207 }
2208 }
2209
2210 hlist_for_each_entry_safe(entry, next,
2211 &priv->lec_arp_empty_ones, next) {
2212 if (entry->vcc == vcc) {
2213 lec_arp_clear_vccs(entry);
2214 del_timer(&entry->timer);
2215 hlist_del(&entry->next);
2216 lec_arp_put(entry);
2217 }
2218 }
2219
2220 hlist_for_each_entry_safe(entry, next,
2221 &priv->lec_no_forward, next) {
2222 if (entry->recv_vcc == vcc) {
2223 lec_arp_clear_vccs(entry);
2224 del_timer(&entry->timer);
2225 hlist_del(&entry->next);
2226 lec_arp_put(entry);
2227 }
2228 }
2229
2230 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2231 if (entry->recv_vcc == vcc) {
2232 lec_arp_clear_vccs(entry);
2233 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2234 hlist_del(&entry->next);
2235 lec_arp_put(entry);
2236 }
2237 }
2238
2239 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2240 dump_arp_table(priv);
2241 }
2242
2243 static void
2244 lec_arp_check_empties(struct lec_priv *priv,
2245 struct atm_vcc *vcc, struct sk_buff *skb)
2246 {
2247 unsigned long flags;
2248 struct hlist_node *next;
2249 struct lec_arp_table *entry, *tmp;
2250 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2251 unsigned char *src = hdr->h_source;
2252
2253 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2254 hlist_for_each_entry_safe(entry, next,
2255 &priv->lec_arp_empty_ones, next) {
2256 if (vcc == entry->vcc) {
2257 del_timer(&entry->timer);
2258 ether_addr_copy(entry->mac_addr, src);
2259 entry->status = ESI_FORWARD_DIRECT;
2260 entry->last_used = jiffies;
2261 /* We might have got an entry */
2262 tmp = lec_arp_find(priv, src);
2263 if (tmp) {
2264 lec_arp_remove(priv, tmp);
2265 lec_arp_put(tmp);
2266 }
2267 hlist_del(&entry->next);
2268 lec_arp_add(priv, entry);
2269 goto out;
2270 }
2271 }
2272 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2273 out:
2274 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2275 }
2276
2277 MODULE_LICENSE("GPL");
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