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Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6
[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 /* TokenRing if needed */
30 #ifdef CONFIG_TR
31 #include <linux/trdevice.h>
32 #endif
33
34 /* And atm device */
35 #include <linux/atmdev.h>
36 #include <linux/atmlec.h>
37
38 /* Proxy LEC knows about bridging */
39 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
40 #include "../bridge/br_private.h"
41
42 static unsigned char bridge_ula_lec[] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
43 #endif
44
45 /* Modular too */
46 #include <linux/module.h>
47 #include <linux/init.h>
48
49 #include "lec.h"
50 #include "lec_arpc.h"
51 #include "resources.h"
52
53 #define DUMP_PACKETS 0 /*
54 * 0 = None,
55 * 1 = 30 first bytes
56 * 2 = Whole packet
57 */
58
59 #define LEC_UNRES_QUE_LEN 8 /*
60 * number of tx packets to queue for a
61 * single destination while waiting for SVC
62 */
63
64 static int lec_open(struct net_device *dev);
65 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
66 struct net_device *dev);
67 static int lec_close(struct net_device *dev);
68 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
69 const unsigned char *mac_addr);
70 static int lec_arp_remove(struct lec_priv *priv,
71 struct lec_arp_table *to_remove);
72 /* LANE2 functions */
73 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_address,
74 const u8 *tlvs, u32 sizeoftlvs);
75 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
76 u8 **tlvs, u32 *sizeoftlvs);
77 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
78 const u8 *tlvs, u32 sizeoftlvs);
79
80 static int lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
81 unsigned long permanent);
82 static void lec_arp_check_empties(struct lec_priv *priv,
83 struct atm_vcc *vcc, struct sk_buff *skb);
84 static void lec_arp_destroy(struct lec_priv *priv);
85 static void lec_arp_init(struct lec_priv *priv);
86 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
87 const unsigned char *mac_to_find,
88 int is_rdesc,
89 struct lec_arp_table **ret_entry);
90 static void lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
91 const unsigned char *atm_addr,
92 unsigned long remoteflag,
93 unsigned int targetless_le_arp);
94 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id);
95 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc);
96 static void lec_set_flush_tran_id(struct lec_priv *priv,
97 const unsigned char *atm_addr,
98 unsigned long tran_id);
99 static void lec_vcc_added(struct lec_priv *priv,
100 const struct atmlec_ioc *ioc_data,
101 struct atm_vcc *vcc,
102 void (*old_push)(struct atm_vcc *vcc,
103 struct sk_buff *skb));
104 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
105
106 /* must be done under lec_arp_lock */
107 static inline void lec_arp_hold(struct lec_arp_table *entry)
108 {
109 atomic_inc(&entry->usage);
110 }
111
112 static inline void lec_arp_put(struct lec_arp_table *entry)
113 {
114 if (atomic_dec_and_test(&entry->usage))
115 kfree(entry);
116 }
117
118 static struct lane2_ops lane2_ops = {
119 lane2_resolve, /* resolve, spec 3.1.3 */
120 lane2_associate_req, /* associate_req, spec 3.1.4 */
121 NULL /* associate indicator, spec 3.1.5 */
122 };
123
124 static unsigned char bus_mac[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
125
126 /* Device structures */
127 static struct net_device *dev_lec[MAX_LEC_ITF];
128
129 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
130 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
131 {
132 struct ethhdr *eth;
133 char *buff;
134 struct lec_priv *priv;
135
136 /*
137 * Check if this is a BPDU. If so, ask zeppelin to send
138 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
139 * as the Config BPDU has
140 */
141 eth = (struct ethhdr *)skb->data;
142 buff = skb->data + skb->dev->hard_header_len;
143 if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
144 struct sock *sk;
145 struct sk_buff *skb2;
146 struct atmlec_msg *mesg;
147
148 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
149 if (skb2 == NULL)
150 return;
151 skb2->len = sizeof(struct atmlec_msg);
152 mesg = (struct atmlec_msg *)skb2->data;
153 mesg->type = l_topology_change;
154 buff += 4;
155 mesg->content.normal.flag = *buff & 0x01;
156 /* 0x01 is topology change */
157
158 priv = netdev_priv(dev);
159 atm_force_charge(priv->lecd, skb2->truesize);
160 sk = sk_atm(priv->lecd);
161 skb_queue_tail(&sk->sk_receive_queue, skb2);
162 sk->sk_data_ready(sk, skb2->len);
163 }
164
165 return;
166 }
167 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
168
169 /*
170 * Modelled after tr_type_trans
171 * All multicast and ARE or STE frames go to BUS.
172 * Non source routed frames go by destination address.
173 * Last hop source routed frames go by destination address.
174 * Not last hop source routed frames go by _next_ route descriptor.
175 * Returns pointer to destination MAC address or fills in rdesc
176 * and returns NULL.
177 */
178 #ifdef CONFIG_TR
179 static unsigned char *get_tr_dst(unsigned char *packet, unsigned char *rdesc)
180 {
181 struct trh_hdr *trh;
182 unsigned int riflen, num_rdsc;
183
184 trh = (struct trh_hdr *)packet;
185 if (trh->daddr[0] & (uint8_t) 0x80)
186 return bus_mac; /* multicast */
187
188 if (trh->saddr[0] & TR_RII) {
189 riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
190 if ((ntohs(trh->rcf) >> 13) != 0)
191 return bus_mac; /* ARE or STE */
192 } else
193 return trh->daddr; /* not source routed */
194
195 if (riflen < 6)
196 return trh->daddr; /* last hop, source routed */
197
198 /* riflen is 6 or more, packet has more than one route descriptor */
199 num_rdsc = (riflen / 2) - 1;
200 memset(rdesc, 0, ETH_ALEN);
201 /* offset 4 comes from LAN destination field in LE control frames */
202 if (trh->rcf & htons((uint16_t) TR_RCF_DIR_BIT))
203 memcpy(&rdesc[4], &trh->rseg[num_rdsc - 2], sizeof(__be16));
204 else {
205 memcpy(&rdesc[4], &trh->rseg[1], sizeof(__be16));
206 rdesc[5] = ((ntohs(trh->rseg[0]) & 0x000f) | (rdesc[5] & 0xf0));
207 }
208
209 return NULL;
210 }
211 #endif /* CONFIG_TR */
212
213 /*
214 * Open/initialize the netdevice. This is called (in the current kernel)
215 * sometime after booting when the 'ifconfig' program is run.
216 *
217 * This routine should set everything up anew at each open, even
218 * registers that "should" only need to be set once at boot, so that
219 * there is non-reboot way to recover if something goes wrong.
220 */
221
222 static int lec_open(struct net_device *dev)
223 {
224 netif_start_queue(dev);
225 memset(&dev->stats, 0, sizeof(struct net_device_stats));
226
227 return 0;
228 }
229
230 static void
231 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
232 {
233 struct net_device *dev = skb->dev;
234
235 ATM_SKB(skb)->vcc = vcc;
236 ATM_SKB(skb)->atm_options = vcc->atm_options;
237
238 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
239 if (vcc->send(vcc, skb) < 0) {
240 dev->stats.tx_dropped++;
241 return;
242 }
243
244 dev->stats.tx_packets++;
245 dev->stats.tx_bytes += skb->len;
246 }
247
248 static void lec_tx_timeout(struct net_device *dev)
249 {
250 pr_info("%s\n", dev->name);
251 dev->trans_start = jiffies;
252 netif_wake_queue(dev);
253 }
254
255 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
256 struct net_device *dev)
257 {
258 struct sk_buff *skb2;
259 struct lec_priv *priv = netdev_priv(dev);
260 struct lecdatahdr_8023 *lec_h;
261 struct atm_vcc *vcc;
262 struct lec_arp_table *entry;
263 unsigned char *dst;
264 int min_frame_size;
265 #ifdef CONFIG_TR
266 unsigned char rdesc[ETH_ALEN]; /* Token Ring route descriptor */
267 #endif
268 int is_rdesc;
269
270 pr_debug("called\n");
271 if (!priv->lecd) {
272 pr_info("%s:No lecd attached\n", dev->name);
273 dev->stats.tx_errors++;
274 netif_stop_queue(dev);
275 kfree_skb(skb);
276 return NETDEV_TX_OK;
277 }
278
279 pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
280 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
281 (long)skb_end_pointer(skb));
282 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
283 if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
284 lec_handle_bridge(skb, dev);
285 #endif
286
287 /* Make sure we have room for lec_id */
288 if (skb_headroom(skb) < 2) {
289 pr_debug("reallocating skb\n");
290 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
291 kfree_skb(skb);
292 if (skb2 == NULL)
293 return NETDEV_TX_OK;
294 skb = skb2;
295 }
296 skb_push(skb, 2);
297
298 /* Put le header to place, works for TokenRing too */
299 lec_h = (struct lecdatahdr_8023 *)skb->data;
300 lec_h->le_header = htons(priv->lecid);
301
302 #ifdef CONFIG_TR
303 /*
304 * Ugly. Use this to realign Token Ring packets for
305 * e.g. PCA-200E driver.
306 */
307 if (priv->is_trdev) {
308 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
309 kfree_skb(skb);
310 if (skb2 == NULL)
311 return NETDEV_TX_OK;
312 skb = skb2;
313 }
314 #endif
315
316 #if DUMP_PACKETS >= 2
317 #define MAX_DUMP_SKB 99
318 #elif DUMP_PACKETS >= 1
319 #define MAX_DUMP_SKB 30
320 #endif
321 #if DUMP_PACKETS >= 1
322 printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
323 dev->name, skb->len, priv->lecid);
324 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
325 skb->data, min(skb->len, MAX_DUMP_SKB), true);
326 #endif /* DUMP_PACKETS >= 1 */
327
328 /* Minimum ethernet-frame size */
329 #ifdef CONFIG_TR
330 if (priv->is_trdev)
331 min_frame_size = LEC_MINIMUM_8025_SIZE;
332 else
333 #endif
334 min_frame_size = LEC_MINIMUM_8023_SIZE;
335 if (skb->len < min_frame_size) {
336 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
337 skb2 = skb_copy_expand(skb, 0,
338 min_frame_size - skb->truesize,
339 GFP_ATOMIC);
340 dev_kfree_skb(skb);
341 if (skb2 == NULL) {
342 dev->stats.tx_dropped++;
343 return NETDEV_TX_OK;
344 }
345 skb = skb2;
346 }
347 skb_put(skb, min_frame_size - skb->len);
348 }
349
350 /* Send to right vcc */
351 is_rdesc = 0;
352 dst = lec_h->h_dest;
353 #ifdef CONFIG_TR
354 if (priv->is_trdev) {
355 dst = get_tr_dst(skb->data + 2, rdesc);
356 if (dst == NULL) {
357 dst = rdesc;
358 is_rdesc = 1;
359 }
360 }
361 #endif
362 entry = NULL;
363 vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
364 pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
365 dev->name, vcc, vcc ? vcc->flags : 0, entry);
366 if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
367 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
368 pr_debug("%s:queuing packet, MAC address %pM\n",
369 dev->name, lec_h->h_dest);
370 skb_queue_tail(&entry->tx_wait, skb);
371 } else {
372 pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
373 dev->name, lec_h->h_dest);
374 dev->stats.tx_dropped++;
375 dev_kfree_skb(skb);
376 }
377 goto out;
378 }
379 #if DUMP_PACKETS > 0
380 printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
381 dev->name, vcc->vpi, vcc->vci);
382 #endif /* DUMP_PACKETS > 0 */
383
384 while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
385 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
386 lec_send(vcc, skb2);
387 }
388
389 lec_send(vcc, skb);
390
391 if (!atm_may_send(vcc, 0)) {
392 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
393
394 vpriv->xoff = 1;
395 netif_stop_queue(dev);
396
397 /*
398 * vcc->pop() might have occurred in between, making
399 * the vcc usuable again. Since xmit is serialized,
400 * this is the only situation we have to re-test.
401 */
402
403 if (atm_may_send(vcc, 0))
404 netif_wake_queue(dev);
405 }
406
407 out:
408 if (entry)
409 lec_arp_put(entry);
410 dev->trans_start = jiffies;
411 return NETDEV_TX_OK;
412 }
413
414 /* The inverse routine to net_open(). */
415 static int lec_close(struct net_device *dev)
416 {
417 netif_stop_queue(dev);
418 return 0;
419 }
420
421 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
422 {
423 unsigned long flags;
424 struct net_device *dev = (struct net_device *)vcc->proto_data;
425 struct lec_priv *priv = netdev_priv(dev);
426 struct atmlec_msg *mesg;
427 struct lec_arp_table *entry;
428 int i;
429 char *tmp; /* FIXME */
430
431 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
432 mesg = (struct atmlec_msg *)skb->data;
433 tmp = skb->data;
434 tmp += sizeof(struct atmlec_msg);
435 pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
436 switch (mesg->type) {
437 case l_set_mac_addr:
438 for (i = 0; i < 6; i++)
439 dev->dev_addr[i] = mesg->content.normal.mac_addr[i];
440 break;
441 case l_del_mac_addr:
442 for (i = 0; i < 6; i++)
443 dev->dev_addr[i] = 0;
444 break;
445 case l_addr_delete:
446 lec_addr_delete(priv, mesg->content.normal.atm_addr,
447 mesg->content.normal.flag);
448 break;
449 case l_topology_change:
450 priv->topology_change = mesg->content.normal.flag;
451 break;
452 case l_flush_complete:
453 lec_flush_complete(priv, mesg->content.normal.flag);
454 break;
455 case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */
456 spin_lock_irqsave(&priv->lec_arp_lock, flags);
457 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
458 lec_arp_remove(priv, entry);
459 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
460
461 if (mesg->content.normal.no_source_le_narp)
462 break;
463 /* FALL THROUGH */
464 case l_arp_update:
465 lec_arp_update(priv, mesg->content.normal.mac_addr,
466 mesg->content.normal.atm_addr,
467 mesg->content.normal.flag,
468 mesg->content.normal.targetless_le_arp);
469 pr_debug("in l_arp_update\n");
470 if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */
471 pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
472 mesg->sizeoftlvs);
473 lane2_associate_ind(dev, mesg->content.normal.mac_addr,
474 tmp, mesg->sizeoftlvs);
475 }
476 break;
477 case l_config:
478 priv->maximum_unknown_frame_count =
479 mesg->content.config.maximum_unknown_frame_count;
480 priv->max_unknown_frame_time =
481 (mesg->content.config.max_unknown_frame_time * HZ);
482 priv->max_retry_count = mesg->content.config.max_retry_count;
483 priv->aging_time = (mesg->content.config.aging_time * HZ);
484 priv->forward_delay_time =
485 (mesg->content.config.forward_delay_time * HZ);
486 priv->arp_response_time =
487 (mesg->content.config.arp_response_time * HZ);
488 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
489 priv->path_switching_delay =
490 (mesg->content.config.path_switching_delay * HZ);
491 priv->lane_version = mesg->content.config.lane_version;
492 /* LANE2 */
493 priv->lane2_ops = NULL;
494 if (priv->lane_version > 1)
495 priv->lane2_ops = &lane2_ops;
496 if (dev_set_mtu(dev, mesg->content.config.mtu))
497 pr_info("%s: change_mtu to %d failed\n",
498 dev->name, mesg->content.config.mtu);
499 priv->is_proxy = mesg->content.config.is_proxy;
500 break;
501 case l_flush_tran_id:
502 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
503 mesg->content.normal.flag);
504 break;
505 case l_set_lecid:
506 priv->lecid =
507 (unsigned short)(0xffff & mesg->content.normal.flag);
508 break;
509 case l_should_bridge:
510 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
511 {
512 pr_debug("%s: bridge zeppelin asks about %pM\n",
513 dev->name, mesg->content.proxy.mac_addr);
514
515 if (br_fdb_test_addr_hook == NULL)
516 break;
517
518 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
519 /* hit from bridge table, send LE_ARP_RESPONSE */
520 struct sk_buff *skb2;
521 struct sock *sk;
522
523 pr_debug("%s: entry found, responding to zeppelin\n",
524 dev->name);
525 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
526 if (skb2 == NULL)
527 break;
528 skb2->len = sizeof(struct atmlec_msg);
529 skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
530 atm_force_charge(priv->lecd, skb2->truesize);
531 sk = sk_atm(priv->lecd);
532 skb_queue_tail(&sk->sk_receive_queue, skb2);
533 sk->sk_data_ready(sk, skb2->len);
534 }
535 }
536 #endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
537 break;
538 default:
539 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
540 dev_kfree_skb(skb);
541 return -EINVAL;
542 }
543 dev_kfree_skb(skb);
544 return 0;
545 }
546
547 static void lec_atm_close(struct atm_vcc *vcc)
548 {
549 struct sk_buff *skb;
550 struct net_device *dev = (struct net_device *)vcc->proto_data;
551 struct lec_priv *priv = netdev_priv(dev);
552
553 priv->lecd = NULL;
554 /* Do something needful? */
555
556 netif_stop_queue(dev);
557 lec_arp_destroy(priv);
558
559 if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
560 pr_info("%s closing with messages pending\n", dev->name);
561 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
562 atm_return(vcc, skb->truesize);
563 dev_kfree_skb(skb);
564 }
565
566 pr_info("%s: Shut down!\n", dev->name);
567 module_put(THIS_MODULE);
568 }
569
570 static struct atmdev_ops lecdev_ops = {
571 .close = lec_atm_close,
572 .send = lec_atm_send
573 };
574
575 static struct atm_dev lecatm_dev = {
576 .ops = &lecdev_ops,
577 .type = "lec",
578 .number = 999, /* dummy device number */
579 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
580 };
581
582 /*
583 * LANE2: new argument struct sk_buff *data contains
584 * the LE_ARP based TLVs introduced in the LANE2 spec
585 */
586 static int
587 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
588 const unsigned char *mac_addr, const unsigned char *atm_addr,
589 struct sk_buff *data)
590 {
591 struct sock *sk;
592 struct sk_buff *skb;
593 struct atmlec_msg *mesg;
594
595 if (!priv || !priv->lecd)
596 return -1;
597 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
598 if (!skb)
599 return -1;
600 skb->len = sizeof(struct atmlec_msg);
601 mesg = (struct atmlec_msg *)skb->data;
602 memset(mesg, 0, sizeof(struct atmlec_msg));
603 mesg->type = type;
604 if (data != NULL)
605 mesg->sizeoftlvs = data->len;
606 if (mac_addr)
607 memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
608 else
609 mesg->content.normal.targetless_le_arp = 1;
610 if (atm_addr)
611 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
612
613 atm_force_charge(priv->lecd, skb->truesize);
614 sk = sk_atm(priv->lecd);
615 skb_queue_tail(&sk->sk_receive_queue, skb);
616 sk->sk_data_ready(sk, skb->len);
617
618 if (data != NULL) {
619 pr_debug("about to send %d bytes of data\n", data->len);
620 atm_force_charge(priv->lecd, data->truesize);
621 skb_queue_tail(&sk->sk_receive_queue, data);
622 sk->sk_data_ready(sk, skb->len);
623 }
624
625 return 0;
626 }
627
628 /* shamelessly stolen from drivers/net/net_init.c */
629 static int lec_change_mtu(struct net_device *dev, int new_mtu)
630 {
631 if ((new_mtu < 68) || (new_mtu > 18190))
632 return -EINVAL;
633 dev->mtu = new_mtu;
634 return 0;
635 }
636
637 static void lec_set_multicast_list(struct net_device *dev)
638 {
639 /*
640 * by default, all multicast frames arrive over the bus.
641 * eventually support selective multicast service
642 */
643 return;
644 }
645
646 static const struct net_device_ops lec_netdev_ops = {
647 .ndo_open = lec_open,
648 .ndo_stop = lec_close,
649 .ndo_start_xmit = lec_start_xmit,
650 .ndo_change_mtu = lec_change_mtu,
651 .ndo_tx_timeout = lec_tx_timeout,
652 .ndo_set_multicast_list = lec_set_multicast_list,
653 };
654
655 static const unsigned char lec_ctrl_magic[] = {
656 0xff,
657 0x00,
658 0x01,
659 0x01
660 };
661
662 #define LEC_DATA_DIRECT_8023 2
663 #define LEC_DATA_DIRECT_8025 3
664
665 static int lec_is_data_direct(struct atm_vcc *vcc)
666 {
667 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
668 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
669 }
670
671 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
672 {
673 unsigned long flags;
674 struct net_device *dev = (struct net_device *)vcc->proto_data;
675 struct lec_priv *priv = netdev_priv(dev);
676
677 #if DUMP_PACKETS > 0
678 printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
679 dev->name, vcc->vpi, vcc->vci);
680 #endif
681 if (!skb) {
682 pr_debug("%s: null skb\n", dev->name);
683 lec_vcc_close(priv, vcc);
684 return;
685 }
686 #if DUMP_PACKETS >= 2
687 #define MAX_SKB_DUMP 99
688 #elif DUMP_PACKETS >= 1
689 #define MAX_SKB_DUMP 30
690 #endif
691 #if DUMP_PACKETS > 0
692 printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
693 dev->name, skb->len, priv->lecid);
694 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
695 skb->data, min(MAX_SKB_DUMP, skb->len), true);
696 #endif /* DUMP_PACKETS > 0 */
697 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
698 /* Control frame, to daemon */
699 struct sock *sk = sk_atm(vcc);
700
701 pr_debug("%s: To daemon\n", dev->name);
702 skb_queue_tail(&sk->sk_receive_queue, skb);
703 sk->sk_data_ready(sk, skb->len);
704 } else { /* Data frame, queue to protocol handlers */
705 struct lec_arp_table *entry;
706 unsigned char *src, *dst;
707
708 atm_return(vcc, skb->truesize);
709 if (*(__be16 *) skb->data == htons(priv->lecid) ||
710 !priv->lecd || !(dev->flags & IFF_UP)) {
711 /*
712 * Probably looping back, or if lecd is missing,
713 * lecd has gone down
714 */
715 pr_debug("Ignoring frame...\n");
716 dev_kfree_skb(skb);
717 return;
718 }
719 #ifdef CONFIG_TR
720 if (priv->is_trdev)
721 dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
722 else
723 #endif
724 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
725
726 /*
727 * If this is a Data Direct VCC, and the VCC does not match
728 * the LE_ARP cache entry, delete the LE_ARP cache entry.
729 */
730 spin_lock_irqsave(&priv->lec_arp_lock, flags);
731 if (lec_is_data_direct(vcc)) {
732 #ifdef CONFIG_TR
733 if (priv->is_trdev)
734 src =
735 ((struct lecdatahdr_8025 *)skb->data)->
736 h_source;
737 else
738 #endif
739 src =
740 ((struct lecdatahdr_8023 *)skb->data)->
741 h_source;
742 entry = lec_arp_find(priv, src);
743 if (entry && entry->vcc != vcc) {
744 lec_arp_remove(priv, entry);
745 lec_arp_put(entry);
746 }
747 }
748 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
749
750 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
751 !priv->is_proxy && /* Proxy wants all the packets */
752 memcmp(dst, dev->dev_addr, dev->addr_len)) {
753 dev_kfree_skb(skb);
754 return;
755 }
756 if (!hlist_empty(&priv->lec_arp_empty_ones))
757 lec_arp_check_empties(priv, vcc, skb);
758 skb_pull(skb, 2); /* skip lec_id */
759 #ifdef CONFIG_TR
760 if (priv->is_trdev)
761 skb->protocol = tr_type_trans(skb, dev);
762 else
763 #endif
764 skb->protocol = eth_type_trans(skb, dev);
765 dev->stats.rx_packets++;
766 dev->stats.rx_bytes += skb->len;
767 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
768 netif_rx(skb);
769 }
770 }
771
772 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
773 {
774 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
775 struct net_device *dev = skb->dev;
776
777 if (vpriv == NULL) {
778 pr_info("vpriv = NULL!?!?!?\n");
779 return;
780 }
781
782 vpriv->old_pop(vcc, skb);
783
784 if (vpriv->xoff && atm_may_send(vcc, 0)) {
785 vpriv->xoff = 0;
786 if (netif_running(dev) && netif_queue_stopped(dev))
787 netif_wake_queue(dev);
788 }
789 }
790
791 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
792 {
793 struct lec_vcc_priv *vpriv;
794 int bytes_left;
795 struct atmlec_ioc ioc_data;
796
797 /* Lecd must be up in this case */
798 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
799 if (bytes_left != 0)
800 pr_info("copy from user failed for %d bytes\n", bytes_left);
801 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
802 !dev_lec[ioc_data.dev_num])
803 return -EINVAL;
804 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
805 if (!vpriv)
806 return -ENOMEM;
807 vpriv->xoff = 0;
808 vpriv->old_pop = vcc->pop;
809 vcc->user_back = vpriv;
810 vcc->pop = lec_pop;
811 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
812 &ioc_data, vcc, vcc->push);
813 vcc->proto_data = dev_lec[ioc_data.dev_num];
814 vcc->push = lec_push;
815 return 0;
816 }
817
818 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
819 {
820 if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
821 return -EINVAL;
822 vcc->proto_data = dev_lec[arg];
823 return lec_mcast_make((struct lec_priv *)netdev_priv(dev_lec[arg]),
824 vcc);
825 }
826
827 /* Initialize device. */
828 static int lecd_attach(struct atm_vcc *vcc, int arg)
829 {
830 int i;
831 struct lec_priv *priv;
832
833 if (arg < 0)
834 i = 0;
835 else
836 i = arg;
837 #ifdef CONFIG_TR
838 if (arg >= MAX_LEC_ITF)
839 return -EINVAL;
840 #else /* Reserve the top NUM_TR_DEVS for TR */
841 if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
842 return -EINVAL;
843 #endif
844 if (!dev_lec[i]) {
845 int is_trdev, size;
846
847 is_trdev = 0;
848 if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
849 is_trdev = 1;
850
851 size = sizeof(struct lec_priv);
852 #ifdef CONFIG_TR
853 if (is_trdev)
854 dev_lec[i] = alloc_trdev(size);
855 else
856 #endif
857 dev_lec[i] = alloc_etherdev(size);
858 if (!dev_lec[i])
859 return -ENOMEM;
860 dev_lec[i]->netdev_ops = &lec_netdev_ops;
861 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
862 if (register_netdev(dev_lec[i])) {
863 free_netdev(dev_lec[i]);
864 return -EINVAL;
865 }
866
867 priv = netdev_priv(dev_lec[i]);
868 priv->is_trdev = is_trdev;
869 } else {
870 priv = netdev_priv(dev_lec[i]);
871 if (priv->lecd)
872 return -EADDRINUSE;
873 }
874 lec_arp_init(priv);
875 priv->itfnum = i; /* LANE2 addition */
876 priv->lecd = vcc;
877 vcc->dev = &lecatm_dev;
878 vcc_insert_socket(sk_atm(vcc));
879
880 vcc->proto_data = dev_lec[i];
881 set_bit(ATM_VF_META, &vcc->flags);
882 set_bit(ATM_VF_READY, &vcc->flags);
883
884 /* Set default values to these variables */
885 priv->maximum_unknown_frame_count = 1;
886 priv->max_unknown_frame_time = (1 * HZ);
887 priv->vcc_timeout_period = (1200 * HZ);
888 priv->max_retry_count = 1;
889 priv->aging_time = (300 * HZ);
890 priv->forward_delay_time = (15 * HZ);
891 priv->topology_change = 0;
892 priv->arp_response_time = (1 * HZ);
893 priv->flush_timeout = (4 * HZ);
894 priv->path_switching_delay = (6 * HZ);
895
896 if (dev_lec[i]->flags & IFF_UP)
897 netif_start_queue(dev_lec[i]);
898 __module_get(THIS_MODULE);
899 return i;
900 }
901
902 #ifdef CONFIG_PROC_FS
903 static const char *lec_arp_get_status_string(unsigned char status)
904 {
905 static const char *const lec_arp_status_string[] = {
906 "ESI_UNKNOWN ",
907 "ESI_ARP_PENDING ",
908 "ESI_VC_PENDING ",
909 "<Undefined> ",
910 "ESI_FLUSH_PENDING ",
911 "ESI_FORWARD_DIRECT"
912 };
913
914 if (status > ESI_FORWARD_DIRECT)
915 status = 3; /* ESI_UNDEFINED */
916 return lec_arp_status_string[status];
917 }
918
919 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
920 {
921 int i;
922
923 for (i = 0; i < ETH_ALEN; i++)
924 seq_printf(seq, "%2.2x", entry->mac_addr[i] & 0xff);
925 seq_printf(seq, " ");
926 for (i = 0; i < ATM_ESA_LEN; i++)
927 seq_printf(seq, "%2.2x", entry->atm_addr[i] & 0xff);
928 seq_printf(seq, " %s %4.4x", lec_arp_get_status_string(entry->status),
929 entry->flags & 0xffff);
930 if (entry->vcc)
931 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
932 else
933 seq_printf(seq, " ");
934 if (entry->recv_vcc) {
935 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi,
936 entry->recv_vcc->vci);
937 }
938 seq_putc(seq, '\n');
939 }
940
941 struct lec_state {
942 unsigned long flags;
943 struct lec_priv *locked;
944 struct hlist_node *node;
945 struct net_device *dev;
946 int itf;
947 int arp_table;
948 int misc_table;
949 };
950
951 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
952 loff_t *l)
953 {
954 struct hlist_node *e = state->node;
955 struct lec_arp_table *tmp;
956
957 if (!e)
958 e = tbl->first;
959 if (e == SEQ_START_TOKEN) {
960 e = tbl->first;
961 --*l;
962 }
963
964 hlist_for_each_entry_from(tmp, e, next) {
965 if (--*l < 0)
966 break;
967 }
968 state->node = e;
969
970 return (*l < 0) ? state : NULL;
971 }
972
973 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
974 struct lec_priv *priv)
975 {
976 void *v = NULL;
977 int p;
978
979 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
980 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
981 if (v)
982 break;
983 }
984 state->arp_table = p;
985 return v;
986 }
987
988 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
989 struct lec_priv *priv)
990 {
991 struct hlist_head *lec_misc_tables[] = {
992 &priv->lec_arp_empty_ones,
993 &priv->lec_no_forward,
994 &priv->mcast_fwds
995 };
996 void *v = NULL;
997 int q;
998
999 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
1000 v = lec_tbl_walk(state, lec_misc_tables[q], l);
1001 if (v)
1002 break;
1003 }
1004 state->misc_table = q;
1005 return v;
1006 }
1007
1008 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
1009 struct lec_priv *priv)
1010 {
1011 if (!state->locked) {
1012 state->locked = priv;
1013 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
1014 }
1015 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
1016 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
1017 state->locked = NULL;
1018 /* Partial state reset for the next time we get called */
1019 state->arp_table = state->misc_table = 0;
1020 }
1021 return state->locked;
1022 }
1023
1024 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
1025 {
1026 struct net_device *dev;
1027 void *v;
1028
1029 dev = state->dev ? state->dev : dev_lec[state->itf];
1030 v = (dev && netdev_priv(dev)) ?
1031 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
1032 if (!v && dev) {
1033 dev_put(dev);
1034 /* Partial state reset for the next time we get called */
1035 dev = NULL;
1036 }
1037 state->dev = dev;
1038 return v;
1039 }
1040
1041 static void *lec_get_idx(struct lec_state *state, loff_t l)
1042 {
1043 void *v = NULL;
1044
1045 for (; state->itf < MAX_LEC_ITF; state->itf++) {
1046 v = lec_itf_walk(state, &l);
1047 if (v)
1048 break;
1049 }
1050 return v;
1051 }
1052
1053 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
1054 {
1055 struct lec_state *state = seq->private;
1056
1057 state->itf = 0;
1058 state->dev = NULL;
1059 state->locked = NULL;
1060 state->arp_table = 0;
1061 state->misc_table = 0;
1062 state->node = SEQ_START_TOKEN;
1063
1064 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
1065 }
1066
1067 static void lec_seq_stop(struct seq_file *seq, void *v)
1068 {
1069 struct lec_state *state = seq->private;
1070
1071 if (state->dev) {
1072 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
1073 state->flags);
1074 dev_put(state->dev);
1075 }
1076 }
1077
1078 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1079 {
1080 struct lec_state *state = seq->private;
1081
1082 v = lec_get_idx(state, 1);
1083 *pos += !!PTR_ERR(v);
1084 return v;
1085 }
1086
1087 static int lec_seq_show(struct seq_file *seq, void *v)
1088 {
1089 static const char lec_banner[] =
1090 "Itf MAC ATM destination"
1091 " Status Flags "
1092 "VPI/VCI Recv VPI/VCI\n";
1093
1094 if (v == SEQ_START_TOKEN)
1095 seq_puts(seq, lec_banner);
1096 else {
1097 struct lec_state *state = seq->private;
1098 struct net_device *dev = state->dev;
1099 struct lec_arp_table *entry = hlist_entry(state->node,
1100 struct lec_arp_table,
1101 next);
1102
1103 seq_printf(seq, "%s ", dev->name);
1104 lec_info(seq, entry);
1105 }
1106 return 0;
1107 }
1108
1109 static const struct seq_operations lec_seq_ops = {
1110 .start = lec_seq_start,
1111 .next = lec_seq_next,
1112 .stop = lec_seq_stop,
1113 .show = lec_seq_show,
1114 };
1115
1116 static int lec_seq_open(struct inode *inode, struct file *file)
1117 {
1118 return seq_open_private(file, &lec_seq_ops, sizeof(struct lec_state));
1119 }
1120
1121 static const struct file_operations lec_seq_fops = {
1122 .owner = THIS_MODULE,
1123 .open = lec_seq_open,
1124 .read = seq_read,
1125 .llseek = seq_lseek,
1126 .release = seq_release_private,
1127 };
1128 #endif
1129
1130 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1131 {
1132 struct atm_vcc *vcc = ATM_SD(sock);
1133 int err = 0;
1134
1135 switch (cmd) {
1136 case ATMLEC_CTRL:
1137 case ATMLEC_MCAST:
1138 case ATMLEC_DATA:
1139 if (!capable(CAP_NET_ADMIN))
1140 return -EPERM;
1141 break;
1142 default:
1143 return -ENOIOCTLCMD;
1144 }
1145
1146 switch (cmd) {
1147 case ATMLEC_CTRL:
1148 err = lecd_attach(vcc, (int)arg);
1149 if (err >= 0)
1150 sock->state = SS_CONNECTED;
1151 break;
1152 case ATMLEC_MCAST:
1153 err = lec_mcast_attach(vcc, (int)arg);
1154 break;
1155 case ATMLEC_DATA:
1156 err = lec_vcc_attach(vcc, (void __user *)arg);
1157 break;
1158 }
1159
1160 return err;
1161 }
1162
1163 static struct atm_ioctl lane_ioctl_ops = {
1164 .owner = THIS_MODULE,
1165 .ioctl = lane_ioctl,
1166 };
1167
1168 static int __init lane_module_init(void)
1169 {
1170 #ifdef CONFIG_PROC_FS
1171 struct proc_dir_entry *p;
1172
1173 p = proc_create("lec", S_IRUGO, atm_proc_root, &lec_seq_fops);
1174 if (!p) {
1175 pr_err("Unable to initialize /proc/net/atm/lec\n");
1176 return -ENOMEM;
1177 }
1178 #endif
1179
1180 register_atm_ioctl(&lane_ioctl_ops);
1181 pr_info("lec.c: " __DATE__ " " __TIME__ " initialized\n");
1182 return 0;
1183 }
1184
1185 static void __exit lane_module_cleanup(void)
1186 {
1187 int i;
1188 struct lec_priv *priv;
1189
1190 remove_proc_entry("lec", atm_proc_root);
1191
1192 deregister_atm_ioctl(&lane_ioctl_ops);
1193
1194 for (i = 0; i < MAX_LEC_ITF; i++) {
1195 if (dev_lec[i] != NULL) {
1196 priv = netdev_priv(dev_lec[i]);
1197 unregister_netdev(dev_lec[i]);
1198 free_netdev(dev_lec[i]);
1199 dev_lec[i] = NULL;
1200 }
1201 }
1202
1203 return;
1204 }
1205
1206 module_init(lane_module_init);
1207 module_exit(lane_module_cleanup);
1208
1209 /*
1210 * LANE2: 3.1.3, LE_RESOLVE.request
1211 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1212 * If sizeoftlvs == NULL the default TLVs associated with with this
1213 * lec will be used.
1214 * If dst_mac == NULL, targetless LE_ARP will be sent
1215 */
1216 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1217 u8 **tlvs, u32 *sizeoftlvs)
1218 {
1219 unsigned long flags;
1220 struct lec_priv *priv = netdev_priv(dev);
1221 struct lec_arp_table *table;
1222 struct sk_buff *skb;
1223 int retval;
1224
1225 if (force == 0) {
1226 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1227 table = lec_arp_find(priv, dst_mac);
1228 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1229 if (table == NULL)
1230 return -1;
1231
1232 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1233 if (*tlvs == NULL)
1234 return -1;
1235
1236 *sizeoftlvs = table->sizeoftlvs;
1237
1238 return 0;
1239 }
1240
1241 if (sizeoftlvs == NULL)
1242 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1243
1244 else {
1245 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1246 if (skb == NULL)
1247 return -1;
1248 skb->len = *sizeoftlvs;
1249 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1250 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1251 }
1252 return retval;
1253 }
1254
1255 /*
1256 * LANE2: 3.1.4, LE_ASSOCIATE.request
1257 * Associate the *tlvs with the *lan_dst address.
1258 * Will overwrite any previous association
1259 * Returns 1 for success, 0 for failure (out of memory)
1260 *
1261 */
1262 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1263 const u8 *tlvs, u32 sizeoftlvs)
1264 {
1265 int retval;
1266 struct sk_buff *skb;
1267 struct lec_priv *priv = netdev_priv(dev);
1268
1269 if (compare_ether_addr(lan_dst, dev->dev_addr))
1270 return 0; /* not our mac address */
1271
1272 kfree(priv->tlvs); /* NULL if there was no previous association */
1273
1274 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1275 if (priv->tlvs == NULL)
1276 return 0;
1277 priv->sizeoftlvs = sizeoftlvs;
1278
1279 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1280 if (skb == NULL)
1281 return 0;
1282 skb->len = sizeoftlvs;
1283 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1284 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1285 if (retval != 0)
1286 pr_info("lec.c: lane2_associate_req() failed\n");
1287 /*
1288 * If the previous association has changed we must
1289 * somehow notify other LANE entities about the change
1290 */
1291 return 1;
1292 }
1293
1294 /*
1295 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1296 *
1297 */
1298 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1299 const u8 *tlvs, u32 sizeoftlvs)
1300 {
1301 #if 0
1302 int i = 0;
1303 #endif
1304 struct lec_priv *priv = netdev_priv(dev);
1305 #if 0 /*
1306 * Why have the TLVs in LE_ARP entries
1307 * since we do not use them? When you
1308 * uncomment this code, make sure the
1309 * TLVs get freed when entry is killed
1310 */
1311 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1312
1313 if (entry == NULL)
1314 return; /* should not happen */
1315
1316 kfree(entry->tlvs);
1317
1318 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1319 if (entry->tlvs == NULL)
1320 return;
1321 entry->sizeoftlvs = sizeoftlvs;
1322 #endif
1323 #if 0
1324 pr_info("\n");
1325 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1326 while (i < sizeoftlvs)
1327 pr_cont("%02x ", tlvs[i++]);
1328
1329 pr_cont("\n");
1330 #endif
1331
1332 /* tell MPOA about the TLVs we saw */
1333 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1334 priv->lane2_ops->associate_indicator(dev, mac_addr,
1335 tlvs, sizeoftlvs);
1336 }
1337 return;
1338 }
1339
1340 /*
1341 * Here starts what used to lec_arpc.c
1342 *
1343 * lec_arpc.c was added here when making
1344 * lane client modular. October 1997
1345 */
1346
1347 #include <linux/types.h>
1348 #include <linux/timer.h>
1349 #include <linux/param.h>
1350 #include <asm/atomic.h>
1351 #include <linux/inetdevice.h>
1352 #include <net/route.h>
1353
1354 #if 0
1355 #define pr_debug(format, args...)
1356 /*
1357 #define pr_debug printk
1358 */
1359 #endif
1360 #define DEBUG_ARP_TABLE 0
1361
1362 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1363
1364 static void lec_arp_check_expire(struct work_struct *work);
1365 static void lec_arp_expire_arp(unsigned long data);
1366
1367 /*
1368 * Arp table funcs
1369 */
1370
1371 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1372
1373 /*
1374 * Initialization of arp-cache
1375 */
1376 static void lec_arp_init(struct lec_priv *priv)
1377 {
1378 unsigned short i;
1379
1380 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1381 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1382 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1383 INIT_HLIST_HEAD(&priv->lec_no_forward);
1384 INIT_HLIST_HEAD(&priv->mcast_fwds);
1385 spin_lock_init(&priv->lec_arp_lock);
1386 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1387 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1388 }
1389
1390 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1391 {
1392 if (entry->vcc) {
1393 struct atm_vcc *vcc = entry->vcc;
1394 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1395 struct net_device *dev = (struct net_device *)vcc->proto_data;
1396
1397 vcc->pop = vpriv->old_pop;
1398 if (vpriv->xoff)
1399 netif_wake_queue(dev);
1400 kfree(vpriv);
1401 vcc->user_back = NULL;
1402 vcc->push = entry->old_push;
1403 vcc_release_async(vcc, -EPIPE);
1404 entry->vcc = NULL;
1405 }
1406 if (entry->recv_vcc) {
1407 entry->recv_vcc->push = entry->old_recv_push;
1408 vcc_release_async(entry->recv_vcc, -EPIPE);
1409 entry->recv_vcc = NULL;
1410 }
1411 }
1412
1413 /*
1414 * Insert entry to lec_arp_table
1415 * LANE2: Add to the end of the list to satisfy 8.1.13
1416 */
1417 static inline void
1418 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1419 {
1420 struct hlist_head *tmp;
1421
1422 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1423 hlist_add_head(&entry->next, tmp);
1424
1425 pr_debug("Added entry:%pM\n", entry->mac_addr);
1426 }
1427
1428 /*
1429 * Remove entry from lec_arp_table
1430 */
1431 static int
1432 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1433 {
1434 struct hlist_node *node;
1435 struct lec_arp_table *entry;
1436 int i, remove_vcc = 1;
1437
1438 if (!to_remove)
1439 return -1;
1440
1441 hlist_del(&to_remove->next);
1442 del_timer(&to_remove->timer);
1443
1444 /*
1445 * If this is the only MAC connected to this VCC,
1446 * also tear down the VCC
1447 */
1448 if (to_remove->status >= ESI_FLUSH_PENDING) {
1449 /*
1450 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1451 */
1452 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1453 hlist_for_each_entry(entry, node,
1454 &priv->lec_arp_tables[i], next) {
1455 if (memcmp(to_remove->atm_addr,
1456 entry->atm_addr, ATM_ESA_LEN) == 0) {
1457 remove_vcc = 0;
1458 break;
1459 }
1460 }
1461 }
1462 if (remove_vcc)
1463 lec_arp_clear_vccs(to_remove);
1464 }
1465 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */
1466
1467 pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1468 return 0;
1469 }
1470
1471 #if DEBUG_ARP_TABLE
1472 static const char *get_status_string(unsigned char st)
1473 {
1474 switch (st) {
1475 case ESI_UNKNOWN:
1476 return "ESI_UNKNOWN";
1477 case ESI_ARP_PENDING:
1478 return "ESI_ARP_PENDING";
1479 case ESI_VC_PENDING:
1480 return "ESI_VC_PENDING";
1481 case ESI_FLUSH_PENDING:
1482 return "ESI_FLUSH_PENDING";
1483 case ESI_FORWARD_DIRECT:
1484 return "ESI_FORWARD_DIRECT";
1485 }
1486 return "<UNKNOWN>";
1487 }
1488
1489 static void dump_arp_table(struct lec_priv *priv)
1490 {
1491 struct hlist_node *node;
1492 struct lec_arp_table *rulla;
1493 char buf[256];
1494 int i, j, offset;
1495
1496 pr_info("Dump %p:\n", priv);
1497 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1498 hlist_for_each_entry(rulla, node,
1499 &priv->lec_arp_tables[i], next) {
1500 offset = 0;
1501 offset += sprintf(buf, "%d: %p\n", i, rulla);
1502 offset += sprintf(buf + offset, "Mac: %pM",
1503 rulla->mac_addr);
1504 offset += sprintf(buf + offset, " Atm:");
1505 for (j = 0; j < ATM_ESA_LEN; j++) {
1506 offset += sprintf(buf + offset,
1507 "%2.2x ",
1508 rulla->atm_addr[j] & 0xff);
1509 }
1510 offset += sprintf(buf + offset,
1511 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1512 rulla->vcc ? rulla->vcc->vpi : 0,
1513 rulla->vcc ? rulla->vcc->vci : 0,
1514 rulla->recv_vcc ? rulla->recv_vcc->
1515 vpi : 0,
1516 rulla->recv_vcc ? rulla->recv_vcc->
1517 vci : 0, rulla->last_used,
1518 rulla->timestamp, rulla->no_tries);
1519 offset +=
1520 sprintf(buf + offset,
1521 "Flags:%x, Packets_flooded:%x, Status: %s ",
1522 rulla->flags, rulla->packets_flooded,
1523 get_status_string(rulla->status));
1524 pr_info("%s\n", buf);
1525 }
1526 }
1527
1528 if (!hlist_empty(&priv->lec_no_forward))
1529 pr_info("No forward\n");
1530 hlist_for_each_entry(rulla, node, &priv->lec_no_forward, next) {
1531 offset = 0;
1532 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1533 offset += sprintf(buf + offset, " Atm:");
1534 for (j = 0; j < ATM_ESA_LEN; j++) {
1535 offset += sprintf(buf + offset, "%2.2x ",
1536 rulla->atm_addr[j] & 0xff);
1537 }
1538 offset += sprintf(buf + offset,
1539 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1540 rulla->vcc ? rulla->vcc->vpi : 0,
1541 rulla->vcc ? rulla->vcc->vci : 0,
1542 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1543 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1544 rulla->last_used,
1545 rulla->timestamp, rulla->no_tries);
1546 offset += sprintf(buf + offset,
1547 "Flags:%x, Packets_flooded:%x, Status: %s ",
1548 rulla->flags, rulla->packets_flooded,
1549 get_status_string(rulla->status));
1550 pr_info("%s\n", buf);
1551 }
1552
1553 if (!hlist_empty(&priv->lec_arp_empty_ones))
1554 pr_info("Empty ones\n");
1555 hlist_for_each_entry(rulla, node, &priv->lec_arp_empty_ones, next) {
1556 offset = 0;
1557 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1558 offset += sprintf(buf + offset, " Atm:");
1559 for (j = 0; j < ATM_ESA_LEN; j++) {
1560 offset += sprintf(buf + offset, "%2.2x ",
1561 rulla->atm_addr[j] & 0xff);
1562 }
1563 offset += sprintf(buf + offset,
1564 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1565 rulla->vcc ? rulla->vcc->vpi : 0,
1566 rulla->vcc ? rulla->vcc->vci : 0,
1567 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1568 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1569 rulla->last_used,
1570 rulla->timestamp, rulla->no_tries);
1571 offset += sprintf(buf + offset,
1572 "Flags:%x, Packets_flooded:%x, Status: %s ",
1573 rulla->flags, rulla->packets_flooded,
1574 get_status_string(rulla->status));
1575 pr_info("%s", buf);
1576 }
1577
1578 if (!hlist_empty(&priv->mcast_fwds))
1579 pr_info("Multicast Forward VCCs\n");
1580 hlist_for_each_entry(rulla, node, &priv->mcast_fwds, next) {
1581 offset = 0;
1582 offset += sprintf(buf + offset, "Mac: %pM", rulla->mac_addr);
1583 offset += sprintf(buf + offset, " Atm:");
1584 for (j = 0; j < ATM_ESA_LEN; j++) {
1585 offset += sprintf(buf + offset, "%2.2x ",
1586 rulla->atm_addr[j] & 0xff);
1587 }
1588 offset += sprintf(buf + offset,
1589 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1590 rulla->vcc ? rulla->vcc->vpi : 0,
1591 rulla->vcc ? rulla->vcc->vci : 0,
1592 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1593 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1594 rulla->last_used,
1595 rulla->timestamp, rulla->no_tries);
1596 offset += sprintf(buf + offset,
1597 "Flags:%x, Packets_flooded:%x, Status: %s ",
1598 rulla->flags, rulla->packets_flooded,
1599 get_status_string(rulla->status));
1600 pr_info("%s\n", buf);
1601 }
1602
1603 }
1604 #else
1605 #define dump_arp_table(priv) do { } while (0)
1606 #endif
1607
1608 /*
1609 * Destruction of arp-cache
1610 */
1611 static void lec_arp_destroy(struct lec_priv *priv)
1612 {
1613 unsigned long flags;
1614 struct hlist_node *node, *next;
1615 struct lec_arp_table *entry;
1616 int i;
1617
1618 cancel_rearming_delayed_work(&priv->lec_arp_work);
1619
1620 /*
1621 * Remove all entries
1622 */
1623
1624 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1625 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1626 hlist_for_each_entry_safe(entry, node, next,
1627 &priv->lec_arp_tables[i], next) {
1628 lec_arp_remove(priv, entry);
1629 lec_arp_put(entry);
1630 }
1631 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1632 }
1633
1634 hlist_for_each_entry_safe(entry, node, next,
1635 &priv->lec_arp_empty_ones, next) {
1636 del_timer_sync(&entry->timer);
1637 lec_arp_clear_vccs(entry);
1638 hlist_del(&entry->next);
1639 lec_arp_put(entry);
1640 }
1641 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1642
1643 hlist_for_each_entry_safe(entry, node, next,
1644 &priv->lec_no_forward, next) {
1645 del_timer_sync(&entry->timer);
1646 lec_arp_clear_vccs(entry);
1647 hlist_del(&entry->next);
1648 lec_arp_put(entry);
1649 }
1650 INIT_HLIST_HEAD(&priv->lec_no_forward);
1651
1652 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
1653 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1654 lec_arp_clear_vccs(entry);
1655 hlist_del(&entry->next);
1656 lec_arp_put(entry);
1657 }
1658 INIT_HLIST_HEAD(&priv->mcast_fwds);
1659 priv->mcast_vcc = NULL;
1660 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1661 }
1662
1663 /*
1664 * Find entry by mac_address
1665 */
1666 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1667 const unsigned char *mac_addr)
1668 {
1669 struct hlist_node *node;
1670 struct hlist_head *head;
1671 struct lec_arp_table *entry;
1672
1673 pr_debug("%pM\n", mac_addr);
1674
1675 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1676 hlist_for_each_entry(entry, node, head, next) {
1677 if (!compare_ether_addr(mac_addr, entry->mac_addr))
1678 return entry;
1679 }
1680 return NULL;
1681 }
1682
1683 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1684 const unsigned char *mac_addr)
1685 {
1686 struct lec_arp_table *to_return;
1687
1688 to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1689 if (!to_return) {
1690 pr_info("LEC: Arp entry kmalloc failed\n");
1691 return NULL;
1692 }
1693 memcpy(to_return->mac_addr, mac_addr, ETH_ALEN);
1694 INIT_HLIST_NODE(&to_return->next);
1695 setup_timer(&to_return->timer, lec_arp_expire_arp,
1696 (unsigned long)to_return);
1697 to_return->last_used = jiffies;
1698 to_return->priv = priv;
1699 skb_queue_head_init(&to_return->tx_wait);
1700 atomic_set(&to_return->usage, 1);
1701 return to_return;
1702 }
1703
1704 /* Arp sent timer expired */
1705 static void lec_arp_expire_arp(unsigned long data)
1706 {
1707 struct lec_arp_table *entry;
1708
1709 entry = (struct lec_arp_table *)data;
1710
1711 pr_debug("\n");
1712 if (entry->status == ESI_ARP_PENDING) {
1713 if (entry->no_tries <= entry->priv->max_retry_count) {
1714 if (entry->is_rdesc)
1715 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1716 entry->mac_addr, NULL, NULL);
1717 else
1718 send_to_lecd(entry->priv, l_arp_xmt,
1719 entry->mac_addr, NULL, NULL);
1720 entry->no_tries++;
1721 }
1722 mod_timer(&entry->timer, jiffies + (1 * HZ));
1723 }
1724 }
1725
1726 /* Unknown/unused vcc expire, remove associated entry */
1727 static void lec_arp_expire_vcc(unsigned long data)
1728 {
1729 unsigned long flags;
1730 struct lec_arp_table *to_remove = (struct lec_arp_table *)data;
1731 struct lec_priv *priv = (struct lec_priv *)to_remove->priv;
1732
1733 del_timer(&to_remove->timer);
1734
1735 pr_debug("%p %p: vpi:%d vci:%d\n",
1736 to_remove, priv,
1737 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1738 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1739
1740 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1741 hlist_del(&to_remove->next);
1742 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1743
1744 lec_arp_clear_vccs(to_remove);
1745 lec_arp_put(to_remove);
1746 }
1747
1748 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1749 unsigned long now,
1750 struct lec_priv *priv)
1751 {
1752 unsigned long time_to_check;
1753
1754 if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1755 time_to_check = priv->forward_delay_time;
1756 else
1757 time_to_check = priv->aging_time;
1758
1759 pr_debug("About to expire: %lx - %lx > %lx\n",
1760 now, entry->last_used, time_to_check);
1761 if (time_after(now, entry->last_used + time_to_check) &&
1762 !(entry->flags & LEC_PERMANENT_FLAG) &&
1763 !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */
1764 /* Remove entry */
1765 pr_debug("Entry timed out\n");
1766 lec_arp_remove(priv, entry);
1767 lec_arp_put(entry);
1768 } else {
1769 /* Something else */
1770 if ((entry->status == ESI_VC_PENDING ||
1771 entry->status == ESI_ARP_PENDING) &&
1772 time_after_eq(now, entry->timestamp +
1773 priv->max_unknown_frame_time)) {
1774 entry->timestamp = jiffies;
1775 entry->packets_flooded = 0;
1776 if (entry->status == ESI_VC_PENDING)
1777 send_to_lecd(priv, l_svc_setup,
1778 entry->mac_addr,
1779 entry->atm_addr,
1780 NULL);
1781 }
1782 if (entry->status == ESI_FLUSH_PENDING &&
1783 time_after_eq(now, entry->timestamp +
1784 priv->path_switching_delay)) {
1785 lec_arp_hold(entry);
1786 return true;
1787 }
1788 }
1789
1790 return false;
1791 }
1792 /*
1793 * Expire entries.
1794 * 1. Re-set timer
1795 * 2. For each entry, delete entries that have aged past the age limit.
1796 * 3. For each entry, depending on the status of the entry, perform
1797 * the following maintenance.
1798 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1799 * tick_count is above the max_unknown_frame_time, clear
1800 * the tick_count to zero and clear the packets_flooded counter
1801 * to zero. This supports the packet rate limit per address
1802 * while flooding unknowns.
1803 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1804 * than or equal to the path_switching_delay, change the status
1805 * to ESI_FORWARD_DIRECT. This causes the flush period to end
1806 * regardless of the progress of the flush protocol.
1807 */
1808 static void lec_arp_check_expire(struct work_struct *work)
1809 {
1810 unsigned long flags;
1811 struct lec_priv *priv =
1812 container_of(work, struct lec_priv, lec_arp_work.work);
1813 struct hlist_node *node, *next;
1814 struct lec_arp_table *entry;
1815 unsigned long now;
1816 int i;
1817
1818 pr_debug("%p\n", priv);
1819 now = jiffies;
1820 restart:
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, node, next,
1824 &priv->lec_arp_tables[i], next) {
1825 if (__lec_arp_check_expire(entry, now, priv)) {
1826 struct sk_buff *skb;
1827 struct atm_vcc *vcc = entry->vcc;
1828
1829 spin_unlock_irqrestore(&priv->lec_arp_lock,
1830 flags);
1831 while ((skb = skb_dequeue(&entry->tx_wait)))
1832 lec_send(vcc, skb);
1833 entry->last_used = jiffies;
1834 entry->status = ESI_FORWARD_DIRECT;
1835 lec_arp_put(entry);
1836
1837 goto restart;
1838 }
1839 }
1840 }
1841 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1842
1843 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1844 }
1845
1846 /*
1847 * Try to find vcc where mac_address is attached.
1848 *
1849 */
1850 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1851 const unsigned char *mac_to_find,
1852 int is_rdesc,
1853 struct lec_arp_table **ret_entry)
1854 {
1855 unsigned long flags;
1856 struct lec_arp_table *entry;
1857 struct atm_vcc *found;
1858
1859 if (mac_to_find[0] & 0x01) {
1860 switch (priv->lane_version) {
1861 case 1:
1862 return priv->mcast_vcc;
1863 case 2: /* LANE2 wants arp for multicast addresses */
1864 if (!compare_ether_addr(mac_to_find, bus_mac))
1865 return priv->mcast_vcc;
1866 break;
1867 default:
1868 break;
1869 }
1870 }
1871
1872 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1873 entry = lec_arp_find(priv, mac_to_find);
1874
1875 if (entry) {
1876 if (entry->status == ESI_FORWARD_DIRECT) {
1877 /* Connection Ok */
1878 entry->last_used = jiffies;
1879 lec_arp_hold(entry);
1880 *ret_entry = entry;
1881 found = entry->vcc;
1882 goto out;
1883 }
1884 /*
1885 * If the LE_ARP cache entry is still pending, reset count to 0
1886 * so another LE_ARP request can be made for this frame.
1887 */
1888 if (entry->status == ESI_ARP_PENDING)
1889 entry->no_tries = 0;
1890 /*
1891 * Data direct VC not yet set up, check to see if the unknown
1892 * frame count is greater than the limit. If the limit has
1893 * not been reached, allow the caller to send packet to
1894 * BUS.
1895 */
1896 if (entry->status != ESI_FLUSH_PENDING &&
1897 entry->packets_flooded <
1898 priv->maximum_unknown_frame_count) {
1899 entry->packets_flooded++;
1900 pr_debug("Flooding..\n");
1901 found = priv->mcast_vcc;
1902 goto out;
1903 }
1904 /*
1905 * We got here because entry->status == ESI_FLUSH_PENDING
1906 * or BUS flood limit was reached for an entry which is
1907 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1908 */
1909 lec_arp_hold(entry);
1910 *ret_entry = entry;
1911 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1912 entry->vcc);
1913 found = NULL;
1914 } else {
1915 /* No matching entry was found */
1916 entry = make_entry(priv, mac_to_find);
1917 pr_debug("Making entry\n");
1918 if (!entry) {
1919 found = priv->mcast_vcc;
1920 goto out;
1921 }
1922 lec_arp_add(priv, entry);
1923 /* We want arp-request(s) to be sent */
1924 entry->packets_flooded = 1;
1925 entry->status = ESI_ARP_PENDING;
1926 entry->no_tries = 1;
1927 entry->last_used = entry->timestamp = jiffies;
1928 entry->is_rdesc = is_rdesc;
1929 if (entry->is_rdesc)
1930 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1931 NULL);
1932 else
1933 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1934 entry->timer.expires = jiffies + (1 * HZ);
1935 entry->timer.function = lec_arp_expire_arp;
1936 add_timer(&entry->timer);
1937 found = priv->mcast_vcc;
1938 }
1939
1940 out:
1941 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1942 return found;
1943 }
1944
1945 static int
1946 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1947 unsigned long permanent)
1948 {
1949 unsigned long flags;
1950 struct hlist_node *node, *next;
1951 struct lec_arp_table *entry;
1952 int i;
1953
1954 pr_debug("\n");
1955 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1956 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1957 hlist_for_each_entry_safe(entry, node, next,
1958 &priv->lec_arp_tables[i], next) {
1959 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1960 (permanent ||
1961 !(entry->flags & LEC_PERMANENT_FLAG))) {
1962 lec_arp_remove(priv, entry);
1963 lec_arp_put(entry);
1964 }
1965 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1966 return 0;
1967 }
1968 }
1969 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1970 return -1;
1971 }
1972
1973 /*
1974 * Notifies: Response to arp_request (atm_addr != NULL)
1975 */
1976 static void
1977 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1978 const unsigned char *atm_addr, unsigned long remoteflag,
1979 unsigned int targetless_le_arp)
1980 {
1981 unsigned long flags;
1982 struct hlist_node *node, *next;
1983 struct lec_arp_table *entry, *tmp;
1984 int i;
1985
1986 pr_debug("%smac:%pM\n",
1987 (targetless_le_arp) ? "targetless " : "", mac_addr);
1988
1989 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1990 entry = lec_arp_find(priv, mac_addr);
1991 if (entry == NULL && targetless_le_arp)
1992 goto out; /*
1993 * LANE2: ignore targetless LE_ARPs for which
1994 * we have no entry in the cache. 7.1.30
1995 */
1996 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1997 hlist_for_each_entry_safe(entry, node, next,
1998 &priv->lec_arp_empty_ones, next) {
1999 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
2000 hlist_del(&entry->next);
2001 del_timer(&entry->timer);
2002 tmp = lec_arp_find(priv, mac_addr);
2003 if (tmp) {
2004 del_timer(&tmp->timer);
2005 tmp->status = ESI_FORWARD_DIRECT;
2006 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
2007 tmp->vcc = entry->vcc;
2008 tmp->old_push = entry->old_push;
2009 tmp->last_used = jiffies;
2010 del_timer(&entry->timer);
2011 lec_arp_put(entry);
2012 entry = tmp;
2013 } else {
2014 entry->status = ESI_FORWARD_DIRECT;
2015 memcpy(entry->mac_addr, mac_addr, ETH_ALEN);
2016 entry->last_used = jiffies;
2017 lec_arp_add(priv, entry);
2018 }
2019 if (remoteflag)
2020 entry->flags |= LEC_REMOTE_FLAG;
2021 else
2022 entry->flags &= ~LEC_REMOTE_FLAG;
2023 pr_debug("After update\n");
2024 dump_arp_table(priv);
2025 goto out;
2026 }
2027 }
2028 }
2029
2030 entry = lec_arp_find(priv, mac_addr);
2031 if (!entry) {
2032 entry = make_entry(priv, mac_addr);
2033 if (!entry)
2034 goto out;
2035 entry->status = ESI_UNKNOWN;
2036 lec_arp_add(priv, entry);
2037 /* Temporary, changes before end of function */
2038 }
2039 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
2040 del_timer(&entry->timer);
2041 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2042 hlist_for_each_entry(tmp, node,
2043 &priv->lec_arp_tables[i], next) {
2044 if (entry != tmp &&
2045 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
2046 /* Vcc to this host exists */
2047 if (tmp->status > ESI_VC_PENDING) {
2048 /*
2049 * ESI_FLUSH_PENDING,
2050 * ESI_FORWARD_DIRECT
2051 */
2052 entry->vcc = tmp->vcc;
2053 entry->old_push = tmp->old_push;
2054 }
2055 entry->status = tmp->status;
2056 break;
2057 }
2058 }
2059 }
2060 if (remoteflag)
2061 entry->flags |= LEC_REMOTE_FLAG;
2062 else
2063 entry->flags &= ~LEC_REMOTE_FLAG;
2064 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
2065 entry->status = ESI_VC_PENDING;
2066 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
2067 }
2068 pr_debug("After update2\n");
2069 dump_arp_table(priv);
2070 out:
2071 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2072 }
2073
2074 /*
2075 * Notifies: Vcc setup ready
2076 */
2077 static void
2078 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
2079 struct atm_vcc *vcc,
2080 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
2081 {
2082 unsigned long flags;
2083 struct hlist_node *node;
2084 struct lec_arp_table *entry;
2085 int i, found_entry = 0;
2086
2087 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2088 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
2089 if (ioc_data->receive == 2) {
2090 pr_debug("LEC_ARP: Attaching mcast forward\n");
2091 #if 0
2092 entry = lec_arp_find(priv, bus_mac);
2093 if (!entry) {
2094 pr_info("LEC_ARP: Multicast entry not found!\n");
2095 goto out;
2096 }
2097 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2098 entry->recv_vcc = vcc;
2099 entry->old_recv_push = old_push;
2100 #endif
2101 entry = make_entry(priv, bus_mac);
2102 if (entry == NULL)
2103 goto out;
2104 del_timer(&entry->timer);
2105 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2106 entry->recv_vcc = vcc;
2107 entry->old_recv_push = old_push;
2108 hlist_add_head(&entry->next, &priv->mcast_fwds);
2109 goto out;
2110 } else if (ioc_data->receive == 1) {
2111 /*
2112 * Vcc which we don't want to make default vcc,
2113 * attach it anyway.
2114 */
2115 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",
2116 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2117 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2118 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2119 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2120 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2121 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2122 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2123 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2124 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2125 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2126 entry = make_entry(priv, bus_mac);
2127 if (entry == NULL)
2128 goto out;
2129 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2130 memset(entry->mac_addr, 0, ETH_ALEN);
2131 entry->recv_vcc = vcc;
2132 entry->old_recv_push = old_push;
2133 entry->status = ESI_UNKNOWN;
2134 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2135 entry->timer.function = lec_arp_expire_vcc;
2136 hlist_add_head(&entry->next, &priv->lec_no_forward);
2137 add_timer(&entry->timer);
2138 dump_arp_table(priv);
2139 goto out;
2140 }
2141 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",
2142 ioc_data->atm_addr[0], ioc_data->atm_addr[1],
2143 ioc_data->atm_addr[2], ioc_data->atm_addr[3],
2144 ioc_data->atm_addr[4], ioc_data->atm_addr[5],
2145 ioc_data->atm_addr[6], ioc_data->atm_addr[7],
2146 ioc_data->atm_addr[8], ioc_data->atm_addr[9],
2147 ioc_data->atm_addr[10], ioc_data->atm_addr[11],
2148 ioc_data->atm_addr[12], ioc_data->atm_addr[13],
2149 ioc_data->atm_addr[14], ioc_data->atm_addr[15],
2150 ioc_data->atm_addr[16], ioc_data->atm_addr[17],
2151 ioc_data->atm_addr[18], ioc_data->atm_addr[19]);
2152 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2153 hlist_for_each_entry(entry, node,
2154 &priv->lec_arp_tables[i], next) {
2155 if (memcmp
2156 (ioc_data->atm_addr, entry->atm_addr,
2157 ATM_ESA_LEN) == 0) {
2158 pr_debug("LEC_ARP: Attaching data direct\n");
2159 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
2160 entry->vcc ? entry->vcc->vci : 0,
2161 entry->recv_vcc ? entry->recv_vcc->
2162 vci : 0);
2163 found_entry = 1;
2164 del_timer(&entry->timer);
2165 entry->vcc = vcc;
2166 entry->old_push = old_push;
2167 if (entry->status == ESI_VC_PENDING) {
2168 if (priv->maximum_unknown_frame_count
2169 == 0)
2170 entry->status =
2171 ESI_FORWARD_DIRECT;
2172 else {
2173 entry->timestamp = jiffies;
2174 entry->status =
2175 ESI_FLUSH_PENDING;
2176 #if 0
2177 send_to_lecd(priv, l_flush_xmt,
2178 NULL,
2179 entry->atm_addr,
2180 NULL);
2181 #endif
2182 }
2183 } else {
2184 /*
2185 * They were forming a connection
2186 * to us, and we to them. Our
2187 * ATM address is numerically lower
2188 * than theirs, so we make connection
2189 * we formed into default VCC (8.1.11).
2190 * Connection they made gets torn
2191 * down. This might confuse some
2192 * clients. Can be changed if
2193 * someone reports trouble...
2194 */
2195 ;
2196 }
2197 }
2198 }
2199 }
2200 if (found_entry) {
2201 pr_debug("After vcc was added\n");
2202 dump_arp_table(priv);
2203 goto out;
2204 }
2205 /*
2206 * Not found, snatch address from first data packet that arrives
2207 * from this vcc
2208 */
2209 entry = make_entry(priv, bus_mac);
2210 if (!entry)
2211 goto out;
2212 entry->vcc = vcc;
2213 entry->old_push = old_push;
2214 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2215 memset(entry->mac_addr, 0, ETH_ALEN);
2216 entry->status = ESI_UNKNOWN;
2217 hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2218 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2219 entry->timer.function = lec_arp_expire_vcc;
2220 add_timer(&entry->timer);
2221 pr_debug("After vcc was added\n");
2222 dump_arp_table(priv);
2223 out:
2224 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2225 }
2226
2227 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2228 {
2229 unsigned long flags;
2230 struct hlist_node *node;
2231 struct lec_arp_table *entry;
2232 int i;
2233
2234 pr_debug("%lx\n", tran_id);
2235 restart:
2236 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2237 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2238 hlist_for_each_entry(entry, node,
2239 &priv->lec_arp_tables[i], next) {
2240 if (entry->flush_tran_id == tran_id &&
2241 entry->status == ESI_FLUSH_PENDING) {
2242 struct sk_buff *skb;
2243 struct atm_vcc *vcc = entry->vcc;
2244
2245 lec_arp_hold(entry);
2246 spin_unlock_irqrestore(&priv->lec_arp_lock,
2247 flags);
2248 while ((skb = skb_dequeue(&entry->tx_wait)))
2249 lec_send(vcc, skb);
2250 entry->last_used = jiffies;
2251 entry->status = ESI_FORWARD_DIRECT;
2252 lec_arp_put(entry);
2253 pr_debug("LEC_ARP: Flushed\n");
2254 goto restart;
2255 }
2256 }
2257 }
2258 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2259 dump_arp_table(priv);
2260 }
2261
2262 static void
2263 lec_set_flush_tran_id(struct lec_priv *priv,
2264 const unsigned char *atm_addr, unsigned long tran_id)
2265 {
2266 unsigned long flags;
2267 struct hlist_node *node;
2268 struct lec_arp_table *entry;
2269 int i;
2270
2271 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2272 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2273 hlist_for_each_entry(entry, node,
2274 &priv->lec_arp_tables[i], next) {
2275 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2276 entry->flush_tran_id = tran_id;
2277 pr_debug("Set flush transaction id to %lx for %p\n",
2278 tran_id, entry);
2279 }
2280 }
2281 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2282 }
2283
2284 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2285 {
2286 unsigned long flags;
2287 unsigned char mac_addr[] = {
2288 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2289 };
2290 struct lec_arp_table *to_add;
2291 struct lec_vcc_priv *vpriv;
2292 int err = 0;
2293
2294 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2295 if (!vpriv)
2296 return -ENOMEM;
2297 vpriv->xoff = 0;
2298 vpriv->old_pop = vcc->pop;
2299 vcc->user_back = vpriv;
2300 vcc->pop = lec_pop;
2301 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2302 to_add = make_entry(priv, mac_addr);
2303 if (!to_add) {
2304 vcc->pop = vpriv->old_pop;
2305 kfree(vpriv);
2306 err = -ENOMEM;
2307 goto out;
2308 }
2309 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2310 to_add->status = ESI_FORWARD_DIRECT;
2311 to_add->flags |= LEC_PERMANENT_FLAG;
2312 to_add->vcc = vcc;
2313 to_add->old_push = vcc->push;
2314 vcc->push = lec_push;
2315 priv->mcast_vcc = vcc;
2316 lec_arp_add(priv, to_add);
2317 out:
2318 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2319 return err;
2320 }
2321
2322 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2323 {
2324 unsigned long flags;
2325 struct hlist_node *node, *next;
2326 struct lec_arp_table *entry;
2327 int i;
2328
2329 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2330 dump_arp_table(priv);
2331
2332 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2333
2334 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2335 hlist_for_each_entry_safe(entry, node, next,
2336 &priv->lec_arp_tables[i], next) {
2337 if (vcc == entry->vcc) {
2338 lec_arp_remove(priv, entry);
2339 lec_arp_put(entry);
2340 if (priv->mcast_vcc == vcc)
2341 priv->mcast_vcc = NULL;
2342 }
2343 }
2344 }
2345
2346 hlist_for_each_entry_safe(entry, node, next,
2347 &priv->lec_arp_empty_ones, next) {
2348 if (entry->vcc == vcc) {
2349 lec_arp_clear_vccs(entry);
2350 del_timer(&entry->timer);
2351 hlist_del(&entry->next);
2352 lec_arp_put(entry);
2353 }
2354 }
2355
2356 hlist_for_each_entry_safe(entry, node, next,
2357 &priv->lec_no_forward, next) {
2358 if (entry->recv_vcc == vcc) {
2359 lec_arp_clear_vccs(entry);
2360 del_timer(&entry->timer);
2361 hlist_del(&entry->next);
2362 lec_arp_put(entry);
2363 }
2364 }
2365
2366 hlist_for_each_entry_safe(entry, node, next, &priv->mcast_fwds, next) {
2367 if (entry->recv_vcc == vcc) {
2368 lec_arp_clear_vccs(entry);
2369 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2370 hlist_del(&entry->next);
2371 lec_arp_put(entry);
2372 }
2373 }
2374
2375 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2376 dump_arp_table(priv);
2377 }
2378
2379 static void
2380 lec_arp_check_empties(struct lec_priv *priv,
2381 struct atm_vcc *vcc, struct sk_buff *skb)
2382 {
2383 unsigned long flags;
2384 struct hlist_node *node, *next;
2385 struct lec_arp_table *entry, *tmp;
2386 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2387 unsigned char *src;
2388 #ifdef CONFIG_TR
2389 struct lecdatahdr_8025 *tr_hdr = (struct lecdatahdr_8025 *)skb->data;
2390
2391 if (priv->is_trdev)
2392 src = tr_hdr->h_source;
2393 else
2394 #endif
2395 src = hdr->h_source;
2396
2397 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2398 hlist_for_each_entry_safe(entry, node, next,
2399 &priv->lec_arp_empty_ones, next) {
2400 if (vcc == entry->vcc) {
2401 del_timer(&entry->timer);
2402 memcpy(entry->mac_addr, src, ETH_ALEN);
2403 entry->status = ESI_FORWARD_DIRECT;
2404 entry->last_used = jiffies;
2405 /* We might have got an entry */
2406 tmp = lec_arp_find(priv, src);
2407 if (tmp) {
2408 lec_arp_remove(priv, tmp);
2409 lec_arp_put(tmp);
2410 }
2411 hlist_del(&entry->next);
2412 lec_arp_add(priv, entry);
2413 goto out;
2414 }
2415 }
2416 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2417 out:
2418 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2419 }
2420
2421 MODULE_LICENSE("GPL");
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