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