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