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