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 static DEFINE_MUTEX(lec_mutex);
128
129 #if IS_ENABLED(CONFIG_BRIDGE)
lec_handle_bridge(struct sk_buff * skb,struct net_device * dev)130 static void lec_handle_bridge(struct sk_buff *skb, struct net_device *dev)
131 {
132 char *buff;
133 struct lec_priv *priv;
134
135 /*
136 * Check if this is a BPDU. If so, ask zeppelin to send
137 * LE_TOPOLOGY_REQUEST with the same value of Topology Change bit
138 * as the Config BPDU has
139 */
140 buff = skb->data + skb->dev->hard_header_len;
141 if (*buff++ == 0x42 && *buff++ == 0x42 && *buff++ == 0x03) {
142 struct sock *sk;
143 struct sk_buff *skb2;
144 struct atmlec_msg *mesg;
145
146 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
147 if (skb2 == NULL)
148 return;
149 skb2->len = sizeof(struct atmlec_msg);
150 mesg = (struct atmlec_msg *)skb2->data;
151 mesg->type = l_topology_change;
152 buff += 4;
153 mesg->content.normal.flag = *buff & 0x01;
154 /* 0x01 is topology change */
155
156 priv = netdev_priv(dev);
157 atm_force_charge(priv->lecd, skb2->truesize);
158 sk = sk_atm(priv->lecd);
159 skb_queue_tail(&sk->sk_receive_queue, skb2);
160 sk->sk_data_ready(sk);
161 }
162 }
163 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
164
165 /*
166 * Open/initialize the netdevice. This is called (in the current kernel)
167 * sometime after booting when the 'ifconfig' program is run.
168 *
169 * This routine should set everything up anew at each open, even
170 * registers that "should" only need to be set once at boot, so that
171 * there is non-reboot way to recover if something goes wrong.
172 */
173
lec_open(struct net_device * dev)174 static int lec_open(struct net_device *dev)
175 {
176 netif_start_queue(dev);
177
178 return 0;
179 }
180
181 static void
lec_send(struct atm_vcc * vcc,struct sk_buff * skb)182 lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
183 {
184 struct net_device *dev = skb->dev;
185 unsigned int len = skb->len;
186
187 ATM_SKB(skb)->vcc = vcc;
188 atm_account_tx(vcc, skb);
189
190 if (vcc->send(vcc, skb) < 0) {
191 dev->stats.tx_dropped++;
192 return;
193 }
194
195 dev->stats.tx_packets++;
196 dev->stats.tx_bytes += len;
197 }
198
lec_tx_timeout(struct net_device * dev,unsigned int txqueue)199 static void lec_tx_timeout(struct net_device *dev, unsigned int txqueue)
200 {
201 pr_info("%s\n", dev->name);
202 netif_trans_update(dev);
203 netif_wake_queue(dev);
204 }
205
lec_start_xmit(struct sk_buff * skb,struct net_device * dev)206 static netdev_tx_t lec_start_xmit(struct sk_buff *skb,
207 struct net_device *dev)
208 {
209 struct sk_buff *skb2;
210 struct lec_priv *priv = netdev_priv(dev);
211 struct lecdatahdr_8023 *lec_h;
212 struct atm_vcc *vcc;
213 struct lec_arp_table *entry;
214 unsigned char *dst;
215 int min_frame_size;
216 int is_rdesc;
217
218 pr_debug("called\n");
219 if (!priv->lecd) {
220 pr_info("%s:No lecd attached\n", dev->name);
221 dev->stats.tx_errors++;
222 netif_stop_queue(dev);
223 kfree_skb(skb);
224 return NETDEV_TX_OK;
225 }
226
227 pr_debug("skbuff head:%lx data:%lx tail:%lx end:%lx\n",
228 (long)skb->head, (long)skb->data, (long)skb_tail_pointer(skb),
229 (long)skb_end_pointer(skb));
230 #if IS_ENABLED(CONFIG_BRIDGE)
231 if (memcmp(skb->data, bridge_ula_lec, sizeof(bridge_ula_lec)) == 0)
232 lec_handle_bridge(skb, dev);
233 #endif
234
235 /* Make sure we have room for lec_id */
236 if (skb_headroom(skb) < 2) {
237 pr_debug("reallocating skb\n");
238 skb2 = skb_realloc_headroom(skb, LEC_HEADER_LEN);
239 if (unlikely(!skb2)) {
240 kfree_skb(skb);
241 return NETDEV_TX_OK;
242 }
243 consume_skb(skb);
244 skb = skb2;
245 }
246 skb_push(skb, 2);
247
248 /* Put le header to place */
249 lec_h = (struct lecdatahdr_8023 *)skb->data;
250 lec_h->le_header = htons(priv->lecid);
251
252 #if DUMP_PACKETS >= 2
253 #define MAX_DUMP_SKB 99
254 #elif DUMP_PACKETS >= 1
255 #define MAX_DUMP_SKB 30
256 #endif
257 #if DUMP_PACKETS >= 1
258 printk(KERN_DEBUG "%s: send datalen:%ld lecid:%4.4x\n",
259 dev->name, skb->len, priv->lecid);
260 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
261 skb->data, min(skb->len, MAX_DUMP_SKB), true);
262 #endif /* DUMP_PACKETS >= 1 */
263
264 /* Minimum ethernet-frame size */
265 min_frame_size = LEC_MINIMUM_8023_SIZE;
266 if (skb->len < min_frame_size) {
267 if ((skb->len + skb_tailroom(skb)) < min_frame_size) {
268 skb2 = skb_copy_expand(skb, 0,
269 min_frame_size - skb->truesize,
270 GFP_ATOMIC);
271 dev_kfree_skb(skb);
272 if (skb2 == NULL) {
273 dev->stats.tx_dropped++;
274 return NETDEV_TX_OK;
275 }
276 skb = skb2;
277 }
278 skb_put(skb, min_frame_size - skb->len);
279 }
280
281 /* Send to right vcc */
282 is_rdesc = 0;
283 dst = lec_h->h_dest;
284 entry = NULL;
285 vcc = lec_arp_resolve(priv, dst, is_rdesc, &entry);
286 pr_debug("%s:vcc:%p vcc_flags:%lx, entry:%p\n",
287 dev->name, vcc, vcc ? vcc->flags : 0, entry);
288 if (!vcc || !test_bit(ATM_VF_READY, &vcc->flags)) {
289 if (entry && (entry->tx_wait.qlen < LEC_UNRES_QUE_LEN)) {
290 pr_debug("%s:queuing packet, MAC address %pM\n",
291 dev->name, lec_h->h_dest);
292 skb_queue_tail(&entry->tx_wait, skb);
293 } else {
294 pr_debug("%s:tx queue full or no arp entry, dropping, MAC address: %pM\n",
295 dev->name, lec_h->h_dest);
296 dev->stats.tx_dropped++;
297 dev_kfree_skb(skb);
298 }
299 goto out;
300 }
301 #if DUMP_PACKETS > 0
302 printk(KERN_DEBUG "%s:sending to vpi:%d vci:%d\n",
303 dev->name, vcc->vpi, vcc->vci);
304 #endif /* DUMP_PACKETS > 0 */
305
306 while (entry && (skb2 = skb_dequeue(&entry->tx_wait))) {
307 pr_debug("emptying tx queue, MAC address %pM\n", lec_h->h_dest);
308 lec_send(vcc, skb2);
309 }
310
311 lec_send(vcc, skb);
312
313 if (!atm_may_send(vcc, 0)) {
314 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
315
316 vpriv->xoff = 1;
317 netif_stop_queue(dev);
318
319 /*
320 * vcc->pop() might have occurred in between, making
321 * the vcc usuable again. Since xmit is serialized,
322 * this is the only situation we have to re-test.
323 */
324
325 if (atm_may_send(vcc, 0))
326 netif_wake_queue(dev);
327 }
328
329 out:
330 if (entry)
331 lec_arp_put(entry);
332 netif_trans_update(dev);
333 return NETDEV_TX_OK;
334 }
335
336 /* The inverse routine to net_open(). */
lec_close(struct net_device * dev)337 static int lec_close(struct net_device *dev)
338 {
339 netif_stop_queue(dev);
340 return 0;
341 }
342
lec_atm_send(struct atm_vcc * vcc,struct sk_buff * skb)343 static int lec_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
344 {
345 static const u8 zero_addr[ETH_ALEN] = {};
346 unsigned long flags;
347 struct net_device *dev = (struct net_device *)vcc->proto_data;
348 struct lec_priv *priv = netdev_priv(dev);
349 struct atmlec_msg *mesg;
350 struct lec_arp_table *entry;
351 char *tmp; /* FIXME */
352
353 WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
354 mesg = (struct atmlec_msg *)skb->data;
355 tmp = skb->data;
356 tmp += sizeof(struct atmlec_msg);
357 pr_debug("%s: msg from zeppelin:%d\n", dev->name, mesg->type);
358 switch (mesg->type) {
359 case l_set_mac_addr:
360 eth_hw_addr_set(dev, mesg->content.normal.mac_addr);
361 break;
362 case l_del_mac_addr:
363 eth_hw_addr_set(dev, zero_addr);
364 break;
365 case l_addr_delete:
366 lec_addr_delete(priv, mesg->content.normal.atm_addr,
367 mesg->content.normal.flag);
368 break;
369 case l_topology_change:
370 priv->topology_change = mesg->content.normal.flag;
371 break;
372 case l_flush_complete:
373 lec_flush_complete(priv, mesg->content.normal.flag);
374 break;
375 case l_narp_req: /* LANE2: see 7.1.35 in the lane2 spec */
376 spin_lock_irqsave(&priv->lec_arp_lock, flags);
377 entry = lec_arp_find(priv, mesg->content.normal.mac_addr);
378 lec_arp_remove(priv, entry);
379 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
380
381 if (mesg->content.normal.no_source_le_narp)
382 break;
383 fallthrough;
384 case l_arp_update:
385 lec_arp_update(priv, mesg->content.normal.mac_addr,
386 mesg->content.normal.atm_addr,
387 mesg->content.normal.flag,
388 mesg->content.normal.targetless_le_arp);
389 pr_debug("in l_arp_update\n");
390 if (mesg->sizeoftlvs != 0) { /* LANE2 3.1.5 */
391 pr_debug("LANE2 3.1.5, got tlvs, size %d\n",
392 mesg->sizeoftlvs);
393 lane2_associate_ind(dev, mesg->content.normal.mac_addr,
394 tmp, mesg->sizeoftlvs);
395 }
396 break;
397 case l_config:
398 priv->maximum_unknown_frame_count =
399 mesg->content.config.maximum_unknown_frame_count;
400 priv->max_unknown_frame_time =
401 (mesg->content.config.max_unknown_frame_time * HZ);
402 priv->max_retry_count = mesg->content.config.max_retry_count;
403 priv->aging_time = (mesg->content.config.aging_time * HZ);
404 priv->forward_delay_time =
405 (mesg->content.config.forward_delay_time * HZ);
406 priv->arp_response_time =
407 (mesg->content.config.arp_response_time * HZ);
408 priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
409 priv->path_switching_delay =
410 (mesg->content.config.path_switching_delay * HZ);
411 priv->lane_version = mesg->content.config.lane_version;
412 /* LANE2 */
413 priv->lane2_ops = NULL;
414 if (priv->lane_version > 1)
415 priv->lane2_ops = &lane2_ops;
416 rtnl_lock();
417 if (dev_set_mtu(dev, mesg->content.config.mtu))
418 pr_info("%s: change_mtu to %d failed\n",
419 dev->name, mesg->content.config.mtu);
420 rtnl_unlock();
421 priv->is_proxy = mesg->content.config.is_proxy;
422 break;
423 case l_flush_tran_id:
424 lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
425 mesg->content.normal.flag);
426 break;
427 case l_set_lecid:
428 priv->lecid =
429 (unsigned short)(0xffff & mesg->content.normal.flag);
430 break;
431 case l_should_bridge:
432 #if IS_ENABLED(CONFIG_BRIDGE)
433 {
434 pr_debug("%s: bridge zeppelin asks about %pM\n",
435 dev->name, mesg->content.proxy.mac_addr);
436
437 if (br_fdb_test_addr_hook == NULL)
438 break;
439
440 if (br_fdb_test_addr_hook(dev, mesg->content.proxy.mac_addr)) {
441 /* hit from bridge table, send LE_ARP_RESPONSE */
442 struct sk_buff *skb2;
443 struct sock *sk;
444
445 pr_debug("%s: entry found, responding to zeppelin\n",
446 dev->name);
447 skb2 = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
448 if (skb2 == NULL)
449 break;
450 skb2->len = sizeof(struct atmlec_msg);
451 skb_copy_to_linear_data(skb2, mesg, sizeof(*mesg));
452 atm_force_charge(priv->lecd, skb2->truesize);
453 sk = sk_atm(priv->lecd);
454 skb_queue_tail(&sk->sk_receive_queue, skb2);
455 sk->sk_data_ready(sk);
456 }
457 }
458 #endif /* IS_ENABLED(CONFIG_BRIDGE) */
459 break;
460 default:
461 pr_info("%s: Unknown message type %d\n", dev->name, mesg->type);
462 dev_kfree_skb(skb);
463 return -EINVAL;
464 }
465 dev_kfree_skb(skb);
466 return 0;
467 }
468
lec_atm_close(struct atm_vcc * vcc)469 static void lec_atm_close(struct atm_vcc *vcc)
470 {
471 struct sk_buff *skb;
472 struct net_device *dev = (struct net_device *)vcc->proto_data;
473 struct lec_priv *priv = netdev_priv(dev);
474
475 priv->lecd = NULL;
476 /* Do something needful? */
477
478 netif_stop_queue(dev);
479 lec_arp_destroy(priv);
480
481 if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
482 pr_info("%s closing with messages pending\n", dev->name);
483 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
484 atm_return(vcc, skb->truesize);
485 dev_kfree_skb(skb);
486 }
487
488 pr_info("%s: Shut down!\n", dev->name);
489 module_put(THIS_MODULE);
490 }
491
492 static const struct atmdev_ops lecdev_ops = {
493 .close = lec_atm_close,
494 .send = lec_atm_send
495 };
496
497 static struct atm_dev lecatm_dev = {
498 .ops = &lecdev_ops,
499 .type = "lec",
500 .number = 999, /* dummy device number */
501 .lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
502 };
503
504 /*
505 * LANE2: new argument struct sk_buff *data contains
506 * the LE_ARP based TLVs introduced in the LANE2 spec
507 */
508 static int
send_to_lecd(struct lec_priv * priv,atmlec_msg_type type,const unsigned char * mac_addr,const unsigned char * atm_addr,struct sk_buff * data)509 send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
510 const unsigned char *mac_addr, const unsigned char *atm_addr,
511 struct sk_buff *data)
512 {
513 struct sock *sk;
514 struct sk_buff *skb;
515 struct atmlec_msg *mesg;
516
517 if (!priv || !priv->lecd)
518 return -1;
519 skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
520 if (!skb)
521 return -1;
522 skb->len = sizeof(struct atmlec_msg);
523 mesg = (struct atmlec_msg *)skb->data;
524 memset(mesg, 0, sizeof(struct atmlec_msg));
525 mesg->type = type;
526 if (data != NULL)
527 mesg->sizeoftlvs = data->len;
528 if (mac_addr)
529 ether_addr_copy(mesg->content.normal.mac_addr, mac_addr);
530 else
531 mesg->content.normal.targetless_le_arp = 1;
532 if (atm_addr)
533 memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);
534
535 atm_force_charge(priv->lecd, skb->truesize);
536 sk = sk_atm(priv->lecd);
537 skb_queue_tail(&sk->sk_receive_queue, skb);
538 sk->sk_data_ready(sk);
539
540 if (data != NULL) {
541 pr_debug("about to send %d bytes of data\n", data->len);
542 atm_force_charge(priv->lecd, data->truesize);
543 skb_queue_tail(&sk->sk_receive_queue, data);
544 sk->sk_data_ready(sk);
545 }
546
547 return 0;
548 }
549
lec_set_multicast_list(struct net_device * dev)550 static void lec_set_multicast_list(struct net_device *dev)
551 {
552 /*
553 * by default, all multicast frames arrive over the bus.
554 * eventually support selective multicast service
555 */
556 }
557
558 static const struct net_device_ops lec_netdev_ops = {
559 .ndo_open = lec_open,
560 .ndo_stop = lec_close,
561 .ndo_start_xmit = lec_start_xmit,
562 .ndo_tx_timeout = lec_tx_timeout,
563 .ndo_set_rx_mode = lec_set_multicast_list,
564 };
565
566 static const unsigned char lec_ctrl_magic[] = {
567 0xff,
568 0x00,
569 0x01,
570 0x01
571 };
572
573 #define LEC_DATA_DIRECT_8023 2
574 #define LEC_DATA_DIRECT_8025 3
575
lec_is_data_direct(struct atm_vcc * vcc)576 static int lec_is_data_direct(struct atm_vcc *vcc)
577 {
578 return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
579 (vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
580 }
581
lec_push(struct atm_vcc * vcc,struct sk_buff * skb)582 static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
583 {
584 unsigned long flags;
585 struct net_device *dev = (struct net_device *)vcc->proto_data;
586 struct lec_priv *priv = netdev_priv(dev);
587
588 #if DUMP_PACKETS > 0
589 printk(KERN_DEBUG "%s: vcc vpi:%d vci:%d\n",
590 dev->name, vcc->vpi, vcc->vci);
591 #endif
592 if (!skb) {
593 pr_debug("%s: null skb\n", dev->name);
594 lec_vcc_close(priv, vcc);
595 return;
596 }
597 #if DUMP_PACKETS >= 2
598 #define MAX_SKB_DUMP 99
599 #elif DUMP_PACKETS >= 1
600 #define MAX_SKB_DUMP 30
601 #endif
602 #if DUMP_PACKETS > 0
603 printk(KERN_DEBUG "%s: rcv datalen:%ld lecid:%4.4x\n",
604 dev->name, skb->len, priv->lecid);
605 print_hex_dump(KERN_DEBUG, "", DUMP_OFFSET, 16, 1,
606 skb->data, min(MAX_SKB_DUMP, skb->len), true);
607 #endif /* DUMP_PACKETS > 0 */
608 if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {
609 /* Control frame, to daemon */
610 struct sock *sk = sk_atm(vcc);
611
612 pr_debug("%s: To daemon\n", dev->name);
613 skb_queue_tail(&sk->sk_receive_queue, skb);
614 sk->sk_data_ready(sk);
615 } else { /* Data frame, queue to protocol handlers */
616 struct lec_arp_table *entry;
617 unsigned char *src, *dst;
618
619 atm_return(vcc, skb->truesize);
620 if (*(__be16 *) skb->data == htons(priv->lecid) ||
621 !priv->lecd || !(dev->flags & IFF_UP)) {
622 /*
623 * Probably looping back, or if lecd is missing,
624 * lecd has gone down
625 */
626 pr_debug("Ignoring frame...\n");
627 dev_kfree_skb(skb);
628 return;
629 }
630 dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;
631
632 /*
633 * If this is a Data Direct VCC, and the VCC does not match
634 * the LE_ARP cache entry, delete the LE_ARP cache entry.
635 */
636 spin_lock_irqsave(&priv->lec_arp_lock, flags);
637 if (lec_is_data_direct(vcc)) {
638 src = ((struct lecdatahdr_8023 *)skb->data)->h_source;
639 entry = lec_arp_find(priv, src);
640 if (entry && entry->vcc != vcc) {
641 lec_arp_remove(priv, entry);
642 lec_arp_put(entry);
643 }
644 }
645 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
646
647 if (!(dst[0] & 0x01) && /* Never filter Multi/Broadcast */
648 !priv->is_proxy && /* Proxy wants all the packets */
649 memcmp(dst, dev->dev_addr, dev->addr_len)) {
650 dev_kfree_skb(skb);
651 return;
652 }
653 if (!hlist_empty(&priv->lec_arp_empty_ones))
654 lec_arp_check_empties(priv, vcc, skb);
655 skb_pull(skb, 2); /* skip lec_id */
656 skb->protocol = eth_type_trans(skb, dev);
657 dev->stats.rx_packets++;
658 dev->stats.rx_bytes += skb->len;
659 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
660 netif_rx(skb);
661 }
662 }
663
lec_pop(struct atm_vcc * vcc,struct sk_buff * skb)664 static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
665 {
666 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
667 struct net_device *dev = skb->dev;
668
669 if (vpriv == NULL) {
670 pr_info("vpriv = NULL!?!?!?\n");
671 return;
672 }
673
674 vpriv->old_pop(vcc, skb);
675
676 if (vpriv->xoff && atm_may_send(vcc, 0)) {
677 vpriv->xoff = 0;
678 if (netif_running(dev) && netif_queue_stopped(dev))
679 netif_wake_queue(dev);
680 }
681 }
682
lec_vcc_attach(struct atm_vcc * vcc,void __user * arg)683 static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
684 {
685 struct lec_vcc_priv *vpriv;
686 int bytes_left;
687 struct atmlec_ioc ioc_data;
688
689 lockdep_assert_held(&lec_mutex);
690 /* Lecd must be up in this case */
691 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
692 if (bytes_left != 0)
693 pr_info("copy from user failed for %d bytes\n", bytes_left);
694 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
695 return -EINVAL;
696 ioc_data.dev_num = array_index_nospec(ioc_data.dev_num, MAX_LEC_ITF);
697 if (!dev_lec[ioc_data.dev_num])
698 return -EINVAL;
699 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
700 if (!vpriv)
701 return -ENOMEM;
702 vpriv->xoff = 0;
703 vpriv->old_pop = vcc->pop;
704 vcc->user_back = vpriv;
705 vcc->pop = lec_pop;
706 lec_vcc_added(netdev_priv(dev_lec[ioc_data.dev_num]),
707 &ioc_data, vcc, vcc->push);
708 vcc->proto_data = dev_lec[ioc_data.dev_num];
709 vcc->push = lec_push;
710 return 0;
711 }
712
lec_mcast_attach(struct atm_vcc * vcc,int arg)713 static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
714 {
715 lockdep_assert_held(&lec_mutex);
716 if (arg < 0 || arg >= MAX_LEC_ITF)
717 return -EINVAL;
718 arg = array_index_nospec(arg, MAX_LEC_ITF);
719 if (!dev_lec[arg])
720 return -EINVAL;
721 vcc->proto_data = dev_lec[arg];
722 return lec_mcast_make(netdev_priv(dev_lec[arg]), vcc);
723 }
724
725 /* Initialize device. */
lecd_attach(struct atm_vcc * vcc,int arg)726 static int lecd_attach(struct atm_vcc *vcc, int arg)
727 {
728 int i;
729 struct lec_priv *priv;
730
731 lockdep_assert_held(&lec_mutex);
732 if (arg < 0)
733 arg = 0;
734 if (arg >= MAX_LEC_ITF)
735 return -EINVAL;
736 i = array_index_nospec(arg, MAX_LEC_ITF);
737 if (!dev_lec[i]) {
738 int size;
739
740 size = sizeof(struct lec_priv);
741 dev_lec[i] = alloc_etherdev(size);
742 if (!dev_lec[i])
743 return -ENOMEM;
744 dev_lec[i]->netdev_ops = &lec_netdev_ops;
745 dev_lec[i]->max_mtu = 18190;
746 snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
747 if (register_netdev(dev_lec[i])) {
748 free_netdev(dev_lec[i]);
749 dev_lec[i] = NULL;
750 return -EINVAL;
751 }
752
753 priv = netdev_priv(dev_lec[i]);
754 } else {
755 priv = netdev_priv(dev_lec[i]);
756 if (priv->lecd)
757 return -EADDRINUSE;
758 }
759 lec_arp_init(priv);
760 priv->itfnum = i; /* LANE2 addition */
761 priv->lecd = vcc;
762 vcc->dev = &lecatm_dev;
763 vcc_insert_socket(sk_atm(vcc));
764
765 vcc->proto_data = dev_lec[i];
766 set_bit(ATM_VF_META, &vcc->flags);
767 set_bit(ATM_VF_READY, &vcc->flags);
768
769 /* Set default values to these variables */
770 priv->maximum_unknown_frame_count = 1;
771 priv->max_unknown_frame_time = (1 * HZ);
772 priv->vcc_timeout_period = (1200 * HZ);
773 priv->max_retry_count = 1;
774 priv->aging_time = (300 * HZ);
775 priv->forward_delay_time = (15 * HZ);
776 priv->topology_change = 0;
777 priv->arp_response_time = (1 * HZ);
778 priv->flush_timeout = (4 * HZ);
779 priv->path_switching_delay = (6 * HZ);
780
781 if (dev_lec[i]->flags & IFF_UP)
782 netif_start_queue(dev_lec[i]);
783 __module_get(THIS_MODULE);
784 return i;
785 }
786
787 #ifdef CONFIG_PROC_FS
lec_arp_get_status_string(unsigned char status)788 static const char *lec_arp_get_status_string(unsigned char status)
789 {
790 static const char *const lec_arp_status_string[] = {
791 "ESI_UNKNOWN ",
792 "ESI_ARP_PENDING ",
793 "ESI_VC_PENDING ",
794 "<Undefined> ",
795 "ESI_FLUSH_PENDING ",
796 "ESI_FORWARD_DIRECT"
797 };
798
799 if (status > ESI_FORWARD_DIRECT)
800 status = 3; /* ESI_UNDEFINED */
801 return lec_arp_status_string[status];
802 }
803
lec_info(struct seq_file * seq,struct lec_arp_table * entry)804 static void lec_info(struct seq_file *seq, struct lec_arp_table *entry)
805 {
806 seq_printf(seq, "%pM ", entry->mac_addr);
807 seq_printf(seq, "%*phN ", ATM_ESA_LEN, entry->atm_addr);
808 seq_printf(seq, "%s %4.4x", lec_arp_get_status_string(entry->status),
809 entry->flags & 0xffff);
810 if (entry->vcc)
811 seq_printf(seq, "%3d %3d ", entry->vcc->vpi, entry->vcc->vci);
812 else
813 seq_printf(seq, " ");
814 if (entry->recv_vcc) {
815 seq_printf(seq, " %3d %3d", entry->recv_vcc->vpi,
816 entry->recv_vcc->vci);
817 }
818 seq_putc(seq, '\n');
819 }
820
821 struct lec_state {
822 unsigned long flags;
823 struct lec_priv *locked;
824 struct hlist_node *node;
825 struct net_device *dev;
826 int itf;
827 int arp_table;
828 int misc_table;
829 };
830
lec_tbl_walk(struct lec_state * state,struct hlist_head * tbl,loff_t * l)831 static void *lec_tbl_walk(struct lec_state *state, struct hlist_head *tbl,
832 loff_t *l)
833 {
834 struct hlist_node *e = state->node;
835
836 if (!e)
837 e = tbl->first;
838 if (e == SEQ_START_TOKEN) {
839 e = tbl->first;
840 --*l;
841 }
842
843 for (; e; e = e->next) {
844 if (--*l < 0)
845 break;
846 }
847 state->node = e;
848
849 return (*l < 0) ? state : NULL;
850 }
851
lec_arp_walk(struct lec_state * state,loff_t * l,struct lec_priv * priv)852 static void *lec_arp_walk(struct lec_state *state, loff_t *l,
853 struct lec_priv *priv)
854 {
855 void *v = NULL;
856 int p;
857
858 for (p = state->arp_table; p < LEC_ARP_TABLE_SIZE; p++) {
859 v = lec_tbl_walk(state, &priv->lec_arp_tables[p], l);
860 if (v)
861 break;
862 }
863 state->arp_table = p;
864 return v;
865 }
866
lec_misc_walk(struct lec_state * state,loff_t * l,struct lec_priv * priv)867 static void *lec_misc_walk(struct lec_state *state, loff_t *l,
868 struct lec_priv *priv)
869 {
870 struct hlist_head *lec_misc_tables[] = {
871 &priv->lec_arp_empty_ones,
872 &priv->lec_no_forward,
873 &priv->mcast_fwds
874 };
875 void *v = NULL;
876 int q;
877
878 for (q = state->misc_table; q < ARRAY_SIZE(lec_misc_tables); q++) {
879 v = lec_tbl_walk(state, lec_misc_tables[q], l);
880 if (v)
881 break;
882 }
883 state->misc_table = q;
884 return v;
885 }
886
lec_priv_walk(struct lec_state * state,loff_t * l,struct lec_priv * priv)887 static void *lec_priv_walk(struct lec_state *state, loff_t *l,
888 struct lec_priv *priv)
889 {
890 if (!state->locked) {
891 state->locked = priv;
892 spin_lock_irqsave(&priv->lec_arp_lock, state->flags);
893 }
894 if (!lec_arp_walk(state, l, priv) && !lec_misc_walk(state, l, priv)) {
895 spin_unlock_irqrestore(&priv->lec_arp_lock, state->flags);
896 state->locked = NULL;
897 /* Partial state reset for the next time we get called */
898 state->arp_table = state->misc_table = 0;
899 }
900 return state->locked;
901 }
902
lec_itf_walk(struct lec_state * state,loff_t * l)903 static void *lec_itf_walk(struct lec_state *state, loff_t *l)
904 {
905 struct net_device *dev;
906 void *v;
907
908 dev = state->dev ? state->dev : dev_lec[state->itf];
909 v = (dev && netdev_priv(dev)) ?
910 lec_priv_walk(state, l, netdev_priv(dev)) : NULL;
911 if (!v && dev) {
912 /* Partial state reset for the next time we get called */
913 dev = NULL;
914 }
915 state->dev = dev;
916 return v;
917 }
918
lec_get_idx(struct lec_state * state,loff_t l)919 static void *lec_get_idx(struct lec_state *state, loff_t l)
920 {
921 void *v = NULL;
922
923 for (; state->itf < MAX_LEC_ITF; state->itf++) {
924 v = lec_itf_walk(state, &l);
925 if (v)
926 break;
927 }
928 return v;
929 }
930
lec_seq_start(struct seq_file * seq,loff_t * pos)931 static void *lec_seq_start(struct seq_file *seq, loff_t *pos)
932 {
933 struct lec_state *state = seq->private;
934
935 mutex_lock(&lec_mutex);
936 state->itf = 0;
937 state->dev = NULL;
938 state->locked = NULL;
939 state->arp_table = 0;
940 state->misc_table = 0;
941 state->node = SEQ_START_TOKEN;
942
943 return *pos ? lec_get_idx(state, *pos) : SEQ_START_TOKEN;
944 }
945
lec_seq_stop(struct seq_file * seq,void * v)946 static void lec_seq_stop(struct seq_file *seq, void *v)
947 {
948 struct lec_state *state = seq->private;
949
950 if (state->dev) {
951 spin_unlock_irqrestore(&state->locked->lec_arp_lock,
952 state->flags);
953 state->dev = NULL;
954 }
955 mutex_unlock(&lec_mutex);
956 }
957
lec_seq_next(struct seq_file * seq,void * v,loff_t * pos)958 static void *lec_seq_next(struct seq_file *seq, void *v, loff_t *pos)
959 {
960 struct lec_state *state = seq->private;
961
962 ++*pos;
963 return lec_get_idx(state, 1);
964 }
965
lec_seq_show(struct seq_file * seq,void * v)966 static int lec_seq_show(struct seq_file *seq, void *v)
967 {
968 static const char lec_banner[] =
969 "Itf MAC ATM destination"
970 " Status Flags "
971 "VPI/VCI Recv VPI/VCI\n";
972
973 if (v == SEQ_START_TOKEN)
974 seq_puts(seq, lec_banner);
975 else {
976 struct lec_state *state = seq->private;
977 struct net_device *dev = state->dev;
978 struct lec_arp_table *entry = hlist_entry(state->node,
979 struct lec_arp_table,
980 next);
981
982 seq_printf(seq, "%s ", dev->name);
983 lec_info(seq, entry);
984 }
985 return 0;
986 }
987
988 static const struct seq_operations lec_seq_ops = {
989 .start = lec_seq_start,
990 .next = lec_seq_next,
991 .stop = lec_seq_stop,
992 .show = lec_seq_show,
993 };
994 #endif
995
lane_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)996 static int lane_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
997 {
998 struct atm_vcc *vcc = ATM_SD(sock);
999 int err = 0;
1000
1001 switch (cmd) {
1002 case ATMLEC_CTRL:
1003 case ATMLEC_MCAST:
1004 case ATMLEC_DATA:
1005 if (!capable(CAP_NET_ADMIN))
1006 return -EPERM;
1007 break;
1008 default:
1009 return -ENOIOCTLCMD;
1010 }
1011
1012 mutex_lock(&lec_mutex);
1013 switch (cmd) {
1014 case ATMLEC_CTRL:
1015 err = lecd_attach(vcc, (int)arg);
1016 if (err >= 0)
1017 sock->state = SS_CONNECTED;
1018 break;
1019 case ATMLEC_MCAST:
1020 err = lec_mcast_attach(vcc, (int)arg);
1021 break;
1022 case ATMLEC_DATA:
1023 err = lec_vcc_attach(vcc, (void __user *)arg);
1024 break;
1025 }
1026
1027 mutex_unlock(&lec_mutex);
1028 return err;
1029 }
1030
1031 static struct atm_ioctl lane_ioctl_ops = {
1032 .owner = THIS_MODULE,
1033 .ioctl = lane_ioctl,
1034 };
1035
lane_module_init(void)1036 static int __init lane_module_init(void)
1037 {
1038 #ifdef CONFIG_PROC_FS
1039 struct proc_dir_entry *p;
1040
1041 p = proc_create_seq_private("lec", 0444, atm_proc_root, &lec_seq_ops,
1042 sizeof(struct lec_state), NULL);
1043 if (!p) {
1044 pr_err("Unable to initialize /proc/net/atm/lec\n");
1045 return -ENOMEM;
1046 }
1047 #endif
1048
1049 register_atm_ioctl(&lane_ioctl_ops);
1050 pr_info("lec.c: initialized\n");
1051 return 0;
1052 }
1053
lane_module_cleanup(void)1054 static void __exit lane_module_cleanup(void)
1055 {
1056 int i;
1057
1058 #ifdef CONFIG_PROC_FS
1059 remove_proc_entry("lec", atm_proc_root);
1060 #endif
1061
1062 deregister_atm_ioctl(&lane_ioctl_ops);
1063
1064 for (i = 0; i < MAX_LEC_ITF; i++) {
1065 if (dev_lec[i] != NULL) {
1066 unregister_netdev(dev_lec[i]);
1067 free_netdev(dev_lec[i]);
1068 dev_lec[i] = NULL;
1069 }
1070 }
1071 }
1072
1073 module_init(lane_module_init);
1074 module_exit(lane_module_cleanup);
1075
1076 /*
1077 * LANE2: 3.1.3, LE_RESOLVE.request
1078 * Non force allocates memory and fills in *tlvs, fills in *sizeoftlvs.
1079 * If sizeoftlvs == NULL the default TLVs associated with this
1080 * lec will be used.
1081 * If dst_mac == NULL, targetless LE_ARP will be sent
1082 */
lane2_resolve(struct net_device * dev,const u8 * dst_mac,int force,u8 ** tlvs,u32 * sizeoftlvs)1083 static int lane2_resolve(struct net_device *dev, const u8 *dst_mac, int force,
1084 u8 **tlvs, u32 *sizeoftlvs)
1085 {
1086 unsigned long flags;
1087 struct lec_priv *priv = netdev_priv(dev);
1088 struct lec_arp_table *table;
1089 struct sk_buff *skb;
1090 int retval;
1091
1092 if (force == 0) {
1093 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1094 table = lec_arp_find(priv, dst_mac);
1095 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1096 if (table == NULL)
1097 return -1;
1098
1099 *tlvs = kmemdup(table->tlvs, table->sizeoftlvs, GFP_ATOMIC);
1100 if (*tlvs == NULL)
1101 return -1;
1102
1103 *sizeoftlvs = table->sizeoftlvs;
1104
1105 return 0;
1106 }
1107
1108 if (sizeoftlvs == NULL)
1109 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, NULL);
1110
1111 else {
1112 skb = alloc_skb(*sizeoftlvs, GFP_ATOMIC);
1113 if (skb == NULL)
1114 return -1;
1115 skb->len = *sizeoftlvs;
1116 skb_copy_to_linear_data(skb, *tlvs, *sizeoftlvs);
1117 retval = send_to_lecd(priv, l_arp_xmt, dst_mac, NULL, skb);
1118 }
1119 return retval;
1120 }
1121
1122 /*
1123 * LANE2: 3.1.4, LE_ASSOCIATE.request
1124 * Associate the *tlvs with the *lan_dst address.
1125 * Will overwrite any previous association
1126 * Returns 1 for success, 0 for failure (out of memory)
1127 *
1128 */
lane2_associate_req(struct net_device * dev,const u8 * lan_dst,const u8 * tlvs,u32 sizeoftlvs)1129 static int lane2_associate_req(struct net_device *dev, const u8 *lan_dst,
1130 const u8 *tlvs, u32 sizeoftlvs)
1131 {
1132 int retval;
1133 struct sk_buff *skb;
1134 struct lec_priv *priv = netdev_priv(dev);
1135
1136 if (!ether_addr_equal(lan_dst, dev->dev_addr))
1137 return 0; /* not our mac address */
1138
1139 kfree(priv->tlvs); /* NULL if there was no previous association */
1140
1141 priv->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1142 if (priv->tlvs == NULL)
1143 return 0;
1144 priv->sizeoftlvs = sizeoftlvs;
1145
1146 skb = alloc_skb(sizeoftlvs, GFP_ATOMIC);
1147 if (skb == NULL)
1148 return 0;
1149 skb->len = sizeoftlvs;
1150 skb_copy_to_linear_data(skb, tlvs, sizeoftlvs);
1151 retval = send_to_lecd(priv, l_associate_req, NULL, NULL, skb);
1152 if (retval != 0)
1153 pr_info("lec.c: lane2_associate_req() failed\n");
1154 /*
1155 * If the previous association has changed we must
1156 * somehow notify other LANE entities about the change
1157 */
1158 return 1;
1159 }
1160
1161 /*
1162 * LANE2: 3.1.5, LE_ASSOCIATE.indication
1163 *
1164 */
lane2_associate_ind(struct net_device * dev,const u8 * mac_addr,const u8 * tlvs,u32 sizeoftlvs)1165 static void lane2_associate_ind(struct net_device *dev, const u8 *mac_addr,
1166 const u8 *tlvs, u32 sizeoftlvs)
1167 {
1168 #if 0
1169 int i = 0;
1170 #endif
1171 struct lec_priv *priv = netdev_priv(dev);
1172 #if 0 /*
1173 * Why have the TLVs in LE_ARP entries
1174 * since we do not use them? When you
1175 * uncomment this code, make sure the
1176 * TLVs get freed when entry is killed
1177 */
1178 struct lec_arp_table *entry = lec_arp_find(priv, mac_addr);
1179
1180 if (entry == NULL)
1181 return; /* should not happen */
1182
1183 kfree(entry->tlvs);
1184
1185 entry->tlvs = kmemdup(tlvs, sizeoftlvs, GFP_KERNEL);
1186 if (entry->tlvs == NULL)
1187 return;
1188 entry->sizeoftlvs = sizeoftlvs;
1189 #endif
1190 #if 0
1191 pr_info("\n");
1192 pr_info("dump of tlvs, sizeoftlvs=%d\n", sizeoftlvs);
1193 while (i < sizeoftlvs)
1194 pr_cont("%02x ", tlvs[i++]);
1195
1196 pr_cont("\n");
1197 #endif
1198
1199 /* tell MPOA about the TLVs we saw */
1200 if (priv->lane2_ops && priv->lane2_ops->associate_indicator) {
1201 priv->lane2_ops->associate_indicator(dev, mac_addr,
1202 tlvs, sizeoftlvs);
1203 }
1204 }
1205
1206 /*
1207 * Here starts what used to lec_arpc.c
1208 *
1209 * lec_arpc.c was added here when making
1210 * lane client modular. October 1997
1211 */
1212
1213 #include <linux/types.h>
1214 #include <linux/timer.h>
1215 #include <linux/param.h>
1216 #include <linux/atomic.h>
1217 #include <linux/inetdevice.h>
1218 #include <net/route.h>
1219
1220 #if 0
1221 #define pr_debug(format, args...)
1222 /*
1223 #define pr_debug printk
1224 */
1225 #endif
1226 #define DEBUG_ARP_TABLE 0
1227
1228 #define LEC_ARP_REFRESH_INTERVAL (3*HZ)
1229
1230 static void lec_arp_check_expire(struct work_struct *work);
1231 static void lec_arp_expire_arp(struct timer_list *t);
1232
1233 /*
1234 * Arp table funcs
1235 */
1236
1237 #define HASH(ch) (ch & (LEC_ARP_TABLE_SIZE - 1))
1238
1239 /*
1240 * Initialization of arp-cache
1241 */
lec_arp_init(struct lec_priv * priv)1242 static void lec_arp_init(struct lec_priv *priv)
1243 {
1244 unsigned short i;
1245
1246 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
1247 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1248 INIT_HLIST_HEAD(&priv->lec_arp_empty_ones);
1249 INIT_HLIST_HEAD(&priv->lec_no_forward);
1250 INIT_HLIST_HEAD(&priv->mcast_fwds);
1251 spin_lock_init(&priv->lec_arp_lock);
1252 INIT_DELAYED_WORK(&priv->lec_arp_work, lec_arp_check_expire);
1253 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1254 }
1255
lec_arp_clear_vccs(struct lec_arp_table * entry)1256 static void lec_arp_clear_vccs(struct lec_arp_table *entry)
1257 {
1258 if (entry->vcc) {
1259 struct atm_vcc *vcc = entry->vcc;
1260 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1261 struct net_device *dev = (struct net_device *)vcc->proto_data;
1262
1263 vcc->pop = vpriv->old_pop;
1264 if (vpriv->xoff)
1265 netif_wake_queue(dev);
1266 kfree(vpriv);
1267 vcc->user_back = NULL;
1268 vcc->push = entry->old_push;
1269 vcc_release_async(vcc, -EPIPE);
1270 entry->vcc = NULL;
1271 }
1272 if (entry->recv_vcc) {
1273 struct atm_vcc *vcc = entry->recv_vcc;
1274 struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
1275
1276 kfree(vpriv);
1277 vcc->user_back = NULL;
1278
1279 entry->recv_vcc->push = entry->old_recv_push;
1280 vcc_release_async(entry->recv_vcc, -EPIPE);
1281 entry->recv_vcc = NULL;
1282 }
1283 }
1284
1285 /*
1286 * Insert entry to lec_arp_table
1287 * LANE2: Add to the end of the list to satisfy 8.1.13
1288 */
1289 static inline void
lec_arp_add(struct lec_priv * priv,struct lec_arp_table * entry)1290 lec_arp_add(struct lec_priv *priv, struct lec_arp_table *entry)
1291 {
1292 struct hlist_head *tmp;
1293
1294 tmp = &priv->lec_arp_tables[HASH(entry->mac_addr[ETH_ALEN - 1])];
1295 hlist_add_head(&entry->next, tmp);
1296
1297 pr_debug("Added entry:%pM\n", entry->mac_addr);
1298 }
1299
1300 /*
1301 * Remove entry from lec_arp_table
1302 */
1303 static int
lec_arp_remove(struct lec_priv * priv,struct lec_arp_table * to_remove)1304 lec_arp_remove(struct lec_priv *priv, struct lec_arp_table *to_remove)
1305 {
1306 struct lec_arp_table *entry;
1307 int i, remove_vcc = 1;
1308
1309 if (!to_remove)
1310 return -1;
1311
1312 hlist_del(&to_remove->next);
1313 timer_delete(&to_remove->timer);
1314
1315 /*
1316 * If this is the only MAC connected to this VCC,
1317 * also tear down the VCC
1318 */
1319 if (to_remove->status >= ESI_FLUSH_PENDING) {
1320 /*
1321 * ESI_FLUSH_PENDING, ESI_FORWARD_DIRECT
1322 */
1323 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1324 hlist_for_each_entry(entry,
1325 &priv->lec_arp_tables[i], next) {
1326 if (memcmp(to_remove->atm_addr,
1327 entry->atm_addr, ATM_ESA_LEN) == 0) {
1328 remove_vcc = 0;
1329 break;
1330 }
1331 }
1332 }
1333 if (remove_vcc)
1334 lec_arp_clear_vccs(to_remove);
1335 }
1336 skb_queue_purge(&to_remove->tx_wait); /* FIXME: good place for this? */
1337
1338 pr_debug("Removed entry:%pM\n", to_remove->mac_addr);
1339 return 0;
1340 }
1341
1342 #if DEBUG_ARP_TABLE
get_status_string(unsigned char st)1343 static const char *get_status_string(unsigned char st)
1344 {
1345 switch (st) {
1346 case ESI_UNKNOWN:
1347 return "ESI_UNKNOWN";
1348 case ESI_ARP_PENDING:
1349 return "ESI_ARP_PENDING";
1350 case ESI_VC_PENDING:
1351 return "ESI_VC_PENDING";
1352 case ESI_FLUSH_PENDING:
1353 return "ESI_FLUSH_PENDING";
1354 case ESI_FORWARD_DIRECT:
1355 return "ESI_FORWARD_DIRECT";
1356 }
1357 return "<UNKNOWN>";
1358 }
1359
dump_arp_table(struct lec_priv * priv)1360 static void dump_arp_table(struct lec_priv *priv)
1361 {
1362 struct lec_arp_table *rulla;
1363 char buf[256];
1364 int i, offset;
1365
1366 pr_info("Dump %p:\n", priv);
1367 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1368 hlist_for_each_entry(rulla,
1369 &priv->lec_arp_tables[i], next) {
1370 offset = 0;
1371 offset += sprintf(buf, "%d: %p\n", i, rulla);
1372 offset += sprintf(buf + offset, "Mac: %pM ",
1373 rulla->mac_addr);
1374 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1375 rulla->atm_addr);
1376 offset += sprintf(buf + offset,
1377 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1378 rulla->vcc ? rulla->vcc->vpi : 0,
1379 rulla->vcc ? rulla->vcc->vci : 0,
1380 rulla->recv_vcc ? rulla->recv_vcc->
1381 vpi : 0,
1382 rulla->recv_vcc ? rulla->recv_vcc->
1383 vci : 0, rulla->last_used,
1384 rulla->timestamp, rulla->no_tries);
1385 offset +=
1386 sprintf(buf + offset,
1387 "Flags:%x, Packets_flooded:%x, Status: %s ",
1388 rulla->flags, rulla->packets_flooded,
1389 get_status_string(rulla->status));
1390 pr_info("%s\n", buf);
1391 }
1392 }
1393
1394 if (!hlist_empty(&priv->lec_no_forward))
1395 pr_info("No forward\n");
1396 hlist_for_each_entry(rulla, &priv->lec_no_forward, next) {
1397 offset = 0;
1398 offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1399 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1400 rulla->atm_addr);
1401 offset += sprintf(buf + offset,
1402 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1403 rulla->vcc ? rulla->vcc->vpi : 0,
1404 rulla->vcc ? rulla->vcc->vci : 0,
1405 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1406 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1407 rulla->last_used,
1408 rulla->timestamp, rulla->no_tries);
1409 offset += sprintf(buf + offset,
1410 "Flags:%x, Packets_flooded:%x, Status: %s ",
1411 rulla->flags, rulla->packets_flooded,
1412 get_status_string(rulla->status));
1413 pr_info("%s\n", buf);
1414 }
1415
1416 if (!hlist_empty(&priv->lec_arp_empty_ones))
1417 pr_info("Empty ones\n");
1418 hlist_for_each_entry(rulla, &priv->lec_arp_empty_ones, next) {
1419 offset = 0;
1420 offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1421 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1422 rulla->atm_addr);
1423 offset += sprintf(buf + offset,
1424 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1425 rulla->vcc ? rulla->vcc->vpi : 0,
1426 rulla->vcc ? rulla->vcc->vci : 0,
1427 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1428 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1429 rulla->last_used,
1430 rulla->timestamp, rulla->no_tries);
1431 offset += sprintf(buf + offset,
1432 "Flags:%x, Packets_flooded:%x, Status: %s ",
1433 rulla->flags, rulla->packets_flooded,
1434 get_status_string(rulla->status));
1435 pr_info("%s", buf);
1436 }
1437
1438 if (!hlist_empty(&priv->mcast_fwds))
1439 pr_info("Multicast Forward VCCs\n");
1440 hlist_for_each_entry(rulla, &priv->mcast_fwds, next) {
1441 offset = 0;
1442 offset += sprintf(buf + offset, "Mac: %pM ", rulla->mac_addr);
1443 offset += sprintf(buf + offset, "Atm: %*ph ", ATM_ESA_LEN,
1444 rulla->atm_addr);
1445 offset += sprintf(buf + offset,
1446 "Vcc vpi:%d vci:%d, Recv_vcc vpi:%d vci:%d Last_used:%lx, Timestamp:%lx, No_tries:%d ",
1447 rulla->vcc ? rulla->vcc->vpi : 0,
1448 rulla->vcc ? rulla->vcc->vci : 0,
1449 rulla->recv_vcc ? rulla->recv_vcc->vpi : 0,
1450 rulla->recv_vcc ? rulla->recv_vcc->vci : 0,
1451 rulla->last_used,
1452 rulla->timestamp, rulla->no_tries);
1453 offset += sprintf(buf + offset,
1454 "Flags:%x, Packets_flooded:%x, Status: %s ",
1455 rulla->flags, rulla->packets_flooded,
1456 get_status_string(rulla->status));
1457 pr_info("%s\n", buf);
1458 }
1459
1460 }
1461 #else
1462 #define dump_arp_table(priv) do { } while (0)
1463 #endif
1464
1465 /*
1466 * Destruction of arp-cache
1467 */
lec_arp_destroy(struct lec_priv * priv)1468 static void lec_arp_destroy(struct lec_priv *priv)
1469 {
1470 unsigned long flags;
1471 struct hlist_node *next;
1472 struct lec_arp_table *entry;
1473 int i;
1474
1475 cancel_delayed_work_sync(&priv->lec_arp_work);
1476
1477 /*
1478 * Remove all entries
1479 */
1480
1481 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1482 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1483 hlist_for_each_entry_safe(entry, next,
1484 &priv->lec_arp_tables[i], next) {
1485 lec_arp_remove(priv, entry);
1486 lec_arp_put(entry);
1487 }
1488 INIT_HLIST_HEAD(&priv->lec_arp_tables[i]);
1489 }
1490
1491 hlist_for_each_entry_safe(entry, next,
1492 &priv->lec_arp_empty_ones, next) {
1493 timer_delete_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_arp_empty_ones);
1499
1500 hlist_for_each_entry_safe(entry, next,
1501 &priv->lec_no_forward, next) {
1502 timer_delete_sync(&entry->timer);
1503 lec_arp_clear_vccs(entry);
1504 hlist_del(&entry->next);
1505 lec_arp_put(entry);
1506 }
1507 INIT_HLIST_HEAD(&priv->lec_no_forward);
1508
1509 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
1510 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
1511 lec_arp_clear_vccs(entry);
1512 hlist_del(&entry->next);
1513 lec_arp_put(entry);
1514 }
1515 INIT_HLIST_HEAD(&priv->mcast_fwds);
1516 priv->mcast_vcc = NULL;
1517 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1518 }
1519
1520 /*
1521 * Find entry by mac_address
1522 */
lec_arp_find(struct lec_priv * priv,const unsigned char * mac_addr)1523 static struct lec_arp_table *lec_arp_find(struct lec_priv *priv,
1524 const unsigned char *mac_addr)
1525 {
1526 struct hlist_head *head;
1527 struct lec_arp_table *entry;
1528
1529 pr_debug("%pM\n", mac_addr);
1530
1531 head = &priv->lec_arp_tables[HASH(mac_addr[ETH_ALEN - 1])];
1532 hlist_for_each_entry(entry, head, next) {
1533 if (ether_addr_equal(mac_addr, entry->mac_addr))
1534 return entry;
1535 }
1536 return NULL;
1537 }
1538
make_entry(struct lec_priv * priv,const unsigned char * mac_addr)1539 static struct lec_arp_table *make_entry(struct lec_priv *priv,
1540 const unsigned char *mac_addr)
1541 {
1542 struct lec_arp_table *to_return;
1543
1544 to_return = kzalloc(sizeof(struct lec_arp_table), GFP_ATOMIC);
1545 if (!to_return)
1546 return NULL;
1547 ether_addr_copy(to_return->mac_addr, mac_addr);
1548 INIT_HLIST_NODE(&to_return->next);
1549 timer_setup(&to_return->timer, lec_arp_expire_arp, 0);
1550 to_return->last_used = jiffies;
1551 to_return->priv = priv;
1552 skb_queue_head_init(&to_return->tx_wait);
1553 refcount_set(&to_return->usage, 1);
1554 return to_return;
1555 }
1556
1557 /* Arp sent timer expired */
lec_arp_expire_arp(struct timer_list * t)1558 static void lec_arp_expire_arp(struct timer_list *t)
1559 {
1560 struct lec_arp_table *entry;
1561
1562 entry = timer_container_of(entry, t, timer);
1563
1564 pr_debug("\n");
1565 if (entry->status == ESI_ARP_PENDING) {
1566 if (entry->no_tries <= entry->priv->max_retry_count) {
1567 if (entry->is_rdesc)
1568 send_to_lecd(entry->priv, l_rdesc_arp_xmt,
1569 entry->mac_addr, NULL, NULL);
1570 else
1571 send_to_lecd(entry->priv, l_arp_xmt,
1572 entry->mac_addr, NULL, NULL);
1573 entry->no_tries++;
1574 }
1575 mod_timer(&entry->timer, jiffies + (1 * HZ));
1576 }
1577 }
1578
1579 /* Unknown/unused vcc expire, remove associated entry */
lec_arp_expire_vcc(struct timer_list * t)1580 static void lec_arp_expire_vcc(struct timer_list *t)
1581 {
1582 unsigned long flags;
1583 struct lec_arp_table *to_remove = timer_container_of(to_remove, t,
1584 timer);
1585 struct lec_priv *priv = to_remove->priv;
1586
1587 timer_delete(&to_remove->timer);
1588
1589 pr_debug("%p %p: vpi:%d vci:%d\n",
1590 to_remove, priv,
1591 to_remove->vcc ? to_remove->recv_vcc->vpi : 0,
1592 to_remove->vcc ? to_remove->recv_vcc->vci : 0);
1593
1594 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1595 hlist_del(&to_remove->next);
1596 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1597
1598 lec_arp_clear_vccs(to_remove);
1599 lec_arp_put(to_remove);
1600 }
1601
__lec_arp_check_expire(struct lec_arp_table * entry,unsigned long now,struct lec_priv * priv)1602 static bool __lec_arp_check_expire(struct lec_arp_table *entry,
1603 unsigned long now,
1604 struct lec_priv *priv)
1605 {
1606 unsigned long time_to_check;
1607
1608 if ((entry->flags) & LEC_REMOTE_FLAG && priv->topology_change)
1609 time_to_check = priv->forward_delay_time;
1610 else
1611 time_to_check = priv->aging_time;
1612
1613 pr_debug("About to expire: %lx - %lx > %lx\n",
1614 now, entry->last_used, time_to_check);
1615 if (time_after(now, entry->last_used + time_to_check) &&
1616 !(entry->flags & LEC_PERMANENT_FLAG) &&
1617 !(entry->mac_addr[0] & 0x01)) { /* LANE2: 7.1.20 */
1618 /* Remove entry */
1619 pr_debug("Entry timed out\n");
1620 lec_arp_remove(priv, entry);
1621 lec_arp_put(entry);
1622 } else {
1623 /* Something else */
1624 if ((entry->status == ESI_VC_PENDING ||
1625 entry->status == ESI_ARP_PENDING) &&
1626 time_after_eq(now, entry->timestamp +
1627 priv->max_unknown_frame_time)) {
1628 entry->timestamp = jiffies;
1629 entry->packets_flooded = 0;
1630 if (entry->status == ESI_VC_PENDING)
1631 send_to_lecd(priv, l_svc_setup,
1632 entry->mac_addr,
1633 entry->atm_addr,
1634 NULL);
1635 }
1636 if (entry->status == ESI_FLUSH_PENDING &&
1637 time_after_eq(now, entry->timestamp +
1638 priv->path_switching_delay)) {
1639 lec_arp_hold(entry);
1640 return true;
1641 }
1642 }
1643
1644 return false;
1645 }
1646 /*
1647 * Expire entries.
1648 * 1. Re-set timer
1649 * 2. For each entry, delete entries that have aged past the age limit.
1650 * 3. For each entry, depending on the status of the entry, perform
1651 * the following maintenance.
1652 * a. If status is ESI_VC_PENDING or ESI_ARP_PENDING then if the
1653 * tick_count is above the max_unknown_frame_time, clear
1654 * the tick_count to zero and clear the packets_flooded counter
1655 * to zero. This supports the packet rate limit per address
1656 * while flooding unknowns.
1657 * b. If the status is ESI_FLUSH_PENDING and the tick_count is greater
1658 * than or equal to the path_switching_delay, change the status
1659 * to ESI_FORWARD_DIRECT. This causes the flush period to end
1660 * regardless of the progress of the flush protocol.
1661 */
lec_arp_check_expire(struct work_struct * work)1662 static void lec_arp_check_expire(struct work_struct *work)
1663 {
1664 unsigned long flags;
1665 struct lec_priv *priv =
1666 container_of(work, struct lec_priv, lec_arp_work.work);
1667 struct hlist_node *next;
1668 struct lec_arp_table *entry;
1669 unsigned long now;
1670 int i;
1671
1672 pr_debug("%p\n", priv);
1673 now = jiffies;
1674 restart:
1675 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1676 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1677 hlist_for_each_entry_safe(entry, next,
1678 &priv->lec_arp_tables[i], next) {
1679 if (__lec_arp_check_expire(entry, now, priv)) {
1680 struct sk_buff *skb;
1681 struct atm_vcc *vcc = entry->vcc;
1682
1683 spin_unlock_irqrestore(&priv->lec_arp_lock,
1684 flags);
1685 while ((skb = skb_dequeue(&entry->tx_wait)))
1686 lec_send(vcc, skb);
1687 entry->last_used = jiffies;
1688 entry->status = ESI_FORWARD_DIRECT;
1689 lec_arp_put(entry);
1690
1691 goto restart;
1692 }
1693 }
1694 }
1695 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1696
1697 schedule_delayed_work(&priv->lec_arp_work, LEC_ARP_REFRESH_INTERVAL);
1698 }
1699
1700 /*
1701 * Try to find vcc where mac_address is attached.
1702 *
1703 */
lec_arp_resolve(struct lec_priv * priv,const unsigned char * mac_to_find,int is_rdesc,struct lec_arp_table ** ret_entry)1704 static struct atm_vcc *lec_arp_resolve(struct lec_priv *priv,
1705 const unsigned char *mac_to_find,
1706 int is_rdesc,
1707 struct lec_arp_table **ret_entry)
1708 {
1709 unsigned long flags;
1710 struct lec_arp_table *entry;
1711 struct atm_vcc *found;
1712
1713 if (mac_to_find[0] & 0x01) {
1714 switch (priv->lane_version) {
1715 case 1:
1716 return priv->mcast_vcc;
1717 case 2: /* LANE2 wants arp for multicast addresses */
1718 if (ether_addr_equal(mac_to_find, bus_mac))
1719 return priv->mcast_vcc;
1720 break;
1721 default:
1722 break;
1723 }
1724 }
1725
1726 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1727 entry = lec_arp_find(priv, mac_to_find);
1728
1729 if (entry) {
1730 if (entry->status == ESI_FORWARD_DIRECT) {
1731 /* Connection Ok */
1732 entry->last_used = jiffies;
1733 lec_arp_hold(entry);
1734 *ret_entry = entry;
1735 found = entry->vcc;
1736 goto out;
1737 }
1738 /*
1739 * If the LE_ARP cache entry is still pending, reset count to 0
1740 * so another LE_ARP request can be made for this frame.
1741 */
1742 if (entry->status == ESI_ARP_PENDING)
1743 entry->no_tries = 0;
1744 /*
1745 * Data direct VC not yet set up, check to see if the unknown
1746 * frame count is greater than the limit. If the limit has
1747 * not been reached, allow the caller to send packet to
1748 * BUS.
1749 */
1750 if (entry->status != ESI_FLUSH_PENDING &&
1751 entry->packets_flooded <
1752 priv->maximum_unknown_frame_count) {
1753 entry->packets_flooded++;
1754 pr_debug("Flooding..\n");
1755 found = priv->mcast_vcc;
1756 goto out;
1757 }
1758 /*
1759 * We got here because entry->status == ESI_FLUSH_PENDING
1760 * or BUS flood limit was reached for an entry which is
1761 * in ESI_ARP_PENDING or ESI_VC_PENDING state.
1762 */
1763 lec_arp_hold(entry);
1764 *ret_entry = entry;
1765 pr_debug("entry->status %d entry->vcc %p\n", entry->status,
1766 entry->vcc);
1767 found = NULL;
1768 } else {
1769 /* No matching entry was found */
1770 entry = make_entry(priv, mac_to_find);
1771 pr_debug("Making entry\n");
1772 if (!entry) {
1773 found = priv->mcast_vcc;
1774 goto out;
1775 }
1776 lec_arp_add(priv, entry);
1777 /* We want arp-request(s) to be sent */
1778 entry->packets_flooded = 1;
1779 entry->status = ESI_ARP_PENDING;
1780 entry->no_tries = 1;
1781 entry->last_used = entry->timestamp = jiffies;
1782 entry->is_rdesc = is_rdesc;
1783 if (entry->is_rdesc)
1784 send_to_lecd(priv, l_rdesc_arp_xmt, mac_to_find, NULL,
1785 NULL);
1786 else
1787 send_to_lecd(priv, l_arp_xmt, mac_to_find, NULL, NULL);
1788 entry->timer.expires = jiffies + (1 * HZ);
1789 entry->timer.function = lec_arp_expire_arp;
1790 add_timer(&entry->timer);
1791 found = priv->mcast_vcc;
1792 }
1793
1794 out:
1795 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1796 return found;
1797 }
1798
1799 static int
lec_addr_delete(struct lec_priv * priv,const unsigned char * atm_addr,unsigned long permanent)1800 lec_addr_delete(struct lec_priv *priv, const unsigned char *atm_addr,
1801 unsigned long permanent)
1802 {
1803 unsigned long flags;
1804 struct hlist_node *next;
1805 struct lec_arp_table *entry;
1806 int i;
1807
1808 pr_debug("\n");
1809 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1810 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1811 hlist_for_each_entry_safe(entry, next,
1812 &priv->lec_arp_tables[i], next) {
1813 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN) &&
1814 (permanent ||
1815 !(entry->flags & LEC_PERMANENT_FLAG))) {
1816 lec_arp_remove(priv, entry);
1817 lec_arp_put(entry);
1818 }
1819 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1820 return 0;
1821 }
1822 }
1823 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1824 return -1;
1825 }
1826
1827 /*
1828 * Notifies: Response to arp_request (atm_addr != NULL)
1829 */
1830 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)1831 lec_arp_update(struct lec_priv *priv, const unsigned char *mac_addr,
1832 const unsigned char *atm_addr, unsigned long remoteflag,
1833 unsigned int targetless_le_arp)
1834 {
1835 unsigned long flags;
1836 struct hlist_node *next;
1837 struct lec_arp_table *entry, *tmp;
1838 int i;
1839
1840 pr_debug("%smac:%pM\n",
1841 (targetless_le_arp) ? "targetless " : "", mac_addr);
1842
1843 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1844 entry = lec_arp_find(priv, mac_addr);
1845 if (entry == NULL && targetless_le_arp)
1846 goto out; /*
1847 * LANE2: ignore targetless LE_ARPs for which
1848 * we have no entry in the cache. 7.1.30
1849 */
1850 if (!hlist_empty(&priv->lec_arp_empty_ones)) {
1851 hlist_for_each_entry_safe(entry, next,
1852 &priv->lec_arp_empty_ones, next) {
1853 if (memcmp(entry->atm_addr, atm_addr, ATM_ESA_LEN) == 0) {
1854 hlist_del(&entry->next);
1855 timer_delete(&entry->timer);
1856 tmp = lec_arp_find(priv, mac_addr);
1857 if (tmp) {
1858 timer_delete(&tmp->timer);
1859 tmp->status = ESI_FORWARD_DIRECT;
1860 memcpy(tmp->atm_addr, atm_addr, ATM_ESA_LEN);
1861 tmp->vcc = entry->vcc;
1862 tmp->old_push = entry->old_push;
1863 tmp->last_used = jiffies;
1864 timer_delete(&entry->timer);
1865 lec_arp_put(entry);
1866 entry = tmp;
1867 } else {
1868 entry->status = ESI_FORWARD_DIRECT;
1869 ether_addr_copy(entry->mac_addr,
1870 mac_addr);
1871 entry->last_used = jiffies;
1872 lec_arp_add(priv, entry);
1873 }
1874 if (remoteflag)
1875 entry->flags |= LEC_REMOTE_FLAG;
1876 else
1877 entry->flags &= ~LEC_REMOTE_FLAG;
1878 pr_debug("After update\n");
1879 dump_arp_table(priv);
1880 goto out;
1881 }
1882 }
1883 }
1884
1885 entry = lec_arp_find(priv, mac_addr);
1886 if (!entry) {
1887 entry = make_entry(priv, mac_addr);
1888 if (!entry)
1889 goto out;
1890 entry->status = ESI_UNKNOWN;
1891 lec_arp_add(priv, entry);
1892 /* Temporary, changes before end of function */
1893 }
1894 memcpy(entry->atm_addr, atm_addr, ATM_ESA_LEN);
1895 timer_delete(&entry->timer);
1896 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1897 hlist_for_each_entry(tmp,
1898 &priv->lec_arp_tables[i], next) {
1899 if (entry != tmp &&
1900 !memcmp(tmp->atm_addr, atm_addr, ATM_ESA_LEN)) {
1901 /* Vcc to this host exists */
1902 if (tmp->status > ESI_VC_PENDING) {
1903 /*
1904 * ESI_FLUSH_PENDING,
1905 * ESI_FORWARD_DIRECT
1906 */
1907 entry->vcc = tmp->vcc;
1908 entry->old_push = tmp->old_push;
1909 }
1910 entry->status = tmp->status;
1911 break;
1912 }
1913 }
1914 }
1915 if (remoteflag)
1916 entry->flags |= LEC_REMOTE_FLAG;
1917 else
1918 entry->flags &= ~LEC_REMOTE_FLAG;
1919 if (entry->status == ESI_ARP_PENDING || entry->status == ESI_UNKNOWN) {
1920 entry->status = ESI_VC_PENDING;
1921 send_to_lecd(priv, l_svc_setup, entry->mac_addr, atm_addr, NULL);
1922 }
1923 pr_debug("After update2\n");
1924 dump_arp_table(priv);
1925 out:
1926 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
1927 }
1928
1929 /*
1930 * Notifies: Vcc setup ready
1931 */
1932 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))1933 lec_vcc_added(struct lec_priv *priv, const struct atmlec_ioc *ioc_data,
1934 struct atm_vcc *vcc,
1935 void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb))
1936 {
1937 unsigned long flags;
1938 struct lec_arp_table *entry;
1939 int i, found_entry = 0;
1940
1941 spin_lock_irqsave(&priv->lec_arp_lock, flags);
1942 /* Vcc for Multicast Forward. No timer, LANEv2 7.1.20 and 2.3.5.3 */
1943 if (ioc_data->receive == 2) {
1944 pr_debug("LEC_ARP: Attaching mcast forward\n");
1945 #if 0
1946 entry = lec_arp_find(priv, bus_mac);
1947 if (!entry) {
1948 pr_info("LEC_ARP: Multicast entry not found!\n");
1949 goto out;
1950 }
1951 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1952 entry->recv_vcc = vcc;
1953 entry->old_recv_push = old_push;
1954 #endif
1955 entry = make_entry(priv, bus_mac);
1956 if (entry == NULL)
1957 goto out;
1958 timer_delete(&entry->timer);
1959 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1960 entry->recv_vcc = vcc;
1961 entry->old_recv_push = old_push;
1962 hlist_add_head(&entry->next, &priv->mcast_fwds);
1963 goto out;
1964 } else if (ioc_data->receive == 1) {
1965 /*
1966 * Vcc which we don't want to make default vcc,
1967 * attach it anyway.
1968 */
1969 pr_debug("LEC_ARP:Attaching data direct, not default: %*phN\n",
1970 ATM_ESA_LEN, ioc_data->atm_addr);
1971 entry = make_entry(priv, bus_mac);
1972 if (entry == NULL)
1973 goto out;
1974 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
1975 eth_zero_addr(entry->mac_addr);
1976 entry->recv_vcc = vcc;
1977 entry->old_recv_push = old_push;
1978 entry->status = ESI_UNKNOWN;
1979 entry->timer.expires = jiffies + priv->vcc_timeout_period;
1980 entry->timer.function = lec_arp_expire_vcc;
1981 hlist_add_head(&entry->next, &priv->lec_no_forward);
1982 add_timer(&entry->timer);
1983 dump_arp_table(priv);
1984 goto out;
1985 }
1986 pr_debug("LEC_ARP:Attaching data direct, default: %*phN\n",
1987 ATM_ESA_LEN, ioc_data->atm_addr);
1988 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
1989 hlist_for_each_entry(entry,
1990 &priv->lec_arp_tables[i], next) {
1991 if (memcmp
1992 (ioc_data->atm_addr, entry->atm_addr,
1993 ATM_ESA_LEN) == 0) {
1994 pr_debug("LEC_ARP: Attaching data direct\n");
1995 pr_debug("Currently -> Vcc: %d, Rvcc:%d\n",
1996 entry->vcc ? entry->vcc->vci : 0,
1997 entry->recv_vcc ? entry->recv_vcc->
1998 vci : 0);
1999 found_entry = 1;
2000 timer_delete(&entry->timer);
2001 entry->vcc = vcc;
2002 entry->old_push = old_push;
2003 if (entry->status == ESI_VC_PENDING) {
2004 if (priv->maximum_unknown_frame_count
2005 == 0)
2006 entry->status =
2007 ESI_FORWARD_DIRECT;
2008 else {
2009 entry->timestamp = jiffies;
2010 entry->status =
2011 ESI_FLUSH_PENDING;
2012 #if 0
2013 send_to_lecd(priv, l_flush_xmt,
2014 NULL,
2015 entry->atm_addr,
2016 NULL);
2017 #endif
2018 }
2019 } else {
2020 /*
2021 * They were forming a connection
2022 * to us, and we to them. Our
2023 * ATM address is numerically lower
2024 * than theirs, so we make connection
2025 * we formed into default VCC (8.1.11).
2026 * Connection they made gets torn
2027 * down. This might confuse some
2028 * clients. Can be changed if
2029 * someone reports trouble...
2030 */
2031 ;
2032 }
2033 }
2034 }
2035 }
2036 if (found_entry) {
2037 pr_debug("After vcc was added\n");
2038 dump_arp_table(priv);
2039 goto out;
2040 }
2041 /*
2042 * Not found, snatch address from first data packet that arrives
2043 * from this vcc
2044 */
2045 entry = make_entry(priv, bus_mac);
2046 if (!entry)
2047 goto out;
2048 entry->vcc = vcc;
2049 entry->old_push = old_push;
2050 memcpy(entry->atm_addr, ioc_data->atm_addr, ATM_ESA_LEN);
2051 eth_zero_addr(entry->mac_addr);
2052 entry->status = ESI_UNKNOWN;
2053 hlist_add_head(&entry->next, &priv->lec_arp_empty_ones);
2054 entry->timer.expires = jiffies + priv->vcc_timeout_period;
2055 entry->timer.function = lec_arp_expire_vcc;
2056 add_timer(&entry->timer);
2057 pr_debug("After vcc was added\n");
2058 dump_arp_table(priv);
2059 out:
2060 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2061 }
2062
lec_flush_complete(struct lec_priv * priv,unsigned long tran_id)2063 static void lec_flush_complete(struct lec_priv *priv, unsigned long tran_id)
2064 {
2065 unsigned long flags;
2066 struct lec_arp_table *entry;
2067 int i;
2068
2069 pr_debug("%lx\n", tran_id);
2070 restart:
2071 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2072 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2073 hlist_for_each_entry(entry,
2074 &priv->lec_arp_tables[i], next) {
2075 if (entry->flush_tran_id == tran_id &&
2076 entry->status == ESI_FLUSH_PENDING) {
2077 struct sk_buff *skb;
2078 struct atm_vcc *vcc = entry->vcc;
2079
2080 lec_arp_hold(entry);
2081 spin_unlock_irqrestore(&priv->lec_arp_lock,
2082 flags);
2083 while ((skb = skb_dequeue(&entry->tx_wait)))
2084 lec_send(vcc, skb);
2085 entry->last_used = jiffies;
2086 entry->status = ESI_FORWARD_DIRECT;
2087 lec_arp_put(entry);
2088 pr_debug("LEC_ARP: Flushed\n");
2089 goto restart;
2090 }
2091 }
2092 }
2093 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2094 dump_arp_table(priv);
2095 }
2096
2097 static void
lec_set_flush_tran_id(struct lec_priv * priv,const unsigned char * atm_addr,unsigned long tran_id)2098 lec_set_flush_tran_id(struct lec_priv *priv,
2099 const unsigned char *atm_addr, unsigned long tran_id)
2100 {
2101 unsigned long flags;
2102 struct lec_arp_table *entry;
2103 int i;
2104
2105 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2106 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++)
2107 hlist_for_each_entry(entry,
2108 &priv->lec_arp_tables[i], next) {
2109 if (!memcmp(atm_addr, entry->atm_addr, ATM_ESA_LEN)) {
2110 entry->flush_tran_id = tran_id;
2111 pr_debug("Set flush transaction id to %lx for %p\n",
2112 tran_id, entry);
2113 }
2114 }
2115 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2116 }
2117
lec_mcast_make(struct lec_priv * priv,struct atm_vcc * vcc)2118 static int lec_mcast_make(struct lec_priv *priv, struct atm_vcc *vcc)
2119 {
2120 unsigned long flags;
2121 unsigned char mac_addr[] = {
2122 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
2123 };
2124 struct lec_arp_table *to_add;
2125 struct lec_vcc_priv *vpriv;
2126 int err = 0;
2127
2128 vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL);
2129 if (!vpriv)
2130 return -ENOMEM;
2131 vpriv->xoff = 0;
2132 vpriv->old_pop = vcc->pop;
2133 vcc->user_back = vpriv;
2134 vcc->pop = lec_pop;
2135 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2136 to_add = make_entry(priv, mac_addr);
2137 if (!to_add) {
2138 vcc->pop = vpriv->old_pop;
2139 kfree(vpriv);
2140 err = -ENOMEM;
2141 goto out;
2142 }
2143 memcpy(to_add->atm_addr, vcc->remote.sas_addr.prv, ATM_ESA_LEN);
2144 to_add->status = ESI_FORWARD_DIRECT;
2145 to_add->flags |= LEC_PERMANENT_FLAG;
2146 to_add->vcc = vcc;
2147 to_add->old_push = vcc->push;
2148 vcc->push = lec_push;
2149 priv->mcast_vcc = vcc;
2150 lec_arp_add(priv, to_add);
2151 out:
2152 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2153 return err;
2154 }
2155
lec_vcc_close(struct lec_priv * priv,struct atm_vcc * vcc)2156 static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc)
2157 {
2158 unsigned long flags;
2159 struct hlist_node *next;
2160 struct lec_arp_table *entry;
2161 int i;
2162
2163 pr_debug("LEC_ARP: lec_vcc_close vpi:%d vci:%d\n", vcc->vpi, vcc->vci);
2164 dump_arp_table(priv);
2165
2166 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2167
2168 for (i = 0; i < LEC_ARP_TABLE_SIZE; i++) {
2169 hlist_for_each_entry_safe(entry, next,
2170 &priv->lec_arp_tables[i], next) {
2171 if (vcc == entry->vcc) {
2172 lec_arp_remove(priv, entry);
2173 lec_arp_put(entry);
2174 if (priv->mcast_vcc == vcc)
2175 priv->mcast_vcc = NULL;
2176 }
2177 }
2178 }
2179
2180 hlist_for_each_entry_safe(entry, next,
2181 &priv->lec_arp_empty_ones, next) {
2182 if (entry->vcc == vcc) {
2183 lec_arp_clear_vccs(entry);
2184 timer_delete(&entry->timer);
2185 hlist_del(&entry->next);
2186 lec_arp_put(entry);
2187 }
2188 }
2189
2190 hlist_for_each_entry_safe(entry, next,
2191 &priv->lec_no_forward, next) {
2192 if (entry->recv_vcc == vcc) {
2193 lec_arp_clear_vccs(entry);
2194 timer_delete(&entry->timer);
2195 hlist_del(&entry->next);
2196 lec_arp_put(entry);
2197 }
2198 }
2199
2200 hlist_for_each_entry_safe(entry, next, &priv->mcast_fwds, next) {
2201 if (entry->recv_vcc == vcc) {
2202 lec_arp_clear_vccs(entry);
2203 /* No timer, LANEv2 7.1.20 and 2.3.5.3 */
2204 hlist_del(&entry->next);
2205 lec_arp_put(entry);
2206 }
2207 }
2208
2209 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2210 dump_arp_table(priv);
2211 }
2212
2213 static void
lec_arp_check_empties(struct lec_priv * priv,struct atm_vcc * vcc,struct sk_buff * skb)2214 lec_arp_check_empties(struct lec_priv *priv,
2215 struct atm_vcc *vcc, struct sk_buff *skb)
2216 {
2217 unsigned long flags;
2218 struct hlist_node *next;
2219 struct lec_arp_table *entry, *tmp;
2220 struct lecdatahdr_8023 *hdr = (struct lecdatahdr_8023 *)skb->data;
2221 unsigned char *src = hdr->h_source;
2222
2223 spin_lock_irqsave(&priv->lec_arp_lock, flags);
2224 hlist_for_each_entry_safe(entry, next,
2225 &priv->lec_arp_empty_ones, next) {
2226 if (vcc == entry->vcc) {
2227 timer_delete(&entry->timer);
2228 ether_addr_copy(entry->mac_addr, src);
2229 entry->status = ESI_FORWARD_DIRECT;
2230 entry->last_used = jiffies;
2231 /* We might have got an entry */
2232 tmp = lec_arp_find(priv, src);
2233 if (tmp) {
2234 lec_arp_remove(priv, tmp);
2235 lec_arp_put(tmp);
2236 }
2237 hlist_del(&entry->next);
2238 lec_arp_add(priv, entry);
2239 goto out;
2240 }
2241 }
2242 pr_debug("LEC_ARP: Arp_check_empties: entry not found!\n");
2243 out:
2244 spin_unlock_irqrestore(&priv->lec_arp_lock, flags);
2245 }
2246
2247 MODULE_DESCRIPTION("ATM LAN Emulation (LANE) support");
2248 MODULE_LICENSE("GPL");
2249