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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / net / atm / mpc.c
blob195481369c9e77e7e9b843385e98b2af65257339
1 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
2
3 #include <linux/kernel.h>
4 #include <linux/string.h>
5 #include <linux/slab.h>
6 #include <linux/timer.h>
7 #include <linux/init.h>
8 #include <linux/bitops.h>
9 #include <linux/capability.h>
10 #include <linux/seq_file.h>
11
12 /* We are an ethernet device */
13 #include <linux/if_ether.h>
14 #include <linux/netdevice.h>
15 #include <linux/etherdevice.h>
16 #include <net/sock.h>
17 #include <linux/skbuff.h>
18 #include <linux/ip.h>
19 #include <linux/uaccess.h>
20 #include <asm/byteorder.h>
21 #include <net/checksum.h> /* for ip_fast_csum() */
22 #include <net/arp.h>
23 #include <net/dst.h>
24 #include <linux/proc_fs.h>
25
26 /* And atm device */
27 #include <linux/atmdev.h>
28 #include <linux/atmlec.h>
29 #include <linux/atmmpc.h>
30 /* Modular too */
31 #include <linux/module.h>
32
33 #include "lec.h"
34 #include "mpc.h"
35 #include "resources.h"
36
37 /*
38 * mpc.c: Implementation of MPOA client kernel part
39 */
40
41 #define dprintk(format, args...) \
42 do { if (0) \
43 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\
44 } while (0)
45 #define dprintk_cont(format, args...) \
46 do { if (0) printk(KERN_CONT format, ##args); } while (0)
47
48 #define ddprintk(format, args...) \
49 do { if (0) \
50 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\
51 } while (0)
52 #define ddprintk_cont(format, args...) \
53 do { if (0) printk(KERN_CONT format, ##args); } while (0)
54
55 #define MPOA_TAG_LEN 4
56
57 /* mpc_daemon -> kernel */
58 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc);
59 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
60 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
61 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
62 static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
63 static void clean_up(struct k_message *msg, struct mpoa_client *mpc,
64 int action);
65 static void MPOA_cache_impos_rcvd(struct k_message *msg,
66 struct mpoa_client *mpc);
67 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg,
68 struct mpoa_client *mpc);
69 static void set_mps_mac_addr_rcvd(struct k_message *mesg,
70 struct mpoa_client *mpc);
71
72 static const uint8_t *copy_macs(struct mpoa_client *mpc,
73 const uint8_t *router_mac,
74 const uint8_t *tlvs, uint8_t mps_macs,
75 uint8_t device_type);
76 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
77
78 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc);
79 static void mpoad_close(struct atm_vcc *vcc);
80 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
81
82 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
83 static netdev_tx_t mpc_send_packet(struct sk_buff *skb,
84 struct net_device *dev);
85 static int mpoa_event_listener(struct notifier_block *mpoa_notifier,
86 unsigned long event, void *dev);
87 static void mpc_timer_refresh(void);
88 static void mpc_cache_check(unsigned long checking_time);
89
90 static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
91 0xaa, 0xaa, 0x03,
92 {0x00, 0x00, 0x5e},
93 {0x00, 0x03} /* For MPOA control PDUs */
94 };
95 static struct llc_snap_hdr llc_snap_mpoa_data = {
96 0xaa, 0xaa, 0x03,
97 {0x00, 0x00, 0x00},
98 {0x08, 0x00} /* This is for IP PDUs only */
99 };
100 static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
101 0xaa, 0xaa, 0x03,
102 {0x00, 0x00, 0x00},
103 {0x88, 0x4c} /* This is for tagged data PDUs */
104 };
105
106 static struct notifier_block mpoa_notifier = {
107 mpoa_event_listener,
108 NULL,
109 0
110 };
111
112 struct mpoa_client *mpcs = NULL;
113 static struct atm_mpoa_qos *qos_head = NULL;
114 static DEFINE_TIMER(mpc_timer, NULL, 0, 0);
115
116
117 static struct mpoa_client *find_mpc_by_itfnum(int itf)
118 {
119 struct mpoa_client *mpc;
120
121 mpc = mpcs; /* our global linked list */
122 while (mpc != NULL) {
123 if (mpc->dev_num == itf)
124 return mpc;
125 mpc = mpc->next;
126 }
127
128 return NULL; /* not found */
129 }
130
131 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
132 {
133 struct mpoa_client *mpc;
134
135 mpc = mpcs; /* our global linked list */
136 while (mpc != NULL) {
137 if (mpc->mpoad_vcc == vcc)
138 return mpc;
139 mpc = mpc->next;
140 }
141
142 return NULL; /* not found */
143 }
144
145 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
146 {
147 struct mpoa_client *mpc;
148
149 mpc = mpcs; /* our global linked list */
150 while (mpc != NULL) {
151 if (mpc->dev == dev)
152 return mpc;
153 mpc = mpc->next;
154 }
155
156 return NULL; /* not found */
157 }
158
159 /*
160 * Functions for managing QoS list
161 */
162
163 /*
164 * Overwrites the old entry or makes a new one.
165 */
166 struct atm_mpoa_qos *atm_mpoa_add_qos(__be32 dst_ip, struct atm_qos *qos)
167 {
168 struct atm_mpoa_qos *entry;
169
170 entry = atm_mpoa_search_qos(dst_ip);
171 if (entry != NULL) {
172 entry->qos = *qos;
173 return entry;
174 }
175
176 entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
177 if (entry == NULL) {
178 pr_info("mpoa: out of memory\n");
179 return entry;
180 }
181
182 entry->ipaddr = dst_ip;
183 entry->qos = *qos;
184
185 entry->next = qos_head;
186 qos_head = entry;
187
188 return entry;
189 }
190
191 struct atm_mpoa_qos *atm_mpoa_search_qos(__be32 dst_ip)
192 {
193 struct atm_mpoa_qos *qos;
194
195 qos = qos_head;
196 while (qos) {
197 if (qos->ipaddr == dst_ip)
198 break;
199 qos = qos->next;
200 }
201
202 return qos;
203 }
204
205 /*
206 * Returns 0 for failure
207 */
208 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
209 {
210 struct atm_mpoa_qos *curr;
211
212 if (entry == NULL)
213 return 0;
214 if (entry == qos_head) {
215 qos_head = qos_head->next;
216 kfree(entry);
217 return 1;
218 }
219
220 curr = qos_head;
221 while (curr != NULL) {
222 if (curr->next == entry) {
223 curr->next = entry->next;
224 kfree(entry);
225 return 1;
226 }
227 curr = curr->next;
228 }
229
230 return 0;
231 }
232
233 /* this is buggered - we need locking for qos_head */
234 void atm_mpoa_disp_qos(struct seq_file *m)
235 {
236 struct atm_mpoa_qos *qos;
237
238 qos = qos_head;
239 seq_printf(m, "QoS entries for shortcuts:\n");
240 seq_printf(m, "IP address\n TX:max_pcr pcr min_pcr max_cdv max_sdu\n RX:max_pcr pcr min_pcr max_cdv max_sdu\n");
241
242 while (qos != NULL) {
243 seq_printf(m, "%pI4\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n",
244 &qos->ipaddr,
245 qos->qos.txtp.max_pcr,
246 qos->qos.txtp.pcr,
247 qos->qos.txtp.min_pcr,
248 qos->qos.txtp.max_cdv,
249 qos->qos.txtp.max_sdu,
250 qos->qos.rxtp.max_pcr,
251 qos->qos.rxtp.pcr,
252 qos->qos.rxtp.min_pcr,
253 qos->qos.rxtp.max_cdv,
254 qos->qos.rxtp.max_sdu);
255 qos = qos->next;
256 }
257 }
258
259 static struct net_device *find_lec_by_itfnum(int itf)
260 {
261 struct net_device *dev;
262 char name[IFNAMSIZ];
263
264 sprintf(name, "lec%d", itf);
265 dev = dev_get_by_name(&init_net, name);
266
267 return dev;
268 }
269
270 static struct mpoa_client *alloc_mpc(void)
271 {
272 struct mpoa_client *mpc;
273
274 mpc = kzalloc(sizeof(struct mpoa_client), GFP_KERNEL);
275 if (mpc == NULL)
276 return NULL;
277 rwlock_init(&mpc->ingress_lock);
278 rwlock_init(&mpc->egress_lock);
279 mpc->next = mpcs;
280 atm_mpoa_init_cache(mpc);
281
282 mpc->parameters.mpc_p1 = MPC_P1;
283 mpc->parameters.mpc_p2 = MPC_P2;
284 memset(mpc->parameters.mpc_p3, 0, sizeof(mpc->parameters.mpc_p3));
285 mpc->parameters.mpc_p4 = MPC_P4;
286 mpc->parameters.mpc_p5 = MPC_P5;
287 mpc->parameters.mpc_p6 = MPC_P6;
288
289 mpcs = mpc;
290
291 return mpc;
292 }
293
294 /*
295 *
296 * start_mpc() puts the MPC on line. All the packets destined
297 * to the lec underneath us are now being monitored and
298 * shortcuts will be established.
299 *
300 */
301 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
302 {
303
304 dprintk("(%s)\n", mpc->dev->name);
305 if (!dev->netdev_ops)
306 pr_info("(%s) not starting\n", dev->name);
307 else {
308 mpc->old_ops = dev->netdev_ops;
309 mpc->new_ops = *mpc->old_ops;
310 mpc->new_ops.ndo_start_xmit = mpc_send_packet;
311 dev->netdev_ops = &mpc->new_ops;
312 }
313 }
314
315 static void stop_mpc(struct mpoa_client *mpc)
316 {
317 struct net_device *dev = mpc->dev;
318 dprintk("(%s)", mpc->dev->name);
319
320 /* Lets not nullify lec device's dev->hard_start_xmit */
321 if (dev->netdev_ops != &mpc->new_ops) {
322 dprintk_cont(" mpc already stopped, not fatal\n");
323 return;
324 }
325 dprintk_cont("\n");
326
327 dev->netdev_ops = mpc->old_ops;
328 mpc->old_ops = NULL;
329
330 }
331
332 static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
333
334 static const char *mpoa_device_type_string(char type)
335 {
336 switch (type) {
337 case NON_MPOA:
338 return "non-MPOA device";
339 case MPS:
340 return "MPS";
341 case MPC:
342 return "MPC";
343 case MPS_AND_MPC:
344 return "both MPS and MPC";
345 }
346
347 return "unspecified (non-MPOA) device";
348 }
349
350 /*
351 * lec device calls this via its netdev_priv(dev)->lane2_ops
352 * ->associate_indicator() when it sees a TLV in LE_ARP packet.
353 * We fill in the pointer above when we see a LANE2 lec initializing
354 * See LANE2 spec 3.1.5
355 *
356 * Quite a big and ugly function but when you look at it
357 * all it does is to try to locate and parse MPOA Device
358 * Type TLV.
359 * We give our lec a pointer to this function and when the
360 * lec sees a TLV it uses the pointer to call this function.
361 *
362 */
363 static void lane2_assoc_ind(struct net_device *dev, const u8 *mac_addr,
364 const u8 *tlvs, u32 sizeoftlvs)
365 {
366 uint32_t type;
367 uint8_t length, mpoa_device_type, number_of_mps_macs;
368 const uint8_t *end_of_tlvs;
369 struct mpoa_client *mpc;
370
371 mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
372 dprintk("(%s) received TLV(s), ", dev->name);
373 dprintk("total length of all TLVs %d\n", sizeoftlvs);
374 mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
375 if (mpc == NULL) {
376 pr_info("(%s) no mpc\n", dev->name);
377 return;
378 }
379 end_of_tlvs = tlvs + sizeoftlvs;
380 while (end_of_tlvs - tlvs >= 5) {
381 type = ((tlvs[0] << 24) | (tlvs[1] << 16) |
382 (tlvs[2] << 8) | tlvs[3]);
383 length = tlvs[4];
384 tlvs += 5;
385 dprintk(" type 0x%x length %02x\n", type, length);
386 if (tlvs + length > end_of_tlvs) {
387 pr_info("TLV value extends past its buffer, aborting parse\n");
388 return;
389 }
390
391 if (type == 0) {
392 pr_info("mpoa: (%s) TLV type was 0, returning\n",
393 dev->name);
394 return;
395 }
396
397 if (type != TLV_MPOA_DEVICE_TYPE) {
398 tlvs += length;
399 continue; /* skip other TLVs */
400 }
401 mpoa_device_type = *tlvs++;
402 number_of_mps_macs = *tlvs++;
403 dprintk("(%s) MPOA device type '%s', ",
404 dev->name, mpoa_device_type_string(mpoa_device_type));
405 if (mpoa_device_type == MPS_AND_MPC &&
406 length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
407 pr_info("(%s) short MPOA Device Type TLV\n",
408 dev->name);
409 continue;
410 }
411 if ((mpoa_device_type == MPS || mpoa_device_type == MPC) &&
412 length < 22 + number_of_mps_macs*ETH_ALEN) {
413 pr_info("(%s) short MPOA Device Type TLV\n", dev->name);
414 continue;
415 }
416 if (mpoa_device_type != MPS &&
417 mpoa_device_type != MPS_AND_MPC) {
418 dprintk("ignoring non-MPS device ");
419 if (mpoa_device_type == MPC)
420 tlvs += 20;
421 continue; /* we are only interested in MPSs */
422 }
423 if (number_of_mps_macs == 0 &&
424 mpoa_device_type == MPS_AND_MPC) {
425 pr_info("(%s) MPS_AND_MPC has zero MACs\n", dev->name);
426 continue; /* someone should read the spec */
427 }
428 dprintk_cont("this MPS has %d MAC addresses\n",
429 number_of_mps_macs);
430
431 /*
432 * ok, now we can go and tell our daemon
433 * the control address of MPS
434 */
435 send_set_mps_ctrl_addr(tlvs, mpc);
436
437 tlvs = copy_macs(mpc, mac_addr, tlvs,
438 number_of_mps_macs, mpoa_device_type);
439 if (tlvs == NULL)
440 return;
441 }
442 if (end_of_tlvs - tlvs != 0)
443 pr_info("(%s) ignoring %Zd bytes of trailing TLV garbage\n",
444 dev->name, end_of_tlvs - tlvs);
445 }
446
447 /*
448 * Store at least advertizing router's MAC address
449 * plus the possible MAC address(es) to mpc->mps_macs.
450 * For a freshly allocated MPOA client mpc->mps_macs == 0.
451 */
452 static const uint8_t *copy_macs(struct mpoa_client *mpc,
453 const uint8_t *router_mac,
454 const uint8_t *tlvs, uint8_t mps_macs,
455 uint8_t device_type)
456 {
457 int num_macs;
458 num_macs = (mps_macs > 1) ? mps_macs : 1;
459
460 if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
461 if (mpc->number_of_mps_macs != 0)
462 kfree(mpc->mps_macs);
463 mpc->number_of_mps_macs = 0;
464 mpc->mps_macs = kmalloc(num_macs * ETH_ALEN, GFP_KERNEL);
465 if (mpc->mps_macs == NULL) {
466 pr_info("(%s) out of mem\n", mpc->dev->name);
467 return NULL;
468 }
469 }
470 memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
471 tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
472 if (mps_macs > 0)
473 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
474 tlvs += mps_macs*ETH_ALEN;
475 mpc->number_of_mps_macs = num_macs;
476
477 return tlvs;
478 }
479
480 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
481 {
482 in_cache_entry *entry;
483 struct iphdr *iph;
484 char *buff;
485 __be32 ipaddr = 0;
486
487 static struct {
488 struct llc_snap_hdr hdr;
489 __be32 tag;
490 } tagged_llc_snap_hdr = {
491 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
492 0
493 };
494
495 buff = skb->data + mpc->dev->hard_header_len;
496 iph = (struct iphdr *)buff;
497 ipaddr = iph->daddr;
498
499 ddprintk("(%s) ipaddr 0x%x\n",
500 mpc->dev->name, ipaddr);
501
502 entry = mpc->in_ops->get(ipaddr, mpc);
503 if (entry == NULL) {
504 entry = mpc->in_ops->add_entry(ipaddr, mpc);
505 if (entry != NULL)
506 mpc->in_ops->put(entry);
507 return 1;
508 }
509 /* threshold not exceeded or VCC not ready */
510 if (mpc->in_ops->cache_hit(entry, mpc) != OPEN) {
511 ddprintk("(%s) cache_hit: returns != OPEN\n",
512 mpc->dev->name);
513 mpc->in_ops->put(entry);
514 return 1;
515 }
516
517 ddprintk("(%s) using shortcut\n",
518 mpc->dev->name);
519 /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
520 if (iph->ttl <= 1) {
521 ddprintk("(%s) IP ttl = %u, using LANE\n",
522 mpc->dev->name, iph->ttl);
523 mpc->in_ops->put(entry);
524 return 1;
525 }
526 iph->ttl--;
527 iph->check = 0;
528 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
529
530 if (entry->ctrl_info.tag != 0) {
531 ddprintk("(%s) adding tag 0x%x\n",
532 mpc->dev->name, entry->ctrl_info.tag);
533 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
534 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
535 skb_push(skb, sizeof(tagged_llc_snap_hdr));
536 /* add LLC/SNAP header */
537 skb_copy_to_linear_data(skb, &tagged_llc_snap_hdr,
538 sizeof(tagged_llc_snap_hdr));
539 } else {
540 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
541 skb_push(skb, sizeof(struct llc_snap_hdr));
542 /* add LLC/SNAP header + tag */
543 skb_copy_to_linear_data(skb, &llc_snap_mpoa_data,
544 sizeof(struct llc_snap_hdr));
545 }
546
547 atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
548 ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
549 entry->shortcut->send(entry->shortcut, skb);
550 entry->packets_fwded++;
551 mpc->in_ops->put(entry);
552
553 return 0;
554 }
555
556 /*
557 * Probably needs some error checks and locking, not sure...
558 */
559 static netdev_tx_t mpc_send_packet(struct sk_buff *skb,
560 struct net_device *dev)
561 {
562 struct mpoa_client *mpc;
563 struct ethhdr *eth;
564 int i = 0;
565
566 mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
567 if (mpc == NULL) {
568 pr_info("(%s) no MPC found\n", dev->name);
569 goto non_ip;
570 }
571
572 eth = (struct ethhdr *)skb->data;
573 if (eth->h_proto != htons(ETH_P_IP))
574 goto non_ip; /* Multi-Protocol Over ATM :-) */
575
576 /* Weed out funny packets (e.g., AF_PACKET or raw). */
577 if (skb->len < ETH_HLEN + sizeof(struct iphdr))
578 goto non_ip;
579 skb_set_network_header(skb, ETH_HLEN);
580 if (skb->len < ETH_HLEN + ip_hdr(skb)->ihl * 4 || ip_hdr(skb)->ihl < 5)
581 goto non_ip;
582
583 while (i < mpc->number_of_mps_macs) {
584 if (!compare_ether_addr(eth->h_dest,
585 (mpc->mps_macs + i*ETH_ALEN)))
586 if (send_via_shortcut(skb, mpc) == 0) /* try shortcut */
587 return NETDEV_TX_OK;
588 i++;
589 }
590
591 non_ip:
592 return mpc->old_ops->ndo_start_xmit(skb, dev);
593 }
594
595 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
596 {
597 int bytes_left;
598 struct mpoa_client *mpc;
599 struct atmmpc_ioc ioc_data;
600 in_cache_entry *in_entry;
601 __be32 ipaddr;
602
603 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
604 if (bytes_left != 0) {
605 pr_info("mpoa:Short read (missed %d bytes) from userland\n",
606 bytes_left);
607 return -EFAULT;
608 }
609 ipaddr = ioc_data.ipaddr;
610 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
611 return -EINVAL;
612
613 mpc = find_mpc_by_itfnum(ioc_data.dev_num);
614 if (mpc == NULL)
615 return -EINVAL;
616
617 if (ioc_data.type == MPC_SOCKET_INGRESS) {
618 in_entry = mpc->in_ops->get(ipaddr, mpc);
619 if (in_entry == NULL ||
620 in_entry->entry_state < INGRESS_RESOLVED) {
621 pr_info("(%s) did not find RESOLVED entry from ingress cache\n",
622 mpc->dev->name);
623 if (in_entry != NULL)
624 mpc->in_ops->put(in_entry);
625 return -EINVAL;
626 }
627 pr_info("(%s) attaching ingress SVC, entry = %pI4\n",
628 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
629 in_entry->shortcut = vcc;
630 mpc->in_ops->put(in_entry);
631 } else {
632 pr_info("(%s) attaching egress SVC\n", mpc->dev->name);
633 }
634
635 vcc->proto_data = mpc->dev;
636 vcc->push = mpc_push;
637
638 return 0;
639 }
640
641 /*
642 *
643 */
644 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
645 {
646 struct mpoa_client *mpc;
647 in_cache_entry *in_entry;
648 eg_cache_entry *eg_entry;
649
650 mpc = find_mpc_by_lec(dev);
651 if (mpc == NULL) {
652 pr_info("(%s) close for unknown MPC\n", dev->name);
653 return;
654 }
655
656 dprintk("(%s)\n", dev->name);
657 in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
658 if (in_entry) {
659 dprintk("(%s) ingress SVC closed ip = %pI4\n",
660 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
661 in_entry->shortcut = NULL;
662 mpc->in_ops->put(in_entry);
663 }
664 eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
665 if (eg_entry) {
666 dprintk("(%s) egress SVC closed\n", mpc->dev->name);
667 eg_entry->shortcut = NULL;
668 mpc->eg_ops->put(eg_entry);
669 }
670
671 if (in_entry == NULL && eg_entry == NULL)
672 dprintk("(%s) unused vcc closed\n", dev->name);
673 }
674
675 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
676 {
677 struct net_device *dev = (struct net_device *)vcc->proto_data;
678 struct sk_buff *new_skb;
679 eg_cache_entry *eg;
680 struct mpoa_client *mpc;
681 __be32 tag;
682 char *tmp;
683
684 ddprintk("(%s)\n", dev->name);
685 if (skb == NULL) {
686 dprintk("(%s) null skb, closing VCC\n", dev->name);
687 mpc_vcc_close(vcc, dev);
688 return;
689 }
690
691 skb->dev = dev;
692 if (memcmp(skb->data, &llc_snap_mpoa_ctrl,
693 sizeof(struct llc_snap_hdr)) == 0) {
694 struct sock *sk = sk_atm(vcc);
695
696 dprintk("(%s) control packet arrived\n", dev->name);
697 /* Pass control packets to daemon */
698 skb_queue_tail(&sk->sk_receive_queue, skb);
699 sk->sk_data_ready(sk, skb->len);
700 return;
701 }
702
703 /* data coming over the shortcut */
704 atm_return(vcc, skb->truesize);
705
706 mpc = find_mpc_by_lec(dev);
707 if (mpc == NULL) {
708 pr_info("(%s) unknown MPC\n", dev->name);
709 return;
710 }
711
712 if (memcmp(skb->data, &llc_snap_mpoa_data_tagged,
713 sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
714 ddprintk("(%s) tagged data packet arrived\n", dev->name);
715
716 } else if (memcmp(skb->data, &llc_snap_mpoa_data,
717 sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
718 pr_info("(%s) Unsupported non-tagged data packet arrived. Purging\n",
719 dev->name);
720 dev_kfree_skb_any(skb);
721 return;
722 } else {
723 pr_info("(%s) garbage arrived, purging\n", dev->name);
724 dev_kfree_skb_any(skb);
725 return;
726 }
727
728 tmp = skb->data + sizeof(struct llc_snap_hdr);
729 tag = *(__be32 *)tmp;
730
731 eg = mpc->eg_ops->get_by_tag(tag, mpc);
732 if (eg == NULL) {
733 pr_info("mpoa: (%s) Didn't find egress cache entry, tag = %u\n",
734 dev->name, tag);
735 purge_egress_shortcut(vcc, NULL);
736 dev_kfree_skb_any(skb);
737 return;
738 }
739
740 /*
741 * See if ingress MPC is using shortcut we opened as a return channel.
742 * This means we have a bi-directional vcc opened by us.
743 */
744 if (eg->shortcut == NULL) {
745 eg->shortcut = vcc;
746 pr_info("(%s) egress SVC in use\n", dev->name);
747 }
748
749 skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag));
750 /* get rid of LLC/SNAP header */
751 new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length);
752 /* LLC/SNAP is shorter than MAC header :( */
753 dev_kfree_skb_any(skb);
754 if (new_skb == NULL) {
755 mpc->eg_ops->put(eg);
756 return;
757 }
758 skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */
759 skb_copy_to_linear_data(new_skb, eg->ctrl_info.DLL_header,
760 eg->ctrl_info.DH_length);
761 new_skb->protocol = eth_type_trans(new_skb, dev);
762 skb_reset_network_header(new_skb);
763
764 eg->latest_ip_addr = ip_hdr(new_skb)->saddr;
765 eg->packets_rcvd++;
766 mpc->eg_ops->put(eg);
767
768 memset(ATM_SKB(new_skb), 0, sizeof(struct atm_skb_data));
769 netif_rx(new_skb);
770 }
771
772 static struct atmdev_ops mpc_ops = { /* only send is required */
773 .close = mpoad_close,
774 .send = msg_from_mpoad
775 };
776
777 static struct atm_dev mpc_dev = {
778 .ops = &mpc_ops,
779 .type = "mpc",
780 .number = 42,
781 .lock = __SPIN_LOCK_UNLOCKED(mpc_dev.lock)
782 /* members not explicitly initialised will be 0 */
783 };
784
785 static int atm_mpoa_mpoad_attach(struct atm_vcc *vcc, int arg)
786 {
787 struct mpoa_client *mpc;
788 struct lec_priv *priv;
789 int err;
790
791 if (mpcs == NULL) {
792 init_timer(&mpc_timer);
793 mpc_timer_refresh();
794
795 /* This lets us now how our LECs are doing */
796 err = register_netdevice_notifier(&mpoa_notifier);
797 if (err < 0) {
798 del_timer(&mpc_timer);
799 return err;
800 }
801 }
802
803 mpc = find_mpc_by_itfnum(arg);
804 if (mpc == NULL) {
805 dprintk("allocating new mpc for itf %d\n", arg);
806 mpc = alloc_mpc();
807 if (mpc == NULL)
808 return -ENOMEM;
809 mpc->dev_num = arg;
810 mpc->dev = find_lec_by_itfnum(arg);
811 /* NULL if there was no lec */
812 }
813 if (mpc->mpoad_vcc) {
814 pr_info("mpoad is already present for itf %d\n", arg);
815 return -EADDRINUSE;
816 }
817
818 if (mpc->dev) { /* check if the lec is LANE2 capable */
819 priv = netdev_priv(mpc->dev);
820 if (priv->lane_version < 2) {
821 dev_put(mpc->dev);
822 mpc->dev = NULL;
823 } else
824 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
825 }
826
827 mpc->mpoad_vcc = vcc;
828 vcc->dev = &mpc_dev;
829 vcc_insert_socket(sk_atm(vcc));
830 set_bit(ATM_VF_META, &vcc->flags);
831 set_bit(ATM_VF_READY, &vcc->flags);
832
833 if (mpc->dev) {
834 char empty[ATM_ESA_LEN];
835 memset(empty, 0, ATM_ESA_LEN);
836
837 start_mpc(mpc, mpc->dev);
838 /* set address if mpcd e.g. gets killed and restarted.
839 * If we do not do it now we have to wait for the next LE_ARP
840 */
841 if (memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0)
842 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
843 }
844
845 __module_get(THIS_MODULE);
846 return arg;
847 }
848
849 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc)
850 {
851 struct k_message mesg;
852
853 memcpy(mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
854
855 mesg.type = SET_MPS_CTRL_ADDR;
856 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
857 msg_to_mpoad(&mesg, mpc);
858 }
859
860 static void mpoad_close(struct atm_vcc *vcc)
861 {
862 struct mpoa_client *mpc;
863 struct sk_buff *skb;
864
865 mpc = find_mpc_by_vcc(vcc);
866 if (mpc == NULL) {
867 pr_info("did not find MPC\n");
868 return;
869 }
870 if (!mpc->mpoad_vcc) {
871 pr_info("close for non-present mpoad\n");
872 return;
873 }
874
875 mpc->mpoad_vcc = NULL;
876 if (mpc->dev) {
877 struct lec_priv *priv = netdev_priv(mpc->dev);
878 priv->lane2_ops->associate_indicator = NULL;
879 stop_mpc(mpc);
880 dev_put(mpc->dev);
881 }
882
883 mpc->in_ops->destroy_cache(mpc);
884 mpc->eg_ops->destroy_cache(mpc);
885
886 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
887 atm_return(vcc, skb->truesize);
888 kfree_skb(skb);
889 }
890
891 pr_info("(%s) going down\n",
892 (mpc->dev) ? mpc->dev->name : "<unknown>");
893 module_put(THIS_MODULE);
894 }
895
896 /*
897 *
898 */
899 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
900 {
901
902 struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
903 struct k_message *mesg = (struct k_message *)skb->data;
904 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
905
906 if (mpc == NULL) {
907 pr_info("no mpc found\n");
908 return 0;
909 }
910 dprintk("(%s)", mpc->dev ? mpc->dev->name : "<unknown>");
911 switch (mesg->type) {
912 case MPOA_RES_REPLY_RCVD:
913 dprintk_cont("mpoa_res_reply_rcvd\n");
914 MPOA_res_reply_rcvd(mesg, mpc);
915 break;
916 case MPOA_TRIGGER_RCVD:
917 dprintk_cont("mpoa_trigger_rcvd\n");
918 MPOA_trigger_rcvd(mesg, mpc);
919 break;
920 case INGRESS_PURGE_RCVD:
921 dprintk_cont("nhrp_purge_rcvd\n");
922 ingress_purge_rcvd(mesg, mpc);
923 break;
924 case EGRESS_PURGE_RCVD:
925 dprintk_cont("egress_purge_reply_rcvd\n");
926 egress_purge_rcvd(mesg, mpc);
927 break;
928 case MPS_DEATH:
929 dprintk_cont("mps_death\n");
930 mps_death(mesg, mpc);
931 break;
932 case CACHE_IMPOS_RCVD:
933 dprintk_cont("cache_impos_rcvd\n");
934 MPOA_cache_impos_rcvd(mesg, mpc);
935 break;
936 case SET_MPC_CTRL_ADDR:
937 dprintk_cont("set_mpc_ctrl_addr\n");
938 set_mpc_ctrl_addr_rcvd(mesg, mpc);
939 break;
940 case SET_MPS_MAC_ADDR:
941 dprintk_cont("set_mps_mac_addr\n");
942 set_mps_mac_addr_rcvd(mesg, mpc);
943 break;
944 case CLEAN_UP_AND_EXIT:
945 dprintk_cont("clean_up_and_exit\n");
946 clean_up(mesg, mpc, DIE);
947 break;
948 case RELOAD:
949 dprintk_cont("reload\n");
950 clean_up(mesg, mpc, RELOAD);
951 break;
952 case SET_MPC_PARAMS:
953 dprintk_cont("set_mpc_params\n");
954 mpc->parameters = mesg->content.params;
955 break;
956 default:
957 dprintk_cont("unknown message %d\n", mesg->type);
958 break;
959 }
960 kfree_skb(skb);
961
962 return 0;
963 }
964
965 /* Remember that this function may not do things that sleep */
966 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
967 {
968 struct sk_buff *skb;
969 struct sock *sk;
970
971 if (mpc == NULL || !mpc->mpoad_vcc) {
972 pr_info("mesg %d to a non-existent mpoad\n", mesg->type);
973 return -ENXIO;
974 }
975
976 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
977 if (skb == NULL)
978 return -ENOMEM;
979 skb_put(skb, sizeof(struct k_message));
980 skb_copy_to_linear_data(skb, mesg, sizeof(*mesg));
981 atm_force_charge(mpc->mpoad_vcc, skb->truesize);
982
983 sk = sk_atm(mpc->mpoad_vcc);
984 skb_queue_tail(&sk->sk_receive_queue, skb);
985 sk->sk_data_ready(sk, skb->len);
986
987 return 0;
988 }
989
990 static int mpoa_event_listener(struct notifier_block *mpoa_notifier,
991 unsigned long event, void *dev_ptr)
992 {
993 struct net_device *dev;
994 struct mpoa_client *mpc;
995 struct lec_priv *priv;
996
997 dev = (struct net_device *)dev_ptr;
998
999 if (!net_eq(dev_net(dev), &init_net))
1000 return NOTIFY_DONE;
1001
1002 if (dev->name == NULL || strncmp(dev->name, "lec", 3))
1003 return NOTIFY_DONE; /* we are only interested in lec:s */
1004
1005 switch (event) {
1006 case NETDEV_REGISTER: /* a new lec device was allocated */
1007 priv = netdev_priv(dev);
1008 if (priv->lane_version < 2)
1009 break;
1010 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
1011 mpc = find_mpc_by_itfnum(priv->itfnum);
1012 if (mpc == NULL) {
1013 dprintk("allocating new mpc for %s\n", dev->name);
1014 mpc = alloc_mpc();
1015 if (mpc == NULL) {
1016 pr_info("no new mpc");
1017 break;
1018 }
1019 }
1020 mpc->dev_num = priv->itfnum;
1021 mpc->dev = dev;
1022 dev_hold(dev);
1023 dprintk("(%s) was initialized\n", dev->name);
1024 break;
1025 case NETDEV_UNREGISTER:
1026 /* the lec device was deallocated */
1027 mpc = find_mpc_by_lec(dev);
1028 if (mpc == NULL)
1029 break;
1030 dprintk("device (%s) was deallocated\n", dev->name);
1031 stop_mpc(mpc);
1032 dev_put(mpc->dev);
1033 mpc->dev = NULL;
1034 break;
1035 case NETDEV_UP:
1036 /* the dev was ifconfig'ed up */
1037 mpc = find_mpc_by_lec(dev);
1038 if (mpc == NULL)
1039 break;
1040 if (mpc->mpoad_vcc != NULL)
1041 start_mpc(mpc, dev);
1042 break;
1043 case NETDEV_DOWN:
1044 /* the dev was ifconfig'ed down */
1045 /* this means that the flow of packets from the
1046 * upper layer stops
1047 */
1048 mpc = find_mpc_by_lec(dev);
1049 if (mpc == NULL)
1050 break;
1051 if (mpc->mpoad_vcc != NULL)
1052 stop_mpc(mpc);
1053 break;
1054 case NETDEV_REBOOT:
1055 case NETDEV_CHANGE:
1056 case NETDEV_CHANGEMTU:
1057 case NETDEV_CHANGEADDR:
1058 case NETDEV_GOING_DOWN:
1059 break;
1060 default:
1061 break;
1062 }
1063
1064 return NOTIFY_DONE;
1065 }
1066
1067 /*
1068 * Functions which are called after a message is received from mpcd.
1069 * Msg is reused on purpose.
1070 */
1071
1072
1073 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1074 {
1075 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1076 in_cache_entry *entry;
1077
1078 entry = mpc->in_ops->get(dst_ip, mpc);
1079 if (entry == NULL) {
1080 entry = mpc->in_ops->add_entry(dst_ip, mpc);
1081 entry->entry_state = INGRESS_RESOLVING;
1082 msg->type = SND_MPOA_RES_RQST;
1083 msg->content.in_info = entry->ctrl_info;
1084 msg_to_mpoad(msg, mpc);
1085 do_gettimeofday(&(entry->reply_wait));
1086 mpc->in_ops->put(entry);
1087 return;
1088 }
1089
1090 if (entry->entry_state == INGRESS_INVALID) {
1091 entry->entry_state = INGRESS_RESOLVING;
1092 msg->type = SND_MPOA_RES_RQST;
1093 msg->content.in_info = entry->ctrl_info;
1094 msg_to_mpoad(msg, mpc);
1095 do_gettimeofday(&(entry->reply_wait));
1096 mpc->in_ops->put(entry);
1097 return;
1098 }
1099
1100 pr_info("(%s) entry already in resolving state\n",
1101 (mpc->dev) ? mpc->dev->name : "<unknown>");
1102 mpc->in_ops->put(entry);
1103 }
1104
1105 /*
1106 * Things get complicated because we have to check if there's an egress
1107 * shortcut with suitable traffic parameters we could use.
1108 */
1109 static void check_qos_and_open_shortcut(struct k_message *msg,
1110 struct mpoa_client *client,
1111 in_cache_entry *entry)
1112 {
1113 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1114 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1115 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1116
1117 if (eg_entry && eg_entry->shortcut) {
1118 if (eg_entry->shortcut->qos.txtp.traffic_class &
1119 msg->qos.txtp.traffic_class &
1120 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)) {
1121 if (eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1122 entry->shortcut = eg_entry->shortcut;
1123 else if (eg_entry->shortcut->qos.txtp.max_pcr > 0)
1124 entry->shortcut = eg_entry->shortcut;
1125 }
1126 if (entry->shortcut) {
1127 dprintk("(%s) using egress SVC to reach %pI4\n",
1128 client->dev->name, &dst_ip);
1129 client->eg_ops->put(eg_entry);
1130 return;
1131 }
1132 }
1133 if (eg_entry != NULL)
1134 client->eg_ops->put(eg_entry);
1135
1136 /* No luck in the egress cache we must open an ingress SVC */
1137 msg->type = OPEN_INGRESS_SVC;
1138 if (qos &&
1139 (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class)) {
1140 msg->qos = qos->qos;
1141 pr_info("(%s) trying to get a CBR shortcut\n",
1142 client->dev->name);
1143 } else
1144 memset(&msg->qos, 0, sizeof(struct atm_qos));
1145 msg_to_mpoad(msg, client);
1146 }
1147
1148 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1149 {
1150 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1151 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1152
1153 dprintk("(%s) ip %pI4\n",
1154 mpc->dev->name, &dst_ip);
1155 ddprintk("(%s) entry = %p",
1156 mpc->dev->name, entry);
1157 if (entry == NULL) {
1158 pr_info("(%s) ARGH, received res. reply for an entry that doesn't exist.\n",
1159 mpc->dev->name);
1160 return;
1161 }
1162 ddprintk_cont(" entry_state = %d ", entry->entry_state);
1163
1164 if (entry->entry_state == INGRESS_RESOLVED) {
1165 pr_info("(%s) RESOLVED entry!\n", mpc->dev->name);
1166 mpc->in_ops->put(entry);
1167 return;
1168 }
1169
1170 entry->ctrl_info = msg->content.in_info;
1171 do_gettimeofday(&(entry->tv));
1172 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1173 entry->refresh_time = 0;
1174 ddprintk_cont("entry->shortcut = %p\n", entry->shortcut);
1175
1176 if (entry->entry_state == INGRESS_RESOLVING &&
1177 entry->shortcut != NULL) {
1178 entry->entry_state = INGRESS_RESOLVED;
1179 mpc->in_ops->put(entry);
1180 return; /* Shortcut already open... */
1181 }
1182
1183 if (entry->shortcut != NULL) {
1184 pr_info("(%s) entry->shortcut != NULL, impossible!\n",
1185 mpc->dev->name);
1186 mpc->in_ops->put(entry);
1187 return;
1188 }
1189
1190 check_qos_and_open_shortcut(msg, mpc, entry);
1191 entry->entry_state = INGRESS_RESOLVED;
1192 mpc->in_ops->put(entry);
1193
1194 return;
1195
1196 }
1197
1198 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1199 {
1200 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1201 __be32 mask = msg->ip_mask;
1202 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1203
1204 if (entry == NULL) {
1205 pr_info("(%s) purge for a non-existing entry, ip = %pI4\n",
1206 mpc->dev->name, &dst_ip);
1207 return;
1208 }
1209
1210 do {
1211 dprintk("(%s) removing an ingress entry, ip = %pI4\n",
1212 mpc->dev->name, &dst_ip);
1213 write_lock_bh(&mpc->ingress_lock);
1214 mpc->in_ops->remove_entry(entry, mpc);
1215 write_unlock_bh(&mpc->ingress_lock);
1216 mpc->in_ops->put(entry);
1217 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1218 } while (entry != NULL);
1219 }
1220
1221 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1222 {
1223 __be32 cache_id = msg->content.eg_info.cache_id;
1224 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1225
1226 if (entry == NULL) {
1227 dprintk("(%s) purge for a non-existing entry\n",
1228 mpc->dev->name);
1229 return;
1230 }
1231
1232 write_lock_irq(&mpc->egress_lock);
1233 mpc->eg_ops->remove_entry(entry, mpc);
1234 write_unlock_irq(&mpc->egress_lock);
1235
1236 mpc->eg_ops->put(entry);
1237 }
1238
1239 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
1240 {
1241 struct sock *sk;
1242 struct k_message *purge_msg;
1243 struct sk_buff *skb;
1244
1245 dprintk("entering\n");
1246 if (vcc == NULL) {
1247 pr_info("vcc == NULL\n");
1248 return;
1249 }
1250
1251 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
1252 if (skb == NULL) {
1253 pr_info("out of memory\n");
1254 return;
1255 }
1256
1257 skb_put(skb, sizeof(struct k_message));
1258 memset(skb->data, 0, sizeof(struct k_message));
1259 purge_msg = (struct k_message *)skb->data;
1260 purge_msg->type = DATA_PLANE_PURGE;
1261 if (entry != NULL)
1262 purge_msg->content.eg_info = entry->ctrl_info;
1263
1264 atm_force_charge(vcc, skb->truesize);
1265
1266 sk = sk_atm(vcc);
1267 skb_queue_tail(&sk->sk_receive_queue, skb);
1268 sk->sk_data_ready(sk, skb->len);
1269 dprintk("exiting\n");
1270 }
1271
1272 /*
1273 * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1274 * of the egress shortcuts we have.
1275 */
1276 static void mps_death(struct k_message *msg, struct mpoa_client *mpc)
1277 {
1278 eg_cache_entry *entry;
1279
1280 dprintk("(%s)\n", mpc->dev->name);
1281
1282 if (memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)) {
1283 pr_info("(%s) wrong MPS\n", mpc->dev->name);
1284 return;
1285 }
1286
1287 read_lock_irq(&mpc->egress_lock);
1288 entry = mpc->eg_cache;
1289 while (entry != NULL) {
1290 purge_egress_shortcut(entry->shortcut, entry);
1291 entry = entry->next;
1292 }
1293 read_unlock_irq(&mpc->egress_lock);
1294
1295 mpc->in_ops->destroy_cache(mpc);
1296 mpc->eg_ops->destroy_cache(mpc);
1297 }
1298
1299 static void MPOA_cache_impos_rcvd(struct k_message *msg,
1300 struct mpoa_client *mpc)
1301 {
1302 uint16_t holding_time;
1303 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1304
1305 holding_time = msg->content.eg_info.holding_time;
1306 dprintk("(%s) entry = %p, holding_time = %u\n",
1307 mpc->dev->name, entry, holding_time);
1308 if (entry == NULL && holding_time) {
1309 entry = mpc->eg_ops->add_entry(msg, mpc);
1310 mpc->eg_ops->put(entry);
1311 return;
1312 }
1313 if (holding_time) {
1314 mpc->eg_ops->update(entry, holding_time);
1315 return;
1316 }
1317
1318 write_lock_irq(&mpc->egress_lock);
1319 mpc->eg_ops->remove_entry(entry, mpc);
1320 write_unlock_irq(&mpc->egress_lock);
1321
1322 mpc->eg_ops->put(entry);
1323 }
1324
1325 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg,
1326 struct mpoa_client *mpc)
1327 {
1328 struct lec_priv *priv;
1329 int i, retval ;
1330
1331 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1332
1333 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */
1334 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */
1335 tlv[5] = 0x02; /* MPOA client */
1336 tlv[6] = 0x00; /* number of MPS MAC addresses */
1337
1338 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1339 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1340
1341 dprintk("(%s) setting MPC ctrl ATM address to",
1342 mpc->dev ? mpc->dev->name : "<unknown>");
1343 for (i = 7; i < sizeof(tlv); i++)
1344 dprintk_cont(" %02x", tlv[i]);
1345 dprintk_cont("\n");
1346
1347 if (mpc->dev) {
1348 priv = netdev_priv(mpc->dev);
1349 retval = priv->lane2_ops->associate_req(mpc->dev,
1350 mpc->dev->dev_addr,
1351 tlv, sizeof(tlv));
1352 if (retval == 0)
1353 pr_info("(%s) MPOA device type TLV association failed\n",
1354 mpc->dev->name);
1355 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1356 if (retval < 0)
1357 pr_info("(%s) targetless LE_ARP request failed\n",
1358 mpc->dev->name);
1359 }
1360 }
1361
1362 static void set_mps_mac_addr_rcvd(struct k_message *msg,
1363 struct mpoa_client *client)
1364 {
1365
1366 if (client->number_of_mps_macs)
1367 kfree(client->mps_macs);
1368 client->number_of_mps_macs = 0;
1369 client->mps_macs = kmemdup(msg->MPS_ctrl, ETH_ALEN, GFP_KERNEL);
1370 if (client->mps_macs == NULL) {
1371 pr_info("out of memory\n");
1372 return;
1373 }
1374 client->number_of_mps_macs = 1;
1375 }
1376
1377 /*
1378 * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1379 */
1380 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1381 {
1382
1383 eg_cache_entry *entry;
1384 msg->type = SND_EGRESS_PURGE;
1385
1386
1387 read_lock_irq(&mpc->egress_lock);
1388 entry = mpc->eg_cache;
1389 while (entry != NULL) {
1390 msg->content.eg_info = entry->ctrl_info;
1391 dprintk("cache_id %u\n", entry->ctrl_info.cache_id);
1392 msg_to_mpoad(msg, mpc);
1393 entry = entry->next;
1394 }
1395 read_unlock_irq(&mpc->egress_lock);
1396
1397 msg->type = action;
1398 msg_to_mpoad(msg, mpc);
1399 }
1400
1401 static void mpc_timer_refresh(void)
1402 {
1403 mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1404 mpc_timer.data = mpc_timer.expires;
1405 mpc_timer.function = mpc_cache_check;
1406 add_timer(&mpc_timer);
1407 }
1408
1409 static void mpc_cache_check(unsigned long checking_time)
1410 {
1411 struct mpoa_client *mpc = mpcs;
1412 static unsigned long previous_resolving_check_time;
1413 static unsigned long previous_refresh_time;
1414
1415 while (mpc != NULL) {
1416 mpc->in_ops->clear_count(mpc);
1417 mpc->eg_ops->clear_expired(mpc);
1418 if (checking_time - previous_resolving_check_time >
1419 mpc->parameters.mpc_p4 * HZ) {
1420 mpc->in_ops->check_resolving(mpc);
1421 previous_resolving_check_time = checking_time;
1422 }
1423 if (checking_time - previous_refresh_time >
1424 mpc->parameters.mpc_p5 * HZ) {
1425 mpc->in_ops->refresh(mpc);
1426 previous_refresh_time = checking_time;
1427 }
1428 mpc = mpc->next;
1429 }
1430 mpc_timer_refresh();
1431 }
1432
1433 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd,
1434 unsigned long arg)
1435 {
1436 int err = 0;
1437 struct atm_vcc *vcc = ATM_SD(sock);
1438
1439 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1440 return -ENOIOCTLCMD;
1441
1442 if (!capable(CAP_NET_ADMIN))
1443 return -EPERM;
1444
1445 switch (cmd) {
1446 case ATMMPC_CTRL:
1447 err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1448 if (err >= 0)
1449 sock->state = SS_CONNECTED;
1450 break;
1451 case ATMMPC_DATA:
1452 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1453 break;
1454 default:
1455 break;
1456 }
1457 return err;
1458 }
1459
1460 static struct atm_ioctl atm_ioctl_ops = {
1461 .owner = THIS_MODULE,
1462 .ioctl = atm_mpoa_ioctl,
1463 };
1464
1465 static __init int atm_mpoa_init(void)
1466 {
1467 register_atm_ioctl(&atm_ioctl_ops);
1468
1469 if (mpc_proc_init() != 0)
1470 pr_info("failed to initialize /proc/mpoa\n");
1471
1472 pr_info("mpc.c: " __DATE__ " " __TIME__ " initialized\n");
1473
1474 return 0;
1475 }
1476
1477 static void __exit atm_mpoa_cleanup(void)
1478 {
1479 struct mpoa_client *mpc, *tmp;
1480 struct atm_mpoa_qos *qos, *nextqos;
1481 struct lec_priv *priv;
1482
1483 mpc_proc_clean();
1484
1485 del_timer(&mpc_timer);
1486 unregister_netdevice_notifier(&mpoa_notifier);
1487 deregister_atm_ioctl(&atm_ioctl_ops);
1488
1489 mpc = mpcs;
1490 mpcs = NULL;
1491 while (mpc != NULL) {
1492 tmp = mpc->next;
1493 if (mpc->dev != NULL) {
1494 stop_mpc(mpc);
1495 priv = netdev_priv(mpc->dev);
1496 if (priv->lane2_ops != NULL)
1497 priv->lane2_ops->associate_indicator = NULL;
1498 }
1499 ddprintk("about to clear caches\n");
1500 mpc->in_ops->destroy_cache(mpc);
1501 mpc->eg_ops->destroy_cache(mpc);
1502 ddprintk("caches cleared\n");
1503 kfree(mpc->mps_macs);
1504 memset(mpc, 0, sizeof(struct mpoa_client));
1505 ddprintk("about to kfree %p\n", mpc);
1506 kfree(mpc);
1507 ddprintk("next mpc is at %p\n", tmp);
1508 mpc = tmp;
1509 }
1510
1511 qos = qos_head;
1512 qos_head = NULL;
1513 while (qos != NULL) {
1514 nextqos = qos->next;
1515 dprintk("freeing qos entry %p\n", qos);
1516 kfree(qos);
1517 qos = nextqos;
1518 }
1519 }
1520
1521 module_init(atm_mpoa_init);
1522 module_exit(atm_mpoa_cleanup);
1523
1524 MODULE_LICENSE("GPL");
Tomato firmware and modifications.