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An NFS client is useful, as is NFS root.
[linux-2.6/linux-mips.git] / net / atm / mpc.c
blob17a81ebe7e6eb0d0a1739c956d14a005c5d45186
1 #include <linux/kernel.h>
2 #include <linux/string.h>
3 #include <linux/timer.h>
4 #include <linux/init.h>
5 #include <linux/bitops.h>
6 #include <linux/seq_file.h>
7
8 /* We are an ethernet device */
9 #include <linux/if_ether.h>
10 #include <linux/netdevice.h>
11 #include <linux/etherdevice.h>
12 #include <net/sock.h>
13 #include <linux/skbuff.h>
14 #include <linux/ip.h>
15 #include <asm/byteorder.h>
16 #include <asm/uaccess.h>
17 #include <net/checksum.h> /* for ip_fast_csum() */
18 #include <net/arp.h>
19 #include <net/dst.h>
20 #include <linux/proc_fs.h>
21
22 /* And atm device */
23 #include <linux/atmdev.h>
24 #include <linux/atmlec.h>
25 #include <linux/atmmpc.h>
26 /* Modular too */
27 #include <linux/config.h>
28 #include <linux/module.h>
29
30 #include "lec.h"
31 #include "mpc.h"
32 #include "resources.h"
33
34 /*
35 * mpc.c: Implementation of MPOA client kernel part
36 */
37
38 #if 0
39 #define dprintk printk /* debug */
40 #else
41 #define dprintk(format,args...)
42 #endif
43
44 #if 0
45 #define ddprintk printk /* more debug */
46 #else
47 #define ddprintk(format,args...)
48 #endif
49
50
51
52 #define MPOA_TAG_LEN 4
53
54 /* mpc_daemon -> kernel */
55 static void MPOA_trigger_rcvd (struct k_message *msg, struct mpoa_client *mpc);
56 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
57 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
58 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
59 static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
60 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action);
61 static void MPOA_cache_impos_rcvd(struct k_message *msg, struct mpoa_client *mpc);
62 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
63 static void set_mps_mac_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
64
65 static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
66 uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type);
67 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
68
69 static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc);
70 static void mpoad_close(struct atm_vcc *vcc);
71 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
72
73 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
74 static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev);
75 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev);
76 static void mpc_timer_refresh(void);
77 static void mpc_cache_check( unsigned long checking_time );
78
79 static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
80 0xaa, 0xaa, 0x03,
81 {0x00, 0x00, 0x5e},
82 {0x00, 0x03} /* For MPOA control PDUs */
83 };
84 static struct llc_snap_hdr llc_snap_mpoa_data = {
85 0xaa, 0xaa, 0x03,
86 {0x00, 0x00, 0x00},
87 {0x08, 0x00} /* This is for IP PDUs only */
88 };
89 static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
90 0xaa, 0xaa, 0x03,
91 {0x00, 0x00, 0x00},
92 {0x88, 0x4c} /* This is for tagged data PDUs */
93 };
94
95 static struct notifier_block mpoa_notifier = {
96 mpoa_event_listener,
97 NULL,
98 0
99 };
100
101 #ifdef CONFIG_PROC_FS
102 extern int mpc_proc_init(void);
103 extern void mpc_proc_clean(void);
104 #endif
105
106 struct mpoa_client *mpcs = NULL; /* FIXME */
107 static struct atm_mpoa_qos *qos_head = NULL;
108 static struct timer_list mpc_timer = TIMER_INITIALIZER(NULL, 0, 0);
109
110
111 static struct mpoa_client *find_mpc_by_itfnum(int itf)
112 {
113 struct mpoa_client *mpc;
114
115 mpc = mpcs; /* our global linked list */
116 while (mpc != NULL) {
117 if (mpc->dev_num == itf)
118 return mpc;
119 mpc = mpc->next;
120 }
121
122 return NULL; /* not found */
123 }
124
125 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
126 {
127 struct mpoa_client *mpc;
128
129 mpc = mpcs; /* our global linked list */
130 while (mpc != NULL) {
131 if (mpc->mpoad_vcc == vcc)
132 return mpc;
133 mpc = mpc->next;
134 }
135
136 return NULL; /* not found */
137 }
138
139 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
140 {
141 struct mpoa_client *mpc;
142
143 mpc = mpcs; /* our global linked list */
144 while (mpc != NULL) {
145 if (mpc->dev == dev)
146 return mpc;
147 mpc = mpc->next;
148 }
149
150 return NULL; /* not found */
151 }
152
153 /*
154 * Functions for managing QoS list
155 */
156
157 /*
158 * Overwrites the old entry or makes a new one.
159 */
160 struct atm_mpoa_qos *atm_mpoa_add_qos(uint32_t dst_ip, struct atm_qos *qos)
161 {
162 struct atm_mpoa_qos *entry;
163
164 entry = atm_mpoa_search_qos(dst_ip);
165 if (entry != NULL) {
166 entry->qos = *qos;
167 return entry;
168 }
169
170 entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
171 if (entry == NULL) {
172 printk("mpoa: atm_mpoa_add_qos: out of memory\n");
173 return entry;
174 }
175
176 entry->ipaddr = dst_ip;
177 entry->qos = *qos;
178
179 entry->next = qos_head;
180 qos_head = entry;
181
182 return entry;
183 }
184
185 struct atm_mpoa_qos *atm_mpoa_search_qos(uint32_t dst_ip)
186 {
187 struct atm_mpoa_qos *qos;
188
189 qos = qos_head;
190 while( qos != NULL ){
191 if(qos->ipaddr == dst_ip) {
192 break;
193 }
194 qos = qos->next;
195 }
196
197 return qos;
198 }
199
200 /*
201 * Returns 0 for failure
202 */
203 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
204 {
205
206 struct atm_mpoa_qos *curr;
207
208 if (entry == NULL) return 0;
209 if (entry == qos_head) {
210 qos_head = qos_head->next;
211 kfree(entry);
212 return 1;
213 }
214
215 curr = qos_head;
216 while (curr != NULL) {
217 if (curr->next == entry) {
218 curr->next = entry->next;
219 kfree(entry);
220 return 1;
221 }
222 curr = curr->next;
223 }
224
225 return 0;
226 }
227
228 /* this is buggered - we need locking for qos_head */
229 void atm_mpoa_disp_qos(struct seq_file *m)
230 {
231 unsigned char *ip;
232 char ipaddr[16];
233 struct atm_mpoa_qos *qos;
234
235 qos = qos_head;
236 seq_printf(m, "QoS entries for shortcuts:\n");
237 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");
238
239 ipaddr[sizeof(ipaddr)-1] = '\0';
240 while (qos != NULL) {
241 ip = (unsigned char *)&qos->ipaddr;
242 sprintf(ipaddr, "%u.%u.%u.%u", NIPQUAD(ip));
243 seq_printf(m, "%u.%u.%u.%u\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n",
244 NIPQUAD(ipaddr),
245 qos->qos.txtp.max_pcr, qos->qos.txtp.pcr, qos->qos.txtp.min_pcr, qos->qos.txtp.max_cdv, qos->qos.txtp.max_sdu,
246 qos->qos.rxtp.max_pcr, qos->qos.rxtp.pcr, qos->qos.rxtp.min_pcr, qos->qos.rxtp.max_cdv, qos->qos.rxtp.max_sdu);
247 qos = qos->next;
248 }
249 }
250
251 static struct net_device *find_lec_by_itfnum(int itf)
252 {
253 struct net_device *dev;
254 char name[IFNAMSIZ];
255
256 sprintf(name, "lec%d", itf);
257 dev = dev_get_by_name(name);
258
259 return dev;
260 }
261
262 static struct mpoa_client *alloc_mpc(void)
263 {
264 struct mpoa_client *mpc;
265
266 mpc = kmalloc(sizeof (struct mpoa_client), GFP_KERNEL);
267 if (mpc == NULL)
268 return NULL;
269 memset(mpc, 0, sizeof(struct mpoa_client));
270 rwlock_init(&mpc->ingress_lock);
271 rwlock_init(&mpc->egress_lock);
272 mpc->next = mpcs;
273 atm_mpoa_init_cache(mpc);
274
275 mpc->parameters.mpc_p1 = MPC_P1;
276 mpc->parameters.mpc_p2 = MPC_P2;
277 memset(mpc->parameters.mpc_p3,0,sizeof(mpc->parameters.mpc_p3));
278 mpc->parameters.mpc_p4 = MPC_P4;
279 mpc->parameters.mpc_p5 = MPC_P5;
280 mpc->parameters.mpc_p6 = MPC_P6;
281
282 mpcs = mpc;
283
284 return mpc;
285 }
286
287 /*
288 *
289 * start_mpc() puts the MPC on line. All the packets destined
290 * to the lec underneath us are now being monitored and
291 * shortcuts will be established.
292 *
293 */
294 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
295 {
296
297 dprintk("mpoa: (%s) start_mpc:\n", mpc->dev->name);
298 if (dev->hard_start_xmit == NULL) {
299 printk("mpoa: (%s) start_mpc: dev->hard_start_xmit == NULL, not starting\n",
300 dev->name);
301 return;
302 }
303 mpc->old_hard_start_xmit = dev->hard_start_xmit;
304 dev->hard_start_xmit = mpc_send_packet;
305
306 return;
307 }
308
309 static void stop_mpc(struct mpoa_client *mpc)
310 {
311
312 dprintk("mpoa: (%s) stop_mpc:", mpc->dev->name);
313
314 /* Lets not nullify lec device's dev->hard_start_xmit */
315 if (mpc->dev->hard_start_xmit != mpc_send_packet) {
316 dprintk(" mpc already stopped, not fatal\n");
317 return;
318 }
319 dprintk("\n");
320 mpc->dev->hard_start_xmit = mpc->old_hard_start_xmit;
321 mpc->old_hard_start_xmit = NULL;
322 /* close_shortcuts(mpc); ??? FIXME */
323
324 return;
325 }
326
327 static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
328
329 static const char *mpoa_device_type_string(char type)
330 {
331 switch(type) {
332 case NON_MPOA:
333 return "non-MPOA device";
334 break;
335 case MPS:
336 return "MPS";
337 break;
338 case MPC:
339 return "MPC";
340 break;
341 case MPS_AND_MPC:
342 return "both MPS and MPC";
343 break;
344 default:
345 return "unspecified (non-MPOA) device";
346 break;
347 }
348
349 return ""; /* not reached */
350 }
351
352 /*
353 * lec device calls this via its dev->priv->lane2_ops->associate_indicator()
354 * when it sees a TLV in LE_ARP packet.
355 * We fill in the pointer above when we see a LANE2 lec initializing
356 * See LANE2 spec 3.1.5
357 *
358 * Quite a big and ugly function but when you look at it
359 * all it does is to try to locate and parse MPOA Device
360 * Type TLV.
361 * We give our lec a pointer to this function and when the
362 * lec sees a TLV it uses the pointer to call this function.
363 *
364 */
365 static void lane2_assoc_ind(struct net_device *dev, uint8_t *mac_addr,
366 uint8_t *tlvs, uint32_t sizeoftlvs)
367 {
368 uint32_t type;
369 uint8_t length, mpoa_device_type, number_of_mps_macs;
370 uint8_t *end_of_tlvs;
371 struct mpoa_client *mpc;
372
373 mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
374 dprintk("mpoa: (%s) lane2_assoc_ind: received TLV(s), ", dev->name);
375 dprintk("total length of all TLVs %d\n", sizeoftlvs);
376 mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
377 if (mpc == NULL) {
378 printk("mpoa: (%s) lane2_assoc_ind: no mpc\n", dev->name);
379 return;
380 }
381 end_of_tlvs = tlvs + sizeoftlvs;
382 while (end_of_tlvs - tlvs >= 5) {
383 type = (tlvs[0] << 24) | (tlvs[1] << 16) | (tlvs[2] << 8) | tlvs[3];
384 length = tlvs[4];
385 tlvs += 5;
386 dprintk(" type 0x%x length %02x\n", type, length);
387 if (tlvs + length > end_of_tlvs) {
388 printk("TLV value extends past its buffer, aborting parse\n");
389 return;
390 }
391
392 if (type == 0) {
393 printk("mpoa: (%s) lane2_assoc_ind: TLV type was 0, returning\n", 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("mpoa: (%s) MPOA device type '%s', ", dev->name, mpoa_device_type_string(mpoa_device_type));
404 if (mpoa_device_type == MPS_AND_MPC &&
405 length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
406 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
407 dev->name);
408 continue;
409 }
410 if ((mpoa_device_type == MPS || mpoa_device_type == MPC)
411 && length < 22 + number_of_mps_macs*ETH_ALEN) {
412 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
413 dev->name);
414 continue;
415 }
416 if (mpoa_device_type != MPS && mpoa_device_type != MPS_AND_MPC) {
417 dprintk("ignoring non-MPS device\n");
418 if (mpoa_device_type == MPC) tlvs += 20;
419 continue; /* we are only interested in MPSs */
420 }
421 if (number_of_mps_macs == 0 && mpoa_device_type == MPS_AND_MPC) {
422 printk("\nmpoa: (%s) lane2_assoc_ind: MPS_AND_MPC has zero MACs\n", dev->name);
423 continue; /* someone should read the spec */
424 }
425 dprintk("this MPS has %d MAC addresses\n", number_of_mps_macs);
426
427 /* ok, now we can go and tell our daemon the control address of MPS */
428 send_set_mps_ctrl_addr(tlvs, mpc);
429
430 tlvs = copy_macs(mpc, mac_addr, tlvs, number_of_mps_macs, mpoa_device_type);
431 if (tlvs == NULL) return;
432 }
433 if (end_of_tlvs - tlvs != 0)
434 printk("mpoa: (%s) lane2_assoc_ind: ignoring %Zd bytes of trailing TLV carbage\n",
435 dev->name, end_of_tlvs - tlvs);
436 return;
437 }
438
439 /*
440 * Store at least advertizing router's MAC address
441 * plus the possible MAC address(es) to mpc->mps_macs.
442 * For a freshly allocated MPOA client mpc->mps_macs == 0.
443 */
444 static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
445 uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type)
446 {
447 int num_macs;
448 num_macs = (mps_macs > 1) ? mps_macs : 1;
449
450 if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
451 if (mpc->number_of_mps_macs != 0) kfree(mpc->mps_macs);
452 mpc->number_of_mps_macs = 0;
453 mpc->mps_macs = kmalloc(num_macs*ETH_ALEN, GFP_KERNEL);
454 if (mpc->mps_macs == NULL) {
455 printk("mpoa: (%s) copy_macs: out of mem\n", mpc->dev->name);
456 return NULL;
457 }
458 }
459 memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
460 tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
461 if (mps_macs > 0)
462 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
463 tlvs += mps_macs*ETH_ALEN;
464 mpc->number_of_mps_macs = num_macs;
465
466 return tlvs;
467 }
468
469 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
470 {
471 in_cache_entry *entry;
472 struct iphdr *iph;
473 char *buff;
474 uint32_t ipaddr = 0;
475
476 static struct {
477 struct llc_snap_hdr hdr;
478 uint32_t tag;
479 } tagged_llc_snap_hdr = {
480 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
481 0
482 };
483
484 buff = skb->data + mpc->dev->hard_header_len;
485 iph = (struct iphdr *)buff;
486 ipaddr = iph->daddr;
487
488 ddprintk("mpoa: (%s) send_via_shortcut: ipaddr 0x%x\n", mpc->dev->name, ipaddr);
489
490 entry = mpc->in_ops->get(ipaddr, mpc);
491 if (entry == NULL) {
492 entry = mpc->in_ops->add_entry(ipaddr, mpc);
493 if (entry != NULL) mpc->in_ops->put(entry);
494 return 1;
495 }
496 if (mpc->in_ops->cache_hit(entry, mpc) != OPEN){ /* threshold not exceeded or VCC not ready */
497 ddprintk("mpoa: (%s) send_via_shortcut: cache_hit: returns != OPEN\n", mpc->dev->name);
498 mpc->in_ops->put(entry);
499 return 1;
500 }
501
502 ddprintk("mpoa: (%s) send_via_shortcut: using shortcut\n", mpc->dev->name);
503 /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
504 if (iph->ttl <= 1) {
505 ddprintk("mpoa: (%s) send_via_shortcut: IP ttl = %u, using LANE\n", mpc->dev->name, iph->ttl);
506 mpc->in_ops->put(entry);
507 return 1;
508 }
509 iph->ttl--;
510 iph->check = 0;
511 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
512
513 if (entry->ctrl_info.tag != 0) {
514 ddprintk("mpoa: (%s) send_via_shortcut: adding tag 0x%x\n", mpc->dev->name, entry->ctrl_info.tag);
515 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
516 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
517 skb_push(skb, sizeof(tagged_llc_snap_hdr)); /* add LLC/SNAP header */
518 memcpy(skb->data, &tagged_llc_snap_hdr, sizeof(tagged_llc_snap_hdr));
519 } else {
520 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
521 skb_push(skb, sizeof(struct llc_snap_hdr)); /* add LLC/SNAP header + tag */
522 memcpy(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr));
523 }
524
525 atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
526 ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
527 entry->shortcut->send(entry->shortcut, skb);
528 entry->packets_fwded++;
529 mpc->in_ops->put(entry);
530
531 return 0;
532 }
533
534 /*
535 * Probably needs some error checks and locking, not sure...
536 */
537 static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev)
538 {
539 int retval;
540 struct mpoa_client *mpc;
541 struct ethhdr *eth;
542 int i = 0;
543
544 mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
545 if(mpc == NULL) {
546 printk("mpoa: (%s) mpc_send_packet: no MPC found\n", dev->name);
547 goto non_ip;
548 }
549
550 eth = (struct ethhdr *)skb->data;
551 if (eth->h_proto != htons(ETH_P_IP))
552 goto non_ip; /* Multi-Protocol Over ATM :-) */
553
554 while (i < mpc->number_of_mps_macs) {
555 if (memcmp(eth->h_dest, (mpc->mps_macs + i*ETH_ALEN), ETH_ALEN) == 0)
556 if ( send_via_shortcut(skb, mpc) == 0 ) /* try shortcut */
557 return 0; /* success! */
558 i++;
559 }
560
561 non_ip:
562 retval = mpc->old_hard_start_xmit(skb,dev);
563
564 return retval;
565 }
566
567 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
568 {
569 int bytes_left;
570 struct mpoa_client *mpc;
571 struct atmmpc_ioc ioc_data;
572 in_cache_entry *in_entry;
573 uint32_t ipaddr;
574 unsigned char *ip;
575
576 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
577 if (bytes_left != 0) {
578 printk("mpoa: mpc_vcc_attach: Short read (missed %d bytes) from userland\n", bytes_left);
579 return -EFAULT;
580 }
581 ipaddr = ioc_data.ipaddr;
582 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
583 return -EINVAL;
584
585 mpc = find_mpc_by_itfnum(ioc_data.dev_num);
586 if (mpc == NULL)
587 return -EINVAL;
588
589 if (ioc_data.type == MPC_SOCKET_INGRESS) {
590 in_entry = mpc->in_ops->get(ipaddr, mpc);
591 if (in_entry == NULL || in_entry->entry_state < INGRESS_RESOLVED) {
592 printk("mpoa: (%s) mpc_vcc_attach: did not find RESOLVED entry from ingress cache\n",
593 mpc->dev->name);
594 if (in_entry != NULL) mpc->in_ops->put(in_entry);
595 return -EINVAL;
596 }
597 ip = (unsigned char*)&in_entry->ctrl_info.in_dst_ip;
598 printk("mpoa: (%s) mpc_vcc_attach: attaching ingress SVC, entry = %u.%u.%u.%u\n",
599 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
600 in_entry->shortcut = vcc;
601 mpc->in_ops->put(in_entry);
602 } else {
603 printk("mpoa: (%s) mpc_vcc_attach: attaching egress SVC\n", mpc->dev->name);
604 }
605
606 vcc->proto_data = mpc->dev;
607 vcc->push = mpc_push;
608
609 return 0;
610 }
611
612 /*
613 *
614 */
615 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
616 {
617 struct mpoa_client *mpc;
618 in_cache_entry *in_entry;
619 eg_cache_entry *eg_entry;
620
621 mpc = find_mpc_by_lec(dev);
622 if (mpc == NULL) {
623 printk("mpoa: (%s) mpc_vcc_close: close for unknown MPC\n", dev->name);
624 return;
625 }
626
627 dprintk("mpoa: (%s) mpc_vcc_close:\n", dev->name);
628 in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
629 if (in_entry) {
630 unsigned char *ip __attribute__ ((unused)) =
631 (unsigned char *)&in_entry->ctrl_info.in_dst_ip;
632 dprintk("mpoa: (%s) mpc_vcc_close: ingress SVC closed ip = %u.%u.%u.%u\n",
633 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
634 in_entry->shortcut = NULL;
635 mpc->in_ops->put(in_entry);
636 }
637 eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
638 if (eg_entry) {
639 dprintk("mpoa: (%s) mpc_vcc_close: egress SVC closed\n", mpc->dev->name);
640 eg_entry->shortcut = NULL;
641 mpc->eg_ops->put(eg_entry);
642 }
643
644 if (in_entry == NULL && eg_entry == NULL)
645 dprintk("mpoa: (%s) mpc_vcc_close: unused vcc closed\n", dev->name);
646
647 return;
648 }
649
650 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
651 {
652 struct net_device *dev = (struct net_device *)vcc->proto_data;
653 struct sk_buff *new_skb;
654 eg_cache_entry *eg;
655 struct mpoa_client *mpc;
656 uint32_t tag;
657 char *tmp;
658
659 ddprintk("mpoa: (%s) mpc_push:\n", dev->name);
660 if (skb == NULL) {
661 dprintk("mpoa: (%s) mpc_push: null skb, closing VCC\n", dev->name);
662 mpc_vcc_close(vcc, dev);
663 return;
664 }
665
666 skb->dev = dev;
667 if (memcmp(skb->data, &llc_snap_mpoa_ctrl, sizeof(struct llc_snap_hdr)) == 0) {
668 struct sock *sk = sk_atm(vcc);
669
670 dprintk("mpoa: (%s) mpc_push: control packet arrived\n", dev->name);
671 /* Pass control packets to daemon */
672 skb_queue_tail(&sk->sk_receive_queue, skb);
673 sk->sk_data_ready(sk, skb->len);
674 return;
675 }
676
677 /* data coming over the shortcut */
678 atm_return(vcc, skb->truesize);
679
680 mpc = find_mpc_by_lec(dev);
681 if (mpc == NULL) {
682 printk("mpoa: (%s) mpc_push: unknown MPC\n", dev->name);
683 return;
684 }
685
686 if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
687 ddprintk("mpoa: (%s) mpc_push: tagged data packet arrived\n", dev->name);
688
689 } else if (memcmp(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
690 printk("mpoa: (%s) mpc_push: non-tagged data packet arrived\n", dev->name);
691 printk(" mpc_push: non-tagged data unsupported, purging\n");
692 dev_kfree_skb_any(skb);
693 return;
694 } else {
695 printk("mpoa: (%s) mpc_push: garbage arrived, purging\n", dev->name);
696 dev_kfree_skb_any(skb);
697 return;
698 }
699
700 tmp = skb->data + sizeof(struct llc_snap_hdr);
701 tag = *(uint32_t *)tmp;
702
703 eg = mpc->eg_ops->get_by_tag(tag, mpc);
704 if (eg == NULL) {
705 printk("mpoa: (%s) mpc_push: Didn't find egress cache entry, tag = %u\n",
706 dev->name,tag);
707 purge_egress_shortcut(vcc, NULL);
708 dev_kfree_skb_any(skb);
709 return;
710 }
711
712 /*
713 * See if ingress MPC is using shortcut we opened as a return channel.
714 * This means we have a bi-directional vcc opened by us.
715 */
716 if (eg->shortcut == NULL) {
717 eg->shortcut = vcc;
718 printk("mpoa: (%s) mpc_push: egress SVC in use\n", dev->name);
719 }
720
721 skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); /* get rid of LLC/SNAP header */
722 new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); /* LLC/SNAP is shorter than MAC header :( */
723 dev_kfree_skb_any(skb);
724 if (new_skb == NULL){
725 mpc->eg_ops->put(eg);
726 return;
727 }
728 skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */
729 memcpy(new_skb->data, eg->ctrl_info.DLL_header, eg->ctrl_info.DH_length);
730 new_skb->protocol = eth_type_trans(new_skb, dev);
731 new_skb->nh.raw = new_skb->data;
732
733 eg->latest_ip_addr = new_skb->nh.iph->saddr;
734 eg->packets_rcvd++;
735 mpc->eg_ops->put(eg);
736
737 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
738 netif_rx(new_skb);
739
740 return;
741 }
742
743 static struct atmdev_ops mpc_ops = { /* only send is required */
744 .close = mpoad_close,
745 .send = msg_from_mpoad
746 };
747
748 static struct atm_dev mpc_dev = {
749 .ops = &mpc_ops,
750 .type = "mpc",
751 .number = 42,
752 .lock = SPIN_LOCK_UNLOCKED
753 /* members not explicitly initialised will be 0 */
754 };
755
756 static int atm_mpoa_mpoad_attach (struct atm_vcc *vcc, int arg)
757 {
758 struct mpoa_client *mpc;
759 struct lec_priv *priv;
760 int err;
761
762 if (mpcs == NULL) {
763 init_timer(&mpc_timer);
764 mpc_timer_refresh();
765
766 /* This lets us now how our LECs are doing */
767 err = register_netdevice_notifier(&mpoa_notifier);
768 if (err < 0) {
769 del_timer(&mpc_timer);
770 return err;
771 }
772 }
773
774 mpc = find_mpc_by_itfnum(arg);
775 if (mpc == NULL) {
776 dprintk("mpoa: mpoad_attach: allocating new mpc for itf %d\n", arg);
777 mpc = alloc_mpc();
778 if (mpc == NULL)
779 return -ENOMEM;
780 mpc->dev_num = arg;
781 mpc->dev = find_lec_by_itfnum(arg); /* NULL if there was no lec */
782 }
783 if (mpc->mpoad_vcc) {
784 printk("mpoa: mpoad_attach: mpoad is already present for itf %d\n", arg);
785 return -EADDRINUSE;
786 }
787
788 if (mpc->dev) { /* check if the lec is LANE2 capable */
789 priv = (struct lec_priv *)mpc->dev->priv;
790 if (priv->lane_version < 2) {
791 dev_put(mpc->dev);
792 mpc->dev = NULL;
793 } else
794 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
795 }
796
797 mpc->mpoad_vcc = vcc;
798 vcc->dev = &mpc_dev;
799 vcc_insert_socket(sk_atm(vcc));
800 set_bit(ATM_VF_META,&vcc->flags);
801 set_bit(ATM_VF_READY,&vcc->flags);
802
803 if (mpc->dev) {
804 char empty[ATM_ESA_LEN];
805 memset(empty, 0, ATM_ESA_LEN);
806
807 start_mpc(mpc, mpc->dev);
808 /* set address if mpcd e.g. gets killed and restarted.
809 * If we do not do it now we have to wait for the next LE_ARP
810 */
811 if ( memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0 )
812 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
813 }
814
815 __module_get(THIS_MODULE);
816 return arg;
817 }
818
819 static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc)
820 {
821 struct k_message mesg;
822
823 memcpy (mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
824
825 mesg.type = SET_MPS_CTRL_ADDR;
826 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
827 msg_to_mpoad(&mesg, mpc);
828
829 return;
830 }
831
832 static void mpoad_close(struct atm_vcc *vcc)
833 {
834 struct mpoa_client *mpc;
835 struct sk_buff *skb;
836
837 mpc = find_mpc_by_vcc(vcc);
838 if (mpc == NULL) {
839 printk("mpoa: mpoad_close: did not find MPC\n");
840 return;
841 }
842 if (!mpc->mpoad_vcc) {
843 printk("mpoa: mpoad_close: close for non-present mpoad\n");
844 return;
845 }
846
847 mpc->mpoad_vcc = NULL;
848 if (mpc->dev) {
849 struct lec_priv *priv = (struct lec_priv *)mpc->dev->priv;
850 priv->lane2_ops->associate_indicator = NULL;
851 stop_mpc(mpc);
852 dev_put(mpc->dev);
853 }
854
855 mpc->in_ops->destroy_cache(mpc);
856 mpc->eg_ops->destroy_cache(mpc);
857
858 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
859 atm_return(vcc, skb->truesize);
860 kfree_skb(skb);
861 }
862
863 printk("mpoa: (%s) going down\n",
864 (mpc->dev) ? mpc->dev->name : "<unknown>");
865 module_put(THIS_MODULE);
866
867 return;
868 }
869
870 /*
871 *
872 */
873 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
874 {
875
876 struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
877 struct k_message *mesg = (struct k_message*)skb->data;
878 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
879
880 if (mpc == NULL) {
881 printk("mpoa: msg_from_mpoad: no mpc found\n");
882 return 0;
883 }
884 dprintk("mpoa: (%s) msg_from_mpoad:", (mpc->dev) ? mpc->dev->name : "<unknown>");
885 switch(mesg->type) {
886 case MPOA_RES_REPLY_RCVD:
887 dprintk(" mpoa_res_reply_rcvd\n");
888 MPOA_res_reply_rcvd(mesg, mpc);
889 break;
890 case MPOA_TRIGGER_RCVD:
891 dprintk(" mpoa_trigger_rcvd\n");
892 MPOA_trigger_rcvd(mesg, mpc);
893 break;
894 case INGRESS_PURGE_RCVD:
895 dprintk(" nhrp_purge_rcvd\n");
896 ingress_purge_rcvd(mesg, mpc);
897 break;
898 case EGRESS_PURGE_RCVD:
899 dprintk(" egress_purge_reply_rcvd\n");
900 egress_purge_rcvd(mesg, mpc);
901 break;
902 case MPS_DEATH:
903 dprintk(" mps_death\n");
904 mps_death(mesg, mpc);
905 break;
906 case CACHE_IMPOS_RCVD:
907 dprintk(" cache_impos_rcvd\n");
908 MPOA_cache_impos_rcvd(mesg, mpc);
909 break;
910 case SET_MPC_CTRL_ADDR:
911 dprintk(" set_mpc_ctrl_addr\n");
912 set_mpc_ctrl_addr_rcvd(mesg, mpc);
913 break;
914 case SET_MPS_MAC_ADDR:
915 dprintk(" set_mps_mac_addr\n");
916 set_mps_mac_addr_rcvd(mesg, mpc);
917 break;
918 case CLEAN_UP_AND_EXIT:
919 dprintk(" clean_up_and_exit\n");
920 clean_up(mesg, mpc, DIE);
921 break;
922 case RELOAD:
923 dprintk(" reload\n");
924 clean_up(mesg, mpc, RELOAD);
925 break;
926 case SET_MPC_PARAMS:
927 dprintk(" set_mpc_params\n");
928 mpc->parameters = mesg->content.params;
929 break;
930 default:
931 dprintk(" unknown message %d\n", mesg->type);
932 break;
933 }
934 kfree_skb(skb);
935
936 return 0;
937 }
938
939 /* Remember that this function may not do things that sleep */
940 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
941 {
942 struct sk_buff *skb;
943 struct sock *sk;
944
945 if (mpc == NULL || !mpc->mpoad_vcc) {
946 printk("mpoa: msg_to_mpoad: mesg %d to a non-existent mpoad\n", mesg->type);
947 return -ENXIO;
948 }
949
950 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
951 if (skb == NULL)
952 return -ENOMEM;
953 skb_put(skb, sizeof(struct k_message));
954 memcpy(skb->data, mesg, sizeof(struct k_message));
955 atm_force_charge(mpc->mpoad_vcc, skb->truesize);
956
957 sk = sk_atm(mpc->mpoad_vcc);
958 skb_queue_tail(&sk->sk_receive_queue, skb);
959 sk->sk_data_ready(sk, skb->len);
960
961 return 0;
962 }
963
964 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev_ptr)
965 {
966 struct net_device *dev;
967 struct mpoa_client *mpc;
968 struct lec_priv *priv;
969
970 dev = (struct net_device *)dev_ptr;
971 if (dev->name == NULL || strncmp(dev->name, "lec", 3))
972 return NOTIFY_DONE; /* we are only interested in lec:s */
973
974 switch (event) {
975 case NETDEV_REGISTER: /* a new lec device was allocated */
976 priv = (struct lec_priv *)dev->priv;
977 if (priv->lane_version < 2)
978 break;
979 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
980 mpc = find_mpc_by_itfnum(priv->itfnum);
981 if (mpc == NULL) {
982 dprintk("mpoa: mpoa_event_listener: allocating new mpc for %s\n",
983 dev->name);
984 mpc = alloc_mpc();
985 if (mpc == NULL) {
986 printk("mpoa: mpoa_event_listener: no new mpc");
987 break;
988 }
989 }
990 mpc->dev_num = priv->itfnum;
991 mpc->dev = dev;
992 dev_hold(dev);
993 dprintk("mpoa: (%s) was initialized\n", dev->name);
994 break;
995 case NETDEV_UNREGISTER:
996 /* the lec device was deallocated */
997 mpc = find_mpc_by_lec(dev);
998 if (mpc == NULL)
999 break;
1000 dprintk("mpoa: device (%s) was deallocated\n", dev->name);
1001 stop_mpc(mpc);
1002 dev_put(mpc->dev);
1003 mpc->dev = NULL;
1004 break;
1005 case NETDEV_UP:
1006 /* the dev was ifconfig'ed up */
1007 mpc = find_mpc_by_lec(dev);
1008 if (mpc == NULL)
1009 break;
1010 if (mpc->mpoad_vcc != NULL) {
1011 start_mpc(mpc, dev);
1012 }
1013 break;
1014 case NETDEV_DOWN:
1015 /* the dev was ifconfig'ed down */
1016 /* this means that the flow of packets from the
1017 * upper layer stops
1018 */
1019 mpc = find_mpc_by_lec(dev);
1020 if (mpc == NULL)
1021 break;
1022 if (mpc->mpoad_vcc != NULL) {
1023 stop_mpc(mpc);
1024 }
1025 break;
1026 case NETDEV_REBOOT:
1027 case NETDEV_CHANGE:
1028 case NETDEV_CHANGEMTU:
1029 case NETDEV_CHANGEADDR:
1030 case NETDEV_GOING_DOWN:
1031 break;
1032 default:
1033 break;
1034 }
1035
1036 return NOTIFY_DONE;
1037 }
1038
1039 /*
1040 * Functions which are called after a message is received from mpcd.
1041 * Msg is reused on purpose.
1042 */
1043
1044
1045 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1046 {
1047 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1048 in_cache_entry *entry;
1049
1050 entry = mpc->in_ops->get(dst_ip, mpc);
1051 if(entry == NULL){
1052 entry = mpc->in_ops->add_entry(dst_ip, mpc);
1053 entry->entry_state = INGRESS_RESOLVING;
1054 msg->type = SND_MPOA_RES_RQST;
1055 msg->content.in_info = entry->ctrl_info;
1056 msg_to_mpoad(msg, mpc);
1057 do_gettimeofday(&(entry->reply_wait));
1058 mpc->in_ops->put(entry);
1059 return;
1060 }
1061
1062 if(entry->entry_state == INGRESS_INVALID){
1063 entry->entry_state = INGRESS_RESOLVING;
1064 msg->type = SND_MPOA_RES_RQST;
1065 msg->content.in_info = entry->ctrl_info;
1066 msg_to_mpoad(msg, mpc);
1067 do_gettimeofday(&(entry->reply_wait));
1068 mpc->in_ops->put(entry);
1069 return;
1070 }
1071
1072 printk("mpoa: (%s) MPOA_trigger_rcvd: entry already in resolving state\n",
1073 (mpc->dev) ? mpc->dev->name : "<unknown>");
1074 mpc->in_ops->put(entry);
1075 return;
1076 }
1077
1078 /*
1079 * Things get complicated because we have to check if there's an egress
1080 * shortcut with suitable traffic parameters we could use.
1081 */
1082 static void check_qos_and_open_shortcut(struct k_message *msg, struct mpoa_client *client, in_cache_entry *entry)
1083 {
1084 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1085 unsigned char *ip __attribute__ ((unused)) = (unsigned char *)&dst_ip;
1086 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1087 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1088
1089 if(eg_entry && eg_entry->shortcut){
1090 if(eg_entry->shortcut->qos.txtp.traffic_class &
1091 msg->qos.txtp.traffic_class &
1092 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)){
1093 if(eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1094 entry->shortcut = eg_entry->shortcut;
1095 else if(eg_entry->shortcut->qos.txtp.max_pcr > 0)
1096 entry->shortcut = eg_entry->shortcut;
1097 }
1098 if(entry->shortcut){
1099 dprintk("mpoa: (%s) using egress SVC to reach %u.%u.%u.%u\n",client->dev->name, NIPQUAD(ip));
1100 client->eg_ops->put(eg_entry);
1101 return;
1102 }
1103 }
1104 if (eg_entry != NULL)
1105 client->eg_ops->put(eg_entry);
1106
1107 /* No luck in the egress cache we must open an ingress SVC */
1108 msg->type = OPEN_INGRESS_SVC;
1109 if (qos && (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class))
1110 {
1111 msg->qos = qos->qos;
1112 printk("mpoa: (%s) trying to get a CBR shortcut\n",client->dev->name);
1113 }
1114 else memset(&msg->qos,0,sizeof(struct atm_qos));
1115 msg_to_mpoad(msg, client);
1116 return;
1117 }
1118
1119 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1120 {
1121 unsigned char *ip;
1122
1123 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1124 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1125 ip = (unsigned char *)&dst_ip;
1126 dprintk("mpoa: (%s) MPOA_res_reply_rcvd: ip %u.%u.%u.%u\n", mpc->dev->name, NIPQUAD(ip));
1127 ddprintk("mpoa: (%s) MPOA_res_reply_rcvd() entry = %p", mpc->dev->name, entry);
1128 if(entry == NULL){
1129 printk("\nmpoa: (%s) ARGH, received res. reply for an entry that doesn't exist.\n", mpc->dev->name);
1130 return;
1131 }
1132 ddprintk(" entry_state = %d ", entry->entry_state);
1133
1134 if (entry->entry_state == INGRESS_RESOLVED) {
1135 printk("\nmpoa: (%s) MPOA_res_reply_rcvd for RESOLVED entry!\n", mpc->dev->name);
1136 mpc->in_ops->put(entry);
1137 return;
1138 }
1139
1140 entry->ctrl_info = msg->content.in_info;
1141 do_gettimeofday(&(entry->tv));
1142 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1143 entry->refresh_time = 0;
1144 ddprintk("entry->shortcut = %p\n", entry->shortcut);
1145
1146 if(entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL){
1147 entry->entry_state = INGRESS_RESOLVED;
1148 mpc->in_ops->put(entry);
1149 return; /* Shortcut already open... */
1150 }
1151
1152 if (entry->shortcut != NULL) {
1153 printk("mpoa: (%s) MPOA_res_reply_rcvd: entry->shortcut != NULL, impossible!\n",
1154 mpc->dev->name);
1155 mpc->in_ops->put(entry);
1156 return;
1157 }
1158
1159 check_qos_and_open_shortcut(msg, mpc, entry);
1160 entry->entry_state = INGRESS_RESOLVED;
1161 mpc->in_ops->put(entry);
1162
1163 return;
1164
1165 }
1166
1167 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1168 {
1169 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1170 uint32_t mask = msg->ip_mask;
1171 unsigned char *ip = (unsigned char *)&dst_ip;
1172 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1173
1174 if(entry == NULL){
1175 printk("mpoa: (%s) ingress_purge_rcvd: purge for a non-existing entry, ", mpc->dev->name);
1176 printk("ip = %u.%u.%u.%u\n", ip[0], ip[1], ip[2], ip[3]);
1177 return;
1178 }
1179
1180 do {
1181 dprintk("mpoa: (%s) ingress_purge_rcvd: removing an ingress entry, ip = %u.%u.%u.%u\n" ,
1182 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
1183 write_lock_bh(&mpc->ingress_lock);
1184 mpc->in_ops->remove_entry(entry, mpc);
1185 write_unlock_bh(&mpc->ingress_lock);
1186 mpc->in_ops->put(entry);
1187 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1188 } while (entry != NULL);
1189
1190 return;
1191 }
1192
1193 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1194 {
1195 uint32_t cache_id = msg->content.eg_info.cache_id;
1196 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1197
1198 if (entry == NULL) {
1199 dprintk("mpoa: (%s) egress_purge_rcvd: purge for a non-existing entry\n", mpc->dev->name);
1200 return;
1201 }
1202
1203 write_lock_irq(&mpc->egress_lock);
1204 mpc->eg_ops->remove_entry(entry, mpc);
1205 write_unlock_irq(&mpc->egress_lock);
1206
1207 mpc->eg_ops->put(entry);
1208
1209 return;
1210 }
1211
1212 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
1213 {
1214 struct sock *sk;
1215 struct k_message *purge_msg;
1216 struct sk_buff *skb;
1217
1218 dprintk("mpoa: purge_egress_shortcut: entering\n");
1219 if (vcc == NULL) {
1220 printk("mpoa: purge_egress_shortcut: vcc == NULL\n");
1221 return;
1222 }
1223
1224 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
1225 if (skb == NULL) {
1226 printk("mpoa: purge_egress_shortcut: out of memory\n");
1227 return;
1228 }
1229
1230 skb_put(skb, sizeof(struct k_message));
1231 memset(skb->data, 0, sizeof(struct k_message));
1232 purge_msg = (struct k_message *)skb->data;
1233 purge_msg->type = DATA_PLANE_PURGE;
1234 if (entry != NULL)
1235 purge_msg->content.eg_info = entry->ctrl_info;
1236
1237 atm_force_charge(vcc, skb->truesize);
1238
1239 sk = sk_atm(vcc);
1240 skb_queue_tail(&sk->sk_receive_queue, skb);
1241 sk->sk_data_ready(sk, skb->len);
1242 dprintk("mpoa: purge_egress_shortcut: exiting:\n");
1243
1244 return;
1245 }
1246
1247 /*
1248 * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1249 * of the egress shortcuts we have.
1250 */
1251 static void mps_death( struct k_message * msg, struct mpoa_client * mpc )
1252 {
1253 eg_cache_entry *entry;
1254
1255 dprintk("mpoa: (%s) mps_death:\n", mpc->dev->name);
1256
1257 if(memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)){
1258 printk("mpoa: (%s) mps_death: wrong MPS\n", mpc->dev->name);
1259 return;
1260 }
1261
1262 /* FIXME: This knows too much of the cache structure */
1263 read_lock_irq(&mpc->egress_lock);
1264 entry = mpc->eg_cache;
1265 while (entry != NULL) {
1266 purge_egress_shortcut(entry->shortcut, entry);
1267 entry = entry->next;
1268 }
1269 read_unlock_irq(&mpc->egress_lock);
1270
1271 mpc->in_ops->destroy_cache(mpc);
1272 mpc->eg_ops->destroy_cache(mpc);
1273
1274 return;
1275 }
1276
1277 static void MPOA_cache_impos_rcvd( struct k_message * msg, struct mpoa_client * mpc)
1278 {
1279 uint16_t holding_time;
1280 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1281
1282 holding_time = msg->content.eg_info.holding_time;
1283 dprintk("mpoa: (%s) MPOA_cache_impos_rcvd: entry = %p, holding_time = %u\n",
1284 mpc->dev->name, entry, holding_time);
1285 if(entry == NULL && holding_time) {
1286 entry = mpc->eg_ops->add_entry(msg, mpc);
1287 mpc->eg_ops->put(entry);
1288 return;
1289 }
1290 if(holding_time){
1291 mpc->eg_ops->update(entry, holding_time);
1292 return;
1293 }
1294
1295 write_lock_irq(&mpc->egress_lock);
1296 mpc->eg_ops->remove_entry(entry, mpc);
1297 write_unlock_irq(&mpc->egress_lock);
1298
1299 mpc->eg_ops->put(entry);
1300
1301 return;
1302 }
1303
1304 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc)
1305 {
1306 struct lec_priv *priv;
1307 int i, retval ;
1308
1309 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1310
1311 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */
1312 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */
1313 tlv[5] = 0x02; /* MPOA client */
1314 tlv[6] = 0x00; /* number of MPS MAC addresses */
1315
1316 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1317 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1318
1319 dprintk("mpoa: (%s) setting MPC ctrl ATM address to ",
1320 (mpc->dev) ? mpc->dev->name : "<unknown>");
1321 for (i = 7; i < sizeof(tlv); i++)
1322 dprintk("%02x ", tlv[i]);
1323 dprintk("\n");
1324
1325 if (mpc->dev) {
1326 priv = (struct lec_priv *)mpc->dev->priv;
1327 retval = priv->lane2_ops->associate_req(mpc->dev, mpc->dev->dev_addr, tlv, sizeof(tlv));
1328 if (retval == 0)
1329 printk("mpoa: (%s) MPOA device type TLV association failed\n", mpc->dev->name);
1330 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1331 if (retval < 0)
1332 printk("mpoa: (%s) targetless LE_ARP request failed\n", mpc->dev->name);
1333 }
1334
1335 return;
1336 }
1337
1338 static void set_mps_mac_addr_rcvd(struct k_message *msg, struct mpoa_client *client)
1339 {
1340
1341 if(client->number_of_mps_macs)
1342 kfree(client->mps_macs);
1343 client->number_of_mps_macs = 0;
1344 client->mps_macs = kmalloc(ETH_ALEN,GFP_KERNEL);
1345 if (client->mps_macs == NULL) {
1346 printk("mpoa: set_mps_mac_addr_rcvd: out of memory\n");
1347 return;
1348 }
1349 client->number_of_mps_macs = 1;
1350 memcpy(client->mps_macs, msg->MPS_ctrl, ETH_ALEN);
1351
1352 return;
1353 }
1354
1355 /*
1356 * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1357 */
1358 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1359 {
1360
1361 eg_cache_entry *entry;
1362 msg->type = SND_EGRESS_PURGE;
1363
1364
1365 /* FIXME: This knows too much of the cache structure */
1366 read_lock_irq(&mpc->egress_lock);
1367 entry = mpc->eg_cache;
1368 while (entry != NULL){
1369 msg->content.eg_info = entry->ctrl_info;
1370 dprintk("mpoa: cache_id %u\n", entry->ctrl_info.cache_id);
1371 msg_to_mpoad(msg, mpc);
1372 entry = entry->next;
1373 }
1374 read_unlock_irq(&mpc->egress_lock);
1375
1376 msg->type = action;
1377 msg_to_mpoad(msg, mpc);
1378 return;
1379 }
1380
1381 static void mpc_timer_refresh(void)
1382 {
1383 mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1384 mpc_timer.data = mpc_timer.expires;
1385 mpc_timer.function = mpc_cache_check;
1386 add_timer(&mpc_timer);
1387
1388 return;
1389 }
1390
1391 static void mpc_cache_check( unsigned long checking_time )
1392 {
1393 struct mpoa_client *mpc = mpcs;
1394 static unsigned long previous_resolving_check_time;
1395 static unsigned long previous_refresh_time;
1396
1397 while( mpc != NULL ){
1398 mpc->in_ops->clear_count(mpc);
1399 mpc->eg_ops->clear_expired(mpc);
1400 if(checking_time - previous_resolving_check_time > mpc->parameters.mpc_p4 * HZ ){
1401 mpc->in_ops->check_resolving(mpc);
1402 previous_resolving_check_time = checking_time;
1403 }
1404 if(checking_time - previous_refresh_time > mpc->parameters.mpc_p5 * HZ ){
1405 mpc->in_ops->refresh(mpc);
1406 previous_refresh_time = checking_time;
1407 }
1408 mpc = mpc->next;
1409 }
1410 mpc_timer_refresh();
1411
1412 return;
1413 }
1414
1415 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1416 {
1417 int err = 0;
1418 struct atm_vcc *vcc = ATM_SD(sock);
1419
1420 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1421 return -ENOIOCTLCMD;
1422
1423 if (!capable(CAP_NET_ADMIN))
1424 return -EPERM;
1425
1426 switch (cmd) {
1427 case ATMMPC_CTRL:
1428 err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1429 if (err >= 0)
1430 sock->state = SS_CONNECTED;
1431 break;
1432 case ATMMPC_DATA:
1433 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1434 break;
1435 default:
1436 break;
1437 }
1438 return err;
1439 }
1440
1441
1442 static struct atm_ioctl atm_ioctl_ops = {
1443 .owner = THIS_MODULE,
1444 .ioctl = atm_mpoa_ioctl,
1445 };
1446
1447 static __init int atm_mpoa_init(void)
1448 {
1449 register_atm_ioctl(&atm_ioctl_ops);
1450
1451 #ifdef CONFIG_PROC_FS
1452 if (mpc_proc_init() != 0)
1453 printk(KERN_INFO "mpoa: failed to initialize /proc/mpoa\n");
1454 else
1455 printk(KERN_INFO "mpoa: /proc/mpoa initialized\n");
1456 #endif
1457
1458 printk("mpc.c: " __DATE__ " " __TIME__ " initialized\n");
1459
1460 return 0;
1461 }
1462
1463 static void __exit atm_mpoa_cleanup(void)
1464 {
1465 struct mpoa_client *mpc, *tmp;
1466 struct atm_mpoa_qos *qos, *nextqos;
1467 struct lec_priv *priv;
1468
1469 #ifdef CONFIG_PROC_FS
1470 mpc_proc_clean();
1471 #endif
1472
1473 del_timer(&mpc_timer);
1474 unregister_netdevice_notifier(&mpoa_notifier);
1475 deregister_atm_ioctl(&atm_ioctl_ops);
1476
1477 mpc = mpcs;
1478 mpcs = NULL;
1479 while (mpc != NULL) {
1480 tmp = mpc->next;
1481 if (mpc->dev != NULL) {
1482 stop_mpc(mpc);
1483 priv = (struct lec_priv *)mpc->dev->priv;
1484 if (priv->lane2_ops != NULL)
1485 priv->lane2_ops->associate_indicator = NULL;
1486 }
1487 ddprintk("mpoa: cleanup_module: about to clear caches\n");
1488 mpc->in_ops->destroy_cache(mpc);
1489 mpc->eg_ops->destroy_cache(mpc);
1490 ddprintk("mpoa: cleanup_module: caches cleared\n");
1491 kfree(mpc->mps_macs);
1492 memset(mpc, 0, sizeof(struct mpoa_client));
1493 ddprintk("mpoa: cleanup_module: about to kfree %p\n", mpc);
1494 kfree(mpc);
1495 ddprintk("mpoa: cleanup_module: next mpc is at %p\n", tmp);
1496 mpc = tmp;
1497 }
1498
1499 qos = qos_head;
1500 qos_head = NULL;
1501 while (qos != NULL) {
1502 nextqos = qos->next;
1503 dprintk("mpoa: cleanup_module: freeing qos entry %p\n", qos);
1504 kfree(qos);
1505 qos = nextqos;
1506 }
1507
1508 return;
1509 }
1510
1511 module_init(atm_mpoa_init);
1512 module_exit(atm_mpoa_cleanup);
1513
1514 MODULE_LICENSE("GPL");
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