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[PATCH] sys_mbind sanity checking
[linux-2.6/mini2440.git] / net / atm / mpc.c
blobc304ef1513b9bed3d8191af2224c97c50b394918
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/capability.h>
7 #include <linux/seq_file.h>
8
9 /* We are an ethernet device */
10 #include <linux/if_ether.h>
11 #include <linux/netdevice.h>
12 #include <linux/etherdevice.h>
13 #include <net/sock.h>
14 #include <linux/skbuff.h>
15 #include <linux/ip.h>
16 #include <asm/byteorder.h>
17 #include <asm/uaccess.h>
18 #include <net/checksum.h> /* for ip_fast_csum() */
19 #include <net/arp.h>
20 #include <net/dst.h>
21 #include <linux/proc_fs.h>
22
23 /* And atm device */
24 #include <linux/atmdev.h>
25 #include <linux/atmlec.h>
26 #include <linux/atmmpc.h>
27 /* Modular too */
28 #include <linux/config.h>
29 #include <linux/module.h>
30
31 #include "lec.h"
32 #include "mpc.h"
33 #include "resources.h"
34
35 /*
36 * mpc.c: Implementation of MPOA client kernel part
37 */
38
39 #if 0
40 #define dprintk printk /* debug */
41 #else
42 #define dprintk(format,args...)
43 #endif
44
45 #if 0
46 #define ddprintk printk /* more debug */
47 #else
48 #define ddprintk(format,args...)
49 #endif
50
51
52
53 #define MPOA_TAG_LEN 4
54
55 /* mpc_daemon -> kernel */
56 static void MPOA_trigger_rcvd (struct k_message *msg, struct mpoa_client *mpc);
57 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
58 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
59 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
60 static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
61 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action);
62 static void MPOA_cache_impos_rcvd(struct k_message *msg, struct mpoa_client *mpc);
63 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
64 static void set_mps_mac_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
65
66 static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
67 uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type);
68 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
69
70 static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc);
71 static void mpoad_close(struct atm_vcc *vcc);
72 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
73
74 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
75 static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev);
76 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev);
77 static void mpc_timer_refresh(void);
78 static void mpc_cache_check( unsigned long checking_time );
79
80 static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
81 0xaa, 0xaa, 0x03,
82 {0x00, 0x00, 0x5e},
83 {0x00, 0x03} /* For MPOA control PDUs */
84 };
85 static struct llc_snap_hdr llc_snap_mpoa_data = {
86 0xaa, 0xaa, 0x03,
87 {0x00, 0x00, 0x00},
88 {0x08, 0x00} /* This is for IP PDUs only */
89 };
90 static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
91 0xaa, 0xaa, 0x03,
92 {0x00, 0x00, 0x00},
93 {0x88, 0x4c} /* This is for tagged data PDUs */
94 };
95
96 static struct notifier_block mpoa_notifier = {
97 mpoa_event_listener,
98 NULL,
99 0
100 };
101
102 #ifdef CONFIG_PROC_FS
103 extern int mpc_proc_init(void);
104 extern void mpc_proc_clean(void);
105 #endif
106
107 struct mpoa_client *mpcs = NULL; /* FIXME */
108 static struct atm_mpoa_qos *qos_head = NULL;
109 static DEFINE_TIMER(mpc_timer, NULL, 0, 0);
110
111
112 static struct mpoa_client *find_mpc_by_itfnum(int itf)
113 {
114 struct mpoa_client *mpc;
115
116 mpc = mpcs; /* our global linked list */
117 while (mpc != NULL) {
118 if (mpc->dev_num == itf)
119 return mpc;
120 mpc = mpc->next;
121 }
122
123 return NULL; /* not found */
124 }
125
126 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
127 {
128 struct mpoa_client *mpc;
129
130 mpc = mpcs; /* our global linked list */
131 while (mpc != NULL) {
132 if (mpc->mpoad_vcc == vcc)
133 return mpc;
134 mpc = mpc->next;
135 }
136
137 return NULL; /* not found */
138 }
139
140 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
141 {
142 struct mpoa_client *mpc;
143
144 mpc = mpcs; /* our global linked list */
145 while (mpc != NULL) {
146 if (mpc->dev == dev)
147 return mpc;
148 mpc = mpc->next;
149 }
150
151 return NULL; /* not found */
152 }
153
154 /*
155 * Functions for managing QoS list
156 */
157
158 /*
159 * Overwrites the old entry or makes a new one.
160 */
161 struct atm_mpoa_qos *atm_mpoa_add_qos(uint32_t dst_ip, struct atm_qos *qos)
162 {
163 struct atm_mpoa_qos *entry;
164
165 entry = atm_mpoa_search_qos(dst_ip);
166 if (entry != NULL) {
167 entry->qos = *qos;
168 return entry;
169 }
170
171 entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
172 if (entry == NULL) {
173 printk("mpoa: atm_mpoa_add_qos: out of memory\n");
174 return entry;
175 }
176
177 entry->ipaddr = dst_ip;
178 entry->qos = *qos;
179
180 entry->next = qos_head;
181 qos_head = entry;
182
183 return entry;
184 }
185
186 struct atm_mpoa_qos *atm_mpoa_search_qos(uint32_t dst_ip)
187 {
188 struct atm_mpoa_qos *qos;
189
190 qos = qos_head;
191 while( qos != NULL ){
192 if(qos->ipaddr == dst_ip) {
193 break;
194 }
195 qos = qos->next;
196 }
197
198 return qos;
199 }
200
201 /*
202 * Returns 0 for failure
203 */
204 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
205 {
206
207 struct atm_mpoa_qos *curr;
208
209 if (entry == NULL) return 0;
210 if (entry == qos_head) {
211 qos_head = qos_head->next;
212 kfree(entry);
213 return 1;
214 }
215
216 curr = qos_head;
217 while (curr != NULL) {
218 if (curr->next == entry) {
219 curr->next = entry->next;
220 kfree(entry);
221 return 1;
222 }
223 curr = curr->next;
224 }
225
226 return 0;
227 }
228
229 /* this is buggered - we need locking for qos_head */
230 void atm_mpoa_disp_qos(struct seq_file *m)
231 {
232 unsigned char *ip;
233 char ipaddr[16];
234 struct atm_mpoa_qos *qos;
235
236 qos = qos_head;
237 seq_printf(m, "QoS entries for shortcuts:\n");
238 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");
239
240 ipaddr[sizeof(ipaddr)-1] = '\0';
241 while (qos != NULL) {
242 ip = (unsigned char *)&qos->ipaddr;
243 sprintf(ipaddr, "%u.%u.%u.%u", NIPQUAD(ip));
244 seq_printf(m, "%u.%u.%u.%u\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n",
245 NIPQUAD(ipaddr),
246 qos->qos.txtp.max_pcr, qos->qos.txtp.pcr, qos->qos.txtp.min_pcr, qos->qos.txtp.max_cdv, qos->qos.txtp.max_sdu,
247 qos->qos.rxtp.max_pcr, qos->qos.rxtp.pcr, qos->qos.rxtp.min_pcr, qos->qos.rxtp.max_cdv, qos->qos.rxtp.max_sdu);
248 qos = qos->next;
249 }
250 }
251
252 static struct net_device *find_lec_by_itfnum(int itf)
253 {
254 struct net_device *dev;
255 char name[IFNAMSIZ];
256
257 sprintf(name, "lec%d", itf);
258 dev = dev_get_by_name(name);
259
260 return dev;
261 }
262
263 static struct mpoa_client *alloc_mpc(void)
264 {
265 struct mpoa_client *mpc;
266
267 mpc = kmalloc(sizeof (struct mpoa_client), GFP_KERNEL);
268 if (mpc == NULL)
269 return NULL;
270 memset(mpc, 0, sizeof(struct mpoa_client));
271 rwlock_init(&mpc->ingress_lock);
272 rwlock_init(&mpc->egress_lock);
273 mpc->next = mpcs;
274 atm_mpoa_init_cache(mpc);
275
276 mpc->parameters.mpc_p1 = MPC_P1;
277 mpc->parameters.mpc_p2 = MPC_P2;
278 memset(mpc->parameters.mpc_p3,0,sizeof(mpc->parameters.mpc_p3));
279 mpc->parameters.mpc_p4 = MPC_P4;
280 mpc->parameters.mpc_p5 = MPC_P5;
281 mpc->parameters.mpc_p6 = MPC_P6;
282
283 mpcs = mpc;
284
285 return mpc;
286 }
287
288 /*
289 *
290 * start_mpc() puts the MPC on line. All the packets destined
291 * to the lec underneath us are now being monitored and
292 * shortcuts will be established.
293 *
294 */
295 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
296 {
297
298 dprintk("mpoa: (%s) start_mpc:\n", mpc->dev->name);
299 if (dev->hard_start_xmit == NULL) {
300 printk("mpoa: (%s) start_mpc: dev->hard_start_xmit == NULL, not starting\n",
301 dev->name);
302 return;
303 }
304 mpc->old_hard_start_xmit = dev->hard_start_xmit;
305 dev->hard_start_xmit = mpc_send_packet;
306
307 return;
308 }
309
310 static void stop_mpc(struct mpoa_client *mpc)
311 {
312
313 dprintk("mpoa: (%s) stop_mpc:", mpc->dev->name);
314
315 /* Lets not nullify lec device's dev->hard_start_xmit */
316 if (mpc->dev->hard_start_xmit != mpc_send_packet) {
317 dprintk(" mpc already stopped, not fatal\n");
318 return;
319 }
320 dprintk("\n");
321 mpc->dev->hard_start_xmit = mpc->old_hard_start_xmit;
322 mpc->old_hard_start_xmit = NULL;
323 /* close_shortcuts(mpc); ??? FIXME */
324
325 return;
326 }
327
328 static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
329
330 static const char *mpoa_device_type_string(char type)
331 {
332 switch(type) {
333 case NON_MPOA:
334 return "non-MPOA device";
335 break;
336 case MPS:
337 return "MPS";
338 break;
339 case MPC:
340 return "MPC";
341 break;
342 case MPS_AND_MPC:
343 return "both MPS and MPC";
344 break;
345 default:
346 return "unspecified (non-MPOA) device";
347 break;
348 }
349
350 return ""; /* not reached */
351 }
352
353 /*
354 * lec device calls this via its dev->priv->lane2_ops->associate_indicator()
355 * when it sees a TLV in LE_ARP packet.
356 * We fill in the pointer above when we see a LANE2 lec initializing
357 * See LANE2 spec 3.1.5
358 *
359 * Quite a big and ugly function but when you look at it
360 * all it does is to try to locate and parse MPOA Device
361 * Type TLV.
362 * We give our lec a pointer to this function and when the
363 * lec sees a TLV it uses the pointer to call this function.
364 *
365 */
366 static void lane2_assoc_ind(struct net_device *dev, uint8_t *mac_addr,
367 uint8_t *tlvs, uint32_t sizeoftlvs)
368 {
369 uint32_t type;
370 uint8_t length, mpoa_device_type, number_of_mps_macs;
371 uint8_t *end_of_tlvs;
372 struct mpoa_client *mpc;
373
374 mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
375 dprintk("mpoa: (%s) lane2_assoc_ind: received TLV(s), ", dev->name);
376 dprintk("total length of all TLVs %d\n", sizeoftlvs);
377 mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
378 if (mpc == NULL) {
379 printk("mpoa: (%s) lane2_assoc_ind: no mpc\n", dev->name);
380 return;
381 }
382 end_of_tlvs = tlvs + sizeoftlvs;
383 while (end_of_tlvs - tlvs >= 5) {
384 type = (tlvs[0] << 24) | (tlvs[1] << 16) | (tlvs[2] << 8) | tlvs[3];
385 length = tlvs[4];
386 tlvs += 5;
387 dprintk(" type 0x%x length %02x\n", type, length);
388 if (tlvs + length > end_of_tlvs) {
389 printk("TLV value extends past its buffer, aborting parse\n");
390 return;
391 }
392
393 if (type == 0) {
394 printk("mpoa: (%s) lane2_assoc_ind: TLV type was 0, returning\n", dev->name);
395 return;
396 }
397
398 if (type != TLV_MPOA_DEVICE_TYPE) {
399 tlvs += length;
400 continue; /* skip other TLVs */
401 }
402 mpoa_device_type = *tlvs++;
403 number_of_mps_macs = *tlvs++;
404 dprintk("mpoa: (%s) MPOA device type '%s', ", 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 printk("\nmpoa: (%s) lane2_assoc_ind: 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 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
414 dev->name);
415 continue;
416 }
417 if (mpoa_device_type != MPS && mpoa_device_type != MPS_AND_MPC) {
418 dprintk("ignoring non-MPS device\n");
419 if (mpoa_device_type == MPC) tlvs += 20;
420 continue; /* we are only interested in MPSs */
421 }
422 if (number_of_mps_macs == 0 && mpoa_device_type == MPS_AND_MPC) {
423 printk("\nmpoa: (%s) lane2_assoc_ind: MPS_AND_MPC has zero MACs\n", dev->name);
424 continue; /* someone should read the spec */
425 }
426 dprintk("this MPS has %d MAC addresses\n", number_of_mps_macs);
427
428 /* ok, now we can go and tell our daemon the control address of MPS */
429 send_set_mps_ctrl_addr(tlvs, mpc);
430
431 tlvs = copy_macs(mpc, mac_addr, tlvs, number_of_mps_macs, mpoa_device_type);
432 if (tlvs == NULL) return;
433 }
434 if (end_of_tlvs - tlvs != 0)
435 printk("mpoa: (%s) lane2_assoc_ind: ignoring %Zd bytes of trailing TLV carbage\n",
436 dev->name, end_of_tlvs - tlvs);
437 return;
438 }
439
440 /*
441 * Store at least advertizing router's MAC address
442 * plus the possible MAC address(es) to mpc->mps_macs.
443 * For a freshly allocated MPOA client mpc->mps_macs == 0.
444 */
445 static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
446 uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type)
447 {
448 int num_macs;
449 num_macs = (mps_macs > 1) ? mps_macs : 1;
450
451 if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
452 if (mpc->number_of_mps_macs != 0) kfree(mpc->mps_macs);
453 mpc->number_of_mps_macs = 0;
454 mpc->mps_macs = kmalloc(num_macs*ETH_ALEN, GFP_KERNEL);
455 if (mpc->mps_macs == NULL) {
456 printk("mpoa: (%s) copy_macs: out of mem\n", mpc->dev->name);
457 return NULL;
458 }
459 }
460 memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
461 tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
462 if (mps_macs > 0)
463 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
464 tlvs += mps_macs*ETH_ALEN;
465 mpc->number_of_mps_macs = num_macs;
466
467 return tlvs;
468 }
469
470 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
471 {
472 in_cache_entry *entry;
473 struct iphdr *iph;
474 char *buff;
475 uint32_t ipaddr = 0;
476
477 static struct {
478 struct llc_snap_hdr hdr;
479 uint32_t tag;
480 } tagged_llc_snap_hdr = {
481 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
482 0
483 };
484
485 buff = skb->data + mpc->dev->hard_header_len;
486 iph = (struct iphdr *)buff;
487 ipaddr = iph->daddr;
488
489 ddprintk("mpoa: (%s) send_via_shortcut: ipaddr 0x%x\n", mpc->dev->name, ipaddr);
490
491 entry = mpc->in_ops->get(ipaddr, mpc);
492 if (entry == NULL) {
493 entry = mpc->in_ops->add_entry(ipaddr, mpc);
494 if (entry != NULL) mpc->in_ops->put(entry);
495 return 1;
496 }
497 if (mpc->in_ops->cache_hit(entry, mpc) != OPEN){ /* threshold not exceeded or VCC not ready */
498 ddprintk("mpoa: (%s) send_via_shortcut: cache_hit: returns != OPEN\n", mpc->dev->name);
499 mpc->in_ops->put(entry);
500 return 1;
501 }
502
503 ddprintk("mpoa: (%s) send_via_shortcut: using shortcut\n", mpc->dev->name);
504 /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
505 if (iph->ttl <= 1) {
506 ddprintk("mpoa: (%s) send_via_shortcut: IP ttl = %u, using LANE\n", mpc->dev->name, iph->ttl);
507 mpc->in_ops->put(entry);
508 return 1;
509 }
510 iph->ttl--;
511 iph->check = 0;
512 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
513
514 if (entry->ctrl_info.tag != 0) {
515 ddprintk("mpoa: (%s) send_via_shortcut: adding tag 0x%x\n", mpc->dev->name, entry->ctrl_info.tag);
516 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
517 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
518 skb_push(skb, sizeof(tagged_llc_snap_hdr)); /* add LLC/SNAP header */
519 memcpy(skb->data, &tagged_llc_snap_hdr, sizeof(tagged_llc_snap_hdr));
520 } else {
521 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
522 skb_push(skb, sizeof(struct llc_snap_hdr)); /* add LLC/SNAP header + tag */
523 memcpy(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr));
524 }
525
526 atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
527 ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
528 entry->shortcut->send(entry->shortcut, skb);
529 entry->packets_fwded++;
530 mpc->in_ops->put(entry);
531
532 return 0;
533 }
534
535 /*
536 * Probably needs some error checks and locking, not sure...
537 */
538 static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev)
539 {
540 int retval;
541 struct mpoa_client *mpc;
542 struct ethhdr *eth;
543 int i = 0;
544
545 mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
546 if(mpc == NULL) {
547 printk("mpoa: (%s) mpc_send_packet: no MPC found\n", dev->name);
548 goto non_ip;
549 }
550
551 eth = (struct ethhdr *)skb->data;
552 if (eth->h_proto != htons(ETH_P_IP))
553 goto non_ip; /* Multi-Protocol Over ATM :-) */
554
555 while (i < mpc->number_of_mps_macs) {
556 if (!compare_ether_addr(eth->h_dest, (mpc->mps_macs + i*ETH_ALEN)))
557 if ( send_via_shortcut(skb, mpc) == 0 ) /* try shortcut */
558 return 0; /* success! */
559 i++;
560 }
561
562 non_ip:
563 retval = mpc->old_hard_start_xmit(skb,dev);
564
565 return retval;
566 }
567
568 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
569 {
570 int bytes_left;
571 struct mpoa_client *mpc;
572 struct atmmpc_ioc ioc_data;
573 in_cache_entry *in_entry;
574 uint32_t ipaddr;
575 unsigned char *ip;
576
577 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
578 if (bytes_left != 0) {
579 printk("mpoa: mpc_vcc_attach: Short read (missed %d bytes) from userland\n", bytes_left);
580 return -EFAULT;
581 }
582 ipaddr = ioc_data.ipaddr;
583 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
584 return -EINVAL;
585
586 mpc = find_mpc_by_itfnum(ioc_data.dev_num);
587 if (mpc == NULL)
588 return -EINVAL;
589
590 if (ioc_data.type == MPC_SOCKET_INGRESS) {
591 in_entry = mpc->in_ops->get(ipaddr, mpc);
592 if (in_entry == NULL || in_entry->entry_state < INGRESS_RESOLVED) {
593 printk("mpoa: (%s) mpc_vcc_attach: did not find RESOLVED entry from ingress cache\n",
594 mpc->dev->name);
595 if (in_entry != NULL) mpc->in_ops->put(in_entry);
596 return -EINVAL;
597 }
598 ip = (unsigned char*)&in_entry->ctrl_info.in_dst_ip;
599 printk("mpoa: (%s) mpc_vcc_attach: attaching ingress SVC, entry = %u.%u.%u.%u\n",
600 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
601 in_entry->shortcut = vcc;
602 mpc->in_ops->put(in_entry);
603 } else {
604 printk("mpoa: (%s) mpc_vcc_attach: attaching egress SVC\n", mpc->dev->name);
605 }
606
607 vcc->proto_data = mpc->dev;
608 vcc->push = mpc_push;
609
610 return 0;
611 }
612
613 /*
614 *
615 */
616 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
617 {
618 struct mpoa_client *mpc;
619 in_cache_entry *in_entry;
620 eg_cache_entry *eg_entry;
621
622 mpc = find_mpc_by_lec(dev);
623 if (mpc == NULL) {
624 printk("mpoa: (%s) mpc_vcc_close: close for unknown MPC\n", dev->name);
625 return;
626 }
627
628 dprintk("mpoa: (%s) mpc_vcc_close:\n", dev->name);
629 in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
630 if (in_entry) {
631 unsigned char *ip __attribute__ ((unused)) =
632 (unsigned char *)&in_entry->ctrl_info.in_dst_ip;
633 dprintk("mpoa: (%s) mpc_vcc_close: ingress SVC closed ip = %u.%u.%u.%u\n",
634 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
635 in_entry->shortcut = NULL;
636 mpc->in_ops->put(in_entry);
637 }
638 eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
639 if (eg_entry) {
640 dprintk("mpoa: (%s) mpc_vcc_close: egress SVC closed\n", mpc->dev->name);
641 eg_entry->shortcut = NULL;
642 mpc->eg_ops->put(eg_entry);
643 }
644
645 if (in_entry == NULL && eg_entry == NULL)
646 dprintk("mpoa: (%s) mpc_vcc_close: unused vcc closed\n", dev->name);
647
648 return;
649 }
650
651 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
652 {
653 struct net_device *dev = (struct net_device *)vcc->proto_data;
654 struct sk_buff *new_skb;
655 eg_cache_entry *eg;
656 struct mpoa_client *mpc;
657 uint32_t tag;
658 char *tmp;
659
660 ddprintk("mpoa: (%s) mpc_push:\n", dev->name);
661 if (skb == NULL) {
662 dprintk("mpoa: (%s) mpc_push: null skb, closing VCC\n", dev->name);
663 mpc_vcc_close(vcc, dev);
664 return;
665 }
666
667 skb->dev = dev;
668 if (memcmp(skb->data, &llc_snap_mpoa_ctrl, sizeof(struct llc_snap_hdr)) == 0) {
669 struct sock *sk = sk_atm(vcc);
670
671 dprintk("mpoa: (%s) mpc_push: control packet arrived\n", dev->name);
672 /* Pass control packets to daemon */
673 skb_queue_tail(&sk->sk_receive_queue, skb);
674 sk->sk_data_ready(sk, skb->len);
675 return;
676 }
677
678 /* data coming over the shortcut */
679 atm_return(vcc, skb->truesize);
680
681 mpc = find_mpc_by_lec(dev);
682 if (mpc == NULL) {
683 printk("mpoa: (%s) mpc_push: unknown MPC\n", dev->name);
684 return;
685 }
686
687 if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
688 ddprintk("mpoa: (%s) mpc_push: tagged data packet arrived\n", dev->name);
689
690 } else if (memcmp(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
691 printk("mpoa: (%s) mpc_push: non-tagged data packet arrived\n", dev->name);
692 printk(" mpc_push: non-tagged data unsupported, purging\n");
693 dev_kfree_skb_any(skb);
694 return;
695 } else {
696 printk("mpoa: (%s) mpc_push: garbage arrived, purging\n", dev->name);
697 dev_kfree_skb_any(skb);
698 return;
699 }
700
701 tmp = skb->data + sizeof(struct llc_snap_hdr);
702 tag = *(uint32_t *)tmp;
703
704 eg = mpc->eg_ops->get_by_tag(tag, mpc);
705 if (eg == NULL) {
706 printk("mpoa: (%s) mpc_push: Didn't find egress cache entry, tag = %u\n",
707 dev->name,tag);
708 purge_egress_shortcut(vcc, NULL);
709 dev_kfree_skb_any(skb);
710 return;
711 }
712
713 /*
714 * See if ingress MPC is using shortcut we opened as a return channel.
715 * This means we have a bi-directional vcc opened by us.
716 */
717 if (eg->shortcut == NULL) {
718 eg->shortcut = vcc;
719 printk("mpoa: (%s) mpc_push: egress SVC in use\n", dev->name);
720 }
721
722 skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); /* get rid of LLC/SNAP header */
723 new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); /* LLC/SNAP is shorter than MAC header :( */
724 dev_kfree_skb_any(skb);
725 if (new_skb == NULL){
726 mpc->eg_ops->put(eg);
727 return;
728 }
729 skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */
730 memcpy(new_skb->data, eg->ctrl_info.DLL_header, eg->ctrl_info.DH_length);
731 new_skb->protocol = eth_type_trans(new_skb, dev);
732 new_skb->nh.raw = new_skb->data;
733
734 eg->latest_ip_addr = new_skb->nh.iph->saddr;
735 eg->packets_rcvd++;
736 mpc->eg_ops->put(eg);
737
738 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
739 netif_rx(new_skb);
740
741 return;
742 }
743
744 static struct atmdev_ops mpc_ops = { /* only send is required */
745 .close = mpoad_close,
746 .send = msg_from_mpoad
747 };
748
749 static struct atm_dev mpc_dev = {
750 .ops = &mpc_ops,
751 .type = "mpc",
752 .number = 42,
753 .lock = SPIN_LOCK_UNLOCKED
754 /* members not explicitly initialised will be 0 */
755 };
756
757 static int atm_mpoa_mpoad_attach (struct atm_vcc *vcc, int arg)
758 {
759 struct mpoa_client *mpc;
760 struct lec_priv *priv;
761 int err;
762
763 if (mpcs == NULL) {
764 init_timer(&mpc_timer);
765 mpc_timer_refresh();
766
767 /* This lets us now how our LECs are doing */
768 err = register_netdevice_notifier(&mpoa_notifier);
769 if (err < 0) {
770 del_timer(&mpc_timer);
771 return err;
772 }
773 }
774
775 mpc = find_mpc_by_itfnum(arg);
776 if (mpc == NULL) {
777 dprintk("mpoa: mpoad_attach: allocating new mpc for itf %d\n", arg);
778 mpc = alloc_mpc();
779 if (mpc == NULL)
780 return -ENOMEM;
781 mpc->dev_num = arg;
782 mpc->dev = find_lec_by_itfnum(arg); /* NULL if there was no lec */
783 }
784 if (mpc->mpoad_vcc) {
785 printk("mpoa: mpoad_attach: mpoad is already present for itf %d\n", arg);
786 return -EADDRINUSE;
787 }
788
789 if (mpc->dev) { /* check if the lec is LANE2 capable */
790 priv = (struct lec_priv *)mpc->dev->priv;
791 if (priv->lane_version < 2) {
792 dev_put(mpc->dev);
793 mpc->dev = NULL;
794 } else
795 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
796 }
797
798 mpc->mpoad_vcc = vcc;
799 vcc->dev = &mpc_dev;
800 vcc_insert_socket(sk_atm(vcc));
801 set_bit(ATM_VF_META,&vcc->flags);
802 set_bit(ATM_VF_READY,&vcc->flags);
803
804 if (mpc->dev) {
805 char empty[ATM_ESA_LEN];
806 memset(empty, 0, ATM_ESA_LEN);
807
808 start_mpc(mpc, mpc->dev);
809 /* set address if mpcd e.g. gets killed and restarted.
810 * If we do not do it now we have to wait for the next LE_ARP
811 */
812 if ( memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0 )
813 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
814 }
815
816 __module_get(THIS_MODULE);
817 return arg;
818 }
819
820 static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc)
821 {
822 struct k_message mesg;
823
824 memcpy (mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
825
826 mesg.type = SET_MPS_CTRL_ADDR;
827 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
828 msg_to_mpoad(&mesg, mpc);
829
830 return;
831 }
832
833 static void mpoad_close(struct atm_vcc *vcc)
834 {
835 struct mpoa_client *mpc;
836 struct sk_buff *skb;
837
838 mpc = find_mpc_by_vcc(vcc);
839 if (mpc == NULL) {
840 printk("mpoa: mpoad_close: did not find MPC\n");
841 return;
842 }
843 if (!mpc->mpoad_vcc) {
844 printk("mpoa: mpoad_close: close for non-present mpoad\n");
845 return;
846 }
847
848 mpc->mpoad_vcc = NULL;
849 if (mpc->dev) {
850 struct lec_priv *priv = (struct lec_priv *)mpc->dev->priv;
851 priv->lane2_ops->associate_indicator = NULL;
852 stop_mpc(mpc);
853 dev_put(mpc->dev);
854 }
855
856 mpc->in_ops->destroy_cache(mpc);
857 mpc->eg_ops->destroy_cache(mpc);
858
859 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
860 atm_return(vcc, skb->truesize);
861 kfree_skb(skb);
862 }
863
864 printk("mpoa: (%s) going down\n",
865 (mpc->dev) ? mpc->dev->name : "<unknown>");
866 module_put(THIS_MODULE);
867
868 return;
869 }
870
871 /*
872 *
873 */
874 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
875 {
876
877 struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
878 struct k_message *mesg = (struct k_message*)skb->data;
879 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
880
881 if (mpc == NULL) {
882 printk("mpoa: msg_from_mpoad: no mpc found\n");
883 return 0;
884 }
885 dprintk("mpoa: (%s) msg_from_mpoad:", (mpc->dev) ? mpc->dev->name : "<unknown>");
886 switch(mesg->type) {
887 case MPOA_RES_REPLY_RCVD:
888 dprintk(" mpoa_res_reply_rcvd\n");
889 MPOA_res_reply_rcvd(mesg, mpc);
890 break;
891 case MPOA_TRIGGER_RCVD:
892 dprintk(" mpoa_trigger_rcvd\n");
893 MPOA_trigger_rcvd(mesg, mpc);
894 break;
895 case INGRESS_PURGE_RCVD:
896 dprintk(" nhrp_purge_rcvd\n");
897 ingress_purge_rcvd(mesg, mpc);
898 break;
899 case EGRESS_PURGE_RCVD:
900 dprintk(" egress_purge_reply_rcvd\n");
901 egress_purge_rcvd(mesg, mpc);
902 break;
903 case MPS_DEATH:
904 dprintk(" mps_death\n");
905 mps_death(mesg, mpc);
906 break;
907 case CACHE_IMPOS_RCVD:
908 dprintk(" cache_impos_rcvd\n");
909 MPOA_cache_impos_rcvd(mesg, mpc);
910 break;
911 case SET_MPC_CTRL_ADDR:
912 dprintk(" set_mpc_ctrl_addr\n");
913 set_mpc_ctrl_addr_rcvd(mesg, mpc);
914 break;
915 case SET_MPS_MAC_ADDR:
916 dprintk(" set_mps_mac_addr\n");
917 set_mps_mac_addr_rcvd(mesg, mpc);
918 break;
919 case CLEAN_UP_AND_EXIT:
920 dprintk(" clean_up_and_exit\n");
921 clean_up(mesg, mpc, DIE);
922 break;
923 case RELOAD:
924 dprintk(" reload\n");
925 clean_up(mesg, mpc, RELOAD);
926 break;
927 case SET_MPC_PARAMS:
928 dprintk(" set_mpc_params\n");
929 mpc->parameters = mesg->content.params;
930 break;
931 default:
932 dprintk(" unknown message %d\n", mesg->type);
933 break;
934 }
935 kfree_skb(skb);
936
937 return 0;
938 }
939
940 /* Remember that this function may not do things that sleep */
941 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
942 {
943 struct sk_buff *skb;
944 struct sock *sk;
945
946 if (mpc == NULL || !mpc->mpoad_vcc) {
947 printk("mpoa: msg_to_mpoad: mesg %d to a non-existent mpoad\n", mesg->type);
948 return -ENXIO;
949 }
950
951 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
952 if (skb == NULL)
953 return -ENOMEM;
954 skb_put(skb, sizeof(struct k_message));
955 memcpy(skb->data, mesg, sizeof(struct k_message));
956 atm_force_charge(mpc->mpoad_vcc, skb->truesize);
957
958 sk = sk_atm(mpc->mpoad_vcc);
959 skb_queue_tail(&sk->sk_receive_queue, skb);
960 sk->sk_data_ready(sk, skb->len);
961
962 return 0;
963 }
964
965 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev_ptr)
966 {
967 struct net_device *dev;
968 struct mpoa_client *mpc;
969 struct lec_priv *priv;
970
971 dev = (struct net_device *)dev_ptr;
972 if (dev->name == NULL || strncmp(dev->name, "lec", 3))
973 return NOTIFY_DONE; /* we are only interested in lec:s */
974
975 switch (event) {
976 case NETDEV_REGISTER: /* a new lec device was allocated */
977 priv = (struct lec_priv *)dev->priv;
978 if (priv->lane_version < 2)
979 break;
980 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
981 mpc = find_mpc_by_itfnum(priv->itfnum);
982 if (mpc == NULL) {
983 dprintk("mpoa: mpoa_event_listener: allocating new mpc for %s\n",
984 dev->name);
985 mpc = alloc_mpc();
986 if (mpc == NULL) {
987 printk("mpoa: mpoa_event_listener: no new mpc");
988 break;
989 }
990 }
991 mpc->dev_num = priv->itfnum;
992 mpc->dev = dev;
993 dev_hold(dev);
994 dprintk("mpoa: (%s) was initialized\n", dev->name);
995 break;
996 case NETDEV_UNREGISTER:
997 /* the lec device was deallocated */
998 mpc = find_mpc_by_lec(dev);
999 if (mpc == NULL)
1000 break;
1001 dprintk("mpoa: device (%s) was deallocated\n", dev->name);
1002 stop_mpc(mpc);
1003 dev_put(mpc->dev);
1004 mpc->dev = NULL;
1005 break;
1006 case NETDEV_UP:
1007 /* the dev was ifconfig'ed up */
1008 mpc = find_mpc_by_lec(dev);
1009 if (mpc == NULL)
1010 break;
1011 if (mpc->mpoad_vcc != NULL) {
1012 start_mpc(mpc, dev);
1013 }
1014 break;
1015 case NETDEV_DOWN:
1016 /* the dev was ifconfig'ed down */
1017 /* this means that the flow of packets from the
1018 * upper layer stops
1019 */
1020 mpc = find_mpc_by_lec(dev);
1021 if (mpc == NULL)
1022 break;
1023 if (mpc->mpoad_vcc != NULL) {
1024 stop_mpc(mpc);
1025 }
1026 break;
1027 case NETDEV_REBOOT:
1028 case NETDEV_CHANGE:
1029 case NETDEV_CHANGEMTU:
1030 case NETDEV_CHANGEADDR:
1031 case NETDEV_GOING_DOWN:
1032 break;
1033 default:
1034 break;
1035 }
1036
1037 return NOTIFY_DONE;
1038 }
1039
1040 /*
1041 * Functions which are called after a message is received from mpcd.
1042 * Msg is reused on purpose.
1043 */
1044
1045
1046 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1047 {
1048 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1049 in_cache_entry *entry;
1050
1051 entry = mpc->in_ops->get(dst_ip, mpc);
1052 if(entry == NULL){
1053 entry = mpc->in_ops->add_entry(dst_ip, mpc);
1054 entry->entry_state = INGRESS_RESOLVING;
1055 msg->type = SND_MPOA_RES_RQST;
1056 msg->content.in_info = entry->ctrl_info;
1057 msg_to_mpoad(msg, mpc);
1058 do_gettimeofday(&(entry->reply_wait));
1059 mpc->in_ops->put(entry);
1060 return;
1061 }
1062
1063 if(entry->entry_state == INGRESS_INVALID){
1064 entry->entry_state = INGRESS_RESOLVING;
1065 msg->type = SND_MPOA_RES_RQST;
1066 msg->content.in_info = entry->ctrl_info;
1067 msg_to_mpoad(msg, mpc);
1068 do_gettimeofday(&(entry->reply_wait));
1069 mpc->in_ops->put(entry);
1070 return;
1071 }
1072
1073 printk("mpoa: (%s) MPOA_trigger_rcvd: entry already in resolving state\n",
1074 (mpc->dev) ? mpc->dev->name : "<unknown>");
1075 mpc->in_ops->put(entry);
1076 return;
1077 }
1078
1079 /*
1080 * Things get complicated because we have to check if there's an egress
1081 * shortcut with suitable traffic parameters we could use.
1082 */
1083 static void check_qos_and_open_shortcut(struct k_message *msg, struct mpoa_client *client, in_cache_entry *entry)
1084 {
1085 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1086 unsigned char *ip __attribute__ ((unused)) = (unsigned char *)&dst_ip;
1087 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1088 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1089
1090 if(eg_entry && eg_entry->shortcut){
1091 if(eg_entry->shortcut->qos.txtp.traffic_class &
1092 msg->qos.txtp.traffic_class &
1093 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)){
1094 if(eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1095 entry->shortcut = eg_entry->shortcut;
1096 else if(eg_entry->shortcut->qos.txtp.max_pcr > 0)
1097 entry->shortcut = eg_entry->shortcut;
1098 }
1099 if(entry->shortcut){
1100 dprintk("mpoa: (%s) using egress SVC to reach %u.%u.%u.%u\n",client->dev->name, NIPQUAD(ip));
1101 client->eg_ops->put(eg_entry);
1102 return;
1103 }
1104 }
1105 if (eg_entry != NULL)
1106 client->eg_ops->put(eg_entry);
1107
1108 /* No luck in the egress cache we must open an ingress SVC */
1109 msg->type = OPEN_INGRESS_SVC;
1110 if (qos && (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class))
1111 {
1112 msg->qos = qos->qos;
1113 printk("mpoa: (%s) trying to get a CBR shortcut\n",client->dev->name);
1114 }
1115 else memset(&msg->qos,0,sizeof(struct atm_qos));
1116 msg_to_mpoad(msg, client);
1117 return;
1118 }
1119
1120 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1121 {
1122 unsigned char *ip;
1123
1124 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1125 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1126 ip = (unsigned char *)&dst_ip;
1127 dprintk("mpoa: (%s) MPOA_res_reply_rcvd: ip %u.%u.%u.%u\n", mpc->dev->name, NIPQUAD(ip));
1128 ddprintk("mpoa: (%s) MPOA_res_reply_rcvd() entry = %p", mpc->dev->name, entry);
1129 if(entry == NULL){
1130 printk("\nmpoa: (%s) ARGH, received res. reply for an entry that doesn't exist.\n", mpc->dev->name);
1131 return;
1132 }
1133 ddprintk(" entry_state = %d ", entry->entry_state);
1134
1135 if (entry->entry_state == INGRESS_RESOLVED) {
1136 printk("\nmpoa: (%s) MPOA_res_reply_rcvd for RESOLVED entry!\n", mpc->dev->name);
1137 mpc->in_ops->put(entry);
1138 return;
1139 }
1140
1141 entry->ctrl_info = msg->content.in_info;
1142 do_gettimeofday(&(entry->tv));
1143 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1144 entry->refresh_time = 0;
1145 ddprintk("entry->shortcut = %p\n", entry->shortcut);
1146
1147 if(entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL){
1148 entry->entry_state = INGRESS_RESOLVED;
1149 mpc->in_ops->put(entry);
1150 return; /* Shortcut already open... */
1151 }
1152
1153 if (entry->shortcut != NULL) {
1154 printk("mpoa: (%s) MPOA_res_reply_rcvd: entry->shortcut != NULL, impossible!\n",
1155 mpc->dev->name);
1156 mpc->in_ops->put(entry);
1157 return;
1158 }
1159
1160 check_qos_and_open_shortcut(msg, mpc, entry);
1161 entry->entry_state = INGRESS_RESOLVED;
1162 mpc->in_ops->put(entry);
1163
1164 return;
1165
1166 }
1167
1168 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1169 {
1170 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1171 uint32_t mask = msg->ip_mask;
1172 unsigned char *ip = (unsigned char *)&dst_ip;
1173 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1174
1175 if(entry == NULL){
1176 printk("mpoa: (%s) ingress_purge_rcvd: purge for a non-existing entry, ", mpc->dev->name);
1177 printk("ip = %u.%u.%u.%u\n", ip[0], ip[1], ip[2], ip[3]);
1178 return;
1179 }
1180
1181 do {
1182 dprintk("mpoa: (%s) ingress_purge_rcvd: removing an ingress entry, ip = %u.%u.%u.%u\n" ,
1183 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
1184 write_lock_bh(&mpc->ingress_lock);
1185 mpc->in_ops->remove_entry(entry, mpc);
1186 write_unlock_bh(&mpc->ingress_lock);
1187 mpc->in_ops->put(entry);
1188 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1189 } while (entry != NULL);
1190
1191 return;
1192 }
1193
1194 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1195 {
1196 uint32_t cache_id = msg->content.eg_info.cache_id;
1197 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1198
1199 if (entry == NULL) {
1200 dprintk("mpoa: (%s) egress_purge_rcvd: purge for a non-existing entry\n", mpc->dev->name);
1201 return;
1202 }
1203
1204 write_lock_irq(&mpc->egress_lock);
1205 mpc->eg_ops->remove_entry(entry, mpc);
1206 write_unlock_irq(&mpc->egress_lock);
1207
1208 mpc->eg_ops->put(entry);
1209
1210 return;
1211 }
1212
1213 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
1214 {
1215 struct sock *sk;
1216 struct k_message *purge_msg;
1217 struct sk_buff *skb;
1218
1219 dprintk("mpoa: purge_egress_shortcut: entering\n");
1220 if (vcc == NULL) {
1221 printk("mpoa: purge_egress_shortcut: vcc == NULL\n");
1222 return;
1223 }
1224
1225 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
1226 if (skb == NULL) {
1227 printk("mpoa: purge_egress_shortcut: out of memory\n");
1228 return;
1229 }
1230
1231 skb_put(skb, sizeof(struct k_message));
1232 memset(skb->data, 0, sizeof(struct k_message));
1233 purge_msg = (struct k_message *)skb->data;
1234 purge_msg->type = DATA_PLANE_PURGE;
1235 if (entry != NULL)
1236 purge_msg->content.eg_info = entry->ctrl_info;
1237
1238 atm_force_charge(vcc, skb->truesize);
1239
1240 sk = sk_atm(vcc);
1241 skb_queue_tail(&sk->sk_receive_queue, skb);
1242 sk->sk_data_ready(sk, skb->len);
1243 dprintk("mpoa: purge_egress_shortcut: exiting:\n");
1244
1245 return;
1246 }
1247
1248 /*
1249 * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1250 * of the egress shortcuts we have.
1251 */
1252 static void mps_death( struct k_message * msg, struct mpoa_client * mpc )
1253 {
1254 eg_cache_entry *entry;
1255
1256 dprintk("mpoa: (%s) mps_death:\n", mpc->dev->name);
1257
1258 if(memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)){
1259 printk("mpoa: (%s) mps_death: wrong MPS\n", mpc->dev->name);
1260 return;
1261 }
1262
1263 /* FIXME: This knows too much of the cache structure */
1264 read_lock_irq(&mpc->egress_lock);
1265 entry = mpc->eg_cache;
1266 while (entry != NULL) {
1267 purge_egress_shortcut(entry->shortcut, entry);
1268 entry = entry->next;
1269 }
1270 read_unlock_irq(&mpc->egress_lock);
1271
1272 mpc->in_ops->destroy_cache(mpc);
1273 mpc->eg_ops->destroy_cache(mpc);
1274
1275 return;
1276 }
1277
1278 static void MPOA_cache_impos_rcvd( struct k_message * msg, struct mpoa_client * mpc)
1279 {
1280 uint16_t holding_time;
1281 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1282
1283 holding_time = msg->content.eg_info.holding_time;
1284 dprintk("mpoa: (%s) MPOA_cache_impos_rcvd: entry = %p, holding_time = %u\n",
1285 mpc->dev->name, entry, holding_time);
1286 if(entry == NULL && holding_time) {
1287 entry = mpc->eg_ops->add_entry(msg, mpc);
1288 mpc->eg_ops->put(entry);
1289 return;
1290 }
1291 if(holding_time){
1292 mpc->eg_ops->update(entry, holding_time);
1293 return;
1294 }
1295
1296 write_lock_irq(&mpc->egress_lock);
1297 mpc->eg_ops->remove_entry(entry, mpc);
1298 write_unlock_irq(&mpc->egress_lock);
1299
1300 mpc->eg_ops->put(entry);
1301
1302 return;
1303 }
1304
1305 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc)
1306 {
1307 struct lec_priv *priv;
1308 int i, retval ;
1309
1310 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1311
1312 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */
1313 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */
1314 tlv[5] = 0x02; /* MPOA client */
1315 tlv[6] = 0x00; /* number of MPS MAC addresses */
1316
1317 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1318 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1319
1320 dprintk("mpoa: (%s) setting MPC ctrl ATM address to ",
1321 (mpc->dev) ? mpc->dev->name : "<unknown>");
1322 for (i = 7; i < sizeof(tlv); i++)
1323 dprintk("%02x ", tlv[i]);
1324 dprintk("\n");
1325
1326 if (mpc->dev) {
1327 priv = (struct lec_priv *)mpc->dev->priv;
1328 retval = priv->lane2_ops->associate_req(mpc->dev, mpc->dev->dev_addr, tlv, sizeof(tlv));
1329 if (retval == 0)
1330 printk("mpoa: (%s) MPOA device type TLV association failed\n", mpc->dev->name);
1331 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1332 if (retval < 0)
1333 printk("mpoa: (%s) targetless LE_ARP request failed\n", mpc->dev->name);
1334 }
1335
1336 return;
1337 }
1338
1339 static void set_mps_mac_addr_rcvd(struct k_message *msg, struct mpoa_client *client)
1340 {
1341
1342 if(client->number_of_mps_macs)
1343 kfree(client->mps_macs);
1344 client->number_of_mps_macs = 0;
1345 client->mps_macs = kmalloc(ETH_ALEN,GFP_KERNEL);
1346 if (client->mps_macs == NULL) {
1347 printk("mpoa: set_mps_mac_addr_rcvd: out of memory\n");
1348 return;
1349 }
1350 client->number_of_mps_macs = 1;
1351 memcpy(client->mps_macs, msg->MPS_ctrl, ETH_ALEN);
1352
1353 return;
1354 }
1355
1356 /*
1357 * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1358 */
1359 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1360 {
1361
1362 eg_cache_entry *entry;
1363 msg->type = SND_EGRESS_PURGE;
1364
1365
1366 /* FIXME: This knows too much of the cache structure */
1367 read_lock_irq(&mpc->egress_lock);
1368 entry = mpc->eg_cache;
1369 while (entry != NULL){
1370 msg->content.eg_info = entry->ctrl_info;
1371 dprintk("mpoa: cache_id %u\n", entry->ctrl_info.cache_id);
1372 msg_to_mpoad(msg, mpc);
1373 entry = entry->next;
1374 }
1375 read_unlock_irq(&mpc->egress_lock);
1376
1377 msg->type = action;
1378 msg_to_mpoad(msg, mpc);
1379 return;
1380 }
1381
1382 static void mpc_timer_refresh(void)
1383 {
1384 mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1385 mpc_timer.data = mpc_timer.expires;
1386 mpc_timer.function = mpc_cache_check;
1387 add_timer(&mpc_timer);
1388
1389 return;
1390 }
1391
1392 static void mpc_cache_check( unsigned long checking_time )
1393 {
1394 struct mpoa_client *mpc = mpcs;
1395 static unsigned long previous_resolving_check_time;
1396 static unsigned long previous_refresh_time;
1397
1398 while( mpc != NULL ){
1399 mpc->in_ops->clear_count(mpc);
1400 mpc->eg_ops->clear_expired(mpc);
1401 if(checking_time - previous_resolving_check_time > mpc->parameters.mpc_p4 * HZ ){
1402 mpc->in_ops->check_resolving(mpc);
1403 previous_resolving_check_time = checking_time;
1404 }
1405 if(checking_time - previous_refresh_time > mpc->parameters.mpc_p5 * HZ ){
1406 mpc->in_ops->refresh(mpc);
1407 previous_refresh_time = checking_time;
1408 }
1409 mpc = mpc->next;
1410 }
1411 mpc_timer_refresh();
1412
1413 return;
1414 }
1415
1416 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1417 {
1418 int err = 0;
1419 struct atm_vcc *vcc = ATM_SD(sock);
1420
1421 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1422 return -ENOIOCTLCMD;
1423
1424 if (!capable(CAP_NET_ADMIN))
1425 return -EPERM;
1426
1427 switch (cmd) {
1428 case ATMMPC_CTRL:
1429 err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1430 if (err >= 0)
1431 sock->state = SS_CONNECTED;
1432 break;
1433 case ATMMPC_DATA:
1434 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1435 break;
1436 default:
1437 break;
1438 }
1439 return err;
1440 }
1441
1442
1443 static struct atm_ioctl atm_ioctl_ops = {
1444 .owner = THIS_MODULE,
1445 .ioctl = atm_mpoa_ioctl,
1446 };
1447
1448 static __init int atm_mpoa_init(void)
1449 {
1450 register_atm_ioctl(&atm_ioctl_ops);
1451
1452 #ifdef CONFIG_PROC_FS
1453 if (mpc_proc_init() != 0)
1454 printk(KERN_INFO "mpoa: failed to initialize /proc/mpoa\n");
1455 else
1456 printk(KERN_INFO "mpoa: /proc/mpoa initialized\n");
1457 #endif
1458
1459 printk("mpc.c: " __DATE__ " " __TIME__ " initialized\n");
1460
1461 return 0;
1462 }
1463
1464 static void __exit atm_mpoa_cleanup(void)
1465 {
1466 struct mpoa_client *mpc, *tmp;
1467 struct atm_mpoa_qos *qos, *nextqos;
1468 struct lec_priv *priv;
1469
1470 #ifdef CONFIG_PROC_FS
1471 mpc_proc_clean();
1472 #endif
1473
1474 del_timer(&mpc_timer);
1475 unregister_netdevice_notifier(&mpoa_notifier);
1476 deregister_atm_ioctl(&atm_ioctl_ops);
1477
1478 mpc = mpcs;
1479 mpcs = NULL;
1480 while (mpc != NULL) {
1481 tmp = mpc->next;
1482 if (mpc->dev != NULL) {
1483 stop_mpc(mpc);
1484 priv = (struct lec_priv *)mpc->dev->priv;
1485 if (priv->lane2_ops != NULL)
1486 priv->lane2_ops->associate_indicator = NULL;
1487 }
1488 ddprintk("mpoa: cleanup_module: about to clear caches\n");
1489 mpc->in_ops->destroy_cache(mpc);
1490 mpc->eg_ops->destroy_cache(mpc);
1491 ddprintk("mpoa: cleanup_module: caches cleared\n");
1492 kfree(mpc->mps_macs);
1493 memset(mpc, 0, sizeof(struct mpoa_client));
1494 ddprintk("mpoa: cleanup_module: about to kfree %p\n", mpc);
1495 kfree(mpc);
1496 ddprintk("mpoa: cleanup_module: next mpc is at %p\n", tmp);
1497 mpc = tmp;
1498 }
1499
1500 qos = qos_head;
1501 qos_head = NULL;
1502 while (qos != NULL) {
1503 nextqos = qos->next;
1504 dprintk("mpoa: cleanup_module: freeing qos entry %p\n", qos);
1505 kfree(qos);
1506 qos = nextqos;
1507 }
1508
1509 return;
1510 }
1511
1512 module_init(atm_mpoa_init);
1513 module_exit(atm_mpoa_cleanup);
1514
1515 MODULE_LICENSE("GPL");
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