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IB/mad: Add support for dual-sided RMPP transfers.
[linux-2.6/x86.git] / net / atm / mpc.c
blob00704661e83f684872796f25d96f4b1c6501f56e
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/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 DEFINE_TIMER(mpc_timer, 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 struct atm_mpoa_qos *qos;
232
233 qos = qos_head;
234 seq_printf(m, "QoS entries for shortcuts:\n");
235 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");
236
237 while (qos != NULL) {
238 seq_printf(m, "%u.%u.%u.%u\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n",
239 NIPQUAD(qos->ipaddr),
240 qos->qos.txtp.max_pcr, qos->qos.txtp.pcr, qos->qos.txtp.min_pcr, qos->qos.txtp.max_cdv, qos->qos.txtp.max_sdu,
241 qos->qos.rxtp.max_pcr, qos->qos.rxtp.pcr, qos->qos.rxtp.min_pcr, qos->qos.rxtp.max_cdv, qos->qos.rxtp.max_sdu);
242 qos = qos->next;
243 }
244 }
245
246 static struct net_device *find_lec_by_itfnum(int itf)
247 {
248 struct net_device *dev;
249 char name[IFNAMSIZ];
250
251 sprintf(name, "lec%d", itf);
252 dev = dev_get_by_name(name);
253
254 return dev;
255 }
256
257 static struct mpoa_client *alloc_mpc(void)
258 {
259 struct mpoa_client *mpc;
260
261 mpc = kzalloc(sizeof (struct mpoa_client), GFP_KERNEL);
262 if (mpc == NULL)
263 return NULL;
264 rwlock_init(&mpc->ingress_lock);
265 rwlock_init(&mpc->egress_lock);
266 mpc->next = mpcs;
267 atm_mpoa_init_cache(mpc);
268
269 mpc->parameters.mpc_p1 = MPC_P1;
270 mpc->parameters.mpc_p2 = MPC_P2;
271 memset(mpc->parameters.mpc_p3,0,sizeof(mpc->parameters.mpc_p3));
272 mpc->parameters.mpc_p4 = MPC_P4;
273 mpc->parameters.mpc_p5 = MPC_P5;
274 mpc->parameters.mpc_p6 = MPC_P6;
275
276 mpcs = mpc;
277
278 return mpc;
279 }
280
281 /*
282 *
283 * start_mpc() puts the MPC on line. All the packets destined
284 * to the lec underneath us are now being monitored and
285 * shortcuts will be established.
286 *
287 */
288 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
289 {
290
291 dprintk("mpoa: (%s) start_mpc:\n", mpc->dev->name);
292 if (dev->hard_start_xmit == NULL) {
293 printk("mpoa: (%s) start_mpc: dev->hard_start_xmit == NULL, not starting\n",
294 dev->name);
295 return;
296 }
297 mpc->old_hard_start_xmit = dev->hard_start_xmit;
298 dev->hard_start_xmit = mpc_send_packet;
299
300 return;
301 }
302
303 static void stop_mpc(struct mpoa_client *mpc)
304 {
305
306 dprintk("mpoa: (%s) stop_mpc:", mpc->dev->name);
307
308 /* Lets not nullify lec device's dev->hard_start_xmit */
309 if (mpc->dev->hard_start_xmit != mpc_send_packet) {
310 dprintk(" mpc already stopped, not fatal\n");
311 return;
312 }
313 dprintk("\n");
314 mpc->dev->hard_start_xmit = mpc->old_hard_start_xmit;
315 mpc->old_hard_start_xmit = NULL;
316 /* close_shortcuts(mpc); ??? FIXME */
317
318 return;
319 }
320
321 static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
322
323 static const char *mpoa_device_type_string(char type)
324 {
325 switch(type) {
326 case NON_MPOA:
327 return "non-MPOA device";
328 break;
329 case MPS:
330 return "MPS";
331 break;
332 case MPC:
333 return "MPC";
334 break;
335 case MPS_AND_MPC:
336 return "both MPS and MPC";
337 break;
338 default:
339 return "unspecified (non-MPOA) device";
340 break;
341 }
342
343 return ""; /* not reached */
344 }
345
346 /*
347 * lec device calls this via its dev->priv->lane2_ops->associate_indicator()
348 * when it sees a TLV in LE_ARP packet.
349 * We fill in the pointer above when we see a LANE2 lec initializing
350 * See LANE2 spec 3.1.5
351 *
352 * Quite a big and ugly function but when you look at it
353 * all it does is to try to locate and parse MPOA Device
354 * Type TLV.
355 * We give our lec a pointer to this function and when the
356 * lec sees a TLV it uses the pointer to call this function.
357 *
358 */
359 static void lane2_assoc_ind(struct net_device *dev, uint8_t *mac_addr,
360 uint8_t *tlvs, uint32_t sizeoftlvs)
361 {
362 uint32_t type;
363 uint8_t length, mpoa_device_type, number_of_mps_macs;
364 uint8_t *end_of_tlvs;
365 struct mpoa_client *mpc;
366
367 mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
368 dprintk("mpoa: (%s) lane2_assoc_ind: received TLV(s), ", dev->name);
369 dprintk("total length of all TLVs %d\n", sizeoftlvs);
370 mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
371 if (mpc == NULL) {
372 printk("mpoa: (%s) lane2_assoc_ind: no mpc\n", dev->name);
373 return;
374 }
375 end_of_tlvs = tlvs + sizeoftlvs;
376 while (end_of_tlvs - tlvs >= 5) {
377 type = (tlvs[0] << 24) | (tlvs[1] << 16) | (tlvs[2] << 8) | tlvs[3];
378 length = tlvs[4];
379 tlvs += 5;
380 dprintk(" type 0x%x length %02x\n", type, length);
381 if (tlvs + length > end_of_tlvs) {
382 printk("TLV value extends past its buffer, aborting parse\n");
383 return;
384 }
385
386 if (type == 0) {
387 printk("mpoa: (%s) lane2_assoc_ind: TLV type was 0, returning\n", dev->name);
388 return;
389 }
390
391 if (type != TLV_MPOA_DEVICE_TYPE) {
392 tlvs += length;
393 continue; /* skip other TLVs */
394 }
395 mpoa_device_type = *tlvs++;
396 number_of_mps_macs = *tlvs++;
397 dprintk("mpoa: (%s) MPOA device type '%s', ", dev->name, mpoa_device_type_string(mpoa_device_type));
398 if (mpoa_device_type == MPS_AND_MPC &&
399 length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
400 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
401 dev->name);
402 continue;
403 }
404 if ((mpoa_device_type == MPS || mpoa_device_type == MPC)
405 && length < 22 + 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 != MPS_AND_MPC) {
411 dprintk("ignoring non-MPS device\n");
412 if (mpoa_device_type == MPC) tlvs += 20;
413 continue; /* we are only interested in MPSs */
414 }
415 if (number_of_mps_macs == 0 && mpoa_device_type == MPS_AND_MPC) {
416 printk("\nmpoa: (%s) lane2_assoc_ind: MPS_AND_MPC has zero MACs\n", dev->name);
417 continue; /* someone should read the spec */
418 }
419 dprintk("this MPS has %d MAC addresses\n", number_of_mps_macs);
420
421 /* ok, now we can go and tell our daemon the control address of MPS */
422 send_set_mps_ctrl_addr(tlvs, mpc);
423
424 tlvs = copy_macs(mpc, mac_addr, tlvs, number_of_mps_macs, mpoa_device_type);
425 if (tlvs == NULL) return;
426 }
427 if (end_of_tlvs - tlvs != 0)
428 printk("mpoa: (%s) lane2_assoc_ind: ignoring %Zd bytes of trailing TLV carbage\n",
429 dev->name, end_of_tlvs - tlvs);
430 return;
431 }
432
433 /*
434 * Store at least advertizing router's MAC address
435 * plus the possible MAC address(es) to mpc->mps_macs.
436 * For a freshly allocated MPOA client mpc->mps_macs == 0.
437 */
438 static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
439 uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type)
440 {
441 int num_macs;
442 num_macs = (mps_macs > 1) ? mps_macs : 1;
443
444 if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
445 if (mpc->number_of_mps_macs != 0) kfree(mpc->mps_macs);
446 mpc->number_of_mps_macs = 0;
447 mpc->mps_macs = kmalloc(num_macs*ETH_ALEN, GFP_KERNEL);
448 if (mpc->mps_macs == NULL) {
449 printk("mpoa: (%s) copy_macs: out of mem\n", mpc->dev->name);
450 return NULL;
451 }
452 }
453 memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
454 tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
455 if (mps_macs > 0)
456 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
457 tlvs += mps_macs*ETH_ALEN;
458 mpc->number_of_mps_macs = num_macs;
459
460 return tlvs;
461 }
462
463 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
464 {
465 in_cache_entry *entry;
466 struct iphdr *iph;
467 char *buff;
468 uint32_t ipaddr = 0;
469
470 static struct {
471 struct llc_snap_hdr hdr;
472 uint32_t tag;
473 } tagged_llc_snap_hdr = {
474 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
475 0
476 };
477
478 buff = skb->data + mpc->dev->hard_header_len;
479 iph = (struct iphdr *)buff;
480 ipaddr = iph->daddr;
481
482 ddprintk("mpoa: (%s) send_via_shortcut: ipaddr 0x%x\n", mpc->dev->name, ipaddr);
483
484 entry = mpc->in_ops->get(ipaddr, mpc);
485 if (entry == NULL) {
486 entry = mpc->in_ops->add_entry(ipaddr, mpc);
487 if (entry != NULL) mpc->in_ops->put(entry);
488 return 1;
489 }
490 if (mpc->in_ops->cache_hit(entry, mpc) != OPEN){ /* threshold not exceeded or VCC not ready */
491 ddprintk("mpoa: (%s) send_via_shortcut: cache_hit: returns != OPEN\n", mpc->dev->name);
492 mpc->in_ops->put(entry);
493 return 1;
494 }
495
496 ddprintk("mpoa: (%s) send_via_shortcut: using shortcut\n", mpc->dev->name);
497 /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
498 if (iph->ttl <= 1) {
499 ddprintk("mpoa: (%s) send_via_shortcut: IP ttl = %u, using LANE\n", mpc->dev->name, iph->ttl);
500 mpc->in_ops->put(entry);
501 return 1;
502 }
503 iph->ttl--;
504 iph->check = 0;
505 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
506
507 if (entry->ctrl_info.tag != 0) {
508 ddprintk("mpoa: (%s) send_via_shortcut: adding tag 0x%x\n", mpc->dev->name, entry->ctrl_info.tag);
509 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
510 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
511 skb_push(skb, sizeof(tagged_llc_snap_hdr)); /* add LLC/SNAP header */
512 memcpy(skb->data, &tagged_llc_snap_hdr, sizeof(tagged_llc_snap_hdr));
513 } else {
514 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
515 skb_push(skb, sizeof(struct llc_snap_hdr)); /* add LLC/SNAP header + tag */
516 memcpy(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr));
517 }
518
519 atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
520 ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
521 entry->shortcut->send(entry->shortcut, skb);
522 entry->packets_fwded++;
523 mpc->in_ops->put(entry);
524
525 return 0;
526 }
527
528 /*
529 * Probably needs some error checks and locking, not sure...
530 */
531 static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev)
532 {
533 int retval;
534 struct mpoa_client *mpc;
535 struct ethhdr *eth;
536 int i = 0;
537
538 mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
539 if(mpc == NULL) {
540 printk("mpoa: (%s) mpc_send_packet: no MPC found\n", dev->name);
541 goto non_ip;
542 }
543
544 eth = (struct ethhdr *)skb->data;
545 if (eth->h_proto != htons(ETH_P_IP))
546 goto non_ip; /* Multi-Protocol Over ATM :-) */
547
548 while (i < mpc->number_of_mps_macs) {
549 if (!compare_ether_addr(eth->h_dest, (mpc->mps_macs + i*ETH_ALEN)))
550 if ( send_via_shortcut(skb, mpc) == 0 ) /* try shortcut */
551 return 0; /* success! */
552 i++;
553 }
554
555 non_ip:
556 retval = mpc->old_hard_start_xmit(skb,dev);
557
558 return retval;
559 }
560
561 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
562 {
563 int bytes_left;
564 struct mpoa_client *mpc;
565 struct atmmpc_ioc ioc_data;
566 in_cache_entry *in_entry;
567 uint32_t ipaddr;
568 unsigned char *ip;
569
570 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
571 if (bytes_left != 0) {
572 printk("mpoa: mpc_vcc_attach: Short read (missed %d bytes) from userland\n", bytes_left);
573 return -EFAULT;
574 }
575 ipaddr = ioc_data.ipaddr;
576 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
577 return -EINVAL;
578
579 mpc = find_mpc_by_itfnum(ioc_data.dev_num);
580 if (mpc == NULL)
581 return -EINVAL;
582
583 if (ioc_data.type == MPC_SOCKET_INGRESS) {
584 in_entry = mpc->in_ops->get(ipaddr, mpc);
585 if (in_entry == NULL || in_entry->entry_state < INGRESS_RESOLVED) {
586 printk("mpoa: (%s) mpc_vcc_attach: did not find RESOLVED entry from ingress cache\n",
587 mpc->dev->name);
588 if (in_entry != NULL) mpc->in_ops->put(in_entry);
589 return -EINVAL;
590 }
591 ip = (unsigned char*)&in_entry->ctrl_info.in_dst_ip;
592 printk("mpoa: (%s) mpc_vcc_attach: attaching ingress SVC, entry = %u.%u.%u.%u\n",
593 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
594 in_entry->shortcut = vcc;
595 mpc->in_ops->put(in_entry);
596 } else {
597 printk("mpoa: (%s) mpc_vcc_attach: attaching egress SVC\n", mpc->dev->name);
598 }
599
600 vcc->proto_data = mpc->dev;
601 vcc->push = mpc_push;
602
603 return 0;
604 }
605
606 /*
607 *
608 */
609 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
610 {
611 struct mpoa_client *mpc;
612 in_cache_entry *in_entry;
613 eg_cache_entry *eg_entry;
614
615 mpc = find_mpc_by_lec(dev);
616 if (mpc == NULL) {
617 printk("mpoa: (%s) mpc_vcc_close: close for unknown MPC\n", dev->name);
618 return;
619 }
620
621 dprintk("mpoa: (%s) mpc_vcc_close:\n", dev->name);
622 in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
623 if (in_entry) {
624 unsigned char *ip __attribute__ ((unused)) =
625 (unsigned char *)&in_entry->ctrl_info.in_dst_ip;
626 dprintk("mpoa: (%s) mpc_vcc_close: ingress SVC closed ip = %u.%u.%u.%u\n",
627 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
628 in_entry->shortcut = NULL;
629 mpc->in_ops->put(in_entry);
630 }
631 eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
632 if (eg_entry) {
633 dprintk("mpoa: (%s) mpc_vcc_close: egress SVC closed\n", mpc->dev->name);
634 eg_entry->shortcut = NULL;
635 mpc->eg_ops->put(eg_entry);
636 }
637
638 if (in_entry == NULL && eg_entry == NULL)
639 dprintk("mpoa: (%s) mpc_vcc_close: unused vcc closed\n", dev->name);
640
641 return;
642 }
643
644 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
645 {
646 struct net_device *dev = (struct net_device *)vcc->proto_data;
647 struct sk_buff *new_skb;
648 eg_cache_entry *eg;
649 struct mpoa_client *mpc;
650 uint32_t tag;
651 char *tmp;
652
653 ddprintk("mpoa: (%s) mpc_push:\n", dev->name);
654 if (skb == NULL) {
655 dprintk("mpoa: (%s) mpc_push: null skb, closing VCC\n", dev->name);
656 mpc_vcc_close(vcc, dev);
657 return;
658 }
659
660 skb->dev = dev;
661 if (memcmp(skb->data, &llc_snap_mpoa_ctrl, sizeof(struct llc_snap_hdr)) == 0) {
662 struct sock *sk = sk_atm(vcc);
663
664 dprintk("mpoa: (%s) mpc_push: control packet arrived\n", dev->name);
665 /* Pass control packets to daemon */
666 skb_queue_tail(&sk->sk_receive_queue, skb);
667 sk->sk_data_ready(sk, skb->len);
668 return;
669 }
670
671 /* data coming over the shortcut */
672 atm_return(vcc, skb->truesize);
673
674 mpc = find_mpc_by_lec(dev);
675 if (mpc == NULL) {
676 printk("mpoa: (%s) mpc_push: unknown MPC\n", dev->name);
677 return;
678 }
679
680 if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
681 ddprintk("mpoa: (%s) mpc_push: tagged data packet arrived\n", dev->name);
682
683 } else if (memcmp(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
684 printk("mpoa: (%s) mpc_push: non-tagged data packet arrived\n", dev->name);
685 printk(" mpc_push: non-tagged data unsupported, purging\n");
686 dev_kfree_skb_any(skb);
687 return;
688 } else {
689 printk("mpoa: (%s) mpc_push: garbage arrived, purging\n", dev->name);
690 dev_kfree_skb_any(skb);
691 return;
692 }
693
694 tmp = skb->data + sizeof(struct llc_snap_hdr);
695 tag = *(uint32_t *)tmp;
696
697 eg = mpc->eg_ops->get_by_tag(tag, mpc);
698 if (eg == NULL) {
699 printk("mpoa: (%s) mpc_push: Didn't find egress cache entry, tag = %u\n",
700 dev->name,tag);
701 purge_egress_shortcut(vcc, NULL);
702 dev_kfree_skb_any(skb);
703 return;
704 }
705
706 /*
707 * See if ingress MPC is using shortcut we opened as a return channel.
708 * This means we have a bi-directional vcc opened by us.
709 */
710 if (eg->shortcut == NULL) {
711 eg->shortcut = vcc;
712 printk("mpoa: (%s) mpc_push: egress SVC in use\n", dev->name);
713 }
714
715 skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); /* get rid of LLC/SNAP header */
716 new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); /* LLC/SNAP is shorter than MAC header :( */
717 dev_kfree_skb_any(skb);
718 if (new_skb == NULL){
719 mpc->eg_ops->put(eg);
720 return;
721 }
722 skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */
723 memcpy(new_skb->data, eg->ctrl_info.DLL_header, eg->ctrl_info.DH_length);
724 new_skb->protocol = eth_type_trans(new_skb, dev);
725 new_skb->nh.raw = new_skb->data;
726
727 eg->latest_ip_addr = new_skb->nh.iph->saddr;
728 eg->packets_rcvd++;
729 mpc->eg_ops->put(eg);
730
731 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
732 netif_rx(new_skb);
733
734 return;
735 }
736
737 static struct atmdev_ops mpc_ops = { /* only send is required */
738 .close = mpoad_close,
739 .send = msg_from_mpoad
740 };
741
742 static struct atm_dev mpc_dev = {
743 .ops = &mpc_ops,
744 .type = "mpc",
745 .number = 42,
746 .lock = SPIN_LOCK_UNLOCKED
747 /* members not explicitly initialised will be 0 */
748 };
749
750 static int atm_mpoa_mpoad_attach (struct atm_vcc *vcc, int arg)
751 {
752 struct mpoa_client *mpc;
753 struct lec_priv *priv;
754 int err;
755
756 if (mpcs == NULL) {
757 init_timer(&mpc_timer);
758 mpc_timer_refresh();
759
760 /* This lets us now how our LECs are doing */
761 err = register_netdevice_notifier(&mpoa_notifier);
762 if (err < 0) {
763 del_timer(&mpc_timer);
764 return err;
765 }
766 }
767
768 mpc = find_mpc_by_itfnum(arg);
769 if (mpc == NULL) {
770 dprintk("mpoa: mpoad_attach: allocating new mpc for itf %d\n", arg);
771 mpc = alloc_mpc();
772 if (mpc == NULL)
773 return -ENOMEM;
774 mpc->dev_num = arg;
775 mpc->dev = find_lec_by_itfnum(arg); /* NULL if there was no lec */
776 }
777 if (mpc->mpoad_vcc) {
778 printk("mpoa: mpoad_attach: mpoad is already present for itf %d\n", arg);
779 return -EADDRINUSE;
780 }
781
782 if (mpc->dev) { /* check if the lec is LANE2 capable */
783 priv = (struct lec_priv *)mpc->dev->priv;
784 if (priv->lane_version < 2) {
785 dev_put(mpc->dev);
786 mpc->dev = NULL;
787 } else
788 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
789 }
790
791 mpc->mpoad_vcc = vcc;
792 vcc->dev = &mpc_dev;
793 vcc_insert_socket(sk_atm(vcc));
794 set_bit(ATM_VF_META,&vcc->flags);
795 set_bit(ATM_VF_READY,&vcc->flags);
796
797 if (mpc->dev) {
798 char empty[ATM_ESA_LEN];
799 memset(empty, 0, ATM_ESA_LEN);
800
801 start_mpc(mpc, mpc->dev);
802 /* set address if mpcd e.g. gets killed and restarted.
803 * If we do not do it now we have to wait for the next LE_ARP
804 */
805 if ( memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0 )
806 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
807 }
808
809 __module_get(THIS_MODULE);
810 return arg;
811 }
812
813 static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc)
814 {
815 struct k_message mesg;
816
817 memcpy (mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
818
819 mesg.type = SET_MPS_CTRL_ADDR;
820 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
821 msg_to_mpoad(&mesg, mpc);
822
823 return;
824 }
825
826 static void mpoad_close(struct atm_vcc *vcc)
827 {
828 struct mpoa_client *mpc;
829 struct sk_buff *skb;
830
831 mpc = find_mpc_by_vcc(vcc);
832 if (mpc == NULL) {
833 printk("mpoa: mpoad_close: did not find MPC\n");
834 return;
835 }
836 if (!mpc->mpoad_vcc) {
837 printk("mpoa: mpoad_close: close for non-present mpoad\n");
838 return;
839 }
840
841 mpc->mpoad_vcc = NULL;
842 if (mpc->dev) {
843 struct lec_priv *priv = (struct lec_priv *)mpc->dev->priv;
844 priv->lane2_ops->associate_indicator = NULL;
845 stop_mpc(mpc);
846 dev_put(mpc->dev);
847 }
848
849 mpc->in_ops->destroy_cache(mpc);
850 mpc->eg_ops->destroy_cache(mpc);
851
852 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
853 atm_return(vcc, skb->truesize);
854 kfree_skb(skb);
855 }
856
857 printk("mpoa: (%s) going down\n",
858 (mpc->dev) ? mpc->dev->name : "<unknown>");
859 module_put(THIS_MODULE);
860
861 return;
862 }
863
864 /*
865 *
866 */
867 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
868 {
869
870 struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
871 struct k_message *mesg = (struct k_message*)skb->data;
872 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
873
874 if (mpc == NULL) {
875 printk("mpoa: msg_from_mpoad: no mpc found\n");
876 return 0;
877 }
878 dprintk("mpoa: (%s) msg_from_mpoad:", (mpc->dev) ? mpc->dev->name : "<unknown>");
879 switch(mesg->type) {
880 case MPOA_RES_REPLY_RCVD:
881 dprintk(" mpoa_res_reply_rcvd\n");
882 MPOA_res_reply_rcvd(mesg, mpc);
883 break;
884 case MPOA_TRIGGER_RCVD:
885 dprintk(" mpoa_trigger_rcvd\n");
886 MPOA_trigger_rcvd(mesg, mpc);
887 break;
888 case INGRESS_PURGE_RCVD:
889 dprintk(" nhrp_purge_rcvd\n");
890 ingress_purge_rcvd(mesg, mpc);
891 break;
892 case EGRESS_PURGE_RCVD:
893 dprintk(" egress_purge_reply_rcvd\n");
894 egress_purge_rcvd(mesg, mpc);
895 break;
896 case MPS_DEATH:
897 dprintk(" mps_death\n");
898 mps_death(mesg, mpc);
899 break;
900 case CACHE_IMPOS_RCVD:
901 dprintk(" cache_impos_rcvd\n");
902 MPOA_cache_impos_rcvd(mesg, mpc);
903 break;
904 case SET_MPC_CTRL_ADDR:
905 dprintk(" set_mpc_ctrl_addr\n");
906 set_mpc_ctrl_addr_rcvd(mesg, mpc);
907 break;
908 case SET_MPS_MAC_ADDR:
909 dprintk(" set_mps_mac_addr\n");
910 set_mps_mac_addr_rcvd(mesg, mpc);
911 break;
912 case CLEAN_UP_AND_EXIT:
913 dprintk(" clean_up_and_exit\n");
914 clean_up(mesg, mpc, DIE);
915 break;
916 case RELOAD:
917 dprintk(" reload\n");
918 clean_up(mesg, mpc, RELOAD);
919 break;
920 case SET_MPC_PARAMS:
921 dprintk(" set_mpc_params\n");
922 mpc->parameters = mesg->content.params;
923 break;
924 default:
925 dprintk(" unknown message %d\n", mesg->type);
926 break;
927 }
928 kfree_skb(skb);
929
930 return 0;
931 }
932
933 /* Remember that this function may not do things that sleep */
934 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
935 {
936 struct sk_buff *skb;
937 struct sock *sk;
938
939 if (mpc == NULL || !mpc->mpoad_vcc) {
940 printk("mpoa: msg_to_mpoad: mesg %d to a non-existent mpoad\n", mesg->type);
941 return -ENXIO;
942 }
943
944 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
945 if (skb == NULL)
946 return -ENOMEM;
947 skb_put(skb, sizeof(struct k_message));
948 memcpy(skb->data, mesg, sizeof(struct k_message));
949 atm_force_charge(mpc->mpoad_vcc, skb->truesize);
950
951 sk = sk_atm(mpc->mpoad_vcc);
952 skb_queue_tail(&sk->sk_receive_queue, skb);
953 sk->sk_data_ready(sk, skb->len);
954
955 return 0;
956 }
957
958 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev_ptr)
959 {
960 struct net_device *dev;
961 struct mpoa_client *mpc;
962 struct lec_priv *priv;
963
964 dev = (struct net_device *)dev_ptr;
965 if (dev->name == NULL || strncmp(dev->name, "lec", 3))
966 return NOTIFY_DONE; /* we are only interested in lec:s */
967
968 switch (event) {
969 case NETDEV_REGISTER: /* a new lec device was allocated */
970 priv = (struct lec_priv *)dev->priv;
971 if (priv->lane_version < 2)
972 break;
973 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
974 mpc = find_mpc_by_itfnum(priv->itfnum);
975 if (mpc == NULL) {
976 dprintk("mpoa: mpoa_event_listener: allocating new mpc for %s\n",
977 dev->name);
978 mpc = alloc_mpc();
979 if (mpc == NULL) {
980 printk("mpoa: mpoa_event_listener: no new mpc");
981 break;
982 }
983 }
984 mpc->dev_num = priv->itfnum;
985 mpc->dev = dev;
986 dev_hold(dev);
987 dprintk("mpoa: (%s) was initialized\n", dev->name);
988 break;
989 case NETDEV_UNREGISTER:
990 /* the lec device was deallocated */
991 mpc = find_mpc_by_lec(dev);
992 if (mpc == NULL)
993 break;
994 dprintk("mpoa: device (%s) was deallocated\n", dev->name);
995 stop_mpc(mpc);
996 dev_put(mpc->dev);
997 mpc->dev = NULL;
998 break;
999 case NETDEV_UP:
1000 /* the dev was ifconfig'ed up */
1001 mpc = find_mpc_by_lec(dev);
1002 if (mpc == NULL)
1003 break;
1004 if (mpc->mpoad_vcc != NULL) {
1005 start_mpc(mpc, dev);
1006 }
1007 break;
1008 case NETDEV_DOWN:
1009 /* the dev was ifconfig'ed down */
1010 /* this means that the flow of packets from the
1011 * upper layer stops
1012 */
1013 mpc = find_mpc_by_lec(dev);
1014 if (mpc == NULL)
1015 break;
1016 if (mpc->mpoad_vcc != NULL) {
1017 stop_mpc(mpc);
1018 }
1019 break;
1020 case NETDEV_REBOOT:
1021 case NETDEV_CHANGE:
1022 case NETDEV_CHANGEMTU:
1023 case NETDEV_CHANGEADDR:
1024 case NETDEV_GOING_DOWN:
1025 break;
1026 default:
1027 break;
1028 }
1029
1030 return NOTIFY_DONE;
1031 }
1032
1033 /*
1034 * Functions which are called after a message is received from mpcd.
1035 * Msg is reused on purpose.
1036 */
1037
1038
1039 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1040 {
1041 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1042 in_cache_entry *entry;
1043
1044 entry = mpc->in_ops->get(dst_ip, mpc);
1045 if(entry == NULL){
1046 entry = mpc->in_ops->add_entry(dst_ip, mpc);
1047 entry->entry_state = INGRESS_RESOLVING;
1048 msg->type = SND_MPOA_RES_RQST;
1049 msg->content.in_info = entry->ctrl_info;
1050 msg_to_mpoad(msg, mpc);
1051 do_gettimeofday(&(entry->reply_wait));
1052 mpc->in_ops->put(entry);
1053 return;
1054 }
1055
1056 if(entry->entry_state == INGRESS_INVALID){
1057 entry->entry_state = INGRESS_RESOLVING;
1058 msg->type = SND_MPOA_RES_RQST;
1059 msg->content.in_info = entry->ctrl_info;
1060 msg_to_mpoad(msg, mpc);
1061 do_gettimeofday(&(entry->reply_wait));
1062 mpc->in_ops->put(entry);
1063 return;
1064 }
1065
1066 printk("mpoa: (%s) MPOA_trigger_rcvd: entry already in resolving state\n",
1067 (mpc->dev) ? mpc->dev->name : "<unknown>");
1068 mpc->in_ops->put(entry);
1069 return;
1070 }
1071
1072 /*
1073 * Things get complicated because we have to check if there's an egress
1074 * shortcut with suitable traffic parameters we could use.
1075 */
1076 static void check_qos_and_open_shortcut(struct k_message *msg, struct mpoa_client *client, in_cache_entry *entry)
1077 {
1078 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1079 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1080 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1081
1082 if(eg_entry && eg_entry->shortcut){
1083 if(eg_entry->shortcut->qos.txtp.traffic_class &
1084 msg->qos.txtp.traffic_class &
1085 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)){
1086 if(eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1087 entry->shortcut = eg_entry->shortcut;
1088 else if(eg_entry->shortcut->qos.txtp.max_pcr > 0)
1089 entry->shortcut = eg_entry->shortcut;
1090 }
1091 if(entry->shortcut){
1092 dprintk("mpoa: (%s) using egress SVC to reach %u.%u.%u.%u\n",client->dev->name, NIPQUAD(dst_ip));
1093 client->eg_ops->put(eg_entry);
1094 return;
1095 }
1096 }
1097 if (eg_entry != NULL)
1098 client->eg_ops->put(eg_entry);
1099
1100 /* No luck in the egress cache we must open an ingress SVC */
1101 msg->type = OPEN_INGRESS_SVC;
1102 if (qos && (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class))
1103 {
1104 msg->qos = qos->qos;
1105 printk("mpoa: (%s) trying to get a CBR shortcut\n",client->dev->name);
1106 }
1107 else memset(&msg->qos,0,sizeof(struct atm_qos));
1108 msg_to_mpoad(msg, client);
1109 return;
1110 }
1111
1112 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1113 {
1114 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1115 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1116
1117 dprintk("mpoa: (%s) MPOA_res_reply_rcvd: ip %u.%u.%u.%u\n", mpc->dev->name, NIPQUAD(dst_ip));
1118 ddprintk("mpoa: (%s) MPOA_res_reply_rcvd() entry = %p", mpc->dev->name, entry);
1119 if(entry == NULL){
1120 printk("\nmpoa: (%s) ARGH, received res. reply for an entry that doesn't exist.\n", mpc->dev->name);
1121 return;
1122 }
1123 ddprintk(" entry_state = %d ", entry->entry_state);
1124
1125 if (entry->entry_state == INGRESS_RESOLVED) {
1126 printk("\nmpoa: (%s) MPOA_res_reply_rcvd for RESOLVED entry!\n", mpc->dev->name);
1127 mpc->in_ops->put(entry);
1128 return;
1129 }
1130
1131 entry->ctrl_info = msg->content.in_info;
1132 do_gettimeofday(&(entry->tv));
1133 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1134 entry->refresh_time = 0;
1135 ddprintk("entry->shortcut = %p\n", entry->shortcut);
1136
1137 if(entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL){
1138 entry->entry_state = INGRESS_RESOLVED;
1139 mpc->in_ops->put(entry);
1140 return; /* Shortcut already open... */
1141 }
1142
1143 if (entry->shortcut != NULL) {
1144 printk("mpoa: (%s) MPOA_res_reply_rcvd: entry->shortcut != NULL, impossible!\n",
1145 mpc->dev->name);
1146 mpc->in_ops->put(entry);
1147 return;
1148 }
1149
1150 check_qos_and_open_shortcut(msg, mpc, entry);
1151 entry->entry_state = INGRESS_RESOLVED;
1152 mpc->in_ops->put(entry);
1153
1154 return;
1155
1156 }
1157
1158 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1159 {
1160 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1161 uint32_t mask = msg->ip_mask;
1162 unsigned char *ip = (unsigned char *)&dst_ip;
1163 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1164
1165 if(entry == NULL){
1166 printk("mpoa: (%s) ingress_purge_rcvd: purge for a non-existing entry, ", mpc->dev->name);
1167 printk("ip = %u.%u.%u.%u\n", ip[0], ip[1], ip[2], ip[3]);
1168 return;
1169 }
1170
1171 do {
1172 dprintk("mpoa: (%s) ingress_purge_rcvd: removing an ingress entry, ip = %u.%u.%u.%u\n" ,
1173 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
1174 write_lock_bh(&mpc->ingress_lock);
1175 mpc->in_ops->remove_entry(entry, mpc);
1176 write_unlock_bh(&mpc->ingress_lock);
1177 mpc->in_ops->put(entry);
1178 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1179 } while (entry != NULL);
1180
1181 return;
1182 }
1183
1184 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1185 {
1186 uint32_t cache_id = msg->content.eg_info.cache_id;
1187 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1188
1189 if (entry == NULL) {
1190 dprintk("mpoa: (%s) egress_purge_rcvd: purge for a non-existing entry\n", mpc->dev->name);
1191 return;
1192 }
1193
1194 write_lock_irq(&mpc->egress_lock);
1195 mpc->eg_ops->remove_entry(entry, mpc);
1196 write_unlock_irq(&mpc->egress_lock);
1197
1198 mpc->eg_ops->put(entry);
1199
1200 return;
1201 }
1202
1203 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
1204 {
1205 struct sock *sk;
1206 struct k_message *purge_msg;
1207 struct sk_buff *skb;
1208
1209 dprintk("mpoa: purge_egress_shortcut: entering\n");
1210 if (vcc == NULL) {
1211 printk("mpoa: purge_egress_shortcut: vcc == NULL\n");
1212 return;
1213 }
1214
1215 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
1216 if (skb == NULL) {
1217 printk("mpoa: purge_egress_shortcut: out of memory\n");
1218 return;
1219 }
1220
1221 skb_put(skb, sizeof(struct k_message));
1222 memset(skb->data, 0, sizeof(struct k_message));
1223 purge_msg = (struct k_message *)skb->data;
1224 purge_msg->type = DATA_PLANE_PURGE;
1225 if (entry != NULL)
1226 purge_msg->content.eg_info = entry->ctrl_info;
1227
1228 atm_force_charge(vcc, skb->truesize);
1229
1230 sk = sk_atm(vcc);
1231 skb_queue_tail(&sk->sk_receive_queue, skb);
1232 sk->sk_data_ready(sk, skb->len);
1233 dprintk("mpoa: purge_egress_shortcut: exiting:\n");
1234
1235 return;
1236 }
1237
1238 /*
1239 * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1240 * of the egress shortcuts we have.
1241 */
1242 static void mps_death( struct k_message * msg, struct mpoa_client * mpc )
1243 {
1244 eg_cache_entry *entry;
1245
1246 dprintk("mpoa: (%s) mps_death:\n", mpc->dev->name);
1247
1248 if(memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)){
1249 printk("mpoa: (%s) mps_death: wrong MPS\n", mpc->dev->name);
1250 return;
1251 }
1252
1253 /* FIXME: This knows too much of the cache structure */
1254 read_lock_irq(&mpc->egress_lock);
1255 entry = mpc->eg_cache;
1256 while (entry != NULL) {
1257 purge_egress_shortcut(entry->shortcut, entry);
1258 entry = entry->next;
1259 }
1260 read_unlock_irq(&mpc->egress_lock);
1261
1262 mpc->in_ops->destroy_cache(mpc);
1263 mpc->eg_ops->destroy_cache(mpc);
1264
1265 return;
1266 }
1267
1268 static void MPOA_cache_impos_rcvd( struct k_message * msg, struct mpoa_client * mpc)
1269 {
1270 uint16_t holding_time;
1271 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1272
1273 holding_time = msg->content.eg_info.holding_time;
1274 dprintk("mpoa: (%s) MPOA_cache_impos_rcvd: entry = %p, holding_time = %u\n",
1275 mpc->dev->name, entry, holding_time);
1276 if(entry == NULL && holding_time) {
1277 entry = mpc->eg_ops->add_entry(msg, mpc);
1278 mpc->eg_ops->put(entry);
1279 return;
1280 }
1281 if(holding_time){
1282 mpc->eg_ops->update(entry, holding_time);
1283 return;
1284 }
1285
1286 write_lock_irq(&mpc->egress_lock);
1287 mpc->eg_ops->remove_entry(entry, mpc);
1288 write_unlock_irq(&mpc->egress_lock);
1289
1290 mpc->eg_ops->put(entry);
1291
1292 return;
1293 }
1294
1295 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc)
1296 {
1297 struct lec_priv *priv;
1298 int i, retval ;
1299
1300 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1301
1302 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */
1303 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */
1304 tlv[5] = 0x02; /* MPOA client */
1305 tlv[6] = 0x00; /* number of MPS MAC addresses */
1306
1307 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1308 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1309
1310 dprintk("mpoa: (%s) setting MPC ctrl ATM address to ",
1311 (mpc->dev) ? mpc->dev->name : "<unknown>");
1312 for (i = 7; i < sizeof(tlv); i++)
1313 dprintk("%02x ", tlv[i]);
1314 dprintk("\n");
1315
1316 if (mpc->dev) {
1317 priv = (struct lec_priv *)mpc->dev->priv;
1318 retval = priv->lane2_ops->associate_req(mpc->dev, mpc->dev->dev_addr, tlv, sizeof(tlv));
1319 if (retval == 0)
1320 printk("mpoa: (%s) MPOA device type TLV association failed\n", mpc->dev->name);
1321 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1322 if (retval < 0)
1323 printk("mpoa: (%s) targetless LE_ARP request failed\n", mpc->dev->name);
1324 }
1325
1326 return;
1327 }
1328
1329 static void set_mps_mac_addr_rcvd(struct k_message *msg, struct mpoa_client *client)
1330 {
1331
1332 if(client->number_of_mps_macs)
1333 kfree(client->mps_macs);
1334 client->number_of_mps_macs = 0;
1335 client->mps_macs = kmalloc(ETH_ALEN,GFP_KERNEL);
1336 if (client->mps_macs == NULL) {
1337 printk("mpoa: set_mps_mac_addr_rcvd: out of memory\n");
1338 return;
1339 }
1340 client->number_of_mps_macs = 1;
1341 memcpy(client->mps_macs, msg->MPS_ctrl, ETH_ALEN);
1342
1343 return;
1344 }
1345
1346 /*
1347 * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1348 */
1349 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1350 {
1351
1352 eg_cache_entry *entry;
1353 msg->type = SND_EGRESS_PURGE;
1354
1355
1356 /* FIXME: This knows too much of the cache structure */
1357 read_lock_irq(&mpc->egress_lock);
1358 entry = mpc->eg_cache;
1359 while (entry != NULL){
1360 msg->content.eg_info = entry->ctrl_info;
1361 dprintk("mpoa: cache_id %u\n", entry->ctrl_info.cache_id);
1362 msg_to_mpoad(msg, mpc);
1363 entry = entry->next;
1364 }
1365 read_unlock_irq(&mpc->egress_lock);
1366
1367 msg->type = action;
1368 msg_to_mpoad(msg, mpc);
1369 return;
1370 }
1371
1372 static void mpc_timer_refresh(void)
1373 {
1374 mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1375 mpc_timer.data = mpc_timer.expires;
1376 mpc_timer.function = mpc_cache_check;
1377 add_timer(&mpc_timer);
1378
1379 return;
1380 }
1381
1382 static void mpc_cache_check( unsigned long checking_time )
1383 {
1384 struct mpoa_client *mpc = mpcs;
1385 static unsigned long previous_resolving_check_time;
1386 static unsigned long previous_refresh_time;
1387
1388 while( mpc != NULL ){
1389 mpc->in_ops->clear_count(mpc);
1390 mpc->eg_ops->clear_expired(mpc);
1391 if(checking_time - previous_resolving_check_time > mpc->parameters.mpc_p4 * HZ ){
1392 mpc->in_ops->check_resolving(mpc);
1393 previous_resolving_check_time = checking_time;
1394 }
1395 if(checking_time - previous_refresh_time > mpc->parameters.mpc_p5 * HZ ){
1396 mpc->in_ops->refresh(mpc);
1397 previous_refresh_time = checking_time;
1398 }
1399 mpc = mpc->next;
1400 }
1401 mpc_timer_refresh();
1402
1403 return;
1404 }
1405
1406 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1407 {
1408 int err = 0;
1409 struct atm_vcc *vcc = ATM_SD(sock);
1410
1411 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1412 return -ENOIOCTLCMD;
1413
1414 if (!capable(CAP_NET_ADMIN))
1415 return -EPERM;
1416
1417 switch (cmd) {
1418 case ATMMPC_CTRL:
1419 err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1420 if (err >= 0)
1421 sock->state = SS_CONNECTED;
1422 break;
1423 case ATMMPC_DATA:
1424 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1425 break;
1426 default:
1427 break;
1428 }
1429 return err;
1430 }
1431
1432
1433 static struct atm_ioctl atm_ioctl_ops = {
1434 .owner = THIS_MODULE,
1435 .ioctl = atm_mpoa_ioctl,
1436 };
1437
1438 static __init int atm_mpoa_init(void)
1439 {
1440 register_atm_ioctl(&atm_ioctl_ops);
1441
1442 #ifdef CONFIG_PROC_FS
1443 if (mpc_proc_init() != 0)
1444 printk(KERN_INFO "mpoa: failed to initialize /proc/mpoa\n");
1445 else
1446 printk(KERN_INFO "mpoa: /proc/mpoa initialized\n");
1447 #endif
1448
1449 printk("mpc.c: " __DATE__ " " __TIME__ " initialized\n");
1450
1451 return 0;
1452 }
1453
1454 static void __exit atm_mpoa_cleanup(void)
1455 {
1456 struct mpoa_client *mpc, *tmp;
1457 struct atm_mpoa_qos *qos, *nextqos;
1458 struct lec_priv *priv;
1459
1460 #ifdef CONFIG_PROC_FS
1461 mpc_proc_clean();
1462 #endif
1463
1464 del_timer(&mpc_timer);
1465 unregister_netdevice_notifier(&mpoa_notifier);
1466 deregister_atm_ioctl(&atm_ioctl_ops);
1467
1468 mpc = mpcs;
1469 mpcs = NULL;
1470 while (mpc != NULL) {
1471 tmp = mpc->next;
1472 if (mpc->dev != NULL) {
1473 stop_mpc(mpc);
1474 priv = (struct lec_priv *)mpc->dev->priv;
1475 if (priv->lane2_ops != NULL)
1476 priv->lane2_ops->associate_indicator = NULL;
1477 }
1478 ddprintk("mpoa: cleanup_module: about to clear caches\n");
1479 mpc->in_ops->destroy_cache(mpc);
1480 mpc->eg_ops->destroy_cache(mpc);
1481 ddprintk("mpoa: cleanup_module: caches cleared\n");
1482 kfree(mpc->mps_macs);
1483 memset(mpc, 0, sizeof(struct mpoa_client));
1484 ddprintk("mpoa: cleanup_module: about to kfree %p\n", mpc);
1485 kfree(mpc);
1486 ddprintk("mpoa: cleanup_module: next mpc is at %p\n", tmp);
1487 mpc = tmp;
1488 }
1489
1490 qos = qos_head;
1491 qos_head = NULL;
1492 while (qos != NULL) {
1493 nextqos = qos->next;
1494 dprintk("mpoa: cleanup_module: freeing qos entry %p\n", qos);
1495 kfree(qos);
1496 qos = nextqos;
1497 }
1498
1499 return;
1500 }
1501
1502 module_init(atm_mpoa_init);
1503 module_exit(atm_mpoa_cleanup);
1504
1505 MODULE_LICENSE("GPL");
x86 "subsystem" repository