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OMAP: GPIO: Fix incorrect gpio_get logic for output GPIOs
[linux-ginger.git] / net / atm / mpc.c
blobe5bf11453a18b60b7b30ac2a4f3aea91ff60e978
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 const uint8_t *copy_macs(struct mpoa_client *mpc,
66 const uint8_t *router_mac,
67 const uint8_t *tlvs, uint8_t mps_macs,
68 uint8_t device_type);
69 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
70
71 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc);
72 static void mpoad_close(struct atm_vcc *vcc);
73 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
74
75 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
76 static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev);
77 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev);
78 static void mpc_timer_refresh(void);
79 static void mpc_cache_check( unsigned long checking_time );
80
81 static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
82 0xaa, 0xaa, 0x03,
83 {0x00, 0x00, 0x5e},
84 {0x00, 0x03} /* For MPOA control PDUs */
85 };
86 static struct llc_snap_hdr llc_snap_mpoa_data = {
87 0xaa, 0xaa, 0x03,
88 {0x00, 0x00, 0x00},
89 {0x08, 0x00} /* This is for IP PDUs only */
90 };
91 static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
92 0xaa, 0xaa, 0x03,
93 {0x00, 0x00, 0x00},
94 {0x88, 0x4c} /* This is for tagged data PDUs */
95 };
96
97 static struct notifier_block mpoa_notifier = {
98 mpoa_event_listener,
99 NULL,
100 0
101 };
102
103 struct mpoa_client *mpcs = NULL; /* FIXME */
104 static struct atm_mpoa_qos *qos_head = NULL;
105 static DEFINE_TIMER(mpc_timer, NULL, 0, 0);
106
107
108 static struct mpoa_client *find_mpc_by_itfnum(int itf)
109 {
110 struct mpoa_client *mpc;
111
112 mpc = mpcs; /* our global linked list */
113 while (mpc != NULL) {
114 if (mpc->dev_num == itf)
115 return mpc;
116 mpc = mpc->next;
117 }
118
119 return NULL; /* not found */
120 }
121
122 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
123 {
124 struct mpoa_client *mpc;
125
126 mpc = mpcs; /* our global linked list */
127 while (mpc != NULL) {
128 if (mpc->mpoad_vcc == vcc)
129 return mpc;
130 mpc = mpc->next;
131 }
132
133 return NULL; /* not found */
134 }
135
136 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
137 {
138 struct mpoa_client *mpc;
139
140 mpc = mpcs; /* our global linked list */
141 while (mpc != NULL) {
142 if (mpc->dev == dev)
143 return mpc;
144 mpc = mpc->next;
145 }
146
147 return NULL; /* not found */
148 }
149
150 /*
151 * Functions for managing QoS list
152 */
153
154 /*
155 * Overwrites the old entry or makes a new one.
156 */
157 struct atm_mpoa_qos *atm_mpoa_add_qos(__be32 dst_ip, struct atm_qos *qos)
158 {
159 struct atm_mpoa_qos *entry;
160
161 entry = atm_mpoa_search_qos(dst_ip);
162 if (entry != NULL) {
163 entry->qos = *qos;
164 return entry;
165 }
166
167 entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
168 if (entry == NULL) {
169 printk("mpoa: atm_mpoa_add_qos: out of memory\n");
170 return entry;
171 }
172
173 entry->ipaddr = dst_ip;
174 entry->qos = *qos;
175
176 entry->next = qos_head;
177 qos_head = entry;
178
179 return entry;
180 }
181
182 struct atm_mpoa_qos *atm_mpoa_search_qos(__be32 dst_ip)
183 {
184 struct atm_mpoa_qos *qos;
185
186 qos = qos_head;
187 while( qos != NULL ){
188 if(qos->ipaddr == dst_ip) {
189 break;
190 }
191 qos = qos->next;
192 }
193
194 return qos;
195 }
196
197 /*
198 * Returns 0 for failure
199 */
200 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
201 {
202
203 struct atm_mpoa_qos *curr;
204
205 if (entry == NULL) return 0;
206 if (entry == qos_head) {
207 qos_head = qos_head->next;
208 kfree(entry);
209 return 1;
210 }
211
212 curr = qos_head;
213 while (curr != NULL) {
214 if (curr->next == entry) {
215 curr->next = entry->next;
216 kfree(entry);
217 return 1;
218 }
219 curr = curr->next;
220 }
221
222 return 0;
223 }
224
225 /* this is buggered - we need locking for qos_head */
226 void atm_mpoa_disp_qos(struct seq_file *m)
227 {
228 struct atm_mpoa_qos *qos;
229
230 qos = qos_head;
231 seq_printf(m, "QoS entries for shortcuts:\n");
232 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");
233
234 while (qos != NULL) {
235 seq_printf(m, "%pI4\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n",
236 &qos->ipaddr,
237 qos->qos.txtp.max_pcr, qos->qos.txtp.pcr, qos->qos.txtp.min_pcr, qos->qos.txtp.max_cdv, qos->qos.txtp.max_sdu,
238 qos->qos.rxtp.max_pcr, qos->qos.rxtp.pcr, qos->qos.rxtp.min_pcr, qos->qos.rxtp.max_cdv, qos->qos.rxtp.max_sdu);
239 qos = qos->next;
240 }
241 }
242
243 static struct net_device *find_lec_by_itfnum(int itf)
244 {
245 struct net_device *dev;
246 char name[IFNAMSIZ];
247
248 sprintf(name, "lec%d", itf);
249 dev = dev_get_by_name(&init_net, name);
250
251 return dev;
252 }
253
254 static struct mpoa_client *alloc_mpc(void)
255 {
256 struct mpoa_client *mpc;
257
258 mpc = kzalloc(sizeof (struct mpoa_client), GFP_KERNEL);
259 if (mpc == NULL)
260 return NULL;
261 rwlock_init(&mpc->ingress_lock);
262 rwlock_init(&mpc->egress_lock);
263 mpc->next = mpcs;
264 atm_mpoa_init_cache(mpc);
265
266 mpc->parameters.mpc_p1 = MPC_P1;
267 mpc->parameters.mpc_p2 = MPC_P2;
268 memset(mpc->parameters.mpc_p3,0,sizeof(mpc->parameters.mpc_p3));
269 mpc->parameters.mpc_p4 = MPC_P4;
270 mpc->parameters.mpc_p5 = MPC_P5;
271 mpc->parameters.mpc_p6 = MPC_P6;
272
273 mpcs = mpc;
274
275 return mpc;
276 }
277
278 /*
279 *
280 * start_mpc() puts the MPC on line. All the packets destined
281 * to the lec underneath us are now being monitored and
282 * shortcuts will be established.
283 *
284 */
285 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
286 {
287
288 dprintk("mpoa: (%s) start_mpc:\n", mpc->dev->name);
289 if (!dev->netdev_ops)
290 printk("mpoa: (%s) start_mpc not starting\n", dev->name);
291 else {
292 mpc->old_ops = dev->netdev_ops;
293 mpc->new_ops = *mpc->old_ops;
294 mpc->new_ops.ndo_start_xmit = mpc_send_packet;
295 dev->netdev_ops = &mpc->new_ops;
296 }
297 }
298
299 static void stop_mpc(struct mpoa_client *mpc)
300 {
301 struct net_device *dev = mpc->dev;
302 dprintk("mpoa: (%s) stop_mpc:", mpc->dev->name);
303
304 /* Lets not nullify lec device's dev->hard_start_xmit */
305 if (dev->netdev_ops != &mpc->new_ops) {
306 dprintk(" mpc already stopped, not fatal\n");
307 return;
308 }
309 dprintk("\n");
310
311 dev->netdev_ops = mpc->old_ops;
312 mpc->old_ops = NULL;
313
314 /* close_shortcuts(mpc); ??? FIXME */
315 }
316
317 static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
318
319 static const char *mpoa_device_type_string(char type)
320 {
321 switch(type) {
322 case NON_MPOA:
323 return "non-MPOA device";
324 break;
325 case MPS:
326 return "MPS";
327 break;
328 case MPC:
329 return "MPC";
330 break;
331 case MPS_AND_MPC:
332 return "both MPS and MPC";
333 break;
334 default:
335 return "unspecified (non-MPOA) device";
336 break;
337 }
338
339 return ""; /* not reached */
340 }
341
342 /*
343 * lec device calls this via its netdev_priv(dev)->lane2_ops
344 * ->associate_indicator() when it sees a TLV in LE_ARP packet.
345 * We fill in the pointer above when we see a LANE2 lec initializing
346 * See LANE2 spec 3.1.5
347 *
348 * Quite a big and ugly function but when you look at it
349 * all it does is to try to locate and parse MPOA Device
350 * Type TLV.
351 * We give our lec a pointer to this function and when the
352 * lec sees a TLV it uses the pointer to call this function.
353 *
354 */
355 static void lane2_assoc_ind(struct net_device *dev, const u8 *mac_addr,
356 const u8 *tlvs, u32 sizeoftlvs)
357 {
358 uint32_t type;
359 uint8_t length, mpoa_device_type, number_of_mps_macs;
360 const uint8_t *end_of_tlvs;
361 struct mpoa_client *mpc;
362
363 mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
364 dprintk("mpoa: (%s) lane2_assoc_ind: received TLV(s), ", dev->name);
365 dprintk("total length of all TLVs %d\n", sizeoftlvs);
366 mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
367 if (mpc == NULL) {
368 printk("mpoa: (%s) lane2_assoc_ind: no mpc\n", dev->name);
369 return;
370 }
371 end_of_tlvs = tlvs + sizeoftlvs;
372 while (end_of_tlvs - tlvs >= 5) {
373 type = (tlvs[0] << 24) | (tlvs[1] << 16) | (tlvs[2] << 8) | tlvs[3];
374 length = tlvs[4];
375 tlvs += 5;
376 dprintk(" type 0x%x length %02x\n", type, length);
377 if (tlvs + length > end_of_tlvs) {
378 printk("TLV value extends past its buffer, aborting parse\n");
379 return;
380 }
381
382 if (type == 0) {
383 printk("mpoa: (%s) lane2_assoc_ind: TLV type was 0, returning\n", dev->name);
384 return;
385 }
386
387 if (type != TLV_MPOA_DEVICE_TYPE) {
388 tlvs += length;
389 continue; /* skip other TLVs */
390 }
391 mpoa_device_type = *tlvs++;
392 number_of_mps_macs = *tlvs++;
393 dprintk("mpoa: (%s) MPOA device type '%s', ", dev->name, mpoa_device_type_string(mpoa_device_type));
394 if (mpoa_device_type == MPS_AND_MPC &&
395 length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
396 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
397 dev->name);
398 continue;
399 }
400 if ((mpoa_device_type == MPS || mpoa_device_type == MPC)
401 && length < 22 + number_of_mps_macs*ETH_ALEN) {
402 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
403 dev->name);
404 continue;
405 }
406 if (mpoa_device_type != MPS && mpoa_device_type != MPS_AND_MPC) {
407 dprintk("ignoring non-MPS device\n");
408 if (mpoa_device_type == MPC) tlvs += 20;
409 continue; /* we are only interested in MPSs */
410 }
411 if (number_of_mps_macs == 0 && mpoa_device_type == MPS_AND_MPC) {
412 printk("\nmpoa: (%s) lane2_assoc_ind: MPS_AND_MPC has zero MACs\n", dev->name);
413 continue; /* someone should read the spec */
414 }
415 dprintk("this MPS has %d MAC addresses\n", number_of_mps_macs);
416
417 /* ok, now we can go and tell our daemon the control address of MPS */
418 send_set_mps_ctrl_addr(tlvs, mpc);
419
420 tlvs = copy_macs(mpc, mac_addr, tlvs, number_of_mps_macs, mpoa_device_type);
421 if (tlvs == NULL) return;
422 }
423 if (end_of_tlvs - tlvs != 0)
424 printk("mpoa: (%s) lane2_assoc_ind: ignoring %Zd bytes of trailing TLV carbage\n",
425 dev->name, end_of_tlvs - tlvs);
426 return;
427 }
428
429 /*
430 * Store at least advertizing router's MAC address
431 * plus the possible MAC address(es) to mpc->mps_macs.
432 * For a freshly allocated MPOA client mpc->mps_macs == 0.
433 */
434 static const uint8_t *copy_macs(struct mpoa_client *mpc,
435 const uint8_t *router_mac,
436 const uint8_t *tlvs, uint8_t mps_macs,
437 uint8_t device_type)
438 {
439 int num_macs;
440 num_macs = (mps_macs > 1) ? mps_macs : 1;
441
442 if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
443 if (mpc->number_of_mps_macs != 0) kfree(mpc->mps_macs);
444 mpc->number_of_mps_macs = 0;
445 mpc->mps_macs = kmalloc(num_macs*ETH_ALEN, GFP_KERNEL);
446 if (mpc->mps_macs == NULL) {
447 printk("mpoa: (%s) copy_macs: out of mem\n", mpc->dev->name);
448 return NULL;
449 }
450 }
451 memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
452 tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
453 if (mps_macs > 0)
454 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
455 tlvs += mps_macs*ETH_ALEN;
456 mpc->number_of_mps_macs = num_macs;
457
458 return tlvs;
459 }
460
461 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
462 {
463 in_cache_entry *entry;
464 struct iphdr *iph;
465 char *buff;
466 __be32 ipaddr = 0;
467
468 static struct {
469 struct llc_snap_hdr hdr;
470 __be32 tag;
471 } tagged_llc_snap_hdr = {
472 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
473 0
474 };
475
476 buff = skb->data + mpc->dev->hard_header_len;
477 iph = (struct iphdr *)buff;
478 ipaddr = iph->daddr;
479
480 ddprintk("mpoa: (%s) send_via_shortcut: ipaddr 0x%x\n", mpc->dev->name, ipaddr);
481
482 entry = mpc->in_ops->get(ipaddr, mpc);
483 if (entry == NULL) {
484 entry = mpc->in_ops->add_entry(ipaddr, mpc);
485 if (entry != NULL) mpc->in_ops->put(entry);
486 return 1;
487 }
488 if (mpc->in_ops->cache_hit(entry, mpc) != OPEN){ /* threshold not exceeded or VCC not ready */
489 ddprintk("mpoa: (%s) send_via_shortcut: cache_hit: returns != OPEN\n", mpc->dev->name);
490 mpc->in_ops->put(entry);
491 return 1;
492 }
493
494 ddprintk("mpoa: (%s) send_via_shortcut: using shortcut\n", mpc->dev->name);
495 /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
496 if (iph->ttl <= 1) {
497 ddprintk("mpoa: (%s) send_via_shortcut: IP ttl = %u, using LANE\n", mpc->dev->name, iph->ttl);
498 mpc->in_ops->put(entry);
499 return 1;
500 }
501 iph->ttl--;
502 iph->check = 0;
503 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
504
505 if (entry->ctrl_info.tag != 0) {
506 ddprintk("mpoa: (%s) send_via_shortcut: adding tag 0x%x\n", mpc->dev->name, entry->ctrl_info.tag);
507 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
508 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
509 skb_push(skb, sizeof(tagged_llc_snap_hdr)); /* add LLC/SNAP header */
510 skb_copy_to_linear_data(skb, &tagged_llc_snap_hdr,
511 sizeof(tagged_llc_snap_hdr));
512 } else {
513 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
514 skb_push(skb, sizeof(struct llc_snap_hdr)); /* add LLC/SNAP header + tag */
515 skb_copy_to_linear_data(skb, &llc_snap_mpoa_data,
516 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 struct mpoa_client *mpc;
534 struct ethhdr *eth;
535 int i = 0;
536
537 mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
538 if(mpc == NULL) {
539 printk("mpoa: (%s) mpc_send_packet: no MPC found\n", dev->name);
540 goto non_ip;
541 }
542
543 eth = (struct ethhdr *)skb->data;
544 if (eth->h_proto != htons(ETH_P_IP))
545 goto non_ip; /* Multi-Protocol Over ATM :-) */
546
547 /* Weed out funny packets (e.g., AF_PACKET or raw). */
548 if (skb->len < ETH_HLEN + sizeof(struct iphdr))
549 goto non_ip;
550 skb_set_network_header(skb, ETH_HLEN);
551 if (skb->len < ETH_HLEN + ip_hdr(skb)->ihl * 4 || ip_hdr(skb)->ihl < 5)
552 goto non_ip;
553
554 while (i < mpc->number_of_mps_macs) {
555 if (!compare_ether_addr(eth->h_dest, (mpc->mps_macs + i*ETH_ALEN)))
556 if ( send_via_shortcut(skb, mpc) == 0 ) /* try shortcut */
557 return 0; /* success! */
558 i++;
559 }
560
561 non_ip:
562 return mpc->old_ops->ndo_start_xmit(skb,dev);
563 }
564
565 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
566 {
567 int bytes_left;
568 struct mpoa_client *mpc;
569 struct atmmpc_ioc ioc_data;
570 in_cache_entry *in_entry;
571 __be32 ipaddr;
572
573 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
574 if (bytes_left != 0) {
575 printk("mpoa: mpc_vcc_attach: Short read (missed %d bytes) from userland\n", bytes_left);
576 return -EFAULT;
577 }
578 ipaddr = ioc_data.ipaddr;
579 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
580 return -EINVAL;
581
582 mpc = find_mpc_by_itfnum(ioc_data.dev_num);
583 if (mpc == NULL)
584 return -EINVAL;
585
586 if (ioc_data.type == MPC_SOCKET_INGRESS) {
587 in_entry = mpc->in_ops->get(ipaddr, mpc);
588 if (in_entry == NULL || in_entry->entry_state < INGRESS_RESOLVED) {
589 printk("mpoa: (%s) mpc_vcc_attach: did not find RESOLVED entry from ingress cache\n",
590 mpc->dev->name);
591 if (in_entry != NULL) mpc->in_ops->put(in_entry);
592 return -EINVAL;
593 }
594 printk("mpoa: (%s) mpc_vcc_attach: attaching ingress SVC, entry = %pI4\n",
595 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
596 in_entry->shortcut = vcc;
597 mpc->in_ops->put(in_entry);
598 } else {
599 printk("mpoa: (%s) mpc_vcc_attach: attaching egress SVC\n", mpc->dev->name);
600 }
601
602 vcc->proto_data = mpc->dev;
603 vcc->push = mpc_push;
604
605 return 0;
606 }
607
608 /*
609 *
610 */
611 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
612 {
613 struct mpoa_client *mpc;
614 in_cache_entry *in_entry;
615 eg_cache_entry *eg_entry;
616
617 mpc = find_mpc_by_lec(dev);
618 if (mpc == NULL) {
619 printk("mpoa: (%s) mpc_vcc_close: close for unknown MPC\n", dev->name);
620 return;
621 }
622
623 dprintk("mpoa: (%s) mpc_vcc_close:\n", dev->name);
624 in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
625 if (in_entry) {
626 dprintk("mpoa: (%s) mpc_vcc_close: ingress SVC closed ip = %pI4\n",
627 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
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 __be32 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 = *(__be32 *)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 skb_copy_to_linear_data(new_skb, eg->ctrl_info.DLL_header,
724 eg->ctrl_info.DH_length);
725 new_skb->protocol = eth_type_trans(new_skb, dev);
726 skb_reset_network_header(new_skb);
727
728 eg->latest_ip_addr = ip_hdr(new_skb)->saddr;
729 eg->packets_rcvd++;
730 mpc->eg_ops->put(eg);
731
732 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
733 netif_rx(new_skb);
734
735 return;
736 }
737
738 static struct atmdev_ops mpc_ops = { /* only send is required */
739 .close = mpoad_close,
740 .send = msg_from_mpoad
741 };
742
743 static struct atm_dev mpc_dev = {
744 .ops = &mpc_ops,
745 .type = "mpc",
746 .number = 42,
747 .lock = __SPIN_LOCK_UNLOCKED(mpc_dev.lock)
748 /* members not explicitly initialised will be 0 */
749 };
750
751 static int atm_mpoa_mpoad_attach (struct atm_vcc *vcc, int arg)
752 {
753 struct mpoa_client *mpc;
754 struct lec_priv *priv;
755 int err;
756
757 if (mpcs == NULL) {
758 init_timer(&mpc_timer);
759 mpc_timer_refresh();
760
761 /* This lets us now how our LECs are doing */
762 err = register_netdevice_notifier(&mpoa_notifier);
763 if (err < 0) {
764 del_timer(&mpc_timer);
765 return err;
766 }
767 }
768
769 mpc = find_mpc_by_itfnum(arg);
770 if (mpc == NULL) {
771 dprintk("mpoa: mpoad_attach: allocating new mpc for itf %d\n", arg);
772 mpc = alloc_mpc();
773 if (mpc == NULL)
774 return -ENOMEM;
775 mpc->dev_num = arg;
776 mpc->dev = find_lec_by_itfnum(arg); /* NULL if there was no lec */
777 }
778 if (mpc->mpoad_vcc) {
779 printk("mpoa: mpoad_attach: mpoad is already present for itf %d\n", arg);
780 return -EADDRINUSE;
781 }
782
783 if (mpc->dev) { /* check if the lec is LANE2 capable */
784 priv = netdev_priv(mpc->dev);
785 if (priv->lane_version < 2) {
786 dev_put(mpc->dev);
787 mpc->dev = NULL;
788 } else
789 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
790 }
791
792 mpc->mpoad_vcc = vcc;
793 vcc->dev = &mpc_dev;
794 vcc_insert_socket(sk_atm(vcc));
795 set_bit(ATM_VF_META,&vcc->flags);
796 set_bit(ATM_VF_READY,&vcc->flags);
797
798 if (mpc->dev) {
799 char empty[ATM_ESA_LEN];
800 memset(empty, 0, ATM_ESA_LEN);
801
802 start_mpc(mpc, mpc->dev);
803 /* set address if mpcd e.g. gets killed and restarted.
804 * If we do not do it now we have to wait for the next LE_ARP
805 */
806 if ( memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0 )
807 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
808 }
809
810 __module_get(THIS_MODULE);
811 return arg;
812 }
813
814 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc)
815 {
816 struct k_message mesg;
817
818 memcpy (mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
819
820 mesg.type = SET_MPS_CTRL_ADDR;
821 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
822 msg_to_mpoad(&mesg, mpc);
823
824 return;
825 }
826
827 static void mpoad_close(struct atm_vcc *vcc)
828 {
829 struct mpoa_client *mpc;
830 struct sk_buff *skb;
831
832 mpc = find_mpc_by_vcc(vcc);
833 if (mpc == NULL) {
834 printk("mpoa: mpoad_close: did not find MPC\n");
835 return;
836 }
837 if (!mpc->mpoad_vcc) {
838 printk("mpoa: mpoad_close: close for non-present mpoad\n");
839 return;
840 }
841
842 mpc->mpoad_vcc = NULL;
843 if (mpc->dev) {
844 struct lec_priv *priv = netdev_priv(mpc->dev);
845 priv->lane2_ops->associate_indicator = NULL;
846 stop_mpc(mpc);
847 dev_put(mpc->dev);
848 }
849
850 mpc->in_ops->destroy_cache(mpc);
851 mpc->eg_ops->destroy_cache(mpc);
852
853 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
854 atm_return(vcc, skb->truesize);
855 kfree_skb(skb);
856 }
857
858 printk("mpoa: (%s) going down\n",
859 (mpc->dev) ? mpc->dev->name : "<unknown>");
860 module_put(THIS_MODULE);
861
862 return;
863 }
864
865 /*
866 *
867 */
868 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
869 {
870
871 struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
872 struct k_message *mesg = (struct k_message*)skb->data;
873 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
874
875 if (mpc == NULL) {
876 printk("mpoa: msg_from_mpoad: no mpc found\n");
877 return 0;
878 }
879 dprintk("mpoa: (%s) msg_from_mpoad:", (mpc->dev) ? mpc->dev->name : "<unknown>");
880 switch(mesg->type) {
881 case MPOA_RES_REPLY_RCVD:
882 dprintk(" mpoa_res_reply_rcvd\n");
883 MPOA_res_reply_rcvd(mesg, mpc);
884 break;
885 case MPOA_TRIGGER_RCVD:
886 dprintk(" mpoa_trigger_rcvd\n");
887 MPOA_trigger_rcvd(mesg, mpc);
888 break;
889 case INGRESS_PURGE_RCVD:
890 dprintk(" nhrp_purge_rcvd\n");
891 ingress_purge_rcvd(mesg, mpc);
892 break;
893 case EGRESS_PURGE_RCVD:
894 dprintk(" egress_purge_reply_rcvd\n");
895 egress_purge_rcvd(mesg, mpc);
896 break;
897 case MPS_DEATH:
898 dprintk(" mps_death\n");
899 mps_death(mesg, mpc);
900 break;
901 case CACHE_IMPOS_RCVD:
902 dprintk(" cache_impos_rcvd\n");
903 MPOA_cache_impos_rcvd(mesg, mpc);
904 break;
905 case SET_MPC_CTRL_ADDR:
906 dprintk(" set_mpc_ctrl_addr\n");
907 set_mpc_ctrl_addr_rcvd(mesg, mpc);
908 break;
909 case SET_MPS_MAC_ADDR:
910 dprintk(" set_mps_mac_addr\n");
911 set_mps_mac_addr_rcvd(mesg, mpc);
912 break;
913 case CLEAN_UP_AND_EXIT:
914 dprintk(" clean_up_and_exit\n");
915 clean_up(mesg, mpc, DIE);
916 break;
917 case RELOAD:
918 dprintk(" reload\n");
919 clean_up(mesg, mpc, RELOAD);
920 break;
921 case SET_MPC_PARAMS:
922 dprintk(" set_mpc_params\n");
923 mpc->parameters = mesg->content.params;
924 break;
925 default:
926 dprintk(" unknown message %d\n", mesg->type);
927 break;
928 }
929 kfree_skb(skb);
930
931 return 0;
932 }
933
934 /* Remember that this function may not do things that sleep */
935 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
936 {
937 struct sk_buff *skb;
938 struct sock *sk;
939
940 if (mpc == NULL || !mpc->mpoad_vcc) {
941 printk("mpoa: msg_to_mpoad: mesg %d to a non-existent mpoad\n", mesg->type);
942 return -ENXIO;
943 }
944
945 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
946 if (skb == NULL)
947 return -ENOMEM;
948 skb_put(skb, sizeof(struct k_message));
949 skb_copy_to_linear_data(skb, mesg, sizeof(*mesg));
950 atm_force_charge(mpc->mpoad_vcc, skb->truesize);
951
952 sk = sk_atm(mpc->mpoad_vcc);
953 skb_queue_tail(&sk->sk_receive_queue, skb);
954 sk->sk_data_ready(sk, skb->len);
955
956 return 0;
957 }
958
959 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev_ptr)
960 {
961 struct net_device *dev;
962 struct mpoa_client *mpc;
963 struct lec_priv *priv;
964
965 dev = (struct net_device *)dev_ptr;
966
967 if (!net_eq(dev_net(dev), &init_net))
968 return NOTIFY_DONE;
969
970 if (dev->name == NULL || strncmp(dev->name, "lec", 3))
971 return NOTIFY_DONE; /* we are only interested in lec:s */
972
973 switch (event) {
974 case NETDEV_REGISTER: /* a new lec device was allocated */
975 priv = netdev_priv(dev);
976 if (priv->lane_version < 2)
977 break;
978 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
979 mpc = find_mpc_by_itfnum(priv->itfnum);
980 if (mpc == NULL) {
981 dprintk("mpoa: mpoa_event_listener: allocating new mpc for %s\n",
982 dev->name);
983 mpc = alloc_mpc();
984 if (mpc == NULL) {
985 printk("mpoa: mpoa_event_listener: no new mpc");
986 break;
987 }
988 }
989 mpc->dev_num = priv->itfnum;
990 mpc->dev = dev;
991 dev_hold(dev);
992 dprintk("mpoa: (%s) was initialized\n", dev->name);
993 break;
994 case NETDEV_UNREGISTER:
995 /* the lec device was deallocated */
996 mpc = find_mpc_by_lec(dev);
997 if (mpc == NULL)
998 break;
999 dprintk("mpoa: device (%s) was deallocated\n", dev->name);
1000 stop_mpc(mpc);
1001 dev_put(mpc->dev);
1002 mpc->dev = NULL;
1003 break;
1004 case NETDEV_UP:
1005 /* the dev was ifconfig'ed up */
1006 mpc = find_mpc_by_lec(dev);
1007 if (mpc == NULL)
1008 break;
1009 if (mpc->mpoad_vcc != NULL) {
1010 start_mpc(mpc, dev);
1011 }
1012 break;
1013 case NETDEV_DOWN:
1014 /* the dev was ifconfig'ed down */
1015 /* this means that the flow of packets from the
1016 * upper layer stops
1017 */
1018 mpc = find_mpc_by_lec(dev);
1019 if (mpc == NULL)
1020 break;
1021 if (mpc->mpoad_vcc != NULL) {
1022 stop_mpc(mpc);
1023 }
1024 break;
1025 case NETDEV_REBOOT:
1026 case NETDEV_CHANGE:
1027 case NETDEV_CHANGEMTU:
1028 case NETDEV_CHANGEADDR:
1029 case NETDEV_GOING_DOWN:
1030 break;
1031 default:
1032 break;
1033 }
1034
1035 return NOTIFY_DONE;
1036 }
1037
1038 /*
1039 * Functions which are called after a message is received from mpcd.
1040 * Msg is reused on purpose.
1041 */
1042
1043
1044 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1045 {
1046 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1047 in_cache_entry *entry;
1048
1049 entry = mpc->in_ops->get(dst_ip, mpc);
1050 if(entry == NULL){
1051 entry = mpc->in_ops->add_entry(dst_ip, mpc);
1052 entry->entry_state = INGRESS_RESOLVING;
1053 msg->type = SND_MPOA_RES_RQST;
1054 msg->content.in_info = entry->ctrl_info;
1055 msg_to_mpoad(msg, mpc);
1056 do_gettimeofday(&(entry->reply_wait));
1057 mpc->in_ops->put(entry);
1058 return;
1059 }
1060
1061 if(entry->entry_state == INGRESS_INVALID){
1062 entry->entry_state = INGRESS_RESOLVING;
1063 msg->type = SND_MPOA_RES_RQST;
1064 msg->content.in_info = entry->ctrl_info;
1065 msg_to_mpoad(msg, mpc);
1066 do_gettimeofday(&(entry->reply_wait));
1067 mpc->in_ops->put(entry);
1068 return;
1069 }
1070
1071 printk("mpoa: (%s) MPOA_trigger_rcvd: entry already in resolving state\n",
1072 (mpc->dev) ? mpc->dev->name : "<unknown>");
1073 mpc->in_ops->put(entry);
1074 return;
1075 }
1076
1077 /*
1078 * Things get complicated because we have to check if there's an egress
1079 * shortcut with suitable traffic parameters we could use.
1080 */
1081 static void check_qos_and_open_shortcut(struct k_message *msg, struct mpoa_client *client, in_cache_entry *entry)
1082 {
1083 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1084 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1085 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1086
1087 if(eg_entry && eg_entry->shortcut){
1088 if(eg_entry->shortcut->qos.txtp.traffic_class &
1089 msg->qos.txtp.traffic_class &
1090 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)){
1091 if(eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1092 entry->shortcut = eg_entry->shortcut;
1093 else if(eg_entry->shortcut->qos.txtp.max_pcr > 0)
1094 entry->shortcut = eg_entry->shortcut;
1095 }
1096 if(entry->shortcut){
1097 dprintk("mpoa: (%s) using egress SVC to reach %pI4\n",
1098 client->dev->name, &dst_ip);
1099 client->eg_ops->put(eg_entry);
1100 return;
1101 }
1102 }
1103 if (eg_entry != NULL)
1104 client->eg_ops->put(eg_entry);
1105
1106 /* No luck in the egress cache we must open an ingress SVC */
1107 msg->type = OPEN_INGRESS_SVC;
1108 if (qos && (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class))
1109 {
1110 msg->qos = qos->qos;
1111 printk("mpoa: (%s) trying to get a CBR shortcut\n",client->dev->name);
1112 }
1113 else memset(&msg->qos,0,sizeof(struct atm_qos));
1114 msg_to_mpoad(msg, client);
1115 return;
1116 }
1117
1118 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1119 {
1120 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1121 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1122
1123 dprintk("mpoa: (%s) MPOA_res_reply_rcvd: ip %pI4\n",
1124 mpc->dev->name, &dst_ip);
1125 ddprintk("mpoa: (%s) MPOA_res_reply_rcvd() entry = %p", mpc->dev->name, entry);
1126 if(entry == NULL){
1127 printk("\nmpoa: (%s) ARGH, received res. reply for an entry that doesn't exist.\n", mpc->dev->name);
1128 return;
1129 }
1130 ddprintk(" entry_state = %d ", entry->entry_state);
1131
1132 if (entry->entry_state == INGRESS_RESOLVED) {
1133 printk("\nmpoa: (%s) MPOA_res_reply_rcvd for RESOLVED entry!\n", mpc->dev->name);
1134 mpc->in_ops->put(entry);
1135 return;
1136 }
1137
1138 entry->ctrl_info = msg->content.in_info;
1139 do_gettimeofday(&(entry->tv));
1140 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1141 entry->refresh_time = 0;
1142 ddprintk("entry->shortcut = %p\n", entry->shortcut);
1143
1144 if(entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL){
1145 entry->entry_state = INGRESS_RESOLVED;
1146 mpc->in_ops->put(entry);
1147 return; /* Shortcut already open... */
1148 }
1149
1150 if (entry->shortcut != NULL) {
1151 printk("mpoa: (%s) MPOA_res_reply_rcvd: entry->shortcut != NULL, impossible!\n",
1152 mpc->dev->name);
1153 mpc->in_ops->put(entry);
1154 return;
1155 }
1156
1157 check_qos_and_open_shortcut(msg, mpc, entry);
1158 entry->entry_state = INGRESS_RESOLVED;
1159 mpc->in_ops->put(entry);
1160
1161 return;
1162
1163 }
1164
1165 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1166 {
1167 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1168 __be32 mask = msg->ip_mask;
1169 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1170
1171 if(entry == NULL){
1172 printk("mpoa: (%s) ingress_purge_rcvd: purge for a non-existing entry, ip = %pI4\n",
1173 mpc->dev->name, &dst_ip);
1174 return;
1175 }
1176
1177 do {
1178 dprintk("mpoa: (%s) ingress_purge_rcvd: removing an ingress entry, ip = %pI4\n",
1179 mpc->dev->name, &dst_ip);
1180 write_lock_bh(&mpc->ingress_lock);
1181 mpc->in_ops->remove_entry(entry, mpc);
1182 write_unlock_bh(&mpc->ingress_lock);
1183 mpc->in_ops->put(entry);
1184 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1185 } while (entry != NULL);
1186
1187 return;
1188 }
1189
1190 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1191 {
1192 __be32 cache_id = msg->content.eg_info.cache_id;
1193 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1194
1195 if (entry == NULL) {
1196 dprintk("mpoa: (%s) egress_purge_rcvd: purge for a non-existing entry\n", mpc->dev->name);
1197 return;
1198 }
1199
1200 write_lock_irq(&mpc->egress_lock);
1201 mpc->eg_ops->remove_entry(entry, mpc);
1202 write_unlock_irq(&mpc->egress_lock);
1203
1204 mpc->eg_ops->put(entry);
1205
1206 return;
1207 }
1208
1209 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
1210 {
1211 struct sock *sk;
1212 struct k_message *purge_msg;
1213 struct sk_buff *skb;
1214
1215 dprintk("mpoa: purge_egress_shortcut: entering\n");
1216 if (vcc == NULL) {
1217 printk("mpoa: purge_egress_shortcut: vcc == NULL\n");
1218 return;
1219 }
1220
1221 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
1222 if (skb == NULL) {
1223 printk("mpoa: purge_egress_shortcut: out of memory\n");
1224 return;
1225 }
1226
1227 skb_put(skb, sizeof(struct k_message));
1228 memset(skb->data, 0, sizeof(struct k_message));
1229 purge_msg = (struct k_message *)skb->data;
1230 purge_msg->type = DATA_PLANE_PURGE;
1231 if (entry != NULL)
1232 purge_msg->content.eg_info = entry->ctrl_info;
1233
1234 atm_force_charge(vcc, skb->truesize);
1235
1236 sk = sk_atm(vcc);
1237 skb_queue_tail(&sk->sk_receive_queue, skb);
1238 sk->sk_data_ready(sk, skb->len);
1239 dprintk("mpoa: purge_egress_shortcut: exiting:\n");
1240
1241 return;
1242 }
1243
1244 /*
1245 * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1246 * of the egress shortcuts we have.
1247 */
1248 static void mps_death( struct k_message * msg, struct mpoa_client * mpc )
1249 {
1250 eg_cache_entry *entry;
1251
1252 dprintk("mpoa: (%s) mps_death:\n", mpc->dev->name);
1253
1254 if(memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)){
1255 printk("mpoa: (%s) mps_death: wrong MPS\n", mpc->dev->name);
1256 return;
1257 }
1258
1259 /* FIXME: This knows too much of the cache structure */
1260 read_lock_irq(&mpc->egress_lock);
1261 entry = mpc->eg_cache;
1262 while (entry != NULL) {
1263 purge_egress_shortcut(entry->shortcut, entry);
1264 entry = entry->next;
1265 }
1266 read_unlock_irq(&mpc->egress_lock);
1267
1268 mpc->in_ops->destroy_cache(mpc);
1269 mpc->eg_ops->destroy_cache(mpc);
1270
1271 return;
1272 }
1273
1274 static void MPOA_cache_impos_rcvd( struct k_message * msg, struct mpoa_client * mpc)
1275 {
1276 uint16_t holding_time;
1277 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1278
1279 holding_time = msg->content.eg_info.holding_time;
1280 dprintk("mpoa: (%s) MPOA_cache_impos_rcvd: entry = %p, holding_time = %u\n",
1281 mpc->dev->name, entry, holding_time);
1282 if(entry == NULL && holding_time) {
1283 entry = mpc->eg_ops->add_entry(msg, mpc);
1284 mpc->eg_ops->put(entry);
1285 return;
1286 }
1287 if(holding_time){
1288 mpc->eg_ops->update(entry, holding_time);
1289 return;
1290 }
1291
1292 write_lock_irq(&mpc->egress_lock);
1293 mpc->eg_ops->remove_entry(entry, mpc);
1294 write_unlock_irq(&mpc->egress_lock);
1295
1296 mpc->eg_ops->put(entry);
1297
1298 return;
1299 }
1300
1301 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc)
1302 {
1303 struct lec_priv *priv;
1304 int i, retval ;
1305
1306 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1307
1308 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */
1309 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */
1310 tlv[5] = 0x02; /* MPOA client */
1311 tlv[6] = 0x00; /* number of MPS MAC addresses */
1312
1313 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1314 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1315
1316 dprintk("mpoa: (%s) setting MPC ctrl ATM address to ",
1317 (mpc->dev) ? mpc->dev->name : "<unknown>");
1318 for (i = 7; i < sizeof(tlv); i++)
1319 dprintk("%02x ", tlv[i]);
1320 dprintk("\n");
1321
1322 if (mpc->dev) {
1323 priv = netdev_priv(mpc->dev);
1324 retval = priv->lane2_ops->associate_req(mpc->dev, mpc->dev->dev_addr, tlv, sizeof(tlv));
1325 if (retval == 0)
1326 printk("mpoa: (%s) MPOA device type TLV association failed\n", mpc->dev->name);
1327 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1328 if (retval < 0)
1329 printk("mpoa: (%s) targetless LE_ARP request failed\n", mpc->dev->name);
1330 }
1331
1332 return;
1333 }
1334
1335 static void set_mps_mac_addr_rcvd(struct k_message *msg, struct mpoa_client *client)
1336 {
1337
1338 if(client->number_of_mps_macs)
1339 kfree(client->mps_macs);
1340 client->number_of_mps_macs = 0;
1341 client->mps_macs = kmemdup(msg->MPS_ctrl, ETH_ALEN, GFP_KERNEL);
1342 if (client->mps_macs == NULL) {
1343 printk("mpoa: set_mps_mac_addr_rcvd: out of memory\n");
1344 return;
1345 }
1346 client->number_of_mps_macs = 1;
1347
1348 return;
1349 }
1350
1351 /*
1352 * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1353 */
1354 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1355 {
1356
1357 eg_cache_entry *entry;
1358 msg->type = SND_EGRESS_PURGE;
1359
1360
1361 /* FIXME: This knows too much of the cache structure */
1362 read_lock_irq(&mpc->egress_lock);
1363 entry = mpc->eg_cache;
1364 while (entry != NULL){
1365 msg->content.eg_info = entry->ctrl_info;
1366 dprintk("mpoa: cache_id %u\n", entry->ctrl_info.cache_id);
1367 msg_to_mpoad(msg, mpc);
1368 entry = entry->next;
1369 }
1370 read_unlock_irq(&mpc->egress_lock);
1371
1372 msg->type = action;
1373 msg_to_mpoad(msg, mpc);
1374 return;
1375 }
1376
1377 static void mpc_timer_refresh(void)
1378 {
1379 mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1380 mpc_timer.data = mpc_timer.expires;
1381 mpc_timer.function = mpc_cache_check;
1382 add_timer(&mpc_timer);
1383
1384 return;
1385 }
1386
1387 static void mpc_cache_check( unsigned long checking_time )
1388 {
1389 struct mpoa_client *mpc = mpcs;
1390 static unsigned long previous_resolving_check_time;
1391 static unsigned long previous_refresh_time;
1392
1393 while( mpc != NULL ){
1394 mpc->in_ops->clear_count(mpc);
1395 mpc->eg_ops->clear_expired(mpc);
1396 if(checking_time - previous_resolving_check_time > mpc->parameters.mpc_p4 * HZ ){
1397 mpc->in_ops->check_resolving(mpc);
1398 previous_resolving_check_time = checking_time;
1399 }
1400 if(checking_time - previous_refresh_time > mpc->parameters.mpc_p5 * HZ ){
1401 mpc->in_ops->refresh(mpc);
1402 previous_refresh_time = checking_time;
1403 }
1404 mpc = mpc->next;
1405 }
1406 mpc_timer_refresh();
1407
1408 return;
1409 }
1410
1411 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1412 {
1413 int err = 0;
1414 struct atm_vcc *vcc = ATM_SD(sock);
1415
1416 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1417 return -ENOIOCTLCMD;
1418
1419 if (!capable(CAP_NET_ADMIN))
1420 return -EPERM;
1421
1422 switch (cmd) {
1423 case ATMMPC_CTRL:
1424 err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1425 if (err >= 0)
1426 sock->state = SS_CONNECTED;
1427 break;
1428 case ATMMPC_DATA:
1429 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1430 break;
1431 default:
1432 break;
1433 }
1434 return err;
1435 }
1436
1437
1438 static struct atm_ioctl atm_ioctl_ops = {
1439 .owner = THIS_MODULE,
1440 .ioctl = atm_mpoa_ioctl,
1441 };
1442
1443 static __init int atm_mpoa_init(void)
1444 {
1445 register_atm_ioctl(&atm_ioctl_ops);
1446
1447 if (mpc_proc_init() != 0)
1448 printk(KERN_INFO "mpoa: failed to initialize /proc/mpoa\n");
1449
1450 printk("mpc.c: " __DATE__ " " __TIME__ " initialized\n");
1451
1452 return 0;
1453 }
1454
1455 static void __exit atm_mpoa_cleanup(void)
1456 {
1457 struct mpoa_client *mpc, *tmp;
1458 struct atm_mpoa_qos *qos, *nextqos;
1459 struct lec_priv *priv;
1460
1461 mpc_proc_clean();
1462
1463 del_timer(&mpc_timer);
1464 unregister_netdevice_notifier(&mpoa_notifier);
1465 deregister_atm_ioctl(&atm_ioctl_ops);
1466
1467 mpc = mpcs;
1468 mpcs = NULL;
1469 while (mpc != NULL) {
1470 tmp = mpc->next;
1471 if (mpc->dev != NULL) {
1472 stop_mpc(mpc);
1473 priv = netdev_priv(mpc->dev);
1474 if (priv->lane2_ops != NULL)
1475 priv->lane2_ops->associate_indicator = NULL;
1476 }
1477 ddprintk("mpoa: cleanup_module: about to clear caches\n");
1478 mpc->in_ops->destroy_cache(mpc);
1479 mpc->eg_ops->destroy_cache(mpc);
1480 ddprintk("mpoa: cleanup_module: caches cleared\n");
1481 kfree(mpc->mps_macs);
1482 memset(mpc, 0, sizeof(struct mpoa_client));
1483 ddprintk("mpoa: cleanup_module: about to kfree %p\n", mpc);
1484 kfree(mpc);
1485 ddprintk("mpoa: cleanup_module: next mpc is at %p\n", tmp);
1486 mpc = tmp;
1487 }
1488
1489 qos = qos_head;
1490 qos_head = NULL;
1491 while (qos != NULL) {
1492 nextqos = qos->next;
1493 dprintk("mpoa: cleanup_module: freeing qos entry %p\n", qos);
1494 kfree(qos);
1495 qos = nextqos;
1496 }
1497
1498 return;
1499 }
1500
1501 module_init(atm_mpoa_init);
1502 module_exit(atm_mpoa_cleanup);
1503
1504 MODULE_LICENSE("GPL");
Linux for Ginger Game Console