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Revert "backport: slub: fix possible NULL pointer dereference"
[linux-2.6.22.y-op.git] / net / atm / mpc.c
blob181c1c8f891384dfed55513be19461d70c237b2b
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 struct mpoa_client *mpcs = NULL; /* FIXME */
102 static struct atm_mpoa_qos *qos_head = NULL;
103 static DEFINE_TIMER(mpc_timer, NULL, 0, 0);
104
105
106 static struct mpoa_client *find_mpc_by_itfnum(int itf)
107 {
108 struct mpoa_client *mpc;
109
110 mpc = mpcs; /* our global linked list */
111 while (mpc != NULL) {
112 if (mpc->dev_num == itf)
113 return mpc;
114 mpc = mpc->next;
115 }
116
117 return NULL; /* not found */
118 }
119
120 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
121 {
122 struct mpoa_client *mpc;
123
124 mpc = mpcs; /* our global linked list */
125 while (mpc != NULL) {
126 if (mpc->mpoad_vcc == vcc)
127 return mpc;
128 mpc = mpc->next;
129 }
130
131 return NULL; /* not found */
132 }
133
134 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
135 {
136 struct mpoa_client *mpc;
137
138 mpc = mpcs; /* our global linked list */
139 while (mpc != NULL) {
140 if (mpc->dev == dev)
141 return mpc;
142 mpc = mpc->next;
143 }
144
145 return NULL; /* not found */
146 }
147
148 /*
149 * Functions for managing QoS list
150 */
151
152 /*
153 * Overwrites the old entry or makes a new one.
154 */
155 struct atm_mpoa_qos *atm_mpoa_add_qos(__be32 dst_ip, struct atm_qos *qos)
156 {
157 struct atm_mpoa_qos *entry;
158
159 entry = atm_mpoa_search_qos(dst_ip);
160 if (entry != NULL) {
161 entry->qos = *qos;
162 return entry;
163 }
164
165 entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
166 if (entry == NULL) {
167 printk("mpoa: atm_mpoa_add_qos: out of memory\n");
168 return entry;
169 }
170
171 entry->ipaddr = dst_ip;
172 entry->qos = *qos;
173
174 entry->next = qos_head;
175 qos_head = entry;
176
177 return entry;
178 }
179
180 struct atm_mpoa_qos *atm_mpoa_search_qos(__be32 dst_ip)
181 {
182 struct atm_mpoa_qos *qos;
183
184 qos = qos_head;
185 while( qos != NULL ){
186 if(qos->ipaddr == dst_ip) {
187 break;
188 }
189 qos = qos->next;
190 }
191
192 return qos;
193 }
194
195 /*
196 * Returns 0 for failure
197 */
198 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
199 {
200
201 struct atm_mpoa_qos *curr;
202
203 if (entry == NULL) return 0;
204 if (entry == qos_head) {
205 qos_head = qos_head->next;
206 kfree(entry);
207 return 1;
208 }
209
210 curr = qos_head;
211 while (curr != NULL) {
212 if (curr->next == entry) {
213 curr->next = entry->next;
214 kfree(entry);
215 return 1;
216 }
217 curr = curr->next;
218 }
219
220 return 0;
221 }
222
223 /* this is buggered - we need locking for qos_head */
224 void atm_mpoa_disp_qos(struct seq_file *m)
225 {
226 struct atm_mpoa_qos *qos;
227
228 qos = qos_head;
229 seq_printf(m, "QoS entries for shortcuts:\n");
230 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");
231
232 while (qos != NULL) {
233 seq_printf(m, "%u.%u.%u.%u\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n",
234 NIPQUAD(qos->ipaddr),
235 qos->qos.txtp.max_pcr, qos->qos.txtp.pcr, qos->qos.txtp.min_pcr, qos->qos.txtp.max_cdv, qos->qos.txtp.max_sdu,
236 qos->qos.rxtp.max_pcr, qos->qos.rxtp.pcr, qos->qos.rxtp.min_pcr, qos->qos.rxtp.max_cdv, qos->qos.rxtp.max_sdu);
237 qos = qos->next;
238 }
239 }
240
241 static struct net_device *find_lec_by_itfnum(int itf)
242 {
243 struct net_device *dev;
244 char name[IFNAMSIZ];
245
246 sprintf(name, "lec%d", itf);
247 dev = dev_get_by_name(name);
248
249 return dev;
250 }
251
252 static struct mpoa_client *alloc_mpc(void)
253 {
254 struct mpoa_client *mpc;
255
256 mpc = kzalloc(sizeof (struct mpoa_client), GFP_KERNEL);
257 if (mpc == NULL)
258 return NULL;
259 rwlock_init(&mpc->ingress_lock);
260 rwlock_init(&mpc->egress_lock);
261 mpc->next = mpcs;
262 atm_mpoa_init_cache(mpc);
263
264 mpc->parameters.mpc_p1 = MPC_P1;
265 mpc->parameters.mpc_p2 = MPC_P2;
266 memset(mpc->parameters.mpc_p3,0,sizeof(mpc->parameters.mpc_p3));
267 mpc->parameters.mpc_p4 = MPC_P4;
268 mpc->parameters.mpc_p5 = MPC_P5;
269 mpc->parameters.mpc_p6 = MPC_P6;
270
271 mpcs = mpc;
272
273 return mpc;
274 }
275
276 /*
277 *
278 * start_mpc() puts the MPC on line. All the packets destined
279 * to the lec underneath us are now being monitored and
280 * shortcuts will be established.
281 *
282 */
283 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
284 {
285
286 dprintk("mpoa: (%s) start_mpc:\n", mpc->dev->name);
287 if (dev->hard_start_xmit == NULL) {
288 printk("mpoa: (%s) start_mpc: dev->hard_start_xmit == NULL, not starting\n",
289 dev->name);
290 return;
291 }
292 mpc->old_hard_start_xmit = dev->hard_start_xmit;
293 dev->hard_start_xmit = mpc_send_packet;
294
295 return;
296 }
297
298 static void stop_mpc(struct mpoa_client *mpc)
299 {
300
301 dprintk("mpoa: (%s) stop_mpc:", mpc->dev->name);
302
303 /* Lets not nullify lec device's dev->hard_start_xmit */
304 if (mpc->dev->hard_start_xmit != mpc_send_packet) {
305 dprintk(" mpc already stopped, not fatal\n");
306 return;
307 }
308 dprintk("\n");
309 mpc->dev->hard_start_xmit = mpc->old_hard_start_xmit;
310 mpc->old_hard_start_xmit = NULL;
311 /* close_shortcuts(mpc); ??? FIXME */
312
313 return;
314 }
315
316 static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
317
318 static const char *mpoa_device_type_string(char type)
319 {
320 switch(type) {
321 case NON_MPOA:
322 return "non-MPOA device";
323 break;
324 case MPS:
325 return "MPS";
326 break;
327 case MPC:
328 return "MPC";
329 break;
330 case MPS_AND_MPC:
331 return "both MPS and MPC";
332 break;
333 default:
334 return "unspecified (non-MPOA) device";
335 break;
336 }
337
338 return ""; /* not reached */
339 }
340
341 /*
342 * lec device calls this via its dev->priv->lane2_ops->associate_indicator()
343 * when it sees a TLV in LE_ARP packet.
344 * We fill in the pointer above when we see a LANE2 lec initializing
345 * See LANE2 spec 3.1.5
346 *
347 * Quite a big and ugly function but when you look at it
348 * all it does is to try to locate and parse MPOA Device
349 * Type TLV.
350 * We give our lec a pointer to this function and when the
351 * lec sees a TLV it uses the pointer to call this function.
352 *
353 */
354 static void lane2_assoc_ind(struct net_device *dev, uint8_t *mac_addr,
355 uint8_t *tlvs, uint32_t sizeoftlvs)
356 {
357 uint32_t type;
358 uint8_t length, mpoa_device_type, number_of_mps_macs;
359 uint8_t *end_of_tlvs;
360 struct mpoa_client *mpc;
361
362 mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
363 dprintk("mpoa: (%s) lane2_assoc_ind: received TLV(s), ", dev->name);
364 dprintk("total length of all TLVs %d\n", sizeoftlvs);
365 mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
366 if (mpc == NULL) {
367 printk("mpoa: (%s) lane2_assoc_ind: no mpc\n", dev->name);
368 return;
369 }
370 end_of_tlvs = tlvs + sizeoftlvs;
371 while (end_of_tlvs - tlvs >= 5) {
372 type = (tlvs[0] << 24) | (tlvs[1] << 16) | (tlvs[2] << 8) | tlvs[3];
373 length = tlvs[4];
374 tlvs += 5;
375 dprintk(" type 0x%x length %02x\n", type, length);
376 if (tlvs + length > end_of_tlvs) {
377 printk("TLV value extends past its buffer, aborting parse\n");
378 return;
379 }
380
381 if (type == 0) {
382 printk("mpoa: (%s) lane2_assoc_ind: TLV type was 0, returning\n", dev->name);
383 return;
384 }
385
386 if (type != TLV_MPOA_DEVICE_TYPE) {
387 tlvs += length;
388 continue; /* skip other TLVs */
389 }
390 mpoa_device_type = *tlvs++;
391 number_of_mps_macs = *tlvs++;
392 dprintk("mpoa: (%s) MPOA device type '%s', ", dev->name, mpoa_device_type_string(mpoa_device_type));
393 if (mpoa_device_type == MPS_AND_MPC &&
394 length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
395 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
396 dev->name);
397 continue;
398 }
399 if ((mpoa_device_type == MPS || mpoa_device_type == MPC)
400 && length < 22 + number_of_mps_macs*ETH_ALEN) {
401 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
402 dev->name);
403 continue;
404 }
405 if (mpoa_device_type != MPS && mpoa_device_type != MPS_AND_MPC) {
406 dprintk("ignoring non-MPS device\n");
407 if (mpoa_device_type == MPC) tlvs += 20;
408 continue; /* we are only interested in MPSs */
409 }
410 if (number_of_mps_macs == 0 && mpoa_device_type == MPS_AND_MPC) {
411 printk("\nmpoa: (%s) lane2_assoc_ind: MPS_AND_MPC has zero MACs\n", dev->name);
412 continue; /* someone should read the spec */
413 }
414 dprintk("this MPS has %d MAC addresses\n", number_of_mps_macs);
415
416 /* ok, now we can go and tell our daemon the control address of MPS */
417 send_set_mps_ctrl_addr(tlvs, mpc);
418
419 tlvs = copy_macs(mpc, mac_addr, tlvs, number_of_mps_macs, mpoa_device_type);
420 if (tlvs == NULL) return;
421 }
422 if (end_of_tlvs - tlvs != 0)
423 printk("mpoa: (%s) lane2_assoc_ind: ignoring %Zd bytes of trailing TLV carbage\n",
424 dev->name, end_of_tlvs - tlvs);
425 return;
426 }
427
428 /*
429 * Store at least advertizing router's MAC address
430 * plus the possible MAC address(es) to mpc->mps_macs.
431 * For a freshly allocated MPOA client mpc->mps_macs == 0.
432 */
433 static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
434 uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type)
435 {
436 int num_macs;
437 num_macs = (mps_macs > 1) ? mps_macs : 1;
438
439 if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
440 if (mpc->number_of_mps_macs != 0) kfree(mpc->mps_macs);
441 mpc->number_of_mps_macs = 0;
442 mpc->mps_macs = kmalloc(num_macs*ETH_ALEN, GFP_KERNEL);
443 if (mpc->mps_macs == NULL) {
444 printk("mpoa: (%s) copy_macs: out of mem\n", mpc->dev->name);
445 return NULL;
446 }
447 }
448 memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
449 tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
450 if (mps_macs > 0)
451 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
452 tlvs += mps_macs*ETH_ALEN;
453 mpc->number_of_mps_macs = num_macs;
454
455 return tlvs;
456 }
457
458 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
459 {
460 in_cache_entry *entry;
461 struct iphdr *iph;
462 char *buff;
463 __be32 ipaddr = 0;
464
465 static struct {
466 struct llc_snap_hdr hdr;
467 __be32 tag;
468 } tagged_llc_snap_hdr = {
469 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
470 0
471 };
472
473 buff = skb->data + mpc->dev->hard_header_len;
474 iph = (struct iphdr *)buff;
475 ipaddr = iph->daddr;
476
477 ddprintk("mpoa: (%s) send_via_shortcut: ipaddr 0x%x\n", mpc->dev->name, ipaddr);
478
479 entry = mpc->in_ops->get(ipaddr, mpc);
480 if (entry == NULL) {
481 entry = mpc->in_ops->add_entry(ipaddr, mpc);
482 if (entry != NULL) mpc->in_ops->put(entry);
483 return 1;
484 }
485 if (mpc->in_ops->cache_hit(entry, mpc) != OPEN){ /* threshold not exceeded or VCC not ready */
486 ddprintk("mpoa: (%s) send_via_shortcut: cache_hit: returns != OPEN\n", mpc->dev->name);
487 mpc->in_ops->put(entry);
488 return 1;
489 }
490
491 ddprintk("mpoa: (%s) send_via_shortcut: using shortcut\n", mpc->dev->name);
492 /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
493 if (iph->ttl <= 1) {
494 ddprintk("mpoa: (%s) send_via_shortcut: IP ttl = %u, using LANE\n", mpc->dev->name, iph->ttl);
495 mpc->in_ops->put(entry);
496 return 1;
497 }
498 iph->ttl--;
499 iph->check = 0;
500 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
501
502 if (entry->ctrl_info.tag != 0) {
503 ddprintk("mpoa: (%s) send_via_shortcut: adding tag 0x%x\n", mpc->dev->name, entry->ctrl_info.tag);
504 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
505 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
506 skb_push(skb, sizeof(tagged_llc_snap_hdr)); /* add LLC/SNAP header */
507 skb_copy_to_linear_data(skb, &tagged_llc_snap_hdr,
508 sizeof(tagged_llc_snap_hdr));
509 } else {
510 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
511 skb_push(skb, sizeof(struct llc_snap_hdr)); /* add LLC/SNAP header + tag */
512 skb_copy_to_linear_data(skb, &llc_snap_mpoa_data,
513 sizeof(struct llc_snap_hdr));
514 }
515
516 atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
517 ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
518 entry->shortcut->send(entry->shortcut, skb);
519 entry->packets_fwded++;
520 mpc->in_ops->put(entry);
521
522 return 0;
523 }
524
525 /*
526 * Probably needs some error checks and locking, not sure...
527 */
528 static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev)
529 {
530 int retval;
531 struct mpoa_client *mpc;
532 struct ethhdr *eth;
533 int i = 0;
534
535 mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
536 if(mpc == NULL) {
537 printk("mpoa: (%s) mpc_send_packet: no MPC found\n", dev->name);
538 goto non_ip;
539 }
540
541 eth = (struct ethhdr *)skb->data;
542 if (eth->h_proto != htons(ETH_P_IP))
543 goto non_ip; /* Multi-Protocol Over ATM :-) */
544
545 /* Weed out funny packets (e.g., AF_PACKET or raw). */
546 if (skb->len < ETH_HLEN + sizeof(struct iphdr))
547 goto non_ip;
548 skb_set_network_header(skb, ETH_HLEN);
549 if (skb->len < ETH_HLEN + ip_hdr(skb)->ihl * 4 || ip_hdr(skb)->ihl < 5)
550 goto non_ip;
551
552 while (i < mpc->number_of_mps_macs) {
553 if (!compare_ether_addr(eth->h_dest, (mpc->mps_macs + i*ETH_ALEN)))
554 if ( send_via_shortcut(skb, mpc) == 0 ) /* try shortcut */
555 return 0; /* success! */
556 i++;
557 }
558
559 non_ip:
560 retval = mpc->old_hard_start_xmit(skb,dev);
561
562 return retval;
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 = %u.%u.%u.%u\n",
595 mpc->dev->name, NIPQUAD(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 = %u.%u.%u.%u\n",
627 mpc->dev->name, NIPQUAD(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 = (struct lec_priv *)mpc->dev->priv;
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(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 = (struct lec_priv *)mpc->dev->priv;
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 if (dev->name == NULL || strncmp(dev->name, "lec", 3))
967 return NOTIFY_DONE; /* we are only interested in lec:s */
968
969 switch (event) {
970 case NETDEV_REGISTER: /* a new lec device was allocated */
971 priv = (struct lec_priv *)dev->priv;
972 if (priv->lane_version < 2)
973 break;
974 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
975 mpc = find_mpc_by_itfnum(priv->itfnum);
976 if (mpc == NULL) {
977 dprintk("mpoa: mpoa_event_listener: allocating new mpc for %s\n",
978 dev->name);
979 mpc = alloc_mpc();
980 if (mpc == NULL) {
981 printk("mpoa: mpoa_event_listener: no new mpc");
982 break;
983 }
984 }
985 mpc->dev_num = priv->itfnum;
986 mpc->dev = dev;
987 dev_hold(dev);
988 dprintk("mpoa: (%s) was initialized\n", dev->name);
989 break;
990 case NETDEV_UNREGISTER:
991 /* the lec device was deallocated */
992 mpc = find_mpc_by_lec(dev);
993 if (mpc == NULL)
994 break;
995 dprintk("mpoa: device (%s) was deallocated\n", dev->name);
996 stop_mpc(mpc);
997 dev_put(mpc->dev);
998 mpc->dev = NULL;
999 break;
1000 case NETDEV_UP:
1001 /* the dev was ifconfig'ed up */
1002 mpc = find_mpc_by_lec(dev);
1003 if (mpc == NULL)
1004 break;
1005 if (mpc->mpoad_vcc != NULL) {
1006 start_mpc(mpc, dev);
1007 }
1008 break;
1009 case NETDEV_DOWN:
1010 /* the dev was ifconfig'ed down */
1011 /* this means that the flow of packets from the
1012 * upper layer stops
1013 */
1014 mpc = find_mpc_by_lec(dev);
1015 if (mpc == NULL)
1016 break;
1017 if (mpc->mpoad_vcc != NULL) {
1018 stop_mpc(mpc);
1019 }
1020 break;
1021 case NETDEV_REBOOT:
1022 case NETDEV_CHANGE:
1023 case NETDEV_CHANGEMTU:
1024 case NETDEV_CHANGEADDR:
1025 case NETDEV_GOING_DOWN:
1026 break;
1027 default:
1028 break;
1029 }
1030
1031 return NOTIFY_DONE;
1032 }
1033
1034 /*
1035 * Functions which are called after a message is received from mpcd.
1036 * Msg is reused on purpose.
1037 */
1038
1039
1040 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1041 {
1042 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1043 in_cache_entry *entry;
1044
1045 entry = mpc->in_ops->get(dst_ip, mpc);
1046 if(entry == NULL){
1047 entry = mpc->in_ops->add_entry(dst_ip, mpc);
1048 entry->entry_state = INGRESS_RESOLVING;
1049 msg->type = SND_MPOA_RES_RQST;
1050 msg->content.in_info = entry->ctrl_info;
1051 msg_to_mpoad(msg, mpc);
1052 do_gettimeofday(&(entry->reply_wait));
1053 mpc->in_ops->put(entry);
1054 return;
1055 }
1056
1057 if(entry->entry_state == INGRESS_INVALID){
1058 entry->entry_state = INGRESS_RESOLVING;
1059 msg->type = SND_MPOA_RES_RQST;
1060 msg->content.in_info = entry->ctrl_info;
1061 msg_to_mpoad(msg, mpc);
1062 do_gettimeofday(&(entry->reply_wait));
1063 mpc->in_ops->put(entry);
1064 return;
1065 }
1066
1067 printk("mpoa: (%s) MPOA_trigger_rcvd: entry already in resolving state\n",
1068 (mpc->dev) ? mpc->dev->name : "<unknown>");
1069 mpc->in_ops->put(entry);
1070 return;
1071 }
1072
1073 /*
1074 * Things get complicated because we have to check if there's an egress
1075 * shortcut with suitable traffic parameters we could use.
1076 */
1077 static void check_qos_and_open_shortcut(struct k_message *msg, struct mpoa_client *client, in_cache_entry *entry)
1078 {
1079 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1080 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1081 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1082
1083 if(eg_entry && eg_entry->shortcut){
1084 if(eg_entry->shortcut->qos.txtp.traffic_class &
1085 msg->qos.txtp.traffic_class &
1086 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)){
1087 if(eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1088 entry->shortcut = eg_entry->shortcut;
1089 else if(eg_entry->shortcut->qos.txtp.max_pcr > 0)
1090 entry->shortcut = eg_entry->shortcut;
1091 }
1092 if(entry->shortcut){
1093 dprintk("mpoa: (%s) using egress SVC to reach %u.%u.%u.%u\n",client->dev->name, NIPQUAD(dst_ip));
1094 client->eg_ops->put(eg_entry);
1095 return;
1096 }
1097 }
1098 if (eg_entry != NULL)
1099 client->eg_ops->put(eg_entry);
1100
1101 /* No luck in the egress cache we must open an ingress SVC */
1102 msg->type = OPEN_INGRESS_SVC;
1103 if (qos && (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class))
1104 {
1105 msg->qos = qos->qos;
1106 printk("mpoa: (%s) trying to get a CBR shortcut\n",client->dev->name);
1107 }
1108 else memset(&msg->qos,0,sizeof(struct atm_qos));
1109 msg_to_mpoad(msg, client);
1110 return;
1111 }
1112
1113 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1114 {
1115 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1116 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1117
1118 dprintk("mpoa: (%s) MPOA_res_reply_rcvd: ip %u.%u.%u.%u\n", mpc->dev->name, NIPQUAD(dst_ip));
1119 ddprintk("mpoa: (%s) MPOA_res_reply_rcvd() entry = %p", mpc->dev->name, entry);
1120 if(entry == NULL){
1121 printk("\nmpoa: (%s) ARGH, received res. reply for an entry that doesn't exist.\n", mpc->dev->name);
1122 return;
1123 }
1124 ddprintk(" entry_state = %d ", entry->entry_state);
1125
1126 if (entry->entry_state == INGRESS_RESOLVED) {
1127 printk("\nmpoa: (%s) MPOA_res_reply_rcvd for RESOLVED entry!\n", mpc->dev->name);
1128 mpc->in_ops->put(entry);
1129 return;
1130 }
1131
1132 entry->ctrl_info = msg->content.in_info;
1133 do_gettimeofday(&(entry->tv));
1134 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1135 entry->refresh_time = 0;
1136 ddprintk("entry->shortcut = %p\n", entry->shortcut);
1137
1138 if(entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL){
1139 entry->entry_state = INGRESS_RESOLVED;
1140 mpc->in_ops->put(entry);
1141 return; /* Shortcut already open... */
1142 }
1143
1144 if (entry->shortcut != NULL) {
1145 printk("mpoa: (%s) MPOA_res_reply_rcvd: entry->shortcut != NULL, impossible!\n",
1146 mpc->dev->name);
1147 mpc->in_ops->put(entry);
1148 return;
1149 }
1150
1151 check_qos_and_open_shortcut(msg, mpc, entry);
1152 entry->entry_state = INGRESS_RESOLVED;
1153 mpc->in_ops->put(entry);
1154
1155 return;
1156
1157 }
1158
1159 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1160 {
1161 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1162 __be32 mask = msg->ip_mask;
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", NIPQUAD(dst_ip));
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, NIPQUAD(dst_ip));
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 __be32 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 = kmemdup(msg->MPS_ctrl, 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
1342 return;
1343 }
1344
1345 /*
1346 * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1347 */
1348 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1349 {
1350
1351 eg_cache_entry *entry;
1352 msg->type = SND_EGRESS_PURGE;
1353
1354
1355 /* FIXME: This knows too much of the cache structure */
1356 read_lock_irq(&mpc->egress_lock);
1357 entry = mpc->eg_cache;
1358 while (entry != NULL){
1359 msg->content.eg_info = entry->ctrl_info;
1360 dprintk("mpoa: cache_id %u\n", entry->ctrl_info.cache_id);
1361 msg_to_mpoad(msg, mpc);
1362 entry = entry->next;
1363 }
1364 read_unlock_irq(&mpc->egress_lock);
1365
1366 msg->type = action;
1367 msg_to_mpoad(msg, mpc);
1368 return;
1369 }
1370
1371 static void mpc_timer_refresh(void)
1372 {
1373 mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1374 mpc_timer.data = mpc_timer.expires;
1375 mpc_timer.function = mpc_cache_check;
1376 add_timer(&mpc_timer);
1377
1378 return;
1379 }
1380
1381 static void mpc_cache_check( unsigned long checking_time )
1382 {
1383 struct mpoa_client *mpc = mpcs;
1384 static unsigned long previous_resolving_check_time;
1385 static unsigned long previous_refresh_time;
1386
1387 while( mpc != NULL ){
1388 mpc->in_ops->clear_count(mpc);
1389 mpc->eg_ops->clear_expired(mpc);
1390 if(checking_time - previous_resolving_check_time > mpc->parameters.mpc_p4 * HZ ){
1391 mpc->in_ops->check_resolving(mpc);
1392 previous_resolving_check_time = checking_time;
1393 }
1394 if(checking_time - previous_refresh_time > mpc->parameters.mpc_p5 * HZ ){
1395 mpc->in_ops->refresh(mpc);
1396 previous_refresh_time = checking_time;
1397 }
1398 mpc = mpc->next;
1399 }
1400 mpc_timer_refresh();
1401
1402 return;
1403 }
1404
1405 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1406 {
1407 int err = 0;
1408 struct atm_vcc *vcc = ATM_SD(sock);
1409
1410 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1411 return -ENOIOCTLCMD;
1412
1413 if (!capable(CAP_NET_ADMIN))
1414 return -EPERM;
1415
1416 switch (cmd) {
1417 case ATMMPC_CTRL:
1418 err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1419 if (err >= 0)
1420 sock->state = SS_CONNECTED;
1421 break;
1422 case ATMMPC_DATA:
1423 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1424 break;
1425 default:
1426 break;
1427 }
1428 return err;
1429 }
1430
1431
1432 static struct atm_ioctl atm_ioctl_ops = {
1433 .owner = THIS_MODULE,
1434 .ioctl = atm_mpoa_ioctl,
1435 };
1436
1437 static __init int atm_mpoa_init(void)
1438 {
1439 register_atm_ioctl(&atm_ioctl_ops);
1440
1441 if (mpc_proc_init() != 0)
1442 printk(KERN_INFO "mpoa: failed to initialize /proc/mpoa\n");
1443
1444 printk("mpc.c: " __DATE__ " " __TIME__ " initialized\n");
1445
1446 return 0;
1447 }
1448
1449 static void __exit atm_mpoa_cleanup(void)
1450 {
1451 struct mpoa_client *mpc, *tmp;
1452 struct atm_mpoa_qos *qos, *nextqos;
1453 struct lec_priv *priv;
1454
1455 mpc_proc_clean();
1456
1457 del_timer(&mpc_timer);
1458 unregister_netdevice_notifier(&mpoa_notifier);
1459 deregister_atm_ioctl(&atm_ioctl_ops);
1460
1461 mpc = mpcs;
1462 mpcs = NULL;
1463 while (mpc != NULL) {
1464 tmp = mpc->next;
1465 if (mpc->dev != NULL) {
1466 stop_mpc(mpc);
1467 priv = (struct lec_priv *)mpc->dev->priv;
1468 if (priv->lane2_ops != NULL)
1469 priv->lane2_ops->associate_indicator = NULL;
1470 }
1471 ddprintk("mpoa: cleanup_module: about to clear caches\n");
1472 mpc->in_ops->destroy_cache(mpc);
1473 mpc->eg_ops->destroy_cache(mpc);
1474 ddprintk("mpoa: cleanup_module: caches cleared\n");
1475 kfree(mpc->mps_macs);
1476 memset(mpc, 0, sizeof(struct mpoa_client));
1477 ddprintk("mpoa: cleanup_module: about to kfree %p\n", mpc);
1478 kfree(mpc);
1479 ddprintk("mpoa: cleanup_module: next mpc is at %p\n", tmp);
1480 mpc = tmp;
1481 }
1482
1483 qos = qos_head;
1484 qos_head = NULL;
1485 while (qos != NULL) {
1486 nextqos = qos->next;
1487 dprintk("mpoa: cleanup_module: freeing qos entry %p\n", qos);
1488 kfree(qos);
1489 qos = nextqos;
1490 }
1491
1492 return;
1493 }
1494
1495 module_init(atm_mpoa_init);
1496 module_exit(atm_mpoa_cleanup);
1497
1498 MODULE_LICENSE("GPL");
linux v2.6.22.y-op