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Pull bugzilla-6687 into test branch
[linux.git] / net / atm / mpc.c
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1da177e4
LT		 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>
4fc268d2 6#include <linux/capability.h>
1da177e4
LT		 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 */
1da177e4
LT		 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 */
55static void MPOA_trigger_rcvd (struct k_message *msg, struct mpoa_client *mpc);
56static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
57static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
58static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
59static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
60static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action);
61static void MPOA_cache_impos_rcvd(struct k_message *msg, struct mpoa_client *mpc);
62static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
63static void set_mps_mac_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
64
65static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
66 uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type);
67static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
68
69static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc);
70static void mpoad_close(struct atm_vcc *vcc);
71static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
72
73static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
74static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev);
75static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev);
76static void mpc_timer_refresh(void);
77static void mpc_cache_check( unsigned long checking_time );
78
79static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
80 0xaa, 0xaa, 0x03,
81 {0x00, 0x00, 0x5e},
82 {0x00, 0x03} /* For MPOA control PDUs */
83};
84static 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};
89static 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
95static struct notifier_block mpoa_notifier = {
96 mpoa_event_listener,
97 NULL,
98 0
99};
100
101#ifdef CONFIG_PROC_FS
102extern int mpc_proc_init(void);
103extern void mpc_proc_clean(void);
104#endif
105
106struct mpoa_client *mpcs = NULL; /* FIXME */
107static struct atm_mpoa_qos *qos_head = NULL;
8d06afab 108static DEFINE_TIMER(mpc_timer, NULL, 0, 0);
1da177e4
LT		 109
110
111static 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
125static 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
139static 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 */
160struct 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
185struct 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 */
203int 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 */
229void atm_mpoa_disp_qos(struct seq_file *m)
230{
1da177e4
LT		 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
1da177e4 237 while (qos != NULL) {
1da177e4 238 seq_printf(m, "%u.%u.%u.%u\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n",
ff7512e1 239 NIPQUAD(qos->ipaddr),
1da177e4
LT		 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
246static 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
257static struct mpoa_client *alloc_mpc(void)
258{
259 struct mpoa_client *mpc;
260
261 mpc = kmalloc(sizeof (struct mpoa_client), GFP_KERNEL);
262 if (mpc == NULL)
263 return NULL;
264 memset(mpc, 0, sizeof(struct mpoa_client));
265 rwlock_init(&mpc->ingress_lock);
266 rwlock_init(&mpc->egress_lock);
267 mpc->next = mpcs;
268 atm_mpoa_init_cache(mpc);
269
270 mpc->parameters.mpc_p1 = MPC_P1;
271 mpc->parameters.mpc_p2 = MPC_P2;
272 memset(mpc->parameters.mpc_p3,0,sizeof(mpc->parameters.mpc_p3));
273 mpc->parameters.mpc_p4 = MPC_P4;
274 mpc->parameters.mpc_p5 = MPC_P5;
275 mpc->parameters.mpc_p6 = MPC_P6;
276
277 mpcs = mpc;
278
279 return mpc;
280}
281
282/*
283 *
284 * start_mpc() puts the MPC on line. All the packets destined
285 * to the lec underneath us are now being monitored and
286 * shortcuts will be established.
287 *
288 */
289static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
290{
291
292 dprintk("mpoa: (%s) start_mpc:\n", mpc->dev->name);
293 if (dev->hard_start_xmit == NULL) {
294 printk("mpoa: (%s) start_mpc: dev->hard_start_xmit == NULL, not starting\n",
295 dev->name);
296 return;
297 }
298 mpc->old_hard_start_xmit = dev->hard_start_xmit;
299 dev->hard_start_xmit = mpc_send_packet;
300
301 return;
302}
303
304static void stop_mpc(struct mpoa_client *mpc)
305{
306
307 dprintk("mpoa: (%s) stop_mpc:", mpc->dev->name);
308
309 /* Lets not nullify lec device's dev->hard_start_xmit */
310 if (mpc->dev->hard_start_xmit != mpc_send_packet) {
311 dprintk(" mpc already stopped, not fatal\n");
312 return;
313 }
314 dprintk("\n");
315 mpc->dev->hard_start_xmit = mpc->old_hard_start_xmit;
316 mpc->old_hard_start_xmit = NULL;
317 /* close_shortcuts(mpc); ??? FIXME */
318
319 return;
320}
321
322static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
323
324static const char *mpoa_device_type_string(char type)
325{
326 switch(type) {
327 case NON_MPOA:
328 return "non-MPOA device";
329 break;
330 case MPS:
331 return "MPS";
332 break;
333 case MPC:
334 return "MPC";
335 break;
336 case MPS_AND_MPC:
337 return "both MPS and MPC";
338 break;
339 default:
340 return "unspecified (non-MPOA) device";
341 break;
342 }
343
344 return ""; /* not reached */
345}
346
347/*
348 * lec device calls this via its dev->priv->lane2_ops->associate_indicator()
349 * when it sees a TLV in LE_ARP packet.
350 * We fill in the pointer above when we see a LANE2 lec initializing
351 * See LANE2 spec 3.1.5
352 *
353 * Quite a big and ugly function but when you look at it
354 * all it does is to try to locate and parse MPOA Device
355 * Type TLV.
356 * We give our lec a pointer to this function and when the
357 * lec sees a TLV it uses the pointer to call this function.
358 *
359 */
360static void lane2_assoc_ind(struct net_device *dev, uint8_t *mac_addr,
361 uint8_t *tlvs, uint32_t sizeoftlvs)
362{
363 uint32_t type;
364 uint8_t length, mpoa_device_type, number_of_mps_macs;
365 uint8_t *end_of_tlvs;
366 struct mpoa_client *mpc;
367
368 mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
369 dprintk("mpoa: (%s) lane2_assoc_ind: received TLV(s), ", dev->name);
370 dprintk("total length of all TLVs %d\n", sizeoftlvs);
371 mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
372 if (mpc == NULL) {
373 printk("mpoa: (%s) lane2_assoc_ind: no mpc\n", dev->name);
374 return;
375 }
376 end_of_tlvs = tlvs + sizeoftlvs;
377 while (end_of_tlvs - tlvs >= 5) {
378 type = (tlvs[0] << 24) | (tlvs[1] << 16) | (tlvs[2] << 8) | tlvs[3];
379 length = tlvs[4];
380 tlvs += 5;
381 dprintk(" type 0x%x length %02x\n", type, length);
382 if (tlvs + length > end_of_tlvs) {
383 printk("TLV value extends past its buffer, aborting parse\n");
384 return;
385 }
386
387 if (type == 0) {
388 printk("mpoa: (%s) lane2_assoc_ind: TLV type was 0, returning\n", dev->name);
389 return;
390 }
391
392 if (type != TLV_MPOA_DEVICE_TYPE) {
393 tlvs += length;
394 continue; /* skip other TLVs */
395 }
396 mpoa_device_type = *tlvs++;
397 number_of_mps_macs = *tlvs++;
398 dprintk("mpoa: (%s) MPOA device type '%s', ", dev->name, mpoa_device_type_string(mpoa_device_type));
399 if (mpoa_device_type == MPS_AND_MPC &&
400 length < (42 + 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 == MPC)
406 && length < 22 + number_of_mps_macs*ETH_ALEN) {
407 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
408 dev->name);
409 continue;
410 }
411 if (mpoa_device_type != MPS && mpoa_device_type != MPS_AND_MPC) {
412 dprintk("ignoring non-MPS device\n");
413 if (mpoa_device_type == MPC) tlvs += 20;
414 continue; /* we are only interested in MPSs */
415 }
416 if (number_of_mps_macs == 0 && mpoa_device_type == MPS_AND_MPC) {
417 printk("\nmpoa: (%s) lane2_assoc_ind: MPS_AND_MPC has zero MACs\n", dev->name);
418 continue; /* someone should read the spec */
419 }
420 dprintk("this MPS has %d MAC addresses\n", number_of_mps_macs);
421
422 /* ok, now we can go and tell our daemon the control address of MPS */
423 send_set_mps_ctrl_addr(tlvs, mpc);
424
425 tlvs = copy_macs(mpc, mac_addr, tlvs, number_of_mps_macs, mpoa_device_type);
426 if (tlvs == NULL) return;
427 }
428 if (end_of_tlvs - tlvs != 0)
429 printk("mpoa: (%s) lane2_assoc_ind: ignoring %Zd bytes of trailing TLV carbage\n",
430 dev->name, end_of_tlvs - tlvs);
431 return;
432}
433
434/*
435 * Store at least advertizing router's MAC address
436 * plus the possible MAC address(es) to mpc->mps_macs.
437 * For a freshly allocated MPOA client mpc->mps_macs == 0.
438 */
439static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
440 uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type)
441{
442 int num_macs;
443 num_macs = (mps_macs > 1) ? mps_macs : 1;
444
445 if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
446 if (mpc->number_of_mps_macs != 0) kfree(mpc->mps_macs);
447 mpc->number_of_mps_macs = 0;
448 mpc->mps_macs = kmalloc(num_macs*ETH_ALEN, GFP_KERNEL);
449 if (mpc->mps_macs == NULL) {
450 printk("mpoa: (%s) copy_macs: out of mem\n", mpc->dev->name);
451 return NULL;
452 }
453 }
454 memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
455 tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
456 if (mps_macs > 0)
457 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
458 tlvs += mps_macs*ETH_ALEN;
459 mpc->number_of_mps_macs = num_macs;
460
461 return tlvs;
462}
463
464static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
465{
466 in_cache_entry *entry;
467 struct iphdr *iph;
468 char *buff;
469 uint32_t ipaddr = 0;
470
471 static struct {
472 struct llc_snap_hdr hdr;
473 uint32_t tag;
474 } tagged_llc_snap_hdr = {
475 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
476 0
477 };
478
479 buff = skb->data + mpc->dev->hard_header_len;
480 iph = (struct iphdr *)buff;
481 ipaddr = iph->daddr;
482
483 ddprintk("mpoa: (%s) send_via_shortcut: ipaddr 0x%x\n", mpc->dev->name, ipaddr);
484
485 entry = mpc->in_ops->get(ipaddr, mpc);
486 if (entry == NULL) {
487 entry = mpc->in_ops->add_entry(ipaddr, mpc);
488 if (entry != NULL) mpc->in_ops->put(entry);
489 return 1;
490 }
491 if (mpc->in_ops->cache_hit(entry, mpc) != OPEN){ /* threshold not exceeded or VCC not ready */
492 ddprintk("mpoa: (%s) send_via_shortcut: cache_hit: returns != OPEN\n", mpc->dev->name);
493 mpc->in_ops->put(entry);
494 return 1;
495 }
496
497 ddprintk("mpoa: (%s) send_via_shortcut: using shortcut\n", mpc->dev->name);
498 /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
499 if (iph->ttl <= 1) {
500 ddprintk("mpoa: (%s) send_via_shortcut: IP ttl = %u, using LANE\n", mpc->dev->name, iph->ttl);
501 mpc->in_ops->put(entry);
502 return 1;
503 }
504 iph->ttl--;
505 iph->check = 0;
506 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
507
508 if (entry->ctrl_info.tag != 0) {
509 ddprintk("mpoa: (%s) send_via_shortcut: adding tag 0x%x\n", mpc->dev->name, entry->ctrl_info.tag);
510 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
511 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
512 skb_push(skb, sizeof(tagged_llc_snap_hdr)); /* add LLC/SNAP header */
513 memcpy(skb->data, &tagged_llc_snap_hdr, sizeof(tagged_llc_snap_hdr));
514 } else {
515 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
516 skb_push(skb, sizeof(struct llc_snap_hdr)); /* add LLC/SNAP header + tag */
517 memcpy(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr));
518 }
519
520 atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
521 ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
522 entry->shortcut->send(entry->shortcut, skb);
523 entry->packets_fwded++;
524 mpc->in_ops->put(entry);
525
526 return 0;
527}
528
529/*
530 * Probably needs some error checks and locking, not sure...
531 */
532static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev)
533{
534 int retval;
535 struct mpoa_client *mpc;
536 struct ethhdr *eth;
537 int i = 0;
538
539 mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
540 if(mpc == NULL) {
541 printk("mpoa: (%s) mpc_send_packet: no MPC found\n", dev->name);
542 goto non_ip;
543 }
544
545 eth = (struct ethhdr *)skb->data;
546 if (eth->h_proto != htons(ETH_P_IP))
547 goto non_ip; /* Multi-Protocol Over ATM :-) */
548
549 while (i < mpc->number_of_mps_macs) {
d3f4a687 550 if (!compare_ether_addr(eth->h_dest, (mpc->mps_macs + i*ETH_ALEN)))
1da177e4
LT		 551 if ( send_via_shortcut(skb, mpc) == 0 ) /* try shortcut */
552 return 0; /* success! */
553 i++;
554 }
555
556 non_ip:
557 retval = mpc->old_hard_start_xmit(skb,dev);
558
559 return retval;
560}
561
562static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
563{
564 int bytes_left;
565 struct mpoa_client *mpc;
566 struct atmmpc_ioc ioc_data;
567 in_cache_entry *in_entry;
568 uint32_t ipaddr;
569 unsigned char *ip;
570
571 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
572 if (bytes_left != 0) {
573 printk("mpoa: mpc_vcc_attach: Short read (missed %d bytes) from userland\n", bytes_left);
574 return -EFAULT;
575 }
576 ipaddr = ioc_data.ipaddr;
577 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
578 return -EINVAL;
579
580 mpc = find_mpc_by_itfnum(ioc_data.dev_num);
581 if (mpc == NULL)
582 return -EINVAL;
583
584 if (ioc_data.type == MPC_SOCKET_INGRESS) {
585 in_entry = mpc->in_ops->get(ipaddr, mpc);
586 if (in_entry == NULL || in_entry->entry_state < INGRESS_RESOLVED) {
587 printk("mpoa: (%s) mpc_vcc_attach: did not find RESOLVED entry from ingress cache\n",
588 mpc->dev->name);
589 if (in_entry != NULL) mpc->in_ops->put(in_entry);
590 return -EINVAL;
591 }
592 ip = (unsigned char*)&in_entry->ctrl_info.in_dst_ip;
593 printk("mpoa: (%s) mpc_vcc_attach: attaching ingress SVC, entry = %u.%u.%u.%u\n",
594 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
595 in_entry->shortcut = vcc;
596 mpc->in_ops->put(in_entry);
597 } else {
598 printk("mpoa: (%s) mpc_vcc_attach: attaching egress SVC\n", mpc->dev->name);
599 }
600
601 vcc->proto_data = mpc->dev;
602 vcc->push = mpc_push;
603
604 return 0;
605}
606
607/*
608 *
609 */
610static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
611{
612 struct mpoa_client *mpc;
613 in_cache_entry *in_entry;
614 eg_cache_entry *eg_entry;
615
616 mpc = find_mpc_by_lec(dev);
617 if (mpc == NULL) {
618 printk("mpoa: (%s) mpc_vcc_close: close for unknown MPC\n", dev->name);
619 return;
620 }
621
622 dprintk("mpoa: (%s) mpc_vcc_close:\n", dev->name);
623 in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
624 if (in_entry) {
625 unsigned char *ip __attribute__ ((unused)) =
626 (unsigned char *)&in_entry->ctrl_info.in_dst_ip;
627 dprintk("mpoa: (%s) mpc_vcc_close: ingress SVC closed ip = %u.%u.%u.%u\n",
628 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
629 in_entry->shortcut = NULL;
630 mpc->in_ops->put(in_entry);
631 }
632 eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
633 if (eg_entry) {
634 dprintk("mpoa: (%s) mpc_vcc_close: egress SVC closed\n", mpc->dev->name);
635 eg_entry->shortcut = NULL;
636 mpc->eg_ops->put(eg_entry);
637 }
638
639 if (in_entry == NULL && eg_entry == NULL)
640 dprintk("mpoa: (%s) mpc_vcc_close: unused vcc closed\n", dev->name);
641
642 return;
643}
644
645static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
646{
647 struct net_device *dev = (struct net_device *)vcc->proto_data;
648 struct sk_buff *new_skb;
649 eg_cache_entry *eg;
650 struct mpoa_client *mpc;
651 uint32_t tag;
652 char *tmp;
653
654 ddprintk("mpoa: (%s) mpc_push:\n", dev->name);
655 if (skb == NULL) {
656 dprintk("mpoa: (%s) mpc_push: null skb, closing VCC\n", dev->name);
657 mpc_vcc_close(vcc, dev);
658 return;
659 }
660
661 skb->dev = dev;
662 if (memcmp(skb->data, &llc_snap_mpoa_ctrl, sizeof(struct llc_snap_hdr)) == 0) {
663 struct sock *sk = sk_atm(vcc);
664
665 dprintk("mpoa: (%s) mpc_push: control packet arrived\n", dev->name);
666 /* Pass control packets to daemon */
667 skb_queue_tail(&sk->sk_receive_queue, skb);
668 sk->sk_data_ready(sk, skb->len);
669 return;
670 }
671
672 /* data coming over the shortcut */
673 atm_return(vcc, skb->truesize);
674
675 mpc = find_mpc_by_lec(dev);
676 if (mpc == NULL) {
677 printk("mpoa: (%s) mpc_push: unknown MPC\n", dev->name);
678 return;
679 }
680
681 if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
682 ddprintk("mpoa: (%s) mpc_push: tagged data packet arrived\n", dev->name);
683
684 } else if (memcmp(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
685 printk("mpoa: (%s) mpc_push: non-tagged data packet arrived\n", dev->name);
686 printk(" mpc_push: non-tagged data unsupported, purging\n");
687 dev_kfree_skb_any(skb);
688 return;
689 } else {
690 printk("mpoa: (%s) mpc_push: garbage arrived, purging\n", dev->name);
691 dev_kfree_skb_any(skb);
692 return;
693 }
694
695 tmp = skb->data + sizeof(struct llc_snap_hdr);
696 tag = *(uint32_t *)tmp;
697
698 eg = mpc->eg_ops->get_by_tag(tag, mpc);
699 if (eg == NULL) {
700 printk("mpoa: (%s) mpc_push: Didn't find egress cache entry, tag = %u\n",
701 dev->name,tag);
702 purge_egress_shortcut(vcc, NULL);
703 dev_kfree_skb_any(skb);
704 return;
705 }
706
707 /*
708 * See if ingress MPC is using shortcut we opened as a return channel.
709 * This means we have a bi-directional vcc opened by us.
710 */
711 if (eg->shortcut == NULL) {
712 eg->shortcut = vcc;
713 printk("mpoa: (%s) mpc_push: egress SVC in use\n", dev->name);
714 }
715
716 skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); /* get rid of LLC/SNAP header */
717 new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); /* LLC/SNAP is shorter than MAC header :( */
718 dev_kfree_skb_any(skb);
719 if (new_skb == NULL){
720 mpc->eg_ops->put(eg);
721 return;
722 }
723 skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */
724 memcpy(new_skb->data, eg->ctrl_info.DLL_header, eg->ctrl_info.DH_length);
725 new_skb->protocol = eth_type_trans(new_skb, dev);
726 new_skb->nh.raw = new_skb->data;
727
728 eg->latest_ip_addr = new_skb->nh.iph->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
738static struct atmdev_ops mpc_ops = { /* only send is required */
739 .close = mpoad_close,
740 .send = msg_from_mpoad
741};
742
743static struct atm_dev mpc_dev = {
744 .ops = &mpc_ops,
745 .type = "mpc",
746 .number = 42,
747 .lock = SPIN_LOCK_UNLOCKED
748 /* members not explicitly initialised will be 0 */
749};
750
751static 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
814static 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
827static 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 */
868static 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 */
935int 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 memcpy(skb->data, mesg, sizeof(struct k_message));
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
959static 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
1040static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1041{
1042 uint32_t 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 */
1077static void check_qos_and_open_shortcut(struct k_message *msg, struct mpoa_client *client, in_cache_entry *entry)
1078{
1079 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1da177e4
LT		 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){
ff7512e1 1093 dprintk("mpoa: (%s) using egress SVC to reach %u.%u.%u.%u\n",client->dev->name, NIPQUAD(dst_ip));
1da177e4
LT		 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
1113static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1114{
1da177e4
LT		 1115 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1116 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1e4fd51e 1117
ff7512e1 1118 dprintk("mpoa: (%s) MPOA_res_reply_rcvd: ip %u.%u.%u.%u\n", mpc->dev->name, NIPQUAD(dst_ip));
1da177e4
LT		 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
1159static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1160{
1161 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1162 uint32_t mask = msg->ip_mask;
1163 unsigned char *ip = (unsigned char *)&dst_ip;
1164 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1165
1166 if(entry == NULL){
1167 printk("mpoa: (%s) ingress_purge_rcvd: purge for a non-existing entry, ", mpc->dev->name);
1168 printk("ip = %u.%u.%u.%u\n", ip[0], ip[1], ip[2], ip[3]);
1169 return;
1170 }
1171
1172 do {
1173 dprintk("mpoa: (%s) ingress_purge_rcvd: removing an ingress entry, ip = %u.%u.%u.%u\n" ,
1174 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
1175 write_lock_bh(&mpc->ingress_lock);
1176 mpc->in_ops->remove_entry(entry, mpc);
1177 write_unlock_bh(&mpc->ingress_lock);
1178 mpc->in_ops->put(entry);
1179 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1180 } while (entry != NULL);
1181
1182 return;
1183}
1184
1185static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1186{
1187 uint32_t cache_id = msg->content.eg_info.cache_id;
1188 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1189
1190 if (entry == NULL) {
1191 dprintk("mpoa: (%s) egress_purge_rcvd: purge for a non-existing entry\n", mpc->dev->name);
1192 return;
1193 }
1194
1195 write_lock_irq(&mpc->egress_lock);
1196 mpc->eg_ops->remove_entry(entry, mpc);
1197 write_unlock_irq(&mpc->egress_lock);
1198
1199 mpc->eg_ops->put(entry);
1200
1201 return;
1202}
1203
1204static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
1205{
1206 struct sock *sk;
1207 struct k_message *purge_msg;
1208 struct sk_buff *skb;
1209
1210 dprintk("mpoa: purge_egress_shortcut: entering\n");
1211 if (vcc == NULL) {
1212 printk("mpoa: purge_egress_shortcut: vcc == NULL\n");
1213 return;
1214 }
1215
1216 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
1217 if (skb == NULL) {
1218 printk("mpoa: purge_egress_shortcut: out of memory\n");
1219 return;
1220 }
1221
1222 skb_put(skb, sizeof(struct k_message));
1223 memset(skb->data, 0, sizeof(struct k_message));
1224 purge_msg = (struct k_message *)skb->data;
1225 purge_msg->type = DATA_PLANE_PURGE;
1226 if (entry != NULL)
1227 purge_msg->content.eg_info = entry->ctrl_info;
1228
1229 atm_force_charge(vcc, skb->truesize);
1230
1231 sk = sk_atm(vcc);
1232 skb_queue_tail(&sk->sk_receive_queue, skb);
1233 sk->sk_data_ready(sk, skb->len);
1234 dprintk("mpoa: purge_egress_shortcut: exiting:\n");
1235
1236 return;
1237}
1238
1239/*
1240 * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1241 * of the egress shortcuts we have.
1242 */
1243static void mps_death( struct k_message * msg, struct mpoa_client * mpc )
1244{
1245 eg_cache_entry *entry;
1246
1247 dprintk("mpoa: (%s) mps_death:\n", mpc->dev->name);
1248
1249 if(memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)){
1250 printk("mpoa: (%s) mps_death: wrong MPS\n", mpc->dev->name);
1251 return;
1252 }
1253
1254 /* FIXME: This knows too much of the cache structure */
1255 read_lock_irq(&mpc->egress_lock);
1256 entry = mpc->eg_cache;
1257 while (entry != NULL) {
1258 purge_egress_shortcut(entry->shortcut, entry);
1259 entry = entry->next;
1260 }
1261 read_unlock_irq(&mpc->egress_lock);
1262
1263 mpc->in_ops->destroy_cache(mpc);
1264 mpc->eg_ops->destroy_cache(mpc);
1265
1266 return;
1267}
1268
1269static void MPOA_cache_impos_rcvd( struct k_message * msg, struct mpoa_client * mpc)
1270{
1271 uint16_t holding_time;
1272 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1273
1274 holding_time = msg->content.eg_info.holding_time;
1275 dprintk("mpoa: (%s) MPOA_cache_impos_rcvd: entry = %p, holding_time = %u\n",
1276 mpc->dev->name, entry, holding_time);
1277 if(entry == NULL && holding_time) {
1278 entry = mpc->eg_ops->add_entry(msg, mpc);
1279 mpc->eg_ops->put(entry);
1280 return;
1281 }
1282 if(holding_time){
1283 mpc->eg_ops->update(entry, holding_time);
1284 return;
1285 }
1286
1287 write_lock_irq(&mpc->egress_lock);
1288 mpc->eg_ops->remove_entry(entry, mpc);
1289 write_unlock_irq(&mpc->egress_lock);
1290
1291 mpc->eg_ops->put(entry);
1292
1293 return;
1294}
1295
1296static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc)
1297{
1298 struct lec_priv *priv;
1299 int i, retval ;
1300
1301 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1302
1303 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */
1304 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */
1305 tlv[5] = 0x02; /* MPOA client */
1306 tlv[6] = 0x00; /* number of MPS MAC addresses */
1307
1308 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1309 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1310
1311 dprintk("mpoa: (%s) setting MPC ctrl ATM address to ",
1312 (mpc->dev) ? mpc->dev->name : "<unknown>");
1313 for (i = 7; i < sizeof(tlv); i++)
1314 dprintk("%02x ", tlv[i]);
1315 dprintk("\n");
1316
1317 if (mpc->dev) {
1318 priv = (struct lec_priv *)mpc->dev->priv;
1319 retval = priv->lane2_ops->associate_req(mpc->dev, mpc->dev->dev_addr, tlv, sizeof(tlv));
1320 if (retval == 0)
1321 printk("mpoa: (%s) MPOA device type TLV association failed\n", mpc->dev->name);
1322 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1323 if (retval < 0)
1324 printk("mpoa: (%s) targetless LE_ARP request failed\n", mpc->dev->name);
1325 }
1326
1327 return;
1328}
1329
1330static void set_mps_mac_addr_rcvd(struct k_message *msg, struct mpoa_client *client)
1331{
1332
1333 if(client->number_of_mps_macs)
1334 kfree(client->mps_macs);
1335 client->number_of_mps_macs = 0;
1336 client->mps_macs = kmalloc(ETH_ALEN,GFP_KERNEL);
1337 if (client->mps_macs == NULL) {
1338 printk("mpoa: set_mps_mac_addr_rcvd: out of memory\n");
1339 return;
1340 }
1341 client->number_of_mps_macs = 1;
1342 memcpy(client->mps_macs, msg->MPS_ctrl, ETH_ALEN);
1343
1344 return;
1345}
1346
1347/*
1348 * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1349 */
1350static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1351{
1352
1353 eg_cache_entry *entry;
1354 msg->type = SND_EGRESS_PURGE;
1355
1356
1357 /* FIXME: This knows too much of the cache structure */
1358 read_lock_irq(&mpc->egress_lock);
1359 entry = mpc->eg_cache;
1360 while (entry != NULL){
1361 msg->content.eg_info = entry->ctrl_info;
1362 dprintk("mpoa: cache_id %u\n", entry->ctrl_info.cache_id);
1363 msg_to_mpoad(msg, mpc);
1364 entry = entry->next;
1365 }
1366 read_unlock_irq(&mpc->egress_lock);
1367
1368 msg->type = action;
1369 msg_to_mpoad(msg, mpc);
1370 return;
1371}
1372
1373static void mpc_timer_refresh(void)
1374{
1375 mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1376 mpc_timer.data = mpc_timer.expires;
1377 mpc_timer.function = mpc_cache_check;
1378 add_timer(&mpc_timer);
1379
1380 return;
1381}
1382
1383static void mpc_cache_check( unsigned long checking_time )
1384{
1385 struct mpoa_client *mpc = mpcs;
1386 static unsigned long previous_resolving_check_time;
1387 static unsigned long previous_refresh_time;
1388
1389 while( mpc != NULL ){
1390 mpc->in_ops->clear_count(mpc);
1391 mpc->eg_ops->clear_expired(mpc);
1392 if(checking_time - previous_resolving_check_time > mpc->parameters.mpc_p4 * HZ ){
1393 mpc->in_ops->check_resolving(mpc);
1394 previous_resolving_check_time = checking_time;
1395 }
1396 if(checking_time - previous_refresh_time > mpc->parameters.mpc_p5 * HZ ){
1397 mpc->in_ops->refresh(mpc);
1398 previous_refresh_time = checking_time;
1399 }
1400 mpc = mpc->next;
1401 }
1402 mpc_timer_refresh();
1403
1404 return;
1405}
1406
1407static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1408{
1409 int err = 0;
1410 struct atm_vcc *vcc = ATM_SD(sock);
1411
1412 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1413 return -ENOIOCTLCMD;
1414
1415 if (!capable(CAP_NET_ADMIN))
1416 return -EPERM;
1417
1418 switch (cmd) {
1419 case ATMMPC_CTRL:
1420 err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1421 if (err >= 0)
1422 sock->state = SS_CONNECTED;
1423 break;
1424 case ATMMPC_DATA:
1425 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1426 break;
1427 default:
1428 break;
1429 }
1430 return err;
1431}
1432
1433
1434static struct atm_ioctl atm_ioctl_ops = {
1435 .owner = THIS_MODULE,
1436 .ioctl = atm_mpoa_ioctl,
1437};
1438
1439static __init int atm_mpoa_init(void)
1440{
1441 register_atm_ioctl(&atm_ioctl_ops);
1442
1443#ifdef CONFIG_PROC_FS
1444 if (mpc_proc_init() != 0)
1445 printk(KERN_INFO "mpoa: failed to initialize /proc/mpoa\n");
1446 else
1447 printk(KERN_INFO "mpoa: /proc/mpoa initialized\n");
1448#endif
1449
1450 printk("mpc.c: " __DATE__ " " __TIME__ " initialized\n");
1451
1452 return 0;
1453}
1454
1455static 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#ifdef CONFIG_PROC_FS
1462 mpc_proc_clean();
1463#endif
1464
1465 del_timer(&mpc_timer);
1466 unregister_netdevice_notifier(&mpoa_notifier);
1467 deregister_atm_ioctl(&atm_ioctl_ops);
1468
1469 mpc = mpcs;
1470 mpcs = NULL;
1471 while (mpc != NULL) {
1472 tmp = mpc->next;
1473 if (mpc->dev != NULL) {
1474 stop_mpc(mpc);
1475 priv = (struct lec_priv *)mpc->dev->priv;
1476 if (priv->lane2_ops != NULL)
1477 priv->lane2_ops->associate_indicator = NULL;
1478 }
1479 ddprintk("mpoa: cleanup_module: about to clear caches\n");
1480 mpc->in_ops->destroy_cache(mpc);
1481 mpc->eg_ops->destroy_cache(mpc);
1482 ddprintk("mpoa: cleanup_module: caches cleared\n");
1483 kfree(mpc->mps_macs);
1484 memset(mpc, 0, sizeof(struct mpoa_client));
1485 ddprintk("mpoa: cleanup_module: about to kfree %p\n", mpc);
1486 kfree(mpc);
1487 ddprintk("mpoa: cleanup_module: next mpc is at %p\n", tmp);
1488 mpc = tmp;
1489 }
1490
1491 qos = qos_head;
1492 qos_head = NULL;
1493 while (qos != NULL) {
1494 nextqos = qos->next;
1495 dprintk("mpoa: cleanup_module: freeing qos entry %p\n", qos);
1496 kfree(qos);
1497 qos = nextqos;
1498 }
1499
1500 return;
1501}
1502
1503module_init(atm_mpoa_init);
1504module_exit(atm_mpoa_cleanup);
1505
1506MODULE_LICENSE("GPL");
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