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
7 /* We are an ethernet device */
8 #include <linux/if_ether.h>
9 #include <linux/netdevice.h>
10 #include <linux/etherdevice.h>
11 #include <net/sock.h>
12 #include <linux/skbuff.h>
13 #include <linux/ip.h>
14 #include <asm/byteorder.h>
15 #include <asm/uaccess.h>
16 #include <asm/checksum.h> /* for ip_fast_csum() */
17 #include <net/arp.h>
18 #include <net/dst.h>
19 #include <linux/proc_fs.h>
20
21 /* And atm device */
22 #include <linux/atmdev.h>
23 #include <linux/atmlec.h>
24 #include <linux/atmmpc.h>
25 /* Modular too */
26 #include <linux/config.h>
27 #include <linux/module.h>
28
29 #include "lec.h"
30 #include "mpc.h"
31 #include "resources.h"
32
33 /*
34 * mpc.c: Implementation of MPOA client kernel part
35 */
36
37 #if 0
38 #define dprintk printk /* debug */
39 #else
40 #define dprintk(format,args...)
41 #endif
42
43 #if 0
44 #define ddprintk printk /* more debug */
45 #else
46 #define ddprintk(format,args...)
47 #endif
48
49
50
51 #define MPOA_TAG_LEN 4
52
53 /* mpc_daemon -> kernel */
54 static void MPOA_trigger_rcvd (struct k_message *msg, struct mpoa_client *mpc);
55 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
56 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
57 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
58 static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
59 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action);
60 static void MPOA_cache_impos_rcvd(struct k_message *msg, struct mpoa_client *mpc);
61 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
62 static void set_mps_mac_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
63
64 static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
65 uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type);
66 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
67
68 static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc);
69 static void mpoad_close(struct atm_vcc *vcc);
70 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
71
72 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
73 static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev);
74 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev);
75 static void mpc_timer_refresh(void);
76 static void mpc_cache_check( unsigned long checking_time );
77
78 static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
79 0xaa, 0xaa, 0x03,
80 {0x00, 0x00, 0x5e},
81 {0x00, 0x03} /* For MPOA control PDUs */
82 };
83 static struct llc_snap_hdr llc_snap_mpoa_data = {
84 0xaa, 0xaa, 0x03,
85 {0x00, 0x00, 0x00},
86 {0x08, 0x00} /* This is for IP PDUs only */
87 };
88 static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
89 0xaa, 0xaa, 0x03,
90 {0x00, 0x00, 0x00},
91 {0x88, 0x4c} /* This is for tagged data PDUs */
92 };
93
94 static struct notifier_block mpoa_notifier = {
95 mpoa_event_listener,
96 NULL,
97 0
98 };
99
100 #ifdef CONFIG_PROC_FS
101 extern int mpc_proc_init(void);
102 extern void mpc_proc_clean(void);
103 #endif
104
105 struct mpoa_client *mpcs = NULL; /* FIXME */
106 static struct atm_mpoa_qos *qos_head = NULL;
107 static struct timer_list mpc_timer;
108
109
find_mpc_by_itfnum(int itf)110 static struct mpoa_client *find_mpc_by_itfnum(int itf)
111 {
112 struct mpoa_client *mpc;
113
114 mpc = mpcs; /* our global linked list */
115 while (mpc != NULL) {
116 if (mpc->dev_num == itf)
117 return mpc;
118 mpc = mpc->next;
119 }
120
121 return NULL; /* not found */
122 }
123
find_mpc_by_vcc(struct atm_vcc * vcc)124 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
125 {
126 struct mpoa_client *mpc;
127
128 mpc = mpcs; /* our global linked list */
129 while (mpc != NULL) {
130 if (mpc->mpoad_vcc == vcc)
131 return mpc;
132 mpc = mpc->next;
133 }
134
135 return NULL; /* not found */
136 }
137
find_mpc_by_lec(struct net_device * dev)138 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
139 {
140 struct mpoa_client *mpc;
141
142 mpc = mpcs; /* our global linked list */
143 while (mpc != NULL) {
144 if (mpc->dev == dev)
145 return mpc;
146 mpc = mpc->next;
147 }
148
149 return NULL; /* not found */
150 }
151
152 /*
153 * Functions for managing QoS list
154 */
155
156 /*
157 * Overwrites the old entry or makes a new one.
158 */
atm_mpoa_add_qos(uint32_t dst_ip,struct atm_qos * qos)159 struct atm_mpoa_qos *atm_mpoa_add_qos(uint32_t dst_ip, struct atm_qos *qos)
160 {
161 struct atm_mpoa_qos *entry;
162
163 entry = atm_mpoa_search_qos(dst_ip);
164 if (entry != NULL) {
165 entry->qos = *qos;
166 return entry;
167 }
168
169 entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
170 if (entry == NULL) {
171 printk("mpoa: atm_mpoa_add_qos: out of memory\n");
172 return entry;
173 }
174
175 entry->ipaddr = dst_ip;
176 entry->qos = *qos;
177
178 entry->next = qos_head;
179 qos_head = entry;
180
181 return entry;
182 }
183
atm_mpoa_search_qos(uint32_t dst_ip)184 struct atm_mpoa_qos *atm_mpoa_search_qos(uint32_t dst_ip)
185 {
186 struct atm_mpoa_qos *qos;
187
188 qos = qos_head;
189 while( qos != NULL ){
190 if(qos->ipaddr == dst_ip) {
191 break;
192 }
193 qos = qos->next;
194 }
195
196 return qos;
197 }
198
199 /*
200 * Returns 0 for failure
201 */
atm_mpoa_delete_qos(struct atm_mpoa_qos * entry)202 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
203 {
204
205 struct atm_mpoa_qos *curr;
206
207 if (entry == NULL) return 0;
208 if (entry == qos_head) {
209 qos_head = qos_head->next;
210 kfree(entry);
211 return 1;
212 }
213
214 curr = qos_head;
215 while (curr != NULL) {
216 if (curr->next == entry) {
217 curr->next = entry->next;
218 kfree(entry);
219 return 1;
220 }
221 curr = curr->next;
222 }
223
224 return 0;
225 }
226
atm_mpoa_disp_qos(char * page,int * len)227 void atm_mpoa_disp_qos(char *page, int *len)
228 {
229
230 unsigned char *ip;
231 char ipaddr[16];
232 struct atm_mpoa_qos *qos;
233
234 qos = qos_head;
235 *len += sprintf(page + *len, "QoS entries for shortcuts:\n");
236 *len += sprintf(page + *len, "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");
237
238 ipaddr[sizeof(ipaddr)-1] = '\0';
239 while (qos != NULL) {
240 ip = (unsigned char *)&qos->ipaddr;
241 sprintf(ipaddr, "%u.%u.%u.%u", NIPQUAD(ip));
242 *len += sprintf(page + *len, "%u.%u.%u.%u\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n",
243 NIPQUAD(ipaddr),
244 qos->qos.txtp.max_pcr, qos->qos.txtp.pcr, qos->qos.txtp.min_pcr, qos->qos.txtp.max_cdv, qos->qos.txtp.max_sdu,
245 qos->qos.rxtp.max_pcr, qos->qos.rxtp.pcr, qos->qos.rxtp.min_pcr, qos->qos.rxtp.max_cdv, qos->qos.rxtp.max_sdu);
246 qos = qos->next;
247 }
248
249 return;
250 }
251
find_lec_by_itfnum(int itf)252 static struct net_device *find_lec_by_itfnum(int itf)
253 {
254 struct net_device *dev;
255 if (!try_atm_lane_ops())
256 return NULL;
257
258 dev = atm_lane_ops->get_lec(itf);
259 if (atm_lane_ops->owner)
260 __MOD_DEC_USE_COUNT(atm_lane_ops->owner);
261 return dev;
262 }
263
alloc_mpc(void)264 static struct mpoa_client *alloc_mpc(void)
265 {
266 struct mpoa_client *mpc;
267
268 mpc = kmalloc(sizeof (struct mpoa_client), GFP_KERNEL);
269 if (mpc == NULL)
270 return NULL;
271 memset(mpc, 0, sizeof(struct mpoa_client));
272 mpc->ingress_lock = RW_LOCK_UNLOCKED;
273 mpc->egress_lock = RW_LOCK_UNLOCKED;
274 mpc->next = mpcs;
275 atm_mpoa_init_cache(mpc);
276
277 mpc->parameters.mpc_p1 = MPC_P1;
278 mpc->parameters.mpc_p2 = MPC_P2;
279 memset(mpc->parameters.mpc_p3,0,sizeof(mpc->parameters.mpc_p3));
280 mpc->parameters.mpc_p4 = MPC_P4;
281 mpc->parameters.mpc_p5 = MPC_P5;
282 mpc->parameters.mpc_p6 = MPC_P6;
283
284 mpcs = mpc;
285
286 return mpc;
287 }
288
289 /*
290 *
291 * start_mpc() puts the MPC on line. All the packets destined
292 * to the lec underneath us are now being monitored and
293 * shortcuts will be established.
294 *
295 */
start_mpc(struct mpoa_client * mpc,struct net_device * dev)296 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
297 {
298
299 dprintk("mpoa: (%s) start_mpc:\n", mpc->dev->name);
300 if (dev->hard_start_xmit == NULL) {
301 printk("mpoa: (%s) start_mpc: dev->hard_start_xmit == NULL, not starting\n",
302 dev->name);
303 return;
304 }
305 mpc->old_hard_start_xmit = dev->hard_start_xmit;
306 dev->hard_start_xmit = mpc_send_packet;
307
308 return;
309 }
310
stop_mpc(struct mpoa_client * mpc)311 static void stop_mpc(struct mpoa_client *mpc)
312 {
313
314 dprintk("mpoa: (%s) stop_mpc:", mpc->dev->name);
315
316 /* Lets not nullify lec device's dev->hard_start_xmit */
317 if (mpc->dev->hard_start_xmit != mpc_send_packet) {
318 dprintk(" mpc already stopped, not fatal\n");
319 return;
320 }
321 dprintk("\n");
322 mpc->dev->hard_start_xmit = mpc->old_hard_start_xmit;
323 mpc->old_hard_start_xmit = NULL;
324 /* close_shortcuts(mpc); ??? FIXME */
325
326 return;
327 }
328
mpoa_device_type_string(char type)329 static const char * __attribute__ ((unused)) mpoa_device_type_string(char type)
330 {
331 switch(type) {
332 case NON_MPOA:
333 return "non-MPOA device";
334 break;
335 case MPS:
336 return "MPS";
337 break;
338 case MPC:
339 return "MPC";
340 break;
341 case MPS_AND_MPC:
342 return "both MPS and MPC";
343 break;
344 default:
345 return "unspecified (non-MPOA) device";
346 break;
347 }
348
349 return ""; /* not reached */
350 }
351
352 /*
353 * lec device calls this via its dev->priv->lane2_ops->associate_indicator()
354 * when it sees a TLV in LE_ARP packet.
355 * We fill in the pointer above when we see a LANE2 lec initializing
356 * See LANE2 spec 3.1.5
357 *
358 * Quite a big and ugly function but when you look at it
359 * all it does is to try to locate and parse MPOA Device
360 * Type TLV.
361 * We give our lec a pointer to this function and when the
362 * lec sees a TLV it uses the pointer to call this function.
363 *
364 */
lane2_assoc_ind(struct net_device * dev,uint8_t * mac_addr,uint8_t * tlvs,uint32_t sizeoftlvs)365 static void lane2_assoc_ind(struct net_device *dev, uint8_t *mac_addr,
366 uint8_t *tlvs, uint32_t sizeoftlvs)
367 {
368 uint32_t type;
369 uint8_t length, mpoa_device_type, number_of_mps_macs;
370 uint8_t *end_of_tlvs;
371 struct mpoa_client *mpc;
372
373 mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
374 dprintk("mpoa: (%s) lane2_assoc_ind: received TLV(s), ", dev->name);
375 dprintk("total length of all TLVs %d\n", sizeoftlvs);
376 mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
377 if (mpc == NULL) {
378 printk("mpoa: (%s) lane2_assoc_ind: no mpc\n", dev->name);
379 return;
380 }
381 end_of_tlvs = tlvs + sizeoftlvs;
382 while (end_of_tlvs - tlvs >= 5) {
383 type = (tlvs[0] << 24) | (tlvs[1] << 16) | (tlvs[2] << 8) | tlvs[3];
384 length = tlvs[4];
385 tlvs += 5;
386 dprintk(" type 0x%x length %02x\n", type, length);
387 if (tlvs + length > end_of_tlvs) {
388 printk("TLV value extends past its buffer, aborting parse\n");
389 return;
390 }
391
392 if (type == 0) {
393 printk("mpoa: (%s) lane2_assoc_ind: TLV type was 0, returning\n", dev->name);
394 return;
395 }
396
397 if (type != TLV_MPOA_DEVICE_TYPE) {
398 tlvs += length;
399 continue; /* skip other TLVs */
400 }
401 mpoa_device_type = *tlvs++;
402 number_of_mps_macs = *tlvs++;
403 dprintk("mpoa: (%s) MPOA device type '%s', ", dev->name, mpoa_device_type_string(mpoa_device_type));
404 if (mpoa_device_type == MPS_AND_MPC &&
405 length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
406 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
407 dev->name);
408 continue;
409 }
410 if ((mpoa_device_type == MPS || mpoa_device_type == MPC)
411 && length < 22 + number_of_mps_macs*ETH_ALEN) {
412 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
413 dev->name);
414 continue;
415 }
416 if (mpoa_device_type != MPS && mpoa_device_type != MPS_AND_MPC) {
417 dprintk("ignoring non-MPS device\n");
418 if (mpoa_device_type == MPC) tlvs += 20;
419 continue; /* we are only interested in MPSs */
420 }
421 if (number_of_mps_macs == 0 && mpoa_device_type == MPS_AND_MPC) {
422 printk("\nmpoa: (%s) lane2_assoc_ind: MPS_AND_MPC has zero MACs\n", dev->name);
423 continue; /* someone should read the spec */
424 }
425 dprintk("this MPS has %d MAC addresses\n", number_of_mps_macs);
426
427 /* ok, now we can go and tell our daemon the control address of MPS */
428 send_set_mps_ctrl_addr(tlvs, mpc);
429
430 tlvs = copy_macs(mpc, mac_addr, tlvs, number_of_mps_macs, mpoa_device_type);
431 if (tlvs == NULL) return;
432 }
433 if (end_of_tlvs - tlvs != 0)
434 printk("mpoa: (%s) lane2_assoc_ind: ignoring %d bytes of trailing TLV carbage\n",
435 dev->name, end_of_tlvs - tlvs);
436 return;
437 }
438
439 /*
440 * Store at least advertizing router's MAC address
441 * plus the possible MAC address(es) to mpc->mps_macs.
442 * For a freshly allocated MPOA client mpc->mps_macs == 0.
443 */
copy_macs(struct mpoa_client * mpc,uint8_t * router_mac,uint8_t * tlvs,uint8_t mps_macs,uint8_t device_type)444 static uint8_t *copy_macs(struct mpoa_client *mpc, uint8_t *router_mac,
445 uint8_t *tlvs, uint8_t mps_macs, uint8_t device_type)
446 {
447 int num_macs;
448 num_macs = (mps_macs > 1) ? mps_macs : 1;
449
450 if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
451 if (mpc->number_of_mps_macs != 0) kfree(mpc->mps_macs);
452 mpc->number_of_mps_macs = 0;
453 mpc->mps_macs = kmalloc(num_macs*ETH_ALEN, GFP_KERNEL);
454 if (mpc->mps_macs == NULL) {
455 printk("mpoa: (%s) copy_macs: out of mem\n", mpc->dev->name);
456 return NULL;
457 }
458 }
459 memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
460 tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
461 if (mps_macs > 0)
462 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
463 tlvs += mps_macs*ETH_ALEN;
464 mpc->number_of_mps_macs = num_macs;
465
466 return tlvs;
467 }
468
send_via_shortcut(struct sk_buff * skb,struct mpoa_client * mpc)469 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
470 {
471 in_cache_entry *entry;
472 struct iphdr *iph;
473 char *buff;
474 uint32_t ipaddr = 0;
475
476 static struct {
477 struct llc_snap_hdr hdr;
478 uint32_t tag;
479 } tagged_llc_snap_hdr = {
480 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
481 0
482 };
483
484 buff = skb->data + mpc->dev->hard_header_len;
485 iph = (struct iphdr *)buff;
486 ipaddr = iph->daddr;
487
488 ddprintk("mpoa: (%s) send_via_shortcut: ipaddr 0x%x\n", mpc->dev->name, ipaddr);
489
490 entry = mpc->in_ops->get(ipaddr, mpc);
491 if (entry == NULL) {
492 entry = mpc->in_ops->add_entry(ipaddr, mpc);
493 if (entry != NULL) mpc->in_ops->put(entry);
494 return 1;
495 }
496 if (mpc->in_ops->cache_hit(entry, mpc) != OPEN){ /* threshold not exceeded or VCC not ready */
497 ddprintk("mpoa: (%s) send_via_shortcut: cache_hit: returns != OPEN\n", mpc->dev->name);
498 mpc->in_ops->put(entry);
499 return 1;
500 }
501
502 ddprintk("mpoa: (%s) send_via_shortcut: using shortcut\n", mpc->dev->name);
503 /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
504 if (iph->ttl <= 1) {
505 ddprintk("mpoa: (%s) send_via_shortcut: IP ttl = %u, using LANE\n", mpc->dev->name, iph->ttl);
506 mpc->in_ops->put(entry);
507 return 1;
508 }
509 iph->ttl--;
510 iph->check = 0;
511 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
512
513 if (entry->ctrl_info.tag != 0) {
514 ddprintk("mpoa: (%s) send_via_shortcut: adding tag 0x%x\n", mpc->dev->name, entry->ctrl_info.tag);
515 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
516 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
517 skb_push(skb, sizeof(tagged_llc_snap_hdr)); /* add LLC/SNAP header */
518 memcpy(skb->data, &tagged_llc_snap_hdr, sizeof(tagged_llc_snap_hdr));
519 } else {
520 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
521 skb_push(skb, sizeof(struct llc_snap_hdr)); /* add LLC/SNAP header + tag */
522 memcpy(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr));
523 }
524
525 atomic_add(skb->truesize, &entry->shortcut->sk->wmem_alloc);
526 ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
527 entry->shortcut->send(entry->shortcut, skb);
528 entry->packets_fwded++;
529 mpc->in_ops->put(entry);
530
531 return 0;
532 }
533
534 /*
535 * Probably needs some error checks and locking, not sure...
536 */
mpc_send_packet(struct sk_buff * skb,struct net_device * dev)537 static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev)
538 {
539 int retval;
540 struct mpoa_client *mpc;
541 struct ethhdr *eth;
542 int i = 0;
543
544 mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
545 if(mpc == NULL) {
546 printk("mpoa: (%s) mpc_send_packet: no MPC found\n", dev->name);
547 goto non_ip;
548 }
549
550 eth = (struct ethhdr *)skb->data;
551 if (eth->h_proto != htons(ETH_P_IP))
552 goto non_ip; /* Multi-Protocol Over ATM :-) */
553
554 while (i < mpc->number_of_mps_macs) {
555 if (memcmp(eth->h_dest, (mpc->mps_macs + i*ETH_ALEN), ETH_ALEN) == 0)
556 if ( send_via_shortcut(skb, mpc) == 0 ) /* try shortcut */
557 return 0; /* success! */
558 i++;
559 }
560
561 non_ip:
562 retval = mpc->old_hard_start_xmit(skb,dev);
563
564 return retval;
565 }
566
atm_mpoa_vcc_attach(struct atm_vcc * vcc,long arg)567 int atm_mpoa_vcc_attach(struct atm_vcc *vcc, long arg)
568 {
569 int bytes_left;
570 struct mpoa_client *mpc;
571 struct atmmpc_ioc ioc_data;
572 in_cache_entry *in_entry;
573 uint32_t ipaddr;
574 unsigned char *ip;
575
576 bytes_left = copy_from_user(&ioc_data, (void *)arg, sizeof(struct atmmpc_ioc));
577 if (bytes_left != 0) {
578 printk("mpoa: mpc_vcc_attach: Short read (missed %d bytes) from userland\n", bytes_left);
579 return -EFAULT;
580 }
581 ipaddr = ioc_data.ipaddr;
582 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
583 return -EINVAL;
584
585 mpc = find_mpc_by_itfnum(ioc_data.dev_num);
586 if (mpc == NULL)
587 return -EINVAL;
588
589 if (ioc_data.type == MPC_SOCKET_INGRESS) {
590 in_entry = mpc->in_ops->get(ipaddr, mpc);
591 if (in_entry == NULL || in_entry->entry_state < INGRESS_RESOLVED) {
592 printk("mpoa: (%s) mpc_vcc_attach: did not find RESOLVED entry from ingress cache\n",
593 mpc->dev->name);
594 if (in_entry != NULL) mpc->in_ops->put(in_entry);
595 return -EINVAL;
596 }
597 ip = (unsigned char*)&in_entry->ctrl_info.in_dst_ip;
598 printk("mpoa: (%s) mpc_vcc_attach: attaching ingress SVC, entry = %u.%u.%u.%u\n",
599 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
600 in_entry->shortcut = vcc;
601 mpc->in_ops->put(in_entry);
602 } else {
603 printk("mpoa: (%s) mpc_vcc_attach: attaching egress SVC\n", mpc->dev->name);
604 }
605
606 vcc->proto_data = mpc->dev;
607 vcc->push = mpc_push;
608
609 return 0;
610 }
611
612 /*
613 *
614 */
mpc_vcc_close(struct atm_vcc * vcc,struct net_device * dev)615 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
616 {
617 struct mpoa_client *mpc;
618 in_cache_entry *in_entry;
619 eg_cache_entry *eg_entry;
620
621 mpc = find_mpc_by_lec(dev);
622 if (mpc == NULL) {
623 printk("mpoa: (%s) mpc_vcc_close: close for unknown MPC\n", dev->name);
624 return;
625 }
626
627 dprintk("mpoa: (%s) mpc_vcc_close:\n", dev->name);
628 in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
629 if (in_entry) {
630 unsigned char *ip __attribute__ ((unused)) =
631 (unsigned char *)&in_entry->ctrl_info.in_dst_ip;
632 dprintk("mpoa: (%s) mpc_vcc_close: ingress SVC closed ip = %u.%u.%u.%u\n",
633 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
634 in_entry->shortcut = NULL;
635 mpc->in_ops->put(in_entry);
636 }
637 eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
638 if (eg_entry) {
639 dprintk("mpoa: (%s) mpc_vcc_close: egress SVC closed\n", mpc->dev->name);
640 eg_entry->shortcut = NULL;
641 mpc->eg_ops->put(eg_entry);
642 }
643
644 if (in_entry == NULL && eg_entry == NULL)
645 dprintk("mpoa: (%s) mpc_vcc_close: unused vcc closed\n", dev->name);
646
647 return;
648 }
649
mpc_push(struct atm_vcc * vcc,struct sk_buff * skb)650 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
651 {
652 struct net_device *dev = (struct net_device *)vcc->proto_data;
653 struct sk_buff *new_skb;
654 eg_cache_entry *eg;
655 struct mpoa_client *mpc;
656 uint32_t tag;
657 char *tmp;
658
659 ddprintk("mpoa: (%s) mpc_push:\n", dev->name);
660 if (skb == NULL) {
661 dprintk("mpoa: (%s) mpc_push: null skb, closing VCC\n", dev->name);
662 mpc_vcc_close(vcc, dev);
663 return;
664 }
665
666 skb->dev = dev;
667 if (memcmp(skb->data, &llc_snap_mpoa_ctrl, sizeof(struct llc_snap_hdr)) == 0) {
668 dprintk("mpoa: (%s) mpc_push: control packet arrived\n", dev->name);
669 skb_queue_tail(&vcc->sk->receive_queue, skb); /* Pass control packets to daemon */
670 wake_up(&vcc->sleep);
671 return;
672 }
673
674 /* data coming over the shortcut */
675 atm_return(vcc, skb->truesize);
676
677 mpc = find_mpc_by_lec(dev);
678 if (mpc == NULL) {
679 printk("mpoa: (%s) mpc_push: unknown MPC\n", dev->name);
680 return;
681 }
682
683 if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
684 ddprintk("mpoa: (%s) mpc_push: tagged data packet arrived\n", dev->name);
685
686 } else if (memcmp(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
687 printk("mpoa: (%s) mpc_push: non-tagged data packet arrived\n", dev->name);
688 printk(" mpc_push: non-tagged data unsupported, purging\n");
689 dev_kfree_skb_any(skb);
690 return;
691 } else {
692 printk("mpoa: (%s) mpc_push: garbage arrived, purging\n", dev->name);
693 dev_kfree_skb_any(skb);
694 return;
695 }
696
697 tmp = skb->data + sizeof(struct llc_snap_hdr);
698 tag = *(uint32_t *)tmp;
699
700 eg = mpc->eg_ops->get_by_tag(tag, mpc);
701 if (eg == NULL) {
702 printk("mpoa: (%s) mpc_push: Didn't find egress cache entry, tag = %u\n",
703 dev->name,tag);
704 purge_egress_shortcut(vcc, NULL);
705 dev_kfree_skb_any(skb);
706 return;
707 }
708
709 /*
710 * See if ingress MPC is using shortcut we opened as a return channel.
711 * This means we have a bi-directional vcc opened by us.
712 */
713 if (eg->shortcut == NULL) {
714 eg->shortcut = vcc;
715 printk("mpoa: (%s) mpc_push: egress SVC in use\n", dev->name);
716 }
717
718 skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); /* get rid of LLC/SNAP header */
719 new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); /* LLC/SNAP is shorter than MAC header :( */
720 dev_kfree_skb_any(skb);
721 if (new_skb == NULL){
722 mpc->eg_ops->put(eg);
723 return;
724 }
725 skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */
726 memcpy(new_skb->data, eg->ctrl_info.DLL_header, eg->ctrl_info.DH_length);
727 new_skb->protocol = eth_type_trans(new_skb, dev);
728 new_skb->nh.raw = new_skb->data;
729
730 eg->latest_ip_addr = new_skb->nh.iph->saddr;
731 eg->packets_rcvd++;
732 mpc->eg_ops->put(eg);
733
734 memset(ATM_SKB(new_skb), 0, sizeof(struct atm_skb_data));
735 netif_rx(new_skb);
736
737 return;
738 }
739
740 static struct atmdev_ops mpc_ops = { /* only send is required */
741 .close = mpoad_close,
742 .send = msg_from_mpoad
743 };
744
745 static struct atm_dev mpc_dev = {
746 .ops = &mpc_ops,
747 .type = "mpc",
748 .number = 42,
749 .lock = SPIN_LOCK_UNLOCKED
750 /* rest of the members will be 0 */
751 };
752
atm_mpoa_mpoad_attach(struct atm_vcc * vcc,int arg)753 int atm_mpoa_mpoad_attach (struct atm_vcc *vcc, int arg)
754 {
755 struct mpoa_client *mpc;
756 struct lec_priv *priv;
757
758 if (mpcs == NULL) {
759 init_timer(&mpc_timer);
760 mpc_timer_refresh();
761
762 /* This lets us now how our LECs are doing */
763 register_netdevice_notifier(&mpoa_notifier);
764 }
765
766 mpc = find_mpc_by_itfnum(arg);
767 if (mpc == NULL) {
768 dprintk("mpoa: mpoad_attach: allocating new mpc for itf %d\n", arg);
769 mpc = alloc_mpc();
770 if (mpc == NULL)
771 return -ENOMEM;
772 mpc->dev_num = arg;
773 mpc->dev = find_lec_by_itfnum(arg); /* NULL if there was no lec */
774 }
775 if (mpc->mpoad_vcc) {
776 printk("mpoa: mpoad_attach: mpoad is already present for itf %d\n", arg);
777 return -EADDRINUSE;
778 }
779
780 if (mpc->dev) { /* check if the lec is LANE2 capable */
781 priv = (struct lec_priv *)mpc->dev->priv;
782 if (priv->lane_version < 2) {
783 dev_put(mpc->dev);
784 mpc->dev = NULL;
785 } else
786 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
787 }
788
789 mpc->mpoad_vcc = vcc;
790 vcc->dev = &mpc_dev;
791 vcc_insert_socket(vcc->sk);
792 set_bit(ATM_VF_META,&vcc->flags);
793 set_bit(ATM_VF_READY,&vcc->flags);
794
795 if (mpc->dev) {
796 char empty[ATM_ESA_LEN];
797 memset(empty, 0, ATM_ESA_LEN);
798
799 start_mpc(mpc, mpc->dev);
800 /* set address if mpcd e.g. gets killed and restarted.
801 * If we do not do it now we have to wait for the next LE_ARP
802 */
803 if ( memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0 )
804 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
805 }
806
807 MOD_INC_USE_COUNT;
808 return arg;
809 }
810
send_set_mps_ctrl_addr(char * addr,struct mpoa_client * mpc)811 static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc)
812 {
813 struct k_message mesg;
814
815 memcpy (mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
816
817 mesg.type = SET_MPS_CTRL_ADDR;
818 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
819 msg_to_mpoad(&mesg, mpc);
820
821 return;
822 }
823
mpoad_close(struct atm_vcc * vcc)824 static void mpoad_close(struct atm_vcc *vcc)
825 {
826 struct mpoa_client *mpc;
827 struct sk_buff *skb;
828
829 mpc = find_mpc_by_vcc(vcc);
830 if (mpc == NULL) {
831 printk("mpoa: mpoad_close: did not find MPC\n");
832 return;
833 }
834 if (!mpc->mpoad_vcc) {
835 printk("mpoa: mpoad_close: close for non-present mpoad\n");
836 return;
837 }
838
839 mpc->mpoad_vcc = NULL;
840 if (mpc->dev) {
841 struct lec_priv *priv = (struct lec_priv *)mpc->dev->priv;
842 priv->lane2_ops->associate_indicator = NULL;
843 stop_mpc(mpc);
844 dev_put(mpc->dev);
845 }
846
847 mpc->in_ops->destroy_cache(mpc);
848 mpc->eg_ops->destroy_cache(mpc);
849
850 while ( (skb = skb_dequeue(&vcc->sk->receive_queue)) ){
851 atm_return(vcc, skb->truesize);
852 kfree_skb(skb);
853 }
854
855 printk("mpoa: (%s) going down\n",
856 (mpc->dev) ? mpc->dev->name : "<unknown>");
857 MOD_DEC_USE_COUNT;
858
859 return;
860 }
861
862 /*
863 *
864 */
msg_from_mpoad(struct atm_vcc * vcc,struct sk_buff * skb)865 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
866 {
867
868 struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
869 struct k_message *mesg = (struct k_message*)skb->data;
870 atomic_sub(skb->truesize, &vcc->sk->wmem_alloc);
871
872 if (mpc == NULL) {
873 printk("mpoa: msg_from_mpoad: no mpc found\n");
874 return 0;
875 }
876 dprintk("mpoa: (%s) msg_from_mpoad:", (mpc->dev) ? mpc->dev->name : "<unknown>");
877 switch(mesg->type) {
878 case MPOA_RES_REPLY_RCVD:
879 dprintk(" mpoa_res_reply_rcvd\n");
880 MPOA_res_reply_rcvd(mesg, mpc);
881 break;
882 case MPOA_TRIGGER_RCVD:
883 dprintk(" mpoa_trigger_rcvd\n");
884 MPOA_trigger_rcvd(mesg, mpc);
885 break;
886 case INGRESS_PURGE_RCVD:
887 dprintk(" nhrp_purge_rcvd\n");
888 ingress_purge_rcvd(mesg, mpc);
889 break;
890 case EGRESS_PURGE_RCVD:
891 dprintk(" egress_purge_reply_rcvd\n");
892 egress_purge_rcvd(mesg, mpc);
893 break;
894 case MPS_DEATH:
895 dprintk(" mps_death\n");
896 mps_death(mesg, mpc);
897 break;
898 case CACHE_IMPOS_RCVD:
899 dprintk(" cache_impos_rcvd\n");
900 MPOA_cache_impos_rcvd(mesg, mpc);
901 break;
902 case SET_MPC_CTRL_ADDR:
903 dprintk(" set_mpc_ctrl_addr\n");
904 set_mpc_ctrl_addr_rcvd(mesg, mpc);
905 break;
906 case SET_MPS_MAC_ADDR:
907 dprintk(" set_mps_mac_addr\n");
908 set_mps_mac_addr_rcvd(mesg, mpc);
909 break;
910 case CLEAN_UP_AND_EXIT:
911 dprintk(" clean_up_and_exit\n");
912 clean_up(mesg, mpc, DIE);
913 break;
914 case RELOAD:
915 dprintk(" reload\n");
916 clean_up(mesg, mpc, RELOAD);
917 break;
918 case SET_MPC_PARAMS:
919 dprintk(" set_mpc_params\n");
920 mpc->parameters = mesg->content.params;
921 break;
922 default:
923 dprintk(" unknown message %d\n", mesg->type);
924 break;
925 }
926 kfree_skb(skb);
927
928 return 0;
929 }
930
931 /* Remember that this function may not do things that sleep */
msg_to_mpoad(struct k_message * mesg,struct mpoa_client * mpc)932 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
933 {
934 struct sk_buff *skb;
935
936 if (mpc == NULL || !mpc->mpoad_vcc) {
937 printk("mpoa: msg_to_mpoad: mesg %d to a non-existent mpoad\n", mesg->type);
938 return -ENXIO;
939 }
940
941 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
942 if (skb == NULL)
943 return -ENOMEM;
944 skb_put(skb, sizeof(struct k_message));
945 memcpy(skb->data, mesg, sizeof(struct k_message));
946 atm_force_charge(mpc->mpoad_vcc, skb->truesize);
947 skb_queue_tail(&mpc->mpoad_vcc->sk->receive_queue, skb);
948 wake_up(&mpc->mpoad_vcc->sleep);
949
950 return 0;
951 }
952
mpoa_event_listener(struct notifier_block * mpoa_notifier,unsigned long event,void * dev_ptr)953 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev_ptr)
954 {
955 struct net_device *dev;
956 struct mpoa_client *mpc;
957 struct lec_priv *priv;
958
959 dev = (struct net_device *)dev_ptr;
960 if (dev->name == NULL || strncmp(dev->name, "lec", 3))
961 return NOTIFY_DONE; /* we are only interested in lec:s */
962
963 switch (event) {
964 case NETDEV_REGISTER: /* a new lec device was allocated */
965 priv = (struct lec_priv *)dev->priv;
966 if (priv->lane_version < 2)
967 break;
968 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
969 mpc = find_mpc_by_itfnum(priv->itfnum);
970 if (mpc == NULL) {
971 dprintk("mpoa: mpoa_event_listener: allocating new mpc for %s\n",
972 dev->name);
973 mpc = alloc_mpc();
974 if (mpc == NULL) {
975 printk("mpoa: mpoa_event_listener: no new mpc");
976 break;
977 }
978 }
979 mpc->dev_num = priv->itfnum;
980 mpc->dev = dev;
981 dev_hold(dev);
982 dprintk("mpoa: (%s) was initialized\n", dev->name);
983 break;
984 case NETDEV_UNREGISTER:
985 /* the lec device was deallocated */
986 mpc = find_mpc_by_lec(dev);
987 if (mpc == NULL)
988 break;
989 dprintk("mpoa: device (%s) was deallocated\n", dev->name);
990 stop_mpc(mpc);
991 dev_put(mpc->dev);
992 mpc->dev = NULL;
993 break;
994 case NETDEV_UP:
995 /* the dev was ifconfig'ed up */
996 mpc = find_mpc_by_lec(dev);
997 if (mpc == NULL)
998 break;
999 if (mpc->mpoad_vcc != NULL) {
1000 start_mpc(mpc, dev);
1001 }
1002 break;
1003 case NETDEV_DOWN:
1004 /* the dev was ifconfig'ed down */
1005 /* this means that the flow of packets from the
1006 * upper layer stops
1007 */
1008 mpc = find_mpc_by_lec(dev);
1009 if (mpc == NULL)
1010 break;
1011 if (mpc->mpoad_vcc != NULL) {
1012 stop_mpc(mpc);
1013 }
1014 break;
1015 case NETDEV_REBOOT:
1016 case NETDEV_CHANGE:
1017 case NETDEV_CHANGEMTU:
1018 case NETDEV_CHANGEADDR:
1019 case NETDEV_GOING_DOWN:
1020 break;
1021 default:
1022 break;
1023 }
1024
1025 return NOTIFY_DONE;
1026 }
1027
1028 /*
1029 * Functions which are called after a message is received from mpcd.
1030 * Msg is reused on purpose.
1031 */
1032
1033
MPOA_trigger_rcvd(struct k_message * msg,struct mpoa_client * mpc)1034 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1035 {
1036 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1037 in_cache_entry *entry;
1038
1039 entry = mpc->in_ops->get(dst_ip, mpc);
1040 if(entry == NULL){
1041 entry = mpc->in_ops->add_entry(dst_ip, mpc);
1042 entry->entry_state = INGRESS_RESOLVING;
1043 msg->type = SND_MPOA_RES_RQST;
1044 msg->content.in_info = entry->ctrl_info;
1045 msg_to_mpoad(msg, mpc);
1046 do_gettimeofday(&(entry->reply_wait));
1047 mpc->in_ops->put(entry);
1048 return;
1049 }
1050
1051 if(entry->entry_state == INGRESS_INVALID){
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 printk("mpoa: (%s) MPOA_trigger_rcvd: entry already in resolving state\n",
1062 (mpc->dev) ? mpc->dev->name : "<unknown>");
1063 mpc->in_ops->put(entry);
1064 return;
1065 }
1066
1067 /*
1068 * Things get complicated because we have to check if there's an egress
1069 * shortcut with suitable traffic parameters we could use.
1070 */
check_qos_and_open_shortcut(struct k_message * msg,struct mpoa_client * client,in_cache_entry * entry)1071 static void check_qos_and_open_shortcut(struct k_message *msg, struct mpoa_client *client, in_cache_entry *entry)
1072 {
1073 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1074 unsigned char *ip __attribute__ ((unused)) = (unsigned char *)&dst_ip;
1075 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1076 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1077
1078 if(eg_entry && eg_entry->shortcut){
1079 if(eg_entry->shortcut->qos.txtp.traffic_class &
1080 msg->qos.txtp.traffic_class &
1081 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)){
1082 if(eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1083 entry->shortcut = eg_entry->shortcut;
1084 else if(eg_entry->shortcut->qos.txtp.max_pcr > 0)
1085 entry->shortcut = eg_entry->shortcut;
1086 }
1087 if(entry->shortcut){
1088 dprintk("mpoa: (%s) using egress SVC to reach %u.%u.%u.%u\n",client->dev->name, NIPQUAD(ip));
1089 client->eg_ops->put(eg_entry);
1090 return;
1091 }
1092 }
1093 if (eg_entry != NULL)
1094 client->eg_ops->put(eg_entry);
1095
1096 /* No luck in the egress cache we must open an ingress SVC */
1097 msg->type = OPEN_INGRESS_SVC;
1098 if (qos && (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class))
1099 {
1100 msg->qos = qos->qos;
1101 printk("mpoa: (%s) trying to get a CBR shortcut\n",client->dev->name);
1102 }
1103 else memset(&msg->qos,0,sizeof(struct atm_qos));
1104 msg_to_mpoad(msg, client);
1105 return;
1106 }
1107
MPOA_res_reply_rcvd(struct k_message * msg,struct mpoa_client * mpc)1108 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1109 {
1110 unsigned char *ip;
1111
1112 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1113 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1114 ip = (unsigned char *)&dst_ip;
1115 dprintk("mpoa: (%s) MPOA_res_reply_rcvd: ip %u.%u.%u.%u\n", mpc->dev->name, NIPQUAD(ip));
1116 ddprintk("mpoa: (%s) MPOA_res_reply_rcvd() entry = %p", mpc->dev->name, entry);
1117 if(entry == NULL){
1118 printk("\nmpoa: (%s) ARGH, received res. reply for an entry that doesn't exist.\n", mpc->dev->name);
1119 return;
1120 }
1121 ddprintk(" entry_state = %d ", entry->entry_state);
1122
1123 if (entry->entry_state == INGRESS_RESOLVED) {
1124 printk("\nmpoa: (%s) MPOA_res_reply_rcvd for RESOLVED entry!\n", mpc->dev->name);
1125 mpc->in_ops->put(entry);
1126 return;
1127 }
1128
1129 entry->ctrl_info = msg->content.in_info;
1130 do_gettimeofday(&(entry->tv));
1131 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1132 entry->refresh_time = 0;
1133 ddprintk("entry->shortcut = %p\n", entry->shortcut);
1134
1135 if(entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL){
1136 entry->entry_state = INGRESS_RESOLVED;
1137 mpc->in_ops->put(entry);
1138 return; /* Shortcut already open... */
1139 }
1140
1141 if (entry->shortcut != NULL) {
1142 printk("mpoa: (%s) MPOA_res_reply_rcvd: entry->shortcut != NULL, impossible!\n",
1143 mpc->dev->name);
1144 mpc->in_ops->put(entry);
1145 return;
1146 }
1147
1148 check_qos_and_open_shortcut(msg, mpc, entry);
1149 entry->entry_state = INGRESS_RESOLVED;
1150 mpc->in_ops->put(entry);
1151
1152 return;
1153
1154 }
1155
ingress_purge_rcvd(struct k_message * msg,struct mpoa_client * mpc)1156 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1157 {
1158 uint32_t dst_ip = msg->content.in_info.in_dst_ip;
1159 uint32_t mask = msg->ip_mask;
1160 unsigned char *ip = (unsigned char *)&dst_ip;
1161 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1162
1163 if(entry == NULL){
1164 printk("mpoa: (%s) ingress_purge_rcvd: purge for a non-existing entry, ", mpc->dev->name);
1165 printk("ip = %u.%u.%u.%u\n", ip[0], ip[1], ip[2], ip[3]);
1166 return;
1167 }
1168
1169 do {
1170 dprintk("mpoa: (%s) ingress_purge_rcvd: removing an ingress entry, ip = %u.%u.%u.%u\n" ,
1171 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
1172 write_lock_bh(&mpc->ingress_lock);
1173 mpc->in_ops->remove_entry(entry, mpc);
1174 write_unlock_bh(&mpc->ingress_lock);
1175 mpc->in_ops->put(entry);
1176 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1177 } while (entry != NULL);
1178
1179 return;
1180 }
1181
egress_purge_rcvd(struct k_message * msg,struct mpoa_client * mpc)1182 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1183 {
1184 uint32_t cache_id = msg->content.eg_info.cache_id;
1185 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1186
1187 if (entry == NULL) {
1188 dprintk("mpoa: (%s) egress_purge_rcvd: purge for a non-existing entry\n", mpc->dev->name);
1189 return;
1190 }
1191
1192 write_lock_irq(&mpc->egress_lock);
1193 mpc->eg_ops->remove_entry(entry, mpc);
1194 write_unlock_irq(&mpc->egress_lock);
1195
1196 mpc->eg_ops->put(entry);
1197
1198 return;
1199 }
1200
purge_egress_shortcut(struct atm_vcc * vcc,eg_cache_entry * entry)1201 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
1202 {
1203 struct k_message *purge_msg;
1204 struct sk_buff *skb;
1205
1206 dprintk("mpoa: purge_egress_shortcut: entering\n");
1207 if (vcc == NULL) {
1208 printk("mpoa: purge_egress_shortcut: vcc == NULL\n");
1209 return;
1210 }
1211
1212 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
1213 if (skb == NULL) {
1214 printk("mpoa: purge_egress_shortcut: out of memory\n");
1215 return;
1216 }
1217
1218 skb_put(skb, sizeof(struct k_message));
1219 memset(skb->data, 0, sizeof(struct k_message));
1220 purge_msg = (struct k_message *)skb->data;
1221 purge_msg->type = DATA_PLANE_PURGE;
1222 if (entry != NULL)
1223 purge_msg->content.eg_info = entry->ctrl_info;
1224
1225 atm_force_charge(vcc, skb->truesize);
1226 skb_queue_tail(&vcc->sk->receive_queue, skb);
1227 wake_up(&vcc->sleep);
1228 dprintk("mpoa: purge_egress_shortcut: exiting:\n");
1229
1230 return;
1231 }
1232
1233 /*
1234 * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1235 * of the egress shortcuts we have.
1236 */
mps_death(struct k_message * msg,struct mpoa_client * mpc)1237 static void mps_death( struct k_message * msg, struct mpoa_client * mpc )
1238 {
1239 eg_cache_entry *entry;
1240
1241 dprintk("mpoa: (%s) mps_death:\n", mpc->dev->name);
1242
1243 if(memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)){
1244 printk("mpoa: (%s) mps_death: wrong MPS\n", mpc->dev->name);
1245 return;
1246 }
1247
1248 /* FIXME: This knows too much of the cache structure */
1249 read_lock_irq(&mpc->egress_lock);
1250 entry = mpc->eg_cache;
1251 while (entry != NULL) {
1252 purge_egress_shortcut(entry->shortcut, entry);
1253 entry = entry->next;
1254 }
1255 read_unlock_irq(&mpc->egress_lock);
1256
1257 mpc->in_ops->destroy_cache(mpc);
1258 mpc->eg_ops->destroy_cache(mpc);
1259
1260 return;
1261 }
1262
MPOA_cache_impos_rcvd(struct k_message * msg,struct mpoa_client * mpc)1263 static void MPOA_cache_impos_rcvd( struct k_message * msg, struct mpoa_client * mpc)
1264 {
1265 uint16_t holding_time;
1266 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1267
1268 holding_time = msg->content.eg_info.holding_time;
1269 dprintk("mpoa: (%s) MPOA_cache_impos_rcvd: entry = %p, holding_time = %u\n",
1270 mpc->dev->name, entry, holding_time);
1271 if(entry == NULL && holding_time) {
1272 entry = mpc->eg_ops->add_entry(msg, mpc);
1273 mpc->eg_ops->put(entry);
1274 return;
1275 }
1276 if(holding_time){
1277 mpc->eg_ops->update(entry, holding_time);
1278 return;
1279 }
1280
1281 write_lock_irq(&mpc->egress_lock);
1282 mpc->eg_ops->remove_entry(entry, mpc);
1283 write_unlock_irq(&mpc->egress_lock);
1284
1285 mpc->eg_ops->put(entry);
1286
1287 return;
1288 }
1289
set_mpc_ctrl_addr_rcvd(struct k_message * mesg,struct mpoa_client * mpc)1290 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc)
1291 {
1292 struct lec_priv *priv;
1293 int i, retval ;
1294
1295 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1296
1297 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */
1298 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */
1299 tlv[5] = 0x02; /* MPOA client */
1300 tlv[6] = 0x00; /* number of MPS MAC addresses */
1301
1302 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1303 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1304
1305 dprintk("mpoa: (%s) setting MPC ctrl ATM address to ",
1306 (mpc->dev) ? mpc->dev->name : "<unknown>");
1307 for (i = 7; i < sizeof(tlv); i++)
1308 dprintk("%02x ", tlv[i]);
1309 dprintk("\n");
1310
1311 if (mpc->dev) {
1312 priv = (struct lec_priv *)mpc->dev->priv;
1313 retval = priv->lane2_ops->associate_req(mpc->dev, mpc->dev->dev_addr, tlv, sizeof(tlv));
1314 if (retval == 0)
1315 printk("mpoa: (%s) MPOA device type TLV association failed\n", mpc->dev->name);
1316 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1317 if (retval < 0)
1318 printk("mpoa: (%s) targetless LE_ARP request failed\n", mpc->dev->name);
1319 }
1320
1321 return;
1322 }
1323
set_mps_mac_addr_rcvd(struct k_message * msg,struct mpoa_client * client)1324 static void set_mps_mac_addr_rcvd(struct k_message *msg, struct mpoa_client *client)
1325 {
1326
1327 if(client->number_of_mps_macs)
1328 kfree(client->mps_macs);
1329 client->number_of_mps_macs = 0;
1330 client->mps_macs = kmalloc(ETH_ALEN,GFP_KERNEL);
1331 if (client->mps_macs == NULL) {
1332 printk("mpoa: set_mps_mac_addr_rcvd: out of memory\n");
1333 return;
1334 }
1335 client->number_of_mps_macs = 1;
1336 memcpy(client->mps_macs, msg->MPS_ctrl, ETH_ALEN);
1337
1338 return;
1339 }
1340
1341 /*
1342 * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1343 */
clean_up(struct k_message * msg,struct mpoa_client * mpc,int action)1344 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1345 {
1346
1347 eg_cache_entry *entry;
1348 msg->type = SND_EGRESS_PURGE;
1349
1350
1351 /* FIXME: This knows too much of the cache structure */
1352 read_lock_irq(&mpc->egress_lock);
1353 entry = mpc->eg_cache;
1354 while (entry != NULL){
1355 msg->content.eg_info = entry->ctrl_info;
1356 dprintk("mpoa: cache_id %u\n", entry->ctrl_info.cache_id);
1357 msg_to_mpoad(msg, mpc);
1358 entry = entry->next;
1359 }
1360 read_unlock_irq(&mpc->egress_lock);
1361
1362 msg->type = action;
1363 msg_to_mpoad(msg, mpc);
1364 return;
1365 }
1366
mpc_timer_refresh()1367 static void mpc_timer_refresh()
1368 {
1369 mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1370 mpc_timer.data = mpc_timer.expires;
1371 mpc_timer.function = mpc_cache_check;
1372 add_timer(&mpc_timer);
1373
1374 return;
1375 }
1376
mpc_cache_check(unsigned long checking_time)1377 static void mpc_cache_check( unsigned long checking_time )
1378 {
1379 struct mpoa_client *mpc = mpcs;
1380 static unsigned long previous_resolving_check_time = 0;
1381 static unsigned long previous_refresh_time = 0;
1382
1383 while( mpc != NULL ){
1384 mpc->in_ops->clear_count(mpc);
1385 mpc->eg_ops->clear_expired(mpc);
1386 if(checking_time - previous_resolving_check_time > mpc->parameters.mpc_p4 * HZ ){
1387 mpc->in_ops->check_resolving(mpc);
1388 previous_resolving_check_time = checking_time;
1389 }
1390 if(checking_time - previous_refresh_time > mpc->parameters.mpc_p5 * HZ ){
1391 mpc->in_ops->refresh(mpc);
1392 previous_refresh_time = checking_time;
1393 }
1394 mpc = mpc->next;
1395 }
1396 mpc_timer_refresh();
1397
1398 return;
1399 }
1400
1401 static struct atm_mpoa_ops __atm_mpoa_ops = {
1402 .mpoad_attach = atm_mpoa_mpoad_attach,
1403 .vcc_attach = atm_mpoa_vcc_attach,
1404 .owner = THIS_MODULE
1405 };
1406
atm_mpoa_init(void)1407 static __init int atm_mpoa_init(void)
1408 {
1409 atm_mpoa_ops_set(&__atm_mpoa_ops);
1410
1411 #ifdef CONFIG_PROC_FS
1412 if (mpc_proc_init() != 0)
1413 printk(KERN_INFO "mpoa: failed to initialize /proc/mpoa\n");
1414 else
1415 printk(KERN_INFO "mpoa: /proc/mpoa initialized\n");
1416 #endif
1417
1418 printk("mpc.c: " __DATE__ " " __TIME__ " initialized\n");
1419
1420 return 0;
1421 }
1422
atm_mpoa_cleanup(void)1423 void __exit atm_mpoa_cleanup(void)
1424 {
1425 struct mpoa_client *mpc, *tmp;
1426 struct atm_mpoa_qos *qos, *nextqos;
1427 struct lec_priv *priv;
1428
1429 if (MOD_IN_USE) {
1430 printk("mpc.c: module in use\n");
1431 return;
1432 }
1433 #ifdef CONFIG_PROC_FS
1434 mpc_proc_clean();
1435 #endif
1436
1437 del_timer(&mpc_timer);
1438 unregister_netdevice_notifier(&mpoa_notifier);
1439 atm_mpoa_ops_set(NULL);
1440
1441 mpc = mpcs;
1442 mpcs = NULL;
1443 while (mpc != NULL) {
1444 tmp = mpc->next;
1445 if (mpc->dev != NULL) {
1446 stop_mpc(mpc);
1447 priv = (struct lec_priv *)mpc->dev->priv;
1448 if (priv->lane2_ops != NULL)
1449 priv->lane2_ops->associate_indicator = NULL;
1450 }
1451 ddprintk("mpoa: cleanup_module: about to clear caches\n");
1452 mpc->in_ops->destroy_cache(mpc);
1453 mpc->eg_ops->destroy_cache(mpc);
1454 ddprintk("mpoa: cleanup_module: caches cleared\n");
1455 kfree(mpc->mps_macs);
1456 memset(mpc, 0, sizeof(struct mpoa_client));
1457 ddprintk("mpoa: cleanup_module: about to kfree %p\n", mpc);
1458 kfree(mpc);
1459 ddprintk("mpoa: cleanup_module: next mpc is at %p\n", tmp);
1460 mpc = tmp;
1461 }
1462
1463 qos = qos_head;
1464 qos_head = NULL;
1465 while (qos != NULL) {
1466 nextqos = qos->next;
1467 dprintk("mpoa: cleanup_module: freeing qos entry %p\n", qos);
1468 kfree(qos);
1469 qos = nextqos;
1470 }
1471
1472 return;
1473 }
1474
1475 module_init(atm_mpoa_init);
1476 module_exit(atm_mpoa_cleanup);
1477
1478 MODULE_LICENSE("GPL");
1479