1 #include <linux/kernel.h>
2 #include <linux/string.h>
3 #include <linux/timer.h>
4 #include <linux/init.h>
5 #include <linux/bitops.h>
6 #include <linux/capability.h>
7 #include <linux/seq_file.h>
8
9 /* We are an ethernet device */
10 #include <linux/if_ether.h>
11 #include <linux/netdevice.h>
12 #include <linux/etherdevice.h>
13 #include <net/sock.h>
14 #include <linux/skbuff.h>
15 #include <linux/ip.h>
16 #include <asm/byteorder.h>
17 #include <asm/uaccess.h>
18 #include <net/checksum.h> /* for ip_fast_csum() */
19 #include <net/arp.h>
20 #include <net/dst.h>
21 #include <linux/proc_fs.h>
22
23 /* And atm device */
24 #include <linux/atmdev.h>
25 #include <linux/atmlec.h>
26 #include <linux/atmmpc.h>
27 /* Modular too */
28 #include <linux/module.h>
29
30 #include "lec.h"
31 #include "mpc.h"
32 #include "resources.h"
33
34 /*
35 * mpc.c: Implementation of MPOA client kernel part
36 */
37
38 #if 0
39 #define dprintk printk /* debug */
40 #else
41 #define dprintk(format,args...)
42 #endif
43
44 #if 0
45 #define ddprintk printk /* more debug */
46 #else
47 #define ddprintk(format,args...)
48 #endif
49
50
51
52 #define MPOA_TAG_LEN 4
53
54 /* mpc_daemon -> kernel */
55 static void MPOA_trigger_rcvd (struct k_message *msg, struct mpoa_client *mpc);
56 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
57 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
58 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
59 static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
60 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action);
61 static void MPOA_cache_impos_rcvd(struct k_message *msg, struct mpoa_client *mpc);
62 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
63 static void set_mps_mac_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc);
64
65 static const uint8_t *copy_macs(struct mpoa_client *mpc,
66 const uint8_t *router_mac,
67 const uint8_t *tlvs, uint8_t mps_macs,
68 uint8_t device_type);
69 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
70
71 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc);
72 static void mpoad_close(struct atm_vcc *vcc);
73 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
74
75 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
76 static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev);
77 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev);
78 static void mpc_timer_refresh(void);
79 static void mpc_cache_check( unsigned long checking_time );
80
81 static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
82 0xaa, 0xaa, 0x03,
83 {0x00, 0x00, 0x5e},
84 {0x00, 0x03} /* For MPOA control PDUs */
85 };
86 static struct llc_snap_hdr llc_snap_mpoa_data = {
87 0xaa, 0xaa, 0x03,
88 {0x00, 0x00, 0x00},
89 {0x08, 0x00} /* This is for IP PDUs only */
90 };
91 static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
92 0xaa, 0xaa, 0x03,
93 {0x00, 0x00, 0x00},
94 {0x88, 0x4c} /* This is for tagged data PDUs */
95 };
96
97 static struct notifier_block mpoa_notifier = {
98 mpoa_event_listener,
99 NULL,
100 0
101 };
102
103 struct mpoa_client *mpcs = NULL; /* FIXME */
104 static struct atm_mpoa_qos *qos_head = NULL;
105 static DEFINE_TIMER(mpc_timer, NULL, 0, 0);
106
107
find_mpc_by_itfnum(int itf)108 static struct mpoa_client *find_mpc_by_itfnum(int itf)
109 {
110 struct mpoa_client *mpc;
111
112 mpc = mpcs; /* our global linked list */
113 while (mpc != NULL) {
114 if (mpc->dev_num == itf)
115 return mpc;
116 mpc = mpc->next;
117 }
118
119 return NULL; /* not found */
120 }
121
find_mpc_by_vcc(struct atm_vcc * vcc)122 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
123 {
124 struct mpoa_client *mpc;
125
126 mpc = mpcs; /* our global linked list */
127 while (mpc != NULL) {
128 if (mpc->mpoad_vcc == vcc)
129 return mpc;
130 mpc = mpc->next;
131 }
132
133 return NULL; /* not found */
134 }
135
find_mpc_by_lec(struct net_device * dev)136 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
137 {
138 struct mpoa_client *mpc;
139
140 mpc = mpcs; /* our global linked list */
141 while (mpc != NULL) {
142 if (mpc->dev == dev)
143 return mpc;
144 mpc = mpc->next;
145 }
146
147 return NULL; /* not found */
148 }
149
150 /*
151 * Functions for managing QoS list
152 */
153
154 /*
155 * Overwrites the old entry or makes a new one.
156 */
atm_mpoa_add_qos(__be32 dst_ip,struct atm_qos * qos)157 struct atm_mpoa_qos *atm_mpoa_add_qos(__be32 dst_ip, struct atm_qos *qos)
158 {
159 struct atm_mpoa_qos *entry;
160
161 entry = atm_mpoa_search_qos(dst_ip);
162 if (entry != NULL) {
163 entry->qos = *qos;
164 return entry;
165 }
166
167 entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
168 if (entry == NULL) {
169 printk("mpoa: atm_mpoa_add_qos: out of memory\n");
170 return entry;
171 }
172
173 entry->ipaddr = dst_ip;
174 entry->qos = *qos;
175
176 entry->next = qos_head;
177 qos_head = entry;
178
179 return entry;
180 }
181
atm_mpoa_search_qos(__be32 dst_ip)182 struct atm_mpoa_qos *atm_mpoa_search_qos(__be32 dst_ip)
183 {
184 struct atm_mpoa_qos *qos;
185
186 qos = qos_head;
187 while( qos != NULL ){
188 if(qos->ipaddr == dst_ip) {
189 break;
190 }
191 qos = qos->next;
192 }
193
194 return qos;
195 }
196
197 /*
198 * Returns 0 for failure
199 */
atm_mpoa_delete_qos(struct atm_mpoa_qos * entry)200 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
201 {
202
203 struct atm_mpoa_qos *curr;
204
205 if (entry == NULL) return 0;
206 if (entry == qos_head) {
207 qos_head = qos_head->next;
208 kfree(entry);
209 return 1;
210 }
211
212 curr = qos_head;
213 while (curr != NULL) {
214 if (curr->next == entry) {
215 curr->next = entry->next;
216 kfree(entry);
217 return 1;
218 }
219 curr = curr->next;
220 }
221
222 return 0;
223 }
224
225 /* this is buggered - we need locking for qos_head */
atm_mpoa_disp_qos(struct seq_file * m)226 void atm_mpoa_disp_qos(struct seq_file *m)
227 {
228 struct atm_mpoa_qos *qos;
229
230 qos = qos_head;
231 seq_printf(m, "QoS entries for shortcuts:\n");
232 seq_printf(m, "IP address\n TX:max_pcr pcr min_pcr max_cdv max_sdu\n RX:max_pcr pcr min_pcr max_cdv max_sdu\n");
233
234 while (qos != NULL) {
235 seq_printf(m, "%pI4\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n",
236 &qos->ipaddr,
237 qos->qos.txtp.max_pcr, qos->qos.txtp.pcr, qos->qos.txtp.min_pcr, qos->qos.txtp.max_cdv, qos->qos.txtp.max_sdu,
238 qos->qos.rxtp.max_pcr, qos->qos.rxtp.pcr, qos->qos.rxtp.min_pcr, qos->qos.rxtp.max_cdv, qos->qos.rxtp.max_sdu);
239 qos = qos->next;
240 }
241 }
242
find_lec_by_itfnum(int itf)243 static struct net_device *find_lec_by_itfnum(int itf)
244 {
245 struct net_device *dev;
246 char name[IFNAMSIZ];
247
248 sprintf(name, "lec%d", itf);
249 dev = dev_get_by_name(&init_net, name);
250
251 return dev;
252 }
253
alloc_mpc(void)254 static struct mpoa_client *alloc_mpc(void)
255 {
256 struct mpoa_client *mpc;
257
258 mpc = kzalloc(sizeof (struct mpoa_client), GFP_KERNEL);
259 if (mpc == NULL)
260 return NULL;
261 rwlock_init(&mpc->ingress_lock);
262 rwlock_init(&mpc->egress_lock);
263 mpc->next = mpcs;
264 atm_mpoa_init_cache(mpc);
265
266 mpc->parameters.mpc_p1 = MPC_P1;
267 mpc->parameters.mpc_p2 = MPC_P2;
268 memset(mpc->parameters.mpc_p3,0,sizeof(mpc->parameters.mpc_p3));
269 mpc->parameters.mpc_p4 = MPC_P4;
270 mpc->parameters.mpc_p5 = MPC_P5;
271 mpc->parameters.mpc_p6 = MPC_P6;
272
273 mpcs = mpc;
274
275 return mpc;
276 }
277
278 /*
279 *
280 * start_mpc() puts the MPC on line. All the packets destined
281 * to the lec underneath us are now being monitored and
282 * shortcuts will be established.
283 *
284 */
start_mpc(struct mpoa_client * mpc,struct net_device * dev)285 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
286 {
287
288 dprintk("mpoa: (%s) start_mpc:\n", mpc->dev->name);
289 if (dev->hard_start_xmit == NULL) {
290 printk("mpoa: (%s) start_mpc: dev->hard_start_xmit == NULL, not starting\n",
291 dev->name);
292 return;
293 }
294 mpc->old_hard_start_xmit = dev->hard_start_xmit;
295 dev->hard_start_xmit = mpc_send_packet;
296
297 return;
298 }
299
stop_mpc(struct mpoa_client * mpc)300 static void stop_mpc(struct mpoa_client *mpc)
301 {
302
303 dprintk("mpoa: (%s) stop_mpc:", mpc->dev->name);
304
305 /* Lets not nullify lec device's dev->hard_start_xmit */
306 if (mpc->dev->hard_start_xmit != mpc_send_packet) {
307 dprintk(" mpc already stopped, not fatal\n");
308 return;
309 }
310 dprintk("\n");
311 mpc->dev->hard_start_xmit = mpc->old_hard_start_xmit;
312 mpc->old_hard_start_xmit = NULL;
313 /* close_shortcuts(mpc); ??? FIXME */
314
315 return;
316 }
317
318 static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
319
mpoa_device_type_string(char type)320 static const char *mpoa_device_type_string(char type)
321 {
322 switch(type) {
323 case NON_MPOA:
324 return "non-MPOA device";
325 break;
326 case MPS:
327 return "MPS";
328 break;
329 case MPC:
330 return "MPC";
331 break;
332 case MPS_AND_MPC:
333 return "both MPS and MPC";
334 break;
335 default:
336 return "unspecified (non-MPOA) device";
337 break;
338 }
339
340 return ""; /* not reached */
341 }
342
343 /*
344 * lec device calls this via its netdev_priv(dev)->lane2_ops
345 * ->associate_indicator() when it sees a TLV in LE_ARP packet.
346 * We fill in the pointer above when we see a LANE2 lec initializing
347 * See LANE2 spec 3.1.5
348 *
349 * Quite a big and ugly function but when you look at it
350 * all it does is to try to locate and parse MPOA Device
351 * Type TLV.
352 * We give our lec a pointer to this function and when the
353 * lec sees a TLV it uses the pointer to call this function.
354 *
355 */
lane2_assoc_ind(struct net_device * dev,const u8 * mac_addr,const u8 * tlvs,u32 sizeoftlvs)356 static void lane2_assoc_ind(struct net_device *dev, const u8 *mac_addr,
357 const u8 *tlvs, u32 sizeoftlvs)
358 {
359 uint32_t type;
360 uint8_t length, mpoa_device_type, number_of_mps_macs;
361 const uint8_t *end_of_tlvs;
362 struct mpoa_client *mpc;
363
364 mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
365 dprintk("mpoa: (%s) lane2_assoc_ind: received TLV(s), ", dev->name);
366 dprintk("total length of all TLVs %d\n", sizeoftlvs);
367 mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
368 if (mpc == NULL) {
369 printk("mpoa: (%s) lane2_assoc_ind: no mpc\n", dev->name);
370 return;
371 }
372 end_of_tlvs = tlvs + sizeoftlvs;
373 while (end_of_tlvs - tlvs >= 5) {
374 type = (tlvs[0] << 24) | (tlvs[1] << 16) | (tlvs[2] << 8) | tlvs[3];
375 length = tlvs[4];
376 tlvs += 5;
377 dprintk(" type 0x%x length %02x\n", type, length);
378 if (tlvs + length > end_of_tlvs) {
379 printk("TLV value extends past its buffer, aborting parse\n");
380 return;
381 }
382
383 if (type == 0) {
384 printk("mpoa: (%s) lane2_assoc_ind: TLV type was 0, returning\n", dev->name);
385 return;
386 }
387
388 if (type != TLV_MPOA_DEVICE_TYPE) {
389 tlvs += length;
390 continue; /* skip other TLVs */
391 }
392 mpoa_device_type = *tlvs++;
393 number_of_mps_macs = *tlvs++;
394 dprintk("mpoa: (%s) MPOA device type '%s', ", dev->name, mpoa_device_type_string(mpoa_device_type));
395 if (mpoa_device_type == MPS_AND_MPC &&
396 length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
397 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
398 dev->name);
399 continue;
400 }
401 if ((mpoa_device_type == MPS || mpoa_device_type == MPC)
402 && length < 22 + number_of_mps_macs*ETH_ALEN) {
403 printk("\nmpoa: (%s) lane2_assoc_ind: short MPOA Device Type TLV\n",
404 dev->name);
405 continue;
406 }
407 if (mpoa_device_type != MPS && mpoa_device_type != MPS_AND_MPC) {
408 dprintk("ignoring non-MPS device\n");
409 if (mpoa_device_type == MPC) tlvs += 20;
410 continue; /* we are only interested in MPSs */
411 }
412 if (number_of_mps_macs == 0 && mpoa_device_type == MPS_AND_MPC) {
413 printk("\nmpoa: (%s) lane2_assoc_ind: MPS_AND_MPC has zero MACs\n", dev->name);
414 continue; /* someone should read the spec */
415 }
416 dprintk("this MPS has %d MAC addresses\n", number_of_mps_macs);
417
418 /* ok, now we can go and tell our daemon the control address of MPS */
419 send_set_mps_ctrl_addr(tlvs, mpc);
420
421 tlvs = copy_macs(mpc, mac_addr, tlvs, number_of_mps_macs, mpoa_device_type);
422 if (tlvs == NULL) return;
423 }
424 if (end_of_tlvs - tlvs != 0)
425 printk("mpoa: (%s) lane2_assoc_ind: ignoring %Zd bytes of trailing TLV carbage\n",
426 dev->name, end_of_tlvs - tlvs);
427 return;
428 }
429
430 /*
431 * Store at least advertizing router's MAC address
432 * plus the possible MAC address(es) to mpc->mps_macs.
433 * For a freshly allocated MPOA client mpc->mps_macs == 0.
434 */
copy_macs(struct mpoa_client * mpc,const uint8_t * router_mac,const uint8_t * tlvs,uint8_t mps_macs,uint8_t device_type)435 static const uint8_t *copy_macs(struct mpoa_client *mpc,
436 const uint8_t *router_mac,
437 const uint8_t *tlvs, uint8_t mps_macs,
438 uint8_t device_type)
439 {
440 int num_macs;
441 num_macs = (mps_macs > 1) ? mps_macs : 1;
442
443 if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
444 if (mpc->number_of_mps_macs != 0) kfree(mpc->mps_macs);
445 mpc->number_of_mps_macs = 0;
446 mpc->mps_macs = kmalloc(num_macs*ETH_ALEN, GFP_KERNEL);
447 if (mpc->mps_macs == NULL) {
448 printk("mpoa: (%s) copy_macs: out of mem\n", mpc->dev->name);
449 return NULL;
450 }
451 }
452 memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
453 tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
454 if (mps_macs > 0)
455 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
456 tlvs += mps_macs*ETH_ALEN;
457 mpc->number_of_mps_macs = num_macs;
458
459 return tlvs;
460 }
461
send_via_shortcut(struct sk_buff * skb,struct mpoa_client * mpc)462 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
463 {
464 in_cache_entry *entry;
465 struct iphdr *iph;
466 char *buff;
467 __be32 ipaddr = 0;
468
469 static struct {
470 struct llc_snap_hdr hdr;
471 __be32 tag;
472 } tagged_llc_snap_hdr = {
473 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
474 0
475 };
476
477 buff = skb->data + mpc->dev->hard_header_len;
478 iph = (struct iphdr *)buff;
479 ipaddr = iph->daddr;
480
481 ddprintk("mpoa: (%s) send_via_shortcut: ipaddr 0x%x\n", mpc->dev->name, ipaddr);
482
483 entry = mpc->in_ops->get(ipaddr, mpc);
484 if (entry == NULL) {
485 entry = mpc->in_ops->add_entry(ipaddr, mpc);
486 if (entry != NULL) mpc->in_ops->put(entry);
487 return 1;
488 }
489 if (mpc->in_ops->cache_hit(entry, mpc) != OPEN){ /* threshold not exceeded or VCC not ready */
490 ddprintk("mpoa: (%s) send_via_shortcut: cache_hit: returns != OPEN\n", mpc->dev->name);
491 mpc->in_ops->put(entry);
492 return 1;
493 }
494
495 ddprintk("mpoa: (%s) send_via_shortcut: using shortcut\n", mpc->dev->name);
496 /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
497 if (iph->ttl <= 1) {
498 ddprintk("mpoa: (%s) send_via_shortcut: IP ttl = %u, using LANE\n", mpc->dev->name, iph->ttl);
499 mpc->in_ops->put(entry);
500 return 1;
501 }
502 iph->ttl--;
503 iph->check = 0;
504 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
505
506 if (entry->ctrl_info.tag != 0) {
507 ddprintk("mpoa: (%s) send_via_shortcut: adding tag 0x%x\n", mpc->dev->name, entry->ctrl_info.tag);
508 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
509 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
510 skb_push(skb, sizeof(tagged_llc_snap_hdr)); /* add LLC/SNAP header */
511 skb_copy_to_linear_data(skb, &tagged_llc_snap_hdr,
512 sizeof(tagged_llc_snap_hdr));
513 } else {
514 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
515 skb_push(skb, sizeof(struct llc_snap_hdr)); /* add LLC/SNAP header + tag */
516 skb_copy_to_linear_data(skb, &llc_snap_mpoa_data,
517 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 */
mpc_send_packet(struct sk_buff * skb,struct net_device * dev)532 static 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 /* Weed out funny packets (e.g., AF_PACKET or raw). */
550 if (skb->len < ETH_HLEN + sizeof(struct iphdr))
551 goto non_ip;
552 skb_set_network_header(skb, ETH_HLEN);
553 if (skb->len < ETH_HLEN + ip_hdr(skb)->ihl * 4 || ip_hdr(skb)->ihl < 5)
554 goto non_ip;
555
556 while (i < mpc->number_of_mps_macs) {
557 if (!compare_ether_addr(eth->h_dest, (mpc->mps_macs + i*ETH_ALEN)))
558 if ( send_via_shortcut(skb, mpc) == 0 ) /* try shortcut */
559 return 0; /* success! */
560 i++;
561 }
562
563 non_ip:
564 retval = mpc->old_hard_start_xmit(skb,dev);
565
566 return retval;
567 }
568
atm_mpoa_vcc_attach(struct atm_vcc * vcc,void __user * arg)569 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
570 {
571 int bytes_left;
572 struct mpoa_client *mpc;
573 struct atmmpc_ioc ioc_data;
574 in_cache_entry *in_entry;
575 __be32 ipaddr;
576
577 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
578 if (bytes_left != 0) {
579 printk("mpoa: mpc_vcc_attach: Short read (missed %d bytes) from userland\n", bytes_left);
580 return -EFAULT;
581 }
582 ipaddr = ioc_data.ipaddr;
583 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
584 return -EINVAL;
585
586 mpc = find_mpc_by_itfnum(ioc_data.dev_num);
587 if (mpc == NULL)
588 return -EINVAL;
589
590 if (ioc_data.type == MPC_SOCKET_INGRESS) {
591 in_entry = mpc->in_ops->get(ipaddr, mpc);
592 if (in_entry == NULL || in_entry->entry_state < INGRESS_RESOLVED) {
593 printk("mpoa: (%s) mpc_vcc_attach: did not find RESOLVED entry from ingress cache\n",
594 mpc->dev->name);
595 if (in_entry != NULL) mpc->in_ops->put(in_entry);
596 return -EINVAL;
597 }
598 printk("mpoa: (%s) mpc_vcc_attach: attaching ingress SVC, entry = %pI4\n",
599 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
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 dprintk("mpoa: (%s) mpc_vcc_close: ingress SVC closed ip = %pI4\n",
631 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
632 in_entry->shortcut = NULL;
633 mpc->in_ops->put(in_entry);
634 }
635 eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
636 if (eg_entry) {
637 dprintk("mpoa: (%s) mpc_vcc_close: egress SVC closed\n", mpc->dev->name);
638 eg_entry->shortcut = NULL;
639 mpc->eg_ops->put(eg_entry);
640 }
641
642 if (in_entry == NULL && eg_entry == NULL)
643 dprintk("mpoa: (%s) mpc_vcc_close: unused vcc closed\n", dev->name);
644
645 return;
646 }
647
mpc_push(struct atm_vcc * vcc,struct sk_buff * skb)648 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
649 {
650 struct net_device *dev = (struct net_device *)vcc->proto_data;
651 struct sk_buff *new_skb;
652 eg_cache_entry *eg;
653 struct mpoa_client *mpc;
654 __be32 tag;
655 char *tmp;
656
657 ddprintk("mpoa: (%s) mpc_push:\n", dev->name);
658 if (skb == NULL) {
659 dprintk("mpoa: (%s) mpc_push: null skb, closing VCC\n", dev->name);
660 mpc_vcc_close(vcc, dev);
661 return;
662 }
663
664 skb->dev = dev;
665 if (memcmp(skb->data, &llc_snap_mpoa_ctrl, sizeof(struct llc_snap_hdr)) == 0) {
666 struct sock *sk = sk_atm(vcc);
667
668 dprintk("mpoa: (%s) mpc_push: control packet arrived\n", dev->name);
669 /* Pass control packets to daemon */
670 skb_queue_tail(&sk->sk_receive_queue, skb);
671 sk->sk_data_ready(sk, skb->len);
672 return;
673 }
674
675 /* data coming over the shortcut */
676 atm_return(vcc, skb->truesize);
677
678 mpc = find_mpc_by_lec(dev);
679 if (mpc == NULL) {
680 printk("mpoa: (%s) mpc_push: unknown MPC\n", dev->name);
681 return;
682 }
683
684 if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
685 ddprintk("mpoa: (%s) mpc_push: tagged data packet arrived\n", dev->name);
686
687 } else if (memcmp(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
688 printk("mpoa: (%s) mpc_push: non-tagged data packet arrived\n", dev->name);
689 printk(" mpc_push: non-tagged data unsupported, purging\n");
690 dev_kfree_skb_any(skb);
691 return;
692 } else {
693 printk("mpoa: (%s) mpc_push: garbage arrived, purging\n", dev->name);
694 dev_kfree_skb_any(skb);
695 return;
696 }
697
698 tmp = skb->data + sizeof(struct llc_snap_hdr);
699 tag = *(__be32 *)tmp;
700
701 eg = mpc->eg_ops->get_by_tag(tag, mpc);
702 if (eg == NULL) {
703 printk("mpoa: (%s) mpc_push: Didn't find egress cache entry, tag = %u\n",
704 dev->name,tag);
705 purge_egress_shortcut(vcc, NULL);
706 dev_kfree_skb_any(skb);
707 return;
708 }
709
710 /*
711 * See if ingress MPC is using shortcut we opened as a return channel.
712 * This means we have a bi-directional vcc opened by us.
713 */
714 if (eg->shortcut == NULL) {
715 eg->shortcut = vcc;
716 printk("mpoa: (%s) mpc_push: egress SVC in use\n", dev->name);
717 }
718
719 skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); /* get rid of LLC/SNAP header */
720 new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); /* LLC/SNAP is shorter than MAC header :( */
721 dev_kfree_skb_any(skb);
722 if (new_skb == NULL){
723 mpc->eg_ops->put(eg);
724 return;
725 }
726 skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */
727 skb_copy_to_linear_data(new_skb, eg->ctrl_info.DLL_header,
728 eg->ctrl_info.DH_length);
729 new_skb->protocol = eth_type_trans(new_skb, dev);
730 skb_reset_network_header(new_skb);
731
732 eg->latest_ip_addr = ip_hdr(new_skb)->saddr;
733 eg->packets_rcvd++;
734 mpc->eg_ops->put(eg);
735
736 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
737 netif_rx(new_skb);
738
739 return;
740 }
741
742 static struct atmdev_ops mpc_ops = { /* only send is required */
743 .close = mpoad_close,
744 .send = msg_from_mpoad
745 };
746
747 static struct atm_dev mpc_dev = {
748 .ops = &mpc_ops,
749 .type = "mpc",
750 .number = 42,
751 .lock = __SPIN_LOCK_UNLOCKED(mpc_dev.lock)
752 /* members not explicitly initialised will be 0 */
753 };
754
atm_mpoa_mpoad_attach(struct atm_vcc * vcc,int arg)755 static int atm_mpoa_mpoad_attach (struct atm_vcc *vcc, int arg)
756 {
757 struct mpoa_client *mpc;
758 struct lec_priv *priv;
759 int err;
760
761 if (mpcs == NULL) {
762 init_timer(&mpc_timer);
763 mpc_timer_refresh();
764
765 /* This lets us now how our LECs are doing */
766 err = register_netdevice_notifier(&mpoa_notifier);
767 if (err < 0) {
768 del_timer(&mpc_timer);
769 return err;
770 }
771 }
772
773 mpc = find_mpc_by_itfnum(arg);
774 if (mpc == NULL) {
775 dprintk("mpoa: mpoad_attach: allocating new mpc for itf %d\n", arg);
776 mpc = alloc_mpc();
777 if (mpc == NULL)
778 return -ENOMEM;
779 mpc->dev_num = arg;
780 mpc->dev = find_lec_by_itfnum(arg); /* NULL if there was no lec */
781 }
782 if (mpc->mpoad_vcc) {
783 printk("mpoa: mpoad_attach: mpoad is already present for itf %d\n", arg);
784 return -EADDRINUSE;
785 }
786
787 if (mpc->dev) { /* check if the lec is LANE2 capable */
788 priv = netdev_priv(mpc->dev);
789 if (priv->lane_version < 2) {
790 dev_put(mpc->dev);
791 mpc->dev = NULL;
792 } else
793 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
794 }
795
796 mpc->mpoad_vcc = vcc;
797 vcc->dev = &mpc_dev;
798 vcc_insert_socket(sk_atm(vcc));
799 set_bit(ATM_VF_META,&vcc->flags);
800 set_bit(ATM_VF_READY,&vcc->flags);
801
802 if (mpc->dev) {
803 char empty[ATM_ESA_LEN];
804 memset(empty, 0, ATM_ESA_LEN);
805
806 start_mpc(mpc, mpc->dev);
807 /* set address if mpcd e.g. gets killed and restarted.
808 * If we do not do it now we have to wait for the next LE_ARP
809 */
810 if ( memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0 )
811 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
812 }
813
814 __module_get(THIS_MODULE);
815 return arg;
816 }
817
send_set_mps_ctrl_addr(const char * addr,struct mpoa_client * mpc)818 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc)
819 {
820 struct k_message mesg;
821
822 memcpy (mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
823
824 mesg.type = SET_MPS_CTRL_ADDR;
825 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
826 msg_to_mpoad(&mesg, mpc);
827
828 return;
829 }
830
mpoad_close(struct atm_vcc * vcc)831 static void mpoad_close(struct atm_vcc *vcc)
832 {
833 struct mpoa_client *mpc;
834 struct sk_buff *skb;
835
836 mpc = find_mpc_by_vcc(vcc);
837 if (mpc == NULL) {
838 printk("mpoa: mpoad_close: did not find MPC\n");
839 return;
840 }
841 if (!mpc->mpoad_vcc) {
842 printk("mpoa: mpoad_close: close for non-present mpoad\n");
843 return;
844 }
845
846 mpc->mpoad_vcc = NULL;
847 if (mpc->dev) {
848 struct lec_priv *priv = netdev_priv(mpc->dev);
849 priv->lane2_ops->associate_indicator = NULL;
850 stop_mpc(mpc);
851 dev_put(mpc->dev);
852 }
853
854 mpc->in_ops->destroy_cache(mpc);
855 mpc->eg_ops->destroy_cache(mpc);
856
857 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
858 atm_return(vcc, skb->truesize);
859 kfree_skb(skb);
860 }
861
862 printk("mpoa: (%s) going down\n",
863 (mpc->dev) ? mpc->dev->name : "<unknown>");
864 module_put(THIS_MODULE);
865
866 return;
867 }
868
869 /*
870 *
871 */
msg_from_mpoad(struct atm_vcc * vcc,struct sk_buff * skb)872 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
873 {
874
875 struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
876 struct k_message *mesg = (struct k_message*)skb->data;
877 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
878
879 if (mpc == NULL) {
880 printk("mpoa: msg_from_mpoad: no mpc found\n");
881 return 0;
882 }
883 dprintk("mpoa: (%s) msg_from_mpoad:", (mpc->dev) ? mpc->dev->name : "<unknown>");
884 switch(mesg->type) {
885 case MPOA_RES_REPLY_RCVD:
886 dprintk(" mpoa_res_reply_rcvd\n");
887 MPOA_res_reply_rcvd(mesg, mpc);
888 break;
889 case MPOA_TRIGGER_RCVD:
890 dprintk(" mpoa_trigger_rcvd\n");
891 MPOA_trigger_rcvd(mesg, mpc);
892 break;
893 case INGRESS_PURGE_RCVD:
894 dprintk(" nhrp_purge_rcvd\n");
895 ingress_purge_rcvd(mesg, mpc);
896 break;
897 case EGRESS_PURGE_RCVD:
898 dprintk(" egress_purge_reply_rcvd\n");
899 egress_purge_rcvd(mesg, mpc);
900 break;
901 case MPS_DEATH:
902 dprintk(" mps_death\n");
903 mps_death(mesg, mpc);
904 break;
905 case CACHE_IMPOS_RCVD:
906 dprintk(" cache_impos_rcvd\n");
907 MPOA_cache_impos_rcvd(mesg, mpc);
908 break;
909 case SET_MPC_CTRL_ADDR:
910 dprintk(" set_mpc_ctrl_addr\n");
911 set_mpc_ctrl_addr_rcvd(mesg, mpc);
912 break;
913 case SET_MPS_MAC_ADDR:
914 dprintk(" set_mps_mac_addr\n");
915 set_mps_mac_addr_rcvd(mesg, mpc);
916 break;
917 case CLEAN_UP_AND_EXIT:
918 dprintk(" clean_up_and_exit\n");
919 clean_up(mesg, mpc, DIE);
920 break;
921 case RELOAD:
922 dprintk(" reload\n");
923 clean_up(mesg, mpc, RELOAD);
924 break;
925 case SET_MPC_PARAMS:
926 dprintk(" set_mpc_params\n");
927 mpc->parameters = mesg->content.params;
928 break;
929 default:
930 dprintk(" unknown message %d\n", mesg->type);
931 break;
932 }
933 kfree_skb(skb);
934
935 return 0;
936 }
937
938 /* Remember that this function may not do things that sleep */
msg_to_mpoad(struct k_message * mesg,struct mpoa_client * mpc)939 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
940 {
941 struct sk_buff *skb;
942 struct sock *sk;
943
944 if (mpc == NULL || !mpc->mpoad_vcc) {
945 printk("mpoa: msg_to_mpoad: mesg %d to a non-existent mpoad\n", mesg->type);
946 return -ENXIO;
947 }
948
949 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
950 if (skb == NULL)
951 return -ENOMEM;
952 skb_put(skb, sizeof(struct k_message));
953 skb_copy_to_linear_data(skb, mesg, sizeof(*mesg));
954 atm_force_charge(mpc->mpoad_vcc, skb->truesize);
955
956 sk = sk_atm(mpc->mpoad_vcc);
957 skb_queue_tail(&sk->sk_receive_queue, skb);
958 sk->sk_data_ready(sk, skb->len);
959
960 return 0;
961 }
962
mpoa_event_listener(struct notifier_block * mpoa_notifier,unsigned long event,void * dev_ptr)963 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev_ptr)
964 {
965 struct net_device *dev;
966 struct mpoa_client *mpc;
967 struct lec_priv *priv;
968
969 dev = (struct net_device *)dev_ptr;
970
971 if (!net_eq(dev_net(dev), &init_net))
972 return NOTIFY_DONE;
973
974 if (dev->name == NULL || strncmp(dev->name, "lec", 3))
975 return NOTIFY_DONE; /* we are only interested in lec:s */
976
977 switch (event) {
978 case NETDEV_REGISTER: /* a new lec device was allocated */
979 priv = netdev_priv(dev);
980 if (priv->lane_version < 2)
981 break;
982 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
983 mpc = find_mpc_by_itfnum(priv->itfnum);
984 if (mpc == NULL) {
985 dprintk("mpoa: mpoa_event_listener: allocating new mpc for %s\n",
986 dev->name);
987 mpc = alloc_mpc();
988 if (mpc == NULL) {
989 printk("mpoa: mpoa_event_listener: no new mpc");
990 break;
991 }
992 }
993 mpc->dev_num = priv->itfnum;
994 mpc->dev = dev;
995 dev_hold(dev);
996 dprintk("mpoa: (%s) was initialized\n", dev->name);
997 break;
998 case NETDEV_UNREGISTER:
999 /* the lec device was deallocated */
1000 mpc = find_mpc_by_lec(dev);
1001 if (mpc == NULL)
1002 break;
1003 dprintk("mpoa: device (%s) was deallocated\n", dev->name);
1004 stop_mpc(mpc);
1005 dev_put(mpc->dev);
1006 mpc->dev = NULL;
1007 break;
1008 case NETDEV_UP:
1009 /* the dev was ifconfig'ed up */
1010 mpc = find_mpc_by_lec(dev);
1011 if (mpc == NULL)
1012 break;
1013 if (mpc->mpoad_vcc != NULL) {
1014 start_mpc(mpc, dev);
1015 }
1016 break;
1017 case NETDEV_DOWN:
1018 /* the dev was ifconfig'ed down */
1019 /* this means that the flow of packets from the
1020 * upper layer stops
1021 */
1022 mpc = find_mpc_by_lec(dev);
1023 if (mpc == NULL)
1024 break;
1025 if (mpc->mpoad_vcc != NULL) {
1026 stop_mpc(mpc);
1027 }
1028 break;
1029 case NETDEV_REBOOT:
1030 case NETDEV_CHANGE:
1031 case NETDEV_CHANGEMTU:
1032 case NETDEV_CHANGEADDR:
1033 case NETDEV_GOING_DOWN:
1034 break;
1035 default:
1036 break;
1037 }
1038
1039 return NOTIFY_DONE;
1040 }
1041
1042 /*
1043 * Functions which are called after a message is received from mpcd.
1044 * Msg is reused on purpose.
1045 */
1046
1047
MPOA_trigger_rcvd(struct k_message * msg,struct mpoa_client * mpc)1048 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1049 {
1050 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1051 in_cache_entry *entry;
1052
1053 entry = mpc->in_ops->get(dst_ip, mpc);
1054 if(entry == NULL){
1055 entry = mpc->in_ops->add_entry(dst_ip, mpc);
1056 entry->entry_state = INGRESS_RESOLVING;
1057 msg->type = SND_MPOA_RES_RQST;
1058 msg->content.in_info = entry->ctrl_info;
1059 msg_to_mpoad(msg, mpc);
1060 do_gettimeofday(&(entry->reply_wait));
1061 mpc->in_ops->put(entry);
1062 return;
1063 }
1064
1065 if(entry->entry_state == INGRESS_INVALID){
1066 entry->entry_state = INGRESS_RESOLVING;
1067 msg->type = SND_MPOA_RES_RQST;
1068 msg->content.in_info = entry->ctrl_info;
1069 msg_to_mpoad(msg, mpc);
1070 do_gettimeofday(&(entry->reply_wait));
1071 mpc->in_ops->put(entry);
1072 return;
1073 }
1074
1075 printk("mpoa: (%s) MPOA_trigger_rcvd: entry already in resolving state\n",
1076 (mpc->dev) ? mpc->dev->name : "<unknown>");
1077 mpc->in_ops->put(entry);
1078 return;
1079 }
1080
1081 /*
1082 * Things get complicated because we have to check if there's an egress
1083 * shortcut with suitable traffic parameters we could use.
1084 */
check_qos_and_open_shortcut(struct k_message * msg,struct mpoa_client * client,in_cache_entry * entry)1085 static void check_qos_and_open_shortcut(struct k_message *msg, struct mpoa_client *client, in_cache_entry *entry)
1086 {
1087 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1088 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1089 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1090
1091 if(eg_entry && eg_entry->shortcut){
1092 if(eg_entry->shortcut->qos.txtp.traffic_class &
1093 msg->qos.txtp.traffic_class &
1094 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)){
1095 if(eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1096 entry->shortcut = eg_entry->shortcut;
1097 else if(eg_entry->shortcut->qos.txtp.max_pcr > 0)
1098 entry->shortcut = eg_entry->shortcut;
1099 }
1100 if(entry->shortcut){
1101 dprintk("mpoa: (%s) using egress SVC to reach %pI4\n",
1102 client->dev->name, &dst_ip);
1103 client->eg_ops->put(eg_entry);
1104 return;
1105 }
1106 }
1107 if (eg_entry != NULL)
1108 client->eg_ops->put(eg_entry);
1109
1110 /* No luck in the egress cache we must open an ingress SVC */
1111 msg->type = OPEN_INGRESS_SVC;
1112 if (qos && (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class))
1113 {
1114 msg->qos = qos->qos;
1115 printk("mpoa: (%s) trying to get a CBR shortcut\n",client->dev->name);
1116 }
1117 else memset(&msg->qos,0,sizeof(struct atm_qos));
1118 msg_to_mpoad(msg, client);
1119 return;
1120 }
1121
MPOA_res_reply_rcvd(struct k_message * msg,struct mpoa_client * mpc)1122 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1123 {
1124 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1125 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1126
1127 dprintk("mpoa: (%s) MPOA_res_reply_rcvd: ip %pI4\n",
1128 mpc->dev->name, &dst_ip);
1129 ddprintk("mpoa: (%s) MPOA_res_reply_rcvd() entry = %p", mpc->dev->name, entry);
1130 if(entry == NULL){
1131 printk("\nmpoa: (%s) ARGH, received res. reply for an entry that doesn't exist.\n", mpc->dev->name);
1132 return;
1133 }
1134 ddprintk(" entry_state = %d ", entry->entry_state);
1135
1136 if (entry->entry_state == INGRESS_RESOLVED) {
1137 printk("\nmpoa: (%s) MPOA_res_reply_rcvd for RESOLVED entry!\n", mpc->dev->name);
1138 mpc->in_ops->put(entry);
1139 return;
1140 }
1141
1142 entry->ctrl_info = msg->content.in_info;
1143 do_gettimeofday(&(entry->tv));
1144 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1145 entry->refresh_time = 0;
1146 ddprintk("entry->shortcut = %p\n", entry->shortcut);
1147
1148 if(entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL){
1149 entry->entry_state = INGRESS_RESOLVED;
1150 mpc->in_ops->put(entry);
1151 return; /* Shortcut already open... */
1152 }
1153
1154 if (entry->shortcut != NULL) {
1155 printk("mpoa: (%s) MPOA_res_reply_rcvd: entry->shortcut != NULL, impossible!\n",
1156 mpc->dev->name);
1157 mpc->in_ops->put(entry);
1158 return;
1159 }
1160
1161 check_qos_and_open_shortcut(msg, mpc, entry);
1162 entry->entry_state = INGRESS_RESOLVED;
1163 mpc->in_ops->put(entry);
1164
1165 return;
1166
1167 }
1168
ingress_purge_rcvd(struct k_message * msg,struct mpoa_client * mpc)1169 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1170 {
1171 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1172 __be32 mask = msg->ip_mask;
1173 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1174
1175 if(entry == NULL){
1176 printk("mpoa: (%s) ingress_purge_rcvd: purge for a non-existing entry, ip = %pI4\n",
1177 mpc->dev->name, &dst_ip);
1178 return;
1179 }
1180
1181 do {
1182 dprintk("mpoa: (%s) ingress_purge_rcvd: removing an ingress entry, ip = %pI4\n",
1183 mpc->dev->name, &dst_ip);
1184 write_lock_bh(&mpc->ingress_lock);
1185 mpc->in_ops->remove_entry(entry, mpc);
1186 write_unlock_bh(&mpc->ingress_lock);
1187 mpc->in_ops->put(entry);
1188 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1189 } while (entry != NULL);
1190
1191 return;
1192 }
1193
egress_purge_rcvd(struct k_message * msg,struct mpoa_client * mpc)1194 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1195 {
1196 __be32 cache_id = msg->content.eg_info.cache_id;
1197 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1198
1199 if (entry == NULL) {
1200 dprintk("mpoa: (%s) egress_purge_rcvd: purge for a non-existing entry\n", mpc->dev->name);
1201 return;
1202 }
1203
1204 write_lock_irq(&mpc->egress_lock);
1205 mpc->eg_ops->remove_entry(entry, mpc);
1206 write_unlock_irq(&mpc->egress_lock);
1207
1208 mpc->eg_ops->put(entry);
1209
1210 return;
1211 }
1212
purge_egress_shortcut(struct atm_vcc * vcc,eg_cache_entry * entry)1213 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
1214 {
1215 struct sock *sk;
1216 struct k_message *purge_msg;
1217 struct sk_buff *skb;
1218
1219 dprintk("mpoa: purge_egress_shortcut: entering\n");
1220 if (vcc == NULL) {
1221 printk("mpoa: purge_egress_shortcut: vcc == NULL\n");
1222 return;
1223 }
1224
1225 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
1226 if (skb == NULL) {
1227 printk("mpoa: purge_egress_shortcut: out of memory\n");
1228 return;
1229 }
1230
1231 skb_put(skb, sizeof(struct k_message));
1232 memset(skb->data, 0, sizeof(struct k_message));
1233 purge_msg = (struct k_message *)skb->data;
1234 purge_msg->type = DATA_PLANE_PURGE;
1235 if (entry != NULL)
1236 purge_msg->content.eg_info = entry->ctrl_info;
1237
1238 atm_force_charge(vcc, skb->truesize);
1239
1240 sk = sk_atm(vcc);
1241 skb_queue_tail(&sk->sk_receive_queue, skb);
1242 sk->sk_data_ready(sk, skb->len);
1243 dprintk("mpoa: purge_egress_shortcut: exiting:\n");
1244
1245 return;
1246 }
1247
1248 /*
1249 * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1250 * of the egress shortcuts we have.
1251 */
mps_death(struct k_message * msg,struct mpoa_client * mpc)1252 static void mps_death( struct k_message * msg, struct mpoa_client * mpc )
1253 {
1254 eg_cache_entry *entry;
1255
1256 dprintk("mpoa: (%s) mps_death:\n", mpc->dev->name);
1257
1258 if(memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)){
1259 printk("mpoa: (%s) mps_death: wrong MPS\n", mpc->dev->name);
1260 return;
1261 }
1262
1263 /* FIXME: This knows too much of the cache structure */
1264 read_lock_irq(&mpc->egress_lock);
1265 entry = mpc->eg_cache;
1266 while (entry != NULL) {
1267 purge_egress_shortcut(entry->shortcut, entry);
1268 entry = entry->next;
1269 }
1270 read_unlock_irq(&mpc->egress_lock);
1271
1272 mpc->in_ops->destroy_cache(mpc);
1273 mpc->eg_ops->destroy_cache(mpc);
1274
1275 return;
1276 }
1277
MPOA_cache_impos_rcvd(struct k_message * msg,struct mpoa_client * mpc)1278 static void MPOA_cache_impos_rcvd( struct k_message * msg, struct mpoa_client * mpc)
1279 {
1280 uint16_t holding_time;
1281 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1282
1283 holding_time = msg->content.eg_info.holding_time;
1284 dprintk("mpoa: (%s) MPOA_cache_impos_rcvd: entry = %p, holding_time = %u\n",
1285 mpc->dev->name, entry, holding_time);
1286 if(entry == NULL && holding_time) {
1287 entry = mpc->eg_ops->add_entry(msg, mpc);
1288 mpc->eg_ops->put(entry);
1289 return;
1290 }
1291 if(holding_time){
1292 mpc->eg_ops->update(entry, holding_time);
1293 return;
1294 }
1295
1296 write_lock_irq(&mpc->egress_lock);
1297 mpc->eg_ops->remove_entry(entry, mpc);
1298 write_unlock_irq(&mpc->egress_lock);
1299
1300 mpc->eg_ops->put(entry);
1301
1302 return;
1303 }
1304
set_mpc_ctrl_addr_rcvd(struct k_message * mesg,struct mpoa_client * mpc)1305 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc)
1306 {
1307 struct lec_priv *priv;
1308 int i, retval ;
1309
1310 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1311
1312 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */
1313 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */
1314 tlv[5] = 0x02; /* MPOA client */
1315 tlv[6] = 0x00; /* number of MPS MAC addresses */
1316
1317 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1318 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1319
1320 dprintk("mpoa: (%s) setting MPC ctrl ATM address to ",
1321 (mpc->dev) ? mpc->dev->name : "<unknown>");
1322 for (i = 7; i < sizeof(tlv); i++)
1323 dprintk("%02x ", tlv[i]);
1324 dprintk("\n");
1325
1326 if (mpc->dev) {
1327 priv = netdev_priv(mpc->dev);
1328 retval = priv->lane2_ops->associate_req(mpc->dev, mpc->dev->dev_addr, tlv, sizeof(tlv));
1329 if (retval == 0)
1330 printk("mpoa: (%s) MPOA device type TLV association failed\n", mpc->dev->name);
1331 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1332 if (retval < 0)
1333 printk("mpoa: (%s) targetless LE_ARP request failed\n", mpc->dev->name);
1334 }
1335
1336 return;
1337 }
1338
set_mps_mac_addr_rcvd(struct k_message * msg,struct mpoa_client * client)1339 static void set_mps_mac_addr_rcvd(struct k_message *msg, struct mpoa_client *client)
1340 {
1341
1342 if(client->number_of_mps_macs)
1343 kfree(client->mps_macs);
1344 client->number_of_mps_macs = 0;
1345 client->mps_macs = kmemdup(msg->MPS_ctrl, ETH_ALEN, GFP_KERNEL);
1346 if (client->mps_macs == NULL) {
1347 printk("mpoa: set_mps_mac_addr_rcvd: out of memory\n");
1348 return;
1349 }
1350 client->number_of_mps_macs = 1;
1351
1352 return;
1353 }
1354
1355 /*
1356 * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1357 */
clean_up(struct k_message * msg,struct mpoa_client * mpc,int action)1358 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1359 {
1360
1361 eg_cache_entry *entry;
1362 msg->type = SND_EGRESS_PURGE;
1363
1364
1365 /* FIXME: This knows too much of the cache structure */
1366 read_lock_irq(&mpc->egress_lock);
1367 entry = mpc->eg_cache;
1368 while (entry != NULL){
1369 msg->content.eg_info = entry->ctrl_info;
1370 dprintk("mpoa: cache_id %u\n", entry->ctrl_info.cache_id);
1371 msg_to_mpoad(msg, mpc);
1372 entry = entry->next;
1373 }
1374 read_unlock_irq(&mpc->egress_lock);
1375
1376 msg->type = action;
1377 msg_to_mpoad(msg, mpc);
1378 return;
1379 }
1380
mpc_timer_refresh(void)1381 static void mpc_timer_refresh(void)
1382 {
1383 mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1384 mpc_timer.data = mpc_timer.expires;
1385 mpc_timer.function = mpc_cache_check;
1386 add_timer(&mpc_timer);
1387
1388 return;
1389 }
1390
mpc_cache_check(unsigned long checking_time)1391 static void mpc_cache_check( unsigned long checking_time )
1392 {
1393 struct mpoa_client *mpc = mpcs;
1394 static unsigned long previous_resolving_check_time;
1395 static unsigned long previous_refresh_time;
1396
1397 while( mpc != NULL ){
1398 mpc->in_ops->clear_count(mpc);
1399 mpc->eg_ops->clear_expired(mpc);
1400 if(checking_time - previous_resolving_check_time > mpc->parameters.mpc_p4 * HZ ){
1401 mpc->in_ops->check_resolving(mpc);
1402 previous_resolving_check_time = checking_time;
1403 }
1404 if(checking_time - previous_refresh_time > mpc->parameters.mpc_p5 * HZ ){
1405 mpc->in_ops->refresh(mpc);
1406 previous_refresh_time = checking_time;
1407 }
1408 mpc = mpc->next;
1409 }
1410 mpc_timer_refresh();
1411
1412 return;
1413 }
1414
atm_mpoa_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1415 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1416 {
1417 int err = 0;
1418 struct atm_vcc *vcc = ATM_SD(sock);
1419
1420 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1421 return -ENOIOCTLCMD;
1422
1423 if (!capable(CAP_NET_ADMIN))
1424 return -EPERM;
1425
1426 switch (cmd) {
1427 case ATMMPC_CTRL:
1428 err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1429 if (err >= 0)
1430 sock->state = SS_CONNECTED;
1431 break;
1432 case ATMMPC_DATA:
1433 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1434 break;
1435 default:
1436 break;
1437 }
1438 return err;
1439 }
1440
1441
1442 static struct atm_ioctl atm_ioctl_ops = {
1443 .owner = THIS_MODULE,
1444 .ioctl = atm_mpoa_ioctl,
1445 };
1446
atm_mpoa_init(void)1447 static __init int atm_mpoa_init(void)
1448 {
1449 register_atm_ioctl(&atm_ioctl_ops);
1450
1451 if (mpc_proc_init() != 0)
1452 printk(KERN_INFO "mpoa: failed to initialize /proc/mpoa\n");
1453
1454 printk("mpc.c: " __DATE__ " " __TIME__ " initialized\n");
1455
1456 return 0;
1457 }
1458
atm_mpoa_cleanup(void)1459 static void __exit atm_mpoa_cleanup(void)
1460 {
1461 struct mpoa_client *mpc, *tmp;
1462 struct atm_mpoa_qos *qos, *nextqos;
1463 struct lec_priv *priv;
1464
1465 mpc_proc_clean();
1466
1467 del_timer(&mpc_timer);
1468 unregister_netdevice_notifier(&mpoa_notifier);
1469 deregister_atm_ioctl(&atm_ioctl_ops);
1470
1471 mpc = mpcs;
1472 mpcs = NULL;
1473 while (mpc != NULL) {
1474 tmp = mpc->next;
1475 if (mpc->dev != NULL) {
1476 stop_mpc(mpc);
1477 priv = netdev_priv(mpc->dev);
1478 if (priv->lane2_ops != NULL)
1479 priv->lane2_ops->associate_indicator = NULL;
1480 }
1481 ddprintk("mpoa: cleanup_module: about to clear caches\n");
1482 mpc->in_ops->destroy_cache(mpc);
1483 mpc->eg_ops->destroy_cache(mpc);
1484 ddprintk("mpoa: cleanup_module: caches cleared\n");
1485 kfree(mpc->mps_macs);
1486 memset(mpc, 0, sizeof(struct mpoa_client));
1487 ddprintk("mpoa: cleanup_module: about to kfree %p\n", mpc);
1488 kfree(mpc);
1489 ddprintk("mpoa: cleanup_module: next mpc is at %p\n", tmp);
1490 mpc = tmp;
1491 }
1492
1493 qos = qos_head;
1494 qos_head = NULL;
1495 while (qos != NULL) {
1496 nextqos = qos->next;
1497 dprintk("mpoa: cleanup_module: freeing qos entry %p\n", qos);
1498 kfree(qos);
1499 qos = nextqos;
1500 }
1501
1502 return;
1503 }
1504
1505 module_init(atm_mpoa_init);
1506 module_exit(atm_mpoa_cleanup);
1507
1508 MODULE_LICENSE("GPL");
1509