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ksm: fix NULL pointer dereference in scan_get_next_rmap_item()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / atm / mpc.c
blob644cdf07164211b007d10e40918486497efe93c5
1 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
2
3 #include <linux/kernel.h>
4 #include <linux/string.h>
5 #include <linux/slab.h>
6 #include <linux/timer.h>
7 #include <linux/init.h>
8 #include <linux/bitops.h>
9 #include <linux/capability.h>
10 #include <linux/seq_file.h>
11
12 /* We are an ethernet device */
13 #include <linux/if_ether.h>
14 #include <linux/netdevice.h>
15 #include <linux/etherdevice.h>
16 #include <net/sock.h>
17 #include <linux/skbuff.h>
18 #include <linux/ip.h>
19 #include <linux/uaccess.h>
20 #include <asm/byteorder.h>
21 #include <net/checksum.h> /* for ip_fast_csum() */
22 #include <net/arp.h>
23 #include <net/dst.h>
24 #include <linux/proc_fs.h>
25
26 /* And atm device */
27 #include <linux/atmdev.h>
28 #include <linux/atmlec.h>
29 #include <linux/atmmpc.h>
30 /* Modular too */
31 #include <linux/module.h>
32
33 #include "lec.h"
34 #include "mpc.h"
35 #include "resources.h"
36
37 /*
38 * mpc.c: Implementation of MPOA client kernel part
39 */
40
41 #if 0
42 #define dprintk(format, args...) \
43 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args)
44 #define dprintk_cont(format, args...) printk(KERN_CONT format, ##args)
45 #else
46 #define dprintk(format, args...) \
47 do { if (0) \
48 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\
49 } while (0)
50 #define dprintk_cont(format, args...) \
51 do { if (0) printk(KERN_CONT format, ##args); } while (0)
52 #endif
53
54 #if 0
55 #define ddprintk(format, args...) \
56 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args)
57 #define ddprintk_cont(format, args...) printk(KERN_CONT format, ##args)
58 #else
59 #define ddprintk(format, args...) \
60 do { if (0) \
61 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\
62 } while (0)
63 #define ddprintk_cont(format, args...) \
64 do { if (0) printk(KERN_CONT format, ##args); } while (0)
65 #endif
66
67 /* mpc_daemon -> kernel */
68 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc);
69 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
70 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
71 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
72 static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
73 static void clean_up(struct k_message *msg, struct mpoa_client *mpc,
74 int action);
75 static void MPOA_cache_impos_rcvd(struct k_message *msg,
76 struct mpoa_client *mpc);
77 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg,
78 struct mpoa_client *mpc);
79 static void set_mps_mac_addr_rcvd(struct k_message *mesg,
80 struct mpoa_client *mpc);
81
82 static const uint8_t *copy_macs(struct mpoa_client *mpc,
83 const uint8_t *router_mac,
84 const uint8_t *tlvs, uint8_t mps_macs,
85 uint8_t device_type);
86 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
87
88 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc);
89 static void mpoad_close(struct atm_vcc *vcc);
90 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
91
92 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
93 static netdev_tx_t mpc_send_packet(struct sk_buff *skb,
94 struct net_device *dev);
95 static int mpoa_event_listener(struct notifier_block *mpoa_notifier,
96 unsigned long event, void *dev);
97 static void mpc_timer_refresh(void);
98 static void mpc_cache_check(unsigned long checking_time);
99
100 static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
101 0xaa, 0xaa, 0x03,
102 {0x00, 0x00, 0x5e},
103 {0x00, 0x03} /* For MPOA control PDUs */
104 };
105 static struct llc_snap_hdr llc_snap_mpoa_data = {
106 0xaa, 0xaa, 0x03,
107 {0x00, 0x00, 0x00},
108 {0x08, 0x00} /* This is for IP PDUs only */
109 };
110 static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
111 0xaa, 0xaa, 0x03,
112 {0x00, 0x00, 0x00},
113 {0x88, 0x4c} /* This is for tagged data PDUs */
114 };
115
116 static struct notifier_block mpoa_notifier = {
117 mpoa_event_listener,
118 NULL,
119 0
120 };
121
122 struct mpoa_client *mpcs = NULL; /* FIXME */
123 static struct atm_mpoa_qos *qos_head = NULL;
124 static DEFINE_TIMER(mpc_timer, NULL, 0, 0);
125
126
127 static struct mpoa_client *find_mpc_by_itfnum(int itf)
128 {
129 struct mpoa_client *mpc;
130
131 mpc = mpcs; /* our global linked list */
132 while (mpc != NULL) {
133 if (mpc->dev_num == itf)
134 return mpc;
135 mpc = mpc->next;
136 }
137
138 return NULL; /* not found */
139 }
140
141 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
142 {
143 struct mpoa_client *mpc;
144
145 mpc = mpcs; /* our global linked list */
146 while (mpc != NULL) {
147 if (mpc->mpoad_vcc == vcc)
148 return mpc;
149 mpc = mpc->next;
150 }
151
152 return NULL; /* not found */
153 }
154
155 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
156 {
157 struct mpoa_client *mpc;
158
159 mpc = mpcs; /* our global linked list */
160 while (mpc != NULL) {
161 if (mpc->dev == dev)
162 return mpc;
163 mpc = mpc->next;
164 }
165
166 return NULL; /* not found */
167 }
168
169 /*
170 * Functions for managing QoS list
171 */
172
173 /*
174 * Overwrites the old entry or makes a new one.
175 */
176 struct atm_mpoa_qos *atm_mpoa_add_qos(__be32 dst_ip, struct atm_qos *qos)
177 {
178 struct atm_mpoa_qos *entry;
179
180 entry = atm_mpoa_search_qos(dst_ip);
181 if (entry != NULL) {
182 entry->qos = *qos;
183 return entry;
184 }
185
186 entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
187 if (entry == NULL) {
188 pr_info("mpoa: out of memory\n");
189 return entry;
190 }
191
192 entry->ipaddr = dst_ip;
193 entry->qos = *qos;
194
195 entry->next = qos_head;
196 qos_head = entry;
197
198 return entry;
199 }
200
201 struct atm_mpoa_qos *atm_mpoa_search_qos(__be32 dst_ip)
202 {
203 struct atm_mpoa_qos *qos;
204
205 qos = qos_head;
206 while (qos) {
207 if (qos->ipaddr == dst_ip)
208 break;
209 qos = qos->next;
210 }
211
212 return qos;
213 }
214
215 /*
216 * Returns 0 for failure
217 */
218 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
219 {
220 struct atm_mpoa_qos *curr;
221
222 if (entry == NULL)
223 return 0;
224 if (entry == qos_head) {
225 qos_head = qos_head->next;
226 kfree(entry);
227 return 1;
228 }
229
230 curr = qos_head;
231 while (curr != NULL) {
232 if (curr->next == entry) {
233 curr->next = entry->next;
234 kfree(entry);
235 return 1;
236 }
237 curr = curr->next;
238 }
239
240 return 0;
241 }
242
243 /* this is buggered - we need locking for qos_head */
244 void atm_mpoa_disp_qos(struct seq_file *m)
245 {
246 struct atm_mpoa_qos *qos;
247
248 qos = qos_head;
249 seq_printf(m, "QoS entries for shortcuts:\n");
250 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");
251
252 while (qos != NULL) {
253 seq_printf(m, "%pI4\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n",
254 &qos->ipaddr,
255 qos->qos.txtp.max_pcr,
256 qos->qos.txtp.pcr,
257 qos->qos.txtp.min_pcr,
258 qos->qos.txtp.max_cdv,
259 qos->qos.txtp.max_sdu,
260 qos->qos.rxtp.max_pcr,
261 qos->qos.rxtp.pcr,
262 qos->qos.rxtp.min_pcr,
263 qos->qos.rxtp.max_cdv,
264 qos->qos.rxtp.max_sdu);
265 qos = qos->next;
266 }
267 }
268
269 static struct net_device *find_lec_by_itfnum(int itf)
270 {
271 struct net_device *dev;
272 char name[IFNAMSIZ];
273
274 sprintf(name, "lec%d", itf);
275 dev = dev_get_by_name(&init_net, name);
276
277 return dev;
278 }
279
280 static struct mpoa_client *alloc_mpc(void)
281 {
282 struct mpoa_client *mpc;
283
284 mpc = kzalloc(sizeof(struct mpoa_client), GFP_KERNEL);
285 if (mpc == NULL)
286 return NULL;
287 rwlock_init(&mpc->ingress_lock);
288 rwlock_init(&mpc->egress_lock);
289 mpc->next = mpcs;
290 atm_mpoa_init_cache(mpc);
291
292 mpc->parameters.mpc_p1 = MPC_P1;
293 mpc->parameters.mpc_p2 = MPC_P2;
294 memset(mpc->parameters.mpc_p3, 0, sizeof(mpc->parameters.mpc_p3));
295 mpc->parameters.mpc_p4 = MPC_P4;
296 mpc->parameters.mpc_p5 = MPC_P5;
297 mpc->parameters.mpc_p6 = MPC_P6;
298
299 mpcs = mpc;
300
301 return mpc;
302 }
303
304 /*
305 *
306 * start_mpc() puts the MPC on line. All the packets destined
307 * to the lec underneath us are now being monitored and
308 * shortcuts will be established.
309 *
310 */
311 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
312 {
313
314 dprintk("(%s)\n", mpc->dev->name);
315 if (!dev->netdev_ops)
316 pr_info("(%s) not starting\n", dev->name);
317 else {
318 mpc->old_ops = dev->netdev_ops;
319 mpc->new_ops = *mpc->old_ops;
320 mpc->new_ops.ndo_start_xmit = mpc_send_packet;
321 dev->netdev_ops = &mpc->new_ops;
322 }
323 }
324
325 static void stop_mpc(struct mpoa_client *mpc)
326 {
327 struct net_device *dev = mpc->dev;
328 dprintk("(%s)", mpc->dev->name);
329
330 /* Lets not nullify lec device's dev->hard_start_xmit */
331 if (dev->netdev_ops != &mpc->new_ops) {
332 dprintk_cont(" mpc already stopped, not fatal\n");
333 return;
334 }
335 dprintk_cont("\n");
336
337 dev->netdev_ops = mpc->old_ops;
338 mpc->old_ops = NULL;
339
340 /* close_shortcuts(mpc); ??? FIXME */
341 }
342
343 static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
344
345 static const char *mpoa_device_type_string(char type)
346 {
347 switch (type) {
348 case NON_MPOA:
349 return "non-MPOA device";
350 case MPS:
351 return "MPS";
352 case MPC:
353 return "MPC";
354 case MPS_AND_MPC:
355 return "both MPS and MPC";
356 }
357
358 return "unspecified (non-MPOA) device";
359 }
360
361 /*
362 * lec device calls this via its netdev_priv(dev)->lane2_ops
363 * ->associate_indicator() when it sees a TLV in LE_ARP packet.
364 * We fill in the pointer above when we see a LANE2 lec initializing
365 * See LANE2 spec 3.1.5
366 *
367 * Quite a big and ugly function but when you look at it
368 * all it does is to try to locate and parse MPOA Device
369 * Type TLV.
370 * We give our lec a pointer to this function and when the
371 * lec sees a TLV it uses the pointer to call this function.
372 *
373 */
374 static void lane2_assoc_ind(struct net_device *dev, const u8 *mac_addr,
375 const u8 *tlvs, u32 sizeoftlvs)
376 {
377 uint32_t type;
378 uint8_t length, mpoa_device_type, number_of_mps_macs;
379 const uint8_t *end_of_tlvs;
380 struct mpoa_client *mpc;
381
382 mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
383 dprintk("(%s) received TLV(s), ", dev->name);
384 dprintk("total length of all TLVs %d\n", sizeoftlvs);
385 mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
386 if (mpc == NULL) {
387 pr_info("(%s) no mpc\n", dev->name);
388 return;
389 }
390 end_of_tlvs = tlvs + sizeoftlvs;
391 while (end_of_tlvs - tlvs >= 5) {
392 type = ((tlvs[0] << 24) | (tlvs[1] << 16) |
393 (tlvs[2] << 8) | tlvs[3]);
394 length = tlvs[4];
395 tlvs += 5;
396 dprintk(" type 0x%x length %02x\n", type, length);
397 if (tlvs + length > end_of_tlvs) {
398 pr_info("TLV value extends past its buffer, aborting parse\n");
399 return;
400 }
401
402 if (type == 0) {
403 pr_info("mpoa: (%s) TLV type was 0, returning\n",
404 dev->name);
405 return;
406 }
407
408 if (type != TLV_MPOA_DEVICE_TYPE) {
409 tlvs += length;
410 continue; /* skip other TLVs */
411 }
412 mpoa_device_type = *tlvs++;
413 number_of_mps_macs = *tlvs++;
414 dprintk("(%s) MPOA device type '%s', ",
415 dev->name, mpoa_device_type_string(mpoa_device_type));
416 if (mpoa_device_type == MPS_AND_MPC &&
417 length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
418 pr_info("(%s) short MPOA Device Type TLV\n",
419 dev->name);
420 continue;
421 }
422 if ((mpoa_device_type == MPS || mpoa_device_type == MPC) &&
423 length < 22 + number_of_mps_macs*ETH_ALEN) {
424 pr_info("(%s) short MPOA Device Type TLV\n", dev->name);
425 continue;
426 }
427 if (mpoa_device_type != MPS &&
428 mpoa_device_type != MPS_AND_MPC) {
429 dprintk("ignoring non-MPS device ");
430 if (mpoa_device_type == MPC)
431 tlvs += 20;
432 continue; /* we are only interested in MPSs */
433 }
434 if (number_of_mps_macs == 0 &&
435 mpoa_device_type == MPS_AND_MPC) {
436 pr_info("(%s) MPS_AND_MPC has zero MACs\n", dev->name);
437 continue; /* someone should read the spec */
438 }
439 dprintk_cont("this MPS has %d MAC addresses\n",
440 number_of_mps_macs);
441
442 /*
443 * ok, now we can go and tell our daemon
444 * the control address of MPS
445 */
446 send_set_mps_ctrl_addr(tlvs, mpc);
447
448 tlvs = copy_macs(mpc, mac_addr, tlvs,
449 number_of_mps_macs, mpoa_device_type);
450 if (tlvs == NULL)
451 return;
452 }
453 if (end_of_tlvs - tlvs != 0)
454 pr_info("(%s) ignoring %Zd bytes of trailing TLV garbage\n",
455 dev->name, end_of_tlvs - tlvs);
456 }
457
458 /*
459 * Store at least advertizing router's MAC address
460 * plus the possible MAC address(es) to mpc->mps_macs.
461 * For a freshly allocated MPOA client mpc->mps_macs == 0.
462 */
463 static const uint8_t *copy_macs(struct mpoa_client *mpc,
464 const uint8_t *router_mac,
465 const uint8_t *tlvs, uint8_t mps_macs,
466 uint8_t device_type)
467 {
468 int num_macs;
469 num_macs = (mps_macs > 1) ? mps_macs : 1;
470
471 if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
472 if (mpc->number_of_mps_macs != 0)
473 kfree(mpc->mps_macs);
474 mpc->number_of_mps_macs = 0;
475 mpc->mps_macs = kmalloc(num_macs * ETH_ALEN, GFP_KERNEL);
476 if (mpc->mps_macs == NULL) {
477 pr_info("(%s) out of mem\n", mpc->dev->name);
478 return NULL;
479 }
480 }
481 memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
482 tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
483 if (mps_macs > 0)
484 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
485 tlvs += mps_macs*ETH_ALEN;
486 mpc->number_of_mps_macs = num_macs;
487
488 return tlvs;
489 }
490
491 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
492 {
493 in_cache_entry *entry;
494 struct iphdr *iph;
495 char *buff;
496 __be32 ipaddr = 0;
497
498 static struct {
499 struct llc_snap_hdr hdr;
500 __be32 tag;
501 } tagged_llc_snap_hdr = {
502 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
503 0
504 };
505
506 buff = skb->data + mpc->dev->hard_header_len;
507 iph = (struct iphdr *)buff;
508 ipaddr = iph->daddr;
509
510 ddprintk("(%s) ipaddr 0x%x\n",
511 mpc->dev->name, ipaddr);
512
513 entry = mpc->in_ops->get(ipaddr, mpc);
514 if (entry == NULL) {
515 entry = mpc->in_ops->add_entry(ipaddr, mpc);
516 if (entry != NULL)
517 mpc->in_ops->put(entry);
518 return 1;
519 }
520 /* threshold not exceeded or VCC not ready */
521 if (mpc->in_ops->cache_hit(entry, mpc) != OPEN) {
522 ddprintk("(%s) cache_hit: returns != OPEN\n",
523 mpc->dev->name);
524 mpc->in_ops->put(entry);
525 return 1;
526 }
527
528 ddprintk("(%s) using shortcut\n",
529 mpc->dev->name);
530 /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
531 if (iph->ttl <= 1) {
532 ddprintk("(%s) IP ttl = %u, using LANE\n",
533 mpc->dev->name, iph->ttl);
534 mpc->in_ops->put(entry);
535 return 1;
536 }
537 iph->ttl--;
538 iph->check = 0;
539 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
540
541 if (entry->ctrl_info.tag != 0) {
542 ddprintk("(%s) adding tag 0x%x\n",
543 mpc->dev->name, entry->ctrl_info.tag);
544 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
545 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
546 skb_push(skb, sizeof(tagged_llc_snap_hdr));
547 /* add LLC/SNAP header */
548 skb_copy_to_linear_data(skb, &tagged_llc_snap_hdr,
549 sizeof(tagged_llc_snap_hdr));
550 } else {
551 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */
552 skb_push(skb, sizeof(struct llc_snap_hdr));
553 /* add LLC/SNAP header + tag */
554 skb_copy_to_linear_data(skb, &llc_snap_mpoa_data,
555 sizeof(struct llc_snap_hdr));
556 }
557
558 atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
559 ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
560 entry->shortcut->send(entry->shortcut, skb);
561 entry->packets_fwded++;
562 mpc->in_ops->put(entry);
563
564 return 0;
565 }
566
567 /*
568 * Probably needs some error checks and locking, not sure...
569 */
570 static netdev_tx_t mpc_send_packet(struct sk_buff *skb,
571 struct net_device *dev)
572 {
573 struct mpoa_client *mpc;
574 struct ethhdr *eth;
575 int i = 0;
576
577 mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
578 if (mpc == NULL) {
579 pr_info("(%s) no MPC found\n", dev->name);
580 goto non_ip;
581 }
582
583 eth = (struct ethhdr *)skb->data;
584 if (eth->h_proto != htons(ETH_P_IP))
585 goto non_ip; /* Multi-Protocol Over ATM :-) */
586
587 /* Weed out funny packets (e.g., AF_PACKET or raw). */
588 if (skb->len < ETH_HLEN + sizeof(struct iphdr))
589 goto non_ip;
590 skb_set_network_header(skb, ETH_HLEN);
591 if (skb->len < ETH_HLEN + ip_hdr(skb)->ihl * 4 || ip_hdr(skb)->ihl < 5)
592 goto non_ip;
593
594 while (i < mpc->number_of_mps_macs) {
595 if (!compare_ether_addr(eth->h_dest,
596 (mpc->mps_macs + i*ETH_ALEN)))
597 if (send_via_shortcut(skb, mpc) == 0) /* try shortcut */
598 return NETDEV_TX_OK;
599 i++;
600 }
601
602 non_ip:
603 return mpc->old_ops->ndo_start_xmit(skb, dev);
604 }
605
606 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
607 {
608 int bytes_left;
609 struct mpoa_client *mpc;
610 struct atmmpc_ioc ioc_data;
611 in_cache_entry *in_entry;
612 __be32 ipaddr;
613
614 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
615 if (bytes_left != 0) {
616 pr_info("mpoa:Short read (missed %d bytes) from userland\n",
617 bytes_left);
618 return -EFAULT;
619 }
620 ipaddr = ioc_data.ipaddr;
621 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
622 return -EINVAL;
623
624 mpc = find_mpc_by_itfnum(ioc_data.dev_num);
625 if (mpc == NULL)
626 return -EINVAL;
627
628 if (ioc_data.type == MPC_SOCKET_INGRESS) {
629 in_entry = mpc->in_ops->get(ipaddr, mpc);
630 if (in_entry == NULL ||
631 in_entry->entry_state < INGRESS_RESOLVED) {
632 pr_info("(%s) did not find RESOLVED entry from ingress cache\n",
633 mpc->dev->name);
634 if (in_entry != NULL)
635 mpc->in_ops->put(in_entry);
636 return -EINVAL;
637 }
638 pr_info("(%s) attaching ingress SVC, entry = %pI4\n",
639 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
640 in_entry->shortcut = vcc;
641 mpc->in_ops->put(in_entry);
642 } else {
643 pr_info("(%s) attaching egress SVC\n", mpc->dev->name);
644 }
645
646 vcc->proto_data = mpc->dev;
647 vcc->push = mpc_push;
648
649 return 0;
650 }
651
652 /*
653 *
654 */
655 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
656 {
657 struct mpoa_client *mpc;
658 in_cache_entry *in_entry;
659 eg_cache_entry *eg_entry;
660
661 mpc = find_mpc_by_lec(dev);
662 if (mpc == NULL) {
663 pr_info("(%s) close for unknown MPC\n", dev->name);
664 return;
665 }
666
667 dprintk("(%s)\n", dev->name);
668 in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
669 if (in_entry) {
670 dprintk("(%s) ingress SVC closed ip = %pI4\n",
671 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
672 in_entry->shortcut = NULL;
673 mpc->in_ops->put(in_entry);
674 }
675 eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
676 if (eg_entry) {
677 dprintk("(%s) egress SVC closed\n", mpc->dev->name);
678 eg_entry->shortcut = NULL;
679 mpc->eg_ops->put(eg_entry);
680 }
681
682 if (in_entry == NULL && eg_entry == NULL)
683 dprintk("(%s) unused vcc closed\n", dev->name);
684 }
685
686 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
687 {
688 struct net_device *dev = (struct net_device *)vcc->proto_data;
689 struct sk_buff *new_skb;
690 eg_cache_entry *eg;
691 struct mpoa_client *mpc;
692 __be32 tag;
693 char *tmp;
694
695 ddprintk("(%s)\n", dev->name);
696 if (skb == NULL) {
697 dprintk("(%s) null skb, closing VCC\n", dev->name);
698 mpc_vcc_close(vcc, dev);
699 return;
700 }
701
702 skb->dev = dev;
703 if (memcmp(skb->data, &llc_snap_mpoa_ctrl,
704 sizeof(struct llc_snap_hdr)) == 0) {
705 struct sock *sk = sk_atm(vcc);
706
707 dprintk("(%s) control packet arrived\n", dev->name);
708 /* Pass control packets to daemon */
709 skb_queue_tail(&sk->sk_receive_queue, skb);
710 sk->sk_data_ready(sk, skb->len);
711 return;
712 }
713
714 /* data coming over the shortcut */
715 atm_return(vcc, skb->truesize);
716
717 mpc = find_mpc_by_lec(dev);
718 if (mpc == NULL) {
719 pr_info("(%s) unknown MPC\n", dev->name);
720 return;
721 }
722
723 if (memcmp(skb->data, &llc_snap_mpoa_data_tagged,
724 sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
725 ddprintk("(%s) tagged data packet arrived\n", dev->name);
726
727 } else if (memcmp(skb->data, &llc_snap_mpoa_data,
728 sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
729 pr_info("(%s) Unsupported non-tagged data packet arrived. Purging\n",
730 dev->name);
731 dev_kfree_skb_any(skb);
732 return;
733 } else {
734 pr_info("(%s) garbage arrived, purging\n", dev->name);
735 dev_kfree_skb_any(skb);
736 return;
737 }
738
739 tmp = skb->data + sizeof(struct llc_snap_hdr);
740 tag = *(__be32 *)tmp;
741
742 eg = mpc->eg_ops->get_by_tag(tag, mpc);
743 if (eg == NULL) {
744 pr_info("mpoa: (%s) Didn't find egress cache entry, tag = %u\n",
745 dev->name, tag);
746 purge_egress_shortcut(vcc, NULL);
747 dev_kfree_skb_any(skb);
748 return;
749 }
750
751 /*
752 * See if ingress MPC is using shortcut we opened as a return channel.
753 * This means we have a bi-directional vcc opened by us.
754 */
755 if (eg->shortcut == NULL) {
756 eg->shortcut = vcc;
757 pr_info("(%s) egress SVC in use\n", dev->name);
758 }
759
760 skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag));
761 /* get rid of LLC/SNAP header */
762 new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length);
763 /* LLC/SNAP is shorter than MAC header :( */
764 dev_kfree_skb_any(skb);
765 if (new_skb == NULL) {
766 mpc->eg_ops->put(eg);
767 return;
768 }
769 skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */
770 skb_copy_to_linear_data(new_skb, eg->ctrl_info.DLL_header,
771 eg->ctrl_info.DH_length);
772 new_skb->protocol = eth_type_trans(new_skb, dev);
773 skb_reset_network_header(new_skb);
774
775 eg->latest_ip_addr = ip_hdr(new_skb)->saddr;
776 eg->packets_rcvd++;
777 mpc->eg_ops->put(eg);
778
779 memset(ATM_SKB(new_skb), 0, sizeof(struct atm_skb_data));
780 netif_rx(new_skb);
781 }
782
783 static struct atmdev_ops mpc_ops = { /* only send is required */
784 .close = mpoad_close,
785 .send = msg_from_mpoad
786 };
787
788 static struct atm_dev mpc_dev = {
789 .ops = &mpc_ops,
790 .type = "mpc",
791 .number = 42,
792 .lock = __SPIN_LOCK_UNLOCKED(mpc_dev.lock)
793 /* members not explicitly initialised will be 0 */
794 };
795
796 static int atm_mpoa_mpoad_attach(struct atm_vcc *vcc, int arg)
797 {
798 struct mpoa_client *mpc;
799 struct lec_priv *priv;
800 int err;
801
802 if (mpcs == NULL) {
803 init_timer(&mpc_timer);
804 mpc_timer_refresh();
805
806 /* This lets us now how our LECs are doing */
807 err = register_netdevice_notifier(&mpoa_notifier);
808 if (err < 0) {
809 del_timer(&mpc_timer);
810 return err;
811 }
812 }
813
814 mpc = find_mpc_by_itfnum(arg);
815 if (mpc == NULL) {
816 dprintk("allocating new mpc for itf %d\n", arg);
817 mpc = alloc_mpc();
818 if (mpc == NULL)
819 return -ENOMEM;
820 mpc->dev_num = arg;
821 mpc->dev = find_lec_by_itfnum(arg);
822 /* NULL if there was no lec */
823 }
824 if (mpc->mpoad_vcc) {
825 pr_info("mpoad is already present for itf %d\n", arg);
826 return -EADDRINUSE;
827 }
828
829 if (mpc->dev) { /* check if the lec is LANE2 capable */
830 priv = netdev_priv(mpc->dev);
831 if (priv->lane_version < 2) {
832 dev_put(mpc->dev);
833 mpc->dev = NULL;
834 } else
835 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
836 }
837
838 mpc->mpoad_vcc = vcc;
839 vcc->dev = &mpc_dev;
840 vcc_insert_socket(sk_atm(vcc));
841 set_bit(ATM_VF_META, &vcc->flags);
842 set_bit(ATM_VF_READY, &vcc->flags);
843
844 if (mpc->dev) {
845 char empty[ATM_ESA_LEN];
846 memset(empty, 0, ATM_ESA_LEN);
847
848 start_mpc(mpc, mpc->dev);
849 /* set address if mpcd e.g. gets killed and restarted.
850 * If we do not do it now we have to wait for the next LE_ARP
851 */
852 if (memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0)
853 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
854 }
855
856 __module_get(THIS_MODULE);
857 return arg;
858 }
859
860 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc)
861 {
862 struct k_message mesg;
863
864 memcpy(mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
865
866 mesg.type = SET_MPS_CTRL_ADDR;
867 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
868 msg_to_mpoad(&mesg, mpc);
869 }
870
871 static void mpoad_close(struct atm_vcc *vcc)
872 {
873 struct mpoa_client *mpc;
874 struct sk_buff *skb;
875
876 mpc = find_mpc_by_vcc(vcc);
877 if (mpc == NULL) {
878 pr_info("did not find MPC\n");
879 return;
880 }
881 if (!mpc->mpoad_vcc) {
882 pr_info("close for non-present mpoad\n");
883 return;
884 }
885
886 mpc->mpoad_vcc = NULL;
887 if (mpc->dev) {
888 struct lec_priv *priv = netdev_priv(mpc->dev);
889 priv->lane2_ops->associate_indicator = NULL;
890 stop_mpc(mpc);
891 dev_put(mpc->dev);
892 }
893
894 mpc->in_ops->destroy_cache(mpc);
895 mpc->eg_ops->destroy_cache(mpc);
896
897 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
898 atm_return(vcc, skb->truesize);
899 kfree_skb(skb);
900 }
901
902 pr_info("(%s) going down\n",
903 (mpc->dev) ? mpc->dev->name : "<unknown>");
904 module_put(THIS_MODULE);
905 }
906
907 /*
908 *
909 */
910 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
911 {
912
913 struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
914 struct k_message *mesg = (struct k_message *)skb->data;
915 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
916
917 if (mpc == NULL) {
918 pr_info("no mpc found\n");
919 return 0;
920 }
921 dprintk("(%s)", mpc->dev ? mpc->dev->name : "<unknown>");
922 switch (mesg->type) {
923 case MPOA_RES_REPLY_RCVD:
924 dprintk_cont("mpoa_res_reply_rcvd\n");
925 MPOA_res_reply_rcvd(mesg, mpc);
926 break;
927 case MPOA_TRIGGER_RCVD:
928 dprintk_cont("mpoa_trigger_rcvd\n");
929 MPOA_trigger_rcvd(mesg, mpc);
930 break;
931 case INGRESS_PURGE_RCVD:
932 dprintk_cont("nhrp_purge_rcvd\n");
933 ingress_purge_rcvd(mesg, mpc);
934 break;
935 case EGRESS_PURGE_RCVD:
936 dprintk_cont("egress_purge_reply_rcvd\n");
937 egress_purge_rcvd(mesg, mpc);
938 break;
939 case MPS_DEATH:
940 dprintk_cont("mps_death\n");
941 mps_death(mesg, mpc);
942 break;
943 case CACHE_IMPOS_RCVD:
944 dprintk_cont("cache_impos_rcvd\n");
945 MPOA_cache_impos_rcvd(mesg, mpc);
946 break;
947 case SET_MPC_CTRL_ADDR:
948 dprintk_cont("set_mpc_ctrl_addr\n");
949 set_mpc_ctrl_addr_rcvd(mesg, mpc);
950 break;
951 case SET_MPS_MAC_ADDR:
952 dprintk_cont("set_mps_mac_addr\n");
953 set_mps_mac_addr_rcvd(mesg, mpc);
954 break;
955 case CLEAN_UP_AND_EXIT:
956 dprintk_cont("clean_up_and_exit\n");
957 clean_up(mesg, mpc, DIE);
958 break;
959 case RELOAD:
960 dprintk_cont("reload\n");
961 clean_up(mesg, mpc, RELOAD);
962 break;
963 case SET_MPC_PARAMS:
964 dprintk_cont("set_mpc_params\n");
965 mpc->parameters = mesg->content.params;
966 break;
967 default:
968 dprintk_cont("unknown message %d\n", mesg->type);
969 break;
970 }
971 kfree_skb(skb);
972
973 return 0;
974 }
975
976 /* Remember that this function may not do things that sleep */
977 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
978 {
979 struct sk_buff *skb;
980 struct sock *sk;
981
982 if (mpc == NULL || !mpc->mpoad_vcc) {
983 pr_info("mesg %d to a non-existent mpoad\n", mesg->type);
984 return -ENXIO;
985 }
986
987 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
988 if (skb == NULL)
989 return -ENOMEM;
990 skb_put(skb, sizeof(struct k_message));
991 skb_copy_to_linear_data(skb, mesg, sizeof(*mesg));
992 atm_force_charge(mpc->mpoad_vcc, skb->truesize);
993
994 sk = sk_atm(mpc->mpoad_vcc);
995 skb_queue_tail(&sk->sk_receive_queue, skb);
996 sk->sk_data_ready(sk, skb->len);
997
998 return 0;
999 }
1000
1001 static int mpoa_event_listener(struct notifier_block *mpoa_notifier,
1002 unsigned long event, void *dev_ptr)
1003 {
1004 struct net_device *dev;
1005 struct mpoa_client *mpc;
1006 struct lec_priv *priv;
1007
1008 dev = (struct net_device *)dev_ptr;
1009
1010 if (!net_eq(dev_net(dev), &init_net))
1011 return NOTIFY_DONE;
1012
1013 if (dev->name == NULL || strncmp(dev->name, "lec", 3))
1014 return NOTIFY_DONE; /* we are only interested in lec:s */
1015
1016 switch (event) {
1017 case NETDEV_REGISTER: /* a new lec device was allocated */
1018 priv = netdev_priv(dev);
1019 if (priv->lane_version < 2)
1020 break;
1021 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
1022 mpc = find_mpc_by_itfnum(priv->itfnum);
1023 if (mpc == NULL) {
1024 dprintk("allocating new mpc for %s\n", dev->name);
1025 mpc = alloc_mpc();
1026 if (mpc == NULL) {
1027 pr_info("no new mpc");
1028 break;
1029 }
1030 }
1031 mpc->dev_num = priv->itfnum;
1032 mpc->dev = dev;
1033 dev_hold(dev);
1034 dprintk("(%s) was initialized\n", dev->name);
1035 break;
1036 case NETDEV_UNREGISTER:
1037 /* the lec device was deallocated */
1038 mpc = find_mpc_by_lec(dev);
1039 if (mpc == NULL)
1040 break;
1041 dprintk("device (%s) was deallocated\n", dev->name);
1042 stop_mpc(mpc);
1043 dev_put(mpc->dev);
1044 mpc->dev = NULL;
1045 break;
1046 case NETDEV_UP:
1047 /* the dev was ifconfig'ed up */
1048 mpc = find_mpc_by_lec(dev);
1049 if (mpc == NULL)
1050 break;
1051 if (mpc->mpoad_vcc != NULL)
1052 start_mpc(mpc, dev);
1053 break;
1054 case NETDEV_DOWN:
1055 /* the dev was ifconfig'ed down */
1056 /* this means that the flow of packets from the
1057 * upper layer stops
1058 */
1059 mpc = find_mpc_by_lec(dev);
1060 if (mpc == NULL)
1061 break;
1062 if (mpc->mpoad_vcc != NULL)
1063 stop_mpc(mpc);
1064 break;
1065 case NETDEV_REBOOT:
1066 case NETDEV_CHANGE:
1067 case NETDEV_CHANGEMTU:
1068 case NETDEV_CHANGEADDR:
1069 case NETDEV_GOING_DOWN:
1070 break;
1071 default:
1072 break;
1073 }
1074
1075 return NOTIFY_DONE;
1076 }
1077
1078 /*
1079 * Functions which are called after a message is received from mpcd.
1080 * Msg is reused on purpose.
1081 */
1082
1083
1084 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1085 {
1086 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1087 in_cache_entry *entry;
1088
1089 entry = mpc->in_ops->get(dst_ip, mpc);
1090 if (entry == NULL) {
1091 entry = mpc->in_ops->add_entry(dst_ip, mpc);
1092 entry->entry_state = INGRESS_RESOLVING;
1093 msg->type = SND_MPOA_RES_RQST;
1094 msg->content.in_info = entry->ctrl_info;
1095 msg_to_mpoad(msg, mpc);
1096 do_gettimeofday(&(entry->reply_wait));
1097 mpc->in_ops->put(entry);
1098 return;
1099 }
1100
1101 if (entry->entry_state == INGRESS_INVALID) {
1102 entry->entry_state = INGRESS_RESOLVING;
1103 msg->type = SND_MPOA_RES_RQST;
1104 msg->content.in_info = entry->ctrl_info;
1105 msg_to_mpoad(msg, mpc);
1106 do_gettimeofday(&(entry->reply_wait));
1107 mpc->in_ops->put(entry);
1108 return;
1109 }
1110
1111 pr_info("(%s) entry already in resolving state\n",
1112 (mpc->dev) ? mpc->dev->name : "<unknown>");
1113 mpc->in_ops->put(entry);
1114 }
1115
1116 /*
1117 * Things get complicated because we have to check if there's an egress
1118 * shortcut with suitable traffic parameters we could use.
1119 */
1120 static void check_qos_and_open_shortcut(struct k_message *msg,
1121 struct mpoa_client *client,
1122 in_cache_entry *entry)
1123 {
1124 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1125 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1126 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1127
1128 if (eg_entry && eg_entry->shortcut) {
1129 if (eg_entry->shortcut->qos.txtp.traffic_class &
1130 msg->qos.txtp.traffic_class &
1131 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)) {
1132 if (eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1133 entry->shortcut = eg_entry->shortcut;
1134 else if (eg_entry->shortcut->qos.txtp.max_pcr > 0)
1135 entry->shortcut = eg_entry->shortcut;
1136 }
1137 if (entry->shortcut) {
1138 dprintk("(%s) using egress SVC to reach %pI4\n",
1139 client->dev->name, &dst_ip);
1140 client->eg_ops->put(eg_entry);
1141 return;
1142 }
1143 }
1144 if (eg_entry != NULL)
1145 client->eg_ops->put(eg_entry);
1146
1147 /* No luck in the egress cache we must open an ingress SVC */
1148 msg->type = OPEN_INGRESS_SVC;
1149 if (qos &&
1150 (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class)) {
1151 msg->qos = qos->qos;
1152 pr_info("(%s) trying to get a CBR shortcut\n",
1153 client->dev->name);
1154 } else
1155 memset(&msg->qos, 0, sizeof(struct atm_qos));
1156 msg_to_mpoad(msg, client);
1157 }
1158
1159 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1160 {
1161 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1162 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1163
1164 dprintk("(%s) ip %pI4\n",
1165 mpc->dev->name, &dst_ip);
1166 ddprintk("(%s) entry = %p",
1167 mpc->dev->name, entry);
1168 if (entry == NULL) {
1169 pr_info("(%s) ARGH, received res. reply for an entry that doesn't exist.\n",
1170 mpc->dev->name);
1171 return;
1172 }
1173 ddprintk_cont(" entry_state = %d ", entry->entry_state);
1174
1175 if (entry->entry_state == INGRESS_RESOLVED) {
1176 pr_info("(%s) RESOLVED entry!\n", mpc->dev->name);
1177 mpc->in_ops->put(entry);
1178 return;
1179 }
1180
1181 entry->ctrl_info = msg->content.in_info;
1182 do_gettimeofday(&(entry->tv));
1183 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1184 entry->refresh_time = 0;
1185 ddprintk_cont("entry->shortcut = %p\n", entry->shortcut);
1186
1187 if (entry->entry_state == INGRESS_RESOLVING &&
1188 entry->shortcut != NULL) {
1189 entry->entry_state = INGRESS_RESOLVED;
1190 mpc->in_ops->put(entry);
1191 return; /* Shortcut already open... */
1192 }
1193
1194 if (entry->shortcut != NULL) {
1195 pr_info("(%s) entry->shortcut != NULL, impossible!\n",
1196 mpc->dev->name);
1197 mpc->in_ops->put(entry);
1198 return;
1199 }
1200
1201 check_qos_and_open_shortcut(msg, mpc, entry);
1202 entry->entry_state = INGRESS_RESOLVED;
1203 mpc->in_ops->put(entry);
1204
1205 return;
1206
1207 }
1208
1209 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1210 {
1211 __be32 dst_ip = msg->content.in_info.in_dst_ip;
1212 __be32 mask = msg->ip_mask;
1213 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1214
1215 if (entry == NULL) {
1216 pr_info("(%s) purge for a non-existing entry, ip = %pI4\n",
1217 mpc->dev->name, &dst_ip);
1218 return;
1219 }
1220
1221 do {
1222 dprintk("(%s) removing an ingress entry, ip = %pI4\n",
1223 mpc->dev->name, &dst_ip);
1224 write_lock_bh(&mpc->ingress_lock);
1225 mpc->in_ops->remove_entry(entry, mpc);
1226 write_unlock_bh(&mpc->ingress_lock);
1227 mpc->in_ops->put(entry);
1228 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1229 } while (entry != NULL);
1230 }
1231
1232 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1233 {
1234 __be32 cache_id = msg->content.eg_info.cache_id;
1235 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1236
1237 if (entry == NULL) {
1238 dprintk("(%s) purge for a non-existing entry\n",
1239 mpc->dev->name);
1240 return;
1241 }
1242
1243 write_lock_irq(&mpc->egress_lock);
1244 mpc->eg_ops->remove_entry(entry, mpc);
1245 write_unlock_irq(&mpc->egress_lock);
1246
1247 mpc->eg_ops->put(entry);
1248 }
1249
1250 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
1251 {
1252 struct sock *sk;
1253 struct k_message *purge_msg;
1254 struct sk_buff *skb;
1255
1256 dprintk("entering\n");
1257 if (vcc == NULL) {
1258 pr_info("vcc == NULL\n");
1259 return;
1260 }
1261
1262 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
1263 if (skb == NULL) {
1264 pr_info("out of memory\n");
1265 return;
1266 }
1267
1268 skb_put(skb, sizeof(struct k_message));
1269 memset(skb->data, 0, sizeof(struct k_message));
1270 purge_msg = (struct k_message *)skb->data;
1271 purge_msg->type = DATA_PLANE_PURGE;
1272 if (entry != NULL)
1273 purge_msg->content.eg_info = entry->ctrl_info;
1274
1275 atm_force_charge(vcc, skb->truesize);
1276
1277 sk = sk_atm(vcc);
1278 skb_queue_tail(&sk->sk_receive_queue, skb);
1279 sk->sk_data_ready(sk, skb->len);
1280 dprintk("exiting\n");
1281 }
1282
1283 /*
1284 * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1285 * of the egress shortcuts we have.
1286 */
1287 static void mps_death(struct k_message *msg, struct mpoa_client *mpc)
1288 {
1289 eg_cache_entry *entry;
1290
1291 dprintk("(%s)\n", mpc->dev->name);
1292
1293 if (memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)) {
1294 pr_info("(%s) wrong MPS\n", mpc->dev->name);
1295 return;
1296 }
1297
1298 /* FIXME: This knows too much of the cache structure */
1299 read_lock_irq(&mpc->egress_lock);
1300 entry = mpc->eg_cache;
1301 while (entry != NULL) {
1302 purge_egress_shortcut(entry->shortcut, entry);
1303 entry = entry->next;
1304 }
1305 read_unlock_irq(&mpc->egress_lock);
1306
1307 mpc->in_ops->destroy_cache(mpc);
1308 mpc->eg_ops->destroy_cache(mpc);
1309 }
1310
1311 static void MPOA_cache_impos_rcvd(struct k_message *msg,
1312 struct mpoa_client *mpc)
1313 {
1314 uint16_t holding_time;
1315 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1316
1317 holding_time = msg->content.eg_info.holding_time;
1318 dprintk("(%s) entry = %p, holding_time = %u\n",
1319 mpc->dev->name, entry, holding_time);
1320 if (entry == NULL && holding_time) {
1321 entry = mpc->eg_ops->add_entry(msg, mpc);
1322 mpc->eg_ops->put(entry);
1323 return;
1324 }
1325 if (holding_time) {
1326 mpc->eg_ops->update(entry, holding_time);
1327 return;
1328 }
1329
1330 write_lock_irq(&mpc->egress_lock);
1331 mpc->eg_ops->remove_entry(entry, mpc);
1332 write_unlock_irq(&mpc->egress_lock);
1333
1334 mpc->eg_ops->put(entry);
1335 }
1336
1337 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg,
1338 struct mpoa_client *mpc)
1339 {
1340 struct lec_priv *priv;
1341 int i, retval ;
1342
1343 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1344
1345 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */
1346 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */
1347 tlv[5] = 0x02; /* MPOA client */
1348 tlv[6] = 0x00; /* number of MPS MAC addresses */
1349
1350 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1351 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1352
1353 dprintk("(%s) setting MPC ctrl ATM address to",
1354 mpc->dev ? mpc->dev->name : "<unknown>");
1355 for (i = 7; i < sizeof(tlv); i++)
1356 dprintk_cont(" %02x", tlv[i]);
1357 dprintk_cont("\n");
1358
1359 if (mpc->dev) {
1360 priv = netdev_priv(mpc->dev);
1361 retval = priv->lane2_ops->associate_req(mpc->dev,
1362 mpc->dev->dev_addr,
1363 tlv, sizeof(tlv));
1364 if (retval == 0)
1365 pr_info("(%s) MPOA device type TLV association failed\n",
1366 mpc->dev->name);
1367 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1368 if (retval < 0)
1369 pr_info("(%s) targetless LE_ARP request failed\n",
1370 mpc->dev->name);
1371 }
1372 }
1373
1374 static void set_mps_mac_addr_rcvd(struct k_message *msg,
1375 struct mpoa_client *client)
1376 {
1377
1378 if (client->number_of_mps_macs)
1379 kfree(client->mps_macs);
1380 client->number_of_mps_macs = 0;
1381 client->mps_macs = kmemdup(msg->MPS_ctrl, ETH_ALEN, GFP_KERNEL);
1382 if (client->mps_macs == NULL) {
1383 pr_info("out of memory\n");
1384 return;
1385 }
1386 client->number_of_mps_macs = 1;
1387 }
1388
1389 /*
1390 * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1391 */
1392 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1393 {
1394
1395 eg_cache_entry *entry;
1396 msg->type = SND_EGRESS_PURGE;
1397
1398
1399 /* FIXME: This knows too much of the cache structure */
1400 read_lock_irq(&mpc->egress_lock);
1401 entry = mpc->eg_cache;
1402 while (entry != NULL) {
1403 msg->content.eg_info = entry->ctrl_info;
1404 dprintk("cache_id %u\n", entry->ctrl_info.cache_id);
1405 msg_to_mpoad(msg, mpc);
1406 entry = entry->next;
1407 }
1408 read_unlock_irq(&mpc->egress_lock);
1409
1410 msg->type = action;
1411 msg_to_mpoad(msg, mpc);
1412 }
1413
1414 static void mpc_timer_refresh(void)
1415 {
1416 mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1417 mpc_timer.data = mpc_timer.expires;
1418 mpc_timer.function = mpc_cache_check;
1419 add_timer(&mpc_timer);
1420 }
1421
1422 static void mpc_cache_check(unsigned long checking_time)
1423 {
1424 struct mpoa_client *mpc = mpcs;
1425 static unsigned long previous_resolving_check_time;
1426 static unsigned long previous_refresh_time;
1427
1428 while (mpc != NULL) {
1429 mpc->in_ops->clear_count(mpc);
1430 mpc->eg_ops->clear_expired(mpc);
1431 if (checking_time - previous_resolving_check_time >
1432 mpc->parameters.mpc_p4 * HZ) {
1433 mpc->in_ops->check_resolving(mpc);
1434 previous_resolving_check_time = checking_time;
1435 }
1436 if (checking_time - previous_refresh_time >
1437 mpc->parameters.mpc_p5 * HZ) {
1438 mpc->in_ops->refresh(mpc);
1439 previous_refresh_time = checking_time;
1440 }
1441 mpc = mpc->next;
1442 }
1443 mpc_timer_refresh();
1444 }
1445
1446 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd,
1447 unsigned long arg)
1448 {
1449 int err = 0;
1450 struct atm_vcc *vcc = ATM_SD(sock);
1451
1452 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1453 return -ENOIOCTLCMD;
1454
1455 if (!capable(CAP_NET_ADMIN))
1456 return -EPERM;
1457
1458 switch (cmd) {
1459 case ATMMPC_CTRL:
1460 err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1461 if (err >= 0)
1462 sock->state = SS_CONNECTED;
1463 break;
1464 case ATMMPC_DATA:
1465 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1466 break;
1467 default:
1468 break;
1469 }
1470 return err;
1471 }
1472
1473 static struct atm_ioctl atm_ioctl_ops = {
1474 .owner = THIS_MODULE,
1475 .ioctl = atm_mpoa_ioctl,
1476 };
1477
1478 static __init int atm_mpoa_init(void)
1479 {
1480 register_atm_ioctl(&atm_ioctl_ops);
1481
1482 if (mpc_proc_init() != 0)
1483 pr_info("failed to initialize /proc/mpoa\n");
1484
1485 pr_info("mpc.c: " __DATE__ " " __TIME__ " initialized\n");
1486
1487 return 0;
1488 }
1489
1490 static void __exit atm_mpoa_cleanup(void)
1491 {
1492 struct mpoa_client *mpc, *tmp;
1493 struct atm_mpoa_qos *qos, *nextqos;
1494 struct lec_priv *priv;
1495
1496 mpc_proc_clean();
1497
1498 del_timer(&mpc_timer);
1499 unregister_netdevice_notifier(&mpoa_notifier);
1500 deregister_atm_ioctl(&atm_ioctl_ops);
1501
1502 mpc = mpcs;
1503 mpcs = NULL;
1504 while (mpc != NULL) {
1505 tmp = mpc->next;
1506 if (mpc->dev != NULL) {
1507 stop_mpc(mpc);
1508 priv = netdev_priv(mpc->dev);
1509 if (priv->lane2_ops != NULL)
1510 priv->lane2_ops->associate_indicator = NULL;
1511 }
1512 ddprintk("about to clear caches\n");
1513 mpc->in_ops->destroy_cache(mpc);
1514 mpc->eg_ops->destroy_cache(mpc);
1515 ddprintk("caches cleared\n");
1516 kfree(mpc->mps_macs);
1517 memset(mpc, 0, sizeof(struct mpoa_client));
1518 ddprintk("about to kfree %p\n", mpc);
1519 kfree(mpc);
1520 ddprintk("next mpc is at %p\n", tmp);
1521 mpc = tmp;
1522 }
1523
1524 qos = qos_head;
1525 qos_head = NULL;
1526 while (qos != NULL) {
1527 nextqos = qos->next;
1528 dprintk("freeing qos entry %p\n", qos);
1529 kfree(qos);
1530 qos = nextqos;
1531 }
1532 }
1533
1534 module_init(atm_mpoa_init);
1535 module_exit(atm_mpoa_cleanup);
1536
1537 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree