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mpc.c
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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,
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  */
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 
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  */
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 */
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,
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 {
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 (ether_addr_equal(eth->h_dest, mpc->mps_macs + i * ETH_ALEN))
596  if (send_via_shortcut(skb, mpc) == 0) /* try shortcut */
597  return NETDEV_TX_OK;
598  i++;
599  }
600 
601 non_ip:
602  return mpc->old_ops->ndo_start_xmit(skb, dev);
603 }
604 
605 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
606 {
607  int bytes_left;
608  struct mpoa_client *mpc;
609  struct atmmpc_ioc ioc_data;
610  in_cache_entry *in_entry;
611  __be32 ipaddr;
612 
613  bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
614  if (bytes_left != 0) {
615  pr_info("mpoa:Short read (missed %d bytes) from userland\n",
616  bytes_left);
617  return -EFAULT;
618  }
619  ipaddr = ioc_data.ipaddr;
620  if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
621  return -EINVAL;
622 
623  mpc = find_mpc_by_itfnum(ioc_data.dev_num);
624  if (mpc == NULL)
625  return -EINVAL;
626 
627  if (ioc_data.type == MPC_SOCKET_INGRESS) {
628  in_entry = mpc->in_ops->get(ipaddr, mpc);
629  if (in_entry == NULL ||
630  in_entry->entry_state < INGRESS_RESOLVED) {
631  pr_info("(%s) did not find RESOLVED entry from ingress cache\n",
632  mpc->dev->name);
633  if (in_entry != NULL)
634  mpc->in_ops->put(in_entry);
635  return -EINVAL;
636  }
637  pr_info("(%s) attaching ingress SVC, entry = %pI4\n",
638  mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
639  in_entry->shortcut = vcc;
640  mpc->in_ops->put(in_entry);
641  } else {
642  pr_info("(%s) attaching egress SVC\n", mpc->dev->name);
643  }
644 
645  vcc->proto_data = mpc->dev;
646  vcc->push = mpc_push;
647 
648  return 0;
649 }
650 
651 /*
652  *
653  */
654 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
655 {
656  struct mpoa_client *mpc;
657  in_cache_entry *in_entry;
658  eg_cache_entry *eg_entry;
659 
660  mpc = find_mpc_by_lec(dev);
661  if (mpc == NULL) {
662  pr_info("(%s) close for unknown MPC\n", dev->name);
663  return;
664  }
665 
666  dprintk("(%s)\n", dev->name);
667  in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
668  if (in_entry) {
669  dprintk("(%s) ingress SVC closed ip = %pI4\n",
670  mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
671  in_entry->shortcut = NULL;
672  mpc->in_ops->put(in_entry);
673  }
674  eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
675  if (eg_entry) {
676  dprintk("(%s) egress SVC closed\n", mpc->dev->name);
677  eg_entry->shortcut = NULL;
678  mpc->eg_ops->put(eg_entry);
679  }
680 
681  if (in_entry == NULL && eg_entry == NULL)
682  dprintk("(%s) unused vcc closed\n", dev->name);
683 }
684 
685 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
686 {
687  struct net_device *dev = (struct net_device *)vcc->proto_data;
688  struct sk_buff *new_skb;
689  eg_cache_entry *eg;
690  struct mpoa_client *mpc;
691  __be32 tag;
692  char *tmp;
693 
694  ddprintk("(%s)\n", dev->name);
695  if (skb == NULL) {
696  dprintk("(%s) null skb, closing VCC\n", dev->name);
697  mpc_vcc_close(vcc, dev);
698  return;
699  }
700 
701  skb->dev = dev;
702  if (memcmp(skb->data, &llc_snap_mpoa_ctrl,
703  sizeof(struct llc_snap_hdr)) == 0) {
704  struct sock *sk = sk_atm(vcc);
705 
706  dprintk("(%s) control packet arrived\n", dev->name);
707  /* Pass control packets to daemon */
708  skb_queue_tail(&sk->sk_receive_queue, skb);
709  sk->sk_data_ready(sk, skb->len);
710  return;
711  }
712 
713  /* data coming over the shortcut */
714  atm_return(vcc, skb->truesize);
715 
716  mpc = find_mpc_by_lec(dev);
717  if (mpc == NULL) {
718  pr_info("(%s) unknown MPC\n", dev->name);
719  return;
720  }
721 
722  if (memcmp(skb->data, &llc_snap_mpoa_data_tagged,
723  sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
724  ddprintk("(%s) tagged data packet arrived\n", dev->name);
725 
726  } else if (memcmp(skb->data, &llc_snap_mpoa_data,
727  sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
728  pr_info("(%s) Unsupported non-tagged data packet arrived. Purging\n",
729  dev->name);
730  dev_kfree_skb_any(skb);
731  return;
732  } else {
733  pr_info("(%s) garbage arrived, purging\n", dev->name);
734  dev_kfree_skb_any(skb);
735  return;
736  }
737 
738  tmp = skb->data + sizeof(struct llc_snap_hdr);
739  tag = *(__be32 *)tmp;
740 
741  eg = mpc->eg_ops->get_by_tag(tag, mpc);
742  if (eg == NULL) {
743  pr_info("mpoa: (%s) Didn't find egress cache entry, tag = %u\n",
744  dev->name, tag);
745  purge_egress_shortcut(vcc, NULL);
746  dev_kfree_skb_any(skb);
747  return;
748  }
749 
750  /*
751  * See if ingress MPC is using shortcut we opened as a return channel.
752  * This means we have a bi-directional vcc opened by us.
753  */
754  if (eg->shortcut == NULL) {
755  eg->shortcut = vcc;
756  pr_info("(%s) egress SVC in use\n", dev->name);
757  }
758 
759  skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag));
760  /* get rid of LLC/SNAP header */
761  new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length);
762  /* LLC/SNAP is shorter than MAC header :( */
763  dev_kfree_skb_any(skb);
764  if (new_skb == NULL) {
765  mpc->eg_ops->put(eg);
766  return;
767  }
768  skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */
769  skb_copy_to_linear_data(new_skb, eg->ctrl_info.DLL_header,
770  eg->ctrl_info.DH_length);
771  new_skb->protocol = eth_type_trans(new_skb, dev);
772  skb_reset_network_header(new_skb);
773 
774  eg->latest_ip_addr = ip_hdr(new_skb)->saddr;
775  eg->packets_rcvd++;
776  mpc->eg_ops->put(eg);
777 
778  memset(ATM_SKB(new_skb), 0, sizeof(struct atm_skb_data));
779  netif_rx(new_skb);
780 }
781 
782 static struct atmdev_ops mpc_ops = { /* only send is required */
783  .close = mpoad_close,
784  .send = msg_from_mpoad
785 };
786 
787 static struct atm_dev mpc_dev = {
788  .ops = &mpc_ops,
789  .type = "mpc",
790  .number = 42,
791  .lock = __SPIN_LOCK_UNLOCKED(mpc_dev.lock)
792  /* members not explicitly initialised will be 0 */
793 };
794 
795 static int atm_mpoa_mpoad_attach(struct atm_vcc *vcc, int arg)
796 {
797  struct mpoa_client *mpc;
798  struct lec_priv *priv;
799  int err;
800 
801  if (mpcs == NULL) {
802  init_timer(&mpc_timer);
803  mpc_timer_refresh();
804 
805  /* This lets us now how our LECs are doing */
806  err = register_netdevice_notifier(&mpoa_notifier);
807  if (err < 0) {
808  del_timer(&mpc_timer);
809  return err;
810  }
811  }
812 
813  mpc = find_mpc_by_itfnum(arg);
814  if (mpc == NULL) {
815  dprintk("allocating new mpc for itf %d\n", arg);
816  mpc = alloc_mpc();
817  if (mpc == NULL)
818  return -ENOMEM;
819  mpc->dev_num = arg;
820  mpc->dev = find_lec_by_itfnum(arg);
821  /* NULL if there was no lec */
822  }
823  if (mpc->mpoad_vcc) {
824  pr_info("mpoad is already present for itf %d\n", arg);
825  return -EADDRINUSE;
826  }
827 
828  if (mpc->dev) { /* check if the lec is LANE2 capable */
829  priv = netdev_priv(mpc->dev);
830  if (priv->lane_version < 2) {
831  dev_put(mpc->dev);
832  mpc->dev = NULL;
833  } else
834  priv->lane2_ops->associate_indicator = lane2_assoc_ind;
835  }
836 
837  mpc->mpoad_vcc = vcc;
838  vcc->dev = &mpc_dev;
839  vcc_insert_socket(sk_atm(vcc));
840  set_bit(ATM_VF_META, &vcc->flags);
841  set_bit(ATM_VF_READY, &vcc->flags);
842 
843  if (mpc->dev) {
844  char empty[ATM_ESA_LEN];
845  memset(empty, 0, ATM_ESA_LEN);
846 
847  start_mpc(mpc, mpc->dev);
848  /* set address if mpcd e.g. gets killed and restarted.
849  * If we do not do it now we have to wait for the next LE_ARP
850  */
851  if (memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0)
852  send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
853  }
854 
855  __module_get(THIS_MODULE);
856  return arg;
857 }
858 
859 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc)
860 {
861  struct k_message mesg;
862 
863  memcpy(mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
864 
865  mesg.type = SET_MPS_CTRL_ADDR;
866  memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
867  msg_to_mpoad(&mesg, mpc);
868 }
869 
870 static void mpoad_close(struct atm_vcc *vcc)
871 {
872  struct mpoa_client *mpc;
873  struct sk_buff *skb;
874 
875  mpc = find_mpc_by_vcc(vcc);
876  if (mpc == NULL) {
877  pr_info("did not find MPC\n");
878  return;
879  }
880  if (!mpc->mpoad_vcc) {
881  pr_info("close for non-present mpoad\n");
882  return;
883  }
884 
885  mpc->mpoad_vcc = NULL;
886  if (mpc->dev) {
887  struct lec_priv *priv = netdev_priv(mpc->dev);
888  priv->lane2_ops->associate_indicator = NULL;
889  stop_mpc(mpc);
890  dev_put(mpc->dev);
891  }
892 
893  mpc->in_ops->destroy_cache(mpc);
894  mpc->eg_ops->destroy_cache(mpc);
895 
896  while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
897  atm_return(vcc, skb->truesize);
898  kfree_skb(skb);
899  }
900 
901  pr_info("(%s) going down\n",
902  (mpc->dev) ? mpc->dev->name : "<unknown>");
903  module_put(THIS_MODULE);
904 }
905 
906 /*
907  *
908  */
909 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
910 {
911 
912  struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
913  struct k_message *mesg = (struct k_message *)skb->data;
914  atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
915 
916  if (mpc == NULL) {
917  pr_info("no mpc found\n");
918  return 0;
919  }
920  dprintk("(%s)", mpc->dev ? mpc->dev->name : "<unknown>");
921  switch (mesg->type) {
922  case MPOA_RES_REPLY_RCVD:
923  dprintk_cont("mpoa_res_reply_rcvd\n");
924  MPOA_res_reply_rcvd(mesg, mpc);
925  break;
926  case MPOA_TRIGGER_RCVD:
927  dprintk_cont("mpoa_trigger_rcvd\n");
928  MPOA_trigger_rcvd(mesg, mpc);
929  break;
930  case INGRESS_PURGE_RCVD:
931  dprintk_cont("nhrp_purge_rcvd\n");
932  ingress_purge_rcvd(mesg, mpc);
933  break;
934  case EGRESS_PURGE_RCVD:
935  dprintk_cont("egress_purge_reply_rcvd\n");
936  egress_purge_rcvd(mesg, mpc);
937  break;
938  case MPS_DEATH:
939  dprintk_cont("mps_death\n");
940  mps_death(mesg, mpc);
941  break;
942  case CACHE_IMPOS_RCVD:
943  dprintk_cont("cache_impos_rcvd\n");
944  MPOA_cache_impos_rcvd(mesg, mpc);
945  break;
946  case SET_MPC_CTRL_ADDR:
947  dprintk_cont("set_mpc_ctrl_addr\n");
948  set_mpc_ctrl_addr_rcvd(mesg, mpc);
949  break;
950  case SET_MPS_MAC_ADDR:
951  dprintk_cont("set_mps_mac_addr\n");
952  set_mps_mac_addr_rcvd(mesg, mpc);
953  break;
954  case CLEAN_UP_AND_EXIT:
955  dprintk_cont("clean_up_and_exit\n");
956  clean_up(mesg, mpc, DIE);
957  break;
958  case RELOAD:
959  dprintk_cont("reload\n");
960  clean_up(mesg, mpc, RELOAD);
961  break;
962  case SET_MPC_PARAMS:
963  dprintk_cont("set_mpc_params\n");
964  mpc->parameters = mesg->content.params;
965  break;
966  default:
967  dprintk_cont("unknown message %d\n", mesg->type);
968  break;
969  }
970  kfree_skb(skb);
971 
972  return 0;
973 }
974 
975 /* Remember that this function may not do things that sleep */
976 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
977 {
978  struct sk_buff *skb;
979  struct sock *sk;
980 
981  if (mpc == NULL || !mpc->mpoad_vcc) {
982  pr_info("mesg %d to a non-existent mpoad\n", mesg->type);
983  return -ENXIO;
984  }
985 
986  skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
987  if (skb == NULL)
988  return -ENOMEM;
989  skb_put(skb, sizeof(struct k_message));
990  skb_copy_to_linear_data(skb, mesg, sizeof(*mesg));
991  atm_force_charge(mpc->mpoad_vcc, skb->truesize);
992 
993  sk = sk_atm(mpc->mpoad_vcc);
994  skb_queue_tail(&sk->sk_receive_queue, skb);
995  sk->sk_data_ready(sk, skb->len);
996 
997  return 0;
998 }
999 
1000 static int mpoa_event_listener(struct notifier_block *mpoa_notifier,
1001  unsigned long event, void *dev_ptr)
1002 {
1003  struct net_device *dev;
1004  struct mpoa_client *mpc;
1005  struct lec_priv *priv;
1006 
1007  dev = dev_ptr;
1008 
1009  if (!net_eq(dev_net(dev), &init_net))
1010  return NOTIFY_DONE;
1011 
1012  if (dev->name == NULL || strncmp(dev->name, "lec", 3))
1013  return NOTIFY_DONE; /* we are only interested in lec:s */
1014 
1015  switch (event) {
1016  case NETDEV_REGISTER: /* a new lec device was allocated */
1017  priv = netdev_priv(dev);
1018  if (priv->lane_version < 2)
1019  break;
1020  priv->lane2_ops->associate_indicator = lane2_assoc_ind;
1021  mpc = find_mpc_by_itfnum(priv->itfnum);
1022  if (mpc == NULL) {
1023  dprintk("allocating new mpc for %s\n", dev->name);
1024  mpc = alloc_mpc();
1025  if (mpc == NULL) {
1026  pr_info("no new mpc");
1027  break;
1028  }
1029  }
1030  mpc->dev_num = priv->itfnum;
1031  mpc->dev = dev;
1032  dev_hold(dev);
1033  dprintk("(%s) was initialized\n", dev->name);
1034  break;
1035  case NETDEV_UNREGISTER:
1036  /* the lec device was deallocated */
1037  mpc = find_mpc_by_lec(dev);
1038  if (mpc == NULL)
1039  break;
1040  dprintk("device (%s) was deallocated\n", dev->name);
1041  stop_mpc(mpc);
1042  dev_put(mpc->dev);
1043  mpc->dev = NULL;
1044  break;
1045  case NETDEV_UP:
1046  /* the dev was ifconfig'ed up */
1047  mpc = find_mpc_by_lec(dev);
1048  if (mpc == NULL)
1049  break;
1050  if (mpc->mpoad_vcc != NULL)
1051  start_mpc(mpc, dev);
1052  break;
1053  case NETDEV_DOWN:
1054  /* the dev was ifconfig'ed down */
1055  /* this means that the flow of packets from the
1056  * upper layer stops
1057  */
1058  mpc = find_mpc_by_lec(dev);
1059  if (mpc == NULL)
1060  break;
1061  if (mpc->mpoad_vcc != NULL)
1062  stop_mpc(mpc);
1063  break;
1064  case NETDEV_REBOOT:
1065  case NETDEV_CHANGE:
1066  case NETDEV_CHANGEMTU:
1067  case NETDEV_CHANGEADDR:
1068  case NETDEV_GOING_DOWN:
1069  break;
1070  default:
1071  break;
1072  }
1073 
1074  return NOTIFY_DONE;
1075 }
1076 
1077 /*
1078  * Functions which are called after a message is received from mpcd.
1079  * Msg is reused on purpose.
1080  */
1081 
1082 
1083 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1084 {
1085  __be32 dst_ip = msg->content.in_info.in_dst_ip;
1087 
1088  entry = mpc->in_ops->get(dst_ip, mpc);
1089  if (entry == NULL) {
1090  entry = mpc->in_ops->add_entry(dst_ip, mpc);
1091  entry->entry_state = INGRESS_RESOLVING;
1092  msg->type = SND_MPOA_RES_RQST;
1093  msg->content.in_info = entry->ctrl_info;
1094  msg_to_mpoad(msg, mpc);
1095  do_gettimeofday(&(entry->reply_wait));
1096  mpc->in_ops->put(entry);
1097  return;
1098  }
1099 
1100  if (entry->entry_state == INGRESS_INVALID) {
1101  entry->entry_state = INGRESS_RESOLVING;
1102  msg->type = SND_MPOA_RES_RQST;
1103  msg->content.in_info = entry->ctrl_info;
1104  msg_to_mpoad(msg, mpc);
1105  do_gettimeofday(&(entry->reply_wait));
1106  mpc->in_ops->put(entry);
1107  return;
1108  }
1109 
1110  pr_info("(%s) entry already in resolving state\n",
1111  (mpc->dev) ? mpc->dev->name : "<unknown>");
1112  mpc->in_ops->put(entry);
1113 }
1114 
1115 /*
1116  * Things get complicated because we have to check if there's an egress
1117  * shortcut with suitable traffic parameters we could use.
1118  */
1119 static void check_qos_and_open_shortcut(struct k_message *msg,
1120  struct mpoa_client *client,
1121  in_cache_entry *entry)
1122 {
1123  __be32 dst_ip = msg->content.in_info.in_dst_ip;
1124  struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1125  eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1126 
1127  if (eg_entry && eg_entry->shortcut) {
1128  if (eg_entry->shortcut->qos.txtp.traffic_class &
1129  msg->qos.txtp.traffic_class &
1130  (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)) {
1131  if (eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1132  entry->shortcut = eg_entry->shortcut;
1133  else if (eg_entry->shortcut->qos.txtp.max_pcr > 0)
1134  entry->shortcut = eg_entry->shortcut;
1135  }
1136  if (entry->shortcut) {
1137  dprintk("(%s) using egress SVC to reach %pI4\n",
1138  client->dev->name, &dst_ip);
1139  client->eg_ops->put(eg_entry);
1140  return;
1141  }
1142  }
1143  if (eg_entry != NULL)
1144  client->eg_ops->put(eg_entry);
1145 
1146  /* No luck in the egress cache we must open an ingress SVC */
1147  msg->type = OPEN_INGRESS_SVC;
1148  if (qos &&
1149  (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class)) {
1150  msg->qos = qos->qos;
1151  pr_info("(%s) trying to get a CBR shortcut\n",
1152  client->dev->name);
1153  } else
1154  memset(&msg->qos, 0, sizeof(struct atm_qos));
1155  msg_to_mpoad(msg, client);
1156 }
1157 
1158 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1159 {
1160  __be32 dst_ip = msg->content.in_info.in_dst_ip;
1161  in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1162 
1163  dprintk("(%s) ip %pI4\n",
1164  mpc->dev->name, &dst_ip);
1165  ddprintk("(%s) entry = %p",
1166  mpc->dev->name, entry);
1167  if (entry == NULL) {
1168  pr_info("(%s) ARGH, received res. reply for an entry that doesn't exist.\n",
1169  mpc->dev->name);
1170  return;
1171  }
1172  ddprintk_cont(" entry_state = %d ", entry->entry_state);
1173 
1174  if (entry->entry_state == INGRESS_RESOLVED) {
1175  pr_info("(%s) RESOLVED entry!\n", mpc->dev->name);
1176  mpc->in_ops->put(entry);
1177  return;
1178  }
1179 
1180  entry->ctrl_info = msg->content.in_info;
1181  do_gettimeofday(&(entry->tv));
1182  do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1183  entry->refresh_time = 0;
1184  ddprintk_cont("entry->shortcut = %p\n", entry->shortcut);
1185 
1186  if (entry->entry_state == INGRESS_RESOLVING &&
1187  entry->shortcut != NULL) {
1188  entry->entry_state = INGRESS_RESOLVED;
1189  mpc->in_ops->put(entry);
1190  return; /* Shortcut already open... */
1191  }
1192 
1193  if (entry->shortcut != NULL) {
1194  pr_info("(%s) entry->shortcut != NULL, impossible!\n",
1195  mpc->dev->name);
1196  mpc->in_ops->put(entry);
1197  return;
1198  }
1199 
1200  check_qos_and_open_shortcut(msg, mpc, entry);
1201  entry->entry_state = INGRESS_RESOLVED;
1202  mpc->in_ops->put(entry);
1203 
1204  return;
1205 
1206 }
1207 
1208 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1209 {
1210  __be32 dst_ip = msg->content.in_info.in_dst_ip;
1211  __be32 mask = msg->ip_mask;
1212  in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1213 
1214  if (entry == NULL) {
1215  pr_info("(%s) purge for a non-existing entry, ip = %pI4\n",
1216  mpc->dev->name, &dst_ip);
1217  return;
1218  }
1219 
1220  do {
1221  dprintk("(%s) removing an ingress entry, ip = %pI4\n",
1222  mpc->dev->name, &dst_ip);
1223  write_lock_bh(&mpc->ingress_lock);
1224  mpc->in_ops->remove_entry(entry, mpc);
1226  mpc->in_ops->put(entry);
1227  entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1228  } while (entry != NULL);
1229 }
1230 
1231 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1232 {
1233  __be32 cache_id = msg->content.eg_info.cache_id;
1234  eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1235 
1236  if (entry == NULL) {
1237  dprintk("(%s) purge for a non-existing entry\n",
1238  mpc->dev->name);
1239  return;
1240  }
1241 
1242  write_lock_irq(&mpc->egress_lock);
1243  mpc->eg_ops->remove_entry(entry, mpc);
1245 
1246  mpc->eg_ops->put(entry);
1247 }
1248 
1249 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
1250 {
1251  struct sock *sk;
1252  struct k_message *purge_msg;
1253  struct sk_buff *skb;
1254 
1255  dprintk("entering\n");
1256  if (vcc == NULL) {
1257  pr_info("vcc == NULL\n");
1258  return;
1259  }
1260 
1261  skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
1262  if (skb == NULL) {
1263  pr_info("out of memory\n");
1264  return;
1265  }
1266 
1267  skb_put(skb, sizeof(struct k_message));
1268  memset(skb->data, 0, sizeof(struct k_message));
1269  purge_msg = (struct k_message *)skb->data;
1270  purge_msg->type = DATA_PLANE_PURGE;
1271  if (entry != NULL)
1272  purge_msg->content.eg_info = entry->ctrl_info;
1273 
1274  atm_force_charge(vcc, skb->truesize);
1275 
1276  sk = sk_atm(vcc);
1277  skb_queue_tail(&sk->sk_receive_queue, skb);
1278  sk->sk_data_ready(sk, skb->len);
1279  dprintk("exiting\n");
1280 }
1281 
1282 /*
1283  * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1284  * of the egress shortcuts we have.
1285  */
1286 static void mps_death(struct k_message *msg, struct mpoa_client *mpc)
1287 {
1289 
1290  dprintk("(%s)\n", mpc->dev->name);
1291 
1292  if (memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)) {
1293  pr_info("(%s) wrong MPS\n", mpc->dev->name);
1294  return;
1295  }
1296 
1297  /* FIXME: This knows too much of the cache structure */
1298  read_lock_irq(&mpc->egress_lock);
1299  entry = mpc->eg_cache;
1300  while (entry != NULL) {
1301  purge_egress_shortcut(entry->shortcut, entry);
1302  entry = entry->next;
1303  }
1305 
1306  mpc->in_ops->destroy_cache(mpc);
1307  mpc->eg_ops->destroy_cache(mpc);
1308 }
1309 
1310 static void MPOA_cache_impos_rcvd(struct k_message *msg,
1311  struct mpoa_client *mpc)
1312 {
1313  uint16_t holding_time;
1314  eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1315 
1316  holding_time = msg->content.eg_info.holding_time;
1317  dprintk("(%s) entry = %p, holding_time = %u\n",
1318  mpc->dev->name, entry, holding_time);
1319  if (entry == NULL && holding_time) {
1320  entry = mpc->eg_ops->add_entry(msg, mpc);
1321  mpc->eg_ops->put(entry);
1322  return;
1323  }
1324  if (holding_time) {
1325  mpc->eg_ops->update(entry, holding_time);
1326  return;
1327  }
1328 
1329  write_lock_irq(&mpc->egress_lock);
1330  mpc->eg_ops->remove_entry(entry, mpc);
1332 
1333  mpc->eg_ops->put(entry);
1334 }
1335 
1336 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg,
1337  struct mpoa_client *mpc)
1338 {
1339  struct lec_priv *priv;
1340  int i, retval ;
1341 
1342  uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1343 
1344  tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */
1345  tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */
1346  tlv[5] = 0x02; /* MPOA client */
1347  tlv[6] = 0x00; /* number of MPS MAC addresses */
1348 
1349  memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1350  memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1351 
1352  dprintk("(%s) setting MPC ctrl ATM address to",
1353  mpc->dev ? mpc->dev->name : "<unknown>");
1354  for (i = 7; i < sizeof(tlv); i++)
1355  dprintk_cont(" %02x", tlv[i]);
1356  dprintk_cont("\n");
1357 
1358  if (mpc->dev) {
1359  priv = netdev_priv(mpc->dev);
1360  retval = priv->lane2_ops->associate_req(mpc->dev,
1361  mpc->dev->dev_addr,
1362  tlv, sizeof(tlv));
1363  if (retval == 0)
1364  pr_info("(%s) MPOA device type TLV association failed\n",
1365  mpc->dev->name);
1366  retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1367  if (retval < 0)
1368  pr_info("(%s) targetless LE_ARP request failed\n",
1369  mpc->dev->name);
1370  }
1371 }
1372 
1373 static void set_mps_mac_addr_rcvd(struct k_message *msg,
1374  struct mpoa_client *client)
1375 {
1376 
1377  if (client->number_of_mps_macs)
1378  kfree(client->mps_macs);
1379  client->number_of_mps_macs = 0;
1380  client->mps_macs = kmemdup(msg->MPS_ctrl, ETH_ALEN, GFP_KERNEL);
1381  if (client->mps_macs == NULL) {
1382  pr_info("out of memory\n");
1383  return;
1384  }
1385  client->number_of_mps_macs = 1;
1386 }
1387 
1388 /*
1389  * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1390  */
1391 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1392 {
1393 
1395  msg->type = SND_EGRESS_PURGE;
1396 
1397 
1398  /* FIXME: This knows too much of the cache structure */
1399  read_lock_irq(&mpc->egress_lock);
1400  entry = mpc->eg_cache;
1401  while (entry != NULL) {
1402  msg->content.eg_info = entry->ctrl_info;
1403  dprintk("cache_id %u\n", entry->ctrl_info.cache_id);
1404  msg_to_mpoad(msg, mpc);
1405  entry = entry->next;
1406  }
1408 
1409  msg->type = action;
1410  msg_to_mpoad(msg, mpc);
1411 }
1412 
1413 static void mpc_timer_refresh(void)
1414 {
1415  mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1416  mpc_timer.data = mpc_timer.expires;
1417  mpc_timer.function = mpc_cache_check;
1418  add_timer(&mpc_timer);
1419 }
1420 
1421 static void mpc_cache_check(unsigned long checking_time)
1422 {
1423  struct mpoa_client *mpc = mpcs;
1424  static unsigned long previous_resolving_check_time;
1425  static unsigned long previous_refresh_time;
1426 
1427  while (mpc != NULL) {
1428  mpc->in_ops->clear_count(mpc);
1429  mpc->eg_ops->clear_expired(mpc);
1430  if (checking_time - previous_resolving_check_time >
1431  mpc->parameters.mpc_p4 * HZ) {
1432  mpc->in_ops->check_resolving(mpc);
1433  previous_resolving_check_time = checking_time;
1434  }
1435  if (checking_time - previous_refresh_time >
1436  mpc->parameters.mpc_p5 * HZ) {
1437  mpc->in_ops->refresh(mpc);
1438  previous_refresh_time = checking_time;
1439  }
1440  mpc = mpc->next;
1441  }
1442  mpc_timer_refresh();
1443 }
1444 
1445 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd,
1446  unsigned long arg)
1447 {
1448  int err = 0;
1449  struct atm_vcc *vcc = ATM_SD(sock);
1450 
1451  if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1452  return -ENOIOCTLCMD;
1453 
1454  if (!capable(CAP_NET_ADMIN))
1455  return -EPERM;
1456 
1457  switch (cmd) {
1458  case ATMMPC_CTRL:
1459  err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1460  if (err >= 0)
1461  sock->state = SS_CONNECTED;
1462  break;
1463  case ATMMPC_DATA:
1464  err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1465  break;
1466  default:
1467  break;
1468  }
1469  return err;
1470 }
1471 
1472 static struct atm_ioctl atm_ioctl_ops = {
1473  .owner = THIS_MODULE,
1474  .ioctl = atm_mpoa_ioctl,
1475 };
1476 
1477 static __init int atm_mpoa_init(void)
1478 {
1479  register_atm_ioctl(&atm_ioctl_ops);
1480 
1481  if (mpc_proc_init() != 0)
1482  pr_info("failed to initialize /proc/mpoa\n");
1483 
1484  pr_info("mpc.c: initialized\n");
1485 
1486  return 0;
1487 }
1488 
1489 static void __exit atm_mpoa_cleanup(void)
1490 {
1491  struct mpoa_client *mpc, *tmp;
1492  struct atm_mpoa_qos *qos, *nextqos;
1493  struct lec_priv *priv;
1494 
1495  mpc_proc_clean();
1496 
1497  del_timer(&mpc_timer);
1498  unregister_netdevice_notifier(&mpoa_notifier);
1499  deregister_atm_ioctl(&atm_ioctl_ops);
1500 
1501  mpc = mpcs;
1502  mpcs = NULL;
1503  while (mpc != NULL) {
1504  tmp = mpc->next;
1505  if (mpc->dev != NULL) {
1506  stop_mpc(mpc);
1507  priv = netdev_priv(mpc->dev);
1508  if (priv->lane2_ops != NULL)
1509  priv->lane2_ops->associate_indicator = NULL;
1510  }
1511  ddprintk("about to clear caches\n");
1512  mpc->in_ops->destroy_cache(mpc);
1513  mpc->eg_ops->destroy_cache(mpc);
1514  ddprintk("caches cleared\n");
1515  kfree(mpc->mps_macs);
1516  memset(mpc, 0, sizeof(struct mpoa_client));
1517  ddprintk("about to kfree %p\n", mpc);
1518  kfree(mpc);
1519  ddprintk("next mpc is at %p\n", tmp);
1520  mpc = tmp;
1521  }
1522 
1523  qos = qos_head;
1524  qos_head = NULL;
1525  while (qos != NULL) {
1526  nextqos = qos->next;
1527  dprintk("freeing qos entry %p\n", qos);
1528  kfree(qos);
1529  qos = nextqos;
1530  }
1531 }
1532 
1533 module_init(atm_mpoa_init);
1534 module_exit(atm_mpoa_cleanup);
1535 
1536 MODULE_LICENSE("GPL");