~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/atm/mpc.c

Version: ~ [ linux-5.8 ] ~ [ linux-5.7.12 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.55 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.136 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.191 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.232 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.232 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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         ether_addr_copy(mpc->mps_macs, router_mac);
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 (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 __netdev_start_xmit(mpc->old_ops, skb, dev, false);
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);
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);
996 
997         return 0;
998 }
999 
1000 static int mpoa_event_listener(struct notifier_block *mpoa_notifier,
1001                                unsigned long event, void *ptr)
1002 {
1003         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1004         struct mpoa_client *mpc;
1005         struct lec_priv *priv;
1006 
1007         if (!net_eq(dev_net(dev), &init_net))
1008                 return NOTIFY_DONE;
1009 
1010         if (dev->name == NULL || strncmp(dev->name, "lec", 3))
1011                 return NOTIFY_DONE; /* we are only interested in lec:s */
1012 
1013         switch (event) {
1014         case NETDEV_REGISTER:       /* a new lec device was allocated */
1015                 priv = netdev_priv(dev);
1016                 if (priv->lane_version < 2)
1017                         break;
1018                 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
1019                 mpc = find_mpc_by_itfnum(priv->itfnum);
1020                 if (mpc == NULL) {
1021                         dprintk("allocating new mpc for %s\n", dev->name);
1022                         mpc = alloc_mpc();
1023                         if (mpc == NULL) {
1024                                 pr_info("no new mpc");
1025                                 break;
1026                         }
1027                 }
1028                 mpc->dev_num = priv->itfnum;
1029                 mpc->dev = dev;
1030                 dev_hold(dev);
1031                 dprintk("(%s) was initialized\n", dev->name);
1032                 break;
1033         case NETDEV_UNREGISTER:
1034                 /* the lec device was deallocated */
1035                 mpc = find_mpc_by_lec(dev);
1036                 if (mpc == NULL)
1037                         break;
1038                 dprintk("device (%s) was deallocated\n", dev->name);
1039                 stop_mpc(mpc);
1040                 dev_put(mpc->dev);
1041                 mpc->dev = NULL;
1042                 break;
1043         case NETDEV_UP:
1044                 /* the dev was ifconfig'ed up */
1045                 mpc = find_mpc_by_lec(dev);
1046                 if (mpc == NULL)
1047                         break;
1048                 if (mpc->mpoad_vcc != NULL)
1049                         start_mpc(mpc, dev);
1050                 break;
1051         case NETDEV_DOWN:
1052                 /* the dev was ifconfig'ed down */
1053                 /* this means that the flow of packets from the
1054                  * upper layer stops
1055                  */
1056                 mpc = find_mpc_by_lec(dev);
1057                 if (mpc == NULL)
1058                         break;
1059                 if (mpc->mpoad_vcc != NULL)
1060                         stop_mpc(mpc);
1061                 break;
1062         case NETDEV_REBOOT:
1063         case NETDEV_CHANGE:
1064         case NETDEV_CHANGEMTU:
1065         case NETDEV_CHANGEADDR:
1066         case NETDEV_GOING_DOWN:
1067                 break;
1068         default:
1069                 break;
1070         }
1071 
1072         return NOTIFY_DONE;
1073 }
1074 
1075 /*
1076  * Functions which are called after a message is received from mpcd.
1077  * Msg is reused on purpose.
1078  */
1079 
1080 
1081 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1082 {
1083         __be32 dst_ip = msg->content.in_info.in_dst_ip;
1084         in_cache_entry *entry;
1085 
1086         entry = mpc->in_ops->get(dst_ip, mpc);
1087         if (entry == NULL) {
1088                 entry = mpc->in_ops->add_entry(dst_ip, mpc);
1089                 entry->entry_state = INGRESS_RESOLVING;
1090                 msg->type = SND_MPOA_RES_RQST;
1091                 msg->content.in_info = entry->ctrl_info;
1092                 msg_to_mpoad(msg, mpc);
1093                 do_gettimeofday(&(entry->reply_wait));
1094                 mpc->in_ops->put(entry);
1095                 return;
1096         }
1097 
1098         if (entry->entry_state == INGRESS_INVALID) {
1099                 entry->entry_state = INGRESS_RESOLVING;
1100                 msg->type = SND_MPOA_RES_RQST;
1101                 msg->content.in_info = entry->ctrl_info;
1102                 msg_to_mpoad(msg, mpc);
1103                 do_gettimeofday(&(entry->reply_wait));
1104                 mpc->in_ops->put(entry);
1105                 return;
1106         }
1107 
1108         pr_info("(%s) entry already in resolving state\n",
1109                 (mpc->dev) ? mpc->dev->name : "<unknown>");
1110         mpc->in_ops->put(entry);
1111 }
1112 
1113 /*
1114  * Things get complicated because we have to check if there's an egress
1115  * shortcut with suitable traffic parameters we could use.
1116  */
1117 static void check_qos_and_open_shortcut(struct k_message *msg,
1118                                         struct mpoa_client *client,
1119                                         in_cache_entry *entry)
1120 {
1121         __be32 dst_ip = msg->content.in_info.in_dst_ip;
1122         struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1123         eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1124 
1125         if (eg_entry && eg_entry->shortcut) {
1126                 if (eg_entry->shortcut->qos.txtp.traffic_class &
1127                     msg->qos.txtp.traffic_class &
1128                     (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)) {
1129                         if (eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1130                                 entry->shortcut = eg_entry->shortcut;
1131                         else if (eg_entry->shortcut->qos.txtp.max_pcr > 0)
1132                                 entry->shortcut = eg_entry->shortcut;
1133                 }
1134                 if (entry->shortcut) {
1135                         dprintk("(%s) using egress SVC to reach %pI4\n",
1136                                 client->dev->name, &dst_ip);
1137                         client->eg_ops->put(eg_entry);
1138                         return;
1139                 }
1140         }
1141         if (eg_entry != NULL)
1142                 client->eg_ops->put(eg_entry);
1143 
1144         /* No luck in the egress cache we must open an ingress SVC */
1145         msg->type = OPEN_INGRESS_SVC;
1146         if (qos &&
1147             (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class)) {
1148                 msg->qos = qos->qos;
1149                 pr_info("(%s) trying to get a CBR shortcut\n",
1150                         client->dev->name);
1151         } else
1152                 memset(&msg->qos, 0, sizeof(struct atm_qos));
1153         msg_to_mpoad(msg, client);
1154 }
1155 
1156 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1157 {
1158         __be32 dst_ip = msg->content.in_info.in_dst_ip;
1159         in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1160 
1161         dprintk("(%s) ip %pI4\n",
1162                 mpc->dev->name, &dst_ip);
1163         ddprintk("(%s) entry = %p",
1164                  mpc->dev->name, entry);
1165         if (entry == NULL) {
1166                 pr_info("(%s) ARGH, received res. reply for an entry that doesn't exist.\n",
1167                         mpc->dev->name);
1168                 return;
1169         }
1170         ddprintk_cont(" entry_state = %d ", entry->entry_state);
1171 
1172         if (entry->entry_state == INGRESS_RESOLVED) {
1173                 pr_info("(%s) RESOLVED entry!\n", mpc->dev->name);
1174                 mpc->in_ops->put(entry);
1175                 return;
1176         }
1177 
1178         entry->ctrl_info = msg->content.in_info;
1179         do_gettimeofday(&(entry->tv));
1180         do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1181         entry->refresh_time = 0;
1182         ddprintk_cont("entry->shortcut = %p\n", entry->shortcut);
1183 
1184         if (entry->entry_state == INGRESS_RESOLVING &&
1185             entry->shortcut != NULL) {
1186                 entry->entry_state = INGRESS_RESOLVED;
1187                 mpc->in_ops->put(entry);
1188                 return; /* Shortcut already open... */
1189         }
1190 
1191         if (entry->shortcut != NULL) {
1192                 pr_info("(%s) entry->shortcut != NULL, impossible!\n",
1193                         mpc->dev->name);
1194                 mpc->in_ops->put(entry);
1195                 return;
1196         }
1197 
1198         check_qos_and_open_shortcut(msg, mpc, entry);
1199         entry->entry_state = INGRESS_RESOLVED;
1200         mpc->in_ops->put(entry);
1201 
1202         return;
1203 
1204 }
1205 
1206 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1207 {
1208         __be32 dst_ip = msg->content.in_info.in_dst_ip;
1209         __be32 mask = msg->ip_mask;
1210         in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1211 
1212         if (entry == NULL) {
1213                 pr_info("(%s) purge for a non-existing entry, ip = %pI4\n",
1214                         mpc->dev->name, &dst_ip);
1215                 return;
1216         }
1217 
1218         do {
1219                 dprintk("(%s) removing an ingress entry, ip = %pI4\n",
1220                         mpc->dev->name, &dst_ip);
1221                 write_lock_bh(&mpc->ingress_lock);
1222                 mpc->in_ops->remove_entry(entry, mpc);
1223                 write_unlock_bh(&mpc->ingress_lock);
1224                 mpc->in_ops->put(entry);
1225                 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1226         } while (entry != NULL);
1227 }
1228 
1229 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1230 {
1231         __be32 cache_id = msg->content.eg_info.cache_id;
1232         eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1233 
1234         if (entry == NULL) {
1235                 dprintk("(%s) purge for a non-existing entry\n",
1236                         mpc->dev->name);
1237                 return;
1238         }
1239 
1240         write_lock_irq(&mpc->egress_lock);
1241         mpc->eg_ops->remove_entry(entry, mpc);
1242         write_unlock_irq(&mpc->egress_lock);
1243 
1244         mpc->eg_ops->put(entry);
1245 }
1246 
1247 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
1248 {
1249         struct sock *sk;
1250         struct k_message *purge_msg;
1251         struct sk_buff *skb;
1252 
1253         dprintk("entering\n");
1254         if (vcc == NULL) {
1255                 pr_info("vcc == NULL\n");
1256                 return;
1257         }
1258 
1259         skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
1260         if (skb == NULL) {
1261                 pr_info("out of memory\n");
1262                 return;
1263         }
1264 
1265         skb_put(skb, sizeof(struct k_message));
1266         memset(skb->data, 0, sizeof(struct k_message));
1267         purge_msg = (struct k_message *)skb->data;
1268         purge_msg->type = DATA_PLANE_PURGE;
1269         if (entry != NULL)
1270                 purge_msg->content.eg_info = entry->ctrl_info;
1271 
1272         atm_force_charge(vcc, skb->truesize);
1273 
1274         sk = sk_atm(vcc);
1275         skb_queue_tail(&sk->sk_receive_queue, skb);
1276         sk->sk_data_ready(sk);
1277         dprintk("exiting\n");
1278 }
1279 
1280 /*
1281  * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1282  * of the egress shortcuts we have.
1283  */
1284 static void mps_death(struct k_message *msg, struct mpoa_client *mpc)
1285 {
1286         eg_cache_entry *entry;
1287 
1288         dprintk("(%s)\n", mpc->dev->name);
1289 
1290         if (memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)) {
1291                 pr_info("(%s) wrong MPS\n", mpc->dev->name);
1292                 return;
1293         }
1294 
1295         /* FIXME: This knows too much of the cache structure */
1296         read_lock_irq(&mpc->egress_lock);
1297         entry = mpc->eg_cache;
1298         while (entry != NULL) {
1299                 purge_egress_shortcut(entry->shortcut, entry);
1300                 entry = entry->next;
1301         }
1302         read_unlock_irq(&mpc->egress_lock);
1303 
1304         mpc->in_ops->destroy_cache(mpc);
1305         mpc->eg_ops->destroy_cache(mpc);
1306 }
1307 
1308 static void MPOA_cache_impos_rcvd(struct k_message *msg,
1309                                   struct mpoa_client *mpc)
1310 {
1311         uint16_t holding_time;
1312         eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1313 
1314         holding_time = msg->content.eg_info.holding_time;
1315         dprintk("(%s) entry = %p, holding_time = %u\n",
1316                 mpc->dev->name, entry, holding_time);
1317         if (entry == NULL && holding_time) {
1318                 entry = mpc->eg_ops->add_entry(msg, mpc);
1319                 mpc->eg_ops->put(entry);
1320                 return;
1321         }
1322         if (holding_time) {
1323                 mpc->eg_ops->update(entry, holding_time);
1324                 return;
1325         }
1326 
1327         write_lock_irq(&mpc->egress_lock);
1328         mpc->eg_ops->remove_entry(entry, mpc);
1329         write_unlock_irq(&mpc->egress_lock);
1330 
1331         mpc->eg_ops->put(entry);
1332 }
1333 
1334 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg,
1335                                    struct mpoa_client *mpc)
1336 {
1337         struct lec_priv *priv;
1338         int i, retval ;
1339 
1340         uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1341 
1342         tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type  */
1343         tlv[4] = 1 + 1 + ATM_ESA_LEN;  /* length                           */
1344         tlv[5] = 0x02;                 /* MPOA client                      */
1345         tlv[6] = 0x00;                 /* number of MPS MAC addresses      */
1346 
1347         memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1348         memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1349 
1350         dprintk("(%s) setting MPC ctrl ATM address to",
1351                 mpc->dev ? mpc->dev->name : "<unknown>");
1352         for (i = 7; i < sizeof(tlv); i++)
1353                 dprintk_cont(" %02x", tlv[i]);
1354         dprintk_cont("\n");
1355 
1356         if (mpc->dev) {
1357                 priv = netdev_priv(mpc->dev);
1358                 retval = priv->lane2_ops->associate_req(mpc->dev,
1359                                                         mpc->dev->dev_addr,
1360                                                         tlv, sizeof(tlv));
1361                 if (retval == 0)
1362                         pr_info("(%s) MPOA device type TLV association failed\n",
1363                                 mpc->dev->name);
1364                 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1365                 if (retval < 0)
1366                         pr_info("(%s) targetless LE_ARP request failed\n",
1367                                 mpc->dev->name);
1368         }
1369 }
1370 
1371 static void set_mps_mac_addr_rcvd(struct k_message *msg,
1372                                   struct mpoa_client *client)
1373 {
1374 
1375         if (client->number_of_mps_macs)
1376                 kfree(client->mps_macs);
1377         client->number_of_mps_macs = 0;
1378         client->mps_macs = kmemdup(msg->MPS_ctrl, ETH_ALEN, GFP_KERNEL);
1379         if (client->mps_macs == NULL) {
1380                 pr_info("out of memory\n");
1381                 return;
1382         }
1383         client->number_of_mps_macs = 1;
1384 }
1385 
1386 /*
1387  * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1388  */
1389 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1390 {
1391 
1392         eg_cache_entry *entry;
1393         msg->type = SND_EGRESS_PURGE;
1394 
1395 
1396         /* FIXME: This knows too much of the cache structure */
1397         read_lock_irq(&mpc->egress_lock);
1398         entry = mpc->eg_cache;
1399         while (entry != NULL) {
1400                 msg->content.eg_info = entry->ctrl_info;
1401                 dprintk("cache_id %u\n", entry->ctrl_info.cache_id);
1402                 msg_to_mpoad(msg, mpc);
1403                 entry = entry->next;
1404         }
1405         read_unlock_irq(&mpc->egress_lock);
1406 
1407         msg->type = action;
1408         msg_to_mpoad(msg, mpc);
1409 }
1410 
1411 static void mpc_timer_refresh(void)
1412 {
1413         mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1414         mpc_timer.data = mpc_timer.expires;
1415         mpc_timer.function = mpc_cache_check;
1416         add_timer(&mpc_timer);
1417 }
1418 
1419 static void mpc_cache_check(unsigned long checking_time)
1420 {
1421         struct mpoa_client *mpc = mpcs;
1422         static unsigned long previous_resolving_check_time;
1423         static unsigned long previous_refresh_time;
1424 
1425         while (mpc != NULL) {
1426                 mpc->in_ops->clear_count(mpc);
1427                 mpc->eg_ops->clear_expired(mpc);
1428                 if (checking_time - previous_resolving_check_time >
1429                     mpc->parameters.mpc_p4 * HZ) {
1430                         mpc->in_ops->check_resolving(mpc);
1431                         previous_resolving_check_time = checking_time;
1432                 }
1433                 if (checking_time - previous_refresh_time >
1434                     mpc->parameters.mpc_p5 * HZ) {
1435                         mpc->in_ops->refresh(mpc);
1436                         previous_refresh_time = checking_time;
1437                 }
1438                 mpc = mpc->next;
1439         }
1440         mpc_timer_refresh();
1441 }
1442 
1443 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd,
1444                           unsigned long arg)
1445 {
1446         int err = 0;
1447         struct atm_vcc *vcc = ATM_SD(sock);
1448 
1449         if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1450                 return -ENOIOCTLCMD;
1451 
1452         if (!capable(CAP_NET_ADMIN))
1453                 return -EPERM;
1454 
1455         switch (cmd) {
1456         case ATMMPC_CTRL:
1457                 err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1458                 if (err >= 0)
1459                         sock->state = SS_CONNECTED;
1460                 break;
1461         case ATMMPC_DATA:
1462                 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1463                 break;
1464         default:
1465                 break;
1466         }
1467         return err;
1468 }
1469 
1470 static struct atm_ioctl atm_ioctl_ops = {
1471         .owner  = THIS_MODULE,
1472         .ioctl  = atm_mpoa_ioctl,
1473 };
1474 
1475 static __init int atm_mpoa_init(void)
1476 {
1477         register_atm_ioctl(&atm_ioctl_ops);
1478 
1479         if (mpc_proc_init() != 0)
1480                 pr_info("failed to initialize /proc/mpoa\n");
1481 
1482         pr_info("mpc.c: initialized\n");
1483 
1484         return 0;
1485 }
1486 
1487 static void __exit atm_mpoa_cleanup(void)
1488 {
1489         struct mpoa_client *mpc, *tmp;
1490         struct atm_mpoa_qos *qos, *nextqos;
1491         struct lec_priv *priv;
1492 
1493         mpc_proc_clean();
1494 
1495         del_timer_sync(&mpc_timer);
1496         unregister_netdevice_notifier(&mpoa_notifier);
1497         deregister_atm_ioctl(&atm_ioctl_ops);
1498 
1499         mpc = mpcs;
1500         mpcs = NULL;
1501         while (mpc != NULL) {
1502                 tmp = mpc->next;
1503                 if (mpc->dev != NULL) {
1504                         stop_mpc(mpc);
1505                         priv = netdev_priv(mpc->dev);
1506                         if (priv->lane2_ops != NULL)
1507                                 priv->lane2_ops->associate_indicator = NULL;
1508                 }
1509                 ddprintk("about to clear caches\n");
1510                 mpc->in_ops->destroy_cache(mpc);
1511                 mpc->eg_ops->destroy_cache(mpc);
1512                 ddprintk("caches cleared\n");
1513                 kfree(mpc->mps_macs);
1514                 memset(mpc, 0, sizeof(struct mpoa_client));
1515                 ddprintk("about to kfree %p\n", mpc);
1516                 kfree(mpc);
1517                 ddprintk("next mpc is at %p\n", tmp);
1518                 mpc = tmp;
1519         }
1520 
1521         qos = qos_head;
1522         qos_head = NULL;
1523         while (qos != NULL) {
1524                 nextqos = qos->next;
1525                 dprintk("freeing qos entry %p\n", qos);
1526                 kfree(qos);
1527                 qos = nextqos;
1528         }
1529 }
1530 
1531 module_init(atm_mpoa_init);
1532 module_exit(atm_mpoa_cleanup);
1533 
1534 MODULE_LICENSE("GPL");
1535 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp