net/atm/mpc.c

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This source file includes following definitions.
find_mpc_by_itfnum
find_mpc_by_vcc
find_mpc_by_lec
atm_mpoa_add_qos
atm_mpoa_search_qos
atm_mpoa_delete_qos
atm_mpoa_disp_qos
find_lec_by_itfnum
alloc_mpc
start_mpc
stop_mpc
mpoa_device_type_string
lane2_assoc_ind
copy_macs
send_via_shortcut
mpc_send_packet
atm_mpoa_vcc_attach
mpc_vcc_close
mpc_push
atm_mpoa_mpoad_attach
send_set_mps_ctrl_addr
mpoad_close
msg_from_mpoad
msg_to_mpoad
mpoa_event_listener
MPOA_trigger_rcvd
check_qos_and_open_shortcut
MPOA_res_reply_rcvd
ingress_purge_rcvd
egress_purge_rcvd
purge_egress_shortcut
mps_death
MPOA_cache_impos_rcvd
set_mpc_ctrl_addr_rcvd
set_mps_mac_addr_rcvd
clean_up
mpc_timer_refresh
mpc_cache_check
atm_mpoa_ioctl
atm_mpoa_init
atm_mpoa_cleanup
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
   3 
   4 #include <linux/kernel.h>
   5 #include <linux/string.h>
   6 #include <linux/slab.h>
   7 #include <linux/timer.h>
   8 #include <linux/init.h>
   9 #include <linux/bitops.h>
  10 #include <linux/capability.h>
  11 #include <linux/seq_file.h>
  12 
  13 /* We are an ethernet device */
  14 #include <linux/if_ether.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/etherdevice.h>
  17 #include <net/sock.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/ip.h>
  20 #include <linux/uaccess.h>
  21 #include <asm/byteorder.h>
  22 #include <net/checksum.h>   /* for ip_fast_csum() */
  23 #include <net/arp.h>
  24 #include <net/dst.h>
  25 #include <linux/proc_fs.h>
  26 
  27 /* And atm device */
  28 #include <linux/atmdev.h>
  29 #include <linux/atmlec.h>
  30 #include <linux/atmmpc.h>
  31 /* Modular too */
  32 #include <linux/module.h>
  33 
  34 #include "lec.h"
  35 #include "mpc.h"
  36 #include "resources.h"
  37 
  38 /*
  39  * mpc.c: Implementation of MPOA client kernel part
  40  */
  41 
  42 #if 0
  43 #define dprintk(format, args...) \
  44         printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args)
  45 #define dprintk_cont(format, args...) printk(KERN_CONT format, ##args)
  46 #else
  47 #define dprintk(format, args...)                                        \
  48         do { if (0)                                                     \
  49                 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\
  50         } while (0)
  51 #define dprintk_cont(format, args...)                   \
  52         do { if (0) printk(KERN_CONT format, ##args); } while (0)
  53 #endif
  54 
  55 #if 0
  56 #define ddprintk(format, args...) \
  57         printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args)
  58 #define ddprintk_cont(format, args...) printk(KERN_CONT format, ##args)
  59 #else
  60 #define ddprintk(format, args...)                                       \
  61         do { if (0)                                                     \
  62                 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\
  63         } while (0)
  64 #define ddprintk_cont(format, args...)                  \
  65         do { if (0) printk(KERN_CONT format, ##args); } while (0)
  66 #endif
  67 
  68 /* mpc_daemon -> kernel */
  69 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc);
  70 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
  71 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
  72 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
  73 static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
  74 static void clean_up(struct k_message *msg, struct mpoa_client *mpc,
  75                      int action);
  76 static void MPOA_cache_impos_rcvd(struct k_message *msg,
  77                                   struct mpoa_client *mpc);
  78 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg,
  79                                    struct mpoa_client *mpc);
  80 static void set_mps_mac_addr_rcvd(struct k_message *mesg,
  81                                   struct mpoa_client *mpc);
  82 
  83 static const uint8_t *copy_macs(struct mpoa_client *mpc,
  84                                 const uint8_t *router_mac,
  85                                 const uint8_t *tlvs, uint8_t mps_macs,
  86                                 uint8_t device_type);
  87 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
  88 
  89 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc);
  90 static void mpoad_close(struct atm_vcc *vcc);
  91 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
  92 
  93 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
  94 static netdev_tx_t mpc_send_packet(struct sk_buff *skb,
  95                                    struct net_device *dev);
  96 static int mpoa_event_listener(struct notifier_block *mpoa_notifier,
  97                                unsigned long event, void *dev);
  98 static void mpc_timer_refresh(void);
  99 static void mpc_cache_check(struct timer_list *unused);
 100 
 101 static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
 102         0xaa, 0xaa, 0x03,
 103         {0x00, 0x00, 0x5e},
 104         {0x00, 0x03}         /* For MPOA control PDUs */
 105 };
 106 static struct llc_snap_hdr llc_snap_mpoa_data = {
 107         0xaa, 0xaa, 0x03,
 108         {0x00, 0x00, 0x00},
 109         {0x08, 0x00}         /* This is for IP PDUs only */
 110 };
 111 static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
 112         0xaa, 0xaa, 0x03,
 113         {0x00, 0x00, 0x00},
 114         {0x88, 0x4c}         /* This is for tagged data PDUs */
 115 };
 116 
 117 static struct notifier_block mpoa_notifier = {
 118         mpoa_event_listener,
 119         NULL,
 120         0
 121 };
 122 
 123 struct mpoa_client *mpcs = NULL; /* FIXME */
 124 static struct atm_mpoa_qos *qos_head = NULL;
 125 static DEFINE_TIMER(mpc_timer, mpc_cache_check);
 126 
 127 
 128 static struct mpoa_client *find_mpc_by_itfnum(int itf)
 129 {
 130         struct mpoa_client *mpc;
 131 
 132         mpc = mpcs;  /* our global linked list */
 133         while (mpc != NULL) {
 134                 if (mpc->dev_num == itf)
 135                         return mpc;
 136                 mpc = mpc->next;
 137         }
 138 
 139         return NULL;   /* not found */
 140 }
 141 
 142 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
 143 {
 144         struct mpoa_client *mpc;
 145 
 146         mpc = mpcs;  /* our global linked list */
 147         while (mpc != NULL) {
 148                 if (mpc->mpoad_vcc == vcc)
 149                         return mpc;
 150                 mpc = mpc->next;
 151         }
 152 
 153         return NULL;   /* not found */
 154 }
 155 
 156 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
 157 {
 158         struct mpoa_client *mpc;
 159 
 160         mpc = mpcs;  /* our global linked list */
 161         while (mpc != NULL) {
 162                 if (mpc->dev == dev)
 163                         return mpc;
 164                 mpc = mpc->next;
 165         }
 166 
 167         return NULL;   /* not found */
 168 }
 169 
 170 /*
 171  * Functions for managing QoS list
 172  */
 173 
 174 /*
 175  * Overwrites the old entry or makes a new one.
 176  */
 177 struct atm_mpoa_qos *atm_mpoa_add_qos(__be32 dst_ip, struct atm_qos *qos)
 178 {
 179         struct atm_mpoa_qos *entry;
 180 
 181         entry = atm_mpoa_search_qos(dst_ip);
 182         if (entry != NULL) {
 183                 entry->qos = *qos;
 184                 return entry;
 185         }
 186 
 187         entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
 188         if (entry == NULL) {
 189                 pr_info("mpoa: out of memory\n");
 190                 return entry;
 191         }
 192 
 193         entry->ipaddr = dst_ip;
 194         entry->qos = *qos;
 195 
 196         entry->next = qos_head;
 197         qos_head = entry;
 198 
 199         return entry;
 200 }
 201 
 202 struct atm_mpoa_qos *atm_mpoa_search_qos(__be32 dst_ip)
 203 {
 204         struct atm_mpoa_qos *qos;
 205 
 206         qos = qos_head;
 207         while (qos) {
 208                 if (qos->ipaddr == dst_ip)
 209                         break;
 210                 qos = qos->next;
 211         }
 212 
 213         return qos;
 214 }
 215 
 216 /*
 217  * Returns 0 for failure
 218  */
 219 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
 220 {
 221         struct atm_mpoa_qos *curr;
 222 
 223         if (entry == NULL)
 224                 return 0;
 225         if (entry == qos_head) {
 226                 qos_head = qos_head->next;
 227                 kfree(entry);
 228                 return 1;
 229         }
 230 
 231         curr = qos_head;
 232         while (curr != NULL) {
 233                 if (curr->next == entry) {
 234                         curr->next = entry->next;
 235                         kfree(entry);
 236                         return 1;
 237                 }
 238                 curr = curr->next;
 239         }
 240 
 241         return 0;
 242 }
 243 
 244 /* this is buggered - we need locking for qos_head */
 245 void atm_mpoa_disp_qos(struct seq_file *m)
 246 {
 247         struct atm_mpoa_qos *qos;
 248 
 249         qos = qos_head;
 250         seq_printf(m, "QoS entries for shortcuts:\n");
 251         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");
 252 
 253         while (qos != NULL) {
 254                 seq_printf(m, "%pI4\n     %-7d %-7d %-7d %-7d %-7d\n     %-7d %-7d %-7d %-7d %-7d\n",
 255                            &qos->ipaddr,
 256                            qos->qos.txtp.max_pcr,
 257                            qos->qos.txtp.pcr,
 258                            qos->qos.txtp.min_pcr,
 259                            qos->qos.txtp.max_cdv,
 260                            qos->qos.txtp.max_sdu,
 261                            qos->qos.rxtp.max_pcr,
 262                            qos->qos.rxtp.pcr,
 263                            qos->qos.rxtp.min_pcr,
 264                            qos->qos.rxtp.max_cdv,
 265                            qos->qos.rxtp.max_sdu);
 266                 qos = qos->next;
 267         }
 268 }
 269 
 270 static struct net_device *find_lec_by_itfnum(int itf)
 271 {
 272         struct net_device *dev;
 273         char name[IFNAMSIZ];
 274 
 275         sprintf(name, "lec%d", itf);
 276         dev = dev_get_by_name(&init_net, name);
 277 
 278         return dev;
 279 }
 280 
 281 static struct mpoa_client *alloc_mpc(void)
 282 {
 283         struct mpoa_client *mpc;
 284 
 285         mpc = kzalloc(sizeof(struct mpoa_client), GFP_KERNEL);
 286         if (mpc == NULL)
 287                 return NULL;
 288         rwlock_init(&mpc->ingress_lock);
 289         rwlock_init(&mpc->egress_lock);
 290         mpc->next = mpcs;
 291         atm_mpoa_init_cache(mpc);
 292 
 293         mpc->parameters.mpc_p1 = MPC_P1;
 294         mpc->parameters.mpc_p2 = MPC_P2;
 295         memset(mpc->parameters.mpc_p3, 0, sizeof(mpc->parameters.mpc_p3));
 296         mpc->parameters.mpc_p4 = MPC_P4;
 297         mpc->parameters.mpc_p5 = MPC_P5;
 298         mpc->parameters.mpc_p6 = MPC_P6;
 299 
 300         mpcs = mpc;
 301 
 302         return mpc;
 303 }
 304 
 305 /*
 306  *
 307  * start_mpc() puts the MPC on line. All the packets destined
 308  * to the lec underneath us are now being monitored and
 309  * shortcuts will be established.
 310  *
 311  */
 312 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
 313 {
 314 
 315         dprintk("(%s)\n", mpc->dev->name);
 316         if (!dev->netdev_ops)
 317                 pr_info("(%s) not starting\n", dev->name);
 318         else {
 319                 mpc->old_ops = dev->netdev_ops;
 320                 mpc->new_ops = *mpc->old_ops;
 321                 mpc->new_ops.ndo_start_xmit = mpc_send_packet;
 322                 dev->netdev_ops = &mpc->new_ops;
 323         }
 324 }
 325 
 326 static void stop_mpc(struct mpoa_client *mpc)
 327 {
 328         struct net_device *dev = mpc->dev;
 329         dprintk("(%s)", mpc->dev->name);
 330 
 331         /* Lets not nullify lec device's dev->hard_start_xmit */
 332         if (dev->netdev_ops != &mpc->new_ops) {
 333                 dprintk_cont(" mpc already stopped, not fatal\n");
 334                 return;
 335         }
 336         dprintk_cont("\n");
 337 
 338         dev->netdev_ops = mpc->old_ops;
 339         mpc->old_ops = NULL;
 340 
 341         /* close_shortcuts(mpc);    ??? FIXME */
 342 }
 343 
 344 static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
 345 
 346 static const char *mpoa_device_type_string(char type)
 347 {
 348         switch (type) {
 349         case NON_MPOA:
 350                 return "non-MPOA device";
 351         case MPS:
 352                 return "MPS";
 353         case MPC:
 354                 return "MPC";
 355         case MPS_AND_MPC:
 356                 return "both MPS and MPC";
 357         }
 358 
 359         return "unspecified (non-MPOA) device";
 360 }
 361 
 362 /*
 363  * lec device calls this via its netdev_priv(dev)->lane2_ops
 364  * ->associate_indicator() when it sees a TLV in LE_ARP packet.
 365  * We fill in the pointer above when we see a LANE2 lec initializing
 366  * See LANE2 spec 3.1.5
 367  *
 368  * Quite a big and ugly function but when you look at it
 369  * all it does is to try to locate and parse MPOA Device
 370  * Type TLV.
 371  * We give our lec a pointer to this function and when the
 372  * lec sees a TLV it uses the pointer to call this function.
 373  *
 374  */
 375 static void lane2_assoc_ind(struct net_device *dev, const u8 *mac_addr,
 376                             const u8 *tlvs, u32 sizeoftlvs)
 377 {
 378         uint32_t type;
 379         uint8_t length, mpoa_device_type, number_of_mps_macs;
 380         const uint8_t *end_of_tlvs;
 381         struct mpoa_client *mpc;
 382 
 383         mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
 384         dprintk("(%s) received TLV(s), ", dev->name);
 385         dprintk("total length of all TLVs %d\n", sizeoftlvs);
 386         mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
 387         if (mpc == NULL) {
 388                 pr_info("(%s) no mpc\n", dev->name);
 389                 return;
 390         }
 391         end_of_tlvs = tlvs + sizeoftlvs;
 392         while (end_of_tlvs - tlvs >= 5) {
 393                 type = ((tlvs[0] << 24) | (tlvs[1] << 16) |
 394                         (tlvs[2] << 8) | tlvs[3]);
 395                 length = tlvs[4];
 396                 tlvs += 5;
 397                 dprintk("    type 0x%x length %02x\n", type, length);
 398                 if (tlvs + length > end_of_tlvs) {
 399                         pr_info("TLV value extends past its buffer, aborting parse\n");
 400                         return;
 401                 }
 402 
 403                 if (type == 0) {
 404                         pr_info("mpoa: (%s) TLV type was 0, returning\n",
 405                                 dev->name);
 406                         return;
 407                 }
 408 
 409                 if (type != TLV_MPOA_DEVICE_TYPE) {
 410                         tlvs += length;
 411                         continue;  /* skip other TLVs */
 412                 }
 413                 mpoa_device_type = *tlvs++;
 414                 number_of_mps_macs = *tlvs++;
 415                 dprintk("(%s) MPOA device type '%s', ",
 416                         dev->name, mpoa_device_type_string(mpoa_device_type));
 417                 if (mpoa_device_type == MPS_AND_MPC &&
 418                     length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
 419                         pr_info("(%s) short MPOA Device Type TLV\n",
 420                                 dev->name);
 421                         continue;
 422                 }
 423                 if ((mpoa_device_type == MPS || mpoa_device_type == MPC) &&
 424                     length < 22 + number_of_mps_macs*ETH_ALEN) {
 425                         pr_info("(%s) short MPOA Device Type TLV\n", dev->name);
 426                         continue;
 427                 }
 428                 if (mpoa_device_type != MPS &&
 429                     mpoa_device_type != MPS_AND_MPC) {
 430                         dprintk("ignoring non-MPS device ");
 431                         if (mpoa_device_type == MPC)
 432                                 tlvs += 20;
 433                         continue;  /* we are only interested in MPSs */
 434                 }
 435                 if (number_of_mps_macs == 0 &&
 436                     mpoa_device_type == MPS_AND_MPC) {
 437                         pr_info("(%s) MPS_AND_MPC has zero MACs\n", dev->name);
 438                         continue;  /* someone should read the spec */
 439                 }
 440                 dprintk_cont("this MPS has %d MAC addresses\n",
 441                              number_of_mps_macs);
 442 
 443                 /*
 444                  * ok, now we can go and tell our daemon
 445                  * the control address of MPS
 446                  */
 447                 send_set_mps_ctrl_addr(tlvs, mpc);
 448 
 449                 tlvs = copy_macs(mpc, mac_addr, tlvs,
 450                                  number_of_mps_macs, mpoa_device_type);
 451                 if (tlvs == NULL)
 452                         return;
 453         }
 454         if (end_of_tlvs - tlvs != 0)
 455                 pr_info("(%s) ignoring %zd bytes of trailing TLV garbage\n",
 456                         dev->name, end_of_tlvs - tlvs);
 457 }
 458 
 459 /*
 460  * Store at least advertizing router's MAC address
 461  * plus the possible MAC address(es) to mpc->mps_macs.
 462  * For a freshly allocated MPOA client mpc->mps_macs == 0.
 463  */
 464 static const uint8_t *copy_macs(struct mpoa_client *mpc,
 465                                 const uint8_t *router_mac,
 466                                 const uint8_t *tlvs, uint8_t mps_macs,
 467                                 uint8_t device_type)
 468 {
 469         int num_macs;
 470         num_macs = (mps_macs > 1) ? mps_macs : 1;
 471 
 472         if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
 473                 if (mpc->number_of_mps_macs != 0)
 474                         kfree(mpc->mps_macs);
 475                 mpc->number_of_mps_macs = 0;
 476                 mpc->mps_macs = kmalloc_array(ETH_ALEN, num_macs, GFP_KERNEL);
 477                 if (mpc->mps_macs == NULL) {
 478                         pr_info("(%s) out of mem\n", mpc->dev->name);
 479                         return NULL;
 480                 }
 481         }
 482         ether_addr_copy(mpc->mps_macs, router_mac);
 483         tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
 484         if (mps_macs > 0)
 485                 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
 486         tlvs += mps_macs*ETH_ALEN;
 487         mpc->number_of_mps_macs = num_macs;
 488 
 489         return tlvs;
 490 }
 491 
 492 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
 493 {
 494         in_cache_entry *entry;
 495         struct iphdr *iph;
 496         char *buff;
 497         __be32 ipaddr = 0;
 498 
 499         static struct {
 500                 struct llc_snap_hdr hdr;
 501                 __be32 tag;
 502         } tagged_llc_snap_hdr = {
 503                 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
 504                 0
 505         };
 506 
 507         buff = skb->data + mpc->dev->hard_header_len;
 508         iph = (struct iphdr *)buff;
 509         ipaddr = iph->daddr;
 510 
 511         ddprintk("(%s) ipaddr 0x%x\n",
 512                  mpc->dev->name, ipaddr);
 513 
 514         entry = mpc->in_ops->get(ipaddr, mpc);
 515         if (entry == NULL) {
 516                 entry = mpc->in_ops->add_entry(ipaddr, mpc);
 517                 if (entry != NULL)
 518                         mpc->in_ops->put(entry);
 519                 return 1;
 520         }
 521         /* threshold not exceeded or VCC not ready */
 522         if (mpc->in_ops->cache_hit(entry, mpc) != OPEN) {
 523                 ddprintk("(%s) cache_hit: returns != OPEN\n",
 524                          mpc->dev->name);
 525                 mpc->in_ops->put(entry);
 526                 return 1;
 527         }
 528 
 529         ddprintk("(%s) using shortcut\n",
 530                  mpc->dev->name);
 531         /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
 532         if (iph->ttl <= 1) {
 533                 ddprintk("(%s) IP ttl = %u, using LANE\n",
 534                          mpc->dev->name, iph->ttl);
 535                 mpc->in_ops->put(entry);
 536                 return 1;
 537         }
 538         iph->ttl--;
 539         iph->check = 0;
 540         iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
 541 
 542         if (entry->ctrl_info.tag != 0) {
 543                 ddprintk("(%s) adding tag 0x%x\n",
 544                          mpc->dev->name, entry->ctrl_info.tag);
 545                 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
 546                 skb_pull(skb, ETH_HLEN);        /* get rid of Eth header */
 547                 skb_push(skb, sizeof(tagged_llc_snap_hdr));
 548                                                 /* add LLC/SNAP header   */
 549                 skb_copy_to_linear_data(skb, &tagged_llc_snap_hdr,
 550                                         sizeof(tagged_llc_snap_hdr));
 551         } else {
 552                 skb_pull(skb, ETH_HLEN);        /* get rid of Eth header */
 553                 skb_push(skb, sizeof(struct llc_snap_hdr));
 554                                                 /* add LLC/SNAP header + tag  */
 555                 skb_copy_to_linear_data(skb, &llc_snap_mpoa_data,
 556                                         sizeof(struct llc_snap_hdr));
 557         }
 558 
 559         atm_account_tx(entry->shortcut, skb);
 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 const 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                 mpc_timer_refresh();
 803 
 804                 /* This lets us now how our LECs are doing */
 805                 err = register_netdevice_notifier(&mpoa_notifier);
 806                 if (err < 0) {
 807                         del_timer(&mpc_timer);
 808                         return err;
 809                 }
 810         }
 811 
 812         mpc = find_mpc_by_itfnum(arg);
 813         if (mpc == NULL) {
 814                 dprintk("allocating new mpc for itf %d\n", arg);
 815                 mpc = alloc_mpc();
 816                 if (mpc == NULL)
 817                         return -ENOMEM;
 818                 mpc->dev_num = arg;
 819                 mpc->dev = find_lec_by_itfnum(arg);
 820                                         /* NULL if there was no lec */
 821         }
 822         if (mpc->mpoad_vcc) {
 823                 pr_info("mpoad is already present for itf %d\n", arg);
 824                 return -EADDRINUSE;
 825         }
 826 
 827         if (mpc->dev) { /* check if the lec is LANE2 capable */
 828                 priv = netdev_priv(mpc->dev);
 829                 if (priv->lane_version < 2) {
 830                         dev_put(mpc->dev);
 831                         mpc->dev = NULL;
 832                 } else
 833                         priv->lane2_ops->associate_indicator = lane2_assoc_ind;
 834         }
 835 
 836         mpc->mpoad_vcc = vcc;
 837         vcc->dev = &mpc_dev;
 838         vcc_insert_socket(sk_atm(vcc));
 839         set_bit(ATM_VF_META, &vcc->flags);
 840         set_bit(ATM_VF_READY, &vcc->flags);
 841 
 842         if (mpc->dev) {
 843                 char empty[ATM_ESA_LEN];
 844                 memset(empty, 0, ATM_ESA_LEN);
 845 
 846                 start_mpc(mpc, mpc->dev);
 847                 /* set address if mpcd e.g. gets killed and restarted.
 848                  * If we do not do it now we have to wait for the next LE_ARP
 849                  */
 850                 if (memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0)
 851                         send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
 852         }
 853 
 854         __module_get(THIS_MODULE);
 855         return arg;
 856 }
 857 
 858 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc)
 859 {
 860         struct k_message mesg;
 861 
 862         memcpy(mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
 863 
 864         mesg.type = SET_MPS_CTRL_ADDR;
 865         memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
 866         msg_to_mpoad(&mesg, mpc);
 867 }
 868 
 869 static void mpoad_close(struct atm_vcc *vcc)
 870 {
 871         struct mpoa_client *mpc;
 872         struct sk_buff *skb;
 873 
 874         mpc = find_mpc_by_vcc(vcc);
 875         if (mpc == NULL) {
 876                 pr_info("did not find MPC\n");
 877                 return;
 878         }
 879         if (!mpc->mpoad_vcc) {
 880                 pr_info("close for non-present mpoad\n");
 881                 return;
 882         }
 883 
 884         mpc->mpoad_vcc = NULL;
 885         if (mpc->dev) {
 886                 struct lec_priv *priv = netdev_priv(mpc->dev);
 887                 priv->lane2_ops->associate_indicator = NULL;
 888                 stop_mpc(mpc);
 889                 dev_put(mpc->dev);
 890         }
 891 
 892         mpc->in_ops->destroy_cache(mpc);
 893         mpc->eg_ops->destroy_cache(mpc);
 894 
 895         while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
 896                 atm_return(vcc, skb->truesize);
 897                 kfree_skb(skb);
 898         }
 899 
 900         pr_info("(%s) going down\n",
 901                 (mpc->dev) ? mpc->dev->name : "<unknown>");
 902         module_put(THIS_MODULE);
 903 }
 904 
 905 /*
 906  *
 907  */
 908 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
 909 {
 910 
 911         struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
 912         struct k_message *mesg = (struct k_message *)skb->data;
 913         WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc));
 914 
 915         if (mpc == NULL) {
 916                 pr_info("no mpc found\n");
 917                 return 0;
 918         }
 919         dprintk("(%s)", mpc->dev ? mpc->dev->name : "<unknown>");
 920         switch (mesg->type) {
 921         case MPOA_RES_REPLY_RCVD:
 922                 dprintk_cont("mpoa_res_reply_rcvd\n");
 923                 MPOA_res_reply_rcvd(mesg, mpc);
 924                 break;
 925         case MPOA_TRIGGER_RCVD:
 926                 dprintk_cont("mpoa_trigger_rcvd\n");
 927                 MPOA_trigger_rcvd(mesg, mpc);
 928                 break;
 929         case INGRESS_PURGE_RCVD:
 930                 dprintk_cont("nhrp_purge_rcvd\n");
 931                 ingress_purge_rcvd(mesg, mpc);
 932                 break;
 933         case EGRESS_PURGE_RCVD:
 934                 dprintk_cont("egress_purge_reply_rcvd\n");
 935                 egress_purge_rcvd(mesg, mpc);
 936                 break;
 937         case MPS_DEATH:
 938                 dprintk_cont("mps_death\n");
 939                 mps_death(mesg, mpc);
 940                 break;
 941         case CACHE_IMPOS_RCVD:
 942                 dprintk_cont("cache_impos_rcvd\n");
 943                 MPOA_cache_impos_rcvd(mesg, mpc);
 944                 break;
 945         case SET_MPC_CTRL_ADDR:
 946                 dprintk_cont("set_mpc_ctrl_addr\n");
 947                 set_mpc_ctrl_addr_rcvd(mesg, mpc);
 948                 break;
 949         case SET_MPS_MAC_ADDR:
 950                 dprintk_cont("set_mps_mac_addr\n");
 951                 set_mps_mac_addr_rcvd(mesg, mpc);
 952                 break;
 953         case CLEAN_UP_AND_EXIT:
 954                 dprintk_cont("clean_up_and_exit\n");
 955                 clean_up(mesg, mpc, DIE);
 956                 break;
 957         case RELOAD:
 958                 dprintk_cont("reload\n");
 959                 clean_up(mesg, mpc, RELOAD);
 960                 break;
 961         case SET_MPC_PARAMS:
 962                 dprintk_cont("set_mpc_params\n");
 963                 mpc->parameters = mesg->content.params;
 964                 break;
 965         default:
 966                 dprintk_cont("unknown message %d\n", mesg->type);
 967                 break;
 968         }
 969         kfree_skb(skb);
 970 
 971         return 0;
 972 }
 973 
 974 /* Remember that this function may not do things that sleep */
 975 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
 976 {
 977         struct sk_buff *skb;
 978         struct sock *sk;
 979 
 980         if (mpc == NULL || !mpc->mpoad_vcc) {
 981                 pr_info("mesg %d to a non-existent mpoad\n", mesg->type);
 982                 return -ENXIO;
 983         }
 984 
 985         skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
 986         if (skb == NULL)
 987                 return -ENOMEM;
 988         skb_put(skb, sizeof(struct k_message));
 989         skb_copy_to_linear_data(skb, mesg, sizeof(*mesg));
 990         atm_force_charge(mpc->mpoad_vcc, skb->truesize);
 991 
 992         sk = sk_atm(mpc->mpoad_vcc);
 993         skb_queue_tail(&sk->sk_receive_queue, skb);
 994         sk->sk_data_ready(sk);
 995 
 996         return 0;
 997 }
 998 
 999 static int mpoa_event_listener(struct notifier_block *mpoa_notifier,
1000                                unsigned long event, void *ptr)
1001 {
1002         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1003         struct mpoa_client *mpc;
1004         struct lec_priv *priv;
1005 
1006         if (!net_eq(dev_net(dev), &init_net))
1007                 return NOTIFY_DONE;
1008 
1009         if (strncmp(dev->name, "lec", 3))
1010                 return NOTIFY_DONE; /* we are only interested in lec:s */
1011 
1012         switch (event) {
1013         case NETDEV_REGISTER:       /* a new lec device was allocated */
1014                 priv = netdev_priv(dev);
1015                 if (priv->lane_version < 2)
1016                         break;
1017                 priv->lane2_ops->associate_indicator = lane2_assoc_ind;
1018                 mpc = find_mpc_by_itfnum(priv->itfnum);
1019                 if (mpc == NULL) {
1020                         dprintk("allocating new mpc for %s\n", dev->name);
1021                         mpc = alloc_mpc();
1022                         if (mpc == NULL) {
1023                                 pr_info("no new mpc");
1024                                 break;
1025                         }
1026                 }
1027                 mpc->dev_num = priv->itfnum;
1028                 mpc->dev = dev;
1029                 dev_hold(dev);
1030                 dprintk("(%s) was initialized\n", dev->name);
1031                 break;
1032         case NETDEV_UNREGISTER:
1033                 /* the lec device was deallocated */
1034                 mpc = find_mpc_by_lec(dev);
1035                 if (mpc == NULL)
1036                         break;
1037                 dprintk("device (%s) was deallocated\n", dev->name);
1038                 stop_mpc(mpc);
1039                 dev_put(mpc->dev);
1040                 mpc->dev = NULL;
1041                 break;
1042         case NETDEV_UP:
1043                 /* the dev was ifconfig'ed up */
1044                 mpc = find_mpc_by_lec(dev);
1045                 if (mpc == NULL)
1046                         break;
1047                 if (mpc->mpoad_vcc != NULL)
1048                         start_mpc(mpc, dev);
1049                 break;
1050         case NETDEV_DOWN:
1051                 /* the dev was ifconfig'ed down */
1052                 /* this means that the flow of packets from the
1053                  * upper layer stops
1054                  */
1055                 mpc = find_mpc_by_lec(dev);
1056                 if (mpc == NULL)
1057                         break;
1058                 if (mpc->mpoad_vcc != NULL)
1059                         stop_mpc(mpc);
1060                 break;
1061         case NETDEV_REBOOT:
1062         case NETDEV_CHANGE:
1063         case NETDEV_CHANGEMTU:
1064         case NETDEV_CHANGEADDR:
1065         case NETDEV_GOING_DOWN:
1066                 break;
1067         default:
1068                 break;
1069         }
1070 
1071         return NOTIFY_DONE;
1072 }
1073 
1074 /*
1075  * Functions which are called after a message is received from mpcd.
1076  * Msg is reused on purpose.
1077  */
1078 
1079 
1080 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1081 {
1082         __be32 dst_ip = msg->content.in_info.in_dst_ip;
1083         in_cache_entry *entry;
1084 
1085         entry = mpc->in_ops->get(dst_ip, mpc);
1086         if (entry == NULL) {
1087                 entry = mpc->in_ops->add_entry(dst_ip, mpc);
1088                 entry->entry_state = INGRESS_RESOLVING;
1089                 msg->type = SND_MPOA_RES_RQST;
1090                 msg->content.in_info = entry->ctrl_info;
1091                 msg_to_mpoad(msg, mpc);
1092                 entry->reply_wait = ktime_get_seconds();
1093                 mpc->in_ops->put(entry);
1094                 return;
1095         }
1096 
1097         if (entry->entry_state == INGRESS_INVALID) {
1098                 entry->entry_state = INGRESS_RESOLVING;
1099                 msg->type = SND_MPOA_RES_RQST;
1100                 msg->content.in_info = entry->ctrl_info;
1101                 msg_to_mpoad(msg, mpc);
1102                 entry->reply_wait = ktime_get_seconds();
1103                 mpc->in_ops->put(entry);
1104                 return;
1105         }
1106 
1107         pr_info("(%s) entry already in resolving state\n",
1108                 (mpc->dev) ? mpc->dev->name : "<unknown>");
1109         mpc->in_ops->put(entry);
1110 }
1111 
1112 /*
1113  * Things get complicated because we have to check if there's an egress
1114  * shortcut with suitable traffic parameters we could use.
1115  */
1116 static void check_qos_and_open_shortcut(struct k_message *msg,
1117                                         struct mpoa_client *client,
1118                                         in_cache_entry *entry)
1119 {
1120         __be32 dst_ip = msg->content.in_info.in_dst_ip;
1121         struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1122         eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1123 
1124         if (eg_entry && eg_entry->shortcut) {
1125                 if (eg_entry->shortcut->qos.txtp.traffic_class &
1126                     msg->qos.txtp.traffic_class &
1127                     (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)) {
1128                         if (eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1129                                 entry->shortcut = eg_entry->shortcut;
1130                         else if (eg_entry->shortcut->qos.txtp.max_pcr > 0)
1131                                 entry->shortcut = eg_entry->shortcut;
1132                 }
1133                 if (entry->shortcut) {
1134                         dprintk("(%s) using egress SVC to reach %pI4\n",
1135                                 client->dev->name, &dst_ip);
1136                         client->eg_ops->put(eg_entry);
1137                         return;
1138                 }
1139         }
1140         if (eg_entry != NULL)
1141                 client->eg_ops->put(eg_entry);
1142 
1143         /* No luck in the egress cache we must open an ingress SVC */
1144         msg->type = OPEN_INGRESS_SVC;
1145         if (qos &&
1146             (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class)) {
1147                 msg->qos = qos->qos;
1148                 pr_info("(%s) trying to get a CBR shortcut\n",
1149                         client->dev->name);
1150         } else
1151                 memset(&msg->qos, 0, sizeof(struct atm_qos));
1152         msg_to_mpoad(msg, client);
1153 }
1154 
1155 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1156 {
1157         __be32 dst_ip = msg->content.in_info.in_dst_ip;
1158         in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1159 
1160         dprintk("(%s) ip %pI4\n",
1161                 mpc->dev->name, &dst_ip);
1162         ddprintk("(%s) entry = %p",
1163                  mpc->dev->name, entry);
1164         if (entry == NULL) {
1165                 pr_info("(%s) ARGH, received res. reply for an entry that doesn't exist.\n",
1166                         mpc->dev->name);
1167                 return;
1168         }
1169         ddprintk_cont(" entry_state = %d ", entry->entry_state);
1170 
1171         if (entry->entry_state == INGRESS_RESOLVED) {
1172                 pr_info("(%s) RESOLVED entry!\n", mpc->dev->name);
1173                 mpc->in_ops->put(entry);
1174                 return;
1175         }
1176 
1177         entry->ctrl_info = msg->content.in_info;
1178         entry->time = ktime_get_seconds();
1179         /* Used in refreshing func from now on */
1180         entry->reply_wait = ktime_get_seconds();
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 unsigned long checking_time;
1412 
1413 static void mpc_timer_refresh(void)
1414 {
1415         mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1416         checking_time = mpc_timer.expires;
1417         add_timer(&mpc_timer);
1418 }
1419 
1420 static void mpc_cache_check(struct timer_list *unused)
1421 {
1422         struct mpoa_client *mpc = mpcs;
1423         static unsigned long previous_resolving_check_time;
1424         static unsigned long previous_refresh_time;
1425 
1426         while (mpc != NULL) {
1427                 mpc->in_ops->clear_count(mpc);
1428                 mpc->eg_ops->clear_expired(mpc);
1429                 if (checking_time - previous_resolving_check_time >
1430                     mpc->parameters.mpc_p4 * HZ) {
1431                         mpc->in_ops->check_resolving(mpc);
1432                         previous_resolving_check_time = checking_time;
1433                 }
1434                 if (checking_time - previous_refresh_time >
1435                     mpc->parameters.mpc_p5 * HZ) {
1436                         mpc->in_ops->refresh(mpc);
1437                         previous_refresh_time = checking_time;
1438                 }
1439                 mpc = mpc->next;
1440         }
1441         mpc_timer_refresh();
1442 }
1443 
1444 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd,
1445                           unsigned long arg)
1446 {
1447         int err = 0;
1448         struct atm_vcc *vcc = ATM_SD(sock);
1449 
1450         if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1451                 return -ENOIOCTLCMD;
1452 
1453         if (!capable(CAP_NET_ADMIN))
1454                 return -EPERM;
1455 
1456         switch (cmd) {
1457         case ATMMPC_CTRL:
1458                 err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1459                 if (err >= 0)
1460                         sock->state = SS_CONNECTED;
1461                 break;
1462         case ATMMPC_DATA:
1463                 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1464                 break;
1465         default:
1466                 break;
1467         }
1468         return err;
1469 }
1470 
1471 static struct atm_ioctl atm_ioctl_ops = {
1472         .owner  = THIS_MODULE,
1473         .ioctl  = atm_mpoa_ioctl,
1474 };
1475 
1476 static __init int atm_mpoa_init(void)
1477 {
1478         register_atm_ioctl(&atm_ioctl_ops);
1479 
1480         if (mpc_proc_init() != 0)
1481                 pr_info("failed to initialize /proc/mpoa\n");
1482 
1483         pr_info("mpc.c: initialized\n");
1484 
1485         return 0;
1486 }
1487 
1488 static void __exit atm_mpoa_cleanup(void)
1489 {
1490         struct mpoa_client *mpc, *tmp;
1491         struct atm_mpoa_qos *qos, *nextqos;
1492         struct lec_priv *priv;
1493 
1494         mpc_proc_clean();
1495 
1496         del_timer_sync(&mpc_timer);
1497         unregister_netdevice_notifier(&mpoa_notifier);
1498         deregister_atm_ioctl(&atm_ioctl_ops);
1499 
1500         mpc = mpcs;
1501         mpcs = NULL;
1502         while (mpc != NULL) {
1503                 tmp = mpc->next;
1504                 if (mpc->dev != NULL) {
1505                         stop_mpc(mpc);
1506                         priv = netdev_priv(mpc->dev);
1507                         if (priv->lane2_ops != NULL)
1508                                 priv->lane2_ops->associate_indicator = NULL;
1509                 }
1510                 ddprintk("about to clear caches\n");
1511                 mpc->in_ops->destroy_cache(mpc);
1512                 mpc->eg_ops->destroy_cache(mpc);
1513                 ddprintk("caches cleared\n");
1514                 kfree(mpc->mps_macs);
1515                 memset(mpc, 0, sizeof(struct mpoa_client));
1516                 ddprintk("about to kfree %p\n", mpc);
1517                 kfree(mpc);
1518                 ddprintk("next mpc is at %p\n", tmp);
1519                 mpc = tmp;
1520         }
1521 
1522         qos = qos_head;
1523         qos_head = NULL;
1524         while (qos != NULL) {
1525                 nextqos = qos->next;
1526                 dprintk("freeing qos entry %p\n", qos);
1527                 kfree(qos);
1528                 qos = nextqos;
1529         }
1530 }
1531 
1532 module_init(atm_mpoa_init);
1533 module_exit(atm_mpoa_cleanup);
1534 
1535 MODULE_LICENSE("GPL");
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root/net/atm/mpc.c

DEFINITIONS
