linux/net/atm/mpc.c
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   1#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
   2
   3#include <linux/kernel.h>
   4#include <linux/string.h>
   5#include <linux/slab.h>
   6#include <linux/timer.h>
   7#include <linux/init.h>
   8#include <linux/bitops.h>
   9#include <linux/capability.h>
  10#include <linux/seq_file.h>
  11
  12/* We are an ethernet device */
  13#include <linux/if_ether.h>
  14#include <linux/netdevice.h>
  15#include <linux/etherdevice.h>
  16#include <net/sock.h>
  17#include <linux/skbuff.h>
  18#include <linux/ip.h>
  19#include <linux/uaccess.h>
  20#include <asm/byteorder.h>
  21#include <net/checksum.h>   /* for ip_fast_csum() */
  22#include <net/arp.h>
  23#include <net/dst.h>
  24#include <linux/proc_fs.h>
  25
  26/* And atm device */
  27#include <linux/atmdev.h>
  28#include <linux/atmlec.h>
  29#include <linux/atmmpc.h>
  30/* Modular too */
  31#include <linux/module.h>
  32
  33#include "lec.h"
  34#include "mpc.h"
  35#include "resources.h"
  36
  37/*
  38 * mpc.c: Implementation of MPOA client kernel part
  39 */
  40
  41#if 0
  42#define dprintk(format, args...) \
  43        printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args)
  44#define dprintk_cont(format, args...) printk(KERN_CONT format, ##args)
  45#else
  46#define dprintk(format, args...)                                        \
  47        do { if (0)                                                     \
  48                printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\
  49        } while (0)
  50#define dprintk_cont(format, args...)                   \
  51        do { if (0) printk(KERN_CONT format, ##args); } while (0)
  52#endif
  53
  54#if 0
  55#define ddprintk(format, args...) \
  56        printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args)
  57#define ddprintk_cont(format, args...) printk(KERN_CONT format, ##args)
  58#else
  59#define ddprintk(format, args...)                                       \
  60        do { if (0)                                                     \
  61                printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\
  62        } while (0)
  63#define ddprintk_cont(format, args...)                  \
  64        do { if (0) printk(KERN_CONT format, ##args); } while (0)
  65#endif
  66
  67#define MPOA_TAG_LEN 4
  68
  69/* mpc_daemon -> kernel */
  70static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc);
  71static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc);
  72static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
  73static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc);
  74static void mps_death(struct k_message *msg, struct mpoa_client *mpc);
  75static void clean_up(struct k_message *msg, struct mpoa_client *mpc,
  76                     int action);
  77static void MPOA_cache_impos_rcvd(struct k_message *msg,
  78                                  struct mpoa_client *mpc);
  79static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg,
  80                                   struct mpoa_client *mpc);
  81static void set_mps_mac_addr_rcvd(struct k_message *mesg,
  82                                  struct mpoa_client *mpc);
  83
  84static const uint8_t *copy_macs(struct mpoa_client *mpc,
  85                                const uint8_t *router_mac,
  86                                const uint8_t *tlvs, uint8_t mps_macs,
  87                                uint8_t device_type);
  88static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry);
  89
  90static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc);
  91static void mpoad_close(struct atm_vcc *vcc);
  92static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb);
  93
  94static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb);
  95static netdev_tx_t mpc_send_packet(struct sk_buff *skb,
  96                                   struct net_device *dev);
  97static int mpoa_event_listener(struct notifier_block *mpoa_notifier,
  98                               unsigned long event, void *dev);
  99static void mpc_timer_refresh(void);
 100static void mpc_cache_check(unsigned long checking_time);
 101
 102static struct llc_snap_hdr llc_snap_mpoa_ctrl = {
 103        0xaa, 0xaa, 0x03,
 104        {0x00, 0x00, 0x5e},
 105        {0x00, 0x03}         /* For MPOA control PDUs */
 106};
 107static struct llc_snap_hdr llc_snap_mpoa_data = {
 108        0xaa, 0xaa, 0x03,
 109        {0x00, 0x00, 0x00},
 110        {0x08, 0x00}         /* This is for IP PDUs only */
 111};
 112static struct llc_snap_hdr llc_snap_mpoa_data_tagged = {
 113        0xaa, 0xaa, 0x03,
 114        {0x00, 0x00, 0x00},
 115        {0x88, 0x4c}         /* This is for tagged data PDUs */
 116};
 117
 118static struct notifier_block mpoa_notifier = {
 119        mpoa_event_listener,
 120        NULL,
 121        0
 122};
 123
 124struct mpoa_client *mpcs = NULL; /* FIXME */
 125static struct atm_mpoa_qos *qos_head = NULL;
 126static DEFINE_TIMER(mpc_timer, NULL, 0, 0);
 127
 128
 129static struct mpoa_client *find_mpc_by_itfnum(int itf)
 130{
 131        struct mpoa_client *mpc;
 132
 133        mpc = mpcs;  /* our global linked list */
 134        while (mpc != NULL) {
 135                if (mpc->dev_num == itf)
 136                        return mpc;
 137                mpc = mpc->next;
 138        }
 139
 140        return NULL;   /* not found */
 141}
 142
 143static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc)
 144{
 145        struct mpoa_client *mpc;
 146
 147        mpc = mpcs;  /* our global linked list */
 148        while (mpc != NULL) {
 149                if (mpc->mpoad_vcc == vcc)
 150                        return mpc;
 151                mpc = mpc->next;
 152        }
 153
 154        return NULL;   /* not found */
 155}
 156
 157static struct mpoa_client *find_mpc_by_lec(struct net_device *dev)
 158{
 159        struct mpoa_client *mpc;
 160
 161        mpc = mpcs;  /* our global linked list */
 162        while (mpc != NULL) {
 163                if (mpc->dev == dev)
 164                        return mpc;
 165                mpc = mpc->next;
 166        }
 167
 168        return NULL;   /* not found */
 169}
 170
 171/*
 172 * Functions for managing QoS list
 173 */
 174
 175/*
 176 * Overwrites the old entry or makes a new one.
 177 */
 178struct atm_mpoa_qos *atm_mpoa_add_qos(__be32 dst_ip, struct atm_qos *qos)
 179{
 180        struct atm_mpoa_qos *entry;
 181
 182        entry = atm_mpoa_search_qos(dst_ip);
 183        if (entry != NULL) {
 184                entry->qos = *qos;
 185                return entry;
 186        }
 187
 188        entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL);
 189        if (entry == NULL) {
 190                pr_info("mpoa: out of memory\n");
 191                return entry;
 192        }
 193
 194        entry->ipaddr = dst_ip;
 195        entry->qos = *qos;
 196
 197        entry->next = qos_head;
 198        qos_head = entry;
 199
 200        return entry;
 201}
 202
 203struct atm_mpoa_qos *atm_mpoa_search_qos(__be32 dst_ip)
 204{
 205        struct atm_mpoa_qos *qos;
 206
 207        qos = qos_head;
 208        while (qos) {
 209                if (qos->ipaddr == dst_ip)
 210                        break;
 211                qos = qos->next;
 212        }
 213
 214        return qos;
 215}
 216
 217/*
 218 * Returns 0 for failure
 219 */
 220int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry)
 221{
 222        struct atm_mpoa_qos *curr;
 223
 224        if (entry == NULL)
 225                return 0;
 226        if (entry == qos_head) {
 227                qos_head = qos_head->next;
 228                kfree(entry);
 229                return 1;
 230        }
 231
 232        curr = qos_head;
 233        while (curr != NULL) {
 234                if (curr->next == entry) {
 235                        curr->next = entry->next;
 236                        kfree(entry);
 237                        return 1;
 238                }
 239                curr = curr->next;
 240        }
 241
 242        return 0;
 243}
 244
 245/* this is buggered - we need locking for qos_head */
 246void atm_mpoa_disp_qos(struct seq_file *m)
 247{
 248        struct atm_mpoa_qos *qos;
 249
 250        qos = qos_head;
 251        seq_printf(m, "QoS entries for shortcuts:\n");
 252        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");
 253
 254        while (qos != NULL) {
 255                seq_printf(m, "%pI4\n     %-7d %-7d %-7d %-7d %-7d\n     %-7d %-7d %-7d %-7d %-7d\n",
 256                           &qos->ipaddr,
 257                           qos->qos.txtp.max_pcr,
 258                           qos->qos.txtp.pcr,
 259                           qos->qos.txtp.min_pcr,
 260                           qos->qos.txtp.max_cdv,
 261                           qos->qos.txtp.max_sdu,
 262                           qos->qos.rxtp.max_pcr,
 263                           qos->qos.rxtp.pcr,
 264                           qos->qos.rxtp.min_pcr,
 265                           qos->qos.rxtp.max_cdv,
 266                           qos->qos.rxtp.max_sdu);
 267                qos = qos->next;
 268        }
 269}
 270
 271static struct net_device *find_lec_by_itfnum(int itf)
 272{
 273        struct net_device *dev;
 274        char name[IFNAMSIZ];
 275
 276        sprintf(name, "lec%d", itf);
 277        dev = dev_get_by_name(&init_net, name);
 278
 279        return dev;
 280}
 281
 282static struct mpoa_client *alloc_mpc(void)
 283{
 284        struct mpoa_client *mpc;
 285
 286        mpc = kzalloc(sizeof(struct mpoa_client), GFP_KERNEL);
 287        if (mpc == NULL)
 288                return NULL;
 289        rwlock_init(&mpc->ingress_lock);
 290        rwlock_init(&mpc->egress_lock);
 291        mpc->next = mpcs;
 292        atm_mpoa_init_cache(mpc);
 293
 294        mpc->parameters.mpc_p1 = MPC_P1;
 295        mpc->parameters.mpc_p2 = MPC_P2;
 296        memset(mpc->parameters.mpc_p3, 0, sizeof(mpc->parameters.mpc_p3));
 297        mpc->parameters.mpc_p4 = MPC_P4;
 298        mpc->parameters.mpc_p5 = MPC_P5;
 299        mpc->parameters.mpc_p6 = MPC_P6;
 300
 301        mpcs = mpc;
 302
 303        return mpc;
 304}
 305
 306/*
 307 *
 308 * start_mpc() puts the MPC on line. All the packets destined
 309 * to the lec underneath us are now being monitored and
 310 * shortcuts will be established.
 311 *
 312 */
 313static void start_mpc(struct mpoa_client *mpc, struct net_device *dev)
 314{
 315
 316        dprintk("(%s)\n", mpc->dev->name);
 317        if (!dev->netdev_ops)
 318                pr_info("(%s) not starting\n", dev->name);
 319        else {
 320                mpc->old_ops = dev->netdev_ops;
 321                mpc->new_ops = *mpc->old_ops;
 322                mpc->new_ops.ndo_start_xmit = mpc_send_packet;
 323                dev->netdev_ops = &mpc->new_ops;
 324        }
 325}
 326
 327static void stop_mpc(struct mpoa_client *mpc)
 328{
 329        struct net_device *dev = mpc->dev;
 330        dprintk("(%s)", mpc->dev->name);
 331
 332        /* Lets not nullify lec device's dev->hard_start_xmit */
 333        if (dev->netdev_ops != &mpc->new_ops) {
 334                dprintk_cont(" mpc already stopped, not fatal\n");
 335                return;
 336        }
 337        dprintk_cont("\n");
 338
 339        dev->netdev_ops = mpc->old_ops;
 340        mpc->old_ops = NULL;
 341
 342        /* close_shortcuts(mpc);    ??? FIXME */
 343}
 344
 345static const char *mpoa_device_type_string(char type) __attribute__ ((unused));
 346
 347static const char *mpoa_device_type_string(char type)
 348{
 349        switch (type) {
 350        case NON_MPOA:
 351                return "non-MPOA device";
 352        case MPS:
 353                return "MPS";
 354        case MPC:
 355                return "MPC";
 356        case MPS_AND_MPC:
 357                return "both MPS and MPC";
 358        }
 359
 360        return "unspecified (non-MPOA) device";
 361}
 362
 363/*
 364 * lec device calls this via its netdev_priv(dev)->lane2_ops
 365 * ->associate_indicator() when it sees a TLV in LE_ARP packet.
 366 * We fill in the pointer above when we see a LANE2 lec initializing
 367 * See LANE2 spec 3.1.5
 368 *
 369 * Quite a big and ugly function but when you look at it
 370 * all it does is to try to locate and parse MPOA Device
 371 * Type TLV.
 372 * We give our lec a pointer to this function and when the
 373 * lec sees a TLV it uses the pointer to call this function.
 374 *
 375 */
 376static void lane2_assoc_ind(struct net_device *dev, const u8 *mac_addr,
 377                            const u8 *tlvs, u32 sizeoftlvs)
 378{
 379        uint32_t type;
 380        uint8_t length, mpoa_device_type, number_of_mps_macs;
 381        const uint8_t *end_of_tlvs;
 382        struct mpoa_client *mpc;
 383
 384        mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */
 385        dprintk("(%s) received TLV(s), ", dev->name);
 386        dprintk("total length of all TLVs %d\n", sizeoftlvs);
 387        mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */
 388        if (mpc == NULL) {
 389                pr_info("(%s) no mpc\n", dev->name);
 390                return;
 391        }
 392        end_of_tlvs = tlvs + sizeoftlvs;
 393        while (end_of_tlvs - tlvs >= 5) {
 394                type = ((tlvs[0] << 24) | (tlvs[1] << 16) |
 395                        (tlvs[2] << 8) | tlvs[3]);
 396                length = tlvs[4];
 397                tlvs += 5;
 398                dprintk("    type 0x%x length %02x\n", type, length);
 399                if (tlvs + length > end_of_tlvs) {
 400                        pr_info("TLV value extends past its buffer, aborting parse\n");
 401                        return;
 402                }
 403
 404                if (type == 0) {
 405                        pr_info("mpoa: (%s) TLV type was 0, returning\n",
 406                                dev->name);
 407                        return;
 408                }
 409
 410                if (type != TLV_MPOA_DEVICE_TYPE) {
 411                        tlvs += length;
 412                        continue;  /* skip other TLVs */
 413                }
 414                mpoa_device_type = *tlvs++;
 415                number_of_mps_macs = *tlvs++;
 416                dprintk("(%s) MPOA device type '%s', ",
 417                        dev->name, mpoa_device_type_string(mpoa_device_type));
 418                if (mpoa_device_type == MPS_AND_MPC &&
 419                    length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */
 420                        pr_info("(%s) short MPOA Device Type TLV\n",
 421                                dev->name);
 422                        continue;
 423                }
 424                if ((mpoa_device_type == MPS || mpoa_device_type == MPC) &&
 425                    length < 22 + number_of_mps_macs*ETH_ALEN) {
 426                        pr_info("(%s) short MPOA Device Type TLV\n", dev->name);
 427                        continue;
 428                }
 429                if (mpoa_device_type != MPS &&
 430                    mpoa_device_type != MPS_AND_MPC) {
 431                        dprintk("ignoring non-MPS device ");
 432                        if (mpoa_device_type == MPC)
 433                                tlvs += 20;
 434                        continue;  /* we are only interested in MPSs */
 435                }
 436                if (number_of_mps_macs == 0 &&
 437                    mpoa_device_type == MPS_AND_MPC) {
 438                        pr_info("(%s) MPS_AND_MPC has zero MACs\n", dev->name);
 439                        continue;  /* someone should read the spec */
 440                }
 441                dprintk_cont("this MPS has %d MAC addresses\n",
 442                             number_of_mps_macs);
 443
 444                /*
 445                 * ok, now we can go and tell our daemon
 446                 * the control address of MPS
 447                 */
 448                send_set_mps_ctrl_addr(tlvs, mpc);
 449
 450                tlvs = copy_macs(mpc, mac_addr, tlvs,
 451                                 number_of_mps_macs, mpoa_device_type);
 452                if (tlvs == NULL)
 453                        return;
 454        }
 455        if (end_of_tlvs - tlvs != 0)
 456                pr_info("(%s) ignoring %Zd bytes of trailing TLV garbage\n",
 457                        dev->name, end_of_tlvs - tlvs);
 458}
 459
 460/*
 461 * Store at least advertizing router's MAC address
 462 * plus the possible MAC address(es) to mpc->mps_macs.
 463 * For a freshly allocated MPOA client mpc->mps_macs == 0.
 464 */
 465static const uint8_t *copy_macs(struct mpoa_client *mpc,
 466                                const uint8_t *router_mac,
 467                                const uint8_t *tlvs, uint8_t mps_macs,
 468                                uint8_t device_type)
 469{
 470        int num_macs;
 471        num_macs = (mps_macs > 1) ? mps_macs : 1;
 472
 473        if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */
 474                if (mpc->number_of_mps_macs != 0)
 475                        kfree(mpc->mps_macs);
 476                mpc->number_of_mps_macs = 0;
 477                mpc->mps_macs = kmalloc(num_macs * ETH_ALEN, GFP_KERNEL);
 478                if (mpc->mps_macs == NULL) {
 479                        pr_info("(%s) out of mem\n", mpc->dev->name);
 480                        return NULL;
 481                }
 482        }
 483        memcpy(mpc->mps_macs, router_mac, ETH_ALEN);
 484        tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20;
 485        if (mps_macs > 0)
 486                memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN);
 487        tlvs += mps_macs*ETH_ALEN;
 488        mpc->number_of_mps_macs = num_macs;
 489
 490        return tlvs;
 491}
 492
 493static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc)
 494{
 495        in_cache_entry *entry;
 496        struct iphdr *iph;
 497        char *buff;
 498        __be32 ipaddr = 0;
 499
 500        static struct {
 501                struct llc_snap_hdr hdr;
 502                __be32 tag;
 503        } tagged_llc_snap_hdr = {
 504                {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}},
 505                0
 506        };
 507
 508        buff = skb->data + mpc->dev->hard_header_len;
 509        iph = (struct iphdr *)buff;
 510        ipaddr = iph->daddr;
 511
 512        ddprintk("(%s) ipaddr 0x%x\n",
 513                 mpc->dev->name, ipaddr);
 514
 515        entry = mpc->in_ops->get(ipaddr, mpc);
 516        if (entry == NULL) {
 517                entry = mpc->in_ops->add_entry(ipaddr, mpc);
 518                if (entry != NULL)
 519                        mpc->in_ops->put(entry);
 520                return 1;
 521        }
 522        /* threshold not exceeded or VCC not ready */
 523        if (mpc->in_ops->cache_hit(entry, mpc) != OPEN) {
 524                ddprintk("(%s) cache_hit: returns != OPEN\n",
 525                         mpc->dev->name);
 526                mpc->in_ops->put(entry);
 527                return 1;
 528        }
 529
 530        ddprintk("(%s) using shortcut\n",
 531                 mpc->dev->name);
 532        /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */
 533        if (iph->ttl <= 1) {
 534                ddprintk("(%s) IP ttl = %u, using LANE\n",
 535                         mpc->dev->name, iph->ttl);
 536                mpc->in_ops->put(entry);
 537                return 1;
 538        }
 539        iph->ttl--;
 540        iph->check = 0;
 541        iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
 542
 543        if (entry->ctrl_info.tag != 0) {
 544                ddprintk("(%s) adding tag 0x%x\n",
 545                         mpc->dev->name, entry->ctrl_info.tag);
 546                tagged_llc_snap_hdr.tag = entry->ctrl_info.tag;
 547                skb_pull(skb, ETH_HLEN);        /* get rid of Eth header */
 548                skb_push(skb, sizeof(tagged_llc_snap_hdr));
 549                                                /* add LLC/SNAP header   */
 550                skb_copy_to_linear_data(skb, &tagged_llc_snap_hdr,
 551                                        sizeof(tagged_llc_snap_hdr));
 552        } else {
 553                skb_pull(skb, ETH_HLEN);        /* get rid of Eth header */
 554                skb_push(skb, sizeof(struct llc_snap_hdr));
 555                                                /* add LLC/SNAP header + tag  */
 556                skb_copy_to_linear_data(skb, &llc_snap_mpoa_data,
 557                                        sizeof(struct llc_snap_hdr));
 558        }
 559
 560        atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc);
 561        ATM_SKB(skb)->atm_options = entry->shortcut->atm_options;
 562        entry->shortcut->send(entry->shortcut, skb);
 563        entry->packets_fwded++;
 564        mpc->in_ops->put(entry);
 565
 566        return 0;
 567}
 568
 569/*
 570 * Probably needs some error checks and locking, not sure...
 571 */
 572static netdev_tx_t mpc_send_packet(struct sk_buff *skb,
 573                                         struct net_device *dev)
 574{
 575        struct mpoa_client *mpc;
 576        struct ethhdr *eth;
 577        int i = 0;
 578
 579        mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
 580        if (mpc == NULL) {
 581                pr_info("(%s) no MPC found\n", dev->name);
 582                goto non_ip;
 583        }
 584
 585        eth = (struct ethhdr *)skb->data;
 586        if (eth->h_proto != htons(ETH_P_IP))
 587                goto non_ip; /* Multi-Protocol Over ATM :-) */
 588
 589        /* Weed out funny packets (e.g., AF_PACKET or raw). */
 590        if (skb->len < ETH_HLEN + sizeof(struct iphdr))
 591                goto non_ip;
 592        skb_set_network_header(skb, ETH_HLEN);
 593        if (skb->len < ETH_HLEN + ip_hdr(skb)->ihl * 4 || ip_hdr(skb)->ihl < 5)
 594                goto non_ip;
 595
 596        while (i < mpc->number_of_mps_macs) {
 597                if (!compare_ether_addr(eth->h_dest,
 598                                        (mpc->mps_macs + i*ETH_ALEN)))
 599                        if (send_via_shortcut(skb, mpc) == 0) /* try shortcut */
 600                                return NETDEV_TX_OK;
 601                i++;
 602        }
 603
 604non_ip:
 605        return mpc->old_ops->ndo_start_xmit(skb, dev);
 606}
 607
 608static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg)
 609{
 610        int bytes_left;
 611        struct mpoa_client *mpc;
 612        struct atmmpc_ioc ioc_data;
 613        in_cache_entry *in_entry;
 614        __be32  ipaddr;
 615
 616        bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc));
 617        if (bytes_left != 0) {
 618                pr_info("mpoa:Short read (missed %d bytes) from userland\n",
 619                        bytes_left);
 620                return -EFAULT;
 621        }
 622        ipaddr = ioc_data.ipaddr;
 623        if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF)
 624                return -EINVAL;
 625
 626        mpc = find_mpc_by_itfnum(ioc_data.dev_num);
 627        if (mpc == NULL)
 628                return -EINVAL;
 629
 630        if (ioc_data.type == MPC_SOCKET_INGRESS) {
 631                in_entry = mpc->in_ops->get(ipaddr, mpc);
 632                if (in_entry == NULL ||
 633                    in_entry->entry_state < INGRESS_RESOLVED) {
 634                        pr_info("(%s) did not find RESOLVED entry from ingress cache\n",
 635                                mpc->dev->name);
 636                        if (in_entry != NULL)
 637                                mpc->in_ops->put(in_entry);
 638                        return -EINVAL;
 639                }
 640                pr_info("(%s) attaching ingress SVC, entry = %pI4\n",
 641                        mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
 642                in_entry->shortcut = vcc;
 643                mpc->in_ops->put(in_entry);
 644        } else {
 645                pr_info("(%s) attaching egress SVC\n", mpc->dev->name);
 646        }
 647
 648        vcc->proto_data = mpc->dev;
 649        vcc->push = mpc_push;
 650
 651        return 0;
 652}
 653
 654/*
 655 *
 656 */
 657static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev)
 658{
 659        struct mpoa_client *mpc;
 660        in_cache_entry *in_entry;
 661        eg_cache_entry *eg_entry;
 662
 663        mpc = find_mpc_by_lec(dev);
 664        if (mpc == NULL) {
 665                pr_info("(%s) close for unknown MPC\n", dev->name);
 666                return;
 667        }
 668
 669        dprintk("(%s)\n", dev->name);
 670        in_entry = mpc->in_ops->get_by_vcc(vcc, mpc);
 671        if (in_entry) {
 672                dprintk("(%s) ingress SVC closed ip = %pI4\n",
 673                        mpc->dev->name, &in_entry->ctrl_info.in_dst_ip);
 674                in_entry->shortcut = NULL;
 675                mpc->in_ops->put(in_entry);
 676        }
 677        eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc);
 678        if (eg_entry) {
 679                dprintk("(%s) egress SVC closed\n", mpc->dev->name);
 680                eg_entry->shortcut = NULL;
 681                mpc->eg_ops->put(eg_entry);
 682        }
 683
 684        if (in_entry == NULL && eg_entry == NULL)
 685                dprintk("(%s) unused vcc closed\n", dev->name);
 686}
 687
 688static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb)
 689{
 690        struct net_device *dev = (struct net_device *)vcc->proto_data;
 691        struct sk_buff *new_skb;
 692        eg_cache_entry *eg;
 693        struct mpoa_client *mpc;
 694        __be32 tag;
 695        char *tmp;
 696
 697        ddprintk("(%s)\n", dev->name);
 698        if (skb == NULL) {
 699                dprintk("(%s) null skb, closing VCC\n", dev->name);
 700                mpc_vcc_close(vcc, dev);
 701                return;
 702        }
 703
 704        skb->dev = dev;
 705        if (memcmp(skb->data, &llc_snap_mpoa_ctrl,
 706                   sizeof(struct llc_snap_hdr)) == 0) {
 707                struct sock *sk = sk_atm(vcc);
 708
 709                dprintk("(%s) control packet arrived\n", dev->name);
 710                /* Pass control packets to daemon */
 711                skb_queue_tail(&sk->sk_receive_queue, skb);
 712                sk->sk_data_ready(sk, skb->len);
 713                return;
 714        }
 715
 716        /* data coming over the shortcut */
 717        atm_return(vcc, skb->truesize);
 718
 719        mpc = find_mpc_by_lec(dev);
 720        if (mpc == NULL) {
 721                pr_info("(%s) unknown MPC\n", dev->name);
 722                return;
 723        }
 724
 725        if (memcmp(skb->data, &llc_snap_mpoa_data_tagged,
 726                   sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */
 727                ddprintk("(%s) tagged data packet arrived\n", dev->name);
 728
 729        } else if (memcmp(skb->data, &llc_snap_mpoa_data,
 730                          sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */
 731                pr_info("(%s) Unsupported non-tagged data packet arrived.  Purging\n",
 732                        dev->name);
 733                dev_kfree_skb_any(skb);
 734                return;
 735        } else {
 736                pr_info("(%s) garbage arrived, purging\n", dev->name);
 737                dev_kfree_skb_any(skb);
 738                return;
 739        }
 740
 741        tmp = skb->data + sizeof(struct llc_snap_hdr);
 742        tag = *(__be32 *)tmp;
 743
 744        eg = mpc->eg_ops->get_by_tag(tag, mpc);
 745        if (eg == NULL) {
 746                pr_info("mpoa: (%s) Didn't find egress cache entry, tag = %u\n",
 747                        dev->name, tag);
 748                purge_egress_shortcut(vcc, NULL);
 749                dev_kfree_skb_any(skb);
 750                return;
 751        }
 752
 753        /*
 754         * See if ingress MPC is using shortcut we opened as a return channel.
 755         * This means we have a bi-directional vcc opened by us.
 756         */
 757        if (eg->shortcut == NULL) {
 758                eg->shortcut = vcc;
 759                pr_info("(%s) egress SVC in use\n", dev->name);
 760        }
 761
 762        skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag));
 763                                        /* get rid of LLC/SNAP header */
 764        new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length);
 765                                        /* LLC/SNAP is shorter than MAC header :( */
 766        dev_kfree_skb_any(skb);
 767        if (new_skb == NULL) {
 768                mpc->eg_ops->put(eg);
 769                return;
 770        }
 771        skb_push(new_skb, eg->ctrl_info.DH_length);     /* add MAC header */
 772        skb_copy_to_linear_data(new_skb, eg->ctrl_info.DLL_header,
 773                                eg->ctrl_info.DH_length);
 774        new_skb->protocol = eth_type_trans(new_skb, dev);
 775        skb_reset_network_header(new_skb);
 776
 777        eg->latest_ip_addr = ip_hdr(new_skb)->saddr;
 778        eg->packets_rcvd++;
 779        mpc->eg_ops->put(eg);
 780
 781        memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
 782        netif_rx(new_skb);
 783}
 784
 785static struct atmdev_ops mpc_ops = { /* only send is required */
 786        .close  = mpoad_close,
 787        .send   = msg_from_mpoad
 788};
 789
 790static struct atm_dev mpc_dev = {
 791        .ops    = &mpc_ops,
 792        .type   = "mpc",
 793        .number = 42,
 794        .lock   = __SPIN_LOCK_UNLOCKED(mpc_dev.lock)
 795        /* members not explicitly initialised will be 0 */
 796};
 797
 798static int atm_mpoa_mpoad_attach(struct atm_vcc *vcc, int arg)
 799{
 800        struct mpoa_client *mpc;
 801        struct lec_priv *priv;
 802        int err;
 803
 804        if (mpcs == NULL) {
 805                init_timer(&mpc_timer);
 806                mpc_timer_refresh();
 807
 808                /* This lets us now how our LECs are doing */
 809                err = register_netdevice_notifier(&mpoa_notifier);
 810                if (err < 0) {
 811                        del_timer(&mpc_timer);
 812                        return err;
 813                }
 814        }
 815
 816        mpc = find_mpc_by_itfnum(arg);
 817        if (mpc == NULL) {
 818                dprintk("allocating new mpc for itf %d\n", arg);
 819                mpc = alloc_mpc();
 820                if (mpc == NULL)
 821                        return -ENOMEM;
 822                mpc->dev_num = arg;
 823                mpc->dev = find_lec_by_itfnum(arg);
 824                                        /* NULL if there was no lec */
 825        }
 826        if (mpc->mpoad_vcc) {
 827                pr_info("mpoad is already present for itf %d\n", arg);
 828                return -EADDRINUSE;
 829        }
 830
 831        if (mpc->dev) { /* check if the lec is LANE2 capable */
 832                priv = netdev_priv(mpc->dev);
 833                if (priv->lane_version < 2) {
 834                        dev_put(mpc->dev);
 835                        mpc->dev = NULL;
 836                } else
 837                        priv->lane2_ops->associate_indicator = lane2_assoc_ind;
 838        }
 839
 840        mpc->mpoad_vcc = vcc;
 841        vcc->dev = &mpc_dev;
 842        vcc_insert_socket(sk_atm(vcc));
 843        set_bit(ATM_VF_META, &vcc->flags);
 844        set_bit(ATM_VF_READY, &vcc->flags);
 845
 846        if (mpc->dev) {
 847                char empty[ATM_ESA_LEN];
 848                memset(empty, 0, ATM_ESA_LEN);
 849
 850                start_mpc(mpc, mpc->dev);
 851                /* set address if mpcd e.g. gets killed and restarted.
 852                 * If we do not do it now we have to wait for the next LE_ARP
 853                 */
 854                if (memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0)
 855                        send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc);
 856        }
 857
 858        __module_get(THIS_MODULE);
 859        return arg;
 860}
 861
 862static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc)
 863{
 864        struct k_message mesg;
 865
 866        memcpy(mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
 867
 868        mesg.type = SET_MPS_CTRL_ADDR;
 869        memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
 870        msg_to_mpoad(&mesg, mpc);
 871}
 872
 873static void mpoad_close(struct atm_vcc *vcc)
 874{
 875        struct mpoa_client *mpc;
 876        struct sk_buff *skb;
 877
 878        mpc = find_mpc_by_vcc(vcc);
 879        if (mpc == NULL) {
 880                pr_info("did not find MPC\n");
 881                return;
 882        }
 883        if (!mpc->mpoad_vcc) {
 884                pr_info("close for non-present mpoad\n");
 885                return;
 886        }
 887
 888        mpc->mpoad_vcc = NULL;
 889        if (mpc->dev) {
 890                struct lec_priv *priv = netdev_priv(mpc->dev);
 891                priv->lane2_ops->associate_indicator = NULL;
 892                stop_mpc(mpc);
 893                dev_put(mpc->dev);
 894        }
 895
 896        mpc->in_ops->destroy_cache(mpc);
 897        mpc->eg_ops->destroy_cache(mpc);
 898
 899        while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) {
 900                atm_return(vcc, skb->truesize);
 901                kfree_skb(skb);
 902        }
 903
 904        pr_info("(%s) going down\n",
 905                (mpc->dev) ? mpc->dev->name : "<unknown>");
 906        module_put(THIS_MODULE);
 907}
 908
 909/*
 910 *
 911 */
 912static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb)
 913{
 914
 915        struct mpoa_client *mpc = find_mpc_by_vcc(vcc);
 916        struct k_message *mesg = (struct k_message *)skb->data;
 917        atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 918
 919        if (mpc == NULL) {
 920                pr_info("no mpc found\n");
 921                return 0;
 922        }
 923        dprintk("(%s)", mpc->dev ? mpc->dev->name : "<unknown>");
 924        switch (mesg->type) {
 925        case MPOA_RES_REPLY_RCVD:
 926                dprintk_cont("mpoa_res_reply_rcvd\n");
 927                MPOA_res_reply_rcvd(mesg, mpc);
 928                break;
 929        case MPOA_TRIGGER_RCVD:
 930                dprintk_cont("mpoa_trigger_rcvd\n");
 931                MPOA_trigger_rcvd(mesg, mpc);
 932                break;
 933        case INGRESS_PURGE_RCVD:
 934                dprintk_cont("nhrp_purge_rcvd\n");
 935                ingress_purge_rcvd(mesg, mpc);
 936                break;
 937        case EGRESS_PURGE_RCVD:
 938                dprintk_cont("egress_purge_reply_rcvd\n");
 939                egress_purge_rcvd(mesg, mpc);
 940                break;
 941        case MPS_DEATH:
 942                dprintk_cont("mps_death\n");
 943                mps_death(mesg, mpc);
 944                break;
 945        case CACHE_IMPOS_RCVD:
 946                dprintk_cont("cache_impos_rcvd\n");
 947                MPOA_cache_impos_rcvd(mesg, mpc);
 948                break;
 949        case SET_MPC_CTRL_ADDR:
 950                dprintk_cont("set_mpc_ctrl_addr\n");
 951                set_mpc_ctrl_addr_rcvd(mesg, mpc);
 952                break;
 953        case SET_MPS_MAC_ADDR:
 954                dprintk_cont("set_mps_mac_addr\n");
 955                set_mps_mac_addr_rcvd(mesg, mpc);
 956                break;
 957        case CLEAN_UP_AND_EXIT:
 958                dprintk_cont("clean_up_and_exit\n");
 959                clean_up(mesg, mpc, DIE);
 960                break;
 961        case RELOAD:
 962                dprintk_cont("reload\n");
 963                clean_up(mesg, mpc, RELOAD);
 964                break;
 965        case SET_MPC_PARAMS:
 966                dprintk_cont("set_mpc_params\n");
 967                mpc->parameters = mesg->content.params;
 968                break;
 969        default:
 970                dprintk_cont("unknown message %d\n", mesg->type);
 971                break;
 972        }
 973        kfree_skb(skb);
 974
 975        return 0;
 976}
 977
 978/* Remember that this function may not do things that sleep */
 979int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc)
 980{
 981        struct sk_buff *skb;
 982        struct sock *sk;
 983
 984        if (mpc == NULL || !mpc->mpoad_vcc) {
 985                pr_info("mesg %d to a non-existent mpoad\n", mesg->type);
 986                return -ENXIO;
 987        }
 988
 989        skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
 990        if (skb == NULL)
 991                return -ENOMEM;
 992        skb_put(skb, sizeof(struct k_message));
 993        skb_copy_to_linear_data(skb, mesg, sizeof(*mesg));
 994        atm_force_charge(mpc->mpoad_vcc, skb->truesize);
 995
 996        sk = sk_atm(mpc->mpoad_vcc);
 997        skb_queue_tail(&sk->sk_receive_queue, skb);
 998        sk->sk_data_ready(sk, skb->len);
 999
1000        return 0;
1001}
1002
1003static int mpoa_event_listener(struct notifier_block *mpoa_notifier,
1004                               unsigned long event, void *dev_ptr)
1005{
1006        struct net_device *dev;
1007        struct mpoa_client *mpc;
1008        struct lec_priv *priv;
1009
1010        dev = (struct net_device *)dev_ptr;
1011
1012        if (!net_eq(dev_net(dev), &init_net))
1013                return NOTIFY_DONE;
1014
1015        if (dev->name == NULL || strncmp(dev->name, "lec", 3))
1016                return NOTIFY_DONE; /* we are only interested in lec:s */
1017
1018        switch (event) {
1019        case NETDEV_REGISTER:       /* a new lec device was allocated */
1020                priv = netdev_priv(dev);
1021                if (priv->lane_version < 2)
1022                        break;
1023                priv->lane2_ops->associate_indicator = lane2_assoc_ind;
1024                mpc = find_mpc_by_itfnum(priv->itfnum);
1025                if (mpc == NULL) {
1026                        dprintk("allocating new mpc for %s\n", dev->name);
1027                        mpc = alloc_mpc();
1028                        if (mpc == NULL) {
1029                                pr_info("no new mpc");
1030                                break;
1031                        }
1032                }
1033                mpc->dev_num = priv->itfnum;
1034                mpc->dev = dev;
1035                dev_hold(dev);
1036                dprintk("(%s) was initialized\n", dev->name);
1037                break;
1038        case NETDEV_UNREGISTER:
1039                /* the lec device was deallocated */
1040                mpc = find_mpc_by_lec(dev);
1041                if (mpc == NULL)
1042                        break;
1043                dprintk("device (%s) was deallocated\n", dev->name);
1044                stop_mpc(mpc);
1045                dev_put(mpc->dev);
1046                mpc->dev = NULL;
1047                break;
1048        case NETDEV_UP:
1049                /* the dev was ifconfig'ed up */
1050                mpc = find_mpc_by_lec(dev);
1051                if (mpc == NULL)
1052                        break;
1053                if (mpc->mpoad_vcc != NULL)
1054                        start_mpc(mpc, dev);
1055                break;
1056        case NETDEV_DOWN:
1057                /* the dev was ifconfig'ed down */
1058                /* this means that the flow of packets from the
1059                 * upper layer stops
1060                 */
1061                mpc = find_mpc_by_lec(dev);
1062                if (mpc == NULL)
1063                        break;
1064                if (mpc->mpoad_vcc != NULL)
1065                        stop_mpc(mpc);
1066                break;
1067        case NETDEV_REBOOT:
1068        case NETDEV_CHANGE:
1069        case NETDEV_CHANGEMTU:
1070        case NETDEV_CHANGEADDR:
1071        case NETDEV_GOING_DOWN:
1072                break;
1073        default:
1074                break;
1075        }
1076
1077        return NOTIFY_DONE;
1078}
1079
1080/*
1081 * Functions which are called after a message is received from mpcd.
1082 * Msg is reused on purpose.
1083 */
1084
1085
1086static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1087{
1088        __be32 dst_ip = msg->content.in_info.in_dst_ip;
1089        in_cache_entry *entry;
1090
1091        entry = mpc->in_ops->get(dst_ip, mpc);
1092        if (entry == NULL) {
1093                entry = mpc->in_ops->add_entry(dst_ip, mpc);
1094                entry->entry_state = INGRESS_RESOLVING;
1095                msg->type = SND_MPOA_RES_RQST;
1096                msg->content.in_info = entry->ctrl_info;
1097                msg_to_mpoad(msg, mpc);
1098                do_gettimeofday(&(entry->reply_wait));
1099                mpc->in_ops->put(entry);
1100                return;
1101        }
1102
1103        if (entry->entry_state == INGRESS_INVALID) {
1104                entry->entry_state = INGRESS_RESOLVING;
1105                msg->type = SND_MPOA_RES_RQST;
1106                msg->content.in_info = entry->ctrl_info;
1107                msg_to_mpoad(msg, mpc);
1108                do_gettimeofday(&(entry->reply_wait));
1109                mpc->in_ops->put(entry);
1110                return;
1111        }
1112
1113        pr_info("(%s) entry already in resolving state\n",
1114                (mpc->dev) ? mpc->dev->name : "<unknown>");
1115        mpc->in_ops->put(entry);
1116}
1117
1118/*
1119 * Things get complicated because we have to check if there's an egress
1120 * shortcut with suitable traffic parameters we could use.
1121 */
1122static void check_qos_and_open_shortcut(struct k_message *msg,
1123                                        struct mpoa_client *client,
1124                                        in_cache_entry *entry)
1125{
1126        __be32 dst_ip = msg->content.in_info.in_dst_ip;
1127        struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
1128        eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
1129
1130        if (eg_entry && eg_entry->shortcut) {
1131                if (eg_entry->shortcut->qos.txtp.traffic_class &
1132                    msg->qos.txtp.traffic_class &
1133                    (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)) {
1134                        if (eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
1135                                entry->shortcut = eg_entry->shortcut;
1136                        else if (eg_entry->shortcut->qos.txtp.max_pcr > 0)
1137                                entry->shortcut = eg_entry->shortcut;
1138                }
1139                if (entry->shortcut) {
1140                        dprintk("(%s) using egress SVC to reach %pI4\n",
1141                                client->dev->name, &dst_ip);
1142                        client->eg_ops->put(eg_entry);
1143                        return;
1144                }
1145        }
1146        if (eg_entry != NULL)
1147                client->eg_ops->put(eg_entry);
1148
1149        /* No luck in the egress cache we must open an ingress SVC */
1150        msg->type = OPEN_INGRESS_SVC;
1151        if (qos &&
1152            (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class)) {
1153                msg->qos = qos->qos;
1154                pr_info("(%s) trying to get a CBR shortcut\n",
1155                        client->dev->name);
1156        } else
1157                memset(&msg->qos, 0, sizeof(struct atm_qos));
1158        msg_to_mpoad(msg, client);
1159}
1160
1161static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1162{
1163        __be32 dst_ip = msg->content.in_info.in_dst_ip;
1164        in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc);
1165
1166        dprintk("(%s) ip %pI4\n",
1167                mpc->dev->name, &dst_ip);
1168        ddprintk("(%s) entry = %p",
1169                 mpc->dev->name, entry);
1170        if (entry == NULL) {
1171                pr_info("(%s) ARGH, received res. reply for an entry that doesn't exist.\n",
1172                        mpc->dev->name);
1173                return;
1174        }
1175        ddprintk_cont(" entry_state = %d ", entry->entry_state);
1176
1177        if (entry->entry_state == INGRESS_RESOLVED) {
1178                pr_info("(%s) RESOLVED entry!\n", mpc->dev->name);
1179                mpc->in_ops->put(entry);
1180                return;
1181        }
1182
1183        entry->ctrl_info = msg->content.in_info;
1184        do_gettimeofday(&(entry->tv));
1185        do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
1186        entry->refresh_time = 0;
1187        ddprintk_cont("entry->shortcut = %p\n", entry->shortcut);
1188
1189        if (entry->entry_state == INGRESS_RESOLVING &&
1190            entry->shortcut != NULL) {
1191                entry->entry_state = INGRESS_RESOLVED;
1192                mpc->in_ops->put(entry);
1193                return; /* Shortcut already open... */
1194        }
1195
1196        if (entry->shortcut != NULL) {
1197                pr_info("(%s) entry->shortcut != NULL, impossible!\n",
1198                        mpc->dev->name);
1199                mpc->in_ops->put(entry);
1200                return;
1201        }
1202
1203        check_qos_and_open_shortcut(msg, mpc, entry);
1204        entry->entry_state = INGRESS_RESOLVED;
1205        mpc->in_ops->put(entry);
1206
1207        return;
1208
1209}
1210
1211static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1212{
1213        __be32 dst_ip = msg->content.in_info.in_dst_ip;
1214        __be32 mask = msg->ip_mask;
1215        in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1216
1217        if (entry == NULL) {
1218                pr_info("(%s) purge for a non-existing entry, ip = %pI4\n",
1219                        mpc->dev->name, &dst_ip);
1220                return;
1221        }
1222
1223        do {
1224                dprintk("(%s) removing an ingress entry, ip = %pI4\n",
1225                        mpc->dev->name, &dst_ip);
1226                write_lock_bh(&mpc->ingress_lock);
1227                mpc->in_ops->remove_entry(entry, mpc);
1228                write_unlock_bh(&mpc->ingress_lock);
1229                mpc->in_ops->put(entry);
1230                entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask);
1231        } while (entry != NULL);
1232}
1233
1234static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc)
1235{
1236        __be32 cache_id = msg->content.eg_info.cache_id;
1237        eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc);
1238
1239        if (entry == NULL) {
1240                dprintk("(%s) purge for a non-existing entry\n",
1241                        mpc->dev->name);
1242                return;
1243        }
1244
1245        write_lock_irq(&mpc->egress_lock);
1246        mpc->eg_ops->remove_entry(entry, mpc);
1247        write_unlock_irq(&mpc->egress_lock);
1248
1249        mpc->eg_ops->put(entry);
1250}
1251
1252static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry)
1253{
1254        struct sock *sk;
1255        struct k_message *purge_msg;
1256        struct sk_buff *skb;
1257
1258        dprintk("entering\n");
1259        if (vcc == NULL) {
1260                pr_info("vcc == NULL\n");
1261                return;
1262        }
1263
1264        skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC);
1265        if (skb == NULL) {
1266                pr_info("out of memory\n");
1267                return;
1268        }
1269
1270        skb_put(skb, sizeof(struct k_message));
1271        memset(skb->data, 0, sizeof(struct k_message));
1272        purge_msg = (struct k_message *)skb->data;
1273        purge_msg->type = DATA_PLANE_PURGE;
1274        if (entry != NULL)
1275                purge_msg->content.eg_info = entry->ctrl_info;
1276
1277        atm_force_charge(vcc, skb->truesize);
1278
1279        sk = sk_atm(vcc);
1280        skb_queue_tail(&sk->sk_receive_queue, skb);
1281        sk->sk_data_ready(sk, skb->len);
1282        dprintk("exiting\n");
1283}
1284
1285/*
1286 * Our MPS died. Tell our daemon to send NHRP data plane purge to each
1287 * of the egress shortcuts we have.
1288 */
1289static void mps_death(struct k_message *msg, struct mpoa_client *mpc)
1290{
1291        eg_cache_entry *entry;
1292
1293        dprintk("(%s)\n", mpc->dev->name);
1294
1295        if (memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)) {
1296                pr_info("(%s) wrong MPS\n", mpc->dev->name);
1297                return;
1298        }
1299
1300        /* FIXME: This knows too much of the cache structure */
1301        read_lock_irq(&mpc->egress_lock);
1302        entry = mpc->eg_cache;
1303        while (entry != NULL) {
1304                purge_egress_shortcut(entry->shortcut, entry);
1305                entry = entry->next;
1306        }
1307        read_unlock_irq(&mpc->egress_lock);
1308
1309        mpc->in_ops->destroy_cache(mpc);
1310        mpc->eg_ops->destroy_cache(mpc);
1311}
1312
1313static void MPOA_cache_impos_rcvd(struct k_message *msg,
1314                                  struct mpoa_client *mpc)
1315{
1316        uint16_t holding_time;
1317        eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc);
1318
1319        holding_time = msg->content.eg_info.holding_time;
1320        dprintk("(%s) entry = %p, holding_time = %u\n",
1321                mpc->dev->name, entry, holding_time);
1322        if (entry == NULL && holding_time) {
1323                entry = mpc->eg_ops->add_entry(msg, mpc);
1324                mpc->eg_ops->put(entry);
1325                return;
1326        }
1327        if (holding_time) {
1328                mpc->eg_ops->update(entry, holding_time);
1329                return;
1330        }
1331
1332        write_lock_irq(&mpc->egress_lock);
1333        mpc->eg_ops->remove_entry(entry, mpc);
1334        write_unlock_irq(&mpc->egress_lock);
1335
1336        mpc->eg_ops->put(entry);
1337}
1338
1339static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg,
1340                                   struct mpoa_client *mpc)
1341{
1342        struct lec_priv *priv;
1343        int i, retval ;
1344
1345        uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN];
1346
1347        tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type  */
1348        tlv[4] = 1 + 1 + ATM_ESA_LEN;  /* length                           */
1349        tlv[5] = 0x02;                 /* MPOA client                      */
1350        tlv[6] = 0x00;                 /* number of MPS MAC addresses      */
1351
1352        memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */
1353        memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN);
1354
1355        dprintk("(%s) setting MPC ctrl ATM address to",
1356                mpc->dev ? mpc->dev->name : "<unknown>");
1357        for (i = 7; i < sizeof(tlv); i++)
1358                dprintk_cont(" %02x", tlv[i]);
1359        dprintk_cont("\n");
1360
1361        if (mpc->dev) {
1362                priv = netdev_priv(mpc->dev);
1363                retval = priv->lane2_ops->associate_req(mpc->dev,
1364                                                        mpc->dev->dev_addr,
1365                                                        tlv, sizeof(tlv));
1366                if (retval == 0)
1367                        pr_info("(%s) MPOA device type TLV association failed\n",
1368                                mpc->dev->name);
1369                retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL);
1370                if (retval < 0)
1371                        pr_info("(%s) targetless LE_ARP request failed\n",
1372                                mpc->dev->name);
1373        }
1374}
1375
1376static void set_mps_mac_addr_rcvd(struct k_message *msg,
1377                                  struct mpoa_client *client)
1378{
1379
1380        if (client->number_of_mps_macs)
1381                kfree(client->mps_macs);
1382        client->number_of_mps_macs = 0;
1383        client->mps_macs = kmemdup(msg->MPS_ctrl, ETH_ALEN, GFP_KERNEL);
1384        if (client->mps_macs == NULL) {
1385                pr_info("out of memory\n");
1386                return;
1387        }
1388        client->number_of_mps_macs = 1;
1389}
1390
1391/*
1392 * purge egress cache and tell daemon to 'action' (DIE, RELOAD)
1393 */
1394static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
1395{
1396
1397        eg_cache_entry *entry;
1398        msg->type = SND_EGRESS_PURGE;
1399
1400
1401        /* FIXME: This knows too much of the cache structure */
1402        read_lock_irq(&mpc->egress_lock);
1403        entry = mpc->eg_cache;
1404        while (entry != NULL) {
1405                msg->content.eg_info = entry->ctrl_info;
1406                dprintk("cache_id %u\n", entry->ctrl_info.cache_id);
1407                msg_to_mpoad(msg, mpc);
1408                entry = entry->next;
1409        }
1410        read_unlock_irq(&mpc->egress_lock);
1411
1412        msg->type = action;
1413        msg_to_mpoad(msg, mpc);
1414}
1415
1416static void mpc_timer_refresh(void)
1417{
1418        mpc_timer.expires = jiffies + (MPC_P2 * HZ);
1419        mpc_timer.data = mpc_timer.expires;
1420        mpc_timer.function = mpc_cache_check;
1421        add_timer(&mpc_timer);
1422}
1423
1424static void mpc_cache_check(unsigned long checking_time)
1425{
1426        struct mpoa_client *mpc = mpcs;
1427        static unsigned long previous_resolving_check_time;
1428        static unsigned long previous_refresh_time;
1429
1430        while (mpc != NULL) {
1431                mpc->in_ops->clear_count(mpc);
1432                mpc->eg_ops->clear_expired(mpc);
1433                if (checking_time - previous_resolving_check_time >
1434                    mpc->parameters.mpc_p4 * HZ) {
1435                        mpc->in_ops->check_resolving(mpc);
1436                        previous_resolving_check_time = checking_time;
1437                }
1438                if (checking_time - previous_refresh_time >
1439                    mpc->parameters.mpc_p5 * HZ) {
1440                        mpc->in_ops->refresh(mpc);
1441                        previous_refresh_time = checking_time;
1442                }
1443                mpc = mpc->next;
1444        }
1445        mpc_timer_refresh();
1446}
1447
1448static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd,
1449                          unsigned long arg)
1450{
1451        int err = 0;
1452        struct atm_vcc *vcc = ATM_SD(sock);
1453
1454        if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA)
1455                return -ENOIOCTLCMD;
1456
1457        if (!capable(CAP_NET_ADMIN))
1458                return -EPERM;
1459
1460        switch (cmd) {
1461        case ATMMPC_CTRL:
1462                err = atm_mpoa_mpoad_attach(vcc, (int)arg);
1463                if (err >= 0)
1464                        sock->state = SS_CONNECTED;
1465                break;
1466        case ATMMPC_DATA:
1467                err = atm_mpoa_vcc_attach(vcc, (void __user *)arg);
1468                break;
1469        default:
1470                break;
1471        }
1472        return err;
1473}
1474
1475static struct atm_ioctl atm_ioctl_ops = {
1476        .owner  = THIS_MODULE,
1477        .ioctl  = atm_mpoa_ioctl,
1478};
1479
1480static __init int atm_mpoa_init(void)
1481{
1482        register_atm_ioctl(&atm_ioctl_ops);
1483
1484        if (mpc_proc_init() != 0)
1485                pr_info("failed to initialize /proc/mpoa\n");
1486
1487        pr_info("mpc.c: " __DATE__ " " __TIME__ " initialized\n");
1488
1489        return 0;
1490}
1491
1492static void __exit atm_mpoa_cleanup(void)
1493{
1494        struct mpoa_client *mpc, *tmp;
1495        struct atm_mpoa_qos *qos, *nextqos;
1496        struct lec_priv *priv;
1497
1498        mpc_proc_clean();
1499
1500        del_timer(&mpc_timer);
1501        unregister_netdevice_notifier(&mpoa_notifier);
1502        deregister_atm_ioctl(&atm_ioctl_ops);
1503
1504        mpc = mpcs;
1505        mpcs = NULL;
1506        while (mpc != NULL) {
1507                tmp = mpc->next;
1508                if (mpc->dev != NULL) {
1509                        stop_mpc(mpc);
1510                        priv = netdev_priv(mpc->dev);
1511                        if (priv->lane2_ops != NULL)
1512                                priv->lane2_ops->associate_indicator = NULL;
1513                }
1514                ddprintk("about to clear caches\n");
1515                mpc->in_ops->destroy_cache(mpc);
1516                mpc->eg_ops->destroy_cache(mpc);
1517                ddprintk("caches cleared\n");
1518                kfree(mpc->mps_macs);
1519                memset(mpc, 0, sizeof(struct mpoa_client));
1520                ddprintk("about to kfree %p\n", mpc);
1521                kfree(mpc);
1522                ddprintk("next mpc is at %p\n", tmp);
1523                mpc = tmp;
1524        }
1525
1526        qos = qos_head;
1527        qos_head = NULL;
1528        while (qos != NULL) {
1529                nextqos = qos->next;
1530                dprintk("freeing qos entry %p\n", qos);
1531                kfree(qos);
1532                qos = nextqos;
1533        }
1534}
1535
1536module_init(atm_mpoa_init);
1537module_exit(atm_mpoa_cleanup);
1538
1539MODULE_LICENSE("GPL");
1540