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