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