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