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(uint32_t 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(uint32_t 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(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 uint32_t ipaddr = 0; 464 465 static struct { 466 struct llc_snap_hdr hdr; 467 uint32_t 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 memcpy(skb->data, &tagged_llc_snap_hdr, sizeof(tagged_llc_snap_hdr)); 508 } else { 509 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */ 510 skb_push(skb, sizeof(struct llc_snap_hdr)); /* add LLC/SNAP header + tag */ 511 memcpy(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr)); 512 } 513 514 atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc); 515 ATM_SKB(skb)->atm_options = entry->shortcut->atm_options; 516 entry->shortcut->send(entry->shortcut, skb); 517 entry->packets_fwded++; 518 mpc->in_ops->put(entry); 519 520 return 0; 521 } 522 523 /* 524 * Probably needs some error checks and locking, not sure... 525 */ 526 static int mpc_send_packet(struct sk_buff *skb, struct net_device *dev) 527 { 528 int retval; 529 struct mpoa_client *mpc; 530 struct ethhdr *eth; 531 int i = 0; 532 533 mpc = find_mpc_by_lec(dev); /* this should NEVER fail */ 534 if(mpc == NULL) { 535 printk("mpoa: (%s) mpc_send_packet: no MPC found\n", dev->name); 536 goto non_ip; 537 } 538 539 eth = (struct ethhdr *)skb->data; 540 if (eth->h_proto != htons(ETH_P_IP)) 541 goto non_ip; /* Multi-Protocol Over ATM :-) */ 542 543 while (i < mpc->number_of_mps_macs) { 544 if (!compare_ether_addr(eth->h_dest, (mpc->mps_macs + i*ETH_ALEN))) 545 if ( send_via_shortcut(skb, mpc) == 0 ) /* try shortcut */ 546 return 0; /* success! */ 547 i++; 548 } 549 550 non_ip: 551 retval = mpc->old_hard_start_xmit(skb,dev); 552 553 return retval; 554 } 555 556 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg) 557 { 558 int bytes_left; 559 struct mpoa_client *mpc; 560 struct atmmpc_ioc ioc_data; 561 in_cache_entry *in_entry; 562 uint32_t ipaddr; 563 unsigned char *ip; 564 565 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc)); 566 if (bytes_left != 0) { 567 printk("mpoa: mpc_vcc_attach: Short read (missed %d bytes) from userland\n", bytes_left); 568 return -EFAULT; 569 } 570 ipaddr = ioc_data.ipaddr; 571 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF) 572 return -EINVAL; 573 574 mpc = find_mpc_by_itfnum(ioc_data.dev_num); 575 if (mpc == NULL) 576 return -EINVAL; 577 578 if (ioc_data.type == MPC_SOCKET_INGRESS) { 579 in_entry = mpc->in_ops->get(ipaddr, mpc); 580 if (in_entry == NULL || in_entry->entry_state < INGRESS_RESOLVED) { 581 printk("mpoa: (%s) mpc_vcc_attach: did not find RESOLVED entry from ingress cache\n", 582 mpc->dev->name); 583 if (in_entry != NULL) mpc->in_ops->put(in_entry); 584 return -EINVAL; 585 } 586 ip = (unsigned char*)&in_entry->ctrl_info.in_dst_ip; 587 printk("mpoa: (%s) mpc_vcc_attach: attaching ingress SVC, entry = %u.%u.%u.%u\n", 588 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]); 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 unsigned char *ip __attribute__ ((unused)) = 620 (unsigned char *)&in_entry->ctrl_info.in_dst_ip; 621 dprintk("mpoa: (%s) mpc_vcc_close: ingress SVC closed ip = %u.%u.%u.%u\n", 622 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]); 623 in_entry->shortcut = NULL; 624 mpc->in_ops->put(in_entry); 625 } 626 eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc); 627 if (eg_entry) { 628 dprintk("mpoa: (%s) mpc_vcc_close: egress SVC closed\n", mpc->dev->name); 629 eg_entry->shortcut = NULL; 630 mpc->eg_ops->put(eg_entry); 631 } 632 633 if (in_entry == NULL && eg_entry == NULL) 634 dprintk("mpoa: (%s) mpc_vcc_close: unused vcc closed\n", dev->name); 635 636 return; 637 } 638 639 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb) 640 { 641 struct net_device *dev = (struct net_device *)vcc->proto_data; 642 struct sk_buff *new_skb; 643 eg_cache_entry *eg; 644 struct mpoa_client *mpc; 645 uint32_t tag; 646 char *tmp; 647 648 ddprintk("mpoa: (%s) mpc_push:\n", dev->name); 649 if (skb == NULL) { 650 dprintk("mpoa: (%s) mpc_push: null skb, closing VCC\n", dev->name); 651 mpc_vcc_close(vcc, dev); 652 return; 653 } 654 655 skb->dev = dev; 656 if (memcmp(skb->data, &llc_snap_mpoa_ctrl, sizeof(struct llc_snap_hdr)) == 0) { 657 struct sock *sk = sk_atm(vcc); 658 659 dprintk("mpoa: (%s) mpc_push: control packet arrived\n", dev->name); 660 /* Pass control packets to daemon */ 661 skb_queue_tail(&sk->sk_receive_queue, skb); 662 sk->sk_data_ready(sk, skb->len); 663 return; 664 } 665 666 /* data coming over the shortcut */ 667 atm_return(vcc, skb->truesize); 668 669 mpc = find_mpc_by_lec(dev); 670 if (mpc == NULL) { 671 printk("mpoa: (%s) mpc_push: unknown MPC\n", dev->name); 672 return; 673 } 674 675 if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */ 676 ddprintk("mpoa: (%s) mpc_push: tagged data packet arrived\n", dev->name); 677 678 } else if (memcmp(skb->data, &llc_snap_mpoa_data, sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */ 679 printk("mpoa: (%s) mpc_push: non-tagged data packet arrived\n", dev->name); 680 printk(" mpc_push: non-tagged data unsupported, purging\n"); 681 dev_kfree_skb_any(skb); 682 return; 683 } else { 684 printk("mpoa: (%s) mpc_push: garbage arrived, purging\n", dev->name); 685 dev_kfree_skb_any(skb); 686 return; 687 } 688 689 tmp = skb->data + sizeof(struct llc_snap_hdr); 690 tag = *(uint32_t *)tmp; 691 692 eg = mpc->eg_ops->get_by_tag(tag, mpc); 693 if (eg == NULL) { 694 printk("mpoa: (%s) mpc_push: Didn't find egress cache entry, tag = %u\n", 695 dev->name,tag); 696 purge_egress_shortcut(vcc, NULL); 697 dev_kfree_skb_any(skb); 698 return; 699 } 700 701 /* 702 * See if ingress MPC is using shortcut we opened as a return channel. 703 * This means we have a bi-directional vcc opened by us. 704 */ 705 if (eg->shortcut == NULL) { 706 eg->shortcut = vcc; 707 printk("mpoa: (%s) mpc_push: egress SVC in use\n", dev->name); 708 } 709 710 skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); /* get rid of LLC/SNAP header */ 711 new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); /* LLC/SNAP is shorter than MAC header :( */ 712 dev_kfree_skb_any(skb); 713 if (new_skb == NULL){ 714 mpc->eg_ops->put(eg); 715 return; 716 } 717 skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */ 718 memcpy(new_skb->data, eg->ctrl_info.DLL_header, eg->ctrl_info.DH_length); 719 new_skb->protocol = eth_type_trans(new_skb, dev); 720 new_skb->nh.raw = new_skb->data; 721 722 eg->latest_ip_addr = new_skb->nh.iph->saddr; 723 eg->packets_rcvd++; 724 mpc->eg_ops->put(eg); 725 726 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 727 netif_rx(new_skb); 728 729 return; 730 } 731 732 static struct atmdev_ops mpc_ops = { /* only send is required */ 733 .close = mpoad_close, 734 .send = msg_from_mpoad 735 }; 736 737 static struct atm_dev mpc_dev = { 738 .ops = &mpc_ops, 739 .type = "mpc", 740 .number = 42, 741 .lock = SPIN_LOCK_UNLOCKED 742 /* members not explicitly initialised will be 0 */ 743 }; 744 745 static int atm_mpoa_mpoad_attach (struct atm_vcc *vcc, int arg) 746 { 747 struct mpoa_client *mpc; 748 struct lec_priv *priv; 749 int err; 750 751 if (mpcs == NULL) { 752 init_timer(&mpc_timer); 753 mpc_timer_refresh(); 754 755 /* This lets us now how our LECs are doing */ 756 err = register_netdevice_notifier(&mpoa_notifier); 757 if (err < 0) { 758 del_timer(&mpc_timer); 759 return err; 760 } 761 } 762 763 mpc = find_mpc_by_itfnum(arg); 764 if (mpc == NULL) { 765 dprintk("mpoa: mpoad_attach: allocating new mpc for itf %d\n", arg); 766 mpc = alloc_mpc(); 767 if (mpc == NULL) 768 return -ENOMEM; 769 mpc->dev_num = arg; 770 mpc->dev = find_lec_by_itfnum(arg); /* NULL if there was no lec */ 771 } 772 if (mpc->mpoad_vcc) { 773 printk("mpoa: mpoad_attach: mpoad is already present for itf %d\n", arg); 774 return -EADDRINUSE; 775 } 776 777 if (mpc->dev) { /* check if the lec is LANE2 capable */ 778 priv = (struct lec_priv *)mpc->dev->priv; 779 if (priv->lane_version < 2) { 780 dev_put(mpc->dev); 781 mpc->dev = NULL; 782 } else 783 priv->lane2_ops->associate_indicator = lane2_assoc_ind; 784 } 785 786 mpc->mpoad_vcc = vcc; 787 vcc->dev = &mpc_dev; 788 vcc_insert_socket(sk_atm(vcc)); 789 set_bit(ATM_VF_META,&vcc->flags); 790 set_bit(ATM_VF_READY,&vcc->flags); 791 792 if (mpc->dev) { 793 char empty[ATM_ESA_LEN]; 794 memset(empty, 0, ATM_ESA_LEN); 795 796 start_mpc(mpc, mpc->dev); 797 /* set address if mpcd e.g. gets killed and restarted. 798 * If we do not do it now we have to wait for the next LE_ARP 799 */ 800 if ( memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0 ) 801 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc); 802 } 803 804 __module_get(THIS_MODULE); 805 return arg; 806 } 807 808 static void send_set_mps_ctrl_addr(char *addr, struct mpoa_client *mpc) 809 { 810 struct k_message mesg; 811 812 memcpy (mpc->mps_ctrl_addr, addr, ATM_ESA_LEN); 813 814 mesg.type = SET_MPS_CTRL_ADDR; 815 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN); 816 msg_to_mpoad(&mesg, mpc); 817 818 return; 819 } 820 821 static void mpoad_close(struct atm_vcc *vcc) 822 { 823 struct mpoa_client *mpc; 824 struct sk_buff *skb; 825 826 mpc = find_mpc_by_vcc(vcc); 827 if (mpc == NULL) { 828 printk("mpoa: mpoad_close: did not find MPC\n"); 829 return; 830 } 831 if (!mpc->mpoad_vcc) { 832 printk("mpoa: mpoad_close: close for non-present mpoad\n"); 833 return; 834 } 835 836 mpc->mpoad_vcc = NULL; 837 if (mpc->dev) { 838 struct lec_priv *priv = (struct lec_priv *)mpc->dev->priv; 839 priv->lane2_ops->associate_indicator = NULL; 840 stop_mpc(mpc); 841 dev_put(mpc->dev); 842 } 843 844 mpc->in_ops->destroy_cache(mpc); 845 mpc->eg_ops->destroy_cache(mpc); 846 847 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) { 848 atm_return(vcc, skb->truesize); 849 kfree_skb(skb); 850 } 851 852 printk("mpoa: (%s) going down\n", 853 (mpc->dev) ? mpc->dev->name : "<unknown>"); 854 module_put(THIS_MODULE); 855 856 return; 857 } 858 859 /* 860 * 861 */ 862 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb) 863 { 864 865 struct mpoa_client *mpc = find_mpc_by_vcc(vcc); 866 struct k_message *mesg = (struct k_message*)skb->data; 867 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); 868 869 if (mpc == NULL) { 870 printk("mpoa: msg_from_mpoad: no mpc found\n"); 871 return 0; 872 } 873 dprintk("mpoa: (%s) msg_from_mpoad:", (mpc->dev) ? mpc->dev->name : "<unknown>"); 874 switch(mesg->type) { 875 case MPOA_RES_REPLY_RCVD: 876 dprintk(" mpoa_res_reply_rcvd\n"); 877 MPOA_res_reply_rcvd(mesg, mpc); 878 break; 879 case MPOA_TRIGGER_RCVD: 880 dprintk(" mpoa_trigger_rcvd\n"); 881 MPOA_trigger_rcvd(mesg, mpc); 882 break; 883 case INGRESS_PURGE_RCVD: 884 dprintk(" nhrp_purge_rcvd\n"); 885 ingress_purge_rcvd(mesg, mpc); 886 break; 887 case EGRESS_PURGE_RCVD: 888 dprintk(" egress_purge_reply_rcvd\n"); 889 egress_purge_rcvd(mesg, mpc); 890 break; 891 case MPS_DEATH: 892 dprintk(" mps_death\n"); 893 mps_death(mesg, mpc); 894 break; 895 case CACHE_IMPOS_RCVD: 896 dprintk(" cache_impos_rcvd\n"); 897 MPOA_cache_impos_rcvd(mesg, mpc); 898 break; 899 case SET_MPC_CTRL_ADDR: 900 dprintk(" set_mpc_ctrl_addr\n"); 901 set_mpc_ctrl_addr_rcvd(mesg, mpc); 902 break; 903 case SET_MPS_MAC_ADDR: 904 dprintk(" set_mps_mac_addr\n"); 905 set_mps_mac_addr_rcvd(mesg, mpc); 906 break; 907 case CLEAN_UP_AND_EXIT: 908 dprintk(" clean_up_and_exit\n"); 909 clean_up(mesg, mpc, DIE); 910 break; 911 case RELOAD: 912 dprintk(" reload\n"); 913 clean_up(mesg, mpc, RELOAD); 914 break; 915 case SET_MPC_PARAMS: 916 dprintk(" set_mpc_params\n"); 917 mpc->parameters = mesg->content.params; 918 break; 919 default: 920 dprintk(" unknown message %d\n", mesg->type); 921 break; 922 } 923 kfree_skb(skb); 924 925 return 0; 926 } 927 928 /* Remember that this function may not do things that sleep */ 929 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc) 930 { 931 struct sk_buff *skb; 932 struct sock *sk; 933 934 if (mpc == NULL || !mpc->mpoad_vcc) { 935 printk("mpoa: msg_to_mpoad: mesg %d to a non-existent mpoad\n", mesg->type); 936 return -ENXIO; 937 } 938 939 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC); 940 if (skb == NULL) 941 return -ENOMEM; 942 skb_put(skb, sizeof(struct k_message)); 943 memcpy(skb->data, mesg, sizeof(struct k_message)); 944 atm_force_charge(mpc->mpoad_vcc, skb->truesize); 945 946 sk = sk_atm(mpc->mpoad_vcc); 947 skb_queue_tail(&sk->sk_receive_queue, skb); 948 sk->sk_data_ready(sk, skb->len); 949 950 return 0; 951 } 952 953 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned long event, void *dev_ptr) 954 { 955 struct net_device *dev; 956 struct mpoa_client *mpc; 957 struct lec_priv *priv; 958 959 dev = (struct net_device *)dev_ptr; 960 if (dev->name == NULL || strncmp(dev->name, "lec", 3)) 961 return NOTIFY_DONE; /* we are only interested in lec:s */ 962 963 switch (event) { 964 case NETDEV_REGISTER: /* a new lec device was allocated */ 965 priv = (struct lec_priv *)dev->priv; 966 if (priv->lane_version < 2) 967 break; 968 priv->lane2_ops->associate_indicator = lane2_assoc_ind; 969 mpc = find_mpc_by_itfnum(priv->itfnum); 970 if (mpc == NULL) { 971 dprintk("mpoa: mpoa_event_listener: allocating new mpc for %s\n", 972 dev->name); 973 mpc = alloc_mpc(); 974 if (mpc == NULL) { 975 printk("mpoa: mpoa_event_listener: no new mpc"); 976 break; 977 } 978 } 979 mpc->dev_num = priv->itfnum; 980 mpc->dev = dev; 981 dev_hold(dev); 982 dprintk("mpoa: (%s) was initialized\n", dev->name); 983 break; 984 case NETDEV_UNREGISTER: 985 /* the lec device was deallocated */ 986 mpc = find_mpc_by_lec(dev); 987 if (mpc == NULL) 988 break; 989 dprintk("mpoa: device (%s) was deallocated\n", dev->name); 990 stop_mpc(mpc); 991 dev_put(mpc->dev); 992 mpc->dev = NULL; 993 break; 994 case NETDEV_UP: 995 /* the dev was ifconfig'ed up */ 996 mpc = find_mpc_by_lec(dev); 997 if (mpc == NULL) 998 break; 999 if (mpc->mpoad_vcc != NULL) { 1000 start_mpc(mpc, dev); 1001 } 1002 break; 1003 case NETDEV_DOWN: 1004 /* the dev was ifconfig'ed down */ 1005 /* this means that the flow of packets from the 1006 * upper layer stops 1007 */ 1008 mpc = find_mpc_by_lec(dev); 1009 if (mpc == NULL) 1010 break; 1011 if (mpc->mpoad_vcc != NULL) { 1012 stop_mpc(mpc); 1013 } 1014 break; 1015 case NETDEV_REBOOT: 1016 case NETDEV_CHANGE: 1017 case NETDEV_CHANGEMTU: 1018 case NETDEV_CHANGEADDR: 1019 case NETDEV_GOING_DOWN: 1020 break; 1021 default: 1022 break; 1023 } 1024 1025 return NOTIFY_DONE; 1026 } 1027 1028 /* 1029 * Functions which are called after a message is received from mpcd. 1030 * Msg is reused on purpose. 1031 */ 1032 1033 1034 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1035 { 1036 uint32_t dst_ip = msg->content.in_info.in_dst_ip; 1037 in_cache_entry *entry; 1038 1039 entry = mpc->in_ops->get(dst_ip, mpc); 1040 if(entry == NULL){ 1041 entry = mpc->in_ops->add_entry(dst_ip, mpc); 1042 entry->entry_state = INGRESS_RESOLVING; 1043 msg->type = SND_MPOA_RES_RQST; 1044 msg->content.in_info = entry->ctrl_info; 1045 msg_to_mpoad(msg, mpc); 1046 do_gettimeofday(&(entry->reply_wait)); 1047 mpc->in_ops->put(entry); 1048 return; 1049 } 1050 1051 if(entry->entry_state == INGRESS_INVALID){ 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 printk("mpoa: (%s) MPOA_trigger_rcvd: entry already in resolving state\n", 1062 (mpc->dev) ? mpc->dev->name : "<unknown>"); 1063 mpc->in_ops->put(entry); 1064 return; 1065 } 1066 1067 /* 1068 * Things get complicated because we have to check if there's an egress 1069 * shortcut with suitable traffic parameters we could use. 1070 */ 1071 static void check_qos_and_open_shortcut(struct k_message *msg, struct mpoa_client *client, in_cache_entry *entry) 1072 { 1073 uint32_t dst_ip = msg->content.in_info.in_dst_ip; 1074 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip); 1075 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client); 1076 1077 if(eg_entry && eg_entry->shortcut){ 1078 if(eg_entry->shortcut->qos.txtp.traffic_class & 1079 msg->qos.txtp.traffic_class & 1080 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)){ 1081 if(eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR) 1082 entry->shortcut = eg_entry->shortcut; 1083 else if(eg_entry->shortcut->qos.txtp.max_pcr > 0) 1084 entry->shortcut = eg_entry->shortcut; 1085 } 1086 if(entry->shortcut){ 1087 dprintk("mpoa: (%s) using egress SVC to reach %u.%u.%u.%u\n",client->dev->name, NIPQUAD(dst_ip)); 1088 client->eg_ops->put(eg_entry); 1089 return; 1090 } 1091 } 1092 if (eg_entry != NULL) 1093 client->eg_ops->put(eg_entry); 1094 1095 /* No luck in the egress cache we must open an ingress SVC */ 1096 msg->type = OPEN_INGRESS_SVC; 1097 if (qos && (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class)) 1098 { 1099 msg->qos = qos->qos; 1100 printk("mpoa: (%s) trying to get a CBR shortcut\n",client->dev->name); 1101 } 1102 else memset(&msg->qos,0,sizeof(struct atm_qos)); 1103 msg_to_mpoad(msg, client); 1104 return; 1105 } 1106 1107 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1108 { 1109 uint32_t dst_ip = msg->content.in_info.in_dst_ip; 1110 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc); 1111 1112 dprintk("mpoa: (%s) MPOA_res_reply_rcvd: ip %u.%u.%u.%u\n", mpc->dev->name, NIPQUAD(dst_ip)); 1113 ddprintk("mpoa: (%s) MPOA_res_reply_rcvd() entry = %p", mpc->dev->name, entry); 1114 if(entry == NULL){ 1115 printk("\nmpoa: (%s) ARGH, received res. reply for an entry that doesn't exist.\n", mpc->dev->name); 1116 return; 1117 } 1118 ddprintk(" entry_state = %d ", entry->entry_state); 1119 1120 if (entry->entry_state == INGRESS_RESOLVED) { 1121 printk("\nmpoa: (%s) MPOA_res_reply_rcvd for RESOLVED entry!\n", mpc->dev->name); 1122 mpc->in_ops->put(entry); 1123 return; 1124 } 1125 1126 entry->ctrl_info = msg->content.in_info; 1127 do_gettimeofday(&(entry->tv)); 1128 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */ 1129 entry->refresh_time = 0; 1130 ddprintk("entry->shortcut = %p\n", entry->shortcut); 1131 1132 if(entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL){ 1133 entry->entry_state = INGRESS_RESOLVED; 1134 mpc->in_ops->put(entry); 1135 return; /* Shortcut already open... */ 1136 } 1137 1138 if (entry->shortcut != NULL) { 1139 printk("mpoa: (%s) MPOA_res_reply_rcvd: entry->shortcut != NULL, impossible!\n", 1140 mpc->dev->name); 1141 mpc->in_ops->put(entry); 1142 return; 1143 } 1144 1145 check_qos_and_open_shortcut(msg, mpc, entry); 1146 entry->entry_state = INGRESS_RESOLVED; 1147 mpc->in_ops->put(entry); 1148 1149 return; 1150 1151 } 1152 1153 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1154 { 1155 uint32_t dst_ip = msg->content.in_info.in_dst_ip; 1156 uint32_t mask = msg->ip_mask; 1157 unsigned char *ip = (unsigned char *)&dst_ip; 1158 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask); 1159 1160 if(entry == NULL){ 1161 printk("mpoa: (%s) ingress_purge_rcvd: purge for a non-existing entry, ", mpc->dev->name); 1162 printk("ip = %u.%u.%u.%u\n", ip[0], ip[1], ip[2], ip[3]); 1163 return; 1164 } 1165 1166 do { 1167 dprintk("mpoa: (%s) ingress_purge_rcvd: removing an ingress entry, ip = %u.%u.%u.%u\n" , 1168 mpc->dev->name, ip[0], ip[1], ip[2], ip[3]); 1169 write_lock_bh(&mpc->ingress_lock); 1170 mpc->in_ops->remove_entry(entry, mpc); 1171 write_unlock_bh(&mpc->ingress_lock); 1172 mpc->in_ops->put(entry); 1173 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask); 1174 } while (entry != NULL); 1175 1176 return; 1177 } 1178 1179 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1180 { 1181 uint32_t cache_id = msg->content.eg_info.cache_id; 1182 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc); 1183 1184 if (entry == NULL) { 1185 dprintk("mpoa: (%s) egress_purge_rcvd: purge for a non-existing entry\n", mpc->dev->name); 1186 return; 1187 } 1188 1189 write_lock_irq(&mpc->egress_lock); 1190 mpc->eg_ops->remove_entry(entry, mpc); 1191 write_unlock_irq(&mpc->egress_lock); 1192 1193 mpc->eg_ops->put(entry); 1194 1195 return; 1196 } 1197 1198 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry) 1199 { 1200 struct sock *sk; 1201 struct k_message *purge_msg; 1202 struct sk_buff *skb; 1203 1204 dprintk("mpoa: purge_egress_shortcut: entering\n"); 1205 if (vcc == NULL) { 1206 printk("mpoa: purge_egress_shortcut: vcc == NULL\n"); 1207 return; 1208 } 1209 1210 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC); 1211 if (skb == NULL) { 1212 printk("mpoa: purge_egress_shortcut: out of memory\n"); 1213 return; 1214 } 1215 1216 skb_put(skb, sizeof(struct k_message)); 1217 memset(skb->data, 0, sizeof(struct k_message)); 1218 purge_msg = (struct k_message *)skb->data; 1219 purge_msg->type = DATA_PLANE_PURGE; 1220 if (entry != NULL) 1221 purge_msg->content.eg_info = entry->ctrl_info; 1222 1223 atm_force_charge(vcc, skb->truesize); 1224 1225 sk = sk_atm(vcc); 1226 skb_queue_tail(&sk->sk_receive_queue, skb); 1227 sk->sk_data_ready(sk, skb->len); 1228 dprintk("mpoa: purge_egress_shortcut: exiting:\n"); 1229 1230 return; 1231 } 1232 1233 /* 1234 * Our MPS died. Tell our daemon to send NHRP data plane purge to each 1235 * of the egress shortcuts we have. 1236 */ 1237 static void mps_death( struct k_message * msg, struct mpoa_client * mpc ) 1238 { 1239 eg_cache_entry *entry; 1240 1241 dprintk("mpoa: (%s) mps_death:\n", mpc->dev->name); 1242 1243 if(memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)){ 1244 printk("mpoa: (%s) mps_death: wrong MPS\n", mpc->dev->name); 1245 return; 1246 } 1247 1248 /* FIXME: This knows too much of the cache structure */ 1249 read_lock_irq(&mpc->egress_lock); 1250 entry = mpc->eg_cache; 1251 while (entry != NULL) { 1252 purge_egress_shortcut(entry->shortcut, entry); 1253 entry = entry->next; 1254 } 1255 read_unlock_irq(&mpc->egress_lock); 1256 1257 mpc->in_ops->destroy_cache(mpc); 1258 mpc->eg_ops->destroy_cache(mpc); 1259 1260 return; 1261 } 1262 1263 static void MPOA_cache_impos_rcvd( struct k_message * msg, struct mpoa_client * mpc) 1264 { 1265 uint16_t holding_time; 1266 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc); 1267 1268 holding_time = msg->content.eg_info.holding_time; 1269 dprintk("mpoa: (%s) MPOA_cache_impos_rcvd: entry = %p, holding_time = %u\n", 1270 mpc->dev->name, entry, holding_time); 1271 if(entry == NULL && holding_time) { 1272 entry = mpc->eg_ops->add_entry(msg, mpc); 1273 mpc->eg_ops->put(entry); 1274 return; 1275 } 1276 if(holding_time){ 1277 mpc->eg_ops->update(entry, holding_time); 1278 return; 1279 } 1280 1281 write_lock_irq(&mpc->egress_lock); 1282 mpc->eg_ops->remove_entry(entry, mpc); 1283 write_unlock_irq(&mpc->egress_lock); 1284 1285 mpc->eg_ops->put(entry); 1286 1287 return; 1288 } 1289 1290 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, struct mpoa_client *mpc) 1291 { 1292 struct lec_priv *priv; 1293 int i, retval ; 1294 1295 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN]; 1296 1297 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */ 1298 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */ 1299 tlv[5] = 0x02; /* MPOA client */ 1300 tlv[6] = 0x00; /* number of MPS MAC addresses */ 1301 1302 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */ 1303 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN); 1304 1305 dprintk("mpoa: (%s) setting MPC ctrl ATM address to ", 1306 (mpc->dev) ? mpc->dev->name : "<unknown>"); 1307 for (i = 7; i < sizeof(tlv); i++) 1308 dprintk("%02x ", tlv[i]); 1309 dprintk("\n"); 1310 1311 if (mpc->dev) { 1312 priv = (struct lec_priv *)mpc->dev->priv; 1313 retval = priv->lane2_ops->associate_req(mpc->dev, mpc->dev->dev_addr, tlv, sizeof(tlv)); 1314 if (retval == 0) 1315 printk("mpoa: (%s) MPOA device type TLV association failed\n", mpc->dev->name); 1316 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL); 1317 if (retval < 0) 1318 printk("mpoa: (%s) targetless LE_ARP request failed\n", mpc->dev->name); 1319 } 1320 1321 return; 1322 } 1323 1324 static void set_mps_mac_addr_rcvd(struct k_message *msg, struct mpoa_client *client) 1325 { 1326 1327 if(client->number_of_mps_macs) 1328 kfree(client->mps_macs); 1329 client->number_of_mps_macs = 0; 1330 client->mps_macs = kmalloc(ETH_ALEN,GFP_KERNEL); 1331 if (client->mps_macs == NULL) { 1332 printk("mpoa: set_mps_mac_addr_rcvd: out of memory\n"); 1333 return; 1334 } 1335 client->number_of_mps_macs = 1; 1336 memcpy(client->mps_macs, msg->MPS_ctrl, ETH_ALEN); 1337 1338 return; 1339 } 1340 1341 /* 1342 * purge egress cache and tell daemon to 'action' (DIE, RELOAD) 1343 */ 1344 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action) 1345 { 1346 1347 eg_cache_entry *entry; 1348 msg->type = SND_EGRESS_PURGE; 1349 1350 1351 /* FIXME: This knows too much of the cache structure */ 1352 read_lock_irq(&mpc->egress_lock); 1353 entry = mpc->eg_cache; 1354 while (entry != NULL){ 1355 msg->content.eg_info = entry->ctrl_info; 1356 dprintk("mpoa: cache_id %u\n", entry->ctrl_info.cache_id); 1357 msg_to_mpoad(msg, mpc); 1358 entry = entry->next; 1359 } 1360 read_unlock_irq(&mpc->egress_lock); 1361 1362 msg->type = action; 1363 msg_to_mpoad(msg, mpc); 1364 return; 1365 } 1366 1367 static void mpc_timer_refresh(void) 1368 { 1369 mpc_timer.expires = jiffies + (MPC_P2 * HZ); 1370 mpc_timer.data = mpc_timer.expires; 1371 mpc_timer.function = mpc_cache_check; 1372 add_timer(&mpc_timer); 1373 1374 return; 1375 } 1376 1377 static void mpc_cache_check( unsigned long checking_time ) 1378 { 1379 struct mpoa_client *mpc = mpcs; 1380 static unsigned long previous_resolving_check_time; 1381 static unsigned long previous_refresh_time; 1382 1383 while( mpc != NULL ){ 1384 mpc->in_ops->clear_count(mpc); 1385 mpc->eg_ops->clear_expired(mpc); 1386 if(checking_time - previous_resolving_check_time > mpc->parameters.mpc_p4 * HZ ){ 1387 mpc->in_ops->check_resolving(mpc); 1388 previous_resolving_check_time = checking_time; 1389 } 1390 if(checking_time - previous_refresh_time > mpc->parameters.mpc_p5 * HZ ){ 1391 mpc->in_ops->refresh(mpc); 1392 previous_refresh_time = checking_time; 1393 } 1394 mpc = mpc->next; 1395 } 1396 mpc_timer_refresh(); 1397 1398 return; 1399 } 1400 1401 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1402 { 1403 int err = 0; 1404 struct atm_vcc *vcc = ATM_SD(sock); 1405 1406 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA) 1407 return -ENOIOCTLCMD; 1408 1409 if (!capable(CAP_NET_ADMIN)) 1410 return -EPERM; 1411 1412 switch (cmd) { 1413 case ATMMPC_CTRL: 1414 err = atm_mpoa_mpoad_attach(vcc, (int)arg); 1415 if (err >= 0) 1416 sock->state = SS_CONNECTED; 1417 break; 1418 case ATMMPC_DATA: 1419 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg); 1420 break; 1421 default: 1422 break; 1423 } 1424 return err; 1425 } 1426 1427 1428 static struct atm_ioctl atm_ioctl_ops = { 1429 .owner = THIS_MODULE, 1430 .ioctl = atm_mpoa_ioctl, 1431 }; 1432 1433 static __init int atm_mpoa_init(void) 1434 { 1435 register_atm_ioctl(&atm_ioctl_ops); 1436 1437 if (mpc_proc_init() != 0) 1438 printk(KERN_INFO "mpoa: failed to initialize /proc/mpoa\n"); 1439 1440 printk("mpc.c: " __DATE__ " " __TIME__ " initialized\n"); 1441 1442 return 0; 1443 } 1444 1445 static void __exit atm_mpoa_cleanup(void) 1446 { 1447 struct mpoa_client *mpc, *tmp; 1448 struct atm_mpoa_qos *qos, *nextqos; 1449 struct lec_priv *priv; 1450 1451 mpc_proc_clean(); 1452 1453 del_timer(&mpc_timer); 1454 unregister_netdevice_notifier(&mpoa_notifier); 1455 deregister_atm_ioctl(&atm_ioctl_ops); 1456 1457 mpc = mpcs; 1458 mpcs = NULL; 1459 while (mpc != NULL) { 1460 tmp = mpc->next; 1461 if (mpc->dev != NULL) { 1462 stop_mpc(mpc); 1463 priv = (struct lec_priv *)mpc->dev->priv; 1464 if (priv->lane2_ops != NULL) 1465 priv->lane2_ops->associate_indicator = NULL; 1466 } 1467 ddprintk("mpoa: cleanup_module: about to clear caches\n"); 1468 mpc->in_ops->destroy_cache(mpc); 1469 mpc->eg_ops->destroy_cache(mpc); 1470 ddprintk("mpoa: cleanup_module: caches cleared\n"); 1471 kfree(mpc->mps_macs); 1472 memset(mpc, 0, sizeof(struct mpoa_client)); 1473 ddprintk("mpoa: cleanup_module: about to kfree %p\n", mpc); 1474 kfree(mpc); 1475 ddprintk("mpoa: cleanup_module: next mpc is at %p\n", tmp); 1476 mpc = tmp; 1477 } 1478 1479 qos = qos_head; 1480 qos_head = NULL; 1481 while (qos != NULL) { 1482 nextqos = qos->next; 1483 dprintk("mpoa: cleanup_module: freeing qos entry %p\n", qos); 1484 kfree(qos); 1485 qos = nextqos; 1486 } 1487 1488 return; 1489 } 1490 1491 module_init(atm_mpoa_init); 1492 module_exit(atm_mpoa_cleanup); 1493 1494 MODULE_LICENSE("GPL"); 1495