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