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 ether_addr_copy(mpc->mps_macs, router_mac); 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 (ether_addr_equal(eth->h_dest, mpc->mps_macs + i * ETH_ALEN)) 596 if (send_via_shortcut(skb, mpc) == 0) /* try shortcut */ 597 return NETDEV_TX_OK; 598 i++; 599 } 600 601 non_ip: 602 return __netdev_start_xmit(mpc->old_ops, skb, dev, false); 603 } 604 605 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg) 606 { 607 int bytes_left; 608 struct mpoa_client *mpc; 609 struct atmmpc_ioc ioc_data; 610 in_cache_entry *in_entry; 611 __be32 ipaddr; 612 613 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc)); 614 if (bytes_left != 0) { 615 pr_info("mpoa:Short read (missed %d bytes) from userland\n", 616 bytes_left); 617 return -EFAULT; 618 } 619 ipaddr = ioc_data.ipaddr; 620 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF) 621 return -EINVAL; 622 623 mpc = find_mpc_by_itfnum(ioc_data.dev_num); 624 if (mpc == NULL) 625 return -EINVAL; 626 627 if (ioc_data.type == MPC_SOCKET_INGRESS) { 628 in_entry = mpc->in_ops->get(ipaddr, mpc); 629 if (in_entry == NULL || 630 in_entry->entry_state < INGRESS_RESOLVED) { 631 pr_info("(%s) did not find RESOLVED entry from ingress cache\n", 632 mpc->dev->name); 633 if (in_entry != NULL) 634 mpc->in_ops->put(in_entry); 635 return -EINVAL; 636 } 637 pr_info("(%s) attaching ingress SVC, entry = %pI4\n", 638 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip); 639 in_entry->shortcut = vcc; 640 mpc->in_ops->put(in_entry); 641 } else { 642 pr_info("(%s) attaching egress SVC\n", mpc->dev->name); 643 } 644 645 vcc->proto_data = mpc->dev; 646 vcc->push = mpc_push; 647 648 return 0; 649 } 650 651 /* 652 * 653 */ 654 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev) 655 { 656 struct mpoa_client *mpc; 657 in_cache_entry *in_entry; 658 eg_cache_entry *eg_entry; 659 660 mpc = find_mpc_by_lec(dev); 661 if (mpc == NULL) { 662 pr_info("(%s) close for unknown MPC\n", dev->name); 663 return; 664 } 665 666 dprintk("(%s)\n", dev->name); 667 in_entry = mpc->in_ops->get_by_vcc(vcc, mpc); 668 if (in_entry) { 669 dprintk("(%s) ingress SVC closed ip = %pI4\n", 670 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip); 671 in_entry->shortcut = NULL; 672 mpc->in_ops->put(in_entry); 673 } 674 eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc); 675 if (eg_entry) { 676 dprintk("(%s) egress SVC closed\n", mpc->dev->name); 677 eg_entry->shortcut = NULL; 678 mpc->eg_ops->put(eg_entry); 679 } 680 681 if (in_entry == NULL && eg_entry == NULL) 682 dprintk("(%s) unused vcc closed\n", dev->name); 683 } 684 685 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb) 686 { 687 struct net_device *dev = (struct net_device *)vcc->proto_data; 688 struct sk_buff *new_skb; 689 eg_cache_entry *eg; 690 struct mpoa_client *mpc; 691 __be32 tag; 692 char *tmp; 693 694 ddprintk("(%s)\n", dev->name); 695 if (skb == NULL) { 696 dprintk("(%s) null skb, closing VCC\n", dev->name); 697 mpc_vcc_close(vcc, dev); 698 return; 699 } 700 701 skb->dev = dev; 702 if (memcmp(skb->data, &llc_snap_mpoa_ctrl, 703 sizeof(struct llc_snap_hdr)) == 0) { 704 struct sock *sk = sk_atm(vcc); 705 706 dprintk("(%s) control packet arrived\n", dev->name); 707 /* Pass control packets to daemon */ 708 skb_queue_tail(&sk->sk_receive_queue, skb); 709 sk->sk_data_ready(sk); 710 return; 711 } 712 713 /* data coming over the shortcut */ 714 atm_return(vcc, skb->truesize); 715 716 mpc = find_mpc_by_lec(dev); 717 if (mpc == NULL) { 718 pr_info("(%s) unknown MPC\n", dev->name); 719 return; 720 } 721 722 if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, 723 sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */ 724 ddprintk("(%s) tagged data packet arrived\n", dev->name); 725 726 } else if (memcmp(skb->data, &llc_snap_mpoa_data, 727 sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */ 728 pr_info("(%s) Unsupported non-tagged data packet arrived. Purging\n", 729 dev->name); 730 dev_kfree_skb_any(skb); 731 return; 732 } else { 733 pr_info("(%s) garbage arrived, purging\n", dev->name); 734 dev_kfree_skb_any(skb); 735 return; 736 } 737 738 tmp = skb->data + sizeof(struct llc_snap_hdr); 739 tag = *(__be32 *)tmp; 740 741 eg = mpc->eg_ops->get_by_tag(tag, mpc); 742 if (eg == NULL) { 743 pr_info("mpoa: (%s) Didn't find egress cache entry, tag = %u\n", 744 dev->name, tag); 745 purge_egress_shortcut(vcc, NULL); 746 dev_kfree_skb_any(skb); 747 return; 748 } 749 750 /* 751 * See if ingress MPC is using shortcut we opened as a return channel. 752 * This means we have a bi-directional vcc opened by us. 753 */ 754 if (eg->shortcut == NULL) { 755 eg->shortcut = vcc; 756 pr_info("(%s) egress SVC in use\n", dev->name); 757 } 758 759 skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); 760 /* get rid of LLC/SNAP header */ 761 new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); 762 /* LLC/SNAP is shorter than MAC header :( */ 763 dev_kfree_skb_any(skb); 764 if (new_skb == NULL) { 765 mpc->eg_ops->put(eg); 766 return; 767 } 768 skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */ 769 skb_copy_to_linear_data(new_skb, eg->ctrl_info.DLL_header, 770 eg->ctrl_info.DH_length); 771 new_skb->protocol = eth_type_trans(new_skb, dev); 772 skb_reset_network_header(new_skb); 773 774 eg->latest_ip_addr = ip_hdr(new_skb)->saddr; 775 eg->packets_rcvd++; 776 mpc->eg_ops->put(eg); 777 778 memset(ATM_SKB(new_skb), 0, sizeof(struct atm_skb_data)); 779 netif_rx(new_skb); 780 } 781 782 static struct atmdev_ops mpc_ops = { /* only send is required */ 783 .close = mpoad_close, 784 .send = msg_from_mpoad 785 }; 786 787 static struct atm_dev mpc_dev = { 788 .ops = &mpc_ops, 789 .type = "mpc", 790 .number = 42, 791 .lock = __SPIN_LOCK_UNLOCKED(mpc_dev.lock) 792 /* members not explicitly initialised will be 0 */ 793 }; 794 795 static int atm_mpoa_mpoad_attach(struct atm_vcc *vcc, int arg) 796 { 797 struct mpoa_client *mpc; 798 struct lec_priv *priv; 799 int err; 800 801 if (mpcs == NULL) { 802 init_timer(&mpc_timer); 803 mpc_timer_refresh(); 804 805 /* This lets us now how our LECs are doing */ 806 err = register_netdevice_notifier(&mpoa_notifier); 807 if (err < 0) { 808 del_timer(&mpc_timer); 809 return err; 810 } 811 } 812 813 mpc = find_mpc_by_itfnum(arg); 814 if (mpc == NULL) { 815 dprintk("allocating new mpc for itf %d\n", arg); 816 mpc = alloc_mpc(); 817 if (mpc == NULL) 818 return -ENOMEM; 819 mpc->dev_num = arg; 820 mpc->dev = find_lec_by_itfnum(arg); 821 /* NULL if there was no lec */ 822 } 823 if (mpc->mpoad_vcc) { 824 pr_info("mpoad is already present for itf %d\n", arg); 825 return -EADDRINUSE; 826 } 827 828 if (mpc->dev) { /* check if the lec is LANE2 capable */ 829 priv = netdev_priv(mpc->dev); 830 if (priv->lane_version < 2) { 831 dev_put(mpc->dev); 832 mpc->dev = NULL; 833 } else 834 priv->lane2_ops->associate_indicator = lane2_assoc_ind; 835 } 836 837 mpc->mpoad_vcc = vcc; 838 vcc->dev = &mpc_dev; 839 vcc_insert_socket(sk_atm(vcc)); 840 set_bit(ATM_VF_META, &vcc->flags); 841 set_bit(ATM_VF_READY, &vcc->flags); 842 843 if (mpc->dev) { 844 char empty[ATM_ESA_LEN]; 845 memset(empty, 0, ATM_ESA_LEN); 846 847 start_mpc(mpc, mpc->dev); 848 /* set address if mpcd e.g. gets killed and restarted. 849 * If we do not do it now we have to wait for the next LE_ARP 850 */ 851 if (memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0) 852 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc); 853 } 854 855 __module_get(THIS_MODULE); 856 return arg; 857 } 858 859 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc) 860 { 861 struct k_message mesg; 862 863 memcpy(mpc->mps_ctrl_addr, addr, ATM_ESA_LEN); 864 865 mesg.type = SET_MPS_CTRL_ADDR; 866 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN); 867 msg_to_mpoad(&mesg, mpc); 868 } 869 870 static void mpoad_close(struct atm_vcc *vcc) 871 { 872 struct mpoa_client *mpc; 873 struct sk_buff *skb; 874 875 mpc = find_mpc_by_vcc(vcc); 876 if (mpc == NULL) { 877 pr_info("did not find MPC\n"); 878 return; 879 } 880 if (!mpc->mpoad_vcc) { 881 pr_info("close for non-present mpoad\n"); 882 return; 883 } 884 885 mpc->mpoad_vcc = NULL; 886 if (mpc->dev) { 887 struct lec_priv *priv = netdev_priv(mpc->dev); 888 priv->lane2_ops->associate_indicator = NULL; 889 stop_mpc(mpc); 890 dev_put(mpc->dev); 891 } 892 893 mpc->in_ops->destroy_cache(mpc); 894 mpc->eg_ops->destroy_cache(mpc); 895 896 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) { 897 atm_return(vcc, skb->truesize); 898 kfree_skb(skb); 899 } 900 901 pr_info("(%s) going down\n", 902 (mpc->dev) ? mpc->dev->name : "<unknown>"); 903 module_put(THIS_MODULE); 904 } 905 906 /* 907 * 908 */ 909 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb) 910 { 911 912 struct mpoa_client *mpc = find_mpc_by_vcc(vcc); 913 struct k_message *mesg = (struct k_message *)skb->data; 914 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); 915 916 if (mpc == NULL) { 917 pr_info("no mpc found\n"); 918 return 0; 919 } 920 dprintk("(%s)", mpc->dev ? mpc->dev->name : "<unknown>"); 921 switch (mesg->type) { 922 case MPOA_RES_REPLY_RCVD: 923 dprintk_cont("mpoa_res_reply_rcvd\n"); 924 MPOA_res_reply_rcvd(mesg, mpc); 925 break; 926 case MPOA_TRIGGER_RCVD: 927 dprintk_cont("mpoa_trigger_rcvd\n"); 928 MPOA_trigger_rcvd(mesg, mpc); 929 break; 930 case INGRESS_PURGE_RCVD: 931 dprintk_cont("nhrp_purge_rcvd\n"); 932 ingress_purge_rcvd(mesg, mpc); 933 break; 934 case EGRESS_PURGE_RCVD: 935 dprintk_cont("egress_purge_reply_rcvd\n"); 936 egress_purge_rcvd(mesg, mpc); 937 break; 938 case MPS_DEATH: 939 dprintk_cont("mps_death\n"); 940 mps_death(mesg, mpc); 941 break; 942 case CACHE_IMPOS_RCVD: 943 dprintk_cont("cache_impos_rcvd\n"); 944 MPOA_cache_impos_rcvd(mesg, mpc); 945 break; 946 case SET_MPC_CTRL_ADDR: 947 dprintk_cont("set_mpc_ctrl_addr\n"); 948 set_mpc_ctrl_addr_rcvd(mesg, mpc); 949 break; 950 case SET_MPS_MAC_ADDR: 951 dprintk_cont("set_mps_mac_addr\n"); 952 set_mps_mac_addr_rcvd(mesg, mpc); 953 break; 954 case CLEAN_UP_AND_EXIT: 955 dprintk_cont("clean_up_and_exit\n"); 956 clean_up(mesg, mpc, DIE); 957 break; 958 case RELOAD: 959 dprintk_cont("reload\n"); 960 clean_up(mesg, mpc, RELOAD); 961 break; 962 case SET_MPC_PARAMS: 963 dprintk_cont("set_mpc_params\n"); 964 mpc->parameters = mesg->content.params; 965 break; 966 default: 967 dprintk_cont("unknown message %d\n", mesg->type); 968 break; 969 } 970 kfree_skb(skb); 971 972 return 0; 973 } 974 975 /* Remember that this function may not do things that sleep */ 976 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc) 977 { 978 struct sk_buff *skb; 979 struct sock *sk; 980 981 if (mpc == NULL || !mpc->mpoad_vcc) { 982 pr_info("mesg %d to a non-existent mpoad\n", mesg->type); 983 return -ENXIO; 984 } 985 986 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC); 987 if (skb == NULL) 988 return -ENOMEM; 989 skb_put(skb, sizeof(struct k_message)); 990 skb_copy_to_linear_data(skb, mesg, sizeof(*mesg)); 991 atm_force_charge(mpc->mpoad_vcc, skb->truesize); 992 993 sk = sk_atm(mpc->mpoad_vcc); 994 skb_queue_tail(&sk->sk_receive_queue, skb); 995 sk->sk_data_ready(sk); 996 997 return 0; 998 } 999 1000 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, 1001 unsigned long event, void *ptr) 1002 { 1003 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1004 struct mpoa_client *mpc; 1005 struct lec_priv *priv; 1006 1007 if (!net_eq(dev_net(dev), &init_net)) 1008 return NOTIFY_DONE; 1009 1010 if (dev->name == NULL || strncmp(dev->name, "lec", 3)) 1011 return NOTIFY_DONE; /* we are only interested in lec:s */ 1012 1013 switch (event) { 1014 case NETDEV_REGISTER: /* a new lec device was allocated */ 1015 priv = netdev_priv(dev); 1016 if (priv->lane_version < 2) 1017 break; 1018 priv->lane2_ops->associate_indicator = lane2_assoc_ind; 1019 mpc = find_mpc_by_itfnum(priv->itfnum); 1020 if (mpc == NULL) { 1021 dprintk("allocating new mpc for %s\n", dev->name); 1022 mpc = alloc_mpc(); 1023 if (mpc == NULL) { 1024 pr_info("no new mpc"); 1025 break; 1026 } 1027 } 1028 mpc->dev_num = priv->itfnum; 1029 mpc->dev = dev; 1030 dev_hold(dev); 1031 dprintk("(%s) was initialized\n", dev->name); 1032 break; 1033 case NETDEV_UNREGISTER: 1034 /* the lec device was deallocated */ 1035 mpc = find_mpc_by_lec(dev); 1036 if (mpc == NULL) 1037 break; 1038 dprintk("device (%s) was deallocated\n", dev->name); 1039 stop_mpc(mpc); 1040 dev_put(mpc->dev); 1041 mpc->dev = NULL; 1042 break; 1043 case NETDEV_UP: 1044 /* the dev was ifconfig'ed up */ 1045 mpc = find_mpc_by_lec(dev); 1046 if (mpc == NULL) 1047 break; 1048 if (mpc->mpoad_vcc != NULL) 1049 start_mpc(mpc, dev); 1050 break; 1051 case NETDEV_DOWN: 1052 /* the dev was ifconfig'ed down */ 1053 /* this means that the flow of packets from the 1054 * upper layer stops 1055 */ 1056 mpc = find_mpc_by_lec(dev); 1057 if (mpc == NULL) 1058 break; 1059 if (mpc->mpoad_vcc != NULL) 1060 stop_mpc(mpc); 1061 break; 1062 case NETDEV_REBOOT: 1063 case NETDEV_CHANGE: 1064 case NETDEV_CHANGEMTU: 1065 case NETDEV_CHANGEADDR: 1066 case NETDEV_GOING_DOWN: 1067 break; 1068 default: 1069 break; 1070 } 1071 1072 return NOTIFY_DONE; 1073 } 1074 1075 /* 1076 * Functions which are called after a message is received from mpcd. 1077 * Msg is reused on purpose. 1078 */ 1079 1080 1081 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1082 { 1083 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1084 in_cache_entry *entry; 1085 1086 entry = mpc->in_ops->get(dst_ip, mpc); 1087 if (entry == NULL) { 1088 entry = mpc->in_ops->add_entry(dst_ip, mpc); 1089 entry->entry_state = INGRESS_RESOLVING; 1090 msg->type = SND_MPOA_RES_RQST; 1091 msg->content.in_info = entry->ctrl_info; 1092 msg_to_mpoad(msg, mpc); 1093 do_gettimeofday(&(entry->reply_wait)); 1094 mpc->in_ops->put(entry); 1095 return; 1096 } 1097 1098 if (entry->entry_state == INGRESS_INVALID) { 1099 entry->entry_state = INGRESS_RESOLVING; 1100 msg->type = SND_MPOA_RES_RQST; 1101 msg->content.in_info = entry->ctrl_info; 1102 msg_to_mpoad(msg, mpc); 1103 do_gettimeofday(&(entry->reply_wait)); 1104 mpc->in_ops->put(entry); 1105 return; 1106 } 1107 1108 pr_info("(%s) entry already in resolving state\n", 1109 (mpc->dev) ? mpc->dev->name : "<unknown>"); 1110 mpc->in_ops->put(entry); 1111 } 1112 1113 /* 1114 * Things get complicated because we have to check if there's an egress 1115 * shortcut with suitable traffic parameters we could use. 1116 */ 1117 static void check_qos_and_open_shortcut(struct k_message *msg, 1118 struct mpoa_client *client, 1119 in_cache_entry *entry) 1120 { 1121 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1122 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip); 1123 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client); 1124 1125 if (eg_entry && eg_entry->shortcut) { 1126 if (eg_entry->shortcut->qos.txtp.traffic_class & 1127 msg->qos.txtp.traffic_class & 1128 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)) { 1129 if (eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR) 1130 entry->shortcut = eg_entry->shortcut; 1131 else if (eg_entry->shortcut->qos.txtp.max_pcr > 0) 1132 entry->shortcut = eg_entry->shortcut; 1133 } 1134 if (entry->shortcut) { 1135 dprintk("(%s) using egress SVC to reach %pI4\n", 1136 client->dev->name, &dst_ip); 1137 client->eg_ops->put(eg_entry); 1138 return; 1139 } 1140 } 1141 if (eg_entry != NULL) 1142 client->eg_ops->put(eg_entry); 1143 1144 /* No luck in the egress cache we must open an ingress SVC */ 1145 msg->type = OPEN_INGRESS_SVC; 1146 if (qos && 1147 (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class)) { 1148 msg->qos = qos->qos; 1149 pr_info("(%s) trying to get a CBR shortcut\n", 1150 client->dev->name); 1151 } else 1152 memset(&msg->qos, 0, sizeof(struct atm_qos)); 1153 msg_to_mpoad(msg, client); 1154 } 1155 1156 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1157 { 1158 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1159 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc); 1160 1161 dprintk("(%s) ip %pI4\n", 1162 mpc->dev->name, &dst_ip); 1163 ddprintk("(%s) entry = %p", 1164 mpc->dev->name, entry); 1165 if (entry == NULL) { 1166 pr_info("(%s) ARGH, received res. reply for an entry that doesn't exist.\n", 1167 mpc->dev->name); 1168 return; 1169 } 1170 ddprintk_cont(" entry_state = %d ", entry->entry_state); 1171 1172 if (entry->entry_state == INGRESS_RESOLVED) { 1173 pr_info("(%s) RESOLVED entry!\n", mpc->dev->name); 1174 mpc->in_ops->put(entry); 1175 return; 1176 } 1177 1178 entry->ctrl_info = msg->content.in_info; 1179 do_gettimeofday(&(entry->tv)); 1180 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */ 1181 entry->refresh_time = 0; 1182 ddprintk_cont("entry->shortcut = %p\n", entry->shortcut); 1183 1184 if (entry->entry_state == INGRESS_RESOLVING && 1185 entry->shortcut != NULL) { 1186 entry->entry_state = INGRESS_RESOLVED; 1187 mpc->in_ops->put(entry); 1188 return; /* Shortcut already open... */ 1189 } 1190 1191 if (entry->shortcut != NULL) { 1192 pr_info("(%s) entry->shortcut != NULL, impossible!\n", 1193 mpc->dev->name); 1194 mpc->in_ops->put(entry); 1195 return; 1196 } 1197 1198 check_qos_and_open_shortcut(msg, mpc, entry); 1199 entry->entry_state = INGRESS_RESOLVED; 1200 mpc->in_ops->put(entry); 1201 1202 return; 1203 1204 } 1205 1206 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1207 { 1208 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1209 __be32 mask = msg->ip_mask; 1210 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask); 1211 1212 if (entry == NULL) { 1213 pr_info("(%s) purge for a non-existing entry, ip = %pI4\n", 1214 mpc->dev->name, &dst_ip); 1215 return; 1216 } 1217 1218 do { 1219 dprintk("(%s) removing an ingress entry, ip = %pI4\n", 1220 mpc->dev->name, &dst_ip); 1221 write_lock_bh(&mpc->ingress_lock); 1222 mpc->in_ops->remove_entry(entry, mpc); 1223 write_unlock_bh(&mpc->ingress_lock); 1224 mpc->in_ops->put(entry); 1225 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask); 1226 } while (entry != NULL); 1227 } 1228 1229 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1230 { 1231 __be32 cache_id = msg->content.eg_info.cache_id; 1232 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc); 1233 1234 if (entry == NULL) { 1235 dprintk("(%s) purge for a non-existing entry\n", 1236 mpc->dev->name); 1237 return; 1238 } 1239 1240 write_lock_irq(&mpc->egress_lock); 1241 mpc->eg_ops->remove_entry(entry, mpc); 1242 write_unlock_irq(&mpc->egress_lock); 1243 1244 mpc->eg_ops->put(entry); 1245 } 1246 1247 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry) 1248 { 1249 struct sock *sk; 1250 struct k_message *purge_msg; 1251 struct sk_buff *skb; 1252 1253 dprintk("entering\n"); 1254 if (vcc == NULL) { 1255 pr_info("vcc == NULL\n"); 1256 return; 1257 } 1258 1259 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC); 1260 if (skb == NULL) { 1261 pr_info("out of memory\n"); 1262 return; 1263 } 1264 1265 skb_put(skb, sizeof(struct k_message)); 1266 memset(skb->data, 0, sizeof(struct k_message)); 1267 purge_msg = (struct k_message *)skb->data; 1268 purge_msg->type = DATA_PLANE_PURGE; 1269 if (entry != NULL) 1270 purge_msg->content.eg_info = entry->ctrl_info; 1271 1272 atm_force_charge(vcc, skb->truesize); 1273 1274 sk = sk_atm(vcc); 1275 skb_queue_tail(&sk->sk_receive_queue, skb); 1276 sk->sk_data_ready(sk); 1277 dprintk("exiting\n"); 1278 } 1279 1280 /* 1281 * Our MPS died. Tell our daemon to send NHRP data plane purge to each 1282 * of the egress shortcuts we have. 1283 */ 1284 static void mps_death(struct k_message *msg, struct mpoa_client *mpc) 1285 { 1286 eg_cache_entry *entry; 1287 1288 dprintk("(%s)\n", mpc->dev->name); 1289 1290 if (memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)) { 1291 pr_info("(%s) wrong MPS\n", mpc->dev->name); 1292 return; 1293 } 1294 1295 /* FIXME: This knows too much of the cache structure */ 1296 read_lock_irq(&mpc->egress_lock); 1297 entry = mpc->eg_cache; 1298 while (entry != NULL) { 1299 purge_egress_shortcut(entry->shortcut, entry); 1300 entry = entry->next; 1301 } 1302 read_unlock_irq(&mpc->egress_lock); 1303 1304 mpc->in_ops->destroy_cache(mpc); 1305 mpc->eg_ops->destroy_cache(mpc); 1306 } 1307 1308 static void MPOA_cache_impos_rcvd(struct k_message *msg, 1309 struct mpoa_client *mpc) 1310 { 1311 uint16_t holding_time; 1312 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc); 1313 1314 holding_time = msg->content.eg_info.holding_time; 1315 dprintk("(%s) entry = %p, holding_time = %u\n", 1316 mpc->dev->name, entry, holding_time); 1317 if (entry == NULL && holding_time) { 1318 entry = mpc->eg_ops->add_entry(msg, mpc); 1319 mpc->eg_ops->put(entry); 1320 return; 1321 } 1322 if (holding_time) { 1323 mpc->eg_ops->update(entry, holding_time); 1324 return; 1325 } 1326 1327 write_lock_irq(&mpc->egress_lock); 1328 mpc->eg_ops->remove_entry(entry, mpc); 1329 write_unlock_irq(&mpc->egress_lock); 1330 1331 mpc->eg_ops->put(entry); 1332 } 1333 1334 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, 1335 struct mpoa_client *mpc) 1336 { 1337 struct lec_priv *priv; 1338 int i, retval ; 1339 1340 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN]; 1341 1342 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */ 1343 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */ 1344 tlv[5] = 0x02; /* MPOA client */ 1345 tlv[6] = 0x00; /* number of MPS MAC addresses */ 1346 1347 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */ 1348 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN); 1349 1350 dprintk("(%s) setting MPC ctrl ATM address to", 1351 mpc->dev ? mpc->dev->name : "<unknown>"); 1352 for (i = 7; i < sizeof(tlv); i++) 1353 dprintk_cont(" %02x", tlv[i]); 1354 dprintk_cont("\n"); 1355 1356 if (mpc->dev) { 1357 priv = netdev_priv(mpc->dev); 1358 retval = priv->lane2_ops->associate_req(mpc->dev, 1359 mpc->dev->dev_addr, 1360 tlv, sizeof(tlv)); 1361 if (retval == 0) 1362 pr_info("(%s) MPOA device type TLV association failed\n", 1363 mpc->dev->name); 1364 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL); 1365 if (retval < 0) 1366 pr_info("(%s) targetless LE_ARP request failed\n", 1367 mpc->dev->name); 1368 } 1369 } 1370 1371 static void set_mps_mac_addr_rcvd(struct k_message *msg, 1372 struct mpoa_client *client) 1373 { 1374 1375 if (client->number_of_mps_macs) 1376 kfree(client->mps_macs); 1377 client->number_of_mps_macs = 0; 1378 client->mps_macs = kmemdup(msg->MPS_ctrl, ETH_ALEN, GFP_KERNEL); 1379 if (client->mps_macs == NULL) { 1380 pr_info("out of memory\n"); 1381 return; 1382 } 1383 client->number_of_mps_macs = 1; 1384 } 1385 1386 /* 1387 * purge egress cache and tell daemon to 'action' (DIE, RELOAD) 1388 */ 1389 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action) 1390 { 1391 1392 eg_cache_entry *entry; 1393 msg->type = SND_EGRESS_PURGE; 1394 1395 1396 /* FIXME: This knows too much of the cache structure */ 1397 read_lock_irq(&mpc->egress_lock); 1398 entry = mpc->eg_cache; 1399 while (entry != NULL) { 1400 msg->content.eg_info = entry->ctrl_info; 1401 dprintk("cache_id %u\n", entry->ctrl_info.cache_id); 1402 msg_to_mpoad(msg, mpc); 1403 entry = entry->next; 1404 } 1405 read_unlock_irq(&mpc->egress_lock); 1406 1407 msg->type = action; 1408 msg_to_mpoad(msg, mpc); 1409 } 1410 1411 static void mpc_timer_refresh(void) 1412 { 1413 mpc_timer.expires = jiffies + (MPC_P2 * HZ); 1414 mpc_timer.data = mpc_timer.expires; 1415 mpc_timer.function = mpc_cache_check; 1416 add_timer(&mpc_timer); 1417 } 1418 1419 static void mpc_cache_check(unsigned long checking_time) 1420 { 1421 struct mpoa_client *mpc = mpcs; 1422 static unsigned long previous_resolving_check_time; 1423 static unsigned long previous_refresh_time; 1424 1425 while (mpc != NULL) { 1426 mpc->in_ops->clear_count(mpc); 1427 mpc->eg_ops->clear_expired(mpc); 1428 if (checking_time - previous_resolving_check_time > 1429 mpc->parameters.mpc_p4 * HZ) { 1430 mpc->in_ops->check_resolving(mpc); 1431 previous_resolving_check_time = checking_time; 1432 } 1433 if (checking_time - previous_refresh_time > 1434 mpc->parameters.mpc_p5 * HZ) { 1435 mpc->in_ops->refresh(mpc); 1436 previous_refresh_time = checking_time; 1437 } 1438 mpc = mpc->next; 1439 } 1440 mpc_timer_refresh(); 1441 } 1442 1443 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd, 1444 unsigned long arg) 1445 { 1446 int err = 0; 1447 struct atm_vcc *vcc = ATM_SD(sock); 1448 1449 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA) 1450 return -ENOIOCTLCMD; 1451 1452 if (!capable(CAP_NET_ADMIN)) 1453 return -EPERM; 1454 1455 switch (cmd) { 1456 case ATMMPC_CTRL: 1457 err = atm_mpoa_mpoad_attach(vcc, (int)arg); 1458 if (err >= 0) 1459 sock->state = SS_CONNECTED; 1460 break; 1461 case ATMMPC_DATA: 1462 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg); 1463 break; 1464 default: 1465 break; 1466 } 1467 return err; 1468 } 1469 1470 static struct atm_ioctl atm_ioctl_ops = { 1471 .owner = THIS_MODULE, 1472 .ioctl = atm_mpoa_ioctl, 1473 }; 1474 1475 static __init int atm_mpoa_init(void) 1476 { 1477 register_atm_ioctl(&atm_ioctl_ops); 1478 1479 if (mpc_proc_init() != 0) 1480 pr_info("failed to initialize /proc/mpoa\n"); 1481 1482 pr_info("mpc.c: initialized\n"); 1483 1484 return 0; 1485 } 1486 1487 static void __exit atm_mpoa_cleanup(void) 1488 { 1489 struct mpoa_client *mpc, *tmp; 1490 struct atm_mpoa_qos *qos, *nextqos; 1491 struct lec_priv *priv; 1492 1493 mpc_proc_clean(); 1494 1495 del_timer_sync(&mpc_timer); 1496 unregister_netdevice_notifier(&mpoa_notifier); 1497 deregister_atm_ioctl(&atm_ioctl_ops); 1498 1499 mpc = mpcs; 1500 mpcs = NULL; 1501 while (mpc != NULL) { 1502 tmp = mpc->next; 1503 if (mpc->dev != NULL) { 1504 stop_mpc(mpc); 1505 priv = netdev_priv(mpc->dev); 1506 if (priv->lane2_ops != NULL) 1507 priv->lane2_ops->associate_indicator = NULL; 1508 } 1509 ddprintk("about to clear caches\n"); 1510 mpc->in_ops->destroy_cache(mpc); 1511 mpc->eg_ops->destroy_cache(mpc); 1512 ddprintk("caches cleared\n"); 1513 kfree(mpc->mps_macs); 1514 memset(mpc, 0, sizeof(struct mpoa_client)); 1515 ddprintk("about to kfree %p\n", mpc); 1516 kfree(mpc); 1517 ddprintk("next mpc is at %p\n", tmp); 1518 mpc = tmp; 1519 } 1520 1521 qos = qos_head; 1522 qos_head = NULL; 1523 while (qos != NULL) { 1524 nextqos = qos->next; 1525 dprintk("freeing qos entry %p\n", qos); 1526 kfree(qos); 1527 qos = nextqos; 1528 } 1529 } 1530 1531 module_init(atm_mpoa_init); 1532 module_exit(atm_mpoa_cleanup); 1533 1534 MODULE_LICENSE("GPL"); 1535