1 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ 2 3 #include <linux/kernel.h> 4 #include <linux/string.h> 5 #include <linux/timer.h> 6 #include <linux/init.h> 7 #include <linux/bitops.h> 8 #include <linux/capability.h> 9 #include <linux/seq_file.h> 10 11 /* We are an ethernet device */ 12 #include <linux/if_ether.h> 13 #include <linux/netdevice.h> 14 #include <linux/etherdevice.h> 15 #include <net/sock.h> 16 #include <linux/skbuff.h> 17 #include <linux/ip.h> 18 #include <linux/uaccess.h> 19 #include <asm/byteorder.h> 20 #include <net/checksum.h> /* for ip_fast_csum() */ 21 #include <net/arp.h> 22 #include <net/dst.h> 23 #include <linux/proc_fs.h> 24 25 /* And atm device */ 26 #include <linux/atmdev.h> 27 #include <linux/atmlec.h> 28 #include <linux/atmmpc.h> 29 /* Modular too */ 30 #include <linux/module.h> 31 32 #include "lec.h" 33 #include "mpc.h" 34 #include "resources.h" 35 36 /* 37 * mpc.c: Implementation of MPOA client kernel part 38 */ 39 40 #if 0 41 #define dprintk(format, args...) \ 42 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args) 43 #define dprintk_cont(format, args...) printk(KERN_CONT format, ##args) 44 #else 45 #define dprintk(format, args...) \ 46 do { if (0) \ 47 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\ 48 } while (0) 49 #define dprintk_cont(format, args...) \ 50 do { if (0) printk(KERN_CONT format, ##args); } while (0) 51 #endif 52 53 #if 0 54 #define ddprintk(format, args...) \ 55 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args) 56 #define ddprintk_cont(format, args...) printk(KERN_CONT format, ##args) 57 #else 58 #define ddprintk(format, args...) \ 59 do { if (0) \ 60 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\ 61 } while (0) 62 #define ddprintk_cont(format, args...) \ 63 do { if (0) printk(KERN_CONT format, ##args); } while (0) 64 #endif 65 66 #define MPOA_TAG_LEN 4 67 68 /* mpc_daemon -> kernel */ 69 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc); 70 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc); 71 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc); 72 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc); 73 static void mps_death(struct k_message *msg, struct mpoa_client *mpc); 74 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, 75 int action); 76 static void MPOA_cache_impos_rcvd(struct k_message *msg, 77 struct mpoa_client *mpc); 78 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, 79 struct mpoa_client *mpc); 80 static void set_mps_mac_addr_rcvd(struct k_message *mesg, 81 struct mpoa_client *mpc); 82 83 static const uint8_t *copy_macs(struct mpoa_client *mpc, 84 const uint8_t *router_mac, 85 const uint8_t *tlvs, uint8_t mps_macs, 86 uint8_t device_type); 87 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry); 88 89 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc); 90 static void mpoad_close(struct atm_vcc *vcc); 91 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb); 92 93 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb); 94 static netdev_tx_t mpc_send_packet(struct sk_buff *skb, 95 struct net_device *dev); 96 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, 97 unsigned long event, void *dev); 98 static void mpc_timer_refresh(void); 99 static void mpc_cache_check(unsigned long checking_time); 100 101 static struct llc_snap_hdr llc_snap_mpoa_ctrl = { 102 0xaa, 0xaa, 0x03, 103 {0x00, 0x00, 0x5e}, 104 {0x00, 0x03} /* For MPOA control PDUs */ 105 }; 106 static struct llc_snap_hdr llc_snap_mpoa_data = { 107 0xaa, 0xaa, 0x03, 108 {0x00, 0x00, 0x00}, 109 {0x08, 0x00} /* This is for IP PDUs only */ 110 }; 111 static struct llc_snap_hdr llc_snap_mpoa_data_tagged = { 112 0xaa, 0xaa, 0x03, 113 {0x00, 0x00, 0x00}, 114 {0x88, 0x4c} /* This is for tagged data PDUs */ 115 }; 116 117 static struct notifier_block mpoa_notifier = { 118 mpoa_event_listener, 119 NULL, 120 0 121 }; 122 123 struct mpoa_client *mpcs = NULL; /* FIXME */ 124 static struct atm_mpoa_qos *qos_head = NULL; 125 static DEFINE_TIMER(mpc_timer, NULL, 0, 0); 126 127 128 static struct mpoa_client *find_mpc_by_itfnum(int itf) 129 { 130 struct mpoa_client *mpc; 131 132 mpc = mpcs; /* our global linked list */ 133 while (mpc != NULL) { 134 if (mpc->dev_num == itf) 135 return mpc; 136 mpc = mpc->next; 137 } 138 139 return NULL; /* not found */ 140 } 141 142 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc) 143 { 144 struct mpoa_client *mpc; 145 146 mpc = mpcs; /* our global linked list */ 147 while (mpc != NULL) { 148 if (mpc->mpoad_vcc == vcc) 149 return mpc; 150 mpc = mpc->next; 151 } 152 153 return NULL; /* not found */ 154 } 155 156 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev) 157 { 158 struct mpoa_client *mpc; 159 160 mpc = mpcs; /* our global linked list */ 161 while (mpc != NULL) { 162 if (mpc->dev == dev) 163 return mpc; 164 mpc = mpc->next; 165 } 166 167 return NULL; /* not found */ 168 } 169 170 /* 171 * Functions for managing QoS list 172 */ 173 174 /* 175 * Overwrites the old entry or makes a new one. 176 */ 177 struct atm_mpoa_qos *atm_mpoa_add_qos(__be32 dst_ip, struct atm_qos *qos) 178 { 179 struct atm_mpoa_qos *entry; 180 181 entry = atm_mpoa_search_qos(dst_ip); 182 if (entry != NULL) { 183 entry->qos = *qos; 184 return entry; 185 } 186 187 entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL); 188 if (entry == NULL) { 189 pr_info("mpoa: out of memory\n"); 190 return entry; 191 } 192 193 entry->ipaddr = dst_ip; 194 entry->qos = *qos; 195 196 entry->next = qos_head; 197 qos_head = entry; 198 199 return entry; 200 } 201 202 struct atm_mpoa_qos *atm_mpoa_search_qos(__be32 dst_ip) 203 { 204 struct atm_mpoa_qos *qos; 205 206 qos = qos_head; 207 while (qos) { 208 if (qos->ipaddr == dst_ip) 209 break; 210 qos = qos->next; 211 } 212 213 return qos; 214 } 215 216 /* 217 * Returns 0 for failure 218 */ 219 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry) 220 { 221 struct atm_mpoa_qos *curr; 222 223 if (entry == NULL) 224 return 0; 225 if (entry == qos_head) { 226 qos_head = qos_head->next; 227 kfree(entry); 228 return 1; 229 } 230 231 curr = qos_head; 232 while (curr != NULL) { 233 if (curr->next == entry) { 234 curr->next = entry->next; 235 kfree(entry); 236 return 1; 237 } 238 curr = curr->next; 239 } 240 241 return 0; 242 } 243 244 /* this is buggered - we need locking for qos_head */ 245 void atm_mpoa_disp_qos(struct seq_file *m) 246 { 247 struct atm_mpoa_qos *qos; 248 249 qos = qos_head; 250 seq_printf(m, "QoS entries for shortcuts:\n"); 251 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"); 252 253 while (qos != NULL) { 254 seq_printf(m, "%pI4\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n", 255 &qos->ipaddr, 256 qos->qos.txtp.max_pcr, 257 qos->qos.txtp.pcr, 258 qos->qos.txtp.min_pcr, 259 qos->qos.txtp.max_cdv, 260 qos->qos.txtp.max_sdu, 261 qos->qos.rxtp.max_pcr, 262 qos->qos.rxtp.pcr, 263 qos->qos.rxtp.min_pcr, 264 qos->qos.rxtp.max_cdv, 265 qos->qos.rxtp.max_sdu); 266 qos = qos->next; 267 } 268 } 269 270 static struct net_device *find_lec_by_itfnum(int itf) 271 { 272 struct net_device *dev; 273 char name[IFNAMSIZ]; 274 275 sprintf(name, "lec%d", itf); 276 dev = dev_get_by_name(&init_net, name); 277 278 return dev; 279 } 280 281 static struct mpoa_client *alloc_mpc(void) 282 { 283 struct mpoa_client *mpc; 284 285 mpc = kzalloc(sizeof(struct mpoa_client), GFP_KERNEL); 286 if (mpc == NULL) 287 return NULL; 288 rwlock_init(&mpc->ingress_lock); 289 rwlock_init(&mpc->egress_lock); 290 mpc->next = mpcs; 291 atm_mpoa_init_cache(mpc); 292 293 mpc->parameters.mpc_p1 = MPC_P1; 294 mpc->parameters.mpc_p2 = MPC_P2; 295 memset(mpc->parameters.mpc_p3, 0, sizeof(mpc->parameters.mpc_p3)); 296 mpc->parameters.mpc_p4 = MPC_P4; 297 mpc->parameters.mpc_p5 = MPC_P5; 298 mpc->parameters.mpc_p6 = MPC_P6; 299 300 mpcs = mpc; 301 302 return mpc; 303 } 304 305 /* 306 * 307 * start_mpc() puts the MPC on line. All the packets destined 308 * to the lec underneath us are now being monitored and 309 * shortcuts will be established. 310 * 311 */ 312 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev) 313 { 314 315 dprintk("(%s)\n", mpc->dev->name); 316 if (!dev->netdev_ops) 317 pr_info("(%s) not starting\n", dev->name); 318 else { 319 mpc->old_ops = dev->netdev_ops; 320 mpc->new_ops = *mpc->old_ops; 321 mpc->new_ops.ndo_start_xmit = mpc_send_packet; 322 dev->netdev_ops = &mpc->new_ops; 323 } 324 } 325 326 static void stop_mpc(struct mpoa_client *mpc) 327 { 328 struct net_device *dev = mpc->dev; 329 dprintk("(%s)", mpc->dev->name); 330 331 /* Lets not nullify lec device's dev->hard_start_xmit */ 332 if (dev->netdev_ops != &mpc->new_ops) { 333 dprintk_cont(" mpc already stopped, not fatal\n"); 334 return; 335 } 336 dprintk_cont("\n"); 337 338 dev->netdev_ops = mpc->old_ops; 339 mpc->old_ops = NULL; 340 341 /* close_shortcuts(mpc); ??? FIXME */ 342 } 343 344 static const char *mpoa_device_type_string(char type) __attribute__ ((unused)); 345 346 static const char *mpoa_device_type_string(char type) 347 { 348 switch (type) { 349 case NON_MPOA: 350 return "non-MPOA device"; 351 case MPS: 352 return "MPS"; 353 case MPC: 354 return "MPC"; 355 case MPS_AND_MPC: 356 return "both MPS and MPC"; 357 } 358 359 return "unspecified (non-MPOA) device"; 360 } 361 362 /* 363 * lec device calls this via its netdev_priv(dev)->lane2_ops 364 * ->associate_indicator() when it sees a TLV in LE_ARP packet. 365 * We fill in the pointer above when we see a LANE2 lec initializing 366 * See LANE2 spec 3.1.5 367 * 368 * Quite a big and ugly function but when you look at it 369 * all it does is to try to locate and parse MPOA Device 370 * Type TLV. 371 * We give our lec a pointer to this function and when the 372 * lec sees a TLV it uses the pointer to call this function. 373 * 374 */ 375 static void lane2_assoc_ind(struct net_device *dev, const u8 *mac_addr, 376 const u8 *tlvs, u32 sizeoftlvs) 377 { 378 uint32_t type; 379 uint8_t length, mpoa_device_type, number_of_mps_macs; 380 const uint8_t *end_of_tlvs; 381 struct mpoa_client *mpc; 382 383 mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */ 384 dprintk("(%s) received TLV(s), ", dev->name); 385 dprintk("total length of all TLVs %d\n", sizeoftlvs); 386 mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */ 387 if (mpc == NULL) { 388 pr_info("(%s) no mpc\n", dev->name); 389 return; 390 } 391 end_of_tlvs = tlvs + sizeoftlvs; 392 while (end_of_tlvs - tlvs >= 5) { 393 type = ((tlvs[0] << 24) | (tlvs[1] << 16) | 394 (tlvs[2] << 8) | tlvs[3]); 395 length = tlvs[4]; 396 tlvs += 5; 397 dprintk(" type 0x%x length %02x\n", type, length); 398 if (tlvs + length > end_of_tlvs) { 399 pr_info("TLV value extends past its buffer, aborting parse\n"); 400 return; 401 } 402 403 if (type == 0) { 404 pr_info("mpoa: (%s) TLV type was 0, returning\n", 405 dev->name); 406 return; 407 } 408 409 if (type != TLV_MPOA_DEVICE_TYPE) { 410 tlvs += length; 411 continue; /* skip other TLVs */ 412 } 413 mpoa_device_type = *tlvs++; 414 number_of_mps_macs = *tlvs++; 415 dprintk("(%s) MPOA device type '%s', ", 416 dev->name, mpoa_device_type_string(mpoa_device_type)); 417 if (mpoa_device_type == MPS_AND_MPC && 418 length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */ 419 pr_info("(%s) short MPOA Device Type TLV\n", 420 dev->name); 421 continue; 422 } 423 if ((mpoa_device_type == MPS || mpoa_device_type == MPC) && 424 length < 22 + number_of_mps_macs*ETH_ALEN) { 425 pr_info("(%s) short MPOA Device Type TLV\n", dev->name); 426 continue; 427 } 428 if (mpoa_device_type != MPS && 429 mpoa_device_type != MPS_AND_MPC) { 430 dprintk("ignoring non-MPS device "); 431 if (mpoa_device_type == MPC) 432 tlvs += 20; 433 continue; /* we are only interested in MPSs */ 434 } 435 if (number_of_mps_macs == 0 && 436 mpoa_device_type == MPS_AND_MPC) { 437 pr_info("(%s) MPS_AND_MPC has zero MACs\n", dev->name); 438 continue; /* someone should read the spec */ 439 } 440 dprintk_cont("this MPS has %d MAC addresses\n", 441 number_of_mps_macs); 442 443 /* 444 * ok, now we can go and tell our daemon 445 * the control address of MPS 446 */ 447 send_set_mps_ctrl_addr(tlvs, mpc); 448 449 tlvs = copy_macs(mpc, mac_addr, tlvs, 450 number_of_mps_macs, mpoa_device_type); 451 if (tlvs == NULL) 452 return; 453 } 454 if (end_of_tlvs - tlvs != 0) 455 pr_info("(%s) ignoring %Zd bytes of trailing TLV garbage\n", 456 dev->name, end_of_tlvs - tlvs); 457 return; 458 } 459 460 /* 461 * Store at least advertizing router's MAC address 462 * plus the possible MAC address(es) to mpc->mps_macs. 463 * For a freshly allocated MPOA client mpc->mps_macs == 0. 464 */ 465 static const uint8_t *copy_macs(struct mpoa_client *mpc, 466 const uint8_t *router_mac, 467 const uint8_t *tlvs, uint8_t mps_macs, 468 uint8_t device_type) 469 { 470 int num_macs; 471 num_macs = (mps_macs > 1) ? mps_macs : 1; 472 473 if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */ 474 if (mpc->number_of_mps_macs != 0) 475 kfree(mpc->mps_macs); 476 mpc->number_of_mps_macs = 0; 477 mpc->mps_macs = kmalloc(num_macs * ETH_ALEN, GFP_KERNEL); 478 if (mpc->mps_macs == NULL) { 479 pr_info("(%s) out of mem\n", mpc->dev->name); 480 return NULL; 481 } 482 } 483 memcpy(mpc->mps_macs, router_mac, ETH_ALEN); 484 tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20; 485 if (mps_macs > 0) 486 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN); 487 tlvs += mps_macs*ETH_ALEN; 488 mpc->number_of_mps_macs = num_macs; 489 490 return tlvs; 491 } 492 493 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc) 494 { 495 in_cache_entry *entry; 496 struct iphdr *iph; 497 char *buff; 498 __be32 ipaddr = 0; 499 500 static struct { 501 struct llc_snap_hdr hdr; 502 __be32 tag; 503 } tagged_llc_snap_hdr = { 504 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}}, 505 0 506 }; 507 508 buff = skb->data + mpc->dev->hard_header_len; 509 iph = (struct iphdr *)buff; 510 ipaddr = iph->daddr; 511 512 ddprintk("(%s) ipaddr 0x%x\n", 513 mpc->dev->name, ipaddr); 514 515 entry = mpc->in_ops->get(ipaddr, mpc); 516 if (entry == NULL) { 517 entry = mpc->in_ops->add_entry(ipaddr, mpc); 518 if (entry != NULL) 519 mpc->in_ops->put(entry); 520 return 1; 521 } 522 /* threshold not exceeded or VCC not ready */ 523 if (mpc->in_ops->cache_hit(entry, mpc) != OPEN) { 524 ddprintk("(%s) cache_hit: returns != OPEN\n", 525 mpc->dev->name); 526 mpc->in_ops->put(entry); 527 return 1; 528 } 529 530 ddprintk("(%s) using shortcut\n", 531 mpc->dev->name); 532 /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */ 533 if (iph->ttl <= 1) { 534 ddprintk("(%s) IP ttl = %u, using LANE\n", 535 mpc->dev->name, iph->ttl); 536 mpc->in_ops->put(entry); 537 return 1; 538 } 539 iph->ttl--; 540 iph->check = 0; 541 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 542 543 if (entry->ctrl_info.tag != 0) { 544 ddprintk("(%s) adding tag 0x%x\n", 545 mpc->dev->name, entry->ctrl_info.tag); 546 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag; 547 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */ 548 skb_push(skb, sizeof(tagged_llc_snap_hdr)); 549 /* add LLC/SNAP header */ 550 skb_copy_to_linear_data(skb, &tagged_llc_snap_hdr, 551 sizeof(tagged_llc_snap_hdr)); 552 } else { 553 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */ 554 skb_push(skb, sizeof(struct llc_snap_hdr)); 555 /* add LLC/SNAP header + tag */ 556 skb_copy_to_linear_data(skb, &llc_snap_mpoa_data, 557 sizeof(struct llc_snap_hdr)); 558 } 559 560 atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc); 561 ATM_SKB(skb)->atm_options = entry->shortcut->atm_options; 562 entry->shortcut->send(entry->shortcut, skb); 563 entry->packets_fwded++; 564 mpc->in_ops->put(entry); 565 566 return 0; 567 } 568 569 /* 570 * Probably needs some error checks and locking, not sure... 571 */ 572 static netdev_tx_t mpc_send_packet(struct sk_buff *skb, 573 struct net_device *dev) 574 { 575 struct mpoa_client *mpc; 576 struct ethhdr *eth; 577 int i = 0; 578 579 mpc = find_mpc_by_lec(dev); /* this should NEVER fail */ 580 if (mpc == NULL) { 581 pr_info("(%s) no MPC found\n", dev->name); 582 goto non_ip; 583 } 584 585 eth = (struct ethhdr *)skb->data; 586 if (eth->h_proto != htons(ETH_P_IP)) 587 goto non_ip; /* Multi-Protocol Over ATM :-) */ 588 589 /* Weed out funny packets (e.g., AF_PACKET or raw). */ 590 if (skb->len < ETH_HLEN + sizeof(struct iphdr)) 591 goto non_ip; 592 skb_set_network_header(skb, ETH_HLEN); 593 if (skb->len < ETH_HLEN + ip_hdr(skb)->ihl * 4 || ip_hdr(skb)->ihl < 5) 594 goto non_ip; 595 596 while (i < mpc->number_of_mps_macs) { 597 if (!compare_ether_addr(eth->h_dest, 598 (mpc->mps_macs + i*ETH_ALEN))) 599 if (send_via_shortcut(skb, mpc) == 0) /* try shortcut */ 600 return NETDEV_TX_OK; 601 i++; 602 } 603 604 non_ip: 605 return mpc->old_ops->ndo_start_xmit(skb, dev); 606 } 607 608 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg) 609 { 610 int bytes_left; 611 struct mpoa_client *mpc; 612 struct atmmpc_ioc ioc_data; 613 in_cache_entry *in_entry; 614 __be32 ipaddr; 615 616 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc)); 617 if (bytes_left != 0) { 618 pr_info("mpoa:Short read (missed %d bytes) from userland\n", 619 bytes_left); 620 return -EFAULT; 621 } 622 ipaddr = ioc_data.ipaddr; 623 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF) 624 return -EINVAL; 625 626 mpc = find_mpc_by_itfnum(ioc_data.dev_num); 627 if (mpc == NULL) 628 return -EINVAL; 629 630 if (ioc_data.type == MPC_SOCKET_INGRESS) { 631 in_entry = mpc->in_ops->get(ipaddr, mpc); 632 if (in_entry == NULL || 633 in_entry->entry_state < INGRESS_RESOLVED) { 634 pr_info("(%s) did not find RESOLVED entry from ingress cache\n", 635 mpc->dev->name); 636 if (in_entry != NULL) 637 mpc->in_ops->put(in_entry); 638 return -EINVAL; 639 } 640 pr_info("(%s) attaching ingress SVC, entry = %pI4\n", 641 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip); 642 in_entry->shortcut = vcc; 643 mpc->in_ops->put(in_entry); 644 } else { 645 pr_info("(%s) attaching egress SVC\n", mpc->dev->name); 646 } 647 648 vcc->proto_data = mpc->dev; 649 vcc->push = mpc_push; 650 651 return 0; 652 } 653 654 /* 655 * 656 */ 657 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev) 658 { 659 struct mpoa_client *mpc; 660 in_cache_entry *in_entry; 661 eg_cache_entry *eg_entry; 662 663 mpc = find_mpc_by_lec(dev); 664 if (mpc == NULL) { 665 pr_info("(%s) close for unknown MPC\n", dev->name); 666 return; 667 } 668 669 dprintk("(%s)\n", dev->name); 670 in_entry = mpc->in_ops->get_by_vcc(vcc, mpc); 671 if (in_entry) { 672 dprintk("(%s) ingress SVC closed ip = %pI4\n", 673 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip); 674 in_entry->shortcut = NULL; 675 mpc->in_ops->put(in_entry); 676 } 677 eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc); 678 if (eg_entry) { 679 dprintk("(%s) egress SVC closed\n", mpc->dev->name); 680 eg_entry->shortcut = NULL; 681 mpc->eg_ops->put(eg_entry); 682 } 683 684 if (in_entry == NULL && eg_entry == NULL) 685 dprintk("(%s) unused vcc closed\n", dev->name); 686 687 return; 688 } 689 690 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb) 691 { 692 struct net_device *dev = (struct net_device *)vcc->proto_data; 693 struct sk_buff *new_skb; 694 eg_cache_entry *eg; 695 struct mpoa_client *mpc; 696 __be32 tag; 697 char *tmp; 698 699 ddprintk("(%s)\n", dev->name); 700 if (skb == NULL) { 701 dprintk("(%s) null skb, closing VCC\n", dev->name); 702 mpc_vcc_close(vcc, dev); 703 return; 704 } 705 706 skb->dev = dev; 707 if (memcmp(skb->data, &llc_snap_mpoa_ctrl, 708 sizeof(struct llc_snap_hdr)) == 0) { 709 struct sock *sk = sk_atm(vcc); 710 711 dprintk("(%s) control packet arrived\n", dev->name); 712 /* Pass control packets to daemon */ 713 skb_queue_tail(&sk->sk_receive_queue, skb); 714 sk->sk_data_ready(sk, skb->len); 715 return; 716 } 717 718 /* data coming over the shortcut */ 719 atm_return(vcc, skb->truesize); 720 721 mpc = find_mpc_by_lec(dev); 722 if (mpc == NULL) { 723 pr_info("(%s) unknown MPC\n", dev->name); 724 return; 725 } 726 727 if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, 728 sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */ 729 ddprintk("(%s) tagged data packet arrived\n", dev->name); 730 731 } else if (memcmp(skb->data, &llc_snap_mpoa_data, 732 sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */ 733 pr_info("(%s) Unsupported non-tagged data packet arrived. Purging\n", 734 dev->name); 735 dev_kfree_skb_any(skb); 736 return; 737 } else { 738 pr_info("(%s) garbage arrived, purging\n", dev->name); 739 dev_kfree_skb_any(skb); 740 return; 741 } 742 743 tmp = skb->data + sizeof(struct llc_snap_hdr); 744 tag = *(__be32 *)tmp; 745 746 eg = mpc->eg_ops->get_by_tag(tag, mpc); 747 if (eg == NULL) { 748 pr_info("mpoa: (%s) Didn't find egress cache entry, tag = %u\n", 749 dev->name, tag); 750 purge_egress_shortcut(vcc, NULL); 751 dev_kfree_skb_any(skb); 752 return; 753 } 754 755 /* 756 * See if ingress MPC is using shortcut we opened as a return channel. 757 * This means we have a bi-directional vcc opened by us. 758 */ 759 if (eg->shortcut == NULL) { 760 eg->shortcut = vcc; 761 pr_info("(%s) egress SVC in use\n", dev->name); 762 } 763 764 skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); 765 /* get rid of LLC/SNAP header */ 766 new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); 767 /* LLC/SNAP is shorter than MAC header :( */ 768 dev_kfree_skb_any(skb); 769 if (new_skb == NULL) { 770 mpc->eg_ops->put(eg); 771 return; 772 } 773 skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */ 774 skb_copy_to_linear_data(new_skb, eg->ctrl_info.DLL_header, 775 eg->ctrl_info.DH_length); 776 new_skb->protocol = eth_type_trans(new_skb, dev); 777 skb_reset_network_header(new_skb); 778 779 eg->latest_ip_addr = ip_hdr(new_skb)->saddr; 780 eg->packets_rcvd++; 781 mpc->eg_ops->put(eg); 782 783 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 784 netif_rx(new_skb); 785 786 return; 787 } 788 789 static struct atmdev_ops mpc_ops = { /* only send is required */ 790 .close = mpoad_close, 791 .send = msg_from_mpoad 792 }; 793 794 static struct atm_dev mpc_dev = { 795 .ops = &mpc_ops, 796 .type = "mpc", 797 .number = 42, 798 .lock = __SPIN_LOCK_UNLOCKED(mpc_dev.lock) 799 /* members not explicitly initialised will be 0 */ 800 }; 801 802 static int atm_mpoa_mpoad_attach(struct atm_vcc *vcc, int arg) 803 { 804 struct mpoa_client *mpc; 805 struct lec_priv *priv; 806 int err; 807 808 if (mpcs == NULL) { 809 init_timer(&mpc_timer); 810 mpc_timer_refresh(); 811 812 /* This lets us now how our LECs are doing */ 813 err = register_netdevice_notifier(&mpoa_notifier); 814 if (err < 0) { 815 del_timer(&mpc_timer); 816 return err; 817 } 818 } 819 820 mpc = find_mpc_by_itfnum(arg); 821 if (mpc == NULL) { 822 dprintk("allocating new mpc for itf %d\n", arg); 823 mpc = alloc_mpc(); 824 if (mpc == NULL) 825 return -ENOMEM; 826 mpc->dev_num = arg; 827 mpc->dev = find_lec_by_itfnum(arg); 828 /* NULL if there was no lec */ 829 } 830 if (mpc->mpoad_vcc) { 831 pr_info("mpoad is already present for itf %d\n", arg); 832 return -EADDRINUSE; 833 } 834 835 if (mpc->dev) { /* check if the lec is LANE2 capable */ 836 priv = netdev_priv(mpc->dev); 837 if (priv->lane_version < 2) { 838 dev_put(mpc->dev); 839 mpc->dev = NULL; 840 } else 841 priv->lane2_ops->associate_indicator = lane2_assoc_ind; 842 } 843 844 mpc->mpoad_vcc = vcc; 845 vcc->dev = &mpc_dev; 846 vcc_insert_socket(sk_atm(vcc)); 847 set_bit(ATM_VF_META, &vcc->flags); 848 set_bit(ATM_VF_READY, &vcc->flags); 849 850 if (mpc->dev) { 851 char empty[ATM_ESA_LEN]; 852 memset(empty, 0, ATM_ESA_LEN); 853 854 start_mpc(mpc, mpc->dev); 855 /* set address if mpcd e.g. gets killed and restarted. 856 * If we do not do it now we have to wait for the next LE_ARP 857 */ 858 if (memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0) 859 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc); 860 } 861 862 __module_get(THIS_MODULE); 863 return arg; 864 } 865 866 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc) 867 { 868 struct k_message mesg; 869 870 memcpy(mpc->mps_ctrl_addr, addr, ATM_ESA_LEN); 871 872 mesg.type = SET_MPS_CTRL_ADDR; 873 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN); 874 msg_to_mpoad(&mesg, mpc); 875 876 return; 877 } 878 879 static void mpoad_close(struct atm_vcc *vcc) 880 { 881 struct mpoa_client *mpc; 882 struct sk_buff *skb; 883 884 mpc = find_mpc_by_vcc(vcc); 885 if (mpc == NULL) { 886 pr_info("did not find MPC\n"); 887 return; 888 } 889 if (!mpc->mpoad_vcc) { 890 pr_info("close for non-present mpoad\n"); 891 return; 892 } 893 894 mpc->mpoad_vcc = NULL; 895 if (mpc->dev) { 896 struct lec_priv *priv = netdev_priv(mpc->dev); 897 priv->lane2_ops->associate_indicator = NULL; 898 stop_mpc(mpc); 899 dev_put(mpc->dev); 900 } 901 902 mpc->in_ops->destroy_cache(mpc); 903 mpc->eg_ops->destroy_cache(mpc); 904 905 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) { 906 atm_return(vcc, skb->truesize); 907 kfree_skb(skb); 908 } 909 910 pr_info("(%s) going down\n", 911 (mpc->dev) ? mpc->dev->name : "<unknown>"); 912 module_put(THIS_MODULE); 913 914 return; 915 } 916 917 /* 918 * 919 */ 920 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb) 921 { 922 923 struct mpoa_client *mpc = find_mpc_by_vcc(vcc); 924 struct k_message *mesg = (struct k_message *)skb->data; 925 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); 926 927 if (mpc == NULL) { 928 pr_info("no mpc found\n"); 929 return 0; 930 } 931 dprintk("(%s)", mpc->dev ? mpc->dev->name : "<unknown>"); 932 switch (mesg->type) { 933 case MPOA_RES_REPLY_RCVD: 934 dprintk_cont("mpoa_res_reply_rcvd\n"); 935 MPOA_res_reply_rcvd(mesg, mpc); 936 break; 937 case MPOA_TRIGGER_RCVD: 938 dprintk_cont("mpoa_trigger_rcvd\n"); 939 MPOA_trigger_rcvd(mesg, mpc); 940 break; 941 case INGRESS_PURGE_RCVD: 942 dprintk_cont("nhrp_purge_rcvd\n"); 943 ingress_purge_rcvd(mesg, mpc); 944 break; 945 case EGRESS_PURGE_RCVD: 946 dprintk_cont("egress_purge_reply_rcvd\n"); 947 egress_purge_rcvd(mesg, mpc); 948 break; 949 case MPS_DEATH: 950 dprintk_cont("mps_death\n"); 951 mps_death(mesg, mpc); 952 break; 953 case CACHE_IMPOS_RCVD: 954 dprintk_cont("cache_impos_rcvd\n"); 955 MPOA_cache_impos_rcvd(mesg, mpc); 956 break; 957 case SET_MPC_CTRL_ADDR: 958 dprintk_cont("set_mpc_ctrl_addr\n"); 959 set_mpc_ctrl_addr_rcvd(mesg, mpc); 960 break; 961 case SET_MPS_MAC_ADDR: 962 dprintk_cont("set_mps_mac_addr\n"); 963 set_mps_mac_addr_rcvd(mesg, mpc); 964 break; 965 case CLEAN_UP_AND_EXIT: 966 dprintk_cont("clean_up_and_exit\n"); 967 clean_up(mesg, mpc, DIE); 968 break; 969 case RELOAD: 970 dprintk_cont("reload\n"); 971 clean_up(mesg, mpc, RELOAD); 972 break; 973 case SET_MPC_PARAMS: 974 dprintk_cont("set_mpc_params\n"); 975 mpc->parameters = mesg->content.params; 976 break; 977 default: 978 dprintk_cont("unknown message %d\n", mesg->type); 979 break; 980 } 981 kfree_skb(skb); 982 983 return 0; 984 } 985 986 /* Remember that this function may not do things that sleep */ 987 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc) 988 { 989 struct sk_buff *skb; 990 struct sock *sk; 991 992 if (mpc == NULL || !mpc->mpoad_vcc) { 993 pr_info("mesg %d to a non-existent mpoad\n", mesg->type); 994 return -ENXIO; 995 } 996 997 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC); 998 if (skb == NULL) 999 return -ENOMEM; 1000 skb_put(skb, sizeof(struct k_message)); 1001 skb_copy_to_linear_data(skb, mesg, sizeof(*mesg)); 1002 atm_force_charge(mpc->mpoad_vcc, skb->truesize); 1003 1004 sk = sk_atm(mpc->mpoad_vcc); 1005 skb_queue_tail(&sk->sk_receive_queue, skb); 1006 sk->sk_data_ready(sk, skb->len); 1007 1008 return 0; 1009 } 1010 1011 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, 1012 unsigned long event, void *dev_ptr) 1013 { 1014 struct net_device *dev; 1015 struct mpoa_client *mpc; 1016 struct lec_priv *priv; 1017 1018 dev = (struct net_device *)dev_ptr; 1019 1020 if (!net_eq(dev_net(dev), &init_net)) 1021 return NOTIFY_DONE; 1022 1023 if (dev->name == NULL || strncmp(dev->name, "lec", 3)) 1024 return NOTIFY_DONE; /* we are only interested in lec:s */ 1025 1026 switch (event) { 1027 case NETDEV_REGISTER: /* a new lec device was allocated */ 1028 priv = netdev_priv(dev); 1029 if (priv->lane_version < 2) 1030 break; 1031 priv->lane2_ops->associate_indicator = lane2_assoc_ind; 1032 mpc = find_mpc_by_itfnum(priv->itfnum); 1033 if (mpc == NULL) { 1034 dprintk("allocating new mpc for %s\n", dev->name); 1035 mpc = alloc_mpc(); 1036 if (mpc == NULL) { 1037 pr_info("no new mpc"); 1038 break; 1039 } 1040 } 1041 mpc->dev_num = priv->itfnum; 1042 mpc->dev = dev; 1043 dev_hold(dev); 1044 dprintk("(%s) was initialized\n", dev->name); 1045 break; 1046 case NETDEV_UNREGISTER: 1047 /* the lec device was deallocated */ 1048 mpc = find_mpc_by_lec(dev); 1049 if (mpc == NULL) 1050 break; 1051 dprintk("device (%s) was deallocated\n", dev->name); 1052 stop_mpc(mpc); 1053 dev_put(mpc->dev); 1054 mpc->dev = NULL; 1055 break; 1056 case NETDEV_UP: 1057 /* the dev was ifconfig'ed up */ 1058 mpc = find_mpc_by_lec(dev); 1059 if (mpc == NULL) 1060 break; 1061 if (mpc->mpoad_vcc != NULL) 1062 start_mpc(mpc, dev); 1063 break; 1064 case NETDEV_DOWN: 1065 /* the dev was ifconfig'ed down */ 1066 /* this means that the flow of packets from the 1067 * upper layer stops 1068 */ 1069 mpc = find_mpc_by_lec(dev); 1070 if (mpc == NULL) 1071 break; 1072 if (mpc->mpoad_vcc != NULL) 1073 stop_mpc(mpc); 1074 break; 1075 case NETDEV_REBOOT: 1076 case NETDEV_CHANGE: 1077 case NETDEV_CHANGEMTU: 1078 case NETDEV_CHANGEADDR: 1079 case NETDEV_GOING_DOWN: 1080 break; 1081 default: 1082 break; 1083 } 1084 1085 return NOTIFY_DONE; 1086 } 1087 1088 /* 1089 * Functions which are called after a message is received from mpcd. 1090 * Msg is reused on purpose. 1091 */ 1092 1093 1094 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1095 { 1096 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1097 in_cache_entry *entry; 1098 1099 entry = mpc->in_ops->get(dst_ip, mpc); 1100 if (entry == NULL) { 1101 entry = mpc->in_ops->add_entry(dst_ip, mpc); 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 if (entry->entry_state == INGRESS_INVALID) { 1112 entry->entry_state = INGRESS_RESOLVING; 1113 msg->type = SND_MPOA_RES_RQST; 1114 msg->content.in_info = entry->ctrl_info; 1115 msg_to_mpoad(msg, mpc); 1116 do_gettimeofday(&(entry->reply_wait)); 1117 mpc->in_ops->put(entry); 1118 return; 1119 } 1120 1121 pr_info("(%s) entry already in resolving state\n", 1122 (mpc->dev) ? mpc->dev->name : "<unknown>"); 1123 mpc->in_ops->put(entry); 1124 return; 1125 } 1126 1127 /* 1128 * Things get complicated because we have to check if there's an egress 1129 * shortcut with suitable traffic parameters we could use. 1130 */ 1131 static void check_qos_and_open_shortcut(struct k_message *msg, 1132 struct mpoa_client *client, 1133 in_cache_entry *entry) 1134 { 1135 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1136 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip); 1137 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client); 1138 1139 if (eg_entry && eg_entry->shortcut) { 1140 if (eg_entry->shortcut->qos.txtp.traffic_class & 1141 msg->qos.txtp.traffic_class & 1142 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)) { 1143 if (eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR) 1144 entry->shortcut = eg_entry->shortcut; 1145 else if (eg_entry->shortcut->qos.txtp.max_pcr > 0) 1146 entry->shortcut = eg_entry->shortcut; 1147 } 1148 if (entry->shortcut) { 1149 dprintk("(%s) using egress SVC to reach %pI4\n", 1150 client->dev->name, &dst_ip); 1151 client->eg_ops->put(eg_entry); 1152 return; 1153 } 1154 } 1155 if (eg_entry != NULL) 1156 client->eg_ops->put(eg_entry); 1157 1158 /* No luck in the egress cache we must open an ingress SVC */ 1159 msg->type = OPEN_INGRESS_SVC; 1160 if (qos && 1161 (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class)) { 1162 msg->qos = qos->qos; 1163 pr_info("(%s) trying to get a CBR shortcut\n", 1164 client->dev->name); 1165 } else 1166 memset(&msg->qos, 0, sizeof(struct atm_qos)); 1167 msg_to_mpoad(msg, client); 1168 return; 1169 } 1170 1171 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1172 { 1173 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1174 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc); 1175 1176 dprintk("(%s) ip %pI4\n", 1177 mpc->dev->name, &dst_ip); 1178 ddprintk("(%s) entry = %p", 1179 mpc->dev->name, entry); 1180 if (entry == NULL) { 1181 pr_info("(%s) ARGH, received res. reply for an entry that doesn't exist.\n", 1182 mpc->dev->name); 1183 return; 1184 } 1185 ddprintk_cont(" entry_state = %d ", entry->entry_state); 1186 1187 if (entry->entry_state == INGRESS_RESOLVED) { 1188 pr_info("(%s) RESOLVED entry!\n", mpc->dev->name); 1189 mpc->in_ops->put(entry); 1190 return; 1191 } 1192 1193 entry->ctrl_info = msg->content.in_info; 1194 do_gettimeofday(&(entry->tv)); 1195 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */ 1196 entry->refresh_time = 0; 1197 ddprintk_cont("entry->shortcut = %p\n", entry->shortcut); 1198 1199 if (entry->entry_state == INGRESS_RESOLVING && 1200 entry->shortcut != NULL) { 1201 entry->entry_state = INGRESS_RESOLVED; 1202 mpc->in_ops->put(entry); 1203 return; /* Shortcut already open... */ 1204 } 1205 1206 if (entry->shortcut != NULL) { 1207 pr_info("(%s) entry->shortcut != NULL, impossible!\n", 1208 mpc->dev->name); 1209 mpc->in_ops->put(entry); 1210 return; 1211 } 1212 1213 check_qos_and_open_shortcut(msg, mpc, entry); 1214 entry->entry_state = INGRESS_RESOLVED; 1215 mpc->in_ops->put(entry); 1216 1217 return; 1218 1219 } 1220 1221 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1222 { 1223 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1224 __be32 mask = msg->ip_mask; 1225 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask); 1226 1227 if (entry == NULL) { 1228 pr_info("(%s) purge for a non-existing entry, ip = %pI4\n", 1229 mpc->dev->name, &dst_ip); 1230 return; 1231 } 1232 1233 do { 1234 dprintk("(%s) removing an ingress entry, ip = %pI4\n", 1235 mpc->dev->name, &dst_ip); 1236 write_lock_bh(&mpc->ingress_lock); 1237 mpc->in_ops->remove_entry(entry, mpc); 1238 write_unlock_bh(&mpc->ingress_lock); 1239 mpc->in_ops->put(entry); 1240 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask); 1241 } while (entry != NULL); 1242 1243 return; 1244 } 1245 1246 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1247 { 1248 __be32 cache_id = msg->content.eg_info.cache_id; 1249 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc); 1250 1251 if (entry == NULL) { 1252 dprintk("(%s) purge for a non-existing entry\n", 1253 mpc->dev->name); 1254 return; 1255 } 1256 1257 write_lock_irq(&mpc->egress_lock); 1258 mpc->eg_ops->remove_entry(entry, mpc); 1259 write_unlock_irq(&mpc->egress_lock); 1260 1261 mpc->eg_ops->put(entry); 1262 1263 return; 1264 } 1265 1266 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry) 1267 { 1268 struct sock *sk; 1269 struct k_message *purge_msg; 1270 struct sk_buff *skb; 1271 1272 dprintk("entering\n"); 1273 if (vcc == NULL) { 1274 pr_info("vcc == NULL\n"); 1275 return; 1276 } 1277 1278 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC); 1279 if (skb == NULL) { 1280 pr_info("out of memory\n"); 1281 return; 1282 } 1283 1284 skb_put(skb, sizeof(struct k_message)); 1285 memset(skb->data, 0, sizeof(struct k_message)); 1286 purge_msg = (struct k_message *)skb->data; 1287 purge_msg->type = DATA_PLANE_PURGE; 1288 if (entry != NULL) 1289 purge_msg->content.eg_info = entry->ctrl_info; 1290 1291 atm_force_charge(vcc, skb->truesize); 1292 1293 sk = sk_atm(vcc); 1294 skb_queue_tail(&sk->sk_receive_queue, skb); 1295 sk->sk_data_ready(sk, skb->len); 1296 dprintk("exiting\n"); 1297 1298 return; 1299 } 1300 1301 /* 1302 * Our MPS died. Tell our daemon to send NHRP data plane purge to each 1303 * of the egress shortcuts we have. 1304 */ 1305 static void mps_death(struct k_message *msg, struct mpoa_client *mpc) 1306 { 1307 eg_cache_entry *entry; 1308 1309 dprintk("(%s)\n", mpc->dev->name); 1310 1311 if (memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)) { 1312 pr_info("(%s) wrong MPS\n", mpc->dev->name); 1313 return; 1314 } 1315 1316 /* FIXME: This knows too much of the cache structure */ 1317 read_lock_irq(&mpc->egress_lock); 1318 entry = mpc->eg_cache; 1319 while (entry != NULL) { 1320 purge_egress_shortcut(entry->shortcut, entry); 1321 entry = entry->next; 1322 } 1323 read_unlock_irq(&mpc->egress_lock); 1324 1325 mpc->in_ops->destroy_cache(mpc); 1326 mpc->eg_ops->destroy_cache(mpc); 1327 1328 return; 1329 } 1330 1331 static void MPOA_cache_impos_rcvd(struct k_message *msg, 1332 struct mpoa_client *mpc) 1333 { 1334 uint16_t holding_time; 1335 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc); 1336 1337 holding_time = msg->content.eg_info.holding_time; 1338 dprintk("(%s) entry = %p, holding_time = %u\n", 1339 mpc->dev->name, entry, holding_time); 1340 if (entry == NULL && holding_time) { 1341 entry = mpc->eg_ops->add_entry(msg, mpc); 1342 mpc->eg_ops->put(entry); 1343 return; 1344 } 1345 if (holding_time) { 1346 mpc->eg_ops->update(entry, holding_time); 1347 return; 1348 } 1349 1350 write_lock_irq(&mpc->egress_lock); 1351 mpc->eg_ops->remove_entry(entry, mpc); 1352 write_unlock_irq(&mpc->egress_lock); 1353 1354 mpc->eg_ops->put(entry); 1355 1356 return; 1357 } 1358 1359 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, 1360 struct mpoa_client *mpc) 1361 { 1362 struct lec_priv *priv; 1363 int i, retval ; 1364 1365 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN]; 1366 1367 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */ 1368 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */ 1369 tlv[5] = 0x02; /* MPOA client */ 1370 tlv[6] = 0x00; /* number of MPS MAC addresses */ 1371 1372 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */ 1373 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN); 1374 1375 dprintk("(%s) setting MPC ctrl ATM address to", 1376 mpc->dev ? mpc->dev->name : "<unknown>"); 1377 for (i = 7; i < sizeof(tlv); i++) 1378 dprintk_cont(" %02x", tlv[i]); 1379 dprintk_cont("\n"); 1380 1381 if (mpc->dev) { 1382 priv = netdev_priv(mpc->dev); 1383 retval = priv->lane2_ops->associate_req(mpc->dev, 1384 mpc->dev->dev_addr, 1385 tlv, sizeof(tlv)); 1386 if (retval == 0) 1387 pr_info("(%s) MPOA device type TLV association failed\n", 1388 mpc->dev->name); 1389 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL); 1390 if (retval < 0) 1391 pr_info("(%s) targetless LE_ARP request failed\n", 1392 mpc->dev->name); 1393 } 1394 1395 return; 1396 } 1397 1398 static void set_mps_mac_addr_rcvd(struct k_message *msg, 1399 struct mpoa_client *client) 1400 { 1401 1402 if (client->number_of_mps_macs) 1403 kfree(client->mps_macs); 1404 client->number_of_mps_macs = 0; 1405 client->mps_macs = kmemdup(msg->MPS_ctrl, ETH_ALEN, GFP_KERNEL); 1406 if (client->mps_macs == NULL) { 1407 pr_info("out of memory\n"); 1408 return; 1409 } 1410 client->number_of_mps_macs = 1; 1411 1412 return; 1413 } 1414 1415 /* 1416 * purge egress cache and tell daemon to 'action' (DIE, RELOAD) 1417 */ 1418 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action) 1419 { 1420 1421 eg_cache_entry *entry; 1422 msg->type = SND_EGRESS_PURGE; 1423 1424 1425 /* FIXME: This knows too much of the cache structure */ 1426 read_lock_irq(&mpc->egress_lock); 1427 entry = mpc->eg_cache; 1428 while (entry != NULL) { 1429 msg->content.eg_info = entry->ctrl_info; 1430 dprintk("cache_id %u\n", entry->ctrl_info.cache_id); 1431 msg_to_mpoad(msg, mpc); 1432 entry = entry->next; 1433 } 1434 read_unlock_irq(&mpc->egress_lock); 1435 1436 msg->type = action; 1437 msg_to_mpoad(msg, mpc); 1438 return; 1439 } 1440 1441 static void mpc_timer_refresh(void) 1442 { 1443 mpc_timer.expires = jiffies + (MPC_P2 * HZ); 1444 mpc_timer.data = mpc_timer.expires; 1445 mpc_timer.function = mpc_cache_check; 1446 add_timer(&mpc_timer); 1447 1448 return; 1449 } 1450 1451 static void mpc_cache_check(unsigned long checking_time) 1452 { 1453 struct mpoa_client *mpc = mpcs; 1454 static unsigned long previous_resolving_check_time; 1455 static unsigned long previous_refresh_time; 1456 1457 while (mpc != NULL) { 1458 mpc->in_ops->clear_count(mpc); 1459 mpc->eg_ops->clear_expired(mpc); 1460 if (checking_time - previous_resolving_check_time > 1461 mpc->parameters.mpc_p4 * HZ) { 1462 mpc->in_ops->check_resolving(mpc); 1463 previous_resolving_check_time = checking_time; 1464 } 1465 if (checking_time - previous_refresh_time > 1466 mpc->parameters.mpc_p5 * HZ) { 1467 mpc->in_ops->refresh(mpc); 1468 previous_refresh_time = checking_time; 1469 } 1470 mpc = mpc->next; 1471 } 1472 mpc_timer_refresh(); 1473 1474 return; 1475 } 1476 1477 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd, 1478 unsigned long arg) 1479 { 1480 int err = 0; 1481 struct atm_vcc *vcc = ATM_SD(sock); 1482 1483 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA) 1484 return -ENOIOCTLCMD; 1485 1486 if (!capable(CAP_NET_ADMIN)) 1487 return -EPERM; 1488 1489 switch (cmd) { 1490 case ATMMPC_CTRL: 1491 err = atm_mpoa_mpoad_attach(vcc, (int)arg); 1492 if (err >= 0) 1493 sock->state = SS_CONNECTED; 1494 break; 1495 case ATMMPC_DATA: 1496 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg); 1497 break; 1498 default: 1499 break; 1500 } 1501 return err; 1502 } 1503 1504 static struct atm_ioctl atm_ioctl_ops = { 1505 .owner = THIS_MODULE, 1506 .ioctl = atm_mpoa_ioctl, 1507 }; 1508 1509 static __init int atm_mpoa_init(void) 1510 { 1511 register_atm_ioctl(&atm_ioctl_ops); 1512 1513 if (mpc_proc_init() != 0) 1514 pr_info("failed to initialize /proc/mpoa\n"); 1515 1516 pr_info("mpc.c: " __DATE__ " " __TIME__ " initialized\n"); 1517 1518 return 0; 1519 } 1520 1521 static void __exit atm_mpoa_cleanup(void) 1522 { 1523 struct mpoa_client *mpc, *tmp; 1524 struct atm_mpoa_qos *qos, *nextqos; 1525 struct lec_priv *priv; 1526 1527 mpc_proc_clean(); 1528 1529 del_timer(&mpc_timer); 1530 unregister_netdevice_notifier(&mpoa_notifier); 1531 deregister_atm_ioctl(&atm_ioctl_ops); 1532 1533 mpc = mpcs; 1534 mpcs = NULL; 1535 while (mpc != NULL) { 1536 tmp = mpc->next; 1537 if (mpc->dev != NULL) { 1538 stop_mpc(mpc); 1539 priv = netdev_priv(mpc->dev); 1540 if (priv->lane2_ops != NULL) 1541 priv->lane2_ops->associate_indicator = NULL; 1542 } 1543 ddprintk("about to clear caches\n"); 1544 mpc->in_ops->destroy_cache(mpc); 1545 mpc->eg_ops->destroy_cache(mpc); 1546 ddprintk("caches cleared\n"); 1547 kfree(mpc->mps_macs); 1548 memset(mpc, 0, sizeof(struct mpoa_client)); 1549 ddprintk("about to kfree %p\n", mpc); 1550 kfree(mpc); 1551 ddprintk("next mpc is at %p\n", tmp); 1552 mpc = tmp; 1553 } 1554 1555 qos = qos_head; 1556 qos_head = NULL; 1557 while (qos != NULL) { 1558 nextqos = qos->next; 1559 dprintk("freeing qos entry %p\n", qos); 1560 kfree(qos); 1561 qos = nextqos; 1562 } 1563 1564 return; 1565 } 1566 1567 module_init(atm_mpoa_init); 1568 module_exit(atm_mpoa_cleanup); 1569 1570 MODULE_LICENSE("GPL"); 1571