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 #define MPOA_TAG_LEN 4 68 69 /* mpc_daemon -> kernel */ 70 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc); 71 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc); 72 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc); 73 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc); 74 static void mps_death(struct k_message *msg, struct mpoa_client *mpc); 75 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, 76 int action); 77 static void MPOA_cache_impos_rcvd(struct k_message *msg, 78 struct mpoa_client *mpc); 79 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, 80 struct mpoa_client *mpc); 81 static void set_mps_mac_addr_rcvd(struct k_message *mesg, 82 struct mpoa_client *mpc); 83 84 static const uint8_t *copy_macs(struct mpoa_client *mpc, 85 const uint8_t *router_mac, 86 const uint8_t *tlvs, uint8_t mps_macs, 87 uint8_t device_type); 88 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry); 89 90 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc); 91 static void mpoad_close(struct atm_vcc *vcc); 92 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb); 93 94 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb); 95 static netdev_tx_t mpc_send_packet(struct sk_buff *skb, 96 struct net_device *dev); 97 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, 98 unsigned long event, void *dev); 99 static void mpc_timer_refresh(void); 100 static void mpc_cache_check(unsigned long checking_time); 101 102 static struct llc_snap_hdr llc_snap_mpoa_ctrl = { 103 0xaa, 0xaa, 0x03, 104 {0x00, 0x00, 0x5e}, 105 {0x00, 0x03} /* For MPOA control PDUs */ 106 }; 107 static struct llc_snap_hdr llc_snap_mpoa_data = { 108 0xaa, 0xaa, 0x03, 109 {0x00, 0x00, 0x00}, 110 {0x08, 0x00} /* This is for IP PDUs only */ 111 }; 112 static struct llc_snap_hdr llc_snap_mpoa_data_tagged = { 113 0xaa, 0xaa, 0x03, 114 {0x00, 0x00, 0x00}, 115 {0x88, 0x4c} /* This is for tagged data PDUs */ 116 }; 117 118 static struct notifier_block mpoa_notifier = { 119 mpoa_event_listener, 120 NULL, 121 0 122 }; 123 124 struct mpoa_client *mpcs = NULL; /* FIXME */ 125 static struct atm_mpoa_qos *qos_head = NULL; 126 static DEFINE_TIMER(mpc_timer, NULL, 0, 0); 127 128 129 static struct mpoa_client *find_mpc_by_itfnum(int itf) 130 { 131 struct mpoa_client *mpc; 132 133 mpc = mpcs; /* our global linked list */ 134 while (mpc != NULL) { 135 if (mpc->dev_num == itf) 136 return mpc; 137 mpc = mpc->next; 138 } 139 140 return NULL; /* not found */ 141 } 142 143 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc) 144 { 145 struct mpoa_client *mpc; 146 147 mpc = mpcs; /* our global linked list */ 148 while (mpc != NULL) { 149 if (mpc->mpoad_vcc == vcc) 150 return mpc; 151 mpc = mpc->next; 152 } 153 154 return NULL; /* not found */ 155 } 156 157 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev) 158 { 159 struct mpoa_client *mpc; 160 161 mpc = mpcs; /* our global linked list */ 162 while (mpc != NULL) { 163 if (mpc->dev == dev) 164 return mpc; 165 mpc = mpc->next; 166 } 167 168 return NULL; /* not found */ 169 } 170 171 /* 172 * Functions for managing QoS list 173 */ 174 175 /* 176 * Overwrites the old entry or makes a new one. 177 */ 178 struct atm_mpoa_qos *atm_mpoa_add_qos(__be32 dst_ip, struct atm_qos *qos) 179 { 180 struct atm_mpoa_qos *entry; 181 182 entry = atm_mpoa_search_qos(dst_ip); 183 if (entry != NULL) { 184 entry->qos = *qos; 185 return entry; 186 } 187 188 entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL); 189 if (entry == NULL) { 190 pr_info("mpoa: out of memory\n"); 191 return entry; 192 } 193 194 entry->ipaddr = dst_ip; 195 entry->qos = *qos; 196 197 entry->next = qos_head; 198 qos_head = entry; 199 200 return entry; 201 } 202 203 struct atm_mpoa_qos *atm_mpoa_search_qos(__be32 dst_ip) 204 { 205 struct atm_mpoa_qos *qos; 206 207 qos = qos_head; 208 while (qos) { 209 if (qos->ipaddr == dst_ip) 210 break; 211 qos = qos->next; 212 } 213 214 return qos; 215 } 216 217 /* 218 * Returns 0 for failure 219 */ 220 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry) 221 { 222 struct atm_mpoa_qos *curr; 223 224 if (entry == NULL) 225 return 0; 226 if (entry == qos_head) { 227 qos_head = qos_head->next; 228 kfree(entry); 229 return 1; 230 } 231 232 curr = qos_head; 233 while (curr != NULL) { 234 if (curr->next == entry) { 235 curr->next = entry->next; 236 kfree(entry); 237 return 1; 238 } 239 curr = curr->next; 240 } 241 242 return 0; 243 } 244 245 /* this is buggered - we need locking for qos_head */ 246 void atm_mpoa_disp_qos(struct seq_file *m) 247 { 248 struct atm_mpoa_qos *qos; 249 250 qos = qos_head; 251 seq_printf(m, "QoS entries for shortcuts:\n"); 252 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"); 253 254 while (qos != NULL) { 255 seq_printf(m, "%pI4\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n", 256 &qos->ipaddr, 257 qos->qos.txtp.max_pcr, 258 qos->qos.txtp.pcr, 259 qos->qos.txtp.min_pcr, 260 qos->qos.txtp.max_cdv, 261 qos->qos.txtp.max_sdu, 262 qos->qos.rxtp.max_pcr, 263 qos->qos.rxtp.pcr, 264 qos->qos.rxtp.min_pcr, 265 qos->qos.rxtp.max_cdv, 266 qos->qos.rxtp.max_sdu); 267 qos = qos->next; 268 } 269 } 270 271 static struct net_device *find_lec_by_itfnum(int itf) 272 { 273 struct net_device *dev; 274 char name[IFNAMSIZ]; 275 276 sprintf(name, "lec%d", itf); 277 dev = dev_get_by_name(&init_net, name); 278 279 return dev; 280 } 281 282 static struct mpoa_client *alloc_mpc(void) 283 { 284 struct mpoa_client *mpc; 285 286 mpc = kzalloc(sizeof(struct mpoa_client), GFP_KERNEL); 287 if (mpc == NULL) 288 return NULL; 289 rwlock_init(&mpc->ingress_lock); 290 rwlock_init(&mpc->egress_lock); 291 mpc->next = mpcs; 292 atm_mpoa_init_cache(mpc); 293 294 mpc->parameters.mpc_p1 = MPC_P1; 295 mpc->parameters.mpc_p2 = MPC_P2; 296 memset(mpc->parameters.mpc_p3, 0, sizeof(mpc->parameters.mpc_p3)); 297 mpc->parameters.mpc_p4 = MPC_P4; 298 mpc->parameters.mpc_p5 = MPC_P5; 299 mpc->parameters.mpc_p6 = MPC_P6; 300 301 mpcs = mpc; 302 303 return mpc; 304 } 305 306 /* 307 * 308 * start_mpc() puts the MPC on line. All the packets destined 309 * to the lec underneath us are now being monitored and 310 * shortcuts will be established. 311 * 312 */ 313 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev) 314 { 315 316 dprintk("(%s)\n", mpc->dev->name); 317 if (!dev->netdev_ops) 318 pr_info("(%s) not starting\n", dev->name); 319 else { 320 mpc->old_ops = dev->netdev_ops; 321 mpc->new_ops = *mpc->old_ops; 322 mpc->new_ops.ndo_start_xmit = mpc_send_packet; 323 dev->netdev_ops = &mpc->new_ops; 324 } 325 } 326 327 static void stop_mpc(struct mpoa_client *mpc) 328 { 329 struct net_device *dev = mpc->dev; 330 dprintk("(%s)", mpc->dev->name); 331 332 /* Lets not nullify lec device's dev->hard_start_xmit */ 333 if (dev->netdev_ops != &mpc->new_ops) { 334 dprintk_cont(" mpc already stopped, not fatal\n"); 335 return; 336 } 337 dprintk_cont("\n"); 338 339 dev->netdev_ops = mpc->old_ops; 340 mpc->old_ops = NULL; 341 342 /* close_shortcuts(mpc); ??? FIXME */ 343 } 344 345 static const char *mpoa_device_type_string(char type) __attribute__ ((unused)); 346 347 static const char *mpoa_device_type_string(char type) 348 { 349 switch (type) { 350 case NON_MPOA: 351 return "non-MPOA device"; 352 case MPS: 353 return "MPS"; 354 case MPC: 355 return "MPC"; 356 case MPS_AND_MPC: 357 return "both MPS and MPC"; 358 } 359 360 return "unspecified (non-MPOA) device"; 361 } 362 363 /* 364 * lec device calls this via its netdev_priv(dev)->lane2_ops 365 * ->associate_indicator() when it sees a TLV in LE_ARP packet. 366 * We fill in the pointer above when we see a LANE2 lec initializing 367 * See LANE2 spec 3.1.5 368 * 369 * Quite a big and ugly function but when you look at it 370 * all it does is to try to locate and parse MPOA Device 371 * Type TLV. 372 * We give our lec a pointer to this function and when the 373 * lec sees a TLV it uses the pointer to call this function. 374 * 375 */ 376 static void lane2_assoc_ind(struct net_device *dev, const u8 *mac_addr, 377 const u8 *tlvs, u32 sizeoftlvs) 378 { 379 uint32_t type; 380 uint8_t length, mpoa_device_type, number_of_mps_macs; 381 const uint8_t *end_of_tlvs; 382 struct mpoa_client *mpc; 383 384 mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */ 385 dprintk("(%s) received TLV(s), ", dev->name); 386 dprintk("total length of all TLVs %d\n", sizeoftlvs); 387 mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */ 388 if (mpc == NULL) { 389 pr_info("(%s) no mpc\n", dev->name); 390 return; 391 } 392 end_of_tlvs = tlvs + sizeoftlvs; 393 while (end_of_tlvs - tlvs >= 5) { 394 type = ((tlvs[0] << 24) | (tlvs[1] << 16) | 395 (tlvs[2] << 8) | tlvs[3]); 396 length = tlvs[4]; 397 tlvs += 5; 398 dprintk(" type 0x%x length %02x\n", type, length); 399 if (tlvs + length > end_of_tlvs) { 400 pr_info("TLV value extends past its buffer, aborting parse\n"); 401 return; 402 } 403 404 if (type == 0) { 405 pr_info("mpoa: (%s) TLV type was 0, returning\n", 406 dev->name); 407 return; 408 } 409 410 if (type != TLV_MPOA_DEVICE_TYPE) { 411 tlvs += length; 412 continue; /* skip other TLVs */ 413 } 414 mpoa_device_type = *tlvs++; 415 number_of_mps_macs = *tlvs++; 416 dprintk("(%s) MPOA device type '%s', ", 417 dev->name, mpoa_device_type_string(mpoa_device_type)); 418 if (mpoa_device_type == MPS_AND_MPC && 419 length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */ 420 pr_info("(%s) short MPOA Device Type TLV\n", 421 dev->name); 422 continue; 423 } 424 if ((mpoa_device_type == MPS || mpoa_device_type == MPC) && 425 length < 22 + number_of_mps_macs*ETH_ALEN) { 426 pr_info("(%s) short MPOA Device Type TLV\n", dev->name); 427 continue; 428 } 429 if (mpoa_device_type != MPS && 430 mpoa_device_type != MPS_AND_MPC) { 431 dprintk("ignoring non-MPS device "); 432 if (mpoa_device_type == MPC) 433 tlvs += 20; 434 continue; /* we are only interested in MPSs */ 435 } 436 if (number_of_mps_macs == 0 && 437 mpoa_device_type == MPS_AND_MPC) { 438 pr_info("(%s) MPS_AND_MPC has zero MACs\n", dev->name); 439 continue; /* someone should read the spec */ 440 } 441 dprintk_cont("this MPS has %d MAC addresses\n", 442 number_of_mps_macs); 443 444 /* 445 * ok, now we can go and tell our daemon 446 * the control address of MPS 447 */ 448 send_set_mps_ctrl_addr(tlvs, mpc); 449 450 tlvs = copy_macs(mpc, mac_addr, tlvs, 451 number_of_mps_macs, mpoa_device_type); 452 if (tlvs == NULL) 453 return; 454 } 455 if (end_of_tlvs - tlvs != 0) 456 pr_info("(%s) ignoring %Zd bytes of trailing TLV garbage\n", 457 dev->name, end_of_tlvs - tlvs); 458 return; 459 } 460 461 /* 462 * Store at least advertizing router's MAC address 463 * plus the possible MAC address(es) to mpc->mps_macs. 464 * For a freshly allocated MPOA client mpc->mps_macs == 0. 465 */ 466 static const uint8_t *copy_macs(struct mpoa_client *mpc, 467 const uint8_t *router_mac, 468 const uint8_t *tlvs, uint8_t mps_macs, 469 uint8_t device_type) 470 { 471 int num_macs; 472 num_macs = (mps_macs > 1) ? mps_macs : 1; 473 474 if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */ 475 if (mpc->number_of_mps_macs != 0) 476 kfree(mpc->mps_macs); 477 mpc->number_of_mps_macs = 0; 478 mpc->mps_macs = kmalloc(num_macs * ETH_ALEN, GFP_KERNEL); 479 if (mpc->mps_macs == NULL) { 480 pr_info("(%s) out of mem\n", mpc->dev->name); 481 return NULL; 482 } 483 } 484 memcpy(mpc->mps_macs, router_mac, ETH_ALEN); 485 tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20; 486 if (mps_macs > 0) 487 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN); 488 tlvs += mps_macs*ETH_ALEN; 489 mpc->number_of_mps_macs = num_macs; 490 491 return tlvs; 492 } 493 494 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc) 495 { 496 in_cache_entry *entry; 497 struct iphdr *iph; 498 char *buff; 499 __be32 ipaddr = 0; 500 501 static struct { 502 struct llc_snap_hdr hdr; 503 __be32 tag; 504 } tagged_llc_snap_hdr = { 505 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}}, 506 0 507 }; 508 509 buff = skb->data + mpc->dev->hard_header_len; 510 iph = (struct iphdr *)buff; 511 ipaddr = iph->daddr; 512 513 ddprintk("(%s) ipaddr 0x%x\n", 514 mpc->dev->name, ipaddr); 515 516 entry = mpc->in_ops->get(ipaddr, mpc); 517 if (entry == NULL) { 518 entry = mpc->in_ops->add_entry(ipaddr, mpc); 519 if (entry != NULL) 520 mpc->in_ops->put(entry); 521 return 1; 522 } 523 /* threshold not exceeded or VCC not ready */ 524 if (mpc->in_ops->cache_hit(entry, mpc) != OPEN) { 525 ddprintk("(%s) cache_hit: returns != OPEN\n", 526 mpc->dev->name); 527 mpc->in_ops->put(entry); 528 return 1; 529 } 530 531 ddprintk("(%s) using shortcut\n", 532 mpc->dev->name); 533 /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */ 534 if (iph->ttl <= 1) { 535 ddprintk("(%s) IP ttl = %u, using LANE\n", 536 mpc->dev->name, iph->ttl); 537 mpc->in_ops->put(entry); 538 return 1; 539 } 540 iph->ttl--; 541 iph->check = 0; 542 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 543 544 if (entry->ctrl_info.tag != 0) { 545 ddprintk("(%s) adding tag 0x%x\n", 546 mpc->dev->name, entry->ctrl_info.tag); 547 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag; 548 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */ 549 skb_push(skb, sizeof(tagged_llc_snap_hdr)); 550 /* add LLC/SNAP header */ 551 skb_copy_to_linear_data(skb, &tagged_llc_snap_hdr, 552 sizeof(tagged_llc_snap_hdr)); 553 } else { 554 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */ 555 skb_push(skb, sizeof(struct llc_snap_hdr)); 556 /* add LLC/SNAP header + tag */ 557 skb_copy_to_linear_data(skb, &llc_snap_mpoa_data, 558 sizeof(struct llc_snap_hdr)); 559 } 560 561 atomic_add(skb->truesize, &sk_atm(entry->shortcut)->sk_wmem_alloc); 562 ATM_SKB(skb)->atm_options = entry->shortcut->atm_options; 563 entry->shortcut->send(entry->shortcut, skb); 564 entry->packets_fwded++; 565 mpc->in_ops->put(entry); 566 567 return 0; 568 } 569 570 /* 571 * Probably needs some error checks and locking, not sure... 572 */ 573 static netdev_tx_t mpc_send_packet(struct sk_buff *skb, 574 struct net_device *dev) 575 { 576 struct mpoa_client *mpc; 577 struct ethhdr *eth; 578 int i = 0; 579 580 mpc = find_mpc_by_lec(dev); /* this should NEVER fail */ 581 if (mpc == NULL) { 582 pr_info("(%s) no MPC found\n", dev->name); 583 goto non_ip; 584 } 585 586 eth = (struct ethhdr *)skb->data; 587 if (eth->h_proto != htons(ETH_P_IP)) 588 goto non_ip; /* Multi-Protocol Over ATM :-) */ 589 590 /* Weed out funny packets (e.g., AF_PACKET or raw). */ 591 if (skb->len < ETH_HLEN + sizeof(struct iphdr)) 592 goto non_ip; 593 skb_set_network_header(skb, ETH_HLEN); 594 if (skb->len < ETH_HLEN + ip_hdr(skb)->ihl * 4 || ip_hdr(skb)->ihl < 5) 595 goto non_ip; 596 597 while (i < mpc->number_of_mps_macs) { 598 if (!compare_ether_addr(eth->h_dest, 599 (mpc->mps_macs + i*ETH_ALEN))) 600 if (send_via_shortcut(skb, mpc) == 0) /* try shortcut */ 601 return NETDEV_TX_OK; 602 i++; 603 } 604 605 non_ip: 606 return mpc->old_ops->ndo_start_xmit(skb, dev); 607 } 608 609 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg) 610 { 611 int bytes_left; 612 struct mpoa_client *mpc; 613 struct atmmpc_ioc ioc_data; 614 in_cache_entry *in_entry; 615 __be32 ipaddr; 616 617 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc)); 618 if (bytes_left != 0) { 619 pr_info("mpoa:Short read (missed %d bytes) from userland\n", 620 bytes_left); 621 return -EFAULT; 622 } 623 ipaddr = ioc_data.ipaddr; 624 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF) 625 return -EINVAL; 626 627 mpc = find_mpc_by_itfnum(ioc_data.dev_num); 628 if (mpc == NULL) 629 return -EINVAL; 630 631 if (ioc_data.type == MPC_SOCKET_INGRESS) { 632 in_entry = mpc->in_ops->get(ipaddr, mpc); 633 if (in_entry == NULL || 634 in_entry->entry_state < INGRESS_RESOLVED) { 635 pr_info("(%s) did not find RESOLVED entry from ingress cache\n", 636 mpc->dev->name); 637 if (in_entry != NULL) 638 mpc->in_ops->put(in_entry); 639 return -EINVAL; 640 } 641 pr_info("(%s) attaching ingress SVC, entry = %pI4\n", 642 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip); 643 in_entry->shortcut = vcc; 644 mpc->in_ops->put(in_entry); 645 } else { 646 pr_info("(%s) attaching egress SVC\n", mpc->dev->name); 647 } 648 649 vcc->proto_data = mpc->dev; 650 vcc->push = mpc_push; 651 652 return 0; 653 } 654 655 /* 656 * 657 */ 658 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev) 659 { 660 struct mpoa_client *mpc; 661 in_cache_entry *in_entry; 662 eg_cache_entry *eg_entry; 663 664 mpc = find_mpc_by_lec(dev); 665 if (mpc == NULL) { 666 pr_info("(%s) close for unknown MPC\n", dev->name); 667 return; 668 } 669 670 dprintk("(%s)\n", dev->name); 671 in_entry = mpc->in_ops->get_by_vcc(vcc, mpc); 672 if (in_entry) { 673 dprintk("(%s) ingress SVC closed ip = %pI4\n", 674 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip); 675 in_entry->shortcut = NULL; 676 mpc->in_ops->put(in_entry); 677 } 678 eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc); 679 if (eg_entry) { 680 dprintk("(%s) egress SVC closed\n", mpc->dev->name); 681 eg_entry->shortcut = NULL; 682 mpc->eg_ops->put(eg_entry); 683 } 684 685 if (in_entry == NULL && eg_entry == NULL) 686 dprintk("(%s) unused vcc closed\n", dev->name); 687 688 return; 689 } 690 691 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb) 692 { 693 struct net_device *dev = (struct net_device *)vcc->proto_data; 694 struct sk_buff *new_skb; 695 eg_cache_entry *eg; 696 struct mpoa_client *mpc; 697 __be32 tag; 698 char *tmp; 699 700 ddprintk("(%s)\n", dev->name); 701 if (skb == NULL) { 702 dprintk("(%s) null skb, closing VCC\n", dev->name); 703 mpc_vcc_close(vcc, dev); 704 return; 705 } 706 707 skb->dev = dev; 708 if (memcmp(skb->data, &llc_snap_mpoa_ctrl, 709 sizeof(struct llc_snap_hdr)) == 0) { 710 struct sock *sk = sk_atm(vcc); 711 712 dprintk("(%s) control packet arrived\n", dev->name); 713 /* Pass control packets to daemon */ 714 skb_queue_tail(&sk->sk_receive_queue, skb); 715 sk->sk_data_ready(sk, skb->len); 716 return; 717 } 718 719 /* data coming over the shortcut */ 720 atm_return(vcc, skb->truesize); 721 722 mpc = find_mpc_by_lec(dev); 723 if (mpc == NULL) { 724 pr_info("(%s) unknown MPC\n", dev->name); 725 return; 726 } 727 728 if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, 729 sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */ 730 ddprintk("(%s) tagged data packet arrived\n", dev->name); 731 732 } else if (memcmp(skb->data, &llc_snap_mpoa_data, 733 sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */ 734 pr_info("(%s) Unsupported non-tagged data packet arrived. Purging\n", 735 dev->name); 736 dev_kfree_skb_any(skb); 737 return; 738 } else { 739 pr_info("(%s) garbage arrived, purging\n", dev->name); 740 dev_kfree_skb_any(skb); 741 return; 742 } 743 744 tmp = skb->data + sizeof(struct llc_snap_hdr); 745 tag = *(__be32 *)tmp; 746 747 eg = mpc->eg_ops->get_by_tag(tag, mpc); 748 if (eg == NULL) { 749 pr_info("mpoa: (%s) Didn't find egress cache entry, tag = %u\n", 750 dev->name, tag); 751 purge_egress_shortcut(vcc, NULL); 752 dev_kfree_skb_any(skb); 753 return; 754 } 755 756 /* 757 * See if ingress MPC is using shortcut we opened as a return channel. 758 * This means we have a bi-directional vcc opened by us. 759 */ 760 if (eg->shortcut == NULL) { 761 eg->shortcut = vcc; 762 pr_info("(%s) egress SVC in use\n", dev->name); 763 } 764 765 skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); 766 /* get rid of LLC/SNAP header */ 767 new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); 768 /* LLC/SNAP is shorter than MAC header :( */ 769 dev_kfree_skb_any(skb); 770 if (new_skb == NULL) { 771 mpc->eg_ops->put(eg); 772 return; 773 } 774 skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */ 775 skb_copy_to_linear_data(new_skb, eg->ctrl_info.DLL_header, 776 eg->ctrl_info.DH_length); 777 new_skb->protocol = eth_type_trans(new_skb, dev); 778 skb_reset_network_header(new_skb); 779 780 eg->latest_ip_addr = ip_hdr(new_skb)->saddr; 781 eg->packets_rcvd++; 782 mpc->eg_ops->put(eg); 783 784 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 785 netif_rx(new_skb); 786 787 return; 788 } 789 790 static struct atmdev_ops mpc_ops = { /* only send is required */ 791 .close = mpoad_close, 792 .send = msg_from_mpoad 793 }; 794 795 static struct atm_dev mpc_dev = { 796 .ops = &mpc_ops, 797 .type = "mpc", 798 .number = 42, 799 .lock = __SPIN_LOCK_UNLOCKED(mpc_dev.lock) 800 /* members not explicitly initialised will be 0 */ 801 }; 802 803 static int atm_mpoa_mpoad_attach(struct atm_vcc *vcc, int arg) 804 { 805 struct mpoa_client *mpc; 806 struct lec_priv *priv; 807 int err; 808 809 if (mpcs == NULL) { 810 init_timer(&mpc_timer); 811 mpc_timer_refresh(); 812 813 /* This lets us now how our LECs are doing */ 814 err = register_netdevice_notifier(&mpoa_notifier); 815 if (err < 0) { 816 del_timer(&mpc_timer); 817 return err; 818 } 819 } 820 821 mpc = find_mpc_by_itfnum(arg); 822 if (mpc == NULL) { 823 dprintk("allocating new mpc for itf %d\n", arg); 824 mpc = alloc_mpc(); 825 if (mpc == NULL) 826 return -ENOMEM; 827 mpc->dev_num = arg; 828 mpc->dev = find_lec_by_itfnum(arg); 829 /* NULL if there was no lec */ 830 } 831 if (mpc->mpoad_vcc) { 832 pr_info("mpoad is already present for itf %d\n", arg); 833 return -EADDRINUSE; 834 } 835 836 if (mpc->dev) { /* check if the lec is LANE2 capable */ 837 priv = netdev_priv(mpc->dev); 838 if (priv->lane_version < 2) { 839 dev_put(mpc->dev); 840 mpc->dev = NULL; 841 } else 842 priv->lane2_ops->associate_indicator = lane2_assoc_ind; 843 } 844 845 mpc->mpoad_vcc = vcc; 846 vcc->dev = &mpc_dev; 847 vcc_insert_socket(sk_atm(vcc)); 848 set_bit(ATM_VF_META, &vcc->flags); 849 set_bit(ATM_VF_READY, &vcc->flags); 850 851 if (mpc->dev) { 852 char empty[ATM_ESA_LEN]; 853 memset(empty, 0, ATM_ESA_LEN); 854 855 start_mpc(mpc, mpc->dev); 856 /* set address if mpcd e.g. gets killed and restarted. 857 * If we do not do it now we have to wait for the next LE_ARP 858 */ 859 if (memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0) 860 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc); 861 } 862 863 __module_get(THIS_MODULE); 864 return arg; 865 } 866 867 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc) 868 { 869 struct k_message mesg; 870 871 memcpy(mpc->mps_ctrl_addr, addr, ATM_ESA_LEN); 872 873 mesg.type = SET_MPS_CTRL_ADDR; 874 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN); 875 msg_to_mpoad(&mesg, mpc); 876 877 return; 878 } 879 880 static void mpoad_close(struct atm_vcc *vcc) 881 { 882 struct mpoa_client *mpc; 883 struct sk_buff *skb; 884 885 mpc = find_mpc_by_vcc(vcc); 886 if (mpc == NULL) { 887 pr_info("did not find MPC\n"); 888 return; 889 } 890 if (!mpc->mpoad_vcc) { 891 pr_info("close for non-present mpoad\n"); 892 return; 893 } 894 895 mpc->mpoad_vcc = NULL; 896 if (mpc->dev) { 897 struct lec_priv *priv = netdev_priv(mpc->dev); 898 priv->lane2_ops->associate_indicator = NULL; 899 stop_mpc(mpc); 900 dev_put(mpc->dev); 901 } 902 903 mpc->in_ops->destroy_cache(mpc); 904 mpc->eg_ops->destroy_cache(mpc); 905 906 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) { 907 atm_return(vcc, skb->truesize); 908 kfree_skb(skb); 909 } 910 911 pr_info("(%s) going down\n", 912 (mpc->dev) ? mpc->dev->name : "<unknown>"); 913 module_put(THIS_MODULE); 914 915 return; 916 } 917 918 /* 919 * 920 */ 921 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb) 922 { 923 924 struct mpoa_client *mpc = find_mpc_by_vcc(vcc); 925 struct k_message *mesg = (struct k_message *)skb->data; 926 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); 927 928 if (mpc == NULL) { 929 pr_info("no mpc found\n"); 930 return 0; 931 } 932 dprintk("(%s)", mpc->dev ? mpc->dev->name : "<unknown>"); 933 switch (mesg->type) { 934 case MPOA_RES_REPLY_RCVD: 935 dprintk_cont("mpoa_res_reply_rcvd\n"); 936 MPOA_res_reply_rcvd(mesg, mpc); 937 break; 938 case MPOA_TRIGGER_RCVD: 939 dprintk_cont("mpoa_trigger_rcvd\n"); 940 MPOA_trigger_rcvd(mesg, mpc); 941 break; 942 case INGRESS_PURGE_RCVD: 943 dprintk_cont("nhrp_purge_rcvd\n"); 944 ingress_purge_rcvd(mesg, mpc); 945 break; 946 case EGRESS_PURGE_RCVD: 947 dprintk_cont("egress_purge_reply_rcvd\n"); 948 egress_purge_rcvd(mesg, mpc); 949 break; 950 case MPS_DEATH: 951 dprintk_cont("mps_death\n"); 952 mps_death(mesg, mpc); 953 break; 954 case CACHE_IMPOS_RCVD: 955 dprintk_cont("cache_impos_rcvd\n"); 956 MPOA_cache_impos_rcvd(mesg, mpc); 957 break; 958 case SET_MPC_CTRL_ADDR: 959 dprintk_cont("set_mpc_ctrl_addr\n"); 960 set_mpc_ctrl_addr_rcvd(mesg, mpc); 961 break; 962 case SET_MPS_MAC_ADDR: 963 dprintk_cont("set_mps_mac_addr\n"); 964 set_mps_mac_addr_rcvd(mesg, mpc); 965 break; 966 case CLEAN_UP_AND_EXIT: 967 dprintk_cont("clean_up_and_exit\n"); 968 clean_up(mesg, mpc, DIE); 969 break; 970 case RELOAD: 971 dprintk_cont("reload\n"); 972 clean_up(mesg, mpc, RELOAD); 973 break; 974 case SET_MPC_PARAMS: 975 dprintk_cont("set_mpc_params\n"); 976 mpc->parameters = mesg->content.params; 977 break; 978 default: 979 dprintk_cont("unknown message %d\n", mesg->type); 980 break; 981 } 982 kfree_skb(skb); 983 984 return 0; 985 } 986 987 /* Remember that this function may not do things that sleep */ 988 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc) 989 { 990 struct sk_buff *skb; 991 struct sock *sk; 992 993 if (mpc == NULL || !mpc->mpoad_vcc) { 994 pr_info("mesg %d to a non-existent mpoad\n", mesg->type); 995 return -ENXIO; 996 } 997 998 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC); 999 if (skb == NULL) 1000 return -ENOMEM; 1001 skb_put(skb, sizeof(struct k_message)); 1002 skb_copy_to_linear_data(skb, mesg, sizeof(*mesg)); 1003 atm_force_charge(mpc->mpoad_vcc, skb->truesize); 1004 1005 sk = sk_atm(mpc->mpoad_vcc); 1006 skb_queue_tail(&sk->sk_receive_queue, skb); 1007 sk->sk_data_ready(sk, skb->len); 1008 1009 return 0; 1010 } 1011 1012 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, 1013 unsigned long event, void *dev_ptr) 1014 { 1015 struct net_device *dev; 1016 struct mpoa_client *mpc; 1017 struct lec_priv *priv; 1018 1019 dev = (struct net_device *)dev_ptr; 1020 1021 if (!net_eq(dev_net(dev), &init_net)) 1022 return NOTIFY_DONE; 1023 1024 if (dev->name == NULL || strncmp(dev->name, "lec", 3)) 1025 return NOTIFY_DONE; /* we are only interested in lec:s */ 1026 1027 switch (event) { 1028 case NETDEV_REGISTER: /* a new lec device was allocated */ 1029 priv = netdev_priv(dev); 1030 if (priv->lane_version < 2) 1031 break; 1032 priv->lane2_ops->associate_indicator = lane2_assoc_ind; 1033 mpc = find_mpc_by_itfnum(priv->itfnum); 1034 if (mpc == NULL) { 1035 dprintk("allocating new mpc for %s\n", dev->name); 1036 mpc = alloc_mpc(); 1037 if (mpc == NULL) { 1038 pr_info("no new mpc"); 1039 break; 1040 } 1041 } 1042 mpc->dev_num = priv->itfnum; 1043 mpc->dev = dev; 1044 dev_hold(dev); 1045 dprintk("(%s) was initialized\n", dev->name); 1046 break; 1047 case NETDEV_UNREGISTER: 1048 /* the lec device was deallocated */ 1049 mpc = find_mpc_by_lec(dev); 1050 if (mpc == NULL) 1051 break; 1052 dprintk("device (%s) was deallocated\n", dev->name); 1053 stop_mpc(mpc); 1054 dev_put(mpc->dev); 1055 mpc->dev = NULL; 1056 break; 1057 case NETDEV_UP: 1058 /* the dev was ifconfig'ed up */ 1059 mpc = find_mpc_by_lec(dev); 1060 if (mpc == NULL) 1061 break; 1062 if (mpc->mpoad_vcc != NULL) 1063 start_mpc(mpc, dev); 1064 break; 1065 case NETDEV_DOWN: 1066 /* the dev was ifconfig'ed down */ 1067 /* this means that the flow of packets from the 1068 * upper layer stops 1069 */ 1070 mpc = find_mpc_by_lec(dev); 1071 if (mpc == NULL) 1072 break; 1073 if (mpc->mpoad_vcc != NULL) 1074 stop_mpc(mpc); 1075 break; 1076 case NETDEV_REBOOT: 1077 case NETDEV_CHANGE: 1078 case NETDEV_CHANGEMTU: 1079 case NETDEV_CHANGEADDR: 1080 case NETDEV_GOING_DOWN: 1081 break; 1082 default: 1083 break; 1084 } 1085 1086 return NOTIFY_DONE; 1087 } 1088 1089 /* 1090 * Functions which are called after a message is received from mpcd. 1091 * Msg is reused on purpose. 1092 */ 1093 1094 1095 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1096 { 1097 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1098 in_cache_entry *entry; 1099 1100 entry = mpc->in_ops->get(dst_ip, mpc); 1101 if (entry == NULL) { 1102 entry = mpc->in_ops->add_entry(dst_ip, mpc); 1103 entry->entry_state = INGRESS_RESOLVING; 1104 msg->type = SND_MPOA_RES_RQST; 1105 msg->content.in_info = entry->ctrl_info; 1106 msg_to_mpoad(msg, mpc); 1107 do_gettimeofday(&(entry->reply_wait)); 1108 mpc->in_ops->put(entry); 1109 return; 1110 } 1111 1112 if (entry->entry_state == INGRESS_INVALID) { 1113 entry->entry_state = INGRESS_RESOLVING; 1114 msg->type = SND_MPOA_RES_RQST; 1115 msg->content.in_info = entry->ctrl_info; 1116 msg_to_mpoad(msg, mpc); 1117 do_gettimeofday(&(entry->reply_wait)); 1118 mpc->in_ops->put(entry); 1119 return; 1120 } 1121 1122 pr_info("(%s) entry already in resolving state\n", 1123 (mpc->dev) ? mpc->dev->name : "<unknown>"); 1124 mpc->in_ops->put(entry); 1125 return; 1126 } 1127 1128 /* 1129 * Things get complicated because we have to check if there's an egress 1130 * shortcut with suitable traffic parameters we could use. 1131 */ 1132 static void check_qos_and_open_shortcut(struct k_message *msg, 1133 struct mpoa_client *client, 1134 in_cache_entry *entry) 1135 { 1136 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1137 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip); 1138 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client); 1139 1140 if (eg_entry && eg_entry->shortcut) { 1141 if (eg_entry->shortcut->qos.txtp.traffic_class & 1142 msg->qos.txtp.traffic_class & 1143 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)) { 1144 if (eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR) 1145 entry->shortcut = eg_entry->shortcut; 1146 else if (eg_entry->shortcut->qos.txtp.max_pcr > 0) 1147 entry->shortcut = eg_entry->shortcut; 1148 } 1149 if (entry->shortcut) { 1150 dprintk("(%s) using egress SVC to reach %pI4\n", 1151 client->dev->name, &dst_ip); 1152 client->eg_ops->put(eg_entry); 1153 return; 1154 } 1155 } 1156 if (eg_entry != NULL) 1157 client->eg_ops->put(eg_entry); 1158 1159 /* No luck in the egress cache we must open an ingress SVC */ 1160 msg->type = OPEN_INGRESS_SVC; 1161 if (qos && 1162 (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class)) { 1163 msg->qos = qos->qos; 1164 pr_info("(%s) trying to get a CBR shortcut\n", 1165 client->dev->name); 1166 } else 1167 memset(&msg->qos, 0, sizeof(struct atm_qos)); 1168 msg_to_mpoad(msg, client); 1169 return; 1170 } 1171 1172 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1173 { 1174 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1175 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc); 1176 1177 dprintk("(%s) ip %pI4\n", 1178 mpc->dev->name, &dst_ip); 1179 ddprintk("(%s) entry = %p", 1180 mpc->dev->name, entry); 1181 if (entry == NULL) { 1182 pr_info("(%s) ARGH, received res. reply for an entry that doesn't exist.\n", 1183 mpc->dev->name); 1184 return; 1185 } 1186 ddprintk_cont(" entry_state = %d ", entry->entry_state); 1187 1188 if (entry->entry_state == INGRESS_RESOLVED) { 1189 pr_info("(%s) RESOLVED entry!\n", mpc->dev->name); 1190 mpc->in_ops->put(entry); 1191 return; 1192 } 1193 1194 entry->ctrl_info = msg->content.in_info; 1195 do_gettimeofday(&(entry->tv)); 1196 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */ 1197 entry->refresh_time = 0; 1198 ddprintk_cont("entry->shortcut = %p\n", entry->shortcut); 1199 1200 if (entry->entry_state == INGRESS_RESOLVING && 1201 entry->shortcut != NULL) { 1202 entry->entry_state = INGRESS_RESOLVED; 1203 mpc->in_ops->put(entry); 1204 return; /* Shortcut already open... */ 1205 } 1206 1207 if (entry->shortcut != NULL) { 1208 pr_info("(%s) entry->shortcut != NULL, impossible!\n", 1209 mpc->dev->name); 1210 mpc->in_ops->put(entry); 1211 return; 1212 } 1213 1214 check_qos_and_open_shortcut(msg, mpc, entry); 1215 entry->entry_state = INGRESS_RESOLVED; 1216 mpc->in_ops->put(entry); 1217 1218 return; 1219 1220 } 1221 1222 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1223 { 1224 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1225 __be32 mask = msg->ip_mask; 1226 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask); 1227 1228 if (entry == NULL) { 1229 pr_info("(%s) purge for a non-existing entry, ip = %pI4\n", 1230 mpc->dev->name, &dst_ip); 1231 return; 1232 } 1233 1234 do { 1235 dprintk("(%s) removing an ingress entry, ip = %pI4\n", 1236 mpc->dev->name, &dst_ip); 1237 write_lock_bh(&mpc->ingress_lock); 1238 mpc->in_ops->remove_entry(entry, mpc); 1239 write_unlock_bh(&mpc->ingress_lock); 1240 mpc->in_ops->put(entry); 1241 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask); 1242 } while (entry != NULL); 1243 1244 return; 1245 } 1246 1247 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1248 { 1249 __be32 cache_id = msg->content.eg_info.cache_id; 1250 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc); 1251 1252 if (entry == NULL) { 1253 dprintk("(%s) purge for a non-existing entry\n", 1254 mpc->dev->name); 1255 return; 1256 } 1257 1258 write_lock_irq(&mpc->egress_lock); 1259 mpc->eg_ops->remove_entry(entry, mpc); 1260 write_unlock_irq(&mpc->egress_lock); 1261 1262 mpc->eg_ops->put(entry); 1263 1264 return; 1265 } 1266 1267 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry) 1268 { 1269 struct sock *sk; 1270 struct k_message *purge_msg; 1271 struct sk_buff *skb; 1272 1273 dprintk("entering\n"); 1274 if (vcc == NULL) { 1275 pr_info("vcc == NULL\n"); 1276 return; 1277 } 1278 1279 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC); 1280 if (skb == NULL) { 1281 pr_info("out of memory\n"); 1282 return; 1283 } 1284 1285 skb_put(skb, sizeof(struct k_message)); 1286 memset(skb->data, 0, sizeof(struct k_message)); 1287 purge_msg = (struct k_message *)skb->data; 1288 purge_msg->type = DATA_PLANE_PURGE; 1289 if (entry != NULL) 1290 purge_msg->content.eg_info = entry->ctrl_info; 1291 1292 atm_force_charge(vcc, skb->truesize); 1293 1294 sk = sk_atm(vcc); 1295 skb_queue_tail(&sk->sk_receive_queue, skb); 1296 sk->sk_data_ready(sk, skb->len); 1297 dprintk("exiting\n"); 1298 1299 return; 1300 } 1301 1302 /* 1303 * Our MPS died. Tell our daemon to send NHRP data plane purge to each 1304 * of the egress shortcuts we have. 1305 */ 1306 static void mps_death(struct k_message *msg, struct mpoa_client *mpc) 1307 { 1308 eg_cache_entry *entry; 1309 1310 dprintk("(%s)\n", mpc->dev->name); 1311 1312 if (memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)) { 1313 pr_info("(%s) wrong MPS\n", mpc->dev->name); 1314 return; 1315 } 1316 1317 /* FIXME: This knows too much of the cache structure */ 1318 read_lock_irq(&mpc->egress_lock); 1319 entry = mpc->eg_cache; 1320 while (entry != NULL) { 1321 purge_egress_shortcut(entry->shortcut, entry); 1322 entry = entry->next; 1323 } 1324 read_unlock_irq(&mpc->egress_lock); 1325 1326 mpc->in_ops->destroy_cache(mpc); 1327 mpc->eg_ops->destroy_cache(mpc); 1328 1329 return; 1330 } 1331 1332 static void MPOA_cache_impos_rcvd(struct k_message *msg, 1333 struct mpoa_client *mpc) 1334 { 1335 uint16_t holding_time; 1336 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc); 1337 1338 holding_time = msg->content.eg_info.holding_time; 1339 dprintk("(%s) entry = %p, holding_time = %u\n", 1340 mpc->dev->name, entry, holding_time); 1341 if (entry == NULL && holding_time) { 1342 entry = mpc->eg_ops->add_entry(msg, mpc); 1343 mpc->eg_ops->put(entry); 1344 return; 1345 } 1346 if (holding_time) { 1347 mpc->eg_ops->update(entry, holding_time); 1348 return; 1349 } 1350 1351 write_lock_irq(&mpc->egress_lock); 1352 mpc->eg_ops->remove_entry(entry, mpc); 1353 write_unlock_irq(&mpc->egress_lock); 1354 1355 mpc->eg_ops->put(entry); 1356 1357 return; 1358 } 1359 1360 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, 1361 struct mpoa_client *mpc) 1362 { 1363 struct lec_priv *priv; 1364 int i, retval ; 1365 1366 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN]; 1367 1368 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */ 1369 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */ 1370 tlv[5] = 0x02; /* MPOA client */ 1371 tlv[6] = 0x00; /* number of MPS MAC addresses */ 1372 1373 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */ 1374 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN); 1375 1376 dprintk("(%s) setting MPC ctrl ATM address to", 1377 mpc->dev ? mpc->dev->name : "<unknown>"); 1378 for (i = 7; i < sizeof(tlv); i++) 1379 dprintk_cont(" %02x", tlv[i]); 1380 dprintk_cont("\n"); 1381 1382 if (mpc->dev) { 1383 priv = netdev_priv(mpc->dev); 1384 retval = priv->lane2_ops->associate_req(mpc->dev, 1385 mpc->dev->dev_addr, 1386 tlv, sizeof(tlv)); 1387 if (retval == 0) 1388 pr_info("(%s) MPOA device type TLV association failed\n", 1389 mpc->dev->name); 1390 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL); 1391 if (retval < 0) 1392 pr_info("(%s) targetless LE_ARP request failed\n", 1393 mpc->dev->name); 1394 } 1395 1396 return; 1397 } 1398 1399 static void set_mps_mac_addr_rcvd(struct k_message *msg, 1400 struct mpoa_client *client) 1401 { 1402 1403 if (client->number_of_mps_macs) 1404 kfree(client->mps_macs); 1405 client->number_of_mps_macs = 0; 1406 client->mps_macs = kmemdup(msg->MPS_ctrl, ETH_ALEN, GFP_KERNEL); 1407 if (client->mps_macs == NULL) { 1408 pr_info("out of memory\n"); 1409 return; 1410 } 1411 client->number_of_mps_macs = 1; 1412 1413 return; 1414 } 1415 1416 /* 1417 * purge egress cache and tell daemon to 'action' (DIE, RELOAD) 1418 */ 1419 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action) 1420 { 1421 1422 eg_cache_entry *entry; 1423 msg->type = SND_EGRESS_PURGE; 1424 1425 1426 /* FIXME: This knows too much of the cache structure */ 1427 read_lock_irq(&mpc->egress_lock); 1428 entry = mpc->eg_cache; 1429 while (entry != NULL) { 1430 msg->content.eg_info = entry->ctrl_info; 1431 dprintk("cache_id %u\n", entry->ctrl_info.cache_id); 1432 msg_to_mpoad(msg, mpc); 1433 entry = entry->next; 1434 } 1435 read_unlock_irq(&mpc->egress_lock); 1436 1437 msg->type = action; 1438 msg_to_mpoad(msg, mpc); 1439 return; 1440 } 1441 1442 static void mpc_timer_refresh(void) 1443 { 1444 mpc_timer.expires = jiffies + (MPC_P2 * HZ); 1445 mpc_timer.data = mpc_timer.expires; 1446 mpc_timer.function = mpc_cache_check; 1447 add_timer(&mpc_timer); 1448 1449 return; 1450 } 1451 1452 static void mpc_cache_check(unsigned long checking_time) 1453 { 1454 struct mpoa_client *mpc = mpcs; 1455 static unsigned long previous_resolving_check_time; 1456 static unsigned long previous_refresh_time; 1457 1458 while (mpc != NULL) { 1459 mpc->in_ops->clear_count(mpc); 1460 mpc->eg_ops->clear_expired(mpc); 1461 if (checking_time - previous_resolving_check_time > 1462 mpc->parameters.mpc_p4 * HZ) { 1463 mpc->in_ops->check_resolving(mpc); 1464 previous_resolving_check_time = checking_time; 1465 } 1466 if (checking_time - previous_refresh_time > 1467 mpc->parameters.mpc_p5 * HZ) { 1468 mpc->in_ops->refresh(mpc); 1469 previous_refresh_time = checking_time; 1470 } 1471 mpc = mpc->next; 1472 } 1473 mpc_timer_refresh(); 1474 1475 return; 1476 } 1477 1478 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd, 1479 unsigned long arg) 1480 { 1481 int err = 0; 1482 struct atm_vcc *vcc = ATM_SD(sock); 1483 1484 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA) 1485 return -ENOIOCTLCMD; 1486 1487 if (!capable(CAP_NET_ADMIN)) 1488 return -EPERM; 1489 1490 switch (cmd) { 1491 case ATMMPC_CTRL: 1492 err = atm_mpoa_mpoad_attach(vcc, (int)arg); 1493 if (err >= 0) 1494 sock->state = SS_CONNECTED; 1495 break; 1496 case ATMMPC_DATA: 1497 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg); 1498 break; 1499 default: 1500 break; 1501 } 1502 return err; 1503 } 1504 1505 static struct atm_ioctl atm_ioctl_ops = { 1506 .owner = THIS_MODULE, 1507 .ioctl = atm_mpoa_ioctl, 1508 }; 1509 1510 static __init int atm_mpoa_init(void) 1511 { 1512 register_atm_ioctl(&atm_ioctl_ops); 1513 1514 if (mpc_proc_init() != 0) 1515 pr_info("failed to initialize /proc/mpoa\n"); 1516 1517 pr_info("mpc.c: " __DATE__ " " __TIME__ " initialized\n"); 1518 1519 return 0; 1520 } 1521 1522 static void __exit atm_mpoa_cleanup(void) 1523 { 1524 struct mpoa_client *mpc, *tmp; 1525 struct atm_mpoa_qos *qos, *nextqos; 1526 struct lec_priv *priv; 1527 1528 mpc_proc_clean(); 1529 1530 del_timer(&mpc_timer); 1531 unregister_netdevice_notifier(&mpoa_notifier); 1532 deregister_atm_ioctl(&atm_ioctl_ops); 1533 1534 mpc = mpcs; 1535 mpcs = NULL; 1536 while (mpc != NULL) { 1537 tmp = mpc->next; 1538 if (mpc->dev != NULL) { 1539 stop_mpc(mpc); 1540 priv = netdev_priv(mpc->dev); 1541 if (priv->lane2_ops != NULL) 1542 priv->lane2_ops->associate_indicator = NULL; 1543 } 1544 ddprintk("about to clear caches\n"); 1545 mpc->in_ops->destroy_cache(mpc); 1546 mpc->eg_ops->destroy_cache(mpc); 1547 ddprintk("caches cleared\n"); 1548 kfree(mpc->mps_macs); 1549 memset(mpc, 0, sizeof(struct mpoa_client)); 1550 ddprintk("about to kfree %p\n", mpc); 1551 kfree(mpc); 1552 ddprintk("next mpc is at %p\n", tmp); 1553 mpc = tmp; 1554 } 1555 1556 qos = qos_head; 1557 qos_head = NULL; 1558 while (qos != NULL) { 1559 nextqos = qos->next; 1560 dprintk("freeing qos entry %p\n", qos); 1561 kfree(qos); 1562 qos = nextqos; 1563 } 1564 1565 return; 1566 } 1567 1568 module_init(atm_mpoa_init); 1569 module_exit(atm_mpoa_cleanup); 1570 1571 MODULE_LICENSE("GPL"); 1572