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 } 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 } 687 688 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb) 689 { 690 struct net_device *dev = (struct net_device *)vcc->proto_data; 691 struct sk_buff *new_skb; 692 eg_cache_entry *eg; 693 struct mpoa_client *mpc; 694 __be32 tag; 695 char *tmp; 696 697 ddprintk("(%s)\n", dev->name); 698 if (skb == NULL) { 699 dprintk("(%s) null skb, closing VCC\n", dev->name); 700 mpc_vcc_close(vcc, dev); 701 return; 702 } 703 704 skb->dev = dev; 705 if (memcmp(skb->data, &llc_snap_mpoa_ctrl, 706 sizeof(struct llc_snap_hdr)) == 0) { 707 struct sock *sk = sk_atm(vcc); 708 709 dprintk("(%s) control packet arrived\n", dev->name); 710 /* Pass control packets to daemon */ 711 skb_queue_tail(&sk->sk_receive_queue, skb); 712 sk->sk_data_ready(sk, skb->len); 713 return; 714 } 715 716 /* data coming over the shortcut */ 717 atm_return(vcc, skb->truesize); 718 719 mpc = find_mpc_by_lec(dev); 720 if (mpc == NULL) { 721 pr_info("(%s) unknown MPC\n", dev->name); 722 return; 723 } 724 725 if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, 726 sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */ 727 ddprintk("(%s) tagged data packet arrived\n", dev->name); 728 729 } else if (memcmp(skb->data, &llc_snap_mpoa_data, 730 sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */ 731 pr_info("(%s) Unsupported non-tagged data packet arrived. Purging\n", 732 dev->name); 733 dev_kfree_skb_any(skb); 734 return; 735 } else { 736 pr_info("(%s) garbage arrived, purging\n", dev->name); 737 dev_kfree_skb_any(skb); 738 return; 739 } 740 741 tmp = skb->data + sizeof(struct llc_snap_hdr); 742 tag = *(__be32 *)tmp; 743 744 eg = mpc->eg_ops->get_by_tag(tag, mpc); 745 if (eg == NULL) { 746 pr_info("mpoa: (%s) Didn't find egress cache entry, tag = %u\n", 747 dev->name, tag); 748 purge_egress_shortcut(vcc, NULL); 749 dev_kfree_skb_any(skb); 750 return; 751 } 752 753 /* 754 * See if ingress MPC is using shortcut we opened as a return channel. 755 * This means we have a bi-directional vcc opened by us. 756 */ 757 if (eg->shortcut == NULL) { 758 eg->shortcut = vcc; 759 pr_info("(%s) egress SVC in use\n", dev->name); 760 } 761 762 skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); 763 /* get rid of LLC/SNAP header */ 764 new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); 765 /* LLC/SNAP is shorter than MAC header :( */ 766 dev_kfree_skb_any(skb); 767 if (new_skb == NULL) { 768 mpc->eg_ops->put(eg); 769 return; 770 } 771 skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */ 772 skb_copy_to_linear_data(new_skb, eg->ctrl_info.DLL_header, 773 eg->ctrl_info.DH_length); 774 new_skb->protocol = eth_type_trans(new_skb, dev); 775 skb_reset_network_header(new_skb); 776 777 eg->latest_ip_addr = ip_hdr(new_skb)->saddr; 778 eg->packets_rcvd++; 779 mpc->eg_ops->put(eg); 780 781 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); 782 netif_rx(new_skb); 783 } 784 785 static struct atmdev_ops mpc_ops = { /* only send is required */ 786 .close = mpoad_close, 787 .send = msg_from_mpoad 788 }; 789 790 static struct atm_dev mpc_dev = { 791 .ops = &mpc_ops, 792 .type = "mpc", 793 .number = 42, 794 .lock = __SPIN_LOCK_UNLOCKED(mpc_dev.lock) 795 /* members not explicitly initialised will be 0 */ 796 }; 797 798 static int atm_mpoa_mpoad_attach(struct atm_vcc *vcc, int arg) 799 { 800 struct mpoa_client *mpc; 801 struct lec_priv *priv; 802 int err; 803 804 if (mpcs == NULL) { 805 init_timer(&mpc_timer); 806 mpc_timer_refresh(); 807 808 /* This lets us now how our LECs are doing */ 809 err = register_netdevice_notifier(&mpoa_notifier); 810 if (err < 0) { 811 del_timer(&mpc_timer); 812 return err; 813 } 814 } 815 816 mpc = find_mpc_by_itfnum(arg); 817 if (mpc == NULL) { 818 dprintk("allocating new mpc for itf %d\n", arg); 819 mpc = alloc_mpc(); 820 if (mpc == NULL) 821 return -ENOMEM; 822 mpc->dev_num = arg; 823 mpc->dev = find_lec_by_itfnum(arg); 824 /* NULL if there was no lec */ 825 } 826 if (mpc->mpoad_vcc) { 827 pr_info("mpoad is already present for itf %d\n", arg); 828 return -EADDRINUSE; 829 } 830 831 if (mpc->dev) { /* check if the lec is LANE2 capable */ 832 priv = netdev_priv(mpc->dev); 833 if (priv->lane_version < 2) { 834 dev_put(mpc->dev); 835 mpc->dev = NULL; 836 } else 837 priv->lane2_ops->associate_indicator = lane2_assoc_ind; 838 } 839 840 mpc->mpoad_vcc = vcc; 841 vcc->dev = &mpc_dev; 842 vcc_insert_socket(sk_atm(vcc)); 843 set_bit(ATM_VF_META, &vcc->flags); 844 set_bit(ATM_VF_READY, &vcc->flags); 845 846 if (mpc->dev) { 847 char empty[ATM_ESA_LEN]; 848 memset(empty, 0, ATM_ESA_LEN); 849 850 start_mpc(mpc, mpc->dev); 851 /* set address if mpcd e.g. gets killed and restarted. 852 * If we do not do it now we have to wait for the next LE_ARP 853 */ 854 if (memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0) 855 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc); 856 } 857 858 __module_get(THIS_MODULE); 859 return arg; 860 } 861 862 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc) 863 { 864 struct k_message mesg; 865 866 memcpy(mpc->mps_ctrl_addr, addr, ATM_ESA_LEN); 867 868 mesg.type = SET_MPS_CTRL_ADDR; 869 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN); 870 msg_to_mpoad(&mesg, mpc); 871 } 872 873 static void mpoad_close(struct atm_vcc *vcc) 874 { 875 struct mpoa_client *mpc; 876 struct sk_buff *skb; 877 878 mpc = find_mpc_by_vcc(vcc); 879 if (mpc == NULL) { 880 pr_info("did not find MPC\n"); 881 return; 882 } 883 if (!mpc->mpoad_vcc) { 884 pr_info("close for non-present mpoad\n"); 885 return; 886 } 887 888 mpc->mpoad_vcc = NULL; 889 if (mpc->dev) { 890 struct lec_priv *priv = netdev_priv(mpc->dev); 891 priv->lane2_ops->associate_indicator = NULL; 892 stop_mpc(mpc); 893 dev_put(mpc->dev); 894 } 895 896 mpc->in_ops->destroy_cache(mpc); 897 mpc->eg_ops->destroy_cache(mpc); 898 899 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) { 900 atm_return(vcc, skb->truesize); 901 kfree_skb(skb); 902 } 903 904 pr_info("(%s) going down\n", 905 (mpc->dev) ? mpc->dev->name : "<unknown>"); 906 module_put(THIS_MODULE); 907 } 908 909 /* 910 * 911 */ 912 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb) 913 { 914 915 struct mpoa_client *mpc = find_mpc_by_vcc(vcc); 916 struct k_message *mesg = (struct k_message *)skb->data; 917 atomic_sub(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); 918 919 if (mpc == NULL) { 920 pr_info("no mpc found\n"); 921 return 0; 922 } 923 dprintk("(%s)", mpc->dev ? mpc->dev->name : "<unknown>"); 924 switch (mesg->type) { 925 case MPOA_RES_REPLY_RCVD: 926 dprintk_cont("mpoa_res_reply_rcvd\n"); 927 MPOA_res_reply_rcvd(mesg, mpc); 928 break; 929 case MPOA_TRIGGER_RCVD: 930 dprintk_cont("mpoa_trigger_rcvd\n"); 931 MPOA_trigger_rcvd(mesg, mpc); 932 break; 933 case INGRESS_PURGE_RCVD: 934 dprintk_cont("nhrp_purge_rcvd\n"); 935 ingress_purge_rcvd(mesg, mpc); 936 break; 937 case EGRESS_PURGE_RCVD: 938 dprintk_cont("egress_purge_reply_rcvd\n"); 939 egress_purge_rcvd(mesg, mpc); 940 break; 941 case MPS_DEATH: 942 dprintk_cont("mps_death\n"); 943 mps_death(mesg, mpc); 944 break; 945 case CACHE_IMPOS_RCVD: 946 dprintk_cont("cache_impos_rcvd\n"); 947 MPOA_cache_impos_rcvd(mesg, mpc); 948 break; 949 case SET_MPC_CTRL_ADDR: 950 dprintk_cont("set_mpc_ctrl_addr\n"); 951 set_mpc_ctrl_addr_rcvd(mesg, mpc); 952 break; 953 case SET_MPS_MAC_ADDR: 954 dprintk_cont("set_mps_mac_addr\n"); 955 set_mps_mac_addr_rcvd(mesg, mpc); 956 break; 957 case CLEAN_UP_AND_EXIT: 958 dprintk_cont("clean_up_and_exit\n"); 959 clean_up(mesg, mpc, DIE); 960 break; 961 case RELOAD: 962 dprintk_cont("reload\n"); 963 clean_up(mesg, mpc, RELOAD); 964 break; 965 case SET_MPC_PARAMS: 966 dprintk_cont("set_mpc_params\n"); 967 mpc->parameters = mesg->content.params; 968 break; 969 default: 970 dprintk_cont("unknown message %d\n", mesg->type); 971 break; 972 } 973 kfree_skb(skb); 974 975 return 0; 976 } 977 978 /* Remember that this function may not do things that sleep */ 979 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc) 980 { 981 struct sk_buff *skb; 982 struct sock *sk; 983 984 if (mpc == NULL || !mpc->mpoad_vcc) { 985 pr_info("mesg %d to a non-existent mpoad\n", mesg->type); 986 return -ENXIO; 987 } 988 989 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC); 990 if (skb == NULL) 991 return -ENOMEM; 992 skb_put(skb, sizeof(struct k_message)); 993 skb_copy_to_linear_data(skb, mesg, sizeof(*mesg)); 994 atm_force_charge(mpc->mpoad_vcc, skb->truesize); 995 996 sk = sk_atm(mpc->mpoad_vcc); 997 skb_queue_tail(&sk->sk_receive_queue, skb); 998 sk->sk_data_ready(sk, skb->len); 999 1000 return 0; 1001 } 1002 1003 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, 1004 unsigned long event, void *dev_ptr) 1005 { 1006 struct net_device *dev; 1007 struct mpoa_client *mpc; 1008 struct lec_priv *priv; 1009 1010 dev = (struct net_device *)dev_ptr; 1011 1012 if (!net_eq(dev_net(dev), &init_net)) 1013 return NOTIFY_DONE; 1014 1015 if (dev->name == NULL || strncmp(dev->name, "lec", 3)) 1016 return NOTIFY_DONE; /* we are only interested in lec:s */ 1017 1018 switch (event) { 1019 case NETDEV_REGISTER: /* a new lec device was allocated */ 1020 priv = netdev_priv(dev); 1021 if (priv->lane_version < 2) 1022 break; 1023 priv->lane2_ops->associate_indicator = lane2_assoc_ind; 1024 mpc = find_mpc_by_itfnum(priv->itfnum); 1025 if (mpc == NULL) { 1026 dprintk("allocating new mpc for %s\n", dev->name); 1027 mpc = alloc_mpc(); 1028 if (mpc == NULL) { 1029 pr_info("no new mpc"); 1030 break; 1031 } 1032 } 1033 mpc->dev_num = priv->itfnum; 1034 mpc->dev = dev; 1035 dev_hold(dev); 1036 dprintk("(%s) was initialized\n", dev->name); 1037 break; 1038 case NETDEV_UNREGISTER: 1039 /* the lec device was deallocated */ 1040 mpc = find_mpc_by_lec(dev); 1041 if (mpc == NULL) 1042 break; 1043 dprintk("device (%s) was deallocated\n", dev->name); 1044 stop_mpc(mpc); 1045 dev_put(mpc->dev); 1046 mpc->dev = NULL; 1047 break; 1048 case NETDEV_UP: 1049 /* the dev was ifconfig'ed up */ 1050 mpc = find_mpc_by_lec(dev); 1051 if (mpc == NULL) 1052 break; 1053 if (mpc->mpoad_vcc != NULL) 1054 start_mpc(mpc, dev); 1055 break; 1056 case NETDEV_DOWN: 1057 /* the dev was ifconfig'ed down */ 1058 /* this means that the flow of packets from the 1059 * upper layer stops 1060 */ 1061 mpc = find_mpc_by_lec(dev); 1062 if (mpc == NULL) 1063 break; 1064 if (mpc->mpoad_vcc != NULL) 1065 stop_mpc(mpc); 1066 break; 1067 case NETDEV_REBOOT: 1068 case NETDEV_CHANGE: 1069 case NETDEV_CHANGEMTU: 1070 case NETDEV_CHANGEADDR: 1071 case NETDEV_GOING_DOWN: 1072 break; 1073 default: 1074 break; 1075 } 1076 1077 return NOTIFY_DONE; 1078 } 1079 1080 /* 1081 * Functions which are called after a message is received from mpcd. 1082 * Msg is reused on purpose. 1083 */ 1084 1085 1086 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1087 { 1088 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1089 in_cache_entry *entry; 1090 1091 entry = mpc->in_ops->get(dst_ip, mpc); 1092 if (entry == NULL) { 1093 entry = mpc->in_ops->add_entry(dst_ip, mpc); 1094 entry->entry_state = INGRESS_RESOLVING; 1095 msg->type = SND_MPOA_RES_RQST; 1096 msg->content.in_info = entry->ctrl_info; 1097 msg_to_mpoad(msg, mpc); 1098 do_gettimeofday(&(entry->reply_wait)); 1099 mpc->in_ops->put(entry); 1100 return; 1101 } 1102 1103 if (entry->entry_state == INGRESS_INVALID) { 1104 entry->entry_state = INGRESS_RESOLVING; 1105 msg->type = SND_MPOA_RES_RQST; 1106 msg->content.in_info = entry->ctrl_info; 1107 msg_to_mpoad(msg, mpc); 1108 do_gettimeofday(&(entry->reply_wait)); 1109 mpc->in_ops->put(entry); 1110 return; 1111 } 1112 1113 pr_info("(%s) entry already in resolving state\n", 1114 (mpc->dev) ? mpc->dev->name : "<unknown>"); 1115 mpc->in_ops->put(entry); 1116 } 1117 1118 /* 1119 * Things get complicated because we have to check if there's an egress 1120 * shortcut with suitable traffic parameters we could use. 1121 */ 1122 static void check_qos_and_open_shortcut(struct k_message *msg, 1123 struct mpoa_client *client, 1124 in_cache_entry *entry) 1125 { 1126 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1127 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip); 1128 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client); 1129 1130 if (eg_entry && eg_entry->shortcut) { 1131 if (eg_entry->shortcut->qos.txtp.traffic_class & 1132 msg->qos.txtp.traffic_class & 1133 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)) { 1134 if (eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR) 1135 entry->shortcut = eg_entry->shortcut; 1136 else if (eg_entry->shortcut->qos.txtp.max_pcr > 0) 1137 entry->shortcut = eg_entry->shortcut; 1138 } 1139 if (entry->shortcut) { 1140 dprintk("(%s) using egress SVC to reach %pI4\n", 1141 client->dev->name, &dst_ip); 1142 client->eg_ops->put(eg_entry); 1143 return; 1144 } 1145 } 1146 if (eg_entry != NULL) 1147 client->eg_ops->put(eg_entry); 1148 1149 /* No luck in the egress cache we must open an ingress SVC */ 1150 msg->type = OPEN_INGRESS_SVC; 1151 if (qos && 1152 (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class)) { 1153 msg->qos = qos->qos; 1154 pr_info("(%s) trying to get a CBR shortcut\n", 1155 client->dev->name); 1156 } else 1157 memset(&msg->qos, 0, sizeof(struct atm_qos)); 1158 msg_to_mpoad(msg, client); 1159 } 1160 1161 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1162 { 1163 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1164 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc); 1165 1166 dprintk("(%s) ip %pI4\n", 1167 mpc->dev->name, &dst_ip); 1168 ddprintk("(%s) entry = %p", 1169 mpc->dev->name, entry); 1170 if (entry == NULL) { 1171 pr_info("(%s) ARGH, received res. reply for an entry that doesn't exist.\n", 1172 mpc->dev->name); 1173 return; 1174 } 1175 ddprintk_cont(" entry_state = %d ", entry->entry_state); 1176 1177 if (entry->entry_state == INGRESS_RESOLVED) { 1178 pr_info("(%s) RESOLVED entry!\n", mpc->dev->name); 1179 mpc->in_ops->put(entry); 1180 return; 1181 } 1182 1183 entry->ctrl_info = msg->content.in_info; 1184 do_gettimeofday(&(entry->tv)); 1185 do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */ 1186 entry->refresh_time = 0; 1187 ddprintk_cont("entry->shortcut = %p\n", entry->shortcut); 1188 1189 if (entry->entry_state == INGRESS_RESOLVING && 1190 entry->shortcut != NULL) { 1191 entry->entry_state = INGRESS_RESOLVED; 1192 mpc->in_ops->put(entry); 1193 return; /* Shortcut already open... */ 1194 } 1195 1196 if (entry->shortcut != NULL) { 1197 pr_info("(%s) entry->shortcut != NULL, impossible!\n", 1198 mpc->dev->name); 1199 mpc->in_ops->put(entry); 1200 return; 1201 } 1202 1203 check_qos_and_open_shortcut(msg, mpc, entry); 1204 entry->entry_state = INGRESS_RESOLVED; 1205 mpc->in_ops->put(entry); 1206 1207 return; 1208 1209 } 1210 1211 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1212 { 1213 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1214 __be32 mask = msg->ip_mask; 1215 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask); 1216 1217 if (entry == NULL) { 1218 pr_info("(%s) purge for a non-existing entry, ip = %pI4\n", 1219 mpc->dev->name, &dst_ip); 1220 return; 1221 } 1222 1223 do { 1224 dprintk("(%s) removing an ingress entry, ip = %pI4\n", 1225 mpc->dev->name, &dst_ip); 1226 write_lock_bh(&mpc->ingress_lock); 1227 mpc->in_ops->remove_entry(entry, mpc); 1228 write_unlock_bh(&mpc->ingress_lock); 1229 mpc->in_ops->put(entry); 1230 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask); 1231 } while (entry != NULL); 1232 } 1233 1234 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1235 { 1236 __be32 cache_id = msg->content.eg_info.cache_id; 1237 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc); 1238 1239 if (entry == NULL) { 1240 dprintk("(%s) purge for a non-existing entry\n", 1241 mpc->dev->name); 1242 return; 1243 } 1244 1245 write_lock_irq(&mpc->egress_lock); 1246 mpc->eg_ops->remove_entry(entry, mpc); 1247 write_unlock_irq(&mpc->egress_lock); 1248 1249 mpc->eg_ops->put(entry); 1250 } 1251 1252 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry) 1253 { 1254 struct sock *sk; 1255 struct k_message *purge_msg; 1256 struct sk_buff *skb; 1257 1258 dprintk("entering\n"); 1259 if (vcc == NULL) { 1260 pr_info("vcc == NULL\n"); 1261 return; 1262 } 1263 1264 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC); 1265 if (skb == NULL) { 1266 pr_info("out of memory\n"); 1267 return; 1268 } 1269 1270 skb_put(skb, sizeof(struct k_message)); 1271 memset(skb->data, 0, sizeof(struct k_message)); 1272 purge_msg = (struct k_message *)skb->data; 1273 purge_msg->type = DATA_PLANE_PURGE; 1274 if (entry != NULL) 1275 purge_msg->content.eg_info = entry->ctrl_info; 1276 1277 atm_force_charge(vcc, skb->truesize); 1278 1279 sk = sk_atm(vcc); 1280 skb_queue_tail(&sk->sk_receive_queue, skb); 1281 sk->sk_data_ready(sk, skb->len); 1282 dprintk("exiting\n"); 1283 } 1284 1285 /* 1286 * Our MPS died. Tell our daemon to send NHRP data plane purge to each 1287 * of the egress shortcuts we have. 1288 */ 1289 static void mps_death(struct k_message *msg, struct mpoa_client *mpc) 1290 { 1291 eg_cache_entry *entry; 1292 1293 dprintk("(%s)\n", mpc->dev->name); 1294 1295 if (memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)) { 1296 pr_info("(%s) wrong MPS\n", mpc->dev->name); 1297 return; 1298 } 1299 1300 /* FIXME: This knows too much of the cache structure */ 1301 read_lock_irq(&mpc->egress_lock); 1302 entry = mpc->eg_cache; 1303 while (entry != NULL) { 1304 purge_egress_shortcut(entry->shortcut, entry); 1305 entry = entry->next; 1306 } 1307 read_unlock_irq(&mpc->egress_lock); 1308 1309 mpc->in_ops->destroy_cache(mpc); 1310 mpc->eg_ops->destroy_cache(mpc); 1311 } 1312 1313 static void MPOA_cache_impos_rcvd(struct k_message *msg, 1314 struct mpoa_client *mpc) 1315 { 1316 uint16_t holding_time; 1317 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc); 1318 1319 holding_time = msg->content.eg_info.holding_time; 1320 dprintk("(%s) entry = %p, holding_time = %u\n", 1321 mpc->dev->name, entry, holding_time); 1322 if (entry == NULL && holding_time) { 1323 entry = mpc->eg_ops->add_entry(msg, mpc); 1324 mpc->eg_ops->put(entry); 1325 return; 1326 } 1327 if (holding_time) { 1328 mpc->eg_ops->update(entry, holding_time); 1329 return; 1330 } 1331 1332 write_lock_irq(&mpc->egress_lock); 1333 mpc->eg_ops->remove_entry(entry, mpc); 1334 write_unlock_irq(&mpc->egress_lock); 1335 1336 mpc->eg_ops->put(entry); 1337 } 1338 1339 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, 1340 struct mpoa_client *mpc) 1341 { 1342 struct lec_priv *priv; 1343 int i, retval ; 1344 1345 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN]; 1346 1347 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */ 1348 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */ 1349 tlv[5] = 0x02; /* MPOA client */ 1350 tlv[6] = 0x00; /* number of MPS MAC addresses */ 1351 1352 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */ 1353 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN); 1354 1355 dprintk("(%s) setting MPC ctrl ATM address to", 1356 mpc->dev ? mpc->dev->name : "<unknown>"); 1357 for (i = 7; i < sizeof(tlv); i++) 1358 dprintk_cont(" %02x", tlv[i]); 1359 dprintk_cont("\n"); 1360 1361 if (mpc->dev) { 1362 priv = netdev_priv(mpc->dev); 1363 retval = priv->lane2_ops->associate_req(mpc->dev, 1364 mpc->dev->dev_addr, 1365 tlv, sizeof(tlv)); 1366 if (retval == 0) 1367 pr_info("(%s) MPOA device type TLV association failed\n", 1368 mpc->dev->name); 1369 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL); 1370 if (retval < 0) 1371 pr_info("(%s) targetless LE_ARP request failed\n", 1372 mpc->dev->name); 1373 } 1374 } 1375 1376 static void set_mps_mac_addr_rcvd(struct k_message *msg, 1377 struct mpoa_client *client) 1378 { 1379 1380 if (client->number_of_mps_macs) 1381 kfree(client->mps_macs); 1382 client->number_of_mps_macs = 0; 1383 client->mps_macs = kmemdup(msg->MPS_ctrl, ETH_ALEN, GFP_KERNEL); 1384 if (client->mps_macs == NULL) { 1385 pr_info("out of memory\n"); 1386 return; 1387 } 1388 client->number_of_mps_macs = 1; 1389 } 1390 1391 /* 1392 * purge egress cache and tell daemon to 'action' (DIE, RELOAD) 1393 */ 1394 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action) 1395 { 1396 1397 eg_cache_entry *entry; 1398 msg->type = SND_EGRESS_PURGE; 1399 1400 1401 /* FIXME: This knows too much of the cache structure */ 1402 read_lock_irq(&mpc->egress_lock); 1403 entry = mpc->eg_cache; 1404 while (entry != NULL) { 1405 msg->content.eg_info = entry->ctrl_info; 1406 dprintk("cache_id %u\n", entry->ctrl_info.cache_id); 1407 msg_to_mpoad(msg, mpc); 1408 entry = entry->next; 1409 } 1410 read_unlock_irq(&mpc->egress_lock); 1411 1412 msg->type = action; 1413 msg_to_mpoad(msg, mpc); 1414 } 1415 1416 static void mpc_timer_refresh(void) 1417 { 1418 mpc_timer.expires = jiffies + (MPC_P2 * HZ); 1419 mpc_timer.data = mpc_timer.expires; 1420 mpc_timer.function = mpc_cache_check; 1421 add_timer(&mpc_timer); 1422 } 1423 1424 static void mpc_cache_check(unsigned long checking_time) 1425 { 1426 struct mpoa_client *mpc = mpcs; 1427 static unsigned long previous_resolving_check_time; 1428 static unsigned long previous_refresh_time; 1429 1430 while (mpc != NULL) { 1431 mpc->in_ops->clear_count(mpc); 1432 mpc->eg_ops->clear_expired(mpc); 1433 if (checking_time - previous_resolving_check_time > 1434 mpc->parameters.mpc_p4 * HZ) { 1435 mpc->in_ops->check_resolving(mpc); 1436 previous_resolving_check_time = checking_time; 1437 } 1438 if (checking_time - previous_refresh_time > 1439 mpc->parameters.mpc_p5 * HZ) { 1440 mpc->in_ops->refresh(mpc); 1441 previous_refresh_time = checking_time; 1442 } 1443 mpc = mpc->next; 1444 } 1445 mpc_timer_refresh(); 1446 } 1447 1448 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd, 1449 unsigned long arg) 1450 { 1451 int err = 0; 1452 struct atm_vcc *vcc = ATM_SD(sock); 1453 1454 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA) 1455 return -ENOIOCTLCMD; 1456 1457 if (!capable(CAP_NET_ADMIN)) 1458 return -EPERM; 1459 1460 switch (cmd) { 1461 case ATMMPC_CTRL: 1462 err = atm_mpoa_mpoad_attach(vcc, (int)arg); 1463 if (err >= 0) 1464 sock->state = SS_CONNECTED; 1465 break; 1466 case ATMMPC_DATA: 1467 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg); 1468 break; 1469 default: 1470 break; 1471 } 1472 return err; 1473 } 1474 1475 static struct atm_ioctl atm_ioctl_ops = { 1476 .owner = THIS_MODULE, 1477 .ioctl = atm_mpoa_ioctl, 1478 }; 1479 1480 static __init int atm_mpoa_init(void) 1481 { 1482 register_atm_ioctl(&atm_ioctl_ops); 1483 1484 if (mpc_proc_init() != 0) 1485 pr_info("failed to initialize /proc/mpoa\n"); 1486 1487 pr_info("mpc.c: " __DATE__ " " __TIME__ " initialized\n"); 1488 1489 return 0; 1490 } 1491 1492 static void __exit atm_mpoa_cleanup(void) 1493 { 1494 struct mpoa_client *mpc, *tmp; 1495 struct atm_mpoa_qos *qos, *nextqos; 1496 struct lec_priv *priv; 1497 1498 mpc_proc_clean(); 1499 1500 del_timer(&mpc_timer); 1501 unregister_netdevice_notifier(&mpoa_notifier); 1502 deregister_atm_ioctl(&atm_ioctl_ops); 1503 1504 mpc = mpcs; 1505 mpcs = NULL; 1506 while (mpc != NULL) { 1507 tmp = mpc->next; 1508 if (mpc->dev != NULL) { 1509 stop_mpc(mpc); 1510 priv = netdev_priv(mpc->dev); 1511 if (priv->lane2_ops != NULL) 1512 priv->lane2_ops->associate_indicator = NULL; 1513 } 1514 ddprintk("about to clear caches\n"); 1515 mpc->in_ops->destroy_cache(mpc); 1516 mpc->eg_ops->destroy_cache(mpc); 1517 ddprintk("caches cleared\n"); 1518 kfree(mpc->mps_macs); 1519 memset(mpc, 0, sizeof(struct mpoa_client)); 1520 ddprintk("about to kfree %p\n", mpc); 1521 kfree(mpc); 1522 ddprintk("next mpc is at %p\n", tmp); 1523 mpc = tmp; 1524 } 1525 1526 qos = qos_head; 1527 qos_head = NULL; 1528 while (qos != NULL) { 1529 nextqos = qos->next; 1530 dprintk("freeing qos entry %p\n", qos); 1531 kfree(qos); 1532 qos = nextqos; 1533 } 1534 } 1535 1536 module_init(atm_mpoa_init); 1537 module_exit(atm_mpoa_cleanup); 1538 1539 MODULE_LICENSE("GPL"); 1540