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