1 // SPDX-License-Identifier: GPL-2.0-only 2 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ 3 4 #include <linux/kernel.h> 5 #include <linux/string.h> 6 #include <linux/slab.h> 7 #include <linux/timer.h> 8 #include <linux/init.h> 9 #include <linux/bitops.h> 10 #include <linux/capability.h> 11 #include <linux/seq_file.h> 12 13 /* We are an ethernet device */ 14 #include <linux/if_ether.h> 15 #include <linux/netdevice.h> 16 #include <linux/etherdevice.h> 17 #include <net/sock.h> 18 #include <linux/skbuff.h> 19 #include <linux/ip.h> 20 #include <linux/uaccess.h> 21 #include <asm/byteorder.h> 22 #include <net/checksum.h> /* for ip_fast_csum() */ 23 #include <net/arp.h> 24 #include <net/dst.h> 25 #include <linux/proc_fs.h> 26 27 /* And atm device */ 28 #include <linux/atmdev.h> 29 #include <linux/atmlec.h> 30 #include <linux/atmmpc.h> 31 /* Modular too */ 32 #include <linux/module.h> 33 34 #include "lec.h" 35 #include "mpc.h" 36 #include "resources.h" 37 38 /* 39 * mpc.c: Implementation of MPOA client kernel part 40 */ 41 42 #if 0 43 #define dprintk(format, args...) \ 44 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args) 45 #define dprintk_cont(format, args...) printk(KERN_CONT format, ##args) 46 #else 47 #define dprintk(format, args...) \ 48 do { if (0) \ 49 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\ 50 } while (0) 51 #define dprintk_cont(format, args...) \ 52 do { if (0) printk(KERN_CONT format, ##args); } while (0) 53 #endif 54 55 #if 0 56 #define ddprintk(format, args...) \ 57 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args) 58 #define ddprintk_cont(format, args...) printk(KERN_CONT format, ##args) 59 #else 60 #define ddprintk(format, args...) \ 61 do { if (0) \ 62 printk(KERN_DEBUG "mpoa:%s: " format, __func__, ##args);\ 63 } while (0) 64 #define ddprintk_cont(format, args...) \ 65 do { if (0) printk(KERN_CONT format, ##args); } while (0) 66 #endif 67 68 /* mpc_daemon -> kernel */ 69 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc); 70 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc); 71 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc); 72 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc); 73 static void mps_death(struct k_message *msg, struct mpoa_client *mpc); 74 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, 75 int action); 76 static void MPOA_cache_impos_rcvd(struct k_message *msg, 77 struct mpoa_client *mpc); 78 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, 79 struct mpoa_client *mpc); 80 static void set_mps_mac_addr_rcvd(struct k_message *mesg, 81 struct mpoa_client *mpc); 82 83 static const uint8_t *copy_macs(struct mpoa_client *mpc, 84 const uint8_t *router_mac, 85 const uint8_t *tlvs, uint8_t mps_macs, 86 uint8_t device_type); 87 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry); 88 89 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc); 90 static void mpoad_close(struct atm_vcc *vcc); 91 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb); 92 93 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb); 94 static netdev_tx_t mpc_send_packet(struct sk_buff *skb, 95 struct net_device *dev); 96 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, 97 unsigned long event, void *dev); 98 static void mpc_timer_refresh(void); 99 static void mpc_cache_check(struct timer_list *unused); 100 101 static struct llc_snap_hdr llc_snap_mpoa_ctrl = { 102 0xaa, 0xaa, 0x03, 103 {0x00, 0x00, 0x5e}, 104 {0x00, 0x03} /* For MPOA control PDUs */ 105 }; 106 static struct llc_snap_hdr llc_snap_mpoa_data = { 107 0xaa, 0xaa, 0x03, 108 {0x00, 0x00, 0x00}, 109 {0x08, 0x00} /* This is for IP PDUs only */ 110 }; 111 static struct llc_snap_hdr llc_snap_mpoa_data_tagged = { 112 0xaa, 0xaa, 0x03, 113 {0x00, 0x00, 0x00}, 114 {0x88, 0x4c} /* This is for tagged data PDUs */ 115 }; 116 117 static struct notifier_block mpoa_notifier = { 118 mpoa_event_listener, 119 NULL, 120 0 121 }; 122 123 struct mpoa_client *mpcs = NULL; /* FIXME */ 124 static struct atm_mpoa_qos *qos_head = NULL; 125 static DEFINE_TIMER(mpc_timer, mpc_cache_check); 126 127 128 static struct mpoa_client *find_mpc_by_itfnum(int itf) 129 { 130 struct mpoa_client *mpc; 131 132 mpc = mpcs; /* our global linked list */ 133 while (mpc != NULL) { 134 if (mpc->dev_num == itf) 135 return mpc; 136 mpc = mpc->next; 137 } 138 139 return NULL; /* not found */ 140 } 141 142 static struct mpoa_client *find_mpc_by_vcc(struct atm_vcc *vcc) 143 { 144 struct mpoa_client *mpc; 145 146 mpc = mpcs; /* our global linked list */ 147 while (mpc != NULL) { 148 if (mpc->mpoad_vcc == vcc) 149 return mpc; 150 mpc = mpc->next; 151 } 152 153 return NULL; /* not found */ 154 } 155 156 static struct mpoa_client *find_mpc_by_lec(struct net_device *dev) 157 { 158 struct mpoa_client *mpc; 159 160 mpc = mpcs; /* our global linked list */ 161 while (mpc != NULL) { 162 if (mpc->dev == dev) 163 return mpc; 164 mpc = mpc->next; 165 } 166 167 return NULL; /* not found */ 168 } 169 170 /* 171 * Functions for managing QoS list 172 */ 173 174 /* 175 * Overwrites the old entry or makes a new one. 176 */ 177 struct atm_mpoa_qos *atm_mpoa_add_qos(__be32 dst_ip, struct atm_qos *qos) 178 { 179 struct atm_mpoa_qos *entry; 180 181 entry = atm_mpoa_search_qos(dst_ip); 182 if (entry != NULL) { 183 entry->qos = *qos; 184 return entry; 185 } 186 187 entry = kmalloc(sizeof(struct atm_mpoa_qos), GFP_KERNEL); 188 if (entry == NULL) { 189 pr_info("mpoa: out of memory\n"); 190 return entry; 191 } 192 193 entry->ipaddr = dst_ip; 194 entry->qos = *qos; 195 196 entry->next = qos_head; 197 qos_head = entry; 198 199 return entry; 200 } 201 202 struct atm_mpoa_qos *atm_mpoa_search_qos(__be32 dst_ip) 203 { 204 struct atm_mpoa_qos *qos; 205 206 qos = qos_head; 207 while (qos) { 208 if (qos->ipaddr == dst_ip) 209 break; 210 qos = qos->next; 211 } 212 213 return qos; 214 } 215 216 /* 217 * Returns 0 for failure 218 */ 219 int atm_mpoa_delete_qos(struct atm_mpoa_qos *entry) 220 { 221 struct atm_mpoa_qos *curr; 222 223 if (entry == NULL) 224 return 0; 225 if (entry == qos_head) { 226 qos_head = qos_head->next; 227 kfree(entry); 228 return 1; 229 } 230 231 curr = qos_head; 232 while (curr != NULL) { 233 if (curr->next == entry) { 234 curr->next = entry->next; 235 kfree(entry); 236 return 1; 237 } 238 curr = curr->next; 239 } 240 241 return 0; 242 } 243 244 /* this is buggered - we need locking for qos_head */ 245 void atm_mpoa_disp_qos(struct seq_file *m) 246 { 247 struct atm_mpoa_qos *qos; 248 249 qos = qos_head; 250 seq_printf(m, "QoS entries for shortcuts:\n"); 251 seq_printf(m, "IP address\n TX:max_pcr pcr min_pcr max_cdv max_sdu\n RX:max_pcr pcr min_pcr max_cdv max_sdu\n"); 252 253 while (qos != NULL) { 254 seq_printf(m, "%pI4\n %-7d %-7d %-7d %-7d %-7d\n %-7d %-7d %-7d %-7d %-7d\n", 255 &qos->ipaddr, 256 qos->qos.txtp.max_pcr, 257 qos->qos.txtp.pcr, 258 qos->qos.txtp.min_pcr, 259 qos->qos.txtp.max_cdv, 260 qos->qos.txtp.max_sdu, 261 qos->qos.rxtp.max_pcr, 262 qos->qos.rxtp.pcr, 263 qos->qos.rxtp.min_pcr, 264 qos->qos.rxtp.max_cdv, 265 qos->qos.rxtp.max_sdu); 266 qos = qos->next; 267 } 268 } 269 270 static struct net_device *find_lec_by_itfnum(int itf) 271 { 272 struct net_device *dev; 273 char name[IFNAMSIZ]; 274 275 sprintf(name, "lec%d", itf); 276 dev = dev_get_by_name(&init_net, name); 277 278 return dev; 279 } 280 281 static struct mpoa_client *alloc_mpc(void) 282 { 283 struct mpoa_client *mpc; 284 285 mpc = kzalloc(sizeof(struct mpoa_client), GFP_KERNEL); 286 if (mpc == NULL) 287 return NULL; 288 rwlock_init(&mpc->ingress_lock); 289 rwlock_init(&mpc->egress_lock); 290 mpc->next = mpcs; 291 atm_mpoa_init_cache(mpc); 292 293 mpc->parameters.mpc_p1 = MPC_P1; 294 mpc->parameters.mpc_p2 = MPC_P2; 295 memset(mpc->parameters.mpc_p3, 0, sizeof(mpc->parameters.mpc_p3)); 296 mpc->parameters.mpc_p4 = MPC_P4; 297 mpc->parameters.mpc_p5 = MPC_P5; 298 mpc->parameters.mpc_p6 = MPC_P6; 299 300 mpcs = mpc; 301 302 return mpc; 303 } 304 305 /* 306 * 307 * start_mpc() puts the MPC on line. All the packets destined 308 * to the lec underneath us are now being monitored and 309 * shortcuts will be established. 310 * 311 */ 312 static void start_mpc(struct mpoa_client *mpc, struct net_device *dev) 313 { 314 315 dprintk("(%s)\n", mpc->dev->name); 316 if (!dev->netdev_ops) 317 pr_info("(%s) not starting\n", dev->name); 318 else { 319 mpc->old_ops = dev->netdev_ops; 320 mpc->new_ops = *mpc->old_ops; 321 mpc->new_ops.ndo_start_xmit = mpc_send_packet; 322 dev->netdev_ops = &mpc->new_ops; 323 } 324 } 325 326 static void stop_mpc(struct mpoa_client *mpc) 327 { 328 struct net_device *dev = mpc->dev; 329 dprintk("(%s)", mpc->dev->name); 330 331 /* Lets not nullify lec device's dev->hard_start_xmit */ 332 if (dev->netdev_ops != &mpc->new_ops) { 333 dprintk_cont(" mpc already stopped, not fatal\n"); 334 return; 335 } 336 dprintk_cont("\n"); 337 338 dev->netdev_ops = mpc->old_ops; 339 mpc->old_ops = NULL; 340 341 /* close_shortcuts(mpc); ??? FIXME */ 342 } 343 344 static const char *mpoa_device_type_string(char type) __attribute__ ((unused)); 345 346 static const char *mpoa_device_type_string(char type) 347 { 348 switch (type) { 349 case NON_MPOA: 350 return "non-MPOA device"; 351 case MPS: 352 return "MPS"; 353 case MPC: 354 return "MPC"; 355 case MPS_AND_MPC: 356 return "both MPS and MPC"; 357 } 358 359 return "unspecified (non-MPOA) device"; 360 } 361 362 /* 363 * lec device calls this via its netdev_priv(dev)->lane2_ops 364 * ->associate_indicator() when it sees a TLV in LE_ARP packet. 365 * We fill in the pointer above when we see a LANE2 lec initializing 366 * See LANE2 spec 3.1.5 367 * 368 * Quite a big and ugly function but when you look at it 369 * all it does is to try to locate and parse MPOA Device 370 * Type TLV. 371 * We give our lec a pointer to this function and when the 372 * lec sees a TLV it uses the pointer to call this function. 373 * 374 */ 375 static void lane2_assoc_ind(struct net_device *dev, const u8 *mac_addr, 376 const u8 *tlvs, u32 sizeoftlvs) 377 { 378 uint32_t type; 379 uint8_t length, mpoa_device_type, number_of_mps_macs; 380 const uint8_t *end_of_tlvs; 381 struct mpoa_client *mpc; 382 383 mpoa_device_type = number_of_mps_macs = 0; /* silence gcc */ 384 dprintk("(%s) received TLV(s), ", dev->name); 385 dprintk("total length of all TLVs %d\n", sizeoftlvs); 386 mpc = find_mpc_by_lec(dev); /* Sampo-Fix: moved here from below */ 387 if (mpc == NULL) { 388 pr_info("(%s) no mpc\n", dev->name); 389 return; 390 } 391 end_of_tlvs = tlvs + sizeoftlvs; 392 while (end_of_tlvs - tlvs >= 5) { 393 type = ((tlvs[0] << 24) | (tlvs[1] << 16) | 394 (tlvs[2] << 8) | tlvs[3]); 395 length = tlvs[4]; 396 tlvs += 5; 397 dprintk(" type 0x%x length %02x\n", type, length); 398 if (tlvs + length > end_of_tlvs) { 399 pr_info("TLV value extends past its buffer, aborting parse\n"); 400 return; 401 } 402 403 if (type == 0) { 404 pr_info("mpoa: (%s) TLV type was 0, returning\n", 405 dev->name); 406 return; 407 } 408 409 if (type != TLV_MPOA_DEVICE_TYPE) { 410 tlvs += length; 411 continue; /* skip other TLVs */ 412 } 413 mpoa_device_type = *tlvs++; 414 number_of_mps_macs = *tlvs++; 415 dprintk("(%s) MPOA device type '%s', ", 416 dev->name, mpoa_device_type_string(mpoa_device_type)); 417 if (mpoa_device_type == MPS_AND_MPC && 418 length < (42 + number_of_mps_macs*ETH_ALEN)) { /* :) */ 419 pr_info("(%s) short MPOA Device Type TLV\n", 420 dev->name); 421 continue; 422 } 423 if ((mpoa_device_type == MPS || mpoa_device_type == MPC) && 424 length < 22 + number_of_mps_macs*ETH_ALEN) { 425 pr_info("(%s) short MPOA Device Type TLV\n", dev->name); 426 continue; 427 } 428 if (mpoa_device_type != MPS && 429 mpoa_device_type != MPS_AND_MPC) { 430 dprintk("ignoring non-MPS device "); 431 if (mpoa_device_type == MPC) 432 tlvs += 20; 433 continue; /* we are only interested in MPSs */ 434 } 435 if (number_of_mps_macs == 0 && 436 mpoa_device_type == MPS_AND_MPC) { 437 pr_info("(%s) MPS_AND_MPC has zero MACs\n", dev->name); 438 continue; /* someone should read the spec */ 439 } 440 dprintk_cont("this MPS has %d MAC addresses\n", 441 number_of_mps_macs); 442 443 /* 444 * ok, now we can go and tell our daemon 445 * the control address of MPS 446 */ 447 send_set_mps_ctrl_addr(tlvs, mpc); 448 449 tlvs = copy_macs(mpc, mac_addr, tlvs, 450 number_of_mps_macs, mpoa_device_type); 451 if (tlvs == NULL) 452 return; 453 } 454 if (end_of_tlvs - tlvs != 0) 455 pr_info("(%s) ignoring %zd bytes of trailing TLV garbage\n", 456 dev->name, end_of_tlvs - tlvs); 457 } 458 459 /* 460 * Store at least advertizing router's MAC address 461 * plus the possible MAC address(es) to mpc->mps_macs. 462 * For a freshly allocated MPOA client mpc->mps_macs == 0. 463 */ 464 static const uint8_t *copy_macs(struct mpoa_client *mpc, 465 const uint8_t *router_mac, 466 const uint8_t *tlvs, uint8_t mps_macs, 467 uint8_t device_type) 468 { 469 int num_macs; 470 num_macs = (mps_macs > 1) ? mps_macs : 1; 471 472 if (mpc->number_of_mps_macs != num_macs) { /* need to reallocate? */ 473 if (mpc->number_of_mps_macs != 0) 474 kfree(mpc->mps_macs); 475 mpc->number_of_mps_macs = 0; 476 mpc->mps_macs = kmalloc_array(ETH_ALEN, num_macs, GFP_KERNEL); 477 if (mpc->mps_macs == NULL) { 478 pr_info("(%s) out of mem\n", mpc->dev->name); 479 return NULL; 480 } 481 } 482 ether_addr_copy(mpc->mps_macs, router_mac); 483 tlvs += 20; if (device_type == MPS_AND_MPC) tlvs += 20; 484 if (mps_macs > 0) 485 memcpy(mpc->mps_macs, tlvs, mps_macs*ETH_ALEN); 486 tlvs += mps_macs*ETH_ALEN; 487 mpc->number_of_mps_macs = num_macs; 488 489 return tlvs; 490 } 491 492 static int send_via_shortcut(struct sk_buff *skb, struct mpoa_client *mpc) 493 { 494 in_cache_entry *entry; 495 struct iphdr *iph; 496 char *buff; 497 __be32 ipaddr = 0; 498 499 static struct { 500 struct llc_snap_hdr hdr; 501 __be32 tag; 502 } tagged_llc_snap_hdr = { 503 {0xaa, 0xaa, 0x03, {0x00, 0x00, 0x00}, {0x88, 0x4c}}, 504 0 505 }; 506 507 buff = skb->data + mpc->dev->hard_header_len; 508 iph = (struct iphdr *)buff; 509 ipaddr = iph->daddr; 510 511 ddprintk("(%s) ipaddr 0x%x\n", 512 mpc->dev->name, ipaddr); 513 514 entry = mpc->in_ops->get(ipaddr, mpc); 515 if (entry == NULL) { 516 entry = mpc->in_ops->add_entry(ipaddr, mpc); 517 if (entry != NULL) 518 mpc->in_ops->put(entry); 519 return 1; 520 } 521 /* threshold not exceeded or VCC not ready */ 522 if (mpc->in_ops->cache_hit(entry, mpc) != OPEN) { 523 ddprintk("(%s) cache_hit: returns != OPEN\n", 524 mpc->dev->name); 525 mpc->in_ops->put(entry); 526 return 1; 527 } 528 529 ddprintk("(%s) using shortcut\n", 530 mpc->dev->name); 531 /* MPOA spec A.1.4, MPOA client must decrement IP ttl at least by one */ 532 if (iph->ttl <= 1) { 533 ddprintk("(%s) IP ttl = %u, using LANE\n", 534 mpc->dev->name, iph->ttl); 535 mpc->in_ops->put(entry); 536 return 1; 537 } 538 iph->ttl--; 539 iph->check = 0; 540 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 541 542 if (entry->ctrl_info.tag != 0) { 543 ddprintk("(%s) adding tag 0x%x\n", 544 mpc->dev->name, entry->ctrl_info.tag); 545 tagged_llc_snap_hdr.tag = entry->ctrl_info.tag; 546 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */ 547 skb_push(skb, sizeof(tagged_llc_snap_hdr)); 548 /* add LLC/SNAP header */ 549 skb_copy_to_linear_data(skb, &tagged_llc_snap_hdr, 550 sizeof(tagged_llc_snap_hdr)); 551 } else { 552 skb_pull(skb, ETH_HLEN); /* get rid of Eth header */ 553 skb_push(skb, sizeof(struct llc_snap_hdr)); 554 /* add LLC/SNAP header + tag */ 555 skb_copy_to_linear_data(skb, &llc_snap_mpoa_data, 556 sizeof(struct llc_snap_hdr)); 557 } 558 559 atm_account_tx(entry->shortcut, skb); 560 entry->shortcut->send(entry->shortcut, skb); 561 entry->packets_fwded++; 562 mpc->in_ops->put(entry); 563 564 return 0; 565 } 566 567 /* 568 * Probably needs some error checks and locking, not sure... 569 */ 570 static netdev_tx_t mpc_send_packet(struct sk_buff *skb, 571 struct net_device *dev) 572 { 573 struct mpoa_client *mpc; 574 struct ethhdr *eth; 575 int i = 0; 576 577 mpc = find_mpc_by_lec(dev); /* this should NEVER fail */ 578 if (mpc == NULL) { 579 pr_info("(%s) no MPC found\n", dev->name); 580 goto non_ip; 581 } 582 583 eth = (struct ethhdr *)skb->data; 584 if (eth->h_proto != htons(ETH_P_IP)) 585 goto non_ip; /* Multi-Protocol Over ATM :-) */ 586 587 /* Weed out funny packets (e.g., AF_PACKET or raw). */ 588 if (skb->len < ETH_HLEN + sizeof(struct iphdr)) 589 goto non_ip; 590 skb_set_network_header(skb, ETH_HLEN); 591 if (skb->len < ETH_HLEN + ip_hdr(skb)->ihl * 4 || ip_hdr(skb)->ihl < 5) 592 goto non_ip; 593 594 while (i < mpc->number_of_mps_macs) { 595 if (ether_addr_equal(eth->h_dest, mpc->mps_macs + i * ETH_ALEN)) 596 if (send_via_shortcut(skb, mpc) == 0) /* try shortcut */ 597 return NETDEV_TX_OK; 598 i++; 599 } 600 601 non_ip: 602 return __netdev_start_xmit(mpc->old_ops, skb, dev, false); 603 } 604 605 static int atm_mpoa_vcc_attach(struct atm_vcc *vcc, void __user *arg) 606 { 607 int bytes_left; 608 struct mpoa_client *mpc; 609 struct atmmpc_ioc ioc_data; 610 in_cache_entry *in_entry; 611 __be32 ipaddr; 612 613 bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmmpc_ioc)); 614 if (bytes_left != 0) { 615 pr_info("mpoa:Short read (missed %d bytes) from userland\n", 616 bytes_left); 617 return -EFAULT; 618 } 619 ipaddr = ioc_data.ipaddr; 620 if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF) 621 return -EINVAL; 622 623 mpc = find_mpc_by_itfnum(ioc_data.dev_num); 624 if (mpc == NULL) 625 return -EINVAL; 626 627 if (ioc_data.type == MPC_SOCKET_INGRESS) { 628 in_entry = mpc->in_ops->get(ipaddr, mpc); 629 if (in_entry == NULL || 630 in_entry->entry_state < INGRESS_RESOLVED) { 631 pr_info("(%s) did not find RESOLVED entry from ingress cache\n", 632 mpc->dev->name); 633 if (in_entry != NULL) 634 mpc->in_ops->put(in_entry); 635 return -EINVAL; 636 } 637 pr_info("(%s) attaching ingress SVC, entry = %pI4\n", 638 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip); 639 in_entry->shortcut = vcc; 640 mpc->in_ops->put(in_entry); 641 } else { 642 pr_info("(%s) attaching egress SVC\n", mpc->dev->name); 643 } 644 645 vcc->proto_data = mpc->dev; 646 vcc->push = mpc_push; 647 648 return 0; 649 } 650 651 /* 652 * 653 */ 654 static void mpc_vcc_close(struct atm_vcc *vcc, struct net_device *dev) 655 { 656 struct mpoa_client *mpc; 657 in_cache_entry *in_entry; 658 eg_cache_entry *eg_entry; 659 660 mpc = find_mpc_by_lec(dev); 661 if (mpc == NULL) { 662 pr_info("(%s) close for unknown MPC\n", dev->name); 663 return; 664 } 665 666 dprintk("(%s)\n", dev->name); 667 in_entry = mpc->in_ops->get_by_vcc(vcc, mpc); 668 if (in_entry) { 669 dprintk("(%s) ingress SVC closed ip = %pI4\n", 670 mpc->dev->name, &in_entry->ctrl_info.in_dst_ip); 671 in_entry->shortcut = NULL; 672 mpc->in_ops->put(in_entry); 673 } 674 eg_entry = mpc->eg_ops->get_by_vcc(vcc, mpc); 675 if (eg_entry) { 676 dprintk("(%s) egress SVC closed\n", mpc->dev->name); 677 eg_entry->shortcut = NULL; 678 mpc->eg_ops->put(eg_entry); 679 } 680 681 if (in_entry == NULL && eg_entry == NULL) 682 dprintk("(%s) unused vcc closed\n", dev->name); 683 } 684 685 static void mpc_push(struct atm_vcc *vcc, struct sk_buff *skb) 686 { 687 struct net_device *dev = (struct net_device *)vcc->proto_data; 688 struct sk_buff *new_skb; 689 eg_cache_entry *eg; 690 struct mpoa_client *mpc; 691 __be32 tag; 692 char *tmp; 693 694 ddprintk("(%s)\n", dev->name); 695 if (skb == NULL) { 696 dprintk("(%s) null skb, closing VCC\n", dev->name); 697 mpc_vcc_close(vcc, dev); 698 return; 699 } 700 701 skb->dev = dev; 702 if (memcmp(skb->data, &llc_snap_mpoa_ctrl, 703 sizeof(struct llc_snap_hdr)) == 0) { 704 struct sock *sk = sk_atm(vcc); 705 706 dprintk("(%s) control packet arrived\n", dev->name); 707 /* Pass control packets to daemon */ 708 skb_queue_tail(&sk->sk_receive_queue, skb); 709 sk->sk_data_ready(sk); 710 return; 711 } 712 713 /* data coming over the shortcut */ 714 atm_return(vcc, skb->truesize); 715 716 mpc = find_mpc_by_lec(dev); 717 if (mpc == NULL) { 718 pr_info("(%s) unknown MPC\n", dev->name); 719 return; 720 } 721 722 if (memcmp(skb->data, &llc_snap_mpoa_data_tagged, 723 sizeof(struct llc_snap_hdr)) == 0) { /* MPOA tagged data */ 724 ddprintk("(%s) tagged data packet arrived\n", dev->name); 725 726 } else if (memcmp(skb->data, &llc_snap_mpoa_data, 727 sizeof(struct llc_snap_hdr)) == 0) { /* MPOA data */ 728 pr_info("(%s) Unsupported non-tagged data packet arrived. Purging\n", 729 dev->name); 730 dev_kfree_skb_any(skb); 731 return; 732 } else { 733 pr_info("(%s) garbage arrived, purging\n", dev->name); 734 dev_kfree_skb_any(skb); 735 return; 736 } 737 738 tmp = skb->data + sizeof(struct llc_snap_hdr); 739 tag = *(__be32 *)tmp; 740 741 eg = mpc->eg_ops->get_by_tag(tag, mpc); 742 if (eg == NULL) { 743 pr_info("mpoa: (%s) Didn't find egress cache entry, tag = %u\n", 744 dev->name, tag); 745 purge_egress_shortcut(vcc, NULL); 746 dev_kfree_skb_any(skb); 747 return; 748 } 749 750 /* 751 * See if ingress MPC is using shortcut we opened as a return channel. 752 * This means we have a bi-directional vcc opened by us. 753 */ 754 if (eg->shortcut == NULL) { 755 eg->shortcut = vcc; 756 pr_info("(%s) egress SVC in use\n", dev->name); 757 } 758 759 skb_pull(skb, sizeof(struct llc_snap_hdr) + sizeof(tag)); 760 /* get rid of LLC/SNAP header */ 761 new_skb = skb_realloc_headroom(skb, eg->ctrl_info.DH_length); 762 /* LLC/SNAP is shorter than MAC header :( */ 763 dev_kfree_skb_any(skb); 764 if (new_skb == NULL) { 765 mpc->eg_ops->put(eg); 766 return; 767 } 768 skb_push(new_skb, eg->ctrl_info.DH_length); /* add MAC header */ 769 skb_copy_to_linear_data(new_skb, eg->ctrl_info.DLL_header, 770 eg->ctrl_info.DH_length); 771 new_skb->protocol = eth_type_trans(new_skb, dev); 772 skb_reset_network_header(new_skb); 773 774 eg->latest_ip_addr = ip_hdr(new_skb)->saddr; 775 eg->packets_rcvd++; 776 mpc->eg_ops->put(eg); 777 778 memset(ATM_SKB(new_skb), 0, sizeof(struct atm_skb_data)); 779 netif_rx(new_skb); 780 } 781 782 static const struct atmdev_ops mpc_ops = { /* only send is required */ 783 .close = mpoad_close, 784 .send = msg_from_mpoad 785 }; 786 787 static struct atm_dev mpc_dev = { 788 .ops = &mpc_ops, 789 .type = "mpc", 790 .number = 42, 791 .lock = __SPIN_LOCK_UNLOCKED(mpc_dev.lock) 792 /* members not explicitly initialised will be 0 */ 793 }; 794 795 static int atm_mpoa_mpoad_attach(struct atm_vcc *vcc, int arg) 796 { 797 struct mpoa_client *mpc; 798 struct lec_priv *priv; 799 int err; 800 801 if (mpcs == NULL) { 802 mpc_timer_refresh(); 803 804 /* This lets us now how our LECs are doing */ 805 err = register_netdevice_notifier(&mpoa_notifier); 806 if (err < 0) { 807 del_timer(&mpc_timer); 808 return err; 809 } 810 } 811 812 mpc = find_mpc_by_itfnum(arg); 813 if (mpc == NULL) { 814 dprintk("allocating new mpc for itf %d\n", arg); 815 mpc = alloc_mpc(); 816 if (mpc == NULL) 817 return -ENOMEM; 818 mpc->dev_num = arg; 819 mpc->dev = find_lec_by_itfnum(arg); 820 /* NULL if there was no lec */ 821 } 822 if (mpc->mpoad_vcc) { 823 pr_info("mpoad is already present for itf %d\n", arg); 824 return -EADDRINUSE; 825 } 826 827 if (mpc->dev) { /* check if the lec is LANE2 capable */ 828 priv = netdev_priv(mpc->dev); 829 if (priv->lane_version < 2) { 830 dev_put(mpc->dev); 831 mpc->dev = NULL; 832 } else 833 priv->lane2_ops->associate_indicator = lane2_assoc_ind; 834 } 835 836 mpc->mpoad_vcc = vcc; 837 vcc->dev = &mpc_dev; 838 vcc_insert_socket(sk_atm(vcc)); 839 set_bit(ATM_VF_META, &vcc->flags); 840 set_bit(ATM_VF_READY, &vcc->flags); 841 842 if (mpc->dev) { 843 char empty[ATM_ESA_LEN]; 844 memset(empty, 0, ATM_ESA_LEN); 845 846 start_mpc(mpc, mpc->dev); 847 /* set address if mpcd e.g. gets killed and restarted. 848 * If we do not do it now we have to wait for the next LE_ARP 849 */ 850 if (memcmp(mpc->mps_ctrl_addr, empty, ATM_ESA_LEN) != 0) 851 send_set_mps_ctrl_addr(mpc->mps_ctrl_addr, mpc); 852 } 853 854 __module_get(THIS_MODULE); 855 return arg; 856 } 857 858 static void send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc) 859 { 860 struct k_message mesg; 861 862 memcpy(mpc->mps_ctrl_addr, addr, ATM_ESA_LEN); 863 864 mesg.type = SET_MPS_CTRL_ADDR; 865 memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN); 866 msg_to_mpoad(&mesg, mpc); 867 } 868 869 static void mpoad_close(struct atm_vcc *vcc) 870 { 871 struct mpoa_client *mpc; 872 struct sk_buff *skb; 873 874 mpc = find_mpc_by_vcc(vcc); 875 if (mpc == NULL) { 876 pr_info("did not find MPC\n"); 877 return; 878 } 879 if (!mpc->mpoad_vcc) { 880 pr_info("close for non-present mpoad\n"); 881 return; 882 } 883 884 mpc->mpoad_vcc = NULL; 885 if (mpc->dev) { 886 struct lec_priv *priv = netdev_priv(mpc->dev); 887 priv->lane2_ops->associate_indicator = NULL; 888 stop_mpc(mpc); 889 dev_put(mpc->dev); 890 } 891 892 mpc->in_ops->destroy_cache(mpc); 893 mpc->eg_ops->destroy_cache(mpc); 894 895 while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue))) { 896 atm_return(vcc, skb->truesize); 897 kfree_skb(skb); 898 } 899 900 pr_info("(%s) going down\n", 901 (mpc->dev) ? mpc->dev->name : "<unknown>"); 902 module_put(THIS_MODULE); 903 } 904 905 /* 906 * 907 */ 908 static int msg_from_mpoad(struct atm_vcc *vcc, struct sk_buff *skb) 909 { 910 911 struct mpoa_client *mpc = find_mpc_by_vcc(vcc); 912 struct k_message *mesg = (struct k_message *)skb->data; 913 WARN_ON(refcount_sub_and_test(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc)); 914 915 if (mpc == NULL) { 916 pr_info("no mpc found\n"); 917 return 0; 918 } 919 dprintk("(%s)", mpc->dev ? mpc->dev->name : "<unknown>"); 920 switch (mesg->type) { 921 case MPOA_RES_REPLY_RCVD: 922 dprintk_cont("mpoa_res_reply_rcvd\n"); 923 MPOA_res_reply_rcvd(mesg, mpc); 924 break; 925 case MPOA_TRIGGER_RCVD: 926 dprintk_cont("mpoa_trigger_rcvd\n"); 927 MPOA_trigger_rcvd(mesg, mpc); 928 break; 929 case INGRESS_PURGE_RCVD: 930 dprintk_cont("nhrp_purge_rcvd\n"); 931 ingress_purge_rcvd(mesg, mpc); 932 break; 933 case EGRESS_PURGE_RCVD: 934 dprintk_cont("egress_purge_reply_rcvd\n"); 935 egress_purge_rcvd(mesg, mpc); 936 break; 937 case MPS_DEATH: 938 dprintk_cont("mps_death\n"); 939 mps_death(mesg, mpc); 940 break; 941 case CACHE_IMPOS_RCVD: 942 dprintk_cont("cache_impos_rcvd\n"); 943 MPOA_cache_impos_rcvd(mesg, mpc); 944 break; 945 case SET_MPC_CTRL_ADDR: 946 dprintk_cont("set_mpc_ctrl_addr\n"); 947 set_mpc_ctrl_addr_rcvd(mesg, mpc); 948 break; 949 case SET_MPS_MAC_ADDR: 950 dprintk_cont("set_mps_mac_addr\n"); 951 set_mps_mac_addr_rcvd(mesg, mpc); 952 break; 953 case CLEAN_UP_AND_EXIT: 954 dprintk_cont("clean_up_and_exit\n"); 955 clean_up(mesg, mpc, DIE); 956 break; 957 case RELOAD: 958 dprintk_cont("reload\n"); 959 clean_up(mesg, mpc, RELOAD); 960 break; 961 case SET_MPC_PARAMS: 962 dprintk_cont("set_mpc_params\n"); 963 mpc->parameters = mesg->content.params; 964 break; 965 default: 966 dprintk_cont("unknown message %d\n", mesg->type); 967 break; 968 } 969 kfree_skb(skb); 970 971 return 0; 972 } 973 974 /* Remember that this function may not do things that sleep */ 975 int msg_to_mpoad(struct k_message *mesg, struct mpoa_client *mpc) 976 { 977 struct sk_buff *skb; 978 struct sock *sk; 979 980 if (mpc == NULL || !mpc->mpoad_vcc) { 981 pr_info("mesg %d to a non-existent mpoad\n", mesg->type); 982 return -ENXIO; 983 } 984 985 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC); 986 if (skb == NULL) 987 return -ENOMEM; 988 skb_put(skb, sizeof(struct k_message)); 989 skb_copy_to_linear_data(skb, mesg, sizeof(*mesg)); 990 atm_force_charge(mpc->mpoad_vcc, skb->truesize); 991 992 sk = sk_atm(mpc->mpoad_vcc); 993 skb_queue_tail(&sk->sk_receive_queue, skb); 994 sk->sk_data_ready(sk); 995 996 return 0; 997 } 998 999 static int mpoa_event_listener(struct notifier_block *mpoa_notifier, 1000 unsigned long event, void *ptr) 1001 { 1002 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1003 struct mpoa_client *mpc; 1004 struct lec_priv *priv; 1005 1006 if (!net_eq(dev_net(dev), &init_net)) 1007 return NOTIFY_DONE; 1008 1009 if (strncmp(dev->name, "lec", 3)) 1010 return NOTIFY_DONE; /* we are only interested in lec:s */ 1011 1012 switch (event) { 1013 case NETDEV_REGISTER: /* a new lec device was allocated */ 1014 priv = netdev_priv(dev); 1015 if (priv->lane_version < 2) 1016 break; 1017 priv->lane2_ops->associate_indicator = lane2_assoc_ind; 1018 mpc = find_mpc_by_itfnum(priv->itfnum); 1019 if (mpc == NULL) { 1020 dprintk("allocating new mpc for %s\n", dev->name); 1021 mpc = alloc_mpc(); 1022 if (mpc == NULL) { 1023 pr_info("no new mpc"); 1024 break; 1025 } 1026 } 1027 mpc->dev_num = priv->itfnum; 1028 mpc->dev = dev; 1029 dev_hold(dev); 1030 dprintk("(%s) was initialized\n", dev->name); 1031 break; 1032 case NETDEV_UNREGISTER: 1033 /* the lec device was deallocated */ 1034 mpc = find_mpc_by_lec(dev); 1035 if (mpc == NULL) 1036 break; 1037 dprintk("device (%s) was deallocated\n", dev->name); 1038 stop_mpc(mpc); 1039 dev_put(mpc->dev); 1040 mpc->dev = NULL; 1041 break; 1042 case NETDEV_UP: 1043 /* the dev was ifconfig'ed up */ 1044 mpc = find_mpc_by_lec(dev); 1045 if (mpc == NULL) 1046 break; 1047 if (mpc->mpoad_vcc != NULL) 1048 start_mpc(mpc, dev); 1049 break; 1050 case NETDEV_DOWN: 1051 /* the dev was ifconfig'ed down */ 1052 /* this means that the flow of packets from the 1053 * upper layer stops 1054 */ 1055 mpc = find_mpc_by_lec(dev); 1056 if (mpc == NULL) 1057 break; 1058 if (mpc->mpoad_vcc != NULL) 1059 stop_mpc(mpc); 1060 break; 1061 case NETDEV_REBOOT: 1062 case NETDEV_CHANGE: 1063 case NETDEV_CHANGEMTU: 1064 case NETDEV_CHANGEADDR: 1065 case NETDEV_GOING_DOWN: 1066 break; 1067 default: 1068 break; 1069 } 1070 1071 return NOTIFY_DONE; 1072 } 1073 1074 /* 1075 * Functions which are called after a message is received from mpcd. 1076 * Msg is reused on purpose. 1077 */ 1078 1079 1080 static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1081 { 1082 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1083 in_cache_entry *entry; 1084 1085 entry = mpc->in_ops->get(dst_ip, mpc); 1086 if (entry == NULL) { 1087 entry = mpc->in_ops->add_entry(dst_ip, mpc); 1088 entry->entry_state = INGRESS_RESOLVING; 1089 msg->type = SND_MPOA_RES_RQST; 1090 msg->content.in_info = entry->ctrl_info; 1091 msg_to_mpoad(msg, mpc); 1092 entry->reply_wait = ktime_get_seconds(); 1093 mpc->in_ops->put(entry); 1094 return; 1095 } 1096 1097 if (entry->entry_state == INGRESS_INVALID) { 1098 entry->entry_state = INGRESS_RESOLVING; 1099 msg->type = SND_MPOA_RES_RQST; 1100 msg->content.in_info = entry->ctrl_info; 1101 msg_to_mpoad(msg, mpc); 1102 entry->reply_wait = ktime_get_seconds(); 1103 mpc->in_ops->put(entry); 1104 return; 1105 } 1106 1107 pr_info("(%s) entry already in resolving state\n", 1108 (mpc->dev) ? mpc->dev->name : "<unknown>"); 1109 mpc->in_ops->put(entry); 1110 } 1111 1112 /* 1113 * Things get complicated because we have to check if there's an egress 1114 * shortcut with suitable traffic parameters we could use. 1115 */ 1116 static void check_qos_and_open_shortcut(struct k_message *msg, 1117 struct mpoa_client *client, 1118 in_cache_entry *entry) 1119 { 1120 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1121 struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip); 1122 eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client); 1123 1124 if (eg_entry && eg_entry->shortcut) { 1125 if (eg_entry->shortcut->qos.txtp.traffic_class & 1126 msg->qos.txtp.traffic_class & 1127 (qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)) { 1128 if (eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR) 1129 entry->shortcut = eg_entry->shortcut; 1130 else if (eg_entry->shortcut->qos.txtp.max_pcr > 0) 1131 entry->shortcut = eg_entry->shortcut; 1132 } 1133 if (entry->shortcut) { 1134 dprintk("(%s) using egress SVC to reach %pI4\n", 1135 client->dev->name, &dst_ip); 1136 client->eg_ops->put(eg_entry); 1137 return; 1138 } 1139 } 1140 if (eg_entry != NULL) 1141 client->eg_ops->put(eg_entry); 1142 1143 /* No luck in the egress cache we must open an ingress SVC */ 1144 msg->type = OPEN_INGRESS_SVC; 1145 if (qos && 1146 (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class)) { 1147 msg->qos = qos->qos; 1148 pr_info("(%s) trying to get a CBR shortcut\n", 1149 client->dev->name); 1150 } else 1151 memset(&msg->qos, 0, sizeof(struct atm_qos)); 1152 msg_to_mpoad(msg, client); 1153 } 1154 1155 static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1156 { 1157 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1158 in_cache_entry *entry = mpc->in_ops->get(dst_ip, mpc); 1159 1160 dprintk("(%s) ip %pI4\n", 1161 mpc->dev->name, &dst_ip); 1162 ddprintk("(%s) entry = %p", 1163 mpc->dev->name, entry); 1164 if (entry == NULL) { 1165 pr_info("(%s) ARGH, received res. reply for an entry that doesn't exist.\n", 1166 mpc->dev->name); 1167 return; 1168 } 1169 ddprintk_cont(" entry_state = %d ", entry->entry_state); 1170 1171 if (entry->entry_state == INGRESS_RESOLVED) { 1172 pr_info("(%s) RESOLVED entry!\n", mpc->dev->name); 1173 mpc->in_ops->put(entry); 1174 return; 1175 } 1176 1177 entry->ctrl_info = msg->content.in_info; 1178 entry->time = ktime_get_seconds(); 1179 /* Used in refreshing func from now on */ 1180 entry->reply_wait = ktime_get_seconds(); 1181 entry->refresh_time = 0; 1182 ddprintk_cont("entry->shortcut = %p\n", entry->shortcut); 1183 1184 if (entry->entry_state == INGRESS_RESOLVING && 1185 entry->shortcut != NULL) { 1186 entry->entry_state = INGRESS_RESOLVED; 1187 mpc->in_ops->put(entry); 1188 return; /* Shortcut already open... */ 1189 } 1190 1191 if (entry->shortcut != NULL) { 1192 pr_info("(%s) entry->shortcut != NULL, impossible!\n", 1193 mpc->dev->name); 1194 mpc->in_ops->put(entry); 1195 return; 1196 } 1197 1198 check_qos_and_open_shortcut(msg, mpc, entry); 1199 entry->entry_state = INGRESS_RESOLVED; 1200 mpc->in_ops->put(entry); 1201 1202 return; 1203 1204 } 1205 1206 static void ingress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1207 { 1208 __be32 dst_ip = msg->content.in_info.in_dst_ip; 1209 __be32 mask = msg->ip_mask; 1210 in_cache_entry *entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask); 1211 1212 if (entry == NULL) { 1213 pr_info("(%s) purge for a non-existing entry, ip = %pI4\n", 1214 mpc->dev->name, &dst_ip); 1215 return; 1216 } 1217 1218 do { 1219 dprintk("(%s) removing an ingress entry, ip = %pI4\n", 1220 mpc->dev->name, &dst_ip); 1221 write_lock_bh(&mpc->ingress_lock); 1222 mpc->in_ops->remove_entry(entry, mpc); 1223 write_unlock_bh(&mpc->ingress_lock); 1224 mpc->in_ops->put(entry); 1225 entry = mpc->in_ops->get_with_mask(dst_ip, mpc, mask); 1226 } while (entry != NULL); 1227 } 1228 1229 static void egress_purge_rcvd(struct k_message *msg, struct mpoa_client *mpc) 1230 { 1231 __be32 cache_id = msg->content.eg_info.cache_id; 1232 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(cache_id, mpc); 1233 1234 if (entry == NULL) { 1235 dprintk("(%s) purge for a non-existing entry\n", 1236 mpc->dev->name); 1237 return; 1238 } 1239 1240 write_lock_irq(&mpc->egress_lock); 1241 mpc->eg_ops->remove_entry(entry, mpc); 1242 write_unlock_irq(&mpc->egress_lock); 1243 1244 mpc->eg_ops->put(entry); 1245 } 1246 1247 static void purge_egress_shortcut(struct atm_vcc *vcc, eg_cache_entry *entry) 1248 { 1249 struct sock *sk; 1250 struct k_message *purge_msg; 1251 struct sk_buff *skb; 1252 1253 dprintk("entering\n"); 1254 if (vcc == NULL) { 1255 pr_info("vcc == NULL\n"); 1256 return; 1257 } 1258 1259 skb = alloc_skb(sizeof(struct k_message), GFP_ATOMIC); 1260 if (skb == NULL) { 1261 pr_info("out of memory\n"); 1262 return; 1263 } 1264 1265 skb_put(skb, sizeof(struct k_message)); 1266 memset(skb->data, 0, sizeof(struct k_message)); 1267 purge_msg = (struct k_message *)skb->data; 1268 purge_msg->type = DATA_PLANE_PURGE; 1269 if (entry != NULL) 1270 purge_msg->content.eg_info = entry->ctrl_info; 1271 1272 atm_force_charge(vcc, skb->truesize); 1273 1274 sk = sk_atm(vcc); 1275 skb_queue_tail(&sk->sk_receive_queue, skb); 1276 sk->sk_data_ready(sk); 1277 dprintk("exiting\n"); 1278 } 1279 1280 /* 1281 * Our MPS died. Tell our daemon to send NHRP data plane purge to each 1282 * of the egress shortcuts we have. 1283 */ 1284 static void mps_death(struct k_message *msg, struct mpoa_client *mpc) 1285 { 1286 eg_cache_entry *entry; 1287 1288 dprintk("(%s)\n", mpc->dev->name); 1289 1290 if (memcmp(msg->MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN)) { 1291 pr_info("(%s) wrong MPS\n", mpc->dev->name); 1292 return; 1293 } 1294 1295 /* FIXME: This knows too much of the cache structure */ 1296 read_lock_irq(&mpc->egress_lock); 1297 entry = mpc->eg_cache; 1298 while (entry != NULL) { 1299 purge_egress_shortcut(entry->shortcut, entry); 1300 entry = entry->next; 1301 } 1302 read_unlock_irq(&mpc->egress_lock); 1303 1304 mpc->in_ops->destroy_cache(mpc); 1305 mpc->eg_ops->destroy_cache(mpc); 1306 } 1307 1308 static void MPOA_cache_impos_rcvd(struct k_message *msg, 1309 struct mpoa_client *mpc) 1310 { 1311 uint16_t holding_time; 1312 eg_cache_entry *entry = mpc->eg_ops->get_by_cache_id(msg->content.eg_info.cache_id, mpc); 1313 1314 holding_time = msg->content.eg_info.holding_time; 1315 dprintk("(%s) entry = %p, holding_time = %u\n", 1316 mpc->dev->name, entry, holding_time); 1317 if (entry == NULL && holding_time) { 1318 entry = mpc->eg_ops->add_entry(msg, mpc); 1319 mpc->eg_ops->put(entry); 1320 return; 1321 } 1322 if (holding_time) { 1323 mpc->eg_ops->update(entry, holding_time); 1324 return; 1325 } 1326 1327 write_lock_irq(&mpc->egress_lock); 1328 mpc->eg_ops->remove_entry(entry, mpc); 1329 write_unlock_irq(&mpc->egress_lock); 1330 1331 mpc->eg_ops->put(entry); 1332 } 1333 1334 static void set_mpc_ctrl_addr_rcvd(struct k_message *mesg, 1335 struct mpoa_client *mpc) 1336 { 1337 struct lec_priv *priv; 1338 int i, retval ; 1339 1340 uint8_t tlv[4 + 1 + 1 + 1 + ATM_ESA_LEN]; 1341 1342 tlv[0] = 00; tlv[1] = 0xa0; tlv[2] = 0x3e; tlv[3] = 0x2a; /* type */ 1343 tlv[4] = 1 + 1 + ATM_ESA_LEN; /* length */ 1344 tlv[5] = 0x02; /* MPOA client */ 1345 tlv[6] = 0x00; /* number of MPS MAC addresses */ 1346 1347 memcpy(&tlv[7], mesg->MPS_ctrl, ATM_ESA_LEN); /* MPC ctrl ATM addr */ 1348 memcpy(mpc->our_ctrl_addr, mesg->MPS_ctrl, ATM_ESA_LEN); 1349 1350 dprintk("(%s) setting MPC ctrl ATM address to", 1351 mpc->dev ? mpc->dev->name : "<unknown>"); 1352 for (i = 7; i < sizeof(tlv); i++) 1353 dprintk_cont(" %02x", tlv[i]); 1354 dprintk_cont("\n"); 1355 1356 if (mpc->dev) { 1357 priv = netdev_priv(mpc->dev); 1358 retval = priv->lane2_ops->associate_req(mpc->dev, 1359 mpc->dev->dev_addr, 1360 tlv, sizeof(tlv)); 1361 if (retval == 0) 1362 pr_info("(%s) MPOA device type TLV association failed\n", 1363 mpc->dev->name); 1364 retval = priv->lane2_ops->resolve(mpc->dev, NULL, 1, NULL, NULL); 1365 if (retval < 0) 1366 pr_info("(%s) targetless LE_ARP request failed\n", 1367 mpc->dev->name); 1368 } 1369 } 1370 1371 static void set_mps_mac_addr_rcvd(struct k_message *msg, 1372 struct mpoa_client *client) 1373 { 1374 1375 if (client->number_of_mps_macs) 1376 kfree(client->mps_macs); 1377 client->number_of_mps_macs = 0; 1378 client->mps_macs = kmemdup(msg->MPS_ctrl, ETH_ALEN, GFP_KERNEL); 1379 if (client->mps_macs == NULL) { 1380 pr_info("out of memory\n"); 1381 return; 1382 } 1383 client->number_of_mps_macs = 1; 1384 } 1385 1386 /* 1387 * purge egress cache and tell daemon to 'action' (DIE, RELOAD) 1388 */ 1389 static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action) 1390 { 1391 1392 eg_cache_entry *entry; 1393 msg->type = SND_EGRESS_PURGE; 1394 1395 1396 /* FIXME: This knows too much of the cache structure */ 1397 read_lock_irq(&mpc->egress_lock); 1398 entry = mpc->eg_cache; 1399 while (entry != NULL) { 1400 msg->content.eg_info = entry->ctrl_info; 1401 dprintk("cache_id %u\n", entry->ctrl_info.cache_id); 1402 msg_to_mpoad(msg, mpc); 1403 entry = entry->next; 1404 } 1405 read_unlock_irq(&mpc->egress_lock); 1406 1407 msg->type = action; 1408 msg_to_mpoad(msg, mpc); 1409 } 1410 1411 static unsigned long checking_time; 1412 1413 static void mpc_timer_refresh(void) 1414 { 1415 mpc_timer.expires = jiffies + (MPC_P2 * HZ); 1416 checking_time = mpc_timer.expires; 1417 add_timer(&mpc_timer); 1418 } 1419 1420 static void mpc_cache_check(struct timer_list *unused) 1421 { 1422 struct mpoa_client *mpc = mpcs; 1423 static unsigned long previous_resolving_check_time; 1424 static unsigned long previous_refresh_time; 1425 1426 while (mpc != NULL) { 1427 mpc->in_ops->clear_count(mpc); 1428 mpc->eg_ops->clear_expired(mpc); 1429 if (checking_time - previous_resolving_check_time > 1430 mpc->parameters.mpc_p4 * HZ) { 1431 mpc->in_ops->check_resolving(mpc); 1432 previous_resolving_check_time = checking_time; 1433 } 1434 if (checking_time - previous_refresh_time > 1435 mpc->parameters.mpc_p5 * HZ) { 1436 mpc->in_ops->refresh(mpc); 1437 previous_refresh_time = checking_time; 1438 } 1439 mpc = mpc->next; 1440 } 1441 mpc_timer_refresh(); 1442 } 1443 1444 static int atm_mpoa_ioctl(struct socket *sock, unsigned int cmd, 1445 unsigned long arg) 1446 { 1447 int err = 0; 1448 struct atm_vcc *vcc = ATM_SD(sock); 1449 1450 if (cmd != ATMMPC_CTRL && cmd != ATMMPC_DATA) 1451 return -ENOIOCTLCMD; 1452 1453 if (!capable(CAP_NET_ADMIN)) 1454 return -EPERM; 1455 1456 switch (cmd) { 1457 case ATMMPC_CTRL: 1458 err = atm_mpoa_mpoad_attach(vcc, (int)arg); 1459 if (err >= 0) 1460 sock->state = SS_CONNECTED; 1461 break; 1462 case ATMMPC_DATA: 1463 err = atm_mpoa_vcc_attach(vcc, (void __user *)arg); 1464 break; 1465 default: 1466 break; 1467 } 1468 return err; 1469 } 1470 1471 static struct atm_ioctl atm_ioctl_ops = { 1472 .owner = THIS_MODULE, 1473 .ioctl = atm_mpoa_ioctl, 1474 }; 1475 1476 static __init int atm_mpoa_init(void) 1477 { 1478 register_atm_ioctl(&atm_ioctl_ops); 1479 1480 if (mpc_proc_init() != 0) 1481 pr_info("failed to initialize /proc/mpoa\n"); 1482 1483 pr_info("mpc.c: initialized\n"); 1484 1485 return 0; 1486 } 1487 1488 static void __exit atm_mpoa_cleanup(void) 1489 { 1490 struct mpoa_client *mpc, *tmp; 1491 struct atm_mpoa_qos *qos, *nextqos; 1492 struct lec_priv *priv; 1493 1494 mpc_proc_clean(); 1495 1496 del_timer_sync(&mpc_timer); 1497 unregister_netdevice_notifier(&mpoa_notifier); 1498 deregister_atm_ioctl(&atm_ioctl_ops); 1499 1500 mpc = mpcs; 1501 mpcs = NULL; 1502 while (mpc != NULL) { 1503 tmp = mpc->next; 1504 if (mpc->dev != NULL) { 1505 stop_mpc(mpc); 1506 priv = netdev_priv(mpc->dev); 1507 if (priv->lane2_ops != NULL) 1508 priv->lane2_ops->associate_indicator = NULL; 1509 } 1510 ddprintk("about to clear caches\n"); 1511 mpc->in_ops->destroy_cache(mpc); 1512 mpc->eg_ops->destroy_cache(mpc); 1513 ddprintk("caches cleared\n"); 1514 kfree(mpc->mps_macs); 1515 memset(mpc, 0, sizeof(struct mpoa_client)); 1516 ddprintk("about to kfree %p\n", mpc); 1517 kfree(mpc); 1518 ddprintk("next mpc is at %p\n", tmp); 1519 mpc = tmp; 1520 } 1521 1522 qos = qos_head; 1523 qos_head = NULL; 1524 while (qos != NULL) { 1525 nextqos = qos->next; 1526 dprintk("freeing qos entry %p\n", qos); 1527 kfree(qos); 1528 qos = nextqos; 1529 } 1530 } 1531 1532 module_init(atm_mpoa_init); 1533 module_exit(atm_mpoa_cleanup); 1534 1535 MODULE_DESCRIPTION("Multi-Protocol Over ATM (MPOA) driver"); 1536 MODULE_LICENSE("GPL"); 1537