1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Generic HDLC support routines for Linux 4 * Point-to-point protocol support 5 * 6 * Copyright (C) 1999 - 2008 Krzysztof Halasa <khc@pm.waw.pl> 7 */ 8 9 #include <linux/errno.h> 10 #include <linux/hdlc.h> 11 #include <linux/if_arp.h> 12 #include <linux/inetdevice.h> 13 #include <linux/init.h> 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/pkt_sched.h> 17 #include <linux/poll.h> 18 #include <linux/skbuff.h> 19 #include <linux/slab.h> 20 #include <linux/spinlock.h> 21 22 #define DEBUG_CP 0 /* also bytes# to dump */ 23 #define DEBUG_STATE 0 24 #define DEBUG_HARD_HEADER 0 25 26 #define HDLC_ADDR_ALLSTATIONS 0xFF 27 #define HDLC_CTRL_UI 0x03 28 29 #define PID_LCP 0xC021 30 #define PID_IP 0x0021 31 #define PID_IPCP 0x8021 32 #define PID_IPV6 0x0057 33 #define PID_IPV6CP 0x8057 34 35 enum {IDX_LCP = 0, IDX_IPCP, IDX_IPV6CP, IDX_COUNT}; 36 enum {CP_CONF_REQ = 1, CP_CONF_ACK, CP_CONF_NAK, CP_CONF_REJ, CP_TERM_REQ, 37 CP_TERM_ACK, CP_CODE_REJ, LCP_PROTO_REJ, LCP_ECHO_REQ, LCP_ECHO_REPLY, 38 LCP_DISC_REQ, CP_CODES}; 39 #if DEBUG_CP 40 static const char *const code_names[CP_CODES] = { 41 "0", "ConfReq", "ConfAck", "ConfNak", "ConfRej", "TermReq", 42 "TermAck", "CodeRej", "ProtoRej", "EchoReq", "EchoReply", "Discard" 43 }; 44 45 static char debug_buffer[64 + 3 * DEBUG_CP]; 46 #endif 47 48 enum {LCP_OPTION_MRU = 1, LCP_OPTION_ACCM, LCP_OPTION_MAGIC = 5}; 49 50 struct hdlc_header { 51 u8 address; 52 u8 control; 53 __be16 protocol; 54 }; 55 56 struct cp_header { 57 u8 code; 58 u8 id; 59 __be16 len; 60 }; 61 62 struct proto { 63 struct net_device *dev; 64 struct timer_list timer; 65 unsigned long timeout; 66 u16 pid; /* protocol ID */ 67 u8 state; 68 u8 cr_id; /* ID of last Configuration-Request */ 69 u8 restart_counter; 70 }; 71 72 struct ppp { 73 struct proto protos[IDX_COUNT]; 74 spinlock_t lock; 75 unsigned long last_pong; 76 unsigned int req_timeout, cr_retries, term_retries; 77 unsigned int keepalive_interval, keepalive_timeout; 78 u8 seq; /* local sequence number for requests */ 79 u8 echo_id; /* ID of last Echo-Request (LCP) */ 80 }; 81 82 enum {CLOSED = 0, STOPPED, STOPPING, REQ_SENT, ACK_RECV, ACK_SENT, OPENED, 83 STATES, STATE_MASK = 0xF}; 84 enum {START = 0, STOP, TO_GOOD, TO_BAD, RCR_GOOD, RCR_BAD, RCA, RCN, RTR, RTA, 85 RUC, RXJ_GOOD, RXJ_BAD, EVENTS}; 86 enum {INV = 0x10, IRC = 0x20, ZRC = 0x40, SCR = 0x80, SCA = 0x100, 87 SCN = 0x200, STR = 0x400, STA = 0x800, SCJ = 0x1000}; 88 89 #if DEBUG_STATE 90 static const char *const state_names[STATES] = { 91 "Closed", "Stopped", "Stopping", "ReqSent", "AckRecv", "AckSent", 92 "Opened" 93 }; 94 95 static const char *const event_names[EVENTS] = { 96 "Start", "Stop", "TO+", "TO-", "RCR+", "RCR-", "RCA", "RCN", 97 "RTR", "RTA", "RUC", "RXJ+", "RXJ-" 98 }; 99 #endif 100 101 static struct sk_buff_head tx_queue; /* used when holding the spin lock */ 102 103 static int ppp_ioctl(struct net_device *dev, struct if_settings *ifs); 104 105 static inline struct ppp *get_ppp(struct net_device *dev) 106 { 107 return (struct ppp *)dev_to_hdlc(dev)->state; 108 } 109 110 static inline struct proto *get_proto(struct net_device *dev, u16 pid) 111 { 112 struct ppp *ppp = get_ppp(dev); 113 114 switch (pid) { 115 case PID_LCP: 116 return &ppp->protos[IDX_LCP]; 117 case PID_IPCP: 118 return &ppp->protos[IDX_IPCP]; 119 case PID_IPV6CP: 120 return &ppp->protos[IDX_IPV6CP]; 121 default: 122 return NULL; 123 } 124 } 125 126 static inline const char *proto_name(u16 pid) 127 { 128 switch (pid) { 129 case PID_LCP: 130 return "LCP"; 131 case PID_IPCP: 132 return "IPCP"; 133 case PID_IPV6CP: 134 return "IPV6CP"; 135 default: 136 return NULL; 137 } 138 } 139 140 static __be16 ppp_type_trans(struct sk_buff *skb, struct net_device *dev) 141 { 142 struct hdlc_header *data = (struct hdlc_header *)skb->data; 143 144 if (skb->len < sizeof(struct hdlc_header)) 145 return htons(ETH_P_HDLC); 146 if (data->address != HDLC_ADDR_ALLSTATIONS || 147 data->control != HDLC_CTRL_UI) 148 return htons(ETH_P_HDLC); 149 150 switch (data->protocol) { 151 case cpu_to_be16(PID_IP): 152 skb_pull(skb, sizeof(struct hdlc_header)); 153 return htons(ETH_P_IP); 154 155 case cpu_to_be16(PID_IPV6): 156 skb_pull(skb, sizeof(struct hdlc_header)); 157 return htons(ETH_P_IPV6); 158 159 default: 160 return htons(ETH_P_HDLC); 161 } 162 } 163 164 static int ppp_hard_header(struct sk_buff *skb, struct net_device *dev, 165 u16 type, const void *daddr, const void *saddr, 166 unsigned int len) 167 { 168 struct hdlc_header *data; 169 #if DEBUG_HARD_HEADER 170 printk(KERN_DEBUG "%s: ppp_hard_header() called\n", dev->name); 171 #endif 172 173 skb_push(skb, sizeof(struct hdlc_header)); 174 data = (struct hdlc_header *)skb->data; 175 176 data->address = HDLC_ADDR_ALLSTATIONS; 177 data->control = HDLC_CTRL_UI; 178 switch (type) { 179 case ETH_P_IP: 180 data->protocol = htons(PID_IP); 181 break; 182 case ETH_P_IPV6: 183 data->protocol = htons(PID_IPV6); 184 break; 185 case PID_LCP: 186 case PID_IPCP: 187 case PID_IPV6CP: 188 data->protocol = htons(type); 189 break; 190 default: /* unknown protocol */ 191 data->protocol = 0; 192 } 193 return sizeof(struct hdlc_header); 194 } 195 196 static void ppp_tx_flush(void) 197 { 198 struct sk_buff *skb; 199 200 while ((skb = skb_dequeue(&tx_queue)) != NULL) 201 dev_queue_xmit(skb); 202 } 203 204 static void ppp_tx_cp(struct net_device *dev, u16 pid, u8 code, 205 u8 id, unsigned int len, const void *data) 206 { 207 struct sk_buff *skb; 208 struct cp_header *cp; 209 unsigned int magic_len = 0; 210 static u32 magic; 211 212 #if DEBUG_CP 213 int i; 214 char *ptr; 215 #endif 216 217 if (pid == PID_LCP && (code == LCP_ECHO_REQ || code == LCP_ECHO_REPLY)) 218 magic_len = sizeof(magic); 219 220 skb = dev_alloc_skb(sizeof(struct hdlc_header) + 221 sizeof(struct cp_header) + magic_len + len); 222 if (!skb) 223 return; 224 225 skb_reserve(skb, sizeof(struct hdlc_header)); 226 227 cp = skb_put(skb, sizeof(struct cp_header)); 228 cp->code = code; 229 cp->id = id; 230 cp->len = htons(sizeof(struct cp_header) + magic_len + len); 231 232 if (magic_len) 233 skb_put_data(skb, &magic, magic_len); 234 if (len) 235 skb_put_data(skb, data, len); 236 237 #if DEBUG_CP 238 BUG_ON(code >= CP_CODES); 239 ptr = debug_buffer; 240 *ptr = '\x0'; 241 for (i = 0; i < min_t(unsigned int, magic_len + len, DEBUG_CP); i++) { 242 sprintf(ptr, " %02X", skb->data[sizeof(struct cp_header) + i]); 243 ptr += strlen(ptr); 244 } 245 printk(KERN_DEBUG "%s: TX %s [%s id 0x%X]%s\n", dev->name, 246 proto_name(pid), code_names[code], id, debug_buffer); 247 #endif 248 249 ppp_hard_header(skb, dev, pid, NULL, NULL, 0); 250 251 skb->priority = TC_PRIO_CONTROL; 252 skb->dev = dev; 253 skb->protocol = htons(ETH_P_HDLC); 254 skb_reset_network_header(skb); 255 skb_queue_tail(&tx_queue, skb); 256 } 257 258 /* State transition table (compare STD-51) 259 Events Actions 260 TO+ = Timeout with counter > 0 irc = Initialize-Restart-Count 261 TO- = Timeout with counter expired zrc = Zero-Restart-Count 262 263 RCR+ = Receive-Configure-Request (Good) scr = Send-Configure-Request 264 RCR- = Receive-Configure-Request (Bad) 265 RCA = Receive-Configure-Ack sca = Send-Configure-Ack 266 RCN = Receive-Configure-Nak/Rej scn = Send-Configure-Nak/Rej 267 268 RTR = Receive-Terminate-Request str = Send-Terminate-Request 269 RTA = Receive-Terminate-Ack sta = Send-Terminate-Ack 270 271 RUC = Receive-Unknown-Code scj = Send-Code-Reject 272 RXJ+ = Receive-Code-Reject (permitted) 273 or Receive-Protocol-Reject 274 RXJ- = Receive-Code-Reject (catastrophic) 275 or Receive-Protocol-Reject 276 */ 277 static int cp_table[EVENTS][STATES] = { 278 /* CLOSED STOPPED STOPPING REQ_SENT ACK_RECV ACK_SENT OPENED 279 0 1 2 3 4 5 6 */ 280 {IRC|SCR|3, INV , INV , INV , INV , INV , INV }, /* START */ 281 { INV , 0 , 0 , 0 , 0 , 0 , 0 }, /* STOP */ 282 { INV , INV ,STR|2, SCR|3 ,SCR|3, SCR|5 , INV }, /* TO+ */ 283 { INV , INV , 1 , 1 , 1 , 1 , INV }, /* TO- */ 284 { STA|0 ,IRC|SCR|SCA|5, 2 , SCA|5 ,SCA|6, SCA|5 ,SCR|SCA|5}, /* RCR+ */ 285 { STA|0 ,IRC|SCR|SCN|3, 2 , SCN|3 ,SCN|4, SCN|3 ,SCR|SCN|3}, /* RCR- */ 286 { STA|0 , STA|1 , 2 , IRC|4 ,SCR|3, 6 , SCR|3 }, /* RCA */ 287 { STA|0 , STA|1 , 2 ,IRC|SCR|3,SCR|3,IRC|SCR|5, SCR|3 }, /* RCN */ 288 { STA|0 , STA|1 ,STA|2, STA|3 ,STA|3, STA|3 ,ZRC|STA|2}, /* RTR */ 289 { 0 , 1 , 1 , 3 , 3 , 5 , SCR|3 }, /* RTA */ 290 { SCJ|0 , SCJ|1 ,SCJ|2, SCJ|3 ,SCJ|4, SCJ|5 , SCJ|6 }, /* RUC */ 291 { 0 , 1 , 2 , 3 , 3 , 5 , 6 }, /* RXJ+ */ 292 { 0 , 1 , 1 , 1 , 1 , 1 ,IRC|STR|2}, /* RXJ- */ 293 }; 294 295 /* SCA: RCR+ must supply id, len and data 296 SCN: RCR- must supply code, id, len and data 297 STA: RTR must supply id 298 SCJ: RUC must supply CP packet len and data */ 299 static void ppp_cp_event(struct net_device *dev, u16 pid, u16 event, u8 code, 300 u8 id, unsigned int len, const void *data) 301 { 302 int old_state, action; 303 struct ppp *ppp = get_ppp(dev); 304 struct proto *proto = get_proto(dev, pid); 305 306 old_state = proto->state; 307 BUG_ON(old_state >= STATES); 308 BUG_ON(event >= EVENTS); 309 310 #if DEBUG_STATE 311 printk(KERN_DEBUG "%s: %s ppp_cp_event(%s) %s ...\n", dev->name, 312 proto_name(pid), event_names[event], state_names[proto->state]); 313 #endif 314 315 action = cp_table[event][old_state]; 316 317 proto->state = action & STATE_MASK; 318 if (action & (SCR | STR)) /* set Configure-Req/Terminate-Req timer */ 319 mod_timer(&proto->timer, proto->timeout = 320 jiffies + ppp->req_timeout * HZ); 321 if (action & ZRC) 322 proto->restart_counter = 0; 323 if (action & IRC) 324 proto->restart_counter = (proto->state == STOPPING) ? 325 ppp->term_retries : ppp->cr_retries; 326 327 if (action & SCR) /* send Configure-Request */ 328 ppp_tx_cp(dev, pid, CP_CONF_REQ, proto->cr_id = ++ppp->seq, 329 0, NULL); 330 if (action & SCA) /* send Configure-Ack */ 331 ppp_tx_cp(dev, pid, CP_CONF_ACK, id, len, data); 332 if (action & SCN) /* send Configure-Nak/Reject */ 333 ppp_tx_cp(dev, pid, code, id, len, data); 334 if (action & STR) /* send Terminate-Request */ 335 ppp_tx_cp(dev, pid, CP_TERM_REQ, ++ppp->seq, 0, NULL); 336 if (action & STA) /* send Terminate-Ack */ 337 ppp_tx_cp(dev, pid, CP_TERM_ACK, id, 0, NULL); 338 if (action & SCJ) /* send Code-Reject */ 339 ppp_tx_cp(dev, pid, CP_CODE_REJ, ++ppp->seq, len, data); 340 341 if (old_state != OPENED && proto->state == OPENED) { 342 netdev_info(dev, "%s up\n", proto_name(pid)); 343 if (pid == PID_LCP) { 344 netif_dormant_off(dev); 345 ppp_cp_event(dev, PID_IPCP, START, 0, 0, 0, NULL); 346 ppp_cp_event(dev, PID_IPV6CP, START, 0, 0, 0, NULL); 347 ppp->last_pong = jiffies; 348 mod_timer(&proto->timer, proto->timeout = 349 jiffies + ppp->keepalive_interval * HZ); 350 } 351 } 352 if (old_state == OPENED && proto->state != OPENED) { 353 netdev_info(dev, "%s down\n", proto_name(pid)); 354 if (pid == PID_LCP) { 355 netif_dormant_on(dev); 356 ppp_cp_event(dev, PID_IPCP, STOP, 0, 0, 0, NULL); 357 ppp_cp_event(dev, PID_IPV6CP, STOP, 0, 0, 0, NULL); 358 } 359 } 360 if (old_state != CLOSED && proto->state == CLOSED) 361 del_timer(&proto->timer); 362 363 #if DEBUG_STATE 364 printk(KERN_DEBUG "%s: %s ppp_cp_event(%s) ... %s\n", dev->name, 365 proto_name(pid), event_names[event], state_names[proto->state]); 366 #endif 367 } 368 369 static void ppp_cp_parse_cr(struct net_device *dev, u16 pid, u8 id, 370 unsigned int req_len, const u8 *data) 371 { 372 static u8 const valid_accm[6] = { LCP_OPTION_ACCM, 6, 0, 0, 0, 0 }; 373 const u8 *opt; 374 u8 *out; 375 unsigned int len = req_len, nak_len = 0, rej_len = 0; 376 377 out = kmalloc(len, GFP_ATOMIC); 378 if (!out) { 379 dev->stats.rx_dropped++; 380 return; /* out of memory, ignore CR packet */ 381 } 382 383 for (opt = data; len; len -= opt[1], opt += opt[1]) { 384 if (len < 2 || opt[1] < 2 || len < opt[1]) 385 goto err_out; 386 387 if (pid == PID_LCP) 388 switch (opt[0]) { 389 case LCP_OPTION_MRU: 390 continue; /* MRU always OK and > 1500 bytes? */ 391 392 case LCP_OPTION_ACCM: /* async control character map */ 393 if (opt[1] < sizeof(valid_accm)) 394 goto err_out; 395 if (!memcmp(opt, valid_accm, 396 sizeof(valid_accm))) 397 continue; 398 if (!rej_len) { /* NAK it */ 399 memcpy(out + nak_len, valid_accm, 400 sizeof(valid_accm)); 401 nak_len += sizeof(valid_accm); 402 continue; 403 } 404 break; 405 case LCP_OPTION_MAGIC: 406 if (len < 6) 407 goto err_out; 408 if (opt[1] != 6 || (!opt[2] && !opt[3] && 409 !opt[4] && !opt[5])) 410 break; /* reject invalid magic number */ 411 continue; 412 } 413 /* reject this option */ 414 memcpy(out + rej_len, opt, opt[1]); 415 rej_len += opt[1]; 416 } 417 418 if (rej_len) 419 ppp_cp_event(dev, pid, RCR_BAD, CP_CONF_REJ, id, rej_len, out); 420 else if (nak_len) 421 ppp_cp_event(dev, pid, RCR_BAD, CP_CONF_NAK, id, nak_len, out); 422 else 423 ppp_cp_event(dev, pid, RCR_GOOD, CP_CONF_ACK, id, req_len, data); 424 425 kfree(out); 426 return; 427 428 err_out: 429 dev->stats.rx_errors++; 430 kfree(out); 431 } 432 433 static int ppp_rx(struct sk_buff *skb) 434 { 435 struct hdlc_header *hdr = (struct hdlc_header *)skb->data; 436 struct net_device *dev = skb->dev; 437 struct ppp *ppp = get_ppp(dev); 438 struct proto *proto; 439 struct cp_header *cp; 440 unsigned long flags; 441 unsigned int len; 442 u16 pid; 443 #if DEBUG_CP 444 int i; 445 char *ptr; 446 #endif 447 448 spin_lock_irqsave(&ppp->lock, flags); 449 /* Check HDLC header */ 450 if (skb->len < sizeof(struct hdlc_header)) 451 goto rx_error; 452 cp = skb_pull(skb, sizeof(struct hdlc_header)); 453 if (hdr->address != HDLC_ADDR_ALLSTATIONS || 454 hdr->control != HDLC_CTRL_UI) 455 goto rx_error; 456 457 pid = ntohs(hdr->protocol); 458 proto = get_proto(dev, pid); 459 if (!proto) { 460 if (ppp->protos[IDX_LCP].state == OPENED) 461 ppp_tx_cp(dev, PID_LCP, LCP_PROTO_REJ, 462 ++ppp->seq, skb->len + 2, &hdr->protocol); 463 goto rx_error; 464 } 465 466 len = ntohs(cp->len); 467 if (len < sizeof(struct cp_header) /* no complete CP header? */ || 468 skb->len < len /* truncated packet? */) 469 goto rx_error; 470 skb_pull(skb, sizeof(struct cp_header)); 471 len -= sizeof(struct cp_header); 472 473 /* HDLC and CP headers stripped from skb */ 474 #if DEBUG_CP 475 if (cp->code < CP_CODES) 476 sprintf(debug_buffer, "[%s id 0x%X]", code_names[cp->code], 477 cp->id); 478 else 479 sprintf(debug_buffer, "[code %u id 0x%X]", cp->code, cp->id); 480 ptr = debug_buffer + strlen(debug_buffer); 481 for (i = 0; i < min_t(unsigned int, len, DEBUG_CP); i++) { 482 sprintf(ptr, " %02X", skb->data[i]); 483 ptr += strlen(ptr); 484 } 485 printk(KERN_DEBUG "%s: RX %s %s\n", dev->name, proto_name(pid), 486 debug_buffer); 487 #endif 488 489 /* LCP only */ 490 if (pid == PID_LCP) 491 switch (cp->code) { 492 case LCP_PROTO_REJ: 493 pid = ntohs(*(__be16 *)skb->data); 494 if (pid == PID_LCP || pid == PID_IPCP || 495 pid == PID_IPV6CP) 496 ppp_cp_event(dev, pid, RXJ_BAD, 0, 0, 497 0, NULL); 498 goto out; 499 500 case LCP_ECHO_REQ: /* send Echo-Reply */ 501 if (len >= 4 && proto->state == OPENED) 502 ppp_tx_cp(dev, PID_LCP, LCP_ECHO_REPLY, 503 cp->id, len - 4, skb->data + 4); 504 goto out; 505 506 case LCP_ECHO_REPLY: 507 if (cp->id == ppp->echo_id) 508 ppp->last_pong = jiffies; 509 goto out; 510 511 case LCP_DISC_REQ: /* discard */ 512 goto out; 513 } 514 515 /* LCP, IPCP and IPV6CP */ 516 switch (cp->code) { 517 case CP_CONF_REQ: 518 ppp_cp_parse_cr(dev, pid, cp->id, len, skb->data); 519 break; 520 521 case CP_CONF_ACK: 522 if (cp->id == proto->cr_id) 523 ppp_cp_event(dev, pid, RCA, 0, 0, 0, NULL); 524 break; 525 526 case CP_CONF_REJ: 527 case CP_CONF_NAK: 528 if (cp->id == proto->cr_id) 529 ppp_cp_event(dev, pid, RCN, 0, 0, 0, NULL); 530 break; 531 532 case CP_TERM_REQ: 533 ppp_cp_event(dev, pid, RTR, 0, cp->id, 0, NULL); 534 break; 535 536 case CP_TERM_ACK: 537 ppp_cp_event(dev, pid, RTA, 0, 0, 0, NULL); 538 break; 539 540 case CP_CODE_REJ: 541 ppp_cp_event(dev, pid, RXJ_BAD, 0, 0, 0, NULL); 542 break; 543 544 default: 545 len += sizeof(struct cp_header); 546 if (len > dev->mtu) 547 len = dev->mtu; 548 ppp_cp_event(dev, pid, RUC, 0, 0, len, cp); 549 break; 550 } 551 goto out; 552 553 rx_error: 554 dev->stats.rx_errors++; 555 out: 556 spin_unlock_irqrestore(&ppp->lock, flags); 557 dev_kfree_skb_any(skb); 558 ppp_tx_flush(); 559 return NET_RX_DROP; 560 } 561 562 static void ppp_timer(struct timer_list *t) 563 { 564 struct proto *proto = from_timer(proto, t, timer); 565 struct ppp *ppp = get_ppp(proto->dev); 566 unsigned long flags; 567 568 spin_lock_irqsave(&ppp->lock, flags); 569 /* mod_timer could be called after we entered this function but 570 * before we got the lock. 571 */ 572 if (timer_pending(&proto->timer)) { 573 spin_unlock_irqrestore(&ppp->lock, flags); 574 return; 575 } 576 switch (proto->state) { 577 case STOPPING: 578 case REQ_SENT: 579 case ACK_RECV: 580 case ACK_SENT: 581 if (proto->restart_counter) { 582 ppp_cp_event(proto->dev, proto->pid, TO_GOOD, 0, 0, 583 0, NULL); 584 proto->restart_counter--; 585 } else if (netif_carrier_ok(proto->dev)) 586 ppp_cp_event(proto->dev, proto->pid, TO_GOOD, 0, 0, 587 0, NULL); 588 else 589 ppp_cp_event(proto->dev, proto->pid, TO_BAD, 0, 0, 590 0, NULL); 591 break; 592 593 case OPENED: 594 if (proto->pid != PID_LCP) 595 break; 596 if (time_after(jiffies, ppp->last_pong + 597 ppp->keepalive_timeout * HZ)) { 598 netdev_info(proto->dev, "Link down\n"); 599 ppp_cp_event(proto->dev, PID_LCP, STOP, 0, 0, 0, NULL); 600 ppp_cp_event(proto->dev, PID_LCP, START, 0, 0, 0, NULL); 601 } else { /* send keep-alive packet */ 602 ppp->echo_id = ++ppp->seq; 603 ppp_tx_cp(proto->dev, PID_LCP, LCP_ECHO_REQ, 604 ppp->echo_id, 0, NULL); 605 proto->timer.expires = jiffies + 606 ppp->keepalive_interval * HZ; 607 add_timer(&proto->timer); 608 } 609 break; 610 } 611 spin_unlock_irqrestore(&ppp->lock, flags); 612 ppp_tx_flush(); 613 } 614 615 static void ppp_start(struct net_device *dev) 616 { 617 struct ppp *ppp = get_ppp(dev); 618 int i; 619 620 for (i = 0; i < IDX_COUNT; i++) { 621 struct proto *proto = &ppp->protos[i]; 622 623 proto->dev = dev; 624 timer_setup(&proto->timer, ppp_timer, 0); 625 proto->state = CLOSED; 626 } 627 ppp->protos[IDX_LCP].pid = PID_LCP; 628 ppp->protos[IDX_IPCP].pid = PID_IPCP; 629 ppp->protos[IDX_IPV6CP].pid = PID_IPV6CP; 630 631 ppp_cp_event(dev, PID_LCP, START, 0, 0, 0, NULL); 632 } 633 634 static void ppp_stop(struct net_device *dev) 635 { 636 ppp_cp_event(dev, PID_LCP, STOP, 0, 0, 0, NULL); 637 } 638 639 static void ppp_close(struct net_device *dev) 640 { 641 ppp_tx_flush(); 642 } 643 644 static struct hdlc_proto proto = { 645 .start = ppp_start, 646 .stop = ppp_stop, 647 .close = ppp_close, 648 .type_trans = ppp_type_trans, 649 .ioctl = ppp_ioctl, 650 .netif_rx = ppp_rx, 651 .module = THIS_MODULE, 652 }; 653 654 static const struct header_ops ppp_header_ops = { 655 .create = ppp_hard_header, 656 }; 657 658 static int ppp_ioctl(struct net_device *dev, struct if_settings *ifs) 659 { 660 hdlc_device *hdlc = dev_to_hdlc(dev); 661 struct ppp *ppp; 662 int result; 663 664 switch (ifs->type) { 665 case IF_GET_PROTO: 666 if (dev_to_hdlc(dev)->proto != &proto) 667 return -EINVAL; 668 ifs->type = IF_PROTO_PPP; 669 return 0; /* return protocol only, no settable parameters */ 670 671 case IF_PROTO_PPP: 672 if (!capable(CAP_NET_ADMIN)) 673 return -EPERM; 674 675 if (dev->flags & IFF_UP) 676 return -EBUSY; 677 678 /* no settable parameters */ 679 680 result = hdlc->attach(dev, ENCODING_NRZ, 681 PARITY_CRC16_PR1_CCITT); 682 if (result) 683 return result; 684 685 result = attach_hdlc_protocol(dev, &proto, sizeof(struct ppp)); 686 if (result) 687 return result; 688 689 ppp = get_ppp(dev); 690 spin_lock_init(&ppp->lock); 691 ppp->req_timeout = 2; 692 ppp->cr_retries = 10; 693 ppp->term_retries = 2; 694 ppp->keepalive_interval = 10; 695 ppp->keepalive_timeout = 60; 696 697 dev->hard_header_len = sizeof(struct hdlc_header); 698 dev->header_ops = &ppp_header_ops; 699 dev->type = ARPHRD_PPP; 700 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev); 701 netif_dormant_on(dev); 702 return 0; 703 } 704 705 return -EINVAL; 706 } 707 708 static int __init hdlc_ppp_init(void) 709 { 710 skb_queue_head_init(&tx_queue); 711 register_hdlc_protocol(&proto); 712 return 0; 713 } 714 715 static void __exit hdlc_ppp_exit(void) 716 { 717 unregister_hdlc_protocol(&proto); 718 } 719 720 module_init(hdlc_ppp_init); 721 module_exit(hdlc_ppp_exit); 722 723 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); 724 MODULE_DESCRIPTION("PPP protocol support for generic HDLC"); 725 MODULE_LICENSE("GPL v2"); 726