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 static char debug_buffer[64 + 3 * DEBUG_CP]; 45 #endif 46 47 enum {LCP_OPTION_MRU = 1, LCP_OPTION_ACCM, LCP_OPTION_MAGIC = 5}; 48 49 struct hdlc_header { 50 u8 address; 51 u8 control; 52 __be16 protocol; 53 }; 54 55 struct cp_header { 56 u8 code; 57 u8 id; 58 __be16 len; 59 }; 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 static const char *const event_names[EVENTS] = { 95 "Start", "Stop", "TO+", "TO-", "RCR+", "RCR-", "RCA", "RCN", 96 "RTR", "RTA", "RUC", "RXJ+", "RXJ-" 97 }; 98 #endif 99 100 static struct sk_buff_head tx_queue; /* used when holding the spin lock */ 101 102 static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr); 103 104 static inline struct ppp* get_ppp(struct net_device *dev) 105 { 106 return (struct ppp *)dev_to_hdlc(dev)->state; 107 } 108 109 static inline struct proto* get_proto(struct net_device *dev, u16 pid) 110 { 111 struct ppp *ppp = get_ppp(dev); 112 113 switch (pid) { 114 case PID_LCP: 115 return &ppp->protos[IDX_LCP]; 116 case PID_IPCP: 117 return &ppp->protos[IDX_IPCP]; 118 case PID_IPV6CP: 119 return &ppp->protos[IDX_IPV6CP]; 120 default: 121 return NULL; 122 } 123 } 124 125 static inline const char* proto_name(u16 pid) 126 { 127 switch (pid) { 128 case PID_LCP: 129 return "LCP"; 130 case PID_IPCP: 131 return "IPCP"; 132 case PID_IPV6CP: 133 return "IPV6CP"; 134 default: 135 return NULL; 136 } 137 } 138 139 static __be16 ppp_type_trans(struct sk_buff *skb, struct net_device *dev) 140 { 141 struct hdlc_header *data = (struct hdlc_header*)skb->data; 142 143 if (skb->len < sizeof(struct hdlc_header)) 144 return htons(ETH_P_HDLC); 145 if (data->address != HDLC_ADDR_ALLSTATIONS || 146 data->control != HDLC_CTRL_UI) 147 return htons(ETH_P_HDLC); 148 149 switch (data->protocol) { 150 case cpu_to_be16(PID_IP): 151 skb_pull(skb, sizeof(struct hdlc_header)); 152 return htons(ETH_P_IP); 153 154 case cpu_to_be16(PID_IPV6): 155 skb_pull(skb, sizeof(struct hdlc_header)); 156 return htons(ETH_P_IPV6); 157 158 default: 159 return htons(ETH_P_HDLC); 160 } 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 } 195 196 197 static void ppp_tx_flush(void) 198 { 199 struct sk_buff *skb; 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 netdev_warn(dev, "out of memory in ppp_tx_cp()\n"); 224 return; 225 } 226 skb_reserve(skb, sizeof(struct hdlc_header)); 227 228 cp = skb_put(skb, sizeof(struct cp_header)); 229 cp->code = code; 230 cp->id = id; 231 cp->len = htons(sizeof(struct cp_header) + magic_len + len); 232 233 if (magic_len) 234 skb_put_data(skb, &magic, magic_len); 235 if (len) 236 skb_put_data(skb, data, len); 237 238 #if DEBUG_CP 239 BUG_ON(code >= CP_CODES); 240 ptr = debug_buffer; 241 *ptr = '\x0'; 242 for (i = 0; i < min_t(unsigned int, magic_len + len, DEBUG_CP); i++) { 243 sprintf(ptr, " %02X", skb->data[sizeof(struct cp_header) + i]); 244 ptr += strlen(ptr); 245 } 246 printk(KERN_DEBUG "%s: TX %s [%s id 0x%X]%s\n", dev->name, 247 proto_name(pid), code_names[code], id, debug_buffer); 248 #endif 249 250 ppp_hard_header(skb, dev, pid, NULL, NULL, 0); 251 252 skb->priority = TC_PRIO_CONTROL; 253 skb->dev = dev; 254 skb_reset_network_header(skb); 255 skb_queue_tail(&tx_queue, skb); 256 } 257 258 259 /* State transition table (compare STD-51) 260 Events Actions 261 TO+ = Timeout with counter > 0 irc = Initialize-Restart-Count 262 TO- = Timeout with counter expired zrc = Zero-Restart-Count 263 264 RCR+ = Receive-Configure-Request (Good) scr = Send-Configure-Request 265 RCR- = Receive-Configure-Request (Bad) 266 RCA = Receive-Configure-Ack sca = Send-Configure-Ack 267 RCN = Receive-Configure-Nak/Rej scn = Send-Configure-Nak/Rej 268 269 RTR = Receive-Terminate-Request str = Send-Terminate-Request 270 RTA = Receive-Terminate-Ack sta = Send-Terminate-Ack 271 272 RUC = Receive-Unknown-Code scj = Send-Code-Reject 273 RXJ+ = Receive-Code-Reject (permitted) 274 or Receive-Protocol-Reject 275 RXJ- = Receive-Code-Reject (catastrophic) 276 or Receive-Protocol-Reject 277 */ 278 static int cp_table[EVENTS][STATES] = { 279 /* CLOSED STOPPED STOPPING REQ_SENT ACK_RECV ACK_SENT OPENED 280 0 1 2 3 4 5 6 */ 281 {IRC|SCR|3, INV , INV , INV , INV , INV , INV }, /* START */ 282 { INV , 0 , 0 , 0 , 0 , 0 , 0 }, /* STOP */ 283 { INV , INV ,STR|2, SCR|3 ,SCR|3, SCR|5 , INV }, /* TO+ */ 284 { INV , INV , 1 , 1 , 1 , 1 , INV }, /* TO- */ 285 { STA|0 ,IRC|SCR|SCA|5, 2 , SCA|5 ,SCA|6, SCA|5 ,SCR|SCA|5}, /* RCR+ */ 286 { STA|0 ,IRC|SCR|SCN|3, 2 , SCN|3 ,SCN|4, SCN|3 ,SCR|SCN|3}, /* RCR- */ 287 { STA|0 , STA|1 , 2 , IRC|4 ,SCR|3, 6 , SCR|3 }, /* RCA */ 288 { STA|0 , STA|1 , 2 ,IRC|SCR|3,SCR|3,IRC|SCR|5, SCR|3 }, /* RCN */ 289 { STA|0 , STA|1 ,STA|2, STA|3 ,STA|3, STA|3 ,ZRC|STA|2}, /* RTR */ 290 { 0 , 1 , 1 , 3 , 3 , 5 , SCR|3 }, /* RTA */ 291 { SCJ|0 , SCJ|1 ,SCJ|2, SCJ|3 ,SCJ|4, SCJ|5 , SCJ|6 }, /* RUC */ 292 { 0 , 1 , 2 , 3 , 3 , 5 , 6 }, /* RXJ+ */ 293 { 0 , 1 , 1 , 1 , 1 , 1 ,IRC|STR|2}, /* RXJ- */ 294 }; 295 296 297 /* SCA: RCR+ must supply id, len and data 298 SCN: RCR- must supply code, id, len and data 299 STA: RTR must supply id 300 SCJ: RUC must supply CP packet len and data */ 301 static void ppp_cp_event(struct net_device *dev, u16 pid, u16 event, u8 code, 302 u8 id, unsigned int len, const void *data) 303 { 304 int old_state, action; 305 struct ppp *ppp = get_ppp(dev); 306 struct proto *proto = get_proto(dev, pid); 307 308 old_state = proto->state; 309 BUG_ON(old_state >= STATES); 310 BUG_ON(event >= EVENTS); 311 312 #if DEBUG_STATE 313 printk(KERN_DEBUG "%s: %s ppp_cp_event(%s) %s ...\n", dev->name, 314 proto_name(pid), event_names[event], state_names[proto->state]); 315 #endif 316 317 action = cp_table[event][old_state]; 318 319 proto->state = action & STATE_MASK; 320 if (action & (SCR | STR)) /* set Configure-Req/Terminate-Req timer */ 321 mod_timer(&proto->timer, proto->timeout = 322 jiffies + ppp->req_timeout * HZ); 323 if (action & ZRC) 324 proto->restart_counter = 0; 325 if (action & IRC) 326 proto->restart_counter = (proto->state == STOPPING) ? 327 ppp->term_retries : ppp->cr_retries; 328 329 if (action & SCR) /* send Configure-Request */ 330 ppp_tx_cp(dev, pid, CP_CONF_REQ, proto->cr_id = ++ppp->seq, 331 0, NULL); 332 if (action & SCA) /* send Configure-Ack */ 333 ppp_tx_cp(dev, pid, CP_CONF_ACK, id, len, data); 334 if (action & SCN) /* send Configure-Nak/Reject */ 335 ppp_tx_cp(dev, pid, code, id, len, data); 336 if (action & STR) /* send Terminate-Request */ 337 ppp_tx_cp(dev, pid, CP_TERM_REQ, ++ppp->seq, 0, NULL); 338 if (action & STA) /* send Terminate-Ack */ 339 ppp_tx_cp(dev, pid, CP_TERM_ACK, id, 0, NULL); 340 if (action & SCJ) /* send Code-Reject */ 341 ppp_tx_cp(dev, pid, CP_CODE_REJ, ++ppp->seq, len, data); 342 343 if (old_state != OPENED && proto->state == OPENED) { 344 netdev_info(dev, "%s up\n", proto_name(pid)); 345 if (pid == PID_LCP) { 346 netif_dormant_off(dev); 347 ppp_cp_event(dev, PID_IPCP, START, 0, 0, 0, NULL); 348 ppp_cp_event(dev, PID_IPV6CP, START, 0, 0, 0, NULL); 349 ppp->last_pong = jiffies; 350 mod_timer(&proto->timer, proto->timeout = 351 jiffies + ppp->keepalive_interval * HZ); 352 } 353 } 354 if (old_state == OPENED && proto->state != OPENED) { 355 netdev_info(dev, "%s down\n", proto_name(pid)); 356 if (pid == PID_LCP) { 357 netif_dormant_on(dev); 358 ppp_cp_event(dev, PID_IPCP, STOP, 0, 0, 0, NULL); 359 ppp_cp_event(dev, PID_IPV6CP, STOP, 0, 0, 0, NULL); 360 } 361 } 362 if (old_state != CLOSED && proto->state == CLOSED) 363 del_timer(&proto->timer); 364 365 #if DEBUG_STATE 366 printk(KERN_DEBUG "%s: %s ppp_cp_event(%s) ... %s\n", dev->name, 367 proto_name(pid), event_names[event], state_names[proto->state]); 368 #endif 369 } 370 371 372 static void ppp_cp_parse_cr(struct net_device *dev, u16 pid, u8 id, 373 unsigned int req_len, const u8 *data) 374 { 375 static u8 const valid_accm[6] = { LCP_OPTION_ACCM, 6, 0, 0, 0, 0 }; 376 const u8 *opt; 377 u8 *out; 378 unsigned int len = req_len, nak_len = 0, rej_len = 0; 379 380 if (!(out = kmalloc(len, GFP_ATOMIC))) { 381 dev->stats.rx_dropped++; 382 return; /* out of memory, ignore CR packet */ 383 } 384 385 for (opt = data; len; len -= opt[1], opt += opt[1]) { 386 if (len < 2 || len < opt[1]) { 387 dev->stats.rx_errors++; 388 kfree(out); 389 return; /* bad packet, drop silently */ 390 } 391 392 if (pid == PID_LCP) 393 switch (opt[0]) { 394 case LCP_OPTION_MRU: 395 continue; /* MRU always OK and > 1500 bytes? */ 396 397 case LCP_OPTION_ACCM: /* async control character map */ 398 if (!memcmp(opt, valid_accm, 399 sizeof(valid_accm))) 400 continue; 401 if (!rej_len) { /* NAK it */ 402 memcpy(out + nak_len, valid_accm, 403 sizeof(valid_accm)); 404 nak_len += sizeof(valid_accm); 405 continue; 406 } 407 break; 408 case LCP_OPTION_MAGIC: 409 if (opt[1] != 6 || (!opt[2] && !opt[3] && 410 !opt[4] && !opt[5])) 411 break; /* reject invalid magic number */ 412 continue; 413 } 414 /* reject this option */ 415 memcpy(out + rej_len, opt, opt[1]); 416 rej_len += opt[1]; 417 } 418 419 if (rej_len) 420 ppp_cp_event(dev, pid, RCR_BAD, CP_CONF_REJ, id, rej_len, out); 421 else if (nak_len) 422 ppp_cp_event(dev, pid, RCR_BAD, CP_CONF_NAK, id, nak_len, out); 423 else 424 ppp_cp_event(dev, pid, RCR_GOOD, CP_CONF_ACK, id, req_len, data); 425 426 kfree(out); 427 } 428 429 static int ppp_rx(struct sk_buff *skb) 430 { 431 struct hdlc_header *hdr = (struct hdlc_header*)skb->data; 432 struct net_device *dev = skb->dev; 433 struct ppp *ppp = get_ppp(dev); 434 struct proto *proto; 435 struct cp_header *cp; 436 unsigned long flags; 437 unsigned int len; 438 u16 pid; 439 #if DEBUG_CP 440 int i; 441 char *ptr; 442 #endif 443 444 spin_lock_irqsave(&ppp->lock, flags); 445 /* Check HDLC header */ 446 if (skb->len < sizeof(struct hdlc_header)) 447 goto rx_error; 448 cp = skb_pull(skb, sizeof(struct hdlc_header)); 449 if (hdr->address != HDLC_ADDR_ALLSTATIONS || 450 hdr->control != HDLC_CTRL_UI) 451 goto rx_error; 452 453 pid = ntohs(hdr->protocol); 454 proto = get_proto(dev, pid); 455 if (!proto) { 456 if (ppp->protos[IDX_LCP].state == OPENED) 457 ppp_tx_cp(dev, PID_LCP, LCP_PROTO_REJ, 458 ++ppp->seq, skb->len + 2, &hdr->protocol); 459 goto rx_error; 460 } 461 462 len = ntohs(cp->len); 463 if (len < sizeof(struct cp_header) /* no complete CP header? */ || 464 skb->len < len /* truncated packet? */) 465 goto rx_error; 466 skb_pull(skb, sizeof(struct cp_header)); 467 len -= sizeof(struct cp_header); 468 469 /* HDLC and CP headers stripped from skb */ 470 #if DEBUG_CP 471 if (cp->code < CP_CODES) 472 sprintf(debug_buffer, "[%s id 0x%X]", code_names[cp->code], 473 cp->id); 474 else 475 sprintf(debug_buffer, "[code %u id 0x%X]", cp->code, cp->id); 476 ptr = debug_buffer + strlen(debug_buffer); 477 for (i = 0; i < min_t(unsigned int, len, DEBUG_CP); i++) { 478 sprintf(ptr, " %02X", skb->data[i]); 479 ptr += strlen(ptr); 480 } 481 printk(KERN_DEBUG "%s: RX %s %s\n", dev->name, proto_name(pid), 482 debug_buffer); 483 #endif 484 485 /* LCP only */ 486 if (pid == PID_LCP) 487 switch (cp->code) { 488 case LCP_PROTO_REJ: 489 pid = ntohs(*(__be16*)skb->data); 490 if (pid == PID_LCP || pid == PID_IPCP || 491 pid == PID_IPV6CP) 492 ppp_cp_event(dev, pid, RXJ_BAD, 0, 0, 493 0, NULL); 494 goto out; 495 496 case LCP_ECHO_REQ: /* send Echo-Reply */ 497 if (len >= 4 && proto->state == OPENED) 498 ppp_tx_cp(dev, PID_LCP, LCP_ECHO_REPLY, 499 cp->id, len - 4, skb->data + 4); 500 goto out; 501 502 case LCP_ECHO_REPLY: 503 if (cp->id == ppp->echo_id) 504 ppp->last_pong = jiffies; 505 goto out; 506 507 case LCP_DISC_REQ: /* discard */ 508 goto out; 509 } 510 511 /* LCP, IPCP and IPV6CP */ 512 switch (cp->code) { 513 case CP_CONF_REQ: 514 ppp_cp_parse_cr(dev, pid, cp->id, len, skb->data); 515 break; 516 517 case CP_CONF_ACK: 518 if (cp->id == proto->cr_id) 519 ppp_cp_event(dev, pid, RCA, 0, 0, 0, NULL); 520 break; 521 522 case CP_CONF_REJ: 523 case CP_CONF_NAK: 524 if (cp->id == proto->cr_id) 525 ppp_cp_event(dev, pid, RCN, 0, 0, 0, NULL); 526 break; 527 528 case CP_TERM_REQ: 529 ppp_cp_event(dev, pid, RTR, 0, cp->id, 0, NULL); 530 break; 531 532 case CP_TERM_ACK: 533 ppp_cp_event(dev, pid, RTA, 0, 0, 0, NULL); 534 break; 535 536 case CP_CODE_REJ: 537 ppp_cp_event(dev, pid, RXJ_BAD, 0, 0, 0, NULL); 538 break; 539 540 default: 541 len += sizeof(struct cp_header); 542 if (len > dev->mtu) 543 len = dev->mtu; 544 ppp_cp_event(dev, pid, RUC, 0, 0, len, cp); 545 break; 546 } 547 goto out; 548 549 rx_error: 550 dev->stats.rx_errors++; 551 out: 552 spin_unlock_irqrestore(&ppp->lock, flags); 553 dev_kfree_skb_any(skb); 554 ppp_tx_flush(); 555 return NET_RX_DROP; 556 } 557 558 static void ppp_timer(struct timer_list *t) 559 { 560 struct proto *proto = from_timer(proto, t, timer); 561 struct ppp *ppp = get_ppp(proto->dev); 562 unsigned long flags; 563 564 spin_lock_irqsave(&ppp->lock, flags); 565 switch (proto->state) { 566 case STOPPING: 567 case REQ_SENT: 568 case ACK_RECV: 569 case ACK_SENT: 570 if (proto->restart_counter) { 571 ppp_cp_event(proto->dev, proto->pid, TO_GOOD, 0, 0, 572 0, NULL); 573 proto->restart_counter--; 574 } else if (netif_carrier_ok(proto->dev)) 575 ppp_cp_event(proto->dev, proto->pid, TO_GOOD, 0, 0, 576 0, NULL); 577 else 578 ppp_cp_event(proto->dev, proto->pid, TO_BAD, 0, 0, 579 0, NULL); 580 break; 581 582 case OPENED: 583 if (proto->pid != PID_LCP) 584 break; 585 if (time_after(jiffies, ppp->last_pong + 586 ppp->keepalive_timeout * HZ)) { 587 netdev_info(proto->dev, "Link down\n"); 588 ppp_cp_event(proto->dev, PID_LCP, STOP, 0, 0, 0, NULL); 589 ppp_cp_event(proto->dev, PID_LCP, START, 0, 0, 0, NULL); 590 } else { /* send keep-alive packet */ 591 ppp->echo_id = ++ppp->seq; 592 ppp_tx_cp(proto->dev, PID_LCP, LCP_ECHO_REQ, 593 ppp->echo_id, 0, NULL); 594 proto->timer.expires = jiffies + 595 ppp->keepalive_interval * HZ; 596 add_timer(&proto->timer); 597 } 598 break; 599 } 600 spin_unlock_irqrestore(&ppp->lock, flags); 601 ppp_tx_flush(); 602 } 603 604 605 static void ppp_start(struct net_device *dev) 606 { 607 struct ppp *ppp = get_ppp(dev); 608 int i; 609 610 for (i = 0; i < IDX_COUNT; i++) { 611 struct proto *proto = &ppp->protos[i]; 612 proto->dev = dev; 613 timer_setup(&proto->timer, ppp_timer, 0); 614 proto->state = CLOSED; 615 } 616 ppp->protos[IDX_LCP].pid = PID_LCP; 617 ppp->protos[IDX_IPCP].pid = PID_IPCP; 618 ppp->protos[IDX_IPV6CP].pid = PID_IPV6CP; 619 620 ppp_cp_event(dev, PID_LCP, START, 0, 0, 0, NULL); 621 } 622 623 static void ppp_stop(struct net_device *dev) 624 { 625 ppp_cp_event(dev, PID_LCP, STOP, 0, 0, 0, NULL); 626 } 627 628 static void ppp_close(struct net_device *dev) 629 { 630 ppp_tx_flush(); 631 } 632 633 static struct hdlc_proto proto = { 634 .start = ppp_start, 635 .stop = ppp_stop, 636 .close = ppp_close, 637 .type_trans = ppp_type_trans, 638 .ioctl = ppp_ioctl, 639 .netif_rx = ppp_rx, 640 .module = THIS_MODULE, 641 }; 642 643 static const struct header_ops ppp_header_ops = { 644 .create = ppp_hard_header, 645 }; 646 647 static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr) 648 { 649 hdlc_device *hdlc = dev_to_hdlc(dev); 650 struct ppp *ppp; 651 int result; 652 653 switch (ifr->ifr_settings.type) { 654 case IF_GET_PROTO: 655 if (dev_to_hdlc(dev)->proto != &proto) 656 return -EINVAL; 657 ifr->ifr_settings.type = IF_PROTO_PPP; 658 return 0; /* return protocol only, no settable parameters */ 659 660 case IF_PROTO_PPP: 661 if (!capable(CAP_NET_ADMIN)) 662 return -EPERM; 663 664 if (dev->flags & IFF_UP) 665 return -EBUSY; 666 667 /* no settable parameters */ 668 669 result = hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT); 670 if (result) 671 return result; 672 673 result = attach_hdlc_protocol(dev, &proto, sizeof(struct ppp)); 674 if (result) 675 return result; 676 677 ppp = get_ppp(dev); 678 spin_lock_init(&ppp->lock); 679 ppp->req_timeout = 2; 680 ppp->cr_retries = 10; 681 ppp->term_retries = 2; 682 ppp->keepalive_interval = 10; 683 ppp->keepalive_timeout = 60; 684 685 dev->hard_header_len = sizeof(struct hdlc_header); 686 dev->header_ops = &ppp_header_ops; 687 dev->type = ARPHRD_PPP; 688 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev); 689 netif_dormant_on(dev); 690 return 0; 691 } 692 693 return -EINVAL; 694 } 695 696 697 static int __init mod_init(void) 698 { 699 skb_queue_head_init(&tx_queue); 700 register_hdlc_protocol(&proto); 701 return 0; 702 } 703 704 static void __exit mod_exit(void) 705 { 706 unregister_hdlc_protocol(&proto); 707 } 708 709 710 module_init(mod_init); 711 module_exit(mod_exit); 712 713 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); 714 MODULE_DESCRIPTION("PPP protocol support for generic HDLC"); 715 MODULE_LICENSE("GPL v2"); 716