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hdlc_ppp.c
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linux-6.19.14/drivers/net/wan/hdlc_ppp.c
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 35enum {IDX_LCP = 0, IDX_IPCP, IDX_IPV6CP, IDX_COUNT}; 36enum {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 40static const char *const code_names[CP_CODES] = { 41 "0", "ConfReq", "ConfAck", "ConfNak", "ConfRej", "TermReq", 42 "TermAck", "CodeRej", "ProtoRej", "EchoReq", "EchoReply", "Discard" 43}; 44 45static char debug_buffer[64 + 3 * DEBUG_CP]; 46#endif 47 48enum {LCP_OPTION_MRU = 1, LCP_OPTION_ACCM, LCP_OPTION_MAGIC = 5}; 49 50struct hdlc_header { 51 u8 address; 52 u8 control; 53 __be16 protocol; 54}; 55 56struct cp_header { 57 u8 code; 58 u8 id; 59 __be16 len; 60}; 61 62struct 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 72struct 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 82enum {CLOSED = 0, STOPPED, STOPPING, REQ_SENT, ACK_RECV, ACK_SENT, OPENED, 83 STATES, STATE_MASK = 0xF}; 84enum {START = 0, STOP, TO_GOOD, TO_BAD, RCR_GOOD, RCR_BAD, RCA, RCN, RTR, RTA, 85 RUC, RXJ_GOOD, RXJ_BAD, EVENTS}; 86enum {INV = 0x10, IRC = 0x20, ZRC = 0x40, SCR = 0x80, SCA = 0x100, 87 SCN = 0x200, STR = 0x400, STA = 0x800, SCJ = 0x1000}; 88 89#if DEBUG_STATE 90static const char *const state_names[STATES] = { 91 "Closed", "Stopped", "Stopping", "ReqSent", "AckRecv", "AckSent", 92 "Opened" 93}; 94 95static 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 101static struct sk_buff_head tx_queue; /* used when holding the spin lock */ 102 103static int ppp_ioctl(struct net_device *dev, struct if_settings *ifs); 104 105static inline struct ppp *get_ppp(struct net_device *dev) 106{ 107 return (struct ppp *)dev_to_hdlc(dev)->state; 108} 109 110static 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 126static inline const char *proto_name(u16 pid) 127{ 128 switch (pid) { 129 case PID_IPCP: 130 return "IPCP"; 131 case PID_IPV6CP: 132 return "IPV6CP"; 133 default: 134 return "LCP"; 135 } 136} 137 138static __be16 ppp_type_trans(struct sk_buff *skb, struct net_device *dev) 139{ 140 struct hdlc_header *data = (struct hdlc_header *)skb->data; 141 142 if (skb->len < sizeof(struct hdlc_header)) 143 return htons(ETH_P_HDLC); 144 if (data->address != HDLC_ADDR_ALLSTATIONS || 145 data->control != HDLC_CTRL_UI) 146 return htons(ETH_P_HDLC); 147 148 switch (data->protocol) { 149 case cpu_to_be16(PID_IP): 150 skb_pull(skb, sizeof(struct hdlc_header)); 151 return htons(ETH_P_IP); 152 153 case cpu_to_be16(PID_IPV6): 154 skb_pull(skb, sizeof(struct hdlc_header)); 155 return htons(ETH_P_IPV6); 156 157 default: 158 return htons(ETH_P_HDLC); 159 } 160} 161 162static int ppp_hard_header(struct sk_buff *skb, struct net_device *dev, 163 u16 type, const void *daddr, const void *saddr, 164 unsigned int len) 165{ 166 struct hdlc_header *data; 167#if DEBUG_HARD_HEADER 168 printk(KERN_DEBUG "%s: ppp_hard_header() called\n", dev->name); 169#endif 170 171 skb_push(skb, sizeof(struct hdlc_header)); 172 data = (struct hdlc_header *)skb->data; 173 174 data->address = HDLC_ADDR_ALLSTATIONS; 175 data->control = HDLC_CTRL_UI; 176 switch (type) { 177 case ETH_P_IP: 178 data->protocol = htons(PID_IP); 179 break; 180 case ETH_P_IPV6: 181 data->protocol = htons(PID_IPV6); 182 break; 183 case PID_LCP: 184 case PID_IPCP: 185 case PID_IPV6CP: 186 data->protocol = htons(type); 187 break; 188 default: /* unknown protocol */ 189 data->protocol = 0; 190 } 191 return sizeof(struct hdlc_header); 192} 193 194static void ppp_tx_flush(void) 195{ 196 struct sk_buff *skb; 197 198 while ((skb = skb_dequeue(&tx_queue)) != NULL) 199 dev_queue_xmit(skb); 200} 201 202static void ppp_tx_cp(struct net_device *dev, u16 pid, u8 code, 203 u8 id, unsigned int len, const void *data) 204{ 205 struct sk_buff *skb; 206 struct cp_header *cp; 207 unsigned int magic_len = 0; 208 static u32 magic; 209 210#if DEBUG_CP 211 int i; 212 char *ptr; 213#endif 214 215 if (pid == PID_LCP && (code == LCP_ECHO_REQ || code == LCP_ECHO_REPLY)) 216 magic_len = sizeof(magic); 217 218 skb = dev_alloc_skb(sizeof(struct hdlc_header) + 219 sizeof(struct cp_header) + magic_len + len); 220 if (!skb) 221 return; 222 223 skb_reserve(skb, sizeof(struct hdlc_header)); 224 225 cp = skb_put(skb, sizeof(struct cp_header)); 226 cp->code = code; 227 cp->id = id; 228 cp->len = htons(sizeof(struct cp_header) + magic_len + len); 229 230 if (magic_len) 231 skb_put_data(skb, &magic, magic_len); 232 if (len) 233 skb_put_data(skb, data, len); 234 235#if DEBUG_CP 236 BUG_ON(code >= CP_CODES); 237 ptr = debug_buffer; 238 *ptr = '\x0'; 239 for (i = 0; i < min_t(unsigned int, magic_len + len, DEBUG_CP); i++) { 240 sprintf(ptr, " %02X", skb->data[sizeof(struct cp_header) + i]); 241 ptr += strlen(ptr); 242 } 243 printk(KERN_DEBUG "%s: TX %s [%s id 0x%X]%s\n", dev->name, 244 proto_name(pid), code_names[code], id, debug_buffer); 245#endif 246 247 ppp_hard_header(skb, dev, pid, NULL, NULL, 0); 248 249 skb->priority = TC_PRIO_CONTROL; 250 skb->dev = dev; 251 skb->protocol = htons(ETH_P_HDLC); 252 skb_reset_network_header(skb); 253 skb_queue_tail(&tx_queue, skb); 254} 255 256/* State transition table (compare STD-51) 257 Events Actions 258 TO+ = Timeout with counter > 0 irc = Initialize-Restart-Count 259 TO- = Timeout with counter expired zrc = Zero-Restart-Count 260 261 RCR+ = Receive-Configure-Request (Good) scr = Send-Configure-Request 262 RCR- = Receive-Configure-Request (Bad) 263 RCA = Receive-Configure-Ack sca = Send-Configure-Ack 264 RCN = Receive-Configure-Nak/Rej scn = Send-Configure-Nak/Rej 265 266 RTR = Receive-Terminate-Request str = Send-Terminate-Request 267 RTA = Receive-Terminate-Ack sta = Send-Terminate-Ack 268 269 RUC = Receive-Unknown-Code scj = Send-Code-Reject 270 RXJ+ = Receive-Code-Reject (permitted) 271 or Receive-Protocol-Reject 272 RXJ- = Receive-Code-Reject (catastrophic) 273 or Receive-Protocol-Reject 274*/ 275static int cp_table[EVENTS][STATES] = { 276 /* CLOSED STOPPED STOPPING REQ_SENT ACK_RECV ACK_SENT OPENED 277 0 1 2 3 4 5 6 */ 278 {IRC|SCR|3, INV , INV , INV , INV , INV , INV }, /* START */ 279 { INV , 0 , 0 , 0 , 0 , 0 , 0 }, /* STOP */ 280 { INV , INV ,STR|2, SCR|3 ,SCR|3, SCR|5 , INV }, /* TO+ */ 281 { INV , INV , 1 , 1 , 1 , 1 , INV }, /* TO- */ 282 { STA|0 ,IRC|SCR|SCA|5, 2 , SCA|5 ,SCA|6, SCA|5 ,SCR|SCA|5}, /* RCR+ */ 283 { STA|0 ,IRC|SCR|SCN|3, 2 , SCN|3 ,SCN|4, SCN|3 ,SCR|SCN|3}, /* RCR- */ 284 { STA|0 , STA|1 , 2 , IRC|4 ,SCR|3, 6 , SCR|3 }, /* RCA */ 285 { STA|0 , STA|1 , 2 ,IRC|SCR|3,SCR|3,IRC|SCR|5, SCR|3 }, /* RCN */ 286 { STA|0 , STA|1 ,STA|2, STA|3 ,STA|3, STA|3 ,ZRC|STA|2}, /* RTR */ 287 { 0 , 1 , 1 , 3 , 3 , 5 , SCR|3 }, /* RTA */ 288 { SCJ|0 , SCJ|1 ,SCJ|2, SCJ|3 ,SCJ|4, SCJ|5 , SCJ|6 }, /* RUC */ 289 { 0 , 1 , 2 , 3 , 3 , 5 , 6 }, /* RXJ+ */ 290 { 0 , 1 , 1 , 1 , 1 , 1 ,IRC|STR|2}, /* RXJ- */ 291}; 292 293/* SCA: RCR+ must supply id, len and data 294 SCN: RCR- must supply code, id, len and data 295 STA: RTR must supply id 296 SCJ: RUC must supply CP packet len and data */ 297static void ppp_cp_event(struct net_device *dev, u16 pid, u16 event, u8 code, 298 u8 id, unsigned int len, const void *data) 299{ 300 int old_state, action; 301 struct ppp *ppp = get_ppp(dev); 302 struct proto *proto = get_proto(dev, pid); 303 304 old_state = proto->state; 305 BUG_ON(old_state >= STATES); 306 BUG_ON(event >= EVENTS); 307 308#if DEBUG_STATE 309 printk(KERN_DEBUG "%s: %s ppp_cp_event(%s) %s ...\n", dev->name, 310 proto_name(pid), event_names[event], state_names[proto->state]); 311#endif 312 313 action = cp_table[event][old_state]; 314 315 proto->state = action & STATE_MASK; 316 if (action & (SCR | STR)) /* set Configure-Req/Terminate-Req timer */ 317 mod_timer(&proto->timer, proto->timeout = 318 jiffies + ppp->req_timeout * HZ); 319 if (action & ZRC) 320 proto->restart_counter = 0; 321 if (action & IRC) 322 proto->restart_counter = (proto->state == STOPPING) ? 323 ppp->term_retries : ppp->cr_retries; 324 325 if (action & SCR) /* send Configure-Request */ 326 ppp_tx_cp(dev, pid, CP_CONF_REQ, proto->cr_id = ++ppp->seq, 327 0, NULL); 328 if (action & SCA) /* send Configure-Ack */ 329 ppp_tx_cp(dev, pid, CP_CONF_ACK, id, len, data); 330 if (action & SCN) /* send Configure-Nak/Reject */ 331 ppp_tx_cp(dev, pid, code, id, len, data); 332 if (action & STR) /* send Terminate-Request */ 333 ppp_tx_cp(dev, pid, CP_TERM_REQ, ++ppp->seq, 0, NULL); 334 if (action & STA) /* send Terminate-Ack */ 335 ppp_tx_cp(dev, pid, CP_TERM_ACK, id, 0, NULL); 336 if (action & SCJ) /* send Code-Reject */ 337 ppp_tx_cp(dev, pid, CP_CODE_REJ, ++ppp->seq, len, data); 338 339 if (old_state != OPENED && proto->state == OPENED) { 340 netdev_info(dev, "%s up\n", proto_name(pid)); 341 if (pid == PID_LCP) { 342 netif_dormant_off(dev); 343 ppp_cp_event(dev, PID_IPCP, START, 0, 0, 0, NULL); 344 ppp_cp_event(dev, PID_IPV6CP, START, 0, 0, 0, NULL); 345 ppp->last_pong = jiffies; 346 mod_timer(&proto->timer, proto->timeout = 347 jiffies + ppp->keepalive_interval * HZ); 348 } 349 } 350 if (old_state == OPENED && proto->state != OPENED) { 351 netdev_info(dev, "%s down\n", proto_name(pid)); 352 if (pid == PID_LCP) { 353 netif_dormant_on(dev); 354 ppp_cp_event(dev, PID_IPCP, STOP, 0, 0, 0, NULL); 355 ppp_cp_event(dev, PID_IPV6CP, STOP, 0, 0, 0, NULL); 356 } 357 } 358 if (old_state != CLOSED && proto->state == CLOSED) 359 timer_delete(&proto->timer); 360 361#if DEBUG_STATE 362 printk(KERN_DEBUG "%s: %s ppp_cp_event(%s) ... %s\n", dev->name, 363 proto_name(pid), event_names[event], state_names[proto->state]); 364#endif 365} 366 367static void ppp_cp_parse_cr(struct net_device *dev, u16 pid, u8 id, 368 unsigned int req_len, const u8 *data) 369{ 370 static u8 const valid_accm[6] = { LCP_OPTION_ACCM, 6, 0, 0, 0, 0 }; 371 const u8 *opt; 372 u8 *out; 373 unsigned int len = req_len, nak_len = 0, rej_len = 0; 374 375 out = kmalloc(len, GFP_ATOMIC); 376 if (!out) { 377 dev->stats.rx_dropped++; 378 return; /* out of memory, ignore CR packet */ 379 } 380 381 for (opt = data; len; len -= opt[1], opt += opt[1]) { 382 if (len < 2 || opt[1] < 2 || len < opt[1]) 383 goto err_out; 384 385 if (pid == PID_LCP) 386 switch (opt[0]) { 387 case LCP_OPTION_MRU: 388 continue; /* MRU always OK and > 1500 bytes? */ 389 390 case LCP_OPTION_ACCM: /* async control character map */ 391 if (opt[1] < sizeof(valid_accm)) 392 goto err_out; 393 if (!memcmp(opt, valid_accm, 394 sizeof(valid_accm))) 395 continue; 396 if (!rej_len) { /* NAK it */ 397 memcpy(out + nak_len, valid_accm, 398 sizeof(valid_accm)); 399 nak_len += sizeof(valid_accm); 400 continue; 401 } 402 break; 403 case LCP_OPTION_MAGIC: 404 if (len < 6) 405 goto err_out; 406 if (opt[1] != 6 || (!opt[2] && !opt[3] && 407 !opt[4] && !opt[5])) 408 break; /* reject invalid magic number */ 409 continue; 410 } 411 /* reject this option */ 412 memcpy(out + rej_len, opt, opt[1]); 413 rej_len += opt[1]; 414 } 415 416 if (rej_len) 417 ppp_cp_event(dev, pid, RCR_BAD, CP_CONF_REJ, id, rej_len, out); 418 else if (nak_len) 419 ppp_cp_event(dev, pid, RCR_BAD, CP_CONF_NAK, id, nak_len, out); 420 else 421 ppp_cp_event(dev, pid, RCR_GOOD, CP_CONF_ACK, id, req_len, data); 422 423 kfree(out); 424 return; 425 426err_out: 427 dev->stats.rx_errors++; 428 kfree(out); 429} 430 431static int ppp_rx(struct sk_buff *skb) 432{ 433 struct hdlc_header *hdr = (struct hdlc_header *)skb->data; 434 struct net_device *dev = skb->dev; 435 struct ppp *ppp = get_ppp(dev); 436 struct proto *proto; 437 struct cp_header *cp; 438 unsigned long flags; 439 unsigned int len; 440 u16 pid; 441#if DEBUG_CP 442 int i; 443 char *ptr; 444#endif 445 446 spin_lock_irqsave(&ppp->lock, flags); 447 /* Check HDLC header */ 448 if (skb->len < sizeof(struct hdlc_header)) 449 goto rx_error; 450 cp = skb_pull(skb, sizeof(struct hdlc_header)); 451 if (hdr->address != HDLC_ADDR_ALLSTATIONS || 452 hdr->control != HDLC_CTRL_UI) 453 goto rx_error; 454 455 pid = ntohs(hdr->protocol); 456 proto = get_proto(dev, pid); 457 if (!proto) { 458 if (ppp->protos[IDX_LCP].state == OPENED) 459 ppp_tx_cp(dev, PID_LCP, LCP_PROTO_REJ, 460 ++ppp->seq, skb->len + 2, &hdr->protocol); 461 goto rx_error; 462 } 463 464 len = ntohs(cp->len); 465 if (len < sizeof(struct cp_header) /* no complete CP header? */ || 466 skb->len < len /* truncated packet? */) 467 goto rx_error; 468 skb_pull(skb, sizeof(struct cp_header)); 469 len -= sizeof(struct cp_header); 470 471 /* HDLC and CP headers stripped from skb */ 472#if DEBUG_CP 473 if (cp->code < CP_CODES) 474 sprintf(debug_buffer, "[%s id 0x%X]", code_names[cp->code], 475 cp->id); 476 else 477 sprintf(debug_buffer, "[code %u id 0x%X]", cp->code, cp->id); 478 ptr = debug_buffer + strlen(debug_buffer); 479 for (i = 0; i < min_t(unsigned int, len, DEBUG_CP); i++) { 480 sprintf(ptr, " %02X", skb->data[i]); 481 ptr += strlen(ptr); 482 } 483 printk(KERN_DEBUG "%s: RX %s %s\n", dev->name, proto_name(pid), 484 debug_buffer); 485#endif 486 487 /* LCP only */ 488 if (pid == PID_LCP) 489 switch (cp->code) { 490 case LCP_PROTO_REJ: 491 pid = ntohs(*(__be16 *)skb->data); 492 if (pid == PID_LCP || pid == PID_IPCP || 493 pid == PID_IPV6CP) 494 ppp_cp_event(dev, pid, RXJ_BAD, 0, 0, 495 0, NULL); 496 goto out; 497 498 case LCP_ECHO_REQ: /* send Echo-Reply */ 499 if (len >= 4 && proto->state == OPENED) 500 ppp_tx_cp(dev, PID_LCP, LCP_ECHO_REPLY, 501 cp->id, len - 4, skb->data + 4); 502 goto out; 503 504 case LCP_ECHO_REPLY: 505 if (cp->id == ppp->echo_id) 506 ppp->last_pong = jiffies; 507 goto out; 508 509 case LCP_DISC_REQ: /* discard */ 510 goto out; 511 } 512 513 /* LCP, IPCP and IPV6CP */ 514 switch (cp->code) { 515 case CP_CONF_REQ: 516 ppp_cp_parse_cr(dev, pid, cp->id, len, skb->data); 517 break; 518 519 case CP_CONF_ACK: 520 if (cp->id == proto->cr_id) 521 ppp_cp_event(dev, pid, RCA, 0, 0, 0, NULL); 522 break; 523 524 case CP_CONF_REJ: 525 case CP_CONF_NAK: 526 if (cp->id == proto->cr_id) 527 ppp_cp_event(dev, pid, RCN, 0, 0, 0, NULL); 528 break; 529 530 case CP_TERM_REQ: 531 ppp_cp_event(dev, pid, RTR, 0, cp->id, 0, NULL); 532 break; 533 534 case CP_TERM_ACK: 535 ppp_cp_event(dev, pid, RTA, 0, 0, 0, NULL); 536 break; 537 538 case CP_CODE_REJ: 539 ppp_cp_event(dev, pid, RXJ_BAD, 0, 0, 0, NULL); 540 break; 541 542 default: 543 len += sizeof(struct cp_header); 544 if (len > dev->mtu) 545 len = dev->mtu; 546 ppp_cp_event(dev, pid, RUC, 0, 0, len, cp); 547 break; 548 } 549 goto out; 550 551rx_error: 552 dev->stats.rx_errors++; 553out: 554 spin_unlock_irqrestore(&ppp->lock, flags); 555 dev_kfree_skb_any(skb); 556 ppp_tx_flush(); 557 return NET_RX_DROP; 558} 559 560static void ppp_timer(struct timer_list *t) 561{ 562 struct proto *proto = timer_container_of(proto, t, timer); 563 struct ppp *ppp = get_ppp(proto->dev); 564 unsigned long flags; 565 566 spin_lock_irqsave(&ppp->lock, flags); 567 /* mod_timer could be called after we entered this function but 568 * before we got the lock. 569 */ 570 if (timer_pending(&proto->timer)) { 571 spin_unlock_irqrestore(&ppp->lock, flags); 572 return; 573 } 574 switch (proto->state) { 575 case STOPPING: 576 case REQ_SENT: 577 case ACK_RECV: 578 case ACK_SENT: 579 if (proto->restart_counter) { 580 ppp_cp_event(proto->dev, proto->pid, TO_GOOD, 0, 0, 581 0, NULL); 582 proto->restart_counter--; 583 } else if (netif_carrier_ok(proto->dev)) 584 ppp_cp_event(proto->dev, proto->pid, TO_GOOD, 0, 0, 585 0, NULL); 586 else 587 ppp_cp_event(proto->dev, proto->pid, TO_BAD, 0, 0, 588 0, NULL); 589 break; 590 591 case OPENED: 592 if (proto->pid != PID_LCP) 593 break; 594 if (time_after(jiffies, ppp->last_pong + 595 ppp->keepalive_timeout * HZ)) { 596 netdev_info(proto->dev, "Link down\n"); 597 ppp_cp_event(proto->dev, PID_LCP, STOP, 0, 0, 0, NULL); 598 ppp_cp_event(proto->dev, PID_LCP, START, 0, 0, 0, NULL); 599 } else { /* send keep-alive packet */ 600 ppp->echo_id = ++ppp->seq; 601 ppp_tx_cp(proto->dev, PID_LCP, LCP_ECHO_REQ, 602 ppp->echo_id, 0, NULL); 603 proto->timer.expires = jiffies + 604 ppp->keepalive_interval * HZ; 605 add_timer(&proto->timer); 606 } 607 break; 608 } 609 spin_unlock_irqrestore(&ppp->lock, flags); 610 ppp_tx_flush(); 611} 612 613static void ppp_start(struct net_device *dev) 614{ 615 struct ppp *ppp = get_ppp(dev); 616 int i; 617 618 for (i = 0; i < IDX_COUNT; i++) { 619 struct proto *proto = &ppp->protos[i]; 620 621 proto->dev = dev; 622 timer_setup(&proto->timer, ppp_timer, 0); 623 proto->state = CLOSED; 624 } 625 ppp->protos[IDX_LCP].pid = PID_LCP; 626 ppp->protos[IDX_IPCP].pid = PID_IPCP; 627 ppp->protos[IDX_IPV6CP].pid = PID_IPV6CP; 628 629 ppp_cp_event(dev, PID_LCP, START, 0, 0, 0, NULL); 630} 631 632static void ppp_stop(struct net_device *dev) 633{ 634 ppp_cp_event(dev, PID_LCP, STOP, 0, 0, 0, NULL); 635} 636 637static void ppp_close(struct net_device *dev) 638{ 639 ppp_tx_flush(); 640} 641 642static struct hdlc_proto proto = { 643 .start = ppp_start, 644 .stop = ppp_stop, 645 .close = ppp_close, 646 .type_trans = ppp_type_trans, 647 .ioctl = ppp_ioctl, 648 .netif_rx = ppp_rx, 649 .module = THIS_MODULE, 650}; 651 652static const struct header_ops ppp_header_ops = { 653 .create = ppp_hard_header, 654}; 655 656static int ppp_ioctl(struct net_device *dev, struct if_settings *ifs) 657{ 658 hdlc_device *hdlc = dev_to_hdlc(dev); 659 struct ppp *ppp; 660 int result; 661 662 switch (ifs->type) { 663 case IF_GET_PROTO: 664 if (dev_to_hdlc(dev)->proto != &proto) 665 return -EINVAL; 666 ifs->type = IF_PROTO_PPP; 667 return 0; /* return protocol only, no settable parameters */ 668 669 case IF_PROTO_PPP: 670 if (!capable(CAP_NET_ADMIN)) 671 return -EPERM; 672 673 if (dev->flags & IFF_UP) 674 return -EBUSY; 675 676 /* no settable parameters */ 677 678 result = hdlc->attach(dev, ENCODING_NRZ, 679 PARITY_CRC16_PR1_CCITT); 680 if (result) 681 return result; 682 683 result = attach_hdlc_protocol(dev, &proto, sizeof(struct ppp)); 684 if (result) 685 return result; 686 687 ppp = get_ppp(dev); 688 spin_lock_init(&ppp->lock); 689 ppp->req_timeout = 2; 690 ppp->cr_retries = 10; 691 ppp->term_retries = 2; 692 ppp->keepalive_interval = 10; 693 ppp->keepalive_timeout = 60; 694 695 dev->hard_header_len = sizeof(struct hdlc_header); 696 dev->header_ops = &ppp_header_ops; 697 dev->type = ARPHRD_PPP; 698 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev); 699 netif_dormant_on(dev); 700 return 0; 701 } 702 703 return -EINVAL; 704} 705 706static int __init hdlc_ppp_init(void) 707{ 708 skb_queue_head_init(&tx_queue); 709 register_hdlc_protocol(&proto); 710 return 0; 711} 712 713static void __exit hdlc_ppp_exit(void) 714{ 715 unregister_hdlc_protocol(&proto); 716} 717 718module_init(hdlc_ppp_init); 719module_exit(hdlc_ppp_exit); 720 721MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); 722MODULE_DESCRIPTION("PPP protocol support for generic HDLC"); 723MODULE_LICENSE("GPL v2");
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