Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * NET3: A (fairly minimal) implementation of synchronous PPP for Linux |
| 3 | * as well as a CISCO HDLC implementation. See the copyright |
| 4 | * message below for the original source. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the license, or (at your option) any later version. |
| 10 | * |
| 11 | * Note however. This code is also used in a different form by FreeBSD. |
| 12 | * Therefore when making any non OS specific change please consider |
| 13 | * contributing it back to the original author under the terms |
| 14 | * below in addition. |
| 15 | * -- Alan |
| 16 | * |
| 17 | * Port for Linux-2.1 by Jan "Yenya" Kasprzak <kas@fi.muni.cz> |
| 18 | */ |
| 19 | |
| 20 | /* |
| 21 | * Synchronous PPP/Cisco link level subroutines. |
| 22 | * Keepalive protocol implemented in both Cisco and PPP modes. |
| 23 | * |
| 24 | * Copyright (C) 1994 Cronyx Ltd. |
| 25 | * Author: Serge Vakulenko, <vak@zebub.msk.su> |
| 26 | * |
| 27 | * This software is distributed with NO WARRANTIES, not even the implied |
| 28 | * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| 29 | * |
| 30 | * Authors grant any other persons or organisations permission to use |
| 31 | * or modify this software as long as this message is kept with the software, |
| 32 | * all derivative works or modified versions. |
| 33 | * |
| 34 | * Version 1.9, Wed Oct 4 18:58:15 MSK 1995 |
| 35 | * |
| 36 | * $Id: syncppp.c,v 1.18 2000/04/11 05:25:31 asj Exp $ |
| 37 | */ |
| 38 | #undef DEBUG |
| 39 | |
| 40 | #include <linux/config.h> |
| 41 | #include <linux/module.h> |
| 42 | #include <linux/kernel.h> |
| 43 | #include <linux/errno.h> |
| 44 | #include <linux/init.h> |
| 45 | #include <linux/if_arp.h> |
| 46 | #include <linux/skbuff.h> |
| 47 | #include <linux/route.h> |
| 48 | #include <linux/netdevice.h> |
| 49 | #include <linux/inetdevice.h> |
| 50 | #include <linux/random.h> |
| 51 | #include <linux/pkt_sched.h> |
| 52 | #include <linux/spinlock.h> |
| 53 | #include <linux/rcupdate.h> |
| 54 | |
| 55 | #include <net/syncppp.h> |
| 56 | |
| 57 | #include <asm/byteorder.h> |
| 58 | #include <asm/uaccess.h> |
| 59 | |
| 60 | #define MAXALIVECNT 6 /* max. alive packets */ |
| 61 | |
| 62 | #define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */ |
| 63 | #define PPP_UI 0x03 /* Unnumbered Information */ |
| 64 | #define PPP_IP 0x0021 /* Internet Protocol */ |
| 65 | #define PPP_ISO 0x0023 /* ISO OSI Protocol */ |
| 66 | #define PPP_XNS 0x0025 /* Xerox NS Protocol */ |
| 67 | #define PPP_IPX 0x002b /* Novell IPX Protocol */ |
| 68 | #define PPP_LCP 0xc021 /* Link Control Protocol */ |
| 69 | #define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */ |
| 70 | |
| 71 | #define LCP_CONF_REQ 1 /* PPP LCP configure request */ |
| 72 | #define LCP_CONF_ACK 2 /* PPP LCP configure acknowledge */ |
| 73 | #define LCP_CONF_NAK 3 /* PPP LCP configure negative ack */ |
| 74 | #define LCP_CONF_REJ 4 /* PPP LCP configure reject */ |
| 75 | #define LCP_TERM_REQ 5 /* PPP LCP terminate request */ |
| 76 | #define LCP_TERM_ACK 6 /* PPP LCP terminate acknowledge */ |
| 77 | #define LCP_CODE_REJ 7 /* PPP LCP code reject */ |
| 78 | #define LCP_PROTO_REJ 8 /* PPP LCP protocol reject */ |
| 79 | #define LCP_ECHO_REQ 9 /* PPP LCP echo request */ |
| 80 | #define LCP_ECHO_REPLY 10 /* PPP LCP echo reply */ |
| 81 | #define LCP_DISC_REQ 11 /* PPP LCP discard request */ |
| 82 | |
| 83 | #define LCP_OPT_MRU 1 /* maximum receive unit */ |
| 84 | #define LCP_OPT_ASYNC_MAP 2 /* async control character map */ |
| 85 | #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */ |
| 86 | #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */ |
| 87 | #define LCP_OPT_MAGIC 5 /* magic number */ |
| 88 | #define LCP_OPT_RESERVED 6 /* reserved */ |
| 89 | #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */ |
| 90 | #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */ |
| 91 | |
| 92 | #define IPCP_CONF_REQ LCP_CONF_REQ /* PPP IPCP configure request */ |
| 93 | #define IPCP_CONF_ACK LCP_CONF_ACK /* PPP IPCP configure acknowledge */ |
| 94 | #define IPCP_CONF_NAK LCP_CONF_NAK /* PPP IPCP configure negative ack */ |
| 95 | #define IPCP_CONF_REJ LCP_CONF_REJ /* PPP IPCP configure reject */ |
| 96 | #define IPCP_TERM_REQ LCP_TERM_REQ /* PPP IPCP terminate request */ |
| 97 | #define IPCP_TERM_ACK LCP_TERM_ACK /* PPP IPCP terminate acknowledge */ |
| 98 | #define IPCP_CODE_REJ LCP_CODE_REJ /* PPP IPCP code reject */ |
| 99 | |
| 100 | #define CISCO_MULTICAST 0x8f /* Cisco multicast address */ |
| 101 | #define CISCO_UNICAST 0x0f /* Cisco unicast address */ |
| 102 | #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */ |
| 103 | #define CISCO_ADDR_REQ 0 /* Cisco address request */ |
| 104 | #define CISCO_ADDR_REPLY 1 /* Cisco address reply */ |
| 105 | #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */ |
| 106 | |
| 107 | struct ppp_header { |
| 108 | u8 address; |
| 109 | u8 control; |
| 110 | u16 protocol; |
| 111 | }; |
| 112 | #define PPP_HEADER_LEN sizeof (struct ppp_header) |
| 113 | |
| 114 | struct lcp_header { |
| 115 | u8 type; |
| 116 | u8 ident; |
| 117 | u16 len; |
| 118 | }; |
| 119 | #define LCP_HEADER_LEN sizeof (struct lcp_header) |
| 120 | |
| 121 | struct cisco_packet { |
| 122 | u32 type; |
| 123 | u32 par1; |
| 124 | u32 par2; |
| 125 | u16 rel; |
| 126 | u16 time0; |
| 127 | u16 time1; |
| 128 | }; |
| 129 | #define CISCO_PACKET_LEN 18 |
| 130 | #define CISCO_BIG_PACKET_LEN 20 |
| 131 | |
| 132 | static struct sppp *spppq; |
| 133 | static struct timer_list sppp_keepalive_timer; |
| 134 | static DEFINE_SPINLOCK(spppq_lock); |
| 135 | |
| 136 | /* global xmit queue for sending packets while spinlock is held */ |
| 137 | static struct sk_buff_head tx_queue; |
| 138 | |
| 139 | static void sppp_keepalive (unsigned long dummy); |
| 140 | static void sppp_cp_send (struct sppp *sp, u16 proto, u8 type, |
| 141 | u8 ident, u16 len, void *data); |
| 142 | static void sppp_cisco_send (struct sppp *sp, int type, long par1, long par2); |
| 143 | static void sppp_lcp_input (struct sppp *sp, struct sk_buff *m); |
| 144 | static void sppp_cisco_input (struct sppp *sp, struct sk_buff *m); |
| 145 | static void sppp_ipcp_input (struct sppp *sp, struct sk_buff *m); |
| 146 | static void sppp_lcp_open (struct sppp *sp); |
| 147 | static void sppp_ipcp_open (struct sppp *sp); |
| 148 | static int sppp_lcp_conf_parse_options (struct sppp *sp, struct lcp_header *h, |
| 149 | int len, u32 *magic); |
| 150 | static void sppp_cp_timeout (unsigned long arg); |
| 151 | static char *sppp_lcp_type_name (u8 type); |
| 152 | static char *sppp_ipcp_type_name (u8 type); |
| 153 | static void sppp_print_bytes (u8 *p, u16 len); |
| 154 | |
| 155 | static int debug; |
| 156 | |
| 157 | /* Flush global outgoing packet queue to dev_queue_xmit(). |
| 158 | * |
| 159 | * dev_queue_xmit() must be called with interrupts enabled |
| 160 | * which means it can't be called with spinlocks held. |
| 161 | * If a packet needs to be sent while a spinlock is held, |
| 162 | * then put the packet into tx_queue, and call sppp_flush_xmit() |
| 163 | * after spinlock is released. |
| 164 | */ |
| 165 | static void sppp_flush_xmit(void) |
| 166 | { |
| 167 | struct sk_buff *skb; |
| 168 | while ((skb = skb_dequeue(&tx_queue)) != NULL) |
| 169 | dev_queue_xmit(skb); |
| 170 | } |
| 171 | |
| 172 | /* |
| 173 | * Interface down stub |
| 174 | */ |
| 175 | |
| 176 | static void if_down(struct net_device *dev) |
| 177 | { |
| 178 | struct sppp *sp = (struct sppp *)sppp_of(dev); |
| 179 | |
| 180 | sp->pp_link_state=SPPP_LINK_DOWN; |
| 181 | } |
| 182 | |
| 183 | /* |
| 184 | * Timeout routine activations. |
| 185 | */ |
| 186 | |
| 187 | static void sppp_set_timeout(struct sppp *p,int s) |
| 188 | { |
| 189 | if (! (p->pp_flags & PP_TIMO)) |
| 190 | { |
| 191 | init_timer(&p->pp_timer); |
| 192 | p->pp_timer.function=sppp_cp_timeout; |
| 193 | p->pp_timer.expires=jiffies+s*HZ; |
| 194 | p->pp_timer.data=(unsigned long)p; |
| 195 | p->pp_flags |= PP_TIMO; |
| 196 | add_timer(&p->pp_timer); |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | static void sppp_clear_timeout(struct sppp *p) |
| 201 | { |
| 202 | if (p->pp_flags & PP_TIMO) |
| 203 | { |
| 204 | del_timer(&p->pp_timer); |
| 205 | p->pp_flags &= ~PP_TIMO; |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * sppp_input - receive and process a WAN PPP frame |
| 211 | * @skb: The buffer to process |
| 212 | * @dev: The device it arrived on |
| 213 | * |
| 214 | * This can be called directly by cards that do not have |
| 215 | * timing constraints but is normally called from the network layer |
| 216 | * after interrupt servicing to process frames queued via netif_rx(). |
| 217 | * |
| 218 | * We process the options in the card. If the frame is destined for |
| 219 | * the protocol stacks then it requeues the frame for the upper level |
| 220 | * protocol. If it is a control from it is processed and discarded |
| 221 | * here. |
| 222 | */ |
| 223 | |
| 224 | void sppp_input (struct net_device *dev, struct sk_buff *skb) |
| 225 | { |
| 226 | struct ppp_header *h; |
| 227 | struct sppp *sp = (struct sppp *)sppp_of(dev); |
| 228 | unsigned long flags; |
| 229 | |
| 230 | skb->dev=dev; |
| 231 | skb->mac.raw=skb->data; |
| 232 | |
| 233 | if (dev->flags & IFF_RUNNING) |
| 234 | { |
| 235 | /* Count received bytes, add FCS and one flag */ |
| 236 | sp->ibytes+= skb->len + 3; |
| 237 | sp->ipkts++; |
| 238 | } |
| 239 | |
| 240 | if (!pskb_may_pull(skb, PPP_HEADER_LEN)) { |
| 241 | /* Too small packet, drop it. */ |
| 242 | if (sp->pp_flags & PP_DEBUG) |
| 243 | printk (KERN_DEBUG "%s: input packet is too small, %d bytes\n", |
| 244 | dev->name, skb->len); |
| 245 | kfree_skb(skb); |
| 246 | return; |
| 247 | } |
| 248 | |
| 249 | /* Get PPP header. */ |
| 250 | h = (struct ppp_header *)skb->data; |
| 251 | skb_pull(skb,sizeof(struct ppp_header)); |
| 252 | |
| 253 | spin_lock_irqsave(&sp->lock, flags); |
| 254 | |
| 255 | switch (h->address) { |
| 256 | default: /* Invalid PPP packet. */ |
| 257 | goto invalid; |
| 258 | case PPP_ALLSTATIONS: |
| 259 | if (h->control != PPP_UI) |
| 260 | goto invalid; |
| 261 | if (sp->pp_flags & PP_CISCO) { |
| 262 | if (sp->pp_flags & PP_DEBUG) |
| 263 | printk (KERN_WARNING "%s: PPP packet in Cisco mode <0x%x 0x%x 0x%x>\n", |
| 264 | dev->name, |
| 265 | h->address, h->control, ntohs (h->protocol)); |
| 266 | goto drop; |
| 267 | } |
| 268 | switch (ntohs (h->protocol)) { |
| 269 | default: |
| 270 | if (sp->lcp.state == LCP_STATE_OPENED) |
| 271 | sppp_cp_send (sp, PPP_LCP, LCP_PROTO_REJ, |
| 272 | ++sp->pp_seq, skb->len + 2, |
| 273 | &h->protocol); |
| 274 | if (sp->pp_flags & PP_DEBUG) |
| 275 | printk (KERN_WARNING "%s: invalid input protocol <0x%x 0x%x 0x%x>\n", |
| 276 | dev->name, |
| 277 | h->address, h->control, ntohs (h->protocol)); |
| 278 | goto drop; |
| 279 | case PPP_LCP: |
| 280 | sppp_lcp_input (sp, skb); |
| 281 | goto drop; |
| 282 | case PPP_IPCP: |
| 283 | if (sp->lcp.state == LCP_STATE_OPENED) |
| 284 | sppp_ipcp_input (sp, skb); |
| 285 | else |
| 286 | printk(KERN_DEBUG "IPCP when still waiting LCP finish.\n"); |
| 287 | goto drop; |
| 288 | case PPP_IP: |
| 289 | if (sp->ipcp.state == IPCP_STATE_OPENED) { |
| 290 | if(sp->pp_flags&PP_DEBUG) |
| 291 | printk(KERN_DEBUG "Yow an IP frame.\n"); |
| 292 | skb->protocol=htons(ETH_P_IP); |
| 293 | netif_rx(skb); |
| 294 | dev->last_rx = jiffies; |
| 295 | goto done; |
| 296 | } |
| 297 | break; |
| 298 | #ifdef IPX |
| 299 | case PPP_IPX: |
| 300 | /* IPX IPXCP not implemented yet */ |
| 301 | if (sp->lcp.state == LCP_STATE_OPENED) { |
| 302 | skb->protocol=htons(ETH_P_IPX); |
| 303 | netif_rx(skb); |
| 304 | dev->last_rx = jiffies; |
| 305 | goto done; |
| 306 | } |
| 307 | break; |
| 308 | #endif |
| 309 | } |
| 310 | break; |
| 311 | case CISCO_MULTICAST: |
| 312 | case CISCO_UNICAST: |
| 313 | /* Don't check the control field here (RFC 1547). */ |
| 314 | if (! (sp->pp_flags & PP_CISCO)) { |
| 315 | if (sp->pp_flags & PP_DEBUG) |
| 316 | printk (KERN_WARNING "%s: Cisco packet in PPP mode <0x%x 0x%x 0x%x>\n", |
| 317 | dev->name, |
| 318 | h->address, h->control, ntohs (h->protocol)); |
| 319 | goto drop; |
| 320 | } |
| 321 | switch (ntohs (h->protocol)) { |
| 322 | default: |
| 323 | goto invalid; |
| 324 | case CISCO_KEEPALIVE: |
| 325 | sppp_cisco_input (sp, skb); |
| 326 | goto drop; |
| 327 | #ifdef CONFIG_INET |
| 328 | case ETH_P_IP: |
| 329 | skb->protocol=htons(ETH_P_IP); |
| 330 | netif_rx(skb); |
| 331 | dev->last_rx = jiffies; |
| 332 | goto done; |
| 333 | #endif |
| 334 | #ifdef CONFIG_IPX |
| 335 | case ETH_P_IPX: |
| 336 | skb->protocol=htons(ETH_P_IPX); |
| 337 | netif_rx(skb); |
| 338 | dev->last_rx = jiffies; |
| 339 | goto done; |
| 340 | #endif |
| 341 | } |
| 342 | break; |
| 343 | } |
| 344 | goto drop; |
| 345 | |
| 346 | invalid: |
| 347 | if (sp->pp_flags & PP_DEBUG) |
| 348 | printk (KERN_WARNING "%s: invalid input packet <0x%x 0x%x 0x%x>\n", |
| 349 | dev->name, h->address, h->control, ntohs (h->protocol)); |
| 350 | drop: |
| 351 | kfree_skb(skb); |
| 352 | done: |
| 353 | spin_unlock_irqrestore(&sp->lock, flags); |
| 354 | sppp_flush_xmit(); |
| 355 | return; |
| 356 | } |
| 357 | |
| 358 | EXPORT_SYMBOL(sppp_input); |
| 359 | |
| 360 | /* |
| 361 | * Handle transmit packets. |
| 362 | */ |
| 363 | |
| 364 | static int sppp_hard_header(struct sk_buff *skb, struct net_device *dev, __u16 type, |
| 365 | void *daddr, void *saddr, unsigned int len) |
| 366 | { |
| 367 | struct sppp *sp = (struct sppp *)sppp_of(dev); |
| 368 | struct ppp_header *h; |
| 369 | skb_push(skb,sizeof(struct ppp_header)); |
| 370 | h=(struct ppp_header *)skb->data; |
| 371 | if(sp->pp_flags&PP_CISCO) |
| 372 | { |
| 373 | h->address = CISCO_UNICAST; |
| 374 | h->control = 0; |
| 375 | } |
| 376 | else |
| 377 | { |
| 378 | h->address = PPP_ALLSTATIONS; |
| 379 | h->control = PPP_UI; |
| 380 | } |
| 381 | if(sp->pp_flags & PP_CISCO) |
| 382 | { |
| 383 | h->protocol = htons(type); |
| 384 | } |
| 385 | else switch(type) |
| 386 | { |
| 387 | case ETH_P_IP: |
| 388 | h->protocol = htons(PPP_IP); |
| 389 | break; |
| 390 | case ETH_P_IPX: |
| 391 | h->protocol = htons(PPP_IPX); |
| 392 | break; |
| 393 | } |
| 394 | return sizeof(struct ppp_header); |
| 395 | } |
| 396 | |
| 397 | static int sppp_rebuild_header(struct sk_buff *skb) |
| 398 | { |
| 399 | return 0; |
| 400 | } |
| 401 | |
| 402 | /* |
| 403 | * Send keepalive packets, every 10 seconds. |
| 404 | */ |
| 405 | |
| 406 | static void sppp_keepalive (unsigned long dummy) |
| 407 | { |
| 408 | struct sppp *sp; |
| 409 | unsigned long flags; |
| 410 | |
| 411 | spin_lock_irqsave(&spppq_lock, flags); |
| 412 | |
| 413 | for (sp=spppq; sp; sp=sp->pp_next) |
| 414 | { |
| 415 | struct net_device *dev = sp->pp_if; |
| 416 | |
| 417 | /* Keepalive mode disabled or channel down? */ |
| 418 | if (! (sp->pp_flags & PP_KEEPALIVE) || |
| 419 | ! (dev->flags & IFF_UP)) |
| 420 | continue; |
| 421 | |
| 422 | spin_lock(&sp->lock); |
| 423 | |
| 424 | /* No keepalive in PPP mode if LCP not opened yet. */ |
| 425 | if (! (sp->pp_flags & PP_CISCO) && |
| 426 | sp->lcp.state != LCP_STATE_OPENED) { |
| 427 | spin_unlock(&sp->lock); |
| 428 | continue; |
| 429 | } |
| 430 | |
| 431 | if (sp->pp_alivecnt == MAXALIVECNT) { |
| 432 | /* No keepalive packets got. Stop the interface. */ |
| 433 | printk (KERN_WARNING "%s: protocol down\n", dev->name); |
| 434 | if_down (dev); |
| 435 | if (! (sp->pp_flags & PP_CISCO)) { |
| 436 | /* Shut down the PPP link. */ |
| 437 | sp->lcp.magic = jiffies; |
| 438 | sp->lcp.state = LCP_STATE_CLOSED; |
| 439 | sp->ipcp.state = IPCP_STATE_CLOSED; |
| 440 | sppp_clear_timeout (sp); |
| 441 | /* Initiate negotiation. */ |
| 442 | sppp_lcp_open (sp); |
| 443 | } |
| 444 | } |
| 445 | if (sp->pp_alivecnt <= MAXALIVECNT) |
| 446 | ++sp->pp_alivecnt; |
| 447 | if (sp->pp_flags & PP_CISCO) |
| 448 | sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, ++sp->pp_seq, |
| 449 | sp->pp_rseq); |
| 450 | else if (sp->lcp.state == LCP_STATE_OPENED) { |
| 451 | long nmagic = htonl (sp->lcp.magic); |
| 452 | sp->lcp.echoid = ++sp->pp_seq; |
| 453 | sppp_cp_send (sp, PPP_LCP, LCP_ECHO_REQ, |
| 454 | sp->lcp.echoid, 4, &nmagic); |
| 455 | } |
| 456 | |
| 457 | spin_unlock(&sp->lock); |
| 458 | } |
| 459 | spin_unlock_irqrestore(&spppq_lock, flags); |
| 460 | sppp_flush_xmit(); |
| 461 | sppp_keepalive_timer.expires=jiffies+10*HZ; |
| 462 | add_timer(&sppp_keepalive_timer); |
| 463 | } |
| 464 | |
| 465 | /* |
| 466 | * Handle incoming PPP Link Control Protocol packets. |
| 467 | */ |
| 468 | |
| 469 | static void sppp_lcp_input (struct sppp *sp, struct sk_buff *skb) |
| 470 | { |
| 471 | struct lcp_header *h; |
| 472 | struct net_device *dev = sp->pp_if; |
| 473 | int len = skb->len; |
| 474 | u8 *p, opt[6]; |
| 475 | u32 rmagic; |
| 476 | |
| 477 | if (!pskb_may_pull(skb, sizeof(struct lcp_header))) { |
| 478 | if (sp->pp_flags & PP_DEBUG) |
| 479 | printk (KERN_WARNING "%s: invalid lcp packet length: %d bytes\n", |
| 480 | dev->name, len); |
| 481 | return; |
| 482 | } |
| 483 | h = (struct lcp_header *)skb->data; |
| 484 | skb_pull(skb,sizeof(struct lcp_header *)); |
| 485 | |
| 486 | if (sp->pp_flags & PP_DEBUG) |
| 487 | { |
| 488 | char state = '?'; |
| 489 | switch (sp->lcp.state) { |
| 490 | case LCP_STATE_CLOSED: state = 'C'; break; |
| 491 | case LCP_STATE_ACK_RCVD: state = 'R'; break; |
| 492 | case LCP_STATE_ACK_SENT: state = 'S'; break; |
| 493 | case LCP_STATE_OPENED: state = 'O'; break; |
| 494 | } |
| 495 | printk (KERN_WARNING "%s: lcp input(%c): %d bytes <%s id=%xh len=%xh", |
| 496 | dev->name, state, len, |
| 497 | sppp_lcp_type_name (h->type), h->ident, ntohs (h->len)); |
| 498 | if (len > 4) |
| 499 | sppp_print_bytes ((u8*) (h+1), len-4); |
| 500 | printk (">\n"); |
| 501 | } |
| 502 | if (len > ntohs (h->len)) |
| 503 | len = ntohs (h->len); |
| 504 | switch (h->type) { |
| 505 | default: |
| 506 | /* Unknown packet type -- send Code-Reject packet. */ |
| 507 | sppp_cp_send (sp, PPP_LCP, LCP_CODE_REJ, ++sp->pp_seq, |
| 508 | skb->len, h); |
| 509 | break; |
| 510 | case LCP_CONF_REQ: |
| 511 | if (len < 4) { |
| 512 | if (sp->pp_flags & PP_DEBUG) |
| 513 | printk (KERN_DEBUG"%s: invalid lcp configure request packet length: %d bytes\n", |
| 514 | dev->name, len); |
| 515 | break; |
| 516 | } |
| 517 | if (len>4 && !sppp_lcp_conf_parse_options (sp, h, len, &rmagic)) |
| 518 | goto badreq; |
| 519 | if (rmagic == sp->lcp.magic) { |
| 520 | /* Local and remote magics equal -- loopback? */ |
| 521 | if (sp->pp_loopcnt >= MAXALIVECNT*5) { |
| 522 | printk (KERN_WARNING "%s: loopback\n", |
| 523 | dev->name); |
| 524 | sp->pp_loopcnt = 0; |
| 525 | if (dev->flags & IFF_UP) { |
| 526 | if_down (dev); |
| 527 | } |
| 528 | } else if (sp->pp_flags & PP_DEBUG) |
| 529 | printk (KERN_DEBUG "%s: conf req: magic glitch\n", |
| 530 | dev->name); |
| 531 | ++sp->pp_loopcnt; |
| 532 | |
| 533 | /* MUST send Conf-Nack packet. */ |
| 534 | rmagic = ~sp->lcp.magic; |
| 535 | opt[0] = LCP_OPT_MAGIC; |
| 536 | opt[1] = sizeof (opt); |
| 537 | opt[2] = rmagic >> 24; |
| 538 | opt[3] = rmagic >> 16; |
| 539 | opt[4] = rmagic >> 8; |
| 540 | opt[5] = rmagic; |
| 541 | sppp_cp_send (sp, PPP_LCP, LCP_CONF_NAK, |
| 542 | h->ident, sizeof (opt), &opt); |
| 543 | badreq: |
| 544 | switch (sp->lcp.state) { |
| 545 | case LCP_STATE_OPENED: |
| 546 | /* Initiate renegotiation. */ |
| 547 | sppp_lcp_open (sp); |
| 548 | /* fall through... */ |
| 549 | case LCP_STATE_ACK_SENT: |
| 550 | /* Go to closed state. */ |
| 551 | sp->lcp.state = LCP_STATE_CLOSED; |
| 552 | sp->ipcp.state = IPCP_STATE_CLOSED; |
| 553 | } |
| 554 | break; |
| 555 | } |
| 556 | /* Send Configure-Ack packet. */ |
| 557 | sp->pp_loopcnt = 0; |
| 558 | if (sp->lcp.state != LCP_STATE_OPENED) { |
| 559 | sppp_cp_send (sp, PPP_LCP, LCP_CONF_ACK, |
| 560 | h->ident, len-4, h+1); |
| 561 | } |
| 562 | /* Change the state. */ |
| 563 | switch (sp->lcp.state) { |
| 564 | case LCP_STATE_CLOSED: |
| 565 | sp->lcp.state = LCP_STATE_ACK_SENT; |
| 566 | break; |
| 567 | case LCP_STATE_ACK_RCVD: |
| 568 | sp->lcp.state = LCP_STATE_OPENED; |
| 569 | sppp_ipcp_open (sp); |
| 570 | break; |
| 571 | case LCP_STATE_OPENED: |
| 572 | /* Remote magic changed -- close session. */ |
| 573 | sp->lcp.state = LCP_STATE_CLOSED; |
| 574 | sp->ipcp.state = IPCP_STATE_CLOSED; |
| 575 | /* Initiate renegotiation. */ |
| 576 | sppp_lcp_open (sp); |
| 577 | /* Send ACK after our REQ in attempt to break loop */ |
| 578 | sppp_cp_send (sp, PPP_LCP, LCP_CONF_ACK, |
| 579 | h->ident, len-4, h+1); |
| 580 | sp->lcp.state = LCP_STATE_ACK_SENT; |
| 581 | break; |
| 582 | } |
| 583 | break; |
| 584 | case LCP_CONF_ACK: |
| 585 | if (h->ident != sp->lcp.confid) |
| 586 | break; |
| 587 | sppp_clear_timeout (sp); |
| 588 | if ((sp->pp_link_state != SPPP_LINK_UP) && |
| 589 | (dev->flags & IFF_UP)) { |
| 590 | /* Coming out of loopback mode. */ |
| 591 | sp->pp_link_state=SPPP_LINK_UP; |
| 592 | printk (KERN_INFO "%s: protocol up\n", dev->name); |
| 593 | } |
| 594 | switch (sp->lcp.state) { |
| 595 | case LCP_STATE_CLOSED: |
| 596 | sp->lcp.state = LCP_STATE_ACK_RCVD; |
| 597 | sppp_set_timeout (sp, 5); |
| 598 | break; |
| 599 | case LCP_STATE_ACK_SENT: |
| 600 | sp->lcp.state = LCP_STATE_OPENED; |
| 601 | sppp_ipcp_open (sp); |
| 602 | break; |
| 603 | } |
| 604 | break; |
| 605 | case LCP_CONF_NAK: |
| 606 | if (h->ident != sp->lcp.confid) |
| 607 | break; |
| 608 | p = (u8*) (h+1); |
| 609 | if (len>=10 && p[0] == LCP_OPT_MAGIC && p[1] >= 4) { |
| 610 | rmagic = (u32)p[2] << 24 | |
| 611 | (u32)p[3] << 16 | p[4] << 8 | p[5]; |
| 612 | if (rmagic == ~sp->lcp.magic) { |
| 613 | int newmagic; |
| 614 | if (sp->pp_flags & PP_DEBUG) |
| 615 | printk (KERN_DEBUG "%s: conf nak: magic glitch\n", |
| 616 | dev->name); |
| 617 | get_random_bytes(&newmagic, sizeof(newmagic)); |
| 618 | sp->lcp.magic += newmagic; |
| 619 | } else |
| 620 | sp->lcp.magic = rmagic; |
| 621 | } |
| 622 | if (sp->lcp.state != LCP_STATE_ACK_SENT) { |
| 623 | /* Go to closed state. */ |
| 624 | sp->lcp.state = LCP_STATE_CLOSED; |
| 625 | sp->ipcp.state = IPCP_STATE_CLOSED; |
| 626 | } |
| 627 | /* The link will be renegotiated after timeout, |
| 628 | * to avoid endless req-nack loop. */ |
| 629 | sppp_clear_timeout (sp); |
| 630 | sppp_set_timeout (sp, 2); |
| 631 | break; |
| 632 | case LCP_CONF_REJ: |
| 633 | if (h->ident != sp->lcp.confid) |
| 634 | break; |
| 635 | sppp_clear_timeout (sp); |
| 636 | /* Initiate renegotiation. */ |
| 637 | sppp_lcp_open (sp); |
| 638 | if (sp->lcp.state != LCP_STATE_ACK_SENT) { |
| 639 | /* Go to closed state. */ |
| 640 | sp->lcp.state = LCP_STATE_CLOSED; |
| 641 | sp->ipcp.state = IPCP_STATE_CLOSED; |
| 642 | } |
| 643 | break; |
| 644 | case LCP_TERM_REQ: |
| 645 | sppp_clear_timeout (sp); |
| 646 | /* Send Terminate-Ack packet. */ |
| 647 | sppp_cp_send (sp, PPP_LCP, LCP_TERM_ACK, h->ident, 0, NULL); |
| 648 | /* Go to closed state. */ |
| 649 | sp->lcp.state = LCP_STATE_CLOSED; |
| 650 | sp->ipcp.state = IPCP_STATE_CLOSED; |
| 651 | /* Initiate renegotiation. */ |
| 652 | sppp_lcp_open (sp); |
| 653 | break; |
| 654 | case LCP_TERM_ACK: |
| 655 | case LCP_CODE_REJ: |
| 656 | case LCP_PROTO_REJ: |
| 657 | /* Ignore for now. */ |
| 658 | break; |
| 659 | case LCP_DISC_REQ: |
| 660 | /* Discard the packet. */ |
| 661 | break; |
| 662 | case LCP_ECHO_REQ: |
| 663 | if (sp->lcp.state != LCP_STATE_OPENED) |
| 664 | break; |
| 665 | if (len < 8) { |
| 666 | if (sp->pp_flags & PP_DEBUG) |
| 667 | printk (KERN_WARNING "%s: invalid lcp echo request packet length: %d bytes\n", |
| 668 | dev->name, len); |
| 669 | break; |
| 670 | } |
| 671 | if (ntohl (*(long*)(h+1)) == sp->lcp.magic) { |
| 672 | /* Line loopback mode detected. */ |
| 673 | printk (KERN_WARNING "%s: loopback\n", dev->name); |
| 674 | if_down (dev); |
| 675 | |
| 676 | /* Shut down the PPP link. */ |
| 677 | sp->lcp.state = LCP_STATE_CLOSED; |
| 678 | sp->ipcp.state = IPCP_STATE_CLOSED; |
| 679 | sppp_clear_timeout (sp); |
| 680 | /* Initiate negotiation. */ |
| 681 | sppp_lcp_open (sp); |
| 682 | break; |
| 683 | } |
| 684 | *(long*)(h+1) = htonl (sp->lcp.magic); |
| 685 | sppp_cp_send (sp, PPP_LCP, LCP_ECHO_REPLY, h->ident, len-4, h+1); |
| 686 | break; |
| 687 | case LCP_ECHO_REPLY: |
| 688 | if (h->ident != sp->lcp.echoid) |
| 689 | break; |
| 690 | if (len < 8) { |
| 691 | if (sp->pp_flags & PP_DEBUG) |
| 692 | printk (KERN_WARNING "%s: invalid lcp echo reply packet length: %d bytes\n", |
| 693 | dev->name, len); |
| 694 | break; |
| 695 | } |
| 696 | if (ntohl (*(long*)(h+1)) != sp->lcp.magic) |
| 697 | sp->pp_alivecnt = 0; |
| 698 | break; |
| 699 | } |
| 700 | } |
| 701 | |
| 702 | /* |
| 703 | * Handle incoming Cisco keepalive protocol packets. |
| 704 | */ |
| 705 | |
| 706 | static void sppp_cisco_input (struct sppp *sp, struct sk_buff *skb) |
| 707 | { |
| 708 | struct cisco_packet *h; |
| 709 | struct net_device *dev = sp->pp_if; |
| 710 | |
| 711 | if (!pskb_may_pull(skb, sizeof(struct cisco_packet)) |
| 712 | || (skb->len != CISCO_PACKET_LEN |
| 713 | && skb->len != CISCO_BIG_PACKET_LEN)) { |
| 714 | if (sp->pp_flags & PP_DEBUG) |
| 715 | printk (KERN_WARNING "%s: invalid cisco packet length: %d bytes\n", |
| 716 | dev->name, skb->len); |
| 717 | return; |
| 718 | } |
| 719 | h = (struct cisco_packet *)skb->data; |
| 720 | skb_pull(skb, sizeof(struct cisco_packet*)); |
| 721 | if (sp->pp_flags & PP_DEBUG) |
| 722 | printk (KERN_WARNING "%s: cisco input: %d bytes <%xh %xh %xh %xh %xh-%xh>\n", |
| 723 | dev->name, skb->len, |
| 724 | ntohl (h->type), h->par1, h->par2, h->rel, |
| 725 | h->time0, h->time1); |
| 726 | switch (ntohl (h->type)) { |
| 727 | default: |
| 728 | if (sp->pp_flags & PP_DEBUG) |
| 729 | printk (KERN_WARNING "%s: unknown cisco packet type: 0x%x\n", |
| 730 | dev->name, ntohl (h->type)); |
| 731 | break; |
| 732 | case CISCO_ADDR_REPLY: |
| 733 | /* Reply on address request, ignore */ |
| 734 | break; |
| 735 | case CISCO_KEEPALIVE_REQ: |
| 736 | sp->pp_alivecnt = 0; |
| 737 | sp->pp_rseq = ntohl (h->par1); |
| 738 | if (sp->pp_seq == sp->pp_rseq) { |
| 739 | /* Local and remote sequence numbers are equal. |
| 740 | * Probably, the line is in loopback mode. */ |
| 741 | int newseq; |
| 742 | if (sp->pp_loopcnt >= MAXALIVECNT) { |
| 743 | printk (KERN_WARNING "%s: loopback\n", |
| 744 | dev->name); |
| 745 | sp->pp_loopcnt = 0; |
| 746 | if (dev->flags & IFF_UP) { |
| 747 | if_down (dev); |
| 748 | } |
| 749 | } |
| 750 | ++sp->pp_loopcnt; |
| 751 | |
| 752 | /* Generate new local sequence number */ |
| 753 | get_random_bytes(&newseq, sizeof(newseq)); |
| 754 | sp->pp_seq ^= newseq; |
| 755 | break; |
| 756 | } |
| 757 | sp->pp_loopcnt = 0; |
| 758 | if (sp->pp_link_state==SPPP_LINK_DOWN && |
| 759 | (dev->flags & IFF_UP)) { |
| 760 | sp->pp_link_state=SPPP_LINK_UP; |
| 761 | printk (KERN_INFO "%s: protocol up\n", dev->name); |
| 762 | } |
| 763 | break; |
| 764 | case CISCO_ADDR_REQ: |
| 765 | /* Stolen from net/ipv4/devinet.c -- SIOCGIFADDR ioctl */ |
| 766 | { |
| 767 | struct in_device *in_dev; |
| 768 | struct in_ifaddr *ifa; |
| 769 | u32 addr = 0, mask = ~0; /* FIXME: is the mask correct? */ |
| 770 | #ifdef CONFIG_INET |
| 771 | rcu_read_lock(); |
| 772 | if ((in_dev = __in_dev_get(dev)) != NULL) |
| 773 | { |
| 774 | for (ifa=in_dev->ifa_list; ifa != NULL; |
| 775 | ifa=ifa->ifa_next) { |
| 776 | if (strcmp(dev->name, ifa->ifa_label) == 0) |
| 777 | { |
| 778 | addr = ifa->ifa_local; |
| 779 | mask = ifa->ifa_mask; |
| 780 | break; |
| 781 | } |
| 782 | } |
| 783 | } |
| 784 | rcu_read_unlock(); |
| 785 | #endif |
| 786 | /* I hope both addr and mask are in the net order */ |
| 787 | sppp_cisco_send (sp, CISCO_ADDR_REPLY, addr, mask); |
| 788 | break; |
| 789 | } |
| 790 | } |
| 791 | } |
| 792 | |
| 793 | |
| 794 | /* |
| 795 | * Send PPP LCP packet. |
| 796 | */ |
| 797 | |
| 798 | static void sppp_cp_send (struct sppp *sp, u16 proto, u8 type, |
| 799 | u8 ident, u16 len, void *data) |
| 800 | { |
| 801 | struct ppp_header *h; |
| 802 | struct lcp_header *lh; |
| 803 | struct sk_buff *skb; |
| 804 | struct net_device *dev = sp->pp_if; |
| 805 | |
| 806 | skb=alloc_skb(dev->hard_header_len+PPP_HEADER_LEN+LCP_HEADER_LEN+len, |
| 807 | GFP_ATOMIC); |
| 808 | if (skb==NULL) |
| 809 | return; |
| 810 | |
| 811 | skb_reserve(skb,dev->hard_header_len); |
| 812 | |
| 813 | h = (struct ppp_header *)skb_put(skb, sizeof(struct ppp_header)); |
| 814 | h->address = PPP_ALLSTATIONS; /* broadcast address */ |
| 815 | h->control = PPP_UI; /* Unnumbered Info */ |
| 816 | h->protocol = htons (proto); /* Link Control Protocol */ |
| 817 | |
| 818 | lh = (struct lcp_header *)skb_put(skb, sizeof(struct lcp_header)); |
| 819 | lh->type = type; |
| 820 | lh->ident = ident; |
| 821 | lh->len = htons (LCP_HEADER_LEN + len); |
| 822 | |
| 823 | if (len) |
| 824 | memcpy(skb_put(skb,len),data, len); |
| 825 | |
| 826 | if (sp->pp_flags & PP_DEBUG) { |
| 827 | printk (KERN_WARNING "%s: %s output <%s id=%xh len=%xh", |
| 828 | dev->name, |
| 829 | proto==PPP_LCP ? "lcp" : "ipcp", |
| 830 | proto==PPP_LCP ? sppp_lcp_type_name (lh->type) : |
| 831 | sppp_ipcp_type_name (lh->type), lh->ident, |
| 832 | ntohs (lh->len)); |
| 833 | if (len) |
| 834 | sppp_print_bytes ((u8*) (lh+1), len); |
| 835 | printk (">\n"); |
| 836 | } |
| 837 | sp->obytes += skb->len; |
| 838 | /* Control is high priority so it doesn't get queued behind data */ |
| 839 | skb->priority=TC_PRIO_CONTROL; |
| 840 | skb->dev = dev; |
| 841 | skb_queue_tail(&tx_queue, skb); |
| 842 | } |
| 843 | |
| 844 | /* |
| 845 | * Send Cisco keepalive packet. |
| 846 | */ |
| 847 | |
| 848 | static void sppp_cisco_send (struct sppp *sp, int type, long par1, long par2) |
| 849 | { |
| 850 | struct ppp_header *h; |
| 851 | struct cisco_packet *ch; |
| 852 | struct sk_buff *skb; |
| 853 | struct net_device *dev = sp->pp_if; |
| 854 | u32 t = jiffies * 1000/HZ; |
| 855 | |
| 856 | skb=alloc_skb(dev->hard_header_len+PPP_HEADER_LEN+CISCO_PACKET_LEN, |
| 857 | GFP_ATOMIC); |
| 858 | |
| 859 | if(skb==NULL) |
| 860 | return; |
| 861 | |
| 862 | skb_reserve(skb, dev->hard_header_len); |
| 863 | h = (struct ppp_header *)skb_put (skb, sizeof(struct ppp_header)); |
| 864 | h->address = CISCO_MULTICAST; |
| 865 | h->control = 0; |
| 866 | h->protocol = htons (CISCO_KEEPALIVE); |
| 867 | |
| 868 | ch = (struct cisco_packet*)skb_put(skb, CISCO_PACKET_LEN); |
| 869 | ch->type = htonl (type); |
| 870 | ch->par1 = htonl (par1); |
| 871 | ch->par2 = htonl (par2); |
| 872 | ch->rel = -1; |
| 873 | ch->time0 = htons ((u16) (t >> 16)); |
| 874 | ch->time1 = htons ((u16) t); |
| 875 | |
| 876 | if (sp->pp_flags & PP_DEBUG) |
| 877 | printk (KERN_WARNING "%s: cisco output: <%xh %xh %xh %xh %xh-%xh>\n", |
| 878 | dev->name, ntohl (ch->type), ch->par1, |
| 879 | ch->par2, ch->rel, ch->time0, ch->time1); |
| 880 | sp->obytes += skb->len; |
| 881 | skb->priority=TC_PRIO_CONTROL; |
| 882 | skb->dev = dev; |
| 883 | skb_queue_tail(&tx_queue, skb); |
| 884 | } |
| 885 | |
| 886 | /** |
| 887 | * sppp_close - close down a synchronous PPP or Cisco HDLC link |
| 888 | * @dev: The network device to drop the link of |
| 889 | * |
| 890 | * This drops the logical interface to the channel. It is not |
| 891 | * done politely as we assume we will also be dropping DTR. Any |
| 892 | * timeouts are killed. |
| 893 | */ |
| 894 | |
| 895 | int sppp_close (struct net_device *dev) |
| 896 | { |
| 897 | struct sppp *sp = (struct sppp *)sppp_of(dev); |
| 898 | unsigned long flags; |
| 899 | |
| 900 | spin_lock_irqsave(&sp->lock, flags); |
| 901 | sp->pp_link_state = SPPP_LINK_DOWN; |
| 902 | sp->lcp.state = LCP_STATE_CLOSED; |
| 903 | sp->ipcp.state = IPCP_STATE_CLOSED; |
| 904 | sppp_clear_timeout (sp); |
| 905 | spin_unlock_irqrestore(&sp->lock, flags); |
| 906 | |
| 907 | return 0; |
| 908 | } |
| 909 | |
| 910 | EXPORT_SYMBOL(sppp_close); |
| 911 | |
| 912 | /** |
| 913 | * sppp_open - open a synchronous PPP or Cisco HDLC link |
| 914 | * @dev: Network device to activate |
| 915 | * |
| 916 | * Close down any existing synchronous session and commence |
| 917 | * from scratch. In the PPP case this means negotiating LCP/IPCP |
| 918 | * and friends, while for Cisco HDLC we simply need to start sending |
| 919 | * keepalives |
| 920 | */ |
| 921 | |
| 922 | int sppp_open (struct net_device *dev) |
| 923 | { |
| 924 | struct sppp *sp = (struct sppp *)sppp_of(dev); |
| 925 | unsigned long flags; |
| 926 | |
| 927 | sppp_close(dev); |
| 928 | |
| 929 | spin_lock_irqsave(&sp->lock, flags); |
| 930 | if (!(sp->pp_flags & PP_CISCO)) { |
| 931 | sppp_lcp_open (sp); |
| 932 | } |
| 933 | sp->pp_link_state = SPPP_LINK_DOWN; |
| 934 | spin_unlock_irqrestore(&sp->lock, flags); |
| 935 | sppp_flush_xmit(); |
| 936 | |
| 937 | return 0; |
| 938 | } |
| 939 | |
| 940 | EXPORT_SYMBOL(sppp_open); |
| 941 | |
| 942 | /** |
| 943 | * sppp_reopen - notify of physical link loss |
| 944 | * @dev: Device that lost the link |
| 945 | * |
| 946 | * This function informs the synchronous protocol code that |
| 947 | * the underlying link died (for example a carrier drop on X.21) |
| 948 | * |
| 949 | * We increment the magic numbers to ensure that if the other end |
| 950 | * failed to notice we will correctly start a new session. It happens |
| 951 | * do to the nature of telco circuits is that you can lose carrier on |
| 952 | * one endonly. |
| 953 | * |
| 954 | * Having done this we go back to negotiating. This function may |
| 955 | * be called from an interrupt context. |
| 956 | */ |
| 957 | |
| 958 | int sppp_reopen (struct net_device *dev) |
| 959 | { |
| 960 | struct sppp *sp = (struct sppp *)sppp_of(dev); |
| 961 | unsigned long flags; |
| 962 | |
| 963 | sppp_close(dev); |
| 964 | |
| 965 | spin_lock_irqsave(&sp->lock, flags); |
| 966 | if (!(sp->pp_flags & PP_CISCO)) |
| 967 | { |
| 968 | sp->lcp.magic = jiffies; |
| 969 | ++sp->pp_seq; |
| 970 | sp->lcp.state = LCP_STATE_CLOSED; |
| 971 | sp->ipcp.state = IPCP_STATE_CLOSED; |
| 972 | /* Give it a moment for the line to settle then go */ |
| 973 | sppp_set_timeout (sp, 1); |
| 974 | } |
| 975 | sp->pp_link_state=SPPP_LINK_DOWN; |
| 976 | spin_unlock_irqrestore(&sp->lock, flags); |
| 977 | |
| 978 | return 0; |
| 979 | } |
| 980 | |
| 981 | EXPORT_SYMBOL(sppp_reopen); |
| 982 | |
| 983 | /** |
| 984 | * sppp_change_mtu - Change the link MTU |
| 985 | * @dev: Device to change MTU on |
| 986 | * @new_mtu: New MTU |
| 987 | * |
| 988 | * Change the MTU on the link. This can only be called with |
| 989 | * the link down. It returns an error if the link is up or |
| 990 | * the mtu is out of range. |
| 991 | */ |
| 992 | |
| 993 | int sppp_change_mtu(struct net_device *dev, int new_mtu) |
| 994 | { |
| 995 | if(new_mtu<128||new_mtu>PPP_MTU||(dev->flags&IFF_UP)) |
| 996 | return -EINVAL; |
| 997 | dev->mtu=new_mtu; |
| 998 | return 0; |
| 999 | } |
| 1000 | |
| 1001 | EXPORT_SYMBOL(sppp_change_mtu); |
| 1002 | |
| 1003 | /** |
| 1004 | * sppp_do_ioctl - Ioctl handler for ppp/hdlc |
| 1005 | * @dev: Device subject to ioctl |
| 1006 | * @ifr: Interface request block from the user |
| 1007 | * @cmd: Command that is being issued |
| 1008 | * |
| 1009 | * This function handles the ioctls that may be issued by the user |
| 1010 | * to control the settings of a PPP/HDLC link. It does both busy |
| 1011 | * and security checks. This function is intended to be wrapped by |
| 1012 | * callers who wish to add additional ioctl calls of their own. |
| 1013 | */ |
| 1014 | |
| 1015 | int sppp_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
| 1016 | { |
| 1017 | struct sppp *sp = (struct sppp *)sppp_of(dev); |
| 1018 | |
| 1019 | if(dev->flags&IFF_UP) |
| 1020 | return -EBUSY; |
| 1021 | |
| 1022 | if(!capable(CAP_NET_ADMIN)) |
| 1023 | return -EPERM; |
| 1024 | |
| 1025 | switch(cmd) |
| 1026 | { |
| 1027 | case SPPPIOCCISCO: |
| 1028 | sp->pp_flags|=PP_CISCO; |
| 1029 | dev->type = ARPHRD_HDLC; |
| 1030 | break; |
| 1031 | case SPPPIOCPPP: |
| 1032 | sp->pp_flags&=~PP_CISCO; |
| 1033 | dev->type = ARPHRD_PPP; |
| 1034 | break; |
| 1035 | case SPPPIOCDEBUG: |
| 1036 | sp->pp_flags&=~PP_DEBUG; |
| 1037 | if(ifr->ifr_flags) |
| 1038 | sp->pp_flags|=PP_DEBUG; |
| 1039 | break; |
| 1040 | case SPPPIOCGFLAGS: |
| 1041 | if(copy_to_user(ifr->ifr_data, &sp->pp_flags, sizeof(sp->pp_flags))) |
| 1042 | return -EFAULT; |
| 1043 | break; |
| 1044 | case SPPPIOCSFLAGS: |
| 1045 | if(copy_from_user(&sp->pp_flags, ifr->ifr_data, sizeof(sp->pp_flags))) |
| 1046 | return -EFAULT; |
| 1047 | break; |
| 1048 | default: |
| 1049 | return -EINVAL; |
| 1050 | } |
| 1051 | return 0; |
| 1052 | } |
| 1053 | |
| 1054 | EXPORT_SYMBOL(sppp_do_ioctl); |
| 1055 | |
| 1056 | /** |
| 1057 | * sppp_attach - attach synchronous PPP/HDLC to a device |
| 1058 | * @pd: PPP device to initialise |
| 1059 | * |
| 1060 | * This initialises the PPP/HDLC support on an interface. At the |
| 1061 | * time of calling the dev element must point to the network device |
| 1062 | * that this interface is attached to. The interface should not yet |
| 1063 | * be registered. |
| 1064 | */ |
| 1065 | |
| 1066 | void sppp_attach(struct ppp_device *pd) |
| 1067 | { |
| 1068 | struct net_device *dev = pd->dev; |
| 1069 | struct sppp *sp = &pd->sppp; |
| 1070 | unsigned long flags; |
| 1071 | |
| 1072 | /* Make sure embedding is safe for sppp_of */ |
| 1073 | BUG_ON(sppp_of(dev) != sp); |
| 1074 | |
| 1075 | spin_lock_irqsave(&spppq_lock, flags); |
| 1076 | /* Initialize keepalive handler. */ |
| 1077 | if (! spppq) |
| 1078 | { |
| 1079 | init_timer(&sppp_keepalive_timer); |
| 1080 | sppp_keepalive_timer.expires=jiffies+10*HZ; |
| 1081 | sppp_keepalive_timer.function=sppp_keepalive; |
| 1082 | add_timer(&sppp_keepalive_timer); |
| 1083 | } |
| 1084 | /* Insert new entry into the keepalive list. */ |
| 1085 | sp->pp_next = spppq; |
| 1086 | spppq = sp; |
| 1087 | spin_unlock_irqrestore(&spppq_lock, flags); |
| 1088 | |
| 1089 | sp->pp_loopcnt = 0; |
| 1090 | sp->pp_alivecnt = 0; |
| 1091 | sp->pp_seq = 0; |
| 1092 | sp->pp_rseq = 0; |
| 1093 | sp->pp_flags = PP_KEEPALIVE|PP_CISCO|debug;/*PP_DEBUG;*/ |
| 1094 | sp->lcp.magic = 0; |
| 1095 | sp->lcp.state = LCP_STATE_CLOSED; |
| 1096 | sp->ipcp.state = IPCP_STATE_CLOSED; |
| 1097 | sp->pp_if = dev; |
| 1098 | spin_lock_init(&sp->lock); |
| 1099 | |
| 1100 | /* |
| 1101 | * Device specific setup. All but interrupt handler and |
| 1102 | * hard_start_xmit. |
| 1103 | */ |
| 1104 | |
| 1105 | dev->hard_header = sppp_hard_header; |
| 1106 | dev->rebuild_header = sppp_rebuild_header; |
| 1107 | dev->tx_queue_len = 10; |
| 1108 | dev->type = ARPHRD_HDLC; |
| 1109 | dev->addr_len = 0; |
| 1110 | dev->hard_header_len = sizeof(struct ppp_header); |
| 1111 | dev->mtu = PPP_MTU; |
| 1112 | /* |
| 1113 | * These 4 are callers but MUST also call sppp_ functions |
| 1114 | */ |
| 1115 | dev->do_ioctl = sppp_do_ioctl; |
| 1116 | #if 0 |
| 1117 | dev->get_stats = NULL; /* Let the driver override these */ |
| 1118 | dev->open = sppp_open; |
| 1119 | dev->stop = sppp_close; |
| 1120 | #endif |
| 1121 | dev->change_mtu = sppp_change_mtu; |
| 1122 | dev->hard_header_cache = NULL; |
| 1123 | dev->header_cache_update = NULL; |
| 1124 | dev->flags = IFF_MULTICAST|IFF_POINTOPOINT|IFF_NOARP; |
| 1125 | } |
| 1126 | |
| 1127 | EXPORT_SYMBOL(sppp_attach); |
| 1128 | |
| 1129 | /** |
| 1130 | * sppp_detach - release PPP resources from a device |
| 1131 | * @dev: Network device to release |
| 1132 | * |
| 1133 | * Stop and free up any PPP/HDLC resources used by this |
| 1134 | * interface. This must be called before the device is |
| 1135 | * freed. |
| 1136 | */ |
| 1137 | |
| 1138 | void sppp_detach (struct net_device *dev) |
| 1139 | { |
| 1140 | struct sppp **q, *p, *sp = (struct sppp *)sppp_of(dev); |
| 1141 | unsigned long flags; |
| 1142 | |
| 1143 | spin_lock_irqsave(&spppq_lock, flags); |
| 1144 | /* Remove the entry from the keepalive list. */ |
| 1145 | for (q = &spppq; (p = *q); q = &p->pp_next) |
| 1146 | if (p == sp) { |
| 1147 | *q = p->pp_next; |
| 1148 | break; |
| 1149 | } |
| 1150 | |
| 1151 | /* Stop keepalive handler. */ |
| 1152 | if (! spppq) |
| 1153 | del_timer(&sppp_keepalive_timer); |
| 1154 | sppp_clear_timeout (sp); |
| 1155 | spin_unlock_irqrestore(&spppq_lock, flags); |
| 1156 | } |
| 1157 | |
| 1158 | EXPORT_SYMBOL(sppp_detach); |
| 1159 | |
| 1160 | /* |
| 1161 | * Analyze the LCP Configure-Request options list |
| 1162 | * for the presence of unknown options. |
| 1163 | * If the request contains unknown options, build and |
| 1164 | * send Configure-reject packet, containing only unknown options. |
| 1165 | */ |
| 1166 | static int |
| 1167 | sppp_lcp_conf_parse_options (struct sppp *sp, struct lcp_header *h, |
| 1168 | int len, u32 *magic) |
| 1169 | { |
| 1170 | u8 *buf, *r, *p; |
| 1171 | int rlen; |
| 1172 | |
| 1173 | len -= 4; |
| 1174 | buf = r = kmalloc (len, GFP_ATOMIC); |
| 1175 | if (! buf) |
| 1176 | return (0); |
| 1177 | |
| 1178 | p = (void*) (h+1); |
| 1179 | for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) { |
| 1180 | switch (*p) { |
| 1181 | case LCP_OPT_MAGIC: |
| 1182 | /* Magic number -- extract. */ |
| 1183 | if (len >= 6 && p[1] == 6) { |
| 1184 | *magic = (u32)p[2] << 24 | |
| 1185 | (u32)p[3] << 16 | p[4] << 8 | p[5]; |
| 1186 | continue; |
| 1187 | } |
| 1188 | break; |
| 1189 | case LCP_OPT_ASYNC_MAP: |
| 1190 | /* Async control character map -- check to be zero. */ |
| 1191 | if (len >= 6 && p[1] == 6 && ! p[2] && ! p[3] && |
| 1192 | ! p[4] && ! p[5]) |
| 1193 | continue; |
| 1194 | break; |
| 1195 | case LCP_OPT_MRU: |
| 1196 | /* Maximum receive unit -- always OK. */ |
| 1197 | continue; |
| 1198 | default: |
| 1199 | /* Others not supported. */ |
| 1200 | break; |
| 1201 | } |
| 1202 | /* Add the option to rejected list. */ |
| 1203 | memcpy(r, p, p[1]); |
| 1204 | r += p[1]; |
| 1205 | rlen += p[1]; |
| 1206 | } |
| 1207 | if (rlen) |
| 1208 | sppp_cp_send (sp, PPP_LCP, LCP_CONF_REJ, h->ident, rlen, buf); |
| 1209 | kfree(buf); |
| 1210 | return (rlen == 0); |
| 1211 | } |
| 1212 | |
| 1213 | static void sppp_ipcp_input (struct sppp *sp, struct sk_buff *skb) |
| 1214 | { |
| 1215 | struct lcp_header *h; |
| 1216 | struct net_device *dev = sp->pp_if; |
| 1217 | int len = skb->len; |
| 1218 | |
| 1219 | if (!pskb_may_pull(skb, sizeof(struct lcp_header))) { |
| 1220 | if (sp->pp_flags & PP_DEBUG) |
| 1221 | printk (KERN_WARNING "%s: invalid ipcp packet length: %d bytes\n", |
| 1222 | dev->name, len); |
| 1223 | return; |
| 1224 | } |
| 1225 | h = (struct lcp_header *)skb->data; |
| 1226 | skb_pull(skb,sizeof(struct lcp_header)); |
| 1227 | if (sp->pp_flags & PP_DEBUG) { |
| 1228 | printk (KERN_WARNING "%s: ipcp input: %d bytes <%s id=%xh len=%xh", |
| 1229 | dev->name, len, |
| 1230 | sppp_ipcp_type_name (h->type), h->ident, ntohs (h->len)); |
| 1231 | if (len > 4) |
| 1232 | sppp_print_bytes ((u8*) (h+1), len-4); |
| 1233 | printk (">\n"); |
| 1234 | } |
| 1235 | if (len > ntohs (h->len)) |
| 1236 | len = ntohs (h->len); |
| 1237 | switch (h->type) { |
| 1238 | default: |
| 1239 | /* Unknown packet type -- send Code-Reject packet. */ |
| 1240 | sppp_cp_send (sp, PPP_IPCP, IPCP_CODE_REJ, ++sp->pp_seq, len, h); |
| 1241 | break; |
| 1242 | case IPCP_CONF_REQ: |
| 1243 | if (len < 4) { |
| 1244 | if (sp->pp_flags & PP_DEBUG) |
| 1245 | printk (KERN_WARNING "%s: invalid ipcp configure request packet length: %d bytes\n", |
| 1246 | dev->name, len); |
| 1247 | return; |
| 1248 | } |
| 1249 | if (len > 4) { |
| 1250 | sppp_cp_send (sp, PPP_IPCP, LCP_CONF_REJ, h->ident, |
| 1251 | len-4, h+1); |
| 1252 | |
| 1253 | switch (sp->ipcp.state) { |
| 1254 | case IPCP_STATE_OPENED: |
| 1255 | /* Initiate renegotiation. */ |
| 1256 | sppp_ipcp_open (sp); |
| 1257 | /* fall through... */ |
| 1258 | case IPCP_STATE_ACK_SENT: |
| 1259 | /* Go to closed state. */ |
| 1260 | sp->ipcp.state = IPCP_STATE_CLOSED; |
| 1261 | } |
| 1262 | } else { |
| 1263 | /* Send Configure-Ack packet. */ |
| 1264 | sppp_cp_send (sp, PPP_IPCP, IPCP_CONF_ACK, h->ident, |
| 1265 | 0, NULL); |
| 1266 | /* Change the state. */ |
| 1267 | if (sp->ipcp.state == IPCP_STATE_ACK_RCVD) |
| 1268 | sp->ipcp.state = IPCP_STATE_OPENED; |
| 1269 | else |
| 1270 | sp->ipcp.state = IPCP_STATE_ACK_SENT; |
| 1271 | } |
| 1272 | break; |
| 1273 | case IPCP_CONF_ACK: |
| 1274 | if (h->ident != sp->ipcp.confid) |
| 1275 | break; |
| 1276 | sppp_clear_timeout (sp); |
| 1277 | switch (sp->ipcp.state) { |
| 1278 | case IPCP_STATE_CLOSED: |
| 1279 | sp->ipcp.state = IPCP_STATE_ACK_RCVD; |
| 1280 | sppp_set_timeout (sp, 5); |
| 1281 | break; |
| 1282 | case IPCP_STATE_ACK_SENT: |
| 1283 | sp->ipcp.state = IPCP_STATE_OPENED; |
| 1284 | break; |
| 1285 | } |
| 1286 | break; |
| 1287 | case IPCP_CONF_NAK: |
| 1288 | case IPCP_CONF_REJ: |
| 1289 | if (h->ident != sp->ipcp.confid) |
| 1290 | break; |
| 1291 | sppp_clear_timeout (sp); |
| 1292 | /* Initiate renegotiation. */ |
| 1293 | sppp_ipcp_open (sp); |
| 1294 | if (sp->ipcp.state != IPCP_STATE_ACK_SENT) |
| 1295 | /* Go to closed state. */ |
| 1296 | sp->ipcp.state = IPCP_STATE_CLOSED; |
| 1297 | break; |
| 1298 | case IPCP_TERM_REQ: |
| 1299 | /* Send Terminate-Ack packet. */ |
| 1300 | sppp_cp_send (sp, PPP_IPCP, IPCP_TERM_ACK, h->ident, 0, NULL); |
| 1301 | /* Go to closed state. */ |
| 1302 | sp->ipcp.state = IPCP_STATE_CLOSED; |
| 1303 | /* Initiate renegotiation. */ |
| 1304 | sppp_ipcp_open (sp); |
| 1305 | break; |
| 1306 | case IPCP_TERM_ACK: |
| 1307 | /* Ignore for now. */ |
| 1308 | case IPCP_CODE_REJ: |
| 1309 | /* Ignore for now. */ |
| 1310 | break; |
| 1311 | } |
| 1312 | } |
| 1313 | |
| 1314 | static void sppp_lcp_open (struct sppp *sp) |
| 1315 | { |
| 1316 | char opt[6]; |
| 1317 | |
| 1318 | if (! sp->lcp.magic) |
| 1319 | sp->lcp.magic = jiffies; |
| 1320 | opt[0] = LCP_OPT_MAGIC; |
| 1321 | opt[1] = sizeof (opt); |
| 1322 | opt[2] = sp->lcp.magic >> 24; |
| 1323 | opt[3] = sp->lcp.magic >> 16; |
| 1324 | opt[4] = sp->lcp.magic >> 8; |
| 1325 | opt[5] = sp->lcp.magic; |
| 1326 | sp->lcp.confid = ++sp->pp_seq; |
| 1327 | sppp_cp_send (sp, PPP_LCP, LCP_CONF_REQ, sp->lcp.confid, |
| 1328 | sizeof (opt), &opt); |
| 1329 | sppp_set_timeout (sp, 2); |
| 1330 | } |
| 1331 | |
| 1332 | static void sppp_ipcp_open (struct sppp *sp) |
| 1333 | { |
| 1334 | sp->ipcp.confid = ++sp->pp_seq; |
| 1335 | sppp_cp_send (sp, PPP_IPCP, IPCP_CONF_REQ, sp->ipcp.confid, 0, NULL); |
| 1336 | sppp_set_timeout (sp, 2); |
| 1337 | } |
| 1338 | |
| 1339 | /* |
| 1340 | * Process PPP control protocol timeouts. |
| 1341 | */ |
| 1342 | |
| 1343 | static void sppp_cp_timeout (unsigned long arg) |
| 1344 | { |
| 1345 | struct sppp *sp = (struct sppp*) arg; |
| 1346 | unsigned long flags; |
| 1347 | |
| 1348 | spin_lock_irqsave(&sp->lock, flags); |
| 1349 | |
| 1350 | sp->pp_flags &= ~PP_TIMO; |
| 1351 | if (! (sp->pp_if->flags & IFF_UP) || (sp->pp_flags & PP_CISCO)) { |
| 1352 | spin_unlock_irqrestore(&sp->lock, flags); |
| 1353 | return; |
| 1354 | } |
| 1355 | switch (sp->lcp.state) { |
| 1356 | case LCP_STATE_CLOSED: |
| 1357 | /* No ACK for Configure-Request, retry. */ |
| 1358 | sppp_lcp_open (sp); |
| 1359 | break; |
| 1360 | case LCP_STATE_ACK_RCVD: |
| 1361 | /* ACK got, but no Configure-Request for peer, retry. */ |
| 1362 | sppp_lcp_open (sp); |
| 1363 | sp->lcp.state = LCP_STATE_CLOSED; |
| 1364 | break; |
| 1365 | case LCP_STATE_ACK_SENT: |
| 1366 | /* ACK sent but no ACK for Configure-Request, retry. */ |
| 1367 | sppp_lcp_open (sp); |
| 1368 | break; |
| 1369 | case LCP_STATE_OPENED: |
| 1370 | /* LCP is already OK, try IPCP. */ |
| 1371 | switch (sp->ipcp.state) { |
| 1372 | case IPCP_STATE_CLOSED: |
| 1373 | /* No ACK for Configure-Request, retry. */ |
| 1374 | sppp_ipcp_open (sp); |
| 1375 | break; |
| 1376 | case IPCP_STATE_ACK_RCVD: |
| 1377 | /* ACK got, but no Configure-Request for peer, retry. */ |
| 1378 | sppp_ipcp_open (sp); |
| 1379 | sp->ipcp.state = IPCP_STATE_CLOSED; |
| 1380 | break; |
| 1381 | case IPCP_STATE_ACK_SENT: |
| 1382 | /* ACK sent but no ACK for Configure-Request, retry. */ |
| 1383 | sppp_ipcp_open (sp); |
| 1384 | break; |
| 1385 | case IPCP_STATE_OPENED: |
| 1386 | /* IPCP is OK. */ |
| 1387 | break; |
| 1388 | } |
| 1389 | break; |
| 1390 | } |
| 1391 | spin_unlock_irqrestore(&sp->lock, flags); |
| 1392 | sppp_flush_xmit(); |
| 1393 | } |
| 1394 | |
| 1395 | static char *sppp_lcp_type_name (u8 type) |
| 1396 | { |
| 1397 | static char buf [8]; |
| 1398 | switch (type) { |
| 1399 | case LCP_CONF_REQ: return ("conf-req"); |
| 1400 | case LCP_CONF_ACK: return ("conf-ack"); |
| 1401 | case LCP_CONF_NAK: return ("conf-nack"); |
| 1402 | case LCP_CONF_REJ: return ("conf-rej"); |
| 1403 | case LCP_TERM_REQ: return ("term-req"); |
| 1404 | case LCP_TERM_ACK: return ("term-ack"); |
| 1405 | case LCP_CODE_REJ: return ("code-rej"); |
| 1406 | case LCP_PROTO_REJ: return ("proto-rej"); |
| 1407 | case LCP_ECHO_REQ: return ("echo-req"); |
| 1408 | case LCP_ECHO_REPLY: return ("echo-reply"); |
| 1409 | case LCP_DISC_REQ: return ("discard-req"); |
| 1410 | } |
| 1411 | sprintf (buf, "%xh", type); |
| 1412 | return (buf); |
| 1413 | } |
| 1414 | |
| 1415 | static char *sppp_ipcp_type_name (u8 type) |
| 1416 | { |
| 1417 | static char buf [8]; |
| 1418 | switch (type) { |
| 1419 | case IPCP_CONF_REQ: return ("conf-req"); |
| 1420 | case IPCP_CONF_ACK: return ("conf-ack"); |
| 1421 | case IPCP_CONF_NAK: return ("conf-nack"); |
| 1422 | case IPCP_CONF_REJ: return ("conf-rej"); |
| 1423 | case IPCP_TERM_REQ: return ("term-req"); |
| 1424 | case IPCP_TERM_ACK: return ("term-ack"); |
| 1425 | case IPCP_CODE_REJ: return ("code-rej"); |
| 1426 | } |
| 1427 | sprintf (buf, "%xh", type); |
| 1428 | return (buf); |
| 1429 | } |
| 1430 | |
| 1431 | static void sppp_print_bytes (u_char *p, u16 len) |
| 1432 | { |
| 1433 | printk (" %x", *p++); |
| 1434 | while (--len > 0) |
| 1435 | printk ("-%x", *p++); |
| 1436 | } |
| 1437 | |
| 1438 | /** |
| 1439 | * sppp_rcv - receive and process a WAN PPP frame |
| 1440 | * @skb: The buffer to process |
| 1441 | * @dev: The device it arrived on |
| 1442 | * @p: Unused |
| 1443 | * |
| 1444 | * Protocol glue. This drives the deferred processing mode the poorer |
| 1445 | * cards use. This can be called directly by cards that do not have |
| 1446 | * timing constraints but is normally called from the network layer |
| 1447 | * after interrupt servicing to process frames queued via netif_rx. |
| 1448 | */ |
| 1449 | |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame^] | 1450 | static int sppp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *p, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | { |
| 1452 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
| 1453 | return NET_RX_DROP; |
| 1454 | sppp_input(dev,skb); |
| 1455 | return 0; |
| 1456 | } |
| 1457 | |
| 1458 | struct packet_type sppp_packet_type = { |
| 1459 | .type = __constant_htons(ETH_P_WAN_PPP), |
| 1460 | .func = sppp_rcv, |
| 1461 | }; |
| 1462 | |
| 1463 | static char banner[] __initdata = |
| 1464 | KERN_INFO "Cronyx Ltd, Synchronous PPP and CISCO HDLC (c) 1994\n" |
| 1465 | KERN_INFO "Linux port (c) 1998 Building Number Three Ltd & " |
| 1466 | "Jan \"Yenya\" Kasprzak.\n"; |
| 1467 | |
| 1468 | static int __init sync_ppp_init(void) |
| 1469 | { |
| 1470 | if(debug) |
| 1471 | debug=PP_DEBUG; |
| 1472 | printk(banner); |
| 1473 | skb_queue_head_init(&tx_queue); |
| 1474 | dev_add_pack(&sppp_packet_type); |
| 1475 | return 0; |
| 1476 | } |
| 1477 | |
| 1478 | |
| 1479 | static void __exit sync_ppp_cleanup(void) |
| 1480 | { |
| 1481 | dev_remove_pack(&sppp_packet_type); |
| 1482 | } |
| 1483 | |
| 1484 | module_init(sync_ppp_init); |
| 1485 | module_exit(sync_ppp_cleanup); |
| 1486 | module_param(debug, int, 0); |
| 1487 | MODULE_LICENSE("GPL"); |
| 1488 | |