Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Generic HDLC support routines for Linux | |
3 | * Point-to-point protocol support | |
4 | * | |
e022c2f0 | 5 | * Copyright (C) 1999 - 2008 Krzysztof Halasa <khc@pm.waw.pl> |
1da177e4 LT |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of version 2 of the GNU General Public License | |
9 | * as published by the Free Software Foundation. | |
10 | */ | |
11 | ||
1da177e4 | 12 | #include <linux/errno.h> |
4dfce407 | 13 | #include <linux/hdlc.h> |
1da177e4 | 14 | #include <linux/if_arp.h> |
4dfce407 | 15 | #include <linux/inetdevice.h> |
1da177e4 | 16 | #include <linux/init.h> |
4dfce407 KH |
17 | #include <linux/kernel.h> |
18 | #include <linux/module.h> | |
1da177e4 | 19 | #include <linux/pkt_sched.h> |
4dfce407 | 20 | #include <linux/poll.h> |
4dfce407 KH |
21 | #include <linux/skbuff.h> |
22 | #include <linux/slab.h> | |
e022c2f0 KH |
23 | #include <linux/spinlock.h> |
24 | ||
25 | #define DEBUG_CP 0 /* also bytes# to dump */ | |
26 | #define DEBUG_STATE 0 | |
27 | #define DEBUG_HARD_HEADER 0 | |
28 | ||
29 | #define HDLC_ADDR_ALLSTATIONS 0xFF | |
30 | #define HDLC_CTRL_UI 0x03 | |
31 | ||
32 | #define PID_LCP 0xC021 | |
33 | #define PID_IP 0x0021 | |
34 | #define PID_IPCP 0x8021 | |
35 | #define PID_IPV6 0x0057 | |
36 | #define PID_IPV6CP 0x8057 | |
37 | ||
38 | enum {IDX_LCP = 0, IDX_IPCP, IDX_IPV6CP, IDX_COUNT}; | |
39 | enum {CP_CONF_REQ = 1, CP_CONF_ACK, CP_CONF_NAK, CP_CONF_REJ, CP_TERM_REQ, | |
40 | CP_TERM_ACK, CP_CODE_REJ, LCP_PROTO_REJ, LCP_ECHO_REQ, LCP_ECHO_REPLY, | |
41 | LCP_DISC_REQ, CP_CODES}; | |
42 | #if DEBUG_CP | |
43 | static const char *const code_names[CP_CODES] = { | |
44 | "0", "ConfReq", "ConfAck", "ConfNak", "ConfRej", "TermReq", | |
45 | "TermAck", "CodeRej", "ProtoRej", "EchoReq", "EchoReply", "Discard" | |
46 | }; | |
47 | static char debug_buffer[64 + 3 * DEBUG_CP]; | |
48 | #endif | |
49 | ||
50 | enum {LCP_OPTION_MRU = 1, LCP_OPTION_ACCM, LCP_OPTION_MAGIC = 5}; | |
51 | ||
52 | struct hdlc_header { | |
53 | u8 address; | |
54 | u8 control; | |
55 | __be16 protocol; | |
56 | }; | |
57 | ||
58 | struct cp_header { | |
59 | u8 code; | |
60 | u8 id; | |
61 | __be16 len; | |
62 | }; | |
63 | ||
eb2a2fd9 | 64 | |
e022c2f0 KH |
65 | struct proto { |
66 | struct net_device *dev; | |
67 | struct timer_list timer; | |
68 | unsigned long timeout; | |
69 | u16 pid; /* protocol ID */ | |
70 | u8 state; | |
71 | u8 cr_id; /* ID of last Configuration-Request */ | |
72 | u8 restart_counter; | |
eb2a2fd9 KH |
73 | }; |
74 | ||
e022c2f0 KH |
75 | struct ppp { |
76 | struct proto protos[IDX_COUNT]; | |
77 | spinlock_t lock; | |
78 | unsigned long last_pong; | |
79 | unsigned int req_timeout, cr_retries, term_retries; | |
80 | unsigned int keepalive_interval, keepalive_timeout; | |
81 | u8 seq; /* local sequence number for requests */ | |
82 | u8 echo_id; /* ID of last Echo-Request (LCP) */ | |
83 | }; | |
84 | ||
85 | enum {CLOSED = 0, STOPPED, STOPPING, REQ_SENT, ACK_RECV, ACK_SENT, OPENED, | |
86 | STATES, STATE_MASK = 0xF}; | |
87 | enum {START = 0, STOP, TO_GOOD, TO_BAD, RCR_GOOD, RCR_BAD, RCA, RCN, RTR, RTA, | |
88 | RUC, RXJ_GOOD, RXJ_BAD, EVENTS}; | |
89 | enum {INV = 0x10, IRC = 0x20, ZRC = 0x40, SCR = 0x80, SCA = 0x100, | |
90 | SCN = 0x200, STR = 0x400, STA = 0x800, SCJ = 0x1000}; | |
91 | ||
92 | #if DEBUG_STATE | |
93 | static const char *const state_names[STATES] = { | |
94 | "Closed", "Stopped", "Stopping", "ReqSent", "AckRecv", "AckSent", | |
95 | "Opened" | |
96 | }; | |
97 | static const char *const event_names[EVENTS] = { | |
98 | "Start", "Stop", "TO+", "TO-", "RCR+", "RCR-", "RCA", "RCN", | |
99 | "RTR", "RTA", "RUC", "RXJ+", "RXJ-" | |
100 | }; | |
101 | #endif | |
102 | ||
103 | static struct sk_buff_head tx_queue; /* used when holding the spin lock */ | |
104 | ||
eb2a2fd9 KH |
105 | static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr); |
106 | ||
e022c2f0 KH |
107 | static inline struct ppp* get_ppp(struct net_device *dev) |
108 | { | |
109 | return (struct ppp *)dev_to_hdlc(dev)->state; | |
110 | } | |
eb2a2fd9 | 111 | |
e022c2f0 | 112 | static inline struct proto* get_proto(struct net_device *dev, u16 pid) |
eb2a2fd9 | 113 | { |
e022c2f0 KH |
114 | struct ppp *ppp = get_ppp(dev); |
115 | ||
116 | switch (pid) { | |
117 | case PID_LCP: | |
118 | return &ppp->protos[IDX_LCP]; | |
119 | case PID_IPCP: | |
120 | return &ppp->protos[IDX_IPCP]; | |
121 | case PID_IPV6CP: | |
122 | return &ppp->protos[IDX_IPV6CP]; | |
123 | default: | |
124 | return NULL; | |
125 | } | |
eb2a2fd9 | 126 | } |
1da177e4 | 127 | |
e022c2f0 KH |
128 | static inline const char* proto_name(u16 pid) |
129 | { | |
130 | switch (pid) { | |
131 | case PID_LCP: | |
132 | return "LCP"; | |
133 | case PID_IPCP: | |
134 | return "IPCP"; | |
135 | case PID_IPV6CP: | |
136 | return "IPV6CP"; | |
137 | default: | |
138 | return NULL; | |
139 | } | |
140 | } | |
1da177e4 | 141 | |
e022c2f0 | 142 | static __be16 ppp_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 143 | { |
e022c2f0 KH |
144 | struct hdlc_header *data = (struct hdlc_header*)skb->data; |
145 | ||
146 | if (skb->len < sizeof(struct hdlc_header)) | |
147 | return htons(ETH_P_HDLC); | |
148 | if (data->address != HDLC_ADDR_ALLSTATIONS || | |
149 | data->control != HDLC_CTRL_UI) | |
150 | return htons(ETH_P_HDLC); | |
151 | ||
152 | switch (data->protocol) { | |
09640e63 | 153 | case cpu_to_be16(PID_IP): |
e022c2f0 KH |
154 | skb_pull(skb, sizeof(struct hdlc_header)); |
155 | return htons(ETH_P_IP); | |
1da177e4 | 156 | |
09640e63 | 157 | case cpu_to_be16(PID_IPV6): |
e022c2f0 KH |
158 | skb_pull(skb, sizeof(struct hdlc_header)); |
159 | return htons(ETH_P_IPV6); | |
1da177e4 | 160 | |
e022c2f0 KH |
161 | default: |
162 | return htons(ETH_P_HDLC); | |
1da177e4 | 163 | } |
e022c2f0 | 164 | } |
1da177e4 | 165 | |
e022c2f0 KH |
166 | |
167 | static int ppp_hard_header(struct sk_buff *skb, struct net_device *dev, | |
168 | u16 type, const void *daddr, const void *saddr, | |
169 | unsigned int len) | |
170 | { | |
171 | struct hdlc_header *data; | |
172 | #if DEBUG_HARD_HEADER | |
173 | printk(KERN_DEBUG "%s: ppp_hard_header() called\n", dev->name); | |
174 | #endif | |
175 | ||
176 | skb_push(skb, sizeof(struct hdlc_header)); | |
177 | data = (struct hdlc_header*)skb->data; | |
178 | ||
179 | data->address = HDLC_ADDR_ALLSTATIONS; | |
180 | data->control = HDLC_CTRL_UI; | |
181 | switch (type) { | |
182 | case ETH_P_IP: | |
183 | data->protocol = htons(PID_IP); | |
184 | break; | |
185 | case ETH_P_IPV6: | |
186 | data->protocol = htons(PID_IPV6); | |
187 | break; | |
188 | case PID_LCP: | |
189 | case PID_IPCP: | |
190 | case PID_IPV6CP: | |
191 | data->protocol = htons(type); | |
192 | break; | |
193 | default: /* unknown protocol */ | |
194 | data->protocol = 0; | |
195 | } | |
196 | return sizeof(struct hdlc_header); | |
1da177e4 LT |
197 | } |
198 | ||
199 | ||
e022c2f0 KH |
200 | static void ppp_tx_flush(void) |
201 | { | |
202 | struct sk_buff *skb; | |
203 | while ((skb = skb_dequeue(&tx_queue)) != NULL) | |
204 | dev_queue_xmit(skb); | |
205 | } | |
1da177e4 | 206 | |
e022c2f0 KH |
207 | static void ppp_tx_cp(struct net_device *dev, u16 pid, u8 code, |
208 | u8 id, unsigned int len, const void *data) | |
1da177e4 | 209 | { |
e022c2f0 KH |
210 | struct sk_buff *skb; |
211 | struct cp_header *cp; | |
212 | unsigned int magic_len = 0; | |
213 | static u32 magic; | |
214 | ||
215 | #if DEBUG_CP | |
216 | int i; | |
217 | char *ptr; | |
218 | #endif | |
219 | ||
220 | if (pid == PID_LCP && (code == LCP_ECHO_REQ || code == LCP_ECHO_REPLY)) | |
221 | magic_len = sizeof(magic); | |
222 | ||
223 | skb = dev_alloc_skb(sizeof(struct hdlc_header) + | |
224 | sizeof(struct cp_header) + magic_len + len); | |
225 | if (!skb) { | |
12a3bfef | 226 | netdev_warn(dev, "out of memory in ppp_tx_cp()\n"); |
e022c2f0 KH |
227 | return; |
228 | } | |
229 | skb_reserve(skb, sizeof(struct hdlc_header)); | |
230 | ||
231 | cp = (struct cp_header *)skb_put(skb, sizeof(struct cp_header)); | |
232 | cp->code = code; | |
233 | cp->id = id; | |
234 | cp->len = htons(sizeof(struct cp_header) + magic_len + len); | |
235 | ||
236 | if (magic_len) | |
237 | memcpy(skb_put(skb, magic_len), &magic, magic_len); | |
238 | if (len) | |
239 | memcpy(skb_put(skb, len), data, len); | |
240 | ||
241 | #if DEBUG_CP | |
242 | BUG_ON(code >= CP_CODES); | |
243 | ptr = debug_buffer; | |
244 | *ptr = '\x0'; | |
245 | for (i = 0; i < min_t(unsigned int, magic_len + len, DEBUG_CP); i++) { | |
246 | sprintf(ptr, " %02X", skb->data[sizeof(struct cp_header) + i]); | |
247 | ptr += strlen(ptr); | |
248 | } | |
249 | printk(KERN_DEBUG "%s: TX %s [%s id 0x%X]%s\n", dev->name, | |
250 | proto_name(pid), code_names[code], id, debug_buffer); | |
251 | #endif | |
1da177e4 | 252 | |
e022c2f0 | 253 | ppp_hard_header(skb, dev, pid, NULL, NULL, 0); |
3b04ddde | 254 | |
e022c2f0 KH |
255 | skb->priority = TC_PRIO_CONTROL; |
256 | skb->dev = dev; | |
257 | skb_reset_network_header(skb); | |
258 | skb_queue_tail(&tx_queue, skb); | |
1da177e4 LT |
259 | } |
260 | ||
261 | ||
e022c2f0 KH |
262 | /* State transition table (compare STD-51) |
263 | Events Actions | |
264 | TO+ = Timeout with counter > 0 irc = Initialize-Restart-Count | |
265 | TO- = Timeout with counter expired zrc = Zero-Restart-Count | |
266 | ||
267 | RCR+ = Receive-Configure-Request (Good) scr = Send-Configure-Request | |
268 | RCR- = Receive-Configure-Request (Bad) | |
269 | RCA = Receive-Configure-Ack sca = Send-Configure-Ack | |
270 | RCN = Receive-Configure-Nak/Rej scn = Send-Configure-Nak/Rej | |
271 | ||
272 | RTR = Receive-Terminate-Request str = Send-Terminate-Request | |
273 | RTA = Receive-Terminate-Ack sta = Send-Terminate-Ack | |
274 | ||
275 | RUC = Receive-Unknown-Code scj = Send-Code-Reject | |
276 | RXJ+ = Receive-Code-Reject (permitted) | |
277 | or Receive-Protocol-Reject | |
278 | RXJ- = Receive-Code-Reject (catastrophic) | |
279 | or Receive-Protocol-Reject | |
280 | */ | |
281 | static int cp_table[EVENTS][STATES] = { | |
282 | /* CLOSED STOPPED STOPPING REQ_SENT ACK_RECV ACK_SENT OPENED | |
283 | 0 1 2 3 4 5 6 */ | |
284 | {IRC|SCR|3, INV , INV , INV , INV , INV , INV }, /* START */ | |
285 | { INV , 0 , 0 , 0 , 0 , 0 , 0 }, /* STOP */ | |
286 | { INV , INV ,STR|2, SCR|3 ,SCR|3, SCR|5 , INV }, /* TO+ */ | |
287 | { INV , INV , 1 , 1 , 1 , 1 , INV }, /* TO- */ | |
288 | { STA|0 ,IRC|SCR|SCA|5, 2 , SCA|5 ,SCA|6, SCA|5 ,SCR|SCA|5}, /* RCR+ */ | |
289 | { STA|0 ,IRC|SCR|SCN|3, 2 , SCN|3 ,SCN|4, SCN|3 ,SCR|SCN|3}, /* RCR- */ | |
290 | { STA|0 , STA|1 , 2 , IRC|4 ,SCR|3, 6 , SCR|3 }, /* RCA */ | |
291 | { STA|0 , STA|1 , 2 ,IRC|SCR|3,SCR|3,IRC|SCR|5, SCR|3 }, /* RCN */ | |
292 | { STA|0 , STA|1 ,STA|2, STA|3 ,STA|3, STA|3 ,ZRC|STA|2}, /* RTR */ | |
293 | { 0 , 1 , 1 , 3 , 3 , 5 , SCR|3 }, /* RTA */ | |
294 | { SCJ|0 , SCJ|1 ,SCJ|2, SCJ|3 ,SCJ|4, SCJ|5 , SCJ|6 }, /* RUC */ | |
295 | { 0 , 1 , 2 , 3 , 3 , 5 , 6 }, /* RXJ+ */ | |
296 | { 0 , 1 , 1 , 1 , 1 , 1 ,IRC|STR|2}, /* RXJ- */ | |
297 | }; | |
298 | ||
1da177e4 | 299 | |
e022c2f0 KH |
300 | /* SCA: RCR+ must supply id, len and data |
301 | SCN: RCR- must supply code, id, len and data | |
302 | STA: RTR must supply id | |
303 | SCJ: RUC must supply CP packet len and data */ | |
304 | static void ppp_cp_event(struct net_device *dev, u16 pid, u16 event, u8 code, | |
93bc9335 | 305 | u8 id, unsigned int len, const void *data) |
1da177e4 | 306 | { |
e022c2f0 KH |
307 | int old_state, action; |
308 | struct ppp *ppp = get_ppp(dev); | |
309 | struct proto *proto = get_proto(dev, pid); | |
310 | ||
311 | old_state = proto->state; | |
312 | BUG_ON(old_state >= STATES); | |
313 | BUG_ON(event >= EVENTS); | |
314 | ||
315 | #if DEBUG_STATE | |
316 | printk(KERN_DEBUG "%s: %s ppp_cp_event(%s) %s ...\n", dev->name, | |
317 | proto_name(pid), event_names[event], state_names[proto->state]); | |
318 | #endif | |
319 | ||
320 | action = cp_table[event][old_state]; | |
321 | ||
322 | proto->state = action & STATE_MASK; | |
323 | if (action & (SCR | STR)) /* set Configure-Req/Terminate-Req timer */ | |
324 | mod_timer(&proto->timer, proto->timeout = | |
325 | jiffies + ppp->req_timeout * HZ); | |
326 | if (action & ZRC) | |
327 | proto->restart_counter = 0; | |
328 | if (action & IRC) | |
329 | proto->restart_counter = (proto->state == STOPPING) ? | |
330 | ppp->term_retries : ppp->cr_retries; | |
331 | ||
332 | if (action & SCR) /* send Configure-Request */ | |
333 | ppp_tx_cp(dev, pid, CP_CONF_REQ, proto->cr_id = ++ppp->seq, | |
334 | 0, NULL); | |
335 | if (action & SCA) /* send Configure-Ack */ | |
336 | ppp_tx_cp(dev, pid, CP_CONF_ACK, id, len, data); | |
337 | if (action & SCN) /* send Configure-Nak/Reject */ | |
338 | ppp_tx_cp(dev, pid, code, id, len, data); | |
339 | if (action & STR) /* send Terminate-Request */ | |
340 | ppp_tx_cp(dev, pid, CP_TERM_REQ, ++ppp->seq, 0, NULL); | |
341 | if (action & STA) /* send Terminate-Ack */ | |
342 | ppp_tx_cp(dev, pid, CP_TERM_ACK, id, 0, NULL); | |
343 | if (action & SCJ) /* send Code-Reject */ | |
344 | ppp_tx_cp(dev, pid, CP_CODE_REJ, ++ppp->seq, len, data); | |
345 | ||
346 | if (old_state != OPENED && proto->state == OPENED) { | |
12a3bfef | 347 | netdev_info(dev, "%s up\n", proto_name(pid)); |
e022c2f0 KH |
348 | if (pid == PID_LCP) { |
349 | netif_dormant_off(dev); | |
350 | ppp_cp_event(dev, PID_IPCP, START, 0, 0, 0, NULL); | |
351 | ppp_cp_event(dev, PID_IPV6CP, START, 0, 0, 0, NULL); | |
352 | ppp->last_pong = jiffies; | |
353 | mod_timer(&proto->timer, proto->timeout = | |
354 | jiffies + ppp->keepalive_interval * HZ); | |
355 | } | |
356 | } | |
357 | if (old_state == OPENED && proto->state != OPENED) { | |
12a3bfef | 358 | netdev_info(dev, "%s down\n", proto_name(pid)); |
e022c2f0 KH |
359 | if (pid == PID_LCP) { |
360 | netif_dormant_on(dev); | |
361 | ppp_cp_event(dev, PID_IPCP, STOP, 0, 0, 0, NULL); | |
362 | ppp_cp_event(dev, PID_IPV6CP, STOP, 0, 0, 0, NULL); | |
363 | } | |
364 | } | |
365 | if (old_state != CLOSED && proto->state == CLOSED) | |
366 | del_timer(&proto->timer); | |
367 | ||
368 | #if DEBUG_STATE | |
369 | printk(KERN_DEBUG "%s: %s ppp_cp_event(%s) ... %s\n", dev->name, | |
370 | proto_name(pid), event_names[event], state_names[proto->state]); | |
371 | #endif | |
1da177e4 LT |
372 | } |
373 | ||
374 | ||
e022c2f0 | 375 | static void ppp_cp_parse_cr(struct net_device *dev, u16 pid, u8 id, |
93bc9335 | 376 | unsigned int req_len, const u8 *data) |
e022c2f0 KH |
377 | { |
378 | static u8 const valid_accm[6] = { LCP_OPTION_ACCM, 6, 0, 0, 0, 0 }; | |
93bc9335 KH |
379 | const u8 *opt; |
380 | u8 *out; | |
381 | unsigned int len = req_len, nak_len = 0, rej_len = 0; | |
e022c2f0 KH |
382 | |
383 | if (!(out = kmalloc(len, GFP_ATOMIC))) { | |
384 | dev->stats.rx_dropped++; | |
385 | return; /* out of memory, ignore CR packet */ | |
386 | } | |
387 | ||
388 | for (opt = data; len; len -= opt[1], opt += opt[1]) { | |
389 | if (len < 2 || len < opt[1]) { | |
390 | dev->stats.rx_errors++; | |
966a5d1b | 391 | kfree(out); |
e022c2f0 KH |
392 | return; /* bad packet, drop silently */ |
393 | } | |
394 | ||
395 | if (pid == PID_LCP) | |
396 | switch (opt[0]) { | |
397 | case LCP_OPTION_MRU: | |
398 | continue; /* MRU always OK and > 1500 bytes? */ | |
399 | ||
400 | case LCP_OPTION_ACCM: /* async control character map */ | |
401 | if (!memcmp(opt, valid_accm, | |
402 | sizeof(valid_accm))) | |
403 | continue; | |
404 | if (!rej_len) { /* NAK it */ | |
405 | memcpy(out + nak_len, valid_accm, | |
406 | sizeof(valid_accm)); | |
407 | nak_len += sizeof(valid_accm); | |
408 | continue; | |
409 | } | |
410 | break; | |
411 | case LCP_OPTION_MAGIC: | |
412 | if (opt[1] != 6 || (!opt[2] && !opt[3] && | |
413 | !opt[4] && !opt[5])) | |
414 | break; /* reject invalid magic number */ | |
415 | continue; | |
416 | } | |
417 | /* reject this option */ | |
418 | memcpy(out + rej_len, opt, opt[1]); | |
419 | rej_len += opt[1]; | |
420 | } | |
421 | ||
422 | if (rej_len) | |
423 | ppp_cp_event(dev, pid, RCR_BAD, CP_CONF_REJ, id, rej_len, out); | |
424 | else if (nak_len) | |
425 | ppp_cp_event(dev, pid, RCR_BAD, CP_CONF_NAK, id, nak_len, out); | |
426 | else | |
93bc9335 | 427 | ppp_cp_event(dev, pid, RCR_GOOD, CP_CONF_ACK, id, req_len, data); |
e022c2f0 KH |
428 | |
429 | kfree(out); | |
430 | } | |
431 | ||
432 | static int ppp_rx(struct sk_buff *skb) | |
433 | { | |
434 | struct hdlc_header *hdr = (struct hdlc_header*)skb->data; | |
435 | struct net_device *dev = skb->dev; | |
436 | struct ppp *ppp = get_ppp(dev); | |
437 | struct proto *proto; | |
438 | struct cp_header *cp; | |
439 | unsigned long flags; | |
440 | unsigned int len; | |
441 | u16 pid; | |
442 | #if DEBUG_CP | |
443 | int i; | |
444 | char *ptr; | |
445 | #endif | |
446 | ||
447 | spin_lock_irqsave(&ppp->lock, flags); | |
448 | /* Check HDLC header */ | |
449 | if (skb->len < sizeof(struct hdlc_header)) | |
450 | goto rx_error; | |
451 | cp = (struct cp_header*)skb_pull(skb, sizeof(struct hdlc_header)); | |
452 | if (hdr->address != HDLC_ADDR_ALLSTATIONS || | |
453 | hdr->control != HDLC_CTRL_UI) | |
454 | goto rx_error; | |
455 | ||
456 | pid = ntohs(hdr->protocol); | |
457 | proto = get_proto(dev, pid); | |
458 | if (!proto) { | |
459 | if (ppp->protos[IDX_LCP].state == OPENED) | |
460 | ppp_tx_cp(dev, PID_LCP, LCP_PROTO_REJ, | |
461 | ++ppp->seq, skb->len + 2, &hdr->protocol); | |
462 | goto rx_error; | |
463 | } | |
464 | ||
465 | len = ntohs(cp->len); | |
466 | if (len < sizeof(struct cp_header) /* no complete CP header? */ || | |
467 | skb->len < len /* truncated packet? */) | |
468 | goto rx_error; | |
469 | skb_pull(skb, sizeof(struct cp_header)); | |
470 | len -= sizeof(struct cp_header); | |
471 | ||
472 | /* HDLC and CP headers stripped from skb */ | |
473 | #if DEBUG_CP | |
474 | if (cp->code < CP_CODES) | |
475 | sprintf(debug_buffer, "[%s id 0x%X]", code_names[cp->code], | |
476 | cp->id); | |
477 | else | |
478 | sprintf(debug_buffer, "[code %u id 0x%X]", cp->code, cp->id); | |
479 | ptr = debug_buffer + strlen(debug_buffer); | |
480 | for (i = 0; i < min_t(unsigned int, len, DEBUG_CP); i++) { | |
481 | sprintf(ptr, " %02X", skb->data[i]); | |
482 | ptr += strlen(ptr); | |
483 | } | |
484 | printk(KERN_DEBUG "%s: RX %s %s\n", dev->name, proto_name(pid), | |
485 | debug_buffer); | |
486 | #endif | |
487 | ||
488 | /* LCP only */ | |
489 | if (pid == PID_LCP) | |
490 | switch (cp->code) { | |
491 | case LCP_PROTO_REJ: | |
492 | pid = ntohs(*(__be16*)skb->data); | |
493 | if (pid == PID_LCP || pid == PID_IPCP || | |
494 | pid == PID_IPV6CP) | |
495 | ppp_cp_event(dev, pid, RXJ_BAD, 0, 0, | |
496 | 0, NULL); | |
497 | goto out; | |
498 | ||
499 | case LCP_ECHO_REQ: /* send Echo-Reply */ | |
500 | if (len >= 4 && proto->state == OPENED) | |
501 | ppp_tx_cp(dev, PID_LCP, LCP_ECHO_REPLY, | |
502 | cp->id, len - 4, skb->data + 4); | |
503 | goto out; | |
504 | ||
505 | case LCP_ECHO_REPLY: | |
506 | if (cp->id == ppp->echo_id) | |
507 | ppp->last_pong = jiffies; | |
508 | goto out; | |
509 | ||
510 | case LCP_DISC_REQ: /* discard */ | |
511 | goto out; | |
512 | } | |
513 | ||
514 | /* LCP, IPCP and IPV6CP */ | |
515 | switch (cp->code) { | |
516 | case CP_CONF_REQ: | |
517 | ppp_cp_parse_cr(dev, pid, cp->id, len, skb->data); | |
c8d755b5 | 518 | break; |
e022c2f0 KH |
519 | |
520 | case CP_CONF_ACK: | |
521 | if (cp->id == proto->cr_id) | |
522 | ppp_cp_event(dev, pid, RCA, 0, 0, 0, NULL); | |
c8d755b5 | 523 | break; |
e022c2f0 KH |
524 | |
525 | case CP_CONF_REJ: | |
526 | case CP_CONF_NAK: | |
527 | if (cp->id == proto->cr_id) | |
528 | ppp_cp_event(dev, pid, RCN, 0, 0, 0, NULL); | |
c8d755b5 | 529 | break; |
e022c2f0 KH |
530 | |
531 | case CP_TERM_REQ: | |
532 | ppp_cp_event(dev, pid, RTR, 0, cp->id, 0, NULL); | |
c8d755b5 | 533 | break; |
e022c2f0 KH |
534 | |
535 | case CP_TERM_ACK: | |
536 | ppp_cp_event(dev, pid, RTA, 0, 0, 0, NULL); | |
c8d755b5 | 537 | break; |
e022c2f0 KH |
538 | |
539 | case CP_CODE_REJ: | |
540 | ppp_cp_event(dev, pid, RXJ_BAD, 0, 0, 0, NULL); | |
c8d755b5 | 541 | break; |
e022c2f0 KH |
542 | |
543 | default: | |
544 | len += sizeof(struct cp_header); | |
545 | if (len > dev->mtu) | |
546 | len = dev->mtu; | |
547 | ppp_cp_event(dev, pid, RUC, 0, 0, len, cp); | |
c8d755b5 | 548 | break; |
e022c2f0 KH |
549 | } |
550 | goto out; | |
551 | ||
552 | rx_error: | |
553 | dev->stats.rx_errors++; | |
554 | out: | |
555 | spin_unlock_irqrestore(&ppp->lock, flags); | |
556 | dev_kfree_skb_any(skb); | |
557 | ppp_tx_flush(); | |
558 | return NET_RX_DROP; | |
559 | } | |
560 | ||
e022c2f0 KH |
561 | static void ppp_timer(unsigned long arg) |
562 | { | |
563 | struct proto *proto = (struct proto *)arg; | |
564 | struct ppp *ppp = get_ppp(proto->dev); | |
565 | unsigned long flags; | |
566 | ||
567 | spin_lock_irqsave(&ppp->lock, flags); | |
568 | switch (proto->state) { | |
569 | case STOPPING: | |
570 | case REQ_SENT: | |
571 | case ACK_RECV: | |
572 | case ACK_SENT: | |
573 | if (proto->restart_counter) { | |
574 | ppp_cp_event(proto->dev, proto->pid, TO_GOOD, 0, 0, | |
575 | 0, NULL); | |
576 | proto->restart_counter--; | |
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)) { | |
12a3bfef | 587 | netdev_info(proto->dev, "Link down\n"); |
e022c2f0 KH |
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 | init_timer(&proto->timer); | |
614 | proto->timer.function = ppp_timer; | |
615 | proto->timer.data = (unsigned long)proto; | |
616 | proto->state = CLOSED; | |
617 | } | |
618 | ppp->protos[IDX_LCP].pid = PID_LCP; | |
619 | ppp->protos[IDX_IPCP].pid = PID_IPCP; | |
620 | ppp->protos[IDX_IPV6CP].pid = PID_IPV6CP; | |
621 | ||
622 | ppp_cp_event(dev, PID_LCP, START, 0, 0, 0, NULL); | |
623 | } | |
624 | ||
625 | static void ppp_stop(struct net_device *dev) | |
626 | { | |
627 | ppp_cp_event(dev, PID_LCP, STOP, 0, 0, 0, NULL); | |
628 | } | |
1da177e4 | 629 | |
31f634a6 KH |
630 | static void ppp_close(struct net_device *dev) |
631 | { | |
632 | ppp_tx_flush(); | |
633 | } | |
634 | ||
eb2a2fd9 | 635 | static struct hdlc_proto proto = { |
e022c2f0 KH |
636 | .start = ppp_start, |
637 | .stop = ppp_stop, | |
31f634a6 | 638 | .close = ppp_close, |
eb2a2fd9 KH |
639 | .type_trans = ppp_type_trans, |
640 | .ioctl = ppp_ioctl, | |
e022c2f0 | 641 | .netif_rx = ppp_rx, |
eb2a2fd9 KH |
642 | .module = THIS_MODULE, |
643 | }; | |
644 | ||
e022c2f0 KH |
645 | static const struct header_ops ppp_header_ops = { |
646 | .create = ppp_hard_header, | |
647 | }; | |
eb2a2fd9 KH |
648 | |
649 | static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr) | |
1da177e4 LT |
650 | { |
651 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
e022c2f0 | 652 | struct ppp *ppp; |
1da177e4 LT |
653 | int result; |
654 | ||
655 | switch (ifr->ifr_settings.type) { | |
656 | case IF_GET_PROTO: | |
eb2a2fd9 KH |
657 | if (dev_to_hdlc(dev)->proto != &proto) |
658 | return -EINVAL; | |
1da177e4 LT |
659 | ifr->ifr_settings.type = IF_PROTO_PPP; |
660 | return 0; /* return protocol only, no settable parameters */ | |
661 | ||
662 | case IF_PROTO_PPP: | |
e022c2f0 | 663 | if (!capable(CAP_NET_ADMIN)) |
1da177e4 LT |
664 | return -EPERM; |
665 | ||
e022c2f0 | 666 | if (dev->flags & IFF_UP) |
1da177e4 LT |
667 | return -EBUSY; |
668 | ||
669 | /* no settable parameters */ | |
670 | ||
e022c2f0 | 671 | result = hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT); |
1da177e4 LT |
672 | if (result) |
673 | return result; | |
674 | ||
e022c2f0 | 675 | result = attach_hdlc_protocol(dev, &proto, sizeof(struct ppp)); |
eb2a2fd9 KH |
676 | if (result) |
677 | return result; | |
e022c2f0 KH |
678 | |
679 | ppp = get_ppp(dev); | |
680 | spin_lock_init(&ppp->lock); | |
681 | ppp->req_timeout = 2; | |
682 | ppp->cr_retries = 10; | |
683 | ppp->term_retries = 2; | |
684 | ppp->keepalive_interval = 10; | |
685 | ppp->keepalive_timeout = 60; | |
686 | ||
e022c2f0 KH |
687 | dev->hard_header_len = sizeof(struct hdlc_header); |
688 | dev->header_ops = &ppp_header_ops; | |
1da177e4 | 689 | dev->type = ARPHRD_PPP; |
e022c2f0 | 690 | netif_dormant_on(dev); |
1da177e4 LT |
691 | return 0; |
692 | } | |
693 | ||
694 | return -EINVAL; | |
695 | } | |
eb2a2fd9 KH |
696 | |
697 | ||
698 | static int __init mod_init(void) | |
699 | { | |
e022c2f0 | 700 | skb_queue_head_init(&tx_queue); |
eb2a2fd9 KH |
701 | register_hdlc_protocol(&proto); |
702 | return 0; | |
703 | } | |
704 | ||
eb2a2fd9 KH |
705 | static void __exit mod_exit(void) |
706 | { | |
707 | unregister_hdlc_protocol(&proto); | |
708 | } | |
709 | ||
710 | ||
711 | module_init(mod_init); | |
712 | module_exit(mod_exit); | |
713 | ||
714 | MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); | |
715 | MODULE_DESCRIPTION("PPP protocol support for generic HDLC"); | |
716 | MODULE_LICENSE("GPL v2"); |