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) { | |
226 | printk(KERN_WARNING "%s: out of memory in ppp_tx_cp()\n", | |
227 | dev->name); | |
228 | return; | |
229 | } | |
230 | skb_reserve(skb, sizeof(struct hdlc_header)); | |
231 | ||
232 | cp = (struct cp_header *)skb_put(skb, sizeof(struct cp_header)); | |
233 | cp->code = code; | |
234 | cp->id = id; | |
235 | cp->len = htons(sizeof(struct cp_header) + magic_len + len); | |
236 | ||
237 | if (magic_len) | |
238 | memcpy(skb_put(skb, magic_len), &magic, magic_len); | |
239 | if (len) | |
240 | memcpy(skb_put(skb, len), data, len); | |
241 | ||
242 | #if DEBUG_CP | |
243 | BUG_ON(code >= CP_CODES); | |
244 | ptr = debug_buffer; | |
245 | *ptr = '\x0'; | |
246 | for (i = 0; i < min_t(unsigned int, magic_len + len, DEBUG_CP); i++) { | |
247 | sprintf(ptr, " %02X", skb->data[sizeof(struct cp_header) + i]); | |
248 | ptr += strlen(ptr); | |
249 | } | |
250 | printk(KERN_DEBUG "%s: TX %s [%s id 0x%X]%s\n", dev->name, | |
251 | proto_name(pid), code_names[code], id, debug_buffer); | |
252 | #endif | |
1da177e4 | 253 | |
e022c2f0 | 254 | ppp_hard_header(skb, dev, pid, NULL, NULL, 0); |
3b04ddde | 255 | |
e022c2f0 KH |
256 | skb->priority = TC_PRIO_CONTROL; |
257 | skb->dev = dev; | |
258 | skb_reset_network_header(skb); | |
259 | skb_queue_tail(&tx_queue, skb); | |
1da177e4 LT |
260 | } |
261 | ||
262 | ||
e022c2f0 KH |
263 | /* State transition table (compare STD-51) |
264 | Events Actions | |
265 | TO+ = Timeout with counter > 0 irc = Initialize-Restart-Count | |
266 | TO- = Timeout with counter expired zrc = Zero-Restart-Count | |
267 | ||
268 | RCR+ = Receive-Configure-Request (Good) scr = Send-Configure-Request | |
269 | RCR- = Receive-Configure-Request (Bad) | |
270 | RCA = Receive-Configure-Ack sca = Send-Configure-Ack | |
271 | RCN = Receive-Configure-Nak/Rej scn = Send-Configure-Nak/Rej | |
272 | ||
273 | RTR = Receive-Terminate-Request str = Send-Terminate-Request | |
274 | RTA = Receive-Terminate-Ack sta = Send-Terminate-Ack | |
275 | ||
276 | RUC = Receive-Unknown-Code scj = Send-Code-Reject | |
277 | RXJ+ = Receive-Code-Reject (permitted) | |
278 | or Receive-Protocol-Reject | |
279 | RXJ- = Receive-Code-Reject (catastrophic) | |
280 | or Receive-Protocol-Reject | |
281 | */ | |
282 | static int cp_table[EVENTS][STATES] = { | |
283 | /* CLOSED STOPPED STOPPING REQ_SENT ACK_RECV ACK_SENT OPENED | |
284 | 0 1 2 3 4 5 6 */ | |
285 | {IRC|SCR|3, INV , INV , INV , INV , INV , INV }, /* START */ | |
286 | { INV , 0 , 0 , 0 , 0 , 0 , 0 }, /* STOP */ | |
287 | { INV , INV ,STR|2, SCR|3 ,SCR|3, SCR|5 , INV }, /* TO+ */ | |
288 | { INV , INV , 1 , 1 , 1 , 1 , INV }, /* TO- */ | |
289 | { STA|0 ,IRC|SCR|SCA|5, 2 , SCA|5 ,SCA|6, SCA|5 ,SCR|SCA|5}, /* RCR+ */ | |
290 | { STA|0 ,IRC|SCR|SCN|3, 2 , SCN|3 ,SCN|4, SCN|3 ,SCR|SCN|3}, /* RCR- */ | |
291 | { STA|0 , STA|1 , 2 , IRC|4 ,SCR|3, 6 , SCR|3 }, /* RCA */ | |
292 | { STA|0 , STA|1 , 2 ,IRC|SCR|3,SCR|3,IRC|SCR|5, SCR|3 }, /* RCN */ | |
293 | { STA|0 , STA|1 ,STA|2, STA|3 ,STA|3, STA|3 ,ZRC|STA|2}, /* RTR */ | |
294 | { 0 , 1 , 1 , 3 , 3 , 5 , SCR|3 }, /* RTA */ | |
295 | { SCJ|0 , SCJ|1 ,SCJ|2, SCJ|3 ,SCJ|4, SCJ|5 , SCJ|6 }, /* RUC */ | |
296 | { 0 , 1 , 2 , 3 , 3 , 5 , 6 }, /* RXJ+ */ | |
297 | { 0 , 1 , 1 , 1 , 1 , 1 ,IRC|STR|2}, /* RXJ- */ | |
298 | }; | |
299 | ||
1da177e4 | 300 | |
e022c2f0 KH |
301 | /* SCA: RCR+ must supply id, len and data |
302 | SCN: RCR- must supply code, id, len and data | |
303 | STA: RTR must supply id | |
304 | SCJ: RUC must supply CP packet len and data */ | |
305 | static void ppp_cp_event(struct net_device *dev, u16 pid, u16 event, u8 code, | |
93bc9335 | 306 | u8 id, unsigned int len, const void *data) |
1da177e4 | 307 | { |
e022c2f0 KH |
308 | int old_state, action; |
309 | struct ppp *ppp = get_ppp(dev); | |
310 | struct proto *proto = get_proto(dev, pid); | |
311 | ||
312 | old_state = proto->state; | |
313 | BUG_ON(old_state >= STATES); | |
314 | BUG_ON(event >= EVENTS); | |
315 | ||
316 | #if DEBUG_STATE | |
317 | printk(KERN_DEBUG "%s: %s ppp_cp_event(%s) %s ...\n", dev->name, | |
318 | proto_name(pid), event_names[event], state_names[proto->state]); | |
319 | #endif | |
320 | ||
321 | action = cp_table[event][old_state]; | |
322 | ||
323 | proto->state = action & STATE_MASK; | |
324 | if (action & (SCR | STR)) /* set Configure-Req/Terminate-Req timer */ | |
325 | mod_timer(&proto->timer, proto->timeout = | |
326 | jiffies + ppp->req_timeout * HZ); | |
327 | if (action & ZRC) | |
328 | proto->restart_counter = 0; | |
329 | if (action & IRC) | |
330 | proto->restart_counter = (proto->state == STOPPING) ? | |
331 | ppp->term_retries : ppp->cr_retries; | |
332 | ||
333 | if (action & SCR) /* send Configure-Request */ | |
334 | ppp_tx_cp(dev, pid, CP_CONF_REQ, proto->cr_id = ++ppp->seq, | |
335 | 0, NULL); | |
336 | if (action & SCA) /* send Configure-Ack */ | |
337 | ppp_tx_cp(dev, pid, CP_CONF_ACK, id, len, data); | |
338 | if (action & SCN) /* send Configure-Nak/Reject */ | |
339 | ppp_tx_cp(dev, pid, code, id, len, data); | |
340 | if (action & STR) /* send Terminate-Request */ | |
341 | ppp_tx_cp(dev, pid, CP_TERM_REQ, ++ppp->seq, 0, NULL); | |
342 | if (action & STA) /* send Terminate-Ack */ | |
343 | ppp_tx_cp(dev, pid, CP_TERM_ACK, id, 0, NULL); | |
344 | if (action & SCJ) /* send Code-Reject */ | |
345 | ppp_tx_cp(dev, pid, CP_CODE_REJ, ++ppp->seq, len, data); | |
346 | ||
347 | if (old_state != OPENED && proto->state == OPENED) { | |
348 | printk(KERN_INFO "%s: %s up\n", dev->name, proto_name(pid)); | |
349 | if (pid == PID_LCP) { | |
350 | netif_dormant_off(dev); | |
351 | ppp_cp_event(dev, PID_IPCP, START, 0, 0, 0, NULL); | |
352 | ppp_cp_event(dev, PID_IPV6CP, START, 0, 0, 0, NULL); | |
353 | ppp->last_pong = jiffies; | |
354 | mod_timer(&proto->timer, proto->timeout = | |
355 | jiffies + ppp->keepalive_interval * HZ); | |
356 | } | |
357 | } | |
358 | if (old_state == OPENED && proto->state != OPENED) { | |
359 | printk(KERN_INFO "%s: %s down\n", dev->name, proto_name(pid)); | |
360 | if (pid == PID_LCP) { | |
361 | netif_dormant_on(dev); | |
362 | ppp_cp_event(dev, PID_IPCP, STOP, 0, 0, 0, NULL); | |
363 | ppp_cp_event(dev, PID_IPV6CP, STOP, 0, 0, 0, NULL); | |
364 | } | |
365 | } | |
366 | if (old_state != CLOSED && proto->state == CLOSED) | |
367 | del_timer(&proto->timer); | |
368 | ||
369 | #if DEBUG_STATE | |
370 | printk(KERN_DEBUG "%s: %s ppp_cp_event(%s) ... %s\n", dev->name, | |
371 | proto_name(pid), event_names[event], state_names[proto->state]); | |
372 | #endif | |
1da177e4 LT |
373 | } |
374 | ||
375 | ||
e022c2f0 | 376 | static void ppp_cp_parse_cr(struct net_device *dev, u16 pid, u8 id, |
93bc9335 | 377 | unsigned int req_len, const u8 *data) |
e022c2f0 KH |
378 | { |
379 | static u8 const valid_accm[6] = { LCP_OPTION_ACCM, 6, 0, 0, 0, 0 }; | |
93bc9335 KH |
380 | const u8 *opt; |
381 | u8 *out; | |
382 | unsigned int len = req_len, nak_len = 0, rej_len = 0; | |
e022c2f0 KH |
383 | |
384 | if (!(out = kmalloc(len, GFP_ATOMIC))) { | |
385 | dev->stats.rx_dropped++; | |
386 | return; /* out of memory, ignore CR packet */ | |
387 | } | |
388 | ||
389 | for (opt = data; len; len -= opt[1], opt += opt[1]) { | |
390 | if (len < 2 || len < opt[1]) { | |
391 | dev->stats.rx_errors++; | |
966a5d1b | 392 | kfree(out); |
e022c2f0 KH |
393 | return; /* bad packet, drop silently */ |
394 | } | |
395 | ||
396 | if (pid == PID_LCP) | |
397 | switch (opt[0]) { | |
398 | case LCP_OPTION_MRU: | |
399 | continue; /* MRU always OK and > 1500 bytes? */ | |
400 | ||
401 | case LCP_OPTION_ACCM: /* async control character map */ | |
402 | if (!memcmp(opt, valid_accm, | |
403 | sizeof(valid_accm))) | |
404 | continue; | |
405 | if (!rej_len) { /* NAK it */ | |
406 | memcpy(out + nak_len, valid_accm, | |
407 | sizeof(valid_accm)); | |
408 | nak_len += sizeof(valid_accm); | |
409 | continue; | |
410 | } | |
411 | break; | |
412 | case LCP_OPTION_MAGIC: | |
413 | if (opt[1] != 6 || (!opt[2] && !opt[3] && | |
414 | !opt[4] && !opt[5])) | |
415 | break; /* reject invalid magic number */ | |
416 | continue; | |
417 | } | |
418 | /* reject this option */ | |
419 | memcpy(out + rej_len, opt, opt[1]); | |
420 | rej_len += opt[1]; | |
421 | } | |
422 | ||
423 | if (rej_len) | |
424 | ppp_cp_event(dev, pid, RCR_BAD, CP_CONF_REJ, id, rej_len, out); | |
425 | else if (nak_len) | |
426 | ppp_cp_event(dev, pid, RCR_BAD, CP_CONF_NAK, id, nak_len, out); | |
427 | else | |
93bc9335 | 428 | ppp_cp_event(dev, pid, RCR_GOOD, CP_CONF_ACK, id, req_len, data); |
e022c2f0 KH |
429 | |
430 | kfree(out); | |
431 | } | |
432 | ||
433 | static int ppp_rx(struct sk_buff *skb) | |
434 | { | |
435 | struct hdlc_header *hdr = (struct hdlc_header*)skb->data; | |
436 | struct net_device *dev = skb->dev; | |
437 | struct ppp *ppp = get_ppp(dev); | |
438 | struct proto *proto; | |
439 | struct cp_header *cp; | |
440 | unsigned long flags; | |
441 | unsigned int len; | |
442 | u16 pid; | |
443 | #if DEBUG_CP | |
444 | int i; | |
445 | char *ptr; | |
446 | #endif | |
447 | ||
448 | spin_lock_irqsave(&ppp->lock, flags); | |
449 | /* Check HDLC header */ | |
450 | if (skb->len < sizeof(struct hdlc_header)) | |
451 | goto rx_error; | |
452 | cp = (struct cp_header*)skb_pull(skb, sizeof(struct hdlc_header)); | |
453 | if (hdr->address != HDLC_ADDR_ALLSTATIONS || | |
454 | hdr->control != HDLC_CTRL_UI) | |
455 | goto rx_error; | |
456 | ||
457 | pid = ntohs(hdr->protocol); | |
458 | proto = get_proto(dev, pid); | |
459 | if (!proto) { | |
460 | if (ppp->protos[IDX_LCP].state == OPENED) | |
461 | ppp_tx_cp(dev, PID_LCP, LCP_PROTO_REJ, | |
462 | ++ppp->seq, skb->len + 2, &hdr->protocol); | |
463 | goto rx_error; | |
464 | } | |
465 | ||
466 | len = ntohs(cp->len); | |
467 | if (len < sizeof(struct cp_header) /* no complete CP header? */ || | |
468 | skb->len < len /* truncated packet? */) | |
469 | goto rx_error; | |
470 | skb_pull(skb, sizeof(struct cp_header)); | |
471 | len -= sizeof(struct cp_header); | |
472 | ||
473 | /* HDLC and CP headers stripped from skb */ | |
474 | #if DEBUG_CP | |
475 | if (cp->code < CP_CODES) | |
476 | sprintf(debug_buffer, "[%s id 0x%X]", code_names[cp->code], | |
477 | cp->id); | |
478 | else | |
479 | sprintf(debug_buffer, "[code %u id 0x%X]", cp->code, cp->id); | |
480 | ptr = debug_buffer + strlen(debug_buffer); | |
481 | for (i = 0; i < min_t(unsigned int, len, DEBUG_CP); i++) { | |
482 | sprintf(ptr, " %02X", skb->data[i]); | |
483 | ptr += strlen(ptr); | |
484 | } | |
485 | printk(KERN_DEBUG "%s: RX %s %s\n", dev->name, proto_name(pid), | |
486 | debug_buffer); | |
487 | #endif | |
488 | ||
489 | /* LCP only */ | |
490 | if (pid == PID_LCP) | |
491 | switch (cp->code) { | |
492 | case LCP_PROTO_REJ: | |
493 | pid = ntohs(*(__be16*)skb->data); | |
494 | if (pid == PID_LCP || pid == PID_IPCP || | |
495 | pid == PID_IPV6CP) | |
496 | ppp_cp_event(dev, pid, RXJ_BAD, 0, 0, | |
497 | 0, NULL); | |
498 | goto out; | |
499 | ||
500 | case LCP_ECHO_REQ: /* send Echo-Reply */ | |
501 | if (len >= 4 && proto->state == OPENED) | |
502 | ppp_tx_cp(dev, PID_LCP, LCP_ECHO_REPLY, | |
503 | cp->id, len - 4, skb->data + 4); | |
504 | goto out; | |
505 | ||
506 | case LCP_ECHO_REPLY: | |
507 | if (cp->id == ppp->echo_id) | |
508 | ppp->last_pong = jiffies; | |
509 | goto out; | |
510 | ||
511 | case LCP_DISC_REQ: /* discard */ | |
512 | goto out; | |
513 | } | |
514 | ||
515 | /* LCP, IPCP and IPV6CP */ | |
516 | switch (cp->code) { | |
517 | case CP_CONF_REQ: | |
518 | ppp_cp_parse_cr(dev, pid, cp->id, len, skb->data); | |
519 | goto out; | |
520 | ||
521 | case CP_CONF_ACK: | |
522 | if (cp->id == proto->cr_id) | |
523 | ppp_cp_event(dev, pid, RCA, 0, 0, 0, NULL); | |
524 | goto out; | |
525 | ||
526 | case CP_CONF_REJ: | |
527 | case CP_CONF_NAK: | |
528 | if (cp->id == proto->cr_id) | |
529 | ppp_cp_event(dev, pid, RCN, 0, 0, 0, NULL); | |
530 | goto out; | |
531 | ||
532 | case CP_TERM_REQ: | |
533 | ppp_cp_event(dev, pid, RTR, 0, cp->id, 0, NULL); | |
534 | goto out; | |
535 | ||
536 | case CP_TERM_ACK: | |
537 | ppp_cp_event(dev, pid, RTA, 0, 0, 0, NULL); | |
538 | goto out; | |
539 | ||
540 | case CP_CODE_REJ: | |
541 | ppp_cp_event(dev, pid, RXJ_BAD, 0, 0, 0, NULL); | |
542 | goto out; | |
543 | ||
544 | default: | |
545 | len += sizeof(struct cp_header); | |
546 | if (len > dev->mtu) | |
547 | len = dev->mtu; | |
548 | ppp_cp_event(dev, pid, RUC, 0, 0, len, cp); | |
549 | goto out; | |
550 | } | |
551 | goto out; | |
552 | ||
553 | rx_error: | |
554 | dev->stats.rx_errors++; | |
555 | out: | |
556 | spin_unlock_irqrestore(&ppp->lock, flags); | |
557 | dev_kfree_skb_any(skb); | |
558 | ppp_tx_flush(); | |
559 | return NET_RX_DROP; | |
560 | } | |
561 | ||
e022c2f0 KH |
562 | static void ppp_timer(unsigned long arg) |
563 | { | |
564 | struct proto *proto = (struct proto *)arg; | |
565 | struct ppp *ppp = get_ppp(proto->dev); | |
566 | unsigned long flags; | |
567 | ||
568 | spin_lock_irqsave(&ppp->lock, flags); | |
569 | switch (proto->state) { | |
570 | case STOPPING: | |
571 | case REQ_SENT: | |
572 | case ACK_RECV: | |
573 | case ACK_SENT: | |
574 | if (proto->restart_counter) { | |
575 | ppp_cp_event(proto->dev, proto->pid, TO_GOOD, 0, 0, | |
576 | 0, NULL); | |
577 | proto->restart_counter--; | |
578 | } else | |
579 | ppp_cp_event(proto->dev, proto->pid, TO_BAD, 0, 0, | |
580 | 0, NULL); | |
581 | break; | |
582 | ||
583 | case OPENED: | |
584 | if (proto->pid != PID_LCP) | |
585 | break; | |
586 | if (time_after(jiffies, ppp->last_pong + | |
587 | ppp->keepalive_timeout * HZ)) { | |
588 | printk(KERN_INFO "%s: Link down\n", proto->dev->name); | |
589 | ppp_cp_event(proto->dev, PID_LCP, STOP, 0, 0, 0, NULL); | |
590 | ppp_cp_event(proto->dev, PID_LCP, START, 0, 0, 0, NULL); | |
591 | } else { /* send keep-alive packet */ | |
592 | ppp->echo_id = ++ppp->seq; | |
593 | ppp_tx_cp(proto->dev, PID_LCP, LCP_ECHO_REQ, | |
594 | ppp->echo_id, 0, NULL); | |
595 | proto->timer.expires = jiffies + | |
596 | ppp->keepalive_interval * HZ; | |
597 | add_timer(&proto->timer); | |
598 | } | |
599 | break; | |
600 | } | |
601 | spin_unlock_irqrestore(&ppp->lock, flags); | |
602 | ppp_tx_flush(); | |
603 | } | |
604 | ||
605 | ||
606 | static void ppp_start(struct net_device *dev) | |
607 | { | |
608 | struct ppp *ppp = get_ppp(dev); | |
609 | int i; | |
610 | ||
611 | for (i = 0; i < IDX_COUNT; i++) { | |
612 | struct proto *proto = &ppp->protos[i]; | |
613 | proto->dev = dev; | |
614 | init_timer(&proto->timer); | |
615 | proto->timer.function = ppp_timer; | |
616 | proto->timer.data = (unsigned long)proto; | |
617 | proto->state = CLOSED; | |
618 | } | |
619 | ppp->protos[IDX_LCP].pid = PID_LCP; | |
620 | ppp->protos[IDX_IPCP].pid = PID_IPCP; | |
621 | ppp->protos[IDX_IPV6CP].pid = PID_IPV6CP; | |
622 | ||
623 | ppp_cp_event(dev, PID_LCP, START, 0, 0, 0, NULL); | |
624 | } | |
625 | ||
626 | static void ppp_stop(struct net_device *dev) | |
627 | { | |
628 | ppp_cp_event(dev, PID_LCP, STOP, 0, 0, 0, NULL); | |
629 | } | |
1da177e4 | 630 | |
eb2a2fd9 | 631 | static struct hdlc_proto proto = { |
e022c2f0 KH |
632 | .start = ppp_start, |
633 | .stop = ppp_stop, | |
eb2a2fd9 KH |
634 | .type_trans = ppp_type_trans, |
635 | .ioctl = ppp_ioctl, | |
e022c2f0 | 636 | .netif_rx = ppp_rx, |
eb2a2fd9 KH |
637 | .module = THIS_MODULE, |
638 | }; | |
639 | ||
e022c2f0 KH |
640 | static const struct header_ops ppp_header_ops = { |
641 | .create = ppp_hard_header, | |
642 | }; | |
eb2a2fd9 KH |
643 | |
644 | static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr) | |
1da177e4 LT |
645 | { |
646 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
e022c2f0 | 647 | struct ppp *ppp; |
1da177e4 LT |
648 | int result; |
649 | ||
650 | switch (ifr->ifr_settings.type) { | |
651 | case IF_GET_PROTO: | |
eb2a2fd9 KH |
652 | if (dev_to_hdlc(dev)->proto != &proto) |
653 | return -EINVAL; | |
1da177e4 LT |
654 | ifr->ifr_settings.type = IF_PROTO_PPP; |
655 | return 0; /* return protocol only, no settable parameters */ | |
656 | ||
657 | case IF_PROTO_PPP: | |
e022c2f0 | 658 | if (!capable(CAP_NET_ADMIN)) |
1da177e4 LT |
659 | return -EPERM; |
660 | ||
e022c2f0 | 661 | if (dev->flags & IFF_UP) |
1da177e4 LT |
662 | return -EBUSY; |
663 | ||
664 | /* no settable parameters */ | |
665 | ||
e022c2f0 | 666 | result = hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT); |
1da177e4 LT |
667 | if (result) |
668 | return result; | |
669 | ||
e022c2f0 | 670 | result = attach_hdlc_protocol(dev, &proto, sizeof(struct ppp)); |
eb2a2fd9 KH |
671 | if (result) |
672 | return result; | |
e022c2f0 KH |
673 | |
674 | ppp = get_ppp(dev); | |
675 | spin_lock_init(&ppp->lock); | |
676 | ppp->req_timeout = 2; | |
677 | ppp->cr_retries = 10; | |
678 | ppp->term_retries = 2; | |
679 | ppp->keepalive_interval = 10; | |
680 | ppp->keepalive_timeout = 60; | |
681 | ||
e022c2f0 KH |
682 | dev->hard_header_len = sizeof(struct hdlc_header); |
683 | dev->header_ops = &ppp_header_ops; | |
1da177e4 | 684 | dev->type = ARPHRD_PPP; |
e022c2f0 | 685 | netif_dormant_on(dev); |
1da177e4 LT |
686 | return 0; |
687 | } | |
688 | ||
689 | return -EINVAL; | |
690 | } | |
eb2a2fd9 KH |
691 | |
692 | ||
693 | static int __init mod_init(void) | |
694 | { | |
e022c2f0 | 695 | skb_queue_head_init(&tx_queue); |
eb2a2fd9 KH |
696 | register_hdlc_protocol(&proto); |
697 | return 0; | |
698 | } | |
699 | ||
eb2a2fd9 KH |
700 | static void __exit mod_exit(void) |
701 | { | |
702 | unregister_hdlc_protocol(&proto); | |
703 | } | |
704 | ||
705 | ||
706 | module_init(mod_init); | |
707 | module_exit(mod_exit); | |
708 | ||
709 | MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); | |
710 | MODULE_DESCRIPTION("PPP protocol support for generic HDLC"); | |
711 | MODULE_LICENSE("GPL v2"); |