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1da177e4 LT |
1 | /* |
2 | * Generic PPP layer for Linux. | |
3 | * | |
4 | * Copyright 1999-2002 Paul Mackerras. | |
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 | * The generic PPP layer handles the PPP network interfaces, the | |
12 | * /dev/ppp device, packet and VJ compression, and multilink. | |
13 | * It talks to PPP `channels' via the interface defined in | |
14 | * include/linux/ppp_channel.h. Channels provide the basic means for | |
15 | * sending and receiving PPP frames on some kind of communications | |
16 | * channel. | |
17 | * | |
18 | * Part of the code in this driver was inspired by the old async-only | |
19 | * PPP driver, written by Michael Callahan and Al Longyear, and | |
20 | * subsequently hacked by Paul Mackerras. | |
21 | * | |
22 | * ==FILEVERSION 20041108== | |
23 | */ | |
24 | ||
1da177e4 LT |
25 | #include <linux/module.h> |
26 | #include <linux/kernel.h> | |
27 | #include <linux/kmod.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/list.h> | |
1da177e4 LT |
30 | #include <linux/netdevice.h> |
31 | #include <linux/poll.h> | |
32 | #include <linux/ppp_defs.h> | |
33 | #include <linux/filter.h> | |
34 | #include <linux/if_ppp.h> | |
35 | #include <linux/ppp_channel.h> | |
36 | #include <linux/ppp-comp.h> | |
37 | #include <linux/skbuff.h> | |
38 | #include <linux/rtnetlink.h> | |
39 | #include <linux/if_arp.h> | |
40 | #include <linux/ip.h> | |
41 | #include <linux/tcp.h> | |
42 | #include <linux/spinlock.h> | |
43 | #include <linux/smp_lock.h> | |
44 | #include <linux/rwsem.h> | |
45 | #include <linux/stddef.h> | |
46 | #include <linux/device.h> | |
8ed965d6 | 47 | #include <linux/mutex.h> |
1da177e4 LT |
48 | #include <net/slhc_vj.h> |
49 | #include <asm/atomic.h> | |
50 | ||
51 | #define PPP_VERSION "2.4.2" | |
52 | ||
53 | /* | |
54 | * Network protocols we support. | |
55 | */ | |
56 | #define NP_IP 0 /* Internet Protocol V4 */ | |
57 | #define NP_IPV6 1 /* Internet Protocol V6 */ | |
58 | #define NP_IPX 2 /* IPX protocol */ | |
59 | #define NP_AT 3 /* Appletalk protocol */ | |
60 | #define NP_MPLS_UC 4 /* MPLS unicast */ | |
61 | #define NP_MPLS_MC 5 /* MPLS multicast */ | |
62 | #define NUM_NP 6 /* Number of NPs. */ | |
63 | ||
64 | #define MPHDRLEN 6 /* multilink protocol header length */ | |
65 | #define MPHDRLEN_SSN 4 /* ditto with short sequence numbers */ | |
66 | #define MIN_FRAG_SIZE 64 | |
67 | ||
68 | /* | |
69 | * An instance of /dev/ppp can be associated with either a ppp | |
70 | * interface unit or a ppp channel. In both cases, file->private_data | |
71 | * points to one of these. | |
72 | */ | |
73 | struct ppp_file { | |
74 | enum { | |
75 | INTERFACE=1, CHANNEL | |
76 | } kind; | |
77 | struct sk_buff_head xq; /* pppd transmit queue */ | |
78 | struct sk_buff_head rq; /* receive queue for pppd */ | |
79 | wait_queue_head_t rwait; /* for poll on reading /dev/ppp */ | |
80 | atomic_t refcnt; /* # refs (incl /dev/ppp attached) */ | |
81 | int hdrlen; /* space to leave for headers */ | |
82 | int index; /* interface unit / channel number */ | |
83 | int dead; /* unit/channel has been shut down */ | |
84 | }; | |
85 | ||
b385a144 | 86 | #define PF_TO_X(pf, X) container_of(pf, X, file) |
1da177e4 LT |
87 | |
88 | #define PF_TO_PPP(pf) PF_TO_X(pf, struct ppp) | |
89 | #define PF_TO_CHANNEL(pf) PF_TO_X(pf, struct channel) | |
90 | ||
1da177e4 LT |
91 | /* |
92 | * Data structure describing one ppp unit. | |
93 | * A ppp unit corresponds to a ppp network interface device | |
94 | * and represents a multilink bundle. | |
95 | * It can have 0 or more ppp channels connected to it. | |
96 | */ | |
97 | struct ppp { | |
98 | struct ppp_file file; /* stuff for read/write/poll 0 */ | |
99 | struct file *owner; /* file that owns this unit 48 */ | |
100 | struct list_head channels; /* list of attached channels 4c */ | |
101 | int n_channels; /* how many channels are attached 54 */ | |
102 | spinlock_t rlock; /* lock for receive side 58 */ | |
103 | spinlock_t wlock; /* lock for transmit side 5c */ | |
104 | int mru; /* max receive unit 60 */ | |
105 | unsigned int flags; /* control bits 64 */ | |
106 | unsigned int xstate; /* transmit state bits 68 */ | |
107 | unsigned int rstate; /* receive state bits 6c */ | |
108 | int debug; /* debug flags 70 */ | |
109 | struct slcompress *vj; /* state for VJ header compression */ | |
110 | enum NPmode npmode[NUM_NP]; /* what to do with each net proto 78 */ | |
111 | struct sk_buff *xmit_pending; /* a packet ready to go out 88 */ | |
112 | struct compressor *xcomp; /* transmit packet compressor 8c */ | |
113 | void *xc_state; /* its internal state 90 */ | |
114 | struct compressor *rcomp; /* receive decompressor 94 */ | |
115 | void *rc_state; /* its internal state 98 */ | |
116 | unsigned long last_xmit; /* jiffies when last pkt sent 9c */ | |
117 | unsigned long last_recv; /* jiffies when last pkt rcvd a0 */ | |
118 | struct net_device *dev; /* network interface device a4 */ | |
119 | #ifdef CONFIG_PPP_MULTILINK | |
120 | int nxchan; /* next channel to send something on */ | |
121 | u32 nxseq; /* next sequence number to send */ | |
122 | int mrru; /* MP: max reconst. receive unit */ | |
123 | u32 nextseq; /* MP: seq no of next packet */ | |
124 | u32 minseq; /* MP: min of most recent seqnos */ | |
125 | struct sk_buff_head mrq; /* MP: receive reconstruction queue */ | |
126 | #endif /* CONFIG_PPP_MULTILINK */ | |
127 | struct net_device_stats stats; /* statistics */ | |
128 | #ifdef CONFIG_PPP_FILTER | |
129 | struct sock_filter *pass_filter; /* filter for packets to pass */ | |
130 | struct sock_filter *active_filter;/* filter for pkts to reset idle */ | |
131 | unsigned pass_len, active_len; | |
132 | #endif /* CONFIG_PPP_FILTER */ | |
133 | }; | |
134 | ||
135 | /* | |
136 | * Bits in flags: SC_NO_TCP_CCID, SC_CCP_OPEN, SC_CCP_UP, SC_LOOP_TRAFFIC, | |
b3f9b92a MD |
137 | * SC_MULTILINK, SC_MP_SHORTSEQ, SC_MP_XSHORTSEQ, SC_COMP_TCP, SC_REJ_COMP_TCP, |
138 | * SC_MUST_COMP | |
1da177e4 LT |
139 | * Bits in rstate: SC_DECOMP_RUN, SC_DC_ERROR, SC_DC_FERROR. |
140 | * Bits in xstate: SC_COMP_RUN | |
141 | */ | |
142 | #define SC_FLAG_BITS (SC_NO_TCP_CCID|SC_CCP_OPEN|SC_CCP_UP|SC_LOOP_TRAFFIC \ | |
143 | |SC_MULTILINK|SC_MP_SHORTSEQ|SC_MP_XSHORTSEQ \ | |
b3f9b92a | 144 | |SC_COMP_TCP|SC_REJ_COMP_TCP|SC_MUST_COMP) |
1da177e4 LT |
145 | |
146 | /* | |
147 | * Private data structure for each channel. | |
148 | * This includes the data structure used for multilink. | |
149 | */ | |
150 | struct channel { | |
151 | struct ppp_file file; /* stuff for read/write/poll */ | |
152 | struct list_head list; /* link in all/new_channels list */ | |
153 | struct ppp_channel *chan; /* public channel data structure */ | |
154 | struct rw_semaphore chan_sem; /* protects `chan' during chan ioctl */ | |
155 | spinlock_t downl; /* protects `chan', file.xq dequeue */ | |
156 | struct ppp *ppp; /* ppp unit we're connected to */ | |
157 | struct list_head clist; /* link in list of channels per unit */ | |
158 | rwlock_t upl; /* protects `ppp' */ | |
159 | #ifdef CONFIG_PPP_MULTILINK | |
160 | u8 avail; /* flag used in multilink stuff */ | |
161 | u8 had_frag; /* >= 1 fragments have been sent */ | |
162 | u32 lastseq; /* MP: last sequence # received */ | |
163 | #endif /* CONFIG_PPP_MULTILINK */ | |
164 | }; | |
165 | ||
166 | /* | |
167 | * SMP locking issues: | |
168 | * Both the ppp.rlock and ppp.wlock locks protect the ppp.channels | |
169 | * list and the ppp.n_channels field, you need to take both locks | |
170 | * before you modify them. | |
171 | * The lock ordering is: channel.upl -> ppp.wlock -> ppp.rlock -> | |
172 | * channel.downl. | |
173 | */ | |
174 | ||
175 | /* | |
176 | * A cardmap represents a mapping from unsigned integers to pointers, | |
177 | * and provides a fast "find lowest unused number" operation. | |
178 | * It uses a broad (32-way) tree with a bitmap at each level. | |
179 | * It is designed to be space-efficient for small numbers of entries | |
180 | * and time-efficient for large numbers of entries. | |
181 | */ | |
182 | #define CARDMAP_ORDER 5 | |
183 | #define CARDMAP_WIDTH (1U << CARDMAP_ORDER) | |
184 | #define CARDMAP_MASK (CARDMAP_WIDTH - 1) | |
185 | ||
186 | struct cardmap { | |
187 | int shift; | |
188 | unsigned long inuse; | |
189 | struct cardmap *parent; | |
190 | void *ptr[CARDMAP_WIDTH]; | |
191 | }; | |
192 | static void *cardmap_get(struct cardmap *map, unsigned int nr); | |
d4274b51 | 193 | static int cardmap_set(struct cardmap **map, unsigned int nr, void *ptr); |
1da177e4 LT |
194 | static unsigned int cardmap_find_first_free(struct cardmap *map); |
195 | static void cardmap_destroy(struct cardmap **map); | |
196 | ||
197 | /* | |
8ed965d6 | 198 | * all_ppp_mutex protects the all_ppp_units mapping. |
1da177e4 LT |
199 | * It also ensures that finding a ppp unit in the all_ppp_units map |
200 | * and updating its file.refcnt field is atomic. | |
201 | */ | |
8ed965d6 | 202 | static DEFINE_MUTEX(all_ppp_mutex); |
1da177e4 LT |
203 | static struct cardmap *all_ppp_units; |
204 | static atomic_t ppp_unit_count = ATOMIC_INIT(0); | |
205 | ||
206 | /* | |
207 | * all_channels_lock protects all_channels and last_channel_index, | |
208 | * and the atomicity of find a channel and updating its file.refcnt | |
209 | * field. | |
210 | */ | |
211 | static DEFINE_SPINLOCK(all_channels_lock); | |
212 | static LIST_HEAD(all_channels); | |
213 | static LIST_HEAD(new_channels); | |
214 | static int last_channel_index; | |
215 | static atomic_t channel_count = ATOMIC_INIT(0); | |
216 | ||
217 | /* Get the PPP protocol number from a skb */ | |
218 | #define PPP_PROTO(skb) (((skb)->data[0] << 8) + (skb)->data[1]) | |
219 | ||
220 | /* We limit the length of ppp->file.rq to this (arbitrary) value */ | |
221 | #define PPP_MAX_RQLEN 32 | |
222 | ||
223 | /* | |
224 | * Maximum number of multilink fragments queued up. | |
225 | * This has to be large enough to cope with the maximum latency of | |
226 | * the slowest channel relative to the others. Strictly it should | |
227 | * depend on the number of channels and their characteristics. | |
228 | */ | |
229 | #define PPP_MP_MAX_QLEN 128 | |
230 | ||
231 | /* Multilink header bits. */ | |
232 | #define B 0x80 /* this fragment begins a packet */ | |
233 | #define E 0x40 /* this fragment ends a packet */ | |
234 | ||
235 | /* Compare multilink sequence numbers (assumed to be 32 bits wide) */ | |
236 | #define seq_before(a, b) ((s32)((a) - (b)) < 0) | |
237 | #define seq_after(a, b) ((s32)((a) - (b)) > 0) | |
238 | ||
239 | /* Prototypes. */ | |
240 | static int ppp_unattached_ioctl(struct ppp_file *pf, struct file *file, | |
241 | unsigned int cmd, unsigned long arg); | |
242 | static void ppp_xmit_process(struct ppp *ppp); | |
243 | static void ppp_send_frame(struct ppp *ppp, struct sk_buff *skb); | |
244 | static void ppp_push(struct ppp *ppp); | |
245 | static void ppp_channel_push(struct channel *pch); | |
246 | static void ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, | |
247 | struct channel *pch); | |
248 | static void ppp_receive_error(struct ppp *ppp); | |
249 | static void ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb); | |
250 | static struct sk_buff *ppp_decompress_frame(struct ppp *ppp, | |
251 | struct sk_buff *skb); | |
252 | #ifdef CONFIG_PPP_MULTILINK | |
253 | static void ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, | |
254 | struct channel *pch); | |
255 | static void ppp_mp_insert(struct ppp *ppp, struct sk_buff *skb); | |
256 | static struct sk_buff *ppp_mp_reconstruct(struct ppp *ppp); | |
257 | static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb); | |
258 | #endif /* CONFIG_PPP_MULTILINK */ | |
259 | static int ppp_set_compress(struct ppp *ppp, unsigned long arg); | |
260 | static void ppp_ccp_peek(struct ppp *ppp, struct sk_buff *skb, int inbound); | |
261 | static void ppp_ccp_closed(struct ppp *ppp); | |
262 | static struct compressor *find_compressor(int type); | |
263 | static void ppp_get_stats(struct ppp *ppp, struct ppp_stats *st); | |
264 | static struct ppp *ppp_create_interface(int unit, int *retp); | |
265 | static void init_ppp_file(struct ppp_file *pf, int kind); | |
266 | static void ppp_shutdown_interface(struct ppp *ppp); | |
267 | static void ppp_destroy_interface(struct ppp *ppp); | |
268 | static struct ppp *ppp_find_unit(int unit); | |
269 | static struct channel *ppp_find_channel(int unit); | |
270 | static int ppp_connect_channel(struct channel *pch, int unit); | |
271 | static int ppp_disconnect_channel(struct channel *pch); | |
272 | static void ppp_destroy_channel(struct channel *pch); | |
273 | ||
56b22935 | 274 | static struct class *ppp_class; |
1da177e4 LT |
275 | |
276 | /* Translates a PPP protocol number to a NP index (NP == network protocol) */ | |
277 | static inline int proto_to_npindex(int proto) | |
278 | { | |
279 | switch (proto) { | |
280 | case PPP_IP: | |
281 | return NP_IP; | |
282 | case PPP_IPV6: | |
283 | return NP_IPV6; | |
284 | case PPP_IPX: | |
285 | return NP_IPX; | |
286 | case PPP_AT: | |
287 | return NP_AT; | |
288 | case PPP_MPLS_UC: | |
289 | return NP_MPLS_UC; | |
290 | case PPP_MPLS_MC: | |
291 | return NP_MPLS_MC; | |
292 | } | |
293 | return -EINVAL; | |
294 | } | |
295 | ||
296 | /* Translates an NP index into a PPP protocol number */ | |
297 | static const int npindex_to_proto[NUM_NP] = { | |
298 | PPP_IP, | |
299 | PPP_IPV6, | |
300 | PPP_IPX, | |
301 | PPP_AT, | |
302 | PPP_MPLS_UC, | |
303 | PPP_MPLS_MC, | |
304 | }; | |
6aa20a22 | 305 | |
1da177e4 LT |
306 | /* Translates an ethertype into an NP index */ |
307 | static inline int ethertype_to_npindex(int ethertype) | |
308 | { | |
309 | switch (ethertype) { | |
310 | case ETH_P_IP: | |
311 | return NP_IP; | |
312 | case ETH_P_IPV6: | |
313 | return NP_IPV6; | |
314 | case ETH_P_IPX: | |
315 | return NP_IPX; | |
316 | case ETH_P_PPPTALK: | |
317 | case ETH_P_ATALK: | |
318 | return NP_AT; | |
319 | case ETH_P_MPLS_UC: | |
320 | return NP_MPLS_UC; | |
321 | case ETH_P_MPLS_MC: | |
322 | return NP_MPLS_MC; | |
323 | } | |
324 | return -1; | |
325 | } | |
326 | ||
327 | /* Translates an NP index into an ethertype */ | |
328 | static const int npindex_to_ethertype[NUM_NP] = { | |
329 | ETH_P_IP, | |
330 | ETH_P_IPV6, | |
331 | ETH_P_IPX, | |
332 | ETH_P_PPPTALK, | |
333 | ETH_P_MPLS_UC, | |
334 | ETH_P_MPLS_MC, | |
335 | }; | |
336 | ||
337 | /* | |
338 | * Locking shorthand. | |
339 | */ | |
340 | #define ppp_xmit_lock(ppp) spin_lock_bh(&(ppp)->wlock) | |
341 | #define ppp_xmit_unlock(ppp) spin_unlock_bh(&(ppp)->wlock) | |
342 | #define ppp_recv_lock(ppp) spin_lock_bh(&(ppp)->rlock) | |
343 | #define ppp_recv_unlock(ppp) spin_unlock_bh(&(ppp)->rlock) | |
344 | #define ppp_lock(ppp) do { ppp_xmit_lock(ppp); \ | |
345 | ppp_recv_lock(ppp); } while (0) | |
346 | #define ppp_unlock(ppp) do { ppp_recv_unlock(ppp); \ | |
347 | ppp_xmit_unlock(ppp); } while (0) | |
348 | ||
349 | /* | |
350 | * /dev/ppp device routines. | |
351 | * The /dev/ppp device is used by pppd to control the ppp unit. | |
352 | * It supports the read, write, ioctl and poll functions. | |
353 | * Open instances of /dev/ppp can be in one of three states: | |
354 | * unattached, attached to a ppp unit, or attached to a ppp channel. | |
355 | */ | |
356 | static int ppp_open(struct inode *inode, struct file *file) | |
357 | { | |
358 | /* | |
359 | * This could (should?) be enforced by the permissions on /dev/ppp. | |
360 | */ | |
361 | if (!capable(CAP_NET_ADMIN)) | |
362 | return -EPERM; | |
363 | return 0; | |
364 | } | |
365 | ||
366 | static int ppp_release(struct inode *inode, struct file *file) | |
367 | { | |
368 | struct ppp_file *pf = file->private_data; | |
369 | struct ppp *ppp; | |
370 | ||
371 | if (pf != 0) { | |
372 | file->private_data = NULL; | |
373 | if (pf->kind == INTERFACE) { | |
374 | ppp = PF_TO_PPP(pf); | |
375 | if (file == ppp->owner) | |
376 | ppp_shutdown_interface(ppp); | |
377 | } | |
378 | if (atomic_dec_and_test(&pf->refcnt)) { | |
379 | switch (pf->kind) { | |
380 | case INTERFACE: | |
381 | ppp_destroy_interface(PF_TO_PPP(pf)); | |
382 | break; | |
383 | case CHANNEL: | |
384 | ppp_destroy_channel(PF_TO_CHANNEL(pf)); | |
385 | break; | |
386 | } | |
387 | } | |
388 | } | |
389 | return 0; | |
390 | } | |
391 | ||
392 | static ssize_t ppp_read(struct file *file, char __user *buf, | |
393 | size_t count, loff_t *ppos) | |
394 | { | |
395 | struct ppp_file *pf = file->private_data; | |
396 | DECLARE_WAITQUEUE(wait, current); | |
397 | ssize_t ret; | |
398 | struct sk_buff *skb = NULL; | |
399 | ||
400 | ret = count; | |
401 | ||
402 | if (pf == 0) | |
403 | return -ENXIO; | |
404 | add_wait_queue(&pf->rwait, &wait); | |
405 | for (;;) { | |
406 | set_current_state(TASK_INTERRUPTIBLE); | |
407 | skb = skb_dequeue(&pf->rq); | |
408 | if (skb) | |
409 | break; | |
410 | ret = 0; | |
411 | if (pf->dead) | |
412 | break; | |
413 | if (pf->kind == INTERFACE) { | |
414 | /* | |
415 | * Return 0 (EOF) on an interface that has no | |
416 | * channels connected, unless it is looping | |
417 | * network traffic (demand mode). | |
418 | */ | |
419 | struct ppp *ppp = PF_TO_PPP(pf); | |
420 | if (ppp->n_channels == 0 | |
421 | && (ppp->flags & SC_LOOP_TRAFFIC) == 0) | |
422 | break; | |
423 | } | |
424 | ret = -EAGAIN; | |
425 | if (file->f_flags & O_NONBLOCK) | |
426 | break; | |
427 | ret = -ERESTARTSYS; | |
428 | if (signal_pending(current)) | |
429 | break; | |
430 | schedule(); | |
431 | } | |
432 | set_current_state(TASK_RUNNING); | |
433 | remove_wait_queue(&pf->rwait, &wait); | |
434 | ||
435 | if (skb == 0) | |
436 | goto out; | |
437 | ||
438 | ret = -EOVERFLOW; | |
439 | if (skb->len > count) | |
440 | goto outf; | |
441 | ret = -EFAULT; | |
442 | if (copy_to_user(buf, skb->data, skb->len)) | |
443 | goto outf; | |
444 | ret = skb->len; | |
445 | ||
446 | outf: | |
447 | kfree_skb(skb); | |
448 | out: | |
449 | return ret; | |
450 | } | |
451 | ||
452 | static ssize_t ppp_write(struct file *file, const char __user *buf, | |
453 | size_t count, loff_t *ppos) | |
454 | { | |
455 | struct ppp_file *pf = file->private_data; | |
456 | struct sk_buff *skb; | |
457 | ssize_t ret; | |
458 | ||
459 | if (pf == 0) | |
460 | return -ENXIO; | |
461 | ret = -ENOMEM; | |
462 | skb = alloc_skb(count + pf->hdrlen, GFP_KERNEL); | |
463 | if (skb == 0) | |
464 | goto out; | |
465 | skb_reserve(skb, pf->hdrlen); | |
466 | ret = -EFAULT; | |
467 | if (copy_from_user(skb_put(skb, count), buf, count)) { | |
468 | kfree_skb(skb); | |
469 | goto out; | |
470 | } | |
471 | ||
472 | skb_queue_tail(&pf->xq, skb); | |
473 | ||
474 | switch (pf->kind) { | |
475 | case INTERFACE: | |
476 | ppp_xmit_process(PF_TO_PPP(pf)); | |
477 | break; | |
478 | case CHANNEL: | |
479 | ppp_channel_push(PF_TO_CHANNEL(pf)); | |
480 | break; | |
481 | } | |
482 | ||
483 | ret = count; | |
484 | ||
485 | out: | |
486 | return ret; | |
487 | } | |
488 | ||
489 | /* No kernel lock - fine */ | |
490 | static unsigned int ppp_poll(struct file *file, poll_table *wait) | |
491 | { | |
492 | struct ppp_file *pf = file->private_data; | |
493 | unsigned int mask; | |
494 | ||
495 | if (pf == 0) | |
496 | return 0; | |
497 | poll_wait(file, &pf->rwait, wait); | |
498 | mask = POLLOUT | POLLWRNORM; | |
499 | if (skb_peek(&pf->rq) != 0) | |
500 | mask |= POLLIN | POLLRDNORM; | |
501 | if (pf->dead) | |
502 | mask |= POLLHUP; | |
503 | else if (pf->kind == INTERFACE) { | |
504 | /* see comment in ppp_read */ | |
505 | struct ppp *ppp = PF_TO_PPP(pf); | |
506 | if (ppp->n_channels == 0 | |
507 | && (ppp->flags & SC_LOOP_TRAFFIC) == 0) | |
508 | mask |= POLLIN | POLLRDNORM; | |
509 | } | |
510 | ||
511 | return mask; | |
512 | } | |
513 | ||
514 | #ifdef CONFIG_PPP_FILTER | |
515 | static int get_filter(void __user *arg, struct sock_filter **p) | |
516 | { | |
517 | struct sock_fprog uprog; | |
518 | struct sock_filter *code = NULL; | |
519 | int len, err; | |
520 | ||
521 | if (copy_from_user(&uprog, arg, sizeof(uprog))) | |
522 | return -EFAULT; | |
523 | ||
1da177e4 LT |
524 | if (!uprog.len) { |
525 | *p = NULL; | |
526 | return 0; | |
527 | } | |
528 | ||
529 | len = uprog.len * sizeof(struct sock_filter); | |
530 | code = kmalloc(len, GFP_KERNEL); | |
531 | if (code == NULL) | |
532 | return -ENOMEM; | |
533 | ||
534 | if (copy_from_user(code, uprog.filter, len)) { | |
535 | kfree(code); | |
536 | return -EFAULT; | |
537 | } | |
538 | ||
539 | err = sk_chk_filter(code, uprog.len); | |
540 | if (err) { | |
541 | kfree(code); | |
542 | return err; | |
543 | } | |
544 | ||
545 | *p = code; | |
546 | return uprog.len; | |
547 | } | |
548 | #endif /* CONFIG_PPP_FILTER */ | |
549 | ||
550 | static int ppp_ioctl(struct inode *inode, struct file *file, | |
551 | unsigned int cmd, unsigned long arg) | |
552 | { | |
553 | struct ppp_file *pf = file->private_data; | |
554 | struct ppp *ppp; | |
555 | int err = -EFAULT, val, val2, i; | |
556 | struct ppp_idle idle; | |
557 | struct npioctl npi; | |
558 | int unit, cflags; | |
559 | struct slcompress *vj; | |
560 | void __user *argp = (void __user *)arg; | |
561 | int __user *p = argp; | |
562 | ||
563 | if (pf == 0) | |
564 | return ppp_unattached_ioctl(pf, file, cmd, arg); | |
565 | ||
566 | if (cmd == PPPIOCDETACH) { | |
567 | /* | |
568 | * We have to be careful here... if the file descriptor | |
569 | * has been dup'd, we could have another process in the | |
570 | * middle of a poll using the same file *, so we had | |
571 | * better not free the interface data structures - | |
572 | * instead we fail the ioctl. Even in this case, we | |
573 | * shut down the interface if we are the owner of it. | |
574 | * Actually, we should get rid of PPPIOCDETACH, userland | |
575 | * (i.e. pppd) could achieve the same effect by closing | |
576 | * this fd and reopening /dev/ppp. | |
577 | */ | |
578 | err = -EINVAL; | |
579 | if (pf->kind == INTERFACE) { | |
580 | ppp = PF_TO_PPP(pf); | |
581 | if (file == ppp->owner) | |
582 | ppp_shutdown_interface(ppp); | |
583 | } | |
584 | if (atomic_read(&file->f_count) <= 2) { | |
585 | ppp_release(inode, file); | |
586 | err = 0; | |
587 | } else | |
588 | printk(KERN_DEBUG "PPPIOCDETACH file->f_count=%d\n", | |
589 | atomic_read(&file->f_count)); | |
590 | return err; | |
591 | } | |
592 | ||
593 | if (pf->kind == CHANNEL) { | |
594 | struct channel *pch = PF_TO_CHANNEL(pf); | |
595 | struct ppp_channel *chan; | |
596 | ||
597 | switch (cmd) { | |
598 | case PPPIOCCONNECT: | |
599 | if (get_user(unit, p)) | |
600 | break; | |
601 | err = ppp_connect_channel(pch, unit); | |
602 | break; | |
603 | ||
604 | case PPPIOCDISCONN: | |
605 | err = ppp_disconnect_channel(pch); | |
606 | break; | |
607 | ||
608 | default: | |
609 | down_read(&pch->chan_sem); | |
610 | chan = pch->chan; | |
611 | err = -ENOTTY; | |
612 | if (chan && chan->ops->ioctl) | |
613 | err = chan->ops->ioctl(chan, cmd, arg); | |
614 | up_read(&pch->chan_sem); | |
615 | } | |
616 | return err; | |
617 | } | |
618 | ||
619 | if (pf->kind != INTERFACE) { | |
620 | /* can't happen */ | |
621 | printk(KERN_ERR "PPP: not interface or channel??\n"); | |
622 | return -EINVAL; | |
623 | } | |
624 | ||
625 | ppp = PF_TO_PPP(pf); | |
626 | switch (cmd) { | |
627 | case PPPIOCSMRU: | |
628 | if (get_user(val, p)) | |
629 | break; | |
630 | ppp->mru = val; | |
631 | err = 0; | |
632 | break; | |
633 | ||
634 | case PPPIOCSFLAGS: | |
635 | if (get_user(val, p)) | |
636 | break; | |
637 | ppp_lock(ppp); | |
638 | cflags = ppp->flags & ~val; | |
639 | ppp->flags = val & SC_FLAG_BITS; | |
640 | ppp_unlock(ppp); | |
641 | if (cflags & SC_CCP_OPEN) | |
642 | ppp_ccp_closed(ppp); | |
643 | err = 0; | |
644 | break; | |
645 | ||
646 | case PPPIOCGFLAGS: | |
647 | val = ppp->flags | ppp->xstate | ppp->rstate; | |
648 | if (put_user(val, p)) | |
649 | break; | |
650 | err = 0; | |
651 | break; | |
652 | ||
653 | case PPPIOCSCOMPRESS: | |
654 | err = ppp_set_compress(ppp, arg); | |
655 | break; | |
656 | ||
657 | case PPPIOCGUNIT: | |
658 | if (put_user(ppp->file.index, p)) | |
659 | break; | |
660 | err = 0; | |
661 | break; | |
662 | ||
663 | case PPPIOCSDEBUG: | |
664 | if (get_user(val, p)) | |
665 | break; | |
666 | ppp->debug = val; | |
667 | err = 0; | |
668 | break; | |
669 | ||
670 | case PPPIOCGDEBUG: | |
671 | if (put_user(ppp->debug, p)) | |
672 | break; | |
673 | err = 0; | |
674 | break; | |
675 | ||
676 | case PPPIOCGIDLE: | |
677 | idle.xmit_idle = (jiffies - ppp->last_xmit) / HZ; | |
678 | idle.recv_idle = (jiffies - ppp->last_recv) / HZ; | |
679 | if (copy_to_user(argp, &idle, sizeof(idle))) | |
680 | break; | |
681 | err = 0; | |
682 | break; | |
683 | ||
684 | case PPPIOCSMAXCID: | |
685 | if (get_user(val, p)) | |
686 | break; | |
687 | val2 = 15; | |
688 | if ((val >> 16) != 0) { | |
689 | val2 = val >> 16; | |
690 | val &= 0xffff; | |
691 | } | |
692 | vj = slhc_init(val2+1, val+1); | |
693 | if (vj == 0) { | |
694 | printk(KERN_ERR "PPP: no memory (VJ compressor)\n"); | |
695 | err = -ENOMEM; | |
696 | break; | |
697 | } | |
698 | ppp_lock(ppp); | |
699 | if (ppp->vj != 0) | |
700 | slhc_free(ppp->vj); | |
701 | ppp->vj = vj; | |
702 | ppp_unlock(ppp); | |
703 | err = 0; | |
704 | break; | |
705 | ||
706 | case PPPIOCGNPMODE: | |
707 | case PPPIOCSNPMODE: | |
708 | if (copy_from_user(&npi, argp, sizeof(npi))) | |
709 | break; | |
710 | err = proto_to_npindex(npi.protocol); | |
711 | if (err < 0) | |
712 | break; | |
713 | i = err; | |
714 | if (cmd == PPPIOCGNPMODE) { | |
715 | err = -EFAULT; | |
716 | npi.mode = ppp->npmode[i]; | |
717 | if (copy_to_user(argp, &npi, sizeof(npi))) | |
718 | break; | |
719 | } else { | |
720 | ppp->npmode[i] = npi.mode; | |
721 | /* we may be able to transmit more packets now (??) */ | |
722 | netif_wake_queue(ppp->dev); | |
723 | } | |
724 | err = 0; | |
725 | break; | |
726 | ||
727 | #ifdef CONFIG_PPP_FILTER | |
728 | case PPPIOCSPASS: | |
729 | { | |
730 | struct sock_filter *code; | |
731 | err = get_filter(argp, &code); | |
732 | if (err >= 0) { | |
733 | ppp_lock(ppp); | |
734 | kfree(ppp->pass_filter); | |
735 | ppp->pass_filter = code; | |
736 | ppp->pass_len = err; | |
737 | ppp_unlock(ppp); | |
738 | err = 0; | |
739 | } | |
740 | break; | |
741 | } | |
742 | case PPPIOCSACTIVE: | |
743 | { | |
744 | struct sock_filter *code; | |
745 | err = get_filter(argp, &code); | |
746 | if (err >= 0) { | |
747 | ppp_lock(ppp); | |
748 | kfree(ppp->active_filter); | |
749 | ppp->active_filter = code; | |
750 | ppp->active_len = err; | |
751 | ppp_unlock(ppp); | |
752 | err = 0; | |
753 | } | |
754 | break; | |
755 | } | |
756 | #endif /* CONFIG_PPP_FILTER */ | |
757 | ||
758 | #ifdef CONFIG_PPP_MULTILINK | |
759 | case PPPIOCSMRRU: | |
760 | if (get_user(val, p)) | |
761 | break; | |
762 | ppp_recv_lock(ppp); | |
763 | ppp->mrru = val; | |
764 | ppp_recv_unlock(ppp); | |
765 | err = 0; | |
766 | break; | |
767 | #endif /* CONFIG_PPP_MULTILINK */ | |
768 | ||
769 | default: | |
770 | err = -ENOTTY; | |
771 | } | |
772 | ||
773 | return err; | |
774 | } | |
775 | ||
776 | static int ppp_unattached_ioctl(struct ppp_file *pf, struct file *file, | |
777 | unsigned int cmd, unsigned long arg) | |
778 | { | |
779 | int unit, err = -EFAULT; | |
780 | struct ppp *ppp; | |
781 | struct channel *chan; | |
782 | int __user *p = (int __user *)arg; | |
783 | ||
784 | switch (cmd) { | |
785 | case PPPIOCNEWUNIT: | |
786 | /* Create a new ppp unit */ | |
787 | if (get_user(unit, p)) | |
788 | break; | |
789 | ppp = ppp_create_interface(unit, &err); | |
790 | if (ppp == 0) | |
791 | break; | |
792 | file->private_data = &ppp->file; | |
793 | ppp->owner = file; | |
794 | err = -EFAULT; | |
795 | if (put_user(ppp->file.index, p)) | |
796 | break; | |
797 | err = 0; | |
798 | break; | |
799 | ||
800 | case PPPIOCATTACH: | |
801 | /* Attach to an existing ppp unit */ | |
802 | if (get_user(unit, p)) | |
803 | break; | |
8ed965d6 | 804 | mutex_lock(&all_ppp_mutex); |
1da177e4 LT |
805 | err = -ENXIO; |
806 | ppp = ppp_find_unit(unit); | |
807 | if (ppp != 0) { | |
808 | atomic_inc(&ppp->file.refcnt); | |
809 | file->private_data = &ppp->file; | |
810 | err = 0; | |
811 | } | |
8ed965d6 | 812 | mutex_unlock(&all_ppp_mutex); |
1da177e4 LT |
813 | break; |
814 | ||
815 | case PPPIOCATTCHAN: | |
816 | if (get_user(unit, p)) | |
817 | break; | |
818 | spin_lock_bh(&all_channels_lock); | |
819 | err = -ENXIO; | |
820 | chan = ppp_find_channel(unit); | |
821 | if (chan != 0) { | |
822 | atomic_inc(&chan->file.refcnt); | |
823 | file->private_data = &chan->file; | |
824 | err = 0; | |
825 | } | |
826 | spin_unlock_bh(&all_channels_lock); | |
827 | break; | |
828 | ||
829 | default: | |
830 | err = -ENOTTY; | |
831 | } | |
832 | return err; | |
833 | } | |
834 | ||
d54b1fdb | 835 | static const struct file_operations ppp_device_fops = { |
1da177e4 LT |
836 | .owner = THIS_MODULE, |
837 | .read = ppp_read, | |
838 | .write = ppp_write, | |
839 | .poll = ppp_poll, | |
840 | .ioctl = ppp_ioctl, | |
841 | .open = ppp_open, | |
842 | .release = ppp_release | |
843 | }; | |
844 | ||
845 | #define PPP_MAJOR 108 | |
846 | ||
847 | /* Called at boot time if ppp is compiled into the kernel, | |
848 | or at module load time (from init_module) if compiled as a module. */ | |
849 | static int __init ppp_init(void) | |
850 | { | |
851 | int err; | |
852 | ||
853 | printk(KERN_INFO "PPP generic driver version " PPP_VERSION "\n"); | |
854 | err = register_chrdev(PPP_MAJOR, "ppp", &ppp_device_fops); | |
855 | if (!err) { | |
56b22935 | 856 | ppp_class = class_create(THIS_MODULE, "ppp"); |
1da177e4 LT |
857 | if (IS_ERR(ppp_class)) { |
858 | err = PTR_ERR(ppp_class); | |
859 | goto out_chrdev; | |
860 | } | |
9a6a2a5e | 861 | device_create(ppp_class, NULL, MKDEV(PPP_MAJOR, 0), "ppp"); |
1da177e4 LT |
862 | } |
863 | ||
864 | out: | |
865 | if (err) | |
866 | printk(KERN_ERR "failed to register PPP device (%d)\n", err); | |
867 | return err; | |
868 | ||
1da177e4 LT |
869 | out_chrdev: |
870 | unregister_chrdev(PPP_MAJOR, "ppp"); | |
871 | goto out; | |
872 | } | |
873 | ||
874 | /* | |
875 | * Network interface unit routines. | |
876 | */ | |
877 | static int | |
878 | ppp_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
879 | { | |
880 | struct ppp *ppp = (struct ppp *) dev->priv; | |
881 | int npi, proto; | |
882 | unsigned char *pp; | |
883 | ||
884 | npi = ethertype_to_npindex(ntohs(skb->protocol)); | |
885 | if (npi < 0) | |
886 | goto outf; | |
887 | ||
888 | /* Drop, accept or reject the packet */ | |
889 | switch (ppp->npmode[npi]) { | |
890 | case NPMODE_PASS: | |
891 | break; | |
892 | case NPMODE_QUEUE: | |
893 | /* it would be nice to have a way to tell the network | |
894 | system to queue this one up for later. */ | |
895 | goto outf; | |
896 | case NPMODE_DROP: | |
897 | case NPMODE_ERROR: | |
898 | goto outf; | |
899 | } | |
900 | ||
901 | /* Put the 2-byte PPP protocol number on the front, | |
902 | making sure there is room for the address and control fields. */ | |
903 | if (skb_headroom(skb) < PPP_HDRLEN) { | |
904 | struct sk_buff *ns; | |
905 | ||
906 | ns = alloc_skb(skb->len + dev->hard_header_len, GFP_ATOMIC); | |
907 | if (ns == 0) | |
908 | goto outf; | |
909 | skb_reserve(ns, dev->hard_header_len); | |
910 | skb_copy_bits(skb, 0, skb_put(ns, skb->len), skb->len); | |
911 | kfree_skb(skb); | |
912 | skb = ns; | |
913 | } | |
914 | pp = skb_push(skb, 2); | |
915 | proto = npindex_to_proto[npi]; | |
916 | pp[0] = proto >> 8; | |
917 | pp[1] = proto; | |
918 | ||
919 | netif_stop_queue(dev); | |
920 | skb_queue_tail(&ppp->file.xq, skb); | |
921 | ppp_xmit_process(ppp); | |
922 | return 0; | |
923 | ||
924 | outf: | |
925 | kfree_skb(skb); | |
926 | ++ppp->stats.tx_dropped; | |
927 | return 0; | |
928 | } | |
929 | ||
930 | static struct net_device_stats * | |
931 | ppp_net_stats(struct net_device *dev) | |
932 | { | |
933 | struct ppp *ppp = (struct ppp *) dev->priv; | |
934 | ||
935 | return &ppp->stats; | |
936 | } | |
937 | ||
938 | static int | |
939 | ppp_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
940 | { | |
941 | struct ppp *ppp = dev->priv; | |
942 | int err = -EFAULT; | |
943 | void __user *addr = (void __user *) ifr->ifr_ifru.ifru_data; | |
944 | struct ppp_stats stats; | |
945 | struct ppp_comp_stats cstats; | |
946 | char *vers; | |
947 | ||
948 | switch (cmd) { | |
949 | case SIOCGPPPSTATS: | |
950 | ppp_get_stats(ppp, &stats); | |
951 | if (copy_to_user(addr, &stats, sizeof(stats))) | |
952 | break; | |
953 | err = 0; | |
954 | break; | |
955 | ||
956 | case SIOCGPPPCSTATS: | |
957 | memset(&cstats, 0, sizeof(cstats)); | |
958 | if (ppp->xc_state != 0) | |
959 | ppp->xcomp->comp_stat(ppp->xc_state, &cstats.c); | |
960 | if (ppp->rc_state != 0) | |
961 | ppp->rcomp->decomp_stat(ppp->rc_state, &cstats.d); | |
962 | if (copy_to_user(addr, &cstats, sizeof(cstats))) | |
963 | break; | |
964 | err = 0; | |
965 | break; | |
966 | ||
967 | case SIOCGPPPVER: | |
968 | vers = PPP_VERSION; | |
969 | if (copy_to_user(addr, vers, strlen(vers) + 1)) | |
970 | break; | |
971 | err = 0; | |
972 | break; | |
973 | ||
974 | default: | |
975 | err = -EINVAL; | |
976 | } | |
977 | ||
978 | return err; | |
979 | } | |
980 | ||
981 | static void ppp_setup(struct net_device *dev) | |
982 | { | |
983 | dev->hard_header_len = PPP_HDRLEN; | |
984 | dev->mtu = PPP_MTU; | |
985 | dev->addr_len = 0; | |
986 | dev->tx_queue_len = 3; | |
987 | dev->type = ARPHRD_PPP; | |
988 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
989 | } | |
990 | ||
991 | /* | |
992 | * Transmit-side routines. | |
993 | */ | |
994 | ||
995 | /* | |
996 | * Called to do any work queued up on the transmit side | |
997 | * that can now be done. | |
998 | */ | |
999 | static void | |
1000 | ppp_xmit_process(struct ppp *ppp) | |
1001 | { | |
1002 | struct sk_buff *skb; | |
1003 | ||
1004 | ppp_xmit_lock(ppp); | |
1005 | if (ppp->dev != 0) { | |
1006 | ppp_push(ppp); | |
1007 | while (ppp->xmit_pending == 0 | |
1008 | && (skb = skb_dequeue(&ppp->file.xq)) != 0) | |
1009 | ppp_send_frame(ppp, skb); | |
1010 | /* If there's no work left to do, tell the core net | |
1011 | code that we can accept some more. */ | |
1012 | if (ppp->xmit_pending == 0 && skb_peek(&ppp->file.xq) == 0) | |
1013 | netif_wake_queue(ppp->dev); | |
1014 | } | |
1015 | ppp_xmit_unlock(ppp); | |
1016 | } | |
1017 | ||
b3f9b92a MD |
1018 | static inline struct sk_buff * |
1019 | pad_compress_skb(struct ppp *ppp, struct sk_buff *skb) | |
1020 | { | |
1021 | struct sk_buff *new_skb; | |
1022 | int len; | |
1023 | int new_skb_size = ppp->dev->mtu + | |
1024 | ppp->xcomp->comp_extra + ppp->dev->hard_header_len; | |
1025 | int compressor_skb_size = ppp->dev->mtu + | |
1026 | ppp->xcomp->comp_extra + PPP_HDRLEN; | |
1027 | new_skb = alloc_skb(new_skb_size, GFP_ATOMIC); | |
1028 | if (!new_skb) { | |
1029 | if (net_ratelimit()) | |
1030 | printk(KERN_ERR "PPP: no memory (comp pkt)\n"); | |
1031 | return NULL; | |
1032 | } | |
1033 | if (ppp->dev->hard_header_len > PPP_HDRLEN) | |
1034 | skb_reserve(new_skb, | |
1035 | ppp->dev->hard_header_len - PPP_HDRLEN); | |
1036 | ||
1037 | /* compressor still expects A/C bytes in hdr */ | |
1038 | len = ppp->xcomp->compress(ppp->xc_state, skb->data - 2, | |
1039 | new_skb->data, skb->len + 2, | |
1040 | compressor_skb_size); | |
1041 | if (len > 0 && (ppp->flags & SC_CCP_UP)) { | |
1042 | kfree_skb(skb); | |
1043 | skb = new_skb; | |
1044 | skb_put(skb, len); | |
1045 | skb_pull(skb, 2); /* pull off A/C bytes */ | |
1046 | } else if (len == 0) { | |
1047 | /* didn't compress, or CCP not up yet */ | |
1048 | kfree_skb(new_skb); | |
1049 | new_skb = skb; | |
1050 | } else { | |
1051 | /* | |
1052 | * (len < 0) | |
1053 | * MPPE requires that we do not send unencrypted | |
1054 | * frames. The compressor will return -1 if we | |
1055 | * should drop the frame. We cannot simply test | |
1056 | * the compress_proto because MPPE and MPPC share | |
1057 | * the same number. | |
1058 | */ | |
1059 | if (net_ratelimit()) | |
1060 | printk(KERN_ERR "ppp: compressor dropped pkt\n"); | |
1061 | kfree_skb(skb); | |
1062 | kfree_skb(new_skb); | |
1063 | new_skb = NULL; | |
1064 | } | |
1065 | return new_skb; | |
1066 | } | |
1067 | ||
1da177e4 LT |
1068 | /* |
1069 | * Compress and send a frame. | |
1070 | * The caller should have locked the xmit path, | |
1071 | * and xmit_pending should be 0. | |
1072 | */ | |
1073 | static void | |
1074 | ppp_send_frame(struct ppp *ppp, struct sk_buff *skb) | |
1075 | { | |
1076 | int proto = PPP_PROTO(skb); | |
1077 | struct sk_buff *new_skb; | |
1078 | int len; | |
1079 | unsigned char *cp; | |
1080 | ||
1081 | if (proto < 0x8000) { | |
1082 | #ifdef CONFIG_PPP_FILTER | |
1083 | /* check if we should pass this packet */ | |
1084 | /* the filter instructions are constructed assuming | |
1085 | a four-byte PPP header on each packet */ | |
1086 | *skb_push(skb, 2) = 1; | |
1087 | if (ppp->pass_filter | |
1088 | && sk_run_filter(skb, ppp->pass_filter, | |
1089 | ppp->pass_len) == 0) { | |
1090 | if (ppp->debug & 1) | |
1091 | printk(KERN_DEBUG "PPP: outbound frame not passed\n"); | |
1092 | kfree_skb(skb); | |
1093 | return; | |
1094 | } | |
1095 | /* if this packet passes the active filter, record the time */ | |
1096 | if (!(ppp->active_filter | |
1097 | && sk_run_filter(skb, ppp->active_filter, | |
1098 | ppp->active_len) == 0)) | |
1099 | ppp->last_xmit = jiffies; | |
1100 | skb_pull(skb, 2); | |
1101 | #else | |
1102 | /* for data packets, record the time */ | |
1103 | ppp->last_xmit = jiffies; | |
1104 | #endif /* CONFIG_PPP_FILTER */ | |
1105 | } | |
1106 | ||
1107 | ++ppp->stats.tx_packets; | |
1108 | ppp->stats.tx_bytes += skb->len - 2; | |
1109 | ||
1110 | switch (proto) { | |
1111 | case PPP_IP: | |
1112 | if (ppp->vj == 0 || (ppp->flags & SC_COMP_TCP) == 0) | |
1113 | break; | |
1114 | /* try to do VJ TCP header compression */ | |
1115 | new_skb = alloc_skb(skb->len + ppp->dev->hard_header_len - 2, | |
1116 | GFP_ATOMIC); | |
1117 | if (new_skb == 0) { | |
1118 | printk(KERN_ERR "PPP: no memory (VJ comp pkt)\n"); | |
1119 | goto drop; | |
1120 | } | |
1121 | skb_reserve(new_skb, ppp->dev->hard_header_len - 2); | |
1122 | cp = skb->data + 2; | |
1123 | len = slhc_compress(ppp->vj, cp, skb->len - 2, | |
1124 | new_skb->data + 2, &cp, | |
1125 | !(ppp->flags & SC_NO_TCP_CCID)); | |
1126 | if (cp == skb->data + 2) { | |
1127 | /* didn't compress */ | |
1128 | kfree_skb(new_skb); | |
1129 | } else { | |
1130 | if (cp[0] & SL_TYPE_COMPRESSED_TCP) { | |
1131 | proto = PPP_VJC_COMP; | |
1132 | cp[0] &= ~SL_TYPE_COMPRESSED_TCP; | |
1133 | } else { | |
1134 | proto = PPP_VJC_UNCOMP; | |
1135 | cp[0] = skb->data[2]; | |
1136 | } | |
1137 | kfree_skb(skb); | |
1138 | skb = new_skb; | |
1139 | cp = skb_put(skb, len + 2); | |
1140 | cp[0] = 0; | |
1141 | cp[1] = proto; | |
1142 | } | |
1143 | break; | |
1144 | ||
1145 | case PPP_CCP: | |
1146 | /* peek at outbound CCP frames */ | |
1147 | ppp_ccp_peek(ppp, skb, 0); | |
1148 | break; | |
1149 | } | |
1150 | ||
1151 | /* try to do packet compression */ | |
1152 | if ((ppp->xstate & SC_COMP_RUN) && ppp->xc_state != 0 | |
1153 | && proto != PPP_LCP && proto != PPP_CCP) { | |
b3f9b92a MD |
1154 | if (!(ppp->flags & SC_CCP_UP) && (ppp->flags & SC_MUST_COMP)) { |
1155 | if (net_ratelimit()) | |
1156 | printk(KERN_ERR "ppp: compression required but down - pkt dropped.\n"); | |
1da177e4 LT |
1157 | goto drop; |
1158 | } | |
b3f9b92a MD |
1159 | skb = pad_compress_skb(ppp, skb); |
1160 | if (!skb) | |
1161 | goto drop; | |
1da177e4 LT |
1162 | } |
1163 | ||
1164 | /* | |
1165 | * If we are waiting for traffic (demand dialling), | |
1166 | * queue it up for pppd to receive. | |
1167 | */ | |
1168 | if (ppp->flags & SC_LOOP_TRAFFIC) { | |
1169 | if (ppp->file.rq.qlen > PPP_MAX_RQLEN) | |
1170 | goto drop; | |
1171 | skb_queue_tail(&ppp->file.rq, skb); | |
1172 | wake_up_interruptible(&ppp->file.rwait); | |
1173 | return; | |
1174 | } | |
1175 | ||
1176 | ppp->xmit_pending = skb; | |
1177 | ppp_push(ppp); | |
1178 | return; | |
1179 | ||
1180 | drop: | |
b3f9b92a MD |
1181 | if (skb) |
1182 | kfree_skb(skb); | |
1da177e4 LT |
1183 | ++ppp->stats.tx_errors; |
1184 | } | |
1185 | ||
1186 | /* | |
1187 | * Try to send the frame in xmit_pending. | |
1188 | * The caller should have the xmit path locked. | |
1189 | */ | |
1190 | static void | |
1191 | ppp_push(struct ppp *ppp) | |
1192 | { | |
1193 | struct list_head *list; | |
1194 | struct channel *pch; | |
1195 | struct sk_buff *skb = ppp->xmit_pending; | |
1196 | ||
1197 | if (skb == 0) | |
1198 | return; | |
1199 | ||
1200 | list = &ppp->channels; | |
1201 | if (list_empty(list)) { | |
1202 | /* nowhere to send the packet, just drop it */ | |
1203 | ppp->xmit_pending = NULL; | |
1204 | kfree_skb(skb); | |
1205 | return; | |
1206 | } | |
1207 | ||
1208 | if ((ppp->flags & SC_MULTILINK) == 0) { | |
1209 | /* not doing multilink: send it down the first channel */ | |
1210 | list = list->next; | |
1211 | pch = list_entry(list, struct channel, clist); | |
1212 | ||
1213 | spin_lock_bh(&pch->downl); | |
1214 | if (pch->chan) { | |
1215 | if (pch->chan->ops->start_xmit(pch->chan, skb)) | |
1216 | ppp->xmit_pending = NULL; | |
1217 | } else { | |
1218 | /* channel got unregistered */ | |
1219 | kfree_skb(skb); | |
1220 | ppp->xmit_pending = NULL; | |
1221 | } | |
1222 | spin_unlock_bh(&pch->downl); | |
1223 | return; | |
1224 | } | |
1225 | ||
1226 | #ifdef CONFIG_PPP_MULTILINK | |
1227 | /* Multilink: fragment the packet over as many links | |
1228 | as can take the packet at the moment. */ | |
1229 | if (!ppp_mp_explode(ppp, skb)) | |
1230 | return; | |
1231 | #endif /* CONFIG_PPP_MULTILINK */ | |
1232 | ||
1233 | ppp->xmit_pending = NULL; | |
1234 | kfree_skb(skb); | |
1235 | } | |
1236 | ||
1237 | #ifdef CONFIG_PPP_MULTILINK | |
1238 | /* | |
1239 | * Divide a packet to be transmitted into fragments and | |
1240 | * send them out the individual links. | |
1241 | */ | |
1242 | static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb) | |
1243 | { | |
516cd15f | 1244 | int len, fragsize; |
1da177e4 | 1245 | int i, bits, hdrlen, mtu; |
516cd15f PM |
1246 | int flen; |
1247 | int navail, nfree; | |
1248 | int nbigger; | |
1da177e4 LT |
1249 | unsigned char *p, *q; |
1250 | struct list_head *list; | |
1251 | struct channel *pch; | |
1252 | struct sk_buff *frag; | |
1253 | struct ppp_channel *chan; | |
1254 | ||
516cd15f PM |
1255 | nfree = 0; /* # channels which have no packet already queued */ |
1256 | navail = 0; /* total # of usable channels (not deregistered) */ | |
1da177e4 | 1257 | hdrlen = (ppp->flags & SC_MP_XSHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN; |
516cd15f | 1258 | i = 0; |
81616c5a | 1259 | list_for_each_entry(pch, &ppp->channels, clist) { |
516cd15f PM |
1260 | navail += pch->avail = (pch->chan != NULL); |
1261 | if (pch->avail) { | |
b03efcfb DM |
1262 | if (skb_queue_empty(&pch->file.xq) || |
1263 | !pch->had_frag) { | |
516cd15f PM |
1264 | pch->avail = 2; |
1265 | ++nfree; | |
1da177e4 | 1266 | } |
516cd15f PM |
1267 | if (!pch->had_frag && i < ppp->nxchan) |
1268 | ppp->nxchan = i; | |
1da177e4 | 1269 | } |
516cd15f | 1270 | ++i; |
1da177e4 | 1271 | } |
516cd15f PM |
1272 | |
1273 | /* | |
1274 | * Don't start sending this packet unless at least half of | |
1275 | * the channels are free. This gives much better TCP | |
1276 | * performance if we have a lot of channels. | |
1277 | */ | |
1278 | if (nfree == 0 || nfree < navail / 2) | |
1da177e4 LT |
1279 | return 0; /* can't take now, leave it in xmit_pending */ |
1280 | ||
1281 | /* Do protocol field compression (XXX this should be optional) */ | |
1282 | p = skb->data; | |
1283 | len = skb->len; | |
1284 | if (*p == 0) { | |
1285 | ++p; | |
1286 | --len; | |
1287 | } | |
1288 | ||
516cd15f PM |
1289 | /* |
1290 | * Decide on fragment size. | |
1291 | * We create a fragment for each free channel regardless of | |
1292 | * how small they are (i.e. even 0 length) in order to minimize | |
1293 | * the time that it will take to detect when a channel drops | |
1294 | * a fragment. | |
1295 | */ | |
1da177e4 | 1296 | fragsize = len; |
516cd15f | 1297 | if (nfree > 1) |
57cd5f75 | 1298 | fragsize = DIV_ROUND_UP(fragsize, nfree); |
516cd15f PM |
1299 | /* nbigger channels get fragsize bytes, the rest get fragsize-1, |
1300 | except if nbigger==0, then they all get fragsize. */ | |
1301 | nbigger = len % nfree; | |
1da177e4 LT |
1302 | |
1303 | /* skip to the channel after the one we last used | |
1304 | and start at that one */ | |
81616c5a | 1305 | list = &ppp->channels; |
1da177e4 LT |
1306 | for (i = 0; i < ppp->nxchan; ++i) { |
1307 | list = list->next; | |
1308 | if (list == &ppp->channels) { | |
1309 | i = 0; | |
1310 | break; | |
1311 | } | |
1312 | } | |
1313 | ||
1314 | /* create a fragment for each channel */ | |
1315 | bits = B; | |
516cd15f | 1316 | while (nfree > 0 || len > 0) { |
1da177e4 LT |
1317 | list = list->next; |
1318 | if (list == &ppp->channels) { | |
1319 | i = 0; | |
1320 | continue; | |
1321 | } | |
1322 | pch = list_entry(list, struct channel, clist); | |
1323 | ++i; | |
1324 | if (!pch->avail) | |
1325 | continue; | |
1326 | ||
516cd15f PM |
1327 | /* |
1328 | * Skip this channel if it has a fragment pending already and | |
1329 | * we haven't given a fragment to all of the free channels. | |
1330 | */ | |
1331 | if (pch->avail == 1) { | |
1332 | if (nfree > 0) | |
1333 | continue; | |
1334 | } else { | |
1335 | --nfree; | |
1336 | pch->avail = 1; | |
1337 | } | |
1338 | ||
1da177e4 LT |
1339 | /* check the channel's mtu and whether it is still attached. */ |
1340 | spin_lock_bh(&pch->downl); | |
516cd15f PM |
1341 | if (pch->chan == NULL) { |
1342 | /* can't use this channel, it's being deregistered */ | |
1da177e4 LT |
1343 | spin_unlock_bh(&pch->downl); |
1344 | pch->avail = 0; | |
516cd15f | 1345 | if (--navail == 0) |
1da177e4 LT |
1346 | break; |
1347 | continue; | |
1348 | } | |
1349 | ||
1350 | /* | |
516cd15f PM |
1351 | * Create a fragment for this channel of |
1352 | * min(max(mtu+2-hdrlen, 4), fragsize, len) bytes. | |
1353 | * If mtu+2-hdrlen < 4, that is a ridiculously small | |
1354 | * MTU, so we use mtu = 2 + hdrlen. | |
1da177e4 LT |
1355 | */ |
1356 | if (fragsize > len) | |
1357 | fragsize = len; | |
516cd15f PM |
1358 | flen = fragsize; |
1359 | mtu = pch->chan->mtu + 2 - hdrlen; | |
1360 | if (mtu < 4) | |
1361 | mtu = 4; | |
1362 | if (flen > mtu) | |
1363 | flen = mtu; | |
1364 | if (flen == len && nfree == 0) | |
1365 | bits |= E; | |
1366 | frag = alloc_skb(flen + hdrlen + (flen == 0), GFP_ATOMIC); | |
1367 | if (frag == 0) | |
1368 | goto noskb; | |
1369 | q = skb_put(frag, flen + hdrlen); | |
1370 | ||
1371 | /* make the MP header */ | |
1372 | q[0] = PPP_MP >> 8; | |
1373 | q[1] = PPP_MP; | |
1374 | if (ppp->flags & SC_MP_XSHORTSEQ) { | |
1375 | q[2] = bits + ((ppp->nxseq >> 8) & 0xf); | |
1376 | q[3] = ppp->nxseq; | |
1377 | } else { | |
1378 | q[2] = bits; | |
1379 | q[3] = ppp->nxseq >> 16; | |
1380 | q[4] = ppp->nxseq >> 8; | |
1381 | q[5] = ppp->nxseq; | |
1da177e4 | 1382 | } |
516cd15f PM |
1383 | |
1384 | /* | |
1385 | * Copy the data in. | |
1386 | * Unfortunately there is a bug in older versions of | |
1387 | * the Linux PPP multilink reconstruction code where it | |
1388 | * drops 0-length fragments. Therefore we make sure the | |
1389 | * fragment has at least one byte of data. Any bytes | |
1390 | * we add in this situation will end up as padding on the | |
1391 | * end of the reconstructed packet. | |
1392 | */ | |
1393 | if (flen == 0) | |
1394 | *skb_put(frag, 1) = 0; | |
1395 | else | |
1396 | memcpy(q + hdrlen, p, flen); | |
1397 | ||
1398 | /* try to send it down the channel */ | |
1399 | chan = pch->chan; | |
b03efcfb DM |
1400 | if (!skb_queue_empty(&pch->file.xq) || |
1401 | !chan->ops->start_xmit(chan, frag)) | |
516cd15f PM |
1402 | skb_queue_tail(&pch->file.xq, frag); |
1403 | pch->had_frag = 1; | |
1404 | p += flen; | |
1405 | len -= flen; | |
1406 | ++ppp->nxseq; | |
1407 | bits = 0; | |
1da177e4 | 1408 | spin_unlock_bh(&pch->downl); |
516cd15f PM |
1409 | |
1410 | if (--nbigger == 0 && fragsize > 0) | |
1411 | --fragsize; | |
1412 | } | |
1da177e4 LT |
1413 | ppp->nxchan = i; |
1414 | ||
1415 | return 1; | |
1416 | ||
1417 | noskb: | |
1418 | spin_unlock_bh(&pch->downl); | |
1419 | if (ppp->debug & 1) | |
1420 | printk(KERN_ERR "PPP: no memory (fragment)\n"); | |
1421 | ++ppp->stats.tx_errors; | |
1422 | ++ppp->nxseq; | |
1423 | return 1; /* abandon the frame */ | |
1424 | } | |
1425 | #endif /* CONFIG_PPP_MULTILINK */ | |
1426 | ||
1427 | /* | |
1428 | * Try to send data out on a channel. | |
1429 | */ | |
1430 | static void | |
1431 | ppp_channel_push(struct channel *pch) | |
1432 | { | |
1433 | struct sk_buff *skb; | |
1434 | struct ppp *ppp; | |
1435 | ||
1436 | spin_lock_bh(&pch->downl); | |
1437 | if (pch->chan != 0) { | |
b03efcfb | 1438 | while (!skb_queue_empty(&pch->file.xq)) { |
1da177e4 LT |
1439 | skb = skb_dequeue(&pch->file.xq); |
1440 | if (!pch->chan->ops->start_xmit(pch->chan, skb)) { | |
1441 | /* put the packet back and try again later */ | |
1442 | skb_queue_head(&pch->file.xq, skb); | |
1443 | break; | |
1444 | } | |
1445 | } | |
1446 | } else { | |
1447 | /* channel got deregistered */ | |
1448 | skb_queue_purge(&pch->file.xq); | |
1449 | } | |
1450 | spin_unlock_bh(&pch->downl); | |
1451 | /* see if there is anything from the attached unit to be sent */ | |
b03efcfb | 1452 | if (skb_queue_empty(&pch->file.xq)) { |
1da177e4 LT |
1453 | read_lock_bh(&pch->upl); |
1454 | ppp = pch->ppp; | |
1455 | if (ppp != 0) | |
1456 | ppp_xmit_process(ppp); | |
1457 | read_unlock_bh(&pch->upl); | |
1458 | } | |
1459 | } | |
1460 | ||
1461 | /* | |
1462 | * Receive-side routines. | |
1463 | */ | |
1464 | ||
1465 | /* misuse a few fields of the skb for MP reconstruction */ | |
1466 | #define sequence priority | |
1467 | #define BEbits cb[0] | |
1468 | ||
1469 | static inline void | |
1470 | ppp_do_recv(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) | |
1471 | { | |
1472 | ppp_recv_lock(ppp); | |
1473 | /* ppp->dev == 0 means interface is closing down */ | |
1474 | if (ppp->dev != 0) | |
1475 | ppp_receive_frame(ppp, skb, pch); | |
1476 | else | |
1477 | kfree_skb(skb); | |
1478 | ppp_recv_unlock(ppp); | |
1479 | } | |
1480 | ||
1481 | void | |
1482 | ppp_input(struct ppp_channel *chan, struct sk_buff *skb) | |
1483 | { | |
1484 | struct channel *pch = chan->ppp; | |
1485 | int proto; | |
1486 | ||
1487 | if (pch == 0 || skb->len == 0) { | |
1488 | kfree_skb(skb); | |
1489 | return; | |
1490 | } | |
516cd15f | 1491 | |
1da177e4 LT |
1492 | proto = PPP_PROTO(skb); |
1493 | read_lock_bh(&pch->upl); | |
1494 | if (pch->ppp == 0 || proto >= 0xc000 || proto == PPP_CCPFRAG) { | |
1495 | /* put it on the channel queue */ | |
1496 | skb_queue_tail(&pch->file.rq, skb); | |
1497 | /* drop old frames if queue too long */ | |
1498 | while (pch->file.rq.qlen > PPP_MAX_RQLEN | |
1499 | && (skb = skb_dequeue(&pch->file.rq)) != 0) | |
1500 | kfree_skb(skb); | |
1501 | wake_up_interruptible(&pch->file.rwait); | |
1502 | } else { | |
1503 | ppp_do_recv(pch->ppp, skb, pch); | |
1504 | } | |
1505 | read_unlock_bh(&pch->upl); | |
1506 | } | |
1507 | ||
1508 | /* Put a 0-length skb in the receive queue as an error indication */ | |
1509 | void | |
1510 | ppp_input_error(struct ppp_channel *chan, int code) | |
1511 | { | |
1512 | struct channel *pch = chan->ppp; | |
1513 | struct sk_buff *skb; | |
1514 | ||
1515 | if (pch == 0) | |
1516 | return; | |
1517 | ||
1518 | read_lock_bh(&pch->upl); | |
1519 | if (pch->ppp != 0) { | |
1520 | skb = alloc_skb(0, GFP_ATOMIC); | |
1521 | if (skb != 0) { | |
1522 | skb->len = 0; /* probably unnecessary */ | |
1523 | skb->cb[0] = code; | |
1524 | ppp_do_recv(pch->ppp, skb, pch); | |
1525 | } | |
1526 | } | |
1527 | read_unlock_bh(&pch->upl); | |
1528 | } | |
1529 | ||
1530 | /* | |
1531 | * We come in here to process a received frame. | |
1532 | * The receive side of the ppp unit is locked. | |
1533 | */ | |
1534 | static void | |
1535 | ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) | |
1536 | { | |
1537 | if (skb->len >= 2) { | |
1538 | #ifdef CONFIG_PPP_MULTILINK | |
1539 | /* XXX do channel-level decompression here */ | |
1540 | if (PPP_PROTO(skb) == PPP_MP) | |
1541 | ppp_receive_mp_frame(ppp, skb, pch); | |
1542 | else | |
1543 | #endif /* CONFIG_PPP_MULTILINK */ | |
1544 | ppp_receive_nonmp_frame(ppp, skb); | |
1545 | return; | |
1546 | } | |
1547 | ||
1548 | if (skb->len > 0) | |
1549 | /* note: a 0-length skb is used as an error indication */ | |
1550 | ++ppp->stats.rx_length_errors; | |
1551 | ||
1552 | kfree_skb(skb); | |
1553 | ppp_receive_error(ppp); | |
1554 | } | |
1555 | ||
1556 | static void | |
1557 | ppp_receive_error(struct ppp *ppp) | |
1558 | { | |
1559 | ++ppp->stats.rx_errors; | |
1560 | if (ppp->vj != 0) | |
1561 | slhc_toss(ppp->vj); | |
1562 | } | |
1563 | ||
1564 | static void | |
1565 | ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb) | |
1566 | { | |
1567 | struct sk_buff *ns; | |
1568 | int proto, len, npi; | |
1569 | ||
1570 | /* | |
1571 | * Decompress the frame, if compressed. | |
1572 | * Note that some decompressors need to see uncompressed frames | |
1573 | * that come in as well as compressed frames. | |
1574 | */ | |
1575 | if (ppp->rc_state != 0 && (ppp->rstate & SC_DECOMP_RUN) | |
1576 | && (ppp->rstate & (SC_DC_FERROR | SC_DC_ERROR)) == 0) | |
1577 | skb = ppp_decompress_frame(ppp, skb); | |
1578 | ||
b3f9b92a MD |
1579 | if (ppp->flags & SC_MUST_COMP && ppp->rstate & SC_DC_FERROR) |
1580 | goto err; | |
1581 | ||
1da177e4 LT |
1582 | proto = PPP_PROTO(skb); |
1583 | switch (proto) { | |
1584 | case PPP_VJC_COMP: | |
1585 | /* decompress VJ compressed packets */ | |
1586 | if (ppp->vj == 0 || (ppp->flags & SC_REJ_COMP_TCP)) | |
1587 | goto err; | |
1588 | ||
1589 | if (skb_tailroom(skb) < 124) { | |
1590 | /* copy to a new sk_buff with more tailroom */ | |
1591 | ns = dev_alloc_skb(skb->len + 128); | |
1592 | if (ns == 0) { | |
1593 | printk(KERN_ERR"PPP: no memory (VJ decomp)\n"); | |
1594 | goto err; | |
1595 | } | |
1596 | skb_reserve(ns, 2); | |
1597 | skb_copy_bits(skb, 0, skb_put(ns, skb->len), skb->len); | |
1598 | kfree_skb(skb); | |
1599 | skb = ns; | |
1600 | } | |
e3f749c4 HX |
1601 | else |
1602 | skb->ip_summed = CHECKSUM_NONE; | |
1da177e4 LT |
1603 | |
1604 | len = slhc_uncompress(ppp->vj, skb->data + 2, skb->len - 2); | |
1605 | if (len <= 0) { | |
1606 | printk(KERN_DEBUG "PPP: VJ decompression error\n"); | |
1607 | goto err; | |
1608 | } | |
1609 | len += 2; | |
1610 | if (len > skb->len) | |
1611 | skb_put(skb, len - skb->len); | |
1612 | else if (len < skb->len) | |
1613 | skb_trim(skb, len); | |
1614 | proto = PPP_IP; | |
1615 | break; | |
1616 | ||
1617 | case PPP_VJC_UNCOMP: | |
1618 | if (ppp->vj == 0 || (ppp->flags & SC_REJ_COMP_TCP)) | |
1619 | goto err; | |
6aa20a22 | 1620 | |
1da177e4 LT |
1621 | /* Until we fix the decompressor need to make sure |
1622 | * data portion is linear. | |
1623 | */ | |
6aa20a22 | 1624 | if (!pskb_may_pull(skb, skb->len)) |
1da177e4 LT |
1625 | goto err; |
1626 | ||
1627 | if (slhc_remember(ppp->vj, skb->data + 2, skb->len - 2) <= 0) { | |
1628 | printk(KERN_ERR "PPP: VJ uncompressed error\n"); | |
1629 | goto err; | |
1630 | } | |
1631 | proto = PPP_IP; | |
1632 | break; | |
1633 | ||
1634 | case PPP_CCP: | |
1635 | ppp_ccp_peek(ppp, skb, 1); | |
1636 | break; | |
1637 | } | |
1638 | ||
1639 | ++ppp->stats.rx_packets; | |
1640 | ppp->stats.rx_bytes += skb->len - 2; | |
1641 | ||
1642 | npi = proto_to_npindex(proto); | |
1643 | if (npi < 0) { | |
1644 | /* control or unknown frame - pass it to pppd */ | |
1645 | skb_queue_tail(&ppp->file.rq, skb); | |
1646 | /* limit queue length by dropping old frames */ | |
1647 | while (ppp->file.rq.qlen > PPP_MAX_RQLEN | |
1648 | && (skb = skb_dequeue(&ppp->file.rq)) != 0) | |
1649 | kfree_skb(skb); | |
1650 | /* wake up any process polling or blocking on read */ | |
1651 | wake_up_interruptible(&ppp->file.rwait); | |
1652 | ||
1653 | } else { | |
1654 | /* network protocol frame - give it to the kernel */ | |
1655 | ||
1656 | #ifdef CONFIG_PPP_FILTER | |
1657 | /* check if the packet passes the pass and active filters */ | |
1658 | /* the filter instructions are constructed assuming | |
1659 | a four-byte PPP header on each packet */ | |
1660 | *skb_push(skb, 2) = 0; | |
1661 | if (ppp->pass_filter | |
1662 | && sk_run_filter(skb, ppp->pass_filter, | |
1663 | ppp->pass_len) == 0) { | |
1664 | if (ppp->debug & 1) | |
1665 | printk(KERN_DEBUG "PPP: inbound frame not passed\n"); | |
1666 | kfree_skb(skb); | |
1667 | return; | |
1668 | } | |
1669 | if (!(ppp->active_filter | |
1670 | && sk_run_filter(skb, ppp->active_filter, | |
1671 | ppp->active_len) == 0)) | |
1672 | ppp->last_recv = jiffies; | |
1673 | skb_pull(skb, 2); | |
1674 | #else | |
1675 | ppp->last_recv = jiffies; | |
1676 | #endif /* CONFIG_PPP_FILTER */ | |
1677 | ||
1678 | if ((ppp->dev->flags & IFF_UP) == 0 | |
1679 | || ppp->npmode[npi] != NPMODE_PASS) { | |
1680 | kfree_skb(skb); | |
1681 | } else { | |
cbb042f9 HX |
1682 | /* chop off protocol */ |
1683 | skb_pull_rcsum(skb, 2); | |
1da177e4 LT |
1684 | skb->dev = ppp->dev; |
1685 | skb->protocol = htons(npindex_to_ethertype[npi]); | |
459a98ed | 1686 | skb_reset_mac_header(skb); |
1da177e4 LT |
1687 | netif_rx(skb); |
1688 | ppp->dev->last_rx = jiffies; | |
1689 | } | |
1690 | } | |
1691 | return; | |
1692 | ||
1693 | err: | |
1694 | kfree_skb(skb); | |
1695 | ppp_receive_error(ppp); | |
1696 | } | |
1697 | ||
1698 | static struct sk_buff * | |
1699 | ppp_decompress_frame(struct ppp *ppp, struct sk_buff *skb) | |
1700 | { | |
1701 | int proto = PPP_PROTO(skb); | |
1702 | struct sk_buff *ns; | |
1703 | int len; | |
1704 | ||
1705 | /* Until we fix all the decompressor's need to make sure | |
1706 | * data portion is linear. | |
1707 | */ | |
1708 | if (!pskb_may_pull(skb, skb->len)) | |
1709 | goto err; | |
1710 | ||
1711 | if (proto == PPP_COMP) { | |
1712 | ns = dev_alloc_skb(ppp->mru + PPP_HDRLEN); | |
1713 | if (ns == 0) { | |
1714 | printk(KERN_ERR "ppp_decompress_frame: no memory\n"); | |
1715 | goto err; | |
1716 | } | |
1717 | /* the decompressor still expects the A/C bytes in the hdr */ | |
1718 | len = ppp->rcomp->decompress(ppp->rc_state, skb->data - 2, | |
1719 | skb->len + 2, ns->data, ppp->mru + PPP_HDRLEN); | |
1720 | if (len < 0) { | |
1721 | /* Pass the compressed frame to pppd as an | |
1722 | error indication. */ | |
1723 | if (len == DECOMP_FATALERROR) | |
1724 | ppp->rstate |= SC_DC_FERROR; | |
1725 | kfree_skb(ns); | |
1726 | goto err; | |
1727 | } | |
1728 | ||
1729 | kfree_skb(skb); | |
1730 | skb = ns; | |
1731 | skb_put(skb, len); | |
1732 | skb_pull(skb, 2); /* pull off the A/C bytes */ | |
1733 | ||
1734 | } else { | |
1735 | /* Uncompressed frame - pass to decompressor so it | |
1736 | can update its dictionary if necessary. */ | |
1737 | if (ppp->rcomp->incomp) | |
1738 | ppp->rcomp->incomp(ppp->rc_state, skb->data - 2, | |
1739 | skb->len + 2); | |
1740 | } | |
1741 | ||
1742 | return skb; | |
1743 | ||
1744 | err: | |
1745 | ppp->rstate |= SC_DC_ERROR; | |
1746 | ppp_receive_error(ppp); | |
1747 | return skb; | |
1748 | } | |
1749 | ||
1750 | #ifdef CONFIG_PPP_MULTILINK | |
1751 | /* | |
1752 | * Receive a multilink frame. | |
1753 | * We put it on the reconstruction queue and then pull off | |
1754 | * as many completed frames as we can. | |
1755 | */ | |
1756 | static void | |
1757 | ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) | |
1758 | { | |
1759 | u32 mask, seq; | |
81616c5a | 1760 | struct channel *ch; |
1da177e4 LT |
1761 | int mphdrlen = (ppp->flags & SC_MP_SHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN; |
1762 | ||
516cd15f | 1763 | if (!pskb_may_pull(skb, mphdrlen) || ppp->mrru == 0) |
1da177e4 LT |
1764 | goto err; /* no good, throw it away */ |
1765 | ||
1766 | /* Decode sequence number and begin/end bits */ | |
1767 | if (ppp->flags & SC_MP_SHORTSEQ) { | |
1768 | seq = ((skb->data[2] & 0x0f) << 8) | skb->data[3]; | |
1769 | mask = 0xfff; | |
1770 | } else { | |
1771 | seq = (skb->data[3] << 16) | (skb->data[4] << 8)| skb->data[5]; | |
1772 | mask = 0xffffff; | |
1773 | } | |
1774 | skb->BEbits = skb->data[2]; | |
1775 | skb_pull(skb, mphdrlen); /* pull off PPP and MP headers */ | |
1776 | ||
1777 | /* | |
1778 | * Do protocol ID decompression on the first fragment of each packet. | |
1779 | */ | |
1780 | if ((skb->BEbits & B) && (skb->data[0] & 1)) | |
1781 | *skb_push(skb, 1) = 0; | |
1782 | ||
1783 | /* | |
1784 | * Expand sequence number to 32 bits, making it as close | |
1785 | * as possible to ppp->minseq. | |
1786 | */ | |
1787 | seq |= ppp->minseq & ~mask; | |
1788 | if ((int)(ppp->minseq - seq) > (int)(mask >> 1)) | |
1789 | seq += mask + 1; | |
1790 | else if ((int)(seq - ppp->minseq) > (int)(mask >> 1)) | |
1791 | seq -= mask + 1; /* should never happen */ | |
1792 | skb->sequence = seq; | |
1793 | pch->lastseq = seq; | |
1794 | ||
1795 | /* | |
1796 | * If this packet comes before the next one we were expecting, | |
1797 | * drop it. | |
1798 | */ | |
1799 | if (seq_before(seq, ppp->nextseq)) { | |
1800 | kfree_skb(skb); | |
1801 | ++ppp->stats.rx_dropped; | |
1802 | ppp_receive_error(ppp); | |
1803 | return; | |
1804 | } | |
1805 | ||
1806 | /* | |
1807 | * Reevaluate minseq, the minimum over all channels of the | |
1808 | * last sequence number received on each channel. Because of | |
1809 | * the increasing sequence number rule, we know that any fragment | |
1810 | * before `minseq' which hasn't arrived is never going to arrive. | |
1811 | * The list of channels can't change because we have the receive | |
1812 | * side of the ppp unit locked. | |
1813 | */ | |
81616c5a | 1814 | list_for_each_entry(ch, &ppp->channels, clist) { |
1da177e4 LT |
1815 | if (seq_before(ch->lastseq, seq)) |
1816 | seq = ch->lastseq; | |
1817 | } | |
1818 | if (seq_before(ppp->minseq, seq)) | |
1819 | ppp->minseq = seq; | |
1820 | ||
1821 | /* Put the fragment on the reconstruction queue */ | |
1822 | ppp_mp_insert(ppp, skb); | |
1823 | ||
1824 | /* If the queue is getting long, don't wait any longer for packets | |
1825 | before the start of the queue. */ | |
1826 | if (skb_queue_len(&ppp->mrq) >= PPP_MP_MAX_QLEN | |
1827 | && seq_before(ppp->minseq, ppp->mrq.next->sequence)) | |
1828 | ppp->minseq = ppp->mrq.next->sequence; | |
1829 | ||
1830 | /* Pull completed packets off the queue and receive them. */ | |
1831 | while ((skb = ppp_mp_reconstruct(ppp)) != 0) | |
1832 | ppp_receive_nonmp_frame(ppp, skb); | |
1833 | ||
1834 | return; | |
1835 | ||
1836 | err: | |
1837 | kfree_skb(skb); | |
1838 | ppp_receive_error(ppp); | |
1839 | } | |
1840 | ||
1841 | /* | |
1842 | * Insert a fragment on the MP reconstruction queue. | |
1843 | * The queue is ordered by increasing sequence number. | |
1844 | */ | |
1845 | static void | |
1846 | ppp_mp_insert(struct ppp *ppp, struct sk_buff *skb) | |
1847 | { | |
1848 | struct sk_buff *p; | |
1849 | struct sk_buff_head *list = &ppp->mrq; | |
1850 | u32 seq = skb->sequence; | |
1851 | ||
1852 | /* N.B. we don't need to lock the list lock because we have the | |
1853 | ppp unit receive-side lock. */ | |
1854 | for (p = list->next; p != (struct sk_buff *)list; p = p->next) | |
1855 | if (seq_before(seq, p->sequence)) | |
1856 | break; | |
1857 | __skb_insert(skb, p->prev, p, list); | |
1858 | } | |
1859 | ||
1860 | /* | |
1861 | * Reconstruct a packet from the MP fragment queue. | |
1862 | * We go through increasing sequence numbers until we find a | |
1863 | * complete packet, or we get to the sequence number for a fragment | |
1864 | * which hasn't arrived but might still do so. | |
1865 | */ | |
1866 | struct sk_buff * | |
1867 | ppp_mp_reconstruct(struct ppp *ppp) | |
1868 | { | |
1869 | u32 seq = ppp->nextseq; | |
1870 | u32 minseq = ppp->minseq; | |
1871 | struct sk_buff_head *list = &ppp->mrq; | |
1872 | struct sk_buff *p, *next; | |
1873 | struct sk_buff *head, *tail; | |
1874 | struct sk_buff *skb = NULL; | |
1875 | int lost = 0, len = 0; | |
1876 | ||
1877 | if (ppp->mrru == 0) /* do nothing until mrru is set */ | |
1878 | return NULL; | |
1879 | head = list->next; | |
1880 | tail = NULL; | |
1881 | for (p = head; p != (struct sk_buff *) list; p = next) { | |
1882 | next = p->next; | |
1883 | if (seq_before(p->sequence, seq)) { | |
1884 | /* this can't happen, anyway ignore the skb */ | |
1885 | printk(KERN_ERR "ppp_mp_reconstruct bad seq %u < %u\n", | |
1886 | p->sequence, seq); | |
1887 | head = next; | |
1888 | continue; | |
1889 | } | |
1890 | if (p->sequence != seq) { | |
1891 | /* Fragment `seq' is missing. If it is after | |
1892 | minseq, it might arrive later, so stop here. */ | |
1893 | if (seq_after(seq, minseq)) | |
1894 | break; | |
1895 | /* Fragment `seq' is lost, keep going. */ | |
1896 | lost = 1; | |
1897 | seq = seq_before(minseq, p->sequence)? | |
1898 | minseq + 1: p->sequence; | |
1899 | next = p; | |
1900 | continue; | |
1901 | } | |
1902 | ||
1903 | /* | |
1904 | * At this point we know that all the fragments from | |
1905 | * ppp->nextseq to seq are either present or lost. | |
1906 | * Also, there are no complete packets in the queue | |
1907 | * that have no missing fragments and end before this | |
1908 | * fragment. | |
1909 | */ | |
1910 | ||
1911 | /* B bit set indicates this fragment starts a packet */ | |
1912 | if (p->BEbits & B) { | |
1913 | head = p; | |
1914 | lost = 0; | |
1915 | len = 0; | |
1916 | } | |
1917 | ||
1918 | len += p->len; | |
1919 | ||
1920 | /* Got a complete packet yet? */ | |
1921 | if (lost == 0 && (p->BEbits & E) && (head->BEbits & B)) { | |
1922 | if (len > ppp->mrru + 2) { | |
1923 | ++ppp->stats.rx_length_errors; | |
1924 | printk(KERN_DEBUG "PPP: reconstructed packet" | |
1925 | " is too long (%d)\n", len); | |
1926 | } else if (p == head) { | |
1927 | /* fragment is complete packet - reuse skb */ | |
1928 | tail = p; | |
1929 | skb = skb_get(p); | |
1930 | break; | |
1931 | } else if ((skb = dev_alloc_skb(len)) == NULL) { | |
1932 | ++ppp->stats.rx_missed_errors; | |
1933 | printk(KERN_DEBUG "PPP: no memory for " | |
1934 | "reconstructed packet"); | |
1935 | } else { | |
1936 | tail = p; | |
1937 | break; | |
1938 | } | |
1939 | ppp->nextseq = seq + 1; | |
1940 | } | |
1941 | ||
1942 | /* | |
1943 | * If this is the ending fragment of a packet, | |
1944 | * and we haven't found a complete valid packet yet, | |
1945 | * we can discard up to and including this fragment. | |
1946 | */ | |
1947 | if (p->BEbits & E) | |
1948 | head = next; | |
1949 | ||
1950 | ++seq; | |
1951 | } | |
1952 | ||
1953 | /* If we have a complete packet, copy it all into one skb. */ | |
1954 | if (tail != NULL) { | |
1955 | /* If we have discarded any fragments, | |
1956 | signal a receive error. */ | |
1957 | if (head->sequence != ppp->nextseq) { | |
1958 | if (ppp->debug & 1) | |
1959 | printk(KERN_DEBUG " missed pkts %u..%u\n", | |
1960 | ppp->nextseq, head->sequence-1); | |
1961 | ++ppp->stats.rx_dropped; | |
1962 | ppp_receive_error(ppp); | |
1963 | } | |
1964 | ||
1965 | if (head != tail) | |
1966 | /* copy to a single skb */ | |
1967 | for (p = head; p != tail->next; p = p->next) | |
1968 | skb_copy_bits(p, 0, skb_put(skb, p->len), p->len); | |
1969 | ppp->nextseq = tail->sequence + 1; | |
1970 | head = tail->next; | |
1971 | } | |
1972 | ||
1973 | /* Discard all the skbuffs that we have copied the data out of | |
1974 | or that we can't use. */ | |
1975 | while ((p = list->next) != head) { | |
1976 | __skb_unlink(p, list); | |
1977 | kfree_skb(p); | |
1978 | } | |
1979 | ||
1980 | return skb; | |
1981 | } | |
1982 | #endif /* CONFIG_PPP_MULTILINK */ | |
1983 | ||
1984 | /* | |
1985 | * Channel interface. | |
1986 | */ | |
1987 | ||
1988 | /* | |
1989 | * Create a new, unattached ppp channel. | |
1990 | */ | |
1991 | int | |
1992 | ppp_register_channel(struct ppp_channel *chan) | |
1993 | { | |
1994 | struct channel *pch; | |
1995 | ||
d4274b51 | 1996 | pch = kzalloc(sizeof(struct channel), GFP_KERNEL); |
1da177e4 LT |
1997 | if (pch == 0) |
1998 | return -ENOMEM; | |
1da177e4 LT |
1999 | pch->ppp = NULL; |
2000 | pch->chan = chan; | |
2001 | chan->ppp = pch; | |
2002 | init_ppp_file(&pch->file, CHANNEL); | |
2003 | pch->file.hdrlen = chan->hdrlen; | |
2004 | #ifdef CONFIG_PPP_MULTILINK | |
2005 | pch->lastseq = -1; | |
2006 | #endif /* CONFIG_PPP_MULTILINK */ | |
2007 | init_rwsem(&pch->chan_sem); | |
2008 | spin_lock_init(&pch->downl); | |
2009 | rwlock_init(&pch->upl); | |
2010 | spin_lock_bh(&all_channels_lock); | |
2011 | pch->file.index = ++last_channel_index; | |
2012 | list_add(&pch->list, &new_channels); | |
2013 | atomic_inc(&channel_count); | |
2014 | spin_unlock_bh(&all_channels_lock); | |
2015 | return 0; | |
2016 | } | |
2017 | ||
2018 | /* | |
2019 | * Return the index of a channel. | |
2020 | */ | |
2021 | int ppp_channel_index(struct ppp_channel *chan) | |
2022 | { | |
2023 | struct channel *pch = chan->ppp; | |
2024 | ||
2025 | if (pch != 0) | |
2026 | return pch->file.index; | |
2027 | return -1; | |
2028 | } | |
2029 | ||
2030 | /* | |
2031 | * Return the PPP unit number to which a channel is connected. | |
2032 | */ | |
2033 | int ppp_unit_number(struct ppp_channel *chan) | |
2034 | { | |
2035 | struct channel *pch = chan->ppp; | |
2036 | int unit = -1; | |
2037 | ||
2038 | if (pch != 0) { | |
2039 | read_lock_bh(&pch->upl); | |
2040 | if (pch->ppp != 0) | |
2041 | unit = pch->ppp->file.index; | |
2042 | read_unlock_bh(&pch->upl); | |
2043 | } | |
2044 | return unit; | |
2045 | } | |
2046 | ||
2047 | /* | |
2048 | * Disconnect a channel from the generic layer. | |
2049 | * This must be called in process context. | |
2050 | */ | |
2051 | void | |
2052 | ppp_unregister_channel(struct ppp_channel *chan) | |
2053 | { | |
2054 | struct channel *pch = chan->ppp; | |
2055 | ||
2056 | if (pch == 0) | |
2057 | return; /* should never happen */ | |
2058 | chan->ppp = NULL; | |
2059 | ||
2060 | /* | |
2061 | * This ensures that we have returned from any calls into the | |
2062 | * the channel's start_xmit or ioctl routine before we proceed. | |
2063 | */ | |
2064 | down_write(&pch->chan_sem); | |
2065 | spin_lock_bh(&pch->downl); | |
2066 | pch->chan = NULL; | |
2067 | spin_unlock_bh(&pch->downl); | |
2068 | up_write(&pch->chan_sem); | |
2069 | ppp_disconnect_channel(pch); | |
2070 | spin_lock_bh(&all_channels_lock); | |
2071 | list_del(&pch->list); | |
2072 | spin_unlock_bh(&all_channels_lock); | |
2073 | pch->file.dead = 1; | |
2074 | wake_up_interruptible(&pch->file.rwait); | |
2075 | if (atomic_dec_and_test(&pch->file.refcnt)) | |
2076 | ppp_destroy_channel(pch); | |
2077 | } | |
2078 | ||
2079 | /* | |
2080 | * Callback from a channel when it can accept more to transmit. | |
2081 | * This should be called at BH/softirq level, not interrupt level. | |
2082 | */ | |
2083 | void | |
2084 | ppp_output_wakeup(struct ppp_channel *chan) | |
2085 | { | |
2086 | struct channel *pch = chan->ppp; | |
2087 | ||
2088 | if (pch == 0) | |
2089 | return; | |
2090 | ppp_channel_push(pch); | |
2091 | } | |
2092 | ||
2093 | /* | |
2094 | * Compression control. | |
2095 | */ | |
2096 | ||
2097 | /* Process the PPPIOCSCOMPRESS ioctl. */ | |
2098 | static int | |
2099 | ppp_set_compress(struct ppp *ppp, unsigned long arg) | |
2100 | { | |
2101 | int err; | |
2102 | struct compressor *cp, *ocomp; | |
2103 | struct ppp_option_data data; | |
2104 | void *state, *ostate; | |
2105 | unsigned char ccp_option[CCP_MAX_OPTION_LENGTH]; | |
2106 | ||
2107 | err = -EFAULT; | |
2108 | if (copy_from_user(&data, (void __user *) arg, sizeof(data)) | |
2109 | || (data.length <= CCP_MAX_OPTION_LENGTH | |
2110 | && copy_from_user(ccp_option, (void __user *) data.ptr, data.length))) | |
2111 | goto out; | |
2112 | err = -EINVAL; | |
2113 | if (data.length > CCP_MAX_OPTION_LENGTH | |
2114 | || ccp_option[1] < 2 || ccp_option[1] > data.length) | |
2115 | goto out; | |
2116 | ||
2117 | cp = find_compressor(ccp_option[0]); | |
2118 | #ifdef CONFIG_KMOD | |
2119 | if (cp == 0) { | |
2120 | request_module("ppp-compress-%d", ccp_option[0]); | |
2121 | cp = find_compressor(ccp_option[0]); | |
2122 | } | |
2123 | #endif /* CONFIG_KMOD */ | |
2124 | if (cp == 0) | |
2125 | goto out; | |
2126 | ||
2127 | err = -ENOBUFS; | |
2128 | if (data.transmit) { | |
2129 | state = cp->comp_alloc(ccp_option, data.length); | |
2130 | if (state != 0) { | |
2131 | ppp_xmit_lock(ppp); | |
2132 | ppp->xstate &= ~SC_COMP_RUN; | |
2133 | ocomp = ppp->xcomp; | |
2134 | ostate = ppp->xc_state; | |
2135 | ppp->xcomp = cp; | |
2136 | ppp->xc_state = state; | |
2137 | ppp_xmit_unlock(ppp); | |
2138 | if (ostate != 0) { | |
2139 | ocomp->comp_free(ostate); | |
2140 | module_put(ocomp->owner); | |
2141 | } | |
2142 | err = 0; | |
2143 | } else | |
2144 | module_put(cp->owner); | |
2145 | ||
2146 | } else { | |
2147 | state = cp->decomp_alloc(ccp_option, data.length); | |
2148 | if (state != 0) { | |
2149 | ppp_recv_lock(ppp); | |
2150 | ppp->rstate &= ~SC_DECOMP_RUN; | |
2151 | ocomp = ppp->rcomp; | |
2152 | ostate = ppp->rc_state; | |
2153 | ppp->rcomp = cp; | |
2154 | ppp->rc_state = state; | |
2155 | ppp_recv_unlock(ppp); | |
2156 | if (ostate != 0) { | |
2157 | ocomp->decomp_free(ostate); | |
2158 | module_put(ocomp->owner); | |
2159 | } | |
2160 | err = 0; | |
2161 | } else | |
2162 | module_put(cp->owner); | |
2163 | } | |
2164 | ||
2165 | out: | |
2166 | return err; | |
2167 | } | |
2168 | ||
2169 | /* | |
2170 | * Look at a CCP packet and update our state accordingly. | |
2171 | * We assume the caller has the xmit or recv path locked. | |
2172 | */ | |
2173 | static void | |
2174 | ppp_ccp_peek(struct ppp *ppp, struct sk_buff *skb, int inbound) | |
2175 | { | |
2176 | unsigned char *dp; | |
2177 | int len; | |
2178 | ||
2179 | if (!pskb_may_pull(skb, CCP_HDRLEN + 2)) | |
2180 | return; /* no header */ | |
2181 | dp = skb->data + 2; | |
2182 | ||
2183 | switch (CCP_CODE(dp)) { | |
2184 | case CCP_CONFREQ: | |
2185 | ||
6aa20a22 | 2186 | /* A ConfReq starts negotiation of compression |
1da177e4 LT |
2187 | * in one direction of transmission, |
2188 | * and hence brings it down...but which way? | |
2189 | * | |
2190 | * Remember: | |
2191 | * A ConfReq indicates what the sender would like to receive | |
2192 | */ | |
2193 | if(inbound) | |
2194 | /* He is proposing what I should send */ | |
2195 | ppp->xstate &= ~SC_COMP_RUN; | |
6aa20a22 | 2196 | else |
1da177e4 LT |
2197 | /* I am proposing to what he should send */ |
2198 | ppp->rstate &= ~SC_DECOMP_RUN; | |
6aa20a22 | 2199 | |
1da177e4 | 2200 | break; |
6aa20a22 | 2201 | |
1da177e4 LT |
2202 | case CCP_TERMREQ: |
2203 | case CCP_TERMACK: | |
2204 | /* | |
6aa20a22 | 2205 | * CCP is going down, both directions of transmission |
1da177e4 LT |
2206 | */ |
2207 | ppp->rstate &= ~SC_DECOMP_RUN; | |
2208 | ppp->xstate &= ~SC_COMP_RUN; | |
2209 | break; | |
2210 | ||
2211 | case CCP_CONFACK: | |
2212 | if ((ppp->flags & (SC_CCP_OPEN | SC_CCP_UP)) != SC_CCP_OPEN) | |
2213 | break; | |
2214 | len = CCP_LENGTH(dp); | |
2215 | if (!pskb_may_pull(skb, len + 2)) | |
2216 | return; /* too short */ | |
2217 | dp += CCP_HDRLEN; | |
2218 | len -= CCP_HDRLEN; | |
2219 | if (len < CCP_OPT_MINLEN || len < CCP_OPT_LENGTH(dp)) | |
2220 | break; | |
2221 | if (inbound) { | |
2222 | /* we will start receiving compressed packets */ | |
2223 | if (ppp->rc_state == 0) | |
2224 | break; | |
2225 | if (ppp->rcomp->decomp_init(ppp->rc_state, dp, len, | |
2226 | ppp->file.index, 0, ppp->mru, ppp->debug)) { | |
2227 | ppp->rstate |= SC_DECOMP_RUN; | |
2228 | ppp->rstate &= ~(SC_DC_ERROR | SC_DC_FERROR); | |
2229 | } | |
2230 | } else { | |
2231 | /* we will soon start sending compressed packets */ | |
2232 | if (ppp->xc_state == 0) | |
2233 | break; | |
2234 | if (ppp->xcomp->comp_init(ppp->xc_state, dp, len, | |
2235 | ppp->file.index, 0, ppp->debug)) | |
2236 | ppp->xstate |= SC_COMP_RUN; | |
2237 | } | |
2238 | break; | |
2239 | ||
2240 | case CCP_RESETACK: | |
2241 | /* reset the [de]compressor */ | |
2242 | if ((ppp->flags & SC_CCP_UP) == 0) | |
2243 | break; | |
2244 | if (inbound) { | |
2245 | if (ppp->rc_state && (ppp->rstate & SC_DECOMP_RUN)) { | |
2246 | ppp->rcomp->decomp_reset(ppp->rc_state); | |
2247 | ppp->rstate &= ~SC_DC_ERROR; | |
2248 | } | |
2249 | } else { | |
2250 | if (ppp->xc_state && (ppp->xstate & SC_COMP_RUN)) | |
2251 | ppp->xcomp->comp_reset(ppp->xc_state); | |
2252 | } | |
2253 | break; | |
2254 | } | |
2255 | } | |
2256 | ||
2257 | /* Free up compression resources. */ | |
2258 | static void | |
2259 | ppp_ccp_closed(struct ppp *ppp) | |
2260 | { | |
2261 | void *xstate, *rstate; | |
2262 | struct compressor *xcomp, *rcomp; | |
2263 | ||
2264 | ppp_lock(ppp); | |
2265 | ppp->flags &= ~(SC_CCP_OPEN | SC_CCP_UP); | |
2266 | ppp->xstate = 0; | |
2267 | xcomp = ppp->xcomp; | |
2268 | xstate = ppp->xc_state; | |
2269 | ppp->xc_state = NULL; | |
2270 | ppp->rstate = 0; | |
2271 | rcomp = ppp->rcomp; | |
2272 | rstate = ppp->rc_state; | |
2273 | ppp->rc_state = NULL; | |
2274 | ppp_unlock(ppp); | |
2275 | ||
2276 | if (xstate) { | |
2277 | xcomp->comp_free(xstate); | |
2278 | module_put(xcomp->owner); | |
2279 | } | |
2280 | if (rstate) { | |
2281 | rcomp->decomp_free(rstate); | |
2282 | module_put(rcomp->owner); | |
2283 | } | |
2284 | } | |
2285 | ||
2286 | /* List of compressors. */ | |
2287 | static LIST_HEAD(compressor_list); | |
2288 | static DEFINE_SPINLOCK(compressor_list_lock); | |
2289 | ||
2290 | struct compressor_entry { | |
2291 | struct list_head list; | |
2292 | struct compressor *comp; | |
2293 | }; | |
2294 | ||
2295 | static struct compressor_entry * | |
2296 | find_comp_entry(int proto) | |
2297 | { | |
2298 | struct compressor_entry *ce; | |
1da177e4 | 2299 | |
81616c5a | 2300 | list_for_each_entry(ce, &compressor_list, list) { |
1da177e4 LT |
2301 | if (ce->comp->compress_proto == proto) |
2302 | return ce; | |
2303 | } | |
2304 | return NULL; | |
2305 | } | |
2306 | ||
2307 | /* Register a compressor */ | |
2308 | int | |
2309 | ppp_register_compressor(struct compressor *cp) | |
2310 | { | |
2311 | struct compressor_entry *ce; | |
2312 | int ret; | |
2313 | spin_lock(&compressor_list_lock); | |
2314 | ret = -EEXIST; | |
2315 | if (find_comp_entry(cp->compress_proto) != 0) | |
2316 | goto out; | |
2317 | ret = -ENOMEM; | |
2318 | ce = kmalloc(sizeof(struct compressor_entry), GFP_ATOMIC); | |
2319 | if (ce == 0) | |
2320 | goto out; | |
2321 | ret = 0; | |
2322 | ce->comp = cp; | |
2323 | list_add(&ce->list, &compressor_list); | |
2324 | out: | |
2325 | spin_unlock(&compressor_list_lock); | |
2326 | return ret; | |
2327 | } | |
2328 | ||
2329 | /* Unregister a compressor */ | |
2330 | void | |
2331 | ppp_unregister_compressor(struct compressor *cp) | |
2332 | { | |
2333 | struct compressor_entry *ce; | |
2334 | ||
2335 | spin_lock(&compressor_list_lock); | |
2336 | ce = find_comp_entry(cp->compress_proto); | |
2337 | if (ce != 0 && ce->comp == cp) { | |
2338 | list_del(&ce->list); | |
2339 | kfree(ce); | |
2340 | } | |
2341 | spin_unlock(&compressor_list_lock); | |
2342 | } | |
2343 | ||
2344 | /* Find a compressor. */ | |
2345 | static struct compressor * | |
2346 | find_compressor(int type) | |
2347 | { | |
2348 | struct compressor_entry *ce; | |
2349 | struct compressor *cp = NULL; | |
2350 | ||
2351 | spin_lock(&compressor_list_lock); | |
2352 | ce = find_comp_entry(type); | |
2353 | if (ce != 0) { | |
2354 | cp = ce->comp; | |
2355 | if (!try_module_get(cp->owner)) | |
2356 | cp = NULL; | |
2357 | } | |
2358 | spin_unlock(&compressor_list_lock); | |
2359 | return cp; | |
2360 | } | |
2361 | ||
2362 | /* | |
2363 | * Miscelleneous stuff. | |
2364 | */ | |
2365 | ||
2366 | static void | |
2367 | ppp_get_stats(struct ppp *ppp, struct ppp_stats *st) | |
2368 | { | |
2369 | struct slcompress *vj = ppp->vj; | |
2370 | ||
2371 | memset(st, 0, sizeof(*st)); | |
2372 | st->p.ppp_ipackets = ppp->stats.rx_packets; | |
2373 | st->p.ppp_ierrors = ppp->stats.rx_errors; | |
2374 | st->p.ppp_ibytes = ppp->stats.rx_bytes; | |
2375 | st->p.ppp_opackets = ppp->stats.tx_packets; | |
2376 | st->p.ppp_oerrors = ppp->stats.tx_errors; | |
2377 | st->p.ppp_obytes = ppp->stats.tx_bytes; | |
2378 | if (vj == 0) | |
2379 | return; | |
2380 | st->vj.vjs_packets = vj->sls_o_compressed + vj->sls_o_uncompressed; | |
2381 | st->vj.vjs_compressed = vj->sls_o_compressed; | |
2382 | st->vj.vjs_searches = vj->sls_o_searches; | |
2383 | st->vj.vjs_misses = vj->sls_o_misses; | |
2384 | st->vj.vjs_errorin = vj->sls_i_error; | |
2385 | st->vj.vjs_tossed = vj->sls_i_tossed; | |
2386 | st->vj.vjs_uncompressedin = vj->sls_i_uncompressed; | |
2387 | st->vj.vjs_compressedin = vj->sls_i_compressed; | |
2388 | } | |
2389 | ||
2390 | /* | |
2391 | * Stuff for handling the lists of ppp units and channels | |
2392 | * and for initialization. | |
2393 | */ | |
2394 | ||
2395 | /* | |
2396 | * Create a new ppp interface unit. Fails if it can't allocate memory | |
2397 | * or if there is already a unit with the requested number. | |
2398 | * unit == -1 means allocate a new number. | |
2399 | */ | |
2400 | static struct ppp * | |
2401 | ppp_create_interface(int unit, int *retp) | |
2402 | { | |
2403 | struct ppp *ppp; | |
2404 | struct net_device *dev = NULL; | |
2405 | int ret = -ENOMEM; | |
2406 | int i; | |
2407 | ||
d4274b51 | 2408 | ppp = kzalloc(sizeof(struct ppp), GFP_KERNEL); |
1da177e4 LT |
2409 | if (!ppp) |
2410 | goto out; | |
2411 | dev = alloc_netdev(0, "", ppp_setup); | |
2412 | if (!dev) | |
2413 | goto out1; | |
1da177e4 LT |
2414 | |
2415 | ppp->mru = PPP_MRU; | |
2416 | init_ppp_file(&ppp->file, INTERFACE); | |
2417 | ppp->file.hdrlen = PPP_HDRLEN - 2; /* don't count proto bytes */ | |
2418 | for (i = 0; i < NUM_NP; ++i) | |
2419 | ppp->npmode[i] = NPMODE_PASS; | |
2420 | INIT_LIST_HEAD(&ppp->channels); | |
2421 | spin_lock_init(&ppp->rlock); | |
2422 | spin_lock_init(&ppp->wlock); | |
2423 | #ifdef CONFIG_PPP_MULTILINK | |
2424 | ppp->minseq = -1; | |
2425 | skb_queue_head_init(&ppp->mrq); | |
2426 | #endif /* CONFIG_PPP_MULTILINK */ | |
2427 | ppp->dev = dev; | |
2428 | dev->priv = ppp; | |
2429 | ||
2430 | dev->hard_start_xmit = ppp_start_xmit; | |
2431 | dev->get_stats = ppp_net_stats; | |
2432 | dev->do_ioctl = ppp_net_ioctl; | |
2433 | ||
2434 | ret = -EEXIST; | |
8ed965d6 | 2435 | mutex_lock(&all_ppp_mutex); |
1da177e4 LT |
2436 | if (unit < 0) |
2437 | unit = cardmap_find_first_free(all_ppp_units); | |
2438 | else if (cardmap_get(all_ppp_units, unit) != NULL) | |
2439 | goto out2; /* unit already exists */ | |
2440 | ||
2441 | /* Initialize the new ppp unit */ | |
2442 | ppp->file.index = unit; | |
2443 | sprintf(dev->name, "ppp%d", unit); | |
2444 | ||
2445 | ret = register_netdev(dev); | |
2446 | if (ret != 0) { | |
2447 | printk(KERN_ERR "PPP: couldn't register device %s (%d)\n", | |
2448 | dev->name, ret); | |
2449 | goto out2; | |
2450 | } | |
2451 | ||
2452 | atomic_inc(&ppp_unit_count); | |
d4274b51 PI |
2453 | ret = cardmap_set(&all_ppp_units, unit, ppp); |
2454 | if (ret != 0) | |
2455 | goto out3; | |
2456 | ||
8ed965d6 | 2457 | mutex_unlock(&all_ppp_mutex); |
1da177e4 LT |
2458 | *retp = 0; |
2459 | return ppp; | |
2460 | ||
d4274b51 PI |
2461 | out3: |
2462 | atomic_dec(&ppp_unit_count); | |
1da177e4 | 2463 | out2: |
8ed965d6 | 2464 | mutex_unlock(&all_ppp_mutex); |
1da177e4 LT |
2465 | free_netdev(dev); |
2466 | out1: | |
2467 | kfree(ppp); | |
2468 | out: | |
2469 | *retp = ret; | |
2470 | return NULL; | |
2471 | } | |
2472 | ||
2473 | /* | |
2474 | * Initialize a ppp_file structure. | |
2475 | */ | |
2476 | static void | |
2477 | init_ppp_file(struct ppp_file *pf, int kind) | |
2478 | { | |
2479 | pf->kind = kind; | |
2480 | skb_queue_head_init(&pf->xq); | |
2481 | skb_queue_head_init(&pf->rq); | |
2482 | atomic_set(&pf->refcnt, 1); | |
2483 | init_waitqueue_head(&pf->rwait); | |
2484 | } | |
2485 | ||
2486 | /* | |
2487 | * Take down a ppp interface unit - called when the owning file | |
2488 | * (the one that created the unit) is closed or detached. | |
2489 | */ | |
2490 | static void ppp_shutdown_interface(struct ppp *ppp) | |
2491 | { | |
2492 | struct net_device *dev; | |
2493 | ||
8ed965d6 | 2494 | mutex_lock(&all_ppp_mutex); |
1da177e4 LT |
2495 | ppp_lock(ppp); |
2496 | dev = ppp->dev; | |
2497 | ppp->dev = NULL; | |
2498 | ppp_unlock(ppp); | |
2499 | /* This will call dev_close() for us. */ | |
2500 | if (dev) { | |
2501 | unregister_netdev(dev); | |
2502 | free_netdev(dev); | |
2503 | } | |
2504 | cardmap_set(&all_ppp_units, ppp->file.index, NULL); | |
2505 | ppp->file.dead = 1; | |
2506 | ppp->owner = NULL; | |
2507 | wake_up_interruptible(&ppp->file.rwait); | |
8ed965d6 | 2508 | mutex_unlock(&all_ppp_mutex); |
1da177e4 LT |
2509 | } |
2510 | ||
2511 | /* | |
2512 | * Free the memory used by a ppp unit. This is only called once | |
2513 | * there are no channels connected to the unit and no file structs | |
2514 | * that reference the unit. | |
2515 | */ | |
2516 | static void ppp_destroy_interface(struct ppp *ppp) | |
2517 | { | |
2518 | atomic_dec(&ppp_unit_count); | |
2519 | ||
2520 | if (!ppp->file.dead || ppp->n_channels) { | |
2521 | /* "can't happen" */ | |
2522 | printk(KERN_ERR "ppp: destroying ppp struct %p but dead=%d " | |
2523 | "n_channels=%d !\n", ppp, ppp->file.dead, | |
2524 | ppp->n_channels); | |
2525 | return; | |
2526 | } | |
2527 | ||
2528 | ppp_ccp_closed(ppp); | |
2529 | if (ppp->vj) { | |
2530 | slhc_free(ppp->vj); | |
2531 | ppp->vj = NULL; | |
2532 | } | |
2533 | skb_queue_purge(&ppp->file.xq); | |
2534 | skb_queue_purge(&ppp->file.rq); | |
2535 | #ifdef CONFIG_PPP_MULTILINK | |
2536 | skb_queue_purge(&ppp->mrq); | |
2537 | #endif /* CONFIG_PPP_MULTILINK */ | |
2538 | #ifdef CONFIG_PPP_FILTER | |
96edf83c JJ |
2539 | kfree(ppp->pass_filter); |
2540 | ppp->pass_filter = NULL; | |
2541 | kfree(ppp->active_filter); | |
2542 | ppp->active_filter = NULL; | |
1da177e4 LT |
2543 | #endif /* CONFIG_PPP_FILTER */ |
2544 | ||
165de5b7 L |
2545 | if (ppp->xmit_pending) |
2546 | kfree_skb(ppp->xmit_pending); | |
2547 | ||
1da177e4 LT |
2548 | kfree(ppp); |
2549 | } | |
2550 | ||
2551 | /* | |
2552 | * Locate an existing ppp unit. | |
8ed965d6 | 2553 | * The caller should have locked the all_ppp_mutex. |
1da177e4 LT |
2554 | */ |
2555 | static struct ppp * | |
2556 | ppp_find_unit(int unit) | |
2557 | { | |
2558 | return cardmap_get(all_ppp_units, unit); | |
2559 | } | |
2560 | ||
2561 | /* | |
2562 | * Locate an existing ppp channel. | |
2563 | * The caller should have locked the all_channels_lock. | |
2564 | * First we look in the new_channels list, then in the | |
2565 | * all_channels list. If found in the new_channels list, | |
2566 | * we move it to the all_channels list. This is for speed | |
2567 | * when we have a lot of channels in use. | |
2568 | */ | |
2569 | static struct channel * | |
2570 | ppp_find_channel(int unit) | |
2571 | { | |
2572 | struct channel *pch; | |
1da177e4 | 2573 | |
81616c5a | 2574 | list_for_each_entry(pch, &new_channels, list) { |
1da177e4 | 2575 | if (pch->file.index == unit) { |
179e0917 | 2576 | list_move(&pch->list, &all_channels); |
1da177e4 LT |
2577 | return pch; |
2578 | } | |
2579 | } | |
81616c5a | 2580 | list_for_each_entry(pch, &all_channels, list) { |
1da177e4 LT |
2581 | if (pch->file.index == unit) |
2582 | return pch; | |
2583 | } | |
2584 | return NULL; | |
2585 | } | |
2586 | ||
2587 | /* | |
2588 | * Connect a PPP channel to a PPP interface unit. | |
2589 | */ | |
2590 | static int | |
2591 | ppp_connect_channel(struct channel *pch, int unit) | |
2592 | { | |
2593 | struct ppp *ppp; | |
2594 | int ret = -ENXIO; | |
2595 | int hdrlen; | |
2596 | ||
8ed965d6 | 2597 | mutex_lock(&all_ppp_mutex); |
1da177e4 LT |
2598 | ppp = ppp_find_unit(unit); |
2599 | if (ppp == 0) | |
2600 | goto out; | |
2601 | write_lock_bh(&pch->upl); | |
2602 | ret = -EINVAL; | |
2603 | if (pch->ppp != 0) | |
2604 | goto outl; | |
2605 | ||
2606 | ppp_lock(ppp); | |
2607 | if (pch->file.hdrlen > ppp->file.hdrlen) | |
2608 | ppp->file.hdrlen = pch->file.hdrlen; | |
2609 | hdrlen = pch->file.hdrlen + 2; /* for protocol bytes */ | |
2610 | if (ppp->dev && hdrlen > ppp->dev->hard_header_len) | |
2611 | ppp->dev->hard_header_len = hdrlen; | |
2612 | list_add_tail(&pch->clist, &ppp->channels); | |
2613 | ++ppp->n_channels; | |
2614 | pch->ppp = ppp; | |
2615 | atomic_inc(&ppp->file.refcnt); | |
2616 | ppp_unlock(ppp); | |
2617 | ret = 0; | |
2618 | ||
2619 | outl: | |
2620 | write_unlock_bh(&pch->upl); | |
2621 | out: | |
8ed965d6 | 2622 | mutex_unlock(&all_ppp_mutex); |
1da177e4 LT |
2623 | return ret; |
2624 | } | |
2625 | ||
2626 | /* | |
2627 | * Disconnect a channel from its ppp unit. | |
2628 | */ | |
2629 | static int | |
2630 | ppp_disconnect_channel(struct channel *pch) | |
2631 | { | |
2632 | struct ppp *ppp; | |
2633 | int err = -EINVAL; | |
2634 | ||
2635 | write_lock_bh(&pch->upl); | |
2636 | ppp = pch->ppp; | |
2637 | pch->ppp = NULL; | |
2638 | write_unlock_bh(&pch->upl); | |
2639 | if (ppp != 0) { | |
2640 | /* remove it from the ppp unit's list */ | |
2641 | ppp_lock(ppp); | |
2642 | list_del(&pch->clist); | |
2643 | if (--ppp->n_channels == 0) | |
2644 | wake_up_interruptible(&ppp->file.rwait); | |
2645 | ppp_unlock(ppp); | |
2646 | if (atomic_dec_and_test(&ppp->file.refcnt)) | |
2647 | ppp_destroy_interface(ppp); | |
2648 | err = 0; | |
2649 | } | |
2650 | return err; | |
2651 | } | |
2652 | ||
2653 | /* | |
2654 | * Free up the resources used by a ppp channel. | |
2655 | */ | |
2656 | static void ppp_destroy_channel(struct channel *pch) | |
2657 | { | |
2658 | atomic_dec(&channel_count); | |
2659 | ||
2660 | if (!pch->file.dead) { | |
2661 | /* "can't happen" */ | |
2662 | printk(KERN_ERR "ppp: destroying undead channel %p !\n", | |
2663 | pch); | |
2664 | return; | |
2665 | } | |
2666 | skb_queue_purge(&pch->file.xq); | |
2667 | skb_queue_purge(&pch->file.rq); | |
2668 | kfree(pch); | |
2669 | } | |
2670 | ||
2671 | static void __exit ppp_cleanup(void) | |
2672 | { | |
2673 | /* should never happen */ | |
2674 | if (atomic_read(&ppp_unit_count) || atomic_read(&channel_count)) | |
2675 | printk(KERN_ERR "PPP: removing module but units remain!\n"); | |
2676 | cardmap_destroy(&all_ppp_units); | |
2677 | if (unregister_chrdev(PPP_MAJOR, "ppp") != 0) | |
2678 | printk(KERN_ERR "PPP: failed to unregister PPP device\n"); | |
9a6a2a5e | 2679 | device_destroy(ppp_class, MKDEV(PPP_MAJOR, 0)); |
56b22935 | 2680 | class_destroy(ppp_class); |
1da177e4 LT |
2681 | } |
2682 | ||
2683 | /* | |
2684 | * Cardmap implementation. | |
2685 | */ | |
2686 | static void *cardmap_get(struct cardmap *map, unsigned int nr) | |
2687 | { | |
2688 | struct cardmap *p; | |
2689 | int i; | |
2690 | ||
2691 | for (p = map; p != NULL; ) { | |
2692 | if ((i = nr >> p->shift) >= CARDMAP_WIDTH) | |
2693 | return NULL; | |
2694 | if (p->shift == 0) | |
2695 | return p->ptr[i]; | |
2696 | nr &= ~(CARDMAP_MASK << p->shift); | |
2697 | p = p->ptr[i]; | |
2698 | } | |
2699 | return NULL; | |
2700 | } | |
2701 | ||
d4274b51 | 2702 | static int cardmap_set(struct cardmap **pmap, unsigned int nr, void *ptr) |
1da177e4 LT |
2703 | { |
2704 | struct cardmap *p; | |
2705 | int i; | |
2706 | ||
2707 | p = *pmap; | |
2708 | if (p == NULL || (nr >> p->shift) >= CARDMAP_WIDTH) { | |
2709 | do { | |
2710 | /* need a new top level */ | |
d4274b51 PI |
2711 | struct cardmap *np = kzalloc(sizeof(*np), GFP_KERNEL); |
2712 | if (!np) | |
2713 | goto enomem; | |
1da177e4 LT |
2714 | np->ptr[0] = p; |
2715 | if (p != NULL) { | |
2716 | np->shift = p->shift + CARDMAP_ORDER; | |
2717 | p->parent = np; | |
2718 | } else | |
2719 | np->shift = 0; | |
2720 | p = np; | |
2721 | } while ((nr >> p->shift) >= CARDMAP_WIDTH); | |
2722 | *pmap = p; | |
2723 | } | |
2724 | while (p->shift > 0) { | |
2725 | i = (nr >> p->shift) & CARDMAP_MASK; | |
2726 | if (p->ptr[i] == NULL) { | |
d4274b51 PI |
2727 | struct cardmap *np = kzalloc(sizeof(*np), GFP_KERNEL); |
2728 | if (!np) | |
2729 | goto enomem; | |
1da177e4 LT |
2730 | np->shift = p->shift - CARDMAP_ORDER; |
2731 | np->parent = p; | |
2732 | p->ptr[i] = np; | |
2733 | } | |
2734 | if (ptr == NULL) | |
2735 | clear_bit(i, &p->inuse); | |
2736 | p = p->ptr[i]; | |
2737 | } | |
2738 | i = nr & CARDMAP_MASK; | |
2739 | p->ptr[i] = ptr; | |
2740 | if (ptr != NULL) | |
2741 | set_bit(i, &p->inuse); | |
2742 | else | |
2743 | clear_bit(i, &p->inuse); | |
d4274b51 PI |
2744 | return 0; |
2745 | enomem: | |
2746 | return -ENOMEM; | |
1da177e4 LT |
2747 | } |
2748 | ||
2749 | static unsigned int cardmap_find_first_free(struct cardmap *map) | |
2750 | { | |
2751 | struct cardmap *p; | |
2752 | unsigned int nr = 0; | |
2753 | int i; | |
2754 | ||
2755 | if ((p = map) == NULL) | |
2756 | return 0; | |
2757 | for (;;) { | |
2758 | i = find_first_zero_bit(&p->inuse, CARDMAP_WIDTH); | |
2759 | if (i >= CARDMAP_WIDTH) { | |
2760 | if (p->parent == NULL) | |
2761 | return CARDMAP_WIDTH << p->shift; | |
2762 | p = p->parent; | |
2763 | i = (nr >> p->shift) & CARDMAP_MASK; | |
2764 | set_bit(i, &p->inuse); | |
2765 | continue; | |
2766 | } | |
2767 | nr = (nr & (~CARDMAP_MASK << p->shift)) | (i << p->shift); | |
2768 | if (p->shift == 0 || p->ptr[i] == NULL) | |
2769 | return nr; | |
2770 | p = p->ptr[i]; | |
2771 | } | |
2772 | } | |
2773 | ||
2774 | static void cardmap_destroy(struct cardmap **pmap) | |
2775 | { | |
2776 | struct cardmap *p, *np; | |
2777 | int i; | |
2778 | ||
2779 | for (p = *pmap; p != NULL; p = np) { | |
2780 | if (p->shift != 0) { | |
2781 | for (i = 0; i < CARDMAP_WIDTH; ++i) | |
2782 | if (p->ptr[i] != NULL) | |
2783 | break; | |
2784 | if (i < CARDMAP_WIDTH) { | |
2785 | np = p->ptr[i]; | |
2786 | p->ptr[i] = NULL; | |
2787 | continue; | |
2788 | } | |
2789 | } | |
2790 | np = p->parent; | |
2791 | kfree(p); | |
2792 | } | |
2793 | *pmap = NULL; | |
2794 | } | |
2795 | ||
2796 | /* Module/initialization stuff */ | |
2797 | ||
2798 | module_init(ppp_init); | |
2799 | module_exit(ppp_cleanup); | |
2800 | ||
2801 | EXPORT_SYMBOL(ppp_register_channel); | |
2802 | EXPORT_SYMBOL(ppp_unregister_channel); | |
2803 | EXPORT_SYMBOL(ppp_channel_index); | |
2804 | EXPORT_SYMBOL(ppp_unit_number); | |
2805 | EXPORT_SYMBOL(ppp_input); | |
2806 | EXPORT_SYMBOL(ppp_input_error); | |
2807 | EXPORT_SYMBOL(ppp_output_wakeup); | |
2808 | EXPORT_SYMBOL(ppp_register_compressor); | |
2809 | EXPORT_SYMBOL(ppp_unregister_compressor); | |
2810 | MODULE_LICENSE("GPL"); | |
2811 | MODULE_ALIAS_CHARDEV_MAJOR(PPP_MAJOR); | |
2812 | MODULE_ALIAS("/dev/ppp"); |