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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> | |
7a95d267 | 30 | #include <linux/idr.h> |
1da177e4 LT |
31 | #include <linux/netdevice.h> |
32 | #include <linux/poll.h> | |
33 | #include <linux/ppp_defs.h> | |
34 | #include <linux/filter.h> | |
35 | #include <linux/if_ppp.h> | |
36 | #include <linux/ppp_channel.h> | |
37 | #include <linux/ppp-comp.h> | |
38 | #include <linux/skbuff.h> | |
39 | #include <linux/rtnetlink.h> | |
40 | #include <linux/if_arp.h> | |
41 | #include <linux/ip.h> | |
42 | #include <linux/tcp.h> | |
43 | #include <linux/spinlock.h> | |
1da177e4 LT |
44 | #include <linux/rwsem.h> |
45 | #include <linux/stddef.h> | |
46 | #include <linux/device.h> | |
8ed965d6 | 47 | #include <linux/mutex.h> |
5a0e3ad6 | 48 | #include <linux/slab.h> |
1da177e4 LT |
49 | #include <net/slhc_vj.h> |
50 | #include <asm/atomic.h> | |
51 | ||
273ec51d CG |
52 | #include <linux/nsproxy.h> |
53 | #include <net/net_namespace.h> | |
54 | #include <net/netns/generic.h> | |
55 | ||
1da177e4 LT |
56 | #define PPP_VERSION "2.4.2" |
57 | ||
58 | /* | |
59 | * Network protocols we support. | |
60 | */ | |
61 | #define NP_IP 0 /* Internet Protocol V4 */ | |
62 | #define NP_IPV6 1 /* Internet Protocol V6 */ | |
63 | #define NP_IPX 2 /* IPX protocol */ | |
64 | #define NP_AT 3 /* Appletalk protocol */ | |
65 | #define NP_MPLS_UC 4 /* MPLS unicast */ | |
66 | #define NP_MPLS_MC 5 /* MPLS multicast */ | |
67 | #define NUM_NP 6 /* Number of NPs. */ | |
68 | ||
69 | #define MPHDRLEN 6 /* multilink protocol header length */ | |
70 | #define MPHDRLEN_SSN 4 /* ditto with short sequence numbers */ | |
1da177e4 LT |
71 | |
72 | /* | |
73 | * An instance of /dev/ppp can be associated with either a ppp | |
74 | * interface unit or a ppp channel. In both cases, file->private_data | |
75 | * points to one of these. | |
76 | */ | |
77 | struct ppp_file { | |
78 | enum { | |
79 | INTERFACE=1, CHANNEL | |
80 | } kind; | |
81 | struct sk_buff_head xq; /* pppd transmit queue */ | |
82 | struct sk_buff_head rq; /* receive queue for pppd */ | |
83 | wait_queue_head_t rwait; /* for poll on reading /dev/ppp */ | |
84 | atomic_t refcnt; /* # refs (incl /dev/ppp attached) */ | |
85 | int hdrlen; /* space to leave for headers */ | |
86 | int index; /* interface unit / channel number */ | |
87 | int dead; /* unit/channel has been shut down */ | |
88 | }; | |
89 | ||
b385a144 | 90 | #define PF_TO_X(pf, X) container_of(pf, X, file) |
1da177e4 LT |
91 | |
92 | #define PF_TO_PPP(pf) PF_TO_X(pf, struct ppp) | |
93 | #define PF_TO_CHANNEL(pf) PF_TO_X(pf, struct channel) | |
94 | ||
1da177e4 LT |
95 | /* |
96 | * Data structure describing one ppp unit. | |
97 | * A ppp unit corresponds to a ppp network interface device | |
98 | * and represents a multilink bundle. | |
99 | * It can have 0 or more ppp channels connected to it. | |
100 | */ | |
101 | struct ppp { | |
102 | struct ppp_file file; /* stuff for read/write/poll 0 */ | |
103 | struct file *owner; /* file that owns this unit 48 */ | |
104 | struct list_head channels; /* list of attached channels 4c */ | |
105 | int n_channels; /* how many channels are attached 54 */ | |
106 | spinlock_t rlock; /* lock for receive side 58 */ | |
107 | spinlock_t wlock; /* lock for transmit side 5c */ | |
108 | int mru; /* max receive unit 60 */ | |
109 | unsigned int flags; /* control bits 64 */ | |
110 | unsigned int xstate; /* transmit state bits 68 */ | |
111 | unsigned int rstate; /* receive state bits 6c */ | |
112 | int debug; /* debug flags 70 */ | |
113 | struct slcompress *vj; /* state for VJ header compression */ | |
114 | enum NPmode npmode[NUM_NP]; /* what to do with each net proto 78 */ | |
115 | struct sk_buff *xmit_pending; /* a packet ready to go out 88 */ | |
116 | struct compressor *xcomp; /* transmit packet compressor 8c */ | |
117 | void *xc_state; /* its internal state 90 */ | |
118 | struct compressor *rcomp; /* receive decompressor 94 */ | |
119 | void *rc_state; /* its internal state 98 */ | |
120 | unsigned long last_xmit; /* jiffies when last pkt sent 9c */ | |
121 | unsigned long last_recv; /* jiffies when last pkt rcvd a0 */ | |
122 | struct net_device *dev; /* network interface device a4 */ | |
739840d5 | 123 | int closing; /* is device closing down? a8 */ |
1da177e4 LT |
124 | #ifdef CONFIG_PPP_MULTILINK |
125 | int nxchan; /* next channel to send something on */ | |
126 | u32 nxseq; /* next sequence number to send */ | |
127 | int mrru; /* MP: max reconst. receive unit */ | |
128 | u32 nextseq; /* MP: seq no of next packet */ | |
129 | u32 minseq; /* MP: min of most recent seqnos */ | |
130 | struct sk_buff_head mrq; /* MP: receive reconstruction queue */ | |
131 | #endif /* CONFIG_PPP_MULTILINK */ | |
1da177e4 LT |
132 | #ifdef CONFIG_PPP_FILTER |
133 | struct sock_filter *pass_filter; /* filter for packets to pass */ | |
134 | struct sock_filter *active_filter;/* filter for pkts to reset idle */ | |
135 | unsigned pass_len, active_len; | |
136 | #endif /* CONFIG_PPP_FILTER */ | |
273ec51d | 137 | struct net *ppp_net; /* the net we belong to */ |
1da177e4 LT |
138 | }; |
139 | ||
140 | /* | |
141 | * Bits in flags: SC_NO_TCP_CCID, SC_CCP_OPEN, SC_CCP_UP, SC_LOOP_TRAFFIC, | |
b3f9b92a MD |
142 | * SC_MULTILINK, SC_MP_SHORTSEQ, SC_MP_XSHORTSEQ, SC_COMP_TCP, SC_REJ_COMP_TCP, |
143 | * SC_MUST_COMP | |
1da177e4 LT |
144 | * Bits in rstate: SC_DECOMP_RUN, SC_DC_ERROR, SC_DC_FERROR. |
145 | * Bits in xstate: SC_COMP_RUN | |
146 | */ | |
147 | #define SC_FLAG_BITS (SC_NO_TCP_CCID|SC_CCP_OPEN|SC_CCP_UP|SC_LOOP_TRAFFIC \ | |
148 | |SC_MULTILINK|SC_MP_SHORTSEQ|SC_MP_XSHORTSEQ \ | |
b3f9b92a | 149 | |SC_COMP_TCP|SC_REJ_COMP_TCP|SC_MUST_COMP) |
1da177e4 LT |
150 | |
151 | /* | |
152 | * Private data structure for each channel. | |
153 | * This includes the data structure used for multilink. | |
154 | */ | |
155 | struct channel { | |
156 | struct ppp_file file; /* stuff for read/write/poll */ | |
157 | struct list_head list; /* link in all/new_channels list */ | |
158 | struct ppp_channel *chan; /* public channel data structure */ | |
159 | struct rw_semaphore chan_sem; /* protects `chan' during chan ioctl */ | |
160 | spinlock_t downl; /* protects `chan', file.xq dequeue */ | |
161 | struct ppp *ppp; /* ppp unit we're connected to */ | |
273ec51d | 162 | struct net *chan_net; /* the net channel belongs to */ |
1da177e4 LT |
163 | struct list_head clist; /* link in list of channels per unit */ |
164 | rwlock_t upl; /* protects `ppp' */ | |
165 | #ifdef CONFIG_PPP_MULTILINK | |
166 | u8 avail; /* flag used in multilink stuff */ | |
167 | u8 had_frag; /* >= 1 fragments have been sent */ | |
168 | u32 lastseq; /* MP: last sequence # received */ | |
fa44a73c | 169 | int speed; /* speed of the corresponding ppp channel*/ |
1da177e4 LT |
170 | #endif /* CONFIG_PPP_MULTILINK */ |
171 | }; | |
172 | ||
173 | /* | |
174 | * SMP locking issues: | |
175 | * Both the ppp.rlock and ppp.wlock locks protect the ppp.channels | |
176 | * list and the ppp.n_channels field, you need to take both locks | |
177 | * before you modify them. | |
178 | * The lock ordering is: channel.upl -> ppp.wlock -> ppp.rlock -> | |
179 | * channel.downl. | |
180 | */ | |
181 | ||
15fd0cd9 | 182 | static DEFINE_MUTEX(ppp_mutex); |
1da177e4 | 183 | static atomic_t ppp_unit_count = ATOMIC_INIT(0); |
1da177e4 LT |
184 | static atomic_t channel_count = ATOMIC_INIT(0); |
185 | ||
273ec51d | 186 | /* per-net private data for this module */ |
f99189b1 | 187 | static int ppp_net_id __read_mostly; |
273ec51d CG |
188 | struct ppp_net { |
189 | /* units to ppp mapping */ | |
190 | struct idr units_idr; | |
191 | ||
192 | /* | |
193 | * all_ppp_mutex protects the units_idr mapping. | |
194 | * It also ensures that finding a ppp unit in the units_idr | |
195 | * map and updating its file.refcnt field is atomic. | |
196 | */ | |
197 | struct mutex all_ppp_mutex; | |
198 | ||
199 | /* channels */ | |
200 | struct list_head all_channels; | |
201 | struct list_head new_channels; | |
202 | int last_channel_index; | |
203 | ||
204 | /* | |
205 | * all_channels_lock protects all_channels and | |
206 | * last_channel_index, and the atomicity of find | |
207 | * a channel and updating its file.refcnt field. | |
208 | */ | |
209 | spinlock_t all_channels_lock; | |
210 | }; | |
211 | ||
1da177e4 LT |
212 | /* Get the PPP protocol number from a skb */ |
213 | #define PPP_PROTO(skb) (((skb)->data[0] << 8) + (skb)->data[1]) | |
214 | ||
215 | /* We limit the length of ppp->file.rq to this (arbitrary) value */ | |
216 | #define PPP_MAX_RQLEN 32 | |
217 | ||
218 | /* | |
219 | * Maximum number of multilink fragments queued up. | |
220 | * This has to be large enough to cope with the maximum latency of | |
221 | * the slowest channel relative to the others. Strictly it should | |
222 | * depend on the number of channels and their characteristics. | |
223 | */ | |
224 | #define PPP_MP_MAX_QLEN 128 | |
225 | ||
226 | /* Multilink header bits. */ | |
227 | #define B 0x80 /* this fragment begins a packet */ | |
228 | #define E 0x40 /* this fragment ends a packet */ | |
229 | ||
230 | /* Compare multilink sequence numbers (assumed to be 32 bits wide) */ | |
231 | #define seq_before(a, b) ((s32)((a) - (b)) < 0) | |
232 | #define seq_after(a, b) ((s32)((a) - (b)) > 0) | |
233 | ||
234 | /* Prototypes. */ | |
273ec51d CG |
235 | static int ppp_unattached_ioctl(struct net *net, struct ppp_file *pf, |
236 | struct file *file, unsigned int cmd, unsigned long arg); | |
1da177e4 LT |
237 | static void ppp_xmit_process(struct ppp *ppp); |
238 | static void ppp_send_frame(struct ppp *ppp, struct sk_buff *skb); | |
239 | static void ppp_push(struct ppp *ppp); | |
240 | static void ppp_channel_push(struct channel *pch); | |
241 | static void ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, | |
242 | struct channel *pch); | |
243 | static void ppp_receive_error(struct ppp *ppp); | |
244 | static void ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb); | |
245 | static struct sk_buff *ppp_decompress_frame(struct ppp *ppp, | |
246 | struct sk_buff *skb); | |
247 | #ifdef CONFIG_PPP_MULTILINK | |
248 | static void ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, | |
249 | struct channel *pch); | |
250 | static void ppp_mp_insert(struct ppp *ppp, struct sk_buff *skb); | |
251 | static struct sk_buff *ppp_mp_reconstruct(struct ppp *ppp); | |
252 | static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb); | |
253 | #endif /* CONFIG_PPP_MULTILINK */ | |
254 | static int ppp_set_compress(struct ppp *ppp, unsigned long arg); | |
255 | static void ppp_ccp_peek(struct ppp *ppp, struct sk_buff *skb, int inbound); | |
256 | static void ppp_ccp_closed(struct ppp *ppp); | |
257 | static struct compressor *find_compressor(int type); | |
258 | static void ppp_get_stats(struct ppp *ppp, struct ppp_stats *st); | |
273ec51d | 259 | static struct ppp *ppp_create_interface(struct net *net, int unit, int *retp); |
1da177e4 LT |
260 | static void init_ppp_file(struct ppp_file *pf, int kind); |
261 | static void ppp_shutdown_interface(struct ppp *ppp); | |
262 | static void ppp_destroy_interface(struct ppp *ppp); | |
273ec51d CG |
263 | static struct ppp *ppp_find_unit(struct ppp_net *pn, int unit); |
264 | static struct channel *ppp_find_channel(struct ppp_net *pn, int unit); | |
1da177e4 LT |
265 | static int ppp_connect_channel(struct channel *pch, int unit); |
266 | static int ppp_disconnect_channel(struct channel *pch); | |
267 | static void ppp_destroy_channel(struct channel *pch); | |
7a95d267 | 268 | static int unit_get(struct idr *p, void *ptr); |
85997576 | 269 | static int unit_set(struct idr *p, void *ptr, int n); |
7a95d267 CG |
270 | static void unit_put(struct idr *p, int n); |
271 | static void *unit_find(struct idr *p, int n); | |
1da177e4 | 272 | |
56b22935 | 273 | static struct class *ppp_class; |
1da177e4 | 274 | |
273ec51d CG |
275 | /* per net-namespace data */ |
276 | static inline struct ppp_net *ppp_pernet(struct net *net) | |
277 | { | |
278 | BUG_ON(!net); | |
279 | ||
280 | return net_generic(net, ppp_net_id); | |
281 | } | |
282 | ||
1da177e4 LT |
283 | /* Translates a PPP protocol number to a NP index (NP == network protocol) */ |
284 | static inline int proto_to_npindex(int proto) | |
285 | { | |
286 | switch (proto) { | |
287 | case PPP_IP: | |
288 | return NP_IP; | |
289 | case PPP_IPV6: | |
290 | return NP_IPV6; | |
291 | case PPP_IPX: | |
292 | return NP_IPX; | |
293 | case PPP_AT: | |
294 | return NP_AT; | |
295 | case PPP_MPLS_UC: | |
296 | return NP_MPLS_UC; | |
297 | case PPP_MPLS_MC: | |
298 | return NP_MPLS_MC; | |
299 | } | |
300 | return -EINVAL; | |
301 | } | |
302 | ||
303 | /* Translates an NP index into a PPP protocol number */ | |
304 | static const int npindex_to_proto[NUM_NP] = { | |
305 | PPP_IP, | |
306 | PPP_IPV6, | |
307 | PPP_IPX, | |
308 | PPP_AT, | |
309 | PPP_MPLS_UC, | |
310 | PPP_MPLS_MC, | |
311 | }; | |
6aa20a22 | 312 | |
1da177e4 LT |
313 | /* Translates an ethertype into an NP index */ |
314 | static inline int ethertype_to_npindex(int ethertype) | |
315 | { | |
316 | switch (ethertype) { | |
317 | case ETH_P_IP: | |
318 | return NP_IP; | |
319 | case ETH_P_IPV6: | |
320 | return NP_IPV6; | |
321 | case ETH_P_IPX: | |
322 | return NP_IPX; | |
323 | case ETH_P_PPPTALK: | |
324 | case ETH_P_ATALK: | |
325 | return NP_AT; | |
326 | case ETH_P_MPLS_UC: | |
327 | return NP_MPLS_UC; | |
328 | case ETH_P_MPLS_MC: | |
329 | return NP_MPLS_MC; | |
330 | } | |
331 | return -1; | |
332 | } | |
333 | ||
334 | /* Translates an NP index into an ethertype */ | |
335 | static const int npindex_to_ethertype[NUM_NP] = { | |
336 | ETH_P_IP, | |
337 | ETH_P_IPV6, | |
338 | ETH_P_IPX, | |
339 | ETH_P_PPPTALK, | |
340 | ETH_P_MPLS_UC, | |
341 | ETH_P_MPLS_MC, | |
342 | }; | |
343 | ||
344 | /* | |
345 | * Locking shorthand. | |
346 | */ | |
347 | #define ppp_xmit_lock(ppp) spin_lock_bh(&(ppp)->wlock) | |
348 | #define ppp_xmit_unlock(ppp) spin_unlock_bh(&(ppp)->wlock) | |
349 | #define ppp_recv_lock(ppp) spin_lock_bh(&(ppp)->rlock) | |
350 | #define ppp_recv_unlock(ppp) spin_unlock_bh(&(ppp)->rlock) | |
351 | #define ppp_lock(ppp) do { ppp_xmit_lock(ppp); \ | |
352 | ppp_recv_lock(ppp); } while (0) | |
353 | #define ppp_unlock(ppp) do { ppp_recv_unlock(ppp); \ | |
354 | ppp_xmit_unlock(ppp); } while (0) | |
355 | ||
356 | /* | |
357 | * /dev/ppp device routines. | |
358 | * The /dev/ppp device is used by pppd to control the ppp unit. | |
359 | * It supports the read, write, ioctl and poll functions. | |
360 | * Open instances of /dev/ppp can be in one of three states: | |
361 | * unattached, attached to a ppp unit, or attached to a ppp channel. | |
362 | */ | |
363 | static int ppp_open(struct inode *inode, struct file *file) | |
364 | { | |
365 | /* | |
366 | * This could (should?) be enforced by the permissions on /dev/ppp. | |
367 | */ | |
368 | if (!capable(CAP_NET_ADMIN)) | |
369 | return -EPERM; | |
370 | return 0; | |
371 | } | |
372 | ||
f3ff8a4d | 373 | static int ppp_release(struct inode *unused, struct file *file) |
1da177e4 LT |
374 | { |
375 | struct ppp_file *pf = file->private_data; | |
376 | struct ppp *ppp; | |
377 | ||
cd228d54 | 378 | if (pf) { |
1da177e4 LT |
379 | file->private_data = NULL; |
380 | if (pf->kind == INTERFACE) { | |
381 | ppp = PF_TO_PPP(pf); | |
382 | if (file == ppp->owner) | |
383 | ppp_shutdown_interface(ppp); | |
384 | } | |
385 | if (atomic_dec_and_test(&pf->refcnt)) { | |
386 | switch (pf->kind) { | |
387 | case INTERFACE: | |
388 | ppp_destroy_interface(PF_TO_PPP(pf)); | |
389 | break; | |
390 | case CHANNEL: | |
391 | ppp_destroy_channel(PF_TO_CHANNEL(pf)); | |
392 | break; | |
393 | } | |
394 | } | |
395 | } | |
396 | return 0; | |
397 | } | |
398 | ||
399 | static ssize_t ppp_read(struct file *file, char __user *buf, | |
400 | size_t count, loff_t *ppos) | |
401 | { | |
402 | struct ppp_file *pf = file->private_data; | |
403 | DECLARE_WAITQUEUE(wait, current); | |
404 | ssize_t ret; | |
405 | struct sk_buff *skb = NULL; | |
19937d04 | 406 | struct iovec iov; |
1da177e4 LT |
407 | |
408 | ret = count; | |
409 | ||
cd228d54 | 410 | if (!pf) |
1da177e4 LT |
411 | return -ENXIO; |
412 | add_wait_queue(&pf->rwait, &wait); | |
413 | for (;;) { | |
414 | set_current_state(TASK_INTERRUPTIBLE); | |
415 | skb = skb_dequeue(&pf->rq); | |
416 | if (skb) | |
417 | break; | |
418 | ret = 0; | |
419 | if (pf->dead) | |
420 | break; | |
421 | if (pf->kind == INTERFACE) { | |
422 | /* | |
423 | * Return 0 (EOF) on an interface that has no | |
424 | * channels connected, unless it is looping | |
425 | * network traffic (demand mode). | |
426 | */ | |
427 | struct ppp *ppp = PF_TO_PPP(pf); | |
8e95a202 JP |
428 | if (ppp->n_channels == 0 && |
429 | (ppp->flags & SC_LOOP_TRAFFIC) == 0) | |
1da177e4 LT |
430 | break; |
431 | } | |
432 | ret = -EAGAIN; | |
433 | if (file->f_flags & O_NONBLOCK) | |
434 | break; | |
435 | ret = -ERESTARTSYS; | |
436 | if (signal_pending(current)) | |
437 | break; | |
438 | schedule(); | |
439 | } | |
440 | set_current_state(TASK_RUNNING); | |
441 | remove_wait_queue(&pf->rwait, &wait); | |
442 | ||
cd228d54 | 443 | if (!skb) |
1da177e4 LT |
444 | goto out; |
445 | ||
446 | ret = -EOVERFLOW; | |
447 | if (skb->len > count) | |
448 | goto outf; | |
449 | ret = -EFAULT; | |
19937d04 SA |
450 | iov.iov_base = buf; |
451 | iov.iov_len = count; | |
452 | if (skb_copy_datagram_iovec(skb, 0, &iov, skb->len)) | |
1da177e4 LT |
453 | goto outf; |
454 | ret = skb->len; | |
455 | ||
456 | outf: | |
457 | kfree_skb(skb); | |
458 | out: | |
459 | return ret; | |
460 | } | |
461 | ||
462 | static ssize_t ppp_write(struct file *file, const char __user *buf, | |
463 | size_t count, loff_t *ppos) | |
464 | { | |
465 | struct ppp_file *pf = file->private_data; | |
466 | struct sk_buff *skb; | |
467 | ssize_t ret; | |
468 | ||
cd228d54 | 469 | if (!pf) |
1da177e4 LT |
470 | return -ENXIO; |
471 | ret = -ENOMEM; | |
472 | skb = alloc_skb(count + pf->hdrlen, GFP_KERNEL); | |
cd228d54 | 473 | if (!skb) |
1da177e4 LT |
474 | goto out; |
475 | skb_reserve(skb, pf->hdrlen); | |
476 | ret = -EFAULT; | |
477 | if (copy_from_user(skb_put(skb, count), buf, count)) { | |
478 | kfree_skb(skb); | |
479 | goto out; | |
480 | } | |
481 | ||
482 | skb_queue_tail(&pf->xq, skb); | |
483 | ||
484 | switch (pf->kind) { | |
485 | case INTERFACE: | |
486 | ppp_xmit_process(PF_TO_PPP(pf)); | |
487 | break; | |
488 | case CHANNEL: | |
489 | ppp_channel_push(PF_TO_CHANNEL(pf)); | |
490 | break; | |
491 | } | |
492 | ||
493 | ret = count; | |
494 | ||
495 | out: | |
496 | return ret; | |
497 | } | |
498 | ||
499 | /* No kernel lock - fine */ | |
500 | static unsigned int ppp_poll(struct file *file, poll_table *wait) | |
501 | { | |
502 | struct ppp_file *pf = file->private_data; | |
503 | unsigned int mask; | |
504 | ||
cd228d54 | 505 | if (!pf) |
1da177e4 LT |
506 | return 0; |
507 | poll_wait(file, &pf->rwait, wait); | |
508 | mask = POLLOUT | POLLWRNORM; | |
cd228d54 | 509 | if (skb_peek(&pf->rq)) |
1da177e4 LT |
510 | mask |= POLLIN | POLLRDNORM; |
511 | if (pf->dead) | |
512 | mask |= POLLHUP; | |
513 | else if (pf->kind == INTERFACE) { | |
514 | /* see comment in ppp_read */ | |
515 | struct ppp *ppp = PF_TO_PPP(pf); | |
8e95a202 JP |
516 | if (ppp->n_channels == 0 && |
517 | (ppp->flags & SC_LOOP_TRAFFIC) == 0) | |
1da177e4 LT |
518 | mask |= POLLIN | POLLRDNORM; |
519 | } | |
520 | ||
521 | return mask; | |
522 | } | |
523 | ||
524 | #ifdef CONFIG_PPP_FILTER | |
525 | static int get_filter(void __user *arg, struct sock_filter **p) | |
526 | { | |
527 | struct sock_fprog uprog; | |
528 | struct sock_filter *code = NULL; | |
529 | int len, err; | |
530 | ||
531 | if (copy_from_user(&uprog, arg, sizeof(uprog))) | |
532 | return -EFAULT; | |
533 | ||
1da177e4 LT |
534 | if (!uprog.len) { |
535 | *p = NULL; | |
536 | return 0; | |
537 | } | |
538 | ||
539 | len = uprog.len * sizeof(struct sock_filter); | |
b23d00e9 JL |
540 | code = memdup_user(uprog.filter, len); |
541 | if (IS_ERR(code)) | |
542 | return PTR_ERR(code); | |
1da177e4 LT |
543 | |
544 | err = sk_chk_filter(code, uprog.len); | |
545 | if (err) { | |
546 | kfree(code); | |
547 | return err; | |
548 | } | |
549 | ||
550 | *p = code; | |
551 | return uprog.len; | |
552 | } | |
553 | #endif /* CONFIG_PPP_FILTER */ | |
554 | ||
f3ff8a4d | 555 | static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
556 | { |
557 | struct ppp_file *pf = file->private_data; | |
558 | struct ppp *ppp; | |
559 | int err = -EFAULT, val, val2, i; | |
560 | struct ppp_idle idle; | |
561 | struct npioctl npi; | |
562 | int unit, cflags; | |
563 | struct slcompress *vj; | |
564 | void __user *argp = (void __user *)arg; | |
565 | int __user *p = argp; | |
566 | ||
cd228d54 | 567 | if (!pf) |
273ec51d CG |
568 | return ppp_unattached_ioctl(current->nsproxy->net_ns, |
569 | pf, file, cmd, arg); | |
1da177e4 LT |
570 | |
571 | if (cmd == PPPIOCDETACH) { | |
572 | /* | |
573 | * We have to be careful here... if the file descriptor | |
574 | * has been dup'd, we could have another process in the | |
575 | * middle of a poll using the same file *, so we had | |
576 | * better not free the interface data structures - | |
577 | * instead we fail the ioctl. Even in this case, we | |
578 | * shut down the interface if we are the owner of it. | |
579 | * Actually, we should get rid of PPPIOCDETACH, userland | |
580 | * (i.e. pppd) could achieve the same effect by closing | |
581 | * this fd and reopening /dev/ppp. | |
582 | */ | |
583 | err = -EINVAL; | |
15fd0cd9 | 584 | mutex_lock(&ppp_mutex); |
1da177e4 LT |
585 | if (pf->kind == INTERFACE) { |
586 | ppp = PF_TO_PPP(pf); | |
587 | if (file == ppp->owner) | |
588 | ppp_shutdown_interface(ppp); | |
589 | } | |
516e0cc5 | 590 | if (atomic_long_read(&file->f_count) <= 2) { |
f3ff8a4d | 591 | ppp_release(NULL, file); |
1da177e4 LT |
592 | err = 0; |
593 | } else | |
516e0cc5 AV |
594 | printk(KERN_DEBUG "PPPIOCDETACH file->f_count=%ld\n", |
595 | atomic_long_read(&file->f_count)); | |
15fd0cd9 | 596 | mutex_unlock(&ppp_mutex); |
1da177e4 LT |
597 | return err; |
598 | } | |
599 | ||
600 | if (pf->kind == CHANNEL) { | |
f3ff8a4d | 601 | struct channel *pch; |
1da177e4 LT |
602 | struct ppp_channel *chan; |
603 | ||
15fd0cd9 | 604 | mutex_lock(&ppp_mutex); |
f3ff8a4d AC |
605 | pch = PF_TO_CHANNEL(pf); |
606 | ||
1da177e4 LT |
607 | switch (cmd) { |
608 | case PPPIOCCONNECT: | |
609 | if (get_user(unit, p)) | |
610 | break; | |
611 | err = ppp_connect_channel(pch, unit); | |
612 | break; | |
613 | ||
614 | case PPPIOCDISCONN: | |
615 | err = ppp_disconnect_channel(pch); | |
616 | break; | |
617 | ||
618 | default: | |
619 | down_read(&pch->chan_sem); | |
620 | chan = pch->chan; | |
621 | err = -ENOTTY; | |
622 | if (chan && chan->ops->ioctl) | |
623 | err = chan->ops->ioctl(chan, cmd, arg); | |
624 | up_read(&pch->chan_sem); | |
625 | } | |
15fd0cd9 | 626 | mutex_unlock(&ppp_mutex); |
1da177e4 LT |
627 | return err; |
628 | } | |
629 | ||
630 | if (pf->kind != INTERFACE) { | |
631 | /* can't happen */ | |
632 | printk(KERN_ERR "PPP: not interface or channel??\n"); | |
633 | return -EINVAL; | |
634 | } | |
635 | ||
15fd0cd9 | 636 | mutex_lock(&ppp_mutex); |
1da177e4 LT |
637 | ppp = PF_TO_PPP(pf); |
638 | switch (cmd) { | |
639 | case PPPIOCSMRU: | |
640 | if (get_user(val, p)) | |
641 | break; | |
642 | ppp->mru = val; | |
643 | err = 0; | |
644 | break; | |
645 | ||
646 | case PPPIOCSFLAGS: | |
647 | if (get_user(val, p)) | |
648 | break; | |
649 | ppp_lock(ppp); | |
650 | cflags = ppp->flags & ~val; | |
651 | ppp->flags = val & SC_FLAG_BITS; | |
652 | ppp_unlock(ppp); | |
653 | if (cflags & SC_CCP_OPEN) | |
654 | ppp_ccp_closed(ppp); | |
655 | err = 0; | |
656 | break; | |
657 | ||
658 | case PPPIOCGFLAGS: | |
659 | val = ppp->flags | ppp->xstate | ppp->rstate; | |
660 | if (put_user(val, p)) | |
661 | break; | |
662 | err = 0; | |
663 | break; | |
664 | ||
665 | case PPPIOCSCOMPRESS: | |
666 | err = ppp_set_compress(ppp, arg); | |
667 | break; | |
668 | ||
669 | case PPPIOCGUNIT: | |
670 | if (put_user(ppp->file.index, p)) | |
671 | break; | |
672 | err = 0; | |
673 | break; | |
674 | ||
675 | case PPPIOCSDEBUG: | |
676 | if (get_user(val, p)) | |
677 | break; | |
678 | ppp->debug = val; | |
679 | err = 0; | |
680 | break; | |
681 | ||
682 | case PPPIOCGDEBUG: | |
683 | if (put_user(ppp->debug, p)) | |
684 | break; | |
685 | err = 0; | |
686 | break; | |
687 | ||
688 | case PPPIOCGIDLE: | |
689 | idle.xmit_idle = (jiffies - ppp->last_xmit) / HZ; | |
690 | idle.recv_idle = (jiffies - ppp->last_recv) / HZ; | |
691 | if (copy_to_user(argp, &idle, sizeof(idle))) | |
692 | break; | |
693 | err = 0; | |
694 | break; | |
695 | ||
696 | case PPPIOCSMAXCID: | |
697 | if (get_user(val, p)) | |
698 | break; | |
699 | val2 = 15; | |
700 | if ((val >> 16) != 0) { | |
701 | val2 = val >> 16; | |
702 | val &= 0xffff; | |
703 | } | |
704 | vj = slhc_init(val2+1, val+1); | |
cd228d54 | 705 | if (!vj) { |
1da177e4 LT |
706 | printk(KERN_ERR "PPP: no memory (VJ compressor)\n"); |
707 | err = -ENOMEM; | |
708 | break; | |
709 | } | |
710 | ppp_lock(ppp); | |
cd228d54 | 711 | if (ppp->vj) |
1da177e4 LT |
712 | slhc_free(ppp->vj); |
713 | ppp->vj = vj; | |
714 | ppp_unlock(ppp); | |
715 | err = 0; | |
716 | break; | |
717 | ||
718 | case PPPIOCGNPMODE: | |
719 | case PPPIOCSNPMODE: | |
720 | if (copy_from_user(&npi, argp, sizeof(npi))) | |
721 | break; | |
722 | err = proto_to_npindex(npi.protocol); | |
723 | if (err < 0) | |
724 | break; | |
725 | i = err; | |
726 | if (cmd == PPPIOCGNPMODE) { | |
727 | err = -EFAULT; | |
728 | npi.mode = ppp->npmode[i]; | |
729 | if (copy_to_user(argp, &npi, sizeof(npi))) | |
730 | break; | |
731 | } else { | |
732 | ppp->npmode[i] = npi.mode; | |
733 | /* we may be able to transmit more packets now (??) */ | |
734 | netif_wake_queue(ppp->dev); | |
735 | } | |
736 | err = 0; | |
737 | break; | |
738 | ||
739 | #ifdef CONFIG_PPP_FILTER | |
740 | case PPPIOCSPASS: | |
741 | { | |
742 | struct sock_filter *code; | |
743 | err = get_filter(argp, &code); | |
744 | if (err >= 0) { | |
745 | ppp_lock(ppp); | |
746 | kfree(ppp->pass_filter); | |
747 | ppp->pass_filter = code; | |
748 | ppp->pass_len = err; | |
749 | ppp_unlock(ppp); | |
750 | err = 0; | |
751 | } | |
752 | break; | |
753 | } | |
754 | case PPPIOCSACTIVE: | |
755 | { | |
756 | struct sock_filter *code; | |
757 | err = get_filter(argp, &code); | |
758 | if (err >= 0) { | |
759 | ppp_lock(ppp); | |
760 | kfree(ppp->active_filter); | |
761 | ppp->active_filter = code; | |
762 | ppp->active_len = err; | |
763 | ppp_unlock(ppp); | |
764 | err = 0; | |
765 | } | |
766 | break; | |
767 | } | |
768 | #endif /* CONFIG_PPP_FILTER */ | |
769 | ||
770 | #ifdef CONFIG_PPP_MULTILINK | |
771 | case PPPIOCSMRRU: | |
772 | if (get_user(val, p)) | |
773 | break; | |
774 | ppp_recv_lock(ppp); | |
775 | ppp->mrru = val; | |
776 | ppp_recv_unlock(ppp); | |
777 | err = 0; | |
778 | break; | |
779 | #endif /* CONFIG_PPP_MULTILINK */ | |
780 | ||
781 | default: | |
782 | err = -ENOTTY; | |
783 | } | |
15fd0cd9 | 784 | mutex_unlock(&ppp_mutex); |
1da177e4 LT |
785 | return err; |
786 | } | |
787 | ||
273ec51d CG |
788 | static int ppp_unattached_ioctl(struct net *net, struct ppp_file *pf, |
789 | struct file *file, unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
790 | { |
791 | int unit, err = -EFAULT; | |
792 | struct ppp *ppp; | |
793 | struct channel *chan; | |
273ec51d | 794 | struct ppp_net *pn; |
1da177e4 LT |
795 | int __user *p = (int __user *)arg; |
796 | ||
15fd0cd9 | 797 | mutex_lock(&ppp_mutex); |
1da177e4 LT |
798 | switch (cmd) { |
799 | case PPPIOCNEWUNIT: | |
800 | /* Create a new ppp unit */ | |
801 | if (get_user(unit, p)) | |
802 | break; | |
273ec51d | 803 | ppp = ppp_create_interface(net, unit, &err); |
cd228d54 | 804 | if (!ppp) |
1da177e4 LT |
805 | break; |
806 | file->private_data = &ppp->file; | |
807 | ppp->owner = file; | |
808 | err = -EFAULT; | |
809 | if (put_user(ppp->file.index, p)) | |
810 | break; | |
811 | err = 0; | |
812 | break; | |
813 | ||
814 | case PPPIOCATTACH: | |
815 | /* Attach to an existing ppp unit */ | |
816 | if (get_user(unit, p)) | |
817 | break; | |
1da177e4 | 818 | err = -ENXIO; |
273ec51d CG |
819 | pn = ppp_pernet(net); |
820 | mutex_lock(&pn->all_ppp_mutex); | |
821 | ppp = ppp_find_unit(pn, unit); | |
cd228d54 | 822 | if (ppp) { |
1da177e4 LT |
823 | atomic_inc(&ppp->file.refcnt); |
824 | file->private_data = &ppp->file; | |
825 | err = 0; | |
826 | } | |
273ec51d | 827 | mutex_unlock(&pn->all_ppp_mutex); |
1da177e4 LT |
828 | break; |
829 | ||
830 | case PPPIOCATTCHAN: | |
831 | if (get_user(unit, p)) | |
832 | break; | |
1da177e4 | 833 | err = -ENXIO; |
273ec51d CG |
834 | pn = ppp_pernet(net); |
835 | spin_lock_bh(&pn->all_channels_lock); | |
836 | chan = ppp_find_channel(pn, unit); | |
cd228d54 | 837 | if (chan) { |
1da177e4 LT |
838 | atomic_inc(&chan->file.refcnt); |
839 | file->private_data = &chan->file; | |
840 | err = 0; | |
841 | } | |
273ec51d | 842 | spin_unlock_bh(&pn->all_channels_lock); |
1da177e4 LT |
843 | break; |
844 | ||
845 | default: | |
846 | err = -ENOTTY; | |
847 | } | |
15fd0cd9 | 848 | mutex_unlock(&ppp_mutex); |
1da177e4 LT |
849 | return err; |
850 | } | |
851 | ||
d54b1fdb | 852 | static const struct file_operations ppp_device_fops = { |
1da177e4 LT |
853 | .owner = THIS_MODULE, |
854 | .read = ppp_read, | |
855 | .write = ppp_write, | |
856 | .poll = ppp_poll, | |
f3ff8a4d | 857 | .unlocked_ioctl = ppp_ioctl, |
1da177e4 | 858 | .open = ppp_open, |
6038f373 AB |
859 | .release = ppp_release, |
860 | .llseek = noop_llseek, | |
1da177e4 LT |
861 | }; |
862 | ||
273ec51d CG |
863 | static __net_init int ppp_init_net(struct net *net) |
864 | { | |
741a6fa2 | 865 | struct ppp_net *pn = net_generic(net, ppp_net_id); |
273ec51d CG |
866 | |
867 | idr_init(&pn->units_idr); | |
868 | mutex_init(&pn->all_ppp_mutex); | |
869 | ||
870 | INIT_LIST_HEAD(&pn->all_channels); | |
871 | INIT_LIST_HEAD(&pn->new_channels); | |
872 | ||
873 | spin_lock_init(&pn->all_channels_lock); | |
874 | ||
273ec51d CG |
875 | return 0; |
876 | } | |
877 | ||
878 | static __net_exit void ppp_exit_net(struct net *net) | |
879 | { | |
741a6fa2 | 880 | struct ppp_net *pn = net_generic(net, ppp_net_id); |
273ec51d | 881 | |
273ec51d | 882 | idr_destroy(&pn->units_idr); |
273ec51d CG |
883 | } |
884 | ||
0012985d | 885 | static struct pernet_operations ppp_net_ops = { |
273ec51d CG |
886 | .init = ppp_init_net, |
887 | .exit = ppp_exit_net, | |
741a6fa2 EB |
888 | .id = &ppp_net_id, |
889 | .size = sizeof(struct ppp_net), | |
273ec51d CG |
890 | }; |
891 | ||
1da177e4 LT |
892 | #define PPP_MAJOR 108 |
893 | ||
894 | /* Called at boot time if ppp is compiled into the kernel, | |
895 | or at module load time (from init_module) if compiled as a module. */ | |
896 | static int __init ppp_init(void) | |
897 | { | |
898 | int err; | |
899 | ||
900 | printk(KERN_INFO "PPP generic driver version " PPP_VERSION "\n"); | |
273ec51d | 901 | |
741a6fa2 | 902 | err = register_pernet_device(&ppp_net_ops); |
273ec51d CG |
903 | if (err) { |
904 | printk(KERN_ERR "failed to register PPP pernet device (%d)\n", err); | |
905 | goto out; | |
1da177e4 LT |
906 | } |
907 | ||
273ec51d CG |
908 | err = register_chrdev(PPP_MAJOR, "ppp", &ppp_device_fops); |
909 | if (err) { | |
1da177e4 | 910 | printk(KERN_ERR "failed to register PPP device (%d)\n", err); |
273ec51d CG |
911 | goto out_net; |
912 | } | |
913 | ||
914 | ppp_class = class_create(THIS_MODULE, "ppp"); | |
915 | if (IS_ERR(ppp_class)) { | |
916 | err = PTR_ERR(ppp_class); | |
917 | goto out_chrdev; | |
918 | } | |
919 | ||
920 | /* not a big deal if we fail here :-) */ | |
921 | device_create(ppp_class, NULL, MKDEV(PPP_MAJOR, 0), NULL, "ppp"); | |
922 | ||
923 | return 0; | |
1da177e4 | 924 | |
1da177e4 LT |
925 | out_chrdev: |
926 | unregister_chrdev(PPP_MAJOR, "ppp"); | |
273ec51d | 927 | out_net: |
741a6fa2 | 928 | unregister_pernet_device(&ppp_net_ops); |
273ec51d CG |
929 | out: |
930 | return err; | |
1da177e4 LT |
931 | } |
932 | ||
933 | /* | |
934 | * Network interface unit routines. | |
935 | */ | |
424efe9c | 936 | static netdev_tx_t |
1da177e4 LT |
937 | ppp_start_xmit(struct sk_buff *skb, struct net_device *dev) |
938 | { | |
c8019bf3 | 939 | struct ppp *ppp = netdev_priv(dev); |
1da177e4 LT |
940 | int npi, proto; |
941 | unsigned char *pp; | |
942 | ||
943 | npi = ethertype_to_npindex(ntohs(skb->protocol)); | |
944 | if (npi < 0) | |
945 | goto outf; | |
946 | ||
947 | /* Drop, accept or reject the packet */ | |
948 | switch (ppp->npmode[npi]) { | |
949 | case NPMODE_PASS: | |
950 | break; | |
951 | case NPMODE_QUEUE: | |
952 | /* it would be nice to have a way to tell the network | |
953 | system to queue this one up for later. */ | |
954 | goto outf; | |
955 | case NPMODE_DROP: | |
956 | case NPMODE_ERROR: | |
957 | goto outf; | |
958 | } | |
959 | ||
960 | /* Put the 2-byte PPP protocol number on the front, | |
961 | making sure there is room for the address and control fields. */ | |
7b797d5b HX |
962 | if (skb_cow_head(skb, PPP_HDRLEN)) |
963 | goto outf; | |
964 | ||
1da177e4 LT |
965 | pp = skb_push(skb, 2); |
966 | proto = npindex_to_proto[npi]; | |
967 | pp[0] = proto >> 8; | |
968 | pp[1] = proto; | |
969 | ||
970 | netif_stop_queue(dev); | |
971 | skb_queue_tail(&ppp->file.xq, skb); | |
972 | ppp_xmit_process(ppp); | |
6ed10654 | 973 | return NETDEV_TX_OK; |
1da177e4 LT |
974 | |
975 | outf: | |
976 | kfree_skb(skb); | |
6ceffd47 | 977 | ++dev->stats.tx_dropped; |
6ed10654 | 978 | return NETDEV_TX_OK; |
1da177e4 LT |
979 | } |
980 | ||
1da177e4 LT |
981 | static int |
982 | ppp_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
983 | { | |
c8019bf3 | 984 | struct ppp *ppp = netdev_priv(dev); |
1da177e4 LT |
985 | int err = -EFAULT; |
986 | void __user *addr = (void __user *) ifr->ifr_ifru.ifru_data; | |
987 | struct ppp_stats stats; | |
988 | struct ppp_comp_stats cstats; | |
989 | char *vers; | |
990 | ||
991 | switch (cmd) { | |
992 | case SIOCGPPPSTATS: | |
993 | ppp_get_stats(ppp, &stats); | |
994 | if (copy_to_user(addr, &stats, sizeof(stats))) | |
995 | break; | |
996 | err = 0; | |
997 | break; | |
998 | ||
999 | case SIOCGPPPCSTATS: | |
1000 | memset(&cstats, 0, sizeof(cstats)); | |
cd228d54 | 1001 | if (ppp->xc_state) |
1da177e4 | 1002 | ppp->xcomp->comp_stat(ppp->xc_state, &cstats.c); |
cd228d54 | 1003 | if (ppp->rc_state) |
1da177e4 LT |
1004 | ppp->rcomp->decomp_stat(ppp->rc_state, &cstats.d); |
1005 | if (copy_to_user(addr, &cstats, sizeof(cstats))) | |
1006 | break; | |
1007 | err = 0; | |
1008 | break; | |
1009 | ||
1010 | case SIOCGPPPVER: | |
1011 | vers = PPP_VERSION; | |
1012 | if (copy_to_user(addr, vers, strlen(vers) + 1)) | |
1013 | break; | |
1014 | err = 0; | |
1015 | break; | |
1016 | ||
1017 | default: | |
1018 | err = -EINVAL; | |
1019 | } | |
1020 | ||
1021 | return err; | |
1022 | } | |
1023 | ||
52256cfc | 1024 | static const struct net_device_ops ppp_netdev_ops = { |
00829823 SH |
1025 | .ndo_start_xmit = ppp_start_xmit, |
1026 | .ndo_do_ioctl = ppp_net_ioctl, | |
52256cfc SH |
1027 | }; |
1028 | ||
1da177e4 LT |
1029 | static void ppp_setup(struct net_device *dev) |
1030 | { | |
52256cfc | 1031 | dev->netdev_ops = &ppp_netdev_ops; |
1da177e4 LT |
1032 | dev->hard_header_len = PPP_HDRLEN; |
1033 | dev->mtu = PPP_MTU; | |
1034 | dev->addr_len = 0; | |
1035 | dev->tx_queue_len = 3; | |
1036 | dev->type = ARPHRD_PPP; | |
1037 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
273ec51d | 1038 | dev->features |= NETIF_F_NETNS_LOCAL; |
8b2d850d | 1039 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1040 | } |
1041 | ||
1042 | /* | |
1043 | * Transmit-side routines. | |
1044 | */ | |
1045 | ||
1046 | /* | |
1047 | * Called to do any work queued up on the transmit side | |
1048 | * that can now be done. | |
1049 | */ | |
1050 | static void | |
1051 | ppp_xmit_process(struct ppp *ppp) | |
1052 | { | |
1053 | struct sk_buff *skb; | |
1054 | ||
1055 | ppp_xmit_lock(ppp); | |
739840d5 | 1056 | if (!ppp->closing) { |
1da177e4 | 1057 | ppp_push(ppp); |
8e95a202 JP |
1058 | while (!ppp->xmit_pending && |
1059 | (skb = skb_dequeue(&ppp->file.xq))) | |
1da177e4 LT |
1060 | ppp_send_frame(ppp, skb); |
1061 | /* If there's no work left to do, tell the core net | |
1062 | code that we can accept some more. */ | |
cd228d54 | 1063 | if (!ppp->xmit_pending && !skb_peek(&ppp->file.xq)) |
1da177e4 LT |
1064 | netif_wake_queue(ppp->dev); |
1065 | } | |
1066 | ppp_xmit_unlock(ppp); | |
1067 | } | |
1068 | ||
b3f9b92a MD |
1069 | static inline struct sk_buff * |
1070 | pad_compress_skb(struct ppp *ppp, struct sk_buff *skb) | |
1071 | { | |
1072 | struct sk_buff *new_skb; | |
1073 | int len; | |
1074 | int new_skb_size = ppp->dev->mtu + | |
1075 | ppp->xcomp->comp_extra + ppp->dev->hard_header_len; | |
1076 | int compressor_skb_size = ppp->dev->mtu + | |
1077 | ppp->xcomp->comp_extra + PPP_HDRLEN; | |
1078 | new_skb = alloc_skb(new_skb_size, GFP_ATOMIC); | |
1079 | if (!new_skb) { | |
1080 | if (net_ratelimit()) | |
1081 | printk(KERN_ERR "PPP: no memory (comp pkt)\n"); | |
1082 | return NULL; | |
1083 | } | |
1084 | if (ppp->dev->hard_header_len > PPP_HDRLEN) | |
1085 | skb_reserve(new_skb, | |
1086 | ppp->dev->hard_header_len - PPP_HDRLEN); | |
1087 | ||
1088 | /* compressor still expects A/C bytes in hdr */ | |
1089 | len = ppp->xcomp->compress(ppp->xc_state, skb->data - 2, | |
1090 | new_skb->data, skb->len + 2, | |
1091 | compressor_skb_size); | |
1092 | if (len > 0 && (ppp->flags & SC_CCP_UP)) { | |
1093 | kfree_skb(skb); | |
1094 | skb = new_skb; | |
1095 | skb_put(skb, len); | |
1096 | skb_pull(skb, 2); /* pull off A/C bytes */ | |
1097 | } else if (len == 0) { | |
1098 | /* didn't compress, or CCP not up yet */ | |
1099 | kfree_skb(new_skb); | |
1100 | new_skb = skb; | |
1101 | } else { | |
1102 | /* | |
1103 | * (len < 0) | |
1104 | * MPPE requires that we do not send unencrypted | |
1105 | * frames. The compressor will return -1 if we | |
1106 | * should drop the frame. We cannot simply test | |
1107 | * the compress_proto because MPPE and MPPC share | |
1108 | * the same number. | |
1109 | */ | |
1110 | if (net_ratelimit()) | |
1111 | printk(KERN_ERR "ppp: compressor dropped pkt\n"); | |
1112 | kfree_skb(skb); | |
1113 | kfree_skb(new_skb); | |
1114 | new_skb = NULL; | |
1115 | } | |
1116 | return new_skb; | |
1117 | } | |
1118 | ||
1da177e4 LT |
1119 | /* |
1120 | * Compress and send a frame. | |
1121 | * The caller should have locked the xmit path, | |
1122 | * and xmit_pending should be 0. | |
1123 | */ | |
1124 | static void | |
1125 | ppp_send_frame(struct ppp *ppp, struct sk_buff *skb) | |
1126 | { | |
1127 | int proto = PPP_PROTO(skb); | |
1128 | struct sk_buff *new_skb; | |
1129 | int len; | |
1130 | unsigned char *cp; | |
1131 | ||
1132 | if (proto < 0x8000) { | |
1133 | #ifdef CONFIG_PPP_FILTER | |
1134 | /* check if we should pass this packet */ | |
1135 | /* the filter instructions are constructed assuming | |
1136 | a four-byte PPP header on each packet */ | |
1137 | *skb_push(skb, 2) = 1; | |
8e95a202 JP |
1138 | if (ppp->pass_filter && |
1139 | sk_run_filter(skb, ppp->pass_filter, | |
1140 | ppp->pass_len) == 0) { | |
1da177e4 LT |
1141 | if (ppp->debug & 1) |
1142 | printk(KERN_DEBUG "PPP: outbound frame not passed\n"); | |
1143 | kfree_skb(skb); | |
1144 | return; | |
1145 | } | |
1146 | /* if this packet passes the active filter, record the time */ | |
8e95a202 JP |
1147 | if (!(ppp->active_filter && |
1148 | sk_run_filter(skb, ppp->active_filter, | |
1149 | ppp->active_len) == 0)) | |
1da177e4 LT |
1150 | ppp->last_xmit = jiffies; |
1151 | skb_pull(skb, 2); | |
1152 | #else | |
1153 | /* for data packets, record the time */ | |
1154 | ppp->last_xmit = jiffies; | |
1155 | #endif /* CONFIG_PPP_FILTER */ | |
1156 | } | |
1157 | ||
8c0469cd PZ |
1158 | ++ppp->dev->stats.tx_packets; |
1159 | ppp->dev->stats.tx_bytes += skb->len - 2; | |
1da177e4 LT |
1160 | |
1161 | switch (proto) { | |
1162 | case PPP_IP: | |
cd228d54 | 1163 | if (!ppp->vj || (ppp->flags & SC_COMP_TCP) == 0) |
1da177e4 LT |
1164 | break; |
1165 | /* try to do VJ TCP header compression */ | |
1166 | new_skb = alloc_skb(skb->len + ppp->dev->hard_header_len - 2, | |
1167 | GFP_ATOMIC); | |
cd228d54 | 1168 | if (!new_skb) { |
1da177e4 LT |
1169 | printk(KERN_ERR "PPP: no memory (VJ comp pkt)\n"); |
1170 | goto drop; | |
1171 | } | |
1172 | skb_reserve(new_skb, ppp->dev->hard_header_len - 2); | |
1173 | cp = skb->data + 2; | |
1174 | len = slhc_compress(ppp->vj, cp, skb->len - 2, | |
1175 | new_skb->data + 2, &cp, | |
1176 | !(ppp->flags & SC_NO_TCP_CCID)); | |
1177 | if (cp == skb->data + 2) { | |
1178 | /* didn't compress */ | |
1179 | kfree_skb(new_skb); | |
1180 | } else { | |
1181 | if (cp[0] & SL_TYPE_COMPRESSED_TCP) { | |
1182 | proto = PPP_VJC_COMP; | |
1183 | cp[0] &= ~SL_TYPE_COMPRESSED_TCP; | |
1184 | } else { | |
1185 | proto = PPP_VJC_UNCOMP; | |
1186 | cp[0] = skb->data[2]; | |
1187 | } | |
1188 | kfree_skb(skb); | |
1189 | skb = new_skb; | |
1190 | cp = skb_put(skb, len + 2); | |
1191 | cp[0] = 0; | |
1192 | cp[1] = proto; | |
1193 | } | |
1194 | break; | |
1195 | ||
1196 | case PPP_CCP: | |
1197 | /* peek at outbound CCP frames */ | |
1198 | ppp_ccp_peek(ppp, skb, 0); | |
1199 | break; | |
1200 | } | |
1201 | ||
1202 | /* try to do packet compression */ | |
8e95a202 JP |
1203 | if ((ppp->xstate & SC_COMP_RUN) && ppp->xc_state && |
1204 | proto != PPP_LCP && proto != PPP_CCP) { | |
b3f9b92a MD |
1205 | if (!(ppp->flags & SC_CCP_UP) && (ppp->flags & SC_MUST_COMP)) { |
1206 | if (net_ratelimit()) | |
1207 | printk(KERN_ERR "ppp: compression required but down - pkt dropped.\n"); | |
1da177e4 LT |
1208 | goto drop; |
1209 | } | |
b3f9b92a MD |
1210 | skb = pad_compress_skb(ppp, skb); |
1211 | if (!skb) | |
1212 | goto drop; | |
1da177e4 LT |
1213 | } |
1214 | ||
1215 | /* | |
1216 | * If we are waiting for traffic (demand dialling), | |
1217 | * queue it up for pppd to receive. | |
1218 | */ | |
1219 | if (ppp->flags & SC_LOOP_TRAFFIC) { | |
1220 | if (ppp->file.rq.qlen > PPP_MAX_RQLEN) | |
1221 | goto drop; | |
1222 | skb_queue_tail(&ppp->file.rq, skb); | |
1223 | wake_up_interruptible(&ppp->file.rwait); | |
1224 | return; | |
1225 | } | |
1226 | ||
1227 | ppp->xmit_pending = skb; | |
1228 | ppp_push(ppp); | |
1229 | return; | |
1230 | ||
1231 | drop: | |
1d2f8c95 | 1232 | kfree_skb(skb); |
8c0469cd | 1233 | ++ppp->dev->stats.tx_errors; |
1da177e4 LT |
1234 | } |
1235 | ||
1236 | /* | |
1237 | * Try to send the frame in xmit_pending. | |
1238 | * The caller should have the xmit path locked. | |
1239 | */ | |
1240 | static void | |
1241 | ppp_push(struct ppp *ppp) | |
1242 | { | |
1243 | struct list_head *list; | |
1244 | struct channel *pch; | |
1245 | struct sk_buff *skb = ppp->xmit_pending; | |
1246 | ||
cd228d54 | 1247 | if (!skb) |
1da177e4 LT |
1248 | return; |
1249 | ||
1250 | list = &ppp->channels; | |
1251 | if (list_empty(list)) { | |
1252 | /* nowhere to send the packet, just drop it */ | |
1253 | ppp->xmit_pending = NULL; | |
1254 | kfree_skb(skb); | |
1255 | return; | |
1256 | } | |
1257 | ||
1258 | if ((ppp->flags & SC_MULTILINK) == 0) { | |
1259 | /* not doing multilink: send it down the first channel */ | |
1260 | list = list->next; | |
1261 | pch = list_entry(list, struct channel, clist); | |
1262 | ||
1263 | spin_lock_bh(&pch->downl); | |
1264 | if (pch->chan) { | |
1265 | if (pch->chan->ops->start_xmit(pch->chan, skb)) | |
1266 | ppp->xmit_pending = NULL; | |
1267 | } else { | |
1268 | /* channel got unregistered */ | |
1269 | kfree_skb(skb); | |
1270 | ppp->xmit_pending = NULL; | |
1271 | } | |
1272 | spin_unlock_bh(&pch->downl); | |
1273 | return; | |
1274 | } | |
1275 | ||
1276 | #ifdef CONFIG_PPP_MULTILINK | |
1277 | /* Multilink: fragment the packet over as many links | |
1278 | as can take the packet at the moment. */ | |
1279 | if (!ppp_mp_explode(ppp, skb)) | |
1280 | return; | |
1281 | #endif /* CONFIG_PPP_MULTILINK */ | |
1282 | ||
1283 | ppp->xmit_pending = NULL; | |
1284 | kfree_skb(skb); | |
1285 | } | |
1286 | ||
1287 | #ifdef CONFIG_PPP_MULTILINK | |
d39cd5e9 | 1288 | static bool mp_protocol_compress __read_mostly = true; |
1289 | module_param(mp_protocol_compress, bool, S_IRUGO | S_IWUSR); | |
1290 | MODULE_PARM_DESC(mp_protocol_compress, | |
1291 | "compress protocol id in multilink fragments"); | |
1292 | ||
1da177e4 LT |
1293 | /* |
1294 | * Divide a packet to be transmitted into fragments and | |
1295 | * send them out the individual links. | |
1296 | */ | |
1297 | static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb) | |
1298 | { | |
fa44a73c LS |
1299 | int len, totlen; |
1300 | int i, bits, hdrlen, mtu; | |
1301 | int flen; | |
1302 | int navail, nfree, nzero; | |
1303 | int nbigger; | |
1304 | int totspeed; | |
1305 | int totfree; | |
1da177e4 LT |
1306 | unsigned char *p, *q; |
1307 | struct list_head *list; | |
1308 | struct channel *pch; | |
1309 | struct sk_buff *frag; | |
1310 | struct ppp_channel *chan; | |
1311 | ||
9c705260 | 1312 | totspeed = 0; /*total bitrate of the bundle*/ |
fa44a73c LS |
1313 | nfree = 0; /* # channels which have no packet already queued */ |
1314 | navail = 0; /* total # of usable channels (not deregistered) */ | |
1315 | nzero = 0; /* number of channels with zero speed associated*/ | |
1316 | totfree = 0; /*total # of channels available and | |
9c705260 GP |
1317 | *having no queued packets before |
1318 | *starting the fragmentation*/ | |
1319 | ||
1da177e4 | 1320 | hdrlen = (ppp->flags & SC_MP_XSHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN; |
fa44a73c LS |
1321 | i = 0; |
1322 | list_for_each_entry(pch, &ppp->channels, clist) { | |
3429769b DC |
1323 | if (pch->chan) { |
1324 | pch->avail = 1; | |
1325 | navail++; | |
1326 | pch->speed = pch->chan->speed; | |
1327 | } else { | |
1328 | pch->avail = 0; | |
1329 | } | |
fa44a73c | 1330 | if (pch->avail) { |
b03efcfb | 1331 | if (skb_queue_empty(&pch->file.xq) || |
fa44a73c | 1332 | !pch->had_frag) { |
9c705260 GP |
1333 | if (pch->speed == 0) |
1334 | nzero++; | |
1335 | else | |
1336 | totspeed += pch->speed; | |
1337 | ||
1338 | pch->avail = 2; | |
1339 | ++nfree; | |
1340 | ++totfree; | |
1341 | } | |
fa44a73c LS |
1342 | if (!pch->had_frag && i < ppp->nxchan) |
1343 | ppp->nxchan = i; | |
1da177e4 | 1344 | } |
516cd15f | 1345 | ++i; |
1da177e4 | 1346 | } |
516cd15f | 1347 | /* |
fa44a73c LS |
1348 | * Don't start sending this packet unless at least half of |
1349 | * the channels are free. This gives much better TCP | |
1350 | * performance if we have a lot of channels. | |
516cd15f | 1351 | */ |
fa44a73c LS |
1352 | if (nfree == 0 || nfree < navail / 2) |
1353 | return 0; /* can't take now, leave it in xmit_pending */ | |
1da177e4 | 1354 | |
d39cd5e9 | 1355 | /* Do protocol field compression */ |
fa44a73c LS |
1356 | p = skb->data; |
1357 | len = skb->len; | |
d39cd5e9 | 1358 | if (*p == 0 && mp_protocol_compress) { |
1da177e4 LT |
1359 | ++p; |
1360 | --len; | |
1361 | } | |
1362 | ||
9c705260 | 1363 | totlen = len; |
fa44a73c | 1364 | nbigger = len % nfree; |
9c705260 | 1365 | |
fa44a73c LS |
1366 | /* skip to the channel after the one we last used |
1367 | and start at that one */ | |
81616c5a | 1368 | list = &ppp->channels; |
fa44a73c | 1369 | for (i = 0; i < ppp->nxchan; ++i) { |
1da177e4 | 1370 | list = list->next; |
fa44a73c LS |
1371 | if (list == &ppp->channels) { |
1372 | i = 0; | |
1da177e4 LT |
1373 | break; |
1374 | } | |
1375 | } | |
1376 | ||
fa44a73c | 1377 | /* create a fragment for each channel */ |
1da177e4 | 1378 | bits = B; |
fa44a73c | 1379 | while (len > 0) { |
1da177e4 | 1380 | list = list->next; |
fa44a73c LS |
1381 | if (list == &ppp->channels) { |
1382 | i = 0; | |
1da177e4 LT |
1383 | continue; |
1384 | } | |
fa44a73c | 1385 | pch = list_entry(list, struct channel, clist); |
1da177e4 LT |
1386 | ++i; |
1387 | if (!pch->avail) | |
1388 | continue; | |
1389 | ||
516cd15f | 1390 | /* |
fa44a73c LS |
1391 | * Skip this channel if it has a fragment pending already and |
1392 | * we haven't given a fragment to all of the free channels. | |
516cd15f PM |
1393 | */ |
1394 | if (pch->avail == 1) { | |
fa44a73c | 1395 | if (nfree > 0) |
516cd15f PM |
1396 | continue; |
1397 | } else { | |
516cd15f PM |
1398 | pch->avail = 1; |
1399 | } | |
1400 | ||
1da177e4 LT |
1401 | /* check the channel's mtu and whether it is still attached. */ |
1402 | spin_lock_bh(&pch->downl); | |
516cd15f | 1403 | if (pch->chan == NULL) { |
fa44a73c | 1404 | /* can't use this channel, it's being deregistered */ |
9c705260 GP |
1405 | if (pch->speed == 0) |
1406 | nzero--; | |
1407 | else | |
fa44a73c | 1408 | totspeed -= pch->speed; |
9c705260 | 1409 | |
1da177e4 LT |
1410 | spin_unlock_bh(&pch->downl); |
1411 | pch->avail = 0; | |
9c705260 GP |
1412 | totlen = len; |
1413 | totfree--; | |
1414 | nfree--; | |
fa44a73c | 1415 | if (--navail == 0) |
1da177e4 LT |
1416 | break; |
1417 | continue; | |
1418 | } | |
1419 | ||
1420 | /* | |
9c705260 | 1421 | *if the channel speed is not set divide |
fa44a73c | 1422 | *the packet evenly among the free channels; |
9c705260 GP |
1423 | *otherwise divide it according to the speed |
1424 | *of the channel we are going to transmit on | |
1425 | */ | |
886f9fe6 | 1426 | flen = len; |
a53a8b56 BM |
1427 | if (nfree > 0) { |
1428 | if (pch->speed == 0) { | |
536e00e5 | 1429 | flen = len/nfree; |
a53a8b56 BM |
1430 | if (nbigger > 0) { |
1431 | flen++; | |
1432 | nbigger--; | |
1433 | } | |
1434 | } else { | |
1435 | flen = (((totfree - nzero)*(totlen + hdrlen*totfree)) / | |
1436 | ((totspeed*totfree)/pch->speed)) - hdrlen; | |
1437 | if (nbigger > 0) { | |
1438 | flen += ((totfree - nzero)*pch->speed)/totspeed; | |
1439 | nbigger -= ((totfree - nzero)*pch->speed)/ | |
9c705260 | 1440 | totspeed; |
a53a8b56 | 1441 | } |
9c705260 | 1442 | } |
a53a8b56 | 1443 | nfree--; |
9c705260 | 1444 | } |
9c705260 GP |
1445 | |
1446 | /* | |
fa44a73c LS |
1447 | *check if we are on the last channel or |
1448 | *we exceded the lenght of the data to | |
9c705260 GP |
1449 | *fragment |
1450 | */ | |
a53a8b56 | 1451 | if ((nfree <= 0) || (flen > len)) |
9c705260 GP |
1452 | flen = len; |
1453 | /* | |
1454 | *it is not worth to tx on slow channels: | |
1455 | *in that case from the resulting flen according to the | |
1456 | *above formula will be equal or less than zero. | |
1457 | *Skip the channel in this case | |
1da177e4 | 1458 | */ |
fa44a73c | 1459 | if (flen <= 0) { |
9c705260 GP |
1460 | pch->avail = 2; |
1461 | spin_unlock_bh(&pch->downl); | |
1462 | continue; | |
1463 | } | |
1464 | ||
fa44a73c LS |
1465 | mtu = pch->chan->mtu - hdrlen; |
1466 | if (mtu < 4) | |
1467 | mtu = 4; | |
516cd15f PM |
1468 | if (flen > mtu) |
1469 | flen = mtu; | |
fa44a73c LS |
1470 | if (flen == len) |
1471 | bits |= E; | |
1472 | frag = alloc_skb(flen + hdrlen + (flen == 0), GFP_ATOMIC); | |
cd228d54 | 1473 | if (!frag) |
516cd15f | 1474 | goto noskb; |
fa44a73c | 1475 | q = skb_put(frag, flen + hdrlen); |
516cd15f | 1476 | |
fa44a73c | 1477 | /* make the MP header */ |
516cd15f PM |
1478 | q[0] = PPP_MP >> 8; |
1479 | q[1] = PPP_MP; | |
1480 | if (ppp->flags & SC_MP_XSHORTSEQ) { | |
fa44a73c | 1481 | q[2] = bits + ((ppp->nxseq >> 8) & 0xf); |
516cd15f PM |
1482 | q[3] = ppp->nxseq; |
1483 | } else { | |
1484 | q[2] = bits; | |
1485 | q[3] = ppp->nxseq >> 16; | |
1486 | q[4] = ppp->nxseq >> 8; | |
1487 | q[5] = ppp->nxseq; | |
1da177e4 | 1488 | } |
516cd15f | 1489 | |
9c705260 | 1490 | memcpy(q + hdrlen, p, flen); |
516cd15f PM |
1491 | |
1492 | /* try to send it down the channel */ | |
1493 | chan = pch->chan; | |
fa44a73c | 1494 | if (!skb_queue_empty(&pch->file.xq) || |
9c705260 | 1495 | !chan->ops->start_xmit(chan, frag)) |
516cd15f | 1496 | skb_queue_tail(&pch->file.xq, frag); |
fa44a73c | 1497 | pch->had_frag = 1; |
516cd15f | 1498 | p += flen; |
fa44a73c | 1499 | len -= flen; |
516cd15f PM |
1500 | ++ppp->nxseq; |
1501 | bits = 0; | |
1da177e4 | 1502 | spin_unlock_bh(&pch->downl); |
516cd15f | 1503 | } |
fa44a73c | 1504 | ppp->nxchan = i; |
1da177e4 LT |
1505 | |
1506 | return 1; | |
1507 | ||
1508 | noskb: | |
1509 | spin_unlock_bh(&pch->downl); | |
1510 | if (ppp->debug & 1) | |
fa44a73c | 1511 | printk(KERN_ERR "PPP: no memory (fragment)\n"); |
8c0469cd | 1512 | ++ppp->dev->stats.tx_errors; |
1da177e4 LT |
1513 | ++ppp->nxseq; |
1514 | return 1; /* abandon the frame */ | |
1515 | } | |
1516 | #endif /* CONFIG_PPP_MULTILINK */ | |
1517 | ||
1518 | /* | |
1519 | * Try to send data out on a channel. | |
1520 | */ | |
1521 | static void | |
1522 | ppp_channel_push(struct channel *pch) | |
1523 | { | |
1524 | struct sk_buff *skb; | |
1525 | struct ppp *ppp; | |
1526 | ||
1527 | spin_lock_bh(&pch->downl); | |
cd228d54 | 1528 | if (pch->chan) { |
b03efcfb | 1529 | while (!skb_queue_empty(&pch->file.xq)) { |
1da177e4 LT |
1530 | skb = skb_dequeue(&pch->file.xq); |
1531 | if (!pch->chan->ops->start_xmit(pch->chan, skb)) { | |
1532 | /* put the packet back and try again later */ | |
1533 | skb_queue_head(&pch->file.xq, skb); | |
1534 | break; | |
1535 | } | |
1536 | } | |
1537 | } else { | |
1538 | /* channel got deregistered */ | |
1539 | skb_queue_purge(&pch->file.xq); | |
1540 | } | |
1541 | spin_unlock_bh(&pch->downl); | |
1542 | /* see if there is anything from the attached unit to be sent */ | |
b03efcfb | 1543 | if (skb_queue_empty(&pch->file.xq)) { |
1da177e4 LT |
1544 | read_lock_bh(&pch->upl); |
1545 | ppp = pch->ppp; | |
cd228d54 | 1546 | if (ppp) |
1da177e4 LT |
1547 | ppp_xmit_process(ppp); |
1548 | read_unlock_bh(&pch->upl); | |
1549 | } | |
1550 | } | |
1551 | ||
1552 | /* | |
1553 | * Receive-side routines. | |
1554 | */ | |
1555 | ||
a00eac0c DM |
1556 | struct ppp_mp_skb_parm { |
1557 | u32 sequence; | |
1558 | u8 BEbits; | |
1559 | }; | |
1560 | #define PPP_MP_CB(skb) ((struct ppp_mp_skb_parm *)((skb)->cb)) | |
1da177e4 LT |
1561 | |
1562 | static inline void | |
1563 | ppp_do_recv(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) | |
1564 | { | |
1565 | ppp_recv_lock(ppp); | |
739840d5 | 1566 | if (!ppp->closing) |
1da177e4 LT |
1567 | ppp_receive_frame(ppp, skb, pch); |
1568 | else | |
1569 | kfree_skb(skb); | |
1570 | ppp_recv_unlock(ppp); | |
1571 | } | |
1572 | ||
1573 | void | |
1574 | ppp_input(struct ppp_channel *chan, struct sk_buff *skb) | |
1575 | { | |
1576 | struct channel *pch = chan->ppp; | |
1577 | int proto; | |
1578 | ||
ea8420e9 | 1579 | if (!pch) { |
1da177e4 LT |
1580 | kfree_skb(skb); |
1581 | return; | |
1582 | } | |
516cd15f | 1583 | |
1da177e4 | 1584 | read_lock_bh(&pch->upl); |
ea8420e9 SA |
1585 | if (!pskb_may_pull(skb, 2)) { |
1586 | kfree_skb(skb); | |
1587 | if (pch->ppp) { | |
1588 | ++pch->ppp->dev->stats.rx_length_errors; | |
1589 | ppp_receive_error(pch->ppp); | |
1590 | } | |
1591 | goto done; | |
1592 | } | |
1593 | ||
1594 | proto = PPP_PROTO(skb); | |
cd228d54 | 1595 | if (!pch->ppp || proto >= 0xc000 || proto == PPP_CCPFRAG) { |
1da177e4 LT |
1596 | /* put it on the channel queue */ |
1597 | skb_queue_tail(&pch->file.rq, skb); | |
1598 | /* drop old frames if queue too long */ | |
8e95a202 JP |
1599 | while (pch->file.rq.qlen > PPP_MAX_RQLEN && |
1600 | (skb = skb_dequeue(&pch->file.rq))) | |
1da177e4 LT |
1601 | kfree_skb(skb); |
1602 | wake_up_interruptible(&pch->file.rwait); | |
1603 | } else { | |
1604 | ppp_do_recv(pch->ppp, skb, pch); | |
1605 | } | |
ea8420e9 SA |
1606 | |
1607 | done: | |
1da177e4 LT |
1608 | read_unlock_bh(&pch->upl); |
1609 | } | |
1610 | ||
1611 | /* Put a 0-length skb in the receive queue as an error indication */ | |
1612 | void | |
1613 | ppp_input_error(struct ppp_channel *chan, int code) | |
1614 | { | |
1615 | struct channel *pch = chan->ppp; | |
1616 | struct sk_buff *skb; | |
1617 | ||
cd228d54 | 1618 | if (!pch) |
1da177e4 LT |
1619 | return; |
1620 | ||
1621 | read_lock_bh(&pch->upl); | |
cd228d54 | 1622 | if (pch->ppp) { |
1da177e4 | 1623 | skb = alloc_skb(0, GFP_ATOMIC); |
cd228d54 | 1624 | if (skb) { |
1da177e4 LT |
1625 | skb->len = 0; /* probably unnecessary */ |
1626 | skb->cb[0] = code; | |
1627 | ppp_do_recv(pch->ppp, skb, pch); | |
1628 | } | |
1629 | } | |
1630 | read_unlock_bh(&pch->upl); | |
1631 | } | |
1632 | ||
1633 | /* | |
1634 | * We come in here to process a received frame. | |
1635 | * The receive side of the ppp unit is locked. | |
1636 | */ | |
1637 | static void | |
1638 | ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) | |
1639 | { | |
ea8420e9 SA |
1640 | /* note: a 0-length skb is used as an error indication */ |
1641 | if (skb->len > 0) { | |
1da177e4 LT |
1642 | #ifdef CONFIG_PPP_MULTILINK |
1643 | /* XXX do channel-level decompression here */ | |
1644 | if (PPP_PROTO(skb) == PPP_MP) | |
1645 | ppp_receive_mp_frame(ppp, skb, pch); | |
1646 | else | |
1647 | #endif /* CONFIG_PPP_MULTILINK */ | |
1648 | ppp_receive_nonmp_frame(ppp, skb); | |
ea8420e9 SA |
1649 | } else { |
1650 | kfree_skb(skb); | |
1651 | ppp_receive_error(ppp); | |
1da177e4 | 1652 | } |
1da177e4 LT |
1653 | } |
1654 | ||
1655 | static void | |
1656 | ppp_receive_error(struct ppp *ppp) | |
1657 | { | |
8c0469cd | 1658 | ++ppp->dev->stats.rx_errors; |
cd228d54 | 1659 | if (ppp->vj) |
1da177e4 LT |
1660 | slhc_toss(ppp->vj); |
1661 | } | |
1662 | ||
1663 | static void | |
1664 | ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb) | |
1665 | { | |
1666 | struct sk_buff *ns; | |
1667 | int proto, len, npi; | |
1668 | ||
1669 | /* | |
1670 | * Decompress the frame, if compressed. | |
1671 | * Note that some decompressors need to see uncompressed frames | |
1672 | * that come in as well as compressed frames. | |
1673 | */ | |
8e95a202 JP |
1674 | if (ppp->rc_state && (ppp->rstate & SC_DECOMP_RUN) && |
1675 | (ppp->rstate & (SC_DC_FERROR | SC_DC_ERROR)) == 0) | |
1da177e4 LT |
1676 | skb = ppp_decompress_frame(ppp, skb); |
1677 | ||
b3f9b92a MD |
1678 | if (ppp->flags & SC_MUST_COMP && ppp->rstate & SC_DC_FERROR) |
1679 | goto err; | |
1680 | ||
1da177e4 LT |
1681 | proto = PPP_PROTO(skb); |
1682 | switch (proto) { | |
1683 | case PPP_VJC_COMP: | |
1684 | /* decompress VJ compressed packets */ | |
cd228d54 | 1685 | if (!ppp->vj || (ppp->flags & SC_REJ_COMP_TCP)) |
1da177e4 LT |
1686 | goto err; |
1687 | ||
2a38b775 | 1688 | if (skb_tailroom(skb) < 124 || skb_cloned(skb)) { |
1da177e4 LT |
1689 | /* copy to a new sk_buff with more tailroom */ |
1690 | ns = dev_alloc_skb(skb->len + 128); | |
cd228d54 | 1691 | if (!ns) { |
1da177e4 LT |
1692 | printk(KERN_ERR"PPP: no memory (VJ decomp)\n"); |
1693 | goto err; | |
1694 | } | |
1695 | skb_reserve(ns, 2); | |
1696 | skb_copy_bits(skb, 0, skb_put(ns, skb->len), skb->len); | |
1697 | kfree_skb(skb); | |
1698 | skb = ns; | |
1699 | } | |
e3f749c4 HX |
1700 | else |
1701 | skb->ip_summed = CHECKSUM_NONE; | |
1da177e4 LT |
1702 | |
1703 | len = slhc_uncompress(ppp->vj, skb->data + 2, skb->len - 2); | |
1704 | if (len <= 0) { | |
1705 | printk(KERN_DEBUG "PPP: VJ decompression error\n"); | |
1706 | goto err; | |
1707 | } | |
1708 | len += 2; | |
1709 | if (len > skb->len) | |
1710 | skb_put(skb, len - skb->len); | |
1711 | else if (len < skb->len) | |
1712 | skb_trim(skb, len); | |
1713 | proto = PPP_IP; | |
1714 | break; | |
1715 | ||
1716 | case PPP_VJC_UNCOMP: | |
cd228d54 | 1717 | if (!ppp->vj || (ppp->flags & SC_REJ_COMP_TCP)) |
1da177e4 | 1718 | goto err; |
6aa20a22 | 1719 | |
1da177e4 LT |
1720 | /* Until we fix the decompressor need to make sure |
1721 | * data portion is linear. | |
1722 | */ | |
6aa20a22 | 1723 | if (!pskb_may_pull(skb, skb->len)) |
1da177e4 LT |
1724 | goto err; |
1725 | ||
1726 | if (slhc_remember(ppp->vj, skb->data + 2, skb->len - 2) <= 0) { | |
1727 | printk(KERN_ERR "PPP: VJ uncompressed error\n"); | |
1728 | goto err; | |
1729 | } | |
1730 | proto = PPP_IP; | |
1731 | break; | |
1732 | ||
1733 | case PPP_CCP: | |
1734 | ppp_ccp_peek(ppp, skb, 1); | |
1735 | break; | |
1736 | } | |
1737 | ||
8c0469cd PZ |
1738 | ++ppp->dev->stats.rx_packets; |
1739 | ppp->dev->stats.rx_bytes += skb->len - 2; | |
1da177e4 LT |
1740 | |
1741 | npi = proto_to_npindex(proto); | |
1742 | if (npi < 0) { | |
1743 | /* control or unknown frame - pass it to pppd */ | |
1744 | skb_queue_tail(&ppp->file.rq, skb); | |
1745 | /* limit queue length by dropping old frames */ | |
8e95a202 JP |
1746 | while (ppp->file.rq.qlen > PPP_MAX_RQLEN && |
1747 | (skb = skb_dequeue(&ppp->file.rq))) | |
1da177e4 LT |
1748 | kfree_skb(skb); |
1749 | /* wake up any process polling or blocking on read */ | |
1750 | wake_up_interruptible(&ppp->file.rwait); | |
1751 | ||
1752 | } else { | |
1753 | /* network protocol frame - give it to the kernel */ | |
1754 | ||
1755 | #ifdef CONFIG_PPP_FILTER | |
1756 | /* check if the packet passes the pass and active filters */ | |
1757 | /* the filter instructions are constructed assuming | |
1758 | a four-byte PPP header on each packet */ | |
2a38b775 HX |
1759 | if (ppp->pass_filter || ppp->active_filter) { |
1760 | if (skb_cloned(skb) && | |
1761 | pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) | |
1762 | goto err; | |
1763 | ||
1764 | *skb_push(skb, 2) = 0; | |
8e95a202 JP |
1765 | if (ppp->pass_filter && |
1766 | sk_run_filter(skb, ppp->pass_filter, | |
1767 | ppp->pass_len) == 0) { | |
2a38b775 HX |
1768 | if (ppp->debug & 1) |
1769 | printk(KERN_DEBUG "PPP: inbound frame " | |
1770 | "not passed\n"); | |
1771 | kfree_skb(skb); | |
1772 | return; | |
1773 | } | |
8e95a202 JP |
1774 | if (!(ppp->active_filter && |
1775 | sk_run_filter(skb, ppp->active_filter, | |
1776 | ppp->active_len) == 0)) | |
2a38b775 HX |
1777 | ppp->last_recv = jiffies; |
1778 | __skb_pull(skb, 2); | |
1779 | } else | |
1da177e4 | 1780 | #endif /* CONFIG_PPP_FILTER */ |
2a38b775 | 1781 | ppp->last_recv = jiffies; |
1da177e4 | 1782 | |
8e95a202 JP |
1783 | if ((ppp->dev->flags & IFF_UP) == 0 || |
1784 | ppp->npmode[npi] != NPMODE_PASS) { | |
1da177e4 LT |
1785 | kfree_skb(skb); |
1786 | } else { | |
cbb042f9 HX |
1787 | /* chop off protocol */ |
1788 | skb_pull_rcsum(skb, 2); | |
1da177e4 LT |
1789 | skb->dev = ppp->dev; |
1790 | skb->protocol = htons(npindex_to_ethertype[npi]); | |
459a98ed | 1791 | skb_reset_mac_header(skb); |
1da177e4 | 1792 | netif_rx(skb); |
1da177e4 LT |
1793 | } |
1794 | } | |
1795 | return; | |
1796 | ||
1797 | err: | |
1798 | kfree_skb(skb); | |
1799 | ppp_receive_error(ppp); | |
1800 | } | |
1801 | ||
1802 | static struct sk_buff * | |
1803 | ppp_decompress_frame(struct ppp *ppp, struct sk_buff *skb) | |
1804 | { | |
1805 | int proto = PPP_PROTO(skb); | |
1806 | struct sk_buff *ns; | |
1807 | int len; | |
1808 | ||
1809 | /* Until we fix all the decompressor's need to make sure | |
1810 | * data portion is linear. | |
1811 | */ | |
1812 | if (!pskb_may_pull(skb, skb->len)) | |
1813 | goto err; | |
1814 | ||
1815 | if (proto == PPP_COMP) { | |
4b2a8fb3 KS |
1816 | int obuff_size; |
1817 | ||
1818 | switch(ppp->rcomp->compress_proto) { | |
1819 | case CI_MPPE: | |
1820 | obuff_size = ppp->mru + PPP_HDRLEN + 1; | |
1821 | break; | |
1822 | default: | |
1823 | obuff_size = ppp->mru + PPP_HDRLEN; | |
1824 | break; | |
1825 | } | |
1826 | ||
1827 | ns = dev_alloc_skb(obuff_size); | |
cd228d54 | 1828 | if (!ns) { |
1da177e4 LT |
1829 | printk(KERN_ERR "ppp_decompress_frame: no memory\n"); |
1830 | goto err; | |
1831 | } | |
1832 | /* the decompressor still expects the A/C bytes in the hdr */ | |
1833 | len = ppp->rcomp->decompress(ppp->rc_state, skb->data - 2, | |
06c7af56 | 1834 | skb->len + 2, ns->data, obuff_size); |
1da177e4 LT |
1835 | if (len < 0) { |
1836 | /* Pass the compressed frame to pppd as an | |
1837 | error indication. */ | |
1838 | if (len == DECOMP_FATALERROR) | |
1839 | ppp->rstate |= SC_DC_FERROR; | |
1840 | kfree_skb(ns); | |
1841 | goto err; | |
1842 | } | |
1843 | ||
1844 | kfree_skb(skb); | |
1845 | skb = ns; | |
1846 | skb_put(skb, len); | |
1847 | skb_pull(skb, 2); /* pull off the A/C bytes */ | |
1848 | ||
1849 | } else { | |
1850 | /* Uncompressed frame - pass to decompressor so it | |
1851 | can update its dictionary if necessary. */ | |
1852 | if (ppp->rcomp->incomp) | |
1853 | ppp->rcomp->incomp(ppp->rc_state, skb->data - 2, | |
1854 | skb->len + 2); | |
1855 | } | |
1856 | ||
1857 | return skb; | |
1858 | ||
1859 | err: | |
1860 | ppp->rstate |= SC_DC_ERROR; | |
1861 | ppp_receive_error(ppp); | |
1862 | return skb; | |
1863 | } | |
1864 | ||
1865 | #ifdef CONFIG_PPP_MULTILINK | |
1866 | /* | |
1867 | * Receive a multilink frame. | |
1868 | * We put it on the reconstruction queue and then pull off | |
1869 | * as many completed frames as we can. | |
1870 | */ | |
1871 | static void | |
1872 | ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) | |
1873 | { | |
1874 | u32 mask, seq; | |
81616c5a | 1875 | struct channel *ch; |
1da177e4 LT |
1876 | int mphdrlen = (ppp->flags & SC_MP_SHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN; |
1877 | ||
2a38b775 | 1878 | if (!pskb_may_pull(skb, mphdrlen + 1) || ppp->mrru == 0) |
1da177e4 LT |
1879 | goto err; /* no good, throw it away */ |
1880 | ||
1881 | /* Decode sequence number and begin/end bits */ | |
1882 | if (ppp->flags & SC_MP_SHORTSEQ) { | |
1883 | seq = ((skb->data[2] & 0x0f) << 8) | skb->data[3]; | |
1884 | mask = 0xfff; | |
1885 | } else { | |
1886 | seq = (skb->data[3] << 16) | (skb->data[4] << 8)| skb->data[5]; | |
1887 | mask = 0xffffff; | |
1888 | } | |
a00eac0c | 1889 | PPP_MP_CB(skb)->BEbits = skb->data[2]; |
1da177e4 LT |
1890 | skb_pull(skb, mphdrlen); /* pull off PPP and MP headers */ |
1891 | ||
1892 | /* | |
1893 | * Do protocol ID decompression on the first fragment of each packet. | |
1894 | */ | |
a00eac0c | 1895 | if ((PPP_MP_CB(skb)->BEbits & B) && (skb->data[0] & 1)) |
1da177e4 LT |
1896 | *skb_push(skb, 1) = 0; |
1897 | ||
1898 | /* | |
1899 | * Expand sequence number to 32 bits, making it as close | |
1900 | * as possible to ppp->minseq. | |
1901 | */ | |
1902 | seq |= ppp->minseq & ~mask; | |
1903 | if ((int)(ppp->minseq - seq) > (int)(mask >> 1)) | |
1904 | seq += mask + 1; | |
1905 | else if ((int)(seq - ppp->minseq) > (int)(mask >> 1)) | |
1906 | seq -= mask + 1; /* should never happen */ | |
a00eac0c | 1907 | PPP_MP_CB(skb)->sequence = seq; |
1da177e4 LT |
1908 | pch->lastseq = seq; |
1909 | ||
1910 | /* | |
1911 | * If this packet comes before the next one we were expecting, | |
1912 | * drop it. | |
1913 | */ | |
1914 | if (seq_before(seq, ppp->nextseq)) { | |
1915 | kfree_skb(skb); | |
8c0469cd | 1916 | ++ppp->dev->stats.rx_dropped; |
1da177e4 LT |
1917 | ppp_receive_error(ppp); |
1918 | return; | |
1919 | } | |
1920 | ||
1921 | /* | |
1922 | * Reevaluate minseq, the minimum over all channels of the | |
1923 | * last sequence number received on each channel. Because of | |
1924 | * the increasing sequence number rule, we know that any fragment | |
1925 | * before `minseq' which hasn't arrived is never going to arrive. | |
1926 | * The list of channels can't change because we have the receive | |
1927 | * side of the ppp unit locked. | |
1928 | */ | |
81616c5a | 1929 | list_for_each_entry(ch, &ppp->channels, clist) { |
1da177e4 LT |
1930 | if (seq_before(ch->lastseq, seq)) |
1931 | seq = ch->lastseq; | |
1932 | } | |
1933 | if (seq_before(ppp->minseq, seq)) | |
1934 | ppp->minseq = seq; | |
1935 | ||
1936 | /* Put the fragment on the reconstruction queue */ | |
1937 | ppp_mp_insert(ppp, skb); | |
1938 | ||
1939 | /* If the queue is getting long, don't wait any longer for packets | |
1940 | before the start of the queue. */ | |
38ce7c73 | 1941 | if (skb_queue_len(&ppp->mrq) >= PPP_MP_MAX_QLEN) { |
c6b20d94 | 1942 | struct sk_buff *mskb = skb_peek(&ppp->mrq); |
a00eac0c DM |
1943 | if (seq_before(ppp->minseq, PPP_MP_CB(mskb)->sequence)) |
1944 | ppp->minseq = PPP_MP_CB(mskb)->sequence; | |
38ce7c73 | 1945 | } |
1da177e4 LT |
1946 | |
1947 | /* Pull completed packets off the queue and receive them. */ | |
82b3cc1a BM |
1948 | while ((skb = ppp_mp_reconstruct(ppp))) { |
1949 | if (pskb_may_pull(skb, 2)) | |
1950 | ppp_receive_nonmp_frame(ppp, skb); | |
1951 | else { | |
1952 | ++ppp->dev->stats.rx_length_errors; | |
1953 | kfree_skb(skb); | |
1954 | ppp_receive_error(ppp); | |
1955 | } | |
1956 | } | |
1da177e4 LT |
1957 | |
1958 | return; | |
1959 | ||
1960 | err: | |
1961 | kfree_skb(skb); | |
1962 | ppp_receive_error(ppp); | |
1963 | } | |
1964 | ||
1965 | /* | |
1966 | * Insert a fragment on the MP reconstruction queue. | |
1967 | * The queue is ordered by increasing sequence number. | |
1968 | */ | |
1969 | static void | |
1970 | ppp_mp_insert(struct ppp *ppp, struct sk_buff *skb) | |
1971 | { | |
1972 | struct sk_buff *p; | |
1973 | struct sk_buff_head *list = &ppp->mrq; | |
a00eac0c | 1974 | u32 seq = PPP_MP_CB(skb)->sequence; |
1da177e4 LT |
1975 | |
1976 | /* N.B. we don't need to lock the list lock because we have the | |
1977 | ppp unit receive-side lock. */ | |
13c9821e | 1978 | skb_queue_walk(list, p) { |
a00eac0c | 1979 | if (seq_before(seq, PPP_MP_CB(p)->sequence)) |
1da177e4 | 1980 | break; |
13c9821e | 1981 | } |
43f59c89 | 1982 | __skb_queue_before(list, p, skb); |
1da177e4 LT |
1983 | } |
1984 | ||
1985 | /* | |
1986 | * Reconstruct a packet from the MP fragment queue. | |
1987 | * We go through increasing sequence numbers until we find a | |
1988 | * complete packet, or we get to the sequence number for a fragment | |
1989 | * which hasn't arrived but might still do so. | |
1990 | */ | |
3c582b30 | 1991 | static struct sk_buff * |
1da177e4 LT |
1992 | ppp_mp_reconstruct(struct ppp *ppp) |
1993 | { | |
1994 | u32 seq = ppp->nextseq; | |
1995 | u32 minseq = ppp->minseq; | |
1996 | struct sk_buff_head *list = &ppp->mrq; | |
1997 | struct sk_buff *p, *next; | |
1998 | struct sk_buff *head, *tail; | |
1999 | struct sk_buff *skb = NULL; | |
2000 | int lost = 0, len = 0; | |
2001 | ||
2002 | if (ppp->mrru == 0) /* do nothing until mrru is set */ | |
2003 | return NULL; | |
2004 | head = list->next; | |
2005 | tail = NULL; | |
2006 | for (p = head; p != (struct sk_buff *) list; p = next) { | |
2007 | next = p->next; | |
a00eac0c | 2008 | if (seq_before(PPP_MP_CB(p)->sequence, seq)) { |
1da177e4 LT |
2009 | /* this can't happen, anyway ignore the skb */ |
2010 | printk(KERN_ERR "ppp_mp_reconstruct bad seq %u < %u\n", | |
a00eac0c | 2011 | PPP_MP_CB(p)->sequence, seq); |
1da177e4 LT |
2012 | head = next; |
2013 | continue; | |
2014 | } | |
a00eac0c | 2015 | if (PPP_MP_CB(p)->sequence != seq) { |
1da177e4 LT |
2016 | /* Fragment `seq' is missing. If it is after |
2017 | minseq, it might arrive later, so stop here. */ | |
2018 | if (seq_after(seq, minseq)) | |
2019 | break; | |
2020 | /* Fragment `seq' is lost, keep going. */ | |
2021 | lost = 1; | |
a00eac0c DM |
2022 | seq = seq_before(minseq, PPP_MP_CB(p)->sequence)? |
2023 | minseq + 1: PPP_MP_CB(p)->sequence; | |
1da177e4 LT |
2024 | next = p; |
2025 | continue; | |
2026 | } | |
2027 | ||
2028 | /* | |
2029 | * At this point we know that all the fragments from | |
2030 | * ppp->nextseq to seq are either present or lost. | |
2031 | * Also, there are no complete packets in the queue | |
2032 | * that have no missing fragments and end before this | |
2033 | * fragment. | |
2034 | */ | |
2035 | ||
2036 | /* B bit set indicates this fragment starts a packet */ | |
a00eac0c | 2037 | if (PPP_MP_CB(p)->BEbits & B) { |
1da177e4 LT |
2038 | head = p; |
2039 | lost = 0; | |
2040 | len = 0; | |
2041 | } | |
2042 | ||
2043 | len += p->len; | |
2044 | ||
2045 | /* Got a complete packet yet? */ | |
a00eac0c DM |
2046 | if (lost == 0 && (PPP_MP_CB(p)->BEbits & E) && |
2047 | (PPP_MP_CB(head)->BEbits & B)) { | |
1da177e4 | 2048 | if (len > ppp->mrru + 2) { |
8c0469cd | 2049 | ++ppp->dev->stats.rx_length_errors; |
1da177e4 LT |
2050 | printk(KERN_DEBUG "PPP: reconstructed packet" |
2051 | " is too long (%d)\n", len); | |
2052 | } else if (p == head) { | |
2053 | /* fragment is complete packet - reuse skb */ | |
2054 | tail = p; | |
2055 | skb = skb_get(p); | |
2056 | break; | |
2057 | } else if ((skb = dev_alloc_skb(len)) == NULL) { | |
8c0469cd | 2058 | ++ppp->dev->stats.rx_missed_errors; |
1da177e4 LT |
2059 | printk(KERN_DEBUG "PPP: no memory for " |
2060 | "reconstructed packet"); | |
2061 | } else { | |
2062 | tail = p; | |
2063 | break; | |
2064 | } | |
2065 | ppp->nextseq = seq + 1; | |
2066 | } | |
2067 | ||
2068 | /* | |
2069 | * If this is the ending fragment of a packet, | |
2070 | * and we haven't found a complete valid packet yet, | |
2071 | * we can discard up to and including this fragment. | |
2072 | */ | |
a00eac0c | 2073 | if (PPP_MP_CB(p)->BEbits & E) |
1da177e4 LT |
2074 | head = next; |
2075 | ||
2076 | ++seq; | |
2077 | } | |
2078 | ||
2079 | /* If we have a complete packet, copy it all into one skb. */ | |
2080 | if (tail != NULL) { | |
2081 | /* If we have discarded any fragments, | |
2082 | signal a receive error. */ | |
a00eac0c | 2083 | if (PPP_MP_CB(head)->sequence != ppp->nextseq) { |
1da177e4 LT |
2084 | if (ppp->debug & 1) |
2085 | printk(KERN_DEBUG " missed pkts %u..%u\n", | |
a00eac0c DM |
2086 | ppp->nextseq, |
2087 | PPP_MP_CB(head)->sequence-1); | |
8c0469cd | 2088 | ++ppp->dev->stats.rx_dropped; |
1da177e4 LT |
2089 | ppp_receive_error(ppp); |
2090 | } | |
2091 | ||
2092 | if (head != tail) | |
2093 | /* copy to a single skb */ | |
2094 | for (p = head; p != tail->next; p = p->next) | |
2095 | skb_copy_bits(p, 0, skb_put(skb, p->len), p->len); | |
a00eac0c | 2096 | ppp->nextseq = PPP_MP_CB(tail)->sequence + 1; |
1da177e4 LT |
2097 | head = tail->next; |
2098 | } | |
2099 | ||
2100 | /* Discard all the skbuffs that we have copied the data out of | |
2101 | or that we can't use. */ | |
2102 | while ((p = list->next) != head) { | |
2103 | __skb_unlink(p, list); | |
2104 | kfree_skb(p); | |
2105 | } | |
2106 | ||
2107 | return skb; | |
2108 | } | |
2109 | #endif /* CONFIG_PPP_MULTILINK */ | |
2110 | ||
2111 | /* | |
2112 | * Channel interface. | |
2113 | */ | |
2114 | ||
273ec51d CG |
2115 | /* Create a new, unattached ppp channel. */ |
2116 | int ppp_register_channel(struct ppp_channel *chan) | |
2117 | { | |
2118 | return ppp_register_net_channel(current->nsproxy->net_ns, chan); | |
2119 | } | |
2120 | ||
2121 | /* Create a new, unattached ppp channel for specified net. */ | |
2122 | int ppp_register_net_channel(struct net *net, struct ppp_channel *chan) | |
1da177e4 LT |
2123 | { |
2124 | struct channel *pch; | |
273ec51d | 2125 | struct ppp_net *pn; |
1da177e4 | 2126 | |
d4274b51 | 2127 | pch = kzalloc(sizeof(struct channel), GFP_KERNEL); |
cd228d54 | 2128 | if (!pch) |
1da177e4 | 2129 | return -ENOMEM; |
273ec51d CG |
2130 | |
2131 | pn = ppp_pernet(net); | |
2132 | ||
1da177e4 LT |
2133 | pch->ppp = NULL; |
2134 | pch->chan = chan; | |
273ec51d | 2135 | pch->chan_net = net; |
1da177e4 LT |
2136 | chan->ppp = pch; |
2137 | init_ppp_file(&pch->file, CHANNEL); | |
2138 | pch->file.hdrlen = chan->hdrlen; | |
2139 | #ifdef CONFIG_PPP_MULTILINK | |
2140 | pch->lastseq = -1; | |
2141 | #endif /* CONFIG_PPP_MULTILINK */ | |
2142 | init_rwsem(&pch->chan_sem); | |
2143 | spin_lock_init(&pch->downl); | |
2144 | rwlock_init(&pch->upl); | |
273ec51d CG |
2145 | |
2146 | spin_lock_bh(&pn->all_channels_lock); | |
2147 | pch->file.index = ++pn->last_channel_index; | |
2148 | list_add(&pch->list, &pn->new_channels); | |
1da177e4 | 2149 | atomic_inc(&channel_count); |
273ec51d CG |
2150 | spin_unlock_bh(&pn->all_channels_lock); |
2151 | ||
1da177e4 LT |
2152 | return 0; |
2153 | } | |
2154 | ||
2155 | /* | |
2156 | * Return the index of a channel. | |
2157 | */ | |
2158 | int ppp_channel_index(struct ppp_channel *chan) | |
2159 | { | |
2160 | struct channel *pch = chan->ppp; | |
2161 | ||
cd228d54 | 2162 | if (pch) |
1da177e4 LT |
2163 | return pch->file.index; |
2164 | return -1; | |
2165 | } | |
2166 | ||
2167 | /* | |
2168 | * Return the PPP unit number to which a channel is connected. | |
2169 | */ | |
2170 | int ppp_unit_number(struct ppp_channel *chan) | |
2171 | { | |
2172 | struct channel *pch = chan->ppp; | |
2173 | int unit = -1; | |
2174 | ||
cd228d54 | 2175 | if (pch) { |
1da177e4 | 2176 | read_lock_bh(&pch->upl); |
cd228d54 | 2177 | if (pch->ppp) |
1da177e4 LT |
2178 | unit = pch->ppp->file.index; |
2179 | read_unlock_bh(&pch->upl); | |
2180 | } | |
2181 | return unit; | |
2182 | } | |
2183 | ||
63f96072 JC |
2184 | /* |
2185 | * Return the PPP device interface name of a channel. | |
2186 | */ | |
2187 | char *ppp_dev_name(struct ppp_channel *chan) | |
2188 | { | |
2189 | struct channel *pch = chan->ppp; | |
2190 | char *name = NULL; | |
2191 | ||
2192 | if (pch) { | |
2193 | read_lock_bh(&pch->upl); | |
2194 | if (pch->ppp && pch->ppp->dev) | |
2195 | name = pch->ppp->dev->name; | |
2196 | read_unlock_bh(&pch->upl); | |
2197 | } | |
2198 | return name; | |
2199 | } | |
2200 | ||
2201 | ||
1da177e4 LT |
2202 | /* |
2203 | * Disconnect a channel from the generic layer. | |
2204 | * This must be called in process context. | |
2205 | */ | |
2206 | void | |
2207 | ppp_unregister_channel(struct ppp_channel *chan) | |
2208 | { | |
2209 | struct channel *pch = chan->ppp; | |
273ec51d | 2210 | struct ppp_net *pn; |
1da177e4 | 2211 | |
cd228d54 | 2212 | if (!pch) |
1da177e4 | 2213 | return; /* should never happen */ |
273ec51d | 2214 | |
1da177e4 LT |
2215 | chan->ppp = NULL; |
2216 | ||
2217 | /* | |
2218 | * This ensures that we have returned from any calls into the | |
2219 | * the channel's start_xmit or ioctl routine before we proceed. | |
2220 | */ | |
2221 | down_write(&pch->chan_sem); | |
2222 | spin_lock_bh(&pch->downl); | |
2223 | pch->chan = NULL; | |
2224 | spin_unlock_bh(&pch->downl); | |
2225 | up_write(&pch->chan_sem); | |
2226 | ppp_disconnect_channel(pch); | |
273ec51d CG |
2227 | |
2228 | pn = ppp_pernet(pch->chan_net); | |
2229 | spin_lock_bh(&pn->all_channels_lock); | |
1da177e4 | 2230 | list_del(&pch->list); |
273ec51d CG |
2231 | spin_unlock_bh(&pn->all_channels_lock); |
2232 | ||
1da177e4 LT |
2233 | pch->file.dead = 1; |
2234 | wake_up_interruptible(&pch->file.rwait); | |
2235 | if (atomic_dec_and_test(&pch->file.refcnt)) | |
2236 | ppp_destroy_channel(pch); | |
2237 | } | |
2238 | ||
2239 | /* | |
2240 | * Callback from a channel when it can accept more to transmit. | |
2241 | * This should be called at BH/softirq level, not interrupt level. | |
2242 | */ | |
2243 | void | |
2244 | ppp_output_wakeup(struct ppp_channel *chan) | |
2245 | { | |
2246 | struct channel *pch = chan->ppp; | |
2247 | ||
cd228d54 | 2248 | if (!pch) |
1da177e4 LT |
2249 | return; |
2250 | ppp_channel_push(pch); | |
2251 | } | |
2252 | ||
2253 | /* | |
2254 | * Compression control. | |
2255 | */ | |
2256 | ||
2257 | /* Process the PPPIOCSCOMPRESS ioctl. */ | |
2258 | static int | |
2259 | ppp_set_compress(struct ppp *ppp, unsigned long arg) | |
2260 | { | |
2261 | int err; | |
2262 | struct compressor *cp, *ocomp; | |
2263 | struct ppp_option_data data; | |
2264 | void *state, *ostate; | |
2265 | unsigned char ccp_option[CCP_MAX_OPTION_LENGTH]; | |
2266 | ||
2267 | err = -EFAULT; | |
8e95a202 JP |
2268 | if (copy_from_user(&data, (void __user *) arg, sizeof(data)) || |
2269 | (data.length <= CCP_MAX_OPTION_LENGTH && | |
2270 | copy_from_user(ccp_option, (void __user *) data.ptr, data.length))) | |
1da177e4 LT |
2271 | goto out; |
2272 | err = -EINVAL; | |
8e95a202 JP |
2273 | if (data.length > CCP_MAX_OPTION_LENGTH || |
2274 | ccp_option[1] < 2 || ccp_option[1] > data.length) | |
1da177e4 LT |
2275 | goto out; |
2276 | ||
a65e5d78 JB |
2277 | cp = try_then_request_module( |
2278 | find_compressor(ccp_option[0]), | |
2279 | "ppp-compress-%d", ccp_option[0]); | |
cd228d54 | 2280 | if (!cp) |
1da177e4 LT |
2281 | goto out; |
2282 | ||
2283 | err = -ENOBUFS; | |
2284 | if (data.transmit) { | |
2285 | state = cp->comp_alloc(ccp_option, data.length); | |
cd228d54 | 2286 | if (state) { |
1da177e4 LT |
2287 | ppp_xmit_lock(ppp); |
2288 | ppp->xstate &= ~SC_COMP_RUN; | |
2289 | ocomp = ppp->xcomp; | |
2290 | ostate = ppp->xc_state; | |
2291 | ppp->xcomp = cp; | |
2292 | ppp->xc_state = state; | |
2293 | ppp_xmit_unlock(ppp); | |
cd228d54 | 2294 | if (ostate) { |
1da177e4 LT |
2295 | ocomp->comp_free(ostate); |
2296 | module_put(ocomp->owner); | |
2297 | } | |
2298 | err = 0; | |
2299 | } else | |
2300 | module_put(cp->owner); | |
2301 | ||
2302 | } else { | |
2303 | state = cp->decomp_alloc(ccp_option, data.length); | |
cd228d54 | 2304 | if (state) { |
1da177e4 LT |
2305 | ppp_recv_lock(ppp); |
2306 | ppp->rstate &= ~SC_DECOMP_RUN; | |
2307 | ocomp = ppp->rcomp; | |
2308 | ostate = ppp->rc_state; | |
2309 | ppp->rcomp = cp; | |
2310 | ppp->rc_state = state; | |
2311 | ppp_recv_unlock(ppp); | |
cd228d54 | 2312 | if (ostate) { |
1da177e4 LT |
2313 | ocomp->decomp_free(ostate); |
2314 | module_put(ocomp->owner); | |
2315 | } | |
2316 | err = 0; | |
2317 | } else | |
2318 | module_put(cp->owner); | |
2319 | } | |
2320 | ||
2321 | out: | |
2322 | return err; | |
2323 | } | |
2324 | ||
2325 | /* | |
2326 | * Look at a CCP packet and update our state accordingly. | |
2327 | * We assume the caller has the xmit or recv path locked. | |
2328 | */ | |
2329 | static void | |
2330 | ppp_ccp_peek(struct ppp *ppp, struct sk_buff *skb, int inbound) | |
2331 | { | |
2332 | unsigned char *dp; | |
2333 | int len; | |
2334 | ||
2335 | if (!pskb_may_pull(skb, CCP_HDRLEN + 2)) | |
2336 | return; /* no header */ | |
2337 | dp = skb->data + 2; | |
2338 | ||
2339 | switch (CCP_CODE(dp)) { | |
2340 | case CCP_CONFREQ: | |
2341 | ||
6aa20a22 | 2342 | /* A ConfReq starts negotiation of compression |
1da177e4 LT |
2343 | * in one direction of transmission, |
2344 | * and hence brings it down...but which way? | |
2345 | * | |
2346 | * Remember: | |
2347 | * A ConfReq indicates what the sender would like to receive | |
2348 | */ | |
2349 | if(inbound) | |
2350 | /* He is proposing what I should send */ | |
2351 | ppp->xstate &= ~SC_COMP_RUN; | |
6aa20a22 | 2352 | else |
1da177e4 LT |
2353 | /* I am proposing to what he should send */ |
2354 | ppp->rstate &= ~SC_DECOMP_RUN; | |
6aa20a22 | 2355 | |
1da177e4 | 2356 | break; |
6aa20a22 | 2357 | |
1da177e4 LT |
2358 | case CCP_TERMREQ: |
2359 | case CCP_TERMACK: | |
2360 | /* | |
6aa20a22 | 2361 | * CCP is going down, both directions of transmission |
1da177e4 LT |
2362 | */ |
2363 | ppp->rstate &= ~SC_DECOMP_RUN; | |
2364 | ppp->xstate &= ~SC_COMP_RUN; | |
2365 | break; | |
2366 | ||
2367 | case CCP_CONFACK: | |
2368 | if ((ppp->flags & (SC_CCP_OPEN | SC_CCP_UP)) != SC_CCP_OPEN) | |
2369 | break; | |
2370 | len = CCP_LENGTH(dp); | |
2371 | if (!pskb_may_pull(skb, len + 2)) | |
2372 | return; /* too short */ | |
2373 | dp += CCP_HDRLEN; | |
2374 | len -= CCP_HDRLEN; | |
2375 | if (len < CCP_OPT_MINLEN || len < CCP_OPT_LENGTH(dp)) | |
2376 | break; | |
2377 | if (inbound) { | |
2378 | /* we will start receiving compressed packets */ | |
cd228d54 | 2379 | if (!ppp->rc_state) |
1da177e4 LT |
2380 | break; |
2381 | if (ppp->rcomp->decomp_init(ppp->rc_state, dp, len, | |
2382 | ppp->file.index, 0, ppp->mru, ppp->debug)) { | |
2383 | ppp->rstate |= SC_DECOMP_RUN; | |
2384 | ppp->rstate &= ~(SC_DC_ERROR | SC_DC_FERROR); | |
2385 | } | |
2386 | } else { | |
2387 | /* we will soon start sending compressed packets */ | |
cd228d54 | 2388 | if (!ppp->xc_state) |
1da177e4 LT |
2389 | break; |
2390 | if (ppp->xcomp->comp_init(ppp->xc_state, dp, len, | |
2391 | ppp->file.index, 0, ppp->debug)) | |
2392 | ppp->xstate |= SC_COMP_RUN; | |
2393 | } | |
2394 | break; | |
2395 | ||
2396 | case CCP_RESETACK: | |
2397 | /* reset the [de]compressor */ | |
2398 | if ((ppp->flags & SC_CCP_UP) == 0) | |
2399 | break; | |
2400 | if (inbound) { | |
2401 | if (ppp->rc_state && (ppp->rstate & SC_DECOMP_RUN)) { | |
2402 | ppp->rcomp->decomp_reset(ppp->rc_state); | |
2403 | ppp->rstate &= ~SC_DC_ERROR; | |
2404 | } | |
2405 | } else { | |
2406 | if (ppp->xc_state && (ppp->xstate & SC_COMP_RUN)) | |
2407 | ppp->xcomp->comp_reset(ppp->xc_state); | |
2408 | } | |
2409 | break; | |
2410 | } | |
2411 | } | |
2412 | ||
2413 | /* Free up compression resources. */ | |
2414 | static void | |
2415 | ppp_ccp_closed(struct ppp *ppp) | |
2416 | { | |
2417 | void *xstate, *rstate; | |
2418 | struct compressor *xcomp, *rcomp; | |
2419 | ||
2420 | ppp_lock(ppp); | |
2421 | ppp->flags &= ~(SC_CCP_OPEN | SC_CCP_UP); | |
2422 | ppp->xstate = 0; | |
2423 | xcomp = ppp->xcomp; | |
2424 | xstate = ppp->xc_state; | |
2425 | ppp->xc_state = NULL; | |
2426 | ppp->rstate = 0; | |
2427 | rcomp = ppp->rcomp; | |
2428 | rstate = ppp->rc_state; | |
2429 | ppp->rc_state = NULL; | |
2430 | ppp_unlock(ppp); | |
2431 | ||
2432 | if (xstate) { | |
2433 | xcomp->comp_free(xstate); | |
2434 | module_put(xcomp->owner); | |
2435 | } | |
2436 | if (rstate) { | |
2437 | rcomp->decomp_free(rstate); | |
2438 | module_put(rcomp->owner); | |
2439 | } | |
2440 | } | |
2441 | ||
2442 | /* List of compressors. */ | |
2443 | static LIST_HEAD(compressor_list); | |
2444 | static DEFINE_SPINLOCK(compressor_list_lock); | |
2445 | ||
2446 | struct compressor_entry { | |
2447 | struct list_head list; | |
2448 | struct compressor *comp; | |
2449 | }; | |
2450 | ||
2451 | static struct compressor_entry * | |
2452 | find_comp_entry(int proto) | |
2453 | { | |
2454 | struct compressor_entry *ce; | |
1da177e4 | 2455 | |
81616c5a | 2456 | list_for_each_entry(ce, &compressor_list, list) { |
1da177e4 LT |
2457 | if (ce->comp->compress_proto == proto) |
2458 | return ce; | |
2459 | } | |
2460 | return NULL; | |
2461 | } | |
2462 | ||
2463 | /* Register a compressor */ | |
2464 | int | |
2465 | ppp_register_compressor(struct compressor *cp) | |
2466 | { | |
2467 | struct compressor_entry *ce; | |
2468 | int ret; | |
2469 | spin_lock(&compressor_list_lock); | |
2470 | ret = -EEXIST; | |
cd228d54 | 2471 | if (find_comp_entry(cp->compress_proto)) |
1da177e4 LT |
2472 | goto out; |
2473 | ret = -ENOMEM; | |
2474 | ce = kmalloc(sizeof(struct compressor_entry), GFP_ATOMIC); | |
cd228d54 | 2475 | if (!ce) |
1da177e4 LT |
2476 | goto out; |
2477 | ret = 0; | |
2478 | ce->comp = cp; | |
2479 | list_add(&ce->list, &compressor_list); | |
2480 | out: | |
2481 | spin_unlock(&compressor_list_lock); | |
2482 | return ret; | |
2483 | } | |
2484 | ||
2485 | /* Unregister a compressor */ | |
2486 | void | |
2487 | ppp_unregister_compressor(struct compressor *cp) | |
2488 | { | |
2489 | struct compressor_entry *ce; | |
2490 | ||
2491 | spin_lock(&compressor_list_lock); | |
2492 | ce = find_comp_entry(cp->compress_proto); | |
cd228d54 | 2493 | if (ce && ce->comp == cp) { |
1da177e4 LT |
2494 | list_del(&ce->list); |
2495 | kfree(ce); | |
2496 | } | |
2497 | spin_unlock(&compressor_list_lock); | |
2498 | } | |
2499 | ||
2500 | /* Find a compressor. */ | |
2501 | static struct compressor * | |
2502 | find_compressor(int type) | |
2503 | { | |
2504 | struct compressor_entry *ce; | |
2505 | struct compressor *cp = NULL; | |
2506 | ||
2507 | spin_lock(&compressor_list_lock); | |
2508 | ce = find_comp_entry(type); | |
cd228d54 | 2509 | if (ce) { |
1da177e4 LT |
2510 | cp = ce->comp; |
2511 | if (!try_module_get(cp->owner)) | |
2512 | cp = NULL; | |
2513 | } | |
2514 | spin_unlock(&compressor_list_lock); | |
2515 | return cp; | |
2516 | } | |
2517 | ||
2518 | /* | |
2519 | * Miscelleneous stuff. | |
2520 | */ | |
2521 | ||
2522 | static void | |
2523 | ppp_get_stats(struct ppp *ppp, struct ppp_stats *st) | |
2524 | { | |
2525 | struct slcompress *vj = ppp->vj; | |
2526 | ||
2527 | memset(st, 0, sizeof(*st)); | |
8c0469cd PZ |
2528 | st->p.ppp_ipackets = ppp->dev->stats.rx_packets; |
2529 | st->p.ppp_ierrors = ppp->dev->stats.rx_errors; | |
2530 | st->p.ppp_ibytes = ppp->dev->stats.rx_bytes; | |
2531 | st->p.ppp_opackets = ppp->dev->stats.tx_packets; | |
2532 | st->p.ppp_oerrors = ppp->dev->stats.tx_errors; | |
2533 | st->p.ppp_obytes = ppp->dev->stats.tx_bytes; | |
cd228d54 | 2534 | if (!vj) |
1da177e4 LT |
2535 | return; |
2536 | st->vj.vjs_packets = vj->sls_o_compressed + vj->sls_o_uncompressed; | |
2537 | st->vj.vjs_compressed = vj->sls_o_compressed; | |
2538 | st->vj.vjs_searches = vj->sls_o_searches; | |
2539 | st->vj.vjs_misses = vj->sls_o_misses; | |
2540 | st->vj.vjs_errorin = vj->sls_i_error; | |
2541 | st->vj.vjs_tossed = vj->sls_i_tossed; | |
2542 | st->vj.vjs_uncompressedin = vj->sls_i_uncompressed; | |
2543 | st->vj.vjs_compressedin = vj->sls_i_compressed; | |
2544 | } | |
2545 | ||
2546 | /* | |
2547 | * Stuff for handling the lists of ppp units and channels | |
2548 | * and for initialization. | |
2549 | */ | |
2550 | ||
2551 | /* | |
2552 | * Create a new ppp interface unit. Fails if it can't allocate memory | |
2553 | * or if there is already a unit with the requested number. | |
2554 | * unit == -1 means allocate a new number. | |
2555 | */ | |
2556 | static struct ppp * | |
273ec51d | 2557 | ppp_create_interface(struct net *net, int unit, int *retp) |
1da177e4 LT |
2558 | { |
2559 | struct ppp *ppp; | |
273ec51d | 2560 | struct ppp_net *pn; |
1da177e4 LT |
2561 | struct net_device *dev = NULL; |
2562 | int ret = -ENOMEM; | |
2563 | int i; | |
2564 | ||
c8019bf3 | 2565 | dev = alloc_netdev(sizeof(struct ppp), "", ppp_setup); |
1da177e4 LT |
2566 | if (!dev) |
2567 | goto out1; | |
1da177e4 | 2568 | |
273ec51d CG |
2569 | pn = ppp_pernet(net); |
2570 | ||
c8019bf3 WC |
2571 | ppp = netdev_priv(dev); |
2572 | ppp->dev = dev; | |
1da177e4 LT |
2573 | ppp->mru = PPP_MRU; |
2574 | init_ppp_file(&ppp->file, INTERFACE); | |
2575 | ppp->file.hdrlen = PPP_HDRLEN - 2; /* don't count proto bytes */ | |
2576 | for (i = 0; i < NUM_NP; ++i) | |
2577 | ppp->npmode[i] = NPMODE_PASS; | |
2578 | INIT_LIST_HEAD(&ppp->channels); | |
2579 | spin_lock_init(&ppp->rlock); | |
2580 | spin_lock_init(&ppp->wlock); | |
2581 | #ifdef CONFIG_PPP_MULTILINK | |
2582 | ppp->minseq = -1; | |
2583 | skb_queue_head_init(&ppp->mrq); | |
2584 | #endif /* CONFIG_PPP_MULTILINK */ | |
1da177e4 | 2585 | |
273ec51d CG |
2586 | /* |
2587 | * drum roll: don't forget to set | |
2588 | * the net device is belong to | |
2589 | */ | |
2590 | dev_net_set(dev, net); | |
2591 | ||
273ec51d | 2592 | mutex_lock(&pn->all_ppp_mutex); |
7a95d267 CG |
2593 | |
2594 | if (unit < 0) { | |
273ec51d | 2595 | unit = unit_get(&pn->units_idr, ppp); |
7a95d267 | 2596 | if (unit < 0) { |
bcc70bb3 | 2597 | ret = unit; |
7a95d267 CG |
2598 | goto out2; |
2599 | } | |
2600 | } else { | |
bcc70bb3 | 2601 | ret = -EEXIST; |
273ec51d | 2602 | if (unit_find(&pn->units_idr, unit)) |
7a95d267 | 2603 | goto out2; /* unit already exists */ |
85997576 CG |
2604 | /* |
2605 | * if caller need a specified unit number | |
2606 | * lets try to satisfy him, otherwise -- | |
2607 | * he should better ask us for new unit number | |
2608 | * | |
2609 | * NOTE: yes I know that returning EEXIST it's not | |
2610 | * fair but at least pppd will ask us to allocate | |
2611 | * new unit in this case so user is happy :) | |
2612 | */ | |
273ec51d | 2613 | unit = unit_set(&pn->units_idr, ppp, unit); |
85997576 | 2614 | if (unit < 0) |
7a95d267 | 2615 | goto out2; |
7a95d267 | 2616 | } |
1da177e4 LT |
2617 | |
2618 | /* Initialize the new ppp unit */ | |
2619 | ppp->file.index = unit; | |
2620 | sprintf(dev->name, "ppp%d", unit); | |
2621 | ||
2622 | ret = register_netdev(dev); | |
2623 | if (ret != 0) { | |
273ec51d | 2624 | unit_put(&pn->units_idr, unit); |
1da177e4 LT |
2625 | printk(KERN_ERR "PPP: couldn't register device %s (%d)\n", |
2626 | dev->name, ret); | |
2627 | goto out2; | |
2628 | } | |
2629 | ||
273ec51d CG |
2630 | ppp->ppp_net = net; |
2631 | ||
1da177e4 | 2632 | atomic_inc(&ppp_unit_count); |
273ec51d | 2633 | mutex_unlock(&pn->all_ppp_mutex); |
7a95d267 | 2634 | |
1da177e4 LT |
2635 | *retp = 0; |
2636 | return ppp; | |
2637 | ||
2638 | out2: | |
273ec51d | 2639 | mutex_unlock(&pn->all_ppp_mutex); |
1da177e4 LT |
2640 | free_netdev(dev); |
2641 | out1: | |
1da177e4 LT |
2642 | *retp = ret; |
2643 | return NULL; | |
2644 | } | |
2645 | ||
2646 | /* | |
2647 | * Initialize a ppp_file structure. | |
2648 | */ | |
2649 | static void | |
2650 | init_ppp_file(struct ppp_file *pf, int kind) | |
2651 | { | |
2652 | pf->kind = kind; | |
2653 | skb_queue_head_init(&pf->xq); | |
2654 | skb_queue_head_init(&pf->rq); | |
2655 | atomic_set(&pf->refcnt, 1); | |
2656 | init_waitqueue_head(&pf->rwait); | |
2657 | } | |
2658 | ||
2659 | /* | |
2660 | * Take down a ppp interface unit - called when the owning file | |
2661 | * (the one that created the unit) is closed or detached. | |
2662 | */ | |
2663 | static void ppp_shutdown_interface(struct ppp *ppp) | |
2664 | { | |
273ec51d CG |
2665 | struct ppp_net *pn; |
2666 | ||
2667 | pn = ppp_pernet(ppp->ppp_net); | |
2668 | mutex_lock(&pn->all_ppp_mutex); | |
2669 | ||
1da177e4 | 2670 | /* This will call dev_close() for us. */ |
739840d5 JC |
2671 | ppp_lock(ppp); |
2672 | if (!ppp->closing) { | |
2673 | ppp->closing = 1; | |
2674 | ppp_unlock(ppp); | |
2675 | unregister_netdev(ppp->dev); | |
bcc70bb3 | 2676 | unit_put(&pn->units_idr, ppp->file.index); |
739840d5 JC |
2677 | } else |
2678 | ppp_unlock(ppp); | |
2679 | ||
1da177e4 LT |
2680 | ppp->file.dead = 1; |
2681 | ppp->owner = NULL; | |
2682 | wake_up_interruptible(&ppp->file.rwait); | |
273ec51d CG |
2683 | |
2684 | mutex_unlock(&pn->all_ppp_mutex); | |
1da177e4 LT |
2685 | } |
2686 | ||
2687 | /* | |
2688 | * Free the memory used by a ppp unit. This is only called once | |
2689 | * there are no channels connected to the unit and no file structs | |
2690 | * that reference the unit. | |
2691 | */ | |
2692 | static void ppp_destroy_interface(struct ppp *ppp) | |
2693 | { | |
2694 | atomic_dec(&ppp_unit_count); | |
2695 | ||
2696 | if (!ppp->file.dead || ppp->n_channels) { | |
2697 | /* "can't happen" */ | |
2698 | printk(KERN_ERR "ppp: destroying ppp struct %p but dead=%d " | |
2699 | "n_channels=%d !\n", ppp, ppp->file.dead, | |
2700 | ppp->n_channels); | |
2701 | return; | |
2702 | } | |
2703 | ||
2704 | ppp_ccp_closed(ppp); | |
2705 | if (ppp->vj) { | |
2706 | slhc_free(ppp->vj); | |
2707 | ppp->vj = NULL; | |
2708 | } | |
2709 | skb_queue_purge(&ppp->file.xq); | |
2710 | skb_queue_purge(&ppp->file.rq); | |
2711 | #ifdef CONFIG_PPP_MULTILINK | |
2712 | skb_queue_purge(&ppp->mrq); | |
2713 | #endif /* CONFIG_PPP_MULTILINK */ | |
2714 | #ifdef CONFIG_PPP_FILTER | |
96edf83c JJ |
2715 | kfree(ppp->pass_filter); |
2716 | ppp->pass_filter = NULL; | |
2717 | kfree(ppp->active_filter); | |
2718 | ppp->active_filter = NULL; | |
1da177e4 LT |
2719 | #endif /* CONFIG_PPP_FILTER */ |
2720 | ||
1d2f8c95 | 2721 | kfree_skb(ppp->xmit_pending); |
165de5b7 | 2722 | |
739840d5 | 2723 | free_netdev(ppp->dev); |
1da177e4 LT |
2724 | } |
2725 | ||
2726 | /* | |
2727 | * Locate an existing ppp unit. | |
8ed965d6 | 2728 | * The caller should have locked the all_ppp_mutex. |
1da177e4 LT |
2729 | */ |
2730 | static struct ppp * | |
273ec51d | 2731 | ppp_find_unit(struct ppp_net *pn, int unit) |
1da177e4 | 2732 | { |
273ec51d | 2733 | return unit_find(&pn->units_idr, unit); |
1da177e4 LT |
2734 | } |
2735 | ||
2736 | /* | |
2737 | * Locate an existing ppp channel. | |
2738 | * The caller should have locked the all_channels_lock. | |
2739 | * First we look in the new_channels list, then in the | |
2740 | * all_channels list. If found in the new_channels list, | |
2741 | * we move it to the all_channels list. This is for speed | |
2742 | * when we have a lot of channels in use. | |
2743 | */ | |
2744 | static struct channel * | |
273ec51d | 2745 | ppp_find_channel(struct ppp_net *pn, int unit) |
1da177e4 LT |
2746 | { |
2747 | struct channel *pch; | |
1da177e4 | 2748 | |
273ec51d | 2749 | list_for_each_entry(pch, &pn->new_channels, list) { |
1da177e4 | 2750 | if (pch->file.index == unit) { |
273ec51d | 2751 | list_move(&pch->list, &pn->all_channels); |
1da177e4 LT |
2752 | return pch; |
2753 | } | |
2754 | } | |
273ec51d CG |
2755 | |
2756 | list_for_each_entry(pch, &pn->all_channels, list) { | |
1da177e4 LT |
2757 | if (pch->file.index == unit) |
2758 | return pch; | |
2759 | } | |
273ec51d | 2760 | |
1da177e4 LT |
2761 | return NULL; |
2762 | } | |
2763 | ||
2764 | /* | |
2765 | * Connect a PPP channel to a PPP interface unit. | |
2766 | */ | |
2767 | static int | |
2768 | ppp_connect_channel(struct channel *pch, int unit) | |
2769 | { | |
2770 | struct ppp *ppp; | |
273ec51d | 2771 | struct ppp_net *pn; |
1da177e4 LT |
2772 | int ret = -ENXIO; |
2773 | int hdrlen; | |
2774 | ||
273ec51d CG |
2775 | pn = ppp_pernet(pch->chan_net); |
2776 | ||
2777 | mutex_lock(&pn->all_ppp_mutex); | |
2778 | ppp = ppp_find_unit(pn, unit); | |
cd228d54 | 2779 | if (!ppp) |
1da177e4 LT |
2780 | goto out; |
2781 | write_lock_bh(&pch->upl); | |
2782 | ret = -EINVAL; | |
cd228d54 | 2783 | if (pch->ppp) |
1da177e4 LT |
2784 | goto outl; |
2785 | ||
2786 | ppp_lock(ppp); | |
2787 | if (pch->file.hdrlen > ppp->file.hdrlen) | |
2788 | ppp->file.hdrlen = pch->file.hdrlen; | |
2789 | hdrlen = pch->file.hdrlen + 2; /* for protocol bytes */ | |
739840d5 | 2790 | if (hdrlen > ppp->dev->hard_header_len) |
1da177e4 LT |
2791 | ppp->dev->hard_header_len = hdrlen; |
2792 | list_add_tail(&pch->clist, &ppp->channels); | |
2793 | ++ppp->n_channels; | |
2794 | pch->ppp = ppp; | |
2795 | atomic_inc(&ppp->file.refcnt); | |
2796 | ppp_unlock(ppp); | |
2797 | ret = 0; | |
2798 | ||
2799 | outl: | |
2800 | write_unlock_bh(&pch->upl); | |
2801 | out: | |
273ec51d | 2802 | mutex_unlock(&pn->all_ppp_mutex); |
1da177e4 LT |
2803 | return ret; |
2804 | } | |
2805 | ||
2806 | /* | |
2807 | * Disconnect a channel from its ppp unit. | |
2808 | */ | |
2809 | static int | |
2810 | ppp_disconnect_channel(struct channel *pch) | |
2811 | { | |
2812 | struct ppp *ppp; | |
2813 | int err = -EINVAL; | |
2814 | ||
2815 | write_lock_bh(&pch->upl); | |
2816 | ppp = pch->ppp; | |
2817 | pch->ppp = NULL; | |
2818 | write_unlock_bh(&pch->upl); | |
cd228d54 | 2819 | if (ppp) { |
1da177e4 LT |
2820 | /* remove it from the ppp unit's list */ |
2821 | ppp_lock(ppp); | |
2822 | list_del(&pch->clist); | |
2823 | if (--ppp->n_channels == 0) | |
2824 | wake_up_interruptible(&ppp->file.rwait); | |
2825 | ppp_unlock(ppp); | |
2826 | if (atomic_dec_and_test(&ppp->file.refcnt)) | |
2827 | ppp_destroy_interface(ppp); | |
2828 | err = 0; | |
2829 | } | |
2830 | return err; | |
2831 | } | |
2832 | ||
2833 | /* | |
2834 | * Free up the resources used by a ppp channel. | |
2835 | */ | |
2836 | static void ppp_destroy_channel(struct channel *pch) | |
2837 | { | |
2838 | atomic_dec(&channel_count); | |
2839 | ||
2840 | if (!pch->file.dead) { | |
2841 | /* "can't happen" */ | |
2842 | printk(KERN_ERR "ppp: destroying undead channel %p !\n", | |
2843 | pch); | |
2844 | return; | |
2845 | } | |
2846 | skb_queue_purge(&pch->file.xq); | |
2847 | skb_queue_purge(&pch->file.rq); | |
2848 | kfree(pch); | |
2849 | } | |
2850 | ||
2851 | static void __exit ppp_cleanup(void) | |
2852 | { | |
2853 | /* should never happen */ | |
2854 | if (atomic_read(&ppp_unit_count) || atomic_read(&channel_count)) | |
2855 | printk(KERN_ERR "PPP: removing module but units remain!\n"); | |
68fc4fab | 2856 | unregister_chrdev(PPP_MAJOR, "ppp"); |
9a6a2a5e | 2857 | device_destroy(ppp_class, MKDEV(PPP_MAJOR, 0)); |
56b22935 | 2858 | class_destroy(ppp_class); |
741a6fa2 | 2859 | unregister_pernet_device(&ppp_net_ops); |
1da177e4 LT |
2860 | } |
2861 | ||
2862 | /* | |
7a95d267 CG |
2863 | * Units handling. Caller must protect concurrent access |
2864 | * by holding all_ppp_mutex | |
1da177e4 | 2865 | */ |
7a95d267 | 2866 | |
bcc70bb3 | 2867 | static int __unit_alloc(struct idr *p, void *ptr, int n) |
85997576 CG |
2868 | { |
2869 | int unit, err; | |
2870 | ||
2871 | again: | |
2872 | if (!idr_pre_get(p, GFP_KERNEL)) { | |
2873 | printk(KERN_ERR "PPP: No free memory for idr\n"); | |
2874 | return -ENOMEM; | |
2875 | } | |
2876 | ||
2877 | err = idr_get_new_above(p, ptr, n, &unit); | |
bcc70bb3 CG |
2878 | if (err < 0) { |
2879 | if (err == -EAGAIN) | |
2880 | goto again; | |
2881 | return err; | |
2882 | } | |
2883 | ||
2884 | return unit; | |
2885 | } | |
2886 | ||
2887 | /* associate pointer with specified number */ | |
2888 | static int unit_set(struct idr *p, void *ptr, int n) | |
2889 | { | |
2890 | int unit; | |
85997576 | 2891 | |
bcc70bb3 CG |
2892 | unit = __unit_alloc(p, ptr, n); |
2893 | if (unit < 0) | |
2894 | return unit; | |
2895 | else if (unit != n) { | |
85997576 CG |
2896 | idr_remove(p, unit); |
2897 | return -EINVAL; | |
2898 | } | |
2899 | ||
2900 | return unit; | |
2901 | } | |
2902 | ||
7a95d267 CG |
2903 | /* get new free unit number and associate pointer with it */ |
2904 | static int unit_get(struct idr *p, void *ptr) | |
1da177e4 | 2905 | { |
bcc70bb3 | 2906 | return __unit_alloc(p, ptr, 0); |
1da177e4 LT |
2907 | } |
2908 | ||
7a95d267 CG |
2909 | /* put unit number back to a pool */ |
2910 | static void unit_put(struct idr *p, int n) | |
1da177e4 | 2911 | { |
7a95d267 | 2912 | idr_remove(p, n); |
1da177e4 LT |
2913 | } |
2914 | ||
7a95d267 CG |
2915 | /* get pointer associated with the number */ |
2916 | static void *unit_find(struct idr *p, int n) | |
1da177e4 | 2917 | { |
7a95d267 | 2918 | return idr_find(p, n); |
1da177e4 LT |
2919 | } |
2920 | ||
2921 | /* Module/initialization stuff */ | |
2922 | ||
2923 | module_init(ppp_init); | |
2924 | module_exit(ppp_cleanup); | |
2925 | ||
273ec51d | 2926 | EXPORT_SYMBOL(ppp_register_net_channel); |
1da177e4 LT |
2927 | EXPORT_SYMBOL(ppp_register_channel); |
2928 | EXPORT_SYMBOL(ppp_unregister_channel); | |
2929 | EXPORT_SYMBOL(ppp_channel_index); | |
2930 | EXPORT_SYMBOL(ppp_unit_number); | |
63f96072 | 2931 | EXPORT_SYMBOL(ppp_dev_name); |
1da177e4 LT |
2932 | EXPORT_SYMBOL(ppp_input); |
2933 | EXPORT_SYMBOL(ppp_input_error); | |
2934 | EXPORT_SYMBOL(ppp_output_wakeup); | |
2935 | EXPORT_SYMBOL(ppp_register_compressor); | |
2936 | EXPORT_SYMBOL(ppp_unregister_compressor); | |
2937 | MODULE_LICENSE("GPL"); | |
578454ff KS |
2938 | MODULE_ALIAS_CHARDEV(PPP_MAJOR, 0); |
2939 | MODULE_ALIAS("devname:ppp"); |