Commit | Line | Data |
---|---|---|
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> | |
f2b9857e | 43 | #include <linux/smp_lock.h> |
1da177e4 | 44 | #include <linux/spinlock.h> |
1da177e4 LT |
45 | #include <linux/rwsem.h> |
46 | #include <linux/stddef.h> | |
47 | #include <linux/device.h> | |
8ed965d6 | 48 | #include <linux/mutex.h> |
5a0e3ad6 | 49 | #include <linux/slab.h> |
1da177e4 LT |
50 | #include <net/slhc_vj.h> |
51 | #include <asm/atomic.h> | |
52 | ||
273ec51d CG |
53 | #include <linux/nsproxy.h> |
54 | #include <net/net_namespace.h> | |
55 | #include <net/netns/generic.h> | |
56 | ||
1da177e4 LT |
57 | #define PPP_VERSION "2.4.2" |
58 | ||
59 | /* | |
60 | * Network protocols we support. | |
61 | */ | |
62 | #define NP_IP 0 /* Internet Protocol V4 */ | |
63 | #define NP_IPV6 1 /* Internet Protocol V6 */ | |
64 | #define NP_IPX 2 /* IPX protocol */ | |
65 | #define NP_AT 3 /* Appletalk protocol */ | |
66 | #define NP_MPLS_UC 4 /* MPLS unicast */ | |
67 | #define NP_MPLS_MC 5 /* MPLS multicast */ | |
68 | #define NUM_NP 6 /* Number of NPs. */ | |
69 | ||
70 | #define MPHDRLEN 6 /* multilink protocol header length */ | |
71 | #define MPHDRLEN_SSN 4 /* ditto with short sequence numbers */ | |
72 | #define MIN_FRAG_SIZE 64 | |
73 | ||
74 | /* | |
75 | * An instance of /dev/ppp can be associated with either a ppp | |
76 | * interface unit or a ppp channel. In both cases, file->private_data | |
77 | * points to one of these. | |
78 | */ | |
79 | struct ppp_file { | |
80 | enum { | |
81 | INTERFACE=1, CHANNEL | |
82 | } kind; | |
83 | struct sk_buff_head xq; /* pppd transmit queue */ | |
84 | struct sk_buff_head rq; /* receive queue for pppd */ | |
85 | wait_queue_head_t rwait; /* for poll on reading /dev/ppp */ | |
86 | atomic_t refcnt; /* # refs (incl /dev/ppp attached) */ | |
87 | int hdrlen; /* space to leave for headers */ | |
88 | int index; /* interface unit / channel number */ | |
89 | int dead; /* unit/channel has been shut down */ | |
90 | }; | |
91 | ||
b385a144 | 92 | #define PF_TO_X(pf, X) container_of(pf, X, file) |
1da177e4 LT |
93 | |
94 | #define PF_TO_PPP(pf) PF_TO_X(pf, struct ppp) | |
95 | #define PF_TO_CHANNEL(pf) PF_TO_X(pf, struct channel) | |
96 | ||
1da177e4 LT |
97 | /* |
98 | * Data structure describing one ppp unit. | |
99 | * A ppp unit corresponds to a ppp network interface device | |
100 | * and represents a multilink bundle. | |
101 | * It can have 0 or more ppp channels connected to it. | |
102 | */ | |
103 | struct ppp { | |
104 | struct ppp_file file; /* stuff for read/write/poll 0 */ | |
105 | struct file *owner; /* file that owns this unit 48 */ | |
106 | struct list_head channels; /* list of attached channels 4c */ | |
107 | int n_channels; /* how many channels are attached 54 */ | |
108 | spinlock_t rlock; /* lock for receive side 58 */ | |
109 | spinlock_t wlock; /* lock for transmit side 5c */ | |
110 | int mru; /* max receive unit 60 */ | |
111 | unsigned int flags; /* control bits 64 */ | |
112 | unsigned int xstate; /* transmit state bits 68 */ | |
113 | unsigned int rstate; /* receive state bits 6c */ | |
114 | int debug; /* debug flags 70 */ | |
115 | struct slcompress *vj; /* state for VJ header compression */ | |
116 | enum NPmode npmode[NUM_NP]; /* what to do with each net proto 78 */ | |
117 | struct sk_buff *xmit_pending; /* a packet ready to go out 88 */ | |
118 | struct compressor *xcomp; /* transmit packet compressor 8c */ | |
119 | void *xc_state; /* its internal state 90 */ | |
120 | struct compressor *rcomp; /* receive decompressor 94 */ | |
121 | void *rc_state; /* its internal state 98 */ | |
122 | unsigned long last_xmit; /* jiffies when last pkt sent 9c */ | |
123 | unsigned long last_recv; /* jiffies when last pkt rcvd a0 */ | |
124 | struct net_device *dev; /* network interface device a4 */ | |
739840d5 | 125 | int closing; /* is device closing down? a8 */ |
1da177e4 LT |
126 | #ifdef CONFIG_PPP_MULTILINK |
127 | int nxchan; /* next channel to send something on */ | |
128 | u32 nxseq; /* next sequence number to send */ | |
129 | int mrru; /* MP: max reconst. receive unit */ | |
130 | u32 nextseq; /* MP: seq no of next packet */ | |
131 | u32 minseq; /* MP: min of most recent seqnos */ | |
132 | struct sk_buff_head mrq; /* MP: receive reconstruction queue */ | |
133 | #endif /* CONFIG_PPP_MULTILINK */ | |
1da177e4 LT |
134 | #ifdef CONFIG_PPP_FILTER |
135 | struct sock_filter *pass_filter; /* filter for packets to pass */ | |
136 | struct sock_filter *active_filter;/* filter for pkts to reset idle */ | |
137 | unsigned pass_len, active_len; | |
138 | #endif /* CONFIG_PPP_FILTER */ | |
273ec51d | 139 | struct net *ppp_net; /* the net we belong to */ |
1da177e4 LT |
140 | }; |
141 | ||
142 | /* | |
143 | * Bits in flags: SC_NO_TCP_CCID, SC_CCP_OPEN, SC_CCP_UP, SC_LOOP_TRAFFIC, | |
b3f9b92a MD |
144 | * SC_MULTILINK, SC_MP_SHORTSEQ, SC_MP_XSHORTSEQ, SC_COMP_TCP, SC_REJ_COMP_TCP, |
145 | * SC_MUST_COMP | |
1da177e4 LT |
146 | * Bits in rstate: SC_DECOMP_RUN, SC_DC_ERROR, SC_DC_FERROR. |
147 | * Bits in xstate: SC_COMP_RUN | |
148 | */ | |
149 | #define SC_FLAG_BITS (SC_NO_TCP_CCID|SC_CCP_OPEN|SC_CCP_UP|SC_LOOP_TRAFFIC \ | |
150 | |SC_MULTILINK|SC_MP_SHORTSEQ|SC_MP_XSHORTSEQ \ | |
b3f9b92a | 151 | |SC_COMP_TCP|SC_REJ_COMP_TCP|SC_MUST_COMP) |
1da177e4 LT |
152 | |
153 | /* | |
154 | * Private data structure for each channel. | |
155 | * This includes the data structure used for multilink. | |
156 | */ | |
157 | struct channel { | |
158 | struct ppp_file file; /* stuff for read/write/poll */ | |
159 | struct list_head list; /* link in all/new_channels list */ | |
160 | struct ppp_channel *chan; /* public channel data structure */ | |
161 | struct rw_semaphore chan_sem; /* protects `chan' during chan ioctl */ | |
162 | spinlock_t downl; /* protects `chan', file.xq dequeue */ | |
163 | struct ppp *ppp; /* ppp unit we're connected to */ | |
273ec51d | 164 | struct net *chan_net; /* the net channel belongs to */ |
1da177e4 LT |
165 | struct list_head clist; /* link in list of channels per unit */ |
166 | rwlock_t upl; /* protects `ppp' */ | |
167 | #ifdef CONFIG_PPP_MULTILINK | |
168 | u8 avail; /* flag used in multilink stuff */ | |
169 | u8 had_frag; /* >= 1 fragments have been sent */ | |
170 | u32 lastseq; /* MP: last sequence # received */ | |
fa44a73c | 171 | int speed; /* speed of the corresponding ppp channel*/ |
1da177e4 LT |
172 | #endif /* CONFIG_PPP_MULTILINK */ |
173 | }; | |
174 | ||
175 | /* | |
176 | * SMP locking issues: | |
177 | * Both the ppp.rlock and ppp.wlock locks protect the ppp.channels | |
178 | * list and the ppp.n_channels field, you need to take both locks | |
179 | * before you modify them. | |
180 | * The lock ordering is: channel.upl -> ppp.wlock -> ppp.rlock -> | |
181 | * channel.downl. | |
182 | */ | |
183 | ||
1da177e4 | 184 | static atomic_t ppp_unit_count = ATOMIC_INIT(0); |
1da177e4 LT |
185 | static atomic_t channel_count = ATOMIC_INIT(0); |
186 | ||
273ec51d | 187 | /* per-net private data for this module */ |
f99189b1 | 188 | static int ppp_net_id __read_mostly; |
273ec51d CG |
189 | struct ppp_net { |
190 | /* units to ppp mapping */ | |
191 | struct idr units_idr; | |
192 | ||
193 | /* | |
194 | * all_ppp_mutex protects the units_idr mapping. | |
195 | * It also ensures that finding a ppp unit in the units_idr | |
196 | * map and updating its file.refcnt field is atomic. | |
197 | */ | |
198 | struct mutex all_ppp_mutex; | |
199 | ||
200 | /* channels */ | |
201 | struct list_head all_channels; | |
202 | struct list_head new_channels; | |
203 | int last_channel_index; | |
204 | ||
205 | /* | |
206 | * all_channels_lock protects all_channels and | |
207 | * last_channel_index, and the atomicity of find | |
208 | * a channel and updating its file.refcnt field. | |
209 | */ | |
210 | spinlock_t all_channels_lock; | |
211 | }; | |
212 | ||
1da177e4 LT |
213 | /* Get the PPP protocol number from a skb */ |
214 | #define PPP_PROTO(skb) (((skb)->data[0] << 8) + (skb)->data[1]) | |
215 | ||
216 | /* We limit the length of ppp->file.rq to this (arbitrary) value */ | |
217 | #define PPP_MAX_RQLEN 32 | |
218 | ||
219 | /* | |
220 | * Maximum number of multilink fragments queued up. | |
221 | * This has to be large enough to cope with the maximum latency of | |
222 | * the slowest channel relative to the others. Strictly it should | |
223 | * depend on the number of channels and their characteristics. | |
224 | */ | |
225 | #define PPP_MP_MAX_QLEN 128 | |
226 | ||
227 | /* Multilink header bits. */ | |
228 | #define B 0x80 /* this fragment begins a packet */ | |
229 | #define E 0x40 /* this fragment ends a packet */ | |
230 | ||
231 | /* Compare multilink sequence numbers (assumed to be 32 bits wide) */ | |
232 | #define seq_before(a, b) ((s32)((a) - (b)) < 0) | |
233 | #define seq_after(a, b) ((s32)((a) - (b)) > 0) | |
234 | ||
235 | /* Prototypes. */ | |
273ec51d CG |
236 | static int ppp_unattached_ioctl(struct net *net, struct ppp_file *pf, |
237 | struct file *file, unsigned int cmd, unsigned long arg); | |
1da177e4 LT |
238 | static void ppp_xmit_process(struct ppp *ppp); |
239 | static void ppp_send_frame(struct ppp *ppp, struct sk_buff *skb); | |
240 | static void ppp_push(struct ppp *ppp); | |
241 | static void ppp_channel_push(struct channel *pch); | |
242 | static void ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, | |
243 | struct channel *pch); | |
244 | static void ppp_receive_error(struct ppp *ppp); | |
245 | static void ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb); | |
246 | static struct sk_buff *ppp_decompress_frame(struct ppp *ppp, | |
247 | struct sk_buff *skb); | |
248 | #ifdef CONFIG_PPP_MULTILINK | |
249 | static void ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, | |
250 | struct channel *pch); | |
251 | static void ppp_mp_insert(struct ppp *ppp, struct sk_buff *skb); | |
252 | static struct sk_buff *ppp_mp_reconstruct(struct ppp *ppp); | |
253 | static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb); | |
254 | #endif /* CONFIG_PPP_MULTILINK */ | |
255 | static int ppp_set_compress(struct ppp *ppp, unsigned long arg); | |
256 | static void ppp_ccp_peek(struct ppp *ppp, struct sk_buff *skb, int inbound); | |
257 | static void ppp_ccp_closed(struct ppp *ppp); | |
258 | static struct compressor *find_compressor(int type); | |
259 | static void ppp_get_stats(struct ppp *ppp, struct ppp_stats *st); | |
273ec51d | 260 | static struct ppp *ppp_create_interface(struct net *net, int unit, int *retp); |
1da177e4 LT |
261 | static void init_ppp_file(struct ppp_file *pf, int kind); |
262 | static void ppp_shutdown_interface(struct ppp *ppp); | |
263 | static void ppp_destroy_interface(struct ppp *ppp); | |
273ec51d CG |
264 | static struct ppp *ppp_find_unit(struct ppp_net *pn, int unit); |
265 | static struct channel *ppp_find_channel(struct ppp_net *pn, int unit); | |
1da177e4 LT |
266 | static int ppp_connect_channel(struct channel *pch, int unit); |
267 | static int ppp_disconnect_channel(struct channel *pch); | |
268 | static void ppp_destroy_channel(struct channel *pch); | |
7a95d267 | 269 | static int unit_get(struct idr *p, void *ptr); |
85997576 | 270 | static int unit_set(struct idr *p, void *ptr, int n); |
7a95d267 CG |
271 | static void unit_put(struct idr *p, int n); |
272 | static void *unit_find(struct idr *p, int n); | |
1da177e4 | 273 | |
56b22935 | 274 | static struct class *ppp_class; |
1da177e4 | 275 | |
273ec51d CG |
276 | /* per net-namespace data */ |
277 | static inline struct ppp_net *ppp_pernet(struct net *net) | |
278 | { | |
279 | BUG_ON(!net); | |
280 | ||
281 | return net_generic(net, ppp_net_id); | |
282 | } | |
283 | ||
1da177e4 LT |
284 | /* Translates a PPP protocol number to a NP index (NP == network protocol) */ |
285 | static inline int proto_to_npindex(int proto) | |
286 | { | |
287 | switch (proto) { | |
288 | case PPP_IP: | |
289 | return NP_IP; | |
290 | case PPP_IPV6: | |
291 | return NP_IPV6; | |
292 | case PPP_IPX: | |
293 | return NP_IPX; | |
294 | case PPP_AT: | |
295 | return NP_AT; | |
296 | case PPP_MPLS_UC: | |
297 | return NP_MPLS_UC; | |
298 | case PPP_MPLS_MC: | |
299 | return NP_MPLS_MC; | |
300 | } | |
301 | return -EINVAL; | |
302 | } | |
303 | ||
304 | /* Translates an NP index into a PPP protocol number */ | |
305 | static const int npindex_to_proto[NUM_NP] = { | |
306 | PPP_IP, | |
307 | PPP_IPV6, | |
308 | PPP_IPX, | |
309 | PPP_AT, | |
310 | PPP_MPLS_UC, | |
311 | PPP_MPLS_MC, | |
312 | }; | |
6aa20a22 | 313 | |
1da177e4 LT |
314 | /* Translates an ethertype into an NP index */ |
315 | static inline int ethertype_to_npindex(int ethertype) | |
316 | { | |
317 | switch (ethertype) { | |
318 | case ETH_P_IP: | |
319 | return NP_IP; | |
320 | case ETH_P_IPV6: | |
321 | return NP_IPV6; | |
322 | case ETH_P_IPX: | |
323 | return NP_IPX; | |
324 | case ETH_P_PPPTALK: | |
325 | case ETH_P_ATALK: | |
326 | return NP_AT; | |
327 | case ETH_P_MPLS_UC: | |
328 | return NP_MPLS_UC; | |
329 | case ETH_P_MPLS_MC: | |
330 | return NP_MPLS_MC; | |
331 | } | |
332 | return -1; | |
333 | } | |
334 | ||
335 | /* Translates an NP index into an ethertype */ | |
336 | static const int npindex_to_ethertype[NUM_NP] = { | |
337 | ETH_P_IP, | |
338 | ETH_P_IPV6, | |
339 | ETH_P_IPX, | |
340 | ETH_P_PPPTALK, | |
341 | ETH_P_MPLS_UC, | |
342 | ETH_P_MPLS_MC, | |
343 | }; | |
344 | ||
345 | /* | |
346 | * Locking shorthand. | |
347 | */ | |
348 | #define ppp_xmit_lock(ppp) spin_lock_bh(&(ppp)->wlock) | |
349 | #define ppp_xmit_unlock(ppp) spin_unlock_bh(&(ppp)->wlock) | |
350 | #define ppp_recv_lock(ppp) spin_lock_bh(&(ppp)->rlock) | |
351 | #define ppp_recv_unlock(ppp) spin_unlock_bh(&(ppp)->rlock) | |
352 | #define ppp_lock(ppp) do { ppp_xmit_lock(ppp); \ | |
353 | ppp_recv_lock(ppp); } while (0) | |
354 | #define ppp_unlock(ppp) do { ppp_recv_unlock(ppp); \ | |
355 | ppp_xmit_unlock(ppp); } while (0) | |
356 | ||
357 | /* | |
358 | * /dev/ppp device routines. | |
359 | * The /dev/ppp device is used by pppd to control the ppp unit. | |
360 | * It supports the read, write, ioctl and poll functions. | |
361 | * Open instances of /dev/ppp can be in one of three states: | |
362 | * unattached, attached to a ppp unit, or attached to a ppp channel. | |
363 | */ | |
364 | static int ppp_open(struct inode *inode, struct file *file) | |
365 | { | |
f2b9857e | 366 | cycle_kernel_lock(); |
1da177e4 LT |
367 | /* |
368 | * This could (should?) be enforced by the permissions on /dev/ppp. | |
369 | */ | |
370 | if (!capable(CAP_NET_ADMIN)) | |
371 | return -EPERM; | |
372 | return 0; | |
373 | } | |
374 | ||
f3ff8a4d | 375 | static int ppp_release(struct inode *unused, struct file *file) |
1da177e4 LT |
376 | { |
377 | struct ppp_file *pf = file->private_data; | |
378 | struct ppp *ppp; | |
379 | ||
cd228d54 | 380 | if (pf) { |
1da177e4 LT |
381 | file->private_data = NULL; |
382 | if (pf->kind == INTERFACE) { | |
383 | ppp = PF_TO_PPP(pf); | |
384 | if (file == ppp->owner) | |
385 | ppp_shutdown_interface(ppp); | |
386 | } | |
387 | if (atomic_dec_and_test(&pf->refcnt)) { | |
388 | switch (pf->kind) { | |
389 | case INTERFACE: | |
390 | ppp_destroy_interface(PF_TO_PPP(pf)); | |
391 | break; | |
392 | case CHANNEL: | |
393 | ppp_destroy_channel(PF_TO_CHANNEL(pf)); | |
394 | break; | |
395 | } | |
396 | } | |
397 | } | |
398 | return 0; | |
399 | } | |
400 | ||
401 | static ssize_t ppp_read(struct file *file, char __user *buf, | |
402 | size_t count, loff_t *ppos) | |
403 | { | |
404 | struct ppp_file *pf = file->private_data; | |
405 | DECLARE_WAITQUEUE(wait, current); | |
406 | ssize_t ret; | |
407 | struct sk_buff *skb = NULL; | |
19937d04 | 408 | struct iovec iov; |
1da177e4 LT |
409 | |
410 | ret = count; | |
411 | ||
cd228d54 | 412 | if (!pf) |
1da177e4 LT |
413 | return -ENXIO; |
414 | add_wait_queue(&pf->rwait, &wait); | |
415 | for (;;) { | |
416 | set_current_state(TASK_INTERRUPTIBLE); | |
417 | skb = skb_dequeue(&pf->rq); | |
418 | if (skb) | |
419 | break; | |
420 | ret = 0; | |
421 | if (pf->dead) | |
422 | break; | |
423 | if (pf->kind == INTERFACE) { | |
424 | /* | |
425 | * Return 0 (EOF) on an interface that has no | |
426 | * channels connected, unless it is looping | |
427 | * network traffic (demand mode). | |
428 | */ | |
429 | struct ppp *ppp = PF_TO_PPP(pf); | |
8e95a202 JP |
430 | if (ppp->n_channels == 0 && |
431 | (ppp->flags & SC_LOOP_TRAFFIC) == 0) | |
1da177e4 LT |
432 | break; |
433 | } | |
434 | ret = -EAGAIN; | |
435 | if (file->f_flags & O_NONBLOCK) | |
436 | break; | |
437 | ret = -ERESTARTSYS; | |
438 | if (signal_pending(current)) | |
439 | break; | |
440 | schedule(); | |
441 | } | |
442 | set_current_state(TASK_RUNNING); | |
443 | remove_wait_queue(&pf->rwait, &wait); | |
444 | ||
cd228d54 | 445 | if (!skb) |
1da177e4 LT |
446 | goto out; |
447 | ||
448 | ret = -EOVERFLOW; | |
449 | if (skb->len > count) | |
450 | goto outf; | |
451 | ret = -EFAULT; | |
19937d04 SA |
452 | iov.iov_base = buf; |
453 | iov.iov_len = count; | |
454 | if (skb_copy_datagram_iovec(skb, 0, &iov, skb->len)) | |
1da177e4 LT |
455 | goto outf; |
456 | ret = skb->len; | |
457 | ||
458 | outf: | |
459 | kfree_skb(skb); | |
460 | out: | |
461 | return ret; | |
462 | } | |
463 | ||
464 | static ssize_t ppp_write(struct file *file, const char __user *buf, | |
465 | size_t count, loff_t *ppos) | |
466 | { | |
467 | struct ppp_file *pf = file->private_data; | |
468 | struct sk_buff *skb; | |
469 | ssize_t ret; | |
470 | ||
cd228d54 | 471 | if (!pf) |
1da177e4 LT |
472 | return -ENXIO; |
473 | ret = -ENOMEM; | |
474 | skb = alloc_skb(count + pf->hdrlen, GFP_KERNEL); | |
cd228d54 | 475 | if (!skb) |
1da177e4 LT |
476 | goto out; |
477 | skb_reserve(skb, pf->hdrlen); | |
478 | ret = -EFAULT; | |
479 | if (copy_from_user(skb_put(skb, count), buf, count)) { | |
480 | kfree_skb(skb); | |
481 | goto out; | |
482 | } | |
483 | ||
484 | skb_queue_tail(&pf->xq, skb); | |
485 | ||
486 | switch (pf->kind) { | |
487 | case INTERFACE: | |
488 | ppp_xmit_process(PF_TO_PPP(pf)); | |
489 | break; | |
490 | case CHANNEL: | |
491 | ppp_channel_push(PF_TO_CHANNEL(pf)); | |
492 | break; | |
493 | } | |
494 | ||
495 | ret = count; | |
496 | ||
497 | out: | |
498 | return ret; | |
499 | } | |
500 | ||
501 | /* No kernel lock - fine */ | |
502 | static unsigned int ppp_poll(struct file *file, poll_table *wait) | |
503 | { | |
504 | struct ppp_file *pf = file->private_data; | |
505 | unsigned int mask; | |
506 | ||
cd228d54 | 507 | if (!pf) |
1da177e4 LT |
508 | return 0; |
509 | poll_wait(file, &pf->rwait, wait); | |
510 | mask = POLLOUT | POLLWRNORM; | |
cd228d54 | 511 | if (skb_peek(&pf->rq)) |
1da177e4 LT |
512 | mask |= POLLIN | POLLRDNORM; |
513 | if (pf->dead) | |
514 | mask |= POLLHUP; | |
515 | else if (pf->kind == INTERFACE) { | |
516 | /* see comment in ppp_read */ | |
517 | struct ppp *ppp = PF_TO_PPP(pf); | |
8e95a202 JP |
518 | if (ppp->n_channels == 0 && |
519 | (ppp->flags & SC_LOOP_TRAFFIC) == 0) | |
1da177e4 LT |
520 | mask |= POLLIN | POLLRDNORM; |
521 | } | |
522 | ||
523 | return mask; | |
524 | } | |
525 | ||
526 | #ifdef CONFIG_PPP_FILTER | |
527 | static int get_filter(void __user *arg, struct sock_filter **p) | |
528 | { | |
529 | struct sock_fprog uprog; | |
530 | struct sock_filter *code = NULL; | |
531 | int len, err; | |
532 | ||
533 | if (copy_from_user(&uprog, arg, sizeof(uprog))) | |
534 | return -EFAULT; | |
535 | ||
1da177e4 LT |
536 | if (!uprog.len) { |
537 | *p = NULL; | |
538 | return 0; | |
539 | } | |
540 | ||
541 | len = uprog.len * sizeof(struct sock_filter); | |
542 | code = kmalloc(len, GFP_KERNEL); | |
543 | if (code == NULL) | |
544 | return -ENOMEM; | |
545 | ||
546 | if (copy_from_user(code, uprog.filter, len)) { | |
547 | kfree(code); | |
548 | return -EFAULT; | |
549 | } | |
550 | ||
551 | err = sk_chk_filter(code, uprog.len); | |
552 | if (err) { | |
553 | kfree(code); | |
554 | return err; | |
555 | } | |
556 | ||
557 | *p = code; | |
558 | return uprog.len; | |
559 | } | |
560 | #endif /* CONFIG_PPP_FILTER */ | |
561 | ||
f3ff8a4d | 562 | static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
563 | { |
564 | struct ppp_file *pf = file->private_data; | |
565 | struct ppp *ppp; | |
566 | int err = -EFAULT, val, val2, i; | |
567 | struct ppp_idle idle; | |
568 | struct npioctl npi; | |
569 | int unit, cflags; | |
570 | struct slcompress *vj; | |
571 | void __user *argp = (void __user *)arg; | |
572 | int __user *p = argp; | |
573 | ||
cd228d54 | 574 | if (!pf) |
273ec51d CG |
575 | return ppp_unattached_ioctl(current->nsproxy->net_ns, |
576 | pf, file, cmd, arg); | |
1da177e4 LT |
577 | |
578 | if (cmd == PPPIOCDETACH) { | |
579 | /* | |
580 | * We have to be careful here... if the file descriptor | |
581 | * has been dup'd, we could have another process in the | |
582 | * middle of a poll using the same file *, so we had | |
583 | * better not free the interface data structures - | |
584 | * instead we fail the ioctl. Even in this case, we | |
585 | * shut down the interface if we are the owner of it. | |
586 | * Actually, we should get rid of PPPIOCDETACH, userland | |
587 | * (i.e. pppd) could achieve the same effect by closing | |
588 | * this fd and reopening /dev/ppp. | |
589 | */ | |
590 | err = -EINVAL; | |
f3ff8a4d | 591 | lock_kernel(); |
1da177e4 LT |
592 | if (pf->kind == INTERFACE) { |
593 | ppp = PF_TO_PPP(pf); | |
594 | if (file == ppp->owner) | |
595 | ppp_shutdown_interface(ppp); | |
596 | } | |
516e0cc5 | 597 | if (atomic_long_read(&file->f_count) <= 2) { |
f3ff8a4d | 598 | ppp_release(NULL, file); |
1da177e4 LT |
599 | err = 0; |
600 | } else | |
516e0cc5 AV |
601 | printk(KERN_DEBUG "PPPIOCDETACH file->f_count=%ld\n", |
602 | atomic_long_read(&file->f_count)); | |
f3ff8a4d | 603 | unlock_kernel(); |
1da177e4 LT |
604 | return err; |
605 | } | |
606 | ||
607 | if (pf->kind == CHANNEL) { | |
f3ff8a4d | 608 | struct channel *pch; |
1da177e4 LT |
609 | struct ppp_channel *chan; |
610 | ||
f3ff8a4d AC |
611 | lock_kernel(); |
612 | pch = PF_TO_CHANNEL(pf); | |
613 | ||
1da177e4 LT |
614 | switch (cmd) { |
615 | case PPPIOCCONNECT: | |
616 | if (get_user(unit, p)) | |
617 | break; | |
618 | err = ppp_connect_channel(pch, unit); | |
619 | break; | |
620 | ||
621 | case PPPIOCDISCONN: | |
622 | err = ppp_disconnect_channel(pch); | |
623 | break; | |
624 | ||
625 | default: | |
626 | down_read(&pch->chan_sem); | |
627 | chan = pch->chan; | |
628 | err = -ENOTTY; | |
629 | if (chan && chan->ops->ioctl) | |
630 | err = chan->ops->ioctl(chan, cmd, arg); | |
631 | up_read(&pch->chan_sem); | |
632 | } | |
f3ff8a4d | 633 | unlock_kernel(); |
1da177e4 LT |
634 | return err; |
635 | } | |
636 | ||
637 | if (pf->kind != INTERFACE) { | |
638 | /* can't happen */ | |
639 | printk(KERN_ERR "PPP: not interface or channel??\n"); | |
640 | return -EINVAL; | |
641 | } | |
642 | ||
f3ff8a4d | 643 | lock_kernel(); |
1da177e4 LT |
644 | ppp = PF_TO_PPP(pf); |
645 | switch (cmd) { | |
646 | case PPPIOCSMRU: | |
647 | if (get_user(val, p)) | |
648 | break; | |
649 | ppp->mru = val; | |
650 | err = 0; | |
651 | break; | |
652 | ||
653 | case PPPIOCSFLAGS: | |
654 | if (get_user(val, p)) | |
655 | break; | |
656 | ppp_lock(ppp); | |
657 | cflags = ppp->flags & ~val; | |
658 | ppp->flags = val & SC_FLAG_BITS; | |
659 | ppp_unlock(ppp); | |
660 | if (cflags & SC_CCP_OPEN) | |
661 | ppp_ccp_closed(ppp); | |
662 | err = 0; | |
663 | break; | |
664 | ||
665 | case PPPIOCGFLAGS: | |
666 | val = ppp->flags | ppp->xstate | ppp->rstate; | |
667 | if (put_user(val, p)) | |
668 | break; | |
669 | err = 0; | |
670 | break; | |
671 | ||
672 | case PPPIOCSCOMPRESS: | |
673 | err = ppp_set_compress(ppp, arg); | |
674 | break; | |
675 | ||
676 | case PPPIOCGUNIT: | |
677 | if (put_user(ppp->file.index, p)) | |
678 | break; | |
679 | err = 0; | |
680 | break; | |
681 | ||
682 | case PPPIOCSDEBUG: | |
683 | if (get_user(val, p)) | |
684 | break; | |
685 | ppp->debug = val; | |
686 | err = 0; | |
687 | break; | |
688 | ||
689 | case PPPIOCGDEBUG: | |
690 | if (put_user(ppp->debug, p)) | |
691 | break; | |
692 | err = 0; | |
693 | break; | |
694 | ||
695 | case PPPIOCGIDLE: | |
696 | idle.xmit_idle = (jiffies - ppp->last_xmit) / HZ; | |
697 | idle.recv_idle = (jiffies - ppp->last_recv) / HZ; | |
698 | if (copy_to_user(argp, &idle, sizeof(idle))) | |
699 | break; | |
700 | err = 0; | |
701 | break; | |
702 | ||
703 | case PPPIOCSMAXCID: | |
704 | if (get_user(val, p)) | |
705 | break; | |
706 | val2 = 15; | |
707 | if ((val >> 16) != 0) { | |
708 | val2 = val >> 16; | |
709 | val &= 0xffff; | |
710 | } | |
711 | vj = slhc_init(val2+1, val+1); | |
cd228d54 | 712 | if (!vj) { |
1da177e4 LT |
713 | printk(KERN_ERR "PPP: no memory (VJ compressor)\n"); |
714 | err = -ENOMEM; | |
715 | break; | |
716 | } | |
717 | ppp_lock(ppp); | |
cd228d54 | 718 | if (ppp->vj) |
1da177e4 LT |
719 | slhc_free(ppp->vj); |
720 | ppp->vj = vj; | |
721 | ppp_unlock(ppp); | |
722 | err = 0; | |
723 | break; | |
724 | ||
725 | case PPPIOCGNPMODE: | |
726 | case PPPIOCSNPMODE: | |
727 | if (copy_from_user(&npi, argp, sizeof(npi))) | |
728 | break; | |
729 | err = proto_to_npindex(npi.protocol); | |
730 | if (err < 0) | |
731 | break; | |
732 | i = err; | |
733 | if (cmd == PPPIOCGNPMODE) { | |
734 | err = -EFAULT; | |
735 | npi.mode = ppp->npmode[i]; | |
736 | if (copy_to_user(argp, &npi, sizeof(npi))) | |
737 | break; | |
738 | } else { | |
739 | ppp->npmode[i] = npi.mode; | |
740 | /* we may be able to transmit more packets now (??) */ | |
741 | netif_wake_queue(ppp->dev); | |
742 | } | |
743 | err = 0; | |
744 | break; | |
745 | ||
746 | #ifdef CONFIG_PPP_FILTER | |
747 | case PPPIOCSPASS: | |
748 | { | |
749 | struct sock_filter *code; | |
750 | err = get_filter(argp, &code); | |
751 | if (err >= 0) { | |
752 | ppp_lock(ppp); | |
753 | kfree(ppp->pass_filter); | |
754 | ppp->pass_filter = code; | |
755 | ppp->pass_len = err; | |
756 | ppp_unlock(ppp); | |
757 | err = 0; | |
758 | } | |
759 | break; | |
760 | } | |
761 | case PPPIOCSACTIVE: | |
762 | { | |
763 | struct sock_filter *code; | |
764 | err = get_filter(argp, &code); | |
765 | if (err >= 0) { | |
766 | ppp_lock(ppp); | |
767 | kfree(ppp->active_filter); | |
768 | ppp->active_filter = code; | |
769 | ppp->active_len = err; | |
770 | ppp_unlock(ppp); | |
771 | err = 0; | |
772 | } | |
773 | break; | |
774 | } | |
775 | #endif /* CONFIG_PPP_FILTER */ | |
776 | ||
777 | #ifdef CONFIG_PPP_MULTILINK | |
778 | case PPPIOCSMRRU: | |
779 | if (get_user(val, p)) | |
780 | break; | |
781 | ppp_recv_lock(ppp); | |
782 | ppp->mrru = val; | |
783 | ppp_recv_unlock(ppp); | |
784 | err = 0; | |
785 | break; | |
786 | #endif /* CONFIG_PPP_MULTILINK */ | |
787 | ||
788 | default: | |
789 | err = -ENOTTY; | |
790 | } | |
f3ff8a4d | 791 | unlock_kernel(); |
1da177e4 LT |
792 | return err; |
793 | } | |
794 | ||
273ec51d CG |
795 | static int ppp_unattached_ioctl(struct net *net, struct ppp_file *pf, |
796 | struct file *file, unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
797 | { |
798 | int unit, err = -EFAULT; | |
799 | struct ppp *ppp; | |
800 | struct channel *chan; | |
273ec51d | 801 | struct ppp_net *pn; |
1da177e4 LT |
802 | int __user *p = (int __user *)arg; |
803 | ||
f3ff8a4d | 804 | lock_kernel(); |
1da177e4 LT |
805 | switch (cmd) { |
806 | case PPPIOCNEWUNIT: | |
807 | /* Create a new ppp unit */ | |
808 | if (get_user(unit, p)) | |
809 | break; | |
273ec51d | 810 | ppp = ppp_create_interface(net, unit, &err); |
cd228d54 | 811 | if (!ppp) |
1da177e4 LT |
812 | break; |
813 | file->private_data = &ppp->file; | |
814 | ppp->owner = file; | |
815 | err = -EFAULT; | |
816 | if (put_user(ppp->file.index, p)) | |
817 | break; | |
818 | err = 0; | |
819 | break; | |
820 | ||
821 | case PPPIOCATTACH: | |
822 | /* Attach to an existing ppp unit */ | |
823 | if (get_user(unit, p)) | |
824 | break; | |
1da177e4 | 825 | err = -ENXIO; |
273ec51d CG |
826 | pn = ppp_pernet(net); |
827 | mutex_lock(&pn->all_ppp_mutex); | |
828 | ppp = ppp_find_unit(pn, unit); | |
cd228d54 | 829 | if (ppp) { |
1da177e4 LT |
830 | atomic_inc(&ppp->file.refcnt); |
831 | file->private_data = &ppp->file; | |
832 | err = 0; | |
833 | } | |
273ec51d | 834 | mutex_unlock(&pn->all_ppp_mutex); |
1da177e4 LT |
835 | break; |
836 | ||
837 | case PPPIOCATTCHAN: | |
838 | if (get_user(unit, p)) | |
839 | break; | |
1da177e4 | 840 | err = -ENXIO; |
273ec51d CG |
841 | pn = ppp_pernet(net); |
842 | spin_lock_bh(&pn->all_channels_lock); | |
843 | chan = ppp_find_channel(pn, unit); | |
cd228d54 | 844 | if (chan) { |
1da177e4 LT |
845 | atomic_inc(&chan->file.refcnt); |
846 | file->private_data = &chan->file; | |
847 | err = 0; | |
848 | } | |
273ec51d | 849 | spin_unlock_bh(&pn->all_channels_lock); |
1da177e4 LT |
850 | break; |
851 | ||
852 | default: | |
853 | err = -ENOTTY; | |
854 | } | |
f3ff8a4d | 855 | unlock_kernel(); |
1da177e4 LT |
856 | return err; |
857 | } | |
858 | ||
d54b1fdb | 859 | static const struct file_operations ppp_device_fops = { |
1da177e4 LT |
860 | .owner = THIS_MODULE, |
861 | .read = ppp_read, | |
862 | .write = ppp_write, | |
863 | .poll = ppp_poll, | |
f3ff8a4d | 864 | .unlocked_ioctl = ppp_ioctl, |
1da177e4 LT |
865 | .open = ppp_open, |
866 | .release = ppp_release | |
867 | }; | |
868 | ||
273ec51d CG |
869 | static __net_init int ppp_init_net(struct net *net) |
870 | { | |
741a6fa2 | 871 | struct ppp_net *pn = net_generic(net, ppp_net_id); |
273ec51d CG |
872 | |
873 | idr_init(&pn->units_idr); | |
874 | mutex_init(&pn->all_ppp_mutex); | |
875 | ||
876 | INIT_LIST_HEAD(&pn->all_channels); | |
877 | INIT_LIST_HEAD(&pn->new_channels); | |
878 | ||
879 | spin_lock_init(&pn->all_channels_lock); | |
880 | ||
273ec51d CG |
881 | return 0; |
882 | } | |
883 | ||
884 | static __net_exit void ppp_exit_net(struct net *net) | |
885 | { | |
741a6fa2 | 886 | struct ppp_net *pn = net_generic(net, ppp_net_id); |
273ec51d | 887 | |
273ec51d | 888 | idr_destroy(&pn->units_idr); |
273ec51d CG |
889 | } |
890 | ||
0012985d | 891 | static struct pernet_operations ppp_net_ops = { |
273ec51d CG |
892 | .init = ppp_init_net, |
893 | .exit = ppp_exit_net, | |
741a6fa2 EB |
894 | .id = &ppp_net_id, |
895 | .size = sizeof(struct ppp_net), | |
273ec51d CG |
896 | }; |
897 | ||
1da177e4 LT |
898 | #define PPP_MAJOR 108 |
899 | ||
900 | /* Called at boot time if ppp is compiled into the kernel, | |
901 | or at module load time (from init_module) if compiled as a module. */ | |
902 | static int __init ppp_init(void) | |
903 | { | |
904 | int err; | |
905 | ||
906 | printk(KERN_INFO "PPP generic driver version " PPP_VERSION "\n"); | |
273ec51d | 907 | |
741a6fa2 | 908 | err = register_pernet_device(&ppp_net_ops); |
273ec51d CG |
909 | if (err) { |
910 | printk(KERN_ERR "failed to register PPP pernet device (%d)\n", err); | |
911 | goto out; | |
1da177e4 LT |
912 | } |
913 | ||
273ec51d CG |
914 | err = register_chrdev(PPP_MAJOR, "ppp", &ppp_device_fops); |
915 | if (err) { | |
1da177e4 | 916 | printk(KERN_ERR "failed to register PPP device (%d)\n", err); |
273ec51d CG |
917 | goto out_net; |
918 | } | |
919 | ||
920 | ppp_class = class_create(THIS_MODULE, "ppp"); | |
921 | if (IS_ERR(ppp_class)) { | |
922 | err = PTR_ERR(ppp_class); | |
923 | goto out_chrdev; | |
924 | } | |
925 | ||
926 | /* not a big deal if we fail here :-) */ | |
927 | device_create(ppp_class, NULL, MKDEV(PPP_MAJOR, 0), NULL, "ppp"); | |
928 | ||
929 | return 0; | |
1da177e4 | 930 | |
1da177e4 LT |
931 | out_chrdev: |
932 | unregister_chrdev(PPP_MAJOR, "ppp"); | |
273ec51d | 933 | out_net: |
741a6fa2 | 934 | unregister_pernet_device(&ppp_net_ops); |
273ec51d CG |
935 | out: |
936 | return err; | |
1da177e4 LT |
937 | } |
938 | ||
939 | /* | |
940 | * Network interface unit routines. | |
941 | */ | |
424efe9c | 942 | static netdev_tx_t |
1da177e4 LT |
943 | ppp_start_xmit(struct sk_buff *skb, struct net_device *dev) |
944 | { | |
c8019bf3 | 945 | struct ppp *ppp = netdev_priv(dev); |
1da177e4 LT |
946 | int npi, proto; |
947 | unsigned char *pp; | |
948 | ||
949 | npi = ethertype_to_npindex(ntohs(skb->protocol)); | |
950 | if (npi < 0) | |
951 | goto outf; | |
952 | ||
953 | /* Drop, accept or reject the packet */ | |
954 | switch (ppp->npmode[npi]) { | |
955 | case NPMODE_PASS: | |
956 | break; | |
957 | case NPMODE_QUEUE: | |
958 | /* it would be nice to have a way to tell the network | |
959 | system to queue this one up for later. */ | |
960 | goto outf; | |
961 | case NPMODE_DROP: | |
962 | case NPMODE_ERROR: | |
963 | goto outf; | |
964 | } | |
965 | ||
966 | /* Put the 2-byte PPP protocol number on the front, | |
967 | making sure there is room for the address and control fields. */ | |
7b797d5b HX |
968 | if (skb_cow_head(skb, PPP_HDRLEN)) |
969 | goto outf; | |
970 | ||
1da177e4 LT |
971 | pp = skb_push(skb, 2); |
972 | proto = npindex_to_proto[npi]; | |
973 | pp[0] = proto >> 8; | |
974 | pp[1] = proto; | |
975 | ||
976 | netif_stop_queue(dev); | |
977 | skb_queue_tail(&ppp->file.xq, skb); | |
978 | ppp_xmit_process(ppp); | |
6ed10654 | 979 | return NETDEV_TX_OK; |
1da177e4 LT |
980 | |
981 | outf: | |
982 | kfree_skb(skb); | |
6ceffd47 | 983 | ++dev->stats.tx_dropped; |
6ed10654 | 984 | return NETDEV_TX_OK; |
1da177e4 LT |
985 | } |
986 | ||
1da177e4 LT |
987 | static int |
988 | ppp_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
989 | { | |
c8019bf3 | 990 | struct ppp *ppp = netdev_priv(dev); |
1da177e4 LT |
991 | int err = -EFAULT; |
992 | void __user *addr = (void __user *) ifr->ifr_ifru.ifru_data; | |
993 | struct ppp_stats stats; | |
994 | struct ppp_comp_stats cstats; | |
995 | char *vers; | |
996 | ||
997 | switch (cmd) { | |
998 | case SIOCGPPPSTATS: | |
999 | ppp_get_stats(ppp, &stats); | |
1000 | if (copy_to_user(addr, &stats, sizeof(stats))) | |
1001 | break; | |
1002 | err = 0; | |
1003 | break; | |
1004 | ||
1005 | case SIOCGPPPCSTATS: | |
1006 | memset(&cstats, 0, sizeof(cstats)); | |
cd228d54 | 1007 | if (ppp->xc_state) |
1da177e4 | 1008 | ppp->xcomp->comp_stat(ppp->xc_state, &cstats.c); |
cd228d54 | 1009 | if (ppp->rc_state) |
1da177e4 LT |
1010 | ppp->rcomp->decomp_stat(ppp->rc_state, &cstats.d); |
1011 | if (copy_to_user(addr, &cstats, sizeof(cstats))) | |
1012 | break; | |
1013 | err = 0; | |
1014 | break; | |
1015 | ||
1016 | case SIOCGPPPVER: | |
1017 | vers = PPP_VERSION; | |
1018 | if (copy_to_user(addr, vers, strlen(vers) + 1)) | |
1019 | break; | |
1020 | err = 0; | |
1021 | break; | |
1022 | ||
1023 | default: | |
1024 | err = -EINVAL; | |
1025 | } | |
1026 | ||
1027 | return err; | |
1028 | } | |
1029 | ||
52256cfc | 1030 | static const struct net_device_ops ppp_netdev_ops = { |
00829823 SH |
1031 | .ndo_start_xmit = ppp_start_xmit, |
1032 | .ndo_do_ioctl = ppp_net_ioctl, | |
52256cfc SH |
1033 | }; |
1034 | ||
1da177e4 LT |
1035 | static void ppp_setup(struct net_device *dev) |
1036 | { | |
52256cfc | 1037 | dev->netdev_ops = &ppp_netdev_ops; |
1da177e4 LT |
1038 | dev->hard_header_len = PPP_HDRLEN; |
1039 | dev->mtu = PPP_MTU; | |
1040 | dev->addr_len = 0; | |
1041 | dev->tx_queue_len = 3; | |
1042 | dev->type = ARPHRD_PPP; | |
1043 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
273ec51d | 1044 | dev->features |= NETIF_F_NETNS_LOCAL; |
8b2d850d | 1045 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1046 | } |
1047 | ||
1048 | /* | |
1049 | * Transmit-side routines. | |
1050 | */ | |
1051 | ||
1052 | /* | |
1053 | * Called to do any work queued up on the transmit side | |
1054 | * that can now be done. | |
1055 | */ | |
1056 | static void | |
1057 | ppp_xmit_process(struct ppp *ppp) | |
1058 | { | |
1059 | struct sk_buff *skb; | |
1060 | ||
1061 | ppp_xmit_lock(ppp); | |
739840d5 | 1062 | if (!ppp->closing) { |
1da177e4 | 1063 | ppp_push(ppp); |
8e95a202 JP |
1064 | while (!ppp->xmit_pending && |
1065 | (skb = skb_dequeue(&ppp->file.xq))) | |
1da177e4 LT |
1066 | ppp_send_frame(ppp, skb); |
1067 | /* If there's no work left to do, tell the core net | |
1068 | code that we can accept some more. */ | |
cd228d54 | 1069 | if (!ppp->xmit_pending && !skb_peek(&ppp->file.xq)) |
1da177e4 LT |
1070 | netif_wake_queue(ppp->dev); |
1071 | } | |
1072 | ppp_xmit_unlock(ppp); | |
1073 | } | |
1074 | ||
b3f9b92a MD |
1075 | static inline struct sk_buff * |
1076 | pad_compress_skb(struct ppp *ppp, struct sk_buff *skb) | |
1077 | { | |
1078 | struct sk_buff *new_skb; | |
1079 | int len; | |
1080 | int new_skb_size = ppp->dev->mtu + | |
1081 | ppp->xcomp->comp_extra + ppp->dev->hard_header_len; | |
1082 | int compressor_skb_size = ppp->dev->mtu + | |
1083 | ppp->xcomp->comp_extra + PPP_HDRLEN; | |
1084 | new_skb = alloc_skb(new_skb_size, GFP_ATOMIC); | |
1085 | if (!new_skb) { | |
1086 | if (net_ratelimit()) | |
1087 | printk(KERN_ERR "PPP: no memory (comp pkt)\n"); | |
1088 | return NULL; | |
1089 | } | |
1090 | if (ppp->dev->hard_header_len > PPP_HDRLEN) | |
1091 | skb_reserve(new_skb, | |
1092 | ppp->dev->hard_header_len - PPP_HDRLEN); | |
1093 | ||
1094 | /* compressor still expects A/C bytes in hdr */ | |
1095 | len = ppp->xcomp->compress(ppp->xc_state, skb->data - 2, | |
1096 | new_skb->data, skb->len + 2, | |
1097 | compressor_skb_size); | |
1098 | if (len > 0 && (ppp->flags & SC_CCP_UP)) { | |
1099 | kfree_skb(skb); | |
1100 | skb = new_skb; | |
1101 | skb_put(skb, len); | |
1102 | skb_pull(skb, 2); /* pull off A/C bytes */ | |
1103 | } else if (len == 0) { | |
1104 | /* didn't compress, or CCP not up yet */ | |
1105 | kfree_skb(new_skb); | |
1106 | new_skb = skb; | |
1107 | } else { | |
1108 | /* | |
1109 | * (len < 0) | |
1110 | * MPPE requires that we do not send unencrypted | |
1111 | * frames. The compressor will return -1 if we | |
1112 | * should drop the frame. We cannot simply test | |
1113 | * the compress_proto because MPPE and MPPC share | |
1114 | * the same number. | |
1115 | */ | |
1116 | if (net_ratelimit()) | |
1117 | printk(KERN_ERR "ppp: compressor dropped pkt\n"); | |
1118 | kfree_skb(skb); | |
1119 | kfree_skb(new_skb); | |
1120 | new_skb = NULL; | |
1121 | } | |
1122 | return new_skb; | |
1123 | } | |
1124 | ||
1da177e4 LT |
1125 | /* |
1126 | * Compress and send a frame. | |
1127 | * The caller should have locked the xmit path, | |
1128 | * and xmit_pending should be 0. | |
1129 | */ | |
1130 | static void | |
1131 | ppp_send_frame(struct ppp *ppp, struct sk_buff *skb) | |
1132 | { | |
1133 | int proto = PPP_PROTO(skb); | |
1134 | struct sk_buff *new_skb; | |
1135 | int len; | |
1136 | unsigned char *cp; | |
1137 | ||
1138 | if (proto < 0x8000) { | |
1139 | #ifdef CONFIG_PPP_FILTER | |
1140 | /* check if we should pass this packet */ | |
1141 | /* the filter instructions are constructed assuming | |
1142 | a four-byte PPP header on each packet */ | |
1143 | *skb_push(skb, 2) = 1; | |
8e95a202 JP |
1144 | if (ppp->pass_filter && |
1145 | sk_run_filter(skb, ppp->pass_filter, | |
1146 | ppp->pass_len) == 0) { | |
1da177e4 LT |
1147 | if (ppp->debug & 1) |
1148 | printk(KERN_DEBUG "PPP: outbound frame not passed\n"); | |
1149 | kfree_skb(skb); | |
1150 | return; | |
1151 | } | |
1152 | /* if this packet passes the active filter, record the time */ | |
8e95a202 JP |
1153 | if (!(ppp->active_filter && |
1154 | sk_run_filter(skb, ppp->active_filter, | |
1155 | ppp->active_len) == 0)) | |
1da177e4 LT |
1156 | ppp->last_xmit = jiffies; |
1157 | skb_pull(skb, 2); | |
1158 | #else | |
1159 | /* for data packets, record the time */ | |
1160 | ppp->last_xmit = jiffies; | |
1161 | #endif /* CONFIG_PPP_FILTER */ | |
1162 | } | |
1163 | ||
8c0469cd PZ |
1164 | ++ppp->dev->stats.tx_packets; |
1165 | ppp->dev->stats.tx_bytes += skb->len - 2; | |
1da177e4 LT |
1166 | |
1167 | switch (proto) { | |
1168 | case PPP_IP: | |
cd228d54 | 1169 | if (!ppp->vj || (ppp->flags & SC_COMP_TCP) == 0) |
1da177e4 LT |
1170 | break; |
1171 | /* try to do VJ TCP header compression */ | |
1172 | new_skb = alloc_skb(skb->len + ppp->dev->hard_header_len - 2, | |
1173 | GFP_ATOMIC); | |
cd228d54 | 1174 | if (!new_skb) { |
1da177e4 LT |
1175 | printk(KERN_ERR "PPP: no memory (VJ comp pkt)\n"); |
1176 | goto drop; | |
1177 | } | |
1178 | skb_reserve(new_skb, ppp->dev->hard_header_len - 2); | |
1179 | cp = skb->data + 2; | |
1180 | len = slhc_compress(ppp->vj, cp, skb->len - 2, | |
1181 | new_skb->data + 2, &cp, | |
1182 | !(ppp->flags & SC_NO_TCP_CCID)); | |
1183 | if (cp == skb->data + 2) { | |
1184 | /* didn't compress */ | |
1185 | kfree_skb(new_skb); | |
1186 | } else { | |
1187 | if (cp[0] & SL_TYPE_COMPRESSED_TCP) { | |
1188 | proto = PPP_VJC_COMP; | |
1189 | cp[0] &= ~SL_TYPE_COMPRESSED_TCP; | |
1190 | } else { | |
1191 | proto = PPP_VJC_UNCOMP; | |
1192 | cp[0] = skb->data[2]; | |
1193 | } | |
1194 | kfree_skb(skb); | |
1195 | skb = new_skb; | |
1196 | cp = skb_put(skb, len + 2); | |
1197 | cp[0] = 0; | |
1198 | cp[1] = proto; | |
1199 | } | |
1200 | break; | |
1201 | ||
1202 | case PPP_CCP: | |
1203 | /* peek at outbound CCP frames */ | |
1204 | ppp_ccp_peek(ppp, skb, 0); | |
1205 | break; | |
1206 | } | |
1207 | ||
1208 | /* try to do packet compression */ | |
8e95a202 JP |
1209 | if ((ppp->xstate & SC_COMP_RUN) && ppp->xc_state && |
1210 | proto != PPP_LCP && proto != PPP_CCP) { | |
b3f9b92a MD |
1211 | if (!(ppp->flags & SC_CCP_UP) && (ppp->flags & SC_MUST_COMP)) { |
1212 | if (net_ratelimit()) | |
1213 | printk(KERN_ERR "ppp: compression required but down - pkt dropped.\n"); | |
1da177e4 LT |
1214 | goto drop; |
1215 | } | |
b3f9b92a MD |
1216 | skb = pad_compress_skb(ppp, skb); |
1217 | if (!skb) | |
1218 | goto drop; | |
1da177e4 LT |
1219 | } |
1220 | ||
1221 | /* | |
1222 | * If we are waiting for traffic (demand dialling), | |
1223 | * queue it up for pppd to receive. | |
1224 | */ | |
1225 | if (ppp->flags & SC_LOOP_TRAFFIC) { | |
1226 | if (ppp->file.rq.qlen > PPP_MAX_RQLEN) | |
1227 | goto drop; | |
1228 | skb_queue_tail(&ppp->file.rq, skb); | |
1229 | wake_up_interruptible(&ppp->file.rwait); | |
1230 | return; | |
1231 | } | |
1232 | ||
1233 | ppp->xmit_pending = skb; | |
1234 | ppp_push(ppp); | |
1235 | return; | |
1236 | ||
1237 | drop: | |
1d2f8c95 | 1238 | kfree_skb(skb); |
8c0469cd | 1239 | ++ppp->dev->stats.tx_errors; |
1da177e4 LT |
1240 | } |
1241 | ||
1242 | /* | |
1243 | * Try to send the frame in xmit_pending. | |
1244 | * The caller should have the xmit path locked. | |
1245 | */ | |
1246 | static void | |
1247 | ppp_push(struct ppp *ppp) | |
1248 | { | |
1249 | struct list_head *list; | |
1250 | struct channel *pch; | |
1251 | struct sk_buff *skb = ppp->xmit_pending; | |
1252 | ||
cd228d54 | 1253 | if (!skb) |
1da177e4 LT |
1254 | return; |
1255 | ||
1256 | list = &ppp->channels; | |
1257 | if (list_empty(list)) { | |
1258 | /* nowhere to send the packet, just drop it */ | |
1259 | ppp->xmit_pending = NULL; | |
1260 | kfree_skb(skb); | |
1261 | return; | |
1262 | } | |
1263 | ||
1264 | if ((ppp->flags & SC_MULTILINK) == 0) { | |
1265 | /* not doing multilink: send it down the first channel */ | |
1266 | list = list->next; | |
1267 | pch = list_entry(list, struct channel, clist); | |
1268 | ||
1269 | spin_lock_bh(&pch->downl); | |
1270 | if (pch->chan) { | |
1271 | if (pch->chan->ops->start_xmit(pch->chan, skb)) | |
1272 | ppp->xmit_pending = NULL; | |
1273 | } else { | |
1274 | /* channel got unregistered */ | |
1275 | kfree_skb(skb); | |
1276 | ppp->xmit_pending = NULL; | |
1277 | } | |
1278 | spin_unlock_bh(&pch->downl); | |
1279 | return; | |
1280 | } | |
1281 | ||
1282 | #ifdef CONFIG_PPP_MULTILINK | |
1283 | /* Multilink: fragment the packet over as many links | |
1284 | as can take the packet at the moment. */ | |
1285 | if (!ppp_mp_explode(ppp, skb)) | |
1286 | return; | |
1287 | #endif /* CONFIG_PPP_MULTILINK */ | |
1288 | ||
1289 | ppp->xmit_pending = NULL; | |
1290 | kfree_skb(skb); | |
1291 | } | |
1292 | ||
1293 | #ifdef CONFIG_PPP_MULTILINK | |
1294 | /* | |
1295 | * Divide a packet to be transmitted into fragments and | |
1296 | * send them out the individual links. | |
1297 | */ | |
1298 | static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb) | |
1299 | { | |
fa44a73c LS |
1300 | int len, totlen; |
1301 | int i, bits, hdrlen, mtu; | |
1302 | int flen; | |
1303 | int navail, nfree, nzero; | |
1304 | int nbigger; | |
1305 | int totspeed; | |
1306 | int totfree; | |
1da177e4 LT |
1307 | unsigned char *p, *q; |
1308 | struct list_head *list; | |
1309 | struct channel *pch; | |
1310 | struct sk_buff *frag; | |
1311 | struct ppp_channel *chan; | |
1312 | ||
9c705260 | 1313 | totspeed = 0; /*total bitrate of the bundle*/ |
fa44a73c LS |
1314 | nfree = 0; /* # channels which have no packet already queued */ |
1315 | navail = 0; /* total # of usable channels (not deregistered) */ | |
1316 | nzero = 0; /* number of channels with zero speed associated*/ | |
1317 | totfree = 0; /*total # of channels available and | |
9c705260 GP |
1318 | *having no queued packets before |
1319 | *starting the fragmentation*/ | |
1320 | ||
1da177e4 | 1321 | hdrlen = (ppp->flags & SC_MP_XSHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN; |
fa44a73c LS |
1322 | i = 0; |
1323 | list_for_each_entry(pch, &ppp->channels, clist) { | |
516cd15f | 1324 | navail += pch->avail = (pch->chan != NULL); |
9c705260 | 1325 | pch->speed = pch->chan->speed; |
fa44a73c | 1326 | if (pch->avail) { |
b03efcfb | 1327 | if (skb_queue_empty(&pch->file.xq) || |
fa44a73c | 1328 | !pch->had_frag) { |
9c705260 GP |
1329 | if (pch->speed == 0) |
1330 | nzero++; | |
1331 | else | |
1332 | totspeed += pch->speed; | |
1333 | ||
1334 | pch->avail = 2; | |
1335 | ++nfree; | |
1336 | ++totfree; | |
1337 | } | |
fa44a73c LS |
1338 | if (!pch->had_frag && i < ppp->nxchan) |
1339 | ppp->nxchan = i; | |
1da177e4 | 1340 | } |
516cd15f | 1341 | ++i; |
1da177e4 | 1342 | } |
516cd15f | 1343 | /* |
fa44a73c LS |
1344 | * Don't start sending this packet unless at least half of |
1345 | * the channels are free. This gives much better TCP | |
1346 | * performance if we have a lot of channels. | |
516cd15f | 1347 | */ |
fa44a73c LS |
1348 | if (nfree == 0 || nfree < navail / 2) |
1349 | return 0; /* can't take now, leave it in xmit_pending */ | |
1da177e4 LT |
1350 | |
1351 | /* Do protocol field compression (XXX this should be optional) */ | |
fa44a73c LS |
1352 | p = skb->data; |
1353 | len = skb->len; | |
1da177e4 LT |
1354 | if (*p == 0) { |
1355 | ++p; | |
1356 | --len; | |
1357 | } | |
1358 | ||
9c705260 | 1359 | totlen = len; |
fa44a73c | 1360 | nbigger = len % nfree; |
9c705260 | 1361 | |
fa44a73c LS |
1362 | /* skip to the channel after the one we last used |
1363 | and start at that one */ | |
81616c5a | 1364 | list = &ppp->channels; |
fa44a73c | 1365 | for (i = 0; i < ppp->nxchan; ++i) { |
1da177e4 | 1366 | list = list->next; |
fa44a73c LS |
1367 | if (list == &ppp->channels) { |
1368 | i = 0; | |
1da177e4 LT |
1369 | break; |
1370 | } | |
1371 | } | |
1372 | ||
fa44a73c | 1373 | /* create a fragment for each channel */ |
1da177e4 | 1374 | bits = B; |
fa44a73c | 1375 | while (len > 0) { |
1da177e4 | 1376 | list = list->next; |
fa44a73c LS |
1377 | if (list == &ppp->channels) { |
1378 | i = 0; | |
1da177e4 LT |
1379 | continue; |
1380 | } | |
fa44a73c | 1381 | pch = list_entry(list, struct channel, clist); |
1da177e4 LT |
1382 | ++i; |
1383 | if (!pch->avail) | |
1384 | continue; | |
1385 | ||
516cd15f | 1386 | /* |
fa44a73c LS |
1387 | * Skip this channel if it has a fragment pending already and |
1388 | * we haven't given a fragment to all of the free channels. | |
516cd15f PM |
1389 | */ |
1390 | if (pch->avail == 1) { | |
fa44a73c | 1391 | if (nfree > 0) |
516cd15f PM |
1392 | continue; |
1393 | } else { | |
516cd15f PM |
1394 | pch->avail = 1; |
1395 | } | |
1396 | ||
1da177e4 LT |
1397 | /* check the channel's mtu and whether it is still attached. */ |
1398 | spin_lock_bh(&pch->downl); | |
516cd15f | 1399 | if (pch->chan == NULL) { |
fa44a73c | 1400 | /* can't use this channel, it's being deregistered */ |
9c705260 GP |
1401 | if (pch->speed == 0) |
1402 | nzero--; | |
1403 | else | |
fa44a73c | 1404 | totspeed -= pch->speed; |
9c705260 | 1405 | |
1da177e4 LT |
1406 | spin_unlock_bh(&pch->downl); |
1407 | pch->avail = 0; | |
9c705260 GP |
1408 | totlen = len; |
1409 | totfree--; | |
1410 | nfree--; | |
fa44a73c | 1411 | if (--navail == 0) |
1da177e4 LT |
1412 | break; |
1413 | continue; | |
1414 | } | |
1415 | ||
1416 | /* | |
9c705260 | 1417 | *if the channel speed is not set divide |
fa44a73c | 1418 | *the packet evenly among the free channels; |
9c705260 GP |
1419 | *otherwise divide it according to the speed |
1420 | *of the channel we are going to transmit on | |
1421 | */ | |
886f9fe6 | 1422 | flen = len; |
a53a8b56 BM |
1423 | if (nfree > 0) { |
1424 | if (pch->speed == 0) { | |
fa44a73c | 1425 | flen = totlen/nfree; |
a53a8b56 BM |
1426 | if (nbigger > 0) { |
1427 | flen++; | |
1428 | nbigger--; | |
1429 | } | |
1430 | } else { | |
1431 | flen = (((totfree - nzero)*(totlen + hdrlen*totfree)) / | |
1432 | ((totspeed*totfree)/pch->speed)) - hdrlen; | |
1433 | if (nbigger > 0) { | |
1434 | flen += ((totfree - nzero)*pch->speed)/totspeed; | |
1435 | nbigger -= ((totfree - nzero)*pch->speed)/ | |
9c705260 | 1436 | totspeed; |
a53a8b56 | 1437 | } |
9c705260 | 1438 | } |
a53a8b56 | 1439 | nfree--; |
9c705260 | 1440 | } |
9c705260 GP |
1441 | |
1442 | /* | |
fa44a73c LS |
1443 | *check if we are on the last channel or |
1444 | *we exceded the lenght of the data to | |
9c705260 GP |
1445 | *fragment |
1446 | */ | |
a53a8b56 | 1447 | if ((nfree <= 0) || (flen > len)) |
9c705260 GP |
1448 | flen = len; |
1449 | /* | |
1450 | *it is not worth to tx on slow channels: | |
1451 | *in that case from the resulting flen according to the | |
1452 | *above formula will be equal or less than zero. | |
1453 | *Skip the channel in this case | |
1da177e4 | 1454 | */ |
fa44a73c | 1455 | if (flen <= 0) { |
9c705260 GP |
1456 | pch->avail = 2; |
1457 | spin_unlock_bh(&pch->downl); | |
1458 | continue; | |
1459 | } | |
1460 | ||
fa44a73c LS |
1461 | mtu = pch->chan->mtu - hdrlen; |
1462 | if (mtu < 4) | |
1463 | mtu = 4; | |
516cd15f PM |
1464 | if (flen > mtu) |
1465 | flen = mtu; | |
fa44a73c LS |
1466 | if (flen == len) |
1467 | bits |= E; | |
1468 | frag = alloc_skb(flen + hdrlen + (flen == 0), GFP_ATOMIC); | |
cd228d54 | 1469 | if (!frag) |
516cd15f | 1470 | goto noskb; |
fa44a73c | 1471 | q = skb_put(frag, flen + hdrlen); |
516cd15f | 1472 | |
fa44a73c | 1473 | /* make the MP header */ |
516cd15f PM |
1474 | q[0] = PPP_MP >> 8; |
1475 | q[1] = PPP_MP; | |
1476 | if (ppp->flags & SC_MP_XSHORTSEQ) { | |
fa44a73c | 1477 | q[2] = bits + ((ppp->nxseq >> 8) & 0xf); |
516cd15f PM |
1478 | q[3] = ppp->nxseq; |
1479 | } else { | |
1480 | q[2] = bits; | |
1481 | q[3] = ppp->nxseq >> 16; | |
1482 | q[4] = ppp->nxseq >> 8; | |
1483 | q[5] = ppp->nxseq; | |
1da177e4 | 1484 | } |
516cd15f | 1485 | |
9c705260 | 1486 | memcpy(q + hdrlen, p, flen); |
516cd15f PM |
1487 | |
1488 | /* try to send it down the channel */ | |
1489 | chan = pch->chan; | |
fa44a73c | 1490 | if (!skb_queue_empty(&pch->file.xq) || |
9c705260 | 1491 | !chan->ops->start_xmit(chan, frag)) |
516cd15f | 1492 | skb_queue_tail(&pch->file.xq, frag); |
fa44a73c | 1493 | pch->had_frag = 1; |
516cd15f | 1494 | p += flen; |
fa44a73c | 1495 | len -= flen; |
516cd15f PM |
1496 | ++ppp->nxseq; |
1497 | bits = 0; | |
1da177e4 | 1498 | spin_unlock_bh(&pch->downl); |
516cd15f | 1499 | } |
fa44a73c | 1500 | ppp->nxchan = i; |
1da177e4 LT |
1501 | |
1502 | return 1; | |
1503 | ||
1504 | noskb: | |
1505 | spin_unlock_bh(&pch->downl); | |
1506 | if (ppp->debug & 1) | |
fa44a73c | 1507 | printk(KERN_ERR "PPP: no memory (fragment)\n"); |
8c0469cd | 1508 | ++ppp->dev->stats.tx_errors; |
1da177e4 LT |
1509 | ++ppp->nxseq; |
1510 | return 1; /* abandon the frame */ | |
1511 | } | |
1512 | #endif /* CONFIG_PPP_MULTILINK */ | |
1513 | ||
1514 | /* | |
1515 | * Try to send data out on a channel. | |
1516 | */ | |
1517 | static void | |
1518 | ppp_channel_push(struct channel *pch) | |
1519 | { | |
1520 | struct sk_buff *skb; | |
1521 | struct ppp *ppp; | |
1522 | ||
1523 | spin_lock_bh(&pch->downl); | |
cd228d54 | 1524 | if (pch->chan) { |
b03efcfb | 1525 | while (!skb_queue_empty(&pch->file.xq)) { |
1da177e4 LT |
1526 | skb = skb_dequeue(&pch->file.xq); |
1527 | if (!pch->chan->ops->start_xmit(pch->chan, skb)) { | |
1528 | /* put the packet back and try again later */ | |
1529 | skb_queue_head(&pch->file.xq, skb); | |
1530 | break; | |
1531 | } | |
1532 | } | |
1533 | } else { | |
1534 | /* channel got deregistered */ | |
1535 | skb_queue_purge(&pch->file.xq); | |
1536 | } | |
1537 | spin_unlock_bh(&pch->downl); | |
1538 | /* see if there is anything from the attached unit to be sent */ | |
b03efcfb | 1539 | if (skb_queue_empty(&pch->file.xq)) { |
1da177e4 LT |
1540 | read_lock_bh(&pch->upl); |
1541 | ppp = pch->ppp; | |
cd228d54 | 1542 | if (ppp) |
1da177e4 LT |
1543 | ppp_xmit_process(ppp); |
1544 | read_unlock_bh(&pch->upl); | |
1545 | } | |
1546 | } | |
1547 | ||
1548 | /* | |
1549 | * Receive-side routines. | |
1550 | */ | |
1551 | ||
1552 | /* misuse a few fields of the skb for MP reconstruction */ | |
1553 | #define sequence priority | |
1554 | #define BEbits cb[0] | |
1555 | ||
1556 | static inline void | |
1557 | ppp_do_recv(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) | |
1558 | { | |
1559 | ppp_recv_lock(ppp); | |
739840d5 | 1560 | if (!ppp->closing) |
1da177e4 LT |
1561 | ppp_receive_frame(ppp, skb, pch); |
1562 | else | |
1563 | kfree_skb(skb); | |
1564 | ppp_recv_unlock(ppp); | |
1565 | } | |
1566 | ||
1567 | void | |
1568 | ppp_input(struct ppp_channel *chan, struct sk_buff *skb) | |
1569 | { | |
1570 | struct channel *pch = chan->ppp; | |
1571 | int proto; | |
1572 | ||
ea8420e9 | 1573 | if (!pch) { |
1da177e4 LT |
1574 | kfree_skb(skb); |
1575 | return; | |
1576 | } | |
516cd15f | 1577 | |
1da177e4 | 1578 | read_lock_bh(&pch->upl); |
ea8420e9 SA |
1579 | if (!pskb_may_pull(skb, 2)) { |
1580 | kfree_skb(skb); | |
1581 | if (pch->ppp) { | |
1582 | ++pch->ppp->dev->stats.rx_length_errors; | |
1583 | ppp_receive_error(pch->ppp); | |
1584 | } | |
1585 | goto done; | |
1586 | } | |
1587 | ||
1588 | proto = PPP_PROTO(skb); | |
cd228d54 | 1589 | if (!pch->ppp || proto >= 0xc000 || proto == PPP_CCPFRAG) { |
1da177e4 LT |
1590 | /* put it on the channel queue */ |
1591 | skb_queue_tail(&pch->file.rq, skb); | |
1592 | /* drop old frames if queue too long */ | |
8e95a202 JP |
1593 | while (pch->file.rq.qlen > PPP_MAX_RQLEN && |
1594 | (skb = skb_dequeue(&pch->file.rq))) | |
1da177e4 LT |
1595 | kfree_skb(skb); |
1596 | wake_up_interruptible(&pch->file.rwait); | |
1597 | } else { | |
1598 | ppp_do_recv(pch->ppp, skb, pch); | |
1599 | } | |
ea8420e9 SA |
1600 | |
1601 | done: | |
1da177e4 LT |
1602 | read_unlock_bh(&pch->upl); |
1603 | } | |
1604 | ||
1605 | /* Put a 0-length skb in the receive queue as an error indication */ | |
1606 | void | |
1607 | ppp_input_error(struct ppp_channel *chan, int code) | |
1608 | { | |
1609 | struct channel *pch = chan->ppp; | |
1610 | struct sk_buff *skb; | |
1611 | ||
cd228d54 | 1612 | if (!pch) |
1da177e4 LT |
1613 | return; |
1614 | ||
1615 | read_lock_bh(&pch->upl); | |
cd228d54 | 1616 | if (pch->ppp) { |
1da177e4 | 1617 | skb = alloc_skb(0, GFP_ATOMIC); |
cd228d54 | 1618 | if (skb) { |
1da177e4 LT |
1619 | skb->len = 0; /* probably unnecessary */ |
1620 | skb->cb[0] = code; | |
1621 | ppp_do_recv(pch->ppp, skb, pch); | |
1622 | } | |
1623 | } | |
1624 | read_unlock_bh(&pch->upl); | |
1625 | } | |
1626 | ||
1627 | /* | |
1628 | * We come in here to process a received frame. | |
1629 | * The receive side of the ppp unit is locked. | |
1630 | */ | |
1631 | static void | |
1632 | ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) | |
1633 | { | |
ea8420e9 SA |
1634 | /* note: a 0-length skb is used as an error indication */ |
1635 | if (skb->len > 0) { | |
1da177e4 LT |
1636 | #ifdef CONFIG_PPP_MULTILINK |
1637 | /* XXX do channel-level decompression here */ | |
1638 | if (PPP_PROTO(skb) == PPP_MP) | |
1639 | ppp_receive_mp_frame(ppp, skb, pch); | |
1640 | else | |
1641 | #endif /* CONFIG_PPP_MULTILINK */ | |
1642 | ppp_receive_nonmp_frame(ppp, skb); | |
ea8420e9 SA |
1643 | } else { |
1644 | kfree_skb(skb); | |
1645 | ppp_receive_error(ppp); | |
1da177e4 | 1646 | } |
1da177e4 LT |
1647 | } |
1648 | ||
1649 | static void | |
1650 | ppp_receive_error(struct ppp *ppp) | |
1651 | { | |
8c0469cd | 1652 | ++ppp->dev->stats.rx_errors; |
cd228d54 | 1653 | if (ppp->vj) |
1da177e4 LT |
1654 | slhc_toss(ppp->vj); |
1655 | } | |
1656 | ||
1657 | static void | |
1658 | ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb) | |
1659 | { | |
1660 | struct sk_buff *ns; | |
1661 | int proto, len, npi; | |
1662 | ||
1663 | /* | |
1664 | * Decompress the frame, if compressed. | |
1665 | * Note that some decompressors need to see uncompressed frames | |
1666 | * that come in as well as compressed frames. | |
1667 | */ | |
8e95a202 JP |
1668 | if (ppp->rc_state && (ppp->rstate & SC_DECOMP_RUN) && |
1669 | (ppp->rstate & (SC_DC_FERROR | SC_DC_ERROR)) == 0) | |
1da177e4 LT |
1670 | skb = ppp_decompress_frame(ppp, skb); |
1671 | ||
b3f9b92a MD |
1672 | if (ppp->flags & SC_MUST_COMP && ppp->rstate & SC_DC_FERROR) |
1673 | goto err; | |
1674 | ||
1da177e4 LT |
1675 | proto = PPP_PROTO(skb); |
1676 | switch (proto) { | |
1677 | case PPP_VJC_COMP: | |
1678 | /* decompress VJ compressed packets */ | |
cd228d54 | 1679 | if (!ppp->vj || (ppp->flags & SC_REJ_COMP_TCP)) |
1da177e4 LT |
1680 | goto err; |
1681 | ||
2a38b775 | 1682 | if (skb_tailroom(skb) < 124 || skb_cloned(skb)) { |
1da177e4 LT |
1683 | /* copy to a new sk_buff with more tailroom */ |
1684 | ns = dev_alloc_skb(skb->len + 128); | |
cd228d54 | 1685 | if (!ns) { |
1da177e4 LT |
1686 | printk(KERN_ERR"PPP: no memory (VJ decomp)\n"); |
1687 | goto err; | |
1688 | } | |
1689 | skb_reserve(ns, 2); | |
1690 | skb_copy_bits(skb, 0, skb_put(ns, skb->len), skb->len); | |
1691 | kfree_skb(skb); | |
1692 | skb = ns; | |
1693 | } | |
e3f749c4 HX |
1694 | else |
1695 | skb->ip_summed = CHECKSUM_NONE; | |
1da177e4 LT |
1696 | |
1697 | len = slhc_uncompress(ppp->vj, skb->data + 2, skb->len - 2); | |
1698 | if (len <= 0) { | |
1699 | printk(KERN_DEBUG "PPP: VJ decompression error\n"); | |
1700 | goto err; | |
1701 | } | |
1702 | len += 2; | |
1703 | if (len > skb->len) | |
1704 | skb_put(skb, len - skb->len); | |
1705 | else if (len < skb->len) | |
1706 | skb_trim(skb, len); | |
1707 | proto = PPP_IP; | |
1708 | break; | |
1709 | ||
1710 | case PPP_VJC_UNCOMP: | |
cd228d54 | 1711 | if (!ppp->vj || (ppp->flags & SC_REJ_COMP_TCP)) |
1da177e4 | 1712 | goto err; |
6aa20a22 | 1713 | |
1da177e4 LT |
1714 | /* Until we fix the decompressor need to make sure |
1715 | * data portion is linear. | |
1716 | */ | |
6aa20a22 | 1717 | if (!pskb_may_pull(skb, skb->len)) |
1da177e4 LT |
1718 | goto err; |
1719 | ||
1720 | if (slhc_remember(ppp->vj, skb->data + 2, skb->len - 2) <= 0) { | |
1721 | printk(KERN_ERR "PPP: VJ uncompressed error\n"); | |
1722 | goto err; | |
1723 | } | |
1724 | proto = PPP_IP; | |
1725 | break; | |
1726 | ||
1727 | case PPP_CCP: | |
1728 | ppp_ccp_peek(ppp, skb, 1); | |
1729 | break; | |
1730 | } | |
1731 | ||
8c0469cd PZ |
1732 | ++ppp->dev->stats.rx_packets; |
1733 | ppp->dev->stats.rx_bytes += skb->len - 2; | |
1da177e4 LT |
1734 | |
1735 | npi = proto_to_npindex(proto); | |
1736 | if (npi < 0) { | |
1737 | /* control or unknown frame - pass it to pppd */ | |
1738 | skb_queue_tail(&ppp->file.rq, skb); | |
1739 | /* limit queue length by dropping old frames */ | |
8e95a202 JP |
1740 | while (ppp->file.rq.qlen > PPP_MAX_RQLEN && |
1741 | (skb = skb_dequeue(&ppp->file.rq))) | |
1da177e4 LT |
1742 | kfree_skb(skb); |
1743 | /* wake up any process polling or blocking on read */ | |
1744 | wake_up_interruptible(&ppp->file.rwait); | |
1745 | ||
1746 | } else { | |
1747 | /* network protocol frame - give it to the kernel */ | |
1748 | ||
1749 | #ifdef CONFIG_PPP_FILTER | |
1750 | /* check if the packet passes the pass and active filters */ | |
1751 | /* the filter instructions are constructed assuming | |
1752 | a four-byte PPP header on each packet */ | |
2a38b775 HX |
1753 | if (ppp->pass_filter || ppp->active_filter) { |
1754 | if (skb_cloned(skb) && | |
1755 | pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) | |
1756 | goto err; | |
1757 | ||
1758 | *skb_push(skb, 2) = 0; | |
8e95a202 JP |
1759 | if (ppp->pass_filter && |
1760 | sk_run_filter(skb, ppp->pass_filter, | |
1761 | ppp->pass_len) == 0) { | |
2a38b775 HX |
1762 | if (ppp->debug & 1) |
1763 | printk(KERN_DEBUG "PPP: inbound frame " | |
1764 | "not passed\n"); | |
1765 | kfree_skb(skb); | |
1766 | return; | |
1767 | } | |
8e95a202 JP |
1768 | if (!(ppp->active_filter && |
1769 | sk_run_filter(skb, ppp->active_filter, | |
1770 | ppp->active_len) == 0)) | |
2a38b775 HX |
1771 | ppp->last_recv = jiffies; |
1772 | __skb_pull(skb, 2); | |
1773 | } else | |
1da177e4 | 1774 | #endif /* CONFIG_PPP_FILTER */ |
2a38b775 | 1775 | ppp->last_recv = jiffies; |
1da177e4 | 1776 | |
8e95a202 JP |
1777 | if ((ppp->dev->flags & IFF_UP) == 0 || |
1778 | ppp->npmode[npi] != NPMODE_PASS) { | |
1da177e4 LT |
1779 | kfree_skb(skb); |
1780 | } else { | |
cbb042f9 HX |
1781 | /* chop off protocol */ |
1782 | skb_pull_rcsum(skb, 2); | |
1da177e4 LT |
1783 | skb->dev = ppp->dev; |
1784 | skb->protocol = htons(npindex_to_ethertype[npi]); | |
459a98ed | 1785 | skb_reset_mac_header(skb); |
1da177e4 | 1786 | netif_rx(skb); |
1da177e4 LT |
1787 | } |
1788 | } | |
1789 | return; | |
1790 | ||
1791 | err: | |
1792 | kfree_skb(skb); | |
1793 | ppp_receive_error(ppp); | |
1794 | } | |
1795 | ||
1796 | static struct sk_buff * | |
1797 | ppp_decompress_frame(struct ppp *ppp, struct sk_buff *skb) | |
1798 | { | |
1799 | int proto = PPP_PROTO(skb); | |
1800 | struct sk_buff *ns; | |
1801 | int len; | |
1802 | ||
1803 | /* Until we fix all the decompressor's need to make sure | |
1804 | * data portion is linear. | |
1805 | */ | |
1806 | if (!pskb_may_pull(skb, skb->len)) | |
1807 | goto err; | |
1808 | ||
1809 | if (proto == PPP_COMP) { | |
4b2a8fb3 KS |
1810 | int obuff_size; |
1811 | ||
1812 | switch(ppp->rcomp->compress_proto) { | |
1813 | case CI_MPPE: | |
1814 | obuff_size = ppp->mru + PPP_HDRLEN + 1; | |
1815 | break; | |
1816 | default: | |
1817 | obuff_size = ppp->mru + PPP_HDRLEN; | |
1818 | break; | |
1819 | } | |
1820 | ||
1821 | ns = dev_alloc_skb(obuff_size); | |
cd228d54 | 1822 | if (!ns) { |
1da177e4 LT |
1823 | printk(KERN_ERR "ppp_decompress_frame: no memory\n"); |
1824 | goto err; | |
1825 | } | |
1826 | /* the decompressor still expects the A/C bytes in the hdr */ | |
1827 | len = ppp->rcomp->decompress(ppp->rc_state, skb->data - 2, | |
06c7af56 | 1828 | skb->len + 2, ns->data, obuff_size); |
1da177e4 LT |
1829 | if (len < 0) { |
1830 | /* Pass the compressed frame to pppd as an | |
1831 | error indication. */ | |
1832 | if (len == DECOMP_FATALERROR) | |
1833 | ppp->rstate |= SC_DC_FERROR; | |
1834 | kfree_skb(ns); | |
1835 | goto err; | |
1836 | } | |
1837 | ||
1838 | kfree_skb(skb); | |
1839 | skb = ns; | |
1840 | skb_put(skb, len); | |
1841 | skb_pull(skb, 2); /* pull off the A/C bytes */ | |
1842 | ||
1843 | } else { | |
1844 | /* Uncompressed frame - pass to decompressor so it | |
1845 | can update its dictionary if necessary. */ | |
1846 | if (ppp->rcomp->incomp) | |
1847 | ppp->rcomp->incomp(ppp->rc_state, skb->data - 2, | |
1848 | skb->len + 2); | |
1849 | } | |
1850 | ||
1851 | return skb; | |
1852 | ||
1853 | err: | |
1854 | ppp->rstate |= SC_DC_ERROR; | |
1855 | ppp_receive_error(ppp); | |
1856 | return skb; | |
1857 | } | |
1858 | ||
1859 | #ifdef CONFIG_PPP_MULTILINK | |
1860 | /* | |
1861 | * Receive a multilink frame. | |
1862 | * We put it on the reconstruction queue and then pull off | |
1863 | * as many completed frames as we can. | |
1864 | */ | |
1865 | static void | |
1866 | ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) | |
1867 | { | |
1868 | u32 mask, seq; | |
81616c5a | 1869 | struct channel *ch; |
1da177e4 LT |
1870 | int mphdrlen = (ppp->flags & SC_MP_SHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN; |
1871 | ||
2a38b775 | 1872 | if (!pskb_may_pull(skb, mphdrlen + 1) || ppp->mrru == 0) |
1da177e4 LT |
1873 | goto err; /* no good, throw it away */ |
1874 | ||
1875 | /* Decode sequence number and begin/end bits */ | |
1876 | if (ppp->flags & SC_MP_SHORTSEQ) { | |
1877 | seq = ((skb->data[2] & 0x0f) << 8) | skb->data[3]; | |
1878 | mask = 0xfff; | |
1879 | } else { | |
1880 | seq = (skb->data[3] << 16) | (skb->data[4] << 8)| skb->data[5]; | |
1881 | mask = 0xffffff; | |
1882 | } | |
1883 | skb->BEbits = skb->data[2]; | |
1884 | skb_pull(skb, mphdrlen); /* pull off PPP and MP headers */ | |
1885 | ||
1886 | /* | |
1887 | * Do protocol ID decompression on the first fragment of each packet. | |
1888 | */ | |
1889 | if ((skb->BEbits & B) && (skb->data[0] & 1)) | |
1890 | *skb_push(skb, 1) = 0; | |
1891 | ||
1892 | /* | |
1893 | * Expand sequence number to 32 bits, making it as close | |
1894 | * as possible to ppp->minseq. | |
1895 | */ | |
1896 | seq |= ppp->minseq & ~mask; | |
1897 | if ((int)(ppp->minseq - seq) > (int)(mask >> 1)) | |
1898 | seq += mask + 1; | |
1899 | else if ((int)(seq - ppp->minseq) > (int)(mask >> 1)) | |
1900 | seq -= mask + 1; /* should never happen */ | |
1901 | skb->sequence = seq; | |
1902 | pch->lastseq = seq; | |
1903 | ||
1904 | /* | |
1905 | * If this packet comes before the next one we were expecting, | |
1906 | * drop it. | |
1907 | */ | |
1908 | if (seq_before(seq, ppp->nextseq)) { | |
1909 | kfree_skb(skb); | |
8c0469cd | 1910 | ++ppp->dev->stats.rx_dropped; |
1da177e4 LT |
1911 | ppp_receive_error(ppp); |
1912 | return; | |
1913 | } | |
1914 | ||
1915 | /* | |
1916 | * Reevaluate minseq, the minimum over all channels of the | |
1917 | * last sequence number received on each channel. Because of | |
1918 | * the increasing sequence number rule, we know that any fragment | |
1919 | * before `minseq' which hasn't arrived is never going to arrive. | |
1920 | * The list of channels can't change because we have the receive | |
1921 | * side of the ppp unit locked. | |
1922 | */ | |
81616c5a | 1923 | list_for_each_entry(ch, &ppp->channels, clist) { |
1da177e4 LT |
1924 | if (seq_before(ch->lastseq, seq)) |
1925 | seq = ch->lastseq; | |
1926 | } | |
1927 | if (seq_before(ppp->minseq, seq)) | |
1928 | ppp->minseq = seq; | |
1929 | ||
1930 | /* Put the fragment on the reconstruction queue */ | |
1931 | ppp_mp_insert(ppp, skb); | |
1932 | ||
1933 | /* If the queue is getting long, don't wait any longer for packets | |
1934 | before the start of the queue. */ | |
38ce7c73 DM |
1935 | if (skb_queue_len(&ppp->mrq) >= PPP_MP_MAX_QLEN) { |
1936 | struct sk_buff *skb = skb_peek(&ppp->mrq); | |
1937 | if (seq_before(ppp->minseq, skb->sequence)) | |
1938 | ppp->minseq = skb->sequence; | |
1939 | } | |
1da177e4 LT |
1940 | |
1941 | /* Pull completed packets off the queue and receive them. */ | |
82b3cc1a BM |
1942 | while ((skb = ppp_mp_reconstruct(ppp))) { |
1943 | if (pskb_may_pull(skb, 2)) | |
1944 | ppp_receive_nonmp_frame(ppp, skb); | |
1945 | else { | |
1946 | ++ppp->dev->stats.rx_length_errors; | |
1947 | kfree_skb(skb); | |
1948 | ppp_receive_error(ppp); | |
1949 | } | |
1950 | } | |
1da177e4 LT |
1951 | |
1952 | return; | |
1953 | ||
1954 | err: | |
1955 | kfree_skb(skb); | |
1956 | ppp_receive_error(ppp); | |
1957 | } | |
1958 | ||
1959 | /* | |
1960 | * Insert a fragment on the MP reconstruction queue. | |
1961 | * The queue is ordered by increasing sequence number. | |
1962 | */ | |
1963 | static void | |
1964 | ppp_mp_insert(struct ppp *ppp, struct sk_buff *skb) | |
1965 | { | |
1966 | struct sk_buff *p; | |
1967 | struct sk_buff_head *list = &ppp->mrq; | |
1968 | u32 seq = skb->sequence; | |
1969 | ||
1970 | /* N.B. we don't need to lock the list lock because we have the | |
1971 | ppp unit receive-side lock. */ | |
13c9821e | 1972 | skb_queue_walk(list, p) { |
1da177e4 LT |
1973 | if (seq_before(seq, p->sequence)) |
1974 | break; | |
13c9821e | 1975 | } |
43f59c89 | 1976 | __skb_queue_before(list, p, skb); |
1da177e4 LT |
1977 | } |
1978 | ||
1979 | /* | |
1980 | * Reconstruct a packet from the MP fragment queue. | |
1981 | * We go through increasing sequence numbers until we find a | |
1982 | * complete packet, or we get to the sequence number for a fragment | |
1983 | * which hasn't arrived but might still do so. | |
1984 | */ | |
3c582b30 | 1985 | static struct sk_buff * |
1da177e4 LT |
1986 | ppp_mp_reconstruct(struct ppp *ppp) |
1987 | { | |
1988 | u32 seq = ppp->nextseq; | |
1989 | u32 minseq = ppp->minseq; | |
1990 | struct sk_buff_head *list = &ppp->mrq; | |
1991 | struct sk_buff *p, *next; | |
1992 | struct sk_buff *head, *tail; | |
1993 | struct sk_buff *skb = NULL; | |
1994 | int lost = 0, len = 0; | |
1995 | ||
1996 | if (ppp->mrru == 0) /* do nothing until mrru is set */ | |
1997 | return NULL; | |
1998 | head = list->next; | |
1999 | tail = NULL; | |
2000 | for (p = head; p != (struct sk_buff *) list; p = next) { | |
2001 | next = p->next; | |
2002 | if (seq_before(p->sequence, seq)) { | |
2003 | /* this can't happen, anyway ignore the skb */ | |
2004 | printk(KERN_ERR "ppp_mp_reconstruct bad seq %u < %u\n", | |
2005 | p->sequence, seq); | |
2006 | head = next; | |
2007 | continue; | |
2008 | } | |
2009 | if (p->sequence != seq) { | |
2010 | /* Fragment `seq' is missing. If it is after | |
2011 | minseq, it might arrive later, so stop here. */ | |
2012 | if (seq_after(seq, minseq)) | |
2013 | break; | |
2014 | /* Fragment `seq' is lost, keep going. */ | |
2015 | lost = 1; | |
2016 | seq = seq_before(minseq, p->sequence)? | |
2017 | minseq + 1: p->sequence; | |
2018 | next = p; | |
2019 | continue; | |
2020 | } | |
2021 | ||
2022 | /* | |
2023 | * At this point we know that all the fragments from | |
2024 | * ppp->nextseq to seq are either present or lost. | |
2025 | * Also, there are no complete packets in the queue | |
2026 | * that have no missing fragments and end before this | |
2027 | * fragment. | |
2028 | */ | |
2029 | ||
2030 | /* B bit set indicates this fragment starts a packet */ | |
2031 | if (p->BEbits & B) { | |
2032 | head = p; | |
2033 | lost = 0; | |
2034 | len = 0; | |
2035 | } | |
2036 | ||
2037 | len += p->len; | |
2038 | ||
2039 | /* Got a complete packet yet? */ | |
2040 | if (lost == 0 && (p->BEbits & E) && (head->BEbits & B)) { | |
2041 | if (len > ppp->mrru + 2) { | |
8c0469cd | 2042 | ++ppp->dev->stats.rx_length_errors; |
1da177e4 LT |
2043 | printk(KERN_DEBUG "PPP: reconstructed packet" |
2044 | " is too long (%d)\n", len); | |
2045 | } else if (p == head) { | |
2046 | /* fragment is complete packet - reuse skb */ | |
2047 | tail = p; | |
2048 | skb = skb_get(p); | |
2049 | break; | |
2050 | } else if ((skb = dev_alloc_skb(len)) == NULL) { | |
8c0469cd | 2051 | ++ppp->dev->stats.rx_missed_errors; |
1da177e4 LT |
2052 | printk(KERN_DEBUG "PPP: no memory for " |
2053 | "reconstructed packet"); | |
2054 | } else { | |
2055 | tail = p; | |
2056 | break; | |
2057 | } | |
2058 | ppp->nextseq = seq + 1; | |
2059 | } | |
2060 | ||
2061 | /* | |
2062 | * If this is the ending fragment of a packet, | |
2063 | * and we haven't found a complete valid packet yet, | |
2064 | * we can discard up to and including this fragment. | |
2065 | */ | |
2066 | if (p->BEbits & E) | |
2067 | head = next; | |
2068 | ||
2069 | ++seq; | |
2070 | } | |
2071 | ||
2072 | /* If we have a complete packet, copy it all into one skb. */ | |
2073 | if (tail != NULL) { | |
2074 | /* If we have discarded any fragments, | |
2075 | signal a receive error. */ | |
2076 | if (head->sequence != ppp->nextseq) { | |
2077 | if (ppp->debug & 1) | |
2078 | printk(KERN_DEBUG " missed pkts %u..%u\n", | |
2079 | ppp->nextseq, head->sequence-1); | |
8c0469cd | 2080 | ++ppp->dev->stats.rx_dropped; |
1da177e4 LT |
2081 | ppp_receive_error(ppp); |
2082 | } | |
2083 | ||
2084 | if (head != tail) | |
2085 | /* copy to a single skb */ | |
2086 | for (p = head; p != tail->next; p = p->next) | |
2087 | skb_copy_bits(p, 0, skb_put(skb, p->len), p->len); | |
2088 | ppp->nextseq = tail->sequence + 1; | |
2089 | head = tail->next; | |
2090 | } | |
2091 | ||
2092 | /* Discard all the skbuffs that we have copied the data out of | |
2093 | or that we can't use. */ | |
2094 | while ((p = list->next) != head) { | |
2095 | __skb_unlink(p, list); | |
2096 | kfree_skb(p); | |
2097 | } | |
2098 | ||
2099 | return skb; | |
2100 | } | |
2101 | #endif /* CONFIG_PPP_MULTILINK */ | |
2102 | ||
2103 | /* | |
2104 | * Channel interface. | |
2105 | */ | |
2106 | ||
273ec51d CG |
2107 | /* Create a new, unattached ppp channel. */ |
2108 | int ppp_register_channel(struct ppp_channel *chan) | |
2109 | { | |
2110 | return ppp_register_net_channel(current->nsproxy->net_ns, chan); | |
2111 | } | |
2112 | ||
2113 | /* Create a new, unattached ppp channel for specified net. */ | |
2114 | int ppp_register_net_channel(struct net *net, struct ppp_channel *chan) | |
1da177e4 LT |
2115 | { |
2116 | struct channel *pch; | |
273ec51d | 2117 | struct ppp_net *pn; |
1da177e4 | 2118 | |
d4274b51 | 2119 | pch = kzalloc(sizeof(struct channel), GFP_KERNEL); |
cd228d54 | 2120 | if (!pch) |
1da177e4 | 2121 | return -ENOMEM; |
273ec51d CG |
2122 | |
2123 | pn = ppp_pernet(net); | |
2124 | ||
1da177e4 LT |
2125 | pch->ppp = NULL; |
2126 | pch->chan = chan; | |
273ec51d | 2127 | pch->chan_net = net; |
1da177e4 LT |
2128 | chan->ppp = pch; |
2129 | init_ppp_file(&pch->file, CHANNEL); | |
2130 | pch->file.hdrlen = chan->hdrlen; | |
2131 | #ifdef CONFIG_PPP_MULTILINK | |
2132 | pch->lastseq = -1; | |
2133 | #endif /* CONFIG_PPP_MULTILINK */ | |
2134 | init_rwsem(&pch->chan_sem); | |
2135 | spin_lock_init(&pch->downl); | |
2136 | rwlock_init(&pch->upl); | |
273ec51d CG |
2137 | |
2138 | spin_lock_bh(&pn->all_channels_lock); | |
2139 | pch->file.index = ++pn->last_channel_index; | |
2140 | list_add(&pch->list, &pn->new_channels); | |
1da177e4 | 2141 | atomic_inc(&channel_count); |
273ec51d CG |
2142 | spin_unlock_bh(&pn->all_channels_lock); |
2143 | ||
1da177e4 LT |
2144 | return 0; |
2145 | } | |
2146 | ||
2147 | /* | |
2148 | * Return the index of a channel. | |
2149 | */ | |
2150 | int ppp_channel_index(struct ppp_channel *chan) | |
2151 | { | |
2152 | struct channel *pch = chan->ppp; | |
2153 | ||
cd228d54 | 2154 | if (pch) |
1da177e4 LT |
2155 | return pch->file.index; |
2156 | return -1; | |
2157 | } | |
2158 | ||
2159 | /* | |
2160 | * Return the PPP unit number to which a channel is connected. | |
2161 | */ | |
2162 | int ppp_unit_number(struct ppp_channel *chan) | |
2163 | { | |
2164 | struct channel *pch = chan->ppp; | |
2165 | int unit = -1; | |
2166 | ||
cd228d54 | 2167 | if (pch) { |
1da177e4 | 2168 | read_lock_bh(&pch->upl); |
cd228d54 | 2169 | if (pch->ppp) |
1da177e4 LT |
2170 | unit = pch->ppp->file.index; |
2171 | read_unlock_bh(&pch->upl); | |
2172 | } | |
2173 | return unit; | |
2174 | } | |
2175 | ||
2176 | /* | |
2177 | * Disconnect a channel from the generic layer. | |
2178 | * This must be called in process context. | |
2179 | */ | |
2180 | void | |
2181 | ppp_unregister_channel(struct ppp_channel *chan) | |
2182 | { | |
2183 | struct channel *pch = chan->ppp; | |
273ec51d | 2184 | struct ppp_net *pn; |
1da177e4 | 2185 | |
cd228d54 | 2186 | if (!pch) |
1da177e4 | 2187 | return; /* should never happen */ |
273ec51d | 2188 | |
1da177e4 LT |
2189 | chan->ppp = NULL; |
2190 | ||
2191 | /* | |
2192 | * This ensures that we have returned from any calls into the | |
2193 | * the channel's start_xmit or ioctl routine before we proceed. | |
2194 | */ | |
2195 | down_write(&pch->chan_sem); | |
2196 | spin_lock_bh(&pch->downl); | |
2197 | pch->chan = NULL; | |
2198 | spin_unlock_bh(&pch->downl); | |
2199 | up_write(&pch->chan_sem); | |
2200 | ppp_disconnect_channel(pch); | |
273ec51d CG |
2201 | |
2202 | pn = ppp_pernet(pch->chan_net); | |
2203 | spin_lock_bh(&pn->all_channels_lock); | |
1da177e4 | 2204 | list_del(&pch->list); |
273ec51d CG |
2205 | spin_unlock_bh(&pn->all_channels_lock); |
2206 | ||
1da177e4 LT |
2207 | pch->file.dead = 1; |
2208 | wake_up_interruptible(&pch->file.rwait); | |
2209 | if (atomic_dec_and_test(&pch->file.refcnt)) | |
2210 | ppp_destroy_channel(pch); | |
2211 | } | |
2212 | ||
2213 | /* | |
2214 | * Callback from a channel when it can accept more to transmit. | |
2215 | * This should be called at BH/softirq level, not interrupt level. | |
2216 | */ | |
2217 | void | |
2218 | ppp_output_wakeup(struct ppp_channel *chan) | |
2219 | { | |
2220 | struct channel *pch = chan->ppp; | |
2221 | ||
cd228d54 | 2222 | if (!pch) |
1da177e4 LT |
2223 | return; |
2224 | ppp_channel_push(pch); | |
2225 | } | |
2226 | ||
2227 | /* | |
2228 | * Compression control. | |
2229 | */ | |
2230 | ||
2231 | /* Process the PPPIOCSCOMPRESS ioctl. */ | |
2232 | static int | |
2233 | ppp_set_compress(struct ppp *ppp, unsigned long arg) | |
2234 | { | |
2235 | int err; | |
2236 | struct compressor *cp, *ocomp; | |
2237 | struct ppp_option_data data; | |
2238 | void *state, *ostate; | |
2239 | unsigned char ccp_option[CCP_MAX_OPTION_LENGTH]; | |
2240 | ||
2241 | err = -EFAULT; | |
8e95a202 JP |
2242 | if (copy_from_user(&data, (void __user *) arg, sizeof(data)) || |
2243 | (data.length <= CCP_MAX_OPTION_LENGTH && | |
2244 | copy_from_user(ccp_option, (void __user *) data.ptr, data.length))) | |
1da177e4 LT |
2245 | goto out; |
2246 | err = -EINVAL; | |
8e95a202 JP |
2247 | if (data.length > CCP_MAX_OPTION_LENGTH || |
2248 | ccp_option[1] < 2 || ccp_option[1] > data.length) | |
1da177e4 LT |
2249 | goto out; |
2250 | ||
a65e5d78 JB |
2251 | cp = try_then_request_module( |
2252 | find_compressor(ccp_option[0]), | |
2253 | "ppp-compress-%d", ccp_option[0]); | |
cd228d54 | 2254 | if (!cp) |
1da177e4 LT |
2255 | goto out; |
2256 | ||
2257 | err = -ENOBUFS; | |
2258 | if (data.transmit) { | |
2259 | state = cp->comp_alloc(ccp_option, data.length); | |
cd228d54 | 2260 | if (state) { |
1da177e4 LT |
2261 | ppp_xmit_lock(ppp); |
2262 | ppp->xstate &= ~SC_COMP_RUN; | |
2263 | ocomp = ppp->xcomp; | |
2264 | ostate = ppp->xc_state; | |
2265 | ppp->xcomp = cp; | |
2266 | ppp->xc_state = state; | |
2267 | ppp_xmit_unlock(ppp); | |
cd228d54 | 2268 | if (ostate) { |
1da177e4 LT |
2269 | ocomp->comp_free(ostate); |
2270 | module_put(ocomp->owner); | |
2271 | } | |
2272 | err = 0; | |
2273 | } else | |
2274 | module_put(cp->owner); | |
2275 | ||
2276 | } else { | |
2277 | state = cp->decomp_alloc(ccp_option, data.length); | |
cd228d54 | 2278 | if (state) { |
1da177e4 LT |
2279 | ppp_recv_lock(ppp); |
2280 | ppp->rstate &= ~SC_DECOMP_RUN; | |
2281 | ocomp = ppp->rcomp; | |
2282 | ostate = ppp->rc_state; | |
2283 | ppp->rcomp = cp; | |
2284 | ppp->rc_state = state; | |
2285 | ppp_recv_unlock(ppp); | |
cd228d54 | 2286 | if (ostate) { |
1da177e4 LT |
2287 | ocomp->decomp_free(ostate); |
2288 | module_put(ocomp->owner); | |
2289 | } | |
2290 | err = 0; | |
2291 | } else | |
2292 | module_put(cp->owner); | |
2293 | } | |
2294 | ||
2295 | out: | |
2296 | return err; | |
2297 | } | |
2298 | ||
2299 | /* | |
2300 | * Look at a CCP packet and update our state accordingly. | |
2301 | * We assume the caller has the xmit or recv path locked. | |
2302 | */ | |
2303 | static void | |
2304 | ppp_ccp_peek(struct ppp *ppp, struct sk_buff *skb, int inbound) | |
2305 | { | |
2306 | unsigned char *dp; | |
2307 | int len; | |
2308 | ||
2309 | if (!pskb_may_pull(skb, CCP_HDRLEN + 2)) | |
2310 | return; /* no header */ | |
2311 | dp = skb->data + 2; | |
2312 | ||
2313 | switch (CCP_CODE(dp)) { | |
2314 | case CCP_CONFREQ: | |
2315 | ||
6aa20a22 | 2316 | /* A ConfReq starts negotiation of compression |
1da177e4 LT |
2317 | * in one direction of transmission, |
2318 | * and hence brings it down...but which way? | |
2319 | * | |
2320 | * Remember: | |
2321 | * A ConfReq indicates what the sender would like to receive | |
2322 | */ | |
2323 | if(inbound) | |
2324 | /* He is proposing what I should send */ | |
2325 | ppp->xstate &= ~SC_COMP_RUN; | |
6aa20a22 | 2326 | else |
1da177e4 LT |
2327 | /* I am proposing to what he should send */ |
2328 | ppp->rstate &= ~SC_DECOMP_RUN; | |
6aa20a22 | 2329 | |
1da177e4 | 2330 | break; |
6aa20a22 | 2331 | |
1da177e4 LT |
2332 | case CCP_TERMREQ: |
2333 | case CCP_TERMACK: | |
2334 | /* | |
6aa20a22 | 2335 | * CCP is going down, both directions of transmission |
1da177e4 LT |
2336 | */ |
2337 | ppp->rstate &= ~SC_DECOMP_RUN; | |
2338 | ppp->xstate &= ~SC_COMP_RUN; | |
2339 | break; | |
2340 | ||
2341 | case CCP_CONFACK: | |
2342 | if ((ppp->flags & (SC_CCP_OPEN | SC_CCP_UP)) != SC_CCP_OPEN) | |
2343 | break; | |
2344 | len = CCP_LENGTH(dp); | |
2345 | if (!pskb_may_pull(skb, len + 2)) | |
2346 | return; /* too short */ | |
2347 | dp += CCP_HDRLEN; | |
2348 | len -= CCP_HDRLEN; | |
2349 | if (len < CCP_OPT_MINLEN || len < CCP_OPT_LENGTH(dp)) | |
2350 | break; | |
2351 | if (inbound) { | |
2352 | /* we will start receiving compressed packets */ | |
cd228d54 | 2353 | if (!ppp->rc_state) |
1da177e4 LT |
2354 | break; |
2355 | if (ppp->rcomp->decomp_init(ppp->rc_state, dp, len, | |
2356 | ppp->file.index, 0, ppp->mru, ppp->debug)) { | |
2357 | ppp->rstate |= SC_DECOMP_RUN; | |
2358 | ppp->rstate &= ~(SC_DC_ERROR | SC_DC_FERROR); | |
2359 | } | |
2360 | } else { | |
2361 | /* we will soon start sending compressed packets */ | |
cd228d54 | 2362 | if (!ppp->xc_state) |
1da177e4 LT |
2363 | break; |
2364 | if (ppp->xcomp->comp_init(ppp->xc_state, dp, len, | |
2365 | ppp->file.index, 0, ppp->debug)) | |
2366 | ppp->xstate |= SC_COMP_RUN; | |
2367 | } | |
2368 | break; | |
2369 | ||
2370 | case CCP_RESETACK: | |
2371 | /* reset the [de]compressor */ | |
2372 | if ((ppp->flags & SC_CCP_UP) == 0) | |
2373 | break; | |
2374 | if (inbound) { | |
2375 | if (ppp->rc_state && (ppp->rstate & SC_DECOMP_RUN)) { | |
2376 | ppp->rcomp->decomp_reset(ppp->rc_state); | |
2377 | ppp->rstate &= ~SC_DC_ERROR; | |
2378 | } | |
2379 | } else { | |
2380 | if (ppp->xc_state && (ppp->xstate & SC_COMP_RUN)) | |
2381 | ppp->xcomp->comp_reset(ppp->xc_state); | |
2382 | } | |
2383 | break; | |
2384 | } | |
2385 | } | |
2386 | ||
2387 | /* Free up compression resources. */ | |
2388 | static void | |
2389 | ppp_ccp_closed(struct ppp *ppp) | |
2390 | { | |
2391 | void *xstate, *rstate; | |
2392 | struct compressor *xcomp, *rcomp; | |
2393 | ||
2394 | ppp_lock(ppp); | |
2395 | ppp->flags &= ~(SC_CCP_OPEN | SC_CCP_UP); | |
2396 | ppp->xstate = 0; | |
2397 | xcomp = ppp->xcomp; | |
2398 | xstate = ppp->xc_state; | |
2399 | ppp->xc_state = NULL; | |
2400 | ppp->rstate = 0; | |
2401 | rcomp = ppp->rcomp; | |
2402 | rstate = ppp->rc_state; | |
2403 | ppp->rc_state = NULL; | |
2404 | ppp_unlock(ppp); | |
2405 | ||
2406 | if (xstate) { | |
2407 | xcomp->comp_free(xstate); | |
2408 | module_put(xcomp->owner); | |
2409 | } | |
2410 | if (rstate) { | |
2411 | rcomp->decomp_free(rstate); | |
2412 | module_put(rcomp->owner); | |
2413 | } | |
2414 | } | |
2415 | ||
2416 | /* List of compressors. */ | |
2417 | static LIST_HEAD(compressor_list); | |
2418 | static DEFINE_SPINLOCK(compressor_list_lock); | |
2419 | ||
2420 | struct compressor_entry { | |
2421 | struct list_head list; | |
2422 | struct compressor *comp; | |
2423 | }; | |
2424 | ||
2425 | static struct compressor_entry * | |
2426 | find_comp_entry(int proto) | |
2427 | { | |
2428 | struct compressor_entry *ce; | |
1da177e4 | 2429 | |
81616c5a | 2430 | list_for_each_entry(ce, &compressor_list, list) { |
1da177e4 LT |
2431 | if (ce->comp->compress_proto == proto) |
2432 | return ce; | |
2433 | } | |
2434 | return NULL; | |
2435 | } | |
2436 | ||
2437 | /* Register a compressor */ | |
2438 | int | |
2439 | ppp_register_compressor(struct compressor *cp) | |
2440 | { | |
2441 | struct compressor_entry *ce; | |
2442 | int ret; | |
2443 | spin_lock(&compressor_list_lock); | |
2444 | ret = -EEXIST; | |
cd228d54 | 2445 | if (find_comp_entry(cp->compress_proto)) |
1da177e4 LT |
2446 | goto out; |
2447 | ret = -ENOMEM; | |
2448 | ce = kmalloc(sizeof(struct compressor_entry), GFP_ATOMIC); | |
cd228d54 | 2449 | if (!ce) |
1da177e4 LT |
2450 | goto out; |
2451 | ret = 0; | |
2452 | ce->comp = cp; | |
2453 | list_add(&ce->list, &compressor_list); | |
2454 | out: | |
2455 | spin_unlock(&compressor_list_lock); | |
2456 | return ret; | |
2457 | } | |
2458 | ||
2459 | /* Unregister a compressor */ | |
2460 | void | |
2461 | ppp_unregister_compressor(struct compressor *cp) | |
2462 | { | |
2463 | struct compressor_entry *ce; | |
2464 | ||
2465 | spin_lock(&compressor_list_lock); | |
2466 | ce = find_comp_entry(cp->compress_proto); | |
cd228d54 | 2467 | if (ce && ce->comp == cp) { |
1da177e4 LT |
2468 | list_del(&ce->list); |
2469 | kfree(ce); | |
2470 | } | |
2471 | spin_unlock(&compressor_list_lock); | |
2472 | } | |
2473 | ||
2474 | /* Find a compressor. */ | |
2475 | static struct compressor * | |
2476 | find_compressor(int type) | |
2477 | { | |
2478 | struct compressor_entry *ce; | |
2479 | struct compressor *cp = NULL; | |
2480 | ||
2481 | spin_lock(&compressor_list_lock); | |
2482 | ce = find_comp_entry(type); | |
cd228d54 | 2483 | if (ce) { |
1da177e4 LT |
2484 | cp = ce->comp; |
2485 | if (!try_module_get(cp->owner)) | |
2486 | cp = NULL; | |
2487 | } | |
2488 | spin_unlock(&compressor_list_lock); | |
2489 | return cp; | |
2490 | } | |
2491 | ||
2492 | /* | |
2493 | * Miscelleneous stuff. | |
2494 | */ | |
2495 | ||
2496 | static void | |
2497 | ppp_get_stats(struct ppp *ppp, struct ppp_stats *st) | |
2498 | { | |
2499 | struct slcompress *vj = ppp->vj; | |
2500 | ||
2501 | memset(st, 0, sizeof(*st)); | |
8c0469cd PZ |
2502 | st->p.ppp_ipackets = ppp->dev->stats.rx_packets; |
2503 | st->p.ppp_ierrors = ppp->dev->stats.rx_errors; | |
2504 | st->p.ppp_ibytes = ppp->dev->stats.rx_bytes; | |
2505 | st->p.ppp_opackets = ppp->dev->stats.tx_packets; | |
2506 | st->p.ppp_oerrors = ppp->dev->stats.tx_errors; | |
2507 | st->p.ppp_obytes = ppp->dev->stats.tx_bytes; | |
cd228d54 | 2508 | if (!vj) |
1da177e4 LT |
2509 | return; |
2510 | st->vj.vjs_packets = vj->sls_o_compressed + vj->sls_o_uncompressed; | |
2511 | st->vj.vjs_compressed = vj->sls_o_compressed; | |
2512 | st->vj.vjs_searches = vj->sls_o_searches; | |
2513 | st->vj.vjs_misses = vj->sls_o_misses; | |
2514 | st->vj.vjs_errorin = vj->sls_i_error; | |
2515 | st->vj.vjs_tossed = vj->sls_i_tossed; | |
2516 | st->vj.vjs_uncompressedin = vj->sls_i_uncompressed; | |
2517 | st->vj.vjs_compressedin = vj->sls_i_compressed; | |
2518 | } | |
2519 | ||
2520 | /* | |
2521 | * Stuff for handling the lists of ppp units and channels | |
2522 | * and for initialization. | |
2523 | */ | |
2524 | ||
2525 | /* | |
2526 | * Create a new ppp interface unit. Fails if it can't allocate memory | |
2527 | * or if there is already a unit with the requested number. | |
2528 | * unit == -1 means allocate a new number. | |
2529 | */ | |
2530 | static struct ppp * | |
273ec51d | 2531 | ppp_create_interface(struct net *net, int unit, int *retp) |
1da177e4 LT |
2532 | { |
2533 | struct ppp *ppp; | |
273ec51d | 2534 | struct ppp_net *pn; |
1da177e4 LT |
2535 | struct net_device *dev = NULL; |
2536 | int ret = -ENOMEM; | |
2537 | int i; | |
2538 | ||
c8019bf3 | 2539 | dev = alloc_netdev(sizeof(struct ppp), "", ppp_setup); |
1da177e4 LT |
2540 | if (!dev) |
2541 | goto out1; | |
1da177e4 | 2542 | |
273ec51d CG |
2543 | pn = ppp_pernet(net); |
2544 | ||
c8019bf3 WC |
2545 | ppp = netdev_priv(dev); |
2546 | ppp->dev = dev; | |
1da177e4 LT |
2547 | ppp->mru = PPP_MRU; |
2548 | init_ppp_file(&ppp->file, INTERFACE); | |
2549 | ppp->file.hdrlen = PPP_HDRLEN - 2; /* don't count proto bytes */ | |
2550 | for (i = 0; i < NUM_NP; ++i) | |
2551 | ppp->npmode[i] = NPMODE_PASS; | |
2552 | INIT_LIST_HEAD(&ppp->channels); | |
2553 | spin_lock_init(&ppp->rlock); | |
2554 | spin_lock_init(&ppp->wlock); | |
2555 | #ifdef CONFIG_PPP_MULTILINK | |
2556 | ppp->minseq = -1; | |
2557 | skb_queue_head_init(&ppp->mrq); | |
2558 | #endif /* CONFIG_PPP_MULTILINK */ | |
1da177e4 | 2559 | |
273ec51d CG |
2560 | /* |
2561 | * drum roll: don't forget to set | |
2562 | * the net device is belong to | |
2563 | */ | |
2564 | dev_net_set(dev, net); | |
2565 | ||
1da177e4 | 2566 | ret = -EEXIST; |
273ec51d | 2567 | mutex_lock(&pn->all_ppp_mutex); |
7a95d267 CG |
2568 | |
2569 | if (unit < 0) { | |
273ec51d | 2570 | unit = unit_get(&pn->units_idr, ppp); |
7a95d267 CG |
2571 | if (unit < 0) { |
2572 | *retp = unit; | |
2573 | goto out2; | |
2574 | } | |
2575 | } else { | |
273ec51d | 2576 | if (unit_find(&pn->units_idr, unit)) |
7a95d267 | 2577 | goto out2; /* unit already exists */ |
85997576 CG |
2578 | /* |
2579 | * if caller need a specified unit number | |
2580 | * lets try to satisfy him, otherwise -- | |
2581 | * he should better ask us for new unit number | |
2582 | * | |
2583 | * NOTE: yes I know that returning EEXIST it's not | |
2584 | * fair but at least pppd will ask us to allocate | |
2585 | * new unit in this case so user is happy :) | |
2586 | */ | |
273ec51d | 2587 | unit = unit_set(&pn->units_idr, ppp, unit); |
85997576 | 2588 | if (unit < 0) |
7a95d267 | 2589 | goto out2; |
7a95d267 | 2590 | } |
1da177e4 LT |
2591 | |
2592 | /* Initialize the new ppp unit */ | |
2593 | ppp->file.index = unit; | |
2594 | sprintf(dev->name, "ppp%d", unit); | |
2595 | ||
2596 | ret = register_netdev(dev); | |
2597 | if (ret != 0) { | |
273ec51d | 2598 | unit_put(&pn->units_idr, unit); |
1da177e4 LT |
2599 | printk(KERN_ERR "PPP: couldn't register device %s (%d)\n", |
2600 | dev->name, ret); | |
2601 | goto out2; | |
2602 | } | |
2603 | ||
273ec51d CG |
2604 | ppp->ppp_net = net; |
2605 | ||
1da177e4 | 2606 | atomic_inc(&ppp_unit_count); |
273ec51d | 2607 | mutex_unlock(&pn->all_ppp_mutex); |
7a95d267 | 2608 | |
1da177e4 LT |
2609 | *retp = 0; |
2610 | return ppp; | |
2611 | ||
2612 | out2: | |
273ec51d | 2613 | mutex_unlock(&pn->all_ppp_mutex); |
1da177e4 LT |
2614 | free_netdev(dev); |
2615 | out1: | |
1da177e4 LT |
2616 | *retp = ret; |
2617 | return NULL; | |
2618 | } | |
2619 | ||
2620 | /* | |
2621 | * Initialize a ppp_file structure. | |
2622 | */ | |
2623 | static void | |
2624 | init_ppp_file(struct ppp_file *pf, int kind) | |
2625 | { | |
2626 | pf->kind = kind; | |
2627 | skb_queue_head_init(&pf->xq); | |
2628 | skb_queue_head_init(&pf->rq); | |
2629 | atomic_set(&pf->refcnt, 1); | |
2630 | init_waitqueue_head(&pf->rwait); | |
2631 | } | |
2632 | ||
2633 | /* | |
2634 | * Take down a ppp interface unit - called when the owning file | |
2635 | * (the one that created the unit) is closed or detached. | |
2636 | */ | |
2637 | static void ppp_shutdown_interface(struct ppp *ppp) | |
2638 | { | |
273ec51d CG |
2639 | struct ppp_net *pn; |
2640 | ||
2641 | pn = ppp_pernet(ppp->ppp_net); | |
2642 | mutex_lock(&pn->all_ppp_mutex); | |
2643 | ||
1da177e4 | 2644 | /* This will call dev_close() for us. */ |
739840d5 JC |
2645 | ppp_lock(ppp); |
2646 | if (!ppp->closing) { | |
2647 | ppp->closing = 1; | |
2648 | ppp_unlock(ppp); | |
2649 | unregister_netdev(ppp->dev); | |
2650 | } else | |
2651 | ppp_unlock(ppp); | |
2652 | ||
273ec51d | 2653 | unit_put(&pn->units_idr, ppp->file.index); |
1da177e4 LT |
2654 | ppp->file.dead = 1; |
2655 | ppp->owner = NULL; | |
2656 | wake_up_interruptible(&ppp->file.rwait); | |
273ec51d CG |
2657 | |
2658 | mutex_unlock(&pn->all_ppp_mutex); | |
1da177e4 LT |
2659 | } |
2660 | ||
2661 | /* | |
2662 | * Free the memory used by a ppp unit. This is only called once | |
2663 | * there are no channels connected to the unit and no file structs | |
2664 | * that reference the unit. | |
2665 | */ | |
2666 | static void ppp_destroy_interface(struct ppp *ppp) | |
2667 | { | |
2668 | atomic_dec(&ppp_unit_count); | |
2669 | ||
2670 | if (!ppp->file.dead || ppp->n_channels) { | |
2671 | /* "can't happen" */ | |
2672 | printk(KERN_ERR "ppp: destroying ppp struct %p but dead=%d " | |
2673 | "n_channels=%d !\n", ppp, ppp->file.dead, | |
2674 | ppp->n_channels); | |
2675 | return; | |
2676 | } | |
2677 | ||
2678 | ppp_ccp_closed(ppp); | |
2679 | if (ppp->vj) { | |
2680 | slhc_free(ppp->vj); | |
2681 | ppp->vj = NULL; | |
2682 | } | |
2683 | skb_queue_purge(&ppp->file.xq); | |
2684 | skb_queue_purge(&ppp->file.rq); | |
2685 | #ifdef CONFIG_PPP_MULTILINK | |
2686 | skb_queue_purge(&ppp->mrq); | |
2687 | #endif /* CONFIG_PPP_MULTILINK */ | |
2688 | #ifdef CONFIG_PPP_FILTER | |
96edf83c JJ |
2689 | kfree(ppp->pass_filter); |
2690 | ppp->pass_filter = NULL; | |
2691 | kfree(ppp->active_filter); | |
2692 | ppp->active_filter = NULL; | |
1da177e4 LT |
2693 | #endif /* CONFIG_PPP_FILTER */ |
2694 | ||
1d2f8c95 | 2695 | kfree_skb(ppp->xmit_pending); |
165de5b7 | 2696 | |
739840d5 | 2697 | free_netdev(ppp->dev); |
1da177e4 LT |
2698 | } |
2699 | ||
2700 | /* | |
2701 | * Locate an existing ppp unit. | |
8ed965d6 | 2702 | * The caller should have locked the all_ppp_mutex. |
1da177e4 LT |
2703 | */ |
2704 | static struct ppp * | |
273ec51d | 2705 | ppp_find_unit(struct ppp_net *pn, int unit) |
1da177e4 | 2706 | { |
273ec51d | 2707 | return unit_find(&pn->units_idr, unit); |
1da177e4 LT |
2708 | } |
2709 | ||
2710 | /* | |
2711 | * Locate an existing ppp channel. | |
2712 | * The caller should have locked the all_channels_lock. | |
2713 | * First we look in the new_channels list, then in the | |
2714 | * all_channels list. If found in the new_channels list, | |
2715 | * we move it to the all_channels list. This is for speed | |
2716 | * when we have a lot of channels in use. | |
2717 | */ | |
2718 | static struct channel * | |
273ec51d | 2719 | ppp_find_channel(struct ppp_net *pn, int unit) |
1da177e4 LT |
2720 | { |
2721 | struct channel *pch; | |
1da177e4 | 2722 | |
273ec51d | 2723 | list_for_each_entry(pch, &pn->new_channels, list) { |
1da177e4 | 2724 | if (pch->file.index == unit) { |
273ec51d | 2725 | list_move(&pch->list, &pn->all_channels); |
1da177e4 LT |
2726 | return pch; |
2727 | } | |
2728 | } | |
273ec51d CG |
2729 | |
2730 | list_for_each_entry(pch, &pn->all_channels, list) { | |
1da177e4 LT |
2731 | if (pch->file.index == unit) |
2732 | return pch; | |
2733 | } | |
273ec51d | 2734 | |
1da177e4 LT |
2735 | return NULL; |
2736 | } | |
2737 | ||
2738 | /* | |
2739 | * Connect a PPP channel to a PPP interface unit. | |
2740 | */ | |
2741 | static int | |
2742 | ppp_connect_channel(struct channel *pch, int unit) | |
2743 | { | |
2744 | struct ppp *ppp; | |
273ec51d | 2745 | struct ppp_net *pn; |
1da177e4 LT |
2746 | int ret = -ENXIO; |
2747 | int hdrlen; | |
2748 | ||
273ec51d CG |
2749 | pn = ppp_pernet(pch->chan_net); |
2750 | ||
2751 | mutex_lock(&pn->all_ppp_mutex); | |
2752 | ppp = ppp_find_unit(pn, unit); | |
cd228d54 | 2753 | if (!ppp) |
1da177e4 LT |
2754 | goto out; |
2755 | write_lock_bh(&pch->upl); | |
2756 | ret = -EINVAL; | |
cd228d54 | 2757 | if (pch->ppp) |
1da177e4 LT |
2758 | goto outl; |
2759 | ||
2760 | ppp_lock(ppp); | |
2761 | if (pch->file.hdrlen > ppp->file.hdrlen) | |
2762 | ppp->file.hdrlen = pch->file.hdrlen; | |
2763 | hdrlen = pch->file.hdrlen + 2; /* for protocol bytes */ | |
739840d5 | 2764 | if (hdrlen > ppp->dev->hard_header_len) |
1da177e4 LT |
2765 | ppp->dev->hard_header_len = hdrlen; |
2766 | list_add_tail(&pch->clist, &ppp->channels); | |
2767 | ++ppp->n_channels; | |
2768 | pch->ppp = ppp; | |
2769 | atomic_inc(&ppp->file.refcnt); | |
2770 | ppp_unlock(ppp); | |
2771 | ret = 0; | |
2772 | ||
2773 | outl: | |
2774 | write_unlock_bh(&pch->upl); | |
2775 | out: | |
273ec51d | 2776 | mutex_unlock(&pn->all_ppp_mutex); |
1da177e4 LT |
2777 | return ret; |
2778 | } | |
2779 | ||
2780 | /* | |
2781 | * Disconnect a channel from its ppp unit. | |
2782 | */ | |
2783 | static int | |
2784 | ppp_disconnect_channel(struct channel *pch) | |
2785 | { | |
2786 | struct ppp *ppp; | |
2787 | int err = -EINVAL; | |
2788 | ||
2789 | write_lock_bh(&pch->upl); | |
2790 | ppp = pch->ppp; | |
2791 | pch->ppp = NULL; | |
2792 | write_unlock_bh(&pch->upl); | |
cd228d54 | 2793 | if (ppp) { |
1da177e4 LT |
2794 | /* remove it from the ppp unit's list */ |
2795 | ppp_lock(ppp); | |
2796 | list_del(&pch->clist); | |
2797 | if (--ppp->n_channels == 0) | |
2798 | wake_up_interruptible(&ppp->file.rwait); | |
2799 | ppp_unlock(ppp); | |
2800 | if (atomic_dec_and_test(&ppp->file.refcnt)) | |
2801 | ppp_destroy_interface(ppp); | |
2802 | err = 0; | |
2803 | } | |
2804 | return err; | |
2805 | } | |
2806 | ||
2807 | /* | |
2808 | * Free up the resources used by a ppp channel. | |
2809 | */ | |
2810 | static void ppp_destroy_channel(struct channel *pch) | |
2811 | { | |
2812 | atomic_dec(&channel_count); | |
2813 | ||
2814 | if (!pch->file.dead) { | |
2815 | /* "can't happen" */ | |
2816 | printk(KERN_ERR "ppp: destroying undead channel %p !\n", | |
2817 | pch); | |
2818 | return; | |
2819 | } | |
2820 | skb_queue_purge(&pch->file.xq); | |
2821 | skb_queue_purge(&pch->file.rq); | |
2822 | kfree(pch); | |
2823 | } | |
2824 | ||
2825 | static void __exit ppp_cleanup(void) | |
2826 | { | |
2827 | /* should never happen */ | |
2828 | if (atomic_read(&ppp_unit_count) || atomic_read(&channel_count)) | |
2829 | printk(KERN_ERR "PPP: removing module but units remain!\n"); | |
68fc4fab | 2830 | unregister_chrdev(PPP_MAJOR, "ppp"); |
9a6a2a5e | 2831 | device_destroy(ppp_class, MKDEV(PPP_MAJOR, 0)); |
56b22935 | 2832 | class_destroy(ppp_class); |
741a6fa2 | 2833 | unregister_pernet_device(&ppp_net_ops); |
1da177e4 LT |
2834 | } |
2835 | ||
2836 | /* | |
7a95d267 CG |
2837 | * Units handling. Caller must protect concurrent access |
2838 | * by holding all_ppp_mutex | |
1da177e4 | 2839 | */ |
7a95d267 | 2840 | |
85997576 CG |
2841 | /* associate pointer with specified number */ |
2842 | static int unit_set(struct idr *p, void *ptr, int n) | |
2843 | { | |
2844 | int unit, err; | |
2845 | ||
2846 | again: | |
2847 | if (!idr_pre_get(p, GFP_KERNEL)) { | |
2848 | printk(KERN_ERR "PPP: No free memory for idr\n"); | |
2849 | return -ENOMEM; | |
2850 | } | |
2851 | ||
2852 | err = idr_get_new_above(p, ptr, n, &unit); | |
2853 | if (err == -EAGAIN) | |
2854 | goto again; | |
2855 | ||
2856 | if (unit != n) { | |
2857 | idr_remove(p, unit); | |
2858 | return -EINVAL; | |
2859 | } | |
2860 | ||
2861 | return unit; | |
2862 | } | |
2863 | ||
7a95d267 CG |
2864 | /* get new free unit number and associate pointer with it */ |
2865 | static int unit_get(struct idr *p, void *ptr) | |
1da177e4 | 2866 | { |
7a95d267 | 2867 | int unit, err; |
1da177e4 | 2868 | |
7a95d267 | 2869 | again: |
85997576 CG |
2870 | if (!idr_pre_get(p, GFP_KERNEL)) { |
2871 | printk(KERN_ERR "PPP: No free memory for idr\n"); | |
7a95d267 | 2872 | return -ENOMEM; |
1da177e4 | 2873 | } |
1da177e4 | 2874 | |
7a95d267 CG |
2875 | err = idr_get_new_above(p, ptr, 0, &unit); |
2876 | if (err == -EAGAIN) | |
2877 | goto again; | |
1da177e4 | 2878 | |
7a95d267 | 2879 | return unit; |
1da177e4 LT |
2880 | } |
2881 | ||
7a95d267 CG |
2882 | /* put unit number back to a pool */ |
2883 | static void unit_put(struct idr *p, int n) | |
1da177e4 | 2884 | { |
7a95d267 | 2885 | idr_remove(p, n); |
1da177e4 LT |
2886 | } |
2887 | ||
7a95d267 CG |
2888 | /* get pointer associated with the number */ |
2889 | static void *unit_find(struct idr *p, int n) | |
1da177e4 | 2890 | { |
7a95d267 | 2891 | return idr_find(p, n); |
1da177e4 LT |
2892 | } |
2893 | ||
2894 | /* Module/initialization stuff */ | |
2895 | ||
2896 | module_init(ppp_init); | |
2897 | module_exit(ppp_cleanup); | |
2898 | ||
273ec51d | 2899 | EXPORT_SYMBOL(ppp_register_net_channel); |
1da177e4 LT |
2900 | EXPORT_SYMBOL(ppp_register_channel); |
2901 | EXPORT_SYMBOL(ppp_unregister_channel); | |
2902 | EXPORT_SYMBOL(ppp_channel_index); | |
2903 | EXPORT_SYMBOL(ppp_unit_number); | |
2904 | EXPORT_SYMBOL(ppp_input); | |
2905 | EXPORT_SYMBOL(ppp_input_error); | |
2906 | EXPORT_SYMBOL(ppp_output_wakeup); | |
2907 | EXPORT_SYMBOL(ppp_register_compressor); | |
2908 | EXPORT_SYMBOL(ppp_unregister_compressor); | |
2909 | MODULE_LICENSE("GPL"); | |
2910 | MODULE_ALIAS_CHARDEV_MAJOR(PPP_MAJOR); | |
2911 | MODULE_ALIAS("/dev/ppp"); |