Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Generic PPP layer for Linux. | |
3 | * | |
4 | * Copyright 1999-2002 Paul Mackerras. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * The generic PPP layer handles the PPP network interfaces, the | |
12 | * /dev/ppp device, packet and VJ compression, and multilink. | |
13 | * It talks to PPP `channels' via the interface defined in | |
14 | * include/linux/ppp_channel.h. Channels provide the basic means for | |
15 | * sending and receiving PPP frames on some kind of communications | |
16 | * channel. | |
17 | * | |
18 | * Part of the code in this driver was inspired by the old async-only | |
19 | * PPP driver, written by Michael Callahan and Al Longyear, and | |
20 | * subsequently hacked by Paul Mackerras. | |
21 | * | |
22 | * ==FILEVERSION 20041108== | |
23 | */ | |
24 | ||
1da177e4 LT |
25 | #include <linux/module.h> |
26 | #include <linux/kernel.h> | |
27 | #include <linux/kmod.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/list.h> | |
7a95d267 | 30 | #include <linux/idr.h> |
1da177e4 LT |
31 | #include <linux/netdevice.h> |
32 | #include <linux/poll.h> | |
33 | #include <linux/ppp_defs.h> | |
34 | #include <linux/filter.h> | |
bf7daebb | 35 | #include <linux/ppp-ioctl.h> |
1da177e4 LT |
36 | #include <linux/ppp_channel.h> |
37 | #include <linux/ppp-comp.h> | |
38 | #include <linux/skbuff.h> | |
39 | #include <linux/rtnetlink.h> | |
40 | #include <linux/if_arp.h> | |
41 | #include <linux/ip.h> | |
42 | #include <linux/tcp.h> | |
43 | #include <linux/spinlock.h> | |
1da177e4 LT |
44 | #include <linux/rwsem.h> |
45 | #include <linux/stddef.h> | |
46 | #include <linux/device.h> | |
8ed965d6 | 47 | #include <linux/mutex.h> |
5a0e3ad6 | 48 | #include <linux/slab.h> |
96545aeb | 49 | #include <asm/unaligned.h> |
1da177e4 | 50 | #include <net/slhc_vj.h> |
60063497 | 51 | #include <linux/atomic.h> |
1da177e4 | 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 */ | |
1da177e4 LT |
72 | |
73 | /* | |
74 | * An instance of /dev/ppp can be associated with either a ppp | |
75 | * interface unit or a ppp channel. In both cases, file->private_data | |
76 | * points to one of these. | |
77 | */ | |
78 | struct ppp_file { | |
79 | enum { | |
80 | INTERFACE=1, CHANNEL | |
81 | } kind; | |
82 | struct sk_buff_head xq; /* pppd transmit queue */ | |
83 | struct sk_buff_head rq; /* receive queue for pppd */ | |
84 | wait_queue_head_t rwait; /* for poll on reading /dev/ppp */ | |
85 | atomic_t refcnt; /* # refs (incl /dev/ppp attached) */ | |
86 | int hdrlen; /* space to leave for headers */ | |
87 | int index; /* interface unit / channel number */ | |
88 | int dead; /* unit/channel has been shut down */ | |
89 | }; | |
90 | ||
b385a144 | 91 | #define PF_TO_X(pf, X) container_of(pf, X, file) |
1da177e4 LT |
92 | |
93 | #define PF_TO_PPP(pf) PF_TO_X(pf, struct ppp) | |
94 | #define PF_TO_CHANNEL(pf) PF_TO_X(pf, struct channel) | |
95 | ||
e51f6ff3 KG |
96 | /* |
97 | * Data structure to hold primary network stats for which | |
98 | * we want to use 64 bit storage. Other network stats | |
99 | * are stored in dev->stats of the ppp strucute. | |
100 | */ | |
101 | struct ppp_link_stats { | |
102 | u64 rx_packets; | |
103 | u64 tx_packets; | |
104 | u64 rx_bytes; | |
105 | u64 tx_bytes; | |
106 | }; | |
107 | ||
1da177e4 LT |
108 | /* |
109 | * Data structure describing one ppp unit. | |
110 | * A ppp unit corresponds to a ppp network interface device | |
111 | * and represents a multilink bundle. | |
112 | * It can have 0 or more ppp channels connected to it. | |
113 | */ | |
114 | struct ppp { | |
115 | struct ppp_file file; /* stuff for read/write/poll 0 */ | |
116 | struct file *owner; /* file that owns this unit 48 */ | |
117 | struct list_head channels; /* list of attached channels 4c */ | |
118 | int n_channels; /* how many channels are attached 54 */ | |
119 | spinlock_t rlock; /* lock for receive side 58 */ | |
120 | spinlock_t wlock; /* lock for transmit side 5c */ | |
121 | int mru; /* max receive unit 60 */ | |
122 | unsigned int flags; /* control bits 64 */ | |
123 | unsigned int xstate; /* transmit state bits 68 */ | |
124 | unsigned int rstate; /* receive state bits 6c */ | |
125 | int debug; /* debug flags 70 */ | |
126 | struct slcompress *vj; /* state for VJ header compression */ | |
127 | enum NPmode npmode[NUM_NP]; /* what to do with each net proto 78 */ | |
128 | struct sk_buff *xmit_pending; /* a packet ready to go out 88 */ | |
129 | struct compressor *xcomp; /* transmit packet compressor 8c */ | |
130 | void *xc_state; /* its internal state 90 */ | |
131 | struct compressor *rcomp; /* receive decompressor 94 */ | |
132 | void *rc_state; /* its internal state 98 */ | |
133 | unsigned long last_xmit; /* jiffies when last pkt sent 9c */ | |
134 | unsigned long last_recv; /* jiffies when last pkt rcvd a0 */ | |
135 | struct net_device *dev; /* network interface device a4 */ | |
739840d5 | 136 | int closing; /* is device closing down? a8 */ |
1da177e4 LT |
137 | #ifdef CONFIG_PPP_MULTILINK |
138 | int nxchan; /* next channel to send something on */ | |
139 | u32 nxseq; /* next sequence number to send */ | |
140 | int mrru; /* MP: max reconst. receive unit */ | |
141 | u32 nextseq; /* MP: seq no of next packet */ | |
142 | u32 minseq; /* MP: min of most recent seqnos */ | |
143 | struct sk_buff_head mrq; /* MP: receive reconstruction queue */ | |
144 | #endif /* CONFIG_PPP_MULTILINK */ | |
1da177e4 | 145 | #ifdef CONFIG_PPP_FILTER |
7ae457c1 AS |
146 | struct bpf_prog *pass_filter; /* filter for packets to pass */ |
147 | struct bpf_prog *active_filter; /* filter for pkts to reset idle */ | |
1da177e4 | 148 | #endif /* CONFIG_PPP_FILTER */ |
273ec51d | 149 | struct net *ppp_net; /* the net we belong to */ |
e51f6ff3 | 150 | struct ppp_link_stats stats64; /* 64 bit network stats */ |
1da177e4 LT |
151 | }; |
152 | ||
153 | /* | |
154 | * Bits in flags: SC_NO_TCP_CCID, SC_CCP_OPEN, SC_CCP_UP, SC_LOOP_TRAFFIC, | |
b3f9b92a MD |
155 | * SC_MULTILINK, SC_MP_SHORTSEQ, SC_MP_XSHORTSEQ, SC_COMP_TCP, SC_REJ_COMP_TCP, |
156 | * SC_MUST_COMP | |
1da177e4 LT |
157 | * Bits in rstate: SC_DECOMP_RUN, SC_DC_ERROR, SC_DC_FERROR. |
158 | * Bits in xstate: SC_COMP_RUN | |
159 | */ | |
160 | #define SC_FLAG_BITS (SC_NO_TCP_CCID|SC_CCP_OPEN|SC_CCP_UP|SC_LOOP_TRAFFIC \ | |
161 | |SC_MULTILINK|SC_MP_SHORTSEQ|SC_MP_XSHORTSEQ \ | |
b3f9b92a | 162 | |SC_COMP_TCP|SC_REJ_COMP_TCP|SC_MUST_COMP) |
1da177e4 LT |
163 | |
164 | /* | |
165 | * Private data structure for each channel. | |
166 | * This includes the data structure used for multilink. | |
167 | */ | |
168 | struct channel { | |
169 | struct ppp_file file; /* stuff for read/write/poll */ | |
170 | struct list_head list; /* link in all/new_channels list */ | |
171 | struct ppp_channel *chan; /* public channel data structure */ | |
172 | struct rw_semaphore chan_sem; /* protects `chan' during chan ioctl */ | |
173 | spinlock_t downl; /* protects `chan', file.xq dequeue */ | |
174 | struct ppp *ppp; /* ppp unit we're connected to */ | |
273ec51d | 175 | struct net *chan_net; /* the net channel belongs to */ |
1da177e4 LT |
176 | struct list_head clist; /* link in list of channels per unit */ |
177 | rwlock_t upl; /* protects `ppp' */ | |
178 | #ifdef CONFIG_PPP_MULTILINK | |
179 | u8 avail; /* flag used in multilink stuff */ | |
180 | u8 had_frag; /* >= 1 fragments have been sent */ | |
181 | u32 lastseq; /* MP: last sequence # received */ | |
fa44a73c | 182 | int speed; /* speed of the corresponding ppp channel*/ |
1da177e4 LT |
183 | #endif /* CONFIG_PPP_MULTILINK */ |
184 | }; | |
185 | ||
186 | /* | |
187 | * SMP locking issues: | |
188 | * Both the ppp.rlock and ppp.wlock locks protect the ppp.channels | |
189 | * list and the ppp.n_channels field, you need to take both locks | |
190 | * before you modify them. | |
191 | * The lock ordering is: channel.upl -> ppp.wlock -> ppp.rlock -> | |
192 | * channel.downl. | |
193 | */ | |
194 | ||
15fd0cd9 | 195 | static DEFINE_MUTEX(ppp_mutex); |
1da177e4 | 196 | static atomic_t ppp_unit_count = ATOMIC_INIT(0); |
1da177e4 LT |
197 | static atomic_t channel_count = ATOMIC_INIT(0); |
198 | ||
273ec51d | 199 | /* per-net private data for this module */ |
f99189b1 | 200 | static int ppp_net_id __read_mostly; |
273ec51d CG |
201 | struct ppp_net { |
202 | /* units to ppp mapping */ | |
203 | struct idr units_idr; | |
204 | ||
205 | /* | |
206 | * all_ppp_mutex protects the units_idr mapping. | |
207 | * It also ensures that finding a ppp unit in the units_idr | |
208 | * map and updating its file.refcnt field is atomic. | |
209 | */ | |
210 | struct mutex all_ppp_mutex; | |
211 | ||
212 | /* channels */ | |
213 | struct list_head all_channels; | |
214 | struct list_head new_channels; | |
215 | int last_channel_index; | |
216 | ||
217 | /* | |
218 | * all_channels_lock protects all_channels and | |
219 | * last_channel_index, and the atomicity of find | |
220 | * a channel and updating its file.refcnt field. | |
221 | */ | |
222 | spinlock_t all_channels_lock; | |
223 | }; | |
224 | ||
1da177e4 | 225 | /* Get the PPP protocol number from a skb */ |
96545aeb | 226 | #define PPP_PROTO(skb) get_unaligned_be16((skb)->data) |
1da177e4 LT |
227 | |
228 | /* We limit the length of ppp->file.rq to this (arbitrary) value */ | |
229 | #define PPP_MAX_RQLEN 32 | |
230 | ||
231 | /* | |
232 | * Maximum number of multilink fragments queued up. | |
233 | * This has to be large enough to cope with the maximum latency of | |
234 | * the slowest channel relative to the others. Strictly it should | |
235 | * depend on the number of channels and their characteristics. | |
236 | */ | |
237 | #define PPP_MP_MAX_QLEN 128 | |
238 | ||
239 | /* Multilink header bits. */ | |
240 | #define B 0x80 /* this fragment begins a packet */ | |
241 | #define E 0x40 /* this fragment ends a packet */ | |
242 | ||
243 | /* Compare multilink sequence numbers (assumed to be 32 bits wide) */ | |
244 | #define seq_before(a, b) ((s32)((a) - (b)) < 0) | |
245 | #define seq_after(a, b) ((s32)((a) - (b)) > 0) | |
246 | ||
247 | /* Prototypes. */ | |
273ec51d CG |
248 | static int ppp_unattached_ioctl(struct net *net, struct ppp_file *pf, |
249 | struct file *file, unsigned int cmd, unsigned long arg); | |
9a5d2bd9 | 250 | static void ppp_xmit_process(struct ppp *ppp); |
1da177e4 LT |
251 | static void ppp_send_frame(struct ppp *ppp, struct sk_buff *skb); |
252 | static void ppp_push(struct ppp *ppp); | |
253 | static void ppp_channel_push(struct channel *pch); | |
254 | static void ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, | |
255 | struct channel *pch); | |
256 | static void ppp_receive_error(struct ppp *ppp); | |
257 | static void ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb); | |
258 | static struct sk_buff *ppp_decompress_frame(struct ppp *ppp, | |
259 | struct sk_buff *skb); | |
260 | #ifdef CONFIG_PPP_MULTILINK | |
261 | static void ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, | |
262 | struct channel *pch); | |
263 | static void ppp_mp_insert(struct ppp *ppp, struct sk_buff *skb); | |
264 | static struct sk_buff *ppp_mp_reconstruct(struct ppp *ppp); | |
265 | static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb); | |
266 | #endif /* CONFIG_PPP_MULTILINK */ | |
267 | static int ppp_set_compress(struct ppp *ppp, unsigned long arg); | |
268 | static void ppp_ccp_peek(struct ppp *ppp, struct sk_buff *skb, int inbound); | |
269 | static void ppp_ccp_closed(struct ppp *ppp); | |
270 | static struct compressor *find_compressor(int type); | |
271 | static void ppp_get_stats(struct ppp *ppp, struct ppp_stats *st); | |
273ec51d | 272 | static struct ppp *ppp_create_interface(struct net *net, int unit, int *retp); |
1da177e4 LT |
273 | static void init_ppp_file(struct ppp_file *pf, int kind); |
274 | static void ppp_shutdown_interface(struct ppp *ppp); | |
275 | static void ppp_destroy_interface(struct ppp *ppp); | |
273ec51d CG |
276 | static struct ppp *ppp_find_unit(struct ppp_net *pn, int unit); |
277 | static struct channel *ppp_find_channel(struct ppp_net *pn, int unit); | |
1da177e4 LT |
278 | static int ppp_connect_channel(struct channel *pch, int unit); |
279 | static int ppp_disconnect_channel(struct channel *pch); | |
280 | static void ppp_destroy_channel(struct channel *pch); | |
7a95d267 | 281 | static int unit_get(struct idr *p, void *ptr); |
85997576 | 282 | static int unit_set(struct idr *p, void *ptr, int n); |
7a95d267 CG |
283 | static void unit_put(struct idr *p, int n); |
284 | static void *unit_find(struct idr *p, int n); | |
1da177e4 | 285 | |
56b22935 | 286 | static struct class *ppp_class; |
1da177e4 | 287 | |
273ec51d CG |
288 | /* per net-namespace data */ |
289 | static inline struct ppp_net *ppp_pernet(struct net *net) | |
290 | { | |
291 | BUG_ON(!net); | |
292 | ||
293 | return net_generic(net, ppp_net_id); | |
294 | } | |
295 | ||
1da177e4 LT |
296 | /* Translates a PPP protocol number to a NP index (NP == network protocol) */ |
297 | static inline int proto_to_npindex(int proto) | |
298 | { | |
299 | switch (proto) { | |
300 | case PPP_IP: | |
301 | return NP_IP; | |
302 | case PPP_IPV6: | |
303 | return NP_IPV6; | |
304 | case PPP_IPX: | |
305 | return NP_IPX; | |
306 | case PPP_AT: | |
307 | return NP_AT; | |
308 | case PPP_MPLS_UC: | |
309 | return NP_MPLS_UC; | |
310 | case PPP_MPLS_MC: | |
311 | return NP_MPLS_MC; | |
312 | } | |
313 | return -EINVAL; | |
314 | } | |
315 | ||
316 | /* Translates an NP index into a PPP protocol number */ | |
317 | static const int npindex_to_proto[NUM_NP] = { | |
318 | PPP_IP, | |
319 | PPP_IPV6, | |
320 | PPP_IPX, | |
321 | PPP_AT, | |
322 | PPP_MPLS_UC, | |
323 | PPP_MPLS_MC, | |
324 | }; | |
6aa20a22 | 325 | |
1da177e4 LT |
326 | /* Translates an ethertype into an NP index */ |
327 | static inline int ethertype_to_npindex(int ethertype) | |
328 | { | |
329 | switch (ethertype) { | |
330 | case ETH_P_IP: | |
331 | return NP_IP; | |
332 | case ETH_P_IPV6: | |
333 | return NP_IPV6; | |
334 | case ETH_P_IPX: | |
335 | return NP_IPX; | |
336 | case ETH_P_PPPTALK: | |
337 | case ETH_P_ATALK: | |
338 | return NP_AT; | |
339 | case ETH_P_MPLS_UC: | |
340 | return NP_MPLS_UC; | |
341 | case ETH_P_MPLS_MC: | |
342 | return NP_MPLS_MC; | |
343 | } | |
344 | return -1; | |
345 | } | |
346 | ||
347 | /* Translates an NP index into an ethertype */ | |
348 | static const int npindex_to_ethertype[NUM_NP] = { | |
349 | ETH_P_IP, | |
350 | ETH_P_IPV6, | |
351 | ETH_P_IPX, | |
352 | ETH_P_PPPTALK, | |
353 | ETH_P_MPLS_UC, | |
354 | ETH_P_MPLS_MC, | |
355 | }; | |
356 | ||
357 | /* | |
358 | * Locking shorthand. | |
359 | */ | |
360 | #define ppp_xmit_lock(ppp) spin_lock_bh(&(ppp)->wlock) | |
361 | #define ppp_xmit_unlock(ppp) spin_unlock_bh(&(ppp)->wlock) | |
362 | #define ppp_recv_lock(ppp) spin_lock_bh(&(ppp)->rlock) | |
363 | #define ppp_recv_unlock(ppp) spin_unlock_bh(&(ppp)->rlock) | |
364 | #define ppp_lock(ppp) do { ppp_xmit_lock(ppp); \ | |
365 | ppp_recv_lock(ppp); } while (0) | |
366 | #define ppp_unlock(ppp) do { ppp_recv_unlock(ppp); \ | |
367 | ppp_xmit_unlock(ppp); } while (0) | |
368 | ||
369 | /* | |
370 | * /dev/ppp device routines. | |
371 | * The /dev/ppp device is used by pppd to control the ppp unit. | |
372 | * It supports the read, write, ioctl and poll functions. | |
373 | * Open instances of /dev/ppp can be in one of three states: | |
374 | * unattached, attached to a ppp unit, or attached to a ppp channel. | |
375 | */ | |
376 | static int ppp_open(struct inode *inode, struct file *file) | |
377 | { | |
378 | /* | |
379 | * This could (should?) be enforced by the permissions on /dev/ppp. | |
380 | */ | |
381 | if (!capable(CAP_NET_ADMIN)) | |
382 | return -EPERM; | |
383 | return 0; | |
384 | } | |
385 | ||
f3ff8a4d | 386 | static int ppp_release(struct inode *unused, struct file *file) |
1da177e4 LT |
387 | { |
388 | struct ppp_file *pf = file->private_data; | |
389 | struct ppp *ppp; | |
390 | ||
cd228d54 | 391 | if (pf) { |
1da177e4 LT |
392 | file->private_data = NULL; |
393 | if (pf->kind == INTERFACE) { | |
394 | ppp = PF_TO_PPP(pf); | |
395 | if (file == ppp->owner) | |
396 | ppp_shutdown_interface(ppp); | |
397 | } | |
398 | if (atomic_dec_and_test(&pf->refcnt)) { | |
399 | switch (pf->kind) { | |
400 | case INTERFACE: | |
401 | ppp_destroy_interface(PF_TO_PPP(pf)); | |
402 | break; | |
403 | case CHANNEL: | |
404 | ppp_destroy_channel(PF_TO_CHANNEL(pf)); | |
405 | break; | |
406 | } | |
407 | } | |
408 | } | |
409 | return 0; | |
410 | } | |
411 | ||
412 | static ssize_t ppp_read(struct file *file, char __user *buf, | |
413 | size_t count, loff_t *ppos) | |
414 | { | |
415 | struct ppp_file *pf = file->private_data; | |
416 | DECLARE_WAITQUEUE(wait, current); | |
417 | ssize_t ret; | |
418 | struct sk_buff *skb = NULL; | |
19937d04 | 419 | struct iovec iov; |
1da177e4 LT |
420 | |
421 | ret = count; | |
422 | ||
cd228d54 | 423 | if (!pf) |
1da177e4 LT |
424 | return -ENXIO; |
425 | add_wait_queue(&pf->rwait, &wait); | |
426 | for (;;) { | |
427 | set_current_state(TASK_INTERRUPTIBLE); | |
428 | skb = skb_dequeue(&pf->rq); | |
429 | if (skb) | |
430 | break; | |
431 | ret = 0; | |
432 | if (pf->dead) | |
433 | break; | |
434 | if (pf->kind == INTERFACE) { | |
435 | /* | |
436 | * Return 0 (EOF) on an interface that has no | |
437 | * channels connected, unless it is looping | |
438 | * network traffic (demand mode). | |
439 | */ | |
440 | struct ppp *ppp = PF_TO_PPP(pf); | |
8e95a202 JP |
441 | if (ppp->n_channels == 0 && |
442 | (ppp->flags & SC_LOOP_TRAFFIC) == 0) | |
1da177e4 LT |
443 | break; |
444 | } | |
445 | ret = -EAGAIN; | |
446 | if (file->f_flags & O_NONBLOCK) | |
447 | break; | |
448 | ret = -ERESTARTSYS; | |
449 | if (signal_pending(current)) | |
450 | break; | |
451 | schedule(); | |
452 | } | |
453 | set_current_state(TASK_RUNNING); | |
454 | remove_wait_queue(&pf->rwait, &wait); | |
455 | ||
cd228d54 | 456 | if (!skb) |
1da177e4 LT |
457 | goto out; |
458 | ||
459 | ret = -EOVERFLOW; | |
460 | if (skb->len > count) | |
461 | goto outf; | |
462 | ret = -EFAULT; | |
19937d04 SA |
463 | iov.iov_base = buf; |
464 | iov.iov_len = count; | |
465 | if (skb_copy_datagram_iovec(skb, 0, &iov, skb->len)) | |
1da177e4 LT |
466 | goto outf; |
467 | ret = skb->len; | |
468 | ||
469 | outf: | |
470 | kfree_skb(skb); | |
471 | out: | |
472 | return ret; | |
473 | } | |
474 | ||
475 | static ssize_t ppp_write(struct file *file, const char __user *buf, | |
476 | size_t count, loff_t *ppos) | |
477 | { | |
478 | struct ppp_file *pf = file->private_data; | |
479 | struct sk_buff *skb; | |
480 | ssize_t ret; | |
481 | ||
cd228d54 | 482 | if (!pf) |
1da177e4 LT |
483 | return -ENXIO; |
484 | ret = -ENOMEM; | |
485 | skb = alloc_skb(count + pf->hdrlen, GFP_KERNEL); | |
cd228d54 | 486 | if (!skb) |
1da177e4 LT |
487 | goto out; |
488 | skb_reserve(skb, pf->hdrlen); | |
489 | ret = -EFAULT; | |
490 | if (copy_from_user(skb_put(skb, count), buf, count)) { | |
491 | kfree_skb(skb); | |
492 | goto out; | |
493 | } | |
494 | ||
495 | skb_queue_tail(&pf->xq, skb); | |
496 | ||
497 | switch (pf->kind) { | |
498 | case INTERFACE: | |
499 | ppp_xmit_process(PF_TO_PPP(pf)); | |
500 | break; | |
501 | case CHANNEL: | |
502 | ppp_channel_push(PF_TO_CHANNEL(pf)); | |
503 | break; | |
504 | } | |
505 | ||
506 | ret = count; | |
507 | ||
508 | out: | |
509 | return ret; | |
510 | } | |
511 | ||
512 | /* No kernel lock - fine */ | |
513 | static unsigned int ppp_poll(struct file *file, poll_table *wait) | |
514 | { | |
515 | struct ppp_file *pf = file->private_data; | |
516 | unsigned int mask; | |
517 | ||
cd228d54 | 518 | if (!pf) |
1da177e4 LT |
519 | return 0; |
520 | poll_wait(file, &pf->rwait, wait); | |
521 | mask = POLLOUT | POLLWRNORM; | |
cd228d54 | 522 | if (skb_peek(&pf->rq)) |
1da177e4 LT |
523 | mask |= POLLIN | POLLRDNORM; |
524 | if (pf->dead) | |
525 | mask |= POLLHUP; | |
526 | else if (pf->kind == INTERFACE) { | |
527 | /* see comment in ppp_read */ | |
528 | struct ppp *ppp = PF_TO_PPP(pf); | |
8e95a202 JP |
529 | if (ppp->n_channels == 0 && |
530 | (ppp->flags & SC_LOOP_TRAFFIC) == 0) | |
1da177e4 LT |
531 | mask |= POLLIN | POLLRDNORM; |
532 | } | |
533 | ||
534 | return mask; | |
535 | } | |
536 | ||
537 | #ifdef CONFIG_PPP_FILTER | |
538 | static int get_filter(void __user *arg, struct sock_filter **p) | |
539 | { | |
540 | struct sock_fprog uprog; | |
541 | struct sock_filter *code = NULL; | |
3916a319 | 542 | int len; |
1da177e4 LT |
543 | |
544 | if (copy_from_user(&uprog, arg, sizeof(uprog))) | |
545 | return -EFAULT; | |
546 | ||
1da177e4 LT |
547 | if (!uprog.len) { |
548 | *p = NULL; | |
549 | return 0; | |
550 | } | |
551 | ||
552 | len = uprog.len * sizeof(struct sock_filter); | |
b23d00e9 JL |
553 | code = memdup_user(uprog.filter, len); |
554 | if (IS_ERR(code)) | |
555 | return PTR_ERR(code); | |
1da177e4 | 556 | |
1da177e4 LT |
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; | |
15fd0cd9 | 591 | mutex_lock(&ppp_mutex); |
1da177e4 LT |
592 | if (pf->kind == INTERFACE) { |
593 | ppp = PF_TO_PPP(pf); | |
594 | if (file == ppp->owner) | |
595 | ppp_shutdown_interface(ppp); | |
596 | } | |
24dff96a | 597 | if (atomic_long_read(&file->f_count) < 2) { |
f3ff8a4d | 598 | ppp_release(NULL, file); |
1da177e4 LT |
599 | err = 0; |
600 | } else | |
b48f8c23 DM |
601 | pr_warn("PPPIOCDETACH file->f_count=%ld\n", |
602 | atomic_long_read(&file->f_count)); | |
15fd0cd9 | 603 | mutex_unlock(&ppp_mutex); |
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 | ||
15fd0cd9 | 611 | mutex_lock(&ppp_mutex); |
f3ff8a4d AC |
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 | } | |
15fd0cd9 | 633 | mutex_unlock(&ppp_mutex); |
1da177e4 LT |
634 | return err; |
635 | } | |
636 | ||
637 | if (pf->kind != INTERFACE) { | |
638 | /* can't happen */ | |
b48f8c23 | 639 | pr_err("PPP: not interface or channel??\n"); |
1da177e4 LT |
640 | return -EINVAL; |
641 | } | |
642 | ||
15fd0cd9 | 643 | mutex_lock(&ppp_mutex); |
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; | |
a9f559c3 | 658 | #ifdef CONFIG_PPP_MULTILINK |
d762d038 CS |
659 | if (!(ppp->flags & SC_MULTILINK) && (val & SC_MULTILINK)) |
660 | ppp->nextseq = 0; | |
a9f559c3 | 661 | #endif |
1da177e4 LT |
662 | ppp->flags = val & SC_FLAG_BITS; |
663 | ppp_unlock(ppp); | |
664 | if (cflags & SC_CCP_OPEN) | |
665 | ppp_ccp_closed(ppp); | |
666 | err = 0; | |
667 | break; | |
668 | ||
669 | case PPPIOCGFLAGS: | |
670 | val = ppp->flags | ppp->xstate | ppp->rstate; | |
671 | if (put_user(val, p)) | |
672 | break; | |
673 | err = 0; | |
674 | break; | |
675 | ||
676 | case PPPIOCSCOMPRESS: | |
677 | err = ppp_set_compress(ppp, arg); | |
678 | break; | |
679 | ||
680 | case PPPIOCGUNIT: | |
681 | if (put_user(ppp->file.index, p)) | |
682 | break; | |
683 | err = 0; | |
684 | break; | |
685 | ||
686 | case PPPIOCSDEBUG: | |
687 | if (get_user(val, p)) | |
688 | break; | |
689 | ppp->debug = val; | |
690 | err = 0; | |
691 | break; | |
692 | ||
693 | case PPPIOCGDEBUG: | |
694 | if (put_user(ppp->debug, p)) | |
695 | break; | |
696 | err = 0; | |
697 | break; | |
698 | ||
699 | case PPPIOCGIDLE: | |
700 | idle.xmit_idle = (jiffies - ppp->last_xmit) / HZ; | |
701 | idle.recv_idle = (jiffies - ppp->last_recv) / HZ; | |
702 | if (copy_to_user(argp, &idle, sizeof(idle))) | |
703 | break; | |
704 | err = 0; | |
705 | break; | |
706 | ||
707 | case PPPIOCSMAXCID: | |
708 | if (get_user(val, p)) | |
709 | break; | |
710 | val2 = 15; | |
711 | if ((val >> 16) != 0) { | |
712 | val2 = val >> 16; | |
713 | val &= 0xffff; | |
714 | } | |
715 | vj = slhc_init(val2+1, val+1); | |
cd228d54 | 716 | if (!vj) { |
b48f8c23 DM |
717 | netdev_err(ppp->dev, |
718 | "PPP: no memory (VJ compressor)\n"); | |
1da177e4 LT |
719 | err = -ENOMEM; |
720 | break; | |
721 | } | |
722 | ppp_lock(ppp); | |
cd228d54 | 723 | if (ppp->vj) |
1da177e4 LT |
724 | slhc_free(ppp->vj); |
725 | ppp->vj = vj; | |
726 | ppp_unlock(ppp); | |
727 | err = 0; | |
728 | break; | |
729 | ||
730 | case PPPIOCGNPMODE: | |
731 | case PPPIOCSNPMODE: | |
732 | if (copy_from_user(&npi, argp, sizeof(npi))) | |
733 | break; | |
734 | err = proto_to_npindex(npi.protocol); | |
735 | if (err < 0) | |
736 | break; | |
737 | i = err; | |
738 | if (cmd == PPPIOCGNPMODE) { | |
739 | err = -EFAULT; | |
740 | npi.mode = ppp->npmode[i]; | |
741 | if (copy_to_user(argp, &npi, sizeof(npi))) | |
742 | break; | |
743 | } else { | |
744 | ppp->npmode[i] = npi.mode; | |
745 | /* we may be able to transmit more packets now (??) */ | |
746 | netif_wake_queue(ppp->dev); | |
747 | } | |
748 | err = 0; | |
749 | break; | |
750 | ||
751 | #ifdef CONFIG_PPP_FILTER | |
752 | case PPPIOCSPASS: | |
753 | { | |
754 | struct sock_filter *code; | |
568f194e | 755 | |
1da177e4 LT |
756 | err = get_filter(argp, &code); |
757 | if (err >= 0) { | |
5748eb8f | 758 | struct bpf_prog *pass_filter = NULL; |
b1fcd35c | 759 | struct sock_fprog_kern fprog = { |
568f194e DB |
760 | .len = err, |
761 | .filter = code, | |
762 | }; | |
763 | ||
5748eb8f TI |
764 | err = 0; |
765 | if (fprog.filter) | |
766 | err = bpf_prog_create(&pass_filter, &fprog); | |
767 | if (!err) { | |
768 | ppp_lock(ppp); | |
769 | if (ppp->pass_filter) | |
770 | bpf_prog_destroy(ppp->pass_filter); | |
771 | ppp->pass_filter = pass_filter; | |
772 | ppp_unlock(ppp); | |
cc25eaae | 773 | } |
568f194e | 774 | kfree(code); |
1da177e4 LT |
775 | } |
776 | break; | |
777 | } | |
778 | case PPPIOCSACTIVE: | |
779 | { | |
780 | struct sock_filter *code; | |
568f194e | 781 | |
1da177e4 LT |
782 | err = get_filter(argp, &code); |
783 | if (err >= 0) { | |
5748eb8f | 784 | struct bpf_prog *active_filter = NULL; |
b1fcd35c | 785 | struct sock_fprog_kern fprog = { |
568f194e DB |
786 | .len = err, |
787 | .filter = code, | |
788 | }; | |
789 | ||
5748eb8f TI |
790 | err = 0; |
791 | if (fprog.filter) | |
792 | err = bpf_prog_create(&active_filter, &fprog); | |
793 | if (!err) { | |
794 | ppp_lock(ppp); | |
795 | if (ppp->active_filter) | |
796 | bpf_prog_destroy(ppp->active_filter); | |
797 | ppp->active_filter = active_filter; | |
798 | ppp_unlock(ppp); | |
cc25eaae | 799 | } |
568f194e | 800 | kfree(code); |
1da177e4 LT |
801 | } |
802 | break; | |
803 | } | |
804 | #endif /* CONFIG_PPP_FILTER */ | |
805 | ||
806 | #ifdef CONFIG_PPP_MULTILINK | |
807 | case PPPIOCSMRRU: | |
808 | if (get_user(val, p)) | |
809 | break; | |
810 | ppp_recv_lock(ppp); | |
811 | ppp->mrru = val; | |
812 | ppp_recv_unlock(ppp); | |
813 | err = 0; | |
814 | break; | |
815 | #endif /* CONFIG_PPP_MULTILINK */ | |
816 | ||
817 | default: | |
818 | err = -ENOTTY; | |
819 | } | |
15fd0cd9 | 820 | mutex_unlock(&ppp_mutex); |
1da177e4 LT |
821 | return err; |
822 | } | |
823 | ||
273ec51d CG |
824 | static int ppp_unattached_ioctl(struct net *net, struct ppp_file *pf, |
825 | struct file *file, unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
826 | { |
827 | int unit, err = -EFAULT; | |
828 | struct ppp *ppp; | |
829 | struct channel *chan; | |
273ec51d | 830 | struct ppp_net *pn; |
1da177e4 LT |
831 | int __user *p = (int __user *)arg; |
832 | ||
15fd0cd9 | 833 | mutex_lock(&ppp_mutex); |
1da177e4 LT |
834 | switch (cmd) { |
835 | case PPPIOCNEWUNIT: | |
836 | /* Create a new ppp unit */ | |
837 | if (get_user(unit, p)) | |
838 | break; | |
273ec51d | 839 | ppp = ppp_create_interface(net, unit, &err); |
cd228d54 | 840 | if (!ppp) |
1da177e4 LT |
841 | break; |
842 | file->private_data = &ppp->file; | |
843 | ppp->owner = file; | |
844 | err = -EFAULT; | |
845 | if (put_user(ppp->file.index, p)) | |
846 | break; | |
847 | err = 0; | |
848 | break; | |
849 | ||
850 | case PPPIOCATTACH: | |
851 | /* Attach to an existing ppp unit */ | |
852 | if (get_user(unit, p)) | |
853 | break; | |
1da177e4 | 854 | err = -ENXIO; |
273ec51d CG |
855 | pn = ppp_pernet(net); |
856 | mutex_lock(&pn->all_ppp_mutex); | |
857 | ppp = ppp_find_unit(pn, unit); | |
cd228d54 | 858 | if (ppp) { |
1da177e4 LT |
859 | atomic_inc(&ppp->file.refcnt); |
860 | file->private_data = &ppp->file; | |
861 | err = 0; | |
862 | } | |
273ec51d | 863 | mutex_unlock(&pn->all_ppp_mutex); |
1da177e4 LT |
864 | break; |
865 | ||
866 | case PPPIOCATTCHAN: | |
867 | if (get_user(unit, p)) | |
868 | break; | |
1da177e4 | 869 | err = -ENXIO; |
273ec51d CG |
870 | pn = ppp_pernet(net); |
871 | spin_lock_bh(&pn->all_channels_lock); | |
872 | chan = ppp_find_channel(pn, unit); | |
cd228d54 | 873 | if (chan) { |
1da177e4 LT |
874 | atomic_inc(&chan->file.refcnt); |
875 | file->private_data = &chan->file; | |
876 | err = 0; | |
877 | } | |
273ec51d | 878 | spin_unlock_bh(&pn->all_channels_lock); |
1da177e4 LT |
879 | break; |
880 | ||
881 | default: | |
882 | err = -ENOTTY; | |
883 | } | |
15fd0cd9 | 884 | mutex_unlock(&ppp_mutex); |
1da177e4 LT |
885 | return err; |
886 | } | |
887 | ||
d54b1fdb | 888 | static const struct file_operations ppp_device_fops = { |
1da177e4 LT |
889 | .owner = THIS_MODULE, |
890 | .read = ppp_read, | |
891 | .write = ppp_write, | |
892 | .poll = ppp_poll, | |
f3ff8a4d | 893 | .unlocked_ioctl = ppp_ioctl, |
1da177e4 | 894 | .open = ppp_open, |
6038f373 AB |
895 | .release = ppp_release, |
896 | .llseek = noop_llseek, | |
1da177e4 LT |
897 | }; |
898 | ||
273ec51d CG |
899 | static __net_init int ppp_init_net(struct net *net) |
900 | { | |
741a6fa2 | 901 | struct ppp_net *pn = net_generic(net, ppp_net_id); |
273ec51d CG |
902 | |
903 | idr_init(&pn->units_idr); | |
904 | mutex_init(&pn->all_ppp_mutex); | |
905 | ||
906 | INIT_LIST_HEAD(&pn->all_channels); | |
907 | INIT_LIST_HEAD(&pn->new_channels); | |
908 | ||
909 | spin_lock_init(&pn->all_channels_lock); | |
910 | ||
273ec51d CG |
911 | return 0; |
912 | } | |
913 | ||
914 | static __net_exit void ppp_exit_net(struct net *net) | |
915 | { | |
741a6fa2 | 916 | struct ppp_net *pn = net_generic(net, ppp_net_id); |
273ec51d | 917 | |
273ec51d | 918 | idr_destroy(&pn->units_idr); |
273ec51d CG |
919 | } |
920 | ||
0012985d | 921 | static struct pernet_operations ppp_net_ops = { |
273ec51d CG |
922 | .init = ppp_init_net, |
923 | .exit = ppp_exit_net, | |
741a6fa2 EB |
924 | .id = &ppp_net_id, |
925 | .size = sizeof(struct ppp_net), | |
273ec51d CG |
926 | }; |
927 | ||
1da177e4 LT |
928 | #define PPP_MAJOR 108 |
929 | ||
930 | /* Called at boot time if ppp is compiled into the kernel, | |
931 | or at module load time (from init_module) if compiled as a module. */ | |
932 | static int __init ppp_init(void) | |
933 | { | |
934 | int err; | |
935 | ||
b48f8c23 | 936 | pr_info("PPP generic driver version " PPP_VERSION "\n"); |
273ec51d | 937 | |
741a6fa2 | 938 | err = register_pernet_device(&ppp_net_ops); |
273ec51d | 939 | if (err) { |
b48f8c23 | 940 | pr_err("failed to register PPP pernet device (%d)\n", err); |
273ec51d | 941 | goto out; |
1da177e4 LT |
942 | } |
943 | ||
273ec51d CG |
944 | err = register_chrdev(PPP_MAJOR, "ppp", &ppp_device_fops); |
945 | if (err) { | |
b48f8c23 | 946 | pr_err("failed to register PPP device (%d)\n", err); |
273ec51d CG |
947 | goto out_net; |
948 | } | |
949 | ||
950 | ppp_class = class_create(THIS_MODULE, "ppp"); | |
951 | if (IS_ERR(ppp_class)) { | |
952 | err = PTR_ERR(ppp_class); | |
953 | goto out_chrdev; | |
954 | } | |
955 | ||
956 | /* not a big deal if we fail here :-) */ | |
957 | device_create(ppp_class, NULL, MKDEV(PPP_MAJOR, 0), NULL, "ppp"); | |
958 | ||
959 | return 0; | |
1da177e4 | 960 | |
1da177e4 LT |
961 | out_chrdev: |
962 | unregister_chrdev(PPP_MAJOR, "ppp"); | |
273ec51d | 963 | out_net: |
741a6fa2 | 964 | unregister_pernet_device(&ppp_net_ops); |
273ec51d CG |
965 | out: |
966 | return err; | |
1da177e4 LT |
967 | } |
968 | ||
969 | /* | |
970 | * Network interface unit routines. | |
971 | */ | |
424efe9c | 972 | static netdev_tx_t |
1da177e4 LT |
973 | ppp_start_xmit(struct sk_buff *skb, struct net_device *dev) |
974 | { | |
c8019bf3 | 975 | struct ppp *ppp = netdev_priv(dev); |
1da177e4 LT |
976 | int npi, proto; |
977 | unsigned char *pp; | |
978 | ||
979 | npi = ethertype_to_npindex(ntohs(skb->protocol)); | |
980 | if (npi < 0) | |
981 | goto outf; | |
982 | ||
983 | /* Drop, accept or reject the packet */ | |
984 | switch (ppp->npmode[npi]) { | |
985 | case NPMODE_PASS: | |
986 | break; | |
987 | case NPMODE_QUEUE: | |
988 | /* it would be nice to have a way to tell the network | |
989 | system to queue this one up for later. */ | |
990 | goto outf; | |
991 | case NPMODE_DROP: | |
992 | case NPMODE_ERROR: | |
993 | goto outf; | |
994 | } | |
995 | ||
996 | /* Put the 2-byte PPP protocol number on the front, | |
997 | making sure there is room for the address and control fields. */ | |
7b797d5b HX |
998 | if (skb_cow_head(skb, PPP_HDRLEN)) |
999 | goto outf; | |
1000 | ||
1da177e4 LT |
1001 | pp = skb_push(skb, 2); |
1002 | proto = npindex_to_proto[npi]; | |
96545aeb | 1003 | put_unaligned_be16(proto, pp); |
1da177e4 | 1004 | |
1da177e4 | 1005 | skb_queue_tail(&ppp->file.xq, skb); |
9a5d2bd9 | 1006 | ppp_xmit_process(ppp); |
6ed10654 | 1007 | return NETDEV_TX_OK; |
1da177e4 LT |
1008 | |
1009 | outf: | |
1010 | kfree_skb(skb); | |
6ceffd47 | 1011 | ++dev->stats.tx_dropped; |
6ed10654 | 1012 | return NETDEV_TX_OK; |
1da177e4 LT |
1013 | } |
1014 | ||
1da177e4 LT |
1015 | static int |
1016 | ppp_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
1017 | { | |
c8019bf3 | 1018 | struct ppp *ppp = netdev_priv(dev); |
1da177e4 LT |
1019 | int err = -EFAULT; |
1020 | void __user *addr = (void __user *) ifr->ifr_ifru.ifru_data; | |
1021 | struct ppp_stats stats; | |
1022 | struct ppp_comp_stats cstats; | |
1023 | char *vers; | |
1024 | ||
1025 | switch (cmd) { | |
1026 | case SIOCGPPPSTATS: | |
1027 | ppp_get_stats(ppp, &stats); | |
1028 | if (copy_to_user(addr, &stats, sizeof(stats))) | |
1029 | break; | |
1030 | err = 0; | |
1031 | break; | |
1032 | ||
1033 | case SIOCGPPPCSTATS: | |
1034 | memset(&cstats, 0, sizeof(cstats)); | |
cd228d54 | 1035 | if (ppp->xc_state) |
1da177e4 | 1036 | ppp->xcomp->comp_stat(ppp->xc_state, &cstats.c); |
cd228d54 | 1037 | if (ppp->rc_state) |
1da177e4 LT |
1038 | ppp->rcomp->decomp_stat(ppp->rc_state, &cstats.d); |
1039 | if (copy_to_user(addr, &cstats, sizeof(cstats))) | |
1040 | break; | |
1041 | err = 0; | |
1042 | break; | |
1043 | ||
1044 | case SIOCGPPPVER: | |
1045 | vers = PPP_VERSION; | |
1046 | if (copy_to_user(addr, vers, strlen(vers) + 1)) | |
1047 | break; | |
1048 | err = 0; | |
1049 | break; | |
1050 | ||
1051 | default: | |
1052 | err = -EINVAL; | |
1053 | } | |
1054 | ||
1055 | return err; | |
1056 | } | |
1057 | ||
b77bc206 | 1058 | static struct rtnl_link_stats64* |
e51f6ff3 KG |
1059 | ppp_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats64) |
1060 | { | |
1061 | struct ppp *ppp = netdev_priv(dev); | |
1062 | ||
1063 | ppp_recv_lock(ppp); | |
1064 | stats64->rx_packets = ppp->stats64.rx_packets; | |
1065 | stats64->rx_bytes = ppp->stats64.rx_bytes; | |
1066 | ppp_recv_unlock(ppp); | |
1067 | ||
1068 | ppp_xmit_lock(ppp); | |
1069 | stats64->tx_packets = ppp->stats64.tx_packets; | |
1070 | stats64->tx_bytes = ppp->stats64.tx_bytes; | |
1071 | ppp_xmit_unlock(ppp); | |
1072 | ||
1073 | stats64->rx_errors = dev->stats.rx_errors; | |
1074 | stats64->tx_errors = dev->stats.tx_errors; | |
1075 | stats64->rx_dropped = dev->stats.rx_dropped; | |
1076 | stats64->tx_dropped = dev->stats.tx_dropped; | |
1077 | stats64->rx_length_errors = dev->stats.rx_length_errors; | |
1078 | ||
1079 | return stats64; | |
1080 | } | |
1081 | ||
303c07db ED |
1082 | static struct lock_class_key ppp_tx_busylock; |
1083 | static int ppp_dev_init(struct net_device *dev) | |
1084 | { | |
1085 | dev->qdisc_tx_busylock = &ppp_tx_busylock; | |
1086 | return 0; | |
1087 | } | |
1088 | ||
52256cfc | 1089 | static const struct net_device_ops ppp_netdev_ops = { |
303c07db | 1090 | .ndo_init = ppp_dev_init, |
e51f6ff3 KG |
1091 | .ndo_start_xmit = ppp_start_xmit, |
1092 | .ndo_do_ioctl = ppp_net_ioctl, | |
1093 | .ndo_get_stats64 = ppp_get_stats64, | |
52256cfc SH |
1094 | }; |
1095 | ||
1da177e4 LT |
1096 | static void ppp_setup(struct net_device *dev) |
1097 | { | |
52256cfc | 1098 | dev->netdev_ops = &ppp_netdev_ops; |
1da177e4 | 1099 | dev->hard_header_len = PPP_HDRLEN; |
bf7daebb | 1100 | dev->mtu = PPP_MRU; |
1da177e4 LT |
1101 | dev->addr_len = 0; |
1102 | dev->tx_queue_len = 3; | |
1103 | dev->type = ARPHRD_PPP; | |
1104 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
273ec51d | 1105 | dev->features |= NETIF_F_NETNS_LOCAL; |
02875878 | 1106 | netif_keep_dst(dev); |
1da177e4 LT |
1107 | } |
1108 | ||
1109 | /* | |
1110 | * Transmit-side routines. | |
1111 | */ | |
1112 | ||
1113 | /* | |
1114 | * Called to do any work queued up on the transmit side | |
1115 | * that can now be done. | |
1116 | */ | |
9a5d2bd9 | 1117 | static void |
1da177e4 LT |
1118 | ppp_xmit_process(struct ppp *ppp) |
1119 | { | |
1120 | struct sk_buff *skb; | |
1121 | ||
1122 | ppp_xmit_lock(ppp); | |
739840d5 | 1123 | if (!ppp->closing) { |
1da177e4 | 1124 | ppp_push(ppp); |
8e95a202 JP |
1125 | while (!ppp->xmit_pending && |
1126 | (skb = skb_dequeue(&ppp->file.xq))) | |
1da177e4 LT |
1127 | ppp_send_frame(ppp, skb); |
1128 | /* If there's no work left to do, tell the core net | |
1129 | code that we can accept some more. */ | |
9a5d2bd9 | 1130 | if (!ppp->xmit_pending && !skb_peek(&ppp->file.xq)) |
1da177e4 | 1131 | netif_wake_queue(ppp->dev); |
9a5d2bd9 DW |
1132 | else |
1133 | netif_stop_queue(ppp->dev); | |
1da177e4 LT |
1134 | } |
1135 | ppp_xmit_unlock(ppp); | |
1136 | } | |
1137 | ||
b3f9b92a MD |
1138 | static inline struct sk_buff * |
1139 | pad_compress_skb(struct ppp *ppp, struct sk_buff *skb) | |
1140 | { | |
1141 | struct sk_buff *new_skb; | |
1142 | int len; | |
1143 | int new_skb_size = ppp->dev->mtu + | |
1144 | ppp->xcomp->comp_extra + ppp->dev->hard_header_len; | |
1145 | int compressor_skb_size = ppp->dev->mtu + | |
1146 | ppp->xcomp->comp_extra + PPP_HDRLEN; | |
1147 | new_skb = alloc_skb(new_skb_size, GFP_ATOMIC); | |
1148 | if (!new_skb) { | |
1149 | if (net_ratelimit()) | |
b48f8c23 | 1150 | netdev_err(ppp->dev, "PPP: no memory (comp pkt)\n"); |
b3f9b92a MD |
1151 | return NULL; |
1152 | } | |
1153 | if (ppp->dev->hard_header_len > PPP_HDRLEN) | |
1154 | skb_reserve(new_skb, | |
1155 | ppp->dev->hard_header_len - PPP_HDRLEN); | |
1156 | ||
1157 | /* compressor still expects A/C bytes in hdr */ | |
1158 | len = ppp->xcomp->compress(ppp->xc_state, skb->data - 2, | |
1159 | new_skb->data, skb->len + 2, | |
1160 | compressor_skb_size); | |
1161 | if (len > 0 && (ppp->flags & SC_CCP_UP)) { | |
968d7018 | 1162 | consume_skb(skb); |
b3f9b92a MD |
1163 | skb = new_skb; |
1164 | skb_put(skb, len); | |
1165 | skb_pull(skb, 2); /* pull off A/C bytes */ | |
1166 | } else if (len == 0) { | |
1167 | /* didn't compress, or CCP not up yet */ | |
968d7018 | 1168 | consume_skb(new_skb); |
b3f9b92a MD |
1169 | new_skb = skb; |
1170 | } else { | |
1171 | /* | |
1172 | * (len < 0) | |
1173 | * MPPE requires that we do not send unencrypted | |
1174 | * frames. The compressor will return -1 if we | |
1175 | * should drop the frame. We cannot simply test | |
1176 | * the compress_proto because MPPE and MPPC share | |
1177 | * the same number. | |
1178 | */ | |
1179 | if (net_ratelimit()) | |
b48f8c23 | 1180 | netdev_err(ppp->dev, "ppp: compressor dropped pkt\n"); |
b3f9b92a | 1181 | kfree_skb(skb); |
968d7018 | 1182 | consume_skb(new_skb); |
b3f9b92a MD |
1183 | new_skb = NULL; |
1184 | } | |
1185 | return new_skb; | |
1186 | } | |
1187 | ||
1da177e4 LT |
1188 | /* |
1189 | * Compress and send a frame. | |
1190 | * The caller should have locked the xmit path, | |
1191 | * and xmit_pending should be 0. | |
1192 | */ | |
1193 | static void | |
1194 | ppp_send_frame(struct ppp *ppp, struct sk_buff *skb) | |
1195 | { | |
1196 | int proto = PPP_PROTO(skb); | |
1197 | struct sk_buff *new_skb; | |
1198 | int len; | |
1199 | unsigned char *cp; | |
1200 | ||
1201 | if (proto < 0x8000) { | |
1202 | #ifdef CONFIG_PPP_FILTER | |
1203 | /* check if we should pass this packet */ | |
1204 | /* the filter instructions are constructed assuming | |
1205 | a four-byte PPP header on each packet */ | |
1206 | *skb_push(skb, 2) = 1; | |
8e95a202 | 1207 | if (ppp->pass_filter && |
7ae457c1 | 1208 | BPF_PROG_RUN(ppp->pass_filter, skb) == 0) { |
1da177e4 | 1209 | if (ppp->debug & 1) |
b48f8c23 DM |
1210 | netdev_printk(KERN_DEBUG, ppp->dev, |
1211 | "PPP: outbound frame " | |
1212 | "not passed\n"); | |
1da177e4 LT |
1213 | kfree_skb(skb); |
1214 | return; | |
1215 | } | |
1216 | /* if this packet passes the active filter, record the time */ | |
8e95a202 | 1217 | if (!(ppp->active_filter && |
7ae457c1 | 1218 | BPF_PROG_RUN(ppp->active_filter, skb) == 0)) |
1da177e4 LT |
1219 | ppp->last_xmit = jiffies; |
1220 | skb_pull(skb, 2); | |
1221 | #else | |
1222 | /* for data packets, record the time */ | |
1223 | ppp->last_xmit = jiffies; | |
1224 | #endif /* CONFIG_PPP_FILTER */ | |
1225 | } | |
1226 | ||
e51f6ff3 KG |
1227 | ++ppp->stats64.tx_packets; |
1228 | ppp->stats64.tx_bytes += skb->len - 2; | |
1da177e4 LT |
1229 | |
1230 | switch (proto) { | |
1231 | case PPP_IP: | |
cd228d54 | 1232 | if (!ppp->vj || (ppp->flags & SC_COMP_TCP) == 0) |
1da177e4 LT |
1233 | break; |
1234 | /* try to do VJ TCP header compression */ | |
1235 | new_skb = alloc_skb(skb->len + ppp->dev->hard_header_len - 2, | |
1236 | GFP_ATOMIC); | |
cd228d54 | 1237 | if (!new_skb) { |
b48f8c23 | 1238 | netdev_err(ppp->dev, "PPP: no memory (VJ comp pkt)\n"); |
1da177e4 LT |
1239 | goto drop; |
1240 | } | |
1241 | skb_reserve(new_skb, ppp->dev->hard_header_len - 2); | |
1242 | cp = skb->data + 2; | |
1243 | len = slhc_compress(ppp->vj, cp, skb->len - 2, | |
1244 | new_skb->data + 2, &cp, | |
1245 | !(ppp->flags & SC_NO_TCP_CCID)); | |
1246 | if (cp == skb->data + 2) { | |
1247 | /* didn't compress */ | |
968d7018 | 1248 | consume_skb(new_skb); |
1da177e4 LT |
1249 | } else { |
1250 | if (cp[0] & SL_TYPE_COMPRESSED_TCP) { | |
1251 | proto = PPP_VJC_COMP; | |
1252 | cp[0] &= ~SL_TYPE_COMPRESSED_TCP; | |
1253 | } else { | |
1254 | proto = PPP_VJC_UNCOMP; | |
1255 | cp[0] = skb->data[2]; | |
1256 | } | |
968d7018 | 1257 | consume_skb(skb); |
1da177e4 LT |
1258 | skb = new_skb; |
1259 | cp = skb_put(skb, len + 2); | |
1260 | cp[0] = 0; | |
1261 | cp[1] = proto; | |
1262 | } | |
1263 | break; | |
1264 | ||
1265 | case PPP_CCP: | |
1266 | /* peek at outbound CCP frames */ | |
1267 | ppp_ccp_peek(ppp, skb, 0); | |
1268 | break; | |
1269 | } | |
1270 | ||
1271 | /* try to do packet compression */ | |
8e95a202 JP |
1272 | if ((ppp->xstate & SC_COMP_RUN) && ppp->xc_state && |
1273 | proto != PPP_LCP && proto != PPP_CCP) { | |
b3f9b92a MD |
1274 | if (!(ppp->flags & SC_CCP_UP) && (ppp->flags & SC_MUST_COMP)) { |
1275 | if (net_ratelimit()) | |
b48f8c23 DM |
1276 | netdev_err(ppp->dev, |
1277 | "ppp: compression required but " | |
1278 | "down - pkt dropped.\n"); | |
1da177e4 LT |
1279 | goto drop; |
1280 | } | |
b3f9b92a MD |
1281 | skb = pad_compress_skb(ppp, skb); |
1282 | if (!skb) | |
1283 | goto drop; | |
1da177e4 LT |
1284 | } |
1285 | ||
1286 | /* | |
1287 | * If we are waiting for traffic (demand dialling), | |
1288 | * queue it up for pppd to receive. | |
1289 | */ | |
1290 | if (ppp->flags & SC_LOOP_TRAFFIC) { | |
1291 | if (ppp->file.rq.qlen > PPP_MAX_RQLEN) | |
1292 | goto drop; | |
1293 | skb_queue_tail(&ppp->file.rq, skb); | |
1294 | wake_up_interruptible(&ppp->file.rwait); | |
1295 | return; | |
1296 | } | |
1297 | ||
1298 | ppp->xmit_pending = skb; | |
1299 | ppp_push(ppp); | |
1300 | return; | |
1301 | ||
1302 | drop: | |
1d2f8c95 | 1303 | kfree_skb(skb); |
8c0469cd | 1304 | ++ppp->dev->stats.tx_errors; |
1da177e4 LT |
1305 | } |
1306 | ||
1307 | /* | |
1308 | * Try to send the frame in xmit_pending. | |
1309 | * The caller should have the xmit path locked. | |
1310 | */ | |
1311 | static void | |
1312 | ppp_push(struct ppp *ppp) | |
1313 | { | |
1314 | struct list_head *list; | |
1315 | struct channel *pch; | |
1316 | struct sk_buff *skb = ppp->xmit_pending; | |
1317 | ||
cd228d54 | 1318 | if (!skb) |
1da177e4 LT |
1319 | return; |
1320 | ||
1321 | list = &ppp->channels; | |
1322 | if (list_empty(list)) { | |
1323 | /* nowhere to send the packet, just drop it */ | |
1324 | ppp->xmit_pending = NULL; | |
1325 | kfree_skb(skb); | |
1326 | return; | |
1327 | } | |
1328 | ||
1329 | if ((ppp->flags & SC_MULTILINK) == 0) { | |
1330 | /* not doing multilink: send it down the first channel */ | |
1331 | list = list->next; | |
1332 | pch = list_entry(list, struct channel, clist); | |
1333 | ||
1334 | spin_lock_bh(&pch->downl); | |
1335 | if (pch->chan) { | |
1336 | if (pch->chan->ops->start_xmit(pch->chan, skb)) | |
1337 | ppp->xmit_pending = NULL; | |
1338 | } else { | |
1339 | /* channel got unregistered */ | |
1340 | kfree_skb(skb); | |
1341 | ppp->xmit_pending = NULL; | |
1342 | } | |
1343 | spin_unlock_bh(&pch->downl); | |
1344 | return; | |
1345 | } | |
1346 | ||
1347 | #ifdef CONFIG_PPP_MULTILINK | |
1348 | /* Multilink: fragment the packet over as many links | |
1349 | as can take the packet at the moment. */ | |
1350 | if (!ppp_mp_explode(ppp, skb)) | |
1351 | return; | |
1352 | #endif /* CONFIG_PPP_MULTILINK */ | |
1353 | ||
1354 | ppp->xmit_pending = NULL; | |
1355 | kfree_skb(skb); | |
1356 | } | |
1357 | ||
1358 | #ifdef CONFIG_PPP_MULTILINK | |
d39cd5e9 | 1359 | static bool mp_protocol_compress __read_mostly = true; |
1360 | module_param(mp_protocol_compress, bool, S_IRUGO | S_IWUSR); | |
1361 | MODULE_PARM_DESC(mp_protocol_compress, | |
1362 | "compress protocol id in multilink fragments"); | |
1363 | ||
1da177e4 LT |
1364 | /* |
1365 | * Divide a packet to be transmitted into fragments and | |
1366 | * send them out the individual links. | |
1367 | */ | |
1368 | static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb) | |
1369 | { | |
fa44a73c LS |
1370 | int len, totlen; |
1371 | int i, bits, hdrlen, mtu; | |
1372 | int flen; | |
1373 | int navail, nfree, nzero; | |
1374 | int nbigger; | |
1375 | int totspeed; | |
1376 | int totfree; | |
1da177e4 LT |
1377 | unsigned char *p, *q; |
1378 | struct list_head *list; | |
1379 | struct channel *pch; | |
1380 | struct sk_buff *frag; | |
1381 | struct ppp_channel *chan; | |
1382 | ||
9c705260 | 1383 | totspeed = 0; /*total bitrate of the bundle*/ |
fa44a73c LS |
1384 | nfree = 0; /* # channels which have no packet already queued */ |
1385 | navail = 0; /* total # of usable channels (not deregistered) */ | |
1386 | nzero = 0; /* number of channels with zero speed associated*/ | |
1387 | totfree = 0; /*total # of channels available and | |
9c705260 GP |
1388 | *having no queued packets before |
1389 | *starting the fragmentation*/ | |
1390 | ||
1da177e4 | 1391 | hdrlen = (ppp->flags & SC_MP_XSHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN; |
fa44a73c LS |
1392 | i = 0; |
1393 | list_for_each_entry(pch, &ppp->channels, clist) { | |
3429769b DC |
1394 | if (pch->chan) { |
1395 | pch->avail = 1; | |
1396 | navail++; | |
1397 | pch->speed = pch->chan->speed; | |
1398 | } else { | |
1399 | pch->avail = 0; | |
1400 | } | |
fa44a73c | 1401 | if (pch->avail) { |
b03efcfb | 1402 | if (skb_queue_empty(&pch->file.xq) || |
fa44a73c | 1403 | !pch->had_frag) { |
9c705260 GP |
1404 | if (pch->speed == 0) |
1405 | nzero++; | |
1406 | else | |
1407 | totspeed += pch->speed; | |
1408 | ||
1409 | pch->avail = 2; | |
1410 | ++nfree; | |
1411 | ++totfree; | |
1412 | } | |
fa44a73c LS |
1413 | if (!pch->had_frag && i < ppp->nxchan) |
1414 | ppp->nxchan = i; | |
1da177e4 | 1415 | } |
516cd15f | 1416 | ++i; |
1da177e4 | 1417 | } |
516cd15f | 1418 | /* |
fa44a73c LS |
1419 | * Don't start sending this packet unless at least half of |
1420 | * the channels are free. This gives much better TCP | |
1421 | * performance if we have a lot of channels. | |
516cd15f | 1422 | */ |
fa44a73c LS |
1423 | if (nfree == 0 || nfree < navail / 2) |
1424 | return 0; /* can't take now, leave it in xmit_pending */ | |
1da177e4 | 1425 | |
d39cd5e9 | 1426 | /* Do protocol field compression */ |
fa44a73c LS |
1427 | p = skb->data; |
1428 | len = skb->len; | |
d39cd5e9 | 1429 | if (*p == 0 && mp_protocol_compress) { |
1da177e4 LT |
1430 | ++p; |
1431 | --len; | |
1432 | } | |
1433 | ||
9c705260 | 1434 | totlen = len; |
fa44a73c | 1435 | nbigger = len % nfree; |
9c705260 | 1436 | |
fa44a73c LS |
1437 | /* skip to the channel after the one we last used |
1438 | and start at that one */ | |
81616c5a | 1439 | list = &ppp->channels; |
fa44a73c | 1440 | for (i = 0; i < ppp->nxchan; ++i) { |
1da177e4 | 1441 | list = list->next; |
fa44a73c LS |
1442 | if (list == &ppp->channels) { |
1443 | i = 0; | |
1da177e4 LT |
1444 | break; |
1445 | } | |
1446 | } | |
1447 | ||
fa44a73c | 1448 | /* create a fragment for each channel */ |
1da177e4 | 1449 | bits = B; |
fa44a73c | 1450 | while (len > 0) { |
1da177e4 | 1451 | list = list->next; |
fa44a73c LS |
1452 | if (list == &ppp->channels) { |
1453 | i = 0; | |
1da177e4 LT |
1454 | continue; |
1455 | } | |
fa44a73c | 1456 | pch = list_entry(list, struct channel, clist); |
1da177e4 LT |
1457 | ++i; |
1458 | if (!pch->avail) | |
1459 | continue; | |
1460 | ||
516cd15f | 1461 | /* |
fa44a73c LS |
1462 | * Skip this channel if it has a fragment pending already and |
1463 | * we haven't given a fragment to all of the free channels. | |
516cd15f PM |
1464 | */ |
1465 | if (pch->avail == 1) { | |
fa44a73c | 1466 | if (nfree > 0) |
516cd15f PM |
1467 | continue; |
1468 | } else { | |
516cd15f PM |
1469 | pch->avail = 1; |
1470 | } | |
1471 | ||
1da177e4 LT |
1472 | /* check the channel's mtu and whether it is still attached. */ |
1473 | spin_lock_bh(&pch->downl); | |
516cd15f | 1474 | if (pch->chan == NULL) { |
fa44a73c | 1475 | /* can't use this channel, it's being deregistered */ |
9c705260 GP |
1476 | if (pch->speed == 0) |
1477 | nzero--; | |
1478 | else | |
fa44a73c | 1479 | totspeed -= pch->speed; |
9c705260 | 1480 | |
1da177e4 LT |
1481 | spin_unlock_bh(&pch->downl); |
1482 | pch->avail = 0; | |
9c705260 GP |
1483 | totlen = len; |
1484 | totfree--; | |
1485 | nfree--; | |
fa44a73c | 1486 | if (--navail == 0) |
1da177e4 LT |
1487 | break; |
1488 | continue; | |
1489 | } | |
1490 | ||
1491 | /* | |
9c705260 | 1492 | *if the channel speed is not set divide |
fa44a73c | 1493 | *the packet evenly among the free channels; |
9c705260 GP |
1494 | *otherwise divide it according to the speed |
1495 | *of the channel we are going to transmit on | |
1496 | */ | |
886f9fe6 | 1497 | flen = len; |
a53a8b56 BM |
1498 | if (nfree > 0) { |
1499 | if (pch->speed == 0) { | |
536e00e5 | 1500 | flen = len/nfree; |
a53a8b56 BM |
1501 | if (nbigger > 0) { |
1502 | flen++; | |
1503 | nbigger--; | |
1504 | } | |
1505 | } else { | |
1506 | flen = (((totfree - nzero)*(totlen + hdrlen*totfree)) / | |
1507 | ((totspeed*totfree)/pch->speed)) - hdrlen; | |
1508 | if (nbigger > 0) { | |
1509 | flen += ((totfree - nzero)*pch->speed)/totspeed; | |
1510 | nbigger -= ((totfree - nzero)*pch->speed)/ | |
9c705260 | 1511 | totspeed; |
a53a8b56 | 1512 | } |
9c705260 | 1513 | } |
a53a8b56 | 1514 | nfree--; |
9c705260 | 1515 | } |
9c705260 GP |
1516 | |
1517 | /* | |
fa44a73c | 1518 | *check if we are on the last channel or |
25985edc | 1519 | *we exceded the length of the data to |
9c705260 GP |
1520 | *fragment |
1521 | */ | |
a53a8b56 | 1522 | if ((nfree <= 0) || (flen > len)) |
9c705260 GP |
1523 | flen = len; |
1524 | /* | |
1525 | *it is not worth to tx on slow channels: | |
1526 | *in that case from the resulting flen according to the | |
1527 | *above formula will be equal or less than zero. | |
1528 | *Skip the channel in this case | |
1da177e4 | 1529 | */ |
fa44a73c | 1530 | if (flen <= 0) { |
9c705260 GP |
1531 | pch->avail = 2; |
1532 | spin_unlock_bh(&pch->downl); | |
1533 | continue; | |
1534 | } | |
1535 | ||
22e83a29 HW |
1536 | /* |
1537 | * hdrlen includes the 2-byte PPP protocol field, but the | |
1538 | * MTU counts only the payload excluding the protocol field. | |
1539 | * (RFC1661 Section 2) | |
1540 | */ | |
1541 | mtu = pch->chan->mtu - (hdrlen - 2); | |
fa44a73c LS |
1542 | if (mtu < 4) |
1543 | mtu = 4; | |
516cd15f PM |
1544 | if (flen > mtu) |
1545 | flen = mtu; | |
fa44a73c LS |
1546 | if (flen == len) |
1547 | bits |= E; | |
1548 | frag = alloc_skb(flen + hdrlen + (flen == 0), GFP_ATOMIC); | |
cd228d54 | 1549 | if (!frag) |
516cd15f | 1550 | goto noskb; |
fa44a73c | 1551 | q = skb_put(frag, flen + hdrlen); |
516cd15f | 1552 | |
fa44a73c | 1553 | /* make the MP header */ |
96545aeb | 1554 | put_unaligned_be16(PPP_MP, q); |
516cd15f | 1555 | if (ppp->flags & SC_MP_XSHORTSEQ) { |
fa44a73c | 1556 | q[2] = bits + ((ppp->nxseq >> 8) & 0xf); |
516cd15f PM |
1557 | q[3] = ppp->nxseq; |
1558 | } else { | |
1559 | q[2] = bits; | |
1560 | q[3] = ppp->nxseq >> 16; | |
1561 | q[4] = ppp->nxseq >> 8; | |
1562 | q[5] = ppp->nxseq; | |
1da177e4 | 1563 | } |
516cd15f | 1564 | |
9c705260 | 1565 | memcpy(q + hdrlen, p, flen); |
516cd15f PM |
1566 | |
1567 | /* try to send it down the channel */ | |
1568 | chan = pch->chan; | |
fa44a73c | 1569 | if (!skb_queue_empty(&pch->file.xq) || |
9c705260 | 1570 | !chan->ops->start_xmit(chan, frag)) |
516cd15f | 1571 | skb_queue_tail(&pch->file.xq, frag); |
fa44a73c | 1572 | pch->had_frag = 1; |
516cd15f | 1573 | p += flen; |
fa44a73c | 1574 | len -= flen; |
516cd15f PM |
1575 | ++ppp->nxseq; |
1576 | bits = 0; | |
1da177e4 | 1577 | spin_unlock_bh(&pch->downl); |
516cd15f | 1578 | } |
fa44a73c | 1579 | ppp->nxchan = i; |
1da177e4 LT |
1580 | |
1581 | return 1; | |
1582 | ||
1583 | noskb: | |
1584 | spin_unlock_bh(&pch->downl); | |
1585 | if (ppp->debug & 1) | |
b48f8c23 | 1586 | netdev_err(ppp->dev, "PPP: no memory (fragment)\n"); |
8c0469cd | 1587 | ++ppp->dev->stats.tx_errors; |
1da177e4 LT |
1588 | ++ppp->nxseq; |
1589 | return 1; /* abandon the frame */ | |
1590 | } | |
1591 | #endif /* CONFIG_PPP_MULTILINK */ | |
1592 | ||
1593 | /* | |
1594 | * Try to send data out on a channel. | |
1595 | */ | |
1596 | static void | |
1597 | ppp_channel_push(struct channel *pch) | |
1598 | { | |
1599 | struct sk_buff *skb; | |
1600 | struct ppp *ppp; | |
1601 | ||
1602 | spin_lock_bh(&pch->downl); | |
cd228d54 | 1603 | if (pch->chan) { |
b03efcfb | 1604 | while (!skb_queue_empty(&pch->file.xq)) { |
1da177e4 LT |
1605 | skb = skb_dequeue(&pch->file.xq); |
1606 | if (!pch->chan->ops->start_xmit(pch->chan, skb)) { | |
1607 | /* put the packet back and try again later */ | |
1608 | skb_queue_head(&pch->file.xq, skb); | |
1609 | break; | |
1610 | } | |
1611 | } | |
1612 | } else { | |
1613 | /* channel got deregistered */ | |
1614 | skb_queue_purge(&pch->file.xq); | |
1615 | } | |
1616 | spin_unlock_bh(&pch->downl); | |
1617 | /* see if there is anything from the attached unit to be sent */ | |
b03efcfb | 1618 | if (skb_queue_empty(&pch->file.xq)) { |
1da177e4 LT |
1619 | read_lock_bh(&pch->upl); |
1620 | ppp = pch->ppp; | |
cd228d54 | 1621 | if (ppp) |
1da177e4 LT |
1622 | ppp_xmit_process(ppp); |
1623 | read_unlock_bh(&pch->upl); | |
1624 | } | |
1625 | } | |
1626 | ||
1627 | /* | |
1628 | * Receive-side routines. | |
1629 | */ | |
1630 | ||
a00eac0c DM |
1631 | struct ppp_mp_skb_parm { |
1632 | u32 sequence; | |
1633 | u8 BEbits; | |
1634 | }; | |
1635 | #define PPP_MP_CB(skb) ((struct ppp_mp_skb_parm *)((skb)->cb)) | |
1da177e4 LT |
1636 | |
1637 | static inline void | |
1638 | ppp_do_recv(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) | |
1639 | { | |
1640 | ppp_recv_lock(ppp); | |
739840d5 | 1641 | if (!ppp->closing) |
1da177e4 LT |
1642 | ppp_receive_frame(ppp, skb, pch); |
1643 | else | |
1644 | kfree_skb(skb); | |
1645 | ppp_recv_unlock(ppp); | |
1646 | } | |
1647 | ||
1648 | void | |
1649 | ppp_input(struct ppp_channel *chan, struct sk_buff *skb) | |
1650 | { | |
1651 | struct channel *pch = chan->ppp; | |
1652 | int proto; | |
1653 | ||
ea8420e9 | 1654 | if (!pch) { |
1da177e4 LT |
1655 | kfree_skb(skb); |
1656 | return; | |
1657 | } | |
516cd15f | 1658 | |
1da177e4 | 1659 | read_lock_bh(&pch->upl); |
ea8420e9 SA |
1660 | if (!pskb_may_pull(skb, 2)) { |
1661 | kfree_skb(skb); | |
1662 | if (pch->ppp) { | |
1663 | ++pch->ppp->dev->stats.rx_length_errors; | |
1664 | ppp_receive_error(pch->ppp); | |
1665 | } | |
1666 | goto done; | |
1667 | } | |
1668 | ||
1669 | proto = PPP_PROTO(skb); | |
cd228d54 | 1670 | if (!pch->ppp || proto >= 0xc000 || proto == PPP_CCPFRAG) { |
1da177e4 LT |
1671 | /* put it on the channel queue */ |
1672 | skb_queue_tail(&pch->file.rq, skb); | |
1673 | /* drop old frames if queue too long */ | |
8e95a202 JP |
1674 | while (pch->file.rq.qlen > PPP_MAX_RQLEN && |
1675 | (skb = skb_dequeue(&pch->file.rq))) | |
1da177e4 LT |
1676 | kfree_skb(skb); |
1677 | wake_up_interruptible(&pch->file.rwait); | |
1678 | } else { | |
1679 | ppp_do_recv(pch->ppp, skb, pch); | |
1680 | } | |
ea8420e9 SA |
1681 | |
1682 | done: | |
1da177e4 LT |
1683 | read_unlock_bh(&pch->upl); |
1684 | } | |
1685 | ||
1686 | /* Put a 0-length skb in the receive queue as an error indication */ | |
1687 | void | |
1688 | ppp_input_error(struct ppp_channel *chan, int code) | |
1689 | { | |
1690 | struct channel *pch = chan->ppp; | |
1691 | struct sk_buff *skb; | |
1692 | ||
cd228d54 | 1693 | if (!pch) |
1da177e4 LT |
1694 | return; |
1695 | ||
1696 | read_lock_bh(&pch->upl); | |
cd228d54 | 1697 | if (pch->ppp) { |
1da177e4 | 1698 | skb = alloc_skb(0, GFP_ATOMIC); |
cd228d54 | 1699 | if (skb) { |
1da177e4 LT |
1700 | skb->len = 0; /* probably unnecessary */ |
1701 | skb->cb[0] = code; | |
1702 | ppp_do_recv(pch->ppp, skb, pch); | |
1703 | } | |
1704 | } | |
1705 | read_unlock_bh(&pch->upl); | |
1706 | } | |
1707 | ||
1708 | /* | |
1709 | * We come in here to process a received frame. | |
1710 | * The receive side of the ppp unit is locked. | |
1711 | */ | |
1712 | static void | |
1713 | ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) | |
1714 | { | |
ea8420e9 SA |
1715 | /* note: a 0-length skb is used as an error indication */ |
1716 | if (skb->len > 0) { | |
1da177e4 LT |
1717 | #ifdef CONFIG_PPP_MULTILINK |
1718 | /* XXX do channel-level decompression here */ | |
1719 | if (PPP_PROTO(skb) == PPP_MP) | |
1720 | ppp_receive_mp_frame(ppp, skb, pch); | |
1721 | else | |
1722 | #endif /* CONFIG_PPP_MULTILINK */ | |
1723 | ppp_receive_nonmp_frame(ppp, skb); | |
ea8420e9 SA |
1724 | } else { |
1725 | kfree_skb(skb); | |
1726 | ppp_receive_error(ppp); | |
1da177e4 | 1727 | } |
1da177e4 LT |
1728 | } |
1729 | ||
1730 | static void | |
1731 | ppp_receive_error(struct ppp *ppp) | |
1732 | { | |
8c0469cd | 1733 | ++ppp->dev->stats.rx_errors; |
cd228d54 | 1734 | if (ppp->vj) |
1da177e4 LT |
1735 | slhc_toss(ppp->vj); |
1736 | } | |
1737 | ||
1738 | static void | |
1739 | ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb) | |
1740 | { | |
1741 | struct sk_buff *ns; | |
1742 | int proto, len, npi; | |
1743 | ||
1744 | /* | |
1745 | * Decompress the frame, if compressed. | |
1746 | * Note that some decompressors need to see uncompressed frames | |
1747 | * that come in as well as compressed frames. | |
1748 | */ | |
8e95a202 JP |
1749 | if (ppp->rc_state && (ppp->rstate & SC_DECOMP_RUN) && |
1750 | (ppp->rstate & (SC_DC_FERROR | SC_DC_ERROR)) == 0) | |
1da177e4 LT |
1751 | skb = ppp_decompress_frame(ppp, skb); |
1752 | ||
b3f9b92a MD |
1753 | if (ppp->flags & SC_MUST_COMP && ppp->rstate & SC_DC_FERROR) |
1754 | goto err; | |
1755 | ||
1da177e4 LT |
1756 | proto = PPP_PROTO(skb); |
1757 | switch (proto) { | |
1758 | case PPP_VJC_COMP: | |
1759 | /* decompress VJ compressed packets */ | |
cd228d54 | 1760 | if (!ppp->vj || (ppp->flags & SC_REJ_COMP_TCP)) |
1da177e4 LT |
1761 | goto err; |
1762 | ||
2a38b775 | 1763 | if (skb_tailroom(skb) < 124 || skb_cloned(skb)) { |
1da177e4 LT |
1764 | /* copy to a new sk_buff with more tailroom */ |
1765 | ns = dev_alloc_skb(skb->len + 128); | |
cd228d54 | 1766 | if (!ns) { |
b48f8c23 DM |
1767 | netdev_err(ppp->dev, "PPP: no memory " |
1768 | "(VJ decomp)\n"); | |
1da177e4 LT |
1769 | goto err; |
1770 | } | |
1771 | skb_reserve(ns, 2); | |
1772 | skb_copy_bits(skb, 0, skb_put(ns, skb->len), skb->len); | |
968d7018 | 1773 | consume_skb(skb); |
1da177e4 LT |
1774 | skb = ns; |
1775 | } | |
e3f749c4 HX |
1776 | else |
1777 | skb->ip_summed = CHECKSUM_NONE; | |
1da177e4 LT |
1778 | |
1779 | len = slhc_uncompress(ppp->vj, skb->data + 2, skb->len - 2); | |
1780 | if (len <= 0) { | |
b48f8c23 DM |
1781 | netdev_printk(KERN_DEBUG, ppp->dev, |
1782 | "PPP: VJ decompression error\n"); | |
1da177e4 LT |
1783 | goto err; |
1784 | } | |
1785 | len += 2; | |
1786 | if (len > skb->len) | |
1787 | skb_put(skb, len - skb->len); | |
1788 | else if (len < skb->len) | |
1789 | skb_trim(skb, len); | |
1790 | proto = PPP_IP; | |
1791 | break; | |
1792 | ||
1793 | case PPP_VJC_UNCOMP: | |
cd228d54 | 1794 | if (!ppp->vj || (ppp->flags & SC_REJ_COMP_TCP)) |
1da177e4 | 1795 | goto err; |
6aa20a22 | 1796 | |
1da177e4 LT |
1797 | /* Until we fix the decompressor need to make sure |
1798 | * data portion is linear. | |
1799 | */ | |
6aa20a22 | 1800 | if (!pskb_may_pull(skb, skb->len)) |
1da177e4 LT |
1801 | goto err; |
1802 | ||
1803 | if (slhc_remember(ppp->vj, skb->data + 2, skb->len - 2) <= 0) { | |
b48f8c23 | 1804 | netdev_err(ppp->dev, "PPP: VJ uncompressed error\n"); |
1da177e4 LT |
1805 | goto err; |
1806 | } | |
1807 | proto = PPP_IP; | |
1808 | break; | |
1809 | ||
1810 | case PPP_CCP: | |
1811 | ppp_ccp_peek(ppp, skb, 1); | |
1812 | break; | |
1813 | } | |
1814 | ||
e51f6ff3 KG |
1815 | ++ppp->stats64.rx_packets; |
1816 | ppp->stats64.rx_bytes += skb->len - 2; | |
1da177e4 LT |
1817 | |
1818 | npi = proto_to_npindex(proto); | |
1819 | if (npi < 0) { | |
1820 | /* control or unknown frame - pass it to pppd */ | |
1821 | skb_queue_tail(&ppp->file.rq, skb); | |
1822 | /* limit queue length by dropping old frames */ | |
8e95a202 JP |
1823 | while (ppp->file.rq.qlen > PPP_MAX_RQLEN && |
1824 | (skb = skb_dequeue(&ppp->file.rq))) | |
1da177e4 LT |
1825 | kfree_skb(skb); |
1826 | /* wake up any process polling or blocking on read */ | |
1827 | wake_up_interruptible(&ppp->file.rwait); | |
1828 | ||
1829 | } else { | |
1830 | /* network protocol frame - give it to the kernel */ | |
1831 | ||
1832 | #ifdef CONFIG_PPP_FILTER | |
1833 | /* check if the packet passes the pass and active filters */ | |
1834 | /* the filter instructions are constructed assuming | |
1835 | a four-byte PPP header on each packet */ | |
2a38b775 | 1836 | if (ppp->pass_filter || ppp->active_filter) { |
14bbd6a5 | 1837 | if (skb_unclone(skb, GFP_ATOMIC)) |
2a38b775 HX |
1838 | goto err; |
1839 | ||
1840 | *skb_push(skb, 2) = 0; | |
8e95a202 | 1841 | if (ppp->pass_filter && |
7ae457c1 | 1842 | BPF_PROG_RUN(ppp->pass_filter, skb) == 0) { |
2a38b775 | 1843 | if (ppp->debug & 1) |
b48f8c23 DM |
1844 | netdev_printk(KERN_DEBUG, ppp->dev, |
1845 | "PPP: inbound frame " | |
1846 | "not passed\n"); | |
2a38b775 HX |
1847 | kfree_skb(skb); |
1848 | return; | |
1849 | } | |
8e95a202 | 1850 | if (!(ppp->active_filter && |
7ae457c1 | 1851 | BPF_PROG_RUN(ppp->active_filter, skb) == 0)) |
2a38b775 HX |
1852 | ppp->last_recv = jiffies; |
1853 | __skb_pull(skb, 2); | |
1854 | } else | |
1da177e4 | 1855 | #endif /* CONFIG_PPP_FILTER */ |
2a38b775 | 1856 | ppp->last_recv = jiffies; |
1da177e4 | 1857 | |
8e95a202 JP |
1858 | if ((ppp->dev->flags & IFF_UP) == 0 || |
1859 | ppp->npmode[npi] != NPMODE_PASS) { | |
1da177e4 LT |
1860 | kfree_skb(skb); |
1861 | } else { | |
cbb042f9 HX |
1862 | /* chop off protocol */ |
1863 | skb_pull_rcsum(skb, 2); | |
1da177e4 LT |
1864 | skb->dev = ppp->dev; |
1865 | skb->protocol = htons(npindex_to_ethertype[npi]); | |
459a98ed | 1866 | skb_reset_mac_header(skb); |
1da177e4 | 1867 | netif_rx(skb); |
1da177e4 LT |
1868 | } |
1869 | } | |
1870 | return; | |
1871 | ||
1872 | err: | |
1873 | kfree_skb(skb); | |
1874 | ppp_receive_error(ppp); | |
1875 | } | |
1876 | ||
1877 | static struct sk_buff * | |
1878 | ppp_decompress_frame(struct ppp *ppp, struct sk_buff *skb) | |
1879 | { | |
1880 | int proto = PPP_PROTO(skb); | |
1881 | struct sk_buff *ns; | |
1882 | int len; | |
1883 | ||
1884 | /* Until we fix all the decompressor's need to make sure | |
1885 | * data portion is linear. | |
1886 | */ | |
1887 | if (!pskb_may_pull(skb, skb->len)) | |
1888 | goto err; | |
1889 | ||
1890 | if (proto == PPP_COMP) { | |
4b2a8fb3 KS |
1891 | int obuff_size; |
1892 | ||
1893 | switch(ppp->rcomp->compress_proto) { | |
1894 | case CI_MPPE: | |
1895 | obuff_size = ppp->mru + PPP_HDRLEN + 1; | |
1896 | break; | |
1897 | default: | |
1898 | obuff_size = ppp->mru + PPP_HDRLEN; | |
1899 | break; | |
1900 | } | |
1901 | ||
1902 | ns = dev_alloc_skb(obuff_size); | |
cd228d54 | 1903 | if (!ns) { |
b48f8c23 DM |
1904 | netdev_err(ppp->dev, "ppp_decompress_frame: " |
1905 | "no memory\n"); | |
1da177e4 LT |
1906 | goto err; |
1907 | } | |
1908 | /* the decompressor still expects the A/C bytes in the hdr */ | |
1909 | len = ppp->rcomp->decompress(ppp->rc_state, skb->data - 2, | |
06c7af56 | 1910 | skb->len + 2, ns->data, obuff_size); |
1da177e4 LT |
1911 | if (len < 0) { |
1912 | /* Pass the compressed frame to pppd as an | |
1913 | error indication. */ | |
1914 | if (len == DECOMP_FATALERROR) | |
1915 | ppp->rstate |= SC_DC_FERROR; | |
1916 | kfree_skb(ns); | |
1917 | goto err; | |
1918 | } | |
1919 | ||
968d7018 | 1920 | consume_skb(skb); |
1da177e4 LT |
1921 | skb = ns; |
1922 | skb_put(skb, len); | |
1923 | skb_pull(skb, 2); /* pull off the A/C bytes */ | |
1924 | ||
1925 | } else { | |
1926 | /* Uncompressed frame - pass to decompressor so it | |
1927 | can update its dictionary if necessary. */ | |
1928 | if (ppp->rcomp->incomp) | |
1929 | ppp->rcomp->incomp(ppp->rc_state, skb->data - 2, | |
1930 | skb->len + 2); | |
1931 | } | |
1932 | ||
1933 | return skb; | |
1934 | ||
1935 | err: | |
1936 | ppp->rstate |= SC_DC_ERROR; | |
1937 | ppp_receive_error(ppp); | |
1938 | return skb; | |
1939 | } | |
1940 | ||
1941 | #ifdef CONFIG_PPP_MULTILINK | |
1942 | /* | |
1943 | * Receive a multilink frame. | |
1944 | * We put it on the reconstruction queue and then pull off | |
1945 | * as many completed frames as we can. | |
1946 | */ | |
1947 | static void | |
1948 | ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) | |
1949 | { | |
1950 | u32 mask, seq; | |
81616c5a | 1951 | struct channel *ch; |
1da177e4 LT |
1952 | int mphdrlen = (ppp->flags & SC_MP_SHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN; |
1953 | ||
2a38b775 | 1954 | if (!pskb_may_pull(skb, mphdrlen + 1) || ppp->mrru == 0) |
1da177e4 LT |
1955 | goto err; /* no good, throw it away */ |
1956 | ||
1957 | /* Decode sequence number and begin/end bits */ | |
1958 | if (ppp->flags & SC_MP_SHORTSEQ) { | |
1959 | seq = ((skb->data[2] & 0x0f) << 8) | skb->data[3]; | |
1960 | mask = 0xfff; | |
1961 | } else { | |
1962 | seq = (skb->data[3] << 16) | (skb->data[4] << 8)| skb->data[5]; | |
1963 | mask = 0xffffff; | |
1964 | } | |
a00eac0c | 1965 | PPP_MP_CB(skb)->BEbits = skb->data[2]; |
1da177e4 LT |
1966 | skb_pull(skb, mphdrlen); /* pull off PPP and MP headers */ |
1967 | ||
1968 | /* | |
1969 | * Do protocol ID decompression on the first fragment of each packet. | |
1970 | */ | |
a00eac0c | 1971 | if ((PPP_MP_CB(skb)->BEbits & B) && (skb->data[0] & 1)) |
1da177e4 LT |
1972 | *skb_push(skb, 1) = 0; |
1973 | ||
1974 | /* | |
1975 | * Expand sequence number to 32 bits, making it as close | |
1976 | * as possible to ppp->minseq. | |
1977 | */ | |
1978 | seq |= ppp->minseq & ~mask; | |
1979 | if ((int)(ppp->minseq - seq) > (int)(mask >> 1)) | |
1980 | seq += mask + 1; | |
1981 | else if ((int)(seq - ppp->minseq) > (int)(mask >> 1)) | |
1982 | seq -= mask + 1; /* should never happen */ | |
a00eac0c | 1983 | PPP_MP_CB(skb)->sequence = seq; |
1da177e4 LT |
1984 | pch->lastseq = seq; |
1985 | ||
1986 | /* | |
1987 | * If this packet comes before the next one we were expecting, | |
1988 | * drop it. | |
1989 | */ | |
1990 | if (seq_before(seq, ppp->nextseq)) { | |
1991 | kfree_skb(skb); | |
8c0469cd | 1992 | ++ppp->dev->stats.rx_dropped; |
1da177e4 LT |
1993 | ppp_receive_error(ppp); |
1994 | return; | |
1995 | } | |
1996 | ||
1997 | /* | |
1998 | * Reevaluate minseq, the minimum over all channels of the | |
1999 | * last sequence number received on each channel. Because of | |
2000 | * the increasing sequence number rule, we know that any fragment | |
2001 | * before `minseq' which hasn't arrived is never going to arrive. | |
2002 | * The list of channels can't change because we have the receive | |
2003 | * side of the ppp unit locked. | |
2004 | */ | |
81616c5a | 2005 | list_for_each_entry(ch, &ppp->channels, clist) { |
1da177e4 LT |
2006 | if (seq_before(ch->lastseq, seq)) |
2007 | seq = ch->lastseq; | |
2008 | } | |
2009 | if (seq_before(ppp->minseq, seq)) | |
2010 | ppp->minseq = seq; | |
2011 | ||
2012 | /* Put the fragment on the reconstruction queue */ | |
2013 | ppp_mp_insert(ppp, skb); | |
2014 | ||
2015 | /* If the queue is getting long, don't wait any longer for packets | |
2016 | before the start of the queue. */ | |
38ce7c73 | 2017 | if (skb_queue_len(&ppp->mrq) >= PPP_MP_MAX_QLEN) { |
c6b20d94 | 2018 | struct sk_buff *mskb = skb_peek(&ppp->mrq); |
a00eac0c DM |
2019 | if (seq_before(ppp->minseq, PPP_MP_CB(mskb)->sequence)) |
2020 | ppp->minseq = PPP_MP_CB(mskb)->sequence; | |
38ce7c73 | 2021 | } |
1da177e4 LT |
2022 | |
2023 | /* Pull completed packets off the queue and receive them. */ | |
82b3cc1a BM |
2024 | while ((skb = ppp_mp_reconstruct(ppp))) { |
2025 | if (pskb_may_pull(skb, 2)) | |
2026 | ppp_receive_nonmp_frame(ppp, skb); | |
2027 | else { | |
2028 | ++ppp->dev->stats.rx_length_errors; | |
2029 | kfree_skb(skb); | |
2030 | ppp_receive_error(ppp); | |
2031 | } | |
2032 | } | |
1da177e4 LT |
2033 | |
2034 | return; | |
2035 | ||
2036 | err: | |
2037 | kfree_skb(skb); | |
2038 | ppp_receive_error(ppp); | |
2039 | } | |
2040 | ||
2041 | /* | |
2042 | * Insert a fragment on the MP reconstruction queue. | |
2043 | * The queue is ordered by increasing sequence number. | |
2044 | */ | |
2045 | static void | |
2046 | ppp_mp_insert(struct ppp *ppp, struct sk_buff *skb) | |
2047 | { | |
2048 | struct sk_buff *p; | |
2049 | struct sk_buff_head *list = &ppp->mrq; | |
a00eac0c | 2050 | u32 seq = PPP_MP_CB(skb)->sequence; |
1da177e4 LT |
2051 | |
2052 | /* N.B. we don't need to lock the list lock because we have the | |
2053 | ppp unit receive-side lock. */ | |
13c9821e | 2054 | skb_queue_walk(list, p) { |
a00eac0c | 2055 | if (seq_before(seq, PPP_MP_CB(p)->sequence)) |
1da177e4 | 2056 | break; |
13c9821e | 2057 | } |
43f59c89 | 2058 | __skb_queue_before(list, p, skb); |
1da177e4 LT |
2059 | } |
2060 | ||
2061 | /* | |
2062 | * Reconstruct a packet from the MP fragment queue. | |
2063 | * We go through increasing sequence numbers until we find a | |
2064 | * complete packet, or we get to the sequence number for a fragment | |
2065 | * which hasn't arrived but might still do so. | |
2066 | */ | |
3c582b30 | 2067 | static struct sk_buff * |
1da177e4 LT |
2068 | ppp_mp_reconstruct(struct ppp *ppp) |
2069 | { | |
2070 | u32 seq = ppp->nextseq; | |
2071 | u32 minseq = ppp->minseq; | |
2072 | struct sk_buff_head *list = &ppp->mrq; | |
d52344a7 | 2073 | struct sk_buff *p, *tmp; |
1da177e4 LT |
2074 | struct sk_buff *head, *tail; |
2075 | struct sk_buff *skb = NULL; | |
2076 | int lost = 0, len = 0; | |
2077 | ||
2078 | if (ppp->mrru == 0) /* do nothing until mrru is set */ | |
2079 | return NULL; | |
2080 | head = list->next; | |
2081 | tail = NULL; | |
d52344a7 DM |
2082 | skb_queue_walk_safe(list, p, tmp) { |
2083 | again: | |
a00eac0c | 2084 | if (seq_before(PPP_MP_CB(p)->sequence, seq)) { |
1da177e4 | 2085 | /* this can't happen, anyway ignore the skb */ |
b48f8c23 DM |
2086 | netdev_err(ppp->dev, "ppp_mp_reconstruct bad " |
2087 | "seq %u < %u\n", | |
2088 | PPP_MP_CB(p)->sequence, seq); | |
d52344a7 DM |
2089 | __skb_unlink(p, list); |
2090 | kfree_skb(p); | |
1da177e4 LT |
2091 | continue; |
2092 | } | |
a00eac0c | 2093 | if (PPP_MP_CB(p)->sequence != seq) { |
8a49ad6e | 2094 | u32 oldseq; |
1da177e4 LT |
2095 | /* Fragment `seq' is missing. If it is after |
2096 | minseq, it might arrive later, so stop here. */ | |
2097 | if (seq_after(seq, minseq)) | |
2098 | break; | |
2099 | /* Fragment `seq' is lost, keep going. */ | |
2100 | lost = 1; | |
8a49ad6e | 2101 | oldseq = seq; |
a00eac0c DM |
2102 | seq = seq_before(minseq, PPP_MP_CB(p)->sequence)? |
2103 | minseq + 1: PPP_MP_CB(p)->sequence; | |
8a49ad6e BM |
2104 | |
2105 | if (ppp->debug & 1) | |
2106 | netdev_printk(KERN_DEBUG, ppp->dev, | |
2107 | "lost frag %u..%u\n", | |
2108 | oldseq, seq-1); | |
2109 | ||
d52344a7 | 2110 | goto again; |
1da177e4 LT |
2111 | } |
2112 | ||
2113 | /* | |
2114 | * At this point we know that all the fragments from | |
2115 | * ppp->nextseq to seq are either present or lost. | |
2116 | * Also, there are no complete packets in the queue | |
2117 | * that have no missing fragments and end before this | |
2118 | * fragment. | |
2119 | */ | |
2120 | ||
2121 | /* B bit set indicates this fragment starts a packet */ | |
a00eac0c | 2122 | if (PPP_MP_CB(p)->BEbits & B) { |
1da177e4 LT |
2123 | head = p; |
2124 | lost = 0; | |
2125 | len = 0; | |
2126 | } | |
2127 | ||
2128 | len += p->len; | |
2129 | ||
2130 | /* Got a complete packet yet? */ | |
a00eac0c DM |
2131 | if (lost == 0 && (PPP_MP_CB(p)->BEbits & E) && |
2132 | (PPP_MP_CB(head)->BEbits & B)) { | |
1da177e4 | 2133 | if (len > ppp->mrru + 2) { |
8c0469cd | 2134 | ++ppp->dev->stats.rx_length_errors; |
b48f8c23 DM |
2135 | netdev_printk(KERN_DEBUG, ppp->dev, |
2136 | "PPP: reconstructed packet" | |
2137 | " is too long (%d)\n", len); | |
1da177e4 LT |
2138 | } else { |
2139 | tail = p; | |
2140 | break; | |
2141 | } | |
2142 | ppp->nextseq = seq + 1; | |
2143 | } | |
2144 | ||
2145 | /* | |
2146 | * If this is the ending fragment of a packet, | |
2147 | * and we haven't found a complete valid packet yet, | |
2148 | * we can discard up to and including this fragment. | |
2149 | */ | |
d52344a7 DM |
2150 | if (PPP_MP_CB(p)->BEbits & E) { |
2151 | struct sk_buff *tmp2; | |
1da177e4 | 2152 | |
d52344a7 | 2153 | skb_queue_reverse_walk_from_safe(list, p, tmp2) { |
8a49ad6e BM |
2154 | if (ppp->debug & 1) |
2155 | netdev_printk(KERN_DEBUG, ppp->dev, | |
2156 | "discarding frag %u\n", | |
2157 | PPP_MP_CB(p)->sequence); | |
d52344a7 DM |
2158 | __skb_unlink(p, list); |
2159 | kfree_skb(p); | |
2160 | } | |
2161 | head = skb_peek(list); | |
2162 | if (!head) | |
2163 | break; | |
2164 | } | |
1da177e4 LT |
2165 | ++seq; |
2166 | } | |
2167 | ||
2168 | /* If we have a complete packet, copy it all into one skb. */ | |
2169 | if (tail != NULL) { | |
2170 | /* If we have discarded any fragments, | |
2171 | signal a receive error. */ | |
a00eac0c | 2172 | if (PPP_MP_CB(head)->sequence != ppp->nextseq) { |
8a49ad6e BM |
2173 | skb_queue_walk_safe(list, p, tmp) { |
2174 | if (p == head) | |
2175 | break; | |
2176 | if (ppp->debug & 1) | |
2177 | netdev_printk(KERN_DEBUG, ppp->dev, | |
2178 | "discarding frag %u\n", | |
2179 | PPP_MP_CB(p)->sequence); | |
2180 | __skb_unlink(p, list); | |
2181 | kfree_skb(p); | |
2182 | } | |
2183 | ||
1da177e4 | 2184 | if (ppp->debug & 1) |
b48f8c23 DM |
2185 | netdev_printk(KERN_DEBUG, ppp->dev, |
2186 | " missed pkts %u..%u\n", | |
2187 | ppp->nextseq, | |
2188 | PPP_MP_CB(head)->sequence-1); | |
8c0469cd | 2189 | ++ppp->dev->stats.rx_dropped; |
1da177e4 LT |
2190 | ppp_receive_error(ppp); |
2191 | } | |
2192 | ||
212bfb9e DM |
2193 | skb = head; |
2194 | if (head != tail) { | |
2195 | struct sk_buff **fragpp = &skb_shinfo(skb)->frag_list; | |
2196 | p = skb_queue_next(list, head); | |
2197 | __skb_unlink(skb, list); | |
2198 | skb_queue_walk_from_safe(list, p, tmp) { | |
2199 | __skb_unlink(p, list); | |
2200 | *fragpp = p; | |
2201 | p->next = NULL; | |
2202 | fragpp = &p->next; | |
2203 | ||
2204 | skb->len += p->len; | |
2205 | skb->data_len += p->len; | |
19c6c8f5 | 2206 | skb->truesize += p->truesize; |
212bfb9e DM |
2207 | |
2208 | if (p == tail) | |
2209 | break; | |
2210 | } | |
2211 | } else { | |
2212 | __skb_unlink(skb, list); | |
2213 | } | |
2214 | ||
a00eac0c | 2215 | ppp->nextseq = PPP_MP_CB(tail)->sequence + 1; |
1da177e4 LT |
2216 | } |
2217 | ||
2218 | return skb; | |
2219 | } | |
2220 | #endif /* CONFIG_PPP_MULTILINK */ | |
2221 | ||
2222 | /* | |
2223 | * Channel interface. | |
2224 | */ | |
2225 | ||
273ec51d CG |
2226 | /* Create a new, unattached ppp channel. */ |
2227 | int ppp_register_channel(struct ppp_channel *chan) | |
2228 | { | |
2229 | return ppp_register_net_channel(current->nsproxy->net_ns, chan); | |
2230 | } | |
2231 | ||
2232 | /* Create a new, unattached ppp channel for specified net. */ | |
2233 | int ppp_register_net_channel(struct net *net, struct ppp_channel *chan) | |
1da177e4 LT |
2234 | { |
2235 | struct channel *pch; | |
273ec51d | 2236 | struct ppp_net *pn; |
1da177e4 | 2237 | |
d4274b51 | 2238 | pch = kzalloc(sizeof(struct channel), GFP_KERNEL); |
cd228d54 | 2239 | if (!pch) |
1da177e4 | 2240 | return -ENOMEM; |
273ec51d CG |
2241 | |
2242 | pn = ppp_pernet(net); | |
2243 | ||
1da177e4 LT |
2244 | pch->ppp = NULL; |
2245 | pch->chan = chan; | |
273ec51d | 2246 | pch->chan_net = net; |
1da177e4 LT |
2247 | chan->ppp = pch; |
2248 | init_ppp_file(&pch->file, CHANNEL); | |
2249 | pch->file.hdrlen = chan->hdrlen; | |
2250 | #ifdef CONFIG_PPP_MULTILINK | |
2251 | pch->lastseq = -1; | |
2252 | #endif /* CONFIG_PPP_MULTILINK */ | |
2253 | init_rwsem(&pch->chan_sem); | |
2254 | spin_lock_init(&pch->downl); | |
2255 | rwlock_init(&pch->upl); | |
273ec51d CG |
2256 | |
2257 | spin_lock_bh(&pn->all_channels_lock); | |
2258 | pch->file.index = ++pn->last_channel_index; | |
2259 | list_add(&pch->list, &pn->new_channels); | |
1da177e4 | 2260 | atomic_inc(&channel_count); |
273ec51d CG |
2261 | spin_unlock_bh(&pn->all_channels_lock); |
2262 | ||
1da177e4 LT |
2263 | return 0; |
2264 | } | |
2265 | ||
2266 | /* | |
2267 | * Return the index of a channel. | |
2268 | */ | |
2269 | int ppp_channel_index(struct ppp_channel *chan) | |
2270 | { | |
2271 | struct channel *pch = chan->ppp; | |
2272 | ||
cd228d54 | 2273 | if (pch) |
1da177e4 LT |
2274 | return pch->file.index; |
2275 | return -1; | |
2276 | } | |
2277 | ||
2278 | /* | |
2279 | * Return the PPP unit number to which a channel is connected. | |
2280 | */ | |
2281 | int ppp_unit_number(struct ppp_channel *chan) | |
2282 | { | |
2283 | struct channel *pch = chan->ppp; | |
2284 | int unit = -1; | |
2285 | ||
cd228d54 | 2286 | if (pch) { |
1da177e4 | 2287 | read_lock_bh(&pch->upl); |
cd228d54 | 2288 | if (pch->ppp) |
1da177e4 LT |
2289 | unit = pch->ppp->file.index; |
2290 | read_unlock_bh(&pch->upl); | |
2291 | } | |
2292 | return unit; | |
2293 | } | |
2294 | ||
63f96072 JC |
2295 | /* |
2296 | * Return the PPP device interface name of a channel. | |
2297 | */ | |
2298 | char *ppp_dev_name(struct ppp_channel *chan) | |
2299 | { | |
2300 | struct channel *pch = chan->ppp; | |
2301 | char *name = NULL; | |
2302 | ||
2303 | if (pch) { | |
2304 | read_lock_bh(&pch->upl); | |
2305 | if (pch->ppp && pch->ppp->dev) | |
2306 | name = pch->ppp->dev->name; | |
2307 | read_unlock_bh(&pch->upl); | |
2308 | } | |
2309 | return name; | |
2310 | } | |
2311 | ||
2312 | ||
1da177e4 LT |
2313 | /* |
2314 | * Disconnect a channel from the generic layer. | |
2315 | * This must be called in process context. | |
2316 | */ | |
2317 | void | |
2318 | ppp_unregister_channel(struct ppp_channel *chan) | |
2319 | { | |
2320 | struct channel *pch = chan->ppp; | |
273ec51d | 2321 | struct ppp_net *pn; |
1da177e4 | 2322 | |
cd228d54 | 2323 | if (!pch) |
1da177e4 | 2324 | return; /* should never happen */ |
273ec51d | 2325 | |
1da177e4 LT |
2326 | chan->ppp = NULL; |
2327 | ||
2328 | /* | |
2329 | * This ensures that we have returned from any calls into the | |
2330 | * the channel's start_xmit or ioctl routine before we proceed. | |
2331 | */ | |
2332 | down_write(&pch->chan_sem); | |
2333 | spin_lock_bh(&pch->downl); | |
2334 | pch->chan = NULL; | |
2335 | spin_unlock_bh(&pch->downl); | |
2336 | up_write(&pch->chan_sem); | |
2337 | ppp_disconnect_channel(pch); | |
273ec51d CG |
2338 | |
2339 | pn = ppp_pernet(pch->chan_net); | |
2340 | spin_lock_bh(&pn->all_channels_lock); | |
1da177e4 | 2341 | list_del(&pch->list); |
273ec51d CG |
2342 | spin_unlock_bh(&pn->all_channels_lock); |
2343 | ||
1da177e4 LT |
2344 | pch->file.dead = 1; |
2345 | wake_up_interruptible(&pch->file.rwait); | |
2346 | if (atomic_dec_and_test(&pch->file.refcnt)) | |
2347 | ppp_destroy_channel(pch); | |
2348 | } | |
2349 | ||
2350 | /* | |
2351 | * Callback from a channel when it can accept more to transmit. | |
2352 | * This should be called at BH/softirq level, not interrupt level. | |
2353 | */ | |
2354 | void | |
2355 | ppp_output_wakeup(struct ppp_channel *chan) | |
2356 | { | |
2357 | struct channel *pch = chan->ppp; | |
2358 | ||
cd228d54 | 2359 | if (!pch) |
1da177e4 LT |
2360 | return; |
2361 | ppp_channel_push(pch); | |
2362 | } | |
2363 | ||
2364 | /* | |
2365 | * Compression control. | |
2366 | */ | |
2367 | ||
2368 | /* Process the PPPIOCSCOMPRESS ioctl. */ | |
2369 | static int | |
2370 | ppp_set_compress(struct ppp *ppp, unsigned long arg) | |
2371 | { | |
2372 | int err; | |
2373 | struct compressor *cp, *ocomp; | |
2374 | struct ppp_option_data data; | |
2375 | void *state, *ostate; | |
2376 | unsigned char ccp_option[CCP_MAX_OPTION_LENGTH]; | |
2377 | ||
2378 | err = -EFAULT; | |
8e95a202 JP |
2379 | if (copy_from_user(&data, (void __user *) arg, sizeof(data)) || |
2380 | (data.length <= CCP_MAX_OPTION_LENGTH && | |
2381 | copy_from_user(ccp_option, (void __user *) data.ptr, data.length))) | |
1da177e4 LT |
2382 | goto out; |
2383 | err = -EINVAL; | |
8e95a202 JP |
2384 | if (data.length > CCP_MAX_OPTION_LENGTH || |
2385 | ccp_option[1] < 2 || ccp_option[1] > data.length) | |
1da177e4 LT |
2386 | goto out; |
2387 | ||
a65e5d78 JB |
2388 | cp = try_then_request_module( |
2389 | find_compressor(ccp_option[0]), | |
2390 | "ppp-compress-%d", ccp_option[0]); | |
cd228d54 | 2391 | if (!cp) |
1da177e4 LT |
2392 | goto out; |
2393 | ||
2394 | err = -ENOBUFS; | |
2395 | if (data.transmit) { | |
2396 | state = cp->comp_alloc(ccp_option, data.length); | |
cd228d54 | 2397 | if (state) { |
1da177e4 LT |
2398 | ppp_xmit_lock(ppp); |
2399 | ppp->xstate &= ~SC_COMP_RUN; | |
2400 | ocomp = ppp->xcomp; | |
2401 | ostate = ppp->xc_state; | |
2402 | ppp->xcomp = cp; | |
2403 | ppp->xc_state = state; | |
2404 | ppp_xmit_unlock(ppp); | |
cd228d54 | 2405 | if (ostate) { |
1da177e4 LT |
2406 | ocomp->comp_free(ostate); |
2407 | module_put(ocomp->owner); | |
2408 | } | |
2409 | err = 0; | |
2410 | } else | |
2411 | module_put(cp->owner); | |
2412 | ||
2413 | } else { | |
2414 | state = cp->decomp_alloc(ccp_option, data.length); | |
cd228d54 | 2415 | if (state) { |
1da177e4 LT |
2416 | ppp_recv_lock(ppp); |
2417 | ppp->rstate &= ~SC_DECOMP_RUN; | |
2418 | ocomp = ppp->rcomp; | |
2419 | ostate = ppp->rc_state; | |
2420 | ppp->rcomp = cp; | |
2421 | ppp->rc_state = state; | |
2422 | ppp_recv_unlock(ppp); | |
cd228d54 | 2423 | if (ostate) { |
1da177e4 LT |
2424 | ocomp->decomp_free(ostate); |
2425 | module_put(ocomp->owner); | |
2426 | } | |
2427 | err = 0; | |
2428 | } else | |
2429 | module_put(cp->owner); | |
2430 | } | |
2431 | ||
2432 | out: | |
2433 | return err; | |
2434 | } | |
2435 | ||
2436 | /* | |
2437 | * Look at a CCP packet and update our state accordingly. | |
2438 | * We assume the caller has the xmit or recv path locked. | |
2439 | */ | |
2440 | static void | |
2441 | ppp_ccp_peek(struct ppp *ppp, struct sk_buff *skb, int inbound) | |
2442 | { | |
2443 | unsigned char *dp; | |
2444 | int len; | |
2445 | ||
2446 | if (!pskb_may_pull(skb, CCP_HDRLEN + 2)) | |
2447 | return; /* no header */ | |
2448 | dp = skb->data + 2; | |
2449 | ||
2450 | switch (CCP_CODE(dp)) { | |
2451 | case CCP_CONFREQ: | |
2452 | ||
6aa20a22 | 2453 | /* A ConfReq starts negotiation of compression |
1da177e4 LT |
2454 | * in one direction of transmission, |
2455 | * and hence brings it down...but which way? | |
2456 | * | |
2457 | * Remember: | |
2458 | * A ConfReq indicates what the sender would like to receive | |
2459 | */ | |
2460 | if(inbound) | |
2461 | /* He is proposing what I should send */ | |
2462 | ppp->xstate &= ~SC_COMP_RUN; | |
6aa20a22 | 2463 | else |
1da177e4 LT |
2464 | /* I am proposing to what he should send */ |
2465 | ppp->rstate &= ~SC_DECOMP_RUN; | |
6aa20a22 | 2466 | |
1da177e4 | 2467 | break; |
6aa20a22 | 2468 | |
1da177e4 LT |
2469 | case CCP_TERMREQ: |
2470 | case CCP_TERMACK: | |
2471 | /* | |
6aa20a22 | 2472 | * CCP is going down, both directions of transmission |
1da177e4 LT |
2473 | */ |
2474 | ppp->rstate &= ~SC_DECOMP_RUN; | |
2475 | ppp->xstate &= ~SC_COMP_RUN; | |
2476 | break; | |
2477 | ||
2478 | case CCP_CONFACK: | |
2479 | if ((ppp->flags & (SC_CCP_OPEN | SC_CCP_UP)) != SC_CCP_OPEN) | |
2480 | break; | |
2481 | len = CCP_LENGTH(dp); | |
2482 | if (!pskb_may_pull(skb, len + 2)) | |
2483 | return; /* too short */ | |
2484 | dp += CCP_HDRLEN; | |
2485 | len -= CCP_HDRLEN; | |
2486 | if (len < CCP_OPT_MINLEN || len < CCP_OPT_LENGTH(dp)) | |
2487 | break; | |
2488 | if (inbound) { | |
2489 | /* we will start receiving compressed packets */ | |
cd228d54 | 2490 | if (!ppp->rc_state) |
1da177e4 LT |
2491 | break; |
2492 | if (ppp->rcomp->decomp_init(ppp->rc_state, dp, len, | |
2493 | ppp->file.index, 0, ppp->mru, ppp->debug)) { | |
2494 | ppp->rstate |= SC_DECOMP_RUN; | |
2495 | ppp->rstate &= ~(SC_DC_ERROR | SC_DC_FERROR); | |
2496 | } | |
2497 | } else { | |
2498 | /* we will soon start sending compressed packets */ | |
cd228d54 | 2499 | if (!ppp->xc_state) |
1da177e4 LT |
2500 | break; |
2501 | if (ppp->xcomp->comp_init(ppp->xc_state, dp, len, | |
2502 | ppp->file.index, 0, ppp->debug)) | |
2503 | ppp->xstate |= SC_COMP_RUN; | |
2504 | } | |
2505 | break; | |
2506 | ||
2507 | case CCP_RESETACK: | |
2508 | /* reset the [de]compressor */ | |
2509 | if ((ppp->flags & SC_CCP_UP) == 0) | |
2510 | break; | |
2511 | if (inbound) { | |
2512 | if (ppp->rc_state && (ppp->rstate & SC_DECOMP_RUN)) { | |
2513 | ppp->rcomp->decomp_reset(ppp->rc_state); | |
2514 | ppp->rstate &= ~SC_DC_ERROR; | |
2515 | } | |
2516 | } else { | |
2517 | if (ppp->xc_state && (ppp->xstate & SC_COMP_RUN)) | |
2518 | ppp->xcomp->comp_reset(ppp->xc_state); | |
2519 | } | |
2520 | break; | |
2521 | } | |
2522 | } | |
2523 | ||
2524 | /* Free up compression resources. */ | |
2525 | static void | |
2526 | ppp_ccp_closed(struct ppp *ppp) | |
2527 | { | |
2528 | void *xstate, *rstate; | |
2529 | struct compressor *xcomp, *rcomp; | |
2530 | ||
2531 | ppp_lock(ppp); | |
2532 | ppp->flags &= ~(SC_CCP_OPEN | SC_CCP_UP); | |
2533 | ppp->xstate = 0; | |
2534 | xcomp = ppp->xcomp; | |
2535 | xstate = ppp->xc_state; | |
2536 | ppp->xc_state = NULL; | |
2537 | ppp->rstate = 0; | |
2538 | rcomp = ppp->rcomp; | |
2539 | rstate = ppp->rc_state; | |
2540 | ppp->rc_state = NULL; | |
2541 | ppp_unlock(ppp); | |
2542 | ||
2543 | if (xstate) { | |
2544 | xcomp->comp_free(xstate); | |
2545 | module_put(xcomp->owner); | |
2546 | } | |
2547 | if (rstate) { | |
2548 | rcomp->decomp_free(rstate); | |
2549 | module_put(rcomp->owner); | |
2550 | } | |
2551 | } | |
2552 | ||
2553 | /* List of compressors. */ | |
2554 | static LIST_HEAD(compressor_list); | |
2555 | static DEFINE_SPINLOCK(compressor_list_lock); | |
2556 | ||
2557 | struct compressor_entry { | |
2558 | struct list_head list; | |
2559 | struct compressor *comp; | |
2560 | }; | |
2561 | ||
2562 | static struct compressor_entry * | |
2563 | find_comp_entry(int proto) | |
2564 | { | |
2565 | struct compressor_entry *ce; | |
1da177e4 | 2566 | |
81616c5a | 2567 | list_for_each_entry(ce, &compressor_list, list) { |
1da177e4 LT |
2568 | if (ce->comp->compress_proto == proto) |
2569 | return ce; | |
2570 | } | |
2571 | return NULL; | |
2572 | } | |
2573 | ||
2574 | /* Register a compressor */ | |
2575 | int | |
2576 | ppp_register_compressor(struct compressor *cp) | |
2577 | { | |
2578 | struct compressor_entry *ce; | |
2579 | int ret; | |
2580 | spin_lock(&compressor_list_lock); | |
2581 | ret = -EEXIST; | |
cd228d54 | 2582 | if (find_comp_entry(cp->compress_proto)) |
1da177e4 LT |
2583 | goto out; |
2584 | ret = -ENOMEM; | |
2585 | ce = kmalloc(sizeof(struct compressor_entry), GFP_ATOMIC); | |
cd228d54 | 2586 | if (!ce) |
1da177e4 LT |
2587 | goto out; |
2588 | ret = 0; | |
2589 | ce->comp = cp; | |
2590 | list_add(&ce->list, &compressor_list); | |
2591 | out: | |
2592 | spin_unlock(&compressor_list_lock); | |
2593 | return ret; | |
2594 | } | |
2595 | ||
2596 | /* Unregister a compressor */ | |
2597 | void | |
2598 | ppp_unregister_compressor(struct compressor *cp) | |
2599 | { | |
2600 | struct compressor_entry *ce; | |
2601 | ||
2602 | spin_lock(&compressor_list_lock); | |
2603 | ce = find_comp_entry(cp->compress_proto); | |
cd228d54 | 2604 | if (ce && ce->comp == cp) { |
1da177e4 LT |
2605 | list_del(&ce->list); |
2606 | kfree(ce); | |
2607 | } | |
2608 | spin_unlock(&compressor_list_lock); | |
2609 | } | |
2610 | ||
2611 | /* Find a compressor. */ | |
2612 | static struct compressor * | |
2613 | find_compressor(int type) | |
2614 | { | |
2615 | struct compressor_entry *ce; | |
2616 | struct compressor *cp = NULL; | |
2617 | ||
2618 | spin_lock(&compressor_list_lock); | |
2619 | ce = find_comp_entry(type); | |
cd228d54 | 2620 | if (ce) { |
1da177e4 LT |
2621 | cp = ce->comp; |
2622 | if (!try_module_get(cp->owner)) | |
2623 | cp = NULL; | |
2624 | } | |
2625 | spin_unlock(&compressor_list_lock); | |
2626 | return cp; | |
2627 | } | |
2628 | ||
2629 | /* | |
2630 | * Miscelleneous stuff. | |
2631 | */ | |
2632 | ||
2633 | static void | |
2634 | ppp_get_stats(struct ppp *ppp, struct ppp_stats *st) | |
2635 | { | |
2636 | struct slcompress *vj = ppp->vj; | |
2637 | ||
2638 | memset(st, 0, sizeof(*st)); | |
e51f6ff3 | 2639 | st->p.ppp_ipackets = ppp->stats64.rx_packets; |
8c0469cd | 2640 | st->p.ppp_ierrors = ppp->dev->stats.rx_errors; |
e51f6ff3 KG |
2641 | st->p.ppp_ibytes = ppp->stats64.rx_bytes; |
2642 | st->p.ppp_opackets = ppp->stats64.tx_packets; | |
8c0469cd | 2643 | st->p.ppp_oerrors = ppp->dev->stats.tx_errors; |
e51f6ff3 | 2644 | st->p.ppp_obytes = ppp->stats64.tx_bytes; |
cd228d54 | 2645 | if (!vj) |
1da177e4 LT |
2646 | return; |
2647 | st->vj.vjs_packets = vj->sls_o_compressed + vj->sls_o_uncompressed; | |
2648 | st->vj.vjs_compressed = vj->sls_o_compressed; | |
2649 | st->vj.vjs_searches = vj->sls_o_searches; | |
2650 | st->vj.vjs_misses = vj->sls_o_misses; | |
2651 | st->vj.vjs_errorin = vj->sls_i_error; | |
2652 | st->vj.vjs_tossed = vj->sls_i_tossed; | |
2653 | st->vj.vjs_uncompressedin = vj->sls_i_uncompressed; | |
2654 | st->vj.vjs_compressedin = vj->sls_i_compressed; | |
2655 | } | |
2656 | ||
2657 | /* | |
2658 | * Stuff for handling the lists of ppp units and channels | |
2659 | * and for initialization. | |
2660 | */ | |
2661 | ||
2662 | /* | |
2663 | * Create a new ppp interface unit. Fails if it can't allocate memory | |
2664 | * or if there is already a unit with the requested number. | |
2665 | * unit == -1 means allocate a new number. | |
2666 | */ | |
2667 | static struct ppp * | |
273ec51d | 2668 | ppp_create_interface(struct net *net, int unit, int *retp) |
1da177e4 LT |
2669 | { |
2670 | struct ppp *ppp; | |
273ec51d | 2671 | struct ppp_net *pn; |
1da177e4 LT |
2672 | struct net_device *dev = NULL; |
2673 | int ret = -ENOMEM; | |
2674 | int i; | |
2675 | ||
c835a677 TG |
2676 | dev = alloc_netdev(sizeof(struct ppp), "", NET_NAME_UNKNOWN, |
2677 | ppp_setup); | |
1da177e4 LT |
2678 | if (!dev) |
2679 | goto out1; | |
1da177e4 | 2680 | |
273ec51d CG |
2681 | pn = ppp_pernet(net); |
2682 | ||
c8019bf3 WC |
2683 | ppp = netdev_priv(dev); |
2684 | ppp->dev = dev; | |
1da177e4 LT |
2685 | ppp->mru = PPP_MRU; |
2686 | init_ppp_file(&ppp->file, INTERFACE); | |
2687 | ppp->file.hdrlen = PPP_HDRLEN - 2; /* don't count proto bytes */ | |
2688 | for (i = 0; i < NUM_NP; ++i) | |
2689 | ppp->npmode[i] = NPMODE_PASS; | |
2690 | INIT_LIST_HEAD(&ppp->channels); | |
2691 | spin_lock_init(&ppp->rlock); | |
2692 | spin_lock_init(&ppp->wlock); | |
2693 | #ifdef CONFIG_PPP_MULTILINK | |
2694 | ppp->minseq = -1; | |
2695 | skb_queue_head_init(&ppp->mrq); | |
2696 | #endif /* CONFIG_PPP_MULTILINK */ | |
568f194e DB |
2697 | #ifdef CONFIG_PPP_FILTER |
2698 | ppp->pass_filter = NULL; | |
2699 | ppp->active_filter = NULL; | |
2700 | #endif /* CONFIG_PPP_FILTER */ | |
1da177e4 | 2701 | |
273ec51d CG |
2702 | /* |
2703 | * drum roll: don't forget to set | |
2704 | * the net device is belong to | |
2705 | */ | |
2706 | dev_net_set(dev, net); | |
2707 | ||
273ec51d | 2708 | mutex_lock(&pn->all_ppp_mutex); |
7a95d267 CG |
2709 | |
2710 | if (unit < 0) { | |
273ec51d | 2711 | unit = unit_get(&pn->units_idr, ppp); |
7a95d267 | 2712 | if (unit < 0) { |
bcc70bb3 | 2713 | ret = unit; |
7a95d267 CG |
2714 | goto out2; |
2715 | } | |
2716 | } else { | |
bcc70bb3 | 2717 | ret = -EEXIST; |
273ec51d | 2718 | if (unit_find(&pn->units_idr, unit)) |
7a95d267 | 2719 | goto out2; /* unit already exists */ |
85997576 CG |
2720 | /* |
2721 | * if caller need a specified unit number | |
2722 | * lets try to satisfy him, otherwise -- | |
2723 | * he should better ask us for new unit number | |
2724 | * | |
2725 | * NOTE: yes I know that returning EEXIST it's not | |
2726 | * fair but at least pppd will ask us to allocate | |
2727 | * new unit in this case so user is happy :) | |
2728 | */ | |
273ec51d | 2729 | unit = unit_set(&pn->units_idr, ppp, unit); |
85997576 | 2730 | if (unit < 0) |
7a95d267 | 2731 | goto out2; |
7a95d267 | 2732 | } |
1da177e4 LT |
2733 | |
2734 | /* Initialize the new ppp unit */ | |
2735 | ppp->file.index = unit; | |
2736 | sprintf(dev->name, "ppp%d", unit); | |
2737 | ||
2738 | ret = register_netdev(dev); | |
2739 | if (ret != 0) { | |
273ec51d | 2740 | unit_put(&pn->units_idr, unit); |
b48f8c23 DM |
2741 | netdev_err(ppp->dev, "PPP: couldn't register device %s (%d)\n", |
2742 | dev->name, ret); | |
1da177e4 LT |
2743 | goto out2; |
2744 | } | |
2745 | ||
273ec51d CG |
2746 | ppp->ppp_net = net; |
2747 | ||
1da177e4 | 2748 | atomic_inc(&ppp_unit_count); |
273ec51d | 2749 | mutex_unlock(&pn->all_ppp_mutex); |
7a95d267 | 2750 | |
1da177e4 LT |
2751 | *retp = 0; |
2752 | return ppp; | |
2753 | ||
2754 | out2: | |
273ec51d | 2755 | mutex_unlock(&pn->all_ppp_mutex); |
1da177e4 LT |
2756 | free_netdev(dev); |
2757 | out1: | |
1da177e4 LT |
2758 | *retp = ret; |
2759 | return NULL; | |
2760 | } | |
2761 | ||
2762 | /* | |
2763 | * Initialize a ppp_file structure. | |
2764 | */ | |
2765 | static void | |
2766 | init_ppp_file(struct ppp_file *pf, int kind) | |
2767 | { | |
2768 | pf->kind = kind; | |
2769 | skb_queue_head_init(&pf->xq); | |
2770 | skb_queue_head_init(&pf->rq); | |
2771 | atomic_set(&pf->refcnt, 1); | |
2772 | init_waitqueue_head(&pf->rwait); | |
2773 | } | |
2774 | ||
2775 | /* | |
2776 | * Take down a ppp interface unit - called when the owning file | |
2777 | * (the one that created the unit) is closed or detached. | |
2778 | */ | |
2779 | static void ppp_shutdown_interface(struct ppp *ppp) | |
2780 | { | |
273ec51d CG |
2781 | struct ppp_net *pn; |
2782 | ||
2783 | pn = ppp_pernet(ppp->ppp_net); | |
2784 | mutex_lock(&pn->all_ppp_mutex); | |
2785 | ||
1da177e4 | 2786 | /* This will call dev_close() for us. */ |
739840d5 JC |
2787 | ppp_lock(ppp); |
2788 | if (!ppp->closing) { | |
2789 | ppp->closing = 1; | |
2790 | ppp_unlock(ppp); | |
2791 | unregister_netdev(ppp->dev); | |
bcc70bb3 | 2792 | unit_put(&pn->units_idr, ppp->file.index); |
739840d5 JC |
2793 | } else |
2794 | ppp_unlock(ppp); | |
2795 | ||
1da177e4 LT |
2796 | ppp->file.dead = 1; |
2797 | ppp->owner = NULL; | |
2798 | wake_up_interruptible(&ppp->file.rwait); | |
273ec51d CG |
2799 | |
2800 | mutex_unlock(&pn->all_ppp_mutex); | |
1da177e4 LT |
2801 | } |
2802 | ||
2803 | /* | |
2804 | * Free the memory used by a ppp unit. This is only called once | |
2805 | * there are no channels connected to the unit and no file structs | |
2806 | * that reference the unit. | |
2807 | */ | |
2808 | static void ppp_destroy_interface(struct ppp *ppp) | |
2809 | { | |
2810 | atomic_dec(&ppp_unit_count); | |
2811 | ||
2812 | if (!ppp->file.dead || ppp->n_channels) { | |
2813 | /* "can't happen" */ | |
b48f8c23 DM |
2814 | netdev_err(ppp->dev, "ppp: destroying ppp struct %p " |
2815 | "but dead=%d n_channels=%d !\n", | |
2816 | ppp, ppp->file.dead, ppp->n_channels); | |
1da177e4 LT |
2817 | return; |
2818 | } | |
2819 | ||
2820 | ppp_ccp_closed(ppp); | |
2821 | if (ppp->vj) { | |
2822 | slhc_free(ppp->vj); | |
2823 | ppp->vj = NULL; | |
2824 | } | |
2825 | skb_queue_purge(&ppp->file.xq); | |
2826 | skb_queue_purge(&ppp->file.rq); | |
2827 | #ifdef CONFIG_PPP_MULTILINK | |
2828 | skb_queue_purge(&ppp->mrq); | |
2829 | #endif /* CONFIG_PPP_MULTILINK */ | |
2830 | #ifdef CONFIG_PPP_FILTER | |
568f194e | 2831 | if (ppp->pass_filter) { |
7ae457c1 | 2832 | bpf_prog_destroy(ppp->pass_filter); |
568f194e DB |
2833 | ppp->pass_filter = NULL; |
2834 | } | |
2835 | ||
2836 | if (ppp->active_filter) { | |
7ae457c1 | 2837 | bpf_prog_destroy(ppp->active_filter); |
568f194e DB |
2838 | ppp->active_filter = NULL; |
2839 | } | |
1da177e4 LT |
2840 | #endif /* CONFIG_PPP_FILTER */ |
2841 | ||
1d2f8c95 | 2842 | kfree_skb(ppp->xmit_pending); |
165de5b7 | 2843 | |
739840d5 | 2844 | free_netdev(ppp->dev); |
1da177e4 LT |
2845 | } |
2846 | ||
2847 | /* | |
2848 | * Locate an existing ppp unit. | |
8ed965d6 | 2849 | * The caller should have locked the all_ppp_mutex. |
1da177e4 LT |
2850 | */ |
2851 | static struct ppp * | |
273ec51d | 2852 | ppp_find_unit(struct ppp_net *pn, int unit) |
1da177e4 | 2853 | { |
273ec51d | 2854 | return unit_find(&pn->units_idr, unit); |
1da177e4 LT |
2855 | } |
2856 | ||
2857 | /* | |
2858 | * Locate an existing ppp channel. | |
2859 | * The caller should have locked the all_channels_lock. | |
2860 | * First we look in the new_channels list, then in the | |
2861 | * all_channels list. If found in the new_channels list, | |
2862 | * we move it to the all_channels list. This is for speed | |
2863 | * when we have a lot of channels in use. | |
2864 | */ | |
2865 | static struct channel * | |
273ec51d | 2866 | ppp_find_channel(struct ppp_net *pn, int unit) |
1da177e4 LT |
2867 | { |
2868 | struct channel *pch; | |
1da177e4 | 2869 | |
273ec51d | 2870 | list_for_each_entry(pch, &pn->new_channels, list) { |
1da177e4 | 2871 | if (pch->file.index == unit) { |
273ec51d | 2872 | list_move(&pch->list, &pn->all_channels); |
1da177e4 LT |
2873 | return pch; |
2874 | } | |
2875 | } | |
273ec51d CG |
2876 | |
2877 | list_for_each_entry(pch, &pn->all_channels, list) { | |
1da177e4 LT |
2878 | if (pch->file.index == unit) |
2879 | return pch; | |
2880 | } | |
273ec51d | 2881 | |
1da177e4 LT |
2882 | return NULL; |
2883 | } | |
2884 | ||
2885 | /* | |
2886 | * Connect a PPP channel to a PPP interface unit. | |
2887 | */ | |
2888 | static int | |
2889 | ppp_connect_channel(struct channel *pch, int unit) | |
2890 | { | |
2891 | struct ppp *ppp; | |
273ec51d | 2892 | struct ppp_net *pn; |
1da177e4 LT |
2893 | int ret = -ENXIO; |
2894 | int hdrlen; | |
2895 | ||
273ec51d CG |
2896 | pn = ppp_pernet(pch->chan_net); |
2897 | ||
2898 | mutex_lock(&pn->all_ppp_mutex); | |
2899 | ppp = ppp_find_unit(pn, unit); | |
cd228d54 | 2900 | if (!ppp) |
1da177e4 LT |
2901 | goto out; |
2902 | write_lock_bh(&pch->upl); | |
2903 | ret = -EINVAL; | |
cd228d54 | 2904 | if (pch->ppp) |
1da177e4 LT |
2905 | goto outl; |
2906 | ||
2907 | ppp_lock(ppp); | |
2908 | if (pch->file.hdrlen > ppp->file.hdrlen) | |
2909 | ppp->file.hdrlen = pch->file.hdrlen; | |
2910 | hdrlen = pch->file.hdrlen + 2; /* for protocol bytes */ | |
739840d5 | 2911 | if (hdrlen > ppp->dev->hard_header_len) |
1da177e4 LT |
2912 | ppp->dev->hard_header_len = hdrlen; |
2913 | list_add_tail(&pch->clist, &ppp->channels); | |
2914 | ++ppp->n_channels; | |
2915 | pch->ppp = ppp; | |
2916 | atomic_inc(&ppp->file.refcnt); | |
2917 | ppp_unlock(ppp); | |
2918 | ret = 0; | |
2919 | ||
2920 | outl: | |
2921 | write_unlock_bh(&pch->upl); | |
2922 | out: | |
273ec51d | 2923 | mutex_unlock(&pn->all_ppp_mutex); |
1da177e4 LT |
2924 | return ret; |
2925 | } | |
2926 | ||
2927 | /* | |
2928 | * Disconnect a channel from its ppp unit. | |
2929 | */ | |
2930 | static int | |
2931 | ppp_disconnect_channel(struct channel *pch) | |
2932 | { | |
2933 | struct ppp *ppp; | |
2934 | int err = -EINVAL; | |
2935 | ||
2936 | write_lock_bh(&pch->upl); | |
2937 | ppp = pch->ppp; | |
2938 | pch->ppp = NULL; | |
2939 | write_unlock_bh(&pch->upl); | |
cd228d54 | 2940 | if (ppp) { |
1da177e4 LT |
2941 | /* remove it from the ppp unit's list */ |
2942 | ppp_lock(ppp); | |
2943 | list_del(&pch->clist); | |
2944 | if (--ppp->n_channels == 0) | |
2945 | wake_up_interruptible(&ppp->file.rwait); | |
2946 | ppp_unlock(ppp); | |
2947 | if (atomic_dec_and_test(&ppp->file.refcnt)) | |
2948 | ppp_destroy_interface(ppp); | |
2949 | err = 0; | |
2950 | } | |
2951 | return err; | |
2952 | } | |
2953 | ||
2954 | /* | |
2955 | * Free up the resources used by a ppp channel. | |
2956 | */ | |
2957 | static void ppp_destroy_channel(struct channel *pch) | |
2958 | { | |
2959 | atomic_dec(&channel_count); | |
2960 | ||
2961 | if (!pch->file.dead) { | |
2962 | /* "can't happen" */ | |
b48f8c23 | 2963 | pr_err("ppp: destroying undead channel %p !\n", pch); |
1da177e4 LT |
2964 | return; |
2965 | } | |
2966 | skb_queue_purge(&pch->file.xq); | |
2967 | skb_queue_purge(&pch->file.rq); | |
2968 | kfree(pch); | |
2969 | } | |
2970 | ||
2971 | static void __exit ppp_cleanup(void) | |
2972 | { | |
2973 | /* should never happen */ | |
2974 | if (atomic_read(&ppp_unit_count) || atomic_read(&channel_count)) | |
b48f8c23 | 2975 | pr_err("PPP: removing module but units remain!\n"); |
68fc4fab | 2976 | unregister_chrdev(PPP_MAJOR, "ppp"); |
9a6a2a5e | 2977 | device_destroy(ppp_class, MKDEV(PPP_MAJOR, 0)); |
56b22935 | 2978 | class_destroy(ppp_class); |
741a6fa2 | 2979 | unregister_pernet_device(&ppp_net_ops); |
1da177e4 LT |
2980 | } |
2981 | ||
2982 | /* | |
7a95d267 CG |
2983 | * Units handling. Caller must protect concurrent access |
2984 | * by holding all_ppp_mutex | |
1da177e4 | 2985 | */ |
7a95d267 | 2986 | |
bcc70bb3 CG |
2987 | /* associate pointer with specified number */ |
2988 | static int unit_set(struct idr *p, void *ptr, int n) | |
2989 | { | |
2990 | int unit; | |
85997576 | 2991 | |
2fa532c5 TH |
2992 | unit = idr_alloc(p, ptr, n, n + 1, GFP_KERNEL); |
2993 | if (unit == -ENOSPC) | |
2994 | unit = -EINVAL; | |
85997576 CG |
2995 | return unit; |
2996 | } | |
2997 | ||
7a95d267 CG |
2998 | /* get new free unit number and associate pointer with it */ |
2999 | static int unit_get(struct idr *p, void *ptr) | |
1da177e4 | 3000 | { |
2fa532c5 | 3001 | return idr_alloc(p, ptr, 0, 0, GFP_KERNEL); |
1da177e4 LT |
3002 | } |
3003 | ||
7a95d267 CG |
3004 | /* put unit number back to a pool */ |
3005 | static void unit_put(struct idr *p, int n) | |
1da177e4 | 3006 | { |
7a95d267 | 3007 | idr_remove(p, n); |
1da177e4 LT |
3008 | } |
3009 | ||
7a95d267 CG |
3010 | /* get pointer associated with the number */ |
3011 | static void *unit_find(struct idr *p, int n) | |
1da177e4 | 3012 | { |
7a95d267 | 3013 | return idr_find(p, n); |
1da177e4 LT |
3014 | } |
3015 | ||
3016 | /* Module/initialization stuff */ | |
3017 | ||
3018 | module_init(ppp_init); | |
3019 | module_exit(ppp_cleanup); | |
3020 | ||
273ec51d | 3021 | EXPORT_SYMBOL(ppp_register_net_channel); |
1da177e4 LT |
3022 | EXPORT_SYMBOL(ppp_register_channel); |
3023 | EXPORT_SYMBOL(ppp_unregister_channel); | |
3024 | EXPORT_SYMBOL(ppp_channel_index); | |
3025 | EXPORT_SYMBOL(ppp_unit_number); | |
63f96072 | 3026 | EXPORT_SYMBOL(ppp_dev_name); |
1da177e4 LT |
3027 | EXPORT_SYMBOL(ppp_input); |
3028 | EXPORT_SYMBOL(ppp_input_error); | |
3029 | EXPORT_SYMBOL(ppp_output_wakeup); | |
3030 | EXPORT_SYMBOL(ppp_register_compressor); | |
3031 | EXPORT_SYMBOL(ppp_unregister_compressor); | |
3032 | MODULE_LICENSE("GPL"); | |
578454ff KS |
3033 | MODULE_ALIAS_CHARDEV(PPP_MAJOR, 0); |
3034 | MODULE_ALIAS("devname:ppp"); |