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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> | |
174cd4b1 | 27 | #include <linux/sched/signal.h> |
1da177e4 LT |
28 | #include <linux/kmod.h> |
29 | #include <linux/init.h> | |
30 | #include <linux/list.h> | |
7a95d267 | 31 | #include <linux/idr.h> |
1da177e4 LT |
32 | #include <linux/netdevice.h> |
33 | #include <linux/poll.h> | |
34 | #include <linux/ppp_defs.h> | |
35 | #include <linux/filter.h> | |
bf7daebb | 36 | #include <linux/ppp-ioctl.h> |
1da177e4 LT |
37 | #include <linux/ppp_channel.h> |
38 | #include <linux/ppp-comp.h> | |
39 | #include <linux/skbuff.h> | |
40 | #include <linux/rtnetlink.h> | |
41 | #include <linux/if_arp.h> | |
42 | #include <linux/ip.h> | |
43 | #include <linux/tcp.h> | |
44 | #include <linux/spinlock.h> | |
1da177e4 LT |
45 | #include <linux/rwsem.h> |
46 | #include <linux/stddef.h> | |
47 | #include <linux/device.h> | |
8ed965d6 | 48 | #include <linux/mutex.h> |
5a0e3ad6 | 49 | #include <linux/slab.h> |
96d934c7 | 50 | #include <linux/file.h> |
96545aeb | 51 | #include <asm/unaligned.h> |
1da177e4 | 52 | #include <net/slhc_vj.h> |
60063497 | 53 | #include <linux/atomic.h> |
1da177e4 | 54 | |
273ec51d CG |
55 | #include <linux/nsproxy.h> |
56 | #include <net/net_namespace.h> | |
57 | #include <net/netns/generic.h> | |
58 | ||
1da177e4 LT |
59 | #define PPP_VERSION "2.4.2" |
60 | ||
61 | /* | |
62 | * Network protocols we support. | |
63 | */ | |
64 | #define NP_IP 0 /* Internet Protocol V4 */ | |
65 | #define NP_IPV6 1 /* Internet Protocol V6 */ | |
66 | #define NP_IPX 2 /* IPX protocol */ | |
67 | #define NP_AT 3 /* Appletalk protocol */ | |
68 | #define NP_MPLS_UC 4 /* MPLS unicast */ | |
69 | #define NP_MPLS_MC 5 /* MPLS multicast */ | |
70 | #define NUM_NP 6 /* Number of NPs. */ | |
71 | ||
72 | #define MPHDRLEN 6 /* multilink protocol header length */ | |
73 | #define MPHDRLEN_SSN 4 /* ditto with short sequence numbers */ | |
1da177e4 LT |
74 | |
75 | /* | |
76 | * An instance of /dev/ppp can be associated with either a ppp | |
77 | * interface unit or a ppp channel. In both cases, file->private_data | |
78 | * points to one of these. | |
79 | */ | |
80 | struct ppp_file { | |
81 | enum { | |
82 | INTERFACE=1, CHANNEL | |
83 | } kind; | |
84 | struct sk_buff_head xq; /* pppd transmit queue */ | |
85 | struct sk_buff_head rq; /* receive queue for pppd */ | |
86 | wait_queue_head_t rwait; /* for poll on reading /dev/ppp */ | |
87 | atomic_t refcnt; /* # refs (incl /dev/ppp attached) */ | |
88 | int hdrlen; /* space to leave for headers */ | |
89 | int index; /* interface unit / channel number */ | |
90 | int dead; /* unit/channel has been shut down */ | |
91 | }; | |
92 | ||
b385a144 | 93 | #define PF_TO_X(pf, X) container_of(pf, X, file) |
1da177e4 LT |
94 | |
95 | #define PF_TO_PPP(pf) PF_TO_X(pf, struct ppp) | |
96 | #define PF_TO_CHANNEL(pf) PF_TO_X(pf, struct channel) | |
97 | ||
e51f6ff3 KG |
98 | /* |
99 | * Data structure to hold primary network stats for which | |
100 | * we want to use 64 bit storage. Other network stats | |
101 | * are stored in dev->stats of the ppp strucute. | |
102 | */ | |
103 | struct ppp_link_stats { | |
104 | u64 rx_packets; | |
105 | u64 tx_packets; | |
106 | u64 rx_bytes; | |
107 | u64 tx_bytes; | |
108 | }; | |
109 | ||
1da177e4 LT |
110 | /* |
111 | * Data structure describing one ppp unit. | |
112 | * A ppp unit corresponds to a ppp network interface device | |
113 | * and represents a multilink bundle. | |
114 | * It can have 0 or more ppp channels connected to it. | |
115 | */ | |
116 | struct ppp { | |
117 | struct ppp_file file; /* stuff for read/write/poll 0 */ | |
118 | struct file *owner; /* file that owns this unit 48 */ | |
119 | struct list_head channels; /* list of attached channels 4c */ | |
120 | int n_channels; /* how many channels are attached 54 */ | |
121 | spinlock_t rlock; /* lock for receive side 58 */ | |
122 | spinlock_t wlock; /* lock for transmit side 5c */ | |
e5dadc65 | 123 | int *xmit_recursion __percpu; /* xmit recursion detect */ |
1da177e4 LT |
124 | int mru; /* max receive unit 60 */ |
125 | unsigned int flags; /* control bits 64 */ | |
126 | unsigned int xstate; /* transmit state bits 68 */ | |
127 | unsigned int rstate; /* receive state bits 6c */ | |
128 | int debug; /* debug flags 70 */ | |
129 | struct slcompress *vj; /* state for VJ header compression */ | |
130 | enum NPmode npmode[NUM_NP]; /* what to do with each net proto 78 */ | |
131 | struct sk_buff *xmit_pending; /* a packet ready to go out 88 */ | |
132 | struct compressor *xcomp; /* transmit packet compressor 8c */ | |
133 | void *xc_state; /* its internal state 90 */ | |
134 | struct compressor *rcomp; /* receive decompressor 94 */ | |
135 | void *rc_state; /* its internal state 98 */ | |
136 | unsigned long last_xmit; /* jiffies when last pkt sent 9c */ | |
137 | unsigned long last_recv; /* jiffies when last pkt rcvd a0 */ | |
138 | struct net_device *dev; /* network interface device a4 */ | |
739840d5 | 139 | int closing; /* is device closing down? a8 */ |
1da177e4 LT |
140 | #ifdef CONFIG_PPP_MULTILINK |
141 | int nxchan; /* next channel to send something on */ | |
142 | u32 nxseq; /* next sequence number to send */ | |
143 | int mrru; /* MP: max reconst. receive unit */ | |
144 | u32 nextseq; /* MP: seq no of next packet */ | |
145 | u32 minseq; /* MP: min of most recent seqnos */ | |
146 | struct sk_buff_head mrq; /* MP: receive reconstruction queue */ | |
147 | #endif /* CONFIG_PPP_MULTILINK */ | |
1da177e4 | 148 | #ifdef CONFIG_PPP_FILTER |
7ae457c1 AS |
149 | struct bpf_prog *pass_filter; /* filter for packets to pass */ |
150 | struct bpf_prog *active_filter; /* filter for pkts to reset idle */ | |
1da177e4 | 151 | #endif /* CONFIG_PPP_FILTER */ |
273ec51d | 152 | struct net *ppp_net; /* the net we belong to */ |
e51f6ff3 | 153 | struct ppp_link_stats stats64; /* 64 bit network stats */ |
1da177e4 LT |
154 | }; |
155 | ||
156 | /* | |
157 | * Bits in flags: SC_NO_TCP_CCID, SC_CCP_OPEN, SC_CCP_UP, SC_LOOP_TRAFFIC, | |
b3f9b92a MD |
158 | * SC_MULTILINK, SC_MP_SHORTSEQ, SC_MP_XSHORTSEQ, SC_COMP_TCP, SC_REJ_COMP_TCP, |
159 | * SC_MUST_COMP | |
1da177e4 LT |
160 | * Bits in rstate: SC_DECOMP_RUN, SC_DC_ERROR, SC_DC_FERROR. |
161 | * Bits in xstate: SC_COMP_RUN | |
162 | */ | |
163 | #define SC_FLAG_BITS (SC_NO_TCP_CCID|SC_CCP_OPEN|SC_CCP_UP|SC_LOOP_TRAFFIC \ | |
164 | |SC_MULTILINK|SC_MP_SHORTSEQ|SC_MP_XSHORTSEQ \ | |
b3f9b92a | 165 | |SC_COMP_TCP|SC_REJ_COMP_TCP|SC_MUST_COMP) |
1da177e4 LT |
166 | |
167 | /* | |
168 | * Private data structure for each channel. | |
169 | * This includes the data structure used for multilink. | |
170 | */ | |
171 | struct channel { | |
172 | struct ppp_file file; /* stuff for read/write/poll */ | |
173 | struct list_head list; /* link in all/new_channels list */ | |
174 | struct ppp_channel *chan; /* public channel data structure */ | |
175 | struct rw_semaphore chan_sem; /* protects `chan' during chan ioctl */ | |
176 | spinlock_t downl; /* protects `chan', file.xq dequeue */ | |
177 | struct ppp *ppp; /* ppp unit we're connected to */ | |
273ec51d | 178 | struct net *chan_net; /* the net channel belongs to */ |
1da177e4 LT |
179 | struct list_head clist; /* link in list of channels per unit */ |
180 | rwlock_t upl; /* protects `ppp' */ | |
181 | #ifdef CONFIG_PPP_MULTILINK | |
182 | u8 avail; /* flag used in multilink stuff */ | |
183 | u8 had_frag; /* >= 1 fragments have been sent */ | |
184 | u32 lastseq; /* MP: last sequence # received */ | |
fa44a73c | 185 | int speed; /* speed of the corresponding ppp channel*/ |
1da177e4 LT |
186 | #endif /* CONFIG_PPP_MULTILINK */ |
187 | }; | |
188 | ||
7d9f0b48 GN |
189 | struct ppp_config { |
190 | struct file *file; | |
191 | s32 unit; | |
96d934c7 | 192 | bool ifname_is_set; |
7d9f0b48 GN |
193 | }; |
194 | ||
1da177e4 LT |
195 | /* |
196 | * SMP locking issues: | |
197 | * Both the ppp.rlock and ppp.wlock locks protect the ppp.channels | |
198 | * list and the ppp.n_channels field, you need to take both locks | |
199 | * before you modify them. | |
200 | * The lock ordering is: channel.upl -> ppp.wlock -> ppp.rlock -> | |
201 | * channel.downl. | |
202 | */ | |
203 | ||
15fd0cd9 | 204 | static DEFINE_MUTEX(ppp_mutex); |
1da177e4 | 205 | static atomic_t ppp_unit_count = ATOMIC_INIT(0); |
1da177e4 LT |
206 | static atomic_t channel_count = ATOMIC_INIT(0); |
207 | ||
273ec51d | 208 | /* per-net private data for this module */ |
c7d03a00 | 209 | static unsigned int ppp_net_id __read_mostly; |
273ec51d CG |
210 | struct ppp_net { |
211 | /* units to ppp mapping */ | |
212 | struct idr units_idr; | |
213 | ||
214 | /* | |
215 | * all_ppp_mutex protects the units_idr mapping. | |
216 | * It also ensures that finding a ppp unit in the units_idr | |
217 | * map and updating its file.refcnt field is atomic. | |
218 | */ | |
219 | struct mutex all_ppp_mutex; | |
220 | ||
221 | /* channels */ | |
222 | struct list_head all_channels; | |
223 | struct list_head new_channels; | |
224 | int last_channel_index; | |
225 | ||
226 | /* | |
227 | * all_channels_lock protects all_channels and | |
228 | * last_channel_index, and the atomicity of find | |
229 | * a channel and updating its file.refcnt field. | |
230 | */ | |
231 | spinlock_t all_channels_lock; | |
232 | }; | |
233 | ||
1da177e4 | 234 | /* Get the PPP protocol number from a skb */ |
96545aeb | 235 | #define PPP_PROTO(skb) get_unaligned_be16((skb)->data) |
1da177e4 LT |
236 | |
237 | /* We limit the length of ppp->file.rq to this (arbitrary) value */ | |
238 | #define PPP_MAX_RQLEN 32 | |
239 | ||
240 | /* | |
241 | * Maximum number of multilink fragments queued up. | |
242 | * This has to be large enough to cope with the maximum latency of | |
243 | * the slowest channel relative to the others. Strictly it should | |
244 | * depend on the number of channels and their characteristics. | |
245 | */ | |
246 | #define PPP_MP_MAX_QLEN 128 | |
247 | ||
248 | /* Multilink header bits. */ | |
249 | #define B 0x80 /* this fragment begins a packet */ | |
250 | #define E 0x40 /* this fragment ends a packet */ | |
251 | ||
252 | /* Compare multilink sequence numbers (assumed to be 32 bits wide) */ | |
253 | #define seq_before(a, b) ((s32)((a) - (b)) < 0) | |
254 | #define seq_after(a, b) ((s32)((a) - (b)) > 0) | |
255 | ||
256 | /* Prototypes. */ | |
273ec51d CG |
257 | static int ppp_unattached_ioctl(struct net *net, struct ppp_file *pf, |
258 | struct file *file, unsigned int cmd, unsigned long arg); | |
9a5d2bd9 | 259 | static void ppp_xmit_process(struct ppp *ppp); |
1da177e4 LT |
260 | static void ppp_send_frame(struct ppp *ppp, struct sk_buff *skb); |
261 | static void ppp_push(struct ppp *ppp); | |
262 | static void ppp_channel_push(struct channel *pch); | |
263 | static void ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, | |
264 | struct channel *pch); | |
265 | static void ppp_receive_error(struct ppp *ppp); | |
266 | static void ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb); | |
267 | static struct sk_buff *ppp_decompress_frame(struct ppp *ppp, | |
268 | struct sk_buff *skb); | |
269 | #ifdef CONFIG_PPP_MULTILINK | |
270 | static void ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, | |
271 | struct channel *pch); | |
272 | static void ppp_mp_insert(struct ppp *ppp, struct sk_buff *skb); | |
273 | static struct sk_buff *ppp_mp_reconstruct(struct ppp *ppp); | |
274 | static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb); | |
275 | #endif /* CONFIG_PPP_MULTILINK */ | |
276 | static int ppp_set_compress(struct ppp *ppp, unsigned long arg); | |
277 | static void ppp_ccp_peek(struct ppp *ppp, struct sk_buff *skb, int inbound); | |
278 | static void ppp_ccp_closed(struct ppp *ppp); | |
279 | static struct compressor *find_compressor(int type); | |
280 | static void ppp_get_stats(struct ppp *ppp, struct ppp_stats *st); | |
7d9f0b48 | 281 | static int ppp_create_interface(struct net *net, struct file *file, int *unit); |
1da177e4 | 282 | static void init_ppp_file(struct ppp_file *pf, int kind); |
1da177e4 | 283 | static void ppp_destroy_interface(struct ppp *ppp); |
273ec51d CG |
284 | static struct ppp *ppp_find_unit(struct ppp_net *pn, int unit); |
285 | static struct channel *ppp_find_channel(struct ppp_net *pn, int unit); | |
1da177e4 LT |
286 | static int ppp_connect_channel(struct channel *pch, int unit); |
287 | static int ppp_disconnect_channel(struct channel *pch); | |
288 | static void ppp_destroy_channel(struct channel *pch); | |
7a95d267 | 289 | static int unit_get(struct idr *p, void *ptr); |
85997576 | 290 | static int unit_set(struct idr *p, void *ptr, int n); |
7a95d267 CG |
291 | static void unit_put(struct idr *p, int n); |
292 | static void *unit_find(struct idr *p, int n); | |
96d934c7 | 293 | static void ppp_setup(struct net_device *dev); |
1da177e4 | 294 | |
79c441ae GN |
295 | static const struct net_device_ops ppp_netdev_ops; |
296 | ||
56b22935 | 297 | static struct class *ppp_class; |
1da177e4 | 298 | |
273ec51d CG |
299 | /* per net-namespace data */ |
300 | static inline struct ppp_net *ppp_pernet(struct net *net) | |
301 | { | |
302 | BUG_ON(!net); | |
303 | ||
304 | return net_generic(net, ppp_net_id); | |
305 | } | |
306 | ||
1da177e4 LT |
307 | /* Translates a PPP protocol number to a NP index (NP == network protocol) */ |
308 | static inline int proto_to_npindex(int proto) | |
309 | { | |
310 | switch (proto) { | |
311 | case PPP_IP: | |
312 | return NP_IP; | |
313 | case PPP_IPV6: | |
314 | return NP_IPV6; | |
315 | case PPP_IPX: | |
316 | return NP_IPX; | |
317 | case PPP_AT: | |
318 | return NP_AT; | |
319 | case PPP_MPLS_UC: | |
320 | return NP_MPLS_UC; | |
321 | case PPP_MPLS_MC: | |
322 | return NP_MPLS_MC; | |
323 | } | |
324 | return -EINVAL; | |
325 | } | |
326 | ||
327 | /* Translates an NP index into a PPP protocol number */ | |
328 | static const int npindex_to_proto[NUM_NP] = { | |
329 | PPP_IP, | |
330 | PPP_IPV6, | |
331 | PPP_IPX, | |
332 | PPP_AT, | |
333 | PPP_MPLS_UC, | |
334 | PPP_MPLS_MC, | |
335 | }; | |
6aa20a22 | 336 | |
1da177e4 LT |
337 | /* Translates an ethertype into an NP index */ |
338 | static inline int ethertype_to_npindex(int ethertype) | |
339 | { | |
340 | switch (ethertype) { | |
341 | case ETH_P_IP: | |
342 | return NP_IP; | |
343 | case ETH_P_IPV6: | |
344 | return NP_IPV6; | |
345 | case ETH_P_IPX: | |
346 | return NP_IPX; | |
347 | case ETH_P_PPPTALK: | |
348 | case ETH_P_ATALK: | |
349 | return NP_AT; | |
350 | case ETH_P_MPLS_UC: | |
351 | return NP_MPLS_UC; | |
352 | case ETH_P_MPLS_MC: | |
353 | return NP_MPLS_MC; | |
354 | } | |
355 | return -1; | |
356 | } | |
357 | ||
358 | /* Translates an NP index into an ethertype */ | |
359 | static const int npindex_to_ethertype[NUM_NP] = { | |
360 | ETH_P_IP, | |
361 | ETH_P_IPV6, | |
362 | ETH_P_IPX, | |
363 | ETH_P_PPPTALK, | |
364 | ETH_P_MPLS_UC, | |
365 | ETH_P_MPLS_MC, | |
366 | }; | |
367 | ||
368 | /* | |
369 | * Locking shorthand. | |
370 | */ | |
371 | #define ppp_xmit_lock(ppp) spin_lock_bh(&(ppp)->wlock) | |
372 | #define ppp_xmit_unlock(ppp) spin_unlock_bh(&(ppp)->wlock) | |
373 | #define ppp_recv_lock(ppp) spin_lock_bh(&(ppp)->rlock) | |
374 | #define ppp_recv_unlock(ppp) spin_unlock_bh(&(ppp)->rlock) | |
375 | #define ppp_lock(ppp) do { ppp_xmit_lock(ppp); \ | |
376 | ppp_recv_lock(ppp); } while (0) | |
377 | #define ppp_unlock(ppp) do { ppp_recv_unlock(ppp); \ | |
378 | ppp_xmit_unlock(ppp); } while (0) | |
379 | ||
380 | /* | |
381 | * /dev/ppp device routines. | |
382 | * The /dev/ppp device is used by pppd to control the ppp unit. | |
383 | * It supports the read, write, ioctl and poll functions. | |
384 | * Open instances of /dev/ppp can be in one of three states: | |
385 | * unattached, attached to a ppp unit, or attached to a ppp channel. | |
386 | */ | |
387 | static int ppp_open(struct inode *inode, struct file *file) | |
388 | { | |
389 | /* | |
390 | * This could (should?) be enforced by the permissions on /dev/ppp. | |
391 | */ | |
392 | if (!capable(CAP_NET_ADMIN)) | |
393 | return -EPERM; | |
394 | return 0; | |
395 | } | |
396 | ||
f3ff8a4d | 397 | static int ppp_release(struct inode *unused, struct file *file) |
1da177e4 LT |
398 | { |
399 | struct ppp_file *pf = file->private_data; | |
400 | struct ppp *ppp; | |
401 | ||
cd228d54 | 402 | if (pf) { |
1da177e4 LT |
403 | file->private_data = NULL; |
404 | if (pf->kind == INTERFACE) { | |
405 | ppp = PF_TO_PPP(pf); | |
8cb775bc | 406 | rtnl_lock(); |
1da177e4 | 407 | if (file == ppp->owner) |
8cb775bc GN |
408 | unregister_netdevice(ppp->dev); |
409 | rtnl_unlock(); | |
1da177e4 LT |
410 | } |
411 | if (atomic_dec_and_test(&pf->refcnt)) { | |
412 | switch (pf->kind) { | |
413 | case INTERFACE: | |
414 | ppp_destroy_interface(PF_TO_PPP(pf)); | |
415 | break; | |
416 | case CHANNEL: | |
417 | ppp_destroy_channel(PF_TO_CHANNEL(pf)); | |
418 | break; | |
419 | } | |
420 | } | |
421 | } | |
422 | return 0; | |
423 | } | |
424 | ||
425 | static ssize_t ppp_read(struct file *file, char __user *buf, | |
426 | size_t count, loff_t *ppos) | |
427 | { | |
428 | struct ppp_file *pf = file->private_data; | |
429 | DECLARE_WAITQUEUE(wait, current); | |
430 | ssize_t ret; | |
431 | struct sk_buff *skb = NULL; | |
19937d04 | 432 | struct iovec iov; |
ba568408 | 433 | struct iov_iter to; |
1da177e4 LT |
434 | |
435 | ret = count; | |
436 | ||
cd228d54 | 437 | if (!pf) |
1da177e4 LT |
438 | return -ENXIO; |
439 | add_wait_queue(&pf->rwait, &wait); | |
440 | for (;;) { | |
441 | set_current_state(TASK_INTERRUPTIBLE); | |
442 | skb = skb_dequeue(&pf->rq); | |
443 | if (skb) | |
444 | break; | |
445 | ret = 0; | |
446 | if (pf->dead) | |
447 | break; | |
448 | if (pf->kind == INTERFACE) { | |
449 | /* | |
450 | * Return 0 (EOF) on an interface that has no | |
451 | * channels connected, unless it is looping | |
452 | * network traffic (demand mode). | |
453 | */ | |
454 | struct ppp *ppp = PF_TO_PPP(pf); | |
edffc217 GN |
455 | |
456 | ppp_recv_lock(ppp); | |
8e95a202 | 457 | if (ppp->n_channels == 0 && |
edffc217 GN |
458 | (ppp->flags & SC_LOOP_TRAFFIC) == 0) { |
459 | ppp_recv_unlock(ppp); | |
1da177e4 | 460 | break; |
edffc217 GN |
461 | } |
462 | ppp_recv_unlock(ppp); | |
1da177e4 LT |
463 | } |
464 | ret = -EAGAIN; | |
465 | if (file->f_flags & O_NONBLOCK) | |
466 | break; | |
467 | ret = -ERESTARTSYS; | |
468 | if (signal_pending(current)) | |
469 | break; | |
470 | schedule(); | |
471 | } | |
472 | set_current_state(TASK_RUNNING); | |
473 | remove_wait_queue(&pf->rwait, &wait); | |
474 | ||
cd228d54 | 475 | if (!skb) |
1da177e4 LT |
476 | goto out; |
477 | ||
478 | ret = -EOVERFLOW; | |
479 | if (skb->len > count) | |
480 | goto outf; | |
481 | ret = -EFAULT; | |
19937d04 SA |
482 | iov.iov_base = buf; |
483 | iov.iov_len = count; | |
ba568408 AV |
484 | iov_iter_init(&to, READ, &iov, 1, count); |
485 | if (skb_copy_datagram_iter(skb, 0, &to, skb->len)) | |
1da177e4 LT |
486 | goto outf; |
487 | ret = skb->len; | |
488 | ||
489 | outf: | |
490 | kfree_skb(skb); | |
491 | out: | |
492 | return ret; | |
493 | } | |
494 | ||
495 | static ssize_t ppp_write(struct file *file, const char __user *buf, | |
496 | size_t count, loff_t *ppos) | |
497 | { | |
498 | struct ppp_file *pf = file->private_data; | |
499 | struct sk_buff *skb; | |
500 | ssize_t ret; | |
501 | ||
cd228d54 | 502 | if (!pf) |
1da177e4 LT |
503 | return -ENXIO; |
504 | ret = -ENOMEM; | |
505 | skb = alloc_skb(count + pf->hdrlen, GFP_KERNEL); | |
cd228d54 | 506 | if (!skb) |
1da177e4 LT |
507 | goto out; |
508 | skb_reserve(skb, pf->hdrlen); | |
509 | ret = -EFAULT; | |
510 | if (copy_from_user(skb_put(skb, count), buf, count)) { | |
511 | kfree_skb(skb); | |
512 | goto out; | |
513 | } | |
514 | ||
515 | skb_queue_tail(&pf->xq, skb); | |
516 | ||
517 | switch (pf->kind) { | |
518 | case INTERFACE: | |
519 | ppp_xmit_process(PF_TO_PPP(pf)); | |
520 | break; | |
521 | case CHANNEL: | |
522 | ppp_channel_push(PF_TO_CHANNEL(pf)); | |
523 | break; | |
524 | } | |
525 | ||
526 | ret = count; | |
527 | ||
528 | out: | |
529 | return ret; | |
530 | } | |
531 | ||
532 | /* No kernel lock - fine */ | |
533 | static unsigned int ppp_poll(struct file *file, poll_table *wait) | |
534 | { | |
535 | struct ppp_file *pf = file->private_data; | |
536 | unsigned int mask; | |
537 | ||
cd228d54 | 538 | if (!pf) |
1da177e4 LT |
539 | return 0; |
540 | poll_wait(file, &pf->rwait, wait); | |
541 | mask = POLLOUT | POLLWRNORM; | |
cd228d54 | 542 | if (skb_peek(&pf->rq)) |
1da177e4 LT |
543 | mask |= POLLIN | POLLRDNORM; |
544 | if (pf->dead) | |
545 | mask |= POLLHUP; | |
546 | else if (pf->kind == INTERFACE) { | |
547 | /* see comment in ppp_read */ | |
548 | struct ppp *ppp = PF_TO_PPP(pf); | |
edffc217 GN |
549 | |
550 | ppp_recv_lock(ppp); | |
8e95a202 JP |
551 | if (ppp->n_channels == 0 && |
552 | (ppp->flags & SC_LOOP_TRAFFIC) == 0) | |
1da177e4 | 553 | mask |= POLLIN | POLLRDNORM; |
edffc217 | 554 | ppp_recv_unlock(ppp); |
1da177e4 LT |
555 | } |
556 | ||
557 | return mask; | |
558 | } | |
559 | ||
560 | #ifdef CONFIG_PPP_FILTER | |
561 | static int get_filter(void __user *arg, struct sock_filter **p) | |
562 | { | |
563 | struct sock_fprog uprog; | |
564 | struct sock_filter *code = NULL; | |
3916a319 | 565 | int len; |
1da177e4 LT |
566 | |
567 | if (copy_from_user(&uprog, arg, sizeof(uprog))) | |
568 | return -EFAULT; | |
569 | ||
1da177e4 LT |
570 | if (!uprog.len) { |
571 | *p = NULL; | |
572 | return 0; | |
573 | } | |
574 | ||
575 | len = uprog.len * sizeof(struct sock_filter); | |
b23d00e9 JL |
576 | code = memdup_user(uprog.filter, len); |
577 | if (IS_ERR(code)) | |
578 | return PTR_ERR(code); | |
1da177e4 | 579 | |
1da177e4 LT |
580 | *p = code; |
581 | return uprog.len; | |
582 | } | |
583 | #endif /* CONFIG_PPP_FILTER */ | |
584 | ||
f3ff8a4d | 585 | static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 | 586 | { |
e8e56ffd | 587 | struct ppp_file *pf; |
1da177e4 LT |
588 | struct ppp *ppp; |
589 | int err = -EFAULT, val, val2, i; | |
590 | struct ppp_idle idle; | |
591 | struct npioctl npi; | |
592 | int unit, cflags; | |
593 | struct slcompress *vj; | |
594 | void __user *argp = (void __user *)arg; | |
595 | int __user *p = argp; | |
596 | ||
e8e56ffd GN |
597 | mutex_lock(&ppp_mutex); |
598 | ||
599 | pf = file->private_data; | |
600 | if (!pf) { | |
601 | err = ppp_unattached_ioctl(current->nsproxy->net_ns, | |
602 | pf, file, cmd, arg); | |
603 | goto out; | |
604 | } | |
1da177e4 LT |
605 | |
606 | if (cmd == PPPIOCDETACH) { | |
607 | /* | |
608 | * We have to be careful here... if the file descriptor | |
609 | * has been dup'd, we could have another process in the | |
610 | * middle of a poll using the same file *, so we had | |
611 | * better not free the interface data structures - | |
612 | * instead we fail the ioctl. Even in this case, we | |
613 | * shut down the interface if we are the owner of it. | |
614 | * Actually, we should get rid of PPPIOCDETACH, userland | |
615 | * (i.e. pppd) could achieve the same effect by closing | |
616 | * this fd and reopening /dev/ppp. | |
617 | */ | |
618 | err = -EINVAL; | |
619 | if (pf->kind == INTERFACE) { | |
620 | ppp = PF_TO_PPP(pf); | |
8cb775bc | 621 | rtnl_lock(); |
1da177e4 | 622 | if (file == ppp->owner) |
8cb775bc GN |
623 | unregister_netdevice(ppp->dev); |
624 | rtnl_unlock(); | |
1da177e4 | 625 | } |
24dff96a | 626 | if (atomic_long_read(&file->f_count) < 2) { |
f3ff8a4d | 627 | ppp_release(NULL, file); |
1da177e4 LT |
628 | err = 0; |
629 | } else | |
b48f8c23 DM |
630 | pr_warn("PPPIOCDETACH file->f_count=%ld\n", |
631 | atomic_long_read(&file->f_count)); | |
e8e56ffd | 632 | goto out; |
1da177e4 LT |
633 | } |
634 | ||
635 | if (pf->kind == CHANNEL) { | |
f3ff8a4d | 636 | struct channel *pch; |
1da177e4 LT |
637 | struct ppp_channel *chan; |
638 | ||
f3ff8a4d AC |
639 | pch = PF_TO_CHANNEL(pf); |
640 | ||
1da177e4 LT |
641 | switch (cmd) { |
642 | case PPPIOCCONNECT: | |
643 | if (get_user(unit, p)) | |
644 | break; | |
645 | err = ppp_connect_channel(pch, unit); | |
646 | break; | |
647 | ||
648 | case PPPIOCDISCONN: | |
649 | err = ppp_disconnect_channel(pch); | |
650 | break; | |
651 | ||
652 | default: | |
653 | down_read(&pch->chan_sem); | |
654 | chan = pch->chan; | |
655 | err = -ENOTTY; | |
656 | if (chan && chan->ops->ioctl) | |
657 | err = chan->ops->ioctl(chan, cmd, arg); | |
658 | up_read(&pch->chan_sem); | |
659 | } | |
e8e56ffd | 660 | goto out; |
1da177e4 LT |
661 | } |
662 | ||
663 | if (pf->kind != INTERFACE) { | |
664 | /* can't happen */ | |
b48f8c23 | 665 | pr_err("PPP: not interface or channel??\n"); |
e8e56ffd GN |
666 | err = -EINVAL; |
667 | goto out; | |
1da177e4 LT |
668 | } |
669 | ||
670 | ppp = PF_TO_PPP(pf); | |
671 | switch (cmd) { | |
672 | case PPPIOCSMRU: | |
673 | if (get_user(val, p)) | |
674 | break; | |
675 | ppp->mru = val; | |
676 | err = 0; | |
677 | break; | |
678 | ||
679 | case PPPIOCSFLAGS: | |
680 | if (get_user(val, p)) | |
681 | break; | |
682 | ppp_lock(ppp); | |
683 | cflags = ppp->flags & ~val; | |
a9f559c3 | 684 | #ifdef CONFIG_PPP_MULTILINK |
d762d038 CS |
685 | if (!(ppp->flags & SC_MULTILINK) && (val & SC_MULTILINK)) |
686 | ppp->nextseq = 0; | |
a9f559c3 | 687 | #endif |
1da177e4 LT |
688 | ppp->flags = val & SC_FLAG_BITS; |
689 | ppp_unlock(ppp); | |
690 | if (cflags & SC_CCP_OPEN) | |
691 | ppp_ccp_closed(ppp); | |
692 | err = 0; | |
693 | break; | |
694 | ||
695 | case PPPIOCGFLAGS: | |
696 | val = ppp->flags | ppp->xstate | ppp->rstate; | |
697 | if (put_user(val, p)) | |
698 | break; | |
699 | err = 0; | |
700 | break; | |
701 | ||
702 | case PPPIOCSCOMPRESS: | |
703 | err = ppp_set_compress(ppp, arg); | |
704 | break; | |
705 | ||
706 | case PPPIOCGUNIT: | |
707 | if (put_user(ppp->file.index, p)) | |
708 | break; | |
709 | err = 0; | |
710 | break; | |
711 | ||
712 | case PPPIOCSDEBUG: | |
713 | if (get_user(val, p)) | |
714 | break; | |
715 | ppp->debug = val; | |
716 | err = 0; | |
717 | break; | |
718 | ||
719 | case PPPIOCGDEBUG: | |
720 | if (put_user(ppp->debug, p)) | |
721 | break; | |
722 | err = 0; | |
723 | break; | |
724 | ||
725 | case PPPIOCGIDLE: | |
726 | idle.xmit_idle = (jiffies - ppp->last_xmit) / HZ; | |
727 | idle.recv_idle = (jiffies - ppp->last_recv) / HZ; | |
728 | if (copy_to_user(argp, &idle, sizeof(idle))) | |
729 | break; | |
730 | err = 0; | |
731 | break; | |
732 | ||
733 | case PPPIOCSMAXCID: | |
734 | if (get_user(val, p)) | |
735 | break; | |
736 | val2 = 15; | |
737 | if ((val >> 16) != 0) { | |
738 | val2 = val >> 16; | |
739 | val &= 0xffff; | |
740 | } | |
741 | vj = slhc_init(val2+1, val+1); | |
4ab42d78 BH |
742 | if (IS_ERR(vj)) { |
743 | err = PTR_ERR(vj); | |
1da177e4 LT |
744 | break; |
745 | } | |
746 | ppp_lock(ppp); | |
cd228d54 | 747 | if (ppp->vj) |
1da177e4 LT |
748 | slhc_free(ppp->vj); |
749 | ppp->vj = vj; | |
750 | ppp_unlock(ppp); | |
751 | err = 0; | |
752 | break; | |
753 | ||
754 | case PPPIOCGNPMODE: | |
755 | case PPPIOCSNPMODE: | |
756 | if (copy_from_user(&npi, argp, sizeof(npi))) | |
757 | break; | |
758 | err = proto_to_npindex(npi.protocol); | |
759 | if (err < 0) | |
760 | break; | |
761 | i = err; | |
762 | if (cmd == PPPIOCGNPMODE) { | |
763 | err = -EFAULT; | |
764 | npi.mode = ppp->npmode[i]; | |
765 | if (copy_to_user(argp, &npi, sizeof(npi))) | |
766 | break; | |
767 | } else { | |
768 | ppp->npmode[i] = npi.mode; | |
769 | /* we may be able to transmit more packets now (??) */ | |
770 | netif_wake_queue(ppp->dev); | |
771 | } | |
772 | err = 0; | |
773 | break; | |
774 | ||
775 | #ifdef CONFIG_PPP_FILTER | |
776 | case PPPIOCSPASS: | |
777 | { | |
778 | struct sock_filter *code; | |
568f194e | 779 | |
1da177e4 LT |
780 | err = get_filter(argp, &code); |
781 | if (err >= 0) { | |
5748eb8f | 782 | struct bpf_prog *pass_filter = NULL; |
b1fcd35c | 783 | struct sock_fprog_kern fprog = { |
568f194e DB |
784 | .len = err, |
785 | .filter = code, | |
786 | }; | |
787 | ||
5748eb8f TI |
788 | err = 0; |
789 | if (fprog.filter) | |
790 | err = bpf_prog_create(&pass_filter, &fprog); | |
791 | if (!err) { | |
792 | ppp_lock(ppp); | |
793 | if (ppp->pass_filter) | |
794 | bpf_prog_destroy(ppp->pass_filter); | |
795 | ppp->pass_filter = pass_filter; | |
796 | ppp_unlock(ppp); | |
cc25eaae | 797 | } |
568f194e | 798 | kfree(code); |
1da177e4 LT |
799 | } |
800 | break; | |
801 | } | |
802 | case PPPIOCSACTIVE: | |
803 | { | |
804 | struct sock_filter *code; | |
568f194e | 805 | |
1da177e4 LT |
806 | err = get_filter(argp, &code); |
807 | if (err >= 0) { | |
5748eb8f | 808 | struct bpf_prog *active_filter = NULL; |
b1fcd35c | 809 | struct sock_fprog_kern fprog = { |
568f194e DB |
810 | .len = err, |
811 | .filter = code, | |
812 | }; | |
813 | ||
5748eb8f TI |
814 | err = 0; |
815 | if (fprog.filter) | |
816 | err = bpf_prog_create(&active_filter, &fprog); | |
817 | if (!err) { | |
818 | ppp_lock(ppp); | |
819 | if (ppp->active_filter) | |
820 | bpf_prog_destroy(ppp->active_filter); | |
821 | ppp->active_filter = active_filter; | |
822 | ppp_unlock(ppp); | |
cc25eaae | 823 | } |
568f194e | 824 | kfree(code); |
1da177e4 LT |
825 | } |
826 | break; | |
827 | } | |
828 | #endif /* CONFIG_PPP_FILTER */ | |
829 | ||
830 | #ifdef CONFIG_PPP_MULTILINK | |
831 | case PPPIOCSMRRU: | |
832 | if (get_user(val, p)) | |
833 | break; | |
834 | ppp_recv_lock(ppp); | |
835 | ppp->mrru = val; | |
836 | ppp_recv_unlock(ppp); | |
837 | err = 0; | |
838 | break; | |
839 | #endif /* CONFIG_PPP_MULTILINK */ | |
840 | ||
841 | default: | |
842 | err = -ENOTTY; | |
843 | } | |
e8e56ffd GN |
844 | |
845 | out: | |
15fd0cd9 | 846 | mutex_unlock(&ppp_mutex); |
e8e56ffd | 847 | |
1da177e4 LT |
848 | return err; |
849 | } | |
850 | ||
273ec51d CG |
851 | static int ppp_unattached_ioctl(struct net *net, struct ppp_file *pf, |
852 | struct file *file, unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
853 | { |
854 | int unit, err = -EFAULT; | |
855 | struct ppp *ppp; | |
856 | struct channel *chan; | |
273ec51d | 857 | struct ppp_net *pn; |
1da177e4 LT |
858 | int __user *p = (int __user *)arg; |
859 | ||
860 | switch (cmd) { | |
861 | case PPPIOCNEWUNIT: | |
862 | /* Create a new ppp unit */ | |
863 | if (get_user(unit, p)) | |
864 | break; | |
7d9f0b48 GN |
865 | err = ppp_create_interface(net, file, &unit); |
866 | if (err < 0) | |
1da177e4 | 867 | break; |
7d9f0b48 | 868 | |
1da177e4 | 869 | err = -EFAULT; |
7d9f0b48 | 870 | if (put_user(unit, p)) |
1da177e4 LT |
871 | break; |
872 | err = 0; | |
873 | break; | |
874 | ||
875 | case PPPIOCATTACH: | |
876 | /* Attach to an existing ppp unit */ | |
877 | if (get_user(unit, p)) | |
878 | break; | |
1da177e4 | 879 | err = -ENXIO; |
273ec51d CG |
880 | pn = ppp_pernet(net); |
881 | mutex_lock(&pn->all_ppp_mutex); | |
882 | ppp = ppp_find_unit(pn, unit); | |
cd228d54 | 883 | if (ppp) { |
1da177e4 LT |
884 | atomic_inc(&ppp->file.refcnt); |
885 | file->private_data = &ppp->file; | |
886 | err = 0; | |
887 | } | |
273ec51d | 888 | mutex_unlock(&pn->all_ppp_mutex); |
1da177e4 LT |
889 | break; |
890 | ||
891 | case PPPIOCATTCHAN: | |
892 | if (get_user(unit, p)) | |
893 | break; | |
1da177e4 | 894 | err = -ENXIO; |
273ec51d CG |
895 | pn = ppp_pernet(net); |
896 | spin_lock_bh(&pn->all_channels_lock); | |
897 | chan = ppp_find_channel(pn, unit); | |
cd228d54 | 898 | if (chan) { |
1da177e4 LT |
899 | atomic_inc(&chan->file.refcnt); |
900 | file->private_data = &chan->file; | |
901 | err = 0; | |
902 | } | |
273ec51d | 903 | spin_unlock_bh(&pn->all_channels_lock); |
1da177e4 LT |
904 | break; |
905 | ||
906 | default: | |
907 | err = -ENOTTY; | |
908 | } | |
e8e56ffd | 909 | |
1da177e4 LT |
910 | return err; |
911 | } | |
912 | ||
d54b1fdb | 913 | static const struct file_operations ppp_device_fops = { |
1da177e4 LT |
914 | .owner = THIS_MODULE, |
915 | .read = ppp_read, | |
916 | .write = ppp_write, | |
917 | .poll = ppp_poll, | |
f3ff8a4d | 918 | .unlocked_ioctl = ppp_ioctl, |
1da177e4 | 919 | .open = ppp_open, |
6038f373 AB |
920 | .release = ppp_release, |
921 | .llseek = noop_llseek, | |
1da177e4 LT |
922 | }; |
923 | ||
273ec51d CG |
924 | static __net_init int ppp_init_net(struct net *net) |
925 | { | |
741a6fa2 | 926 | struct ppp_net *pn = net_generic(net, ppp_net_id); |
273ec51d CG |
927 | |
928 | idr_init(&pn->units_idr); | |
929 | mutex_init(&pn->all_ppp_mutex); | |
930 | ||
931 | INIT_LIST_HEAD(&pn->all_channels); | |
932 | INIT_LIST_HEAD(&pn->new_channels); | |
933 | ||
934 | spin_lock_init(&pn->all_channels_lock); | |
935 | ||
273ec51d CG |
936 | return 0; |
937 | } | |
938 | ||
939 | static __net_exit void ppp_exit_net(struct net *net) | |
940 | { | |
741a6fa2 | 941 | struct ppp_net *pn = net_generic(net, ppp_net_id); |
79c441ae GN |
942 | struct net_device *dev; |
943 | struct net_device *aux; | |
8cb775bc GN |
944 | struct ppp *ppp; |
945 | LIST_HEAD(list); | |
946 | int id; | |
947 | ||
948 | rtnl_lock(); | |
79c441ae GN |
949 | for_each_netdev_safe(net, dev, aux) { |
950 | if (dev->netdev_ops == &ppp_netdev_ops) | |
951 | unregister_netdevice_queue(dev, &list); | |
952 | } | |
953 | ||
8cb775bc | 954 | idr_for_each_entry(&pn->units_idr, ppp, id) |
79c441ae GN |
955 | /* Skip devices already unregistered by previous loop */ |
956 | if (!net_eq(dev_net(ppp->dev), net)) | |
957 | unregister_netdevice_queue(ppp->dev, &list); | |
8cb775bc GN |
958 | |
959 | unregister_netdevice_many(&list); | |
960 | rtnl_unlock(); | |
273ec51d | 961 | |
273ec51d | 962 | idr_destroy(&pn->units_idr); |
273ec51d CG |
963 | } |
964 | ||
0012985d | 965 | static struct pernet_operations ppp_net_ops = { |
273ec51d CG |
966 | .init = ppp_init_net, |
967 | .exit = ppp_exit_net, | |
741a6fa2 EB |
968 | .id = &ppp_net_id, |
969 | .size = sizeof(struct ppp_net), | |
273ec51d CG |
970 | }; |
971 | ||
96d934c7 | 972 | static int ppp_unit_register(struct ppp *ppp, int unit, bool ifname_is_set) |
7d9f0b48 GN |
973 | { |
974 | struct ppp_net *pn = ppp_pernet(ppp->ppp_net); | |
975 | int ret; | |
976 | ||
977 | mutex_lock(&pn->all_ppp_mutex); | |
978 | ||
979 | if (unit < 0) { | |
980 | ret = unit_get(&pn->units_idr, ppp); | |
981 | if (ret < 0) | |
982 | goto err; | |
983 | } else { | |
984 | /* Caller asked for a specific unit number. Fail with -EEXIST | |
985 | * if unavailable. For backward compatibility, return -EEXIST | |
986 | * too if idr allocation fails; this makes pppd retry without | |
987 | * requesting a specific unit number. | |
988 | */ | |
989 | if (unit_find(&pn->units_idr, unit)) { | |
990 | ret = -EEXIST; | |
991 | goto err; | |
992 | } | |
993 | ret = unit_set(&pn->units_idr, ppp, unit); | |
994 | if (ret < 0) { | |
995 | /* Rewrite error for backward compatibility */ | |
996 | ret = -EEXIST; | |
997 | goto err; | |
998 | } | |
999 | } | |
1000 | ppp->file.index = ret; | |
1001 | ||
96d934c7 GN |
1002 | if (!ifname_is_set) |
1003 | snprintf(ppp->dev->name, IFNAMSIZ, "ppp%i", ppp->file.index); | |
7d9f0b48 GN |
1004 | |
1005 | ret = register_netdevice(ppp->dev); | |
1006 | if (ret < 0) | |
1007 | goto err_unit; | |
1008 | ||
1009 | atomic_inc(&ppp_unit_count); | |
1010 | ||
1011 | mutex_unlock(&pn->all_ppp_mutex); | |
1012 | ||
1013 | return 0; | |
1014 | ||
1015 | err_unit: | |
1016 | unit_put(&pn->units_idr, ppp->file.index); | |
1017 | err: | |
1018 | mutex_unlock(&pn->all_ppp_mutex); | |
1019 | ||
1020 | return ret; | |
1021 | } | |
1022 | ||
1023 | static int ppp_dev_configure(struct net *src_net, struct net_device *dev, | |
1024 | const struct ppp_config *conf) | |
1025 | { | |
1026 | struct ppp *ppp = netdev_priv(dev); | |
1027 | int indx; | |
1028 | int err; | |
e5dadc65 | 1029 | int cpu; |
7d9f0b48 GN |
1030 | |
1031 | ppp->dev = dev; | |
1032 | ppp->ppp_net = src_net; | |
1033 | ppp->mru = PPP_MRU; | |
1034 | ppp->owner = conf->file; | |
1035 | ||
1036 | init_ppp_file(&ppp->file, INTERFACE); | |
1037 | ppp->file.hdrlen = PPP_HDRLEN - 2; /* don't count proto bytes */ | |
1038 | ||
1039 | for (indx = 0; indx < NUM_NP; ++indx) | |
1040 | ppp->npmode[indx] = NPMODE_PASS; | |
1041 | INIT_LIST_HEAD(&ppp->channels); | |
1042 | spin_lock_init(&ppp->rlock); | |
1043 | spin_lock_init(&ppp->wlock); | |
e5dadc65 GF |
1044 | |
1045 | ppp->xmit_recursion = alloc_percpu(int); | |
1046 | if (!ppp->xmit_recursion) { | |
1047 | err = -ENOMEM; | |
1048 | goto err1; | |
1049 | } | |
1050 | for_each_possible_cpu(cpu) | |
1051 | (*per_cpu_ptr(ppp->xmit_recursion, cpu)) = 0; | |
1052 | ||
7d9f0b48 GN |
1053 | #ifdef CONFIG_PPP_MULTILINK |
1054 | ppp->minseq = -1; | |
1055 | skb_queue_head_init(&ppp->mrq); | |
1056 | #endif /* CONFIG_PPP_MULTILINK */ | |
1057 | #ifdef CONFIG_PPP_FILTER | |
1058 | ppp->pass_filter = NULL; | |
1059 | ppp->active_filter = NULL; | |
1060 | #endif /* CONFIG_PPP_FILTER */ | |
1061 | ||
96d934c7 | 1062 | err = ppp_unit_register(ppp, conf->unit, conf->ifname_is_set); |
7d9f0b48 | 1063 | if (err < 0) |
e5dadc65 | 1064 | goto err2; |
7d9f0b48 GN |
1065 | |
1066 | conf->file->private_data = &ppp->file; | |
1067 | ||
1068 | return 0; | |
e5dadc65 GF |
1069 | err2: |
1070 | free_percpu(ppp->xmit_recursion); | |
1071 | err1: | |
1072 | return err; | |
7d9f0b48 GN |
1073 | } |
1074 | ||
96d934c7 GN |
1075 | static const struct nla_policy ppp_nl_policy[IFLA_PPP_MAX + 1] = { |
1076 | [IFLA_PPP_DEV_FD] = { .type = NLA_S32 }, | |
1077 | }; | |
1078 | ||
a8b8a889 MS |
1079 | static int ppp_nl_validate(struct nlattr *tb[], struct nlattr *data[], |
1080 | struct netlink_ext_ack *extack) | |
96d934c7 GN |
1081 | { |
1082 | if (!data) | |
1083 | return -EINVAL; | |
1084 | ||
1085 | if (!data[IFLA_PPP_DEV_FD]) | |
1086 | return -EINVAL; | |
1087 | if (nla_get_s32(data[IFLA_PPP_DEV_FD]) < 0) | |
1088 | return -EBADF; | |
1089 | ||
1090 | return 0; | |
1091 | } | |
1092 | ||
1093 | static int ppp_nl_newlink(struct net *src_net, struct net_device *dev, | |
7a3f4a18 MS |
1094 | struct nlattr *tb[], struct nlattr *data[], |
1095 | struct netlink_ext_ack *extack) | |
96d934c7 GN |
1096 | { |
1097 | struct ppp_config conf = { | |
1098 | .unit = -1, | |
1099 | .ifname_is_set = true, | |
1100 | }; | |
1101 | struct file *file; | |
1102 | int err; | |
1103 | ||
1104 | file = fget(nla_get_s32(data[IFLA_PPP_DEV_FD])); | |
1105 | if (!file) | |
1106 | return -EBADF; | |
1107 | ||
1108 | /* rtnl_lock is already held here, but ppp_create_interface() locks | |
1109 | * ppp_mutex before holding rtnl_lock. Using mutex_trylock() avoids | |
1110 | * possible deadlock due to lock order inversion, at the cost of | |
1111 | * pushing the problem back to userspace. | |
1112 | */ | |
1113 | if (!mutex_trylock(&ppp_mutex)) { | |
1114 | err = -EBUSY; | |
1115 | goto out; | |
1116 | } | |
1117 | ||
1118 | if (file->f_op != &ppp_device_fops || file->private_data) { | |
1119 | err = -EBADF; | |
1120 | goto out_unlock; | |
1121 | } | |
1122 | ||
1123 | conf.file = file; | |
bb8082f6 GN |
1124 | |
1125 | /* Don't use device name generated by the rtnetlink layer when ifname | |
1126 | * isn't specified. Let ppp_dev_configure() set the device name using | |
1127 | * the PPP unit identifer as suffix (i.e. ppp<unit_id>). This allows | |
1128 | * userspace to infer the device name using to the PPPIOCGUNIT ioctl. | |
1129 | */ | |
1130 | if (!tb[IFLA_IFNAME]) | |
1131 | conf.ifname_is_set = false; | |
1132 | ||
96d934c7 GN |
1133 | err = ppp_dev_configure(src_net, dev, &conf); |
1134 | ||
1135 | out_unlock: | |
1136 | mutex_unlock(&ppp_mutex); | |
1137 | out: | |
1138 | fput(file); | |
1139 | ||
1140 | return err; | |
1141 | } | |
1142 | ||
1143 | static void ppp_nl_dellink(struct net_device *dev, struct list_head *head) | |
1144 | { | |
1145 | unregister_netdevice_queue(dev, head); | |
1146 | } | |
1147 | ||
1148 | static size_t ppp_nl_get_size(const struct net_device *dev) | |
1149 | { | |
1150 | return 0; | |
1151 | } | |
1152 | ||
1153 | static int ppp_nl_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1154 | { | |
1155 | return 0; | |
1156 | } | |
1157 | ||
1158 | static struct net *ppp_nl_get_link_net(const struct net_device *dev) | |
1159 | { | |
1160 | struct ppp *ppp = netdev_priv(dev); | |
1161 | ||
1162 | return ppp->ppp_net; | |
1163 | } | |
1164 | ||
1165 | static struct rtnl_link_ops ppp_link_ops __read_mostly = { | |
1166 | .kind = "ppp", | |
1167 | .maxtype = IFLA_PPP_MAX, | |
1168 | .policy = ppp_nl_policy, | |
1169 | .priv_size = sizeof(struct ppp), | |
1170 | .setup = ppp_setup, | |
1171 | .validate = ppp_nl_validate, | |
1172 | .newlink = ppp_nl_newlink, | |
1173 | .dellink = ppp_nl_dellink, | |
1174 | .get_size = ppp_nl_get_size, | |
1175 | .fill_info = ppp_nl_fill_info, | |
1176 | .get_link_net = ppp_nl_get_link_net, | |
1177 | }; | |
1178 | ||
1da177e4 LT |
1179 | #define PPP_MAJOR 108 |
1180 | ||
1181 | /* Called at boot time if ppp is compiled into the kernel, | |
1182 | or at module load time (from init_module) if compiled as a module. */ | |
1183 | static int __init ppp_init(void) | |
1184 | { | |
1185 | int err; | |
1186 | ||
b48f8c23 | 1187 | pr_info("PPP generic driver version " PPP_VERSION "\n"); |
273ec51d | 1188 | |
741a6fa2 | 1189 | err = register_pernet_device(&ppp_net_ops); |
273ec51d | 1190 | if (err) { |
b48f8c23 | 1191 | pr_err("failed to register PPP pernet device (%d)\n", err); |
273ec51d | 1192 | goto out; |
1da177e4 LT |
1193 | } |
1194 | ||
273ec51d CG |
1195 | err = register_chrdev(PPP_MAJOR, "ppp", &ppp_device_fops); |
1196 | if (err) { | |
b48f8c23 | 1197 | pr_err("failed to register PPP device (%d)\n", err); |
273ec51d CG |
1198 | goto out_net; |
1199 | } | |
1200 | ||
1201 | ppp_class = class_create(THIS_MODULE, "ppp"); | |
1202 | if (IS_ERR(ppp_class)) { | |
1203 | err = PTR_ERR(ppp_class); | |
1204 | goto out_chrdev; | |
1205 | } | |
1206 | ||
96d934c7 GN |
1207 | err = rtnl_link_register(&ppp_link_ops); |
1208 | if (err) { | |
1209 | pr_err("failed to register rtnetlink PPP handler\n"); | |
1210 | goto out_class; | |
1211 | } | |
1212 | ||
273ec51d CG |
1213 | /* not a big deal if we fail here :-) */ |
1214 | device_create(ppp_class, NULL, MKDEV(PPP_MAJOR, 0), NULL, "ppp"); | |
1215 | ||
1216 | return 0; | |
1da177e4 | 1217 | |
96d934c7 GN |
1218 | out_class: |
1219 | class_destroy(ppp_class); | |
1da177e4 LT |
1220 | out_chrdev: |
1221 | unregister_chrdev(PPP_MAJOR, "ppp"); | |
273ec51d | 1222 | out_net: |
741a6fa2 | 1223 | unregister_pernet_device(&ppp_net_ops); |
273ec51d CG |
1224 | out: |
1225 | return err; | |
1da177e4 LT |
1226 | } |
1227 | ||
1228 | /* | |
1229 | * Network interface unit routines. | |
1230 | */ | |
424efe9c | 1231 | static netdev_tx_t |
1da177e4 LT |
1232 | ppp_start_xmit(struct sk_buff *skb, struct net_device *dev) |
1233 | { | |
c8019bf3 | 1234 | struct ppp *ppp = netdev_priv(dev); |
1da177e4 LT |
1235 | int npi, proto; |
1236 | unsigned char *pp; | |
1237 | ||
1238 | npi = ethertype_to_npindex(ntohs(skb->protocol)); | |
1239 | if (npi < 0) | |
1240 | goto outf; | |
1241 | ||
1242 | /* Drop, accept or reject the packet */ | |
1243 | switch (ppp->npmode[npi]) { | |
1244 | case NPMODE_PASS: | |
1245 | break; | |
1246 | case NPMODE_QUEUE: | |
1247 | /* it would be nice to have a way to tell the network | |
1248 | system to queue this one up for later. */ | |
1249 | goto outf; | |
1250 | case NPMODE_DROP: | |
1251 | case NPMODE_ERROR: | |
1252 | goto outf; | |
1253 | } | |
1254 | ||
1255 | /* Put the 2-byte PPP protocol number on the front, | |
1256 | making sure there is room for the address and control fields. */ | |
7b797d5b HX |
1257 | if (skb_cow_head(skb, PPP_HDRLEN)) |
1258 | goto outf; | |
1259 | ||
1da177e4 LT |
1260 | pp = skb_push(skb, 2); |
1261 | proto = npindex_to_proto[npi]; | |
96545aeb | 1262 | put_unaligned_be16(proto, pp); |
1da177e4 | 1263 | |
79c441ae | 1264 | skb_scrub_packet(skb, !net_eq(ppp->ppp_net, dev_net(dev))); |
1da177e4 | 1265 | skb_queue_tail(&ppp->file.xq, skb); |
9a5d2bd9 | 1266 | ppp_xmit_process(ppp); |
6ed10654 | 1267 | return NETDEV_TX_OK; |
1da177e4 LT |
1268 | |
1269 | outf: | |
1270 | kfree_skb(skb); | |
6ceffd47 | 1271 | ++dev->stats.tx_dropped; |
6ed10654 | 1272 | return NETDEV_TX_OK; |
1da177e4 LT |
1273 | } |
1274 | ||
1da177e4 LT |
1275 | static int |
1276 | ppp_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
1277 | { | |
c8019bf3 | 1278 | struct ppp *ppp = netdev_priv(dev); |
1da177e4 LT |
1279 | int err = -EFAULT; |
1280 | void __user *addr = (void __user *) ifr->ifr_ifru.ifru_data; | |
1281 | struct ppp_stats stats; | |
1282 | struct ppp_comp_stats cstats; | |
1283 | char *vers; | |
1284 | ||
1285 | switch (cmd) { | |
1286 | case SIOCGPPPSTATS: | |
1287 | ppp_get_stats(ppp, &stats); | |
1288 | if (copy_to_user(addr, &stats, sizeof(stats))) | |
1289 | break; | |
1290 | err = 0; | |
1291 | break; | |
1292 | ||
1293 | case SIOCGPPPCSTATS: | |
1294 | memset(&cstats, 0, sizeof(cstats)); | |
cd228d54 | 1295 | if (ppp->xc_state) |
1da177e4 | 1296 | ppp->xcomp->comp_stat(ppp->xc_state, &cstats.c); |
cd228d54 | 1297 | if (ppp->rc_state) |
1da177e4 LT |
1298 | ppp->rcomp->decomp_stat(ppp->rc_state, &cstats.d); |
1299 | if (copy_to_user(addr, &cstats, sizeof(cstats))) | |
1300 | break; | |
1301 | err = 0; | |
1302 | break; | |
1303 | ||
1304 | case SIOCGPPPVER: | |
1305 | vers = PPP_VERSION; | |
1306 | if (copy_to_user(addr, vers, strlen(vers) + 1)) | |
1307 | break; | |
1308 | err = 0; | |
1309 | break; | |
1310 | ||
1311 | default: | |
1312 | err = -EINVAL; | |
1313 | } | |
1314 | ||
1315 | return err; | |
1316 | } | |
1317 | ||
bc1f4470 | 1318 | static void |
e51f6ff3 KG |
1319 | ppp_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats64) |
1320 | { | |
1321 | struct ppp *ppp = netdev_priv(dev); | |
1322 | ||
1323 | ppp_recv_lock(ppp); | |
1324 | stats64->rx_packets = ppp->stats64.rx_packets; | |
1325 | stats64->rx_bytes = ppp->stats64.rx_bytes; | |
1326 | ppp_recv_unlock(ppp); | |
1327 | ||
1328 | ppp_xmit_lock(ppp); | |
1329 | stats64->tx_packets = ppp->stats64.tx_packets; | |
1330 | stats64->tx_bytes = ppp->stats64.tx_bytes; | |
1331 | ppp_xmit_unlock(ppp); | |
1332 | ||
1333 | stats64->rx_errors = dev->stats.rx_errors; | |
1334 | stats64->tx_errors = dev->stats.tx_errors; | |
1335 | stats64->rx_dropped = dev->stats.rx_dropped; | |
1336 | stats64->tx_dropped = dev->stats.tx_dropped; | |
1337 | stats64->rx_length_errors = dev->stats.rx_length_errors; | |
e51f6ff3 KG |
1338 | } |
1339 | ||
303c07db ED |
1340 | static int ppp_dev_init(struct net_device *dev) |
1341 | { | |
d3fff6c4 | 1342 | netdev_lockdep_set_classes(dev); |
303c07db ED |
1343 | return 0; |
1344 | } | |
1345 | ||
8cb775bc GN |
1346 | static void ppp_dev_uninit(struct net_device *dev) |
1347 | { | |
1348 | struct ppp *ppp = netdev_priv(dev); | |
1349 | struct ppp_net *pn = ppp_pernet(ppp->ppp_net); | |
1350 | ||
1351 | ppp_lock(ppp); | |
1352 | ppp->closing = 1; | |
1353 | ppp_unlock(ppp); | |
1354 | ||
1355 | mutex_lock(&pn->all_ppp_mutex); | |
1356 | unit_put(&pn->units_idr, ppp->file.index); | |
1357 | mutex_unlock(&pn->all_ppp_mutex); | |
1358 | ||
1359 | ppp->owner = NULL; | |
1360 | ||
1361 | ppp->file.dead = 1; | |
1362 | wake_up_interruptible(&ppp->file.rwait); | |
1363 | } | |
1364 | ||
52256cfc | 1365 | static const struct net_device_ops ppp_netdev_ops = { |
303c07db | 1366 | .ndo_init = ppp_dev_init, |
8cb775bc | 1367 | .ndo_uninit = ppp_dev_uninit, |
e51f6ff3 KG |
1368 | .ndo_start_xmit = ppp_start_xmit, |
1369 | .ndo_do_ioctl = ppp_net_ioctl, | |
1370 | .ndo_get_stats64 = ppp_get_stats64, | |
52256cfc SH |
1371 | }; |
1372 | ||
94dbffe1 GN |
1373 | static struct device_type ppp_type = { |
1374 | .name = "ppp", | |
1375 | }; | |
1376 | ||
1da177e4 LT |
1377 | static void ppp_setup(struct net_device *dev) |
1378 | { | |
52256cfc | 1379 | dev->netdev_ops = &ppp_netdev_ops; |
94dbffe1 GN |
1380 | SET_NETDEV_DEVTYPE(dev, &ppp_type); |
1381 | ||
07712770 GN |
1382 | dev->features |= NETIF_F_LLTX; |
1383 | ||
1da177e4 | 1384 | dev->hard_header_len = PPP_HDRLEN; |
bf7daebb | 1385 | dev->mtu = PPP_MRU; |
1da177e4 LT |
1386 | dev->addr_len = 0; |
1387 | dev->tx_queue_len = 3; | |
1388 | dev->type = ARPHRD_PPP; | |
1389 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
02875878 | 1390 | netif_keep_dst(dev); |
1da177e4 LT |
1391 | } |
1392 | ||
1393 | /* | |
1394 | * Transmit-side routines. | |
1395 | */ | |
1396 | ||
55454a56 GN |
1397 | /* Called to do any work queued up on the transmit side that can now be done */ |
1398 | static void __ppp_xmit_process(struct ppp *ppp) | |
1da177e4 LT |
1399 | { |
1400 | struct sk_buff *skb; | |
1401 | ||
1402 | ppp_xmit_lock(ppp); | |
739840d5 | 1403 | if (!ppp->closing) { |
1da177e4 | 1404 | ppp_push(ppp); |
8e95a202 JP |
1405 | while (!ppp->xmit_pending && |
1406 | (skb = skb_dequeue(&ppp->file.xq))) | |
1da177e4 LT |
1407 | ppp_send_frame(ppp, skb); |
1408 | /* If there's no work left to do, tell the core net | |
1409 | code that we can accept some more. */ | |
9a5d2bd9 | 1410 | if (!ppp->xmit_pending && !skb_peek(&ppp->file.xq)) |
1da177e4 | 1411 | netif_wake_queue(ppp->dev); |
9a5d2bd9 DW |
1412 | else |
1413 | netif_stop_queue(ppp->dev); | |
1da177e4 LT |
1414 | } |
1415 | ppp_xmit_unlock(ppp); | |
1416 | } | |
1417 | ||
55454a56 GN |
1418 | static void ppp_xmit_process(struct ppp *ppp) |
1419 | { | |
1420 | local_bh_disable(); | |
1421 | ||
e5dadc65 | 1422 | if (unlikely(*this_cpu_ptr(ppp->xmit_recursion))) |
55454a56 GN |
1423 | goto err; |
1424 | ||
e5dadc65 | 1425 | (*this_cpu_ptr(ppp->xmit_recursion))++; |
55454a56 | 1426 | __ppp_xmit_process(ppp); |
e5dadc65 | 1427 | (*this_cpu_ptr(ppp->xmit_recursion))--; |
55454a56 GN |
1428 | |
1429 | local_bh_enable(); | |
1430 | ||
1431 | return; | |
1432 | ||
1433 | err: | |
1434 | local_bh_enable(); | |
1435 | ||
1436 | if (net_ratelimit()) | |
1437 | netdev_err(ppp->dev, "recursion detected\n"); | |
1438 | } | |
1439 | ||
b3f9b92a MD |
1440 | static inline struct sk_buff * |
1441 | pad_compress_skb(struct ppp *ppp, struct sk_buff *skb) | |
1442 | { | |
1443 | struct sk_buff *new_skb; | |
1444 | int len; | |
1445 | int new_skb_size = ppp->dev->mtu + | |
1446 | ppp->xcomp->comp_extra + ppp->dev->hard_header_len; | |
1447 | int compressor_skb_size = ppp->dev->mtu + | |
1448 | ppp->xcomp->comp_extra + PPP_HDRLEN; | |
1449 | new_skb = alloc_skb(new_skb_size, GFP_ATOMIC); | |
1450 | if (!new_skb) { | |
1451 | if (net_ratelimit()) | |
b48f8c23 | 1452 | netdev_err(ppp->dev, "PPP: no memory (comp pkt)\n"); |
b3f9b92a MD |
1453 | return NULL; |
1454 | } | |
1455 | if (ppp->dev->hard_header_len > PPP_HDRLEN) | |
1456 | skb_reserve(new_skb, | |
1457 | ppp->dev->hard_header_len - PPP_HDRLEN); | |
1458 | ||
1459 | /* compressor still expects A/C bytes in hdr */ | |
1460 | len = ppp->xcomp->compress(ppp->xc_state, skb->data - 2, | |
1461 | new_skb->data, skb->len + 2, | |
1462 | compressor_skb_size); | |
1463 | if (len > 0 && (ppp->flags & SC_CCP_UP)) { | |
968d7018 | 1464 | consume_skb(skb); |
b3f9b92a MD |
1465 | skb = new_skb; |
1466 | skb_put(skb, len); | |
1467 | skb_pull(skb, 2); /* pull off A/C bytes */ | |
1468 | } else if (len == 0) { | |
1469 | /* didn't compress, or CCP not up yet */ | |
968d7018 | 1470 | consume_skb(new_skb); |
b3f9b92a MD |
1471 | new_skb = skb; |
1472 | } else { | |
1473 | /* | |
1474 | * (len < 0) | |
1475 | * MPPE requires that we do not send unencrypted | |
1476 | * frames. The compressor will return -1 if we | |
1477 | * should drop the frame. We cannot simply test | |
1478 | * the compress_proto because MPPE and MPPC share | |
1479 | * the same number. | |
1480 | */ | |
1481 | if (net_ratelimit()) | |
b48f8c23 | 1482 | netdev_err(ppp->dev, "ppp: compressor dropped pkt\n"); |
b3f9b92a | 1483 | kfree_skb(skb); |
968d7018 | 1484 | consume_skb(new_skb); |
b3f9b92a MD |
1485 | new_skb = NULL; |
1486 | } | |
1487 | return new_skb; | |
1488 | } | |
1489 | ||
1da177e4 LT |
1490 | /* |
1491 | * Compress and send a frame. | |
1492 | * The caller should have locked the xmit path, | |
1493 | * and xmit_pending should be 0. | |
1494 | */ | |
1495 | static void | |
1496 | ppp_send_frame(struct ppp *ppp, struct sk_buff *skb) | |
1497 | { | |
1498 | int proto = PPP_PROTO(skb); | |
1499 | struct sk_buff *new_skb; | |
1500 | int len; | |
1501 | unsigned char *cp; | |
1502 | ||
1503 | if (proto < 0x8000) { | |
1504 | #ifdef CONFIG_PPP_FILTER | |
1505 | /* check if we should pass this packet */ | |
1506 | /* the filter instructions are constructed assuming | |
1507 | a four-byte PPP header on each packet */ | |
d58ff351 | 1508 | *(u8 *)skb_push(skb, 2) = 1; |
8e95a202 | 1509 | if (ppp->pass_filter && |
7ae457c1 | 1510 | BPF_PROG_RUN(ppp->pass_filter, skb) == 0) { |
1da177e4 | 1511 | if (ppp->debug & 1) |
b48f8c23 DM |
1512 | netdev_printk(KERN_DEBUG, ppp->dev, |
1513 | "PPP: outbound frame " | |
1514 | "not passed\n"); | |
1da177e4 LT |
1515 | kfree_skb(skb); |
1516 | return; | |
1517 | } | |
1518 | /* if this packet passes the active filter, record the time */ | |
8e95a202 | 1519 | if (!(ppp->active_filter && |
7ae457c1 | 1520 | BPF_PROG_RUN(ppp->active_filter, skb) == 0)) |
1da177e4 LT |
1521 | ppp->last_xmit = jiffies; |
1522 | skb_pull(skb, 2); | |
1523 | #else | |
1524 | /* for data packets, record the time */ | |
1525 | ppp->last_xmit = jiffies; | |
1526 | #endif /* CONFIG_PPP_FILTER */ | |
1527 | } | |
1528 | ||
e51f6ff3 KG |
1529 | ++ppp->stats64.tx_packets; |
1530 | ppp->stats64.tx_bytes += skb->len - 2; | |
1da177e4 LT |
1531 | |
1532 | switch (proto) { | |
1533 | case PPP_IP: | |
cd228d54 | 1534 | if (!ppp->vj || (ppp->flags & SC_COMP_TCP) == 0) |
1da177e4 LT |
1535 | break; |
1536 | /* try to do VJ TCP header compression */ | |
1537 | new_skb = alloc_skb(skb->len + ppp->dev->hard_header_len - 2, | |
1538 | GFP_ATOMIC); | |
cd228d54 | 1539 | if (!new_skb) { |
b48f8c23 | 1540 | netdev_err(ppp->dev, "PPP: no memory (VJ comp pkt)\n"); |
1da177e4 LT |
1541 | goto drop; |
1542 | } | |
1543 | skb_reserve(new_skb, ppp->dev->hard_header_len - 2); | |
1544 | cp = skb->data + 2; | |
1545 | len = slhc_compress(ppp->vj, cp, skb->len - 2, | |
1546 | new_skb->data + 2, &cp, | |
1547 | !(ppp->flags & SC_NO_TCP_CCID)); | |
1548 | if (cp == skb->data + 2) { | |
1549 | /* didn't compress */ | |
968d7018 | 1550 | consume_skb(new_skb); |
1da177e4 LT |
1551 | } else { |
1552 | if (cp[0] & SL_TYPE_COMPRESSED_TCP) { | |
1553 | proto = PPP_VJC_COMP; | |
1554 | cp[0] &= ~SL_TYPE_COMPRESSED_TCP; | |
1555 | } else { | |
1556 | proto = PPP_VJC_UNCOMP; | |
1557 | cp[0] = skb->data[2]; | |
1558 | } | |
968d7018 | 1559 | consume_skb(skb); |
1da177e4 LT |
1560 | skb = new_skb; |
1561 | cp = skb_put(skb, len + 2); | |
1562 | cp[0] = 0; | |
1563 | cp[1] = proto; | |
1564 | } | |
1565 | break; | |
1566 | ||
1567 | case PPP_CCP: | |
1568 | /* peek at outbound CCP frames */ | |
1569 | ppp_ccp_peek(ppp, skb, 0); | |
1570 | break; | |
1571 | } | |
1572 | ||
1573 | /* try to do packet compression */ | |
8e95a202 JP |
1574 | if ((ppp->xstate & SC_COMP_RUN) && ppp->xc_state && |
1575 | proto != PPP_LCP && proto != PPP_CCP) { | |
b3f9b92a MD |
1576 | if (!(ppp->flags & SC_CCP_UP) && (ppp->flags & SC_MUST_COMP)) { |
1577 | if (net_ratelimit()) | |
b48f8c23 DM |
1578 | netdev_err(ppp->dev, |
1579 | "ppp: compression required but " | |
1580 | "down - pkt dropped.\n"); | |
1da177e4 LT |
1581 | goto drop; |
1582 | } | |
b3f9b92a MD |
1583 | skb = pad_compress_skb(ppp, skb); |
1584 | if (!skb) | |
1585 | goto drop; | |
1da177e4 LT |
1586 | } |
1587 | ||
1588 | /* | |
1589 | * If we are waiting for traffic (demand dialling), | |
1590 | * queue it up for pppd to receive. | |
1591 | */ | |
1592 | if (ppp->flags & SC_LOOP_TRAFFIC) { | |
1593 | if (ppp->file.rq.qlen > PPP_MAX_RQLEN) | |
1594 | goto drop; | |
1595 | skb_queue_tail(&ppp->file.rq, skb); | |
1596 | wake_up_interruptible(&ppp->file.rwait); | |
1597 | return; | |
1598 | } | |
1599 | ||
1600 | ppp->xmit_pending = skb; | |
1601 | ppp_push(ppp); | |
1602 | return; | |
1603 | ||
1604 | drop: | |
1d2f8c95 | 1605 | kfree_skb(skb); |
8c0469cd | 1606 | ++ppp->dev->stats.tx_errors; |
1da177e4 LT |
1607 | } |
1608 | ||
1609 | /* | |
1610 | * Try to send the frame in xmit_pending. | |
1611 | * The caller should have the xmit path locked. | |
1612 | */ | |
1613 | static void | |
1614 | ppp_push(struct ppp *ppp) | |
1615 | { | |
1616 | struct list_head *list; | |
1617 | struct channel *pch; | |
1618 | struct sk_buff *skb = ppp->xmit_pending; | |
1619 | ||
cd228d54 | 1620 | if (!skb) |
1da177e4 LT |
1621 | return; |
1622 | ||
1623 | list = &ppp->channels; | |
1624 | if (list_empty(list)) { | |
1625 | /* nowhere to send the packet, just drop it */ | |
1626 | ppp->xmit_pending = NULL; | |
1627 | kfree_skb(skb); | |
1628 | return; | |
1629 | } | |
1630 | ||
1631 | if ((ppp->flags & SC_MULTILINK) == 0) { | |
1632 | /* not doing multilink: send it down the first channel */ | |
1633 | list = list->next; | |
1634 | pch = list_entry(list, struct channel, clist); | |
1635 | ||
97fcc193 | 1636 | spin_lock(&pch->downl); |
1da177e4 LT |
1637 | if (pch->chan) { |
1638 | if (pch->chan->ops->start_xmit(pch->chan, skb)) | |
1639 | ppp->xmit_pending = NULL; | |
1640 | } else { | |
1641 | /* channel got unregistered */ | |
1642 | kfree_skb(skb); | |
1643 | ppp->xmit_pending = NULL; | |
1644 | } | |
97fcc193 | 1645 | spin_unlock(&pch->downl); |
1da177e4 LT |
1646 | return; |
1647 | } | |
1648 | ||
1649 | #ifdef CONFIG_PPP_MULTILINK | |
1650 | /* Multilink: fragment the packet over as many links | |
1651 | as can take the packet at the moment. */ | |
1652 | if (!ppp_mp_explode(ppp, skb)) | |
1653 | return; | |
1654 | #endif /* CONFIG_PPP_MULTILINK */ | |
1655 | ||
1656 | ppp->xmit_pending = NULL; | |
1657 | kfree_skb(skb); | |
1658 | } | |
1659 | ||
1660 | #ifdef CONFIG_PPP_MULTILINK | |
d39cd5e9 | 1661 | static bool mp_protocol_compress __read_mostly = true; |
1662 | module_param(mp_protocol_compress, bool, S_IRUGO | S_IWUSR); | |
1663 | MODULE_PARM_DESC(mp_protocol_compress, | |
1664 | "compress protocol id in multilink fragments"); | |
1665 | ||
1da177e4 LT |
1666 | /* |
1667 | * Divide a packet to be transmitted into fragments and | |
1668 | * send them out the individual links. | |
1669 | */ | |
1670 | static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb) | |
1671 | { | |
fa44a73c LS |
1672 | int len, totlen; |
1673 | int i, bits, hdrlen, mtu; | |
1674 | int flen; | |
1675 | int navail, nfree, nzero; | |
1676 | int nbigger; | |
1677 | int totspeed; | |
1678 | int totfree; | |
1da177e4 LT |
1679 | unsigned char *p, *q; |
1680 | struct list_head *list; | |
1681 | struct channel *pch; | |
1682 | struct sk_buff *frag; | |
1683 | struct ppp_channel *chan; | |
1684 | ||
9c705260 | 1685 | totspeed = 0; /*total bitrate of the bundle*/ |
fa44a73c LS |
1686 | nfree = 0; /* # channels which have no packet already queued */ |
1687 | navail = 0; /* total # of usable channels (not deregistered) */ | |
1688 | nzero = 0; /* number of channels with zero speed associated*/ | |
1689 | totfree = 0; /*total # of channels available and | |
9c705260 GP |
1690 | *having no queued packets before |
1691 | *starting the fragmentation*/ | |
1692 | ||
1da177e4 | 1693 | hdrlen = (ppp->flags & SC_MP_XSHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN; |
fa44a73c LS |
1694 | i = 0; |
1695 | list_for_each_entry(pch, &ppp->channels, clist) { | |
3429769b DC |
1696 | if (pch->chan) { |
1697 | pch->avail = 1; | |
1698 | navail++; | |
1699 | pch->speed = pch->chan->speed; | |
1700 | } else { | |
1701 | pch->avail = 0; | |
1702 | } | |
fa44a73c | 1703 | if (pch->avail) { |
b03efcfb | 1704 | if (skb_queue_empty(&pch->file.xq) || |
fa44a73c | 1705 | !pch->had_frag) { |
9c705260 GP |
1706 | if (pch->speed == 0) |
1707 | nzero++; | |
1708 | else | |
1709 | totspeed += pch->speed; | |
1710 | ||
1711 | pch->avail = 2; | |
1712 | ++nfree; | |
1713 | ++totfree; | |
1714 | } | |
fa44a73c LS |
1715 | if (!pch->had_frag && i < ppp->nxchan) |
1716 | ppp->nxchan = i; | |
1da177e4 | 1717 | } |
516cd15f | 1718 | ++i; |
1da177e4 | 1719 | } |
516cd15f | 1720 | /* |
fa44a73c LS |
1721 | * Don't start sending this packet unless at least half of |
1722 | * the channels are free. This gives much better TCP | |
1723 | * performance if we have a lot of channels. | |
516cd15f | 1724 | */ |
fa44a73c LS |
1725 | if (nfree == 0 || nfree < navail / 2) |
1726 | return 0; /* can't take now, leave it in xmit_pending */ | |
1da177e4 | 1727 | |
d39cd5e9 | 1728 | /* Do protocol field compression */ |
fa44a73c LS |
1729 | p = skb->data; |
1730 | len = skb->len; | |
d39cd5e9 | 1731 | if (*p == 0 && mp_protocol_compress) { |
1da177e4 LT |
1732 | ++p; |
1733 | --len; | |
1734 | } | |
1735 | ||
9c705260 | 1736 | totlen = len; |
fa44a73c | 1737 | nbigger = len % nfree; |
9c705260 | 1738 | |
fa44a73c LS |
1739 | /* skip to the channel after the one we last used |
1740 | and start at that one */ | |
81616c5a | 1741 | list = &ppp->channels; |
fa44a73c | 1742 | for (i = 0; i < ppp->nxchan; ++i) { |
1da177e4 | 1743 | list = list->next; |
fa44a73c LS |
1744 | if (list == &ppp->channels) { |
1745 | i = 0; | |
1da177e4 LT |
1746 | break; |
1747 | } | |
1748 | } | |
1749 | ||
fa44a73c | 1750 | /* create a fragment for each channel */ |
1da177e4 | 1751 | bits = B; |
fa44a73c | 1752 | while (len > 0) { |
1da177e4 | 1753 | list = list->next; |
fa44a73c LS |
1754 | if (list == &ppp->channels) { |
1755 | i = 0; | |
1da177e4 LT |
1756 | continue; |
1757 | } | |
fa44a73c | 1758 | pch = list_entry(list, struct channel, clist); |
1da177e4 LT |
1759 | ++i; |
1760 | if (!pch->avail) | |
1761 | continue; | |
1762 | ||
516cd15f | 1763 | /* |
fa44a73c LS |
1764 | * Skip this channel if it has a fragment pending already and |
1765 | * we haven't given a fragment to all of the free channels. | |
516cd15f PM |
1766 | */ |
1767 | if (pch->avail == 1) { | |
fa44a73c | 1768 | if (nfree > 0) |
516cd15f PM |
1769 | continue; |
1770 | } else { | |
516cd15f PM |
1771 | pch->avail = 1; |
1772 | } | |
1773 | ||
1da177e4 | 1774 | /* check the channel's mtu and whether it is still attached. */ |
97fcc193 | 1775 | spin_lock(&pch->downl); |
516cd15f | 1776 | if (pch->chan == NULL) { |
fa44a73c | 1777 | /* can't use this channel, it's being deregistered */ |
9c705260 GP |
1778 | if (pch->speed == 0) |
1779 | nzero--; | |
1780 | else | |
fa44a73c | 1781 | totspeed -= pch->speed; |
9c705260 | 1782 | |
97fcc193 | 1783 | spin_unlock(&pch->downl); |
1da177e4 | 1784 | pch->avail = 0; |
9c705260 GP |
1785 | totlen = len; |
1786 | totfree--; | |
1787 | nfree--; | |
fa44a73c | 1788 | if (--navail == 0) |
1da177e4 LT |
1789 | break; |
1790 | continue; | |
1791 | } | |
1792 | ||
1793 | /* | |
9c705260 | 1794 | *if the channel speed is not set divide |
fa44a73c | 1795 | *the packet evenly among the free channels; |
9c705260 GP |
1796 | *otherwise divide it according to the speed |
1797 | *of the channel we are going to transmit on | |
1798 | */ | |
886f9fe6 | 1799 | flen = len; |
a53a8b56 BM |
1800 | if (nfree > 0) { |
1801 | if (pch->speed == 0) { | |
536e00e5 | 1802 | flen = len/nfree; |
a53a8b56 BM |
1803 | if (nbigger > 0) { |
1804 | flen++; | |
1805 | nbigger--; | |
1806 | } | |
1807 | } else { | |
1808 | flen = (((totfree - nzero)*(totlen + hdrlen*totfree)) / | |
1809 | ((totspeed*totfree)/pch->speed)) - hdrlen; | |
1810 | if (nbigger > 0) { | |
1811 | flen += ((totfree - nzero)*pch->speed)/totspeed; | |
1812 | nbigger -= ((totfree - nzero)*pch->speed)/ | |
9c705260 | 1813 | totspeed; |
a53a8b56 | 1814 | } |
9c705260 | 1815 | } |
a53a8b56 | 1816 | nfree--; |
9c705260 | 1817 | } |
9c705260 GP |
1818 | |
1819 | /* | |
fa44a73c | 1820 | *check if we are on the last channel or |
25985edc | 1821 | *we exceded the length of the data to |
9c705260 GP |
1822 | *fragment |
1823 | */ | |
a53a8b56 | 1824 | if ((nfree <= 0) || (flen > len)) |
9c705260 GP |
1825 | flen = len; |
1826 | /* | |
1827 | *it is not worth to tx on slow channels: | |
1828 | *in that case from the resulting flen according to the | |
1829 | *above formula will be equal or less than zero. | |
1830 | *Skip the channel in this case | |
1da177e4 | 1831 | */ |
fa44a73c | 1832 | if (flen <= 0) { |
9c705260 | 1833 | pch->avail = 2; |
97fcc193 | 1834 | spin_unlock(&pch->downl); |
9c705260 GP |
1835 | continue; |
1836 | } | |
1837 | ||
22e83a29 HW |
1838 | /* |
1839 | * hdrlen includes the 2-byte PPP protocol field, but the | |
1840 | * MTU counts only the payload excluding the protocol field. | |
1841 | * (RFC1661 Section 2) | |
1842 | */ | |
1843 | mtu = pch->chan->mtu - (hdrlen - 2); | |
fa44a73c LS |
1844 | if (mtu < 4) |
1845 | mtu = 4; | |
516cd15f PM |
1846 | if (flen > mtu) |
1847 | flen = mtu; | |
fa44a73c LS |
1848 | if (flen == len) |
1849 | bits |= E; | |
1850 | frag = alloc_skb(flen + hdrlen + (flen == 0), GFP_ATOMIC); | |
cd228d54 | 1851 | if (!frag) |
516cd15f | 1852 | goto noskb; |
fa44a73c | 1853 | q = skb_put(frag, flen + hdrlen); |
516cd15f | 1854 | |
fa44a73c | 1855 | /* make the MP header */ |
96545aeb | 1856 | put_unaligned_be16(PPP_MP, q); |
516cd15f | 1857 | if (ppp->flags & SC_MP_XSHORTSEQ) { |
fa44a73c | 1858 | q[2] = bits + ((ppp->nxseq >> 8) & 0xf); |
516cd15f PM |
1859 | q[3] = ppp->nxseq; |
1860 | } else { | |
1861 | q[2] = bits; | |
1862 | q[3] = ppp->nxseq >> 16; | |
1863 | q[4] = ppp->nxseq >> 8; | |
1864 | q[5] = ppp->nxseq; | |
1da177e4 | 1865 | } |
516cd15f | 1866 | |
9c705260 | 1867 | memcpy(q + hdrlen, p, flen); |
516cd15f PM |
1868 | |
1869 | /* try to send it down the channel */ | |
1870 | chan = pch->chan; | |
fa44a73c | 1871 | if (!skb_queue_empty(&pch->file.xq) || |
9c705260 | 1872 | !chan->ops->start_xmit(chan, frag)) |
516cd15f | 1873 | skb_queue_tail(&pch->file.xq, frag); |
fa44a73c | 1874 | pch->had_frag = 1; |
516cd15f | 1875 | p += flen; |
fa44a73c | 1876 | len -= flen; |
516cd15f PM |
1877 | ++ppp->nxseq; |
1878 | bits = 0; | |
97fcc193 | 1879 | spin_unlock(&pch->downl); |
516cd15f | 1880 | } |
fa44a73c | 1881 | ppp->nxchan = i; |
1da177e4 LT |
1882 | |
1883 | return 1; | |
1884 | ||
1885 | noskb: | |
97fcc193 | 1886 | spin_unlock(&pch->downl); |
1da177e4 | 1887 | if (ppp->debug & 1) |
b48f8c23 | 1888 | netdev_err(ppp->dev, "PPP: no memory (fragment)\n"); |
8c0469cd | 1889 | ++ppp->dev->stats.tx_errors; |
1da177e4 LT |
1890 | ++ppp->nxseq; |
1891 | return 1; /* abandon the frame */ | |
1892 | } | |
1893 | #endif /* CONFIG_PPP_MULTILINK */ | |
1894 | ||
55454a56 GN |
1895 | /* Try to send data out on a channel */ |
1896 | static void __ppp_channel_push(struct channel *pch) | |
1da177e4 LT |
1897 | { |
1898 | struct sk_buff *skb; | |
1899 | struct ppp *ppp; | |
1900 | ||
97fcc193 | 1901 | spin_lock(&pch->downl); |
cd228d54 | 1902 | if (pch->chan) { |
b03efcfb | 1903 | while (!skb_queue_empty(&pch->file.xq)) { |
1da177e4 LT |
1904 | skb = skb_dequeue(&pch->file.xq); |
1905 | if (!pch->chan->ops->start_xmit(pch->chan, skb)) { | |
1906 | /* put the packet back and try again later */ | |
1907 | skb_queue_head(&pch->file.xq, skb); | |
1908 | break; | |
1909 | } | |
1910 | } | |
1911 | } else { | |
1912 | /* channel got deregistered */ | |
1913 | skb_queue_purge(&pch->file.xq); | |
1914 | } | |
97fcc193 | 1915 | spin_unlock(&pch->downl); |
1da177e4 | 1916 | /* see if there is anything from the attached unit to be sent */ |
b03efcfb | 1917 | if (skb_queue_empty(&pch->file.xq)) { |
1da177e4 | 1918 | ppp = pch->ppp; |
cd228d54 | 1919 | if (ppp) |
0a0e1a85 | 1920 | __ppp_xmit_process(ppp); |
1da177e4 LT |
1921 | } |
1922 | } | |
1923 | ||
55454a56 GN |
1924 | static void ppp_channel_push(struct channel *pch) |
1925 | { | |
0a0e1a85 GN |
1926 | read_lock_bh(&pch->upl); |
1927 | if (pch->ppp) { | |
1928 | (*this_cpu_ptr(pch->ppp->xmit_recursion))++; | |
1929 | __ppp_channel_push(pch); | |
1930 | (*this_cpu_ptr(pch->ppp->xmit_recursion))--; | |
1931 | } else { | |
1932 | __ppp_channel_push(pch); | |
1933 | } | |
1934 | read_unlock_bh(&pch->upl); | |
55454a56 GN |
1935 | } |
1936 | ||
1da177e4 LT |
1937 | /* |
1938 | * Receive-side routines. | |
1939 | */ | |
1940 | ||
a00eac0c DM |
1941 | struct ppp_mp_skb_parm { |
1942 | u32 sequence; | |
1943 | u8 BEbits; | |
1944 | }; | |
1945 | #define PPP_MP_CB(skb) ((struct ppp_mp_skb_parm *)((skb)->cb)) | |
1da177e4 LT |
1946 | |
1947 | static inline void | |
1948 | ppp_do_recv(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) | |
1949 | { | |
1950 | ppp_recv_lock(ppp); | |
739840d5 | 1951 | if (!ppp->closing) |
1da177e4 LT |
1952 | ppp_receive_frame(ppp, skb, pch); |
1953 | else | |
1954 | kfree_skb(skb); | |
1955 | ppp_recv_unlock(ppp); | |
1956 | } | |
1957 | ||
1958 | void | |
1959 | ppp_input(struct ppp_channel *chan, struct sk_buff *skb) | |
1960 | { | |
1961 | struct channel *pch = chan->ppp; | |
1962 | int proto; | |
1963 | ||
ea8420e9 | 1964 | if (!pch) { |
1da177e4 LT |
1965 | kfree_skb(skb); |
1966 | return; | |
1967 | } | |
516cd15f | 1968 | |
1da177e4 | 1969 | read_lock_bh(&pch->upl); |
ea8420e9 SA |
1970 | if (!pskb_may_pull(skb, 2)) { |
1971 | kfree_skb(skb); | |
1972 | if (pch->ppp) { | |
1973 | ++pch->ppp->dev->stats.rx_length_errors; | |
1974 | ppp_receive_error(pch->ppp); | |
1975 | } | |
1976 | goto done; | |
1977 | } | |
1978 | ||
1979 | proto = PPP_PROTO(skb); | |
cd228d54 | 1980 | if (!pch->ppp || proto >= 0xc000 || proto == PPP_CCPFRAG) { |
1da177e4 LT |
1981 | /* put it on the channel queue */ |
1982 | skb_queue_tail(&pch->file.rq, skb); | |
1983 | /* drop old frames if queue too long */ | |
8e95a202 JP |
1984 | while (pch->file.rq.qlen > PPP_MAX_RQLEN && |
1985 | (skb = skb_dequeue(&pch->file.rq))) | |
1da177e4 LT |
1986 | kfree_skb(skb); |
1987 | wake_up_interruptible(&pch->file.rwait); | |
1988 | } else { | |
1989 | ppp_do_recv(pch->ppp, skb, pch); | |
1990 | } | |
ea8420e9 SA |
1991 | |
1992 | done: | |
1da177e4 LT |
1993 | read_unlock_bh(&pch->upl); |
1994 | } | |
1995 | ||
1996 | /* Put a 0-length skb in the receive queue as an error indication */ | |
1997 | void | |
1998 | ppp_input_error(struct ppp_channel *chan, int code) | |
1999 | { | |
2000 | struct channel *pch = chan->ppp; | |
2001 | struct sk_buff *skb; | |
2002 | ||
cd228d54 | 2003 | if (!pch) |
1da177e4 LT |
2004 | return; |
2005 | ||
2006 | read_lock_bh(&pch->upl); | |
cd228d54 | 2007 | if (pch->ppp) { |
1da177e4 | 2008 | skb = alloc_skb(0, GFP_ATOMIC); |
cd228d54 | 2009 | if (skb) { |
1da177e4 LT |
2010 | skb->len = 0; /* probably unnecessary */ |
2011 | skb->cb[0] = code; | |
2012 | ppp_do_recv(pch->ppp, skb, pch); | |
2013 | } | |
2014 | } | |
2015 | read_unlock_bh(&pch->upl); | |
2016 | } | |
2017 | ||
2018 | /* | |
2019 | * We come in here to process a received frame. | |
2020 | * The receive side of the ppp unit is locked. | |
2021 | */ | |
2022 | static void | |
2023 | ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) | |
2024 | { | |
ea8420e9 SA |
2025 | /* note: a 0-length skb is used as an error indication */ |
2026 | if (skb->len > 0) { | |
3dfb0534 | 2027 | skb_checksum_complete_unset(skb); |
1da177e4 LT |
2028 | #ifdef CONFIG_PPP_MULTILINK |
2029 | /* XXX do channel-level decompression here */ | |
2030 | if (PPP_PROTO(skb) == PPP_MP) | |
2031 | ppp_receive_mp_frame(ppp, skb, pch); | |
2032 | else | |
2033 | #endif /* CONFIG_PPP_MULTILINK */ | |
2034 | ppp_receive_nonmp_frame(ppp, skb); | |
ea8420e9 SA |
2035 | } else { |
2036 | kfree_skb(skb); | |
2037 | ppp_receive_error(ppp); | |
1da177e4 | 2038 | } |
1da177e4 LT |
2039 | } |
2040 | ||
2041 | static void | |
2042 | ppp_receive_error(struct ppp *ppp) | |
2043 | { | |
8c0469cd | 2044 | ++ppp->dev->stats.rx_errors; |
cd228d54 | 2045 | if (ppp->vj) |
1da177e4 LT |
2046 | slhc_toss(ppp->vj); |
2047 | } | |
2048 | ||
2049 | static void | |
2050 | ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb) | |
2051 | { | |
2052 | struct sk_buff *ns; | |
2053 | int proto, len, npi; | |
2054 | ||
2055 | /* | |
2056 | * Decompress the frame, if compressed. | |
2057 | * Note that some decompressors need to see uncompressed frames | |
2058 | * that come in as well as compressed frames. | |
2059 | */ | |
8e95a202 JP |
2060 | if (ppp->rc_state && (ppp->rstate & SC_DECOMP_RUN) && |
2061 | (ppp->rstate & (SC_DC_FERROR | SC_DC_ERROR)) == 0) | |
1da177e4 LT |
2062 | skb = ppp_decompress_frame(ppp, skb); |
2063 | ||
b3f9b92a MD |
2064 | if (ppp->flags & SC_MUST_COMP && ppp->rstate & SC_DC_FERROR) |
2065 | goto err; | |
2066 | ||
1da177e4 LT |
2067 | proto = PPP_PROTO(skb); |
2068 | switch (proto) { | |
2069 | case PPP_VJC_COMP: | |
2070 | /* decompress VJ compressed packets */ | |
cd228d54 | 2071 | if (!ppp->vj || (ppp->flags & SC_REJ_COMP_TCP)) |
1da177e4 LT |
2072 | goto err; |
2073 | ||
2a38b775 | 2074 | if (skb_tailroom(skb) < 124 || skb_cloned(skb)) { |
1da177e4 LT |
2075 | /* copy to a new sk_buff with more tailroom */ |
2076 | ns = dev_alloc_skb(skb->len + 128); | |
cd228d54 | 2077 | if (!ns) { |
b48f8c23 DM |
2078 | netdev_err(ppp->dev, "PPP: no memory " |
2079 | "(VJ decomp)\n"); | |
1da177e4 LT |
2080 | goto err; |
2081 | } | |
2082 | skb_reserve(ns, 2); | |
2083 | skb_copy_bits(skb, 0, skb_put(ns, skb->len), skb->len); | |
968d7018 | 2084 | consume_skb(skb); |
1da177e4 LT |
2085 | skb = ns; |
2086 | } | |
e3f749c4 HX |
2087 | else |
2088 | skb->ip_summed = CHECKSUM_NONE; | |
1da177e4 LT |
2089 | |
2090 | len = slhc_uncompress(ppp->vj, skb->data + 2, skb->len - 2); | |
2091 | if (len <= 0) { | |
b48f8c23 DM |
2092 | netdev_printk(KERN_DEBUG, ppp->dev, |
2093 | "PPP: VJ decompression error\n"); | |
1da177e4 LT |
2094 | goto err; |
2095 | } | |
2096 | len += 2; | |
2097 | if (len > skb->len) | |
2098 | skb_put(skb, len - skb->len); | |
2099 | else if (len < skb->len) | |
2100 | skb_trim(skb, len); | |
2101 | proto = PPP_IP; | |
2102 | break; | |
2103 | ||
2104 | case PPP_VJC_UNCOMP: | |
cd228d54 | 2105 | if (!ppp->vj || (ppp->flags & SC_REJ_COMP_TCP)) |
1da177e4 | 2106 | goto err; |
6aa20a22 | 2107 | |
1da177e4 LT |
2108 | /* Until we fix the decompressor need to make sure |
2109 | * data portion is linear. | |
2110 | */ | |
6aa20a22 | 2111 | if (!pskb_may_pull(skb, skb->len)) |
1da177e4 LT |
2112 | goto err; |
2113 | ||
2114 | if (slhc_remember(ppp->vj, skb->data + 2, skb->len - 2) <= 0) { | |
b48f8c23 | 2115 | netdev_err(ppp->dev, "PPP: VJ uncompressed error\n"); |
1da177e4 LT |
2116 | goto err; |
2117 | } | |
2118 | proto = PPP_IP; | |
2119 | break; | |
2120 | ||
2121 | case PPP_CCP: | |
2122 | ppp_ccp_peek(ppp, skb, 1); | |
2123 | break; | |
2124 | } | |
2125 | ||
e51f6ff3 KG |
2126 | ++ppp->stats64.rx_packets; |
2127 | ppp->stats64.rx_bytes += skb->len - 2; | |
1da177e4 LT |
2128 | |
2129 | npi = proto_to_npindex(proto); | |
2130 | if (npi < 0) { | |
2131 | /* control or unknown frame - pass it to pppd */ | |
2132 | skb_queue_tail(&ppp->file.rq, skb); | |
2133 | /* limit queue length by dropping old frames */ | |
8e95a202 JP |
2134 | while (ppp->file.rq.qlen > PPP_MAX_RQLEN && |
2135 | (skb = skb_dequeue(&ppp->file.rq))) | |
1da177e4 LT |
2136 | kfree_skb(skb); |
2137 | /* wake up any process polling or blocking on read */ | |
2138 | wake_up_interruptible(&ppp->file.rwait); | |
2139 | ||
2140 | } else { | |
2141 | /* network protocol frame - give it to the kernel */ | |
2142 | ||
2143 | #ifdef CONFIG_PPP_FILTER | |
2144 | /* check if the packet passes the pass and active filters */ | |
2145 | /* the filter instructions are constructed assuming | |
2146 | a four-byte PPP header on each packet */ | |
2a38b775 | 2147 | if (ppp->pass_filter || ppp->active_filter) { |
14bbd6a5 | 2148 | if (skb_unclone(skb, GFP_ATOMIC)) |
2a38b775 HX |
2149 | goto err; |
2150 | ||
d58ff351 | 2151 | *(u8 *)skb_push(skb, 2) = 0; |
8e95a202 | 2152 | if (ppp->pass_filter && |
7ae457c1 | 2153 | BPF_PROG_RUN(ppp->pass_filter, skb) == 0) { |
2a38b775 | 2154 | if (ppp->debug & 1) |
b48f8c23 DM |
2155 | netdev_printk(KERN_DEBUG, ppp->dev, |
2156 | "PPP: inbound frame " | |
2157 | "not passed\n"); | |
2a38b775 HX |
2158 | kfree_skb(skb); |
2159 | return; | |
2160 | } | |
8e95a202 | 2161 | if (!(ppp->active_filter && |
7ae457c1 | 2162 | BPF_PROG_RUN(ppp->active_filter, skb) == 0)) |
2a38b775 HX |
2163 | ppp->last_recv = jiffies; |
2164 | __skb_pull(skb, 2); | |
2165 | } else | |
1da177e4 | 2166 | #endif /* CONFIG_PPP_FILTER */ |
2a38b775 | 2167 | ppp->last_recv = jiffies; |
1da177e4 | 2168 | |
8e95a202 JP |
2169 | if ((ppp->dev->flags & IFF_UP) == 0 || |
2170 | ppp->npmode[npi] != NPMODE_PASS) { | |
1da177e4 LT |
2171 | kfree_skb(skb); |
2172 | } else { | |
cbb042f9 HX |
2173 | /* chop off protocol */ |
2174 | skb_pull_rcsum(skb, 2); | |
1da177e4 LT |
2175 | skb->dev = ppp->dev; |
2176 | skb->protocol = htons(npindex_to_ethertype[npi]); | |
459a98ed | 2177 | skb_reset_mac_header(skb); |
79c441ae GN |
2178 | skb_scrub_packet(skb, !net_eq(ppp->ppp_net, |
2179 | dev_net(ppp->dev))); | |
1da177e4 | 2180 | netif_rx(skb); |
1da177e4 LT |
2181 | } |
2182 | } | |
2183 | return; | |
2184 | ||
2185 | err: | |
2186 | kfree_skb(skb); | |
2187 | ppp_receive_error(ppp); | |
2188 | } | |
2189 | ||
2190 | static struct sk_buff * | |
2191 | ppp_decompress_frame(struct ppp *ppp, struct sk_buff *skb) | |
2192 | { | |
2193 | int proto = PPP_PROTO(skb); | |
2194 | struct sk_buff *ns; | |
2195 | int len; | |
2196 | ||
2197 | /* Until we fix all the decompressor's need to make sure | |
2198 | * data portion is linear. | |
2199 | */ | |
2200 | if (!pskb_may_pull(skb, skb->len)) | |
2201 | goto err; | |
2202 | ||
2203 | if (proto == PPP_COMP) { | |
4b2a8fb3 KS |
2204 | int obuff_size; |
2205 | ||
2206 | switch(ppp->rcomp->compress_proto) { | |
2207 | case CI_MPPE: | |
2208 | obuff_size = ppp->mru + PPP_HDRLEN + 1; | |
2209 | break; | |
2210 | default: | |
2211 | obuff_size = ppp->mru + PPP_HDRLEN; | |
2212 | break; | |
2213 | } | |
2214 | ||
2215 | ns = dev_alloc_skb(obuff_size); | |
cd228d54 | 2216 | if (!ns) { |
b48f8c23 DM |
2217 | netdev_err(ppp->dev, "ppp_decompress_frame: " |
2218 | "no memory\n"); | |
1da177e4 LT |
2219 | goto err; |
2220 | } | |
2221 | /* the decompressor still expects the A/C bytes in the hdr */ | |
2222 | len = ppp->rcomp->decompress(ppp->rc_state, skb->data - 2, | |
06c7af56 | 2223 | skb->len + 2, ns->data, obuff_size); |
1da177e4 LT |
2224 | if (len < 0) { |
2225 | /* Pass the compressed frame to pppd as an | |
2226 | error indication. */ | |
2227 | if (len == DECOMP_FATALERROR) | |
2228 | ppp->rstate |= SC_DC_FERROR; | |
2229 | kfree_skb(ns); | |
2230 | goto err; | |
2231 | } | |
2232 | ||
968d7018 | 2233 | consume_skb(skb); |
1da177e4 LT |
2234 | skb = ns; |
2235 | skb_put(skb, len); | |
2236 | skb_pull(skb, 2); /* pull off the A/C bytes */ | |
2237 | ||
2238 | } else { | |
2239 | /* Uncompressed frame - pass to decompressor so it | |
2240 | can update its dictionary if necessary. */ | |
2241 | if (ppp->rcomp->incomp) | |
2242 | ppp->rcomp->incomp(ppp->rc_state, skb->data - 2, | |
2243 | skb->len + 2); | |
2244 | } | |
2245 | ||
2246 | return skb; | |
2247 | ||
2248 | err: | |
2249 | ppp->rstate |= SC_DC_ERROR; | |
2250 | ppp_receive_error(ppp); | |
2251 | return skb; | |
2252 | } | |
2253 | ||
2254 | #ifdef CONFIG_PPP_MULTILINK | |
2255 | /* | |
2256 | * Receive a multilink frame. | |
2257 | * We put it on the reconstruction queue and then pull off | |
2258 | * as many completed frames as we can. | |
2259 | */ | |
2260 | static void | |
2261 | ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) | |
2262 | { | |
2263 | u32 mask, seq; | |
81616c5a | 2264 | struct channel *ch; |
1da177e4 LT |
2265 | int mphdrlen = (ppp->flags & SC_MP_SHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN; |
2266 | ||
2a38b775 | 2267 | if (!pskb_may_pull(skb, mphdrlen + 1) || ppp->mrru == 0) |
1da177e4 LT |
2268 | goto err; /* no good, throw it away */ |
2269 | ||
2270 | /* Decode sequence number and begin/end bits */ | |
2271 | if (ppp->flags & SC_MP_SHORTSEQ) { | |
2272 | seq = ((skb->data[2] & 0x0f) << 8) | skb->data[3]; | |
2273 | mask = 0xfff; | |
2274 | } else { | |
2275 | seq = (skb->data[3] << 16) | (skb->data[4] << 8)| skb->data[5]; | |
2276 | mask = 0xffffff; | |
2277 | } | |
a00eac0c | 2278 | PPP_MP_CB(skb)->BEbits = skb->data[2]; |
1da177e4 LT |
2279 | skb_pull(skb, mphdrlen); /* pull off PPP and MP headers */ |
2280 | ||
2281 | /* | |
2282 | * Do protocol ID decompression on the first fragment of each packet. | |
2283 | */ | |
a00eac0c | 2284 | if ((PPP_MP_CB(skb)->BEbits & B) && (skb->data[0] & 1)) |
d58ff351 | 2285 | *(u8 *)skb_push(skb, 1) = 0; |
1da177e4 LT |
2286 | |
2287 | /* | |
2288 | * Expand sequence number to 32 bits, making it as close | |
2289 | * as possible to ppp->minseq. | |
2290 | */ | |
2291 | seq |= ppp->minseq & ~mask; | |
2292 | if ((int)(ppp->minseq - seq) > (int)(mask >> 1)) | |
2293 | seq += mask + 1; | |
2294 | else if ((int)(seq - ppp->minseq) > (int)(mask >> 1)) | |
2295 | seq -= mask + 1; /* should never happen */ | |
a00eac0c | 2296 | PPP_MP_CB(skb)->sequence = seq; |
1da177e4 LT |
2297 | pch->lastseq = seq; |
2298 | ||
2299 | /* | |
2300 | * If this packet comes before the next one we were expecting, | |
2301 | * drop it. | |
2302 | */ | |
2303 | if (seq_before(seq, ppp->nextseq)) { | |
2304 | kfree_skb(skb); | |
8c0469cd | 2305 | ++ppp->dev->stats.rx_dropped; |
1da177e4 LT |
2306 | ppp_receive_error(ppp); |
2307 | return; | |
2308 | } | |
2309 | ||
2310 | /* | |
2311 | * Reevaluate minseq, the minimum over all channels of the | |
2312 | * last sequence number received on each channel. Because of | |
2313 | * the increasing sequence number rule, we know that any fragment | |
2314 | * before `minseq' which hasn't arrived is never going to arrive. | |
2315 | * The list of channels can't change because we have the receive | |
2316 | * side of the ppp unit locked. | |
2317 | */ | |
81616c5a | 2318 | list_for_each_entry(ch, &ppp->channels, clist) { |
1da177e4 LT |
2319 | if (seq_before(ch->lastseq, seq)) |
2320 | seq = ch->lastseq; | |
2321 | } | |
2322 | if (seq_before(ppp->minseq, seq)) | |
2323 | ppp->minseq = seq; | |
2324 | ||
2325 | /* Put the fragment on the reconstruction queue */ | |
2326 | ppp_mp_insert(ppp, skb); | |
2327 | ||
2328 | /* If the queue is getting long, don't wait any longer for packets | |
2329 | before the start of the queue. */ | |
38ce7c73 | 2330 | if (skb_queue_len(&ppp->mrq) >= PPP_MP_MAX_QLEN) { |
c6b20d94 | 2331 | struct sk_buff *mskb = skb_peek(&ppp->mrq); |
a00eac0c DM |
2332 | if (seq_before(ppp->minseq, PPP_MP_CB(mskb)->sequence)) |
2333 | ppp->minseq = PPP_MP_CB(mskb)->sequence; | |
38ce7c73 | 2334 | } |
1da177e4 LT |
2335 | |
2336 | /* Pull completed packets off the queue and receive them. */ | |
82b3cc1a BM |
2337 | while ((skb = ppp_mp_reconstruct(ppp))) { |
2338 | if (pskb_may_pull(skb, 2)) | |
2339 | ppp_receive_nonmp_frame(ppp, skb); | |
2340 | else { | |
2341 | ++ppp->dev->stats.rx_length_errors; | |
2342 | kfree_skb(skb); | |
2343 | ppp_receive_error(ppp); | |
2344 | } | |
2345 | } | |
1da177e4 LT |
2346 | |
2347 | return; | |
2348 | ||
2349 | err: | |
2350 | kfree_skb(skb); | |
2351 | ppp_receive_error(ppp); | |
2352 | } | |
2353 | ||
2354 | /* | |
2355 | * Insert a fragment on the MP reconstruction queue. | |
2356 | * The queue is ordered by increasing sequence number. | |
2357 | */ | |
2358 | static void | |
2359 | ppp_mp_insert(struct ppp *ppp, struct sk_buff *skb) | |
2360 | { | |
2361 | struct sk_buff *p; | |
2362 | struct sk_buff_head *list = &ppp->mrq; | |
a00eac0c | 2363 | u32 seq = PPP_MP_CB(skb)->sequence; |
1da177e4 LT |
2364 | |
2365 | /* N.B. we don't need to lock the list lock because we have the | |
2366 | ppp unit receive-side lock. */ | |
13c9821e | 2367 | skb_queue_walk(list, p) { |
a00eac0c | 2368 | if (seq_before(seq, PPP_MP_CB(p)->sequence)) |
1da177e4 | 2369 | break; |
13c9821e | 2370 | } |
43f59c89 | 2371 | __skb_queue_before(list, p, skb); |
1da177e4 LT |
2372 | } |
2373 | ||
2374 | /* | |
2375 | * Reconstruct a packet from the MP fragment queue. | |
2376 | * We go through increasing sequence numbers until we find a | |
2377 | * complete packet, or we get to the sequence number for a fragment | |
2378 | * which hasn't arrived but might still do so. | |
2379 | */ | |
3c582b30 | 2380 | static struct sk_buff * |
1da177e4 LT |
2381 | ppp_mp_reconstruct(struct ppp *ppp) |
2382 | { | |
2383 | u32 seq = ppp->nextseq; | |
2384 | u32 minseq = ppp->minseq; | |
2385 | struct sk_buff_head *list = &ppp->mrq; | |
d52344a7 | 2386 | struct sk_buff *p, *tmp; |
1da177e4 LT |
2387 | struct sk_buff *head, *tail; |
2388 | struct sk_buff *skb = NULL; | |
2389 | int lost = 0, len = 0; | |
2390 | ||
2391 | if (ppp->mrru == 0) /* do nothing until mrru is set */ | |
2392 | return NULL; | |
2393 | head = list->next; | |
2394 | tail = NULL; | |
d52344a7 DM |
2395 | skb_queue_walk_safe(list, p, tmp) { |
2396 | again: | |
a00eac0c | 2397 | if (seq_before(PPP_MP_CB(p)->sequence, seq)) { |
1da177e4 | 2398 | /* this can't happen, anyway ignore the skb */ |
b48f8c23 DM |
2399 | netdev_err(ppp->dev, "ppp_mp_reconstruct bad " |
2400 | "seq %u < %u\n", | |
2401 | PPP_MP_CB(p)->sequence, seq); | |
d52344a7 DM |
2402 | __skb_unlink(p, list); |
2403 | kfree_skb(p); | |
1da177e4 LT |
2404 | continue; |
2405 | } | |
a00eac0c | 2406 | if (PPP_MP_CB(p)->sequence != seq) { |
8a49ad6e | 2407 | u32 oldseq; |
1da177e4 LT |
2408 | /* Fragment `seq' is missing. If it is after |
2409 | minseq, it might arrive later, so stop here. */ | |
2410 | if (seq_after(seq, minseq)) | |
2411 | break; | |
2412 | /* Fragment `seq' is lost, keep going. */ | |
2413 | lost = 1; | |
8a49ad6e | 2414 | oldseq = seq; |
a00eac0c DM |
2415 | seq = seq_before(minseq, PPP_MP_CB(p)->sequence)? |
2416 | minseq + 1: PPP_MP_CB(p)->sequence; | |
8a49ad6e BM |
2417 | |
2418 | if (ppp->debug & 1) | |
2419 | netdev_printk(KERN_DEBUG, ppp->dev, | |
2420 | "lost frag %u..%u\n", | |
2421 | oldseq, seq-1); | |
2422 | ||
d52344a7 | 2423 | goto again; |
1da177e4 LT |
2424 | } |
2425 | ||
2426 | /* | |
2427 | * At this point we know that all the fragments from | |
2428 | * ppp->nextseq to seq are either present or lost. | |
2429 | * Also, there are no complete packets in the queue | |
2430 | * that have no missing fragments and end before this | |
2431 | * fragment. | |
2432 | */ | |
2433 | ||
2434 | /* B bit set indicates this fragment starts a packet */ | |
a00eac0c | 2435 | if (PPP_MP_CB(p)->BEbits & B) { |
1da177e4 LT |
2436 | head = p; |
2437 | lost = 0; | |
2438 | len = 0; | |
2439 | } | |
2440 | ||
2441 | len += p->len; | |
2442 | ||
2443 | /* Got a complete packet yet? */ | |
a00eac0c DM |
2444 | if (lost == 0 && (PPP_MP_CB(p)->BEbits & E) && |
2445 | (PPP_MP_CB(head)->BEbits & B)) { | |
1da177e4 | 2446 | if (len > ppp->mrru + 2) { |
8c0469cd | 2447 | ++ppp->dev->stats.rx_length_errors; |
b48f8c23 DM |
2448 | netdev_printk(KERN_DEBUG, ppp->dev, |
2449 | "PPP: reconstructed packet" | |
2450 | " is too long (%d)\n", len); | |
1da177e4 LT |
2451 | } else { |
2452 | tail = p; | |
2453 | break; | |
2454 | } | |
2455 | ppp->nextseq = seq + 1; | |
2456 | } | |
2457 | ||
2458 | /* | |
2459 | * If this is the ending fragment of a packet, | |
2460 | * and we haven't found a complete valid packet yet, | |
2461 | * we can discard up to and including this fragment. | |
2462 | */ | |
d52344a7 DM |
2463 | if (PPP_MP_CB(p)->BEbits & E) { |
2464 | struct sk_buff *tmp2; | |
1da177e4 | 2465 | |
d52344a7 | 2466 | skb_queue_reverse_walk_from_safe(list, p, tmp2) { |
8a49ad6e BM |
2467 | if (ppp->debug & 1) |
2468 | netdev_printk(KERN_DEBUG, ppp->dev, | |
2469 | "discarding frag %u\n", | |
2470 | PPP_MP_CB(p)->sequence); | |
d52344a7 DM |
2471 | __skb_unlink(p, list); |
2472 | kfree_skb(p); | |
2473 | } | |
2474 | head = skb_peek(list); | |
2475 | if (!head) | |
2476 | break; | |
2477 | } | |
1da177e4 LT |
2478 | ++seq; |
2479 | } | |
2480 | ||
2481 | /* If we have a complete packet, copy it all into one skb. */ | |
2482 | if (tail != NULL) { | |
2483 | /* If we have discarded any fragments, | |
2484 | signal a receive error. */ | |
a00eac0c | 2485 | if (PPP_MP_CB(head)->sequence != ppp->nextseq) { |
8a49ad6e BM |
2486 | skb_queue_walk_safe(list, p, tmp) { |
2487 | if (p == head) | |
2488 | break; | |
2489 | if (ppp->debug & 1) | |
2490 | netdev_printk(KERN_DEBUG, ppp->dev, | |
2491 | "discarding frag %u\n", | |
2492 | PPP_MP_CB(p)->sequence); | |
2493 | __skb_unlink(p, list); | |
2494 | kfree_skb(p); | |
2495 | } | |
2496 | ||
1da177e4 | 2497 | if (ppp->debug & 1) |
b48f8c23 DM |
2498 | netdev_printk(KERN_DEBUG, ppp->dev, |
2499 | " missed pkts %u..%u\n", | |
2500 | ppp->nextseq, | |
2501 | PPP_MP_CB(head)->sequence-1); | |
8c0469cd | 2502 | ++ppp->dev->stats.rx_dropped; |
1da177e4 LT |
2503 | ppp_receive_error(ppp); |
2504 | } | |
2505 | ||
212bfb9e DM |
2506 | skb = head; |
2507 | if (head != tail) { | |
2508 | struct sk_buff **fragpp = &skb_shinfo(skb)->frag_list; | |
2509 | p = skb_queue_next(list, head); | |
2510 | __skb_unlink(skb, list); | |
2511 | skb_queue_walk_from_safe(list, p, tmp) { | |
2512 | __skb_unlink(p, list); | |
2513 | *fragpp = p; | |
2514 | p->next = NULL; | |
2515 | fragpp = &p->next; | |
2516 | ||
2517 | skb->len += p->len; | |
2518 | skb->data_len += p->len; | |
19c6c8f5 | 2519 | skb->truesize += p->truesize; |
212bfb9e DM |
2520 | |
2521 | if (p == tail) | |
2522 | break; | |
2523 | } | |
2524 | } else { | |
2525 | __skb_unlink(skb, list); | |
2526 | } | |
2527 | ||
a00eac0c | 2528 | ppp->nextseq = PPP_MP_CB(tail)->sequence + 1; |
1da177e4 LT |
2529 | } |
2530 | ||
2531 | return skb; | |
2532 | } | |
2533 | #endif /* CONFIG_PPP_MULTILINK */ | |
2534 | ||
2535 | /* | |
2536 | * Channel interface. | |
2537 | */ | |
2538 | ||
273ec51d CG |
2539 | /* Create a new, unattached ppp channel. */ |
2540 | int ppp_register_channel(struct ppp_channel *chan) | |
2541 | { | |
2542 | return ppp_register_net_channel(current->nsproxy->net_ns, chan); | |
2543 | } | |
2544 | ||
2545 | /* Create a new, unattached ppp channel for specified net. */ | |
2546 | int ppp_register_net_channel(struct net *net, struct ppp_channel *chan) | |
1da177e4 LT |
2547 | { |
2548 | struct channel *pch; | |
273ec51d | 2549 | struct ppp_net *pn; |
1da177e4 | 2550 | |
d4274b51 | 2551 | pch = kzalloc(sizeof(struct channel), GFP_KERNEL); |
cd228d54 | 2552 | if (!pch) |
1da177e4 | 2553 | return -ENOMEM; |
273ec51d CG |
2554 | |
2555 | pn = ppp_pernet(net); | |
2556 | ||
1da177e4 LT |
2557 | pch->ppp = NULL; |
2558 | pch->chan = chan; | |
1f461dcd | 2559 | pch->chan_net = get_net(net); |
1da177e4 LT |
2560 | chan->ppp = pch; |
2561 | init_ppp_file(&pch->file, CHANNEL); | |
2562 | pch->file.hdrlen = chan->hdrlen; | |
2563 | #ifdef CONFIG_PPP_MULTILINK | |
2564 | pch->lastseq = -1; | |
2565 | #endif /* CONFIG_PPP_MULTILINK */ | |
2566 | init_rwsem(&pch->chan_sem); | |
2567 | spin_lock_init(&pch->downl); | |
2568 | rwlock_init(&pch->upl); | |
273ec51d CG |
2569 | |
2570 | spin_lock_bh(&pn->all_channels_lock); | |
2571 | pch->file.index = ++pn->last_channel_index; | |
2572 | list_add(&pch->list, &pn->new_channels); | |
1da177e4 | 2573 | atomic_inc(&channel_count); |
273ec51d CG |
2574 | spin_unlock_bh(&pn->all_channels_lock); |
2575 | ||
1da177e4 LT |
2576 | return 0; |
2577 | } | |
2578 | ||
2579 | /* | |
2580 | * Return the index of a channel. | |
2581 | */ | |
2582 | int ppp_channel_index(struct ppp_channel *chan) | |
2583 | { | |
2584 | struct channel *pch = chan->ppp; | |
2585 | ||
cd228d54 | 2586 | if (pch) |
1da177e4 LT |
2587 | return pch->file.index; |
2588 | return -1; | |
2589 | } | |
2590 | ||
2591 | /* | |
2592 | * Return the PPP unit number to which a channel is connected. | |
2593 | */ | |
2594 | int ppp_unit_number(struct ppp_channel *chan) | |
2595 | { | |
2596 | struct channel *pch = chan->ppp; | |
2597 | int unit = -1; | |
2598 | ||
cd228d54 | 2599 | if (pch) { |
1da177e4 | 2600 | read_lock_bh(&pch->upl); |
cd228d54 | 2601 | if (pch->ppp) |
1da177e4 LT |
2602 | unit = pch->ppp->file.index; |
2603 | read_unlock_bh(&pch->upl); | |
2604 | } | |
2605 | return unit; | |
2606 | } | |
2607 | ||
63f96072 JC |
2608 | /* |
2609 | * Return the PPP device interface name of a channel. | |
2610 | */ | |
2611 | char *ppp_dev_name(struct ppp_channel *chan) | |
2612 | { | |
2613 | struct channel *pch = chan->ppp; | |
2614 | char *name = NULL; | |
2615 | ||
2616 | if (pch) { | |
2617 | read_lock_bh(&pch->upl); | |
2618 | if (pch->ppp && pch->ppp->dev) | |
2619 | name = pch->ppp->dev->name; | |
2620 | read_unlock_bh(&pch->upl); | |
2621 | } | |
2622 | return name; | |
2623 | } | |
2624 | ||
2625 | ||
1da177e4 LT |
2626 | /* |
2627 | * Disconnect a channel from the generic layer. | |
2628 | * This must be called in process context. | |
2629 | */ | |
2630 | void | |
2631 | ppp_unregister_channel(struct ppp_channel *chan) | |
2632 | { | |
2633 | struct channel *pch = chan->ppp; | |
273ec51d | 2634 | struct ppp_net *pn; |
1da177e4 | 2635 | |
cd228d54 | 2636 | if (!pch) |
1da177e4 | 2637 | return; /* should never happen */ |
273ec51d | 2638 | |
1da177e4 LT |
2639 | chan->ppp = NULL; |
2640 | ||
2641 | /* | |
2642 | * This ensures that we have returned from any calls into the | |
2643 | * the channel's start_xmit or ioctl routine before we proceed. | |
2644 | */ | |
2645 | down_write(&pch->chan_sem); | |
2646 | spin_lock_bh(&pch->downl); | |
2647 | pch->chan = NULL; | |
2648 | spin_unlock_bh(&pch->downl); | |
2649 | up_write(&pch->chan_sem); | |
2650 | ppp_disconnect_channel(pch); | |
273ec51d CG |
2651 | |
2652 | pn = ppp_pernet(pch->chan_net); | |
2653 | spin_lock_bh(&pn->all_channels_lock); | |
1da177e4 | 2654 | list_del(&pch->list); |
273ec51d CG |
2655 | spin_unlock_bh(&pn->all_channels_lock); |
2656 | ||
1da177e4 LT |
2657 | pch->file.dead = 1; |
2658 | wake_up_interruptible(&pch->file.rwait); | |
2659 | if (atomic_dec_and_test(&pch->file.refcnt)) | |
2660 | ppp_destroy_channel(pch); | |
2661 | } | |
2662 | ||
2663 | /* | |
2664 | * Callback from a channel when it can accept more to transmit. | |
2665 | * This should be called at BH/softirq level, not interrupt level. | |
2666 | */ | |
2667 | void | |
2668 | ppp_output_wakeup(struct ppp_channel *chan) | |
2669 | { | |
2670 | struct channel *pch = chan->ppp; | |
2671 | ||
cd228d54 | 2672 | if (!pch) |
1da177e4 LT |
2673 | return; |
2674 | ppp_channel_push(pch); | |
2675 | } | |
2676 | ||
2677 | /* | |
2678 | * Compression control. | |
2679 | */ | |
2680 | ||
2681 | /* Process the PPPIOCSCOMPRESS ioctl. */ | |
2682 | static int | |
2683 | ppp_set_compress(struct ppp *ppp, unsigned long arg) | |
2684 | { | |
2685 | int err; | |
2686 | struct compressor *cp, *ocomp; | |
2687 | struct ppp_option_data data; | |
2688 | void *state, *ostate; | |
2689 | unsigned char ccp_option[CCP_MAX_OPTION_LENGTH]; | |
2690 | ||
2691 | err = -EFAULT; | |
555d5b70 | 2692 | if (copy_from_user(&data, (void __user *) arg, sizeof(data))) |
1da177e4 | 2693 | goto out; |
555d5b70 GN |
2694 | if (data.length > CCP_MAX_OPTION_LENGTH) |
2695 | goto out; | |
2696 | if (copy_from_user(ccp_option, (void __user *) data.ptr, data.length)) | |
2697 | goto out; | |
2698 | ||
1da177e4 | 2699 | err = -EINVAL; |
555d5b70 | 2700 | if (data.length < 2 || ccp_option[1] < 2 || ccp_option[1] > data.length) |
1da177e4 LT |
2701 | goto out; |
2702 | ||
a65e5d78 JB |
2703 | cp = try_then_request_module( |
2704 | find_compressor(ccp_option[0]), | |
2705 | "ppp-compress-%d", ccp_option[0]); | |
cd228d54 | 2706 | if (!cp) |
1da177e4 LT |
2707 | goto out; |
2708 | ||
2709 | err = -ENOBUFS; | |
2710 | if (data.transmit) { | |
2711 | state = cp->comp_alloc(ccp_option, data.length); | |
cd228d54 | 2712 | if (state) { |
1da177e4 LT |
2713 | ppp_xmit_lock(ppp); |
2714 | ppp->xstate &= ~SC_COMP_RUN; | |
2715 | ocomp = ppp->xcomp; | |
2716 | ostate = ppp->xc_state; | |
2717 | ppp->xcomp = cp; | |
2718 | ppp->xc_state = state; | |
2719 | ppp_xmit_unlock(ppp); | |
cd228d54 | 2720 | if (ostate) { |
1da177e4 LT |
2721 | ocomp->comp_free(ostate); |
2722 | module_put(ocomp->owner); | |
2723 | } | |
2724 | err = 0; | |
2725 | } else | |
2726 | module_put(cp->owner); | |
2727 | ||
2728 | } else { | |
2729 | state = cp->decomp_alloc(ccp_option, data.length); | |
cd228d54 | 2730 | if (state) { |
1da177e4 LT |
2731 | ppp_recv_lock(ppp); |
2732 | ppp->rstate &= ~SC_DECOMP_RUN; | |
2733 | ocomp = ppp->rcomp; | |
2734 | ostate = ppp->rc_state; | |
2735 | ppp->rcomp = cp; | |
2736 | ppp->rc_state = state; | |
2737 | ppp_recv_unlock(ppp); | |
cd228d54 | 2738 | if (ostate) { |
1da177e4 LT |
2739 | ocomp->decomp_free(ostate); |
2740 | module_put(ocomp->owner); | |
2741 | } | |
2742 | err = 0; | |
2743 | } else | |
2744 | module_put(cp->owner); | |
2745 | } | |
2746 | ||
2747 | out: | |
2748 | return err; | |
2749 | } | |
2750 | ||
2751 | /* | |
2752 | * Look at a CCP packet and update our state accordingly. | |
2753 | * We assume the caller has the xmit or recv path locked. | |
2754 | */ | |
2755 | static void | |
2756 | ppp_ccp_peek(struct ppp *ppp, struct sk_buff *skb, int inbound) | |
2757 | { | |
2758 | unsigned char *dp; | |
2759 | int len; | |
2760 | ||
2761 | if (!pskb_may_pull(skb, CCP_HDRLEN + 2)) | |
2762 | return; /* no header */ | |
2763 | dp = skb->data + 2; | |
2764 | ||
2765 | switch (CCP_CODE(dp)) { | |
2766 | case CCP_CONFREQ: | |
2767 | ||
6aa20a22 | 2768 | /* A ConfReq starts negotiation of compression |
1da177e4 LT |
2769 | * in one direction of transmission, |
2770 | * and hence brings it down...but which way? | |
2771 | * | |
2772 | * Remember: | |
2773 | * A ConfReq indicates what the sender would like to receive | |
2774 | */ | |
2775 | if(inbound) | |
2776 | /* He is proposing what I should send */ | |
2777 | ppp->xstate &= ~SC_COMP_RUN; | |
6aa20a22 | 2778 | else |
1da177e4 LT |
2779 | /* I am proposing to what he should send */ |
2780 | ppp->rstate &= ~SC_DECOMP_RUN; | |
6aa20a22 | 2781 | |
1da177e4 | 2782 | break; |
6aa20a22 | 2783 | |
1da177e4 LT |
2784 | case CCP_TERMREQ: |
2785 | case CCP_TERMACK: | |
2786 | /* | |
6aa20a22 | 2787 | * CCP is going down, both directions of transmission |
1da177e4 LT |
2788 | */ |
2789 | ppp->rstate &= ~SC_DECOMP_RUN; | |
2790 | ppp->xstate &= ~SC_COMP_RUN; | |
2791 | break; | |
2792 | ||
2793 | case CCP_CONFACK: | |
2794 | if ((ppp->flags & (SC_CCP_OPEN | SC_CCP_UP)) != SC_CCP_OPEN) | |
2795 | break; | |
2796 | len = CCP_LENGTH(dp); | |
2797 | if (!pskb_may_pull(skb, len + 2)) | |
2798 | return; /* too short */ | |
2799 | dp += CCP_HDRLEN; | |
2800 | len -= CCP_HDRLEN; | |
2801 | if (len < CCP_OPT_MINLEN || len < CCP_OPT_LENGTH(dp)) | |
2802 | break; | |
2803 | if (inbound) { | |
2804 | /* we will start receiving compressed packets */ | |
cd228d54 | 2805 | if (!ppp->rc_state) |
1da177e4 LT |
2806 | break; |
2807 | if (ppp->rcomp->decomp_init(ppp->rc_state, dp, len, | |
2808 | ppp->file.index, 0, ppp->mru, ppp->debug)) { | |
2809 | ppp->rstate |= SC_DECOMP_RUN; | |
2810 | ppp->rstate &= ~(SC_DC_ERROR | SC_DC_FERROR); | |
2811 | } | |
2812 | } else { | |
2813 | /* we will soon start sending compressed packets */ | |
cd228d54 | 2814 | if (!ppp->xc_state) |
1da177e4 LT |
2815 | break; |
2816 | if (ppp->xcomp->comp_init(ppp->xc_state, dp, len, | |
2817 | ppp->file.index, 0, ppp->debug)) | |
2818 | ppp->xstate |= SC_COMP_RUN; | |
2819 | } | |
2820 | break; | |
2821 | ||
2822 | case CCP_RESETACK: | |
2823 | /* reset the [de]compressor */ | |
2824 | if ((ppp->flags & SC_CCP_UP) == 0) | |
2825 | break; | |
2826 | if (inbound) { | |
2827 | if (ppp->rc_state && (ppp->rstate & SC_DECOMP_RUN)) { | |
2828 | ppp->rcomp->decomp_reset(ppp->rc_state); | |
2829 | ppp->rstate &= ~SC_DC_ERROR; | |
2830 | } | |
2831 | } else { | |
2832 | if (ppp->xc_state && (ppp->xstate & SC_COMP_RUN)) | |
2833 | ppp->xcomp->comp_reset(ppp->xc_state); | |
2834 | } | |
2835 | break; | |
2836 | } | |
2837 | } | |
2838 | ||
2839 | /* Free up compression resources. */ | |
2840 | static void | |
2841 | ppp_ccp_closed(struct ppp *ppp) | |
2842 | { | |
2843 | void *xstate, *rstate; | |
2844 | struct compressor *xcomp, *rcomp; | |
2845 | ||
2846 | ppp_lock(ppp); | |
2847 | ppp->flags &= ~(SC_CCP_OPEN | SC_CCP_UP); | |
2848 | ppp->xstate = 0; | |
2849 | xcomp = ppp->xcomp; | |
2850 | xstate = ppp->xc_state; | |
2851 | ppp->xc_state = NULL; | |
2852 | ppp->rstate = 0; | |
2853 | rcomp = ppp->rcomp; | |
2854 | rstate = ppp->rc_state; | |
2855 | ppp->rc_state = NULL; | |
2856 | ppp_unlock(ppp); | |
2857 | ||
2858 | if (xstate) { | |
2859 | xcomp->comp_free(xstate); | |
2860 | module_put(xcomp->owner); | |
2861 | } | |
2862 | if (rstate) { | |
2863 | rcomp->decomp_free(rstate); | |
2864 | module_put(rcomp->owner); | |
2865 | } | |
2866 | } | |
2867 | ||
2868 | /* List of compressors. */ | |
2869 | static LIST_HEAD(compressor_list); | |
2870 | static DEFINE_SPINLOCK(compressor_list_lock); | |
2871 | ||
2872 | struct compressor_entry { | |
2873 | struct list_head list; | |
2874 | struct compressor *comp; | |
2875 | }; | |
2876 | ||
2877 | static struct compressor_entry * | |
2878 | find_comp_entry(int proto) | |
2879 | { | |
2880 | struct compressor_entry *ce; | |
1da177e4 | 2881 | |
81616c5a | 2882 | list_for_each_entry(ce, &compressor_list, list) { |
1da177e4 LT |
2883 | if (ce->comp->compress_proto == proto) |
2884 | return ce; | |
2885 | } | |
2886 | return NULL; | |
2887 | } | |
2888 | ||
2889 | /* Register a compressor */ | |
2890 | int | |
2891 | ppp_register_compressor(struct compressor *cp) | |
2892 | { | |
2893 | struct compressor_entry *ce; | |
2894 | int ret; | |
2895 | spin_lock(&compressor_list_lock); | |
2896 | ret = -EEXIST; | |
cd228d54 | 2897 | if (find_comp_entry(cp->compress_proto)) |
1da177e4 LT |
2898 | goto out; |
2899 | ret = -ENOMEM; | |
2900 | ce = kmalloc(sizeof(struct compressor_entry), GFP_ATOMIC); | |
cd228d54 | 2901 | if (!ce) |
1da177e4 LT |
2902 | goto out; |
2903 | ret = 0; | |
2904 | ce->comp = cp; | |
2905 | list_add(&ce->list, &compressor_list); | |
2906 | out: | |
2907 | spin_unlock(&compressor_list_lock); | |
2908 | return ret; | |
2909 | } | |
2910 | ||
2911 | /* Unregister a compressor */ | |
2912 | void | |
2913 | ppp_unregister_compressor(struct compressor *cp) | |
2914 | { | |
2915 | struct compressor_entry *ce; | |
2916 | ||
2917 | spin_lock(&compressor_list_lock); | |
2918 | ce = find_comp_entry(cp->compress_proto); | |
cd228d54 | 2919 | if (ce && ce->comp == cp) { |
1da177e4 LT |
2920 | list_del(&ce->list); |
2921 | kfree(ce); | |
2922 | } | |
2923 | spin_unlock(&compressor_list_lock); | |
2924 | } | |
2925 | ||
2926 | /* Find a compressor. */ | |
2927 | static struct compressor * | |
2928 | find_compressor(int type) | |
2929 | { | |
2930 | struct compressor_entry *ce; | |
2931 | struct compressor *cp = NULL; | |
2932 | ||
2933 | spin_lock(&compressor_list_lock); | |
2934 | ce = find_comp_entry(type); | |
cd228d54 | 2935 | if (ce) { |
1da177e4 LT |
2936 | cp = ce->comp; |
2937 | if (!try_module_get(cp->owner)) | |
2938 | cp = NULL; | |
2939 | } | |
2940 | spin_unlock(&compressor_list_lock); | |
2941 | return cp; | |
2942 | } | |
2943 | ||
2944 | /* | |
2945 | * Miscelleneous stuff. | |
2946 | */ | |
2947 | ||
2948 | static void | |
2949 | ppp_get_stats(struct ppp *ppp, struct ppp_stats *st) | |
2950 | { | |
2951 | struct slcompress *vj = ppp->vj; | |
2952 | ||
2953 | memset(st, 0, sizeof(*st)); | |
e51f6ff3 | 2954 | st->p.ppp_ipackets = ppp->stats64.rx_packets; |
8c0469cd | 2955 | st->p.ppp_ierrors = ppp->dev->stats.rx_errors; |
e51f6ff3 KG |
2956 | st->p.ppp_ibytes = ppp->stats64.rx_bytes; |
2957 | st->p.ppp_opackets = ppp->stats64.tx_packets; | |
8c0469cd | 2958 | st->p.ppp_oerrors = ppp->dev->stats.tx_errors; |
e51f6ff3 | 2959 | st->p.ppp_obytes = ppp->stats64.tx_bytes; |
cd228d54 | 2960 | if (!vj) |
1da177e4 LT |
2961 | return; |
2962 | st->vj.vjs_packets = vj->sls_o_compressed + vj->sls_o_uncompressed; | |
2963 | st->vj.vjs_compressed = vj->sls_o_compressed; | |
2964 | st->vj.vjs_searches = vj->sls_o_searches; | |
2965 | st->vj.vjs_misses = vj->sls_o_misses; | |
2966 | st->vj.vjs_errorin = vj->sls_i_error; | |
2967 | st->vj.vjs_tossed = vj->sls_i_tossed; | |
2968 | st->vj.vjs_uncompressedin = vj->sls_i_uncompressed; | |
2969 | st->vj.vjs_compressedin = vj->sls_i_compressed; | |
2970 | } | |
2971 | ||
2972 | /* | |
2973 | * Stuff for handling the lists of ppp units and channels | |
2974 | * and for initialization. | |
2975 | */ | |
2976 | ||
2977 | /* | |
2978 | * Create a new ppp interface unit. Fails if it can't allocate memory | |
2979 | * or if there is already a unit with the requested number. | |
2980 | * unit == -1 means allocate a new number. | |
2981 | */ | |
7d9f0b48 | 2982 | static int ppp_create_interface(struct net *net, struct file *file, int *unit) |
1da177e4 | 2983 | { |
7d9f0b48 GN |
2984 | struct ppp_config conf = { |
2985 | .file = file, | |
2986 | .unit = *unit, | |
96d934c7 | 2987 | .ifname_is_set = false, |
7d9f0b48 GN |
2988 | }; |
2989 | struct net_device *dev; | |
1da177e4 | 2990 | struct ppp *ppp; |
7d9f0b48 | 2991 | int err; |
1da177e4 | 2992 | |
69d9728d | 2993 | dev = alloc_netdev(sizeof(struct ppp), "", NET_NAME_ENUM, ppp_setup); |
7d9f0b48 GN |
2994 | if (!dev) { |
2995 | err = -ENOMEM; | |
2996 | goto err; | |
2997 | } | |
273ec51d | 2998 | dev_net_set(dev, net); |
96d934c7 | 2999 | dev->rtnl_link_ops = &ppp_link_ops; |
273ec51d | 3000 | |
58a89eca | 3001 | rtnl_lock(); |
1da177e4 | 3002 | |
7d9f0b48 GN |
3003 | err = ppp_dev_configure(net, dev, &conf); |
3004 | if (err < 0) | |
3005 | goto err_dev; | |
3006 | ppp = netdev_priv(dev); | |
3007 | *unit = ppp->file.index; | |
273ec51d | 3008 | |
58a89eca | 3009 | rtnl_unlock(); |
7a95d267 | 3010 | |
7d9f0b48 | 3011 | return 0; |
1da177e4 | 3012 | |
7d9f0b48 | 3013 | err_dev: |
6faac63a | 3014 | rtnl_unlock(); |
1da177e4 | 3015 | free_netdev(dev); |
7d9f0b48 GN |
3016 | err: |
3017 | return err; | |
1da177e4 LT |
3018 | } |
3019 | ||
3020 | /* | |
3021 | * Initialize a ppp_file structure. | |
3022 | */ | |
3023 | static void | |
3024 | init_ppp_file(struct ppp_file *pf, int kind) | |
3025 | { | |
3026 | pf->kind = kind; | |
3027 | skb_queue_head_init(&pf->xq); | |
3028 | skb_queue_head_init(&pf->rq); | |
3029 | atomic_set(&pf->refcnt, 1); | |
3030 | init_waitqueue_head(&pf->rwait); | |
3031 | } | |
3032 | ||
1da177e4 LT |
3033 | /* |
3034 | * Free the memory used by a ppp unit. This is only called once | |
3035 | * there are no channels connected to the unit and no file structs | |
3036 | * that reference the unit. | |
3037 | */ | |
3038 | static void ppp_destroy_interface(struct ppp *ppp) | |
3039 | { | |
3040 | atomic_dec(&ppp_unit_count); | |
3041 | ||
3042 | if (!ppp->file.dead || ppp->n_channels) { | |
3043 | /* "can't happen" */ | |
b48f8c23 DM |
3044 | netdev_err(ppp->dev, "ppp: destroying ppp struct %p " |
3045 | "but dead=%d n_channels=%d !\n", | |
3046 | ppp, ppp->file.dead, ppp->n_channels); | |
1da177e4 LT |
3047 | return; |
3048 | } | |
3049 | ||
3050 | ppp_ccp_closed(ppp); | |
3051 | if (ppp->vj) { | |
3052 | slhc_free(ppp->vj); | |
3053 | ppp->vj = NULL; | |
3054 | } | |
3055 | skb_queue_purge(&ppp->file.xq); | |
3056 | skb_queue_purge(&ppp->file.rq); | |
3057 | #ifdef CONFIG_PPP_MULTILINK | |
3058 | skb_queue_purge(&ppp->mrq); | |
3059 | #endif /* CONFIG_PPP_MULTILINK */ | |
3060 | #ifdef CONFIG_PPP_FILTER | |
568f194e | 3061 | if (ppp->pass_filter) { |
7ae457c1 | 3062 | bpf_prog_destroy(ppp->pass_filter); |
568f194e DB |
3063 | ppp->pass_filter = NULL; |
3064 | } | |
3065 | ||
3066 | if (ppp->active_filter) { | |
7ae457c1 | 3067 | bpf_prog_destroy(ppp->active_filter); |
568f194e DB |
3068 | ppp->active_filter = NULL; |
3069 | } | |
1da177e4 LT |
3070 | #endif /* CONFIG_PPP_FILTER */ |
3071 | ||
1d2f8c95 | 3072 | kfree_skb(ppp->xmit_pending); |
e5dadc65 | 3073 | free_percpu(ppp->xmit_recursion); |
165de5b7 | 3074 | |
739840d5 | 3075 | free_netdev(ppp->dev); |
1da177e4 LT |
3076 | } |
3077 | ||
3078 | /* | |
3079 | * Locate an existing ppp unit. | |
8ed965d6 | 3080 | * The caller should have locked the all_ppp_mutex. |
1da177e4 LT |
3081 | */ |
3082 | static struct ppp * | |
273ec51d | 3083 | ppp_find_unit(struct ppp_net *pn, int unit) |
1da177e4 | 3084 | { |
273ec51d | 3085 | return unit_find(&pn->units_idr, unit); |
1da177e4 LT |
3086 | } |
3087 | ||
3088 | /* | |
3089 | * Locate an existing ppp channel. | |
3090 | * The caller should have locked the all_channels_lock. | |
3091 | * First we look in the new_channels list, then in the | |
3092 | * all_channels list. If found in the new_channels list, | |
3093 | * we move it to the all_channels list. This is for speed | |
3094 | * when we have a lot of channels in use. | |
3095 | */ | |
3096 | static struct channel * | |
273ec51d | 3097 | ppp_find_channel(struct ppp_net *pn, int unit) |
1da177e4 LT |
3098 | { |
3099 | struct channel *pch; | |
1da177e4 | 3100 | |
273ec51d | 3101 | list_for_each_entry(pch, &pn->new_channels, list) { |
1da177e4 | 3102 | if (pch->file.index == unit) { |
273ec51d | 3103 | list_move(&pch->list, &pn->all_channels); |
1da177e4 LT |
3104 | return pch; |
3105 | } | |
3106 | } | |
273ec51d CG |
3107 | |
3108 | list_for_each_entry(pch, &pn->all_channels, list) { | |
1da177e4 LT |
3109 | if (pch->file.index == unit) |
3110 | return pch; | |
3111 | } | |
273ec51d | 3112 | |
1da177e4 LT |
3113 | return NULL; |
3114 | } | |
3115 | ||
3116 | /* | |
3117 | * Connect a PPP channel to a PPP interface unit. | |
3118 | */ | |
3119 | static int | |
3120 | ppp_connect_channel(struct channel *pch, int unit) | |
3121 | { | |
3122 | struct ppp *ppp; | |
273ec51d | 3123 | struct ppp_net *pn; |
1da177e4 LT |
3124 | int ret = -ENXIO; |
3125 | int hdrlen; | |
3126 | ||
273ec51d CG |
3127 | pn = ppp_pernet(pch->chan_net); |
3128 | ||
3129 | mutex_lock(&pn->all_ppp_mutex); | |
3130 | ppp = ppp_find_unit(pn, unit); | |
cd228d54 | 3131 | if (!ppp) |
1da177e4 LT |
3132 | goto out; |
3133 | write_lock_bh(&pch->upl); | |
3134 | ret = -EINVAL; | |
cd228d54 | 3135 | if (pch->ppp) |
1da177e4 LT |
3136 | goto outl; |
3137 | ||
3138 | ppp_lock(ppp); | |
3139 | if (pch->file.hdrlen > ppp->file.hdrlen) | |
3140 | ppp->file.hdrlen = pch->file.hdrlen; | |
3141 | hdrlen = pch->file.hdrlen + 2; /* for protocol bytes */ | |
739840d5 | 3142 | if (hdrlen > ppp->dev->hard_header_len) |
1da177e4 LT |
3143 | ppp->dev->hard_header_len = hdrlen; |
3144 | list_add_tail(&pch->clist, &ppp->channels); | |
3145 | ++ppp->n_channels; | |
3146 | pch->ppp = ppp; | |
3147 | atomic_inc(&ppp->file.refcnt); | |
3148 | ppp_unlock(ppp); | |
3149 | ret = 0; | |
3150 | ||
3151 | outl: | |
3152 | write_unlock_bh(&pch->upl); | |
3153 | out: | |
273ec51d | 3154 | mutex_unlock(&pn->all_ppp_mutex); |
1da177e4 LT |
3155 | return ret; |
3156 | } | |
3157 | ||
3158 | /* | |
3159 | * Disconnect a channel from its ppp unit. | |
3160 | */ | |
3161 | static int | |
3162 | ppp_disconnect_channel(struct channel *pch) | |
3163 | { | |
3164 | struct ppp *ppp; | |
3165 | int err = -EINVAL; | |
3166 | ||
3167 | write_lock_bh(&pch->upl); | |
3168 | ppp = pch->ppp; | |
3169 | pch->ppp = NULL; | |
3170 | write_unlock_bh(&pch->upl); | |
cd228d54 | 3171 | if (ppp) { |
1da177e4 LT |
3172 | /* remove it from the ppp unit's list */ |
3173 | ppp_lock(ppp); | |
3174 | list_del(&pch->clist); | |
3175 | if (--ppp->n_channels == 0) | |
3176 | wake_up_interruptible(&ppp->file.rwait); | |
3177 | ppp_unlock(ppp); | |
3178 | if (atomic_dec_and_test(&ppp->file.refcnt)) | |
3179 | ppp_destroy_interface(ppp); | |
3180 | err = 0; | |
3181 | } | |
3182 | return err; | |
3183 | } | |
3184 | ||
3185 | /* | |
3186 | * Free up the resources used by a ppp channel. | |
3187 | */ | |
3188 | static void ppp_destroy_channel(struct channel *pch) | |
3189 | { | |
205e1e25 WC |
3190 | put_net(pch->chan_net); |
3191 | pch->chan_net = NULL; | |
3192 | ||
1da177e4 LT |
3193 | atomic_dec(&channel_count); |
3194 | ||
3195 | if (!pch->file.dead) { | |
3196 | /* "can't happen" */ | |
b48f8c23 | 3197 | pr_err("ppp: destroying undead channel %p !\n", pch); |
1da177e4 LT |
3198 | return; |
3199 | } | |
3200 | skb_queue_purge(&pch->file.xq); | |
3201 | skb_queue_purge(&pch->file.rq); | |
3202 | kfree(pch); | |
3203 | } | |
3204 | ||
3205 | static void __exit ppp_cleanup(void) | |
3206 | { | |
3207 | /* should never happen */ | |
3208 | if (atomic_read(&ppp_unit_count) || atomic_read(&channel_count)) | |
b48f8c23 | 3209 | pr_err("PPP: removing module but units remain!\n"); |
96d934c7 | 3210 | rtnl_link_unregister(&ppp_link_ops); |
68fc4fab | 3211 | unregister_chrdev(PPP_MAJOR, "ppp"); |
9a6a2a5e | 3212 | device_destroy(ppp_class, MKDEV(PPP_MAJOR, 0)); |
56b22935 | 3213 | class_destroy(ppp_class); |
741a6fa2 | 3214 | unregister_pernet_device(&ppp_net_ops); |
1da177e4 LT |
3215 | } |
3216 | ||
3217 | /* | |
7a95d267 CG |
3218 | * Units handling. Caller must protect concurrent access |
3219 | * by holding all_ppp_mutex | |
1da177e4 | 3220 | */ |
7a95d267 | 3221 | |
bcc70bb3 CG |
3222 | /* associate pointer with specified number */ |
3223 | static int unit_set(struct idr *p, void *ptr, int n) | |
3224 | { | |
3225 | int unit; | |
85997576 | 3226 | |
2fa532c5 TH |
3227 | unit = idr_alloc(p, ptr, n, n + 1, GFP_KERNEL); |
3228 | if (unit == -ENOSPC) | |
3229 | unit = -EINVAL; | |
85997576 CG |
3230 | return unit; |
3231 | } | |
3232 | ||
7a95d267 CG |
3233 | /* get new free unit number and associate pointer with it */ |
3234 | static int unit_get(struct idr *p, void *ptr) | |
1da177e4 | 3235 | { |
2fa532c5 | 3236 | return idr_alloc(p, ptr, 0, 0, GFP_KERNEL); |
1da177e4 LT |
3237 | } |
3238 | ||
7a95d267 CG |
3239 | /* put unit number back to a pool */ |
3240 | static void unit_put(struct idr *p, int n) | |
1da177e4 | 3241 | { |
7a95d267 | 3242 | idr_remove(p, n); |
1da177e4 LT |
3243 | } |
3244 | ||
7a95d267 CG |
3245 | /* get pointer associated with the number */ |
3246 | static void *unit_find(struct idr *p, int n) | |
1da177e4 | 3247 | { |
7a95d267 | 3248 | return idr_find(p, n); |
1da177e4 LT |
3249 | } |
3250 | ||
3251 | /* Module/initialization stuff */ | |
3252 | ||
3253 | module_init(ppp_init); | |
3254 | module_exit(ppp_cleanup); | |
3255 | ||
273ec51d | 3256 | EXPORT_SYMBOL(ppp_register_net_channel); |
1da177e4 LT |
3257 | EXPORT_SYMBOL(ppp_register_channel); |
3258 | EXPORT_SYMBOL(ppp_unregister_channel); | |
3259 | EXPORT_SYMBOL(ppp_channel_index); | |
3260 | EXPORT_SYMBOL(ppp_unit_number); | |
63f96072 | 3261 | EXPORT_SYMBOL(ppp_dev_name); |
1da177e4 LT |
3262 | EXPORT_SYMBOL(ppp_input); |
3263 | EXPORT_SYMBOL(ppp_input_error); | |
3264 | EXPORT_SYMBOL(ppp_output_wakeup); | |
3265 | EXPORT_SYMBOL(ppp_register_compressor); | |
3266 | EXPORT_SYMBOL(ppp_unregister_compressor); | |
3267 | MODULE_LICENSE("GPL"); | |
578454ff | 3268 | MODULE_ALIAS_CHARDEV(PPP_MAJOR, 0); |
96d934c7 | 3269 | MODULE_ALIAS_RTNL_LINK("ppp"); |
578454ff | 3270 | MODULE_ALIAS("devname:ppp"); |