Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Generic PPP layer for Linux. | |
3 | * | |
4 | * Copyright 1999-2002 Paul Mackerras. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * The generic PPP layer handles the PPP network interfaces, the | |
12 | * /dev/ppp device, packet and VJ compression, and multilink. | |
13 | * It talks to PPP `channels' via the interface defined in | |
14 | * include/linux/ppp_channel.h. Channels provide the basic means for | |
15 | * sending and receiving PPP frames on some kind of communications | |
16 | * channel. | |
17 | * | |
18 | * Part of the code in this driver was inspired by the old async-only | |
19 | * PPP driver, written by Michael Callahan and Al Longyear, and | |
20 | * subsequently hacked by Paul Mackerras. | |
21 | * | |
22 | * ==FILEVERSION 20041108== | |
23 | */ | |
24 | ||
1da177e4 LT |
25 | #include <linux/module.h> |
26 | #include <linux/kernel.h> | |
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> |
d780cd44 | 54 | #include <linux/refcount.h> |
1da177e4 | 55 | |
273ec51d CG |
56 | #include <linux/nsproxy.h> |
57 | #include <net/net_namespace.h> | |
58 | #include <net/netns/generic.h> | |
59 | ||
1da177e4 LT |
60 | #define PPP_VERSION "2.4.2" |
61 | ||
62 | /* | |
63 | * Network protocols we support. | |
64 | */ | |
65 | #define NP_IP 0 /* Internet Protocol V4 */ | |
66 | #define NP_IPV6 1 /* Internet Protocol V6 */ | |
67 | #define NP_IPX 2 /* IPX protocol */ | |
68 | #define NP_AT 3 /* Appletalk protocol */ | |
69 | #define NP_MPLS_UC 4 /* MPLS unicast */ | |
70 | #define NP_MPLS_MC 5 /* MPLS multicast */ | |
71 | #define NUM_NP 6 /* Number of NPs. */ | |
72 | ||
73 | #define MPHDRLEN 6 /* multilink protocol header length */ | |
74 | #define MPHDRLEN_SSN 4 /* ditto with short sequence numbers */ | |
1da177e4 LT |
75 | |
76 | /* | |
77 | * An instance of /dev/ppp can be associated with either a ppp | |
78 | * interface unit or a ppp channel. In both cases, file->private_data | |
79 | * points to one of these. | |
80 | */ | |
81 | struct ppp_file { | |
82 | enum { | |
83 | INTERFACE=1, CHANNEL | |
84 | } kind; | |
85 | struct sk_buff_head xq; /* pppd transmit queue */ | |
86 | struct sk_buff_head rq; /* receive queue for pppd */ | |
87 | wait_queue_head_t rwait; /* for poll on reading /dev/ppp */ | |
d780cd44 | 88 | refcount_t refcnt; /* # refs (incl /dev/ppp attached) */ |
1da177e4 LT |
89 | int hdrlen; /* space to leave for headers */ |
90 | int index; /* interface unit / channel number */ | |
91 | int dead; /* unit/channel has been shut down */ | |
92 | }; | |
93 | ||
b385a144 | 94 | #define PF_TO_X(pf, X) container_of(pf, X, file) |
1da177e4 LT |
95 | |
96 | #define PF_TO_PPP(pf) PF_TO_X(pf, struct ppp) | |
97 | #define PF_TO_CHANNEL(pf) PF_TO_X(pf, struct channel) | |
98 | ||
e51f6ff3 KG |
99 | /* |
100 | * Data structure to hold primary network stats for which | |
101 | * we want to use 64 bit storage. Other network stats | |
102 | * are stored in dev->stats of the ppp strucute. | |
103 | */ | |
104 | struct ppp_link_stats { | |
105 | u64 rx_packets; | |
106 | u64 tx_packets; | |
107 | u64 rx_bytes; | |
108 | u64 tx_bytes; | |
109 | }; | |
110 | ||
1da177e4 LT |
111 | /* |
112 | * Data structure describing one ppp unit. | |
113 | * A ppp unit corresponds to a ppp network interface device | |
114 | * and represents a multilink bundle. | |
115 | * It can have 0 or more ppp channels connected to it. | |
116 | */ | |
117 | struct ppp { | |
118 | struct ppp_file file; /* stuff for read/write/poll 0 */ | |
119 | struct file *owner; /* file that owns this unit 48 */ | |
120 | struct list_head channels; /* list of attached channels 4c */ | |
121 | int n_channels; /* how many channels are attached 54 */ | |
122 | spinlock_t rlock; /* lock for receive side 58 */ | |
123 | spinlock_t wlock; /* lock for transmit side 5c */ | |
5a59a3a0 | 124 | int __percpu *xmit_recursion; /* xmit recursion detect */ |
1da177e4 LT |
125 | int mru; /* max receive unit 60 */ |
126 | unsigned int flags; /* control bits 64 */ | |
127 | unsigned int xstate; /* transmit state bits 68 */ | |
128 | unsigned int rstate; /* receive state bits 6c */ | |
129 | int debug; /* debug flags 70 */ | |
130 | struct slcompress *vj; /* state for VJ header compression */ | |
131 | enum NPmode npmode[NUM_NP]; /* what to do with each net proto 78 */ | |
132 | struct sk_buff *xmit_pending; /* a packet ready to go out 88 */ | |
133 | struct compressor *xcomp; /* transmit packet compressor 8c */ | |
134 | void *xc_state; /* its internal state 90 */ | |
135 | struct compressor *rcomp; /* receive decompressor 94 */ | |
136 | void *rc_state; /* its internal state 98 */ | |
137 | unsigned long last_xmit; /* jiffies when last pkt sent 9c */ | |
138 | unsigned long last_recv; /* jiffies when last pkt rcvd a0 */ | |
139 | struct net_device *dev; /* network interface device a4 */ | |
739840d5 | 140 | int closing; /* is device closing down? a8 */ |
1da177e4 LT |
141 | #ifdef CONFIG_PPP_MULTILINK |
142 | int nxchan; /* next channel to send something on */ | |
143 | u32 nxseq; /* next sequence number to send */ | |
144 | int mrru; /* MP: max reconst. receive unit */ | |
145 | u32 nextseq; /* MP: seq no of next packet */ | |
146 | u32 minseq; /* MP: min of most recent seqnos */ | |
147 | struct sk_buff_head mrq; /* MP: receive reconstruction queue */ | |
148 | #endif /* CONFIG_PPP_MULTILINK */ | |
1da177e4 | 149 | #ifdef CONFIG_PPP_FILTER |
7ae457c1 AS |
150 | struct bpf_prog *pass_filter; /* filter for packets to pass */ |
151 | struct bpf_prog *active_filter; /* filter for pkts to reset idle */ | |
1da177e4 | 152 | #endif /* CONFIG_PPP_FILTER */ |
273ec51d | 153 | struct net *ppp_net; /* the net we belong to */ |
e51f6ff3 | 154 | struct ppp_link_stats stats64; /* 64 bit network stats */ |
1da177e4 LT |
155 | }; |
156 | ||
157 | /* | |
158 | * Bits in flags: SC_NO_TCP_CCID, SC_CCP_OPEN, SC_CCP_UP, SC_LOOP_TRAFFIC, | |
b3f9b92a MD |
159 | * SC_MULTILINK, SC_MP_SHORTSEQ, SC_MP_XSHORTSEQ, SC_COMP_TCP, SC_REJ_COMP_TCP, |
160 | * SC_MUST_COMP | |
1da177e4 LT |
161 | * Bits in rstate: SC_DECOMP_RUN, SC_DC_ERROR, SC_DC_FERROR. |
162 | * Bits in xstate: SC_COMP_RUN | |
163 | */ | |
164 | #define SC_FLAG_BITS (SC_NO_TCP_CCID|SC_CCP_OPEN|SC_CCP_UP|SC_LOOP_TRAFFIC \ | |
165 | |SC_MULTILINK|SC_MP_SHORTSEQ|SC_MP_XSHORTSEQ \ | |
b3f9b92a | 166 | |SC_COMP_TCP|SC_REJ_COMP_TCP|SC_MUST_COMP) |
1da177e4 LT |
167 | |
168 | /* | |
169 | * Private data structure for each channel. | |
170 | * This includes the data structure used for multilink. | |
171 | */ | |
172 | struct channel { | |
173 | struct ppp_file file; /* stuff for read/write/poll */ | |
174 | struct list_head list; /* link in all/new_channels list */ | |
175 | struct ppp_channel *chan; /* public channel data structure */ | |
176 | struct rw_semaphore chan_sem; /* protects `chan' during chan ioctl */ | |
177 | spinlock_t downl; /* protects `chan', file.xq dequeue */ | |
178 | struct ppp *ppp; /* ppp unit we're connected to */ | |
273ec51d | 179 | struct net *chan_net; /* the net channel belongs to */ |
1da177e4 LT |
180 | struct list_head clist; /* link in list of channels per unit */ |
181 | rwlock_t upl; /* protects `ppp' */ | |
182 | #ifdef CONFIG_PPP_MULTILINK | |
183 | u8 avail; /* flag used in multilink stuff */ | |
184 | u8 had_frag; /* >= 1 fragments have been sent */ | |
185 | u32 lastseq; /* MP: last sequence # received */ | |
fa44a73c | 186 | int speed; /* speed of the corresponding ppp channel*/ |
1da177e4 LT |
187 | #endif /* CONFIG_PPP_MULTILINK */ |
188 | }; | |
189 | ||
7d9f0b48 GN |
190 | struct ppp_config { |
191 | struct file *file; | |
192 | s32 unit; | |
96d934c7 | 193 | bool ifname_is_set; |
7d9f0b48 GN |
194 | }; |
195 | ||
1da177e4 LT |
196 | /* |
197 | * SMP locking issues: | |
198 | * Both the ppp.rlock and ppp.wlock locks protect the ppp.channels | |
199 | * list and the ppp.n_channels field, you need to take both locks | |
200 | * before you modify them. | |
201 | * The lock ordering is: channel.upl -> ppp.wlock -> ppp.rlock -> | |
202 | * channel.downl. | |
203 | */ | |
204 | ||
15fd0cd9 | 205 | static DEFINE_MUTEX(ppp_mutex); |
1da177e4 | 206 | static atomic_t ppp_unit_count = ATOMIC_INIT(0); |
1da177e4 LT |
207 | static atomic_t channel_count = ATOMIC_INIT(0); |
208 | ||
273ec51d | 209 | /* per-net private data for this module */ |
c7d03a00 | 210 | static unsigned int ppp_net_id __read_mostly; |
273ec51d CG |
211 | struct ppp_net { |
212 | /* units to ppp mapping */ | |
213 | struct idr units_idr; | |
214 | ||
215 | /* | |
216 | * all_ppp_mutex protects the units_idr mapping. | |
217 | * It also ensures that finding a ppp unit in the units_idr | |
218 | * map and updating its file.refcnt field is atomic. | |
219 | */ | |
220 | struct mutex all_ppp_mutex; | |
221 | ||
222 | /* channels */ | |
223 | struct list_head all_channels; | |
224 | struct list_head new_channels; | |
225 | int last_channel_index; | |
226 | ||
227 | /* | |
228 | * all_channels_lock protects all_channels and | |
229 | * last_channel_index, and the atomicity of find | |
230 | * a channel and updating its file.refcnt field. | |
231 | */ | |
232 | spinlock_t all_channels_lock; | |
233 | }; | |
234 | ||
1da177e4 | 235 | /* Get the PPP protocol number from a skb */ |
96545aeb | 236 | #define PPP_PROTO(skb) get_unaligned_be16((skb)->data) |
1da177e4 LT |
237 | |
238 | /* We limit the length of ppp->file.rq to this (arbitrary) value */ | |
239 | #define PPP_MAX_RQLEN 32 | |
240 | ||
241 | /* | |
242 | * Maximum number of multilink fragments queued up. | |
243 | * This has to be large enough to cope with the maximum latency of | |
244 | * the slowest channel relative to the others. Strictly it should | |
245 | * depend on the number of channels and their characteristics. | |
246 | */ | |
247 | #define PPP_MP_MAX_QLEN 128 | |
248 | ||
249 | /* Multilink header bits. */ | |
250 | #define B 0x80 /* this fragment begins a packet */ | |
251 | #define E 0x40 /* this fragment ends a packet */ | |
252 | ||
253 | /* Compare multilink sequence numbers (assumed to be 32 bits wide) */ | |
254 | #define seq_before(a, b) ((s32)((a) - (b)) < 0) | |
255 | #define seq_after(a, b) ((s32)((a) - (b)) > 0) | |
256 | ||
257 | /* Prototypes. */ | |
273ec51d CG |
258 | static int ppp_unattached_ioctl(struct net *net, struct ppp_file *pf, |
259 | struct file *file, unsigned int cmd, unsigned long arg); | |
6d066734 | 260 | static void ppp_xmit_process(struct ppp *ppp, struct sk_buff *skb); |
1da177e4 LT |
261 | static void ppp_send_frame(struct ppp *ppp, struct sk_buff *skb); |
262 | static void ppp_push(struct ppp *ppp); | |
263 | static void ppp_channel_push(struct channel *pch); | |
264 | static void ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, | |
265 | struct channel *pch); | |
266 | static void ppp_receive_error(struct ppp *ppp); | |
267 | static void ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb); | |
268 | static struct sk_buff *ppp_decompress_frame(struct ppp *ppp, | |
269 | struct sk_buff *skb); | |
270 | #ifdef CONFIG_PPP_MULTILINK | |
271 | static void ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, | |
272 | struct channel *pch); | |
273 | static void ppp_mp_insert(struct ppp *ppp, struct sk_buff *skb); | |
274 | static struct sk_buff *ppp_mp_reconstruct(struct ppp *ppp); | |
275 | static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb); | |
276 | #endif /* CONFIG_PPP_MULTILINK */ | |
277 | static int ppp_set_compress(struct ppp *ppp, unsigned long arg); | |
278 | static void ppp_ccp_peek(struct ppp *ppp, struct sk_buff *skb, int inbound); | |
279 | static void ppp_ccp_closed(struct ppp *ppp); | |
280 | static struct compressor *find_compressor(int type); | |
281 | static void ppp_get_stats(struct ppp *ppp, struct ppp_stats *st); | |
7d9f0b48 | 282 | static int ppp_create_interface(struct net *net, struct file *file, int *unit); |
1da177e4 | 283 | static void init_ppp_file(struct ppp_file *pf, int kind); |
1da177e4 | 284 | static void ppp_destroy_interface(struct ppp *ppp); |
273ec51d CG |
285 | static struct ppp *ppp_find_unit(struct ppp_net *pn, int unit); |
286 | static struct channel *ppp_find_channel(struct ppp_net *pn, int unit); | |
1da177e4 LT |
287 | static int ppp_connect_channel(struct channel *pch, int unit); |
288 | static int ppp_disconnect_channel(struct channel *pch); | |
289 | static void ppp_destroy_channel(struct channel *pch); | |
7a95d267 | 290 | static int unit_get(struct idr *p, void *ptr); |
85997576 | 291 | static int unit_set(struct idr *p, void *ptr, int n); |
7a95d267 CG |
292 | static void unit_put(struct idr *p, int n); |
293 | static void *unit_find(struct idr *p, int n); | |
96d934c7 | 294 | static void ppp_setup(struct net_device *dev); |
1da177e4 | 295 | |
79c441ae GN |
296 | static const struct net_device_ops ppp_netdev_ops; |
297 | ||
56b22935 | 298 | static struct class *ppp_class; |
1da177e4 | 299 | |
273ec51d CG |
300 | /* per net-namespace data */ |
301 | static inline struct ppp_net *ppp_pernet(struct net *net) | |
302 | { | |
303 | BUG_ON(!net); | |
304 | ||
305 | return net_generic(net, ppp_net_id); | |
306 | } | |
307 | ||
1da177e4 LT |
308 | /* Translates a PPP protocol number to a NP index (NP == network protocol) */ |
309 | static inline int proto_to_npindex(int proto) | |
310 | { | |
311 | switch (proto) { | |
312 | case PPP_IP: | |
313 | return NP_IP; | |
314 | case PPP_IPV6: | |
315 | return NP_IPV6; | |
316 | case PPP_IPX: | |
317 | return NP_IPX; | |
318 | case PPP_AT: | |
319 | return NP_AT; | |
320 | case PPP_MPLS_UC: | |
321 | return NP_MPLS_UC; | |
322 | case PPP_MPLS_MC: | |
323 | return NP_MPLS_MC; | |
324 | } | |
325 | return -EINVAL; | |
326 | } | |
327 | ||
328 | /* Translates an NP index into a PPP protocol number */ | |
329 | static const int npindex_to_proto[NUM_NP] = { | |
330 | PPP_IP, | |
331 | PPP_IPV6, | |
332 | PPP_IPX, | |
333 | PPP_AT, | |
334 | PPP_MPLS_UC, | |
335 | PPP_MPLS_MC, | |
336 | }; | |
6aa20a22 | 337 | |
1da177e4 LT |
338 | /* Translates an ethertype into an NP index */ |
339 | static inline int ethertype_to_npindex(int ethertype) | |
340 | { | |
341 | switch (ethertype) { | |
342 | case ETH_P_IP: | |
343 | return NP_IP; | |
344 | case ETH_P_IPV6: | |
345 | return NP_IPV6; | |
346 | case ETH_P_IPX: | |
347 | return NP_IPX; | |
348 | case ETH_P_PPPTALK: | |
349 | case ETH_P_ATALK: | |
350 | return NP_AT; | |
351 | case ETH_P_MPLS_UC: | |
352 | return NP_MPLS_UC; | |
353 | case ETH_P_MPLS_MC: | |
354 | return NP_MPLS_MC; | |
355 | } | |
356 | return -1; | |
357 | } | |
358 | ||
359 | /* Translates an NP index into an ethertype */ | |
360 | static const int npindex_to_ethertype[NUM_NP] = { | |
361 | ETH_P_IP, | |
362 | ETH_P_IPV6, | |
363 | ETH_P_IPX, | |
364 | ETH_P_PPPTALK, | |
365 | ETH_P_MPLS_UC, | |
366 | ETH_P_MPLS_MC, | |
367 | }; | |
368 | ||
369 | /* | |
370 | * Locking shorthand. | |
371 | */ | |
372 | #define ppp_xmit_lock(ppp) spin_lock_bh(&(ppp)->wlock) | |
373 | #define ppp_xmit_unlock(ppp) spin_unlock_bh(&(ppp)->wlock) | |
374 | #define ppp_recv_lock(ppp) spin_lock_bh(&(ppp)->rlock) | |
375 | #define ppp_recv_unlock(ppp) spin_unlock_bh(&(ppp)->rlock) | |
376 | #define ppp_lock(ppp) do { ppp_xmit_lock(ppp); \ | |
377 | ppp_recv_lock(ppp); } while (0) | |
378 | #define ppp_unlock(ppp) do { ppp_recv_unlock(ppp); \ | |
379 | ppp_xmit_unlock(ppp); } while (0) | |
380 | ||
381 | /* | |
382 | * /dev/ppp device routines. | |
383 | * The /dev/ppp device is used by pppd to control the ppp unit. | |
384 | * It supports the read, write, ioctl and poll functions. | |
385 | * Open instances of /dev/ppp can be in one of three states: | |
386 | * unattached, attached to a ppp unit, or attached to a ppp channel. | |
387 | */ | |
388 | static int ppp_open(struct inode *inode, struct file *file) | |
389 | { | |
390 | /* | |
391 | * This could (should?) be enforced by the permissions on /dev/ppp. | |
392 | */ | |
90e229ef | 393 | if (!ns_capable(file->f_cred->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
394 | return -EPERM; |
395 | return 0; | |
396 | } | |
397 | ||
f3ff8a4d | 398 | static int ppp_release(struct inode *unused, struct file *file) |
1da177e4 LT |
399 | { |
400 | struct ppp_file *pf = file->private_data; | |
401 | struct ppp *ppp; | |
402 | ||
cd228d54 | 403 | if (pf) { |
1da177e4 LT |
404 | file->private_data = NULL; |
405 | if (pf->kind == INTERFACE) { | |
406 | ppp = PF_TO_PPP(pf); | |
8cb775bc | 407 | rtnl_lock(); |
1da177e4 | 408 | if (file == ppp->owner) |
8cb775bc GN |
409 | unregister_netdevice(ppp->dev); |
410 | rtnl_unlock(); | |
1da177e4 | 411 | } |
d780cd44 | 412 | if (refcount_dec_and_test(&pf->refcnt)) { |
1da177e4 LT |
413 | switch (pf->kind) { |
414 | case INTERFACE: | |
415 | ppp_destroy_interface(PF_TO_PPP(pf)); | |
416 | break; | |
417 | case CHANNEL: | |
418 | ppp_destroy_channel(PF_TO_CHANNEL(pf)); | |
419 | break; | |
420 | } | |
421 | } | |
422 | } | |
423 | return 0; | |
424 | } | |
425 | ||
426 | static ssize_t ppp_read(struct file *file, char __user *buf, | |
427 | size_t count, loff_t *ppos) | |
428 | { | |
429 | struct ppp_file *pf = file->private_data; | |
430 | DECLARE_WAITQUEUE(wait, current); | |
431 | ssize_t ret; | |
432 | struct sk_buff *skb = NULL; | |
19937d04 | 433 | struct iovec iov; |
ba568408 | 434 | struct iov_iter to; |
1da177e4 LT |
435 | |
436 | ret = count; | |
437 | ||
cd228d54 | 438 | if (!pf) |
1da177e4 LT |
439 | return -ENXIO; |
440 | add_wait_queue(&pf->rwait, &wait); | |
441 | for (;;) { | |
442 | set_current_state(TASK_INTERRUPTIBLE); | |
443 | skb = skb_dequeue(&pf->rq); | |
444 | if (skb) | |
445 | break; | |
446 | ret = 0; | |
447 | if (pf->dead) | |
448 | break; | |
449 | if (pf->kind == INTERFACE) { | |
450 | /* | |
451 | * Return 0 (EOF) on an interface that has no | |
452 | * channels connected, unless it is looping | |
453 | * network traffic (demand mode). | |
454 | */ | |
455 | struct ppp *ppp = PF_TO_PPP(pf); | |
edffc217 GN |
456 | |
457 | ppp_recv_lock(ppp); | |
8e95a202 | 458 | if (ppp->n_channels == 0 && |
edffc217 GN |
459 | (ppp->flags & SC_LOOP_TRAFFIC) == 0) { |
460 | ppp_recv_unlock(ppp); | |
1da177e4 | 461 | break; |
edffc217 GN |
462 | } |
463 | ppp_recv_unlock(ppp); | |
1da177e4 LT |
464 | } |
465 | ret = -EAGAIN; | |
466 | if (file->f_flags & O_NONBLOCK) | |
467 | break; | |
468 | ret = -ERESTARTSYS; | |
469 | if (signal_pending(current)) | |
470 | break; | |
471 | schedule(); | |
472 | } | |
473 | set_current_state(TASK_RUNNING); | |
474 | remove_wait_queue(&pf->rwait, &wait); | |
475 | ||
cd228d54 | 476 | if (!skb) |
1da177e4 LT |
477 | goto out; |
478 | ||
479 | ret = -EOVERFLOW; | |
480 | if (skb->len > count) | |
481 | goto outf; | |
482 | ret = -EFAULT; | |
19937d04 SA |
483 | iov.iov_base = buf; |
484 | iov.iov_len = count; | |
ba568408 AV |
485 | iov_iter_init(&to, READ, &iov, 1, count); |
486 | if (skb_copy_datagram_iter(skb, 0, &to, skb->len)) | |
1da177e4 LT |
487 | goto outf; |
488 | ret = skb->len; | |
489 | ||
490 | outf: | |
491 | kfree_skb(skb); | |
492 | out: | |
493 | return ret; | |
494 | } | |
495 | ||
496 | static ssize_t ppp_write(struct file *file, const char __user *buf, | |
497 | size_t count, loff_t *ppos) | |
498 | { | |
499 | struct ppp_file *pf = file->private_data; | |
500 | struct sk_buff *skb; | |
501 | ssize_t ret; | |
502 | ||
cd228d54 | 503 | if (!pf) |
1da177e4 LT |
504 | return -ENXIO; |
505 | ret = -ENOMEM; | |
506 | skb = alloc_skb(count + pf->hdrlen, GFP_KERNEL); | |
cd228d54 | 507 | if (!skb) |
1da177e4 LT |
508 | goto out; |
509 | skb_reserve(skb, pf->hdrlen); | |
510 | ret = -EFAULT; | |
511 | if (copy_from_user(skb_put(skb, count), buf, count)) { | |
512 | kfree_skb(skb); | |
513 | goto out; | |
514 | } | |
515 | ||
1da177e4 LT |
516 | switch (pf->kind) { |
517 | case INTERFACE: | |
6d066734 | 518 | ppp_xmit_process(PF_TO_PPP(pf), skb); |
1da177e4 LT |
519 | break; |
520 | case CHANNEL: | |
6d066734 | 521 | skb_queue_tail(&pf->xq, skb); |
1da177e4 LT |
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 */ | |
afc9a42b | 533 | static __poll_t ppp_poll(struct file *file, poll_table *wait) |
1da177e4 LT |
534 | { |
535 | struct ppp_file *pf = file->private_data; | |
afc9a42b | 536 | __poll_t mask; |
1da177e4 | 537 | |
cd228d54 | 538 | if (!pf) |
1da177e4 LT |
539 | return 0; |
540 | poll_wait(file, &pf->rwait, wait); | |
a9a08845 | 541 | mask = EPOLLOUT | EPOLLWRNORM; |
cd228d54 | 542 | if (skb_peek(&pf->rq)) |
a9a08845 | 543 | mask |= EPOLLIN | EPOLLRDNORM; |
1da177e4 | 544 | if (pf->dead) |
a9a08845 | 545 | mask |= EPOLLHUP; |
1da177e4 LT |
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) | |
a9a08845 | 553 | mask |= EPOLLIN | EPOLLRDNORM; |
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 | /* | |
af8d3c7c EB |
608 | * PPPIOCDETACH is no longer supported as it was heavily broken, |
609 | * and is only known to have been used by pppd older than | |
610 | * ppp-2.4.2 (released November 2003). | |
1da177e4 | 611 | */ |
af8d3c7c EB |
612 | pr_warn_once("%s (%d) used obsolete PPPIOCDETACH ioctl\n", |
613 | current->comm, current->pid); | |
1da177e4 | 614 | err = -EINVAL; |
e8e56ffd | 615 | goto out; |
1da177e4 LT |
616 | } |
617 | ||
618 | if (pf->kind == CHANNEL) { | |
f3ff8a4d | 619 | struct channel *pch; |
1da177e4 LT |
620 | struct ppp_channel *chan; |
621 | ||
f3ff8a4d AC |
622 | pch = PF_TO_CHANNEL(pf); |
623 | ||
1da177e4 LT |
624 | switch (cmd) { |
625 | case PPPIOCCONNECT: | |
626 | if (get_user(unit, p)) | |
627 | break; | |
628 | err = ppp_connect_channel(pch, unit); | |
629 | break; | |
630 | ||
631 | case PPPIOCDISCONN: | |
632 | err = ppp_disconnect_channel(pch); | |
633 | break; | |
634 | ||
635 | default: | |
636 | down_read(&pch->chan_sem); | |
637 | chan = pch->chan; | |
638 | err = -ENOTTY; | |
639 | if (chan && chan->ops->ioctl) | |
640 | err = chan->ops->ioctl(chan, cmd, arg); | |
641 | up_read(&pch->chan_sem); | |
642 | } | |
e8e56ffd | 643 | goto out; |
1da177e4 LT |
644 | } |
645 | ||
646 | if (pf->kind != INTERFACE) { | |
647 | /* can't happen */ | |
b48f8c23 | 648 | pr_err("PPP: not interface or channel??\n"); |
e8e56ffd GN |
649 | err = -EINVAL; |
650 | goto out; | |
1da177e4 LT |
651 | } |
652 | ||
653 | ppp = PF_TO_PPP(pf); | |
654 | switch (cmd) { | |
655 | case PPPIOCSMRU: | |
656 | if (get_user(val, p)) | |
657 | break; | |
658 | ppp->mru = val; | |
659 | err = 0; | |
660 | break; | |
661 | ||
662 | case PPPIOCSFLAGS: | |
663 | if (get_user(val, p)) | |
664 | break; | |
665 | ppp_lock(ppp); | |
666 | cflags = ppp->flags & ~val; | |
a9f559c3 | 667 | #ifdef CONFIG_PPP_MULTILINK |
d762d038 CS |
668 | if (!(ppp->flags & SC_MULTILINK) && (val & SC_MULTILINK)) |
669 | ppp->nextseq = 0; | |
a9f559c3 | 670 | #endif |
1da177e4 LT |
671 | ppp->flags = val & SC_FLAG_BITS; |
672 | ppp_unlock(ppp); | |
673 | if (cflags & SC_CCP_OPEN) | |
674 | ppp_ccp_closed(ppp); | |
675 | err = 0; | |
676 | break; | |
677 | ||
678 | case PPPIOCGFLAGS: | |
679 | val = ppp->flags | ppp->xstate | ppp->rstate; | |
680 | if (put_user(val, p)) | |
681 | break; | |
682 | err = 0; | |
683 | break; | |
684 | ||
685 | case PPPIOCSCOMPRESS: | |
686 | err = ppp_set_compress(ppp, arg); | |
687 | break; | |
688 | ||
689 | case PPPIOCGUNIT: | |
690 | if (put_user(ppp->file.index, p)) | |
691 | break; | |
692 | err = 0; | |
693 | break; | |
694 | ||
695 | case PPPIOCSDEBUG: | |
696 | if (get_user(val, p)) | |
697 | break; | |
698 | ppp->debug = val; | |
699 | err = 0; | |
700 | break; | |
701 | ||
702 | case PPPIOCGDEBUG: | |
703 | if (put_user(ppp->debug, p)) | |
704 | break; | |
705 | err = 0; | |
706 | break; | |
707 | ||
708 | case PPPIOCGIDLE: | |
709 | idle.xmit_idle = (jiffies - ppp->last_xmit) / HZ; | |
710 | idle.recv_idle = (jiffies - ppp->last_recv) / HZ; | |
711 | if (copy_to_user(argp, &idle, sizeof(idle))) | |
712 | break; | |
713 | err = 0; | |
714 | break; | |
715 | ||
716 | case PPPIOCSMAXCID: | |
717 | if (get_user(val, p)) | |
718 | break; | |
719 | val2 = 15; | |
720 | if ((val >> 16) != 0) { | |
721 | val2 = val >> 16; | |
722 | val &= 0xffff; | |
723 | } | |
724 | vj = slhc_init(val2+1, val+1); | |
4ab42d78 BH |
725 | if (IS_ERR(vj)) { |
726 | err = PTR_ERR(vj); | |
1da177e4 LT |
727 | break; |
728 | } | |
729 | ppp_lock(ppp); | |
cd228d54 | 730 | if (ppp->vj) |
1da177e4 LT |
731 | slhc_free(ppp->vj); |
732 | ppp->vj = vj; | |
733 | ppp_unlock(ppp); | |
734 | err = 0; | |
735 | break; | |
736 | ||
737 | case PPPIOCGNPMODE: | |
738 | case PPPIOCSNPMODE: | |
739 | if (copy_from_user(&npi, argp, sizeof(npi))) | |
740 | break; | |
741 | err = proto_to_npindex(npi.protocol); | |
742 | if (err < 0) | |
743 | break; | |
744 | i = err; | |
745 | if (cmd == PPPIOCGNPMODE) { | |
746 | err = -EFAULT; | |
747 | npi.mode = ppp->npmode[i]; | |
748 | if (copy_to_user(argp, &npi, sizeof(npi))) | |
749 | break; | |
750 | } else { | |
751 | ppp->npmode[i] = npi.mode; | |
752 | /* we may be able to transmit more packets now (??) */ | |
753 | netif_wake_queue(ppp->dev); | |
754 | } | |
755 | err = 0; | |
756 | break; | |
757 | ||
758 | #ifdef CONFIG_PPP_FILTER | |
759 | case PPPIOCSPASS: | |
760 | { | |
761 | struct sock_filter *code; | |
568f194e | 762 | |
1da177e4 LT |
763 | err = get_filter(argp, &code); |
764 | if (err >= 0) { | |
5748eb8f | 765 | struct bpf_prog *pass_filter = NULL; |
b1fcd35c | 766 | struct sock_fprog_kern fprog = { |
568f194e DB |
767 | .len = err, |
768 | .filter = code, | |
769 | }; | |
770 | ||
5748eb8f TI |
771 | err = 0; |
772 | if (fprog.filter) | |
773 | err = bpf_prog_create(&pass_filter, &fprog); | |
774 | if (!err) { | |
775 | ppp_lock(ppp); | |
776 | if (ppp->pass_filter) | |
777 | bpf_prog_destroy(ppp->pass_filter); | |
778 | ppp->pass_filter = pass_filter; | |
779 | ppp_unlock(ppp); | |
cc25eaae | 780 | } |
568f194e | 781 | kfree(code); |
1da177e4 LT |
782 | } |
783 | break; | |
784 | } | |
785 | case PPPIOCSACTIVE: | |
786 | { | |
787 | struct sock_filter *code; | |
568f194e | 788 | |
1da177e4 LT |
789 | err = get_filter(argp, &code); |
790 | if (err >= 0) { | |
5748eb8f | 791 | struct bpf_prog *active_filter = NULL; |
b1fcd35c | 792 | struct sock_fprog_kern fprog = { |
568f194e DB |
793 | .len = err, |
794 | .filter = code, | |
795 | }; | |
796 | ||
5748eb8f TI |
797 | err = 0; |
798 | if (fprog.filter) | |
799 | err = bpf_prog_create(&active_filter, &fprog); | |
800 | if (!err) { | |
801 | ppp_lock(ppp); | |
802 | if (ppp->active_filter) | |
803 | bpf_prog_destroy(ppp->active_filter); | |
804 | ppp->active_filter = active_filter; | |
805 | ppp_unlock(ppp); | |
cc25eaae | 806 | } |
568f194e | 807 | kfree(code); |
1da177e4 LT |
808 | } |
809 | break; | |
810 | } | |
811 | #endif /* CONFIG_PPP_FILTER */ | |
812 | ||
813 | #ifdef CONFIG_PPP_MULTILINK | |
814 | case PPPIOCSMRRU: | |
815 | if (get_user(val, p)) | |
816 | break; | |
817 | ppp_recv_lock(ppp); | |
818 | ppp->mrru = val; | |
819 | ppp_recv_unlock(ppp); | |
820 | err = 0; | |
821 | break; | |
822 | #endif /* CONFIG_PPP_MULTILINK */ | |
823 | ||
824 | default: | |
825 | err = -ENOTTY; | |
826 | } | |
e8e56ffd GN |
827 | |
828 | out: | |
15fd0cd9 | 829 | mutex_unlock(&ppp_mutex); |
e8e56ffd | 830 | |
1da177e4 LT |
831 | return err; |
832 | } | |
833 | ||
273ec51d CG |
834 | static int ppp_unattached_ioctl(struct net *net, struct ppp_file *pf, |
835 | struct file *file, unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
836 | { |
837 | int unit, err = -EFAULT; | |
838 | struct ppp *ppp; | |
839 | struct channel *chan; | |
273ec51d | 840 | struct ppp_net *pn; |
1da177e4 LT |
841 | int __user *p = (int __user *)arg; |
842 | ||
843 | switch (cmd) { | |
844 | case PPPIOCNEWUNIT: | |
845 | /* Create a new ppp unit */ | |
846 | if (get_user(unit, p)) | |
847 | break; | |
7d9f0b48 GN |
848 | err = ppp_create_interface(net, file, &unit); |
849 | if (err < 0) | |
1da177e4 | 850 | break; |
7d9f0b48 | 851 | |
1da177e4 | 852 | err = -EFAULT; |
7d9f0b48 | 853 | if (put_user(unit, p)) |
1da177e4 LT |
854 | break; |
855 | err = 0; | |
856 | break; | |
857 | ||
858 | case PPPIOCATTACH: | |
859 | /* Attach to an existing ppp unit */ | |
860 | if (get_user(unit, p)) | |
861 | break; | |
1da177e4 | 862 | err = -ENXIO; |
273ec51d CG |
863 | pn = ppp_pernet(net); |
864 | mutex_lock(&pn->all_ppp_mutex); | |
865 | ppp = ppp_find_unit(pn, unit); | |
cd228d54 | 866 | if (ppp) { |
d780cd44 | 867 | refcount_inc(&ppp->file.refcnt); |
1da177e4 LT |
868 | file->private_data = &ppp->file; |
869 | err = 0; | |
870 | } | |
273ec51d | 871 | mutex_unlock(&pn->all_ppp_mutex); |
1da177e4 LT |
872 | break; |
873 | ||
874 | case PPPIOCATTCHAN: | |
875 | if (get_user(unit, p)) | |
876 | break; | |
1da177e4 | 877 | err = -ENXIO; |
273ec51d CG |
878 | pn = ppp_pernet(net); |
879 | spin_lock_bh(&pn->all_channels_lock); | |
880 | chan = ppp_find_channel(pn, unit); | |
cd228d54 | 881 | if (chan) { |
d780cd44 | 882 | refcount_inc(&chan->file.refcnt); |
1da177e4 LT |
883 | file->private_data = &chan->file; |
884 | err = 0; | |
885 | } | |
273ec51d | 886 | spin_unlock_bh(&pn->all_channels_lock); |
1da177e4 LT |
887 | break; |
888 | ||
889 | default: | |
890 | err = -ENOTTY; | |
891 | } | |
e8e56ffd | 892 | |
1da177e4 LT |
893 | return err; |
894 | } | |
895 | ||
d54b1fdb | 896 | static const struct file_operations ppp_device_fops = { |
1da177e4 LT |
897 | .owner = THIS_MODULE, |
898 | .read = ppp_read, | |
899 | .write = ppp_write, | |
900 | .poll = ppp_poll, | |
f3ff8a4d | 901 | .unlocked_ioctl = ppp_ioctl, |
1da177e4 | 902 | .open = ppp_open, |
6038f373 AB |
903 | .release = ppp_release, |
904 | .llseek = noop_llseek, | |
1da177e4 LT |
905 | }; |
906 | ||
273ec51d CG |
907 | static __net_init int ppp_init_net(struct net *net) |
908 | { | |
741a6fa2 | 909 | struct ppp_net *pn = net_generic(net, ppp_net_id); |
273ec51d CG |
910 | |
911 | idr_init(&pn->units_idr); | |
912 | mutex_init(&pn->all_ppp_mutex); | |
913 | ||
914 | INIT_LIST_HEAD(&pn->all_channels); | |
915 | INIT_LIST_HEAD(&pn->new_channels); | |
916 | ||
917 | spin_lock_init(&pn->all_channels_lock); | |
918 | ||
273ec51d CG |
919 | return 0; |
920 | } | |
921 | ||
922 | static __net_exit void ppp_exit_net(struct net *net) | |
923 | { | |
741a6fa2 | 924 | struct ppp_net *pn = net_generic(net, ppp_net_id); |
79c441ae GN |
925 | struct net_device *dev; |
926 | struct net_device *aux; | |
8cb775bc GN |
927 | struct ppp *ppp; |
928 | LIST_HEAD(list); | |
929 | int id; | |
930 | ||
931 | rtnl_lock(); | |
79c441ae GN |
932 | for_each_netdev_safe(net, dev, aux) { |
933 | if (dev->netdev_ops == &ppp_netdev_ops) | |
934 | unregister_netdevice_queue(dev, &list); | |
935 | } | |
936 | ||
8cb775bc | 937 | idr_for_each_entry(&pn->units_idr, ppp, id) |
79c441ae GN |
938 | /* Skip devices already unregistered by previous loop */ |
939 | if (!net_eq(dev_net(ppp->dev), net)) | |
940 | unregister_netdevice_queue(ppp->dev, &list); | |
8cb775bc GN |
941 | |
942 | unregister_netdevice_many(&list); | |
943 | rtnl_unlock(); | |
273ec51d | 944 | |
f02b2320 | 945 | mutex_destroy(&pn->all_ppp_mutex); |
273ec51d | 946 | idr_destroy(&pn->units_idr); |
e6675000 VA |
947 | WARN_ON_ONCE(!list_empty(&pn->all_channels)); |
948 | WARN_ON_ONCE(!list_empty(&pn->new_channels)); | |
273ec51d CG |
949 | } |
950 | ||
0012985d | 951 | static struct pernet_operations ppp_net_ops = { |
273ec51d CG |
952 | .init = ppp_init_net, |
953 | .exit = ppp_exit_net, | |
741a6fa2 EB |
954 | .id = &ppp_net_id, |
955 | .size = sizeof(struct ppp_net), | |
273ec51d CG |
956 | }; |
957 | ||
96d934c7 | 958 | static int ppp_unit_register(struct ppp *ppp, int unit, bool ifname_is_set) |
7d9f0b48 GN |
959 | { |
960 | struct ppp_net *pn = ppp_pernet(ppp->ppp_net); | |
961 | int ret; | |
962 | ||
963 | mutex_lock(&pn->all_ppp_mutex); | |
964 | ||
965 | if (unit < 0) { | |
966 | ret = unit_get(&pn->units_idr, ppp); | |
967 | if (ret < 0) | |
968 | goto err; | |
969 | } else { | |
970 | /* Caller asked for a specific unit number. Fail with -EEXIST | |
971 | * if unavailable. For backward compatibility, return -EEXIST | |
972 | * too if idr allocation fails; this makes pppd retry without | |
973 | * requesting a specific unit number. | |
974 | */ | |
975 | if (unit_find(&pn->units_idr, unit)) { | |
976 | ret = -EEXIST; | |
977 | goto err; | |
978 | } | |
979 | ret = unit_set(&pn->units_idr, ppp, unit); | |
980 | if (ret < 0) { | |
981 | /* Rewrite error for backward compatibility */ | |
982 | ret = -EEXIST; | |
983 | goto err; | |
984 | } | |
985 | } | |
986 | ppp->file.index = ret; | |
987 | ||
96d934c7 GN |
988 | if (!ifname_is_set) |
989 | snprintf(ppp->dev->name, IFNAMSIZ, "ppp%i", ppp->file.index); | |
7d9f0b48 | 990 | |
0171c418 GN |
991 | mutex_unlock(&pn->all_ppp_mutex); |
992 | ||
7d9f0b48 GN |
993 | ret = register_netdevice(ppp->dev); |
994 | if (ret < 0) | |
995 | goto err_unit; | |
996 | ||
997 | atomic_inc(&ppp_unit_count); | |
998 | ||
7d9f0b48 GN |
999 | return 0; |
1000 | ||
1001 | err_unit: | |
0171c418 | 1002 | mutex_lock(&pn->all_ppp_mutex); |
7d9f0b48 GN |
1003 | unit_put(&pn->units_idr, ppp->file.index); |
1004 | err: | |
1005 | mutex_unlock(&pn->all_ppp_mutex); | |
1006 | ||
1007 | return ret; | |
1008 | } | |
1009 | ||
1010 | static int ppp_dev_configure(struct net *src_net, struct net_device *dev, | |
1011 | const struct ppp_config *conf) | |
1012 | { | |
1013 | struct ppp *ppp = netdev_priv(dev); | |
1014 | int indx; | |
1015 | int err; | |
e5dadc65 | 1016 | int cpu; |
7d9f0b48 GN |
1017 | |
1018 | ppp->dev = dev; | |
1019 | ppp->ppp_net = src_net; | |
1020 | ppp->mru = PPP_MRU; | |
1021 | ppp->owner = conf->file; | |
1022 | ||
1023 | init_ppp_file(&ppp->file, INTERFACE); | |
1024 | ppp->file.hdrlen = PPP_HDRLEN - 2; /* don't count proto bytes */ | |
1025 | ||
1026 | for (indx = 0; indx < NUM_NP; ++indx) | |
1027 | ppp->npmode[indx] = NPMODE_PASS; | |
1028 | INIT_LIST_HEAD(&ppp->channels); | |
1029 | spin_lock_init(&ppp->rlock); | |
1030 | spin_lock_init(&ppp->wlock); | |
e5dadc65 GF |
1031 | |
1032 | ppp->xmit_recursion = alloc_percpu(int); | |
1033 | if (!ppp->xmit_recursion) { | |
1034 | err = -ENOMEM; | |
1035 | goto err1; | |
1036 | } | |
1037 | for_each_possible_cpu(cpu) | |
1038 | (*per_cpu_ptr(ppp->xmit_recursion, cpu)) = 0; | |
1039 | ||
7d9f0b48 GN |
1040 | #ifdef CONFIG_PPP_MULTILINK |
1041 | ppp->minseq = -1; | |
1042 | skb_queue_head_init(&ppp->mrq); | |
1043 | #endif /* CONFIG_PPP_MULTILINK */ | |
1044 | #ifdef CONFIG_PPP_FILTER | |
1045 | ppp->pass_filter = NULL; | |
1046 | ppp->active_filter = NULL; | |
1047 | #endif /* CONFIG_PPP_FILTER */ | |
1048 | ||
96d934c7 | 1049 | err = ppp_unit_register(ppp, conf->unit, conf->ifname_is_set); |
7d9f0b48 | 1050 | if (err < 0) |
e5dadc65 | 1051 | goto err2; |
7d9f0b48 GN |
1052 | |
1053 | conf->file->private_data = &ppp->file; | |
1054 | ||
1055 | return 0; | |
e5dadc65 GF |
1056 | err2: |
1057 | free_percpu(ppp->xmit_recursion); | |
1058 | err1: | |
1059 | return err; | |
7d9f0b48 GN |
1060 | } |
1061 | ||
96d934c7 GN |
1062 | static const struct nla_policy ppp_nl_policy[IFLA_PPP_MAX + 1] = { |
1063 | [IFLA_PPP_DEV_FD] = { .type = NLA_S32 }, | |
1064 | }; | |
1065 | ||
a8b8a889 MS |
1066 | static int ppp_nl_validate(struct nlattr *tb[], struct nlattr *data[], |
1067 | struct netlink_ext_ack *extack) | |
96d934c7 GN |
1068 | { |
1069 | if (!data) | |
1070 | return -EINVAL; | |
1071 | ||
1072 | if (!data[IFLA_PPP_DEV_FD]) | |
1073 | return -EINVAL; | |
1074 | if (nla_get_s32(data[IFLA_PPP_DEV_FD]) < 0) | |
1075 | return -EBADF; | |
1076 | ||
1077 | return 0; | |
1078 | } | |
1079 | ||
1080 | static int ppp_nl_newlink(struct net *src_net, struct net_device *dev, | |
7a3f4a18 MS |
1081 | struct nlattr *tb[], struct nlattr *data[], |
1082 | struct netlink_ext_ack *extack) | |
96d934c7 GN |
1083 | { |
1084 | struct ppp_config conf = { | |
1085 | .unit = -1, | |
1086 | .ifname_is_set = true, | |
1087 | }; | |
1088 | struct file *file; | |
1089 | int err; | |
1090 | ||
1091 | file = fget(nla_get_s32(data[IFLA_PPP_DEV_FD])); | |
1092 | if (!file) | |
1093 | return -EBADF; | |
1094 | ||
1095 | /* rtnl_lock is already held here, but ppp_create_interface() locks | |
1096 | * ppp_mutex before holding rtnl_lock. Using mutex_trylock() avoids | |
1097 | * possible deadlock due to lock order inversion, at the cost of | |
1098 | * pushing the problem back to userspace. | |
1099 | */ | |
1100 | if (!mutex_trylock(&ppp_mutex)) { | |
1101 | err = -EBUSY; | |
1102 | goto out; | |
1103 | } | |
1104 | ||
1105 | if (file->f_op != &ppp_device_fops || file->private_data) { | |
1106 | err = -EBADF; | |
1107 | goto out_unlock; | |
1108 | } | |
1109 | ||
1110 | conf.file = file; | |
bb8082f6 GN |
1111 | |
1112 | /* Don't use device name generated by the rtnetlink layer when ifname | |
1113 | * isn't specified. Let ppp_dev_configure() set the device name using | |
1114 | * the PPP unit identifer as suffix (i.e. ppp<unit_id>). This allows | |
1115 | * userspace to infer the device name using to the PPPIOCGUNIT ioctl. | |
1116 | */ | |
1117 | if (!tb[IFLA_IFNAME]) | |
1118 | conf.ifname_is_set = false; | |
1119 | ||
96d934c7 GN |
1120 | err = ppp_dev_configure(src_net, dev, &conf); |
1121 | ||
1122 | out_unlock: | |
1123 | mutex_unlock(&ppp_mutex); | |
1124 | out: | |
1125 | fput(file); | |
1126 | ||
1127 | return err; | |
1128 | } | |
1129 | ||
1130 | static void ppp_nl_dellink(struct net_device *dev, struct list_head *head) | |
1131 | { | |
1132 | unregister_netdevice_queue(dev, head); | |
1133 | } | |
1134 | ||
1135 | static size_t ppp_nl_get_size(const struct net_device *dev) | |
1136 | { | |
1137 | return 0; | |
1138 | } | |
1139 | ||
1140 | static int ppp_nl_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1141 | { | |
1142 | return 0; | |
1143 | } | |
1144 | ||
1145 | static struct net *ppp_nl_get_link_net(const struct net_device *dev) | |
1146 | { | |
1147 | struct ppp *ppp = netdev_priv(dev); | |
1148 | ||
1149 | return ppp->ppp_net; | |
1150 | } | |
1151 | ||
1152 | static struct rtnl_link_ops ppp_link_ops __read_mostly = { | |
1153 | .kind = "ppp", | |
1154 | .maxtype = IFLA_PPP_MAX, | |
1155 | .policy = ppp_nl_policy, | |
1156 | .priv_size = sizeof(struct ppp), | |
1157 | .setup = ppp_setup, | |
1158 | .validate = ppp_nl_validate, | |
1159 | .newlink = ppp_nl_newlink, | |
1160 | .dellink = ppp_nl_dellink, | |
1161 | .get_size = ppp_nl_get_size, | |
1162 | .fill_info = ppp_nl_fill_info, | |
1163 | .get_link_net = ppp_nl_get_link_net, | |
1164 | }; | |
1165 | ||
1da177e4 LT |
1166 | #define PPP_MAJOR 108 |
1167 | ||
1168 | /* Called at boot time if ppp is compiled into the kernel, | |
1169 | or at module load time (from init_module) if compiled as a module. */ | |
1170 | static int __init ppp_init(void) | |
1171 | { | |
1172 | int err; | |
1173 | ||
b48f8c23 | 1174 | pr_info("PPP generic driver version " PPP_VERSION "\n"); |
273ec51d | 1175 | |
741a6fa2 | 1176 | err = register_pernet_device(&ppp_net_ops); |
273ec51d | 1177 | if (err) { |
b48f8c23 | 1178 | pr_err("failed to register PPP pernet device (%d)\n", err); |
273ec51d | 1179 | goto out; |
1da177e4 LT |
1180 | } |
1181 | ||
273ec51d CG |
1182 | err = register_chrdev(PPP_MAJOR, "ppp", &ppp_device_fops); |
1183 | if (err) { | |
b48f8c23 | 1184 | pr_err("failed to register PPP device (%d)\n", err); |
273ec51d CG |
1185 | goto out_net; |
1186 | } | |
1187 | ||
1188 | ppp_class = class_create(THIS_MODULE, "ppp"); | |
1189 | if (IS_ERR(ppp_class)) { | |
1190 | err = PTR_ERR(ppp_class); | |
1191 | goto out_chrdev; | |
1192 | } | |
1193 | ||
96d934c7 GN |
1194 | err = rtnl_link_register(&ppp_link_ops); |
1195 | if (err) { | |
1196 | pr_err("failed to register rtnetlink PPP handler\n"); | |
1197 | goto out_class; | |
1198 | } | |
1199 | ||
273ec51d CG |
1200 | /* not a big deal if we fail here :-) */ |
1201 | device_create(ppp_class, NULL, MKDEV(PPP_MAJOR, 0), NULL, "ppp"); | |
1202 | ||
1203 | return 0; | |
1da177e4 | 1204 | |
96d934c7 GN |
1205 | out_class: |
1206 | class_destroy(ppp_class); | |
1da177e4 LT |
1207 | out_chrdev: |
1208 | unregister_chrdev(PPP_MAJOR, "ppp"); | |
273ec51d | 1209 | out_net: |
741a6fa2 | 1210 | unregister_pernet_device(&ppp_net_ops); |
273ec51d CG |
1211 | out: |
1212 | return err; | |
1da177e4 LT |
1213 | } |
1214 | ||
1215 | /* | |
1216 | * Network interface unit routines. | |
1217 | */ | |
424efe9c | 1218 | static netdev_tx_t |
1da177e4 LT |
1219 | ppp_start_xmit(struct sk_buff *skb, struct net_device *dev) |
1220 | { | |
c8019bf3 | 1221 | struct ppp *ppp = netdev_priv(dev); |
1da177e4 LT |
1222 | int npi, proto; |
1223 | unsigned char *pp; | |
1224 | ||
1225 | npi = ethertype_to_npindex(ntohs(skb->protocol)); | |
1226 | if (npi < 0) | |
1227 | goto outf; | |
1228 | ||
1229 | /* Drop, accept or reject the packet */ | |
1230 | switch (ppp->npmode[npi]) { | |
1231 | case NPMODE_PASS: | |
1232 | break; | |
1233 | case NPMODE_QUEUE: | |
1234 | /* it would be nice to have a way to tell the network | |
1235 | system to queue this one up for later. */ | |
1236 | goto outf; | |
1237 | case NPMODE_DROP: | |
1238 | case NPMODE_ERROR: | |
1239 | goto outf; | |
1240 | } | |
1241 | ||
1242 | /* Put the 2-byte PPP protocol number on the front, | |
1243 | making sure there is room for the address and control fields. */ | |
7b797d5b HX |
1244 | if (skb_cow_head(skb, PPP_HDRLEN)) |
1245 | goto outf; | |
1246 | ||
1da177e4 LT |
1247 | pp = skb_push(skb, 2); |
1248 | proto = npindex_to_proto[npi]; | |
96545aeb | 1249 | put_unaligned_be16(proto, pp); |
1da177e4 | 1250 | |
79c441ae | 1251 | skb_scrub_packet(skb, !net_eq(ppp->ppp_net, dev_net(dev))); |
6d066734 GN |
1252 | ppp_xmit_process(ppp, skb); |
1253 | ||
6ed10654 | 1254 | return NETDEV_TX_OK; |
1da177e4 LT |
1255 | |
1256 | outf: | |
1257 | kfree_skb(skb); | |
6ceffd47 | 1258 | ++dev->stats.tx_dropped; |
6ed10654 | 1259 | return NETDEV_TX_OK; |
1da177e4 LT |
1260 | } |
1261 | ||
1da177e4 LT |
1262 | static int |
1263 | ppp_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
1264 | { | |
c8019bf3 | 1265 | struct ppp *ppp = netdev_priv(dev); |
1da177e4 LT |
1266 | int err = -EFAULT; |
1267 | void __user *addr = (void __user *) ifr->ifr_ifru.ifru_data; | |
1268 | struct ppp_stats stats; | |
1269 | struct ppp_comp_stats cstats; | |
1270 | char *vers; | |
1271 | ||
1272 | switch (cmd) { | |
1273 | case SIOCGPPPSTATS: | |
1274 | ppp_get_stats(ppp, &stats); | |
1275 | if (copy_to_user(addr, &stats, sizeof(stats))) | |
1276 | break; | |
1277 | err = 0; | |
1278 | break; | |
1279 | ||
1280 | case SIOCGPPPCSTATS: | |
1281 | memset(&cstats, 0, sizeof(cstats)); | |
cd228d54 | 1282 | if (ppp->xc_state) |
1da177e4 | 1283 | ppp->xcomp->comp_stat(ppp->xc_state, &cstats.c); |
cd228d54 | 1284 | if (ppp->rc_state) |
1da177e4 LT |
1285 | ppp->rcomp->decomp_stat(ppp->rc_state, &cstats.d); |
1286 | if (copy_to_user(addr, &cstats, sizeof(cstats))) | |
1287 | break; | |
1288 | err = 0; | |
1289 | break; | |
1290 | ||
1291 | case SIOCGPPPVER: | |
1292 | vers = PPP_VERSION; | |
1293 | if (copy_to_user(addr, vers, strlen(vers) + 1)) | |
1294 | break; | |
1295 | err = 0; | |
1296 | break; | |
1297 | ||
1298 | default: | |
1299 | err = -EINVAL; | |
1300 | } | |
1301 | ||
1302 | return err; | |
1303 | } | |
1304 | ||
bc1f4470 | 1305 | static void |
e51f6ff3 KG |
1306 | ppp_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats64) |
1307 | { | |
1308 | struct ppp *ppp = netdev_priv(dev); | |
1309 | ||
1310 | ppp_recv_lock(ppp); | |
1311 | stats64->rx_packets = ppp->stats64.rx_packets; | |
1312 | stats64->rx_bytes = ppp->stats64.rx_bytes; | |
1313 | ppp_recv_unlock(ppp); | |
1314 | ||
1315 | ppp_xmit_lock(ppp); | |
1316 | stats64->tx_packets = ppp->stats64.tx_packets; | |
1317 | stats64->tx_bytes = ppp->stats64.tx_bytes; | |
1318 | ppp_xmit_unlock(ppp); | |
1319 | ||
1320 | stats64->rx_errors = dev->stats.rx_errors; | |
1321 | stats64->tx_errors = dev->stats.tx_errors; | |
1322 | stats64->rx_dropped = dev->stats.rx_dropped; | |
1323 | stats64->tx_dropped = dev->stats.tx_dropped; | |
1324 | stats64->rx_length_errors = dev->stats.rx_length_errors; | |
e51f6ff3 KG |
1325 | } |
1326 | ||
303c07db ED |
1327 | static int ppp_dev_init(struct net_device *dev) |
1328 | { | |
6151b8b3 GN |
1329 | struct ppp *ppp; |
1330 | ||
d3fff6c4 | 1331 | netdev_lockdep_set_classes(dev); |
6151b8b3 GN |
1332 | |
1333 | ppp = netdev_priv(dev); | |
1334 | /* Let the netdevice take a reference on the ppp file. This ensures | |
1335 | * that ppp_destroy_interface() won't run before the device gets | |
1336 | * unregistered. | |
1337 | */ | |
d780cd44 | 1338 | refcount_inc(&ppp->file.refcnt); |
6151b8b3 | 1339 | |
303c07db ED |
1340 | return 0; |
1341 | } | |
1342 | ||
8cb775bc GN |
1343 | static void ppp_dev_uninit(struct net_device *dev) |
1344 | { | |
1345 | struct ppp *ppp = netdev_priv(dev); | |
1346 | struct ppp_net *pn = ppp_pernet(ppp->ppp_net); | |
1347 | ||
1348 | ppp_lock(ppp); | |
1349 | ppp->closing = 1; | |
1350 | ppp_unlock(ppp); | |
1351 | ||
1352 | mutex_lock(&pn->all_ppp_mutex); | |
1353 | unit_put(&pn->units_idr, ppp->file.index); | |
1354 | mutex_unlock(&pn->all_ppp_mutex); | |
1355 | ||
1356 | ppp->owner = NULL; | |
1357 | ||
1358 | ppp->file.dead = 1; | |
1359 | wake_up_interruptible(&ppp->file.rwait); | |
1360 | } | |
1361 | ||
6151b8b3 GN |
1362 | static void ppp_dev_priv_destructor(struct net_device *dev) |
1363 | { | |
1364 | struct ppp *ppp; | |
1365 | ||
1366 | ppp = netdev_priv(dev); | |
d780cd44 | 1367 | if (refcount_dec_and_test(&ppp->file.refcnt)) |
6151b8b3 GN |
1368 | ppp_destroy_interface(ppp); |
1369 | } | |
1370 | ||
52256cfc | 1371 | static const struct net_device_ops ppp_netdev_ops = { |
303c07db | 1372 | .ndo_init = ppp_dev_init, |
8cb775bc | 1373 | .ndo_uninit = ppp_dev_uninit, |
e51f6ff3 KG |
1374 | .ndo_start_xmit = ppp_start_xmit, |
1375 | .ndo_do_ioctl = ppp_net_ioctl, | |
1376 | .ndo_get_stats64 = ppp_get_stats64, | |
52256cfc SH |
1377 | }; |
1378 | ||
94dbffe1 GN |
1379 | static struct device_type ppp_type = { |
1380 | .name = "ppp", | |
1381 | }; | |
1382 | ||
1da177e4 LT |
1383 | static void ppp_setup(struct net_device *dev) |
1384 | { | |
52256cfc | 1385 | dev->netdev_ops = &ppp_netdev_ops; |
94dbffe1 GN |
1386 | SET_NETDEV_DEVTYPE(dev, &ppp_type); |
1387 | ||
07712770 GN |
1388 | dev->features |= NETIF_F_LLTX; |
1389 | ||
1da177e4 | 1390 | dev->hard_header_len = PPP_HDRLEN; |
bf7daebb | 1391 | dev->mtu = PPP_MRU; |
1da177e4 LT |
1392 | dev->addr_len = 0; |
1393 | dev->tx_queue_len = 3; | |
1394 | dev->type = ARPHRD_PPP; | |
1395 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
6151b8b3 | 1396 | dev->priv_destructor = ppp_dev_priv_destructor; |
02875878 | 1397 | netif_keep_dst(dev); |
1da177e4 LT |
1398 | } |
1399 | ||
1400 | /* | |
1401 | * Transmit-side routines. | |
1402 | */ | |
1403 | ||
55454a56 | 1404 | /* Called to do any work queued up on the transmit side that can now be done */ |
6d066734 | 1405 | static void __ppp_xmit_process(struct ppp *ppp, struct sk_buff *skb) |
1da177e4 | 1406 | { |
1da177e4 | 1407 | ppp_xmit_lock(ppp); |
739840d5 | 1408 | if (!ppp->closing) { |
1da177e4 | 1409 | ppp_push(ppp); |
6d066734 GN |
1410 | |
1411 | if (skb) | |
1412 | skb_queue_tail(&ppp->file.xq, skb); | |
8e95a202 JP |
1413 | while (!ppp->xmit_pending && |
1414 | (skb = skb_dequeue(&ppp->file.xq))) | |
1da177e4 LT |
1415 | ppp_send_frame(ppp, skb); |
1416 | /* If there's no work left to do, tell the core net | |
1417 | code that we can accept some more. */ | |
9a5d2bd9 | 1418 | if (!ppp->xmit_pending && !skb_peek(&ppp->file.xq)) |
1da177e4 | 1419 | netif_wake_queue(ppp->dev); |
9a5d2bd9 DW |
1420 | else |
1421 | netif_stop_queue(ppp->dev); | |
1da177e4 LT |
1422 | } |
1423 | ppp_xmit_unlock(ppp); | |
1424 | } | |
1425 | ||
6d066734 | 1426 | static void ppp_xmit_process(struct ppp *ppp, struct sk_buff *skb) |
55454a56 GN |
1427 | { |
1428 | local_bh_disable(); | |
1429 | ||
e5dadc65 | 1430 | if (unlikely(*this_cpu_ptr(ppp->xmit_recursion))) |
55454a56 GN |
1431 | goto err; |
1432 | ||
e5dadc65 | 1433 | (*this_cpu_ptr(ppp->xmit_recursion))++; |
6d066734 | 1434 | __ppp_xmit_process(ppp, skb); |
e5dadc65 | 1435 | (*this_cpu_ptr(ppp->xmit_recursion))--; |
55454a56 GN |
1436 | |
1437 | local_bh_enable(); | |
1438 | ||
1439 | return; | |
1440 | ||
1441 | err: | |
1442 | local_bh_enable(); | |
1443 | ||
6d066734 GN |
1444 | kfree_skb(skb); |
1445 | ||
55454a56 GN |
1446 | if (net_ratelimit()) |
1447 | netdev_err(ppp->dev, "recursion detected\n"); | |
1448 | } | |
1449 | ||
b3f9b92a MD |
1450 | static inline struct sk_buff * |
1451 | pad_compress_skb(struct ppp *ppp, struct sk_buff *skb) | |
1452 | { | |
1453 | struct sk_buff *new_skb; | |
1454 | int len; | |
1455 | int new_skb_size = ppp->dev->mtu + | |
1456 | ppp->xcomp->comp_extra + ppp->dev->hard_header_len; | |
1457 | int compressor_skb_size = ppp->dev->mtu + | |
1458 | ppp->xcomp->comp_extra + PPP_HDRLEN; | |
1459 | new_skb = alloc_skb(new_skb_size, GFP_ATOMIC); | |
1460 | if (!new_skb) { | |
1461 | if (net_ratelimit()) | |
b48f8c23 | 1462 | netdev_err(ppp->dev, "PPP: no memory (comp pkt)\n"); |
b3f9b92a MD |
1463 | return NULL; |
1464 | } | |
1465 | if (ppp->dev->hard_header_len > PPP_HDRLEN) | |
1466 | skb_reserve(new_skb, | |
1467 | ppp->dev->hard_header_len - PPP_HDRLEN); | |
1468 | ||
1469 | /* compressor still expects A/C bytes in hdr */ | |
1470 | len = ppp->xcomp->compress(ppp->xc_state, skb->data - 2, | |
1471 | new_skb->data, skb->len + 2, | |
1472 | compressor_skb_size); | |
1473 | if (len > 0 && (ppp->flags & SC_CCP_UP)) { | |
968d7018 | 1474 | consume_skb(skb); |
b3f9b92a MD |
1475 | skb = new_skb; |
1476 | skb_put(skb, len); | |
1477 | skb_pull(skb, 2); /* pull off A/C bytes */ | |
1478 | } else if (len == 0) { | |
1479 | /* didn't compress, or CCP not up yet */ | |
968d7018 | 1480 | consume_skb(new_skb); |
b3f9b92a MD |
1481 | new_skb = skb; |
1482 | } else { | |
1483 | /* | |
1484 | * (len < 0) | |
1485 | * MPPE requires that we do not send unencrypted | |
1486 | * frames. The compressor will return -1 if we | |
1487 | * should drop the frame. We cannot simply test | |
1488 | * the compress_proto because MPPE and MPPC share | |
1489 | * the same number. | |
1490 | */ | |
1491 | if (net_ratelimit()) | |
b48f8c23 | 1492 | netdev_err(ppp->dev, "ppp: compressor dropped pkt\n"); |
b3f9b92a | 1493 | kfree_skb(skb); |
968d7018 | 1494 | consume_skb(new_skb); |
b3f9b92a MD |
1495 | new_skb = NULL; |
1496 | } | |
1497 | return new_skb; | |
1498 | } | |
1499 | ||
1da177e4 LT |
1500 | /* |
1501 | * Compress and send a frame. | |
1502 | * The caller should have locked the xmit path, | |
1503 | * and xmit_pending should be 0. | |
1504 | */ | |
1505 | static void | |
1506 | ppp_send_frame(struct ppp *ppp, struct sk_buff *skb) | |
1507 | { | |
1508 | int proto = PPP_PROTO(skb); | |
1509 | struct sk_buff *new_skb; | |
1510 | int len; | |
1511 | unsigned char *cp; | |
1512 | ||
1513 | if (proto < 0x8000) { | |
1514 | #ifdef CONFIG_PPP_FILTER | |
1515 | /* check if we should pass this packet */ | |
1516 | /* the filter instructions are constructed assuming | |
1517 | a four-byte PPP header on each packet */ | |
d58ff351 | 1518 | *(u8 *)skb_push(skb, 2) = 1; |
8e95a202 | 1519 | if (ppp->pass_filter && |
7ae457c1 | 1520 | BPF_PROG_RUN(ppp->pass_filter, skb) == 0) { |
1da177e4 | 1521 | if (ppp->debug & 1) |
b48f8c23 DM |
1522 | netdev_printk(KERN_DEBUG, ppp->dev, |
1523 | "PPP: outbound frame " | |
1524 | "not passed\n"); | |
1da177e4 LT |
1525 | kfree_skb(skb); |
1526 | return; | |
1527 | } | |
1528 | /* if this packet passes the active filter, record the time */ | |
8e95a202 | 1529 | if (!(ppp->active_filter && |
7ae457c1 | 1530 | BPF_PROG_RUN(ppp->active_filter, skb) == 0)) |
1da177e4 LT |
1531 | ppp->last_xmit = jiffies; |
1532 | skb_pull(skb, 2); | |
1533 | #else | |
1534 | /* for data packets, record the time */ | |
1535 | ppp->last_xmit = jiffies; | |
1536 | #endif /* CONFIG_PPP_FILTER */ | |
1537 | } | |
1538 | ||
e51f6ff3 KG |
1539 | ++ppp->stats64.tx_packets; |
1540 | ppp->stats64.tx_bytes += skb->len - 2; | |
1da177e4 LT |
1541 | |
1542 | switch (proto) { | |
1543 | case PPP_IP: | |
cd228d54 | 1544 | if (!ppp->vj || (ppp->flags & SC_COMP_TCP) == 0) |
1da177e4 LT |
1545 | break; |
1546 | /* try to do VJ TCP header compression */ | |
1547 | new_skb = alloc_skb(skb->len + ppp->dev->hard_header_len - 2, | |
1548 | GFP_ATOMIC); | |
cd228d54 | 1549 | if (!new_skb) { |
b48f8c23 | 1550 | netdev_err(ppp->dev, "PPP: no memory (VJ comp pkt)\n"); |
1da177e4 LT |
1551 | goto drop; |
1552 | } | |
1553 | skb_reserve(new_skb, ppp->dev->hard_header_len - 2); | |
1554 | cp = skb->data + 2; | |
1555 | len = slhc_compress(ppp->vj, cp, skb->len - 2, | |
1556 | new_skb->data + 2, &cp, | |
1557 | !(ppp->flags & SC_NO_TCP_CCID)); | |
1558 | if (cp == skb->data + 2) { | |
1559 | /* didn't compress */ | |
968d7018 | 1560 | consume_skb(new_skb); |
1da177e4 LT |
1561 | } else { |
1562 | if (cp[0] & SL_TYPE_COMPRESSED_TCP) { | |
1563 | proto = PPP_VJC_COMP; | |
1564 | cp[0] &= ~SL_TYPE_COMPRESSED_TCP; | |
1565 | } else { | |
1566 | proto = PPP_VJC_UNCOMP; | |
1567 | cp[0] = skb->data[2]; | |
1568 | } | |
968d7018 | 1569 | consume_skb(skb); |
1da177e4 LT |
1570 | skb = new_skb; |
1571 | cp = skb_put(skb, len + 2); | |
1572 | cp[0] = 0; | |
1573 | cp[1] = proto; | |
1574 | } | |
1575 | break; | |
1576 | ||
1577 | case PPP_CCP: | |
1578 | /* peek at outbound CCP frames */ | |
1579 | ppp_ccp_peek(ppp, skb, 0); | |
1580 | break; | |
1581 | } | |
1582 | ||
1583 | /* try to do packet compression */ | |
8e95a202 JP |
1584 | if ((ppp->xstate & SC_COMP_RUN) && ppp->xc_state && |
1585 | proto != PPP_LCP && proto != PPP_CCP) { | |
b3f9b92a MD |
1586 | if (!(ppp->flags & SC_CCP_UP) && (ppp->flags & SC_MUST_COMP)) { |
1587 | if (net_ratelimit()) | |
b48f8c23 DM |
1588 | netdev_err(ppp->dev, |
1589 | "ppp: compression required but " | |
1590 | "down - pkt dropped.\n"); | |
1da177e4 LT |
1591 | goto drop; |
1592 | } | |
b3f9b92a MD |
1593 | skb = pad_compress_skb(ppp, skb); |
1594 | if (!skb) | |
1595 | goto drop; | |
1da177e4 LT |
1596 | } |
1597 | ||
1598 | /* | |
1599 | * If we are waiting for traffic (demand dialling), | |
1600 | * queue it up for pppd to receive. | |
1601 | */ | |
1602 | if (ppp->flags & SC_LOOP_TRAFFIC) { | |
1603 | if (ppp->file.rq.qlen > PPP_MAX_RQLEN) | |
1604 | goto drop; | |
1605 | skb_queue_tail(&ppp->file.rq, skb); | |
1606 | wake_up_interruptible(&ppp->file.rwait); | |
1607 | return; | |
1608 | } | |
1609 | ||
1610 | ppp->xmit_pending = skb; | |
1611 | ppp_push(ppp); | |
1612 | return; | |
1613 | ||
1614 | drop: | |
1d2f8c95 | 1615 | kfree_skb(skb); |
8c0469cd | 1616 | ++ppp->dev->stats.tx_errors; |
1da177e4 LT |
1617 | } |
1618 | ||
1619 | /* | |
1620 | * Try to send the frame in xmit_pending. | |
1621 | * The caller should have the xmit path locked. | |
1622 | */ | |
1623 | static void | |
1624 | ppp_push(struct ppp *ppp) | |
1625 | { | |
1626 | struct list_head *list; | |
1627 | struct channel *pch; | |
1628 | struct sk_buff *skb = ppp->xmit_pending; | |
1629 | ||
cd228d54 | 1630 | if (!skb) |
1da177e4 LT |
1631 | return; |
1632 | ||
1633 | list = &ppp->channels; | |
1634 | if (list_empty(list)) { | |
1635 | /* nowhere to send the packet, just drop it */ | |
1636 | ppp->xmit_pending = NULL; | |
1637 | kfree_skb(skb); | |
1638 | return; | |
1639 | } | |
1640 | ||
1641 | if ((ppp->flags & SC_MULTILINK) == 0) { | |
1642 | /* not doing multilink: send it down the first channel */ | |
1643 | list = list->next; | |
1644 | pch = list_entry(list, struct channel, clist); | |
1645 | ||
97fcc193 | 1646 | spin_lock(&pch->downl); |
1da177e4 LT |
1647 | if (pch->chan) { |
1648 | if (pch->chan->ops->start_xmit(pch->chan, skb)) | |
1649 | ppp->xmit_pending = NULL; | |
1650 | } else { | |
1651 | /* channel got unregistered */ | |
1652 | kfree_skb(skb); | |
1653 | ppp->xmit_pending = NULL; | |
1654 | } | |
97fcc193 | 1655 | spin_unlock(&pch->downl); |
1da177e4 LT |
1656 | return; |
1657 | } | |
1658 | ||
1659 | #ifdef CONFIG_PPP_MULTILINK | |
1660 | /* Multilink: fragment the packet over as many links | |
1661 | as can take the packet at the moment. */ | |
1662 | if (!ppp_mp_explode(ppp, skb)) | |
1663 | return; | |
1664 | #endif /* CONFIG_PPP_MULTILINK */ | |
1665 | ||
1666 | ppp->xmit_pending = NULL; | |
1667 | kfree_skb(skb); | |
1668 | } | |
1669 | ||
1670 | #ifdef CONFIG_PPP_MULTILINK | |
d39cd5e9 | 1671 | static bool mp_protocol_compress __read_mostly = true; |
d61e4038 | 1672 | module_param(mp_protocol_compress, bool, 0644); |
d39cd5e9 | 1673 | MODULE_PARM_DESC(mp_protocol_compress, |
1674 | "compress protocol id in multilink fragments"); | |
1675 | ||
1da177e4 LT |
1676 | /* |
1677 | * Divide a packet to be transmitted into fragments and | |
1678 | * send them out the individual links. | |
1679 | */ | |
1680 | static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb) | |
1681 | { | |
fa44a73c LS |
1682 | int len, totlen; |
1683 | int i, bits, hdrlen, mtu; | |
1684 | int flen; | |
1685 | int navail, nfree, nzero; | |
1686 | int nbigger; | |
1687 | int totspeed; | |
1688 | int totfree; | |
1da177e4 LT |
1689 | unsigned char *p, *q; |
1690 | struct list_head *list; | |
1691 | struct channel *pch; | |
1692 | struct sk_buff *frag; | |
1693 | struct ppp_channel *chan; | |
1694 | ||
9c705260 | 1695 | totspeed = 0; /*total bitrate of the bundle*/ |
fa44a73c LS |
1696 | nfree = 0; /* # channels which have no packet already queued */ |
1697 | navail = 0; /* total # of usable channels (not deregistered) */ | |
1698 | nzero = 0; /* number of channels with zero speed associated*/ | |
1699 | totfree = 0; /*total # of channels available and | |
9c705260 GP |
1700 | *having no queued packets before |
1701 | *starting the fragmentation*/ | |
1702 | ||
1da177e4 | 1703 | hdrlen = (ppp->flags & SC_MP_XSHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN; |
fa44a73c LS |
1704 | i = 0; |
1705 | list_for_each_entry(pch, &ppp->channels, clist) { | |
3429769b DC |
1706 | if (pch->chan) { |
1707 | pch->avail = 1; | |
1708 | navail++; | |
1709 | pch->speed = pch->chan->speed; | |
1710 | } else { | |
1711 | pch->avail = 0; | |
1712 | } | |
fa44a73c | 1713 | if (pch->avail) { |
b03efcfb | 1714 | if (skb_queue_empty(&pch->file.xq) || |
fa44a73c | 1715 | !pch->had_frag) { |
9c705260 GP |
1716 | if (pch->speed == 0) |
1717 | nzero++; | |
1718 | else | |
1719 | totspeed += pch->speed; | |
1720 | ||
1721 | pch->avail = 2; | |
1722 | ++nfree; | |
1723 | ++totfree; | |
1724 | } | |
fa44a73c LS |
1725 | if (!pch->had_frag && i < ppp->nxchan) |
1726 | ppp->nxchan = i; | |
1da177e4 | 1727 | } |
516cd15f | 1728 | ++i; |
1da177e4 | 1729 | } |
516cd15f | 1730 | /* |
fa44a73c LS |
1731 | * Don't start sending this packet unless at least half of |
1732 | * the channels are free. This gives much better TCP | |
1733 | * performance if we have a lot of channels. | |
516cd15f | 1734 | */ |
fa44a73c LS |
1735 | if (nfree == 0 || nfree < navail / 2) |
1736 | return 0; /* can't take now, leave it in xmit_pending */ | |
1da177e4 | 1737 | |
d39cd5e9 | 1738 | /* Do protocol field compression */ |
fa44a73c LS |
1739 | p = skb->data; |
1740 | len = skb->len; | |
d39cd5e9 | 1741 | if (*p == 0 && mp_protocol_compress) { |
1da177e4 LT |
1742 | ++p; |
1743 | --len; | |
1744 | } | |
1745 | ||
9c705260 | 1746 | totlen = len; |
fa44a73c | 1747 | nbigger = len % nfree; |
9c705260 | 1748 | |
fa44a73c LS |
1749 | /* skip to the channel after the one we last used |
1750 | and start at that one */ | |
81616c5a | 1751 | list = &ppp->channels; |
fa44a73c | 1752 | for (i = 0; i < ppp->nxchan; ++i) { |
1da177e4 | 1753 | list = list->next; |
fa44a73c LS |
1754 | if (list == &ppp->channels) { |
1755 | i = 0; | |
1da177e4 LT |
1756 | break; |
1757 | } | |
1758 | } | |
1759 | ||
fa44a73c | 1760 | /* create a fragment for each channel */ |
1da177e4 | 1761 | bits = B; |
fa44a73c | 1762 | while (len > 0) { |
1da177e4 | 1763 | list = list->next; |
fa44a73c LS |
1764 | if (list == &ppp->channels) { |
1765 | i = 0; | |
1da177e4 LT |
1766 | continue; |
1767 | } | |
fa44a73c | 1768 | pch = list_entry(list, struct channel, clist); |
1da177e4 LT |
1769 | ++i; |
1770 | if (!pch->avail) | |
1771 | continue; | |
1772 | ||
516cd15f | 1773 | /* |
fa44a73c LS |
1774 | * Skip this channel if it has a fragment pending already and |
1775 | * we haven't given a fragment to all of the free channels. | |
516cd15f PM |
1776 | */ |
1777 | if (pch->avail == 1) { | |
fa44a73c | 1778 | if (nfree > 0) |
516cd15f PM |
1779 | continue; |
1780 | } else { | |
516cd15f PM |
1781 | pch->avail = 1; |
1782 | } | |
1783 | ||
1da177e4 | 1784 | /* check the channel's mtu and whether it is still attached. */ |
97fcc193 | 1785 | spin_lock(&pch->downl); |
516cd15f | 1786 | if (pch->chan == NULL) { |
fa44a73c | 1787 | /* can't use this channel, it's being deregistered */ |
9c705260 GP |
1788 | if (pch->speed == 0) |
1789 | nzero--; | |
1790 | else | |
fa44a73c | 1791 | totspeed -= pch->speed; |
9c705260 | 1792 | |
97fcc193 | 1793 | spin_unlock(&pch->downl); |
1da177e4 | 1794 | pch->avail = 0; |
9c705260 GP |
1795 | totlen = len; |
1796 | totfree--; | |
1797 | nfree--; | |
fa44a73c | 1798 | if (--navail == 0) |
1da177e4 LT |
1799 | break; |
1800 | continue; | |
1801 | } | |
1802 | ||
1803 | /* | |
9c705260 | 1804 | *if the channel speed is not set divide |
fa44a73c | 1805 | *the packet evenly among the free channels; |
9c705260 GP |
1806 | *otherwise divide it according to the speed |
1807 | *of the channel we are going to transmit on | |
1808 | */ | |
886f9fe6 | 1809 | flen = len; |
a53a8b56 BM |
1810 | if (nfree > 0) { |
1811 | if (pch->speed == 0) { | |
536e00e5 | 1812 | flen = len/nfree; |
a53a8b56 BM |
1813 | if (nbigger > 0) { |
1814 | flen++; | |
1815 | nbigger--; | |
1816 | } | |
1817 | } else { | |
1818 | flen = (((totfree - nzero)*(totlen + hdrlen*totfree)) / | |
1819 | ((totspeed*totfree)/pch->speed)) - hdrlen; | |
1820 | if (nbigger > 0) { | |
1821 | flen += ((totfree - nzero)*pch->speed)/totspeed; | |
1822 | nbigger -= ((totfree - nzero)*pch->speed)/ | |
9c705260 | 1823 | totspeed; |
a53a8b56 | 1824 | } |
9c705260 | 1825 | } |
a53a8b56 | 1826 | nfree--; |
9c705260 | 1827 | } |
9c705260 GP |
1828 | |
1829 | /* | |
fa44a73c | 1830 | *check if we are on the last channel or |
25985edc | 1831 | *we exceded the length of the data to |
9c705260 GP |
1832 | *fragment |
1833 | */ | |
a53a8b56 | 1834 | if ((nfree <= 0) || (flen > len)) |
9c705260 GP |
1835 | flen = len; |
1836 | /* | |
1837 | *it is not worth to tx on slow channels: | |
1838 | *in that case from the resulting flen according to the | |
1839 | *above formula will be equal or less than zero. | |
1840 | *Skip the channel in this case | |
1da177e4 | 1841 | */ |
fa44a73c | 1842 | if (flen <= 0) { |
9c705260 | 1843 | pch->avail = 2; |
97fcc193 | 1844 | spin_unlock(&pch->downl); |
9c705260 GP |
1845 | continue; |
1846 | } | |
1847 | ||
22e83a29 HW |
1848 | /* |
1849 | * hdrlen includes the 2-byte PPP protocol field, but the | |
1850 | * MTU counts only the payload excluding the protocol field. | |
1851 | * (RFC1661 Section 2) | |
1852 | */ | |
1853 | mtu = pch->chan->mtu - (hdrlen - 2); | |
fa44a73c LS |
1854 | if (mtu < 4) |
1855 | mtu = 4; | |
516cd15f PM |
1856 | if (flen > mtu) |
1857 | flen = mtu; | |
fa44a73c LS |
1858 | if (flen == len) |
1859 | bits |= E; | |
1860 | frag = alloc_skb(flen + hdrlen + (flen == 0), GFP_ATOMIC); | |
cd228d54 | 1861 | if (!frag) |
516cd15f | 1862 | goto noskb; |
fa44a73c | 1863 | q = skb_put(frag, flen + hdrlen); |
516cd15f | 1864 | |
fa44a73c | 1865 | /* make the MP header */ |
96545aeb | 1866 | put_unaligned_be16(PPP_MP, q); |
516cd15f | 1867 | if (ppp->flags & SC_MP_XSHORTSEQ) { |
fa44a73c | 1868 | q[2] = bits + ((ppp->nxseq >> 8) & 0xf); |
516cd15f PM |
1869 | q[3] = ppp->nxseq; |
1870 | } else { | |
1871 | q[2] = bits; | |
1872 | q[3] = ppp->nxseq >> 16; | |
1873 | q[4] = ppp->nxseq >> 8; | |
1874 | q[5] = ppp->nxseq; | |
1da177e4 | 1875 | } |
516cd15f | 1876 | |
9c705260 | 1877 | memcpy(q + hdrlen, p, flen); |
516cd15f PM |
1878 | |
1879 | /* try to send it down the channel */ | |
1880 | chan = pch->chan; | |
fa44a73c | 1881 | if (!skb_queue_empty(&pch->file.xq) || |
9c705260 | 1882 | !chan->ops->start_xmit(chan, frag)) |
516cd15f | 1883 | skb_queue_tail(&pch->file.xq, frag); |
fa44a73c | 1884 | pch->had_frag = 1; |
516cd15f | 1885 | p += flen; |
fa44a73c | 1886 | len -= flen; |
516cd15f PM |
1887 | ++ppp->nxseq; |
1888 | bits = 0; | |
97fcc193 | 1889 | spin_unlock(&pch->downl); |
516cd15f | 1890 | } |
fa44a73c | 1891 | ppp->nxchan = i; |
1da177e4 LT |
1892 | |
1893 | return 1; | |
1894 | ||
1895 | noskb: | |
97fcc193 | 1896 | spin_unlock(&pch->downl); |
1da177e4 | 1897 | if (ppp->debug & 1) |
b48f8c23 | 1898 | netdev_err(ppp->dev, "PPP: no memory (fragment)\n"); |
8c0469cd | 1899 | ++ppp->dev->stats.tx_errors; |
1da177e4 LT |
1900 | ++ppp->nxseq; |
1901 | return 1; /* abandon the frame */ | |
1902 | } | |
1903 | #endif /* CONFIG_PPP_MULTILINK */ | |
1904 | ||
55454a56 GN |
1905 | /* Try to send data out on a channel */ |
1906 | static void __ppp_channel_push(struct channel *pch) | |
1da177e4 LT |
1907 | { |
1908 | struct sk_buff *skb; | |
1909 | struct ppp *ppp; | |
1910 | ||
97fcc193 | 1911 | spin_lock(&pch->downl); |
cd228d54 | 1912 | if (pch->chan) { |
b03efcfb | 1913 | while (!skb_queue_empty(&pch->file.xq)) { |
1da177e4 LT |
1914 | skb = skb_dequeue(&pch->file.xq); |
1915 | if (!pch->chan->ops->start_xmit(pch->chan, skb)) { | |
1916 | /* put the packet back and try again later */ | |
1917 | skb_queue_head(&pch->file.xq, skb); | |
1918 | break; | |
1919 | } | |
1920 | } | |
1921 | } else { | |
1922 | /* channel got deregistered */ | |
1923 | skb_queue_purge(&pch->file.xq); | |
1924 | } | |
97fcc193 | 1925 | spin_unlock(&pch->downl); |
1da177e4 | 1926 | /* see if there is anything from the attached unit to be sent */ |
b03efcfb | 1927 | if (skb_queue_empty(&pch->file.xq)) { |
1da177e4 | 1928 | ppp = pch->ppp; |
cd228d54 | 1929 | if (ppp) |
6d066734 | 1930 | __ppp_xmit_process(ppp, NULL); |
1da177e4 LT |
1931 | } |
1932 | } | |
1933 | ||
55454a56 GN |
1934 | static void ppp_channel_push(struct channel *pch) |
1935 | { | |
0a0e1a85 GN |
1936 | read_lock_bh(&pch->upl); |
1937 | if (pch->ppp) { | |
1938 | (*this_cpu_ptr(pch->ppp->xmit_recursion))++; | |
1939 | __ppp_channel_push(pch); | |
1940 | (*this_cpu_ptr(pch->ppp->xmit_recursion))--; | |
1941 | } else { | |
1942 | __ppp_channel_push(pch); | |
1943 | } | |
1944 | read_unlock_bh(&pch->upl); | |
55454a56 GN |
1945 | } |
1946 | ||
1da177e4 LT |
1947 | /* |
1948 | * Receive-side routines. | |
1949 | */ | |
1950 | ||
a00eac0c DM |
1951 | struct ppp_mp_skb_parm { |
1952 | u32 sequence; | |
1953 | u8 BEbits; | |
1954 | }; | |
1955 | #define PPP_MP_CB(skb) ((struct ppp_mp_skb_parm *)((skb)->cb)) | |
1da177e4 LT |
1956 | |
1957 | static inline void | |
1958 | ppp_do_recv(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) | |
1959 | { | |
1960 | ppp_recv_lock(ppp); | |
739840d5 | 1961 | if (!ppp->closing) |
1da177e4 LT |
1962 | ppp_receive_frame(ppp, skb, pch); |
1963 | else | |
1964 | kfree_skb(skb); | |
1965 | ppp_recv_unlock(ppp); | |
1966 | } | |
1967 | ||
1968 | void | |
1969 | ppp_input(struct ppp_channel *chan, struct sk_buff *skb) | |
1970 | { | |
1971 | struct channel *pch = chan->ppp; | |
1972 | int proto; | |
1973 | ||
ea8420e9 | 1974 | if (!pch) { |
1da177e4 LT |
1975 | kfree_skb(skb); |
1976 | return; | |
1977 | } | |
516cd15f | 1978 | |
1da177e4 | 1979 | read_lock_bh(&pch->upl); |
ea8420e9 SA |
1980 | if (!pskb_may_pull(skb, 2)) { |
1981 | kfree_skb(skb); | |
1982 | if (pch->ppp) { | |
1983 | ++pch->ppp->dev->stats.rx_length_errors; | |
1984 | ppp_receive_error(pch->ppp); | |
1985 | } | |
1986 | goto done; | |
1987 | } | |
1988 | ||
1989 | proto = PPP_PROTO(skb); | |
cd228d54 | 1990 | if (!pch->ppp || proto >= 0xc000 || proto == PPP_CCPFRAG) { |
1da177e4 LT |
1991 | /* put it on the channel queue */ |
1992 | skb_queue_tail(&pch->file.rq, skb); | |
1993 | /* drop old frames if queue too long */ | |
8e95a202 JP |
1994 | while (pch->file.rq.qlen > PPP_MAX_RQLEN && |
1995 | (skb = skb_dequeue(&pch->file.rq))) | |
1da177e4 LT |
1996 | kfree_skb(skb); |
1997 | wake_up_interruptible(&pch->file.rwait); | |
1998 | } else { | |
1999 | ppp_do_recv(pch->ppp, skb, pch); | |
2000 | } | |
ea8420e9 SA |
2001 | |
2002 | done: | |
1da177e4 LT |
2003 | read_unlock_bh(&pch->upl); |
2004 | } | |
2005 | ||
2006 | /* Put a 0-length skb in the receive queue as an error indication */ | |
2007 | void | |
2008 | ppp_input_error(struct ppp_channel *chan, int code) | |
2009 | { | |
2010 | struct channel *pch = chan->ppp; | |
2011 | struct sk_buff *skb; | |
2012 | ||
cd228d54 | 2013 | if (!pch) |
1da177e4 LT |
2014 | return; |
2015 | ||
2016 | read_lock_bh(&pch->upl); | |
cd228d54 | 2017 | if (pch->ppp) { |
1da177e4 | 2018 | skb = alloc_skb(0, GFP_ATOMIC); |
cd228d54 | 2019 | if (skb) { |
1da177e4 LT |
2020 | skb->len = 0; /* probably unnecessary */ |
2021 | skb->cb[0] = code; | |
2022 | ppp_do_recv(pch->ppp, skb, pch); | |
2023 | } | |
2024 | } | |
2025 | read_unlock_bh(&pch->upl); | |
2026 | } | |
2027 | ||
2028 | /* | |
2029 | * We come in here to process a received frame. | |
2030 | * The receive side of the ppp unit is locked. | |
2031 | */ | |
2032 | static void | |
2033 | ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) | |
2034 | { | |
ea8420e9 SA |
2035 | /* note: a 0-length skb is used as an error indication */ |
2036 | if (skb->len > 0) { | |
3dfb0534 | 2037 | skb_checksum_complete_unset(skb); |
1da177e4 LT |
2038 | #ifdef CONFIG_PPP_MULTILINK |
2039 | /* XXX do channel-level decompression here */ | |
2040 | if (PPP_PROTO(skb) == PPP_MP) | |
2041 | ppp_receive_mp_frame(ppp, skb, pch); | |
2042 | else | |
2043 | #endif /* CONFIG_PPP_MULTILINK */ | |
2044 | ppp_receive_nonmp_frame(ppp, skb); | |
ea8420e9 SA |
2045 | } else { |
2046 | kfree_skb(skb); | |
2047 | ppp_receive_error(ppp); | |
1da177e4 | 2048 | } |
1da177e4 LT |
2049 | } |
2050 | ||
2051 | static void | |
2052 | ppp_receive_error(struct ppp *ppp) | |
2053 | { | |
8c0469cd | 2054 | ++ppp->dev->stats.rx_errors; |
cd228d54 | 2055 | if (ppp->vj) |
1da177e4 LT |
2056 | slhc_toss(ppp->vj); |
2057 | } | |
2058 | ||
2059 | static void | |
2060 | ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb) | |
2061 | { | |
2062 | struct sk_buff *ns; | |
2063 | int proto, len, npi; | |
2064 | ||
2065 | /* | |
2066 | * Decompress the frame, if compressed. | |
2067 | * Note that some decompressors need to see uncompressed frames | |
2068 | * that come in as well as compressed frames. | |
2069 | */ | |
8e95a202 JP |
2070 | if (ppp->rc_state && (ppp->rstate & SC_DECOMP_RUN) && |
2071 | (ppp->rstate & (SC_DC_FERROR | SC_DC_ERROR)) == 0) | |
1da177e4 LT |
2072 | skb = ppp_decompress_frame(ppp, skb); |
2073 | ||
b3f9b92a MD |
2074 | if (ppp->flags & SC_MUST_COMP && ppp->rstate & SC_DC_FERROR) |
2075 | goto err; | |
2076 | ||
1da177e4 LT |
2077 | proto = PPP_PROTO(skb); |
2078 | switch (proto) { | |
2079 | case PPP_VJC_COMP: | |
2080 | /* decompress VJ compressed packets */ | |
cd228d54 | 2081 | if (!ppp->vj || (ppp->flags & SC_REJ_COMP_TCP)) |
1da177e4 LT |
2082 | goto err; |
2083 | ||
2a38b775 | 2084 | if (skb_tailroom(skb) < 124 || skb_cloned(skb)) { |
1da177e4 LT |
2085 | /* copy to a new sk_buff with more tailroom */ |
2086 | ns = dev_alloc_skb(skb->len + 128); | |
cd228d54 | 2087 | if (!ns) { |
b48f8c23 DM |
2088 | netdev_err(ppp->dev, "PPP: no memory " |
2089 | "(VJ decomp)\n"); | |
1da177e4 LT |
2090 | goto err; |
2091 | } | |
2092 | skb_reserve(ns, 2); | |
2093 | skb_copy_bits(skb, 0, skb_put(ns, skb->len), skb->len); | |
968d7018 | 2094 | consume_skb(skb); |
1da177e4 LT |
2095 | skb = ns; |
2096 | } | |
e3f749c4 HX |
2097 | else |
2098 | skb->ip_summed = CHECKSUM_NONE; | |
1da177e4 LT |
2099 | |
2100 | len = slhc_uncompress(ppp->vj, skb->data + 2, skb->len - 2); | |
2101 | if (len <= 0) { | |
b48f8c23 DM |
2102 | netdev_printk(KERN_DEBUG, ppp->dev, |
2103 | "PPP: VJ decompression error\n"); | |
1da177e4 LT |
2104 | goto err; |
2105 | } | |
2106 | len += 2; | |
2107 | if (len > skb->len) | |
2108 | skb_put(skb, len - skb->len); | |
2109 | else if (len < skb->len) | |
2110 | skb_trim(skb, len); | |
2111 | proto = PPP_IP; | |
2112 | break; | |
2113 | ||
2114 | case PPP_VJC_UNCOMP: | |
cd228d54 | 2115 | if (!ppp->vj || (ppp->flags & SC_REJ_COMP_TCP)) |
1da177e4 | 2116 | goto err; |
6aa20a22 | 2117 | |
1da177e4 LT |
2118 | /* Until we fix the decompressor need to make sure |
2119 | * data portion is linear. | |
2120 | */ | |
6aa20a22 | 2121 | if (!pskb_may_pull(skb, skb->len)) |
1da177e4 LT |
2122 | goto err; |
2123 | ||
2124 | if (slhc_remember(ppp->vj, skb->data + 2, skb->len - 2) <= 0) { | |
b48f8c23 | 2125 | netdev_err(ppp->dev, "PPP: VJ uncompressed error\n"); |
1da177e4 LT |
2126 | goto err; |
2127 | } | |
2128 | proto = PPP_IP; | |
2129 | break; | |
2130 | ||
2131 | case PPP_CCP: | |
2132 | ppp_ccp_peek(ppp, skb, 1); | |
2133 | break; | |
2134 | } | |
2135 | ||
e51f6ff3 KG |
2136 | ++ppp->stats64.rx_packets; |
2137 | ppp->stats64.rx_bytes += skb->len - 2; | |
1da177e4 LT |
2138 | |
2139 | npi = proto_to_npindex(proto); | |
2140 | if (npi < 0) { | |
2141 | /* control or unknown frame - pass it to pppd */ | |
2142 | skb_queue_tail(&ppp->file.rq, skb); | |
2143 | /* limit queue length by dropping old frames */ | |
8e95a202 JP |
2144 | while (ppp->file.rq.qlen > PPP_MAX_RQLEN && |
2145 | (skb = skb_dequeue(&ppp->file.rq))) | |
1da177e4 LT |
2146 | kfree_skb(skb); |
2147 | /* wake up any process polling or blocking on read */ | |
2148 | wake_up_interruptible(&ppp->file.rwait); | |
2149 | ||
2150 | } else { | |
2151 | /* network protocol frame - give it to the kernel */ | |
2152 | ||
2153 | #ifdef CONFIG_PPP_FILTER | |
2154 | /* check if the packet passes the pass and active filters */ | |
2155 | /* the filter instructions are constructed assuming | |
2156 | a four-byte PPP header on each packet */ | |
2a38b775 | 2157 | if (ppp->pass_filter || ppp->active_filter) { |
14bbd6a5 | 2158 | if (skb_unclone(skb, GFP_ATOMIC)) |
2a38b775 HX |
2159 | goto err; |
2160 | ||
d58ff351 | 2161 | *(u8 *)skb_push(skb, 2) = 0; |
8e95a202 | 2162 | if (ppp->pass_filter && |
7ae457c1 | 2163 | BPF_PROG_RUN(ppp->pass_filter, skb) == 0) { |
2a38b775 | 2164 | if (ppp->debug & 1) |
b48f8c23 DM |
2165 | netdev_printk(KERN_DEBUG, ppp->dev, |
2166 | "PPP: inbound frame " | |
2167 | "not passed\n"); | |
2a38b775 HX |
2168 | kfree_skb(skb); |
2169 | return; | |
2170 | } | |
8e95a202 | 2171 | if (!(ppp->active_filter && |
7ae457c1 | 2172 | BPF_PROG_RUN(ppp->active_filter, skb) == 0)) |
2a38b775 HX |
2173 | ppp->last_recv = jiffies; |
2174 | __skb_pull(skb, 2); | |
2175 | } else | |
1da177e4 | 2176 | #endif /* CONFIG_PPP_FILTER */ |
2a38b775 | 2177 | ppp->last_recv = jiffies; |
1da177e4 | 2178 | |
8e95a202 JP |
2179 | if ((ppp->dev->flags & IFF_UP) == 0 || |
2180 | ppp->npmode[npi] != NPMODE_PASS) { | |
1da177e4 LT |
2181 | kfree_skb(skb); |
2182 | } else { | |
cbb042f9 HX |
2183 | /* chop off protocol */ |
2184 | skb_pull_rcsum(skb, 2); | |
1da177e4 LT |
2185 | skb->dev = ppp->dev; |
2186 | skb->protocol = htons(npindex_to_ethertype[npi]); | |
459a98ed | 2187 | skb_reset_mac_header(skb); |
79c441ae GN |
2188 | skb_scrub_packet(skb, !net_eq(ppp->ppp_net, |
2189 | dev_net(ppp->dev))); | |
1da177e4 | 2190 | netif_rx(skb); |
1da177e4 LT |
2191 | } |
2192 | } | |
2193 | return; | |
2194 | ||
2195 | err: | |
2196 | kfree_skb(skb); | |
2197 | ppp_receive_error(ppp); | |
2198 | } | |
2199 | ||
2200 | static struct sk_buff * | |
2201 | ppp_decompress_frame(struct ppp *ppp, struct sk_buff *skb) | |
2202 | { | |
2203 | int proto = PPP_PROTO(skb); | |
2204 | struct sk_buff *ns; | |
2205 | int len; | |
2206 | ||
2207 | /* Until we fix all the decompressor's need to make sure | |
2208 | * data portion is linear. | |
2209 | */ | |
2210 | if (!pskb_may_pull(skb, skb->len)) | |
2211 | goto err; | |
2212 | ||
2213 | if (proto == PPP_COMP) { | |
4b2a8fb3 KS |
2214 | int obuff_size; |
2215 | ||
2216 | switch(ppp->rcomp->compress_proto) { | |
2217 | case CI_MPPE: | |
2218 | obuff_size = ppp->mru + PPP_HDRLEN + 1; | |
2219 | break; | |
2220 | default: | |
2221 | obuff_size = ppp->mru + PPP_HDRLEN; | |
2222 | break; | |
2223 | } | |
2224 | ||
2225 | ns = dev_alloc_skb(obuff_size); | |
cd228d54 | 2226 | if (!ns) { |
b48f8c23 DM |
2227 | netdev_err(ppp->dev, "ppp_decompress_frame: " |
2228 | "no memory\n"); | |
1da177e4 LT |
2229 | goto err; |
2230 | } | |
2231 | /* the decompressor still expects the A/C bytes in the hdr */ | |
2232 | len = ppp->rcomp->decompress(ppp->rc_state, skb->data - 2, | |
06c7af56 | 2233 | skb->len + 2, ns->data, obuff_size); |
1da177e4 LT |
2234 | if (len < 0) { |
2235 | /* Pass the compressed frame to pppd as an | |
2236 | error indication. */ | |
2237 | if (len == DECOMP_FATALERROR) | |
2238 | ppp->rstate |= SC_DC_FERROR; | |
2239 | kfree_skb(ns); | |
2240 | goto err; | |
2241 | } | |
2242 | ||
968d7018 | 2243 | consume_skb(skb); |
1da177e4 LT |
2244 | skb = ns; |
2245 | skb_put(skb, len); | |
2246 | skb_pull(skb, 2); /* pull off the A/C bytes */ | |
2247 | ||
2248 | } else { | |
2249 | /* Uncompressed frame - pass to decompressor so it | |
2250 | can update its dictionary if necessary. */ | |
2251 | if (ppp->rcomp->incomp) | |
2252 | ppp->rcomp->incomp(ppp->rc_state, skb->data - 2, | |
2253 | skb->len + 2); | |
2254 | } | |
2255 | ||
2256 | return skb; | |
2257 | ||
2258 | err: | |
2259 | ppp->rstate |= SC_DC_ERROR; | |
2260 | ppp_receive_error(ppp); | |
2261 | return skb; | |
2262 | } | |
2263 | ||
2264 | #ifdef CONFIG_PPP_MULTILINK | |
2265 | /* | |
2266 | * Receive a multilink frame. | |
2267 | * We put it on the reconstruction queue and then pull off | |
2268 | * as many completed frames as we can. | |
2269 | */ | |
2270 | static void | |
2271 | ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) | |
2272 | { | |
2273 | u32 mask, seq; | |
81616c5a | 2274 | struct channel *ch; |
1da177e4 LT |
2275 | int mphdrlen = (ppp->flags & SC_MP_SHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN; |
2276 | ||
2a38b775 | 2277 | if (!pskb_may_pull(skb, mphdrlen + 1) || ppp->mrru == 0) |
1da177e4 LT |
2278 | goto err; /* no good, throw it away */ |
2279 | ||
2280 | /* Decode sequence number and begin/end bits */ | |
2281 | if (ppp->flags & SC_MP_SHORTSEQ) { | |
2282 | seq = ((skb->data[2] & 0x0f) << 8) | skb->data[3]; | |
2283 | mask = 0xfff; | |
2284 | } else { | |
2285 | seq = (skb->data[3] << 16) | (skb->data[4] << 8)| skb->data[5]; | |
2286 | mask = 0xffffff; | |
2287 | } | |
a00eac0c | 2288 | PPP_MP_CB(skb)->BEbits = skb->data[2]; |
1da177e4 LT |
2289 | skb_pull(skb, mphdrlen); /* pull off PPP and MP headers */ |
2290 | ||
2291 | /* | |
2292 | * Do protocol ID decompression on the first fragment of each packet. | |
2293 | */ | |
a00eac0c | 2294 | if ((PPP_MP_CB(skb)->BEbits & B) && (skb->data[0] & 1)) |
d58ff351 | 2295 | *(u8 *)skb_push(skb, 1) = 0; |
1da177e4 LT |
2296 | |
2297 | /* | |
2298 | * Expand sequence number to 32 bits, making it as close | |
2299 | * as possible to ppp->minseq. | |
2300 | */ | |
2301 | seq |= ppp->minseq & ~mask; | |
2302 | if ((int)(ppp->minseq - seq) > (int)(mask >> 1)) | |
2303 | seq += mask + 1; | |
2304 | else if ((int)(seq - ppp->minseq) > (int)(mask >> 1)) | |
2305 | seq -= mask + 1; /* should never happen */ | |
a00eac0c | 2306 | PPP_MP_CB(skb)->sequence = seq; |
1da177e4 LT |
2307 | pch->lastseq = seq; |
2308 | ||
2309 | /* | |
2310 | * If this packet comes before the next one we were expecting, | |
2311 | * drop it. | |
2312 | */ | |
2313 | if (seq_before(seq, ppp->nextseq)) { | |
2314 | kfree_skb(skb); | |
8c0469cd | 2315 | ++ppp->dev->stats.rx_dropped; |
1da177e4 LT |
2316 | ppp_receive_error(ppp); |
2317 | return; | |
2318 | } | |
2319 | ||
2320 | /* | |
2321 | * Reevaluate minseq, the minimum over all channels of the | |
2322 | * last sequence number received on each channel. Because of | |
2323 | * the increasing sequence number rule, we know that any fragment | |
2324 | * before `minseq' which hasn't arrived is never going to arrive. | |
2325 | * The list of channels can't change because we have the receive | |
2326 | * side of the ppp unit locked. | |
2327 | */ | |
81616c5a | 2328 | list_for_each_entry(ch, &ppp->channels, clist) { |
1da177e4 LT |
2329 | if (seq_before(ch->lastseq, seq)) |
2330 | seq = ch->lastseq; | |
2331 | } | |
2332 | if (seq_before(ppp->minseq, seq)) | |
2333 | ppp->minseq = seq; | |
2334 | ||
2335 | /* Put the fragment on the reconstruction queue */ | |
2336 | ppp_mp_insert(ppp, skb); | |
2337 | ||
2338 | /* If the queue is getting long, don't wait any longer for packets | |
2339 | before the start of the queue. */ | |
38ce7c73 | 2340 | if (skb_queue_len(&ppp->mrq) >= PPP_MP_MAX_QLEN) { |
c6b20d94 | 2341 | struct sk_buff *mskb = skb_peek(&ppp->mrq); |
a00eac0c DM |
2342 | if (seq_before(ppp->minseq, PPP_MP_CB(mskb)->sequence)) |
2343 | ppp->minseq = PPP_MP_CB(mskb)->sequence; | |
38ce7c73 | 2344 | } |
1da177e4 LT |
2345 | |
2346 | /* Pull completed packets off the queue and receive them. */ | |
82b3cc1a BM |
2347 | while ((skb = ppp_mp_reconstruct(ppp))) { |
2348 | if (pskb_may_pull(skb, 2)) | |
2349 | ppp_receive_nonmp_frame(ppp, skb); | |
2350 | else { | |
2351 | ++ppp->dev->stats.rx_length_errors; | |
2352 | kfree_skb(skb); | |
2353 | ppp_receive_error(ppp); | |
2354 | } | |
2355 | } | |
1da177e4 LT |
2356 | |
2357 | return; | |
2358 | ||
2359 | err: | |
2360 | kfree_skb(skb); | |
2361 | ppp_receive_error(ppp); | |
2362 | } | |
2363 | ||
2364 | /* | |
2365 | * Insert a fragment on the MP reconstruction queue. | |
2366 | * The queue is ordered by increasing sequence number. | |
2367 | */ | |
2368 | static void | |
2369 | ppp_mp_insert(struct ppp *ppp, struct sk_buff *skb) | |
2370 | { | |
2371 | struct sk_buff *p; | |
2372 | struct sk_buff_head *list = &ppp->mrq; | |
a00eac0c | 2373 | u32 seq = PPP_MP_CB(skb)->sequence; |
1da177e4 LT |
2374 | |
2375 | /* N.B. we don't need to lock the list lock because we have the | |
2376 | ppp unit receive-side lock. */ | |
13c9821e | 2377 | skb_queue_walk(list, p) { |
a00eac0c | 2378 | if (seq_before(seq, PPP_MP_CB(p)->sequence)) |
1da177e4 | 2379 | break; |
13c9821e | 2380 | } |
43f59c89 | 2381 | __skb_queue_before(list, p, skb); |
1da177e4 LT |
2382 | } |
2383 | ||
2384 | /* | |
2385 | * Reconstruct a packet from the MP fragment queue. | |
2386 | * We go through increasing sequence numbers until we find a | |
2387 | * complete packet, or we get to the sequence number for a fragment | |
2388 | * which hasn't arrived but might still do so. | |
2389 | */ | |
3c582b30 | 2390 | static struct sk_buff * |
1da177e4 LT |
2391 | ppp_mp_reconstruct(struct ppp *ppp) |
2392 | { | |
2393 | u32 seq = ppp->nextseq; | |
2394 | u32 minseq = ppp->minseq; | |
2395 | struct sk_buff_head *list = &ppp->mrq; | |
d52344a7 | 2396 | struct sk_buff *p, *tmp; |
1da177e4 LT |
2397 | struct sk_buff *head, *tail; |
2398 | struct sk_buff *skb = NULL; | |
2399 | int lost = 0, len = 0; | |
2400 | ||
2401 | if (ppp->mrru == 0) /* do nothing until mrru is set */ | |
2402 | return NULL; | |
2403 | head = list->next; | |
2404 | tail = NULL; | |
d52344a7 DM |
2405 | skb_queue_walk_safe(list, p, tmp) { |
2406 | again: | |
a00eac0c | 2407 | if (seq_before(PPP_MP_CB(p)->sequence, seq)) { |
1da177e4 | 2408 | /* this can't happen, anyway ignore the skb */ |
b48f8c23 DM |
2409 | netdev_err(ppp->dev, "ppp_mp_reconstruct bad " |
2410 | "seq %u < %u\n", | |
2411 | PPP_MP_CB(p)->sequence, seq); | |
d52344a7 DM |
2412 | __skb_unlink(p, list); |
2413 | kfree_skb(p); | |
1da177e4 LT |
2414 | continue; |
2415 | } | |
a00eac0c | 2416 | if (PPP_MP_CB(p)->sequence != seq) { |
8a49ad6e | 2417 | u32 oldseq; |
1da177e4 LT |
2418 | /* Fragment `seq' is missing. If it is after |
2419 | minseq, it might arrive later, so stop here. */ | |
2420 | if (seq_after(seq, minseq)) | |
2421 | break; | |
2422 | /* Fragment `seq' is lost, keep going. */ | |
2423 | lost = 1; | |
8a49ad6e | 2424 | oldseq = seq; |
a00eac0c DM |
2425 | seq = seq_before(minseq, PPP_MP_CB(p)->sequence)? |
2426 | minseq + 1: PPP_MP_CB(p)->sequence; | |
8a49ad6e BM |
2427 | |
2428 | if (ppp->debug & 1) | |
2429 | netdev_printk(KERN_DEBUG, ppp->dev, | |
2430 | "lost frag %u..%u\n", | |
2431 | oldseq, seq-1); | |
2432 | ||
d52344a7 | 2433 | goto again; |
1da177e4 LT |
2434 | } |
2435 | ||
2436 | /* | |
2437 | * At this point we know that all the fragments from | |
2438 | * ppp->nextseq to seq are either present or lost. | |
2439 | * Also, there are no complete packets in the queue | |
2440 | * that have no missing fragments and end before this | |
2441 | * fragment. | |
2442 | */ | |
2443 | ||
2444 | /* B bit set indicates this fragment starts a packet */ | |
a00eac0c | 2445 | if (PPP_MP_CB(p)->BEbits & B) { |
1da177e4 LT |
2446 | head = p; |
2447 | lost = 0; | |
2448 | len = 0; | |
2449 | } | |
2450 | ||
2451 | len += p->len; | |
2452 | ||
2453 | /* Got a complete packet yet? */ | |
a00eac0c DM |
2454 | if (lost == 0 && (PPP_MP_CB(p)->BEbits & E) && |
2455 | (PPP_MP_CB(head)->BEbits & B)) { | |
1da177e4 | 2456 | if (len > ppp->mrru + 2) { |
8c0469cd | 2457 | ++ppp->dev->stats.rx_length_errors; |
b48f8c23 DM |
2458 | netdev_printk(KERN_DEBUG, ppp->dev, |
2459 | "PPP: reconstructed packet" | |
2460 | " is too long (%d)\n", len); | |
1da177e4 LT |
2461 | } else { |
2462 | tail = p; | |
2463 | break; | |
2464 | } | |
2465 | ppp->nextseq = seq + 1; | |
2466 | } | |
2467 | ||
2468 | /* | |
2469 | * If this is the ending fragment of a packet, | |
2470 | * and we haven't found a complete valid packet yet, | |
2471 | * we can discard up to and including this fragment. | |
2472 | */ | |
d52344a7 DM |
2473 | if (PPP_MP_CB(p)->BEbits & E) { |
2474 | struct sk_buff *tmp2; | |
1da177e4 | 2475 | |
d52344a7 | 2476 | skb_queue_reverse_walk_from_safe(list, p, tmp2) { |
8a49ad6e BM |
2477 | if (ppp->debug & 1) |
2478 | netdev_printk(KERN_DEBUG, ppp->dev, | |
2479 | "discarding frag %u\n", | |
2480 | PPP_MP_CB(p)->sequence); | |
d52344a7 DM |
2481 | __skb_unlink(p, list); |
2482 | kfree_skb(p); | |
2483 | } | |
2484 | head = skb_peek(list); | |
2485 | if (!head) | |
2486 | break; | |
2487 | } | |
1da177e4 LT |
2488 | ++seq; |
2489 | } | |
2490 | ||
2491 | /* If we have a complete packet, copy it all into one skb. */ | |
2492 | if (tail != NULL) { | |
2493 | /* If we have discarded any fragments, | |
2494 | signal a receive error. */ | |
a00eac0c | 2495 | if (PPP_MP_CB(head)->sequence != ppp->nextseq) { |
8a49ad6e BM |
2496 | skb_queue_walk_safe(list, p, tmp) { |
2497 | if (p == head) | |
2498 | break; | |
2499 | if (ppp->debug & 1) | |
2500 | netdev_printk(KERN_DEBUG, ppp->dev, | |
2501 | "discarding frag %u\n", | |
2502 | PPP_MP_CB(p)->sequence); | |
2503 | __skb_unlink(p, list); | |
2504 | kfree_skb(p); | |
2505 | } | |
2506 | ||
1da177e4 | 2507 | if (ppp->debug & 1) |
b48f8c23 DM |
2508 | netdev_printk(KERN_DEBUG, ppp->dev, |
2509 | " missed pkts %u..%u\n", | |
2510 | ppp->nextseq, | |
2511 | PPP_MP_CB(head)->sequence-1); | |
8c0469cd | 2512 | ++ppp->dev->stats.rx_dropped; |
1da177e4 LT |
2513 | ppp_receive_error(ppp); |
2514 | } | |
2515 | ||
212bfb9e DM |
2516 | skb = head; |
2517 | if (head != tail) { | |
2518 | struct sk_buff **fragpp = &skb_shinfo(skb)->frag_list; | |
2519 | p = skb_queue_next(list, head); | |
2520 | __skb_unlink(skb, list); | |
2521 | skb_queue_walk_from_safe(list, p, tmp) { | |
2522 | __skb_unlink(p, list); | |
2523 | *fragpp = p; | |
2524 | p->next = NULL; | |
2525 | fragpp = &p->next; | |
2526 | ||
2527 | skb->len += p->len; | |
2528 | skb->data_len += p->len; | |
19c6c8f5 | 2529 | skb->truesize += p->truesize; |
212bfb9e DM |
2530 | |
2531 | if (p == tail) | |
2532 | break; | |
2533 | } | |
2534 | } else { | |
2535 | __skb_unlink(skb, list); | |
2536 | } | |
2537 | ||
a00eac0c | 2538 | ppp->nextseq = PPP_MP_CB(tail)->sequence + 1; |
1da177e4 LT |
2539 | } |
2540 | ||
2541 | return skb; | |
2542 | } | |
2543 | #endif /* CONFIG_PPP_MULTILINK */ | |
2544 | ||
2545 | /* | |
2546 | * Channel interface. | |
2547 | */ | |
2548 | ||
273ec51d CG |
2549 | /* Create a new, unattached ppp channel. */ |
2550 | int ppp_register_channel(struct ppp_channel *chan) | |
2551 | { | |
2552 | return ppp_register_net_channel(current->nsproxy->net_ns, chan); | |
2553 | } | |
2554 | ||
2555 | /* Create a new, unattached ppp channel for specified net. */ | |
2556 | int ppp_register_net_channel(struct net *net, struct ppp_channel *chan) | |
1da177e4 LT |
2557 | { |
2558 | struct channel *pch; | |
273ec51d | 2559 | struct ppp_net *pn; |
1da177e4 | 2560 | |
d4274b51 | 2561 | pch = kzalloc(sizeof(struct channel), GFP_KERNEL); |
cd228d54 | 2562 | if (!pch) |
1da177e4 | 2563 | return -ENOMEM; |
273ec51d CG |
2564 | |
2565 | pn = ppp_pernet(net); | |
2566 | ||
1da177e4 LT |
2567 | pch->ppp = NULL; |
2568 | pch->chan = chan; | |
1f461dcd | 2569 | pch->chan_net = get_net(net); |
1da177e4 LT |
2570 | chan->ppp = pch; |
2571 | init_ppp_file(&pch->file, CHANNEL); | |
2572 | pch->file.hdrlen = chan->hdrlen; | |
2573 | #ifdef CONFIG_PPP_MULTILINK | |
2574 | pch->lastseq = -1; | |
2575 | #endif /* CONFIG_PPP_MULTILINK */ | |
2576 | init_rwsem(&pch->chan_sem); | |
2577 | spin_lock_init(&pch->downl); | |
2578 | rwlock_init(&pch->upl); | |
273ec51d CG |
2579 | |
2580 | spin_lock_bh(&pn->all_channels_lock); | |
2581 | pch->file.index = ++pn->last_channel_index; | |
2582 | list_add(&pch->list, &pn->new_channels); | |
1da177e4 | 2583 | atomic_inc(&channel_count); |
273ec51d CG |
2584 | spin_unlock_bh(&pn->all_channels_lock); |
2585 | ||
1da177e4 LT |
2586 | return 0; |
2587 | } | |
2588 | ||
2589 | /* | |
2590 | * Return the index of a channel. | |
2591 | */ | |
2592 | int ppp_channel_index(struct ppp_channel *chan) | |
2593 | { | |
2594 | struct channel *pch = chan->ppp; | |
2595 | ||
cd228d54 | 2596 | if (pch) |
1da177e4 LT |
2597 | return pch->file.index; |
2598 | return -1; | |
2599 | } | |
2600 | ||
2601 | /* | |
2602 | * Return the PPP unit number to which a channel is connected. | |
2603 | */ | |
2604 | int ppp_unit_number(struct ppp_channel *chan) | |
2605 | { | |
2606 | struct channel *pch = chan->ppp; | |
2607 | int unit = -1; | |
2608 | ||
cd228d54 | 2609 | if (pch) { |
1da177e4 | 2610 | read_lock_bh(&pch->upl); |
cd228d54 | 2611 | if (pch->ppp) |
1da177e4 LT |
2612 | unit = pch->ppp->file.index; |
2613 | read_unlock_bh(&pch->upl); | |
2614 | } | |
2615 | return unit; | |
2616 | } | |
2617 | ||
63f96072 JC |
2618 | /* |
2619 | * Return the PPP device interface name of a channel. | |
2620 | */ | |
2621 | char *ppp_dev_name(struct ppp_channel *chan) | |
2622 | { | |
2623 | struct channel *pch = chan->ppp; | |
2624 | char *name = NULL; | |
2625 | ||
2626 | if (pch) { | |
2627 | read_lock_bh(&pch->upl); | |
2628 | if (pch->ppp && pch->ppp->dev) | |
2629 | name = pch->ppp->dev->name; | |
2630 | read_unlock_bh(&pch->upl); | |
2631 | } | |
2632 | return name; | |
2633 | } | |
2634 | ||
2635 | ||
1da177e4 LT |
2636 | /* |
2637 | * Disconnect a channel from the generic layer. | |
2638 | * This must be called in process context. | |
2639 | */ | |
2640 | void | |
2641 | ppp_unregister_channel(struct ppp_channel *chan) | |
2642 | { | |
2643 | struct channel *pch = chan->ppp; | |
273ec51d | 2644 | struct ppp_net *pn; |
1da177e4 | 2645 | |
cd228d54 | 2646 | if (!pch) |
1da177e4 | 2647 | return; /* should never happen */ |
273ec51d | 2648 | |
1da177e4 LT |
2649 | chan->ppp = NULL; |
2650 | ||
2651 | /* | |
2652 | * This ensures that we have returned from any calls into the | |
2653 | * the channel's start_xmit or ioctl routine before we proceed. | |
2654 | */ | |
2655 | down_write(&pch->chan_sem); | |
2656 | spin_lock_bh(&pch->downl); | |
2657 | pch->chan = NULL; | |
2658 | spin_unlock_bh(&pch->downl); | |
2659 | up_write(&pch->chan_sem); | |
2660 | ppp_disconnect_channel(pch); | |
273ec51d CG |
2661 | |
2662 | pn = ppp_pernet(pch->chan_net); | |
2663 | spin_lock_bh(&pn->all_channels_lock); | |
1da177e4 | 2664 | list_del(&pch->list); |
273ec51d CG |
2665 | spin_unlock_bh(&pn->all_channels_lock); |
2666 | ||
1da177e4 LT |
2667 | pch->file.dead = 1; |
2668 | wake_up_interruptible(&pch->file.rwait); | |
d780cd44 | 2669 | if (refcount_dec_and_test(&pch->file.refcnt)) |
1da177e4 LT |
2670 | ppp_destroy_channel(pch); |
2671 | } | |
2672 | ||
2673 | /* | |
2674 | * Callback from a channel when it can accept more to transmit. | |
2675 | * This should be called at BH/softirq level, not interrupt level. | |
2676 | */ | |
2677 | void | |
2678 | ppp_output_wakeup(struct ppp_channel *chan) | |
2679 | { | |
2680 | struct channel *pch = chan->ppp; | |
2681 | ||
cd228d54 | 2682 | if (!pch) |
1da177e4 LT |
2683 | return; |
2684 | ppp_channel_push(pch); | |
2685 | } | |
2686 | ||
2687 | /* | |
2688 | * Compression control. | |
2689 | */ | |
2690 | ||
2691 | /* Process the PPPIOCSCOMPRESS ioctl. */ | |
2692 | static int | |
2693 | ppp_set_compress(struct ppp *ppp, unsigned long arg) | |
2694 | { | |
2695 | int err; | |
2696 | struct compressor *cp, *ocomp; | |
2697 | struct ppp_option_data data; | |
2698 | void *state, *ostate; | |
2699 | unsigned char ccp_option[CCP_MAX_OPTION_LENGTH]; | |
2700 | ||
2701 | err = -EFAULT; | |
555d5b70 | 2702 | if (copy_from_user(&data, (void __user *) arg, sizeof(data))) |
1da177e4 | 2703 | goto out; |
555d5b70 GN |
2704 | if (data.length > CCP_MAX_OPTION_LENGTH) |
2705 | goto out; | |
2706 | if (copy_from_user(ccp_option, (void __user *) data.ptr, data.length)) | |
2707 | goto out; | |
2708 | ||
1da177e4 | 2709 | err = -EINVAL; |
555d5b70 | 2710 | if (data.length < 2 || ccp_option[1] < 2 || ccp_option[1] > data.length) |
1da177e4 LT |
2711 | goto out; |
2712 | ||
a65e5d78 JB |
2713 | cp = try_then_request_module( |
2714 | find_compressor(ccp_option[0]), | |
2715 | "ppp-compress-%d", ccp_option[0]); | |
cd228d54 | 2716 | if (!cp) |
1da177e4 LT |
2717 | goto out; |
2718 | ||
2719 | err = -ENOBUFS; | |
2720 | if (data.transmit) { | |
2721 | state = cp->comp_alloc(ccp_option, data.length); | |
cd228d54 | 2722 | if (state) { |
1da177e4 LT |
2723 | ppp_xmit_lock(ppp); |
2724 | ppp->xstate &= ~SC_COMP_RUN; | |
2725 | ocomp = ppp->xcomp; | |
2726 | ostate = ppp->xc_state; | |
2727 | ppp->xcomp = cp; | |
2728 | ppp->xc_state = state; | |
2729 | ppp_xmit_unlock(ppp); | |
cd228d54 | 2730 | if (ostate) { |
1da177e4 LT |
2731 | ocomp->comp_free(ostate); |
2732 | module_put(ocomp->owner); | |
2733 | } | |
2734 | err = 0; | |
2735 | } else | |
2736 | module_put(cp->owner); | |
2737 | ||
2738 | } else { | |
2739 | state = cp->decomp_alloc(ccp_option, data.length); | |
cd228d54 | 2740 | if (state) { |
1da177e4 LT |
2741 | ppp_recv_lock(ppp); |
2742 | ppp->rstate &= ~SC_DECOMP_RUN; | |
2743 | ocomp = ppp->rcomp; | |
2744 | ostate = ppp->rc_state; | |
2745 | ppp->rcomp = cp; | |
2746 | ppp->rc_state = state; | |
2747 | ppp_recv_unlock(ppp); | |
cd228d54 | 2748 | if (ostate) { |
1da177e4 LT |
2749 | ocomp->decomp_free(ostate); |
2750 | module_put(ocomp->owner); | |
2751 | } | |
2752 | err = 0; | |
2753 | } else | |
2754 | module_put(cp->owner); | |
2755 | } | |
2756 | ||
2757 | out: | |
2758 | return err; | |
2759 | } | |
2760 | ||
2761 | /* | |
2762 | * Look at a CCP packet and update our state accordingly. | |
2763 | * We assume the caller has the xmit or recv path locked. | |
2764 | */ | |
2765 | static void | |
2766 | ppp_ccp_peek(struct ppp *ppp, struct sk_buff *skb, int inbound) | |
2767 | { | |
2768 | unsigned char *dp; | |
2769 | int len; | |
2770 | ||
2771 | if (!pskb_may_pull(skb, CCP_HDRLEN + 2)) | |
2772 | return; /* no header */ | |
2773 | dp = skb->data + 2; | |
2774 | ||
2775 | switch (CCP_CODE(dp)) { | |
2776 | case CCP_CONFREQ: | |
2777 | ||
6aa20a22 | 2778 | /* A ConfReq starts negotiation of compression |
1da177e4 LT |
2779 | * in one direction of transmission, |
2780 | * and hence brings it down...but which way? | |
2781 | * | |
2782 | * Remember: | |
2783 | * A ConfReq indicates what the sender would like to receive | |
2784 | */ | |
2785 | if(inbound) | |
2786 | /* He is proposing what I should send */ | |
2787 | ppp->xstate &= ~SC_COMP_RUN; | |
6aa20a22 | 2788 | else |
1da177e4 LT |
2789 | /* I am proposing to what he should send */ |
2790 | ppp->rstate &= ~SC_DECOMP_RUN; | |
6aa20a22 | 2791 | |
1da177e4 | 2792 | break; |
6aa20a22 | 2793 | |
1da177e4 LT |
2794 | case CCP_TERMREQ: |
2795 | case CCP_TERMACK: | |
2796 | /* | |
6aa20a22 | 2797 | * CCP is going down, both directions of transmission |
1da177e4 LT |
2798 | */ |
2799 | ppp->rstate &= ~SC_DECOMP_RUN; | |
2800 | ppp->xstate &= ~SC_COMP_RUN; | |
2801 | break; | |
2802 | ||
2803 | case CCP_CONFACK: | |
2804 | if ((ppp->flags & (SC_CCP_OPEN | SC_CCP_UP)) != SC_CCP_OPEN) | |
2805 | break; | |
2806 | len = CCP_LENGTH(dp); | |
2807 | if (!pskb_may_pull(skb, len + 2)) | |
2808 | return; /* too short */ | |
2809 | dp += CCP_HDRLEN; | |
2810 | len -= CCP_HDRLEN; | |
2811 | if (len < CCP_OPT_MINLEN || len < CCP_OPT_LENGTH(dp)) | |
2812 | break; | |
2813 | if (inbound) { | |
2814 | /* we will start receiving compressed packets */ | |
cd228d54 | 2815 | if (!ppp->rc_state) |
1da177e4 LT |
2816 | break; |
2817 | if (ppp->rcomp->decomp_init(ppp->rc_state, dp, len, | |
2818 | ppp->file.index, 0, ppp->mru, ppp->debug)) { | |
2819 | ppp->rstate |= SC_DECOMP_RUN; | |
2820 | ppp->rstate &= ~(SC_DC_ERROR | SC_DC_FERROR); | |
2821 | } | |
2822 | } else { | |
2823 | /* we will soon start sending compressed packets */ | |
cd228d54 | 2824 | if (!ppp->xc_state) |
1da177e4 LT |
2825 | break; |
2826 | if (ppp->xcomp->comp_init(ppp->xc_state, dp, len, | |
2827 | ppp->file.index, 0, ppp->debug)) | |
2828 | ppp->xstate |= SC_COMP_RUN; | |
2829 | } | |
2830 | break; | |
2831 | ||
2832 | case CCP_RESETACK: | |
2833 | /* reset the [de]compressor */ | |
2834 | if ((ppp->flags & SC_CCP_UP) == 0) | |
2835 | break; | |
2836 | if (inbound) { | |
2837 | if (ppp->rc_state && (ppp->rstate & SC_DECOMP_RUN)) { | |
2838 | ppp->rcomp->decomp_reset(ppp->rc_state); | |
2839 | ppp->rstate &= ~SC_DC_ERROR; | |
2840 | } | |
2841 | } else { | |
2842 | if (ppp->xc_state && (ppp->xstate & SC_COMP_RUN)) | |
2843 | ppp->xcomp->comp_reset(ppp->xc_state); | |
2844 | } | |
2845 | break; | |
2846 | } | |
2847 | } | |
2848 | ||
2849 | /* Free up compression resources. */ | |
2850 | static void | |
2851 | ppp_ccp_closed(struct ppp *ppp) | |
2852 | { | |
2853 | void *xstate, *rstate; | |
2854 | struct compressor *xcomp, *rcomp; | |
2855 | ||
2856 | ppp_lock(ppp); | |
2857 | ppp->flags &= ~(SC_CCP_OPEN | SC_CCP_UP); | |
2858 | ppp->xstate = 0; | |
2859 | xcomp = ppp->xcomp; | |
2860 | xstate = ppp->xc_state; | |
2861 | ppp->xc_state = NULL; | |
2862 | ppp->rstate = 0; | |
2863 | rcomp = ppp->rcomp; | |
2864 | rstate = ppp->rc_state; | |
2865 | ppp->rc_state = NULL; | |
2866 | ppp_unlock(ppp); | |
2867 | ||
2868 | if (xstate) { | |
2869 | xcomp->comp_free(xstate); | |
2870 | module_put(xcomp->owner); | |
2871 | } | |
2872 | if (rstate) { | |
2873 | rcomp->decomp_free(rstate); | |
2874 | module_put(rcomp->owner); | |
2875 | } | |
2876 | } | |
2877 | ||
2878 | /* List of compressors. */ | |
2879 | static LIST_HEAD(compressor_list); | |
2880 | static DEFINE_SPINLOCK(compressor_list_lock); | |
2881 | ||
2882 | struct compressor_entry { | |
2883 | struct list_head list; | |
2884 | struct compressor *comp; | |
2885 | }; | |
2886 | ||
2887 | static struct compressor_entry * | |
2888 | find_comp_entry(int proto) | |
2889 | { | |
2890 | struct compressor_entry *ce; | |
1da177e4 | 2891 | |
81616c5a | 2892 | list_for_each_entry(ce, &compressor_list, list) { |
1da177e4 LT |
2893 | if (ce->comp->compress_proto == proto) |
2894 | return ce; | |
2895 | } | |
2896 | return NULL; | |
2897 | } | |
2898 | ||
2899 | /* Register a compressor */ | |
2900 | int | |
2901 | ppp_register_compressor(struct compressor *cp) | |
2902 | { | |
2903 | struct compressor_entry *ce; | |
2904 | int ret; | |
2905 | spin_lock(&compressor_list_lock); | |
2906 | ret = -EEXIST; | |
cd228d54 | 2907 | if (find_comp_entry(cp->compress_proto)) |
1da177e4 LT |
2908 | goto out; |
2909 | ret = -ENOMEM; | |
2910 | ce = kmalloc(sizeof(struct compressor_entry), GFP_ATOMIC); | |
cd228d54 | 2911 | if (!ce) |
1da177e4 LT |
2912 | goto out; |
2913 | ret = 0; | |
2914 | ce->comp = cp; | |
2915 | list_add(&ce->list, &compressor_list); | |
2916 | out: | |
2917 | spin_unlock(&compressor_list_lock); | |
2918 | return ret; | |
2919 | } | |
2920 | ||
2921 | /* Unregister a compressor */ | |
2922 | void | |
2923 | ppp_unregister_compressor(struct compressor *cp) | |
2924 | { | |
2925 | struct compressor_entry *ce; | |
2926 | ||
2927 | spin_lock(&compressor_list_lock); | |
2928 | ce = find_comp_entry(cp->compress_proto); | |
cd228d54 | 2929 | if (ce && ce->comp == cp) { |
1da177e4 LT |
2930 | list_del(&ce->list); |
2931 | kfree(ce); | |
2932 | } | |
2933 | spin_unlock(&compressor_list_lock); | |
2934 | } | |
2935 | ||
2936 | /* Find a compressor. */ | |
2937 | static struct compressor * | |
2938 | find_compressor(int type) | |
2939 | { | |
2940 | struct compressor_entry *ce; | |
2941 | struct compressor *cp = NULL; | |
2942 | ||
2943 | spin_lock(&compressor_list_lock); | |
2944 | ce = find_comp_entry(type); | |
cd228d54 | 2945 | if (ce) { |
1da177e4 LT |
2946 | cp = ce->comp; |
2947 | if (!try_module_get(cp->owner)) | |
2948 | cp = NULL; | |
2949 | } | |
2950 | spin_unlock(&compressor_list_lock); | |
2951 | return cp; | |
2952 | } | |
2953 | ||
2954 | /* | |
2955 | * Miscelleneous stuff. | |
2956 | */ | |
2957 | ||
2958 | static void | |
2959 | ppp_get_stats(struct ppp *ppp, struct ppp_stats *st) | |
2960 | { | |
2961 | struct slcompress *vj = ppp->vj; | |
2962 | ||
2963 | memset(st, 0, sizeof(*st)); | |
e51f6ff3 | 2964 | st->p.ppp_ipackets = ppp->stats64.rx_packets; |
8c0469cd | 2965 | st->p.ppp_ierrors = ppp->dev->stats.rx_errors; |
e51f6ff3 KG |
2966 | st->p.ppp_ibytes = ppp->stats64.rx_bytes; |
2967 | st->p.ppp_opackets = ppp->stats64.tx_packets; | |
8c0469cd | 2968 | st->p.ppp_oerrors = ppp->dev->stats.tx_errors; |
e51f6ff3 | 2969 | st->p.ppp_obytes = ppp->stats64.tx_bytes; |
cd228d54 | 2970 | if (!vj) |
1da177e4 LT |
2971 | return; |
2972 | st->vj.vjs_packets = vj->sls_o_compressed + vj->sls_o_uncompressed; | |
2973 | st->vj.vjs_compressed = vj->sls_o_compressed; | |
2974 | st->vj.vjs_searches = vj->sls_o_searches; | |
2975 | st->vj.vjs_misses = vj->sls_o_misses; | |
2976 | st->vj.vjs_errorin = vj->sls_i_error; | |
2977 | st->vj.vjs_tossed = vj->sls_i_tossed; | |
2978 | st->vj.vjs_uncompressedin = vj->sls_i_uncompressed; | |
2979 | st->vj.vjs_compressedin = vj->sls_i_compressed; | |
2980 | } | |
2981 | ||
2982 | /* | |
2983 | * Stuff for handling the lists of ppp units and channels | |
2984 | * and for initialization. | |
2985 | */ | |
2986 | ||
2987 | /* | |
2988 | * Create a new ppp interface unit. Fails if it can't allocate memory | |
2989 | * or if there is already a unit with the requested number. | |
2990 | * unit == -1 means allocate a new number. | |
2991 | */ | |
7d9f0b48 | 2992 | static int ppp_create_interface(struct net *net, struct file *file, int *unit) |
1da177e4 | 2993 | { |
7d9f0b48 GN |
2994 | struct ppp_config conf = { |
2995 | .file = file, | |
2996 | .unit = *unit, | |
96d934c7 | 2997 | .ifname_is_set = false, |
7d9f0b48 GN |
2998 | }; |
2999 | struct net_device *dev; | |
1da177e4 | 3000 | struct ppp *ppp; |
7d9f0b48 | 3001 | int err; |
1da177e4 | 3002 | |
69d9728d | 3003 | dev = alloc_netdev(sizeof(struct ppp), "", NET_NAME_ENUM, ppp_setup); |
7d9f0b48 GN |
3004 | if (!dev) { |
3005 | err = -ENOMEM; | |
3006 | goto err; | |
3007 | } | |
273ec51d | 3008 | dev_net_set(dev, net); |
96d934c7 | 3009 | dev->rtnl_link_ops = &ppp_link_ops; |
273ec51d | 3010 | |
58a89eca | 3011 | rtnl_lock(); |
1da177e4 | 3012 | |
7d9f0b48 GN |
3013 | err = ppp_dev_configure(net, dev, &conf); |
3014 | if (err < 0) | |
3015 | goto err_dev; | |
3016 | ppp = netdev_priv(dev); | |
3017 | *unit = ppp->file.index; | |
273ec51d | 3018 | |
58a89eca | 3019 | rtnl_unlock(); |
7a95d267 | 3020 | |
7d9f0b48 | 3021 | return 0; |
1da177e4 | 3022 | |
7d9f0b48 | 3023 | err_dev: |
6faac63a | 3024 | rtnl_unlock(); |
1da177e4 | 3025 | free_netdev(dev); |
7d9f0b48 GN |
3026 | err: |
3027 | return err; | |
1da177e4 LT |
3028 | } |
3029 | ||
3030 | /* | |
3031 | * Initialize a ppp_file structure. | |
3032 | */ | |
3033 | static void | |
3034 | init_ppp_file(struct ppp_file *pf, int kind) | |
3035 | { | |
3036 | pf->kind = kind; | |
3037 | skb_queue_head_init(&pf->xq); | |
3038 | skb_queue_head_init(&pf->rq); | |
d780cd44 | 3039 | refcount_set(&pf->refcnt, 1); |
1da177e4 LT |
3040 | init_waitqueue_head(&pf->rwait); |
3041 | } | |
3042 | ||
1da177e4 LT |
3043 | /* |
3044 | * Free the memory used by a ppp unit. This is only called once | |
3045 | * there are no channels connected to the unit and no file structs | |
3046 | * that reference the unit. | |
3047 | */ | |
3048 | static void ppp_destroy_interface(struct ppp *ppp) | |
3049 | { | |
3050 | atomic_dec(&ppp_unit_count); | |
3051 | ||
3052 | if (!ppp->file.dead || ppp->n_channels) { | |
3053 | /* "can't happen" */ | |
b48f8c23 DM |
3054 | netdev_err(ppp->dev, "ppp: destroying ppp struct %p " |
3055 | "but dead=%d n_channels=%d !\n", | |
3056 | ppp, ppp->file.dead, ppp->n_channels); | |
1da177e4 LT |
3057 | return; |
3058 | } | |
3059 | ||
3060 | ppp_ccp_closed(ppp); | |
3061 | if (ppp->vj) { | |
3062 | slhc_free(ppp->vj); | |
3063 | ppp->vj = NULL; | |
3064 | } | |
3065 | skb_queue_purge(&ppp->file.xq); | |
3066 | skb_queue_purge(&ppp->file.rq); | |
3067 | #ifdef CONFIG_PPP_MULTILINK | |
3068 | skb_queue_purge(&ppp->mrq); | |
3069 | #endif /* CONFIG_PPP_MULTILINK */ | |
3070 | #ifdef CONFIG_PPP_FILTER | |
568f194e | 3071 | if (ppp->pass_filter) { |
7ae457c1 | 3072 | bpf_prog_destroy(ppp->pass_filter); |
568f194e DB |
3073 | ppp->pass_filter = NULL; |
3074 | } | |
3075 | ||
3076 | if (ppp->active_filter) { | |
7ae457c1 | 3077 | bpf_prog_destroy(ppp->active_filter); |
568f194e DB |
3078 | ppp->active_filter = NULL; |
3079 | } | |
1da177e4 LT |
3080 | #endif /* CONFIG_PPP_FILTER */ |
3081 | ||
1d2f8c95 | 3082 | kfree_skb(ppp->xmit_pending); |
e5dadc65 | 3083 | free_percpu(ppp->xmit_recursion); |
165de5b7 | 3084 | |
739840d5 | 3085 | free_netdev(ppp->dev); |
1da177e4 LT |
3086 | } |
3087 | ||
3088 | /* | |
3089 | * Locate an existing ppp unit. | |
8ed965d6 | 3090 | * The caller should have locked the all_ppp_mutex. |
1da177e4 LT |
3091 | */ |
3092 | static struct ppp * | |
273ec51d | 3093 | ppp_find_unit(struct ppp_net *pn, int unit) |
1da177e4 | 3094 | { |
273ec51d | 3095 | return unit_find(&pn->units_idr, unit); |
1da177e4 LT |
3096 | } |
3097 | ||
3098 | /* | |
3099 | * Locate an existing ppp channel. | |
3100 | * The caller should have locked the all_channels_lock. | |
3101 | * First we look in the new_channels list, then in the | |
3102 | * all_channels list. If found in the new_channels list, | |
3103 | * we move it to the all_channels list. This is for speed | |
3104 | * when we have a lot of channels in use. | |
3105 | */ | |
3106 | static struct channel * | |
273ec51d | 3107 | ppp_find_channel(struct ppp_net *pn, int unit) |
1da177e4 LT |
3108 | { |
3109 | struct channel *pch; | |
1da177e4 | 3110 | |
273ec51d | 3111 | list_for_each_entry(pch, &pn->new_channels, list) { |
1da177e4 | 3112 | if (pch->file.index == unit) { |
273ec51d | 3113 | list_move(&pch->list, &pn->all_channels); |
1da177e4 LT |
3114 | return pch; |
3115 | } | |
3116 | } | |
273ec51d CG |
3117 | |
3118 | list_for_each_entry(pch, &pn->all_channels, list) { | |
1da177e4 LT |
3119 | if (pch->file.index == unit) |
3120 | return pch; | |
3121 | } | |
273ec51d | 3122 | |
1da177e4 LT |
3123 | return NULL; |
3124 | } | |
3125 | ||
3126 | /* | |
3127 | * Connect a PPP channel to a PPP interface unit. | |
3128 | */ | |
3129 | static int | |
3130 | ppp_connect_channel(struct channel *pch, int unit) | |
3131 | { | |
3132 | struct ppp *ppp; | |
273ec51d | 3133 | struct ppp_net *pn; |
1da177e4 LT |
3134 | int ret = -ENXIO; |
3135 | int hdrlen; | |
3136 | ||
273ec51d CG |
3137 | pn = ppp_pernet(pch->chan_net); |
3138 | ||
3139 | mutex_lock(&pn->all_ppp_mutex); | |
3140 | ppp = ppp_find_unit(pn, unit); | |
cd228d54 | 3141 | if (!ppp) |
1da177e4 LT |
3142 | goto out; |
3143 | write_lock_bh(&pch->upl); | |
3144 | ret = -EINVAL; | |
cd228d54 | 3145 | if (pch->ppp) |
1da177e4 LT |
3146 | goto outl; |
3147 | ||
3148 | ppp_lock(ppp); | |
77f840e3 GN |
3149 | spin_lock_bh(&pch->downl); |
3150 | if (!pch->chan) { | |
3151 | /* Don't connect unregistered channels */ | |
3152 | spin_unlock_bh(&pch->downl); | |
3153 | ppp_unlock(ppp); | |
3154 | ret = -ENOTCONN; | |
3155 | goto outl; | |
3156 | } | |
3157 | spin_unlock_bh(&pch->downl); | |
1da177e4 LT |
3158 | if (pch->file.hdrlen > ppp->file.hdrlen) |
3159 | ppp->file.hdrlen = pch->file.hdrlen; | |
3160 | hdrlen = pch->file.hdrlen + 2; /* for protocol bytes */ | |
739840d5 | 3161 | if (hdrlen > ppp->dev->hard_header_len) |
1da177e4 LT |
3162 | ppp->dev->hard_header_len = hdrlen; |
3163 | list_add_tail(&pch->clist, &ppp->channels); | |
3164 | ++ppp->n_channels; | |
3165 | pch->ppp = ppp; | |
d780cd44 | 3166 | refcount_inc(&ppp->file.refcnt); |
1da177e4 LT |
3167 | ppp_unlock(ppp); |
3168 | ret = 0; | |
3169 | ||
3170 | outl: | |
3171 | write_unlock_bh(&pch->upl); | |
3172 | out: | |
273ec51d | 3173 | mutex_unlock(&pn->all_ppp_mutex); |
1da177e4 LT |
3174 | return ret; |
3175 | } | |
3176 | ||
3177 | /* | |
3178 | * Disconnect a channel from its ppp unit. | |
3179 | */ | |
3180 | static int | |
3181 | ppp_disconnect_channel(struct channel *pch) | |
3182 | { | |
3183 | struct ppp *ppp; | |
3184 | int err = -EINVAL; | |
3185 | ||
3186 | write_lock_bh(&pch->upl); | |
3187 | ppp = pch->ppp; | |
3188 | pch->ppp = NULL; | |
3189 | write_unlock_bh(&pch->upl); | |
cd228d54 | 3190 | if (ppp) { |
1da177e4 LT |
3191 | /* remove it from the ppp unit's list */ |
3192 | ppp_lock(ppp); | |
3193 | list_del(&pch->clist); | |
3194 | if (--ppp->n_channels == 0) | |
3195 | wake_up_interruptible(&ppp->file.rwait); | |
3196 | ppp_unlock(ppp); | |
d780cd44 | 3197 | if (refcount_dec_and_test(&ppp->file.refcnt)) |
1da177e4 LT |
3198 | ppp_destroy_interface(ppp); |
3199 | err = 0; | |
3200 | } | |
3201 | return err; | |
3202 | } | |
3203 | ||
3204 | /* | |
3205 | * Free up the resources used by a ppp channel. | |
3206 | */ | |
3207 | static void ppp_destroy_channel(struct channel *pch) | |
3208 | { | |
205e1e25 WC |
3209 | put_net(pch->chan_net); |
3210 | pch->chan_net = NULL; | |
3211 | ||
1da177e4 LT |
3212 | atomic_dec(&channel_count); |
3213 | ||
3214 | if (!pch->file.dead) { | |
3215 | /* "can't happen" */ | |
b48f8c23 | 3216 | pr_err("ppp: destroying undead channel %p !\n", pch); |
1da177e4 LT |
3217 | return; |
3218 | } | |
3219 | skb_queue_purge(&pch->file.xq); | |
3220 | skb_queue_purge(&pch->file.rq); | |
3221 | kfree(pch); | |
3222 | } | |
3223 | ||
3224 | static void __exit ppp_cleanup(void) | |
3225 | { | |
3226 | /* should never happen */ | |
3227 | if (atomic_read(&ppp_unit_count) || atomic_read(&channel_count)) | |
b48f8c23 | 3228 | pr_err("PPP: removing module but units remain!\n"); |
96d934c7 | 3229 | rtnl_link_unregister(&ppp_link_ops); |
68fc4fab | 3230 | unregister_chrdev(PPP_MAJOR, "ppp"); |
9a6a2a5e | 3231 | device_destroy(ppp_class, MKDEV(PPP_MAJOR, 0)); |
56b22935 | 3232 | class_destroy(ppp_class); |
741a6fa2 | 3233 | unregister_pernet_device(&ppp_net_ops); |
1da177e4 LT |
3234 | } |
3235 | ||
3236 | /* | |
7a95d267 CG |
3237 | * Units handling. Caller must protect concurrent access |
3238 | * by holding all_ppp_mutex | |
1da177e4 | 3239 | */ |
7a95d267 | 3240 | |
bcc70bb3 CG |
3241 | /* associate pointer with specified number */ |
3242 | static int unit_set(struct idr *p, void *ptr, int n) | |
3243 | { | |
3244 | int unit; | |
85997576 | 3245 | |
2fa532c5 TH |
3246 | unit = idr_alloc(p, ptr, n, n + 1, GFP_KERNEL); |
3247 | if (unit == -ENOSPC) | |
3248 | unit = -EINVAL; | |
85997576 CG |
3249 | return unit; |
3250 | } | |
3251 | ||
7a95d267 CG |
3252 | /* get new free unit number and associate pointer with it */ |
3253 | static int unit_get(struct idr *p, void *ptr) | |
1da177e4 | 3254 | { |
2fa532c5 | 3255 | return idr_alloc(p, ptr, 0, 0, GFP_KERNEL); |
1da177e4 LT |
3256 | } |
3257 | ||
7a95d267 CG |
3258 | /* put unit number back to a pool */ |
3259 | static void unit_put(struct idr *p, int n) | |
1da177e4 | 3260 | { |
7a95d267 | 3261 | idr_remove(p, n); |
1da177e4 LT |
3262 | } |
3263 | ||
7a95d267 CG |
3264 | /* get pointer associated with the number */ |
3265 | static void *unit_find(struct idr *p, int n) | |
1da177e4 | 3266 | { |
7a95d267 | 3267 | return idr_find(p, n); |
1da177e4 LT |
3268 | } |
3269 | ||
3270 | /* Module/initialization stuff */ | |
3271 | ||
3272 | module_init(ppp_init); | |
3273 | module_exit(ppp_cleanup); | |
3274 | ||
273ec51d | 3275 | EXPORT_SYMBOL(ppp_register_net_channel); |
1da177e4 LT |
3276 | EXPORT_SYMBOL(ppp_register_channel); |
3277 | EXPORT_SYMBOL(ppp_unregister_channel); | |
3278 | EXPORT_SYMBOL(ppp_channel_index); | |
3279 | EXPORT_SYMBOL(ppp_unit_number); | |
63f96072 | 3280 | EXPORT_SYMBOL(ppp_dev_name); |
1da177e4 LT |
3281 | EXPORT_SYMBOL(ppp_input); |
3282 | EXPORT_SYMBOL(ppp_input_error); | |
3283 | EXPORT_SYMBOL(ppp_output_wakeup); | |
3284 | EXPORT_SYMBOL(ppp_register_compressor); | |
3285 | EXPORT_SYMBOL(ppp_unregister_compressor); | |
3286 | MODULE_LICENSE("GPL"); | |
578454ff | 3287 | MODULE_ALIAS_CHARDEV(PPP_MAJOR, 0); |
96d934c7 | 3288 | MODULE_ALIAS_RTNL_LINK("ppp"); |
578454ff | 3289 | MODULE_ALIAS("devname:ppp"); |