2 * Generic PPP layer for Linux.
4 * Copyright 1999-2002 Paul Mackerras.
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.
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
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.
22 * ==FILEVERSION 20041108==
25 #include <linux/module.h>
26 #include <linux/kernel.h>
27 #include <linux/kmod.h>
28 #include <linux/init.h>
29 #include <linux/list.h>
30 #include <linux/idr.h>
31 #include <linux/netdevice.h>
32 #include <linux/poll.h>
33 #include <linux/ppp_defs.h>
34 #include <linux/filter.h>
35 #include <linux/ppp-ioctl.h>
36 #include <linux/ppp_channel.h>
37 #include <linux/ppp-comp.h>
38 #include <linux/skbuff.h>
39 #include <linux/rtnetlink.h>
40 #include <linux/if_arp.h>
42 #include <linux/tcp.h>
43 #include <linux/spinlock.h>
44 #include <linux/rwsem.h>
45 #include <linux/stddef.h>
46 #include <linux/device.h>
47 #include <linux/mutex.h>
48 #include <linux/slab.h>
49 #include <asm/unaligned.h>
50 #include <net/slhc_vj.h>
51 #include <linux/atomic.h>
53 #include <linux/nsproxy.h>
54 #include <net/net_namespace.h>
55 #include <net/netns/generic.h>
57 #define PPP_VERSION "2.4.2"
60 * Network protocols we support.
62 #define NP_IP 0 /* Internet Protocol V4 */
63 #define NP_IPV6 1 /* Internet Protocol V6 */
64 #define NP_IPX 2 /* IPX protocol */
65 #define NP_AT 3 /* Appletalk protocol */
66 #define NP_MPLS_UC 4 /* MPLS unicast */
67 #define NP_MPLS_MC 5 /* MPLS multicast */
68 #define NUM_NP 6 /* Number of NPs. */
70 #define MPHDRLEN 6 /* multilink protocol header length */
71 #define MPHDRLEN_SSN 4 /* ditto with short sequence numbers */
74 * An instance of /dev/ppp can be associated with either a ppp
75 * interface unit or a ppp channel. In both cases, file->private_data
76 * points to one of these.
82 struct sk_buff_head xq
; /* pppd transmit queue */
83 struct sk_buff_head rq
; /* receive queue for pppd */
84 wait_queue_head_t rwait
; /* for poll on reading /dev/ppp */
85 atomic_t refcnt
; /* # refs (incl /dev/ppp attached) */
86 int hdrlen
; /* space to leave for headers */
87 int index
; /* interface unit / channel number */
88 int dead
; /* unit/channel has been shut down */
91 #define PF_TO_X(pf, X) container_of(pf, X, file)
93 #define PF_TO_PPP(pf) PF_TO_X(pf, struct ppp)
94 #define PF_TO_CHANNEL(pf) PF_TO_X(pf, struct channel)
97 * Data structure to hold primary network stats for which
98 * we want to use 64 bit storage. Other network stats
99 * are stored in dev->stats of the ppp strucute.
101 struct ppp_link_stats
{
109 * Data structure describing one ppp unit.
110 * A ppp unit corresponds to a ppp network interface device
111 * and represents a multilink bundle.
112 * It can have 0 or more ppp channels connected to it.
115 struct ppp_file file
; /* stuff for read/write/poll 0 */
116 struct file
*owner
; /* file that owns this unit 48 */
117 struct list_head channels
; /* list of attached channels 4c */
118 int n_channels
; /* how many channels are attached 54 */
119 spinlock_t rlock
; /* lock for receive side 58 */
120 spinlock_t wlock
; /* lock for transmit side 5c */
121 int mru
; /* max receive unit 60 */
122 unsigned int flags
; /* control bits 64 */
123 unsigned int xstate
; /* transmit state bits 68 */
124 unsigned int rstate
; /* receive state bits 6c */
125 int debug
; /* debug flags 70 */
126 struct slcompress
*vj
; /* state for VJ header compression */
127 enum NPmode npmode
[NUM_NP
]; /* what to do with each net proto 78 */
128 struct sk_buff
*xmit_pending
; /* a packet ready to go out 88 */
129 struct compressor
*xcomp
; /* transmit packet compressor 8c */
130 void *xc_state
; /* its internal state 90 */
131 struct compressor
*rcomp
; /* receive decompressor 94 */
132 void *rc_state
; /* its internal state 98 */
133 unsigned long last_xmit
; /* jiffies when last pkt sent 9c */
134 unsigned long last_recv
; /* jiffies when last pkt rcvd a0 */
135 struct net_device
*dev
; /* network interface device a4 */
136 int closing
; /* is device closing down? a8 */
137 #ifdef CONFIG_PPP_MULTILINK
138 int nxchan
; /* next channel to send something on */
139 u32 nxseq
; /* next sequence number to send */
140 int mrru
; /* MP: max reconst. receive unit */
141 u32 nextseq
; /* MP: seq no of next packet */
142 u32 minseq
; /* MP: min of most recent seqnos */
143 struct sk_buff_head mrq
; /* MP: receive reconstruction queue */
144 #endif /* CONFIG_PPP_MULTILINK */
145 #ifdef CONFIG_PPP_FILTER
146 struct bpf_prog
*pass_filter
; /* filter for packets to pass */
147 struct bpf_prog
*active_filter
; /* filter for pkts to reset idle */
148 #endif /* CONFIG_PPP_FILTER */
149 struct net
*ppp_net
; /* the net we belong to */
150 struct ppp_link_stats stats64
; /* 64 bit network stats */
154 * Bits in flags: SC_NO_TCP_CCID, SC_CCP_OPEN, SC_CCP_UP, SC_LOOP_TRAFFIC,
155 * SC_MULTILINK, SC_MP_SHORTSEQ, SC_MP_XSHORTSEQ, SC_COMP_TCP, SC_REJ_COMP_TCP,
157 * Bits in rstate: SC_DECOMP_RUN, SC_DC_ERROR, SC_DC_FERROR.
158 * Bits in xstate: SC_COMP_RUN
160 #define SC_FLAG_BITS (SC_NO_TCP_CCID|SC_CCP_OPEN|SC_CCP_UP|SC_LOOP_TRAFFIC \
161 |SC_MULTILINK|SC_MP_SHORTSEQ|SC_MP_XSHORTSEQ \
162 |SC_COMP_TCP|SC_REJ_COMP_TCP|SC_MUST_COMP)
165 * Private data structure for each channel.
166 * This includes the data structure used for multilink.
169 struct ppp_file file
; /* stuff for read/write/poll */
170 struct list_head list
; /* link in all/new_channels list */
171 struct ppp_channel
*chan
; /* public channel data structure */
172 struct rw_semaphore chan_sem
; /* protects `chan' during chan ioctl */
173 spinlock_t downl
; /* protects `chan', file.xq dequeue */
174 struct ppp
*ppp
; /* ppp unit we're connected to */
175 struct net
*chan_net
; /* the net channel belongs to */
176 struct list_head clist
; /* link in list of channels per unit */
177 rwlock_t upl
; /* protects `ppp' */
178 #ifdef CONFIG_PPP_MULTILINK
179 u8 avail
; /* flag used in multilink stuff */
180 u8 had_frag
; /* >= 1 fragments have been sent */
181 u32 lastseq
; /* MP: last sequence # received */
182 int speed
; /* speed of the corresponding ppp channel*/
183 #endif /* CONFIG_PPP_MULTILINK */
187 * SMP locking issues:
188 * Both the ppp.rlock and ppp.wlock locks protect the ppp.channels
189 * list and the ppp.n_channels field, you need to take both locks
190 * before you modify them.
191 * The lock ordering is: channel.upl -> ppp.wlock -> ppp.rlock ->
195 static DEFINE_MUTEX(ppp_mutex
);
196 static atomic_t ppp_unit_count
= ATOMIC_INIT(0);
197 static atomic_t channel_count
= ATOMIC_INIT(0);
199 /* per-net private data for this module */
200 static int ppp_net_id __read_mostly
;
202 /* units to ppp mapping */
203 struct idr units_idr
;
206 * all_ppp_mutex protects the units_idr mapping.
207 * It also ensures that finding a ppp unit in the units_idr
208 * map and updating its file.refcnt field is atomic.
210 struct mutex all_ppp_mutex
;
213 struct list_head all_channels
;
214 struct list_head new_channels
;
215 int last_channel_index
;
218 * all_channels_lock protects all_channels and
219 * last_channel_index, and the atomicity of find
220 * a channel and updating its file.refcnt field.
222 spinlock_t all_channels_lock
;
225 /* Get the PPP protocol number from a skb */
226 #define PPP_PROTO(skb) get_unaligned_be16((skb)->data)
228 /* We limit the length of ppp->file.rq to this (arbitrary) value */
229 #define PPP_MAX_RQLEN 32
232 * Maximum number of multilink fragments queued up.
233 * This has to be large enough to cope with the maximum latency of
234 * the slowest channel relative to the others. Strictly it should
235 * depend on the number of channels and their characteristics.
237 #define PPP_MP_MAX_QLEN 128
239 /* Multilink header bits. */
240 #define B 0x80 /* this fragment begins a packet */
241 #define E 0x40 /* this fragment ends a packet */
243 /* Compare multilink sequence numbers (assumed to be 32 bits wide) */
244 #define seq_before(a, b) ((s32)((a) - (b)) < 0)
245 #define seq_after(a, b) ((s32)((a) - (b)) > 0)
248 static int ppp_unattached_ioctl(struct net
*net
, struct ppp_file
*pf
,
249 struct file
*file
, unsigned int cmd
, unsigned long arg
);
250 static void ppp_xmit_process(struct ppp
*ppp
);
251 static void ppp_send_frame(struct ppp
*ppp
, struct sk_buff
*skb
);
252 static void ppp_push(struct ppp
*ppp
);
253 static void ppp_channel_push(struct channel
*pch
);
254 static void ppp_receive_frame(struct ppp
*ppp
, struct sk_buff
*skb
,
255 struct channel
*pch
);
256 static void ppp_receive_error(struct ppp
*ppp
);
257 static void ppp_receive_nonmp_frame(struct ppp
*ppp
, struct sk_buff
*skb
);
258 static struct sk_buff
*ppp_decompress_frame(struct ppp
*ppp
,
259 struct sk_buff
*skb
);
260 #ifdef CONFIG_PPP_MULTILINK
261 static void ppp_receive_mp_frame(struct ppp
*ppp
, struct sk_buff
*skb
,
262 struct channel
*pch
);
263 static void ppp_mp_insert(struct ppp
*ppp
, struct sk_buff
*skb
);
264 static struct sk_buff
*ppp_mp_reconstruct(struct ppp
*ppp
);
265 static int ppp_mp_explode(struct ppp
*ppp
, struct sk_buff
*skb
);
266 #endif /* CONFIG_PPP_MULTILINK */
267 static int ppp_set_compress(struct ppp
*ppp
, unsigned long arg
);
268 static void ppp_ccp_peek(struct ppp
*ppp
, struct sk_buff
*skb
, int inbound
);
269 static void ppp_ccp_closed(struct ppp
*ppp
);
270 static struct compressor
*find_compressor(int type
);
271 static void ppp_get_stats(struct ppp
*ppp
, struct ppp_stats
*st
);
272 static struct ppp
*ppp_create_interface(struct net
*net
, int unit
,
273 struct file
*file
, int *retp
);
274 static void init_ppp_file(struct ppp_file
*pf
, int kind
);
275 static void ppp_destroy_interface(struct ppp
*ppp
);
276 static struct ppp
*ppp_find_unit(struct ppp_net
*pn
, int unit
);
277 static struct channel
*ppp_find_channel(struct ppp_net
*pn
, int unit
);
278 static int ppp_connect_channel(struct channel
*pch
, int unit
);
279 static int ppp_disconnect_channel(struct channel
*pch
);
280 static void ppp_destroy_channel(struct channel
*pch
);
281 static int unit_get(struct idr
*p
, void *ptr
);
282 static int unit_set(struct idr
*p
, void *ptr
, int n
);
283 static void unit_put(struct idr
*p
, int n
);
284 static void *unit_find(struct idr
*p
, int n
);
286 static const struct net_device_ops ppp_netdev_ops
;
288 static struct class *ppp_class
;
290 /* per net-namespace data */
291 static inline struct ppp_net
*ppp_pernet(struct net
*net
)
295 return net_generic(net
, ppp_net_id
);
298 /* Translates a PPP protocol number to a NP index (NP == network protocol) */
299 static inline int proto_to_npindex(int proto
)
318 /* Translates an NP index into a PPP protocol number */
319 static const int npindex_to_proto
[NUM_NP
] = {
328 /* Translates an ethertype into an NP index */
329 static inline int ethertype_to_npindex(int ethertype
)
349 /* Translates an NP index into an ethertype */
350 static const int npindex_to_ethertype
[NUM_NP
] = {
362 #define ppp_xmit_lock(ppp) spin_lock_bh(&(ppp)->wlock)
363 #define ppp_xmit_unlock(ppp) spin_unlock_bh(&(ppp)->wlock)
364 #define ppp_recv_lock(ppp) spin_lock_bh(&(ppp)->rlock)
365 #define ppp_recv_unlock(ppp) spin_unlock_bh(&(ppp)->rlock)
366 #define ppp_lock(ppp) do { ppp_xmit_lock(ppp); \
367 ppp_recv_lock(ppp); } while (0)
368 #define ppp_unlock(ppp) do { ppp_recv_unlock(ppp); \
369 ppp_xmit_unlock(ppp); } while (0)
372 * /dev/ppp device routines.
373 * The /dev/ppp device is used by pppd to control the ppp unit.
374 * It supports the read, write, ioctl and poll functions.
375 * Open instances of /dev/ppp can be in one of three states:
376 * unattached, attached to a ppp unit, or attached to a ppp channel.
378 static int ppp_open(struct inode
*inode
, struct file
*file
)
381 * This could (should?) be enforced by the permissions on /dev/ppp.
383 if (!capable(CAP_NET_ADMIN
))
388 static int ppp_release(struct inode
*unused
, struct file
*file
)
390 struct ppp_file
*pf
= file
->private_data
;
394 file
->private_data
= NULL
;
395 if (pf
->kind
== INTERFACE
) {
398 if (file
== ppp
->owner
)
399 unregister_netdevice(ppp
->dev
);
402 if (atomic_dec_and_test(&pf
->refcnt
)) {
405 ppp_destroy_interface(PF_TO_PPP(pf
));
408 ppp_destroy_channel(PF_TO_CHANNEL(pf
));
416 static ssize_t
ppp_read(struct file
*file
, char __user
*buf
,
417 size_t count
, loff_t
*ppos
)
419 struct ppp_file
*pf
= file
->private_data
;
420 DECLARE_WAITQUEUE(wait
, current
);
422 struct sk_buff
*skb
= NULL
;
430 add_wait_queue(&pf
->rwait
, &wait
);
432 set_current_state(TASK_INTERRUPTIBLE
);
433 skb
= skb_dequeue(&pf
->rq
);
439 if (pf
->kind
== INTERFACE
) {
441 * Return 0 (EOF) on an interface that has no
442 * channels connected, unless it is looping
443 * network traffic (demand mode).
445 struct ppp
*ppp
= PF_TO_PPP(pf
);
446 if (ppp
->n_channels
== 0 &&
447 (ppp
->flags
& SC_LOOP_TRAFFIC
) == 0)
451 if (file
->f_flags
& O_NONBLOCK
)
454 if (signal_pending(current
))
458 set_current_state(TASK_RUNNING
);
459 remove_wait_queue(&pf
->rwait
, &wait
);
465 if (skb
->len
> count
)
470 iov_iter_init(&to
, READ
, &iov
, 1, count
);
471 if (skb_copy_datagram_iter(skb
, 0, &to
, skb
->len
))
481 static ssize_t
ppp_write(struct file
*file
, const char __user
*buf
,
482 size_t count
, loff_t
*ppos
)
484 struct ppp_file
*pf
= file
->private_data
;
491 skb
= alloc_skb(count
+ pf
->hdrlen
, GFP_KERNEL
);
494 skb_reserve(skb
, pf
->hdrlen
);
496 if (copy_from_user(skb_put(skb
, count
), buf
, count
)) {
501 skb_queue_tail(&pf
->xq
, skb
);
505 ppp_xmit_process(PF_TO_PPP(pf
));
508 ppp_channel_push(PF_TO_CHANNEL(pf
));
518 /* No kernel lock - fine */
519 static unsigned int ppp_poll(struct file
*file
, poll_table
*wait
)
521 struct ppp_file
*pf
= file
->private_data
;
526 poll_wait(file
, &pf
->rwait
, wait
);
527 mask
= POLLOUT
| POLLWRNORM
;
528 if (skb_peek(&pf
->rq
))
529 mask
|= POLLIN
| POLLRDNORM
;
532 else if (pf
->kind
== INTERFACE
) {
533 /* see comment in ppp_read */
534 struct ppp
*ppp
= PF_TO_PPP(pf
);
535 if (ppp
->n_channels
== 0 &&
536 (ppp
->flags
& SC_LOOP_TRAFFIC
) == 0)
537 mask
|= POLLIN
| POLLRDNORM
;
543 #ifdef CONFIG_PPP_FILTER
544 static int get_filter(void __user
*arg
, struct sock_filter
**p
)
546 struct sock_fprog uprog
;
547 struct sock_filter
*code
= NULL
;
550 if (copy_from_user(&uprog
, arg
, sizeof(uprog
)))
558 len
= uprog
.len
* sizeof(struct sock_filter
);
559 code
= memdup_user(uprog
.filter
, len
);
561 return PTR_ERR(code
);
566 #endif /* CONFIG_PPP_FILTER */
568 static long ppp_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
570 struct ppp_file
*pf
= file
->private_data
;
572 int err
= -EFAULT
, val
, val2
, i
;
573 struct ppp_idle idle
;
576 struct slcompress
*vj
;
577 void __user
*argp
= (void __user
*)arg
;
578 int __user
*p
= argp
;
581 return ppp_unattached_ioctl(current
->nsproxy
->net_ns
,
584 if (cmd
== PPPIOCDETACH
) {
586 * We have to be careful here... if the file descriptor
587 * has been dup'd, we could have another process in the
588 * middle of a poll using the same file *, so we had
589 * better not free the interface data structures -
590 * instead we fail the ioctl. Even in this case, we
591 * shut down the interface if we are the owner of it.
592 * Actually, we should get rid of PPPIOCDETACH, userland
593 * (i.e. pppd) could achieve the same effect by closing
594 * this fd and reopening /dev/ppp.
597 mutex_lock(&ppp_mutex
);
598 if (pf
->kind
== INTERFACE
) {
601 if (file
== ppp
->owner
)
602 unregister_netdevice(ppp
->dev
);
605 if (atomic_long_read(&file
->f_count
) < 2) {
606 ppp_release(NULL
, file
);
609 pr_warn("PPPIOCDETACH file->f_count=%ld\n",
610 atomic_long_read(&file
->f_count
));
611 mutex_unlock(&ppp_mutex
);
615 if (pf
->kind
== CHANNEL
) {
617 struct ppp_channel
*chan
;
619 mutex_lock(&ppp_mutex
);
620 pch
= PF_TO_CHANNEL(pf
);
624 if (get_user(unit
, p
))
626 err
= ppp_connect_channel(pch
, unit
);
630 err
= ppp_disconnect_channel(pch
);
634 down_read(&pch
->chan_sem
);
637 if (chan
&& chan
->ops
->ioctl
)
638 err
= chan
->ops
->ioctl(chan
, cmd
, arg
);
639 up_read(&pch
->chan_sem
);
641 mutex_unlock(&ppp_mutex
);
645 if (pf
->kind
!= INTERFACE
) {
647 pr_err("PPP: not interface or channel??\n");
651 mutex_lock(&ppp_mutex
);
655 if (get_user(val
, p
))
662 if (get_user(val
, p
))
665 cflags
= ppp
->flags
& ~val
;
666 #ifdef CONFIG_PPP_MULTILINK
667 if (!(ppp
->flags
& SC_MULTILINK
) && (val
& SC_MULTILINK
))
670 ppp
->flags
= val
& SC_FLAG_BITS
;
672 if (cflags
& SC_CCP_OPEN
)
678 val
= ppp
->flags
| ppp
->xstate
| ppp
->rstate
;
679 if (put_user(val
, p
))
684 case PPPIOCSCOMPRESS
:
685 err
= ppp_set_compress(ppp
, arg
);
689 if (put_user(ppp
->file
.index
, p
))
695 if (get_user(val
, p
))
702 if (put_user(ppp
->debug
, p
))
708 idle
.xmit_idle
= (jiffies
- ppp
->last_xmit
) / HZ
;
709 idle
.recv_idle
= (jiffies
- ppp
->last_recv
) / HZ
;
710 if (copy_to_user(argp
, &idle
, sizeof(idle
)))
716 if (get_user(val
, p
))
719 if ((val
>> 16) != 0) {
723 vj
= slhc_init(val2
+1, val
+1);
726 "PPP: no memory (VJ compressor)\n");
740 if (copy_from_user(&npi
, argp
, sizeof(npi
)))
742 err
= proto_to_npindex(npi
.protocol
);
746 if (cmd
== PPPIOCGNPMODE
) {
748 npi
.mode
= ppp
->npmode
[i
];
749 if (copy_to_user(argp
, &npi
, sizeof(npi
)))
752 ppp
->npmode
[i
] = npi
.mode
;
753 /* we may be able to transmit more packets now (??) */
754 netif_wake_queue(ppp
->dev
);
759 #ifdef CONFIG_PPP_FILTER
762 struct sock_filter
*code
;
764 err
= get_filter(argp
, &code
);
766 struct bpf_prog
*pass_filter
= NULL
;
767 struct sock_fprog_kern fprog
= {
774 err
= bpf_prog_create(&pass_filter
, &fprog
);
777 if (ppp
->pass_filter
)
778 bpf_prog_destroy(ppp
->pass_filter
);
779 ppp
->pass_filter
= pass_filter
;
788 struct sock_filter
*code
;
790 err
= get_filter(argp
, &code
);
792 struct bpf_prog
*active_filter
= NULL
;
793 struct sock_fprog_kern fprog
= {
800 err
= bpf_prog_create(&active_filter
, &fprog
);
803 if (ppp
->active_filter
)
804 bpf_prog_destroy(ppp
->active_filter
);
805 ppp
->active_filter
= active_filter
;
812 #endif /* CONFIG_PPP_FILTER */
814 #ifdef CONFIG_PPP_MULTILINK
816 if (get_user(val
, p
))
820 ppp_recv_unlock(ppp
);
823 #endif /* CONFIG_PPP_MULTILINK */
828 mutex_unlock(&ppp_mutex
);
832 static int ppp_unattached_ioctl(struct net
*net
, struct ppp_file
*pf
,
833 struct file
*file
, unsigned int cmd
, unsigned long arg
)
835 int unit
, err
= -EFAULT
;
837 struct channel
*chan
;
839 int __user
*p
= (int __user
*)arg
;
841 mutex_lock(&ppp_mutex
);
844 /* Create a new ppp unit */
845 if (get_user(unit
, p
))
847 ppp
= ppp_create_interface(net
, unit
, file
, &err
);
850 file
->private_data
= &ppp
->file
;
852 if (put_user(ppp
->file
.index
, p
))
858 /* Attach to an existing ppp unit */
859 if (get_user(unit
, p
))
862 pn
= ppp_pernet(net
);
863 mutex_lock(&pn
->all_ppp_mutex
);
864 ppp
= ppp_find_unit(pn
, unit
);
866 atomic_inc(&ppp
->file
.refcnt
);
867 file
->private_data
= &ppp
->file
;
870 mutex_unlock(&pn
->all_ppp_mutex
);
874 if (get_user(unit
, p
))
877 pn
= ppp_pernet(net
);
878 spin_lock_bh(&pn
->all_channels_lock
);
879 chan
= ppp_find_channel(pn
, unit
);
881 atomic_inc(&chan
->file
.refcnt
);
882 file
->private_data
= &chan
->file
;
885 spin_unlock_bh(&pn
->all_channels_lock
);
891 mutex_unlock(&ppp_mutex
);
895 static const struct file_operations ppp_device_fops
= {
896 .owner
= THIS_MODULE
,
900 .unlocked_ioctl
= ppp_ioctl
,
902 .release
= ppp_release
,
903 .llseek
= noop_llseek
,
906 static __net_init
int ppp_init_net(struct net
*net
)
908 struct ppp_net
*pn
= net_generic(net
, ppp_net_id
);
910 idr_init(&pn
->units_idr
);
911 mutex_init(&pn
->all_ppp_mutex
);
913 INIT_LIST_HEAD(&pn
->all_channels
);
914 INIT_LIST_HEAD(&pn
->new_channels
);
916 spin_lock_init(&pn
->all_channels_lock
);
921 static __net_exit
void ppp_exit_net(struct net
*net
)
923 struct ppp_net
*pn
= net_generic(net
, ppp_net_id
);
924 struct net_device
*dev
;
925 struct net_device
*aux
;
931 for_each_netdev_safe(net
, dev
, aux
) {
932 if (dev
->netdev_ops
== &ppp_netdev_ops
)
933 unregister_netdevice_queue(dev
, &list
);
936 idr_for_each_entry(&pn
->units_idr
, ppp
, id
)
937 /* Skip devices already unregistered by previous loop */
938 if (!net_eq(dev_net(ppp
->dev
), net
))
939 unregister_netdevice_queue(ppp
->dev
, &list
);
941 unregister_netdevice_many(&list
);
944 idr_destroy(&pn
->units_idr
);
947 static struct pernet_operations ppp_net_ops
= {
948 .init
= ppp_init_net
,
949 .exit
= ppp_exit_net
,
951 .size
= sizeof(struct ppp_net
),
954 #define PPP_MAJOR 108
956 /* Called at boot time if ppp is compiled into the kernel,
957 or at module load time (from init_module) if compiled as a module. */
958 static int __init
ppp_init(void)
962 pr_info("PPP generic driver version " PPP_VERSION
"\n");
964 err
= register_pernet_device(&ppp_net_ops
);
966 pr_err("failed to register PPP pernet device (%d)\n", err
);
970 err
= register_chrdev(PPP_MAJOR
, "ppp", &ppp_device_fops
);
972 pr_err("failed to register PPP device (%d)\n", err
);
976 ppp_class
= class_create(THIS_MODULE
, "ppp");
977 if (IS_ERR(ppp_class
)) {
978 err
= PTR_ERR(ppp_class
);
982 /* not a big deal if we fail here :-) */
983 device_create(ppp_class
, NULL
, MKDEV(PPP_MAJOR
, 0), NULL
, "ppp");
988 unregister_chrdev(PPP_MAJOR
, "ppp");
990 unregister_pernet_device(&ppp_net_ops
);
996 * Network interface unit routines.
999 ppp_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1001 struct ppp
*ppp
= netdev_priv(dev
);
1005 npi
= ethertype_to_npindex(ntohs(skb
->protocol
));
1009 /* Drop, accept or reject the packet */
1010 switch (ppp
->npmode
[npi
]) {
1014 /* it would be nice to have a way to tell the network
1015 system to queue this one up for later. */
1022 /* Put the 2-byte PPP protocol number on the front,
1023 making sure there is room for the address and control fields. */
1024 if (skb_cow_head(skb
, PPP_HDRLEN
))
1027 pp
= skb_push(skb
, 2);
1028 proto
= npindex_to_proto
[npi
];
1029 put_unaligned_be16(proto
, pp
);
1031 skb_scrub_packet(skb
, !net_eq(ppp
->ppp_net
, dev_net(dev
)));
1032 skb_queue_tail(&ppp
->file
.xq
, skb
);
1033 ppp_xmit_process(ppp
);
1034 return NETDEV_TX_OK
;
1038 ++dev
->stats
.tx_dropped
;
1039 return NETDEV_TX_OK
;
1043 ppp_net_ioctl(struct net_device
*dev
, struct ifreq
*ifr
, int cmd
)
1045 struct ppp
*ppp
= netdev_priv(dev
);
1047 void __user
*addr
= (void __user
*) ifr
->ifr_ifru
.ifru_data
;
1048 struct ppp_stats stats
;
1049 struct ppp_comp_stats cstats
;
1054 ppp_get_stats(ppp
, &stats
);
1055 if (copy_to_user(addr
, &stats
, sizeof(stats
)))
1060 case SIOCGPPPCSTATS
:
1061 memset(&cstats
, 0, sizeof(cstats
));
1063 ppp
->xcomp
->comp_stat(ppp
->xc_state
, &cstats
.c
);
1065 ppp
->rcomp
->decomp_stat(ppp
->rc_state
, &cstats
.d
);
1066 if (copy_to_user(addr
, &cstats
, sizeof(cstats
)))
1073 if (copy_to_user(addr
, vers
, strlen(vers
) + 1))
1085 static struct rtnl_link_stats64
*
1086 ppp_get_stats64(struct net_device
*dev
, struct rtnl_link_stats64
*stats64
)
1088 struct ppp
*ppp
= netdev_priv(dev
);
1091 stats64
->rx_packets
= ppp
->stats64
.rx_packets
;
1092 stats64
->rx_bytes
= ppp
->stats64
.rx_bytes
;
1093 ppp_recv_unlock(ppp
);
1096 stats64
->tx_packets
= ppp
->stats64
.tx_packets
;
1097 stats64
->tx_bytes
= ppp
->stats64
.tx_bytes
;
1098 ppp_xmit_unlock(ppp
);
1100 stats64
->rx_errors
= dev
->stats
.rx_errors
;
1101 stats64
->tx_errors
= dev
->stats
.tx_errors
;
1102 stats64
->rx_dropped
= dev
->stats
.rx_dropped
;
1103 stats64
->tx_dropped
= dev
->stats
.tx_dropped
;
1104 stats64
->rx_length_errors
= dev
->stats
.rx_length_errors
;
1109 static struct lock_class_key ppp_tx_busylock
;
1110 static int ppp_dev_init(struct net_device
*dev
)
1112 dev
->qdisc_tx_busylock
= &ppp_tx_busylock
;
1116 static void ppp_dev_uninit(struct net_device
*dev
)
1118 struct ppp
*ppp
= netdev_priv(dev
);
1119 struct ppp_net
*pn
= ppp_pernet(ppp
->ppp_net
);
1125 mutex_lock(&pn
->all_ppp_mutex
);
1126 unit_put(&pn
->units_idr
, ppp
->file
.index
);
1127 mutex_unlock(&pn
->all_ppp_mutex
);
1132 wake_up_interruptible(&ppp
->file
.rwait
);
1135 static const struct net_device_ops ppp_netdev_ops
= {
1136 .ndo_init
= ppp_dev_init
,
1137 .ndo_uninit
= ppp_dev_uninit
,
1138 .ndo_start_xmit
= ppp_start_xmit
,
1139 .ndo_do_ioctl
= ppp_net_ioctl
,
1140 .ndo_get_stats64
= ppp_get_stats64
,
1143 static void ppp_setup(struct net_device
*dev
)
1145 dev
->netdev_ops
= &ppp_netdev_ops
;
1146 dev
->hard_header_len
= PPP_HDRLEN
;
1149 dev
->tx_queue_len
= 3;
1150 dev
->type
= ARPHRD_PPP
;
1151 dev
->flags
= IFF_POINTOPOINT
| IFF_NOARP
| IFF_MULTICAST
;
1152 netif_keep_dst(dev
);
1156 * Transmit-side routines.
1160 * Called to do any work queued up on the transmit side
1161 * that can now be done.
1164 ppp_xmit_process(struct ppp
*ppp
)
1166 struct sk_buff
*skb
;
1169 if (!ppp
->closing
) {
1171 while (!ppp
->xmit_pending
&&
1172 (skb
= skb_dequeue(&ppp
->file
.xq
)))
1173 ppp_send_frame(ppp
, skb
);
1174 /* If there's no work left to do, tell the core net
1175 code that we can accept some more. */
1176 if (!ppp
->xmit_pending
&& !skb_peek(&ppp
->file
.xq
))
1177 netif_wake_queue(ppp
->dev
);
1179 netif_stop_queue(ppp
->dev
);
1181 ppp_xmit_unlock(ppp
);
1184 static inline struct sk_buff
*
1185 pad_compress_skb(struct ppp
*ppp
, struct sk_buff
*skb
)
1187 struct sk_buff
*new_skb
;
1189 int new_skb_size
= ppp
->dev
->mtu
+
1190 ppp
->xcomp
->comp_extra
+ ppp
->dev
->hard_header_len
;
1191 int compressor_skb_size
= ppp
->dev
->mtu
+
1192 ppp
->xcomp
->comp_extra
+ PPP_HDRLEN
;
1193 new_skb
= alloc_skb(new_skb_size
, GFP_ATOMIC
);
1195 if (net_ratelimit())
1196 netdev_err(ppp
->dev
, "PPP: no memory (comp pkt)\n");
1199 if (ppp
->dev
->hard_header_len
> PPP_HDRLEN
)
1200 skb_reserve(new_skb
,
1201 ppp
->dev
->hard_header_len
- PPP_HDRLEN
);
1203 /* compressor still expects A/C bytes in hdr */
1204 len
= ppp
->xcomp
->compress(ppp
->xc_state
, skb
->data
- 2,
1205 new_skb
->data
, skb
->len
+ 2,
1206 compressor_skb_size
);
1207 if (len
> 0 && (ppp
->flags
& SC_CCP_UP
)) {
1211 skb_pull(skb
, 2); /* pull off A/C bytes */
1212 } else if (len
== 0) {
1213 /* didn't compress, or CCP not up yet */
1214 consume_skb(new_skb
);
1219 * MPPE requires that we do not send unencrypted
1220 * frames. The compressor will return -1 if we
1221 * should drop the frame. We cannot simply test
1222 * the compress_proto because MPPE and MPPC share
1225 if (net_ratelimit())
1226 netdev_err(ppp
->dev
, "ppp: compressor dropped pkt\n");
1228 consume_skb(new_skb
);
1235 * Compress and send a frame.
1236 * The caller should have locked the xmit path,
1237 * and xmit_pending should be 0.
1240 ppp_send_frame(struct ppp
*ppp
, struct sk_buff
*skb
)
1242 int proto
= PPP_PROTO(skb
);
1243 struct sk_buff
*new_skb
;
1247 if (proto
< 0x8000) {
1248 #ifdef CONFIG_PPP_FILTER
1249 /* check if we should pass this packet */
1250 /* the filter instructions are constructed assuming
1251 a four-byte PPP header on each packet */
1252 *skb_push(skb
, 2) = 1;
1253 if (ppp
->pass_filter
&&
1254 BPF_PROG_RUN(ppp
->pass_filter
, skb
) == 0) {
1256 netdev_printk(KERN_DEBUG
, ppp
->dev
,
1257 "PPP: outbound frame "
1262 /* if this packet passes the active filter, record the time */
1263 if (!(ppp
->active_filter
&&
1264 BPF_PROG_RUN(ppp
->active_filter
, skb
) == 0))
1265 ppp
->last_xmit
= jiffies
;
1268 /* for data packets, record the time */
1269 ppp
->last_xmit
= jiffies
;
1270 #endif /* CONFIG_PPP_FILTER */
1273 ++ppp
->stats64
.tx_packets
;
1274 ppp
->stats64
.tx_bytes
+= skb
->len
- 2;
1278 if (!ppp
->vj
|| (ppp
->flags
& SC_COMP_TCP
) == 0)
1280 /* try to do VJ TCP header compression */
1281 new_skb
= alloc_skb(skb
->len
+ ppp
->dev
->hard_header_len
- 2,
1284 netdev_err(ppp
->dev
, "PPP: no memory (VJ comp pkt)\n");
1287 skb_reserve(new_skb
, ppp
->dev
->hard_header_len
- 2);
1289 len
= slhc_compress(ppp
->vj
, cp
, skb
->len
- 2,
1290 new_skb
->data
+ 2, &cp
,
1291 !(ppp
->flags
& SC_NO_TCP_CCID
));
1292 if (cp
== skb
->data
+ 2) {
1293 /* didn't compress */
1294 consume_skb(new_skb
);
1296 if (cp
[0] & SL_TYPE_COMPRESSED_TCP
) {
1297 proto
= PPP_VJC_COMP
;
1298 cp
[0] &= ~SL_TYPE_COMPRESSED_TCP
;
1300 proto
= PPP_VJC_UNCOMP
;
1301 cp
[0] = skb
->data
[2];
1305 cp
= skb_put(skb
, len
+ 2);
1312 /* peek at outbound CCP frames */
1313 ppp_ccp_peek(ppp
, skb
, 0);
1317 /* try to do packet compression */
1318 if ((ppp
->xstate
& SC_COMP_RUN
) && ppp
->xc_state
&&
1319 proto
!= PPP_LCP
&& proto
!= PPP_CCP
) {
1320 if (!(ppp
->flags
& SC_CCP_UP
) && (ppp
->flags
& SC_MUST_COMP
)) {
1321 if (net_ratelimit())
1322 netdev_err(ppp
->dev
,
1323 "ppp: compression required but "
1324 "down - pkt dropped.\n");
1327 skb
= pad_compress_skb(ppp
, skb
);
1333 * If we are waiting for traffic (demand dialling),
1334 * queue it up for pppd to receive.
1336 if (ppp
->flags
& SC_LOOP_TRAFFIC
) {
1337 if (ppp
->file
.rq
.qlen
> PPP_MAX_RQLEN
)
1339 skb_queue_tail(&ppp
->file
.rq
, skb
);
1340 wake_up_interruptible(&ppp
->file
.rwait
);
1344 ppp
->xmit_pending
= skb
;
1350 ++ppp
->dev
->stats
.tx_errors
;
1354 * Try to send the frame in xmit_pending.
1355 * The caller should have the xmit path locked.
1358 ppp_push(struct ppp
*ppp
)
1360 struct list_head
*list
;
1361 struct channel
*pch
;
1362 struct sk_buff
*skb
= ppp
->xmit_pending
;
1367 list
= &ppp
->channels
;
1368 if (list_empty(list
)) {
1369 /* nowhere to send the packet, just drop it */
1370 ppp
->xmit_pending
= NULL
;
1375 if ((ppp
->flags
& SC_MULTILINK
) == 0) {
1376 /* not doing multilink: send it down the first channel */
1378 pch
= list_entry(list
, struct channel
, clist
);
1380 spin_lock_bh(&pch
->downl
);
1382 if (pch
->chan
->ops
->start_xmit(pch
->chan
, skb
))
1383 ppp
->xmit_pending
= NULL
;
1385 /* channel got unregistered */
1387 ppp
->xmit_pending
= NULL
;
1389 spin_unlock_bh(&pch
->downl
);
1393 #ifdef CONFIG_PPP_MULTILINK
1394 /* Multilink: fragment the packet over as many links
1395 as can take the packet at the moment. */
1396 if (!ppp_mp_explode(ppp
, skb
))
1398 #endif /* CONFIG_PPP_MULTILINK */
1400 ppp
->xmit_pending
= NULL
;
1404 #ifdef CONFIG_PPP_MULTILINK
1405 static bool mp_protocol_compress __read_mostly
= true;
1406 module_param(mp_protocol_compress
, bool, S_IRUGO
| S_IWUSR
);
1407 MODULE_PARM_DESC(mp_protocol_compress
,
1408 "compress protocol id in multilink fragments");
1411 * Divide a packet to be transmitted into fragments and
1412 * send them out the individual links.
1414 static int ppp_mp_explode(struct ppp
*ppp
, struct sk_buff
*skb
)
1417 int i
, bits
, hdrlen
, mtu
;
1419 int navail
, nfree
, nzero
;
1423 unsigned char *p
, *q
;
1424 struct list_head
*list
;
1425 struct channel
*pch
;
1426 struct sk_buff
*frag
;
1427 struct ppp_channel
*chan
;
1429 totspeed
= 0; /*total bitrate of the bundle*/
1430 nfree
= 0; /* # channels which have no packet already queued */
1431 navail
= 0; /* total # of usable channels (not deregistered) */
1432 nzero
= 0; /* number of channels with zero speed associated*/
1433 totfree
= 0; /*total # of channels available and
1434 *having no queued packets before
1435 *starting the fragmentation*/
1437 hdrlen
= (ppp
->flags
& SC_MP_XSHORTSEQ
)? MPHDRLEN_SSN
: MPHDRLEN
;
1439 list_for_each_entry(pch
, &ppp
->channels
, clist
) {
1443 pch
->speed
= pch
->chan
->speed
;
1448 if (skb_queue_empty(&pch
->file
.xq
) ||
1450 if (pch
->speed
== 0)
1453 totspeed
+= pch
->speed
;
1459 if (!pch
->had_frag
&& i
< ppp
->nxchan
)
1465 * Don't start sending this packet unless at least half of
1466 * the channels are free. This gives much better TCP
1467 * performance if we have a lot of channels.
1469 if (nfree
== 0 || nfree
< navail
/ 2)
1470 return 0; /* can't take now, leave it in xmit_pending */
1472 /* Do protocol field compression */
1475 if (*p
== 0 && mp_protocol_compress
) {
1481 nbigger
= len
% nfree
;
1483 /* skip to the channel after the one we last used
1484 and start at that one */
1485 list
= &ppp
->channels
;
1486 for (i
= 0; i
< ppp
->nxchan
; ++i
) {
1488 if (list
== &ppp
->channels
) {
1494 /* create a fragment for each channel */
1498 if (list
== &ppp
->channels
) {
1502 pch
= list_entry(list
, struct channel
, clist
);
1508 * Skip this channel if it has a fragment pending already and
1509 * we haven't given a fragment to all of the free channels.
1511 if (pch
->avail
== 1) {
1518 /* check the channel's mtu and whether it is still attached. */
1519 spin_lock_bh(&pch
->downl
);
1520 if (pch
->chan
== NULL
) {
1521 /* can't use this channel, it's being deregistered */
1522 if (pch
->speed
== 0)
1525 totspeed
-= pch
->speed
;
1527 spin_unlock_bh(&pch
->downl
);
1538 *if the channel speed is not set divide
1539 *the packet evenly among the free channels;
1540 *otherwise divide it according to the speed
1541 *of the channel we are going to transmit on
1545 if (pch
->speed
== 0) {
1552 flen
= (((totfree
- nzero
)*(totlen
+ hdrlen
*totfree
)) /
1553 ((totspeed
*totfree
)/pch
->speed
)) - hdrlen
;
1555 flen
+= ((totfree
- nzero
)*pch
->speed
)/totspeed
;
1556 nbigger
-= ((totfree
- nzero
)*pch
->speed
)/
1564 *check if we are on the last channel or
1565 *we exceded the length of the data to
1568 if ((nfree
<= 0) || (flen
> len
))
1571 *it is not worth to tx on slow channels:
1572 *in that case from the resulting flen according to the
1573 *above formula will be equal or less than zero.
1574 *Skip the channel in this case
1578 spin_unlock_bh(&pch
->downl
);
1583 * hdrlen includes the 2-byte PPP protocol field, but the
1584 * MTU counts only the payload excluding the protocol field.
1585 * (RFC1661 Section 2)
1587 mtu
= pch
->chan
->mtu
- (hdrlen
- 2);
1594 frag
= alloc_skb(flen
+ hdrlen
+ (flen
== 0), GFP_ATOMIC
);
1597 q
= skb_put(frag
, flen
+ hdrlen
);
1599 /* make the MP header */
1600 put_unaligned_be16(PPP_MP
, q
);
1601 if (ppp
->flags
& SC_MP_XSHORTSEQ
) {
1602 q
[2] = bits
+ ((ppp
->nxseq
>> 8) & 0xf);
1606 q
[3] = ppp
->nxseq
>> 16;
1607 q
[4] = ppp
->nxseq
>> 8;
1611 memcpy(q
+ hdrlen
, p
, flen
);
1613 /* try to send it down the channel */
1615 if (!skb_queue_empty(&pch
->file
.xq
) ||
1616 !chan
->ops
->start_xmit(chan
, frag
))
1617 skb_queue_tail(&pch
->file
.xq
, frag
);
1623 spin_unlock_bh(&pch
->downl
);
1630 spin_unlock_bh(&pch
->downl
);
1632 netdev_err(ppp
->dev
, "PPP: no memory (fragment)\n");
1633 ++ppp
->dev
->stats
.tx_errors
;
1635 return 1; /* abandon the frame */
1637 #endif /* CONFIG_PPP_MULTILINK */
1640 * Try to send data out on a channel.
1643 ppp_channel_push(struct channel
*pch
)
1645 struct sk_buff
*skb
;
1648 spin_lock_bh(&pch
->downl
);
1650 while (!skb_queue_empty(&pch
->file
.xq
)) {
1651 skb
= skb_dequeue(&pch
->file
.xq
);
1652 if (!pch
->chan
->ops
->start_xmit(pch
->chan
, skb
)) {
1653 /* put the packet back and try again later */
1654 skb_queue_head(&pch
->file
.xq
, skb
);
1659 /* channel got deregistered */
1660 skb_queue_purge(&pch
->file
.xq
);
1662 spin_unlock_bh(&pch
->downl
);
1663 /* see if there is anything from the attached unit to be sent */
1664 if (skb_queue_empty(&pch
->file
.xq
)) {
1665 read_lock_bh(&pch
->upl
);
1668 ppp_xmit_process(ppp
);
1669 read_unlock_bh(&pch
->upl
);
1674 * Receive-side routines.
1677 struct ppp_mp_skb_parm
{
1681 #define PPP_MP_CB(skb) ((struct ppp_mp_skb_parm *)((skb)->cb))
1684 ppp_do_recv(struct ppp
*ppp
, struct sk_buff
*skb
, struct channel
*pch
)
1688 ppp_receive_frame(ppp
, skb
, pch
);
1691 ppp_recv_unlock(ppp
);
1695 ppp_input(struct ppp_channel
*chan
, struct sk_buff
*skb
)
1697 struct channel
*pch
= chan
->ppp
;
1705 read_lock_bh(&pch
->upl
);
1706 if (!pskb_may_pull(skb
, 2)) {
1709 ++pch
->ppp
->dev
->stats
.rx_length_errors
;
1710 ppp_receive_error(pch
->ppp
);
1715 proto
= PPP_PROTO(skb
);
1716 if (!pch
->ppp
|| proto
>= 0xc000 || proto
== PPP_CCPFRAG
) {
1717 /* put it on the channel queue */
1718 skb_queue_tail(&pch
->file
.rq
, skb
);
1719 /* drop old frames if queue too long */
1720 while (pch
->file
.rq
.qlen
> PPP_MAX_RQLEN
&&
1721 (skb
= skb_dequeue(&pch
->file
.rq
)))
1723 wake_up_interruptible(&pch
->file
.rwait
);
1725 ppp_do_recv(pch
->ppp
, skb
, pch
);
1729 read_unlock_bh(&pch
->upl
);
1732 /* Put a 0-length skb in the receive queue as an error indication */
1734 ppp_input_error(struct ppp_channel
*chan
, int code
)
1736 struct channel
*pch
= chan
->ppp
;
1737 struct sk_buff
*skb
;
1742 read_lock_bh(&pch
->upl
);
1744 skb
= alloc_skb(0, GFP_ATOMIC
);
1746 skb
->len
= 0; /* probably unnecessary */
1748 ppp_do_recv(pch
->ppp
, skb
, pch
);
1751 read_unlock_bh(&pch
->upl
);
1755 * We come in here to process a received frame.
1756 * The receive side of the ppp unit is locked.
1759 ppp_receive_frame(struct ppp
*ppp
, struct sk_buff
*skb
, struct channel
*pch
)
1761 /* note: a 0-length skb is used as an error indication */
1763 skb_checksum_complete_unset(skb
);
1764 #ifdef CONFIG_PPP_MULTILINK
1765 /* XXX do channel-level decompression here */
1766 if (PPP_PROTO(skb
) == PPP_MP
)
1767 ppp_receive_mp_frame(ppp
, skb
, pch
);
1769 #endif /* CONFIG_PPP_MULTILINK */
1770 ppp_receive_nonmp_frame(ppp
, skb
);
1773 ppp_receive_error(ppp
);
1778 ppp_receive_error(struct ppp
*ppp
)
1780 ++ppp
->dev
->stats
.rx_errors
;
1786 ppp_receive_nonmp_frame(struct ppp
*ppp
, struct sk_buff
*skb
)
1789 int proto
, len
, npi
;
1792 * Decompress the frame, if compressed.
1793 * Note that some decompressors need to see uncompressed frames
1794 * that come in as well as compressed frames.
1796 if (ppp
->rc_state
&& (ppp
->rstate
& SC_DECOMP_RUN
) &&
1797 (ppp
->rstate
& (SC_DC_FERROR
| SC_DC_ERROR
)) == 0)
1798 skb
= ppp_decompress_frame(ppp
, skb
);
1800 if (ppp
->flags
& SC_MUST_COMP
&& ppp
->rstate
& SC_DC_FERROR
)
1803 proto
= PPP_PROTO(skb
);
1806 /* decompress VJ compressed packets */
1807 if (!ppp
->vj
|| (ppp
->flags
& SC_REJ_COMP_TCP
))
1810 if (skb_tailroom(skb
) < 124 || skb_cloned(skb
)) {
1811 /* copy to a new sk_buff with more tailroom */
1812 ns
= dev_alloc_skb(skb
->len
+ 128);
1814 netdev_err(ppp
->dev
, "PPP: no memory "
1819 skb_copy_bits(skb
, 0, skb_put(ns
, skb
->len
), skb
->len
);
1824 skb
->ip_summed
= CHECKSUM_NONE
;
1826 len
= slhc_uncompress(ppp
->vj
, skb
->data
+ 2, skb
->len
- 2);
1828 netdev_printk(KERN_DEBUG
, ppp
->dev
,
1829 "PPP: VJ decompression error\n");
1834 skb_put(skb
, len
- skb
->len
);
1835 else if (len
< skb
->len
)
1840 case PPP_VJC_UNCOMP
:
1841 if (!ppp
->vj
|| (ppp
->flags
& SC_REJ_COMP_TCP
))
1844 /* Until we fix the decompressor need to make sure
1845 * data portion is linear.
1847 if (!pskb_may_pull(skb
, skb
->len
))
1850 if (slhc_remember(ppp
->vj
, skb
->data
+ 2, skb
->len
- 2) <= 0) {
1851 netdev_err(ppp
->dev
, "PPP: VJ uncompressed error\n");
1858 ppp_ccp_peek(ppp
, skb
, 1);
1862 ++ppp
->stats64
.rx_packets
;
1863 ppp
->stats64
.rx_bytes
+= skb
->len
- 2;
1865 npi
= proto_to_npindex(proto
);
1867 /* control or unknown frame - pass it to pppd */
1868 skb_queue_tail(&ppp
->file
.rq
, skb
);
1869 /* limit queue length by dropping old frames */
1870 while (ppp
->file
.rq
.qlen
> PPP_MAX_RQLEN
&&
1871 (skb
= skb_dequeue(&ppp
->file
.rq
)))
1873 /* wake up any process polling or blocking on read */
1874 wake_up_interruptible(&ppp
->file
.rwait
);
1877 /* network protocol frame - give it to the kernel */
1879 #ifdef CONFIG_PPP_FILTER
1880 /* check if the packet passes the pass and active filters */
1881 /* the filter instructions are constructed assuming
1882 a four-byte PPP header on each packet */
1883 if (ppp
->pass_filter
|| ppp
->active_filter
) {
1884 if (skb_unclone(skb
, GFP_ATOMIC
))
1887 *skb_push(skb
, 2) = 0;
1888 if (ppp
->pass_filter
&&
1889 BPF_PROG_RUN(ppp
->pass_filter
, skb
) == 0) {
1891 netdev_printk(KERN_DEBUG
, ppp
->dev
,
1892 "PPP: inbound frame "
1897 if (!(ppp
->active_filter
&&
1898 BPF_PROG_RUN(ppp
->active_filter
, skb
) == 0))
1899 ppp
->last_recv
= jiffies
;
1902 #endif /* CONFIG_PPP_FILTER */
1903 ppp
->last_recv
= jiffies
;
1905 if ((ppp
->dev
->flags
& IFF_UP
) == 0 ||
1906 ppp
->npmode
[npi
] != NPMODE_PASS
) {
1909 /* chop off protocol */
1910 skb_pull_rcsum(skb
, 2);
1911 skb
->dev
= ppp
->dev
;
1912 skb
->protocol
= htons(npindex_to_ethertype
[npi
]);
1913 skb_reset_mac_header(skb
);
1914 skb_scrub_packet(skb
, !net_eq(ppp
->ppp_net
,
1915 dev_net(ppp
->dev
)));
1923 ppp_receive_error(ppp
);
1926 static struct sk_buff
*
1927 ppp_decompress_frame(struct ppp
*ppp
, struct sk_buff
*skb
)
1929 int proto
= PPP_PROTO(skb
);
1933 /* Until we fix all the decompressor's need to make sure
1934 * data portion is linear.
1936 if (!pskb_may_pull(skb
, skb
->len
))
1939 if (proto
== PPP_COMP
) {
1942 switch(ppp
->rcomp
->compress_proto
) {
1944 obuff_size
= ppp
->mru
+ PPP_HDRLEN
+ 1;
1947 obuff_size
= ppp
->mru
+ PPP_HDRLEN
;
1951 ns
= dev_alloc_skb(obuff_size
);
1953 netdev_err(ppp
->dev
, "ppp_decompress_frame: "
1957 /* the decompressor still expects the A/C bytes in the hdr */
1958 len
= ppp
->rcomp
->decompress(ppp
->rc_state
, skb
->data
- 2,
1959 skb
->len
+ 2, ns
->data
, obuff_size
);
1961 /* Pass the compressed frame to pppd as an
1962 error indication. */
1963 if (len
== DECOMP_FATALERROR
)
1964 ppp
->rstate
|= SC_DC_FERROR
;
1972 skb_pull(skb
, 2); /* pull off the A/C bytes */
1975 /* Uncompressed frame - pass to decompressor so it
1976 can update its dictionary if necessary. */
1977 if (ppp
->rcomp
->incomp
)
1978 ppp
->rcomp
->incomp(ppp
->rc_state
, skb
->data
- 2,
1985 ppp
->rstate
|= SC_DC_ERROR
;
1986 ppp_receive_error(ppp
);
1990 #ifdef CONFIG_PPP_MULTILINK
1992 * Receive a multilink frame.
1993 * We put it on the reconstruction queue and then pull off
1994 * as many completed frames as we can.
1997 ppp_receive_mp_frame(struct ppp
*ppp
, struct sk_buff
*skb
, struct channel
*pch
)
2001 int mphdrlen
= (ppp
->flags
& SC_MP_SHORTSEQ
)? MPHDRLEN_SSN
: MPHDRLEN
;
2003 if (!pskb_may_pull(skb
, mphdrlen
+ 1) || ppp
->mrru
== 0)
2004 goto err
; /* no good, throw it away */
2006 /* Decode sequence number and begin/end bits */
2007 if (ppp
->flags
& SC_MP_SHORTSEQ
) {
2008 seq
= ((skb
->data
[2] & 0x0f) << 8) | skb
->data
[3];
2011 seq
= (skb
->data
[3] << 16) | (skb
->data
[4] << 8)| skb
->data
[5];
2014 PPP_MP_CB(skb
)->BEbits
= skb
->data
[2];
2015 skb_pull(skb
, mphdrlen
); /* pull off PPP and MP headers */
2018 * Do protocol ID decompression on the first fragment of each packet.
2020 if ((PPP_MP_CB(skb
)->BEbits
& B
) && (skb
->data
[0] & 1))
2021 *skb_push(skb
, 1) = 0;
2024 * Expand sequence number to 32 bits, making it as close
2025 * as possible to ppp->minseq.
2027 seq
|= ppp
->minseq
& ~mask
;
2028 if ((int)(ppp
->minseq
- seq
) > (int)(mask
>> 1))
2030 else if ((int)(seq
- ppp
->minseq
) > (int)(mask
>> 1))
2031 seq
-= mask
+ 1; /* should never happen */
2032 PPP_MP_CB(skb
)->sequence
= seq
;
2036 * If this packet comes before the next one we were expecting,
2039 if (seq_before(seq
, ppp
->nextseq
)) {
2041 ++ppp
->dev
->stats
.rx_dropped
;
2042 ppp_receive_error(ppp
);
2047 * Reevaluate minseq, the minimum over all channels of the
2048 * last sequence number received on each channel. Because of
2049 * the increasing sequence number rule, we know that any fragment
2050 * before `minseq' which hasn't arrived is never going to arrive.
2051 * The list of channels can't change because we have the receive
2052 * side of the ppp unit locked.
2054 list_for_each_entry(ch
, &ppp
->channels
, clist
) {
2055 if (seq_before(ch
->lastseq
, seq
))
2058 if (seq_before(ppp
->minseq
, seq
))
2061 /* Put the fragment on the reconstruction queue */
2062 ppp_mp_insert(ppp
, skb
);
2064 /* If the queue is getting long, don't wait any longer for packets
2065 before the start of the queue. */
2066 if (skb_queue_len(&ppp
->mrq
) >= PPP_MP_MAX_QLEN
) {
2067 struct sk_buff
*mskb
= skb_peek(&ppp
->mrq
);
2068 if (seq_before(ppp
->minseq
, PPP_MP_CB(mskb
)->sequence
))
2069 ppp
->minseq
= PPP_MP_CB(mskb
)->sequence
;
2072 /* Pull completed packets off the queue and receive them. */
2073 while ((skb
= ppp_mp_reconstruct(ppp
))) {
2074 if (pskb_may_pull(skb
, 2))
2075 ppp_receive_nonmp_frame(ppp
, skb
);
2077 ++ppp
->dev
->stats
.rx_length_errors
;
2079 ppp_receive_error(ppp
);
2087 ppp_receive_error(ppp
);
2091 * Insert a fragment on the MP reconstruction queue.
2092 * The queue is ordered by increasing sequence number.
2095 ppp_mp_insert(struct ppp
*ppp
, struct sk_buff
*skb
)
2098 struct sk_buff_head
*list
= &ppp
->mrq
;
2099 u32 seq
= PPP_MP_CB(skb
)->sequence
;
2101 /* N.B. we don't need to lock the list lock because we have the
2102 ppp unit receive-side lock. */
2103 skb_queue_walk(list
, p
) {
2104 if (seq_before(seq
, PPP_MP_CB(p
)->sequence
))
2107 __skb_queue_before(list
, p
, skb
);
2111 * Reconstruct a packet from the MP fragment queue.
2112 * We go through increasing sequence numbers until we find a
2113 * complete packet, or we get to the sequence number for a fragment
2114 * which hasn't arrived but might still do so.
2116 static struct sk_buff
*
2117 ppp_mp_reconstruct(struct ppp
*ppp
)
2119 u32 seq
= ppp
->nextseq
;
2120 u32 minseq
= ppp
->minseq
;
2121 struct sk_buff_head
*list
= &ppp
->mrq
;
2122 struct sk_buff
*p
, *tmp
;
2123 struct sk_buff
*head
, *tail
;
2124 struct sk_buff
*skb
= NULL
;
2125 int lost
= 0, len
= 0;
2127 if (ppp
->mrru
== 0) /* do nothing until mrru is set */
2131 skb_queue_walk_safe(list
, p
, tmp
) {
2133 if (seq_before(PPP_MP_CB(p
)->sequence
, seq
)) {
2134 /* this can't happen, anyway ignore the skb */
2135 netdev_err(ppp
->dev
, "ppp_mp_reconstruct bad "
2137 PPP_MP_CB(p
)->sequence
, seq
);
2138 __skb_unlink(p
, list
);
2142 if (PPP_MP_CB(p
)->sequence
!= seq
) {
2144 /* Fragment `seq' is missing. If it is after
2145 minseq, it might arrive later, so stop here. */
2146 if (seq_after(seq
, minseq
))
2148 /* Fragment `seq' is lost, keep going. */
2151 seq
= seq_before(minseq
, PPP_MP_CB(p
)->sequence
)?
2152 minseq
+ 1: PPP_MP_CB(p
)->sequence
;
2155 netdev_printk(KERN_DEBUG
, ppp
->dev
,
2156 "lost frag %u..%u\n",
2163 * At this point we know that all the fragments from
2164 * ppp->nextseq to seq are either present or lost.
2165 * Also, there are no complete packets in the queue
2166 * that have no missing fragments and end before this
2170 /* B bit set indicates this fragment starts a packet */
2171 if (PPP_MP_CB(p
)->BEbits
& B
) {
2179 /* Got a complete packet yet? */
2180 if (lost
== 0 && (PPP_MP_CB(p
)->BEbits
& E
) &&
2181 (PPP_MP_CB(head
)->BEbits
& B
)) {
2182 if (len
> ppp
->mrru
+ 2) {
2183 ++ppp
->dev
->stats
.rx_length_errors
;
2184 netdev_printk(KERN_DEBUG
, ppp
->dev
,
2185 "PPP: reconstructed packet"
2186 " is too long (%d)\n", len
);
2191 ppp
->nextseq
= seq
+ 1;
2195 * If this is the ending fragment of a packet,
2196 * and we haven't found a complete valid packet yet,
2197 * we can discard up to and including this fragment.
2199 if (PPP_MP_CB(p
)->BEbits
& E
) {
2200 struct sk_buff
*tmp2
;
2202 skb_queue_reverse_walk_from_safe(list
, p
, tmp2
) {
2204 netdev_printk(KERN_DEBUG
, ppp
->dev
,
2205 "discarding frag %u\n",
2206 PPP_MP_CB(p
)->sequence
);
2207 __skb_unlink(p
, list
);
2210 head
= skb_peek(list
);
2217 /* If we have a complete packet, copy it all into one skb. */
2219 /* If we have discarded any fragments,
2220 signal a receive error. */
2221 if (PPP_MP_CB(head
)->sequence
!= ppp
->nextseq
) {
2222 skb_queue_walk_safe(list
, p
, tmp
) {
2226 netdev_printk(KERN_DEBUG
, ppp
->dev
,
2227 "discarding frag %u\n",
2228 PPP_MP_CB(p
)->sequence
);
2229 __skb_unlink(p
, list
);
2234 netdev_printk(KERN_DEBUG
, ppp
->dev
,
2235 " missed pkts %u..%u\n",
2237 PPP_MP_CB(head
)->sequence
-1);
2238 ++ppp
->dev
->stats
.rx_dropped
;
2239 ppp_receive_error(ppp
);
2244 struct sk_buff
**fragpp
= &skb_shinfo(skb
)->frag_list
;
2245 p
= skb_queue_next(list
, head
);
2246 __skb_unlink(skb
, list
);
2247 skb_queue_walk_from_safe(list
, p
, tmp
) {
2248 __skb_unlink(p
, list
);
2254 skb
->data_len
+= p
->len
;
2255 skb
->truesize
+= p
->truesize
;
2261 __skb_unlink(skb
, list
);
2264 ppp
->nextseq
= PPP_MP_CB(tail
)->sequence
+ 1;
2269 #endif /* CONFIG_PPP_MULTILINK */
2272 * Channel interface.
2275 /* Create a new, unattached ppp channel. */
2276 int ppp_register_channel(struct ppp_channel
*chan
)
2278 return ppp_register_net_channel(current
->nsproxy
->net_ns
, chan
);
2281 /* Create a new, unattached ppp channel for specified net. */
2282 int ppp_register_net_channel(struct net
*net
, struct ppp_channel
*chan
)
2284 struct channel
*pch
;
2287 pch
= kzalloc(sizeof(struct channel
), GFP_KERNEL
);
2291 pn
= ppp_pernet(net
);
2295 pch
->chan_net
= net
;
2297 init_ppp_file(&pch
->file
, CHANNEL
);
2298 pch
->file
.hdrlen
= chan
->hdrlen
;
2299 #ifdef CONFIG_PPP_MULTILINK
2301 #endif /* CONFIG_PPP_MULTILINK */
2302 init_rwsem(&pch
->chan_sem
);
2303 spin_lock_init(&pch
->downl
);
2304 rwlock_init(&pch
->upl
);
2306 spin_lock_bh(&pn
->all_channels_lock
);
2307 pch
->file
.index
= ++pn
->last_channel_index
;
2308 list_add(&pch
->list
, &pn
->new_channels
);
2309 atomic_inc(&channel_count
);
2310 spin_unlock_bh(&pn
->all_channels_lock
);
2316 * Return the index of a channel.
2318 int ppp_channel_index(struct ppp_channel
*chan
)
2320 struct channel
*pch
= chan
->ppp
;
2323 return pch
->file
.index
;
2328 * Return the PPP unit number to which a channel is connected.
2330 int ppp_unit_number(struct ppp_channel
*chan
)
2332 struct channel
*pch
= chan
->ppp
;
2336 read_lock_bh(&pch
->upl
);
2338 unit
= pch
->ppp
->file
.index
;
2339 read_unlock_bh(&pch
->upl
);
2345 * Return the PPP device interface name of a channel.
2347 char *ppp_dev_name(struct ppp_channel
*chan
)
2349 struct channel
*pch
= chan
->ppp
;
2353 read_lock_bh(&pch
->upl
);
2354 if (pch
->ppp
&& pch
->ppp
->dev
)
2355 name
= pch
->ppp
->dev
->name
;
2356 read_unlock_bh(&pch
->upl
);
2363 * Disconnect a channel from the generic layer.
2364 * This must be called in process context.
2367 ppp_unregister_channel(struct ppp_channel
*chan
)
2369 struct channel
*pch
= chan
->ppp
;
2373 return; /* should never happen */
2378 * This ensures that we have returned from any calls into the
2379 * the channel's start_xmit or ioctl routine before we proceed.
2381 down_write(&pch
->chan_sem
);
2382 spin_lock_bh(&pch
->downl
);
2384 spin_unlock_bh(&pch
->downl
);
2385 up_write(&pch
->chan_sem
);
2386 ppp_disconnect_channel(pch
);
2388 pn
= ppp_pernet(pch
->chan_net
);
2389 spin_lock_bh(&pn
->all_channels_lock
);
2390 list_del(&pch
->list
);
2391 spin_unlock_bh(&pn
->all_channels_lock
);
2394 wake_up_interruptible(&pch
->file
.rwait
);
2395 if (atomic_dec_and_test(&pch
->file
.refcnt
))
2396 ppp_destroy_channel(pch
);
2400 * Callback from a channel when it can accept more to transmit.
2401 * This should be called at BH/softirq level, not interrupt level.
2404 ppp_output_wakeup(struct ppp_channel
*chan
)
2406 struct channel
*pch
= chan
->ppp
;
2410 ppp_channel_push(pch
);
2414 * Compression control.
2417 /* Process the PPPIOCSCOMPRESS ioctl. */
2419 ppp_set_compress(struct ppp
*ppp
, unsigned long arg
)
2422 struct compressor
*cp
, *ocomp
;
2423 struct ppp_option_data data
;
2424 void *state
, *ostate
;
2425 unsigned char ccp_option
[CCP_MAX_OPTION_LENGTH
];
2428 if (copy_from_user(&data
, (void __user
*) arg
, sizeof(data
)) ||
2429 (data
.length
<= CCP_MAX_OPTION_LENGTH
&&
2430 copy_from_user(ccp_option
, (void __user
*) data
.ptr
, data
.length
)))
2433 if (data
.length
> CCP_MAX_OPTION_LENGTH
||
2434 ccp_option
[1] < 2 || ccp_option
[1] > data
.length
)
2437 cp
= try_then_request_module(
2438 find_compressor(ccp_option
[0]),
2439 "ppp-compress-%d", ccp_option
[0]);
2444 if (data
.transmit
) {
2445 state
= cp
->comp_alloc(ccp_option
, data
.length
);
2448 ppp
->xstate
&= ~SC_COMP_RUN
;
2450 ostate
= ppp
->xc_state
;
2452 ppp
->xc_state
= state
;
2453 ppp_xmit_unlock(ppp
);
2455 ocomp
->comp_free(ostate
);
2456 module_put(ocomp
->owner
);
2460 module_put(cp
->owner
);
2463 state
= cp
->decomp_alloc(ccp_option
, data
.length
);
2466 ppp
->rstate
&= ~SC_DECOMP_RUN
;
2468 ostate
= ppp
->rc_state
;
2470 ppp
->rc_state
= state
;
2471 ppp_recv_unlock(ppp
);
2473 ocomp
->decomp_free(ostate
);
2474 module_put(ocomp
->owner
);
2478 module_put(cp
->owner
);
2486 * Look at a CCP packet and update our state accordingly.
2487 * We assume the caller has the xmit or recv path locked.
2490 ppp_ccp_peek(struct ppp
*ppp
, struct sk_buff
*skb
, int inbound
)
2495 if (!pskb_may_pull(skb
, CCP_HDRLEN
+ 2))
2496 return; /* no header */
2499 switch (CCP_CODE(dp
)) {
2502 /* A ConfReq starts negotiation of compression
2503 * in one direction of transmission,
2504 * and hence brings it down...but which way?
2507 * A ConfReq indicates what the sender would like to receive
2510 /* He is proposing what I should send */
2511 ppp
->xstate
&= ~SC_COMP_RUN
;
2513 /* I am proposing to what he should send */
2514 ppp
->rstate
&= ~SC_DECOMP_RUN
;
2521 * CCP is going down, both directions of transmission
2523 ppp
->rstate
&= ~SC_DECOMP_RUN
;
2524 ppp
->xstate
&= ~SC_COMP_RUN
;
2528 if ((ppp
->flags
& (SC_CCP_OPEN
| SC_CCP_UP
)) != SC_CCP_OPEN
)
2530 len
= CCP_LENGTH(dp
);
2531 if (!pskb_may_pull(skb
, len
+ 2))
2532 return; /* too short */
2535 if (len
< CCP_OPT_MINLEN
|| len
< CCP_OPT_LENGTH(dp
))
2538 /* we will start receiving compressed packets */
2541 if (ppp
->rcomp
->decomp_init(ppp
->rc_state
, dp
, len
,
2542 ppp
->file
.index
, 0, ppp
->mru
, ppp
->debug
)) {
2543 ppp
->rstate
|= SC_DECOMP_RUN
;
2544 ppp
->rstate
&= ~(SC_DC_ERROR
| SC_DC_FERROR
);
2547 /* we will soon start sending compressed packets */
2550 if (ppp
->xcomp
->comp_init(ppp
->xc_state
, dp
, len
,
2551 ppp
->file
.index
, 0, ppp
->debug
))
2552 ppp
->xstate
|= SC_COMP_RUN
;
2557 /* reset the [de]compressor */
2558 if ((ppp
->flags
& SC_CCP_UP
) == 0)
2561 if (ppp
->rc_state
&& (ppp
->rstate
& SC_DECOMP_RUN
)) {
2562 ppp
->rcomp
->decomp_reset(ppp
->rc_state
);
2563 ppp
->rstate
&= ~SC_DC_ERROR
;
2566 if (ppp
->xc_state
&& (ppp
->xstate
& SC_COMP_RUN
))
2567 ppp
->xcomp
->comp_reset(ppp
->xc_state
);
2573 /* Free up compression resources. */
2575 ppp_ccp_closed(struct ppp
*ppp
)
2577 void *xstate
, *rstate
;
2578 struct compressor
*xcomp
, *rcomp
;
2581 ppp
->flags
&= ~(SC_CCP_OPEN
| SC_CCP_UP
);
2584 xstate
= ppp
->xc_state
;
2585 ppp
->xc_state
= NULL
;
2588 rstate
= ppp
->rc_state
;
2589 ppp
->rc_state
= NULL
;
2593 xcomp
->comp_free(xstate
);
2594 module_put(xcomp
->owner
);
2597 rcomp
->decomp_free(rstate
);
2598 module_put(rcomp
->owner
);
2602 /* List of compressors. */
2603 static LIST_HEAD(compressor_list
);
2604 static DEFINE_SPINLOCK(compressor_list_lock
);
2606 struct compressor_entry
{
2607 struct list_head list
;
2608 struct compressor
*comp
;
2611 static struct compressor_entry
*
2612 find_comp_entry(int proto
)
2614 struct compressor_entry
*ce
;
2616 list_for_each_entry(ce
, &compressor_list
, list
) {
2617 if (ce
->comp
->compress_proto
== proto
)
2623 /* Register a compressor */
2625 ppp_register_compressor(struct compressor
*cp
)
2627 struct compressor_entry
*ce
;
2629 spin_lock(&compressor_list_lock
);
2631 if (find_comp_entry(cp
->compress_proto
))
2634 ce
= kmalloc(sizeof(struct compressor_entry
), GFP_ATOMIC
);
2639 list_add(&ce
->list
, &compressor_list
);
2641 spin_unlock(&compressor_list_lock
);
2645 /* Unregister a compressor */
2647 ppp_unregister_compressor(struct compressor
*cp
)
2649 struct compressor_entry
*ce
;
2651 spin_lock(&compressor_list_lock
);
2652 ce
= find_comp_entry(cp
->compress_proto
);
2653 if (ce
&& ce
->comp
== cp
) {
2654 list_del(&ce
->list
);
2657 spin_unlock(&compressor_list_lock
);
2660 /* Find a compressor. */
2661 static struct compressor
*
2662 find_compressor(int type
)
2664 struct compressor_entry
*ce
;
2665 struct compressor
*cp
= NULL
;
2667 spin_lock(&compressor_list_lock
);
2668 ce
= find_comp_entry(type
);
2671 if (!try_module_get(cp
->owner
))
2674 spin_unlock(&compressor_list_lock
);
2679 * Miscelleneous stuff.
2683 ppp_get_stats(struct ppp
*ppp
, struct ppp_stats
*st
)
2685 struct slcompress
*vj
= ppp
->vj
;
2687 memset(st
, 0, sizeof(*st
));
2688 st
->p
.ppp_ipackets
= ppp
->stats64
.rx_packets
;
2689 st
->p
.ppp_ierrors
= ppp
->dev
->stats
.rx_errors
;
2690 st
->p
.ppp_ibytes
= ppp
->stats64
.rx_bytes
;
2691 st
->p
.ppp_opackets
= ppp
->stats64
.tx_packets
;
2692 st
->p
.ppp_oerrors
= ppp
->dev
->stats
.tx_errors
;
2693 st
->p
.ppp_obytes
= ppp
->stats64
.tx_bytes
;
2696 st
->vj
.vjs_packets
= vj
->sls_o_compressed
+ vj
->sls_o_uncompressed
;
2697 st
->vj
.vjs_compressed
= vj
->sls_o_compressed
;
2698 st
->vj
.vjs_searches
= vj
->sls_o_searches
;
2699 st
->vj
.vjs_misses
= vj
->sls_o_misses
;
2700 st
->vj
.vjs_errorin
= vj
->sls_i_error
;
2701 st
->vj
.vjs_tossed
= vj
->sls_i_tossed
;
2702 st
->vj
.vjs_uncompressedin
= vj
->sls_i_uncompressed
;
2703 st
->vj
.vjs_compressedin
= vj
->sls_i_compressed
;
2707 * Stuff for handling the lists of ppp units and channels
2708 * and for initialization.
2712 * Create a new ppp interface unit. Fails if it can't allocate memory
2713 * or if there is already a unit with the requested number.
2714 * unit == -1 means allocate a new number.
2716 static struct ppp
*ppp_create_interface(struct net
*net
, int unit
,
2717 struct file
*file
, int *retp
)
2721 struct net_device
*dev
= NULL
;
2725 dev
= alloc_netdev(sizeof(struct ppp
), "", NET_NAME_UNKNOWN
,
2730 pn
= ppp_pernet(net
);
2732 ppp
= netdev_priv(dev
);
2735 init_ppp_file(&ppp
->file
, INTERFACE
);
2736 ppp
->file
.hdrlen
= PPP_HDRLEN
- 2; /* don't count proto bytes */
2738 for (i
= 0; i
< NUM_NP
; ++i
)
2739 ppp
->npmode
[i
] = NPMODE_PASS
;
2740 INIT_LIST_HEAD(&ppp
->channels
);
2741 spin_lock_init(&ppp
->rlock
);
2742 spin_lock_init(&ppp
->wlock
);
2743 #ifdef CONFIG_PPP_MULTILINK
2745 skb_queue_head_init(&ppp
->mrq
);
2746 #endif /* CONFIG_PPP_MULTILINK */
2747 #ifdef CONFIG_PPP_FILTER
2748 ppp
->pass_filter
= NULL
;
2749 ppp
->active_filter
= NULL
;
2750 #endif /* CONFIG_PPP_FILTER */
2753 * drum roll: don't forget to set
2754 * the net device is belong to
2756 dev_net_set(dev
, net
);
2758 mutex_lock(&pn
->all_ppp_mutex
);
2761 unit
= unit_get(&pn
->units_idr
, ppp
);
2768 if (unit_find(&pn
->units_idr
, unit
))
2769 goto out2
; /* unit already exists */
2771 * if caller need a specified unit number
2772 * lets try to satisfy him, otherwise --
2773 * he should better ask us for new unit number
2775 * NOTE: yes I know that returning EEXIST it's not
2776 * fair but at least pppd will ask us to allocate
2777 * new unit in this case so user is happy :)
2779 unit
= unit_set(&pn
->units_idr
, ppp
, unit
);
2784 /* Initialize the new ppp unit */
2785 ppp
->file
.index
= unit
;
2786 sprintf(dev
->name
, "ppp%d", unit
);
2788 ret
= register_netdev(dev
);
2790 unit_put(&pn
->units_idr
, unit
);
2791 netdev_err(ppp
->dev
, "PPP: couldn't register device %s (%d)\n",
2798 atomic_inc(&ppp_unit_count
);
2799 mutex_unlock(&pn
->all_ppp_mutex
);
2805 mutex_unlock(&pn
->all_ppp_mutex
);
2813 * Initialize a ppp_file structure.
2816 init_ppp_file(struct ppp_file
*pf
, int kind
)
2819 skb_queue_head_init(&pf
->xq
);
2820 skb_queue_head_init(&pf
->rq
);
2821 atomic_set(&pf
->refcnt
, 1);
2822 init_waitqueue_head(&pf
->rwait
);
2826 * Free the memory used by a ppp unit. This is only called once
2827 * there are no channels connected to the unit and no file structs
2828 * that reference the unit.
2830 static void ppp_destroy_interface(struct ppp
*ppp
)
2832 atomic_dec(&ppp_unit_count
);
2834 if (!ppp
->file
.dead
|| ppp
->n_channels
) {
2835 /* "can't happen" */
2836 netdev_err(ppp
->dev
, "ppp: destroying ppp struct %p "
2837 "but dead=%d n_channels=%d !\n",
2838 ppp
, ppp
->file
.dead
, ppp
->n_channels
);
2842 ppp_ccp_closed(ppp
);
2847 skb_queue_purge(&ppp
->file
.xq
);
2848 skb_queue_purge(&ppp
->file
.rq
);
2849 #ifdef CONFIG_PPP_MULTILINK
2850 skb_queue_purge(&ppp
->mrq
);
2851 #endif /* CONFIG_PPP_MULTILINK */
2852 #ifdef CONFIG_PPP_FILTER
2853 if (ppp
->pass_filter
) {
2854 bpf_prog_destroy(ppp
->pass_filter
);
2855 ppp
->pass_filter
= NULL
;
2858 if (ppp
->active_filter
) {
2859 bpf_prog_destroy(ppp
->active_filter
);
2860 ppp
->active_filter
= NULL
;
2862 #endif /* CONFIG_PPP_FILTER */
2864 kfree_skb(ppp
->xmit_pending
);
2866 free_netdev(ppp
->dev
);
2870 * Locate an existing ppp unit.
2871 * The caller should have locked the all_ppp_mutex.
2874 ppp_find_unit(struct ppp_net
*pn
, int unit
)
2876 return unit_find(&pn
->units_idr
, unit
);
2880 * Locate an existing ppp channel.
2881 * The caller should have locked the all_channels_lock.
2882 * First we look in the new_channels list, then in the
2883 * all_channels list. If found in the new_channels list,
2884 * we move it to the all_channels list. This is for speed
2885 * when we have a lot of channels in use.
2887 static struct channel
*
2888 ppp_find_channel(struct ppp_net
*pn
, int unit
)
2890 struct channel
*pch
;
2892 list_for_each_entry(pch
, &pn
->new_channels
, list
) {
2893 if (pch
->file
.index
== unit
) {
2894 list_move(&pch
->list
, &pn
->all_channels
);
2899 list_for_each_entry(pch
, &pn
->all_channels
, list
) {
2900 if (pch
->file
.index
== unit
)
2908 * Connect a PPP channel to a PPP interface unit.
2911 ppp_connect_channel(struct channel
*pch
, int unit
)
2918 pn
= ppp_pernet(pch
->chan_net
);
2920 mutex_lock(&pn
->all_ppp_mutex
);
2921 ppp
= ppp_find_unit(pn
, unit
);
2924 write_lock_bh(&pch
->upl
);
2930 if (pch
->file
.hdrlen
> ppp
->file
.hdrlen
)
2931 ppp
->file
.hdrlen
= pch
->file
.hdrlen
;
2932 hdrlen
= pch
->file
.hdrlen
+ 2; /* for protocol bytes */
2933 if (hdrlen
> ppp
->dev
->hard_header_len
)
2934 ppp
->dev
->hard_header_len
= hdrlen
;
2935 list_add_tail(&pch
->clist
, &ppp
->channels
);
2938 atomic_inc(&ppp
->file
.refcnt
);
2943 write_unlock_bh(&pch
->upl
);
2945 mutex_unlock(&pn
->all_ppp_mutex
);
2950 * Disconnect a channel from its ppp unit.
2953 ppp_disconnect_channel(struct channel
*pch
)
2958 write_lock_bh(&pch
->upl
);
2961 write_unlock_bh(&pch
->upl
);
2963 /* remove it from the ppp unit's list */
2965 list_del(&pch
->clist
);
2966 if (--ppp
->n_channels
== 0)
2967 wake_up_interruptible(&ppp
->file
.rwait
);
2969 if (atomic_dec_and_test(&ppp
->file
.refcnt
))
2970 ppp_destroy_interface(ppp
);
2977 * Free up the resources used by a ppp channel.
2979 static void ppp_destroy_channel(struct channel
*pch
)
2981 atomic_dec(&channel_count
);
2983 if (!pch
->file
.dead
) {
2984 /* "can't happen" */
2985 pr_err("ppp: destroying undead channel %p !\n", pch
);
2988 skb_queue_purge(&pch
->file
.xq
);
2989 skb_queue_purge(&pch
->file
.rq
);
2993 static void __exit
ppp_cleanup(void)
2995 /* should never happen */
2996 if (atomic_read(&ppp_unit_count
) || atomic_read(&channel_count
))
2997 pr_err("PPP: removing module but units remain!\n");
2998 unregister_chrdev(PPP_MAJOR
, "ppp");
2999 device_destroy(ppp_class
, MKDEV(PPP_MAJOR
, 0));
3000 class_destroy(ppp_class
);
3001 unregister_pernet_device(&ppp_net_ops
);
3005 * Units handling. Caller must protect concurrent access
3006 * by holding all_ppp_mutex
3009 /* associate pointer with specified number */
3010 static int unit_set(struct idr
*p
, void *ptr
, int n
)
3014 unit
= idr_alloc(p
, ptr
, n
, n
+ 1, GFP_KERNEL
);
3015 if (unit
== -ENOSPC
)
3020 /* get new free unit number and associate pointer with it */
3021 static int unit_get(struct idr
*p
, void *ptr
)
3023 return idr_alloc(p
, ptr
, 0, 0, GFP_KERNEL
);
3026 /* put unit number back to a pool */
3027 static void unit_put(struct idr
*p
, int n
)
3032 /* get pointer associated with the number */
3033 static void *unit_find(struct idr
*p
, int n
)
3035 return idr_find(p
, n
);
3038 /* Module/initialization stuff */
3040 module_init(ppp_init
);
3041 module_exit(ppp_cleanup
);
3043 EXPORT_SYMBOL(ppp_register_net_channel
);
3044 EXPORT_SYMBOL(ppp_register_channel
);
3045 EXPORT_SYMBOL(ppp_unregister_channel
);
3046 EXPORT_SYMBOL(ppp_channel_index
);
3047 EXPORT_SYMBOL(ppp_unit_number
);
3048 EXPORT_SYMBOL(ppp_dev_name
);
3049 EXPORT_SYMBOL(ppp_input
);
3050 EXPORT_SYMBOL(ppp_input_error
);
3051 EXPORT_SYMBOL(ppp_output_wakeup
);
3052 EXPORT_SYMBOL(ppp_register_compressor
);
3053 EXPORT_SYMBOL(ppp_unregister_compressor
);
3054 MODULE_LICENSE("GPL");
3055 MODULE_ALIAS_CHARDEV(PPP_MAJOR
, 0);
3056 MODULE_ALIAS("devname:ppp");