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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / drivers / net / ppp / pptp.c
blobae0905ed4a32b55183568e95512c6727458a9f96
1 /*
2 * Point-to-Point Tunneling Protocol for Linux
3 *
4 * Authors: Dmitry Kozlov <xeb@mail.ru>
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 */
12
13 #include <linux/string.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/errno.h>
18 #include <linux/netdevice.h>
19 #include <linux/net.h>
20 #include <linux/skbuff.h>
21 #include <linux/vmalloc.h>
22 #include <linux/init.h>
23 #include <linux/ppp_channel.h>
24 #include <linux/ppp_defs.h>
25 #include <linux/if_pppox.h>
26 #include <linux/ppp-ioctl.h>
27 #include <linux/notifier.h>
28 #include <linux/file.h>
29 #include <linux/in.h>
30 #include <linux/ip.h>
31 #include <linux/rcupdate.h>
32 #include <linux/spinlock.h>
33
34 #include <net/sock.h>
35 #include <net/protocol.h>
36 #include <net/ip.h>
37 #include <net/icmp.h>
38 #include <net/route.h>
39 #include <net/gre.h>
40
41 #include <linux/uaccess.h>
42
43 #define PPTP_DRIVER_VERSION "0.8.5"
44
45 #define MAX_CALLID 65535
46
47 static DECLARE_BITMAP(callid_bitmap, MAX_CALLID + 1);
48 static struct pppox_sock __rcu **callid_sock;
49
50 static DEFINE_SPINLOCK(chan_lock);
51
52 static struct proto pptp_sk_proto __read_mostly;
53 static const struct ppp_channel_ops pptp_chan_ops;
54 static const struct proto_ops pptp_ops;
55
56 #define PPP_LCP_ECHOREQ 0x09
57 #define PPP_LCP_ECHOREP 0x0A
58 #define SC_RCV_BITS (SC_RCV_B7_1|SC_RCV_B7_0|SC_RCV_ODDP|SC_RCV_EVNP)
59
60 #define MISSING_WINDOW 20
61 #define WRAPPED(curseq, lastseq)\
62 ((((curseq) & 0xffffff00) == 0) &&\
63 (((lastseq) & 0xffffff00) == 0xffffff00))
64
65 #define PPTP_GRE_PROTO 0x880B
66 #define PPTP_GRE_VER 0x1
67
68 #define PPTP_GRE_FLAG_C 0x80
69 #define PPTP_GRE_FLAG_R 0x40
70 #define PPTP_GRE_FLAG_K 0x20
71 #define PPTP_GRE_FLAG_S 0x10
72 #define PPTP_GRE_FLAG_A 0x80
73
74 #define PPTP_GRE_IS_C(f) ((f)&PPTP_GRE_FLAG_C)
75 #define PPTP_GRE_IS_R(f) ((f)&PPTP_GRE_FLAG_R)
76 #define PPTP_GRE_IS_K(f) ((f)&PPTP_GRE_FLAG_K)
77 #define PPTP_GRE_IS_S(f) ((f)&PPTP_GRE_FLAG_S)
78 #define PPTP_GRE_IS_A(f) ((f)&PPTP_GRE_FLAG_A)
79
80 #define PPTP_HEADER_OVERHEAD (2+sizeof(struct pptp_gre_header))
81 struct pptp_gre_header {
82 u8 flags;
83 u8 ver;
84 __be16 protocol;
85 __be16 payload_len;
86 __be16 call_id;
87 __be32 seq;
88 __be32 ack;
89 } __packed;
90
91 static struct pppox_sock *lookup_chan(u16 call_id, __be32 s_addr)
92 {
93 struct pppox_sock *sock;
94 struct pptp_opt *opt;
95
96 rcu_read_lock();
97 sock = rcu_dereference(callid_sock[call_id]);
98 if (sock) {
99 opt = &sock->proto.pptp;
100 if (opt->dst_addr.sin_addr.s_addr != s_addr)
101 sock = NULL;
102 else
103 sock_hold(sk_pppox(sock));
104 }
105 rcu_read_unlock();
106
107 return sock;
108 }
109
110 static int lookup_chan_dst(u16 call_id, __be32 d_addr)
111 {
112 struct pppox_sock *sock;
113 struct pptp_opt *opt;
114 int i;
115
116 rcu_read_lock();
117 i = 1;
118 for_each_set_bit_from(i, callid_bitmap, MAX_CALLID) {
119 sock = rcu_dereference(callid_sock[i]);
120 if (!sock)
121 continue;
122 opt = &sock->proto.pptp;
123 if (opt->dst_addr.call_id == call_id &&
124 opt->dst_addr.sin_addr.s_addr == d_addr)
125 break;
126 }
127 rcu_read_unlock();
128
129 return i < MAX_CALLID;
130 }
131
132 static int add_chan(struct pppox_sock *sock,
133 struct pptp_addr *sa)
134 {
135 static int call_id;
136
137 spin_lock(&chan_lock);
138 if (!sa->call_id) {
139 call_id = find_next_zero_bit(callid_bitmap, MAX_CALLID, call_id + 1);
140 if (call_id == MAX_CALLID) {
141 call_id = find_next_zero_bit(callid_bitmap, MAX_CALLID, 1);
142 if (call_id == MAX_CALLID)
143 goto out_err;
144 }
145 sa->call_id = call_id;
146 } else if (test_bit(sa->call_id, callid_bitmap)) {
147 goto out_err;
148 }
149
150 sock->proto.pptp.src_addr = *sa;
151 set_bit(sa->call_id, callid_bitmap);
152 rcu_assign_pointer(callid_sock[sa->call_id], sock);
153 spin_unlock(&chan_lock);
154
155 return 0;
156
157 out_err:
158 spin_unlock(&chan_lock);
159 return -1;
160 }
161
162 static void del_chan(struct pppox_sock *sock)
163 {
164 spin_lock(&chan_lock);
165 clear_bit(sock->proto.pptp.src_addr.call_id, callid_bitmap);
166 RCU_INIT_POINTER(callid_sock[sock->proto.pptp.src_addr.call_id], NULL);
167 spin_unlock(&chan_lock);
168 synchronize_rcu();
169 }
170
171 static int pptp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
172 {
173 struct sock *sk = (struct sock *) chan->private;
174 struct pppox_sock *po = pppox_sk(sk);
175 struct net *net = sock_net(sk);
176 struct pptp_opt *opt = &po->proto.pptp;
177 struct pptp_gre_header *hdr;
178 unsigned int header_len = sizeof(*hdr);
179 struct flowi4 fl4;
180 int islcp;
181 int len;
182 unsigned char *data;
183 __u32 seq_recv;
184
185
186 struct rtable *rt;
187 struct net_device *tdev;
188 struct iphdr *iph;
189 int max_headroom;
190
191 if (sk_pppox(po)->sk_state & PPPOX_DEAD)
192 goto tx_error;
193
194 rt = ip_route_output_ports(net, &fl4, NULL,
195 opt->dst_addr.sin_addr.s_addr,
196 opt->src_addr.sin_addr.s_addr,
197 0, 0, IPPROTO_GRE,
198 RT_TOS(0), 0);
199 if (IS_ERR(rt))
200 goto tx_error;
201
202 tdev = rt->dst.dev;
203
204 max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(*iph) + sizeof(*hdr) + 2;
205
206 if (skb_headroom(skb) < max_headroom || skb_cloned(skb) || skb_shared(skb)) {
207 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
208 if (!new_skb) {
209 ip_rt_put(rt);
210 goto tx_error;
211 }
212 if (skb->sk)
213 skb_set_owner_w(new_skb, skb->sk);
214 consume_skb(skb);
215 skb = new_skb;
216 }
217
218 data = skb->data;
219 islcp = ((data[0] << 8) + data[1]) == PPP_LCP && 1 <= data[2] && data[2] <= 7;
220
221 /* compress protocol field */
222 if ((opt->ppp_flags & SC_COMP_PROT) && data[0] == 0 && !islcp)
223 skb_pull(skb, 1);
224
225 /* Put in the address/control bytes if necessary */
226 if ((opt->ppp_flags & SC_COMP_AC) == 0 || islcp) {
227 data = skb_push(skb, 2);
228 data[0] = PPP_ALLSTATIONS;
229 data[1] = PPP_UI;
230 }
231
232 len = skb->len;
233
234 seq_recv = opt->seq_recv;
235
236 if (opt->ack_sent == seq_recv)
237 header_len -= sizeof(hdr->ack);
238
239 /* Push down and install GRE header */
240 skb_push(skb, header_len);
241 hdr = (struct pptp_gre_header *)(skb->data);
242
243 hdr->flags = PPTP_GRE_FLAG_K;
244 hdr->ver = PPTP_GRE_VER;
245 hdr->protocol = htons(PPTP_GRE_PROTO);
246 hdr->call_id = htons(opt->dst_addr.call_id);
247
248 hdr->flags |= PPTP_GRE_FLAG_S;
249 hdr->seq = htonl(++opt->seq_sent);
250 if (opt->ack_sent != seq_recv) {
251 /* send ack with this message */
252 hdr->ver |= PPTP_GRE_FLAG_A;
253 hdr->ack = htonl(seq_recv);
254 opt->ack_sent = seq_recv;
255 }
256 hdr->payload_len = htons(len);
257
258 /* Push down and install the IP header. */
259
260 skb_reset_transport_header(skb);
261 skb_push(skb, sizeof(*iph));
262 skb_reset_network_header(skb);
263 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
264 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | IPSKB_REROUTED);
265
266 iph = ip_hdr(skb);
267 iph->version = 4;
268 iph->ihl = sizeof(struct iphdr) >> 2;
269 if (ip_dont_fragment(sk, &rt->dst))
270 iph->frag_off = htons(IP_DF);
271 else
272 iph->frag_off = 0;
273 iph->protocol = IPPROTO_GRE;
274 iph->tos = 0;
275 iph->daddr = fl4.daddr;
276 iph->saddr = fl4.saddr;
277 iph->ttl = ip4_dst_hoplimit(&rt->dst);
278 iph->tot_len = htons(skb->len);
279
280 skb_dst_drop(skb);
281 skb_dst_set(skb, &rt->dst);
282
283 nf_reset(skb);
284
285 skb->ip_summed = CHECKSUM_NONE;
286 ip_select_ident(net, skb, NULL);
287 ip_send_check(iph);
288
289 ip_local_out(net, skb->sk, skb);
290 return 1;
291
292 tx_error:
293 kfree_skb(skb);
294 return 1;
295 }
296
297 static int pptp_rcv_core(struct sock *sk, struct sk_buff *skb)
298 {
299 struct pppox_sock *po = pppox_sk(sk);
300 struct pptp_opt *opt = &po->proto.pptp;
301 int headersize, payload_len, seq;
302 __u8 *payload;
303 struct pptp_gre_header *header;
304
305 if (!(sk->sk_state & PPPOX_CONNECTED)) {
306 if (sock_queue_rcv_skb(sk, skb))
307 goto drop;
308 return NET_RX_SUCCESS;
309 }
310
311 header = (struct pptp_gre_header *)(skb->data);
312 headersize = sizeof(*header);
313
314 /* test if acknowledgement present */
315 if (PPTP_GRE_IS_A(header->ver)) {
316 __u32 ack;
317
318 if (!pskb_may_pull(skb, headersize))
319 goto drop;
320 header = (struct pptp_gre_header *)(skb->data);
321
322 /* ack in different place if S = 0 */
323 ack = PPTP_GRE_IS_S(header->flags) ? header->ack : header->seq;
324
325 ack = ntohl(ack);
326
327 if (ack > opt->ack_recv)
328 opt->ack_recv = ack;
329 /* also handle sequence number wrap-around */
330 if (WRAPPED(ack, opt->ack_recv))
331 opt->ack_recv = ack;
332 } else {
333 headersize -= sizeof(header->ack);
334 }
335 /* test if payload present */
336 if (!PPTP_GRE_IS_S(header->flags))
337 goto drop;
338
339 payload_len = ntohs(header->payload_len);
340 seq = ntohl(header->seq);
341
342 /* check for incomplete packet (length smaller than expected) */
343 if (!pskb_may_pull(skb, headersize + payload_len))
344 goto drop;
345
346 payload = skb->data + headersize;
347 /* check for expected sequence number */
348 if (seq < opt->seq_recv + 1 || WRAPPED(opt->seq_recv, seq)) {
349 if ((payload[0] == PPP_ALLSTATIONS) && (payload[1] == PPP_UI) &&
350 (PPP_PROTOCOL(payload) == PPP_LCP) &&
351 ((payload[4] == PPP_LCP_ECHOREQ) || (payload[4] == PPP_LCP_ECHOREP)))
352 goto allow_packet;
353 } else {
354 opt->seq_recv = seq;
355 allow_packet:
356 skb_pull(skb, headersize);
357
358 if (payload[0] == PPP_ALLSTATIONS && payload[1] == PPP_UI) {
359 /* chop off address/control */
360 if (skb->len < 3)
361 goto drop;
362 skb_pull(skb, 2);
363 }
364
365 if ((*skb->data) & 1) {
366 /* protocol is compressed */
367 skb_push(skb, 1)[0] = 0;
368 }
369
370 skb->ip_summed = CHECKSUM_NONE;
371 skb_set_network_header(skb, skb->head-skb->data);
372 ppp_input(&po->chan, skb);
373
374 return NET_RX_SUCCESS;
375 }
376 drop:
377 kfree_skb(skb);
378 return NET_RX_DROP;
379 }
380
381 static int pptp_rcv(struct sk_buff *skb)
382 {
383 struct pppox_sock *po;
384 struct pptp_gre_header *header;
385 struct iphdr *iph;
386
387 if (skb->pkt_type != PACKET_HOST)
388 goto drop;
389
390 if (!pskb_may_pull(skb, 12))
391 goto drop;
392
393 iph = ip_hdr(skb);
394
395 header = (struct pptp_gre_header *)skb->data;
396
397 if (ntohs(header->protocol) != PPTP_GRE_PROTO || /* PPTP-GRE protocol for PPTP */
398 PPTP_GRE_IS_C(header->flags) || /* flag C should be clear */
399 PPTP_GRE_IS_R(header->flags) || /* flag R should be clear */
400 !PPTP_GRE_IS_K(header->flags) || /* flag K should be set */
401 (header->flags&0xF) != 0) /* routing and recursion ctrl = 0 */
402 /* if invalid, discard this packet */
403 goto drop;
404
405 po = lookup_chan(htons(header->call_id), iph->saddr);
406 if (po) {
407 skb_dst_drop(skb);
408 nf_reset(skb);
409 return sk_receive_skb(sk_pppox(po), skb, 0);
410 }
411 drop:
412 kfree_skb(skb);
413 return NET_RX_DROP;
414 }
415
416 static int pptp_bind(struct socket *sock, struct sockaddr *uservaddr,
417 int sockaddr_len)
418 {
419 struct sock *sk = sock->sk;
420 struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr;
421 struct pppox_sock *po = pppox_sk(sk);
422 int error = 0;
423
424 if (sockaddr_len < sizeof(struct sockaddr_pppox))
425 return -EINVAL;
426
427 lock_sock(sk);
428
429 if (sk->sk_state & PPPOX_DEAD) {
430 error = -EALREADY;
431 goto out;
432 }
433
434 if (sk->sk_state & PPPOX_BOUND) {
435 error = -EBUSY;
436 goto out;
437 }
438
439 if (add_chan(po, &sp->sa_addr.pptp))
440 error = -EBUSY;
441 else
442 sk->sk_state |= PPPOX_BOUND;
443
444 out:
445 release_sock(sk);
446 return error;
447 }
448
449 static int pptp_connect(struct socket *sock, struct sockaddr *uservaddr,
450 int sockaddr_len, int flags)
451 {
452 struct sock *sk = sock->sk;
453 struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr;
454 struct pppox_sock *po = pppox_sk(sk);
455 struct pptp_opt *opt = &po->proto.pptp;
456 struct rtable *rt;
457 struct flowi4 fl4;
458 int error = 0;
459
460 if (sockaddr_len < sizeof(struct sockaddr_pppox))
461 return -EINVAL;
462
463 if (sp->sa_protocol != PX_PROTO_PPTP)
464 return -EINVAL;
465
466 if (lookup_chan_dst(sp->sa_addr.pptp.call_id, sp->sa_addr.pptp.sin_addr.s_addr))
467 return -EALREADY;
468
469 lock_sock(sk);
470 /* Check for already bound sockets */
471 if (sk->sk_state & PPPOX_CONNECTED) {
472 error = -EBUSY;
473 goto end;
474 }
475
476 /* Check for already disconnected sockets, on attempts to disconnect */
477 if (sk->sk_state & PPPOX_DEAD) {
478 error = -EALREADY;
479 goto end;
480 }
481
482 if (!opt->src_addr.sin_addr.s_addr || !sp->sa_addr.pptp.sin_addr.s_addr) {
483 error = -EINVAL;
484 goto end;
485 }
486
487 po->chan.private = sk;
488 po->chan.ops = &pptp_chan_ops;
489
490 rt = ip_route_output_ports(sock_net(sk), &fl4, sk,
491 opt->dst_addr.sin_addr.s_addr,
492 opt->src_addr.sin_addr.s_addr,
493 0, 0,
494 IPPROTO_GRE, RT_CONN_FLAGS(sk), 0);
495 if (IS_ERR(rt)) {
496 error = -EHOSTUNREACH;
497 goto end;
498 }
499 sk_setup_caps(sk, &rt->dst);
500
501 po->chan.mtu = dst_mtu(&rt->dst);
502 if (!po->chan.mtu)
503 po->chan.mtu = PPP_MRU;
504 ip_rt_put(rt);
505 po->chan.mtu -= PPTP_HEADER_OVERHEAD;
506
507 po->chan.hdrlen = 2 + sizeof(struct pptp_gre_header);
508 error = ppp_register_channel(&po->chan);
509 if (error) {
510 pr_err("PPTP: failed to register PPP channel (%d)\n", error);
511 goto end;
512 }
513
514 opt->dst_addr = sp->sa_addr.pptp;
515 sk->sk_state |= PPPOX_CONNECTED;
516
517 end:
518 release_sock(sk);
519 return error;
520 }
521
522 static int pptp_getname(struct socket *sock, struct sockaddr *uaddr,
523 int *usockaddr_len, int peer)
524 {
525 int len = sizeof(struct sockaddr_pppox);
526 struct sockaddr_pppox sp;
527
528 memset(&sp.sa_addr, 0, sizeof(sp.sa_addr));
529
530 sp.sa_family = AF_PPPOX;
531 sp.sa_protocol = PX_PROTO_PPTP;
532 sp.sa_addr.pptp = pppox_sk(sock->sk)->proto.pptp.src_addr;
533
534 memcpy(uaddr, &sp, len);
535
536 *usockaddr_len = len;
537
538 return 0;
539 }
540
541 static int pptp_release(struct socket *sock)
542 {
543 struct sock *sk = sock->sk;
544 struct pppox_sock *po;
545 struct pptp_opt *opt;
546 int error = 0;
547
548 if (!sk)
549 return 0;
550
551 lock_sock(sk);
552
553 if (sock_flag(sk, SOCK_DEAD)) {
554 release_sock(sk);
555 return -EBADF;
556 }
557
558 po = pppox_sk(sk);
559 opt = &po->proto.pptp;
560 del_chan(po);
561
562 pppox_unbind_sock(sk);
563 sk->sk_state = PPPOX_DEAD;
564
565 sock_orphan(sk);
566 sock->sk = NULL;
567
568 release_sock(sk);
569 sock_put(sk);
570
571 return error;
572 }
573
574 static void pptp_sock_destruct(struct sock *sk)
575 {
576 if (!(sk->sk_state & PPPOX_DEAD)) {
577 del_chan(pppox_sk(sk));
578 pppox_unbind_sock(sk);
579 }
580 skb_queue_purge(&sk->sk_receive_queue);
581 }
582
583 static int pptp_create(struct net *net, struct socket *sock, int kern)
584 {
585 int error = -ENOMEM;
586 struct sock *sk;
587 struct pppox_sock *po;
588 struct pptp_opt *opt;
589
590 sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pptp_sk_proto, kern);
591 if (!sk)
592 goto out;
593
594 sock_init_data(sock, sk);
595
596 sock->state = SS_UNCONNECTED;
597 sock->ops = &pptp_ops;
598
599 sk->sk_backlog_rcv = pptp_rcv_core;
600 sk->sk_state = PPPOX_NONE;
601 sk->sk_type = SOCK_STREAM;
602 sk->sk_family = PF_PPPOX;
603 sk->sk_protocol = PX_PROTO_PPTP;
604 sk->sk_destruct = pptp_sock_destruct;
605
606 po = pppox_sk(sk);
607 opt = &po->proto.pptp;
608
609 opt->seq_sent = 0; opt->seq_recv = 0xffffffff;
610 opt->ack_recv = 0; opt->ack_sent = 0xffffffff;
611
612 error = 0;
613 out:
614 return error;
615 }
616
617 static int pptp_ppp_ioctl(struct ppp_channel *chan, unsigned int cmd,
618 unsigned long arg)
619 {
620 struct sock *sk = (struct sock *) chan->private;
621 struct pppox_sock *po = pppox_sk(sk);
622 struct pptp_opt *opt = &po->proto.pptp;
623 void __user *argp = (void __user *)arg;
624 int __user *p = argp;
625 int err, val;
626
627 err = -EFAULT;
628 switch (cmd) {
629 case PPPIOCGFLAGS:
630 val = opt->ppp_flags;
631 if (put_user(val, p))
632 break;
633 err = 0;
634 break;
635 case PPPIOCSFLAGS:
636 if (get_user(val, p))
637 break;
638 opt->ppp_flags = val & ~SC_RCV_BITS;
639 err = 0;
640 break;
641 default:
642 err = -ENOTTY;
643 }
644
645 return err;
646 }
647
648 static const struct ppp_channel_ops pptp_chan_ops = {
649 .start_xmit = pptp_xmit,
650 .ioctl = pptp_ppp_ioctl,
651 };
652
653 static struct proto pptp_sk_proto __read_mostly = {
654 .name = "PPTP",
655 .owner = THIS_MODULE,
656 .obj_size = sizeof(struct pppox_sock),
657 };
658
659 static const struct proto_ops pptp_ops = {
660 .family = AF_PPPOX,
661 .owner = THIS_MODULE,
662 .release = pptp_release,
663 .bind = pptp_bind,
664 .connect = pptp_connect,
665 .socketpair = sock_no_socketpair,
666 .accept = sock_no_accept,
667 .getname = pptp_getname,
668 .poll = sock_no_poll,
669 .listen = sock_no_listen,
670 .shutdown = sock_no_shutdown,
671 .setsockopt = sock_no_setsockopt,
672 .getsockopt = sock_no_getsockopt,
673 .sendmsg = sock_no_sendmsg,
674 .recvmsg = sock_no_recvmsg,
675 .mmap = sock_no_mmap,
676 .ioctl = pppox_ioctl,
677 };
678
679 static const struct pppox_proto pppox_pptp_proto = {
680 .create = pptp_create,
681 .owner = THIS_MODULE,
682 };
683
684 static const struct gre_protocol gre_pptp_protocol = {
685 .handler = pptp_rcv,
686 };
687
688 static int __init pptp_init_module(void)
689 {
690 int err = 0;
691 pr_info("PPTP driver version " PPTP_DRIVER_VERSION "\n");
692
693 callid_sock = vzalloc((MAX_CALLID + 1) * sizeof(void *));
694 if (!callid_sock)
695 return -ENOMEM;
696
697 err = gre_add_protocol(&gre_pptp_protocol, GREPROTO_PPTP);
698 if (err) {
699 pr_err("PPTP: can't add gre protocol\n");
700 goto out_mem_free;
701 }
702
703 err = proto_register(&pptp_sk_proto, 0);
704 if (err) {
705 pr_err("PPTP: can't register sk_proto\n");
706 goto out_gre_del_protocol;
707 }
708
709 err = register_pppox_proto(PX_PROTO_PPTP, &pppox_pptp_proto);
710 if (err) {
711 pr_err("PPTP: can't register pppox_proto\n");
712 goto out_unregister_sk_proto;
713 }
714
715 return 0;
716
717 out_unregister_sk_proto:
718 proto_unregister(&pptp_sk_proto);
719 out_gre_del_protocol:
720 gre_del_protocol(&gre_pptp_protocol, GREPROTO_PPTP);
721 out_mem_free:
722 vfree(callid_sock);
723
724 return err;
725 }
726
727 static void __exit pptp_exit_module(void)
728 {
729 unregister_pppox_proto(PX_PROTO_PPTP);
730 proto_unregister(&pptp_sk_proto);
731 gre_del_protocol(&gre_pptp_protocol, GREPROTO_PPTP);
732 vfree(callid_sock);
733 }
734
735 module_init(pptp_init_module);
736 module_exit(pptp_exit_module);
737
738 MODULE_DESCRIPTION("Point-to-Point Tunneling Protocol");
739 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
740 MODULE_LICENSE("GPL");
741 MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_PPTP);
Linux with added FPC-III support