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00959ade DK |
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> | |
bf7daebb | 26 | #include <linux/ppp-ioctl.h> |
00959ade DK |
27 | #include <linux/notifier.h> |
28 | #include <linux/file.h> | |
29 | #include <linux/in.h> | |
30 | #include <linux/ip.h> | |
00959ade DK |
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> | |
ab10dccb | 40 | #include <net/pptp.h> |
00959ade DK |
41 | |
42 | #include <linux/uaccess.h> | |
43 | ||
44 | #define PPTP_DRIVER_VERSION "0.8.5" | |
45 | ||
46 | #define MAX_CALLID 65535 | |
47 | ||
48 | static DECLARE_BITMAP(callid_bitmap, MAX_CALLID + 1); | |
469230d1 | 49 | static struct pppox_sock __rcu **callid_sock; |
00959ade DK |
50 | |
51 | static DEFINE_SPINLOCK(chan_lock); | |
52 | ||
53 | static struct proto pptp_sk_proto __read_mostly; | |
756e64a0 | 54 | static const struct ppp_channel_ops pptp_chan_ops; |
00959ade DK |
55 | static const struct proto_ops pptp_ops; |
56 | ||
00959ade DK |
57 | static struct pppox_sock *lookup_chan(u16 call_id, __be32 s_addr) |
58 | { | |
59 | struct pppox_sock *sock; | |
60 | struct pptp_opt *opt; | |
61 | ||
62 | rcu_read_lock(); | |
63 | sock = rcu_dereference(callid_sock[call_id]); | |
64 | if (sock) { | |
65 | opt = &sock->proto.pptp; | |
66 | if (opt->dst_addr.sin_addr.s_addr != s_addr) | |
67 | sock = NULL; | |
68 | else | |
69 | sock_hold(sk_pppox(sock)); | |
70 | } | |
71 | rcu_read_unlock(); | |
72 | ||
73 | return sock; | |
74 | } | |
75 | ||
76 | static int lookup_chan_dst(u16 call_id, __be32 d_addr) | |
77 | { | |
78 | struct pppox_sock *sock; | |
79 | struct pptp_opt *opt; | |
80 | int i; | |
81 | ||
82 | rcu_read_lock(); | |
99427747 AM |
83 | i = 1; |
84 | for_each_set_bit_from(i, callid_bitmap, MAX_CALLID) { | |
00959ade DK |
85 | sock = rcu_dereference(callid_sock[i]); |
86 | if (!sock) | |
87 | continue; | |
88 | opt = &sock->proto.pptp; | |
89 | if (opt->dst_addr.call_id == call_id && | |
90 | opt->dst_addr.sin_addr.s_addr == d_addr) | |
91 | break; | |
92 | } | |
93 | rcu_read_unlock(); | |
94 | ||
95 | return i < MAX_CALLID; | |
96 | } | |
97 | ||
9a368aff HFS |
98 | static int add_chan(struct pppox_sock *sock, |
99 | struct pptp_addr *sa) | |
00959ade DK |
100 | { |
101 | static int call_id; | |
102 | ||
103 | spin_lock(&chan_lock); | |
9a368aff | 104 | if (!sa->call_id) { |
00959ade DK |
105 | call_id = find_next_zero_bit(callid_bitmap, MAX_CALLID, call_id + 1); |
106 | if (call_id == MAX_CALLID) { | |
107 | call_id = find_next_zero_bit(callid_bitmap, MAX_CALLID, 1); | |
108 | if (call_id == MAX_CALLID) | |
109 | goto out_err; | |
110 | } | |
9a368aff HFS |
111 | sa->call_id = call_id; |
112 | } else if (test_bit(sa->call_id, callid_bitmap)) { | |
00959ade | 113 | goto out_err; |
9a368aff | 114 | } |
00959ade | 115 | |
9a368aff HFS |
116 | sock->proto.pptp.src_addr = *sa; |
117 | set_bit(sa->call_id, callid_bitmap); | |
118 | rcu_assign_pointer(callid_sock[sa->call_id], sock); | |
00959ade DK |
119 | spin_unlock(&chan_lock); |
120 | ||
121 | return 0; | |
122 | ||
123 | out_err: | |
124 | spin_unlock(&chan_lock); | |
125 | return -1; | |
126 | } | |
127 | ||
128 | static void del_chan(struct pppox_sock *sock) | |
129 | { | |
130 | spin_lock(&chan_lock); | |
131 | clear_bit(sock->proto.pptp.src_addr.call_id, callid_bitmap); | |
2cfa5a04 | 132 | RCU_INIT_POINTER(callid_sock[sock->proto.pptp.src_addr.call_id], NULL); |
00959ade | 133 | spin_unlock(&chan_lock); |
00959ade DK |
134 | } |
135 | ||
136 | static int pptp_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
137 | { | |
138 | struct sock *sk = (struct sock *) chan->private; | |
139 | struct pppox_sock *po = pppox_sk(sk); | |
a7093fef | 140 | struct net *net = sock_net(sk); |
00959ade DK |
141 | struct pptp_opt *opt = &po->proto.pptp; |
142 | struct pptp_gre_header *hdr; | |
143 | unsigned int header_len = sizeof(*hdr); | |
31e4543d | 144 | struct flowi4 fl4; |
00959ade DK |
145 | int islcp; |
146 | int len; | |
147 | unsigned char *data; | |
148 | __u32 seq_recv; | |
149 | ||
150 | ||
151 | struct rtable *rt; | |
152 | struct net_device *tdev; | |
153 | struct iphdr *iph; | |
154 | int max_headroom; | |
155 | ||
156 | if (sk_pppox(po)->sk_state & PPPOX_DEAD) | |
157 | goto tx_error; | |
158 | ||
a7093fef | 159 | rt = ip_route_output_ports(net, &fl4, NULL, |
78fbfd8a DM |
160 | opt->dst_addr.sin_addr.s_addr, |
161 | opt->src_addr.sin_addr.s_addr, | |
162 | 0, 0, IPPROTO_GRE, | |
163 | RT_TOS(0), 0); | |
164 | if (IS_ERR(rt)) | |
165 | goto tx_error; | |
166 | ||
00959ade DK |
167 | tdev = rt->dst.dev; |
168 | ||
169 | max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(*iph) + sizeof(*hdr) + 2; | |
170 | ||
171 | if (skb_headroom(skb) < max_headroom || skb_cloned(skb) || skb_shared(skb)) { | |
172 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); | |
173 | if (!new_skb) { | |
174 | ip_rt_put(rt); | |
175 | goto tx_error; | |
176 | } | |
177 | if (skb->sk) | |
178 | skb_set_owner_w(new_skb, skb->sk); | |
968d7018 | 179 | consume_skb(skb); |
00959ade DK |
180 | skb = new_skb; |
181 | } | |
182 | ||
183 | data = skb->data; | |
184 | islcp = ((data[0] << 8) + data[1]) == PPP_LCP && 1 <= data[2] && data[2] <= 7; | |
185 | ||
186 | /* compress protocol field */ | |
187 | if ((opt->ppp_flags & SC_COMP_PROT) && data[0] == 0 && !islcp) | |
188 | skb_pull(skb, 1); | |
189 | ||
190 | /* Put in the address/control bytes if necessary */ | |
191 | if ((opt->ppp_flags & SC_COMP_AC) == 0 || islcp) { | |
192 | data = skb_push(skb, 2); | |
193 | data[0] = PPP_ALLSTATIONS; | |
194 | data[1] = PPP_UI; | |
195 | } | |
196 | ||
197 | len = skb->len; | |
198 | ||
199 | seq_recv = opt->seq_recv; | |
200 | ||
201 | if (opt->ack_sent == seq_recv) | |
202 | header_len -= sizeof(hdr->ack); | |
203 | ||
204 | /* Push down and install GRE header */ | |
205 | skb_push(skb, header_len); | |
206 | hdr = (struct pptp_gre_header *)(skb->data); | |
207 | ||
03459345 GF |
208 | hdr->gre_hd.flags = GRE_KEY | GRE_VERSION_1 | GRE_SEQ; |
209 | hdr->gre_hd.protocol = GRE_PROTO_PPP; | |
210 | hdr->call_id = htons(opt->dst_addr.call_id); | |
00959ade | 211 | |
03459345 | 212 | hdr->seq = htonl(++opt->seq_sent); |
00959ade DK |
213 | if (opt->ack_sent != seq_recv) { |
214 | /* send ack with this message */ | |
03459345 | 215 | hdr->gre_hd.flags |= GRE_ACK; |
00959ade DK |
216 | hdr->ack = htonl(seq_recv); |
217 | opt->ack_sent = seq_recv; | |
218 | } | |
219 | hdr->payload_len = htons(len); | |
220 | ||
221 | /* Push down and install the IP header. */ | |
222 | ||
223 | skb_reset_transport_header(skb); | |
224 | skb_push(skb, sizeof(*iph)); | |
225 | skb_reset_network_header(skb); | |
226 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
227 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | IPSKB_REROUTED); | |
228 | ||
229 | iph = ip_hdr(skb); | |
230 | iph->version = 4; | |
231 | iph->ihl = sizeof(struct iphdr) >> 2; | |
232 | if (ip_dont_fragment(sk, &rt->dst)) | |
233 | iph->frag_off = htons(IP_DF); | |
234 | else | |
235 | iph->frag_off = 0; | |
236 | iph->protocol = IPPROTO_GRE; | |
237 | iph->tos = 0; | |
28c90da0 DM |
238 | iph->daddr = fl4.daddr; |
239 | iph->saddr = fl4.saddr; | |
323e126f | 240 | iph->ttl = ip4_dst_hoplimit(&rt->dst); |
00959ade DK |
241 | iph->tot_len = htons(skb->len); |
242 | ||
243 | skb_dst_drop(skb); | |
244 | skb_dst_set(skb, &rt->dst); | |
245 | ||
246 | nf_reset(skb); | |
247 | ||
248 | skb->ip_summed = CHECKSUM_NONE; | |
a7093fef | 249 | ip_select_ident(net, skb, NULL); |
00959ade DK |
250 | ip_send_check(iph); |
251 | ||
33224b16 | 252 | ip_local_out(net, skb->sk, skb); |
8bae8bd6 | 253 | return 1; |
00959ade DK |
254 | |
255 | tx_error: | |
8bae8bd6 | 256 | kfree_skb(skb); |
00959ade DK |
257 | return 1; |
258 | } | |
259 | ||
260 | static int pptp_rcv_core(struct sock *sk, struct sk_buff *skb) | |
261 | { | |
262 | struct pppox_sock *po = pppox_sk(sk); | |
263 | struct pptp_opt *opt = &po->proto.pptp; | |
264 | int headersize, payload_len, seq; | |
265 | __u8 *payload; | |
266 | struct pptp_gre_header *header; | |
267 | ||
268 | if (!(sk->sk_state & PPPOX_CONNECTED)) { | |
269 | if (sock_queue_rcv_skb(sk, skb)) | |
270 | goto drop; | |
271 | return NET_RX_SUCCESS; | |
272 | } | |
273 | ||
274 | header = (struct pptp_gre_header *)(skb->data); | |
4ea2739e | 275 | headersize = sizeof(*header); |
00959ade DK |
276 | |
277 | /* test if acknowledgement present */ | |
03459345 | 278 | if (GRE_IS_ACK(header->gre_hd.flags)) { |
4ea2739e ED |
279 | __u32 ack; |
280 | ||
281 | if (!pskb_may_pull(skb, headersize)) | |
282 | goto drop; | |
283 | header = (struct pptp_gre_header *)(skb->data); | |
284 | ||
285 | /* ack in different place if S = 0 */ | |
03459345 | 286 | ack = GRE_IS_SEQ(header->gre_hd.flags) ? header->ack : header->seq; |
00959ade DK |
287 | |
288 | ack = ntohl(ack); | |
289 | ||
290 | if (ack > opt->ack_recv) | |
291 | opt->ack_recv = ack; | |
292 | /* also handle sequence number wrap-around */ | |
293 | if (WRAPPED(ack, opt->ack_recv)) | |
294 | opt->ack_recv = ack; | |
4ea2739e ED |
295 | } else { |
296 | headersize -= sizeof(header->ack); | |
00959ade | 297 | } |
00959ade | 298 | /* test if payload present */ |
03459345 | 299 | if (!GRE_IS_SEQ(header->gre_hd.flags)) |
00959ade DK |
300 | goto drop; |
301 | ||
00959ade DK |
302 | payload_len = ntohs(header->payload_len); |
303 | seq = ntohl(header->seq); | |
304 | ||
00959ade | 305 | /* check for incomplete packet (length smaller than expected) */ |
4ea2739e | 306 | if (!pskb_may_pull(skb, headersize + payload_len)) |
00959ade DK |
307 | goto drop; |
308 | ||
309 | payload = skb->data + headersize; | |
310 | /* check for expected sequence number */ | |
311 | if (seq < opt->seq_recv + 1 || WRAPPED(opt->seq_recv, seq)) { | |
312 | if ((payload[0] == PPP_ALLSTATIONS) && (payload[1] == PPP_UI) && | |
313 | (PPP_PROTOCOL(payload) == PPP_LCP) && | |
314 | ((payload[4] == PPP_LCP_ECHOREQ) || (payload[4] == PPP_LCP_ECHOREP))) | |
315 | goto allow_packet; | |
316 | } else { | |
317 | opt->seq_recv = seq; | |
318 | allow_packet: | |
319 | skb_pull(skb, headersize); | |
320 | ||
321 | if (payload[0] == PPP_ALLSTATIONS && payload[1] == PPP_UI) { | |
322 | /* chop off address/control */ | |
323 | if (skb->len < 3) | |
324 | goto drop; | |
325 | skb_pull(skb, 2); | |
326 | } | |
327 | ||
328 | if ((*skb->data) & 1) { | |
329 | /* protocol is compressed */ | |
d58ff351 | 330 | *(u8 *)skb_push(skb, 1) = 0; |
00959ade DK |
331 | } |
332 | ||
333 | skb->ip_summed = CHECKSUM_NONE; | |
334 | skb_set_network_header(skb, skb->head-skb->data); | |
335 | ppp_input(&po->chan, skb); | |
336 | ||
337 | return NET_RX_SUCCESS; | |
338 | } | |
339 | drop: | |
340 | kfree_skb(skb); | |
341 | return NET_RX_DROP; | |
342 | } | |
343 | ||
344 | static int pptp_rcv(struct sk_buff *skb) | |
345 | { | |
346 | struct pppox_sock *po; | |
347 | struct pptp_gre_header *header; | |
348 | struct iphdr *iph; | |
349 | ||
350 | if (skb->pkt_type != PACKET_HOST) | |
351 | goto drop; | |
352 | ||
353 | if (!pskb_may_pull(skb, 12)) | |
354 | goto drop; | |
355 | ||
356 | iph = ip_hdr(skb); | |
357 | ||
358 | header = (struct pptp_gre_header *)skb->data; | |
359 | ||
03459345 GF |
360 | if (header->gre_hd.protocol != GRE_PROTO_PPP || /* PPTP-GRE protocol for PPTP */ |
361 | GRE_IS_CSUM(header->gre_hd.flags) || /* flag CSUM should be clear */ | |
362 | GRE_IS_ROUTING(header->gre_hd.flags) || /* flag ROUTING should be clear */ | |
363 | !GRE_IS_KEY(header->gre_hd.flags) || /* flag KEY should be set */ | |
364 | (header->gre_hd.flags & GRE_FLAGS)) /* flag Recursion Ctrl should be clear */ | |
00959ade DK |
365 | /* if invalid, discard this packet */ |
366 | goto drop; | |
367 | ||
368 | po = lookup_chan(htons(header->call_id), iph->saddr); | |
369 | if (po) { | |
370 | skb_dst_drop(skb); | |
371 | nf_reset(skb); | |
372 | return sk_receive_skb(sk_pppox(po), skb, 0); | |
373 | } | |
374 | drop: | |
375 | kfree_skb(skb); | |
376 | return NET_RX_DROP; | |
377 | } | |
378 | ||
379 | static int pptp_bind(struct socket *sock, struct sockaddr *uservaddr, | |
380 | int sockaddr_len) | |
381 | { | |
382 | struct sock *sk = sock->sk; | |
383 | struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr; | |
384 | struct pppox_sock *po = pppox_sk(sk); | |
00959ade DK |
385 | int error = 0; |
386 | ||
09ccfd23 WC |
387 | if (sockaddr_len < sizeof(struct sockaddr_pppox)) |
388 | return -EINVAL; | |
389 | ||
00959ade DK |
390 | lock_sock(sk); |
391 | ||
9a368aff HFS |
392 | if (sk->sk_state & PPPOX_DEAD) { |
393 | error = -EALREADY; | |
394 | goto out; | |
395 | } | |
396 | ||
397 | if (sk->sk_state & PPPOX_BOUND) { | |
00959ade | 398 | error = -EBUSY; |
9a368aff HFS |
399 | goto out; |
400 | } | |
401 | ||
402 | if (add_chan(po, &sp->sa_addr.pptp)) | |
403 | error = -EBUSY; | |
404 | else | |
405 | sk->sk_state |= PPPOX_BOUND; | |
00959ade | 406 | |
9a368aff | 407 | out: |
00959ade DK |
408 | release_sock(sk); |
409 | return error; | |
410 | } | |
411 | ||
412 | static int pptp_connect(struct socket *sock, struct sockaddr *uservaddr, | |
413 | int sockaddr_len, int flags) | |
414 | { | |
415 | struct sock *sk = sock->sk; | |
416 | struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr; | |
417 | struct pppox_sock *po = pppox_sk(sk); | |
418 | struct pptp_opt *opt = &po->proto.pptp; | |
419 | struct rtable *rt; | |
31e4543d | 420 | struct flowi4 fl4; |
00959ade DK |
421 | int error = 0; |
422 | ||
09ccfd23 WC |
423 | if (sockaddr_len < sizeof(struct sockaddr_pppox)) |
424 | return -EINVAL; | |
425 | ||
00959ade DK |
426 | if (sp->sa_protocol != PX_PROTO_PPTP) |
427 | return -EINVAL; | |
428 | ||
429 | if (lookup_chan_dst(sp->sa_addr.pptp.call_id, sp->sa_addr.pptp.sin_addr.s_addr)) | |
430 | return -EALREADY; | |
431 | ||
432 | lock_sock(sk); | |
433 | /* Check for already bound sockets */ | |
434 | if (sk->sk_state & PPPOX_CONNECTED) { | |
435 | error = -EBUSY; | |
436 | goto end; | |
437 | } | |
438 | ||
439 | /* Check for already disconnected sockets, on attempts to disconnect */ | |
440 | if (sk->sk_state & PPPOX_DEAD) { | |
441 | error = -EALREADY; | |
442 | goto end; | |
443 | } | |
444 | ||
445 | if (!opt->src_addr.sin_addr.s_addr || !sp->sa_addr.pptp.sin_addr.s_addr) { | |
446 | error = -EINVAL; | |
447 | goto end; | |
448 | } | |
449 | ||
450 | po->chan.private = sk; | |
451 | po->chan.ops = &pptp_chan_ops; | |
452 | ||
08252b32 | 453 | rt = ip_route_output_ports(sock_net(sk), &fl4, sk, |
78fbfd8a DM |
454 | opt->dst_addr.sin_addr.s_addr, |
455 | opt->src_addr.sin_addr.s_addr, | |
456 | 0, 0, | |
457 | IPPROTO_GRE, RT_CONN_FLAGS(sk), 0); | |
458 | if (IS_ERR(rt)) { | |
459 | error = -EHOSTUNREACH; | |
460 | goto end; | |
00959ade | 461 | } |
78fbfd8a DM |
462 | sk_setup_caps(sk, &rt->dst); |
463 | ||
00959ade DK |
464 | po->chan.mtu = dst_mtu(&rt->dst); |
465 | if (!po->chan.mtu) | |
bf7daebb | 466 | po->chan.mtu = PPP_MRU; |
00959ade DK |
467 | ip_rt_put(rt); |
468 | po->chan.mtu -= PPTP_HEADER_OVERHEAD; | |
469 | ||
470 | po->chan.hdrlen = 2 + sizeof(struct pptp_gre_header); | |
471 | error = ppp_register_channel(&po->chan); | |
472 | if (error) { | |
473 | pr_err("PPTP: failed to register PPP channel (%d)\n", error); | |
474 | goto end; | |
475 | } | |
476 | ||
477 | opt->dst_addr = sp->sa_addr.pptp; | |
9a368aff | 478 | sk->sk_state |= PPPOX_CONNECTED; |
00959ade DK |
479 | |
480 | end: | |
481 | release_sock(sk); | |
482 | return error; | |
483 | } | |
484 | ||
485 | static int pptp_getname(struct socket *sock, struct sockaddr *uaddr, | |
486 | int *usockaddr_len, int peer) | |
487 | { | |
488 | int len = sizeof(struct sockaddr_pppox); | |
489 | struct sockaddr_pppox sp; | |
490 | ||
a5f6fc28 MK |
491 | memset(&sp.sa_addr, 0, sizeof(sp.sa_addr)); |
492 | ||
493 | sp.sa_family = AF_PPPOX; | |
00959ade DK |
494 | sp.sa_protocol = PX_PROTO_PPTP; |
495 | sp.sa_addr.pptp = pppox_sk(sock->sk)->proto.pptp.src_addr; | |
496 | ||
497 | memcpy(uaddr, &sp, len); | |
498 | ||
499 | *usockaddr_len = len; | |
500 | ||
501 | return 0; | |
502 | } | |
503 | ||
504 | static int pptp_release(struct socket *sock) | |
505 | { | |
506 | struct sock *sk = sock->sk; | |
507 | struct pppox_sock *po; | |
00959ade DK |
508 | int error = 0; |
509 | ||
510 | if (!sk) | |
511 | return 0; | |
512 | ||
513 | lock_sock(sk); | |
514 | ||
515 | if (sock_flag(sk, SOCK_DEAD)) { | |
516 | release_sock(sk); | |
517 | return -EBADF; | |
518 | } | |
519 | ||
520 | po = pppox_sk(sk); | |
00959ade | 521 | del_chan(po); |
ddab8282 | 522 | synchronize_rcu(); |
00959ade DK |
523 | |
524 | pppox_unbind_sock(sk); | |
525 | sk->sk_state = PPPOX_DEAD; | |
526 | ||
527 | sock_orphan(sk); | |
528 | sock->sk = NULL; | |
529 | ||
530 | release_sock(sk); | |
531 | sock_put(sk); | |
532 | ||
533 | return error; | |
534 | } | |
535 | ||
536 | static void pptp_sock_destruct(struct sock *sk) | |
537 | { | |
538 | if (!(sk->sk_state & PPPOX_DEAD)) { | |
539 | del_chan(pppox_sk(sk)); | |
540 | pppox_unbind_sock(sk); | |
541 | } | |
542 | skb_queue_purge(&sk->sk_receive_queue); | |
543 | } | |
544 | ||
11aa9c28 | 545 | static int pptp_create(struct net *net, struct socket *sock, int kern) |
00959ade DK |
546 | { |
547 | int error = -ENOMEM; | |
548 | struct sock *sk; | |
549 | struct pppox_sock *po; | |
550 | struct pptp_opt *opt; | |
551 | ||
11aa9c28 | 552 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pptp_sk_proto, kern); |
00959ade DK |
553 | if (!sk) |
554 | goto out; | |
555 | ||
556 | sock_init_data(sock, sk); | |
557 | ||
558 | sock->state = SS_UNCONNECTED; | |
559 | sock->ops = &pptp_ops; | |
560 | ||
561 | sk->sk_backlog_rcv = pptp_rcv_core; | |
562 | sk->sk_state = PPPOX_NONE; | |
563 | sk->sk_type = SOCK_STREAM; | |
564 | sk->sk_family = PF_PPPOX; | |
565 | sk->sk_protocol = PX_PROTO_PPTP; | |
566 | sk->sk_destruct = pptp_sock_destruct; | |
567 | ||
568 | po = pppox_sk(sk); | |
569 | opt = &po->proto.pptp; | |
570 | ||
91dce7dd BP |
571 | opt->seq_sent = 0; opt->seq_recv = 0xffffffff; |
572 | opt->ack_recv = 0; opt->ack_sent = 0xffffffff; | |
00959ade DK |
573 | |
574 | error = 0; | |
575 | out: | |
576 | return error; | |
577 | } | |
578 | ||
579 | static int pptp_ppp_ioctl(struct ppp_channel *chan, unsigned int cmd, | |
580 | unsigned long arg) | |
581 | { | |
582 | struct sock *sk = (struct sock *) chan->private; | |
583 | struct pppox_sock *po = pppox_sk(sk); | |
584 | struct pptp_opt *opt = &po->proto.pptp; | |
585 | void __user *argp = (void __user *)arg; | |
586 | int __user *p = argp; | |
587 | int err, val; | |
588 | ||
589 | err = -EFAULT; | |
590 | switch (cmd) { | |
591 | case PPPIOCGFLAGS: | |
592 | val = opt->ppp_flags; | |
593 | if (put_user(val, p)) | |
594 | break; | |
595 | err = 0; | |
596 | break; | |
597 | case PPPIOCSFLAGS: | |
598 | if (get_user(val, p)) | |
599 | break; | |
600 | opt->ppp_flags = val & ~SC_RCV_BITS; | |
601 | err = 0; | |
602 | break; | |
603 | default: | |
604 | err = -ENOTTY; | |
605 | } | |
606 | ||
607 | return err; | |
608 | } | |
609 | ||
756e64a0 | 610 | static const struct ppp_channel_ops pptp_chan_ops = { |
00959ade DK |
611 | .start_xmit = pptp_xmit, |
612 | .ioctl = pptp_ppp_ioctl, | |
613 | }; | |
614 | ||
615 | static struct proto pptp_sk_proto __read_mostly = { | |
616 | .name = "PPTP", | |
617 | .owner = THIS_MODULE, | |
618 | .obj_size = sizeof(struct pppox_sock), | |
619 | }; | |
620 | ||
621 | static const struct proto_ops pptp_ops = { | |
622 | .family = AF_PPPOX, | |
623 | .owner = THIS_MODULE, | |
624 | .release = pptp_release, | |
625 | .bind = pptp_bind, | |
626 | .connect = pptp_connect, | |
627 | .socketpair = sock_no_socketpair, | |
628 | .accept = sock_no_accept, | |
629 | .getname = pptp_getname, | |
630 | .poll = sock_no_poll, | |
631 | .listen = sock_no_listen, | |
632 | .shutdown = sock_no_shutdown, | |
633 | .setsockopt = sock_no_setsockopt, | |
634 | .getsockopt = sock_no_getsockopt, | |
635 | .sendmsg = sock_no_sendmsg, | |
636 | .recvmsg = sock_no_recvmsg, | |
637 | .mmap = sock_no_mmap, | |
638 | .ioctl = pppox_ioctl, | |
639 | }; | |
640 | ||
756e64a0 | 641 | static const struct pppox_proto pppox_pptp_proto = { |
00959ade DK |
642 | .create = pptp_create, |
643 | .owner = THIS_MODULE, | |
644 | }; | |
645 | ||
756e64a0 | 646 | static const struct gre_protocol gre_pptp_protocol = { |
00959ade DK |
647 | .handler = pptp_rcv, |
648 | }; | |
649 | ||
650 | static int __init pptp_init_module(void) | |
651 | { | |
652 | int err = 0; | |
653 | pr_info("PPTP driver version " PPTP_DRIVER_VERSION "\n"); | |
654 | ||
89bf67f1 | 655 | callid_sock = vzalloc((MAX_CALLID + 1) * sizeof(void *)); |
e404decb | 656 | if (!callid_sock) |
00959ade | 657 | return -ENOMEM; |
00959ade DK |
658 | |
659 | err = gre_add_protocol(&gre_pptp_protocol, GREPROTO_PPTP); | |
660 | if (err) { | |
661 | pr_err("PPTP: can't add gre protocol\n"); | |
662 | goto out_mem_free; | |
663 | } | |
664 | ||
665 | err = proto_register(&pptp_sk_proto, 0); | |
666 | if (err) { | |
667 | pr_err("PPTP: can't register sk_proto\n"); | |
668 | goto out_gre_del_protocol; | |
669 | } | |
670 | ||
671 | err = register_pppox_proto(PX_PROTO_PPTP, &pppox_pptp_proto); | |
672 | if (err) { | |
673 | pr_err("PPTP: can't register pppox_proto\n"); | |
674 | goto out_unregister_sk_proto; | |
675 | } | |
676 | ||
677 | return 0; | |
678 | ||
679 | out_unregister_sk_proto: | |
680 | proto_unregister(&pptp_sk_proto); | |
681 | out_gre_del_protocol: | |
682 | gre_del_protocol(&gre_pptp_protocol, GREPROTO_PPTP); | |
683 | out_mem_free: | |
684 | vfree(callid_sock); | |
685 | ||
686 | return err; | |
687 | } | |
688 | ||
689 | static void __exit pptp_exit_module(void) | |
690 | { | |
691 | unregister_pppox_proto(PX_PROTO_PPTP); | |
692 | proto_unregister(&pptp_sk_proto); | |
693 | gre_del_protocol(&gre_pptp_protocol, GREPROTO_PPTP); | |
694 | vfree(callid_sock); | |
695 | } | |
696 | ||
697 | module_init(pptp_init_module); | |
698 | module_exit(pptp_exit_module); | |
699 | ||
700 | MODULE_DESCRIPTION("Point-to-Point Tunneling Protocol"); | |
701 | MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); | |
702 | MODULE_LICENSE("GPL"); | |
681b4d88 | 703 | MODULE_ALIAS_NET_PF_PROTO(PF_PPPOX, PX_PROTO_PPTP); |