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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> | |
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); | |
469230d1 | 48 | static struct pppox_sock __rcu **callid_sock; |
00959ade DK |
49 | |
50 | static DEFINE_SPINLOCK(chan_lock); | |
51 | ||
52 | static struct proto pptp_sk_proto __read_mostly; | |
756e64a0 | 53 | static const struct ppp_channel_ops pptp_chan_ops; |
00959ade DK |
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; | |
ebd8b934 | 84 | __be16 protocol; |
85 | __be16 payload_len; | |
86 | __be16 call_id; | |
87 | __be32 seq; | |
88 | __be32 ack; | |
00959ade DK |
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(); | |
99427747 AM |
117 | i = 1; |
118 | for_each_set_bit_from(i, callid_bitmap, MAX_CALLID) { | |
00959ade DK |
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 | { | |
134 | static int call_id; | |
135 | ||
136 | spin_lock(&chan_lock); | |
137 | if (!sock->proto.pptp.src_addr.call_id) { | |
138 | call_id = find_next_zero_bit(callid_bitmap, MAX_CALLID, call_id + 1); | |
139 | if (call_id == MAX_CALLID) { | |
140 | call_id = find_next_zero_bit(callid_bitmap, MAX_CALLID, 1); | |
141 | if (call_id == MAX_CALLID) | |
142 | goto out_err; | |
143 | } | |
144 | sock->proto.pptp.src_addr.call_id = call_id; | |
145 | } else if (test_bit(sock->proto.pptp.src_addr.call_id, callid_bitmap)) | |
146 | goto out_err; | |
147 | ||
148 | set_bit(sock->proto.pptp.src_addr.call_id, callid_bitmap); | |
149 | rcu_assign_pointer(callid_sock[sock->proto.pptp.src_addr.call_id], sock); | |
150 | spin_unlock(&chan_lock); | |
151 | ||
152 | return 0; | |
153 | ||
154 | out_err: | |
155 | spin_unlock(&chan_lock); | |
156 | return -1; | |
157 | } | |
158 | ||
159 | static void del_chan(struct pppox_sock *sock) | |
160 | { | |
161 | spin_lock(&chan_lock); | |
162 | clear_bit(sock->proto.pptp.src_addr.call_id, callid_bitmap); | |
2cfa5a04 | 163 | RCU_INIT_POINTER(callid_sock[sock->proto.pptp.src_addr.call_id], NULL); |
00959ade DK |
164 | spin_unlock(&chan_lock); |
165 | synchronize_rcu(); | |
166 | } | |
167 | ||
168 | static int pptp_xmit(struct ppp_channel *chan, struct sk_buff *skb) | |
169 | { | |
170 | struct sock *sk = (struct sock *) chan->private; | |
171 | struct pppox_sock *po = pppox_sk(sk); | |
172 | struct pptp_opt *opt = &po->proto.pptp; | |
173 | struct pptp_gre_header *hdr; | |
174 | unsigned int header_len = sizeof(*hdr); | |
31e4543d | 175 | struct flowi4 fl4; |
00959ade DK |
176 | int islcp; |
177 | int len; | |
178 | unsigned char *data; | |
179 | __u32 seq_recv; | |
180 | ||
181 | ||
182 | struct rtable *rt; | |
183 | struct net_device *tdev; | |
184 | struct iphdr *iph; | |
185 | int max_headroom; | |
186 | ||
187 | if (sk_pppox(po)->sk_state & PPPOX_DEAD) | |
188 | goto tx_error; | |
189 | ||
08252b32 | 190 | rt = ip_route_output_ports(sock_net(sk), &fl4, NULL, |
78fbfd8a DM |
191 | opt->dst_addr.sin_addr.s_addr, |
192 | opt->src_addr.sin_addr.s_addr, | |
193 | 0, 0, IPPROTO_GRE, | |
194 | RT_TOS(0), 0); | |
195 | if (IS_ERR(rt)) | |
196 | goto tx_error; | |
197 | ||
00959ade DK |
198 | tdev = rt->dst.dev; |
199 | ||
200 | max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(*iph) + sizeof(*hdr) + 2; | |
201 | ||
202 | if (skb_headroom(skb) < max_headroom || skb_cloned(skb) || skb_shared(skb)) { | |
203 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); | |
204 | if (!new_skb) { | |
205 | ip_rt_put(rt); | |
206 | goto tx_error; | |
207 | } | |
208 | if (skb->sk) | |
209 | skb_set_owner_w(new_skb, skb->sk); | |
968d7018 | 210 | consume_skb(skb); |
00959ade DK |
211 | skb = new_skb; |
212 | } | |
213 | ||
214 | data = skb->data; | |
215 | islcp = ((data[0] << 8) + data[1]) == PPP_LCP && 1 <= data[2] && data[2] <= 7; | |
216 | ||
217 | /* compress protocol field */ | |
218 | if ((opt->ppp_flags & SC_COMP_PROT) && data[0] == 0 && !islcp) | |
219 | skb_pull(skb, 1); | |
220 | ||
221 | /* Put in the address/control bytes if necessary */ | |
222 | if ((opt->ppp_flags & SC_COMP_AC) == 0 || islcp) { | |
223 | data = skb_push(skb, 2); | |
224 | data[0] = PPP_ALLSTATIONS; | |
225 | data[1] = PPP_UI; | |
226 | } | |
227 | ||
228 | len = skb->len; | |
229 | ||
230 | seq_recv = opt->seq_recv; | |
231 | ||
232 | if (opt->ack_sent == seq_recv) | |
233 | header_len -= sizeof(hdr->ack); | |
234 | ||
235 | /* Push down and install GRE header */ | |
236 | skb_push(skb, header_len); | |
237 | hdr = (struct pptp_gre_header *)(skb->data); | |
238 | ||
239 | hdr->flags = PPTP_GRE_FLAG_K; | |
240 | hdr->ver = PPTP_GRE_VER; | |
241 | hdr->protocol = htons(PPTP_GRE_PROTO); | |
242 | hdr->call_id = htons(opt->dst_addr.call_id); | |
243 | ||
244 | hdr->flags |= PPTP_GRE_FLAG_S; | |
245 | hdr->seq = htonl(++opt->seq_sent); | |
246 | if (opt->ack_sent != seq_recv) { | |
247 | /* send ack with this message */ | |
248 | hdr->ver |= PPTP_GRE_FLAG_A; | |
249 | hdr->ack = htonl(seq_recv); | |
250 | opt->ack_sent = seq_recv; | |
251 | } | |
252 | hdr->payload_len = htons(len); | |
253 | ||
254 | /* Push down and install the IP header. */ | |
255 | ||
256 | skb_reset_transport_header(skb); | |
257 | skb_push(skb, sizeof(*iph)); | |
258 | skb_reset_network_header(skb); | |
259 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
260 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | IPSKB_REROUTED); | |
261 | ||
262 | iph = ip_hdr(skb); | |
263 | iph->version = 4; | |
264 | iph->ihl = sizeof(struct iphdr) >> 2; | |
265 | if (ip_dont_fragment(sk, &rt->dst)) | |
266 | iph->frag_off = htons(IP_DF); | |
267 | else | |
268 | iph->frag_off = 0; | |
269 | iph->protocol = IPPROTO_GRE; | |
270 | iph->tos = 0; | |
28c90da0 DM |
271 | iph->daddr = fl4.daddr; |
272 | iph->saddr = fl4.saddr; | |
323e126f | 273 | iph->ttl = ip4_dst_hoplimit(&rt->dst); |
00959ade DK |
274 | iph->tot_len = htons(skb->len); |
275 | ||
276 | skb_dst_drop(skb); | |
277 | skb_dst_set(skb, &rt->dst); | |
278 | ||
279 | nf_reset(skb); | |
280 | ||
281 | skb->ip_summed = CHECKSUM_NONE; | |
b6a7719a | 282 | ip_select_ident(sock_net(sk), skb, NULL); |
00959ade DK |
283 | ip_send_check(iph); |
284 | ||
285 | ip_local_out(skb); | |
8bae8bd6 | 286 | return 1; |
00959ade DK |
287 | |
288 | tx_error: | |
8bae8bd6 | 289 | kfree_skb(skb); |
00959ade DK |
290 | return 1; |
291 | } | |
292 | ||
293 | static int pptp_rcv_core(struct sock *sk, struct sk_buff *skb) | |
294 | { | |
295 | struct pppox_sock *po = pppox_sk(sk); | |
296 | struct pptp_opt *opt = &po->proto.pptp; | |
297 | int headersize, payload_len, seq; | |
298 | __u8 *payload; | |
299 | struct pptp_gre_header *header; | |
300 | ||
301 | if (!(sk->sk_state & PPPOX_CONNECTED)) { | |
302 | if (sock_queue_rcv_skb(sk, skb)) | |
303 | goto drop; | |
304 | return NET_RX_SUCCESS; | |
305 | } | |
306 | ||
307 | header = (struct pptp_gre_header *)(skb->data); | |
4ea2739e | 308 | headersize = sizeof(*header); |
00959ade DK |
309 | |
310 | /* test if acknowledgement present */ | |
311 | if (PPTP_GRE_IS_A(header->ver)) { | |
4ea2739e ED |
312 | __u32 ack; |
313 | ||
314 | if (!pskb_may_pull(skb, headersize)) | |
315 | goto drop; | |
316 | header = (struct pptp_gre_header *)(skb->data); | |
317 | ||
318 | /* ack in different place if S = 0 */ | |
319 | ack = PPTP_GRE_IS_S(header->flags) ? header->ack : header->seq; | |
00959ade DK |
320 | |
321 | ack = ntohl(ack); | |
322 | ||
323 | if (ack > opt->ack_recv) | |
324 | opt->ack_recv = ack; | |
325 | /* also handle sequence number wrap-around */ | |
326 | if (WRAPPED(ack, opt->ack_recv)) | |
327 | opt->ack_recv = ack; | |
4ea2739e ED |
328 | } else { |
329 | headersize -= sizeof(header->ack); | |
00959ade | 330 | } |
00959ade DK |
331 | /* test if payload present */ |
332 | if (!PPTP_GRE_IS_S(header->flags)) | |
333 | goto drop; | |
334 | ||
00959ade DK |
335 | payload_len = ntohs(header->payload_len); |
336 | seq = ntohl(header->seq); | |
337 | ||
00959ade | 338 | /* check for incomplete packet (length smaller than expected) */ |
4ea2739e | 339 | if (!pskb_may_pull(skb, headersize + payload_len)) |
00959ade DK |
340 | goto drop; |
341 | ||
342 | payload = skb->data + headersize; | |
343 | /* check for expected sequence number */ | |
344 | if (seq < opt->seq_recv + 1 || WRAPPED(opt->seq_recv, seq)) { | |
345 | if ((payload[0] == PPP_ALLSTATIONS) && (payload[1] == PPP_UI) && | |
346 | (PPP_PROTOCOL(payload) == PPP_LCP) && | |
347 | ((payload[4] == PPP_LCP_ECHOREQ) || (payload[4] == PPP_LCP_ECHOREP))) | |
348 | goto allow_packet; | |
349 | } else { | |
350 | opt->seq_recv = seq; | |
351 | allow_packet: | |
352 | skb_pull(skb, headersize); | |
353 | ||
354 | if (payload[0] == PPP_ALLSTATIONS && payload[1] == PPP_UI) { | |
355 | /* chop off address/control */ | |
356 | if (skb->len < 3) | |
357 | goto drop; | |
358 | skb_pull(skb, 2); | |
359 | } | |
360 | ||
361 | if ((*skb->data) & 1) { | |
362 | /* protocol is compressed */ | |
363 | skb_push(skb, 1)[0] = 0; | |
364 | } | |
365 | ||
366 | skb->ip_summed = CHECKSUM_NONE; | |
367 | skb_set_network_header(skb, skb->head-skb->data); | |
368 | ppp_input(&po->chan, skb); | |
369 | ||
370 | return NET_RX_SUCCESS; | |
371 | } | |
372 | drop: | |
373 | kfree_skb(skb); | |
374 | return NET_RX_DROP; | |
375 | } | |
376 | ||
377 | static int pptp_rcv(struct sk_buff *skb) | |
378 | { | |
379 | struct pppox_sock *po; | |
380 | struct pptp_gre_header *header; | |
381 | struct iphdr *iph; | |
382 | ||
383 | if (skb->pkt_type != PACKET_HOST) | |
384 | goto drop; | |
385 | ||
386 | if (!pskb_may_pull(skb, 12)) | |
387 | goto drop; | |
388 | ||
389 | iph = ip_hdr(skb); | |
390 | ||
391 | header = (struct pptp_gre_header *)skb->data; | |
392 | ||
393 | if (ntohs(header->protocol) != PPTP_GRE_PROTO || /* PPTP-GRE protocol for PPTP */ | |
394 | PPTP_GRE_IS_C(header->flags) || /* flag C should be clear */ | |
395 | PPTP_GRE_IS_R(header->flags) || /* flag R should be clear */ | |
396 | !PPTP_GRE_IS_K(header->flags) || /* flag K should be set */ | |
397 | (header->flags&0xF) != 0) /* routing and recursion ctrl = 0 */ | |
398 | /* if invalid, discard this packet */ | |
399 | goto drop; | |
400 | ||
401 | po = lookup_chan(htons(header->call_id), iph->saddr); | |
402 | if (po) { | |
403 | skb_dst_drop(skb); | |
404 | nf_reset(skb); | |
405 | return sk_receive_skb(sk_pppox(po), skb, 0); | |
406 | } | |
407 | drop: | |
408 | kfree_skb(skb); | |
409 | return NET_RX_DROP; | |
410 | } | |
411 | ||
412 | static int pptp_bind(struct socket *sock, struct sockaddr *uservaddr, | |
413 | int sockaddr_len) | |
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 | int error = 0; | |
420 | ||
421 | lock_sock(sk); | |
422 | ||
423 | opt->src_addr = sp->sa_addr.pptp; | |
a454dace | 424 | if (add_chan(po)) |
00959ade | 425 | error = -EBUSY; |
00959ade DK |
426 | |
427 | release_sock(sk); | |
428 | return error; | |
429 | } | |
430 | ||
431 | static int pptp_connect(struct socket *sock, struct sockaddr *uservaddr, | |
432 | int sockaddr_len, int flags) | |
433 | { | |
434 | struct sock *sk = sock->sk; | |
435 | struct sockaddr_pppox *sp = (struct sockaddr_pppox *) uservaddr; | |
436 | struct pppox_sock *po = pppox_sk(sk); | |
437 | struct pptp_opt *opt = &po->proto.pptp; | |
438 | struct rtable *rt; | |
31e4543d | 439 | struct flowi4 fl4; |
00959ade DK |
440 | int error = 0; |
441 | ||
442 | if (sp->sa_protocol != PX_PROTO_PPTP) | |
443 | return -EINVAL; | |
444 | ||
445 | if (lookup_chan_dst(sp->sa_addr.pptp.call_id, sp->sa_addr.pptp.sin_addr.s_addr)) | |
446 | return -EALREADY; | |
447 | ||
448 | lock_sock(sk); | |
449 | /* Check for already bound sockets */ | |
450 | if (sk->sk_state & PPPOX_CONNECTED) { | |
451 | error = -EBUSY; | |
452 | goto end; | |
453 | } | |
454 | ||
455 | /* Check for already disconnected sockets, on attempts to disconnect */ | |
456 | if (sk->sk_state & PPPOX_DEAD) { | |
457 | error = -EALREADY; | |
458 | goto end; | |
459 | } | |
460 | ||
461 | if (!opt->src_addr.sin_addr.s_addr || !sp->sa_addr.pptp.sin_addr.s_addr) { | |
462 | error = -EINVAL; | |
463 | goto end; | |
464 | } | |
465 | ||
466 | po->chan.private = sk; | |
467 | po->chan.ops = &pptp_chan_ops; | |
468 | ||
08252b32 | 469 | rt = ip_route_output_ports(sock_net(sk), &fl4, sk, |
78fbfd8a DM |
470 | opt->dst_addr.sin_addr.s_addr, |
471 | opt->src_addr.sin_addr.s_addr, | |
472 | 0, 0, | |
473 | IPPROTO_GRE, RT_CONN_FLAGS(sk), 0); | |
474 | if (IS_ERR(rt)) { | |
475 | error = -EHOSTUNREACH; | |
476 | goto end; | |
00959ade | 477 | } |
78fbfd8a DM |
478 | sk_setup_caps(sk, &rt->dst); |
479 | ||
00959ade DK |
480 | po->chan.mtu = dst_mtu(&rt->dst); |
481 | if (!po->chan.mtu) | |
bf7daebb | 482 | po->chan.mtu = PPP_MRU; |
00959ade DK |
483 | ip_rt_put(rt); |
484 | po->chan.mtu -= PPTP_HEADER_OVERHEAD; | |
485 | ||
486 | po->chan.hdrlen = 2 + sizeof(struct pptp_gre_header); | |
487 | error = ppp_register_channel(&po->chan); | |
488 | if (error) { | |
489 | pr_err("PPTP: failed to register PPP channel (%d)\n", error); | |
490 | goto end; | |
491 | } | |
492 | ||
493 | opt->dst_addr = sp->sa_addr.pptp; | |
494 | sk->sk_state = PPPOX_CONNECTED; | |
495 | ||
496 | end: | |
497 | release_sock(sk); | |
498 | return error; | |
499 | } | |
500 | ||
501 | static int pptp_getname(struct socket *sock, struct sockaddr *uaddr, | |
502 | int *usockaddr_len, int peer) | |
503 | { | |
504 | int len = sizeof(struct sockaddr_pppox); | |
505 | struct sockaddr_pppox sp; | |
506 | ||
a5f6fc28 MK |
507 | memset(&sp.sa_addr, 0, sizeof(sp.sa_addr)); |
508 | ||
509 | sp.sa_family = AF_PPPOX; | |
00959ade DK |
510 | sp.sa_protocol = PX_PROTO_PPTP; |
511 | sp.sa_addr.pptp = pppox_sk(sock->sk)->proto.pptp.src_addr; | |
512 | ||
513 | memcpy(uaddr, &sp, len); | |
514 | ||
515 | *usockaddr_len = len; | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
520 | static int pptp_release(struct socket *sock) | |
521 | { | |
522 | struct sock *sk = sock->sk; | |
523 | struct pppox_sock *po; | |
524 | struct pptp_opt *opt; | |
525 | int error = 0; | |
526 | ||
527 | if (!sk) | |
528 | return 0; | |
529 | ||
530 | lock_sock(sk); | |
531 | ||
532 | if (sock_flag(sk, SOCK_DEAD)) { | |
533 | release_sock(sk); | |
534 | return -EBADF; | |
535 | } | |
536 | ||
537 | po = pppox_sk(sk); | |
538 | opt = &po->proto.pptp; | |
539 | del_chan(po); | |
540 | ||
541 | pppox_unbind_sock(sk); | |
542 | sk->sk_state = PPPOX_DEAD; | |
543 | ||
544 | sock_orphan(sk); | |
545 | sock->sk = NULL; | |
546 | ||
547 | release_sock(sk); | |
548 | sock_put(sk); | |
549 | ||
550 | return error; | |
551 | } | |
552 | ||
553 | static void pptp_sock_destruct(struct sock *sk) | |
554 | { | |
555 | if (!(sk->sk_state & PPPOX_DEAD)) { | |
556 | del_chan(pppox_sk(sk)); | |
557 | pppox_unbind_sock(sk); | |
558 | } | |
559 | skb_queue_purge(&sk->sk_receive_queue); | |
560 | } | |
561 | ||
11aa9c28 | 562 | static int pptp_create(struct net *net, struct socket *sock, int kern) |
00959ade DK |
563 | { |
564 | int error = -ENOMEM; | |
565 | struct sock *sk; | |
566 | struct pppox_sock *po; | |
567 | struct pptp_opt *opt; | |
568 | ||
11aa9c28 | 569 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pptp_sk_proto, kern); |
00959ade DK |
570 | if (!sk) |
571 | goto out; | |
572 | ||
573 | sock_init_data(sock, sk); | |
574 | ||
575 | sock->state = SS_UNCONNECTED; | |
576 | sock->ops = &pptp_ops; | |
577 | ||
578 | sk->sk_backlog_rcv = pptp_rcv_core; | |
579 | sk->sk_state = PPPOX_NONE; | |
580 | sk->sk_type = SOCK_STREAM; | |
581 | sk->sk_family = PF_PPPOX; | |
582 | sk->sk_protocol = PX_PROTO_PPTP; | |
583 | sk->sk_destruct = pptp_sock_destruct; | |
584 | ||
585 | po = pppox_sk(sk); | |
586 | opt = &po->proto.pptp; | |
587 | ||
91dce7dd BP |
588 | opt->seq_sent = 0; opt->seq_recv = 0xffffffff; |
589 | opt->ack_recv = 0; opt->ack_sent = 0xffffffff; | |
00959ade DK |
590 | |
591 | error = 0; | |
592 | out: | |
593 | return error; | |
594 | } | |
595 | ||
596 | static int pptp_ppp_ioctl(struct ppp_channel *chan, unsigned int cmd, | |
597 | unsigned long arg) | |
598 | { | |
599 | struct sock *sk = (struct sock *) chan->private; | |
600 | struct pppox_sock *po = pppox_sk(sk); | |
601 | struct pptp_opt *opt = &po->proto.pptp; | |
602 | void __user *argp = (void __user *)arg; | |
603 | int __user *p = argp; | |
604 | int err, val; | |
605 | ||
606 | err = -EFAULT; | |
607 | switch (cmd) { | |
608 | case PPPIOCGFLAGS: | |
609 | val = opt->ppp_flags; | |
610 | if (put_user(val, p)) | |
611 | break; | |
612 | err = 0; | |
613 | break; | |
614 | case PPPIOCSFLAGS: | |
615 | if (get_user(val, p)) | |
616 | break; | |
617 | opt->ppp_flags = val & ~SC_RCV_BITS; | |
618 | err = 0; | |
619 | break; | |
620 | default: | |
621 | err = -ENOTTY; | |
622 | } | |
623 | ||
624 | return err; | |
625 | } | |
626 | ||
756e64a0 | 627 | static const struct ppp_channel_ops pptp_chan_ops = { |
00959ade DK |
628 | .start_xmit = pptp_xmit, |
629 | .ioctl = pptp_ppp_ioctl, | |
630 | }; | |
631 | ||
632 | static struct proto pptp_sk_proto __read_mostly = { | |
633 | .name = "PPTP", | |
634 | .owner = THIS_MODULE, | |
635 | .obj_size = sizeof(struct pppox_sock), | |
636 | }; | |
637 | ||
638 | static const struct proto_ops pptp_ops = { | |
639 | .family = AF_PPPOX, | |
640 | .owner = THIS_MODULE, | |
641 | .release = pptp_release, | |
642 | .bind = pptp_bind, | |
643 | .connect = pptp_connect, | |
644 | .socketpair = sock_no_socketpair, | |
645 | .accept = sock_no_accept, | |
646 | .getname = pptp_getname, | |
647 | .poll = sock_no_poll, | |
648 | .listen = sock_no_listen, | |
649 | .shutdown = sock_no_shutdown, | |
650 | .setsockopt = sock_no_setsockopt, | |
651 | .getsockopt = sock_no_getsockopt, | |
652 | .sendmsg = sock_no_sendmsg, | |
653 | .recvmsg = sock_no_recvmsg, | |
654 | .mmap = sock_no_mmap, | |
655 | .ioctl = pppox_ioctl, | |
656 | }; | |
657 | ||
756e64a0 | 658 | static const struct pppox_proto pppox_pptp_proto = { |
00959ade DK |
659 | .create = pptp_create, |
660 | .owner = THIS_MODULE, | |
661 | }; | |
662 | ||
756e64a0 | 663 | static const struct gre_protocol gre_pptp_protocol = { |
00959ade DK |
664 | .handler = pptp_rcv, |
665 | }; | |
666 | ||
667 | static int __init pptp_init_module(void) | |
668 | { | |
669 | int err = 0; | |
670 | pr_info("PPTP driver version " PPTP_DRIVER_VERSION "\n"); | |
671 | ||
89bf67f1 | 672 | callid_sock = vzalloc((MAX_CALLID + 1) * sizeof(void *)); |
e404decb | 673 | if (!callid_sock) |
00959ade | 674 | return -ENOMEM; |
00959ade DK |
675 | |
676 | err = gre_add_protocol(&gre_pptp_protocol, GREPROTO_PPTP); | |
677 | if (err) { | |
678 | pr_err("PPTP: can't add gre protocol\n"); | |
679 | goto out_mem_free; | |
680 | } | |
681 | ||
682 | err = proto_register(&pptp_sk_proto, 0); | |
683 | if (err) { | |
684 | pr_err("PPTP: can't register sk_proto\n"); | |
685 | goto out_gre_del_protocol; | |
686 | } | |
687 | ||
688 | err = register_pppox_proto(PX_PROTO_PPTP, &pppox_pptp_proto); | |
689 | if (err) { | |
690 | pr_err("PPTP: can't register pppox_proto\n"); | |
691 | goto out_unregister_sk_proto; | |
692 | } | |
693 | ||
694 | return 0; | |
695 | ||
696 | out_unregister_sk_proto: | |
697 | proto_unregister(&pptp_sk_proto); | |
698 | out_gre_del_protocol: | |
699 | gre_del_protocol(&gre_pptp_protocol, GREPROTO_PPTP); | |
700 | out_mem_free: | |
701 | vfree(callid_sock); | |
702 | ||
703 | return err; | |
704 | } | |
705 | ||
706 | static void __exit pptp_exit_module(void) | |
707 | { | |
708 | unregister_pppox_proto(PX_PROTO_PPTP); | |
709 | proto_unregister(&pptp_sk_proto); | |
710 | gre_del_protocol(&gre_pptp_protocol, GREPROTO_PPTP); | |
711 | vfree(callid_sock); | |
712 | } | |
713 | ||
714 | module_init(pptp_init_module); | |
715 | module_exit(pptp_exit_module); | |
716 | ||
717 | MODULE_DESCRIPTION("Point-to-Point Tunneling Protocol"); | |
718 | MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)"); | |
719 | MODULE_LICENSE("GPL"); |