1 /*
2 * L2TP netlink layer, for management
3 *
4 * Copyright (c) 2008,2009,2010 Katalix Systems Ltd
5 *
6 * Partly based on the IrDA nelink implementation
7 * (see net/irda/irnetlink.c) which is:
8 * Copyright (c) 2007 Samuel Ortiz <samuel@sortiz.org>
9 * which is in turn partly based on the wireless netlink code:
10 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 */
16
17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18
19 #include <net/sock.h>
20 #include <net/genetlink.h>
21 #include <net/udp.h>
22 #include <linux/in.h>
23 #include <linux/udp.h>
24 #include <linux/socket.h>
25 #include <linux/module.h>
26 #include <linux/list.h>
27 #include <net/net_namespace.h>
28
29 #include <linux/l2tp.h>
30
31 #include "l2tp_core.h"
32
33
34 static struct genl_family l2tp_nl_family = {
35 .id = GENL_ID_GENERATE,
36 .name = L2TP_GENL_NAME,
37 .version = L2TP_GENL_VERSION,
38 .hdrsize = 0,
39 .maxattr = L2TP_ATTR_MAX,
40 .netnsok = true,
41 };
42
43 static const struct genl_multicast_group l2tp_multicast_group[] = {
44 {
45 .name = L2TP_GENL_MCGROUP,
46 },
47 };
48
49 static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq,
50 int flags, struct l2tp_tunnel *tunnel, u8 cmd);
51 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq,
52 int flags, struct l2tp_session *session,
53 u8 cmd);
54
55 /* Accessed under genl lock */
56 static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
57
l2tp_nl_session_find(struct genl_info * info)58 static struct l2tp_session *l2tp_nl_session_find(struct genl_info *info)
59 {
60 u32 tunnel_id;
61 u32 session_id;
62 char *ifname;
63 struct l2tp_tunnel *tunnel;
64 struct l2tp_session *session = NULL;
65 struct net *net = genl_info_net(info);
66
67 if (info->attrs[L2TP_ATTR_IFNAME]) {
68 ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
69 session = l2tp_session_find_by_ifname(net, ifname);
70 } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) &&
71 (info->attrs[L2TP_ATTR_CONN_ID])) {
72 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
73 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
74 tunnel = l2tp_tunnel_find(net, tunnel_id);
75 if (tunnel)
76 session = l2tp_session_find(net, tunnel, session_id);
77 }
78
79 return session;
80 }
81
l2tp_nl_cmd_noop(struct sk_buff * skb,struct genl_info * info)82 static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
83 {
84 struct sk_buff *msg;
85 void *hdr;
86 int ret = -ENOBUFS;
87
88 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
89 if (!msg) {
90 ret = -ENOMEM;
91 goto out;
92 }
93
94 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
95 &l2tp_nl_family, 0, L2TP_CMD_NOOP);
96 if (!hdr) {
97 ret = -EMSGSIZE;
98 goto err_out;
99 }
100
101 genlmsg_end(msg, hdr);
102
103 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
104
105 err_out:
106 nlmsg_free(msg);
107
108 out:
109 return ret;
110 }
111
l2tp_tunnel_notify(struct genl_family * family,struct genl_info * info,struct l2tp_tunnel * tunnel,u8 cmd)112 static int l2tp_tunnel_notify(struct genl_family *family,
113 struct genl_info *info,
114 struct l2tp_tunnel *tunnel,
115 u8 cmd)
116 {
117 struct sk_buff *msg;
118 int ret;
119
120 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
121 if (!msg)
122 return -ENOMEM;
123
124 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
125 NLM_F_ACK, tunnel, cmd);
126
127 if (ret >= 0) {
128 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
129 /* We don't care if no one is listening */
130 if (ret == -ESRCH)
131 ret = 0;
132 return ret;
133 }
134
135 nlmsg_free(msg);
136
137 return ret;
138 }
139
l2tp_session_notify(struct genl_family * family,struct genl_info * info,struct l2tp_session * session,u8 cmd)140 static int l2tp_session_notify(struct genl_family *family,
141 struct genl_info *info,
142 struct l2tp_session *session,
143 u8 cmd)
144 {
145 struct sk_buff *msg;
146 int ret;
147
148 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
149 if (!msg)
150 return -ENOMEM;
151
152 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
153 NLM_F_ACK, session, cmd);
154
155 if (ret >= 0) {
156 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
157 /* We don't care if no one is listening */
158 if (ret == -ESRCH)
159 ret = 0;
160 return ret;
161 }
162
163 nlmsg_free(msg);
164
165 return ret;
166 }
167
l2tp_nl_cmd_tunnel_create(struct sk_buff * skb,struct genl_info * info)168 static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
169 {
170 u32 tunnel_id;
171 u32 peer_tunnel_id;
172 int proto_version;
173 int fd;
174 int ret = 0;
175 struct l2tp_tunnel_cfg cfg = { 0, };
176 struct l2tp_tunnel *tunnel;
177 struct net *net = genl_info_net(info);
178
179 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
180 ret = -EINVAL;
181 goto out;
182 }
183 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
184
185 if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) {
186 ret = -EINVAL;
187 goto out;
188 }
189 peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]);
190
191 if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) {
192 ret = -EINVAL;
193 goto out;
194 }
195 proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]);
196
197 if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) {
198 ret = -EINVAL;
199 goto out;
200 }
201 cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]);
202
203 fd = -1;
204 if (info->attrs[L2TP_ATTR_FD]) {
205 fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
206 } else {
207 #if IS_ENABLED(CONFIG_IPV6)
208 if (info->attrs[L2TP_ATTR_IP6_SADDR] &&
209 info->attrs[L2TP_ATTR_IP6_DADDR]) {
210 cfg.local_ip6 = nla_data(
211 info->attrs[L2TP_ATTR_IP6_SADDR]);
212 cfg.peer_ip6 = nla_data(
213 info->attrs[L2TP_ATTR_IP6_DADDR]);
214 } else
215 #endif
216 if (info->attrs[L2TP_ATTR_IP_SADDR] &&
217 info->attrs[L2TP_ATTR_IP_DADDR]) {
218 cfg.local_ip.s_addr = nla_get_in_addr(
219 info->attrs[L2TP_ATTR_IP_SADDR]);
220 cfg.peer_ip.s_addr = nla_get_in_addr(
221 info->attrs[L2TP_ATTR_IP_DADDR]);
222 } else {
223 ret = -EINVAL;
224 goto out;
225 }
226 if (info->attrs[L2TP_ATTR_UDP_SPORT])
227 cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]);
228 if (info->attrs[L2TP_ATTR_UDP_DPORT])
229 cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]);
230 if (info->attrs[L2TP_ATTR_UDP_CSUM])
231 cfg.use_udp_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_CSUM]);
232
233 #if IS_ENABLED(CONFIG_IPV6)
234 if (info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX])
235 cfg.udp6_zero_tx_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]);
236 if (info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX])
237 cfg.udp6_zero_rx_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]);
238 #endif
239 }
240
241 if (info->attrs[L2TP_ATTR_DEBUG])
242 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
243
244 tunnel = l2tp_tunnel_find(net, tunnel_id);
245 if (tunnel != NULL) {
246 ret = -EEXIST;
247 goto out;
248 }
249
250 ret = -EINVAL;
251 switch (cfg.encap) {
252 case L2TP_ENCAPTYPE_UDP:
253 case L2TP_ENCAPTYPE_IP:
254 ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
255 peer_tunnel_id, &cfg, &tunnel);
256 break;
257 }
258
259 if (ret >= 0)
260 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
261 tunnel, L2TP_CMD_TUNNEL_CREATE);
262 out:
263 return ret;
264 }
265
l2tp_nl_cmd_tunnel_delete(struct sk_buff * skb,struct genl_info * info)266 static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
267 {
268 struct l2tp_tunnel *tunnel;
269 u32 tunnel_id;
270 int ret = 0;
271 struct net *net = genl_info_net(info);
272
273 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
274 ret = -EINVAL;
275 goto out;
276 }
277 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
278
279 tunnel = l2tp_tunnel_find(net, tunnel_id);
280 if (tunnel == NULL) {
281 ret = -ENODEV;
282 goto out;
283 }
284
285 l2tp_tunnel_notify(&l2tp_nl_family, info,
286 tunnel, L2TP_CMD_TUNNEL_DELETE);
287
288 (void) l2tp_tunnel_delete(tunnel);
289
290 out:
291 return ret;
292 }
293
l2tp_nl_cmd_tunnel_modify(struct sk_buff * skb,struct genl_info * info)294 static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
295 {
296 struct l2tp_tunnel *tunnel;
297 u32 tunnel_id;
298 int ret = 0;
299 struct net *net = genl_info_net(info);
300
301 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
302 ret = -EINVAL;
303 goto out;
304 }
305 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
306
307 tunnel = l2tp_tunnel_find(net, tunnel_id);
308 if (tunnel == NULL) {
309 ret = -ENODEV;
310 goto out;
311 }
312
313 if (info->attrs[L2TP_ATTR_DEBUG])
314 tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
315
316 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
317 tunnel, L2TP_CMD_TUNNEL_MODIFY);
318
319 out:
320 return ret;
321 }
322
l2tp_nl_tunnel_send(struct sk_buff * skb,u32 portid,u32 seq,int flags,struct l2tp_tunnel * tunnel,u8 cmd)323 static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
324 struct l2tp_tunnel *tunnel, u8 cmd)
325 {
326 void *hdr;
327 struct nlattr *nest;
328 struct sock *sk = NULL;
329 struct inet_sock *inet;
330 #if IS_ENABLED(CONFIG_IPV6)
331 struct ipv6_pinfo *np = NULL;
332 #endif
333
334 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
335 if (!hdr)
336 return -EMSGSIZE;
337
338 if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
339 nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
340 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
341 nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) ||
342 nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
343 goto nla_put_failure;
344
345 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
346 if (nest == NULL)
347 goto nla_put_failure;
348
349 if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS,
350 atomic_long_read(&tunnel->stats.tx_packets)) ||
351 nla_put_u64(skb, L2TP_ATTR_TX_BYTES,
352 atomic_long_read(&tunnel->stats.tx_bytes)) ||
353 nla_put_u64(skb, L2TP_ATTR_TX_ERRORS,
354 atomic_long_read(&tunnel->stats.tx_errors)) ||
355 nla_put_u64(skb, L2TP_ATTR_RX_PACKETS,
356 atomic_long_read(&tunnel->stats.rx_packets)) ||
357 nla_put_u64(skb, L2TP_ATTR_RX_BYTES,
358 atomic_long_read(&tunnel->stats.rx_bytes)) ||
359 nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
360 atomic_long_read(&tunnel->stats.rx_seq_discards)) ||
361 nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS,
362 atomic_long_read(&tunnel->stats.rx_oos_packets)) ||
363 nla_put_u64(skb, L2TP_ATTR_RX_ERRORS,
364 atomic_long_read(&tunnel->stats.rx_errors)))
365 goto nla_put_failure;
366 nla_nest_end(skb, nest);
367
368 sk = tunnel->sock;
369 if (!sk)
370 goto out;
371
372 #if IS_ENABLED(CONFIG_IPV6)
373 if (sk->sk_family == AF_INET6)
374 np = inet6_sk(sk);
375 #endif
376
377 inet = inet_sk(sk);
378
379 switch (tunnel->encap) {
380 case L2TP_ENCAPTYPE_UDP:
381 if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
382 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)) ||
383 nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx))
384 goto nla_put_failure;
385 /* NOBREAK */
386 case L2TP_ENCAPTYPE_IP:
387 #if IS_ENABLED(CONFIG_IPV6)
388 if (np) {
389 if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR,
390 &np->saddr) ||
391 nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR,
392 &sk->sk_v6_daddr))
393 goto nla_put_failure;
394 } else
395 #endif
396 if (nla_put_in_addr(skb, L2TP_ATTR_IP_SADDR,
397 inet->inet_saddr) ||
398 nla_put_in_addr(skb, L2TP_ATTR_IP_DADDR,
399 inet->inet_daddr))
400 goto nla_put_failure;
401 break;
402 }
403
404 out:
405 genlmsg_end(skb, hdr);
406 return 0;
407
408 nla_put_failure:
409 genlmsg_cancel(skb, hdr);
410 return -1;
411 }
412
l2tp_nl_cmd_tunnel_get(struct sk_buff * skb,struct genl_info * info)413 static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
414 {
415 struct l2tp_tunnel *tunnel;
416 struct sk_buff *msg;
417 u32 tunnel_id;
418 int ret = -ENOBUFS;
419 struct net *net = genl_info_net(info);
420
421 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
422 ret = -EINVAL;
423 goto out;
424 }
425
426 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
427
428 tunnel = l2tp_tunnel_find(net, tunnel_id);
429 if (tunnel == NULL) {
430 ret = -ENODEV;
431 goto out;
432 }
433
434 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
435 if (!msg) {
436 ret = -ENOMEM;
437 goto out;
438 }
439
440 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
441 NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET);
442 if (ret < 0)
443 goto err_out;
444
445 return genlmsg_unicast(net, msg, info->snd_portid);
446
447 err_out:
448 nlmsg_free(msg);
449
450 out:
451 return ret;
452 }
453
l2tp_nl_cmd_tunnel_dump(struct sk_buff * skb,struct netlink_callback * cb)454 static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
455 {
456 int ti = cb->args[0];
457 struct l2tp_tunnel *tunnel;
458 struct net *net = sock_net(skb->sk);
459
460 for (;;) {
461 tunnel = l2tp_tunnel_find_nth(net, ti);
462 if (tunnel == NULL)
463 goto out;
464
465 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
466 cb->nlh->nlmsg_seq, NLM_F_MULTI,
467 tunnel, L2TP_CMD_TUNNEL_GET) < 0)
468 goto out;
469
470 ti++;
471 }
472
473 out:
474 cb->args[0] = ti;
475
476 return skb->len;
477 }
478
l2tp_nl_cmd_session_create(struct sk_buff * skb,struct genl_info * info)479 static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
480 {
481 u32 tunnel_id = 0;
482 u32 session_id;
483 u32 peer_session_id;
484 int ret = 0;
485 struct l2tp_tunnel *tunnel;
486 struct l2tp_session *session;
487 struct l2tp_session_cfg cfg = { 0, };
488 struct net *net = genl_info_net(info);
489
490 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
491 ret = -EINVAL;
492 goto out;
493 }
494 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
495 tunnel = l2tp_tunnel_find(net, tunnel_id);
496 if (!tunnel) {
497 ret = -ENODEV;
498 goto out;
499 }
500
501 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
502 ret = -EINVAL;
503 goto out;
504 }
505 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
506 session = l2tp_session_find(net, tunnel, session_id);
507 if (session) {
508 ret = -EEXIST;
509 goto out;
510 }
511
512 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
513 ret = -EINVAL;
514 goto out;
515 }
516 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
517
518 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
519 ret = -EINVAL;
520 goto out;
521 }
522 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
523 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
524 ret = -EINVAL;
525 goto out;
526 }
527
528 if (tunnel->version > 2) {
529 if (info->attrs[L2TP_ATTR_OFFSET])
530 cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
531
532 if (info->attrs[L2TP_ATTR_DATA_SEQ])
533 cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
534
535 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
536 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
537 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
538
539 cfg.l2specific_len = 4;
540 if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
541 cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
542
543 if (info->attrs[L2TP_ATTR_COOKIE]) {
544 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
545 if (len > 8) {
546 ret = -EINVAL;
547 goto out;
548 }
549 cfg.cookie_len = len;
550 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
551 }
552 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
553 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
554 if (len > 8) {
555 ret = -EINVAL;
556 goto out;
557 }
558 cfg.peer_cookie_len = len;
559 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
560 }
561 if (info->attrs[L2TP_ATTR_IFNAME])
562 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
563
564 if (info->attrs[L2TP_ATTR_VLAN_ID])
565 cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
566 }
567
568 if (info->attrs[L2TP_ATTR_DEBUG])
569 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
570
571 if (info->attrs[L2TP_ATTR_RECV_SEQ])
572 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
573
574 if (info->attrs[L2TP_ATTR_SEND_SEQ])
575 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
576
577 if (info->attrs[L2TP_ATTR_LNS_MODE])
578 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
579
580 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
581 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
582
583 if (info->attrs[L2TP_ATTR_MTU])
584 cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
585
586 if (info->attrs[L2TP_ATTR_MRU])
587 cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
588
589 if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
590 (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
591 ret = -EPROTONOSUPPORT;
592 goto out;
593 }
594
595 /* Check that pseudowire-specific params are present */
596 switch (cfg.pw_type) {
597 case L2TP_PWTYPE_NONE:
598 break;
599 case L2TP_PWTYPE_ETH_VLAN:
600 if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
601 ret = -EINVAL;
602 goto out;
603 }
604 break;
605 case L2TP_PWTYPE_ETH:
606 break;
607 case L2TP_PWTYPE_PPP:
608 case L2TP_PWTYPE_PPP_AC:
609 break;
610 case L2TP_PWTYPE_IP:
611 default:
612 ret = -EPROTONOSUPPORT;
613 break;
614 }
615
616 ret = -EPROTONOSUPPORT;
617 if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create)
618 ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id,
619 session_id, peer_session_id, &cfg);
620
621 if (ret >= 0) {
622 session = l2tp_session_find(net, tunnel, session_id);
623 if (session)
624 ret = l2tp_session_notify(&l2tp_nl_family, info, session,
625 L2TP_CMD_SESSION_CREATE);
626 }
627
628 out:
629 return ret;
630 }
631
l2tp_nl_cmd_session_delete(struct sk_buff * skb,struct genl_info * info)632 static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
633 {
634 int ret = 0;
635 struct l2tp_session *session;
636 u16 pw_type;
637
638 session = l2tp_nl_session_find(info);
639 if (session == NULL) {
640 ret = -ENODEV;
641 goto out;
642 }
643
644 l2tp_session_notify(&l2tp_nl_family, info,
645 session, L2TP_CMD_SESSION_DELETE);
646
647 pw_type = session->pwtype;
648 if (pw_type < __L2TP_PWTYPE_MAX)
649 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
650 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
651
652 out:
653 return ret;
654 }
655
l2tp_nl_cmd_session_modify(struct sk_buff * skb,struct genl_info * info)656 static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
657 {
658 int ret = 0;
659 struct l2tp_session *session;
660
661 session = l2tp_nl_session_find(info);
662 if (session == NULL) {
663 ret = -ENODEV;
664 goto out;
665 }
666
667 if (info->attrs[L2TP_ATTR_DEBUG])
668 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
669
670 if (info->attrs[L2TP_ATTR_DATA_SEQ])
671 session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
672
673 if (info->attrs[L2TP_ATTR_RECV_SEQ])
674 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
675
676 if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
677 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
678 l2tp_session_set_header_len(session, session->tunnel->version);
679 }
680
681 if (info->attrs[L2TP_ATTR_LNS_MODE])
682 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
683
684 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
685 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
686
687 if (info->attrs[L2TP_ATTR_MTU])
688 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
689
690 if (info->attrs[L2TP_ATTR_MRU])
691 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
692
693 ret = l2tp_session_notify(&l2tp_nl_family, info,
694 session, L2TP_CMD_SESSION_MODIFY);
695
696 out:
697 return ret;
698 }
699
l2tp_nl_session_send(struct sk_buff * skb,u32 portid,u32 seq,int flags,struct l2tp_session * session,u8 cmd)700 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
701 struct l2tp_session *session, u8 cmd)
702 {
703 void *hdr;
704 struct nlattr *nest;
705 struct l2tp_tunnel *tunnel = session->tunnel;
706 struct sock *sk = NULL;
707
708 sk = tunnel->sock;
709
710 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
711 if (!hdr)
712 return -EMSGSIZE;
713
714 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
715 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
716 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
717 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
718 session->peer_session_id) ||
719 nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
720 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) ||
721 nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) ||
722 (session->mru &&
723 nla_put_u16(skb, L2TP_ATTR_MRU, session->mru)))
724 goto nla_put_failure;
725
726 if ((session->ifname[0] &&
727 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
728 (session->cookie_len &&
729 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
730 &session->cookie[0])) ||
731 (session->peer_cookie_len &&
732 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
733 &session->peer_cookie[0])) ||
734 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
735 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
736 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
737 #ifdef CONFIG_XFRM
738 (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) &&
739 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
740 #endif
741 (session->reorder_timeout &&
742 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT, session->reorder_timeout)))
743 goto nla_put_failure;
744
745 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
746 if (nest == NULL)
747 goto nla_put_failure;
748
749 if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS,
750 atomic_long_read(&session->stats.tx_packets)) ||
751 nla_put_u64(skb, L2TP_ATTR_TX_BYTES,
752 atomic_long_read(&session->stats.tx_bytes)) ||
753 nla_put_u64(skb, L2TP_ATTR_TX_ERRORS,
754 atomic_long_read(&session->stats.tx_errors)) ||
755 nla_put_u64(skb, L2TP_ATTR_RX_PACKETS,
756 atomic_long_read(&session->stats.rx_packets)) ||
757 nla_put_u64(skb, L2TP_ATTR_RX_BYTES,
758 atomic_long_read(&session->stats.rx_bytes)) ||
759 nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
760 atomic_long_read(&session->stats.rx_seq_discards)) ||
761 nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS,
762 atomic_long_read(&session->stats.rx_oos_packets)) ||
763 nla_put_u64(skb, L2TP_ATTR_RX_ERRORS,
764 atomic_long_read(&session->stats.rx_errors)))
765 goto nla_put_failure;
766 nla_nest_end(skb, nest);
767
768 genlmsg_end(skb, hdr);
769 return 0;
770
771 nla_put_failure:
772 genlmsg_cancel(skb, hdr);
773 return -1;
774 }
775
l2tp_nl_cmd_session_get(struct sk_buff * skb,struct genl_info * info)776 static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
777 {
778 struct l2tp_session *session;
779 struct sk_buff *msg;
780 int ret;
781
782 session = l2tp_nl_session_find(info);
783 if (session == NULL) {
784 ret = -ENODEV;
785 goto out;
786 }
787
788 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
789 if (!msg) {
790 ret = -ENOMEM;
791 goto out;
792 }
793
794 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
795 0, session, L2TP_CMD_SESSION_GET);
796 if (ret < 0)
797 goto err_out;
798
799 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
800
801 err_out:
802 nlmsg_free(msg);
803
804 out:
805 return ret;
806 }
807
l2tp_nl_cmd_session_dump(struct sk_buff * skb,struct netlink_callback * cb)808 static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
809 {
810 struct net *net = sock_net(skb->sk);
811 struct l2tp_session *session;
812 struct l2tp_tunnel *tunnel = NULL;
813 int ti = cb->args[0];
814 int si = cb->args[1];
815
816 for (;;) {
817 if (tunnel == NULL) {
818 tunnel = l2tp_tunnel_find_nth(net, ti);
819 if (tunnel == NULL)
820 goto out;
821 }
822
823 session = l2tp_session_find_nth(tunnel, si);
824 if (session == NULL) {
825 ti++;
826 tunnel = NULL;
827 si = 0;
828 continue;
829 }
830
831 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
832 cb->nlh->nlmsg_seq, NLM_F_MULTI,
833 session, L2TP_CMD_SESSION_GET) < 0)
834 break;
835
836 si++;
837 }
838
839 out:
840 cb->args[0] = ti;
841 cb->args[1] = si;
842
843 return skb->len;
844 }
845
846 static struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
847 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
848 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
849 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
850 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
851 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
852 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
853 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
854 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
855 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
856 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
857 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
858 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
859 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
860 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
861 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
862 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
863 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
864 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
865 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
866 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
867 [L2TP_ATTR_FD] = { .type = NLA_U32, },
868 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
869 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
870 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
871 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
872 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
873 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
874 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
875 [L2TP_ATTR_IP6_SADDR] = {
876 .type = NLA_BINARY,
877 .len = sizeof(struct in6_addr),
878 },
879 [L2TP_ATTR_IP6_DADDR] = {
880 .type = NLA_BINARY,
881 .len = sizeof(struct in6_addr),
882 },
883 [L2TP_ATTR_IFNAME] = {
884 .type = NLA_NUL_STRING,
885 .len = IFNAMSIZ - 1,
886 },
887 [L2TP_ATTR_COOKIE] = {
888 .type = NLA_BINARY,
889 .len = 8,
890 },
891 [L2TP_ATTR_PEER_COOKIE] = {
892 .type = NLA_BINARY,
893 .len = 8,
894 },
895 };
896
897 static const struct genl_ops l2tp_nl_ops[] = {
898 {
899 .cmd = L2TP_CMD_NOOP,
900 .doit = l2tp_nl_cmd_noop,
901 .policy = l2tp_nl_policy,
902 /* can be retrieved by unprivileged users */
903 },
904 {
905 .cmd = L2TP_CMD_TUNNEL_CREATE,
906 .doit = l2tp_nl_cmd_tunnel_create,
907 .policy = l2tp_nl_policy,
908 .flags = GENL_ADMIN_PERM,
909 },
910 {
911 .cmd = L2TP_CMD_TUNNEL_DELETE,
912 .doit = l2tp_nl_cmd_tunnel_delete,
913 .policy = l2tp_nl_policy,
914 .flags = GENL_ADMIN_PERM,
915 },
916 {
917 .cmd = L2TP_CMD_TUNNEL_MODIFY,
918 .doit = l2tp_nl_cmd_tunnel_modify,
919 .policy = l2tp_nl_policy,
920 .flags = GENL_ADMIN_PERM,
921 },
922 {
923 .cmd = L2TP_CMD_TUNNEL_GET,
924 .doit = l2tp_nl_cmd_tunnel_get,
925 .dumpit = l2tp_nl_cmd_tunnel_dump,
926 .policy = l2tp_nl_policy,
927 .flags = GENL_ADMIN_PERM,
928 },
929 {
930 .cmd = L2TP_CMD_SESSION_CREATE,
931 .doit = l2tp_nl_cmd_session_create,
932 .policy = l2tp_nl_policy,
933 .flags = GENL_ADMIN_PERM,
934 },
935 {
936 .cmd = L2TP_CMD_SESSION_DELETE,
937 .doit = l2tp_nl_cmd_session_delete,
938 .policy = l2tp_nl_policy,
939 .flags = GENL_ADMIN_PERM,
940 },
941 {
942 .cmd = L2TP_CMD_SESSION_MODIFY,
943 .doit = l2tp_nl_cmd_session_modify,
944 .policy = l2tp_nl_policy,
945 .flags = GENL_ADMIN_PERM,
946 },
947 {
948 .cmd = L2TP_CMD_SESSION_GET,
949 .doit = l2tp_nl_cmd_session_get,
950 .dumpit = l2tp_nl_cmd_session_dump,
951 .policy = l2tp_nl_policy,
952 .flags = GENL_ADMIN_PERM,
953 },
954 };
955
l2tp_nl_register_ops(enum l2tp_pwtype pw_type,const struct l2tp_nl_cmd_ops * ops)956 int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
957 {
958 int ret;
959
960 ret = -EINVAL;
961 if (pw_type >= __L2TP_PWTYPE_MAX)
962 goto err;
963
964 genl_lock();
965 ret = -EBUSY;
966 if (l2tp_nl_cmd_ops[pw_type])
967 goto out;
968
969 l2tp_nl_cmd_ops[pw_type] = ops;
970 ret = 0;
971
972 out:
973 genl_unlock();
974 err:
975 return ret;
976 }
977 EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
978
l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)979 void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
980 {
981 if (pw_type < __L2TP_PWTYPE_MAX) {
982 genl_lock();
983 l2tp_nl_cmd_ops[pw_type] = NULL;
984 genl_unlock();
985 }
986 }
987 EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
988
l2tp_nl_init(void)989 static int l2tp_nl_init(void)
990 {
991 pr_info("L2TP netlink interface\n");
992 return genl_register_family_with_ops_groups(&l2tp_nl_family,
993 l2tp_nl_ops,
994 l2tp_multicast_group);
995 }
996
l2tp_nl_cleanup(void)997 static void l2tp_nl_cleanup(void)
998 {
999 genl_unregister_family(&l2tp_nl_family);
1000 }
1001
1002 module_init(l2tp_nl_init);
1003 module_exit(l2tp_nl_cleanup);
1004
1005 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1006 MODULE_DESCRIPTION("L2TP netlink");
1007 MODULE_LICENSE("GPL");
1008 MODULE_VERSION("1.0");
1009 MODULE_ALIAS_GENL_FAMILY("l2tp");
1010