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Merge branch 'for-linus-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-bionic-kernel.git] / net / l2tp / l2tp_netlink.c
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
36 static const struct genl_multicast_group l2tp_multicast_group[] = {
37 {
38 .name = L2TP_GENL_MCGROUP,
39 },
40 };
41
42 static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq,
43 int flags, struct l2tp_tunnel *tunnel, u8 cmd);
44 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq,
45 int flags, struct l2tp_session *session,
46 u8 cmd);
47
48 /* Accessed under genl lock */
49 static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
50
51 static struct l2tp_session *l2tp_nl_session_get(struct genl_info *info,
52 bool do_ref)
53 {
54 u32 tunnel_id;
55 u32 session_id;
56 char *ifname;
57 struct l2tp_tunnel *tunnel;
58 struct l2tp_session *session = NULL;
59 struct net *net = genl_info_net(info);
60
61 if (info->attrs[L2TP_ATTR_IFNAME]) {
62 ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
63 session = l2tp_session_get_by_ifname(net, ifname, do_ref);
64 } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) &&
65 (info->attrs[L2TP_ATTR_CONN_ID])) {
66 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
67 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
68 tunnel = l2tp_tunnel_find(net, tunnel_id);
69 if (tunnel)
70 session = l2tp_session_get(net, tunnel, session_id,
71 do_ref);
72 }
73
74 return session;
75 }
76
77 static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
78 {
79 struct sk_buff *msg;
80 void *hdr;
81 int ret = -ENOBUFS;
82
83 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
84 if (!msg) {
85 ret = -ENOMEM;
86 goto out;
87 }
88
89 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
90 &l2tp_nl_family, 0, L2TP_CMD_NOOP);
91 if (!hdr) {
92 ret = -EMSGSIZE;
93 goto err_out;
94 }
95
96 genlmsg_end(msg, hdr);
97
98 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
99
100 err_out:
101 nlmsg_free(msg);
102
103 out:
104 return ret;
105 }
106
107 static int l2tp_tunnel_notify(struct genl_family *family,
108 struct genl_info *info,
109 struct l2tp_tunnel *tunnel,
110 u8 cmd)
111 {
112 struct sk_buff *msg;
113 int ret;
114
115 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
116 if (!msg)
117 return -ENOMEM;
118
119 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
120 NLM_F_ACK, tunnel, cmd);
121
122 if (ret >= 0) {
123 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
124 /* We don't care if no one is listening */
125 if (ret == -ESRCH)
126 ret = 0;
127 return ret;
128 }
129
130 nlmsg_free(msg);
131
132 return ret;
133 }
134
135 static int l2tp_session_notify(struct genl_family *family,
136 struct genl_info *info,
137 struct l2tp_session *session,
138 u8 cmd)
139 {
140 struct sk_buff *msg;
141 int ret;
142
143 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
144 if (!msg)
145 return -ENOMEM;
146
147 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
148 NLM_F_ACK, session, cmd);
149
150 if (ret >= 0) {
151 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
152 /* We don't care if no one is listening */
153 if (ret == -ESRCH)
154 ret = 0;
155 return ret;
156 }
157
158 nlmsg_free(msg);
159
160 return ret;
161 }
162
163 static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
164 {
165 u32 tunnel_id;
166 u32 peer_tunnel_id;
167 int proto_version;
168 int fd;
169 int ret = 0;
170 struct l2tp_tunnel_cfg cfg = { 0, };
171 struct l2tp_tunnel *tunnel;
172 struct net *net = genl_info_net(info);
173
174 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
175 ret = -EINVAL;
176 goto out;
177 }
178 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
179
180 if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) {
181 ret = -EINVAL;
182 goto out;
183 }
184 peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]);
185
186 if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) {
187 ret = -EINVAL;
188 goto out;
189 }
190 proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]);
191
192 if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) {
193 ret = -EINVAL;
194 goto out;
195 }
196 cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]);
197
198 fd = -1;
199 if (info->attrs[L2TP_ATTR_FD]) {
200 fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
201 } else {
202 #if IS_ENABLED(CONFIG_IPV6)
203 if (info->attrs[L2TP_ATTR_IP6_SADDR] &&
204 info->attrs[L2TP_ATTR_IP6_DADDR]) {
205 cfg.local_ip6 = nla_data(
206 info->attrs[L2TP_ATTR_IP6_SADDR]);
207 cfg.peer_ip6 = nla_data(
208 info->attrs[L2TP_ATTR_IP6_DADDR]);
209 } else
210 #endif
211 if (info->attrs[L2TP_ATTR_IP_SADDR] &&
212 info->attrs[L2TP_ATTR_IP_DADDR]) {
213 cfg.local_ip.s_addr = nla_get_in_addr(
214 info->attrs[L2TP_ATTR_IP_SADDR]);
215 cfg.peer_ip.s_addr = nla_get_in_addr(
216 info->attrs[L2TP_ATTR_IP_DADDR]);
217 } else {
218 ret = -EINVAL;
219 goto out;
220 }
221 if (info->attrs[L2TP_ATTR_UDP_SPORT])
222 cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]);
223 if (info->attrs[L2TP_ATTR_UDP_DPORT])
224 cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]);
225 cfg.use_udp_checksums = nla_get_flag(
226 info->attrs[L2TP_ATTR_UDP_CSUM]);
227
228 #if IS_ENABLED(CONFIG_IPV6)
229 cfg.udp6_zero_tx_checksums = nla_get_flag(
230 info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]);
231 cfg.udp6_zero_rx_checksums = nla_get_flag(
232 info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]);
233 #endif
234 }
235
236 if (info->attrs[L2TP_ATTR_DEBUG])
237 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
238
239 tunnel = l2tp_tunnel_find(net, tunnel_id);
240 if (tunnel != NULL) {
241 ret = -EEXIST;
242 goto out;
243 }
244
245 ret = -EINVAL;
246 switch (cfg.encap) {
247 case L2TP_ENCAPTYPE_UDP:
248 case L2TP_ENCAPTYPE_IP:
249 ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
250 peer_tunnel_id, &cfg, &tunnel);
251 break;
252 }
253
254 if (ret >= 0)
255 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
256 tunnel, L2TP_CMD_TUNNEL_CREATE);
257 out:
258 return ret;
259 }
260
261 static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
262 {
263 struct l2tp_tunnel *tunnel;
264 u32 tunnel_id;
265 int ret = 0;
266 struct net *net = genl_info_net(info);
267
268 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
269 ret = -EINVAL;
270 goto out;
271 }
272 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
273
274 tunnel = l2tp_tunnel_find(net, tunnel_id);
275 if (tunnel == NULL) {
276 ret = -ENODEV;
277 goto out;
278 }
279
280 l2tp_tunnel_notify(&l2tp_nl_family, info,
281 tunnel, L2TP_CMD_TUNNEL_DELETE);
282
283 (void) l2tp_tunnel_delete(tunnel);
284
285 out:
286 return ret;
287 }
288
289 static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
290 {
291 struct l2tp_tunnel *tunnel;
292 u32 tunnel_id;
293 int ret = 0;
294 struct net *net = genl_info_net(info);
295
296 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
297 ret = -EINVAL;
298 goto out;
299 }
300 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
301
302 tunnel = l2tp_tunnel_find(net, tunnel_id);
303 if (tunnel == NULL) {
304 ret = -ENODEV;
305 goto out;
306 }
307
308 if (info->attrs[L2TP_ATTR_DEBUG])
309 tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
310
311 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
312 tunnel, L2TP_CMD_TUNNEL_MODIFY);
313
314 out:
315 return ret;
316 }
317
318 static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
319 struct l2tp_tunnel *tunnel, u8 cmd)
320 {
321 void *hdr;
322 struct nlattr *nest;
323 struct sock *sk = NULL;
324 struct inet_sock *inet;
325 #if IS_ENABLED(CONFIG_IPV6)
326 struct ipv6_pinfo *np = NULL;
327 #endif
328
329 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
330 if (!hdr)
331 return -EMSGSIZE;
332
333 if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
334 nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
335 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
336 nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) ||
337 nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
338 goto nla_put_failure;
339
340 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
341 if (nest == NULL)
342 goto nla_put_failure;
343
344 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
345 atomic_long_read(&tunnel->stats.tx_packets),
346 L2TP_ATTR_STATS_PAD) ||
347 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
348 atomic_long_read(&tunnel->stats.tx_bytes),
349 L2TP_ATTR_STATS_PAD) ||
350 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
351 atomic_long_read(&tunnel->stats.tx_errors),
352 L2TP_ATTR_STATS_PAD) ||
353 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
354 atomic_long_read(&tunnel->stats.rx_packets),
355 L2TP_ATTR_STATS_PAD) ||
356 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
357 atomic_long_read(&tunnel->stats.rx_bytes),
358 L2TP_ATTR_STATS_PAD) ||
359 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
360 atomic_long_read(&tunnel->stats.rx_seq_discards),
361 L2TP_ATTR_STATS_PAD) ||
362 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
363 atomic_long_read(&tunnel->stats.rx_oos_packets),
364 L2TP_ATTR_STATS_PAD) ||
365 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
366 atomic_long_read(&tunnel->stats.rx_errors),
367 L2TP_ATTR_STATS_PAD))
368 goto nla_put_failure;
369 nla_nest_end(skb, nest);
370
371 sk = tunnel->sock;
372 if (!sk)
373 goto out;
374
375 #if IS_ENABLED(CONFIG_IPV6)
376 if (sk->sk_family == AF_INET6)
377 np = inet6_sk(sk);
378 #endif
379
380 inet = inet_sk(sk);
381
382 switch (tunnel->encap) {
383 case L2TP_ENCAPTYPE_UDP:
384 switch (sk->sk_family) {
385 case AF_INET:
386 if (nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx))
387 goto nla_put_failure;
388 break;
389 #if IS_ENABLED(CONFIG_IPV6)
390 case AF_INET6:
391 if (udp_get_no_check6_tx(sk) &&
392 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_TX))
393 goto nla_put_failure;
394 if (udp_get_no_check6_rx(sk) &&
395 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_RX))
396 goto nla_put_failure;
397 break;
398 #endif
399 }
400 if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
401 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)))
402 goto nla_put_failure;
403 /* NOBREAK */
404 case L2TP_ENCAPTYPE_IP:
405 #if IS_ENABLED(CONFIG_IPV6)
406 if (np) {
407 if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR,
408 &np->saddr) ||
409 nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR,
410 &sk->sk_v6_daddr))
411 goto nla_put_failure;
412 } else
413 #endif
414 if (nla_put_in_addr(skb, L2TP_ATTR_IP_SADDR,
415 inet->inet_saddr) ||
416 nla_put_in_addr(skb, L2TP_ATTR_IP_DADDR,
417 inet->inet_daddr))
418 goto nla_put_failure;
419 break;
420 }
421
422 out:
423 genlmsg_end(skb, hdr);
424 return 0;
425
426 nla_put_failure:
427 genlmsg_cancel(skb, hdr);
428 return -1;
429 }
430
431 static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
432 {
433 struct l2tp_tunnel *tunnel;
434 struct sk_buff *msg;
435 u32 tunnel_id;
436 int ret = -ENOBUFS;
437 struct net *net = genl_info_net(info);
438
439 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
440 ret = -EINVAL;
441 goto out;
442 }
443
444 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
445
446 tunnel = l2tp_tunnel_find(net, tunnel_id);
447 if (tunnel == NULL) {
448 ret = -ENODEV;
449 goto out;
450 }
451
452 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
453 if (!msg) {
454 ret = -ENOMEM;
455 goto out;
456 }
457
458 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
459 NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET);
460 if (ret < 0)
461 goto err_out;
462
463 return genlmsg_unicast(net, msg, info->snd_portid);
464
465 err_out:
466 nlmsg_free(msg);
467
468 out:
469 return ret;
470 }
471
472 static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
473 {
474 int ti = cb->args[0];
475 struct l2tp_tunnel *tunnel;
476 struct net *net = sock_net(skb->sk);
477
478 for (;;) {
479 tunnel = l2tp_tunnel_find_nth(net, ti);
480 if (tunnel == NULL)
481 goto out;
482
483 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
484 cb->nlh->nlmsg_seq, NLM_F_MULTI,
485 tunnel, L2TP_CMD_TUNNEL_GET) < 0)
486 goto out;
487
488 ti++;
489 }
490
491 out:
492 cb->args[0] = ti;
493
494 return skb->len;
495 }
496
497 static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
498 {
499 u32 tunnel_id = 0;
500 u32 session_id;
501 u32 peer_session_id;
502 int ret = 0;
503 struct l2tp_tunnel *tunnel;
504 struct l2tp_session *session;
505 struct l2tp_session_cfg cfg = { 0, };
506 struct net *net = genl_info_net(info);
507
508 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
509 ret = -EINVAL;
510 goto out;
511 }
512 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
513 tunnel = l2tp_tunnel_find(net, tunnel_id);
514 if (!tunnel) {
515 ret = -ENODEV;
516 goto out;
517 }
518
519 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
520 ret = -EINVAL;
521 goto out;
522 }
523 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
524
525 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
526 ret = -EINVAL;
527 goto out;
528 }
529 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
530
531 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
532 ret = -EINVAL;
533 goto out;
534 }
535 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
536 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
537 ret = -EINVAL;
538 goto out;
539 }
540
541 if (tunnel->version > 2) {
542 if (info->attrs[L2TP_ATTR_OFFSET])
543 cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
544
545 if (info->attrs[L2TP_ATTR_DATA_SEQ])
546 cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
547
548 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
549 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
550 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
551
552 cfg.l2specific_len = 4;
553 if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
554 cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
555
556 if (info->attrs[L2TP_ATTR_COOKIE]) {
557 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
558 if (len > 8) {
559 ret = -EINVAL;
560 goto out;
561 }
562 cfg.cookie_len = len;
563 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
564 }
565 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
566 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
567 if (len > 8) {
568 ret = -EINVAL;
569 goto out;
570 }
571 cfg.peer_cookie_len = len;
572 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
573 }
574 if (info->attrs[L2TP_ATTR_IFNAME])
575 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
576
577 if (info->attrs[L2TP_ATTR_VLAN_ID])
578 cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
579 }
580
581 if (info->attrs[L2TP_ATTR_DEBUG])
582 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
583
584 if (info->attrs[L2TP_ATTR_RECV_SEQ])
585 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
586
587 if (info->attrs[L2TP_ATTR_SEND_SEQ])
588 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
589
590 if (info->attrs[L2TP_ATTR_LNS_MODE])
591 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
592
593 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
594 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
595
596 if (info->attrs[L2TP_ATTR_MTU])
597 cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
598
599 if (info->attrs[L2TP_ATTR_MRU])
600 cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
601
602 #ifdef CONFIG_MODULES
603 if (l2tp_nl_cmd_ops[cfg.pw_type] == NULL) {
604 genl_unlock();
605 request_module("net-l2tp-type-%u", cfg.pw_type);
606 genl_lock();
607 }
608 #endif
609 if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
610 (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
611 ret = -EPROTONOSUPPORT;
612 goto out;
613 }
614
615 /* Check that pseudowire-specific params are present */
616 switch (cfg.pw_type) {
617 case L2TP_PWTYPE_NONE:
618 break;
619 case L2TP_PWTYPE_ETH_VLAN:
620 if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
621 ret = -EINVAL;
622 goto out;
623 }
624 break;
625 case L2TP_PWTYPE_ETH:
626 break;
627 case L2TP_PWTYPE_PPP:
628 case L2TP_PWTYPE_PPP_AC:
629 break;
630 case L2TP_PWTYPE_IP:
631 default:
632 ret = -EPROTONOSUPPORT;
633 break;
634 }
635
636 ret = -EPROTONOSUPPORT;
637 if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create)
638 ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id,
639 session_id, peer_session_id, &cfg);
640
641 if (ret >= 0) {
642 session = l2tp_session_get(net, tunnel, session_id, false);
643 if (session) {
644 ret = l2tp_session_notify(&l2tp_nl_family, info, session,
645 L2TP_CMD_SESSION_CREATE);
646 l2tp_session_dec_refcount(session);
647 }
648 }
649
650 out:
651 return ret;
652 }
653
654 static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
655 {
656 int ret = 0;
657 struct l2tp_session *session;
658 u16 pw_type;
659
660 session = l2tp_nl_session_get(info, true);
661 if (session == NULL) {
662 ret = -ENODEV;
663 goto out;
664 }
665
666 l2tp_session_notify(&l2tp_nl_family, info,
667 session, L2TP_CMD_SESSION_DELETE);
668
669 pw_type = session->pwtype;
670 if (pw_type < __L2TP_PWTYPE_MAX)
671 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
672 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
673
674 if (session->deref)
675 session->deref(session);
676 l2tp_session_dec_refcount(session);
677
678 out:
679 return ret;
680 }
681
682 static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
683 {
684 int ret = 0;
685 struct l2tp_session *session;
686
687 session = l2tp_nl_session_get(info, false);
688 if (session == NULL) {
689 ret = -ENODEV;
690 goto out;
691 }
692
693 if (info->attrs[L2TP_ATTR_DEBUG])
694 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
695
696 if (info->attrs[L2TP_ATTR_DATA_SEQ])
697 session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
698
699 if (info->attrs[L2TP_ATTR_RECV_SEQ])
700 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
701
702 if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
703 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
704 l2tp_session_set_header_len(session, session->tunnel->version);
705 }
706
707 if (info->attrs[L2TP_ATTR_LNS_MODE])
708 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
709
710 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
711 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
712
713 if (info->attrs[L2TP_ATTR_MTU])
714 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
715
716 if (info->attrs[L2TP_ATTR_MRU])
717 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
718
719 ret = l2tp_session_notify(&l2tp_nl_family, info,
720 session, L2TP_CMD_SESSION_MODIFY);
721
722 l2tp_session_dec_refcount(session);
723
724 out:
725 return ret;
726 }
727
728 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
729 struct l2tp_session *session, u8 cmd)
730 {
731 void *hdr;
732 struct nlattr *nest;
733 struct l2tp_tunnel *tunnel = session->tunnel;
734 struct sock *sk = NULL;
735
736 sk = tunnel->sock;
737
738 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
739 if (!hdr)
740 return -EMSGSIZE;
741
742 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
743 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
744 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
745 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
746 session->peer_session_id) ||
747 nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
748 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) ||
749 nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) ||
750 (session->mru &&
751 nla_put_u16(skb, L2TP_ATTR_MRU, session->mru)))
752 goto nla_put_failure;
753
754 if ((session->ifname[0] &&
755 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
756 (session->cookie_len &&
757 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
758 &session->cookie[0])) ||
759 (session->peer_cookie_len &&
760 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
761 &session->peer_cookie[0])) ||
762 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
763 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
764 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
765 #ifdef CONFIG_XFRM
766 (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) &&
767 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
768 #endif
769 (session->reorder_timeout &&
770 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT,
771 session->reorder_timeout, L2TP_ATTR_PAD)))
772 goto nla_put_failure;
773
774 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
775 if (nest == NULL)
776 goto nla_put_failure;
777
778 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
779 atomic_long_read(&session->stats.tx_packets),
780 L2TP_ATTR_STATS_PAD) ||
781 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
782 atomic_long_read(&session->stats.tx_bytes),
783 L2TP_ATTR_STATS_PAD) ||
784 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
785 atomic_long_read(&session->stats.tx_errors),
786 L2TP_ATTR_STATS_PAD) ||
787 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
788 atomic_long_read(&session->stats.rx_packets),
789 L2TP_ATTR_STATS_PAD) ||
790 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
791 atomic_long_read(&session->stats.rx_bytes),
792 L2TP_ATTR_STATS_PAD) ||
793 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
794 atomic_long_read(&session->stats.rx_seq_discards),
795 L2TP_ATTR_STATS_PAD) ||
796 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
797 atomic_long_read(&session->stats.rx_oos_packets),
798 L2TP_ATTR_STATS_PAD) ||
799 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
800 atomic_long_read(&session->stats.rx_errors),
801 L2TP_ATTR_STATS_PAD))
802 goto nla_put_failure;
803 nla_nest_end(skb, nest);
804
805 genlmsg_end(skb, hdr);
806 return 0;
807
808 nla_put_failure:
809 genlmsg_cancel(skb, hdr);
810 return -1;
811 }
812
813 static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
814 {
815 struct l2tp_session *session;
816 struct sk_buff *msg;
817 int ret;
818
819 session = l2tp_nl_session_get(info, false);
820 if (session == NULL) {
821 ret = -ENODEV;
822 goto err;
823 }
824
825 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
826 if (!msg) {
827 ret = -ENOMEM;
828 goto err_ref;
829 }
830
831 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
832 0, session, L2TP_CMD_SESSION_GET);
833 if (ret < 0)
834 goto err_ref_msg;
835
836 ret = genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
837
838 l2tp_session_dec_refcount(session);
839
840 return ret;
841
842 err_ref_msg:
843 nlmsg_free(msg);
844 err_ref:
845 l2tp_session_dec_refcount(session);
846 err:
847 return ret;
848 }
849
850 static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
851 {
852 struct net *net = sock_net(skb->sk);
853 struct l2tp_session *session;
854 struct l2tp_tunnel *tunnel = NULL;
855 int ti = cb->args[0];
856 int si = cb->args[1];
857
858 for (;;) {
859 if (tunnel == NULL) {
860 tunnel = l2tp_tunnel_find_nth(net, ti);
861 if (tunnel == NULL)
862 goto out;
863 }
864
865 session = l2tp_session_get_nth(tunnel, si, false);
866 if (session == NULL) {
867 ti++;
868 tunnel = NULL;
869 si = 0;
870 continue;
871 }
872
873 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
874 cb->nlh->nlmsg_seq, NLM_F_MULTI,
875 session, L2TP_CMD_SESSION_GET) < 0) {
876 l2tp_session_dec_refcount(session);
877 break;
878 }
879 l2tp_session_dec_refcount(session);
880
881 si++;
882 }
883
884 out:
885 cb->args[0] = ti;
886 cb->args[1] = si;
887
888 return skb->len;
889 }
890
891 static const struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
892 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
893 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
894 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
895 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
896 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
897 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
898 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
899 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
900 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
901 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
902 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
903 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
904 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
905 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
906 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
907 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
908 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
909 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
910 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
911 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
912 [L2TP_ATTR_FD] = { .type = NLA_U32, },
913 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
914 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
915 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
916 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
917 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
918 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
919 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
920 [L2TP_ATTR_IP6_SADDR] = {
921 .type = NLA_BINARY,
922 .len = sizeof(struct in6_addr),
923 },
924 [L2TP_ATTR_IP6_DADDR] = {
925 .type = NLA_BINARY,
926 .len = sizeof(struct in6_addr),
927 },
928 [L2TP_ATTR_IFNAME] = {
929 .type = NLA_NUL_STRING,
930 .len = IFNAMSIZ - 1,
931 },
932 [L2TP_ATTR_COOKIE] = {
933 .type = NLA_BINARY,
934 .len = 8,
935 },
936 [L2TP_ATTR_PEER_COOKIE] = {
937 .type = NLA_BINARY,
938 .len = 8,
939 },
940 };
941
942 static const struct genl_ops l2tp_nl_ops[] = {
943 {
944 .cmd = L2TP_CMD_NOOP,
945 .doit = l2tp_nl_cmd_noop,
946 .policy = l2tp_nl_policy,
947 /* can be retrieved by unprivileged users */
948 },
949 {
950 .cmd = L2TP_CMD_TUNNEL_CREATE,
951 .doit = l2tp_nl_cmd_tunnel_create,
952 .policy = l2tp_nl_policy,
953 .flags = GENL_ADMIN_PERM,
954 },
955 {
956 .cmd = L2TP_CMD_TUNNEL_DELETE,
957 .doit = l2tp_nl_cmd_tunnel_delete,
958 .policy = l2tp_nl_policy,
959 .flags = GENL_ADMIN_PERM,
960 },
961 {
962 .cmd = L2TP_CMD_TUNNEL_MODIFY,
963 .doit = l2tp_nl_cmd_tunnel_modify,
964 .policy = l2tp_nl_policy,
965 .flags = GENL_ADMIN_PERM,
966 },
967 {
968 .cmd = L2TP_CMD_TUNNEL_GET,
969 .doit = l2tp_nl_cmd_tunnel_get,
970 .dumpit = l2tp_nl_cmd_tunnel_dump,
971 .policy = l2tp_nl_policy,
972 .flags = GENL_ADMIN_PERM,
973 },
974 {
975 .cmd = L2TP_CMD_SESSION_CREATE,
976 .doit = l2tp_nl_cmd_session_create,
977 .policy = l2tp_nl_policy,
978 .flags = GENL_ADMIN_PERM,
979 },
980 {
981 .cmd = L2TP_CMD_SESSION_DELETE,
982 .doit = l2tp_nl_cmd_session_delete,
983 .policy = l2tp_nl_policy,
984 .flags = GENL_ADMIN_PERM,
985 },
986 {
987 .cmd = L2TP_CMD_SESSION_MODIFY,
988 .doit = l2tp_nl_cmd_session_modify,
989 .policy = l2tp_nl_policy,
990 .flags = GENL_ADMIN_PERM,
991 },
992 {
993 .cmd = L2TP_CMD_SESSION_GET,
994 .doit = l2tp_nl_cmd_session_get,
995 .dumpit = l2tp_nl_cmd_session_dump,
996 .policy = l2tp_nl_policy,
997 .flags = GENL_ADMIN_PERM,
998 },
999 };
1000
1001 static struct genl_family l2tp_nl_family __ro_after_init = {
1002 .name = L2TP_GENL_NAME,
1003 .version = L2TP_GENL_VERSION,
1004 .hdrsize = 0,
1005 .maxattr = L2TP_ATTR_MAX,
1006 .netnsok = true,
1007 .module = THIS_MODULE,
1008 .ops = l2tp_nl_ops,
1009 .n_ops = ARRAY_SIZE(l2tp_nl_ops),
1010 .mcgrps = l2tp_multicast_group,
1011 .n_mcgrps = ARRAY_SIZE(l2tp_multicast_group),
1012 };
1013
1014 int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
1015 {
1016 int ret;
1017
1018 ret = -EINVAL;
1019 if (pw_type >= __L2TP_PWTYPE_MAX)
1020 goto err;
1021
1022 genl_lock();
1023 ret = -EBUSY;
1024 if (l2tp_nl_cmd_ops[pw_type])
1025 goto out;
1026
1027 l2tp_nl_cmd_ops[pw_type] = ops;
1028 ret = 0;
1029
1030 out:
1031 genl_unlock();
1032 err:
1033 return ret;
1034 }
1035 EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
1036
1037 void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
1038 {
1039 if (pw_type < __L2TP_PWTYPE_MAX) {
1040 genl_lock();
1041 l2tp_nl_cmd_ops[pw_type] = NULL;
1042 genl_unlock();
1043 }
1044 }
1045 EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
1046
1047 static int __init l2tp_nl_init(void)
1048 {
1049 pr_info("L2TP netlink interface\n");
1050 return genl_register_family(&l2tp_nl_family);
1051 }
1052
1053 static void l2tp_nl_cleanup(void)
1054 {
1055 genl_unregister_family(&l2tp_nl_family);
1056 }
1057
1058 module_init(l2tp_nl_init);
1059 module_exit(l2tp_nl_cleanup);
1060
1061 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1062 MODULE_DESCRIPTION("L2TP netlink");
1063 MODULE_LICENSE("GPL");
1064 MODULE_VERSION("1.0");
1065 MODULE_ALIAS_GENL_FAMILY("l2tp");
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