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scsi: ufs: fix race between clock gating and devfreq scaling work
[linux/fpc-iii.git] / net / l2tp / l2tp_netlink.c
blobd6fccfdca2011928614069e90bd6240f44d6d02b
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
58 static struct l2tp_session *l2tp_nl_session_get(struct genl_info *info,
59 bool do_ref)
60 {
61 u32 tunnel_id;
62 u32 session_id;
63 char *ifname;
64 struct l2tp_tunnel *tunnel;
65 struct l2tp_session *session = NULL;
66 struct net *net = genl_info_net(info);
67
68 if (info->attrs[L2TP_ATTR_IFNAME]) {
69 ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
70 session = l2tp_session_get_by_ifname(net, ifname, do_ref);
71 } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) &&
72 (info->attrs[L2TP_ATTR_CONN_ID])) {
73 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
74 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
75 tunnel = l2tp_tunnel_find(net, tunnel_id);
76 if (tunnel)
77 session = l2tp_session_get(net, tunnel, session_id,
78 do_ref);
79 }
80
81 return session;
82 }
83
84 static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
85 {
86 struct sk_buff *msg;
87 void *hdr;
88 int ret = -ENOBUFS;
89
90 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
91 if (!msg) {
92 ret = -ENOMEM;
93 goto out;
94 }
95
96 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
97 &l2tp_nl_family, 0, L2TP_CMD_NOOP);
98 if (!hdr) {
99 ret = -EMSGSIZE;
100 goto err_out;
101 }
102
103 genlmsg_end(msg, hdr);
104
105 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
106
107 err_out:
108 nlmsg_free(msg);
109
110 out:
111 return ret;
112 }
113
114 static int l2tp_tunnel_notify(struct genl_family *family,
115 struct genl_info *info,
116 struct l2tp_tunnel *tunnel,
117 u8 cmd)
118 {
119 struct sk_buff *msg;
120 int ret;
121
122 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
123 if (!msg)
124 return -ENOMEM;
125
126 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
127 NLM_F_ACK, tunnel, cmd);
128
129 if (ret >= 0) {
130 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
131 /* We don't care if no one is listening */
132 if (ret == -ESRCH)
133 ret = 0;
134 return ret;
135 }
136
137 nlmsg_free(msg);
138
139 return ret;
140 }
141
142 static int l2tp_session_notify(struct genl_family *family,
143 struct genl_info *info,
144 struct l2tp_session *session,
145 u8 cmd)
146 {
147 struct sk_buff *msg;
148 int ret;
149
150 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
151 if (!msg)
152 return -ENOMEM;
153
154 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
155 NLM_F_ACK, session, cmd);
156
157 if (ret >= 0) {
158 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
159 /* We don't care if no one is listening */
160 if (ret == -ESRCH)
161 ret = 0;
162 return ret;
163 }
164
165 nlmsg_free(msg);
166
167 return ret;
168 }
169
170 static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
171 {
172 u32 tunnel_id;
173 u32 peer_tunnel_id;
174 int proto_version;
175 int fd;
176 int ret = 0;
177 struct l2tp_tunnel_cfg cfg = { 0, };
178 struct l2tp_tunnel *tunnel;
179 struct net *net = genl_info_net(info);
180
181 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
182 ret = -EINVAL;
183 goto out;
184 }
185 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
186
187 if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) {
188 ret = -EINVAL;
189 goto out;
190 }
191 peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]);
192
193 if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) {
194 ret = -EINVAL;
195 goto out;
196 }
197 proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]);
198
199 if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) {
200 ret = -EINVAL;
201 goto out;
202 }
203 cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]);
204
205 fd = -1;
206 if (info->attrs[L2TP_ATTR_FD]) {
207 fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
208 } else {
209 #if IS_ENABLED(CONFIG_IPV6)
210 if (info->attrs[L2TP_ATTR_IP6_SADDR] &&
211 info->attrs[L2TP_ATTR_IP6_DADDR]) {
212 cfg.local_ip6 = nla_data(
213 info->attrs[L2TP_ATTR_IP6_SADDR]);
214 cfg.peer_ip6 = nla_data(
215 info->attrs[L2TP_ATTR_IP6_DADDR]);
216 } else
217 #endif
218 if (info->attrs[L2TP_ATTR_IP_SADDR] &&
219 info->attrs[L2TP_ATTR_IP_DADDR]) {
220 cfg.local_ip.s_addr = nla_get_in_addr(
221 info->attrs[L2TP_ATTR_IP_SADDR]);
222 cfg.peer_ip.s_addr = nla_get_in_addr(
223 info->attrs[L2TP_ATTR_IP_DADDR]);
224 } else {
225 ret = -EINVAL;
226 goto out;
227 }
228 if (info->attrs[L2TP_ATTR_UDP_SPORT])
229 cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]);
230 if (info->attrs[L2TP_ATTR_UDP_DPORT])
231 cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]);
232 if (info->attrs[L2TP_ATTR_UDP_CSUM])
233 cfg.use_udp_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_CSUM]);
234
235 #if IS_ENABLED(CONFIG_IPV6)
236 if (info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX])
237 cfg.udp6_zero_tx_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]);
238 if (info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX])
239 cfg.udp6_zero_rx_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]);
240 #endif
241 }
242
243 if (info->attrs[L2TP_ATTR_DEBUG])
244 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
245
246 tunnel = l2tp_tunnel_find(net, tunnel_id);
247 if (tunnel != NULL) {
248 ret = -EEXIST;
249 goto out;
250 }
251
252 ret = -EINVAL;
253 switch (cfg.encap) {
254 case L2TP_ENCAPTYPE_UDP:
255 case L2TP_ENCAPTYPE_IP:
256 ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
257 peer_tunnel_id, &cfg, &tunnel);
258 break;
259 }
260
261 if (ret >= 0)
262 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
263 tunnel, L2TP_CMD_TUNNEL_CREATE);
264 out:
265 return ret;
266 }
267
268 static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
269 {
270 struct l2tp_tunnel *tunnel;
271 u32 tunnel_id;
272 int ret = 0;
273 struct net *net = genl_info_net(info);
274
275 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
276 ret = -EINVAL;
277 goto out;
278 }
279 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
280
281 tunnel = l2tp_tunnel_find(net, tunnel_id);
282 if (tunnel == NULL) {
283 ret = -ENODEV;
284 goto out;
285 }
286
287 l2tp_tunnel_notify(&l2tp_nl_family, info,
288 tunnel, L2TP_CMD_TUNNEL_DELETE);
289
290 l2tp_tunnel_delete(tunnel);
291
292 out:
293 return ret;
294 }
295
296 static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
297 {
298 struct l2tp_tunnel *tunnel;
299 u32 tunnel_id;
300 int ret = 0;
301 struct net *net = genl_info_net(info);
302
303 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
304 ret = -EINVAL;
305 goto out;
306 }
307 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
308
309 tunnel = l2tp_tunnel_find(net, tunnel_id);
310 if (tunnel == NULL) {
311 ret = -ENODEV;
312 goto out;
313 }
314
315 if (info->attrs[L2TP_ATTR_DEBUG])
316 tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
317
318 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
319 tunnel, L2TP_CMD_TUNNEL_MODIFY);
320
321 out:
322 return ret;
323 }
324
325 static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
326 struct l2tp_tunnel *tunnel, u8 cmd)
327 {
328 void *hdr;
329 struct nlattr *nest;
330 struct sock *sk = NULL;
331 struct inet_sock *inet;
332 #if IS_ENABLED(CONFIG_IPV6)
333 struct ipv6_pinfo *np = NULL;
334 #endif
335
336 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
337 if (!hdr)
338 return -EMSGSIZE;
339
340 if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
341 nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
342 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
343 nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) ||
344 nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
345 goto nla_put_failure;
346
347 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
348 if (nest == NULL)
349 goto nla_put_failure;
350
351 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
352 atomic_long_read(&tunnel->stats.tx_packets),
353 L2TP_ATTR_STATS_PAD) ||
354 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
355 atomic_long_read(&tunnel->stats.tx_bytes),
356 L2TP_ATTR_STATS_PAD) ||
357 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
358 atomic_long_read(&tunnel->stats.tx_errors),
359 L2TP_ATTR_STATS_PAD) ||
360 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
361 atomic_long_read(&tunnel->stats.rx_packets),
362 L2TP_ATTR_STATS_PAD) ||
363 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
364 atomic_long_read(&tunnel->stats.rx_bytes),
365 L2TP_ATTR_STATS_PAD) ||
366 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
367 atomic_long_read(&tunnel->stats.rx_seq_discards),
368 L2TP_ATTR_STATS_PAD) ||
369 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
370 atomic_long_read(&tunnel->stats.rx_oos_packets),
371 L2TP_ATTR_STATS_PAD) ||
372 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
373 atomic_long_read(&tunnel->stats.rx_errors),
374 L2TP_ATTR_STATS_PAD))
375 goto nla_put_failure;
376 nla_nest_end(skb, nest);
377
378 sk = tunnel->sock;
379 if (!sk)
380 goto out;
381
382 #if IS_ENABLED(CONFIG_IPV6)
383 if (sk->sk_family == AF_INET6)
384 np = inet6_sk(sk);
385 #endif
386
387 inet = inet_sk(sk);
388
389 switch (tunnel->encap) {
390 case L2TP_ENCAPTYPE_UDP:
391 if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
392 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)) ||
393 nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx))
394 goto nla_put_failure;
395 /* NOBREAK */
396 case L2TP_ENCAPTYPE_IP:
397 #if IS_ENABLED(CONFIG_IPV6)
398 if (np) {
399 if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR,
400 &np->saddr) ||
401 nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR,
402 &sk->sk_v6_daddr))
403 goto nla_put_failure;
404 } else
405 #endif
406 if (nla_put_in_addr(skb, L2TP_ATTR_IP_SADDR,
407 inet->inet_saddr) ||
408 nla_put_in_addr(skb, L2TP_ATTR_IP_DADDR,
409 inet->inet_daddr))
410 goto nla_put_failure;
411 break;
412 }
413
414 out:
415 genlmsg_end(skb, hdr);
416 return 0;
417
418 nla_put_failure:
419 genlmsg_cancel(skb, hdr);
420 return -1;
421 }
422
423 static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
424 {
425 struct l2tp_tunnel *tunnel;
426 struct sk_buff *msg;
427 u32 tunnel_id;
428 int ret = -ENOBUFS;
429 struct net *net = genl_info_net(info);
430
431 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
432 ret = -EINVAL;
433 goto out;
434 }
435
436 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
437
438 tunnel = l2tp_tunnel_find(net, tunnel_id);
439 if (tunnel == NULL) {
440 ret = -ENODEV;
441 goto out;
442 }
443
444 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
445 if (!msg) {
446 ret = -ENOMEM;
447 goto out;
448 }
449
450 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
451 NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET);
452 if (ret < 0)
453 goto err_out;
454
455 return genlmsg_unicast(net, msg, info->snd_portid);
456
457 err_out:
458 nlmsg_free(msg);
459
460 out:
461 return ret;
462 }
463
464 static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
465 {
466 int ti = cb->args[0];
467 struct l2tp_tunnel *tunnel;
468 struct net *net = sock_net(skb->sk);
469
470 for (;;) {
471 tunnel = l2tp_tunnel_find_nth(net, ti);
472 if (tunnel == NULL)
473 goto out;
474
475 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
476 cb->nlh->nlmsg_seq, NLM_F_MULTI,
477 tunnel, L2TP_CMD_TUNNEL_GET) < 0)
478 goto out;
479
480 ti++;
481 }
482
483 out:
484 cb->args[0] = ti;
485
486 return skb->len;
487 }
488
489 static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
490 {
491 u32 tunnel_id = 0;
492 u32 session_id;
493 u32 peer_session_id;
494 int ret = 0;
495 struct l2tp_tunnel *tunnel;
496 struct l2tp_session *session;
497 struct l2tp_session_cfg cfg = { 0, };
498 struct net *net = genl_info_net(info);
499
500 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
501 ret = -EINVAL;
502 goto out;
503 }
504 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
505 tunnel = l2tp_tunnel_find(net, tunnel_id);
506 if (!tunnel) {
507 ret = -ENODEV;
508 goto out;
509 }
510
511 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
512 ret = -EINVAL;
513 goto out;
514 }
515 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
516 session = l2tp_session_find(net, tunnel, session_id);
517 if (session) {
518 ret = -EEXIST;
519 goto out;
520 }
521
522 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
523 ret = -EINVAL;
524 goto out;
525 }
526 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
527
528 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
529 ret = -EINVAL;
530 goto out;
531 }
532 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
533 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
534 ret = -EINVAL;
535 goto out;
536 }
537
538 if (tunnel->version > 2) {
539 if (info->attrs[L2TP_ATTR_DATA_SEQ])
540 cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
541
542 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
543 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
544 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
545
546 cfg.l2specific_len = 4;
547 if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
548 cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
549
550 if (info->attrs[L2TP_ATTR_COOKIE]) {
551 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
552 if (len > 8) {
553 ret = -EINVAL;
554 goto out;
555 }
556 cfg.cookie_len = len;
557 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
558 }
559 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
560 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
561 if (len > 8) {
562 ret = -EINVAL;
563 goto out;
564 }
565 cfg.peer_cookie_len = len;
566 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
567 }
568 if (info->attrs[L2TP_ATTR_IFNAME])
569 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
570
571 if (info->attrs[L2TP_ATTR_VLAN_ID])
572 cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
573 }
574
575 if (info->attrs[L2TP_ATTR_DEBUG])
576 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
577
578 if (info->attrs[L2TP_ATTR_RECV_SEQ])
579 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
580
581 if (info->attrs[L2TP_ATTR_SEND_SEQ])
582 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
583
584 if (info->attrs[L2TP_ATTR_LNS_MODE])
585 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
586
587 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
588 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
589
590 if (info->attrs[L2TP_ATTR_MTU])
591 cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
592
593 if (info->attrs[L2TP_ATTR_MRU])
594 cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
595
596 #ifdef CONFIG_MODULES
597 if (l2tp_nl_cmd_ops[cfg.pw_type] == NULL) {
598 genl_unlock();
599 request_module("net-l2tp-type-%u", cfg.pw_type);
600 genl_lock();
601 }
602 #endif
603 if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
604 (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
605 ret = -EPROTONOSUPPORT;
606 goto out;
607 }
608
609 /* Check that pseudowire-specific params are present */
610 switch (cfg.pw_type) {
611 case L2TP_PWTYPE_NONE:
612 break;
613 case L2TP_PWTYPE_ETH_VLAN:
614 if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
615 ret = -EINVAL;
616 goto out;
617 }
618 break;
619 case L2TP_PWTYPE_ETH:
620 break;
621 case L2TP_PWTYPE_PPP:
622 case L2TP_PWTYPE_PPP_AC:
623 break;
624 case L2TP_PWTYPE_IP:
625 default:
626 ret = -EPROTONOSUPPORT;
627 break;
628 }
629
630 ret = -EPROTONOSUPPORT;
631 if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create)
632 ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id,
633 session_id, peer_session_id, &cfg);
634
635 if (ret >= 0) {
636 session = l2tp_session_get(net, tunnel, session_id, false);
637 if (session) {
638 ret = l2tp_session_notify(&l2tp_nl_family, info, session,
639 L2TP_CMD_SESSION_CREATE);
640 l2tp_session_dec_refcount(session);
641 }
642 }
643
644 out:
645 return ret;
646 }
647
648 static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
649 {
650 int ret = 0;
651 struct l2tp_session *session;
652 u16 pw_type;
653
654 session = l2tp_nl_session_get(info, true);
655 if (session == NULL) {
656 ret = -ENODEV;
657 goto out;
658 }
659
660 l2tp_session_notify(&l2tp_nl_family, info,
661 session, L2TP_CMD_SESSION_DELETE);
662
663 pw_type = session->pwtype;
664 if (pw_type < __L2TP_PWTYPE_MAX)
665 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
666 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
667
668 if (session->deref)
669 session->deref(session);
670 l2tp_session_dec_refcount(session);
671
672 out:
673 return ret;
674 }
675
676 static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
677 {
678 int ret = 0;
679 struct l2tp_session *session;
680
681 session = l2tp_nl_session_get(info, false);
682 if (session == NULL) {
683 ret = -ENODEV;
684 goto out;
685 }
686
687 if (info->attrs[L2TP_ATTR_DEBUG])
688 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
689
690 if (info->attrs[L2TP_ATTR_DATA_SEQ])
691 session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
692
693 if (info->attrs[L2TP_ATTR_RECV_SEQ])
694 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
695
696 if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
697 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
698 l2tp_session_set_header_len(session, session->tunnel->version);
699 }
700
701 if (info->attrs[L2TP_ATTR_LNS_MODE])
702 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
703
704 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
705 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
706
707 if (info->attrs[L2TP_ATTR_MTU])
708 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
709
710 if (info->attrs[L2TP_ATTR_MRU])
711 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
712
713 ret = l2tp_session_notify(&l2tp_nl_family, info,
714 session, L2TP_CMD_SESSION_MODIFY);
715
716 l2tp_session_dec_refcount(session);
717
718 out:
719 return ret;
720 }
721
722 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
723 struct l2tp_session *session, u8 cmd)
724 {
725 void *hdr;
726 struct nlattr *nest;
727 struct l2tp_tunnel *tunnel = session->tunnel;
728 struct sock *sk = NULL;
729
730 sk = tunnel->sock;
731
732 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
733 if (!hdr)
734 return -EMSGSIZE;
735
736 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
737 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
738 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
739 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
740 session->peer_session_id) ||
741 nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
742 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) ||
743 nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) ||
744 (session->mru &&
745 nla_put_u16(skb, L2TP_ATTR_MRU, session->mru)))
746 goto nla_put_failure;
747
748 if ((session->ifname[0] &&
749 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
750 (session->cookie_len &&
751 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
752 &session->cookie[0])) ||
753 (session->peer_cookie_len &&
754 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
755 &session->peer_cookie[0])) ||
756 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
757 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
758 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
759 #ifdef CONFIG_XFRM
760 (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) &&
761 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
762 #endif
763 (session->reorder_timeout &&
764 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT,
765 session->reorder_timeout, L2TP_ATTR_PAD)))
766 goto nla_put_failure;
767
768 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
769 if (nest == NULL)
770 goto nla_put_failure;
771
772 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
773 atomic_long_read(&session->stats.tx_packets),
774 L2TP_ATTR_STATS_PAD) ||
775 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
776 atomic_long_read(&session->stats.tx_bytes),
777 L2TP_ATTR_STATS_PAD) ||
778 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
779 atomic_long_read(&session->stats.tx_errors),
780 L2TP_ATTR_STATS_PAD) ||
781 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
782 atomic_long_read(&session->stats.rx_packets),
783 L2TP_ATTR_STATS_PAD) ||
784 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
785 atomic_long_read(&session->stats.rx_bytes),
786 L2TP_ATTR_STATS_PAD) ||
787 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
788 atomic_long_read(&session->stats.rx_seq_discards),
789 L2TP_ATTR_STATS_PAD) ||
790 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
791 atomic_long_read(&session->stats.rx_oos_packets),
792 L2TP_ATTR_STATS_PAD) ||
793 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
794 atomic_long_read(&session->stats.rx_errors),
795 L2TP_ATTR_STATS_PAD))
796 goto nla_put_failure;
797 nla_nest_end(skb, nest);
798
799 genlmsg_end(skb, hdr);
800 return 0;
801
802 nla_put_failure:
803 genlmsg_cancel(skb, hdr);
804 return -1;
805 }
806
807 static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
808 {
809 struct l2tp_session *session;
810 struct sk_buff *msg;
811 int ret;
812
813 session = l2tp_nl_session_get(info, false);
814 if (session == NULL) {
815 ret = -ENODEV;
816 goto err;
817 }
818
819 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
820 if (!msg) {
821 ret = -ENOMEM;
822 goto err_ref;
823 }
824
825 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
826 0, session, L2TP_CMD_SESSION_GET);
827 if (ret < 0)
828 goto err_ref_msg;
829
830 ret = genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
831
832 l2tp_session_dec_refcount(session);
833
834 return ret;
835
836 err_ref_msg:
837 nlmsg_free(msg);
838 err_ref:
839 l2tp_session_dec_refcount(session);
840 err:
841 return ret;
842 }
843
844 static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
845 {
846 struct net *net = sock_net(skb->sk);
847 struct l2tp_session *session;
848 struct l2tp_tunnel *tunnel = NULL;
849 int ti = cb->args[0];
850 int si = cb->args[1];
851
852 for (;;) {
853 if (tunnel == NULL) {
854 tunnel = l2tp_tunnel_find_nth(net, ti);
855 if (tunnel == NULL)
856 goto out;
857 }
858
859 session = l2tp_session_get_nth(tunnel, si, false);
860 if (session == NULL) {
861 ti++;
862 tunnel = NULL;
863 si = 0;
864 continue;
865 }
866
867 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
868 cb->nlh->nlmsg_seq, NLM_F_MULTI,
869 session, L2TP_CMD_SESSION_GET) < 0) {
870 l2tp_session_dec_refcount(session);
871 break;
872 }
873 l2tp_session_dec_refcount(session);
874
875 si++;
876 }
877
878 out:
879 cb->args[0] = ti;
880 cb->args[1] = si;
881
882 return skb->len;
883 }
884
885 static const struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
886 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
887 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
888 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
889 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
890 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
891 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
892 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
893 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
894 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
895 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
896 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
897 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
898 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
899 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
900 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
901 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
902 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
903 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
904 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
905 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
906 [L2TP_ATTR_FD] = { .type = NLA_U32, },
907 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
908 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
909 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
910 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
911 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
912 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
913 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
914 [L2TP_ATTR_IP6_SADDR] = {
915 .type = NLA_BINARY,
916 .len = sizeof(struct in6_addr),
917 },
918 [L2TP_ATTR_IP6_DADDR] = {
919 .type = NLA_BINARY,
920 .len = sizeof(struct in6_addr),
921 },
922 [L2TP_ATTR_IFNAME] = {
923 .type = NLA_NUL_STRING,
924 .len = IFNAMSIZ - 1,
925 },
926 [L2TP_ATTR_COOKIE] = {
927 .type = NLA_BINARY,
928 .len = 8,
929 },
930 [L2TP_ATTR_PEER_COOKIE] = {
931 .type = NLA_BINARY,
932 .len = 8,
933 },
934 };
935
936 static const struct genl_ops l2tp_nl_ops[] = {
937 {
938 .cmd = L2TP_CMD_NOOP,
939 .doit = l2tp_nl_cmd_noop,
940 .policy = l2tp_nl_policy,
941 /* can be retrieved by unprivileged users */
942 },
943 {
944 .cmd = L2TP_CMD_TUNNEL_CREATE,
945 .doit = l2tp_nl_cmd_tunnel_create,
946 .policy = l2tp_nl_policy,
947 .flags = GENL_ADMIN_PERM,
948 },
949 {
950 .cmd = L2TP_CMD_TUNNEL_DELETE,
951 .doit = l2tp_nl_cmd_tunnel_delete,
952 .policy = l2tp_nl_policy,
953 .flags = GENL_ADMIN_PERM,
954 },
955 {
956 .cmd = L2TP_CMD_TUNNEL_MODIFY,
957 .doit = l2tp_nl_cmd_tunnel_modify,
958 .policy = l2tp_nl_policy,
959 .flags = GENL_ADMIN_PERM,
960 },
961 {
962 .cmd = L2TP_CMD_TUNNEL_GET,
963 .doit = l2tp_nl_cmd_tunnel_get,
964 .dumpit = l2tp_nl_cmd_tunnel_dump,
965 .policy = l2tp_nl_policy,
966 .flags = GENL_ADMIN_PERM,
967 },
968 {
969 .cmd = L2TP_CMD_SESSION_CREATE,
970 .doit = l2tp_nl_cmd_session_create,
971 .policy = l2tp_nl_policy,
972 .flags = GENL_ADMIN_PERM,
973 },
974 {
975 .cmd = L2TP_CMD_SESSION_DELETE,
976 .doit = l2tp_nl_cmd_session_delete,
977 .policy = l2tp_nl_policy,
978 .flags = GENL_ADMIN_PERM,
979 },
980 {
981 .cmd = L2TP_CMD_SESSION_MODIFY,
982 .doit = l2tp_nl_cmd_session_modify,
983 .policy = l2tp_nl_policy,
984 .flags = GENL_ADMIN_PERM,
985 },
986 {
987 .cmd = L2TP_CMD_SESSION_GET,
988 .doit = l2tp_nl_cmd_session_get,
989 .dumpit = l2tp_nl_cmd_session_dump,
990 .policy = l2tp_nl_policy,
991 .flags = GENL_ADMIN_PERM,
992 },
993 };
994
995 int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
996 {
997 int ret;
998
999 ret = -EINVAL;
1000 if (pw_type >= __L2TP_PWTYPE_MAX)
1001 goto err;
1002
1003 genl_lock();
1004 ret = -EBUSY;
1005 if (l2tp_nl_cmd_ops[pw_type])
1006 goto out;
1007
1008 l2tp_nl_cmd_ops[pw_type] = ops;
1009 ret = 0;
1010
1011 out:
1012 genl_unlock();
1013 err:
1014 return ret;
1015 }
1016 EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
1017
1018 void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
1019 {
1020 if (pw_type < __L2TP_PWTYPE_MAX) {
1021 genl_lock();
1022 l2tp_nl_cmd_ops[pw_type] = NULL;
1023 genl_unlock();
1024 }
1025 }
1026 EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
1027
1028 static int l2tp_nl_init(void)
1029 {
1030 pr_info("L2TP netlink interface\n");
1031 return genl_register_family_with_ops_groups(&l2tp_nl_family,
1032 l2tp_nl_ops,
1033 l2tp_multicast_group);
1034 }
1035
1036 static void l2tp_nl_cleanup(void)
1037 {
1038 genl_unregister_family(&l2tp_nl_family);
1039 }
1040
1041 module_init(l2tp_nl_init);
1042 module_exit(l2tp_nl_cleanup);
1043
1044 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1045 MODULE_DESCRIPTION("L2TP netlink");
1046 MODULE_LICENSE("GPL");
1047 MODULE_VERSION("1.0");
1048 MODULE_ALIAS_GENL_FAMILY("l2tp");
Linux with added FPC-III support