?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
l2tp: avoid deadlock in l2tp stats update
[linux/fpc-iii.git] / net / l2tp / l2tp_netlink.c
blob0825ff26e113f3e2acdbbe2b88bd0f4fbfd92410
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 /* Accessed under genl lock */
44 static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
45
46 static struct l2tp_session *l2tp_nl_session_find(struct genl_info *info)
47 {
48 u32 tunnel_id;
49 u32 session_id;
50 char *ifname;
51 struct l2tp_tunnel *tunnel;
52 struct l2tp_session *session = NULL;
53 struct net *net = genl_info_net(info);
54
55 if (info->attrs[L2TP_ATTR_IFNAME]) {
56 ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
57 session = l2tp_session_find_by_ifname(net, ifname);
58 } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) &&
59 (info->attrs[L2TP_ATTR_CONN_ID])) {
60 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
61 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
62 tunnel = l2tp_tunnel_find(net, tunnel_id);
63 if (tunnel)
64 session = l2tp_session_find(net, tunnel, session_id);
65 }
66
67 return session;
68 }
69
70 static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
71 {
72 struct sk_buff *msg;
73 void *hdr;
74 int ret = -ENOBUFS;
75
76 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
77 if (!msg) {
78 ret = -ENOMEM;
79 goto out;
80 }
81
82 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
83 &l2tp_nl_family, 0, L2TP_CMD_NOOP);
84 if (!hdr) {
85 ret = -EMSGSIZE;
86 goto err_out;
87 }
88
89 genlmsg_end(msg, hdr);
90
91 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
92
93 err_out:
94 nlmsg_free(msg);
95
96 out:
97 return ret;
98 }
99
100 static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
101 {
102 u32 tunnel_id;
103 u32 peer_tunnel_id;
104 int proto_version;
105 int fd;
106 int ret = 0;
107 struct l2tp_tunnel_cfg cfg = { 0, };
108 struct l2tp_tunnel *tunnel;
109 struct net *net = genl_info_net(info);
110
111 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
112 ret = -EINVAL;
113 goto out;
114 }
115 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
116
117 if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) {
118 ret = -EINVAL;
119 goto out;
120 }
121 peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]);
122
123 if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) {
124 ret = -EINVAL;
125 goto out;
126 }
127 proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]);
128
129 if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) {
130 ret = -EINVAL;
131 goto out;
132 }
133 cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]);
134
135 fd = -1;
136 if (info->attrs[L2TP_ATTR_FD]) {
137 fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
138 } else {
139 #if IS_ENABLED(CONFIG_IPV6)
140 if (info->attrs[L2TP_ATTR_IP6_SADDR] &&
141 info->attrs[L2TP_ATTR_IP6_DADDR]) {
142 cfg.local_ip6 = nla_data(
143 info->attrs[L2TP_ATTR_IP6_SADDR]);
144 cfg.peer_ip6 = nla_data(
145 info->attrs[L2TP_ATTR_IP6_DADDR]);
146 } else
147 #endif
148 if (info->attrs[L2TP_ATTR_IP_SADDR] &&
149 info->attrs[L2TP_ATTR_IP_DADDR]) {
150 cfg.local_ip.s_addr = nla_get_be32(
151 info->attrs[L2TP_ATTR_IP_SADDR]);
152 cfg.peer_ip.s_addr = nla_get_be32(
153 info->attrs[L2TP_ATTR_IP_DADDR]);
154 } else {
155 ret = -EINVAL;
156 goto out;
157 }
158 if (info->attrs[L2TP_ATTR_UDP_SPORT])
159 cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]);
160 if (info->attrs[L2TP_ATTR_UDP_DPORT])
161 cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]);
162 if (info->attrs[L2TP_ATTR_UDP_CSUM])
163 cfg.use_udp_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_CSUM]);
164 }
165
166 if (info->attrs[L2TP_ATTR_DEBUG])
167 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
168
169 tunnel = l2tp_tunnel_find(net, tunnel_id);
170 if (tunnel != NULL) {
171 ret = -EEXIST;
172 goto out;
173 }
174
175 ret = -EINVAL;
176 switch (cfg.encap) {
177 case L2TP_ENCAPTYPE_UDP:
178 case L2TP_ENCAPTYPE_IP:
179 ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
180 peer_tunnel_id, &cfg, &tunnel);
181 break;
182 }
183
184 out:
185 return ret;
186 }
187
188 static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
189 {
190 struct l2tp_tunnel *tunnel;
191 u32 tunnel_id;
192 int ret = 0;
193 struct net *net = genl_info_net(info);
194
195 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
196 ret = -EINVAL;
197 goto out;
198 }
199 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
200
201 tunnel = l2tp_tunnel_find(net, tunnel_id);
202 if (tunnel == NULL) {
203 ret = -ENODEV;
204 goto out;
205 }
206
207 (void) l2tp_tunnel_delete(tunnel);
208
209 out:
210 return ret;
211 }
212
213 static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
214 {
215 struct l2tp_tunnel *tunnel;
216 u32 tunnel_id;
217 int ret = 0;
218 struct net *net = genl_info_net(info);
219
220 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
221 ret = -EINVAL;
222 goto out;
223 }
224 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
225
226 tunnel = l2tp_tunnel_find(net, tunnel_id);
227 if (tunnel == NULL) {
228 ret = -ENODEV;
229 goto out;
230 }
231
232 if (info->attrs[L2TP_ATTR_DEBUG])
233 tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
234
235 out:
236 return ret;
237 }
238
239 static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
240 struct l2tp_tunnel *tunnel)
241 {
242 void *hdr;
243 struct nlattr *nest;
244 struct sock *sk = NULL;
245 struct inet_sock *inet;
246 #if IS_ENABLED(CONFIG_IPV6)
247 struct ipv6_pinfo *np = NULL;
248 #endif
249
250 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags,
251 L2TP_CMD_TUNNEL_GET);
252 if (!hdr)
253 return -EMSGSIZE;
254
255 if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
256 nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
257 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
258 nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) ||
259 nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
260 goto nla_put_failure;
261
262 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
263 if (nest == NULL)
264 goto nla_put_failure;
265
266 if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS,
267 atomic_long_read(&tunnel->stats.tx_packets)) ||
268 nla_put_u64(skb, L2TP_ATTR_TX_BYTES,
269 atomic_long_read(&tunnel->stats.tx_bytes)) ||
270 nla_put_u64(skb, L2TP_ATTR_TX_ERRORS,
271 atomic_long_read(&tunnel->stats.tx_errors)) ||
272 nla_put_u64(skb, L2TP_ATTR_RX_PACKETS,
273 atomic_long_read(&tunnel->stats.rx_packets)) ||
274 nla_put_u64(skb, L2TP_ATTR_RX_BYTES,
275 atomic_long_read(&tunnel->stats.rx_bytes)) ||
276 nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
277 atomic_long_read(&tunnel->stats.rx_seq_discards)) ||
278 nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS,
279 atomic_long_read(&tunnel->stats.rx_oos_packets)) ||
280 nla_put_u64(skb, L2TP_ATTR_RX_ERRORS,
281 atomic_long_read(&tunnel->stats.rx_errors)))
282 goto nla_put_failure;
283 nla_nest_end(skb, nest);
284
285 sk = tunnel->sock;
286 if (!sk)
287 goto out;
288
289 #if IS_ENABLED(CONFIG_IPV6)
290 if (sk->sk_family == AF_INET6)
291 np = inet6_sk(sk);
292 #endif
293
294 inet = inet_sk(sk);
295
296 switch (tunnel->encap) {
297 case L2TP_ENCAPTYPE_UDP:
298 if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
299 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)) ||
300 nla_put_u8(skb, L2TP_ATTR_UDP_CSUM,
301 (sk->sk_no_check != UDP_CSUM_NOXMIT)))
302 goto nla_put_failure;
303 /* NOBREAK */
304 case L2TP_ENCAPTYPE_IP:
305 #if IS_ENABLED(CONFIG_IPV6)
306 if (np) {
307 if (nla_put(skb, L2TP_ATTR_IP6_SADDR, sizeof(np->saddr),
308 &np->saddr) ||
309 nla_put(skb, L2TP_ATTR_IP6_DADDR, sizeof(np->daddr),
310 &np->daddr))
311 goto nla_put_failure;
312 } else
313 #endif
314 if (nla_put_be32(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr) ||
315 nla_put_be32(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr))
316 goto nla_put_failure;
317 break;
318 }
319
320 out:
321 return genlmsg_end(skb, hdr);
322
323 nla_put_failure:
324 genlmsg_cancel(skb, hdr);
325 return -1;
326 }
327
328 static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
329 {
330 struct l2tp_tunnel *tunnel;
331 struct sk_buff *msg;
332 u32 tunnel_id;
333 int ret = -ENOBUFS;
334 struct net *net = genl_info_net(info);
335
336 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
337 ret = -EINVAL;
338 goto out;
339 }
340
341 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
342
343 tunnel = l2tp_tunnel_find(net, tunnel_id);
344 if (tunnel == NULL) {
345 ret = -ENODEV;
346 goto out;
347 }
348
349 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
350 if (!msg) {
351 ret = -ENOMEM;
352 goto out;
353 }
354
355 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
356 NLM_F_ACK, tunnel);
357 if (ret < 0)
358 goto err_out;
359
360 return genlmsg_unicast(net, msg, info->snd_portid);
361
362 err_out:
363 nlmsg_free(msg);
364
365 out:
366 return ret;
367 }
368
369 static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
370 {
371 int ti = cb->args[0];
372 struct l2tp_tunnel *tunnel;
373 struct net *net = sock_net(skb->sk);
374
375 for (;;) {
376 tunnel = l2tp_tunnel_find_nth(net, ti);
377 if (tunnel == NULL)
378 goto out;
379
380 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
381 cb->nlh->nlmsg_seq, NLM_F_MULTI,
382 tunnel) <= 0)
383 goto out;
384
385 ti++;
386 }
387
388 out:
389 cb->args[0] = ti;
390
391 return skb->len;
392 }
393
394 static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
395 {
396 u32 tunnel_id = 0;
397 u32 session_id;
398 u32 peer_session_id;
399 int ret = 0;
400 struct l2tp_tunnel *tunnel;
401 struct l2tp_session *session;
402 struct l2tp_session_cfg cfg = { 0, };
403 struct net *net = genl_info_net(info);
404
405 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
406 ret = -EINVAL;
407 goto out;
408 }
409 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
410 tunnel = l2tp_tunnel_find(net, tunnel_id);
411 if (!tunnel) {
412 ret = -ENODEV;
413 goto out;
414 }
415
416 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
417 ret = -EINVAL;
418 goto out;
419 }
420 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
421 session = l2tp_session_find(net, tunnel, session_id);
422 if (session) {
423 ret = -EEXIST;
424 goto out;
425 }
426
427 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
428 ret = -EINVAL;
429 goto out;
430 }
431 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
432
433 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
434 ret = -EINVAL;
435 goto out;
436 }
437 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
438 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
439 ret = -EINVAL;
440 goto out;
441 }
442
443 if (tunnel->version > 2) {
444 if (info->attrs[L2TP_ATTR_OFFSET])
445 cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
446
447 if (info->attrs[L2TP_ATTR_DATA_SEQ])
448 cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
449
450 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
451 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
452 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
453
454 cfg.l2specific_len = 4;
455 if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
456 cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
457
458 if (info->attrs[L2TP_ATTR_COOKIE]) {
459 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
460 if (len > 8) {
461 ret = -EINVAL;
462 goto out;
463 }
464 cfg.cookie_len = len;
465 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
466 }
467 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
468 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
469 if (len > 8) {
470 ret = -EINVAL;
471 goto out;
472 }
473 cfg.peer_cookie_len = len;
474 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
475 }
476 if (info->attrs[L2TP_ATTR_IFNAME])
477 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
478
479 if (info->attrs[L2TP_ATTR_VLAN_ID])
480 cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
481 }
482
483 if (info->attrs[L2TP_ATTR_DEBUG])
484 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
485
486 if (info->attrs[L2TP_ATTR_RECV_SEQ])
487 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
488
489 if (info->attrs[L2TP_ATTR_SEND_SEQ])
490 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
491
492 if (info->attrs[L2TP_ATTR_LNS_MODE])
493 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
494
495 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
496 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
497
498 if (info->attrs[L2TP_ATTR_MTU])
499 cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
500
501 if (info->attrs[L2TP_ATTR_MRU])
502 cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
503
504 if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
505 (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
506 ret = -EPROTONOSUPPORT;
507 goto out;
508 }
509
510 /* Check that pseudowire-specific params are present */
511 switch (cfg.pw_type) {
512 case L2TP_PWTYPE_NONE:
513 break;
514 case L2TP_PWTYPE_ETH_VLAN:
515 if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
516 ret = -EINVAL;
517 goto out;
518 }
519 break;
520 case L2TP_PWTYPE_ETH:
521 break;
522 case L2TP_PWTYPE_PPP:
523 case L2TP_PWTYPE_PPP_AC:
524 break;
525 case L2TP_PWTYPE_IP:
526 default:
527 ret = -EPROTONOSUPPORT;
528 break;
529 }
530
531 ret = -EPROTONOSUPPORT;
532 if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create)
533 ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id,
534 session_id, peer_session_id, &cfg);
535
536 out:
537 return ret;
538 }
539
540 static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
541 {
542 int ret = 0;
543 struct l2tp_session *session;
544 u16 pw_type;
545
546 session = l2tp_nl_session_find(info);
547 if (session == NULL) {
548 ret = -ENODEV;
549 goto out;
550 }
551
552 pw_type = session->pwtype;
553 if (pw_type < __L2TP_PWTYPE_MAX)
554 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
555 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
556
557 out:
558 return ret;
559 }
560
561 static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
562 {
563 int ret = 0;
564 struct l2tp_session *session;
565
566 session = l2tp_nl_session_find(info);
567 if (session == NULL) {
568 ret = -ENODEV;
569 goto out;
570 }
571
572 if (info->attrs[L2TP_ATTR_DEBUG])
573 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
574
575 if (info->attrs[L2TP_ATTR_DATA_SEQ])
576 session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
577
578 if (info->attrs[L2TP_ATTR_RECV_SEQ])
579 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
580
581 if (info->attrs[L2TP_ATTR_SEND_SEQ])
582 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
583
584 if (info->attrs[L2TP_ATTR_LNS_MODE])
585 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
586
587 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
588 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
589
590 if (info->attrs[L2TP_ATTR_MTU])
591 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
592
593 if (info->attrs[L2TP_ATTR_MRU])
594 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
595
596 out:
597 return ret;
598 }
599
600 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
601 struct l2tp_session *session)
602 {
603 void *hdr;
604 struct nlattr *nest;
605 struct l2tp_tunnel *tunnel = session->tunnel;
606 struct sock *sk = NULL;
607
608 sk = tunnel->sock;
609
610 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, L2TP_CMD_SESSION_GET);
611 if (!hdr)
612 return -EMSGSIZE;
613
614 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
615 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
616 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
617 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
618 session->peer_session_id) ||
619 nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
620 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) ||
621 nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) ||
622 (session->mru &&
623 nla_put_u16(skb, L2TP_ATTR_MRU, session->mru)))
624 goto nla_put_failure;
625
626 if ((session->ifname[0] &&
627 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
628 (session->cookie_len &&
629 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
630 &session->cookie[0])) ||
631 (session->peer_cookie_len &&
632 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
633 &session->peer_cookie[0])) ||
634 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
635 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
636 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
637 #ifdef CONFIG_XFRM
638 (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) &&
639 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
640 #endif
641 (session->reorder_timeout &&
642 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT, session->reorder_timeout)))
643 goto nla_put_failure;
644
645 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
646 if (nest == NULL)
647 goto nla_put_failure;
648
649 if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS,
650 atomic_long_read(&session->stats.tx_packets)) ||
651 nla_put_u64(skb, L2TP_ATTR_TX_BYTES,
652 atomic_long_read(&session->stats.tx_bytes)) ||
653 nla_put_u64(skb, L2TP_ATTR_TX_ERRORS,
654 atomic_long_read(&session->stats.tx_errors)) ||
655 nla_put_u64(skb, L2TP_ATTR_RX_PACKETS,
656 atomic_long_read(&session->stats.rx_packets)) ||
657 nla_put_u64(skb, L2TP_ATTR_RX_BYTES,
658 atomic_long_read(&session->stats.rx_bytes)) ||
659 nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
660 atomic_long_read(&session->stats.rx_seq_discards)) ||
661 nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS,
662 atomic_long_read(&session->stats.rx_oos_packets)) ||
663 nla_put_u64(skb, L2TP_ATTR_RX_ERRORS,
664 atomic_long_read(&session->stats.rx_errors)))
665 goto nla_put_failure;
666 nla_nest_end(skb, nest);
667
668 return genlmsg_end(skb, hdr);
669
670 nla_put_failure:
671 genlmsg_cancel(skb, hdr);
672 return -1;
673 }
674
675 static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
676 {
677 struct l2tp_session *session;
678 struct sk_buff *msg;
679 int ret;
680
681 session = l2tp_nl_session_find(info);
682 if (session == NULL) {
683 ret = -ENODEV;
684 goto out;
685 }
686
687 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
688 if (!msg) {
689 ret = -ENOMEM;
690 goto out;
691 }
692
693 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
694 0, session);
695 if (ret < 0)
696 goto err_out;
697
698 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
699
700 err_out:
701 nlmsg_free(msg);
702
703 out:
704 return ret;
705 }
706
707 static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
708 {
709 struct net *net = sock_net(skb->sk);
710 struct l2tp_session *session;
711 struct l2tp_tunnel *tunnel = NULL;
712 int ti = cb->args[0];
713 int si = cb->args[1];
714
715 for (;;) {
716 if (tunnel == NULL) {
717 tunnel = l2tp_tunnel_find_nth(net, ti);
718 if (tunnel == NULL)
719 goto out;
720 }
721
722 session = l2tp_session_find_nth(tunnel, si);
723 if (session == NULL) {
724 ti++;
725 tunnel = NULL;
726 si = 0;
727 continue;
728 }
729
730 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
731 cb->nlh->nlmsg_seq, NLM_F_MULTI,
732 session) <= 0)
733 break;
734
735 si++;
736 }
737
738 out:
739 cb->args[0] = ti;
740 cb->args[1] = si;
741
742 return skb->len;
743 }
744
745 static struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
746 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
747 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
748 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
749 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
750 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
751 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
752 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
753 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
754 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
755 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
756 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
757 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
758 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
759 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
760 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
761 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
762 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
763 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
764 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
765 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
766 [L2TP_ATTR_FD] = { .type = NLA_U32, },
767 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
768 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
769 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
770 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
771 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
772 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
773 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
774 [L2TP_ATTR_IP6_SADDR] = {
775 .type = NLA_BINARY,
776 .len = sizeof(struct in6_addr),
777 },
778 [L2TP_ATTR_IP6_DADDR] = {
779 .type = NLA_BINARY,
780 .len = sizeof(struct in6_addr),
781 },
782 [L2TP_ATTR_IFNAME] = {
783 .type = NLA_NUL_STRING,
784 .len = IFNAMSIZ - 1,
785 },
786 [L2TP_ATTR_COOKIE] = {
787 .type = NLA_BINARY,
788 .len = 8,
789 },
790 [L2TP_ATTR_PEER_COOKIE] = {
791 .type = NLA_BINARY,
792 .len = 8,
793 },
794 };
795
796 static struct genl_ops l2tp_nl_ops[] = {
797 {
798 .cmd = L2TP_CMD_NOOP,
799 .doit = l2tp_nl_cmd_noop,
800 .policy = l2tp_nl_policy,
801 /* can be retrieved by unprivileged users */
802 },
803 {
804 .cmd = L2TP_CMD_TUNNEL_CREATE,
805 .doit = l2tp_nl_cmd_tunnel_create,
806 .policy = l2tp_nl_policy,
807 .flags = GENL_ADMIN_PERM,
808 },
809 {
810 .cmd = L2TP_CMD_TUNNEL_DELETE,
811 .doit = l2tp_nl_cmd_tunnel_delete,
812 .policy = l2tp_nl_policy,
813 .flags = GENL_ADMIN_PERM,
814 },
815 {
816 .cmd = L2TP_CMD_TUNNEL_MODIFY,
817 .doit = l2tp_nl_cmd_tunnel_modify,
818 .policy = l2tp_nl_policy,
819 .flags = GENL_ADMIN_PERM,
820 },
821 {
822 .cmd = L2TP_CMD_TUNNEL_GET,
823 .doit = l2tp_nl_cmd_tunnel_get,
824 .dumpit = l2tp_nl_cmd_tunnel_dump,
825 .policy = l2tp_nl_policy,
826 .flags = GENL_ADMIN_PERM,
827 },
828 {
829 .cmd = L2TP_CMD_SESSION_CREATE,
830 .doit = l2tp_nl_cmd_session_create,
831 .policy = l2tp_nl_policy,
832 .flags = GENL_ADMIN_PERM,
833 },
834 {
835 .cmd = L2TP_CMD_SESSION_DELETE,
836 .doit = l2tp_nl_cmd_session_delete,
837 .policy = l2tp_nl_policy,
838 .flags = GENL_ADMIN_PERM,
839 },
840 {
841 .cmd = L2TP_CMD_SESSION_MODIFY,
842 .doit = l2tp_nl_cmd_session_modify,
843 .policy = l2tp_nl_policy,
844 .flags = GENL_ADMIN_PERM,
845 },
846 {
847 .cmd = L2TP_CMD_SESSION_GET,
848 .doit = l2tp_nl_cmd_session_get,
849 .dumpit = l2tp_nl_cmd_session_dump,
850 .policy = l2tp_nl_policy,
851 .flags = GENL_ADMIN_PERM,
852 },
853 };
854
855 int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
856 {
857 int ret;
858
859 ret = -EINVAL;
860 if (pw_type >= __L2TP_PWTYPE_MAX)
861 goto err;
862
863 genl_lock();
864 ret = -EBUSY;
865 if (l2tp_nl_cmd_ops[pw_type])
866 goto out;
867
868 l2tp_nl_cmd_ops[pw_type] = ops;
869 ret = 0;
870
871 out:
872 genl_unlock();
873 err:
874 return ret;
875 }
876 EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
877
878 void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
879 {
880 if (pw_type < __L2TP_PWTYPE_MAX) {
881 genl_lock();
882 l2tp_nl_cmd_ops[pw_type] = NULL;
883 genl_unlock();
884 }
885 }
886 EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
887
888 static int l2tp_nl_init(void)
889 {
890 int err;
891
892 pr_info("L2TP netlink interface\n");
893 err = genl_register_family_with_ops(&l2tp_nl_family, l2tp_nl_ops,
894 ARRAY_SIZE(l2tp_nl_ops));
895
896 return err;
897 }
898
899 static void l2tp_nl_cleanup(void)
900 {
901 genl_unregister_family(&l2tp_nl_family);
902 }
903
904 module_init(l2tp_nl_init);
905 module_exit(l2tp_nl_cleanup);
906
907 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
908 MODULE_DESCRIPTION("L2TP netlink");
909 MODULE_LICENSE("GPL");
910 MODULE_VERSION("1.0");
911 MODULE_ALIAS_GENL_FAMILY("l2tp");
Linux with added FPC-III support