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dm thin: wake worker when discard is prepared
[linux-2.6.git] / net / l2tp / l2tp_netlink.c
blob6c4cc12c7414f90341513a29da3097f4c9f9ecb4
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 };
41
42 /* Accessed under genl lock */
43 static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
44
45 static struct l2tp_session *l2tp_nl_session_find(struct genl_info *info)
46 {
47 u32 tunnel_id;
48 u32 session_id;
49 char *ifname;
50 struct l2tp_tunnel *tunnel;
51 struct l2tp_session *session = NULL;
52 struct net *net = genl_info_net(info);
53
54 if (info->attrs[L2TP_ATTR_IFNAME]) {
55 ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
56 session = l2tp_session_find_by_ifname(net, ifname);
57 } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) &&
58 (info->attrs[L2TP_ATTR_CONN_ID])) {
59 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
60 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
61 tunnel = l2tp_tunnel_find(net, tunnel_id);
62 if (tunnel)
63 session = l2tp_session_find(net, tunnel, session_id);
64 }
65
66 return session;
67 }
68
69 static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
70 {
71 struct sk_buff *msg;
72 void *hdr;
73 int ret = -ENOBUFS;
74
75 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
76 if (!msg) {
77 ret = -ENOMEM;
78 goto out;
79 }
80
81 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
82 &l2tp_nl_family, 0, L2TP_CMD_NOOP);
83 if (!hdr) {
84 ret = -EMSGSIZE;
85 goto err_out;
86 }
87
88 genlmsg_end(msg, hdr);
89
90 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
91
92 err_out:
93 nlmsg_free(msg);
94
95 out:
96 return ret;
97 }
98
99 static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
100 {
101 u32 tunnel_id;
102 u32 peer_tunnel_id;
103 int proto_version;
104 int fd;
105 int ret = 0;
106 struct l2tp_tunnel_cfg cfg = { 0, };
107 struct l2tp_tunnel *tunnel;
108 struct net *net = genl_info_net(info);
109
110 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
111 ret = -EINVAL;
112 goto out;
113 }
114 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
115
116 if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) {
117 ret = -EINVAL;
118 goto out;
119 }
120 peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]);
121
122 if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) {
123 ret = -EINVAL;
124 goto out;
125 }
126 proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]);
127
128 if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) {
129 ret = -EINVAL;
130 goto out;
131 }
132 cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]);
133
134 fd = -1;
135 if (info->attrs[L2TP_ATTR_FD]) {
136 fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
137 } else {
138 #if IS_ENABLED(CONFIG_IPV6)
139 if (info->attrs[L2TP_ATTR_IP6_SADDR] &&
140 info->attrs[L2TP_ATTR_IP6_DADDR]) {
141 cfg.local_ip6 = nla_data(
142 info->attrs[L2TP_ATTR_IP6_SADDR]);
143 cfg.peer_ip6 = nla_data(
144 info->attrs[L2TP_ATTR_IP6_DADDR]);
145 } else
146 #endif
147 if (info->attrs[L2TP_ATTR_IP_SADDR] &&
148 info->attrs[L2TP_ATTR_IP_DADDR]) {
149 cfg.local_ip.s_addr = nla_get_be32(
150 info->attrs[L2TP_ATTR_IP_SADDR]);
151 cfg.peer_ip.s_addr = nla_get_be32(
152 info->attrs[L2TP_ATTR_IP_DADDR]);
153 } else {
154 ret = -EINVAL;
155 goto out;
156 }
157 if (info->attrs[L2TP_ATTR_UDP_SPORT])
158 cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]);
159 if (info->attrs[L2TP_ATTR_UDP_DPORT])
160 cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]);
161 if (info->attrs[L2TP_ATTR_UDP_CSUM])
162 cfg.use_udp_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_CSUM]);
163 }
164
165 if (info->attrs[L2TP_ATTR_DEBUG])
166 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
167
168 tunnel = l2tp_tunnel_find(net, tunnel_id);
169 if (tunnel != NULL) {
170 ret = -EEXIST;
171 goto out;
172 }
173
174 ret = -EINVAL;
175 switch (cfg.encap) {
176 case L2TP_ENCAPTYPE_UDP:
177 case L2TP_ENCAPTYPE_IP:
178 ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
179 peer_tunnel_id, &cfg, &tunnel);
180 break;
181 }
182
183 out:
184 return ret;
185 }
186
187 static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
188 {
189 struct l2tp_tunnel *tunnel;
190 u32 tunnel_id;
191 int ret = 0;
192 struct net *net = genl_info_net(info);
193
194 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
195 ret = -EINVAL;
196 goto out;
197 }
198 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
199
200 tunnel = l2tp_tunnel_find(net, tunnel_id);
201 if (tunnel == NULL) {
202 ret = -ENODEV;
203 goto out;
204 }
205
206 (void) l2tp_tunnel_delete(tunnel);
207
208 out:
209 return ret;
210 }
211
212 static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
213 {
214 struct l2tp_tunnel *tunnel;
215 u32 tunnel_id;
216 int ret = 0;
217 struct net *net = genl_info_net(info);
218
219 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
220 ret = -EINVAL;
221 goto out;
222 }
223 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
224
225 tunnel = l2tp_tunnel_find(net, tunnel_id);
226 if (tunnel == NULL) {
227 ret = -ENODEV;
228 goto out;
229 }
230
231 if (info->attrs[L2TP_ATTR_DEBUG])
232 tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
233
234 out:
235 return ret;
236 }
237
238 static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
239 struct l2tp_tunnel *tunnel)
240 {
241 void *hdr;
242 struct nlattr *nest;
243 struct sock *sk = NULL;
244 struct inet_sock *inet;
245 #if IS_ENABLED(CONFIG_IPV6)
246 struct ipv6_pinfo *np = NULL;
247 #endif
248 struct l2tp_stats stats;
249 unsigned int start;
250
251 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags,
252 L2TP_CMD_TUNNEL_GET);
253 if (!hdr)
254 return -EMSGSIZE;
255
256 if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
257 nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
258 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
259 nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) ||
260 nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
261 goto nla_put_failure;
262
263 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
264 if (nest == NULL)
265 goto nla_put_failure;
266
267 do {
268 start = u64_stats_fetch_begin(&tunnel->stats.syncp);
269 stats.tx_packets = tunnel->stats.tx_packets;
270 stats.tx_bytes = tunnel->stats.tx_bytes;
271 stats.tx_errors = tunnel->stats.tx_errors;
272 stats.rx_packets = tunnel->stats.rx_packets;
273 stats.rx_bytes = tunnel->stats.rx_bytes;
274 stats.rx_errors = tunnel->stats.rx_errors;
275 stats.rx_seq_discards = tunnel->stats.rx_seq_discards;
276 stats.rx_oos_packets = tunnel->stats.rx_oos_packets;
277 } while (u64_stats_fetch_retry(&tunnel->stats.syncp, start));
278
279 if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, stats.tx_packets) ||
280 nla_put_u64(skb, L2TP_ATTR_TX_BYTES, stats.tx_bytes) ||
281 nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, stats.tx_errors) ||
282 nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, stats.rx_packets) ||
283 nla_put_u64(skb, L2TP_ATTR_RX_BYTES, stats.rx_bytes) ||
284 nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
285 stats.rx_seq_discards) ||
286 nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS,
287 stats.rx_oos_packets) ||
288 nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, stats.rx_errors))
289 goto nla_put_failure;
290 nla_nest_end(skb, nest);
291
292 sk = tunnel->sock;
293 if (!sk)
294 goto out;
295
296 #if IS_ENABLED(CONFIG_IPV6)
297 if (sk->sk_family == AF_INET6)
298 np = inet6_sk(sk);
299 #endif
300
301 inet = inet_sk(sk);
302
303 switch (tunnel->encap) {
304 case L2TP_ENCAPTYPE_UDP:
305 if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
306 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)) ||
307 nla_put_u8(skb, L2TP_ATTR_UDP_CSUM,
308 (sk->sk_no_check != UDP_CSUM_NOXMIT)))
309 goto nla_put_failure;
310 /* NOBREAK */
311 case L2TP_ENCAPTYPE_IP:
312 #if IS_ENABLED(CONFIG_IPV6)
313 if (np) {
314 if (nla_put(skb, L2TP_ATTR_IP6_SADDR, sizeof(np->saddr),
315 &np->saddr) ||
316 nla_put(skb, L2TP_ATTR_IP6_DADDR, sizeof(np->daddr),
317 &np->daddr))
318 goto nla_put_failure;
319 } else
320 #endif
321 if (nla_put_be32(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr) ||
322 nla_put_be32(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr))
323 goto nla_put_failure;
324 break;
325 }
326
327 out:
328 return genlmsg_end(skb, hdr);
329
330 nla_put_failure:
331 genlmsg_cancel(skb, hdr);
332 return -1;
333 }
334
335 static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
336 {
337 struct l2tp_tunnel *tunnel;
338 struct sk_buff *msg;
339 u32 tunnel_id;
340 int ret = -ENOBUFS;
341 struct net *net = genl_info_net(info);
342
343 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
344 ret = -EINVAL;
345 goto out;
346 }
347
348 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
349
350 tunnel = l2tp_tunnel_find(net, tunnel_id);
351 if (tunnel == NULL) {
352 ret = -ENODEV;
353 goto out;
354 }
355
356 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
357 if (!msg) {
358 ret = -ENOMEM;
359 goto out;
360 }
361
362 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
363 NLM_F_ACK, tunnel);
364 if (ret < 0)
365 goto err_out;
366
367 return genlmsg_unicast(net, msg, info->snd_portid);
368
369 err_out:
370 nlmsg_free(msg);
371
372 out:
373 return ret;
374 }
375
376 static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
377 {
378 int ti = cb->args[0];
379 struct l2tp_tunnel *tunnel;
380 struct net *net = sock_net(skb->sk);
381
382 for (;;) {
383 tunnel = l2tp_tunnel_find_nth(net, ti);
384 if (tunnel == NULL)
385 goto out;
386
387 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
388 cb->nlh->nlmsg_seq, NLM_F_MULTI,
389 tunnel) <= 0)
390 goto out;
391
392 ti++;
393 }
394
395 out:
396 cb->args[0] = ti;
397
398 return skb->len;
399 }
400
401 static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
402 {
403 u32 tunnel_id = 0;
404 u32 session_id;
405 u32 peer_session_id;
406 int ret = 0;
407 struct l2tp_tunnel *tunnel;
408 struct l2tp_session *session;
409 struct l2tp_session_cfg cfg = { 0, };
410 struct net *net = genl_info_net(info);
411
412 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
413 ret = -EINVAL;
414 goto out;
415 }
416 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
417 tunnel = l2tp_tunnel_find(net, tunnel_id);
418 if (!tunnel) {
419 ret = -ENODEV;
420 goto out;
421 }
422
423 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
424 ret = -EINVAL;
425 goto out;
426 }
427 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
428 session = l2tp_session_find(net, tunnel, session_id);
429 if (session) {
430 ret = -EEXIST;
431 goto out;
432 }
433
434 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
435 ret = -EINVAL;
436 goto out;
437 }
438 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
439
440 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
441 ret = -EINVAL;
442 goto out;
443 }
444 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
445 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
446 ret = -EINVAL;
447 goto out;
448 }
449
450 if (tunnel->version > 2) {
451 if (info->attrs[L2TP_ATTR_OFFSET])
452 cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
453
454 if (info->attrs[L2TP_ATTR_DATA_SEQ])
455 cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
456
457 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
458 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
459 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
460
461 cfg.l2specific_len = 4;
462 if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
463 cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
464
465 if (info->attrs[L2TP_ATTR_COOKIE]) {
466 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
467 if (len > 8) {
468 ret = -EINVAL;
469 goto out;
470 }
471 cfg.cookie_len = len;
472 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
473 }
474 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
475 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
476 if (len > 8) {
477 ret = -EINVAL;
478 goto out;
479 }
480 cfg.peer_cookie_len = len;
481 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
482 }
483 if (info->attrs[L2TP_ATTR_IFNAME])
484 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
485
486 if (info->attrs[L2TP_ATTR_VLAN_ID])
487 cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
488 }
489
490 if (info->attrs[L2TP_ATTR_DEBUG])
491 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
492
493 if (info->attrs[L2TP_ATTR_RECV_SEQ])
494 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
495
496 if (info->attrs[L2TP_ATTR_SEND_SEQ])
497 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
498
499 if (info->attrs[L2TP_ATTR_LNS_MODE])
500 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
501
502 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
503 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
504
505 if (info->attrs[L2TP_ATTR_MTU])
506 cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
507
508 if (info->attrs[L2TP_ATTR_MRU])
509 cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
510
511 if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
512 (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
513 ret = -EPROTONOSUPPORT;
514 goto out;
515 }
516
517 /* Check that pseudowire-specific params are present */
518 switch (cfg.pw_type) {
519 case L2TP_PWTYPE_NONE:
520 break;
521 case L2TP_PWTYPE_ETH_VLAN:
522 if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
523 ret = -EINVAL;
524 goto out;
525 }
526 break;
527 case L2TP_PWTYPE_ETH:
528 break;
529 case L2TP_PWTYPE_PPP:
530 case L2TP_PWTYPE_PPP_AC:
531 break;
532 case L2TP_PWTYPE_IP:
533 default:
534 ret = -EPROTONOSUPPORT;
535 break;
536 }
537
538 ret = -EPROTONOSUPPORT;
539 if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create)
540 ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id,
541 session_id, peer_session_id, &cfg);
542
543 out:
544 return ret;
545 }
546
547 static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
548 {
549 int ret = 0;
550 struct l2tp_session *session;
551 u16 pw_type;
552
553 session = l2tp_nl_session_find(info);
554 if (session == NULL) {
555 ret = -ENODEV;
556 goto out;
557 }
558
559 pw_type = session->pwtype;
560 if (pw_type < __L2TP_PWTYPE_MAX)
561 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
562 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
563
564 out:
565 return ret;
566 }
567
568 static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
569 {
570 int ret = 0;
571 struct l2tp_session *session;
572
573 session = l2tp_nl_session_find(info);
574 if (session == NULL) {
575 ret = -ENODEV;
576 goto out;
577 }
578
579 if (info->attrs[L2TP_ATTR_DEBUG])
580 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
581
582 if (info->attrs[L2TP_ATTR_DATA_SEQ])
583 session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
584
585 if (info->attrs[L2TP_ATTR_RECV_SEQ])
586 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
587
588 if (info->attrs[L2TP_ATTR_SEND_SEQ])
589 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
590
591 if (info->attrs[L2TP_ATTR_LNS_MODE])
592 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
593
594 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
595 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
596
597 if (info->attrs[L2TP_ATTR_MTU])
598 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
599
600 if (info->attrs[L2TP_ATTR_MRU])
601 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
602
603 out:
604 return ret;
605 }
606
607 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
608 struct l2tp_session *session)
609 {
610 void *hdr;
611 struct nlattr *nest;
612 struct l2tp_tunnel *tunnel = session->tunnel;
613 struct sock *sk = NULL;
614 struct l2tp_stats stats;
615 unsigned int start;
616
617 sk = tunnel->sock;
618
619 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, L2TP_CMD_SESSION_GET);
620 if (!hdr)
621 return -EMSGSIZE;
622
623 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
624 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
625 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
626 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
627 session->peer_session_id) ||
628 nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
629 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) ||
630 nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) ||
631 (session->mru &&
632 nla_put_u16(skb, L2TP_ATTR_MRU, session->mru)))
633 goto nla_put_failure;
634
635 if ((session->ifname && session->ifname[0] &&
636 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
637 (session->cookie_len &&
638 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
639 &session->cookie[0])) ||
640 (session->peer_cookie_len &&
641 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
642 &session->peer_cookie[0])) ||
643 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
644 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
645 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
646 #ifdef CONFIG_XFRM
647 (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) &&
648 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
649 #endif
650 (session->reorder_timeout &&
651 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT, session->reorder_timeout)))
652 goto nla_put_failure;
653
654 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
655 if (nest == NULL)
656 goto nla_put_failure;
657
658 do {
659 start = u64_stats_fetch_begin(&session->stats.syncp);
660 stats.tx_packets = session->stats.tx_packets;
661 stats.tx_bytes = session->stats.tx_bytes;
662 stats.tx_errors = session->stats.tx_errors;
663 stats.rx_packets = session->stats.rx_packets;
664 stats.rx_bytes = session->stats.rx_bytes;
665 stats.rx_errors = session->stats.rx_errors;
666 stats.rx_seq_discards = session->stats.rx_seq_discards;
667 stats.rx_oos_packets = session->stats.rx_oos_packets;
668 } while (u64_stats_fetch_retry(&session->stats.syncp, start));
669
670 if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, stats.tx_packets) ||
671 nla_put_u64(skb, L2TP_ATTR_TX_BYTES, stats.tx_bytes) ||
672 nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, stats.tx_errors) ||
673 nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, stats.rx_packets) ||
674 nla_put_u64(skb, L2TP_ATTR_RX_BYTES, stats.rx_bytes) ||
675 nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
676 stats.rx_seq_discards) ||
677 nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS,
678 stats.rx_oos_packets) ||
679 nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, stats.rx_errors))
680 goto nla_put_failure;
681 nla_nest_end(skb, nest);
682
683 return genlmsg_end(skb, hdr);
684
685 nla_put_failure:
686 genlmsg_cancel(skb, hdr);
687 return -1;
688 }
689
690 static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
691 {
692 struct l2tp_session *session;
693 struct sk_buff *msg;
694 int ret;
695
696 session = l2tp_nl_session_find(info);
697 if (session == NULL) {
698 ret = -ENODEV;
699 goto out;
700 }
701
702 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
703 if (!msg) {
704 ret = -ENOMEM;
705 goto out;
706 }
707
708 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
709 0, session);
710 if (ret < 0)
711 goto err_out;
712
713 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
714
715 err_out:
716 nlmsg_free(msg);
717
718 out:
719 return ret;
720 }
721
722 static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
723 {
724 struct net *net = sock_net(skb->sk);
725 struct l2tp_session *session;
726 struct l2tp_tunnel *tunnel = NULL;
727 int ti = cb->args[0];
728 int si = cb->args[1];
729
730 for (;;) {
731 if (tunnel == NULL) {
732 tunnel = l2tp_tunnel_find_nth(net, ti);
733 if (tunnel == NULL)
734 goto out;
735 }
736
737 session = l2tp_session_find_nth(tunnel, si);
738 if (session == NULL) {
739 ti++;
740 tunnel = NULL;
741 si = 0;
742 continue;
743 }
744
745 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
746 cb->nlh->nlmsg_seq, NLM_F_MULTI,
747 session) <= 0)
748 break;
749
750 si++;
751 }
752
753 out:
754 cb->args[0] = ti;
755 cb->args[1] = si;
756
757 return skb->len;
758 }
759
760 static struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
761 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
762 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
763 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
764 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
765 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
766 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
767 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
768 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
769 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
770 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
771 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
772 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
773 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
774 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
775 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
776 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
777 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
778 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
779 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
780 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
781 [L2TP_ATTR_FD] = { .type = NLA_U32, },
782 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
783 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
784 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
785 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
786 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
787 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
788 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
789 [L2TP_ATTR_IP6_SADDR] = {
790 .type = NLA_BINARY,
791 .len = sizeof(struct in6_addr),
792 },
793 [L2TP_ATTR_IP6_DADDR] = {
794 .type = NLA_BINARY,
795 .len = sizeof(struct in6_addr),
796 },
797 [L2TP_ATTR_IFNAME] = {
798 .type = NLA_NUL_STRING,
799 .len = IFNAMSIZ - 1,
800 },
801 [L2TP_ATTR_COOKIE] = {
802 .type = NLA_BINARY,
803 .len = 8,
804 },
805 [L2TP_ATTR_PEER_COOKIE] = {
806 .type = NLA_BINARY,
807 .len = 8,
808 },
809 };
810
811 static struct genl_ops l2tp_nl_ops[] = {
812 {
813 .cmd = L2TP_CMD_NOOP,
814 .doit = l2tp_nl_cmd_noop,
815 .policy = l2tp_nl_policy,
816 /* can be retrieved by unprivileged users */
817 },
818 {
819 .cmd = L2TP_CMD_TUNNEL_CREATE,
820 .doit = l2tp_nl_cmd_tunnel_create,
821 .policy = l2tp_nl_policy,
822 .flags = GENL_ADMIN_PERM,
823 },
824 {
825 .cmd = L2TP_CMD_TUNNEL_DELETE,
826 .doit = l2tp_nl_cmd_tunnel_delete,
827 .policy = l2tp_nl_policy,
828 .flags = GENL_ADMIN_PERM,
829 },
830 {
831 .cmd = L2TP_CMD_TUNNEL_MODIFY,
832 .doit = l2tp_nl_cmd_tunnel_modify,
833 .policy = l2tp_nl_policy,
834 .flags = GENL_ADMIN_PERM,
835 },
836 {
837 .cmd = L2TP_CMD_TUNNEL_GET,
838 .doit = l2tp_nl_cmd_tunnel_get,
839 .dumpit = l2tp_nl_cmd_tunnel_dump,
840 .policy = l2tp_nl_policy,
841 .flags = GENL_ADMIN_PERM,
842 },
843 {
844 .cmd = L2TP_CMD_SESSION_CREATE,
845 .doit = l2tp_nl_cmd_session_create,
846 .policy = l2tp_nl_policy,
847 .flags = GENL_ADMIN_PERM,
848 },
849 {
850 .cmd = L2TP_CMD_SESSION_DELETE,
851 .doit = l2tp_nl_cmd_session_delete,
852 .policy = l2tp_nl_policy,
853 .flags = GENL_ADMIN_PERM,
854 },
855 {
856 .cmd = L2TP_CMD_SESSION_MODIFY,
857 .doit = l2tp_nl_cmd_session_modify,
858 .policy = l2tp_nl_policy,
859 .flags = GENL_ADMIN_PERM,
860 },
861 {
862 .cmd = L2TP_CMD_SESSION_GET,
863 .doit = l2tp_nl_cmd_session_get,
864 .dumpit = l2tp_nl_cmd_session_dump,
865 .policy = l2tp_nl_policy,
866 .flags = GENL_ADMIN_PERM,
867 },
868 };
869
870 int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
871 {
872 int ret;
873
874 ret = -EINVAL;
875 if (pw_type >= __L2TP_PWTYPE_MAX)
876 goto err;
877
878 genl_lock();
879 ret = -EBUSY;
880 if (l2tp_nl_cmd_ops[pw_type])
881 goto out;
882
883 l2tp_nl_cmd_ops[pw_type] = ops;
884 ret = 0;
885
886 out:
887 genl_unlock();
888 err:
889 return ret;
890 }
891 EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
892
893 void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
894 {
895 if (pw_type < __L2TP_PWTYPE_MAX) {
896 genl_lock();
897 l2tp_nl_cmd_ops[pw_type] = NULL;
898 genl_unlock();
899 }
900 }
901 EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
902
903 static int l2tp_nl_init(void)
904 {
905 int err;
906
907 pr_info("L2TP netlink interface\n");
908 err = genl_register_family_with_ops(&l2tp_nl_family, l2tp_nl_ops,
909 ARRAY_SIZE(l2tp_nl_ops));
910
911 return err;
912 }
913
914 static void l2tp_nl_cleanup(void)
915 {
916 genl_unregister_family(&l2tp_nl_family);
917 }
918
919 module_init(l2tp_nl_init);
920 module_exit(l2tp_nl_cleanup);
921
922 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
923 MODULE_DESCRIPTION("L2TP netlink");
924 MODULE_LICENSE("GPL");
925 MODULE_VERSION("1.0");
926 MODULE_ALIAS_GENL_FAMILY("l2tp");
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