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Diffstat (limited to 'net/l2tp/l2tp_netlink.c')
-rw-r--r--net/l2tp/l2tp_netlink.c830
1 files changed, 830 insertions, 0 deletions
diff --git a/net/l2tp/l2tp_netlink.c b/net/l2tp/l2tp_netlink.c
new file mode 100644
index 000000000000..3d0f7f6f7488
--- /dev/null
+++ b/net/l2tp/l2tp_netlink.c
@@ -0,0 +1,830 @@
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#include <net/sock.h>
18#include <net/genetlink.h>
19#include <net/udp.h>
20#include <linux/in.h>
21#include <linux/udp.h>
22#include <linux/socket.h>
23#include <linux/module.h>
24#include <linux/list.h>
25#include <net/net_namespace.h>
26
27#include <linux/l2tp.h>
28
29#include "l2tp_core.h"
30
31
32static struct genl_family l2tp_nl_family = {
33 .id = GENL_ID_GENERATE,
34 .name = L2TP_GENL_NAME,
35 .version = L2TP_GENL_VERSION,
36 .hdrsize = 0,
37 .maxattr = L2TP_ATTR_MAX,
38};
39
40/* Accessed under genl lock */
41static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
42
43static struct l2tp_session *l2tp_nl_session_find(struct genl_info *info)
44{
45 u32 tunnel_id;
46 u32 session_id;
47 char *ifname;
48 struct l2tp_tunnel *tunnel;
49 struct l2tp_session *session = NULL;
50 struct net *net = genl_info_net(info);
51
52 if (info->attrs[L2TP_ATTR_IFNAME]) {
53 ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
54 session = l2tp_session_find_by_ifname(net, ifname);
55 } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) &&
56 (info->attrs[L2TP_ATTR_CONN_ID])) {
57 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
58 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
59 tunnel = l2tp_tunnel_find(net, tunnel_id);
60 if (tunnel)
61 session = l2tp_session_find(net, tunnel, session_id);
62 }
63
64 return session;
65}
66
67static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
68{
69 struct sk_buff *msg;
70 void *hdr;
71 int ret = -ENOBUFS;
72
73 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
74 if (!msg) {
75 ret = -ENOMEM;
76 goto out;
77 }
78
79 hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq,
80 &l2tp_nl_family, 0, L2TP_CMD_NOOP);
81 if (IS_ERR(hdr)) {
82 ret = PTR_ERR(hdr);
83 goto err_out;
84 }
85
86 genlmsg_end(msg, hdr);
87
88 return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
89
90err_out:
91 nlmsg_free(msg);
92
93out:
94 return ret;
95}
96
97static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
98{
99 u32 tunnel_id;
100 u32 peer_tunnel_id;
101 int proto_version;
102 int fd;
103 int ret = 0;
104 struct l2tp_tunnel_cfg cfg = { 0, };
105 struct l2tp_tunnel *tunnel;
106 struct net *net = genl_info_net(info);
107
108 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
109 ret = -EINVAL;
110 goto out;
111 }
112 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
113
114 if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) {
115 ret = -EINVAL;
116 goto out;
117 }
118 peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]);
119
120 if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) {
121 ret = -EINVAL;
122 goto out;
123 }
124 proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]);
125
126 if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) {
127 ret = -EINVAL;
128 goto out;
129 }
130 cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]);
131
132 if (!info->attrs[L2TP_ATTR_FD]) {
133 ret = -EINVAL;
134 goto out;
135 }
136 fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
137
138 if (info->attrs[L2TP_ATTR_DEBUG])
139 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
140
141 tunnel = l2tp_tunnel_find(net, tunnel_id);
142 if (tunnel != NULL) {
143 ret = -EEXIST;
144 goto out;
145 }
146
147 ret = -EINVAL;
148 switch (cfg.encap) {
149 case L2TP_ENCAPTYPE_UDP:
150 case L2TP_ENCAPTYPE_IP:
151 ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
152 peer_tunnel_id, &cfg, &tunnel);
153 break;
154 }
155
156out:
157 return ret;
158}
159
160static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
161{
162 struct l2tp_tunnel *tunnel;
163 u32 tunnel_id;
164 int ret = 0;
165 struct net *net = genl_info_net(info);
166
167 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
168 ret = -EINVAL;
169 goto out;
170 }
171 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
172
173 tunnel = l2tp_tunnel_find(net, tunnel_id);
174 if (tunnel == NULL) {
175 ret = -ENODEV;
176 goto out;
177 }
178
179 (void) l2tp_tunnel_delete(tunnel);
180
181out:
182 return ret;
183}
184
185static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
186{
187 struct l2tp_tunnel *tunnel;
188 u32 tunnel_id;
189 int ret = 0;
190 struct net *net = genl_info_net(info);
191
192 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
193 ret = -EINVAL;
194 goto out;
195 }
196 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
197
198 tunnel = l2tp_tunnel_find(net, tunnel_id);
199 if (tunnel == NULL) {
200 ret = -ENODEV;
201 goto out;
202 }
203
204 if (info->attrs[L2TP_ATTR_DEBUG])
205 tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
206
207out:
208 return ret;
209}
210
211static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 pid, u32 seq, int flags,
212 struct l2tp_tunnel *tunnel)
213{
214 void *hdr;
215 struct nlattr *nest;
216 struct sock *sk = NULL;
217 struct inet_sock *inet;
218
219 hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags,
220 L2TP_CMD_TUNNEL_GET);
221 if (IS_ERR(hdr))
222 return PTR_ERR(hdr);
223
224 NLA_PUT_U8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version);
225 NLA_PUT_U32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id);
226 NLA_PUT_U32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id);
227 NLA_PUT_U32(skb, L2TP_ATTR_DEBUG, tunnel->debug);
228 NLA_PUT_U16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap);
229
230 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
231 if (nest == NULL)
232 goto nla_put_failure;
233
234 NLA_PUT_U64(skb, L2TP_ATTR_TX_PACKETS, tunnel->stats.tx_packets);
235 NLA_PUT_U64(skb, L2TP_ATTR_TX_BYTES, tunnel->stats.tx_bytes);
236 NLA_PUT_U64(skb, L2TP_ATTR_TX_ERRORS, tunnel->stats.tx_errors);
237 NLA_PUT_U64(skb, L2TP_ATTR_RX_PACKETS, tunnel->stats.rx_packets);
238 NLA_PUT_U64(skb, L2TP_ATTR_RX_BYTES, tunnel->stats.rx_bytes);
239 NLA_PUT_U64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, tunnel->stats.rx_seq_discards);
240 NLA_PUT_U64(skb, L2TP_ATTR_RX_OOS_PACKETS, tunnel->stats.rx_oos_packets);
241 NLA_PUT_U64(skb, L2TP_ATTR_RX_ERRORS, tunnel->stats.rx_errors);
242 nla_nest_end(skb, nest);
243
244 sk = tunnel->sock;
245 if (!sk)
246 goto out;
247
248 inet = inet_sk(sk);
249
250 switch (tunnel->encap) {
251 case L2TP_ENCAPTYPE_UDP:
252 NLA_PUT_U16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport));
253 NLA_PUT_U16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport));
254 NLA_PUT_U8(skb, L2TP_ATTR_UDP_CSUM, (sk->sk_no_check != UDP_CSUM_NOXMIT));
255 /* NOBREAK */
256 case L2TP_ENCAPTYPE_IP:
257 NLA_PUT_BE32(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr);
258 NLA_PUT_BE32(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr);
259 break;
260 }
261
262out:
263 return genlmsg_end(skb, hdr);
264
265nla_put_failure:
266 genlmsg_cancel(skb, hdr);
267 return -1;
268}
269
270static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
271{
272 struct l2tp_tunnel *tunnel;
273 struct sk_buff *msg;
274 u32 tunnel_id;
275 int ret = -ENOBUFS;
276 struct net *net = genl_info_net(info);
277
278 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
279 ret = -EINVAL;
280 goto out;
281 }
282
283 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
284
285 tunnel = l2tp_tunnel_find(net, tunnel_id);
286 if (tunnel == NULL) {
287 ret = -ENODEV;
288 goto out;
289 }
290
291 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
292 if (!msg) {
293 ret = -ENOMEM;
294 goto out;
295 }
296
297 ret = l2tp_nl_tunnel_send(msg, info->snd_pid, info->snd_seq,
298 NLM_F_ACK, tunnel);
299 if (ret < 0)
300 goto err_out;
301
302 return genlmsg_unicast(net, msg, info->snd_pid);
303
304err_out:
305 nlmsg_free(msg);
306
307out:
308 return ret;
309}
310
311static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
312{
313 int ti = cb->args[0];
314 struct l2tp_tunnel *tunnel;
315 struct net *net = sock_net(skb->sk);
316
317 for (;;) {
318 tunnel = l2tp_tunnel_find_nth(net, ti);
319 if (tunnel == NULL)
320 goto out;
321
322 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).pid,
323 cb->nlh->nlmsg_seq, NLM_F_MULTI,
324 tunnel) <= 0)
325 goto out;
326
327 ti++;
328 }
329
330out:
331 cb->args[0] = ti;
332
333 return skb->len;
334}
335
336static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
337{
338 u32 tunnel_id = 0;
339 u32 session_id;
340 u32 peer_session_id;
341 int ret = 0;
342 struct l2tp_tunnel *tunnel;
343 struct l2tp_session *session;
344 struct l2tp_session_cfg cfg = { 0, };
345 struct net *net = genl_info_net(info);
346
347 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
348 ret = -EINVAL;
349 goto out;
350 }
351 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
352 tunnel = l2tp_tunnel_find(net, tunnel_id);
353 if (!tunnel) {
354 ret = -ENODEV;
355 goto out;
356 }
357
358 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
359 ret = -EINVAL;
360 goto out;
361 }
362 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
363 session = l2tp_session_find(net, tunnel, session_id);
364 if (session) {
365 ret = -EEXIST;
366 goto out;
367 }
368
369 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
370 ret = -EINVAL;
371 goto out;
372 }
373 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
374
375 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
376 ret = -EINVAL;
377 goto out;
378 }
379 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
380 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
381 ret = -EINVAL;
382 goto out;
383 }
384
385 if (tunnel->version > 2) {
386 if (info->attrs[L2TP_ATTR_OFFSET])
387 cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
388
389 if (info->attrs[L2TP_ATTR_DATA_SEQ])
390 cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
391
392 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
393 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
394 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
395
396 cfg.l2specific_len = 4;
397 if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
398 cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
399
400 if (info->attrs[L2TP_ATTR_COOKIE]) {
401 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
402 if (len > 8) {
403 ret = -EINVAL;
404 goto out;
405 }
406 cfg.cookie_len = len;
407 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
408 }
409 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
410 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
411 if (len > 8) {
412 ret = -EINVAL;
413 goto out;
414 }
415 cfg.peer_cookie_len = len;
416 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
417 }
418 if (info->attrs[L2TP_ATTR_IFNAME])
419 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
420
421 if (info->attrs[L2TP_ATTR_VLAN_ID])
422 cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
423 }
424
425 if (info->attrs[L2TP_ATTR_DEBUG])
426 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
427
428 if (info->attrs[L2TP_ATTR_RECV_SEQ])
429 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
430
431 if (info->attrs[L2TP_ATTR_SEND_SEQ])
432 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
433
434 if (info->attrs[L2TP_ATTR_LNS_MODE])
435 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
436
437 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
438 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
439
440 if (info->attrs[L2TP_ATTR_MTU])
441 cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
442
443 if (info->attrs[L2TP_ATTR_MRU])
444 cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
445
446 if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
447 (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
448 ret = -EPROTONOSUPPORT;
449 goto out;
450 }
451
452 /* Check that pseudowire-specific params are present */
453 switch (cfg.pw_type) {
454 case L2TP_PWTYPE_NONE:
455 break;
456 case L2TP_PWTYPE_ETH_VLAN:
457 if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
458 ret = -EINVAL;
459 goto out;
460 }
461 break;
462 case L2TP_PWTYPE_ETH:
463 break;
464 case L2TP_PWTYPE_PPP:
465 case L2TP_PWTYPE_PPP_AC:
466 break;
467 case L2TP_PWTYPE_IP:
468 default:
469 ret = -EPROTONOSUPPORT;
470 break;
471 }
472
473 ret = -EPROTONOSUPPORT;
474 if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create)
475 ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id,
476 session_id, peer_session_id, &cfg);
477
478out:
479 return ret;
480}
481
482static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
483{
484 int ret = 0;
485 struct l2tp_session *session;
486 u16 pw_type;
487
488 session = l2tp_nl_session_find(info);
489 if (session == NULL) {
490 ret = -ENODEV;
491 goto out;
492 }
493
494 pw_type = session->pwtype;
495 if (pw_type < __L2TP_PWTYPE_MAX)
496 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
497 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
498
499out:
500 return ret;
501}
502
503static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
504{
505 int ret = 0;
506 struct l2tp_session *session;
507
508 session = l2tp_nl_session_find(info);
509 if (session == NULL) {
510 ret = -ENODEV;
511 goto out;
512 }
513
514 if (info->attrs[L2TP_ATTR_DEBUG])
515 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
516
517 if (info->attrs[L2TP_ATTR_DATA_SEQ])
518 session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
519
520 if (info->attrs[L2TP_ATTR_RECV_SEQ])
521 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
522
523 if (info->attrs[L2TP_ATTR_SEND_SEQ])
524 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
525
526 if (info->attrs[L2TP_ATTR_LNS_MODE])
527 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
528
529 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
530 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
531
532 if (info->attrs[L2TP_ATTR_MTU])
533 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
534
535 if (info->attrs[L2TP_ATTR_MRU])
536 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
537
538out:
539 return ret;
540}
541
542static int l2tp_nl_session_send(struct sk_buff *skb, u32 pid, u32 seq, int flags,
543 struct l2tp_session *session)
544{
545 void *hdr;
546 struct nlattr *nest;
547 struct l2tp_tunnel *tunnel = session->tunnel;
548 struct sock *sk = NULL;
549
550 sk = tunnel->sock;
551
552 hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags, L2TP_CMD_SESSION_GET);
553 if (IS_ERR(hdr))
554 return PTR_ERR(hdr);
555
556 NLA_PUT_U32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id);
557 NLA_PUT_U32(skb, L2TP_ATTR_SESSION_ID, session->session_id);
558 NLA_PUT_U32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id);
559 NLA_PUT_U32(skb, L2TP_ATTR_PEER_SESSION_ID, session->peer_session_id);
560 NLA_PUT_U32(skb, L2TP_ATTR_DEBUG, session->debug);
561 NLA_PUT_U16(skb, L2TP_ATTR_PW_TYPE, session->pwtype);
562 NLA_PUT_U16(skb, L2TP_ATTR_MTU, session->mtu);
563 if (session->mru)
564 NLA_PUT_U16(skb, L2TP_ATTR_MRU, session->mru);
565
566 if (session->ifname && session->ifname[0])
567 NLA_PUT_STRING(skb, L2TP_ATTR_IFNAME, session->ifname);
568 if (session->cookie_len)
569 NLA_PUT(skb, L2TP_ATTR_COOKIE, session->cookie_len, &session->cookie[0]);
570 if (session->peer_cookie_len)
571 NLA_PUT(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len, &session->peer_cookie[0]);
572 NLA_PUT_U8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq);
573 NLA_PUT_U8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq);
574 NLA_PUT_U8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode);
575#ifdef CONFIG_XFRM
576 if ((sk) && (sk->sk_policy[0] || sk->sk_policy[1]))
577 NLA_PUT_U8(skb, L2TP_ATTR_USING_IPSEC, 1);
578#endif
579 if (session->reorder_timeout)
580 NLA_PUT_MSECS(skb, L2TP_ATTR_RECV_TIMEOUT, session->reorder_timeout);
581
582 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
583 if (nest == NULL)
584 goto nla_put_failure;
585 NLA_PUT_U64(skb, L2TP_ATTR_TX_PACKETS, session->stats.tx_packets);
586 NLA_PUT_U64(skb, L2TP_ATTR_TX_BYTES, session->stats.tx_bytes);
587 NLA_PUT_U64(skb, L2TP_ATTR_TX_ERRORS, session->stats.tx_errors);
588 NLA_PUT_U64(skb, L2TP_ATTR_RX_PACKETS, session->stats.rx_packets);
589 NLA_PUT_U64(skb, L2TP_ATTR_RX_BYTES, session->stats.rx_bytes);
590 NLA_PUT_U64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, session->stats.rx_seq_discards);
591 NLA_PUT_U64(skb, L2TP_ATTR_RX_OOS_PACKETS, session->stats.rx_oos_packets);
592 NLA_PUT_U64(skb, L2TP_ATTR_RX_ERRORS, session->stats.rx_errors);
593 nla_nest_end(skb, nest);
594
595 return genlmsg_end(skb, hdr);
596
597 nla_put_failure:
598 genlmsg_cancel(skb, hdr);
599 return -1;
600}
601
602static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
603{
604 struct l2tp_session *session;
605 struct sk_buff *msg;
606 int ret;
607
608 session = l2tp_nl_session_find(info);
609 if (session == NULL) {
610 ret = -ENODEV;
611 goto out;
612 }
613
614 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
615 if (!msg) {
616 ret = -ENOMEM;
617 goto out;
618 }
619
620 ret = l2tp_nl_session_send(msg, info->snd_pid, info->snd_seq,
621 0, session);
622 if (ret < 0)
623 goto err_out;
624
625 return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
626
627err_out:
628 nlmsg_free(msg);
629
630out:
631 return ret;
632}
633
634static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
635{
636 struct net *net = sock_net(skb->sk);
637 struct l2tp_session *session;
638 struct l2tp_tunnel *tunnel = NULL;
639 int ti = cb->args[0];
640 int si = cb->args[1];
641
642 for (;;) {
643 if (tunnel == NULL) {
644 tunnel = l2tp_tunnel_find_nth(net, ti);
645 if (tunnel == NULL)
646 goto out;
647 }
648
649 session = l2tp_session_find_nth(tunnel, si);
650 if (session == NULL) {
651 ti++;
652 tunnel = NULL;
653 si = 0;
654 continue;
655 }
656
657 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).pid,
658 cb->nlh->nlmsg_seq, NLM_F_MULTI,
659 session) <= 0)
660 break;
661
662 si++;
663 }
664
665out:
666 cb->args[0] = ti;
667 cb->args[1] = si;
668
669 return skb->len;
670}
671
672static struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
673 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
674 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
675 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
676 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
677 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
678 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
679 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
680 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
681 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
682 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
683 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
684 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
685 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
686 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
687 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
688 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
689 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
690 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
691 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
692 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
693 [L2TP_ATTR_FD] = { .type = NLA_U32, },
694 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
695 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
696 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
697 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
698 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
699 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
700 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
701 [L2TP_ATTR_IFNAME] = {
702 .type = NLA_NUL_STRING,
703 .len = IFNAMSIZ - 1,
704 },
705 [L2TP_ATTR_COOKIE] = {
706 .type = NLA_BINARY,
707 .len = 8,
708 },
709 [L2TP_ATTR_PEER_COOKIE] = {
710 .type = NLA_BINARY,
711 .len = 8,
712 },
713};
714
715static struct genl_ops l2tp_nl_ops[] = {
716 {
717 .cmd = L2TP_CMD_NOOP,
718 .doit = l2tp_nl_cmd_noop,
719 .policy = l2tp_nl_policy,
720 /* can be retrieved by unprivileged users */
721 },
722 {
723 .cmd = L2TP_CMD_TUNNEL_CREATE,
724 .doit = l2tp_nl_cmd_tunnel_create,
725 .policy = l2tp_nl_policy,
726 .flags = GENL_ADMIN_PERM,
727 },
728 {
729 .cmd = L2TP_CMD_TUNNEL_DELETE,
730 .doit = l2tp_nl_cmd_tunnel_delete,
731 .policy = l2tp_nl_policy,
732 .flags = GENL_ADMIN_PERM,
733 },
734 {
735 .cmd = L2TP_CMD_TUNNEL_MODIFY,
736 .doit = l2tp_nl_cmd_tunnel_modify,
737 .policy = l2tp_nl_policy,
738 .flags = GENL_ADMIN_PERM,
739 },
740 {
741 .cmd = L2TP_CMD_TUNNEL_GET,
742 .doit = l2tp_nl_cmd_tunnel_get,
743 .dumpit = l2tp_nl_cmd_tunnel_dump,
744 .policy = l2tp_nl_policy,
745 .flags = GENL_ADMIN_PERM,
746 },
747 {
748 .cmd = L2TP_CMD_SESSION_CREATE,
749 .doit = l2tp_nl_cmd_session_create,
750 .policy = l2tp_nl_policy,
751 .flags = GENL_ADMIN_PERM,
752 },
753 {
754 .cmd = L2TP_CMD_SESSION_DELETE,
755 .doit = l2tp_nl_cmd_session_delete,
756 .policy = l2tp_nl_policy,
757 .flags = GENL_ADMIN_PERM,
758 },
759 {
760 .cmd = L2TP_CMD_SESSION_MODIFY,
761 .doit = l2tp_nl_cmd_session_modify,
762 .policy = l2tp_nl_policy,
763 .flags = GENL_ADMIN_PERM,
764 },
765 {
766 .cmd = L2TP_CMD_SESSION_GET,
767 .doit = l2tp_nl_cmd_session_get,
768 .dumpit = l2tp_nl_cmd_session_dump,
769 .policy = l2tp_nl_policy,
770 .flags = GENL_ADMIN_PERM,
771 },
772};
773
774int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
775{
776 int ret;
777
778 ret = -EINVAL;
779 if (pw_type >= __L2TP_PWTYPE_MAX)
780 goto err;
781
782 genl_lock();
783 ret = -EBUSY;
784 if (l2tp_nl_cmd_ops[pw_type])
785 goto out;
786
787 l2tp_nl_cmd_ops[pw_type] = ops;
788
789out:
790 genl_unlock();
791err:
792 return 0;
793}
794EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
795
796void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
797{
798 if (pw_type < __L2TP_PWTYPE_MAX) {
799 genl_lock();
800 l2tp_nl_cmd_ops[pw_type] = NULL;
801 genl_unlock();
802 }
803}
804EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
805
806static int l2tp_nl_init(void)
807{
808 int err;
809
810 printk(KERN_INFO "L2TP netlink interface\n");
811 err = genl_register_family_with_ops(&l2tp_nl_family, l2tp_nl_ops,
812 ARRAY_SIZE(l2tp_nl_ops));
813
814 return err;
815}
816
817static void l2tp_nl_cleanup(void)
818{
819 genl_unregister_family(&l2tp_nl_family);
820}
821
822module_init(l2tp_nl_init);
823module_exit(l2tp_nl_cleanup);
824
825MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
826MODULE_DESCRIPTION("L2TP netlink");
827MODULE_LICENSE("GPL");
828MODULE_VERSION("1.0");
829MODULE_ALIAS("net-pf-" __stringify(PF_NETLINK) "-proto-" \
830 __stringify(NETLINK_GENERIC) "-type-" "l2tp")
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-06 04:02:41 -0500