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mm/zsmalloc: allocate exactly size of struct zs_pool
[linux/fpc-iii.git] / net / l2tp / l2tp_netlink.c
blob0ac907adb2f472c0d49508ca6843363db27129b1
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 #if IS_ENABLED(CONFIG_IPV6)
166 if (info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX])
167 cfg.udp6_zero_tx_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]);
168 if (info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX])
169 cfg.udp6_zero_rx_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]);
170 #endif
171 }
172
173 if (info->attrs[L2TP_ATTR_DEBUG])
174 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
175
176 tunnel = l2tp_tunnel_find(net, tunnel_id);
177 if (tunnel != NULL) {
178 ret = -EEXIST;
179 goto out;
180 }
181
182 ret = -EINVAL;
183 switch (cfg.encap) {
184 case L2TP_ENCAPTYPE_UDP:
185 case L2TP_ENCAPTYPE_IP:
186 ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
187 peer_tunnel_id, &cfg, &tunnel);
188 break;
189 }
190
191 out:
192 return ret;
193 }
194
195 static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
196 {
197 struct l2tp_tunnel *tunnel;
198 u32 tunnel_id;
199 int ret = 0;
200 struct net *net = genl_info_net(info);
201
202 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
203 ret = -EINVAL;
204 goto out;
205 }
206 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
207
208 tunnel = l2tp_tunnel_find(net, tunnel_id);
209 if (tunnel == NULL) {
210 ret = -ENODEV;
211 goto out;
212 }
213
214 (void) l2tp_tunnel_delete(tunnel);
215
216 out:
217 return ret;
218 }
219
220 static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
221 {
222 struct l2tp_tunnel *tunnel;
223 u32 tunnel_id;
224 int ret = 0;
225 struct net *net = genl_info_net(info);
226
227 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
228 ret = -EINVAL;
229 goto out;
230 }
231 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
232
233 tunnel = l2tp_tunnel_find(net, tunnel_id);
234 if (tunnel == NULL) {
235 ret = -ENODEV;
236 goto out;
237 }
238
239 if (info->attrs[L2TP_ATTR_DEBUG])
240 tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
241
242 out:
243 return ret;
244 }
245
246 static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
247 struct l2tp_tunnel *tunnel)
248 {
249 void *hdr;
250 struct nlattr *nest;
251 struct sock *sk = NULL;
252 struct inet_sock *inet;
253 #if IS_ENABLED(CONFIG_IPV6)
254 struct ipv6_pinfo *np = NULL;
255 #endif
256
257 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags,
258 L2TP_CMD_TUNNEL_GET);
259 if (!hdr)
260 return -EMSGSIZE;
261
262 if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
263 nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
264 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
265 nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) ||
266 nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
267 goto nla_put_failure;
268
269 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
270 if (nest == NULL)
271 goto nla_put_failure;
272
273 if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS,
274 atomic_long_read(&tunnel->stats.tx_packets)) ||
275 nla_put_u64(skb, L2TP_ATTR_TX_BYTES,
276 atomic_long_read(&tunnel->stats.tx_bytes)) ||
277 nla_put_u64(skb, L2TP_ATTR_TX_ERRORS,
278 atomic_long_read(&tunnel->stats.tx_errors)) ||
279 nla_put_u64(skb, L2TP_ATTR_RX_PACKETS,
280 atomic_long_read(&tunnel->stats.rx_packets)) ||
281 nla_put_u64(skb, L2TP_ATTR_RX_BYTES,
282 atomic_long_read(&tunnel->stats.rx_bytes)) ||
283 nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
284 atomic_long_read(&tunnel->stats.rx_seq_discards)) ||
285 nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS,
286 atomic_long_read(&tunnel->stats.rx_oos_packets)) ||
287 nla_put_u64(skb, L2TP_ATTR_RX_ERRORS,
288 atomic_long_read(&tunnel->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, !sk->sk_no_check_tx))
308 goto nla_put_failure;
309 /* NOBREAK */
310 case L2TP_ENCAPTYPE_IP:
311 #if IS_ENABLED(CONFIG_IPV6)
312 if (np) {
313 if (nla_put(skb, L2TP_ATTR_IP6_SADDR, sizeof(np->saddr),
314 &np->saddr) ||
315 nla_put(skb, L2TP_ATTR_IP6_DADDR, sizeof(sk->sk_v6_daddr),
316 &sk->sk_v6_daddr))
317 goto nla_put_failure;
318 } else
319 #endif
320 if (nla_put_be32(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr) ||
321 nla_put_be32(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr))
322 goto nla_put_failure;
323 break;
324 }
325
326 out:
327 return genlmsg_end(skb, hdr);
328
329 nla_put_failure:
330 genlmsg_cancel(skb, hdr);
331 return -1;
332 }
333
334 static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
335 {
336 struct l2tp_tunnel *tunnel;
337 struct sk_buff *msg;
338 u32 tunnel_id;
339 int ret = -ENOBUFS;
340 struct net *net = genl_info_net(info);
341
342 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
343 ret = -EINVAL;
344 goto out;
345 }
346
347 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
348
349 tunnel = l2tp_tunnel_find(net, tunnel_id);
350 if (tunnel == NULL) {
351 ret = -ENODEV;
352 goto out;
353 }
354
355 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
356 if (!msg) {
357 ret = -ENOMEM;
358 goto out;
359 }
360
361 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
362 NLM_F_ACK, tunnel);
363 if (ret < 0)
364 goto err_out;
365
366 return genlmsg_unicast(net, msg, info->snd_portid);
367
368 err_out:
369 nlmsg_free(msg);
370
371 out:
372 return ret;
373 }
374
375 static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
376 {
377 int ti = cb->args[0];
378 struct l2tp_tunnel *tunnel;
379 struct net *net = sock_net(skb->sk);
380
381 for (;;) {
382 tunnel = l2tp_tunnel_find_nth(net, ti);
383 if (tunnel == NULL)
384 goto out;
385
386 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
387 cb->nlh->nlmsg_seq, NLM_F_MULTI,
388 tunnel) <= 0)
389 goto out;
390
391 ti++;
392 }
393
394 out:
395 cb->args[0] = ti;
396
397 return skb->len;
398 }
399
400 static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
401 {
402 u32 tunnel_id = 0;
403 u32 session_id;
404 u32 peer_session_id;
405 int ret = 0;
406 struct l2tp_tunnel *tunnel;
407 struct l2tp_session *session;
408 struct l2tp_session_cfg cfg = { 0, };
409 struct net *net = genl_info_net(info);
410
411 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
412 ret = -EINVAL;
413 goto out;
414 }
415 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
416 tunnel = l2tp_tunnel_find(net, tunnel_id);
417 if (!tunnel) {
418 ret = -ENODEV;
419 goto out;
420 }
421
422 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
423 ret = -EINVAL;
424 goto out;
425 }
426 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
427 session = l2tp_session_find(net, tunnel, session_id);
428 if (session) {
429 ret = -EEXIST;
430 goto out;
431 }
432
433 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
434 ret = -EINVAL;
435 goto out;
436 }
437 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
438
439 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
440 ret = -EINVAL;
441 goto out;
442 }
443 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
444 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
445 ret = -EINVAL;
446 goto out;
447 }
448
449 if (tunnel->version > 2) {
450 if (info->attrs[L2TP_ATTR_OFFSET])
451 cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
452
453 if (info->attrs[L2TP_ATTR_DATA_SEQ])
454 cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
455
456 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
457 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
458 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
459
460 cfg.l2specific_len = 4;
461 if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
462 cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
463
464 if (info->attrs[L2TP_ATTR_COOKIE]) {
465 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
466 if (len > 8) {
467 ret = -EINVAL;
468 goto out;
469 }
470 cfg.cookie_len = len;
471 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
472 }
473 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
474 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
475 if (len > 8) {
476 ret = -EINVAL;
477 goto out;
478 }
479 cfg.peer_cookie_len = len;
480 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
481 }
482 if (info->attrs[L2TP_ATTR_IFNAME])
483 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
484
485 if (info->attrs[L2TP_ATTR_VLAN_ID])
486 cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
487 }
488
489 if (info->attrs[L2TP_ATTR_DEBUG])
490 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
491
492 if (info->attrs[L2TP_ATTR_RECV_SEQ])
493 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
494
495 if (info->attrs[L2TP_ATTR_SEND_SEQ])
496 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
497
498 if (info->attrs[L2TP_ATTR_LNS_MODE])
499 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
500
501 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
502 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
503
504 if (info->attrs[L2TP_ATTR_MTU])
505 cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
506
507 if (info->attrs[L2TP_ATTR_MRU])
508 cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
509
510 if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
511 (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
512 ret = -EPROTONOSUPPORT;
513 goto out;
514 }
515
516 /* Check that pseudowire-specific params are present */
517 switch (cfg.pw_type) {
518 case L2TP_PWTYPE_NONE:
519 break;
520 case L2TP_PWTYPE_ETH_VLAN:
521 if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
522 ret = -EINVAL;
523 goto out;
524 }
525 break;
526 case L2TP_PWTYPE_ETH:
527 break;
528 case L2TP_PWTYPE_PPP:
529 case L2TP_PWTYPE_PPP_AC:
530 break;
531 case L2TP_PWTYPE_IP:
532 default:
533 ret = -EPROTONOSUPPORT;
534 break;
535 }
536
537 ret = -EPROTONOSUPPORT;
538 if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create)
539 ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id,
540 session_id, peer_session_id, &cfg);
541
542 out:
543 return ret;
544 }
545
546 static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
547 {
548 int ret = 0;
549 struct l2tp_session *session;
550 u16 pw_type;
551
552 session = l2tp_nl_session_find(info);
553 if (session == NULL) {
554 ret = -ENODEV;
555 goto out;
556 }
557
558 pw_type = session->pwtype;
559 if (pw_type < __L2TP_PWTYPE_MAX)
560 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
561 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
562
563 out:
564 return ret;
565 }
566
567 static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
568 {
569 int ret = 0;
570 struct l2tp_session *session;
571
572 session = l2tp_nl_session_find(info);
573 if (session == NULL) {
574 ret = -ENODEV;
575 goto out;
576 }
577
578 if (info->attrs[L2TP_ATTR_DEBUG])
579 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
580
581 if (info->attrs[L2TP_ATTR_DATA_SEQ])
582 session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
583
584 if (info->attrs[L2TP_ATTR_RECV_SEQ])
585 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
586
587 if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
588 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
589 l2tp_session_set_header_len(session, session->tunnel->version);
590 }
591
592 if (info->attrs[L2TP_ATTR_LNS_MODE])
593 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
594
595 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
596 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
597
598 if (info->attrs[L2TP_ATTR_MTU])
599 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
600
601 if (info->attrs[L2TP_ATTR_MRU])
602 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
603
604 out:
605 return ret;
606 }
607
608 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
609 struct l2tp_session *session)
610 {
611 void *hdr;
612 struct nlattr *nest;
613 struct l2tp_tunnel *tunnel = session->tunnel;
614 struct sock *sk = NULL;
615
616 sk = tunnel->sock;
617
618 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, L2TP_CMD_SESSION_GET);
619 if (!hdr)
620 return -EMSGSIZE;
621
622 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
623 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
624 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
625 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
626 session->peer_session_id) ||
627 nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
628 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) ||
629 nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) ||
630 (session->mru &&
631 nla_put_u16(skb, L2TP_ATTR_MRU, session->mru)))
632 goto nla_put_failure;
633
634 if ((session->ifname[0] &&
635 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
636 (session->cookie_len &&
637 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
638 &session->cookie[0])) ||
639 (session->peer_cookie_len &&
640 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
641 &session->peer_cookie[0])) ||
642 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
643 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
644 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
645 #ifdef CONFIG_XFRM
646 (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) &&
647 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
648 #endif
649 (session->reorder_timeout &&
650 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT, session->reorder_timeout)))
651 goto nla_put_failure;
652
653 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
654 if (nest == NULL)
655 goto nla_put_failure;
656
657 if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS,
658 atomic_long_read(&session->stats.tx_packets)) ||
659 nla_put_u64(skb, L2TP_ATTR_TX_BYTES,
660 atomic_long_read(&session->stats.tx_bytes)) ||
661 nla_put_u64(skb, L2TP_ATTR_TX_ERRORS,
662 atomic_long_read(&session->stats.tx_errors)) ||
663 nla_put_u64(skb, L2TP_ATTR_RX_PACKETS,
664 atomic_long_read(&session->stats.rx_packets)) ||
665 nla_put_u64(skb, L2TP_ATTR_RX_BYTES,
666 atomic_long_read(&session->stats.rx_bytes)) ||
667 nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
668 atomic_long_read(&session->stats.rx_seq_discards)) ||
669 nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS,
670 atomic_long_read(&session->stats.rx_oos_packets)) ||
671 nla_put_u64(skb, L2TP_ATTR_RX_ERRORS,
672 atomic_long_read(&session->stats.rx_errors)))
673 goto nla_put_failure;
674 nla_nest_end(skb, nest);
675
676 return genlmsg_end(skb, hdr);
677
678 nla_put_failure:
679 genlmsg_cancel(skb, hdr);
680 return -1;
681 }
682
683 static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
684 {
685 struct l2tp_session *session;
686 struct sk_buff *msg;
687 int ret;
688
689 session = l2tp_nl_session_find(info);
690 if (session == NULL) {
691 ret = -ENODEV;
692 goto out;
693 }
694
695 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
696 if (!msg) {
697 ret = -ENOMEM;
698 goto out;
699 }
700
701 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
702 0, session);
703 if (ret < 0)
704 goto err_out;
705
706 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
707
708 err_out:
709 nlmsg_free(msg);
710
711 out:
712 return ret;
713 }
714
715 static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
716 {
717 struct net *net = sock_net(skb->sk);
718 struct l2tp_session *session;
719 struct l2tp_tunnel *tunnel = NULL;
720 int ti = cb->args[0];
721 int si = cb->args[1];
722
723 for (;;) {
724 if (tunnel == NULL) {
725 tunnel = l2tp_tunnel_find_nth(net, ti);
726 if (tunnel == NULL)
727 goto out;
728 }
729
730 session = l2tp_session_find_nth(tunnel, si);
731 if (session == NULL) {
732 ti++;
733 tunnel = NULL;
734 si = 0;
735 continue;
736 }
737
738 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
739 cb->nlh->nlmsg_seq, NLM_F_MULTI,
740 session) <= 0)
741 break;
742
743 si++;
744 }
745
746 out:
747 cb->args[0] = ti;
748 cb->args[1] = si;
749
750 return skb->len;
751 }
752
753 static struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
754 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
755 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
756 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
757 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
758 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
759 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
760 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
761 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
762 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
763 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
764 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
765 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
766 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
767 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
768 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
769 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
770 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
771 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
772 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
773 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
774 [L2TP_ATTR_FD] = { .type = NLA_U32, },
775 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
776 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
777 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
778 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
779 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
780 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
781 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
782 [L2TP_ATTR_IP6_SADDR] = {
783 .type = NLA_BINARY,
784 .len = sizeof(struct in6_addr),
785 },
786 [L2TP_ATTR_IP6_DADDR] = {
787 .type = NLA_BINARY,
788 .len = sizeof(struct in6_addr),
789 },
790 [L2TP_ATTR_IFNAME] = {
791 .type = NLA_NUL_STRING,
792 .len = IFNAMSIZ - 1,
793 },
794 [L2TP_ATTR_COOKIE] = {
795 .type = NLA_BINARY,
796 .len = 8,
797 },
798 [L2TP_ATTR_PEER_COOKIE] = {
799 .type = NLA_BINARY,
800 .len = 8,
801 },
802 };
803
804 static const struct genl_ops l2tp_nl_ops[] = {
805 {
806 .cmd = L2TP_CMD_NOOP,
807 .doit = l2tp_nl_cmd_noop,
808 .policy = l2tp_nl_policy,
809 /* can be retrieved by unprivileged users */
810 },
811 {
812 .cmd = L2TP_CMD_TUNNEL_CREATE,
813 .doit = l2tp_nl_cmd_tunnel_create,
814 .policy = l2tp_nl_policy,
815 .flags = GENL_ADMIN_PERM,
816 },
817 {
818 .cmd = L2TP_CMD_TUNNEL_DELETE,
819 .doit = l2tp_nl_cmd_tunnel_delete,
820 .policy = l2tp_nl_policy,
821 .flags = GENL_ADMIN_PERM,
822 },
823 {
824 .cmd = L2TP_CMD_TUNNEL_MODIFY,
825 .doit = l2tp_nl_cmd_tunnel_modify,
826 .policy = l2tp_nl_policy,
827 .flags = GENL_ADMIN_PERM,
828 },
829 {
830 .cmd = L2TP_CMD_TUNNEL_GET,
831 .doit = l2tp_nl_cmd_tunnel_get,
832 .dumpit = l2tp_nl_cmd_tunnel_dump,
833 .policy = l2tp_nl_policy,
834 .flags = GENL_ADMIN_PERM,
835 },
836 {
837 .cmd = L2TP_CMD_SESSION_CREATE,
838 .doit = l2tp_nl_cmd_session_create,
839 .policy = l2tp_nl_policy,
840 .flags = GENL_ADMIN_PERM,
841 },
842 {
843 .cmd = L2TP_CMD_SESSION_DELETE,
844 .doit = l2tp_nl_cmd_session_delete,
845 .policy = l2tp_nl_policy,
846 .flags = GENL_ADMIN_PERM,
847 },
848 {
849 .cmd = L2TP_CMD_SESSION_MODIFY,
850 .doit = l2tp_nl_cmd_session_modify,
851 .policy = l2tp_nl_policy,
852 .flags = GENL_ADMIN_PERM,
853 },
854 {
855 .cmd = L2TP_CMD_SESSION_GET,
856 .doit = l2tp_nl_cmd_session_get,
857 .dumpit = l2tp_nl_cmd_session_dump,
858 .policy = l2tp_nl_policy,
859 .flags = GENL_ADMIN_PERM,
860 },
861 };
862
863 int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
864 {
865 int ret;
866
867 ret = -EINVAL;
868 if (pw_type >= __L2TP_PWTYPE_MAX)
869 goto err;
870
871 genl_lock();
872 ret = -EBUSY;
873 if (l2tp_nl_cmd_ops[pw_type])
874 goto out;
875
876 l2tp_nl_cmd_ops[pw_type] = ops;
877 ret = 0;
878
879 out:
880 genl_unlock();
881 err:
882 return ret;
883 }
884 EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
885
886 void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
887 {
888 if (pw_type < __L2TP_PWTYPE_MAX) {
889 genl_lock();
890 l2tp_nl_cmd_ops[pw_type] = NULL;
891 genl_unlock();
892 }
893 }
894 EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
895
896 static int l2tp_nl_init(void)
897 {
898 pr_info("L2TP netlink interface\n");
899 return genl_register_family_with_ops(&l2tp_nl_family, l2tp_nl_ops);
900 }
901
902 static void l2tp_nl_cleanup(void)
903 {
904 genl_unregister_family(&l2tp_nl_family);
905 }
906
907 module_init(l2tp_nl_init);
908 module_exit(l2tp_nl_cleanup);
909
910 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
911 MODULE_DESCRIPTION("L2TP netlink");
912 MODULE_LICENSE("GPL");
913 MODULE_VERSION("1.0");
914 MODULE_ALIAS_GENL_FAMILY("l2tp");
Linux with added FPC-III support