Commit | Line | Data |
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309795f4 JC |
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 | ||
32 | static 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 */ | |
41 | static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX]; | |
42 | ||
43 | static 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 | ||
67 | static 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 | ||
90 | err_out: | |
91 | nlmsg_free(msg); | |
92 | ||
93 | out: | |
94 | return ret; | |
95 | } | |
96 | ||
97 | static 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 | ||
789a4a2c JC |
132 | fd = -1; |
133 | if (info->attrs[L2TP_ATTR_FD]) { | |
134 | fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]); | |
135 | } else { | |
136 | if (info->attrs[L2TP_ATTR_IP_SADDR]) | |
137 | cfg.local_ip.s_addr = nla_get_be32(info->attrs[L2TP_ATTR_IP_SADDR]); | |
138 | if (info->attrs[L2TP_ATTR_IP_DADDR]) | |
139 | cfg.peer_ip.s_addr = nla_get_be32(info->attrs[L2TP_ATTR_IP_DADDR]); | |
140 | if (info->attrs[L2TP_ATTR_UDP_SPORT]) | |
141 | cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]); | |
142 | if (info->attrs[L2TP_ATTR_UDP_DPORT]) | |
143 | cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]); | |
144 | if (info->attrs[L2TP_ATTR_UDP_CSUM]) | |
145 | cfg.use_udp_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_CSUM]); | |
309795f4 | 146 | } |
309795f4 JC |
147 | |
148 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
149 | cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
150 | ||
151 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
152 | if (tunnel != NULL) { | |
153 | ret = -EEXIST; | |
154 | goto out; | |
155 | } | |
156 | ||
157 | ret = -EINVAL; | |
158 | switch (cfg.encap) { | |
159 | case L2TP_ENCAPTYPE_UDP: | |
160 | case L2TP_ENCAPTYPE_IP: | |
161 | ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id, | |
162 | peer_tunnel_id, &cfg, &tunnel); | |
163 | break; | |
164 | } | |
165 | ||
166 | out: | |
167 | return ret; | |
168 | } | |
169 | ||
170 | static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info) | |
171 | { | |
172 | struct l2tp_tunnel *tunnel; | |
173 | u32 tunnel_id; | |
174 | int ret = 0; | |
175 | struct net *net = genl_info_net(info); | |
176 | ||
177 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { | |
178 | ret = -EINVAL; | |
179 | goto out; | |
180 | } | |
181 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
182 | ||
183 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
184 | if (tunnel == NULL) { | |
185 | ret = -ENODEV; | |
186 | goto out; | |
187 | } | |
188 | ||
189 | (void) l2tp_tunnel_delete(tunnel); | |
190 | ||
191 | out: | |
192 | return ret; | |
193 | } | |
194 | ||
195 | static int l2tp_nl_cmd_tunnel_modify(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 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
215 | tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
216 | ||
217 | out: | |
218 | return ret; | |
219 | } | |
220 | ||
221 | static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 pid, u32 seq, int flags, | |
222 | struct l2tp_tunnel *tunnel) | |
223 | { | |
224 | void *hdr; | |
225 | struct nlattr *nest; | |
226 | struct sock *sk = NULL; | |
227 | struct inet_sock *inet; | |
228 | ||
229 | hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags, | |
230 | L2TP_CMD_TUNNEL_GET); | |
231 | if (IS_ERR(hdr)) | |
232 | return PTR_ERR(hdr); | |
233 | ||
60aed2ab DM |
234 | if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) || |
235 | nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) || | |
236 | nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) || | |
237 | nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) || | |
238 | nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap)) | |
239 | goto nla_put_failure; | |
309795f4 JC |
240 | |
241 | nest = nla_nest_start(skb, L2TP_ATTR_STATS); | |
242 | if (nest == NULL) | |
243 | goto nla_put_failure; | |
244 | ||
60aed2ab DM |
245 | if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, tunnel->stats.tx_packets) || |
246 | nla_put_u64(skb, L2TP_ATTR_TX_BYTES, tunnel->stats.tx_bytes) || | |
247 | nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, tunnel->stats.tx_errors) || | |
248 | nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, tunnel->stats.rx_packets) || | |
249 | nla_put_u64(skb, L2TP_ATTR_RX_BYTES, tunnel->stats.rx_bytes) || | |
250 | nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, | |
251 | tunnel->stats.rx_seq_discards) || | |
252 | nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS, | |
253 | tunnel->stats.rx_oos_packets) || | |
254 | nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, tunnel->stats.rx_errors)) | |
255 | goto nla_put_failure; | |
309795f4 JC |
256 | nla_nest_end(skb, nest); |
257 | ||
258 | sk = tunnel->sock; | |
259 | if (!sk) | |
260 | goto out; | |
261 | ||
262 | inet = inet_sk(sk); | |
263 | ||
264 | switch (tunnel->encap) { | |
265 | case L2TP_ENCAPTYPE_UDP: | |
60aed2ab DM |
266 | if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) || |
267 | nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)) || | |
268 | nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, | |
269 | (sk->sk_no_check != UDP_CSUM_NOXMIT))) | |
270 | goto nla_put_failure; | |
309795f4 JC |
271 | /* NOBREAK */ |
272 | case L2TP_ENCAPTYPE_IP: | |
60aed2ab DM |
273 | if (nla_put_be32(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr) || |
274 | nla_put_be32(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr)) | |
275 | goto nla_put_failure; | |
309795f4 JC |
276 | break; |
277 | } | |
278 | ||
279 | out: | |
280 | return genlmsg_end(skb, hdr); | |
281 | ||
282 | nla_put_failure: | |
283 | genlmsg_cancel(skb, hdr); | |
284 | return -1; | |
285 | } | |
286 | ||
287 | static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info) | |
288 | { | |
289 | struct l2tp_tunnel *tunnel; | |
290 | struct sk_buff *msg; | |
291 | u32 tunnel_id; | |
292 | int ret = -ENOBUFS; | |
293 | struct net *net = genl_info_net(info); | |
294 | ||
295 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { | |
296 | ret = -EINVAL; | |
297 | goto out; | |
298 | } | |
299 | ||
300 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
301 | ||
302 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
303 | if (tunnel == NULL) { | |
304 | ret = -ENODEV; | |
305 | goto out; | |
306 | } | |
307 | ||
308 | msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
309 | if (!msg) { | |
310 | ret = -ENOMEM; | |
311 | goto out; | |
312 | } | |
313 | ||
314 | ret = l2tp_nl_tunnel_send(msg, info->snd_pid, info->snd_seq, | |
315 | NLM_F_ACK, tunnel); | |
316 | if (ret < 0) | |
317 | goto err_out; | |
318 | ||
319 | return genlmsg_unicast(net, msg, info->snd_pid); | |
320 | ||
321 | err_out: | |
322 | nlmsg_free(msg); | |
323 | ||
324 | out: | |
325 | return ret; | |
326 | } | |
327 | ||
328 | static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
329 | { | |
330 | int ti = cb->args[0]; | |
331 | struct l2tp_tunnel *tunnel; | |
332 | struct net *net = sock_net(skb->sk); | |
333 | ||
334 | for (;;) { | |
335 | tunnel = l2tp_tunnel_find_nth(net, ti); | |
336 | if (tunnel == NULL) | |
337 | goto out; | |
338 | ||
339 | if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).pid, | |
340 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
341 | tunnel) <= 0) | |
342 | goto out; | |
343 | ||
344 | ti++; | |
345 | } | |
346 | ||
347 | out: | |
348 | cb->args[0] = ti; | |
349 | ||
350 | return skb->len; | |
351 | } | |
352 | ||
353 | static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info) | |
354 | { | |
355 | u32 tunnel_id = 0; | |
356 | u32 session_id; | |
357 | u32 peer_session_id; | |
358 | int ret = 0; | |
359 | struct l2tp_tunnel *tunnel; | |
360 | struct l2tp_session *session; | |
361 | struct l2tp_session_cfg cfg = { 0, }; | |
362 | struct net *net = genl_info_net(info); | |
363 | ||
364 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { | |
365 | ret = -EINVAL; | |
366 | goto out; | |
367 | } | |
368 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
369 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
370 | if (!tunnel) { | |
371 | ret = -ENODEV; | |
372 | goto out; | |
373 | } | |
374 | ||
375 | if (!info->attrs[L2TP_ATTR_SESSION_ID]) { | |
376 | ret = -EINVAL; | |
377 | goto out; | |
378 | } | |
379 | session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]); | |
380 | session = l2tp_session_find(net, tunnel, session_id); | |
381 | if (session) { | |
382 | ret = -EEXIST; | |
383 | goto out; | |
384 | } | |
385 | ||
386 | if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) { | |
387 | ret = -EINVAL; | |
388 | goto out; | |
389 | } | |
390 | peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]); | |
391 | ||
392 | if (!info->attrs[L2TP_ATTR_PW_TYPE]) { | |
393 | ret = -EINVAL; | |
394 | goto out; | |
395 | } | |
396 | cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]); | |
397 | if (cfg.pw_type >= __L2TP_PWTYPE_MAX) { | |
398 | ret = -EINVAL; | |
399 | goto out; | |
400 | } | |
401 | ||
402 | if (tunnel->version > 2) { | |
403 | if (info->attrs[L2TP_ATTR_OFFSET]) | |
404 | cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]); | |
405 | ||
406 | if (info->attrs[L2TP_ATTR_DATA_SEQ]) | |
407 | cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]); | |
408 | ||
409 | cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT; | |
410 | if (info->attrs[L2TP_ATTR_L2SPEC_TYPE]) | |
411 | cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]); | |
412 | ||
413 | cfg.l2specific_len = 4; | |
414 | if (info->attrs[L2TP_ATTR_L2SPEC_LEN]) | |
415 | cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]); | |
416 | ||
417 | if (info->attrs[L2TP_ATTR_COOKIE]) { | |
418 | u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]); | |
419 | if (len > 8) { | |
420 | ret = -EINVAL; | |
421 | goto out; | |
422 | } | |
423 | cfg.cookie_len = len; | |
424 | memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len); | |
425 | } | |
426 | if (info->attrs[L2TP_ATTR_PEER_COOKIE]) { | |
427 | u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]); | |
428 | if (len > 8) { | |
429 | ret = -EINVAL; | |
430 | goto out; | |
431 | } | |
432 | cfg.peer_cookie_len = len; | |
433 | memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len); | |
434 | } | |
435 | if (info->attrs[L2TP_ATTR_IFNAME]) | |
436 | cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]); | |
437 | ||
438 | if (info->attrs[L2TP_ATTR_VLAN_ID]) | |
439 | cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]); | |
440 | } | |
441 | ||
442 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
443 | cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
444 | ||
445 | if (info->attrs[L2TP_ATTR_RECV_SEQ]) | |
446 | cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]); | |
447 | ||
448 | if (info->attrs[L2TP_ATTR_SEND_SEQ]) | |
449 | cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]); | |
450 | ||
451 | if (info->attrs[L2TP_ATTR_LNS_MODE]) | |
452 | cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]); | |
453 | ||
454 | if (info->attrs[L2TP_ATTR_RECV_TIMEOUT]) | |
455 | cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]); | |
456 | ||
457 | if (info->attrs[L2TP_ATTR_MTU]) | |
458 | cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]); | |
459 | ||
460 | if (info->attrs[L2TP_ATTR_MRU]) | |
461 | cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]); | |
462 | ||
463 | if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) || | |
464 | (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) { | |
465 | ret = -EPROTONOSUPPORT; | |
466 | goto out; | |
467 | } | |
468 | ||
469 | /* Check that pseudowire-specific params are present */ | |
470 | switch (cfg.pw_type) { | |
471 | case L2TP_PWTYPE_NONE: | |
472 | break; | |
473 | case L2TP_PWTYPE_ETH_VLAN: | |
474 | if (!info->attrs[L2TP_ATTR_VLAN_ID]) { | |
475 | ret = -EINVAL; | |
476 | goto out; | |
477 | } | |
478 | break; | |
479 | case L2TP_PWTYPE_ETH: | |
480 | break; | |
481 | case L2TP_PWTYPE_PPP: | |
482 | case L2TP_PWTYPE_PPP_AC: | |
483 | break; | |
484 | case L2TP_PWTYPE_IP: | |
485 | default: | |
486 | ret = -EPROTONOSUPPORT; | |
487 | break; | |
488 | } | |
489 | ||
490 | ret = -EPROTONOSUPPORT; | |
491 | if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create) | |
492 | ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id, | |
493 | session_id, peer_session_id, &cfg); | |
494 | ||
495 | out: | |
496 | return ret; | |
497 | } | |
498 | ||
499 | static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info) | |
500 | { | |
501 | int ret = 0; | |
502 | struct l2tp_session *session; | |
503 | u16 pw_type; | |
504 | ||
505 | session = l2tp_nl_session_find(info); | |
506 | if (session == NULL) { | |
507 | ret = -ENODEV; | |
508 | goto out; | |
509 | } | |
510 | ||
511 | pw_type = session->pwtype; | |
512 | if (pw_type < __L2TP_PWTYPE_MAX) | |
513 | if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete) | |
514 | ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session); | |
515 | ||
516 | out: | |
517 | return ret; | |
518 | } | |
519 | ||
520 | static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info) | |
521 | { | |
522 | int ret = 0; | |
523 | struct l2tp_session *session; | |
524 | ||
525 | session = l2tp_nl_session_find(info); | |
526 | if (session == NULL) { | |
527 | ret = -ENODEV; | |
528 | goto out; | |
529 | } | |
530 | ||
531 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
532 | session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
533 | ||
534 | if (info->attrs[L2TP_ATTR_DATA_SEQ]) | |
535 | session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]); | |
536 | ||
537 | if (info->attrs[L2TP_ATTR_RECV_SEQ]) | |
538 | session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]); | |
539 | ||
540 | if (info->attrs[L2TP_ATTR_SEND_SEQ]) | |
541 | session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]); | |
542 | ||
543 | if (info->attrs[L2TP_ATTR_LNS_MODE]) | |
544 | session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]); | |
545 | ||
546 | if (info->attrs[L2TP_ATTR_RECV_TIMEOUT]) | |
547 | session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]); | |
548 | ||
549 | if (info->attrs[L2TP_ATTR_MTU]) | |
550 | session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]); | |
551 | ||
552 | if (info->attrs[L2TP_ATTR_MRU]) | |
553 | session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]); | |
554 | ||
555 | out: | |
556 | return ret; | |
557 | } | |
558 | ||
559 | static int l2tp_nl_session_send(struct sk_buff *skb, u32 pid, u32 seq, int flags, | |
560 | struct l2tp_session *session) | |
561 | { | |
562 | void *hdr; | |
563 | struct nlattr *nest; | |
564 | struct l2tp_tunnel *tunnel = session->tunnel; | |
565 | struct sock *sk = NULL; | |
566 | ||
567 | sk = tunnel->sock; | |
568 | ||
569 | hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags, L2TP_CMD_SESSION_GET); | |
570 | if (IS_ERR(hdr)) | |
571 | return PTR_ERR(hdr); | |
572 | ||
60aed2ab DM |
573 | if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) || |
574 | nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) || | |
575 | nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) || | |
576 | nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID, | |
577 | session->peer_session_id) || | |
578 | nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) || | |
579 | nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) || | |
580 | nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) || | |
581 | (session->mru && | |
582 | nla_put_u16(skb, L2TP_ATTR_MRU, session->mru))) | |
583 | goto nla_put_failure; | |
584 | ||
585 | if ((session->ifname && session->ifname[0] && | |
586 | nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) || | |
587 | (session->cookie_len && | |
588 | nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len, | |
589 | &session->cookie[0])) || | |
590 | (session->peer_cookie_len && | |
591 | nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len, | |
592 | &session->peer_cookie[0])) || | |
593 | nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) || | |
594 | nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) || | |
595 | nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) || | |
309795f4 | 596 | #ifdef CONFIG_XFRM |
60aed2ab DM |
597 | (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) && |
598 | nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) || | |
309795f4 | 599 | #endif |
60aed2ab DM |
600 | (session->reorder_timeout && |
601 | nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT, session->reorder_timeout))) | |
602 | goto nla_put_failure; | |
309795f4 JC |
603 | nest = nla_nest_start(skb, L2TP_ATTR_STATS); |
604 | if (nest == NULL) | |
605 | goto nla_put_failure; | |
60aed2ab DM |
606 | if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, session->stats.tx_packets) || |
607 | nla_put_u64(skb, L2TP_ATTR_TX_BYTES, session->stats.tx_bytes) || | |
608 | nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, session->stats.tx_errors) || | |
609 | nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, session->stats.rx_packets) || | |
610 | nla_put_u64(skb, L2TP_ATTR_RX_BYTES, session->stats.rx_bytes) || | |
611 | nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, | |
612 | session->stats.rx_seq_discards) || | |
613 | nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS, | |
614 | session->stats.rx_oos_packets) || | |
615 | nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, session->stats.rx_errors)) | |
616 | goto nla_put_failure; | |
309795f4 JC |
617 | nla_nest_end(skb, nest); |
618 | ||
619 | return genlmsg_end(skb, hdr); | |
620 | ||
621 | nla_put_failure: | |
622 | genlmsg_cancel(skb, hdr); | |
623 | return -1; | |
624 | } | |
625 | ||
626 | static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info) | |
627 | { | |
628 | struct l2tp_session *session; | |
629 | struct sk_buff *msg; | |
630 | int ret; | |
631 | ||
632 | session = l2tp_nl_session_find(info); | |
633 | if (session == NULL) { | |
634 | ret = -ENODEV; | |
635 | goto out; | |
636 | } | |
637 | ||
638 | msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
639 | if (!msg) { | |
640 | ret = -ENOMEM; | |
641 | goto out; | |
642 | } | |
643 | ||
644 | ret = l2tp_nl_session_send(msg, info->snd_pid, info->snd_seq, | |
645 | 0, session); | |
646 | if (ret < 0) | |
647 | goto err_out; | |
648 | ||
649 | return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid); | |
650 | ||
651 | err_out: | |
652 | nlmsg_free(msg); | |
653 | ||
654 | out: | |
655 | return ret; | |
656 | } | |
657 | ||
658 | static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
659 | { | |
660 | struct net *net = sock_net(skb->sk); | |
661 | struct l2tp_session *session; | |
662 | struct l2tp_tunnel *tunnel = NULL; | |
663 | int ti = cb->args[0]; | |
664 | int si = cb->args[1]; | |
665 | ||
666 | for (;;) { | |
667 | if (tunnel == NULL) { | |
668 | tunnel = l2tp_tunnel_find_nth(net, ti); | |
669 | if (tunnel == NULL) | |
670 | goto out; | |
671 | } | |
672 | ||
673 | session = l2tp_session_find_nth(tunnel, si); | |
674 | if (session == NULL) { | |
675 | ti++; | |
676 | tunnel = NULL; | |
677 | si = 0; | |
678 | continue; | |
679 | } | |
680 | ||
681 | if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).pid, | |
682 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
683 | session) <= 0) | |
684 | break; | |
685 | ||
686 | si++; | |
687 | } | |
688 | ||
689 | out: | |
690 | cb->args[0] = ti; | |
691 | cb->args[1] = si; | |
692 | ||
693 | return skb->len; | |
694 | } | |
695 | ||
696 | static struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = { | |
697 | [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, }, | |
698 | [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, }, | |
699 | [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, }, | |
700 | [L2TP_ATTR_OFFSET] = { .type = NLA_U16, }, | |
701 | [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, }, | |
702 | [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, }, | |
703 | [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, }, | |
704 | [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, }, | |
705 | [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, }, | |
706 | [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, }, | |
707 | [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, }, | |
708 | [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, }, | |
709 | [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, }, | |
710 | [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, }, | |
711 | [L2TP_ATTR_DEBUG] = { .type = NLA_U32, }, | |
712 | [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, }, | |
713 | [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, }, | |
714 | [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, }, | |
715 | [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, }, | |
716 | [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, }, | |
717 | [L2TP_ATTR_FD] = { .type = NLA_U32, }, | |
718 | [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, }, | |
719 | [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, }, | |
720 | [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, }, | |
721 | [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, }, | |
722 | [L2TP_ATTR_MTU] = { .type = NLA_U16, }, | |
723 | [L2TP_ATTR_MRU] = { .type = NLA_U16, }, | |
724 | [L2TP_ATTR_STATS] = { .type = NLA_NESTED, }, | |
725 | [L2TP_ATTR_IFNAME] = { | |
726 | .type = NLA_NUL_STRING, | |
727 | .len = IFNAMSIZ - 1, | |
728 | }, | |
729 | [L2TP_ATTR_COOKIE] = { | |
730 | .type = NLA_BINARY, | |
731 | .len = 8, | |
732 | }, | |
733 | [L2TP_ATTR_PEER_COOKIE] = { | |
734 | .type = NLA_BINARY, | |
735 | .len = 8, | |
736 | }, | |
737 | }; | |
738 | ||
739 | static struct genl_ops l2tp_nl_ops[] = { | |
740 | { | |
741 | .cmd = L2TP_CMD_NOOP, | |
742 | .doit = l2tp_nl_cmd_noop, | |
743 | .policy = l2tp_nl_policy, | |
744 | /* can be retrieved by unprivileged users */ | |
745 | }, | |
746 | { | |
747 | .cmd = L2TP_CMD_TUNNEL_CREATE, | |
748 | .doit = l2tp_nl_cmd_tunnel_create, | |
749 | .policy = l2tp_nl_policy, | |
750 | .flags = GENL_ADMIN_PERM, | |
751 | }, | |
752 | { | |
753 | .cmd = L2TP_CMD_TUNNEL_DELETE, | |
754 | .doit = l2tp_nl_cmd_tunnel_delete, | |
755 | .policy = l2tp_nl_policy, | |
756 | .flags = GENL_ADMIN_PERM, | |
757 | }, | |
758 | { | |
759 | .cmd = L2TP_CMD_TUNNEL_MODIFY, | |
760 | .doit = l2tp_nl_cmd_tunnel_modify, | |
761 | .policy = l2tp_nl_policy, | |
762 | .flags = GENL_ADMIN_PERM, | |
763 | }, | |
764 | { | |
765 | .cmd = L2TP_CMD_TUNNEL_GET, | |
766 | .doit = l2tp_nl_cmd_tunnel_get, | |
767 | .dumpit = l2tp_nl_cmd_tunnel_dump, | |
768 | .policy = l2tp_nl_policy, | |
769 | .flags = GENL_ADMIN_PERM, | |
770 | }, | |
771 | { | |
772 | .cmd = L2TP_CMD_SESSION_CREATE, | |
773 | .doit = l2tp_nl_cmd_session_create, | |
774 | .policy = l2tp_nl_policy, | |
775 | .flags = GENL_ADMIN_PERM, | |
776 | }, | |
777 | { | |
778 | .cmd = L2TP_CMD_SESSION_DELETE, | |
779 | .doit = l2tp_nl_cmd_session_delete, | |
780 | .policy = l2tp_nl_policy, | |
781 | .flags = GENL_ADMIN_PERM, | |
782 | }, | |
783 | { | |
784 | .cmd = L2TP_CMD_SESSION_MODIFY, | |
785 | .doit = l2tp_nl_cmd_session_modify, | |
786 | .policy = l2tp_nl_policy, | |
787 | .flags = GENL_ADMIN_PERM, | |
788 | }, | |
789 | { | |
790 | .cmd = L2TP_CMD_SESSION_GET, | |
791 | .doit = l2tp_nl_cmd_session_get, | |
792 | .dumpit = l2tp_nl_cmd_session_dump, | |
793 | .policy = l2tp_nl_policy, | |
794 | .flags = GENL_ADMIN_PERM, | |
795 | }, | |
796 | }; | |
797 | ||
798 | int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops) | |
799 | { | |
800 | int ret; | |
801 | ||
802 | ret = -EINVAL; | |
803 | if (pw_type >= __L2TP_PWTYPE_MAX) | |
804 | goto err; | |
805 | ||
806 | genl_lock(); | |
807 | ret = -EBUSY; | |
808 | if (l2tp_nl_cmd_ops[pw_type]) | |
809 | goto out; | |
810 | ||
811 | l2tp_nl_cmd_ops[pw_type] = ops; | |
8cb49014 | 812 | ret = 0; |
309795f4 JC |
813 | |
814 | out: | |
815 | genl_unlock(); | |
816 | err: | |
8cb49014 | 817 | return ret; |
309795f4 JC |
818 | } |
819 | EXPORT_SYMBOL_GPL(l2tp_nl_register_ops); | |
820 | ||
821 | void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type) | |
822 | { | |
823 | if (pw_type < __L2TP_PWTYPE_MAX) { | |
824 | genl_lock(); | |
825 | l2tp_nl_cmd_ops[pw_type] = NULL; | |
826 | genl_unlock(); | |
827 | } | |
828 | } | |
829 | EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops); | |
830 | ||
831 | static int l2tp_nl_init(void) | |
832 | { | |
833 | int err; | |
834 | ||
835 | printk(KERN_INFO "L2TP netlink interface\n"); | |
836 | err = genl_register_family_with_ops(&l2tp_nl_family, l2tp_nl_ops, | |
837 | ARRAY_SIZE(l2tp_nl_ops)); | |
838 | ||
839 | return err; | |
840 | } | |
841 | ||
842 | static void l2tp_nl_cleanup(void) | |
843 | { | |
844 | genl_unregister_family(&l2tp_nl_family); | |
845 | } | |
846 | ||
847 | module_init(l2tp_nl_init); | |
848 | module_exit(l2tp_nl_cleanup); | |
849 | ||
850 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
851 | MODULE_DESCRIPTION("L2TP netlink"); | |
852 | MODULE_LICENSE("GPL"); | |
853 | MODULE_VERSION("1.0"); | |
854 | MODULE_ALIAS("net-pf-" __stringify(PF_NETLINK) "-proto-" \ | |
f481c0d8 | 855 | __stringify(NETLINK_GENERIC) "-type-" "l2tp"); |