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 { | |
f9bac8df CE |
136 | #if IS_ENABLED(CONFIG_IPV6) |
137 | if (info->attrs[L2TP_ATTR_IP6_SADDR] && | |
138 | info->attrs[L2TP_ATTR_IP6_DADDR]) { | |
139 | cfg.local_ip6 = nla_data( | |
140 | info->attrs[L2TP_ATTR_IP6_SADDR]); | |
141 | cfg.peer_ip6 = nla_data( | |
142 | info->attrs[L2TP_ATTR_IP6_DADDR]); | |
143 | } else | |
144 | #endif | |
145 | if (info->attrs[L2TP_ATTR_IP_SADDR] && | |
146 | info->attrs[L2TP_ATTR_IP_DADDR]) { | |
147 | cfg.local_ip.s_addr = nla_get_be32( | |
148 | info->attrs[L2TP_ATTR_IP_SADDR]); | |
149 | cfg.peer_ip.s_addr = nla_get_be32( | |
150 | info->attrs[L2TP_ATTR_IP_DADDR]); | |
151 | } else { | |
152 | ret = -EINVAL; | |
153 | goto out; | |
154 | } | |
789a4a2c JC |
155 | if (info->attrs[L2TP_ATTR_UDP_SPORT]) |
156 | cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]); | |
157 | if (info->attrs[L2TP_ATTR_UDP_DPORT]) | |
158 | cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]); | |
159 | if (info->attrs[L2TP_ATTR_UDP_CSUM]) | |
160 | cfg.use_udp_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_CSUM]); | |
309795f4 | 161 | } |
309795f4 JC |
162 | |
163 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
164 | cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
165 | ||
166 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
167 | if (tunnel != NULL) { | |
168 | ret = -EEXIST; | |
169 | goto out; | |
170 | } | |
171 | ||
172 | ret = -EINVAL; | |
173 | switch (cfg.encap) { | |
174 | case L2TP_ENCAPTYPE_UDP: | |
175 | case L2TP_ENCAPTYPE_IP: | |
176 | ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id, | |
177 | peer_tunnel_id, &cfg, &tunnel); | |
178 | break; | |
179 | } | |
180 | ||
181 | out: | |
182 | return ret; | |
183 | } | |
184 | ||
185 | static int l2tp_nl_cmd_tunnel_delete(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 | (void) l2tp_tunnel_delete(tunnel); | |
205 | ||
206 | out: | |
207 | return ret; | |
208 | } | |
209 | ||
210 | static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info) | |
211 | { | |
212 | struct l2tp_tunnel *tunnel; | |
213 | u32 tunnel_id; | |
214 | int ret = 0; | |
215 | struct net *net = genl_info_net(info); | |
216 | ||
217 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { | |
218 | ret = -EINVAL; | |
219 | goto out; | |
220 | } | |
221 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
222 | ||
223 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
224 | if (tunnel == NULL) { | |
225 | ret = -ENODEV; | |
226 | goto out; | |
227 | } | |
228 | ||
229 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
230 | tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
231 | ||
232 | out: | |
233 | return ret; | |
234 | } | |
235 | ||
236 | static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 pid, u32 seq, int flags, | |
237 | struct l2tp_tunnel *tunnel) | |
238 | { | |
239 | void *hdr; | |
240 | struct nlattr *nest; | |
241 | struct sock *sk = NULL; | |
242 | struct inet_sock *inet; | |
f9bac8df CE |
243 | #if IS_ENABLED(CONFIG_IPV6) |
244 | struct ipv6_pinfo *np = NULL; | |
245 | #endif | |
5de7aee5 JC |
246 | struct l2tp_stats stats; |
247 | unsigned int start; | |
309795f4 JC |
248 | |
249 | hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags, | |
250 | L2TP_CMD_TUNNEL_GET); | |
251 | if (IS_ERR(hdr)) | |
252 | return PTR_ERR(hdr); | |
253 | ||
60aed2ab DM |
254 | if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) || |
255 | nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) || | |
256 | nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) || | |
257 | nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) || | |
258 | nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap)) | |
259 | goto nla_put_failure; | |
309795f4 JC |
260 | |
261 | nest = nla_nest_start(skb, L2TP_ATTR_STATS); | |
262 | if (nest == NULL) | |
263 | goto nla_put_failure; | |
264 | ||
5de7aee5 JC |
265 | do { |
266 | start = u64_stats_fetch_begin(&tunnel->stats.syncp); | |
267 | stats.tx_packets = tunnel->stats.tx_packets; | |
268 | stats.tx_bytes = tunnel->stats.tx_bytes; | |
269 | stats.tx_errors = tunnel->stats.tx_errors; | |
270 | stats.rx_packets = tunnel->stats.rx_packets; | |
271 | stats.rx_bytes = tunnel->stats.rx_bytes; | |
272 | stats.rx_errors = tunnel->stats.rx_errors; | |
273 | stats.rx_seq_discards = tunnel->stats.rx_seq_discards; | |
274 | stats.rx_oos_packets = tunnel->stats.rx_oos_packets; | |
275 | } while (u64_stats_fetch_retry(&tunnel->stats.syncp, start)); | |
276 | ||
277 | if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, stats.tx_packets) || | |
278 | nla_put_u64(skb, L2TP_ATTR_TX_BYTES, stats.tx_bytes) || | |
279 | nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, stats.tx_errors) || | |
280 | nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, stats.rx_packets) || | |
281 | nla_put_u64(skb, L2TP_ATTR_RX_BYTES, stats.rx_bytes) || | |
60aed2ab | 282 | nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, |
5de7aee5 | 283 | stats.rx_seq_discards) || |
60aed2ab | 284 | nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS, |
5de7aee5 JC |
285 | stats.rx_oos_packets) || |
286 | nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, stats.rx_errors)) | |
60aed2ab | 287 | goto nla_put_failure; |
309795f4 JC |
288 | nla_nest_end(skb, nest); |
289 | ||
290 | sk = tunnel->sock; | |
291 | if (!sk) | |
292 | goto out; | |
293 | ||
f9bac8df CE |
294 | #if IS_ENABLED(CONFIG_IPV6) |
295 | if (sk->sk_family == AF_INET6) | |
296 | np = inet6_sk(sk); | |
297 | #endif | |
298 | ||
309795f4 JC |
299 | inet = inet_sk(sk); |
300 | ||
301 | switch (tunnel->encap) { | |
302 | case L2TP_ENCAPTYPE_UDP: | |
60aed2ab DM |
303 | if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) || |
304 | nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)) || | |
305 | nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, | |
306 | (sk->sk_no_check != UDP_CSUM_NOXMIT))) | |
307 | goto nla_put_failure; | |
309795f4 JC |
308 | /* NOBREAK */ |
309 | case L2TP_ENCAPTYPE_IP: | |
f9bac8df CE |
310 | #if IS_ENABLED(CONFIG_IPV6) |
311 | if (np) { | |
312 | if (nla_put(skb, L2TP_ATTR_IP6_SADDR, sizeof(np->saddr), | |
313 | &np->saddr) || | |
314 | nla_put(skb, L2TP_ATTR_IP6_DADDR, sizeof(np->daddr), | |
315 | &np->daddr)) | |
316 | goto nla_put_failure; | |
317 | } else | |
318 | #endif | |
60aed2ab DM |
319 | if (nla_put_be32(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr) || |
320 | nla_put_be32(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr)) | |
321 | goto nla_put_failure; | |
309795f4 JC |
322 | break; |
323 | } | |
324 | ||
325 | out: | |
326 | return genlmsg_end(skb, hdr); | |
327 | ||
328 | nla_put_failure: | |
329 | genlmsg_cancel(skb, hdr); | |
330 | return -1; | |
331 | } | |
332 | ||
333 | static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info) | |
334 | { | |
335 | struct l2tp_tunnel *tunnel; | |
336 | struct sk_buff *msg; | |
337 | u32 tunnel_id; | |
338 | int ret = -ENOBUFS; | |
339 | struct net *net = genl_info_net(info); | |
340 | ||
341 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { | |
342 | ret = -EINVAL; | |
343 | goto out; | |
344 | } | |
345 | ||
346 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
347 | ||
348 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
349 | if (tunnel == NULL) { | |
350 | ret = -ENODEV; | |
351 | goto out; | |
352 | } | |
353 | ||
354 | msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
355 | if (!msg) { | |
356 | ret = -ENOMEM; | |
357 | goto out; | |
358 | } | |
359 | ||
360 | ret = l2tp_nl_tunnel_send(msg, info->snd_pid, info->snd_seq, | |
361 | NLM_F_ACK, tunnel); | |
362 | if (ret < 0) | |
363 | goto err_out; | |
364 | ||
365 | return genlmsg_unicast(net, msg, info->snd_pid); | |
366 | ||
367 | err_out: | |
368 | nlmsg_free(msg); | |
369 | ||
370 | out: | |
371 | return ret; | |
372 | } | |
373 | ||
374 | static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
375 | { | |
376 | int ti = cb->args[0]; | |
377 | struct l2tp_tunnel *tunnel; | |
378 | struct net *net = sock_net(skb->sk); | |
379 | ||
380 | for (;;) { | |
381 | tunnel = l2tp_tunnel_find_nth(net, ti); | |
382 | if (tunnel == NULL) | |
383 | goto out; | |
384 | ||
385 | if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).pid, | |
386 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
387 | tunnel) <= 0) | |
388 | goto out; | |
389 | ||
390 | ti++; | |
391 | } | |
392 | ||
393 | out: | |
394 | cb->args[0] = ti; | |
395 | ||
396 | return skb->len; | |
397 | } | |
398 | ||
399 | static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info) | |
400 | { | |
401 | u32 tunnel_id = 0; | |
402 | u32 session_id; | |
403 | u32 peer_session_id; | |
404 | int ret = 0; | |
405 | struct l2tp_tunnel *tunnel; | |
406 | struct l2tp_session *session; | |
407 | struct l2tp_session_cfg cfg = { 0, }; | |
408 | struct net *net = genl_info_net(info); | |
409 | ||
410 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { | |
411 | ret = -EINVAL; | |
412 | goto out; | |
413 | } | |
414 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
415 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
416 | if (!tunnel) { | |
417 | ret = -ENODEV; | |
418 | goto out; | |
419 | } | |
420 | ||
421 | if (!info->attrs[L2TP_ATTR_SESSION_ID]) { | |
422 | ret = -EINVAL; | |
423 | goto out; | |
424 | } | |
425 | session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]); | |
426 | session = l2tp_session_find(net, tunnel, session_id); | |
427 | if (session) { | |
428 | ret = -EEXIST; | |
429 | goto out; | |
430 | } | |
431 | ||
432 | if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) { | |
433 | ret = -EINVAL; | |
434 | goto out; | |
435 | } | |
436 | peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]); | |
437 | ||
438 | if (!info->attrs[L2TP_ATTR_PW_TYPE]) { | |
439 | ret = -EINVAL; | |
440 | goto out; | |
441 | } | |
442 | cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]); | |
443 | if (cfg.pw_type >= __L2TP_PWTYPE_MAX) { | |
444 | ret = -EINVAL; | |
445 | goto out; | |
446 | } | |
447 | ||
448 | if (tunnel->version > 2) { | |
449 | if (info->attrs[L2TP_ATTR_OFFSET]) | |
450 | cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]); | |
451 | ||
452 | if (info->attrs[L2TP_ATTR_DATA_SEQ]) | |
453 | cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]); | |
454 | ||
455 | cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT; | |
456 | if (info->attrs[L2TP_ATTR_L2SPEC_TYPE]) | |
457 | cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]); | |
458 | ||
459 | cfg.l2specific_len = 4; | |
460 | if (info->attrs[L2TP_ATTR_L2SPEC_LEN]) | |
461 | cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]); | |
462 | ||
463 | if (info->attrs[L2TP_ATTR_COOKIE]) { | |
464 | u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]); | |
465 | if (len > 8) { | |
466 | ret = -EINVAL; | |
467 | goto out; | |
468 | } | |
469 | cfg.cookie_len = len; | |
470 | memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len); | |
471 | } | |
472 | if (info->attrs[L2TP_ATTR_PEER_COOKIE]) { | |
473 | u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]); | |
474 | if (len > 8) { | |
475 | ret = -EINVAL; | |
476 | goto out; | |
477 | } | |
478 | cfg.peer_cookie_len = len; | |
479 | memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len); | |
480 | } | |
481 | if (info->attrs[L2TP_ATTR_IFNAME]) | |
482 | cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]); | |
483 | ||
484 | if (info->attrs[L2TP_ATTR_VLAN_ID]) | |
485 | cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]); | |
486 | } | |
487 | ||
488 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
489 | cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
490 | ||
491 | if (info->attrs[L2TP_ATTR_RECV_SEQ]) | |
492 | cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]); | |
493 | ||
494 | if (info->attrs[L2TP_ATTR_SEND_SEQ]) | |
495 | cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]); | |
496 | ||
497 | if (info->attrs[L2TP_ATTR_LNS_MODE]) | |
498 | cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]); | |
499 | ||
500 | if (info->attrs[L2TP_ATTR_RECV_TIMEOUT]) | |
501 | cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]); | |
502 | ||
503 | if (info->attrs[L2TP_ATTR_MTU]) | |
504 | cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]); | |
505 | ||
506 | if (info->attrs[L2TP_ATTR_MRU]) | |
507 | cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]); | |
508 | ||
509 | if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) || | |
510 | (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) { | |
511 | ret = -EPROTONOSUPPORT; | |
512 | goto out; | |
513 | } | |
514 | ||
515 | /* Check that pseudowire-specific params are present */ | |
516 | switch (cfg.pw_type) { | |
517 | case L2TP_PWTYPE_NONE: | |
518 | break; | |
519 | case L2TP_PWTYPE_ETH_VLAN: | |
520 | if (!info->attrs[L2TP_ATTR_VLAN_ID]) { | |
521 | ret = -EINVAL; | |
522 | goto out; | |
523 | } | |
524 | break; | |
525 | case L2TP_PWTYPE_ETH: | |
526 | break; | |
527 | case L2TP_PWTYPE_PPP: | |
528 | case L2TP_PWTYPE_PPP_AC: | |
529 | break; | |
530 | case L2TP_PWTYPE_IP: | |
531 | default: | |
532 | ret = -EPROTONOSUPPORT; | |
533 | break; | |
534 | } | |
535 | ||
536 | ret = -EPROTONOSUPPORT; | |
537 | if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create) | |
538 | ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id, | |
539 | session_id, peer_session_id, &cfg); | |
540 | ||
541 | out: | |
542 | return ret; | |
543 | } | |
544 | ||
545 | static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info) | |
546 | { | |
547 | int ret = 0; | |
548 | struct l2tp_session *session; | |
549 | u16 pw_type; | |
550 | ||
551 | session = l2tp_nl_session_find(info); | |
552 | if (session == NULL) { | |
553 | ret = -ENODEV; | |
554 | goto out; | |
555 | } | |
556 | ||
557 | pw_type = session->pwtype; | |
558 | if (pw_type < __L2TP_PWTYPE_MAX) | |
559 | if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete) | |
560 | ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session); | |
561 | ||
562 | out: | |
563 | return ret; | |
564 | } | |
565 | ||
566 | static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info) | |
567 | { | |
568 | int ret = 0; | |
569 | struct l2tp_session *session; | |
570 | ||
571 | session = l2tp_nl_session_find(info); | |
572 | if (session == NULL) { | |
573 | ret = -ENODEV; | |
574 | goto out; | |
575 | } | |
576 | ||
577 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
578 | session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
579 | ||
580 | if (info->attrs[L2TP_ATTR_DATA_SEQ]) | |
581 | session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]); | |
582 | ||
583 | if (info->attrs[L2TP_ATTR_RECV_SEQ]) | |
584 | session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]); | |
585 | ||
586 | if (info->attrs[L2TP_ATTR_SEND_SEQ]) | |
587 | session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]); | |
588 | ||
589 | if (info->attrs[L2TP_ATTR_LNS_MODE]) | |
590 | session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]); | |
591 | ||
592 | if (info->attrs[L2TP_ATTR_RECV_TIMEOUT]) | |
593 | session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]); | |
594 | ||
595 | if (info->attrs[L2TP_ATTR_MTU]) | |
596 | session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]); | |
597 | ||
598 | if (info->attrs[L2TP_ATTR_MRU]) | |
599 | session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]); | |
600 | ||
601 | out: | |
602 | return ret; | |
603 | } | |
604 | ||
605 | static int l2tp_nl_session_send(struct sk_buff *skb, u32 pid, u32 seq, int flags, | |
606 | struct l2tp_session *session) | |
607 | { | |
608 | void *hdr; | |
609 | struct nlattr *nest; | |
610 | struct l2tp_tunnel *tunnel = session->tunnel; | |
611 | struct sock *sk = NULL; | |
5de7aee5 JC |
612 | struct l2tp_stats stats; |
613 | unsigned int start; | |
309795f4 JC |
614 | |
615 | sk = tunnel->sock; | |
616 | ||
617 | hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags, L2TP_CMD_SESSION_GET); | |
618 | if (IS_ERR(hdr)) | |
619 | return PTR_ERR(hdr); | |
620 | ||
60aed2ab DM |
621 | if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) || |
622 | nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) || | |
623 | nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) || | |
624 | nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID, | |
625 | session->peer_session_id) || | |
626 | nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) || | |
627 | nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) || | |
628 | nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) || | |
629 | (session->mru && | |
630 | nla_put_u16(skb, L2TP_ATTR_MRU, session->mru))) | |
631 | goto nla_put_failure; | |
632 | ||
633 | if ((session->ifname && session->ifname[0] && | |
634 | nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) || | |
635 | (session->cookie_len && | |
636 | nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len, | |
637 | &session->cookie[0])) || | |
638 | (session->peer_cookie_len && | |
639 | nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len, | |
640 | &session->peer_cookie[0])) || | |
641 | nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) || | |
642 | nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) || | |
643 | nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) || | |
309795f4 | 644 | #ifdef CONFIG_XFRM |
60aed2ab DM |
645 | (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) && |
646 | nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) || | |
309795f4 | 647 | #endif |
60aed2ab DM |
648 | (session->reorder_timeout && |
649 | nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT, session->reorder_timeout))) | |
650 | goto nla_put_failure; | |
5de7aee5 | 651 | |
309795f4 JC |
652 | nest = nla_nest_start(skb, L2TP_ATTR_STATS); |
653 | if (nest == NULL) | |
654 | goto nla_put_failure; | |
5de7aee5 JC |
655 | |
656 | do { | |
657 | start = u64_stats_fetch_begin(&session->stats.syncp); | |
658 | stats.tx_packets = session->stats.tx_packets; | |
659 | stats.tx_bytes = session->stats.tx_bytes; | |
660 | stats.tx_errors = session->stats.tx_errors; | |
661 | stats.rx_packets = session->stats.rx_packets; | |
662 | stats.rx_bytes = session->stats.rx_bytes; | |
663 | stats.rx_errors = session->stats.rx_errors; | |
664 | stats.rx_seq_discards = session->stats.rx_seq_discards; | |
665 | stats.rx_oos_packets = session->stats.rx_oos_packets; | |
666 | } while (u64_stats_fetch_retry(&session->stats.syncp, start)); | |
667 | ||
668 | if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, stats.tx_packets) || | |
669 | nla_put_u64(skb, L2TP_ATTR_TX_BYTES, stats.tx_bytes) || | |
670 | nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, stats.tx_errors) || | |
671 | nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, stats.rx_packets) || | |
672 | nla_put_u64(skb, L2TP_ATTR_RX_BYTES, stats.rx_bytes) || | |
60aed2ab | 673 | nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, |
5de7aee5 | 674 | stats.rx_seq_discards) || |
60aed2ab | 675 | nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS, |
5de7aee5 JC |
676 | stats.rx_oos_packets) || |
677 | nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, stats.rx_errors)) | |
60aed2ab | 678 | goto nla_put_failure; |
309795f4 JC |
679 | nla_nest_end(skb, nest); |
680 | ||
681 | return genlmsg_end(skb, hdr); | |
682 | ||
683 | nla_put_failure: | |
684 | genlmsg_cancel(skb, hdr); | |
685 | return -1; | |
686 | } | |
687 | ||
688 | static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info) | |
689 | { | |
690 | struct l2tp_session *session; | |
691 | struct sk_buff *msg; | |
692 | int ret; | |
693 | ||
694 | session = l2tp_nl_session_find(info); | |
695 | if (session == NULL) { | |
696 | ret = -ENODEV; | |
697 | goto out; | |
698 | } | |
699 | ||
700 | msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
701 | if (!msg) { | |
702 | ret = -ENOMEM; | |
703 | goto out; | |
704 | } | |
705 | ||
706 | ret = l2tp_nl_session_send(msg, info->snd_pid, info->snd_seq, | |
707 | 0, session); | |
708 | if (ret < 0) | |
709 | goto err_out; | |
710 | ||
711 | return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid); | |
712 | ||
713 | err_out: | |
714 | nlmsg_free(msg); | |
715 | ||
716 | out: | |
717 | return ret; | |
718 | } | |
719 | ||
720 | static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
721 | { | |
722 | struct net *net = sock_net(skb->sk); | |
723 | struct l2tp_session *session; | |
724 | struct l2tp_tunnel *tunnel = NULL; | |
725 | int ti = cb->args[0]; | |
726 | int si = cb->args[1]; | |
727 | ||
728 | for (;;) { | |
729 | if (tunnel == NULL) { | |
730 | tunnel = l2tp_tunnel_find_nth(net, ti); | |
731 | if (tunnel == NULL) | |
732 | goto out; | |
733 | } | |
734 | ||
735 | session = l2tp_session_find_nth(tunnel, si); | |
736 | if (session == NULL) { | |
737 | ti++; | |
738 | tunnel = NULL; | |
739 | si = 0; | |
740 | continue; | |
741 | } | |
742 | ||
743 | if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).pid, | |
744 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
745 | session) <= 0) | |
746 | break; | |
747 | ||
748 | si++; | |
749 | } | |
750 | ||
751 | out: | |
752 | cb->args[0] = ti; | |
753 | cb->args[1] = si; | |
754 | ||
755 | return skb->len; | |
756 | } | |
757 | ||
758 | static struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = { | |
759 | [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, }, | |
760 | [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, }, | |
761 | [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, }, | |
762 | [L2TP_ATTR_OFFSET] = { .type = NLA_U16, }, | |
763 | [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, }, | |
764 | [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, }, | |
765 | [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, }, | |
766 | [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, }, | |
767 | [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, }, | |
768 | [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, }, | |
769 | [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, }, | |
770 | [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, }, | |
771 | [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, }, | |
772 | [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, }, | |
773 | [L2TP_ATTR_DEBUG] = { .type = NLA_U32, }, | |
774 | [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, }, | |
775 | [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, }, | |
776 | [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, }, | |
777 | [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, }, | |
778 | [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, }, | |
779 | [L2TP_ATTR_FD] = { .type = NLA_U32, }, | |
780 | [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, }, | |
781 | [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, }, | |
782 | [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, }, | |
783 | [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, }, | |
784 | [L2TP_ATTR_MTU] = { .type = NLA_U16, }, | |
785 | [L2TP_ATTR_MRU] = { .type = NLA_U16, }, | |
786 | [L2TP_ATTR_STATS] = { .type = NLA_NESTED, }, | |
f9bac8df CE |
787 | [L2TP_ATTR_IP6_SADDR] = { |
788 | .type = NLA_BINARY, | |
789 | .len = sizeof(struct in6_addr), | |
790 | }, | |
791 | [L2TP_ATTR_IP6_DADDR] = { | |
792 | .type = NLA_BINARY, | |
793 | .len = sizeof(struct in6_addr), | |
794 | }, | |
309795f4 JC |
795 | [L2TP_ATTR_IFNAME] = { |
796 | .type = NLA_NUL_STRING, | |
797 | .len = IFNAMSIZ - 1, | |
798 | }, | |
799 | [L2TP_ATTR_COOKIE] = { | |
800 | .type = NLA_BINARY, | |
801 | .len = 8, | |
802 | }, | |
803 | [L2TP_ATTR_PEER_COOKIE] = { | |
804 | .type = NLA_BINARY, | |
805 | .len = 8, | |
806 | }, | |
807 | }; | |
808 | ||
809 | static struct genl_ops l2tp_nl_ops[] = { | |
810 | { | |
811 | .cmd = L2TP_CMD_NOOP, | |
812 | .doit = l2tp_nl_cmd_noop, | |
813 | .policy = l2tp_nl_policy, | |
814 | /* can be retrieved by unprivileged users */ | |
815 | }, | |
816 | { | |
817 | .cmd = L2TP_CMD_TUNNEL_CREATE, | |
818 | .doit = l2tp_nl_cmd_tunnel_create, | |
819 | .policy = l2tp_nl_policy, | |
820 | .flags = GENL_ADMIN_PERM, | |
821 | }, | |
822 | { | |
823 | .cmd = L2TP_CMD_TUNNEL_DELETE, | |
824 | .doit = l2tp_nl_cmd_tunnel_delete, | |
825 | .policy = l2tp_nl_policy, | |
826 | .flags = GENL_ADMIN_PERM, | |
827 | }, | |
828 | { | |
829 | .cmd = L2TP_CMD_TUNNEL_MODIFY, | |
830 | .doit = l2tp_nl_cmd_tunnel_modify, | |
831 | .policy = l2tp_nl_policy, | |
832 | .flags = GENL_ADMIN_PERM, | |
833 | }, | |
834 | { | |
835 | .cmd = L2TP_CMD_TUNNEL_GET, | |
836 | .doit = l2tp_nl_cmd_tunnel_get, | |
837 | .dumpit = l2tp_nl_cmd_tunnel_dump, | |
838 | .policy = l2tp_nl_policy, | |
839 | .flags = GENL_ADMIN_PERM, | |
840 | }, | |
841 | { | |
842 | .cmd = L2TP_CMD_SESSION_CREATE, | |
843 | .doit = l2tp_nl_cmd_session_create, | |
844 | .policy = l2tp_nl_policy, | |
845 | .flags = GENL_ADMIN_PERM, | |
846 | }, | |
847 | { | |
848 | .cmd = L2TP_CMD_SESSION_DELETE, | |
849 | .doit = l2tp_nl_cmd_session_delete, | |
850 | .policy = l2tp_nl_policy, | |
851 | .flags = GENL_ADMIN_PERM, | |
852 | }, | |
853 | { | |
854 | .cmd = L2TP_CMD_SESSION_MODIFY, | |
855 | .doit = l2tp_nl_cmd_session_modify, | |
856 | .policy = l2tp_nl_policy, | |
857 | .flags = GENL_ADMIN_PERM, | |
858 | }, | |
859 | { | |
860 | .cmd = L2TP_CMD_SESSION_GET, | |
861 | .doit = l2tp_nl_cmd_session_get, | |
862 | .dumpit = l2tp_nl_cmd_session_dump, | |
863 | .policy = l2tp_nl_policy, | |
864 | .flags = GENL_ADMIN_PERM, | |
865 | }, | |
866 | }; | |
867 | ||
868 | int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops) | |
869 | { | |
870 | int ret; | |
871 | ||
872 | ret = -EINVAL; | |
873 | if (pw_type >= __L2TP_PWTYPE_MAX) | |
874 | goto err; | |
875 | ||
876 | genl_lock(); | |
877 | ret = -EBUSY; | |
878 | if (l2tp_nl_cmd_ops[pw_type]) | |
879 | goto out; | |
880 | ||
881 | l2tp_nl_cmd_ops[pw_type] = ops; | |
8cb49014 | 882 | ret = 0; |
309795f4 JC |
883 | |
884 | out: | |
885 | genl_unlock(); | |
886 | err: | |
8cb49014 | 887 | return ret; |
309795f4 JC |
888 | } |
889 | EXPORT_SYMBOL_GPL(l2tp_nl_register_ops); | |
890 | ||
891 | void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type) | |
892 | { | |
893 | if (pw_type < __L2TP_PWTYPE_MAX) { | |
894 | genl_lock(); | |
895 | l2tp_nl_cmd_ops[pw_type] = NULL; | |
896 | genl_unlock(); | |
897 | } | |
898 | } | |
899 | EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops); | |
900 | ||
901 | static int l2tp_nl_init(void) | |
902 | { | |
903 | int err; | |
904 | ||
905 | printk(KERN_INFO "L2TP netlink interface\n"); | |
906 | err = genl_register_family_with_ops(&l2tp_nl_family, l2tp_nl_ops, | |
907 | ARRAY_SIZE(l2tp_nl_ops)); | |
908 | ||
909 | return err; | |
910 | } | |
911 | ||
912 | static void l2tp_nl_cleanup(void) | |
913 | { | |
914 | genl_unregister_family(&l2tp_nl_family); | |
915 | } | |
916 | ||
917 | module_init(l2tp_nl_init); | |
918 | module_exit(l2tp_nl_cleanup); | |
919 | ||
920 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
921 | MODULE_DESCRIPTION("L2TP netlink"); | |
922 | MODULE_LICENSE("GPL"); | |
923 | MODULE_VERSION("1.0"); | |
924 | MODULE_ALIAS("net-pf-" __stringify(PF_NETLINK) "-proto-" \ | |
f481c0d8 | 925 | __stringify(NETLINK_GENERIC) "-type-" "l2tp"); |