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 | ||
a4ca44fa JP |
17 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
18 | ||
309795f4 JC |
19 | #include <net/sock.h> |
20 | #include <net/genetlink.h> | |
21 | #include <net/udp.h> | |
22 | #include <linux/in.h> | |
23 | #include <linux/udp.h> | |
24 | #include <linux/socket.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/list.h> | |
27 | #include <net/net_namespace.h> | |
28 | ||
29 | #include <linux/l2tp.h> | |
30 | ||
31 | #include "l2tp_core.h" | |
32 | ||
33 | ||
34 | static struct genl_family l2tp_nl_family = { | |
35 | .id = GENL_ID_GENERATE, | |
36 | .name = L2TP_GENL_NAME, | |
37 | .version = L2TP_GENL_VERSION, | |
38 | .hdrsize = 0, | |
39 | .maxattr = L2TP_ATTR_MAX, | |
40 | }; | |
41 | ||
42 | /* Accessed under genl lock */ | |
43 | static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX]; | |
44 | ||
45 | static struct l2tp_session *l2tp_nl_session_find(struct genl_info *info) | |
46 | { | |
47 | u32 tunnel_id; | |
48 | u32 session_id; | |
49 | char *ifname; | |
50 | struct l2tp_tunnel *tunnel; | |
51 | struct l2tp_session *session = NULL; | |
52 | struct net *net = genl_info_net(info); | |
53 | ||
54 | if (info->attrs[L2TP_ATTR_IFNAME]) { | |
55 | ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]); | |
56 | session = l2tp_session_find_by_ifname(net, ifname); | |
57 | } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) && | |
58 | (info->attrs[L2TP_ATTR_CONN_ID])) { | |
59 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
60 | session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]); | |
61 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
62 | if (tunnel) | |
63 | session = l2tp_session_find(net, tunnel, session_id); | |
64 | } | |
65 | ||
66 | return session; | |
67 | } | |
68 | ||
69 | static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info) | |
70 | { | |
71 | struct sk_buff *msg; | |
72 | void *hdr; | |
73 | int ret = -ENOBUFS; | |
74 | ||
58050fce | 75 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
309795f4 JC |
76 | if (!msg) { |
77 | ret = -ENOMEM; | |
78 | goto out; | |
79 | } | |
80 | ||
81 | hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq, | |
82 | &l2tp_nl_family, 0, L2TP_CMD_NOOP); | |
83 | if (IS_ERR(hdr)) { | |
84 | ret = PTR_ERR(hdr); | |
85 | goto err_out; | |
86 | } | |
87 | ||
88 | genlmsg_end(msg, hdr); | |
89 | ||
90 | return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid); | |
91 | ||
92 | err_out: | |
93 | nlmsg_free(msg); | |
94 | ||
95 | out: | |
96 | return ret; | |
97 | } | |
98 | ||
99 | static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info) | |
100 | { | |
101 | u32 tunnel_id; | |
102 | u32 peer_tunnel_id; | |
103 | int proto_version; | |
104 | int fd; | |
105 | int ret = 0; | |
106 | struct l2tp_tunnel_cfg cfg = { 0, }; | |
107 | struct l2tp_tunnel *tunnel; | |
108 | struct net *net = genl_info_net(info); | |
109 | ||
110 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { | |
111 | ret = -EINVAL; | |
112 | goto out; | |
113 | } | |
114 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
115 | ||
116 | if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) { | |
117 | ret = -EINVAL; | |
118 | goto out; | |
119 | } | |
120 | peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]); | |
121 | ||
122 | if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) { | |
123 | ret = -EINVAL; | |
124 | goto out; | |
125 | } | |
126 | proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]); | |
127 | ||
128 | if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) { | |
129 | ret = -EINVAL; | |
130 | goto out; | |
131 | } | |
132 | cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]); | |
133 | ||
789a4a2c JC |
134 | fd = -1; |
135 | if (info->attrs[L2TP_ATTR_FD]) { | |
136 | fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]); | |
137 | } else { | |
f9bac8df CE |
138 | #if IS_ENABLED(CONFIG_IPV6) |
139 | if (info->attrs[L2TP_ATTR_IP6_SADDR] && | |
140 | info->attrs[L2TP_ATTR_IP6_DADDR]) { | |
141 | cfg.local_ip6 = nla_data( | |
142 | info->attrs[L2TP_ATTR_IP6_SADDR]); | |
143 | cfg.peer_ip6 = nla_data( | |
144 | info->attrs[L2TP_ATTR_IP6_DADDR]); | |
145 | } else | |
146 | #endif | |
147 | if (info->attrs[L2TP_ATTR_IP_SADDR] && | |
148 | info->attrs[L2TP_ATTR_IP_DADDR]) { | |
149 | cfg.local_ip.s_addr = nla_get_be32( | |
150 | info->attrs[L2TP_ATTR_IP_SADDR]); | |
151 | cfg.peer_ip.s_addr = nla_get_be32( | |
152 | info->attrs[L2TP_ATTR_IP_DADDR]); | |
153 | } else { | |
154 | ret = -EINVAL; | |
155 | goto out; | |
156 | } | |
789a4a2c JC |
157 | if (info->attrs[L2TP_ATTR_UDP_SPORT]) |
158 | cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]); | |
159 | if (info->attrs[L2TP_ATTR_UDP_DPORT]) | |
160 | cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]); | |
161 | if (info->attrs[L2TP_ATTR_UDP_CSUM]) | |
162 | cfg.use_udp_checksums = nla_get_flag(info->attrs[L2TP_ATTR_UDP_CSUM]); | |
309795f4 | 163 | } |
309795f4 JC |
164 | |
165 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
166 | cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
167 | ||
168 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
169 | if (tunnel != NULL) { | |
170 | ret = -EEXIST; | |
171 | goto out; | |
172 | } | |
173 | ||
174 | ret = -EINVAL; | |
175 | switch (cfg.encap) { | |
176 | case L2TP_ENCAPTYPE_UDP: | |
177 | case L2TP_ENCAPTYPE_IP: | |
178 | ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id, | |
179 | peer_tunnel_id, &cfg, &tunnel); | |
180 | break; | |
181 | } | |
182 | ||
183 | out: | |
184 | return ret; | |
185 | } | |
186 | ||
187 | static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info) | |
188 | { | |
189 | struct l2tp_tunnel *tunnel; | |
190 | u32 tunnel_id; | |
191 | int ret = 0; | |
192 | struct net *net = genl_info_net(info); | |
193 | ||
194 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { | |
195 | ret = -EINVAL; | |
196 | goto out; | |
197 | } | |
198 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
199 | ||
200 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
201 | if (tunnel == NULL) { | |
202 | ret = -ENODEV; | |
203 | goto out; | |
204 | } | |
205 | ||
206 | (void) l2tp_tunnel_delete(tunnel); | |
207 | ||
208 | out: | |
209 | return ret; | |
210 | } | |
211 | ||
212 | static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info) | |
213 | { | |
214 | struct l2tp_tunnel *tunnel; | |
215 | u32 tunnel_id; | |
216 | int ret = 0; | |
217 | struct net *net = genl_info_net(info); | |
218 | ||
219 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { | |
220 | ret = -EINVAL; | |
221 | goto out; | |
222 | } | |
223 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
224 | ||
225 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
226 | if (tunnel == NULL) { | |
227 | ret = -ENODEV; | |
228 | goto out; | |
229 | } | |
230 | ||
231 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
232 | tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
233 | ||
234 | out: | |
235 | return ret; | |
236 | } | |
237 | ||
238 | static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 pid, u32 seq, int flags, | |
239 | struct l2tp_tunnel *tunnel) | |
240 | { | |
241 | void *hdr; | |
242 | struct nlattr *nest; | |
243 | struct sock *sk = NULL; | |
244 | struct inet_sock *inet; | |
f9bac8df CE |
245 | #if IS_ENABLED(CONFIG_IPV6) |
246 | struct ipv6_pinfo *np = NULL; | |
247 | #endif | |
5de7aee5 JC |
248 | struct l2tp_stats stats; |
249 | unsigned int start; | |
309795f4 JC |
250 | |
251 | hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags, | |
252 | L2TP_CMD_TUNNEL_GET); | |
253 | if (IS_ERR(hdr)) | |
254 | return PTR_ERR(hdr); | |
255 | ||
60aed2ab DM |
256 | if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) || |
257 | nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) || | |
258 | nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) || | |
259 | nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) || | |
260 | nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap)) | |
261 | goto nla_put_failure; | |
309795f4 JC |
262 | |
263 | nest = nla_nest_start(skb, L2TP_ATTR_STATS); | |
264 | if (nest == NULL) | |
265 | goto nla_put_failure; | |
266 | ||
5de7aee5 JC |
267 | do { |
268 | start = u64_stats_fetch_begin(&tunnel->stats.syncp); | |
269 | stats.tx_packets = tunnel->stats.tx_packets; | |
270 | stats.tx_bytes = tunnel->stats.tx_bytes; | |
271 | stats.tx_errors = tunnel->stats.tx_errors; | |
272 | stats.rx_packets = tunnel->stats.rx_packets; | |
273 | stats.rx_bytes = tunnel->stats.rx_bytes; | |
274 | stats.rx_errors = tunnel->stats.rx_errors; | |
275 | stats.rx_seq_discards = tunnel->stats.rx_seq_discards; | |
276 | stats.rx_oos_packets = tunnel->stats.rx_oos_packets; | |
277 | } while (u64_stats_fetch_retry(&tunnel->stats.syncp, start)); | |
278 | ||
279 | if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, stats.tx_packets) || | |
280 | nla_put_u64(skb, L2TP_ATTR_TX_BYTES, stats.tx_bytes) || | |
281 | nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, stats.tx_errors) || | |
282 | nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, stats.rx_packets) || | |
283 | nla_put_u64(skb, L2TP_ATTR_RX_BYTES, stats.rx_bytes) || | |
60aed2ab | 284 | nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, |
5de7aee5 | 285 | stats.rx_seq_discards) || |
60aed2ab | 286 | nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS, |
5de7aee5 JC |
287 | stats.rx_oos_packets) || |
288 | nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, stats.rx_errors)) | |
60aed2ab | 289 | goto nla_put_failure; |
309795f4 JC |
290 | nla_nest_end(skb, nest); |
291 | ||
292 | sk = tunnel->sock; | |
293 | if (!sk) | |
294 | goto out; | |
295 | ||
f9bac8df CE |
296 | #if IS_ENABLED(CONFIG_IPV6) |
297 | if (sk->sk_family == AF_INET6) | |
298 | np = inet6_sk(sk); | |
299 | #endif | |
300 | ||
309795f4 JC |
301 | inet = inet_sk(sk); |
302 | ||
303 | switch (tunnel->encap) { | |
304 | case L2TP_ENCAPTYPE_UDP: | |
60aed2ab DM |
305 | if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) || |
306 | nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)) || | |
307 | nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, | |
308 | (sk->sk_no_check != UDP_CSUM_NOXMIT))) | |
309 | goto nla_put_failure; | |
309795f4 JC |
310 | /* NOBREAK */ |
311 | case L2TP_ENCAPTYPE_IP: | |
f9bac8df CE |
312 | #if IS_ENABLED(CONFIG_IPV6) |
313 | if (np) { | |
314 | if (nla_put(skb, L2TP_ATTR_IP6_SADDR, sizeof(np->saddr), | |
315 | &np->saddr) || | |
316 | nla_put(skb, L2TP_ATTR_IP6_DADDR, sizeof(np->daddr), | |
317 | &np->daddr)) | |
318 | goto nla_put_failure; | |
319 | } else | |
320 | #endif | |
60aed2ab DM |
321 | if (nla_put_be32(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr) || |
322 | nla_put_be32(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr)) | |
323 | goto nla_put_failure; | |
309795f4 JC |
324 | break; |
325 | } | |
326 | ||
327 | out: | |
328 | return genlmsg_end(skb, hdr); | |
329 | ||
330 | nla_put_failure: | |
331 | genlmsg_cancel(skb, hdr); | |
332 | return -1; | |
333 | } | |
334 | ||
335 | static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info) | |
336 | { | |
337 | struct l2tp_tunnel *tunnel; | |
338 | struct sk_buff *msg; | |
339 | u32 tunnel_id; | |
340 | int ret = -ENOBUFS; | |
341 | struct net *net = genl_info_net(info); | |
342 | ||
343 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { | |
344 | ret = -EINVAL; | |
345 | goto out; | |
346 | } | |
347 | ||
348 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
349 | ||
350 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
351 | if (tunnel == NULL) { | |
352 | ret = -ENODEV; | |
353 | goto out; | |
354 | } | |
355 | ||
58050fce | 356 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
309795f4 JC |
357 | if (!msg) { |
358 | ret = -ENOMEM; | |
359 | goto out; | |
360 | } | |
361 | ||
362 | ret = l2tp_nl_tunnel_send(msg, info->snd_pid, info->snd_seq, | |
363 | NLM_F_ACK, tunnel); | |
364 | if (ret < 0) | |
365 | goto err_out; | |
366 | ||
367 | return genlmsg_unicast(net, msg, info->snd_pid); | |
368 | ||
369 | err_out: | |
370 | nlmsg_free(msg); | |
371 | ||
372 | out: | |
373 | return ret; | |
374 | } | |
375 | ||
376 | static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
377 | { | |
378 | int ti = cb->args[0]; | |
379 | struct l2tp_tunnel *tunnel; | |
380 | struct net *net = sock_net(skb->sk); | |
381 | ||
382 | for (;;) { | |
383 | tunnel = l2tp_tunnel_find_nth(net, ti); | |
384 | if (tunnel == NULL) | |
385 | goto out; | |
386 | ||
387 | if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).pid, | |
388 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
389 | tunnel) <= 0) | |
390 | goto out; | |
391 | ||
392 | ti++; | |
393 | } | |
394 | ||
395 | out: | |
396 | cb->args[0] = ti; | |
397 | ||
398 | return skb->len; | |
399 | } | |
400 | ||
401 | static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info) | |
402 | { | |
403 | u32 tunnel_id = 0; | |
404 | u32 session_id; | |
405 | u32 peer_session_id; | |
406 | int ret = 0; | |
407 | struct l2tp_tunnel *tunnel; | |
408 | struct l2tp_session *session; | |
409 | struct l2tp_session_cfg cfg = { 0, }; | |
410 | struct net *net = genl_info_net(info); | |
411 | ||
412 | if (!info->attrs[L2TP_ATTR_CONN_ID]) { | |
413 | ret = -EINVAL; | |
414 | goto out; | |
415 | } | |
416 | tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]); | |
417 | tunnel = l2tp_tunnel_find(net, tunnel_id); | |
418 | if (!tunnel) { | |
419 | ret = -ENODEV; | |
420 | goto out; | |
421 | } | |
422 | ||
423 | if (!info->attrs[L2TP_ATTR_SESSION_ID]) { | |
424 | ret = -EINVAL; | |
425 | goto out; | |
426 | } | |
427 | session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]); | |
428 | session = l2tp_session_find(net, tunnel, session_id); | |
429 | if (session) { | |
430 | ret = -EEXIST; | |
431 | goto out; | |
432 | } | |
433 | ||
434 | if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) { | |
435 | ret = -EINVAL; | |
436 | goto out; | |
437 | } | |
438 | peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]); | |
439 | ||
440 | if (!info->attrs[L2TP_ATTR_PW_TYPE]) { | |
441 | ret = -EINVAL; | |
442 | goto out; | |
443 | } | |
444 | cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]); | |
445 | if (cfg.pw_type >= __L2TP_PWTYPE_MAX) { | |
446 | ret = -EINVAL; | |
447 | goto out; | |
448 | } | |
449 | ||
450 | if (tunnel->version > 2) { | |
451 | if (info->attrs[L2TP_ATTR_OFFSET]) | |
452 | cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]); | |
453 | ||
454 | if (info->attrs[L2TP_ATTR_DATA_SEQ]) | |
455 | cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]); | |
456 | ||
457 | cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT; | |
458 | if (info->attrs[L2TP_ATTR_L2SPEC_TYPE]) | |
459 | cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]); | |
460 | ||
461 | cfg.l2specific_len = 4; | |
462 | if (info->attrs[L2TP_ATTR_L2SPEC_LEN]) | |
463 | cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]); | |
464 | ||
465 | if (info->attrs[L2TP_ATTR_COOKIE]) { | |
466 | u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]); | |
467 | if (len > 8) { | |
468 | ret = -EINVAL; | |
469 | goto out; | |
470 | } | |
471 | cfg.cookie_len = len; | |
472 | memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len); | |
473 | } | |
474 | if (info->attrs[L2TP_ATTR_PEER_COOKIE]) { | |
475 | u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]); | |
476 | if (len > 8) { | |
477 | ret = -EINVAL; | |
478 | goto out; | |
479 | } | |
480 | cfg.peer_cookie_len = len; | |
481 | memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len); | |
482 | } | |
483 | if (info->attrs[L2TP_ATTR_IFNAME]) | |
484 | cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]); | |
485 | ||
486 | if (info->attrs[L2TP_ATTR_VLAN_ID]) | |
487 | cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]); | |
488 | } | |
489 | ||
490 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
491 | cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
492 | ||
493 | if (info->attrs[L2TP_ATTR_RECV_SEQ]) | |
494 | cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]); | |
495 | ||
496 | if (info->attrs[L2TP_ATTR_SEND_SEQ]) | |
497 | cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]); | |
498 | ||
499 | if (info->attrs[L2TP_ATTR_LNS_MODE]) | |
500 | cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]); | |
501 | ||
502 | if (info->attrs[L2TP_ATTR_RECV_TIMEOUT]) | |
503 | cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]); | |
504 | ||
505 | if (info->attrs[L2TP_ATTR_MTU]) | |
506 | cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]); | |
507 | ||
508 | if (info->attrs[L2TP_ATTR_MRU]) | |
509 | cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]); | |
510 | ||
511 | if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) || | |
512 | (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) { | |
513 | ret = -EPROTONOSUPPORT; | |
514 | goto out; | |
515 | } | |
516 | ||
517 | /* Check that pseudowire-specific params are present */ | |
518 | switch (cfg.pw_type) { | |
519 | case L2TP_PWTYPE_NONE: | |
520 | break; | |
521 | case L2TP_PWTYPE_ETH_VLAN: | |
522 | if (!info->attrs[L2TP_ATTR_VLAN_ID]) { | |
523 | ret = -EINVAL; | |
524 | goto out; | |
525 | } | |
526 | break; | |
527 | case L2TP_PWTYPE_ETH: | |
528 | break; | |
529 | case L2TP_PWTYPE_PPP: | |
530 | case L2TP_PWTYPE_PPP_AC: | |
531 | break; | |
532 | case L2TP_PWTYPE_IP: | |
533 | default: | |
534 | ret = -EPROTONOSUPPORT; | |
535 | break; | |
536 | } | |
537 | ||
538 | ret = -EPROTONOSUPPORT; | |
539 | if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create) | |
540 | ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id, | |
541 | session_id, peer_session_id, &cfg); | |
542 | ||
543 | out: | |
544 | return ret; | |
545 | } | |
546 | ||
547 | static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info) | |
548 | { | |
549 | int ret = 0; | |
550 | struct l2tp_session *session; | |
551 | u16 pw_type; | |
552 | ||
553 | session = l2tp_nl_session_find(info); | |
554 | if (session == NULL) { | |
555 | ret = -ENODEV; | |
556 | goto out; | |
557 | } | |
558 | ||
559 | pw_type = session->pwtype; | |
560 | if (pw_type < __L2TP_PWTYPE_MAX) | |
561 | if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete) | |
562 | ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session); | |
563 | ||
564 | out: | |
565 | return ret; | |
566 | } | |
567 | ||
568 | static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info) | |
569 | { | |
570 | int ret = 0; | |
571 | struct l2tp_session *session; | |
572 | ||
573 | session = l2tp_nl_session_find(info); | |
574 | if (session == NULL) { | |
575 | ret = -ENODEV; | |
576 | goto out; | |
577 | } | |
578 | ||
579 | if (info->attrs[L2TP_ATTR_DEBUG]) | |
580 | session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]); | |
581 | ||
582 | if (info->attrs[L2TP_ATTR_DATA_SEQ]) | |
583 | session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]); | |
584 | ||
585 | if (info->attrs[L2TP_ATTR_RECV_SEQ]) | |
586 | session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]); | |
587 | ||
588 | if (info->attrs[L2TP_ATTR_SEND_SEQ]) | |
589 | session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]); | |
590 | ||
591 | if (info->attrs[L2TP_ATTR_LNS_MODE]) | |
592 | session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]); | |
593 | ||
594 | if (info->attrs[L2TP_ATTR_RECV_TIMEOUT]) | |
595 | session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]); | |
596 | ||
597 | if (info->attrs[L2TP_ATTR_MTU]) | |
598 | session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]); | |
599 | ||
600 | if (info->attrs[L2TP_ATTR_MRU]) | |
601 | session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]); | |
602 | ||
603 | out: | |
604 | return ret; | |
605 | } | |
606 | ||
607 | static int l2tp_nl_session_send(struct sk_buff *skb, u32 pid, u32 seq, int flags, | |
608 | struct l2tp_session *session) | |
609 | { | |
610 | void *hdr; | |
611 | struct nlattr *nest; | |
612 | struct l2tp_tunnel *tunnel = session->tunnel; | |
613 | struct sock *sk = NULL; | |
5de7aee5 JC |
614 | struct l2tp_stats stats; |
615 | unsigned int start; | |
309795f4 JC |
616 | |
617 | sk = tunnel->sock; | |
618 | ||
619 | hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags, L2TP_CMD_SESSION_GET); | |
620 | if (IS_ERR(hdr)) | |
621 | return PTR_ERR(hdr); | |
622 | ||
60aed2ab DM |
623 | if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) || |
624 | nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) || | |
625 | nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) || | |
626 | nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID, | |
627 | session->peer_session_id) || | |
628 | nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) || | |
629 | nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) || | |
630 | nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) || | |
631 | (session->mru && | |
632 | nla_put_u16(skb, L2TP_ATTR_MRU, session->mru))) | |
633 | goto nla_put_failure; | |
634 | ||
635 | if ((session->ifname && session->ifname[0] && | |
636 | nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) || | |
637 | (session->cookie_len && | |
638 | nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len, | |
639 | &session->cookie[0])) || | |
640 | (session->peer_cookie_len && | |
641 | nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len, | |
642 | &session->peer_cookie[0])) || | |
643 | nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) || | |
644 | nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) || | |
645 | nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) || | |
309795f4 | 646 | #ifdef CONFIG_XFRM |
60aed2ab DM |
647 | (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) && |
648 | nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) || | |
309795f4 | 649 | #endif |
60aed2ab DM |
650 | (session->reorder_timeout && |
651 | nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT, session->reorder_timeout))) | |
652 | goto nla_put_failure; | |
5de7aee5 | 653 | |
309795f4 JC |
654 | nest = nla_nest_start(skb, L2TP_ATTR_STATS); |
655 | if (nest == NULL) | |
656 | goto nla_put_failure; | |
5de7aee5 JC |
657 | |
658 | do { | |
659 | start = u64_stats_fetch_begin(&session->stats.syncp); | |
660 | stats.tx_packets = session->stats.tx_packets; | |
661 | stats.tx_bytes = session->stats.tx_bytes; | |
662 | stats.tx_errors = session->stats.tx_errors; | |
663 | stats.rx_packets = session->stats.rx_packets; | |
664 | stats.rx_bytes = session->stats.rx_bytes; | |
665 | stats.rx_errors = session->stats.rx_errors; | |
666 | stats.rx_seq_discards = session->stats.rx_seq_discards; | |
667 | stats.rx_oos_packets = session->stats.rx_oos_packets; | |
668 | } while (u64_stats_fetch_retry(&session->stats.syncp, start)); | |
669 | ||
670 | if (nla_put_u64(skb, L2TP_ATTR_TX_PACKETS, stats.tx_packets) || | |
671 | nla_put_u64(skb, L2TP_ATTR_TX_BYTES, stats.tx_bytes) || | |
672 | nla_put_u64(skb, L2TP_ATTR_TX_ERRORS, stats.tx_errors) || | |
673 | nla_put_u64(skb, L2TP_ATTR_RX_PACKETS, stats.rx_packets) || | |
674 | nla_put_u64(skb, L2TP_ATTR_RX_BYTES, stats.rx_bytes) || | |
60aed2ab | 675 | nla_put_u64(skb, L2TP_ATTR_RX_SEQ_DISCARDS, |
5de7aee5 | 676 | stats.rx_seq_discards) || |
60aed2ab | 677 | nla_put_u64(skb, L2TP_ATTR_RX_OOS_PACKETS, |
5de7aee5 JC |
678 | stats.rx_oos_packets) || |
679 | nla_put_u64(skb, L2TP_ATTR_RX_ERRORS, stats.rx_errors)) | |
60aed2ab | 680 | goto nla_put_failure; |
309795f4 JC |
681 | nla_nest_end(skb, nest); |
682 | ||
683 | return genlmsg_end(skb, hdr); | |
684 | ||
685 | nla_put_failure: | |
686 | genlmsg_cancel(skb, hdr); | |
687 | return -1; | |
688 | } | |
689 | ||
690 | static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info) | |
691 | { | |
692 | struct l2tp_session *session; | |
693 | struct sk_buff *msg; | |
694 | int ret; | |
695 | ||
696 | session = l2tp_nl_session_find(info); | |
697 | if (session == NULL) { | |
698 | ret = -ENODEV; | |
699 | goto out; | |
700 | } | |
701 | ||
58050fce | 702 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
309795f4 JC |
703 | if (!msg) { |
704 | ret = -ENOMEM; | |
705 | goto out; | |
706 | } | |
707 | ||
708 | ret = l2tp_nl_session_send(msg, info->snd_pid, info->snd_seq, | |
709 | 0, session); | |
710 | if (ret < 0) | |
711 | goto err_out; | |
712 | ||
713 | return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid); | |
714 | ||
715 | err_out: | |
716 | nlmsg_free(msg); | |
717 | ||
718 | out: | |
719 | return ret; | |
720 | } | |
721 | ||
722 | static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
723 | { | |
724 | struct net *net = sock_net(skb->sk); | |
725 | struct l2tp_session *session; | |
726 | struct l2tp_tunnel *tunnel = NULL; | |
727 | int ti = cb->args[0]; | |
728 | int si = cb->args[1]; | |
729 | ||
730 | for (;;) { | |
731 | if (tunnel == NULL) { | |
732 | tunnel = l2tp_tunnel_find_nth(net, ti); | |
733 | if (tunnel == NULL) | |
734 | goto out; | |
735 | } | |
736 | ||
737 | session = l2tp_session_find_nth(tunnel, si); | |
738 | if (session == NULL) { | |
739 | ti++; | |
740 | tunnel = NULL; | |
741 | si = 0; | |
742 | continue; | |
743 | } | |
744 | ||
745 | if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).pid, | |
746 | cb->nlh->nlmsg_seq, NLM_F_MULTI, | |
747 | session) <= 0) | |
748 | break; | |
749 | ||
750 | si++; | |
751 | } | |
752 | ||
753 | out: | |
754 | cb->args[0] = ti; | |
755 | cb->args[1] = si; | |
756 | ||
757 | return skb->len; | |
758 | } | |
759 | ||
760 | static struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = { | |
761 | [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, }, | |
762 | [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, }, | |
763 | [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, }, | |
764 | [L2TP_ATTR_OFFSET] = { .type = NLA_U16, }, | |
765 | [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, }, | |
766 | [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, }, | |
767 | [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, }, | |
768 | [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, }, | |
769 | [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, }, | |
770 | [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, }, | |
771 | [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, }, | |
772 | [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, }, | |
773 | [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, }, | |
774 | [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, }, | |
775 | [L2TP_ATTR_DEBUG] = { .type = NLA_U32, }, | |
776 | [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, }, | |
777 | [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, }, | |
778 | [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, }, | |
779 | [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, }, | |
780 | [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, }, | |
781 | [L2TP_ATTR_FD] = { .type = NLA_U32, }, | |
782 | [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, }, | |
783 | [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, }, | |
784 | [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, }, | |
785 | [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, }, | |
786 | [L2TP_ATTR_MTU] = { .type = NLA_U16, }, | |
787 | [L2TP_ATTR_MRU] = { .type = NLA_U16, }, | |
788 | [L2TP_ATTR_STATS] = { .type = NLA_NESTED, }, | |
f9bac8df CE |
789 | [L2TP_ATTR_IP6_SADDR] = { |
790 | .type = NLA_BINARY, | |
791 | .len = sizeof(struct in6_addr), | |
792 | }, | |
793 | [L2TP_ATTR_IP6_DADDR] = { | |
794 | .type = NLA_BINARY, | |
795 | .len = sizeof(struct in6_addr), | |
796 | }, | |
309795f4 JC |
797 | [L2TP_ATTR_IFNAME] = { |
798 | .type = NLA_NUL_STRING, | |
799 | .len = IFNAMSIZ - 1, | |
800 | }, | |
801 | [L2TP_ATTR_COOKIE] = { | |
802 | .type = NLA_BINARY, | |
803 | .len = 8, | |
804 | }, | |
805 | [L2TP_ATTR_PEER_COOKIE] = { | |
806 | .type = NLA_BINARY, | |
807 | .len = 8, | |
808 | }, | |
809 | }; | |
810 | ||
811 | static struct genl_ops l2tp_nl_ops[] = { | |
812 | { | |
813 | .cmd = L2TP_CMD_NOOP, | |
814 | .doit = l2tp_nl_cmd_noop, | |
815 | .policy = l2tp_nl_policy, | |
816 | /* can be retrieved by unprivileged users */ | |
817 | }, | |
818 | { | |
819 | .cmd = L2TP_CMD_TUNNEL_CREATE, | |
820 | .doit = l2tp_nl_cmd_tunnel_create, | |
821 | .policy = l2tp_nl_policy, | |
822 | .flags = GENL_ADMIN_PERM, | |
823 | }, | |
824 | { | |
825 | .cmd = L2TP_CMD_TUNNEL_DELETE, | |
826 | .doit = l2tp_nl_cmd_tunnel_delete, | |
827 | .policy = l2tp_nl_policy, | |
828 | .flags = GENL_ADMIN_PERM, | |
829 | }, | |
830 | { | |
831 | .cmd = L2TP_CMD_TUNNEL_MODIFY, | |
832 | .doit = l2tp_nl_cmd_tunnel_modify, | |
833 | .policy = l2tp_nl_policy, | |
834 | .flags = GENL_ADMIN_PERM, | |
835 | }, | |
836 | { | |
837 | .cmd = L2TP_CMD_TUNNEL_GET, | |
838 | .doit = l2tp_nl_cmd_tunnel_get, | |
839 | .dumpit = l2tp_nl_cmd_tunnel_dump, | |
840 | .policy = l2tp_nl_policy, | |
841 | .flags = GENL_ADMIN_PERM, | |
842 | }, | |
843 | { | |
844 | .cmd = L2TP_CMD_SESSION_CREATE, | |
845 | .doit = l2tp_nl_cmd_session_create, | |
846 | .policy = l2tp_nl_policy, | |
847 | .flags = GENL_ADMIN_PERM, | |
848 | }, | |
849 | { | |
850 | .cmd = L2TP_CMD_SESSION_DELETE, | |
851 | .doit = l2tp_nl_cmd_session_delete, | |
852 | .policy = l2tp_nl_policy, | |
853 | .flags = GENL_ADMIN_PERM, | |
854 | }, | |
855 | { | |
856 | .cmd = L2TP_CMD_SESSION_MODIFY, | |
857 | .doit = l2tp_nl_cmd_session_modify, | |
858 | .policy = l2tp_nl_policy, | |
859 | .flags = GENL_ADMIN_PERM, | |
860 | }, | |
861 | { | |
862 | .cmd = L2TP_CMD_SESSION_GET, | |
863 | .doit = l2tp_nl_cmd_session_get, | |
864 | .dumpit = l2tp_nl_cmd_session_dump, | |
865 | .policy = l2tp_nl_policy, | |
866 | .flags = GENL_ADMIN_PERM, | |
867 | }, | |
868 | }; | |
869 | ||
870 | int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops) | |
871 | { | |
872 | int ret; | |
873 | ||
874 | ret = -EINVAL; | |
875 | if (pw_type >= __L2TP_PWTYPE_MAX) | |
876 | goto err; | |
877 | ||
878 | genl_lock(); | |
879 | ret = -EBUSY; | |
880 | if (l2tp_nl_cmd_ops[pw_type]) | |
881 | goto out; | |
882 | ||
883 | l2tp_nl_cmd_ops[pw_type] = ops; | |
8cb49014 | 884 | ret = 0; |
309795f4 JC |
885 | |
886 | out: | |
887 | genl_unlock(); | |
888 | err: | |
8cb49014 | 889 | return ret; |
309795f4 JC |
890 | } |
891 | EXPORT_SYMBOL_GPL(l2tp_nl_register_ops); | |
892 | ||
893 | void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type) | |
894 | { | |
895 | if (pw_type < __L2TP_PWTYPE_MAX) { | |
896 | genl_lock(); | |
897 | l2tp_nl_cmd_ops[pw_type] = NULL; | |
898 | genl_unlock(); | |
899 | } | |
900 | } | |
901 | EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops); | |
902 | ||
903 | static int l2tp_nl_init(void) | |
904 | { | |
905 | int err; | |
906 | ||
a4ca44fa | 907 | pr_info("L2TP netlink interface\n"); |
309795f4 JC |
908 | err = genl_register_family_with_ops(&l2tp_nl_family, l2tp_nl_ops, |
909 | ARRAY_SIZE(l2tp_nl_ops)); | |
910 | ||
911 | return err; | |
912 | } | |
913 | ||
914 | static void l2tp_nl_cleanup(void) | |
915 | { | |
916 | genl_unregister_family(&l2tp_nl_family); | |
917 | } | |
918 | ||
919 | module_init(l2tp_nl_init); | |
920 | module_exit(l2tp_nl_cleanup); | |
921 | ||
922 | MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); | |
923 | MODULE_DESCRIPTION("L2TP netlink"); | |
924 | MODULE_LICENSE("GPL"); | |
925 | MODULE_VERSION("1.0"); | |
e9412c37 | 926 | MODULE_ALIAS_GENL_FAMILY("l2tp"); |