2 * L2TP netlink layer, for management
4 * Copyright (c) 2008,2009,2010 Katalix Systems Ltd
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>
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.
17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20 #include <net/genetlink.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>
29 #include <linux/l2tp.h>
31 #include "l2tp_core.h"
34 static struct genl_family l2tp_nl_family;
36 static const struct genl_multicast_group l2tp_multicast_group[] = {
38 .name = L2TP_GENL_MCGROUP,
42 static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq,
43 int flags, struct l2tp_tunnel *tunnel, u8 cmd);
44 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq,
45 int flags, struct l2tp_session *session,
48 /* Accessed under genl lock */
49 static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
51 static struct l2tp_session *l2tp_nl_session_get(struct genl_info *info)
56 struct l2tp_tunnel *tunnel;
57 struct l2tp_session *session = NULL;
58 struct net *net = genl_info_net(info);
60 if (info->attrs[L2TP_ATTR_IFNAME]) {
61 ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
62 session = l2tp_session_get_by_ifname(net, ifname);
63 } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) &&
64 (info->attrs[L2TP_ATTR_CONN_ID])) {
65 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
66 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
67 tunnel = l2tp_tunnel_get(net, tunnel_id);
69 session = l2tp_session_get(net, tunnel, session_id);
70 l2tp_tunnel_dec_refcount(tunnel);
77 static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
83 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
89 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
90 &l2tp_nl_family, 0, L2TP_CMD_NOOP);
96 genlmsg_end(msg, hdr);
98 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
107 static int l2tp_tunnel_notify(struct genl_family *family,
108 struct genl_info *info,
109 struct l2tp_tunnel *tunnel,
115 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
119 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
120 NLM_F_ACK, tunnel, cmd);
123 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
124 /* We don't care if no one is listening */
135 static int l2tp_session_notify(struct genl_family *family,
136 struct genl_info *info,
137 struct l2tp_session *session,
143 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
147 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
148 NLM_F_ACK, session, cmd);
151 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
152 /* We don't care if no one is listening */
163 static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
170 struct l2tp_tunnel_cfg cfg = { 0, };
171 struct l2tp_tunnel *tunnel;
172 struct net *net = genl_info_net(info);
174 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
178 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
180 if (!info->attrs[L2TP_ATTR_PEER_CONN_ID]) {
184 peer_tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_CONN_ID]);
186 if (!info->attrs[L2TP_ATTR_PROTO_VERSION]) {
190 proto_version = nla_get_u8(info->attrs[L2TP_ATTR_PROTO_VERSION]);
192 if (!info->attrs[L2TP_ATTR_ENCAP_TYPE]) {
196 cfg.encap = nla_get_u16(info->attrs[L2TP_ATTR_ENCAP_TYPE]);
199 if (info->attrs[L2TP_ATTR_FD]) {
200 fd = nla_get_u32(info->attrs[L2TP_ATTR_FD]);
202 #if IS_ENABLED(CONFIG_IPV6)
203 if (info->attrs[L2TP_ATTR_IP6_SADDR] &&
204 info->attrs[L2TP_ATTR_IP6_DADDR]) {
205 cfg.local_ip6 = nla_data(
206 info->attrs[L2TP_ATTR_IP6_SADDR]);
207 cfg.peer_ip6 = nla_data(
208 info->attrs[L2TP_ATTR_IP6_DADDR]);
211 if (info->attrs[L2TP_ATTR_IP_SADDR] &&
212 info->attrs[L2TP_ATTR_IP_DADDR]) {
213 cfg.local_ip.s_addr = nla_get_in_addr(
214 info->attrs[L2TP_ATTR_IP_SADDR]);
215 cfg.peer_ip.s_addr = nla_get_in_addr(
216 info->attrs[L2TP_ATTR_IP_DADDR]);
221 if (info->attrs[L2TP_ATTR_UDP_SPORT])
222 cfg.local_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_SPORT]);
223 if (info->attrs[L2TP_ATTR_UDP_DPORT])
224 cfg.peer_udp_port = nla_get_u16(info->attrs[L2TP_ATTR_UDP_DPORT]);
225 cfg.use_udp_checksums = nla_get_flag(
226 info->attrs[L2TP_ATTR_UDP_CSUM]);
228 #if IS_ENABLED(CONFIG_IPV6)
229 cfg.udp6_zero_tx_checksums = nla_get_flag(
230 info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]);
231 cfg.udp6_zero_rx_checksums = nla_get_flag(
232 info->attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]);
236 if (info->attrs[L2TP_ATTR_DEBUG])
237 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
241 case L2TP_ENCAPTYPE_UDP:
242 case L2TP_ENCAPTYPE_IP:
243 ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
244 peer_tunnel_id, &cfg, &tunnel);
251 l2tp_tunnel_inc_refcount(tunnel);
252 ret = l2tp_tunnel_register(tunnel, net, &cfg);
257 ret = l2tp_tunnel_notify(&l2tp_nl_family, info, tunnel,
258 L2TP_CMD_TUNNEL_CREATE);
259 l2tp_tunnel_dec_refcount(tunnel);
265 static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
267 struct l2tp_tunnel *tunnel;
270 struct net *net = genl_info_net(info);
272 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
276 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
278 tunnel = l2tp_tunnel_get(net, tunnel_id);
284 l2tp_tunnel_notify(&l2tp_nl_family, info,
285 tunnel, L2TP_CMD_TUNNEL_DELETE);
287 l2tp_tunnel_delete(tunnel);
289 l2tp_tunnel_dec_refcount(tunnel);
295 static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
297 struct l2tp_tunnel *tunnel;
300 struct net *net = genl_info_net(info);
302 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
306 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
308 tunnel = l2tp_tunnel_get(net, tunnel_id);
314 if (info->attrs[L2TP_ATTR_DEBUG])
315 tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
317 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
318 tunnel, L2TP_CMD_TUNNEL_MODIFY);
320 l2tp_tunnel_dec_refcount(tunnel);
326 static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
327 struct l2tp_tunnel *tunnel, u8 cmd)
331 struct sock *sk = NULL;
332 struct inet_sock *inet;
333 #if IS_ENABLED(CONFIG_IPV6)
334 struct ipv6_pinfo *np = NULL;
337 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
341 if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
342 nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
343 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
344 nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) ||
345 nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
346 goto nla_put_failure;
348 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
350 goto nla_put_failure;
352 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
353 atomic_long_read(&tunnel->stats.tx_packets),
354 L2TP_ATTR_STATS_PAD) ||
355 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
356 atomic_long_read(&tunnel->stats.tx_bytes),
357 L2TP_ATTR_STATS_PAD) ||
358 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
359 atomic_long_read(&tunnel->stats.tx_errors),
360 L2TP_ATTR_STATS_PAD) ||
361 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
362 atomic_long_read(&tunnel->stats.rx_packets),
363 L2TP_ATTR_STATS_PAD) ||
364 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
365 atomic_long_read(&tunnel->stats.rx_bytes),
366 L2TP_ATTR_STATS_PAD) ||
367 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
368 atomic_long_read(&tunnel->stats.rx_seq_discards),
369 L2TP_ATTR_STATS_PAD) ||
370 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
371 atomic_long_read(&tunnel->stats.rx_oos_packets),
372 L2TP_ATTR_STATS_PAD) ||
373 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
374 atomic_long_read(&tunnel->stats.rx_errors),
375 L2TP_ATTR_STATS_PAD))
376 goto nla_put_failure;
377 nla_nest_end(skb, nest);
383 #if IS_ENABLED(CONFIG_IPV6)
384 if (sk->sk_family == AF_INET6)
390 switch (tunnel->encap) {
391 case L2TP_ENCAPTYPE_UDP:
392 switch (sk->sk_family) {
394 if (nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx))
395 goto nla_put_failure;
397 #if IS_ENABLED(CONFIG_IPV6)
399 if (udp_get_no_check6_tx(sk) &&
400 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_TX))
401 goto nla_put_failure;
402 if (udp_get_no_check6_rx(sk) &&
403 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_RX))
404 goto nla_put_failure;
408 if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
409 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)))
410 goto nla_put_failure;
412 case L2TP_ENCAPTYPE_IP:
413 #if IS_ENABLED(CONFIG_IPV6)
415 if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR,
417 nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR,
419 goto nla_put_failure;
422 if (nla_put_in_addr(skb, L2TP_ATTR_IP_SADDR,
424 nla_put_in_addr(skb, L2TP_ATTR_IP_DADDR,
426 goto nla_put_failure;
431 genlmsg_end(skb, hdr);
435 genlmsg_cancel(skb, hdr);
439 static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
441 struct l2tp_tunnel *tunnel;
445 struct net *net = genl_info_net(info);
447 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
452 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
454 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
460 tunnel = l2tp_tunnel_get(net, tunnel_id);
466 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
467 NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET);
469 goto err_nlmsg_tunnel;
471 l2tp_tunnel_dec_refcount(tunnel);
473 return genlmsg_unicast(net, msg, info->snd_portid);
476 l2tp_tunnel_dec_refcount(tunnel);
483 static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
485 int ti = cb->args[0];
486 struct l2tp_tunnel *tunnel;
487 struct net *net = sock_net(skb->sk);
490 tunnel = l2tp_tunnel_get_nth(net, ti);
494 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
495 cb->nlh->nlmsg_seq, NLM_F_MULTI,
496 tunnel, L2TP_CMD_TUNNEL_GET) < 0) {
497 l2tp_tunnel_dec_refcount(tunnel);
500 l2tp_tunnel_dec_refcount(tunnel);
511 static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
517 struct l2tp_tunnel *tunnel;
518 struct l2tp_session *session;
519 struct l2tp_session_cfg cfg = { 0, };
520 struct net *net = genl_info_net(info);
522 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
527 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
528 tunnel = l2tp_tunnel_get(net, tunnel_id);
534 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
538 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
540 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
544 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
546 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
550 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
551 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
556 /* L2TPv2 only accepts PPP pseudo-wires */
557 if (tunnel->version == 2 && cfg.pw_type != L2TP_PWTYPE_PPP) {
558 ret = -EPROTONOSUPPORT;
562 if (tunnel->version > 2) {
563 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE]) {
564 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
565 if (cfg.l2specific_type != L2TP_L2SPECTYPE_DEFAULT &&
566 cfg.l2specific_type != L2TP_L2SPECTYPE_NONE) {
571 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
574 if (info->attrs[L2TP_ATTR_COOKIE]) {
575 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
580 cfg.cookie_len = len;
581 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
583 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
584 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
589 cfg.peer_cookie_len = len;
590 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
592 if (info->attrs[L2TP_ATTR_IFNAME])
593 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
596 if (info->attrs[L2TP_ATTR_DEBUG])
597 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
599 if (info->attrs[L2TP_ATTR_RECV_SEQ])
600 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
602 if (info->attrs[L2TP_ATTR_SEND_SEQ])
603 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
605 if (info->attrs[L2TP_ATTR_LNS_MODE])
606 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
608 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
609 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
611 if (info->attrs[L2TP_ATTR_MTU])
612 cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
614 if (info->attrs[L2TP_ATTR_MRU])
615 cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
617 #ifdef CONFIG_MODULES
618 if (l2tp_nl_cmd_ops[cfg.pw_type] == NULL) {
620 request_module("net-l2tp-type-%u", cfg.pw_type);
624 if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
625 (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
626 ret = -EPROTONOSUPPORT;
630 ret = l2tp_nl_cmd_ops[cfg.pw_type]->session_create(net, tunnel,
636 session = l2tp_session_get(net, tunnel, session_id);
638 ret = l2tp_session_notify(&l2tp_nl_family, info, session,
639 L2TP_CMD_SESSION_CREATE);
640 l2tp_session_dec_refcount(session);
645 l2tp_tunnel_dec_refcount(tunnel);
650 static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
653 struct l2tp_session *session;
656 session = l2tp_nl_session_get(info);
657 if (session == NULL) {
662 l2tp_session_notify(&l2tp_nl_family, info,
663 session, L2TP_CMD_SESSION_DELETE);
665 pw_type = session->pwtype;
666 if (pw_type < __L2TP_PWTYPE_MAX)
667 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
668 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
670 l2tp_session_dec_refcount(session);
676 static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
679 struct l2tp_session *session;
681 session = l2tp_nl_session_get(info);
682 if (session == NULL) {
687 if (info->attrs[L2TP_ATTR_DEBUG])
688 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
690 if (info->attrs[L2TP_ATTR_RECV_SEQ])
691 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
693 if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
694 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
695 l2tp_session_set_header_len(session, session->tunnel->version);
698 if (info->attrs[L2TP_ATTR_LNS_MODE])
699 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
701 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
702 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
704 if (info->attrs[L2TP_ATTR_MTU])
705 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
707 if (info->attrs[L2TP_ATTR_MRU])
708 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
710 ret = l2tp_session_notify(&l2tp_nl_family, info,
711 session, L2TP_CMD_SESSION_MODIFY);
713 l2tp_session_dec_refcount(session);
719 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
720 struct l2tp_session *session, u8 cmd)
724 struct l2tp_tunnel *tunnel = session->tunnel;
725 struct sock *sk = NULL;
729 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
733 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
734 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
735 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
736 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
737 session->peer_session_id) ||
738 nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
739 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) ||
740 nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) ||
742 nla_put_u16(skb, L2TP_ATTR_MRU, session->mru)))
743 goto nla_put_failure;
745 if ((session->ifname[0] &&
746 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
747 (session->cookie_len &&
748 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
749 &session->cookie[0])) ||
750 (session->peer_cookie_len &&
751 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
752 &session->peer_cookie[0])) ||
753 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
754 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
755 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
757 (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) &&
758 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
760 (session->reorder_timeout &&
761 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT,
762 session->reorder_timeout, L2TP_ATTR_PAD)))
763 goto nla_put_failure;
765 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
767 goto nla_put_failure;
769 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
770 atomic_long_read(&session->stats.tx_packets),
771 L2TP_ATTR_STATS_PAD) ||
772 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
773 atomic_long_read(&session->stats.tx_bytes),
774 L2TP_ATTR_STATS_PAD) ||
775 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
776 atomic_long_read(&session->stats.tx_errors),
777 L2TP_ATTR_STATS_PAD) ||
778 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
779 atomic_long_read(&session->stats.rx_packets),
780 L2TP_ATTR_STATS_PAD) ||
781 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
782 atomic_long_read(&session->stats.rx_bytes),
783 L2TP_ATTR_STATS_PAD) ||
784 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
785 atomic_long_read(&session->stats.rx_seq_discards),
786 L2TP_ATTR_STATS_PAD) ||
787 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
788 atomic_long_read(&session->stats.rx_oos_packets),
789 L2TP_ATTR_STATS_PAD) ||
790 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
791 atomic_long_read(&session->stats.rx_errors),
792 L2TP_ATTR_STATS_PAD))
793 goto nla_put_failure;
794 nla_nest_end(skb, nest);
796 genlmsg_end(skb, hdr);
800 genlmsg_cancel(skb, hdr);
804 static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
806 struct l2tp_session *session;
810 session = l2tp_nl_session_get(info);
811 if (session == NULL) {
816 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
822 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
823 0, session, L2TP_CMD_SESSION_GET);
827 ret = genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
829 l2tp_session_dec_refcount(session);
836 l2tp_session_dec_refcount(session);
841 static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
843 struct net *net = sock_net(skb->sk);
844 struct l2tp_session *session;
845 struct l2tp_tunnel *tunnel = NULL;
846 int ti = cb->args[0];
847 int si = cb->args[1];
850 if (tunnel == NULL) {
851 tunnel = l2tp_tunnel_get_nth(net, ti);
856 session = l2tp_session_get_nth(tunnel, si);
857 if (session == NULL) {
859 l2tp_tunnel_dec_refcount(tunnel);
865 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
866 cb->nlh->nlmsg_seq, NLM_F_MULTI,
867 session, L2TP_CMD_SESSION_GET) < 0) {
868 l2tp_session_dec_refcount(session);
869 l2tp_tunnel_dec_refcount(tunnel);
872 l2tp_session_dec_refcount(session);
884 static const struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
885 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
886 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
887 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
888 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
889 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
890 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
891 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
892 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
893 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
894 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
895 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
896 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
897 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
898 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
899 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
900 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
901 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
902 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
903 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
904 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
905 [L2TP_ATTR_FD] = { .type = NLA_U32, },
906 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
907 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
908 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
909 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
910 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
911 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
912 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
913 [L2TP_ATTR_IP6_SADDR] = {
915 .len = sizeof(struct in6_addr),
917 [L2TP_ATTR_IP6_DADDR] = {
919 .len = sizeof(struct in6_addr),
921 [L2TP_ATTR_IFNAME] = {
922 .type = NLA_NUL_STRING,
925 [L2TP_ATTR_COOKIE] = {
929 [L2TP_ATTR_PEER_COOKIE] = {
935 static const struct genl_ops l2tp_nl_ops[] = {
937 .cmd = L2TP_CMD_NOOP,
938 .doit = l2tp_nl_cmd_noop,
939 .policy = l2tp_nl_policy,
940 /* can be retrieved by unprivileged users */
943 .cmd = L2TP_CMD_TUNNEL_CREATE,
944 .doit = l2tp_nl_cmd_tunnel_create,
945 .policy = l2tp_nl_policy,
946 .flags = GENL_ADMIN_PERM,
949 .cmd = L2TP_CMD_TUNNEL_DELETE,
950 .doit = l2tp_nl_cmd_tunnel_delete,
951 .policy = l2tp_nl_policy,
952 .flags = GENL_ADMIN_PERM,
955 .cmd = L2TP_CMD_TUNNEL_MODIFY,
956 .doit = l2tp_nl_cmd_tunnel_modify,
957 .policy = l2tp_nl_policy,
958 .flags = GENL_ADMIN_PERM,
961 .cmd = L2TP_CMD_TUNNEL_GET,
962 .doit = l2tp_nl_cmd_tunnel_get,
963 .dumpit = l2tp_nl_cmd_tunnel_dump,
964 .policy = l2tp_nl_policy,
965 .flags = GENL_ADMIN_PERM,
968 .cmd = L2TP_CMD_SESSION_CREATE,
969 .doit = l2tp_nl_cmd_session_create,
970 .policy = l2tp_nl_policy,
971 .flags = GENL_ADMIN_PERM,
974 .cmd = L2TP_CMD_SESSION_DELETE,
975 .doit = l2tp_nl_cmd_session_delete,
976 .policy = l2tp_nl_policy,
977 .flags = GENL_ADMIN_PERM,
980 .cmd = L2TP_CMD_SESSION_MODIFY,
981 .doit = l2tp_nl_cmd_session_modify,
982 .policy = l2tp_nl_policy,
983 .flags = GENL_ADMIN_PERM,
986 .cmd = L2TP_CMD_SESSION_GET,
987 .doit = l2tp_nl_cmd_session_get,
988 .dumpit = l2tp_nl_cmd_session_dump,
989 .policy = l2tp_nl_policy,
990 .flags = GENL_ADMIN_PERM,
994 static struct genl_family l2tp_nl_family __ro_after_init = {
995 .name = L2TP_GENL_NAME,
996 .version = L2TP_GENL_VERSION,
998 .maxattr = L2TP_ATTR_MAX,
1000 .module = THIS_MODULE,
1002 .n_ops = ARRAY_SIZE(l2tp_nl_ops),
1003 .mcgrps = l2tp_multicast_group,
1004 .n_mcgrps = ARRAY_SIZE(l2tp_multicast_group),
1007 int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
1012 if (pw_type >= __L2TP_PWTYPE_MAX)
1017 if (l2tp_nl_cmd_ops[pw_type])
1020 l2tp_nl_cmd_ops[pw_type] = ops;
1028 EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
1030 void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
1032 if (pw_type < __L2TP_PWTYPE_MAX) {
1034 l2tp_nl_cmd_ops[pw_type] = NULL;
1038 EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
1040 static int __init l2tp_nl_init(void)
1042 pr_info("L2TP netlink interface\n");
1043 return genl_register_family(&l2tp_nl_family);
1046 static void l2tp_nl_cleanup(void)
1048 genl_unregister_family(&l2tp_nl_family);
1051 module_init(l2tp_nl_init);
1052 module_exit(l2tp_nl_cleanup);
1054 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1055 MODULE_DESCRIPTION("L2TP netlink");
1056 MODULE_LICENSE("GPL");
1057 MODULE_VERSION("1.0");
1058 MODULE_ALIAS_GENL_FAMILY("l2tp");