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_tunnel_get_session(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 #ifdef CONFIG_MODULES
612 if (l2tp_nl_cmd_ops[cfg.pw_type] == NULL) {
614 request_module("net-l2tp-type-%u", cfg.pw_type);
618 if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
619 (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
620 ret = -EPROTONOSUPPORT;
624 ret = l2tp_nl_cmd_ops[cfg.pw_type]->session_create(net, tunnel,
630 session = l2tp_tunnel_get_session(tunnel, session_id);
632 ret = l2tp_session_notify(&l2tp_nl_family, info, session,
633 L2TP_CMD_SESSION_CREATE);
634 l2tp_session_dec_refcount(session);
639 l2tp_tunnel_dec_refcount(tunnel);
644 static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
647 struct l2tp_session *session;
650 session = l2tp_nl_session_get(info);
651 if (session == NULL) {
656 l2tp_session_notify(&l2tp_nl_family, info,
657 session, L2TP_CMD_SESSION_DELETE);
659 pw_type = session->pwtype;
660 if (pw_type < __L2TP_PWTYPE_MAX)
661 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
662 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
664 l2tp_session_dec_refcount(session);
670 static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
673 struct l2tp_session *session;
675 session = l2tp_nl_session_get(info);
676 if (session == NULL) {
681 if (info->attrs[L2TP_ATTR_DEBUG])
682 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
684 if (info->attrs[L2TP_ATTR_RECV_SEQ])
685 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
687 if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
688 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
689 l2tp_session_set_header_len(session, session->tunnel->version);
692 if (info->attrs[L2TP_ATTR_LNS_MODE])
693 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
695 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
696 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
698 ret = l2tp_session_notify(&l2tp_nl_family, info,
699 session, L2TP_CMD_SESSION_MODIFY);
701 l2tp_session_dec_refcount(session);
707 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
708 struct l2tp_session *session, u8 cmd)
712 struct l2tp_tunnel *tunnel = session->tunnel;
714 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
718 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
719 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
720 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
721 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
722 session->peer_session_id) ||
723 nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
724 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype))
725 goto nla_put_failure;
727 if ((session->ifname[0] &&
728 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
729 (session->cookie_len &&
730 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
731 &session->cookie[0])) ||
732 (session->peer_cookie_len &&
733 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
734 &session->peer_cookie[0])) ||
735 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
736 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
737 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
738 (l2tp_tunnel_uses_xfrm(tunnel) &&
739 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
740 (session->reorder_timeout &&
741 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT,
742 session->reorder_timeout, L2TP_ATTR_PAD)))
743 goto nla_put_failure;
745 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
747 goto nla_put_failure;
749 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
750 atomic_long_read(&session->stats.tx_packets),
751 L2TP_ATTR_STATS_PAD) ||
752 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
753 atomic_long_read(&session->stats.tx_bytes),
754 L2TP_ATTR_STATS_PAD) ||
755 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
756 atomic_long_read(&session->stats.tx_errors),
757 L2TP_ATTR_STATS_PAD) ||
758 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
759 atomic_long_read(&session->stats.rx_packets),
760 L2TP_ATTR_STATS_PAD) ||
761 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
762 atomic_long_read(&session->stats.rx_bytes),
763 L2TP_ATTR_STATS_PAD) ||
764 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
765 atomic_long_read(&session->stats.rx_seq_discards),
766 L2TP_ATTR_STATS_PAD) ||
767 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
768 atomic_long_read(&session->stats.rx_oos_packets),
769 L2TP_ATTR_STATS_PAD) ||
770 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
771 atomic_long_read(&session->stats.rx_errors),
772 L2TP_ATTR_STATS_PAD))
773 goto nla_put_failure;
774 nla_nest_end(skb, nest);
776 genlmsg_end(skb, hdr);
780 genlmsg_cancel(skb, hdr);
784 static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
786 struct l2tp_session *session;
790 session = l2tp_nl_session_get(info);
791 if (session == NULL) {
796 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
802 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
803 0, session, L2TP_CMD_SESSION_GET);
807 ret = genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
809 l2tp_session_dec_refcount(session);
816 l2tp_session_dec_refcount(session);
821 static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
823 struct net *net = sock_net(skb->sk);
824 struct l2tp_session *session;
825 struct l2tp_tunnel *tunnel = NULL;
826 int ti = cb->args[0];
827 int si = cb->args[1];
830 if (tunnel == NULL) {
831 tunnel = l2tp_tunnel_get_nth(net, ti);
836 session = l2tp_session_get_nth(tunnel, si);
837 if (session == NULL) {
839 l2tp_tunnel_dec_refcount(tunnel);
845 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
846 cb->nlh->nlmsg_seq, NLM_F_MULTI,
847 session, L2TP_CMD_SESSION_GET) < 0) {
848 l2tp_session_dec_refcount(session);
849 l2tp_tunnel_dec_refcount(tunnel);
852 l2tp_session_dec_refcount(session);
864 static const struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
865 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
866 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
867 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
868 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
869 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
870 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
871 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
872 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
873 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
874 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
875 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
876 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
877 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
878 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
879 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
880 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
881 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
882 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
883 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
884 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
885 [L2TP_ATTR_FD] = { .type = NLA_U32, },
886 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
887 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
888 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
889 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
890 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
891 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
892 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
893 [L2TP_ATTR_IP6_SADDR] = {
895 .len = sizeof(struct in6_addr),
897 [L2TP_ATTR_IP6_DADDR] = {
899 .len = sizeof(struct in6_addr),
901 [L2TP_ATTR_IFNAME] = {
902 .type = NLA_NUL_STRING,
905 [L2TP_ATTR_COOKIE] = {
909 [L2TP_ATTR_PEER_COOKIE] = {
915 static const struct genl_ops l2tp_nl_ops[] = {
917 .cmd = L2TP_CMD_NOOP,
918 .doit = l2tp_nl_cmd_noop,
919 .policy = l2tp_nl_policy,
920 /* can be retrieved by unprivileged users */
923 .cmd = L2TP_CMD_TUNNEL_CREATE,
924 .doit = l2tp_nl_cmd_tunnel_create,
925 .policy = l2tp_nl_policy,
926 .flags = GENL_ADMIN_PERM,
929 .cmd = L2TP_CMD_TUNNEL_DELETE,
930 .doit = l2tp_nl_cmd_tunnel_delete,
931 .policy = l2tp_nl_policy,
932 .flags = GENL_ADMIN_PERM,
935 .cmd = L2TP_CMD_TUNNEL_MODIFY,
936 .doit = l2tp_nl_cmd_tunnel_modify,
937 .policy = l2tp_nl_policy,
938 .flags = GENL_ADMIN_PERM,
941 .cmd = L2TP_CMD_TUNNEL_GET,
942 .doit = l2tp_nl_cmd_tunnel_get,
943 .dumpit = l2tp_nl_cmd_tunnel_dump,
944 .policy = l2tp_nl_policy,
945 .flags = GENL_ADMIN_PERM,
948 .cmd = L2TP_CMD_SESSION_CREATE,
949 .doit = l2tp_nl_cmd_session_create,
950 .policy = l2tp_nl_policy,
951 .flags = GENL_ADMIN_PERM,
954 .cmd = L2TP_CMD_SESSION_DELETE,
955 .doit = l2tp_nl_cmd_session_delete,
956 .policy = l2tp_nl_policy,
957 .flags = GENL_ADMIN_PERM,
960 .cmd = L2TP_CMD_SESSION_MODIFY,
961 .doit = l2tp_nl_cmd_session_modify,
962 .policy = l2tp_nl_policy,
963 .flags = GENL_ADMIN_PERM,
966 .cmd = L2TP_CMD_SESSION_GET,
967 .doit = l2tp_nl_cmd_session_get,
968 .dumpit = l2tp_nl_cmd_session_dump,
969 .policy = l2tp_nl_policy,
970 .flags = GENL_ADMIN_PERM,
974 static struct genl_family l2tp_nl_family __ro_after_init = {
975 .name = L2TP_GENL_NAME,
976 .version = L2TP_GENL_VERSION,
978 .maxattr = L2TP_ATTR_MAX,
980 .module = THIS_MODULE,
982 .n_ops = ARRAY_SIZE(l2tp_nl_ops),
983 .mcgrps = l2tp_multicast_group,
984 .n_mcgrps = ARRAY_SIZE(l2tp_multicast_group),
987 int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
992 if (pw_type >= __L2TP_PWTYPE_MAX)
997 if (l2tp_nl_cmd_ops[pw_type])
1000 l2tp_nl_cmd_ops[pw_type] = ops;
1008 EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
1010 void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
1012 if (pw_type < __L2TP_PWTYPE_MAX) {
1014 l2tp_nl_cmd_ops[pw_type] = NULL;
1018 EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
1020 static int __init l2tp_nl_init(void)
1022 pr_info("L2TP netlink interface\n");
1023 return genl_register_family(&l2tp_nl_family);
1026 static void l2tp_nl_cleanup(void)
1028 genl_unregister_family(&l2tp_nl_family);
1031 module_init(l2tp_nl_init);
1032 module_exit(l2tp_nl_cleanup);
1034 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1035 MODULE_DESCRIPTION("L2TP netlink");
1036 MODULE_LICENSE("GPL");
1037 MODULE_VERSION("1.0");
1038 MODULE_ALIAS_GENL_FAMILY("l2tp");