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,
57 struct l2tp_tunnel *tunnel;
58 struct l2tp_session *session = NULL;
59 struct net *net = genl_info_net(info);
61 if (info->attrs[L2TP_ATTR_IFNAME]) {
62 ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
63 session = l2tp_session_get_by_ifname(net, ifname, do_ref);
64 } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) &&
65 (info->attrs[L2TP_ATTR_CONN_ID])) {
66 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
67 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
68 tunnel = l2tp_tunnel_find(net, tunnel_id);
70 session = l2tp_session_get(net, tunnel, session_id,
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]);
239 tunnel = l2tp_tunnel_find(net, tunnel_id);
240 if (tunnel != NULL) {
247 case L2TP_ENCAPTYPE_UDP:
248 case L2TP_ENCAPTYPE_IP:
249 ret = l2tp_tunnel_create(net, fd, proto_version, tunnel_id,
250 peer_tunnel_id, &cfg, &tunnel);
255 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
256 tunnel, L2TP_CMD_TUNNEL_CREATE);
261 static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
263 struct l2tp_tunnel *tunnel;
266 struct net *net = genl_info_net(info);
268 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
272 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
274 tunnel = l2tp_tunnel_find(net, tunnel_id);
275 if (tunnel == NULL) {
280 l2tp_tunnel_notify(&l2tp_nl_family, info,
281 tunnel, L2TP_CMD_TUNNEL_DELETE);
283 (void) l2tp_tunnel_delete(tunnel);
289 static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
291 struct l2tp_tunnel *tunnel;
294 struct net *net = genl_info_net(info);
296 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
300 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
302 tunnel = l2tp_tunnel_find(net, tunnel_id);
303 if (tunnel == NULL) {
308 if (info->attrs[L2TP_ATTR_DEBUG])
309 tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
311 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
312 tunnel, L2TP_CMD_TUNNEL_MODIFY);
318 static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
319 struct l2tp_tunnel *tunnel, u8 cmd)
323 struct sock *sk = NULL;
324 struct inet_sock *inet;
325 #if IS_ENABLED(CONFIG_IPV6)
326 struct ipv6_pinfo *np = NULL;
329 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
333 if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
334 nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
335 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
336 nla_put_u32(skb, L2TP_ATTR_DEBUG, tunnel->debug) ||
337 nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
338 goto nla_put_failure;
340 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
342 goto nla_put_failure;
344 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
345 atomic_long_read(&tunnel->stats.tx_packets),
346 L2TP_ATTR_STATS_PAD) ||
347 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
348 atomic_long_read(&tunnel->stats.tx_bytes),
349 L2TP_ATTR_STATS_PAD) ||
350 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
351 atomic_long_read(&tunnel->stats.tx_errors),
352 L2TP_ATTR_STATS_PAD) ||
353 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
354 atomic_long_read(&tunnel->stats.rx_packets),
355 L2TP_ATTR_STATS_PAD) ||
356 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
357 atomic_long_read(&tunnel->stats.rx_bytes),
358 L2TP_ATTR_STATS_PAD) ||
359 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
360 atomic_long_read(&tunnel->stats.rx_seq_discards),
361 L2TP_ATTR_STATS_PAD) ||
362 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
363 atomic_long_read(&tunnel->stats.rx_oos_packets),
364 L2TP_ATTR_STATS_PAD) ||
365 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
366 atomic_long_read(&tunnel->stats.rx_errors),
367 L2TP_ATTR_STATS_PAD))
368 goto nla_put_failure;
369 nla_nest_end(skb, nest);
375 #if IS_ENABLED(CONFIG_IPV6)
376 if (sk->sk_family == AF_INET6)
382 switch (tunnel->encap) {
383 case L2TP_ENCAPTYPE_UDP:
384 switch (sk->sk_family) {
386 if (nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx))
387 goto nla_put_failure;
389 #if IS_ENABLED(CONFIG_IPV6)
391 if (udp_get_no_check6_tx(sk) &&
392 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_TX))
393 goto nla_put_failure;
394 if (udp_get_no_check6_rx(sk) &&
395 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_RX))
396 goto nla_put_failure;
400 if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
401 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)))
402 goto nla_put_failure;
404 case L2TP_ENCAPTYPE_IP:
405 #if IS_ENABLED(CONFIG_IPV6)
407 if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR,
409 nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR,
411 goto nla_put_failure;
414 if (nla_put_in_addr(skb, L2TP_ATTR_IP_SADDR,
416 nla_put_in_addr(skb, L2TP_ATTR_IP_DADDR,
418 goto nla_put_failure;
423 genlmsg_end(skb, hdr);
427 genlmsg_cancel(skb, hdr);
431 static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
433 struct l2tp_tunnel *tunnel;
437 struct net *net = genl_info_net(info);
439 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
444 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
446 tunnel = l2tp_tunnel_find(net, tunnel_id);
447 if (tunnel == NULL) {
452 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
458 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
459 NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET);
463 return genlmsg_unicast(net, msg, info->snd_portid);
472 static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
474 int ti = cb->args[0];
475 struct l2tp_tunnel *tunnel;
476 struct net *net = sock_net(skb->sk);
479 tunnel = l2tp_tunnel_find_nth(net, ti);
483 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
484 cb->nlh->nlmsg_seq, NLM_F_MULTI,
485 tunnel, L2TP_CMD_TUNNEL_GET) < 0)
497 static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
503 struct l2tp_tunnel *tunnel;
504 struct l2tp_session *session;
505 struct l2tp_session_cfg cfg = { 0, };
506 struct net *net = genl_info_net(info);
508 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
512 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
513 tunnel = l2tp_tunnel_find(net, tunnel_id);
519 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
523 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
525 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
529 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
531 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
535 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
536 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
541 if (tunnel->version > 2) {
542 if (info->attrs[L2TP_ATTR_OFFSET])
543 cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
545 if (info->attrs[L2TP_ATTR_DATA_SEQ])
546 cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
548 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
549 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
550 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
552 cfg.l2specific_len = 4;
553 if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
554 cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
556 if (info->attrs[L2TP_ATTR_COOKIE]) {
557 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
562 cfg.cookie_len = len;
563 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
565 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
566 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
571 cfg.peer_cookie_len = len;
572 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
574 if (info->attrs[L2TP_ATTR_IFNAME])
575 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
577 if (info->attrs[L2TP_ATTR_VLAN_ID])
578 cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
581 if (info->attrs[L2TP_ATTR_DEBUG])
582 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
584 if (info->attrs[L2TP_ATTR_RECV_SEQ])
585 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
587 if (info->attrs[L2TP_ATTR_SEND_SEQ])
588 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
590 if (info->attrs[L2TP_ATTR_LNS_MODE])
591 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
593 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
594 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
596 if (info->attrs[L2TP_ATTR_MTU])
597 cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
599 if (info->attrs[L2TP_ATTR_MRU])
600 cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
602 #ifdef CONFIG_MODULES
603 if (l2tp_nl_cmd_ops[cfg.pw_type] == NULL) {
605 request_module("net-l2tp-type-%u", cfg.pw_type);
609 if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
610 (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
611 ret = -EPROTONOSUPPORT;
615 /* Check that pseudowire-specific params are present */
616 switch (cfg.pw_type) {
617 case L2TP_PWTYPE_NONE:
619 case L2TP_PWTYPE_ETH_VLAN:
620 if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
625 case L2TP_PWTYPE_ETH:
627 case L2TP_PWTYPE_PPP:
628 case L2TP_PWTYPE_PPP_AC:
632 ret = -EPROTONOSUPPORT;
636 ret = -EPROTONOSUPPORT;
637 if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create)
638 ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id,
639 session_id, peer_session_id, &cfg);
642 session = l2tp_session_get(net, tunnel, session_id, false);
644 ret = l2tp_session_notify(&l2tp_nl_family, info, session,
645 L2TP_CMD_SESSION_CREATE);
646 l2tp_session_dec_refcount(session);
654 static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
657 struct l2tp_session *session;
660 session = l2tp_nl_session_get(info, true);
661 if (session == NULL) {
666 l2tp_session_notify(&l2tp_nl_family, info,
667 session, L2TP_CMD_SESSION_DELETE);
669 pw_type = session->pwtype;
670 if (pw_type < __L2TP_PWTYPE_MAX)
671 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
672 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
675 session->deref(session);
676 l2tp_session_dec_refcount(session);
682 static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
685 struct l2tp_session *session;
687 session = l2tp_nl_session_get(info, false);
688 if (session == NULL) {
693 if (info->attrs[L2TP_ATTR_DEBUG])
694 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
696 if (info->attrs[L2TP_ATTR_DATA_SEQ])
697 session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
699 if (info->attrs[L2TP_ATTR_RECV_SEQ])
700 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
702 if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
703 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
704 l2tp_session_set_header_len(session, session->tunnel->version);
707 if (info->attrs[L2TP_ATTR_LNS_MODE])
708 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
710 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
711 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
713 if (info->attrs[L2TP_ATTR_MTU])
714 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
716 if (info->attrs[L2TP_ATTR_MRU])
717 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
719 ret = l2tp_session_notify(&l2tp_nl_family, info,
720 session, L2TP_CMD_SESSION_MODIFY);
722 l2tp_session_dec_refcount(session);
728 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
729 struct l2tp_session *session, u8 cmd)
733 struct l2tp_tunnel *tunnel = session->tunnel;
734 struct sock *sk = NULL;
738 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
742 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
743 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
744 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
745 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
746 session->peer_session_id) ||
747 nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
748 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) ||
749 nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) ||
751 nla_put_u16(skb, L2TP_ATTR_MRU, session->mru)))
752 goto nla_put_failure;
754 if ((session->ifname[0] &&
755 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
756 (session->cookie_len &&
757 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
758 &session->cookie[0])) ||
759 (session->peer_cookie_len &&
760 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
761 &session->peer_cookie[0])) ||
762 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
763 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
764 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
766 (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) &&
767 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
769 (session->reorder_timeout &&
770 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT,
771 session->reorder_timeout, L2TP_ATTR_PAD)))
772 goto nla_put_failure;
774 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
776 goto nla_put_failure;
778 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
779 atomic_long_read(&session->stats.tx_packets),
780 L2TP_ATTR_STATS_PAD) ||
781 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
782 atomic_long_read(&session->stats.tx_bytes),
783 L2TP_ATTR_STATS_PAD) ||
784 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
785 atomic_long_read(&session->stats.tx_errors),
786 L2TP_ATTR_STATS_PAD) ||
787 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
788 atomic_long_read(&session->stats.rx_packets),
789 L2TP_ATTR_STATS_PAD) ||
790 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
791 atomic_long_read(&session->stats.rx_bytes),
792 L2TP_ATTR_STATS_PAD) ||
793 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
794 atomic_long_read(&session->stats.rx_seq_discards),
795 L2TP_ATTR_STATS_PAD) ||
796 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
797 atomic_long_read(&session->stats.rx_oos_packets),
798 L2TP_ATTR_STATS_PAD) ||
799 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
800 atomic_long_read(&session->stats.rx_errors),
801 L2TP_ATTR_STATS_PAD))
802 goto nla_put_failure;
803 nla_nest_end(skb, nest);
805 genlmsg_end(skb, hdr);
809 genlmsg_cancel(skb, hdr);
813 static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
815 struct l2tp_session *session;
819 session = l2tp_nl_session_get(info, false);
820 if (session == NULL) {
825 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
831 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
832 0, session, L2TP_CMD_SESSION_GET);
836 ret = genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
838 l2tp_session_dec_refcount(session);
845 l2tp_session_dec_refcount(session);
850 static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
852 struct net *net = sock_net(skb->sk);
853 struct l2tp_session *session;
854 struct l2tp_tunnel *tunnel = NULL;
855 int ti = cb->args[0];
856 int si = cb->args[1];
859 if (tunnel == NULL) {
860 tunnel = l2tp_tunnel_find_nth(net, ti);
865 session = l2tp_session_get_nth(tunnel, si, false);
866 if (session == NULL) {
873 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
874 cb->nlh->nlmsg_seq, NLM_F_MULTI,
875 session, L2TP_CMD_SESSION_GET) < 0) {
876 l2tp_session_dec_refcount(session);
879 l2tp_session_dec_refcount(session);
891 static const struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
892 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
893 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
894 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
895 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
896 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
897 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
898 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
899 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
900 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
901 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
902 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
903 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
904 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
905 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
906 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
907 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
908 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
909 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
910 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
911 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
912 [L2TP_ATTR_FD] = { .type = NLA_U32, },
913 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
914 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
915 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
916 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
917 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
918 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
919 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
920 [L2TP_ATTR_IP6_SADDR] = {
922 .len = sizeof(struct in6_addr),
924 [L2TP_ATTR_IP6_DADDR] = {
926 .len = sizeof(struct in6_addr),
928 [L2TP_ATTR_IFNAME] = {
929 .type = NLA_NUL_STRING,
932 [L2TP_ATTR_COOKIE] = {
936 [L2TP_ATTR_PEER_COOKIE] = {
942 static const struct genl_ops l2tp_nl_ops[] = {
944 .cmd = L2TP_CMD_NOOP,
945 .doit = l2tp_nl_cmd_noop,
946 .policy = l2tp_nl_policy,
947 /* can be retrieved by unprivileged users */
950 .cmd = L2TP_CMD_TUNNEL_CREATE,
951 .doit = l2tp_nl_cmd_tunnel_create,
952 .policy = l2tp_nl_policy,
953 .flags = GENL_ADMIN_PERM,
956 .cmd = L2TP_CMD_TUNNEL_DELETE,
957 .doit = l2tp_nl_cmd_tunnel_delete,
958 .policy = l2tp_nl_policy,
959 .flags = GENL_ADMIN_PERM,
962 .cmd = L2TP_CMD_TUNNEL_MODIFY,
963 .doit = l2tp_nl_cmd_tunnel_modify,
964 .policy = l2tp_nl_policy,
965 .flags = GENL_ADMIN_PERM,
968 .cmd = L2TP_CMD_TUNNEL_GET,
969 .doit = l2tp_nl_cmd_tunnel_get,
970 .dumpit = l2tp_nl_cmd_tunnel_dump,
971 .policy = l2tp_nl_policy,
972 .flags = GENL_ADMIN_PERM,
975 .cmd = L2TP_CMD_SESSION_CREATE,
976 .doit = l2tp_nl_cmd_session_create,
977 .policy = l2tp_nl_policy,
978 .flags = GENL_ADMIN_PERM,
981 .cmd = L2TP_CMD_SESSION_DELETE,
982 .doit = l2tp_nl_cmd_session_delete,
983 .policy = l2tp_nl_policy,
984 .flags = GENL_ADMIN_PERM,
987 .cmd = L2TP_CMD_SESSION_MODIFY,
988 .doit = l2tp_nl_cmd_session_modify,
989 .policy = l2tp_nl_policy,
990 .flags = GENL_ADMIN_PERM,
993 .cmd = L2TP_CMD_SESSION_GET,
994 .doit = l2tp_nl_cmd_session_get,
995 .dumpit = l2tp_nl_cmd_session_dump,
996 .policy = l2tp_nl_policy,
997 .flags = GENL_ADMIN_PERM,
1001 static struct genl_family l2tp_nl_family __ro_after_init = {
1002 .name = L2TP_GENL_NAME,
1003 .version = L2TP_GENL_VERSION,
1005 .maxattr = L2TP_ATTR_MAX,
1007 .module = THIS_MODULE,
1009 .n_ops = ARRAY_SIZE(l2tp_nl_ops),
1010 .mcgrps = l2tp_multicast_group,
1011 .n_mcgrps = ARRAY_SIZE(l2tp_multicast_group),
1014 int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
1019 if (pw_type >= __L2TP_PWTYPE_MAX)
1024 if (l2tp_nl_cmd_ops[pw_type])
1027 l2tp_nl_cmd_ops[pw_type] = ops;
1035 EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
1037 void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
1039 if (pw_type < __L2TP_PWTYPE_MAX) {
1041 l2tp_nl_cmd_ops[pw_type] = NULL;
1045 EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
1047 static int __init l2tp_nl_init(void)
1049 pr_info("L2TP netlink interface\n");
1050 return genl_register_family(&l2tp_nl_family);
1053 static void l2tp_nl_cleanup(void)
1055 genl_unregister_family(&l2tp_nl_family);
1058 module_init(l2tp_nl_init);
1059 module_exit(l2tp_nl_cleanup);
1061 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1062 MODULE_DESCRIPTION("L2TP netlink");
1063 MODULE_LICENSE("GPL");
1064 MODULE_VERSION("1.0");
1065 MODULE_ALIAS_GENL_FAMILY("l2tp");