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]);
524 session = l2tp_session_find(net, tunnel, session_id);
530 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
534 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
536 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
540 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
541 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
546 if (tunnel->version > 2) {
547 if (info->attrs[L2TP_ATTR_OFFSET])
548 cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
550 if (info->attrs[L2TP_ATTR_DATA_SEQ])
551 cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
553 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
554 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE])
555 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
557 cfg.l2specific_len = 4;
558 if (info->attrs[L2TP_ATTR_L2SPEC_LEN])
559 cfg.l2specific_len = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_LEN]);
561 if (info->attrs[L2TP_ATTR_COOKIE]) {
562 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
567 cfg.cookie_len = len;
568 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
570 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
571 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
576 cfg.peer_cookie_len = len;
577 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
579 if (info->attrs[L2TP_ATTR_IFNAME])
580 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
582 if (info->attrs[L2TP_ATTR_VLAN_ID])
583 cfg.vlan_id = nla_get_u16(info->attrs[L2TP_ATTR_VLAN_ID]);
586 if (info->attrs[L2TP_ATTR_DEBUG])
587 cfg.debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
589 if (info->attrs[L2TP_ATTR_RECV_SEQ])
590 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
592 if (info->attrs[L2TP_ATTR_SEND_SEQ])
593 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
595 if (info->attrs[L2TP_ATTR_LNS_MODE])
596 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
598 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
599 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
601 if (info->attrs[L2TP_ATTR_MTU])
602 cfg.mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
604 if (info->attrs[L2TP_ATTR_MRU])
605 cfg.mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
607 #ifdef CONFIG_MODULES
608 if (l2tp_nl_cmd_ops[cfg.pw_type] == NULL) {
610 request_module("net-l2tp-type-%u", cfg.pw_type);
614 if ((l2tp_nl_cmd_ops[cfg.pw_type] == NULL) ||
615 (l2tp_nl_cmd_ops[cfg.pw_type]->session_create == NULL)) {
616 ret = -EPROTONOSUPPORT;
620 /* Check that pseudowire-specific params are present */
621 switch (cfg.pw_type) {
622 case L2TP_PWTYPE_NONE:
624 case L2TP_PWTYPE_ETH_VLAN:
625 if (!info->attrs[L2TP_ATTR_VLAN_ID]) {
630 case L2TP_PWTYPE_ETH:
632 case L2TP_PWTYPE_PPP:
633 case L2TP_PWTYPE_PPP_AC:
637 ret = -EPROTONOSUPPORT;
641 ret = -EPROTONOSUPPORT;
642 if (l2tp_nl_cmd_ops[cfg.pw_type]->session_create)
643 ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id,
644 session_id, peer_session_id, &cfg);
647 session = l2tp_session_get(net, tunnel, session_id, false);
649 ret = l2tp_session_notify(&l2tp_nl_family, info, session,
650 L2TP_CMD_SESSION_CREATE);
651 l2tp_session_dec_refcount(session);
659 static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
662 struct l2tp_session *session;
665 session = l2tp_nl_session_get(info, true);
666 if (session == NULL) {
671 l2tp_session_notify(&l2tp_nl_family, info,
672 session, L2TP_CMD_SESSION_DELETE);
674 pw_type = session->pwtype;
675 if (pw_type < __L2TP_PWTYPE_MAX)
676 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
677 ret = (*l2tp_nl_cmd_ops[pw_type]->session_delete)(session);
680 session->deref(session);
681 l2tp_session_dec_refcount(session);
687 static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
690 struct l2tp_session *session;
692 session = l2tp_nl_session_get(info, false);
693 if (session == NULL) {
698 if (info->attrs[L2TP_ATTR_DEBUG])
699 session->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
701 if (info->attrs[L2TP_ATTR_DATA_SEQ])
702 session->data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
704 if (info->attrs[L2TP_ATTR_RECV_SEQ])
705 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
707 if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
708 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
709 l2tp_session_set_header_len(session, session->tunnel->version);
712 if (info->attrs[L2TP_ATTR_LNS_MODE])
713 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
715 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
716 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
718 if (info->attrs[L2TP_ATTR_MTU])
719 session->mtu = nla_get_u16(info->attrs[L2TP_ATTR_MTU]);
721 if (info->attrs[L2TP_ATTR_MRU])
722 session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
724 ret = l2tp_session_notify(&l2tp_nl_family, info,
725 session, L2TP_CMD_SESSION_MODIFY);
727 l2tp_session_dec_refcount(session);
733 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
734 struct l2tp_session *session, u8 cmd)
738 struct l2tp_tunnel *tunnel = session->tunnel;
739 struct sock *sk = NULL;
743 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
747 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
748 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
749 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
750 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID,
751 session->peer_session_id) ||
752 nla_put_u32(skb, L2TP_ATTR_DEBUG, session->debug) ||
753 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype) ||
754 nla_put_u16(skb, L2TP_ATTR_MTU, session->mtu) ||
756 nla_put_u16(skb, L2TP_ATTR_MRU, session->mru)))
757 goto nla_put_failure;
759 if ((session->ifname[0] &&
760 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
761 (session->cookie_len &&
762 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
763 &session->cookie[0])) ||
764 (session->peer_cookie_len &&
765 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len,
766 &session->peer_cookie[0])) ||
767 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
768 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
769 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
771 (((sk) && (sk->sk_policy[0] || sk->sk_policy[1])) &&
772 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
774 (session->reorder_timeout &&
775 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT,
776 session->reorder_timeout, L2TP_ATTR_PAD)))
777 goto nla_put_failure;
779 nest = nla_nest_start(skb, L2TP_ATTR_STATS);
781 goto nla_put_failure;
783 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
784 atomic_long_read(&session->stats.tx_packets),
785 L2TP_ATTR_STATS_PAD) ||
786 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
787 atomic_long_read(&session->stats.tx_bytes),
788 L2TP_ATTR_STATS_PAD) ||
789 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
790 atomic_long_read(&session->stats.tx_errors),
791 L2TP_ATTR_STATS_PAD) ||
792 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
793 atomic_long_read(&session->stats.rx_packets),
794 L2TP_ATTR_STATS_PAD) ||
795 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
796 atomic_long_read(&session->stats.rx_bytes),
797 L2TP_ATTR_STATS_PAD) ||
798 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
799 atomic_long_read(&session->stats.rx_seq_discards),
800 L2TP_ATTR_STATS_PAD) ||
801 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
802 atomic_long_read(&session->stats.rx_oos_packets),
803 L2TP_ATTR_STATS_PAD) ||
804 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
805 atomic_long_read(&session->stats.rx_errors),
806 L2TP_ATTR_STATS_PAD))
807 goto nla_put_failure;
808 nla_nest_end(skb, nest);
810 genlmsg_end(skb, hdr);
814 genlmsg_cancel(skb, hdr);
818 static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
820 struct l2tp_session *session;
824 session = l2tp_nl_session_get(info, false);
825 if (session == NULL) {
830 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
836 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
837 0, session, L2TP_CMD_SESSION_GET);
841 ret = genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
843 l2tp_session_dec_refcount(session);
850 l2tp_session_dec_refcount(session);
855 static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
857 struct net *net = sock_net(skb->sk);
858 struct l2tp_session *session;
859 struct l2tp_tunnel *tunnel = NULL;
860 int ti = cb->args[0];
861 int si = cb->args[1];
864 if (tunnel == NULL) {
865 tunnel = l2tp_tunnel_find_nth(net, ti);
870 session = l2tp_session_get_nth(tunnel, si, false);
871 if (session == NULL) {
878 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
879 cb->nlh->nlmsg_seq, NLM_F_MULTI,
880 session, L2TP_CMD_SESSION_GET) < 0) {
881 l2tp_session_dec_refcount(session);
884 l2tp_session_dec_refcount(session);
896 static const struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
897 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
898 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
899 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
900 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
901 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
902 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
903 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
904 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
905 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
906 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
907 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
908 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
909 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
910 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
911 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
912 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
913 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
914 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
915 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
916 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
917 [L2TP_ATTR_FD] = { .type = NLA_U32, },
918 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
919 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
920 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
921 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
922 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
923 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
924 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
925 [L2TP_ATTR_IP6_SADDR] = {
927 .len = sizeof(struct in6_addr),
929 [L2TP_ATTR_IP6_DADDR] = {
931 .len = sizeof(struct in6_addr),
933 [L2TP_ATTR_IFNAME] = {
934 .type = NLA_NUL_STRING,
937 [L2TP_ATTR_COOKIE] = {
941 [L2TP_ATTR_PEER_COOKIE] = {
947 static const struct genl_ops l2tp_nl_ops[] = {
949 .cmd = L2TP_CMD_NOOP,
950 .doit = l2tp_nl_cmd_noop,
951 .policy = l2tp_nl_policy,
952 /* can be retrieved by unprivileged users */
955 .cmd = L2TP_CMD_TUNNEL_CREATE,
956 .doit = l2tp_nl_cmd_tunnel_create,
957 .policy = l2tp_nl_policy,
958 .flags = GENL_ADMIN_PERM,
961 .cmd = L2TP_CMD_TUNNEL_DELETE,
962 .doit = l2tp_nl_cmd_tunnel_delete,
963 .policy = l2tp_nl_policy,
964 .flags = GENL_ADMIN_PERM,
967 .cmd = L2TP_CMD_TUNNEL_MODIFY,
968 .doit = l2tp_nl_cmd_tunnel_modify,
969 .policy = l2tp_nl_policy,
970 .flags = GENL_ADMIN_PERM,
973 .cmd = L2TP_CMD_TUNNEL_GET,
974 .doit = l2tp_nl_cmd_tunnel_get,
975 .dumpit = l2tp_nl_cmd_tunnel_dump,
976 .policy = l2tp_nl_policy,
977 .flags = GENL_ADMIN_PERM,
980 .cmd = L2TP_CMD_SESSION_CREATE,
981 .doit = l2tp_nl_cmd_session_create,
982 .policy = l2tp_nl_policy,
983 .flags = GENL_ADMIN_PERM,
986 .cmd = L2TP_CMD_SESSION_DELETE,
987 .doit = l2tp_nl_cmd_session_delete,
988 .policy = l2tp_nl_policy,
989 .flags = GENL_ADMIN_PERM,
992 .cmd = L2TP_CMD_SESSION_MODIFY,
993 .doit = l2tp_nl_cmd_session_modify,
994 .policy = l2tp_nl_policy,
995 .flags = GENL_ADMIN_PERM,
998 .cmd = L2TP_CMD_SESSION_GET,
999 .doit = l2tp_nl_cmd_session_get,
1000 .dumpit = l2tp_nl_cmd_session_dump,
1001 .policy = l2tp_nl_policy,
1002 .flags = GENL_ADMIN_PERM,
1006 static struct genl_family l2tp_nl_family __ro_after_init = {
1007 .name = L2TP_GENL_NAME,
1008 .version = L2TP_GENL_VERSION,
1010 .maxattr = L2TP_ATTR_MAX,
1012 .module = THIS_MODULE,
1014 .n_ops = ARRAY_SIZE(l2tp_nl_ops),
1015 .mcgrps = l2tp_multicast_group,
1016 .n_mcgrps = ARRAY_SIZE(l2tp_multicast_group),
1019 int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
1024 if (pw_type >= __L2TP_PWTYPE_MAX)
1029 if (l2tp_nl_cmd_ops[pw_type])
1032 l2tp_nl_cmd_ops[pw_type] = ops;
1040 EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
1042 void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
1044 if (pw_type < __L2TP_PWTYPE_MAX) {
1046 l2tp_nl_cmd_ops[pw_type] = NULL;
1050 EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
1052 static int __init l2tp_nl_init(void)
1054 pr_info("L2TP netlink interface\n");
1055 return genl_register_family(&l2tp_nl_family);
1058 static void l2tp_nl_cleanup(void)
1060 genl_unregister_family(&l2tp_nl_family);
1063 module_init(l2tp_nl_init);
1064 module_exit(l2tp_nl_cleanup);
1066 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1067 MODULE_DESCRIPTION("L2TP netlink");
1068 MODULE_LICENSE("GPL");
1069 MODULE_VERSION("1.0");
1070 MODULE_ALIAS_GENL_FAMILY("l2tp");