1 // SPDX-License-Identifier: GPL-2.0-only
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>
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16 #include <net/genetlink.h>
19 #include <linux/udp.h>
20 #include <linux/socket.h>
21 #include <linux/module.h>
22 #include <linux/list.h>
23 #include <net/net_namespace.h>
25 #include <linux/l2tp.h>
27 #include "l2tp_core.h"
29 static struct genl_family l2tp_nl_family;
31 static const struct genl_multicast_group l2tp_multicast_group[] = {
33 .name = L2TP_GENL_MCGROUP,
37 static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq,
38 int flags, struct l2tp_tunnel *tunnel, u8 cmd);
39 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq,
40 int flags, struct l2tp_session *session,
43 /* Accessed under genl lock */
44 static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
46 static struct l2tp_session *l2tp_nl_session_get(struct genl_info *info)
51 struct l2tp_tunnel *tunnel;
52 struct l2tp_session *session = NULL;
53 struct net *net = genl_info_net(info);
55 if (info->attrs[L2TP_ATTR_IFNAME]) {
56 ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
57 session = l2tp_session_get_by_ifname(net, ifname);
58 } else if ((info->attrs[L2TP_ATTR_SESSION_ID]) &&
59 (info->attrs[L2TP_ATTR_CONN_ID])) {
60 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
61 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
62 tunnel = l2tp_tunnel_get(net, tunnel_id);
64 session = l2tp_tunnel_get_session(tunnel, session_id);
65 l2tp_tunnel_dec_refcount(tunnel);
72 static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
78 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
84 hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
85 &l2tp_nl_family, 0, L2TP_CMD_NOOP);
91 genlmsg_end(msg, hdr);
93 return genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
102 static int l2tp_tunnel_notify(struct genl_family *family,
103 struct genl_info *info,
104 struct l2tp_tunnel *tunnel,
110 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
114 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
115 NLM_F_ACK, tunnel, cmd);
118 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
119 /* We don't care if no one is listening */
130 static int l2tp_session_notify(struct genl_family *family,
131 struct genl_info *info,
132 struct l2tp_session *session,
138 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
142 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
143 NLM_F_ACK, session, cmd);
146 ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
147 /* We don't care if no one is listening */
158 static int l2tp_nl_cmd_tunnel_create_get_addr(struct nlattr **attrs, struct l2tp_tunnel_cfg *cfg)
160 if (attrs[L2TP_ATTR_UDP_SPORT])
161 cfg->local_udp_port = nla_get_u16(attrs[L2TP_ATTR_UDP_SPORT]);
162 if (attrs[L2TP_ATTR_UDP_DPORT])
163 cfg->peer_udp_port = nla_get_u16(attrs[L2TP_ATTR_UDP_DPORT]);
164 cfg->use_udp_checksums = nla_get_flag(attrs[L2TP_ATTR_UDP_CSUM]);
166 /* Must have either AF_INET or AF_INET6 address for source and destination */
167 #if IS_ENABLED(CONFIG_IPV6)
168 if (attrs[L2TP_ATTR_IP6_SADDR] && attrs[L2TP_ATTR_IP6_DADDR]) {
169 cfg->local_ip6 = nla_data(attrs[L2TP_ATTR_IP6_SADDR]);
170 cfg->peer_ip6 = nla_data(attrs[L2TP_ATTR_IP6_DADDR]);
171 cfg->udp6_zero_tx_checksums = nla_get_flag(attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX]);
172 cfg->udp6_zero_rx_checksums = nla_get_flag(attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX]);
176 if (attrs[L2TP_ATTR_IP_SADDR] && attrs[L2TP_ATTR_IP_DADDR]) {
177 cfg->local_ip.s_addr = nla_get_in_addr(attrs[L2TP_ATTR_IP_SADDR]);
178 cfg->peer_ip.s_addr = nla_get_in_addr(attrs[L2TP_ATTR_IP_DADDR]);
184 static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
191 struct l2tp_tunnel_cfg cfg = { 0, };
192 struct l2tp_tunnel *tunnel;
193 struct net *net = genl_info_net(info);
194 struct nlattr **attrs = info->attrs;
196 if (!attrs[L2TP_ATTR_CONN_ID]) {
200 tunnel_id = nla_get_u32(attrs[L2TP_ATTR_CONN_ID]);
202 if (!attrs[L2TP_ATTR_PEER_CONN_ID]) {
206 peer_tunnel_id = nla_get_u32(attrs[L2TP_ATTR_PEER_CONN_ID]);
208 if (!attrs[L2TP_ATTR_PROTO_VERSION]) {
212 proto_version = nla_get_u8(attrs[L2TP_ATTR_PROTO_VERSION]);
214 if (!attrs[L2TP_ATTR_ENCAP_TYPE]) {
218 cfg.encap = nla_get_u16(attrs[L2TP_ATTR_ENCAP_TYPE]);
220 /* Managed tunnels take the tunnel socket from userspace.
221 * Unmanaged tunnels must call out the source and destination addresses
222 * for the kernel to create the tunnel socket itself.
224 if (attrs[L2TP_ATTR_FD]) {
225 fd = nla_get_u32(attrs[L2TP_ATTR_FD]);
227 ret = l2tp_nl_cmd_tunnel_create_get_addr(attrs, &cfg);
234 case L2TP_ENCAPTYPE_UDP:
235 case L2TP_ENCAPTYPE_IP:
236 ret = l2tp_tunnel_create(fd, proto_version, tunnel_id,
237 peer_tunnel_id, &cfg, &tunnel);
244 l2tp_tunnel_inc_refcount(tunnel);
245 ret = l2tp_tunnel_register(tunnel, net, &cfg);
250 ret = l2tp_tunnel_notify(&l2tp_nl_family, info, tunnel,
251 L2TP_CMD_TUNNEL_CREATE);
252 l2tp_tunnel_dec_refcount(tunnel);
258 static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info)
260 struct l2tp_tunnel *tunnel;
263 struct net *net = genl_info_net(info);
265 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
269 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
271 tunnel = l2tp_tunnel_get(net, tunnel_id);
277 l2tp_tunnel_notify(&l2tp_nl_family, info,
278 tunnel, L2TP_CMD_TUNNEL_DELETE);
280 l2tp_tunnel_delete(tunnel);
282 l2tp_tunnel_dec_refcount(tunnel);
288 static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info)
290 struct l2tp_tunnel *tunnel;
293 struct net *net = genl_info_net(info);
295 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
299 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
301 tunnel = l2tp_tunnel_get(net, tunnel_id);
307 ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
308 tunnel, L2TP_CMD_TUNNEL_MODIFY);
310 l2tp_tunnel_dec_refcount(tunnel);
316 #if IS_ENABLED(CONFIG_IPV6)
317 static int l2tp_nl_tunnel_send_addr6(struct sk_buff *skb, struct sock *sk,
318 enum l2tp_encap_type encap)
320 struct inet_sock *inet = inet_sk(sk);
321 struct ipv6_pinfo *np = inet6_sk(sk);
324 case L2TP_ENCAPTYPE_UDP:
325 if (udp_get_no_check6_tx(sk) &&
326 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_TX))
328 if (udp_get_no_check6_rx(sk) &&
329 nla_put_flag(skb, L2TP_ATTR_UDP_ZERO_CSUM6_RX))
331 if (nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
332 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)))
335 case L2TP_ENCAPTYPE_IP:
336 if (nla_put_in6_addr(skb, L2TP_ATTR_IP6_SADDR, &np->saddr) ||
337 nla_put_in6_addr(skb, L2TP_ATTR_IP6_DADDR, &sk->sk_v6_daddr))
345 static int l2tp_nl_tunnel_send_addr4(struct sk_buff *skb, struct sock *sk,
346 enum l2tp_encap_type encap)
348 struct inet_sock *inet = inet_sk(sk);
351 case L2TP_ENCAPTYPE_UDP:
352 if (nla_put_u8(skb, L2TP_ATTR_UDP_CSUM, !sk->sk_no_check_tx) ||
353 nla_put_u16(skb, L2TP_ATTR_UDP_SPORT, ntohs(inet->inet_sport)) ||
354 nla_put_u16(skb, L2TP_ATTR_UDP_DPORT, ntohs(inet->inet_dport)))
357 case L2TP_ENCAPTYPE_IP:
358 if (nla_put_in_addr(skb, L2TP_ATTR_IP_SADDR, inet->inet_saddr) ||
359 nla_put_in_addr(skb, L2TP_ATTR_IP_DADDR, inet->inet_daddr))
367 /* Append attributes for the tunnel address, handling the different attribute types
368 * used for different tunnel encapsulation and AF_INET v.s. AF_INET6.
370 static int l2tp_nl_tunnel_send_addr(struct sk_buff *skb, struct l2tp_tunnel *tunnel)
372 struct sock *sk = tunnel->sock;
377 #if IS_ENABLED(CONFIG_IPV6)
378 if (sk->sk_family == AF_INET6)
379 return l2tp_nl_tunnel_send_addr6(skb, sk, tunnel->encap);
381 return l2tp_nl_tunnel_send_addr4(skb, sk, tunnel->encap);
384 static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
385 struct l2tp_tunnel *tunnel, u8 cmd)
390 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
394 if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
395 nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
396 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
397 nla_put_u32(skb, L2TP_ATTR_DEBUG, 0) ||
398 nla_put_u16(skb, L2TP_ATTR_ENCAP_TYPE, tunnel->encap))
399 goto nla_put_failure;
401 nest = nla_nest_start_noflag(skb, L2TP_ATTR_STATS);
403 goto nla_put_failure;
405 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
406 atomic_long_read(&tunnel->stats.tx_packets),
407 L2TP_ATTR_STATS_PAD) ||
408 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
409 atomic_long_read(&tunnel->stats.tx_bytes),
410 L2TP_ATTR_STATS_PAD) ||
411 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
412 atomic_long_read(&tunnel->stats.tx_errors),
413 L2TP_ATTR_STATS_PAD) ||
414 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
415 atomic_long_read(&tunnel->stats.rx_packets),
416 L2TP_ATTR_STATS_PAD) ||
417 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
418 atomic_long_read(&tunnel->stats.rx_bytes),
419 L2TP_ATTR_STATS_PAD) ||
420 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
421 atomic_long_read(&tunnel->stats.rx_seq_discards),
422 L2TP_ATTR_STATS_PAD) ||
423 nla_put_u64_64bit(skb, L2TP_ATTR_RX_COOKIE_DISCARDS,
424 atomic_long_read(&tunnel->stats.rx_cookie_discards),
425 L2TP_ATTR_STATS_PAD) ||
426 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
427 atomic_long_read(&tunnel->stats.rx_oos_packets),
428 L2TP_ATTR_STATS_PAD) ||
429 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
430 atomic_long_read(&tunnel->stats.rx_errors),
431 L2TP_ATTR_STATS_PAD))
432 goto nla_put_failure;
433 nla_nest_end(skb, nest);
435 if (l2tp_nl_tunnel_send_addr(skb, tunnel))
436 goto nla_put_failure;
438 genlmsg_end(skb, hdr);
442 genlmsg_cancel(skb, hdr);
446 static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
448 struct l2tp_tunnel *tunnel;
452 struct net *net = genl_info_net(info);
454 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
459 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
461 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
467 tunnel = l2tp_tunnel_get(net, tunnel_id);
473 ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
474 NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET);
476 goto err_nlmsg_tunnel;
478 l2tp_tunnel_dec_refcount(tunnel);
480 return genlmsg_unicast(net, msg, info->snd_portid);
483 l2tp_tunnel_dec_refcount(tunnel);
490 static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback *cb)
492 int ti = cb->args[0];
493 struct l2tp_tunnel *tunnel;
494 struct net *net = sock_net(skb->sk);
497 tunnel = l2tp_tunnel_get_nth(net, ti);
501 if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
502 cb->nlh->nlmsg_seq, NLM_F_MULTI,
503 tunnel, L2TP_CMD_TUNNEL_GET) < 0) {
504 l2tp_tunnel_dec_refcount(tunnel);
507 l2tp_tunnel_dec_refcount(tunnel);
518 static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *info)
524 struct l2tp_tunnel *tunnel;
525 struct l2tp_session *session;
526 struct l2tp_session_cfg cfg = { 0, };
527 struct net *net = genl_info_net(info);
529 if (!info->attrs[L2TP_ATTR_CONN_ID]) {
534 tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
535 tunnel = l2tp_tunnel_get(net, tunnel_id);
541 if (!info->attrs[L2TP_ATTR_SESSION_ID]) {
545 session_id = nla_get_u32(info->attrs[L2TP_ATTR_SESSION_ID]);
547 if (!info->attrs[L2TP_ATTR_PEER_SESSION_ID]) {
551 peer_session_id = nla_get_u32(info->attrs[L2TP_ATTR_PEER_SESSION_ID]);
553 if (!info->attrs[L2TP_ATTR_PW_TYPE]) {
557 cfg.pw_type = nla_get_u16(info->attrs[L2TP_ATTR_PW_TYPE]);
558 if (cfg.pw_type >= __L2TP_PWTYPE_MAX) {
563 /* L2TPv2 only accepts PPP pseudo-wires */
564 if (tunnel->version == 2 && cfg.pw_type != L2TP_PWTYPE_PPP) {
565 ret = -EPROTONOSUPPORT;
569 if (tunnel->version > 2) {
570 if (info->attrs[L2TP_ATTR_L2SPEC_TYPE]) {
571 cfg.l2specific_type = nla_get_u8(info->attrs[L2TP_ATTR_L2SPEC_TYPE]);
572 if (cfg.l2specific_type != L2TP_L2SPECTYPE_DEFAULT &&
573 cfg.l2specific_type != L2TP_L2SPECTYPE_NONE) {
578 cfg.l2specific_type = L2TP_L2SPECTYPE_DEFAULT;
581 if (info->attrs[L2TP_ATTR_COOKIE]) {
582 u16 len = nla_len(info->attrs[L2TP_ATTR_COOKIE]);
588 cfg.cookie_len = len;
589 memcpy(&cfg.cookie[0], nla_data(info->attrs[L2TP_ATTR_COOKIE]), len);
591 if (info->attrs[L2TP_ATTR_PEER_COOKIE]) {
592 u16 len = nla_len(info->attrs[L2TP_ATTR_PEER_COOKIE]);
598 cfg.peer_cookie_len = len;
599 memcpy(&cfg.peer_cookie[0], nla_data(info->attrs[L2TP_ATTR_PEER_COOKIE]), len);
601 if (info->attrs[L2TP_ATTR_IFNAME])
602 cfg.ifname = nla_data(info->attrs[L2TP_ATTR_IFNAME]);
605 if (info->attrs[L2TP_ATTR_RECV_SEQ])
606 cfg.recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
608 if (info->attrs[L2TP_ATTR_SEND_SEQ])
609 cfg.send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
611 if (info->attrs[L2TP_ATTR_LNS_MODE])
612 cfg.lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
614 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
615 cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
617 #ifdef CONFIG_MODULES
618 if (!l2tp_nl_cmd_ops[cfg.pw_type]) {
620 request_module("net-l2tp-type-%u", cfg.pw_type);
624 if (!l2tp_nl_cmd_ops[cfg.pw_type] || !l2tp_nl_cmd_ops[cfg.pw_type]->session_create) {
625 ret = -EPROTONOSUPPORT;
629 ret = l2tp_nl_cmd_ops[cfg.pw_type]->session_create(net, tunnel,
635 session = l2tp_tunnel_get_session(tunnel, session_id);
637 ret = l2tp_session_notify(&l2tp_nl_family, info, session,
638 L2TP_CMD_SESSION_CREATE);
639 l2tp_session_dec_refcount(session);
644 l2tp_tunnel_dec_refcount(tunnel);
649 static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *info)
652 struct l2tp_session *session;
655 session = l2tp_nl_session_get(info);
661 l2tp_session_notify(&l2tp_nl_family, info,
662 session, L2TP_CMD_SESSION_DELETE);
664 pw_type = session->pwtype;
665 if (pw_type < __L2TP_PWTYPE_MAX)
666 if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
667 l2tp_nl_cmd_ops[pw_type]->session_delete(session);
669 l2tp_session_dec_refcount(session);
675 static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *info)
678 struct l2tp_session *session;
680 session = l2tp_nl_session_get(info);
686 if (info->attrs[L2TP_ATTR_RECV_SEQ])
687 session->recv_seq = nla_get_u8(info->attrs[L2TP_ATTR_RECV_SEQ]);
689 if (info->attrs[L2TP_ATTR_SEND_SEQ]) {
690 session->send_seq = nla_get_u8(info->attrs[L2TP_ATTR_SEND_SEQ]);
691 l2tp_session_set_header_len(session, session->tunnel->version);
694 if (info->attrs[L2TP_ATTR_LNS_MODE])
695 session->lns_mode = nla_get_u8(info->attrs[L2TP_ATTR_LNS_MODE]);
697 if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
698 session->reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);
700 ret = l2tp_session_notify(&l2tp_nl_family, info,
701 session, L2TP_CMD_SESSION_MODIFY);
703 l2tp_session_dec_refcount(session);
709 static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
710 struct l2tp_session *session, u8 cmd)
714 struct l2tp_tunnel *tunnel = session->tunnel;
716 hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
720 if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
721 nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||
722 nla_put_u32(skb, L2TP_ATTR_PEER_CONN_ID, tunnel->peer_tunnel_id) ||
723 nla_put_u32(skb, L2TP_ATTR_PEER_SESSION_ID, session->peer_session_id) ||
724 nla_put_u32(skb, L2TP_ATTR_DEBUG, 0) ||
725 nla_put_u16(skb, L2TP_ATTR_PW_TYPE, session->pwtype))
726 goto nla_put_failure;
728 if ((session->ifname[0] &&
729 nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
730 (session->cookie_len &&
731 nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len, session->cookie)) ||
732 (session->peer_cookie_len &&
733 nla_put(skb, L2TP_ATTR_PEER_COOKIE, session->peer_cookie_len, session->peer_cookie)) ||
734 nla_put_u8(skb, L2TP_ATTR_RECV_SEQ, session->recv_seq) ||
735 nla_put_u8(skb, L2TP_ATTR_SEND_SEQ, session->send_seq) ||
736 nla_put_u8(skb, L2TP_ATTR_LNS_MODE, session->lns_mode) ||
737 (l2tp_tunnel_uses_xfrm(tunnel) &&
738 nla_put_u8(skb, L2TP_ATTR_USING_IPSEC, 1)) ||
739 (session->reorder_timeout &&
740 nla_put_msecs(skb, L2TP_ATTR_RECV_TIMEOUT,
741 session->reorder_timeout, L2TP_ATTR_PAD)))
742 goto nla_put_failure;
744 nest = nla_nest_start_noflag(skb, L2TP_ATTR_STATS);
746 goto nla_put_failure;
748 if (nla_put_u64_64bit(skb, L2TP_ATTR_TX_PACKETS,
749 atomic_long_read(&session->stats.tx_packets),
750 L2TP_ATTR_STATS_PAD) ||
751 nla_put_u64_64bit(skb, L2TP_ATTR_TX_BYTES,
752 atomic_long_read(&session->stats.tx_bytes),
753 L2TP_ATTR_STATS_PAD) ||
754 nla_put_u64_64bit(skb, L2TP_ATTR_TX_ERRORS,
755 atomic_long_read(&session->stats.tx_errors),
756 L2TP_ATTR_STATS_PAD) ||
757 nla_put_u64_64bit(skb, L2TP_ATTR_RX_PACKETS,
758 atomic_long_read(&session->stats.rx_packets),
759 L2TP_ATTR_STATS_PAD) ||
760 nla_put_u64_64bit(skb, L2TP_ATTR_RX_BYTES,
761 atomic_long_read(&session->stats.rx_bytes),
762 L2TP_ATTR_STATS_PAD) ||
763 nla_put_u64_64bit(skb, L2TP_ATTR_RX_SEQ_DISCARDS,
764 atomic_long_read(&session->stats.rx_seq_discards),
765 L2TP_ATTR_STATS_PAD) ||
766 nla_put_u64_64bit(skb, L2TP_ATTR_RX_COOKIE_DISCARDS,
767 atomic_long_read(&session->stats.rx_cookie_discards),
768 L2TP_ATTR_STATS_PAD) ||
769 nla_put_u64_64bit(skb, L2TP_ATTR_RX_OOS_PACKETS,
770 atomic_long_read(&session->stats.rx_oos_packets),
771 L2TP_ATTR_STATS_PAD) ||
772 nla_put_u64_64bit(skb, L2TP_ATTR_RX_ERRORS,
773 atomic_long_read(&session->stats.rx_errors),
774 L2TP_ATTR_STATS_PAD))
775 goto nla_put_failure;
776 nla_nest_end(skb, nest);
778 genlmsg_end(skb, hdr);
782 genlmsg_cancel(skb, hdr);
786 static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
788 struct l2tp_session *session;
792 session = l2tp_nl_session_get(info);
798 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
804 ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
805 0, session, L2TP_CMD_SESSION_GET);
809 ret = genlmsg_unicast(genl_info_net(info), msg, info->snd_portid);
811 l2tp_session_dec_refcount(session);
818 l2tp_session_dec_refcount(session);
823 static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback *cb)
825 struct net *net = sock_net(skb->sk);
826 struct l2tp_session *session;
827 struct l2tp_tunnel *tunnel = NULL;
828 int ti = cb->args[0];
829 int si = cb->args[1];
833 tunnel = l2tp_tunnel_get_nth(net, ti);
838 session = l2tp_session_get_nth(tunnel, si);
841 l2tp_tunnel_dec_refcount(tunnel);
847 if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
848 cb->nlh->nlmsg_seq, NLM_F_MULTI,
849 session, L2TP_CMD_SESSION_GET) < 0) {
850 l2tp_session_dec_refcount(session);
851 l2tp_tunnel_dec_refcount(tunnel);
854 l2tp_session_dec_refcount(session);
866 static const struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
867 [L2TP_ATTR_NONE] = { .type = NLA_UNSPEC, },
868 [L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
869 [L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
870 [L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
871 [L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
872 [L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
873 [L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
874 [L2TP_ATTR_PROTO_VERSION] = { .type = NLA_U8, },
875 [L2TP_ATTR_CONN_ID] = { .type = NLA_U32, },
876 [L2TP_ATTR_PEER_CONN_ID] = { .type = NLA_U32, },
877 [L2TP_ATTR_SESSION_ID] = { .type = NLA_U32, },
878 [L2TP_ATTR_PEER_SESSION_ID] = { .type = NLA_U32, },
879 [L2TP_ATTR_UDP_CSUM] = { .type = NLA_U8, },
880 [L2TP_ATTR_VLAN_ID] = { .type = NLA_U16, },
881 [L2TP_ATTR_DEBUG] = { .type = NLA_U32, },
882 [L2TP_ATTR_RECV_SEQ] = { .type = NLA_U8, },
883 [L2TP_ATTR_SEND_SEQ] = { .type = NLA_U8, },
884 [L2TP_ATTR_LNS_MODE] = { .type = NLA_U8, },
885 [L2TP_ATTR_USING_IPSEC] = { .type = NLA_U8, },
886 [L2TP_ATTR_RECV_TIMEOUT] = { .type = NLA_MSECS, },
887 [L2TP_ATTR_FD] = { .type = NLA_U32, },
888 [L2TP_ATTR_IP_SADDR] = { .type = NLA_U32, },
889 [L2TP_ATTR_IP_DADDR] = { .type = NLA_U32, },
890 [L2TP_ATTR_UDP_SPORT] = { .type = NLA_U16, },
891 [L2TP_ATTR_UDP_DPORT] = { .type = NLA_U16, },
892 [L2TP_ATTR_MTU] = { .type = NLA_U16, },
893 [L2TP_ATTR_MRU] = { .type = NLA_U16, },
894 [L2TP_ATTR_STATS] = { .type = NLA_NESTED, },
895 [L2TP_ATTR_IP6_SADDR] = {
897 .len = sizeof(struct in6_addr),
899 [L2TP_ATTR_IP6_DADDR] = {
901 .len = sizeof(struct in6_addr),
903 [L2TP_ATTR_IFNAME] = {
904 .type = NLA_NUL_STRING,
907 [L2TP_ATTR_COOKIE] = {
911 [L2TP_ATTR_PEER_COOKIE] = {
917 static const struct genl_small_ops l2tp_nl_ops[] = {
919 .cmd = L2TP_CMD_NOOP,
920 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
921 .doit = l2tp_nl_cmd_noop,
922 /* can be retrieved by unprivileged users */
925 .cmd = L2TP_CMD_TUNNEL_CREATE,
926 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
927 .doit = l2tp_nl_cmd_tunnel_create,
928 .flags = GENL_UNS_ADMIN_PERM,
931 .cmd = L2TP_CMD_TUNNEL_DELETE,
932 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
933 .doit = l2tp_nl_cmd_tunnel_delete,
934 .flags = GENL_UNS_ADMIN_PERM,
937 .cmd = L2TP_CMD_TUNNEL_MODIFY,
938 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
939 .doit = l2tp_nl_cmd_tunnel_modify,
940 .flags = GENL_UNS_ADMIN_PERM,
943 .cmd = L2TP_CMD_TUNNEL_GET,
944 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
945 .doit = l2tp_nl_cmd_tunnel_get,
946 .dumpit = l2tp_nl_cmd_tunnel_dump,
947 .flags = GENL_UNS_ADMIN_PERM,
950 .cmd = L2TP_CMD_SESSION_CREATE,
951 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
952 .doit = l2tp_nl_cmd_session_create,
953 .flags = GENL_UNS_ADMIN_PERM,
956 .cmd = L2TP_CMD_SESSION_DELETE,
957 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
958 .doit = l2tp_nl_cmd_session_delete,
959 .flags = GENL_UNS_ADMIN_PERM,
962 .cmd = L2TP_CMD_SESSION_MODIFY,
963 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
964 .doit = l2tp_nl_cmd_session_modify,
965 .flags = GENL_UNS_ADMIN_PERM,
968 .cmd = L2TP_CMD_SESSION_GET,
969 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
970 .doit = l2tp_nl_cmd_session_get,
971 .dumpit = l2tp_nl_cmd_session_dump,
972 .flags = GENL_UNS_ADMIN_PERM,
976 static struct genl_family l2tp_nl_family __ro_after_init = {
977 .name = L2TP_GENL_NAME,
978 .version = L2TP_GENL_VERSION,
980 .maxattr = L2TP_ATTR_MAX,
981 .policy = l2tp_nl_policy,
983 .module = THIS_MODULE,
984 .small_ops = l2tp_nl_ops,
985 .n_small_ops = ARRAY_SIZE(l2tp_nl_ops),
986 .mcgrps = l2tp_multicast_group,
987 .n_mcgrps = ARRAY_SIZE(l2tp_multicast_group),
990 int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops)
995 if (pw_type >= __L2TP_PWTYPE_MAX)
1000 if (l2tp_nl_cmd_ops[pw_type])
1003 l2tp_nl_cmd_ops[pw_type] = ops;
1011 EXPORT_SYMBOL_GPL(l2tp_nl_register_ops);
1013 void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type)
1015 if (pw_type < __L2TP_PWTYPE_MAX) {
1017 l2tp_nl_cmd_ops[pw_type] = NULL;
1021 EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
1023 static int __init l2tp_nl_init(void)
1025 pr_info("L2TP netlink interface\n");
1026 return genl_register_family(&l2tp_nl_family);
1029 static void l2tp_nl_cleanup(void)
1031 genl_unregister_family(&l2tp_nl_family);
1034 module_init(l2tp_nl_init);
1035 module_exit(l2tp_nl_cleanup);
1037 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1038 MODULE_DESCRIPTION("L2TP netlink");
1039 MODULE_LICENSE("GPL");
1040 MODULE_VERSION("1.0");
1041 MODULE_ALIAS_GENL_FAMILY("l2tp");