2 * L2TP netlink layer, for management
4 * Copyright (c) 2008,2009,2010 Katalix Systems Ltd
6 * Partly based on the IrDA nelink implementation
7 * (see net/irda/irnetlink.c) which is:
8 * Copyright (c) 2007 Samuel Ortiz <samuel@sortiz.org>
9 * which is in turn partly based on the wireless netlink code:
10 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20 #include <net/genetlink.h>
23 #include <linux/udp.h>
24 #include <linux/socket.h>
25 #include <linux/module.h>
26 #include <linux/list.h>
27 #include <net/net_namespace.h>
29 #include <linux/l2tp.h>
31 #include "l2tp_core.h"
34 static struct genl_family l2tp_nl_family
;
36 static const struct genl_multicast_group l2tp_multicast_group
[] = {
38 .name
= L2TP_GENL_MCGROUP
,
42 static int l2tp_nl_tunnel_send(struct sk_buff
*skb
, u32 portid
, u32 seq
,
43 int flags
, struct l2tp_tunnel
*tunnel
, u8 cmd
);
44 static int l2tp_nl_session_send(struct sk_buff
*skb
, u32 portid
, u32 seq
,
45 int flags
, struct l2tp_session
*session
,
48 /* Accessed under genl lock */
49 static const struct l2tp_nl_cmd_ops
*l2tp_nl_cmd_ops
[__L2TP_PWTYPE_MAX
];
51 static struct l2tp_session
*l2tp_nl_session_get(struct genl_info
*info
)
56 struct l2tp_tunnel
*tunnel
;
57 struct l2tp_session
*session
= NULL
;
58 struct net
*net
= genl_info_net(info
);
60 if (info
->attrs
[L2TP_ATTR_IFNAME
]) {
61 ifname
= nla_data(info
->attrs
[L2TP_ATTR_IFNAME
]);
62 session
= l2tp_session_get_by_ifname(net
, ifname
);
63 } else if ((info
->attrs
[L2TP_ATTR_SESSION_ID
]) &&
64 (info
->attrs
[L2TP_ATTR_CONN_ID
])) {
65 tunnel_id
= nla_get_u32(info
->attrs
[L2TP_ATTR_CONN_ID
]);
66 session_id
= nla_get_u32(info
->attrs
[L2TP_ATTR_SESSION_ID
]);
67 tunnel
= l2tp_tunnel_get(net
, tunnel_id
);
69 session
= l2tp_session_get(net
, tunnel
, session_id
);
70 l2tp_tunnel_dec_refcount(tunnel
);
77 static int l2tp_nl_cmd_noop(struct sk_buff
*skb
, struct genl_info
*info
)
83 msg
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
89 hdr
= genlmsg_put(msg
, info
->snd_portid
, info
->snd_seq
,
90 &l2tp_nl_family
, 0, L2TP_CMD_NOOP
);
96 genlmsg_end(msg
, hdr
);
98 return genlmsg_unicast(genl_info_net(info
), msg
, info
->snd_portid
);
107 static int l2tp_tunnel_notify(struct genl_family
*family
,
108 struct genl_info
*info
,
109 struct l2tp_tunnel
*tunnel
,
115 msg
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
119 ret
= l2tp_nl_tunnel_send(msg
, info
->snd_portid
, info
->snd_seq
,
120 NLM_F_ACK
, tunnel
, cmd
);
123 ret
= genlmsg_multicast_allns(family
, msg
, 0, 0, GFP_ATOMIC
);
124 /* We don't care if no one is listening */
135 static int l2tp_session_notify(struct genl_family
*family
,
136 struct genl_info
*info
,
137 struct l2tp_session
*session
,
143 msg
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
147 ret
= l2tp_nl_session_send(msg
, info
->snd_portid
, info
->snd_seq
,
148 NLM_F_ACK
, session
, cmd
);
151 ret
= genlmsg_multicast_allns(family
, msg
, 0, 0, GFP_ATOMIC
);
152 /* We don't care if no one is listening */
163 static int l2tp_nl_cmd_tunnel_create(struct sk_buff
*skb
, struct genl_info
*info
)
170 struct l2tp_tunnel_cfg cfg
= { 0, };
171 struct l2tp_tunnel
*tunnel
;
172 struct net
*net
= genl_info_net(info
);
174 if (!info
->attrs
[L2TP_ATTR_CONN_ID
]) {
178 tunnel_id
= nla_get_u32(info
->attrs
[L2TP_ATTR_CONN_ID
]);
180 if (!info
->attrs
[L2TP_ATTR_PEER_CONN_ID
]) {
184 peer_tunnel_id
= nla_get_u32(info
->attrs
[L2TP_ATTR_PEER_CONN_ID
]);
186 if (!info
->attrs
[L2TP_ATTR_PROTO_VERSION
]) {
190 proto_version
= nla_get_u8(info
->attrs
[L2TP_ATTR_PROTO_VERSION
]);
192 if (!info
->attrs
[L2TP_ATTR_ENCAP_TYPE
]) {
196 cfg
.encap
= nla_get_u16(info
->attrs
[L2TP_ATTR_ENCAP_TYPE
]);
199 if (info
->attrs
[L2TP_ATTR_FD
]) {
200 fd
= nla_get_u32(info
->attrs
[L2TP_ATTR_FD
]);
202 #if IS_ENABLED(CONFIG_IPV6)
203 if (info
->attrs
[L2TP_ATTR_IP6_SADDR
] &&
204 info
->attrs
[L2TP_ATTR_IP6_DADDR
]) {
205 cfg
.local_ip6
= nla_data(
206 info
->attrs
[L2TP_ATTR_IP6_SADDR
]);
207 cfg
.peer_ip6
= nla_data(
208 info
->attrs
[L2TP_ATTR_IP6_DADDR
]);
211 if (info
->attrs
[L2TP_ATTR_IP_SADDR
] &&
212 info
->attrs
[L2TP_ATTR_IP_DADDR
]) {
213 cfg
.local_ip
.s_addr
= nla_get_in_addr(
214 info
->attrs
[L2TP_ATTR_IP_SADDR
]);
215 cfg
.peer_ip
.s_addr
= nla_get_in_addr(
216 info
->attrs
[L2TP_ATTR_IP_DADDR
]);
221 if (info
->attrs
[L2TP_ATTR_UDP_SPORT
])
222 cfg
.local_udp_port
= nla_get_u16(info
->attrs
[L2TP_ATTR_UDP_SPORT
]);
223 if (info
->attrs
[L2TP_ATTR_UDP_DPORT
])
224 cfg
.peer_udp_port
= nla_get_u16(info
->attrs
[L2TP_ATTR_UDP_DPORT
]);
225 cfg
.use_udp_checksums
= nla_get_flag(
226 info
->attrs
[L2TP_ATTR_UDP_CSUM
]);
228 #if IS_ENABLED(CONFIG_IPV6)
229 cfg
.udp6_zero_tx_checksums
= nla_get_flag(
230 info
->attrs
[L2TP_ATTR_UDP_ZERO_CSUM6_TX
]);
231 cfg
.udp6_zero_rx_checksums
= nla_get_flag(
232 info
->attrs
[L2TP_ATTR_UDP_ZERO_CSUM6_RX
]);
236 if (info
->attrs
[L2TP_ATTR_DEBUG
])
237 cfg
.debug
= nla_get_u32(info
->attrs
[L2TP_ATTR_DEBUG
]);
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_get(net
, tunnel_id
);
280 l2tp_tunnel_notify(&l2tp_nl_family
, info
,
281 tunnel
, L2TP_CMD_TUNNEL_DELETE
);
283 l2tp_tunnel_delete(tunnel
);
285 l2tp_tunnel_dec_refcount(tunnel
);
291 static int l2tp_nl_cmd_tunnel_modify(struct sk_buff
*skb
, struct genl_info
*info
)
293 struct l2tp_tunnel
*tunnel
;
296 struct net
*net
= genl_info_net(info
);
298 if (!info
->attrs
[L2TP_ATTR_CONN_ID
]) {
302 tunnel_id
= nla_get_u32(info
->attrs
[L2TP_ATTR_CONN_ID
]);
304 tunnel
= l2tp_tunnel_get(net
, tunnel_id
);
310 if (info
->attrs
[L2TP_ATTR_DEBUG
])
311 tunnel
->debug
= nla_get_u32(info
->attrs
[L2TP_ATTR_DEBUG
]);
313 ret
= l2tp_tunnel_notify(&l2tp_nl_family
, info
,
314 tunnel
, L2TP_CMD_TUNNEL_MODIFY
);
316 l2tp_tunnel_dec_refcount(tunnel
);
322 static int l2tp_nl_tunnel_send(struct sk_buff
*skb
, u32 portid
, u32 seq
, int flags
,
323 struct l2tp_tunnel
*tunnel
, u8 cmd
)
327 struct sock
*sk
= NULL
;
328 struct inet_sock
*inet
;
329 #if IS_ENABLED(CONFIG_IPV6)
330 struct ipv6_pinfo
*np
= NULL
;
333 hdr
= genlmsg_put(skb
, portid
, seq
, &l2tp_nl_family
, flags
, cmd
);
337 if (nla_put_u8(skb
, L2TP_ATTR_PROTO_VERSION
, tunnel
->version
) ||
338 nla_put_u32(skb
, L2TP_ATTR_CONN_ID
, tunnel
->tunnel_id
) ||
339 nla_put_u32(skb
, L2TP_ATTR_PEER_CONN_ID
, tunnel
->peer_tunnel_id
) ||
340 nla_put_u32(skb
, L2TP_ATTR_DEBUG
, tunnel
->debug
) ||
341 nla_put_u16(skb
, L2TP_ATTR_ENCAP_TYPE
, tunnel
->encap
))
342 goto nla_put_failure
;
344 nest
= nla_nest_start(skb
, L2TP_ATTR_STATS
);
346 goto nla_put_failure
;
348 if (nla_put_u64_64bit(skb
, L2TP_ATTR_TX_PACKETS
,
349 atomic_long_read(&tunnel
->stats
.tx_packets
),
350 L2TP_ATTR_STATS_PAD
) ||
351 nla_put_u64_64bit(skb
, L2TP_ATTR_TX_BYTES
,
352 atomic_long_read(&tunnel
->stats
.tx_bytes
),
353 L2TP_ATTR_STATS_PAD
) ||
354 nla_put_u64_64bit(skb
, L2TP_ATTR_TX_ERRORS
,
355 atomic_long_read(&tunnel
->stats
.tx_errors
),
356 L2TP_ATTR_STATS_PAD
) ||
357 nla_put_u64_64bit(skb
, L2TP_ATTR_RX_PACKETS
,
358 atomic_long_read(&tunnel
->stats
.rx_packets
),
359 L2TP_ATTR_STATS_PAD
) ||
360 nla_put_u64_64bit(skb
, L2TP_ATTR_RX_BYTES
,
361 atomic_long_read(&tunnel
->stats
.rx_bytes
),
362 L2TP_ATTR_STATS_PAD
) ||
363 nla_put_u64_64bit(skb
, L2TP_ATTR_RX_SEQ_DISCARDS
,
364 atomic_long_read(&tunnel
->stats
.rx_seq_discards
),
365 L2TP_ATTR_STATS_PAD
) ||
366 nla_put_u64_64bit(skb
, L2TP_ATTR_RX_OOS_PACKETS
,
367 atomic_long_read(&tunnel
->stats
.rx_oos_packets
),
368 L2TP_ATTR_STATS_PAD
) ||
369 nla_put_u64_64bit(skb
, L2TP_ATTR_RX_ERRORS
,
370 atomic_long_read(&tunnel
->stats
.rx_errors
),
371 L2TP_ATTR_STATS_PAD
))
372 goto nla_put_failure
;
373 nla_nest_end(skb
, nest
);
379 #if IS_ENABLED(CONFIG_IPV6)
380 if (sk
->sk_family
== AF_INET6
)
386 switch (tunnel
->encap
) {
387 case L2TP_ENCAPTYPE_UDP
:
388 switch (sk
->sk_family
) {
390 if (nla_put_u8(skb
, L2TP_ATTR_UDP_CSUM
, !sk
->sk_no_check_tx
))
391 goto nla_put_failure
;
393 #if IS_ENABLED(CONFIG_IPV6)
395 if (udp_get_no_check6_tx(sk
) &&
396 nla_put_flag(skb
, L2TP_ATTR_UDP_ZERO_CSUM6_TX
))
397 goto nla_put_failure
;
398 if (udp_get_no_check6_rx(sk
) &&
399 nla_put_flag(skb
, L2TP_ATTR_UDP_ZERO_CSUM6_RX
))
400 goto nla_put_failure
;
404 if (nla_put_u16(skb
, L2TP_ATTR_UDP_SPORT
, ntohs(inet
->inet_sport
)) ||
405 nla_put_u16(skb
, L2TP_ATTR_UDP_DPORT
, ntohs(inet
->inet_dport
)))
406 goto nla_put_failure
;
408 case L2TP_ENCAPTYPE_IP
:
409 #if IS_ENABLED(CONFIG_IPV6)
411 if (nla_put_in6_addr(skb
, L2TP_ATTR_IP6_SADDR
,
413 nla_put_in6_addr(skb
, L2TP_ATTR_IP6_DADDR
,
415 goto nla_put_failure
;
418 if (nla_put_in_addr(skb
, L2TP_ATTR_IP_SADDR
,
420 nla_put_in_addr(skb
, L2TP_ATTR_IP_DADDR
,
422 goto nla_put_failure
;
427 genlmsg_end(skb
, hdr
);
431 genlmsg_cancel(skb
, hdr
);
435 static int l2tp_nl_cmd_tunnel_get(struct sk_buff
*skb
, struct genl_info
*info
)
437 struct l2tp_tunnel
*tunnel
;
441 struct net
*net
= genl_info_net(info
);
443 if (!info
->attrs
[L2TP_ATTR_CONN_ID
]) {
448 tunnel_id
= nla_get_u32(info
->attrs
[L2TP_ATTR_CONN_ID
]);
450 msg
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
456 tunnel
= l2tp_tunnel_get(net
, tunnel_id
);
462 ret
= l2tp_nl_tunnel_send(msg
, info
->snd_portid
, info
->snd_seq
,
463 NLM_F_ACK
, tunnel
, L2TP_CMD_TUNNEL_GET
);
465 goto err_nlmsg_tunnel
;
467 l2tp_tunnel_dec_refcount(tunnel
);
469 return genlmsg_unicast(net
, msg
, info
->snd_portid
);
472 l2tp_tunnel_dec_refcount(tunnel
);
479 static int l2tp_nl_cmd_tunnel_dump(struct sk_buff
*skb
, struct netlink_callback
*cb
)
481 int ti
= cb
->args
[0];
482 struct l2tp_tunnel
*tunnel
;
483 struct net
*net
= sock_net(skb
->sk
);
486 tunnel
= l2tp_tunnel_find_nth(net
, ti
);
490 if (l2tp_nl_tunnel_send(skb
, NETLINK_CB(cb
->skb
).portid
,
491 cb
->nlh
->nlmsg_seq
, NLM_F_MULTI
,
492 tunnel
, L2TP_CMD_TUNNEL_GET
) < 0)
504 static int l2tp_nl_cmd_session_create(struct sk_buff
*skb
, struct genl_info
*info
)
510 struct l2tp_tunnel
*tunnel
;
511 struct l2tp_session
*session
;
512 struct l2tp_session_cfg cfg
= { 0, };
513 struct net
*net
= genl_info_net(info
);
515 if (!info
->attrs
[L2TP_ATTR_CONN_ID
]) {
520 tunnel_id
= nla_get_u32(info
->attrs
[L2TP_ATTR_CONN_ID
]);
521 tunnel
= l2tp_tunnel_get(net
, tunnel_id
);
527 if (!info
->attrs
[L2TP_ATTR_SESSION_ID
]) {
531 session_id
= nla_get_u32(info
->attrs
[L2TP_ATTR_SESSION_ID
]);
533 if (!info
->attrs
[L2TP_ATTR_PEER_SESSION_ID
]) {
537 peer_session_id
= nla_get_u32(info
->attrs
[L2TP_ATTR_PEER_SESSION_ID
]);
539 if (!info
->attrs
[L2TP_ATTR_PW_TYPE
]) {
543 cfg
.pw_type
= nla_get_u16(info
->attrs
[L2TP_ATTR_PW_TYPE
]);
544 if (cfg
.pw_type
>= __L2TP_PWTYPE_MAX
) {
549 if (tunnel
->version
> 2) {
550 if (info
->attrs
[L2TP_ATTR_OFFSET
])
551 cfg
.offset
= nla_get_u16(info
->attrs
[L2TP_ATTR_OFFSET
]);
553 if (info
->attrs
[L2TP_ATTR_DATA_SEQ
])
554 cfg
.data_seq
= nla_get_u8(info
->attrs
[L2TP_ATTR_DATA_SEQ
]);
556 cfg
.l2specific_type
= L2TP_L2SPECTYPE_DEFAULT
;
557 if (info
->attrs
[L2TP_ATTR_L2SPEC_TYPE
])
558 cfg
.l2specific_type
= nla_get_u8(info
->attrs
[L2TP_ATTR_L2SPEC_TYPE
]);
560 cfg
.l2specific_len
= 4;
561 if (info
->attrs
[L2TP_ATTR_L2SPEC_LEN
])
562 cfg
.l2specific_len
= nla_get_u8(info
->attrs
[L2TP_ATTR_L2SPEC_LEN
]);
564 if (info
->attrs
[L2TP_ATTR_COOKIE
]) {
565 u16 len
= nla_len(info
->attrs
[L2TP_ATTR_COOKIE
]);
570 cfg
.cookie_len
= len
;
571 memcpy(&cfg
.cookie
[0], nla_data(info
->attrs
[L2TP_ATTR_COOKIE
]), len
);
573 if (info
->attrs
[L2TP_ATTR_PEER_COOKIE
]) {
574 u16 len
= nla_len(info
->attrs
[L2TP_ATTR_PEER_COOKIE
]);
579 cfg
.peer_cookie_len
= len
;
580 memcpy(&cfg
.peer_cookie
[0], nla_data(info
->attrs
[L2TP_ATTR_PEER_COOKIE
]), len
);
582 if (info
->attrs
[L2TP_ATTR_IFNAME
])
583 cfg
.ifname
= nla_data(info
->attrs
[L2TP_ATTR_IFNAME
]);
585 if (info
->attrs
[L2TP_ATTR_VLAN_ID
])
586 cfg
.vlan_id
= nla_get_u16(info
->attrs
[L2TP_ATTR_VLAN_ID
]);
589 if (info
->attrs
[L2TP_ATTR_DEBUG
])
590 cfg
.debug
= nla_get_u32(info
->attrs
[L2TP_ATTR_DEBUG
]);
592 if (info
->attrs
[L2TP_ATTR_RECV_SEQ
])
593 cfg
.recv_seq
= nla_get_u8(info
->attrs
[L2TP_ATTR_RECV_SEQ
]);
595 if (info
->attrs
[L2TP_ATTR_SEND_SEQ
])
596 cfg
.send_seq
= nla_get_u8(info
->attrs
[L2TP_ATTR_SEND_SEQ
]);
598 if (info
->attrs
[L2TP_ATTR_LNS_MODE
])
599 cfg
.lns_mode
= nla_get_u8(info
->attrs
[L2TP_ATTR_LNS_MODE
]);
601 if (info
->attrs
[L2TP_ATTR_RECV_TIMEOUT
])
602 cfg
.reorder_timeout
= nla_get_msecs(info
->attrs
[L2TP_ATTR_RECV_TIMEOUT
]);
604 if (info
->attrs
[L2TP_ATTR_MTU
])
605 cfg
.mtu
= nla_get_u16(info
->attrs
[L2TP_ATTR_MTU
]);
607 if (info
->attrs
[L2TP_ATTR_MRU
])
608 cfg
.mru
= nla_get_u16(info
->attrs
[L2TP_ATTR_MRU
]);
610 #ifdef CONFIG_MODULES
611 if (l2tp_nl_cmd_ops
[cfg
.pw_type
] == NULL
) {
613 request_module("net-l2tp-type-%u", cfg
.pw_type
);
617 if ((l2tp_nl_cmd_ops
[cfg
.pw_type
] == NULL
) ||
618 (l2tp_nl_cmd_ops
[cfg
.pw_type
]->session_create
== NULL
)) {
619 ret
= -EPROTONOSUPPORT
;
623 /* Check that pseudowire-specific params are present */
624 switch (cfg
.pw_type
) {
625 case L2TP_PWTYPE_NONE
:
627 case L2TP_PWTYPE_ETH_VLAN
:
628 if (!info
->attrs
[L2TP_ATTR_VLAN_ID
]) {
633 case L2TP_PWTYPE_ETH
:
635 case L2TP_PWTYPE_PPP
:
636 case L2TP_PWTYPE_PPP_AC
:
640 ret
= -EPROTONOSUPPORT
;
644 ret
= l2tp_nl_cmd_ops
[cfg
.pw_type
]->session_create(net
, tunnel
,
650 session
= l2tp_session_get(net
, tunnel
, session_id
);
652 ret
= l2tp_session_notify(&l2tp_nl_family
, info
, session
,
653 L2TP_CMD_SESSION_CREATE
);
654 l2tp_session_dec_refcount(session
);
659 l2tp_tunnel_dec_refcount(tunnel
);
664 static int l2tp_nl_cmd_session_delete(struct sk_buff
*skb
, struct genl_info
*info
)
667 struct l2tp_session
*session
;
670 session
= l2tp_nl_session_get(info
);
671 if (session
== NULL
) {
676 l2tp_session_notify(&l2tp_nl_family
, info
,
677 session
, L2TP_CMD_SESSION_DELETE
);
679 pw_type
= session
->pwtype
;
680 if (pw_type
< __L2TP_PWTYPE_MAX
)
681 if (l2tp_nl_cmd_ops
[pw_type
] && l2tp_nl_cmd_ops
[pw_type
]->session_delete
)
682 ret
= (*l2tp_nl_cmd_ops
[pw_type
]->session_delete
)(session
);
684 l2tp_session_dec_refcount(session
);
690 static int l2tp_nl_cmd_session_modify(struct sk_buff
*skb
, struct genl_info
*info
)
693 struct l2tp_session
*session
;
695 session
= l2tp_nl_session_get(info
);
696 if (session
== NULL
) {
701 if (info
->attrs
[L2TP_ATTR_DEBUG
])
702 session
->debug
= nla_get_u32(info
->attrs
[L2TP_ATTR_DEBUG
]);
704 if (info
->attrs
[L2TP_ATTR_DATA_SEQ
])
705 session
->data_seq
= nla_get_u8(info
->attrs
[L2TP_ATTR_DATA_SEQ
]);
707 if (info
->attrs
[L2TP_ATTR_RECV_SEQ
])
708 session
->recv_seq
= nla_get_u8(info
->attrs
[L2TP_ATTR_RECV_SEQ
]);
710 if (info
->attrs
[L2TP_ATTR_SEND_SEQ
]) {
711 session
->send_seq
= nla_get_u8(info
->attrs
[L2TP_ATTR_SEND_SEQ
]);
712 l2tp_session_set_header_len(session
, session
->tunnel
->version
);
715 if (info
->attrs
[L2TP_ATTR_LNS_MODE
])
716 session
->lns_mode
= nla_get_u8(info
->attrs
[L2TP_ATTR_LNS_MODE
]);
718 if (info
->attrs
[L2TP_ATTR_RECV_TIMEOUT
])
719 session
->reorder_timeout
= nla_get_msecs(info
->attrs
[L2TP_ATTR_RECV_TIMEOUT
]);
721 if (info
->attrs
[L2TP_ATTR_MTU
])
722 session
->mtu
= nla_get_u16(info
->attrs
[L2TP_ATTR_MTU
]);
724 if (info
->attrs
[L2TP_ATTR_MRU
])
725 session
->mru
= nla_get_u16(info
->attrs
[L2TP_ATTR_MRU
]);
727 ret
= l2tp_session_notify(&l2tp_nl_family
, info
,
728 session
, L2TP_CMD_SESSION_MODIFY
);
730 l2tp_session_dec_refcount(session
);
736 static int l2tp_nl_session_send(struct sk_buff
*skb
, u32 portid
, u32 seq
, int flags
,
737 struct l2tp_session
*session
, u8 cmd
)
741 struct l2tp_tunnel
*tunnel
= session
->tunnel
;
742 struct sock
*sk
= NULL
;
746 hdr
= genlmsg_put(skb
, portid
, seq
, &l2tp_nl_family
, flags
, cmd
);
750 if (nla_put_u32(skb
, L2TP_ATTR_CONN_ID
, tunnel
->tunnel_id
) ||
751 nla_put_u32(skb
, L2TP_ATTR_SESSION_ID
, session
->session_id
) ||
752 nla_put_u32(skb
, L2TP_ATTR_PEER_CONN_ID
, tunnel
->peer_tunnel_id
) ||
753 nla_put_u32(skb
, L2TP_ATTR_PEER_SESSION_ID
,
754 session
->peer_session_id
) ||
755 nla_put_u32(skb
, L2TP_ATTR_DEBUG
, session
->debug
) ||
756 nla_put_u16(skb
, L2TP_ATTR_PW_TYPE
, session
->pwtype
) ||
757 nla_put_u16(skb
, L2TP_ATTR_MTU
, session
->mtu
) ||
759 nla_put_u16(skb
, L2TP_ATTR_MRU
, session
->mru
)))
760 goto nla_put_failure
;
762 if ((session
->ifname
[0] &&
763 nla_put_string(skb
, L2TP_ATTR_IFNAME
, session
->ifname
)) ||
764 (session
->cookie_len
&&
765 nla_put(skb
, L2TP_ATTR_COOKIE
, session
->cookie_len
,
766 &session
->cookie
[0])) ||
767 (session
->peer_cookie_len
&&
768 nla_put(skb
, L2TP_ATTR_PEER_COOKIE
, session
->peer_cookie_len
,
769 &session
->peer_cookie
[0])) ||
770 nla_put_u8(skb
, L2TP_ATTR_RECV_SEQ
, session
->recv_seq
) ||
771 nla_put_u8(skb
, L2TP_ATTR_SEND_SEQ
, session
->send_seq
) ||
772 nla_put_u8(skb
, L2TP_ATTR_LNS_MODE
, session
->lns_mode
) ||
774 (((sk
) && (sk
->sk_policy
[0] || sk
->sk_policy
[1])) &&
775 nla_put_u8(skb
, L2TP_ATTR_USING_IPSEC
, 1)) ||
777 (session
->reorder_timeout
&&
778 nla_put_msecs(skb
, L2TP_ATTR_RECV_TIMEOUT
,
779 session
->reorder_timeout
, L2TP_ATTR_PAD
)))
780 goto nla_put_failure
;
782 nest
= nla_nest_start(skb
, L2TP_ATTR_STATS
);
784 goto nla_put_failure
;
786 if (nla_put_u64_64bit(skb
, L2TP_ATTR_TX_PACKETS
,
787 atomic_long_read(&session
->stats
.tx_packets
),
788 L2TP_ATTR_STATS_PAD
) ||
789 nla_put_u64_64bit(skb
, L2TP_ATTR_TX_BYTES
,
790 atomic_long_read(&session
->stats
.tx_bytes
),
791 L2TP_ATTR_STATS_PAD
) ||
792 nla_put_u64_64bit(skb
, L2TP_ATTR_TX_ERRORS
,
793 atomic_long_read(&session
->stats
.tx_errors
),
794 L2TP_ATTR_STATS_PAD
) ||
795 nla_put_u64_64bit(skb
, L2TP_ATTR_RX_PACKETS
,
796 atomic_long_read(&session
->stats
.rx_packets
),
797 L2TP_ATTR_STATS_PAD
) ||
798 nla_put_u64_64bit(skb
, L2TP_ATTR_RX_BYTES
,
799 atomic_long_read(&session
->stats
.rx_bytes
),
800 L2TP_ATTR_STATS_PAD
) ||
801 nla_put_u64_64bit(skb
, L2TP_ATTR_RX_SEQ_DISCARDS
,
802 atomic_long_read(&session
->stats
.rx_seq_discards
),
803 L2TP_ATTR_STATS_PAD
) ||
804 nla_put_u64_64bit(skb
, L2TP_ATTR_RX_OOS_PACKETS
,
805 atomic_long_read(&session
->stats
.rx_oos_packets
),
806 L2TP_ATTR_STATS_PAD
) ||
807 nla_put_u64_64bit(skb
, L2TP_ATTR_RX_ERRORS
,
808 atomic_long_read(&session
->stats
.rx_errors
),
809 L2TP_ATTR_STATS_PAD
))
810 goto nla_put_failure
;
811 nla_nest_end(skb
, nest
);
813 genlmsg_end(skb
, hdr
);
817 genlmsg_cancel(skb
, hdr
);
821 static int l2tp_nl_cmd_session_get(struct sk_buff
*skb
, struct genl_info
*info
)
823 struct l2tp_session
*session
;
827 session
= l2tp_nl_session_get(info
);
828 if (session
== NULL
) {
833 msg
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_KERNEL
);
839 ret
= l2tp_nl_session_send(msg
, info
->snd_portid
, info
->snd_seq
,
840 0, session
, L2TP_CMD_SESSION_GET
);
844 ret
= genlmsg_unicast(genl_info_net(info
), msg
, info
->snd_portid
);
846 l2tp_session_dec_refcount(session
);
853 l2tp_session_dec_refcount(session
);
858 static int l2tp_nl_cmd_session_dump(struct sk_buff
*skb
, struct netlink_callback
*cb
)
860 struct net
*net
= sock_net(skb
->sk
);
861 struct l2tp_session
*session
;
862 struct l2tp_tunnel
*tunnel
= NULL
;
863 int ti
= cb
->args
[0];
864 int si
= cb
->args
[1];
867 if (tunnel
== NULL
) {
868 tunnel
= l2tp_tunnel_find_nth(net
, ti
);
873 session
= l2tp_session_get_nth(tunnel
, si
);
874 if (session
== NULL
) {
881 if (l2tp_nl_session_send(skb
, NETLINK_CB(cb
->skb
).portid
,
882 cb
->nlh
->nlmsg_seq
, NLM_F_MULTI
,
883 session
, L2TP_CMD_SESSION_GET
) < 0) {
884 l2tp_session_dec_refcount(session
);
887 l2tp_session_dec_refcount(session
);
899 static const struct nla_policy l2tp_nl_policy
[L2TP_ATTR_MAX
+ 1] = {
900 [L2TP_ATTR_NONE
] = { .type
= NLA_UNSPEC
, },
901 [L2TP_ATTR_PW_TYPE
] = { .type
= NLA_U16
, },
902 [L2TP_ATTR_ENCAP_TYPE
] = { .type
= NLA_U16
, },
903 [L2TP_ATTR_OFFSET
] = { .type
= NLA_U16
, },
904 [L2TP_ATTR_DATA_SEQ
] = { .type
= NLA_U8
, },
905 [L2TP_ATTR_L2SPEC_TYPE
] = { .type
= NLA_U8
, },
906 [L2TP_ATTR_L2SPEC_LEN
] = { .type
= NLA_U8
, },
907 [L2TP_ATTR_PROTO_VERSION
] = { .type
= NLA_U8
, },
908 [L2TP_ATTR_CONN_ID
] = { .type
= NLA_U32
, },
909 [L2TP_ATTR_PEER_CONN_ID
] = { .type
= NLA_U32
, },
910 [L2TP_ATTR_SESSION_ID
] = { .type
= NLA_U32
, },
911 [L2TP_ATTR_PEER_SESSION_ID
] = { .type
= NLA_U32
, },
912 [L2TP_ATTR_UDP_CSUM
] = { .type
= NLA_U8
, },
913 [L2TP_ATTR_VLAN_ID
] = { .type
= NLA_U16
, },
914 [L2TP_ATTR_DEBUG
] = { .type
= NLA_U32
, },
915 [L2TP_ATTR_RECV_SEQ
] = { .type
= NLA_U8
, },
916 [L2TP_ATTR_SEND_SEQ
] = { .type
= NLA_U8
, },
917 [L2TP_ATTR_LNS_MODE
] = { .type
= NLA_U8
, },
918 [L2TP_ATTR_USING_IPSEC
] = { .type
= NLA_U8
, },
919 [L2TP_ATTR_RECV_TIMEOUT
] = { .type
= NLA_MSECS
, },
920 [L2TP_ATTR_FD
] = { .type
= NLA_U32
, },
921 [L2TP_ATTR_IP_SADDR
] = { .type
= NLA_U32
, },
922 [L2TP_ATTR_IP_DADDR
] = { .type
= NLA_U32
, },
923 [L2TP_ATTR_UDP_SPORT
] = { .type
= NLA_U16
, },
924 [L2TP_ATTR_UDP_DPORT
] = { .type
= NLA_U16
, },
925 [L2TP_ATTR_MTU
] = { .type
= NLA_U16
, },
926 [L2TP_ATTR_MRU
] = { .type
= NLA_U16
, },
927 [L2TP_ATTR_STATS
] = { .type
= NLA_NESTED
, },
928 [L2TP_ATTR_IP6_SADDR
] = {
930 .len
= sizeof(struct in6_addr
),
932 [L2TP_ATTR_IP6_DADDR
] = {
934 .len
= sizeof(struct in6_addr
),
936 [L2TP_ATTR_IFNAME
] = {
937 .type
= NLA_NUL_STRING
,
940 [L2TP_ATTR_COOKIE
] = {
944 [L2TP_ATTR_PEER_COOKIE
] = {
950 static const struct genl_ops l2tp_nl_ops
[] = {
952 .cmd
= L2TP_CMD_NOOP
,
953 .doit
= l2tp_nl_cmd_noop
,
954 .policy
= l2tp_nl_policy
,
955 /* can be retrieved by unprivileged users */
958 .cmd
= L2TP_CMD_TUNNEL_CREATE
,
959 .doit
= l2tp_nl_cmd_tunnel_create
,
960 .policy
= l2tp_nl_policy
,
961 .flags
= GENL_ADMIN_PERM
,
964 .cmd
= L2TP_CMD_TUNNEL_DELETE
,
965 .doit
= l2tp_nl_cmd_tunnel_delete
,
966 .policy
= l2tp_nl_policy
,
967 .flags
= GENL_ADMIN_PERM
,
970 .cmd
= L2TP_CMD_TUNNEL_MODIFY
,
971 .doit
= l2tp_nl_cmd_tunnel_modify
,
972 .policy
= l2tp_nl_policy
,
973 .flags
= GENL_ADMIN_PERM
,
976 .cmd
= L2TP_CMD_TUNNEL_GET
,
977 .doit
= l2tp_nl_cmd_tunnel_get
,
978 .dumpit
= l2tp_nl_cmd_tunnel_dump
,
979 .policy
= l2tp_nl_policy
,
980 .flags
= GENL_ADMIN_PERM
,
983 .cmd
= L2TP_CMD_SESSION_CREATE
,
984 .doit
= l2tp_nl_cmd_session_create
,
985 .policy
= l2tp_nl_policy
,
986 .flags
= GENL_ADMIN_PERM
,
989 .cmd
= L2TP_CMD_SESSION_DELETE
,
990 .doit
= l2tp_nl_cmd_session_delete
,
991 .policy
= l2tp_nl_policy
,
992 .flags
= GENL_ADMIN_PERM
,
995 .cmd
= L2TP_CMD_SESSION_MODIFY
,
996 .doit
= l2tp_nl_cmd_session_modify
,
997 .policy
= l2tp_nl_policy
,
998 .flags
= GENL_ADMIN_PERM
,
1001 .cmd
= L2TP_CMD_SESSION_GET
,
1002 .doit
= l2tp_nl_cmd_session_get
,
1003 .dumpit
= l2tp_nl_cmd_session_dump
,
1004 .policy
= l2tp_nl_policy
,
1005 .flags
= GENL_ADMIN_PERM
,
1009 static struct genl_family l2tp_nl_family __ro_after_init
= {
1010 .name
= L2TP_GENL_NAME
,
1011 .version
= L2TP_GENL_VERSION
,
1013 .maxattr
= L2TP_ATTR_MAX
,
1015 .module
= THIS_MODULE
,
1017 .n_ops
= ARRAY_SIZE(l2tp_nl_ops
),
1018 .mcgrps
= l2tp_multicast_group
,
1019 .n_mcgrps
= ARRAY_SIZE(l2tp_multicast_group
),
1022 int l2tp_nl_register_ops(enum l2tp_pwtype pw_type
, const struct l2tp_nl_cmd_ops
*ops
)
1027 if (pw_type
>= __L2TP_PWTYPE_MAX
)
1032 if (l2tp_nl_cmd_ops
[pw_type
])
1035 l2tp_nl_cmd_ops
[pw_type
] = ops
;
1043 EXPORT_SYMBOL_GPL(l2tp_nl_register_ops
);
1045 void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type
)
1047 if (pw_type
< __L2TP_PWTYPE_MAX
) {
1049 l2tp_nl_cmd_ops
[pw_type
] = NULL
;
1053 EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops
);
1055 static int __init
l2tp_nl_init(void)
1057 pr_info("L2TP netlink interface\n");
1058 return genl_register_family(&l2tp_nl_family
);
1061 static void l2tp_nl_cleanup(void)
1063 genl_unregister_family(&l2tp_nl_family
);
1066 module_init(l2tp_nl_init
);
1067 module_exit(l2tp_nl_cleanup
);
1069 MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
1070 MODULE_DESCRIPTION("L2TP netlink");
1071 MODULE_LICENSE("GPL");
1072 MODULE_VERSION("1.0");
1073 MODULE_ALIAS_GENL_FAMILY("l2tp");