Commit | Line | Data |
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ec8f24b7 | 1 | # SPDX-License-Identifier: GPL-2.0-only |
fd558d18 JC |
2 | # |
3 | # Layer Two Tunneling Protocol (L2TP) | |
4 | # | |
5 | ||
6 | menuconfig L2TP | |
7 | tristate "Layer Two Tunneling Protocol (L2TP)" | |
fc181625 | 8 | depends on (IPV6 || IPV6=n) |
fd558d18 | 9 | depends on INET |
85644b4d | 10 | select NET_UDP_TUNNEL |
a7f7f624 | 11 | help |
fd558d18 JC |
12 | Layer Two Tunneling Protocol |
13 | ||
14 | From RFC 2661 <http://www.ietf.org/rfc/rfc2661.txt>. | |
15 | ||
16 | L2TP facilitates the tunneling of packets across an | |
17 | intervening network in a way that is as transparent as | |
18 | possible to both end-users and applications. | |
19 | ||
20 | L2TP is often used to tunnel PPP traffic over IP | |
21 | tunnels. One IP tunnel may carry thousands of individual PPP | |
22 | connections. L2TP is also used as a VPN protocol, popular | |
23 | with home workers to connect to their offices. | |
24 | ||
f7faffa3 JC |
25 | L2TPv3 allows other protocols as well as PPP to be carried |
26 | over L2TP tunnels. L2TPv3 is defined in RFC 3931 | |
27 | <http://www.ietf.org/rfc/rfc3931.txt>. | |
28 | ||
fd558d18 JC |
29 | The kernel component handles only L2TP data packets: a |
30 | userland daemon handles L2TP the control protocol (tunnel | |
31 | and session setup). One such daemon is OpenL2TP | |
32 | (http://openl2tp.org/). | |
33 | ||
34 | If you don't need L2TP, say N. To compile all L2TP code as | |
35 | modules, choose M here. | |
f7faffa3 | 36 | |
0ad66140 JC |
37 | config L2TP_DEBUGFS |
38 | tristate "L2TP debugfs support" | |
39 | depends on L2TP && DEBUG_FS | |
40 | help | |
41 | Support for l2tp directory in debugfs filesystem. This may be | |
42 | used to dump internal state of the l2tp drivers for problem | |
43 | analysis. | |
44 | ||
45 | If unsure, say 'Y'. | |
46 | ||
47 | To compile this driver as a module, choose M here. The module | |
48 | will be called l2tp_debugfs. | |
49 | ||
f7faffa3 | 50 | config L2TP_V3 |
41694365 KC |
51 | bool "L2TPv3 support" |
52 | depends on L2TP | |
f7faffa3 JC |
53 | help |
54 | Layer Two Tunneling Protocol Version 3 | |
55 | ||
56 | From RFC 3931 <http://www.ietf.org/rfc/rfc3931.txt>. | |
57 | ||
58 | The Layer Two Tunneling Protocol (L2TP) provides a dynamic | |
59 | mechanism for tunneling Layer 2 (L2) "circuits" across a | |
60 | packet-oriented data network (e.g., over IP). L2TP, as | |
61 | originally defined in RFC 2661, is a standard method for | |
62 | tunneling Point-to-Point Protocol (PPP) [RFC1661] sessions. | |
63 | L2TP has since been adopted for tunneling a number of other | |
64 | L2 protocols, including ATM, Frame Relay, HDLC and even raw | |
65 | ethernet frames. | |
66 | ||
67 | If you are connecting to L2TPv3 equipment, or you want to | |
68 | tunnel raw ethernet frames using L2TP, say Y here. If | |
69 | unsure, say N. | |
0d76751f JC |
70 | |
71 | config L2TP_IP | |
72 | tristate "L2TP IP encapsulation for L2TPv3" | |
73 | depends on L2TP_V3 | |
74 | help | |
75 | Support for L2TP-over-IP socket family. | |
76 | ||
77 | The L2TPv3 protocol defines two possible encapsulations for | |
78 | L2TP frames, namely UDP and plain IP (without UDP). This | |
79 | driver provides a new L2TPIP socket family with which | |
80 | userspace L2TPv3 daemons may create L2TP/IP tunnel sockets | |
81 | when UDP encapsulation is not required. When L2TP is carried | |
82 | in IP packets, it used IP protocol number 115, so this port | |
83 | must be enabled in firewalls. | |
84 | ||
85 | To compile this driver as a module, choose M here. The module | |
86 | will be called l2tp_ip. | |
d9e31d17 JC |
87 | |
88 | config L2TP_ETH | |
89 | tristate "L2TP ethernet pseudowire support for L2TPv3" | |
90 | depends on L2TP_V3 | |
91 | help | |
92 | Support for carrying raw ethernet frames over L2TPv3. | |
93 | ||
94 | From RFC 4719 <http://www.ietf.org/rfc/rfc4719.txt>. | |
95 | ||
96 | The Layer 2 Tunneling Protocol, Version 3 (L2TPv3) can be | |
97 | used as a control protocol and for data encapsulation to set | |
98 | up Pseudowires for transporting layer 2 Packet Data Units | |
99 | across an IP network [RFC3931]. | |
100 | ||
101 | This driver provides an ethernet virtual interface for each | |
102 | L2TP ethernet pseudowire instance. Standard Linux tools may | |
103 | be used to assign an IP address to the local virtual | |
104 | interface, or add the interface to a bridge. | |
105 | ||
106 | If you are using L2TPv3, you will almost certainly want to | |
107 | enable this option. | |
108 | ||
109 | To compile this driver as a module, choose M here. The module | |
110 | will be called l2tp_eth. |