drivers/net/ppp/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 #
   3 # PPP network device configuration
   4 #
   5
   6 config PPP
   7         tristate "PPP (point-to-point protocol) support"
   8         select SLHC
   9         help
  10           PPP (Point to Point Protocol) is a newer and better SLIP.  It serves
  11           the same purpose: sending Internet traffic over telephone (and other
  12           serial) lines.  Ask your access provider if they support it, because
  13           otherwise you can't use it; most Internet access providers these
  14           days support PPP rather than SLIP.
  15
  16           To use PPP, you need an additional program called pppd as described
  17           in the PPP-HOWTO, available at
  18           <http://www.tldp.org/docs.html#howto>.  Make sure that you have
  19           the version of pppd recommended in <file:Documentation/Changes>.
  20           The PPP option enlarges your kernel by about 16 KB.
  21
  22           There are actually two versions of PPP: the traditional PPP for
  23           asynchronous lines, such as regular analog phone lines, and
  24           synchronous PPP which can be used over digital ISDN lines for
  25           example.  If you want to use PPP over phone lines or other
  26           asynchronous serial lines, you need to say Y (or M) here and also to
  27           the next option, "PPP support for async serial ports".  For PPP over
  28           synchronous lines, you should say Y (or M) here and to "Support
  29           synchronous PPP", below.
  30
  31           If you said Y to "Version information on all symbols" above, then
  32           you cannot compile the PPP driver into the kernel; you can then only
  33           compile it as a module. To compile this driver as a module, choose M
  34           here. The module will be called ppp_generic.
  35
  36 if PPP
  37
  38 config PPP_BSDCOMP
  39         tristate "PPP BSD-Compress compression"
  40         depends on PPP
  41         help
  42           Support for the BSD-Compress compression method for PPP, which uses
  43           the LZW compression method to compress each PPP packet before it is
  44           sent over the wire. The machine at the other end of the PPP link
  45           (usually your ISP) has to support the BSD-Compress compression
  46           method as well for this to be useful. Even if they don't support it,
  47           it is safe to say Y here.
  48
  49           The PPP Deflate compression method ("PPP Deflate compression",
  50           above) is preferable to BSD-Compress, because it compresses better
  51           and is patent-free.
  52
  53           Note that the BSD compression code will always be compiled as a
  54           module; it is called bsd_comp and will show up in the directory
  55           modules once you have said "make modules". If unsure, say N.
  56
  57 config PPP_DEFLATE
  58         tristate "PPP Deflate compression"
  59         depends on PPP
  60         select ZLIB_INFLATE
  61         select ZLIB_DEFLATE
  62         help
  63           Support for the Deflate compression method for PPP, which uses the
  64           Deflate algorithm (the same algorithm that gzip uses) to compress
  65           each PPP packet before it is sent over the wire.  The machine at the
  66           other end of the PPP link (usually your ISP) has to support the
  67           Deflate compression method as well for this to be useful.  Even if
  68           they don't support it, it is safe to say Y here.
  69
  70           To compile this driver as a module, choose M here.
  71
  72 config PPP_FILTER
  73         bool "PPP filtering"
  74         depends on PPP
  75         help
  76           Say Y here if you want to be able to filter the packets passing over
  77           PPP interfaces.  This allows you to control which packets count as
  78           activity (i.e. which packets will reset the idle timer or bring up
  79           a demand-dialed link) and which packets are to be dropped entirely.
  80           You need to say Y here if you wish to use the pass-filter and
  81           active-filter options to pppd.
  82
  83           If unsure, say N.
  84
  85 config PPP_MPPE
  86         tristate "PPP MPPE compression (encryption)"
  87         depends on PPP
  88         select CRYPTO
  89         select CRYPTO_SHA1
  90         select CRYPTO_LIB_ARC4
  91         help
  92           Support for the MPPE Encryption protocol, as employed by the
  93           Microsoft Point-to-Point Tunneling Protocol.
  94
  95           See http://pptpclient.sourceforge.net/ for information on
  96           configuring PPTP clients and servers to utilize this method.
  97
  98 config PPP_MULTILINK
  99         bool "PPP multilink support"
 100         depends on PPP
 101         help
 102           PPP multilink is a protocol (defined in RFC 1990) which allows you
 103           to combine several (logical or physical) lines into one logical PPP
 104           connection, so that you can utilize your full bandwidth.
 105
 106           This has to be supported at the other end as well and you need a
 107           version of the pppd daemon which understands the multilink protocol.
 108
 109           If unsure, say N.
 110
 111 config PPPOATM
 112         tristate "PPP over ATM"
 113         depends on ATM && PPP
 114         help
 115           Support PPP (Point to Point Protocol) encapsulated in ATM frames.
 116           This implementation does not yet comply with section 8 of RFC2364,
 117           which can lead to bad results if the ATM peer loses state and
 118           changes its encapsulation unilaterally.
 119
 120 config PPPOE
 121         tristate "PPP over Ethernet"
 122         depends on PPP
 123         help
 124           Support for PPP over Ethernet.
 125
 126           This driver requires the latest version of pppd from the CVS
 127           repository at cvs.samba.org.  Alternatively, see the
 128           RoaringPenguin package (<http://www.roaringpenguin.com/pppoe>)
 129           which contains instruction on how to use this driver (under
 130           the heading "Kernel mode PPPoE").
 131
 132 config PPTP
 133         tristate "PPP over IPv4 (PPTP)"
 134         depends on PPP && NET_IPGRE_DEMUX
 135         help
 136           Support for PPP over IPv4.(Point-to-Point Tunneling Protocol)
 137
 138           This driver requires pppd plugin to work in client mode or
 139           modified pptpd (poptop) to work in server mode.
 140           See http://accel-pptp.sourceforge.net/ for information how to
 141           utilize this module.
 142
 143 config PPPOL2TP
 144         tristate "PPP over L2TP"
 145         depends on L2TP && PPP
 146         help
 147           Support for PPP-over-L2TP socket family. L2TP is a protocol
 148           used by ISPs and enterprises to tunnel PPP traffic over UDP
 149           tunnels. L2TP is replacing PPTP for VPN uses.
 150 if TTY
 151
 152 config PPP_ASYNC
 153         tristate "PPP support for async serial ports"
 154         depends on PPP
 155         select CRC_CCITT
 156         help
 157           Say Y (or M) here if you want to be able to use PPP over standard
 158           asynchronous serial ports, such as COM1 or COM2 on a PC.  If you use
 159           a modem (not a synchronous or ISDN modem) to contact your ISP, you
 160           need this option.
 161
 162           To compile this driver as a module, choose M here.
 163
 164           If unsure, say Y.
 165
 166 config PPP_SYNC_TTY
 167         tristate "PPP support for sync tty ports"
 168         depends on PPP
 169         help
 170           Say Y (or M) here if you want to be able to use PPP over synchronous
 171           (HDLC) tty devices, such as the SyncLink adapter. These devices
 172           are often used for high-speed leased lines like T1/E1.
 173
 174           To compile this driver as a module, choose M here.
 175
 176 endif # TTY
 177
 178 endif # PPP