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Author SHA1 Message Date
Harald Welte adfaa57b53 ggsn: Add ability to specify local IP addresses for GTP-C and GTP-U
In case the GGSN is behind some kind of DNAT, the public GTP-C and
GTP-U IP addresses as exposed inside the GTP payload information
elements are different from the (internal, behind-nat) IP address
to which it listens/binds.

Change-Id: I548c9011c9abd66d46f963b1def61575f3dabb89
2017-09-05 22:43:45 +02:00
Harald Welte 017c52378c Rename OpenGGSN to OsmoGGSN
Osmocom has maintained this program since about 7 years now, while
the original author / copyright holder has completely disappeared.

With the introduction of Osmocom-style CTRL and VTY interfaces,
the way how the program is used and configured has substantially
changed.  In order to avoid confusion in terms of configuration file
format etc, let's rename it to OsmoGGSN.

Change-Id: I2da30f7d4828e185bfac1a4e2d8414b01cbe4f9d
2017-09-05 22:43:44 +02:00
Harald Welte 11cede413a ggsn: Handle SIGTERM like SIGINT and terminate
Change-Id: I0c8773bd6ef41332b91b5b025aef9ef129af8289
2017-09-05 22:43:03 +02:00
Harald Welte c9f4f37dd4 Introduce a VTY, factually turning OpenGGSN into an Osmocom program
Change-Id: I9613ca3436e77ea132c47f0096df7c5050d7e826
2017-09-05 22:42:18 +02:00
Harald Welte 4857f3c2f3 lib/ippool: Move ippool_aton() out of ippool_new()
we rather pass the in46_prefix directly into ippool_new()

Change-Id: Iadf6274e881a9bfc75eb41f9380f5ae2d8c92a0f
2017-09-05 22:42:18 +02:00
Harald Welte 8ffd7fc782 gtp-kernel: Remove dependency to cmdline.[ch]
Change-Id: I760f25df609c309eba4d5716f3e23b49320449bf
2017-09-05 22:42:17 +02:00
Pau Espin 0ab62fe081 ggsn: Fix DNS not sent in PDP context response
During IPv6 support implementation, helper function pco_contains_proto
was added which contains an error: It is only capable of finding first
protocol correctly, and as a consequence, in my setup DNS servers where not
sent back to the SGSN/MS, resulting in phone being able to connect to
IPs but not to domain names which required DNS resolution.

The condition in the while loop is also changed to match the increment
of the variable inside the loop to make it easier to understand at first
glance.

Fixes: 1ae98777d9

Change-Id: Icc2e6716c33d78d3c3e000f529806228d8aa155e
2017-08-30 15:56:27 +02:00
Harald Welte b10ee08c2f Properly format IMSI before using it in trap
For some reason Max' commits introducing the CTRL/trap interface
about one year ago didn't convert the IMSI to its actual textual
representation before usign it in the CTRL interface.

Let's clean that up by properly interpreting the IMSI.

Change-Id: I8b20d2e47a29de266d93a7ddd5e6877f7e346a63
2017-08-12 22:53:54 +02:00
Harald Welte 2e48a44952 Support setting TUN device IPv6 address + prefix
As we can now have PDP contexts with IPv6 user IP payload,
it is useful to extend the TUN related code to be able to
configure the tun device IPv6 address + prefix length

Change-Id: I899d21e52d02e0b8384af29ddd489ff19c8f2cf6
2017-08-11 13:12:04 +02:00
Harald Welte 1ae98777d9 IPv6: Support PCO for IPv6 DNS addresses
In IPv6, DNS server information is not passed along as IPCP6 like
in IPv5 with IPCP.  The reason is that IPCP6 (for PPP) doesn't
support passing DNS server information.  Rather, the relevant RFCs
indicate DHCPv6 should be used even over point-to-point links.

3GPP decided to avoid DHCPv6 dependency for stateless autoconfiguration
(the only mandatory IPv6 configuration mechanism) and added some new
non-PPP-style PCO information elements ("containers") which can among
other things inform a MS about IPV6 DNS servers.

That same mechanism can also be used to inform the MS about IPv4 DNS
servers, so for IPv4 there are now two competing mechanisms: IPCP and
the new "native" PCO container.  With this patch, we support both
for IPv4.

Change-Id: I21499afd61def8c925f7838bde76f34d28214b56
2017-08-11 10:46:00 +02:00
Harald Welte d46bcd236e IPv6: Implement IPv6 prefix assignment via ICMPv6 router advertisement
The 3GPP specs are quite strange when it comes to how an IPv6 address
or rather prefix is assigned to an IPv6 PDP context.  The designated
method for allocating the IPv6 address via the PDP EUA (End User
Address) Information Element in the GTP signalling plane is *not*
used to allocate the address/prefix.  Instead, the EUA is used to
allocate an "interface identifier" to the MS, which it the uses
to derive its link-local source address to send a router solicitation.

The GGSN subsequently answers witha router advertisement, advertising
a single/64 prefix, whihcthe MS then uses to generate it's real IPv6
source address for subsequent communication.

Change-Id: Icddf7d30e01d76a4784bcef5787b36f52f703a9f
2017-08-11 10:45:56 +02:00
Harald Welte d4d6e09fd2 ippool: Extend pool to work with /64 prefixes
In IPv6 GPRS, we actually don't want to allocate an individual v6
address (like in IPv4), but we want to allocate a prefix.  The
standard prefix lengh is 8 bytes, i.e. a /64 prefix.  This patch
extends the pool to be able to work with such v6 prefixes.

Change-Id: I0cf700b6baf195a2e5fbea000531f801acaaa443
2017-08-09 22:37:57 +02:00
Harald Welte d1bf1e11ba ggsn: Send proper errors in create_context_ind()
When we receive PDP context requests for unknown PDP types or if
we run out of dynamic addresses, we need to inform the SGSN that
PDP context creation failed.

Change-Id: Ibf199c1726130d27c8f80230b30ee51101c93b06
2017-08-09 22:09:34 +02:00
Harald Welte a0d281db1c IPv6 support for user IP
This patch enables the use of IPv6 PDP contexts.  The phone will
have to request an IPv6 End-user-Address, and the GGSN will have
to be configured for an IPv6 pool.

The outer transport-layer IP between SGSN and GGSN must still be
IPv4, it is not modified by this patch

Change-Id: I22c3bf32a98e5daf99d6eaeac8c9f95cc7574774
2017-08-09 22:09:34 +02:00
Harald Welte 63ebccdfe3 lib/tun.h: Remove non-endian-safe redefinition of IP header
We can simply use 'struct iphdr' from netinet/ip.h to achieve
the same goal (and be portable).

Change-Id: Ieece22e127dc14a7ffdc3b05656628989ad00b32
2017-08-09 22:09:34 +02:00
Harald Welte d12eab9c4e ippool: Add IPv6 support to IP pool implementation
Extend the IP pool implementation to be able to manage both pools
of 32bit addresses (IPv4) as well as pools of 128bit addresses (IPv6)

Change-Id: Ib98cc4bf634d6be9a7bf8c03a24e629455fcafc8
2017-08-09 22:08:57 +02:00
Harald Welte d9d8862a58 Proper fix for "Force Dynamic IP" in Create PDP CTX
An EUA length of *2* octets indicates dynamic IP address, while
an EUA length of 0 is invalid.  Let's fix this hack (which needs
to finally be removed anyway).

Change-Id: Ib1b57eb0654327882044d6862d955f4b32aa6bcd
2017-08-04 00:23:57 +02:00
Max 3142d8d30b ctrl: cleanup trap creation
Move common trap create/send code into separate function.

Change-Id: Iaadc921b951aeb9b3ad5ab796e13d52017139468
2017-05-16 17:10:25 +02:00
Max dbd7024919 Only send TRAP for defined PDP peer
Do not attempt to send TRAP message on PDP context deletion if peer is
unknown.

Change-Id: I5e02c1d42bb7aaf1ef81a9824aab7b12047cdd3e
Fixes: Coverity CID 150135
2016-11-02 09:32:31 +00:00
Max 727417dd28 Add control interface
Only generation of TRAP messages over Control Interface is supported so
far.

Note: requires corresponding version of libosmoctrl.

Change-Id: Ia76f841d2c9cd14394e9316fcd39f4060e23c898
Related: OS#1646
2016-10-12 09:30:30 +00:00
Max 395e213894 Remove unused function
Change-Id: Iff0f1499660b12a47277b16a435efecb42fab038
2016-10-11 15:31:49 +02:00
Pablo Neira Ayuso d9d7be339d ggsn: cmdline: no need to specify interface anymore
--gtpnl is now gone, instead you have --gtpkernel that behaves as an on/off
toggle. We full rely on the kernel routing base to select the real device to
transmit.

I have updated ggsn/cmdline.ggo and then run 'gengetopt' to refresh the
automatic code generation for command line options that openggsn uses.
2016-05-10 19:06:01 +02:00
Andreas Schultz c5fbf9bd68 ggsn: update gpt-kernel logging to libosmocore
Signed-off-by: Andreas Schultz <aschultz@tpip.net>
2015-12-21 08:37:26 +01:00
Pablo Neira Ayuso 4b075b6cb8 ggsn: add support for GTP kernel data encapsulation
This patch adds the -g, --gtpnl=device option that allows you to
enable the GTP kernel tunneling mode in openggsn. You have to specify
the real downlink device that will be used to tunnel traffic, eg.

	-g=eth0

This means that the gtp0 device will be created and it will use eth0
as the real device to encapsulate packet coming from the Internet that
are addressed to the MS (so the tunnel devuce encapsulates these IP
packets in GTP packets when traveling to the SGSN).

Alternatively, you can also add this to the ggsn.conf configuration file:

	gtpnl eth0

The device has to be the real device that can route packets to the SGSN,
if you select the wrong device, the kernel routing code may not find a
way to reach the SSGN, you've been warned.

Therefore, if this option is set, the operational becomes the following:

1) A gtp0 device is created via rtnetlink and configure the socket
   encapsulation infrastructure in the kernel.
2) Whenever a PDP context is created, this adds the necessary tunnel
   configuration via genetlink GTP interface.
3) Whenever a PDP context is destroyed, this deletes the tunnel via
   genetlink GTP interface.
4) Destroy the gtp0 device if ggsn is stopped, including all of the
   existing tunnels.

You require the osmo-ggsn.git tree, which contains the kernel module
gtp.ko and the libgtpnl library that you have to compile and install.
Make sure you have loaded the gtp.ko kernel module before launching
the ggsn daemon using the kernel driver mode, otherwise you will get
a nice "operation not supported" error message ;-).

This patch also adds supports for "ipup" configuration option to invoke
an external script after the gtp0 device has been brought up. Typical
command to add the route to reach the MS behind the GGSN is required,
eg. ip route add 10.0.0.0/8 dev gtp0.

The (horrible) ggsn parser has been manually extended to support the
new configuration option. That code doesn't look nice, but it just
mimics what we already have there for consistency, please don't blame
me for that.

If you want to run in debugging mode, I suggest you to use:

	sudo ggsn -c ggsn.conf -f -d

Note that you do have to run openggsn as root to bring up the gtp0
device. You have to see this message that announce that the GTP kernel
mode is enabled.

openggsn[1106]: ggsn.c: 656: Using the GTP kernel mode (genl ID is 25)

This patch also automagically sets up route to reach MS from Internet
just like tun mode does. This is fundamental to get this working,
better don't leave to the admin, he may forget to add this route.

In this patch, I tried to encapsulate this new feature as much as
possible as Harald initially suggested.

To compile this feature, you have to pass --enable-gtp-kernel, ie.

./configire --enable-gtp-kernel

Otherwise, the code to interact with the gtp kernel part is not compiled.

Signed-off-by: Andreas Schultz <aschultz@tpip.net>
2015-12-21 08:37:11 +01:00
Holger Hans Peter Freyther 6ab58b466a ggsn: Move printf to DEBUGP statements in the ggsn as well
The specific log statements are not great yet but at least they
will end up in the log file. In the future everything should be
related to the IMSI or at least the tunnel id.
2014-12-04 19:29:57 +01:00
Holger Hans Peter Freyther 8e7e3ef686 ggsn: Remove unused dump/logging method 2014-12-04 19:19:33 +01:00
Holger Hans Peter Freyther c38bf64e3f ggsn: Be able to set the log level for the text file
Fixes: SYS#599
2014-12-04 18:54:58 +01:00
Holger Hans Peter Freyther 9c7fd8edc4 logging: Switch to using libosmocore logging for all the code 2014-12-04 16:51:15 +01:00
Holger Hans Peter Freyther 9c0ff4fafe cli: Introduce a logfile command to log errors to a file
The evolution would be to introduce libosmocore and start using
the logging framework. But even then we can map this option to
the file target.

Fixes: SYS#263
2014-03-23 10:29:17 +01:00
Harald Welte bed35df298 Convert all code to Linux coding style
After so many years of silence, we don't expect the original author to
return to the project.  To make things a bit simpler for us, we convert
the coding style to what we are used to (Linux style).

The conversion was made using the 'Lindent' script which is part of the
Linux kernel.
2011-11-02 13:06:18 +01:00
Emmanuel Bretelle 91384a4cb0 Do not exceed 80 characters per line
Signed-off-by: Emmanuel Bretelle <chantra@debuntu.org>
2010-10-20 11:04:51 +02:00
Emmanuel Bretelle 2a103687b6 Move common sgsnemu/ggsn files to directory "lib"
Some files like in sgsnemu and ggsn directory where exactly the same.
They are now moved to the same directory for easier maintenance

Signed-off-by: Emmanuel Bretelle <chantra@debuntu.org>
2010-10-20 11:04:51 +02:00
Emmanuel Bretelle 68521860e0 Fixed compile warning,exit if cant daemonize
Relevant output of make:

ggsn.c: In function ‘main’:
ggsn.c:436: warning: ignoring return value of ‘freopen’, declared with
attribute warn_unused_result
ggsn.c:437: warning: ignoring return value of ‘freopen’, declared with
attribute warn_unused_result
ggsn.c:438: warning: ignoring return value of ‘freopen’, declared with
attribute warn_unused_result
ggsn.c:439: warning: ignoring return value of ‘daemon’, declared with
attribute warn_unused_result

Signed-off-by: Emmanuel Bretelle <chantra@debuntu.org>
2010-10-20 11:04:51 +02:00
Harald Welte 1b3e577017 Use newer gengetopt which also frees memory
Taken from http://sourceforge.net/tracker/index.php?func=detail&aid=1811521&group_id=68956&atid=522957
2010-05-04 11:13:56 +02:00
Harald Welte 5701b0f647 GGSN: free the ippool memory before exit
Taken from http://sourceforge.net/tracker/index.php?func=detail&aid=1811518&group_id=68956&atid=522957
2010-05-04 11:12:23 +02:00
Harald Welte f54a1f4d43 Fix various compiler warnings throughout the code
Mostly signed/unsigned and typecasting issues

Taken from http://sourceforge.net/tracker/index.php?func=detail&aid=1811517&group_id=68956&atid=522957
2010-05-04 11:08:38 +02:00
Harald Welte 5d064ecb84 GGSN: Fix select() error case, we need to FD_ZERO() again
Taken from http://sourceforge.net/tracker/index.php?func=detail&aid=1811515&group_id=68956&atid=522957
2010-05-04 11:04:54 +02:00
Harald Welte c3dcba0fa6 Fix GGSN signal handling
In order te exit gracefully (closing the tun devices), we install a SIGINT
handler and note its occurrence in a global variable.

This fix is from http://sourceforge.net/tracker/index.php?func=detail&aid=1811513&group_id=68956&atid=522957
2010-05-04 11:02:54 +02:00
jjako ada9ffaf9e QA on ippool 2004-12-30 16:39:11 +00:00
jjako bd937b7290 Minor fix 2004-12-30 16:22:42 +00:00
jjako 0fe0df0079 qos length bugfix and apple support plus header cleanup 2004-09-17 11:30:40 +00:00
jjako 12f9e6e263 QoS length bugfiz 2004-09-17 10:28:25 +00:00
jjako c6762cfc27 Solaris tun interface 2004-04-28 14:52:58 +00:00
jjako 1f1586458f Added IP address alias capability for FreeBSD 2004-02-05 20:39:57 +00:00
jjako ff9985cb36 Improved Solaris support 2004-01-16 11:05:22 +00:00
jjako 1d3db978f4 Improved solaris compatibility 2004-01-16 09:56:56 +00:00
jjako 76032b9028 Changet inet_aton to inet_pton for Solaris compliance 2004-01-14 06:22:08 +00:00
jjako 0141d20232 Changes to allow compilation under Solaris 2004-01-09 15:19:20 +00:00
jjako 08d331db63 First attempt at a GTP1 implementation 2003-10-13 20:33:30 +00:00
jjako 1db1c81302 Improved GTP error handling 2003-07-06 20:53:57 +00:00