This patch is quite big because implementing echo req/resp and recovery
requires having knowledge and managing differentiated state for each GSN
peer attached/connected to osmo-ggsn. This kind of information was not
available in osmo-ggsn nor in libgtp.
So osmo-ggsn is now able to track GSN peers connected to a
ggsn_ctx (associated gsn_t from libgtp) by means of "sgsn_peer" data
structure, and accessible from the ggsn through a list. The instances of
sgsn_peer are currently allocated and destroyed dynamically based on
discovered peer who have at least a pdp context attached to us (we are
not interested in peers without pdp contexts because we don't need to
send echo requests/responses and maintain state in that case).
A new private pointer (pdp_t->priv) data structure struct pdp_priv_t is
added to be able to relate a pdp_t to an sgsn as well as the already
existing pointer to an apn.
An "echo-interval <0-36000>" VTY command is added which allows
configuring time wait between echo requests being sent to each
sgsn_peer. Transmission of echo requests is disabled by default.
Finally, a new "show sgsn" VTY command is introduced, and its output is
also printed during "show ggsn".
Related: OS#4165
Change-Id: Id2c84165dc59dff495106758146a701ca488834f
This way ggsn.c is shrinked in size and get rid of a lot of code there,
which is of no interest unless the reader is interested in that really
specific part.
Change-Id: Ieaa7e71f17c7fd9377c76ef53362eab596d669a6
This vty cmd let's you set up a new link-local IP for a specific APN to
be used during ICMPv6 Router Advertisement procedure.
osmo-ggsn hence requires a link-local IPv6 address to be added to the
tun interface, otherwise the apn will not be configured correctly and it
won't be able to allocate addresses from the ipv6 pool later on.
This feature is useful in case your OS doesn't support autoconfiguring
link-local IPs when the interface is brought up (some linux versions are
known to fail at this) or in case you configured your OS specifically to
avoid automatic set up (sysctl net.ipv6.conf.*.autoconf).
If "no ipv6 link-local" is provided (default), osmo-ggsn will rely on the
OS or the ipup-script setting up the link-local IP for the tun
interface at creation time, then fetching it after ipup-script time and
using the first link-local ip found. On the other hand, if the "ipv6
link-local" cmd is provided, osmo-ggsn will add the link-local IP to the
interface manually and use that one for later Router Advertisement
procedures.
Change-Id: I09ef27f54940d4c47150e5f9016d1cd4298c16b5
This per-APN vty option determines if we are transmitting GTP sequence
numbers in downlink G-PDU messages. This behavior is optional as per
GTP spec. The default behavior is "true", like before this change.
Related: OS#2519
Change-Id: Ibf0de261f83951309b01b4feae998b6656c77664
I'm not quite sure how I ended up doing this, but for some strange
reason the code before this commit is sending the ICMPv6 Router
Advertisements from some weird non-standard source address. This is
a violation of RFC4861 which clearly states that the source address
of router advertisements "MUST be the link-local address assigned to the
interface from which this message is sent."
Change-Id: Ib444af70fc8f0b433d371281601fd5a37b29039e
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
Pau Espin
Harald Welte