gbproxy: Support a secondary SGSN

This patch refactors SGSN NSEI handling to support a secondary SGSN.

It adds the following VTY commands:
  - secondary-sgsn nsei <0-65534>
  - no secondary-sgsn

Sending messages to the secondary SGSN is not yet implemented, but
received messages from such a SGSN would be forwarded to the BSS
peers.

Sponsored-by: On-Waves ehf
3 files changed
tree: 0e5ec54087680c1d7b707602aecf206dbdc822fe
  1. debian/
  2. hlrsync/
  3. linux-kernel/
  4. openbsc/
  5. wireshark/
  6. README