SGSN: encrypt/decrypt only necessary frames

According to 3GPP TS 24.008 ยง 4.7.1.2 some GMM frames are not supposed
to be ciphered. Propagate information about the necessity for
encryption between MM <-> LLC to ensure only proper frames are
encrypted/decrypted/dropped.

Change-Id: I0358905e60d1b182f75caec81bfcc72bbbbb2aa1
Related: OS#1582
6 files changed
tree: f263bc4328886718615139809af9d13ac4b39a1b
  1. contrib/
  2. debian/
  3. openbsc/
  4. .gitignore
  5. .gitreview