Change in osmo-pcu[master]: paging: pass struct osmo_mobile_identity, not encoded IE bytes

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neels gerrit-no-reply at lists.osmocom.org
Fri Aug 21 14:43:26 UTC 2020


neels has uploaded a new patch set (#2). ( https://gerrit.osmocom.org/c/osmo-pcu/+/19768 )

Change subject: paging: pass struct osmo_mobile_identity, not encoded IE bytes
......................................................................

paging: pass struct osmo_mobile_identity, not encoded IE bytes

In get_paging_mi(), before this, an encoded buffer of Mobile Identity bytes is
returned. Code paths following this repeatedly decode the Mobile Identity
bytes, e.g. for logging. Also, in get_paging_mi(), since the TMSI is read in
from a different encoding than a typical Mobile Identity IE, the TMSI was
manually encoded into a typical Mobile Identity IE. This is essentially a code
dup of osmo_mobile_identity_encode(). Stop this madness.

Instead, in get_paging_mi(), return a decoded struct osmo_mobile_identity. Code
paths after this use the struct osmo_mobile_identity directly without repeated
decoding.

At the point of finally needing an encoded Mobile Identity IE (in
Encoding::write_paging_request()), do a proper osmo_mobile_identity_encode().

Since this may return errors, add an rc check for the caller of
write_paging_request(), gprs_rlcmac_paging_request().

A side effect is stricter validation of the Mobile Identity passing through the
Paging code path. Before, invalid MI might have passed through unnoticed.

Change-Id: Iad845acb0096b75dc453105c9c16b2252879b4ca
---
M src/bts.cpp
M src/bts.h
M src/encoding.cpp
M src/encoding.h
M src/gprs_bssgp_pcu.cpp
M src/gprs_rlcmac.cpp
M src/gprs_rlcmac.h
M src/pcu_l1_if.cpp
M src/pdch.cpp
M src/pdch.h
10 files changed, 51 insertions(+), 40 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-pcu refs/changes/68/19768/2
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Gerrit-Project: osmo-pcu
Gerrit-Branch: master
Gerrit-Change-Id: Iad845acb0096b75dc453105c9c16b2252879b4ca
Gerrit-Change-Number: 19768
Gerrit-PatchSet: 2
Gerrit-Owner: neels <nhofmeyr at sysmocom.de>
Gerrit-CC: Jenkins Builder
Gerrit-MessageType: newpatchset
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