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net: ip: Introduce mesh_local address flag

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This commit introduces a concept of mesh-local IPv6 addresses. Such
addresses should only be used for mesh-local communication, therefore
should not be used to communicate with different subnets (i. e.
destinations outside the mesh).

As `addr_type` field already holds different kind of information
(whether address was created automatically/manually) it was not used in
this case.

Instead a mesh_local flag was added, so that we do not lose information
on how address was created. Address with such flag set will only be
selected as a source address automatically if the destination address
is within the same subnet it belongs to.

Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>
This commit is contained in:
Robert Lubos 2019-01-24 15:56:10 +01:00 • committed by Anas Nashif
commit 83b8abaf8a
3 changed files with 14 additions and 3 deletions
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5
include/net/net_if.h
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@ -75,7 +75,10 @@ struct net_if_addr {
/** Is this IP address used or not */
u8_t is_used : 1;
u8_t _unused : 6;
/** Is this IP address usage limited to the subnet (mesh) or not */
u8_t is_mesh_local : 1;
u8_t _unused : 5;
};
/**