[lwip-devel] [task #14314] Implement interface name/index APIs

[Dirk Ziegelmeier]

Follow-up Comment #2, task #14314 (project lwip):

/* Interface indexes always start at 1 per RFC 3493, section 4, num starts at
0 */
#define netif_num_to_index(netif)   ((netif)->num + 1)
#define netif_index_to_num(index)   ((index) - 1)

Converting netif->num to index unfortunately is not that easy, because netifs
can be added and removed at runtime. netif->num increases and may wrap around,
and may therefore not even be unique. This needs to be fixed first.

I frequently forget that they may be added/removed at runtime, e.g. in the
IPv6 scopes discussion, because I use lwIP in systems where the netifs are
created only once during startup.


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