Rework path migration #1859
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Rework path migration #1859
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Reworking the multipath implementation. The core of the update is to replace the flat structure
picoquic_path_tby a two level structure: onpicoquic_path_tper "unique path identifier", and a series ofpicoquic_tuple_tper address/port pairs tested on that path. This follows the discussion in issue #1854. The "RFC 9000 without multipath" handling of paths becomes a subset of the "multipath" mode, with just one path and potentially many tuples.With this change, we can now support the "preferred address" migration according to spec -- previous versions insisted on creating an extra path instead of migrating the path 0.
The new code is shorter, and (a bit) less complex. We could make it shorter still because know we have strict 1-1 relation between
picoquic_path_tstructures and number spaces, and also between these structures and lists of connection identifiers. But that should be the work of another PR.Close #1854.