feat(endpoint): add DirectAddrFilter to drop direct address candidates#4397
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ifdario wants to merge 1 commit into
Open
feat(endpoint): add DirectAddrFilter to drop direct address candidates#4397ifdario wants to merge 1 commit into
ifdario wants to merge 1 commit into
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Add `Builder::direct_addr_filter`, taking a `DirectAddrFilter` trait object (`Arc<dyn>`, mirroring `PathSelector`), consulted in the magicsock's `update_direct_addresses` before the direct addresses are stored. A rejected address is never stored, published via Address Lookup, or offered as a holepunch / NAT-traversal candidate. This lets an application exclude the address of a virtual interface (e.g. a VPN overlay bound on a TUN device) from the candidate set while still binding to the unspecified address for normal multi-homing. `addr_filter` only filters published data; this filters the underlying candidate set, so it also covers in-band NAT-traversal.
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Contributor
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For the random observer: this is linked to #4399 and we need to decide which approach is best. |
Author
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I think they fill different needs |
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Description
Adds
Builder::direct_addr_filterto drop addresses from the endpoint's directaddress candidates. A dropped address is not stored, published, or used for
holepunching / NAT-traversal.
This lets an app exclude a virtual interface's address (e.g. a VPN overlay on a
TUN device) that would otherwise be advertised and dialed by peers, looping the
underlay back into the tunnel.
addr_filteronly covers published data; this runson the candidate set before
store_direct_addresses, so it also covers in-bandNAT-traversal.
DirectAddrFiltertrait (keeps(&self, ip) -> bool), modelled onPathSelector.Builder::direct_addr_filter, stored onOptions/Socket, applied inupdate_direct_addresses.Breaking Changes
None. Optional, defaults to off.
Notes & open questions
Applied at the final gate so it covers all sources (local, QAD, portmap, config).
Could be scoped to local-interface addresses instead if preferred.
Change checklist
proposed change and wrote an as clear and concise description as
they could.
intented effect.