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Felix Fietkau
090afc220f
hostapd, wpa_supplicant and wdev.uc each allocate addresses with the allocator of common.uc, and each sees the addresses of the others only through lists that they pass to each other or through the netdevs that exist at that moment. An address that one of them keeps for an interface without a netdev is free for the others. Add one allocation table to the wireless code of netifd, with four methods on network.wireless: - macaddr_get gives an address to a name of an owner (hostapd, wpa_supplicant or wdev). A name keeps its address while the wiphy, the radio and the generator options stay the same; with any_radio, also when the radio or the options change, as a station MLD needs. A configured (static) address that another name holds is refused. share lets a name use the address of another name of the same owner, as an AP MLD link does with the MLD address. - macaddr_sync sets the names of an owner and group in one call: names that it does not list are released, and an address can move to another name of the group (from), for a renamed or swapped BSS. - macaddr_release releases one name. - macaddr_list shows the table. Addresses are unique per wiphy. Generation skips the addresses of the interfaces in the UCI configuration, and the addresses of netdevs without an entry. The generator is a copy of the one in common.uc, with the per-radio ranges; it reads the wiphy once per request and stops at the first free address. An entry that shares the address of another name holds that address for the shared name only: a request for that name does not count the entry as a holder. Such an entry accounts for no netdev, so the check of the live netdevs still runs. A released entry, and each entry of an owner whose ubus object goes away, stays as a stale entry for the life of netifd, so that the interface or the process that comes back gets its address by name: - A request, or a sync that keeps the name, claims the entry again. - A released entry with a configured address goes instead. The address comes back with the configuration. - A new name gets a stale address only where the range of the request has no other free address. - A stale entry yields to a request that names its address: a configured address, a shared one, or a value of a sync. A request that takes the address removes the stale entries of other names with it. In a sync, the entries of the same owner lose the address; a stale entry of another owner keeps it, and its name finds a holder when it asks again. The table lives in netifd only. A restart of netifd through its init script tears the radios down first, so the new table starts empty. The configured addresses are lower-cased again in update_config(), because hostapd and wpa_supplicant compare them with the addresses that netifd returns. Nothing uses the methods yet. Signed-off-by: Felix Fietkau <nbd@nbd.name>