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authorChristian Poessinger <christian@poessinger.com>2021-06-28 22:58:24 +0200
committerChristian Poessinger <christian@poessinger.com>2021-06-28 22:58:24 +0200
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ipsec: T1441: switch from vti to xfrm interfaces
XFRM interfaces are similar to VTI devices in their basic functionality but offer several advantages: * No tunnel endpoint addresses have to be configured on the interfaces. Compared to VTIs, which are layer 3 tunnel devices with mandatory endpoints, this resolves issues with wildcard addresses (only one VTI with wildcard endpoints is supported), avoids a 1:1 mapping between SAs and interfaces, and easily allows SAs with multiple peers to share the same interface. * Because there are no endpoint addresses, IPv4 and IPv6 SAs are supported on the same interface (VTI devices only support one address family). * IPsec modes other than tunnel are supported (VTI devices only support tunnel mode). * No awkward configuration via GRE keys and XFRM marks. Instead, a new identifier (XFRM interface ID) links policies and SAs with XFRM interfaces.
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