Andrew Dunham 20f3f706a4 net/netutil: allow 16-bit 4via6 site IDs
The prefix has space for 32-bit site IDs, but the validateViaPrefix
function would previously have disallowed site IDs greater than 255.

Fixes tailscale/corp#16470

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: I4cdb0711dafb577fae72d86c4014cf623fa538ef
2024-01-09 10:30:46 -05:00
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