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addr: Look at /48 for IPv6 in is_local_addr()

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Closes #33618

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2020-06-25 13:45:05 -04:00
parent 069566b40a
commit 40922629fe
1 changed files with 4 additions and 2 deletions
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6
src/app/config/resolve_addr.c
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@ -603,8 +603,10 @@ is_local_to_resolve_addr, (const tor_addr_t *addr))
return tor_addr_compare_masked(addr, last_resolved_addr, 24,
CMP_SEMANTIC) == 0;
case AF_INET6:
/* Look at the /32 like addrs_in_same_network_family() does. */
return tor_addr_compare_masked(addr, last_resolved_addr, 32,
/* Look at /48 because it is typically the smallest network in the global
* IPv6 routing tables, and it was previously the recommended per-customer
* network block. (See [RFC 6177: IPv6 End Site Address Assignment].) */
return tor_addr_compare_masked(addr, last_resolved_addr, 48,
CMP_SEMANTIC) == 0;
break;
default: