Commit 99cd07a5 authored by Juha-Matti Tapio's avatar Juha-Matti Tapio Committed by David S. Miller
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[IPV6]: Fix source address selection for ORCHID addresses

Skip the prefix length matching in source address selection for
orchid -> non-orchid addresses.

Overlay Routable Cryptographic Hash IDentifiers (RFC 4843,
2001:10::/28) are currenty not globally reachable. Without this
check a host with an ORCHID address can end up preferring those over
regular addresses when talking to other regular hosts in the 2001::/16
range thus breaking non-orchid connections.
Signed-off-by: default avatarJuha-Matti Tapio <>
Signed-off-by: default avatarDavid S. Miller <>
parent 5fe47b8a
......@@ -383,6 +383,16 @@ static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
a->s6_addr32[2] == htonl(0x0000ffff));
* Check for a RFC 4843 ORCHID address
* (Overlay Routable Cryptographic Hash Identifiers)
static inline int ipv6_addr_orchid(const struct in6_addr *a)
return ((a->s6_addr32[0] & htonl(0xfffffff0))
== htonl(0x20010010));
* find the first different bit between two addresses
* length of address must be a multiple of 32bits
......@@ -1125,6 +1125,11 @@ int ipv6_dev_get_saddr(struct net_device *daddr_dev,
if (hiscore.rule < 7)
/* Skip rule 8 for orchid -> non-orchid address pairs. */
if (ipv6_addr_orchid(&ifa->addr) && !ipv6_addr_orchid(daddr))
/* Rule 8: Use longest matching prefix */
if (hiscore.rule < 8) {
hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
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