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Commit 102128e3 authored by Łukasz Stelmach's avatar Łukasz Stelmach Committed by David S. Miller
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[IPV6]: Fix source address selection. 



Two additional labels (RFC 3484, sec. 10.3) for IPv6 addreses
are defined to make a distinction between global unicast
addresses and Unique Local Addresses (fc00::/7, RFC 4193) and
Teredo (2001::/32, RFC 4380). It is necessary to avoid attempts
of connection that would either fail (eg. fec0:: to 2001:feed::)
or be sub-optimal (2001:0:: to 2001:feed::).

Signed-off-by: default avatarŁukasz Stelmach <stlman@poczta.fm>
Signed-off-by: default avatarYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5b057c6b

net/ipv6/addrconf.c

+6 −0
Original line number Diff line number Diff line
@@ -862,6 +862,8 @@ static int inline ipv6_saddr_label(const struct in6_addr *addr, int type) 
  * 	2002::/16		2

  * 	::/96			3

  * 	::ffff:0:0/96		4

  *	fc00::/7		5

  * 	2001::/32		6

  */

	if (type & IPV6_ADDR_LOOPBACK)

		return 0;
@@ -869,8 +871,12 @@ static int inline ipv6_saddr_label(const struct in6_addr *addr, int type) 
		return 3;

	else if (type & IPV6_ADDR_MAPPED)

		return 4;

	else if (addr->s6_addr32[0] == htonl(0x20010000))

		return 6;

	else if (addr->s6_addr16[0] == htons(0x2002))

		return 2;

	else if ((addr->s6_addr[0] & 0xfe) == 0xfc)

		return 5;

	return 1;

}