From 7fd2561e4ebdd070ebba6d3326c4c5b13942323f Mon Sep 17 00:00:00 2001 From: Erik Kline Date: Tue, 28 Oct 2014 18:11:14 +0900 Subject: net: ipv6: Add a sysctl to make optimistic addresses useful candidates Add a sysctl that causes an interface's optimistic addresses to be considered equivalent to other non-deprecated addresses for source address selection purposes. Preferred addresses will still take precedence over optimistic addresses, subject to other ranking in the source address selection algorithm. This is useful where different interfaces are connected to different networks from different ISPs (e.g., a cell network and a home wifi network). The current behaviour complies with RFC 3484/6724, and it makes sense if the host has only one interface, or has multiple interfaces on the same network (same or cooperating administrative domain(s), but not in the multiple distinct networks case. For example, if a mobile device has an IPv6 address on an LTE network and then connects to IPv6-enabled wifi, while the wifi IPv6 address is undergoing DAD, IPv6 connections will try use the wifi default route with the LTE IPv6 address, and will get stuck until they time out. Also, because optimistic nodes can receive frames, issue an RTM_NEWADDR as soon as DAD starts (with the IFA_F_OPTIMSTIC flag appropriately set). A second RTM_NEWADDR is sent if DAD completes (the address flags have changed), otherwise an RTM_DELADDR is sent. Also: add an entry in ip-sysctl.txt for optimistic_dad. Signed-off-by: Erik Kline Acked-by: Lorenzo Colitti Acked-by: Hannes Frederic Sowa Signed-off-by: David S. Miller --- include/linux/ipv6.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux/ipv6.h') diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h index ff560537dd61..7121a2e97ce2 100644 --- a/include/linux/ipv6.h +++ b/include/linux/ipv6.h @@ -42,6 +42,7 @@ struct ipv6_devconf { __s32 accept_ra_from_local; #ifdef CONFIG_IPV6_OPTIMISTIC_DAD __s32 optimistic_dad; + __s32 use_optimistic; #endif #ifdef CONFIG_IPV6_MROUTE __s32 mc_forwarding; -- cgit v1.2.3-55-g7522