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Date: Wed, 30 Jul 2014 02:55:43 +0200 From: David Lamparter <equinox@...c24.net> To: "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org Cc: David Lamparter <equinox@...c24.net>, Stephen Hemminger <stephen@...workplumber.org> Subject: [PATCH net-next] ipv6: addrconf: fix mcast route for GRE devices GRE devices, for some reason, were coming up with an autoconfigured address, but no ff00::/8 route in the local table. This breaks any kind of multicast, in particular OSPFv3, mDNS, - and ND. In fact, IPv6 only works at all because there is little need for ND on PtP devices. Adding any other IPv6 address on the device would rectify this issue through inet6_addr_add()/addrconf_add_dev() - and would leave the route around even if the address was later removed. (This is probably why this issue was not discovered earlier. AFAICS it has been there from the beginning, e.g. aee80b5 "generate link local address for GRE tunnel") (Note: multicast is supported on GRE devices of all kinds, including PtP GRE, P-t-Mcast GRE and NBMA-GRE.) Fixes: aee80b54b235 (ipv6: generate link local address for GRE tunnel) Signed-off-by: David Lamparter <equinox@...c24.net> Cc: Stephen Hemminger <stephen@...workplumber.org> --- net/ipv6/addrconf.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 0b239fc..655a0df 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -2824,6 +2824,7 @@ static void addrconf_gre_config(struct net_device *dev) } addrconf_addr_gen(idev, true); + addrconf_add_mroute(dev); } #endif -- 1.8.5.5 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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