From: Marius Tomaschewski Date: Mon, 31 Aug 2015 13:59:22 +0000 (+0200) Subject: ipv6: send NEWLINK on RA managed/otherconf changes X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=a394eef562d781f37a50d99cf1dfe596dc1ed96d;p=deliverable%2Flinux.git ipv6: send NEWLINK on RA managed/otherconf changes The kernel is applying the RA managed/otherconf flags silently and forgets to send ifinfo notify to inform about their change when the router provides a zero reachable_time and retrans_timer as dnsmasq and many routers send it, which just means unspecified by this router and the host should continue using whatever value it is already using. Userspace may monitor the ifinfo notifications to activate dhcpv6. Signed-off-by: Marius Tomaschewski Signed-off-by: David S. Miller --- diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c index 13d3c2beb93e..12fff091e043 100644 --- a/net/ipv6/ndisc.c +++ b/net/ipv6/ndisc.c @@ -1078,6 +1078,7 @@ static void ndisc_router_discovery(struct sk_buff *skb) struct ndisc_options ndopts; int optlen; unsigned int pref = 0; + __u32 old_if_flags; __u8 *opt = (__u8 *)(ra_msg + 1); @@ -1148,6 +1149,7 @@ static void ndisc_router_discovery(struct sk_buff *skb) * Remember the managed/otherconf flags from most recently * received RA message (RFC 2462) -- yoshfuji */ + old_if_flags = in6_dev->if_flags; in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | IF_RA_OTHERCONF)) | (ra_msg->icmph.icmp6_addrconf_managed ? @@ -1155,6 +1157,9 @@ static void ndisc_router_discovery(struct sk_buff *skb) (ra_msg->icmph.icmp6_addrconf_other ? IF_RA_OTHERCONF : 0); + if (old_if_flags != in6_dev->if_flags) + inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); + if (!in6_dev->cnf.accept_ra_defrtr) { ND_PRINTK(2, info, "RA: %s, defrtr is false for dev: %s\n",