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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 <mt@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marius Tomaschewski 2015-08-31 15:59:22 +02:00 committed by David S. Miller
parent 684511ac2e
commit a394eef562
1 changed files with 5 additions and 0 deletions
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5
net/ipv6/ndisc.c
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@ -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",