netdev - [PATCH net] ipv6/addrconf: allow adding multicast addr if IFA_F

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Date:   Tue, 13 Aug 2019 21:52:32 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     netdev@...r.kernel.org
Cc:     Madhu Challa <challa@...ronetworks.com>,
        David Ahern <dsahern@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jianlin Shi <jishi@...hat.com>,
        Hangbin Liu <liuhangbin@...il.com>
Subject: [PATCH net] ipv6/addrconf: allow adding multicast addr if IFA_F_MCAUTOJOIN is set

The ip address autojoin is not working for IPv6 as ipv6_add_addr()
will return -EADDRNOTAVAIL when adding a multicast address.

Reported-by: Jianlin Shi <jishi@...hat.com>
Fixes: 93a714d6b53d ("multicast: Extend ip address command to enable multicast group join/leave on")
Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
---
 net/ipv6/addrconf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index dc73888c7859..ced995f3fec4 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1045,7 +1045,8 @@ ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
 	int err = 0;
 
 	if (addr_type == IPV6_ADDR_ANY ||
-	    addr_type & IPV6_ADDR_MULTICAST ||
+	    (addr_type & IPV6_ADDR_MULTICAST &&
+	     !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
 	    (!(idev->dev->flags & IFF_LOOPBACK) &&
 	     !netif_is_l3_master(idev->dev) &&
 	     addr_type & IPV6_ADDR_LOOPBACK))
-- 
2.19.2