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| author | Hangbin Liu <liuhangbin@gmail.com> | 2019-08-20 10:19:47 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-08-21 20:39:29 -0700 |
| commit | f17f7648a49aa6728649ddf79bdbcac4f1970ce4 (patch) | |
| tree | 9629430e376efeacf222740a81070d27037e80bf | |
| parent | 738a2e4b1774fe0d20d6c027a7cbafb6a1619675 (diff) | |
| download | linux-stable-f17f7648a49aa6728649ddf79bdbcac4f1970ce4.tar.gz linux-stable-f17f7648a49aa6728649ddf79bdbcac4f1970ce4.tar.bz2 linux-stable-f17f7648a49aa6728649ddf79bdbcac4f1970ce4.zip | |
ipv6/addrconf: allow adding multicast addr if IFA_F_MCAUTOJOIN is set
In commit 93a714d6b53d ("multicast: Extend ip address command to enable
multicast group join/leave on") we added a new flag IFA_F_MCAUTOJOIN
to make user able to add multicast address on ethernet interface.
This works for IPv4, but not for IPv6. See the inet6_addr_add code.
static int inet6_addr_add()
{
...
if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
ipv6_mc_config(net->ipv6.mc_autojoin_sk, true...)
}
ifp = ipv6_add_addr(idev, cfg, true, extack); <- always fail with maddr
if (!IS_ERR(ifp)) {
...
} else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
ipv6_mc_config(net->ipv6.mc_autojoin_sk, false...)
}
}
But in ipv6_add_addr() it will check the address type and reject multicast
address directly. So this feature is never worked for IPv6.
We should not remove the multicast address check totally in ipv6_add_addr(),
but could accept multicast address only when IFA_F_MCAUTOJOIN flag supplied.
v2: update commit description
Fixes: 93a714d6b53d ("multicast: Extend ip address command to enable multicast group join/leave on")
Reported-by: Jianlin Shi <jishi@redhat.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv6/addrconf.c | 3 |
1 files changed, 2 insertions, 1 deletions
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)) |