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authorSabrina Dubroca <sd@queasysnail.net>2014-09-10 23:23:02 +0200
committerDavid S. Miller <davem@davemloft.net>2014-09-12 17:33:06 -0400
commit381f4dca48d23e155b936b86ccd3ff12f073cf0f (patch)
treeb6f2de835f42420ad2d374c8ec91da74de2ba988
parentdcbc0054d783d53cf0479c391334e9a478daa25f (diff)
ipv6: clean up anycast when an interface is destroyed
If we try to rmmod the driver for an interface while sockets with setsockopt(JOIN_ANYCAST) are alive, some refcounts aren't cleaned up and we get stuck on: unregister_netdevice: waiting for ens3 to become free. Usage count = 1 If we LEAVE_ANYCAST/close everything before rmmod'ing, there is no problem. We need to perform a cleanup similar to the one for multicast in addrconf_ifdown(how == 1). Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/net/addrconf.h1
-rw-r--r--net/ipv6/addrconf.c8
-rw-r--r--net/ipv6/anycast.c21
3 files changed, 27 insertions, 3 deletions
diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index f679877bb601..ec51e673b4b6 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -204,6 +204,7 @@ void ipv6_sock_ac_close(struct sock *sk);
int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr);
int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
+void ipv6_ac_destroy_dev(struct inet6_dev *idev);
bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
const struct in6_addr *addr);
bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index fc1fac2a0528..3342ee64f2e3 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3094,11 +3094,13 @@ static int addrconf_ifdown(struct net_device *dev, int how)
write_unlock_bh(&idev->lock);
- /* Step 5: Discard multicast list */
- if (how)
+ /* Step 5: Discard anycast and multicast list */
+ if (how) {
+ ipv6_ac_destroy_dev(idev);
ipv6_mc_destroy_dev(idev);
- else
+ } else {
ipv6_mc_down(idev);
+ }
idev->tstamp = jiffies;
diff --git a/net/ipv6/anycast.c b/net/ipv6/anycast.c
index ff2de7d9d8e6..9a386842fd62 100644
--- a/net/ipv6/anycast.c
+++ b/net/ipv6/anycast.c
@@ -351,6 +351,27 @@ static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr)
return __ipv6_dev_ac_dec(idev, addr);
}
+void ipv6_ac_destroy_dev(struct inet6_dev *idev)
+{
+ struct ifacaddr6 *aca;
+
+ write_lock_bh(&idev->lock);
+ while ((aca = idev->ac_list) != NULL) {
+ idev->ac_list = aca->aca_next;
+ write_unlock_bh(&idev->lock);
+
+ addrconf_leave_solict(idev, &aca->aca_addr);
+
+ dst_hold(&aca->aca_rt->dst);
+ ip6_del_rt(aca->aca_rt);
+
+ aca_put(aca);
+
+ write_lock_bh(&idev->lock);
+ }
+ write_unlock_bh(&idev->lock);
+}
+
/*
* check if the interface has this anycast address
* called with rcu_read_lock()