* [PATCH net-next 1/2] ipv6: addrconf: don't use rtnl mutex in RTM_GETNETCONF
2017-10-11 8:27 [PATCH net-next 0/2] ipv6: addrconf: make two more doit functions not use rtnl mutex Florian Westphal
@ 2017-10-11 8:28 ` Florian Westphal
2017-10-12 3:17 ` David Miller
2017-10-11 8:28 ` [PATCH net-next 2/2] ipv6: addrconf: don't use rtnl mutex in RTM_GETADDR Florian Westphal
1 sibling, 1 reply; 5+ messages in thread
From: Florian Westphal @ 2017-10-11 8:28 UTC (permalink / raw)
To: netdev; +Cc: Florian Westphal
Instead of relying on rtnl mutex bump device reference count.
After this change, values reported can change in parallel, but thats not
much different from current state, as anyone can change the settings
right after rtnl_unlock (and before userspace processed reply).
While at it, switch to GFP_KERNEL allocation.
Signed-off-by: Florian Westphal <fw@strlen.de>
---
net/ipv6/addrconf.c | 24 ++++++++++++++----------
1 file changed, 14 insertions(+), 10 deletions(-)
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index d9f6226694eb..5207f567ef28 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -616,23 +616,23 @@ static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
{
struct net *net = sock_net(in_skb->sk);
struct nlattr *tb[NETCONFA_MAX+1];
+ struct inet6_dev *in6_dev = NULL;
+ struct net_device *dev = NULL;
struct netconfmsg *ncm;
struct sk_buff *skb;
struct ipv6_devconf *devconf;
- struct inet6_dev *in6_dev;
- struct net_device *dev;
int ifindex;
int err;
err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
devconf_ipv6_policy, extack);
if (err < 0)
- goto errout;
+ return err;
- err = -EINVAL;
if (!tb[NETCONFA_IFINDEX])
- goto errout;
+ return -EINVAL;
+ err = -EINVAL;
ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
switch (ifindex) {
case NETCONFA_IFINDEX_ALL:
@@ -642,10 +642,10 @@ static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
devconf = net->ipv6.devconf_dflt;
break;
default:
- dev = __dev_get_by_index(net, ifindex);
+ dev = dev_get_by_index(net, ifindex);
if (!dev)
- goto errout;
- in6_dev = __in6_dev_get(dev);
+ return -EINVAL;
+ in6_dev = in6_dev_get(dev);
if (!in6_dev)
goto errout;
devconf = &in6_dev->cnf;
@@ -653,7 +653,7 @@ static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
}
err = -ENOBUFS;
- skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
+ skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
if (!skb)
goto errout;
@@ -669,6 +669,10 @@ static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
}
err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
errout:
+ if (in6_dev)
+ in6_dev_put(in6_dev);
+ if (dev)
+ dev_put(dev);
return err;
}
@@ -6570,7 +6574,7 @@ int __init addrconf_init(void)
__rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
inet6_dump_ifacaddr, 0);
__rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
- inet6_netconf_dump_devconf, 0);
+ inet6_netconf_dump_devconf, RTNL_FLAG_DOIT_UNLOCKED);
ipv6_addr_label_rtnl_register();
--
2.13.6
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH net-next 2/2] ipv6: addrconf: don't use rtnl mutex in RTM_GETADDR
2017-10-11 8:27 [PATCH net-next 0/2] ipv6: addrconf: make two more doit functions not use rtnl mutex Florian Westphal
2017-10-11 8:28 ` [PATCH net-next 1/2] ipv6: addrconf: don't use rtnl mutex in RTM_GETNETCONF Florian Westphal
@ 2017-10-11 8:28 ` Florian Westphal
2017-10-12 3:17 ` David Miller
1 sibling, 1 reply; 5+ messages in thread
From: Florian Westphal @ 2017-10-11 8:28 UTC (permalink / raw)
To: netdev; +Cc: Florian Westphal
Similar to the previous patch, use the device lookup functions
that bump device refcount and flag this as DOIT_UNLOCKED to avoid
rtnl mutex.
Signed-off-by: Florian Westphal <fw@strlen.de>
---
net/ipv6/addrconf.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 5207f567ef28..4603aa488f4f 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -4890,17 +4890,15 @@ static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
extack);
if (err < 0)
- goto errout;
+ return err;
addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
- if (!addr) {
- err = -EINVAL;
- goto errout;
- }
+ if (!addr)
+ return -EINVAL;
ifm = nlmsg_data(nlh);
if (ifm->ifa_index)
- dev = __dev_get_by_index(net, ifm->ifa_index);
+ dev = dev_get_by_index(net, ifm->ifa_index);
ifa = ipv6_get_ifaddr(net, addr, dev, 1);
if (!ifa) {
@@ -4926,6 +4924,8 @@ static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
errout_ifa:
in6_ifa_put(ifa);
errout:
+ if (dev)
+ dev_put(dev);
return err;
}
@@ -6568,7 +6568,7 @@ int __init addrconf_init(void)
__rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, 0);
__rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, 0);
__rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
- inet6_dump_ifaddr, 0);
+ inet6_dump_ifaddr, RTNL_FLAG_DOIT_UNLOCKED);
__rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
inet6_dump_ifmcaddr, 0);
__rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
--
2.13.6
^ permalink raw reply related [flat|nested] 5+ messages in thread