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genl: Fix genl dumpit() locking.

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In case of genl-family with parallel ops off, dumpif() callback
is expected to run under genl_lock, But commit def3117493
(genl: Allow concurrent genl callbacks.) changed this behaviour
where only first dumpit() op was called under genl-lock.
For subsequent dump, only nlk->cb_lock was taken.
Following patch fixes it by defining locked dumpit() and done()
callback which takes care of genl-locking.

CC: Jesse Gross <jesse@nicira.com>
CC: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pravin B Shelar 2013-08-23 12:44:55 -07:00 committed by David S. Miller
parent a3097bda78
commit 9b96309c5b
1 changed files with 46 additions and 5 deletions
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51
net/netlink/genetlink.c
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@ -544,6 +544,30 @@ void *genlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,
}
EXPORT_SYMBOL(genlmsg_put);
static int genl_lock_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
{
struct genl_ops *ops = cb->data;
int rc;
genl_lock();
rc = ops->dumpit(skb, cb);
genl_unlock();
return rc;
}
static int genl_lock_done(struct netlink_callback *cb)
{
struct genl_ops *ops = cb->data;
int rc = 0;
if (ops->done) {
genl_lock();
rc = ops->done(cb);
genl_unlock();
}
return rc;
}
static int genl_family_rcv_msg(struct genl_family *family,
struct sk_buff *skb,
struct nlmsghdr *nlh)
@ -572,15 +596,32 @@ static int genl_family_rcv_msg(struct genl_family *family,
return -EPERM;
if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) {
struct netlink_dump_control c = {
.dump = ops->dumpit,
.done = ops->done,
};
int rc;
if (ops->dumpit == NULL)
return -EOPNOTSUPP;
return netlink_dump_start(net->genl_sock, skb, nlh, &c);
if (!family->parallel_ops) {
struct netlink_dump_control c = {
.data = ops,
.dump = genl_lock_dumpit,
.done = genl_lock_done,
};
genl_unlock();
rc = netlink_dump_start(net->genl_sock, skb, nlh, &c);
genl_lock();
} else {
struct netlink_dump_control c = {
.dump = ops->dumpit,
.done = ops->done,
};
rc = netlink_dump_start(net->genl_sock, skb, nlh, &c);
}
return rc;
}
if (ops->doit == NULL)