diff options
Diffstat (limited to 'net/core/rtnetlink.c')
| -rw-r--r-- | net/core/rtnetlink.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index d45946177bc8..dd4e50dfa248 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -62,6 +62,7 @@ struct rtnl_link { rtnl_doit_func doit; rtnl_dumpit_func dumpit; + unsigned int flags; }; static DEFINE_MUTEX(rtnl_mutex); @@ -184,6 +185,7 @@ int __rtnl_register(int protocol, int msgtype, tab[msgindex].doit = doit; if (dumpit) tab[msgindex].dumpit = dumpit; + tab[msgindex].flags |= flags; return 0; } @@ -233,6 +235,7 @@ int rtnl_unregister(int protocol, int msgtype) handlers[msgindex].doit = NULL; handlers[msgindex].dumpit = NULL; + handlers[msgindex].flags = 0; rtnl_unlock(); return 0; @@ -4143,6 +4146,7 @@ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, struct rtnl_link *handlers; int err = -EOPNOTSUPP; rtnl_doit_func doit; + unsigned int flags; int kind; int family; int type; @@ -4209,6 +4213,17 @@ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, return err; } + flags = READ_ONCE(handlers[type].flags); + if (flags & RTNL_FLAG_DOIT_UNLOCKED) { + refcount_inc(&rtnl_msg_handlers_ref[family]); + doit = READ_ONCE(handlers[type].doit); + rcu_read_unlock(); + if (doit) + err = doit(skb, nlh, extack); + refcount_dec(&rtnl_msg_handlers_ref[family]); + return err; + } + rcu_read_unlock(); rtnl_lock(); |