Merge remote-tracking branch 'net-next/master'

[karo-tx-linux.git] / net / netlink / af_netlink.c

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 92f4b6915e8989ee6cb504dd3c84d505bd12b395..e0ccd84d4d6781ab761349e0ac913f6ddc3e8994 100644 (file)
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1364,7 +1364,72 @@ retry:
        return err;
 }
 
-static inline int netlink_capable(const struct socket *sock, unsigned int flag)
+/**
+ * __netlink_ns_capable - General netlink message capability test
+ * @nsp: NETLINK_CB of the socket buffer holding a netlink command from userspace.
+ * @user_ns: The user namespace of the capability to use
+ * @cap: The capability to use
+ *
+ * Test to see if the opener of the socket we received the message
+ * from had when the netlink socket was created and the sender of the
+ * message has has the capability @cap in the user namespace @user_ns.
+ */
+bool __netlink_ns_capable(const struct netlink_skb_parms *nsp,
+                       struct user_namespace *user_ns, int cap)
+{
+       return sk_ns_capable(nsp->sk, user_ns, cap);
+}
+EXPORT_SYMBOL(__netlink_ns_capable);
+
+/**
+ * netlink_ns_capable - General netlink message capability test
+ * @skb: socket buffer holding a netlink command from userspace
+ * @user_ns: The user namespace of the capability to use
+ * @cap: The capability to use
+ *
+ * Test to see if the opener of the socket we received the message
+ * from had when the netlink socket was created and the sender of the
+ * message has has the capability @cap in the user namespace @user_ns.
+ */
+bool netlink_ns_capable(const struct sk_buff *skb,
+                       struct user_namespace *user_ns, int cap)
+{
+       return __netlink_ns_capable(&NETLINK_CB(skb), user_ns, cap);
+}
+EXPORT_SYMBOL(netlink_ns_capable);
+
+/**
+ * netlink_capable - Netlink global message capability test
+ * @skb: socket buffer holding a netlink command from userspace
+ * @cap: The capability to use
+ *
+ * Test to see if the opener of the socket we received the message
+ * from had when the netlink socket was created and the sender of the
+ * message has has the capability @cap in all user namespaces.
+ */
+bool netlink_capable(const struct sk_buff *skb, int cap)
+{
+       return netlink_ns_capable(skb, &init_user_ns, cap);
+}
+EXPORT_SYMBOL(netlink_capable);
+
+/**
+ * netlink_net_capable - Netlink network namespace message capability test
+ * @skb: socket buffer holding a netlink command from userspace
+ * @cap: The capability to use
+ *
+ * Test to see if the opener of the socket we received the message
+ * from had when the netlink socket was created and the sender of the
+ * message has has the capability @cap over the network namespace of
+ * the socket we received the message from.
+ */
+bool netlink_net_capable(const struct sk_buff *skb, int cap)
+{
+       return netlink_ns_capable(skb, sock_net(skb->sk)->user_ns, cap);
+}
+EXPORT_SYMBOL(netlink_net_capable);
+
+static inline int netlink_allowed(const struct socket *sock, unsigned int flag)
 {
        return (nl_table[sock->sk->sk_protocol].flags & flag) ||
                ns_capable(sock_net(sock->sk)->user_ns, CAP_NET_ADMIN);
@@ -1446,7 +1511,7 @@ static int netlink_bind(struct socket *sock, struct sockaddr *addr,
 
        /* Only superuser is allowed to listen multicasts */
        if (groups) {
-               if (!netlink_capable(sock, NL_CFG_F_NONROOT_RECV))
+               if (!netlink_allowed(sock, NL_CFG_F_NONROOT_RECV))
                        return -EPERM;
                err = netlink_realloc_groups(sk);
                if (err)
@@ -1516,7 +1581,7 @@ static int netlink_connect(struct socket *sock, struct sockaddr *addr,
                return -EINVAL;
 
        if ((nladdr->nl_groups || nladdr->nl_pid) &&
-           !netlink_capable(sock, NL_CFG_F_NONROOT_SEND))
+           !netlink_allowed(sock, NL_CFG_F_NONROOT_SEND))
                return -EPERM;
 
        if (!nlk->portid)
@@ -2122,7 +2187,7 @@ static int netlink_setsockopt(struct socket *sock, int level, int optname,
                break;
        case NETLINK_ADD_MEMBERSHIP:
        case NETLINK_DROP_MEMBERSHIP: {
-               if (!netlink_capable(sock, NL_CFG_F_NONROOT_RECV))
+               if (!netlink_allowed(sock, NL_CFG_F_NONROOT_RECV))
                        return -EPERM;
                err = netlink_realloc_groups(sk);
                if (err)
@@ -2277,7 +2342,7 @@ static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock,
                dst_group = ffs(addr->nl_groups);
                err =  -EPERM;
                if ((dst_group || dst_portid) &&
-                   !netlink_capable(sock, NL_CFG_F_NONROOT_SEND))
+                   !netlink_allowed(sock, NL_CFG_F_NONROOT_SEND))
                        goto out;
        } else {
                dst_portid = nlk->dst_portid;