mptcp: avoid lock_fast usage in accept path
Once event support is added this may need to allocate memory while msk
lock is held with softirqs disabled.
Not using lock_fast also allows to do the allocation with GFP_KERNEL.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/genetlink.h b/include/net/genetlink.h
index e55ec15..7cb3fa8 100644
--- a/include/net/genetlink.h
+++ b/include/net/genetlink.h
@@ -14,6 +14,7 @@
*/
struct genl_multicast_group {
char name[GENL_NAMSIZ];
+ u8 flags;
};
struct genl_ops;
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 56240b8..fe6da1b 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -3260,9 +3260,8 @@ static int mptcp_stream_accept(struct socket *sock, struct socket *newsock,
struct mptcp_sock *msk = mptcp_sk(newsock->sk);
struct mptcp_subflow_context *subflow;
struct sock *newsk = newsock->sk;
- bool slowpath;
- slowpath = lock_sock_fast(newsk);
+ lock_sock(newsk);
/* PM/worker can now acquire the first subflow socket
* lock without racing with listener queue cleanup,
@@ -3288,7 +3287,7 @@ static int mptcp_stream_accept(struct socket *sock, struct socket *newsock,
if (!ssk->sk_socket)
mptcp_sock_graft(ssk, newsock);
}
- unlock_sock_fast(newsk, slowpath);
+ release_sock(newsk);
}
if (inet_csk_listen_poll(ssock->sk))
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index c992424..2d6fdf4 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -1360,11 +1360,43 @@ static struct genl_family genl_ctrl __ro_after_init = {
.netnsok = true,
};
+static int genl_bind(struct net *net, int group)
+{
+ const struct genl_family *family;
+ unsigned int id;
+ int ret = 0;
+
+ genl_lock_all();
+
+ idr_for_each_entry(&genl_fam_idr, family, id) {
+ const struct genl_multicast_group *grp;
+ int i;
+
+ if (family->n_mcgrps == 0)
+ continue;
+
+ i = group - family->mcgrp_offset;
+ if (i < 0 || i >= family->n_mcgrps)
+ continue;
+
+ grp = &family->mcgrps[i];
+ if ((grp->flags & GENL_UNS_ADMIN_PERM) &&
+ !ns_capable(net->user_ns, CAP_NET_ADMIN))
+ ret = -EPERM;
+
+ break;
+ }
+
+ genl_unlock_all();
+ return ret;
+}
+
static int __net_init genl_pernet_init(struct net *net)
{
struct netlink_kernel_cfg cfg = {
.input = genl_rcv,
.flags = NL_CFG_F_NONROOT_RECV,
+ .bind = genl_bind,
};
/* we'll bump the group number right afterwards */
