tcp, ulp: Add clone operation to tcp_ulp_ops

If ULP is used on a listening socket, icsk_ulp_ops and icsk_ulp_data are
copied when the listener is cloned. Sometimes the clone is immediately
deleted, which will invoke the release op on the clone and likely
corrupt the listening socket's icsk_ulp_data.

The clone operation is invoked immediately after the clone is copied and
gives the ULP type an opportunity to set up the clone socket and its
icsk_ulp_data.

The MPTCP ULP clone will silently fallback to plain TCP on allocation
failure, so 'clone()' does not need to return an error code.

v6 -> v7:
 - move and rename ulp clone helper to make it inline-friendly
v5 -> v6:
 - clarified MPTCP clone usage in commit message

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/tcp.h b/include/net/tcp.h
index 85f1d7f..ac52633 100644 (file)
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -2154,6 +2154,9 @@ struct tcp_ulp_ops {
        /* diagnostic */
        int (*get_info)(const struct sock *sk, struct sk_buff *skb);
        size_t (*get_info_size)(const struct sock *sk);
+       /* clone ulp */
+       void (*clone)(const struct request_sock *req, struct sock *newsk,
+                     const gfp_t priority);
 
        char            name[TCP_ULP_NAME_MAX];
        struct module   *owner;

diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 18c0d5b..6a691fd 100644 (file)
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -770,6 +770,18 @@ void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
 }
 EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add);
 
+static void inet_clone_ulp(const struct request_sock *req, struct sock *newsk,
+                          const gfp_t priority)
+{
+       struct inet_connection_sock *icsk = inet_csk(newsk);
+
+       if (!icsk->icsk_ulp_ops)
+               return;
+
+       if (icsk->icsk_ulp_ops->clone)
+               icsk->icsk_ulp_ops->clone(req, newsk, priority);
+}
+
 /**
  *     inet_csk_clone_lock - clone an inet socket, and lock its clone
  *     @sk: the socket to clone
@@ -810,6 +822,8 @@ struct sock *inet_csk_clone_lock(const struct sock *sk,
                /* Deinitialize accept_queue to trap illegal accesses. */
                memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue));
 
+               inet_clone_ulp(req, newsk, priority);
+
                security_inet_csk_clone(newsk, req);
        }
        return newsk;