mptcp: avoid processing packet if a subflow reset

If check_fully_established() causes a subflow reset, it should not
continue to process the packet in tcp_data_queue().
Add a return value to mptcp_incoming_options(), and return false if a
subflow has been reset, else return true. Then drop the packet in
tcp_data_queue()/tcp_rcv_state_process() if mptcp_incoming_options()
return false.

Fixes: d582484726c4 ("mptcp: fix fallback for MP_JOIN subflows")
Signed-off-by: Jianguo Wu <wujianguo@chinatelecom.cn>
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/mptcp.h b/include/net/mptcp.h
index cb580b0..8b5af68 100644 (file)
--- a/include/net/mptcp.h
+++ b/include/net/mptcp.h
@@ -105,7 +105,7 @@ bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
 bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
                               unsigned int *size, unsigned int remaining,
                               struct mptcp_out_options *opts);
-void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb);
+bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb);
 
 void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
                         struct mptcp_out_options *opts);
@@ -227,9 +227,10 @@ static inline bool mptcp_established_options(struct sock *sk,
        return false;
 }
 
-static inline void mptcp_incoming_options(struct sock *sk,
+static inline bool mptcp_incoming_options(struct sock *sk,
                                          struct sk_buff *skb)
 {
+       return true;
 }
 
 static inline void mptcp_skb_ext_move(struct sk_buff *to,

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index a5a8d0a..149ceb5 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4247,6 +4247,9 @@ void tcp_reset(struct sock *sk, struct sk_buff *skb)
 {
        trace_tcp_receive_reset(sk);
 
+       /* mptcp can't tell us to ignore reset pkts,
+        * so just ignore the return value of mptcp_incoming_options().
+        */
        if (sk_is_mptcp(sk))
                mptcp_incoming_options(sk, skb);
 
@@ -4941,8 +4944,13 @@ static void tcp_data_queue(struct sock *sk, struct sk_buff *skb)
        bool fragstolen;
        int eaten;
 
-       if (sk_is_mptcp(sk))
-               mptcp_incoming_options(sk, skb);
+       /* If a subflow has been reset, the packet should not continue
+        * to be processed, drop the packet.
+        */
+       if (sk_is_mptcp(sk) && !mptcp_incoming_options(sk, skb)) {
+               __kfree_skb(skb);
+               return;
+       }
 
        if (TCP_SKB_CB(skb)->seq == TCP_SKB_CB(skb)->end_seq) {
                __kfree_skb(skb);
@@ -6523,8 +6531,11 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
        case TCP_CLOSING:
        case TCP_LAST_ACK:
                if (!before(TCP_SKB_CB(skb)->seq, tp->rcv_nxt)) {
-                       if (sk_is_mptcp(sk))
-                               mptcp_incoming_options(sk, skb);
+                       /* If a subflow has been reset, the packet should not
+                        * continue to be processed, drop the packet.
+                        */
+                       if (sk_is_mptcp(sk) && !mptcp_incoming_options(sk, skb))
+                               goto discard;
                        break;
                }
                fallthrough;

diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index b5850af..4452455 100644 (file)
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -1035,7 +1035,8 @@ static bool add_addr_hmac_valid(struct mptcp_sock *msk,
        return hmac == mp_opt->ahmac;
 }
 
-void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb)
+/* Return false if a subflow has been reset, else return true */
+bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb)
 {
        struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
        struct mptcp_sock *msk = mptcp_sk(subflow->conn);
@@ -1053,12 +1054,16 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb)
                        __mptcp_check_push(subflow->conn, sk);
                __mptcp_data_acked(subflow->conn);
                mptcp_data_unlock(subflow->conn);
-               return;
+               return true;
        }
 
        mptcp_get_options(sk, skb, &mp_opt);
+
+       /* The subflow can be in close state only if check_fully_established()
+        * just sent a reset. If so, tell the caller to ignore the current packet.
+        */
        if (!check_fully_established(msk, sk, subflow, skb, &mp_opt))
-               return;
+               return sk->sk_state != TCP_CLOSE;
 
        if (mp_opt.fastclose &&
            msk->local_key == mp_opt.rcvr_key) {
@@ -1100,7 +1105,7 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb)
        }
 
        if (!mp_opt.dss)
-               return;
+               return true;
 
        /* we can't wait for recvmsg() to update the ack_seq, otherwise
         * monodirectional flows will stuck
@@ -1119,12 +1124,12 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb)
                    schedule_work(&msk->work))
                        sock_hold(subflow->conn);
 
-               return;
+               return true;
        }
 
        mpext = skb_ext_add(skb, SKB_EXT_MPTCP);
        if (!mpext)
-               return;
+               return true;
 
        memset(mpext, 0, sizeof(*mpext));
 
@@ -1153,6 +1158,8 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb)
                if (mpext->csum_reqd)
                        mpext->csum = mp_opt.csum;
        }
+
+       return true;
 }
 
 static void mptcp_set_rwin(const struct tcp_sock *tp)