diff options
| author | Paolo Abeni <pabeni@redhat.com> | 2020-07-23 14:02:36 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-07-23 21:47:25 +0300 |
| commit | 4cf8b7e48a09745145881b311fe6a9154ba69ebc (patch) | |
| tree | 1b1a3e1a11bdb28bcf1943cdd5428abc836af391 /net/mptcp | |
| parent | 97e617518cbc318113b034a5fb33f49c81701278 (diff) | |
| download | linux-4cf8b7e48a09745145881b311fe6a9154ba69ebc.tar.xz | |
subflow: introduce and use mptcp_can_accept_new_subflow()
So that we can easily perform some basic PM-related
adimission checks before creating the child socket.
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Tested-by: Christoph Paasch <cpaasch@apple.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mptcp')
| -rw-r--r-- | net/mptcp/subflow.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c index ada04df6f99f..e645483d1200 100644 --- a/net/mptcp/subflow.c +++ b/net/mptcp/subflow.c @@ -53,6 +53,12 @@ static void subflow_generate_hmac(u64 key1, u64 key2, u32 nonce1, u32 nonce2, mptcp_crypto_hmac_sha(key1, key2, msg, 8, hmac); } +static bool mptcp_can_accept_new_subflow(const struct mptcp_sock *msk) +{ + return mptcp_is_fully_established((void *)msk) && + READ_ONCE(msk->pm.accept_subflow); +} + /* validate received token and create truncated hmac and nonce for SYN-ACK */ static struct mptcp_sock *subflow_token_join_request(struct request_sock *req, const struct sk_buff *skb) @@ -443,6 +449,7 @@ create_msk: } else if (subflow_req->mp_join) { mptcp_get_options(skb, &mp_opt); if (!mp_opt.mp_join || + !mptcp_can_accept_new_subflow(subflow_req->msk) || !subflow_hmac_valid(req, &mp_opt)) { SUBFLOW_REQ_INC_STATS(req, MPTCP_MIB_JOINACKMAC); fallback = true; |