diff options
Diffstat (limited to 'net/mptcp/token.c')
| -rw-r--r-- | net/mptcp/token.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/net/mptcp/token.c b/net/mptcp/token.c index f82410c54653..8b47c4bb1c6b 100644 --- a/net/mptcp/token.c +++ b/net/mptcp/token.c @@ -204,6 +204,32 @@ void mptcp_token_accept(struct mptcp_subflow_request_sock *req, spin_unlock_bh(&bucket->lock); } +bool mptcp_token_exists(u32 token) +{ + struct hlist_nulls_node *pos; + struct token_bucket *bucket; + struct mptcp_sock *msk; + struct sock *sk; + + rcu_read_lock(); + bucket = token_bucket(token); + +again: + sk_nulls_for_each_rcu(sk, pos, &bucket->msk_chain) { + msk = mptcp_sk(sk); + if (READ_ONCE(msk->token) == token) + goto found; + } + if (get_nulls_value(pos) != (token & token_mask)) + goto again; + + rcu_read_unlock(); + return false; +found: + rcu_read_unlock(); + return true; +} + /** * mptcp_token_get_sock - retrieve mptcp connection sock using its token * @token: token of the mptcp connection to retrieve |