diff options
Diffstat (limited to 'net/mptcp/token.c')
| -rw-r--r-- | net/mptcp/token.c | 47 |
1 files changed, 24 insertions, 23 deletions
diff --git a/net/mptcp/token.c b/net/mptcp/token.c index 84d887806090..33352dd99d4d 100644 --- a/net/mptcp/token.c +++ b/net/mptcp/token.c @@ -40,7 +40,7 @@ static int token_used __read_mostly; /** * mptcp_token_new_request - create new key/idsn/token for subflow_request - * @req - the request socket + * @req: the request socket * * This function is called when a new mptcp connection is coming in. * @@ -80,7 +80,7 @@ int mptcp_token_new_request(struct request_sock *req) /** * mptcp_token_new_connect - create new key/idsn/token for subflow - * @sk - the socket that will initiate a connection + * @sk: the socket that will initiate a connection * * This function is called when a new outgoing mptcp connection is * initiated. @@ -125,51 +125,52 @@ int mptcp_token_new_connect(struct sock *sk) /** * mptcp_token_new_accept - insert token for later processing * @token: the token to insert to the tree + * @conn: the just cloned socket linked to the new connection * * Called when a SYN packet creates a new logical connection, i.e. * is not a join request. - * - * We don't have an mptcp socket yet at that point. - * This is paired with mptcp_token_update_accept, called on accept(). */ -int mptcp_token_new_accept(u32 token) +int mptcp_token_new_accept(u32 token, struct sock *conn) { int err; spin_lock_bh(&token_tree_lock); - err = radix_tree_insert(&token_tree, token, &token_used); + err = radix_tree_insert(&token_tree, token, conn); spin_unlock_bh(&token_tree_lock); return err; } /** - * mptcp_token_update_accept - update token to map to mptcp socket - * @conn: the new struct mptcp_sock - * @sk: the initial subflow for this mptcp socket + * mptcp_token_get_sock - retrieve mptcp connection sock using its token + * @token: token of the mptcp connection to retrieve + * + * This function returns the mptcp connection structure with the given token. + * A reference count on the mptcp socket returned is taken. * - * Called when the first mptcp socket is created on accept to - * refresh the dummy mapping (done to reserve the token) with - * the mptcp_socket structure that wasn't allocated before. + * returns NULL if no connection with the given token value exists. */ -void mptcp_token_update_accept(struct sock *sk, struct sock *conn) +struct mptcp_sock *mptcp_token_get_sock(u32 token) { - struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); - void __rcu **slot; + struct sock *conn; spin_lock_bh(&token_tree_lock); - slot = radix_tree_lookup_slot(&token_tree, subflow->token); - WARN_ON_ONCE(!slot); - if (slot) { - WARN_ON_ONCE(rcu_access_pointer(*slot) != &token_used); - radix_tree_replace_slot(&token_tree, slot, conn); + conn = radix_tree_lookup(&token_tree, token); + if (conn) { + /* token still reserved? */ + if (conn == (struct sock *)&token_used) + conn = NULL; + else + sock_hold(conn); } spin_unlock_bh(&token_tree_lock); + + return mptcp_sk(conn); } /** * mptcp_token_destroy_request - remove mptcp connection/token - * @token - token of mptcp connection to remove + * @token: token of mptcp connection to remove * * Remove not-yet-fully-established incoming connection identified * by @token. @@ -183,7 +184,7 @@ void mptcp_token_destroy_request(u32 token) /** * mptcp_token_destroy - remove mptcp connection/token - * @token - token of mptcp connection to remove + * @token: token of mptcp connection to remove * * Remove the connection identified by @token. */ |