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mptcp: refactor token container
Replace the radix tree with a hash table allocated at boot time. The radix tree has some shortcoming: a single lock is contented by all the mptcp operation, the lookup currently use such lock, and traversing all the items would require a lock, too. With hash table instead we trade a little memory to address all the above - a per bucket lock is used. To hash the MPTCP sockets, we re-use the msk' sk_node entry: the MPTCP sockets are never hashed by the stack. Replace the existing hash proto callbacks with a dummy implementation, annotating the above constraint. Additionally refactor the token creation to code to: - limit the number of consecutive attempts to a fixed maximum. Hitting a hash bucket with a long chain is considered a failed attempt - accept() no longer can fail to token management. - if token creation fails at connect() time, we do fallback to TCP (before the connection was closed) v1 -> v2: - fix "no newline at end of file" - Jakub Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni
David S. Miller
parent
d39dceca38
commit
2c5ebd001d
@ -1448,20 +1448,6 @@ struct sock *mptcp_sk_clone(const struct sock *sk,
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msk->token = subflow_req->token;
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msk->subflow = NULL;
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if (unlikely(mptcp_token_new_accept(subflow_req->token, nsk))) {
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nsk->sk_state = TCP_CLOSE;
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bh_unlock_sock(nsk);
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/* we can't call into mptcp_close() here - possible BH context
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* free the sock directly.
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* sk_clone_lock() sets nsk refcnt to two, hence call sk_free()
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* too.
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*/
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sk_common_release(nsk);
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sk_free(nsk);
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return NULL;
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}
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msk->write_seq = subflow_req->idsn + 1;
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atomic64_set(&msk->snd_una, msk->write_seq);
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if (mp_opt->mp_capable) {
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@ -1547,7 +1533,7 @@ static void mptcp_destroy(struct sock *sk)
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{
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struct mptcp_sock *msk = mptcp_sk(sk);
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mptcp_token_destroy(msk->token);
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mptcp_token_destroy(msk);
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if (msk->cached_ext)
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__skb_ext_put(msk->cached_ext);
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@ -1636,6 +1622,20 @@ static void mptcp_release_cb(struct sock *sk)
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}
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}
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static int mptcp_hash(struct sock *sk)
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{
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/* should never be called,
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* we hash the TCP subflows not the master socket
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*/
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WARN_ON_ONCE(1);
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return 0;
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}
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static void mptcp_unhash(struct sock *sk)
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{
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/* called from sk_common_release(), but nothing to do here */
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}
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static int mptcp_get_port(struct sock *sk, unsigned short snum)
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{
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struct mptcp_sock *msk = mptcp_sk(sk);
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@ -1679,7 +1679,6 @@ void mptcp_finish_connect(struct sock *ssk)
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*/
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WRITE_ONCE(msk->remote_key, subflow->remote_key);
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WRITE_ONCE(msk->local_key, subflow->local_key);
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WRITE_ONCE(msk->token, subflow->token);
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WRITE_ONCE(msk->write_seq, subflow->idsn + 1);
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WRITE_ONCE(msk->ack_seq, ack_seq);
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WRITE_ONCE(msk->can_ack, 1);
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@ -1761,8 +1760,8 @@ static struct proto mptcp_prot = {
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.sendmsg = mptcp_sendmsg,
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.recvmsg = mptcp_recvmsg,
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.release_cb = mptcp_release_cb,
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.hash = inet_hash,
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.unhash = inet_unhash,
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.hash = mptcp_hash,
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.unhash = mptcp_unhash,
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.get_port = mptcp_get_port,
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.sockets_allocated = &mptcp_sockets_allocated,
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.memory_allocated = &tcp_memory_allocated,
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@ -1771,6 +1770,7 @@ static struct proto mptcp_prot = {
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.sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_tcp_wmem),
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.sysctl_mem = sysctl_tcp_mem,
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.obj_size = sizeof(struct mptcp_sock),
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.slab_flags = SLAB_TYPESAFE_BY_RCU,
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.no_autobind = true,
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};
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@ -1800,6 +1800,7 @@ static int mptcp_stream_connect(struct socket *sock, struct sockaddr *uaddr,
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int addr_len, int flags)
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{
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struct mptcp_sock *msk = mptcp_sk(sock->sk);
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struct mptcp_subflow_context *subflow;
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struct socket *ssock;
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int err;
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@ -1812,19 +1813,23 @@ static int mptcp_stream_connect(struct socket *sock, struct sockaddr *uaddr,
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goto do_connect;
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}
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mptcp_token_destroy(msk);
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ssock = __mptcp_socket_create(msk, TCP_SYN_SENT);
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if (IS_ERR(ssock)) {
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err = PTR_ERR(ssock);
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goto unlock;
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}
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subflow = mptcp_subflow_ctx(ssock->sk);
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#ifdef CONFIG_TCP_MD5SIG
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/* no MPTCP if MD5SIG is enabled on this socket or we may run out of
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* TCP option space.
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*/
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if (rcu_access_pointer(tcp_sk(ssock->sk)->md5sig_info))
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mptcp_subflow_ctx(ssock->sk)->request_mptcp = 0;
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subflow->request_mptcp = 0;
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#endif
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if (subflow->request_mptcp && mptcp_token_new_connect(ssock->sk))
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subflow->request_mptcp = 0;
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do_connect:
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err = ssock->ops->connect(ssock, uaddr, addr_len, flags);
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@ -1888,6 +1893,7 @@ static int mptcp_listen(struct socket *sock, int backlog)
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pr_debug("msk=%p", msk);
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lock_sock(sock->sk);
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mptcp_token_destroy(msk);
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ssock = __mptcp_socket_create(msk, TCP_LISTEN);
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if (IS_ERR(ssock)) {
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err = PTR_ERR(ssock);
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@ -2086,6 +2092,7 @@ void __init mptcp_proto_init(void)
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mptcp_subflow_init();
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mptcp_pm_init();
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mptcp_token_init();
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if (proto_register(&mptcp_prot, 1) != 0)
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panic("Failed to register MPTCP proto.\n");
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@ -250,6 +250,7 @@ struct mptcp_subflow_request_sock {
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u32 local_nonce;
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u32 remote_nonce;
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struct mptcp_sock *msk;
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struct hlist_nulls_node token_node;
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};
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static inline struct mptcp_subflow_request_sock *
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@ -372,12 +373,19 @@ bool mptcp_finish_join(struct sock *sk);
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void mptcp_data_acked(struct sock *sk);
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void mptcp_subflow_eof(struct sock *sk);
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void __init mptcp_token_init(void);
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static inline void mptcp_token_init_request(struct request_sock *req)
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{
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mptcp_subflow_rsk(req)->token_node.pprev = NULL;
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}
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int mptcp_token_new_request(struct request_sock *req);
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void mptcp_token_destroy_request(u32 token);
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void mptcp_token_destroy_request(struct request_sock *req);
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int mptcp_token_new_connect(struct sock *sk);
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int mptcp_token_new_accept(u32 token, struct sock *conn);
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void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
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struct mptcp_sock *msk);
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struct mptcp_sock *mptcp_token_get_sock(u32 token);
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void mptcp_token_destroy(u32 token);
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void mptcp_token_destroy(struct mptcp_sock *msk);
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void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
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static inline void mptcp_crypto_key_gen_sha(u64 *key, u32 *token, u64 *idsn)
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@ -32,12 +32,9 @@ static void SUBFLOW_REQ_INC_STATS(struct request_sock *req,
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static int subflow_rebuild_header(struct sock *sk)
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{
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struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
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int local_id, err = 0;
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int local_id;
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if (subflow->request_mptcp && !subflow->token) {
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pr_debug("subflow=%p", sk);
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err = mptcp_token_new_connect(sk);
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} else if (subflow->request_join && !subflow->local_nonce) {
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if (subflow->request_join && !subflow->local_nonce) {
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struct mptcp_sock *msk = (struct mptcp_sock *)subflow->conn;
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pr_debug("subflow=%p", sk);
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@ -57,9 +54,6 @@ static int subflow_rebuild_header(struct sock *sk)
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}
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out:
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if (err)
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return err;
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return subflow->icsk_af_ops->rebuild_header(sk);
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}
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@ -72,8 +66,7 @@ static void subflow_req_destructor(struct request_sock *req)
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if (subflow_req->msk)
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sock_put((struct sock *)subflow_req->msk);
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if (subflow_req->mp_capable)
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mptcp_token_destroy_request(subflow_req->token);
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mptcp_token_destroy_request(req);
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tcp_request_sock_ops.destructor(req);
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}
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@ -135,6 +128,7 @@ static void subflow_init_req(struct request_sock *req,
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subflow_req->mp_capable = 0;
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subflow_req->mp_join = 0;
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subflow_req->msk = NULL;
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mptcp_token_init_request(req);
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#ifdef CONFIG_TCP_MD5SIG
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/* no MPTCP if MD5SIG is enabled on this socket or we may run out of
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@ -250,7 +244,7 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb)
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subflow->remote_nonce = mp_opt.nonce;
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pr_debug("subflow=%p, thmac=%llu, remote_nonce=%u", subflow,
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subflow->thmac, subflow->remote_nonce);
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} else if (subflow->request_mptcp) {
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} else {
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tp->is_mptcp = 0;
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}
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@ -386,7 +380,7 @@ static void mptcp_sock_destruct(struct sock *sk)
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sock_orphan(sk);
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}
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mptcp_token_destroy(mptcp_sk(sk)->token);
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mptcp_token_destroy(mptcp_sk(sk));
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inet_sock_destruct(sk);
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}
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@ -505,6 +499,7 @@ create_child:
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*/
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new_msk->sk_destruct = mptcp_sock_destruct;
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mptcp_pm_new_connection(mptcp_sk(new_msk), 1);
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mptcp_token_accept(subflow_req, mptcp_sk(new_msk));
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ctx->conn = new_msk;
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new_msk = NULL;
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@ -24,7 +24,7 @@
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/radix-tree.h>
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#include <linux/memblock.h>
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#include <linux/ip.h>
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#include <linux/tcp.h>
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#include <net/sock.h>
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@ -33,10 +33,55 @@
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#include <net/mptcp.h>
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#include "protocol.h"
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static RADIX_TREE(token_tree, GFP_ATOMIC);
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static RADIX_TREE(token_req_tree, GFP_ATOMIC);
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static DEFINE_SPINLOCK(token_tree_lock);
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static int token_used __read_mostly;
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#define TOKEN_MAX_RETRIES 4
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#define TOKEN_MAX_CHAIN_LEN 4
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struct token_bucket {
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spinlock_t lock;
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int chain_len;
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struct hlist_nulls_head req_chain;
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struct hlist_nulls_head msk_chain;
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};
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static struct token_bucket *token_hash __read_mostly;
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static unsigned int token_mask __read_mostly;
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static struct token_bucket *token_bucket(u32 token)
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{
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return &token_hash[token & token_mask];
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}
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/* called with bucket lock held */
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static struct mptcp_subflow_request_sock *
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__token_lookup_req(struct token_bucket *t, u32 token)
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{
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struct mptcp_subflow_request_sock *req;
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struct hlist_nulls_node *pos;
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hlist_nulls_for_each_entry_rcu(req, pos, &t->req_chain, token_node)
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if (req->token == token)
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return req;
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return NULL;
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}
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/* called with bucket lock held */
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static struct mptcp_sock *
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__token_lookup_msk(struct token_bucket *t, u32 token)
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{
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struct hlist_nulls_node *pos;
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struct sock *sk;
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sk_nulls_for_each_rcu(sk, pos, &t->msk_chain)
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if (mptcp_sk(sk)->token == token)
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return mptcp_sk(sk);
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return NULL;
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}
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static bool __token_bucket_busy(struct token_bucket *t, u32 token)
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{
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return !token || t->chain_len >= TOKEN_MAX_CHAIN_LEN ||
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__token_lookup_req(t, token) || __token_lookup_msk(t, token);
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}
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/**
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* mptcp_token_new_request - create new key/idsn/token for subflow_request
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@ -52,30 +97,32 @@ static int token_used __read_mostly;
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int mptcp_token_new_request(struct request_sock *req)
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{
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struct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req);
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int err;
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int retries = TOKEN_MAX_RETRIES;
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struct token_bucket *bucket;
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u32 token;
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while (1) {
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u32 token;
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again:
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mptcp_crypto_key_gen_sha(&subflow_req->local_key,
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&subflow_req->token,
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&subflow_req->idsn);
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pr_debug("req=%p local_key=%llu, token=%u, idsn=%llu\n",
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req, subflow_req->local_key, subflow_req->token,
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subflow_req->idsn);
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mptcp_crypto_key_gen_sha(&subflow_req->local_key,
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&subflow_req->token,
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&subflow_req->idsn);
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pr_debug("req=%p local_key=%llu, token=%u, idsn=%llu\n",
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req, subflow_req->local_key, subflow_req->token,
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subflow_req->idsn);
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token = subflow_req->token;
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spin_lock_bh(&token_tree_lock);
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if (!radix_tree_lookup(&token_req_tree, token) &&
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!radix_tree_lookup(&token_tree, token))
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break;
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spin_unlock_bh(&token_tree_lock);
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token = subflow_req->token;
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bucket = token_bucket(token);
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spin_lock_bh(&bucket->lock);
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if (__token_bucket_busy(bucket, token)) {
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spin_unlock_bh(&bucket->lock);
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if (!--retries)
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return -EBUSY;
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goto again;
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}
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err = radix_tree_insert(&token_req_tree,
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subflow_req->token, &token_used);
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spin_unlock_bh(&token_tree_lock);
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return err;
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hlist_nulls_add_head_rcu(&subflow_req->token_node, &bucket->req_chain);
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bucket->chain_len++;
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spin_unlock_bh(&bucket->lock);
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return 0;
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}
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/**
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@ -97,48 +144,56 @@ int mptcp_token_new_request(struct request_sock *req)
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int mptcp_token_new_connect(struct sock *sk)
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{
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struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
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struct sock *mptcp_sock = subflow->conn;
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int err;
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struct mptcp_sock *msk = mptcp_sk(subflow->conn);
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int retries = TOKEN_MAX_RETRIES;
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struct token_bucket *bucket;
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while (1) {
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u32 token;
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pr_debug("ssk=%p, local_key=%llu, token=%u, idsn=%llu\n",
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sk, subflow->local_key, subflow->token, subflow->idsn);
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mptcp_crypto_key_gen_sha(&subflow->local_key, &subflow->token,
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&subflow->idsn);
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again:
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mptcp_crypto_key_gen_sha(&subflow->local_key, &subflow->token,
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&subflow->idsn);
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pr_debug("ssk=%p, local_key=%llu, token=%u, idsn=%llu\n",
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sk, subflow->local_key, subflow->token, subflow->idsn);
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token = subflow->token;
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spin_lock_bh(&token_tree_lock);
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if (!radix_tree_lookup(&token_req_tree, token) &&
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!radix_tree_lookup(&token_tree, token))
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break;
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spin_unlock_bh(&token_tree_lock);
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bucket = token_bucket(subflow->token);
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spin_lock_bh(&bucket->lock);
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if (__token_bucket_busy(bucket, subflow->token)) {
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spin_unlock_bh(&bucket->lock);
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if (!--retries)
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return -EBUSY;
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goto again;
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}
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err = radix_tree_insert(&token_tree, subflow->token, mptcp_sock);
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spin_unlock_bh(&token_tree_lock);
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return err;
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WRITE_ONCE(msk->token, subflow->token);
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__sk_nulls_add_node_rcu((struct sock *)msk, &bucket->msk_chain);
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bucket->chain_len++;
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spin_unlock_bh(&bucket->lock);
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return 0;
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}
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/**
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* mptcp_token_new_accept - insert token for later processing
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* @token: the token to insert to the tree
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* @conn: the just cloned socket linked to the new connection
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* mptcp_token_accept - replace a req sk with full sock in token hash
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* @req: the request socket to be removed
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* @msk: the just cloned socket linked to the new connection
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*
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* Called when a SYN packet creates a new logical connection, i.e.
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* is not a join request.
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*/
|
||||
int mptcp_token_new_accept(u32 token, struct sock *conn)
|
||||
void mptcp_token_accept(struct mptcp_subflow_request_sock *req,
|
||||
struct mptcp_sock *msk)
|
||||
{
|
||||
int err;
|
||||
struct mptcp_subflow_request_sock *pos;
|
||||
struct token_bucket *bucket;
|
||||
|
||||
spin_lock_bh(&token_tree_lock);
|
||||
err = radix_tree_insert(&token_tree, token, conn);
|
||||
spin_unlock_bh(&token_tree_lock);
|
||||
bucket = token_bucket(req->token);
|
||||
spin_lock_bh(&bucket->lock);
|
||||
|
||||
return err;
|
||||
/* pedantic lookup check for the moved token */
|
||||
pos = __token_lookup_req(bucket, req->token);
|
||||
if (!WARN_ON_ONCE(pos != req))
|
||||
hlist_nulls_del_init_rcu(&req->token_node);
|
||||
__sk_nulls_add_node_rcu((struct sock *)msk, &bucket->msk_chain);
|
||||
spin_unlock_bh(&bucket->lock);
|
||||
}
|
||||
|
||||
/**
|
||||
@ -152,45 +207,103 @@ int mptcp_token_new_accept(u32 token, struct sock *conn)
|
||||
*/
|
||||
struct mptcp_sock *mptcp_token_get_sock(u32 token)
|
||||
{
|
||||
struct sock *conn;
|
||||
struct hlist_nulls_node *pos;
|
||||
struct token_bucket *bucket;
|
||||
struct mptcp_sock *msk;
|
||||
struct sock *sk;
|
||||
|
||||
spin_lock_bh(&token_tree_lock);
|
||||
conn = radix_tree_lookup(&token_tree, token);
|
||||
if (conn) {
|
||||
/* token still reserved? */
|
||||
if (conn == (struct sock *)&token_used)
|
||||
conn = NULL;
|
||||
else
|
||||
sock_hold(conn);
|
||||
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)
|
||||
continue;
|
||||
if (!refcount_inc_not_zero(&sk->sk_refcnt))
|
||||
goto not_found;
|
||||
if (READ_ONCE(msk->token) != token) {
|
||||
sock_put(sk);
|
||||
goto again;
|
||||
}
|
||||
goto found;
|
||||
}
|
||||
spin_unlock_bh(&token_tree_lock);
|
||||
if (get_nulls_value(pos) != (token & token_mask))
|
||||
goto again;
|
||||
|
||||
return mptcp_sk(conn);
|
||||
not_found:
|
||||
msk = NULL;
|
||||
|
||||
found:
|
||||
rcu_read_unlock();
|
||||
return msk;
|
||||
}
|
||||
|
||||
/**
|
||||
* mptcp_token_destroy_request - remove mptcp connection/token
|
||||
* @token: token of mptcp connection to remove
|
||||
* @req: mptcp request socket dropping the token
|
||||
*
|
||||
* Remove not-yet-fully-established incoming connection identified
|
||||
* by @token.
|
||||
* Remove the token associated to @req.
|
||||
*/
|
||||
void mptcp_token_destroy_request(u32 token)
|
||||
void mptcp_token_destroy_request(struct request_sock *req)
|
||||
{
|
||||
spin_lock_bh(&token_tree_lock);
|
||||
radix_tree_delete(&token_req_tree, token);
|
||||
spin_unlock_bh(&token_tree_lock);
|
||||
struct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req);
|
||||
struct mptcp_subflow_request_sock *pos;
|
||||
struct token_bucket *bucket;
|
||||
|
||||
if (hlist_nulls_unhashed(&subflow_req->token_node))
|
||||
return;
|
||||
|
||||
bucket = token_bucket(subflow_req->token);
|
||||
spin_lock_bh(&bucket->lock);
|
||||
pos = __token_lookup_req(bucket, subflow_req->token);
|
||||
if (!WARN_ON_ONCE(pos != subflow_req)) {
|
||||
hlist_nulls_del_init_rcu(&pos->token_node);
|
||||
bucket->chain_len--;
|
||||
}
|
||||
spin_unlock_bh(&bucket->lock);
|
||||
}
|
||||
|
||||
/**
|
||||
* mptcp_token_destroy - remove mptcp connection/token
|
||||
* @token: token of mptcp connection to remove
|
||||
* @msk: mptcp connection dropping the token
|
||||
*
|
||||
* Remove the connection identified by @token.
|
||||
* Remove the token associated to @msk
|
||||
*/
|
||||
void mptcp_token_destroy(u32 token)
|
||||
void mptcp_token_destroy(struct mptcp_sock *msk)
|
||||
{
|
||||
spin_lock_bh(&token_tree_lock);
|
||||
radix_tree_delete(&token_tree, token);
|
||||
spin_unlock_bh(&token_tree_lock);
|
||||
struct token_bucket *bucket;
|
||||
struct mptcp_sock *pos;
|
||||
|
||||
if (sk_unhashed((struct sock *)msk))
|
||||
return;
|
||||
|
||||
bucket = token_bucket(msk->token);
|
||||
spin_lock_bh(&bucket->lock);
|
||||
pos = __token_lookup_msk(bucket, msk->token);
|
||||
if (!WARN_ON_ONCE(pos != msk)) {
|
||||
__sk_nulls_del_node_init_rcu((struct sock *)pos);
|
||||
bucket->chain_len--;
|
||||
}
|
||||
spin_unlock_bh(&bucket->lock);
|
||||
}
|
||||
|
||||
void __init mptcp_token_init(void)
|
||||
{
|
||||
int i;
|
||||
|
||||
token_hash = alloc_large_system_hash("MPTCP token",
|
||||
sizeof(struct token_bucket),
|
||||
0,
|
||||
20,/* one slot per 1MB of memory */
|
||||
0,
|
||||
NULL,
|
||||
&token_mask,
|
||||
0,
|
||||
64 * 1024);
|
||||
for (i = 0; i < token_mask + 1; ++i) {
|
||||
INIT_HLIST_NULLS_HEAD(&token_hash[i].req_chain, i);
|
||||
INIT_HLIST_NULLS_HEAD(&token_hash[i].msk_chain, i);
|
||||
spin_lock_init(&token_hash[i].lock);
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user