2 /* Multipath TCP token management
48 static struct token_bucket *token_bucket(u32 token)  in token_bucket()  argument
50 	return &token_hash[token & token_mask];  in token_bucket()
55 __token_lookup_req(struct token_bucket *t, u32 token)  in __token_lookup_req()  argument
61 		if (req->token == token)  in __token_lookup_req()
68 __token_lookup_msk(struct token_bucket *t, u32 token)  in __token_lookup_msk()  argument
74 		if (mptcp_sk(sk)->token == token)  in __token_lookup_msk()
79 static bool __token_bucket_busy(struct token_bucket *t, u32 token)  in __token_bucket_busy()  argument
81 	return !token || t->chain_len >= TOKEN_MAX_CHAIN_LEN ||  in __token_bucket_busy()
82 	       __token_lookup_req(t, token) || __token_lookup_msk(t, token);  in __token_bucket_busy()
85 static void mptcp_crypto_key_gen_sha(u64 *key, u32 *token, u64 *idsn)  in mptcp_crypto_key_gen_sha()  argument
94 	mptcp_crypto_key_sha(*key, token, idsn);  in mptcp_crypto_key_gen_sha()
98  * mptcp_token_new_request - create new key/idsn/token for subflow_request
103  * It creates a unique token to identify the new mptcp connection,
112 	u32 token;  in mptcp_token_new_request()  local
115 			     &subflow_req->token,  in mptcp_token_new_request()
117 	pr_debug("req=%p local_key=%llu, token=%u, idsn=%llu\n",  in mptcp_token_new_request()
118 		 req, subflow_req->local_key, subflow_req->token,  in mptcp_token_new_request()
121 	token = subflow_req->token;  in mptcp_token_new_request()
122 	bucket = token_bucket(token);  in mptcp_token_new_request()
124 	if (__token_bucket_busy(bucket, token)) {  in mptcp_token_new_request()
136  * mptcp_token_new_connect - create new key/idsn/token for subflow
142  * It creates a unique token to identify the new mptcp connection,
146  * the computed token at a later time, this is needed to process
159 	mptcp_crypto_key_gen_sha(&subflow->local_key, &subflow->token,  in mptcp_token_new_connect()
162 	bucket = token_bucket(subflow->token);  in mptcp_token_new_connect()
164 	if (__token_bucket_busy(bucket, subflow->token)) {  in mptcp_token_new_connect()
171 	pr_debug("ssk=%p, local_key=%llu, token=%u, idsn=%llu\n",  in mptcp_token_new_connect()
172 		 sk, subflow->local_key, subflow->token, subflow->idsn);  in mptcp_token_new_connect()
174 	WRITE_ONCE(msk->token, subflow->token);  in mptcp_token_new_connect()
182  * mptcp_token_accept - replace a req sk with full sock in token hash
195 	bucket = token_bucket(req->token);  in mptcp_token_accept()
198 	/* pedantic lookup check for the moved token */  in mptcp_token_accept()
199 	pos = __token_lookup_req(bucket, req->token);  in mptcp_token_accept()
206 bool mptcp_token_exists(u32 token)  in mptcp_token_exists()  argument
214 	bucket = token_bucket(token);  in mptcp_token_exists()
219 		if (READ_ONCE(msk->token) == token)  in mptcp_token_exists()
222 	if (get_nulls_value(pos) != (token & token_mask))  in mptcp_token_exists()
233  * mptcp_token_get_sock - retrieve mptcp connection sock using its token
235  * @token: token of the mptcp connection to retrieve
237  * This function returns the mptcp connection structure with the given token.
240  * returns NULL if no connection with the given token value exists.
242 struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token)  in mptcp_token_get_sock()  argument
250 	bucket = token_bucket(token);  in mptcp_token_get_sock()
255 		if (READ_ONCE(msk->token) != token ||  in mptcp_token_get_sock()
262 		if (READ_ONCE(msk->token) != token ||  in mptcp_token_get_sock()
269 	if (get_nulls_value(pos) != (token & token_mask))  in mptcp_token_get_sock()
282  * mptcp_token_iter_next - iterate over the token container from given pos
288  * token container starting from the specified position, or NULL.
341  * mptcp_token_destroy_request - remove mptcp connection/token
342  * @req: mptcp request socket dropping the token
344  * Remove the token associated to @req.
355 	bucket = token_bucket(subflow_req->token);  in mptcp_token_destroy_request()
357 	pos = __token_lookup_req(bucket, subflow_req->token);  in mptcp_token_destroy_request()
366  * mptcp_token_destroy - remove mptcp connection/token
367  * @msk: mptcp connection dropping the token
369  * Remove the token associated to @msk
379 	bucket = token_bucket(msk->token);  in mptcp_token_destroy()
381 	pos = __token_lookup_msk(bucket, msk->token);  in mptcp_token_destroy()
387 	WRITE_ONCE(msk->token, 0);  in mptcp_token_destroy()
394 	token_hash = alloc_large_system_hash("MPTCP token",  in mptcp_token_init()