2 /* Multipath TCP token management
49 static struct token_bucket *token_bucket(u32 token)  in token_bucket()  argument
51 	return &token_hash[token & token_mask];  in token_bucket()
56 __token_lookup_req(struct token_bucket *t, u32 token)  in __token_lookup_req()  argument
62 		if (req->token == token)  in __token_lookup_req()
69 __token_lookup_msk(struct token_bucket *t, u32 token)  in __token_lookup_msk()  argument
75 		if (mptcp_sk(sk)->token == token)  in __token_lookup_msk()
80 static bool __token_bucket_busy(struct token_bucket *t, u32 token)  in __token_bucket_busy()  argument
82 	return !token || t->chain_len >= TOKEN_MAX_CHAIN_LEN ||  in __token_bucket_busy()
83 	       __token_lookup_req(t, token) || __token_lookup_msk(t, token);  in __token_bucket_busy()
86 static void mptcp_crypto_key_gen_sha(u64 *key, u32 *token, u64 *idsn)  in mptcp_crypto_key_gen_sha()  argument
95 	mptcp_crypto_key_sha(*key, token, idsn);  in mptcp_crypto_key_gen_sha()
99  * mptcp_token_new_request - create new key/idsn/token for subflow_request
104  * It creates a unique token to identify the new mptcp connection,
113 	u32 token;  in mptcp_token_new_request()  local
116 			     &subflow_req->token,  in mptcp_token_new_request()
118 	pr_debug("req=%p local_key=%llu, token=%u, idsn=%llu\n",  in mptcp_token_new_request()
119 		 req, subflow_req->local_key, subflow_req->token,  in mptcp_token_new_request()
122 	token = subflow_req->token;  in mptcp_token_new_request()
123 	bucket = token_bucket(token);  in mptcp_token_new_request()
125 	if (__token_bucket_busy(bucket, token)) {  in mptcp_token_new_request()
137  * mptcp_token_new_connect - create new key/idsn/token for subflow
143  * It creates a unique token to identify the new mptcp connection,
147  * the computed token at a later time, this is needed to process
159 	pr_debug("ssk=%p, local_key=%llu, token=%u, idsn=%llu\n",  in mptcp_token_new_connect()
160 		 sk, subflow->local_key, subflow->token, subflow->idsn);  in mptcp_token_new_connect()
163 	mptcp_crypto_key_gen_sha(&subflow->local_key, &subflow->token,  in mptcp_token_new_connect()
166 	bucket = token_bucket(subflow->token);  in mptcp_token_new_connect()
168 	if (__token_bucket_busy(bucket, subflow->token)) {  in mptcp_token_new_connect()
175 	WRITE_ONCE(msk->token, subflow->token);  in mptcp_token_new_connect()
183  * mptcp_token_accept - replace a req sk with full sock in token hash
196 	bucket = token_bucket(req->token);  in mptcp_token_accept()
199 	/* pedantic lookup check for the moved token */  in mptcp_token_accept()
200 	pos = __token_lookup_req(bucket, req->token);  in mptcp_token_accept()
207 bool mptcp_token_exists(u32 token)  in mptcp_token_exists()  argument
215 	bucket = token_bucket(token);  in mptcp_token_exists()
220 		if (READ_ONCE(msk->token) == token)  in mptcp_token_exists()
223 	if (get_nulls_value(pos) != (token & token_mask))  in mptcp_token_exists()
234  * 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(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()
259 		if (READ_ONCE(msk->token) != token) {  in mptcp_token_get_sock()
265 	if (get_nulls_value(pos) != (token & token_mask))  in mptcp_token_get_sock()
278  * mptcp_token_iter_next - iterate over the token container from given pos
284  * token container starting from the specified position, or NULL.
337  * mptcp_token_destroy_request - remove mptcp connection/token
338  * @req: mptcp request socket dropping the token
340  * Remove the token associated to @req.
351 	bucket = token_bucket(subflow_req->token);  in mptcp_token_destroy_request()
353 	pos = __token_lookup_req(bucket, subflow_req->token);  in mptcp_token_destroy_request()
362  * mptcp_token_destroy - remove mptcp connection/token
363  * @msk: mptcp connection dropping the token
365  * Remove the token associated to @msk
375 	bucket = token_bucket(msk->token);  in mptcp_token_destroy()
377 	pos = __token_lookup_msk(bucket, msk->token);  in mptcp_token_destroy()
389 	token_hash = alloc_large_system_hash("MPTCP token",  in mptcp_token_init()