diff options
Diffstat (limited to 'Documentation/networking/dccp.txt')
| -rw-r--r-- | Documentation/networking/dccp.txt | 54 |
1 files changed, 12 insertions, 42 deletions
diff --git a/Documentation/networking/dccp.txt b/Documentation/networking/dccp.txt index fcfc12534428..39131a3c78f8 100644 --- a/Documentation/networking/dccp.txt +++ b/Documentation/networking/dccp.txt @@ -45,25 +45,6 @@ http://linux-net.osdl.org/index.php/DCCP_Testing#Experimental_DCCP_source_tree Socket options ============== -DCCP_SOCKOPT_QPOLICY_ID sets the dequeuing policy for outgoing packets. It takes -a policy ID as argument and can only be set before the connection (i.e. changes -during an established connection are not supported). Currently, two policies are -defined: the "simple" policy (DCCPQ_POLICY_SIMPLE), which does nothing special, -and a priority-based variant (DCCPQ_POLICY_PRIO). The latter allows to pass an -u32 priority value as ancillary data to sendmsg(), where higher numbers indicate -a higher packet priority (similar to SO_PRIORITY). This ancillary data needs to -be formatted using a cmsg(3) message header filled in as follows: - cmsg->cmsg_level = SOL_DCCP; - cmsg->cmsg_type = DCCP_SCM_PRIORITY; - cmsg->cmsg_len = CMSG_LEN(sizeof(uint32_t)); /* or CMSG_LEN(4) */ - -DCCP_SOCKOPT_QPOLICY_TXQLEN sets the maximum length of the output queue. A zero -value is always interpreted as unbounded queue length. If different from zero, -the interpretation of this parameter depends on the current dequeuing policy -(see above): the "simple" policy will enforce a fixed queue size by returning -EAGAIN, whereas the "prio" policy enforces a fixed queue length by dropping the -lowest-priority packet first. The default value for this parameter is -initialised from /proc/sys/net/dccp/default/tx_qlen. DCCP_SOCKOPT_SERVICE sets the service. The specification mandates use of service codes (RFC 4340, sec. 8.1.2); if this socket option is not set, @@ -76,24 +57,6 @@ can be set before calling bind(). DCCP_SOCKOPT_GET_CUR_MPS is read-only and retrieves the current maximum packet size (application payload size) in bytes, see RFC 4340, section 14. -DCCP_SOCKOPT_AVAILABLE_CCIDS is also read-only and returns the list of CCIDs -supported by the endpoint (see include/linux/dccp.h for symbolic constants). -The caller needs to provide a sufficiently large (> 2) array of type uint8_t. - -DCCP_SOCKOPT_CCID is write-only and sets both the TX and RX CCIDs at the same -time, combining the operation of the next two socket options. This option is -preferrable over the latter two, since often applications will use the same -type of CCID for both directions; and mixed use of CCIDs is not currently well -understood. This socket option takes as argument at least one uint8_t value, or -an array of uint8_t values, which must match available CCIDS (see above). CCIDs -must be registered on the socket before calling connect() or listen(). - -DCCP_SOCKOPT_TX_CCID is read/write. It returns the current CCID (if set) or sets -the preference list for the TX CCID, using the same format as DCCP_SOCKOPT_CCID. -Please note that the getsockopt argument type here is `int', not uint8_t. - -DCCP_SOCKOPT_RX_CCID is analogous to DCCP_SOCKOPT_TX_CCID, but for the RX CCID. - DCCP_SOCKOPT_SERVER_TIMEWAIT enables the server (listening socket) to hold timewait state when closing the connection (RFC 4340, 8.3). The usual case is that the closing server sends a CloseReq, whereupon the client holds timewait @@ -152,16 +115,23 @@ retries2 importance for retransmitted acknowledgments and feature negotiation, data packets are never retransmitted. Analogue of tcp_retries2. +send_ndp = 1 + Whether or not to send NDP count options (sec. 7.7.2). + +send_ackvec = 1 + Whether or not to send Ack Vector options (sec. 11.5). + +ack_ratio = 2 + The default Ack Ratio (sec. 11.3) to use. + tx_ccid = 2 - Default CCID for the sender-receiver half-connection. Depending on the - choice of CCID, the Send Ack Vector feature is enabled automatically. + Default CCID for the sender-receiver half-connection. rx_ccid = 2 - Default CCID for the receiver-sender half-connection; see tx_ccid. + Default CCID for the receiver-sender half-connection. seq_window = 100 - The initial sequence window (sec. 7.5.2) of the sender. This influences - the local ackno validity and the remote seqno validity windows (7.5.1). + The initial sequence window (sec. 7.5.2). tx_qlen = 5 The size of the transmit buffer in packets. A value of 0 corresponds |