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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2008-11-23 19:02:31 -0500
committerDavid S. Miller <davem@davemloft.net>2008-11-23 19:02:31 -0500
commitb20a9c24d5c5d466d7e4a25c6f1bedbd2d16ad4f (patch)
tree17789215657f693caf36e22d3e724cc1b1e07ba6 /Documentation/networking
parent2c62ad7b56fa8e2658253c0256ef4c4de228a0b9 (diff)
dccp: Set per-connection CCIDs via socket options
With this patch, TX/RX CCIDs can now be changed on a per-connection basis, which overrides the defaults set by the global sysctl variables for TX/RX CCIDs. To make full use of this facility, the remaining patches of this patch set are needed, which track dependencies and activate negotiated feature values. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking')
-rw-r--r--Documentation/networking/dccp.txt14
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/networking/dccp.txt b/Documentation/networking/dccp.txt
index 43df4487379b..610083ff73f6 100644
--- a/Documentation/networking/dccp.txt
+++ b/Documentation/networking/dccp.txt
@@ -61,6 +61,20 @@ DCCP_SOCKOPT_AVAILABLE_CCIDS is also read-only and returns the list of CCIDs
61supported by the endpoint (see include/linux/dccp.h for symbolic constants). 61supported by the endpoint (see include/linux/dccp.h for symbolic constants).
62The caller needs to provide a sufficiently large (> 2) array of type uint8_t. 62The caller needs to provide a sufficiently large (> 2) array of type uint8_t.
63 63
64DCCP_SOCKOPT_CCID is write-only and sets both the TX and RX CCIDs at the same
65time, combining the operation of the next two socket options. This option is
66preferrable over the latter two, since often applications will use the same
67type of CCID for both directions; and mixed use of CCIDs is not currently well
68understood. This socket option takes as argument at least one uint8_t value, or
69an array of uint8_t values, which must match available CCIDS (see above). CCIDs
70must be registered on the socket before calling connect() or listen().
71
72DCCP_SOCKOPT_TX_CCID is read/write. It returns the current CCID (if set) or sets
73the preference list for the TX CCID, using the same format as DCCP_SOCKOPT_CCID.
74Please note that the getsockopt argument type here is `int', not uint8_t.
75
76DCCP_SOCKOPT_RX_CCID is analogous to DCCP_SOCKOPT_TX_CCID, but for the RX CCID.
77
64DCCP_SOCKOPT_SERVER_TIMEWAIT enables the server (listening socket) to hold 78DCCP_SOCKOPT_SERVER_TIMEWAIT enables the server (listening socket) to hold
65timewait state when closing the connection (RFC 4340, 8.3). The usual case is 79timewait state when closing the connection (RFC 4340, 8.3). The usual case is
66that the closing server sends a CloseReq, whereupon the client holds timewait 80that the closing server sends a CloseReq, whereupon the client holds timewait