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| author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2010-02-07 23:20:28 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-02-12 22:47:00 +0300 |
| commit | 69a6a0b38a139ccceef32222108caca8a9b0b795 (patch) | |
| tree | 04e24f2b012c14f33f5bc3d6f96f84056cf1fbbe /Documentation/networking/dccp.txt | |
| parent | 7455a76f170f794498d26081a5f15b797ef1a2aa (diff) | |
| download | linux-69a6a0b38a139ccceef32222108caca8a9b0b795.tar.xz | |
dccp: allow probing of CCID-array length
This fixes a problem in the DCCP getsockopt() API: currently there is no way
for a user to a priori know the number of built-in CCIDs, other than trying
DCCP_SOCKOPT_AVAILABLE_CCIDS in a loop, incrementing the option length until
EINVAL is no longer returned.
This patch truncates the array to the user-provided length. No copy is made
when the length is <= 0.
Due to the length restriction in do_dccp_getsockopt() to sizeof(int), the
minimum array length remains 4, which is a reasonable default (only 3
CCIDs, CCID-2..4, are currently defined).
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking/dccp.txt')
| -rw-r--r-- | Documentation/networking/dccp.txt | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/Documentation/networking/dccp.txt b/Documentation/networking/dccp.txt index b132e4a3cf0f..a62fdf7a6bff 100644 --- a/Documentation/networking/dccp.txt +++ b/Documentation/networking/dccp.txt @@ -58,8 +58,10 @@ 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. +supported by the endpoint. The option value is an array of type uint8_t whose +size is passed as option length. The minimum array size is 4 elements, the +value returned in the optlen argument always reflects the true number of +built-in CCIDs. 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 |