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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2007-10-04 14:39:22 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-10 16:54:31 -0700
commit7c559a9e44ee61faf2f339604ce708decb345a93 (patch)
tree8e0e89521445a42cf801747af20be172b6e9e582 /Documentation
parent[DCCP]: Wait for CCID (diff)
downloadlinux-dev-7c559a9e44ee61faf2f339604ce708decb345a93.tar.xz
linux-dev-7c559a9e44ee61faf2f339604ce708decb345a93.zip
[DCCP]: Add socket option to query the current MPS
This enables applications to query the current value of the Maximum Packet Size via a socket option, suggested as a SHOULD in (RFC 4340, p. 102). This socket option is useful to avoid the annoying bail-out via `-EMSGSIZE'. In particular, as fragmentation is not currently supported (and its use is partly discouraged in RFC 4340). With this option, it is possible to size buffers accordingly, e.g. int buflen = dccp_get_cur_mps(sockfd); /* or */ if (msgsize > dccp_get_cur_mps(sockfd)) die("message is too large for this path"); Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/networking/dccp.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/networking/dccp.txt b/Documentation/networking/dccp.txt
index 477026ae0ffb..f9157180f7d8 100644
--- a/Documentation/networking/dccp.txt
+++ b/Documentation/networking/dccp.txt
@@ -41,6 +41,9 @@ the socket will fall back to 0 (which means that no meaningful service code
is present). Connecting sockets set at most one service option; for
listening sockets, multiple service codes can be specified.
+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_SEND_CSCOV and DCCP_SOCKOPT_RECV_CSCOV are used for setting the
partial checksum coverage (RFC 4340, sec. 9.2). The default is that checksums
always cover the entire packet and that only fully covered application data is