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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 /include
parentbc8498721dfe3f7d537f4f75302be7dbe9c7b939 (diff)
[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 'include')
-rw-r--r--include/linux/dccp.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/dccp.h b/include/linux/dccp.h
index 4ed82e2c9f6..0e44a3e5208 100644
--- a/include/linux/dccp.h
+++ b/include/linux/dccp.h
@@ -202,6 +202,7 @@ struct dccp_so_feat {
#define DCCP_SOCKOPT_SERVICE 2
#define DCCP_SOCKOPT_CHANGE_L 3
#define DCCP_SOCKOPT_CHANGE_R 4
+#define DCCP_SOCKOPT_GET_CUR_MPS 5
#define DCCP_SOCKOPT_SEND_CSCOV 10
#define DCCP_SOCKOPT_RECV_CSCOV 11
#define DCCP_SOCKOPT_CCID_RX_INFO 128