Gerrit Renker 7c559a9e44
[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 >
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