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nfs/nfsd/sunrpc: enforce transport requirements for NFSv4

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NFSv4 requires a transport "that is specified to avoid network
congestion" (RFC 7530, section 3.1, paragraph 2).  In practical terms,
that means that you should not run NFSv4 over UDP. The server has never
enforced that requirement, however.

This patchset fixes this by adding a new flag to the svc_version that
states that it has these transport requirements. With that, we can check
that the transport has XPT_CONG_CTRL set before processing an RPC. If it
doesn't we reject it with RPC_PROG_MISMATCH.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2017-02-24 13:25:24 -05:00 • committed by J. Bruce Fields
parent 362142b258
commit 5283b03ee5
4 changed files with 27 additions and 6 deletions
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2
fs/nfs/callback_xdr.c
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@ -1084,6 +1084,7 @@ struct svc_version nfs4_callback_version1 = {
.vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
.vs_dispatch = NULL,
.vs_hidden = true,
.vs_need_cong_ctrl = true,
};
struct svc_version nfs4_callback_version4 = {
@ -1093,4 +1094,5 @@ struct svc_version nfs4_callback_version4 = {
.vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
.vs_dispatch = NULL,
.vs_hidden = true,
.vs_need_cong_ctrl = true,
};