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| author | Jeff Layton <jlayton@redhat.com> | 2017-02-24 13:25:24 -0500 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2017-02-24 17:03:34 -0500 |
| commit | 5283b03ee5cd28d516646298bead09b238d92ddc (patch) | |
| tree | c2d955f18bd4390a4e52347052a2b3a7be745def /fs/nfs | |
| parent | 362142b25843fb059941aaa01b91501d5d8652cc (diff) | |
| download | linux-5283b03ee5cd28d516646298bead09b238d92ddc.tar.bz2 | |
nfs/nfsd/sunrpc: enforce transport requirements for NFSv4
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>
Diffstat (limited to 'fs/nfs')
| -rw-r--r-- | fs/nfs/callback_xdr.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/nfs/callback_xdr.c b/fs/nfs/callback_xdr.c index e9836f611d9c..fd0284c1dc32 100644 --- a/fs/nfs/callback_xdr.c +++ b/fs/nfs/callback_xdr.c @@ -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, }; |