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NFSD: Add a separate decoder for ssv_sp_parms

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Refactor for clarity.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2020-11-03 11:17:50 -05:00
parent 2548aa784d
commit 547bfeb4cd
1 changed files with 44 additions and 26 deletions
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70
fs/nfsd/nfs4xdr.c
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@ -1488,12 +1488,54 @@ nfsd4_decode_state_protect_ops(struct nfsd4_compoundargs *argp,
return nfs_ok;
}
/*
* This implementation currently does not support SP4_SSV.
* This decoder simply skips over these arguments.
*/
static noinline __be32
nfsd4_decode_ssv_sp_parms(struct nfsd4_compoundargs *argp,
struct nfsd4_exchange_id *exid)
{
u32 count, window, num_gss_handles;
__be32 status;
/* ssp_ops */
status = nfsd4_decode_state_protect_ops(argp, exid);
if (status)
return status;
/* ssp_hash_algs<> */
if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
return nfserr_bad_xdr;
while (count--) {
status = nfsd4_decode_ignored_string(argp, 0);
if (status)
return status;
}
/* ssp_encr_algs<> */
if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
return nfserr_bad_xdr;
while (count--) {
status = nfsd4_decode_ignored_string(argp, 0);
if (status)
return status;
}
if (xdr_stream_decode_u32(argp->xdr, &window) < 0)
return nfserr_bad_xdr;
if (xdr_stream_decode_u32(argp->xdr, &num_gss_handles) < 0)
return nfserr_bad_xdr;
return nfs_ok;
}
static __be32
nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
struct nfsd4_exchange_id *exid)
{
int dummy, tmp;
DECODE_HEAD;
int dummy;
READ_BUF(NFS4_VERIFIER_SIZE);
COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
@ -1517,33 +1559,9 @@ nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
return status;
break;
case SP4_SSV:
/* ssp_ops */
status = nfsd4_decode_state_protect_ops(argp, exid);
status = nfsd4_decode_ssv_sp_parms(argp, exid);
if (status)
return status;
/* ssp_hash_algs<> */
READ_BUF(4);
tmp = be32_to_cpup(p++);
while (tmp--) {
READ_BUF(4);
dummy = be32_to_cpup(p++);
READ_BUF(dummy);
p += XDR_QUADLEN(dummy);
}
/* ssp_encr_algs<> */
READ_BUF(4);
tmp = be32_to_cpup(p++);
while (tmp--) {
READ_BUF(4);
dummy = be32_to_cpup(p++);
READ_BUF(dummy);
p += XDR_QUADLEN(dummy);
}
/* ignore ssp_window and ssp_num_gss_handles: */
READ_BUF(8);
break;
default:
goto xdr_error;