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nfsd41: error out when client sets maxreq_sz or maxresp_sz too small

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According to RFC5661, 18.36.3,

 "if the client selects a value for ca_maxresponsesize such that
  a replier on a channel could never send a response,the server
  SHOULD return NFS4ERR_TOOSMALL in the CREATE_SESSION reply."

So, error out when the client sets a maxreq_sz less than the minimum
possible SEQUENCE request size, or sets a maxresp_sz less than the
minimum possible SEQUENCE reply size.

Signed-off-by: Mi Jinlong <mijinlong@cn.fujitsu.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Mi Jinlong 2011-07-14 14:50:17 +08:00 committed by J. Bruce Fields
parent f197c27196
commit 1b74c25bc1
1 changed files with 27 additions and 0 deletions
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27
fs/nfsd/nfs4state.c
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@ -1506,6 +1506,29 @@ nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
return slot->sl_status;
}
#define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1 + /* MIN tag is length with zero, only length */ \
3 + /* version, opcount, opcode */ \
XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
/* seqid, slotID, slotID, cache */ \
4 ) * sizeof(__be32))
#define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
2 + /* verifier: AUTH_NULL, length 0 */\
1 + /* status */ \
1 + /* MIN tag is length with zero, only length */ \
3 + /* opcount, opcode, opstatus*/ \
XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
/* seqid, slotID, slotID, slotID, status */ \
5 ) * sizeof(__be32))
static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs fchannel)
{
return fchannel.maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ
|| fchannel.maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ;
}
__be32
nfsd4_create_session(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
@ -1574,6 +1597,10 @@ nfsd4_create_session(struct svc_rqst *rqstp,
cr_ses->flags &= ~SESSION4_PERSIST;
cr_ses->flags &= ~SESSION4_RDMA;
status = nfserr_toosmall;
if (check_forechannel_attrs(cr_ses->fore_channel))
goto out;
status = nfserr_jukebox;
new = alloc_init_session(rqstp, conf, cr_ses);
if (!new)