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Commit 1a308118 authored by J. Bruce Fields's avatar J. Bruce Fields
Browse files

nfsd4: allow an EXCHANGE_ID to kill a 4.0 client 



Following rfc 5661 section 2.4.1, we can permit a 4.1 client to remove
an established 4.0 client's state.

(But we don't allow updates.)

Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent ea236d07

fs/nfsd/nfs4state.c

+8 −2
Original line number Diff line number Diff line
@@ -1553,9 +1553,11 @@ nfsd4_exchange_id(struct svc_rqst *rqstp, 
	conf = find_confirmed_client_by_str(dname, strhashval);

	if (conf) {

		if (!clp_used_exchangeid(conf)) {

			status = nfserr_clid_inuse; /* XXX: ? */

			if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {

				status = nfserr_inval; /* buggy client */

				goto out;

			}

		}

		if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {

			/* 18.35.4 case 9 */

			if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A)
@@ -1574,6 +1576,10 @@ nfsd4_exchange_id(struct svc_rqst *rqstp, 
			expire_client(conf);

			goto out_new;

		}

		if (!clp_used_exchangeid(conf)) {

			status = nfserr_inval;

			goto out;

		}

		/*

		 * Set bit when the owner id and verifier map to an already

		 * confirmed client id (18.35.3).