nfsd41: exchange_id operation
Implement the exchange_id operation confoming to http://tools.ietf.org/html/draft-ietf-nfsv4-minorversion1-28 Based on the client provided name, hash a client id. If a confirmed one is found, compare the op's creds and verifier. If the creds match and the verifier is different then expire the old client (client re-incarnated), otherwise, if both match, assume it's a replay and ignore it. If an unconfirmed client is found, then copy the new creds and verifer if need update, otherwise assume replay. The client is moved to a confirmed state on create_session. In the nfs41 branch set the exchange_id flags to EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_SUPP_MOVED_REFER (pNFS is not supported, Referrals are supported, Migration is not.). Address various scenarios from section 18.35 of the spec: 1. Check for EXCHGID4_FLAG_UPD_CONFIRMED_REC_A and set EXCHGID4_FLAG_CONFIRMED_R as appropriate. 2. Return error codes per 18.35.4 scenarios. 3. Update client records or generate new client ids depending on scenario. Note: 18.35.4 case 3 probably still needs revisiting. The handling seems not quite right. Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Andy Adamosn <andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> [nfsd41: use utsname for major_id (and copy to server_scope)] [nfsd41: fix handling of various exchange id scenarios] Signed-off-by: Mike Sager <sager@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> [nfsd41: reverse use of EXCHGID4_INVAL_FLAG_MASK_A] [simplify nfsd4_encode_exchange_id error handling] [nfsd41: embed an xdr_netobj in nfsd4_exchange_id] [nfsd41: return nfserr_serverfault for spa_how == SP4_MACH_CRED] Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Andy Adamson
J. Bruce Fields
parent
069b6ad4bb
commit
0733d21338
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@ -832,12 +832,152 @@ out_err:
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return;
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}
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/*
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* Set the exchange_id flags returned by the server.
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*/
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static void
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nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
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{
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/* pNFS is not supported */
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new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
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/* Referrals are supported, Migration is not. */
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new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
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/* set the wire flags to return to client. */
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clid->flags = new->cl_exchange_flags;
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}
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__be32
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nfsd4_exchange_id(struct svc_rqst *rqstp,
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struct nfsd4_compound_state *cstate,
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struct nfsd4_exchange_id *exid)
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{
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return -1; /* stub */
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struct nfs4_client *unconf, *conf, *new;
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int status;
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unsigned int strhashval;
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char dname[HEXDIR_LEN];
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nfs4_verifier verf = exid->verifier;
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u32 ip_addr = svc_addr_in(rqstp)->sin_addr.s_addr;
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dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
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" ip_addr=%u flags %x, spa_how %d\n",
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__func__, rqstp, exid, exid->clname.len, exid->clname.data,
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ip_addr, exid->flags, exid->spa_how);
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if (!check_name(exid->clname) || (exid->flags & ~EXCHGID4_FLAG_MASK_A))
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return nfserr_inval;
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/* Currently only support SP4_NONE */
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switch (exid->spa_how) {
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case SP4_NONE:
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break;
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case SP4_SSV:
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return nfserr_encr_alg_unsupp;
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default:
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BUG(); /* checked by xdr code */
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case SP4_MACH_CRED:
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return nfserr_serverfault; /* no excuse :-/ */
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}
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status = nfs4_make_rec_clidname(dname, &exid->clname);
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if (status)
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goto error;
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strhashval = clientstr_hashval(dname);
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nfs4_lock_state();
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status = nfs_ok;
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conf = find_confirmed_client_by_str(dname, strhashval);
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if (conf) {
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if (!same_verf(&verf, &conf->cl_verifier)) {
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/* 18.35.4 case 8 */
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if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
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status = nfserr_not_same;
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goto out;
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}
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/* Client reboot: destroy old state */
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expire_client(conf);
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goto out_new;
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}
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if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
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/* 18.35.4 case 9 */
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if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
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status = nfserr_perm;
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goto out;
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}
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expire_client(conf);
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goto out_new;
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}
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if (ip_addr != conf->cl_addr &&
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!(exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A)) {
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/* Client collision. 18.35.4 case 3 */
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status = nfserr_clid_inuse;
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goto out;
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}
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/*
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* Set bit when the owner id and verifier map to an already
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* confirmed client id (18.35.3).
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*/
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exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
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/*
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* Falling into 18.35.4 case 2, possible router replay.
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* Leave confirmed record intact and return same result.
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*/
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copy_verf(conf, &verf);
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new = conf;
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goto out_copy;
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} else {
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/* 18.35.4 case 7 */
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if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
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status = nfserr_noent;
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goto out;
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}
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}
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unconf = find_unconfirmed_client_by_str(dname, strhashval);
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if (unconf) {
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/*
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* Possible retry or client restart. Per 18.35.4 case 4,
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* a new unconfirmed record should be generated regardless
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* of whether any properties have changed.
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*/
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expire_client(unconf);
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}
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out_new:
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/* Normal case */
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new = create_client(exid->clname, dname);
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if (new == NULL) {
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status = nfserr_resource;
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goto out;
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}
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copy_verf(new, &verf);
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copy_cred(&new->cl_cred, &rqstp->rq_cred);
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new->cl_addr = ip_addr;
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gen_clid(new);
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gen_confirm(new);
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add_to_unconfirmed(new, strhashval);
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out_copy:
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exid->clientid.cl_boot = new->cl_clientid.cl_boot;
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exid->clientid.cl_id = new->cl_clientid.cl_id;
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new->cl_seqid = exid->seqid = 1;
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nfsd4_set_ex_flags(new, exid);
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dprintk("nfsd4_exchange_id seqid %d flags %x\n",
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new->cl_seqid, new->cl_exchange_flags);
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status = nfs_ok;
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out:
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nfs4_unlock_state();
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error:
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dprintk("nfsd4_exchange_id returns %d\n", ntohl(status));
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return status;
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}
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__be32
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@ -45,6 +45,7 @@
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#include <linux/fs.h>
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#include <linux/namei.h>
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#include <linux/vfs.h>
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#include <linux/utsname.h>
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#include <linux/sunrpc/xdr.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/sunrpc/clnt.h>
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@ -998,9 +999,100 @@ nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_rel
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static __be32
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nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
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struct nfsd4_exchange_id *clid)
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struct nfsd4_exchange_id *exid)
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{
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return nfserr_opnotsupp; /* stub */
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int dummy;
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DECODE_HEAD;
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READ_BUF(NFS4_VERIFIER_SIZE);
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COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
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READ_BUF(4);
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READ32(exid->clname.len);
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READ_BUF(exid->clname.len);
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SAVEMEM(exid->clname.data, exid->clname.len);
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READ_BUF(4);
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READ32(exid->flags);
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/* Ignore state_protect4_a */
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READ_BUF(4);
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READ32(exid->spa_how);
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switch (exid->spa_how) {
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case SP4_NONE:
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break;
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case SP4_MACH_CRED:
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/* spo_must_enforce */
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READ_BUF(4);
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READ32(dummy);
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READ_BUF(dummy * 4);
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p += dummy;
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/* spo_must_allow */
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READ_BUF(4);
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READ32(dummy);
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READ_BUF(dummy * 4);
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p += dummy;
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break;
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case SP4_SSV:
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/* ssp_ops */
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READ_BUF(4);
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READ32(dummy);
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READ_BUF(dummy * 4);
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p += dummy;
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READ_BUF(4);
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READ32(dummy);
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READ_BUF(dummy * 4);
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p += dummy;
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/* ssp_hash_algs<> */
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READ_BUF(4);
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READ32(dummy);
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READ_BUF(dummy);
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p += XDR_QUADLEN(dummy);
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/* ssp_encr_algs<> */
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READ_BUF(4);
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READ32(dummy);
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READ_BUF(dummy);
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p += XDR_QUADLEN(dummy);
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/* ssp_window and ssp_num_gss_handles */
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READ_BUF(8);
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READ32(dummy);
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READ32(dummy);
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break;
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default:
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goto xdr_error;
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}
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/* Ignore Implementation ID */
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READ_BUF(4); /* nfs_impl_id4 array length */
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READ32(dummy);
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if (dummy > 1)
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goto xdr_error;
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if (dummy == 1) {
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/* nii_domain */
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READ_BUF(4);
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READ32(dummy);
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READ_BUF(dummy);
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p += XDR_QUADLEN(dummy);
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/* nii_name */
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READ_BUF(4);
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READ32(dummy);
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READ_BUF(dummy);
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p += XDR_QUADLEN(dummy);
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/* nii_date */
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READ_BUF(12);
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p += 3;
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}
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DECODE_TAIL;
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}
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static __be32
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@ -2665,8 +2757,55 @@ static __be32
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nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
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struct nfsd4_exchange_id *exid)
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{
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/* stub */
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return nfserr;
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ENCODE_HEAD;
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char *major_id;
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char *server_scope;
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int major_id_sz;
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int server_scope_sz;
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uint64_t minor_id = 0;
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if (nfserr)
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return nfserr;
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major_id = utsname()->nodename;
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major_id_sz = strlen(major_id);
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server_scope = utsname()->nodename;
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server_scope_sz = strlen(server_scope);
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RESERVE_SPACE(
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8 /* eir_clientid */ +
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4 /* eir_sequenceid */ +
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4 /* eir_flags */ +
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4 /* spr_how (SP4_NONE) */ +
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8 /* so_minor_id */ +
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4 /* so_major_id.len */ +
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(XDR_QUADLEN(major_id_sz) * 4) +
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4 /* eir_server_scope.len */ +
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(XDR_QUADLEN(server_scope_sz) * 4) +
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4 /* eir_server_impl_id.count (0) */);
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WRITEMEM(&exid->clientid, 8);
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WRITE32(exid->seqid);
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WRITE32(exid->flags);
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/* state_protect4_r. Currently only support SP4_NONE */
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BUG_ON(exid->spa_how != SP4_NONE);
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WRITE32(exid->spa_how);
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/* The server_owner struct */
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WRITE64(minor_id); /* Minor id */
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/* major id */
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WRITE32(major_id_sz);
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WRITEMEM(major_id, major_id_sz);
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/* Server scope */
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WRITE32(server_scope_sz);
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WRITEMEM(server_scope, server_scope_sz);
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/* Implementation id */
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WRITE32(0); /* zero length nfs_impl_id4 array */
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ADJUST_ARGS();
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return 0;
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}
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static __be32
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@ -173,6 +173,8 @@ struct nfs4_client {
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/* for nfs41 */
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struct list_head cl_sessions;
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u32 cl_seqid; /* seqid for create_session */
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u32 cl_exchange_flags;
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};
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/* struct nfs4_client_reset
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@ -345,7 +345,12 @@ struct nfsd4_write {
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};
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struct nfsd4_exchange_id {
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int foo; /* stub */
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nfs4_verifier verifier;
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struct xdr_netobj clname;
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u32 flags;
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clientid_t clientid;
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u32 seqid;
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int spa_how;
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};
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struct nfsd4_create_session {
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