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nfsd: Pre-parse the next NFSv4 operation number for put FH operations

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RFC5661 Sec. 2.6 specifies when a NFSERR_WRONGSEC error reply can be done.
For the four operations PutFH, PutrootFH, PutpublicFH and RestoreFH,
NFSERR_WRONGSEC can or cannot be replied, depending upon what operation
follows one of these operations in the compound.

This patch modifies nfsrvd_compound() so that it parses the next operation
number before executing any of the above four operations, storing it in
"nextop".

A future commit will implement use of "nextop" to decide if NFSERR_WRONGSEC
can be replied for the above four operations.

This commit should not change the semantics of performing the compound RPC.

MFC after:	2 weeks
This commit is contained in:
Rick Macklem 2021-06-03 20:48:26 -07:00
parent f9b1e711f0
commit d224f05fcf
1 changed files with 100 additions and 9 deletions
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109
sys/fs/nfsserver/nfs_nfsdsocket.c
View File

@ -705,7 +705,7 @@ nfsrvd_compound(struct nfsrv_descript *nd, int isdgram, u_char *tag,
int i, lktype, op, op0 = 0, statsinprog = 0;
u_int32_t *tl;
struct nfsclient *clp, *nclp;
int numops, error = 0, igotlock;
int error = 0, igotlock, nextop, numops, savefhcnt;
u_int32_t retops = 0, *retopsp = NULL, *repp;
vnode_t vp, nvp, savevp;
struct nfsrvfh fh;
@ -822,6 +822,8 @@ nfsrvd_compound(struct nfsrv_descript *nd, int isdgram, u_char *tag,
savevp = vp = NULL;
save_fsid.val[0] = save_fsid.val[1] = 0;
cur_fsid.val[0] = cur_fsid.val[1] = 0;
nextop = -1;
savefhcnt = 0;
/* If taglen < 0, there was a parsing error in nfsd_getminorvers(). */
if (taglen < 0) {
@ -850,10 +852,20 @@ nfsrvd_compound(struct nfsrv_descript *nd, int isdgram, u_char *tag,
* savevpnes and vpnes - are the export flags for the above.
*/
for (i = 0; i < numops; i++) {
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
NFSM_BUILD(repp, u_int32_t *, 2 * NFSX_UNSIGNED);
*repp = *tl;
op = fxdr_unsigned(int, *tl);
if (savefhcnt > 0) {
op = NFSV4OP_SAVEFH;
*repp = txdr_unsigned(op);
savefhcnt--;
} else if (nextop == -1) {
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
*repp = *tl;
op = fxdr_unsigned(int, *tl);
} else {
op = nextop;
*repp = txdr_unsigned(op);
nextop = -1;
}
NFSD_DEBUG(4, "op=%d\n", op);
if (op < NFSV4OP_ACCESS || op >= NFSV42_NOPS ||
(op >= NFSV4OP_NOPS && (nd->nd_flag & ND_NFSV41) == 0) ||
@ -950,6 +962,25 @@ nfsrvd_compound(struct nfsrv_descript *nd, int isdgram, u_char *tag,
error = nfsrv_mtofh(nd, &fh);
if (error)
goto nfsmout;
if ((nd->nd_flag & ND_LASTOP) == 0) {
/*
* Pre-parse the next op#. If it is
* SaveFH, count it and skip to the
* next op#, if not the last op#.
* nextop is used to determine if
* NFSERR_WRONGSEC can be returned,
* per RFC5661 Sec. 2.6.
*/
do {
NFSM_DISSECT(tl, uint32_t *,
NFSX_UNSIGNED);
nextop = fxdr_unsigned(int, *tl);
if (nextop == NFSV4OP_SAVEFH &&
i < numops - 1)
savefhcnt++;
} while (nextop == NFSV4OP_SAVEFH &&
i < numops - 1);
}
if (!nd->nd_repstat)
nfsd_fhtovp(nd, &fh, LK_SHARED, &nvp, &nes,
NULL, 0);
@ -964,11 +995,31 @@ nfsrvd_compound(struct nfsrv_descript *nd, int isdgram, u_char *tag,
}
break;
case NFSV4OP_PUTPUBFH:
if (nfs_pubfhset)
nfsd_fhtovp(nd, &nfs_pubfh, LK_SHARED, &nvp,
&nes, NULL, 0);
else
nd->nd_repstat = NFSERR_NOFILEHANDLE;
if (nfs_pubfhset) {
if ((nd->nd_flag & ND_LASTOP) == 0) {
/*
* Pre-parse the next op#. If it is
* SaveFH, count it and skip to the
* next op#, if not the last op#.
* nextop is used to determine if
* NFSERR_WRONGSEC can be returned,
* per RFC5661 Sec. 2.6.
*/
do {
NFSM_DISSECT(tl, uint32_t *,
NFSX_UNSIGNED);
nextop = fxdr_unsigned(int,
*tl);
if (nextop == NFSV4OP_SAVEFH &&
i < numops - 1)
savefhcnt++;
} while (nextop == NFSV4OP_SAVEFH &&
i < numops - 1);
}
nfsd_fhtovp(nd, &nfs_pubfh, LK_SHARED, &nvp,
&nes, NULL, 0);
} else
nd->nd_repstat = NFSERR_NOFILEHANDLE;
if (!nd->nd_repstat) {
if (vp)
vrele(vp);
@ -980,6 +1031,26 @@ nfsrvd_compound(struct nfsrv_descript *nd, int isdgram, u_char *tag,
break;
case NFSV4OP_PUTROOTFH:
if (nfs_rootfhset) {
if ((nd->nd_flag & ND_LASTOP) == 0) {
/*
* Pre-parse the next op#. If it is
* SaveFH, count it and skip to the
* next op#, if not the last op#.
* nextop is used to determine if
* NFSERR_WRONGSEC can be returned,
* per RFC5661 Sec. 2.6.
*/
do {
NFSM_DISSECT(tl, uint32_t *,
NFSX_UNSIGNED);
nextop = fxdr_unsigned(int,
*tl);
if (nextop == NFSV4OP_SAVEFH &&
i < numops - 1)
savefhcnt++;
} while (nextop == NFSV4OP_SAVEFH &&
i < numops - 1);
}
nfsd_fhtovp(nd, &nfs_rootfh, LK_SHARED, &nvp,
&nes, NULL, 0);
if (!nd->nd_repstat) {
@ -1016,6 +1087,26 @@ nfsrvd_compound(struct nfsrv_descript *nd, int isdgram, u_char *tag,
break;
case NFSV4OP_RESTOREFH:
if (savevp) {
if ((nd->nd_flag & ND_LASTOP) == 0) {
/*
* Pre-parse the next op#. If it is
* SaveFH, count it and skip to the
* next op#, if not the last op#.
* nextop is used to determine if
* NFSERR_WRONGSEC can be returned,
* per RFC5661 Sec. 2.6.
*/
do {
NFSM_DISSECT(tl, uint32_t *,
NFSX_UNSIGNED);
nextop = fxdr_unsigned(int,
*tl);
if (nextop == NFSV4OP_SAVEFH &&
i < numops - 1)
savefhcnt++;
} while (nextop == NFSV4OP_SAVEFH &&
i < numops - 1);
}
nd->nd_repstat = 0;
/* If vp == savevp, a no-op */
if (vp != savevp) {