diff options
Diffstat (limited to 'fs/nfsd/nfs4proc.c')
| -rw-r--r-- | fs/nfsd/nfs4proc.c | 40 |
1 files changed, 32 insertions, 8 deletions
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index f7be7fabe62c..ec51936d2ce2 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -811,14 +811,15 @@ static inline void nfsd4_increment_op_stats(u32 opnum) typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *, void *); +enum nfsd4_op_flags { + ALLOWED_WITHOUT_FH = 1 << 0, /* No current filehandle required */ + ALLOWED_ON_ABSENT_FS = 2 << 0, /* ops processed on absent fs */ + ALLOWED_AS_FIRST_OP = 3 << 0, /* ops reqired first in compound */ +}; struct nfsd4_operation { nfsd4op_func op_func; u32 op_flags; -/* Most ops require a valid current filehandle; a few don't: */ -#define ALLOWED_WITHOUT_FH 1 -/* GETATTR and ops not listed as returning NFS4ERR_MOVED: */ -#define ALLOWED_ON_ABSENT_FS 2 char *op_name; }; @@ -827,6 +828,23 @@ static struct nfsd4_operation nfsd4_ops[]; static const char *nfsd4_op_name(unsigned opnum); /* + * Enforce NFSv4.1 COMPOUND ordering rules. + * + * TODO: + * - enforce NFS4ERR_NOT_ONLY_OP, + * - DESTROY_SESSION MUST be the final operation in the COMPOUND request. + */ +static bool nfs41_op_ordering_ok(struct nfsd4_compoundargs *args) +{ + if (args->minorversion && args->opcnt > 0) { + struct nfsd4_op *op = &args->ops[0]; + return (op->status == nfserr_op_illegal) || + (nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP); + } + return true; +} + +/* * COMPOUND call. */ static __be32 @@ -864,6 +882,12 @@ nfsd4_proc_compound(struct svc_rqst *rqstp, if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION) goto out; + if (!nfs41_op_ordering_ok(args)) { + op = &args->ops[0]; + op->status = nfserr_sequence_pos; + goto encode_op; + } + status = nfs_ok; while (!status && resp->opcnt < args->opcnt) { op = &args->ops[resp->opcnt++]; @@ -1105,22 +1129,22 @@ static struct nfsd4_operation nfsd4_ops[] = { /* NFSv4.1 operations */ [OP_EXCHANGE_ID] = { .op_func = (nfsd4op_func)nfsd4_exchange_id, - .op_flags = ALLOWED_WITHOUT_FH, + .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP, .op_name = "OP_EXCHANGE_ID", }, [OP_CREATE_SESSION] = { .op_func = (nfsd4op_func)nfsd4_create_session, - .op_flags = ALLOWED_WITHOUT_FH, + .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP, .op_name = "OP_CREATE_SESSION", }, [OP_DESTROY_SESSION] = { .op_func = (nfsd4op_func)nfsd4_destroy_session, - .op_flags = ALLOWED_WITHOUT_FH, + .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP, .op_name = "OP_DESTROY_SESSION", }, [OP_SEQUENCE] = { .op_func = (nfsd4op_func)nfsd4_sequence, - .op_flags = ALLOWED_WITHOUT_FH, + .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP, .op_name = "OP_SEQUENCE", }, }; |