NFSv4.1 OP_EXCHANGE_ID response from server may contain server
implementation details (domain, name and build time) in optional
nfs_impl_id4 field. Currently nfsd does not fill this field.
Send these information in NFSv4.1 OP_EXCHANGE_ID response. Fill them with
the same values as what is Linux NFSv4.1 client doing. Domain is hardcoded
to "kernel.org", name is composed in the same way as "uname -srvm" output
and build time is hardcoded to zeros.
NFSv4.1 client and server implementation fields are useful for statistic
purposes or for identifying type of clients and servers.
Signed-off-by: Pali Rohár <pali@xxxxxxxxxx>
---
Changes in v2:
* Prepare string arguments in nfsd4_exchange_id() instead of in nfsd4_encode_server_impl_id()
* Use nfsd4_encode_*() functions for encoding instead of raw encoders
* Rename nfsd4_encode_nfs_impl_id4() to nfsd4_encode_server_impl_id()
* Remove Kconfig build option for nii_domain
* Remove runtime module option send_implementation_id
---
fs/nfsd/nfs4proc.c | 1 +
fs/nfsd/nfs4state.c | 28 ++++++++++++++++++++++++++++
fs/nfsd/nfs4xdr.c | 27 +++++++++++++++++++++++++--
fs/nfsd/xdr4.h | 2 ++
4 files changed, 56 insertions(+), 2 deletions(-)
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 0f67f4a7b8b2..19ffb4f966d0 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -3447,6 +3447,7 @@ static const struct nfsd4_operation nfsd4_ops[] = {
/* NFSv4.1 operations */
[OP_EXCHANGE_ID] = {
.op_func = nfsd4_exchange_id,
+ .op_release = nfsd4_exchange_id_release,
.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
| OP_MODIFIES_SOMETHING,
.op_name = "OP_EXCHANGE_ID",
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index a366fb1c1b9b..68b38bc41828 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3475,6 +3475,13 @@ static __be32 copy_impl_id(struct nfs4_client *clp,
return 0;
}
+void
+nfsd4_exchange_id_release(union nfsd4_op_u *u)
+{
+ struct nfsd4_exchange_id *exid = &u->exchange_id;
+ kfree(exid->server_impl_name);
+}
+
__be32
nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
@@ -3495,6 +3502,12 @@ nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
__func__, rqstp, exid, exid->clname.len, exid->clname.data,
addr_str, exid->flags, exid->spa_how);
+ exid->server_impl_name = kasprintf(GFP_KERNEL, "%s %s %s %s",
+ utsname()->sysname, utsname()->release,
+ utsname()->version, utsname()->machine);
+ if (!exid->server_impl_name)
+ return nfserr_jukebox;
+
if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
return nfserr_inval;
@@ -3632,6 +3645,21 @@ nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
nfsd4_set_ex_flags(conf, exid);
+ exid->nii_domain.len = sizeof("kernel.org")-1;
+ exid->nii_domain.data = "kernel.org";
+
+ /* Note that RFC 8881 places no length limit on
+ * nii_name, but this implementation permits no
+ * more than NFS4_OPAQUE_LIMIT bytes */
+ exid->nii_name.len = strlen(exid->server_impl_name);
+ if (exid->nii_name.len > NFS4_OPAQUE_LIMIT)
+ exid->nii_name.len = NFS4_OPAQUE_LIMIT;
+ exid->nii_name.data = exid->server_impl_name;
+
+ /* just send zeros - the date is in nii_name */
+ exid->nii_time.tv_sec = 0;
+ exid->nii_time.tv_nsec = 0;
+
dprintk("nfsd4_exchange_id seqid %d flags %x\n",
conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
status = nfs_ok;
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index b45ea5757652..85334f4483eb 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -4833,6 +4833,28 @@ nfsd4_encode_server_owner4(struct xdr_stream *xdr, struct svc_rqst *rqstp)
return nfsd4_encode_opaque(xdr, nn->nfsd_name, strlen(nn->nfsd_name));
}
+static __be32
+nfsd4_encode_nfs_impl_id4(struct xdr_stream *xdr, struct nfsd4_exchange_id *exid)
+{
+ __be32 status;
+
+ /* array count = 1 */
+ if (xdr_stream_encode_u32(xdr, 1) != XDR_UNIT)
+ return nfserr_resource;
+ /* nii_domain */
+ status = nfsd4_encode_opaque(xdr, exid->nii_domain.data,
+ exid->nii_domain.len);
+ if (status != nfs_ok)
+ return status;
+ /* nii_name */
+ status = nfsd4_encode_opaque(xdr, exid->nii_name.data,
+ exid->nii_name.len);
+ if (status != nfs_ok)
+ return status;
+ /* nii_time */
+ return nfsd4_encode_nfstime4(xdr, &exid->nii_time);
+}
+
static __be32
nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
union nfsd4_op_u *u)
@@ -4867,8 +4889,9 @@ nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
if (nfserr != nfs_ok)
return nfserr;
/* eir_server_impl_id<1> */
- if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
- return nfserr_resource;
+ nfserr = nfsd4_encode_nfs_impl_id4(xdr, exid);
+ if (nfserr != nfs_ok)
+ return nfserr;
return nfs_ok;
}
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index fbdd42cde1fa..891861e8bb0c 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -567,6 +567,7 @@ struct nfsd4_exchange_id {
struct xdr_netobj nii_domain;
struct xdr_netobj nii_name;
struct timespec64 nii_time;
+ char * server_impl_name;
};
struct nfsd4_sequence {
@@ -929,6 +930,7 @@ extern __be32 nfsd4_setclientid(struct svc_rqst *rqstp,
struct nfsd4_compound_state *, union nfsd4_op_u *u);
extern __be32 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
struct nfsd4_compound_state *, union nfsd4_op_u *u);
+void nfsd4_exchange_id_release(union nfsd4_op_u *u);
extern __be32 nfsd4_exchange_id(struct svc_rqst *rqstp,
struct nfsd4_compound_state *, union nfsd4_op_u *u);
extern __be32 nfsd4_backchannel_ctl(struct svc_rqst *,
--
2.20.1
