nfsd: decode implementation id

Decode the implementation ID and display in nfsd/clients/#/info.  It may
be help identify the client.  It won't be used otherwise.

(When this went into the protocol, I thought the implementation ID would
be a slippery slope towards implementation-specific workarounds as with
the http user-agent.  But I guess I was wrong, the risk seems pretty low
now.)

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 640cd22..94de5c3 100644 (file)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1899,6 +1899,8 @@ static void __free_client(struct kref *k)
        free_svc_cred(&clp->cl_cred);
        kfree(clp->cl_ownerstr_hashtbl);
        kfree(clp->cl_name.data);
+       kfree(clp->cl_nii_domain.data);
+       kfree(clp->cl_nii_name.data);
        idr_destroy(&clp->cl_stateids);
        kmem_cache_free(client_slab, clp);
 }
@@ -2261,6 +2263,15 @@ static int client_info_show(struct seq_file *m, void *v)
        seq_printf(m, "name: ");
        seq_quote_mem(m, clp->cl_name.data, clp->cl_name.len);
        seq_printf(m, "\nminor version: %d\n", clp->cl_minorversion);
+       if (clp->cl_nii_domain.data) {
+               seq_printf(m, "Implementation domain: ");
+               seq_quote_mem(m, clp->cl_nii_domain.data,
+                                       clp->cl_nii_domain.len);
+               seq_printf(m, "\nImplementation name: ");
+               seq_quote_mem(m, clp->cl_nii_name.data, clp->cl_nii_name.len);
+               seq_printf(m, "\nImplementation time: [%ld, %ld]\n",
+                       clp->cl_nii_time.tv_sec, clp->cl_nii_time.tv_nsec);
+       }
        drop_client(clp);
 
        return 0;
@@ -2901,6 +2912,22 @@ static bool client_has_state(struct nfs4_client *clp)
                || !list_empty(&clp->async_copies);
 }
 
+static __be32 copy_impl_id(struct nfs4_client *clp,
+                               struct nfsd4_exchange_id *exid)
+{
+       if (!exid->nii_domain.data)
+               return 0;
+       xdr_netobj_dup(&clp->cl_nii_domain, &exid->nii_domain, GFP_KERNEL);
+       if (!clp->cl_nii_domain.data)
+               return nfserr_jukebox;
+       xdr_netobj_dup(&clp->cl_nii_name, &exid->nii_name, GFP_KERNEL);
+       if (!clp->cl_nii_name.data)
+               return nfserr_jukebox;
+       clp->cl_nii_time.tv_sec = exid->nii_time.tv_sec;
+       clp->cl_nii_time.tv_nsec = exid->nii_time.tv_nsec;
+       return 0;
+}
+
 __be32
 nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
                union nfsd4_op_u *u)
@@ -2927,6 +2954,9 @@ nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
        new = create_client(exid->clname, rqstp, &verf);
        if (new == NULL)
                return nfserr_jukebox;
+       status = copy_impl_id(new, exid);
+       if (status)
+               goto out_nolock;
 
        switch (exid->spa_how) {
        case SP4_MACH_CRED:

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 548a5a8..4428118 100644 (file)
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1389,7 +1389,6 @@ nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
                goto xdr_error;
        }
 
-       /* Ignore Implementation ID */
        READ_BUF(4);    /* nfs_impl_id4 array length */
        dummy = be32_to_cpup(p++);
 
@@ -1397,21 +1396,19 @@ nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
                goto xdr_error;
 
        if (dummy == 1) {
-               /* nii_domain */
-               READ_BUF(4);
-               dummy = be32_to_cpup(p++);
-               READ_BUF(dummy);
-               p += XDR_QUADLEN(dummy);
+               status = nfsd4_decode_opaque(argp, &exid->nii_domain);
+               if (status)
+                       goto xdr_error;
 
                /* nii_name */
-               READ_BUF(4);
-               dummy = be32_to_cpup(p++);
-               READ_BUF(dummy);
-               p += XDR_QUADLEN(dummy);
+               status = nfsd4_decode_opaque(argp, &exid->nii_name);
+               if (status)
+                       goto xdr_error;
 
                /* nii_date */
-               READ_BUF(12);
-               p += 3;
+               status = nfsd4_decode_time(argp, &exid->nii_time);
+               if (status)
+                       goto xdr_error;
        }
        DECODE_TAIL;
 }

diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 81852cb..8cb20ca 100644 (file)
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -317,6 +317,10 @@ struct nfs4_client {
        clientid_t              cl_clientid;    /* generated by server */
        nfs4_verifier           cl_confirm;     /* generated by server */
        u32                     cl_minorversion;
+       /* NFSv4.1 client implementation id: */
+       struct xdr_netobj       cl_nii_domain;
+       struct xdr_netobj       cl_nii_name;
+       struct timespec         cl_nii_time;
 
        /* for v4.0 and v4.1 callbacks: */
        struct nfs4_cb_conn     cl_cb_conn;

diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index c2b631e..d64c870 100644 (file)
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -410,6 +410,9 @@ struct nfsd4_exchange_id {
        int             spa_how;
        u32             spo_must_enforce[3];
        u32             spo_must_allow[3];
+       struct xdr_netobj nii_domain;
+       struct xdr_netobj nii_name;
+       struct timespec64 nii_time;
 };
 
 struct nfsd4_sequence {