1 files changed, 100 insertions, 1 deletions

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 15809dfd88a5..b3d55c6747fd 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -56,6 +56,8 @@
 #include <linux/nfsd_idmap.h>
 #include <linux/nfs4.h>
 #include <linux/nfs4_acl.h>
+#include <linux/sunrpc/gss_api.h>
+#include <linux/sunrpc/svcauth_gss.h>
 
 #define NFSDDBG_FACILITY                NFSDDBG_XDR
 
@@ -819,6 +821,23 @@ nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 }
 
 static __be32
+nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
+                     struct nfsd4_secinfo *secinfo)
+{
+        DECODE_HEAD;
+
+        READ_BUF(4);
+        READ32(secinfo->si_namelen);
+        READ_BUF(secinfo->si_namelen);
+        SAVEMEM(secinfo->si_name, secinfo->si_namelen);
+        status = check_filename(secinfo->si_name, secinfo->si_namelen,
+                                                                nfserr_noent);
+        if (status)
+                return status;
+        DECODE_TAIL;
+}
+
+static __be32
 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 {
         DECODE_HEAD;
@@ -1131,6 +1150,9 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
                 case OP_SAVEFH:
                         op->status = nfs_ok;
                         break;
+                case OP_SECINFO:
+                        op->status = nfsd4_decode_secinfo(argp, &op->u.secinfo);
+                        break;
                 case OP_SETATTR:
                         op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
                         break;
@@ -1296,7 +1318,7 @@ static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *
         char *path, *rootpath;
 
         fh_init(&tmp_fh, NFS4_FHSIZE);
-        *stat = exp_pseudoroot(rqstp->rq_client, &tmp_fh, &rqstp->rq_chandle);
+        *stat = exp_pseudoroot(rqstp, &tmp_fh);
         if (*stat)
                 return NULL;
         rootpath = tmp_fh.fh_export->ex_path;
@@ -1847,11 +1869,19 @@ nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
         if (d_mountpoint(dentry)) {
                 int err;
 
+                /*
+                 * Why the heck aren't we just using nfsd_lookup??
+                 * Different "."/".." handling?  Something else?
+                 * At least, add a comment here to explain....
+                 */
                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
                 if (err) {
                         nfserr = nfserrno(err);
                         goto out_put;
                 }
+                nfserr = check_nfsd_access(exp, cd->rd_rqstp);
+                if (nfserr)
+                        goto out_put;
 
         }
         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
@@ -2419,6 +2449,72 @@ nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_
         }
 }
 
+static void
+nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, int nfserr,
+                     struct nfsd4_secinfo *secinfo)
+{
+        int i = 0;
+        struct svc_export *exp = secinfo->si_exp;
+        u32 nflavs;
+        struct exp_flavor_info *flavs;
+        struct exp_flavor_info def_flavs[2];
+        ENCODE_HEAD;
+
+        if (nfserr)
+                goto out;
+        if (exp->ex_nflavors) {
+                flavs = exp->ex_flavors;
+                nflavs = exp->ex_nflavors;
+        } else { /* Handling of some defaults in absence of real secinfo: */
+                flavs = def_flavs;
+                if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
+                        nflavs = 2;
+                        flavs[0].pseudoflavor = RPC_AUTH_UNIX;
+                        flavs[1].pseudoflavor = RPC_AUTH_NULL;
+                } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
+                        nflavs = 1;
+                        flavs[0].pseudoflavor
+                                        = svcauth_gss_flavor(exp->ex_client);
+                } else {
+                        nflavs = 1;
+                        flavs[0].pseudoflavor
+                                        = exp->ex_client->flavour->flavour;
+                }
+        }
+
+        RESERVE_SPACE(4);
+        WRITE32(nflavs);
+        ADJUST_ARGS();
+        for (i = 0; i < nflavs; i++) {
+                u32 flav = flavs[i].pseudoflavor;
+                struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
+
+                if (gm) {
+                        RESERVE_SPACE(4);
+                        WRITE32(RPC_AUTH_GSS);
+                        ADJUST_ARGS();
+                        RESERVE_SPACE(4 + gm->gm_oid.len);
+                        WRITE32(gm->gm_oid.len);
+                        WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
+                        ADJUST_ARGS();
+                        RESERVE_SPACE(4);
+                        WRITE32(0); /* qop */
+                        ADJUST_ARGS();
+                        RESERVE_SPACE(4);
+                        WRITE32(gss_pseudoflavor_to_service(gm, flav));
+                        ADJUST_ARGS();
+                        gss_mech_put(gm);
+                } else {
+                        RESERVE_SPACE(4);
+                        WRITE32(flav);
+                        ADJUST_ARGS();
+                }
+        }
+out:
+        if (exp)
+                exp_put(exp);
+}
+
 /*
  * The SETATTR encode routine is special -- it always encodes a bitmap,
  * regardless of the error status.
@@ -2559,6 +2655,9 @@ nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
                 break;
         case OP_SAVEFH:
                 break;
+        case OP_SECINFO:
+                nfsd4_encode_secinfo(resp, op->status, &op->u.secinfo);
+                break;
         case OP_SETATTR:
                 nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
                 break;