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path: root/fs/nfs/nfs4xdr.c
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-rw-r--r--fs/nfs/nfs4xdr.c218
1 files changed, 212 insertions, 6 deletions
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 7c5d70efe720..1750d996f49f 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -411,6 +411,15 @@ static int nfs_stat_to_errno(int);
#define NFS4_dec_setacl_sz (compound_decode_hdr_maxsz + \
decode_putfh_maxsz + \
op_decode_hdr_maxsz + nfs4_fattr_bitmap_maxsz)
+#define NFS4_enc_fs_locations_sz \
+ (compound_encode_hdr_maxsz + \
+ encode_putfh_maxsz + \
+ encode_getattr_maxsz)
+#define NFS4_dec_fs_locations_sz \
+ (compound_decode_hdr_maxsz + \
+ decode_putfh_maxsz + \
+ op_decode_hdr_maxsz + \
+ nfs4_fattr_bitmap_maxsz)
static struct {
unsigned int mode;
@@ -722,6 +731,13 @@ static int encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask)
bitmask[1] & nfs4_fsinfo_bitmap[1]);
}
+static int encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask)
+{
+ return encode_getattr_two(xdr,
+ bitmask[0] & nfs4_fs_locations_bitmap[0],
+ bitmask[1] & nfs4_fs_locations_bitmap[1]);
+}
+
static int encode_getfh(struct xdr_stream *xdr)
{
uint32_t *p;
@@ -2003,6 +2019,38 @@ out:
}
/*
+ * Encode FS_LOCATIONS request
+ */
+static int nfs4_xdr_enc_fs_locations(struct rpc_rqst *req, uint32_t *p, struct nfs4_fs_locations_arg *args)
+{
+ struct xdr_stream xdr;
+ struct compound_hdr hdr = {
+ .nops = 3,
+ };
+ struct rpc_auth *auth = req->rq_task->tk_auth;
+ int replen;
+ int status;
+
+ xdr_init_encode(&xdr, &req->rq_snd_buf, p);
+ encode_compound_hdr(&xdr, &hdr);
+ if ((status = encode_putfh(&xdr, args->dir_fh)) != 0)
+ goto out;
+ if ((status = encode_lookup(&xdr, args->name)) != 0)
+ goto out;
+ if ((status = encode_fs_locations(&xdr, args->bitmask)) != 0)
+ goto out;
+ /* set up reply
+ * toplevel_status + OP_PUTFH + status
+ * + OP_LOOKUP + status + OP_GETATTR + status = 7
+ */
+ replen = (RPC_REPHDRSIZE + auth->au_rslack + 7) << 2;
+ xdr_inline_pages(&req->rq_rcv_buf, replen, &args->page,
+ 0, PAGE_SIZE);
+out:
+ return status;
+}
+
+/*
* START OF "GENERIC" DECODE ROUTINES.
* These may look a little ugly since they are imported from a "generic"
* set of XDR encode/decode routines which are intended to be shared by
@@ -2036,7 +2084,7 @@ out:
} \
} while (0)
-static int decode_opaque_inline(struct xdr_stream *xdr, uint32_t *len, char **string)
+static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
{
uint32_t *p;
@@ -2087,7 +2135,7 @@ static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
static int decode_ace(struct xdr_stream *xdr, void *ace, struct nfs4_client *clp)
{
uint32_t *p;
- uint32_t strlen;
+ unsigned int strlen;
char *str;
READ_BUF(12);
@@ -2217,7 +2265,7 @@ static int decode_attr_symlink_support(struct xdr_stream *xdr, uint32_t *bitmap,
return 0;
}
-static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fsid *fsid)
+static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fsid *fsid)
{
uint32_t *p;
@@ -2285,6 +2333,22 @@ static int decode_attr_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t
return 0;
}
+static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
+{
+ uint32_t *p;
+
+ *fileid = 0;
+ if (unlikely(bitmap[1] & (FATTR4_WORD1_MOUNTED_ON_FILEID - 1U)))
+ return -EIO;
+ if (likely(bitmap[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)) {
+ READ_BUF(8);
+ READ64(*fileid);
+ bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
+ }
+ dprintk("%s: fileid=%Lu\n", __FUNCTION__, (unsigned long long)*fileid);
+ return 0;
+}
+
static int decode_attr_files_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
{
uint32_t *p;
@@ -2336,6 +2400,116 @@ static int decode_attr_files_total(struct xdr_stream *xdr, uint32_t *bitmap, uin
return status;
}
+static int decode_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
+{
+ int n;
+ uint32_t *p;
+ int status = 0;
+
+ READ_BUF(4);
+ READ32(n);
+ if (n < 0)
+ goto out_eio;
+ if (n == 0)
+ goto root_path;
+ dprintk("path ");
+ path->ncomponents = 0;
+ while (path->ncomponents < n) {
+ struct nfs4_string *component = &path->components[path->ncomponents];
+ status = decode_opaque_inline(xdr, &component->len, &component->data);
+ if (unlikely(status != 0))
+ goto out_eio;
+ if (path->ncomponents != n)
+ dprintk("/");
+ dprintk("%s", component->data);
+ if (path->ncomponents < NFS4_PATHNAME_MAXCOMPONENTS)
+ path->ncomponents++;
+ else {
+ dprintk("cannot parse %d components in path\n", n);
+ goto out_eio;
+ }
+ }
+out:
+ dprintk("\n");
+ return status;
+root_path:
+/* a root pathname is sent as a zero component4 */
+ path->ncomponents = 1;
+ path->components[0].len=0;
+ path->components[0].data=NULL;
+ dprintk("path /\n");
+ goto out;
+out_eio:
+ dprintk(" status %d", status);
+ status = -EIO;
+ goto out;
+}
+
+static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fs_locations *res)
+{
+ int n;
+ uint32_t *p;
+ int status = -EIO;
+
+ if (unlikely(bitmap[0] & (FATTR4_WORD0_FS_LOCATIONS -1U)))
+ goto out;
+ status = 0;
+ if (unlikely(!(bitmap[0] & FATTR4_WORD0_FS_LOCATIONS)))
+ goto out;
+ dprintk("%s: fsroot ", __FUNCTION__);
+ status = decode_pathname(xdr, &res->fs_path);
+ if (unlikely(status != 0))
+ goto out;
+ READ_BUF(4);
+ READ32(n);
+ if (n <= 0)
+ goto out_eio;
+ res->nlocations = 0;
+ while (res->nlocations < n) {
+ int m;
+ struct nfs4_fs_location *loc = &res->locations[res->nlocations];
+
+ READ_BUF(4);
+ READ32(m);
+ if (m <= 0)
+ goto out_eio;
+
+ loc->nservers = 0;
+ dprintk("%s: servers ", __FUNCTION__);
+ while (loc->nservers < m) {
+ struct nfs4_string *server = &loc->servers[loc->nservers];
+ status = decode_opaque_inline(xdr, &server->len, &server->data);
+ if (unlikely(status != 0))
+ goto out_eio;
+ dprintk("%s ", server->data);
+ if (loc->nservers < NFS4_FS_LOCATION_MAXSERVERS)
+ loc->nservers++;
+ else {
+ int i;
+ dprintk("%s: using first %d of %d servers returned for location %d\n", __FUNCTION__, NFS4_FS_LOCATION_MAXSERVERS, m, res->nlocations);
+ for (i = loc->nservers; i < m; i++) {
+ int len;
+ char *data;
+ status = decode_opaque_inline(xdr, &len, &data);
+ if (unlikely(status != 0))
+ goto out_eio;
+ }
+ }
+ }
+ status = decode_pathname(xdr, &loc->rootpath);
+ if (unlikely(status != 0))
+ goto out_eio;
+ if (res->nlocations < NFS4_FS_LOCATIONS_MAXENTRIES)
+ res->nlocations++;
+ }
+out:
+ dprintk("%s: fs_locations done, error = %d\n", __FUNCTION__, status);
+ return status;
+out_eio:
+ status = -EIO;
+ goto out;
+}
+
static int decode_attr_maxfilesize(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
{
uint32_t *p;
@@ -2841,6 +3015,7 @@ static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr, cons
bitmap[2] = {0},
type;
int status, fmode = 0;
+ uint64_t fileid;
if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
goto xdr_error;
@@ -2863,10 +3038,14 @@ static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr, cons
goto xdr_error;
if ((status = decode_attr_size(xdr, bitmap, &fattr->size)) != 0)
goto xdr_error;
- if ((status = decode_attr_fsid(xdr, bitmap, &fattr->fsid_u.nfs4)) != 0)
+ if ((status = decode_attr_fsid(xdr, bitmap, &fattr->fsid)) != 0)
goto xdr_error;
if ((status = decode_attr_fileid(xdr, bitmap, &fattr->fileid)) != 0)
goto xdr_error;
+ if ((status = decode_attr_fs_locations(xdr, bitmap, container_of(fattr,
+ struct nfs4_fs_locations,
+ fattr))) != 0)
+ goto xdr_error;
if ((status = decode_attr_mode(xdr, bitmap, &fattr->mode)) != 0)
goto xdr_error;
fattr->mode |= fmode;
@@ -2886,6 +3065,10 @@ static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr, cons
goto xdr_error;
if ((status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime)) != 0)
goto xdr_error;
+ if ((status = decode_attr_mounted_on_fileid(xdr, bitmap, &fileid)) != 0)
+ goto xdr_error;
+ if (fattr->fileid == 0 && fileid != 0)
+ fattr->fileid = fileid;
if ((status = verify_attr_len(xdr, savep, attrlen)) == 0)
fattr->valid = NFS_ATTR_FATTR | NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4;
xdr_error:
@@ -3350,8 +3533,7 @@ static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
attrlen, recvd);
return -EINVAL;
}
- if (attrlen <= *acl_len)
- xdr_read_pages(xdr, attrlen);
+ xdr_read_pages(xdr, attrlen);
*acl_len = attrlen;
} else
status = -EOPNOTSUPP;
@@ -4211,6 +4393,29 @@ out:
return status;
}
+/*
+ * FS_LOCATIONS request
+ */
+static int nfs4_xdr_dec_fs_locations(struct rpc_rqst *req, uint32_t *p, struct nfs4_fs_locations *res)
+{
+ struct xdr_stream xdr;
+ struct compound_hdr hdr;
+ int status;
+
+ xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
+ status = decode_compound_hdr(&xdr, &hdr);
+ if (status != 0)
+ goto out;
+ if ((status = decode_putfh(&xdr)) != 0)
+ goto out;
+ if ((status = decode_lookup(&xdr)) != 0)
+ goto out;
+ xdr_enter_page(&xdr, PAGE_SIZE);
+ status = decode_getfattr(&xdr, &res->fattr, res->server);
+out:
+ return status;
+}
+
uint32_t *nfs4_decode_dirent(uint32_t *p, struct nfs_entry *entry, int plus)
{
uint32_t bitmap[2] = {0};
@@ -4382,6 +4587,7 @@ struct rpc_procinfo nfs4_procedures[] = {
PROC(DELEGRETURN, enc_delegreturn, dec_delegreturn),
PROC(GETACL, enc_getacl, dec_getacl),
PROC(SETACL, enc_setacl, dec_setacl),
+ PROC(FS_LOCATIONS, enc_fs_locations, dec_fs_locations),
};
struct rpc_version nfs_version4 = {
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.