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- /*
- * linux/fs/nfs/callback_xdr.c
- *
- * Copyright (C) 2004 Trond Myklebust
- *
- * NFSv4 callback encode/decode procedures
- */
- #include <linux/kernel.h>
- #include <linux/sunrpc/svc.h>
- #include <linux/nfs4.h>
- #include <linux/nfs_fs.h>
- #include <linux/ratelimit.h>
- #include <linux/printk.h>
- #include <linux/slab.h>
- #include <linux/sunrpc/bc_xprt.h>
- #include "nfs4_fs.h"
- #include "callback.h"
- #include "internal.h"
- #include "nfs4session.h"
- #define CB_OP_TAGLEN_MAXSZ (512)
- #define CB_OP_HDR_RES_MAXSZ (2 * 4) // opcode, status
- #define CB_OP_GETATTR_BITMAP_MAXSZ (4 * 4) // bitmap length, 3 bitmaps
- #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
- CB_OP_GETATTR_BITMAP_MAXSZ + \
- /* change, size, ctime, mtime */\
- (2 + 2 + 3 + 3) * 4)
- #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
- #if defined(CONFIG_NFS_V4_1)
- #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
- #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
- #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
- NFS4_MAX_SESSIONID_LEN + \
- (1 + 3) * 4) // seqid, 3 slotids
- #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
- #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
- #endif /* CONFIG_NFS_V4_1 */
- #define NFSDBG_FACILITY NFSDBG_CALLBACK
- /* Internal error code */
- #define NFS4ERR_RESOURCE_HDR 11050
- typedef __be32 (*callback_process_op_t)(void *, void *,
- struct cb_process_state *);
- typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
- typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
- struct callback_op {
- callback_process_op_t process_op;
- callback_decode_arg_t decode_args;
- callback_encode_res_t encode_res;
- long res_maxsize;
- };
- static struct callback_op callback_ops[];
- static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
- {
- return htonl(NFS4_OK);
- }
- static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
- {
- return xdr_argsize_check(rqstp, p);
- }
- static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
- {
- return xdr_ressize_check(rqstp, p);
- }
- static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
- {
- __be32 *p;
- p = xdr_inline_decode(xdr, nbytes);
- if (unlikely(p == NULL))
- printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
- return p;
- }
- static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
- {
- __be32 *p;
- p = read_buf(xdr, 4);
- if (unlikely(p == NULL))
- return htonl(NFS4ERR_RESOURCE);
- *len = ntohl(*p);
- if (*len != 0) {
- p = read_buf(xdr, *len);
- if (unlikely(p == NULL))
- return htonl(NFS4ERR_RESOURCE);
- *str = (const char *)p;
- } else
- *str = NULL;
- return 0;
- }
- static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
- {
- __be32 *p;
- p = read_buf(xdr, 4);
- if (unlikely(p == NULL))
- return htonl(NFS4ERR_RESOURCE);
- fh->size = ntohl(*p);
- if (fh->size > NFS4_FHSIZE)
- return htonl(NFS4ERR_BADHANDLE);
- p = read_buf(xdr, fh->size);
- if (unlikely(p == NULL))
- return htonl(NFS4ERR_RESOURCE);
- memcpy(&fh->data[0], p, fh->size);
- memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
- return 0;
- }
- static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
- {
- __be32 *p;
- unsigned int attrlen;
- p = read_buf(xdr, 4);
- if (unlikely(p == NULL))
- return htonl(NFS4ERR_RESOURCE);
- attrlen = ntohl(*p);
- p = read_buf(xdr, attrlen << 2);
- if (unlikely(p == NULL))
- return htonl(NFS4ERR_RESOURCE);
- if (likely(attrlen > 0))
- bitmap[0] = ntohl(*p++);
- if (attrlen > 1)
- bitmap[1] = ntohl(*p);
- return 0;
- }
- static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
- {
- __be32 *p;
- p = read_buf(xdr, NFS4_STATEID_SIZE);
- if (unlikely(p == NULL))
- return htonl(NFS4ERR_RESOURCE);
- memcpy(stateid, p, NFS4_STATEID_SIZE);
- return 0;
- }
- static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
- {
- __be32 *p;
- __be32 status;
- status = decode_string(xdr, &hdr->taglen, &hdr->tag);
- if (unlikely(status != 0))
- return status;
- /* We do not like overly long tags! */
- if (hdr->taglen > CB_OP_TAGLEN_MAXSZ) {
- printk("NFS: NFSv4 CALLBACK %s: client sent tag of length %u\n",
- __func__, hdr->taglen);
- return htonl(NFS4ERR_RESOURCE);
- }
- p = read_buf(xdr, 12);
- if (unlikely(p == NULL))
- return htonl(NFS4ERR_RESOURCE);
- hdr->minorversion = ntohl(*p++);
- /* Check for minor version support */
- if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
- hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
- } else {
- pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
- "illegal minor version %u!\n",
- __func__, hdr->minorversion);
- return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
- }
- hdr->nops = ntohl(*p);
- dprintk("%s: minorversion %d nops %d\n", __func__,
- hdr->minorversion, hdr->nops);
- return 0;
- }
- static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
- {
- __be32 *p;
- p = read_buf(xdr, 4);
- if (unlikely(p == NULL))
- return htonl(NFS4ERR_RESOURCE_HDR);
- *op = ntohl(*p);
- return 0;
- }
- static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
- {
- __be32 status;
- status = decode_fh(xdr, &args->fh);
- if (unlikely(status != 0))
- goto out;
- status = decode_bitmap(xdr, args->bitmap);
- out:
- dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
- return status;
- }
- static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
- {
- __be32 *p;
- __be32 status;
- status = decode_stateid(xdr, &args->stateid);
- if (unlikely(status != 0))
- goto out;
- p = read_buf(xdr, 4);
- if (unlikely(p == NULL)) {
- status = htonl(NFS4ERR_RESOURCE);
- goto out;
- }
- args->truncate = ntohl(*p);
- status = decode_fh(xdr, &args->fh);
- out:
- dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
- return status;
- }
- #if defined(CONFIG_NFS_V4_1)
- static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
- struct xdr_stream *xdr,
- struct cb_layoutrecallargs *args)
- {
- __be32 *p;
- __be32 status = 0;
- uint32_t iomode;
- p = read_buf(xdr, 4 * sizeof(uint32_t));
- if (unlikely(p == NULL)) {
- status = htonl(NFS4ERR_BADXDR);
- goto out;
- }
- args->cbl_layout_type = ntohl(*p++);
- /* Depite the spec's xdr, iomode really belongs in the FILE switch,
- * as it is unusable and ignored with the other types.
- */
- iomode = ntohl(*p++);
- args->cbl_layoutchanged = ntohl(*p++);
- args->cbl_recall_type = ntohl(*p++);
- if (args->cbl_recall_type == RETURN_FILE) {
- args->cbl_range.iomode = iomode;
- status = decode_fh(xdr, &args->cbl_fh);
- if (unlikely(status != 0))
- goto out;
- p = read_buf(xdr, 2 * sizeof(uint64_t));
- if (unlikely(p == NULL)) {
- status = htonl(NFS4ERR_BADXDR);
- goto out;
- }
- p = xdr_decode_hyper(p, &args->cbl_range.offset);
- p = xdr_decode_hyper(p, &args->cbl_range.length);
- status = decode_stateid(xdr, &args->cbl_stateid);
- if (unlikely(status != 0))
- goto out;
- } else if (args->cbl_recall_type == RETURN_FSID) {
- p = read_buf(xdr, 2 * sizeof(uint64_t));
- if (unlikely(p == NULL)) {
- status = htonl(NFS4ERR_BADXDR);
- goto out;
- }
- p = xdr_decode_hyper(p, &args->cbl_fsid.major);
- p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
- } else if (args->cbl_recall_type != RETURN_ALL) {
- status = htonl(NFS4ERR_BADXDR);
- goto out;
- }
- dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n",
- __func__,
- args->cbl_layout_type, iomode,
- args->cbl_layoutchanged, args->cbl_recall_type);
- out:
- dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
- return status;
- }
- static
- __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
- struct xdr_stream *xdr,
- struct cb_devicenotifyargs *args)
- {
- __be32 *p;
- __be32 status = 0;
- u32 tmp;
- int n, i;
- args->ndevs = 0;
- /* Num of device notifications */
- p = read_buf(xdr, sizeof(uint32_t));
- if (unlikely(p == NULL)) {
- status = htonl(NFS4ERR_BADXDR);
- goto out;
- }
- n = ntohl(*p++);
- if (n <= 0)
- goto out;
- if (n > ULONG_MAX / sizeof(*args->devs)) {
- status = htonl(NFS4ERR_BADXDR);
- goto out;
- }
- args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
- if (!args->devs) {
- status = htonl(NFS4ERR_DELAY);
- goto out;
- }
- /* Decode each dev notification */
- for (i = 0; i < n; i++) {
- struct cb_devicenotifyitem *dev = &args->devs[i];
- p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
- if (unlikely(p == NULL)) {
- status = htonl(NFS4ERR_BADXDR);
- goto err;
- }
- tmp = ntohl(*p++); /* bitmap size */
- if (tmp != 1) {
- status = htonl(NFS4ERR_INVAL);
- goto err;
- }
- dev->cbd_notify_type = ntohl(*p++);
- if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
- dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
- status = htonl(NFS4ERR_INVAL);
- goto err;
- }
- tmp = ntohl(*p++); /* opaque size */
- if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
- (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
- ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
- (tmp != NFS4_DEVICEID4_SIZE + 4))) {
- status = htonl(NFS4ERR_INVAL);
- goto err;
- }
- dev->cbd_layout_type = ntohl(*p++);
- memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
- p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
- if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
- p = read_buf(xdr, sizeof(uint32_t));
- if (unlikely(p == NULL)) {
- status = htonl(NFS4ERR_BADXDR);
- goto err;
- }
- dev->cbd_immediate = ntohl(*p++);
- } else {
- dev->cbd_immediate = 0;
- }
- args->ndevs++;
- dprintk("%s: type %d layout 0x%x immediate %d\n",
- __func__, dev->cbd_notify_type, dev->cbd_layout_type,
- dev->cbd_immediate);
- }
- out:
- dprintk("%s: status %d ndevs %d\n",
- __func__, ntohl(status), args->ndevs);
- return status;
- err:
- kfree(args->devs);
- goto out;
- }
- static __be32 decode_sessionid(struct xdr_stream *xdr,
- struct nfs4_sessionid *sid)
- {
- __be32 *p;
- p = read_buf(xdr, NFS4_MAX_SESSIONID_LEN);
- if (unlikely(p == NULL))
- return htonl(NFS4ERR_RESOURCE);
- memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
- return 0;
- }
- static __be32 decode_rc_list(struct xdr_stream *xdr,
- struct referring_call_list *rc_list)
- {
- __be32 *p;
- int i;
- __be32 status;
- status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
- if (status)
- goto out;
- status = htonl(NFS4ERR_RESOURCE);
- p = read_buf(xdr, sizeof(uint32_t));
- if (unlikely(p == NULL))
- goto out;
- rc_list->rcl_nrefcalls = ntohl(*p++);
- if (rc_list->rcl_nrefcalls) {
- p = read_buf(xdr,
- rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
- if (unlikely(p == NULL))
- goto out;
- rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
- sizeof(*rc_list->rcl_refcalls),
- GFP_KERNEL);
- if (unlikely(rc_list->rcl_refcalls == NULL))
- goto out;
- for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
- rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
- rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
- }
- }
- status = 0;
- out:
- return status;
- }
- static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
- struct xdr_stream *xdr,
- struct cb_sequenceargs *args)
- {
- __be32 *p;
- int i;
- __be32 status;
- status = decode_sessionid(xdr, &args->csa_sessionid);
- if (status)
- goto out;
- status = htonl(NFS4ERR_RESOURCE);
- p = read_buf(xdr, 5 * sizeof(uint32_t));
- if (unlikely(p == NULL))
- goto out;
- args->csa_addr = svc_addr(rqstp);
- args->csa_sequenceid = ntohl(*p++);
- args->csa_slotid = ntohl(*p++);
- args->csa_highestslotid = ntohl(*p++);
- args->csa_cachethis = ntohl(*p++);
- args->csa_nrclists = ntohl(*p++);
- args->csa_rclists = NULL;
- if (args->csa_nrclists) {
- args->csa_rclists = kmalloc_array(args->csa_nrclists,
- sizeof(*args->csa_rclists),
- GFP_KERNEL);
- if (unlikely(args->csa_rclists == NULL))
- goto out;
- for (i = 0; i < args->csa_nrclists; i++) {
- status = decode_rc_list(xdr, &args->csa_rclists[i]);
- if (status) {
- args->csa_nrclists = i;
- goto out_free;
- }
- }
- }
- status = 0;
- dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
- "highestslotid %u cachethis %d nrclists %u\n",
- __func__,
- ((u32 *)&args->csa_sessionid)[0],
- ((u32 *)&args->csa_sessionid)[1],
- ((u32 *)&args->csa_sessionid)[2],
- ((u32 *)&args->csa_sessionid)[3],
- args->csa_sequenceid, args->csa_slotid,
- args->csa_highestslotid, args->csa_cachethis,
- args->csa_nrclists);
- out:
- dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
- return status;
- out_free:
- for (i = 0; i < args->csa_nrclists; i++)
- kfree(args->csa_rclists[i].rcl_refcalls);
- kfree(args->csa_rclists);
- goto out;
- }
- static __be32 decode_recallany_args(struct svc_rqst *rqstp,
- struct xdr_stream *xdr,
- struct cb_recallanyargs *args)
- {
- uint32_t bitmap[2];
- __be32 *p, status;
- p = read_buf(xdr, 4);
- if (unlikely(p == NULL))
- return htonl(NFS4ERR_BADXDR);
- args->craa_objs_to_keep = ntohl(*p++);
- status = decode_bitmap(xdr, bitmap);
- if (unlikely(status))
- return status;
- args->craa_type_mask = bitmap[0];
- return 0;
- }
- static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
- struct xdr_stream *xdr,
- struct cb_recallslotargs *args)
- {
- __be32 *p;
- p = read_buf(xdr, 4);
- if (unlikely(p == NULL))
- return htonl(NFS4ERR_BADXDR);
- args->crsa_target_highest_slotid = ntohl(*p++);
- return 0;
- }
- #endif /* CONFIG_NFS_V4_1 */
- static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
- {
- __be32 *p;
- p = xdr_reserve_space(xdr, 4 + len);
- if (unlikely(p == NULL))
- return htonl(NFS4ERR_RESOURCE);
- xdr_encode_opaque(p, str, len);
- return 0;
- }
- #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
- #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
- static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
- {
- __be32 bm[2];
- __be32 *p;
- bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
- bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
- if (bm[1] != 0) {
- p = xdr_reserve_space(xdr, 16);
- if (unlikely(p == NULL))
- return htonl(NFS4ERR_RESOURCE);
- *p++ = htonl(2);
- *p++ = bm[0];
- *p++ = bm[1];
- } else if (bm[0] != 0) {
- p = xdr_reserve_space(xdr, 12);
- if (unlikely(p == NULL))
- return htonl(NFS4ERR_RESOURCE);
- *p++ = htonl(1);
- *p++ = bm[0];
- } else {
- p = xdr_reserve_space(xdr, 8);
- if (unlikely(p == NULL))
- return htonl(NFS4ERR_RESOURCE);
- *p++ = htonl(0);
- }
- *savep = p;
- return 0;
- }
- static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
- {
- __be32 *p;
- if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
- return 0;
- p = xdr_reserve_space(xdr, 8);
- if (unlikely(!p))
- return htonl(NFS4ERR_RESOURCE);
- p = xdr_encode_hyper(p, change);
- return 0;
- }
- static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
- {
- __be32 *p;
- if (!(bitmap[0] & FATTR4_WORD0_SIZE))
- return 0;
- p = xdr_reserve_space(xdr, 8);
- if (unlikely(!p))
- return htonl(NFS4ERR_RESOURCE);
- p = xdr_encode_hyper(p, size);
- return 0;
- }
- static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
- {
- __be32 *p;
- p = xdr_reserve_space(xdr, 12);
- if (unlikely(!p))
- return htonl(NFS4ERR_RESOURCE);
- p = xdr_encode_hyper(p, time->tv_sec);
- *p = htonl(time->tv_nsec);
- return 0;
- }
- static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
- {
- if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
- return 0;
- return encode_attr_time(xdr,time);
- }
- static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
- {
- if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
- return 0;
- return encode_attr_time(xdr,time);
- }
- static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
- {
- __be32 status;
- hdr->status = xdr_reserve_space(xdr, 4);
- if (unlikely(hdr->status == NULL))
- return htonl(NFS4ERR_RESOURCE);
- status = encode_string(xdr, hdr->taglen, hdr->tag);
- if (unlikely(status != 0))
- return status;
- hdr->nops = xdr_reserve_space(xdr, 4);
- if (unlikely(hdr->nops == NULL))
- return htonl(NFS4ERR_RESOURCE);
- return 0;
- }
- static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
- {
- __be32 *p;
-
- p = xdr_reserve_space(xdr, 8);
- if (unlikely(p == NULL))
- return htonl(NFS4ERR_RESOURCE_HDR);
- *p++ = htonl(op);
- *p = res;
- return 0;
- }
- static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
- {
- __be32 *savep = NULL;
- __be32 status = res->status;
-
- if (unlikely(status != 0))
- goto out;
- status = encode_attr_bitmap(xdr, res->bitmap, &savep);
- if (unlikely(status != 0))
- goto out;
- status = encode_attr_change(xdr, res->bitmap, res->change_attr);
- if (unlikely(status != 0))
- goto out;
- status = encode_attr_size(xdr, res->bitmap, res->size);
- if (unlikely(status != 0))
- goto out;
- status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
- if (unlikely(status != 0))
- goto out;
- status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
- *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
- out:
- dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
- return status;
- }
- #if defined(CONFIG_NFS_V4_1)
- static __be32 encode_sessionid(struct xdr_stream *xdr,
- const struct nfs4_sessionid *sid)
- {
- __be32 *p;
- p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
- if (unlikely(p == NULL))
- return htonl(NFS4ERR_RESOURCE);
- memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
- return 0;
- }
- static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
- struct xdr_stream *xdr,
- const struct cb_sequenceres *res)
- {
- __be32 *p;
- __be32 status = res->csr_status;
- if (unlikely(status != 0))
- goto out;
- status = encode_sessionid(xdr, &res->csr_sessionid);
- if (status)
- goto out;
- p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
- if (unlikely(p == NULL))
- return htonl(NFS4ERR_RESOURCE);
- *p++ = htonl(res->csr_sequenceid);
- *p++ = htonl(res->csr_slotid);
- *p++ = htonl(res->csr_highestslotid);
- *p++ = htonl(res->csr_target_highestslotid);
- out:
- dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
- return status;
- }
- static __be32
- preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
- {
- if (op_nr == OP_CB_SEQUENCE) {
- if (nop != 0)
- return htonl(NFS4ERR_SEQUENCE_POS);
- } else {
- if (nop == 0)
- return htonl(NFS4ERR_OP_NOT_IN_SESSION);
- }
- switch (op_nr) {
- case OP_CB_GETATTR:
- case OP_CB_RECALL:
- case OP_CB_SEQUENCE:
- case OP_CB_RECALL_ANY:
- case OP_CB_RECALL_SLOT:
- case OP_CB_LAYOUTRECALL:
- case OP_CB_NOTIFY_DEVICEID:
- *op = &callback_ops[op_nr];
- break;
- case OP_CB_NOTIFY:
- case OP_CB_PUSH_DELEG:
- case OP_CB_RECALLABLE_OBJ_AVAIL:
- case OP_CB_WANTS_CANCELLED:
- case OP_CB_NOTIFY_LOCK:
- return htonl(NFS4ERR_NOTSUPP);
- default:
- return htonl(NFS4ERR_OP_ILLEGAL);
- }
- return htonl(NFS_OK);
- }
- static void nfs4_callback_free_slot(struct nfs4_session *session)
- {
- struct nfs4_slot_table *tbl = &session->bc_slot_table;
- spin_lock(&tbl->slot_tbl_lock);
- /*
- * Let the state manager know callback processing done.
- * A single slot, so highest used slotid is either 0 or -1
- */
- tbl->highest_used_slotid = NFS4_NO_SLOT;
- nfs4_slot_tbl_drain_complete(tbl);
- spin_unlock(&tbl->slot_tbl_lock);
- }
- static void nfs4_cb_free_slot(struct cb_process_state *cps)
- {
- if (cps->slotid != NFS4_NO_SLOT)
- nfs4_callback_free_slot(cps->clp->cl_session);
- }
- #else /* CONFIG_NFS_V4_1 */
- static __be32
- preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
- {
- return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
- }
- static void nfs4_cb_free_slot(struct cb_process_state *cps)
- {
- }
- #endif /* CONFIG_NFS_V4_1 */
- #ifdef CONFIG_NFS_V4_2
- static __be32
- preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
- {
- __be32 status = preprocess_nfs41_op(nop, op_nr, op);
- if (status != htonl(NFS4ERR_OP_ILLEGAL))
- return status;
- if (op_nr == OP_CB_OFFLOAD)
- return htonl(NFS4ERR_NOTSUPP);
- return htonl(NFS4ERR_OP_ILLEGAL);
- }
- #else /* CONFIG_NFS_V4_2 */
- static __be32
- preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
- {
- return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
- }
- #endif /* CONFIG_NFS_V4_2 */
- static __be32
- preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
- {
- switch (op_nr) {
- case OP_CB_GETATTR:
- case OP_CB_RECALL:
- *op = &callback_ops[op_nr];
- break;
- default:
- return htonl(NFS4ERR_OP_ILLEGAL);
- }
- return htonl(NFS_OK);
- }
- static __be32 process_op(int nop, struct svc_rqst *rqstp,
- struct xdr_stream *xdr_in, void *argp,
- struct xdr_stream *xdr_out, void *resp,
- struct cb_process_state *cps)
- {
- struct callback_op *op = &callback_ops[0];
- unsigned int op_nr;
- __be32 status;
- long maxlen;
- __be32 res;
- dprintk("%s: start\n", __func__);
- status = decode_op_hdr(xdr_in, &op_nr);
- if (unlikely(status))
- return status;
- dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
- __func__, cps->minorversion, nop, op_nr);
- switch (cps->minorversion) {
- case 0:
- status = preprocess_nfs4_op(op_nr, &op);
- break;
- case 1:
- status = preprocess_nfs41_op(nop, op_nr, &op);
- break;
- case 2:
- status = preprocess_nfs42_op(nop, op_nr, &op);
- break;
- default:
- status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
- }
- if (status == htonl(NFS4ERR_OP_ILLEGAL))
- op_nr = OP_CB_ILLEGAL;
- if (status)
- goto encode_hdr;
- if (cps->drc_status) {
- status = cps->drc_status;
- goto encode_hdr;
- }
- maxlen = xdr_out->end - xdr_out->p;
- if (maxlen > 0 && maxlen < PAGE_SIZE) {
- status = op->decode_args(rqstp, xdr_in, argp);
- if (likely(status == 0))
- status = op->process_op(argp, resp, cps);
- } else
- status = htonl(NFS4ERR_RESOURCE);
- encode_hdr:
- res = encode_op_hdr(xdr_out, op_nr, status);
- if (unlikely(res))
- return res;
- if (op->encode_res != NULL && status == 0)
- status = op->encode_res(rqstp, xdr_out, resp);
- dprintk("%s: done, status = %d\n", __func__, ntohl(status));
- return status;
- }
- /*
- * Decode, process and encode a COMPOUND
- */
- static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
- {
- struct cb_compound_hdr_arg hdr_arg = { 0 };
- struct cb_compound_hdr_res hdr_res = { NULL };
- struct xdr_stream xdr_in, xdr_out;
- __be32 *p, status;
- struct cb_process_state cps = {
- .drc_status = 0,
- .clp = NULL,
- .slotid = NFS4_NO_SLOT,
- .net = SVC_NET(rqstp),
- };
- unsigned int nops = 0;
- dprintk("%s: start\n", __func__);
- xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
- p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
- xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
- status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
- if (status == htonl(NFS4ERR_RESOURCE))
- return rpc_garbage_args;
- if (hdr_arg.minorversion == 0) {
- cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
- if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp)) {
- if (cps.clp)
- nfs_put_client(cps.clp);
- goto out_invalidcred;
- }
- }
- cps.minorversion = hdr_arg.minorversion;
- hdr_res.taglen = hdr_arg.taglen;
- hdr_res.tag = hdr_arg.tag;
- if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) {
- if (cps.clp)
- nfs_put_client(cps.clp);
- return rpc_system_err;
- }
- while (status == 0 && nops != hdr_arg.nops) {
- status = process_op(nops, rqstp, &xdr_in,
- argp, &xdr_out, resp, &cps);
- nops++;
- }
- /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
- * resource error in cb_compound status without returning op */
- if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
- status = htonl(NFS4ERR_RESOURCE);
- nops--;
- }
- *hdr_res.status = status;
- *hdr_res.nops = htonl(nops);
- nfs4_cb_free_slot(&cps);
- nfs_put_client(cps.clp);
- dprintk("%s: done, status = %u\n", __func__, ntohl(status));
- return rpc_success;
- out_invalidcred:
- pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
- return rpc_autherr_badcred;
- }
- /*
- * Define NFS4 callback COMPOUND ops.
- */
- static struct callback_op callback_ops[] = {
- [0] = {
- .res_maxsize = CB_OP_HDR_RES_MAXSZ,
- },
- [OP_CB_GETATTR] = {
- .process_op = (callback_process_op_t)nfs4_callback_getattr,
- .decode_args = (callback_decode_arg_t)decode_getattr_args,
- .encode_res = (callback_encode_res_t)encode_getattr_res,
- .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
- },
- [OP_CB_RECALL] = {
- .process_op = (callback_process_op_t)nfs4_callback_recall,
- .decode_args = (callback_decode_arg_t)decode_recall_args,
- .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
- },
- #if defined(CONFIG_NFS_V4_1)
- [OP_CB_LAYOUTRECALL] = {
- .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
- .decode_args =
- (callback_decode_arg_t)decode_layoutrecall_args,
- .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
- },
- [OP_CB_NOTIFY_DEVICEID] = {
- .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
- .decode_args =
- (callback_decode_arg_t)decode_devicenotify_args,
- .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
- },
- [OP_CB_SEQUENCE] = {
- .process_op = (callback_process_op_t)nfs4_callback_sequence,
- .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
- .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
- .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
- },
- [OP_CB_RECALL_ANY] = {
- .process_op = (callback_process_op_t)nfs4_callback_recallany,
- .decode_args = (callback_decode_arg_t)decode_recallany_args,
- .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
- },
- [OP_CB_RECALL_SLOT] = {
- .process_op = (callback_process_op_t)nfs4_callback_recallslot,
- .decode_args = (callback_decode_arg_t)decode_recallslot_args,
- .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
- },
- #endif /* CONFIG_NFS_V4_1 */
- };
- /*
- * Define NFS4 callback procedures
- */
- static struct svc_procedure nfs4_callback_procedures1[] = {
- [CB_NULL] = {
- .pc_func = nfs4_callback_null,
- .pc_decode = (kxdrproc_t)nfs4_decode_void,
- .pc_encode = (kxdrproc_t)nfs4_encode_void,
- .pc_xdrressize = 1,
- },
- [CB_COMPOUND] = {
- .pc_func = nfs4_callback_compound,
- .pc_encode = (kxdrproc_t)nfs4_encode_void,
- .pc_argsize = 256,
- .pc_ressize = 256,
- .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
- }
- };
- struct svc_version nfs4_callback_version1 = {
- .vs_vers = 1,
- .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
- .vs_proc = nfs4_callback_procedures1,
- .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
- .vs_dispatch = NULL,
- .vs_hidden = 1,
- };
- struct svc_version nfs4_callback_version4 = {
- .vs_vers = 4,
- .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
- .vs_proc = nfs4_callback_procedures1,
- .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
- .vs_dispatch = NULL,
- .vs_hidden = 1,
- };
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