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0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * linux/fs/nfs/callback_xdr.c
0004  *
0005  * Copyright (C) 2004 Trond Myklebust
0006  *
0007  * NFSv4 callback encode/decode procedures
0008  */
0009 #include <linux/kernel.h>
0010 #include <linux/sunrpc/svc.h>
0011 #include <linux/nfs4.h>
0012 #include <linux/nfs_fs.h>
0013 #include <linux/ratelimit.h>
0014 #include <linux/printk.h>
0015 #include <linux/slab.h>
0016 #include <linux/sunrpc/bc_xprt.h>
0017 #include "nfs4_fs.h"
0018 #include "callback.h"
0019 #include "internal.h"
0020 #include "nfs4session.h"
0021 #include "nfs4trace.h"
0022 
0023 #define CB_OP_TAGLEN_MAXSZ      (512)
0024 #define CB_OP_HDR_RES_MAXSZ     (2 * 4) // opcode, status
0025 #define CB_OP_GETATTR_BITMAP_MAXSZ  (4 * 4) // bitmap length, 3 bitmaps
0026 #define CB_OP_GETATTR_RES_MAXSZ     (CB_OP_HDR_RES_MAXSZ + \
0027                      CB_OP_GETATTR_BITMAP_MAXSZ + \
0028                      /* change, size, ctime, mtime */\
0029                      (2 + 2 + 3 + 3) * 4)
0030 #define CB_OP_RECALL_RES_MAXSZ      (CB_OP_HDR_RES_MAXSZ)
0031 
0032 #if defined(CONFIG_NFS_V4_1)
0033 #define CB_OP_LAYOUTRECALL_RES_MAXSZ    (CB_OP_HDR_RES_MAXSZ)
0034 #define CB_OP_DEVICENOTIFY_RES_MAXSZ    (CB_OP_HDR_RES_MAXSZ)
0035 #define CB_OP_SEQUENCE_RES_MAXSZ    (CB_OP_HDR_RES_MAXSZ + \
0036                      NFS4_MAX_SESSIONID_LEN + \
0037                      (1 + 3) * 4) // seqid, 3 slotids
0038 #define CB_OP_RECALLANY_RES_MAXSZ   (CB_OP_HDR_RES_MAXSZ)
0039 #define CB_OP_RECALLSLOT_RES_MAXSZ  (CB_OP_HDR_RES_MAXSZ)
0040 #define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
0041 #endif /* CONFIG_NFS_V4_1 */
0042 #ifdef CONFIG_NFS_V4_2
0043 #define CB_OP_OFFLOAD_RES_MAXSZ     (CB_OP_HDR_RES_MAXSZ)
0044 #endif /* CONFIG_NFS_V4_2 */
0045 
0046 #define NFSDBG_FACILITY NFSDBG_CALLBACK
0047 
0048 /* Internal error code */
0049 #define NFS4ERR_RESOURCE_HDR    11050
0050 
0051 struct callback_op {
0052     __be32 (*process_op)(void *, void *, struct cb_process_state *);
0053     __be32 (*decode_args)(struct svc_rqst *, struct xdr_stream *, void *);
0054     __be32 (*encode_res)(struct svc_rqst *, struct xdr_stream *,
0055             const void *);
0056     long res_maxsize;
0057 };
0058 
0059 static struct callback_op callback_ops[];
0060 
0061 static __be32 nfs4_callback_null(struct svc_rqst *rqstp)
0062 {
0063     return htonl(NFS4_OK);
0064 }
0065 
0066 /*
0067  * svc_process_common() looks for an XDR encoder to know when
0068  * not to drop a Reply.
0069  */
0070 static bool nfs4_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
0071 {
0072     return true;
0073 }
0074 
0075 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len,
0076         const char **str, size_t maxlen)
0077 {
0078     ssize_t err;
0079 
0080     err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen);
0081     if (err < 0)
0082         return cpu_to_be32(NFS4ERR_RESOURCE);
0083     *len = err;
0084     return 0;
0085 }
0086 
0087 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
0088 {
0089     __be32 *p;
0090 
0091     p = xdr_inline_decode(xdr, 4);
0092     if (unlikely(p == NULL))
0093         return htonl(NFS4ERR_RESOURCE);
0094     fh->size = ntohl(*p);
0095     if (fh->size > NFS4_FHSIZE)
0096         return htonl(NFS4ERR_BADHANDLE);
0097     p = xdr_inline_decode(xdr, fh->size);
0098     if (unlikely(p == NULL))
0099         return htonl(NFS4ERR_RESOURCE);
0100     memcpy(&fh->data[0], p, fh->size);
0101     memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
0102     return 0;
0103 }
0104 
0105 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
0106 {
0107     __be32 *p;
0108     unsigned int attrlen;
0109 
0110     p = xdr_inline_decode(xdr, 4);
0111     if (unlikely(p == NULL))
0112         return htonl(NFS4ERR_RESOURCE);
0113     attrlen = ntohl(*p);
0114     p = xdr_inline_decode(xdr, attrlen << 2);
0115     if (unlikely(p == NULL))
0116         return htonl(NFS4ERR_RESOURCE);
0117     if (likely(attrlen > 0))
0118         bitmap[0] = ntohl(*p++);
0119     if (attrlen > 1)
0120         bitmap[1] = ntohl(*p);
0121     return 0;
0122 }
0123 
0124 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
0125 {
0126     __be32 *p;
0127 
0128     p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
0129     if (unlikely(p == NULL))
0130         return htonl(NFS4ERR_RESOURCE);
0131     memcpy(stateid->data, p, NFS4_STATEID_SIZE);
0132     return 0;
0133 }
0134 
0135 static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
0136 {
0137     stateid->type = NFS4_DELEGATION_STATEID_TYPE;
0138     return decode_stateid(xdr, stateid);
0139 }
0140 
0141 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
0142 {
0143     __be32 *p;
0144     __be32 status;
0145 
0146     status = decode_string(xdr, &hdr->taglen, &hdr->tag, CB_OP_TAGLEN_MAXSZ);
0147     if (unlikely(status != 0))
0148         return status;
0149     p = xdr_inline_decode(xdr, 12);
0150     if (unlikely(p == NULL))
0151         return htonl(NFS4ERR_RESOURCE);
0152     hdr->minorversion = ntohl(*p++);
0153     /* Check for minor version support */
0154     if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
0155         hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
0156     } else {
0157         pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
0158             "illegal minor version %u!\n",
0159             __func__, hdr->minorversion);
0160         return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
0161     }
0162     hdr->nops = ntohl(*p);
0163     return 0;
0164 }
0165 
0166 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
0167 {
0168     __be32 *p;
0169     p = xdr_inline_decode(xdr, 4);
0170     if (unlikely(p == NULL))
0171         return htonl(NFS4ERR_RESOURCE_HDR);
0172     *op = ntohl(*p);
0173     return 0;
0174 }
0175 
0176 static __be32 decode_getattr_args(struct svc_rqst *rqstp,
0177         struct xdr_stream *xdr, void *argp)
0178 {
0179     struct cb_getattrargs *args = argp;
0180     __be32 status;
0181 
0182     status = decode_fh(xdr, &args->fh);
0183     if (unlikely(status != 0))
0184         return status;
0185     return decode_bitmap(xdr, args->bitmap);
0186 }
0187 
0188 static __be32 decode_recall_args(struct svc_rqst *rqstp,
0189         struct xdr_stream *xdr, void *argp)
0190 {
0191     struct cb_recallargs *args = argp;
0192     __be32 *p;
0193     __be32 status;
0194 
0195     status = decode_delegation_stateid(xdr, &args->stateid);
0196     if (unlikely(status != 0))
0197         return status;
0198     p = xdr_inline_decode(xdr, 4);
0199     if (unlikely(p == NULL))
0200         return htonl(NFS4ERR_RESOURCE);
0201     args->truncate = ntohl(*p);
0202     return decode_fh(xdr, &args->fh);
0203 }
0204 
0205 #if defined(CONFIG_NFS_V4_1)
0206 static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
0207 {
0208     stateid->type = NFS4_LAYOUT_STATEID_TYPE;
0209     return decode_stateid(xdr, stateid);
0210 }
0211 
0212 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
0213                        struct xdr_stream *xdr, void *argp)
0214 {
0215     struct cb_layoutrecallargs *args = argp;
0216     __be32 *p;
0217     __be32 status = 0;
0218     uint32_t iomode;
0219 
0220     p = xdr_inline_decode(xdr, 4 * sizeof(uint32_t));
0221     if (unlikely(p == NULL))
0222         return htonl(NFS4ERR_BADXDR);
0223 
0224     args->cbl_layout_type = ntohl(*p++);
0225     /* Depite the spec's xdr, iomode really belongs in the FILE switch,
0226      * as it is unusable and ignored with the other types.
0227      */
0228     iomode = ntohl(*p++);
0229     args->cbl_layoutchanged = ntohl(*p++);
0230     args->cbl_recall_type = ntohl(*p++);
0231 
0232     if (args->cbl_recall_type == RETURN_FILE) {
0233         args->cbl_range.iomode = iomode;
0234         status = decode_fh(xdr, &args->cbl_fh);
0235         if (unlikely(status != 0))
0236             return status;
0237 
0238         p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t));
0239         if (unlikely(p == NULL))
0240             return htonl(NFS4ERR_BADXDR);
0241         p = xdr_decode_hyper(p, &args->cbl_range.offset);
0242         p = xdr_decode_hyper(p, &args->cbl_range.length);
0243         return decode_layout_stateid(xdr, &args->cbl_stateid);
0244     } else if (args->cbl_recall_type == RETURN_FSID) {
0245         p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t));
0246         if (unlikely(p == NULL))
0247             return htonl(NFS4ERR_BADXDR);
0248         p = xdr_decode_hyper(p, &args->cbl_fsid.major);
0249         p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
0250     } else if (args->cbl_recall_type != RETURN_ALL)
0251         return htonl(NFS4ERR_BADXDR);
0252     return 0;
0253 }
0254 
0255 static
0256 __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
0257                 struct xdr_stream *xdr,
0258                 void *argp)
0259 {
0260     struct cb_devicenotifyargs *args = argp;
0261     uint32_t tmp, n, i;
0262     __be32 *p;
0263     __be32 status = 0;
0264 
0265     /* Num of device notifications */
0266     p = xdr_inline_decode(xdr, sizeof(uint32_t));
0267     if (unlikely(p == NULL)) {
0268         status = htonl(NFS4ERR_BADXDR);
0269         goto out;
0270     }
0271     n = ntohl(*p++);
0272     if (n == 0)
0273         goto out;
0274 
0275     args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
0276     if (!args->devs) {
0277         status = htonl(NFS4ERR_DELAY);
0278         goto out;
0279     }
0280 
0281     /* Decode each dev notification */
0282     for (i = 0; i < n; i++) {
0283         struct cb_devicenotifyitem *dev = &args->devs[i];
0284 
0285         p = xdr_inline_decode(xdr, (4 * sizeof(uint32_t)) +
0286                       NFS4_DEVICEID4_SIZE);
0287         if (unlikely(p == NULL)) {
0288             status = htonl(NFS4ERR_BADXDR);
0289             goto err;
0290         }
0291 
0292         tmp = ntohl(*p++);  /* bitmap size */
0293         if (tmp != 1) {
0294             status = htonl(NFS4ERR_INVAL);
0295             goto err;
0296         }
0297         dev->cbd_notify_type = ntohl(*p++);
0298         if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
0299             dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
0300             status = htonl(NFS4ERR_INVAL);
0301             goto err;
0302         }
0303 
0304         tmp = ntohl(*p++);  /* opaque size */
0305         if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
0306              (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
0307             ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
0308              (tmp != NFS4_DEVICEID4_SIZE + 4))) {
0309             status = htonl(NFS4ERR_INVAL);
0310             goto err;
0311         }
0312         dev->cbd_layout_type = ntohl(*p++);
0313         memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
0314         p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
0315 
0316         if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
0317             p = xdr_inline_decode(xdr, sizeof(uint32_t));
0318             if (unlikely(p == NULL)) {
0319                 status = htonl(NFS4ERR_BADXDR);
0320                 goto err;
0321             }
0322             dev->cbd_immediate = ntohl(*p++);
0323         } else {
0324             dev->cbd_immediate = 0;
0325         }
0326 
0327         dprintk("%s: type %d layout 0x%x immediate %d\n",
0328             __func__, dev->cbd_notify_type, dev->cbd_layout_type,
0329             dev->cbd_immediate);
0330     }
0331     args->ndevs = n;
0332     dprintk("%s: ndevs %d\n", __func__, args->ndevs);
0333     return 0;
0334 err:
0335     kfree(args->devs);
0336 out:
0337     args->devs = NULL;
0338     args->ndevs = 0;
0339     dprintk("%s: status %d ndevs %d\n",
0340         __func__, ntohl(status), args->ndevs);
0341     return status;
0342 }
0343 
0344 static __be32 decode_sessionid(struct xdr_stream *xdr,
0345                  struct nfs4_sessionid *sid)
0346 {
0347     __be32 *p;
0348 
0349     p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN);
0350     if (unlikely(p == NULL))
0351         return htonl(NFS4ERR_RESOURCE);
0352 
0353     memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
0354     return 0;
0355 }
0356 
0357 static __be32 decode_rc_list(struct xdr_stream *xdr,
0358                    struct referring_call_list *rc_list)
0359 {
0360     __be32 *p;
0361     int i;
0362     __be32 status;
0363 
0364     status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
0365     if (status)
0366         goto out;
0367 
0368     status = htonl(NFS4ERR_RESOURCE);
0369     p = xdr_inline_decode(xdr, sizeof(uint32_t));
0370     if (unlikely(p == NULL))
0371         goto out;
0372 
0373     rc_list->rcl_nrefcalls = ntohl(*p++);
0374     if (rc_list->rcl_nrefcalls) {
0375         p = xdr_inline_decode(xdr,
0376                  rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
0377         if (unlikely(p == NULL))
0378             goto out;
0379         rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
0380                         sizeof(*rc_list->rcl_refcalls),
0381                         GFP_KERNEL);
0382         if (unlikely(rc_list->rcl_refcalls == NULL))
0383             goto out;
0384         for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
0385             rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
0386             rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
0387         }
0388     }
0389     status = 0;
0390 
0391 out:
0392     return status;
0393 }
0394 
0395 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
0396                     struct xdr_stream *xdr,
0397                     void *argp)
0398 {
0399     struct cb_sequenceargs *args = argp;
0400     __be32 *p;
0401     int i;
0402     __be32 status;
0403 
0404     status = decode_sessionid(xdr, &args->csa_sessionid);
0405     if (status)
0406         return status;
0407 
0408     p = xdr_inline_decode(xdr, 5 * sizeof(uint32_t));
0409     if (unlikely(p == NULL))
0410         return htonl(NFS4ERR_RESOURCE);
0411 
0412     args->csa_addr = svc_addr(rqstp);
0413     args->csa_sequenceid = ntohl(*p++);
0414     args->csa_slotid = ntohl(*p++);
0415     args->csa_highestslotid = ntohl(*p++);
0416     args->csa_cachethis = ntohl(*p++);
0417     args->csa_nrclists = ntohl(*p++);
0418     args->csa_rclists = NULL;
0419     if (args->csa_nrclists) {
0420         args->csa_rclists = kmalloc_array(args->csa_nrclists,
0421                           sizeof(*args->csa_rclists),
0422                           GFP_KERNEL);
0423         if (unlikely(args->csa_rclists == NULL))
0424             return htonl(NFS4ERR_RESOURCE);
0425 
0426         for (i = 0; i < args->csa_nrclists; i++) {
0427             status = decode_rc_list(xdr, &args->csa_rclists[i]);
0428             if (status) {
0429                 args->csa_nrclists = i;
0430                 goto out_free;
0431             }
0432         }
0433     }
0434     return 0;
0435 
0436 out_free:
0437     for (i = 0; i < args->csa_nrclists; i++)
0438         kfree(args->csa_rclists[i].rcl_refcalls);
0439     kfree(args->csa_rclists);
0440     return status;
0441 }
0442 
0443 static __be32 decode_recallany_args(struct svc_rqst *rqstp,
0444                       struct xdr_stream *xdr,
0445                       void *argp)
0446 {
0447     struct cb_recallanyargs *args = argp;
0448     uint32_t bitmap[2];
0449     __be32 *p, status;
0450 
0451     p = xdr_inline_decode(xdr, 4);
0452     if (unlikely(p == NULL))
0453         return htonl(NFS4ERR_BADXDR);
0454     args->craa_objs_to_keep = ntohl(*p++);
0455     status = decode_bitmap(xdr, bitmap);
0456     if (unlikely(status))
0457         return status;
0458     args->craa_type_mask = bitmap[0];
0459 
0460     return 0;
0461 }
0462 
0463 static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
0464                     struct xdr_stream *xdr,
0465                     void *argp)
0466 {
0467     struct cb_recallslotargs *args = argp;
0468     __be32 *p;
0469 
0470     p = xdr_inline_decode(xdr, 4);
0471     if (unlikely(p == NULL))
0472         return htonl(NFS4ERR_BADXDR);
0473     args->crsa_target_highest_slotid = ntohl(*p++);
0474     return 0;
0475 }
0476 
0477 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args)
0478 {
0479     __be32      *p;
0480     unsigned int    len;
0481 
0482     p = xdr_inline_decode(xdr, 12);
0483     if (unlikely(p == NULL))
0484         return htonl(NFS4ERR_BADXDR);
0485 
0486     p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
0487     len = be32_to_cpu(*p);
0488 
0489     p = xdr_inline_decode(xdr, len);
0490     if (unlikely(p == NULL))
0491         return htonl(NFS4ERR_BADXDR);
0492 
0493     /* Only try to decode if the length is right */
0494     if (len == 20) {
0495         p += 2; /* skip "lock id:" */
0496         args->cbnl_owner.s_dev = be32_to_cpu(*p++);
0497         xdr_decode_hyper(p, &args->cbnl_owner.id);
0498         args->cbnl_valid = true;
0499     } else {
0500         args->cbnl_owner.s_dev = 0;
0501         args->cbnl_owner.id = 0;
0502         args->cbnl_valid = false;
0503     }
0504     return 0;
0505 }
0506 
0507 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp,
0508         struct xdr_stream *xdr, void *argp)
0509 {
0510     struct cb_notify_lock_args *args = argp;
0511     __be32 status;
0512 
0513     status = decode_fh(xdr, &args->cbnl_fh);
0514     if (unlikely(status != 0))
0515         return status;
0516     return decode_lockowner(xdr, args);
0517 }
0518 
0519 #endif /* CONFIG_NFS_V4_1 */
0520 #ifdef CONFIG_NFS_V4_2
0521 static __be32 decode_write_response(struct xdr_stream *xdr,
0522                     struct cb_offloadargs *args)
0523 {
0524     __be32 *p;
0525 
0526     /* skip the always zero field */
0527     p = xdr_inline_decode(xdr, 4);
0528     if (unlikely(!p))
0529         goto out;
0530     p++;
0531 
0532     /* decode count, stable_how, verifier */
0533     p = xdr_inline_decode(xdr, 8 + 4);
0534     if (unlikely(!p))
0535         goto out;
0536     p = xdr_decode_hyper(p, &args->wr_count);
0537     args->wr_writeverf.committed = be32_to_cpup(p);
0538     p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE);
0539     if (likely(p)) {
0540         memcpy(&args->wr_writeverf.verifier.data[0], p,
0541             NFS4_VERIFIER_SIZE);
0542         return 0;
0543     }
0544 out:
0545     return htonl(NFS4ERR_RESOURCE);
0546 }
0547 
0548 static __be32 decode_offload_args(struct svc_rqst *rqstp,
0549                     struct xdr_stream *xdr,
0550                     void *data)
0551 {
0552     struct cb_offloadargs *args = data;
0553     __be32 *p;
0554     __be32 status;
0555 
0556     /* decode fh */
0557     status = decode_fh(xdr, &args->coa_fh);
0558     if (unlikely(status != 0))
0559         return status;
0560 
0561     /* decode stateid */
0562     status = decode_stateid(xdr, &args->coa_stateid);
0563     if (unlikely(status != 0))
0564         return status;
0565 
0566     /* decode status */
0567     p = xdr_inline_decode(xdr, 4);
0568     if (unlikely(!p))
0569         goto out;
0570     args->error = ntohl(*p++);
0571     if (!args->error) {
0572         status = decode_write_response(xdr, args);
0573         if (unlikely(status != 0))
0574             return status;
0575     } else {
0576         p = xdr_inline_decode(xdr, 8);
0577         if (unlikely(!p))
0578             goto out;
0579         p = xdr_decode_hyper(p, &args->wr_count);
0580     }
0581     return 0;
0582 out:
0583     return htonl(NFS4ERR_RESOURCE);
0584 }
0585 #endif /* CONFIG_NFS_V4_2 */
0586 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
0587 {
0588     if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0))
0589         return cpu_to_be32(NFS4ERR_RESOURCE);
0590     return 0;
0591 }
0592 
0593 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz)
0594 {
0595     if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0)
0596         return cpu_to_be32(NFS4ERR_RESOURCE);
0597     return 0;
0598 }
0599 
0600 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
0601 {
0602     __be32 *p;
0603 
0604     if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
0605         return 0;
0606     p = xdr_reserve_space(xdr, 8);
0607     if (unlikely(!p))
0608         return htonl(NFS4ERR_RESOURCE);
0609     p = xdr_encode_hyper(p, change);
0610     return 0;
0611 }
0612 
0613 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
0614 {
0615     __be32 *p;
0616 
0617     if (!(bitmap[0] & FATTR4_WORD0_SIZE))
0618         return 0;
0619     p = xdr_reserve_space(xdr, 8);
0620     if (unlikely(!p))
0621         return htonl(NFS4ERR_RESOURCE);
0622     p = xdr_encode_hyper(p, size);
0623     return 0;
0624 }
0625 
0626 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec64 *time)
0627 {
0628     __be32 *p;
0629 
0630     p = xdr_reserve_space(xdr, 12);
0631     if (unlikely(!p))
0632         return htonl(NFS4ERR_RESOURCE);
0633     p = xdr_encode_hyper(p, time->tv_sec);
0634     *p = htonl(time->tv_nsec);
0635     return 0;
0636 }
0637 
0638 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
0639 {
0640     if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
0641         return 0;
0642     return encode_attr_time(xdr,time);
0643 }
0644 
0645 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
0646 {
0647     if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
0648         return 0;
0649     return encode_attr_time(xdr,time);
0650 }
0651 
0652 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
0653 {
0654     __be32 status;
0655 
0656     hdr->status = xdr_reserve_space(xdr, 4);
0657     if (unlikely(hdr->status == NULL))
0658         return htonl(NFS4ERR_RESOURCE);
0659     status = encode_string(xdr, hdr->taglen, hdr->tag);
0660     if (unlikely(status != 0))
0661         return status;
0662     hdr->nops = xdr_reserve_space(xdr, 4);
0663     if (unlikely(hdr->nops == NULL))
0664         return htonl(NFS4ERR_RESOURCE);
0665     return 0;
0666 }
0667 
0668 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
0669 {
0670     __be32 *p;
0671     
0672     p = xdr_reserve_space(xdr, 8);
0673     if (unlikely(p == NULL))
0674         return htonl(NFS4ERR_RESOURCE_HDR);
0675     *p++ = htonl(op);
0676     *p = res;
0677     return 0;
0678 }
0679 
0680 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr,
0681         const void *resp)
0682 {
0683     const struct cb_getattrres *res = resp;
0684     __be32 *savep = NULL;
0685     __be32 status = res->status;
0686     
0687     if (unlikely(status != 0))
0688         goto out;
0689     status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap));
0690     if (unlikely(status != 0))
0691         goto out;
0692     status = cpu_to_be32(NFS4ERR_RESOURCE);
0693     savep = xdr_reserve_space(xdr, sizeof(*savep));
0694     if (unlikely(!savep))
0695         goto out;
0696     status = encode_attr_change(xdr, res->bitmap, res->change_attr);
0697     if (unlikely(status != 0))
0698         goto out;
0699     status = encode_attr_size(xdr, res->bitmap, res->size);
0700     if (unlikely(status != 0))
0701         goto out;
0702     status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
0703     if (unlikely(status != 0))
0704         goto out;
0705     status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
0706     *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
0707 out:
0708     return status;
0709 }
0710 
0711 #if defined(CONFIG_NFS_V4_1)
0712 
0713 static __be32 encode_sessionid(struct xdr_stream *xdr,
0714                  const struct nfs4_sessionid *sid)
0715 {
0716     __be32 *p;
0717 
0718     p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
0719     if (unlikely(p == NULL))
0720         return htonl(NFS4ERR_RESOURCE);
0721 
0722     memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
0723     return 0;
0724 }
0725 
0726 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
0727                        struct xdr_stream *xdr,
0728                        const void *resp)
0729 {
0730     const struct cb_sequenceres *res = resp;
0731     __be32 *p;
0732     __be32 status = res->csr_status;
0733 
0734     if (unlikely(status != 0))
0735         return status;
0736 
0737     status = encode_sessionid(xdr, &res->csr_sessionid);
0738     if (status)
0739         return status;
0740 
0741     p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
0742     if (unlikely(p == NULL))
0743         return htonl(NFS4ERR_RESOURCE);
0744 
0745     *p++ = htonl(res->csr_sequenceid);
0746     *p++ = htonl(res->csr_slotid);
0747     *p++ = htonl(res->csr_highestslotid);
0748     *p++ = htonl(res->csr_target_highestslotid);
0749     return 0;
0750 }
0751 
0752 static __be32
0753 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
0754 {
0755     if (op_nr == OP_CB_SEQUENCE) {
0756         if (nop != 0)
0757             return htonl(NFS4ERR_SEQUENCE_POS);
0758     } else {
0759         if (nop == 0)
0760             return htonl(NFS4ERR_OP_NOT_IN_SESSION);
0761     }
0762 
0763     switch (op_nr) {
0764     case OP_CB_GETATTR:
0765     case OP_CB_RECALL:
0766     case OP_CB_SEQUENCE:
0767     case OP_CB_RECALL_ANY:
0768     case OP_CB_RECALL_SLOT:
0769     case OP_CB_LAYOUTRECALL:
0770     case OP_CB_NOTIFY_DEVICEID:
0771     case OP_CB_NOTIFY_LOCK:
0772         *op = &callback_ops[op_nr];
0773         break;
0774 
0775     case OP_CB_NOTIFY:
0776     case OP_CB_PUSH_DELEG:
0777     case OP_CB_RECALLABLE_OBJ_AVAIL:
0778     case OP_CB_WANTS_CANCELLED:
0779         return htonl(NFS4ERR_NOTSUPP);
0780 
0781     default:
0782         return htonl(NFS4ERR_OP_ILLEGAL);
0783     }
0784 
0785     return htonl(NFS_OK);
0786 }
0787 
0788 static void nfs4_callback_free_slot(struct nfs4_session *session,
0789         struct nfs4_slot *slot)
0790 {
0791     struct nfs4_slot_table *tbl = &session->bc_slot_table;
0792 
0793     spin_lock(&tbl->slot_tbl_lock);
0794     /*
0795      * Let the state manager know callback processing done.
0796      * A single slot, so highest used slotid is either 0 or -1
0797      */
0798     nfs4_free_slot(tbl, slot);
0799     spin_unlock(&tbl->slot_tbl_lock);
0800 }
0801 
0802 static void nfs4_cb_free_slot(struct cb_process_state *cps)
0803 {
0804     if (cps->slot) {
0805         nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
0806         cps->slot = NULL;
0807     }
0808 }
0809 
0810 #else /* CONFIG_NFS_V4_1 */
0811 
0812 static __be32
0813 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
0814 {
0815     return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
0816 }
0817 
0818 static void nfs4_cb_free_slot(struct cb_process_state *cps)
0819 {
0820 }
0821 #endif /* CONFIG_NFS_V4_1 */
0822 
0823 #ifdef CONFIG_NFS_V4_2
0824 static __be32
0825 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
0826 {
0827     __be32 status = preprocess_nfs41_op(nop, op_nr, op);
0828     if (status != htonl(NFS4ERR_OP_ILLEGAL))
0829         return status;
0830 
0831     if (op_nr == OP_CB_OFFLOAD) {
0832         *op = &callback_ops[op_nr];
0833         return htonl(NFS_OK);
0834     } else
0835         return htonl(NFS4ERR_NOTSUPP);
0836     return htonl(NFS4ERR_OP_ILLEGAL);
0837 }
0838 #else /* CONFIG_NFS_V4_2 */
0839 static __be32
0840 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
0841 {
0842     return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
0843 }
0844 #endif /* CONFIG_NFS_V4_2 */
0845 
0846 static __be32
0847 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
0848 {
0849     switch (op_nr) {
0850     case OP_CB_GETATTR:
0851     case OP_CB_RECALL:
0852         *op = &callback_ops[op_nr];
0853         break;
0854     default:
0855         return htonl(NFS4ERR_OP_ILLEGAL);
0856     }
0857 
0858     return htonl(NFS_OK);
0859 }
0860 
0861 static __be32 process_op(int nop, struct svc_rqst *rqstp,
0862              struct cb_process_state *cps)
0863 {
0864     struct xdr_stream *xdr_out = &rqstp->rq_res_stream;
0865     struct callback_op *op = &callback_ops[0];
0866     unsigned int op_nr;
0867     __be32 status;
0868     long maxlen;
0869     __be32 res;
0870 
0871     status = decode_op_hdr(&rqstp->rq_arg_stream, &op_nr);
0872     if (unlikely(status))
0873         return status;
0874 
0875     switch (cps->minorversion) {
0876     case 0:
0877         status = preprocess_nfs4_op(op_nr, &op);
0878         break;
0879     case 1:
0880         status = preprocess_nfs41_op(nop, op_nr, &op);
0881         break;
0882     case 2:
0883         status = preprocess_nfs42_op(nop, op_nr, &op);
0884         break;
0885     default:
0886         status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
0887     }
0888 
0889     if (status == htonl(NFS4ERR_OP_ILLEGAL))
0890         op_nr = OP_CB_ILLEGAL;
0891     if (status)
0892         goto encode_hdr;
0893 
0894     if (cps->drc_status) {
0895         status = cps->drc_status;
0896         goto encode_hdr;
0897     }
0898 
0899     maxlen = xdr_out->end - xdr_out->p;
0900     if (maxlen > 0 && maxlen < PAGE_SIZE) {
0901         status = op->decode_args(rqstp, &rqstp->rq_arg_stream,
0902                      rqstp->rq_argp);
0903         if (likely(status == 0))
0904             status = op->process_op(rqstp->rq_argp, rqstp->rq_resp,
0905                         cps);
0906     } else
0907         status = htonl(NFS4ERR_RESOURCE);
0908 
0909 encode_hdr:
0910     res = encode_op_hdr(xdr_out, op_nr, status);
0911     if (unlikely(res))
0912         return res;
0913     if (op->encode_res != NULL && status == 0)
0914         status = op->encode_res(rqstp, xdr_out, rqstp->rq_resp);
0915     return status;
0916 }
0917 
0918 /*
0919  * Decode, process and encode a COMPOUND
0920  */
0921 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp)
0922 {
0923     struct cb_compound_hdr_arg hdr_arg = { 0 };
0924     struct cb_compound_hdr_res hdr_res = { NULL };
0925     struct cb_process_state cps = {
0926         .drc_status = 0,
0927         .clp = NULL,
0928         .net = SVC_NET(rqstp),
0929     };
0930     unsigned int nops = 0;
0931     __be32 status;
0932 
0933     status = decode_compound_hdr_arg(&rqstp->rq_arg_stream, &hdr_arg);
0934     if (status == htonl(NFS4ERR_RESOURCE))
0935         return rpc_garbage_args;
0936 
0937     if (hdr_arg.minorversion == 0) {
0938         cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
0939         if (!cps.clp) {
0940             trace_nfs_cb_no_clp(rqstp->rq_xid, hdr_arg.cb_ident);
0941             goto out_invalidcred;
0942         }
0943         if (!check_gss_callback_principal(cps.clp, rqstp)) {
0944             trace_nfs_cb_badprinc(rqstp->rq_xid, hdr_arg.cb_ident);
0945             nfs_put_client(cps.clp);
0946             goto out_invalidcred;
0947         }
0948     }
0949 
0950     cps.minorversion = hdr_arg.minorversion;
0951     hdr_res.taglen = hdr_arg.taglen;
0952     hdr_res.tag = hdr_arg.tag;
0953     if (encode_compound_hdr_res(&rqstp->rq_res_stream, &hdr_res) != 0) {
0954         if (cps.clp)
0955             nfs_put_client(cps.clp);
0956         return rpc_system_err;
0957     }
0958     while (status == 0 && nops != hdr_arg.nops) {
0959         status = process_op(nops, rqstp, &cps);
0960         nops++;
0961     }
0962 
0963     /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
0964     * resource error in cb_compound status without returning op */
0965     if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
0966         status = htonl(NFS4ERR_RESOURCE);
0967         nops--;
0968     }
0969 
0970     *hdr_res.status = status;
0971     *hdr_res.nops = htonl(nops);
0972     nfs4_cb_free_slot(&cps);
0973     nfs_put_client(cps.clp);
0974     return rpc_success;
0975 
0976 out_invalidcred:
0977     pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
0978     rqstp->rq_auth_stat = rpc_autherr_badcred;
0979     return rpc_success;
0980 }
0981 
0982 static int
0983 nfs_callback_dispatch(struct svc_rqst *rqstp, __be32 *statp)
0984 {
0985     const struct svc_procedure *procp = rqstp->rq_procinfo;
0986 
0987     svcxdr_init_decode(rqstp);
0988     svcxdr_init_encode(rqstp);
0989 
0990     *statp = procp->pc_func(rqstp);
0991     return 1;
0992 }
0993 
0994 /*
0995  * Define NFS4 callback COMPOUND ops.
0996  */
0997 static struct callback_op callback_ops[] = {
0998     [0] = {
0999         .res_maxsize = CB_OP_HDR_RES_MAXSZ,
1000     },
1001     [OP_CB_GETATTR] = {
1002         .process_op = nfs4_callback_getattr,
1003         .decode_args = decode_getattr_args,
1004         .encode_res = encode_getattr_res,
1005         .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
1006     },
1007     [OP_CB_RECALL] = {
1008         .process_op = nfs4_callback_recall,
1009         .decode_args = decode_recall_args,
1010         .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
1011     },
1012 #if defined(CONFIG_NFS_V4_1)
1013     [OP_CB_LAYOUTRECALL] = {
1014         .process_op = nfs4_callback_layoutrecall,
1015         .decode_args = decode_layoutrecall_args,
1016         .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
1017     },
1018     [OP_CB_NOTIFY_DEVICEID] = {
1019         .process_op = nfs4_callback_devicenotify,
1020         .decode_args = decode_devicenotify_args,
1021         .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
1022     },
1023     [OP_CB_SEQUENCE] = {
1024         .process_op = nfs4_callback_sequence,
1025         .decode_args = decode_cb_sequence_args,
1026         .encode_res = encode_cb_sequence_res,
1027         .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
1028     },
1029     [OP_CB_RECALL_ANY] = {
1030         .process_op = nfs4_callback_recallany,
1031         .decode_args = decode_recallany_args,
1032         .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
1033     },
1034     [OP_CB_RECALL_SLOT] = {
1035         .process_op = nfs4_callback_recallslot,
1036         .decode_args = decode_recallslot_args,
1037         .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
1038     },
1039     [OP_CB_NOTIFY_LOCK] = {
1040         .process_op = nfs4_callback_notify_lock,
1041         .decode_args = decode_notify_lock_args,
1042         .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
1043     },
1044 #endif /* CONFIG_NFS_V4_1 */
1045 #ifdef CONFIG_NFS_V4_2
1046     [OP_CB_OFFLOAD] = {
1047         .process_op = nfs4_callback_offload,
1048         .decode_args = decode_offload_args,
1049         .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ,
1050     },
1051 #endif /* CONFIG_NFS_V4_2 */
1052 };
1053 
1054 /*
1055  * Define NFS4 callback procedures
1056  */
1057 static const struct svc_procedure nfs4_callback_procedures1[] = {
1058     [CB_NULL] = {
1059         .pc_func = nfs4_callback_null,
1060         .pc_encode = nfs4_encode_void,
1061         .pc_xdrressize = 1,
1062         .pc_name = "NULL",
1063     },
1064     [CB_COMPOUND] = {
1065         .pc_func = nfs4_callback_compound,
1066         .pc_encode = nfs4_encode_void,
1067         .pc_argsize = 256,
1068         .pc_ressize = 256,
1069         .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1070         .pc_name = "COMPOUND",
1071     }
1072 };
1073 
1074 static unsigned int nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)];
1075 const struct svc_version nfs4_callback_version1 = {
1076     .vs_vers = 1,
1077     .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1078     .vs_proc = nfs4_callback_procedures1,
1079     .vs_count = nfs4_callback_count1,
1080     .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1081     .vs_dispatch = nfs_callback_dispatch,
1082     .vs_hidden = true,
1083     .vs_need_cong_ctrl = true,
1084 };
1085 
1086 static unsigned int nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)];
1087 const struct svc_version nfs4_callback_version4 = {
1088     .vs_vers = 4,
1089     .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1090     .vs_proc = nfs4_callback_procedures1,
1091     .vs_count = nfs4_callback_count4,
1092     .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1093     .vs_dispatch = nfs_callback_dispatch,
1094     .vs_hidden = true,
1095     .vs_need_cong_ctrl = true,
1096 };
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