diff options
Diffstat (limited to 'fs/nfs/callback_xdr.c')
| -rw-r--r-- | fs/nfs/callback_xdr.c | 1094 |
1 files changed, 1094 insertions, 0 deletions
diff --git a/fs/nfs/callback_xdr.c b/fs/nfs/callback_xdr.c new file mode 100644 index 000000000..2f84c6128 --- /dev/null +++ b/fs/nfs/callback_xdr.c @@ -0,0 +1,1094 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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) +#define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) +#endif /* CONFIG_NFS_V4_1 */ +#ifdef CONFIG_NFS_V4_2 +#define CB_OP_OFFLOAD_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ) +#endif /* CONFIG_NFS_V4_2 */ + +#define NFSDBG_FACILITY NFSDBG_CALLBACK + +/* Internal error code */ +#define NFS4ERR_RESOURCE_HDR 11050 + +struct callback_op { + __be32 (*process_op)(void *, void *, struct cb_process_state *); + __be32 (*decode_args)(struct svc_rqst *, struct xdr_stream *, void *); + __be32 (*encode_res)(struct svc_rqst *, struct xdr_stream *, + const void *); + long res_maxsize; +}; + +static struct callback_op callback_ops[]; + +static __be32 nfs4_callback_null(struct svc_rqst *rqstp) +{ + return htonl(NFS4_OK); +} + +static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p) +{ + return xdr_argsize_check(rqstp, p); +} + +static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p) +{ + return xdr_ressize_check(rqstp, p); +} + +static __be32 *read_buf(struct xdr_stream *xdr, size_t 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, size_t maxlen) +{ + ssize_t err; + + err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen); + if (err < 0) + return cpu_to_be32(NFS4ERR_RESOURCE); + *len = err; + 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->data, p, NFS4_STATEID_SIZE); + return 0; +} + +static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) +{ + stateid->type = NFS4_DELEGATION_STATEID_TYPE; + return decode_stateid(xdr, stateid); +} + +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, CB_OP_TAGLEN_MAXSZ); + if (unlikely(status != 0)) + return status; + 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); + 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, void *argp) +{ + struct cb_getattrargs *args = argp; + __be32 status; + + status = decode_fh(xdr, &args->fh); + if (unlikely(status != 0)) + return status; + return decode_bitmap(xdr, args->bitmap); +} + +static __be32 decode_recall_args(struct svc_rqst *rqstp, + struct xdr_stream *xdr, void *argp) +{ + struct cb_recallargs *args = argp; + __be32 *p; + __be32 status; + + status = decode_delegation_stateid(xdr, &args->stateid); + if (unlikely(status != 0)) + return status; + p = read_buf(xdr, 4); + if (unlikely(p == NULL)) + return htonl(NFS4ERR_RESOURCE); + args->truncate = ntohl(*p); + return decode_fh(xdr, &args->fh); +} + +#if defined(CONFIG_NFS_V4_1) +static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid) +{ + stateid->type = NFS4_LAYOUT_STATEID_TYPE; + return decode_stateid(xdr, stateid); +} + +static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp, + struct xdr_stream *xdr, void *argp) +{ + struct cb_layoutrecallargs *args = argp; + __be32 *p; + __be32 status = 0; + uint32_t iomode; + + p = read_buf(xdr, 4 * sizeof(uint32_t)); + if (unlikely(p == NULL)) + return htonl(NFS4ERR_BADXDR); + + 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)) + return status; + + p = read_buf(xdr, 2 * sizeof(uint64_t)); + if (unlikely(p == NULL)) + return htonl(NFS4ERR_BADXDR); + p = xdr_decode_hyper(p, &args->cbl_range.offset); + p = xdr_decode_hyper(p, &args->cbl_range.length); + return decode_layout_stateid(xdr, &args->cbl_stateid); + } else if (args->cbl_recall_type == RETURN_FSID) { + p = read_buf(xdr, 2 * sizeof(uint64_t)); + if (unlikely(p == NULL)) + return htonl(NFS4ERR_BADXDR); + 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) + return htonl(NFS4ERR_BADXDR); + return 0; +} + +static +__be32 decode_devicenotify_args(struct svc_rqst *rqstp, + struct xdr_stream *xdr, + void *argp) +{ + struct cb_devicenotifyargs *args = argp; + uint32_t tmp, n, i; + __be32 *p; + __be32 status = 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; + + 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; + } + + dprintk("%s: type %d layout 0x%x immediate %d\n", + __func__, dev->cbd_notify_type, dev->cbd_layout_type, + dev->cbd_immediate); + } + args->ndevs = n; + dprintk("%s: ndevs %d\n", __func__, args->ndevs); + return 0; +err: + kfree(args->devs); +out: + args->devs = NULL; + args->ndevs = 0; + dprintk("%s: status %d ndevs %d\n", + __func__, ntohl(status), args->ndevs); + return status; +} + +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, + void *argp) +{ + struct cb_sequenceargs *args = argp; + __be32 *p; + int i; + __be32 status; + + status = decode_sessionid(xdr, &args->csa_sessionid); + if (status) + return status; + + p = read_buf(xdr, 5 * sizeof(uint32_t)); + if (unlikely(p == NULL)) + return htonl(NFS4ERR_RESOURCE); + + 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)) + return htonl(NFS4ERR_RESOURCE); + + 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; + } + } + } + return 0; + +out_free: + for (i = 0; i < args->csa_nrclists; i++) + kfree(args->csa_rclists[i].rcl_refcalls); + kfree(args->csa_rclists); + return status; +} + +static __be32 decode_recallany_args(struct svc_rqst *rqstp, + struct xdr_stream *xdr, + void *argp) +{ + struct cb_recallanyargs *args = argp; + 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, + void *argp) +{ + struct cb_recallslotargs *args = argp; + __be32 *p; + + p = read_buf(xdr, 4); + if (unlikely(p == NULL)) + return htonl(NFS4ERR_BADXDR); + args->crsa_target_highest_slotid = ntohl(*p++); + return 0; +} + +static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args) +{ + __be32 *p; + unsigned int len; + + p = read_buf(xdr, 12); + if (unlikely(p == NULL)) + return htonl(NFS4ERR_BADXDR); + + p = xdr_decode_hyper(p, &args->cbnl_owner.clientid); + len = be32_to_cpu(*p); + + p = read_buf(xdr, len); + if (unlikely(p == NULL)) + return htonl(NFS4ERR_BADXDR); + + /* Only try to decode if the length is right */ + if (len == 20) { + p += 2; /* skip "lock id:" */ + args->cbnl_owner.s_dev = be32_to_cpu(*p++); + xdr_decode_hyper(p, &args->cbnl_owner.id); + args->cbnl_valid = true; + } else { + args->cbnl_owner.s_dev = 0; + args->cbnl_owner.id = 0; + args->cbnl_valid = false; + } + return 0; +} + +static __be32 decode_notify_lock_args(struct svc_rqst *rqstp, + struct xdr_stream *xdr, void *argp) +{ + struct cb_notify_lock_args *args = argp; + __be32 status; + + status = decode_fh(xdr, &args->cbnl_fh); + if (unlikely(status != 0)) + return status; + return decode_lockowner(xdr, args); +} + +#endif /* CONFIG_NFS_V4_1 */ +#ifdef CONFIG_NFS_V4_2 +static __be32 decode_write_response(struct xdr_stream *xdr, + struct cb_offloadargs *args) +{ + __be32 *p; + + /* skip the always zero field */ + p = read_buf(xdr, 4); + if (unlikely(!p)) + goto out; + p++; + + /* decode count, stable_how, verifier */ + p = xdr_inline_decode(xdr, 8 + 4); + if (unlikely(!p)) + goto out; + p = xdr_decode_hyper(p, &args->wr_count); + args->wr_writeverf.committed = be32_to_cpup(p); + p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE); + if (likely(p)) { + memcpy(&args->wr_writeverf.verifier.data[0], p, + NFS4_VERIFIER_SIZE); + return 0; + } +out: + return htonl(NFS4ERR_RESOURCE); +} + +static __be32 decode_offload_args(struct svc_rqst *rqstp, + struct xdr_stream *xdr, + void *data) +{ + struct cb_offloadargs *args = data; + __be32 *p; + __be32 status; + + /* decode fh */ + status = decode_fh(xdr, &args->coa_fh); + if (unlikely(status != 0)) + return status; + + /* decode stateid */ + status = decode_stateid(xdr, &args->coa_stateid); + if (unlikely(status != 0)) + return status; + + /* decode status */ + p = read_buf(xdr, 4); + if (unlikely(!p)) + goto out; + args->error = ntohl(*p++); + if (!args->error) { + status = decode_write_response(xdr, args); + if (unlikely(status != 0)) + return status; + } else { + p = xdr_inline_decode(xdr, 8); + if (unlikely(!p)) + goto out; + p = xdr_decode_hyper(p, &args->wr_count); + } + return 0; +out: + return htonl(NFS4ERR_RESOURCE); +} +#endif /* CONFIG_NFS_V4_2 */ +static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str) +{ + if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0)) + return cpu_to_be32(NFS4ERR_RESOURCE); + return 0; +} + +static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz) +{ + if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0) + return cpu_to_be32(NFS4ERR_RESOURCE); + 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 void *resp) +{ + const struct cb_getattrres *res = resp; + __be32 *savep = NULL; + __be32 status = res->status; + + if (unlikely(status != 0)) + goto out; + status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap)); + if (unlikely(status != 0)) + goto out; + status = cpu_to_be32(NFS4ERR_RESOURCE); + savep = xdr_reserve_space(xdr, sizeof(*savep)); + if (unlikely(!savep)) + 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: + 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 void *resp) +{ + const struct cb_sequenceres *res = resp; + __be32 *p; + __be32 status = res->csr_status; + + if (unlikely(status != 0)) + return status; + + status = encode_sessionid(xdr, &res->csr_sessionid); + if (status) + return status; + + 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); + return 0; +} + +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: + case OP_CB_NOTIFY_LOCK: + *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: + 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 *slot) +{ + 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 + */ + nfs4_free_slot(tbl, slot); + spin_unlock(&tbl->slot_tbl_lock); +} + +static void nfs4_cb_free_slot(struct cb_process_state *cps) +{ + if (cps->slot) { + nfs4_callback_free_slot(cps->clp->cl_session, cps->slot); + cps->slot = NULL; + } +} + +#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) { + *op = &callback_ops[op_nr]; + return htonl(NFS_OK); + } else + 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; + + status = decode_op_hdr(xdr_in, &op_nr); + if (unlikely(status)) + return status; + + 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); + return status; +} + +/* + * Decode, process and encode a COMPOUND + */ +static __be32 nfs4_callback_compound(struct svc_rqst *rqstp) +{ + 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, + .net = SVC_NET(rqstp), + }; + unsigned int nops = 0; + + 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, + rqstp->rq_argp, &xdr_out, rqstp->rq_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); + return rpc_success; + +out_invalidcred: + pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n"); + return svc_return_autherr(rqstp, 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 = nfs4_callback_getattr, + .decode_args = decode_getattr_args, + .encode_res = encode_getattr_res, + .res_maxsize = CB_OP_GETATTR_RES_MAXSZ, + }, + [OP_CB_RECALL] = { + .process_op = nfs4_callback_recall, + .decode_args = decode_recall_args, + .res_maxsize = CB_OP_RECALL_RES_MAXSZ, + }, +#if defined(CONFIG_NFS_V4_1) + [OP_CB_LAYOUTRECALL] = { + .process_op = nfs4_callback_layoutrecall, + .decode_args = decode_layoutrecall_args, + .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ, + }, + [OP_CB_NOTIFY_DEVICEID] = { + .process_op = nfs4_callback_devicenotify, + .decode_args = decode_devicenotify_args, + .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ, + }, + [OP_CB_SEQUENCE] = { + .process_op = nfs4_callback_sequence, + .decode_args = decode_cb_sequence_args, + .encode_res = encode_cb_sequence_res, + .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ, + }, + [OP_CB_RECALL_ANY] = { + .process_op = nfs4_callback_recallany, + .decode_args = decode_recallany_args, + .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ, + }, + [OP_CB_RECALL_SLOT] = { + .process_op = nfs4_callback_recallslot, + .decode_args = decode_recallslot_args, + .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ, + }, + [OP_CB_NOTIFY_LOCK] = { + .process_op = nfs4_callback_notify_lock, + .decode_args = decode_notify_lock_args, + .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ, + }, +#endif /* CONFIG_NFS_V4_1 */ +#ifdef CONFIG_NFS_V4_2 + [OP_CB_OFFLOAD] = { + .process_op = nfs4_callback_offload, + .decode_args = decode_offload_args, + .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ, + }, +#endif /* CONFIG_NFS_V4_2 */ +}; + +/* + * Define NFS4 callback procedures + */ +static const struct svc_procedure nfs4_callback_procedures1[] = { + [CB_NULL] = { + .pc_func = nfs4_callback_null, + .pc_decode = nfs4_decode_void, + .pc_encode = nfs4_encode_void, + .pc_xdrressize = 1, + }, + [CB_COMPOUND] = { + .pc_func = nfs4_callback_compound, + .pc_encode = nfs4_encode_void, + .pc_argsize = 256, + .pc_ressize = 256, + .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, + } +}; + +static unsigned int nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)]; +const struct svc_version nfs4_callback_version1 = { + .vs_vers = 1, + .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), + .vs_proc = nfs4_callback_procedures1, + .vs_count = nfs4_callback_count1, + .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, + .vs_dispatch = NULL, + .vs_hidden = true, + .vs_need_cong_ctrl = true, +}; + +static unsigned int nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)]; +const struct svc_version nfs4_callback_version4 = { + .vs_vers = 4, + .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1), + .vs_proc = nfs4_callback_procedures1, + .vs_count = nfs4_callback_count4, + .vs_xdrsize = NFS4_CALLBACK_XDRSIZE, + .vs_dispatch = NULL, + .vs_hidden = true, + .vs_need_cong_ctrl = true, +}; |