// 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" #include "nfs4trace.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 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 = xdr_inline_decode(xdr, 4); if (unlikely(p == NULL)) return htonl(NFS4ERR_RESOURCE); fh->size = ntohl(*p); if (fh->size > NFS4_FHSIZE) return htonl(NFS4ERR_BADHANDLE); p = xdr_inline_decode(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 = xdr_inline_decode(xdr, 4); if (unlikely(p == NULL)) return htonl(NFS4ERR_RESOURCE); attrlen = ntohl(*p); p = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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; __be32 *p; __be32 status = 0; u32 tmp; int n, i; args->ndevs = 0; /* Num of device notifications */ p = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(xdr, sizeof(uint32_t)); if (unlikely(p == NULL)) goto out; rc_list->rcl_nrefcalls = ntohl(*p++); if (rc_list->rcl_nrefcalls) { p = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 = xdr_inline_decode(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 timespec64 *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 timespec64 *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 timespec64 *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, NULL); 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, NULL); 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) { trace_nfs_cb_no_clp(rqstp->rq_xid, hdr_arg.cb_ident); goto out_invalidcred; } if (!check_gss_callback_principal(cps.clp, rqstp)) { trace_nfs_cb_badprinc(rqstp->rq_xid, hdr_arg.cb_ident); 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, .pc_name = "NULL", }, [CB_COMPOUND] = { .pc_func = nfs4_callback_compound, .pc_encode = nfs4_encode_void, .pc_argsize = 256, .pc_ressize = 256, .pc_xdrressize = NFS4_CALLBACK_BUFSIZE, .pc_name = "COMPOUND", } }; 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, };