485 lines
12 KiB
C
485 lines
12 KiB
C
/*
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* linux/fs/nfs/callback_xdr.c
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*
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* Copyright (C) 2004 Trond Myklebust
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*
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* NFSv4 callback encode/decode procedures
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*/
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#include <linux/kernel.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/nfs4.h>
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#include <linux/nfs_fs.h>
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#include "nfs4_fs.h"
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#include "callback.h"
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#define CB_OP_TAGLEN_MAXSZ (512)
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#define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ)
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#define CB_OP_GETATTR_BITMAP_MAXSZ (4)
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#define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
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CB_OP_GETATTR_BITMAP_MAXSZ + \
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2 + 2 + 3 + 3)
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#define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
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#define NFSDBG_FACILITY NFSDBG_CALLBACK
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typedef __be32 (*callback_process_op_t)(void *, void *);
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typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
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typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
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struct callback_op {
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callback_process_op_t process_op;
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callback_decode_arg_t decode_args;
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callback_encode_res_t encode_res;
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long res_maxsize;
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};
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static struct callback_op callback_ops[];
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static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
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{
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return htonl(NFS4_OK);
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}
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static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
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{
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return xdr_argsize_check(rqstp, p);
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}
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static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
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{
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return xdr_ressize_check(rqstp, p);
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}
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static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
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{
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__be32 *p;
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p = xdr_inline_decode(xdr, nbytes);
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if (unlikely(p == NULL))
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printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n");
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return p;
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}
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static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
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{
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__be32 *p;
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p = read_buf(xdr, 4);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE);
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*len = ntohl(*p);
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if (*len != 0) {
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p = read_buf(xdr, *len);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE);
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*str = (const char *)p;
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} else
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*str = NULL;
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return 0;
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}
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static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
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{
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__be32 *p;
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p = read_buf(xdr, 4);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE);
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fh->size = ntohl(*p);
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if (fh->size > NFS4_FHSIZE)
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return htonl(NFS4ERR_BADHANDLE);
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p = read_buf(xdr, fh->size);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE);
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memcpy(&fh->data[0], p, fh->size);
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memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
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return 0;
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}
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static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
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{
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__be32 *p;
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unsigned int attrlen;
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p = read_buf(xdr, 4);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE);
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attrlen = ntohl(*p);
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p = read_buf(xdr, attrlen << 2);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE);
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if (likely(attrlen > 0))
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bitmap[0] = ntohl(*p++);
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if (attrlen > 1)
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bitmap[1] = ntohl(*p);
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return 0;
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}
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static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
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{
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__be32 *p;
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p = read_buf(xdr, 16);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE);
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memcpy(stateid->data, p, 16);
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return 0;
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}
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static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
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{
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__be32 *p;
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unsigned int minor_version;
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__be32 status;
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status = decode_string(xdr, &hdr->taglen, &hdr->tag);
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if (unlikely(status != 0))
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return status;
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/* We do not like overly long tags! */
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if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) {
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printk("NFSv4 CALLBACK %s: client sent tag of length %u\n",
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__func__, hdr->taglen);
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return htonl(NFS4ERR_RESOURCE);
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}
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p = read_buf(xdr, 12);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE);
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minor_version = ntohl(*p++);
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/* Check minor version is zero. */
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if (minor_version != 0) {
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printk(KERN_WARNING "%s: NFSv4 server callback with illegal minor version %u!\n",
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__func__, minor_version);
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return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
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}
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hdr->callback_ident = ntohl(*p++);
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hdr->nops = ntohl(*p);
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return 0;
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}
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static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
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{
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__be32 *p;
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p = read_buf(xdr, 4);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE);
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*op = ntohl(*p);
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return 0;
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}
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static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
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{
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__be32 status;
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status = decode_fh(xdr, &args->fh);
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if (unlikely(status != 0))
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goto out;
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args->addr = svc_addr(rqstp);
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status = decode_bitmap(xdr, args->bitmap);
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out:
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dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
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return status;
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}
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static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
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{
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__be32 *p;
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__be32 status;
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args->addr = svc_addr(rqstp);
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status = decode_stateid(xdr, &args->stateid);
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if (unlikely(status != 0))
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goto out;
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p = read_buf(xdr, 4);
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if (unlikely(p == NULL)) {
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status = htonl(NFS4ERR_RESOURCE);
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goto out;
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}
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args->truncate = ntohl(*p);
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status = decode_fh(xdr, &args->fh);
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out:
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dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
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return status;
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}
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static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
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{
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__be32 *p;
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p = xdr_reserve_space(xdr, 4 + len);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE);
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xdr_encode_opaque(p, str, len);
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return 0;
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}
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#define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
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#define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
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static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
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{
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__be32 bm[2];
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__be32 *p;
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bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
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bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
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if (bm[1] != 0) {
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p = xdr_reserve_space(xdr, 16);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE);
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*p++ = htonl(2);
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*p++ = bm[0];
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*p++ = bm[1];
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} else if (bm[0] != 0) {
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p = xdr_reserve_space(xdr, 12);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE);
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*p++ = htonl(1);
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*p++ = bm[0];
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} else {
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p = xdr_reserve_space(xdr, 8);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE);
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*p++ = htonl(0);
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}
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*savep = p;
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return 0;
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}
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static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
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{
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__be32 *p;
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if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
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return 0;
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p = xdr_reserve_space(xdr, 8);
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if (unlikely(!p))
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return htonl(NFS4ERR_RESOURCE);
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p = xdr_encode_hyper(p, change);
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return 0;
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}
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static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
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{
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__be32 *p;
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if (!(bitmap[0] & FATTR4_WORD0_SIZE))
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return 0;
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p = xdr_reserve_space(xdr, 8);
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if (unlikely(!p))
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return htonl(NFS4ERR_RESOURCE);
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p = xdr_encode_hyper(p, size);
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return 0;
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}
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static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
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{
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__be32 *p;
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p = xdr_reserve_space(xdr, 12);
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if (unlikely(!p))
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return htonl(NFS4ERR_RESOURCE);
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p = xdr_encode_hyper(p, time->tv_sec);
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*p = htonl(time->tv_nsec);
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return 0;
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}
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static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
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{
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if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
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return 0;
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return encode_attr_time(xdr,time);
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}
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static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
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{
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if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
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return 0;
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return encode_attr_time(xdr,time);
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}
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static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
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{
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__be32 status;
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hdr->status = xdr_reserve_space(xdr, 4);
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if (unlikely(hdr->status == NULL))
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return htonl(NFS4ERR_RESOURCE);
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status = encode_string(xdr, hdr->taglen, hdr->tag);
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if (unlikely(status != 0))
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return status;
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hdr->nops = xdr_reserve_space(xdr, 4);
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if (unlikely(hdr->nops == NULL))
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return htonl(NFS4ERR_RESOURCE);
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return 0;
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}
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static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
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{
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__be32 *p;
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p = xdr_reserve_space(xdr, 8);
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if (unlikely(p == NULL))
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return htonl(NFS4ERR_RESOURCE);
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*p++ = htonl(op);
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*p = res;
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return 0;
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}
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static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
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{
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__be32 *savep = NULL;
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__be32 status = res->status;
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if (unlikely(status != 0))
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goto out;
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status = encode_attr_bitmap(xdr, res->bitmap, &savep);
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if (unlikely(status != 0))
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goto out;
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status = encode_attr_change(xdr, res->bitmap, res->change_attr);
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if (unlikely(status != 0))
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goto out;
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status = encode_attr_size(xdr, res->bitmap, res->size);
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if (unlikely(status != 0))
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goto out;
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status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
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if (unlikely(status != 0))
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goto out;
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status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
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*savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
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out:
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dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
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return status;
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}
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static __be32 process_op(struct svc_rqst *rqstp,
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struct xdr_stream *xdr_in, void *argp,
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struct xdr_stream *xdr_out, void *resp)
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{
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struct callback_op *op = &callback_ops[0];
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unsigned int op_nr = OP_CB_ILLEGAL;
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__be32 status = 0;
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long maxlen;
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__be32 res;
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dprintk("%s: start\n", __func__);
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status = decode_op_hdr(xdr_in, &op_nr);
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if (likely(status == 0)) {
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switch (op_nr) {
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case OP_CB_GETATTR:
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case OP_CB_RECALL:
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op = &callback_ops[op_nr];
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break;
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default:
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op_nr = OP_CB_ILLEGAL;
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op = &callback_ops[0];
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status = htonl(NFS4ERR_OP_ILLEGAL);
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}
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}
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maxlen = xdr_out->end - xdr_out->p;
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if (maxlen > 0 && maxlen < PAGE_SIZE) {
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if (likely(status == 0 && op->decode_args != NULL))
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status = op->decode_args(rqstp, xdr_in, argp);
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if (likely(status == 0 && op->process_op != NULL))
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status = op->process_op(argp, resp);
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} else
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status = htonl(NFS4ERR_RESOURCE);
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res = encode_op_hdr(xdr_out, op_nr, status);
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if (status == 0)
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status = res;
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if (op->encode_res != NULL && status == 0)
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status = op->encode_res(rqstp, xdr_out, resp);
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dprintk("%s: done, status = %d\n", __func__, ntohl(status));
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return status;
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}
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/*
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* Decode, process and encode a COMPOUND
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*/
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static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
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{
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struct cb_compound_hdr_arg hdr_arg = { 0 };
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struct cb_compound_hdr_res hdr_res = { NULL };
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struct xdr_stream xdr_in, xdr_out;
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__be32 *p;
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__be32 status;
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unsigned int nops = 0;
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dprintk("%s: start\n", __func__);
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xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
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p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
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xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
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status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
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if (status == __constant_htonl(NFS4ERR_RESOURCE))
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return rpc_garbage_args;
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hdr_res.taglen = hdr_arg.taglen;
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hdr_res.tag = hdr_arg.tag;
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if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
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return rpc_system_err;
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while (status == 0 && nops != hdr_arg.nops) {
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status = process_op(rqstp, &xdr_in, argp, &xdr_out, resp);
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nops++;
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}
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*hdr_res.status = status;
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*hdr_res.nops = htonl(nops);
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dprintk("%s: done, status = %u\n", __func__, ntohl(status));
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return rpc_success;
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}
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/*
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* Define NFS4 callback COMPOUND ops.
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*/
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static struct callback_op callback_ops[] = {
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[0] = {
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.res_maxsize = CB_OP_HDR_RES_MAXSZ,
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},
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[OP_CB_GETATTR] = {
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.process_op = (callback_process_op_t)nfs4_callback_getattr,
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.decode_args = (callback_decode_arg_t)decode_getattr_args,
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.encode_res = (callback_encode_res_t)encode_getattr_res,
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.res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
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},
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[OP_CB_RECALL] = {
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.process_op = (callback_process_op_t)nfs4_callback_recall,
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.decode_args = (callback_decode_arg_t)decode_recall_args,
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.res_maxsize = CB_OP_RECALL_RES_MAXSZ,
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}
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};
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/*
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* Define NFS4 callback procedures
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*/
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static struct svc_procedure nfs4_callback_procedures1[] = {
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[CB_NULL] = {
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.pc_func = nfs4_callback_null,
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.pc_decode = (kxdrproc_t)nfs4_decode_void,
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.pc_encode = (kxdrproc_t)nfs4_encode_void,
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.pc_xdrressize = 1,
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},
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[CB_COMPOUND] = {
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.pc_func = nfs4_callback_compound,
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.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,
|
|
};
|
|
|