793 lines
18 KiB
C
793 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* 9P Protocol Support Code
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*
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* Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
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*
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* Base on code from Anthony Liguori <aliguori@us.ibm.com>
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* Copyright (C) 2008 by IBM, Corp.
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/uaccess.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/stddef.h>
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#include <linux/types.h>
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#include <linux/uio.h>
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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#include "protocol.h"
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#include <trace/events/9p.h>
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/* len[2] text[len] */
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#define P9_STRLEN(s) \
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(2 + min_t(size_t, s ? strlen(s) : 0, USHRT_MAX))
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/**
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* p9_msg_buf_size - Returns a buffer size sufficiently large to hold the
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* intended 9p message.
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* @c: client
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* @type: message type
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* @fmt: format template for assembling request message
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* (see p9pdu_vwritef)
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* @ap: variable arguments to be fed to passed format template
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* (see p9pdu_vwritef)
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*
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* Note: Even for response types (P9_R*) the format template and variable
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* arguments must always be for the originating request type (P9_T*).
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*/
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size_t p9_msg_buf_size(struct p9_client *c, enum p9_msg_t type,
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const char *fmt, va_list ap)
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{
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/* size[4] type[1] tag[2] */
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const int hdr = 4 + 1 + 2;
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/* ename[s] errno[4] */
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const int rerror_size = hdr + P9_ERRMAX + 4;
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/* ecode[4] */
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const int rlerror_size = hdr + 4;
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const int err_size =
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c->proto_version == p9_proto_2000L ? rlerror_size : rerror_size;
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static_assert(NAME_MAX <= 4*1024, "p9_msg_buf_size() currently assumes "
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"a max. allowed directory entry name length of 4k");
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switch (type) {
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/* message types not used at all */
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case P9_TERROR:
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case P9_TLERROR:
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case P9_TAUTH:
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case P9_RAUTH:
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BUG();
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/* variable length & potentially large message types */
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case P9_TATTACH:
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BUG_ON(strcmp("ddss?u", fmt));
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va_arg(ap, int32_t);
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va_arg(ap, int32_t);
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{
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const char *uname = va_arg(ap, const char *);
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const char *aname = va_arg(ap, const char *);
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/* fid[4] afid[4] uname[s] aname[s] n_uname[4] */
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return hdr + 4 + 4 + P9_STRLEN(uname) + P9_STRLEN(aname) + 4;
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}
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case P9_TWALK:
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BUG_ON(strcmp("ddT", fmt));
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va_arg(ap, int32_t);
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va_arg(ap, int32_t);
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{
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uint i, nwname = va_arg(ap, int);
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size_t wname_all;
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const char **wnames = va_arg(ap, const char **);
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for (i = 0, wname_all = 0; i < nwname; ++i) {
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wname_all += P9_STRLEN(wnames[i]);
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}
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/* fid[4] newfid[4] nwname[2] nwname*(wname[s]) */
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return hdr + 4 + 4 + 2 + wname_all;
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}
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case P9_RWALK:
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BUG_ON(strcmp("ddT", fmt));
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va_arg(ap, int32_t);
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va_arg(ap, int32_t);
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{
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uint nwname = va_arg(ap, int);
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/* nwqid[2] nwqid*(wqid[13]) */
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return max_t(size_t, hdr + 2 + nwname * 13, err_size);
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}
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case P9_TCREATE:
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BUG_ON(strcmp("dsdb?s", fmt));
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va_arg(ap, int32_t);
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{
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const char *name = va_arg(ap, const char *);
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if (c->proto_version == p9_proto_legacy) {
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/* fid[4] name[s] perm[4] mode[1] */
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return hdr + 4 + P9_STRLEN(name) + 4 + 1;
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} else {
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va_arg(ap, int32_t);
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va_arg(ap, int);
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{
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const char *ext = va_arg(ap, const char *);
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/* fid[4] name[s] perm[4] mode[1] extension[s] */
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return hdr + 4 + P9_STRLEN(name) + 4 + 1 + P9_STRLEN(ext);
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}
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}
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}
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case P9_TLCREATE:
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BUG_ON(strcmp("dsddg", fmt));
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va_arg(ap, int32_t);
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{
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const char *name = va_arg(ap, const char *);
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/* fid[4] name[s] flags[4] mode[4] gid[4] */
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return hdr + 4 + P9_STRLEN(name) + 4 + 4 + 4;
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}
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case P9_RREAD:
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case P9_RREADDIR:
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BUG_ON(strcmp("dqd", fmt));
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va_arg(ap, int32_t);
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va_arg(ap, int64_t);
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{
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const int32_t count = va_arg(ap, int32_t);
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/* count[4] data[count] */
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return max_t(size_t, hdr + 4 + count, err_size);
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}
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case P9_TWRITE:
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BUG_ON(strcmp("dqV", fmt));
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va_arg(ap, int32_t);
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va_arg(ap, int64_t);
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{
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const int32_t count = va_arg(ap, int32_t);
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/* fid[4] offset[8] count[4] data[count] */
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return hdr + 4 + 8 + 4 + count;
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}
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case P9_TRENAMEAT:
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BUG_ON(strcmp("dsds", fmt));
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va_arg(ap, int32_t);
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{
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const char *oldname, *newname;
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oldname = va_arg(ap, const char *);
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va_arg(ap, int32_t);
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newname = va_arg(ap, const char *);
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/* olddirfid[4] oldname[s] newdirfid[4] newname[s] */
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return hdr + 4 + P9_STRLEN(oldname) + 4 + P9_STRLEN(newname);
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}
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case P9_TSYMLINK:
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BUG_ON(strcmp("dssg", fmt));
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va_arg(ap, int32_t);
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{
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const char *name = va_arg(ap, const char *);
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const char *symtgt = va_arg(ap, const char *);
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/* fid[4] name[s] symtgt[s] gid[4] */
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return hdr + 4 + P9_STRLEN(name) + P9_STRLEN(symtgt) + 4;
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}
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case P9_RERROR:
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return rerror_size;
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case P9_RLERROR:
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return rlerror_size;
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/* small message types */
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case P9_TWSTAT:
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case P9_RSTAT:
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case P9_RREADLINK:
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case P9_TXATTRWALK:
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case P9_TXATTRCREATE:
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case P9_TLINK:
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case P9_TMKDIR:
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case P9_TMKNOD:
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case P9_TRENAME:
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case P9_TUNLINKAT:
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case P9_TLOCK:
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return 8 * 1024;
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/* tiny message types */
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default:
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return 4 * 1024;
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}
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}
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static int
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p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...);
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void p9stat_free(struct p9_wstat *stbuf)
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{
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kfree(stbuf->name);
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stbuf->name = NULL;
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kfree(stbuf->uid);
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stbuf->uid = NULL;
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kfree(stbuf->gid);
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stbuf->gid = NULL;
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kfree(stbuf->muid);
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stbuf->muid = NULL;
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kfree(stbuf->extension);
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stbuf->extension = NULL;
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}
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EXPORT_SYMBOL(p9stat_free);
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size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size)
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{
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size_t len = min(pdu->size - pdu->offset, size);
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memcpy(data, &pdu->sdata[pdu->offset], len);
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pdu->offset += len;
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return size - len;
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}
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static size_t pdu_write(struct p9_fcall *pdu, const void *data, size_t size)
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{
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size_t len = min(pdu->capacity - pdu->size, size);
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memcpy(&pdu->sdata[pdu->size], data, len);
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pdu->size += len;
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return size - len;
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}
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static size_t
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pdu_write_u(struct p9_fcall *pdu, struct iov_iter *from, size_t size)
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{
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size_t len = min(pdu->capacity - pdu->size, size);
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if (!copy_from_iter_full(&pdu->sdata[pdu->size], len, from))
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len = 0;
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pdu->size += len;
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return size - len;
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}
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/* b - int8_t
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* w - int16_t
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* d - int32_t
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* q - int64_t
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* s - string
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* u - numeric uid
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* g - numeric gid
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* S - stat
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* Q - qid
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* D - data blob (int32_t size followed by void *, results are not freed)
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* T - array of strings (int16_t count, followed by strings)
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* R - array of qids (int16_t count, followed by qids)
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* A - stat for 9p2000.L (p9_stat_dotl)
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* ? - if optional = 1, continue parsing
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*/
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static int
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p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt,
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va_list ap)
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{
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const char *ptr;
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int errcode = 0;
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for (ptr = fmt; *ptr; ptr++) {
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switch (*ptr) {
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case 'b':{
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int8_t *val = va_arg(ap, int8_t *);
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if (pdu_read(pdu, val, sizeof(*val))) {
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errcode = -EFAULT;
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break;
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}
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}
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break;
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case 'w':{
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int16_t *val = va_arg(ap, int16_t *);
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__le16 le_val;
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if (pdu_read(pdu, &le_val, sizeof(le_val))) {
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errcode = -EFAULT;
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break;
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}
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*val = le16_to_cpu(le_val);
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}
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break;
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case 'd':{
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int32_t *val = va_arg(ap, int32_t *);
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__le32 le_val;
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if (pdu_read(pdu, &le_val, sizeof(le_val))) {
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errcode = -EFAULT;
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break;
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}
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*val = le32_to_cpu(le_val);
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}
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break;
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case 'q':{
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int64_t *val = va_arg(ap, int64_t *);
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__le64 le_val;
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if (pdu_read(pdu, &le_val, sizeof(le_val))) {
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errcode = -EFAULT;
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break;
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}
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*val = le64_to_cpu(le_val);
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}
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break;
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case 's':{
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char **sptr = va_arg(ap, char **);
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uint16_t len;
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errcode = p9pdu_readf(pdu, proto_version,
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"w", &len);
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if (errcode)
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break;
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*sptr = kmalloc(len + 1, GFP_NOFS);
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if (*sptr == NULL) {
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errcode = -ENOMEM;
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break;
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}
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if (pdu_read(pdu, *sptr, len)) {
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errcode = -EFAULT;
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kfree(*sptr);
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*sptr = NULL;
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} else
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(*sptr)[len] = 0;
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}
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break;
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case 'u': {
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kuid_t *uid = va_arg(ap, kuid_t *);
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__le32 le_val;
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if (pdu_read(pdu, &le_val, sizeof(le_val))) {
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errcode = -EFAULT;
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break;
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}
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*uid = make_kuid(&init_user_ns,
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le32_to_cpu(le_val));
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} break;
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case 'g': {
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kgid_t *gid = va_arg(ap, kgid_t *);
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__le32 le_val;
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if (pdu_read(pdu, &le_val, sizeof(le_val))) {
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errcode = -EFAULT;
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break;
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}
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*gid = make_kgid(&init_user_ns,
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le32_to_cpu(le_val));
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} break;
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case 'Q':{
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struct p9_qid *qid =
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va_arg(ap, struct p9_qid *);
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errcode = p9pdu_readf(pdu, proto_version, "bdq",
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&qid->type, &qid->version,
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&qid->path);
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}
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break;
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case 'S':{
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struct p9_wstat *stbuf =
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va_arg(ap, struct p9_wstat *);
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memset(stbuf, 0, sizeof(struct p9_wstat));
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stbuf->n_uid = stbuf->n_muid = INVALID_UID;
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stbuf->n_gid = INVALID_GID;
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errcode =
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p9pdu_readf(pdu, proto_version,
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"wwdQdddqssss?sugu",
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&stbuf->size, &stbuf->type,
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&stbuf->dev, &stbuf->qid,
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&stbuf->mode, &stbuf->atime,
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&stbuf->mtime, &stbuf->length,
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&stbuf->name, &stbuf->uid,
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&stbuf->gid, &stbuf->muid,
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&stbuf->extension,
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&stbuf->n_uid, &stbuf->n_gid,
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&stbuf->n_muid);
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if (errcode)
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p9stat_free(stbuf);
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}
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break;
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case 'D':{
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uint32_t *count = va_arg(ap, uint32_t *);
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void **data = va_arg(ap, void **);
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errcode =
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p9pdu_readf(pdu, proto_version, "d", count);
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if (!errcode) {
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*count =
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min_t(uint32_t, *count,
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pdu->size - pdu->offset);
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*data = &pdu->sdata[pdu->offset];
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}
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}
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break;
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case 'T':{
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uint16_t *nwname = va_arg(ap, uint16_t *);
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char ***wnames = va_arg(ap, char ***);
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errcode = p9pdu_readf(pdu, proto_version,
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"w", nwname);
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if (!errcode) {
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*wnames =
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kmalloc_array(*nwname,
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sizeof(char *),
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GFP_NOFS);
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if (!*wnames)
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errcode = -ENOMEM;
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}
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if (!errcode) {
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int i;
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for (i = 0; i < *nwname; i++) {
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errcode =
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p9pdu_readf(pdu,
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proto_version,
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"s",
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&(*wnames)[i]);
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if (errcode)
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break;
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}
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}
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if (errcode) {
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if (*wnames) {
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int i;
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for (i = 0; i < *nwname; i++)
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kfree((*wnames)[i]);
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}
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kfree(*wnames);
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*wnames = NULL;
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}
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}
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break;
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case 'R':{
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uint16_t *nwqid = va_arg(ap, uint16_t *);
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struct p9_qid **wqids =
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va_arg(ap, struct p9_qid **);
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*wqids = NULL;
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errcode =
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p9pdu_readf(pdu, proto_version, "w", nwqid);
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if (!errcode) {
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*wqids =
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kmalloc_array(*nwqid,
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sizeof(struct p9_qid),
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GFP_NOFS);
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if (*wqids == NULL)
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errcode = -ENOMEM;
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}
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if (!errcode) {
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int i;
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for (i = 0; i < *nwqid; i++) {
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errcode =
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p9pdu_readf(pdu,
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proto_version,
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"Q",
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&(*wqids)[i]);
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if (errcode)
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break;
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}
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}
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if (errcode) {
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kfree(*wqids);
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*wqids = NULL;
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}
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}
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break;
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case 'A': {
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struct p9_stat_dotl *stbuf =
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va_arg(ap, struct p9_stat_dotl *);
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memset(stbuf, 0, sizeof(struct p9_stat_dotl));
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errcode =
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p9pdu_readf(pdu, proto_version,
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"qQdugqqqqqqqqqqqqqqq",
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&stbuf->st_result_mask,
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&stbuf->qid,
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&stbuf->st_mode,
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&stbuf->st_uid, &stbuf->st_gid,
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&stbuf->st_nlink,
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&stbuf->st_rdev, &stbuf->st_size,
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&stbuf->st_blksize, &stbuf->st_blocks,
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&stbuf->st_atime_sec,
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&stbuf->st_atime_nsec,
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&stbuf->st_mtime_sec,
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&stbuf->st_mtime_nsec,
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&stbuf->st_ctime_sec,
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&stbuf->st_ctime_nsec,
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&stbuf->st_btime_sec,
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&stbuf->st_btime_nsec,
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&stbuf->st_gen,
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&stbuf->st_data_version);
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}
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break;
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case '?':
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if ((proto_version != p9_proto_2000u) &&
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(proto_version != p9_proto_2000L))
|
|
return 0;
|
|
break;
|
|
default:
|
|
BUG();
|
|
break;
|
|
}
|
|
|
|
if (errcode)
|
|
break;
|
|
}
|
|
|
|
return errcode;
|
|
}
|
|
|
|
int
|
|
p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
|
|
va_list ap)
|
|
{
|
|
const char *ptr;
|
|
int errcode = 0;
|
|
|
|
for (ptr = fmt; *ptr; ptr++) {
|
|
switch (*ptr) {
|
|
case 'b':{
|
|
int8_t val = va_arg(ap, int);
|
|
if (pdu_write(pdu, &val, sizeof(val)))
|
|
errcode = -EFAULT;
|
|
}
|
|
break;
|
|
case 'w':{
|
|
__le16 val = cpu_to_le16(va_arg(ap, int));
|
|
if (pdu_write(pdu, &val, sizeof(val)))
|
|
errcode = -EFAULT;
|
|
}
|
|
break;
|
|
case 'd':{
|
|
__le32 val = cpu_to_le32(va_arg(ap, int32_t));
|
|
if (pdu_write(pdu, &val, sizeof(val)))
|
|
errcode = -EFAULT;
|
|
}
|
|
break;
|
|
case 'q':{
|
|
__le64 val = cpu_to_le64(va_arg(ap, int64_t));
|
|
if (pdu_write(pdu, &val, sizeof(val)))
|
|
errcode = -EFAULT;
|
|
}
|
|
break;
|
|
case 's':{
|
|
const char *sptr = va_arg(ap, const char *);
|
|
uint16_t len = 0;
|
|
if (sptr)
|
|
len = min_t(size_t, strlen(sptr),
|
|
USHRT_MAX);
|
|
|
|
errcode = p9pdu_writef(pdu, proto_version,
|
|
"w", len);
|
|
if (!errcode && pdu_write(pdu, sptr, len))
|
|
errcode = -EFAULT;
|
|
}
|
|
break;
|
|
case 'u': {
|
|
kuid_t uid = va_arg(ap, kuid_t);
|
|
__le32 val = cpu_to_le32(
|
|
from_kuid(&init_user_ns, uid));
|
|
if (pdu_write(pdu, &val, sizeof(val)))
|
|
errcode = -EFAULT;
|
|
} break;
|
|
case 'g': {
|
|
kgid_t gid = va_arg(ap, kgid_t);
|
|
__le32 val = cpu_to_le32(
|
|
from_kgid(&init_user_ns, gid));
|
|
if (pdu_write(pdu, &val, sizeof(val)))
|
|
errcode = -EFAULT;
|
|
} break;
|
|
case 'Q':{
|
|
const struct p9_qid *qid =
|
|
va_arg(ap, const struct p9_qid *);
|
|
errcode =
|
|
p9pdu_writef(pdu, proto_version, "bdq",
|
|
qid->type, qid->version,
|
|
qid->path);
|
|
} break;
|
|
case 'S':{
|
|
const struct p9_wstat *stbuf =
|
|
va_arg(ap, const struct p9_wstat *);
|
|
errcode =
|
|
p9pdu_writef(pdu, proto_version,
|
|
"wwdQdddqssss?sugu",
|
|
stbuf->size, stbuf->type,
|
|
stbuf->dev, &stbuf->qid,
|
|
stbuf->mode, stbuf->atime,
|
|
stbuf->mtime, stbuf->length,
|
|
stbuf->name, stbuf->uid,
|
|
stbuf->gid, stbuf->muid,
|
|
stbuf->extension, stbuf->n_uid,
|
|
stbuf->n_gid, stbuf->n_muid);
|
|
} break;
|
|
case 'V':{
|
|
uint32_t count = va_arg(ap, uint32_t);
|
|
struct iov_iter *from =
|
|
va_arg(ap, struct iov_iter *);
|
|
errcode = p9pdu_writef(pdu, proto_version, "d",
|
|
count);
|
|
if (!errcode && pdu_write_u(pdu, from, count))
|
|
errcode = -EFAULT;
|
|
}
|
|
break;
|
|
case 'T':{
|
|
uint16_t nwname = va_arg(ap, int);
|
|
const char **wnames = va_arg(ap, const char **);
|
|
|
|
errcode = p9pdu_writef(pdu, proto_version, "w",
|
|
nwname);
|
|
if (!errcode) {
|
|
int i;
|
|
|
|
for (i = 0; i < nwname; i++) {
|
|
errcode =
|
|
p9pdu_writef(pdu,
|
|
proto_version,
|
|
"s",
|
|
wnames[i]);
|
|
if (errcode)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case 'R':{
|
|
uint16_t nwqid = va_arg(ap, int);
|
|
struct p9_qid *wqids =
|
|
va_arg(ap, struct p9_qid *);
|
|
|
|
errcode = p9pdu_writef(pdu, proto_version, "w",
|
|
nwqid);
|
|
if (!errcode) {
|
|
int i;
|
|
|
|
for (i = 0; i < nwqid; i++) {
|
|
errcode =
|
|
p9pdu_writef(pdu,
|
|
proto_version,
|
|
"Q",
|
|
&wqids[i]);
|
|
if (errcode)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case 'I':{
|
|
struct p9_iattr_dotl *p9attr = va_arg(ap,
|
|
struct p9_iattr_dotl *);
|
|
|
|
errcode = p9pdu_writef(pdu, proto_version,
|
|
"ddugqqqqq",
|
|
p9attr->valid,
|
|
p9attr->mode,
|
|
p9attr->uid,
|
|
p9attr->gid,
|
|
p9attr->size,
|
|
p9attr->atime_sec,
|
|
p9attr->atime_nsec,
|
|
p9attr->mtime_sec,
|
|
p9attr->mtime_nsec);
|
|
}
|
|
break;
|
|
case '?':
|
|
if ((proto_version != p9_proto_2000u) &&
|
|
(proto_version != p9_proto_2000L))
|
|
return 0;
|
|
break;
|
|
default:
|
|
BUG();
|
|
break;
|
|
}
|
|
|
|
if (errcode)
|
|
break;
|
|
}
|
|
|
|
return errcode;
|
|
}
|
|
|
|
int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int ret;
|
|
|
|
va_start(ap, fmt);
|
|
ret = p9pdu_vreadf(pdu, proto_version, fmt, ap);
|
|
va_end(ap);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int ret;
|
|
|
|
va_start(ap, fmt);
|
|
ret = p9pdu_vwritef(pdu, proto_version, fmt, ap);
|
|
va_end(ap);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int p9stat_read(struct p9_client *clnt, char *buf, int len, struct p9_wstat *st)
|
|
{
|
|
struct p9_fcall fake_pdu;
|
|
int ret;
|
|
|
|
fake_pdu.size = len;
|
|
fake_pdu.capacity = len;
|
|
fake_pdu.sdata = buf;
|
|
fake_pdu.offset = 0;
|
|
|
|
ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "S", st);
|
|
if (ret) {
|
|
p9_debug(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret);
|
|
trace_9p_protocol_dump(clnt, &fake_pdu);
|
|
return ret;
|
|
}
|
|
|
|
return fake_pdu.offset;
|
|
}
|
|
EXPORT_SYMBOL(p9stat_read);
|
|
|
|
int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type)
|
|
{
|
|
pdu->id = type;
|
|
return p9pdu_writef(pdu, 0, "dbw", 0, type, tag);
|
|
}
|
|
|
|
int p9pdu_finalize(struct p9_client *clnt, struct p9_fcall *pdu)
|
|
{
|
|
int size = pdu->size;
|
|
int err;
|
|
|
|
pdu->size = 0;
|
|
err = p9pdu_writef(pdu, 0, "d", size);
|
|
pdu->size = size;
|
|
|
|
trace_9p_protocol_dump(clnt, pdu);
|
|
p9_debug(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n",
|
|
pdu->size, pdu->id, pdu->tag);
|
|
|
|
return err;
|
|
}
|
|
|
|
void p9pdu_reset(struct p9_fcall *pdu)
|
|
{
|
|
pdu->offset = 0;
|
|
pdu->size = 0;
|
|
}
|
|
|
|
int p9dirent_read(struct p9_client *clnt, char *buf, int len,
|
|
struct p9_dirent *dirent)
|
|
{
|
|
struct p9_fcall fake_pdu;
|
|
int ret;
|
|
char *nameptr;
|
|
|
|
fake_pdu.size = len;
|
|
fake_pdu.capacity = len;
|
|
fake_pdu.sdata = buf;
|
|
fake_pdu.offset = 0;
|
|
|
|
ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "Qqbs", &dirent->qid,
|
|
&dirent->d_off, &dirent->d_type, &nameptr);
|
|
if (ret) {
|
|
p9_debug(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n", ret);
|
|
trace_9p_protocol_dump(clnt, &fake_pdu);
|
|
return ret;
|
|
}
|
|
|
|
ret = strscpy(dirent->d_name, nameptr, sizeof(dirent->d_name));
|
|
if (ret < 0) {
|
|
p9_debug(P9_DEBUG_ERROR,
|
|
"On the wire dirent name too long: %s\n",
|
|
nameptr);
|
|
kfree(nameptr);
|
|
return ret;
|
|
}
|
|
kfree(nameptr);
|
|
|
|
return fake_pdu.offset;
|
|
}
|
|
EXPORT_SYMBOL(p9dirent_read);
|