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-rw-r--r--fs/9p/conv.c693
1 files changed, 693 insertions, 0 deletions
diff --git a/fs/9p/conv.c b/fs/9p/conv.c
new file mode 100644
index 000000000000..1554731bd653
--- /dev/null
+++ b/fs/9p/conv.c
@@ -0,0 +1,693 @@
+/*
+ * linux/fs/9p/conv.c
+ *
+ * 9P protocol conversion functions
+ *
+ * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
+ * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to:
+ * Free Software Foundation
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA 02111-1301 USA
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/idr.h>
+
+#include "debug.h"
+#include "v9fs.h"
+#include "9p.h"
+#include "conv.h"
+
+/*
+ * Buffer to help with string parsing
+ */
+struct cbuf {
+ unsigned char *sp;
+ unsigned char *p;
+ unsigned char *ep;
+};
+
+static inline void buf_init(struct cbuf *buf, void *data, int datalen)
+{
+ buf->sp = buf->p = data;
+ buf->ep = data + datalen;
+}
+
+static inline int buf_check_overflow(struct cbuf *buf)
+{
+ return buf->p > buf->ep;
+}
+
+static inline void buf_check_size(struct cbuf *buf, int len)
+{
+ if (buf->p+len > buf->ep) {
+ if (buf->p < buf->ep) {
+ eprintk(KERN_ERR, "buffer overflow\n");
+ buf->p = buf->ep + 1;
+ }
+ }
+}
+
+static inline void *buf_alloc(struct cbuf *buf, int len)
+{
+ void *ret = NULL;
+
+ buf_check_size(buf, len);
+ ret = buf->p;
+ buf->p += len;
+
+ return ret;
+}
+
+static inline void buf_put_int8(struct cbuf *buf, u8 val)
+{
+ buf_check_size(buf, 1);
+
+ buf->p[0] = val;
+ buf->p++;
+}
+
+static inline void buf_put_int16(struct cbuf *buf, u16 val)
+{
+ buf_check_size(buf, 2);
+
+ *(__le16 *) buf->p = cpu_to_le16(val);
+ buf->p += 2;
+}
+
+static inline void buf_put_int32(struct cbuf *buf, u32 val)
+{
+ buf_check_size(buf, 4);
+
+ *(__le32 *)buf->p = cpu_to_le32(val);
+ buf->p += 4;
+}
+
+static inline void buf_put_int64(struct cbuf *buf, u64 val)
+{
+ buf_check_size(buf, 8);
+
+ *(__le64 *)buf->p = cpu_to_le64(val);
+ buf->p += 8;
+}
+
+static inline void buf_put_stringn(struct cbuf *buf, const char *s, u16 slen)
+{
+ buf_check_size(buf, slen + 2);
+
+ buf_put_int16(buf, slen);
+ memcpy(buf->p, s, slen);
+ buf->p += slen;
+}
+
+static inline void buf_put_string(struct cbuf *buf, const char *s)
+{
+ buf_put_stringn(buf, s, strlen(s));
+}
+
+static inline void buf_put_data(struct cbuf *buf, void *data, u32 datalen)
+{
+ buf_check_size(buf, datalen);
+
+ memcpy(buf->p, data, datalen);
+ buf->p += datalen;
+}
+
+static inline u8 buf_get_int8(struct cbuf *buf)
+{
+ u8 ret = 0;
+
+ buf_check_size(buf, 1);
+ ret = buf->p[0];
+
+ buf->p++;
+
+ return ret;
+}
+
+static inline u16 buf_get_int16(struct cbuf *buf)
+{
+ u16 ret = 0;
+
+ buf_check_size(buf, 2);
+ ret = le16_to_cpu(*(__le16 *)buf->p);
+
+ buf->p += 2;
+
+ return ret;
+}
+
+static inline u32 buf_get_int32(struct cbuf *buf)
+{
+ u32 ret = 0;
+
+ buf_check_size(buf, 4);
+ ret = le32_to_cpu(*(__le32 *)buf->p);
+
+ buf->p += 4;
+
+ return ret;
+}
+
+static inline u64 buf_get_int64(struct cbuf *buf)
+{
+ u64 ret = 0;
+
+ buf_check_size(buf, 8);
+ ret = le64_to_cpu(*(__le64 *)buf->p);
+
+ buf->p += 8;
+
+ return ret;
+}
+
+static inline int
+buf_get_string(struct cbuf *buf, char *data, unsigned int datalen)
+{
+
+ u16 len = buf_get_int16(buf);
+ buf_check_size(buf, len);
+ if (len + 1 > datalen)
+ return 0;
+
+ memcpy(data, buf->p, len);
+ data[len] = 0;
+ buf->p += len;
+
+ return len + 1;
+}
+
+static inline char *buf_get_stringb(struct cbuf *buf, struct cbuf *sbuf)
+{
+ char *ret = NULL;
+ int n = buf_get_string(buf, sbuf->p, sbuf->ep - sbuf->p);
+
+ if (n > 0) {
+ ret = sbuf->p;
+ sbuf->p += n;
+ }
+
+ return ret;
+}
+
+static inline int buf_get_data(struct cbuf *buf, void *data, int datalen)
+{
+ buf_check_size(buf, datalen);
+
+ memcpy(data, buf->p, datalen);
+ buf->p += datalen;
+
+ return datalen;
+}
+
+static inline void *buf_get_datab(struct cbuf *buf, struct cbuf *dbuf,
+ int datalen)
+{
+ char *ret = NULL;
+ int n = 0;
+
+ buf_check_size(dbuf, datalen);
+
+ n = buf_get_data(buf, dbuf->p, datalen);
+
+ if (n > 0) {
+ ret = dbuf->p;
+ dbuf->p += n;
+ }
+
+ return ret;
+}
+
+/**
+ * v9fs_size_stat - calculate the size of a variable length stat struct
+ * @v9ses: session information
+ * @stat: metadata (stat) structure
+ *
+ */
+
+static int v9fs_size_stat(struct v9fs_session_info *v9ses,
+ struct v9fs_stat *stat)
+{
+ int size = 0;
+
+ if (stat == NULL) {
+ eprintk(KERN_ERR, "v9fs_size_stat: got a NULL stat pointer\n");
+ return 0;
+ }
+
+ size = /* 2 + *//* size[2] */
+ 2 + /* type[2] */
+ 4 + /* dev[4] */
+ 1 + /* qid.type[1] */
+ 4 + /* qid.vers[4] */
+ 8 + /* qid.path[8] */
+ 4 + /* mode[4] */
+ 4 + /* atime[4] */
+ 4 + /* mtime[4] */
+ 8 + /* length[8] */
+ 8; /* minimum sum of string lengths */
+
+ if (stat->name)
+ size += strlen(stat->name);
+ if (stat->uid)
+ size += strlen(stat->uid);
+ if (stat->gid)
+ size += strlen(stat->gid);
+ if (stat->muid)
+ size += strlen(stat->muid);
+
+ if (v9ses->extended) {
+ size += 4 + /* n_uid[4] */
+ 4 + /* n_gid[4] */
+ 4 + /* n_muid[4] */
+ 2; /* string length of extension[4] */
+ if (stat->extension)
+ size += strlen(stat->extension);
+ }
+
+ return size;
+}
+
+/**
+ * serialize_stat - safely format a stat structure for transmission
+ * @v9ses: session info
+ * @stat: metadata (stat) structure
+ * @bufp: buffer to serialize structure into
+ *
+ */
+
+static int
+serialize_stat(struct v9fs_session_info *v9ses, struct v9fs_stat *stat,
+ struct cbuf *bufp)
+{
+ buf_put_int16(bufp, stat->size);
+ buf_put_int16(bufp, stat->type);
+ buf_put_int32(bufp, stat->dev);
+ buf_put_int8(bufp, stat->qid.type);
+ buf_put_int32(bufp, stat->qid.version);
+ buf_put_int64(bufp, stat->qid.path);
+ buf_put_int32(bufp, stat->mode);
+ buf_put_int32(bufp, stat->atime);
+ buf_put_int32(bufp, stat->mtime);
+ buf_put_int64(bufp, stat->length);
+
+ buf_put_string(bufp, stat->name);
+ buf_put_string(bufp, stat->uid);
+ buf_put_string(bufp, stat->gid);
+ buf_put_string(bufp, stat->muid);
+
+ if (v9ses->extended) {
+ buf_put_string(bufp, stat->extension);
+ buf_put_int32(bufp, stat->n_uid);
+ buf_put_int32(bufp, stat->n_gid);
+ buf_put_int32(bufp, stat->n_muid);
+ }
+
+ if (buf_check_overflow(bufp))
+ return 0;
+
+ return stat->size;
+}
+
+/**
+ * deserialize_stat - safely decode a recieved metadata (stat) structure
+ * @v9ses: session info
+ * @bufp: buffer to deserialize
+ * @stat: metadata (stat) structure
+ * @dbufp: buffer to deserialize variable strings into
+ *
+ */
+
+static inline int
+deserialize_stat(struct v9fs_session_info *v9ses, struct cbuf *bufp,
+ struct v9fs_stat *stat, struct cbuf *dbufp)
+{
+
+ stat->size = buf_get_int16(bufp);
+ stat->type = buf_get_int16(bufp);
+ stat->dev = buf_get_int32(bufp);
+ stat->qid.type = buf_get_int8(bufp);
+ stat->qid.version = buf_get_int32(bufp);
+ stat->qid.path = buf_get_int64(bufp);
+ stat->mode = buf_get_int32(bufp);
+ stat->atime = buf_get_int32(bufp);
+ stat->mtime = buf_get_int32(bufp);
+ stat->length = buf_get_int64(bufp);
+ stat->name = buf_get_stringb(bufp, dbufp);
+ stat->uid = buf_get_stringb(bufp, dbufp);
+ stat->gid = buf_get_stringb(bufp, dbufp);
+ stat->muid = buf_get_stringb(bufp, dbufp);
+
+ if (v9ses->extended) {
+ stat->extension = buf_get_stringb(bufp, dbufp);
+ stat->n_uid = buf_get_int32(bufp);
+ stat->n_gid = buf_get_int32(bufp);
+ stat->n_muid = buf_get_int32(bufp);
+ }
+
+ if (buf_check_overflow(bufp) || buf_check_overflow(dbufp))
+ return 0;
+
+ return stat->size + 2;
+}
+
+/**
+ * deserialize_statb - wrapper for decoding a received metadata structure
+ * @v9ses: session info
+ * @bufp: buffer to deserialize
+ * @dbufp: buffer to deserialize variable strings into
+ *
+ */
+
+static inline struct v9fs_stat *deserialize_statb(struct v9fs_session_info
+ *v9ses, struct cbuf *bufp,
+ struct cbuf *dbufp)
+{
+ struct v9fs_stat *ret = buf_alloc(dbufp, sizeof(struct v9fs_stat));
+
+ if (ret) {
+ int n = deserialize_stat(v9ses, bufp, ret, dbufp);
+ if (n <= 0)
+ return NULL;
+ }
+
+ return ret;
+}
+
+/**
+ * v9fs_deserialize_stat - decode a received metadata structure
+ * @v9ses: session info
+ * @buf: buffer to deserialize
+ * @buflen: length of received buffer
+ * @stat: metadata structure to decode into
+ * @statlen: length of destination metadata structure
+ *
+ */
+
+int
+v9fs_deserialize_stat(struct v9fs_session_info *v9ses, void *buf,
+ u32 buflen, struct v9fs_stat *stat, u32 statlen)
+{
+ struct cbuf buffer;
+ struct cbuf *bufp = &buffer;
+ struct cbuf dbuffer;
+ struct cbuf *dbufp = &dbuffer;
+
+ buf_init(bufp, buf, buflen);
+ buf_init(dbufp, (char *)stat + sizeof(struct v9fs_stat),
+ statlen - sizeof(struct v9fs_stat));
+
+ return deserialize_stat(v9ses, bufp, stat, dbufp);
+}
+
+static inline int
+v9fs_size_fcall(struct v9fs_session_info *v9ses, struct v9fs_fcall *fcall)
+{
+ int size = 4 + 1 + 2; /* size[4] msg[1] tag[2] */
+ int i = 0;
+
+ switch (fcall->id) {
+ default:
+ eprintk(KERN_ERR, "bad msg type %d\n", fcall->id);
+ return 0;
+ case TVERSION: /* msize[4] version[s] */
+ size += 4 + 2 + strlen(fcall->params.tversion.version);
+ break;
+ case TAUTH: /* afid[4] uname[s] aname[s] */
+ size += 4 + 2 + strlen(fcall->params.tauth.uname) +
+ 2 + strlen(fcall->params.tauth.aname);
+ break;
+ case TFLUSH: /* oldtag[2] */
+ size += 2;
+ break;
+ case TATTACH: /* fid[4] afid[4] uname[s] aname[s] */
+ size += 4 + 4 + 2 + strlen(fcall->params.tattach.uname) +
+ 2 + strlen(fcall->params.tattach.aname);
+ break;
+ case TWALK: /* fid[4] newfid[4] nwname[2] nwname*(wname[s]) */
+ size += 4 + 4 + 2;
+ /* now compute total for the array of names */
+ for (i = 0; i < fcall->params.twalk.nwname; i++)
+ size += 2 + strlen(fcall->params.twalk.wnames[i]);
+ break;
+ case TOPEN: /* fid[4] mode[1] */
+ size += 4 + 1;
+ break;
+ case TCREATE: /* fid[4] name[s] perm[4] mode[1] */
+ size += 4 + 2 + strlen(fcall->params.tcreate.name) + 4 + 1;
+ break;
+ case TREAD: /* fid[4] offset[8] count[4] */
+ size += 4 + 8 + 4;
+ break;
+ case TWRITE: /* fid[4] offset[8] count[4] data[count] */
+ size += 4 + 8 + 4 + fcall->params.twrite.count;
+ break;
+ case TCLUNK: /* fid[4] */
+ size += 4;
+ break;
+ case TREMOVE: /* fid[4] */
+ size += 4;
+ break;
+ case TSTAT: /* fid[4] */
+ size += 4;
+ break;
+ case TWSTAT: /* fid[4] stat[n] */
+ fcall->params.twstat.stat->size =
+ v9fs_size_stat(v9ses, fcall->params.twstat.stat);
+ size += 4 + 2 + 2 + fcall->params.twstat.stat->size;
+ }
+ return size;
+}
+
+/*
+ * v9fs_serialize_fcall - marshall fcall struct into a packet
+ * @v9ses: session information
+ * @fcall: structure to convert
+ * @data: buffer to serialize fcall into
+ * @datalen: length of buffer to serialize fcall into
+ *
+ */
+
+int
+v9fs_serialize_fcall(struct v9fs_session_info *v9ses, struct v9fs_fcall *fcall,
+ void *data, u32 datalen)
+{
+ int i = 0;
+ struct v9fs_stat *stat = NULL;
+ struct cbuf buffer;
+ struct cbuf *bufp = &buffer;
+
+ buf_init(bufp, data, datalen);
+
+ if (!fcall) {
+ eprintk(KERN_ERR, "no fcall\n");
+ return -EINVAL;
+ }
+
+ fcall->size = v9fs_size_fcall(v9ses, fcall);
+
+ buf_put_int32(bufp, fcall->size);
+ buf_put_int8(bufp, fcall->id);
+ buf_put_int16(bufp, fcall->tag);
+
+ dprintk(DEBUG_CONV, "size %d id %d tag %d\n", fcall->size, fcall->id,
+ fcall->tag);
+
+ /* now encode it */
+ switch (fcall->id) {
+ default:
+ eprintk(KERN_ERR, "bad msg type: %d\n", fcall->id);
+ return -EPROTO;
+ case TVERSION:
+ buf_put_int32(bufp, fcall->params.tversion.msize);
+ buf_put_string(bufp, fcall->params.tversion.version);
+ break;
+ case TAUTH:
+ buf_put_int32(bufp, fcall->params.tauth.afid);
+ buf_put_string(bufp, fcall->params.tauth.uname);
+ buf_put_string(bufp, fcall->params.tauth.aname);
+ break;
+ case TFLUSH:
+ buf_put_int16(bufp, fcall->params.tflush.oldtag);
+ break;
+ case TATTACH:
+ buf_put_int32(bufp, fcall->params.tattach.fid);
+ buf_put_int32(bufp, fcall->params.tattach.afid);
+ buf_put_string(bufp, fcall->params.tattach.uname);
+ buf_put_string(bufp, fcall->params.tattach.aname);
+ break;
+ case TWALK:
+ buf_put_int32(bufp, fcall->params.twalk.fid);
+ buf_put_int32(bufp, fcall->params.twalk.newfid);
+ buf_put_int16(bufp, fcall->params.twalk.nwname);
+ for (i = 0; i < fcall->params.twalk.nwname; i++)
+ buf_put_string(bufp, fcall->params.twalk.wnames[i]);
+ break;
+ case TOPEN:
+ buf_put_int32(bufp, fcall->params.topen.fid);
+ buf_put_int8(bufp, fcall->params.topen.mode);
+ break;
+ case TCREATE:
+ buf_put_int32(bufp, fcall->params.tcreate.fid);
+ buf_put_string(bufp, fcall->params.tcreate.name);
+ buf_put_int32(bufp, fcall->params.tcreate.perm);
+ buf_put_int8(bufp, fcall->params.tcreate.mode);
+ break;
+ case TREAD:
+ buf_put_int32(bufp, fcall->params.tread.fid);
+ buf_put_int64(bufp, fcall->params.tread.offset);
+ buf_put_int32(bufp, fcall->params.tread.count);
+ break;
+ case TWRITE:
+ buf_put_int32(bufp, fcall->params.twrite.fid);
+ buf_put_int64(bufp, fcall->params.twrite.offset);
+ buf_put_int32(bufp, fcall->params.twrite.count);
+ buf_put_data(bufp, fcall->params.twrite.data,
+ fcall->params.twrite.count);
+ break;
+ case TCLUNK:
+ buf_put_int32(bufp, fcall->params.tclunk.fid);
+ break;
+ case TREMOVE:
+ buf_put_int32(bufp, fcall->params.tremove.fid);
+ break;
+ case TSTAT:
+ buf_put_int32(bufp, fcall->params.tstat.fid);
+ break;
+ case TWSTAT:
+ buf_put_int32(bufp, fcall->params.twstat.fid);
+ stat = fcall->params.twstat.stat;
+
+ buf_put_int16(bufp, stat->size + 2);
+ serialize_stat(v9ses, stat, bufp);
+ break;
+ }
+
+ if (buf_check_overflow(bufp))
+ return -EIO;
+
+ return fcall->size;
+}
+
+/**
+ * deserialize_fcall - unmarshal a response
+ * @v9ses: session information
+ * @msgsize: size of rcall message
+ * @buf: recieved buffer
+ * @buflen: length of received buffer
+ * @rcall: fcall structure to populate
+ * @rcalllen: length of fcall structure to populate
+ *
+ */
+
+int
+v9fs_deserialize_fcall(struct v9fs_session_info *v9ses, u32 msgsize,
+ void *buf, u32 buflen, struct v9fs_fcall *rcall,
+ int rcalllen)
+{
+
+ struct cbuf buffer;
+ struct cbuf *bufp = &buffer;
+ struct cbuf dbuffer;
+ struct cbuf *dbufp = &dbuffer;
+ int i = 0;
+
+ buf_init(bufp, buf, buflen);
+ buf_init(dbufp, (char *)rcall + sizeof(struct v9fs_fcall),
+ rcalllen - sizeof(struct v9fs_fcall));
+
+ rcall->size = msgsize;
+ rcall->id = buf_get_int8(bufp);
+ rcall->tag = buf_get_int16(bufp);
+
+ dprintk(DEBUG_CONV, "size %d id %d tag %d\n", rcall->size, rcall->id,
+ rcall->tag);
+ switch (rcall->id) {
+ default:
+ eprintk(KERN_ERR, "unknown message type: %d\n", rcall->id);
+ return -EPROTO;
+ case RVERSION:
+ rcall->params.rversion.msize = buf_get_int32(bufp);
+ rcall->params.rversion.version = buf_get_stringb(bufp, dbufp);
+ break;
+ case RFLUSH:
+ break;
+ case RATTACH:
+ rcall->params.rattach.qid.type = buf_get_int8(bufp);
+ rcall->params.rattach.qid.version = buf_get_int32(bufp);
+ rcall->params.rattach.qid.path = buf_get_int64(bufp);
+ break;
+ case RWALK:
+ rcall->params.rwalk.nwqid = buf_get_int16(bufp);
+ rcall->params.rwalk.wqids = buf_alloc(bufp,
+ rcall->params.rwalk.nwqid * sizeof(struct v9fs_qid));
+ if (rcall->params.rwalk.wqids)
+ for (i = 0; i < rcall->params.rwalk.nwqid; i++) {
+ rcall->params.rwalk.wqids[i].type =
+ buf_get_int8(bufp);
+ rcall->params.rwalk.wqids[i].version =
+ buf_get_int16(bufp);
+ rcall->params.rwalk.wqids[i].path =
+ buf_get_int64(bufp);
+ }
+ break;
+ case ROPEN:
+ rcall->params.ropen.qid.type = buf_get_int8(bufp);
+ rcall->params.ropen.qid.version = buf_get_int32(bufp);
+ rcall->params.ropen.qid.path = buf_get_int64(bufp);
+ rcall->params.ropen.iounit = buf_get_int32(bufp);
+ break;
+ case RCREATE:
+ rcall->params.rcreate.qid.type = buf_get_int8(bufp);
+ rcall->params.rcreate.qid.version = buf_get_int32(bufp);
+ rcall->params.rcreate.qid.path = buf_get_int64(bufp);
+ rcall->params.rcreate.iounit = buf_get_int32(bufp);
+ break;
+ case RREAD:
+ rcall->params.rread.count = buf_get_int32(bufp);
+ rcall->params.rread.data = buf_get_datab(bufp, dbufp,
+ rcall->params.rread.count);
+ break;
+ case RWRITE:
+ rcall->params.rwrite.count = buf_get_int32(bufp);
+ break;
+ case RCLUNK:
+ break;
+ case RREMOVE:
+ break;
+ case RSTAT:
+ buf_get_int16(bufp);
+ rcall->params.rstat.stat =
+ deserialize_statb(v9ses, bufp, dbufp);
+ break;
+ case RWSTAT:
+ break;
+ case RERROR:
+ rcall->params.rerror.error = buf_get_stringb(bufp, dbufp);
+ if (v9ses->extended)
+ rcall->params.rerror.errno = buf_get_int16(bufp);
+ break;
+ }
+
+ if (buf_check_overflow(bufp) || buf_check_overflow(dbufp))
+ return -EIO;
+
+ return rcall->size;
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.