51a87c552d
Now that the new protocol functions are in place, this patch switches the client code to using the new support code. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
537 lines
11 KiB
C
537 lines
11 KiB
C
/*
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* net/9p/protocol.c
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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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/uaccess.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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#ifndef MIN
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#define MIN(a, b) (((a) < (b)) ? (a) : (b))
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#endif
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#ifndef MAX
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#define MAX(a, b) (((a) > (b)) ? (a) : (b))
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#endif
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#ifndef offset_of
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#define offset_of(type, memb) \
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((unsigned long)(&((type *)0)->memb))
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#endif
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#ifndef container_of
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#define container_of(obj, type, memb) \
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((type *)(((char *)obj) - offset_of(type, memb)))
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#endif
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static int
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p9pdu_writef(struct p9_fcall *pdu, int optional, const char *fmt, ...);
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#define PACKET_DEBUG 0
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void
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p9pdu_dump(int way, struct p9_fcall *pdu)
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{
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int i, n;
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u8 *data = pdu->sdata;
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int datalen = pdu->size;
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char buf[255];
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int buflen = 255;
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i = n = 0;
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if (datalen > (buflen-16))
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datalen = buflen-16;
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while (i < datalen) {
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n += scnprintf(buf + n, buflen - n, "%02x ", data[i]);
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if (i%4 == 3)
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n += scnprintf(buf + n, buflen - n, " ");
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if (i%32 == 31)
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n += scnprintf(buf + n, buflen - n, "\n");
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i++;
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}
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n += scnprintf(buf + n, buflen - n, "\n");
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if (way)
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printk(KERN_NOTICE "[[(%d)[ %s\n", datalen, buf);
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else
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printk(KERN_NOTICE "]](%d)] %s\n", datalen, buf);
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}
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EXPORT_SYMBOL(p9pdu_dump);
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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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kfree(stbuf->uid);
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kfree(stbuf->gid);
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kfree(stbuf->muid);
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kfree(stbuf->extension);
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}
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EXPORT_SYMBOL(p9stat_free);
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static 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, const char __user *udata, size_t size)
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{
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size_t len = MIN(pdu->capacity - pdu->size, size);
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int err = copy_from_user(&pdu->sdata[pdu->size], udata, len);
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if (err)
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printk(KERN_WARNING "pdu_write_u returning: %d\n", err);
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pdu->size += len;
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return size - len;
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}
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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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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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? - 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 optional, const char *fmt, 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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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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*val = cpu_to_le16(*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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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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*val = cpu_to_le32(*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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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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*val = cpu_to_le64(*val);
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}
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break;
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case 's':{
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char **ptr = va_arg(ap, char **);
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int16_t len;
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int size;
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errcode = p9pdu_readf(pdu, optional, "w", &len);
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if (errcode)
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break;
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size = MAX(len, 0);
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*ptr = kmalloc(size + 1, GFP_KERNEL);
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if (*ptr == NULL) {
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errcode = -EFAULT;
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break;
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}
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if (pdu_read(pdu, *ptr, size)) {
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errcode = -EFAULT;
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kfree(*ptr);
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*ptr = NULL;
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} else
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(*ptr)[size] = 0;
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}
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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, optional, "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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stbuf->extension = NULL;
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stbuf->n_uid = stbuf->n_gid = stbuf->n_muid =
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-1;
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errcode =
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p9pdu_readf(pdu, optional,
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"wwdQdddqssss?sddd",
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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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int32_t *count = va_arg(ap, int32_t *);
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void **data = va_arg(ap, void **);
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errcode =
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p9pdu_readf(pdu, optional, "d", count);
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if (!errcode) {
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*count =
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MIN(*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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int16_t *nwname = va_arg(ap, int16_t *);
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char ***wnames = va_arg(ap, char ***);
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errcode =
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p9pdu_readf(pdu, optional, "w", nwname);
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if (!errcode) {
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*wnames =
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kmalloc(sizeof(char *) * *nwname,
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GFP_KERNEL);
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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, optional,
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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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int16_t *nwqid = va_arg(ap, int16_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, optional, "w", nwqid);
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if (!errcode) {
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*wqids =
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kmalloc(*nwqid *
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sizeof(struct p9_qid),
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GFP_KERNEL);
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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, optional,
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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 '?':
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if (!optional)
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return 0;
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break;
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default:
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BUG();
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break;
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}
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if (errcode)
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break;
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}
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return errcode;
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}
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int
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p9pdu_vwritef(struct p9_fcall *pdu, int optional, const char *fmt, 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, int);
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if (pdu_write(pdu, &val, sizeof(val)))
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errcode = -EFAULT;
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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, int);
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if (pdu_write(pdu, &val, sizeof(val)))
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errcode = -EFAULT;
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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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if (pdu_write(pdu, &val, sizeof(val)))
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errcode = -EFAULT;
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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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if (pdu_write(pdu, &val, sizeof(val)))
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errcode = -EFAULT;
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}
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break;
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case 's':{
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const char *ptr = va_arg(ap, const char *);
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int16_t len = 0;
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if (ptr)
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len = MIN(strlen(ptr), USHORT_MAX);
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errcode = p9pdu_writef(pdu, optional, "w", len);
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if (!errcode && pdu_write(pdu, ptr, len))
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errcode = -EFAULT;
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}
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break;
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case 'Q':{
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const struct p9_qid *qid =
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va_arg(ap, const struct p9_qid *);
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errcode =
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p9pdu_writef(pdu, optional, "bdq",
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qid->type, qid->version,
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qid->path);
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} break;
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case 'S':{
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const struct p9_wstat *stbuf =
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va_arg(ap, const struct p9_wstat *);
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errcode =
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p9pdu_writef(pdu, optional,
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"wwdQdddqssss?sddd",
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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, stbuf->n_uid,
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stbuf->n_gid, stbuf->n_muid);
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} break;
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case 'D':{
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int32_t count = va_arg(ap, int32_t);
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const void *data = va_arg(ap, const void *);
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errcode =
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p9pdu_writef(pdu, optional, "d", count);
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if (!errcode && pdu_write(pdu, data, count))
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errcode = -EFAULT;
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}
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break;
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case 'U':{
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int32_t count = va_arg(ap, int32_t);
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const char __user *udata =
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va_arg(ap, const void *);
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errcode =
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p9pdu_writef(pdu, optional, "d", count);
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if (!errcode && pdu_write_u(pdu, udata, count))
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errcode = -EFAULT;
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}
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break;
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case 'T':{
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int16_t nwname = va_arg(ap, int);
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const char **wnames = va_arg(ap, const char **);
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errcode =
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p9pdu_writef(pdu, optional, "w", nwname);
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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_writef(pdu, optional,
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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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}
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break;
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case 'R':{
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int16_t nwqid = va_arg(ap, int);
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struct p9_qid *wqids =
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va_arg(ap, struct p9_qid *);
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errcode =
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p9pdu_writef(pdu, optional, "w", nwqid);
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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_writef(pdu, optional,
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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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}
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break;
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case '?':
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if (!optional)
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return 0;
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break;
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default:
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BUG();
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break;
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}
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if (errcode)
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break;
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}
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return errcode;
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}
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int p9pdu_readf(struct p9_fcall *pdu, int optional, const char *fmt, ...)
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{
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va_list ap;
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int ret;
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va_start(ap, fmt);
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ret = p9pdu_vreadf(pdu, optional, fmt, ap);
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va_end(ap);
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return ret;
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}
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static int
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p9pdu_writef(struct p9_fcall *pdu, int optional, const char *fmt, ...)
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{
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va_list ap;
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int ret;
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va_start(ap, fmt);
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ret = p9pdu_vwritef(pdu, optional, fmt, ap);
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va_end(ap);
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return ret;
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}
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int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type)
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{
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return p9pdu_writef(pdu, 0, "dbw", 0, type, tag);
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}
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int p9pdu_finalize(struct p9_fcall *pdu)
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{
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int size = pdu->size;
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int err;
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pdu->size = 0;
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err = p9pdu_writef(pdu, 0, "d", size);
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pdu->size = size;
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if (PACKET_DEBUG)
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p9pdu_dump(0, pdu);
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return err;
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}
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void p9pdu_reset(struct p9_fcall *pdu)
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{
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pdu->offset = 0;
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pdu->size = 0;
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}
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