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![Matthew Wilcox](/assets/img/avatar_default.png)
This is a false positive when grepping ... change it to be what the NFS code looks like now. Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
818 lines
20 KiB
C
818 lines
20 KiB
C
/*
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* request.c
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*
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* Copyright (C) 2001 by Urban Widmark
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*
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* Please add a note about your changes to smbfs in the ChangeLog file.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/net.h>
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#include <linux/sched.h>
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#include <linux/smb_fs.h>
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#include <linux/smbno.h>
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#include <linux/smb_mount.h>
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#include "smb_debug.h"
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#include "request.h"
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#include "proto.h"
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/* #define SMB_SLAB_DEBUG (SLAB_RED_ZONE | SLAB_POISON) */
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#define SMB_SLAB_DEBUG 0
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/* cache for request structures */
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static struct kmem_cache *req_cachep;
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static int smb_request_send_req(struct smb_request *req);
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/*
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/proc/slabinfo:
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name, active, num, objsize, active_slabs, num_slaps, #pages
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*/
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int smb_init_request_cache(void)
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{
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req_cachep = kmem_cache_create("smb_request",
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sizeof(struct smb_request), 0,
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SMB_SLAB_DEBUG | SLAB_HWCACHE_ALIGN,
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NULL);
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if (req_cachep == NULL)
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return -ENOMEM;
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return 0;
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}
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void smb_destroy_request_cache(void)
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{
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kmem_cache_destroy(req_cachep);
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}
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/*
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* Allocate and initialise a request structure
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*/
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static struct smb_request *smb_do_alloc_request(struct smb_sb_info *server,
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int bufsize)
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{
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struct smb_request *req;
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unsigned char *buf = NULL;
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req = kmem_cache_zalloc(req_cachep, GFP_KERNEL);
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VERBOSE("allocating request: %p\n", req);
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if (!req)
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goto out;
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if (bufsize > 0) {
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buf = kmalloc(bufsize, GFP_NOFS);
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if (!buf) {
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kmem_cache_free(req_cachep, req);
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return NULL;
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}
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}
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req->rq_buffer = buf;
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req->rq_bufsize = bufsize;
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req->rq_server = server;
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init_waitqueue_head(&req->rq_wait);
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INIT_LIST_HEAD(&req->rq_queue);
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atomic_set(&req->rq_count, 1);
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out:
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return req;
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}
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struct smb_request *smb_alloc_request(struct smb_sb_info *server, int bufsize)
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{
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struct smb_request *req = NULL;
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for (;;) {
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atomic_inc(&server->nr_requests);
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if (atomic_read(&server->nr_requests) <= MAX_REQUEST_HARD) {
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req = smb_do_alloc_request(server, bufsize);
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if (req != NULL)
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break;
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}
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#if 0
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/*
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* Try to free up at least one request in order to stay
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* below the hard limit
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*/
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if (nfs_try_to_free_pages(server))
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continue;
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if (fatal_signal_pending(current))
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return ERR_PTR(-ERESTARTSYS);
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current->policy = SCHED_YIELD;
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schedule();
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#else
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/* FIXME: we want something like nfs does above, but that
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requires changes to all callers and can wait. */
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break;
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#endif
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}
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return req;
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}
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static void smb_free_request(struct smb_request *req)
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{
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atomic_dec(&req->rq_server->nr_requests);
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if (req->rq_buffer && !(req->rq_flags & SMB_REQ_STATIC))
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kfree(req->rq_buffer);
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kfree(req->rq_trans2buffer);
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kmem_cache_free(req_cachep, req);
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}
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/*
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* What prevents a rget to race with a rput? The count must never drop to zero
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* while it is in use. Only rput if it is ok that it is free'd.
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*/
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static void smb_rget(struct smb_request *req)
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{
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atomic_inc(&req->rq_count);
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}
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void smb_rput(struct smb_request *req)
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{
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if (atomic_dec_and_test(&req->rq_count)) {
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list_del_init(&req->rq_queue);
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smb_free_request(req);
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}
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}
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/* setup to receive the data part of the SMB */
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static int smb_setup_bcc(struct smb_request *req)
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{
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int result = 0;
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req->rq_rlen = smb_len(req->rq_header) + 4 - req->rq_bytes_recvd;
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if (req->rq_rlen > req->rq_bufsize) {
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PARANOIA("Packet too large %d > %d\n",
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req->rq_rlen, req->rq_bufsize);
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return -ENOBUFS;
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}
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req->rq_iov[0].iov_base = req->rq_buffer;
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req->rq_iov[0].iov_len = req->rq_rlen;
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req->rq_iovlen = 1;
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return result;
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}
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/*
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* Prepare a "normal" request structure.
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*/
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static int smb_setup_request(struct smb_request *req)
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{
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int len = smb_len(req->rq_header) + 4;
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req->rq_slen = len;
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/* if we expect a data part in the reply we set the iov's to read it */
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if (req->rq_resp_bcc)
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req->rq_setup_read = smb_setup_bcc;
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/* This tries to support re-using the same request */
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req->rq_bytes_sent = 0;
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req->rq_rcls = 0;
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req->rq_err = 0;
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req->rq_errno = 0;
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req->rq_fragment = 0;
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kfree(req->rq_trans2buffer);
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req->rq_trans2buffer = NULL;
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return 0;
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}
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/*
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* Prepare a transaction2 request structure
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*/
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static int smb_setup_trans2request(struct smb_request *req)
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{
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struct smb_sb_info *server = req->rq_server;
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int mparam, mdata;
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static unsigned char padding[4];
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/* I know the following is very ugly, but I want to build the
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smb packet as efficiently as possible. */
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const int smb_parameters = 15;
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const int header = SMB_HEADER_LEN + 2 * smb_parameters + 2;
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const int oparam = ALIGN(header + 3, sizeof(u32));
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const int odata = ALIGN(oparam + req->rq_lparm, sizeof(u32));
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const int bcc = (req->rq_data ? odata + req->rq_ldata :
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oparam + req->rq_lparm) - header;
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if ((bcc + oparam) > server->opt.max_xmit)
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return -ENOMEM;
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smb_setup_header(req, SMBtrans2, smb_parameters, bcc);
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/*
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* max parameters + max data + max setup == bufsize to make NT4 happy
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* and not abort the transfer or split into multiple responses. It also
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* makes smbfs happy as handling packets larger than the buffer size
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* is extra work.
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*
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* OS/2 is probably going to hate me for this ...
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*/
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mparam = SMB_TRANS2_MAX_PARAM;
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mdata = req->rq_bufsize - mparam;
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mdata = server->opt.max_xmit - mparam - 100;
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if (mdata < 1024) {
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mdata = 1024;
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mparam = 20;
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}
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#if 0
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/* NT/win2k has ~4k max_xmit, so with this we request more than it wants
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to return as one SMB. Useful for testing the fragmented trans2
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handling. */
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mdata = 8192;
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#endif
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WSET(req->rq_header, smb_tpscnt, req->rq_lparm);
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WSET(req->rq_header, smb_tdscnt, req->rq_ldata);
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WSET(req->rq_header, smb_mprcnt, mparam);
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WSET(req->rq_header, smb_mdrcnt, mdata);
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WSET(req->rq_header, smb_msrcnt, 0); /* max setup always 0 ? */
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WSET(req->rq_header, smb_flags, 0);
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DSET(req->rq_header, smb_timeout, 0);
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WSET(req->rq_header, smb_pscnt, req->rq_lparm);
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WSET(req->rq_header, smb_psoff, oparam - 4);
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WSET(req->rq_header, smb_dscnt, req->rq_ldata);
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WSET(req->rq_header, smb_dsoff, req->rq_data ? odata - 4 : 0);
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*(req->rq_header + smb_suwcnt) = 0x01; /* setup count */
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*(req->rq_header + smb_suwcnt + 1) = 0x00; /* reserved */
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WSET(req->rq_header, smb_setup0, req->rq_trans2_command);
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req->rq_iovlen = 2;
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req->rq_iov[0].iov_base = (void *) req->rq_header;
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req->rq_iov[0].iov_len = oparam;
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req->rq_iov[1].iov_base = (req->rq_parm==NULL) ? padding : req->rq_parm;
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req->rq_iov[1].iov_len = req->rq_lparm;
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req->rq_slen = oparam + req->rq_lparm;
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if (req->rq_data) {
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req->rq_iovlen += 2;
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req->rq_iov[2].iov_base = padding;
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req->rq_iov[2].iov_len = odata - oparam - req->rq_lparm;
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req->rq_iov[3].iov_base = req->rq_data;
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req->rq_iov[3].iov_len = req->rq_ldata;
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req->rq_slen = odata + req->rq_ldata;
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}
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/* always a data part for trans2 replies */
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req->rq_setup_read = smb_setup_bcc;
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return 0;
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}
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/*
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* Add a request and tell smbiod to process it
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*/
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int smb_add_request(struct smb_request *req)
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{
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long timeleft;
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struct smb_sb_info *server = req->rq_server;
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int result = 0;
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smb_setup_request(req);
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if (req->rq_trans2_command) {
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if (req->rq_buffer == NULL) {
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PARANOIA("trans2 attempted without response buffer!\n");
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return -EIO;
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}
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result = smb_setup_trans2request(req);
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}
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if (result < 0)
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return result;
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#ifdef SMB_DEBUG_PACKET_SIZE
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add_xmit_stats(req);
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#endif
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/* add 'req' to the queue of requests */
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if (smb_lock_server_interruptible(server))
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return -EINTR;
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/*
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* Try to send the request as the process. If that fails we queue the
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* request and let smbiod send it later.
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*/
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/* FIXME: each server has a number on the maximum number of parallel
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requests. 10, 50 or so. We should not allow more requests to be
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active. */
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if (server->mid > 0xf000)
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server->mid = 0;
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req->rq_mid = server->mid++;
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WSET(req->rq_header, smb_mid, req->rq_mid);
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result = 0;
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if (server->state == CONN_VALID) {
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if (list_empty(&server->xmitq))
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result = smb_request_send_req(req);
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if (result < 0) {
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/* Connection lost? */
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server->conn_error = result;
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server->state = CONN_INVALID;
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}
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}
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if (result != 1)
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list_add_tail(&req->rq_queue, &server->xmitq);
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smb_rget(req);
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if (server->state != CONN_VALID)
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smbiod_retry(server);
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smb_unlock_server(server);
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smbiod_wake_up();
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timeleft = wait_event_interruptible_timeout(req->rq_wait,
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req->rq_flags & SMB_REQ_RECEIVED, 30*HZ);
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if (!timeleft || signal_pending(current)) {
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/*
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* On timeout or on interrupt we want to try and remove the
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* request from the recvq/xmitq.
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* First check if the request is still part of a queue. (May
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* have been removed by some error condition)
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*/
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smb_lock_server(server);
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if (!list_empty(&req->rq_queue)) {
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list_del_init(&req->rq_queue);
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smb_rput(req);
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}
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smb_unlock_server(server);
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}
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if (!timeleft) {
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PARANOIA("request [%p, mid=%d] timed out!\n",
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req, req->rq_mid);
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VERBOSE("smb_com: %02x\n", *(req->rq_header + smb_com));
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VERBOSE("smb_rcls: %02x\n", *(req->rq_header + smb_rcls));
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VERBOSE("smb_flg: %02x\n", *(req->rq_header + smb_flg));
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VERBOSE("smb_tid: %04x\n", WVAL(req->rq_header, smb_tid));
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VERBOSE("smb_pid: %04x\n", WVAL(req->rq_header, smb_pid));
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VERBOSE("smb_uid: %04x\n", WVAL(req->rq_header, smb_uid));
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VERBOSE("smb_mid: %04x\n", WVAL(req->rq_header, smb_mid));
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VERBOSE("smb_wct: %02x\n", *(req->rq_header + smb_wct));
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req->rq_rcls = ERRSRV;
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req->rq_err = ERRtimeout;
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/* Just in case it was "stuck" */
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smbiod_wake_up();
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}
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VERBOSE("woke up, rcls=%d\n", req->rq_rcls);
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if (req->rq_rcls != 0)
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req->rq_errno = smb_errno(req);
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if (signal_pending(current))
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req->rq_errno = -ERESTARTSYS;
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return req->rq_errno;
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}
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/*
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* Send a request and place it on the recvq if successfully sent.
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* Must be called with the server lock held.
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*/
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static int smb_request_send_req(struct smb_request *req)
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{
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struct smb_sb_info *server = req->rq_server;
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int result;
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if (req->rq_bytes_sent == 0) {
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WSET(req->rq_header, smb_tid, server->opt.tid);
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WSET(req->rq_header, smb_pid, 1);
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WSET(req->rq_header, smb_uid, server->opt.server_uid);
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}
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result = smb_send_request(req);
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if (result < 0 && result != -EAGAIN)
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goto out;
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result = 0;
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if (!(req->rq_flags & SMB_REQ_TRANSMITTED))
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goto out;
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list_move_tail(&req->rq_queue, &server->recvq);
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result = 1;
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out:
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return result;
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}
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/*
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* Sends one request for this server. (smbiod)
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* Must be called with the server lock held.
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* Returns: <0 on error
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* 0 if no request could be completely sent
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* 1 if all data for one request was sent
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*/
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int smb_request_send_server(struct smb_sb_info *server)
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{
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struct list_head *head;
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struct smb_request *req;
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int result;
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if (server->state != CONN_VALID)
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return 0;
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/* dequeue first request, if any */
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req = NULL;
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head = server->xmitq.next;
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if (head != &server->xmitq) {
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req = list_entry(head, struct smb_request, rq_queue);
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}
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if (!req)
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return 0;
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result = smb_request_send_req(req);
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if (result < 0) {
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server->conn_error = result;
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list_move(&req->rq_queue, &server->xmitq);
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result = -EIO;
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goto out;
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}
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out:
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return result;
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}
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/*
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* Try to find a request matching this "mid". Typically the first entry will
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* be the matching one.
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*/
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static struct smb_request *find_request(struct smb_sb_info *server, int mid)
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{
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struct list_head *tmp;
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struct smb_request *req = NULL;
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list_for_each(tmp, &server->recvq) {
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req = list_entry(tmp, struct smb_request, rq_queue);
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if (req->rq_mid == mid) {
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break;
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}
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req = NULL;
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}
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if (!req) {
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VERBOSE("received reply with mid %d but no request!\n",
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WVAL(server->header, smb_mid));
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server->rstate = SMB_RECV_DROP;
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}
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return req;
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}
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/*
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* Called when we have read the smb header and believe this is a response.
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*/
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static int smb_init_request(struct smb_sb_info *server, struct smb_request *req)
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{
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int hdrlen, wct;
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memcpy(req->rq_header, server->header, SMB_HEADER_LEN);
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wct = *(req->rq_header + smb_wct);
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if (wct > 20) {
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PARANOIA("wct too large, %d > 20\n", wct);
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server->rstate = SMB_RECV_DROP;
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return 0;
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}
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req->rq_resp_wct = wct;
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hdrlen = SMB_HEADER_LEN + wct*2 + 2;
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VERBOSE("header length: %d smb_wct: %2d\n", hdrlen, wct);
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req->rq_bytes_recvd = SMB_HEADER_LEN;
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req->rq_rlen = hdrlen;
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req->rq_iov[0].iov_base = req->rq_header;
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req->rq_iov[0].iov_len = hdrlen;
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req->rq_iovlen = 1;
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server->rstate = SMB_RECV_PARAM;
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#ifdef SMB_DEBUG_PACKET_SIZE
|
|
add_recv_stats(smb_len(server->header));
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Reads the SMB parameters
|
|
*/
|
|
static int smb_recv_param(struct smb_sb_info *server, struct smb_request *req)
|
|
{
|
|
int result;
|
|
|
|
result = smb_receive(server, req);
|
|
if (result < 0)
|
|
return result;
|
|
if (req->rq_bytes_recvd < req->rq_rlen)
|
|
return 0;
|
|
|
|
VERBOSE("result: %d smb_bcc: %04x\n", result,
|
|
WVAL(req->rq_header, SMB_HEADER_LEN +
|
|
(*(req->rq_header + smb_wct) * 2)));
|
|
|
|
result = 0;
|
|
req->rq_iov[0].iov_base = NULL;
|
|
req->rq_rlen = 0;
|
|
if (req->rq_callback)
|
|
req->rq_callback(req);
|
|
else if (req->rq_setup_read)
|
|
result = req->rq_setup_read(req);
|
|
if (result < 0) {
|
|
server->rstate = SMB_RECV_DROP;
|
|
return result;
|
|
}
|
|
|
|
server->rstate = req->rq_rlen > 0 ? SMB_RECV_DATA : SMB_RECV_END;
|
|
|
|
req->rq_bytes_recvd = 0; // recvd out of the iov
|
|
|
|
VERBOSE("rlen: %d\n", req->rq_rlen);
|
|
if (req->rq_rlen < 0) {
|
|
PARANOIA("Parameters read beyond end of packet!\n");
|
|
server->rstate = SMB_RECV_END;
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Reads the SMB data
|
|
*/
|
|
static int smb_recv_data(struct smb_sb_info *server, struct smb_request *req)
|
|
{
|
|
int result;
|
|
|
|
result = smb_receive(server, req);
|
|
if (result < 0)
|
|
goto out;
|
|
if (req->rq_bytes_recvd < req->rq_rlen)
|
|
goto out;
|
|
server->rstate = SMB_RECV_END;
|
|
out:
|
|
VERBOSE("result: %d\n", result);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Receive a transaction2 response
|
|
* Return: 0 if the response has been fully read
|
|
* 1 if there are further "fragments" to read
|
|
* <0 if there is an error
|
|
*/
|
|
static int smb_recv_trans2(struct smb_sb_info *server, struct smb_request *req)
|
|
{
|
|
unsigned char *inbuf;
|
|
unsigned int parm_disp, parm_offset, parm_count, parm_tot;
|
|
unsigned int data_disp, data_offset, data_count, data_tot;
|
|
int hdrlen = SMB_HEADER_LEN + req->rq_resp_wct*2 - 2;
|
|
|
|
VERBOSE("handling trans2\n");
|
|
|
|
inbuf = req->rq_header;
|
|
data_tot = WVAL(inbuf, smb_tdrcnt);
|
|
parm_tot = WVAL(inbuf, smb_tprcnt);
|
|
parm_disp = WVAL(inbuf, smb_prdisp);
|
|
parm_offset = WVAL(inbuf, smb_proff);
|
|
parm_count = WVAL(inbuf, smb_prcnt);
|
|
data_disp = WVAL(inbuf, smb_drdisp);
|
|
data_offset = WVAL(inbuf, smb_droff);
|
|
data_count = WVAL(inbuf, smb_drcnt);
|
|
|
|
/* Modify offset for the split header/buffer we use */
|
|
if (data_count || data_offset) {
|
|
if (unlikely(data_offset < hdrlen))
|
|
goto out_bad_data;
|
|
else
|
|
data_offset -= hdrlen;
|
|
}
|
|
if (parm_count || parm_offset) {
|
|
if (unlikely(parm_offset < hdrlen))
|
|
goto out_bad_parm;
|
|
else
|
|
parm_offset -= hdrlen;
|
|
}
|
|
|
|
if (parm_count == parm_tot && data_count == data_tot) {
|
|
/*
|
|
* This packet has all the trans2 data.
|
|
*
|
|
* We setup the request so that this will be the common
|
|
* case. It may be a server error to not return a
|
|
* response that fits.
|
|
*/
|
|
VERBOSE("single trans2 response "
|
|
"dcnt=%u, pcnt=%u, doff=%u, poff=%u\n",
|
|
data_count, parm_count,
|
|
data_offset, parm_offset);
|
|
req->rq_ldata = data_count;
|
|
req->rq_lparm = parm_count;
|
|
req->rq_data = req->rq_buffer + data_offset;
|
|
req->rq_parm = req->rq_buffer + parm_offset;
|
|
if (unlikely(parm_offset + parm_count > req->rq_rlen))
|
|
goto out_bad_parm;
|
|
if (unlikely(data_offset + data_count > req->rq_rlen))
|
|
goto out_bad_data;
|
|
return 0;
|
|
}
|
|
|
|
VERBOSE("multi trans2 response "
|
|
"frag=%d, dcnt=%u, pcnt=%u, doff=%u, poff=%u\n",
|
|
req->rq_fragment,
|
|
data_count, parm_count,
|
|
data_offset, parm_offset);
|
|
|
|
if (!req->rq_fragment) {
|
|
int buf_len;
|
|
|
|
/* We got the first trans2 fragment */
|
|
req->rq_fragment = 1;
|
|
req->rq_total_data = data_tot;
|
|
req->rq_total_parm = parm_tot;
|
|
req->rq_ldata = 0;
|
|
req->rq_lparm = 0;
|
|
|
|
buf_len = data_tot + parm_tot;
|
|
if (buf_len > SMB_MAX_PACKET_SIZE)
|
|
goto out_too_long;
|
|
|
|
req->rq_trans2bufsize = buf_len;
|
|
req->rq_trans2buffer = kzalloc(buf_len, GFP_NOFS);
|
|
if (!req->rq_trans2buffer)
|
|
goto out_no_mem;
|
|
|
|
req->rq_parm = req->rq_trans2buffer;
|
|
req->rq_data = req->rq_trans2buffer + parm_tot;
|
|
} else if (unlikely(req->rq_total_data < data_tot ||
|
|
req->rq_total_parm < parm_tot))
|
|
goto out_data_grew;
|
|
|
|
if (unlikely(parm_disp + parm_count > req->rq_total_parm ||
|
|
parm_offset + parm_count > req->rq_rlen))
|
|
goto out_bad_parm;
|
|
if (unlikely(data_disp + data_count > req->rq_total_data ||
|
|
data_offset + data_count > req->rq_rlen))
|
|
goto out_bad_data;
|
|
|
|
inbuf = req->rq_buffer;
|
|
memcpy(req->rq_parm + parm_disp, inbuf + parm_offset, parm_count);
|
|
memcpy(req->rq_data + data_disp, inbuf + data_offset, data_count);
|
|
|
|
req->rq_ldata += data_count;
|
|
req->rq_lparm += parm_count;
|
|
|
|
/*
|
|
* Check whether we've received all of the data. Note that
|
|
* we use the packet totals -- total lengths might shrink!
|
|
*/
|
|
if (req->rq_ldata >= data_tot && req->rq_lparm >= parm_tot) {
|
|
req->rq_ldata = data_tot;
|
|
req->rq_lparm = parm_tot;
|
|
return 0;
|
|
}
|
|
return 1;
|
|
|
|
out_too_long:
|
|
printk(KERN_ERR "smb_trans2: data/param too long, data=%u, parm=%u\n",
|
|
data_tot, parm_tot);
|
|
goto out_EIO;
|
|
out_no_mem:
|
|
printk(KERN_ERR "smb_trans2: couldn't allocate data area of %d bytes\n",
|
|
req->rq_trans2bufsize);
|
|
req->rq_errno = -ENOMEM;
|
|
goto out;
|
|
out_data_grew:
|
|
printk(KERN_ERR "smb_trans2: data/params grew!\n");
|
|
goto out_EIO;
|
|
out_bad_parm:
|
|
printk(KERN_ERR "smb_trans2: invalid parms, disp=%u, cnt=%u, tot=%u, ofs=%u\n",
|
|
parm_disp, parm_count, parm_tot, parm_offset);
|
|
goto out_EIO;
|
|
out_bad_data:
|
|
printk(KERN_ERR "smb_trans2: invalid data, disp=%u, cnt=%u, tot=%u, ofs=%u\n",
|
|
data_disp, data_count, data_tot, data_offset);
|
|
out_EIO:
|
|
req->rq_errno = -EIO;
|
|
out:
|
|
return req->rq_errno;
|
|
}
|
|
|
|
/*
|
|
* State machine for receiving responses. We handle the fact that we can't
|
|
* read the full response in one try by having states telling us how much we
|
|
* have read.
|
|
*
|
|
* Must be called with the server lock held (only called from smbiod).
|
|
*
|
|
* Return: <0 on error
|
|
*/
|
|
int smb_request_recv(struct smb_sb_info *server)
|
|
{
|
|
struct smb_request *req = NULL;
|
|
int result = 0;
|
|
|
|
if (smb_recv_available(server) <= 0)
|
|
return 0;
|
|
|
|
VERBOSE("state: %d\n", server->rstate);
|
|
switch (server->rstate) {
|
|
case SMB_RECV_DROP:
|
|
result = smb_receive_drop(server);
|
|
if (result < 0)
|
|
break;
|
|
if (server->rstate == SMB_RECV_DROP)
|
|
break;
|
|
server->rstate = SMB_RECV_START;
|
|
/* fallthrough */
|
|
case SMB_RECV_START:
|
|
server->smb_read = 0;
|
|
server->rstate = SMB_RECV_HEADER;
|
|
/* fallthrough */
|
|
case SMB_RECV_HEADER:
|
|
result = smb_receive_header(server);
|
|
if (result < 0)
|
|
break;
|
|
if (server->rstate == SMB_RECV_HEADER)
|
|
break;
|
|
if (! (*(server->header + smb_flg) & SMB_FLAGS_REPLY) ) {
|
|
server->rstate = SMB_RECV_REQUEST;
|
|
break;
|
|
}
|
|
if (server->rstate != SMB_RECV_HCOMPLETE)
|
|
break;
|
|
/* fallthrough */
|
|
case SMB_RECV_HCOMPLETE:
|
|
req = find_request(server, WVAL(server->header, smb_mid));
|
|
if (!req)
|
|
break;
|
|
smb_init_request(server, req);
|
|
req->rq_rcls = *(req->rq_header + smb_rcls);
|
|
req->rq_err = WVAL(req->rq_header, smb_err);
|
|
if (server->rstate != SMB_RECV_PARAM)
|
|
break;
|
|
/* fallthrough */
|
|
case SMB_RECV_PARAM:
|
|
if (!req)
|
|
req = find_request(server,WVAL(server->header,smb_mid));
|
|
if (!req)
|
|
break;
|
|
result = smb_recv_param(server, req);
|
|
if (result < 0)
|
|
break;
|
|
if (server->rstate != SMB_RECV_DATA)
|
|
break;
|
|
/* fallthrough */
|
|
case SMB_RECV_DATA:
|
|
if (!req)
|
|
req = find_request(server,WVAL(server->header,smb_mid));
|
|
if (!req)
|
|
break;
|
|
result = smb_recv_data(server, req);
|
|
if (result < 0)
|
|
break;
|
|
break;
|
|
|
|
/* We should never be called with any of these states */
|
|
case SMB_RECV_END:
|
|
case SMB_RECV_REQUEST:
|
|
BUG();
|
|
}
|
|
|
|
if (result < 0) {
|
|
/* We saw an error */
|
|
return result;
|
|
}
|
|
|
|
if (server->rstate != SMB_RECV_END)
|
|
return 0;
|
|
|
|
result = 0;
|
|
if (req->rq_trans2_command && req->rq_rcls == SUCCESS)
|
|
result = smb_recv_trans2(server, req);
|
|
|
|
/*
|
|
* Response completely read. Drop any extra bytes sent by the server.
|
|
* (Yes, servers sometimes add extra bytes to responses)
|
|
*/
|
|
VERBOSE("smb_len: %d smb_read: %d\n",
|
|
server->smb_len, server->smb_read);
|
|
if (server->smb_read < server->smb_len)
|
|
smb_receive_drop(server);
|
|
|
|
server->rstate = SMB_RECV_START;
|
|
|
|
if (!result) {
|
|
list_del_init(&req->rq_queue);
|
|
req->rq_flags |= SMB_REQ_RECEIVED;
|
|
smb_rput(req);
|
|
wake_up_interruptible(&req->rq_wait);
|
|
}
|
|
return 0;
|
|
}
|