[Bug 1862415] [NEW] -nic user cannot receive TFTP response from outside

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[Bug 1862415] [NEW] -nic user cannot receive TFTP response from outside

From:	yw662
Subject:	[Bug 1862415] [NEW] -nic user cannot receive TFTP response from outside on windows 10 host
Date:	Fri, 07 Feb 2020 19:58:18 -0000
Public bug reported:

Configuration:
qemu is on a windows 10 host, address 192.168.1.24
A tftp server, which is atftpd, is at address 192.168.1.31
a guest is started by: 
```
.\qemu-system-x86_64.exe -accel hax \
-nic 
user,id=n1,tftp-server-name=192.168.1.31,bootfile=tftp://192.168.1.31/grub/i386-pc/core.0
 \
-object filter-dump,id=f1,netdev=n1,file=dump.dat
```

qemu v4.2.0-11797-g2890edc853-dirty, from https://qemu.weilnetz.de/w64/
windows 10 1909 18363.628

Here is the captured traffic from dump.dat, no filter applied:
No.     Time    Source  Destination     Protocol        Length  Info
1       0.000000        0.0.0.0 255.255.255.255 DHCP    439     DHCP Discover - 
Transaction ID 0xdb38340e
2       0.000081        10.0.2.2        255.255.255.255 DHCP    590     DHCP 
Offer    - Transaction ID 0xdb38340e
3       1.035670        0.0.0.0 255.255.255.255 DHCP    439     DHCP Discover - 
Transaction ID 0xdb38340e
4       1.035693        10.0.2.2        255.255.255.255 DHCP    590     DHCP 
Offer    - Transaction ID 0xdb38340e
5       3.068055        0.0.0.0 255.255.255.255 DHCP    451     DHCP Request  - 
Transaction ID 0xdb38340e
6       3.068099        10.0.2.2        255.255.255.255 DHCP    590     DHCP 
ACK      - Transaction ID 0xdb38340e
7       3.068209        RealtekU_12:34:56       Broadcast       ARP     42      
ARP Announcement for 10.0.2.15
8       3.148419        RealtekU_12:34:56       Broadcast       ARP     42      
Who has 10.0.2.2? Tell 10.0.2.15
9       3.148449        52:55:0a:00:02:02       RealtekU_12:34:56       ARP     
64      10.0.2.2 is at 52:55:0a:00:02:02
10      3.148511        10.0.2.15       192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
11      3.398093        10.0.2.15       192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
12      3.946041        10.0.2.15       192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
13      4.990262        10.0.2.15       192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
14      7.022839        10.0.2.15       192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
15      11.087041       10.0.2.15       192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0


Here is the captured traffic at host NIC, filered by from or to 192.168.1.31
No.     Time    Source  Destination     Protocol        Length  Info
14140   57.729066       192.168.1.24    192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
14141   57.732988       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
14255   57.977995       192.168.1.24    192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
14256   57.979876       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
14275   58.525939       192.168.1.24    192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
14276   58.527819       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
14328   59.570178       192.168.1.24    192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
14329   59.581024       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
14383   61.602742       192.168.1.24    192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
14384   61.605554       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
14730   62.736572       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
14741   62.987924       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
14756   63.533477       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
14815   64.577653       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
14916   65.666959       192.168.1.24    192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
14917   65.668778       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
15235   66.615186       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
15481   67.745250       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
15509   67.991523       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
15566   68.539050       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
16691   69.583531       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
17457   70.675366       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
17599   71.615337       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
17904   72.747338       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
18012   72.995681       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
18192   73.544257       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
18360   74.588002       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
18981   75.679037       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
19270   76.620528       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
19839   77.752338       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
19852   78.001267       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
19917   78.548965       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
20066   79.593232       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
20140   80.684604       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
20220   81.625996       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
20537   82.824574       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
20551   83.033318       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
20607   83.555510       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
20734   84.598612       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
20816   85.691535       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
20898   86.631036       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
22311   90.695296       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432

>From the traffic, the guest sent the request properly, and it is
rerouted outside properly, and the server respond to it properly.
However, the guest never received the response.

** Affects: qemu
     Importance: Undecided
         Status: New

-- 
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https://bugs.launchpad.net/bugs/1862415

Title:
  -nic user cannot receive TFTP response from outside on windows 10 host

Status in QEMU:
  New

Bug description:
  Configuration:
  qemu is on a windows 10 host, address 192.168.1.24
  A tftp server, which is atftpd, is at address 192.168.1.31
  a guest is started by: 
  ```
  .\qemu-system-x86_64.exe -accel hax \
  -nic 
user,id=n1,tftp-server-name=192.168.1.31,bootfile=tftp://192.168.1.31/grub/i386-pc/core.0
 \
  -object filter-dump,id=f1,netdev=n1,file=dump.dat
  ```

  qemu v4.2.0-11797-g2890edc853-dirty, from https://qemu.weilnetz.de/w64/
  windows 10 1909 18363.628

  Here is the captured traffic from dump.dat, no filter applied:
  No.   Time    Source  Destination     Protocol        Length  Info
  1     0.000000        0.0.0.0 255.255.255.255 DHCP    439     DHCP Discover - 
Transaction ID 0xdb38340e
  2     0.000081        10.0.2.2        255.255.255.255 DHCP    590     DHCP 
Offer    - Transaction ID 0xdb38340e
  3     1.035670        0.0.0.0 255.255.255.255 DHCP    439     DHCP Discover - 
Transaction ID 0xdb38340e
  4     1.035693        10.0.2.2        255.255.255.255 DHCP    590     DHCP 
Offer    - Transaction ID 0xdb38340e
  5     3.068055        0.0.0.0 255.255.255.255 DHCP    451     DHCP Request  - 
Transaction ID 0xdb38340e
  6     3.068099        10.0.2.2        255.255.255.255 DHCP    590     DHCP 
ACK      - Transaction ID 0xdb38340e
  7     3.068209        RealtekU_12:34:56       Broadcast       ARP     42      
ARP Announcement for 10.0.2.15
  8     3.148419        RealtekU_12:34:56       Broadcast       ARP     42      
Who has 10.0.2.2? Tell 10.0.2.15
  9     3.148449        52:55:0a:00:02:02       RealtekU_12:34:56       ARP     
64      10.0.2.2 is at 52:55:0a:00:02:02
  10    3.148511        10.0.2.15       192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
  11    3.398093        10.0.2.15       192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
  12    3.946041        10.0.2.15       192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
  13    4.990262        10.0.2.15       192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
  14    7.022839        10.0.2.15       192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
  15    11.087041       10.0.2.15       192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0

  
  Here is the captured traffic at host NIC, filered by from or to 192.168.1.31
  No.   Time    Source  Destination     Protocol        Length  Info
  14140 57.729066       192.168.1.24    192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
  14141 57.732988       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  14255 57.977995       192.168.1.24    192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
  14256 57.979876       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  14275 58.525939       192.168.1.24    192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
  14276 58.527819       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  14328 59.570178       192.168.1.24    192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
  14329 59.581024       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  14383 61.602742       192.168.1.24    192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
  14384 61.605554       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  14730 62.736572       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  14741 62.987924       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  14756 63.533477       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  14815 64.577653       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  14916 65.666959       192.168.1.24    192.168.1.31    TFTP    91      Read 
Request, File: grub/i386-pc/core.0, Transfer type: octet, blksize=1432, tsize=0
  14917 65.668778       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  15235 66.615186       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  15481 67.745250       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  15509 67.991523       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  15566 68.539050       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  16691 69.583531       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  17457 70.675366       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  17599 71.615337       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  17904 72.747338       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  18012 72.995681       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  18192 73.544257       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  18360 74.588002       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  18981 75.679037       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  19270 76.620528       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  19839 77.752338       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  19852 78.001267       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  19917 78.548965       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  20066 79.593232       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  20140 80.684604       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  20220 81.625996       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  20537 82.824574       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  20551 83.033318       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  20607 83.555510       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  20734 84.598612       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  20816 85.691535       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  20898 86.631036       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432
  22311 90.695296       192.168.1.31    192.168.1.24    TFTP    69      Option 
Acknowledgement, tsize=45542, blksize=1432

  From the traffic, the guest sent the request properly, and it is
  rerouted outside properly, and the server respond to it properly.
  However, the guest never received the response.

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