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abperiasamy / rtl8812AU_8821AU_linux

rtl8812AU_8821AU linux kernel driver for AC1200 (801.11ac) Wireless Dual-Band USB Adapter
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Truncated IP packets '4 bytes missing!' #70

Open praveenbhamidipati opened 9 years ago

praveenbhamidipati commented 9 years ago

I have purchased D-Link DWA-171. I pulled down the sources from master branch and found that my card DWA-171 (13d3:3394) was not represented in os_dep/linux/usb_intf.c. I added an entry just above DWA-172 corresponding to the USB vendor and device ids of my card, built, installed and restarted to get a wireless interface corresponding to DWA-171.

wlxec22446688AA  IEEE 802.11AC  ESSID:"AbcWiFi"  Nickname:"<WIFI@REALTEK>"
          Mode:Managed  Frequency:5.18 GHz  Access Point: 00:11:33:55:77:99   
          Bit Rate:87 Mb/s   Sensitivity:0/0  
          Retry:off   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=100/100  Signal level=100/100  Noise level=0/100
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

My issue is that 802.11n works just fine, but 802.11 ac has issues when accessing some websites (i am writing this ticket using 802.11ac). The following is what I observed in tcpdump:

23:02:55.749480 IP 192.168.254.196.47797 > 216.58.216.173.443: Flags [S], seq 1355553534, win 29200, options [mss 1460,sackOK,TS val 1802390 ecr 0,nop,wscale 7], length 0
23:02:55.770408 IP 216.58.216.173.443 > 192.168.254.196.47797: Flags [S.], seq 857123418, ack 1355553535, win 42540, options [mss 1430,sackOK,TS val 922849898 ecr 1802390,nop,wscale 7], length 0
23:02:55.770510 IP 192.168.254.196.47797 > 216.58.216.173.443: Flags [.], ack 1, win 229, options [nop,nop,TS val 1802396 ecr 922849898], length 0
23:02:55.939580 IP 192.168.254.196.47797 > 216.58.216.173.443: Flags [P.], seq 1:288, ack 1, win 229, options [nop,nop,TS val 1802438 ecr 922849898], length 287
23:02:55.951147 IP 216.58.216.173.443 > 192.168.254.196.47797: Flags [.], ack 288, win 341, options [nop,nop,TS val 922850088 ecr 1802438], length 0
23:02:55.957441 IP 216.58.216.173.443 > 192.168.254.196.47797: Flags [.], seq 1:1419, ack 288, win 341, options [nop,nop,TS val 922850089 ecr 1802438], length 1418
23:02:55.957518 IP 192.168.254.196.47797 > 216.58.216.173.443: Flags [.], ack 1419, win 251, options [nop,nop,TS val 1802442 ecr 922850089], length 0
23:02:55.957442 IP 216.58.216.173.443 > 192.168.254.196.47797: Flags [.], seq 1419:2837, ack 288, win 341, options [nop,nop,TS val 922850089 ecr 1802438], length 1418
23:02:55.957587 IP 192.168.254.196.47797 > 216.58.216.173.443: Flags [.], ack 2837, win 274, options [nop,nop,TS val 1802442 ecr 922850089], length 0
23:02:55.957443 IP 216.58.216.173.443 > 192.168.254.196.47797: Flags [P.], seq 2837:3542, ack 288, win 341, options [nop,nop,TS val 922850089 ecr 1802438], length 705
23:02:55.957609 IP 192.168.254.196.47797 > 216.58.216.173.443: Flags [.], ack 3542, win 296, options [nop,nop,TS val 1802442 ecr 922850089], length 0
23:02:55.961625 IP 192.168.254.196.47797 > 216.58.216.173.443: Flags [P.], seq 288:363, ack 3542, win 296, options [nop,nop,TS val 1802443 ecr 922850089], length 75
23:02:56.013087 IP 216.58.216.173.443 > 192.168.254.196.47797: Flags [.], ack 363, win 341, options [nop,nop,TS val 922850150 ecr 1802443], length 0
23:02:56.013157 IP 192.168.254.196.47797 > 216.58.216.173.443: Flags [P.], seq 363:414, ack 3542, win 296, options [nop,nop,TS val 1802456 ecr 922850150], length 51
23:02:56.025003 IP 216.58.216.173.443 > 192.168.254.196.47797: Flags [.], ack 414, win 341, options [nop,nop,TS val 922850161 ecr 1802456], length 0
23:02:56.025009 IP 216.58.216.173.443 > 192.168.254.196.47797: Flags [P.], seq 3542:3788, ack 414, win 341, options [nop,nop,TS val 922850161 ecr 1802456], length 246
23:02:56.028251 IP 192.168.254.196.47797 > 216.58.216.173.443: Flags [P.], seq 414:526, ack 3788, win 318, options [nop,nop,TS val 1802460 ecr 922850161], length 112
23:02:56.050160 IP 216.58.216.173.443 > 192.168.254.196.47797: Flags [P.], seq 3788:4500, ack 526, win 341, options [nop,nop,TS val 922850187 ecr 1802460], length 712
23:02:56.050975 IP 192.168.254.196.47797 > 216.58.216.173.443: Flags [P.], seq 526:557, ack 4500, win 340, options [nop,nop,TS val 1802466 ecr 922850187], length 31
23:02:56.061021 IP 216.58.216.173.443 > 192.168.254.196.47797: Flags [F.], seq 4500, ack 557, win 341, options [nop,nop,TS val 922850199 ecr 1802466], length 0
23:02:56.077640 IP 192.168.254.196.47797 > 216.58.216.173.443: Flags [F.], seq 557, ack 4501, win 340, options [nop,nop,TS val 1802472 ecr 922850199], length 0
23:02:56.089389 IP 216.58.216.173.443 > 192.168.254.196.47797: Flags [.], ack 558, win 341, options [nop,nop,TS val 922850226 ecr 1802472], length 0
^C
22 packets captured
22 packets received by filter
0 packets dropped by kernel
23:03:43.491502 IP 192.168.254.196.47798 > 216.58.216.173.443: Flags [S], seq 690414722, win 29200, options [mss 1460,sackOK,TS val 1814326 ecr 0,nop,wscale 7], length 0
23:03:43.498775 IP 216.58.216.173.443 > 192.168.254.196.47798: Flags [S.], seq 2486729204, ack 690414723, win 42540, options [mss 1430,sackOK,TS val 922887422 ecr 1814326,nop,wscale 7], length 0
23:03:43.498878 IP 192.168.254.196.47798 > 216.58.216.173.443: Flags [.], ack 1, win 229, options [nop,nop,TS val 1814328 ecr 922887422], length 0
23:03:43.664859 IP 192.168.254.196.47798 > 216.58.216.173.443: Flags [P.], seq 1:288, ack 1, win 229, options [nop,nop,TS val 1814369 ecr 922887422], length 287
23:03:43.673688 IP 216.58.216.173.443 > 192.168.254.196.47798: Flags [.], ack 288, win 341, options [nop,nop,TS val 922887595 ecr 1814369], length 0
23:03:43.673696 IP 216.58.216.173.443 > 192.168.254.196.47798: Flags [.], seq 1:1419, ack 288, win 341, options [nop,nop,TS val 922887596 ecr 1814369], length 1418
23:03:43.673794 IP 192.168.254.196.47798 > 216.58.216.173.443: Flags [.], ack 1419, win 251, options [nop,nop,TS val 1814371 ecr 922887596], length 0
23:03:43.673704 IP 216.58.216.173.443 > 192.168.254.196.47798: Flags [.], seq 1419:2837, ack 288, win 341, options [nop,nop,TS val 922887596 ecr 1814369], length 1418
23:03:43.673855 IP 192.168.254.196.47798 > 216.58.216.173.443: Flags [.], ack 2837, win 274, options [nop,nop,TS val 1814371 ecr 922887596], length 0
23:03:43.673710 IP 216.58.216.173.443 > 192.168.254.196.47798: Flags [P.], seq 2837:3542, ack 288, win 341, options [nop,nop,TS val 922887596 ecr 1814369], length 705
23:03:43.673880 IP 192.168.254.196.47798 > 216.58.216.173.443: Flags [.], ack 3542, win 296, options [nop,nop,TS val 1814371 ecr 922887596], length 0
23:03:43.677563 IP 192.168.254.196.47798 > 216.58.216.173.443: Flags [P.], seq 288:363, ack 3542, win 296, options [nop,nop,TS val 1814372 ecr 922887596], length 75
23:03:43.752635 IP 216.58.216.173.443 > 192.168.254.196.47798: Flags [.], ack 363, win 341, options [nop,nop,TS val 922887676 ecr 1814372], length 0
23:03:43.752708 IP 192.168.254.196.47798 > 216.58.216.173.443: Flags [P.], seq 363:414, ack 3542, win 296, options [nop,nop,TS val 1814391 ecr 922887676], length 51
23:03:43.759164 IP 216.58.216.173.443 > 192.168.254.196.47798: Flags [.], ack 414, win 341, options [nop,nop,TS val 922887683 ecr 1814391], length 0
23:03:43.759182 IP truncated-ip - 4 bytes missing! 216.58.216.173.443 > 192.168.254.196.47798: Flags [P.], seq 3542:3788, ack 414, win 341, options [nop,nop,TS val 922887683 ecr 1814391], length 246
23:03:43.975616 IP truncated-ip - 4 bytes missing! 216.58.216.173.443 > 192.168.254.196.47798: Flags [P.], seq 3542:3788, ack 414, win 341, options [nop,nop,TS val 922887900 ecr 1814391], length 246
23:03:44.195875 IP truncated-ip - 4 bytes missing! 216.58.216.173.443 > 192.168.254.196.47798: Flags [P.], seq 3542:3788, ack 414, win 341, options [nop,nop,TS val 922888117 ecr 1814391], length 246
23:03:44.633093 IP truncated-ip - 4 bytes missing! 216.58.216.173.443 > 192.168.254.196.47798: Flags [P.], seq 3542:3788, ack 414, win 341, options [nop,nop,TS val 922888551 ecr 1814391], length 246
23:03:45.500508 IP truncated-ip - 4 bytes missing! 216.58.216.173.443 > 192.168.254.196.47798: Flags [P.], seq 3542:3788, ack 414, win 341, options [nop,nop,TS val 922889419 ecr 1814391], length 246
23:03:47.235087 IP truncated-ip - 4 bytes missing! 216.58.216.173.443 > 192.168.254.196.47798: Flags [P.], seq 3542:3788, ack 414, win 341, options [nop,nop,TS val 922891155 ecr 1814391], length 246
23:03:50.711077 IP truncated-ip - 4 bytes missing! 216.58.216.173.443 > 192.168.254.196.47798: Flags [P.], seq 3542:3788, ack 414, win 341, options [nop,nop,TS val 922894627 ecr 1814391], length 246
23:03:57.646681 IP truncated-ip - 4 bytes missing! 216.58.216.173.443 > 192.168.254.196.47798: Flags [P.], seq 3542:3788, ack 414, win 341, options [nop,nop,TS val 922901571 ecr 1814391], length 246
23:04:07.651878 IP truncated-ip - 4 bytes missing! 216.58.216.173.443 > 192.168.254.196.47798: Flags [P.], seq 3542:3788, ack 414, win 341, options [nop,nop,TS val 922911571 ecr 1814391], length 246
23:04:17.660693 IP truncated-ip - 4 bytes missing! 216.58.216.173.443 > 192.168.254.196.47798: Flags [P.], seq 3542:3788, ack 414, win 341, options [nop,nop,TS val 922921571 ecr 1814391], length 246
23:04:27.647558 IP truncated-ip - 4 bytes missing! 216.58.216.173.443 > 192.168.254.196.47798: Flags [P.], seq 3542:3788, ack 414, win 341, options [nop,nop,TS val 922931571 ecr 1814391], length 246
23:04:37.645772 IP truncated-ip - 4 bytes missing! 216.58.216.173.443 > 192.168.254.196.47798: Flags [P.], seq 3542:3788, ack 414, win 341, options [nop,nop,TS val 922941571 ecr 1814391], length 246
23:04:43.758596 IP 192.168.254.196.47798 > 216.58.216.173.443: Flags [.], ack 3542, win 296, options [nop,nop,TS val 1829393 ecr 922887683], length 0
23:04:43.810554 IP 216.58.216.173.443 > 192.168.254.196.47798: Flags [.], ack 414, win 341, options [nop,nop,TS val 922947689 ecr 1814391], length 0
23:05:43.850647 IP 192.168.254.196.47798 > 216.58.216.173.443: Flags [.], ack 3542, win 296, options [nop,nop,TS val 1844416 ecr 922887683], length 0
23:05:43.858085 IP 216.58.216.173.443 > 192.168.254.196.47798: Flags [R], seq 2486732746, win 0, length 0
^C
31 packets captured
31 packets received by filter
0 packets dropped by kernel

Sometimes (strangely I can reproduce this consistently when accessing the above mentioned url), the packets in case of 802.11ac are shown are corrupt 'IP truncated-ip - 4 bytes missing!' and this causes a failure to load some websites, while other websites seem to work fine.

I have seen this problem with both Ubuntu 14.12 kernel and now with 3.19.0-22-generic as well. How do I debug this further?

Additonal Information

The output of lsusb -v is as follows:

Bus 007 Device 002: ID 13d3:3394 IMC Networks
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass          224 Wireless
  bDeviceSubClass         1 Radio Frequency
  bDeviceProtocol         1 Bluetooth
  bMaxPacketSize0        64
  idVendor           0x13d3 IMC Networks
  idProduct          0x3394
  bcdDevice            2.00
  iManufacturer           1
  iProduct                2
  iSerial                 3
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength          177
    bNumInterfaces          2
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower              500mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              4
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0010  1x 16 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              4
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0000  1x 0 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0000  1x 0 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       1
      bNumEndpoints           2
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              4
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0009  1x 9 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0009  1x 9 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       2
      bNumEndpoints           2
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              4
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0011  1x 17 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0011  1x 17 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       3
      bNumEndpoints           2
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              4
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0019  1x 25 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0019  1x 25 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       4
      bNumEndpoints           2
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              4
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0021  1x 33 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0021  1x 33 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       5
      bNumEndpoints           2
      bInterfaceClass       224 Wireless
      bInterfaceSubClass      1 Radio Frequency
      bInterfaceProtocol      1 Bluetooth
      iInterface              4
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0031  1x 49 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0031  1x 49 bytes
        bInterval               1
andrew2412 commented 9 years ago

I have the same issue. I noticed that each packet with length 41, 42, 666, 977 and 1133 bytes are incorrectly receive by adapter. In network N everything goes OK. The problem is with AC network.

mayli commented 6 years ago

having same issue on my 4.9.35+ #1014 Fri Jun 30 14:34:49 BST 2017 armv6l GNU/Linux and 0bda:a811

this is blocking some DHCP replies

00:23:13.081519 IP truncated-ip - 4 bytes missing! (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 360)
    10.x.x.x.bootps > 10.x.x.x.x.bootpc: [no cksum] BOOTP/DHCP, Reply, length 332, xid 0xd581e0bf, Flags [none] (0x0000)