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Ticket Resolution Summary Owner Reporter
#15256 fixed virtualbox nat doesn't obey mss parameter aojea
Description

Versions 4.X and 5.X of Virtualbox, when using the NAT interface, doesn't obey the mss of the VM and change tthe MSS in the TCP handshake.

To reproduce you only need to modify the MTU of the interface in the VM and do a curl or start other TCP connection:

root@vagrant-ubuntu-trusty-64:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1000 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 08:00:27:19:c3:bf brd ff:ff:ff:ff:ff:ff
    inet 10.0.2.15/24 brd 10.0.2.255 scope global eth0
       valid_lft forever preferred_lft forever

As you can see in the capture inside the VM the SYN has an MSS of 960 meanwhile the answer has 1460

21:25:08.128132 08:00:27:19:c3:bf > 52:54:00:12:35:02, ethertype IPv4 (0x0800), length 74: (tos 0x0, ttl 64, id 36522, offset 0, flags [DF], proto TCP
(6), length 60)
    10.0.2.15.48438 > 216.58.201.131.80: Flags [S], cksum 0xadfb (incorrect -> 0xba07), seq 1793847297, win 19200, options [mss 960,sackOK,TS val 32427
 ecr 0,nop,wscale 7], length 0
21:25:08.138613 52:54:00:12:35:02 > 08:00:27:19:c3:bf, ethertype IPv4 (0x0800), length 60: (tos 0x0, ttl 64, id 796, offset 0, flags [none], proto TCP
(6), length 44)
    216.58.201.131.80 > 10.0.2.15.48438: Flags [S.], cksum 0xb496 (correct), seq 54336001, ack 1793847298, win 65535, options [mss 1460], length 0
21:25:08.138644 08:00:27:19:c3:bf > 52:54:00:12:35:02, ethertype IPv4 (0x0800), length 54: (tos 0x0, ttl 64, id 36523, offset 0, flags [DF], proto TCP
(6), length 40)

The capture from the host reveals that the output packet has MSS 1460 in both connections, thus the most probable is that Virtualbox NAT is modifying the MSS. (the capture has different times, but is the same behaviour always)

17:48:42.795919 Out fc:aa:14:93:94:b0 ethertype IPv4 (0x0800), length 76: (tos 0x0, ttl 64, id 51370, offset 0, flags [DF], proto TCP (6), length 60)
    192.168.30.31.39163 > 216.58.201.131.80: Flags [S], cksum 0x80b4 (incorrect -> 0x77f4), seq 3898897121, win 29200, options [mss 1460,sackOK,TS val
781761099 ecr 0,nop,wscale 7], length 0
17:48:42.806111  In 84:18:88:78:9a:42 ethertype IPv4 (0x0800), length 76: (tos 0x0, ttl 54, id 62615, offset 0, flags [none], proto TCP (6), length 60)
    216.58.201.131.80 > 192.168.30.31.39163: Flags [S.], cksum 0xa1e9 (correct), seq 4238402083, ack 3898897122, win 42540, options [mss 1430,sackOK,TS
 val 172144884 ecr 781761099,nop,wscale 7], length 0

This is not a problem with one VM, but if you use more complex topologies, we are using to emulate an openstack cloud, you have problems because the packets are bigger than the mtu and are dropped in the vms

#15254 duplicate Add new mode for EfiGopMode mea405
Description

Could you add new modes for EfiGopMode, for example for resolution 2560x1440.

Thank you,

#15251 fixed Kernel (4.5.0) failure on VM start th0br0
Description

VM startup repeatedly fails, regardless of the guest OS.

[50763.014158] ------------[ cut here ]------------
[50763.016334] kernel BUG at include/linux/page-flags.h:272!
[50763.018488] invalid opcode: 0000 [#3] SMP 
[50763.020664] Modules linked in: vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) cpufreq_stats rfcomm fuse xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 tun nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_broute bridge stp llc ebtable_filter ebtable_nat ebtables ip6table_raw ip6table_security ip6table_mangle ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_filter ip6_tables iptable_raw iptable_security iptable_mangle iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack bnep vfat fat btusb btrtl uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core videodev media i2c_designware_platform i2c_designware_core dell_wmi snd_soc_skl snd_hda_codec_hdmi snd_soc_skl_ipc
[50763.025429]  snd_soc_sst_ipc snd_soc_sst_dsp dell_led intel_rapl dell_laptop snd_hda_ext_core dcdbas snd_soc_sst_match x86_pkg_temp_thermal snd_soc_core snd_hda_codec_realtek coretemp snd_hda_codec_generic kvm_intel snd_compress snd_pcm_dmaengine kvm ac97_bus dw_dmac_core irqbypass snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_seq snd_seq_device brcmfmac snd_pcm brcmutil joydev cfg80211 snd_timer rtsx_pci_ms memstick snd mei_me soundcore i2c_i801 mei processor_thermal_device idma64 shpchp intel_lpss_pci intel_soc_dts_iosf wmi hci_uart btbcm btqca btintel bluetooth pinctrl_sunrisepoint pinctrl_intel rfkill intel_lpss_acpi intel_lpss int3400_thermal int3403_thermal int340x_thermal_zone acpi_thermal_rel intel_hid acpi_pad sparse_keymap acpi_als tpm_tis kfifo_buf tpm industrialio nfsd auth_rpcgss
[50763.030432]  nfs_acl lockd grace sunrpc dm_crypt rtsx_pci_sdmmc mmc_core i915 crct10dif_pclmul crc32_pclmul crc32c_intel i2c_algo_bit ghash_clmulni_intel drm_kms_helper serio_raw rtsx_pci drm nvme i2c_hid video fjes hid_multitouch
[50763.033000] CPU: 1 PID: 17188 Comm: EMT Tainted: G      D W  OE   4.5.0-0.rc7.git3.1.fc25.x86_64 #1
[50763.035479] Hardware name: Dell Inc. XPS 13 9350/0J07MR, BIOS 1.2.3 01/08/2016
[50763.037931] task: ffff8803e1943300 ti: ffff880145640000 task.ti: ffff880145640000
[50763.040319] RIP: 0010:[<ffffffffa0a7ec28>]  [<ffffffffa0a7ec28>] rtR0MemObjLinuxAllocPages+0x178/0x290 [vboxdrv]
[50763.042798] RSP: 0018:ffff880145643b90  EFLAGS: 00050246
[50763.045177] RAX: 000000000000003c RBX: 0000000000000200 RCX: 0000000000000006
[50763.047569] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8804701ce1e0
[50763.050051] RBP: ffff880145643bc8 R08: 0000000000000001 R09: 0000000000000001
[50763.052565] R10: ffffffff81cb2c16 R11: ffffffff830cb0e8 R12: 0000000000200000
[50763.054988] R13: 00000000024304c2 R14: ffff88023f322010 R15: 0000000000000001
[50763.057911] FS:  00007f3cfbdff700(0000) GS:ffff880470000000(0000) knlGS:0000000000000000
[50763.060392] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[50763.062868] CR2: 0000000000000000 CR3: 00000002972a9000 CR4: 00000000003426e0
[50763.065267] Stack:
[50763.067683]  ffff880145643be0 0000000000200000 ffff880145643c88 ffffffffffffffff
[50763.070152]  0000000000000005 0000000000040296 0000000000200000 ffff880145643c08
[50763.072658]  ffffffffa0a7ed87 ffff8803ffffffb7 ffff8803ee977698 0000000065226c8a
[50763.075093] Call Trace:
[50763.077505]  [<ffffffffa0a7ed87>] rtR0MemObjLinuxAllocPhysSub2+0x47/0xe0 [vboxdrv]
[50763.079865]  [<ffffffffa0a7eee8>] rtR0MemObjLinuxAllocPhysSub+0xc8/0xe0 [vboxdrv]
[50763.082192]  [<ffffffffa0a7f3e9>] rtR0MemObjNativeAllocPhys+0x19/0x20 [vboxdrv]
[50763.084437]  [<ffffffffa0a7ce66>] VBoxHost_RTR0MemObjAllocPhysExTag+0x76/0xb0 [vboxdrv]
[50763.086617]  [<ffffffff813c5ffb>] ? avc_has_extended_perms+0x3b/0x620
[50763.088721]  [<ffffffff8122891d>] ? __might_fault+0x4d/0xa0
[50763.090943]  [<ffffffffa0a70e77>] ? supdrvIOCtl+0x17d7/0x32c0 [vboxdrv]
[50763.093039]  [<ffffffff81228966>] ? __might_fault+0x96/0xa0
[50763.095179]  [<ffffffff8122891d>] ? __might_fault+0x4d/0xa0
[50763.097231]  [<ffffffffa0a6b600>] ? VBoxDrvLinuxIOCtl_5_0_16+0x150/0x250 [vboxdrv]
[50763.099304]  [<ffffffff812a64f4>] ? do_vfs_ioctl+0xa4/0x6d0
[50763.101373]  [<ffffffff812b2cf2>] ? __fget+0x122/0x210
[50763.103400]  [<ffffffff812b2bd5>] ? __fget+0x5/0x210
[50763.105431]  [<ffffffff812a6b99>] ? SyS_ioctl+0x79/0x90
[50763.107494]  [<ffffffff818bb732>] ? entry_SYSCALL_64_fastpath+0x12/0x72
[50763.109574] Code: 40 48 83 c2 08 48 39 c8 75 f0 b9 01 00 00 00 49 8b 7e 50 41 88 4e 40 48 8b 07 f6 c4 40 74 0e 48 c7 c6 88 3d aa a0 e8 28 78 7a e0 <0f> 0b 48 8b 47 20 a8 01 75 ea 31 c0 f0 80 4f 01 04 48 83 c0 01 
[50763.111785] RIP  [<ffffffffa0a7ec28>] rtR0MemObjLinuxAllocPages+0x178/0x290 [vboxdrv]
[50763.113864]  RSP <ffff880145643b90>
[50763.116049] ---[ end trace 7acbc558b74d55ec ]---
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