bugzilla-daemon at netfilter.org
2024-Apr-17 22:01 UTC
[Bug 1747] New: Connection Tracking - TC_DROP in SK_BUFF
https://bugzilla.netfilter.org/show_bug.cgi?id=1747
Bug ID: 1747
Summary: Connection Tracking - TC_DROP in SK_BUFF
Product: netfilter/iptables
Version: unspecified
Hardware: x86_64
OS: other
Status: NEW
Severity: critical
Priority: P5
Component: nf_conntrack
Assignee: netfilter-buglog at lists.netfilter.org
Reporter: gmckee at crusoeenergy.com
Hi,
We are having issues with Connection Tracking / TC and its interaction with
Open vSwitch.
NAME="Rocky Linux"
VERSION="9.3 (Blue Onyx)"
ID="rocky"
ID_LIKE="rhel centos fedora"
VERSION_ID="9.3"
PLATFORM_ID="platform:el9"
PRETTY_NAME="Rocky Linux 9.3 (Blue Onyx)"
ANSI_COLOR="0;32"
LOGO="fedora-logo-icon"
CPE_NAME="cpe:/o:rocky:rocky:9::baseos"
HOME_URL="https://rockylinux.org/"
BUG_REPORT_URL="https://bugs.rockylinux.org/"
SUPPORT_END="2032-05-31"
ROCKY_SUPPORT_PRODUCT="Rocky-Linux-9"
ROCKY_SUPPORT_PRODUCT_VERSION="9.3"
REDHAT_SUPPORT_PRODUCT="Rocky Linux"
REDHAT_SUPPORT_PRODUCT_VERSION="9.3"
uname -r
5.14.0-362.8.1.el9_3.x86_64
[root at vaeq-cu2b-r109-prod-hv-03 cloud-user]# modinfo openvswitch
filename:
/lib/modules/5.14.0-362.8.1.el9_3.x86_64/kernel/net/openvswitch/openvswitch.ko.xz
alias: net-pf-16-proto-16-family-ovs_ct_limit
alias: net-pf-16-proto-16-family-ovs_meter
alias: net-pf-16-proto-16-family-ovs_packet
alias: net-pf-16-proto-16-family-ovs_flow
alias: net-pf-16-proto-16-family-ovs_vport
alias: net-pf-16-proto-16-family-ovs_datapath
license: GPL
description: Open vSwitch switching datapath
rhelversion: 9.3
srcversion: 8A2159D727C8BADC82261B8
depends: nf_conntrack,nf_conncount,libcrc32c,nf_nat
retpoline: Y
intree: Y
name: openvswitch
vermagic: 5.14.0-362.8.1.el9_3.x86_64 SMP preempt mod_unload modversions
sig_id: PKCS#7
signer: Rocky kernel signing key
sig_key: 17:CA:DE:1F:EC:D1:59:2D:9F:52:34:C6:7C:09:06:81:3D:74:7C:F7
sig_hashalgo: sha256
signature: 67:31:56:70:86:DB:57:69:8D:4A:9B:A7:ED:17:F3:67:65:98:97:08:
1F:FB:4D:F8:A8:2D:7C:A7:7D:3A:57:85:CA:67:9D:82:72:EB:54:14:
F2:BB:40:78:AD:85:56:2D:EF:D5:00:95:38:A4:86:9F:5F:29:1A:81:
32:94:B4:87:41:94:A0:3E:71:A5:97:44:2E:42:DD:F7:42:6B:69:94:
E3:AB:6E:E5:4F:C9:60:57:70:07:5F:CA:C7:83:7A:2F:C7:81:62:FF:
53:AF:AC:2B:06:D8:08:D3:1D:A7:F0:43:10:98:DE:B1:62:AE:89:A5:
FE:EF:74:09:0F:2D:0F:D9:73:A5:59:75:D0:87:1E:EA:3A:40:86:1E:
76:E5:E7:3B:59:2E:3A:7E:65:F3:92:A1:B4:84:48:3F:43:A0:D7:1C:
21:29:E0:B6:D1:10:36:15:88:43:6A:11:8F:55:EE:1B:F9:53:3B:86:
EF:81:71:17:81:08:EC:53:30:D6:69:8E:13:11:D5:DF:15:75:88:50:
69:19:51:3B:41:6B:6F:E0:7A:30:33:32:E6:60:18:02:A6:0C:63:9B:
C5:D7:2F:6A:D0:BA:45:03:19:0E:21:E8:18:FB:E8:D1:C1:33:05:36:
1F:9B:0F:29:3F:05:51:7A:30:86:88:B7:C7:44:2E:2B:50:F9:EF:4F:
D4:70:EA:1B:33:E2:F0:E3:E2:88:00:E5:BF:06:E2:D4:B7:81:EE:6E:
89:02:18:65:8B:1C:84:42:2F:89:14:63:1D:51:70:37:42:C5:68:DD:
4D:12:7B:07:33:2B:C6:BC:8F:7F:23:D7:58:DF:47:AC:DE:08:67:FE:
CB:E8:E6:4D:95:2F:6B:F5:07:4D:32:92:80:0A:7C:D1:B6:81:EE:AB:
26:C3:C6:22:77:00:5E:64:DE:96:0E:9F:A4:A0:F0:45:9F:19:73:EB:
CC:60:AE:E9:63:E2:6D:2E:BA:65:9B:BD:04:CC:13:C2:55:88:05:03:
1B:30:18:8B
I'm not sure where this is failing right now
Let me explain the issue .
We send a TCP connection to download a file over a TLS connection
What we see is the session gets established , but look at frame 14 , this
traffic is part of the same session , but its not being NATTED (172.27.18.244 -
this is private IP of the VM). Its unclear to me why this would happen.
```
No. Time Source Destination Protocol
Length Info Delta
4 09:23:40.660635 204.52.24.116 104.18.2.35 TCP
70 57394 ? 443 [SYN] Seq=0 Win=42340 Len=0 MSS=1460 SACK_PERM WS=4096
10.014701
Frame 4: 70 bytes on wire (560 bits), 70 bytes captured (560 bits)
Ethernet II, Src: 4e:42:14:a1:2a:fb (4e:42:14:a1:2a:fb), Dst: IETF-VRRP-VRID_ff
(00:00:5e:00:01:ff)
802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 120
Internet Protocol Version 4, Src: 204.52.24.116, Dst: 104.18.2.35
Transmission Control Protocol, Src Port: 57394, Dst Port: 443, Seq: 0, Len: 0
No. Time Source Destination Protocol
Length Info Delta
5 09:23:40.666095 104.18.2.35 204.52.24.116 TCP
66 443 ? 57394 [SYN, ACK] Seq=0 Ack=1 Win=64240 Len=0 MSS=1400 SACK_PERM
WS=8192 0.005460
Frame 5: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: Mellanox_4a:c0:fd (9c:05:91:4a:c0:fd), Dst: 4e:42:14:a1:2a:fb
(4e:42:14:a1:2a:fb)
Internet Protocol Version 4, Src: 104.18.2.35, Dst: 204.52.24.116
Transmission Control Protocol, Src Port: 443, Dst Port: 57394, Seq: 0, Ack: 1,
Len: 0
No. Time Source Destination Protocol
Length Info Delta
6 09:23:40.666194 204.52.24.116 104.18.2.35 TCP
58 57394 ? 443 [ACK] Seq=1 Ack=1 Win=45056 Len=0 0.000099
Frame 6: 58 bytes on wire (464 bits), 58 bytes captured (464 bits)
Ethernet II, Src: 4e:42:14:a1:2a:fb (4e:42:14:a1:2a:fb), Dst: IETF-VRRP-VRID_ff
(00:00:5e:00:01:ff)
802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 120
Internet Protocol Version 4, Src: 204.52.24.116, Dst: 104.18.2.35
Transmission Control Protocol, Src Port: 57394, Dst Port: 443, Seq: 1, Ack: 1,
Len: 0
No. Time Source Destination Protocol
Length Info Delta
8 09:23:55.673177 104.18.2.35 204.52.24.116 TCP
60 443 ? 57394 [FIN, ACK] Seq=1 Ack=1 Win=65536 Len=0 12.696825
Frame 8: 60 bytes on wire (480 bits), 60 bytes captured (480 bits)
Ethernet II, Src: Mellanox_4a:c0:fd (9c:05:91:4a:c0:fd), Dst: 4e:42:14:a1:2a:fb
(4e:42:14:a1:2a:fb)
802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 120
Internet Protocol Version 4, Src: 104.18.2.35, Dst: 204.52.24.116
Transmission Control Protocol, Src Port: 443, Dst Port: 57394, Seq: 1, Ack: 1,
Len: 0
No. Time Source Destination Protocol
Length Info Delta
9 09:23:55.676533 204.52.24.116 104.18.2.35 TLSv1
65 [TCP Previous segment not captured] , Alert (Level: Fatal, Description:
Decode Error) 0.003356
Frame 9: 65 bytes on wire (520 bits), 65 bytes captured (520 bits)
Ethernet II, Src: 4e:42:14:a1:2a:fb (4e:42:14:a1:2a:fb), Dst: IETF-VRRP-VRID_ff
(00:00:5e:00:01:ff)
802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 120
Internet Protocol Version 4, Src: 204.52.24.116, Dst: 104.18.2.35
Transmission Control Protocol, Src Port: 57394, Dst Port: 443, Seq: 438, Ack:
2, Len: 7
Transport Layer Security
TLSv1 Record Layer: Alert (Level: Fatal, Description: Decode Error)
Content Type: Alert (21)
Version: TLS 1.0 (0x0301)
Length: 2
Alert Message
Level: Fatal (2)
Description: Decode Error (50)
No. Time Source Destination Protocol
Length Info Delta
10 09:23:55.681947 104.18.2.35 204.52.24.116 TCP
56 443 ? 57394 [RST] Seq=2 Win=0 Len=0 0.005414
Frame 10: 56 bytes on wire (448 bits), 56 bytes captured (448 bits)
Ethernet II, Src: Mellanox_4a:c0:fd (9c:05:91:4a:c0:fd), Dst: 4e:42:14:a1:2a:fb
(4e:42:14:a1:2a:fb)
Internet Protocol Version 4, Src: 104.18.2.35, Dst: 204.52.24.116
Transmission Control Protocol, Src Port: 443, Dst Port: 57394, Seq: 2, Len: 0
No. Time Source Destination Protocol
Length Info Delta
14 09:24:08.064432 172.27.18.244 104.18.2.35 TLSv1
502 Client Hello, Alert (Level: Fatal, Description: Decode Error) 2.362983
Frame 14: 502 bytes on wire (4016 bits), 502 bytes captured (4016 bits)
Ethernet II, Src: 4e:42:14:a1:2a:fb (4e:42:14:a1:2a:fb), Dst: IETF-VRRP-VRID_ff
(00:00:5e:00:01:ff)
802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 120
Internet Protocol Version 4, Src: 172.27.18.244, Dst: 104.18.2.35
Transmission Control Protocol, Src Port: 57394, Dst Port: 443, Seq: 1, Ack: 1,
Len: 444
Transport Layer Security
TLSv1 Record Layer: Handshake Protocol: Client Hello
Content Type: Handshake (22)
Version: TLS 1.0 (0x0301)
Length: 432
Handshake Protocol: Client Hello
TLSv1 Record Layer: Alert (Level: Fatal, Description: Decode Error)
Content Type: Alert (21)
Version: TLS 1.0 (0x0301)
Length: 2
Alert Message
Level: Fatal (2)
Description: Decode Error (50)
```
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bugzilla-daemon at netfilter.org
2024-Jun-04 19:01 UTC
[Bug 1747] Connection Tracking - TC_DROP in SK_BUFF
https://bugzilla.netfilter.org/show_bug.cgi?id=1747
Pablo Neira Ayuso <pablo at netfilter.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |pablo at netfilter.org
Resolution|--- |DUPLICATE
--- Comment #1 from Pablo Neira Ayuso <pablo at netfilter.org> ---
*** This bug has been marked as a duplicate of bug 1746 ***
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