Revision a82c25c366b0963d33ddf699196e6cf57f6d89b1 authored by Florian Westphal on 08 March 2022, 12:52:11 UTC, committed by Florian Westphal on 08 March 2022, 12:52:11 UTC
This reverts commit 878aed8db324bec64f3c3f956e64d5ae7375a5de. This change breaks existing setups where conntrack is used with asymmetric paths. In these cases, the NAT transformation occurs on the syn-ack instead of the syn: 1. SYN x:12345 -> y -> 443 // sent by initiator, receiverd by responder 2. SYNACK y:443 -> x:12345 // First packet seen by conntrack, as sent by responder 3. tuple_force_port_remap() gets called, sees: 'tcp from 443 to port 12345 NAT' -> pick a new source port, inititor receives 4. SYNACK y:$RANDOM -> x:12345 // connection is never established While its possible to avoid the breakage with NOTRACK rules, a kernel update should not break working setups. An alternative to the revert is to augment conntrack to tag mid-stream connections plus more code in the nat core to skip NAT for such connections, however, this leads to more interaction/integration between conntrack and NAT. Therefore, revert, users will need to add explicit nat rules to avoid port shadowing. Link: https://lore.kernel.org/netfilter-devel/20220302105908.GA5852@breakpoint.cc/#R Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2051413 Signed-off-by: Florian Westphal <fw@strlen.de>
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amd-memory-encryption.rst | -rw-r--r-- | 4.5 KB |
boot.rst | -rw-r--r-- | 49.9 KB |
booting-dt.rst | -rw-r--r-- | 938 bytes |
buslock.rst | -rw-r--r-- | 4.6 KB |
cpuinfo.rst | -rw-r--r-- | 7.9 KB |
earlyprintk.rst | -rw-r--r-- | 6.2 KB |
elf_auxvec.rst | -rw-r--r-- | 1.4 KB |
entry_64.rst | -rw-r--r-- | 4.2 KB |
exception-tables.rst | -rw-r--r-- | 13.8 KB |
features.rst | -rw-r--r-- | 90 bytes |
index.rst | -rw-r--r-- | 546 bytes |
intel-iommu.rst | -rw-r--r-- | 3.9 KB |
intel_txt.rst | -rw-r--r-- | 10.3 KB |
kernel-stacks.rst | -rw-r--r-- | 6.5 KB |
mds.rst | -rw-r--r-- | 8.5 KB |
microcode.rst | -rw-r--r-- | 4.0 KB |
mtrr.rst | -rw-r--r-- | 11.6 KB |
orc-unwinder.rst | -rw-r--r-- | 8.0 KB |
pat.rst | -rw-r--r-- | 11.5 KB |
pti.rst | -rw-r--r-- | 8.9 KB |
resctrl.rst | -rw-r--r-- | 46.9 KB |
sgx.rst | -rw-r--r-- | 12.2 KB |
sva.rst | -rw-r--r-- | 11.9 KB |
tlb.rst | -rw-r--r-- | 3.6 KB |
topology.rst | -rw-r--r-- | 7.2 KB |
tsx_async_abort.rst | -rw-r--r-- | 6.8 KB |
usb-legacy-support.rst | -rw-r--r-- | 1.8 KB |
xstate.rst | -rw-r--r-- | 3.2 KB |
zero-page.rst | -rw-r--r-- | 2.1 KB |
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