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path: root/src/plugins/nat/nat44-ed/nat44_ed_format.c
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2022-04-21nat: tweak rfc7857 tcp connection trackingOle Troan1-26/+3
The RFC7857 state machine introduced in 56c492a is a trade-off. It tries to retain sessions as much as possible and also offers some protection against spurious RST by re-establishing sessions if data is received after the RST. From experience in the wild, this algorithm is a little too liberal, as it leaves too many spurious established sessions in the session table. E.g. a oberserved pattern is: client server <- FIN, ACK ACK -> ACK -> RST, ACK -> With the current state machine this would leave the session in established state. These proposed changes do: - require 3-way handshake to establish session. (current requires only to see SYNs from both sides) - RST will move session to transitory without recovery if data is sent after - Only a single FIN is needed to move to transitory Fixes: 56c492aa0502751de2dd9d890096a82c5f04776d Type: fix Signed-off-by: Ole Troan <ot@cisco.com> Change-Id: I92e593e00b2efe48d04997642d85bd59e0eaa2ea Signed-off-by: Ole Troan <ot@cisco.com>
2022-04-01nat: nat44-ed cleanup & fixesFilip Varga1-17/+164
Set deprecated option on unsupported API calls. Cleaned up API calls with deprecated option. Removed in progress option from long term used API calls. Removed obsolete/unused nodes, functions, variables. Fixed set frame queue nelts function. Calling API would incorrectly not fail even though frame queue nelts can only be set before first call nat44_plugin_enable. Moved all formatting functions to _format.c file. Type: refactor Change-Id: I3ca16e0568f8d7eee3a27c3620ca36164833a7e4 Signed-off-by: Filip Varga <fivarga@cisco.com>
2022-01-24nat: TCP state tracking based on RFC 7857/RFC 6146Klement Sekera1-20/+6
Implement proper state machine based on above RFCs. ACKs to SYNs/FINs are no longer required/tracked. This is more friendly to peers and accounts for lost packets and retransmits. This change also means that all traffic is translated and forwarded while in transitory timeout, which helps delivering e.g. retransmitted FINs, FINACKs and other messages. Also support reopening a session in transitory timeout after seeing both FINs by seeing both SYNs again. This helps quick connection reestablishment if the peers want to. Type: improvement Signed-off-by: Klement Sekera <ksekera@cisco.com> Signed-off-by: Miklos Tirpak <miklos.tirpak@gmail.com> Change-Id: Ibf521c79463472db97e593bfa02b32b4a06dfd2a
2022-01-04nat: remove nat44-ed relation between SM and addrFilip Varga1-1/+2
Change [1] put static mappings in flow hash. This change also broke relationship between nat pool addresses and static mappings. Port and address are no longer reserved in nat pool address records for a new static mapping. Because of this change both nat objects and their configuration can function independently. This change also removed already broken logic of having static-mapping-only configuration. In this patch i have cleaned up and removed unnecessary logic for static mapping configuration functions, address configuration functions, interface configuraiton functions and all callback functions used for resolving interface address bound records. No more viable configuration option static-mapping-only is also removed because there is no more option to run traffic through vpp for static mappings without having flow hash table allocated. Instead user is now able to create static mapping records without using nat pool addresses. Fixed and improved management of required fib entries (ensuring VPP will reply to ARP for all external addresses on outside interfaces) through holding a refcount for their creation and removal. [1] https://gerrit.fd.io/r/c/vpp/+/34077 Type: improvement Change-Id: Ic16deefbede833d574c2a5972155c9afa5bc62ce Signed-off-by: Filip Varga <fivarga@cisco.com>
2021-10-20nat: NAT44-ED api fix and improvementFilip Varga1-1/+1
This patch fixes issue with NAT_API_IS_TWICE_NAT and NAT_API_IS_ADDR_ONLY flags. Because of control plane code change - move from boolean parameters to flags in https://gerrit.fd.io/r/c/vpp/+/32796 patch these api flags weren't correctly set. Type: fix Change-Id: Ieec5fe6bdcca314da027f2d23e3a24f174391a6f Signed-off-by: Filip Varga <fivarga@cisco.com>
2021-10-14nat: static mappings in flow hashKlement Sekera1-70/+15
Put static mappings in flow hash, drop existing hash tables used for static mappings. Drop refcount variables and use hash table as a single point of truth. Allow creating a static mapping conflicting with dynamic mapping, which will take precedence after dynamic mapping is freed, so that the existing flow can finish transferring data. Type: fix Signed-off-by: Klement Sekera <ksekera@cisco.com> Change-Id: Idfde8efabc09971be38921d4b0ca5ccf4e9fe412
2021-10-12Revert "nat: static mappings in flow hash"Ole Troan1-15/+70
This reverts commit 69b7599e4b061a8996205f0304232ede84cb70d4. Type: fix Signed-off-by: Ole Troan <ot@cisco.com> Change-Id: If531b122ae5a9f91c2fe6eaa0da69922a91f16d3
2021-10-12nat: static mappings in flow hashKlement Sekera1-70/+15
Put static mappings in flow hash, drop existing hash tables used for static mappings. Drop refcount variables and use hash table as a single point of truth. Allow creating a static mapping conflicting with dynamic mapping, which will take precedence after dynamic mapping is freed, so that the existing flow can finish transferring data. Type: fix Signed-off-by: Klement Sekera <ksekera@cisco.com> Change-Id: Ieeba691d83a83887d0a0baccd5f3832f66126096
2021-09-02nat: NAT44 ED improvements and fixesFilip Varga1-14/+11
Fixed FIB entry per interface, pool and static mapping registrations in NAT control plane. Improved FIB configuration handling in NAT - added functions to generalize handling of FIB & NAT, cleaned up interface callback functions. Changed "is_" macros to inline functions for easier debugging. Type: improvement Change-Id: I68a17761a975dd819139ae94e52a8a85d3f27ffc Signed-off-by: Filip Varga <fivarga@cisco.com>
2021-07-22nat: nat44-ed configuration refactor & cleanupFilip Varga1-38/+33
Refactoring static mapping configuration functions based on feature type. Type: refactor Signed-off-by: Filip Varga <fivarga@cisco.com> Change-Id: I007d9b0e9717ced613fbcef2b11b6853f479be1e
2021-02-24nat: Final NAT44 EI/ED split patchFilip Varga1-0/+277
This patch achieves complete separation of endpoint-dependent and endpoint-independent IPv4 NAT features. Some common stuff is also moved to NAT library. Type: refactor Change-Id: I52468b7e2b5ac28958a2baf8e2ea01787322e801 Signed-off-by: Filip Varga <fivarga@cisco.com>