Suricata

FLOW_DIR_REVERSED may be set if a midstream flow is picked up.
However at least in the following cases, the flag is not being handled (there may be more cases).

Do we actually need this flag? i.e. is it too expensive to flip the actual values?
It seems expensive to maintain this odd case using a flag.

stream-tcp.c:StreamTcpPseudoPacketCreateDetectLogFlush

util-lua-common.c:LuaCallbackTuplePushToStackFromFlow

Steps to reproduce:¶

1. create a test lua script that implements the match callback and print out the SCFlowTuple returns
2. create a rule like

   reject ip $HOME_NET any -> any any (msg:"Blocked"; flow:to_server,not_established; luajit:test.lua; classtype:block; sid:1; rev:1;)

3. set stream.midstream=true in config
4. replay the a tcp stream pcap with the first SYN packet removed

We should expect the lua script print the correct source and destination.

Build info:¶

This is Suricata version 6.0.4 RELEASE
Features: DEBUG UNITTESTS NFQ PCAP_SET_BUFF AF_PACKET HAVE_PACKET_FANOUT LIBCAP_NG LIBNET1.1 HAVE_HTP_URI_NORMALIZE_HOOK PCRE_JIT HAVE_NSS HAVE_LUA HAVE_LUAJIT HAVE_LIBJANSSON TLS TLS_C11 MAGIC RUST 
SIMD support: SSE_4_2 SSE_4_1 SSE_3 
Atomic intrinsics: 1 2 4 8 16 byte(s)
64-bits, Little-endian architecture
GCC version 10.2.1 20210110, C version 201112
compiled with -fstack-protector
compiled with _FORTIFY_SOURCE=2
L1 cache line size (CLS)=64
thread local storage method: _Thread_local
compiled with LibHTP v0.5.39, linked against LibHTP v0.5.39

Suricata Configuration:
  AF_PACKET support:                       yes
  eBPF support:                            yes
  XDP support:                             yes
  PF_RING support:                         no
  NFQueue support:                         yes
  NFLOG support:                           yes
  IPFW support:                            no
  Netmap support:                          no 
  DAG enabled:                             no
  Napatech enabled:                        no
  WinDivert enabled:                       no

  Unix socket enabled:                     yes
  Detection enabled:                       yes

  Libmagic support:                        yes
  libnss support:                          yes
  libnspr support:                         yes
  libjansson support:                      yes
  hiredis support:                         no
  hiredis async with libevent:             no
  Prelude support:                         no
  PCRE jit:                                yes
  LUA support:                             yes, through luajit
  libluajit:                               yes
  GeoIP2 support:                          yes
  Non-bundled htp:                         no
  Hyperscan support:                       yes
  Libnet support:                          yes
  liblz4 support:                          yes
  HTTP2 decompression:                     no

  Rust support:                            yes
  Rust strict mode:                        no
  Rust compiler path:                      /root/.cargo/bin/rustc
  Rust compiler version:                   rustc 1.55.0 (c8dfcfe04 2021-09-06)
  Cargo path:                              /root/.cargo/bin/cargo
  Cargo version:                           cargo 1.55.0 (32da73ab1 2021-08-23)
  Cargo vendor:                            yes

  Python support:                          yes
  Python path:                             /usr/bin/python3
  Python distutils                         yes
  Python yaml                              yes
  Install suricatactl:                     yes
  Install suricatasc:                      yes
  Install suricata-update:                 not bundled

  Profiling enabled:                       no
  Profiling locks enabled:                 no

  Plugin support (experimental):           yes

Development settings:
  Coccinelle / spatch:                     no
  Unit tests enabled:                      yes
  Debug output enabled:                    yes
  Debug validation enabled:                no

Generic build parameters:
  Installation prefix:                     /suricata/install
  Configuration directory:                 /etc/suricata/
  Log directory:                           /var/log/suricata/

  --prefix                                 /suricata/install
  --sysconfdir                             /etc
  --localstatedir                          /var
  --datarootdir                            /suricata/install/share

  Host:                                    x86_64-pc-linux-gnu
  Compiler:                                gcc (exec name) / g++ (real)
  GCC Protect enabled:                     yes
  GCC march native enabled:                no
  GCC Profile enabled:                     no
  Position Independent Executable enabled: no
  CFLAGS                                   -DUNITTESTS -march=broadwell -O0 -std=c11 -I${srcdir}/../rust/gen -I${srcdir}/../rust/dist
  PCAP_CFLAGS                               -I/usr/include
  SECCFLAGS                                -fstack-protector -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security