v0.6.3

• Add libxdp support via dlopen(3)
• Add --max-window flag for disabling variable window mechanism (mainly for debugging purposes)
• Add --xdp-mode={skb,native} option for forcing XDP attach mode
  • Some VMs may encounter errors when loading Mimic, similar to that of #11. Use --xdp-mode=skb to work around them.
  • Some Intel NICs have XDP native mode for offloading XDP programs in drivers (e1000e, igb, igc, etc.), but may sometimes experience sudden connection breaks that last for minutes. --xdp-mode=skb may help by disabling offload.
• Allow IP free bind to enable scenarios like #7.
• Various bug fixes

v0.6.2

This is a minor release with Debian packaging fixes, in line with Debian upstream packaging effort.

Major changes in v0.6.0 include:

• Do not depend on bpf_xdp_get_buff_len for payload length; this could be larger than the actual packet length, and the real length should be retrieved from packet headers
• Add kprobe checksum hacks, along with previous kfunc implementation
• Enable XDP fragments support
• RST is now sent to peers when Mimic is shutting down
• Allow domain names in filters; they are only resolved when Mimic starts, and only resolved IPs are stored
• Allow fixed or pseudo-random padding in packets

v0.6.1

This is a minor release with Debian packaging fixes, in line with Debian upstream packaging effort.

Major changes in v0.6.0 include:

• Do not depend on bpf_xdp_get_buff_len for payload length; this could be larger than the actual packet length, and the real length should be retrieved from packet headers
• Add kprobe checksum hacks, along with previous kfunc implementation
• Enable XDP fragments support
• RST is now sent to peers when Mimic is shutting down
• Allow domain names in filters; they are only resolved when Mimic starts, and only resolved IPs are stored
• Allow fixed or pseudo-random padding in packets

v0.6.0

This version supports alternative kprobe method for checksum hacks, domain resolution support, packet padding and more!

• Do not depend on bpf_xdp_get_buff_len for payload length; this could be larger than the actual packet length, and the real length should be retrieved from packet headers
• Add kprobe checksum hacks, along with previous kfunc implementation
• Enable XDP fragments support
• RST is now sent to peers when Mimic is shutting down
• Allow domain names in filters; they are only resolved when Mimic starts, and only resolved IPs are stored
• Allow fixed or pseudo-random padding in packets

Full Changelog: v0.5.0...v0.6.0

v0.5.0

This version consists mostly of new test environments, major fixes and internal changes. Some notable are:

• Track TCP window size and send window change packets to prevent conntrack failure
• (distro packages) Tries to extract vmlinux from boot image if vmlinux is not available in module build directory
• Add passive mode, i.e. "do not initiate handshake", enabled by setting handshake interval to 0

Full Changelog: v0.4.2...v0.5.0

v0.4.2

• Fix systemd service file, adding missing [Install] section
• Fix version display in Mimic CLI

Changes in v0.4.x include:

• Variable congestion window to better mimic real TCP
• Notify supervisor when Mimic is ready (currently only systemd)
• Drop json-c dependency, lock file now uses key=value pair
• Add handshake and keepalive mechanism, as well as its settings, both global and filter-specific
• Add mimic(1) manpage
• Better logging UX, including full TCP traffic trace

v0.4.1

• Fix configuration file parsing
• Make trace output more visible on certain terminals

Changes in v0.4.x include:

• Variable congestion window to better mimic real TCP
• Notify supervisor when Mimic is ready (currently only systemd)
• Drop json-c dependency, lock file now uses key=value pair
• Add handshake and keepalive mechanism, as well as its settings, both global and filter-specific
• Add mimic(1) manpage
• Better logging UX, including full TCP traffic trace

v0.4.0

• Variable congestion window to better mimic real TCP
• Notify supervisor when Mimic is ready (currently only systemd)
• Drop json-c dependency, lock file now uses key=value pair
• Add handshake and keepalive mechanism, as well as its settings, both global and filter-specific
• Add mimic(1) manpage
• Better logging UX, including full TCP traffic trace

v0.3.1

• Ubuntu: prebuilt distribution switched from 23.10 (mantic) to 24.04 LTS (noble)
• Add null checks in pktbuf.c to prevent edge-case segfaults
• Reduce error message on failing to send buffered packets
• Fix compiler warnings

v0.3.0

This is a major release of Mimic! Changes include:

• Proper TCP handshake by actively sending packets using raw socket (see README#Caveats for more information)
• Only calculate checksum deltas on ingress path
• Correctly build and install DKMS kernel modules on Debian and Ubuntu