#!/bin/sh

case $BOXCONF_OS_VERSION in
  13.*)
    set_sysctl \
      net.inet.ip.check_interface=1 \
      net.inet.tcp.rfc6675_pipe=1
    ;;
  *)
    set_sysctl \
      net.inet.ip.rfc1122_strong_es=1
    ;;
esac

load_kernel_module cc_htcp

set_sysctl \
  net.inet.icmp.drop_redirect=1 \
  net.inet.ip.process_options=0 \
  net.inet.ip.random_id=1 \
  net.inet.ip.redirect=0 \
  net.inet.tcp.abc_l_var=44 \
  net.inet.tcp.always_keepalive=0 \
  net.inet.tcp.cc.abe=1 \
  net.inet.tcp.cc.algorithm=htcp \
  net.inet.tcp.cc.htcp.adaptive_backoff=1 \
  net.inet.tcp.cc.htcp.rtt_scaling=1 \
  net.inet.tcp.drop_synfin=1 \
  net.inet.tcp.ecn.enable=1 \
  net.inet.tcp.fastopen.server_enable=1 \
  net.inet.tcp.icmp_may_rst=0 \
  net.inet.tcp.initcwnd_segments=44 \
  net.inet.tcp.minmss=536 \
  net.inet.tcp.msl=2500 \
  net.inet.tcp.mssdflt=1448 \
  net.inet.tcp.nolocaltimewait=1 \
  net.inet.tcp.path_mtu_discovery=0 \
  net.inet.tcp.recvbuf_max="$tcp_buffer_size" \
  net.inet.tcp.recvspace=65536 \
  net.inet.tcp.sendbuf_inc=65536 \
  net.inet.tcp.sendbuf_max="$tcp_buffer_size" \
  net.inet.tcp.sendspace=65536 \
  net.inet.tcp.syncookies=0 \
  net.inet6.ip6.redirect=0 \
  security.bsd.unprivileged_proc_debug="$allow_proc_debug"

# Some sysctls cannot be set within jails.
if [ "$BOXCONF_VIRTUALIZATION_TYPE" != jail ]; then
  set_sysctl \
    hw.kbd.keymap_restrict_change=4 \
    kern.coredump=0 \
    kern.elf32.allow_wx="$allow_wx" \
    kern.elf32.aslr.pie_enable=1 \
    kern.elf64.allow_wx="$allow_wx" \
    kern.ipc.maxsockbuf="$tcp_buffer_size" \
    kern.ipc.shm_use_phys=1 \
    kern.ipc.soacceptqueue=1024 \
    kern.ipc.somaxconn=1024 \
    kern.random.fortuna.minpoolsize=128 \
    kern.randompid=1 \
    net.inet.tcp.fast_finwait2_recycle=1 \
    net.inet.tcp.finwait2_timeout=5000 \
    net.inet.tcp.keepcnt=2 \
    net.inet.tcp.keepidle=62000 \
    net.inet.tcp.keepinit=5000 \
    net.inet.tcp.minmss=536 \
    net.inet.tcp.minmss=536 \
    security.bsd.hardlink_check_gid=0 \
    security.bsd.hardlink_check_uid=0 \
    security.bsd.see_other_gids=0 \
    security.bsd.see_other_uids=0 \
    security.bsd.unprivileged_read_msgbuf=0 \
    vfs.zfs.min_auto_ashift=12

  # FreeBSD automatically scales kern.maxfilesperproc with the amount of memory.
  # On systems with large amounts of RAM, this can cause strange lags with some 
  # applications that attempt to close every possible file descriptor.
  # Therefore, we arbitrarily cap this value at 65535.
  [ "$(sysctl -n kern.maxfilesperproc)" -le 65535 ] || set_sysctl kern.maxfilesperproc=65535
fi