I'm using ftrace to trace ip_local_out() in kernel 5.4.20. I'm sure ip_local_out() is available to trace: /sys/kernel/debug/tracing # cat available_filter_funct
sendgrid-api-v3
mlton
linkage
statistics
vectorcast
webots
odt
blazor-server-side
angular-openlayers
qshortcut
dxflib
pykka
lib-nfc
php-mssql
htonl
plsql
excel-365
pyke
twine-game-engine
java.util.date
mkannotation
file.readalllines
schema
incompatibility
skrules
icacls
activedirectorymembership
android-cursor
javascriptexecutor
raiserror