net_sched: Remove broken tc actions

While auditing the code to make certain it would be safe to enable the user namespace root to use tc actions I stumbled on the strange fact that two of the tc modules in the kernel have been broken for more years than I care to think about.

In particular neither of these two modules implements the tc_action_ops lookup method. Which means that in practice neither RTM_GETACTION nor RTM_DELACTION work. And with RTM_DELACTION broken that looks like a permanent leak of kernel memory to me.

A leak I am not happy at root having and certainly not something I want to allow unprivileged users access to.

On the premise that 5+ years is too long to wait for someone to notice, complain and get this code fixed let's just remove these broken tc modules.

Eric W. Biederman (2):
net_sched: Remove broken act_skbedit
net_sched: Remove broken act_simple

 include/net/tc_act/tc_defact.h         |   14 --
 include/net/tc_act/tc_skbedit.h        |   36 -----
 include/uapi/linux/tc_act/Kbuild       |    2 -
 include/uapi/linux/tc_act/tc_defact.h  |   19 ---
 include/uapi/linux/tc_act/tc_skbedit.h |   46 -------
 net/sched/Kconfig                      |   25 ----
 net/sched/Makefile                     |    2 -
 net/sched/act_simple.c                 |  225 --------------------------------
 net/sched/act_skbedit.c                |  224 -------------------------------
 9 files changed, 0 insertions(+), 593 deletions(-)