net/sched: Retire tcindex classifier

jira VULN-7630
cve CVE-2023-1829
commit-author Jamal Hadi Salim <[email protected]>
commit 8c710f7
upstream-diff Changes not in `ciqcbr7_9':
    1. No changes to `include/net/tc_wrapper.h' as this file was introduced
       much later, in v6.2, and has no predecessor in `ciqcbr7_9'.
    2. No changes to
       `tools/testing/selftests/tc-testing/tc-tests/filters/tcindex.json' as
       this file is part of `tc' testing which `ciqcbr7_9' lacks entirely.
    Changes not in the upstream:
    1. Removal of `CONFIG_NET_CLS_TCINDEX' options from the files in
       `configs/*' - the upstream doesn't keep config files under version
       control unlike Rocky.

The tcindex classifier has served us well for about a quarter of a century
but has not been getting much TLC due to lack of known users. Most recently
it has become easy prey to syzkaller. For this reason, we are retiring it.

	Signed-off-by: Jamal Hadi Salim <[email protected]>
	Acked-by: Jiri Pirko <[email protected]>
	Signed-off-by: Paolo Abeni <[email protected]>
(cherry picked from commit 8c710f7)
	Signed-off-by: Marcin Wcisło <[email protected]>

Author: pvts-mat

configs/kernel-3.10.0-x86_64-debug.config

@@ -1353,7 +1353,6 @@ CONFIG_NET_SCH_PLUG=m
 #
 CONFIG_NET_CLS=y
 CONFIG_NET_CLS_BASIC=m
-CONFIG_NET_CLS_TCINDEX=m
 CONFIG_NET_CLS_ROUTE4=m
 CONFIG_NET_CLS_FW=m
 CONFIG_NET_CLS_U32=m

configs/kernel-3.10.0-x86_64.config

@@ -1357,7 +1357,6 @@ CONFIG_NET_SCH_PLUG=m
 #
 CONFIG_NET_CLS=y
 CONFIG_NET_CLS_BASIC=m
-CONFIG_NET_CLS_TCINDEX=m
 CONFIG_NET_CLS_ROUTE4=m
 CONFIG_NET_CLS_FW=m
 CONFIG_NET_CLS_U32=m

net/sched/Kconfig

@@ -423,17 +423,6 @@ config NET_CLS_BASIC
 	  To compile this code as a module, choose M here: the
 	  module will be called cls_basic.
 
-config NET_CLS_TCINDEX
-	tristate "Traffic-Control Index (TCINDEX)"
-	select NET_CLS
-	---help---
-	  Say Y here if you want to be able to classify packets based on
-	  traffic control indices. You will want this feature if you want
-	  to implement Differentiated Services together with DSMARK.
-
-	  To compile this code as a module, choose M here: the
-	  module will be called cls_tcindex.
-
 config NET_CLS_ROUTE4
 	tristate "Routing decision (ROUTE)"
 	depends on INET

net/sched/Makefile

@@ -57,7 +57,6 @@ obj-$(CONFIG_NET_CLS_U32)	+= cls_u32.o
 obj-$(CONFIG_NET_CLS_ROUTE4)	+= cls_route.o
 obj-$(CONFIG_NET_CLS_FW)	+= cls_fw.o
 obj-$(CONFIG_NET_CLS_RSVP)	+= cls_rsvp.o
-obj-$(CONFIG_NET_CLS_TCINDEX)	+= cls_tcindex.o
 obj-$(CONFIG_NET_CLS_RSVP6)	+= cls_rsvp6.o
 obj-$(CONFIG_NET_CLS_BASIC)	+= cls_basic.o
 obj-$(CONFIG_NET_CLS_FLOW)	+= cls_flow.o