From 8bd4b4f79b5de483353a8c0d0962e71934b7bdd2 Mon Sep 17 00:00:00 2001
From: Phil Sutter <phil@nwl.cc>
Date: Fri, 30 Oct 2020 12:42:57 +0100
Subject: xshared: Merge some command option-related code

Add OPT_FRAGMENT define into the enum of other OPT_* defines at the
right position and adjust the arptables-specific ones that follow
accordingly. Appropriately adjust inverse_for_options array in
xtables-arp.c.

Extend optflags from iptables.c by the arptables values for the sake of
completeness, then move it to xshared.h along with NUMBER_OF_OPT
definition. As a side-effect, this fixes for wrong ordering of entries
in arptables' 'optflags' copy.

Add arptables-specific bits to commands_v_options table (the speicific
options are matches on ARP header fields, just treat them like '-s'
option. This is also just a cosmetic change, arptables doesn't have a
generic_opt_check() implementation and hence doesn't use such a table.

With things potentially ready for common use, move commands_v_options
table along with generic_opt_check() and opt2char() into xshared.c and
drop the local (identical) implementations from iptables.c, ip6tables.c
xtables.c and xtables-arp.c. While doing so, fix ordering of entries in
that table: the row for CMD_ZERO_NUM was in the wrong position. Since
all moved rows though are identical, this had no effect in practice.

Fixes: d960a991350ca ("xtables-arp: Integrate OPT_* defines into xshared.h")
Fixes: 384958620abab ("use nf_tables and nf_tables compatibility interface")
Signed-off-by: Phil Sutter <phil@nwl.cc>
---
 iptables/ip6tables.c | 79 ----------------------------------------------------
 1 file changed, 79 deletions(-)

(limited to 'iptables/ip6tables.c')

diff --git a/iptables/ip6tables.c b/iptables/ip6tables.c
index 576c2cf8..c95355b0 100644
--- a/iptables/ip6tables.c
+++ b/iptables/ip6tables.c
@@ -45,10 +45,6 @@
 #include "ip6tables-multi.h"
 #include "xshared.h"
 
-#define NUMBER_OF_OPT	ARRAY_SIZE(optflags)
-static const char optflags[]
-= { 'n', 's', 'd', 'p', 'j', 'v', 'x', 'i', 'o', '0', 'c'};
-
 static const char unsupported_rev[] = " [unsupported revision]";
 
 static struct option original_opts[] = {
@@ -100,36 +96,6 @@ struct xtables_globals ip6tables_globals = {
 	.compat_rev = xtables_compatible_revision,
 };
 
-/* Table of legal combinations of commands and options.  If any of the
- * given commands make an option legal, that option is legal (applies to
- * CMD_LIST and CMD_ZERO only).
- * Key:
- *  +  compulsory
- *  x  illegal
- *     optional
- */
-
-static const char commands_v_options[NUMBER_OF_CMD][NUMBER_OF_OPT] =
-/* Well, it's better than "Re: Linux vs FreeBSD" */
-{
-	/*     -n  -s  -d  -p  -j  -v  -x  -i  -o --line -c */
-/*INSERT*/    {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' '},
-/*DELETE*/    {'x',' ',' ',' ',' ',' ','x',' ',' ','x','x'},
-/*DELETE_NUM*/{'x','x','x','x','x',' ','x','x','x','x','x'},
-/*REPLACE*/   {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' '},
-/*APPEND*/    {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' '},
-/*LIST*/      {' ','x','x','x','x',' ',' ','x','x',' ','x'},
-/*FLUSH*/     {'x','x','x','x','x',' ','x','x','x','x','x'},
-/*ZERO*/      {'x','x','x','x','x',' ','x','x','x','x','x'},
-/*NEW_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'},
-/*DEL_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'},
-/*SET_POLICY*/{'x','x','x','x','x',' ','x','x','x','x',' '},
-/*RENAME*/    {'x','x','x','x','x',' ','x','x','x','x','x'},
-/*LIST_RULES*/{'x','x','x','x','x',' ','x','x','x','x','x'},
-/*ZERO_NUM*/  {'x','x','x','x','x',' ','x','x','x','x','x'},
-/*CHECK*/     {'x',' ',' ',' ',' ',' ','x',' ',' ','x','x'},
-};
-
 static const unsigned int inverse_for_options[NUMBER_OF_OPT] =
 {
 /* -n */ 0,
@@ -264,51 +230,6 @@ ip6tables_exit_error(enum xtables_exittype status, const char *msg, ...)
 	exit(status);
 }
 
-static void
-generic_opt_check(int command, int options)
-{
-	int i, j, legal = 0;
-
-	/* Check that commands are valid with options.  Complicated by the
-	 * fact that if an option is legal with *any* command given, it is
-	 * legal overall (ie. -z and -l).
-	 */
-	for (i = 0; i < NUMBER_OF_OPT; i++) {
-		legal = 0; /* -1 => illegal, 1 => legal, 0 => undecided. */
-
-		for (j = 0; j < NUMBER_OF_CMD; j++) {
-			if (!(command & (1<<j)))
-				continue;
-
-			if (!(options & (1<<i))) {
-				if (commands_v_options[j][i] == '+')
-					xtables_error(PARAMETER_PROBLEM,
-						   "You need to supply the `-%c' "
-						   "option for this command\n",
-						   optflags[i]);
-			} else {
-				if (commands_v_options[j][i] != 'x')
-					legal = 1;
-				else if (legal == 0)
-					legal = -1;
-			}
-		}
-		if (legal == -1)
-			xtables_error(PARAMETER_PROBLEM,
-				   "Illegal option `-%c' with this command\n",
-				   optflags[i]);
-	}
-}
-
-static char
-opt2char(int option)
-{
-	const char *ptr;
-	for (ptr = optflags; option > 1; option >>= 1, ptr++);
-
-	return *ptr;
-}
-
 /*
  *	All functions starting with "parse" should succeed, otherwise
  *	the program fails.
-- 
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