From: Pablo Neira

Hi jamal,

I found some spare time to play around a bit more with you ipt action stuff.

I've tested the patch attached with the testcase here below. It works
fine here. It fixes broken target option checkings (final_check) and a
leak in the merge_options function. I've killed copy_options since I
didn't find any reason why we need it.

--- test.sh ---
tc qdisc del dev wlan0 ingress
tc qdisc add dev wlan0 ingress
tc filter add dev wlan0 parent ffff: protocol ip prio 6 u32 \
match ip src 192.168.0.2/32 flowid 1:16 \
action ipt -j TOS --set-tos Maximize-Reliability
sleep 3
tc -s filter ls dev wlan0 parent ffff:
--- end of test.sh ---

Results:

tablename: mangle hook: NF_IP_PRE_ROUTING
         target: TOS set Maximize-Reliability  index 0
filter protocol ip pref 6 u32
filter protocol ip pref 6 u32 fh 800: ht divisor 1
filter protocol ip pref 6 u32 fh 800::800 order 2048 key ht 800 bkt 0
flowid 1:16
   match c0a80002/ffffffff at 12
         action order 1: tablename: mangle  hook: NF_IP_PRE_ROUTING
         target TOS set Maximize-Reliability
         index 18 ref 1 bind 1 installed 3 sec used 0 sec
         Action statistics:
         Sent 725 bytes 7 pkt (dropped 0, overlimits 0 requeues 0)
         rate 0bit 0pps backlog 0b 0p requeues 0

Now, check if options passed to the target are correct.

# tc filter add dev wlan0 parent ffff: protocol ip prio 6 u32 \
match ip dst 192.168.0.2/32 flowid 1:16 \
action ipt -j TOS --set-tos
                             ^^^
                         missing parameter

ipt: option `--set-tos' requires an argument
tc-ipt v0.1: TOS target: Parameter --set-tos is required
Try `tc-ipt -h' or 'tc-ipt --help' for more information.

btw, how's your schedule ? did you finally get spare time to come to the
netfilter workshop in seville ?

bye,
Pablo

ChangeLog

@@ -1,3 +1,7 @@
+2005-06-23  Jamal Hadi Salim <hadi@znyx.com>
+
+	* Fix for options process with ipt
+
 2005-06-23  Thomas Graf <tgraf@suug.ch>
 	
 	* Add extended matches (nbyte, cmp, u32, meta)
@@ -10,7 +14,7 @@
 	  in batched mode.
 	* Assume stdin if no argument is given to -batch
 
-2005-06-22  Stephen Hemminger  <shemminger@dxpl.pdx.osdl.net>
+2005-06-22  Stephen Hemminger  <shemminger@osdl.org>
 
 	* Update include files to 2.6.12
 	* Add ss support for TCP_CONG

tc/m_ipt.c

@@ -69,6 +69,7 @@ static struct option original_opts[] = {
 };
 
 static struct iptables_target *t_list = NULL;
+static struct option *opts = original_opts;
 static unsigned int global_option_offset = 0;
 #define OPTION_OFFSET 256
 
@@ -169,18 +170,13 @@ int string_to_number(const char *s, unsigned int min, unsigned int max,
 	return result;
 }
 
-static struct option *
+static void free_opts(struct option *opts)
-copy_options(struct option *oldopts)
 {
-	struct option *merge;
+	if (opts != original_opts) {
-	unsigned int num_old;
+		free(opts);
-	for (num_old = 0; oldopts[num_old].name; num_old++) ;
+		opts = original_opts;
-	merge = malloc(sizeof (struct option) * (num_old + 1));
+		global_option_offset = 0;
-	if (NULL == merge)
+	}
-		return NULL;
-	memcpy(merge, oldopts, num_old * sizeof (struct option));
-	memset(merge + num_old, 0, sizeof (struct option));
-	return merge;
 }
 
 static struct option *
@@ -385,7 +381,6 @@ static int parse_ipt(struct action_util *a,int *argc_p,
 	int c;
 	int rargc = *argc_p;
 	char **argv = *argv_p;
-	struct option *opts;
 	int argc = 0, iargc = 0;
 	char k[16];
 	int res = -1;
@@ -409,11 +404,6 @@ static int parse_ipt(struct action_util *a,int *argc_p,
 		return -1;
 	}
 
-	opts = copy_options(original_opts);
-
-	if (NULL == opts)
-		return -1;
-
 	while (1) {
 		c = getopt_long(argc, argv, "j:", opts, NULL);
 		if (c == -1)
@@ -440,23 +430,14 @@ static int parse_ipt(struct action_util *a,int *argc_p,
 		default:
 			memset(&fw, 0, sizeof (fw));
 			if (m) {
-				unsigned int fake_flags = 0;
 				m->parse(c - m->option_offset, argv, 0,
-					 &fake_flags, NULL, &m->t);
+					 &m->tflags, NULL, &m->t);
 			} else {
 				fprintf(stderr," failed to find target %s\n\n", optarg);
 				return -1;
 
 			}
 			ok++;
-
-			/*m->final_check(m->t); -- Is this necessary?
-			** useful when theres depencies
-			** eg ipt_TCPMSS.c has have the TCP match loaded
-			** before this can be used;
-			**  also seems the ECN target needs it 
-			*/
-
 			break;
 
 		}
@@ -466,6 +447,7 @@ static int parse_ipt(struct action_util *a,int *argc_p,
 		if (matches(argv[optind], "index") == 0) {
 			if (get_u32(&index, argv[optind + 1], 10)) {
 				fprintf(stderr, "Illegal \"index\"\n");
+				free_opts(opts);
 				return -1;
 			}
 			iok++;
@@ -479,6 +461,10 @@ static int parse_ipt(struct action_util *a,int *argc_p,
 		return -1;
 	}
 
+	/* check that we passed the correct parameters to the target */
+	if (m)
+		m->final_check(m->tflags);
+
 	{
 		struct tcmsg *t = NLMSG_DATA(n);
 		if (t->tcm_parent != TC_H_ROOT
@@ -519,6 +505,7 @@ static int parse_ipt(struct action_util *a,int *argc_p,
 	*argv_p = argv;
 	
 	optind = 1;
+	free_opts(opts);
 
 	return 0;
 
@@ -529,16 +516,10 @@ print_ipt(struct action_util *au,FILE * f, struct rtattr *arg)
 {
 	struct rtattr *tb[TCA_IPT_MAX + 1];
 	struct ipt_entry_target *t = NULL;
-	struct option *opts;
 
 	if (arg == NULL)
 		return -1;
 
-	opts = copy_options(original_opts);
-
-	if (NULL == opts)
-		return -1;
-
 	parse_rtattr_nested(tb, TCA_IPT_MAX, arg);
 
 	if (tb[TCA_IPT_TABLE] == NULL) {
@@ -601,6 +582,7 @@ print_ipt(struct action_util *au,FILE * f, struct rtattr *arg)
 		fprintf(f, " \n");
 
 	}
+	free_opts(opts);
 
 	return 0;
 }