easterhegg-2005-website/noc/patches/usagi-iptables-s20050314.diff

diff -urN iptables-1.2.11/extensions/.state-test6 iptables/extensions/.state-test6
--- iptables-1.2.11/extensions/.state-test6	1970-01-01 01:00:00.000000000 +0100
+++ iptables/extensions/.state-test6	2003-11-28 04:14:10.000000000 +0100
@@ -0,0 +1,2 @@
+#!/bin/sh
+[ -f $KERNEL_DIR/net/ipv6/netfilter/ip6t_state.c -a -f $KERNEL_DIR/include/linux/netfilter_ipv6/ip6t_state.h ] && echo state
diff -urN iptables-1.2.11/extensions/libip6t_state.c iptables/extensions/libip6t_state.c
--- iptables-1.2.11/extensions/libip6t_state.c	1970-01-01 01:00:00.000000000 +0100
+++ iptables/extensions/libip6t_state.c	2003-11-28 04:14:10.000000000 +0100
@@ -0,0 +1,163 @@
+/* Shared library add-on to ip6tables to add state tracking support. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <ip6tables.h>
+#include <linux/netfilter_ipv6/ip6_conntrack.h>
+#include <linux/netfilter_ipv6/ip6t_state.h>
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+	printf(
+"state v%s options:\n"
+" [!] --state [INVALID|ESTABLISHED|NEW|RELATED][,...]\n"
+"				State(s) to match\n"
+"\n", IPTABLES_VERSION);
+}
+
+static struct option opts[] = {
+	{ "state", 1, 0, '1' },
+	{0}
+};
+
+/* Initialize the match. */
+static void
+init(struct ip6t_entry_match *m, unsigned int *nfcache)
+{
+	/* Can't cache this */
+	*nfcache |= NFC_UNKNOWN;
+}
+
+static int
+parse_state(const char *state, size_t strlen, struct ip6t_state_info *sinfo)
+{
+	if (strncasecmp(state, "INVALID", strlen) == 0)
+		sinfo->statemask |= IP6T_STATE_INVALID;
+	else if (strncasecmp(state, "NEW", strlen) == 0)
+		sinfo->statemask |= IP6T_STATE_BIT(IP6_CT_NEW);
+	else if (strncasecmp(state, "ESTABLISHED", strlen) == 0)
+		sinfo->statemask |= IP6T_STATE_BIT(IP6_CT_ESTABLISHED);
+	else if (strncasecmp(state, "RELATED", strlen) == 0)
+		sinfo->statemask |= IP6T_STATE_BIT(IP6_CT_RELATED);
+	else
+		return 0;
+	return 1;
+}
+
+static void
+parse_states(const char *arg, struct ip6t_state_info *sinfo)
+{
+	const char *comma;
+
+	while ((comma = strchr(arg, ',')) != NULL) {
+		if (comma == arg || !parse_state(arg, comma-arg, sinfo))
+			exit_error(PARAMETER_PROBLEM, "Bad state `%s'", arg);
+		arg = comma+1;
+	}
+
+	if (strlen(arg) == 0 || !parse_state(arg, strlen(arg), sinfo))
+		exit_error(PARAMETER_PROBLEM, "Bad state `%s'", arg);
+}
+
+/* Function which parses command options; returns true if it
+   ate an option */
+static int
+parse(int c, char **argv, int invert, unsigned int *flags,
+      const struct ip6t_entry *entry,
+      unsigned int *nfcache,
+      struct ip6t_entry_match **match)
+{
+	struct ip6t_state_info *sinfo = (struct ip6t_state_info *)(*match)->data;
+
+	switch (c) {
+	case '1':
+		check_inverse(optarg, &invert, &optind, 0);
+
+		parse_states(argv[optind-1], sinfo);
+		if (invert)
+			sinfo->statemask = ~sinfo->statemask;
+		*flags = 1;
+		break;
+
+	default:
+		return 0;
+	}
+
+	return 1;
+}
+
+/* Final check; must have specified --state. */
+static void final_check(unsigned int flags)
+{
+	if (!flags)
+		exit_error(PARAMETER_PROBLEM, "You must specify `--state'");
+}
+
+static void print_state(unsigned int statemask)
+{
+	const char *sep = "";
+
+	if (statemask & IP6T_STATE_INVALID) {
+		printf("%sINVALID", sep);
+		sep = ",";
+	}
+	if (statemask & IP6T_STATE_BIT(IP6_CT_NEW)) {
+		printf("%sNEW", sep);
+		sep = ",";
+	}
+	if (statemask & IP6T_STATE_BIT(IP6_CT_RELATED)) {
+		printf("%sRELATED", sep);
+		sep = ",";
+	}
+	if (statemask & IP6T_STATE_BIT(IP6_CT_ESTABLISHED)) {
+		printf("%sESTABLISHED", sep);
+		sep = ",";
+	}
+	printf(" ");
+}
+
+/* Prints out the matchinfo. */
+static void
+print(const struct ip6t_ip6 *ip,
+      const struct ip6t_entry_match *match,
+      int numeric)
+{
+	struct ip6t_state_info *sinfo = (struct ip6t_state_info *)match->data;
+
+	printf("state ");
+	print_state(sinfo->statemask);
+}
+
+/* Saves the matchinfo in parsable form to stdout. */
+static void save(const struct ip6t_ip6 *ip, const struct ip6t_entry_match *match)
+{
+	struct ip6t_state_info *sinfo = (struct ip6t_state_info *)match->data;
+
+	printf("--state ");
+	print_state(sinfo->statemask);
+}
+
+static
+struct ip6tables_match state
+= { NULL,
+    "state",
+    IPTABLES_VERSION,
+    IP6T_ALIGN(sizeof(struct ip6t_state_info)),
+    IP6T_ALIGN(sizeof(struct ip6t_state_info)),
+    &help,
+    &init,
+    &parse,
+    &final_check,
+    &print,
+    &save,
+    opts
+};
+
+void _init(void)
+{
+	register_match6(&state);
+}