Git init

1 files changed, 445 insertions, 0 deletions

diff --git a/extensions/libxt_CONNMARK.c b/extensions/libxt_CONNMARK.c
new file mode 100644
index 0000000..6aba5f3
--- /dev/null
+++ b/extensions/libxt_CONNMARK.c
@@ -0,0 +1,445 @@
+/* Shared library add-on to iptables to add CONNMARK target support.
+ *
+ * (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
+ * by Henrik Nordstrom <hno@marasystems.com>
+ *
+ * Version 1.1
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+#include <xtables.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_CONNMARK.h>
+
+struct xt_connmark_target_info {
+	unsigned long mark;
+	unsigned long mask;
+	u_int8_t mode;
+};
+
+enum {
+	F_MARK    = 1 << 0,
+	F_SR_MARK = 1 << 1,
+};
+
+static void CONNMARK_help(void)
+{
+	printf(
+"CONNMARK target options:\n"
+"  --set-mark value[/mask]       Set conntrack mark value\n"
+"  --save-mark [--mask mask]     Save the packet nfmark in the connection\n"
+"  --restore-mark [--mask mask]  Restore saved nfmark value\n");
+}
+
+static const struct option CONNMARK_opts[] = {
+	{ "set-mark", 1, NULL, '1' },
+	{ "save-mark", 0, NULL, '2' },
+	{ "restore-mark", 0, NULL, '3' },
+	{ "mask", 1, NULL, '4' },
+	{ .name = NULL }
+};
+
+static const struct option connmark_tg_opts[] = {
+	{.name = "set-xmark",     .has_arg = true,  .val = '='},
+	{.name = "set-mark",      .has_arg = true,  .val = '-'},
+	{.name = "and-mark",      .has_arg = true,  .val = '&'},
+	{.name = "or-mark",       .has_arg = true,  .val = '|'},
+	{.name = "xor-mark",      .has_arg = true,  .val = '^'},
+	{.name = "save-mark",     .has_arg = false, .val = 'S'},
+	{.name = "restore-mark",  .has_arg = false, .val = 'R'},
+	{.name = "ctmask",        .has_arg = true,  .val = 'c'},
+	{.name = "nfmask",        .has_arg = true,  .val = 'n'},
+	{.name = "mask",          .has_arg = true,  .val = 'm'},
+	{.name = NULL},
+};
+
+static void connmark_tg_help(void)
+{
+	printf(
+"CONNMARK target options:\n"
+"  --set-xmark value[/ctmask]    Zero mask bits and XOR ctmark with value\n"
+"  --save-mark [--ctmask mask] [--nfmask mask]\n"
+"                                Copy ctmark to nfmark using masks\n"
+"  --restore-mark [--ctmask mask] [--nfmask mask]\n"
+"                                Copy nfmark to ctmark using masks\n"
+"  --set-mark value[/mask]       Set conntrack mark value\n"
+"  --save-mark [--mask mask]     Save the packet nfmark in the connection\n"
+"  --restore-mark [--mask mask]  Restore saved nfmark value\n"
+"  --and-mark value              Binary AND the ctmark with bits\n"
+"  --or-mark value               Binary OR  the ctmark with bits\n"
+"  --xor-mark value              Binary XOR the ctmark with bits\n"
+);
+}
+
+static void connmark_tg_init(struct xt_entry_target *target)
+{
+	struct xt_connmark_tginfo1 *info = (void *)target->data;
+
+	/*
+	 * Need these defaults for --save-mark/--restore-mark if no
+	 * --ctmark or --nfmask is given.
+	 */
+	info->ctmask = UINT32_MAX;
+	info->nfmask = UINT32_MAX;
+}
+
+static int
+CONNMARK_parse(int c, char **argv, int invert, unsigned int *flags,
+               const void *entry, struct xt_entry_target **target)
+{
+	struct xt_connmark_target_info *markinfo
+		= (struct xt_connmark_target_info *)(*target)->data;
+
+	switch (c) {
+		char *end;
+	case '1':
+		markinfo->mode = XT_CONNMARK_SET;
+
+		markinfo->mark = strtoul(optarg, &end, 0);
+		if (*end == '/' && end[1] != '\0')
+		    markinfo->mask = strtoul(end+1, &end, 0);
+
+		if (*end != '\0' || end == optarg)
+			xtables_error(PARAMETER_PROBLEM, "Bad MARK value \"%s\"", optarg);
+		if (*flags)
+			xtables_error(PARAMETER_PROBLEM,
+			           "CONNMARK target: Can't specify --set-mark twice");
+		*flags = 1;
+		break;
+	case '2':
+		markinfo->mode = XT_CONNMARK_SAVE;
+		if (*flags)
+			xtables_error(PARAMETER_PROBLEM,
+			           "CONNMARK target: Can't specify --save-mark twice");
+		*flags = 1;
+		break;
+	case '3':
+		markinfo->mode = XT_CONNMARK_RESTORE;
+		if (*flags)
+			xtables_error(PARAMETER_PROBLEM,
+			           "CONNMARK target: Can't specify --restore-mark twice");
+		*flags = 1;
+		break;
+	case '4':
+		if (!*flags)
+			xtables_error(PARAMETER_PROBLEM,
+			           "CONNMARK target: Can't specify --mask without a operation");
+		markinfo->mask = strtoul(optarg, &end, 0);
+
+		if (*end != '\0' || end == optarg)
+			xtables_error(PARAMETER_PROBLEM, "Bad MASK value \"%s\"", optarg);
+		break;
+	default:
+		return 0;
+	}
+
+	return 1;
+}
+
+static int connmark_tg_parse(int c, char **argv, int invert,
+                             unsigned int *flags, const void *entry,
+                             struct xt_entry_target **target)
+{
+	struct xt_connmark_tginfo1 *info = (void *)(*target)->data;
+	unsigned int value, mask = UINT32_MAX;
+	char *end;
+
+	switch (c) {
+	case '=': /* --set-xmark */
+	case '-': /* --set-mark */
+		xtables_param_act(XTF_ONE_ACTION, "CONNMARK", *flags & F_MARK);
+		if (!xtables_strtoui(optarg, &end, &value, 0, UINT32_MAX))
+			xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--set-xmark/--set-mark", optarg);
+		if (*end == '/')
+			if (!xtables_strtoui(end + 1, &end, &mask, 0, UINT32_MAX))
+				xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--set-xmark/--set-mark", optarg);
+		if (*end != '\0')
+			xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--set-xmark/--set-mark", optarg);
+		info->mode   = XT_CONNMARK_SET;
+		info->ctmark = value;
+		info->ctmask = mask;
+		if (c == '-')
+			info->ctmask |= value;
+		*flags |= F_MARK;
+		return true;
+
+	case '&': /* --and-mark */
+		xtables_param_act(XTF_ONE_ACTION, "CONNMARK", *flags & F_MARK);
+		if (!xtables_strtoui(optarg, NULL, &mask, 0, UINT32_MAX))
+			xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--and-mark", optarg);
+		info->mode   = XT_CONNMARK_SET;
+		info->ctmark = 0;
+		info->ctmask = ~mask;
+		*flags      |= F_MARK;
+		return true;
+
+	case '|': /* --or-mark */
+		xtables_param_act(XTF_ONE_ACTION, "CONNMARK", *flags & F_MARK);
+		if (!xtables_strtoui(optarg, NULL, &value, 0, UINT32_MAX))
+			xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--or-mark", optarg);
+		info->mode   = XT_CONNMARK_SET;
+		info->ctmark = value;
+		info->ctmask = value;
+		*flags      |= F_MARK;
+		return true;
+
+	case '^': /* --xor-mark */
+		xtables_param_act(XTF_ONE_ACTION, "CONNMARK", *flags & F_MARK);
+		if (!xtables_strtoui(optarg, NULL, &value, 0, UINT32_MAX))
+			xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--xor-mark", optarg);
+		info->mode   = XT_CONNMARK_SET;
+		info->ctmark = value;
+		info->ctmask = 0;
+		*flags      |= F_MARK;
+		return true;
+
+	case 'S': /* --save-mark */
+		xtables_param_act(XTF_ONE_ACTION, "CONNMARK", *flags & F_MARK);
+		info->mode = XT_CONNMARK_SAVE;
+		*flags |= F_MARK | F_SR_MARK;
+		return true;
+
+	case 'R': /* --restore-mark */
+		xtables_param_act(XTF_ONE_ACTION, "CONNMARK", *flags & F_MARK);
+		info->mode = XT_CONNMARK_RESTORE;
+		*flags |= F_MARK | F_SR_MARK;
+		return true;
+
+	case 'n': /* --nfmask */
+		if (!(*flags & F_SR_MARK))
+			xtables_error(PARAMETER_PROBLEM, "CONNMARK: --save-mark "
+			           "or --restore-mark is required for "
+			           "--nfmask");
+		if (!xtables_strtoui(optarg, NULL, &value, 0, UINT32_MAX))
+			xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--nfmask", optarg);
+		info->nfmask = value;
+		return true;
+
+	case 'c': /* --ctmask */
+		if (!(*flags & F_SR_MARK))
+			xtables_error(PARAMETER_PROBLEM, "CONNMARK: --save-mark "
+			           "or --restore-mark is required for "
+			           "--ctmask");
+		if (!xtables_strtoui(optarg, NULL, &value, 0, UINT32_MAX))
+			xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--ctmask", optarg);
+		info->ctmask = value;
+		return true;
+
+	case 'm': /* --mask */
+		if (!(*flags & F_SR_MARK))
+			xtables_error(PARAMETER_PROBLEM, "CONNMARK: --save-mark "
+			           "or --restore-mark is required for "
+			           "--mask");
+		if (!xtables_strtoui(optarg, NULL, &value, 0, UINT32_MAX))
+			xtables_param_act(XTF_BAD_VALUE, "CONNMARK", "--mask", optarg);
+		info->nfmask = info->ctmask = value;
+		return true;
+	}
+
+	return false;
+}
+
+static void connmark_tg_check(unsigned int flags)
+{
+	if (!flags)
+		xtables_error(PARAMETER_PROBLEM,
+		           "CONNMARK target: No operation specified");
+}
+
+static void
+print_mark(unsigned long mark)
+{
+	printf("0x%lx", mark);
+}
+
+static void
+print_mask(const char *text, unsigned long mask)
+{
+	if (mask != 0xffffffffUL)
+		printf("%s0x%lx", text, mask);
+}
+
+static void CONNMARK_print(const void *ip,
+                           const struct xt_entry_target *target, int numeric)
+{
+	const struct xt_connmark_target_info *markinfo =
+		(const struct xt_connmark_target_info *)target->data;
+	switch (markinfo->mode) {
+	case XT_CONNMARK_SET:
+	    printf("CONNMARK set ");
+	    print_mark(markinfo->mark);
+	    print_mask("/", markinfo->mask);
+	    printf(" ");
+	    break;
+	case XT_CONNMARK_SAVE:
+	    printf("CONNMARK save ");
+	    print_mask("mask ", markinfo->mask);
+	    printf(" ");
+	    break;
+	case XT_CONNMARK_RESTORE:
+	    printf("CONNMARK restore ");
+	    print_mask("mask ", markinfo->mask);
+	    break;
+	default:
+	    printf("ERROR: UNKNOWN CONNMARK MODE ");
+	    break;
+	}
+}
+
+static void
+connmark_tg_print(const void *ip, const struct xt_entry_target *target,
+                  int numeric)
+{
+	const struct xt_connmark_tginfo1 *info = (const void *)target->data;
+
+	switch (info->mode) {
+	case XT_CONNMARK_SET:
+		if (info->ctmark == 0)
+			printf("CONNMARK and 0x%x ",
+			       (unsigned int)(u_int32_t)~info->ctmask);
+		else if (info->ctmark == info->ctmask)
+			printf("CONNMARK or 0x%x ", info->ctmark);
+		else if (info->ctmask == 0)
+			printf("CONNMARK xor 0x%x ", info->ctmark);
+		else if (info->ctmask == 0xFFFFFFFFU)
+			printf("CONNMARK set 0x%x ", info->ctmark);
+		else
+			printf("CONNMARK xset 0x%x/0x%x ",
+			       info->ctmark, info->ctmask);
+		break;
+	case XT_CONNMARK_SAVE:
+		if (info->nfmask == UINT32_MAX && info->ctmask == UINT32_MAX)
+			printf("CONNMARK save ");
+		else if (info->nfmask == info->ctmask)
+			printf("CONNMARK save mask 0x%x ", info->nfmask);
+		else
+			printf("CONNMARK save nfmask 0x%x ctmask ~0x%x ",
+			       info->nfmask, info->ctmask);
+		break;
+	case XT_CONNMARK_RESTORE:
+		if (info->ctmask == UINT32_MAX && info->nfmask == UINT32_MAX)
+			printf("CONNMARK restore ");
+		else if (info->ctmask == info->nfmask)
+			printf("CONNMARK restore mask 0x%x ", info->ctmask);
+		else
+			printf("CONNMARK restore ctmask 0x%x nfmask ~0x%x ",
+			       info->ctmask, info->nfmask);
+		break;
+
+	default:
+		printf("ERROR: UNKNOWN CONNMARK MODE");
+		break;
+	}
+}
+
+static void CONNMARK_save(const void *ip, const struct xt_entry_target *target)
+{
+	const struct xt_connmark_target_info *markinfo =
+		(const struct xt_connmark_target_info *)target->data;
+
+	switch (markinfo->mode) {
+	case XT_CONNMARK_SET:
+	    printf("--set-mark ");
+	    print_mark(markinfo->mark);
+	    print_mask("/", markinfo->mask);
+	    printf(" ");
+	    break;
+	case XT_CONNMARK_SAVE:
+	    printf("--save-mark ");
+	    print_mask("--mask ", markinfo->mask);
+	    break;
+	case XT_CONNMARK_RESTORE:
+	    printf("--restore-mark ");
+	    print_mask("--mask ", markinfo->mask);
+	    break;
+	default:
+	    printf("ERROR: UNKNOWN CONNMARK MODE ");
+	    break;
+	}
+}
+
+static void CONNMARK_init(struct xt_entry_target *t)
+{
+	struct xt_connmark_target_info *markinfo
+		= (struct xt_connmark_target_info *)t->data;
+
+	markinfo->mask = 0xffffffffUL;
+}
+
+static void
+connmark_tg_save(const void *ip, const struct xt_entry_target *target)
+{
+	const struct xt_connmark_tginfo1 *info = (const void *)target->data;
+
+	switch (info->mode) {
+	case XT_CONNMARK_SET:
+		printf("--set-xmark 0x%x/0x%x ", info->ctmark, info->ctmask);
+		break;
+	case XT_CONNMARK_SAVE:
+		printf("--save-mark --nfmask 0x%x --ctmask 0x%x ",
+		       info->nfmask, info->ctmask);
+		break;
+	case XT_CONNMARK_RESTORE:
+		printf("--restore-mark --nfmask 0x%x --ctmask 0x%x ",
+		       info->nfmask, info->ctmask);
+		break;
+	default:
+		printf("ERROR: UNKNOWN CONNMARK MODE");
+		break;
+	}
+}
+
+static struct xtables_target connmark_tg_reg[] = {
+	{
+		.family        = NFPROTO_UNSPEC,
+		.name          = "CONNMARK",
+		.revision      = 0,
+		.version       = XTABLES_VERSION,
+		.size          = XT_ALIGN(sizeof(struct xt_connmark_target_info)),
+		.userspacesize = XT_ALIGN(sizeof(struct xt_connmark_target_info)),
+		.help          = CONNMARK_help,
+		.init          = CONNMARK_init,
+		.parse         = CONNMARK_parse,
+		.final_check   = connmark_tg_check,
+		.print         = CONNMARK_print,
+		.save          = CONNMARK_save,
+		.extra_opts    = CONNMARK_opts,
+	},
+	{
+		.version       = XTABLES_VERSION,
+		.name          = "CONNMARK",
+		.revision      = 1,
+		.family        = NFPROTO_UNSPEC,
+		.size          = XT_ALIGN(sizeof(struct xt_connmark_tginfo1)),
+		.userspacesize = XT_ALIGN(sizeof(struct xt_connmark_tginfo1)),
+		.help          = connmark_tg_help,
+		.init          = connmark_tg_init,
+		.parse         = connmark_tg_parse,
+		.final_check   = connmark_tg_check,
+		.print         = connmark_tg_print,
+		.save          = connmark_tg_save,
+		.extra_opts    = connmark_tg_opts,
+	},
+};
+
+void _init(void)
+{
+	xtables_register_targets(connmark_tg_reg, ARRAY_SIZE(connmark_tg_reg));
+}