libxt_TOS

Move libipt_TOS revision 0 to libxt_TOS revision 0 and add support
for xt_TOS target revision 1.

Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>

1 files changed, 257 insertions, 0 deletions

diff --git a/extensions/libxt_TOS.c b/extensions/libxt_TOS.c
new file mode 100644
index 00000000..74ec2b52
--- /dev/null
+++ b/extensions/libxt_TOS.c
@@ -0,0 +1,257 @@
+/*
+ * Shared library add-on to iptables to add TOS target support
+ *
+ * Copyright © CC Computer Consultants GmbH, 2007
+ * Contact: Jan Engelhardt <jengelh@computergmbh.de>
+ */
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <xtables.h>
+#include <linux/netfilter/xt_DSCP.h>
+#include <linux/netfilter_ipv4/ipt_TOS.h>
+#include "tos_values.c"
+
+enum {
+	FLAG_TOS = 1 << 0,
+};
+
+static const struct option tos_tg_opts_v0[] = {
+	{.name = "set-tos", .has_arg = true, .val = '='},
+	{},
+};
+
+static const struct option tos_tg_opts[] = {
+	{.name = "set-tos", .has_arg = true, .val = '='},
+	{.name = "and-tos", .has_arg = true, .val = '&'},
+	{.name = "or-tos",  .has_arg = true, .val = '|'},
+	{.name = "xor-tos", .has_arg = true, .val = '^'},
+	{},
+};
+
+static void tos_tg_help_v0(void)
+{
+	const struct tos_symbol_info *symbol;
+
+	printf(
+"TOS target options:\n"
+"  --set-tos value     Set Type of Service/Priority field to value\n"
+"  --set-tos symbol    Set TOS field (IPv4 only) by symbol\n"
+"                      Accepted symbolic names for value are:\n");
+
+	for (symbol = tos_symbol_names; symbol->name != NULL; ++symbol)
+		printf("                        (0x%02x) %2u %s\n",
+		       symbol->value, symbol->value, symbol->name);
+
+	printf("\n");
+}
+
+static void tos_tg_help(void)
+{
+	const struct tos_symbol_info *symbol;
+
+	printf(
+"TOS target v%s options:\n"
+"  --set-tos value[/mask]  Set Type of Service/Priority field to value\n"
+"                          (Zero out bits in mask and XOR value into TOS)\n"
+"  --set-tos symbol        Set TOS field (IPv4 only) by symbol\n"
+"                          (this zeroes the 4-bit Precedence part!)\n"
+"                          Accepted symbolic names for value are:\n",
+IPTABLES_VERSION);
+
+	for (symbol = tos_symbol_names; symbol->name != NULL; ++symbol)
+		printf("                            (0x%02x) %2u %s\n",
+		       symbol->value, symbol->value, symbol->name);
+
+	printf(
+"\n"
+"  --and-tos bits          Binary AND the TOS value with bits\n"
+"  --or-tos  bits          Binary OR the TOS value with bits\n"
+"  --xor-tos bits          Binary XOR the TOS value with bits\n"
+);
+}
+
+static int tos_tg_parse_v0(int c, char **argv, int invert, unsigned int *flags,
+                           const void *entry, struct xt_entry_target **target)
+{
+	struct ipt_tos_target_info *info = (void *)(*target)->data;
+	struct tos_value_mask tvm;
+
+	switch (c) {
+	case '=':
+		param_act(P_ONLY_ONCE, "TOS", "--set-tos", *flags & FLAG_TOS);
+		param_act(P_NO_INVERT, "TOS", "--set-tos", invert);
+		if (!tos_parse_symbolic(optarg, &tvm, 0xFF))
+			param_act(P_BAD_VALUE, "TOS", "--set-tos", optarg);
+		if (tvm.mask != 0xFF)
+			exit_error(PARAMETER_PROBLEM, "tos match: Your kernel "
+			           "is too old to support anything besides "
+				   "/0xFF as a mask.");
+		info->tos = tvm.value;
+		*flags |= FLAG_TOS;
+		return true;
+	}
+
+	return false;
+}
+
+static int tos_tg_parse(int c, char **argv, int invert, unsigned int *flags,
+                         const void *entry, struct xt_entry_target **target)
+{
+	struct xt_tos_target_info *info = (void *)(*target)->data;
+	struct tos_value_mask tvm;
+	unsigned int bits;
+
+	switch (c) {
+	case '=': /* --set-tos */
+		param_act(P_ONLY_ONCE, "TOS", "--set-tos", *flags & FLAG_TOS);
+		param_act(P_NO_INVERT, "TOS", "--set-tos", invert);
+		if (!tos_parse_symbolic(optarg, &tvm, 0x3F))
+			param_act(P_BAD_VALUE, "TOS", "--set-tos", optarg);
+		info->tos_value = tvm.value;
+		info->tos_mask  = tvm.mask;
+		break;
+
+	case '&': /* --and-tos */
+		param_act(P_ONLY_ONCE, "TOS", "--and-tos", *flags & FLAG_TOS);
+		param_act(P_NO_INVERT, "TOS", "--and-tos", invert);
+		if (!strtonum(optarg, NULL, &bits, 0, 0xFF))
+			param_act(P_BAD_VALUE, "TOS", "--and-tos", optarg);
+		info->tos_value = 0;
+		info->tos_mask  = ~bits;
+		break;
+
+	case '|': /* --or-tos */
+		param_act(P_ONLY_ONCE, "TOS", "--or-tos", *flags & FLAG_TOS);
+		param_act(P_NO_INVERT, "TOS", "--or-tos", invert);
+		if (!strtonum(optarg, NULL, &bits, 0, 0xFF))
+			param_act(P_BAD_VALUE, "TOS", "--or-tos", optarg);
+		info->tos_value = bits;
+		info->tos_mask  = bits;
+		break;
+
+	case '^': /* --xor-tos */
+		param_act(P_ONLY_ONCE, "TOS", "--xor-tos", *flags & FLAG_TOS);
+		param_act(P_NO_INVERT, "TOS", "--xor-tos", invert);
+		if (!strtonum(optarg, NULL, &bits, 0, 0xFF))
+			param_act(P_BAD_VALUE, "TOS", "--xor-tos", optarg);
+		info->tos_value = bits;
+		info->tos_mask  = 0;
+		break;
+
+	default:
+		return false;
+	}
+
+	*flags |= FLAG_TOS;
+	return true;
+}
+
+static void tos_tg_check(unsigned int flags)
+{
+	if (flags == 0)
+		exit_error(PARAMETER_PROBLEM,
+		           "TOS: The --set-tos parameter is required");
+}
+
+static void tos_tg_print_v0(const void *ip,
+                            const struct xt_entry_target *target, int numeric)
+{
+	const struct ipt_tos_target_info *info = (const void *)target->data;
+
+	printf("TOS set ");
+	if (numeric || !tos_try_print_symbolic("", info->tos, 0xFF))
+		printf("0x%02x ", info->tos);
+}
+
+static void tos_tg_print(const void *ip, const struct xt_entry_target *target,
+                         int numeric)
+{
+	const struct xt_tos_target_info *info = (const void *)target->data;
+
+	if (numeric)
+		printf("TOS set 0x%02x/0x%02x ",
+		       info->tos_value, info->tos_mask);
+	else if (tos_try_print_symbolic("TOS set ",
+	    info->tos_value, info->tos_mask))
+		/* already printed by call */
+		return;
+	else if (info->tos_value == 0)
+		printf("TOS and 0x%02x ",
+		       (unsigned int)(u_int8_t)~info->tos_mask);
+	else if (info->tos_value == info->tos_mask)
+		printf("TOS or 0x%02x ", info->tos_value);
+	else if (info->tos_mask == 0)
+		printf("TOS xor 0x%02x ", info->tos_value);
+	else
+		printf("TOS set 0x%02x/0x%02x ",
+		       info->tos_value, info->tos_mask);
+}
+
+static void tos_tg_save_v0(const void *ip, const struct xt_entry_target *target)
+{
+	const struct ipt_tos_target_info *info = (const void *)target->data;
+
+	printf("--set-tos 0x%02x ", info->tos);
+}
+
+static void tos_tg_save(const void *ip, const struct xt_entry_target *target)
+{
+	const struct xt_tos_target_info *info = (const void *)target->data;
+
+	printf("--set-tos 0x%02x/0x%02x ", info->tos_value, info->tos_mask);
+}
+
+static struct xtables_target tos_tg_reg_v0 = {
+	.version       = IPTABLES_VERSION,
+	.name          = "TOS",
+	.revision      = 0,
+	.family        = AF_INET,
+	.size          = XT_ALIGN(sizeof(struct xt_tos_target_info)),
+	.userspacesize = XT_ALIGN(sizeof(struct xt_tos_target_info)),
+	.help          = tos_tg_help_v0,
+	.parse         = tos_tg_parse_v0,
+	.final_check   = tos_tg_check,
+	.print         = tos_tg_print_v0,
+	.save          = tos_tg_save_v0,
+	.extra_opts    = tos_tg_opts_v0,
+};
+
+static struct xtables_target tos_tg_reg = {
+	.version       = IPTABLES_VERSION,
+	.name          = "TOS",
+	.revision      = 1,
+	.family        = AF_INET,
+	.size          = XT_ALIGN(sizeof(struct xt_tos_target_info)),
+	.userspacesize = XT_ALIGN(sizeof(struct xt_tos_target_info)),
+	.help          = tos_tg_help,
+	.parse         = tos_tg_parse,
+	.final_check   = tos_tg_check,
+	.print         = tos_tg_print,
+	.save          = tos_tg_save,
+	.extra_opts    = tos_tg_opts,
+};
+
+static struct xtables_target tos_tg6_reg = {
+	.version       = IPTABLES_VERSION,
+	.name          = "TOS",
+	.family        = AF_INET6,
+	.revision      = 1,
+	.size          = XT_ALIGN(sizeof(struct xt_tos_target_info)),
+	.userspacesize = XT_ALIGN(sizeof(struct xt_tos_target_info)),
+	.help          = tos_tg_help,
+	.parse         = tos_tg_parse,
+	.final_check   = tos_tg_check,
+	.print         = tos_tg_print,
+	.save          = tos_tg_save,
+	.extra_opts    = tos_tg_opts,
+};
+
+void _init(void)
+{
+	xtables_register_target(&tos_tg_reg_v0);
+	xtables_register_target(&tos_tg_reg);
+	xtables_register_target(&tos_tg6_reg);
+}