[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/iptables/extensions/libxt_TCPMSS.c b/ap/app/iptables/extensions/libxt_TCPMSS.c
new file mode 100755
index 0000000..ac9e2d0
--- /dev/null
+++ b/ap/app/iptables/extensions/libxt_TCPMSS.c
@@ -0,0 +1,154 @@
+/* Shared library add-on to iptables to add TCPMSS target support.
+ *
+ * Copyright (c) 2000 Marc Boucher
+*/
+#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_TCPMSS.h>
+
+struct mssinfo {
+ struct xt_entry_target t;
+ struct xt_tcpmss_info mss;
+};
+
+static void __TCPMSS_help(int hdrsize)
+{
+ printf(
+"TCPMSS target mutually-exclusive options:\n"
+" --set-mss value explicitly set MSS option to specified value\n"
+" --clamp-mss-to-pmtu automatically clamp MSS value to (path_MTU - %d)\n",
+hdrsize);
+}
+
+static void TCPMSS_help(void)
+{
+ __TCPMSS_help(40);
+}
+
+static void TCPMSS_help6(void)
+{
+ __TCPMSS_help(60);
+}
+
+static const struct option TCPMSS_opts[] = {
+ { "set-mss", 1, NULL, '1' },
+ { "clamp-mss-to-pmtu", 0, NULL, '2' },
+ { .name = NULL }
+};
+
+static int __TCPMSS_parse(int c, char **argv, int invert, unsigned int *flags,
+ const void *entry, struct xt_entry_target **target,
+ int hdrsize)
+{
+ struct xt_tcpmss_info *mssinfo
+ = (struct xt_tcpmss_info *)(*target)->data;
+
+ switch (c) {
+ unsigned int mssval;
+
+ case '1':
+ if (*flags)
+ xtables_error(PARAMETER_PROBLEM,
+ "TCPMSS target: Only one option may be specified");
+ if (!xtables_strtoui(optarg, NULL, &mssval,
+ 0, UINT16_MAX - hdrsize))
+ xtables_error(PARAMETER_PROBLEM, "Bad TCPMSS value \"%s\"", optarg);
+
+ mssinfo->mss = mssval;
+ *flags = 1;
+ break;
+
+ case '2':
+ if (*flags)
+ xtables_error(PARAMETER_PROBLEM,
+ "TCPMSS target: Only one option may be specified");
+ mssinfo->mss = XT_TCPMSS_CLAMP_PMTU;
+ *flags = 1;
+ break;
+
+ default:
+ return 0;
+ }
+
+ return 1;
+}
+
+static int TCPMSS_parse(int c, char **argv, int invert, unsigned int *flags,
+ const void *entry, struct xt_entry_target **target)
+{
+ return __TCPMSS_parse(c, argv, invert, flags, entry, target, 40);
+}
+
+static int TCPMSS_parse6(int c, char **argv, int invert, unsigned int *flags,
+ const void *entry, struct xt_entry_target **target)
+{
+ return __TCPMSS_parse(c, argv, invert, flags, entry, target, 60);
+}
+
+static void TCPMSS_check(unsigned int flags)
+{
+ if (!flags)
+ xtables_error(PARAMETER_PROBLEM,
+ "TCPMSS target: At least one parameter is required");
+}
+
+static void TCPMSS_print(const void *ip, const struct xt_entry_target *target,
+ int numeric)
+{
+ const struct xt_tcpmss_info *mssinfo =
+ (const struct xt_tcpmss_info *)target->data;
+ if(mssinfo->mss == XT_TCPMSS_CLAMP_PMTU)
+ printf("TCPMSS clamp to PMTU ");
+ else
+ printf("TCPMSS set %u ", mssinfo->mss);
+}
+
+static void TCPMSS_save(const void *ip, const struct xt_entry_target *target)
+{
+ const struct xt_tcpmss_info *mssinfo =
+ (const struct xt_tcpmss_info *)target->data;
+
+ if(mssinfo->mss == XT_TCPMSS_CLAMP_PMTU)
+ printf("--clamp-mss-to-pmtu ");
+ else
+ printf("--set-mss %u ", mssinfo->mss);
+}
+
+static struct xtables_target tcpmss_target = {
+ .family = NFPROTO_IPV4,
+ .name = "TCPMSS",
+ .version = XTABLES_VERSION,
+ .size = XT_ALIGN(sizeof(struct xt_tcpmss_info)),
+ .userspacesize = XT_ALIGN(sizeof(struct xt_tcpmss_info)),
+ .help = TCPMSS_help,
+ .parse = TCPMSS_parse,
+ .final_check = TCPMSS_check,
+ .print = TCPMSS_print,
+ .save = TCPMSS_save,
+ .extra_opts = TCPMSS_opts,
+};
+
+static struct xtables_target tcpmss_target6 = {
+ .family = NFPROTO_IPV6,
+ .name = "TCPMSS",
+ .version = XTABLES_VERSION,
+ .size = XT_ALIGN(sizeof(struct xt_tcpmss_info)),
+ .userspacesize = XT_ALIGN(sizeof(struct xt_tcpmss_info)),
+ .help = TCPMSS_help6,
+ .parse = TCPMSS_parse6,
+ .final_check = TCPMSS_check,
+ .print = TCPMSS_print,
+ .save = TCPMSS_save,
+ .extra_opts = TCPMSS_opts,
+};
+
+void _init(void)
+{
+ xtables_register_target(&tcpmss_target);
+ xtables_register_target(&tcpmss_target6);
+}