[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/libipt_MASQUERADE.c b/ap/app/iptables/extensions/libipt_MASQUERADE.c
new file mode 100755
index 0000000..82c2230
--- /dev/null
+++ b/ap/app/iptables/extensions/libipt_MASQUERADE.c
@@ -0,0 +1,165 @@
+/* Shared library add-on to iptables to add masquerade support. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <xtables.h>
+#include <limits.h> /* INT_MAX in ip_tables.h */
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <net/netfilter/nf_nat.h>
+
+static void MASQUERADE_help(void)
+{
+ printf(
+"MASQUERADE target options:\n"
+" --to-ports <port>[-<port>]\n"
+" Port (range) to map to.\n"
+" --random\n"
+" Randomize source port.\n");
+}
+
+static const struct option MASQUERADE_opts[] = {
+ { "to-ports", 1, NULL, '1' },
+ { "random", 0, NULL, '2' },
+ { .name = NULL }
+};
+
+static void MASQUERADE_init(struct xt_entry_target *t)
+{
+ struct nf_nat_multi_range *mr = (struct nf_nat_multi_range *)t->data;
+
+ /* Actually, it's 0, but it's ignored at the moment. */
+ mr->rangesize = 1;
+
+}
+
+/* Parses ports */
+static void
+parse_ports(const char *arg, struct nf_nat_multi_range *mr)
+{
+ const char *dash;
+ int port;
+
+ mr->range[0].flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
+
+ port = atoi(arg);
+ if (port <= 0 || port > 65535)
+ xtables_error(PARAMETER_PROBLEM, "Port \"%s\" not valid\n", arg);
+
+ dash = strchr(arg, '-');
+ if (!dash) {
+ mr->range[0].min.tcp.port
+ = mr->range[0].max.tcp.port
+ = htons(port);
+ } else {
+ int maxport;
+
+ maxport = atoi(dash + 1);
+ if (maxport == 0 || maxport > 65535)
+ xtables_error(PARAMETER_PROBLEM,
+ "Port `%s' not valid\n", dash+1);
+ if (maxport < port)
+ /* People are stupid. Present reader excepted. */
+ xtables_error(PARAMETER_PROBLEM,
+ "Port range `%s' funky\n", arg);
+ mr->range[0].min.tcp.port = htons(port);
+ mr->range[0].max.tcp.port = htons(maxport);
+ }
+}
+
+static int MASQUERADE_parse(int c, char **argv, int invert, unsigned int *flags,
+ const void *e, struct xt_entry_target **target)
+{
+ const struct ipt_entry *entry = e;
+ int portok;
+ struct nf_nat_multi_range *mr
+ = (struct nf_nat_multi_range *)(*target)->data;
+
+ if (entry->ip.proto == IPPROTO_TCP
+ || entry->ip.proto == IPPROTO_UDP
+ || entry->ip.proto == IPPROTO_SCTP
+ || entry->ip.proto == IPPROTO_DCCP
+ || entry->ip.proto == IPPROTO_ICMP)
+ portok = 1;
+ else
+ portok = 0;
+
+ switch (c) {
+ case '1':
+ if (!portok)
+ xtables_error(PARAMETER_PROBLEM,
+ "Need TCP, UDP, SCTP or DCCP with port specification");
+
+ if (xtables_check_inverse(optarg, &invert, NULL, 0))
+ xtables_error(PARAMETER_PROBLEM,
+ "Unexpected `!' after --to-ports");
+
+ parse_ports(optarg, mr);
+ return 1;
+
+ case '2':
+ mr->range[0].flags |= IP_NAT_RANGE_PROTO_RANDOM;
+ return 1;
+
+ default:
+ return 0;
+ }
+}
+
+static void
+MASQUERADE_print(const void *ip, const struct xt_entry_target *target,
+ int numeric)
+{
+ struct nf_nat_multi_range *mr
+ = (struct nf_nat_multi_range *)target->data;
+ struct nf_nat_range *r = &mr->range[0];
+
+ if (r->flags & IP_NAT_RANGE_PROTO_SPECIFIED) {
+ printf("masq ports: ");
+ printf("%hu", ntohs(r->min.tcp.port));
+ if (r->max.tcp.port != r->min.tcp.port)
+ printf("-%hu", ntohs(r->max.tcp.port));
+ printf(" ");
+ }
+
+ if (r->flags & IP_NAT_RANGE_PROTO_RANDOM)
+ printf("random ");
+}
+
+static void
+MASQUERADE_save(const void *ip, const struct xt_entry_target *target)
+{
+ struct nf_nat_multi_range *mr
+ = (struct nf_nat_multi_range *)target->data;
+ struct nf_nat_range *r = &mr->range[0];
+
+ if (r->flags & IP_NAT_RANGE_PROTO_SPECIFIED) {
+ printf("--to-ports %hu", ntohs(r->min.tcp.port));
+ if (r->max.tcp.port != r->min.tcp.port)
+ printf("-%hu", ntohs(r->max.tcp.port));
+ printf(" ");
+ }
+
+ if (r->flags & IP_NAT_RANGE_PROTO_RANDOM)
+ printf("--random ");
+}
+
+static struct xtables_target masquerade_tg_reg = {
+ .name = "MASQUERADE",
+ .version = XTABLES_VERSION,
+ .family = NFPROTO_IPV4,
+ .size = XT_ALIGN(sizeof(struct nf_nat_multi_range)),
+ .userspacesize = XT_ALIGN(sizeof(struct nf_nat_multi_range)),
+ .help = MASQUERADE_help,
+ .init = MASQUERADE_init,
+ .parse = MASQUERADE_parse,
+ .print = MASQUERADE_print,
+ .save = MASQUERADE_save,
+ .extra_opts = MASQUERADE_opts,
+};
+
+void _init(void)
+{
+ xtables_register_target(&masquerade_tg_reg);
+}