Adding upstream version 6.1.0.upstream/6.1.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 197 insertions, 0 deletions

diff --git a/tc/m_nat.c b/tc/m_nat.c
new file mode 100644
index 0000000..654f9a3
--- /dev/null
+++ b/tc/m_nat.c
@@ -0,0 +1,197 @@
+/*
+ * m_nat.c		NAT module
+ *
+ *		This program is free software; you can distribute 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.
+ *
+ * Authors:	Herbert Xu <herbert@gondor.apana.org.au>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+#include "utils.h"
+#include "tc_util.h"
+#include <linux/tc_act/tc_nat.h>
+
+static void
+explain(void)
+{
+	fprintf(stderr, "Usage: ... nat NAT\n"
+			"NAT := DIRECTION OLD NEW\n"
+			"DIRECTION := { ingress | egress }\n"
+			"OLD := PREFIX\n"
+			"NEW := ADDRESS\n");
+}
+
+static void
+usage(void)
+{
+	explain();
+	exit(-1);
+}
+
+static int
+parse_nat_args(int *argc_p, char ***argv_p, struct tc_nat *sel)
+{
+	int argc = *argc_p;
+	char **argv = *argv_p;
+	inet_prefix addr;
+
+	if (argc <= 0)
+		return -1;
+
+	if (matches(*argv, "egress") == 0)
+		sel->flags |= TCA_NAT_FLAG_EGRESS;
+	else if (matches(*argv, "ingress") != 0)
+		goto bad_val;
+
+	NEXT_ARG();
+
+	if (get_prefix_1(&addr, *argv, AF_INET))
+		goto bad_val;
+
+	sel->old_addr = addr.data[0];
+	sel->mask = htonl(~0u << (32 - addr.bitlen));
+
+	NEXT_ARG();
+
+	if (get_prefix_1(&addr, *argv, AF_INET))
+		goto bad_val;
+
+	sel->new_addr = addr.data[0];
+
+	argc--;
+	argv++;
+
+	*argc_p = argc;
+	*argv_p = argv;
+	return 0;
+
+bad_val:
+	return -1;
+}
+
+static int
+parse_nat(struct action_util *a, int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
+{
+	struct tc_nat sel = {};
+
+	int argc = *argc_p;
+	char **argv = *argv_p;
+	int ok = 0;
+	struct rtattr *tail;
+
+	while (argc > 0) {
+		if (matches(*argv, "nat") == 0) {
+			NEXT_ARG();
+			if (parse_nat_args(&argc, &argv, &sel)) {
+				fprintf(stderr, "Illegal nat construct (%s)\n",
+					*argv);
+				explain();
+				return -1;
+			}
+			ok++;
+			continue;
+		} else if (matches(*argv, "help") == 0) {
+			usage();
+		} else {
+			break;
+		}
+
+	}
+
+	if (!ok) {
+		explain();
+		return -1;
+	}
+
+	parse_action_control_dflt(&argc, &argv, &sel.action, false, TC_ACT_OK);
+
+	if (argc) {
+		if (matches(*argv, "index") == 0) {
+			NEXT_ARG();
+			if (get_u32(&sel.index, *argv, 10)) {
+				fprintf(stderr, "Nat: Illegal \"index\"\n");
+				return -1;
+			}
+			argc--;
+			argv++;
+		}
+	}
+
+	tail = addattr_nest(n, MAX_MSG, tca_id);
+	addattr_l(n, MAX_MSG, TCA_NAT_PARMS, &sel, sizeof(sel));
+	addattr_nest_end(n, tail);
+
+	*argc_p = argc;
+	*argv_p = argv;
+	return 0;
+}
+
+static int
+print_nat(struct action_util *au, FILE * f, struct rtattr *arg)
+{
+	struct tc_nat *sel;
+	struct rtattr *tb[TCA_NAT_MAX + 1];
+	SPRINT_BUF(buf1);
+	SPRINT_BUF(buf2);
+	int len;
+
+	print_string(PRINT_ANY, "type", " %s ", "nat");
+	if (arg == NULL)
+		return 0;
+
+	parse_rtattr_nested(tb, TCA_NAT_MAX, arg);
+
+	if (tb[TCA_NAT_PARMS] == NULL) {
+		fprintf(stderr, "Missing nat parameters\n");
+		return -1;
+	}
+	sel = RTA_DATA(tb[TCA_NAT_PARMS]);
+
+	len = ffs(sel->mask);
+	len = len ? 33 - len : 0;
+
+	print_string(PRINT_ANY, "direction", "%s",
+		     sel->flags & TCA_NAT_FLAG_EGRESS ? "egress" : "ingress");
+
+	snprintf(buf2, sizeof(buf2), "%s/%d",
+		 format_host_r(AF_INET, 4, &sel->old_addr, buf1, sizeof(buf1)),
+		 len);
+	print_string(PRINT_ANY, "old_addr", " %s", buf2);
+	print_string(PRINT_ANY, "new_addr", " %s",
+		     format_host_r(AF_INET, 4, &sel->new_addr, buf1, sizeof(buf1)));
+
+	print_action_control(f, " ", sel->action, "");
+	print_nl();
+	print_uint(PRINT_ANY, "index", "\t index %u", sel->index);
+	print_int(PRINT_ANY, "ref", " ref %d", sel->refcnt);
+	print_int(PRINT_ANY, "bind", " bind %d", sel->bindcnt);
+
+	if (show_stats) {
+		if (tb[TCA_NAT_TM]) {
+			struct tcf_t *tm = RTA_DATA(tb[TCA_NAT_TM]);
+
+			print_tm(f, tm);
+		}
+	}
+
+	print_nl();
+
+	return 0;
+}
+
+struct action_util nat_action_util = {
+	.id = "nat",
+	.parse_aopt = parse_nat,
+	.print_aopt = print_nat,
+};