Adding upstream version 6.1.0.upstream/6.1.0upstream

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

1 files changed, 405 insertions, 0 deletions

diff --git a/tc/m_xt.c b/tc/m_xt.c
new file mode 100644
index 0000000..deaf96a
--- /dev/null
+++ b/tc/m_xt.c
@@ -0,0 +1,405 @@
+/*
+ * m_xt.c	xtables based targets
+ *		utilities mostly ripped from iptables <duh, its the linux way>
+ *
+ *		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:  J Hadi Salim (hadi@cyberus.ca)
+ */
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <net/if.h>
+#include <limits.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <xtables.h>
+#include "utils.h"
+#include "tc_util.h"
+#include <linux/tc_act/tc_ipt.h>
+#include <stdio.h>
+#include <dlfcn.h>
+#include <getopt.h>
+#include <errno.h>
+#include <string.h>
+#include <netdb.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/wait.h>
+#ifndef XT_LIB_DIR
+#       define XT_LIB_DIR "/lib/xtables"
+#endif
+
+#ifndef __ALIGN_KERNEL
+#define __ALIGN_KERNEL(x, a)	\
+	__ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1)
+#define __ALIGN_KERNEL_MASK(x, mask) \
+	(((x) + (mask)) & ~(mask))
+#endif
+
+#ifndef ALIGN
+#define ALIGN(x, a)	__ALIGN_KERNEL((x), (a))
+#endif
+
+static const char *tname = "mangle";
+
+char *lib_dir;
+
+static const char * const ipthooks[] = {
+	"NF_IP_PRE_ROUTING",
+	"NF_IP_LOCAL_IN",
+	"NF_IP_FORWARD",
+	"NF_IP_LOCAL_OUT",
+	"NF_IP_POST_ROUTING",
+};
+
+static struct option original_opts[] = {
+	{
+		.name = "jump",
+		.has_arg = 1,
+		.val = 'j'
+	},
+	{0, 0, 0, 0}
+};
+
+static struct xtables_globals tcipt_globals = {
+	.option_offset = 0,
+	.program_name = "tc-ipt",
+	.program_version = "0.2",
+	.orig_opts = original_opts,
+	.opts = original_opts,
+	.exit_err = NULL,
+#if XTABLES_VERSION_CODE >= 11
+	.compat_rev = xtables_compatible_revision,
+#endif
+};
+
+/*
+ * we may need to check for version mismatch
+*/
+static int
+build_st(struct xtables_target *target, struct xt_entry_target *t)
+{
+
+	size_t size =
+		    XT_ALIGN(sizeof(struct xt_entry_target)) + target->size;
+
+	if (t == NULL) {
+		target->t = xtables_calloc(1, size);
+		target->t->u.target_size = size;
+		strncpy(target->t->u.user.name, target->name,
+			sizeof(target->t->u.user.name) - 1);
+		target->t->u.user.revision = target->revision;
+
+		if (target->init != NULL)
+			target->init(target->t);
+	} else {
+		target->t = t;
+	}
+	return 0;
+
+}
+
+static void set_lib_dir(void)
+{
+
+	lib_dir = getenv("XTABLES_LIBDIR");
+	if (!lib_dir) {
+		lib_dir = getenv("IPTABLES_LIB_DIR");
+		if (lib_dir)
+			fprintf(stderr, "using deprecated IPTABLES_LIB_DIR\n");
+	}
+	if (lib_dir == NULL)
+		lib_dir = XT_LIB_DIR;
+
+}
+
+static int get_xtables_target_opts(struct xtables_globals *globals,
+				   struct xtables_target *m)
+{
+	struct option *opts;
+
+#if XTABLES_VERSION_CODE >= 6
+	opts = xtables_options_xfrm(globals->orig_opts,
+				    globals->opts,
+				    m->x6_options,
+				    &m->option_offset);
+#else
+	opts = xtables_merge_options(globals->opts,
+				     m->extra_opts,
+				     &m->option_offset);
+#endif
+	if (!opts)
+		return -1;
+	globals->opts = opts;
+	return 0;
+}
+
+static int parse_ipt(struct action_util *a, int *argc_p,
+		     char ***argv_p, int tca_id, struct nlmsghdr *n)
+{
+	struct xtables_target *m = NULL;
+#if XTABLES_VERSION_CODE >= 6
+	struct ipt_entry fw = {};
+#endif
+	struct rtattr *tail;
+
+	int c;
+	char **argv = *argv_p;
+	int argc;
+	char k[FILTER_NAMESZ];
+	int size = 0;
+	int iok = 0, ok = 0;
+	__u32 hook = 0, index = 0;
+
+	/* copy tcipt_globals because .opts will be modified by iptables */
+	struct xtables_globals tmp_tcipt_globals = tcipt_globals;
+
+	xtables_init_all(&tmp_tcipt_globals, NFPROTO_IPV4);
+	set_lib_dir();
+
+	/* parse only up until the next action */
+	for (argc = 0; argc < *argc_p; argc++) {
+		if (!argv[argc] || !strcmp(argv[argc], "action"))
+			break;
+	}
+
+	if (argc <= 2) {
+		fprintf(stderr,
+			"too few arguments for xt, need at least '-j <target>'\n");
+		return -1;
+	}
+
+	while (1) {
+		c = getopt_long(argc, argv, "j:", tmp_tcipt_globals.opts, NULL);
+		if (c == -1)
+			break;
+		switch (c) {
+		case 'j':
+			m = xtables_find_target(optarg, XTF_TRY_LOAD);
+			if (!m) {
+				fprintf(stderr,
+					" failed to find target %s\n\n",
+					optarg);
+				return -1;
+			}
+
+			if (build_st(m, NULL) < 0) {
+				printf(" %s error\n", m->name);
+				return -1;
+			}
+
+			if (get_xtables_target_opts(&tmp_tcipt_globals,
+						    m) < 0) {
+				fprintf(stderr,
+					" failed to find additional options for target %s\n\n",
+					optarg);
+				return -1;
+			}
+			ok++;
+			break;
+
+		default:
+#if XTABLES_VERSION_CODE >= 6
+			if (m != NULL && m->x6_parse != NULL) {
+				xtables_option_tpcall(c, argv, 0, m, &fw);
+#else
+			if (m != NULL && m->parse != NULL) {
+				m->parse(c - m->option_offset, argv, 0,
+					 &m->tflags, NULL, &m->t);
+#endif
+			} else {
+				fprintf(stderr,
+					"failed to find target %s\n\n", optarg);
+				return -1;
+
+			}
+			ok++;
+			break;
+		}
+	}
+
+	if (argc > optind) {
+		if (matches(argv[optind], "index") == 0) {
+			if (get_u32(&index, argv[optind + 1], 10)) {
+				fprintf(stderr, "Illegal \"index\"\n");
+				xtables_free_opts(1);
+				return -1;
+			}
+			iok++;
+
+			optind += 2;
+		}
+	}
+
+	if (!ok && !iok) {
+		fprintf(stderr, " ipt Parser BAD!! (%s)\n", *argv);
+		return -1;
+	}
+
+	/* check that we passed the correct parameters to the target */
+#if XTABLES_VERSION_CODE >= 6
+	if (m)
+		xtables_option_tfcall(m);
+#else
+	if (m && m->final_check)
+		m->final_check(m->tflags);
+#endif
+
+	{
+		struct tcmsg *t = NLMSG_DATA(n);
+
+		if (t->tcm_parent != TC_H_ROOT
+		    && t->tcm_parent == TC_H_MAJ(TC_H_INGRESS)) {
+			hook = NF_IP_PRE_ROUTING;
+		} else {
+			hook = NF_IP_POST_ROUTING;
+		}
+	}
+
+	tail = addattr_nest(n, MAX_MSG, tca_id);
+	fprintf(stdout, "tablename: %s hook: %s\n ", tname, ipthooks[hook]);
+	fprintf(stdout, "\ttarget: ");
+
+	if (m) {
+		if (m->print)
+			m->print(NULL, m->t, 0);
+		else
+			printf("%s ", m->name);
+	}
+	fprintf(stdout, " index %d\n", index);
+
+	if (strlen(tname) >= 16) {
+		size = 15;
+		k[15] = 0;
+	} else {
+		size = 1 + strlen(tname);
+	}
+	strncpy(k, tname, size);
+
+	addattr_l(n, MAX_MSG, TCA_IPT_TABLE, k, size);
+	addattr_l(n, MAX_MSG, TCA_IPT_HOOK, &hook, 4);
+	addattr_l(n, MAX_MSG, TCA_IPT_INDEX, &index, 4);
+	if (m)
+		addattr_l(n, MAX_MSG, TCA_IPT_TARG, m->t, m->t->u.target_size);
+	addattr_nest_end(n, tail);
+
+	argv += optind;
+	*argc_p -= argc;
+	*argv_p = argv;
+
+	optind = 0;
+	xtables_free_opts(1);
+
+	if (m) {
+		/* Clear flags if target will be used again */
+		m->tflags = 0;
+		m->used = 0;
+		/* Free allocated memory */
+		if (m->t)
+			free(m->t);
+	}
+
+	return 0;
+
+}
+
+static int
+print_ipt(struct action_util *au, FILE *f, struct rtattr *arg)
+{
+	struct xtables_target *m;
+	struct rtattr *tb[TCA_IPT_MAX + 1];
+	struct xt_entry_target *t = NULL;
+	__u32 hook;
+
+	if (arg == NULL)
+		return 0;
+
+	/* copy tcipt_globals because .opts will be modified by iptables */
+	struct xtables_globals tmp_tcipt_globals = tcipt_globals;
+
+	xtables_init_all(&tmp_tcipt_globals, NFPROTO_IPV4);
+	set_lib_dir();
+
+	parse_rtattr_nested(tb, TCA_IPT_MAX, arg);
+
+	if (tb[TCA_IPT_TABLE] == NULL) {
+		fprintf(stderr, "Missing ipt table name, assuming mangle\n");
+	} else {
+		fprintf(f, "tablename: %s ",
+			rta_getattr_str(tb[TCA_IPT_TABLE]));
+	}
+
+	if (tb[TCA_IPT_HOOK] == NULL) {
+		fprintf(stderr, "Missing ipt hook name\n ");
+		return -1;
+	}
+
+	if (tb[TCA_IPT_TARG] == NULL) {
+		fprintf(stderr, "Missing ipt target parameters\n");
+		return -1;
+	}
+
+	hook = rta_getattr_u32(tb[TCA_IPT_HOOK]);
+	fprintf(f, " hook: %s\n", ipthooks[hook]);
+
+	t = RTA_DATA(tb[TCA_IPT_TARG]);
+	m = xtables_find_target(t->u.user.name, XTF_TRY_LOAD);
+	if (!m) {
+		fprintf(stderr, " failed to find target %s\n\n",
+			t->u.user.name);
+		return -1;
+	}
+	if (build_st(m, t) < 0) {
+		fprintf(stderr, " %s error\n", m->name);
+		return -1;
+	}
+
+	if (get_xtables_target_opts(&tmp_tcipt_globals, m) < 0) {
+		fprintf(stderr,
+			" failed to find additional options for target %s\n\n",
+			t->u.user.name);
+		return -1;
+	}
+	fprintf(f, "\ttarget ");
+	m->print(NULL, m->t, 0);
+	if (tb[TCA_IPT_INDEX] == NULL) {
+		fprintf(f, " [NULL ipt target index ]\n");
+	} else {
+		__u32 index;
+
+		index = rta_getattr_u32(tb[TCA_IPT_INDEX]);
+		fprintf(f, "\n\tindex %u", index);
+	}
+
+	if (tb[TCA_IPT_CNT]) {
+		struct tc_cnt *c  = RTA_DATA(tb[TCA_IPT_CNT]);
+
+		fprintf(f, " ref %d bind %d", c->refcnt, c->bindcnt);
+	}
+	if (show_stats) {
+		if (tb[TCA_IPT_TM]) {
+			struct tcf_t *tm = RTA_DATA(tb[TCA_IPT_TM]);
+
+			print_tm(f, tm);
+		}
+	}
+	print_nl();
+
+	xtables_free_opts(1);
+
+	return 0;
+}
+
+struct action_util xt_action_util = {
+	.id = "xt",
+	.parse_aopt = parse_ipt,
+	.print_aopt = print_ipt,
+};