X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=tc%2Fm_ipt.c;fp=tc%2Fm_ipt.c;h=518e4a3cebb47ce379bbf1623e1c4fdf60f92725;hb=4f7d3057911ebc5df78113896cb02e1b4ffbfabe;hp=0000000000000000000000000000000000000000;hpb=8a59994861a17eb92c11553d88631757ee8e63c3;p=iproute2.git

diff --git a/tc/m_ipt.c b/tc/m_ipt.c
new file mode 100644
index 0000000..518e4a3
--- /dev/null
+++ b/tc/m_ipt.c
@@ -0,0 +1,599 @@
+/*
+ * m_ipt.c	iptables 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) 
+ * 
+ * TODO: bad bad hardcoding IPT_LIB_DIR and PROC_SYS_MODPROBE
+ *
+*/
+
+#include <syslog.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_tables.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 <limits.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/wait.h>
+
+const char *pname = "tc-ipt";
+const char *tname = "mangle";
+const char *pversion = "0.1";
+
+#ifndef TRUE
+#define TRUE 1
+#endif
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+#ifndef IPT_LIB_DIR
+#define IPT_LIB_DIR "/usr/local/lib/iptables"
+#endif
+
+#ifndef PROC_SYS_MODPROBE
+#define PROC_SYS_MODPROBE "/proc/sys/kernel/modprobe"
+#endif
+
+static const char *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[] = {
+	{"jump", 1, 0, 'j'},
+	{0, 0, 0, 0}
+};
+
+static struct iptables_target *t_list = NULL;
+static unsigned int global_option_offset = 0;
+#define OPTION_OFFSET 256
+
+
+void
+register_target(struct iptables_target *me)
+{
+/*      fprintf(stderr, "\nDummy register_target %s \n", me->name);
+*/
+	me->next = t_list;
+	t_list = me;
+
+}
+
+void
+exit_tryhelp(int status)
+{
+	fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n",
+		pname, pname);
+	exit(status);
+}
+
+void
+exit_error(enum exittype status, char *msg, ...)
+{
+	va_list args;
+
+	va_start(args, msg);
+	fprintf(stderr, "%s v%s: ", pname, pversion);
+	vfprintf(stderr, msg, args);
+	va_end(args);
+	fprintf(stderr, "\n");
+	if (status == PARAMETER_PROBLEM)
+		exit_tryhelp(status);
+	if (status == VERSION_PROBLEM)
+		fprintf(stderr,
+			"Perhaps iptables or your kernel needs to be upgraded.\n");
+	exit(status);
+}
+
+/* stolen from iptables 1.2.11
+They should really have them as a library so i can link to them
+Email them next time i remember
+*/
+
+char *
+addr_to_dotted(const struct in_addr *addrp)
+{
+	static char buf[20];
+	const unsigned char *bytep;
+
+	bytep = (const unsigned char *) &(addrp->s_addr);
+	sprintf(buf, "%d.%d.%d.%d", bytep[0], bytep[1], bytep[2], bytep[3]);
+	return buf;
+}
+
+int string_to_number_ll(const char *s, unsigned long long min, 
+			unsigned long long max,
+		 unsigned long long *ret)
+{
+	unsigned long long number;
+	char *end;
+
+	/* Handle hex, octal, etc. */
+	errno = 0;
+	number = strtoull(s, &end, 0);
+	if (*end == '\0' && end != s) {
+		/* we parsed a number, let's see if we want this */
+		if (errno != ERANGE && min <= number && (!max || number <= max)) {
+			*ret = number;
+			return 0;
+		}
+	}
+	return -1;
+}
+
+int string_to_number_l(const char *s, unsigned long min, unsigned long max,
+		       unsigned long *ret)
+{
+	int result;
+	unsigned long long number;
+
+	result = string_to_number_ll(s, min, max, &number);
+	*ret = (unsigned long)number;
+
+	return result;
+}
+
+int string_to_number(const char *s, unsigned int min, unsigned int max,
+		unsigned int *ret)
+{
+	int result;
+	unsigned long number;
+
+	result = string_to_number_l(s, min, max, &number);
+	*ret = (unsigned int)number;
+
+	return result;
+}
+
+static struct option *
+copy_options(struct option *oldopts)
+{
+	struct option *merge;
+	unsigned int num_old;
+	for (num_old = 0; oldopts[num_old].name; num_old++) ;
+	merge = malloc(sizeof (struct option) * (num_old + 1));
+	if (NULL == merge)
+		return NULL;
+	memcpy(merge, oldopts, num_old * sizeof (struct option));
+	memset(merge + num_old, 0, sizeof (struct option));
+	return merge;
+}
+
+static struct option *
+merge_options(struct option *oldopts, const struct option *newopts,
+	      unsigned int *option_offset)
+{
+	struct option *merge;
+	unsigned int num_old, num_new, i;
+
+	for (num_old = 0; oldopts[num_old].name; num_old++) ;
+	for (num_new = 0; newopts[num_new].name; num_new++) ;
+
+	*option_offset = global_option_offset + OPTION_OFFSET;
+
+	merge = malloc(sizeof (struct option) * (num_new + num_old + 1));
+	memcpy(merge, oldopts, num_old * sizeof (struct option));
+	for (i = 0; i < num_new; i++) {
+		merge[num_old + i] = newopts[i];
+		merge[num_old + i].val += *option_offset;
+	}
+	memset(merge + num_old + num_new, 0, sizeof (struct option));
+
+	return merge;
+}
+
+static void *
+fw_calloc(size_t count, size_t size)
+{
+	void *p;
+
+	if ((p = (void *) calloc(count, size)) == NULL) {
+		perror("iptables: calloc failed");
+		exit(1);
+	}
+	return p;
+}
+
+static struct iptables_target *
+find_t(char *name)
+{
+	struct iptables_target *m;
+	for (m = t_list; m; m = m->next) {
+		if (strcmp(m->name, name) == 0)
+			return m;
+	}
+
+	return NULL;
+}
+
+static struct iptables_target *
+get_target_name(char *name)
+{
+	void *handle;
+	char *error;
+	char *new_name, *lname;
+	struct iptables_target *m;
+
+	char path[sizeof (IPT_LIB_DIR) + sizeof ("/libipt_.so") + strlen(name)];
+
+	new_name = malloc(strlen(name) + 1);
+	lname = malloc(strlen(name) + 1);
+	if (new_name)
+		memset(new_name, '\0', strlen(name) + 1);
+	else
+		exit_error(PARAMETER_PROBLEM, "get_target_name");
+
+	if (lname)
+		memset(lname, '\0', strlen(name) + 1);
+	else
+		exit_error(PARAMETER_PROBLEM, "get_target_name");
+
+	strcpy(new_name, name);
+	strcpy(lname, name);
+
+	if (isupper(lname[0])) {
+		int i;
+		for (i = 0; i < strlen(name); i++) {
+			lname[i] = tolower(lname[i]);
+		}
+	}
+
+	if (islower(new_name[0])) {
+		int i;
+		for (i = 0; i < strlen(new_name); i++) {
+			new_name[i] = toupper(new_name[i]);
+		}
+	}
+
+	sprintf(path, IPT_LIB_DIR "/libipt_%s.so", new_name);
+	handle = dlopen(path, RTLD_LAZY);
+	if (!handle) {
+		sprintf(path, IPT_LIB_DIR "/libipt_%s.so", lname);
+		handle = dlopen(path, RTLD_LAZY);
+		if (!handle) {
+			fputs(dlerror(), stderr);
+			printf("\n");
+			return NULL;
+		}
+	}
+
+	m = dlsym(handle, new_name);
+	if ((error = dlerror()) != NULL) {
+		m = (struct iptables_target *) dlsym(handle, lname);
+		if ((error = dlerror()) != NULL) {
+			m = find_t(new_name);
+			if (NULL == m) {
+				m = find_t(lname);
+				if (NULL == m) {
+					fputs(error, stderr);
+					fprintf(stderr, "\n");
+					dlclose(handle);
+					return NULL;
+				}
+			}
+		}
+	}
+
+	return m;
+}
+
+
+struct in_addr *dotted_to_addr(const char *dotted)
+{
+	static struct in_addr addr;
+	unsigned char *addrp;
+	char *p, *q;
+	unsigned int onebyte;
+	int i;
+	char buf[20];
+
+	/* copy dotted string, because we need to modify it */
+	strncpy(buf, dotted, sizeof (buf) - 1);
+	addrp = (unsigned char *) &(addr.s_addr);
+
+	p = buf;
+	for (i = 0; i < 3; i++) {
+		if ((q = strchr(p, '.')) == NULL)
+			return (struct in_addr *) NULL;
+
+		*q = '\0';
+		if (string_to_number(p, 0, 255, &onebyte) == -1)
+			return (struct in_addr *) NULL;
+
+		addrp[i] = (unsigned char) onebyte;
+		p = q + 1;
+	}
+
+	/* we've checked 3 bytes, now we check the last one */
+	if (string_to_number(p, 0, 255, &onebyte) == -1)
+		return (struct in_addr *) NULL;
+
+	addrp[3] = (unsigned char) onebyte;
+
+	return &addr;
+}
+
+int
+build_st(struct iptables_target *target, struct ipt_entry_target *t)
+{
+	unsigned int nfcache = 0;
+
+	if (target) {
+		size_t size;
+
+		size =
+		    IPT_ALIGN(sizeof (struct ipt_entry_target)) + target->size;
+
+		if (NULL == t) {
+			target->t = fw_calloc(1, size);
+			target->init(target->t, &nfcache);
+			target->t->u.target_size = size;
+		} else {
+			target->t = t;
+		}
+		strcpy(target->t->u.user.name, target->name);
+		return 0;
+	}
+
+	return -1;
+}
+
+static int parse_ipt(struct action_util *a,int *argc_p, 
+		     char ***argv_p, int tca_id, struct nlmsghdr *n)
+{
+	struct iptables_target *m = NULL;
+	struct ipt_entry fw;
+	struct rtattr *tail;
+	int c;
+	int rargc = *argc_p;
+	char **argv = *argv_p;
+	struct option *opts;
+	int argc = 0, iargc = 0;
+	char k[16];
+	int res = -1;
+	int size = 0;
+	int iok = 0, ok = 0;
+	__u32 hook = 0, index = 0;
+	res = 0;
+
+	{
+		int i;
+		for (i = 0; i < rargc; i++) {
+			if (NULL == argv[i] || 0 == strcmp(argv[i], "action")) {
+				break;
+			}
+		}
+		iargc = argc = i;
+	}
+
+	if (argc <= 2) {
+		fprintf(stderr,"bad arguements to ipt %d vs %d \n", argc, rargc);
+		return -1;
+	}
+
+	opts = copy_options(original_opts);
+
+	if (NULL == opts)
+		return -1;
+
+	while (1) {
+		c = getopt_long(argc, argv, "j:", opts, NULL);
+		if (c == -1)
+			break;
+		switch (c) {
+		case 'j':
+			m = get_target_name(optarg);
+			if (NULL != m) {
+
+				if (0 > build_st(m, NULL)) {
+					printf(" %s error \n", m->name);
+					return -1;
+				}
+				opts =
+				    merge_options(opts, m->extra_opts,
+						  &m->option_offset);
+			} else {
+				fprintf(stderr," failed to find target %s\n\n", optarg);
+				return -1;
+			}
+			ok++;
+			break;
+
+		default:
+			memset(&fw, 0, sizeof (fw));
+			if (m) {
+				unsigned int fake_flags = 0;
+				m->parse(c - m->option_offset, argv, 0,
+					 &fake_flags, NULL, &m->t);
+			} else {
+				fprintf(stderr," failed to find target %s\n\n", optarg);
+				return -1;
+
+			}
+			ok++;
+
+			/*m->final_check(m->t); -- Is this necessary?
+			** useful when theres depencies
+			** eg ipt_TCPMSS.c has have the TCP match loaded
+			** before this can be used;
+			**  also seems the ECN target needs it 
+			*/
+
+			break;
+
+		}
+	}
+
+	if (iargc > optind) {
+		if (matches(argv[optind], "index") == 0) {
+			if (get_u32(&index, argv[optind + 1], 10)) {
+				fprintf(stderr, "Illegal \"index\"\n");
+				return -1;
+			}
+			iok++;
+
+			optind += 2;
+		}
+	}
+
+	if (!ok && !iok) {
+		fprintf(stderr," ipt Parser BAD!! (%s)\n", *argv);
+		return -1;
+	}
+
+	{
+		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 = NLMSG_TAIL(n);
+	addattr_l(n, MAX_MSG, tca_id, NULL, 0);
+	fprintf(stdout, "tablename: %s hook: %s\n ", tname, ipthooks[hook]);
+	fprintf(stdout, "\ttarget: ");
+
+	if (m)
+		m->print(NULL, m->t, 0);
+	fprintf(stdout, " index %d\n", index);
+
+	if (strlen(tname) > 16) {
+		size = 16;
+		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);
+	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
+
+	argc -= optind;
+	argv += optind;
+	*argc_p = rargc - iargc;
+	*argv_p = argv;
+	
+	optind = 1;
+
+	return 0;
+
+}
+
+static int
+print_ipt(struct action_util *au,FILE * f, struct rtattr *arg)
+{
+	struct rtattr *tb[TCA_IPT_MAX + 1];
+	struct ipt_entry_target *t = NULL;
+	struct option *opts;
+
+	if (arg == NULL)
+		return -1;
+
+	opts = copy_options(original_opts);
+
+	if (NULL == opts)
+		return -1;
+
+	parse_rtattr_nested(tb, TCA_IPT_MAX, arg);
+
+	if (tb[TCA_IPT_TABLE] == NULL) {
+		fprintf(f, "[NULL ipt table name ] assuming mangle ");
+	} else {
+		fprintf(f, "tablename: %s ",
+			(char *) RTA_DATA(tb[TCA_IPT_TABLE]));
+	}
+
+	if (tb[TCA_IPT_HOOK] == NULL) {
+		fprintf(f, "[NULL ipt hook name ]\n ");
+		return -1;
+	} else {
+		__u32 hook;
+		hook = *(__u32 *) RTA_DATA(tb[TCA_IPT_HOOK]);
+		fprintf(f, " hook: %s \n", ipthooks[hook]);
+	}
+
+	if (tb[TCA_IPT_TARG] == NULL) {
+		fprintf(f, "\t[NULL ipt target parameters ] \n");
+		return -1;
+	} else {
+		struct iptables_target *m = NULL;
+		t = RTA_DATA(tb[TCA_IPT_TARG]);
+		m = get_target_name(t->u.user.name);
+		if (NULL != m) {
+			if (0 > build_st(m, t)) {
+				fprintf(stderr, " %s error \n", m->name);
+				return -1;
+			}
+
+			opts =
+			    merge_options(opts, m->extra_opts,
+					  &m->option_offset);
+		} else {
+			fprintf(stderr, " failed to find 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 = *(__u32 *) RTA_DATA(tb[TCA_IPT_INDEX]);
+			fprintf(f, " \n\tindex %d", 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);
+			}
+		} 
+		fprintf(f, " \n");
+
+	}
+
+	return 0;
+}
+
+struct action_util ipt_action_util = {
+        .id = "ipt",
+        .parse_aopt = parse_ipt,
+        .print_aopt = print_ipt,
+};
+