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-rw-r--r--tc/m_ipt.c516
1 files changed, 516 insertions, 0 deletions
diff --git a/tc/m_ipt.c b/tc/m_ipt.c
new file mode 100644
index 0000000..046b310
--- /dev/null
+++ b/tc/m_ipt.c
@@ -0,0 +1,516 @@
+/*
+ * 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)
+ */
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <iptables.h>
+#include <linux/netfilter.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 <unistd.h>
+#include <fcntl.h>
+#include <sys/wait.h>
+
+static const char *pname = "tc-ipt";
+static const char *tname = "mangle";
+static const char *pversion = "0.1";
+
+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 xtables_target *t_list;
+static struct option *opts = original_opts;
+static unsigned int global_option_offset;
+#define OPTION_OFFSET 256
+
+char *lib_dir;
+
+void
+xtables_register_target(struct xtables_target *me)
+{
+ me->next = t_list;
+ t_list = me;
+
+}
+
+static void exit_tryhelp(int status)
+{
+ fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n",
+ pname, pname);
+ exit(status);
+}
+
+static void exit_error(enum xtables_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
+*/
+
+static void free_opts(struct option *local_opts)
+{
+ if (local_opts != original_opts) {
+ free(local_opts);
+ opts = original_opts;
+ global_option_offset = 0;
+ }
+}
+
+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 xtables_target *
+find_t(char *name)
+{
+ struct xtables_target *m;
+
+ for (m = t_list; m; m = m->next) {
+ if (strcmp(m->name, name) == 0)
+ return m;
+ }
+
+ return NULL;
+}
+
+static struct xtables_target *
+get_target_name(const char *name)
+{
+ void *handle;
+ char *error;
+ char *new_name, *lname;
+ struct xtables_target *m;
+ char path[strlen(lib_dir) + sizeof("/libipt_.so") + strlen(name)];
+
+#ifdef NO_SHARED_LIBS
+ return NULL;
+#endif
+
+ new_name = calloc(1, strlen(name) + 1);
+ lname = calloc(1, strlen(name) + 1);
+ if (!new_name)
+ exit_error(PARAMETER_PROBLEM, "get_target_name");
+ if (!lname)
+ 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]);
+ }
+ }
+
+ /* try libxt_xx first */
+ sprintf(path, "%s/libxt_%s.so", lib_dir, new_name);
+ handle = dlopen(path, RTLD_LAZY);
+ if (!handle) {
+ /* try libipt_xx next */
+ sprintf(path, "%s/libipt_%s.so", lib_dir, new_name);
+ handle = dlopen(path, RTLD_LAZY);
+
+ if (!handle) {
+ sprintf(path, "%s/libxt_%s.so", lib_dir, lname);
+ handle = dlopen(path, RTLD_LAZY);
+ }
+
+ if (!handle) {
+ sprintf(path, "%s/libipt_%s.so", lib_dir, lname);
+ handle = dlopen(path, RTLD_LAZY);
+ }
+ /* ok, lets give up .. */
+ if (!handle) {
+ fputs(dlerror(), stderr);
+ printf("\n");
+ free(new_name);
+ free(lname);
+ return NULL;
+ }
+ }
+
+ m = dlsym(handle, new_name);
+ if ((error = dlerror()) != NULL) {
+ m = (struct xtables_target *) dlsym(handle, lname);
+ if ((error = dlerror()) != NULL) {
+ m = find_t(new_name);
+ if (m == NULL) {
+ m = find_t(lname);
+ if (m == NULL) {
+ fputs(error, stderr);
+ fprintf(stderr, "\n");
+ dlclose(handle);
+ free(new_name);
+ free(lname);
+ return NULL;
+ }
+ }
+ }
+ }
+
+ free(new_name);
+ free(lname);
+ return m;
+}
+
+static void set_revision(char *name, u_int8_t revision)
+{
+ /* Old kernel sources don't have ".revision" field,
+ * but we stole a byte from name. */
+ name[IPT_FUNCTION_MAXNAMELEN - 2] = '\0';
+ name[IPT_FUNCTION_MAXNAMELEN - 1] = revision;
+}
+
+/*
+ * we may need to check for version mismatch
+*/
+static int build_st(struct xtables_target *target, struct ipt_entry_target *t)
+{
+ if (target) {
+ size_t size;
+
+ size =
+ XT_ALIGN(sizeof(struct ipt_entry_target)) + target->size;
+
+ if (t == NULL) {
+ target->t = fw_calloc(1, size);
+ target->t->u.target_size = size;
+
+ if (target->init != NULL)
+ target->init(target->t);
+ set_revision(target->t->u.user.name, target->revision);
+ } 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 xtables_target *m = NULL;
+ struct ipt_entry fw;
+ struct rtattr *tail;
+ int c;
+ int rargc = *argc_p;
+ char **argv = *argv_p;
+ int argc = 0, iargc = 0;
+ char k[FILTER_NAMESZ];
+ int size = 0;
+ int iok = 0, ok = 0;
+ __u32 hook = 0, index = 0;
+
+ lib_dir = getenv("IPTABLES_LIB_DIR");
+ if (!lib_dir)
+ lib_dir = IPT_LIB_DIR;
+
+ {
+ int i;
+
+ for (i = 0; i < rargc; i++) {
+ if (!argv[i] || strcmp(argv[i], "action") == 0)
+ break;
+ }
+ iargc = argc = i;
+ }
+
+ if (argc <= 2) {
+ fprintf(stderr, "bad arguments to ipt %d vs %d\n", argc, rargc);
+ 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 (m != NULL) {
+
+ if (build_st(m, NULL) < 0) {
+ 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) {
+ m->parse(c - m->option_offset, argv, 0,
+ &m->tflags, NULL, &m->t);
+ } else {
+ fprintf(stderr, " failed to find target %s\n\n", optarg);
+ return -1;
+
+ }
+ ok++;
+ break;
+
+ }
+ }
+
+ if (iargc > optind) {
+ if (matches(argv[optind], "index") == 0) {
+ if (get_u32(&index, argv[optind + 1], 10)) {
+ fprintf(stderr, "Illegal \"index\"\n");
+ free_opts(opts);
+ 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 (m)
+ m->final_check(m->tflags);
+
+ {
+ 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)
+ 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);
+ addattr_nest_end(n, tail);
+
+ argc -= optind;
+ argv += optind;
+ *argc_p = rargc - iargc;
+ *argv_p = argv;
+
+ optind = 0;
+ free_opts(opts);
+ /* 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 rtattr *tb[TCA_IPT_MAX + 1];
+ struct ipt_entry_target *t = NULL;
+ struct xtables_target *m;
+ __u32 hook;
+
+ if (arg == NULL)
+ return 0;
+
+ lib_dir = getenv("IPTABLES_LIB_DIR");
+ if (!lib_dir)
+ lib_dir = IPT_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;
+ }
+
+ hook = rta_getattr_u32(tb[TCA_IPT_HOOK]);
+ fprintf(f, " hook: %s\n", ipthooks[hook]);
+
+ if (tb[TCA_IPT_TARG] == NULL) {
+ fprintf(stderr, "Missing ipt target parameters\n");
+ return -1;
+ }
+
+
+ t = RTA_DATA(tb[TCA_IPT_TARG]);
+ m = get_target_name(t->u.user.name);
+ if (m != NULL) {
+ if (build_st(m, t) < 0) {
+ 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(stderr, "Missing 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);
+ }
+ }
+ fprintf(f, "\n");
+
+ free_opts(opts);
+
+ return 0;
+}
+
+struct action_util ipt_action_util = {
+ .id = "ipt",
+ .parse_aopt = parse_ipt,
+ .print_aopt = print_ipt,
+};
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