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443 lines
9.2 KiB
443 lines
9.2 KiB
/*
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* m_xt.c xtables based targets
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* utilities mostly ripped from iptables <duh, its the linux way>
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*
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* This program is free software; you can distribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: J Hadi Salim (hadi@cyberus.ca)
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*/
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/*XXX: in the future (xtables 1.4.3?) get rid of everything tagged
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* as TC_CONFIG_XT_H */
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#include <syslog.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <net/if.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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#include <xtables.h>
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#include "utils.h"
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#include "tc_util.h"
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#include <linux/tc_act/tc_ipt.h>
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#include <stdio.h>
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#include <getopt.h>
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#include <errno.h>
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#include <string.h>
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#include <netdb.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <stdarg.h>
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#include <limits.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/wait.h>
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#ifdef TC_CONFIG_XT_H
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#include "xt-internal.h"
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#endif
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#ifndef ALIGN
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#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1)
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#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask))
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#endif
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static const char *pname = "tc-ipt";
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static const char *tname = "mangle";
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static const char *pversion = "0.2";
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static const char *ipthooks[] = {
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"NF_IP_PRE_ROUTING",
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"NF_IP_LOCAL_IN",
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"NF_IP_FORWARD",
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"NF_IP_LOCAL_OUT",
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"NF_IP_POST_ROUTING",
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};
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static struct option original_opts[] = {
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{"jump", 1, 0, 'j'},
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{0, 0, 0, 0}
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};
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static struct option *opts = original_opts;
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static unsigned int global_option_offset;
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char *lib_dir;
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const char *program_version = XTABLES_VERSION;
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const char *program_name = "tc-ipt";
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struct afinfo afinfo = {
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.family = AF_INET,
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.libprefix = "libxt_",
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.ipproto = IPPROTO_IP,
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.kmod = "ip_tables",
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.so_rev_target = IPT_SO_GET_REVISION_TARGET,
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};
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#define OPTION_OFFSET 256
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/*XXX: TC_CONFIG_XT_H */
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static void free_opts(struct option *local_opts)
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{
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if (local_opts != original_opts) {
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free(local_opts);
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opts = original_opts;
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global_option_offset = 0;
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}
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}
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/*XXX: TC_CONFIG_XT_H */
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static struct option *
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merge_options(struct option *oldopts, const struct option *newopts,
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unsigned int *option_offset)
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{
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struct option *merge;
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unsigned int num_old, num_new, i;
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for (num_old = 0; oldopts[num_old].name; num_old++);
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for (num_new = 0; newopts[num_new].name; num_new++);
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*option_offset = global_option_offset + OPTION_OFFSET;
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merge = malloc(sizeof(struct option) * (num_new + num_old + 1));
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memcpy(merge, oldopts, num_old * sizeof(struct option));
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for (i = 0; i < num_new; i++) {
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merge[num_old + i] = newopts[i];
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merge[num_old + i].val += *option_offset;
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}
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memset(merge + num_old + num_new, 0, sizeof(struct option));
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return merge;
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}
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/*XXX: TC_CONFIG_XT_H */
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#ifndef TRUE
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#define TRUE 1
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#endif
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#ifndef FALSE
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#define FALSE 0
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#endif
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/*XXX: TC_CONFIG_XT_H */
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int
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check_inverse(const char option[], int *invert, int *my_optind, int argc)
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{
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if (option && strcmp(option, "!") == 0) {
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if (*invert)
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exit_error(PARAMETER_PROBLEM,
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"Multiple `!' flags not allowed");
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*invert = TRUE;
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if (my_optind != NULL) {
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++*my_optind;
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if (argc && *my_optind > argc)
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exit_error(PARAMETER_PROBLEM,
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"no argument following `!'");
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}
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return TRUE;
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}
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return FALSE;
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}
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/*XXX: TC_CONFIG_XT_H */
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void exit_error(enum exittype status, const char *msg, ...)
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{
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va_list args;
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va_start(args, msg);
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fprintf(stderr, "%s v%s: ", pname, pversion);
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vfprintf(stderr, msg, args);
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va_end(args);
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fprintf(stderr, "\n");
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/* On error paths, make sure that we don't leak memory */
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exit(status);
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}
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/*XXX: TC_CONFIG_XT_H */
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static void set_revision(char *name, u_int8_t revision)
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{
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/* Old kernel sources don't have ".revision" field,
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* but we stole a byte from name. */
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name[IPT_FUNCTION_MAXNAMELEN - 2] = '\0';
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name[IPT_FUNCTION_MAXNAMELEN - 1] = revision;
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}
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/*
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* we may need to check for version mismatch
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*/
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int
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build_st(struct xtables_target *target, struct xt_entry_target *t)
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{
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size_t size =
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XT_ALIGN(sizeof(struct xt_entry_target)) + target->size;
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if (t == NULL) {
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target->t = fw_calloc(1, size);
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target->t->u.target_size = size;
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strcpy(target->t->u.user.name, target->name);
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set_revision(target->t->u.user.name, target->revision);
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if (target->init != NULL)
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target->init(target->t);
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} else {
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target->t = t;
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}
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return 0;
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}
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inline void set_lib_dir(void)
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{
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lib_dir = getenv("XTABLES_LIBDIR");
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if (!lib_dir) {
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lib_dir = getenv("IPTABLES_LIB_DIR");
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if (lib_dir)
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fprintf(stderr, "using deprecated IPTABLES_LIB_DIR\n");
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}
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if (lib_dir == NULL)
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lib_dir = XT_LIB_DIR;
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}
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static int parse_ipt(struct action_util *a, int *argc_p,
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char ***argv_p, int tca_id, struct nlmsghdr *n)
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{
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struct xtables_target *m = NULL;
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struct ipt_entry fw;
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struct rtattr *tail;
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int c;
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int rargc = *argc_p;
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char **argv = *argv_p;
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int argc = 0, iargc = 0;
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char k[16];
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int size = 0;
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int iok = 0, ok = 0;
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__u32 hook = 0, index = 0;
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set_lib_dir();
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{
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int i;
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for (i = 0; i < rargc; i++) {
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if (NULL == argv[i] || 0 == strcmp(argv[i], "action")) {
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break;
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}
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}
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iargc = argc = i;
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}
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if (argc <= 2) {
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fprintf(stderr, "bad arguments to ipt %d vs %d\n", argc, rargc);
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return -1;
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}
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while (1) {
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c = getopt_long(argc, argv, "j:", opts, NULL);
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if (c == -1)
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break;
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switch (c) {
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case 'j':
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m = find_target(optarg, TRY_LOAD);
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if (m != NULL) {
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if (build_st(m, NULL) < 0) {
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printf(" %s error\n", m->name);
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return -1;
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}
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opts =
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merge_options(opts, m->extra_opts,
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&m->option_offset);
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} else {
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fprintf(stderr, " failed to find target %s\n\n", optarg);
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return -1;
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}
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ok++;
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break;
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default:
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memset(&fw, 0, sizeof(fw));
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if (m) {
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m->parse(c - m->option_offset, argv, 0,
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&m->tflags, NULL, &m->t);
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} else {
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fprintf(stderr, " failed to find target %s\n\n", optarg);
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return -1;
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}
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ok++;
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break;
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}
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}
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if (iargc > optind) {
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if (matches(argv[optind], "index") == 0) {
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if (get_u32(&index, argv[optind + 1], 10)) {
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fprintf(stderr, "Illegal \"index\"\n");
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free_opts(opts);
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return -1;
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}
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iok++;
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optind += 2;
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}
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}
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if (!ok && !iok) {
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fprintf(stderr, " ipt Parser BAD!! (%s)\n", *argv);
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return -1;
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}
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/* check that we passed the correct parameters to the target */
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if (m)
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m->final_check(m->tflags);
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{
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struct tcmsg *t = NLMSG_DATA(n);
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if (t->tcm_parent != TC_H_ROOT
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&& t->tcm_parent == TC_H_MAJ(TC_H_INGRESS)) {
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hook = NF_IP_PRE_ROUTING;
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} else {
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hook = NF_IP_POST_ROUTING;
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}
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}
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tail = NLMSG_TAIL(n);
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addattr_l(n, MAX_MSG, tca_id, NULL, 0);
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fprintf(stdout, "tablename: %s hook: %s\n ", tname, ipthooks[hook]);
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fprintf(stdout, "\ttarget: ");
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if (m)
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m->print(NULL, m->t, 0);
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fprintf(stdout, " index %d\n", index);
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if (strlen(tname) > 16) {
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size = 16;
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k[15] = 0;
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} else {
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size = 1 + strlen(tname);
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}
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strncpy(k, tname, size);
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addattr_l(n, MAX_MSG, TCA_IPT_TABLE, k, size);
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addattr_l(n, MAX_MSG, TCA_IPT_HOOK, &hook, 4);
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addattr_l(n, MAX_MSG, TCA_IPT_INDEX, &index, 4);
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if (m)
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addattr_l(n, MAX_MSG, TCA_IPT_TARG, m->t, m->t->u.target_size);
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tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
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argc -= optind;
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argv += optind;
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*argc_p = rargc - iargc;
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*argv_p = argv;
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optind = 0;
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free_opts(opts);
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/* Clear flags if target will be used again */
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m->tflags = 0;
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m->used = 0;
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/* Free allocated memory */
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if (m->t)
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free(m->t);
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return 0;
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}
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static int
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print_ipt(struct action_util *au, FILE * f, struct rtattr *arg)
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{
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struct rtattr *tb[TCA_IPT_MAX + 1];
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struct xt_entry_target *t = NULL;
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if (arg == NULL)
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return -1;
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set_lib_dir();
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parse_rtattr_nested(tb, TCA_IPT_MAX, arg);
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if (tb[TCA_IPT_TABLE] == NULL) {
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fprintf(f, "[NULL ipt table name ] assuming mangle ");
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} else {
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fprintf(f, "tablename: %s ",
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rta_getattr_str(tb[TCA_IPT_TABLE]));
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}
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if (tb[TCA_IPT_HOOK] == NULL) {
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fprintf(f, "[NULL ipt hook name ]\n ");
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return -1;
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} else {
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__u32 hook;
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hook = rta_getattr_u32(tb[TCA_IPT_HOOK]);
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fprintf(f, " hook: %s\n", ipthooks[hook]);
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}
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if (tb[TCA_IPT_TARG] == NULL) {
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fprintf(f, "\t[NULL ipt target parameters ]\n");
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return -1;
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} else {
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struct xtables_target *m = NULL;
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t = RTA_DATA(tb[TCA_IPT_TARG]);
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m = find_target(t->u.user.name, TRY_LOAD);
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if (m != NULL) {
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if (build_st(m, t) < 0) {
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fprintf(stderr, " %s error\n", m->name);
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return -1;
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}
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opts =
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merge_options(opts, m->extra_opts,
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&m->option_offset);
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} else {
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fprintf(stderr, " failed to find target %s\n\n",
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t->u.user.name);
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return -1;
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}
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fprintf(f, "\ttarget ");
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m->print(NULL, m->t, 0);
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if (tb[TCA_IPT_INDEX] == NULL) {
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fprintf(f, " [NULL ipt target index ]\n");
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} else {
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__u32 index;
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index = rta_getattr_u32(tb[TCA_IPT_INDEX]);
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fprintf(f, "\n\tindex %u", index);
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}
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if (tb[TCA_IPT_CNT]) {
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struct tc_cnt *c = RTA_DATA(tb[TCA_IPT_CNT]);
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fprintf(f, " ref %d bind %d", c->refcnt, c->bindcnt);
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}
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if (show_stats) {
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if (tb[TCA_IPT_TM]) {
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struct tcf_t *tm = RTA_DATA(tb[TCA_IPT_TM]);
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print_tm(f, tm);
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}
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}
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fprintf(f, "\n");
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}
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free_opts(opts);
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return 0;
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}
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struct action_util ipt_action_util = {
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.id = "ipt",
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.parse_aopt = parse_ipt,
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.print_aopt = print_ipt,
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};
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