| /* |
| * 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) |
| */ |
| |
| /*XXX: in the future (xtables 1.4.3?) get rid of everything tagged |
| * as TC_CONFIG_XT_H */ |
| |
| #include <syslog.h> |
| #include <sys/socket.h> |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| #include <net/if.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 <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> |
| #ifdef TC_CONFIG_XT_H |
| #include "xt-internal.h" |
| #endif |
| |
| #ifndef ALIGN |
| #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) |
| #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) |
| #endif |
| |
| static const char *pname = "tc-ipt"; |
| static const char *tname = "mangle"; |
| static const char *pversion = "0.2"; |
| |
| 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 option *opts = original_opts; |
| static unsigned int global_option_offset = 0; |
| char *lib_dir; |
| const char *program_version = XTABLES_VERSION; |
| const char *program_name = "tc-ipt"; |
| struct afinfo afinfo = { |
| .family = AF_INET, |
| .libprefix = "libxt_", |
| .ipproto = IPPROTO_IP, |
| .kmod = "ip_tables", |
| .so_rev_target = IPT_SO_GET_REVISION_TARGET, |
| }; |
| |
| |
| #define OPTION_OFFSET 256 |
| |
| /*XXX: TC_CONFIG_XT_H */ |
| static void free_opts(struct option *local_opts) |
| { |
| if (local_opts != original_opts) { |
| free(local_opts); |
| opts = original_opts; |
| global_option_offset = 0; |
| } |
| } |
| |
| /*XXX: TC_CONFIG_XT_H */ |
| 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; |
| } |
| |
| |
| /*XXX: TC_CONFIG_XT_H */ |
| #ifndef TRUE |
| #define TRUE 1 |
| #endif |
| #ifndef FALSE |
| #define FALSE 0 |
| #endif |
| |
| /*XXX: TC_CONFIG_XT_H */ |
| int |
| check_inverse(const char option[], int *invert, int *my_optind, int argc) |
| { |
| if (option && strcmp(option, "!") == 0) { |
| if (*invert) |
| exit_error(PARAMETER_PROBLEM, |
| "Multiple `!' flags not allowed"); |
| *invert = TRUE; |
| if (my_optind != NULL) { |
| ++*my_optind; |
| if (argc && *my_optind > argc) |
| exit_error(PARAMETER_PROBLEM, |
| "no argument following `!'"); |
| } |
| |
| return TRUE; |
| } |
| return FALSE; |
| } |
| |
| /*XXX: TC_CONFIG_XT_H */ |
| void exit_error(enum exittype status, const 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"); |
| /* On error paths, make sure that we don't leak memory */ |
| exit(status); |
| } |
| |
| /*XXX: TC_CONFIG_XT_H */ |
| 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 |
| */ |
| 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 (NULL == t) { |
| target->t = fw_calloc(1, size); |
| target->t->u.target_size = size; |
| strcpy(target->t->u.user.name, target->name); |
| set_revision(target->t->u.user.name, target->revision); |
| |
| if (target->init != NULL) |
| target->init(target->t); |
| } else { |
| target->t = t; |
| } |
| return 0; |
| |
| } |
| |
| inline 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 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[16]; |
| int size = 0; |
| int iok = 0, ok = 0; |
| __u32 hook = 0, index = 0; |
| |
| set_lib_dir(); |
| |
| { |
| 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 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 = find_target(optarg, TRY_LOAD); |
| 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) { |
| 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 = 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 = 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 xt_entry_target *t = NULL; |
| |
| if (arg == NULL) |
| return -1; |
| |
| set_lib_dir(); |
| |
| 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 ", |
| rta_getattr_str(tb[TCA_IPT_TABLE])); |
| } |
| |
| if (tb[TCA_IPT_HOOK] == NULL) { |
| fprintf(f, "[NULL ipt hook name ]\n "); |
| return -1; |
| } else { |
| __u32 hook; |
| hook = rta_getattr_u32(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 xtables_target *m = NULL; |
| t = RTA_DATA(tb[TCA_IPT_TARG]); |
| m = find_target(t->u.user.name, TRY_LOAD); |
| 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 = rta_getattr_u32(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"); |
| |
| } |
| free_opts(opts); |
| |
| return 0; |
| } |
| |
| struct action_util ipt_action_util = { |
| .id = "ipt", |
| .parse_aopt = parse_ipt, |
| .print_aopt = print_ipt, |
| }; |