2 * m_xt.c xtables based targets
3 * utilities mostly ripped from iptables <duh, its the linux way>
5 * This program is free software; you can distribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version
8 * 2 of the License, or (at your option) any later version.
10 * Authors: J Hadi Salim (hadi@cyberus.ca)
14 #include <sys/socket.h>
15 #include <netinet/in.h>
16 #include <arpa/inet.h>
19 #include <linux/netfilter.h>
20 #include <linux/netfilter_ipv4/ip_tables.h>
24 #include <linux/tc_act/tc_ipt.h>
38 # define XT_LIB_DIR "/lib/xtables"
42 #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1)
43 #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
46 static const char *tname
= "mangle";
50 static const char *ipthooks
[] = {
58 static struct option original_opts
[] = {
67 static struct xtables_globals tcipt_globals
= {
69 .program_name
= "tc-ipt",
70 .program_version
= "0.2",
71 .orig_opts
= original_opts
,
72 .opts
= original_opts
,
77 * we may need to check for version mismatch
80 build_st(struct xtables_target
*target
, struct xt_entry_target
*t
)
84 XT_ALIGN(sizeof (struct xt_entry_target
)) + target
->size
;
87 target
->t
= xtables_calloc(1, size
);
88 target
->t
->u
.target_size
= size
;
89 strcpy(target
->t
->u
.user
.name
, target
->name
);
90 target
->t
->u
.user
.revision
= target
->revision
;
92 if (target
->init
!= NULL
)
93 target
->init(target
->t
);
101 inline void set_lib_dir(void)
104 lib_dir
= getenv("XTABLES_LIBDIR");
106 lib_dir
= getenv("IPTABLES_LIB_DIR");
108 fprintf(stderr
, "using deprecated IPTABLES_LIB_DIR \n");
111 lib_dir
= XT_LIB_DIR
;
115 static int parse_ipt(struct action_util
*a
,int *argc_p
,
116 char ***argv_p
, int tca_id
, struct nlmsghdr
*n
)
118 struct xtables_target
*m
= NULL
;
123 char **argv
= *argv_p
;
124 int argc
= 0, iargc
= 0;
128 __u32 hook
= 0, index
= 0;
130 xtables_init_all(&tcipt_globals
, NFPROTO_IPV4
);
135 for (i
= 0; i
< rargc
; i
++) {
136 if (NULL
== argv
[i
] || 0 == strcmp(argv
[i
], "action")) {
144 fprintf(stderr
,"bad arguements to ipt %d vs %d \n", argc
, rargc
);
149 c
= getopt_long(argc
, argv
, "j:", tcipt_globals
.opts
, NULL
);
154 m
= xtables_find_target(optarg
, XTF_TRY_LOAD
);
157 if (0 > build_st(m
, NULL
)) {
158 printf(" %s error \n", m
->name
);
162 xtables_merge_options(
163 #if (XTABLES_VERSION_CODE >= 6)
164 tcipt_globals
.orig_opts
,
170 fprintf(stderr
," failed to find target %s\n\n", optarg
);
177 memset(&fw
, 0, sizeof (fw
));
179 m
->parse(c
- m
->option_offset
, argv
, 0,
180 &m
->tflags
, NULL
, &m
->t
);
182 fprintf(stderr
," failed to find target %s\n\n", optarg
);
192 if (iargc
> optind
) {
193 if (matches(argv
[optind
], "index") == 0) {
194 if (get_u32(&index
, argv
[optind
+ 1], 10)) {
195 fprintf(stderr
, "Illegal \"index\"\n");
196 xtables_free_opts(1);
206 fprintf(stderr
," ipt Parser BAD!! (%s)\n", *argv
);
210 /* check that we passed the correct parameters to the target */
211 if (m
&& m
->final_check
)
212 m
->final_check(m
->tflags
);
215 struct tcmsg
*t
= NLMSG_DATA(n
);
216 if (t
->tcm_parent
!= TC_H_ROOT
217 && t
->tcm_parent
== TC_H_MAJ(TC_H_INGRESS
)) {
218 hook
= NF_IP_PRE_ROUTING
;
220 hook
= NF_IP_POST_ROUTING
;
224 tail
= NLMSG_TAIL(n
);
225 addattr_l(n
, MAX_MSG
, tca_id
, NULL
, 0);
226 fprintf(stdout
, "tablename: %s hook: %s\n ", tname
, ipthooks
[hook
]);
227 fprintf(stdout
, "\ttarget: ");
230 m
->print(NULL
, m
->t
, 0);
231 fprintf(stdout
, " index %d\n", index
);
233 if (strlen(tname
) > 16) {
237 size
= 1 + strlen(tname
);
239 strncpy(k
, tname
, size
);
241 addattr_l(n
, MAX_MSG
, TCA_IPT_TABLE
, k
, size
);
242 addattr_l(n
, MAX_MSG
, TCA_IPT_HOOK
, &hook
, 4);
243 addattr_l(n
, MAX_MSG
, TCA_IPT_INDEX
, &index
, 4);
245 addattr_l(n
, MAX_MSG
, TCA_IPT_TARG
, m
->t
, m
->t
->u
.target_size
);
246 tail
->rta_len
= (void *) NLMSG_TAIL(n
) - (void *) tail
;
250 *argc_p
= rargc
- iargc
;
254 xtables_free_opts(1);
255 /* Clear flags if target will be used again */
258 /* Free allocated memory */
268 print_ipt(struct action_util
*au
,FILE * f
, struct rtattr
*arg
)
270 struct rtattr
*tb
[TCA_IPT_MAX
+ 1];
271 struct xt_entry_target
*t
= NULL
;
276 xtables_init_all(&tcipt_globals
, NFPROTO_IPV4
);
279 parse_rtattr_nested(tb
, TCA_IPT_MAX
, arg
);
281 if (tb
[TCA_IPT_TABLE
] == NULL
) {
282 fprintf(f
, "[NULL ipt table name ] assuming mangle ");
284 fprintf(f
, "tablename: %s ",
285 (char *) RTA_DATA(tb
[TCA_IPT_TABLE
]));
288 if (tb
[TCA_IPT_HOOK
] == NULL
) {
289 fprintf(f
, "[NULL ipt hook name ]\n ");
293 hook
= *(__u32
*) RTA_DATA(tb
[TCA_IPT_HOOK
]);
294 fprintf(f
, " hook: %s \n", ipthooks
[hook
]);
297 if (tb
[TCA_IPT_TARG
] == NULL
) {
298 fprintf(f
, "\t[NULL ipt target parameters ] \n");
301 struct xtables_target
*m
= NULL
;
302 t
= RTA_DATA(tb
[TCA_IPT_TARG
]);
303 m
= xtables_find_target(t
->u
.user
.name
, XTF_TRY_LOAD
);
305 if (0 > build_st(m
, t
)) {
306 fprintf(stderr
, " %s error \n", m
->name
);
311 xtables_merge_options(
312 #if (XTABLES_VERSION_CODE >= 6)
313 tcipt_globals
.orig_opts
,
319 fprintf(stderr
, " failed to find target %s\n\n",
323 fprintf(f
, "\ttarget ");
324 m
->print(NULL
, m
->t
, 0);
325 if (tb
[TCA_IPT_INDEX
] == NULL
) {
326 fprintf(f
, " [NULL ipt target index ]\n");
329 index
= *(__u32
*) RTA_DATA(tb
[TCA_IPT_INDEX
]);
330 fprintf(f
, " \n\tindex %d", index
);
333 if (tb
[TCA_IPT_CNT
]) {
334 struct tc_cnt
*c
= RTA_DATA(tb
[TCA_IPT_CNT
]);;
335 fprintf(f
, " ref %d bind %d", c
->refcnt
, c
->bindcnt
);
338 if (tb
[TCA_IPT_TM
]) {
339 struct tcf_t
*tm
= RTA_DATA(tb
[TCA_IPT_TM
]);
346 xtables_free_opts(1);
351 struct action_util ipt_action_util
= {
353 .parse_aopt
= parse_ipt
,
354 .print_aopt
= print_ipt
,