2 * m_ipt.c iptables 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_ipv4/ip_tables.h>
22 #include <linux/tc_act/tc_ipt.h>
37 static const char *pname
= "tc-ipt";
38 static const char *tname
= "mangle";
39 static const char *pversion
= "0.1";
41 static const char *ipthooks
[] = {
49 static struct option original_opts
[] = {
54 static struct iptables_target
*t_list
= NULL
;
55 static struct option
*opts
= original_opts
;
56 static unsigned int global_option_offset
= 0;
57 #define OPTION_OFFSET 256
62 register_target(struct iptables_target
*me
)
64 /* fprintf(stderr, "\nDummy register_target %s \n", me->name);
72 xtables_register_target(struct iptables_target
*me
)
79 exit_tryhelp(int status
)
81 fprintf(stderr
, "Try `%s -h' or '%s --help' for more information.\n",
87 exit_error(enum exittype status
, char *msg
, ...)
92 fprintf(stderr
, "%s v%s: ", pname
, pversion
);
93 vfprintf(stderr
, msg
, args
);
95 fprintf(stderr
, "\n");
96 if (status
== PARAMETER_PROBLEM
)
98 if (status
== VERSION_PROBLEM
)
100 "Perhaps iptables or your kernel needs to be upgraded.\n");
104 /* stolen from iptables 1.2.11
105 They should really have them as a library so i can link to them
106 Email them next time i remember
110 addr_to_dotted(const struct in_addr
*addrp
)
113 const unsigned char *bytep
;
115 bytep
= (const unsigned char *) &(addrp
->s_addr
);
116 sprintf(buf
, "%d.%d.%d.%d", bytep
[0], bytep
[1], bytep
[2], bytep
[3]);
120 int string_to_number_ll(const char *s
, unsigned long long min
,
121 unsigned long long max
,
122 unsigned long long *ret
)
124 unsigned long long number
;
127 /* Handle hex, octal, etc. */
129 number
= strtoull(s
, &end
, 0);
130 if (*end
== '\0' && end
!= s
) {
131 /* we parsed a number, let's see if we want this */
132 if (errno
!= ERANGE
&& min
<= number
&& (!max
|| number
<= max
)) {
140 int string_to_number_l(const char *s
, unsigned long min
, unsigned long max
,
144 unsigned long long number
;
146 result
= string_to_number_ll(s
, min
, max
, &number
);
147 *ret
= (unsigned long)number
;
152 int string_to_number(const char *s
, unsigned int min
, unsigned int max
,
156 unsigned long number
;
158 result
= string_to_number_l(s
, min
, max
, &number
);
159 *ret
= (unsigned int)number
;
164 static void free_opts(struct option
*opts
)
166 if (opts
!= original_opts
) {
168 opts
= original_opts
;
169 global_option_offset
= 0;
173 static struct option
*
174 merge_options(struct option
*oldopts
, const struct option
*newopts
,
175 unsigned int *option_offset
)
177 struct option
*merge
;
178 unsigned int num_old
, num_new
, i
;
180 for (num_old
= 0; oldopts
[num_old
].name
; num_old
++) ;
181 for (num_new
= 0; newopts
[num_new
].name
; num_new
++) ;
183 *option_offset
= global_option_offset
+ OPTION_OFFSET
;
185 merge
= malloc(sizeof (struct option
) * (num_new
+ num_old
+ 1));
186 memcpy(merge
, oldopts
, num_old
* sizeof (struct option
));
187 for (i
= 0; i
< num_new
; i
++) {
188 merge
[num_old
+ i
] = newopts
[i
];
189 merge
[num_old
+ i
].val
+= *option_offset
;
191 memset(merge
+ num_old
+ num_new
, 0, sizeof (struct option
));
197 fw_calloc(size_t count
, size_t size
)
201 if ((p
= (void *) calloc(count
, size
)) == NULL
) {
202 perror("iptables: calloc failed");
208 static struct iptables_target
*
211 struct iptables_target
*m
;
212 for (m
= t_list
; m
; m
= m
->next
) {
213 if (strcmp(m
->name
, name
) == 0)
220 static struct iptables_target
*
221 get_target_name(const char *name
)
225 char *new_name
, *lname
;
226 struct iptables_target
*m
;
227 char path
[strlen(lib_dir
) + sizeof ("/libipt_.so") + strlen(name
)];
229 new_name
= malloc(strlen(name
) + 1);
230 lname
= malloc(strlen(name
) + 1);
232 memset(new_name
, '\0', strlen(name
) + 1);
234 exit_error(PARAMETER_PROBLEM
, "get_target_name");
237 memset(lname
, '\0', strlen(name
) + 1);
239 exit_error(PARAMETER_PROBLEM
, "get_target_name");
241 strcpy(new_name
, name
);
244 if (isupper(lname
[0])) {
246 for (i
= 0; i
< strlen(name
); i
++) {
247 lname
[i
] = tolower(lname
[i
]);
251 if (islower(new_name
[0])) {
253 for (i
= 0; i
< strlen(new_name
); i
++) {
254 new_name
[i
] = toupper(new_name
[i
]);
258 /* try libxt_xx first */
259 sprintf(path
, "%s/libxt_%s.so", lib_dir
, new_name
);
260 handle
= dlopen(path
, RTLD_LAZY
);
262 /* try libipt_xx next */
263 sprintf(path
, "%s/libipt_%s.so", lib_dir
, new_name
);
264 handle
= dlopen(path
, RTLD_LAZY
);
267 sprintf(path
, "%s/libxt_%s.so", lib_dir
, lname
);
268 handle
= dlopen(path
, RTLD_LAZY
);
272 sprintf(path
, "%s/libipt_%s.so", lib_dir
, lname
);
273 handle
= dlopen(path
, RTLD_LAZY
);
275 /* ok, lets give up .. */
277 fputs(dlerror(), stderr
);
283 m
= dlsym(handle
, new_name
);
284 if ((error
= dlerror()) != NULL
) {
285 m
= (struct iptables_target
*) dlsym(handle
, lname
);
286 if ((error
= dlerror()) != NULL
) {
287 m
= find_t(new_name
);
291 fputs(error
, stderr
);
292 fprintf(stderr
, "\n");
304 struct in_addr
*dotted_to_addr(const char *dotted
)
306 static struct in_addr addr
;
307 unsigned char *addrp
;
309 unsigned int onebyte
;
313 /* copy dotted string, because we need to modify it */
314 strncpy(buf
, dotted
, sizeof (buf
) - 1);
315 addrp
= (unsigned char *) &(addr
.s_addr
);
318 for (i
= 0; i
< 3; i
++) {
319 if ((q
= strchr(p
, '.')) == NULL
)
320 return (struct in_addr
*) NULL
;
323 if (string_to_number(p
, 0, 255, &onebyte
) == -1)
324 return (struct in_addr
*) NULL
;
326 addrp
[i
] = (unsigned char) onebyte
;
330 /* we've checked 3 bytes, now we check the last one */
331 if (string_to_number(p
, 0, 255, &onebyte
) == -1)
332 return (struct in_addr
*) NULL
;
334 addrp
[3] = (unsigned char) onebyte
;
339 static void set_revision(char *name
, u_int8_t revision
)
341 /* Old kernel sources don't have ".revision" field,
342 * but we stole a byte from name. */
343 name
[IPT_FUNCTION_MAXNAMELEN
- 2] = '\0';
344 name
[IPT_FUNCTION_MAXNAMELEN
- 1] = revision
;
348 * we may need to check for version mismatch
351 build_st(struct iptables_target
*target
, struct ipt_entry_target
*t
)
353 unsigned int nfcache
= 0;
359 IPT_ALIGN(sizeof (struct ipt_entry_target
)) + target
->size
;
362 target
->t
= fw_calloc(1, size
);
363 target
->t
->u
.target_size
= size
;
365 if (target
->init
!= NULL
)
366 target
->init(target
->t
, &nfcache
);
367 set_revision(target
->t
->u
.user
.name
, target
->revision
);
371 strcpy(target
->t
->u
.user
.name
, target
->name
);
378 static int parse_ipt(struct action_util
*a
,int *argc_p
,
379 char ***argv_p
, int tca_id
, struct nlmsghdr
*n
)
381 struct iptables_target
*m
= NULL
;
386 char **argv
= *argv_p
;
387 int argc
= 0, iargc
= 0;
392 __u32 hook
= 0, index
= 0;
395 lib_dir
= getenv("IPTABLES_LIB_DIR");
397 lib_dir
= IPT_LIB_DIR
;
401 for (i
= 0; i
< rargc
; i
++) {
402 if (NULL
== argv
[i
] || 0 == strcmp(argv
[i
], "action")) {
410 fprintf(stderr
,"bad arguements to ipt %d vs %d \n", argc
, rargc
);
415 c
= getopt_long(argc
, argv
, "j:", opts
, NULL
);
420 m
= get_target_name(optarg
);
423 if (0 > build_st(m
, NULL
)) {
424 printf(" %s error \n", m
->name
);
428 merge_options(opts
, m
->extra_opts
,
431 fprintf(stderr
," failed to find target %s\n\n", optarg
);
438 memset(&fw
, 0, sizeof (fw
));
440 m
->parse(c
- m
->option_offset
, argv
, 0,
441 &m
->tflags
, NULL
, &m
->t
);
443 fprintf(stderr
," failed to find target %s\n\n", optarg
);
453 if (iargc
> optind
) {
454 if (matches(argv
[optind
], "index") == 0) {
455 if (get_u32(&index
, argv
[optind
+ 1], 10)) {
456 fprintf(stderr
, "Illegal \"index\"\n");
467 fprintf(stderr
," ipt Parser BAD!! (%s)\n", *argv
);
471 /* check that we passed the correct parameters to the target */
473 m
->final_check(m
->tflags
);
476 struct tcmsg
*t
= NLMSG_DATA(n
);
477 if (t
->tcm_parent
!= TC_H_ROOT
478 && t
->tcm_parent
== TC_H_MAJ(TC_H_INGRESS
)) {
479 hook
= NF_IP_PRE_ROUTING
;
481 hook
= NF_IP_POST_ROUTING
;
485 tail
= NLMSG_TAIL(n
);
486 addattr_l(n
, MAX_MSG
, tca_id
, NULL
, 0);
487 fprintf(stdout
, "tablename: %s hook: %s\n ", tname
, ipthooks
[hook
]);
488 fprintf(stdout
, "\ttarget: ");
491 m
->print(NULL
, m
->t
, 0);
492 fprintf(stdout
, " index %d\n", index
);
494 if (strlen(tname
) > 16) {
498 size
= 1 + strlen(tname
);
500 strncpy(k
, tname
, size
);
502 addattr_l(n
, MAX_MSG
, TCA_IPT_TABLE
, k
, size
);
503 addattr_l(n
, MAX_MSG
, TCA_IPT_HOOK
, &hook
, 4);
504 addattr_l(n
, MAX_MSG
, TCA_IPT_INDEX
, &index
, 4);
506 addattr_l(n
, MAX_MSG
, TCA_IPT_TARG
, m
->t
, m
->t
->u
.target_size
);
507 tail
->rta_len
= (void *) NLMSG_TAIL(n
) - (void *) tail
;
511 *argc_p
= rargc
- iargc
;
522 print_ipt(struct action_util
*au
,FILE * f
, struct rtattr
*arg
)
524 struct rtattr
*tb
[TCA_IPT_MAX
+ 1];
525 struct ipt_entry_target
*t
= NULL
;
530 lib_dir
= getenv("IPTABLES_LIB_DIR");
532 lib_dir
= IPT_LIB_DIR
;
534 parse_rtattr_nested(tb
, TCA_IPT_MAX
, arg
);
536 if (tb
[TCA_IPT_TABLE
] == NULL
) {
537 fprintf(f
, "[NULL ipt table name ] assuming mangle ");
539 fprintf(f
, "tablename: %s ",
540 (char *) RTA_DATA(tb
[TCA_IPT_TABLE
]));
543 if (tb
[TCA_IPT_HOOK
] == NULL
) {
544 fprintf(f
, "[NULL ipt hook name ]\n ");
548 hook
= *(__u32
*) RTA_DATA(tb
[TCA_IPT_HOOK
]);
549 fprintf(f
, " hook: %s \n", ipthooks
[hook
]);
552 if (tb
[TCA_IPT_TARG
] == NULL
) {
553 fprintf(f
, "\t[NULL ipt target parameters ] \n");
556 struct iptables_target
*m
= NULL
;
557 t
= RTA_DATA(tb
[TCA_IPT_TARG
]);
558 m
= get_target_name(t
->u
.user
.name
);
560 if (0 > build_st(m
, t
)) {
561 fprintf(stderr
, " %s error \n", m
->name
);
566 merge_options(opts
, m
->extra_opts
,
569 fprintf(stderr
, " failed to find target %s\n\n",
573 fprintf(f
, "\ttarget ");
574 m
->print(NULL
, m
->t
, 0);
575 if (tb
[TCA_IPT_INDEX
] == NULL
) {
576 fprintf(f
, " [NULL ipt target index ]\n");
579 index
= *(__u32
*) RTA_DATA(tb
[TCA_IPT_INDEX
]);
580 fprintf(f
, " \n\tindex %d", index
);
583 if (tb
[TCA_IPT_CNT
]) {
584 struct tc_cnt
*c
= RTA_DATA(tb
[TCA_IPT_CNT
]);;
585 fprintf(f
, " ref %d bind %d", c
->refcnt
, c
->bindcnt
);
588 if (tb
[TCA_IPT_TM
]) {
589 struct tcf_t
*tm
= RTA_DATA(tb
[TCA_IPT_TM
]);
601 struct action_util ipt_action_util
= {
603 .parse_aopt
= parse_ipt
,
604 .print_aopt
= print_ipt
,