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a36ceb85 AH |
1 | /* |
2 | * m_xt.c xtables based targets | |
3 | * utilities mostly ripped from iptables <duh, its the linux way> | |
4 | * | |
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. | |
9 | * | |
10 | * Authors: J Hadi Salim (hadi@cyberus.ca) | |
11 | */ | |
12 | ||
13 | #include <syslog.h> | |
14 | #include <sys/socket.h> | |
15 | #include <netinet/in.h> | |
16 | #include <arpa/inet.h> | |
17 | #include <net/if.h> | |
18 | #include <limits.h> | |
19 | #include <linux/netfilter.h> | |
20 | #include <linux/netfilter_ipv4/ip_tables.h> | |
21 | #include <xtables.h> | |
22 | #include "utils.h" | |
23 | #include "tc_util.h" | |
24 | #include <linux/tc_act/tc_ipt.h> | |
25 | #include <stdio.h> | |
26 | #include <dlfcn.h> | |
27 | #include <getopt.h> | |
28 | #include <errno.h> | |
29 | #include <string.h> | |
30 | #include <netdb.h> | |
31 | #include <stdlib.h> | |
32 | #include <ctype.h> | |
33 | #include <stdarg.h> | |
a36ceb85 AH |
34 | #include <unistd.h> |
35 | #include <fcntl.h> | |
36 | #include <sys/wait.h> | |
37 | #ifndef XT_LIB_DIR | |
38 | # define XT_LIB_DIR "/lib/xtables" | |
39 | #endif | |
40 | ||
609ceb80 SH |
41 | #ifndef ALIGN |
42 | #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) | |
43 | #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) | |
44 | #endif | |
45 | ||
a36ceb85 AH |
46 | static const char *tname = "mangle"; |
47 | ||
48 | char *lib_dir; | |
49 | ||
50 | static const char *ipthooks[] = { | |
51 | "NF_IP_PRE_ROUTING", | |
52 | "NF_IP_LOCAL_IN", | |
53 | "NF_IP_FORWARD", | |
54 | "NF_IP_LOCAL_OUT", | |
55 | "NF_IP_POST_ROUTING", | |
56 | }; | |
57 | ||
58 | static struct option original_opts[] = { | |
59 | { | |
60 | .name = "jump", | |
61 | .has_arg = 1, | |
62 | .val = 'j' | |
63 | }, | |
64 | {0, 0, 0, 0} | |
65 | }; | |
66 | ||
67 | static struct xtables_globals tcipt_globals = { | |
68 | .option_offset = 0, | |
69 | .program_name = "tc-ipt", | |
70 | .program_version = "0.2", | |
71 | .orig_opts = original_opts, | |
72 | .opts = original_opts, | |
73 | .exit_err = NULL, | |
74 | }; | |
75 | ||
76 | /* | |
77 | * we may need to check for version mismatch | |
78 | */ | |
79 | int | |
80 | build_st(struct xtables_target *target, struct xt_entry_target *t) | |
81 | { | |
82 | ||
83 | size_t size = | |
84 | XT_ALIGN(sizeof (struct xt_entry_target)) + target->size; | |
85 | ||
86 | if (NULL == t) { | |
87 | target->t = xtables_calloc(1, size); | |
88 | target->t->u.target_size = size; | |
89 | strcpy(target->t->u.user.name, target->name); | |
be3c4d4f | 90 | target->t->u.user.revision = target->revision; |
a36ceb85 AH |
91 | |
92 | if (target->init != NULL) | |
93 | target->init(target->t); | |
94 | } else { | |
95 | target->t = t; | |
96 | } | |
97 | return 0; | |
98 | ||
99 | } | |
100 | ||
101 | inline void set_lib_dir(void) | |
102 | { | |
103 | ||
104 | lib_dir = getenv("XTABLES_LIBDIR"); | |
105 | if (!lib_dir) { | |
106 | lib_dir = getenv("IPTABLES_LIB_DIR"); | |
107 | if (lib_dir) | |
108 | fprintf(stderr, "using deprecated IPTABLES_LIB_DIR \n"); | |
109 | } | |
110 | if (lib_dir == NULL) | |
111 | lib_dir = XT_LIB_DIR; | |
112 | ||
113 | } | |
114 | ||
115 | static int parse_ipt(struct action_util *a,int *argc_p, | |
116 | char ***argv_p, int tca_id, struct nlmsghdr *n) | |
117 | { | |
118 | struct xtables_target *m = NULL; | |
119 | struct ipt_entry fw; | |
120 | struct rtattr *tail; | |
121 | int c; | |
122 | int rargc = *argc_p; | |
123 | char **argv = *argv_p; | |
124 | int argc = 0, iargc = 0; | |
125 | char k[16]; | |
a36ceb85 AH |
126 | int size = 0; |
127 | int iok = 0, ok = 0; | |
128 | __u32 hook = 0, index = 0; | |
a36ceb85 AH |
129 | |
130 | xtables_init_all(&tcipt_globals, NFPROTO_IPV4); | |
131 | set_lib_dir(); | |
132 | ||
133 | { | |
134 | int i; | |
135 | for (i = 0; i < rargc; i++) { | |
136 | if (NULL == argv[i] || 0 == strcmp(argv[i], "action")) { | |
137 | break; | |
138 | } | |
139 | } | |
140 | iargc = argc = i; | |
141 | } | |
142 | ||
143 | if (argc <= 2) { | |
144 | fprintf(stderr,"bad arguements to ipt %d vs %d \n", argc, rargc); | |
145 | return -1; | |
146 | } | |
147 | ||
148 | while (1) { | |
149 | c = getopt_long(argc, argv, "j:", tcipt_globals.opts, NULL); | |
150 | if (c == -1) | |
151 | break; | |
152 | switch (c) { | |
153 | case 'j': | |
154 | m = xtables_find_target(optarg, XTF_TRY_LOAD); | |
155 | if (NULL != m) { | |
156 | ||
157 | if (0 > build_st(m, NULL)) { | |
158 | printf(" %s error \n", m->name); | |
159 | return -1; | |
160 | } | |
161 | tcipt_globals.opts = | |
73de5d96 AH |
162 | xtables_merge_options( |
163 | #if (XTABLES_VERSION_CODE >= 6) | |
164 | tcipt_globals.orig_opts, | |
165 | #endif | |
166 | tcipt_globals.opts, | |
167 | m->extra_opts, | |
168 | &m->option_offset); | |
a36ceb85 AH |
169 | } else { |
170 | fprintf(stderr," failed to find target %s\n\n", optarg); | |
171 | return -1; | |
172 | } | |
173 | ok++; | |
174 | break; | |
175 | ||
176 | default: | |
177 | memset(&fw, 0, sizeof (fw)); | |
178 | if (m) { | |
179 | m->parse(c - m->option_offset, argv, 0, | |
180 | &m->tflags, NULL, &m->t); | |
181 | } else { | |
182 | fprintf(stderr," failed to find target %s\n\n", optarg); | |
183 | return -1; | |
184 | ||
185 | } | |
186 | ok++; | |
187 | break; | |
188 | ||
189 | } | |
190 | } | |
191 | ||
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); | |
197 | return -1; | |
198 | } | |
199 | iok++; | |
200 | ||
201 | optind += 2; | |
202 | } | |
203 | } | |
204 | ||
205 | if (!ok && !iok) { | |
206 | fprintf(stderr," ipt Parser BAD!! (%s)\n", *argv); | |
207 | return -1; | |
208 | } | |
209 | ||
210 | /* check that we passed the correct parameters to the target */ | |
211 | if (m && m->final_check) | |
212 | m->final_check(m->tflags); | |
213 | ||
214 | { | |
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; | |
219 | } else { | |
220 | hook = NF_IP_POST_ROUTING; | |
221 | } | |
222 | } | |
223 | ||
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: "); | |
228 | ||
229 | if (m) | |
230 | m->print(NULL, m->t, 0); | |
231 | fprintf(stdout, " index %d\n", index); | |
232 | ||
233 | if (strlen(tname) > 16) { | |
234 | size = 16; | |
235 | k[15] = 0; | |
236 | } else { | |
237 | size = 1 + strlen(tname); | |
238 | } | |
239 | strncpy(k, tname, size); | |
240 | ||
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); | |
244 | if (m) | |
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; | |
247 | ||
248 | argc -= optind; | |
249 | argv += optind; | |
250 | *argc_p = rargc - iargc; | |
251 | *argv_p = argv; | |
252 | ||
253 | optind = 0; | |
254 | xtables_free_opts(1); | |
a36ceb85 | 255 | |
4f3626f9 DM |
256 | if (m) { |
257 | /* Clear flags if target will be used again */ | |
258 | m->tflags = 0; | |
259 | m->used = 0; | |
260 | /* Free allocated memory */ | |
261 | if (m->t) | |
262 | free(m->t); | |
263 | } | |
a36ceb85 AH |
264 | |
265 | return 0; | |
266 | ||
267 | } | |
268 | ||
269 | static int | |
270 | print_ipt(struct action_util *au,FILE * f, struct rtattr *arg) | |
271 | { | |
272 | struct rtattr *tb[TCA_IPT_MAX + 1]; | |
273 | struct xt_entry_target *t = NULL; | |
274 | ||
275 | if (arg == NULL) | |
276 | return -1; | |
277 | ||
278 | xtables_init_all(&tcipt_globals, NFPROTO_IPV4); | |
279 | set_lib_dir(); | |
280 | ||
281 | parse_rtattr_nested(tb, TCA_IPT_MAX, arg); | |
282 | ||
283 | if (tb[TCA_IPT_TABLE] == NULL) { | |
284 | fprintf(f, "[NULL ipt table name ] assuming mangle "); | |
285 | } else { | |
286 | fprintf(f, "tablename: %s ", | |
287 | (char *) RTA_DATA(tb[TCA_IPT_TABLE])); | |
288 | } | |
289 | ||
290 | if (tb[TCA_IPT_HOOK] == NULL) { | |
291 | fprintf(f, "[NULL ipt hook name ]\n "); | |
292 | return -1; | |
293 | } else { | |
294 | __u32 hook; | |
295 | hook = *(__u32 *) RTA_DATA(tb[TCA_IPT_HOOK]); | |
296 | fprintf(f, " hook: %s \n", ipthooks[hook]); | |
297 | } | |
298 | ||
299 | if (tb[TCA_IPT_TARG] == NULL) { | |
300 | fprintf(f, "\t[NULL ipt target parameters ] \n"); | |
301 | return -1; | |
302 | } else { | |
303 | struct xtables_target *m = NULL; | |
304 | t = RTA_DATA(tb[TCA_IPT_TARG]); | |
305 | m = xtables_find_target(t->u.user.name, XTF_TRY_LOAD); | |
306 | if (NULL != m) { | |
307 | if (0 > build_st(m, t)) { | |
308 | fprintf(stderr, " %s error \n", m->name); | |
309 | return -1; | |
310 | } | |
311 | ||
312 | tcipt_globals.opts = | |
73de5d96 AH |
313 | xtables_merge_options( |
314 | #if (XTABLES_VERSION_CODE >= 6) | |
315 | tcipt_globals.orig_opts, | |
316 | #endif | |
317 | tcipt_globals.opts, | |
a36ceb85 AH |
318 | m->extra_opts, |
319 | &m->option_offset); | |
320 | } else { | |
321 | fprintf(stderr, " failed to find target %s\n\n", | |
322 | t->u.user.name); | |
323 | return -1; | |
324 | } | |
325 | fprintf(f, "\ttarget "); | |
326 | m->print(NULL, m->t, 0); | |
327 | if (tb[TCA_IPT_INDEX] == NULL) { | |
328 | fprintf(f, " [NULL ipt target index ]\n"); | |
329 | } else { | |
330 | __u32 index; | |
331 | index = *(__u32 *) RTA_DATA(tb[TCA_IPT_INDEX]); | |
332 | fprintf(f, " \n\tindex %d", index); | |
333 | } | |
334 | ||
335 | if (tb[TCA_IPT_CNT]) { | |
336 | struct tc_cnt *c = RTA_DATA(tb[TCA_IPT_CNT]);; | |
337 | fprintf(f, " ref %d bind %d", c->refcnt, c->bindcnt); | |
338 | } | |
339 | if (show_stats) { | |
340 | if (tb[TCA_IPT_TM]) { | |
341 | struct tcf_t *tm = RTA_DATA(tb[TCA_IPT_TM]); | |
342 | print_tm(f,tm); | |
343 | } | |
344 | } | |
345 | fprintf(f, " \n"); | |
346 | ||
347 | } | |
348 | xtables_free_opts(1); | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
8e91a80d JE |
353 | struct action_util xt_action_util = { |
354 | .id = "xt", | |
a36ceb85 AH |
355 | .parse_aopt = parse_ipt, |
356 | .print_aopt = print_ipt, | |
357 | }; | |
358 |