source: MondoRescue/branches/2.2.5/mindi-busybox/networking/libiproute/iprule.c

Last change on this file was 1765, checked in by Bruno Cornec, 16 years ago

Update to busybox 1.7.2
  • Property svn:eol-style set to native
File size: 8.6 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * iprule.c "ip rule".
4 *
5 * This program is free software; you can redistribute 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: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
11 *
12 *
13 * Changes:
14 *
15 * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
16 * initially integrated into busybox by Bernhard Fischer
17 */
18
19#include <syslog.h>
20//#include <sys/socket.h>
21#include <netinet/in.h>
22#include <netinet/ip.h>
23#include <arpa/inet.h>
24
25#include "ip_common.h" /* #include "libbb.h" is inside */
26#include "rt_names.h"
27#include "utils.h"
28
29/*
30static void usage(void) __attribute__((noreturn));
31
32static void usage(void)
33{
34 fprintf(stderr, "Usage: ip rule [ list | add | del ] SELECTOR ACTION\n");
35 fprintf(stderr, "SELECTOR := [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK ]\n");
36 fprintf(stderr, " [ dev STRING ] [ pref NUMBER ]\n");
37 fprintf(stderr, "ACTION := [ table TABLE_ID ] [ nat ADDRESS ]\n");
38 fprintf(stderr, " [ prohibit | reject | unreachable ]\n");
39 fprintf(stderr, " [ realms [SRCREALM/]DSTREALM ]\n");
40 fprintf(stderr, "TABLE_ID := [ local | main | default | NUMBER ]\n");
41 exit(-1);
42}
43*/
44
45static int print_rule(struct sockaddr_nl *who ATTRIBUTE_UNUSED,
46 struct nlmsghdr *n, void *arg)
47{
48 FILE *fp = (FILE*)arg;
49 struct rtmsg *r = NLMSG_DATA(n);
50 int len = n->nlmsg_len;
51 int host_len = -1;
52 struct rtattr * tb[RTA_MAX+1];
53 char abuf[256];
54 SPRINT_BUF(b1);
55
56 if (n->nlmsg_type != RTM_NEWRULE)
57 return 0;
58
59 len -= NLMSG_LENGTH(sizeof(*r));
60 if (len < 0)
61 return -1;
62
63 memset(tb, 0, sizeof(tb));
64 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
65
66 if (r->rtm_family == AF_INET)
67 host_len = 32;
68 else if (r->rtm_family == AF_INET6)
69 host_len = 128;
70/* else if (r->rtm_family == AF_DECnet)
71 host_len = 16;
72 else if (r->rtm_family == AF_IPX)
73 host_len = 80;
74*/
75 if (tb[RTA_PRIORITY])
76 fprintf(fp, "%u:\t", *(unsigned*)RTA_DATA(tb[RTA_PRIORITY]));
77 else
78 fprintf(fp, "0:\t");
79
80 fprintf(fp, "from ");
81 if (tb[RTA_SRC]) {
82 if (r->rtm_src_len != host_len) {
83 fprintf(fp, "%s/%u", rt_addr_n2a(r->rtm_family,
84 RTA_PAYLOAD(tb[RTA_SRC]),
85 RTA_DATA(tb[RTA_SRC]),
86 abuf, sizeof(abuf)),
87 r->rtm_src_len
88 );
89 } else {
90 fprintf(fp, "%s", format_host(r->rtm_family,
91 RTA_PAYLOAD(tb[RTA_SRC]),
92 RTA_DATA(tb[RTA_SRC]),
93 abuf, sizeof(abuf))
94 );
95 }
96 } else if (r->rtm_src_len) {
97 fprintf(fp, "0/%d", r->rtm_src_len);
98 } else {
99 fprintf(fp, "all");
100 }
101 fprintf(fp, " ");
102
103 if (tb[RTA_DST]) {
104 if (r->rtm_dst_len != host_len) {
105 fprintf(fp, "to %s/%u ", rt_addr_n2a(r->rtm_family,
106 RTA_PAYLOAD(tb[RTA_DST]),
107 RTA_DATA(tb[RTA_DST]),
108 abuf, sizeof(abuf)),
109 r->rtm_dst_len
110 );
111 } else {
112 fprintf(fp, "to %s ", format_host(r->rtm_family,
113 RTA_PAYLOAD(tb[RTA_DST]),
114 RTA_DATA(tb[RTA_DST]),
115 abuf, sizeof(abuf)));
116 }
117 } else if (r->rtm_dst_len) {
118 fprintf(fp, "to 0/%d ", r->rtm_dst_len);
119 }
120
121 if (r->rtm_tos) {
122 fprintf(fp, "tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
123 }
124 if (tb[RTA_PROTOINFO]) {
125 fprintf(fp, "fwmark %#x ", *(uint32_t*)RTA_DATA(tb[RTA_PROTOINFO]));
126 }
127
128 if (tb[RTA_IIF]) {
129 fprintf(fp, "iif %s ", (char*)RTA_DATA(tb[RTA_IIF]));
130 }
131
132 if (r->rtm_table)
133 fprintf(fp, "lookup %s ", rtnl_rttable_n2a(r->rtm_table, b1, sizeof(b1)));
134
135 if (tb[RTA_FLOW]) {
136 uint32_t to = *(uint32_t*)RTA_DATA(tb[RTA_FLOW]);
137 uint32_t from = to>>16;
138 to &= 0xFFFF;
139 if (from) {
140 fprintf(fp, "realms %s/",
141 rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
142 }
143 fprintf(fp, "%s ",
144 rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
145 }
146
147 if (r->rtm_type == RTN_NAT) {
148 if (tb[RTA_GATEWAY]) {
149 fprintf(fp, "map-to %s ",
150 format_host(r->rtm_family,
151 RTA_PAYLOAD(tb[RTA_GATEWAY]),
152 RTA_DATA(tb[RTA_GATEWAY]),
153 abuf, sizeof(abuf)));
154 } else
155 fprintf(fp, "masquerade");
156 } else if (r->rtm_type != RTN_UNICAST)
157 fprintf(fp, "%s", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
158
159 fputc('\n', fp);
160 fflush(fp);
161 return 0;
162}
163
164/* Return value becomes exitcode. It's okay to not return at all */
165static int iprule_list(int argc, char **argv)
166{
167 struct rtnl_handle rth;
168 int af = preferred_family;
169
170 if (af == AF_UNSPEC)
171 af = AF_INET;
172
173 if (argc > 0) {
174 //bb_error_msg("\"rule show\" needs no arguments");
175 bb_warn_ignoring_args(argc);
176 return -1;
177 }
178
179 xrtnl_open(&rth);
180
181 xrtnl_wilddump_request(&rth, af, RTM_GETRULE);
182 xrtnl_dump_filter(&rth, print_rule, stdout);
183
184 return 0;
185}
186
187/* Return value becomes exitcode. It's okay to not return at all */
188static int iprule_modify(int cmd, int argc, char **argv)
189{
190 static const char keywords[] ALIGN1 =
191 "from\0""to\0""preference\0""order\0""priority\0"
192 "tos\0""fwmark\0""realms\0""table\0""lookup\0""dev\0"
193 "iif\0""nat\0""map-to\0""type\0""help\0";
194 enum {
195 ARG_from = 1, ARG_to, ARG_preference, ARG_order, ARG_priority,
196 ARG_tos, ARG_fwmark, ARG_realms, ARG_table, ARG_lookup, ARG_dev,
197 ARG_iif, ARG_nat, ARG_map_to, ARG_type, ARG_help
198 };
199 bool table_ok = 0;
200 struct rtnl_handle rth;
201 struct {
202 struct nlmsghdr n;
203 struct rtmsg r;
204 char buf[1024];
205 } req;
206 smalluint key;
207
208 memset(&req, 0, sizeof(req));
209
210 req.n.nlmsg_type = cmd;
211 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
212 req.n.nlmsg_flags = NLM_F_REQUEST;
213 req.r.rtm_family = preferred_family;
214 req.r.rtm_protocol = RTPROT_BOOT;
215 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
216 req.r.rtm_table = 0;
217 req.r.rtm_type = RTN_UNSPEC;
218
219 if (cmd == RTM_NEWRULE) {
220 req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
221 req.r.rtm_type = RTN_UNICAST;
222 }
223
224 while (argc > 0) {
225 key = index_in_substrings(keywords, *argv) + 1;
226 if (key == 0) /* no match found in keywords array, bail out. */
227 bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
228 if (key == ARG_from) {
229 inet_prefix dst;
230 NEXT_ARG();
231 get_prefix(&dst, *argv, req.r.rtm_family);
232 req.r.rtm_src_len = dst.bitlen;
233 addattr_l(&req.n, sizeof(req), RTA_SRC, &dst.data, dst.bytelen);
234 } else if (key == ARG_to) {
235 inet_prefix dst;
236 NEXT_ARG();
237 get_prefix(&dst, *argv, req.r.rtm_family);
238 req.r.rtm_dst_len = dst.bitlen;
239 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
240 } else if (key == ARG_preference ||
241 key == ARG_order ||
242 key == ARG_priority) {
243 uint32_t pref;
244 NEXT_ARG();
245 if (get_u32(&pref, *argv, 0))
246 invarg(*argv, "preference");
247 addattr32(&req.n, sizeof(req), RTA_PRIORITY, pref);
248 } else if (key == ARG_tos) {
249 uint32_t tos;
250 NEXT_ARG();
251 if (rtnl_dsfield_a2n(&tos, *argv))
252 invarg(*argv, "TOS");
253 req.r.rtm_tos = tos;
254 } else if (key == ARG_fwmark) {
255 uint32_t fwmark;
256 NEXT_ARG();
257 if (get_u32(&fwmark, *argv, 0))
258 invarg(*argv, "fwmark");
259 addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark);
260 } else if (key == ARG_realms) {
261 uint32_t realm;
262 NEXT_ARG();
263 if (get_rt_realms(&realm, *argv))
264 invarg(*argv, "realms");
265 addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
266 } else if (key == ARG_table ||
267 key == ARG_lookup) {
268 uint32_t tid;
269 NEXT_ARG();
270 if (rtnl_rttable_a2n(&tid, *argv))
271 invarg(*argv, "table ID");
272 req.r.rtm_table = tid;
273 table_ok = 1;
274 } else if (key == ARG_dev ||
275 key == ARG_iif) {
276 NEXT_ARG();
277 addattr_l(&req.n, sizeof(req), RTA_IIF, *argv, strlen(*argv)+1);
278 } else if (key == ARG_nat ||
279 key == ARG_map_to) {
280 NEXT_ARG();
281 addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv));
282 req.r.rtm_type = RTN_NAT;
283 } else {
284 int type;
285
286 if (key == ARG_type) {
287 NEXT_ARG();
288 }
289 if (key == ARG_help)
290 bb_show_usage();
291 if (rtnl_rtntype_a2n(&type, *argv))
292 invarg(*argv, "type");
293 req.r.rtm_type = type;
294 }
295 argc--;
296 argv++;
297 }
298
299 if (req.r.rtm_family == AF_UNSPEC)
300 req.r.rtm_family = AF_INET;
301
302 if (!table_ok && cmd == RTM_NEWRULE)
303 req.r.rtm_table = RT_TABLE_MAIN;
304
305 xrtnl_open(&rth);
306
307 if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
308 return 2;
309
310 return 0;
311}
312
313/* Return value becomes exitcode. It's okay to not return at all */
314int do_iprule(int argc, char **argv)
315{
316 static const char ip_rule_commands[] ALIGN1 =
317 "add\0""delete\0""list\0""show\0";
318 int cmd = 2; /* list */
319
320 if (argc < 1)
321 return iprule_list(0, NULL);
322 if (*argv)
323 cmd = index_in_substrings(ip_rule_commands, *argv);
324
325 switch (cmd) {
326 case 0: /* add */
327 cmd = RTM_NEWRULE;
328 break;
329 case 1: /* delete */
330 cmd = RTM_DELRULE;
331 break;
332 case 2: /* list */
333 case 3: /* show */
334 return iprule_list(argc-1, argv+1);
335 break;
336 default:
337 bb_error_msg_and_die("unknown command %s", *argv);
338 }
339 return iprule_modify(cmd, argc-1, argv+1);
340}
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