source: MondoRescue/branches/2.2.9/mindi-busybox/networking/libiproute/iprule.c@ 3320

Last change on this file since 3320 was 3320, checked in by Bruno Cornec, 9 years ago
  • Re-add (thanks git BTW) the 2.2.9 branch which had been destroyed in the move to 3.0
  • Property svn:eol-style set to native
File size: 8.1 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU General Public License
5 * as published by the Free Software Foundation; either version
6 * 2 of the License, or (at your option) any later version.
7 *
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
10 * Changes:
11 *
12 * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
13 * initially integrated into busybox by Bernhard Reutner-Fischer
14 */
15
16#include <netinet/in.h>
17#include <netinet/ip.h>
18#include <arpa/inet.h>
19
20#include "ip_common.h" /* #include "libbb.h" is inside */
21#include "rt_names.h"
22#include "utils.h"
23
24/*
25static void usage(void) __attribute__((noreturn));
26
27static void usage(void)
28{
29 fprintf(stderr, "Usage: ip rule [ list | add | del ] SELECTOR ACTION\n");
30 fprintf(stderr, "SELECTOR := [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK ]\n");
31 fprintf(stderr, " [ dev STRING ] [ pref NUMBER ]\n");
32 fprintf(stderr, "ACTION := [ table TABLE_ID ] [ nat ADDRESS ]\n");
33 fprintf(stderr, " [ prohibit | reject | unreachable ]\n");
34 fprintf(stderr, " [ realms [SRCREALM/]DSTREALM ]\n");
35 fprintf(stderr, "TABLE_ID := [ local | main | default | NUMBER ]\n");
36 exit(-1);
37}
38*/
39
40static int FAST_FUNC print_rule(const struct sockaddr_nl *who UNUSED_PARAM,
41 struct nlmsghdr *n, void *arg UNUSED_PARAM)
42{
43 struct rtmsg *r = NLMSG_DATA(n);
44 int len = n->nlmsg_len;
45 int host_len = -1;
46 struct rtattr * tb[RTA_MAX+1];
47 char abuf[256];
48 SPRINT_BUF(b1);
49
50 if (n->nlmsg_type != RTM_NEWRULE)
51 return 0;
52
53 len -= NLMSG_LENGTH(sizeof(*r));
54 if (len < 0)
55 return -1;
56
57 memset(tb, 0, sizeof(tb));
58 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
59
60 if (r->rtm_family == AF_INET)
61 host_len = 32;
62 else if (r->rtm_family == AF_INET6)
63 host_len = 128;
64/* else if (r->rtm_family == AF_DECnet)
65 host_len = 16;
66 else if (r->rtm_family == AF_IPX)
67 host_len = 80;
68*/
69 printf("%u:\t", tb[RTA_PRIORITY] ?
70 *(unsigned*)RTA_DATA(tb[RTA_PRIORITY])
71 : 0);
72 printf("from ");
73 if (tb[RTA_SRC]) {
74 if (r->rtm_src_len != host_len) {
75 printf("%s/%u", rt_addr_n2a(r->rtm_family,
76 RTA_DATA(tb[RTA_SRC]),
77 abuf, sizeof(abuf)),
78 r->rtm_src_len
79 );
80 } else {
81 fputs(format_host(r->rtm_family,
82 RTA_PAYLOAD(tb[RTA_SRC]),
83 RTA_DATA(tb[RTA_SRC]),
84 abuf, sizeof(abuf)), stdout);
85 }
86 } else if (r->rtm_src_len) {
87 printf("0/%d", r->rtm_src_len);
88 } else {
89 printf("all");
90 }
91 bb_putchar(' ');
92
93 if (tb[RTA_DST]) {
94 if (r->rtm_dst_len != host_len) {
95 printf("to %s/%u ", rt_addr_n2a(r->rtm_family,
96 RTA_DATA(tb[RTA_DST]),
97 abuf, sizeof(abuf)),
98 r->rtm_dst_len
99 );
100 } else {
101 printf("to %s ", format_host(r->rtm_family,
102 RTA_PAYLOAD(tb[RTA_DST]),
103 RTA_DATA(tb[RTA_DST]),
104 abuf, sizeof(abuf)));
105 }
106 } else if (r->rtm_dst_len) {
107 printf("to 0/%d ", r->rtm_dst_len);
108 }
109
110 if (r->rtm_tos) {
111 printf("tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1));
112 }
113 if (tb[RTA_PROTOINFO]) {
114 printf("fwmark %#x ", *(uint32_t*)RTA_DATA(tb[RTA_PROTOINFO]));
115 }
116
117 if (tb[RTA_IIF]) {
118 printf("iif %s ", (char*)RTA_DATA(tb[RTA_IIF]));
119 }
120
121 if (r->rtm_table)
122 printf("lookup %s ", rtnl_rttable_n2a(r->rtm_table, b1));
123
124 if (tb[RTA_FLOW]) {
125 uint32_t to = *(uint32_t*)RTA_DATA(tb[RTA_FLOW]);
126 uint32_t from = to>>16;
127 to &= 0xFFFF;
128 if (from) {
129 printf("realms %s/",
130 rtnl_rtrealm_n2a(from, b1));
131 }
132 printf("%s ",
133 rtnl_rtrealm_n2a(to, b1));
134 }
135
136 if (r->rtm_type == RTN_NAT) {
137 if (tb[RTA_GATEWAY]) {
138 printf("map-to %s ",
139 format_host(r->rtm_family,
140 RTA_PAYLOAD(tb[RTA_GATEWAY]),
141 RTA_DATA(tb[RTA_GATEWAY]),
142 abuf, sizeof(abuf)));
143 } else
144 printf("masquerade");
145 } else if (r->rtm_type != RTN_UNICAST)
146 fputs(rtnl_rtntype_n2a(r->rtm_type, b1), stdout);
147
148 bb_putchar('\n');
149 /*fflush_all();*/
150 return 0;
151}
152
153/* Return value becomes exitcode. It's okay to not return at all */
154static int iprule_list(char **argv)
155{
156 struct rtnl_handle rth;
157 int af = preferred_family;
158
159 if (af == AF_UNSPEC)
160 af = AF_INET;
161
162 if (*argv) {
163 //bb_error_msg("\"rule show\" needs no arguments");
164 bb_warn_ignoring_args(*argv);
165 return -1;
166 }
167
168 xrtnl_open(&rth);
169
170 xrtnl_wilddump_request(&rth, af, RTM_GETRULE);
171 xrtnl_dump_filter(&rth, print_rule, NULL);
172
173 return 0;
174}
175
176/* Return value becomes exitcode. It's okay to not return at all */
177static int iprule_modify(int cmd, char **argv)
178{
179 static const char keywords[] ALIGN1 =
180 "from\0""to\0""preference\0""order\0""priority\0"
181 "tos\0""fwmark\0""realms\0""table\0""lookup\0""dev\0"
182 "iif\0""nat\0""map-to\0""type\0""help\0";
183 enum {
184 ARG_from = 1, ARG_to, ARG_preference, ARG_order, ARG_priority,
185 ARG_tos, ARG_fwmark, ARG_realms, ARG_table, ARG_lookup, ARG_dev,
186 ARG_iif, ARG_nat, ARG_map_to, ARG_type, ARG_help
187 };
188 bool table_ok = 0;
189 struct rtnl_handle rth;
190 struct {
191 struct nlmsghdr n;
192 struct rtmsg r;
193 char buf[1024];
194 } req;
195 smalluint key;
196
197 memset(&req, 0, sizeof(req));
198
199 req.n.nlmsg_type = cmd;
200 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
201 req.n.nlmsg_flags = NLM_F_REQUEST;
202 req.r.rtm_family = preferred_family;
203 req.r.rtm_protocol = RTPROT_BOOT;
204 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
205 req.r.rtm_table = 0;
206 req.r.rtm_type = RTN_UNSPEC;
207
208 if (cmd == RTM_NEWRULE) {
209 req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
210 req.r.rtm_type = RTN_UNICAST;
211 }
212
213 while (*argv) {
214 key = index_in_substrings(keywords, *argv) + 1;
215 if (key == 0) /* no match found in keywords array, bail out. */
216 bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
217 if (key == ARG_from) {
218 inet_prefix dst;
219 NEXT_ARG();
220 get_prefix(&dst, *argv, req.r.rtm_family);
221 req.r.rtm_src_len = dst.bitlen;
222 addattr_l(&req.n, sizeof(req), RTA_SRC, &dst.data, dst.bytelen);
223 } else if (key == ARG_to) {
224 inet_prefix dst;
225 NEXT_ARG();
226 get_prefix(&dst, *argv, req.r.rtm_family);
227 req.r.rtm_dst_len = dst.bitlen;
228 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
229 } else if (key == ARG_preference ||
230 key == ARG_order ||
231 key == ARG_priority
232 ) {
233 uint32_t pref;
234 NEXT_ARG();
235 pref = get_u32(*argv, "preference");
236 addattr32(&req.n, sizeof(req), RTA_PRIORITY, pref);
237 } else if (key == ARG_tos) {
238 uint32_t tos;
239 NEXT_ARG();
240 if (rtnl_dsfield_a2n(&tos, *argv))
241 invarg(*argv, "TOS");
242 req.r.rtm_tos = tos;
243 } else if (key == ARG_fwmark) {
244 uint32_t fwmark;
245 NEXT_ARG();
246 fwmark = get_u32(*argv, "fwmark");
247 addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark);
248 } else if (key == ARG_realms) {
249 uint32_t realm;
250 NEXT_ARG();
251 if (get_rt_realms(&realm, *argv))
252 invarg(*argv, "realms");
253 addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
254 } else if (key == ARG_table ||
255 key == ARG_lookup
256 ) {
257 uint32_t tid;
258 NEXT_ARG();
259 if (rtnl_rttable_a2n(&tid, *argv))
260 invarg(*argv, "table ID");
261 req.r.rtm_table = tid;
262 table_ok = 1;
263 } else if (key == ARG_dev ||
264 key == ARG_iif
265 ) {
266 NEXT_ARG();
267 addattr_l(&req.n, sizeof(req), RTA_IIF, *argv, strlen(*argv)+1);
268 } else if (key == ARG_nat ||
269 key == ARG_map_to
270 ) {
271 NEXT_ARG();
272 addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv));
273 req.r.rtm_type = RTN_NAT;
274 } else {
275 int type;
276
277 if (key == ARG_type) {
278 NEXT_ARG();
279 }
280 if (key == ARG_help)
281 bb_show_usage();
282 if (rtnl_rtntype_a2n(&type, *argv))
283 invarg(*argv, "type");
284 req.r.rtm_type = type;
285 }
286 argv++;
287 }
288
289 if (req.r.rtm_family == AF_UNSPEC)
290 req.r.rtm_family = AF_INET;
291
292 if (!table_ok && cmd == RTM_NEWRULE)
293 req.r.rtm_table = RT_TABLE_MAIN;
294
295 xrtnl_open(&rth);
296
297 if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
298 return 2;
299
300 return 0;
301}
302
303/* Return value becomes exitcode. It's okay to not return at all */
304int FAST_FUNC do_iprule(char **argv)
305{
306 static const char ip_rule_commands[] ALIGN1 =
307 "add\0""delete\0""list\0""show\0";
308 if (*argv) {
309 smalluint cmd = index_in_substrings(ip_rule_commands, *argv);
310 if (cmd > 3)
311 bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
312 argv++;
313 if (cmd < 2)
314 return iprule_modify((cmd == 0) ? RTM_NEWRULE : RTM_DELRULE, argv);
315 }
316 return iprule_list(argv);
317}
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