Contents of /trunk/mkinitrd-magellan/busybox/networking/libiproute/iprule.c
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Revision 816 -
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Fri Apr 24 18:33:46 2009 UTC (15 years, 1 month ago) by niro
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Fri Apr 24 18:33:46 2009 UTC (15 years, 1 month ago) by niro
File MIME type: text/plain
File size: 8587 byte(s)
-updated to busybox-1.13.4
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 Reutner-Fischer |
17 | */ |
18 | |
19 | #include <netinet/in.h> |
20 | #include <netinet/ip.h> |
21 | #include <arpa/inet.h> |
22 | |
23 | #include "ip_common.h" /* #include "libbb.h" is inside */ |
24 | #include "rt_names.h" |
25 | #include "utils.h" |
26 | |
27 | /* |
28 | static void usage(void) __attribute__((noreturn)); |
29 | |
30 | static void usage(void) |
31 | { |
32 | fprintf(stderr, "Usage: ip rule [ list | add | del ] SELECTOR ACTION\n"); |
33 | fprintf(stderr, "SELECTOR := [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK ]\n"); |
34 | fprintf(stderr, " [ dev STRING ] [ pref NUMBER ]\n"); |
35 | fprintf(stderr, "ACTION := [ table TABLE_ID ] [ nat ADDRESS ]\n"); |
36 | fprintf(stderr, " [ prohibit | reject | unreachable ]\n"); |
37 | fprintf(stderr, " [ realms [SRCREALM/]DSTREALM ]\n"); |
38 | fprintf(stderr, "TABLE_ID := [ local | main | default | NUMBER ]\n"); |
39 | exit(-1); |
40 | } |
41 | */ |
42 | |
43 | static int print_rule(const struct sockaddr_nl *who UNUSED_PARAM, |
44 | struct nlmsghdr *n, void *arg UNUSED_PARAM) |
45 | { |
46 | struct rtmsg *r = NLMSG_DATA(n); |
47 | int len = n->nlmsg_len; |
48 | int host_len = -1; |
49 | struct rtattr * tb[RTA_MAX+1]; |
50 | char abuf[256]; |
51 | SPRINT_BUF(b1); |
52 | |
53 | if (n->nlmsg_type != RTM_NEWRULE) |
54 | return 0; |
55 | |
56 | len -= NLMSG_LENGTH(sizeof(*r)); |
57 | if (len < 0) |
58 | return -1; |
59 | |
60 | memset(tb, 0, sizeof(tb)); |
61 | parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len); |
62 | |
63 | if (r->rtm_family == AF_INET) |
64 | host_len = 32; |
65 | else if (r->rtm_family == AF_INET6) |
66 | host_len = 128; |
67 | /* else if (r->rtm_family == AF_DECnet) |
68 | host_len = 16; |
69 | else if (r->rtm_family == AF_IPX) |
70 | host_len = 80; |
71 | */ |
72 | if (tb[RTA_PRIORITY]) |
73 | printf("%u:\t", *(unsigned*)RTA_DATA(tb[RTA_PRIORITY])); |
74 | else |
75 | printf("0:\t"); |
76 | |
77 | printf("from "); |
78 | if (tb[RTA_SRC]) { |
79 | if (r->rtm_src_len != host_len) { |
80 | printf("%s/%u", rt_addr_n2a(r->rtm_family, |
81 | RTA_PAYLOAD(tb[RTA_SRC]), |
82 | RTA_DATA(tb[RTA_SRC]), |
83 | abuf, sizeof(abuf)), |
84 | r->rtm_src_len |
85 | ); |
86 | } else { |
87 | fputs(format_host(r->rtm_family, |
88 | RTA_PAYLOAD(tb[RTA_SRC]), |
89 | RTA_DATA(tb[RTA_SRC]), |
90 | abuf, sizeof(abuf)), stdout); |
91 | } |
92 | } else if (r->rtm_src_len) { |
93 | printf("0/%d", r->rtm_src_len); |
94 | } else { |
95 | printf("all"); |
96 | } |
97 | bb_putchar(' '); |
98 | |
99 | if (tb[RTA_DST]) { |
100 | if (r->rtm_dst_len != host_len) { |
101 | printf("to %s/%u ", rt_addr_n2a(r->rtm_family, |
102 | RTA_PAYLOAD(tb[RTA_DST]), |
103 | RTA_DATA(tb[RTA_DST]), |
104 | abuf, sizeof(abuf)), |
105 | r->rtm_dst_len |
106 | ); |
107 | } else { |
108 | printf("to %s ", format_host(r->rtm_family, |
109 | RTA_PAYLOAD(tb[RTA_DST]), |
110 | RTA_DATA(tb[RTA_DST]), |
111 | abuf, sizeof(abuf))); |
112 | } |
113 | } else if (r->rtm_dst_len) { |
114 | printf("to 0/%d ", r->rtm_dst_len); |
115 | } |
116 | |
117 | if (r->rtm_tos) { |
118 | printf("tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1))); |
119 | } |
120 | if (tb[RTA_PROTOINFO]) { |
121 | printf("fwmark %#x ", *(uint32_t*)RTA_DATA(tb[RTA_PROTOINFO])); |
122 | } |
123 | |
124 | if (tb[RTA_IIF]) { |
125 | printf("iif %s ", (char*)RTA_DATA(tb[RTA_IIF])); |
126 | } |
127 | |
128 | if (r->rtm_table) |
129 | printf("lookup %s ", rtnl_rttable_n2a(r->rtm_table, b1, sizeof(b1))); |
130 | |
131 | if (tb[RTA_FLOW]) { |
132 | uint32_t to = *(uint32_t*)RTA_DATA(tb[RTA_FLOW]); |
133 | uint32_t from = to>>16; |
134 | to &= 0xFFFF; |
135 | if (from) { |
136 | printf("realms %s/", |
137 | rtnl_rtrealm_n2a(from, b1, sizeof(b1))); |
138 | } |
139 | printf("%s ", |
140 | rtnl_rtrealm_n2a(to, b1, sizeof(b1))); |
141 | } |
142 | |
143 | if (r->rtm_type == RTN_NAT) { |
144 | if (tb[RTA_GATEWAY]) { |
145 | printf("map-to %s ", |
146 | format_host(r->rtm_family, |
147 | RTA_PAYLOAD(tb[RTA_GATEWAY]), |
148 | RTA_DATA(tb[RTA_GATEWAY]), |
149 | abuf, sizeof(abuf))); |
150 | } else |
151 | printf("masquerade"); |
152 | } else if (r->rtm_type != RTN_UNICAST) |
153 | fputs(rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)), stdout); |
154 | |
155 | bb_putchar('\n'); |
156 | /*fflush(stdout);*/ |
157 | return 0; |
158 | } |
159 | |
160 | /* Return value becomes exitcode. It's okay to not return at all */ |
161 | static int iprule_list(char **argv) |
162 | { |
163 | struct rtnl_handle rth; |
164 | int af = preferred_family; |
165 | |
166 | if (af == AF_UNSPEC) |
167 | af = AF_INET; |
168 | |
169 | if (*argv) { |
170 | //bb_error_msg("\"rule show\" needs no arguments"); |
171 | bb_warn_ignoring_args(1); |
172 | return -1; |
173 | } |
174 | |
175 | xrtnl_open(&rth); |
176 | |
177 | xrtnl_wilddump_request(&rth, af, RTM_GETRULE); |
178 | xrtnl_dump_filter(&rth, print_rule, NULL); |
179 | |
180 | return 0; |
181 | } |
182 | |
183 | /* Return value becomes exitcode. It's okay to not return at all */ |
184 | static int iprule_modify(int cmd, char **argv) |
185 | { |
186 | static const char keywords[] ALIGN1 = |
187 | "from\0""to\0""preference\0""order\0""priority\0" |
188 | "tos\0""fwmark\0""realms\0""table\0""lookup\0""dev\0" |
189 | "iif\0""nat\0""map-to\0""type\0""help\0"; |
190 | enum { |
191 | ARG_from = 1, ARG_to, ARG_preference, ARG_order, ARG_priority, |
192 | ARG_tos, ARG_fwmark, ARG_realms, ARG_table, ARG_lookup, ARG_dev, |
193 | ARG_iif, ARG_nat, ARG_map_to, ARG_type, ARG_help |
194 | }; |
195 | bool table_ok = 0; |
196 | struct rtnl_handle rth; |
197 | struct { |
198 | struct nlmsghdr n; |
199 | struct rtmsg r; |
200 | char buf[1024]; |
201 | } req; |
202 | smalluint key; |
203 | |
204 | memset(&req, 0, sizeof(req)); |
205 | |
206 | req.n.nlmsg_type = cmd; |
207 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); |
208 | req.n.nlmsg_flags = NLM_F_REQUEST; |
209 | req.r.rtm_family = preferred_family; |
210 | req.r.rtm_protocol = RTPROT_BOOT; |
211 | req.r.rtm_scope = RT_SCOPE_UNIVERSE; |
212 | req.r.rtm_table = 0; |
213 | req.r.rtm_type = RTN_UNSPEC; |
214 | |
215 | if (cmd == RTM_NEWRULE) { |
216 | req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL; |
217 | req.r.rtm_type = RTN_UNICAST; |
218 | } |
219 | |
220 | while (*argv) { |
221 | key = index_in_substrings(keywords, *argv) + 1; |
222 | if (key == 0) /* no match found in keywords array, bail out. */ |
223 | bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name); |
224 | if (key == ARG_from) { |
225 | inet_prefix dst; |
226 | NEXT_ARG(); |
227 | get_prefix(&dst, *argv, req.r.rtm_family); |
228 | req.r.rtm_src_len = dst.bitlen; |
229 | addattr_l(&req.n, sizeof(req), RTA_SRC, &dst.data, dst.bytelen); |
230 | } else if (key == ARG_to) { |
231 | inet_prefix dst; |
232 | NEXT_ARG(); |
233 | get_prefix(&dst, *argv, req.r.rtm_family); |
234 | req.r.rtm_dst_len = dst.bitlen; |
235 | addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen); |
236 | } else if (key == ARG_preference || |
237 | key == ARG_order || |
238 | key == ARG_priority) { |
239 | uint32_t pref; |
240 | NEXT_ARG(); |
241 | if (get_u32(&pref, *argv, 0)) |
242 | invarg(*argv, "preference"); |
243 | addattr32(&req.n, sizeof(req), RTA_PRIORITY, pref); |
244 | } else if (key == ARG_tos) { |
245 | uint32_t tos; |
246 | NEXT_ARG(); |
247 | if (rtnl_dsfield_a2n(&tos, *argv)) |
248 | invarg(*argv, "TOS"); |
249 | req.r.rtm_tos = tos; |
250 | } else if (key == ARG_fwmark) { |
251 | uint32_t fwmark; |
252 | NEXT_ARG(); |
253 | if (get_u32(&fwmark, *argv, 0)) |
254 | invarg(*argv, "fwmark"); |
255 | addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark); |
256 | } else if (key == ARG_realms) { |
257 | uint32_t realm; |
258 | NEXT_ARG(); |
259 | if (get_rt_realms(&realm, *argv)) |
260 | invarg(*argv, "realms"); |
261 | addattr32(&req.n, sizeof(req), RTA_FLOW, realm); |
262 | } else if (key == ARG_table || |
263 | key == ARG_lookup) { |
264 | uint32_t tid; |
265 | NEXT_ARG(); |
266 | if (rtnl_rttable_a2n(&tid, *argv)) |
267 | invarg(*argv, "table ID"); |
268 | req.r.rtm_table = tid; |
269 | table_ok = 1; |
270 | } else if (key == ARG_dev || |
271 | key == ARG_iif) { |
272 | NEXT_ARG(); |
273 | addattr_l(&req.n, sizeof(req), RTA_IIF, *argv, strlen(*argv)+1); |
274 | } else if (key == ARG_nat || |
275 | key == ARG_map_to) { |
276 | NEXT_ARG(); |
277 | addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv)); |
278 | req.r.rtm_type = RTN_NAT; |
279 | } else { |
280 | int type; |
281 | |
282 | if (key == ARG_type) { |
283 | NEXT_ARG(); |
284 | } |
285 | if (key == ARG_help) |
286 | bb_show_usage(); |
287 | if (rtnl_rtntype_a2n(&type, *argv)) |
288 | invarg(*argv, "type"); |
289 | req.r.rtm_type = type; |
290 | } |
291 | argv++; |
292 | } |
293 | |
294 | if (req.r.rtm_family == AF_UNSPEC) |
295 | req.r.rtm_family = AF_INET; |
296 | |
297 | if (!table_ok && cmd == RTM_NEWRULE) |
298 | req.r.rtm_table = RT_TABLE_MAIN; |
299 | |
300 | xrtnl_open(&rth); |
301 | |
302 | if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) |
303 | return 2; |
304 | |
305 | return 0; |
306 | } |
307 | |
308 | /* Return value becomes exitcode. It's okay to not return at all */ |
309 | int do_iprule(char **argv) |
310 | { |
311 | static const char ip_rule_commands[] ALIGN1 = |
312 | "add\0""delete\0""list\0""show\0"; |
313 | int cmd = 2; /* list */ |
314 | |
315 | if (!*argv) |
316 | return iprule_list(argv); |
317 | |
318 | cmd = index_in_substrings(ip_rule_commands, *argv); |
319 | switch (cmd) { |
320 | case 0: /* add */ |
321 | cmd = RTM_NEWRULE; |
322 | break; |
323 | case 1: /* delete */ |
324 | cmd = RTM_DELRULE; |
325 | break; |
326 | case 2: /* list */ |
327 | case 3: /* show */ |
328 | return iprule_list(argv+1); |
329 | break; |
330 | default: |
331 | bb_error_msg_and_die("unknown command %s", *argv); |
332 | } |
333 | return iprule_modify(cmd, argv+1); |
334 | } |