blob: c3b2109829d52080757ed9016b7126f57065c0d2 [file] [log] [blame]
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +00001/* vi: set sw=4 ts=4: */
2/*
Denys Vlasenkofb132e42010-10-29 11:46:52 +02003 * 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.
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +00007 *
Denys Vlasenkofb132e42010-10-29 11:46:52 +02008 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +00009 *
10 * Changes:
11 *
Denys Vlasenkofb132e42010-10-29 11:46:52 +020012 * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
Bernhard Reutner-Fischer6c4dade2008-09-25 12:13:34 +000013 * initially integrated into busybox by Bernhard Reutner-Fischer
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +000014 */
15
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +000016#include <netinet/in.h>
17#include <netinet/ip.h>
18#include <arpa/inet.h>
19
Denis Vlasenko9a7d38f2007-05-31 22:42:12 +000020#include "ip_common.h" /* #include "libbb.h" is inside */
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +000021#include "rt_names.h"
22#include "utils.h"
Denis Vlasenko9a7d38f2007-05-31 22:42:12 +000023
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +000024/*
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*/
Denis Vlasenko9a7d38f2007-05-31 22:42:12 +000039
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020040static int FAST_FUNC print_rule(const struct sockaddr_nl *who UNUSED_PARAM,
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +000041 struct nlmsghdr *n, void *arg UNUSED_PARAM)
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +000042{
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +000043 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];
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +000048
49 if (n->nlmsg_type != RTM_NEWRULE)
50 return 0;
51
52 len -= NLMSG_LENGTH(sizeof(*r));
53 if (len < 0)
54 return -1;
55
56 memset(tb, 0, sizeof(tb));
57 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
58
59 if (r->rtm_family == AF_INET)
60 host_len = 32;
61 else if (r->rtm_family == AF_INET6)
62 host_len = 128;
63/* else if (r->rtm_family == AF_DECnet)
64 host_len = 16;
65 else if (r->rtm_family == AF_IPX)
66 host_len = 80;
67*/
Bernhard Reutner-Fischer1b354982010-05-25 17:22:17 +020068 printf("%u:\t", tb[RTA_PRIORITY] ?
69 *(unsigned*)RTA_DATA(tb[RTA_PRIORITY])
70 : 0);
Denis Vlasenkobedfabd2008-06-05 05:00:24 +000071 printf("from ");
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +000072 if (tb[RTA_SRC]) {
73 if (r->rtm_src_len != host_len) {
Denis Vlasenkobedfabd2008-06-05 05:00:24 +000074 printf("%s/%u", rt_addr_n2a(r->rtm_family,
Denys Vlasenko60cb48c2013-01-14 15:57:44 +010075 RTA_DATA(tb[RTA_SRC]),
76 abuf, sizeof(abuf)),
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +000077 r->rtm_src_len
Denys Vlasenko60cb48c2013-01-14 15:57:44 +010078 );
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +000079 } else {
Denis Vlasenko605b20e2007-09-30 16:22:36 +000080 fputs(format_host(r->rtm_family,
Denys Vlasenko60cb48c2013-01-14 15:57:44 +010081 RTA_PAYLOAD(tb[RTA_SRC]),
82 RTA_DATA(tb[RTA_SRC]),
83 abuf, sizeof(abuf)),
84 stdout
85 );
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +000086 }
87 } else if (r->rtm_src_len) {
Denis Vlasenkobedfabd2008-06-05 05:00:24 +000088 printf("0/%d", r->rtm_src_len);
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +000089 } else {
Denis Vlasenkobedfabd2008-06-05 05:00:24 +000090 printf("all");
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +000091 }
Denis Vlasenkobedfabd2008-06-05 05:00:24 +000092 bb_putchar(' ');
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +000093
94 if (tb[RTA_DST]) {
95 if (r->rtm_dst_len != host_len) {
Denis Vlasenkobedfabd2008-06-05 05:00:24 +000096 printf("to %s/%u ", rt_addr_n2a(r->rtm_family,
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +000097 RTA_DATA(tb[RTA_DST]),
98 abuf, sizeof(abuf)),
99 r->rtm_dst_len
100 );
101 } else {
Denis Vlasenkobedfabd2008-06-05 05:00:24 +0000102 printf("to %s ", format_host(r->rtm_family,
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000103 RTA_PAYLOAD(tb[RTA_DST]),
104 RTA_DATA(tb[RTA_DST]),
105 abuf, sizeof(abuf)));
106 }
107 } else if (r->rtm_dst_len) {
Denis Vlasenkobedfabd2008-06-05 05:00:24 +0000108 printf("to 0/%d ", r->rtm_dst_len);
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000109 }
110
111 if (r->rtm_tos) {
Denys Vlasenko3d8d5e82015-10-08 13:02:28 +0200112 printf("tos %s ", rtnl_dsfield_n2a(r->rtm_tos));
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000113 }
114 if (tb[RTA_PROTOINFO]) {
Denis Vlasenkobedfabd2008-06-05 05:00:24 +0000115 printf("fwmark %#x ", *(uint32_t*)RTA_DATA(tb[RTA_PROTOINFO]));
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000116 }
117
118 if (tb[RTA_IIF]) {
Denis Vlasenkobedfabd2008-06-05 05:00:24 +0000119 printf("iif %s ", (char*)RTA_DATA(tb[RTA_IIF]));
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000120 }
121
122 if (r->rtm_table)
Denys Vlasenko3d8d5e82015-10-08 13:02:28 +0200123 printf("lookup %s ", rtnl_rttable_n2a(r->rtm_table));
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000124
125 if (tb[RTA_FLOW]) {
Denis Vlasenko98ee06d2006-12-31 18:57:37 +0000126 uint32_t to = *(uint32_t*)RTA_DATA(tb[RTA_FLOW]);
127 uint32_t from = to>>16;
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000128 to &= 0xFFFF;
129 if (from) {
Denis Vlasenkobedfabd2008-06-05 05:00:24 +0000130 printf("realms %s/",
Denys Vlasenko3d8d5e82015-10-08 13:02:28 +0200131 rtnl_rtrealm_n2a(from));
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000132 }
Denis Vlasenkobedfabd2008-06-05 05:00:24 +0000133 printf("%s ",
Denys Vlasenko3d8d5e82015-10-08 13:02:28 +0200134 rtnl_rtrealm_n2a(to));
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000135 }
136
137 if (r->rtm_type == RTN_NAT) {
138 if (tb[RTA_GATEWAY]) {
Denis Vlasenkobedfabd2008-06-05 05:00:24 +0000139 printf("map-to %s ",
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000140 format_host(r->rtm_family,
141 RTA_PAYLOAD(tb[RTA_GATEWAY]),
142 RTA_DATA(tb[RTA_GATEWAY]),
143 abuf, sizeof(abuf)));
144 } else
Denis Vlasenkobedfabd2008-06-05 05:00:24 +0000145 printf("masquerade");
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000146 } else if (r->rtm_type != RTN_UNICAST)
Denys Vlasenko3d8d5e82015-10-08 13:02:28 +0200147 fputs(rtnl_rtntype_n2a(r->rtm_type), stdout);
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000148
Denis Vlasenkobedfabd2008-06-05 05:00:24 +0000149 bb_putchar('\n');
Denys Vlasenko8131eea2009-11-02 14:19:51 +0100150 /*fflush_all();*/
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000151 return 0;
152}
153
Denis Vlasenko540a2a12007-04-07 01:14:45 +0000154/* Return value becomes exitcode. It's okay to not return at all */
Denis Vlasenkoed6a49c2007-11-18 22:56:25 +0000155static int iprule_list(char **argv)
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000156{
157 struct rtnl_handle rth;
158 int af = preferred_family;
159
160 if (af == AF_UNSPEC)
161 af = AF_INET;
162
Denis Vlasenkoed6a49c2007-11-18 22:56:25 +0000163 if (*argv) {
Bernhard Reutner-Fischer4d9a3582007-01-28 00:20:46 +0000164 //bb_error_msg("\"rule show\" needs no arguments");
Denys Vlasenkoa355da02010-01-04 13:16:08 +0100165 bb_warn_ignoring_args(*argv);
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000166 return -1;
167 }
168
Bernhard Reutner-Fischerb2908892007-04-12 11:34:39 +0000169 xrtnl_open(&rth);
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000170
Bernhard Reutner-Fischerb2908892007-04-12 11:34:39 +0000171 xrtnl_wilddump_request(&rth, af, RTM_GETRULE);
Denis Vlasenkobedfabd2008-06-05 05:00:24 +0000172 xrtnl_dump_filter(&rth, print_rule, NULL);
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000173
174 return 0;
175}
176
Denis Vlasenko540a2a12007-04-07 01:14:45 +0000177/* Return value becomes exitcode. It's okay to not return at all */
Denis Vlasenkoed6a49c2007-11-18 22:56:25 +0000178static int iprule_modify(int cmd, char **argv)
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000179{
Denis Vlasenko6ca409e2007-08-12 20:58:27 +0000180 static const char keywords[] ALIGN1 =
Denis Vlasenko990d0f62007-07-24 15:54:42 +0000181 "from\0""to\0""preference\0""order\0""priority\0"
182 "tos\0""fwmark\0""realms\0""table\0""lookup\0""dev\0"
183 "iif\0""nat\0""map-to\0""type\0""help\0";
184 enum {
185 ARG_from = 1, ARG_to, ARG_preference, ARG_order, ARG_priority,
186 ARG_tos, ARG_fwmark, ARG_realms, ARG_table, ARG_lookup, ARG_dev,
187 ARG_iif, ARG_nat, ARG_map_to, ARG_type, ARG_help
188 };
Bernhard Reutner-Fischercd0e80c2007-06-20 14:53:49 +0000189 bool table_ok = 0;
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000190 struct rtnl_handle rth;
191 struct {
Denys Vlasenkofb132e42010-10-29 11:46:52 +0200192 struct nlmsghdr n;
193 struct rtmsg r;
194 char buf[1024];
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000195 } req;
Bernhard Reutner-Fischercd0e80c2007-06-20 14:53:49 +0000196 smalluint key;
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000197
198 memset(&req, 0, sizeof(req));
199
200 req.n.nlmsg_type = cmd;
201 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
202 req.n.nlmsg_flags = NLM_F_REQUEST;
203 req.r.rtm_family = preferred_family;
204 req.r.rtm_protocol = RTPROT_BOOT;
205 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
206 req.r.rtm_table = 0;
207 req.r.rtm_type = RTN_UNSPEC;
208
209 if (cmd == RTM_NEWRULE) {
210 req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
211 req.r.rtm_type = RTN_UNICAST;
212 }
213
Denis Vlasenkoed6a49c2007-11-18 22:56:25 +0000214 while (*argv) {
Denis Vlasenko990d0f62007-07-24 15:54:42 +0000215 key = index_in_substrings(keywords, *argv) + 1;
Bernhard Reutner-Fischercd0e80c2007-06-20 14:53:49 +0000216 if (key == 0) /* no match found in keywords array, bail out. */
Denys Vlasenko0f296a32015-10-14 13:21:01 +0200217 invarg_1_to_2(*argv, applet_name);
Bernhard Reutner-Fischercd0e80c2007-06-20 14:53:49 +0000218 if (key == ARG_from) {
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000219 inet_prefix dst;
220 NEXT_ARG();
221 get_prefix(&dst, *argv, req.r.rtm_family);
222 req.r.rtm_src_len = dst.bitlen;
223 addattr_l(&req.n, sizeof(req), RTA_SRC, &dst.data, dst.bytelen);
Bernhard Reutner-Fischercd0e80c2007-06-20 14:53:49 +0000224 } else if (key == ARG_to) {
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000225 inet_prefix dst;
226 NEXT_ARG();
227 get_prefix(&dst, *argv, req.r.rtm_family);
228 req.r.rtm_dst_len = dst.bitlen;
229 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
Bernhard Reutner-Fischercd0e80c2007-06-20 14:53:49 +0000230 } else if (key == ARG_preference ||
231 key == ARG_order ||
Denys Vlasenko6b9f1632010-01-28 02:24:24 +0100232 key == ARG_priority
233 ) {
Denis Vlasenko98ee06d2006-12-31 18:57:37 +0000234 uint32_t pref;
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000235 NEXT_ARG();
Denis Vlasenko76140a72009-03-05 09:21:57 +0000236 pref = get_u32(*argv, "preference");
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000237 addattr32(&req.n, sizeof(req), RTA_PRIORITY, pref);
Bernhard Reutner-Fischercd0e80c2007-06-20 14:53:49 +0000238 } else if (key == ARG_tos) {
Denis Vlasenko98ee06d2006-12-31 18:57:37 +0000239 uint32_t tos;
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000240 NEXT_ARG();
241 if (rtnl_dsfield_a2n(&tos, *argv))
Denys Vlasenko0f296a32015-10-14 13:21:01 +0200242 invarg_1_to_2(*argv, "TOS");
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000243 req.r.rtm_tos = tos;
Bernhard Reutner-Fischercd0e80c2007-06-20 14:53:49 +0000244 } else if (key == ARG_fwmark) {
Denis Vlasenko98ee06d2006-12-31 18:57:37 +0000245 uint32_t fwmark;
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000246 NEXT_ARG();
Denis Vlasenko76140a72009-03-05 09:21:57 +0000247 fwmark = get_u32(*argv, "fwmark");
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000248 addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark);
Bernhard Reutner-Fischercd0e80c2007-06-20 14:53:49 +0000249 } else if (key == ARG_realms) {
Denis Vlasenko98ee06d2006-12-31 18:57:37 +0000250 uint32_t realm;
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000251 NEXT_ARG();
252 if (get_rt_realms(&realm, *argv))
Denys Vlasenko0f296a32015-10-14 13:21:01 +0200253 invarg_1_to_2(*argv, "realms");
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000254 addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
Bernhard Reutner-Fischercd0e80c2007-06-20 14:53:49 +0000255 } else if (key == ARG_table ||
Denys Vlasenko6b9f1632010-01-28 02:24:24 +0100256 key == ARG_lookup
257 ) {
Bernhard Reutner-Fischer4d9a3582007-01-28 00:20:46 +0000258 uint32_t tid;
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000259 NEXT_ARG();
260 if (rtnl_rttable_a2n(&tid, *argv))
Denys Vlasenko0f296a32015-10-14 13:21:01 +0200261 invarg_1_to_2(*argv, "table ID");
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000262 req.r.rtm_table = tid;
263 table_ok = 1;
Bernhard Reutner-Fischercd0e80c2007-06-20 14:53:49 +0000264 } else if (key == ARG_dev ||
Denys Vlasenko6b9f1632010-01-28 02:24:24 +0100265 key == ARG_iif
266 ) {
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000267 NEXT_ARG();
268 addattr_l(&req.n, sizeof(req), RTA_IIF, *argv, strlen(*argv)+1);
Bernhard Reutner-Fischercd0e80c2007-06-20 14:53:49 +0000269 } else if (key == ARG_nat ||
Denys Vlasenko6b9f1632010-01-28 02:24:24 +0100270 key == ARG_map_to
271 ) {
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000272 NEXT_ARG();
273 addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv));
274 req.r.rtm_type = RTN_NAT;
275 } else {
276 int type;
277
Bernhard Reutner-Fischercd0e80c2007-06-20 14:53:49 +0000278 if (key == ARG_type) {
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000279 NEXT_ARG();
280 }
Bernhard Reutner-Fischercd0e80c2007-06-20 14:53:49 +0000281 if (key == ARG_help)
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000282 bb_show_usage();
283 if (rtnl_rtntype_a2n(&type, *argv))
Denys Vlasenko0f296a32015-10-14 13:21:01 +0200284 invarg_1_to_2(*argv, "type");
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000285 req.r.rtm_type = type;
286 }
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000287 argv++;
288 }
289
290 if (req.r.rtm_family == AF_UNSPEC)
291 req.r.rtm_family = AF_INET;
292
293 if (!table_ok && cmd == RTM_NEWRULE)
294 req.r.rtm_table = RT_TABLE_MAIN;
295
Bernhard Reutner-Fischerb2908892007-04-12 11:34:39 +0000296 xrtnl_open(&rth);
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000297
298 if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
299 return 2;
300
301 return 0;
302}
303
Denis Vlasenko540a2a12007-04-07 01:14:45 +0000304/* Return value becomes exitcode. It's okay to not return at all */
Denys Vlasenko2e9b5512010-07-24 23:27:38 +0200305int FAST_FUNC do_iprule(char **argv)
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000306{
Denis Vlasenko6ca409e2007-08-12 20:58:27 +0000307 static const char ip_rule_commands[] ALIGN1 =
Denis Vlasenko990d0f62007-07-24 15:54:42 +0000308 "add\0""delete\0""list\0""show\0";
Bernhard Reutner-Fischer1b354982010-05-25 17:22:17 +0200309 if (*argv) {
Denys Vlasenko9b58fe92013-07-15 05:15:46 +0200310 int cmd = index_in_substrings(ip_rule_commands, *argv);
311 if (cmd < 0)
Denys Vlasenko0f296a32015-10-14 13:21:01 +0200312 invarg_1_to_2(*argv, applet_name);
Bernhard Reutner-Fischer1b354982010-05-25 17:22:17 +0200313 argv++;
314 if (cmd < 2)
315 return iprule_modify((cmd == 0) ? RTM_NEWRULE : RTM_DELRULE, argv);
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000316 }
Bernhard Reutner-Fischer1b354982010-05-25 17:22:17 +0200317 return iprule_list(argv);
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +0000318}