1 /* vi: set sw=4 ts=4: */
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.
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
12 * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
13 * initially integrated into busybox by Bernhard Reutner-Fischer
15 #include <netinet/in.h>
16 #include <netinet/ip.h>
17 #include <arpa/inet.h>
19 /* from <linux/fib_rules.h>: */
20 #define FRA_SUPPRESS_IFGROUP 13
21 #define FRA_SUPPRESS_PREFIXLEN 14
23 #include "ip_common.h" /* #include "libbb.h" is inside */
27 #include <linux/version.h>
28 /* RTA_TABLE is not a define, can't test with ifdef. */
29 /* As a proxy, test which kernels toolchain expects: */
30 #define HAVE_RTA_TABLE (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19))
32 /* If you add stuff here, update iprule_full_usage */
33 static const char keywords[] ALIGN1 =
34 "from\0""to\0""preference\0""order\0""priority\0"
35 "tos\0""fwmark\0""realms\0""table\0""lookup\0"
36 "suppress_prefixlength\0""suppress_ifgroup\0"
37 "dev\0""iif\0""nat\0""map-to\0""type\0""help\0"
39 #define keyword_preference (keywords + sizeof("from") + sizeof("to"))
40 #define keyword_fwmark (keyword_preference + sizeof("preference") + sizeof("order") + sizeof("priority") + sizeof("tos"))
41 #define keyword_realms (keyword_fwmark + sizeof("fwmark"))
42 #define keyword_suppress_prefixlength (keyword_realms + sizeof("realms") + sizeof("table") + sizeof("lookup"))
43 #define keyword_suppress_ifgroup (keyword_suppress_prefixlength + sizeof("suppress_prefixlength"))
45 ARG_from = 1, ARG_to, ARG_preference, ARG_order, ARG_priority,
46 ARG_tos, ARG_fwmark, ARG_realms, ARG_table, ARG_lookup,
47 ARG_suppress_prefixlength, ARG_suppress_ifgroup,
48 ARG_dev, ARG_iif, ARG_nat, ARG_map_to, ARG_type, ARG_help,
51 static int FAST_FUNC print_rule(const struct sockaddr_nl *who UNUSED_PARAM,
52 struct nlmsghdr *n, void *arg UNUSED_PARAM)
54 struct rtmsg *r = NLMSG_DATA(n);
55 int len = n->nlmsg_len;
57 struct rtattr * tb[RTA_MAX+1];
59 if (n->nlmsg_type != RTM_NEWRULE)
62 len -= NLMSG_LENGTH(sizeof(*r));
66 memset(tb, 0, sizeof(tb));
67 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
69 if (r->rtm_family == AF_INET)
71 else if (r->rtm_family == AF_INET6)
73 /* else if (r->rtm_family == AF_DECnet)
75 else if (r->rtm_family == AF_IPX)
78 printf("%u:\t", tb[RTA_PRIORITY] ?
79 *(unsigned*)RTA_DATA(tb[RTA_PRIORITY])
83 if (r->rtm_src_len != host_len) {
85 rt_addr_n2a(r->rtm_family, RTA_DATA(tb[RTA_SRC])),
89 fputs(format_host(r->rtm_family,
90 RTA_PAYLOAD(tb[RTA_SRC]),
91 RTA_DATA(tb[RTA_SRC])),
95 } else if (r->rtm_src_len) {
96 printf("0/%d", r->rtm_src_len);
103 if (r->rtm_dst_len != host_len) {
104 printf("to %s/%u ", rt_addr_n2a(r->rtm_family,
105 RTA_DATA(tb[RTA_DST])),
109 printf("to %s ", format_host(r->rtm_family,
110 RTA_PAYLOAD(tb[RTA_DST]),
111 RTA_DATA(tb[RTA_DST])));
113 } else if (r->rtm_dst_len) {
114 printf("to 0/%d ", r->rtm_dst_len);
118 printf("tos %s ", rtnl_dsfield_n2a(r->rtm_tos));
120 if (tb[RTA_PROTOINFO]) {
121 printf("fwmark %#x ", *(uint32_t*)RTA_DATA(tb[RTA_PROTOINFO]));
125 printf("iif %s ", (char*)RTA_DATA(tb[RTA_IIF]));
130 printf("lookup %s ", rtnl_rttable_n2a(*(uint32_t*)RTA_DATA(tb[RTA_TABLE])));
134 printf("lookup %s ", rtnl_rttable_n2a(r->rtm_table));
136 if (tb[FRA_SUPPRESS_PREFIXLEN]) {
137 int pl = *(uint32_t*)RTA_DATA(tb[FRA_SUPPRESS_PREFIXLEN]);
139 printf("%s %d ", keyword_suppress_prefixlength, pl);
141 if (tb[FRA_SUPPRESS_IFGROUP]) {
142 int grp = *(uint32_t*)RTA_DATA(tb[FRA_SUPPRESS_IFGROUP]);
144 printf("%s %d ", keyword_suppress_ifgroup, grp);
148 uint32_t to = *(uint32_t*)RTA_DATA(tb[RTA_FLOW]);
149 uint32_t from = to>>16;
153 rtnl_rtrealm_n2a(from));
156 rtnl_rtrealm_n2a(to));
159 if (r->rtm_type == RTN_NAT) {
160 if (tb[RTA_GATEWAY]) {
162 format_host(r->rtm_family,
163 RTA_PAYLOAD(tb[RTA_GATEWAY]),
164 RTA_DATA(tb[RTA_GATEWAY]))
167 printf("masquerade");
168 } else if (r->rtm_type != RTN_UNICAST)
169 fputs(rtnl_rtntype_n2a(r->rtm_type), stdout);
176 /* Return value becomes exitcode. It's okay to not return at all */
177 static int iprule_list(char **argv)
179 struct rtnl_handle rth;
180 int af = preferred_family;
186 //bb_error_msg("\"rule show\" needs no arguments");
187 bb_warn_ignoring_args(*argv);
193 xrtnl_wilddump_request(&rth, af, RTM_GETRULE);
194 xrtnl_dump_filter(&rth, print_rule, NULL);
199 /* Return value becomes exitcode. It's okay to not return at all */
200 static int iprule_modify(int cmd, char **argv)
203 struct rtnl_handle rth;
211 memset(&req, 0, sizeof(req));
213 req.n.nlmsg_type = cmd;
214 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
215 req.n.nlmsg_flags = NLM_F_REQUEST;
216 req.r.rtm_family = preferred_family;
217 req.r.rtm_protocol = RTPROT_BOOT;
218 if (RT_SCOPE_UNIVERSE != 0)
219 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
220 /*req.r.rtm_table = 0; - already is */
222 req.r.rtm_type = RTN_UNSPEC;
224 if (cmd == RTM_NEWRULE) {
225 req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
226 req.r.rtm_type = RTN_UNICAST;
230 key = index_in_substrings(keywords, *argv) + 1;
231 if (key == 0) /* no match found in keywords array, bail out. */
232 invarg_1_to_2(*argv, applet_name);
233 if (key == ARG_from) {
236 get_prefix(&dst, *argv, req.r.rtm_family);
237 req.r.rtm_src_len = dst.bitlen;
238 addattr_l(&req.n, sizeof(req), RTA_SRC, &dst.data, dst.bytelen);
239 } else if (key == ARG_to) {
242 get_prefix(&dst, *argv, req.r.rtm_family);
243 req.r.rtm_dst_len = dst.bitlen;
244 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
245 } else if (key == ARG_preference ||
251 pref = get_u32(*argv, keyword_preference);
252 addattr32(&req.n, sizeof(req), RTA_PRIORITY, pref);
253 } else if (key == ARG_tos) {
256 if (rtnl_dsfield_a2n(&tos, *argv))
257 invarg_1_to_2(*argv, "TOS");
259 } else if (key == ARG_fwmark) {
262 fwmark = get_u32(*argv, keyword_fwmark);
263 addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark);
264 } else if (key == ARG_realms) {
267 if (get_rt_realms(&realm, *argv))
268 invarg_1_to_2(*argv, keyword_realms);
269 addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
270 } else if (key == ARG_table ||
275 if (rtnl_rttable_a2n(&tid, *argv))
276 invarg_1_to_2(*argv, "table ID");
280 req.r.rtm_table = RT_TABLE_UNSPEC;
281 addattr32(&req.n, sizeof(req), RTA_TABLE, tid);
284 req.r.rtm_table = tid;
287 } else if (key == ARG_suppress_prefixlength) {
290 prefix_length = get_u32(*argv, keyword_suppress_prefixlength);
291 addattr32(&req.n, sizeof(req), FRA_SUPPRESS_PREFIXLEN, prefix_length);
292 } else if (key == ARG_suppress_ifgroup) {
295 grp = get_u32(*argv, keyword_suppress_ifgroup);
296 addattr32(&req.n, sizeof(req), FRA_SUPPRESS_IFGROUP, grp);
297 } else if (key == ARG_dev ||
301 addattr_l(&req.n, sizeof(req), RTA_IIF, *argv, strlen(*argv)+1);
302 } else if (key == ARG_nat ||
306 addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv));
307 req.r.rtm_type = RTN_NAT;
311 if (key == ARG_type) {
316 if (rtnl_rtntype_a2n(&type, *argv))
317 invarg_1_to_2(*argv, "type");
318 req.r.rtm_type = type;
323 if (req.r.rtm_family == AF_UNSPEC)
324 req.r.rtm_family = AF_INET;
326 if (!table_ok && cmd == RTM_NEWRULE)
327 req.r.rtm_table = RT_TABLE_MAIN;
331 if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
337 /* Return value becomes exitcode. It's okay to not return at all */
338 int FAST_FUNC do_iprule(char **argv)
340 static const char ip_rule_commands[] ALIGN1 =
341 "add\0""delete\0""list\0""show\0";
343 int cmd = index_in_substrings(ip_rule_commands, *argv);
345 invarg_1_to_2(*argv, applet_name);
348 return iprule_modify((cmd == 0) ? RTM_NEWRULE : RTM_DELRULE, argv);
350 return iprule_list(argv);