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path: root/networking/libiproute/iprule.c (plain)
blob: c486834b073746ccd137f69967af24e0dc54a874
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
48 if (n->nlmsg_type != RTM_NEWRULE)
49 return 0;
50
51 len -= NLMSG_LENGTH(sizeof(*r));
52 if (len < 0)
53 return -1;
54
55 memset(tb, 0, sizeof(tb));
56 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
57
58 if (r->rtm_family == AF_INET)
59 host_len = 32;
60 else if (r->rtm_family == AF_INET6)
61 host_len = 128;
62/* else if (r->rtm_family == AF_DECnet)
63 host_len = 16;
64 else if (r->rtm_family == AF_IPX)
65 host_len = 80;
66*/
67 printf("%u:\t", tb[RTA_PRIORITY] ?
68 *(unsigned*)RTA_DATA(tb[RTA_PRIORITY])
69 : 0);
70 printf("from ");
71 if (tb[RTA_SRC]) {
72 if (r->rtm_src_len != host_len) {
73 printf("%s/%u",
74 rt_addr_n2a(r->rtm_family, RTA_DATA(tb[RTA_SRC])),
75 r->rtm_src_len
76 );
77 } else {
78 fputs(format_host(r->rtm_family,
79 RTA_PAYLOAD(tb[RTA_SRC]),
80 RTA_DATA(tb[RTA_SRC])),
81 stdout
82 );
83 }
84 } else if (r->rtm_src_len) {
85 printf("0/%d", r->rtm_src_len);
86 } else {
87 printf("all");
88 }
89 bb_putchar(' ');
90
91 if (tb[RTA_DST]) {
92 if (r->rtm_dst_len != host_len) {
93 printf("to %s/%u ", rt_addr_n2a(r->rtm_family,
94 RTA_DATA(tb[RTA_DST])),
95 r->rtm_dst_len
96 );
97 } else {
98 printf("to %s ", format_host(r->rtm_family,
99 RTA_PAYLOAD(tb[RTA_DST]),
100 RTA_DATA(tb[RTA_DST])));
101 }
102 } else if (r->rtm_dst_len) {
103 printf("to 0/%d ", r->rtm_dst_len);
104 }
105
106 if (r->rtm_tos) {
107 printf("tos %s ", rtnl_dsfield_n2a(r->rtm_tos));
108 }
109 if (tb[RTA_PROTOINFO]) {
110 printf("fwmark %#x ", *(uint32_t*)RTA_DATA(tb[RTA_PROTOINFO]));
111 }
112
113 if (tb[RTA_IIF]) {
114 printf("iif %s ", (char*)RTA_DATA(tb[RTA_IIF]));
115 }
116
117 if (r->rtm_table)
118 printf("lookup %s ", rtnl_rttable_n2a(r->rtm_table));
119
120 if (tb[RTA_FLOW]) {
121 uint32_t to = *(uint32_t*)RTA_DATA(tb[RTA_FLOW]);
122 uint32_t from = to>>16;
123 to &= 0xFFFF;
124 if (from) {
125 printf("realms %s/",
126 rtnl_rtrealm_n2a(from));
127 }
128 printf("%s ",
129 rtnl_rtrealm_n2a(to));
130 }
131
132 if (r->rtm_type == RTN_NAT) {
133 if (tb[RTA_GATEWAY]) {
134 printf("map-to %s ",
135 format_host(r->rtm_family,
136 RTA_PAYLOAD(tb[RTA_GATEWAY]),
137 RTA_DATA(tb[RTA_GATEWAY]))
138 );
139 } else
140 printf("masquerade");
141 } else if (r->rtm_type != RTN_UNICAST)
142 fputs(rtnl_rtntype_n2a(r->rtm_type), stdout);
143
144 bb_putchar('\n');
145 /*fflush_all();*/
146 return 0;
147}
148
149/* Return value becomes exitcode. It's okay to not return at all */
150static int iprule_list(char **argv)
151{
152 struct rtnl_handle rth;
153 int af = preferred_family;
154
155 if (af == AF_UNSPEC)
156 af = AF_INET;
157
158 if (*argv) {
159 //bb_error_msg("\"rule show\" needs no arguments");
160 bb_warn_ignoring_args(*argv);
161 return -1;
162 }
163
164 xrtnl_open(&rth);
165
166 xrtnl_wilddump_request(&rth, af, RTM_GETRULE);
167 xrtnl_dump_filter(&rth, print_rule, NULL);
168
169 return 0;
170}
171
172/* Return value becomes exitcode. It's okay to not return at all */
173static int iprule_modify(int cmd, char **argv)
174{
175 static const char keywords[] ALIGN1 =
176 "from\0""to\0""preference\0""order\0""priority\0"
177 "tos\0""fwmark\0""realms\0""table\0""lookup\0""dev\0"
178 "iif\0""nat\0""map-to\0""type\0""help\0";
179 enum {
180 ARG_from = 1, ARG_to, ARG_preference, ARG_order, ARG_priority,
181 ARG_tos, ARG_fwmark, ARG_realms, ARG_table, ARG_lookup, ARG_dev,
182 ARG_iif, ARG_nat, ARG_map_to, ARG_type, ARG_help
183 };
184 bool table_ok = 0;
185 struct rtnl_handle rth;
186 struct {
187 struct nlmsghdr n;
188 struct rtmsg r;
189 char buf[1024];
190 } req;
191 smalluint key;
192
193 memset(&req, 0, sizeof(req));
194
195 req.n.nlmsg_type = cmd;
196 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
197 req.n.nlmsg_flags = NLM_F_REQUEST;
198 req.r.rtm_family = preferred_family;
199 req.r.rtm_protocol = RTPROT_BOOT;
200 if (RT_SCOPE_UNIVERSE != 0)
201 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
202 /*req.r.rtm_table = 0; - already is */
203 if (RTN_UNSPEC != 0)
204 req.r.rtm_type = RTN_UNSPEC;
205
206 if (cmd == RTM_NEWRULE) {
207 req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
208 req.r.rtm_type = RTN_UNICAST;
209 }
210
211 while (*argv) {
212 key = index_in_substrings(keywords, *argv) + 1;
213 if (key == 0) /* no match found in keywords array, bail out. */
214 invarg_1_to_2(*argv, applet_name);
215 if (key == ARG_from) {
216 inet_prefix dst;
217 NEXT_ARG();
218 get_prefix(&dst, *argv, req.r.rtm_family);
219 req.r.rtm_src_len = dst.bitlen;
220 addattr_l(&req.n, sizeof(req), RTA_SRC, &dst.data, dst.bytelen);
221 } else if (key == ARG_to) {
222 inet_prefix dst;
223 NEXT_ARG();
224 get_prefix(&dst, *argv, req.r.rtm_family);
225 req.r.rtm_dst_len = dst.bitlen;
226 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
227 } else if (key == ARG_preference ||
228 key == ARG_order ||
229 key == ARG_priority
230 ) {
231 uint32_t pref;
232 NEXT_ARG();
233 pref = get_u32(*argv, "preference");
234 addattr32(&req.n, sizeof(req), RTA_PRIORITY, pref);
235 } else if (key == ARG_tos) {
236 uint32_t tos;
237 NEXT_ARG();
238 if (rtnl_dsfield_a2n(&tos, *argv))
239 invarg_1_to_2(*argv, "TOS");
240 req.r.rtm_tos = tos;
241 } else if (key == ARG_fwmark) {
242 uint32_t fwmark;
243 NEXT_ARG();
244 fwmark = get_u32(*argv, "fwmark");
245 addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark);
246 } else if (key == ARG_realms) {
247 uint32_t realm;
248 NEXT_ARG();
249 if (get_rt_realms(&realm, *argv))
250 invarg_1_to_2(*argv, "realms");
251 addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
252 } else if (key == ARG_table ||
253 key == ARG_lookup
254 ) {
255 uint32_t tid;
256 NEXT_ARG();
257 if (rtnl_rttable_a2n(&tid, *argv))
258 invarg_1_to_2(*argv, "table ID");
259 req.r.rtm_table = tid;
260 table_ok = 1;
261 } else if (key == ARG_dev ||
262 key == ARG_iif
263 ) {
264 NEXT_ARG();
265 addattr_l(&req.n, sizeof(req), RTA_IIF, *argv, strlen(*argv)+1);
266 } else if (key == ARG_nat ||
267 key == ARG_map_to
268 ) {
269 NEXT_ARG();
270 addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv));
271 req.r.rtm_type = RTN_NAT;
272 } else {
273 int type;
274
275 if (key == ARG_type) {
276 NEXT_ARG();
277 }
278 if (key == ARG_help)
279 bb_show_usage();
280 if (rtnl_rtntype_a2n(&type, *argv))
281 invarg_1_to_2(*argv, "type");
282 req.r.rtm_type = type;
283 }
284 argv++;
285 }
286
287 if (req.r.rtm_family == AF_UNSPEC)
288 req.r.rtm_family = AF_INET;
289
290 if (!table_ok && cmd == RTM_NEWRULE)
291 req.r.rtm_table = RT_TABLE_MAIN;
292
293 xrtnl_open(&rth);
294
295 if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
296 return 2;
297
298 return 0;
299}
300
301/* Return value becomes exitcode. It's okay to not return at all */
302int FAST_FUNC do_iprule(char **argv)
303{
304 static const char ip_rule_commands[] ALIGN1 =
305 "add\0""delete\0""list\0""show\0";
306 if (*argv) {
307 int cmd = index_in_substrings(ip_rule_commands, *argv);
308 if (cmd < 0)
309 invarg_1_to_2(*argv, applet_name);
310 argv++;
311 if (cmd < 2)
312 return iprule_modify((cmd == 0) ? RTM_NEWRULE : RTM_DELRULE, argv);
313 }
314 return iprule_list(argv);
315}
316
generated by cgit at 2024-05-16 00:52:45 (GMT)