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16#include <netinet/in.h>
17#include <netinet/ip.h>
18#include <arpa/inet.h>
19
20#include "ip_common.h"
21#include "rt_names.h"
22#include "utils.h"
23
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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
65
66
67
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)),
85 stdout
86 );
87 }
88 } else if (r->rtm_src_len) {
89 printf("0/%d", r->rtm_src_len);
90 } else {
91 printf("all");
92 }
93 bb_putchar(' ');
94
95 if (tb[RTA_DST]) {
96 if (r->rtm_dst_len != host_len) {
97 printf("to %s/%u ", rt_addr_n2a(r->rtm_family,
98 RTA_DATA(tb[RTA_DST]),
99 abuf, sizeof(abuf)),
100 r->rtm_dst_len
101 );
102 } else {
103 printf("to %s ", format_host(r->rtm_family,
104 RTA_PAYLOAD(tb[RTA_DST]),
105 RTA_DATA(tb[RTA_DST]),
106 abuf, sizeof(abuf)));
107 }
108 } else if (r->rtm_dst_len) {
109 printf("to 0/%d ", r->rtm_dst_len);
110 }
111
112 if (r->rtm_tos) {
113 printf("tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1));
114 }
115 if (tb[RTA_PROTOINFO]) {
116 printf("fwmark %#x ", *(uint32_t*)RTA_DATA(tb[RTA_PROTOINFO]));
117 }
118
119 if (tb[RTA_IIF]) {
120 printf("iif %s ", (char*)RTA_DATA(tb[RTA_IIF]));
121 }
122
123 if (r->rtm_table)
124 printf("lookup %s ", rtnl_rttable_n2a(r->rtm_table, b1));
125
126 if (tb[RTA_FLOW]) {
127 uint32_t to = *(uint32_t*)RTA_DATA(tb[RTA_FLOW]);
128 uint32_t from = to>>16;
129 to &= 0xFFFF;
130 if (from) {
131 printf("realms %s/",
132 rtnl_rtrealm_n2a(from, b1));
133 }
134 printf("%s ",
135 rtnl_rtrealm_n2a(to, b1));
136 }
137
138 if (r->rtm_type == RTN_NAT) {
139 if (tb[RTA_GATEWAY]) {
140 printf("map-to %s ",
141 format_host(r->rtm_family,
142 RTA_PAYLOAD(tb[RTA_GATEWAY]),
143 RTA_DATA(tb[RTA_GATEWAY]),
144 abuf, sizeof(abuf)));
145 } else
146 printf("masquerade");
147 } else if (r->rtm_type != RTN_UNICAST)
148 fputs(rtnl_rtntype_n2a(r->rtm_type, b1), stdout);
149
150 bb_putchar('\n');
151
152 return 0;
153}
154
155
156static int iprule_list(char **argv)
157{
158 struct rtnl_handle rth;
159 int af = preferred_family;
160
161 if (af == AF_UNSPEC)
162 af = AF_INET;
163
164 if (*argv) {
165
166 bb_warn_ignoring_args(*argv);
167 return -1;
168 }
169
170 xrtnl_open(&rth);
171
172 xrtnl_wilddump_request(&rth, af, RTM_GETRULE);
173 xrtnl_dump_filter(&rth, print_rule, NULL);
174
175 return 0;
176}
177
178
179static int iprule_modify(int cmd, char **argv)
180{
181 static const char keywords[] ALIGN1 =
182 "from\0""to\0""preference\0""order\0""priority\0"
183 "tos\0""fwmark\0""realms\0""table\0""lookup\0""dev\0"
184 "iif\0""nat\0""map-to\0""type\0""help\0";
185 enum {
186 ARG_from = 1, ARG_to, ARG_preference, ARG_order, ARG_priority,
187 ARG_tos, ARG_fwmark, ARG_realms, ARG_table, ARG_lookup, ARG_dev,
188 ARG_iif, ARG_nat, ARG_map_to, ARG_type, ARG_help
189 };
190 bool table_ok = 0;
191 struct rtnl_handle rth;
192 struct {
193 struct nlmsghdr n;
194 struct rtmsg r;
195 char buf[1024];
196 } req;
197 smalluint key;
198
199 memset(&req, 0, sizeof(req));
200
201 req.n.nlmsg_type = cmd;
202 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
203 req.n.nlmsg_flags = NLM_F_REQUEST;
204 req.r.rtm_family = preferred_family;
205 req.r.rtm_protocol = RTPROT_BOOT;
206 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
207 req.r.rtm_table = 0;
208 req.r.rtm_type = RTN_UNSPEC;
209
210 if (cmd == RTM_NEWRULE) {
211 req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
212 req.r.rtm_type = RTN_UNICAST;
213 }
214
215 while (*argv) {
216 key = index_in_substrings(keywords, *argv) + 1;
217 if (key == 0)
218 bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
219 if (key == ARG_from) {
220 inet_prefix dst;
221 NEXT_ARG();
222 get_prefix(&dst, *argv, req.r.rtm_family);
223 req.r.rtm_src_len = dst.bitlen;
224 addattr_l(&req.n, sizeof(req), RTA_SRC, &dst.data, dst.bytelen);
225 } else if (key == ARG_to) {
226 inet_prefix dst;
227 NEXT_ARG();
228 get_prefix(&dst, *argv, req.r.rtm_family);
229 req.r.rtm_dst_len = dst.bitlen;
230 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
231 } else if (key == ARG_preference ||
232 key == ARG_order ||
233 key == ARG_priority
234 ) {
235 uint32_t pref;
236 NEXT_ARG();
237 pref = get_u32(*argv, "preference");
238 addattr32(&req.n, sizeof(req), RTA_PRIORITY, pref);
239 } else if (key == ARG_tos) {
240 uint32_t tos;
241 NEXT_ARG();
242 if (rtnl_dsfield_a2n(&tos, *argv))
243 invarg(*argv, "TOS");
244 req.r.rtm_tos = tos;
245 } else if (key == ARG_fwmark) {
246 uint32_t fwmark;
247 NEXT_ARG();
248 fwmark = get_u32(*argv, "fwmark");
249 addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark);
250 } else if (key == ARG_realms) {
251 uint32_t realm;
252 NEXT_ARG();
253 if (get_rt_realms(&realm, *argv))
254 invarg(*argv, "realms");
255 addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
256 } else if (key == ARG_table ||
257 key == ARG_lookup
258 ) {
259 uint32_t tid;
260 NEXT_ARG();
261 if (rtnl_rttable_a2n(&tid, *argv))
262 invarg(*argv, "table ID");
263 req.r.rtm_table = tid;
264 table_ok = 1;
265 } else if (key == ARG_dev ||
266 key == ARG_iif
267 ) {
268 NEXT_ARG();
269 addattr_l(&req.n, sizeof(req), RTA_IIF, *argv, strlen(*argv)+1);
270 } else if (key == ARG_nat ||
271 key == ARG_map_to
272 ) {
273 NEXT_ARG();
274 addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv));
275 req.r.rtm_type = RTN_NAT;
276 } else {
277 int type;
278
279 if (key == ARG_type) {
280 NEXT_ARG();
281 }
282 if (key == ARG_help)
283 bb_show_usage();
284 if (rtnl_rtntype_a2n(&type, *argv))
285 invarg(*argv, "type");
286 req.r.rtm_type = type;
287 }
288 argv++;
289 }
290
291 if (req.r.rtm_family == AF_UNSPEC)
292 req.r.rtm_family = AF_INET;
293
294 if (!table_ok && cmd == RTM_NEWRULE)
295 req.r.rtm_table = RT_TABLE_MAIN;
296
297 xrtnl_open(&rth);
298
299 if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
300 return 2;
301
302 return 0;
303}
304
305
306int FAST_FUNC do_iprule(char **argv)
307{
308 static const char ip_rule_commands[] ALIGN1 =
309 "add\0""delete\0""list\0""show\0";
310 if (*argv) {
311 smalluint cmd = index_in_substrings(ip_rule_commands, *argv);
312 if (cmd > 3)
313 bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
314 argv++;
315 if (cmd < 2)
316 return iprule_modify((cmd == 0) ? RTM_NEWRULE : RTM_DELRULE, argv);
317 }
318 return iprule_list(argv);
319}
320
