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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
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
64
65
66
67
68 printf("%u:\t", tb[RTA_PRIORITY] ?
69 *(unsigned*)RTA_DATA(tb[RTA_PRIORITY])
70 : 0);
71 printf("from ");
72 if (tb[RTA_SRC]) {
73 if (r->rtm_src_len != host_len) {
74 printf("%s/%u", rt_addr_n2a(r->rtm_family,
75 RTA_DATA(tb[RTA_SRC]),
76 abuf, sizeof(abuf)),
77 r->rtm_src_len
78 );
79 } else {
80 fputs(format_host(r->rtm_family,
81 RTA_PAYLOAD(tb[RTA_SRC]),
82 RTA_DATA(tb[RTA_SRC]),
83 abuf, sizeof(abuf)),
84 stdout
85 );
86 }
87 } else if (r->rtm_src_len) {
88 printf("0/%d", r->rtm_src_len);
89 } else {
90 printf("all");
91 }
92 bb_putchar(' ');
93
94 if (tb[RTA_DST]) {
95 if (r->rtm_dst_len != host_len) {
96 printf("to %s/%u ", rt_addr_n2a(r->rtm_family,
97 RTA_DATA(tb[RTA_DST]),
98 abuf, sizeof(abuf)),
99 r->rtm_dst_len
100 );
101 } else {
102 printf("to %s ", format_host(r->rtm_family,
103 RTA_PAYLOAD(tb[RTA_DST]),
104 RTA_DATA(tb[RTA_DST]),
105 abuf, sizeof(abuf)));
106 }
107 } else if (r->rtm_dst_len) {
108 printf("to 0/%d ", r->rtm_dst_len);
109 }
110
111 if (r->rtm_tos) {
112 printf("tos %s ", rtnl_dsfield_n2a(r->rtm_tos));
113 }
114 if (tb[RTA_PROTOINFO]) {
115 printf("fwmark %#x ", *(uint32_t*)RTA_DATA(tb[RTA_PROTOINFO]));
116 }
117
118 if (tb[RTA_IIF]) {
119 printf("iif %s ", (char*)RTA_DATA(tb[RTA_IIF]));
120 }
121
122 if (r->rtm_table)
123 printf("lookup %s ", rtnl_rttable_n2a(r->rtm_table));
124
125 if (tb[RTA_FLOW]) {
126 uint32_t to = *(uint32_t*)RTA_DATA(tb[RTA_FLOW]);
127 uint32_t from = to>>16;
128 to &= 0xFFFF;
129 if (from) {
130 printf("realms %s/",
131 rtnl_rtrealm_n2a(from));
132 }
133 printf("%s ",
134 rtnl_rtrealm_n2a(to));
135 }
136
137 if (r->rtm_type == RTN_NAT) {
138 if (tb[RTA_GATEWAY]) {
139 printf("map-to %s ",
140 format_host(r->rtm_family,
141 RTA_PAYLOAD(tb[RTA_GATEWAY]),
142 RTA_DATA(tb[RTA_GATEWAY]),
143 abuf, sizeof(abuf)));
144 } else
145 printf("masquerade");
146 } else if (r->rtm_type != RTN_UNICAST)
147 fputs(rtnl_rtntype_n2a(r->rtm_type), stdout);
148
149 bb_putchar('\n');
150
151 return 0;
152}
153
154
155static int iprule_list(char **argv)
156{
157 struct rtnl_handle rth;
158 int af = preferred_family;
159
160 if (af == AF_UNSPEC)
161 af = AF_INET;
162
163 if (*argv) {
164
165 bb_warn_ignoring_args(*argv);
166 return -1;
167 }
168
169 xrtnl_open(&rth);
170
171 xrtnl_wilddump_request(&rth, af, RTM_GETRULE);
172 xrtnl_dump_filter(&rth, print_rule, NULL);
173
174 return 0;
175}
176
177
178static int iprule_modify(int cmd, char **argv)
179{
180 static const char keywords[] ALIGN1 =
181 "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 };
189 bool table_ok = 0;
190 struct rtnl_handle rth;
191 struct {
192 struct nlmsghdr n;
193 struct rtmsg r;
194 char buf[1024];
195 } req;
196 smalluint key;
197
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
214 while (*argv) {
215 key = index_in_substrings(keywords, *argv) + 1;
216 if (key == 0)
217 invarg(*argv, applet_name);
218 if (key == ARG_from) {
219 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);
224 } else if (key == ARG_to) {
225 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);
230 } else if (key == ARG_preference ||
231 key == ARG_order ||
232 key == ARG_priority
233 ) {
234 uint32_t pref;
235 NEXT_ARG();
236 pref = get_u32(*argv, "preference");
237 addattr32(&req.n, sizeof(req), RTA_PRIORITY, pref);
238 } else if (key == ARG_tos) {
239 uint32_t tos;
240 NEXT_ARG();
241 if (rtnl_dsfield_a2n(&tos, *argv))
242 invarg(*argv, "TOS");
243 req.r.rtm_tos = tos;
244 } else if (key == ARG_fwmark) {
245 uint32_t fwmark;
246 NEXT_ARG();
247 fwmark = get_u32(*argv, "fwmark");
248 addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark);
249 } else if (key == ARG_realms) {
250 uint32_t realm;
251 NEXT_ARG();
252 if (get_rt_realms(&realm, *argv))
253 invarg(*argv, "realms");
254 addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
255 } else if (key == ARG_table ||
256 key == ARG_lookup
257 ) {
258 uint32_t tid;
259 NEXT_ARG();
260 if (rtnl_rttable_a2n(&tid, *argv))
261 invarg(*argv, "table ID");
262 req.r.rtm_table = tid;
263 table_ok = 1;
264 } else if (key == ARG_dev ||
265 key == ARG_iif
266 ) {
267 NEXT_ARG();
268 addattr_l(&req.n, sizeof(req), RTA_IIF, *argv, strlen(*argv)+1);
269 } else if (key == ARG_nat ||
270 key == ARG_map_to
271 ) {
272 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
278 if (key == ARG_type) {
279 NEXT_ARG();
280 }
281 if (key == ARG_help)
282 bb_show_usage();
283 if (rtnl_rtntype_a2n(&type, *argv))
284 invarg(*argv, "type");
285 req.r.rtm_type = type;
286 }
287 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
296 xrtnl_open(&rth);
297
298 if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
299 return 2;
300
301 return 0;
302}
303
304
305int FAST_FUNC do_iprule(char **argv)
306{
307 static const char ip_rule_commands[] ALIGN1 =
308 "add\0""delete\0""list\0""show\0";
309 if (*argv) {
310 int cmd = index_in_substrings(ip_rule_commands, *argv);
311 if (cmd < 0)
312 invarg(*argv, applet_name);
313 argv++;
314 if (cmd < 2)
315 return iprule_modify((cmd == 0) ? RTM_NEWRULE : RTM_DELRULE, argv);
316 }
317 return iprule_list(argv);
318}
319
