1 | /* vi: set sw=4 ts=4: */
|
---|
2 | /*
|
---|
3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
---|
4 | *
|
---|
5 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
|
---|
6 | *
|
---|
7 | * Changes:
|
---|
8 | *
|
---|
9 | * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
|
---|
10 | * Kunihiro Ishiguro <kunihiro@zebra.org> 001102: rtnh_ifindex was not initialized
|
---|
11 | */
|
---|
12 |
|
---|
13 | #include "ip_common.h" /* #include "libbb.h" is inside */
|
---|
14 | #include "rt_names.h"
|
---|
15 | #include "utils.h"
|
---|
16 |
|
---|
17 | #ifndef RTAX_RTTVAR
|
---|
18 | #define RTAX_RTTVAR RTAX_HOPS
|
---|
19 | #endif
|
---|
20 |
|
---|
21 |
|
---|
22 | struct filter_t {
|
---|
23 | int tb;
|
---|
24 | smallint flushed;
|
---|
25 | char *flushb;
|
---|
26 | int flushp;
|
---|
27 | int flushe;
|
---|
28 | struct rtnl_handle *rth;
|
---|
29 | //int protocol, protocolmask; - write-only fields?!
|
---|
30 | //int scope, scopemask; - unused
|
---|
31 | //int type; - read-only
|
---|
32 | //int typemask; - unused
|
---|
33 | //int tos, tosmask; - unused
|
---|
34 | int iif, iifmask;
|
---|
35 | int oif, oifmask;
|
---|
36 | //int realm, realmmask; - unused
|
---|
37 | //inet_prefix rprefsrc; - read-only
|
---|
38 | inet_prefix rvia;
|
---|
39 | inet_prefix rdst;
|
---|
40 | inet_prefix mdst;
|
---|
41 | inet_prefix rsrc;
|
---|
42 | inet_prefix msrc;
|
---|
43 | } FIX_ALIASING;
|
---|
44 | typedef struct filter_t filter_t;
|
---|
45 |
|
---|
46 | #define G_filter (*(filter_t*)&bb_common_bufsiz1)
|
---|
47 |
|
---|
48 | static int flush_update(void)
|
---|
49 | {
|
---|
50 | if (rtnl_send(G_filter.rth, G_filter.flushb, G_filter.flushp) < 0) {
|
---|
51 | bb_perror_msg("can't send flush request");
|
---|
52 | return -1;
|
---|
53 | }
|
---|
54 | G_filter.flushp = 0;
|
---|
55 | return 0;
|
---|
56 | }
|
---|
57 |
|
---|
58 | static unsigned get_hz(void)
|
---|
59 | {
|
---|
60 | static unsigned hz_internal;
|
---|
61 | FILE *fp;
|
---|
62 |
|
---|
63 | if (hz_internal)
|
---|
64 | return hz_internal;
|
---|
65 |
|
---|
66 | fp = fopen_for_read("/proc/net/psched");
|
---|
67 | if (fp) {
|
---|
68 | unsigned nom, denom;
|
---|
69 |
|
---|
70 | if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
|
---|
71 | if (nom == 1000000)
|
---|
72 | hz_internal = denom;
|
---|
73 | fclose(fp);
|
---|
74 | }
|
---|
75 | if (!hz_internal)
|
---|
76 | hz_internal = sysconf(_SC_CLK_TCK);
|
---|
77 | return hz_internal;
|
---|
78 | }
|
---|
79 |
|
---|
80 | static int FAST_FUNC print_route(const struct sockaddr_nl *who UNUSED_PARAM,
|
---|
81 | struct nlmsghdr *n, void *arg UNUSED_PARAM)
|
---|
82 | {
|
---|
83 | struct rtmsg *r = NLMSG_DATA(n);
|
---|
84 | int len = n->nlmsg_len;
|
---|
85 | struct rtattr * tb[RTA_MAX+1];
|
---|
86 | char abuf[256];
|
---|
87 | inet_prefix dst;
|
---|
88 | inet_prefix src;
|
---|
89 | int host_len = -1;
|
---|
90 | SPRINT_BUF(b1);
|
---|
91 |
|
---|
92 | if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) {
|
---|
93 | fprintf(stderr, "Not a route: %08x %08x %08x\n",
|
---|
94 | n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
|
---|
95 | return 0;
|
---|
96 | }
|
---|
97 | if (G_filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
|
---|
98 | return 0;
|
---|
99 | len -= NLMSG_LENGTH(sizeof(*r));
|
---|
100 | if (len < 0)
|
---|
101 | bb_error_msg_and_die("wrong nlmsg len %d", len);
|
---|
102 |
|
---|
103 | if (r->rtm_family == AF_INET6)
|
---|
104 | host_len = 128;
|
---|
105 | else if (r->rtm_family == AF_INET)
|
---|
106 | host_len = 32;
|
---|
107 |
|
---|
108 | if (r->rtm_family == AF_INET6) {
|
---|
109 | if (G_filter.tb) {
|
---|
110 | if (G_filter.tb < 0) {
|
---|
111 | if (!(r->rtm_flags & RTM_F_CLONED)) {
|
---|
112 | return 0;
|
---|
113 | }
|
---|
114 | } else {
|
---|
115 | if (r->rtm_flags & RTM_F_CLONED) {
|
---|
116 | return 0;
|
---|
117 | }
|
---|
118 | if (G_filter.tb == RT_TABLE_LOCAL) {
|
---|
119 | if (r->rtm_type != RTN_LOCAL) {
|
---|
120 | return 0;
|
---|
121 | }
|
---|
122 | } else if (G_filter.tb == RT_TABLE_MAIN) {
|
---|
123 | if (r->rtm_type == RTN_LOCAL) {
|
---|
124 | return 0;
|
---|
125 | }
|
---|
126 | } else {
|
---|
127 | return 0;
|
---|
128 | }
|
---|
129 | }
|
---|
130 | }
|
---|
131 | } else {
|
---|
132 | if (G_filter.tb > 0 && G_filter.tb != r->rtm_table) {
|
---|
133 | return 0;
|
---|
134 | }
|
---|
135 | }
|
---|
136 | if (G_filter.rdst.family
|
---|
137 | && (r->rtm_family != G_filter.rdst.family || G_filter.rdst.bitlen > r->rtm_dst_len)
|
---|
138 | ) {
|
---|
139 | return 0;
|
---|
140 | }
|
---|
141 | if (G_filter.mdst.family
|
---|
142 | && (r->rtm_family != G_filter.mdst.family
|
---|
143 | || (G_filter.mdst.bitlen >= 0 && G_filter.mdst.bitlen < r->rtm_dst_len)
|
---|
144 | )
|
---|
145 | ) {
|
---|
146 | return 0;
|
---|
147 | }
|
---|
148 | if (G_filter.rsrc.family
|
---|
149 | && (r->rtm_family != G_filter.rsrc.family || G_filter.rsrc.bitlen > r->rtm_src_len)
|
---|
150 | ) {
|
---|
151 | return 0;
|
---|
152 | }
|
---|
153 | if (G_filter.msrc.family
|
---|
154 | && (r->rtm_family != G_filter.msrc.family
|
---|
155 | || (G_filter.msrc.bitlen >= 0 && G_filter.msrc.bitlen < r->rtm_src_len)
|
---|
156 | )
|
---|
157 | ) {
|
---|
158 | return 0;
|
---|
159 | }
|
---|
160 |
|
---|
161 | memset(tb, 0, sizeof(tb));
|
---|
162 | parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
|
---|
163 |
|
---|
164 | if (G_filter.rdst.family
|
---|
165 | && inet_addr_match(&dst, &G_filter.rdst, G_filter.rdst.bitlen)
|
---|
166 | ) {
|
---|
167 | return 0;
|
---|
168 | }
|
---|
169 | if (G_filter.mdst.family
|
---|
170 | && G_filter.mdst.bitlen >= 0
|
---|
171 | && inet_addr_match(&dst, &G_filter.mdst, r->rtm_dst_len)
|
---|
172 | ) {
|
---|
173 | return 0;
|
---|
174 | }
|
---|
175 | if (G_filter.rsrc.family
|
---|
176 | && inet_addr_match(&src, &G_filter.rsrc, G_filter.rsrc.bitlen)
|
---|
177 | ) {
|
---|
178 | return 0;
|
---|
179 | }
|
---|
180 | if (G_filter.msrc.family && G_filter.msrc.bitlen >= 0
|
---|
181 | && inet_addr_match(&src, &G_filter.msrc, r->rtm_src_len)
|
---|
182 | ) {
|
---|
183 | return 0;
|
---|
184 | }
|
---|
185 | if (G_filter.flushb
|
---|
186 | && r->rtm_family == AF_INET6
|
---|
187 | && r->rtm_dst_len == 0
|
---|
188 | && r->rtm_type == RTN_UNREACHABLE
|
---|
189 | && tb[RTA_PRIORITY]
|
---|
190 | && *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1
|
---|
191 | ) {
|
---|
192 | return 0;
|
---|
193 | }
|
---|
194 |
|
---|
195 | if (G_filter.flushb) {
|
---|
196 | struct nlmsghdr *fn;
|
---|
197 | if (NLMSG_ALIGN(G_filter.flushp) + n->nlmsg_len > G_filter.flushe) {
|
---|
198 | if (flush_update())
|
---|
199 | bb_error_msg_and_die("flush");
|
---|
200 | }
|
---|
201 | fn = (struct nlmsghdr*)(G_filter.flushb + NLMSG_ALIGN(G_filter.flushp));
|
---|
202 | memcpy(fn, n, n->nlmsg_len);
|
---|
203 | fn->nlmsg_type = RTM_DELROUTE;
|
---|
204 | fn->nlmsg_flags = NLM_F_REQUEST;
|
---|
205 | fn->nlmsg_seq = ++G_filter.rth->seq;
|
---|
206 | G_filter.flushp = (((char*)fn) + n->nlmsg_len) - G_filter.flushb;
|
---|
207 | G_filter.flushed = 1;
|
---|
208 | return 0;
|
---|
209 | }
|
---|
210 |
|
---|
211 | if (n->nlmsg_type == RTM_DELROUTE) {
|
---|
212 | printf("Deleted ");
|
---|
213 | }
|
---|
214 | if (r->rtm_type != RTN_UNICAST /* && !G_filter.type - always 0 */) {
|
---|
215 | printf("%s ", rtnl_rtntype_n2a(r->rtm_type, b1));
|
---|
216 | }
|
---|
217 |
|
---|
218 | if (tb[RTA_DST]) {
|
---|
219 | if (r->rtm_dst_len != host_len) {
|
---|
220 | printf("%s/%u ", rt_addr_n2a(r->rtm_family,
|
---|
221 | RTA_DATA(tb[RTA_DST]),
|
---|
222 | abuf, sizeof(abuf)),
|
---|
223 | r->rtm_dst_len
|
---|
224 | );
|
---|
225 | } else {
|
---|
226 | printf("%s ", format_host(r->rtm_family,
|
---|
227 | RTA_PAYLOAD(tb[RTA_DST]),
|
---|
228 | RTA_DATA(tb[RTA_DST]),
|
---|
229 | abuf, sizeof(abuf))
|
---|
230 | );
|
---|
231 | }
|
---|
232 | } else if (r->rtm_dst_len) {
|
---|
233 | printf("0/%d ", r->rtm_dst_len);
|
---|
234 | } else {
|
---|
235 | printf("default ");
|
---|
236 | }
|
---|
237 | if (tb[RTA_SRC]) {
|
---|
238 | if (r->rtm_src_len != host_len) {
|
---|
239 | printf("from %s/%u ", rt_addr_n2a(r->rtm_family,
|
---|
240 | RTA_DATA(tb[RTA_SRC]),
|
---|
241 | abuf, sizeof(abuf)),
|
---|
242 | r->rtm_src_len
|
---|
243 | );
|
---|
244 | } else {
|
---|
245 | printf("from %s ", format_host(r->rtm_family,
|
---|
246 | RTA_PAYLOAD(tb[RTA_SRC]),
|
---|
247 | RTA_DATA(tb[RTA_SRC]),
|
---|
248 | abuf, sizeof(abuf))
|
---|
249 | );
|
---|
250 | }
|
---|
251 | } else if (r->rtm_src_len) {
|
---|
252 | printf("from 0/%u ", r->rtm_src_len);
|
---|
253 | }
|
---|
254 | if (tb[RTA_GATEWAY] && G_filter.rvia.bitlen != host_len) {
|
---|
255 | printf("via %s ", format_host(r->rtm_family,
|
---|
256 | RTA_PAYLOAD(tb[RTA_GATEWAY]),
|
---|
257 | RTA_DATA(tb[RTA_GATEWAY]),
|
---|
258 | abuf, sizeof(abuf)));
|
---|
259 | }
|
---|
260 | if (tb[RTA_OIF] && G_filter.oifmask != -1) {
|
---|
261 | printf("dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF])));
|
---|
262 | }
|
---|
263 |
|
---|
264 | if (tb[RTA_PREFSRC] && /*G_filter.rprefsrc.bitlen - always 0*/ 0 != host_len) {
|
---|
265 | /* Do not use format_host(). It is our local addr
|
---|
266 | and symbolic name will not be useful.
|
---|
267 | */
|
---|
268 | printf(" src %s ", rt_addr_n2a(r->rtm_family,
|
---|
269 | RTA_DATA(tb[RTA_PREFSRC]),
|
---|
270 | abuf, sizeof(abuf)));
|
---|
271 | }
|
---|
272 | if (tb[RTA_PRIORITY]) {
|
---|
273 | printf(" metric %d ", *(uint32_t*)RTA_DATA(tb[RTA_PRIORITY]));
|
---|
274 | }
|
---|
275 | if (r->rtm_family == AF_INET6) {
|
---|
276 | struct rta_cacheinfo *ci = NULL;
|
---|
277 | if (tb[RTA_CACHEINFO]) {
|
---|
278 | ci = RTA_DATA(tb[RTA_CACHEINFO]);
|
---|
279 | }
|
---|
280 | if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) {
|
---|
281 | if (r->rtm_flags & RTM_F_CLONED) {
|
---|
282 | printf("%c cache ", _SL_);
|
---|
283 | }
|
---|
284 | if (ci->rta_expires) {
|
---|
285 | printf(" expires %dsec", ci->rta_expires / get_hz());
|
---|
286 | }
|
---|
287 | if (ci->rta_error != 0) {
|
---|
288 | printf(" error %d", ci->rta_error);
|
---|
289 | }
|
---|
290 | } else if (ci) {
|
---|
291 | if (ci->rta_error != 0)
|
---|
292 | printf(" error %d", ci->rta_error);
|
---|
293 | }
|
---|
294 | }
|
---|
295 | if (tb[RTA_IIF] && G_filter.iifmask != -1) {
|
---|
296 | printf(" iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF])));
|
---|
297 | }
|
---|
298 | bb_putchar('\n');
|
---|
299 | return 0;
|
---|
300 | }
|
---|
301 |
|
---|
302 | /* Return value becomes exitcode. It's okay to not return at all */
|
---|
303 | static int iproute_modify(int cmd, unsigned flags, char **argv)
|
---|
304 | {
|
---|
305 | static const char keywords[] ALIGN1 =
|
---|
306 | "src\0""via\0""mtu\0""lock\0""protocol\0"IF_FEATURE_IP_RULE("table\0")
|
---|
307 | "dev\0""oif\0""to\0""metric\0";
|
---|
308 | enum {
|
---|
309 | ARG_src,
|
---|
310 | ARG_via,
|
---|
311 | ARG_mtu, PARM_lock,
|
---|
312 | ARG_protocol,
|
---|
313 | IF_FEATURE_IP_RULE(ARG_table,)
|
---|
314 | ARG_dev,
|
---|
315 | ARG_oif,
|
---|
316 | ARG_to,
|
---|
317 | ARG_metric,
|
---|
318 | };
|
---|
319 | enum {
|
---|
320 | gw_ok = 1 << 0,
|
---|
321 | dst_ok = 1 << 1,
|
---|
322 | proto_ok = 1 << 2,
|
---|
323 | type_ok = 1 << 3
|
---|
324 | };
|
---|
325 | struct rtnl_handle rth;
|
---|
326 | struct {
|
---|
327 | struct nlmsghdr n;
|
---|
328 | struct rtmsg r;
|
---|
329 | char buf[1024];
|
---|
330 | } req;
|
---|
331 | char mxbuf[256];
|
---|
332 | struct rtattr * mxrta = (void*)mxbuf;
|
---|
333 | unsigned mxlock = 0;
|
---|
334 | char *d = NULL;
|
---|
335 | smalluint ok = 0;
|
---|
336 | int arg;
|
---|
337 |
|
---|
338 | memset(&req, 0, sizeof(req));
|
---|
339 |
|
---|
340 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
|
---|
341 | req.n.nlmsg_flags = NLM_F_REQUEST | flags;
|
---|
342 | req.n.nlmsg_type = cmd;
|
---|
343 | req.r.rtm_family = preferred_family;
|
---|
344 | if (RT_TABLE_MAIN) /* if it is zero, memset already did it */
|
---|
345 | req.r.rtm_table = RT_TABLE_MAIN;
|
---|
346 | if (RT_SCOPE_NOWHERE)
|
---|
347 | req.r.rtm_scope = RT_SCOPE_NOWHERE;
|
---|
348 |
|
---|
349 | if (cmd != RTM_DELROUTE) {
|
---|
350 | req.r.rtm_protocol = RTPROT_BOOT;
|
---|
351 | req.r.rtm_scope = RT_SCOPE_UNIVERSE;
|
---|
352 | req.r.rtm_type = RTN_UNICAST;
|
---|
353 | }
|
---|
354 |
|
---|
355 | mxrta->rta_type = RTA_METRICS;
|
---|
356 | mxrta->rta_len = RTA_LENGTH(0);
|
---|
357 |
|
---|
358 | while (*argv) {
|
---|
359 | arg = index_in_substrings(keywords, *argv);
|
---|
360 | if (arg == ARG_src) {
|
---|
361 | inet_prefix addr;
|
---|
362 | NEXT_ARG();
|
---|
363 | get_addr(&addr, *argv, req.r.rtm_family);
|
---|
364 | if (req.r.rtm_family == AF_UNSPEC)
|
---|
365 | req.r.rtm_family = addr.family;
|
---|
366 | addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
|
---|
367 | } else if (arg == ARG_via) {
|
---|
368 | inet_prefix addr;
|
---|
369 | ok |= gw_ok;
|
---|
370 | NEXT_ARG();
|
---|
371 | get_addr(&addr, *argv, req.r.rtm_family);
|
---|
372 | if (req.r.rtm_family == AF_UNSPEC) {
|
---|
373 | req.r.rtm_family = addr.family;
|
---|
374 | }
|
---|
375 | addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen);
|
---|
376 | } else if (arg == ARG_mtu) {
|
---|
377 | unsigned mtu;
|
---|
378 | NEXT_ARG();
|
---|
379 | if (index_in_strings(keywords, *argv) == PARM_lock) {
|
---|
380 | mxlock |= (1 << RTAX_MTU);
|
---|
381 | NEXT_ARG();
|
---|
382 | }
|
---|
383 | mtu = get_unsigned(*argv, "mtu");
|
---|
384 | rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
|
---|
385 | } else if (arg == ARG_protocol) {
|
---|
386 | uint32_t prot;
|
---|
387 | NEXT_ARG();
|
---|
388 | if (rtnl_rtprot_a2n(&prot, *argv))
|
---|
389 | invarg(*argv, "protocol");
|
---|
390 | req.r.rtm_protocol = prot;
|
---|
391 | ok |= proto_ok;
|
---|
392 | #if ENABLE_FEATURE_IP_RULE
|
---|
393 | } else if (arg == ARG_table) {
|
---|
394 | uint32_t tid;
|
---|
395 | NEXT_ARG();
|
---|
396 | if (rtnl_rttable_a2n(&tid, *argv))
|
---|
397 | invarg(*argv, "table");
|
---|
398 | req.r.rtm_table = tid;
|
---|
399 | #endif
|
---|
400 | } else if (arg == ARG_dev || arg == ARG_oif) {
|
---|
401 | NEXT_ARG();
|
---|
402 | d = *argv;
|
---|
403 | } else if (arg == ARG_metric) {
|
---|
404 | uint32_t metric;
|
---|
405 | NEXT_ARG();
|
---|
406 | metric = get_u32(*argv, "metric");
|
---|
407 | addattr32(&req.n, sizeof(req), RTA_PRIORITY, metric);
|
---|
408 | } else {
|
---|
409 | int type;
|
---|
410 | inet_prefix dst;
|
---|
411 |
|
---|
412 | if (arg == ARG_to) {
|
---|
413 | NEXT_ARG();
|
---|
414 | }
|
---|
415 | if ((**argv < '0' || **argv > '9')
|
---|
416 | && rtnl_rtntype_a2n(&type, *argv) == 0) {
|
---|
417 | NEXT_ARG();
|
---|
418 | req.r.rtm_type = type;
|
---|
419 | ok |= type_ok;
|
---|
420 | }
|
---|
421 |
|
---|
422 | if (ok & dst_ok) {
|
---|
423 | duparg2("to", *argv);
|
---|
424 | }
|
---|
425 | get_prefix(&dst, *argv, req.r.rtm_family);
|
---|
426 | if (req.r.rtm_family == AF_UNSPEC) {
|
---|
427 | req.r.rtm_family = dst.family;
|
---|
428 | }
|
---|
429 | req.r.rtm_dst_len = dst.bitlen;
|
---|
430 | ok |= dst_ok;
|
---|
431 | if (dst.bytelen) {
|
---|
432 | addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
|
---|
433 | }
|
---|
434 | }
|
---|
435 | argv++;
|
---|
436 | }
|
---|
437 |
|
---|
438 | xrtnl_open(&rth);
|
---|
439 |
|
---|
440 | if (d) {
|
---|
441 | int idx;
|
---|
442 |
|
---|
443 | ll_init_map(&rth);
|
---|
444 |
|
---|
445 | if (d) {
|
---|
446 | idx = xll_name_to_index(d);
|
---|
447 | addattr32(&req.n, sizeof(req), RTA_OIF, idx);
|
---|
448 | }
|
---|
449 | }
|
---|
450 |
|
---|
451 | if (mxrta->rta_len > RTA_LENGTH(0)) {
|
---|
452 | if (mxlock) {
|
---|
453 | rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
|
---|
454 | }
|
---|
455 | addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
|
---|
456 | }
|
---|
457 |
|
---|
458 | if (req.r.rtm_type == RTN_LOCAL || req.r.rtm_type == RTN_NAT)
|
---|
459 | req.r.rtm_scope = RT_SCOPE_HOST;
|
---|
460 | else
|
---|
461 | if (req.r.rtm_type == RTN_BROADCAST
|
---|
462 | || req.r.rtm_type == RTN_MULTICAST
|
---|
463 | || req.r.rtm_type == RTN_ANYCAST
|
---|
464 | ) {
|
---|
465 | req.r.rtm_scope = RT_SCOPE_LINK;
|
---|
466 | }
|
---|
467 | else if (req.r.rtm_type == RTN_UNICAST || req.r.rtm_type == RTN_UNSPEC) {
|
---|
468 | if (cmd == RTM_DELROUTE)
|
---|
469 | req.r.rtm_scope = RT_SCOPE_NOWHERE;
|
---|
470 | else if (!(ok & gw_ok))
|
---|
471 | req.r.rtm_scope = RT_SCOPE_LINK;
|
---|
472 | }
|
---|
473 |
|
---|
474 | if (req.r.rtm_family == AF_UNSPEC) {
|
---|
475 | req.r.rtm_family = AF_INET;
|
---|
476 | }
|
---|
477 |
|
---|
478 | if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) {
|
---|
479 | return 2;
|
---|
480 | }
|
---|
481 |
|
---|
482 | return 0;
|
---|
483 | }
|
---|
484 |
|
---|
485 | static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
|
---|
486 | {
|
---|
487 | struct {
|
---|
488 | struct nlmsghdr nlh;
|
---|
489 | struct rtmsg rtm;
|
---|
490 | } req;
|
---|
491 | struct sockaddr_nl nladdr;
|
---|
492 |
|
---|
493 | memset(&nladdr, 0, sizeof(nladdr));
|
---|
494 | memset(&req, 0, sizeof(req));
|
---|
495 | nladdr.nl_family = AF_NETLINK;
|
---|
496 |
|
---|
497 | req.nlh.nlmsg_len = sizeof(req);
|
---|
498 | if (RTM_GETROUTE)
|
---|
499 | req.nlh.nlmsg_type = RTM_GETROUTE;
|
---|
500 | if (NLM_F_ROOT | NLM_F_REQUEST)
|
---|
501 | req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_REQUEST;
|
---|
502 | /*req.nlh.nlmsg_pid = 0; - memset did it already */
|
---|
503 | req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
|
---|
504 | req.rtm.rtm_family = family;
|
---|
505 | if (RTM_F_CLONED)
|
---|
506 | req.rtm.rtm_flags = RTM_F_CLONED;
|
---|
507 |
|
---|
508 | return xsendto(rth->fd, (void*)&req, sizeof(req), (struct sockaddr*)&nladdr, sizeof(nladdr));
|
---|
509 | }
|
---|
510 |
|
---|
511 | static void iproute_flush_cache(void)
|
---|
512 | {
|
---|
513 | static const char fn[] ALIGN1 = "/proc/sys/net/ipv4/route/flush";
|
---|
514 | int flush_fd = open_or_warn(fn, O_WRONLY);
|
---|
515 |
|
---|
516 | if (flush_fd < 0) {
|
---|
517 | return;
|
---|
518 | }
|
---|
519 |
|
---|
520 | if (write(flush_fd, "-1", 2) < 2) {
|
---|
521 | bb_perror_msg("can't flush routing cache");
|
---|
522 | return;
|
---|
523 | }
|
---|
524 | close(flush_fd);
|
---|
525 | }
|
---|
526 |
|
---|
527 | static void iproute_reset_filter(void)
|
---|
528 | {
|
---|
529 | memset(&G_filter, 0, sizeof(G_filter));
|
---|
530 | G_filter.mdst.bitlen = -1;
|
---|
531 | G_filter.msrc.bitlen = -1;
|
---|
532 | }
|
---|
533 |
|
---|
534 | /* Return value becomes exitcode. It's okay to not return at all */
|
---|
535 | static int iproute_list_or_flush(char **argv, int flush)
|
---|
536 | {
|
---|
537 | int do_ipv6 = preferred_family;
|
---|
538 | struct rtnl_handle rth;
|
---|
539 | char *id = NULL;
|
---|
540 | char *od = NULL;
|
---|
541 | static const char keywords[] ALIGN1 =
|
---|
542 | /* "ip route list/flush" parameters: */
|
---|
543 | "protocol\0" "dev\0" "oif\0" "iif\0"
|
---|
544 | "via\0" "table\0" "cache\0"
|
---|
545 | "from\0" "to\0"
|
---|
546 | /* and possible further keywords */
|
---|
547 | "all\0"
|
---|
548 | "root\0"
|
---|
549 | "match\0"
|
---|
550 | "exact\0"
|
---|
551 | "main\0"
|
---|
552 | ;
|
---|
553 | enum {
|
---|
554 | KW_proto, KW_dev, KW_oif, KW_iif,
|
---|
555 | KW_via, KW_table, KW_cache,
|
---|
556 | KW_from, KW_to,
|
---|
557 | /* */
|
---|
558 | KW_all,
|
---|
559 | KW_root,
|
---|
560 | KW_match,
|
---|
561 | KW_exact,
|
---|
562 | KW_main,
|
---|
563 | };
|
---|
564 | int arg, parm;
|
---|
565 |
|
---|
566 | iproute_reset_filter();
|
---|
567 | G_filter.tb = RT_TABLE_MAIN;
|
---|
568 |
|
---|
569 | if (flush && !*argv)
|
---|
570 | bb_error_msg_and_die(bb_msg_requires_arg, "\"ip route flush\"");
|
---|
571 |
|
---|
572 | while (*argv) {
|
---|
573 | arg = index_in_substrings(keywords, *argv);
|
---|
574 | if (arg == KW_proto) {
|
---|
575 | uint32_t prot = 0;
|
---|
576 | NEXT_ARG();
|
---|
577 | //G_filter.protocolmask = -1;
|
---|
578 | if (rtnl_rtprot_a2n(&prot, *argv)) {
|
---|
579 | if (index_in_strings(keywords, *argv) != KW_all)
|
---|
580 | invarg(*argv, "protocol");
|
---|
581 | prot = 0;
|
---|
582 | //G_filter.protocolmask = 0;
|
---|
583 | }
|
---|
584 | //G_filter.protocol = prot;
|
---|
585 | } else if (arg == KW_dev || arg == KW_oif) {
|
---|
586 | NEXT_ARG();
|
---|
587 | od = *argv;
|
---|
588 | } else if (arg == KW_iif) {
|
---|
589 | NEXT_ARG();
|
---|
590 | id = *argv;
|
---|
591 | } else if (arg == KW_via) {
|
---|
592 | NEXT_ARG();
|
---|
593 | get_prefix(&G_filter.rvia, *argv, do_ipv6);
|
---|
594 | } else if (arg == KW_table) { /* table all/cache/main */
|
---|
595 | NEXT_ARG();
|
---|
596 | parm = index_in_substrings(keywords, *argv);
|
---|
597 | if (parm == KW_cache)
|
---|
598 | G_filter.tb = -1;
|
---|
599 | else if (parm == KW_all)
|
---|
600 | G_filter.tb = 0;
|
---|
601 | else if (parm != KW_main) {
|
---|
602 | #if ENABLE_FEATURE_IP_RULE
|
---|
603 | uint32_t tid;
|
---|
604 | if (rtnl_rttable_a2n(&tid, *argv))
|
---|
605 | invarg(*argv, "table");
|
---|
606 | G_filter.tb = tid;
|
---|
607 | #else
|
---|
608 | invarg(*argv, "table");
|
---|
609 | #endif
|
---|
610 | }
|
---|
611 | } else if (arg == KW_cache) {
|
---|
612 | /* The command 'ip route flush cache' is used by OpenSWAN.
|
---|
613 | * Assuming it's a synonym for 'ip route flush table cache' */
|
---|
614 | G_filter.tb = -1;
|
---|
615 | } else if (arg == KW_from) {
|
---|
616 | NEXT_ARG();
|
---|
617 | parm = index_in_substrings(keywords, *argv);
|
---|
618 | if (parm == KW_root) {
|
---|
619 | NEXT_ARG();
|
---|
620 | get_prefix(&G_filter.rsrc, *argv, do_ipv6);
|
---|
621 | } else if (parm == KW_match) {
|
---|
622 | NEXT_ARG();
|
---|
623 | get_prefix(&G_filter.msrc, *argv, do_ipv6);
|
---|
624 | } else {
|
---|
625 | if (parm == KW_exact)
|
---|
626 | NEXT_ARG();
|
---|
627 | get_prefix(&G_filter.msrc, *argv, do_ipv6);
|
---|
628 | G_filter.rsrc = G_filter.msrc;
|
---|
629 | }
|
---|
630 | } else { /* "to" is the default parameter */
|
---|
631 | if (arg == KW_to) {
|
---|
632 | NEXT_ARG();
|
---|
633 | arg = index_in_substrings(keywords, *argv);
|
---|
634 | }
|
---|
635 | /* parm = arg; - would be more plausible, but we reuse 'arg' here */
|
---|
636 | if (arg == KW_root) {
|
---|
637 | NEXT_ARG();
|
---|
638 | get_prefix(&G_filter.rdst, *argv, do_ipv6);
|
---|
639 | } else if (arg == KW_match) {
|
---|
640 | NEXT_ARG();
|
---|
641 | get_prefix(&G_filter.mdst, *argv, do_ipv6);
|
---|
642 | } else { /* "to exact" is the default */
|
---|
643 | if (arg == KW_exact)
|
---|
644 | NEXT_ARG();
|
---|
645 | get_prefix(&G_filter.mdst, *argv, do_ipv6);
|
---|
646 | G_filter.rdst = G_filter.mdst;
|
---|
647 | }
|
---|
648 | }
|
---|
649 | argv++;
|
---|
650 | }
|
---|
651 |
|
---|
652 | if (do_ipv6 == AF_UNSPEC && G_filter.tb) {
|
---|
653 | do_ipv6 = AF_INET;
|
---|
654 | }
|
---|
655 |
|
---|
656 | xrtnl_open(&rth);
|
---|
657 | ll_init_map(&rth);
|
---|
658 |
|
---|
659 | if (id || od) {
|
---|
660 | int idx;
|
---|
661 |
|
---|
662 | if (id) {
|
---|
663 | idx = xll_name_to_index(id);
|
---|
664 | G_filter.iif = idx;
|
---|
665 | G_filter.iifmask = -1;
|
---|
666 | }
|
---|
667 | if (od) {
|
---|
668 | idx = xll_name_to_index(od);
|
---|
669 | G_filter.oif = idx;
|
---|
670 | G_filter.oifmask = -1;
|
---|
671 | }
|
---|
672 | }
|
---|
673 |
|
---|
674 | if (flush) {
|
---|
675 | char flushb[4096-512];
|
---|
676 |
|
---|
677 | if (G_filter.tb == -1) { /* "flush table cache" */
|
---|
678 | if (do_ipv6 != AF_INET6)
|
---|
679 | iproute_flush_cache();
|
---|
680 | if (do_ipv6 == AF_INET)
|
---|
681 | return 0;
|
---|
682 | }
|
---|
683 |
|
---|
684 | G_filter.flushb = flushb;
|
---|
685 | G_filter.flushp = 0;
|
---|
686 | G_filter.flushe = sizeof(flushb);
|
---|
687 | G_filter.rth = &rth;
|
---|
688 |
|
---|
689 | for (;;) {
|
---|
690 | xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE);
|
---|
691 | G_filter.flushed = 0;
|
---|
692 | xrtnl_dump_filter(&rth, print_route, NULL);
|
---|
693 | if (G_filter.flushed == 0)
|
---|
694 | return 0;
|
---|
695 | if (flush_update())
|
---|
696 | return 1;
|
---|
697 | }
|
---|
698 | }
|
---|
699 |
|
---|
700 | if (G_filter.tb != -1) {
|
---|
701 | xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE);
|
---|
702 | } else if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
|
---|
703 | bb_perror_msg_and_die("can't send dump request");
|
---|
704 | }
|
---|
705 | xrtnl_dump_filter(&rth, print_route, NULL);
|
---|
706 |
|
---|
707 | return 0;
|
---|
708 | }
|
---|
709 |
|
---|
710 |
|
---|
711 | /* Return value becomes exitcode. It's okay to not return at all */
|
---|
712 | static int iproute_get(char **argv)
|
---|
713 | {
|
---|
714 | struct rtnl_handle rth;
|
---|
715 | struct {
|
---|
716 | struct nlmsghdr n;
|
---|
717 | struct rtmsg r;
|
---|
718 | char buf[1024];
|
---|
719 | } req;
|
---|
720 | char *idev = NULL;
|
---|
721 | char *odev = NULL;
|
---|
722 | bool connected = 0;
|
---|
723 | bool from_ok = 0;
|
---|
724 | static const char options[] ALIGN1 =
|
---|
725 | "from\0""iif\0""oif\0""dev\0""notify\0""connected\0""to\0";
|
---|
726 |
|
---|
727 | memset(&req, 0, sizeof(req));
|
---|
728 |
|
---|
729 | iproute_reset_filter();
|
---|
730 |
|
---|
731 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
|
---|
732 | if (NLM_F_REQUEST)
|
---|
733 | req.n.nlmsg_flags = NLM_F_REQUEST;
|
---|
734 | if (RTM_GETROUTE)
|
---|
735 | req.n.nlmsg_type = RTM_GETROUTE;
|
---|
736 | req.r.rtm_family = preferred_family;
|
---|
737 | /*req.r.rtm_table = 0; - memset did this already */
|
---|
738 | /*req.r.rtm_protocol = 0;*/
|
---|
739 | /*req.r.rtm_scope = 0;*/
|
---|
740 | /*req.r.rtm_type = 0;*/
|
---|
741 | /*req.r.rtm_src_len = 0;*/
|
---|
742 | /*req.r.rtm_dst_len = 0;*/
|
---|
743 | /*req.r.rtm_tos = 0;*/
|
---|
744 |
|
---|
745 | while (*argv) {
|
---|
746 | switch (index_in_strings(options, *argv)) {
|
---|
747 | case 0: /* from */
|
---|
748 | {
|
---|
749 | inet_prefix addr;
|
---|
750 | NEXT_ARG();
|
---|
751 | from_ok = 1;
|
---|
752 | get_prefix(&addr, *argv, req.r.rtm_family);
|
---|
753 | if (req.r.rtm_family == AF_UNSPEC) {
|
---|
754 | req.r.rtm_family = addr.family;
|
---|
755 | }
|
---|
756 | if (addr.bytelen) {
|
---|
757 | addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
|
---|
758 | }
|
---|
759 | req.r.rtm_src_len = addr.bitlen;
|
---|
760 | break;
|
---|
761 | }
|
---|
762 | case 1: /* iif */
|
---|
763 | NEXT_ARG();
|
---|
764 | idev = *argv;
|
---|
765 | break;
|
---|
766 | case 2: /* oif */
|
---|
767 | case 3: /* dev */
|
---|
768 | NEXT_ARG();
|
---|
769 | odev = *argv;
|
---|
770 | break;
|
---|
771 | case 4: /* notify */
|
---|
772 | req.r.rtm_flags |= RTM_F_NOTIFY;
|
---|
773 | break;
|
---|
774 | case 5: /* connected */
|
---|
775 | connected = 1;
|
---|
776 | break;
|
---|
777 | case 6: /* to */
|
---|
778 | NEXT_ARG();
|
---|
779 | default:
|
---|
780 | {
|
---|
781 | inet_prefix addr;
|
---|
782 | get_prefix(&addr, *argv, req.r.rtm_family);
|
---|
783 | if (req.r.rtm_family == AF_UNSPEC) {
|
---|
784 | req.r.rtm_family = addr.family;
|
---|
785 | }
|
---|
786 | if (addr.bytelen) {
|
---|
787 | addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen);
|
---|
788 | }
|
---|
789 | req.r.rtm_dst_len = addr.bitlen;
|
---|
790 | }
|
---|
791 | }
|
---|
792 | argv++;
|
---|
793 | }
|
---|
794 |
|
---|
795 | if (req.r.rtm_dst_len == 0) {
|
---|
796 | bb_error_msg_and_die("need at least destination address");
|
---|
797 | }
|
---|
798 |
|
---|
799 | xrtnl_open(&rth);
|
---|
800 |
|
---|
801 | ll_init_map(&rth);
|
---|
802 |
|
---|
803 | if (idev || odev) {
|
---|
804 | int idx;
|
---|
805 |
|
---|
806 | if (idev) {
|
---|
807 | idx = xll_name_to_index(idev);
|
---|
808 | addattr32(&req.n, sizeof(req), RTA_IIF, idx);
|
---|
809 | }
|
---|
810 | if (odev) {
|
---|
811 | idx = xll_name_to_index(odev);
|
---|
812 | addattr32(&req.n, sizeof(req), RTA_OIF, idx);
|
---|
813 | }
|
---|
814 | }
|
---|
815 |
|
---|
816 | if (req.r.rtm_family == AF_UNSPEC) {
|
---|
817 | req.r.rtm_family = AF_INET;
|
---|
818 | }
|
---|
819 |
|
---|
820 | if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
|
---|
821 | return 2;
|
---|
822 | }
|
---|
823 |
|
---|
824 | if (connected && !from_ok) {
|
---|
825 | struct rtmsg *r = NLMSG_DATA(&req.n);
|
---|
826 | int len = req.n.nlmsg_len;
|
---|
827 | struct rtattr * tb[RTA_MAX+1];
|
---|
828 |
|
---|
829 | print_route(NULL, &req.n, NULL);
|
---|
830 |
|
---|
831 | if (req.n.nlmsg_type != RTM_NEWROUTE) {
|
---|
832 | bb_error_msg_and_die("not a route?");
|
---|
833 | }
|
---|
834 | len -= NLMSG_LENGTH(sizeof(*r));
|
---|
835 | if (len < 0) {
|
---|
836 | bb_error_msg_and_die("wrong len %d", len);
|
---|
837 | }
|
---|
838 |
|
---|
839 | memset(tb, 0, sizeof(tb));
|
---|
840 | parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
|
---|
841 |
|
---|
842 | if (tb[RTA_PREFSRC]) {
|
---|
843 | tb[RTA_PREFSRC]->rta_type = RTA_SRC;
|
---|
844 | r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
|
---|
845 | } else if (!tb[RTA_SRC]) {
|
---|
846 | bb_error_msg_and_die("can't connect the route");
|
---|
847 | }
|
---|
848 | if (!odev && tb[RTA_OIF]) {
|
---|
849 | tb[RTA_OIF]->rta_type = 0;
|
---|
850 | }
|
---|
851 | if (tb[RTA_GATEWAY]) {
|
---|
852 | tb[RTA_GATEWAY]->rta_type = 0;
|
---|
853 | }
|
---|
854 | if (!idev && tb[RTA_IIF]) {
|
---|
855 | tb[RTA_IIF]->rta_type = 0;
|
---|
856 | }
|
---|
857 | req.n.nlmsg_flags = NLM_F_REQUEST;
|
---|
858 | req.n.nlmsg_type = RTM_GETROUTE;
|
---|
859 |
|
---|
860 | if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
|
---|
861 | return 2;
|
---|
862 | }
|
---|
863 | }
|
---|
864 | print_route(NULL, &req.n, NULL);
|
---|
865 | return 0;
|
---|
866 | }
|
---|
867 |
|
---|
868 | /* Return value becomes exitcode. It's okay to not return at all */
|
---|
869 | int FAST_FUNC do_iproute(char **argv)
|
---|
870 | {
|
---|
871 | static const char ip_route_commands[] ALIGN1 =
|
---|
872 | /*0-3*/ "add\0""append\0""change\0""chg\0"
|
---|
873 | /*4-7*/ "delete\0""get\0""list\0""show\0"
|
---|
874 | /*8..*/ "prepend\0""replace\0""test\0""flush\0";
|
---|
875 | int command_num;
|
---|
876 | unsigned flags = 0;
|
---|
877 | int cmd = RTM_NEWROUTE;
|
---|
878 |
|
---|
879 | if (!*argv)
|
---|
880 | return iproute_list_or_flush(argv, 0);
|
---|
881 |
|
---|
882 | /* "Standard" 'ip r a' treats 'a' as 'add', not 'append' */
|
---|
883 | /* It probably means that it is using "first match" rule */
|
---|
884 | command_num = index_in_substrings(ip_route_commands, *argv);
|
---|
885 |
|
---|
886 | switch (command_num) {
|
---|
887 | case 0: /* add */
|
---|
888 | flags = NLM_F_CREATE|NLM_F_EXCL;
|
---|
889 | break;
|
---|
890 | case 1: /* append */
|
---|
891 | flags = NLM_F_CREATE|NLM_F_APPEND;
|
---|
892 | break;
|
---|
893 | case 2: /* change */
|
---|
894 | case 3: /* chg */
|
---|
895 | flags = NLM_F_REPLACE;
|
---|
896 | break;
|
---|
897 | case 4: /* delete */
|
---|
898 | cmd = RTM_DELROUTE;
|
---|
899 | break;
|
---|
900 | case 5: /* get */
|
---|
901 | return iproute_get(argv+1);
|
---|
902 | case 6: /* list */
|
---|
903 | case 7: /* show */
|
---|
904 | return iproute_list_or_flush(argv+1, 0);
|
---|
905 | case 8: /* prepend */
|
---|
906 | flags = NLM_F_CREATE;
|
---|
907 | break;
|
---|
908 | case 9: /* replace */
|
---|
909 | flags = NLM_F_CREATE|NLM_F_REPLACE;
|
---|
910 | break;
|
---|
911 | case 10: /* test */
|
---|
912 | flags = NLM_F_EXCL;
|
---|
913 | break;
|
---|
914 | case 11: /* flush */
|
---|
915 | return iproute_list_or_flush(argv+1, 1);
|
---|
916 | default:
|
---|
917 | bb_error_msg_and_die("unknown command %s", *argv);
|
---|
918 | }
|
---|
919 |
|
---|
920 | return iproute_modify(cmd, flags, argv+1);
|
---|
921 | }
|
---|