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Commit | Line | Data |
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aba5acdf SH |
1 | /* |
2 | * libnetlink.c RTnetlink service routines. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <stdio.h> | |
14 | #include <stdlib.h> | |
463d9efa | 15 | #include <stdbool.h> |
aba5acdf SH |
16 | #include <unistd.h> |
17 | #include <syslog.h> | |
18 | #include <fcntl.h> | |
19 | #include <net/if_arp.h> | |
20 | #include <sys/socket.h> | |
21 | #include <netinet/in.h> | |
22 | #include <string.h> | |
23 | #include <errno.h> | |
24 | #include <time.h> | |
25 | #include <sys/uio.h> | |
26 | ||
27 | #include "libnetlink.h" | |
28 | ||
449b824a ND |
29 | #ifndef SOL_NETLINK |
30 | #define SOL_NETLINK 270 | |
31 | #endif | |
32 | ||
c079e121 SH |
33 | #ifndef MIN |
34 | #define MIN(a, b) ((a) < (b) ? (a) : (b)) | |
35 | #endif | |
36 | ||
7f03191f PM |
37 | int rcvbuf = 1024 * 1024; |
38 | ||
b6432e68 SH |
39 | #ifdef HAVE_LIBMNL |
40 | #include <libmnl/libmnl.h> | |
41 | ||
42 | static const enum mnl_attr_data_type extack_policy[NLMSGERR_ATTR_MAX + 1] = { | |
43 | [NLMSGERR_ATTR_MSG] = MNL_TYPE_NUL_STRING, | |
44 | [NLMSGERR_ATTR_OFFS] = MNL_TYPE_U32, | |
45 | }; | |
46 | ||
47 | static int err_attr_cb(const struct nlattr *attr, void *data) | |
48 | { | |
49 | const struct nlattr **tb = data; | |
50 | uint16_t type; | |
51 | ||
e5fa0e6f DA |
52 | if (mnl_attr_type_valid(attr, NLMSGERR_ATTR_MAX) < 0) { |
53 | fprintf(stderr, "Invalid extack attribute\n"); | |
b6432e68 | 54 | return MNL_CB_ERROR; |
e5fa0e6f | 55 | } |
b6432e68 SH |
56 | |
57 | type = mnl_attr_get_type(attr); | |
e5fa0e6f DA |
58 | if (mnl_attr_validate(attr, extack_policy[type]) < 0) { |
59 | fprintf(stderr, "extack attribute %d failed validation\n", | |
60 | type); | |
b6432e68 | 61 | return MNL_CB_ERROR; |
e5fa0e6f | 62 | } |
b6432e68 SH |
63 | |
64 | tb[type] = attr; | |
65 | return MNL_CB_OK; | |
66 | } | |
67 | ||
b6432e68 SH |
68 | /* dump netlink extended ack error message */ |
69 | static int nl_dump_ext_err(const struct nlmsghdr *nlh, nl_ext_ack_fn_t errfn) | |
70 | { | |
e5fa0e6f | 71 | struct nlattr *tb[NLMSGERR_ATTR_MAX + 1] = {}; |
b6432e68 SH |
72 | const struct nlmsgerr *err = mnl_nlmsg_get_payload(nlh); |
73 | const struct nlmsghdr *err_nlh = NULL; | |
74 | unsigned int hlen = sizeof(*err); | |
75 | const char *errmsg = NULL; | |
76 | uint32_t off = 0; | |
77 | ||
b6432e68 SH |
78 | /* no TLVs, nothing to do here */ |
79 | if (!(nlh->nlmsg_flags & NLM_F_ACK_TLVS)) | |
80 | return 0; | |
81 | ||
82 | /* if NLM_F_CAPPED is set then the inner err msg was capped */ | |
83 | if (!(nlh->nlmsg_flags & NLM_F_CAPPED)) | |
84 | hlen += mnl_nlmsg_get_payload_len(&err->msg); | |
85 | ||
e5fa0e6f DA |
86 | if (mnl_attr_parse(nlh, hlen, err_attr_cb, tb) != MNL_CB_OK) |
87 | return 0; | |
b6432e68 SH |
88 | |
89 | if (tb[NLMSGERR_ATTR_MSG]) | |
90 | errmsg = mnl_attr_get_str(tb[NLMSGERR_ATTR_MSG]); | |
91 | ||
92 | if (tb[NLMSGERR_ATTR_OFFS]) { | |
93 | off = mnl_attr_get_u32(tb[NLMSGERR_ATTR_OFFS]); | |
94 | ||
95 | if (off > nlh->nlmsg_len) { | |
96 | fprintf(stderr, | |
97 | "Invalid offset for NLMSGERR_ATTR_OFFS\n"); | |
98 | off = 0; | |
99 | } else if (!(nlh->nlmsg_flags & NLM_F_CAPPED)) | |
100 | err_nlh = &err->msg; | |
101 | } | |
102 | ||
fb6cb307 DA |
103 | if (errfn) |
104 | return errfn(errmsg, off, err_nlh); | |
105 | ||
106 | if (errmsg && *errmsg != '\0') { | |
107 | fprintf(stderr, "Error: %s", errmsg); | |
108 | if (errmsg[strlen(errmsg) - 1] != '.') | |
109 | fprintf(stderr, "."); | |
110 | fprintf(stderr, "\n"); | |
111 | ||
112 | return 1; | |
113 | } | |
114 | ||
115 | return 0; | |
b6432e68 SH |
116 | } |
117 | #else | |
7d23fa55 SH |
118 | #warning "libmnl required for error support" |
119 | ||
b6432e68 SH |
120 | /* No extended error ack without libmnl */ |
121 | static int nl_dump_ext_err(const struct nlmsghdr *nlh, nl_ext_ack_fn_t errfn) | |
122 | { | |
123 | return 0; | |
124 | } | |
125 | #endif | |
126 | ||
aba5acdf SH |
127 | void rtnl_close(struct rtnl_handle *rth) |
128 | { | |
3bfa73ff SH |
129 | if (rth->fd >= 0) { |
130 | close(rth->fd); | |
131 | rth->fd = -1; | |
132 | } | |
aba5acdf SH |
133 | } |
134 | ||
2c500a4d | 135 | int rtnl_open_byproto(struct rtnl_handle *rth, unsigned int subscriptions, |
8ed63ab1 | 136 | int protocol) |
aba5acdf | 137 | { |
f332d169 | 138 | socklen_t addr_len; |
007d3a3e | 139 | int sndbuf = 32768; |
b6432e68 | 140 | int one = 1; |
aba5acdf | 141 | |
b16621ca | 142 | memset(rth, 0, sizeof(*rth)); |
aba5acdf | 143 | |
8a4025f6 | 144 | rth->proto = protocol; |
bcb9d403 | 145 | rth->fd = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, protocol); |
aba5acdf SH |
146 | if (rth->fd < 0) { |
147 | perror("Cannot open netlink socket"); | |
148 | return -1; | |
149 | } | |
150 | ||
2c500a4d SH |
151 | if (setsockopt(rth->fd, SOL_SOCKET, SO_SNDBUF, |
152 | &sndbuf, sizeof(sndbuf)) < 0) { | |
007d3a3e SH |
153 | perror("SO_SNDBUF"); |
154 | return -1; | |
155 | } | |
156 | ||
2c500a4d SH |
157 | if (setsockopt(rth->fd, SOL_SOCKET, SO_RCVBUF, |
158 | &rcvbuf, sizeof(rcvbuf)) < 0) { | |
007d3a3e SH |
159 | perror("SO_RCVBUF"); |
160 | return -1; | |
161 | } | |
162 | ||
b6432e68 SH |
163 | /* Older kernels may no support extended ACK reporting */ |
164 | setsockopt(rth->fd, SOL_NETLINK, NETLINK_EXT_ACK, | |
165 | &one, sizeof(one)); | |
166 | ||
aba5acdf SH |
167 | memset(&rth->local, 0, sizeof(rth->local)); |
168 | rth->local.nl_family = AF_NETLINK; | |
169 | rth->local.nl_groups = subscriptions; | |
170 | ||
2c500a4d SH |
171 | if (bind(rth->fd, (struct sockaddr *)&rth->local, |
172 | sizeof(rth->local)) < 0) { | |
aba5acdf SH |
173 | perror("Cannot bind netlink socket"); |
174 | return -1; | |
175 | } | |
176 | addr_len = sizeof(rth->local); | |
2c500a4d SH |
177 | if (getsockname(rth->fd, (struct sockaddr *)&rth->local, |
178 | &addr_len) < 0) { | |
aba5acdf SH |
179 | perror("Cannot getsockname"); |
180 | return -1; | |
181 | } | |
182 | if (addr_len != sizeof(rth->local)) { | |
183 | fprintf(stderr, "Wrong address length %d\n", addr_len); | |
184 | return -1; | |
185 | } | |
186 | if (rth->local.nl_family != AF_NETLINK) { | |
2c500a4d SH |
187 | fprintf(stderr, "Wrong address family %d\n", |
188 | rth->local.nl_family); | |
aba5acdf SH |
189 | return -1; |
190 | } | |
191 | rth->seq = time(NULL); | |
192 | return 0; | |
193 | } | |
194 | ||
2c500a4d | 195 | int rtnl_open(struct rtnl_handle *rth, unsigned int subscriptions) |
c7699875 | 196 | { |
197 | return rtnl_open_byproto(rth, subscriptions, NETLINK_ROUTE); | |
198 | } | |
199 | ||
aba5acdf | 200 | int rtnl_wilddump_request(struct rtnl_handle *rth, int family, int type) |
9eff0e5c VY |
201 | { |
202 | return rtnl_wilddump_req_filter(rth, family, type, RTEXT_FILTER_VF); | |
203 | } | |
204 | ||
205 | int rtnl_wilddump_req_filter(struct rtnl_handle *rth, int family, int type, | |
206 | __u32 filt_mask) | |
aba5acdf SH |
207 | { |
208 | struct { | |
209 | struct nlmsghdr nlh; | |
63338dca | 210 | struct ifinfomsg ifm; |
257422f7 LJ |
211 | /* attribute has to be NLMSG aligned */ |
212 | struct rtattr ext_req __attribute__ ((aligned(NLMSG_ALIGNTO))); | |
bd886ebb | 213 | __u32 ext_filter_mask; |
d17b136f PS |
214 | } req = { |
215 | .nlh.nlmsg_len = sizeof(req), | |
216 | .nlh.nlmsg_type = type, | |
217 | .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, | |
218 | .nlh.nlmsg_seq = rth->dump = ++rth->seq, | |
219 | .ifm.ifi_family = family, | |
220 | .ext_req.rta_type = IFLA_EXT_MASK, | |
221 | .ext_req.rta_len = RTA_LENGTH(sizeof(__u32)), | |
222 | .ext_filter_mask = filt_mask, | |
223 | }; | |
bd886ebb | 224 | |
2c500a4d | 225 | return send(rth->fd, &req, sizeof(req), 0); |
aba5acdf SH |
226 | } |
227 | ||
b0a4ce62 DA |
228 | int rtnl_wilddump_req_filter_fn(struct rtnl_handle *rth, int family, int type, |
229 | req_filter_fn_t filter_fn) | |
230 | { | |
231 | struct { | |
232 | struct nlmsghdr nlh; | |
233 | struct ifinfomsg ifm; | |
234 | char buf[1024]; | |
d17b136f PS |
235 | } req = { |
236 | .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)), | |
237 | .nlh.nlmsg_type = type, | |
238 | .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, | |
239 | .nlh.nlmsg_seq = rth->dump = ++rth->seq, | |
240 | .ifm.ifi_family = family, | |
241 | }; | |
b0a4ce62 DA |
242 | int err; |
243 | ||
244 | if (!filter_fn) | |
245 | return -EINVAL; | |
246 | ||
b0a4ce62 DA |
247 | err = filter_fn(&req.nlh, sizeof(req)); |
248 | if (err) | |
249 | return err; | |
250 | ||
1b109a30 | 251 | return send(rth->fd, &req, req.nlh.nlmsg_len, 0); |
b0a4ce62 DA |
252 | } |
253 | ||
7abf5de6 NA |
254 | int rtnl_wilddump_stats_req_filter(struct rtnl_handle *rth, int fam, int type, |
255 | __u32 filt_mask) | |
256 | { | |
257 | struct { | |
258 | struct nlmsghdr nlh; | |
259 | struct if_stats_msg ifsm; | |
260 | } req; | |
261 | ||
262 | memset(&req, 0, sizeof(req)); | |
263 | req.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct if_stats_msg)); | |
264 | req.nlh.nlmsg_type = type; | |
265 | req.nlh.nlmsg_flags = NLM_F_DUMP|NLM_F_REQUEST; | |
266 | req.nlh.nlmsg_pid = 0; | |
267 | req.nlh.nlmsg_seq = rth->dump = ++rth->seq; | |
268 | req.ifsm.family = fam; | |
269 | req.ifsm.filter_mask = filt_mask; | |
270 | ||
2c500a4d | 271 | return send(rth->fd, &req, sizeof(req), 0); |
7abf5de6 NA |
272 | } |
273 | ||
6cf8398f | 274 | int rtnl_send(struct rtnl_handle *rth, const void *buf, int len) |
aba5acdf | 275 | { |
f31a37f7 SH |
276 | return send(rth->fd, buf, len, 0); |
277 | } | |
278 | ||
6cf8398f | 279 | int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int len) |
f31a37f7 | 280 | { |
54bb35c6 SH |
281 | struct nlmsghdr *h; |
282 | int status; | |
283 | char resp[1024]; | |
aba5acdf | 284 | |
f31a37f7 | 285 | status = send(rth->fd, buf, len, 0); |
54bb35c6 SH |
286 | if (status < 0) |
287 | return status; | |
288 | ||
2d8240f8 SH |
289 | /* Check for immediate errors */ |
290 | status = recv(rth->fd, resp, sizeof(resp), MSG_DONTWAIT|MSG_PEEK); | |
54bb35c6 SH |
291 | if (status < 0) { |
292 | if (errno == EAGAIN) | |
293 | return 0; | |
294 | return -1; | |
295 | } | |
296 | ||
297 | for (h = (struct nlmsghdr *)resp; NLMSG_OK(h, status); | |
298 | h = NLMSG_NEXT(h, status)) { | |
299 | if (h->nlmsg_type == NLMSG_ERROR) { | |
2c500a4d SH |
300 | struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h); |
301 | ||
54bb35c6 SH |
302 | if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) |
303 | fprintf(stderr, "ERROR truncated\n"); | |
e9e9365b | 304 | else |
54bb35c6 | 305 | errno = -err->error; |
24f38182 | 306 | return -1; |
54bb35c6 | 307 | } |
54bb35c6 SH |
308 | } |
309 | ||
310 | return 0; | |
aba5acdf SH |
311 | } |
312 | ||
313 | int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len) | |
314 | { | |
d17b136f PS |
315 | struct nlmsghdr nlh = { |
316 | .nlmsg_len = NLMSG_LENGTH(len), | |
317 | .nlmsg_type = type, | |
318 | .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, | |
319 | .nlmsg_seq = rth->dump = ++rth->seq, | |
320 | }; | |
6cf8398f | 321 | struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK }; |
8ed63ab1 SH |
322 | struct iovec iov[2] = { |
323 | { .iov_base = &nlh, .iov_len = sizeof(nlh) }, | |
324 | { .iov_base = req, .iov_len = len } | |
325 | }; | |
aba5acdf | 326 | struct msghdr msg = { |
8ed63ab1 | 327 | .msg_name = &nladdr, |
d17b136f | 328 | .msg_namelen = sizeof(nladdr), |
8ed63ab1 SH |
329 | .msg_iov = iov, |
330 | .msg_iovlen = 2, | |
aba5acdf SH |
331 | }; |
332 | ||
aba5acdf SH |
333 | return sendmsg(rth->fd, &msg, 0); |
334 | } | |
335 | ||
0d238ca2 DA |
336 | int rtnl_dump_request_n(struct rtnl_handle *rth, struct nlmsghdr *n) |
337 | { | |
338 | struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK }; | |
339 | struct iovec iov = { | |
2c500a4d | 340 | .iov_base = n, |
0d238ca2 DA |
341 | .iov_len = n->nlmsg_len |
342 | }; | |
343 | struct msghdr msg = { | |
344 | .msg_name = &nladdr, | |
345 | .msg_namelen = sizeof(nladdr), | |
346 | .msg_iov = &iov, | |
347 | .msg_iovlen = 1, | |
348 | }; | |
349 | ||
350 | n->nlmsg_flags = NLM_F_DUMP|NLM_F_REQUEST; | |
351 | n->nlmsg_pid = 0; | |
352 | n->nlmsg_seq = rth->dump = ++rth->seq; | |
353 | ||
354 | return sendmsg(rth->fd, &msg, 0); | |
355 | } | |
356 | ||
0efa6257 | 357 | static int rtnl_dump_done(struct nlmsghdr *h) |
892a25e2 SH |
358 | { |
359 | int len = *(int *)NLMSG_DATA(h); | |
360 | ||
05a14fc1 DA |
361 | if (h->nlmsg_len < NLMSG_LENGTH(sizeof(int))) { |
362 | fprintf(stderr, "DONE truncated\n"); | |
363 | return -1; | |
364 | } | |
892a25e2 | 365 | |
05a14fc1 DA |
366 | if (len < 0) { |
367 | errno = -len; | |
368 | switch (errno) { | |
369 | case ENOENT: | |
370 | case EOPNOTSUPP: | |
371 | return -1; | |
372 | case EMSGSIZE: | |
373 | fprintf(stderr, | |
374 | "Error: Buffer too small for object.\n"); | |
375 | break; | |
376 | default: | |
892a25e2 | 377 | perror("RTNETLINK answers"); |
892a25e2 | 378 | } |
05a14fc1 | 379 | return len; |
892a25e2 | 380 | } |
05a14fc1 | 381 | |
892a25e2 SH |
382 | return 0; |
383 | } | |
384 | ||
385 | static void rtnl_dump_error(const struct rtnl_handle *rth, | |
386 | struct nlmsghdr *h) | |
387 | { | |
388 | ||
389 | if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) { | |
390 | fprintf(stderr, "ERROR truncated\n"); | |
391 | } else { | |
392 | const struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h); | |
393 | ||
394 | errno = -err->error; | |
395 | if (rth->proto == NETLINK_SOCK_DIAG && | |
396 | (errno == ENOENT || | |
397 | errno == EOPNOTSUPP)) | |
398 | return; | |
399 | ||
3ad6d176 DA |
400 | if (!(rth->flags & RTNL_HANDLE_F_SUPPRESS_NLERR)) |
401 | perror("RTNETLINK answers"); | |
892a25e2 SH |
402 | } |
403 | } | |
404 | ||
2d34851c HL |
405 | static int __rtnl_recvmsg(int fd, struct msghdr *msg, int flags) |
406 | { | |
407 | int len; | |
408 | ||
409 | do { | |
410 | len = recvmsg(fd, msg, flags); | |
411 | } while (len < 0 && (errno == EINTR || errno == EAGAIN)); | |
412 | ||
413 | if (len < 0) { | |
414 | fprintf(stderr, "netlink receive error %s (%d)\n", | |
415 | strerror(errno), errno); | |
416 | return -errno; | |
417 | } | |
418 | ||
419 | if (len == 0) { | |
420 | fprintf(stderr, "EOF on netlink\n"); | |
421 | return -ENODATA; | |
422 | } | |
423 | ||
424 | return len; | |
425 | } | |
426 | ||
427 | static int rtnl_recvmsg(int fd, struct msghdr *msg, char **answer) | |
428 | { | |
429 | struct iovec *iov = msg->msg_iov; | |
430 | char *buf; | |
431 | int len; | |
432 | ||
433 | iov->iov_base = NULL; | |
434 | iov->iov_len = 0; | |
435 | ||
436 | len = __rtnl_recvmsg(fd, msg, MSG_PEEK | MSG_TRUNC); | |
437 | if (len < 0) | |
438 | return len; | |
439 | ||
440 | buf = malloc(len); | |
441 | if (!buf) { | |
442 | fprintf(stderr, "malloc error: not enough buffer\n"); | |
443 | return -ENOMEM; | |
444 | } | |
445 | ||
446 | iov->iov_base = buf; | |
447 | iov->iov_len = len; | |
448 | ||
449 | len = __rtnl_recvmsg(fd, msg, 0); | |
450 | if (len < 0) { | |
451 | free(buf); | |
452 | return len; | |
453 | } | |
454 | ||
455 | if (answer) | |
456 | *answer = buf; | |
457 | else | |
458 | free(buf); | |
459 | ||
460 | return len; | |
461 | } | |
462 | ||
b49240ec SH |
463 | int rtnl_dump_filter_l(struct rtnl_handle *rth, |
464 | const struct rtnl_dump_filter_arg *arg) | |
aba5acdf | 465 | { |
aba5acdf | 466 | struct sockaddr_nl nladdr; |
8ed63ab1 SH |
467 | struct iovec iov; |
468 | struct msghdr msg = { | |
469 | .msg_name = &nladdr, | |
470 | .msg_namelen = sizeof(nladdr), | |
471 | .msg_iov = &iov, | |
472 | .msg_iovlen = 1, | |
473 | }; | |
2d34851c | 474 | char *buf; |
16f02e14 | 475 | int dump_intr = 0; |
aba5acdf SH |
476 | |
477 | while (1) { | |
478 | int status; | |
b49240ec | 479 | const struct rtnl_dump_filter_arg *a; |
3bc1c4f2 BG |
480 | int found_done = 0; |
481 | int msglen = 0; | |
aba5acdf | 482 | |
2d34851c HL |
483 | status = rtnl_recvmsg(rth->fd, &msg, &buf); |
484 | if (status < 0) | |
485 | return status; | |
aba5acdf | 486 | |
486ccd99 VK |
487 | if (rth->dump_fp) |
488 | fwrite(buf, 1, NLMSG_ALIGN(status), rth->dump_fp); | |
489 | ||
b49240ec | 490 | for (a = arg; a->filter; a++) { |
2c500a4d SH |
491 | struct nlmsghdr *h = (struct nlmsghdr *)buf; |
492 | ||
3bc1c4f2 | 493 | msglen = status; |
b49240ec | 494 | |
3bc1c4f2 | 495 | while (NLMSG_OK(h, msglen)) { |
486ccd99 | 496 | int err = 0; |
b49240ec | 497 | |
8e72880f PS |
498 | h->nlmsg_flags &= ~a->nc_flags; |
499 | ||
b49240ec SH |
500 | if (nladdr.nl_pid != 0 || |
501 | h->nlmsg_pid != rth->local.nl_pid || | |
cd70f3f5 | 502 | h->nlmsg_seq != rth->dump) |
b49240ec | 503 | goto skip_it; |
aba5acdf | 504 | |
16f02e14 ND |
505 | if (h->nlmsg_flags & NLM_F_DUMP_INTR) |
506 | dump_intr = 1; | |
507 | ||
3bc1c4f2 | 508 | if (h->nlmsg_type == NLMSG_DONE) { |
0efa6257 | 509 | err = rtnl_dump_done(h); |
2d34851c HL |
510 | if (err < 0) { |
511 | free(buf); | |
892a25e2 | 512 | return -1; |
2d34851c | 513 | } |
892a25e2 | 514 | |
3bc1c4f2 BG |
515 | found_done = 1; |
516 | break; /* process next filter */ | |
517 | } | |
892a25e2 | 518 | |
b49240ec | 519 | if (h->nlmsg_type == NLMSG_ERROR) { |
892a25e2 | 520 | rtnl_dump_error(rth, h); |
2d34851c | 521 | free(buf); |
b49240ec | 522 | return -1; |
aba5acdf | 523 | } |
486ccd99 VK |
524 | |
525 | if (!rth->dump_fp) { | |
526 | err = a->filter(&nladdr, h, a->arg1); | |
2d34851c HL |
527 | if (err < 0) { |
528 | free(buf); | |
486ccd99 | 529 | return err; |
2d34851c | 530 | } |
486ccd99 | 531 | } |
aba5acdf SH |
532 | |
533 | skip_it: | |
3bc1c4f2 | 534 | h = NLMSG_NEXT(h, msglen); |
b49240ec | 535 | } |
3bc1c4f2 | 536 | } |
2d34851c | 537 | free(buf); |
3bc1c4f2 | 538 | |
16f02e14 ND |
539 | if (found_done) { |
540 | if (dump_intr) | |
541 | fprintf(stderr, | |
542 | "Dump was interrupted and may be inconsistent.\n"); | |
3bc1c4f2 | 543 | return 0; |
16f02e14 | 544 | } |
3bc1c4f2 | 545 | |
aba5acdf SH |
546 | if (msg.msg_flags & MSG_TRUNC) { |
547 | fprintf(stderr, "Message truncated\n"); | |
548 | continue; | |
549 | } | |
3bc1c4f2 BG |
550 | if (msglen) { |
551 | fprintf(stderr, "!!!Remnant of size %d\n", msglen); | |
aba5acdf SH |
552 | exit(1); |
553 | } | |
554 | } | |
555 | } | |
556 | ||
8e72880f | 557 | int rtnl_dump_filter_nc(struct rtnl_handle *rth, |
b49240ec | 558 | rtnl_filter_t filter, |
8e72880f | 559 | void *arg1, __u16 nc_flags) |
b49240ec SH |
560 | { |
561 | const struct rtnl_dump_filter_arg a[2] = { | |
8e72880f PS |
562 | { .filter = filter, .arg1 = arg1, .nc_flags = nc_flags, }, |
563 | { .filter = NULL, .arg1 = NULL, .nc_flags = 0, }, | |
b49240ec SH |
564 | }; |
565 | ||
566 | return rtnl_dump_filter_l(rth, a); | |
567 | } | |
568 | ||
b6432e68 SH |
569 | static void rtnl_talk_error(struct nlmsghdr *h, struct nlmsgerr *err, |
570 | nl_ext_ack_fn_t errfn) | |
571 | { | |
572 | if (nl_dump_ext_err(h, errfn)) | |
573 | return; | |
574 | ||
575 | fprintf(stderr, "RTNETLINK answers: %s\n", | |
576 | strerror(-err->error)); | |
577 | } | |
578 | ||
463d9efa | 579 | static int __rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, |
86bf43c7 | 580 | struct nlmsghdr **answer, |
b6432e68 | 581 | bool show_rtnl_err, nl_ext_ack_fn_t errfn) |
aba5acdf SH |
582 | { |
583 | int status; | |
2c500a4d | 584 | unsigned int seq; |
aba5acdf | 585 | struct nlmsghdr *h; |
d17b136f | 586 | struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK }; |
fb229759 | 587 | struct iovec iov = { |
2c500a4d | 588 | .iov_base = n, |
fb229759 SH |
589 | .iov_len = n->nlmsg_len |
590 | }; | |
aba5acdf | 591 | struct msghdr msg = { |
8ed63ab1 SH |
592 | .msg_name = &nladdr, |
593 | .msg_namelen = sizeof(nladdr), | |
594 | .msg_iov = &iov, | |
595 | .msg_iovlen = 1, | |
aba5acdf | 596 | }; |
2d34851c | 597 | char *buf; |
aba5acdf SH |
598 | |
599 | n->nlmsg_seq = seq = ++rtnl->seq; | |
007d3a3e | 600 | |
aba5acdf SH |
601 | if (answer == NULL) |
602 | n->nlmsg_flags |= NLM_F_ACK; | |
603 | ||
604 | status = sendmsg(rtnl->fd, &msg, 0); | |
aba5acdf SH |
605 | if (status < 0) { |
606 | perror("Cannot talk to rtnetlink"); | |
607 | return -1; | |
608 | } | |
609 | ||
aba5acdf | 610 | while (1) { |
2d34851c HL |
611 | status = rtnl_recvmsg(rtnl->fd, &msg, &buf); |
612 | ||
613 | if (status < 0) | |
614 | return status; | |
aba5acdf | 615 | |
aba5acdf | 616 | if (msg.msg_namelen != sizeof(nladdr)) { |
2c500a4d SH |
617 | fprintf(stderr, |
618 | "sender address length == %d\n", | |
619 | msg.msg_namelen); | |
aba5acdf SH |
620 | exit(1); |
621 | } | |
2c500a4d | 622 | for (h = (struct nlmsghdr *)buf; status >= sizeof(*h); ) { |
aba5acdf SH |
623 | int len = h->nlmsg_len; |
624 | int l = len - sizeof(*h); | |
625 | ||
2c500a4d | 626 | if (l < 0 || len > status) { |
aba5acdf SH |
627 | if (msg.msg_flags & MSG_TRUNC) { |
628 | fprintf(stderr, "Truncated message\n"); | |
2d34851c | 629 | free(buf); |
aba5acdf SH |
630 | return -1; |
631 | } | |
2c500a4d SH |
632 | fprintf(stderr, |
633 | "!!!malformed message: len=%d\n", | |
634 | len); | |
aba5acdf SH |
635 | exit(1); |
636 | } | |
637 | ||
c079e121 | 638 | if (nladdr.nl_pid != 0 || |
10f57ef1 | 639 | h->nlmsg_pid != rtnl->local.nl_pid || |
aba5acdf | 640 | h->nlmsg_seq != seq) { |
4cca16f2 SH |
641 | /* Don't forget to skip that message. */ |
642 | status -= NLMSG_ALIGN(len); | |
2c500a4d | 643 | h = (struct nlmsghdr *)((char *)h + NLMSG_ALIGN(len)); |
aba5acdf SH |
644 | continue; |
645 | } | |
646 | ||
647 | if (h->nlmsg_type == NLMSG_ERROR) { | |
2c500a4d SH |
648 | struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h); |
649 | ||
aba5acdf SH |
650 | if (l < sizeof(struct nlmsgerr)) { |
651 | fprintf(stderr, "ERROR truncated\n"); | |
c079e121 SH |
652 | } else if (!err->error) { |
653 | if (answer) | |
86bf43c7 HL |
654 | *answer = (struct nlmsghdr *)buf; |
655 | else | |
656 | free(buf); | |
c079e121 | 657 | return 0; |
aba5acdf | 658 | } |
c079e121 | 659 | |
b6432e68 SH |
660 | if (rtnl->proto != NETLINK_SOCK_DIAG && |
661 | show_rtnl_err) | |
662 | rtnl_talk_error(h, err, errfn); | |
663 | ||
c079e121 | 664 | errno = -err->error; |
2d34851c | 665 | free(buf); |
aba5acdf SH |
666 | return -1; |
667 | } | |
c079e121 | 668 | |
aba5acdf | 669 | if (answer) { |
86bf43c7 | 670 | *answer = (struct nlmsghdr *)buf; |
aba5acdf SH |
671 | return 0; |
672 | } | |
673 | ||
674 | fprintf(stderr, "Unexpected reply!!!\n"); | |
675 | ||
676 | status -= NLMSG_ALIGN(len); | |
2c500a4d | 677 | h = (struct nlmsghdr *)((char *)h + NLMSG_ALIGN(len)); |
aba5acdf | 678 | } |
2d34851c | 679 | free(buf); |
c079e121 | 680 | |
aba5acdf SH |
681 | if (msg.msg_flags & MSG_TRUNC) { |
682 | fprintf(stderr, "Message truncated\n"); | |
683 | continue; | |
684 | } | |
c079e121 | 685 | |
aba5acdf SH |
686 | if (status) { |
687 | fprintf(stderr, "!!!Remnant of size %d\n", status); | |
688 | exit(1); | |
689 | } | |
690 | } | |
691 | } | |
692 | ||
463d9efa | 693 | int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, |
86bf43c7 | 694 | struct nlmsghdr **answer) |
463d9efa | 695 | { |
86bf43c7 | 696 | return __rtnl_talk(rtnl, n, answer, true, NULL); |
b6432e68 SH |
697 | } |
698 | ||
699 | int rtnl_talk_extack(struct rtnl_handle *rtnl, struct nlmsghdr *n, | |
86bf43c7 | 700 | struct nlmsghdr **answer, |
b6432e68 SH |
701 | nl_ext_ack_fn_t errfn) |
702 | { | |
86bf43c7 | 703 | return __rtnl_talk(rtnl, n, answer, true, errfn); |
463d9efa DA |
704 | } |
705 | ||
706 | int rtnl_talk_suppress_rtnl_errmsg(struct rtnl_handle *rtnl, struct nlmsghdr *n, | |
86bf43c7 | 707 | struct nlmsghdr **answer) |
463d9efa | 708 | { |
86bf43c7 | 709 | return __rtnl_talk(rtnl, n, answer, false, NULL); |
463d9efa DA |
710 | } |
711 | ||
449b824a ND |
712 | int rtnl_listen_all_nsid(struct rtnl_handle *rth) |
713 | { | |
714 | unsigned int on = 1; | |
715 | ||
716 | if (setsockopt(rth->fd, SOL_NETLINK, NETLINK_LISTEN_ALL_NSID, &on, | |
717 | sizeof(on)) < 0) { | |
718 | perror("NETLINK_LISTEN_ALL_NSID"); | |
719 | return -1; | |
720 | } | |
721 | rth->flags |= RTNL_HANDLE_F_LISTEN_ALL_NSID; | |
722 | return 0; | |
723 | } | |
724 | ||
8ed63ab1 | 725 | int rtnl_listen(struct rtnl_handle *rtnl, |
0628cddd | 726 | rtnl_listen_filter_t handler, |
6dc9f016 | 727 | void *jarg) |
aba5acdf SH |
728 | { |
729 | int status; | |
730 | struct nlmsghdr *h; | |
d17b136f | 731 | struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK }; |
aba5acdf | 732 | struct iovec iov; |
aba5acdf | 733 | struct msghdr msg = { |
8ed63ab1 SH |
734 | .msg_name = &nladdr, |
735 | .msg_namelen = sizeof(nladdr), | |
736 | .msg_iov = &iov, | |
737 | .msg_iovlen = 1, | |
aba5acdf | 738 | }; |
e557212e | 739 | char buf[16384]; |
449b824a ND |
740 | char cmsgbuf[BUFSIZ]; |
741 | ||
742 | if (rtnl->flags & RTNL_HANDLE_F_LISTEN_ALL_NSID) { | |
743 | msg.msg_control = &cmsgbuf; | |
744 | msg.msg_controllen = sizeof(cmsgbuf); | |
745 | } | |
aba5acdf | 746 | |
aba5acdf | 747 | iov.iov_base = buf; |
aba5acdf | 748 | while (1) { |
449b824a ND |
749 | struct rtnl_ctrl_data ctrl; |
750 | struct cmsghdr *cmsg; | |
751 | ||
aba5acdf SH |
752 | iov.iov_len = sizeof(buf); |
753 | status = recvmsg(rtnl->fd, &msg, 0); | |
754 | ||
755 | if (status < 0) { | |
aa8032e6 | 756 | if (errno == EINTR || errno == EAGAIN) |
aba5acdf | 757 | continue; |
aa8032e6 SH |
758 | fprintf(stderr, "netlink receive error %s (%d)\n", |
759 | strerror(errno), errno); | |
7f03191f PM |
760 | if (errno == ENOBUFS) |
761 | continue; | |
aa8032e6 | 762 | return -1; |
aba5acdf SH |
763 | } |
764 | if (status == 0) { | |
765 | fprintf(stderr, "EOF on netlink\n"); | |
766 | return -1; | |
767 | } | |
768 | if (msg.msg_namelen != sizeof(nladdr)) { | |
2c500a4d SH |
769 | fprintf(stderr, |
770 | "Sender address length == %d\n", | |
771 | msg.msg_namelen); | |
aba5acdf SH |
772 | exit(1); |
773 | } | |
449b824a ND |
774 | |
775 | if (rtnl->flags & RTNL_HANDLE_F_LISTEN_ALL_NSID) { | |
776 | memset(&ctrl, 0, sizeof(ctrl)); | |
777 | ctrl.nsid = -1; | |
778 | for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; | |
779 | cmsg = CMSG_NXTHDR(&msg, cmsg)) | |
780 | if (cmsg->cmsg_level == SOL_NETLINK && | |
781 | cmsg->cmsg_type == NETLINK_LISTEN_ALL_NSID && | |
782 | cmsg->cmsg_len == CMSG_LEN(sizeof(int))) { | |
783 | int *data = (int *)CMSG_DATA(cmsg); | |
784 | ||
785 | ctrl.nsid = *data; | |
786 | } | |
787 | } | |
788 | ||
2c500a4d | 789 | for (h = (struct nlmsghdr *)buf; status >= sizeof(*h); ) { |
aba5acdf SH |
790 | int err; |
791 | int len = h->nlmsg_len; | |
792 | int l = len - sizeof(*h); | |
793 | ||
2c500a4d | 794 | if (l < 0 || len > status) { |
aba5acdf SH |
795 | if (msg.msg_flags & MSG_TRUNC) { |
796 | fprintf(stderr, "Truncated message\n"); | |
797 | return -1; | |
798 | } | |
2c500a4d SH |
799 | fprintf(stderr, |
800 | "!!!malformed message: len=%d\n", | |
801 | len); | |
aba5acdf SH |
802 | exit(1); |
803 | } | |
804 | ||
449b824a | 805 | err = handler(&nladdr, &ctrl, h, jarg); |
aba5acdf SH |
806 | if (err < 0) |
807 | return err; | |
808 | ||
809 | status -= NLMSG_ALIGN(len); | |
2c500a4d | 810 | h = (struct nlmsghdr *)((char *)h + NLMSG_ALIGN(len)); |
aba5acdf SH |
811 | } |
812 | if (msg.msg_flags & MSG_TRUNC) { | |
813 | fprintf(stderr, "Message truncated\n"); | |
814 | continue; | |
815 | } | |
816 | if (status) { | |
817 | fprintf(stderr, "!!!Remnant of size %d\n", status); | |
818 | exit(1); | |
819 | } | |
820 | } | |
821 | } | |
822 | ||
0628cddd | 823 | int rtnl_from_file(FILE *rtnl, rtnl_listen_filter_t handler, |
6dc9f016 | 824 | void *jarg) |
aba5acdf SH |
825 | { |
826 | int status; | |
d17b136f | 827 | struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK }; |
2c500a4d SH |
828 | char buf[16384]; |
829 | struct nlmsghdr *h = (struct nlmsghdr *)buf; | |
aba5acdf | 830 | |
aba5acdf | 831 | while (1) { |
2dd9f8e0 | 832 | int err, len; |
aba5acdf SH |
833 | int l; |
834 | ||
835 | status = fread(&buf, 1, sizeof(*h), rtnl); | |
836 | ||
837 | if (status < 0) { | |
838 | if (errno == EINTR) | |
839 | continue; | |
840 | perror("rtnl_from_file: fread"); | |
841 | return -1; | |
842 | } | |
843 | if (status == 0) | |
844 | return 0; | |
845 | ||
846 | len = h->nlmsg_len; | |
aba5acdf SH |
847 | l = len - sizeof(*h); |
848 | ||
2c500a4d | 849 | if (l < 0 || len > sizeof(buf)) { |
aba5acdf SH |
850 | fprintf(stderr, "!!!malformed message: len=%d @%lu\n", |
851 | len, ftell(rtnl)); | |
852 | return -1; | |
853 | } | |
854 | ||
855 | status = fread(NLMSG_DATA(h), 1, NLMSG_ALIGN(l), rtnl); | |
856 | ||
857 | if (status < 0) { | |
858 | perror("rtnl_from_file: fread"); | |
859 | return -1; | |
860 | } | |
861 | if (status < l) { | |
862 | fprintf(stderr, "rtnl-from_file: truncated message\n"); | |
863 | return -1; | |
864 | } | |
865 | ||
0628cddd | 866 | err = handler(&nladdr, NULL, h, jarg); |
aba5acdf SH |
867 | if (err < 0) |
868 | return err; | |
869 | } | |
870 | } | |
871 | ||
2aa3dd29 SH |
872 | int addattr(struct nlmsghdr *n, int maxlen, int type) |
873 | { | |
874 | return addattr_l(n, maxlen, type, NULL, 0); | |
875 | } | |
876 | ||
877 | int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data) | |
878 | { | |
879 | return addattr_l(n, maxlen, type, &data, sizeof(__u8)); | |
880 | } | |
881 | ||
882 | int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data) | |
883 | { | |
884 | return addattr_l(n, maxlen, type, &data, sizeof(__u16)); | |
885 | } | |
886 | ||
aba5acdf SH |
887 | int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data) |
888 | { | |
2aa3dd29 SH |
889 | return addattr_l(n, maxlen, type, &data, sizeof(__u32)); |
890 | } | |
891 | ||
892 | int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data) | |
893 | { | |
894 | return addattr_l(n, maxlen, type, &data, sizeof(__u64)); | |
895 | } | |
896 | ||
897 | int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *str) | |
898 | { | |
899 | return addattr_l(n, maxlen, type, str, strlen(str)+1); | |
aba5acdf SH |
900 | } |
901 | ||
8ed63ab1 | 902 | int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data, |
6dc9f016 | 903 | int alen) |
aba5acdf SH |
904 | { |
905 | int len = RTA_LENGTH(alen); | |
906 | struct rtattr *rta; | |
907 | ||
3dabdbb3 | 908 | if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) { |
2c500a4d SH |
909 | fprintf(stderr, |
910 | "addattr_l ERROR: message exceeded bound of %d\n", | |
911 | maxlen); | |
aba5acdf | 912 | return -1; |
007d3a3e | 913 | } |
07f94362 | 914 | rta = NLMSG_TAIL(n); |
aba5acdf SH |
915 | rta->rta_type = type; |
916 | rta->rta_len = len; | |
893deac4 PS |
917 | if (alen) |
918 | memcpy(RTA_DATA(rta), data, alen); | |
3dabdbb3 | 919 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len); |
aba5acdf SH |
920 | return 0; |
921 | } | |
922 | ||
07f94362 | 923 | int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len) |
924 | { | |
925 | if (NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len) > maxlen) { | |
2c500a4d SH |
926 | fprintf(stderr, |
927 | "addraw_l ERROR: message exceeded bound of %d\n", | |
928 | maxlen); | |
07f94362 | 929 | return -1; |
930 | } | |
931 | ||
932 | memcpy(NLMSG_TAIL(n), data, len); | |
933 | memset((void *) NLMSG_TAIL(n) + len, 0, NLMSG_ALIGN(len) - len); | |
934 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len); | |
935 | return 0; | |
936 | } | |
937 | ||
2f90c9c0 PM |
938 | struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type) |
939 | { | |
940 | struct rtattr *nest = NLMSG_TAIL(n); | |
941 | ||
942 | addattr_l(n, maxlen, type, NULL, 0); | |
943 | return nest; | |
944 | } | |
945 | ||
946 | int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest) | |
947 | { | |
948 | nest->rta_len = (void *)NLMSG_TAIL(n) - (void *)nest; | |
949 | return n->nlmsg_len; | |
950 | } | |
951 | ||
952 | struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type, | |
953 | const void *data, int len) | |
954 | { | |
955 | struct rtattr *start = NLMSG_TAIL(n); | |
956 | ||
957 | addattr_l(n, maxlen, type, data, len); | |
958 | addattr_nest(n, maxlen, type); | |
959 | return start; | |
960 | } | |
961 | ||
962 | int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *start) | |
963 | { | |
964 | struct rtattr *nest = (void *)start + NLMSG_ALIGN(start->rta_len); | |
965 | ||
966 | start->rta_len = (void *)NLMSG_TAIL(n) - (void *)start; | |
967 | addattr_nest_end(n, nest); | |
968 | return n->nlmsg_len; | |
969 | } | |
970 | ||
aba5acdf SH |
971 | int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data) |
972 | { | |
973 | int len = RTA_LENGTH(4); | |
974 | struct rtattr *subrta; | |
975 | ||
007d3a3e | 976 | if (RTA_ALIGN(rta->rta_len) + len > maxlen) { |
2c500a4d SH |
977 | fprintf(stderr, |
978 | "rta_addattr32: Error! max allowed bound %d exceeded\n", | |
979 | maxlen); | |
aba5acdf | 980 | return -1; |
007d3a3e | 981 | } |
2c500a4d | 982 | subrta = (struct rtattr *)(((char *)rta) + RTA_ALIGN(rta->rta_len)); |
aba5acdf SH |
983 | subrta->rta_type = type; |
984 | subrta->rta_len = len; | |
985 | memcpy(RTA_DATA(subrta), &data, 4); | |
986 | rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len; | |
987 | return 0; | |
988 | } | |
989 | ||
8ed63ab1 | 990 | int rta_addattr_l(struct rtattr *rta, int maxlen, int type, |
6dc9f016 | 991 | const void *data, int alen) |
aba5acdf SH |
992 | { |
993 | struct rtattr *subrta; | |
994 | int len = RTA_LENGTH(alen); | |
995 | ||
3dabdbb3 | 996 | if (RTA_ALIGN(rta->rta_len) + RTA_ALIGN(len) > maxlen) { |
2c500a4d SH |
997 | fprintf(stderr, |
998 | "rta_addattr_l: Error! max allowed bound %d exceeded\n", | |
999 | maxlen); | |
aba5acdf | 1000 | return -1; |
007d3a3e | 1001 | } |
2c500a4d | 1002 | subrta = (struct rtattr *)(((char *)rta) + RTA_ALIGN(rta->rta_len)); |
aba5acdf SH |
1003 | subrta->rta_type = type; |
1004 | subrta->rta_len = len; | |
893deac4 PS |
1005 | if (alen) |
1006 | memcpy(RTA_DATA(subrta), data, alen); | |
3dabdbb3 | 1007 | rta->rta_len = NLMSG_ALIGN(rta->rta_len) + RTA_ALIGN(len); |
aba5acdf SH |
1008 | return 0; |
1009 | } | |
1010 | ||
303cc9cb RP |
1011 | int rta_addattr8(struct rtattr *rta, int maxlen, int type, __u8 data) |
1012 | { | |
1013 | return rta_addattr_l(rta, maxlen, type, &data, sizeof(__u8)); | |
1014 | } | |
1015 | ||
1016 | int rta_addattr16(struct rtattr *rta, int maxlen, int type, __u16 data) | |
1017 | { | |
1018 | return rta_addattr_l(rta, maxlen, type, &data, sizeof(__u16)); | |
1019 | } | |
1020 | ||
1021 | int rta_addattr64(struct rtattr *rta, int maxlen, int type, __u64 data) | |
1022 | { | |
1023 | return rta_addattr_l(rta, maxlen, type, &data, sizeof(__u64)); | |
1024 | } | |
1025 | ||
1026 | struct rtattr *rta_nest(struct rtattr *rta, int maxlen, int type) | |
1027 | { | |
1028 | struct rtattr *nest = RTA_TAIL(rta); | |
1029 | ||
1030 | rta_addattr_l(rta, maxlen, type, NULL, 0); | |
1031 | ||
1032 | return nest; | |
1033 | } | |
1034 | ||
1035 | int rta_nest_end(struct rtattr *rta, struct rtattr *nest) | |
1036 | { | |
1037 | nest->rta_len = (void *)RTA_TAIL(rta) - (void *)nest; | |
1038 | ||
1039 | return rta->rta_len; | |
1040 | } | |
1041 | ||
aba5acdf SH |
1042 | int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len) |
1043 | { | |
b1b7ce0f VY |
1044 | return parse_rtattr_flags(tb, max, rta, len, 0); |
1045 | } | |
1046 | ||
1047 | int parse_rtattr_flags(struct rtattr *tb[], int max, struct rtattr *rta, | |
1048 | int len, unsigned short flags) | |
1049 | { | |
1050 | unsigned short type; | |
1051 | ||
175e2440 | 1052 | memset(tb, 0, sizeof(struct rtattr *) * (max + 1)); |
aba5acdf | 1053 | while (RTA_OK(rta, len)) { |
b1b7ce0f VY |
1054 | type = rta->rta_type & ~flags; |
1055 | if ((type <= max) && (!tb[type])) | |
1056 | tb[type] = rta; | |
2c500a4d | 1057 | rta = RTA_NEXT(rta, len); |
aba5acdf SH |
1058 | } |
1059 | if (len) | |
2c500a4d SH |
1060 | fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", |
1061 | len, rta->rta_len); | |
aba5acdf SH |
1062 | return 0; |
1063 | } | |
c7699875 | 1064 | |
2c500a4d SH |
1065 | int parse_rtattr_byindex(struct rtattr *tb[], int max, |
1066 | struct rtattr *rta, int len) | |
c7699875 | 1067 | { |
1068 | int i = 0; | |
175e2440 SH |
1069 | |
1070 | memset(tb, 0, sizeof(struct rtattr *) * max); | |
c7699875 | 1071 | while (RTA_OK(rta, len)) { |
175e2440 | 1072 | if (rta->rta_type <= max && i < max) |
c7699875 | 1073 | tb[i++] = rta; |
2c500a4d | 1074 | rta = RTA_NEXT(rta, len); |
c7699875 | 1075 | } |
1076 | if (len) | |
2c500a4d SH |
1077 | fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", |
1078 | len, rta->rta_len); | |
c7699875 | 1079 | return i; |
1080 | } | |
2f90c9c0 | 1081 | |
decbb437 JP |
1082 | struct rtattr *parse_rtattr_one(int type, struct rtattr *rta, int len) |
1083 | { | |
1084 | while (RTA_OK(rta, len)) { | |
1085 | if (rta->rta_type == type) | |
1086 | return rta; | |
1087 | rta = RTA_NEXT(rta, len); | |
1088 | } | |
2c500a4d | 1089 | |
decbb437 | 1090 | if (len) |
2c500a4d SH |
1091 | fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", |
1092 | len, rta->rta_len); | |
decbb437 JP |
1093 | return NULL; |
1094 | } | |
1095 | ||
2c500a4d SH |
1096 | int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, |
1097 | struct rtattr *rta, | |
1098 | int len) | |
2f90c9c0 PM |
1099 | { |
1100 | if (RTA_PAYLOAD(rta) < len) | |
1101 | return -1; | |
1102 | if (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr)) { | |
1103 | rta = RTA_DATA(rta) + RTA_ALIGN(len); | |
1104 | return parse_rtattr_nested(tb, max, rta); | |
1105 | } | |
037c635e | 1106 | memset(tb, 0, sizeof(struct rtattr *) * (max + 1)); |
2f90c9c0 PM |
1107 | return 0; |
1108 | } |