blob: 547013ff63ffb6411dfa83535b1c30993c048ff6 [file] [log] [blame]
"Robert P. J. Day"63fc1a92006-07-02 19:47:05 +00001/* vi: set sw=4 ts=4: */
Glenn L McGrath9a2d2722002-11-10 01:33:55 +00002/*
Natanael Copab78ac5a2010-07-23 01:31:24 +02003 * 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.
Glenn L McGrath9a2d2722002-11-10 01:33:55 +00007 *
Natanael Copab78ac5a2010-07-23 01:31:24 +02008 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
Glenn L McGrath9a2d2722002-11-10 01:33:55 +00009 */
10
Glenn L McGrath9a2d2722002-11-10 01:33:55 +000011#include <sys/socket.h>
Eric Andersen0f08e532003-06-20 09:05:00 +000012#include <sys/uio.h>
13
Denis Vlasenkofad2b862007-05-31 22:16:38 +000014#include "libbb.h"
Glenn L McGrath9a2d2722002-11-10 01:33:55 +000015#include "libnetlink.h"
16
Natanael Copab78ac5a2010-07-23 01:31:24 +020017void FAST_FUNC xrtnl_open(struct rtnl_handle *rth/*, unsigned subscriptions*/)
Glenn L McGrath9a2d2722002-11-10 01:33:55 +000018{
Eric Andersend78aea82006-01-30 18:00:02 +000019 socklen_t addr_len;
Glenn L McGrath9a2d2722002-11-10 01:33:55 +000020
Denis Vlasenkoa771e7c2009-04-21 23:48:38 +000021 memset(rth, 0, sizeof(*rth));
Bernhard Reutner-Fischerb2908892007-04-12 11:34:39 +000022 rth->fd = xsocket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
Glenn L McGrath9a2d2722002-11-10 01:33:55 +000023 rth->local.nl_family = AF_NETLINK;
Bernhard Reutner-Fischerb2908892007-04-12 11:34:39 +000024 /*rth->local.nl_groups = subscriptions;*/
Glenn L McGrath9a2d2722002-11-10 01:33:55 +000025
Bernhard Reutner-Fischerb2908892007-04-12 11:34:39 +000026 xbind(rth->fd, (struct sockaddr*)&rth->local, sizeof(rth->local));
Glenn L McGrath9a2d2722002-11-10 01:33:55 +000027 addr_len = sizeof(rth->local);
Denis Vlasenkoa771e7c2009-04-21 23:48:38 +000028 getsockname(rth->fd, (struct sockaddr*)&rth->local, &addr_len);
29
30/* too much paranoia
Bernhard Reutner-Fischerb2908892007-04-12 11:34:39 +000031 if (getsockname(rth->fd, (struct sockaddr*)&rth->local, &addr_len) < 0)
Bernhard Reutner-Fischerd73cbd32008-07-21 14:41:33 +000032 bb_perror_msg_and_die("getsockname");
Bernhard Reutner-Fischerb2908892007-04-12 11:34:39 +000033 if (addr_len != sizeof(rth->local))
34 bb_error_msg_and_die("wrong address length %d", addr_len);
35 if (rth->local.nl_family != AF_NETLINK)
36 bb_error_msg_and_die("wrong address family %d", rth->local.nl_family);
Denis Vlasenkoa771e7c2009-04-21 23:48:38 +000037*/
Glenn L McGrath9a2d2722002-11-10 01:33:55 +000038 rth->seq = time(NULL);
Glenn L McGrath9a2d2722002-11-10 01:33:55 +000039}
40
Denis Vlasenko0db2c2e2008-06-29 06:22:40 +000041int FAST_FUNC xrtnl_wilddump_request(struct rtnl_handle *rth, int family, int type)
Glenn L McGrath9a2d2722002-11-10 01:33:55 +000042{
43 struct {
44 struct nlmsghdr nlh;
45 struct rtgenmsg g;
46 } req;
Glenn L McGrath9a2d2722002-11-10 01:33:55 +000047
48 req.nlh.nlmsg_len = sizeof(req);
49 req.nlh.nlmsg_type = type;
50 req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
51 req.nlh.nlmsg_pid = 0;
52 req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
53 req.g.rtgen_family = family;
54
Natanael Copab78ac5a2010-07-23 01:31:24 +020055 return rtnl_send(rth, (void*)&req, sizeof(req));
Glenn L McGrath9a2d2722002-11-10 01:33:55 +000056}
57
Denys Vlasenkof1334712011-02-09 04:39:09 +010058//TODO: pass rth->fd instead of full rth?
Denis Vlasenko0db2c2e2008-06-29 06:22:40 +000059int FAST_FUNC rtnl_send(struct rtnl_handle *rth, char *buf, int len)
Glenn L McGrath9a2d2722002-11-10 01:33:55 +000060{
61 struct sockaddr_nl nladdr;
62
63 memset(&nladdr, 0, sizeof(nladdr));
64 nladdr.nl_family = AF_NETLINK;
65
Bernhard Reutner-Fischerb2908892007-04-12 11:34:39 +000066 return xsendto(rth->fd, buf, len, (struct sockaddr*)&nladdr, sizeof(nladdr));
Glenn L McGrath9a2d2722002-11-10 01:33:55 +000067}
68
Denis Vlasenko0db2c2e2008-06-29 06:22:40 +000069int FAST_FUNC rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len)
Glenn L McGrath9a2d2722002-11-10 01:33:55 +000070{
71 struct nlmsghdr nlh;
72 struct sockaddr_nl nladdr;
73 struct iovec iov[2] = { { &nlh, sizeof(nlh) }, { req, len } };
74 struct msghdr msg = {
75 (void*)&nladdr, sizeof(nladdr),
Denys Vlasenkofb132e42010-10-29 11:46:52 +020076 iov, 2,
77 NULL, 0,
Glenn L McGrath9a2d2722002-11-10 01:33:55 +000078 0
79 };
80
81 memset(&nladdr, 0, sizeof(nladdr));
82 nladdr.nl_family = AF_NETLINK;
83
84 nlh.nlmsg_len = NLMSG_LENGTH(len);
85 nlh.nlmsg_type = type;
86 nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
87 nlh.nlmsg_pid = 0;
88 nlh.nlmsg_seq = rth->dump = ++rth->seq;
89
90 return sendmsg(rth->fd, &msg, 0);
91}
92
Bernhard Reutner-Fischerb2908892007-04-12 11:34:39 +000093static int rtnl_dump_filter(struct rtnl_handle *rth,
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020094 int (*filter)(const struct sockaddr_nl *, struct nlmsghdr *n, void *) FAST_FUNC,
Bernhard Reutner-Fischerb2908892007-04-12 11:34:39 +000095 void *arg1/*,
Bernhard Reutner-Fischer921f5df2006-11-21 15:36:08 +000096 int (*junk)(struct sockaddr_nl *, struct nlmsghdr *n, void *),
Bernhard Reutner-Fischerb2908892007-04-12 11:34:39 +000097 void *arg2*/)
Glenn L McGrath9a2d2722002-11-10 01:33:55 +000098{
Denis Vlasenko8723a942007-12-02 06:30:57 +000099 int retval = -1;
100 char *buf = xmalloc(8*1024); /* avoid big stack buffer */
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000101 struct sockaddr_nl nladdr;
Denis Vlasenko8723a942007-12-02 06:30:57 +0000102 struct iovec iov = { buf, 8*1024 };
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000103
104 while (1) {
105 int status;
106 struct nlmsghdr *h;
107
108 struct msghdr msg = {
109 (void*)&nladdr, sizeof(nladdr),
Denys Vlasenkofb132e42010-10-29 11:46:52 +0200110 &iov, 1,
111 NULL, 0,
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000112 0
113 };
114
115 status = recvmsg(rth->fd, &msg, 0);
116
117 if (status < 0) {
118 if (errno == EINTR)
119 continue;
Manuel Novoa III cad53642003-03-19 09:13:01 +0000120 bb_perror_msg("OVERRUN");
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000121 continue;
122 }
123 if (status == 0) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000124 bb_error_msg("EOF on netlink");
Denis Vlasenko8723a942007-12-02 06:30:57 +0000125 goto ret;
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000126 }
127 if (msg.msg_namelen != sizeof(nladdr)) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000128 bb_error_msg_and_die("sender address length == %d", msg.msg_namelen);
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000129 }
130
131 h = (struct nlmsghdr*)buf;
132 while (NLMSG_OK(h, status)) {
133 int err;
134
Eric Andersen6c8161d2004-05-05 07:05:32 +0000135 if (nladdr.nl_pid != 0 ||
136 h->nlmsg_pid != rth->local.nl_pid ||
Denys Vlasenko6b9f1632010-01-28 02:24:24 +0100137 h->nlmsg_seq != rth->dump
138 ) {
Denis Vlasenko8723a942007-12-02 06:30:57 +0000139// if (junk) {
140// err = junk(&nladdr, h, arg2);
141// if (err < 0) {
142// retval = err;
143// goto ret;
144// }
145// }
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000146 goto skip_it;
147 }
148
Glenn L McGrathd4de9752002-11-28 12:35:46 +0000149 if (h->nlmsg_type == NLMSG_DONE) {
Denis Vlasenko8723a942007-12-02 06:30:57 +0000150 goto ret_0;
Glenn L McGrathd4de9752002-11-28 12:35:46 +0000151 }
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000152 if (h->nlmsg_type == NLMSG_ERROR) {
Glenn L McGrathd4de9752002-11-28 12:35:46 +0000153 struct nlmsgerr *l_err = (struct nlmsgerr*)NLMSG_DATA(h);
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000154 if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000155 bb_error_msg("ERROR truncated");
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000156 } else {
Glenn L McGrathd4de9752002-11-28 12:35:46 +0000157 errno = -l_err->error;
Manuel Novoa III cad53642003-03-19 09:13:01 +0000158 bb_perror_msg("RTNETLINK answers");
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000159 }
Denis Vlasenko8723a942007-12-02 06:30:57 +0000160 goto ret;
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000161 }
162 err = filter(&nladdr, h, arg1);
Denis Vlasenko8723a942007-12-02 06:30:57 +0000163 if (err < 0) {
164 retval = err;
165 goto ret;
166 }
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000167
Denis Vlasenko8723a942007-12-02 06:30:57 +0000168 skip_it:
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000169 h = NLMSG_NEXT(h, status);
170 }
171 if (msg.msg_flags & MSG_TRUNC) {
Denis Vlasenkod3d004d2006-10-27 09:02:31 +0000172 bb_error_msg("message truncated");
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000173 continue;
174 }
175 if (status) {
Denis Vlasenkod3d004d2006-10-27 09:02:31 +0000176 bb_error_msg_and_die("remnant of size %d!", status);
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000177 }
Denis Vlasenko8723a942007-12-02 06:30:57 +0000178 } /* while (1) */
179 ret_0:
180 retval++; /* = 0 */
181 ret:
182 free(buf);
183 return retval;
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000184}
185
Denis Vlasenko0db2c2e2008-06-29 06:22:40 +0000186int FAST_FUNC xrtnl_dump_filter(struct rtnl_handle *rth,
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +0200187 int (*filter)(const struct sockaddr_nl *, struct nlmsghdr *, void *) FAST_FUNC,
Bernhard Reutner-Fischerb2908892007-04-12 11:34:39 +0000188 void *arg1)
189{
190 int ret = rtnl_dump_filter(rth, filter, arg1/*, NULL, NULL*/);
191 if (ret < 0)
192 bb_error_msg_and_die("dump terminated");
193 return ret;
194}
195
Denis Vlasenko0db2c2e2008-06-29 06:22:40 +0000196int FAST_FUNC rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +0200197 pid_t peer, unsigned groups,
198 struct nlmsghdr *answer,
199 int (*junk)(struct sockaddr_nl *, struct nlmsghdr *, void *),
200 void *jarg)
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000201{
Denis Vlasenko8723a942007-12-02 06:30:57 +0000202/* bbox doesn't use parameters no. 3, 4, 6, 7, they are stubbed out */
203#define peer 0
204#define groups 0
205#define junk NULL
206#define jarg NULL
207 int retval = -1;
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000208 int status;
209 unsigned seq;
210 struct nlmsghdr *h;
211 struct sockaddr_nl nladdr;
212 struct iovec iov = { (void*)n, n->nlmsg_len };
Denis Vlasenko8723a942007-12-02 06:30:57 +0000213 char *buf = xmalloc(8*1024); /* avoid big stack buffer */
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000214 struct msghdr msg = {
215 (void*)&nladdr, sizeof(nladdr),
Denys Vlasenkofb132e42010-10-29 11:46:52 +0200216 &iov, 1,
217 NULL, 0,
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000218 0
219 };
220
221 memset(&nladdr, 0, sizeof(nladdr));
222 nladdr.nl_family = AF_NETLINK;
Denis Vlasenko8723a942007-12-02 06:30:57 +0000223// nladdr.nl_pid = peer;
224// nladdr.nl_groups = groups;
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000225
226 n->nlmsg_seq = seq = ++rtnl->seq;
Glenn L McGrathd4de9752002-11-28 12:35:46 +0000227 if (answer == NULL) {
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000228 n->nlmsg_flags |= NLM_F_ACK;
Glenn L McGrathd4de9752002-11-28 12:35:46 +0000229 }
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000230 status = sendmsg(rtnl->fd, &msg, 0);
231
232 if (status < 0) {
Denys Vlasenko6331cf02009-11-13 09:08:27 +0100233 bb_perror_msg("can't talk to rtnetlink");
Denis Vlasenko8723a942007-12-02 06:30:57 +0000234 goto ret;
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000235 }
236
237 iov.iov_base = buf;
238
239 while (1) {
Denis Vlasenko8723a942007-12-02 06:30:57 +0000240 iov.iov_len = 8*1024;
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000241 status = recvmsg(rtnl->fd, &msg, 0);
242
243 if (status < 0) {
Glenn L McGrathd4de9752002-11-28 12:35:46 +0000244 if (errno == EINTR) {
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000245 continue;
Glenn L McGrathd4de9752002-11-28 12:35:46 +0000246 }
Manuel Novoa III cad53642003-03-19 09:13:01 +0000247 bb_perror_msg("OVERRUN");
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000248 continue;
249 }
250 if (status == 0) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000251 bb_error_msg("EOF on netlink");
Denis Vlasenko8723a942007-12-02 06:30:57 +0000252 goto ret;
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000253 }
254 if (msg.msg_namelen != sizeof(nladdr)) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000255 bb_error_msg_and_die("sender address length == %d", msg.msg_namelen);
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000256 }
Denis Vlasenko6b06cb82008-05-15 21:30:45 +0000257 for (h = (struct nlmsghdr*)buf; status >= (int)sizeof(*h); ) {
Denis Vlasenko8723a942007-12-02 06:30:57 +0000258// int l_err;
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000259 int len = h->nlmsg_len;
260 int l = len - sizeof(*h);
261
Denis Vlasenko8723a942007-12-02 06:30:57 +0000262 if (l < 0 || len > status) {
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000263 if (msg.msg_flags & MSG_TRUNC) {
Denis Vlasenkod3d004d2006-10-27 09:02:31 +0000264 bb_error_msg("truncated message");
Denis Vlasenko8723a942007-12-02 06:30:57 +0000265 goto ret;
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000266 }
Denis Vlasenkod3d004d2006-10-27 09:02:31 +0000267 bb_error_msg_and_die("malformed message: len=%d!", len);
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000268 }
269
Eric Andersen6c8161d2004-05-05 07:05:32 +0000270 if (nladdr.nl_pid != peer ||
271 h->nlmsg_pid != rtnl->local.nl_pid ||
Denys Vlasenko6b9f1632010-01-28 02:24:24 +0100272 h->nlmsg_seq != seq
273 ) {
Denis Vlasenko8723a942007-12-02 06:30:57 +0000274// if (junk) {
275// l_err = junk(&nladdr, h, jarg);
276// if (l_err < 0) {
277// retval = l_err;
278// goto ret;
279// }
280// }
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000281 continue;
282 }
283
284 if (h->nlmsg_type == NLMSG_ERROR) {
285 struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h);
Denis Vlasenko6b06cb82008-05-15 21:30:45 +0000286 if (l < (int)sizeof(struct nlmsgerr)) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000287 bb_error_msg("ERROR truncated");
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000288 } else {
Denis Vlasenko8723a942007-12-02 06:30:57 +0000289 errno = - err->error;
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000290 if (errno == 0) {
Glenn L McGrathd4de9752002-11-28 12:35:46 +0000291 if (answer) {
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000292 memcpy(answer, h, h->nlmsg_len);
Glenn L McGrathd4de9752002-11-28 12:35:46 +0000293 }
Denis Vlasenko8723a942007-12-02 06:30:57 +0000294 goto ret_0;
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000295 }
Manuel Novoa III cad53642003-03-19 09:13:01 +0000296 bb_perror_msg("RTNETLINK answers");
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000297 }
Denis Vlasenko8723a942007-12-02 06:30:57 +0000298 goto ret;
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000299 }
300 if (answer) {
301 memcpy(answer, h, h->nlmsg_len);
Denis Vlasenko8723a942007-12-02 06:30:57 +0000302 goto ret_0;
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000303 }
304
Denis Vlasenkod3d004d2006-10-27 09:02:31 +0000305 bb_error_msg("unexpected reply!");
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000306
307 status -= NLMSG_ALIGN(len);
308 h = (struct nlmsghdr*)((char*)h + NLMSG_ALIGN(len));
309 }
310 if (msg.msg_flags & MSG_TRUNC) {
Denis Vlasenkod3d004d2006-10-27 09:02:31 +0000311 bb_error_msg("message truncated");
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000312 continue;
313 }
314 if (status) {
Denis Vlasenkod3d004d2006-10-27 09:02:31 +0000315 bb_error_msg_and_die("remnant of size %d!", status);
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000316 }
Denis Vlasenko8723a942007-12-02 06:30:57 +0000317 } /* while (1) */
318 ret_0:
319 retval++; /* = 0 */
320 ret:
321 free(buf);
322 return retval;
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000323}
324
Denis Vlasenko0db2c2e2008-06-29 06:22:40 +0000325int FAST_FUNC addattr32(struct nlmsghdr *n, int maxlen, int type, uint32_t data)
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000326{
327 int len = RTA_LENGTH(4);
328 struct rtattr *rta;
Natanael Copab78ac5a2010-07-23 01:31:24 +0200329
330 if ((int)(NLMSG_ALIGN(n->nlmsg_len) + len) > maxlen) {
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000331 return -1;
Natanael Copab78ac5a2010-07-23 01:31:24 +0200332 }
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000333 rta = (struct rtattr*)(((char*)n) + NLMSG_ALIGN(n->nlmsg_len));
334 rta->rta_type = type;
335 rta->rta_len = len;
Denis Vlasenkoefb545b2008-12-08 22:56:18 +0000336 move_to_unaligned32(RTA_DATA(rta), data);
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000337 n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len;
338 return 0;
339}
340
Denis Vlasenko0db2c2e2008-06-29 06:22:40 +0000341int FAST_FUNC addattr_l(struct nlmsghdr *n, int maxlen, int type, void *data, int alen)
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000342{
343 int len = RTA_LENGTH(alen);
344 struct rtattr *rta;
345
Natanael Copab78ac5a2010-07-23 01:31:24 +0200346 if ((int)(NLMSG_ALIGN(n->nlmsg_len) + len) > maxlen) {
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000347 return -1;
Natanael Copab78ac5a2010-07-23 01:31:24 +0200348 }
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000349 rta = (struct rtattr*)(((char*)n) + NLMSG_ALIGN(n->nlmsg_len));
350 rta->rta_type = type;
351 rta->rta_len = len;
352 memcpy(RTA_DATA(rta), data, alen);
353 n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len;
354 return 0;
355}
356
Denis Vlasenko0db2c2e2008-06-29 06:22:40 +0000357int FAST_FUNC rta_addattr32(struct rtattr *rta, int maxlen, int type, uint32_t data)
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000358{
359 int len = RTA_LENGTH(4);
360 struct rtattr *subrta;
361
Glenn L McGrathd4de9752002-11-28 12:35:46 +0000362 if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000363 return -1;
Glenn L McGrathd4de9752002-11-28 12:35:46 +0000364 }
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000365 subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len));
366 subrta->rta_type = type;
367 subrta->rta_len = len;
Denis Vlasenkoefb545b2008-12-08 22:56:18 +0000368 move_to_unaligned32(RTA_DATA(subrta), data);
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000369 rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len;
370 return 0;
371}
372
Denis Vlasenko0db2c2e2008-06-29 06:22:40 +0000373int FAST_FUNC rta_addattr_l(struct rtattr *rta, int maxlen, int type, void *data, int alen)
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000374{
375 struct rtattr *subrta;
376 int len = RTA_LENGTH(alen);
377
Glenn L McGrathd4de9752002-11-28 12:35:46 +0000378 if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000379 return -1;
Glenn L McGrathd4de9752002-11-28 12:35:46 +0000380 }
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000381 subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len));
382 subrta->rta_type = type;
383 subrta->rta_len = len;
384 memcpy(RTA_DATA(subrta), data, alen);
385 rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len;
386 return 0;
387}
388
389
Natanael Copab78ac5a2010-07-23 01:31:24 +0200390void FAST_FUNC parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len)
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000391{
392 while (RTA_OK(rta, len)) {
Glenn L McGrathd4de9752002-11-28 12:35:46 +0000393 if (rta->rta_type <= max) {
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000394 tb[rta->rta_type] = rta;
Glenn L McGrathd4de9752002-11-28 12:35:46 +0000395 }
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000396 rta = RTA_NEXT(rta,len);
397 }
Glenn L McGrathd4de9752002-11-28 12:35:46 +0000398 if (len) {
Denis Vlasenkod3d004d2006-10-27 09:02:31 +0000399 bb_error_msg("deficit %d, rta_len=%d!", len, rta->rta_len);
Glenn L McGrathd4de9752002-11-28 12:35:46 +0000400 }
Glenn L McGrath9a2d2722002-11-10 01:33:55 +0000401}