networking/libiproute/libnetlink.c

/* vi: set sw=4 ts=4: */
/*
 * libnetlink.c	RTnetlink service routines.
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 */

#include <sys/socket.h>
#include <sys/uio.h>

#include "libbb.h"
#include "libnetlink.h"

void FAST_FUNC rtnl_close(struct rtnl_handle *rth)
{
	close(rth->fd);
}

int FAST_FUNC xrtnl_open(struct rtnl_handle *rth/*, unsigned subscriptions*/)
{
	socklen_t addr_len;

	memset(rth, 0, sizeof(*rth));
	rth->fd = xsocket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
	rth->local.nl_family = AF_NETLINK;
	/*rth->local.nl_groups = subscriptions;*/

	xbind(rth->fd, (struct sockaddr*)&rth->local, sizeof(rth->local));
	addr_len = sizeof(rth->local);
	getsockname(rth->fd, (struct sockaddr*)&rth->local, &addr_len);

/* too much paranoia
	if (getsockname(rth->fd, (struct sockaddr*)&rth->local, &addr_len) < 0)
		bb_perror_msg_and_die("getsockname");
	if (addr_len != sizeof(rth->local))
		bb_error_msg_and_die("wrong address length %d", addr_len);
	if (rth->local.nl_family != AF_NETLINK)
		bb_error_msg_and_die("wrong address family %d", rth->local.nl_family);
*/
	rth->seq = time(NULL);
	return 0;
}

int FAST_FUNC xrtnl_wilddump_request(struct rtnl_handle *rth, int family, int type)
{
	struct {
		struct nlmsghdr nlh;
		struct rtgenmsg g;
	} req;
	struct sockaddr_nl nladdr;

	memset(&nladdr, 0, sizeof(nladdr));
	nladdr.nl_family = AF_NETLINK;

	req.nlh.nlmsg_len = sizeof(req);
	req.nlh.nlmsg_type = type;
	req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
	req.nlh.nlmsg_pid = 0;
	req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
	req.g.rtgen_family = family;

	return xsendto(rth->fd, (void*)&req, sizeof(req),
				 (struct sockaddr*)&nladdr, sizeof(nladdr));
}

int FAST_FUNC rtnl_send(struct rtnl_handle *rth, char *buf, int len)
{
	struct sockaddr_nl nladdr;

	memset(&nladdr, 0, sizeof(nladdr));
	nladdr.nl_family = AF_NETLINK;

	return xsendto(rth->fd, buf, len, (struct sockaddr*)&nladdr, sizeof(nladdr));
}

int FAST_FUNC rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len)
{
	struct nlmsghdr nlh;
	struct sockaddr_nl nladdr;
	struct iovec iov[2] = { { &nlh, sizeof(nlh) }, { req, len } };
	struct msghdr msg = {
		(void*)&nladdr, sizeof(nladdr),
		iov,	2,
		NULL,	0,
		0
	};

	memset(&nladdr, 0, sizeof(nladdr));
	nladdr.nl_family = AF_NETLINK;

	nlh.nlmsg_len = NLMSG_LENGTH(len);
	nlh.nlmsg_type = type;
	nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
	nlh.nlmsg_pid = 0;
	nlh.nlmsg_seq = rth->dump = ++rth->seq;

	return sendmsg(rth->fd, &msg, 0);
}

static int rtnl_dump_filter(struct rtnl_handle *rth,
		int (*filter)(const struct sockaddr_nl *, struct nlmsghdr *n, void *) FAST_FUNC,
		void *arg1/*,
		int (*junk)(struct sockaddr_nl *, struct nlmsghdr *n, void *),
		void *arg2*/)
{
	int retval = -1;
	char *buf = xmalloc(8*1024); /* avoid big stack buffer */
	struct sockaddr_nl nladdr;
	struct iovec iov = { buf, 8*1024 };

	while (1) {
		int status;
		struct nlmsghdr *h;

		struct msghdr msg = {
			(void*)&nladdr, sizeof(nladdr),
			&iov,	1,
			NULL,	0,
			0
		};

		status = recvmsg(rth->fd, &msg, 0);

		if (status < 0) {
			if (errno == EINTR)
				continue;
			bb_perror_msg("OVERRUN");
			continue;
		}
		if (status == 0) {
			bb_error_msg("EOF on netlink");
			goto ret;
		}
		if (msg.msg_namelen != sizeof(nladdr)) {
			bb_error_msg_and_die("sender address length == %d", msg.msg_namelen);
		}

		h = (struct nlmsghdr*)buf;
		while (NLMSG_OK(h, status)) {
			int err;

			if (nladdr.nl_pid != 0 ||
			    h->nlmsg_pid != rth->local.nl_pid ||
			    h->nlmsg_seq != rth->dump) {
//				if (junk) {
//					err = junk(&nladdr, h, arg2);
//					if (err < 0) {
//						retval = err;
//						goto ret;
//					}
//				}
				goto skip_it;
			}

			if (h->nlmsg_type == NLMSG_DONE) {
				goto ret_0;
			}
			if (h->nlmsg_type == NLMSG_ERROR) {
				struct nlmsgerr *l_err = (struct nlmsgerr*)NLMSG_DATA(h);
				if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) {
					bb_error_msg("ERROR truncated");
				} else {
					errno = -l_err->error;
					bb_perror_msg("RTNETLINK answers");
				}
				goto ret;
			}
			err = filter(&nladdr, h, arg1);
			if (err < 0) {
				retval = err;
				goto ret;
			}

 skip_it:
			h = NLMSG_NEXT(h, status);
		}
		if (msg.msg_flags & MSG_TRUNC) {
			bb_error_msg("message truncated");
			continue;
		}
		if (status) {
			bb_error_msg_and_die("remnant of size %d!", status);
		}
	} /* while (1) */
 ret_0:
	retval++; /* = 0 */
 ret:
	free(buf);
	return retval;
}

int FAST_FUNC xrtnl_dump_filter(struct rtnl_handle *rth,
		int (*filter)(const struct sockaddr_nl *, struct nlmsghdr *, void *) FAST_FUNC,
		void *arg1)
{
	int ret = rtnl_dump_filter(rth, filter, arg1/*, NULL, NULL*/);
	if (ret < 0)
		bb_error_msg_and_die("dump terminated");
	return ret;
}

int FAST_FUNC rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
		pid_t peer, unsigned groups,
		struct nlmsghdr *answer,
		int (*junk)(struct sockaddr_nl *, struct nlmsghdr *, void *),
		void *jarg)
{
/* bbox doesn't use parameters no. 3, 4, 6, 7, they are stubbed out */
#define peer   0
#define groups 0
#define junk   NULL
#define jarg   NULL
	int retval = -1;
	int status;
	unsigned seq;
	struct nlmsghdr *h;
	struct sockaddr_nl nladdr;
	struct iovec iov = { (void*)n, n->nlmsg_len };
	char   *buf = xmalloc(8*1024); /* avoid big stack buffer */
	struct msghdr msg = {
		(void*)&nladdr, sizeof(nladdr),
		&iov,	1,
		NULL,	0,
		0
	};

	memset(&nladdr, 0, sizeof(nladdr));
	nladdr.nl_family = AF_NETLINK;
//	nladdr.nl_pid = peer;
//	nladdr.nl_groups = groups;

	n->nlmsg_seq = seq = ++rtnl->seq;
	if (answer == NULL) {
		n->nlmsg_flags |= NLM_F_ACK;
	}
	status = sendmsg(rtnl->fd, &msg, 0);

	if (status < 0) {
		bb_perror_msg("can't talk to rtnetlink");
		goto ret;
	}

	iov.iov_base = buf;

	while (1) {
		iov.iov_len = 8*1024;
		status = recvmsg(rtnl->fd, &msg, 0);

		if (status < 0) {
			if (errno == EINTR) {
				continue;
			}
			bb_perror_msg("OVERRUN");
			continue;
		}
		if (status == 0) {
			bb_error_msg("EOF on netlink");
			goto ret;
		}
		if (msg.msg_namelen != sizeof(nladdr)) {
			bb_error_msg_and_die("sender address length == %d", msg.msg_namelen);
		}
		for (h = (struct nlmsghdr*)buf; status >= (int)sizeof(*h); ) {
//			int l_err;
			int len = h->nlmsg_len;
			int l = len - sizeof(*h);

			if (l < 0 || len > status) {
				if (msg.msg_flags & MSG_TRUNC) {
					bb_error_msg("truncated message");
					goto ret;
				}
				bb_error_msg_and_die("malformed message: len=%d!", len);
			}

			if (nladdr.nl_pid != peer ||
			    h->nlmsg_pid != rtnl->local.nl_pid ||
			    h->nlmsg_seq != seq) {
//				if (junk) {
//					l_err = junk(&nladdr, h, jarg);
//					if (l_err < 0) {
//						retval = l_err;
//						goto ret;
//					}
//				}
				continue;
			}

			if (h->nlmsg_type == NLMSG_ERROR) {
				struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h);
				if (l < (int)sizeof(struct nlmsgerr)) {
					bb_error_msg("ERROR truncated");
				} else {
					errno = - err->error;
					if (errno == 0) {
						if (answer) {
							memcpy(answer, h, h->nlmsg_len);
						}
						goto ret_0;
					}
					bb_perror_msg("RTNETLINK answers");
				}
				goto ret;
			}
			if (answer) {
				memcpy(answer, h, h->nlmsg_len);
				goto ret_0;
			}

			bb_error_msg("unexpected reply!");

			status -= NLMSG_ALIGN(len);
			h = (struct nlmsghdr*)((char*)h + NLMSG_ALIGN(len));
		}
		if (msg.msg_flags & MSG_TRUNC) {
			bb_error_msg("message truncated");
			continue;
		}
		if (status) {
			bb_error_msg_and_die("remnant of size %d!", status);
		}
	} /* while (1) */
 ret_0:
	retval++; /* = 0 */
 ret:
	free(buf);
	return retval;
}

int FAST_FUNC addattr32(struct nlmsghdr *n, int maxlen, int type, uint32_t data)
{
	int len = RTA_LENGTH(4);
	struct rtattr *rta;
	if ((int)(NLMSG_ALIGN(n->nlmsg_len) + len) > maxlen)
		return -1;
	rta = (struct rtattr*)(((char*)n) + NLMSG_ALIGN(n->nlmsg_len));
	rta->rta_type = type;
	rta->rta_len = len;
	move_to_unaligned32(RTA_DATA(rta), data);
	n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len;
	return 0;
}

int FAST_FUNC addattr_l(struct nlmsghdr *n, int maxlen, int type, void *data, int alen)
{
	int len = RTA_LENGTH(alen);
	struct rtattr *rta;

	if ((int)(NLMSG_ALIGN(n->nlmsg_len) + len) > maxlen)
		return -1;
	rta = (struct rtattr*)(((char*)n) + NLMSG_ALIGN(n->nlmsg_len));
	rta->rta_type = type;
	rta->rta_len = len;
	memcpy(RTA_DATA(rta), data, alen);
	n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len;
	return 0;
}

int FAST_FUNC rta_addattr32(struct rtattr *rta, int maxlen, int type, uint32_t data)
{
	int len = RTA_LENGTH(4);
	struct rtattr *subrta;

	if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
		return -1;
	}
	subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len));
	subrta->rta_type = type;
	subrta->rta_len = len;
	move_to_unaligned32(RTA_DATA(subrta), data);
	rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len;
	return 0;
}

int FAST_FUNC rta_addattr_l(struct rtattr *rta, int maxlen, int type, void *data, int alen)
{
	struct rtattr *subrta;
	int len = RTA_LENGTH(alen);

	if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
		return -1;
	}
	subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len));
	subrta->rta_type = type;
	subrta->rta_len = len;
	memcpy(RTA_DATA(subrta), data, alen);
	rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len;
	return 0;
}


int FAST_FUNC parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len)
{
	while (RTA_OK(rta, len)) {
		if (rta->rta_type <= max) {
			tb[rta->rta_type] = rta;
		}
		rta = RTA_NEXT(rta,len);
	}
	if (len) {
		bb_error_msg("deficit %d, rta_len=%d!", len, rta->rta_len);
	}
	return 0;
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* libnetlink.c RTnetlink service routines.
4	*
5	* This program is free software; you can redistribute it and/or
6	* modify it under the terms of the GNU General Public License
7	* as published by the Free Software Foundation; either version
8	* 2 of the License, or (at your option) any later version.
9	*
10	* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
11	*
12	*/
13
14	#include <sys/socket.h>
15	#include <sys/uio.h>
16
17	#include "libbb.h"
18	#include "libnetlink.h"
19
20	void FAST_FUNC rtnl_close(struct rtnl_handle *rth)
21	{
22	close(rth->fd);
23	}
24
25	int FAST_FUNC xrtnl_open(struct rtnl_handle rth/, unsigned subscriptions*/)
26	{
27	socklen_t addr_len;
28
29	memset(rth, 0, sizeof(*rth));
30	rth->fd = xsocket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
31	rth->local.nl_family = AF_NETLINK;
32	/rth->local.nl_groups = subscriptions;/
33
34	xbind(rth->fd, (struct sockaddr*)&rth->local, sizeof(rth->local));
35	addr_len = sizeof(rth->local);
36	getsockname(rth->fd, (struct sockaddr*)&rth->local, &addr_len);
37
38	/* too much paranoia
39	if (getsockname(rth->fd, (struct sockaddr*)&rth->local, &addr_len) < 0)
40	bb_perror_msg_and_die("getsockname");
41	if (addr_len != sizeof(rth->local))
42	bb_error_msg_and_die("wrong address length %d", addr_len);
43	if (rth->local.nl_family != AF_NETLINK)
44	bb_error_msg_and_die("wrong address family %d", rth->local.nl_family);
45	*/
46	rth->seq = time(NULL);
47	return 0;
48	}
49
50	int FAST_FUNC xrtnl_wilddump_request(struct rtnl_handle *rth, int family, int type)
51	{
52	struct {
53	struct nlmsghdr nlh;
54	struct rtgenmsg g;
55	} req;
56	struct sockaddr_nl nladdr;
57
58	memset(&nladdr, 0, sizeof(nladdr));
59	nladdr.nl_family = AF_NETLINK;
60
61	req.nlh.nlmsg_len = sizeof(req);
62	req.nlh.nlmsg_type = type;
63	req.nlh.nlmsg_flags = NLM_F_ROOT\|NLM_F_MATCH\|NLM_F_REQUEST;
64	req.nlh.nlmsg_pid = 0;
65	req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
66	req.g.rtgen_family = family;
67
68	return xsendto(rth->fd, (void*)&req, sizeof(req),
69	(struct sockaddr*)&nladdr, sizeof(nladdr));
70	}
71
72	int FAST_FUNC rtnl_send(struct rtnl_handle rth, char buf, int len)
73	{
74	struct sockaddr_nl nladdr;
75
76	memset(&nladdr, 0, sizeof(nladdr));
77	nladdr.nl_family = AF_NETLINK;
78
79	return xsendto(rth->fd, buf, len, (struct sockaddr*)&nladdr, sizeof(nladdr));
80	}
81
82	int FAST_FUNC rtnl_dump_request(struct rtnl_handle rth, int type, void req, int len)
83	{
84	struct nlmsghdr nlh;
85	struct sockaddr_nl nladdr;
86	struct iovec iov[2] = { { &nlh, sizeof(nlh) }, { req, len } };
87	struct msghdr msg = {
88	(void*)&nladdr, sizeof(nladdr),
89	iov, 2,
90	NULL, 0,
91	0
92	};
93
94	memset(&nladdr, 0, sizeof(nladdr));
95	nladdr.nl_family = AF_NETLINK;
96
97	nlh.nlmsg_len = NLMSG_LENGTH(len);
98	nlh.nlmsg_type = type;
99	nlh.nlmsg_flags = NLM_F_ROOT\|NLM_F_MATCH\|NLM_F_REQUEST;
100	nlh.nlmsg_pid = 0;
101	nlh.nlmsg_seq = rth->dump = ++rth->seq;
102
103	return sendmsg(rth->fd, &msg, 0);
104	}
105
106	static int rtnl_dump_filter(struct rtnl_handle *rth,
107	int (filter)(const struct sockaddr_nl , struct nlmsghdr n, void ) FAST_FUNC,
108	void arg1/,
109	int (junk)(struct sockaddr_nl , struct nlmsghdr n, void ),
110	void arg2/)
111	{
112	int retval = -1;
113	char buf = xmalloc(81024); /* avoid big stack buffer */
114	struct sockaddr_nl nladdr;
115	struct iovec iov = { buf, 8*1024 };
116
117	while (1) {
118	int status;
119	struct nlmsghdr *h;
120
121	struct msghdr msg = {
122	(void*)&nladdr, sizeof(nladdr),
123	&iov, 1,
124	NULL, 0,
125	0
126	};
127
128	status = recvmsg(rth->fd, &msg, 0);
129
130	if (status < 0) {
131	if (errno == EINTR)
132	continue;
133	bb_perror_msg("OVERRUN");
134	continue;
135	}
136	if (status == 0) {
137	bb_error_msg("EOF on netlink");
138	goto ret;
139	}
140	if (msg.msg_namelen != sizeof(nladdr)) {
141	bb_error_msg_and_die("sender address length == %d", msg.msg_namelen);
142	}
143
144	h = (struct nlmsghdr*)buf;
145	while (NLMSG_OK(h, status)) {
146	int err;
147
148	if (nladdr.nl_pid != 0 \|\|
149	h->nlmsg_pid != rth->local.nl_pid \|\|
150	h->nlmsg_seq != rth->dump) {
151	// if (junk) {
152	// err = junk(&nladdr, h, arg2);
153	// if (err < 0) {
154	// retval = err;
155	// goto ret;
156	// }
157	// }
158	goto skip_it;
159	}
160
161	if (h->nlmsg_type == NLMSG_DONE) {
162	goto ret_0;
163	}
164	if (h->nlmsg_type == NLMSG_ERROR) {
165	struct nlmsgerr l_err = (struct nlmsgerr)NLMSG_DATA(h);
166	if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) {
167	bb_error_msg("ERROR truncated");
168	} else {
169	errno = -l_err->error;
170	bb_perror_msg("RTNETLINK answers");
171	}
172	goto ret;
173	}
174	err = filter(&nladdr, h, arg1);
175	if (err < 0) {
176	retval = err;
177	goto ret;
178	}
179
180	skip_it:
181	h = NLMSG_NEXT(h, status);
182	}
183	if (msg.msg_flags & MSG_TRUNC) {
184	bb_error_msg("message truncated");
185	continue;
186	}
187	if (status) {
188	bb_error_msg_and_die("remnant of size %d!", status);
189	}
190	} /* while (1) */
191	ret_0:
192	retval++; /* = 0 */
193	ret:
194	free(buf);
195	return retval;
196	}
197
198	int FAST_FUNC xrtnl_dump_filter(struct rtnl_handle *rth,
199	int (filter)(const struct sockaddr_nl , struct nlmsghdr , void ) FAST_FUNC,
200	void *arg1)
201	{
202	int ret = rtnl_dump_filter(rth, filter, arg1/, NULL, NULL/);
203	if (ret < 0)
204	bb_error_msg_and_die("dump terminated");
205	return ret;
206	}
207
208	int FAST_FUNC rtnl_talk(struct rtnl_handle rtnl, struct nlmsghdr n,
209	pid_t peer, unsigned groups,
210	struct nlmsghdr *answer,
211	int (junk)(struct sockaddr_nl , struct nlmsghdr , void ),
212	void *jarg)
213	{
214	/* bbox doesn't use parameters no. 3, 4, 6, 7, they are stubbed out */
215	#define peer 0
216	#define groups 0
217	#define junk NULL
218	#define jarg NULL
219	int retval = -1;
220	int status;
221	unsigned seq;
222	struct nlmsghdr *h;
223	struct sockaddr_nl nladdr;
224	struct iovec iov = { (void*)n, n->nlmsg_len };
225	char buf = xmalloc(81024); /* avoid big stack buffer */
226	struct msghdr msg = {
227	(void*)&nladdr, sizeof(nladdr),
228	&iov, 1,
229	NULL, 0,
230	0
231	};
232
233	memset(&nladdr, 0, sizeof(nladdr));
234	nladdr.nl_family = AF_NETLINK;
235	// nladdr.nl_pid = peer;
236	// nladdr.nl_groups = groups;
237
238	n->nlmsg_seq = seq = ++rtnl->seq;
239	if (answer == NULL) {
240	n->nlmsg_flags \|= NLM_F_ACK;
241	}
242	status = sendmsg(rtnl->fd, &msg, 0);
243
244	if (status < 0) {
245	bb_perror_msg("can't talk to rtnetlink");
246	goto ret;
247	}
248
249	iov.iov_base = buf;
250
251	while (1) {
252	iov.iov_len = 8*1024;
253	status = recvmsg(rtnl->fd, &msg, 0);
254
255	if (status < 0) {
256	if (errno == EINTR) {
257	continue;
258	}
259	bb_perror_msg("OVERRUN");
260	continue;
261	}
262	if (status == 0) {
263	bb_error_msg("EOF on netlink");
264	goto ret;
265	}
266	if (msg.msg_namelen != sizeof(nladdr)) {
267	bb_error_msg_and_die("sender address length == %d", msg.msg_namelen);
268	}
269	for (h = (struct nlmsghdr)buf; status >= (int)sizeof(h); ) {
270	// int l_err;
271	int len = h->nlmsg_len;
272	int l = len - sizeof(*h);
273
274	if (l < 0 \|\| len > status) {
275	if (msg.msg_flags & MSG_TRUNC) {
276	bb_error_msg("truncated message");
277	goto ret;
278	}
279	bb_error_msg_and_die("malformed message: len=%d!", len);
280	}
281
282	if (nladdr.nl_pid != peer \|\|
283	h->nlmsg_pid != rtnl->local.nl_pid \|\|
284	h->nlmsg_seq != seq) {
285	// if (junk) {
286	// l_err = junk(&nladdr, h, jarg);
287	// if (l_err < 0) {
288	// retval = l_err;
289	// goto ret;
290	// }
291	// }
292	continue;
293	}
294
295	if (h->nlmsg_type == NLMSG_ERROR) {
296	struct nlmsgerr err = (struct nlmsgerr)NLMSG_DATA(h);
297	if (l < (int)sizeof(struct nlmsgerr)) {
298	bb_error_msg("ERROR truncated");
299	} else {
300	errno = - err->error;
301	if (errno == 0) {
302	if (answer) {
303	memcpy(answer, h, h->nlmsg_len);
304	}
305	goto ret_0;
306	}
307	bb_perror_msg("RTNETLINK answers");
308	}
309	goto ret;
310	}
311	if (answer) {
312	memcpy(answer, h, h->nlmsg_len);
313	goto ret_0;
314	}
315
316	bb_error_msg("unexpected reply!");
317
318	status -= NLMSG_ALIGN(len);
319	h = (struct nlmsghdr)((char)h + NLMSG_ALIGN(len));
320	}
321	if (msg.msg_flags & MSG_TRUNC) {
322	bb_error_msg("message truncated");
323	continue;
324	}
325	if (status) {
326	bb_error_msg_and_die("remnant of size %d!", status);
327	}
328	} /* while (1) */
329	ret_0:
330	retval++; /* = 0 */
331	ret:
332	free(buf);
333	return retval;
334	}
335
336	int FAST_FUNC addattr32(struct nlmsghdr *n, int maxlen, int type, uint32_t data)
337	{
338	int len = RTA_LENGTH(4);
339	struct rtattr *rta;
340	if ((int)(NLMSG_ALIGN(n->nlmsg_len) + len) > maxlen)
341	return -1;
342	rta = (struct rtattr)(((char)n) + NLMSG_ALIGN(n->nlmsg_len));
343	rta->rta_type = type;
344	rta->rta_len = len;
345	move_to_unaligned32(RTA_DATA(rta), data);
346	n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len;
347	return 0;
348	}
349
350	int FAST_FUNC addattr_l(struct nlmsghdr n, int maxlen, int type, void data, int alen)
351	{
352	int len = RTA_LENGTH(alen);
353	struct rtattr *rta;
354
355	if ((int)(NLMSG_ALIGN(n->nlmsg_len) + len) > maxlen)
356	return -1;
357	rta = (struct rtattr)(((char)n) + NLMSG_ALIGN(n->nlmsg_len));
358	rta->rta_type = type;
359	rta->rta_len = len;
360	memcpy(RTA_DATA(rta), data, alen);
361	n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len;
362	return 0;
363	}
364
365	int FAST_FUNC rta_addattr32(struct rtattr *rta, int maxlen, int type, uint32_t data)
366	{
367	int len = RTA_LENGTH(4);
368	struct rtattr *subrta;
369
370	if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
371	return -1;
372	}
373	subrta = (struct rtattr)(((char)rta) + RTA_ALIGN(rta->rta_len));
374	subrta->rta_type = type;
375	subrta->rta_len = len;
376	move_to_unaligned32(RTA_DATA(subrta), data);
377	rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len;
378	return 0;
379	}
380
381	int FAST_FUNC rta_addattr_l(struct rtattr rta, int maxlen, int type, void data, int alen)
382	{
383	struct rtattr *subrta;
384	int len = RTA_LENGTH(alen);
385
386	if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
387	return -1;
388	}
389	subrta = (struct rtattr)(((char)rta) + RTA_ALIGN(rta->rta_len));
390	subrta->rta_type = type;
391	subrta->rta_len = len;
392	memcpy(RTA_DATA(subrta), data, alen);
393	rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len;
394	return 0;
395	}
396
397
398	int FAST_FUNC parse_rtattr(struct rtattr tb[], int max, struct rtattr rta, int len)
399	{
400	while (RTA_OK(rta, len)) {
401	if (rta->rta_type <= max) {
402	tb[rta->rta_type] = rta;
403	}
404	rta = RTA_NEXT(rta,len);
405	}
406	if (len) {
407	bb_error_msg("deficit %d, rta_len=%d!", len, rta->rta_len);
408	}
409	return 0;
410	}