[mirror_iproute2.git] / lib / libnetlink.c

/*
 * 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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <fcntl.h>
#include <net/if_arp.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <sys/uio.h>

#include "libnetlink.h"

int rcvbuf = 1024 * 1024;

void rtnl_close(struct rtnl_handle *rth)
{
	if (rth->fd >= 0) {
		close(rth->fd);
		rth->fd = -1;
	}
}

int rtnl_open_byproto(struct rtnl_handle *rth, unsigned subscriptions,
		      int protocol)
{
	socklen_t addr_len;
	int sndbuf = 32768;

	memset(rth, 0, sizeof(*rth));

	rth->fd = socket(AF_NETLINK, SOCK_RAW, protocol);
	if (rth->fd < 0) {
		perror("Cannot open netlink socket");
		return -1;
	}

	if (setsockopt(rth->fd,SOL_SOCKET,SO_SNDBUF,&sndbuf,sizeof(sndbuf)) < 0) {
		perror("SO_SNDBUF");
		return -1;
	}

	if (setsockopt(rth->fd,SOL_SOCKET,SO_RCVBUF,&rcvbuf,sizeof(rcvbuf)) < 0) {
		perror("SO_RCVBUF");
		return -1;
	}

	memset(&rth->local, 0, sizeof(rth->local));
	rth->local.nl_family = AF_NETLINK;
	rth->local.nl_groups = subscriptions;

	if (bind(rth->fd, (struct sockaddr*)&rth->local, sizeof(rth->local)) < 0) {
		perror("Cannot bind netlink socket");
		return -1;
	}
	addr_len = sizeof(rth->local);
	if (getsockname(rth->fd, (struct sockaddr*)&rth->local, &addr_len) < 0) {
		perror("Cannot getsockname");
		return -1;
	}
	if (addr_len != sizeof(rth->local)) {
		fprintf(stderr, "Wrong address length %d\n", addr_len);
		return -1;
	}
	if (rth->local.nl_family != AF_NETLINK) {
		fprintf(stderr, "Wrong address family %d\n", rth->local.nl_family);
		return -1;
	}
	rth->seq = time(NULL);
	return 0;
}

int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions)
{
	return rtnl_open_byproto(rth, subscriptions, NETLINK_ROUTE);
}

int rtnl_wilddump_request(struct rtnl_handle *rth, int family, int type)
{
	struct {
		struct nlmsghdr nlh;
		struct rtgenmsg g;
	} req;

	memset(&req, 0, sizeof(req));
	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 send(rth->fd, (void*)&req, sizeof(req), 0);
}

int rtnl_send(struct rtnl_handle *rth, const void *buf, int len)
{
	return send(rth->fd, buf, len, 0);
}

int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int len)
{
	struct nlmsghdr *h;
	int status;
	char resp[1024];

	status = send(rth->fd, buf, len, 0);
	if (status < 0)
		return status;

	/* Check for immediate errors */
	status = recv(rth->fd, resp, sizeof(resp), MSG_DONTWAIT|MSG_PEEK);
	if (status < 0) {
		if (errno == EAGAIN)
			return 0;
		return -1;
	}

	for (h = (struct nlmsghdr *)resp; NLMSG_OK(h, status);
	     h = NLMSG_NEXT(h, status)) {
		if (h->nlmsg_type == NLMSG_ERROR) {
			struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h);
			if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
				fprintf(stderr, "ERROR truncated\n");
			else 
				errno = -err->error;
			return -1;
		}
	}

	return 0;
}

int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len)
{
	struct nlmsghdr nlh;
	struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
	struct iovec iov[2] = {
		{ .iov_base = &nlh, .iov_len = sizeof(nlh) },
		{ .iov_base = req, .iov_len = len }
	};
	struct msghdr msg = {
		.msg_name = &nladdr,
		.msg_namelen = 	sizeof(nladdr),
		.msg_iov = iov,
		.msg_iovlen = 2,
	};

	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);
}

int rtnl_dump_filter_l(struct rtnl_handle *rth,
		       const struct rtnl_dump_filter_arg *arg)
{
	struct sockaddr_nl nladdr;
	struct iovec iov;
	struct msghdr msg = {
		.msg_name = &nladdr,
		.msg_namelen = sizeof(nladdr),
		.msg_iov = &iov,
		.msg_iovlen = 1,
	};
	char buf[16384];

	iov.iov_base = buf;
	while (1) {
		int status;
		const struct rtnl_dump_filter_arg *a;
		int found_done = 0;
		int msglen = 0;

		iov.iov_len = sizeof(buf);
		status = recvmsg(rth->fd, &msg, 0);

		if (status < 0) {
			if (errno == EINTR || errno == EAGAIN)
				continue;
			fprintf(stderr, "netlink receive error %s (%d)\n",
				strerror(errno), errno);
			return -1;
		}

		if (status == 0) {
			fprintf(stderr, "EOF on netlink\n");
			return -1;
		}

		for (a = arg; a->filter; a++) {
			struct nlmsghdr *h = (struct nlmsghdr*)buf;
			msglen = status;

			while (NLMSG_OK(h, msglen)) {
				int err;

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

				if (h->nlmsg_type == NLMSG_DONE) {
					found_done = 1;
					break; /* process next filter */
				}
				if (h->nlmsg_type == NLMSG_ERROR) {
					struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h);
					if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) {
						fprintf(stderr,
							"ERROR truncated\n");
					} else {
						errno = -err->error;
						perror("RTNETLINK answers");
					}
					return -1;
				}
				err = a->filter(&nladdr, h, a->arg1);
				if (err < 0)
					return err;

skip_it:
				h = NLMSG_NEXT(h, msglen);
			}
		}

		if (found_done)
			return 0;

		if (msg.msg_flags & MSG_TRUNC) {
			fprintf(stderr, "Message truncated\n");
			continue;
		}
		if (msglen) {
			fprintf(stderr, "!!!Remnant of size %d\n", msglen);
			exit(1);
		}
	}
}

int rtnl_dump_filter(struct rtnl_handle *rth,
		     rtnl_filter_t filter,
		     void *arg1,
		     rtnl_filter_t junk,
		     void *arg2)
{
	const struct rtnl_dump_filter_arg a[2] = {
		{ .filter = filter, .arg1 = arg1, .junk = junk, .arg2 = arg2 },
		{ .filter = NULL,   .arg1 = NULL, .junk = NULL, .arg2 = NULL }
	};

	return rtnl_dump_filter_l(rth, a);
}

int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, pid_t peer,
	      unsigned groups, struct nlmsghdr *answer,
	      rtnl_filter_t junk,
	      void *jarg)
{
	int status;
	unsigned seq;
	struct nlmsghdr *h;
	struct sockaddr_nl nladdr;
	struct iovec iov = {
		.iov_base = (void*) n,
		.iov_len = n->nlmsg_len
	};
	struct msghdr msg = {
		.msg_name = &nladdr,
		.msg_namelen = sizeof(nladdr),
		.msg_iov = &iov,
		.msg_iovlen = 1,
	};
	char   buf[16384];

	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) {
		perror("Cannot talk to rtnetlink");
		return -1;
	}

	memset(buf,0,sizeof(buf));

	iov.iov_base = buf;

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

		if (status < 0) {
			if (errno == EINTR || errno == EAGAIN)
				continue;
			fprintf(stderr, "netlink receive error %s (%d)\n",
				strerror(errno), errno);
			return -1;
		}
		if (status == 0) {
			fprintf(stderr, "EOF on netlink\n");
			return -1;
		}
		if (msg.msg_namelen != sizeof(nladdr)) {
			fprintf(stderr, "sender address length == %d\n", msg.msg_namelen);
			exit(1);
		}
		for (h = (struct nlmsghdr*)buf; status >= sizeof(*h); ) {
			int err;
			int len = h->nlmsg_len;
			int l = len - sizeof(*h);

			if (l<0 || len>status) {
				if (msg.msg_flags & MSG_TRUNC) {
					fprintf(stderr, "Truncated message\n");
					return -1;
				}
				fprintf(stderr, "!!!malformed message: len=%d\n", len);
				exit(1);
			}

			if (nladdr.nl_pid != peer ||
			    h->nlmsg_pid != rtnl->local.nl_pid ||
			    h->nlmsg_seq != seq) {
				if (junk) {
					err = junk(&nladdr, h, jarg);
					if (err < 0)
						return err;
				}
				/* Don't forget to skip that message. */
				status -= NLMSG_ALIGN(len);
				h = (struct nlmsghdr*)((char*)h + NLMSG_ALIGN(len));
				continue;
			}

			if (h->nlmsg_type == NLMSG_ERROR) {
				struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h);
				if (l < sizeof(struct nlmsgerr)) {
					fprintf(stderr, "ERROR truncated\n");
				} else {
					errno = -err->error;
					if (errno == 0) {
						if (answer)
							memcpy(answer, h, h->nlmsg_len);
						return 0;
					}
					perror("RTNETLINK answers");
				}
				return -1;
			}
			if (answer) {
				memcpy(answer, h, h->nlmsg_len);
				return 0;
			}

			fprintf(stderr, "Unexpected reply!!!\n");

			status -= NLMSG_ALIGN(len);
			h = (struct nlmsghdr*)((char*)h + NLMSG_ALIGN(len));
		}
		if (msg.msg_flags & MSG_TRUNC) {
			fprintf(stderr, "Message truncated\n");
			continue;
		}
		if (status) {
			fprintf(stderr, "!!!Remnant of size %d\n", status);
			exit(1);
		}
	}
}

int rtnl_listen(struct rtnl_handle *rtnl,
		rtnl_filter_t handler,
		void *jarg)
{
	int status;
	struct nlmsghdr *h;
	struct sockaddr_nl nladdr;
	struct iovec iov;
	struct msghdr msg = {
		.msg_name = &nladdr,
		.msg_namelen = sizeof(nladdr),
		.msg_iov = &iov,
		.msg_iovlen = 1,
	};
	char   buf[8192];

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

	iov.iov_base = buf;
	while (1) {
		iov.iov_len = sizeof(buf);
		status = recvmsg(rtnl->fd, &msg, 0);

		if (status < 0) {
			if (errno == EINTR || errno == EAGAIN)
				continue;
			fprintf(stderr, "netlink receive error %s (%d)\n",
				strerror(errno), errno);
			if (errno == ENOBUFS)
				continue;
			return -1;
		}
		if (status == 0) {
			fprintf(stderr, "EOF on netlink\n");
			return -1;
		}
		if (msg.msg_namelen != sizeof(nladdr)) {
			fprintf(stderr, "Sender address length == %d\n", msg.msg_namelen);
			exit(1);
		}
		for (h = (struct nlmsghdr*)buf; status >= sizeof(*h); ) {
			int err;
			int len = h->nlmsg_len;
			int l = len - sizeof(*h);

			if (l<0 || len>status) {
				if (msg.msg_flags & MSG_TRUNC) {
					fprintf(stderr, "Truncated message\n");
					return -1;
				}
				fprintf(stderr, "!!!malformed message: len=%d\n", len);
				exit(1);
			}

			err = handler(&nladdr, h, jarg);
			if (err < 0)
				return err;

			status -= NLMSG_ALIGN(len);
			h = (struct nlmsghdr*)((char*)h + NLMSG_ALIGN(len));
		}
		if (msg.msg_flags & MSG_TRUNC) {
			fprintf(stderr, "Message truncated\n");
			continue;
		}
		if (status) {
			fprintf(stderr, "!!!Remnant of size %d\n", status);
			exit(1);
		}
	}
}

int rtnl_from_file(FILE *rtnl, rtnl_filter_t handler,
		   void *jarg)
{
	int status;
	struct sockaddr_nl nladdr;
	char   buf[8192];
	struct nlmsghdr *h = (void*)buf;

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

	while (1) {
		int err, len;
		int l;

		status = fread(&buf, 1, sizeof(*h), rtnl);

		if (status < 0) {
			if (errno == EINTR)
				continue;
			perror("rtnl_from_file: fread");
			return -1;
		}
		if (status == 0)
			return 0;

		len = h->nlmsg_len;
		l = len - sizeof(*h);

		if (l<0 || len>sizeof(buf)) {
			fprintf(stderr, "!!!malformed message: len=%d @%lu\n",
				len, ftell(rtnl));
			return -1;
		}

		status = fread(NLMSG_DATA(h), 1, NLMSG_ALIGN(l), rtnl);

		if (status < 0) {
			perror("rtnl_from_file: fread");
			return -1;
		}
		if (status < l) {
			fprintf(stderr, "rtnl-from_file: truncated message\n");
			return -1;
		}

		err = handler(&nladdr, h, jarg);
		if (err < 0)
			return err;
	}
}

int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data)
{
	int len = RTA_LENGTH(4);
	struct rtattr *rta;
	if (NLMSG_ALIGN(n->nlmsg_len) + len > maxlen) {
		fprintf(stderr,"addattr32: Error! max allowed bound %d exceeded\n",maxlen);
		return -1;
	}
	rta = NLMSG_TAIL(n);
	rta->rta_type = type;
	rta->rta_len = len;
	memcpy(RTA_DATA(rta), &data, 4);
	n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len;
	return 0;
}

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

	if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) {
		fprintf(stderr, "addattr_l ERROR: message exceeded bound of %d\n",maxlen);
		return -1;
	}
	rta = NLMSG_TAIL(n);
	rta->rta_type = type;
	rta->rta_len = len;
	memcpy(RTA_DATA(rta), data, alen);
	n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len);
	return 0;
}

int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len)
{
	if (NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len) > maxlen) {
		fprintf(stderr, "addraw_l ERROR: message exceeded bound of %d\n",maxlen);
		return -1;
	}

	memcpy(NLMSG_TAIL(n), data, len);
	memset((void *) NLMSG_TAIL(n) + len, 0, NLMSG_ALIGN(len) - len);
	n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len);
	return 0;
}

struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type)
{
	struct rtattr *nest = NLMSG_TAIL(n);

	addattr_l(n, maxlen, type, NULL, 0);
	return nest;
}

int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest)
{
	nest->rta_len = (void *)NLMSG_TAIL(n) - (void *)nest;
	return n->nlmsg_len;
}

struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type,
				   const void *data, int len)
{
	struct rtattr *start = NLMSG_TAIL(n);

	addattr_l(n, maxlen, type, data, len);
	addattr_nest(n, maxlen, type);
	return start;
}

int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *start)
{
	struct rtattr *nest = (void *)start + NLMSG_ALIGN(start->rta_len);

	start->rta_len = (void *)NLMSG_TAIL(n) - (void *)start;
	addattr_nest_end(n, nest);
	return n->nlmsg_len;
}

int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data)
{
	int len = RTA_LENGTH(4);
	struct rtattr *subrta;

	if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
		fprintf(stderr,"rta_addattr32: Error! max allowed bound %d exceeded\n",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, 4);
	rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len;
	return 0;
}

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

	if (RTA_ALIGN(rta->rta_len) + RTA_ALIGN(len) > maxlen) {
		fprintf(stderr,"rta_addattr_l: Error! max allowed bound %d exceeded\n",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) + RTA_ALIGN(len);
	return 0;
}

int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len)
{
	memset(tb, 0, sizeof(struct rtattr *) * (max + 1));
	while (RTA_OK(rta, len)) {
		if ((rta->rta_type <= max) && (!tb[rta->rta_type]))
			tb[rta->rta_type] = rta;
		rta = RTA_NEXT(rta,len);
	}
	if (len)
		fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", len, rta->rta_len);
	return 0;
}

int parse_rtattr_byindex(struct rtattr *tb[], int max, struct rtattr *rta, int len)
{
	int i = 0;

	memset(tb, 0, sizeof(struct rtattr *) * max);
	while (RTA_OK(rta, len)) {
		if (rta->rta_type <= max && i < max)
			tb[i++] = rta;
		rta = RTA_NEXT(rta,len);
	}
	if (len)
		fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", len, rta->rta_len);
	return i;
}

int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rta,
			         int len)
{
	if (RTA_PAYLOAD(rta) < len)
		return -1;
	if (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr)) {
		rta = RTA_DATA(rta) + RTA_ALIGN(len);
		return parse_rtattr_nested(tb, max, rta);
	}
	memset(tb, 0, sizeof(struct rtattr *) * (max + 1));
	return 0;
}
Commit	Line	Data
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>
	15	#include <unistd.h>
	16	#include <syslog.h>
	17	#include <fcntl.h>
	18	#include <net/if_arp.h>
	19	#include <sys/socket.h>
	20	#include <netinet/in.h>
	21	#include <string.h>
	22	#include <errno.h>
	23	#include <time.h>
	24	#include <sys/uio.h>
	25
	26	#include "libnetlink.h"
	27
7f03191f PM	28	int rcvbuf = 1024 * 1024;
7f03191f PM	29
aba5acdf SH	30	void rtnl_close(struct rtnl_handle *rth)
aba5acdf SH	31	{
3bfa73ff SH	32	if (rth->fd >= 0) {
	33	close(rth->fd);
	34	rth->fd = -1;
	35	}
aba5acdf SH	36	}
aba5acdf SH	37
8ed63ab1 SH	38	int rtnl_open_byproto(struct rtnl_handle *rth, unsigned subscriptions,
8ed63ab1 SH	39	int protocol)
aba5acdf	40	{
f332d169	41	socklen_t addr_len;
007d3a3e	42	int sndbuf = 32768;
aba5acdf	43
b16621ca	44	memset(rth, 0, sizeof(*rth));
aba5acdf	45
c7699875	46	rth->fd = socket(AF_NETLINK, SOCK_RAW, protocol);
aba5acdf SH	47	if (rth->fd < 0) {
	48	perror("Cannot open netlink socket");
	49	return -1;
	50	}
	51
007d3a3e SH	52	if (setsockopt(rth->fd,SOL_SOCKET,SO_SNDBUF,&sndbuf,sizeof(sndbuf)) < 0) {
	53	perror("SO_SNDBUF");
	54	return -1;
	55	}
	56
	57	if (setsockopt(rth->fd,SOL_SOCKET,SO_RCVBUF,&rcvbuf,sizeof(rcvbuf)) < 0) {
	58	perror("SO_RCVBUF");
	59	return -1;
	60	}
	61
aba5acdf SH	62	memset(&rth->local, 0, sizeof(rth->local));
	63	rth->local.nl_family = AF_NETLINK;
	64	rth->local.nl_groups = subscriptions;
	65
	66	if (bind(rth->fd, (struct sockaddr*)&rth->local, sizeof(rth->local)) < 0) {
	67	perror("Cannot bind netlink socket");
	68	return -1;
	69	}
	70	addr_len = sizeof(rth->local);
	71	if (getsockname(rth->fd, (struct sockaddr*)&rth->local, &addr_len) < 0) {
	72	perror("Cannot getsockname");
	73	return -1;
	74	}
	75	if (addr_len != sizeof(rth->local)) {
	76	fprintf(stderr, "Wrong address length %d\n", addr_len);
	77	return -1;
	78	}
	79	if (rth->local.nl_family != AF_NETLINK) {
	80	fprintf(stderr, "Wrong address family %d\n", rth->local.nl_family);
	81	return -1;
	82	}
	83	rth->seq = time(NULL);
	84	return 0;
	85	}
	86
c7699875	87	int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions)
	88	{
	89	return rtnl_open_byproto(rth, subscriptions, NETLINK_ROUTE);
	90	}
	91
aba5acdf SH	92	int rtnl_wilddump_request(struct rtnl_handle *rth, int family, int type)
	93	{
	94	struct {
	95	struct nlmsghdr nlh;
	96	struct rtgenmsg g;
	97	} req;
aba5acdf	98
8ed63ab1	99	memset(&req, 0, sizeof(req));
aba5acdf SH	100	req.nlh.nlmsg_len = sizeof(req);
	101	req.nlh.nlmsg_type = type;
	102	req.nlh.nlmsg_flags = NLM_F_ROOT\|NLM_F_MATCH\|NLM_F_REQUEST;
	103	req.nlh.nlmsg_pid = 0;
	104	req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
	105	req.g.rtgen_family = family;
	106
f31a37f7	107	return send(rth->fd, (void*)&req, sizeof(req), 0);
aba5acdf SH	108	}
aba5acdf SH	109
6cf8398f	110	int rtnl_send(struct rtnl_handle rth, const void buf, int len)
aba5acdf	111	{
f31a37f7 SH	112	return send(rth->fd, buf, len, 0);
	113	}
	114
6cf8398f	115	int rtnl_send_check(struct rtnl_handle rth, const void buf, int len)
f31a37f7	116	{
54bb35c6 SH	117	struct nlmsghdr *h;
	118	int status;
	119	char resp[1024];
aba5acdf	120
f31a37f7	121	status = send(rth->fd, buf, len, 0);
54bb35c6 SH	122	if (status < 0)
	123	return status;
	124
2d8240f8 SH	125	/* Check for immediate errors */
2d8240f8 SH	126	status = recv(rth->fd, resp, sizeof(resp), MSG_DONTWAIT\|MSG_PEEK);
54bb35c6 SH	127	if (status < 0) {
	128	if (errno == EAGAIN)
	129	return 0;
	130	return -1;
	131	}
	132
	133	for (h = (struct nlmsghdr *)resp; NLMSG_OK(h, status);
	134	h = NLMSG_NEXT(h, status)) {
	135	if (h->nlmsg_type == NLMSG_ERROR) {
	136	struct nlmsgerr err = (struct nlmsgerr)NLMSG_DATA(h);
	137	if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
	138	fprintf(stderr, "ERROR truncated\n");
	139	else
	140	errno = -err->error;
24f38182	141	return -1;
54bb35c6	142	}
54bb35c6 SH	143	}
	144
	145	return 0;
aba5acdf SH	146	}
	147
	148	int rtnl_dump_request(struct rtnl_handle rth, int type, void req, int len)
	149	{
	150	struct nlmsghdr nlh;
6cf8398f	151	struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
8ed63ab1 SH	152	struct iovec iov[2] = {
	153	{ .iov_base = &nlh, .iov_len = sizeof(nlh) },
	154	{ .iov_base = req, .iov_len = len }
	155	};
aba5acdf	156	struct msghdr msg = {
8ed63ab1 SH	157	.msg_name = &nladdr,
	158	.msg_namelen = sizeof(nladdr),
	159	.msg_iov = iov,
	160	.msg_iovlen = 2,
aba5acdf SH	161	};
aba5acdf SH	162
aba5acdf SH	163	nlh.nlmsg_len = NLMSG_LENGTH(len);
	164	nlh.nlmsg_type = type;
	165	nlh.nlmsg_flags = NLM_F_ROOT\|NLM_F_MATCH\|NLM_F_REQUEST;
	166	nlh.nlmsg_pid = 0;
	167	nlh.nlmsg_seq = rth->dump = ++rth->seq;
	168
	169	return sendmsg(rth->fd, &msg, 0);
	170	}
	171
b49240ec SH	172	int rtnl_dump_filter_l(struct rtnl_handle *rth,
b49240ec SH	173	const struct rtnl_dump_filter_arg *arg)
aba5acdf	174	{
aba5acdf	175	struct sockaddr_nl nladdr;
8ed63ab1 SH	176	struct iovec iov;
	177	struct msghdr msg = {
	178	.msg_name = &nladdr,
	179	.msg_namelen = sizeof(nladdr),
	180	.msg_iov = &iov,
	181	.msg_iovlen = 1,
	182	};
	183	char buf[16384];
aba5acdf	184
8ed63ab1	185	iov.iov_base = buf;
aba5acdf SH	186	while (1) {
aba5acdf SH	187	int status;
b49240ec	188	const struct rtnl_dump_filter_arg *a;
3bc1c4f2 BG	189	int found_done = 0;
3bc1c4f2 BG	190	int msglen = 0;
aba5acdf	191
8ed63ab1	192	iov.iov_len = sizeof(buf);
aba5acdf SH	193	status = recvmsg(rth->fd, &msg, 0);
	194
	195	if (status < 0) {
aa8032e6	196	if (errno == EINTR \|\| errno == EAGAIN)
aba5acdf	197	continue;
aa8032e6 SH	198	fprintf(stderr, "netlink receive error %s (%d)\n",
	199	strerror(errno), errno);
	200	return -1;
aba5acdf	201	}
8ed63ab1	202
aba5acdf SH	203	if (status == 0) {
	204	fprintf(stderr, "EOF on netlink\n");
	205	return -1;
	206	}
aba5acdf	207
b49240ec SH	208	for (a = arg; a->filter; a++) {
b49240ec SH	209	struct nlmsghdr h = (struct nlmsghdr)buf;
3bc1c4f2	210	msglen = status;
b49240ec	211
3bc1c4f2	212	while (NLMSG_OK(h, msglen)) {
b49240ec SH	213	int err;
	214
	215	if (nladdr.nl_pid != 0 \|\|
	216	h->nlmsg_pid != rth->local.nl_pid \|\|
	217	h->nlmsg_seq != rth->dump) {
	218	if (a->junk) {
	219	err = a->junk(&nladdr, h,
	220	a->arg2);
	221	if (err < 0)
	222	return err;
	223	}
	224	goto skip_it;
aba5acdf	225	}
aba5acdf	226
3bc1c4f2 BG	227	if (h->nlmsg_type == NLMSG_DONE) {
	228	found_done = 1;
	229	break; /* process next filter */
	230	}
b49240ec SH	231	if (h->nlmsg_type == NLMSG_ERROR) {
	232	struct nlmsgerr err = (struct nlmsgerr)NLMSG_DATA(h);
	233	if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) {
	234	fprintf(stderr,
	235	"ERROR truncated\n");
	236	} else {
	237	errno = -err->error;
	238	perror("RTNETLINK answers");
	239	}
	240	return -1;
aba5acdf	241	}
b49240ec SH	242	err = a->filter(&nladdr, h, a->arg1);
	243	if (err < 0)
	244	return err;
aba5acdf SH	245
aba5acdf SH	246	skip_it:
3bc1c4f2	247	h = NLMSG_NEXT(h, msglen);
b49240ec	248	}
3bc1c4f2 BG	249	}
	250
	251	if (found_done)
	252	return 0;
	253
aba5acdf SH	254	if (msg.msg_flags & MSG_TRUNC) {
	255	fprintf(stderr, "Message truncated\n");
	256	continue;
	257	}
3bc1c4f2 BG	258	if (msglen) {
3bc1c4f2 BG	259	fprintf(stderr, "!!!Remnant of size %d\n", msglen);
aba5acdf SH	260	exit(1);
	261	}
	262	}
	263	}
	264
b49240ec SH	265	int rtnl_dump_filter(struct rtnl_handle *rth,
	266	rtnl_filter_t filter,
	267	void *arg1,
	268	rtnl_filter_t junk,
	269	void *arg2)
	270	{
	271	const struct rtnl_dump_filter_arg a[2] = {
	272	{ .filter = filter, .arg1 = arg1, .junk = junk, .arg2 = arg2 },
	273	{ .filter = NULL, .arg1 = NULL, .junk = NULL, .arg2 = NULL }
	274	};
	275
	276	return rtnl_dump_filter_l(rth, a);
	277	}
	278
aba5acdf SH	279	int rtnl_talk(struct rtnl_handle rtnl, struct nlmsghdr n, pid_t peer,
aba5acdf SH	280	unsigned groups, struct nlmsghdr *answer,
6dc9f016	281	rtnl_filter_t junk,
aba5acdf SH	282	void *jarg)
	283	{
	284	int status;
	285	unsigned seq;
	286	struct nlmsghdr *h;
	287	struct sockaddr_nl nladdr;
fb229759 SH	288	struct iovec iov = {
	289	.iov_base = (void*) n,
	290	.iov_len = n->nlmsg_len
	291	};
aba5acdf	292	struct msghdr msg = {
8ed63ab1 SH	293	.msg_name = &nladdr,
	294	.msg_namelen = sizeof(nladdr),
	295	.msg_iov = &iov,
	296	.msg_iovlen = 1,
aba5acdf	297	};
8ed63ab1	298	char buf[16384];
aba5acdf SH	299
	300	memset(&nladdr, 0, sizeof(nladdr));
	301	nladdr.nl_family = AF_NETLINK;
	302	nladdr.nl_pid = peer;
	303	nladdr.nl_groups = groups;
	304
	305	n->nlmsg_seq = seq = ++rtnl->seq;
007d3a3e	306
aba5acdf SH	307	if (answer == NULL)
	308	n->nlmsg_flags \|= NLM_F_ACK;
	309
	310	status = sendmsg(rtnl->fd, &msg, 0);
	311
	312	if (status < 0) {
	313	perror("Cannot talk to rtnetlink");
	314	return -1;
	315	}
	316
007d3a3e SH	317	memset(buf,0,sizeof(buf));
007d3a3e SH	318
aba5acdf SH	319	iov.iov_base = buf;
	320
	321	while (1) {
	322	iov.iov_len = sizeof(buf);
	323	status = recvmsg(rtnl->fd, &msg, 0);
	324
	325	if (status < 0) {
aa8032e6	326	if (errno == EINTR \|\| errno == EAGAIN)
aba5acdf	327	continue;
aa8032e6 SH	328	fprintf(stderr, "netlink receive error %s (%d)\n",
	329	strerror(errno), errno);
	330	return -1;
aba5acdf SH	331	}
	332	if (status == 0) {
	333	fprintf(stderr, "EOF on netlink\n");
	334	return -1;
	335	}
	336	if (msg.msg_namelen != sizeof(nladdr)) {
	337	fprintf(stderr, "sender address length == %d\n", msg.msg_namelen);
	338	exit(1);
	339	}
	340	for (h = (struct nlmsghdr)buf; status >= sizeof(h); ) {
	341	int err;
	342	int len = h->nlmsg_len;
	343	int l = len - sizeof(*h);
	344
	345	if (l<0 \|\| len>status) {
	346	if (msg.msg_flags & MSG_TRUNC) {
	347	fprintf(stderr, "Truncated message\n");
	348	return -1;
	349	}
	350	fprintf(stderr, "!!!malformed message: len=%d\n", len);
	351	exit(1);
	352	}
	353
10f57ef1	354	if (nladdr.nl_pid != peer \|\|
10f57ef1	355	h->nlmsg_pid != rtnl->local.nl_pid \|\|
aba5acdf SH	356	h->nlmsg_seq != seq) {
	357	if (junk) {
	358	err = junk(&nladdr, h, jarg);
	359	if (err < 0)
	360	return err;
	361	}
4cca16f2 SH	362	/* Don't forget to skip that message. */
	363	status -= NLMSG_ALIGN(len);
	364	h = (struct nlmsghdr)((char)h + NLMSG_ALIGN(len));
aba5acdf SH	365	continue;
	366	}
	367
	368	if (h->nlmsg_type == NLMSG_ERROR) {
	369	struct nlmsgerr err = (struct nlmsgerr)NLMSG_DATA(h);
	370	if (l < sizeof(struct nlmsgerr)) {
	371	fprintf(stderr, "ERROR truncated\n");
	372	} else {
	373	errno = -err->error;
	374	if (errno == 0) {
	375	if (answer)
	376	memcpy(answer, h, h->nlmsg_len);
	377	return 0;
	378	}
	379	perror("RTNETLINK answers");
	380	}
	381	return -1;
	382	}
	383	if (answer) {
	384	memcpy(answer, h, h->nlmsg_len);
	385	return 0;
	386	}
	387
	388	fprintf(stderr, "Unexpected reply!!!\n");
	389
	390	status -= NLMSG_ALIGN(len);
	391	h = (struct nlmsghdr)((char)h + NLMSG_ALIGN(len));
	392	}
	393	if (msg.msg_flags & MSG_TRUNC) {
	394	fprintf(stderr, "Message truncated\n");
	395	continue;
	396	}
	397	if (status) {
	398	fprintf(stderr, "!!!Remnant of size %d\n", status);
	399	exit(1);
	400	}
	401	}
	402	}
	403
8ed63ab1	404	int rtnl_listen(struct rtnl_handle *rtnl,
6dc9f016 SH	405	rtnl_filter_t handler,
6dc9f016 SH	406	void *jarg)
aba5acdf SH	407	{
	408	int status;
	409	struct nlmsghdr *h;
	410	struct sockaddr_nl nladdr;
	411	struct iovec iov;
aba5acdf	412	struct msghdr msg = {
8ed63ab1 SH	413	.msg_name = &nladdr,
	414	.msg_namelen = sizeof(nladdr),
	415	.msg_iov = &iov,
	416	.msg_iovlen = 1,
aba5acdf	417	};
8ed63ab1	418	char buf[8192];
aba5acdf SH	419
	420	memset(&nladdr, 0, sizeof(nladdr));
	421	nladdr.nl_family = AF_NETLINK;
	422	nladdr.nl_pid = 0;
	423	nladdr.nl_groups = 0;
	424
aba5acdf	425	iov.iov_base = buf;
aba5acdf SH	426	while (1) {
	427	iov.iov_len = sizeof(buf);
	428	status = recvmsg(rtnl->fd, &msg, 0);
	429
	430	if (status < 0) {
aa8032e6	431	if (errno == EINTR \|\| errno == EAGAIN)
aba5acdf	432	continue;
aa8032e6 SH	433	fprintf(stderr, "netlink receive error %s (%d)\n",
aa8032e6 SH	434	strerror(errno), errno);
7f03191f PM	435	if (errno == ENOBUFS)
7f03191f PM	436	continue;
aa8032e6	437	return -1;
aba5acdf SH	438	}
	439	if (status == 0) {
	440	fprintf(stderr, "EOF on netlink\n");
	441	return -1;
	442	}
	443	if (msg.msg_namelen != sizeof(nladdr)) {
	444	fprintf(stderr, "Sender address length == %d\n", msg.msg_namelen);
	445	exit(1);
	446	}
	447	for (h = (struct nlmsghdr)buf; status >= sizeof(h); ) {
	448	int err;
	449	int len = h->nlmsg_len;
	450	int l = len - sizeof(*h);
	451
	452	if (l<0 \|\| len>status) {
	453	if (msg.msg_flags & MSG_TRUNC) {
	454	fprintf(stderr, "Truncated message\n");
	455	return -1;
	456	}
	457	fprintf(stderr, "!!!malformed message: len=%d\n", len);
	458	exit(1);
	459	}
	460
	461	err = handler(&nladdr, h, jarg);
	462	if (err < 0)
	463	return err;
	464
	465	status -= NLMSG_ALIGN(len);
	466	h = (struct nlmsghdr)((char)h + NLMSG_ALIGN(len));
	467	}
	468	if (msg.msg_flags & MSG_TRUNC) {
	469	fprintf(stderr, "Message truncated\n");
	470	continue;
	471	}
	472	if (status) {
	473	fprintf(stderr, "!!!Remnant of size %d\n", status);
	474	exit(1);
	475	}
	476	}
	477	}
	478
6dc9f016 SH	479	int rtnl_from_file(FILE *rtnl, rtnl_filter_t handler,
6dc9f016 SH	480	void *jarg)
aba5acdf SH	481	{
	482	int status;
	483	struct sockaddr_nl nladdr;
	484	char buf[8192];
	485	struct nlmsghdr h = (void)buf;
	486
	487	memset(&nladdr, 0, sizeof(nladdr));
	488	nladdr.nl_family = AF_NETLINK;
	489	nladdr.nl_pid = 0;
	490	nladdr.nl_groups = 0;
	491
	492	while (1) {
2dd9f8e0	493	int err, len;
aba5acdf SH	494	int l;
	495
	496	status = fread(&buf, 1, sizeof(*h), rtnl);
	497
	498	if (status < 0) {
	499	if (errno == EINTR)
	500	continue;
	501	perror("rtnl_from_file: fread");
	502	return -1;
	503	}
	504	if (status == 0)
	505	return 0;
	506
	507	len = h->nlmsg_len;
aba5acdf SH	508	l = len - sizeof(*h);
	509
	510	if (l<0 \|\| len>sizeof(buf)) {
	511	fprintf(stderr, "!!!malformed message: len=%d @%lu\n",
	512	len, ftell(rtnl));
	513	return -1;
	514	}
	515
	516	status = fread(NLMSG_DATA(h), 1, NLMSG_ALIGN(l), rtnl);
	517
	518	if (status < 0) {
	519	perror("rtnl_from_file: fread");
	520	return -1;
	521	}
	522	if (status < l) {
	523	fprintf(stderr, "rtnl-from_file: truncated message\n");
	524	return -1;
	525	}
	526
	527	err = handler(&nladdr, h, jarg);
	528	if (err < 0)
	529	return err;
	530	}
	531	}
	532
	533	int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data)
	534	{
	535	int len = RTA_LENGTH(4);
	536	struct rtattr *rta;
007d3a3e SH	537	if (NLMSG_ALIGN(n->nlmsg_len) + len > maxlen) {
007d3a3e SH	538	fprintf(stderr,"addattr32: Error! max allowed bound %d exceeded\n",maxlen);
aba5acdf	539	return -1;
007d3a3e	540	}
07f94362	541	rta = NLMSG_TAIL(n);
aba5acdf SH	542	rta->rta_type = type;
	543	rta->rta_len = len;
	544	memcpy(RTA_DATA(rta), &data, 4);
	545	n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len;
	546	return 0;
	547	}
	548
8ed63ab1	549	int addattr_l(struct nlmsghdr n, int maxlen, int type, const void data,
6dc9f016	550	int alen)
aba5acdf SH	551	{
	552	int len = RTA_LENGTH(alen);
	553	struct rtattr *rta;
	554
3dabdbb3	555	if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) {
007d3a3e	556	fprintf(stderr, "addattr_l ERROR: message exceeded bound of %d\n",maxlen);
aba5acdf	557	return -1;
007d3a3e	558	}
07f94362	559	rta = NLMSG_TAIL(n);
aba5acdf SH	560	rta->rta_type = type;
	561	rta->rta_len = len;
	562	memcpy(RTA_DATA(rta), data, alen);
3dabdbb3	563	n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len);
aba5acdf SH	564	return 0;
	565	}
	566
07f94362	567	int addraw_l(struct nlmsghdr n, int maxlen, const void data, int len)
	568	{
	569	if (NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len) > maxlen) {
	570	fprintf(stderr, "addraw_l ERROR: message exceeded bound of %d\n",maxlen);
	571	return -1;
	572	}
	573
	574	memcpy(NLMSG_TAIL(n), data, len);
	575	memset((void *) NLMSG_TAIL(n) + len, 0, NLMSG_ALIGN(len) - len);
	576	n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len);
	577	return 0;
	578	}
	579
2f90c9c0 PM	580	struct rtattr addattr_nest(struct nlmsghdr n, int maxlen, int type)
	581	{
	582	struct rtattr *nest = NLMSG_TAIL(n);
	583
	584	addattr_l(n, maxlen, type, NULL, 0);
	585	return nest;
	586	}
	587
	588	int addattr_nest_end(struct nlmsghdr n, struct rtattr nest)
	589	{
	590	nest->rta_len = (void )NLMSG_TAIL(n) - (void )nest;
	591	return n->nlmsg_len;
	592	}
	593
	594	struct rtattr addattr_nest_compat(struct nlmsghdr n, int maxlen, int type,
	595	const void *data, int len)
	596	{
	597	struct rtattr *start = NLMSG_TAIL(n);
	598
	599	addattr_l(n, maxlen, type, data, len);
	600	addattr_nest(n, maxlen, type);
	601	return start;
	602	}
	603
	604	int addattr_nest_compat_end(struct nlmsghdr n, struct rtattr start)
	605	{
	606	struct rtattr nest = (void )start + NLMSG_ALIGN(start->rta_len);
	607
	608	start->rta_len = (void )NLMSG_TAIL(n) - (void )start;
	609	addattr_nest_end(n, nest);
	610	return n->nlmsg_len;
	611	}
	612
aba5acdf SH	613	int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data)
	614	{
	615	int len = RTA_LENGTH(4);
	616	struct rtattr *subrta;
	617
007d3a3e SH	618	if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
007d3a3e SH	619	fprintf(stderr,"rta_addattr32: Error! max allowed bound %d exceeded\n",maxlen);
aba5acdf	620	return -1;
007d3a3e	621	}
aba5acdf SH	622	subrta = (struct rtattr)(((char)rta) + RTA_ALIGN(rta->rta_len));
	623	subrta->rta_type = type;
	624	subrta->rta_len = len;
	625	memcpy(RTA_DATA(subrta), &data, 4);
	626	rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len;
	627	return 0;
	628	}
	629
8ed63ab1	630	int rta_addattr_l(struct rtattr *rta, int maxlen, int type,
6dc9f016	631	const void *data, int alen)
aba5acdf SH	632	{
	633	struct rtattr *subrta;
	634	int len = RTA_LENGTH(alen);
	635
3dabdbb3	636	if (RTA_ALIGN(rta->rta_len) + RTA_ALIGN(len) > maxlen) {
007d3a3e	637	fprintf(stderr,"rta_addattr_l: Error! max allowed bound %d exceeded\n",maxlen);
aba5acdf	638	return -1;
007d3a3e	639	}
aba5acdf SH	640	subrta = (struct rtattr)(((char)rta) + RTA_ALIGN(rta->rta_len));
	641	subrta->rta_type = type;
	642	subrta->rta_len = len;
	643	memcpy(RTA_DATA(subrta), data, alen);
3dabdbb3	644	rta->rta_len = NLMSG_ALIGN(rta->rta_len) + RTA_ALIGN(len);
aba5acdf SH	645	return 0;
	646	}
	647
aba5acdf SH	648	int parse_rtattr(struct rtattr tb[], int max, struct rtattr rta, int len)
aba5acdf SH	649	{
175e2440	650	memset(tb, 0, sizeof(struct rtattr ) (max + 1));
aba5acdf	651	while (RTA_OK(rta, len)) {
6e46ec81	652	if ((rta->rta_type <= max) && (!tb[rta->rta_type]))
aba5acdf SH	653	tb[rta->rta_type] = rta;
	654	rta = RTA_NEXT(rta,len);
	655	}
	656	if (len)
	657	fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", len, rta->rta_len);
	658	return 0;
	659	}
c7699875	660
	661	int parse_rtattr_byindex(struct rtattr tb[], int max, struct rtattr rta, int len)
	662	{
	663	int i = 0;
175e2440 SH	664
175e2440 SH	665	memset(tb, 0, sizeof(struct rtattr ) max);
c7699875	666	while (RTA_OK(rta, len)) {
175e2440	667	if (rta->rta_type <= max && i < max)
c7699875	668	tb[i++] = rta;
	669	rta = RTA_NEXT(rta,len);
	670	}
	671	if (len)
	672	fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", len, rta->rta_len);
	673	return i;
	674	}
2f90c9c0 PM	675
	676	int __parse_rtattr_nested_compat(struct rtattr tb[], int max, struct rtattr rta,
	677	int len)
	678	{
	679	if (RTA_PAYLOAD(rta) < len)
	680	return -1;
	681	if (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr)) {
	682	rta = RTA_DATA(rta) + RTA_ALIGN(len);
	683	return parse_rtattr_nested(tb, max, rta);
	684	}
037c635e	685	memset(tb, 0, sizeof(struct rtattr ) (max + 1));
2f90c9c0 PM	686	return 0;
2f90c9c0 PM	687	}