[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 char *buf, int len)
{
	return send(rth->fd, buf, len, 0);
}

int rtnl_send_check(struct rtnl_handle *rth, const char *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;
	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,
	};

	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);
}

int rtnl_dump_filter(struct rtnl_handle *rth,
		     rtnl_filter_t filter,
		     void *arg1,
		     rtnl_filter_t junk,
		     void *arg2)
{
	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;
		struct nlmsghdr *h;

		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;
		}

		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)
						return err;
				}
				goto skip_it;
			}

			if (h->nlmsg_type == NLMSG_DONE)
				return 0;
			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 = filter(&nladdr, h, arg1);
			if (err < 0)
				return err;

skip_it:
			h = NLMSG_NEXT(h, status);
		}
		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_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, type;
		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;
		type= h->nlmsg_type;
		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] = 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
6dc9f016	110	int rtnl_send(struct rtnl_handle rth, const char buf, int len)
aba5acdf	111	{
f31a37f7 SH	112	return send(rth->fd, buf, len, 0);
	113	}
	114
	115	int rtnl_send_check(struct rtnl_handle rth, const char buf, int len)
	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;
	151	struct sockaddr_nl nladdr;
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	};
	162
	163	memset(&nladdr, 0, sizeof(nladdr));
	164	nladdr.nl_family = AF_NETLINK;
	165
	166	nlh.nlmsg_len = NLMSG_LENGTH(len);
	167	nlh.nlmsg_type = type;
	168	nlh.nlmsg_flags = NLM_F_ROOT\|NLM_F_MATCH\|NLM_F_REQUEST;
	169	nlh.nlmsg_pid = 0;
	170	nlh.nlmsg_seq = rth->dump = ++rth->seq;
	171
	172	return sendmsg(rth->fd, &msg, 0);
	173	}
	174
	175	int rtnl_dump_filter(struct rtnl_handle *rth,
6dc9f016	176	rtnl_filter_t filter,
aba5acdf	177	void *arg1,
6dc9f016	178	rtnl_filter_t junk,
aba5acdf SH	179	void *arg2)
aba5acdf SH	180	{
aba5acdf	181	struct sockaddr_nl nladdr;
8ed63ab1 SH	182	struct iovec iov;
	183	struct msghdr msg = {
	184	.msg_name = &nladdr,
	185	.msg_namelen = sizeof(nladdr),
	186	.msg_iov = &iov,
	187	.msg_iovlen = 1,
	188	};
	189	char buf[16384];
aba5acdf	190
8ed63ab1	191	iov.iov_base = buf;
aba5acdf SH	192	while (1) {
	193	int status;
	194	struct nlmsghdr *h;
	195
8ed63ab1	196	iov.iov_len = sizeof(buf);
aba5acdf SH	197	status = recvmsg(rth->fd, &msg, 0);
	198
	199	if (status < 0) {
aa8032e6	200	if (errno == EINTR \|\| errno == EAGAIN)
aba5acdf	201	continue;
aa8032e6 SH	202	fprintf(stderr, "netlink receive error %s (%d)\n",
	203	strerror(errno), errno);
	204	return -1;
aba5acdf	205	}
8ed63ab1	206
aba5acdf SH	207	if (status == 0) {
	208	fprintf(stderr, "EOF on netlink\n");
	209	return -1;
	210	}
aba5acdf SH	211
	212	h = (struct nlmsghdr*)buf;
	213	while (NLMSG_OK(h, status)) {
	214	int err;
	215
10f57ef1	216	if (nladdr.nl_pid != 0 \|\|
10f57ef1	217	h->nlmsg_pid != rth->local.nl_pid \|\|
aba5acdf SH	218	h->nlmsg_seq != rth->dump) {
	219	if (junk) {
	220	err = junk(&nladdr, h, arg2);
	221	if (err < 0)
	222	return err;
	223	}
	224	goto skip_it;
	225	}
	226
	227	if (h->nlmsg_type == NLMSG_DONE)
	228	return 0;
	229	if (h->nlmsg_type == NLMSG_ERROR) {
	230	struct nlmsgerr err = (struct nlmsgerr)NLMSG_DATA(h);
	231	if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) {
	232	fprintf(stderr, "ERROR truncated\n");
	233	} else {
	234	errno = -err->error;
	235	perror("RTNETLINK answers");
	236	}
	237	return -1;
	238	}
	239	err = filter(&nladdr, h, arg1);
	240	if (err < 0)
	241	return err;
	242
	243	skip_it:
	244	h = NLMSG_NEXT(h, status);
	245	}
	246	if (msg.msg_flags & MSG_TRUNC) {
	247	fprintf(stderr, "Message truncated\n");
	248	continue;
	249	}
	250	if (status) {
	251	fprintf(stderr, "!!!Remnant of size %d\n", status);
	252	exit(1);
	253	}
	254	}
	255	}
	256
	257	int rtnl_talk(struct rtnl_handle rtnl, struct nlmsghdr n, pid_t peer,
	258	unsigned groups, struct nlmsghdr *answer,
6dc9f016	259	rtnl_filter_t junk,
aba5acdf SH	260	void *jarg)
	261	{
	262	int status;
	263	unsigned seq;
	264	struct nlmsghdr *h;
	265	struct sockaddr_nl nladdr;
fb229759 SH	266	struct iovec iov = {
	267	.iov_base = (void*) n,
	268	.iov_len = n->nlmsg_len
	269	};
aba5acdf	270	struct msghdr msg = {
8ed63ab1 SH	271	.msg_name = &nladdr,
	272	.msg_namelen = sizeof(nladdr),
	273	.msg_iov = &iov,
	274	.msg_iovlen = 1,
aba5acdf	275	};
8ed63ab1	276	char buf[16384];
aba5acdf SH	277
	278	memset(&nladdr, 0, sizeof(nladdr));
	279	nladdr.nl_family = AF_NETLINK;
	280	nladdr.nl_pid = peer;
	281	nladdr.nl_groups = groups;
	282
	283	n->nlmsg_seq = seq = ++rtnl->seq;
007d3a3e	284
aba5acdf SH	285	if (answer == NULL)
	286	n->nlmsg_flags \|= NLM_F_ACK;
	287
	288	status = sendmsg(rtnl->fd, &msg, 0);
	289
	290	if (status < 0) {
	291	perror("Cannot talk to rtnetlink");
	292	return -1;
	293	}
	294
007d3a3e SH	295	memset(buf,0,sizeof(buf));
007d3a3e SH	296
aba5acdf SH	297	iov.iov_base = buf;
	298
	299	while (1) {
	300	iov.iov_len = sizeof(buf);
	301	status = recvmsg(rtnl->fd, &msg, 0);
	302
	303	if (status < 0) {
aa8032e6	304	if (errno == EINTR \|\| errno == EAGAIN)
aba5acdf	305	continue;
aa8032e6 SH	306	fprintf(stderr, "netlink receive error %s (%d)\n",
	307	strerror(errno), errno);
	308	return -1;
aba5acdf SH	309	}
	310	if (status == 0) {
	311	fprintf(stderr, "EOF on netlink\n");
	312	return -1;
	313	}
	314	if (msg.msg_namelen != sizeof(nladdr)) {
	315	fprintf(stderr, "sender address length == %d\n", msg.msg_namelen);
	316	exit(1);
	317	}
	318	for (h = (struct nlmsghdr)buf; status >= sizeof(h); ) {
	319	int err;
	320	int len = h->nlmsg_len;
	321	int l = len - sizeof(*h);
	322
	323	if (l<0 \|\| len>status) {
	324	if (msg.msg_flags & MSG_TRUNC) {
	325	fprintf(stderr, "Truncated message\n");
	326	return -1;
	327	}
	328	fprintf(stderr, "!!!malformed message: len=%d\n", len);
	329	exit(1);
	330	}
	331
10f57ef1	332	if (nladdr.nl_pid != peer \|\|
10f57ef1	333	h->nlmsg_pid != rtnl->local.nl_pid \|\|
aba5acdf SH	334	h->nlmsg_seq != seq) {
	335	if (junk) {
	336	err = junk(&nladdr, h, jarg);
	337	if (err < 0)
	338	return err;
	339	}
4cca16f2 SH	340	/* Don't forget to skip that message. */
	341	status -= NLMSG_ALIGN(len);
	342	h = (struct nlmsghdr)((char)h + NLMSG_ALIGN(len));
aba5acdf SH	343	continue;
	344	}
	345
	346	if (h->nlmsg_type == NLMSG_ERROR) {
	347	struct nlmsgerr err = (struct nlmsgerr)NLMSG_DATA(h);
	348	if (l < sizeof(struct nlmsgerr)) {
	349	fprintf(stderr, "ERROR truncated\n");
	350	} else {
	351	errno = -err->error;
	352	if (errno == 0) {
	353	if (answer)
	354	memcpy(answer, h, h->nlmsg_len);
	355	return 0;
	356	}
	357	perror("RTNETLINK answers");
	358	}
	359	return -1;
	360	}
	361	if (answer) {
	362	memcpy(answer, h, h->nlmsg_len);
	363	return 0;
	364	}
	365
	366	fprintf(stderr, "Unexpected reply!!!\n");
	367
	368	status -= NLMSG_ALIGN(len);
	369	h = (struct nlmsghdr)((char)h + NLMSG_ALIGN(len));
	370	}
	371	if (msg.msg_flags & MSG_TRUNC) {
	372	fprintf(stderr, "Message truncated\n");
	373	continue;
	374	}
	375	if (status) {
	376	fprintf(stderr, "!!!Remnant of size %d\n", status);
	377	exit(1);
	378	}
	379	}
	380	}
	381
8ed63ab1	382	int rtnl_listen(struct rtnl_handle *rtnl,
6dc9f016 SH	383	rtnl_filter_t handler,
6dc9f016 SH	384	void *jarg)
aba5acdf SH	385	{
	386	int status;
	387	struct nlmsghdr *h;
	388	struct sockaddr_nl nladdr;
	389	struct iovec iov;
aba5acdf	390	struct msghdr msg = {
8ed63ab1 SH	391	.msg_name = &nladdr,
	392	.msg_namelen = sizeof(nladdr),
	393	.msg_iov = &iov,
	394	.msg_iovlen = 1,
aba5acdf	395	};
8ed63ab1	396	char buf[8192];
aba5acdf SH	397
	398	memset(&nladdr, 0, sizeof(nladdr));
	399	nladdr.nl_family = AF_NETLINK;
	400	nladdr.nl_pid = 0;
	401	nladdr.nl_groups = 0;
	402
aba5acdf	403	iov.iov_base = buf;
aba5acdf SH	404	while (1) {
	405	iov.iov_len = sizeof(buf);
	406	status = recvmsg(rtnl->fd, &msg, 0);
	407
	408	if (status < 0) {
aa8032e6	409	if (errno == EINTR \|\| errno == EAGAIN)
aba5acdf	410	continue;
aa8032e6 SH	411	fprintf(stderr, "netlink receive error %s (%d)\n",
aa8032e6 SH	412	strerror(errno), errno);
7f03191f PM	413	if (errno == ENOBUFS)
7f03191f PM	414	continue;
aa8032e6	415	return -1;
aba5acdf SH	416	}
	417	if (status == 0) {
	418	fprintf(stderr, "EOF on netlink\n");
	419	return -1;
	420	}
	421	if (msg.msg_namelen != sizeof(nladdr)) {
	422	fprintf(stderr, "Sender address length == %d\n", msg.msg_namelen);
	423	exit(1);
	424	}
	425	for (h = (struct nlmsghdr)buf; status >= sizeof(h); ) {
	426	int err;
	427	int len = h->nlmsg_len;
	428	int l = len - sizeof(*h);
	429
	430	if (l<0 \|\| len>status) {
	431	if (msg.msg_flags & MSG_TRUNC) {
	432	fprintf(stderr, "Truncated message\n");
	433	return -1;
	434	}
	435	fprintf(stderr, "!!!malformed message: len=%d\n", len);
	436	exit(1);
	437	}
	438
	439	err = handler(&nladdr, h, jarg);
	440	if (err < 0)
	441	return err;
	442
	443	status -= NLMSG_ALIGN(len);
	444	h = (struct nlmsghdr)((char)h + NLMSG_ALIGN(len));
	445	}
	446	if (msg.msg_flags & MSG_TRUNC) {
	447	fprintf(stderr, "Message truncated\n");
	448	continue;
	449	}
	450	if (status) {
	451	fprintf(stderr, "!!!Remnant of size %d\n", status);
	452	exit(1);
	453	}
	454	}
	455	}
	456
6dc9f016 SH	457	int rtnl_from_file(FILE *rtnl, rtnl_filter_t handler,
6dc9f016 SH	458	void *jarg)
aba5acdf SH	459	{
	460	int status;
	461	struct sockaddr_nl nladdr;
	462	char buf[8192];
	463	struct nlmsghdr h = (void)buf;
	464
	465	memset(&nladdr, 0, sizeof(nladdr));
	466	nladdr.nl_family = AF_NETLINK;
	467	nladdr.nl_pid = 0;
	468	nladdr.nl_groups = 0;
	469
	470	while (1) {
	471	int err, len, type;
	472	int l;
	473
	474	status = fread(&buf, 1, sizeof(*h), rtnl);
	475
	476	if (status < 0) {
	477	if (errno == EINTR)
	478	continue;
	479	perror("rtnl_from_file: fread");
	480	return -1;
	481	}
	482	if (status == 0)
	483	return 0;
	484
	485	len = h->nlmsg_len;
	486	type= h->nlmsg_type;
	487	l = len - sizeof(*h);
	488
	489	if (l<0 \|\| len>sizeof(buf)) {
	490	fprintf(stderr, "!!!malformed message: len=%d @%lu\n",
	491	len, ftell(rtnl));
	492	return -1;
	493	}
	494
	495	status = fread(NLMSG_DATA(h), 1, NLMSG_ALIGN(l), rtnl);
	496
	497	if (status < 0) {
	498	perror("rtnl_from_file: fread");
	499	return -1;
	500	}
	501	if (status < l) {
	502	fprintf(stderr, "rtnl-from_file: truncated message\n");
	503	return -1;
	504	}
	505
	506	err = handler(&nladdr, h, jarg);
	507	if (err < 0)
	508	return err;
	509	}
	510	}
	511
	512	int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data)
	513	{
	514	int len = RTA_LENGTH(4);
	515	struct rtattr *rta;
007d3a3e SH	516	if (NLMSG_ALIGN(n->nlmsg_len) + len > maxlen) {
007d3a3e SH	517	fprintf(stderr,"addattr32: Error! max allowed bound %d exceeded\n",maxlen);
aba5acdf	518	return -1;
007d3a3e	519	}
07f94362	520	rta = NLMSG_TAIL(n);
aba5acdf SH	521	rta->rta_type = type;
	522	rta->rta_len = len;
	523	memcpy(RTA_DATA(rta), &data, 4);
	524	n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len;
	525	return 0;
	526	}
	527
8ed63ab1	528	int addattr_l(struct nlmsghdr n, int maxlen, int type, const void data,
6dc9f016	529	int alen)
aba5acdf SH	530	{
	531	int len = RTA_LENGTH(alen);
	532	struct rtattr *rta;
	533
3dabdbb3	534	if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) {
007d3a3e	535	fprintf(stderr, "addattr_l ERROR: message exceeded bound of %d\n",maxlen);
aba5acdf	536	return -1;
007d3a3e	537	}
07f94362	538	rta = NLMSG_TAIL(n);
aba5acdf SH	539	rta->rta_type = type;
	540	rta->rta_len = len;
	541	memcpy(RTA_DATA(rta), data, alen);
3dabdbb3	542	n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len);
aba5acdf SH	543	return 0;
	544	}
	545
07f94362	546	int addraw_l(struct nlmsghdr n, int maxlen, const void data, int len)
	547	{
	548	if (NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len) > maxlen) {
	549	fprintf(stderr, "addraw_l ERROR: message exceeded bound of %d\n",maxlen);
	550	return -1;
	551	}
	552
	553	memcpy(NLMSG_TAIL(n), data, len);
	554	memset((void *) NLMSG_TAIL(n) + len, 0, NLMSG_ALIGN(len) - len);
	555	n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len);
	556	return 0;
	557	}
	558
2f90c9c0 PM	559	struct rtattr addattr_nest(struct nlmsghdr n, int maxlen, int type)
	560	{
	561	struct rtattr *nest = NLMSG_TAIL(n);
	562
	563	addattr_l(n, maxlen, type, NULL, 0);
	564	return nest;
	565	}
	566
	567	int addattr_nest_end(struct nlmsghdr n, struct rtattr nest)
	568	{
	569	nest->rta_len = (void )NLMSG_TAIL(n) - (void )nest;
	570	return n->nlmsg_len;
	571	}
	572
	573	struct rtattr addattr_nest_compat(struct nlmsghdr n, int maxlen, int type,
	574	const void *data, int len)
	575	{
	576	struct rtattr *start = NLMSG_TAIL(n);
	577
	578	addattr_l(n, maxlen, type, data, len);
	579	addattr_nest(n, maxlen, type);
	580	return start;
	581	}
	582
	583	int addattr_nest_compat_end(struct nlmsghdr n, struct rtattr start)
	584	{
	585	struct rtattr nest = (void )start + NLMSG_ALIGN(start->rta_len);
	586
	587	start->rta_len = (void )NLMSG_TAIL(n) - (void )start;
	588	addattr_nest_end(n, nest);
	589	return n->nlmsg_len;
	590	}
	591
aba5acdf SH	592	int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data)
	593	{
	594	int len = RTA_LENGTH(4);
	595	struct rtattr *subrta;
	596
007d3a3e SH	597	if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
007d3a3e SH	598	fprintf(stderr,"rta_addattr32: Error! max allowed bound %d exceeded\n",maxlen);
aba5acdf	599	return -1;
007d3a3e	600	}
aba5acdf SH	601	subrta = (struct rtattr)(((char)rta) + RTA_ALIGN(rta->rta_len));
	602	subrta->rta_type = type;
	603	subrta->rta_len = len;
	604	memcpy(RTA_DATA(subrta), &data, 4);
	605	rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len;
	606	return 0;
	607	}
	608
8ed63ab1	609	int rta_addattr_l(struct rtattr *rta, int maxlen, int type,
6dc9f016	610	const void *data, int alen)
aba5acdf SH	611	{
	612	struct rtattr *subrta;
	613	int len = RTA_LENGTH(alen);
	614
3dabdbb3	615	if (RTA_ALIGN(rta->rta_len) + RTA_ALIGN(len) > maxlen) {
007d3a3e	616	fprintf(stderr,"rta_addattr_l: Error! max allowed bound %d exceeded\n",maxlen);
aba5acdf	617	return -1;
007d3a3e	618	}
aba5acdf SH	619	subrta = (struct rtattr)(((char)rta) + RTA_ALIGN(rta->rta_len));
	620	subrta->rta_type = type;
	621	subrta->rta_len = len;
	622	memcpy(RTA_DATA(subrta), data, alen);
3dabdbb3	623	rta->rta_len = NLMSG_ALIGN(rta->rta_len) + RTA_ALIGN(len);
aba5acdf SH	624	return 0;
	625	}
	626
aba5acdf SH	627	int parse_rtattr(struct rtattr tb[], int max, struct rtattr rta, int len)
aba5acdf SH	628	{
175e2440	629	memset(tb, 0, sizeof(struct rtattr ) (max + 1));
aba5acdf SH	630	while (RTA_OK(rta, len)) {
	631	if (rta->rta_type <= max)
	632	tb[rta->rta_type] = rta;
	633	rta = RTA_NEXT(rta,len);
	634	}
	635	if (len)
	636	fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", len, rta->rta_len);
	637	return 0;
	638	}
c7699875	639
	640	int parse_rtattr_byindex(struct rtattr tb[], int max, struct rtattr rta, int len)
	641	{
	642	int i = 0;
175e2440 SH	643
175e2440 SH	644	memset(tb, 0, sizeof(struct rtattr ) max);
c7699875	645	while (RTA_OK(rta, len)) {
175e2440	646	if (rta->rta_type <= max && i < max)
c7699875	647	tb[i++] = rta;
	648	rta = RTA_NEXT(rta,len);
	649	}
	650	if (len)
	651	fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", len, rta->rta_len);
	652	return i;
	653	}
2f90c9c0 PM	654
	655	int __parse_rtattr_nested_compat(struct rtattr tb[], int max, struct rtattr rta,
	656	int len)
	657	{
	658	if (RTA_PAYLOAD(rta) < len)
	659	return -1;
	660	if (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr)) {
	661	rta = RTA_DATA(rta) + RTA_ALIGN(len);
	662	return parse_rtattr_nested(tb, max, rta);
	663	}
037c635e	664	memset(tb, 0, sizeof(struct rtattr ) (max + 1));
2f90c9c0 PM	665	return 0;
2f90c9c0 PM	666	}