[mirror_iproute2.git] / ip / ipmroute.c

/*
 * ipmroute.c		"ip mroute".
 *
 *		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 <inttypes.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>

#include <linux/netdevice.h>
#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/sockios.h>

#include <rt_names.h>
#include "utils.h"
#include "ip_common.h"

static void usage(void) __attribute__((noreturn));

static void usage(void)
{
	fprintf(stderr, "Usage: ip mroute show [ [ to ] PREFIX ] [ from PREFIX ] [ iif DEVICE ]\n");
	fprintf(stderr, "                      [ table TABLE_ID ]\n");
	fprintf(stderr, "TABLE_ID := [ local | main | default | all | NUMBER ]\n");
#if 0
	fprintf(stderr, "Usage: ip mroute [ add | del ] DESTINATION from SOURCE [ iif DEVICE ] [ oif DEVICE ]\n");
#endif
	exit(-1);
}

struct rtfilter
{
	int tb;
	int af;
	int iif;
	inet_prefix mdst;
	inet_prefix msrc;
} filter;

int print_mroute(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
{
	FILE *fp = (FILE*)arg;
	struct rtmsg *r = NLMSG_DATA(n);
	int len = n->nlmsg_len;
	struct rtattr * tb[RTA_MAX+1];
	char abuf[256];
	char obuf[256];
	SPRINT_BUF(b1);
	__u32 table;
	int iif = 0;
	int family;

	if ((n->nlmsg_type != RTM_NEWROUTE &&
	     n->nlmsg_type != RTM_DELROUTE) ||
	    !(n->nlmsg_flags & NLM_F_MULTI)) {
		fprintf(stderr, "Not a multicast route: %08x %08x %08x\n",
			n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
		return 0;
	}
	len -= NLMSG_LENGTH(sizeof(*r));
	if (len < 0) {
		fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
		return -1;
	}
	if (r->rtm_type != RTN_MULTICAST) {
		fprintf(stderr, "Not a multicast route (type: %s)\n",
			rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
		return 0;
	}

	parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
	table = rtm_get_table(r, tb);

	if (filter.tb > 0 && filter.tb != table)
		return 0;

	if (tb[RTA_IIF])
		iif = *(int*)RTA_DATA(tb[RTA_IIF]);
	if (filter.iif && filter.iif != iif)
		return 0;

	if (filter.af && filter.af != r->rtm_family)
		return 0;

	if (tb[RTA_DST] &&
	    filter.mdst.bitlen > 0 &&
	    inet_addr_match(RTA_DATA(tb[RTA_DST]), &filter.mdst, filter.mdst.bitlen))
		return 0;

	if (tb[RTA_SRC] &&
	    filter.msrc.bitlen > 0 &&
	    inet_addr_match(RTA_DATA(tb[RTA_SRC]), &filter.msrc, filter.msrc.bitlen))
		return 0;

	family = r->rtm_family == RTNL_FAMILY_IPMR ? AF_INET : AF_INET6;

	if (n->nlmsg_type == RTM_DELROUTE)
		fprintf(fp, "Deleted ");

	if (tb[RTA_SRC])
		len = snprintf(obuf, sizeof(obuf),
			       "(%s, ", rt_addr_n2a(family,
						    RTA_PAYLOAD(tb[RTA_SRC]),
						    RTA_DATA(tb[RTA_SRC]),
						    abuf, sizeof(abuf)));
	else
		len = sprintf(obuf, "(unknown, ");
	if (tb[RTA_DST])
		snprintf(obuf + len, sizeof(obuf) - len,
			 "%s)", rt_addr_n2a(family,
					    RTA_PAYLOAD(tb[RTA_DST]),
					    RTA_DATA(tb[RTA_DST]),
					    abuf, sizeof(abuf)));
	else
		snprintf(obuf + len, sizeof(obuf) - len, "unknown) ");

	fprintf(fp, "%-32s Iif: ", obuf);
	if (iif)
		fprintf(fp, "%-10s ", ll_index_to_name(iif));
	else
		fprintf(fp, "unresolved ");

	if (tb[RTA_MULTIPATH]) {
		struct rtnexthop *nh = RTA_DATA(tb[RTA_MULTIPATH]);
		int first = 1;

		len = RTA_PAYLOAD(tb[RTA_MULTIPATH]);

		for (;;) {
			if (len < sizeof(*nh))
				break;
			if (nh->rtnh_len > len)
				break;

			if (first) {
				fprintf(fp, "Oifs: ");
				first = 0;
			}
			fprintf(fp, "%s", ll_index_to_name(nh->rtnh_ifindex));
			if (nh->rtnh_hops > 1)
				fprintf(fp, "(ttl %d) ", nh->rtnh_hops);
			else
				fprintf(fp, " ");
			len -= NLMSG_ALIGN(nh->rtnh_len);
			nh = RTNH_NEXT(nh);
		}
	}
	if (show_stats && tb[RTA_MFC_STATS]) {
		struct rta_mfc_stats *mfcs = RTA_DATA(tb[RTA_MFC_STATS]);

		fprintf(fp, "%s  %"PRIu64" packets, %"PRIu64" bytes", _SL_,
			(uint64_t)mfcs->mfcs_packets,
			(uint64_t)mfcs->mfcs_bytes);
		if (mfcs->mfcs_wrong_if)
			fprintf(fp, ", %"PRIu64" arrived on wrong iif.",
				(uint64_t)mfcs->mfcs_wrong_if);
	}
	fprintf(fp, "\n");
	fflush(fp);
	return 0;
}

void ipmroute_reset_filter(int ifindex)
{
	memset(&filter, 0, sizeof(filter));
	filter.mdst.bitlen = -1;
	filter.msrc.bitlen = -1;
	filter.iif = ifindex;
}

static int mroute_list(int argc, char **argv)
{
	char *id = NULL;
	int family;

	ipmroute_reset_filter(0);
	if (preferred_family == AF_UNSPEC)
		family = AF_INET;
	else
		family = AF_INET6;
	if (family == AF_INET) {
		filter.af = RTNL_FAMILY_IPMR;
		filter.tb = RT_TABLE_DEFAULT;  /* for backward compatibility */
	} else
		filter.af = RTNL_FAMILY_IP6MR;

	while (argc > 0) {
		if (matches(*argv, "table") == 0) {
			__u32 tid;
			NEXT_ARG();
			if (rtnl_rttable_a2n(&tid, *argv)) {
				if (strcmp(*argv, "all") == 0) {
					filter.tb = 0;
				} else if (strcmp(*argv, "help") == 0) {
					usage();
				} else {
					invarg("table id value is invalid\n", *argv);
				}
			} else
				filter.tb = tid;
		} else if (strcmp(*argv, "iif") == 0) {
			NEXT_ARG();
			id = *argv;
		} else if (matches(*argv, "from") == 0) {
			NEXT_ARG();
			get_prefix(&filter.msrc, *argv, family);
		} else {
			if (strcmp(*argv, "to") == 0) {
				NEXT_ARG();
			}
			if (matches(*argv, "help") == 0)
				usage();
			get_prefix(&filter.mdst, *argv, family);
		}
		argc--; argv++;
	}

	ll_init_map(&rth);

	if (id)  {
		int idx;

		if ((idx = ll_name_to_index(id)) == 0) {
			fprintf(stderr, "Cannot find device \"%s\"\n", id);
			return -1;
		}
		filter.iif = idx;
	}

	if (rtnl_wilddump_request(&rth, filter.af, RTM_GETROUTE) < 0) {
		perror("Cannot send dump request");
		return 1;
	}

	if (rtnl_dump_filter(&rth, print_mroute, stdout) < 0) {
		fprintf(stderr, "Dump terminated\n");
		exit(1);
	}

	exit(0);
}

int do_multiroute(int argc, char **argv)
{
	if (argc < 1)
		return mroute_list(0, NULL);
#if 0
	if (matches(*argv, "add") == 0)
		return mroute_modify(RTM_NEWADDR, argc-1, argv+1);
	if (matches(*argv, "delete") == 0)
		return mroute_modify(RTM_DELADDR, argc-1, argv+1);
	if (matches(*argv, "get") == 0)
		return mroute_get(argc-1, argv+1);
#endif
	if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
	    || matches(*argv, "lst") == 0)
		return mroute_list(argc-1, argv+1);
	if (matches(*argv, "help") == 0)
		usage();
	fprintf(stderr, "Command \"%s\" is unknown, try \"ip mroute help\".\n", *argv);
	exit(-1);
}
Commit	Line	Data
aba5acdf SH	1	/*
	2	* ipmroute.c "ip mroute".
	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>
e34d3dcc	18	#include <inttypes.h>
aba5acdf SH	19	#include <sys/ioctl.h>
aba5acdf SH	20	#include <sys/socket.h>
03156410 SH	21	#include <netinet/in.h>
	22	#include <arpa/inet.h>
	23	#include <string.h>
	24
aba5acdf SH	25	#include <linux/netdevice.h>
	26	#include <linux/if.h>
	27	#include <linux/if_arp.h>
	28	#include <linux/sockios.h>
aba5acdf	29
e34d3dcc	30	#include <rt_names.h>
aba5acdf	31	#include "utils.h"
e34d3dcc	32	#include "ip_common.h"
aba5acdf SH	33
	34	static void usage(void) __attribute__((noreturn));
	35
	36	static void usage(void)
	37	{
e34d3dcc	38	fprintf(stderr, "Usage: ip mroute show [ [ to ] PREFIX ] [ from PREFIX ] [ iif DEVICE ]\n");
2a898320 ND	39	fprintf(stderr, " [ table TABLE_ID ]\n");
2a898320 ND	40	fprintf(stderr, "TABLE_ID := [ local \| main \| default \| all \| NUMBER ]\n");
aba5acdf SH	41	#if 0
	42	fprintf(stderr, "Usage: ip mroute [ add \| del ] DESTINATION from SOURCE [ iif DEVICE ] [ oif DEVICE ]\n");
	43	#endif
	44	exit(-1);
	45	}
	46
aba5acdf SH	47	struct rtfilter
aba5acdf SH	48	{
e34d3dcc ND	49	int tb;
	50	int af;
	51	int iif;
aba5acdf SH	52	inet_prefix mdst;
	53	inet_prefix msrc;
	54	} filter;
	55
e34d3dcc	56	int print_mroute(const struct sockaddr_nl who, struct nlmsghdr n, void *arg)
aba5acdf	57	{
e34d3dcc ND	58	FILE fp = (FILE)arg;
	59	struct rtmsg *r = NLMSG_DATA(n);
	60	int len = n->nlmsg_len;
	61	struct rtattr * tb[RTA_MAX+1];
	62	char abuf[256];
	63	char obuf[256];
	64	SPRINT_BUF(b1);
	65	__u32 table;
	66	int iif = 0;
	67	int family;
	68
	69	if ((n->nlmsg_type != RTM_NEWROUTE &&
	70	n->nlmsg_type != RTM_DELROUTE) \|\|
	71	!(n->nlmsg_flags & NLM_F_MULTI)) {
	72	fprintf(stderr, "Not a multicast route: %08x %08x %08x\n",
	73	n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
	74	return 0;
67ef60a2	75	}
e34d3dcc ND	76	len -= NLMSG_LENGTH(sizeof(*r));
	77	if (len < 0) {
	78	fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
	79	return -1;
aba5acdf	80	}
e34d3dcc ND	81	if (r->rtm_type != RTN_MULTICAST) {
	82	fprintf(stderr, "Not a multicast route (type: %s)\n",
	83	rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
	84	return 0;
e588a7db	85	}
aba5acdf	86
e34d3dcc ND	87	parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
	88	table = rtm_get_table(r, tb);
	89
	90	if (filter.tb > 0 && filter.tb != table)
	91	return 0;
	92
	93	if (tb[RTA_IIF])
	94	iif = (int)RTA_DATA(tb[RTA_IIF]);
	95	if (filter.iif && filter.iif != iif)
	96	return 0;
	97
	98	if (filter.af && filter.af != r->rtm_family)
	99	return 0;
	100
	101	if (tb[RTA_DST] &&
	102	filter.mdst.bitlen > 0 &&
	103	inet_addr_match(RTA_DATA(tb[RTA_DST]), &filter.mdst, filter.mdst.bitlen))
	104	return 0;
	105
	106	if (tb[RTA_SRC] &&
	107	filter.msrc.bitlen > 0 &&
	108	inet_addr_match(RTA_DATA(tb[RTA_SRC]), &filter.msrc, filter.msrc.bitlen))
	109	return 0;
	110
	111	family = r->rtm_family == RTNL_FAMILY_IPMR ? AF_INET : AF_INET6;
	112
	113	if (n->nlmsg_type == RTM_DELROUTE)
	114	fprintf(fp, "Deleted ");
	115
	116	if (tb[RTA_SRC])
	117	len = snprintf(obuf, sizeof(obuf),
	118	"(%s, ", rt_addr_n2a(family,
26dcdf3a	119	RTA_PAYLOAD(tb[RTA_SRC]),
e34d3dcc ND	120	RTA_DATA(tb[RTA_SRC]),
	121	abuf, sizeof(abuf)));
	122	else
	123	len = sprintf(obuf, "(unknown, ");
	124	if (tb[RTA_DST])
	125	snprintf(obuf + len, sizeof(obuf) - len,
656111b2	126	"%s)", rt_addr_n2a(family,
26dcdf3a	127	RTA_PAYLOAD(tb[RTA_DST]),
e34d3dcc ND	128	RTA_DATA(tb[RTA_DST]),
	129	abuf, sizeof(abuf)));
	130	else
	131	snprintf(obuf + len, sizeof(obuf) - len, "unknown) ");
	132
	133	fprintf(fp, "%-32s Iif: ", obuf);
	134	if (iif)
	135	fprintf(fp, "%-10s ", ll_index_to_name(iif));
	136	else
	137	fprintf(fp, "unresolved ");
	138
	139	if (tb[RTA_MULTIPATH]) {
	140	struct rtnexthop *nh = RTA_DATA(tb[RTA_MULTIPATH]);
	141	int first = 1;
	142
	143	len = RTA_PAYLOAD(tb[RTA_MULTIPATH]);
	144
	145	for (;;) {
	146	if (len < sizeof(*nh))
	147	break;
	148	if (nh->rtnh_len > len)
	149	break;
	150
	151	if (first) {
	152	fprintf(fp, "Oifs: ");
	153	first = 0;
aba5acdf	154	}
e34d3dcc ND	155	fprintf(fp, "%s", ll_index_to_name(nh->rtnh_ifindex));
	156	if (nh->rtnh_hops > 1)
	157	fprintf(fp, "(ttl %d) ", nh->rtnh_hops);
	158	else
	159	fprintf(fp, " ");
	160	len -= NLMSG_ALIGN(nh->rtnh_len);
	161	nh = RTNH_NEXT(nh);
aba5acdf	162	}
aba5acdf	163	}
e34d3dcc ND	164	if (show_stats && tb[RTA_MFC_STATS]) {
	165	struct rta_mfc_stats *mfcs = RTA_DATA(tb[RTA_MFC_STATS]);
	166
	167	fprintf(fp, "%s %"PRIu64" packets, %"PRIu64" bytes", _SL_,
	168	(uint64_t)mfcs->mfcs_packets,
	169	(uint64_t)mfcs->mfcs_bytes);
	170	if (mfcs->mfcs_wrong_if)
	171	fprintf(fp, ", %"PRIu64" arrived on wrong iif.",
	172	(uint64_t)mfcs->mfcs_wrong_if);
	173	}
	174	fprintf(fp, "\n");
	175	fflush(fp);
	176	return 0;
aba5acdf SH	177	}
aba5acdf SH	178
093b7646	179	void ipmroute_reset_filter(int ifindex)
e34d3dcc ND	180	{
	181	memset(&filter, 0, sizeof(filter));
	182	filter.mdst.bitlen = -1;
	183	filter.msrc.bitlen = -1;
093b7646	184	filter.iif = ifindex;
e34d3dcc	185	}
aba5acdf SH	186
	187	static int mroute_list(int argc, char **argv)
	188	{
e34d3dcc ND	189	char *id = NULL;
	190	int family;
	191
093b7646	192	ipmroute_reset_filter(0);
e34d3dcc ND	193	if (preferred_family == AF_UNSPEC)
	194	family = AF_INET;
	195	else
	196	family = AF_INET6;
	197	if (family == AF_INET) {
	198	filter.af = RTNL_FAMILY_IPMR;
	199	filter.tb = RT_TABLE_DEFAULT; /* for backward compatibility */
	200	} else
	201	filter.af = RTNL_FAMILY_IP6MR;
	202
aba5acdf	203	while (argc > 0) {
e34d3dcc ND	204	if (matches(*argv, "table") == 0) {
e34d3dcc ND	205	__u32 tid;
aba5acdf	206	NEXT_ARG();
e34d3dcc ND	207	if (rtnl_rttable_a2n(&tid, *argv)) {
	208	if (strcmp(*argv, "all") == 0) {
	209	filter.tb = 0;
	210	} else if (strcmp(*argv, "help") == 0) {
	211	usage();
	212	} else {
	213	invarg("table id value is invalid\n", *argv);
	214	}
	215	} else
	216	filter.tb = tid;
	217	} else if (strcmp(*argv, "iif") == 0) {
	218	NEXT_ARG();
	219	id = *argv;
aba5acdf SH	220	} else if (matches(*argv, "from") == 0) {
aba5acdf SH	221	NEXT_ARG();
e34d3dcc	222	get_prefix(&filter.msrc, *argv, family);
aba5acdf SH	223	} else {
	224	if (strcmp(*argv, "to") == 0) {
	225	NEXT_ARG();
	226	}
	227	if (matches(*argv, "help") == 0)
	228	usage();
e34d3dcc	229	get_prefix(&filter.mdst, *argv, family);
aba5acdf	230	}
e34d3dcc	231	argc--; argv++;
aba5acdf SH	232	}
aba5acdf SH	233
e34d3dcc ND	234	ll_init_map(&rth);
	235
	236	if (id) {
	237	int idx;
	238
	239	if ((idx = ll_name_to_index(id)) == 0) {
	240	fprintf(stderr, "Cannot find device \"%s\"\n", id);
	241	return -1;
	242	}
	243	filter.iif = idx;
	244	}
	245
	246	if (rtnl_wilddump_request(&rth, filter.af, RTM_GETROUTE) < 0) {
	247	perror("Cannot send dump request");
	248	return 1;
	249	}
	250
	251	if (rtnl_dump_filter(&rth, print_mroute, stdout) < 0) {
	252	fprintf(stderr, "Dump terminated\n");
	253	exit(1);
	254	}
	255
	256	exit(0);
aba5acdf SH	257	}
	258
	259	int do_multiroute(int argc, char **argv)
	260	{
	261	if (argc < 1)
	262	return mroute_list(0, NULL);
	263	#if 0
	264	if (matches(*argv, "add") == 0)
	265	return mroute_modify(RTM_NEWADDR, argc-1, argv+1);
	266	if (matches(*argv, "delete") == 0)
	267	return mroute_modify(RTM_DELADDR, argc-1, argv+1);
	268	if (matches(*argv, "get") == 0)
	269	return mroute_get(argc-1, argv+1);
	270	#endif
	271	if (matches(argv, "list") == 0 \|\| matches(argv, "show") == 0
	272	\|\| matches(*argv, "lst") == 0)
	273	return mroute_list(argc-1, argv+1);
	274	if (matches(*argv, "help") == 0)
	275	usage();
	276	fprintf(stderr, "Command \"%s\" is unknown, try \"ip mroute help\".\n", *argv);
	277	exit(-1);
	278	}