[mirror_iproute2.git] / ip / iprule.c

/*
 * iprule.c		"ip rule".
 *
 *		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 <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <string.h>
#include <linux/fib_rules.h>
#include <errno.h>

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

extern struct rtnl_handle rth;

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

static void usage(void)
{
	fprintf(stderr, "Usage: ip rule { add | del } SELECTOR ACTION\n");
	fprintf(stderr, "       ip rule { flush | save | restore }\n");
	fprintf(stderr, "       ip rule [ list ]\n");
	fprintf(stderr, "SELECTOR := [ not ] [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK[/MASK] ]\n");
	fprintf(stderr, "            [ iif STRING ] [ oif STRING ] [ pref NUMBER ]\n");
	fprintf(stderr, "ACTION := [ table TABLE_ID ]\n");
	fprintf(stderr, "          [ nat ADDRESS ]\n");
	fprintf(stderr, "          [ realms [SRCREALM/]DSTREALM ]\n");
	fprintf(stderr, "          [ goto NUMBER ]\n");
	fprintf(stderr, "          SUPPRESSOR\n");
	fprintf(stderr, "SUPPRESSOR := [ suppress_prefixlength NUMBER ]\n");
	fprintf(stderr, "              [ suppress_ifgroup DEVGROUP ]\n");
	fprintf(stderr, "TABLE_ID := [ local | main | default | NUMBER ]\n");
	exit(-1);
}

int print_rule(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;
	int host_len = -1;
	__u32 table;
	struct rtattr * tb[FRA_MAX+1];
	char abuf[256];
	SPRINT_BUF(b1);

	if (n->nlmsg_type != RTM_NEWRULE && n->nlmsg_type != RTM_DELRULE)
		return 0;

	len -= NLMSG_LENGTH(sizeof(*r));
	if (len < 0)
		return -1;

	parse_rtattr(tb, FRA_MAX, RTM_RTA(r), len);

	host_len = af_bit_len(r->rtm_family);

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

	if (tb[FRA_PRIORITY])
		fprintf(fp, "%u:\t", *(unsigned*)RTA_DATA(tb[FRA_PRIORITY]));
	else
		fprintf(fp, "0:\t");

	if (r->rtm_flags & FIB_RULE_INVERT)
		fprintf(fp, "not ");

	if (tb[FRA_SRC]) {
		if (r->rtm_src_len != host_len) {
			fprintf(fp, "from %s/%u ", rt_addr_n2a(r->rtm_family,
						       RTA_PAYLOAD(tb[FRA_SRC]),
						       RTA_DATA(tb[FRA_SRC]),
						       abuf, sizeof(abuf)),
				r->rtm_src_len
				);
		} else {
			fprintf(fp, "from %s ", format_host(r->rtm_family,
						       RTA_PAYLOAD(tb[FRA_SRC]),
						       RTA_DATA(tb[FRA_SRC]),
						       abuf, sizeof(abuf))
				);
		}
	} else if (r->rtm_src_len) {
		fprintf(fp, "from 0/%d ", r->rtm_src_len);
	} else {
		fprintf(fp, "from all ");
	}

	if (tb[FRA_DST]) {
		if (r->rtm_dst_len != host_len) {
			fprintf(fp, "to %s/%u ", rt_addr_n2a(r->rtm_family,
						       RTA_PAYLOAD(tb[FRA_DST]),
						       RTA_DATA(tb[FRA_DST]),
						       abuf, sizeof(abuf)),
				r->rtm_dst_len
				);
		} else {
			fprintf(fp, "to %s ", format_host(r->rtm_family,
						       RTA_PAYLOAD(tb[FRA_DST]),
						       RTA_DATA(tb[FRA_DST]),
						       abuf, sizeof(abuf)));
		}
	} else if (r->rtm_dst_len) {
		fprintf(fp, "to 0/%d ", r->rtm_dst_len);
	}

	if (r->rtm_tos) {
		SPRINT_BUF(b1);
		fprintf(fp, "tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
	}

	if (tb[FRA_FWMARK] || tb[FRA_FWMASK]) {
		__u32 mark = 0, mask = 0;

		if (tb[FRA_FWMARK])
			mark = rta_getattr_u32(tb[FRA_FWMARK]);

		if (tb[FRA_FWMASK] &&
		    (mask = rta_getattr_u32(tb[FRA_FWMASK])) != 0xFFFFFFFF)
			fprintf(fp, "fwmark 0x%x/0x%x ", mark, mask);
		else
			fprintf(fp, "fwmark 0x%x ", mark);
	}

	if (tb[FRA_IFNAME]) {
		fprintf(fp, "iif %s ", rta_getattr_str(tb[FRA_IFNAME]));
		if (r->rtm_flags & FIB_RULE_IIF_DETACHED)
			fprintf(fp, "[detached] ");
	}

	if (tb[FRA_OIFNAME]) {
		fprintf(fp, "oif %s ", rta_getattr_str(tb[FRA_OIFNAME]));
		if (r->rtm_flags & FIB_RULE_OIF_DETACHED)
			fprintf(fp, "[detached] ");
	}

	table = rtm_get_table(r, tb);
	if (table) {
		fprintf(fp, "lookup %s ", rtnl_rttable_n2a(table, b1, sizeof(b1)));

		if (tb[FRA_SUPPRESS_PREFIXLEN]) {
			int pl = rta_getattr_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
			if (pl != -1) {
				fprintf(fp, "suppress_prefixlength %d ", pl);
			}
		}
		if (tb[FRA_SUPPRESS_IFGROUP]) {
			int group = rta_getattr_u32(tb[FRA_SUPPRESS_IFGROUP]);
			if (group != -1) {
				SPRINT_BUF(b1);
				fprintf(fp, "suppress_ifgroup %s ", rtnl_group_n2a(group, b1, sizeof(b1)));
			}
		}
	}

	if (tb[FRA_FLOW]) {
		__u32 to = rta_getattr_u32(tb[FRA_FLOW]);
		__u32 from = to>>16;
		to &= 0xFFFF;
		if (from) {
			fprintf(fp, "realms %s/",
				rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
		}
		fprintf(fp, "%s ",
			rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
	}

	if (r->rtm_type == RTN_NAT) {
		if (tb[RTA_GATEWAY]) {
			fprintf(fp, "map-to %s ",
				format_host(r->rtm_family,
					    RTA_PAYLOAD(tb[RTA_GATEWAY]),
					    RTA_DATA(tb[RTA_GATEWAY]),
					    abuf, sizeof(abuf)));
		} else
			fprintf(fp, "masquerade");
	} else if (r->rtm_type == FR_ACT_GOTO) {
		fprintf(fp, "goto ");
		if (tb[FRA_GOTO])
			fprintf(fp, "%u", rta_getattr_u32(tb[FRA_GOTO]));
		else
			fprintf(fp, "none");
		if (r->rtm_flags & FIB_RULE_UNRESOLVED)
			fprintf(fp, " [unresolved]");
	} else if (r->rtm_type == FR_ACT_NOP)
		fprintf(fp, "nop");
	else if (r->rtm_type != RTN_UNICAST)
		fprintf(fp, "%s", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));

	fprintf(fp, "\n");
	fflush(fp);
	return 0;
}

static __u32 rule_dump_magic = 0x71706986;

static int save_rule_prep(void)
{
	int ret;

	if (isatty(STDOUT_FILENO)) {
		fprintf(stderr, "Not sending a binary stream to stdout\n");
		return -1;
	}

	ret = write(STDOUT_FILENO, &rule_dump_magic, sizeof(rule_dump_magic));
	if (ret != sizeof(rule_dump_magic)) {
		fprintf(stderr, "Can't write magic to dump file\n");
		return -1;
	}

	return 0;
}

static int save_rule(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
{
	int ret;

	ret = write(STDOUT_FILENO, n, n->nlmsg_len);
	if ((ret > 0) && (ret != n->nlmsg_len)) {
		fprintf(stderr, "Short write while saving nlmsg\n");
		ret = -EIO;
	}

	return ret == n->nlmsg_len ? 0 : ret;
}

static int iprule_list_or_save(int argc, char **argv, int save)
{
	rtnl_filter_t filter = print_rule;
	int af = preferred_family;

	if (af == AF_UNSPEC)
		af = AF_INET;

	if (argc > 0) {
		fprintf(stderr, "\"ip rule %s\" does not take any arguments.\n",
				save ? "save" : "show");
		return -1;
	}

	if (save) {
		if (save_rule_prep())
			return -1;
		filter = save_rule;
	}

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

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

	return 0;
}

static int rule_dump_check_magic(void)
{
	int ret;
	__u32 magic = 0;

	if (isatty(STDIN_FILENO)) {
		fprintf(stderr, "Can't restore rule dump from a terminal\n");
		return -1;
	}

	ret = fread(&magic, sizeof(magic), 1, stdin);
	if (magic != rule_dump_magic) {
		fprintf(stderr, "Magic mismatch (%d elems, %x magic)\n", ret, magic);
		return -1;
	}

	return 0;
}

static int restore_handler(const struct sockaddr_nl *nl,
			   struct rtnl_ctrl_data *ctrl,
			   struct nlmsghdr *n, void *arg)
{
	int ret;

	n->nlmsg_flags |= NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK;

	ll_init_map(&rth);

	ret = rtnl_talk(&rth, n, n, sizeof(*n));
	if ((ret < 0) && (errno == EEXIST))
		ret = 0;

	return ret;
}


static int iprule_restore(void)
{
	if (rule_dump_check_magic())
		exit(-1);

	exit(rtnl_from_file(stdin, &restore_handler, NULL));
}

static int iprule_modify(int cmd, int argc, char **argv)
{
	int table_ok = 0;
	struct {
		struct nlmsghdr	n;
		struct rtmsg		r;
		char  			buf[1024];
	} req;

	memset(&req, 0, sizeof(req));

	req.n.nlmsg_type = cmd;
	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
	req.n.nlmsg_flags = NLM_F_REQUEST;
	req.r.rtm_family = preferred_family;
	req.r.rtm_protocol = RTPROT_BOOT;
	req.r.rtm_scope = RT_SCOPE_UNIVERSE;
	req.r.rtm_table = 0;
	req.r.rtm_type = RTN_UNSPEC;
	req.r.rtm_flags = 0;

	if (cmd == RTM_NEWRULE) {
		req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
		req.r.rtm_type = RTN_UNICAST;
	}

	while (argc > 0) {
		if (strcmp(*argv, "not") == 0) {
			req.r.rtm_flags |= FIB_RULE_INVERT;
		} else if (strcmp(*argv, "from") == 0) {
			inet_prefix dst;
			NEXT_ARG();
			get_prefix(&dst, *argv, req.r.rtm_family);
			req.r.rtm_src_len = dst.bitlen;
			addattr_l(&req.n, sizeof(req), FRA_SRC, &dst.data, dst.bytelen);
		} else if (strcmp(*argv, "to") == 0) {
			inet_prefix dst;
			NEXT_ARG();
			get_prefix(&dst, *argv, req.r.rtm_family);
			req.r.rtm_dst_len = dst.bitlen;
			addattr_l(&req.n, sizeof(req), FRA_DST, &dst.data, dst.bytelen);
		} else if (matches(*argv, "preference") == 0 ||
			   matches(*argv, "order") == 0 ||
			   matches(*argv, "priority") == 0) {
			__u32 pref;
			NEXT_ARG();
			if (get_u32(&pref, *argv, 0))
				invarg("preference value is invalid\n", *argv);
			addattr32(&req.n, sizeof(req), FRA_PRIORITY, pref);
		} else if (strcmp(*argv, "tos") == 0 ||
			   matches(*argv, "dsfield") == 0) {
			__u32 tos;
			NEXT_ARG();
			if (rtnl_dsfield_a2n(&tos, *argv))
				invarg("TOS value is invalid\n", *argv);
			req.r.rtm_tos = tos;
		} else if (strcmp(*argv, "fwmark") == 0) {
			char *slash;
			__u32 fwmark, fwmask;
			NEXT_ARG();
			if ((slash = strchr(*argv, '/')) != NULL)
				*slash = '\0';
			if (get_u32(&fwmark, *argv, 0))
				invarg("fwmark value is invalid\n", *argv);
			addattr32(&req.n, sizeof(req), FRA_FWMARK, fwmark);
			if (slash) {
				if (get_u32(&fwmask, slash+1, 0))
					invarg("fwmask value is invalid\n", slash+1);
				addattr32(&req.n, sizeof(req), FRA_FWMASK, fwmask);
			}
		} else if (matches(*argv, "realms") == 0) {
			__u32 realm;
			NEXT_ARG();
			if (get_rt_realms_or_raw(&realm, *argv))
				invarg("invalid realms\n", *argv);
			addattr32(&req.n, sizeof(req), FRA_FLOW, realm);
		} else if (matches(*argv, "table") == 0 ||
			   strcmp(*argv, "lookup") == 0) {
			__u32 tid;
			NEXT_ARG();
			if (rtnl_rttable_a2n(&tid, *argv))
				invarg("invalid table ID\n", *argv);
			if (tid < 256)
				req.r.rtm_table = tid;
			else {
				req.r.rtm_table = RT_TABLE_UNSPEC;
				addattr32(&req.n, sizeof(req), FRA_TABLE, tid);
			}
			table_ok = 1;
		} else if (matches(*argv, "suppress_prefixlength") == 0 ||
			   strcmp(*argv, "sup_pl") == 0) {
			int pl;
			NEXT_ARG();
			if (get_s32(&pl, *argv, 0) || pl < 0)
				invarg("suppress_prefixlength value is invalid\n", *argv);
			addattr32(&req.n, sizeof(req), FRA_SUPPRESS_PREFIXLEN, pl);
		} else if (matches(*argv, "suppress_ifgroup") == 0 ||
			   strcmp(*argv, "sup_group") == 0) {
			NEXT_ARG();
			int group;
			if (rtnl_group_a2n(&group, *argv))
				invarg("Invalid \"suppress_ifgroup\" value\n", *argv);
			addattr32(&req.n, sizeof(req), FRA_SUPPRESS_IFGROUP, group);
		} else if (strcmp(*argv, "dev") == 0 ||
			   strcmp(*argv, "iif") == 0) {
			NEXT_ARG();
			addattr_l(&req.n, sizeof(req), FRA_IFNAME, *argv, strlen(*argv)+1);
		} else if (strcmp(*argv, "oif") == 0) {
			NEXT_ARG();
			addattr_l(&req.n, sizeof(req), FRA_OIFNAME, *argv, strlen(*argv)+1);
		} else if (strcmp(*argv, "nat") == 0 ||
			   matches(*argv, "map-to") == 0) {
			NEXT_ARG();
			fprintf(stderr, "Warning: route NAT is deprecated\n");
			addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv));
			req.r.rtm_type = RTN_NAT;
		} else {
			int type;

			if (strcmp(*argv, "type") == 0) {
				NEXT_ARG();
			}
			if (matches(*argv, "help") == 0)
				usage();
			else if (matches(*argv, "goto") == 0) {
				__u32 target;
				type = FR_ACT_GOTO;
				NEXT_ARG();
				if (get_u32(&target, *argv, 0))
					invarg("invalid target\n", *argv);
				addattr32(&req.n, sizeof(req), FRA_GOTO, target);
			} else if (matches(*argv, "nop") == 0)
				type = FR_ACT_NOP;
			else if (rtnl_rtntype_a2n(&type, *argv))
				invarg("Failed to parse rule type", *argv);
			req.r.rtm_type = type;
			table_ok = 1;
		}
		argc--;
		argv++;
	}

	if (req.r.rtm_family == AF_UNSPEC)
		req.r.rtm_family = AF_INET;

	if (!table_ok && cmd == RTM_NEWRULE)
		req.r.rtm_table = RT_TABLE_MAIN;

	if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
		return -2;

	return 0;
}


static int flush_rule(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
{
	struct rtnl_handle rth2;
	struct rtmsg *r = NLMSG_DATA(n);
	int len = n->nlmsg_len;
	struct rtattr * tb[FRA_MAX+1];

	len -= NLMSG_LENGTH(sizeof(*r));
	if (len < 0)
		return -1;

	parse_rtattr(tb, FRA_MAX, RTM_RTA(r), len);

	if (tb[FRA_PRIORITY]) {
		n->nlmsg_type = RTM_DELRULE;
		n->nlmsg_flags = NLM_F_REQUEST;

		if (rtnl_open(&rth2, 0) < 0)
			return -1;

		if (rtnl_talk(&rth2, n, NULL, 0) < 0)
			return -2;

		rtnl_close(&rth2);
	}

	return 0;
}

static int iprule_flush(int argc, char **argv)
{
	int af = preferred_family;

	if (af == AF_UNSPEC)
		af = AF_INET;

	if (argc > 0) {
		fprintf(stderr, "\"ip rule flush\" does not allow arguments\n");
		return -1;
	}

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

	if (rtnl_dump_filter(&rth, flush_rule, NULL) < 0) {
		fprintf(stderr, "Flush terminated\n");
		return 1;
	}

	return 0;
}

int do_iprule(int argc, char **argv)
{
	if (argc < 1) {
		return iprule_list_or_save(0, NULL, 0);
	} else if (matches(argv[0], "list") == 0 ||
		   matches(argv[0], "lst") == 0 ||
		   matches(argv[0], "show") == 0) {
		return iprule_list_or_save(argc-1, argv+1, 0);
	} else if (matches(argv[0], "save") == 0) {
		return iprule_list_or_save(argc-1, argv+1, 1);
	} else if (matches(argv[0], "restore") == 0) {
		return iprule_restore();
	} else if (matches(argv[0], "add") == 0) {
		return iprule_modify(RTM_NEWRULE, argc-1, argv+1);
	} else if (matches(argv[0], "delete") == 0) {
		return iprule_modify(RTM_DELRULE, argc-1, argv+1);
	} else if (matches(argv[0], "flush") == 0) {
		return iprule_flush(argc-1, argv+1);
	} else if (matches(argv[0], "help") == 0)
		usage();

	fprintf(stderr, "Command \"%s\" is unknown, try \"ip rule help\".\n", *argv);
	exit(-1);
}

int do_multirule(int argc, char **argv)
{
	switch (preferred_family) {
	case AF_UNSPEC:
	case AF_INET:
		preferred_family = RTNL_FAMILY_IPMR;
		break;
	case AF_INET6:
		preferred_family = RTNL_FAMILY_IP6MR;
		break;
	case RTNL_FAMILY_IPMR:
	case RTNL_FAMILY_IP6MR:
		break;
	default:
		fprintf(stderr, "Multicast rules are only supported for IPv4/IPv6, was: %i\n",
			preferred_family);
		exit(-1);
	}

	return do_iprule(argc, argv);
}
Commit	Line	Data
aba5acdf SH	1	/*
	2	* iprule.c "ip rule".
	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	*
aba5acdf SH	11	*/
	12
	13	#include <stdio.h>
	14	#include <stdlib.h>
	15	#include <unistd.h>
	16	#include <syslog.h>
	17	#include <fcntl.h>
	18	#include <sys/socket.h>
	19	#include <netinet/in.h>
	20	#include <netinet/ip.h>
	21	#include <arpa/inet.h>
	22	#include <string.h>
3123a0cc	23	#include <linux/fib_rules.h>
2f4e171f	24	#include <errno.h>
aba5acdf SH	25
	26	#include "rt_names.h"
	27	#include "utils.h"
34e95647	28	#include "ip_common.h"
aba5acdf	29
351efcde SH	30	extern struct rtnl_handle rth;
351efcde SH	31
aba5acdf SH	32	static void usage(void) __attribute__((noreturn));
	33
	34	static void usage(void)
	35	{
67eedcd9 PS	36	fprintf(stderr, "Usage: ip rule { add \| del } SELECTOR ACTION\n");
	37	fprintf(stderr, " ip rule { flush \| save \| restore }\n");
	38	fprintf(stderr, " ip rule [ list ]\n");
be7f286e	39	fprintf(stderr, "SELECTOR := [ not ] [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK[/MASK] ]\n");
85eae222	40	fprintf(stderr, " [ iif STRING ] [ oif STRING ] [ pref NUMBER ]\n");
526afe40	41	fprintf(stderr, "ACTION := [ table TABLE_ID ]\n");
20f2af78	42	fprintf(stderr, " [ nat ADDRESS ]\n");
aba5acdf	43	fprintf(stderr, " [ realms [SRCREALM/]DSTREALM ]\n");
6b469cae	44	fprintf(stderr, " [ goto NUMBER ]\n");
b1d0525f ST	45	fprintf(stderr, " SUPPRESSOR\n");
	46	fprintf(stderr, "SUPPRESSOR := [ suppress_prefixlength NUMBER ]\n");
	47	fprintf(stderr, " [ suppress_ifgroup DEVGROUP ]\n");
aba5acdf SH	48	fprintf(stderr, "TABLE_ID := [ local \| main \| default \| NUMBER ]\n");
	49	exit(-1);
	50	}
	51
98bde989	52	int print_rule(const struct sockaddr_nl who, struct nlmsghdr n, void *arg)
aba5acdf SH	53	{
	54	FILE fp = (FILE)arg;
	55	struct rtmsg *r = NLMSG_DATA(n);
	56	int len = n->nlmsg_len;
	57	int host_len = -1;
34e95647	58	__u32 table;
ad1a12db	59	struct rtattr * tb[FRA_MAX+1];
aba5acdf SH	60	char abuf[256];
	61	SPRINT_BUF(b1);
	62
98bde989	63	if (n->nlmsg_type != RTM_NEWRULE && n->nlmsg_type != RTM_DELRULE)
aba5acdf SH	64	return 0;
	65
	66	len -= NLMSG_LENGTH(sizeof(*r));
	67	if (len < 0)
	68	return -1;
	69
ad1a12db	70	parse_rtattr(tb, FRA_MAX, RTM_RTA(r), len);
aba5acdf	71
f3a2ddc1	72	host_len = af_bit_len(r->rtm_family);
aba5acdf	73
98bde989 TG	74	if (n->nlmsg_type == RTM_DELRULE)
	75	fprintf(fp, "Deleted ");
	76
ad1a12db PM	77	if (tb[FRA_PRIORITY])
ad1a12db PM	78	fprintf(fp, "%u:\t", (unsigned)RTA_DATA(tb[FRA_PRIORITY]));
aba5acdf SH	79	else
	80	fprintf(fp, "0:\t");
	81
3123a0cc TG	82	if (r->rtm_flags & FIB_RULE_INVERT)
	83	fprintf(fp, "not ");
	84
ad1a12db	85	if (tb[FRA_SRC]) {
aba5acdf SH	86	if (r->rtm_src_len != host_len) {
aba5acdf SH	87	fprintf(fp, "from %s/%u ", rt_addr_n2a(r->rtm_family,
26dcdf3a EB	88	RTA_PAYLOAD(tb[FRA_SRC]),
	89	RTA_DATA(tb[FRA_SRC]),
	90	abuf, sizeof(abuf)),
aba5acdf SH	91	r->rtm_src_len
	92	);
	93	} else {
	94	fprintf(fp, "from %s ", format_host(r->rtm_family,
ad1a12db PM	95	RTA_PAYLOAD(tb[FRA_SRC]),
ad1a12db PM	96	RTA_DATA(tb[FRA_SRC]),
aba5acdf SH	97	abuf, sizeof(abuf))
	98	);
	99	}
	100	} else if (r->rtm_src_len) {
	101	fprintf(fp, "from 0/%d ", r->rtm_src_len);
	102	} else {
	103	fprintf(fp, "from all ");
	104	}
	105
ad1a12db	106	if (tb[FRA_DST]) {
aba5acdf SH	107	if (r->rtm_dst_len != host_len) {
aba5acdf SH	108	fprintf(fp, "to %s/%u ", rt_addr_n2a(r->rtm_family,
26dcdf3a EB	109	RTA_PAYLOAD(tb[FRA_DST]),
	110	RTA_DATA(tb[FRA_DST]),
	111	abuf, sizeof(abuf)),
aba5acdf SH	112	r->rtm_dst_len
	113	);
	114	} else {
	115	fprintf(fp, "to %s ", format_host(r->rtm_family,
ad1a12db PM	116	RTA_PAYLOAD(tb[FRA_DST]),
ad1a12db PM	117	RTA_DATA(tb[FRA_DST]),
aba5acdf SH	118	abuf, sizeof(abuf)));
	119	}
	120	} else if (r->rtm_dst_len) {
	121	fprintf(fp, "to 0/%d ", r->rtm_dst_len);
	122	}
	123
	124	if (r->rtm_tos) {
	125	SPRINT_BUF(b1);
	126	fprintf(fp, "tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
	127	}
ad1a12db	128
4806867a	129	if (tb[FRA_FWMARK] \|\| tb[FRA_FWMASK]) {
be7f286e PM	130	__u32 mark = 0, mask = 0;
be7f286e PM	131
ad1a12db	132	if (tb[FRA_FWMARK])
ff24746c	133	mark = rta_getattr_u32(tb[FRA_FWMARK]);
be7f286e	134
ad1a12db	135	if (tb[FRA_FWMASK] &&
ff24746c	136	(mask = rta_getattr_u32(tb[FRA_FWMASK])) != 0xFFFFFFFF)
be7f286e	137	fprintf(fp, "fwmark 0x%x/0x%x ", mark, mask);
81c61790	138	else
be7f286e	139	fprintf(fp, "fwmark 0x%x ", mark);
aba5acdf SH	140	}
aba5acdf SH	141
ad1a12db	142	if (tb[FRA_IFNAME]) {
ff24746c	143	fprintf(fp, "iif %s ", rta_getattr_str(tb[FRA_IFNAME]));
85eae222 PM	144	if (r->rtm_flags & FIB_RULE_IIF_DETACHED)
	145	fprintf(fp, "[detached] ");
	146	}
	147
	148	if (tb[FRA_OIFNAME]) {
ff24746c	149	fprintf(fp, "oif %s ", rta_getattr_str(tb[FRA_OIFNAME]));
85eae222	150	if (r->rtm_flags & FIB_RULE_OIF_DETACHED)
6b469cae	151	fprintf(fp, "[detached] ");
aba5acdf SH	152	}
aba5acdf SH	153
34e95647	154	table = rtm_get_table(r, tb);
b1d0525f	155	if (table) {
34e95647	156	fprintf(fp, "lookup %s ", rtnl_rttable_n2a(table, b1, sizeof(b1)));
aba5acdf	157
b1d0525f ST	158	if (tb[FRA_SUPPRESS_PREFIXLEN]) {
	159	int pl = rta_getattr_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
	160	if (pl != -1) {
	161	fprintf(fp, "suppress_prefixlength %d ", pl);
	162	}
	163	}
	164	if (tb[FRA_SUPPRESS_IFGROUP]) {
	165	int group = rta_getattr_u32(tb[FRA_SUPPRESS_IFGROUP]);
	166	if (group != -1) {
	167	SPRINT_BUF(b1);
	168	fprintf(fp, "suppress_ifgroup %s ", rtnl_group_n2a(group, b1, sizeof(b1)));
	169	}
	170	}
	171	}
	172
ad1a12db	173	if (tb[FRA_FLOW]) {
ff24746c	174	__u32 to = rta_getattr_u32(tb[FRA_FLOW]);
aba5acdf SH	175	__u32 from = to>>16;
	176	to &= 0xFFFF;
	177	if (from) {
	178	fprintf(fp, "realms %s/",
	179	rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
	180	}
	181	fprintf(fp, "%s ",
	182	rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
	183	}
	184
	185	if (r->rtm_type == RTN_NAT) {
	186	if (tb[RTA_GATEWAY]) {
ae665a52	187	fprintf(fp, "map-to %s ",
aba5acdf SH	188	format_host(r->rtm_family,
	189	RTA_PAYLOAD(tb[RTA_GATEWAY]),
	190	RTA_DATA(tb[RTA_GATEWAY]),
	191	abuf, sizeof(abuf)));
	192	} else
	193	fprintf(fp, "masquerade");
6b469cae TG	194	} else if (r->rtm_type == FR_ACT_GOTO) {
	195	fprintf(fp, "goto ");
	196	if (tb[FRA_GOTO])
ff24746c	197	fprintf(fp, "%u", rta_getattr_u32(tb[FRA_GOTO]));
6b469cae TG	198	else
	199	fprintf(fp, "none");
	200	if (r->rtm_flags & FIB_RULE_UNRESOLVED)
	201	fprintf(fp, " [unresolved]");
	202	} else if (r->rtm_type == FR_ACT_NOP)
	203	fprintf(fp, "nop");
	204	else if (r->rtm_type != RTN_UNICAST)
aba5acdf SH	205	fprintf(fp, "%s", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
	206
	207	fprintf(fp, "\n");
	208	fflush(fp);
	209	return 0;
	210	}
	211
2f4e171f KT	212	static __u32 rule_dump_magic = 0x71706986;
	213
	214	static int save_rule_prep(void)
	215	{
	216	int ret;
	217
	218	if (isatty(STDOUT_FILENO)) {
	219	fprintf(stderr, "Not sending a binary stream to stdout\n");
	220	return -1;
	221	}
	222
	223	ret = write(STDOUT_FILENO, &rule_dump_magic, sizeof(rule_dump_magic));
	224	if (ret != sizeof(rule_dump_magic)) {
	225	fprintf(stderr, "Can't write magic to dump file\n");
	226	return -1;
	227	}
	228
	229	return 0;
	230	}
	231
	232	static int save_rule(const struct sockaddr_nl who, struct nlmsghdr n, void *arg)
aba5acdf	233	{
2f4e171f KT	234	int ret;
	235
	236	ret = write(STDOUT_FILENO, n, n->nlmsg_len);
	237	if ((ret > 0) && (ret != n->nlmsg_len)) {
	238	fprintf(stderr, "Short write while saving nlmsg\n");
	239	ret = -EIO;
	240	}
	241
	242	return ret == n->nlmsg_len ? 0 : ret;
	243	}
	244
	245	static int iprule_list_or_save(int argc, char **argv, int save)
	246	{
	247	rtnl_filter_t filter = print_rule;
aba5acdf SH	248	int af = preferred_family;
	249
	250	if (af == AF_UNSPEC)
	251	af = AF_INET;
	252
	253	if (argc > 0) {
2f4e171f KT	254	fprintf(stderr, "\"ip rule %s\" does not take any arguments.\n",
2f4e171f KT	255	save ? "save" : "show");
aba5acdf SH	256	return -1;
	257	}
	258
2f4e171f KT	259	if (save) {
	260	if (save_rule_prep())
	261	return -1;
	262	filter = save_rule;
	263	}
	264
aba5acdf SH	265	if (rtnl_wilddump_request(&rth, af, RTM_GETRULE) < 0) {
	266	perror("Cannot send dump request");
	267	return 1;
	268	}
	269
2f4e171f	270	if (rtnl_dump_filter(&rth, filter, stdout) < 0) {
aba5acdf SH	271	fprintf(stderr, "Dump terminated\n");
	272	return 1;
	273	}
	274
	275	return 0;
	276	}
	277
2f4e171f KT	278	static int rule_dump_check_magic(void)
	279	{
	280	int ret;
	281	__u32 magic = 0;
	282
	283	if (isatty(STDIN_FILENO)) {
	284	fprintf(stderr, "Can't restore rule dump from a terminal\n");
	285	return -1;
	286	}
	287
	288	ret = fread(&magic, sizeof(magic), 1, stdin);
	289	if (magic != rule_dump_magic) {
	290	fprintf(stderr, "Magic mismatch (%d elems, %x magic)\n", ret, magic);
	291	return -1;
	292	}
	293
	294	return 0;
	295	}
	296
	297	static int restore_handler(const struct sockaddr_nl *nl,
	298	struct rtnl_ctrl_data *ctrl,
	299	struct nlmsghdr n, void arg)
	300	{
	301	int ret;
	302
	303	n->nlmsg_flags \|= NLM_F_REQUEST \| NLM_F_CREATE \| NLM_F_ACK;
	304
	305	ll_init_map(&rth);
	306
	307	ret = rtnl_talk(&rth, n, n, sizeof(*n));
	308	if ((ret < 0) && (errno == EEXIST))
	309	ret = 0;
	310
	311	return ret;
	312	}
	313
	314
	315	static int iprule_restore(void)
	316	{
	317	if (rule_dump_check_magic())
	318	exit(-1);
	319
	320	exit(rtnl_from_file(stdin, &restore_handler, NULL));
	321	}
aba5acdf	322
50772dc5	323	static int iprule_modify(int cmd, int argc, char **argv)
aba5acdf SH	324	{
aba5acdf SH	325	int table_ok = 0;
aba5acdf	326	struct {
4806867a SH	327	struct nlmsghdr n;
	328	struct rtmsg r;
	329	char buf[1024];
aba5acdf SH	330	} req;
	331
	332	memset(&req, 0, sizeof(req));
	333
	334	req.n.nlmsg_type = cmd;
	335	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
	336	req.n.nlmsg_flags = NLM_F_REQUEST;
	337	req.r.rtm_family = preferred_family;
	338	req.r.rtm_protocol = RTPROT_BOOT;
	339	req.r.rtm_scope = RT_SCOPE_UNIVERSE;
	340	req.r.rtm_table = 0;
	341	req.r.rtm_type = RTN_UNSPEC;
3123a0cc	342	req.r.rtm_flags = 0;
aba5acdf SH	343
	344	if (cmd == RTM_NEWRULE) {
	345	req.n.nlmsg_flags \|= NLM_F_CREATE\|NLM_F_EXCL;
	346	req.r.rtm_type = RTN_UNICAST;
	347	}
	348
	349	while (argc > 0) {
3123a0cc TG	350	if (strcmp(*argv, "not") == 0) {
	351	req.r.rtm_flags \|= FIB_RULE_INVERT;
	352	} else if (strcmp(*argv, "from") == 0) {
aba5acdf SH	353	inet_prefix dst;
	354	NEXT_ARG();
	355	get_prefix(&dst, *argv, req.r.rtm_family);
	356	req.r.rtm_src_len = dst.bitlen;
ad1a12db	357	addattr_l(&req.n, sizeof(req), FRA_SRC, &dst.data, dst.bytelen);
aba5acdf SH	358	} else if (strcmp(*argv, "to") == 0) {
	359	inet_prefix dst;
	360	NEXT_ARG();
	361	get_prefix(&dst, *argv, req.r.rtm_family);
	362	req.r.rtm_dst_len = dst.bitlen;
ad1a12db	363	addattr_l(&req.n, sizeof(req), FRA_DST, &dst.data, dst.bytelen);
aba5acdf SH	364	} else if (matches(*argv, "preference") == 0 \|\|
	365	matches(*argv, "order") == 0 \|\|
	366	matches(*argv, "priority") == 0) {
	367	__u32 pref;
	368	NEXT_ARG();
	369	if (get_u32(&pref, *argv, 0))
	370	invarg("preference value is invalid\n", *argv);
ad1a12db	371	addattr32(&req.n, sizeof(req), FRA_PRIORITY, pref);
dec01609 AH	372	} else if (strcmp(*argv, "tos") == 0 \|\|
dec01609 AH	373	matches(*argv, "dsfield") == 0) {
aba5acdf SH	374	__u32 tos;
	375	NEXT_ARG();
	376	if (rtnl_dsfield_a2n(&tos, *argv))
	377	invarg("TOS value is invalid\n", *argv);
	378	req.r.rtm_tos = tos;
	379	} else if (strcmp(*argv, "fwmark") == 0) {
be7f286e PM	380	char *slash;
be7f286e PM	381	__u32 fwmark, fwmask;
aba5acdf	382	NEXT_ARG();
be7f286e PM	383	if ((slash = strchr(*argv, '/')) != NULL)
be7f286e PM	384	*slash = '\0';
4fb466f9	385	if (get_u32(&fwmark, *argv, 0))
aba5acdf	386	invarg("fwmark value is invalid\n", *argv);
ad1a12db	387	addattr32(&req.n, sizeof(req), FRA_FWMARK, fwmark);
be7f286e PM	388	if (slash) {
	389	if (get_u32(&fwmask, slash+1, 0))
	390	invarg("fwmask value is invalid\n", slash+1);
ad1a12db	391	addattr32(&req.n, sizeof(req), FRA_FWMASK, fwmask);
be7f286e	392	}
aba5acdf SH	393	} else if (matches(*argv, "realms") == 0) {
	394	__u32 realm;
	395	NEXT_ARG();
d583e88e	396	if (get_rt_realms_or_raw(&realm, *argv))
aba5acdf	397	invarg("invalid realms\n", *argv);
ad1a12db	398	addattr32(&req.n, sizeof(req), FRA_FLOW, realm);
aba5acdf SH	399	} else if (matches(*argv, "table") == 0 \|\|
aba5acdf SH	400	strcmp(*argv, "lookup") == 0) {
f332d169	401	__u32 tid;
aba5acdf SH	402	NEXT_ARG();
	403	if (rtnl_rttable_a2n(&tid, *argv))
	404	invarg("invalid table ID\n", *argv);
34e95647 PM	405	if (tid < 256)
	406	req.r.rtm_table = tid;
	407	else {
	408	req.r.rtm_table = RT_TABLE_UNSPEC;
ad1a12db	409	addattr32(&req.n, sizeof(req), FRA_TABLE, tid);
34e95647	410	}
aba5acdf	411	table_ok = 1;
b1d0525f ST	412	} else if (matches(*argv, "suppress_prefixlength") == 0 \|\|
	413	strcmp(*argv, "sup_pl") == 0) {
	414	int pl;
	415	NEXT_ARG();
	416	if (get_s32(&pl, *argv, 0) \|\| pl < 0)
	417	invarg("suppress_prefixlength value is invalid\n", *argv);
	418	addattr32(&req.n, sizeof(req), FRA_SUPPRESS_PREFIXLEN, pl);
	419	} else if (matches(*argv, "suppress_ifgroup") == 0 \|\|
	420	strcmp(*argv, "sup_group") == 0) {
	421	NEXT_ARG();
	422	int group;
	423	if (rtnl_group_a2n(&group, *argv))
	424	invarg("Invalid \"suppress_ifgroup\" value\n", *argv);
	425	addattr32(&req.n, sizeof(req), FRA_SUPPRESS_IFGROUP, group);
aba5acdf SH	426	} else if (strcmp(*argv, "dev") == 0 \|\|
	427	strcmp(*argv, "iif") == 0) {
	428	NEXT_ARG();
ad1a12db	429	addattr_l(&req.n, sizeof(req), FRA_IFNAME, argv, strlen(argv)+1);
85eae222 PM	430	} else if (strcmp(*argv, "oif") == 0) {
	431	NEXT_ARG();
	432	addattr_l(&req.n, sizeof(req), FRA_OIFNAME, argv, strlen(argv)+1);
aba5acdf SH	433	} else if (strcmp(*argv, "nat") == 0 \|\|
	434	matches(*argv, "map-to") == 0) {
	435	NEXT_ARG();
526afe40	436	fprintf(stderr, "Warning: route NAT is deprecated\n");
aba5acdf SH	437	addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv));
	438	req.r.rtm_type = RTN_NAT;
	439	} else {
	440	int type;
	441
	442	if (strcmp(*argv, "type") == 0) {
	443	NEXT_ARG();
	444	}
	445	if (matches(*argv, "help") == 0)
	446	usage();
6b469cae TG	447	else if (matches(*argv, "goto") == 0) {
	448	__u32 target;
	449	type = FR_ACT_GOTO;
	450	NEXT_ARG();
	451	if (get_u32(&target, *argv, 0))
	452	invarg("invalid target\n", *argv);
	453	addattr32(&req.n, sizeof(req), FRA_GOTO, target);
	454	} else if (matches(*argv, "nop") == 0)
	455	type = FR_ACT_NOP;
	456	else if (rtnl_rtntype_a2n(&type, *argv))
aba5acdf SH	457	invarg("Failed to parse rule type", *argv);
aba5acdf SH	458	req.r.rtm_type = type;
6b469cae	459	table_ok = 1;
aba5acdf SH	460	}
	461	argc--;
	462	argv++;
	463	}
	464
	465	if (req.r.rtm_family == AF_UNSPEC)
	466	req.r.rtm_family = AF_INET;
	467
	468	if (!table_ok && cmd == RTM_NEWRULE)
	469	req.r.rtm_table = RT_TABLE_MAIN;
	470
c079e121	471	if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
076ae708	472	return -2;
aba5acdf SH	473
	474	return 0;
	475	}
	476
50772dc5 SH	477
	478	static int flush_rule(const struct sockaddr_nl who, struct nlmsghdr n, void *arg)
	479	{
b77caeba	480	struct rtnl_handle rth2;
50772dc5 SH	481	struct rtmsg *r = NLMSG_DATA(n);
50772dc5 SH	482	int len = n->nlmsg_len;
ad1a12db	483	struct rtattr * tb[FRA_MAX+1];
50772dc5 SH	484
	485	len -= NLMSG_LENGTH(sizeof(*r));
	486	if (len < 0)
	487	return -1;
	488
ad1a12db	489	parse_rtattr(tb, FRA_MAX, RTM_RTA(r), len);
50772dc5	490
ad1a12db	491	if (tb[FRA_PRIORITY]) {
50772dc5 SH	492	n->nlmsg_type = RTM_DELRULE;
	493	n->nlmsg_flags = NLM_F_REQUEST;
	494
b77caeba SH	495	if (rtnl_open(&rth2, 0) < 0)
	496	return -1;
	497
c079e121	498	if (rtnl_talk(&rth2, n, NULL, 0) < 0)
50772dc5	499	return -2;
b77caeba SH	500
b77caeba SH	501	rtnl_close(&rth2);
50772dc5 SH	502	}
	503
	504	return 0;
	505	}
	506
	507	static int iprule_flush(int argc, char **argv)
	508	{
50772dc5 SH	509	int af = preferred_family;
	510
	511	if (af == AF_UNSPEC)
	512	af = AF_INET;
	513
	514	if (argc > 0) {
66081849	515	fprintf(stderr, "\"ip rule flush\" does not allow arguments\n");
50772dc5 SH	516	return -1;
	517	}
	518
50772dc5 SH	519	if (rtnl_wilddump_request(&rth, af, RTM_GETRULE) < 0) {
	520	perror("Cannot send dump request");
	521	return 1;
	522	}
	523
cd70f3f5	524	if (rtnl_dump_filter(&rth, flush_rule, NULL) < 0) {
50772dc5 SH	525	fprintf(stderr, "Flush terminated\n");
	526	return 1;
	527	}
	528
	529	return 0;
	530	}
	531
aba5acdf SH	532	int do_iprule(int argc, char **argv)
	533	{
	534	if (argc < 1) {
2f4e171f	535	return iprule_list_or_save(0, NULL, 0);
aba5acdf SH	536	} else if (matches(argv[0], "list") == 0 \|\|
	537	matches(argv[0], "lst") == 0 \|\|
	538	matches(argv[0], "show") == 0) {
2f4e171f KT	539	return iprule_list_or_save(argc-1, argv+1, 0);
	540	} else if (matches(argv[0], "save") == 0) {
	541	return iprule_list_or_save(argc-1, argv+1, 1);
	542	} else if (matches(argv[0], "restore") == 0) {
	543	return iprule_restore();
aba5acdf SH	544	} else if (matches(argv[0], "add") == 0) {
	545	return iprule_modify(RTM_NEWRULE, argc-1, argv+1);
	546	} else if (matches(argv[0], "delete") == 0) {
	547	return iprule_modify(RTM_DELRULE, argc-1, argv+1);
50772dc5 SH	548	} else if (matches(argv[0], "flush") == 0) {
50772dc5 SH	549	return iprule_flush(argc-1, argv+1);
aba5acdf SH	550	} else if (matches(argv[0], "help") == 0)
	551	usage();
	552
	553	fprintf(stderr, "Command \"%s\" is unknown, try \"ip rule help\".\n", *argv);
	554	exit(-1);
	555	}
	556
b6c8e808 PM	557	int do_multirule(int argc, char **argv)
	558	{
	559	switch (preferred_family) {
	560	case AF_UNSPEC:
	561	case AF_INET:
	562	preferred_family = RTNL_FAMILY_IPMR;
	563	break;
	564	case AF_INET6:
	565	preferred_family = RTNL_FAMILY_IP6MR;
	566	break;
0d1c9b57 BG	567	case RTNL_FAMILY_IPMR:
	568	case RTNL_FAMILY_IP6MR:
	569	break;
b6c8e808	570	default:
0d1c9b57 BG	571	fprintf(stderr, "Multicast rules are only supported for IPv4/IPv6, was: %i\n",
0d1c9b57 BG	572	preferred_family);
b6c8e808 PM	573	exit(-1);
	574	}
	575
	576	return do_iprule(argc, argv);
	577	}