[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];
	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_rta(r->rtm_family, tb[FRA_SRC]),
			        r->rtm_src_len);
		} else {
			fprintf(fp, "from %s ",
			        format_host_rta(r->rtm_family, tb[FRA_SRC]));
		}
	} 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_rta(r->rtm_family, tb[FRA_DST]),
			        r->rtm_dst_len);
		} else {
			fprintf(fp, "to %s ",
			        format_host_rta(r->rtm_family, tb[FRA_DST]));
		}
	} 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_rta(r->rtm_family,
			                        tb[RTA_GATEWAY]));
		} 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	53	{
56f5daac	54	FILE fp = (FILE )arg;
aba5acdf SH	55	struct rtmsg *r = NLMSG_DATA(n);
	56	int len = n->nlmsg_len;
	57	int host_len = -1;
34e95647	58	__u32 table;
56f5daac	59	struct rtattr *tb[FRA_MAX+1];
aba5acdf SH	60	SPRINT_BUF(b1);
aba5acdf SH	61
98bde989	62	if (n->nlmsg_type != RTM_NEWRULE && n->nlmsg_type != RTM_DELRULE)
aba5acdf SH	63	return 0;
	64
	65	len -= NLMSG_LENGTH(sizeof(*r));
	66	if (len < 0)
	67	return -1;
	68
ad1a12db	69	parse_rtattr(tb, FRA_MAX, RTM_RTA(r), len);
aba5acdf	70
f3a2ddc1	71	host_len = af_bit_len(r->rtm_family);
aba5acdf	72
98bde989 TG	73	if (n->nlmsg_type == RTM_DELRULE)
	74	fprintf(fp, "Deleted ");
	75
ad1a12db	76	if (tb[FRA_PRIORITY])
56f5daac	77	fprintf(fp, "%u:\t", (unsigned )RTA_DATA(tb[FRA_PRIORITY]));
aba5acdf SH	78	else
	79	fprintf(fp, "0:\t");
	80
3123a0cc TG	81	if (r->rtm_flags & FIB_RULE_INVERT)
	82	fprintf(fp, "not ");
	83
ad1a12db	84	if (tb[FRA_SRC]) {
aba5acdf	85	if (r->rtm_src_len != host_len) {
7faf1588 PS	86	fprintf(fp, "from %s/%u ",
	87	rt_addr_n2a_rta(r->rtm_family, tb[FRA_SRC]),
	88	r->rtm_src_len);
aba5acdf	89	} else {
d49f934c PS	90	fprintf(fp, "from %s ",
d49f934c PS	91	format_host_rta(r->rtm_family, tb[FRA_SRC]));
aba5acdf SH	92	}
	93	} else if (r->rtm_src_len) {
	94	fprintf(fp, "from 0/%d ", r->rtm_src_len);
	95	} else {
	96	fprintf(fp, "from all ");
	97	}
	98
ad1a12db	99	if (tb[FRA_DST]) {
aba5acdf	100	if (r->rtm_dst_len != host_len) {
7faf1588 PS	101	fprintf(fp, "to %s/%u ",
	102	rt_addr_n2a_rta(r->rtm_family, tb[FRA_DST]),
	103	r->rtm_dst_len);
aba5acdf	104	} else {
d49f934c PS	105	fprintf(fp, "to %s ",
d49f934c PS	106	format_host_rta(r->rtm_family, tb[FRA_DST]));
aba5acdf SH	107	}
	108	} else if (r->rtm_dst_len) {
	109	fprintf(fp, "to 0/%d ", r->rtm_dst_len);
	110	}
	111
	112	if (r->rtm_tos) {
	113	SPRINT_BUF(b1);
	114	fprintf(fp, "tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
	115	}
ad1a12db	116
4806867a	117	if (tb[FRA_FWMARK] \|\| tb[FRA_FWMASK]) {
be7f286e PM	118	__u32 mark = 0, mask = 0;
be7f286e PM	119
ad1a12db	120	if (tb[FRA_FWMARK])
ff24746c	121	mark = rta_getattr_u32(tb[FRA_FWMARK]);
be7f286e	122
ad1a12db	123	if (tb[FRA_FWMASK] &&
ff24746c	124	(mask = rta_getattr_u32(tb[FRA_FWMASK])) != 0xFFFFFFFF)
be7f286e	125	fprintf(fp, "fwmark 0x%x/0x%x ", mark, mask);
81c61790	126	else
be7f286e	127	fprintf(fp, "fwmark 0x%x ", mark);
aba5acdf SH	128	}
aba5acdf SH	129
ad1a12db	130	if (tb[FRA_IFNAME]) {
ff24746c	131	fprintf(fp, "iif %s ", rta_getattr_str(tb[FRA_IFNAME]));
85eae222 PM	132	if (r->rtm_flags & FIB_RULE_IIF_DETACHED)
	133	fprintf(fp, "[detached] ");
	134	}
	135
	136	if (tb[FRA_OIFNAME]) {
ff24746c	137	fprintf(fp, "oif %s ", rta_getattr_str(tb[FRA_OIFNAME]));
85eae222	138	if (r->rtm_flags & FIB_RULE_OIF_DETACHED)
6b469cae	139	fprintf(fp, "[detached] ");
aba5acdf SH	140	}
aba5acdf SH	141
34e95647	142	table = rtm_get_table(r, tb);
b1d0525f	143	if (table) {
34e95647	144	fprintf(fp, "lookup %s ", rtnl_rttable_n2a(table, b1, sizeof(b1)));
aba5acdf	145
b1d0525f ST	146	if (tb[FRA_SUPPRESS_PREFIXLEN]) {
b1d0525f ST	147	int pl = rta_getattr_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
56f5daac	148
b1d0525f ST	149	if (pl != -1) {
	150	fprintf(fp, "suppress_prefixlength %d ", pl);
	151	}
	152	}
	153	if (tb[FRA_SUPPRESS_IFGROUP]) {
	154	int group = rta_getattr_u32(tb[FRA_SUPPRESS_IFGROUP]);
56f5daac	155
b1d0525f ST	156	if (group != -1) {
	157	SPRINT_BUF(b1);
	158	fprintf(fp, "suppress_ifgroup %s ", rtnl_group_n2a(group, b1, sizeof(b1)));
	159	}
	160	}
	161	}
	162
ad1a12db	163	if (tb[FRA_FLOW]) {
ff24746c	164	__u32 to = rta_getattr_u32(tb[FRA_FLOW]);
aba5acdf	165	__u32 from = to>>16;
56f5daac	166
aba5acdf SH	167	to &= 0xFFFF;
	168	if (from) {
	169	fprintf(fp, "realms %s/",
	170	rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
	171	}
	172	fprintf(fp, "%s ",
	173	rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
	174	}
	175
	176	if (r->rtm_type == RTN_NAT) {
	177	if (tb[RTA_GATEWAY]) {
ae665a52	178	fprintf(fp, "map-to %s ",
d49f934c PS	179	format_host_rta(r->rtm_family,
d49f934c PS	180	tb[RTA_GATEWAY]));
aba5acdf SH	181	} else
aba5acdf SH	182	fprintf(fp, "masquerade");
6b469cae TG	183	} else if (r->rtm_type == FR_ACT_GOTO) {
	184	fprintf(fp, "goto ");
	185	if (tb[FRA_GOTO])
ff24746c	186	fprintf(fp, "%u", rta_getattr_u32(tb[FRA_GOTO]));
6b469cae TG	187	else
	188	fprintf(fp, "none");
	189	if (r->rtm_flags & FIB_RULE_UNRESOLVED)
	190	fprintf(fp, " [unresolved]");
	191	} else if (r->rtm_type == FR_ACT_NOP)
	192	fprintf(fp, "nop");
	193	else if (r->rtm_type != RTN_UNICAST)
aba5acdf SH	194	fprintf(fp, "%s", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
	195
	196	fprintf(fp, "\n");
	197	fflush(fp);
	198	return 0;
	199	}
	200
2f4e171f KT	201	static __u32 rule_dump_magic = 0x71706986;
	202
	203	static int save_rule_prep(void)
	204	{
	205	int ret;
	206
	207	if (isatty(STDOUT_FILENO)) {
	208	fprintf(stderr, "Not sending a binary stream to stdout\n");
	209	return -1;
	210	}
	211
	212	ret = write(STDOUT_FILENO, &rule_dump_magic, sizeof(rule_dump_magic));
	213	if (ret != sizeof(rule_dump_magic)) {
	214	fprintf(stderr, "Can't write magic to dump file\n");
	215	return -1;
	216	}
	217
	218	return 0;
	219	}
	220
	221	static int save_rule(const struct sockaddr_nl who, struct nlmsghdr n, void *arg)
aba5acdf	222	{
2f4e171f KT	223	int ret;
	224
	225	ret = write(STDOUT_FILENO, n, n->nlmsg_len);
	226	if ((ret > 0) && (ret != n->nlmsg_len)) {
	227	fprintf(stderr, "Short write while saving nlmsg\n");
	228	ret = -EIO;
	229	}
	230
	231	return ret == n->nlmsg_len ? 0 : ret;
	232	}
	233
	234	static int iprule_list_or_save(int argc, char **argv, int save)
	235	{
	236	rtnl_filter_t filter = print_rule;
aba5acdf SH	237	int af = preferred_family;
	238
	239	if (af == AF_UNSPEC)
	240	af = AF_INET;
	241
	242	if (argc > 0) {
2f4e171f KT	243	fprintf(stderr, "\"ip rule %s\" does not take any arguments.\n",
2f4e171f KT	244	save ? "save" : "show");
aba5acdf SH	245	return -1;
	246	}
	247
2f4e171f KT	248	if (save) {
	249	if (save_rule_prep())
	250	return -1;
	251	filter = save_rule;
	252	}
	253
aba5acdf SH	254	if (rtnl_wilddump_request(&rth, af, RTM_GETRULE) < 0) {
	255	perror("Cannot send dump request");
	256	return 1;
	257	}
	258
2f4e171f	259	if (rtnl_dump_filter(&rth, filter, stdout) < 0) {
aba5acdf SH	260	fprintf(stderr, "Dump terminated\n");
	261	return 1;
	262	}
	263
	264	return 0;
	265	}
	266
2f4e171f KT	267	static int rule_dump_check_magic(void)
	268	{
	269	int ret;
	270	__u32 magic = 0;
	271
	272	if (isatty(STDIN_FILENO)) {
	273	fprintf(stderr, "Can't restore rule dump from a terminal\n");
	274	return -1;
	275	}
	276
	277	ret = fread(&magic, sizeof(magic), 1, stdin);
	278	if (magic != rule_dump_magic) {
	279	fprintf(stderr, "Magic mismatch (%d elems, %x magic)\n", ret, magic);
	280	return -1;
	281	}
	282
	283	return 0;
	284	}
	285
	286	static int restore_handler(const struct sockaddr_nl *nl,
	287	struct rtnl_ctrl_data *ctrl,
	288	struct nlmsghdr n, void arg)
	289	{
	290	int ret;
	291
	292	n->nlmsg_flags \|= NLM_F_REQUEST \| NLM_F_CREATE \| NLM_F_ACK;
	293
	294	ll_init_map(&rth);
	295
	296	ret = rtnl_talk(&rth, n, n, sizeof(*n));
	297	if ((ret < 0) && (errno == EEXIST))
	298	ret = 0;
	299
	300	return ret;
	301	}
	302
	303
	304	static int iprule_restore(void)
	305	{
	306	if (rule_dump_check_magic())
	307	exit(-1);
	308
	309	exit(rtnl_from_file(stdin, &restore_handler, NULL));
	310	}
aba5acdf	311
50772dc5	312	static int iprule_modify(int cmd, int argc, char **argv)
aba5acdf SH	313	{
aba5acdf SH	314	int table_ok = 0;
aba5acdf	315	struct {
4806867a SH	316	struct nlmsghdr n;
4806867a SH	317	struct rtmsg r;
56f5daac	318	char buf[1024];
aba5acdf SH	319	} req;
	320
	321	memset(&req, 0, sizeof(req));
	322
	323	req.n.nlmsg_type = cmd;
	324	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
	325	req.n.nlmsg_flags = NLM_F_REQUEST;
	326	req.r.rtm_family = preferred_family;
	327	req.r.rtm_protocol = RTPROT_BOOT;
	328	req.r.rtm_scope = RT_SCOPE_UNIVERSE;
	329	req.r.rtm_table = 0;
	330	req.r.rtm_type = RTN_UNSPEC;
3123a0cc	331	req.r.rtm_flags = 0;
aba5acdf SH	332
	333	if (cmd == RTM_NEWRULE) {
	334	req.n.nlmsg_flags \|= NLM_F_CREATE\|NLM_F_EXCL;
	335	req.r.rtm_type = RTN_UNICAST;
	336	}
	337
	338	while (argc > 0) {
3123a0cc TG	339	if (strcmp(*argv, "not") == 0) {
	340	req.r.rtm_flags \|= FIB_RULE_INVERT;
	341	} else if (strcmp(*argv, "from") == 0) {
aba5acdf	342	inet_prefix dst;
56f5daac	343
aba5acdf SH	344	NEXT_ARG();
	345	get_prefix(&dst, *argv, req.r.rtm_family);
	346	req.r.rtm_src_len = dst.bitlen;
ad1a12db	347	addattr_l(&req.n, sizeof(req), FRA_SRC, &dst.data, dst.bytelen);
aba5acdf SH	348	} else if (strcmp(*argv, "to") == 0) {
aba5acdf SH	349	inet_prefix dst;
56f5daac	350
aba5acdf SH	351	NEXT_ARG();
	352	get_prefix(&dst, *argv, req.r.rtm_family);
	353	req.r.rtm_dst_len = dst.bitlen;
ad1a12db	354	addattr_l(&req.n, sizeof(req), FRA_DST, &dst.data, dst.bytelen);
aba5acdf SH	355	} else if (matches(*argv, "preference") == 0 \|\|
	356	matches(*argv, "order") == 0 \|\|
	357	matches(*argv, "priority") == 0) {
	358	__u32 pref;
56f5daac	359
aba5acdf SH	360	NEXT_ARG();
	361	if (get_u32(&pref, *argv, 0))
	362	invarg("preference value is invalid\n", *argv);
ad1a12db	363	addattr32(&req.n, sizeof(req), FRA_PRIORITY, pref);
dec01609 AH	364	} else if (strcmp(*argv, "tos") == 0 \|\|
dec01609 AH	365	matches(*argv, "dsfield") == 0) {
aba5acdf	366	__u32 tos;
56f5daac	367
aba5acdf SH	368	NEXT_ARG();
	369	if (rtnl_dsfield_a2n(&tos, *argv))
	370	invarg("TOS value is invalid\n", *argv);
	371	req.r.rtm_tos = tos;
	372	} else if (strcmp(*argv, "fwmark") == 0) {
be7f286e PM	373	char *slash;
be7f286e PM	374	__u32 fwmark, fwmask;
56f5daac	375
aba5acdf	376	NEXT_ARG();
be7f286e PM	377	if ((slash = strchr(*argv, '/')) != NULL)
be7f286e PM	378	*slash = '\0';
4fb466f9	379	if (get_u32(&fwmark, *argv, 0))
aba5acdf	380	invarg("fwmark value is invalid\n", *argv);
ad1a12db	381	addattr32(&req.n, sizeof(req), FRA_FWMARK, fwmark);
be7f286e PM	382	if (slash) {
	383	if (get_u32(&fwmask, slash+1, 0))
	384	invarg("fwmask value is invalid\n", slash+1);
ad1a12db	385	addattr32(&req.n, sizeof(req), FRA_FWMASK, fwmask);
be7f286e	386	}
aba5acdf SH	387	} else if (matches(*argv, "realms") == 0) {
aba5acdf SH	388	__u32 realm;
56f5daac	389
aba5acdf	390	NEXT_ARG();
d583e88e	391	if (get_rt_realms_or_raw(&realm, *argv))
aba5acdf	392	invarg("invalid realms\n", *argv);
ad1a12db	393	addattr32(&req.n, sizeof(req), FRA_FLOW, realm);
aba5acdf SH	394	} else if (matches(*argv, "table") == 0 \|\|
aba5acdf SH	395	strcmp(*argv, "lookup") == 0) {
f332d169	396	__u32 tid;
56f5daac	397
aba5acdf SH	398	NEXT_ARG();
	399	if (rtnl_rttable_a2n(&tid, *argv))
	400	invarg("invalid table ID\n", *argv);
34e95647 PM	401	if (tid < 256)
	402	req.r.rtm_table = tid;
	403	else {
	404	req.r.rtm_table = RT_TABLE_UNSPEC;
ad1a12db	405	addattr32(&req.n, sizeof(req), FRA_TABLE, tid);
34e95647	406	}
aba5acdf	407	table_ok = 1;
b1d0525f ST	408	} else if (matches(*argv, "suppress_prefixlength") == 0 \|\|
	409	strcmp(*argv, "sup_pl") == 0) {
	410	int pl;
56f5daac	411
b1d0525f ST	412	NEXT_ARG();
	413	if (get_s32(&pl, *argv, 0) \|\| pl < 0)
	414	invarg("suppress_prefixlength value is invalid\n", *argv);
	415	addattr32(&req.n, sizeof(req), FRA_SUPPRESS_PREFIXLEN, pl);
	416	} else if (matches(*argv, "suppress_ifgroup") == 0 \|\|
	417	strcmp(*argv, "sup_group") == 0) {
	418	NEXT_ARG();
	419	int group;
56f5daac	420
b1d0525f ST	421	if (rtnl_group_a2n(&group, *argv))
	422	invarg("Invalid \"suppress_ifgroup\" value\n", *argv);
	423	addattr32(&req.n, sizeof(req), FRA_SUPPRESS_IFGROUP, group);
aba5acdf SH	424	} else if (strcmp(*argv, "dev") == 0 \|\|
	425	strcmp(*argv, "iif") == 0) {
	426	NEXT_ARG();
ad1a12db	427	addattr_l(&req.n, sizeof(req), FRA_IFNAME, argv, strlen(argv)+1);
85eae222 PM	428	} else if (strcmp(*argv, "oif") == 0) {
	429	NEXT_ARG();
	430	addattr_l(&req.n, sizeof(req), FRA_OIFNAME, argv, strlen(argv)+1);
aba5acdf SH	431	} else if (strcmp(*argv, "nat") == 0 \|\|
	432	matches(*argv, "map-to") == 0) {
	433	NEXT_ARG();
526afe40	434	fprintf(stderr, "Warning: route NAT is deprecated\n");
aba5acdf SH	435	addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv));
	436	req.r.rtm_type = RTN_NAT;
	437	} else {
	438	int type;
	439
	440	if (strcmp(*argv, "type") == 0) {
	441	NEXT_ARG();
	442	}
	443	if (matches(*argv, "help") == 0)
	444	usage();
6b469cae TG	445	else if (matches(*argv, "goto") == 0) {
6b469cae TG	446	__u32 target;
56f5daac	447
6b469cae TG	448	type = FR_ACT_GOTO;
	449	NEXT_ARG();
	450	if (get_u32(&target, *argv, 0))
	451	invarg("invalid target\n", *argv);
	452	addattr32(&req.n, sizeof(req), FRA_GOTO, target);
	453	} else if (matches(*argv, "nop") == 0)
	454	type = FR_ACT_NOP;
	455	else if (rtnl_rtntype_a2n(&type, *argv))
aba5acdf SH	456	invarg("Failed to parse rule type", *argv);
aba5acdf SH	457	req.r.rtm_type = type;
6b469cae	458	table_ok = 1;
aba5acdf SH	459	}
	460	argc--;
	461	argv++;
	462	}
	463
	464	if (req.r.rtm_family == AF_UNSPEC)
	465	req.r.rtm_family = AF_INET;
	466
	467	if (!table_ok && cmd == RTM_NEWRULE)
	468	req.r.rtm_table = RT_TABLE_MAIN;
	469
c079e121	470	if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
076ae708	471	return -2;
aba5acdf SH	472
	473	return 0;
	474	}
	475
50772dc5 SH	476
	477	static int flush_rule(const struct sockaddr_nl who, struct nlmsghdr n, void *arg)
	478	{
b77caeba	479	struct rtnl_handle rth2;
50772dc5 SH	480	struct rtmsg *r = NLMSG_DATA(n);
50772dc5 SH	481	int len = n->nlmsg_len;
56f5daac	482	struct rtattr *tb[FRA_MAX+1];
50772dc5 SH	483
	484	len -= NLMSG_LENGTH(sizeof(*r));
	485	if (len < 0)
	486	return -1;
	487
ad1a12db	488	parse_rtattr(tb, FRA_MAX, RTM_RTA(r), len);
50772dc5	489
ad1a12db	490	if (tb[FRA_PRIORITY]) {
50772dc5 SH	491	n->nlmsg_type = RTM_DELRULE;
	492	n->nlmsg_flags = NLM_F_REQUEST;
	493
b77caeba SH	494	if (rtnl_open(&rth2, 0) < 0)
	495	return -1;
	496
c079e121	497	if (rtnl_talk(&rth2, n, NULL, 0) < 0)
50772dc5	498	return -2;
b77caeba SH	499
b77caeba SH	500	rtnl_close(&rth2);
50772dc5 SH	501	}
	502
	503	return 0;
	504	}
	505
	506	static int iprule_flush(int argc, char **argv)
	507	{
50772dc5 SH	508	int af = preferred_family;
	509
	510	if (af == AF_UNSPEC)
	511	af = AF_INET;
	512
	513	if (argc > 0) {
66081849	514	fprintf(stderr, "\"ip rule flush\" does not allow arguments\n");
50772dc5 SH	515	return -1;
	516	}
	517
50772dc5 SH	518	if (rtnl_wilddump_request(&rth, af, RTM_GETRULE) < 0) {
	519	perror("Cannot send dump request");
	520	return 1;
	521	}
	522
cd70f3f5	523	if (rtnl_dump_filter(&rth, flush_rule, NULL) < 0) {
50772dc5 SH	524	fprintf(stderr, "Flush terminated\n");
	525	return 1;
	526	}
	527
	528	return 0;
	529	}
	530
aba5acdf SH	531	int do_iprule(int argc, char **argv)
	532	{
	533	if (argc < 1) {
2f4e171f	534	return iprule_list_or_save(0, NULL, 0);
aba5acdf SH	535	} else if (matches(argv[0], "list") == 0 \|\|
	536	matches(argv[0], "lst") == 0 \|\|
	537	matches(argv[0], "show") == 0) {
2f4e171f KT	538	return iprule_list_or_save(argc-1, argv+1, 0);
	539	} else if (matches(argv[0], "save") == 0) {
	540	return iprule_list_or_save(argc-1, argv+1, 1);
	541	} else if (matches(argv[0], "restore") == 0) {
	542	return iprule_restore();
aba5acdf SH	543	} else if (matches(argv[0], "add") == 0) {
	544	return iprule_modify(RTM_NEWRULE, argc-1, argv+1);
	545	} else if (matches(argv[0], "delete") == 0) {
	546	return iprule_modify(RTM_DELRULE, argc-1, argv+1);
50772dc5 SH	547	} else if (matches(argv[0], "flush") == 0) {
50772dc5 SH	548	return iprule_flush(argc-1, argv+1);
aba5acdf SH	549	} else if (matches(argv[0], "help") == 0)
	550	usage();
	551
	552	fprintf(stderr, "Command \"%s\" is unknown, try \"ip rule help\".\n", *argv);
	553	exit(-1);
	554	}
	555
b6c8e808 PM	556	int do_multirule(int argc, char **argv)
	557	{
	558	switch (preferred_family) {
	559	case AF_UNSPEC:
	560	case AF_INET:
	561	preferred_family = RTNL_FAMILY_IPMR;
	562	break;
	563	case AF_INET6:
	564	preferred_family = RTNL_FAMILY_IP6MR;
	565	break;
0d1c9b57 BG	566	case RTNL_FAMILY_IPMR:
	567	case RTNL_FAMILY_IP6MR:
	568	break;
b6c8e808	569	default:
0d1c9b57 BG	570	fprintf(stderr, "Multicast rules are only supported for IPv4/IPv6, was: %i\n",
0d1c9b57 BG	571	preferred_family);
b6c8e808 PM	572	exit(-1);
	573	}
	574
	575	return do_iprule(argc, argv);
	576	}