networking/libiproute/iprule.c - busybox - Git at Google

 /* vi: set sw=4 ts=4: */
 /*
  * 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>
  *
  * Changes:
  *
  * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
  * initially integrated into busybox by Bernhard Reutner-Fischer
  */

 #include <netinet/in.h>
 #include <netinet/ip.h>
 #include <arpa/inet.h>

 #include "ip_common.h"  /* #include "libbb.h" is inside */
 #include "rt_names.h"
 #include "utils.h"

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

 static void usage(void)
 {
 	fprintf(stderr, "Usage: ip rule [ list | add | del ] SELECTOR ACTION\n");
 	fprintf(stderr, "SELECTOR := [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK ]\n");
 	fprintf(stderr, "            [ dev STRING ] [ pref NUMBER ]\n");
 	fprintf(stderr, "ACTION := [ table TABLE_ID ] [ nat ADDRESS ]\n");
 	fprintf(stderr, "          [ prohibit | reject | unreachable ]\n");
 	fprintf(stderr, "          [ realms [SRCREALM/]DSTREALM ]\n");
 	fprintf(stderr, "TABLE_ID := [ local | main | default | NUMBER ]\n");
 	exit(-1);
 }
 */

 static int FAST_FUNC print_rule(const struct sockaddr_nl *who UNUSED_PARAM,
 					struct nlmsghdr *n, void *arg UNUSED_PARAM)
 {
 	struct rtmsg *r = NLMSG_DATA(n);
 	int len = n->nlmsg_len;
 	int host_len = -1;
 	struct rtattr * tb[RTA_MAX+1];

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

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

 	memset(tb, 0, sizeof(tb));
 	parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);

 	if (r->rtm_family == AF_INET)
 		host_len = 32;
 	else if (r->rtm_family == AF_INET6)
 		host_len = 128;
 /*	else if (r->rtm_family == AF_DECnet)
 		host_len = 16;
 	else if (r->rtm_family == AF_IPX)
 		host_len = 80;
 */
 	printf("%u:\t", tb[RTA_PRIORITY] ?
 					*(unsigned*)RTA_DATA(tb[RTA_PRIORITY])
 					: 0);
 	printf("from ");
 	if (tb[RTA_SRC]) {
 		if (r->rtm_src_len != host_len) {
 			printf("%s/%u",
 				rt_addr_n2a(r->rtm_family, RTA_DATA(tb[RTA_SRC])),
 				r->rtm_src_len
 			);
 		} else {
 			fputs(format_host(r->rtm_family,
 						RTA_PAYLOAD(tb[RTA_SRC]),
 						RTA_DATA(tb[RTA_SRC])),
 				stdout
 			);
 		}
 	} else if (r->rtm_src_len) {
 		printf("0/%d", r->rtm_src_len);
 	} else {
 		printf("all");
 	}
 	bb_putchar(' ');

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

 	if (r->rtm_tos) {
 		printf("tos %s ", rtnl_dsfield_n2a(r->rtm_tos));
 	}
 	if (tb[RTA_PROTOINFO]) {
 		printf("fwmark %#x ", *(uint32_t*)RTA_DATA(tb[RTA_PROTOINFO]));
 	}

 	if (tb[RTA_IIF]) {
 		printf("iif %s ", (char*)RTA_DATA(tb[RTA_IIF]));
 	}

 	if (tb[RTA_TABLE])
 		printf("lookup %s ", rtnl_rttable_n2a(*(uint32_t*)RTA_DATA(tb[RTA_TABLE])));
 	else if (r->rtm_table)
 		printf("lookup %s ", rtnl_rttable_n2a(r->rtm_table));

 	if (tb[RTA_FLOW]) {
 		uint32_t to = *(uint32_t*)RTA_DATA(tb[RTA_FLOW]);
 		uint32_t from = to>>16;
 		to &= 0xFFFF;
 		if (from) {
 			printf("realms %s/",
 				rtnl_rtrealm_n2a(from));
 		}
 		printf("%s ",
 			rtnl_rtrealm_n2a(to));
 	}

 	if (r->rtm_type == RTN_NAT) {
 		if (tb[RTA_GATEWAY]) {
 			printf("map-to %s ",
 				format_host(r->rtm_family,
 					    RTA_PAYLOAD(tb[RTA_GATEWAY]),
 					    RTA_DATA(tb[RTA_GATEWAY]))
 			);
 		} else
 			printf("masquerade");
 	} else if (r->rtm_type != RTN_UNICAST)
 		fputs(rtnl_rtntype_n2a(r->rtm_type), stdout);

 	bb_putchar('\n');
 	/*fflush_all();*/
 	return 0;
 }

 /* Return value becomes exitcode. It's okay to not return at all */
 static int iprule_list(char **argv)
 {
 	struct rtnl_handle rth;
 	int af = preferred_family;

 	if (af == AF_UNSPEC)
 		af = AF_INET;

 	if (*argv) {
 		//bb_error_msg("\"rule show\" needs no arguments");
 		bb_warn_ignoring_args(*argv);
 		return -1;
 	}

 	xrtnl_open(&rth);

 	xrtnl_wilddump_request(&rth, af, RTM_GETRULE);
 	xrtnl_dump_filter(&rth, print_rule, NULL);

 	return 0;
 }

 /* Return value becomes exitcode. It's okay to not return at all */
 static int iprule_modify(int cmd, char **argv)
 {
 	static const char keywords[] ALIGN1 =
 		"from\0""to\0""preference\0""order\0""priority\0"
 		"tos\0""fwmark\0""realms\0""table\0""lookup\0""dev\0"
 		"iif\0""nat\0""map-to\0""type\0""help\0";
 	enum {
 		ARG_from = 1, ARG_to, ARG_preference, ARG_order, ARG_priority,
 		ARG_tos, ARG_fwmark, ARG_realms, ARG_table, ARG_lookup, ARG_dev,
 		ARG_iif, ARG_nat, ARG_map_to, ARG_type, ARG_help
 	};
 	bool table_ok = 0;
 	struct rtnl_handle rth;
 	struct {
 		struct nlmsghdr n;
 		struct rtmsg    r;
 		char            buf[1024];
 	} req;
 	smalluint key;

 	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;
 	if (RT_SCOPE_UNIVERSE != 0)
 		req.r.rtm_scope = RT_SCOPE_UNIVERSE;
 	/*req.r.rtm_table = 0; - already is */
 	if (RTN_UNSPEC != 0)
 		req.r.rtm_type = RTN_UNSPEC;

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

 	while (*argv) {
 		key = index_in_substrings(keywords, *argv) + 1;
 		if (key == 0) /* no match found in keywords array, bail out. */
 			invarg_1_to_2(*argv, applet_name);
 		if (key == ARG_from) {
 			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), RTA_SRC, &dst.data, dst.bytelen);
 		} else if (key == ARG_to) {
 			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), RTA_DST, &dst.data, dst.bytelen);
 		} else if (key == ARG_preference ||
 			   key == ARG_order ||
 			   key == ARG_priority
 		) {
 			uint32_t pref;
 			NEXT_ARG();
 			pref = get_u32(*argv, "preference");
 			addattr32(&req.n, sizeof(req), RTA_PRIORITY, pref);
 		} else if (key == ARG_tos) {
 			uint32_t tos;
 			NEXT_ARG();
 			if (rtnl_dsfield_a2n(&tos, *argv))
 				invarg_1_to_2(*argv, "TOS");
 			req.r.rtm_tos = tos;
 		} else if (key == ARG_fwmark) {
 			uint32_t fwmark;
 			NEXT_ARG();
 			fwmark = get_u32(*argv, "fwmark");
 			addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark);
 		} else if (key == ARG_realms) {
 			uint32_t realm;
 			NEXT_ARG();
 			if (get_rt_realms(&realm, *argv))
 				invarg_1_to_2(*argv, "realms");
 			addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
 		} else if (key == ARG_table ||
 			   key == ARG_lookup
 		) {
 			uint32_t tid;
 			NEXT_ARG();
 			if (rtnl_rttable_a2n(&tid, *argv))
 				invarg_1_to_2(*argv, "table ID");
 			if (tid < 256)
 				req.r.rtm_table = tid;
 			else {
 				req.r.rtm_table = RT_TABLE_UNSPEC;
 				addattr32(&req.n, sizeof(req), RTA_TABLE, tid);
 			}
 			table_ok = 1;
 		} else if (key == ARG_dev ||
 			   key == ARG_iif
 		) {
 			NEXT_ARG();
 			addattr_l(&req.n, sizeof(req), RTA_IIF, *argv, strlen(*argv)+1);
 		} else if (key == ARG_nat ||
 			   key == ARG_map_to
 		) {
 			NEXT_ARG();
 			addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv));
 			req.r.rtm_type = RTN_NAT;
 		} else {
 			int type;

 			if (key == ARG_type) {
 				NEXT_ARG();
 			}
 			if (key == ARG_help)
 				bb_show_usage();
 			if (rtnl_rtntype_a2n(&type, *argv))
 				invarg_1_to_2(*argv, "type");
 			req.r.rtm_type = type;
 		}
 		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;

 	xrtnl_open(&rth);

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

 	return 0;
 }

 /* Return value becomes exitcode. It's okay to not return at all */
 int FAST_FUNC do_iprule(char **argv)
 {
 	static const char ip_rule_commands[] ALIGN1 =
 		"add\0""delete\0""list\0""show\0";
 	if (*argv) {
 		int cmd = index_in_substrings(ip_rule_commands, *argv);
 		if (cmd < 0)
 			invarg_1_to_2(*argv, applet_name);
 		argv++;
 		if (cmd < 2)
 			return iprule_modify((cmd == 0) ? RTM_NEWRULE : RTM_DELRULE, argv);
 	}
 	return iprule_list(argv);
 }
	/* vi: set sw=4 ts=4: */
	/*
	* 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>
	*
	* Changes:
	*
	* Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
	* initially integrated into busybox by Bernhard Reutner-Fischer
	*/

	#include <netinet/in.h>
	#include <netinet/ip.h>
	#include <arpa/inet.h>

	#include "ip_common.h" /* #include "libbb.h" is inside */
	#include "rt_names.h"
	#include "utils.h"

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

	static void usage(void)
	{
	fprintf(stderr, "Usage: ip rule [ list \| add \| del ] SELECTOR ACTION\n");
	fprintf(stderr, "SELECTOR := [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK ]\n");
	fprintf(stderr, " [ dev STRING ] [ pref NUMBER ]\n");
	fprintf(stderr, "ACTION := [ table TABLE_ID ] [ nat ADDRESS ]\n");
	fprintf(stderr, " [ prohibit \| reject \| unreachable ]\n");
	fprintf(stderr, " [ realms [SRCREALM/]DSTREALM ]\n");
	fprintf(stderr, "TABLE_ID := [ local \| main \| default \| NUMBER ]\n");
	exit(-1);
	}
	*/

	static int FAST_FUNC print_rule(const struct sockaddr_nl *who UNUSED_PARAM,
	struct nlmsghdr n, void arg UNUSED_PARAM)
	{
	struct rtmsg *r = NLMSG_DATA(n);
	int len = n->nlmsg_len;
	int host_len = -1;
	struct rtattr * tb[RTA_MAX+1];

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

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

	memset(tb, 0, sizeof(tb));
	parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);

	if (r->rtm_family == AF_INET)
	host_len = 32;
	else if (r->rtm_family == AF_INET6)
	host_len = 128;
	/* else if (r->rtm_family == AF_DECnet)
	host_len = 16;
	else if (r->rtm_family == AF_IPX)
	host_len = 80;
	*/
	printf("%u:\t", tb[RTA_PRIORITY] ?
	(unsigned)RTA_DATA(tb[RTA_PRIORITY])
	: 0);
	printf("from ");
	if (tb[RTA_SRC]) {
	if (r->rtm_src_len != host_len) {
	printf("%s/%u",
	rt_addr_n2a(r->rtm_family, RTA_DATA(tb[RTA_SRC])),
	r->rtm_src_len
	);
	} else {
	fputs(format_host(r->rtm_family,
	RTA_PAYLOAD(tb[RTA_SRC]),
	RTA_DATA(tb[RTA_SRC])),
	stdout
	);
	}
	} else if (r->rtm_src_len) {
	printf("0/%d", r->rtm_src_len);
	} else {
	printf("all");
	}
	bb_putchar(' ');

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

	if (r->rtm_tos) {
	printf("tos %s ", rtnl_dsfield_n2a(r->rtm_tos));
	}
	if (tb[RTA_PROTOINFO]) {
	printf("fwmark %#x ", (uint32_t)RTA_DATA(tb[RTA_PROTOINFO]));
	}

	if (tb[RTA_IIF]) {
	printf("iif %s ", (char*)RTA_DATA(tb[RTA_IIF]));
	}

	if (tb[RTA_TABLE])
	printf("lookup %s ", rtnl_rttable_n2a((uint32_t)RTA_DATA(tb[RTA_TABLE])));
	else if (r->rtm_table)
	printf("lookup %s ", rtnl_rttable_n2a(r->rtm_table));

	if (tb[RTA_FLOW]) {
	uint32_t to = (uint32_t)RTA_DATA(tb[RTA_FLOW]);
	uint32_t from = to>>16;
	to &= 0xFFFF;
	if (from) {
	printf("realms %s/",
	rtnl_rtrealm_n2a(from));
	}
	printf("%s ",
	rtnl_rtrealm_n2a(to));
	}

	if (r->rtm_type == RTN_NAT) {
	if (tb[RTA_GATEWAY]) {
	printf("map-to %s ",
	format_host(r->rtm_family,
	RTA_PAYLOAD(tb[RTA_GATEWAY]),
	RTA_DATA(tb[RTA_GATEWAY]))
	);
	} else
	printf("masquerade");
	} else if (r->rtm_type != RTN_UNICAST)
	fputs(rtnl_rtntype_n2a(r->rtm_type), stdout);

	bb_putchar('\n');
	/fflush_all();/
	return 0;
	}

	/* Return value becomes exitcode. It's okay to not return at all */
	static int iprule_list(char **argv)
	{
	struct rtnl_handle rth;
	int af = preferred_family;

	if (af == AF_UNSPEC)
	af = AF_INET;

	if (*argv) {
	//bb_error_msg("\"rule show\" needs no arguments");
	bb_warn_ignoring_args(*argv);
	return -1;
	}

	xrtnl_open(&rth);

	xrtnl_wilddump_request(&rth, af, RTM_GETRULE);
	xrtnl_dump_filter(&rth, print_rule, NULL);

	return 0;
	}

	/* Return value becomes exitcode. It's okay to not return at all */
	static int iprule_modify(int cmd, char **argv)
	{
	static const char keywords[] ALIGN1 =
	"from\0""to\0""preference\0""order\0""priority\0"
	"tos\0""fwmark\0""realms\0""table\0""lookup\0""dev\0"
	"iif\0""nat\0""map-to\0""type\0""help\0";
	enum {
	ARG_from = 1, ARG_to, ARG_preference, ARG_order, ARG_priority,
	ARG_tos, ARG_fwmark, ARG_realms, ARG_table, ARG_lookup, ARG_dev,
	ARG_iif, ARG_nat, ARG_map_to, ARG_type, ARG_help
	};
	bool table_ok = 0;
	struct rtnl_handle rth;
	struct {
	struct nlmsghdr n;
	struct rtmsg r;
	char buf[1024];
	} req;
	smalluint key;

	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;
	if (RT_SCOPE_UNIVERSE != 0)
	req.r.rtm_scope = RT_SCOPE_UNIVERSE;
	/req.r.rtm_table = 0; - already is /
	if (RTN_UNSPEC != 0)
	req.r.rtm_type = RTN_UNSPEC;

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

	while (*argv) {
	key = index_in_substrings(keywords, *argv) + 1;
	if (key == 0) /* no match found in keywords array, bail out. */
	invarg_1_to_2(*argv, applet_name);
	if (key == ARG_from) {
	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), RTA_SRC, &dst.data, dst.bytelen);
	} else if (key == ARG_to) {
	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), RTA_DST, &dst.data, dst.bytelen);
	} else if (key == ARG_preference \|\|
	key == ARG_order \|\|
	key == ARG_priority
	) {
	uint32_t pref;
	NEXT_ARG();
	pref = get_u32(*argv, "preference");
	addattr32(&req.n, sizeof(req), RTA_PRIORITY, pref);
	} else if (key == ARG_tos) {
	uint32_t tos;
	NEXT_ARG();
	if (rtnl_dsfield_a2n(&tos, *argv))
	invarg_1_to_2(*argv, "TOS");
	req.r.rtm_tos = tos;
	} else if (key == ARG_fwmark) {
	uint32_t fwmark;
	NEXT_ARG();
	fwmark = get_u32(*argv, "fwmark");
	addattr32(&req.n, sizeof(req), RTA_PROTOINFO, fwmark);
	} else if (key == ARG_realms) {
	uint32_t realm;
	NEXT_ARG();
	if (get_rt_realms(&realm, *argv))
	invarg_1_to_2(*argv, "realms");
	addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
	} else if (key == ARG_table \|\|
	key == ARG_lookup
	) {
	uint32_t tid;
	NEXT_ARG();
	if (rtnl_rttable_a2n(&tid, *argv))
	invarg_1_to_2(*argv, "table ID");
	if (tid < 256)
	req.r.rtm_table = tid;
	else {
	req.r.rtm_table = RT_TABLE_UNSPEC;
	addattr32(&req.n, sizeof(req), RTA_TABLE, tid);
	}
	table_ok = 1;
	} else if (key == ARG_dev \|\|
	key == ARG_iif
	) {
	NEXT_ARG();
	addattr_l(&req.n, sizeof(req), RTA_IIF, argv, strlen(argv)+1);
	} else if (key == ARG_nat \|\|
	key == ARG_map_to
	) {
	NEXT_ARG();
	addattr32(&req.n, sizeof(req), RTA_GATEWAY, get_addr32(*argv));
	req.r.rtm_type = RTN_NAT;
	} else {
	int type;

	if (key == ARG_type) {
	NEXT_ARG();
	}
	if (key == ARG_help)
	bb_show_usage();
	if (rtnl_rtntype_a2n(&type, *argv))
	invarg_1_to_2(*argv, "type");
	req.r.rtm_type = type;
	}
	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;

	xrtnl_open(&rth);

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

	return 0;
	}

	/* Return value becomes exitcode. It's okay to not return at all */
	int FAST_FUNC do_iprule(char **argv)
	{
	static const char ip_rule_commands[] ALIGN1 =
	"add\0""delete\0""list\0""show\0";
	if (*argv) {
	int cmd = index_in_substrings(ip_rule_commands, *argv);
	if (cmd < 0)
	invarg_1_to_2(*argv, applet_name);
	argv++;
	if (cmd < 2)
	return iprule_modify((cmd == 0) ? RTM_NEWRULE : RTM_DELRULE, argv);
	}
	return iprule_list(argv);
	}