Blame ip/iplink_bareudp.c

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/* SPDX-License-Identifier: GPL-2.0 */
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#include <stdio.h>
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#include <linux/if_ether.h>
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#include <linux/if_link.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include "libnetlink.h"
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#include "rt_names.h"
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#include "utils.h"
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#include "ip_common.h"
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#include "json_print.h"
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#define BAREUDP_ATTRSET(attrs, type) (((attrs) & (1L << (type))) != 0)
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static void print_explain(FILE *f)
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{
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	fprintf(f,
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		"Usage: ... bareudp dstport PORT\n"
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		"		ethertype PROTO\n"
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		"		[ srcportmin PORT ]\n"
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		"		[ [no]multiproto ]\n"
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		"\n"
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		"Where:	PORT       := 0-65535\n"
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		"	PROTO      := NUMBER | ip | mpls\n"
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		"	SRCPORTMIN := 0-65535\n"
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	);
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}
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static void explain(void)
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{
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	print_explain(stderr);
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}
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static void check_duparg(__u64 *attrs, int type, const char *key,
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			 const char *argv)
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{
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	if (!BAREUDP_ATTRSET(*attrs, type)) {
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		*attrs |= (1L << type);
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		return;
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	}
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	duparg2(key, argv);
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}
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static int bareudp_parse_opt(struct link_util *lu, int argc, char **argv,
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			     struct nlmsghdr *n)
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{
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	bool multiproto = false;
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	__u16 srcportmin = 0;
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	__be16 ethertype = 0;
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	__be16 dstport = 0;
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	__u64 attrs = 0;
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	while (argc > 0) {
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		if (matches(*argv, "dstport") == 0) {
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			NEXT_ARG();
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			check_duparg(&attrs, IFLA_BAREUDP_PORT, "dstport",
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				     *argv);
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			if (get_be16(&dstport, *argv, 0))
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				invarg("dstport", *argv);
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		} else if (matches(*argv, "ethertype") == 0)  {
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			NEXT_ARG();
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			check_duparg(&attrs, IFLA_BAREUDP_ETHERTYPE,
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				     "ethertype", *argv);
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			if (ll_proto_a2n(&ethertype, *argv))
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				invarg("ethertype", *argv);
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		} else if (matches(*argv, "srcportmin") == 0) {
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			NEXT_ARG();
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			check_duparg(&attrs, IFLA_BAREUDP_SRCPORT_MIN,
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				     "srcportmin", *argv);
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			if (get_u16(&srcportmin, *argv, 0))
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				invarg("srcportmin", *argv);
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		} else if (matches(*argv, "multiproto") == 0) {
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			check_duparg(&attrs, IFLA_BAREUDP_MULTIPROTO_MODE,
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				     *argv, *argv);
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			multiproto = true;
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		} else if (matches(*argv, "nomultiproto") == 0) {
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			check_duparg(&attrs, IFLA_BAREUDP_MULTIPROTO_MODE,
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				     *argv, *argv);
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			multiproto = false;
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		} else if (matches(*argv, "help") == 0) {
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			explain();
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			return -1;
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		} else {
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			fprintf(stderr, "bareudp: unknown command \"%s\"?\n",
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				*argv);
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			explain();
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			return -1;
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		}
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		argc--, argv++;
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	}
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	if (!BAREUDP_ATTRSET(attrs, IFLA_BAREUDP_PORT))
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		missarg("dstport");
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	if (!BAREUDP_ATTRSET(attrs, IFLA_BAREUDP_ETHERTYPE))
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		missarg("ethertype");
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	addattr16(n, 1024, IFLA_BAREUDP_PORT, dstport);
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	addattr16(n, 1024, IFLA_BAREUDP_ETHERTYPE, ethertype);
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	if (BAREUDP_ATTRSET(attrs, IFLA_BAREUDP_SRCPORT_MIN))
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		addattr16(n, 1024, IFLA_BAREUDP_SRCPORT_MIN, srcportmin);
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	if (multiproto)
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		addattr(n, 1024, IFLA_BAREUDP_MULTIPROTO_MODE);
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	return 0;
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}
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static void bareudp_print_opt(struct link_util *lu, FILE *f,
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			      struct rtattr *tb[])
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{
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	if (!tb)
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		return;
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	if (tb[IFLA_BAREUDP_PORT])
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		print_uint(PRINT_ANY, "dstport", "dstport %u ",
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			   rta_getattr_be16(tb[IFLA_BAREUDP_PORT]));
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	if (tb[IFLA_BAREUDP_ETHERTYPE]) {
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		struct rtattr *attr = tb[IFLA_BAREUDP_ETHERTYPE];
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		SPRINT_BUF(ethertype);
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		print_string(PRINT_ANY, "ethertype", "ethertype %s ",
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			     ll_proto_n2a(rta_getattr_u16(attr),
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					  ethertype, sizeof(ethertype)));
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	}
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	if (tb[IFLA_BAREUDP_SRCPORT_MIN])
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		print_uint(PRINT_ANY, "srcportmin", "srcportmin %u ",
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			   rta_getattr_u16(tb[IFLA_BAREUDP_SRCPORT_MIN]));
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	if (tb[IFLA_BAREUDP_MULTIPROTO_MODE])
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		print_bool(PRINT_ANY, "multiproto", "multiproto ", true);
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	else
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		print_bool(PRINT_ANY, "multiproto", "nomultiproto ", false);
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}
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static void bareudp_print_help(struct link_util *lu, int argc, char **argv,
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			       FILE *f)
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{
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	print_explain(f);
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}
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struct link_util bareudp_link_util = {
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	.id		= "bareudp",
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	.maxattr	= IFLA_BAREUDP_MAX,
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	.parse_opt	= bareudp_parse_opt,
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	.print_opt	= bareudp_print_opt,
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	.print_help	= bareudp_print_help,
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};