1/*
2 * iplink_macvtap.c	macvtap device support
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
10#include <stdio.h>
11#include <stdlib.h>
12#include <string.h>
13#include <sys/socket.h>
14#include <linux/if_link.h>
15
16#include "rt_names.h"
17#include "utils.h"
18#include "ip_common.h"
19
20static void explain(void)
21{
22	fprintf(stderr,
23		"Usage: ... macvtap mode { private | vepa | bridge | passthru }\n"
24	);
25}
26
27static int mode_arg(void)
28{
29        fprintf(stderr, "Error: argument of \"mode\" must be \"private\", "
30		"\"vepa\", \"bridge\" or \"passthru\" \n");
31        return -1;
32}
33
34static int macvtap_parse_opt(struct link_util *lu, int argc, char **argv,
35			  struct nlmsghdr *n)
36{
37	while (argc > 0) {
38		if (matches(*argv, "mode") == 0) {
39			__u32 mode = 0;
40			NEXT_ARG();
41
42			if (strcmp(*argv, "private") == 0)
43				mode = MACVLAN_MODE_PRIVATE;
44			else if (strcmp(*argv, "vepa") == 0)
45				mode = MACVLAN_MODE_VEPA;
46			else if (strcmp(*argv, "bridge") == 0)
47				mode = MACVLAN_MODE_BRIDGE;
48			else if (strcmp(*argv, "passthru") == 0)
49				mode = MACVLAN_MODE_PASSTHRU;
50			else
51				return mode_arg();
52
53			addattr32(n, 1024, IFLA_MACVLAN_MODE, mode);
54		} else if (matches(*argv, "help") == 0) {
55			explain();
56			return -1;
57		} else {
58			fprintf(stderr, "macvtap: what is \"%s\"?\n", *argv);
59			explain();
60			return -1;
61		}
62		argc--, argv++;
63	}
64
65	return 0;
66}
67
68static void macvtap_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
69{
70	__u32 mode;
71
72	if (!tb)
73		return;
74
75	if (!tb[IFLA_MACVLAN_MODE] ||
76	    RTA_PAYLOAD(tb[IFLA_MACVLAN_MODE]) < sizeof(__u32))
77		return;
78
79	mode = rta_getattr_u32(tb[IFLA_VLAN_ID]);
80	fprintf(f, " mode %s ",
81		  mode == MACVLAN_MODE_PRIVATE ? "private"
82		: mode == MACVLAN_MODE_VEPA    ? "vepa"
83		: mode == MACVLAN_MODE_BRIDGE  ? "bridge"
84		: mode == MACVLAN_MODE_PASSTHRU  ? "passthru"
85		:				 "unknown");
86}
87
88struct link_util macvtap_link_util = {
89	.id		= "macvtap",
90	.maxattr	= IFLA_MACVLAN_MAX,
91	.parse_opt	= macvtap_parse_opt,
92	.print_opt	= macvtap_print_opt,
93};
94