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
explain(void)20 static void explain(void)
21 {
22 fprintf(stderr,
23 "Usage: ... macvtap mode { private | vepa | bridge | passthru }\n"
24 );
25 }
26
mode_arg(void)27 static 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
macvtap_parse_opt(struct link_util * lu,int argc,char ** argv,struct nlmsghdr * n)34 static 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
macvtap_print_opt(struct link_util * lu,FILE * f,struct rtattr * tb[])68 static 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
88 struct 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