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 20 static void explain(void) 21 { 22 fprintf(stderr, 23 "Usage: ... macvtap mode { private | vepa | bridge | passthru }\n" 24 ); 25 } 26 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 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 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