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      1 /* iplink_ipvlan.c	IPVLAN device support
      2  *
      3  *              This program is free software; you can redistribute it and/or
      4  *              modify it under the terms of the GNU General Public License
      5  *              as published by the Free Software Foundation; either version
      6  *              2 of the License, or (at your option) any later version.
      7  *
      8  * Authors:     Mahesh Bandewar <maheshb (at) google.com>
      9  */
     10 
     11 #include <stdio.h>
     12 #include <stdlib.h>
     13 #include <string.h>
     14 #include <sys/socket.h>
     15 #include <linux/if_link.h>
     16 
     17 #include "rt_names.h"
     18 #include "utils.h"
     19 #include "ip_common.h"
     20 
     21 static void ipvlan_explain(FILE *f)
     22 {
     23 	fprintf(f, "Usage: ... ipvlan [ mode { l2 | l3 } ]\n");
     24 }
     25 
     26 static void explain(void)
     27 {
     28 	ipvlan_explain(stderr);
     29 }
     30 
     31 static int mode_arg(void)
     32 {
     33 	fprintf(stderr, "Error: argument of \"mode\" must be either \"l2\", "
     34 		"or \"l3\"\n");
     35 	return -1;
     36 }
     37 
     38 static int ipvlan_parse_opt(struct link_util *lu, int argc, char **argv,
     39 			    struct nlmsghdr *n)
     40 {
     41 	while (argc > 0) {
     42 		if (matches(*argv, "mode") == 0) {
     43 			__u16 mode = 0;
     44 			NEXT_ARG();
     45 
     46 			if (strcmp(*argv, "l2") == 0)
     47 				mode = IPVLAN_MODE_L2;
     48 			else if (strcmp(*argv, "l3") == 0)
     49 				mode = IPVLAN_MODE_L3;
     50 			else
     51 				return mode_arg();
     52 
     53 			addattr16(n, 1024, IFLA_IPVLAN_MODE, mode);
     54 		} else if (matches(*argv, "help") == 0) {
     55 			explain();
     56 			return -1;
     57 		} else {
     58 			fprintf(stderr, "ipvlan: unknown option \"%s\"?\n",
     59 				*argv);
     60 			explain();
     61 			return -1;
     62 		}
     63 		argc--, argv++;
     64 	}
     65 
     66 	return 0;
     67 }
     68 
     69 static void ipvlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
     70 {
     71 
     72 	if (!tb)
     73 		return;
     74 
     75 	if (tb[IFLA_IPVLAN_MODE]) {
     76 		if (RTA_PAYLOAD(tb[IFLA_IPVLAN_MODE]) == sizeof(__u16)) {
     77 			__u16 mode = rta_getattr_u16(tb[IFLA_IPVLAN_MODE]);
     78 
     79 			fprintf(f, " mode %s ",
     80 				mode == IPVLAN_MODE_L2 ? "l2" :
     81 				mode == IPVLAN_MODE_L3 ? "l3" : "unknown");
     82 		}
     83 	}
     84 }
     85 
     86 static void ipvlan_print_help(struct link_util *lu, int argc, char **argv,
     87 			      FILE *f)
     88 {
     89 	ipvlan_explain(f);
     90 }
     91 
     92 struct link_util ipvlan_link_util = {
     93 	.id		= "ipvlan",
     94 	.maxattr	= IFLA_IPVLAN_MAX,
     95 	.parse_opt	= ipvlan_parse_opt,
     96 	.print_opt	= ipvlan_print_opt,
     97 	.print_help	= ipvlan_print_help,
     98 };
     99