/*
* iplink_macvlan.c macvlan/macvtap device support
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Patrick McHardy <kaber@trash.net>
* Arnd Bergmann <arnd@arndb.de>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <linux/if_link.h>
#include <linux/if_ether.h>
#include "rt_names.h"
#include "utils.h"
#include "ip_common.h"
#define pfx_err(lu, ...) { \
fprintf(stderr, "%s: ", lu->id); \
fprintf(stderr, __VA_ARGS__); \
fprintf(stderr, "\n"); \
}
static void print_explain(struct link_util *lu, FILE *f)
{
fprintf(f,
"Usage: ... %s mode MODE [flag MODE_FLAG] MODE_OPTS\n"
"\n"
"MODE: private | vepa | bridge | passthru | source\n"
"MODE_FLAG: null | nopromisc\n"
"MODE_OPTS: for mode \"source\":\n"
"\tmacaddr { { add | del } <macaddr> | set [ <macaddr> [ <macaddr> ... ] ] | flush }\n",
lu->id
);
}
static void explain(struct link_util *lu)
{
print_explain(lu, stderr);
}
static int mode_arg(const char *arg)
{
fprintf(stderr,
"Error: argument of \"mode\" must be \"private\", \"vepa\", \"bridge\", \"passthru\" or \"source\", not \"%s\"\n",
arg);
return -1;
}
static int flag_arg(const char *arg)
{
fprintf(stderr,
"Error: argument of \"flag\" must be \"nopromisc\" or \"null\", not \"%s\"\n",
arg);
return -1;
}
static int macvlan_parse_opt(struct link_util *lu, int argc, char **argv,
struct nlmsghdr *n)
{
__u32 mode = 0;
__u16 flags = 0;
__u32 mac_mode = 0;
int has_flags = 0;
char mac[ETH_ALEN];
struct rtattr *nmac;
while (argc > 0) {
if (matches(*argv, "mode") == 0) {
NEXT_ARG();
if (strcmp(*argv, "private") == 0)
mode = MACVLAN_MODE_PRIVATE;
else if (strcmp(*argv, "vepa") == 0)
mode = MACVLAN_MODE_VEPA;
else if (strcmp(*argv, "bridge") == 0)
mode = MACVLAN_MODE_BRIDGE;
else if (strcmp(*argv, "passthru") == 0)
mode = MACVLAN_MODE_PASSTHRU;
else if (strcmp(*argv, "source") == 0)
mode = MACVLAN_MODE_SOURCE;
else
return mode_arg(*argv);
} else if (matches(*argv, "flag") == 0) {
NEXT_ARG();
if (strcmp(*argv, "nopromisc") == 0)
flags |= MACVLAN_FLAG_NOPROMISC;
else if (strcmp(*argv, "null") == 0)
flags |= 0;
else
return flag_arg(*argv);
has_flags = 1;
} else if (matches(*argv, "macaddr") == 0) {
NEXT_ARG();
if (strcmp(*argv, "add") == 0) {
mac_mode = MACVLAN_MACADDR_ADD;
} else if (strcmp(*argv, "del") == 0) {
mac_mode = MACVLAN_MACADDR_DEL;
} else if (strcmp(*argv, "set") == 0) {
mac_mode = MACVLAN_MACADDR_SET;
} else if (strcmp(*argv, "flush") == 0) {
mac_mode = MACVLAN_MACADDR_FLUSH;
} else {
explain(lu);
return -1;
}
addattr32(n, 1024, IFLA_MACVLAN_MACADDR_MODE, mac_mode);
if (mac_mode == MACVLAN_MACADDR_ADD ||
mac_mode == MACVLAN_MACADDR_DEL) {
NEXT_ARG();
if (ll_addr_a2n(mac, sizeof(mac),
*argv) != ETH_ALEN)
return -1;
addattr_l(n, 1024, IFLA_MACVLAN_MACADDR, &mac,
ETH_ALEN);
}
if (mac_mode == MACVLAN_MACADDR_SET) {
nmac = addattr_nest(n, 1024,
IFLA_MACVLAN_MACADDR_DATA);
while (NEXT_ARG_OK()) {
NEXT_ARG_FWD();
if (ll_addr_a2n(mac, sizeof(mac),
*argv) != ETH_ALEN) {
PREV_ARG();
break;
}
addattr_l(n, 1024, IFLA_MACVLAN_MACADDR,
&mac, ETH_ALEN);
}
addattr_nest_end(n, nmac);
}
} else if (matches(*argv, "nopromisc") == 0) {
flags |= MACVLAN_FLAG_NOPROMISC;
has_flags = 1;
} else if (matches(*argv, "help") == 0) {
explain(lu);
return -1;
} else {
pfx_err(lu, "unknown option \"%s\"?", *argv);
explain(lu);
return -1;
}
argc--, argv++;
}
if (mode)
addattr32(n, 1024, IFLA_MACVLAN_MODE, mode);
if (has_flags) {
if (flags & MACVLAN_FLAG_NOPROMISC &&
mode != MACVLAN_MODE_PASSTHRU) {
pfx_err(lu, "nopromisc flag only valid in passthru mode");
explain(lu);
return -1;
}
addattr16(n, 1024, IFLA_MACVLAN_FLAGS, flags);
}
return 0;
}
static void macvlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
{
__u32 mode;
__u16 flags;
__u32 count;
unsigned char *addr;
int len;
struct rtattr *rta;
if (!tb)
return;
if (!tb[IFLA_MACVLAN_MODE] ||
RTA_PAYLOAD(tb[IFLA_MACVLAN_MODE]) < sizeof(__u32))
return;
mode = rta_getattr_u32(tb[IFLA_MACVLAN_MODE]);
print_string(PRINT_ANY,
"mode",
"mode %s ",
mode == MACVLAN_MODE_PRIVATE ? "private"
: mode == MACVLAN_MODE_VEPA ? "vepa"
: mode == MACVLAN_MODE_BRIDGE ? "bridge"
: mode == MACVLAN_MODE_PASSTHRU ? "passthru"
: mode == MACVLAN_MODE_SOURCE ? "source"
: "unknown");
if (!tb[IFLA_MACVLAN_FLAGS] ||
RTA_PAYLOAD(tb[IFLA_MACVLAN_FLAGS]) < sizeof(__u16))
flags = 0;
else
flags = rta_getattr_u16(tb[IFLA_MACVLAN_FLAGS]);
if (flags & MACVLAN_FLAG_NOPROMISC)
print_bool(PRINT_ANY, "nopromisc", "nopromisc ", true);
/* in source mode, there are more options to print */
if (mode != MACVLAN_MODE_SOURCE)
return;
if (!tb[IFLA_MACVLAN_MACADDR_COUNT] ||
RTA_PAYLOAD(tb[IFLA_MACVLAN_MACADDR_COUNT]) < sizeof(__u32))
return;
count = rta_getattr_u32(tb[IFLA_MACVLAN_MACADDR_COUNT]);
print_int(PRINT_ANY, "macaddr_count", "remotes (%d) ", count);
if (!tb[IFLA_MACVLAN_MACADDR_DATA])
return;
rta = RTA_DATA(tb[IFLA_MACVLAN_MACADDR_DATA]);
len = RTA_PAYLOAD(tb[IFLA_MACVLAN_MACADDR_DATA]);
open_json_array(PRINT_JSON, "macaddr_data");
for (; RTA_OK(rta, len); rta = RTA_NEXT(rta, len)) {
if (rta->rta_type != IFLA_MACVLAN_MACADDR ||
RTA_PAYLOAD(rta) < 6)
continue;
addr = RTA_DATA(rta);
if (is_json_context()) {
SPRINT_BUF(b1);
snprintf(b1, sizeof(b1),
"%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", addr[0],
addr[1], addr[2], addr[3], addr[4], addr[5]);
print_string(PRINT_JSON, NULL, NULL, b1);
} else {
fprintf(f, "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x ", addr[0],
addr[1], addr[2], addr[3], addr[4], addr[5]);
}
}
close_json_array(PRINT_JSON, NULL);
}
static void macvlan_print_help(struct link_util *lu, int argc, char **argv,
FILE *f)
{
print_explain(lu, f);
}
struct link_util macvlan_link_util = {
.id = "macvlan",
.maxattr = IFLA_MACVLAN_MAX,
.parse_opt = macvlan_parse_opt,
.print_opt = macvlan_print_opt,
.print_help = macvlan_print_help,
};
struct link_util macvtap_link_util = {
.id = "macvtap",
.maxattr = IFLA_MACVLAN_MAX,
.parse_opt = macvlan_parse_opt,
.print_opt = macvlan_print_opt,
.print_help = macvlan_print_help,
};