mirror of
https://git.kernel.org/pub/scm/network/iproute2/iproute2.git
synced 2024-11-17 06:53:26 +08:00
f0612d566b
Add support for 'passthru' mode when creating a macvlan/macvtap device which allows takeover of the underlying device and passing it to a KVM guest using virtio with macvtap backend. Only one macvlan device is allowed in passthru mode and it inherits the mac address from the underlying device and sets it in promiscuous mode to receive and forward all the packets. Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
/*
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* iplink_macvtap.c macvtap device support
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <linux/if_link.h>
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#include "rt_names.h"
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#include "utils.h"
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#include "ip_common.h"
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static void explain(void)
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{
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fprintf(stderr,
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"Usage: ... macvtap mode { private | vepa | bridge | passthru }\n"
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);
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}
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static int mode_arg(void)
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{
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fprintf(stderr, "Error: argument of \"mode\" must be \"private\", "
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"\"vepa\", \"bridge\" or \"passthru\" \n");
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return -1;
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}
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static int macvtap_parse_opt(struct link_util *lu, int argc, char **argv,
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struct nlmsghdr *n)
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{
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while (argc > 0) {
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if (matches(*argv, "mode") == 0) {
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__u32 mode = 0;
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NEXT_ARG();
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if (strcmp(*argv, "private") == 0)
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mode = MACVLAN_MODE_PRIVATE;
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else if (strcmp(*argv, "vepa") == 0)
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mode = MACVLAN_MODE_VEPA;
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else if (strcmp(*argv, "bridge") == 0)
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mode = MACVLAN_MODE_BRIDGE;
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else if (strcmp(*argv, "passthru") == 0)
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mode = MACVLAN_MODE_PASSTHRU;
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else
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return mode_arg();
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addattr32(n, 1024, IFLA_MACVLAN_MODE, mode);
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} else if (matches(*argv, "help") == 0) {
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explain();
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return -1;
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} else {
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fprintf(stderr, "macvtap: what is \"%s\"?\n", *argv);
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explain();
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return -1;
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}
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argc--, argv++;
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}
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return 0;
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}
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static void macvtap_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
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{
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__u32 mode;
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if (!tb)
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return;
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if (!tb[IFLA_MACVLAN_MODE] ||
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RTA_PAYLOAD(tb[IFLA_MACVLAN_MODE]) < sizeof(__u32))
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return;
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mode = *(__u32 *)RTA_DATA(tb[IFLA_VLAN_ID]);
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fprintf(f, " mode %s ",
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mode == MACVLAN_MODE_PRIVATE ? "private"
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: mode == MACVLAN_MODE_VEPA ? "vepa"
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: mode == MACVLAN_MODE_BRIDGE ? "bridge"
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: mode == MACVLAN_MODE_PASSTHRU ? "passthru"
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: "unknown");
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}
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struct link_util macvtap_link_util = {
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.id = "macvtap",
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.maxattr = IFLA_MACVLAN_MAX,
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.parse_opt = macvtap_parse_opt,
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.print_opt = macvtap_print_opt,
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};
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