Blame ip/link_veth.c

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/*
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 * link_veth.c	veth driver module
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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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 * Authors:	Pavel Emelianov <xemul@openvz.org>
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 *
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 */
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#include <string.h>
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#include <net/if.h>
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#include <linux/veth.h>
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#include "utils.h"
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#include "ip_common.h"
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static void print_usage(FILE *f)
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{
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	printf("Usage: ip link <options> type veth [peer <options>]\n"
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	       "To get <options> type 'ip link add help'\n");
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}
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static void usage(void)
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{
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	print_usage(stderr);
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}
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static int veth_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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	char *type = NULL;
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	int err;
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	struct rtattr *data;
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	struct ifinfomsg *ifm, *peer_ifm;
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	unsigned int ifi_flags, ifi_change, ifi_index;
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	if (strcmp(argv[0], "peer") != 0) {
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		usage();
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		return -1;
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	}
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	ifm = NLMSG_DATA(n);
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	ifi_flags = ifm->ifi_flags;
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	ifi_change = ifm->ifi_change;
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	ifi_index = ifm->ifi_index;
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	ifm->ifi_flags = 0;
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	ifm->ifi_change = 0;
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	ifm->ifi_index = 0;
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	data = addattr_nest(n, 1024, VETH_INFO_PEER);
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	n->nlmsg_len += sizeof(struct ifinfomsg);
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	err = iplink_parse(argc - 1, argv + 1, (struct iplink_req *)n, &type);
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	if (err < 0)
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		return err;
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	if (type)
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		duparg("type", argv[err]);
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	peer_ifm = RTA_DATA(data);
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	peer_ifm->ifi_index = ifm->ifi_index;
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	peer_ifm->ifi_flags = ifm->ifi_flags;
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	peer_ifm->ifi_change = ifm->ifi_change;
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	ifm->ifi_flags = ifi_flags;
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	ifm->ifi_change = ifi_change;
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	ifm->ifi_index = ifi_index;
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	addattr_nest_end(n, data);
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	return argc - 1 - err;
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}
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static void veth_print_help(struct link_util *lu, int argc, char **argv,
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	FILE *f)
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{
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	print_usage(f);
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}
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struct link_util veth_link_util = {
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	.id = "veth",
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	.parse_opt = veth_parse_opt,
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	.print_help = veth_print_help,
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};