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/*
* Copyright (c) 2009, 2010, 2011, 2012 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include <errno.h>
#include <inttypes.h>
#include <net/if.h>
#include <poll.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <stddef.h>
#include <linux/rtnetlink.h>
#include "netlink.h"
#include "netlink-socket.h"
#include "ofpbuf.h"
#include "poll-loop.h"
#include "timeval.h"
#include "util.h"
#include "vlog.h"
static const struct nl_policy rtnlgrp_link_policy[] = {
[IFLA_IFNAME] = { .type = NL_A_STRING, .optional = false },
[IFLA_MASTER] = { .type = NL_A_U32, .optional = true },
};
int
main(int argc OVS_UNUSED, char *argv[])
{
uint64_t buf_stub[4096 / 64];
struct nl_sock *sock;
struct ofpbuf buf;
int error;
set_program_name(argv[0]);
vlog_set_levels(NULL, VLF_ANY_FACILITY, VLL_DBG);
error = nl_sock_create(NETLINK_ROUTE, &sock);
if (error) {
ovs_fatal(error, "could not create rtnetlink socket");
}
error = nl_sock_join_mcgroup(sock, RTNLGRP_LINK);
if (error) {
ovs_fatal(error, "could not join RTNLGRP_LINK multicast group");
}
ofpbuf_use_stub(&buf, buf_stub, sizeof buf_stub);
for (;;) {
error = nl_sock_recv(sock, &buf, false);
if (error == EAGAIN) {
/* Nothing to do. */
} else if (error == ENOBUFS) {
ovs_error(0, "network monitor socket overflowed");
} else if (error) {
ovs_fatal(error, "error on network monitor socket");
} else {
struct iff_flag {
unsigned int flag;
const char *name;
};
static const struct iff_flag flags[] = {
{ IFF_UP, "UP", },
{ IFF_BROADCAST, "BROADCAST", },
{ IFF_DEBUG, "DEBUG", },
{ IFF_LOOPBACK, "LOOPBACK", },
{ IFF_POINTOPOINT, "POINTOPOINT", },
{ IFF_NOTRAILERS, "NOTRAILERS", },
{ IFF_RUNNING, "RUNNING", },
{ IFF_NOARP, "NOARP", },
{ IFF_PROMISC, "PROMISC", },
{ IFF_ALLMULTI, "ALLMULTI", },
{ IFF_MASTER, "MASTER", },
{ IFF_SLAVE, "SLAVE", },
{ IFF_MULTICAST, "MULTICAST", },
{ IFF_PORTSEL, "PORTSEL", },
{ IFF_AUTOMEDIA, "AUTOMEDIA", },
{ IFF_DYNAMIC, "DYNAMIC", },
};
struct nlattr *attrs[ARRAY_SIZE(rtnlgrp_link_policy)];
struct nlmsghdr *nlh;
struct ifinfomsg *iim;
int i;
nlh = ofpbuf_at(&buf, 0, NLMSG_HDRLEN);
iim = ofpbuf_at(&buf, NLMSG_HDRLEN, sizeof *iim);
if (!iim) {
ovs_error(0, "received bad rtnl message (no ifinfomsg)");
continue;
}
if (!nl_policy_parse(&buf, NLMSG_HDRLEN + sizeof(struct ifinfomsg),
rtnlgrp_link_policy,
attrs, ARRAY_SIZE(rtnlgrp_link_policy))) {
ovs_error(0, "received bad rtnl message (policy)");
continue;
}
printf("netdev %s changed (%s):\n",
nl_attr_get_string(attrs[IFLA_IFNAME]),
(nlh->nlmsg_type == RTM_NEWLINK ? "RTM_NEWLINK"
: nlh->nlmsg_type == RTM_DELLINK ? "RTM_DELLINK"
: nlh->nlmsg_type == RTM_GETLINK ? "RTM_GETLINK"
: nlh->nlmsg_type == RTM_SETLINK ? "RTM_SETLINK"
: "other"));
printf("\tflags:");
for (i = 0; i < ARRAY_SIZE(flags); i++) {
if (iim->ifi_flags & flags[i].flag) {
printf(" %s", flags[i].name);
}
}
printf("\n");
if (attrs[IFLA_MASTER]) {
uint32_t idx = nl_attr_get_u32(attrs[IFLA_MASTER]);
char ifname[IFNAMSIZ];
if (!if_indextoname(idx, ifname)) {
strcpy(ifname, "unknown");
}
printf("\tmaster=%"PRIu32" (%s)\n", idx, ifname);
}
}
nl_sock_wait(sock, POLLIN);
poll_block();
}
}
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