mirror of
https://github.com/openvswitch/ovs
synced 2025-10-15 14:17:18 +00:00
91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
#include <config.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <net/if.h>
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#include <poll.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <stddef.h>
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#include <linux/rtnetlink.h>
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#include "netlink.h"
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#include "ofpbuf.h"
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#include "poll-loop.h"
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#include "timeval.h"
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#include "util.h"
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#include "vlog.h"
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static const struct nl_policy rtnlgrp_link_policy[] = {
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[IFLA_IFNAME] = { .type = NL_A_STRING, .optional = false },
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[IFLA_MASTER] = { .type = NL_A_U32, .optional = true },
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};
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int
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main(int argc UNUSED, char *argv[])
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{
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struct nl_sock *sock;
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int error;
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set_program_name(argv[0]);
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time_init();
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vlog_init();
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vlog_set_levels(VLM_ANY_MODULE, VLF_ANY_FACILITY, VLL_DBG);
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error = nl_sock_create(NETLINK_ROUTE, RTNLGRP_LINK, 0, 0, &sock);
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if (error) {
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ovs_fatal(error, "could not create rtnetlink socket");
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}
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for (;;) {
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struct ofpbuf *buf;
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error = nl_sock_recv(sock, &buf, false);
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if (error == EAGAIN) {
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/* Nothing to do. */
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} else if (error == ENOBUFS) {
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ovs_error(0, "network monitor socket overflowed");
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} else if (error) {
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ovs_fatal(error, "error on network monitor socket");
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} else {
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struct nlattr *attrs[ARRAY_SIZE(rtnlgrp_link_policy)];
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struct nlmsghdr *nlh;
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struct ifinfomsg *iim;
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nlh = ofpbuf_at(buf, 0, NLMSG_HDRLEN);
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iim = ofpbuf_at(buf, NLMSG_HDRLEN, sizeof *iim);
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if (!iim) {
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ovs_error(0, "received bad rtnl message (no ifinfomsg)");
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ofpbuf_delete(buf);
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continue;
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}
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if (!nl_policy_parse(buf, NLMSG_HDRLEN + sizeof(struct ifinfomsg),
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rtnlgrp_link_policy,
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attrs, ARRAY_SIZE(rtnlgrp_link_policy))) {
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ovs_error(0, "received bad rtnl message (policy)");
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ofpbuf_delete(buf);
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continue;
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}
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printf("netdev %s changed (%s):\n",
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nl_attr_get_string(attrs[IFLA_IFNAME]),
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(nlh->nlmsg_type == RTM_NEWLINK ? "RTM_NEWLINK"
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: nlh->nlmsg_type == RTM_DELLINK ? "RTM_DELLINK"
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: nlh->nlmsg_type == RTM_GETLINK ? "RTM_GETLINK"
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: nlh->nlmsg_type == RTM_SETLINK ? "RTM_SETLINK"
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: "other"));
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if (attrs[IFLA_MASTER]) {
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uint32_t idx = nl_attr_get_u32(attrs[IFLA_MASTER]);
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char ifname[IFNAMSIZ];
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if (!if_indextoname(idx, ifname)) {
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strcpy(ifname, "unknown");
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}
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printf("\tmaster=%"PRIu32" (%s)\n", idx, ifname);
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}
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ofpbuf_delete(buf);
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}
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nl_sock_wait(sock, POLLIN);
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poll_block();
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}
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}
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