/* Opens a socket for brcompat notifications. Returns 0 if successful, * otherwise a positive errno value. */ static int brc_open(struct nl_sock **sock) { int multicast_group = 0; int retval; retval = nl_lookup_genl_family(BRC_GENL_FAMILY_NAME, &brc_family); if (retval) { return retval; } retval = lookup_brc_multicast_group(&multicast_group); if (retval) { return retval; } retval = nl_sock_create(NETLINK_GENERIC, sock); if (retval) { return retval; } retval = nl_sock_join_mcgroup(*sock, multicast_group); if (retval) { nl_sock_destroy(*sock); *sock = NULL; } return retval; }
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", }, #ifndef _WIN32 { IFF_DEBUG, "DEBUG", }, #endif { IFF_LOOPBACK, "LOOPBACK", }, #ifndef _WIN32 { IFF_POINTOPOINT, "POINTOPOINT", }, { IFF_NOTRAILERS, "NOTRAILERS", }, #endif { IFF_RUNNING, "RUNNING", }, #ifndef _WIN32 { IFF_NOARP, "NOARP", }, #endif { IFF_PROMISC, "PROMISC", }, #ifndef _WIN32 { IFF_ALLMULTI, "ALLMULTI", }, { IFF_MASTER, "MASTER", }, { IFF_SLAVE, "SLAVE", }, #endif { IFF_MULTICAST, "MULTICAST", }, #ifndef _WIN32 { IFF_PORTSEL, "PORTSEL", }, { IFF_AUTOMEDIA, "AUTOMEDIA", }, { IFF_DYNAMIC, "DYNAMIC", }, #endif }; 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" #ifndef _WIN32 : nlh->nlmsg_type == RTM_DELLINK ? "RTM_DELLINK" #endif : nlh->nlmsg_type == RTM_GETLINK ? "RTM_GETLINK" #ifndef _WIN32 : nlh->nlmsg_type == RTM_SETLINK ? "RTM_SETLINK" #endif : "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]; #ifndef _WIN32 if (!if_indextoname(idx, ifname)) { strcpy(ifname, "unknown"); } #endif printf("\tmaster=%"PRIu32" (%s)\n", idx, ifname); } } nl_sock_wait(sock, POLLIN); poll_block(); } }