int main(int argc, char *argv[])
{
struct nl_cache_mngr *mngr;
struct nl_cache *cache;
int err, i;
dp.dp_fd = stdout;
signal(SIGINT, sigint);
err = nl_cache_mngr_alloc(NULL, NETLINK_ROUTE, NL_AUTO_PROVIDE, &mngr);
if (err < 0)
nl_cli_fatal(err, "Unable to allocate cache manager: %s",
nl_geterror(err));
for (i = 1; i < argc; i++) {
err = nl_cache_mngr_add(mngr, argv[i], &change_cb, NULL, &cache);
if (err < 0)
nl_cli_fatal(err, "Unable to add cache %s: %s",
argv[i], nl_geterror(err));
}
while (!quit) {
int err = nl_cache_mngr_poll(mngr, 1000);
if (err < 0 && err != -NLE_INTR)
nl_cli_fatal(err, "Polling failed: %s", nl_geterror(err));
nl_cache_mngr_info(mngr, &dp);
}
nl_cache_mngr_free(mngr);
return 0;
}
void
ind_ovs_port_init(void)
{
int nlerr;
route_cache_sock = nl_socket_alloc();
if (route_cache_sock == NULL) {
LOG_ERROR("nl_socket_alloc failed");
abort();
}
if ((nlerr = nl_cache_mngr_alloc(route_cache_sock, NETLINK_ROUTE,
0, &route_cache_mngr)) < 0) {
LOG_ERROR("nl_cache_mngr_alloc failed: %s", nl_geterror(nlerr));
abort();
}
if ((nlerr = nl_cache_mngr_add(route_cache_mngr, "route/link", link_change_cb, NULL, &link_cache)) < 0) {
LOG_ERROR("nl_cache_mngr_add failed: %s", nl_geterror(nlerr));
abort();
}
if (ind_soc_socket_register(nl_cache_mngr_get_fd(route_cache_mngr),
(ind_soc_socket_ready_callback_f)route_cache_mngr_socket_cb,
NULL) < 0) {
LOG_ERROR("failed to register socket");
abort();
}
netlink_callbacks = nl_cb_alloc(NL_CB_DEFAULT);
if (netlink_callbacks == NULL) {
LOG_ERROR("failed to allocate netlink callbacks");
abort();
}
}
int main(int argc, char *argv[])
{
struct nl_cache_mngr *mngr;
struct nl_sock *sock;
struct nl_cache *ct;
sock = nlt_socket_alloc();
mngr = nl_cache_mngr_alloc(sock, NETLINK_NETFILTER, NL_AUTO_PROVIDE);
if (!mngr) {
nl_perror("nl_cache_mngr_alloc");
return -1;
}
ct = nl_cache_mngr_add(mngr, "netfilter/ct", &change_cb);
if (ct == NULL) {
nl_perror("nl_cache_mngr_add(netfilter/ct)");
return -1;
}
for (;;) {
int err = nl_cache_mngr_poll(mngr, 5000);
if (err < 0) {
nl_perror("nl_cache_mngr_poll()");
return -1;
}
}
nl_cache_mngr_free(mngr);
return 0;
}
int main(int argc, char *argv[])
{
struct nl_cache_mngr *mngr;
struct nl_cache *lc, *nc, *ac, *rc;
struct nl_sock *sock;
int err;
signal(SIGINT, sigint);
sock = nlt_alloc_socket();
err = nl_cache_mngr_alloc(sock, NETLINK_ROUTE, NL_AUTO_PROVIDE, &mngr);
if (err < 0)
fatal(err, "Unable to allocate cache manager: %s",
nl_geterror(err));
if ((err = nl_cache_mngr_add(mngr, "route/link", &change_cb, &lc)) < 0)
fatal(err, "Unable to add cache route/link: %s",
nl_geterror(err));
if ((err = nl_cache_mngr_add(mngr, "route/neigh", &change_cb, &nc)) < 0)
fatal(err, "Unable to add cache route/neigh: %s",
nl_geterror(err));
if ((err = nl_cache_mngr_add(mngr, "route/addr", &change_cb, &ac)) < 0)
fatal(err, "Unable to add cache route/addr: %s",
nl_geterror(err));
if ((err = nl_cache_mngr_add(mngr, "route/route", &change_cb, &rc)) < 0)
fatal(err, "Unable to add cache route/route: %s",
nl_geterror(err));
while (!quit) {
int err = nl_cache_mngr_poll(mngr, 5000);
if (err < 0 && err != -NLE_INTR)
fatal(err, "Polling failed: %s", nl_geterror(err));
}
nl_cache_mngr_free(mngr);
nl_socket_free(sock);
return 0;
}
int netlink_wrapper::open_channel()
{
auto_unlocker lock(m_cache_lock);
nl_logdbg("opening netlink channel");
/*
// build to subscriptions groups mask for indicating what type of events the kernel will send on channel
unsigned subscriptions = ~RTMGRP_TC;
if (netlink_route_group_mask & nlgrpLINK) {
subscriptions |= (1 << (RTNLGRP_LINK - 1));
}
if (netlink_route_group_mask & nlgrpADDRESS) {
if (!m_preferred_family || m_preferred_family == AF_INET)
subscriptions |= (1 << (RTNLGRP_IPV4_IFADDR - 1));
if (!m_preferred_family || m_preferred_family == AF_INET6)
subscriptions |= (1 << (RTNLGRP_IPV6_IFADDR - 1));
}
if (netlink_route_group_mask & nlgrpROUTE) {
if (!m_preferred_family || m_preferred_family == AF_INET)
subscriptions |= (1 << (RTNLGRP_IPV4_ROUTE - 1));
if (!m_preferred_family || m_preferred_family == AF_INET6)
subscriptions |= (1 << (RTNLGRP_IPV4_ROUTE - 1));
}
if (netlink_route_group_mask & nlgrpPREFIX) {
if (!m_preferred_family || m_preferred_family == AF_INET6)
subscriptions |= (1 << (RTNLGRP_IPV6_PREFIX - 1));
}
if (netlink_route_group_mask & nlgrpNEIGH) {
subscriptions |= (1 << (RTNLGRP_NEIGH - 1));
}
*/
// Allocate a new netlink handle
m_handle = nl_handle_alloc();
BULLSEYE_EXCLUDE_BLOCK_START
if (m_handle == NULL) {
nl_logerr("failed to allocate netlink handle, nl_errno=%d", nl_get_errno());
return -1;
}
BULLSEYE_EXCLUDE_BLOCK_END
// set internal structure to pass the handle with callbacks from netlink
g_nl_rcv_arg.handle = m_handle;
// if multiple handles being allocated then a unique netlink PID need to be provided
// If port is 0, a unique port identifier will be generated automatically as a unique PID
nl_socket_set_local_port(m_handle, 0);
//Disables checking of sequence numbers on the netlink handle.
//This is required to allow messages to be processed which were not requested by a preceding request message, e.g. netlink events.
nl_disable_sequence_check(m_handle);
//joining group
//nl_join_groups(m_handle, 0);
// Allocate a new cache manager for RTNETLINK
// NL_AUTO_PROVIDE = automatically provide the caches added to the manager.
m_mngr = nl_cache_mngr_alloc(m_handle, NETLINK_ROUTE, NL_AUTO_PROVIDE);
BULLSEYE_EXCLUDE_BLOCK_START
if (!m_mngr) {
nl_logerr("Fail to allocate cac he manager");
return -1;
}
BULLSEYE_EXCLUDE_BLOCK_END
nl_logdbg("netlink socket is open");
m_cache_neigh = nl_cache_mngr_add(m_mngr, "route/neigh", neigh_cache_callback);
m_cache_link = nl_cache_mngr_add(m_mngr, "route/link", link_cache_callback);
m_cache_route = nl_cache_mngr_add(m_mngr, "route/route", route_cache_callback);
// set custom callback for every message to update message
nl_socket_modify_cb(m_handle, NL_CB_MSG_IN, NL_CB_CUSTOM, nl_msg_rcv_cb ,NULL);
// set the socket non-blocking
BULLSEYE_EXCLUDE_BLOCK_START
if (nl_socket_set_nonblocking(m_handle)) {
nl_logerr("Failed to set the socket non-blocking");
return -1;
}
BULLSEYE_EXCLUDE_BLOCK_END
return 0;
}