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/*
* Copyright (c) 2023 Cisco and/or its affiliates.
* 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.
*/
#define _GNU_SOURCE
#include <linux-cp/lcp_interface.h>
#include <vnet/plugin/plugin.h>
#include <vnet/mpls/mpls.h>
#include <vppinfra/linux/netns.h>
#include <fcntl.h>
vlib_log_class_t lcp_mpls_sync_logger;
#define LCP_MPLS_SYNC_DBG(...) \
vlib_log_debug (lcp_mpls_sync_logger, __VA_ARGS__);
void
lcp_mpls_sync_pair_add_cb (lcp_itf_pair_t *lip)
{
u8 phy_is_enabled = mpls_sw_interface_is_enabled (lip->lip_phy_sw_if_index);
LCP_MPLS_SYNC_DBG ("pair_add_cb: mpls enabled %u, parent %U", phy_is_enabled,
format_lcp_itf_pair, lip);
if (phy_is_enabled)
mpls_sw_interface_enable_disable (&mpls_main, lip->lip_host_sw_if_index,
1);
}
void
lcp_mpls_sync_state_cb (struct mpls_main_t *mm, uword opaque, u32 sw_if_index,
u32 is_enable)
{
lcp_itf_pair_t *lip;
index_t lipi;
int curr_ns_fd = -1;
int vif_ns_fd = -1;
int ctl_fd = -1;
u8 *ctl_path = NULL;
LCP_MPLS_SYNC_DBG ("sync_state_cb: called for sw_if_index %u", sw_if_index);
// If device is LCP PHY, sync state to host tap.
lipi = lcp_itf_pair_find_by_phy (sw_if_index);
if (INDEX_INVALID != lipi)
{
lip = lcp_itf_pair_get (lipi);
LCP_MPLS_SYNC_DBG ("sync_state_cb: mpls enabled %u parent %U", is_enable,
format_lcp_itf_pair, lip);
mpls_sw_interface_enable_disable (&mpls_main, lip->lip_host_sw_if_index,
is_enable);
return;
}
// If device is LCP host, toggle MPLS XC feature.
lipi = lcp_itf_pair_find_by_host (sw_if_index);
if (INDEX_INVALID == lipi)
return;
lip = lcp_itf_pair_get (lipi);
vnet_feature_enable_disable ("mpls-input", "linux-cp-xc-mpls", sw_if_index,
is_enable, NULL, 0);
LCP_MPLS_SYNC_DBG ("sync_state_cb: mpls xc state %u parent %U", is_enable,
format_lcp_itf_pair, lip);
// If syncing is enabled, sync Linux state as well.
// This can happen regardless of lcp_get_netlink_processing_active(),
// provided it does not generate Netlink messages.
if (!lcp_sync ())
return;
if (lip->lip_namespace)
{
curr_ns_fd = clib_netns_open (NULL /* self */);
vif_ns_fd = clib_netns_open (lip->lip_namespace);
if (vif_ns_fd != -1)
clib_setns (vif_ns_fd);
}
ctl_path = format (NULL, "/proc/sys/net/mpls/conf/%s/input%c",
lip->lip_host_name, NULL);
if (NULL == ctl_path)
{
LCP_MPLS_SYNC_DBG ("sync_state_cb: failed to format sysctl");
goto SYNC_CLEANUP;
}
ctl_fd = open ((char *) ctl_path, O_WRONLY);
if (ctl_fd < 0)
{
LCP_MPLS_SYNC_DBG ("sync_state_cb: failed to open %s for writing",
ctl_path);
goto SYNC_CLEANUP;
}
if (fdformat (ctl_fd, "%u", is_enable) < 1)
{
LCP_MPLS_SYNC_DBG ("sync_state_cb: failed to write to %s", ctl_path);
goto SYNC_CLEANUP;
}
LCP_MPLS_SYNC_DBG ("sync_state_cb: set mpls input for %s",
lip->lip_host_name);
SYNC_CLEANUP:
if (ctl_fd > -1)
close (ctl_fd);
if (NULL != ctl_path)
vec_free (ctl_path);
if (vif_ns_fd != -1)
close (vif_ns_fd);
if (curr_ns_fd != -1)
{
clib_setns (curr_ns_fd);
close (curr_ns_fd);
}
}
static clib_error_t *
lcp_mpls_sync_init (vlib_main_t *vm)
{
lcp_itf_pair_vft_t mpls_sync_itf_pair_vft = {
.pair_add_fn = lcp_mpls_sync_pair_add_cb,
};
lcp_itf_pair_register_vft (&mpls_sync_itf_pair_vft);
mpls_interface_state_change_add_callback (lcp_mpls_sync_state_cb, 0);
lcp_mpls_sync_logger = vlib_log_register_class ("linux-cp", "mpls-sync");
return NULL;
}
VLIB_INIT_FUNCTION (lcp_mpls_sync_init) = {
.runs_after = VLIB_INITS ("lcp_interface_init", "mpls_init"),
};
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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