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path: root/src/plugins/linux-cp/lcp_mpls_sync.c
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Diffstat (limited to 'src/plugins/linux-cp/lcp_mpls_sync.c')
-rw-r--r--src/plugins/linux-cp/lcp_mpls_sync.c158
1 files changed, 158 insertions, 0 deletions
diff --git a/src/plugins/linux-cp/lcp_mpls_sync.c b/src/plugins/linux-cp/lcp_mpls_sync.c
new file mode 100644
index 00000000000..d4b0d13b907
--- /dev/null
+++ b/src/plugins/linux-cp/lcp_mpls_sync.c
@@ -0,0 +1,158 @@
+/*
+ * 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.
+ 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:
+ */