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-rw-r--r--vpp/vnet/vnet/mpls/mpls_tunnel.c787
1 files changed, 787 insertions, 0 deletions
diff --git a/vpp/vnet/vnet/mpls/mpls_tunnel.c b/vpp/vnet/vnet/mpls/mpls_tunnel.c
new file mode 100644
index 00000000..8d1e30a3
--- /dev/null
+++ b/vpp/vnet/vnet/mpls/mpls_tunnel.c
@@ -0,0 +1,787 @@
+/*
+ * mpls_tunnel.c: MPLS tunnel interfaces (i.e. for RSVP-TE)
+ *
+ * Copyright (c) 2012 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.
+ */
+
+#include <vnet/vnet.h>
+#include <vnet/pg/pg.h>
+#include <vnet/mpls/mpls_tunnel.h>
+#include <vnet/ip/ip.h>
+#include <vnet/fib/fib_path_list.h>
+#include <vnet/adj/adj_midchain.h>
+
+/**
+ * @brief pool of tunnel instances
+ */
+static mpls_tunnel_t *mpls_tunnel_pool;
+
+/**
+ * @brief Pool of free tunnel SW indices - i.e. recycled indices
+ */
+static u32 * mpls_tunnel_free_hw_if_indices;
+
+/**
+ * @brief DB of SW index to tunnel index
+ */
+static u32 *mpls_tunnel_db;
+
+/**
+ * @brief Get a tunnel object from a SW interface index
+ */
+static mpls_tunnel_t*
+mpls_tunnel_get_from_sw_if_index (u32 sw_if_index)
+{
+ if ((vec_len(mpls_tunnel_db) < sw_if_index) ||
+ (~0 == mpls_tunnel_db[sw_if_index]))
+ return (NULL);
+
+ return (pool_elt_at_index(mpls_tunnel_pool,
+ mpls_tunnel_db[sw_if_index]));
+}
+
+/**
+ * @brief Return true if the label stack is imp-null only
+ */
+static fib_forward_chain_type_t
+mpls_tunnel_get_fwd_chain_type (const mpls_tunnel_t *mt)
+{
+ if ((1 == vec_len(mt->mt_label_stack)) &&
+ (mt->mt_label_stack[0] == MPLS_IETF_IMPLICIT_NULL_LABEL))
+ {
+ /*
+ * the only label in the label stack is implicit null
+ * we need to build an IP chain.
+ */
+ if (FIB_PROTOCOL_IP4 == fib_path_list_get_proto(mt->mt_path_list))
+ {
+ return (FIB_FORW_CHAIN_TYPE_UNICAST_IP4);
+ }
+ else
+ {
+ return (FIB_FORW_CHAIN_TYPE_UNICAST_IP6);
+ }
+ }
+ else
+ {
+ return (FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS);
+ }
+}
+
+/**
+ * @brief Build a rewrite string for the MPLS tunnel.
+ *
+ * We have choices here;
+ * 1 - have an Adjacency with a zero length string and stack it on
+ * MPLS label objects
+ * 2 - put the label header rewrites in the adjacency string.
+ *
+ * We choose 2 since it results in fewer graph nodes in the egress path
+ */
+static u8*
+mpls_tunnel_build_rewrite (vnet_main_t * vnm,
+ u32 sw_if_index,
+ vnet_link_t link_type,
+ const void *dst_address)
+{
+ mpls_unicast_header_t *muh;
+ mpls_tunnel_t *mt;
+ u8 *rewrite;
+ u32 mti, ii;
+
+ rewrite = NULL;
+ mti = mpls_tunnel_db[sw_if_index];
+ mt = pool_elt_at_index(mpls_tunnel_pool, mti);
+
+ /*
+ * The vector must be allocated as u8 so the length is correct
+ */
+ ASSERT(0 < vec_len(mt->mt_label_stack));
+ vec_validate(rewrite, (sizeof(*muh) * vec_len(mt->mt_label_stack)) - 1);
+ ASSERT(rewrite);
+ muh = (mpls_unicast_header_t *)rewrite;
+
+ /*
+ * The last (inner most) label in the stack may be EOS, all the rest Non-EOS
+ */
+ for (ii = 0; ii < vec_len(mt->mt_label_stack)-1; ii++)
+ {
+ vnet_mpls_uc_set_label(&muh[ii].label_exp_s_ttl, mt->mt_label_stack[ii]);
+ vnet_mpls_uc_set_ttl(&muh[ii].label_exp_s_ttl, 255);
+ vnet_mpls_uc_set_exp(&muh[ii].label_exp_s_ttl, 0);
+ vnet_mpls_uc_set_s(&muh[ii].label_exp_s_ttl, MPLS_NON_EOS);
+ muh[ii].label_exp_s_ttl = clib_host_to_net_u32(muh[ii].label_exp_s_ttl);
+ }
+
+ vnet_mpls_uc_set_label(&muh[ii].label_exp_s_ttl, mt->mt_label_stack[ii]);
+ vnet_mpls_uc_set_ttl(&muh[ii].label_exp_s_ttl, 255);
+ vnet_mpls_uc_set_exp(&muh[ii].label_exp_s_ttl, 0);
+
+ if ((VNET_LINK_MPLS == link_type) &&
+ (mt->mt_label_stack[ii] != MPLS_IETF_IMPLICIT_NULL_LABEL))
+ {
+ vnet_mpls_uc_set_s(&muh[ii].label_exp_s_ttl, MPLS_NON_EOS);
+ }
+ else
+ {
+ vnet_mpls_uc_set_s(&muh[ii].label_exp_s_ttl, MPLS_EOS);
+ }
+
+ muh[ii].label_exp_s_ttl = clib_host_to_net_u32(muh[ii].label_exp_s_ttl);
+
+ return (rewrite);
+}
+
+/**
+ * mpls_tunnel_stack
+ *
+ * 'stack' (resolve the recursion for) the tunnel's midchain adjacency
+ */
+static void
+mpls_tunnel_stack (adj_index_t ai)
+{
+ ip_adjacency_t *adj;
+ mpls_tunnel_t *mt;
+ u32 sw_if_index;
+
+ adj = adj_get(ai);
+ sw_if_index = adj->rewrite_header.sw_if_index;
+
+ mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
+
+ if (NULL == mt)
+ return;
+
+ /*
+ * find the adjacency that is contributed by the FIB path-list
+ * that this tunnel resovles via, and use it as the next adj
+ * in the midchain
+ */
+ if (vnet_hw_interface_get_flags(vnet_get_main(),
+ mt->mt_hw_if_index) &
+ VNET_HW_INTERFACE_FLAG_LINK_UP)
+ {
+ dpo_id_t dpo = DPO_INVALID;
+
+ fib_path_list_contribute_forwarding(mt->mt_path_list,
+ mpls_tunnel_get_fwd_chain_type(mt),
+ &dpo);
+
+ if (DPO_LOAD_BALANCE == dpo.dpoi_type)
+ {
+ /*
+ * we don't support multiple paths, so no need to load-balance.
+ * pull the first and only choice and stack directly on that.
+ */
+ load_balance_t *lb;
+
+ lb = load_balance_get (dpo.dpoi_index);
+
+ ASSERT(1 == lb->lb_n_buckets);
+
+ dpo_copy(&dpo, load_balance_get_bucket_i (lb, 0));
+ }
+
+ adj_nbr_midchain_stack(ai, &dpo);
+ dpo_reset(&dpo);
+ }
+ else
+ {
+ adj_nbr_midchain_unstack(ai);
+ }
+}
+
+/**
+ * @brief Call back when restacking all adjacencies on a MPLS interface
+ */
+static adj_walk_rc_t
+mpls_adj_walk_cb (adj_index_t ai,
+ void *ctx)
+{
+ mpls_tunnel_stack(ai);
+
+ return (ADJ_WALK_RC_CONTINUE);
+}
+
+static void
+mpls_tunnel_restack (mpls_tunnel_t *mt)
+{
+ fib_protocol_t proto;
+
+ /*
+ * walk all the adjacencies on the MPLS interface and restack them
+ */
+ FOR_EACH_FIB_PROTOCOL(proto)
+ {
+ adj_nbr_walk(mt->mt_sw_if_index,
+ proto,
+ mpls_adj_walk_cb,
+ NULL);
+ }
+}
+
+static clib_error_t *
+mpls_tunnel_admin_up_down (vnet_main_t * vnm,
+ u32 hw_if_index,
+ u32 flags)
+{
+ vnet_hw_interface_t * hi;
+ mpls_tunnel_t *mt;
+
+ hi = vnet_get_hw_interface (vnm, hw_if_index);
+
+ mt = mpls_tunnel_get_from_sw_if_index(hi->sw_if_index);
+
+ if (NULL == mt)
+ return (NULL);
+
+ if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
+ vnet_hw_interface_set_flags (vnm, hw_if_index,
+ VNET_HW_INTERFACE_FLAG_LINK_UP);
+ else
+ vnet_hw_interface_set_flags (vnm, hw_if_index, 0 /* down */);
+
+ mpls_tunnel_restack(mt);
+
+ return (NULL);
+}
+
+/**
+ * @brief Fixup the adj rewrite post encap. This is a no-op since the
+ * rewrite is a stack of labels.
+ */
+static void
+mpls_tunnel_fixup (vlib_main_t *vm,
+ ip_adjacency_t *adj,
+ vlib_buffer_t *b0)
+{
+}
+
+static void
+mpls_tunnel_update_adj (vnet_main_t * vnm,
+ u32 sw_if_index,
+ adj_index_t ai)
+{
+ adj_nbr_midchain_update_rewrite(
+ ai, mpls_tunnel_fixup,
+ ADJ_MIDCHAIN_FLAG_NONE,
+ mpls_tunnel_build_rewrite(vnm, sw_if_index,
+ adj_get_link_type(ai),
+ NULL));
+
+ mpls_tunnel_stack(ai);
+}
+
+static u8 *
+format_mpls_tunnel_name (u8 * s, va_list * args)
+{
+ u32 dev_instance = va_arg (*args, u32);
+ return format (s, "mpls-tunnel%d", dev_instance);
+}
+
+static u8 *
+format_mpls_tunnel_device (u8 * s, va_list * args)
+{
+ u32 dev_instance = va_arg (*args, u32);
+ CLIB_UNUSED (int verbose) = va_arg (*args, int);
+
+ return (format (s, "MPLS-tunnel: id %d\n", dev_instance));
+}
+
+/**
+ * @brief Packet trace structure
+ */
+typedef struct mpls_tunnel_trace_t_
+{
+ /**
+ * Tunnel-id / index in tunnel vector
+ */
+ u32 tunnel_id;
+} mpls_tunnel_trace_t;
+
+static u8 *
+format_mpls_tunnel_tx_trace (u8 * s,
+ va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ mpls_tunnel_trace_t * t = va_arg (*args, mpls_tunnel_trace_t *);
+
+ s = format (s, "MPLS: tunnel %d", t->tunnel_id);
+ return s;
+}
+
+/**
+ * @brief TX function. Only called L2. L3 traffic uses the adj-midchains
+ */
+static uword
+mpls_tunnel_tx (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 next_index;
+ u32 * from, * to_next, n_left_from, n_left_to_next;
+ vnet_interface_output_runtime_t * rd = (void *) node->runtime_data;
+ const mpls_tunnel_t *mt;
+
+ mt = pool_elt_at_index(mpls_tunnel_pool, rd->dev_instance);
+
+ /* Vector of buffer / pkt indices we're supposed to process */
+ from = vlib_frame_vector_args (frame);
+
+ /* Number of buffers / pkts */
+ n_left_from = frame->n_vectors;
+
+ /* Speculatively send the first buffer to the last disposition we used */
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ /* set up to enqueue to our disposition with index = next_index */
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ /*
+ * FIXME DUAL LOOP
+ */
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ vlib_buffer_t * b0;
+ u32 bi0;
+
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer(vm, bi0);
+
+ vnet_buffer(b0)->ip.adj_index[VLIB_TX] = mt->mt_l2_adj;
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ mpls_tunnel_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->tunnel_id = rd->dev_instance;
+ }
+
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, mt->mt_l2_tx_arc);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ return frame->n_vectors;
+}
+
+VNET_DEVICE_CLASS (mpls_tunnel_class) = {
+ .name = "MPLS tunnel device",
+ .format_device_name = format_mpls_tunnel_name,
+ .format_device = format_mpls_tunnel_device,
+ .format_tx_trace = format_mpls_tunnel_tx_trace,
+ .tx_function = mpls_tunnel_tx,
+ .admin_up_down_function = mpls_tunnel_admin_up_down,
+};
+
+VNET_HW_INTERFACE_CLASS (mpls_tunnel_hw_interface_class) = {
+ .name = "MPLS-Tunnel",
+// .format_header = format_mpls_eth_header_with_length,
+// .unformat_header = unformat_mpls_eth_header,
+ .update_adjacency = mpls_tunnel_update_adj,
+ .build_rewrite = mpls_tunnel_build_rewrite,
+ .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P,
+};
+
+const mpls_tunnel_t *
+mpls_tunnel_get (u32 mti)
+{
+ return (pool_elt_at_index(mpls_tunnel_pool, mti));
+}
+
+/**
+ * @brief Walk all the MPLS tunnels
+ */
+void
+mpls_tunnel_walk (mpls_tunnel_walk_cb_t cb,
+ void *ctx)
+{
+ u32 mti;
+
+ pool_foreach_index(mti, mpls_tunnel_pool,
+ ({
+ cb(mti, ctx);
+ }));
+}
+
+void
+vnet_mpls_tunnel_del (u32 sw_if_index)
+{
+ mpls_tunnel_t *mt;
+
+ mt = mpls_tunnel_get_from_sw_if_index(sw_if_index);
+
+ if (NULL == mt)
+ return;
+
+ fib_path_list_child_remove(mt->mt_path_list,
+ mt->mt_sibling_index);
+ if (ADJ_INDEX_INVALID != mt->mt_l2_adj)
+ adj_unlock(mt->mt_l2_adj);
+
+ vec_free(mt->mt_label_stack);
+
+ vec_add1 (mpls_tunnel_free_hw_if_indices, mt->mt_hw_if_index);
+ pool_put(mpls_tunnel_pool, mt);
+ mpls_tunnel_db[sw_if_index] = ~0;
+}
+
+void
+vnet_mpls_tunnel_add (fib_route_path_t *rpaths,
+ mpls_label_t *label_stack,
+ u8 l2_only,
+ u32 *sw_if_index)
+{
+ vnet_hw_interface_t * hi;
+ mpls_tunnel_t *mt;
+ vnet_main_t * vnm;
+ u32 mti;
+
+ vnm = vnet_get_main();
+ pool_get(mpls_tunnel_pool, mt);
+ memset (mt, 0, sizeof (*mt));
+ mti = mt - mpls_tunnel_pool;
+ fib_node_init(&mt->mt_node, FIB_NODE_TYPE_MPLS_TUNNEL);
+ mt->mt_l2_adj = ADJ_INDEX_INVALID;
+
+ /*
+ * Create a new, or re=use and old, tunnel HW interface
+ */
+ if (vec_len (mpls_tunnel_free_hw_if_indices) > 0)
+ {
+ mt->mt_hw_if_index =
+ mpls_tunnel_free_hw_if_indices[vec_len(mpls_tunnel_free_hw_if_indices)-1];
+ _vec_len (mpls_tunnel_free_hw_if_indices) -= 1;
+ hi = vnet_get_hw_interface (vnm, mt->mt_hw_if_index);
+ hi->hw_instance = mti;
+ hi->dev_instance = mti;
+ }
+ else
+ {
+ mt->mt_hw_if_index = vnet_register_interface(
+ vnm,
+ mpls_tunnel_class.index,
+ mti,
+ mpls_tunnel_hw_interface_class.index,
+ mti);
+ hi = vnet_get_hw_interface(vnm, mt->mt_hw_if_index);
+ }
+
+ /*
+ * Add the new tunnel to the tunnel DB - key:SW if index
+ */
+ mt->mt_sw_if_index = hi->sw_if_index;
+ vec_validate_init_empty(mpls_tunnel_db, mt->mt_sw_if_index, ~0);
+ mpls_tunnel_db[mt->mt_sw_if_index] = mti;
+
+ /*
+ * construct a path-list from the path provided
+ */
+ mt->mt_path_list = fib_path_list_create(FIB_PATH_LIST_FLAG_SHARED, rpaths);
+ mt->mt_sibling_index = fib_path_list_child_add(mt->mt_path_list,
+ FIB_NODE_TYPE_MPLS_TUNNEL,
+ mti);
+
+ mt->mt_label_stack = vec_dup(label_stack);
+
+ if (l2_only)
+ {
+ mt->mt_l2_adj =
+ adj_nbr_add_or_lock(fib_path_list_get_proto(mt->mt_path_list),
+ VNET_LINK_ETHERNET,
+ &zero_addr,
+ mt->mt_sw_if_index);
+
+ mt->mt_l2_tx_arc = vlib_node_add_named_next(vlib_get_main(),
+ hi->tx_node_index,
+ "adj-l2-midchain");
+ }
+
+ *sw_if_index = mt->mt_sw_if_index;
+}
+
+static clib_error_t *
+vnet_create_mpls_tunnel_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ unformat_input_t _line_input, * line_input = &_line_input;
+ vnet_main_t * vnm = vnet_get_main();
+ u8 is_del = 0;
+ u8 l2_only = 0;
+ fib_route_path_t rpath, *rpaths = NULL;
+ mpls_label_t out_label = MPLS_LABEL_INVALID, *labels = NULL;
+ u32 sw_if_index;
+
+ memset(&rpath, 0, sizeof(rpath));
+
+ /* Get a line of input. */
+ if (! unformat_user (input, unformat_line_input, line_input))
+ return 0;
+
+ while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (line_input, "del %U",
+ unformat_vnet_sw_interface, vnm,
+ &sw_if_index))
+ is_del = 1;
+ else if (unformat (line_input, "add"))
+ is_del = 0;
+ else if (unformat (line_input, "out-label %U",
+ unformat_mpls_unicast_label, &out_label))
+ {
+ vec_add1(labels, out_label);
+ }
+ else if (unformat (line_input, "via %U %U",
+ unformat_ip4_address,
+ &rpath.frp_addr.ip4,
+ unformat_vnet_sw_interface, vnm,
+ &rpath.frp_sw_if_index))
+ {
+ rpath.frp_weight = 1;
+ rpath.frp_proto = FIB_PROTOCOL_IP4;
+ }
+
+ else if (unformat (line_input, "via %U %U",
+ unformat_ip6_address,
+ &rpath.frp_addr.ip6,
+ unformat_vnet_sw_interface, vnm,
+ &rpath.frp_sw_if_index))
+ {
+ rpath.frp_weight = 1;
+ rpath.frp_proto = FIB_PROTOCOL_IP6;
+ }
+ else if (unformat (line_input, "via %U",
+ unformat_ip6_address,
+ &rpath.frp_addr.ip6))
+ {
+ rpath.frp_fib_index = 0;
+ rpath.frp_weight = 1;
+ rpath.frp_sw_if_index = ~0;
+ rpath.frp_proto = FIB_PROTOCOL_IP6;
+ }
+ else if (unformat (line_input, "via %U",
+ unformat_ip4_address,
+ &rpath.frp_addr.ip4))
+ {
+ rpath.frp_fib_index = 0;
+ rpath.frp_weight = 1;
+ rpath.frp_sw_if_index = ~0;
+ rpath.frp_proto = FIB_PROTOCOL_IP4;
+ }
+ else if (unformat (line_input, "l2-only"))
+ l2_only = 1;
+ else
+ return clib_error_return (0, "unknown input '%U'",
+ format_unformat_error, line_input);
+ }
+
+ if (is_del)
+ {
+ vnet_mpls_tunnel_del(sw_if_index);
+ }
+ else
+ {
+ if (0 == vec_len(labels))
+ return clib_error_return (0, "No Output Labels '%U'",
+ format_unformat_error, line_input);
+
+ vec_add1(rpaths, rpath);
+ vnet_mpls_tunnel_add(rpaths, labels, l2_only, &sw_if_index);
+ }
+
+ vec_free(labels);
+ vec_free(rpaths);
+
+ return (NULL);
+}
+
+/*?
+ * This command create a uni-directional MPLS tunnel
+ *
+ * @cliexpar
+ * @cliexstart{create mpls tunnel}
+ * create mpls tunnel via 10.0.0.1 GigEthernet0/8/0 out-label 33 out-label 34
+ * @cliexend
+ ?*/
+VLIB_CLI_COMMAND (create_mpls_tunnel_command, static) = {
+ .path = "mpls tunnel",
+ .short_help =
+ "mpls tunnel via [addr] [interface] [out-labels]",
+ .function = vnet_create_mpls_tunnel_command_fn,
+};
+
+static u8 *
+format_mpls_tunnel (u8 * s, va_list * args)
+{
+ mpls_tunnel_t *mt = va_arg (*args, mpls_tunnel_t *);
+ int ii;
+
+ s = format(s, "mpls_tunnel%d: sw_if_index:%d hw_if_index:%d",
+ mt - mpls_tunnel_pool,
+ mt->mt_sw_if_index,
+ mt->mt_hw_if_index);
+ s = format(s, "\n label-stack:\n ");
+ for (ii = 0; ii < vec_len(mt->mt_label_stack); ii++)
+ {
+ s = format(s, "%d, ", mt->mt_label_stack[ii]);
+ }
+ s = format(s, "\n via:\n");
+ s = fib_path_list_format(mt->mt_path_list, s);
+ s = format(s, "\n");
+
+ return (s);
+}
+
+static clib_error_t *
+show_mpls_tunnel_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ mpls_tunnel_t * mt;
+ u32 mti = ~0;
+
+ if (pool_elts (mpls_tunnel_pool) == 0)
+ vlib_cli_output (vm, "No MPLS tunnels configured...");
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "%d", &mti))
+ ;
+ else
+ break;
+ }
+
+ if (~0 == mti)
+ {
+ pool_foreach (mt, mpls_tunnel_pool,
+ ({
+ vlib_cli_output (vm, "[@%d] %U",
+ mt - mpls_tunnel_pool,
+ format_mpls_tunnel, mt);
+ }));
+ }
+ else
+ {
+ if (pool_is_free_index(mpls_tunnel_pool, mti))
+ return clib_error_return (0, "Not atunnel index %d", mti);
+
+ mt = pool_elt_at_index(mpls_tunnel_pool, mti);
+
+ vlib_cli_output (vm, "[@%d] %U",
+ mt - mpls_tunnel_pool,
+ format_mpls_tunnel, mt);
+ }
+
+ return 0;
+}
+
+/*?
+ * This command to show MPLS tunnels
+ *
+ * @cliexpar
+ * @cliexstart{sh mpls tunnel 2}
+ * [@2] mpls_tunnel2: sw_if_index:5 hw_if_index:5
+ * label-stack:
+ * 3,
+ * via:
+ * index:26 locks:1 proto:ipv4 uPRF-list:26 len:1 itfs:[2, ]
+ * index:26 pl-index:26 ipv4 weight=1 attached-nexthop: oper-flags:resolved,
+ * 10.0.0.2 loop0
+ * [@0]: ipv4 via 10.0.0.2 loop0: IP4: de:ad:00:00:00:00 -> 00:00:11:aa:bb:cc
+ * @cliexend
+ ?*/
+VLIB_CLI_COMMAND (show_mpls_tunnel_command, static) = {
+ .path = "show mpls tunnel",
+ .function = show_mpls_tunnel_command_fn,
+};
+
+static mpls_tunnel_t *
+mpls_tunnel_from_fib_node (fib_node_t *node)
+{
+#if (CLIB_DEBUG > 0)
+ ASSERT(FIB_NODE_TYPE_MPLS_TUNNEL == node->fn_type);
+#endif
+ return ((mpls_tunnel_t*) (((char*)node) -
+ STRUCT_OFFSET_OF(mpls_tunnel_t, mt_node)));
+}
+
+/**
+ * Function definition to backwalk a FIB node
+ */
+static fib_node_back_walk_rc_t
+mpls_tunnel_back_walk (fib_node_t *node,
+ fib_node_back_walk_ctx_t *ctx)
+{
+ mpls_tunnel_restack(mpls_tunnel_from_fib_node(node));
+
+ return (FIB_NODE_BACK_WALK_CONTINUE);
+}
+
+/**
+ * Function definition to get a FIB node from its index
+ */
+static fib_node_t*
+mpls_tunnel_fib_node_get (fib_node_index_t index)
+{
+ mpls_tunnel_t * mt;
+
+ mt = pool_elt_at_index(mpls_tunnel_pool, index);
+
+ return (&mt->mt_node);
+}
+
+/**
+ * Function definition to inform the FIB node that its last lock has gone.
+ */
+static void
+mpls_tunnel_last_lock_gone (fib_node_t *node)
+{
+ /*
+ * The MPLS MPLS tunnel is a root of the graph. As such
+ * it never has children and thus is never locked.
+ */
+ ASSERT(0);
+}
+
+/*
+ * Virtual function table registered by MPLS MPLS tunnels
+ * for participation in the FIB object graph.
+ */
+const static fib_node_vft_t mpls_vft = {
+ .fnv_get = mpls_tunnel_fib_node_get,
+ .fnv_last_lock = mpls_tunnel_last_lock_gone,
+ .fnv_back_walk = mpls_tunnel_back_walk,
+};
+
+static clib_error_t *
+mpls_tunnel_init (vlib_main_t *vm)
+{
+ fib_node_register_type(FIB_NODE_TYPE_MPLS_TUNNEL, &mpls_vft);
+
+ return 0;
+}
+VLIB_INIT_FUNCTION(mpls_tunnel_init);