#include <vnet/adj/adj_midchain.h>
#include <vnet/adj/adj_nbr.h>
#include <vnet/mpls/mpls.h>
+#include <vnet/l2/l2_input.h>
+#include <vnet/nhrp/nhrp.h>
-static const char *gre_tunnel_type_names[] = GRE_TUNNEL_TYPE_NAMES;
+u8 *
+format_gre_tunnel_type (u8 * s, va_list * args)
+{
+ gre_tunnel_type_t type = va_arg (*args, int);
+
+ switch (type)
+ {
+#define _(n, v) case GRE_TUNNEL_TYPE_##n: \
+ s = format (s, "%s", v); \
+ break;
+ foreach_gre_tunnel_type
+#undef _
+ }
+
+ return (s);
+}
static u8 *
format_gre_tunnel (u8 * s, va_list * args)
format_ip46_address, &t->tunnel_dst.fp_addr, IP46_TYPE_ANY,
t->outer_fib_index, t->sw_if_index);
- s = format (s, "payload %s ", gre_tunnel_type_names[t->type]);
+ s = format (s, "payload %U ", format_gre_tunnel_type, t->type);
+ s = format (s, "%U ", format_tunnel_mode, t->mode);
if (t->type == GRE_TUNNEL_TYPE_ERSPAN)
s = format (s, "session %d ", t->session_id);
}
static gre_tunnel_t *
-gre_tunnel_db_find (const vnet_gre_add_del_tunnel_args_t * a,
+gre_tunnel_db_find (const vnet_gre_tunnel_add_del_args_t * a,
u32 outer_fib_index, gre_tunnel_key_t * key)
{
gre_main_t *gm = &gre_main;
if (!a->is_ipv6)
{
gre_mk_key4 (a->src.ip4, a->dst.ip4, outer_fib_index,
- a->tunnel_type, a->session_id, &key->gtk_v4);
+ a->type, a->mode, a->session_id, &key->gtk_v4);
p = hash_get_mem (gm->tunnel_by_key4, &key->gtk_v4);
}
else
{
gre_mk_key6 (&a->src.ip6, &a->dst.ip6, outer_fib_index,
- a->tunnel_type, a->session_id, &key->gtk_v6);
+ a->type, a->mode, a->session_id, &key->gtk_v6);
p = hash_get_mem (gm->tunnel_by_key6, &key->gtk_v6);
}
{
gre_main_t *gm = &gre_main;
- t->key = clib_mem_alloc (sizeof (*t->key));
- clib_memcpy (t->key, key, sizeof (*key));
-
if (t->tunnel_dst.fp_proto == FIB_PROTOCOL_IP6)
{
- hash_set_mem (gm->tunnel_by_key6, &t->key->gtk_v6, t->dev_instance);
+ hash_set_mem_alloc (&gm->tunnel_by_key6, &key->gtk_v6, t->dev_instance);
}
else
{
- hash_set_mem (gm->tunnel_by_key4, &t->key->gtk_v4, t->dev_instance);
+ hash_set_mem_alloc (&gm->tunnel_by_key4, &key->gtk_v4, t->dev_instance);
}
}
static void
-gre_tunnel_db_remove (gre_tunnel_t * t)
+gre_tunnel_db_remove (gre_tunnel_t * t, gre_tunnel_key_t * key)
{
gre_main_t *gm = &gre_main;
if (t->tunnel_dst.fp_proto == FIB_PROTOCOL_IP6)
{
- hash_unset_mem (gm->tunnel_by_key6, &t->key->gtk_v6);
+ hash_unset_mem_free (&gm->tunnel_by_key6, &key->gtk_v6);
}
else
{
- hash_unset_mem (gm->tunnel_by_key4, &t->key->gtk_v4);
+ hash_unset_mem_free (&gm->tunnel_by_key4, &key->gtk_v4);
}
-
- clib_mem_free (t->key);
- t->key = NULL;
-}
-
-static gre_tunnel_t *
-gre_tunnel_from_fib_node (fib_node_t * node)
-{
- ASSERT (FIB_NODE_TYPE_GRE_TUNNEL == node->fn_type);
- return ((gre_tunnel_t *) (((char *) node) -
- STRUCT_OFFSET_OF (gre_tunnel_t, node)));
}
/**
adj = adj_get (ai);
sw_if_index = adj->rewrite_header.sw_if_index;
- if ((vec_len (gm->tunnel_index_by_sw_if_index) < sw_if_index) ||
+ if ((vec_len (gm->tunnel_index_by_sw_if_index) <= sw_if_index) ||
(~0 == gm->tunnel_index_by_sw_if_index[sw_if_index]))
return;
if ((vnet_hw_interface_get_flags (vnet_get_main (), gt->hw_if_index) &
VNET_HW_INTERFACE_FLAG_LINK_UP) == 0)
{
- adj_nbr_midchain_unstack (ai);
- return;
+ adj_midchain_delegate_unstack (ai);
}
-
- dpo_id_t tmp = DPO_INVALID;
- fib_forward_chain_type_t fib_fwd = (FIB_PROTOCOL_IP6 == adj->ia_nh_proto) ?
- FIB_FORW_CHAIN_TYPE_UNICAST_IP6 : FIB_FORW_CHAIN_TYPE_UNICAST_IP4;
-
- fib_entry_contribute_forwarding (gt->fib_entry_index, fib_fwd, &tmp);
- if (DPO_LOAD_BALANCE == tmp.dpoi_type)
+ else
{
- /*
- * post GRE rewrite we will load-balance. However, the GRE encap
- * is always the same for this adjacency/tunnel and hence the IP/GRE
- * src,dst hash is always the same result too. So we do that hash now and
- * stack on the choice.
- * If the choice is an incomplete adj then we will need a poke when
- * it becomes complete. This happens since the adj update walk propagates
- * as far a recursive paths.
- */
- const dpo_id_t *choice;
- load_balance_t *lb;
- int hash;
-
- lb = load_balance_get (tmp.dpoi_index);
-
- if (fib_fwd == FIB_FORW_CHAIN_TYPE_UNICAST_IP4)
- hash = ip4_compute_flow_hash ((ip4_header_t *) adj_get_rewrite (ai),
- lb->lb_hash_config);
- else
- hash = ip6_compute_flow_hash ((ip6_header_t *) adj_get_rewrite (ai),
- lb->lb_hash_config);
- choice =
- load_balance_get_bucket_i (lb, hash & lb->lb_n_buckets_minus_1);
- dpo_copy (&tmp, choice);
+ adj_midchain_delegate_stack (ai, gt->outer_fib_index, >->tunnel_dst);
}
-
- adj_nbr_midchain_stack (ai, &tmp);
- dpo_reset (&tmp);
}
/**
}
}
-/**
- * Function definition to backwalk a FIB node
- */
-static fib_node_back_walk_rc_t
-gre_tunnel_back_walk (fib_node_t * node, fib_node_back_walk_ctx_t * ctx)
+static void
+gre_nhrp_mk_key (const gre_tunnel_t * t,
+ const nhrp_entry_t * ne, gre_tunnel_key_t * key)
{
- gre_tunnel_restack (gre_tunnel_from_fib_node (node));
+ const fib_prefix_t *nh;
- return (FIB_NODE_BACK_WALK_CONTINUE);
+ nh = nhrp_entry_get_nh (ne);
+
+ /* construct the key using mode P2P so it can be found in the DP */
+ if (FIB_PROTOCOL_IP4 == nh->fp_proto)
+ gre_mk_key4 (t->tunnel_src.ip4,
+ nh->fp_addr.ip4,
+ nhrp_entry_get_fib_index (ne),
+ t->type, TUNNEL_MODE_P2P, 0, &key->gtk_v4);
+ else
+ gre_mk_key6 (&t->tunnel_src.ip6,
+ &nh->fp_addr.ip6,
+ nhrp_entry_get_fib_index (ne),
+ t->type, TUNNEL_MODE_P2P, 0, &key->gtk_v6);
}
/**
- * Function definition to get a FIB node from its index
+ * An NHRP entry has been added
*/
-static fib_node_t *
-gre_tunnel_fib_node_get (fib_node_index_t index)
+static void
+gre_nhrp_entry_added (const nhrp_entry_t * ne)
{
- gre_tunnel_t *gt;
- gre_main_t *gm;
+ gre_main_t *gm = &gre_main;
+ const ip46_address_t *nh;
+ gre_tunnel_key_t key;
+ gre_tunnel_t *t;
+ u32 sw_if_index;
+ u32 t_idx;
+
+ sw_if_index = nhrp_entry_get_sw_if_index (ne);
+ if (vec_len (gm->tunnel_index_by_sw_if_index) < sw_if_index)
+ return;
+
+ t_idx = gm->tunnel_index_by_sw_if_index[sw_if_index];
+
+ if (INDEX_INVALID == t_idx)
+ return;
+
+ /* entry has been added on an interface for which there is a GRE tunnel */
+ t = pool_elt_at_index (gm->tunnels, t_idx);
- gm = &gre_main;
- gt = pool_elt_at_index (gm->tunnels, index);
+ if (t->mode != TUNNEL_MODE_MP)
+ return;
+
+ /* the next-hop (underlay) of the NHRP entry will form part of the key for
+ * ingress lookup to match packets to this interface */
+ gre_nhrp_mk_key (t, ne, &key);
+ gre_tunnel_db_add (t, &key);
- return (>->node);
+ /* update the rewrites for each of the adjacencies for this peer (overlay)
+ * using the next-hop (underlay) */
+ mgre_walk_ctx_t ctx = {
+ .t = t,
+ .ne = ne
+ };
+ nh = nhrp_entry_get_peer (ne);
+ adj_nbr_walk_nh (nhrp_entry_get_sw_if_index (ne),
+ (ip46_address_is_ip4 (nh) ?
+ FIB_PROTOCOL_IP4 :
+ FIB_PROTOCOL_IP6), nh, mgre_mk_complete_walk, &ctx);
}
-/**
- * Function definition to inform the FIB node that its last lock has gone.
- */
static void
-gre_tunnel_last_lock_gone (fib_node_t * node)
+gre_nhrp_entry_deleted (const nhrp_entry_t * ne)
{
- /*
- * The MPLS GRE tunnel is a root of the graph. As such
- * it never has children and thus is never locked.
- */
- ASSERT (0);
+ gre_main_t *gm = &gre_main;
+ const ip46_address_t *nh;
+ gre_tunnel_key_t key;
+ gre_tunnel_t *t;
+ u32 sw_if_index;
+ u32 t_idx;
+
+ sw_if_index = nhrp_entry_get_sw_if_index (ne);
+ if (vec_len (gm->tunnel_index_by_sw_if_index) < sw_if_index)
+ return;
+
+ t_idx = gm->tunnel_index_by_sw_if_index[sw_if_index];
+
+ if (INDEX_INVALID == t_idx)
+ return;
+
+ t = pool_elt_at_index (gm->tunnels, t_idx);
+
+ /* remove the next-hop as an ingress lookup key */
+ gre_nhrp_mk_key (t, ne, &key);
+ gre_tunnel_db_remove (t, &key);
+
+ nh = nhrp_entry_get_peer (ne);
+
+ /* make all the adjacencies incomplete */
+ adj_nbr_walk_nh (nhrp_entry_get_sw_if_index (ne),
+ (ip46_address_is_ip4 (nh) ?
+ FIB_PROTOCOL_IP4 :
+ FIB_PROTOCOL_IP6), nh, mgre_mk_incomplete_walk, t);
}
-/*
- * Virtual function table registered by MPLS GRE tunnels
- * for participation in the FIB object graph.
- */
-const static fib_node_vft_t gre_vft = {
- .fnv_get = gre_tunnel_fib_node_get,
- .fnv_last_lock = gre_tunnel_last_lock_gone,
- .fnv_back_walk = gre_tunnel_back_walk,
-};
+static walk_rc_t
+gre_tunnel_delete_nhrp_walk (index_t nei, void *ctx)
+{
+ gre_tunnel_t *t = ctx;
+ gre_tunnel_key_t key;
+
+ gre_nhrp_mk_key (t, nhrp_entry_get (nei), &key);
+ gre_tunnel_db_remove (t, &key);
+
+ return (WALK_CONTINUE);
+}
+
+static walk_rc_t
+gre_tunnel_add_nhrp_walk (index_t nei, void *ctx)
+{
+ gre_tunnel_t *t = ctx;
+ gre_tunnel_key_t key;
+
+ gre_nhrp_mk_key (t, nhrp_entry_get (nei), &key);
+ gre_tunnel_db_add (t, &key);
+
+ return (WALK_CONTINUE);
+}
static int
-vnet_gre_tunnel_add (vnet_gre_add_del_tunnel_args_t * a,
+vnet_gre_tunnel_add (vnet_gre_tunnel_add_del_args_t * a,
u32 outer_fib_index, u32 * sw_if_indexp)
{
gre_main_t *gm = &gre_main;
return VNET_API_ERROR_IF_ALREADY_EXISTS;
pool_get_aligned (gm->tunnels, t, CLIB_CACHE_LINE_BYTES);
- memset (t, 0, sizeof (*t));
+ clib_memset (t, 0, sizeof (*t));
/* Reconcile the real dev_instance and a possible requested instance */
u32 t_idx = t - gm->tunnels; /* tunnel index (or instance) */
t->dev_instance = t_idx; /* actual */
t->user_instance = u_idx; /* name */
- fib_node_init (&t->node, FIB_NODE_TYPE_GRE_TUNNEL);
- t->type = a->tunnel_type;
+ t->type = a->type;
+ t->mode = a->mode;
+ t->flags = a->flags;
if (t->type == GRE_TUNNEL_TYPE_ERSPAN)
t->session_id = a->session_id;
if (t->type == GRE_TUNNEL_TYPE_L3)
- hw_if_index = vnet_register_interface (vnm, gre_device_class.index, t_idx,
- gre_hw_interface_class.index,
- t_idx);
+ {
+ if (t->mode == TUNNEL_MODE_P2P)
+ hw_if_index =
+ vnet_register_interface (vnm, gre_device_class.index, t_idx,
+ gre_hw_interface_class.index, t_idx);
+ else
+ hw_if_index =
+ vnet_register_interface (vnm, gre_device_class.index, t_idx,
+ mgre_hw_interface_class.index, t_idx);
+ }
else
{
/* Default MAC address (d00b:eed0:0000 + sw_if_index) */
t->tunnel_dst.fp_addr = a->dst;
gre_tunnel_db_add (t, &key);
+
+ if (t->mode == TUNNEL_MODE_MP)
+ nhrp_walk_itf (t->sw_if_index, gre_tunnel_add_nhrp_walk, t);
+
if (t->type == GRE_TUNNEL_TYPE_ERSPAN)
{
gre_sn_key_t skey;
}
}
- t->fib_entry_index = fib_table_entry_special_add
- (outer_fib_index, &t->tunnel_dst, FIB_SOURCE_RR, FIB_ENTRY_FLAG_NONE);
- t->sibling_index = fib_entry_child_add
- (t->fib_entry_index, FIB_NODE_TYPE_GRE_TUNNEL, t_idx);
-
if (t->type != GRE_TUNNEL_TYPE_L3)
{
t->l2_adj_index = adj_nbr_add_or_lock
if (sw_if_indexp)
*sw_if_indexp = sw_if_index;
+ /* register gre46-input nodes */
+ ip4_register_protocol (IP_PROTOCOL_GRE, gre4_input_node.index);
+ ip6_register_protocol (IP_PROTOCOL_GRE, gre6_input_node.index);
+
return 0;
}
static int
-vnet_gre_tunnel_delete (vnet_gre_add_del_tunnel_args_t * a,
+vnet_gre_tunnel_delete (vnet_gre_tunnel_add_del_args_t * a,
u32 outer_fib_index, u32 * sw_if_indexp)
{
gre_main_t *gm = &gre_main;
if (NULL == t)
return VNET_API_ERROR_NO_SUCH_ENTRY;
+ if (t->mode == TUNNEL_MODE_MP)
+ nhrp_walk_itf (t->sw_if_index, gre_tunnel_delete_nhrp_walk, t);
+
sw_if_index = t->sw_if_index;
vnet_sw_interface_set_flags (vnm, sw_if_index, 0 /* down */ );
/* make sure tunnel is removed from l2 bd or xconnect */
- set_int_l2_mode (gm->vlib_main, vnm, MODE_L3, sw_if_index, 0, 0, 0, 0);
+ set_int_l2_mode (gm->vlib_main, vnm, MODE_L3, sw_if_index, 0,
+ L2_BD_PORT_TYPE_NORMAL, 0, 0);
gm->tunnel_index_by_sw_if_index[sw_if_index] = ~0;
if (t->type == GRE_TUNNEL_TYPE_L3)
ethernet_delete_interface (vnm, t->hw_if_index);
if (t->l2_adj_index != ADJ_INDEX_INVALID)
- adj_unlock (t->l2_adj_index);
-
- fib_entry_child_remove (t->fib_entry_index, t->sibling_index);
- fib_table_entry_delete_index (t->fib_entry_index, FIB_SOURCE_RR);
+ {
+ adj_midchain_delegate_unstack (t->l2_adj_index);
+ adj_unlock (t->l2_adj_index);
+ }
ASSERT ((t->type != GRE_TUNNEL_TYPE_ERSPAN) || (t->gre_sn != NULL));
if ((t->type == GRE_TUNNEL_TYPE_ERSPAN) && (t->gre_sn->ref_count-- == 1))
}
hash_unset (gm->instance_used, t->user_instance);
- gre_tunnel_db_remove (t);
- fib_node_deinit (&t->node);
+ gre_tunnel_db_remove (t, &key);
pool_put (gm->tunnels, t);
if (sw_if_indexp)
}
int
-vnet_gre_add_del_tunnel (vnet_gre_add_del_tunnel_args_t * a,
+vnet_gre_tunnel_add_del (vnet_gre_tunnel_add_del_args_t * a,
u32 * sw_if_indexp)
{
u32 outer_fib_index;
if (!a->is_ipv6)
- outer_fib_index = ip4_fib_index_from_table_id (a->outer_fib_id);
+ outer_fib_index = ip4_fib_index_from_table_id (a->outer_table_id);
else
- outer_fib_index = ip6_fib_index_from_table_id (a->outer_fib_id);
+ outer_fib_index = ip6_fib_index_from_table_id (a->outer_table_id);
if (~0 == outer_fib_index)
return VNET_API_ERROR_NO_SUCH_FIB;
if (a->session_id > GTK_SESSION_ID_MAX)
return VNET_API_ERROR_INVALID_SESSION_ID;
+ if (a->mode == TUNNEL_MODE_MP && !ip46_address_is_zero (&a->dst))
+ return (VNET_API_ERROR_INVALID_DST_ADDRESS);
+
if (a->is_add)
return (vnet_gre_tunnel_add (a, outer_fib_index, sw_if_indexp));
else
vlib_cli_command_t * cmd)
{
unformat_input_t _line_input, *line_input = &_line_input;
- vnet_gre_add_del_tunnel_args_t _a, *a = &_a;
- ip46_address_t src, dst;
+ vnet_gre_tunnel_add_del_args_t _a, *a = &_a;
+ ip46_address_t src = ip46_address_initializer, dst =
+ ip46_address_initializer;
u32 instance = ~0;
- u32 outer_fib_id = 0;
+ u32 outer_table_id = 0;
gre_tunnel_type_t t_type = GRE_TUNNEL_TYPE_L3;
+ tunnel_mode_t t_mode = TUNNEL_MODE_P2P;
u32 session_id = 0;
int rv;
- u32 num_m_args = 0;
u8 is_add = 1;
u32 sw_if_index;
clib_error_t *error = NULL;
- u8 ipv4_set = 0;
- u8 ipv6_set = 0;
/* Get a line of input. */
if (!unformat_user (input, unformat_line_input, line_input))
is_add = 0;
else if (unformat (line_input, "instance %d", &instance))
;
- else
- if (unformat (line_input, "src %U", unformat_ip4_address, &src.ip4))
- {
- num_m_args++;
- ipv4_set = 1;
- }
- else
- if (unformat (line_input, "dst %U", unformat_ip4_address, &dst.ip4))
- {
- num_m_args++;
- ipv4_set = 1;
- }
- else
- if (unformat (line_input, "src %U", unformat_ip6_address, &src.ip6))
- {
- num_m_args++;
- ipv6_set = 1;
- }
- else
- if (unformat (line_input, "dst %U", unformat_ip6_address, &dst.ip6))
- {
- num_m_args++;
- ipv6_set = 1;
- }
- else if (unformat (line_input, "outer-fib-id %d", &outer_fib_id))
+ else if (unformat (line_input, "src %U", unformat_ip46_address, &src))
;
+ else if (unformat (line_input, "dst %U", unformat_ip46_address, &dst))
+ ;
+ else if (unformat (line_input, "outer-table-id %d", &outer_table_id))
+ ;
+ else if (unformat (line_input, "multipoint"))
+ t_mode = TUNNEL_MODE_MP;
else if (unformat (line_input, "teb"))
t_type = GRE_TUNNEL_TYPE_TEB;
else if (unformat (line_input, "erspan %d", &session_id))
}
}
- if (num_m_args < 2)
+ if (ip46_address_is_equal (&src, &dst))
{
- error = clib_error_return (0, "mandatory argument(s) missing");
+ error = clib_error_return (0, "src and dst are identical");
goto done;
}
- if ((ipv4_set && memcmp (&src.ip4, &dst.ip4, sizeof (src.ip4)) == 0) ||
- (ipv6_set && memcmp (&src.ip6, &dst.ip6, sizeof (src.ip6)) == 0))
+ if (t_mode != TUNNEL_MODE_MP && ip46_address_is_zero (&dst))
{
- error = clib_error_return (0, "src and dst are identical");
+ error = clib_error_return (0, "destination address not specified");
goto done;
}
- if (ipv4_set && ipv6_set)
- return clib_error_return (0, "both IPv4 and IPv6 addresses specified");
+ if (ip46_address_is_zero (&src))
+ {
+ error = clib_error_return (0, "source address not specified");
+ goto done;
+ }
- if ((ipv4_set && memcmp (&dst.ip4, &zero_addr.ip4, sizeof (dst.ip4)) == 0)
- || (ipv6_set
- && memcmp (&dst.ip6, &zero_addr.ip6, sizeof (dst.ip6)) == 0))
+ if (ip46_address_is_ip4 (&src) != ip46_address_is_ip4 (&dst))
{
- error = clib_error_return (0, "dst address cannot be zero");
+ error =
+ clib_error_return (0, "src and dst address must be the same AF");
goto done;
}
- memset (a, 0, sizeof (*a));
+ clib_memset (a, 0, sizeof (*a));
a->is_add = is_add;
- a->outer_fib_id = outer_fib_id;
- a->tunnel_type = t_type;
+ a->outer_table_id = outer_table_id;
+ a->type = t_type;
+ a->mode = t_mode;
a->session_id = session_id;
- a->is_ipv6 = ipv6_set;
+ a->is_ipv6 = !ip46_address_is_ip4 (&src);
a->instance = instance;
- if (!ipv6_set)
- {
- clib_memcpy (&a->src.ip4, &src.ip4, sizeof (src.ip4));
- clib_memcpy (&a->dst.ip4, &dst.ip4, sizeof (dst.ip4));
- }
- else
- {
- clib_memcpy (&a->src.ip6, &src.ip6, sizeof (src.ip6));
- clib_memcpy (&a->dst.ip6, &dst.ip6, sizeof (dst.ip6));
- }
+ clib_memcpy (&a->src, &src, sizeof (a->src));
+ clib_memcpy (&a->dst, &dst, sizeof (a->dst));
- rv = vnet_gre_add_del_tunnel (a, &sw_if_index);
+ rv = vnet_gre_tunnel_add_del (a, &sw_if_index);
switch (rv)
{
error = clib_error_return (0, "GRE tunnel already exists...");
goto done;
case VNET_API_ERROR_NO_SUCH_FIB:
- error = clib_error_return (0, "outer fib ID %d doesn't exist\n",
- outer_fib_id);
+ error = clib_error_return (0, "outer table ID %d doesn't exist\n",
+ outer_table_id);
goto done;
case VNET_API_ERROR_NO_SUCH_ENTRY:
error = clib_error_return (0, "GRE tunnel doesn't exist");
goto done;
default:
error =
- clib_error_return (0, "vnet_gre_add_del_tunnel returned %d", rv);
+ clib_error_return (0, "vnet_gre_tunnel_add_del returned %d", rv);
goto done;
}
};
/* *INDENT-ON* */
+const static nhrp_vft_t gre_nhrp_vft = {
+ .nv_added = gre_nhrp_entry_added,
+ .nv_deleted = gre_nhrp_entry_deleted,
+};
+
/* force inclusion from application's main.c */
clib_error_t *
gre_interface_init (vlib_main_t * vm)
{
- fib_node_register_type (FIB_NODE_TYPE_GRE_TUNNEL, &gre_vft);
+ nhrp_register (&gre_nhrp_vft);
- return 0;
+ return (NULL);
}
VLIB_INIT_FUNCTION (gre_interface_init);
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