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-rw-r--r--src/vnet/bfd/bfd_udp.c639
1 files changed, 639 insertions, 0 deletions
diff --git a/src/vnet/bfd/bfd_udp.c b/src/vnet/bfd/bfd_udp.c
new file mode 100644
index 00000000000..3c747d86a10
--- /dev/null
+++ b/src/vnet/bfd/bfd_udp.c
@@ -0,0 +1,639 @@
+#include <vppinfra/types.h>
+#include <vlibmemory/api.h>
+#include <vlib/vlib.h>
+#include <vlib/buffer.h>
+#include <vnet/ip/format.h>
+#include <vnet/ethernet/packet.h>
+#include <vnet/ip/udp_packet.h>
+#include <vnet/ip/lookup.h>
+#include <vnet/ip/icmp46_packet.h>
+#include <vnet/ip/ip4.h>
+#include <vnet/ip/ip6.h>
+#include <vnet/ip/udp.h>
+#include <vnet/ip/ip6_packet.h>
+#include <vnet/adj/adj.h>
+#include <vnet/adj/adj_nbr.h>
+#include <vnet/bfd/bfd_debug.h>
+#include <vnet/bfd/bfd_udp.h>
+#include <vnet/bfd/bfd_main.h>
+#include <vnet/bfd/bfd_api.h>
+
+typedef struct
+{
+ bfd_main_t *bfd_main;
+ /* hashmap - bfd session index by bfd key - used for CLI/API lookup, where
+ * discriminator is unknown */
+ mhash_t bfd_session_idx_by_bfd_key;
+} bfd_udp_main_t;
+
+static vlib_node_registration_t bfd_udp4_input_node;
+static vlib_node_registration_t bfd_udp6_input_node;
+
+bfd_udp_main_t bfd_udp_main;
+
+void bfd_udp_transport_to_buffer (vlib_main_t *vm, vlib_buffer_t *b,
+ bfd_udp_session_t *bus)
+{
+ udp_header_t *udp;
+ u16 udp_length, ip_length;
+ bfd_udp_key_t *key = &bus->key;
+
+ b->flags |= VNET_BUFFER_LOCALLY_ORIGINATED;
+ if (ip46_address_is_ip4 (&key->local_addr))
+ {
+ ip4_header_t *ip4;
+ const size_t data_size = sizeof (*ip4) + sizeof (*udp);
+ vlib_buffer_advance (b, -data_size);
+ ip4 = vlib_buffer_get_current (b);
+ udp = (udp_header_t *)(ip4 + 1);
+ memset (ip4, 0, data_size);
+ ip4->ip_version_and_header_length = 0x45;
+ ip4->ttl = 255;
+ ip4->protocol = IP_PROTOCOL_UDP;
+ ip4->src_address.as_u32 = key->local_addr.ip4.as_u32;
+ ip4->dst_address.as_u32 = key->peer_addr.ip4.as_u32;
+
+ udp->src_port = clib_host_to_net_u16 (50000); /* FIXME */
+ udp->dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd4);
+
+ /* fix ip length, checksum and udp length */
+ ip_length = vlib_buffer_length_in_chain (vm, b);
+
+ ip4->length = clib_host_to_net_u16 (ip_length);
+ ip4->checksum = ip4_header_checksum (ip4);
+
+ udp_length = ip_length - (sizeof (*ip4));
+ udp->length = clib_host_to_net_u16 (udp_length);
+ }
+ else
+ {
+ BFD_ERR ("not implemented");
+ abort ();
+ }
+}
+
+void bfd_add_udp_transport (vlib_main_t *vm, vlib_buffer_t *b,
+ bfd_udp_session_t *bus)
+{
+ vnet_buffer (b)->ip.adj_index[VLIB_RX] = bus->adj_index;
+ vnet_buffer (b)->ip.adj_index[VLIB_TX] = bus->adj_index;
+ bfd_udp_transport_to_buffer (vm, b, bus);
+}
+
+static bfd_session_t *bfd_lookup_session (bfd_udp_main_t *bum,
+ const bfd_udp_key_t *key)
+{
+ uword *p = mhash_get (&bum->bfd_session_idx_by_bfd_key, key);
+ if (p)
+ {
+ return bfd_find_session_by_idx (bum->bfd_main, *p);
+ }
+ return 0;
+}
+
+static vnet_api_error_t
+bfd_udp_add_session_internal (bfd_udp_main_t *bum, u32 sw_if_index,
+ u32 desired_min_tx_us, u32 required_min_rx_us,
+ u8 detect_mult, const ip46_address_t *local_addr,
+ const ip46_address_t *peer_addr)
+{
+ vnet_sw_interface_t *sw_if =
+ vnet_get_sw_interface (vnet_get_main (), sw_if_index);
+ /* get a pool entry and if we end up not needing it, give it back */
+ bfd_transport_t t = BFD_TRANSPORT_UDP4;
+ if (!ip46_address_is_ip4 (local_addr))
+ {
+ t = BFD_TRANSPORT_UDP6;
+ }
+ bfd_session_t *bs = bfd_get_session (bum->bfd_main, t);
+ bfd_udp_session_t *bus = &bs->udp;
+ memset (bus, 0, sizeof (*bus));
+ bfd_udp_key_t *key = &bus->key;
+ key->sw_if_index = sw_if->sw_if_index;
+ key->local_addr.as_u64[0] = local_addr->as_u64[0];
+ key->local_addr.as_u64[1] = local_addr->as_u64[1];
+ key->peer_addr.as_u64[0] = peer_addr->as_u64[0];
+ key->peer_addr.as_u64[1] = peer_addr->as_u64[1];
+ const bfd_session_t *tmp = bfd_lookup_session (bum, key);
+ if (tmp)
+ {
+ BFD_ERR ("duplicate bfd-udp session, existing bs_idx=%d", tmp->bs_idx);
+ bfd_put_session (bum->bfd_main, bs);
+ return VNET_API_ERROR_BFD_EEXIST;
+ }
+ key->sw_if_index = sw_if->sw_if_index;
+ mhash_set (&bum->bfd_session_idx_by_bfd_key, key, bs->bs_idx, NULL);
+ BFD_DBG ("session created, bs_idx=%u, sw_if_index=%d, local=%U, peer=%U",
+ bs->bs_idx, key->sw_if_index, format_ip46_address, &key->local_addr,
+ IP46_TYPE_ANY, format_ip46_address, &key->peer_addr, IP46_TYPE_ANY);
+ if (BFD_TRANSPORT_UDP4 == t)
+ {
+ bus->adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4, VNET_LINK_IP4,
+ &key->peer_addr, key->sw_if_index);
+ BFD_DBG ("adj_nbr_add_or_lock(FIB_PROTOCOL_IP4, VNET_LINK_IP4, %U, %d) "
+ "returns %d",
+ format_ip46_address, &key->peer_addr, IP46_TYPE_ANY,
+ key->sw_if_index, bus->adj_index);
+ }
+ else
+ {
+ bus->adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP6, VNET_LINK_IP6,
+ &key->peer_addr, key->sw_if_index);
+ BFD_DBG ("adj_nbr_add_or_lock(FIB_PROTOCOL_IP6, VNET_LINK_IP6, %U, %d) "
+ "returns %d",
+ format_ip46_address, &key->peer_addr, IP46_TYPE_ANY,
+ key->sw_if_index, bus->adj_index);
+ }
+ bs->config_desired_min_tx_us = desired_min_tx_us;
+ bs->required_min_rx_us = required_min_rx_us;
+ bs->local_detect_mult = detect_mult;
+ bfd_session_start (bum->bfd_main, bs);
+ return 0;
+}
+
+static vnet_api_error_t
+bfd_udp_validate_api_input (u32 sw_if_index, const ip46_address_t *local_addr,
+ const ip46_address_t *peer_addr)
+{
+ vnet_sw_interface_t *sw_if =
+ vnet_get_sw_interface (vnet_get_main (), sw_if_index);
+ u8 local_ip_valid = 0;
+ ip_interface_address_t *ia = NULL;
+ if (!sw_if)
+ {
+ BFD_ERR ("got NULL sw_if");
+ return VNET_API_ERROR_INVALID_SW_IF_INDEX;
+ }
+ if (ip46_address_is_ip4 (local_addr))
+ {
+ if (!ip46_address_is_ip4 (peer_addr))
+ {
+ BFD_ERR ("IP family mismatch");
+ return VNET_API_ERROR_INVALID_ARGUMENT;
+ }
+ ip4_main_t *im = &ip4_main;
+
+ /* *INDENT-OFF* */
+ foreach_ip_interface_address (
+ &im->lookup_main, ia, sw_if_index, 0 /* honor unnumbered */, ({
+ ip4_address_t *x =
+ ip_interface_address_get_address (&im->lookup_main, ia);
+ if (x->as_u32 == local_addr->ip4.as_u32)
+ {
+ /* valid address for this interface */
+ local_ip_valid = 1;
+ break;
+ }
+ }));
+ /* *INDENT-ON* */
+ }
+ else
+ {
+ if (ip46_address_is_ip4 (peer_addr))
+ {
+ BFD_ERR ("IP family mismatch");
+ return VNET_API_ERROR_INVALID_ARGUMENT;
+ }
+ ip6_main_t *im = &ip6_main;
+ /* *INDENT-OFF* */
+ foreach_ip_interface_address (
+ &im->lookup_main, ia, sw_if_index, 0 /* honor unnumbered */, ({
+ ip6_address_t *x =
+ ip_interface_address_get_address (&im->lookup_main, ia);
+ if (local_addr->ip6.as_u64[0] == x->as_u64[0] &&
+ local_addr->ip6.as_u64[1] == x->as_u64[1])
+ {
+ /* valid address for this interface */
+ local_ip_valid = 1;
+ break;
+ }
+ }));
+ /* *INDENT-ON* */
+ }
+
+ if (!local_ip_valid)
+ {
+ BFD_ERR ("address not found on interface");
+ return VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
+ }
+
+ return 0;
+}
+
+vnet_api_error_t bfd_udp_add_session (u32 sw_if_index, u32 desired_min_tx_us,
+ u32 required_min_rx_us, u8 detect_mult,
+ const ip46_address_t *local_addr,
+ const ip46_address_t *peer_addr)
+{
+ vnet_api_error_t rv =
+ bfd_udp_validate_api_input (sw_if_index, local_addr, peer_addr);
+ if (rv)
+ {
+ return rv;
+ }
+ if (detect_mult < 1)
+ {
+ BFD_ERR ("detect_mult < 1");
+ return VNET_API_ERROR_INVALID_ARGUMENT;
+ }
+ if (desired_min_tx_us < 1)
+ {
+ BFD_ERR ("desired_min_tx_us < 1");
+ return VNET_API_ERROR_INVALID_ARGUMENT;
+ }
+ return bfd_udp_add_session_internal (&bfd_udp_main, sw_if_index,
+ desired_min_tx_us, required_min_rx_us,
+ detect_mult, local_addr, peer_addr);
+}
+
+vnet_api_error_t bfd_udp_del_session (u32 sw_if_index,
+ const ip46_address_t *local_addr,
+ const ip46_address_t *peer_addr)
+{
+ vnet_api_error_t rv =
+ bfd_udp_validate_api_input (sw_if_index, local_addr, peer_addr);
+ if (rv)
+ {
+ return rv;
+ }
+ bfd_udp_main_t *bum = &bfd_udp_main;
+ vnet_sw_interface_t *sw_if =
+ vnet_get_sw_interface (vnet_get_main (), sw_if_index);
+ bfd_udp_key_t key;
+ memset (&key, 0, sizeof (key));
+ key.sw_if_index = sw_if->sw_if_index;
+ key.local_addr.as_u64[0] = local_addr->as_u64[0];
+ key.local_addr.as_u64[1] = local_addr->as_u64[1];
+ key.peer_addr.as_u64[0] = peer_addr->as_u64[0];
+ key.peer_addr.as_u64[1] = peer_addr->as_u64[1];
+ bfd_session_t *tmp = bfd_lookup_session (bum, &key);
+ if (tmp)
+ {
+ BFD_DBG ("free bfd-udp session, bs_idx=%d", tmp->bs_idx);
+ mhash_unset (&bum->bfd_session_idx_by_bfd_key, &key, NULL);
+ adj_unlock (tmp->udp.adj_index);
+ bfd_put_session (bum->bfd_main, tmp);
+ }
+ else
+ {
+ BFD_ERR ("no such session");
+ return VNET_API_ERROR_BFD_NOENT;
+ }
+ return 0;
+}
+
+typedef enum {
+ BFD_UDP_INPUT_NEXT_NORMAL,
+ BFD_UDP_INPUT_NEXT_REPLY,
+ BFD_UDP_INPUT_N_NEXT,
+} bfd_udp_input_next_t;
+
+/* Packet counters */
+#define foreach_bfd_udp_error(F) \
+ F (NONE, "good bfd packets (processed)") \
+ F (BAD, "invalid bfd packets") \
+ F (DISABLED, "bfd packets received on disabled interfaces")
+
+#define F(sym, string) static char BFD_UDP_ERR_##sym##_STR[] = string;
+foreach_bfd_udp_error (F);
+#undef F
+
+static char *bfd_udp_error_strings[] = {
+#define F(sym, string) BFD_UDP_ERR_##sym##_STR,
+ foreach_bfd_udp_error (F)
+#undef F
+};
+
+typedef enum {
+#define F(sym, str) BFD_UDP_ERROR_##sym,
+ foreach_bfd_udp_error (F)
+#undef F
+ BFD_UDP_N_ERROR,
+} bfd_udp_error_t;
+
+static void bfd_udp4_find_headers (vlib_buffer_t *b, const ip4_header_t **ip4,
+ const udp_header_t **udp)
+{
+ /* sanity check first */
+ const i32 start = vnet_buffer (b)->ip.start_of_ip_header;
+ if (start < 0 && start < sizeof (b->pre_data))
+ {
+ BFD_ERR ("Start of ip header is before pre_data, ignoring");
+ *ip4 = NULL;
+ *udp = NULL;
+ return;
+ }
+ *ip4 = (ip4_header_t *)(b->data + start);
+ if ((u8 *)*ip4 > (u8 *)vlib_buffer_get_current (b))
+ {
+ BFD_ERR ("Start of ip header is beyond current data, ignoring");
+ *ip4 = NULL;
+ *udp = NULL;
+ return;
+ }
+ *udp = (udp_header_t *)((*ip4) + 1);
+}
+
+static bfd_udp_error_t bfd_udp4_verify_transport (const ip4_header_t *ip4,
+ const udp_header_t *udp,
+ const bfd_session_t *bs)
+{
+ const bfd_udp_session_t *bus = &bs->udp;
+ const bfd_udp_key_t *key = &bus->key;
+ if (ip4->src_address.as_u32 != key->peer_addr.ip4.as_u32)
+ {
+ BFD_ERR ("IP src addr mismatch, got %U, expected %U", format_ip4_address,
+ ip4->src_address.as_u32, format_ip4_address,
+ key->peer_addr.ip4.as_u32);
+ return BFD_UDP_ERROR_BAD;
+ }
+ if (ip4->dst_address.as_u32 != key->local_addr.ip4.as_u32)
+ {
+ BFD_ERR ("IP dst addr mismatch, got %U, expected %U", format_ip4_address,
+ ip4->dst_address.as_u32, format_ip4_address,
+ key->local_addr.ip4.as_u32);
+ return BFD_UDP_ERROR_BAD;
+ }
+ const u8 expected_ttl = 255;
+ if (ip4->ttl != expected_ttl)
+ {
+ BFD_ERR ("IP unexpected TTL value %d, expected %d", ip4->ttl,
+ expected_ttl);
+ return BFD_UDP_ERROR_BAD;
+ }
+ if (clib_net_to_host_u16 (udp->src_port) < 49152 ||
+ clib_net_to_host_u16 (udp->src_port) > 65535)
+ {
+ BFD_ERR ("Invalid UDP src port %d, out of range <49152,65535>",
+ udp->src_port);
+ }
+ return BFD_UDP_ERROR_NONE;
+}
+
+typedef struct
+{
+ u32 bs_idx;
+ bfd_pkt_t pkt;
+} bfd_rpc_update_t;
+
+static void bfd_rpc_update_session_cb (const bfd_rpc_update_t *a)
+{
+ bfd_consume_pkt (bfd_udp_main.bfd_main, &a->pkt, a->bs_idx);
+}
+
+static void bfd_rpc_update_session (u32 bs_idx, const bfd_pkt_t *pkt)
+{
+ /* packet length was already verified to be correct by the caller */
+ const u32 data_size = sizeof (bfd_rpc_update_t) -
+ STRUCT_SIZE_OF (bfd_rpc_update_t, pkt) +
+ pkt->head.length;
+ u8 data[data_size];
+ bfd_rpc_update_t *update = (bfd_rpc_update_t *)data;
+ update->bs_idx = bs_idx;
+ clib_memcpy (&update->pkt, pkt, pkt->head.length);
+ vl_api_rpc_call_main_thread (bfd_rpc_update_session_cb, data, data_size);
+}
+
+static bfd_udp_error_t bfd_udp4_scan (vlib_main_t *vm, vlib_node_runtime_t *rt,
+ vlib_buffer_t *b, bfd_session_t **bs_out)
+{
+ const bfd_pkt_t *pkt = vlib_buffer_get_current (b);
+ if (sizeof (*pkt) > b->current_length)
+ {
+ BFD_ERR (
+ "Payload size %d too small to hold bfd packet of minimum size %d",
+ b->current_length, sizeof (*pkt));
+ return BFD_UDP_ERROR_BAD;
+ }
+ const ip4_header_t *ip4;
+ const udp_header_t *udp;
+ bfd_udp4_find_headers (b, &ip4, &udp);
+ if (!ip4 || !udp)
+ {
+ BFD_ERR ("Couldn't find ip4 or udp header");
+ return BFD_UDP_ERROR_BAD;
+ }
+ if (!bfd_verify_pkt_common (pkt))
+ {
+ return BFD_UDP_ERROR_BAD;
+ }
+ bfd_session_t *bs = NULL;
+ if (pkt->your_disc)
+ {
+ BFD_DBG ("Looking up BFD session using discriminator %u",
+ pkt->your_disc);
+ bs = bfd_find_session_by_disc (bfd_udp_main.bfd_main, pkt->your_disc);
+ }
+ else
+ {
+ bfd_udp_key_t key;
+ memset (&key, 0, sizeof (key));
+ key.sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
+ key.local_addr.ip4.as_u32 = ip4->dst_address.as_u32;
+ key.peer_addr.ip4.as_u32 = ip4->src_address.as_u32;
+ BFD_DBG ("Looking up BFD session using key (sw_if_index=%u, local=%U, "
+ "peer=%U)",
+ key.sw_if_index, format_ip4_address, key.local_addr.ip4.as_u8,
+ format_ip4_address, key.peer_addr.ip4.as_u8);
+ bs = bfd_lookup_session (&bfd_udp_main, &key);
+ }
+ if (!bs)
+ {
+ BFD_ERR ("BFD session lookup failed - no session matches BFD pkt");
+ return BFD_UDP_ERROR_BAD;
+ }
+ BFD_DBG ("BFD session found, bs_idx=%u", bs->bs_idx);
+ if (!bfd_verify_pkt_session (pkt, b->current_length, bs))
+ {
+ return BFD_UDP_ERROR_BAD;
+ }
+ bfd_udp_error_t err;
+ if (BFD_UDP_ERROR_NONE != (err = bfd_udp4_verify_transport (ip4, udp, bs)))
+ {
+ return err;
+ }
+ bfd_rpc_update_session (bs->bs_idx, pkt);
+ *bs_out = bs;
+ return BFD_UDP_ERROR_NONE;
+}
+
+static bfd_udp_error_t bfd_udp6_scan (vlib_main_t *vm, vlib_buffer_t *b)
+{
+ /* TODO */
+ return BFD_UDP_ERROR_BAD;
+}
+
+/*
+ * Process a frame of bfd packets
+ * Expect 1 packet / frame
+ */
+static uword bfd_udp_input (vlib_main_t *vm, vlib_node_runtime_t *rt,
+ vlib_frame_t *f, int is_ipv6)
+{
+ u32 n_left_from, *from;
+ bfd_input_trace_t *t0;
+
+ from = vlib_frame_vector_args (f); /* array of buffer indices */
+ n_left_from = f->n_vectors; /* number of buffer indices */
+
+ while (n_left_from > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 next0, error0;
+
+ bi0 = from[0];
+ b0 = vlib_get_buffer (vm, bi0);
+
+ bfd_session_t *bs = NULL;
+
+ /* If this pkt is traced, snapshot the data */
+ if (b0->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ int len;
+ t0 = vlib_add_trace (vm, rt, b0, sizeof (*t0));
+ len = (b0->current_length < sizeof (t0->data)) ? b0->current_length
+ : sizeof (t0->data);
+ t0->len = len;
+ clib_memcpy (t0->data, vlib_buffer_get_current (b0), len);
+ }
+
+ /* scan this bfd pkt. error0 is the counter index to bmp */
+ if (is_ipv6)
+ {
+ error0 = bfd_udp6_scan (vm, b0);
+ }
+ else
+ {
+ error0 = bfd_udp4_scan (vm, rt, b0, &bs);
+ }
+ b0->error = rt->errors[error0];
+
+ next0 = BFD_UDP_INPUT_NEXT_NORMAL;
+ if (BFD_UDP_ERROR_NONE == error0)
+ {
+ /* if everything went fine, check for poll bit, if present, re-use
+ the buffer and based on (now updated) session parameters, send the
+ final packet back */
+ const bfd_pkt_t *pkt = vlib_buffer_get_current (b0);
+ if (bfd_pkt_get_poll (pkt))
+ {
+ bfd_send_final (vm, b0, bs);
+ if (is_ipv6)
+ {
+ vlib_node_increment_counter (vm, bfd_udp6_input_node.index,
+ b0->error, 1);
+ }
+ else
+ {
+ vlib_node_increment_counter (vm, bfd_udp4_input_node.index,
+ b0->error, 1);
+ }
+ next0 = BFD_UDP_INPUT_NEXT_REPLY;
+ }
+ }
+ vlib_set_next_frame_buffer (vm, rt, next0, bi0);
+
+ from += 1;
+ n_left_from -= 1;
+ }
+
+ return f->n_vectors;
+}
+
+static uword bfd_udp4_input (vlib_main_t *vm, vlib_node_runtime_t *rt,
+ vlib_frame_t *f)
+{
+ return bfd_udp_input (vm, rt, f, 0);
+}
+
+/*
+ * bfd input graph node declaration
+ */
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (bfd_udp4_input_node, static) = {
+ .function = bfd_udp4_input,
+ .name = "bfd-udp4-input",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = BFD_UDP_N_ERROR,
+ .error_strings = bfd_udp_error_strings,
+
+ .format_trace = bfd_input_format_trace,
+
+ .n_next_nodes = BFD_UDP_INPUT_N_NEXT,
+ .next_nodes =
+ {
+ [BFD_UDP_INPUT_NEXT_NORMAL] = "error-drop",
+ [BFD_UDP_INPUT_NEXT_REPLY] = "ip4-lookup",
+ },
+};
+/* *INDENT-ON* */
+
+static uword bfd_udp6_input (vlib_main_t *vm, vlib_node_runtime_t *rt,
+ vlib_frame_t *f)
+{
+ return bfd_udp_input (vm, rt, f, 1);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (bfd_udp6_input_node, static) = {
+ .function = bfd_udp6_input,
+ .name = "bfd-udp6-input",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = BFD_UDP_N_ERROR,
+ .error_strings = bfd_udp_error_strings,
+
+ .format_trace = bfd_input_format_trace,
+
+ .n_next_nodes = BFD_UDP_INPUT_N_NEXT,
+ .next_nodes =
+ {
+ [BFD_UDP_INPUT_NEXT_NORMAL] = "error-drop",
+ [BFD_UDP_INPUT_NEXT_REPLY] = "ip6-lookup",
+ },
+};
+/* *INDENT-ON* */
+
+static clib_error_t *bfd_sw_interface_up_down (vnet_main_t *vnm,
+ u32 sw_if_index, u32 flags)
+{
+ // vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
+ if (!(flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
+ {
+ /* TODO */
+ }
+ return 0;
+}
+
+VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (bfd_sw_interface_up_down);
+
+static clib_error_t *bfd_hw_interface_up_down (vnet_main_t *vnm,
+ u32 hw_if_index, u32 flags)
+{
+ if (flags & VNET_HW_INTERFACE_FLAG_LINK_UP)
+ {
+ /* TODO */
+ }
+ return 0;
+}
+
+VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION (bfd_hw_interface_up_down);
+
+/*
+ * setup function
+ */
+static clib_error_t *bfd_udp_init (vlib_main_t *vm)
+{
+ mhash_init (&bfd_udp_main.bfd_session_idx_by_bfd_key, sizeof (uword),
+ sizeof (bfd_udp_key_t));
+ bfd_udp_main.bfd_main = &bfd_main;
+ udp_register_dst_port (vm, UDP_DST_PORT_bfd4, bfd_udp4_input_node.index, 1);
+ udp_register_dst_port (vm, UDP_DST_PORT_bfd6, bfd_udp6_input_node.index, 0);
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (bfd_udp_init);