diff options
Diffstat (limited to 'src/vnet/bfd/bfd_udp.c')
| -rw-r--r-- | src/vnet/bfd/bfd_udp.c | 1516 |
1 files changed, 1516 insertions, 0 deletions
diff --git a/src/vnet/bfd/bfd_udp.c b/src/vnet/bfd/bfd_udp.c new file mode 100644 index 00000000..533d98d6 --- /dev/null +++ b/src/vnet/bfd/bfd_udp.c @@ -0,0 +1,1516 @@ +/* + * Copyright (c) 2011-2016 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. + */ +/** + * @file + * @brief BFD UDP transport layer implementation + */ +#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/udp/udp_packet.h> +#include <vnet/udp/udp.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/ip6_packet.h> +#include <vnet/adj/adj.h> +#include <vnet/adj/adj_nbr.h> +#include <vnet/dpo/receive_dpo.h> +#include <vnet/fib/fib_entry.h> +#include <vnet/fib/fib_table.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; + /* convenience variable */ + vnet_main_t *vnet_main; + /* flag indicating whether echo_source_sw_if_index holds a valid value */ + int echo_source_is_set; + /* loopback interface used to get echo source ip */ + u32 echo_source_sw_if_index; + /* node index of "ip4-arp" node */ + u32 ip4_arp_idx; + /* node index of "ip6-discover-neighbor" node */ + u32 ip6_ndp_idx; + /* node index of "ip4-rewrite" node */ + u32 ip4_rewrite_idx; + /* node index of "ip6-rewrite" node */ + u32 ip6_rewrite_idx; +} bfd_udp_main_t; + +static vlib_node_registration_t bfd_udp4_input_node; +static vlib_node_registration_t bfd_udp6_input_node; +static vlib_node_registration_t bfd_udp_echo4_input_node; +static vlib_node_registration_t bfd_udp_echo6_input_node; + +bfd_udp_main_t bfd_udp_main; + +vnet_api_error_t +bfd_udp_set_echo_source (u32 sw_if_index) +{ + vnet_sw_interface_t *sw_if = + vnet_get_sw_interface_safe (bfd_udp_main.vnet_main, sw_if_index); + if (sw_if) + { + bfd_udp_main.echo_source_sw_if_index = sw_if_index; + bfd_udp_main.echo_source_is_set = 1; + return 0; + } + return VNET_API_ERROR_BFD_ENOENT; +} + +vnet_api_error_t +bfd_udp_del_echo_source (u32 sw_if_index) +{ + bfd_udp_main.echo_source_sw_if_index = ~0; + bfd_udp_main.echo_source_is_set = 0; + return 0; +} + +int +bfd_udp_is_echo_available (bfd_transport_e transport) +{ + if (!bfd_udp_main.echo_source_is_set) + { + BFD_DBG ("UDP echo source not set - echo not available"); + return 0; + } + /* + * for the echo to work, we need a loopback interface with at least one + * address with netmask length at most 31 (ip4) or 127 (ip6) so that we can + * pick an unused address from that subnet + */ + vnet_sw_interface_t *sw_if = + vnet_get_sw_interface_safe (bfd_udp_main.vnet_main, + bfd_udp_main.echo_source_sw_if_index); + if (sw_if && sw_if->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) + { + if (BFD_TRANSPORT_UDP4 == transport) + { + ip4_main_t *im = &ip4_main; + ip_interface_address_t *ia = NULL; + /* *INDENT-OFF* */ + foreach_ip_interface_address (&im->lookup_main, ia, + bfd_udp_main.echo_source_sw_if_index, + 0 /* honor unnumbered */, ({ + if (ia->address_length <= 31) + { + return 1; + } + })); + /* *INDENT-ON* */ + } + else if (BFD_TRANSPORT_UDP6 == transport) + { + ip6_main_t *im = &ip6_main; + ip_interface_address_t *ia = NULL; + /* *INDENT-OFF* */ + foreach_ip_interface_address (&im->lookup_main, ia, + bfd_udp_main.echo_source_sw_if_index, + 0 /* honor unnumbered */, ({ + if (ia->address_length <= 127) + { + return 1; + } + })); + /* *INDENT-ON* */ + } + } + BFD_DBG ("No usable IP address for UDP echo - echo not available"); + return 0; +} + +static u16 +bfd_udp_bs_idx_to_sport (u32 bs_idx) +{ + /* The source port MUST be in the range 49152 through 65535. The same UDP + * source port number MUST be used for all BFD Control packets associated + * with a particular session. The source port number SHOULD be unique among + * all BFD sessions on the system. If more than 16384 BFD sessions are + * simultaneously active, UDP source port numbers MAY be reused on + * multiple sessions, but the number of distinct uses of the same UDP + * source port number SHOULD be minimized. + */ + return 49152 + bs_idx % (65535 - 49152 + 1); +} + +int +bfd_udp_get_echo_src_ip4 (ip4_address_t * addr) +{ + if (!bfd_udp_main.echo_source_is_set) + { + BFD_ERR ("cannot find ip4 address, echo source not set"); + return 0; + } + ip_interface_address_t *ia = NULL; + ip4_main_t *im = &ip4_main; + + /* *INDENT-OFF* */ + foreach_ip_interface_address ( + &im->lookup_main, ia, bfd_udp_main.echo_source_sw_if_index, + 0 /* honor unnumbered */, ({ + ip4_address_t *x = + ip_interface_address_get_address (&im->lookup_main, ia); + if (ia->address_length <= 31) + { + addr->as_u32 = clib_host_to_net_u32 (x->as_u32); + /* + * flip the last bit to get a different address, might be network, + * we don't care ... + */ + addr->as_u32 ^= 1; + addr->as_u32 = clib_net_to_host_u32 (addr->as_u32); + return 1; + } + })); + /* *INDENT-ON* */ + BFD_ERR ("cannot find ip4 address, no usable address found"); + return 0; +} + +int +bfd_udp_get_echo_src_ip6 (ip6_address_t * addr) +{ + if (!bfd_udp_main.echo_source_is_set) + { + BFD_ERR ("cannot find ip6 address, echo source not set"); + return 0; + } + ip_interface_address_t *ia = NULL; + ip6_main_t *im = &ip6_main; + + /* *INDENT-OFF* */ + foreach_ip_interface_address ( + &im->lookup_main, ia, bfd_udp_main.echo_source_sw_if_index, + 0 /* honor unnumbered */, ({ + ip6_address_t *x = + ip_interface_address_get_address (&im->lookup_main, ia); + if (ia->address_length <= 127) + { + *addr = *x; + addr->as_u8[15] ^= 1; /* flip the last bit of the address */ + return 1; + } + })); + /* *INDENT-ON* */ + BFD_ERR ("cannot find ip6 address, no usable address found"); + return 0; +} + +void +bfd_udp_get_echo_source (int *is_set, u32 * sw_if_index, + int *have_usable_ip4, ip4_address_t * ip4, + int *have_usable_ip6, ip6_address_t * ip6) +{ + if (bfd_udp_main.echo_source_is_set) + { + *is_set = 1; + *sw_if_index = bfd_udp_main.echo_source_sw_if_index; + *have_usable_ip4 = bfd_udp_get_echo_src_ip4 (ip4); + *have_usable_ip6 = bfd_udp_get_echo_src_ip6 (ip6); + } + else + { + *is_set = 0; + } +} + +int +bfd_add_udp4_transport (vlib_main_t * vm, u32 bi, const bfd_session_t * bs, + int is_echo) +{ + const bfd_udp_session_t *bus = &bs->udp; + const bfd_udp_key_t *key = &bus->key; + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + + b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; + vnet_buffer (b)->ip.adj_index[VLIB_RX] = bus->adj_index; + vnet_buffer (b)->ip.adj_index[VLIB_TX] = bus->adj_index; + vnet_buffer (b)->sw_if_index[VLIB_RX] = 0; + vnet_buffer (b)->sw_if_index[VLIB_TX] = ~0; + typedef struct + { + ip4_header_t ip4; + udp_header_t udp; + } ip4_udp_headers; + ip4_udp_headers *headers = NULL; + vlib_buffer_advance (b, -sizeof (*headers)); + headers = vlib_buffer_get_current (b); + memset (headers, 0, sizeof (*headers)); + headers->ip4.ip_version_and_header_length = 0x45; + headers->ip4.ttl = 255; + headers->ip4.protocol = IP_PROTOCOL_UDP; + headers->udp.src_port = + clib_host_to_net_u16 (bfd_udp_bs_idx_to_sport (bs->bs_idx)); + if (is_echo) + { + int rv; + if (!(rv = bfd_udp_get_echo_src_ip4 (&headers->ip4.src_address))) + { + return rv; + } + headers->ip4.dst_address.as_u32 = key->local_addr.ip4.as_u32; + headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd_echo4); + } + else + { + headers->ip4.src_address.as_u32 = key->local_addr.ip4.as_u32; + headers->ip4.dst_address.as_u32 = key->peer_addr.ip4.as_u32; + headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd4); + } + + /* fix ip length, checksum and udp length */ + const u16 ip_length = vlib_buffer_length_in_chain (vm, b); + + headers->ip4.length = clib_host_to_net_u16 (ip_length); + headers->ip4.checksum = ip4_header_checksum (&headers->ip4); + + const u16 udp_length = ip_length - (sizeof (headers->ip4)); + headers->udp.length = clib_host_to_net_u16 (udp_length); + return 1; +} + +int +bfd_add_udp6_transport (vlib_main_t * vm, u32 bi, const bfd_session_t * bs, + int is_echo) +{ + const bfd_udp_session_t *bus = &bs->udp; + const bfd_udp_key_t *key = &bus->key; + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + + b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; + vnet_buffer (b)->ip.adj_index[VLIB_RX] = bus->adj_index; + vnet_buffer (b)->ip.adj_index[VLIB_TX] = bus->adj_index; + vnet_buffer (b)->sw_if_index[VLIB_RX] = 0; + vnet_buffer (b)->sw_if_index[VLIB_TX] = 0; + typedef struct + { + ip6_header_t ip6; + udp_header_t udp; + } ip6_udp_headers; + ip6_udp_headers *headers = NULL; + vlib_buffer_advance (b, -sizeof (*headers)); + headers = vlib_buffer_get_current (b); + memset (headers, 0, sizeof (*headers)); + headers->ip6.ip_version_traffic_class_and_flow_label = + clib_host_to_net_u32 (0x6 << 28); + headers->ip6.hop_limit = 255; + headers->ip6.protocol = IP_PROTOCOL_UDP; + headers->udp.src_port = + clib_host_to_net_u16 (bfd_udp_bs_idx_to_sport (bs->bs_idx)); + if (is_echo) + { + int rv; + if (!(rv = bfd_udp_get_echo_src_ip6 (&headers->ip6.src_address))) + { + return rv; + } + clib_memcpy (&headers->ip6.dst_address, &key->local_addr.ip6, + sizeof (headers->ip6.dst_address)); + + headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd_echo6); + } + else + { + clib_memcpy (&headers->ip6.src_address, &key->local_addr.ip6, + sizeof (headers->ip6.src_address)); + clib_memcpy (&headers->ip6.dst_address, &key->peer_addr.ip6, + sizeof (headers->ip6.dst_address)); + headers->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_bfd6); + } + + /* fix ip payload length and udp length */ + const u16 udp_length = + vlib_buffer_length_in_chain (vm, b) - (sizeof (headers->ip6)); + headers->udp.length = clib_host_to_net_u16 (udp_length); + headers->ip6.payload_length = headers->udp.length; + + /* IPv6 UDP checksum is mandatory */ + int bogus = 0; + headers->udp.checksum = + ip6_tcp_udp_icmp_compute_checksum (vm, b, &headers->ip6, &bogus); + ASSERT (bogus == 0); + if (headers->udp.checksum == 0) + { + headers->udp.checksum = 0xffff; + } + return 1; +} + +static void +bfd_create_frame_to_next_node (vlib_main_t * vm, u32 bi, u32 next_node) +{ + vlib_frame_t *f = vlib_get_frame_to_node (vm, next_node); + u32 *to_next = vlib_frame_vector_args (f); + to_next[0] = bi; + f->n_vectors = 1; + vlib_put_frame_to_node (vm, next_node, f); +} + +int +bfd_udp_calc_next_node (const struct bfd_session_s *bs, u32 * next_node) +{ + const bfd_udp_session_t *bus = &bs->udp; + ip_adjacency_t *adj = adj_get (bus->adj_index); + switch (adj->lookup_next_index) + { + case IP_LOOKUP_NEXT_ARP: + switch (bs->transport) + { + case BFD_TRANSPORT_UDP4: + *next_node = bfd_udp_main.ip4_arp_idx; + return 1; + case BFD_TRANSPORT_UDP6: + *next_node = bfd_udp_main.ip6_ndp_idx; + return 1; + } + break; + case IP_LOOKUP_NEXT_REWRITE: + switch (bs->transport) + { + case BFD_TRANSPORT_UDP4: + *next_node = bfd_udp_main.ip4_rewrite_idx; + return 1; + case BFD_TRANSPORT_UDP6: + *next_node = bfd_udp_main.ip6_rewrite_idx; + return 1; + } + break; + default: + /* drop */ + break; + } + return 0; +} + +int +bfd_transport_udp4 (vlib_main_t * vm, u32 bi, const struct bfd_session_s *bs) +{ + u32 next_node; + int rv = bfd_udp_calc_next_node (bs, &next_node); + if (rv) + { + bfd_create_frame_to_next_node (vm, bi, next_node); + } + return rv; +} + +int +bfd_transport_udp6 (vlib_main_t * vm, u32 bi, const struct bfd_session_s *bs) +{ + u32 next_node; + int rv = bfd_udp_calc_next_node (bs, &next_node); + if (rv) + { + bfd_create_frame_to_next_node (vm, bi, next_node); + } + return 1; +} + +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 void +bfd_udp_key_init (bfd_udp_key_t * key, u32 sw_if_index, + const ip46_address_t * local_addr, + const ip46_address_t * peer_addr) +{ + memset (key, 0, sizeof (*key)); + key->sw_if_index = 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]; +} + +static vnet_api_error_t +bfd_udp_add_session_internal (bfd_udp_main_t * bum, u32 sw_if_index, + u32 desired_min_tx_usec, + u32 required_min_rx_usec, u8 detect_mult, + const ip46_address_t * local_addr, + const ip46_address_t * peer_addr, + bfd_session_t ** bs_out) +{ + /* get a pool entry and if we end up not needing it, give it back */ + bfd_transport_e 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); + if (!bs) + { + bfd_put_session (bum->bfd_main, bs); + return VNET_API_ERROR_BFD_EAGAIN; + } + bfd_udp_session_t *bus = &bs->udp; + memset (bus, 0, sizeof (*bus)); + bfd_udp_key_t *key = &bus->key; + bfd_udp_key_init (key, sw_if_index, local_addr, peer_addr); + const bfd_session_t *tmp = bfd_lookup_session (bum, key); + if (tmp) + { + clib_warning ("duplicate bfd-udp session, existing bs_idx=%d", + tmp->bs_idx); + bfd_put_session (bum->bfd_main, bs); + return VNET_API_ERROR_BFD_EEXIST; + } + 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_out = bs; + return bfd_session_set_params (bum->bfd_main, bs, desired_min_tx_usec, + required_min_rx_usec, detect_mult); +} + +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_safe (bfd_udp_main.vnet_main, sw_if_index); + u8 local_ip_valid = 0; + ip_interface_address_t *ia = NULL; + if (!sw_if) + { + clib_warning ("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)) + { + clib_warning ("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)) + { + clib_warning ("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) + { + clib_warning ("address not found on interface"); + return VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE; + } + + return 0; +} + +static vnet_api_error_t +bfd_udp_find_session_by_api_input (u32 sw_if_index, + const ip46_address_t * local_addr, + const ip46_address_t * peer_addr, + bfd_session_t ** bs_out) +{ + vnet_api_error_t rv = + bfd_udp_validate_api_input (sw_if_index, local_addr, peer_addr); + if (!rv) + { + bfd_udp_main_t *bum = &bfd_udp_main; + bfd_udp_key_t key; + bfd_udp_key_init (&key, sw_if_index, local_addr, peer_addr); + bfd_session_t *bs = bfd_lookup_session (bum, &key); + if (bs) + { + *bs_out = bs; + } + else + { + clib_warning + ("BFD session not found (sw_if_index=%u, local=%U, peer=%U", + sw_if_index, format_ip46_address, local_addr, IP46_TYPE_ANY, + format_ip46_address, peer_addr, IP46_TYPE_ANY); + return VNET_API_ERROR_BFD_ENOENT; + } + } + return rv; +} + +static vnet_api_error_t +bfd_api_verify_common (u32 sw_if_index, u32 desired_min_tx_usec, + u32 required_min_rx_usec, 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) + { + clib_warning ("detect_mult < 1"); + return VNET_API_ERROR_INVALID_ARGUMENT; + } + if (desired_min_tx_usec < 1) + { + clib_warning ("desired_min_tx_usec < 1"); + return VNET_API_ERROR_INVALID_ARGUMENT; + } + return 0; +} + +static void +bfd_udp_del_session_internal (bfd_session_t * bs) +{ + bfd_udp_main_t *bum = &bfd_udp_main; + BFD_DBG ("free bfd-udp session, bs_idx=%d", bs->bs_idx); + mhash_unset (&bum->bfd_session_idx_by_bfd_key, &bs->udp.key, NULL); + adj_unlock (bs->udp.adj_index); + bfd_put_session (bum->bfd_main, bs); +} + +vnet_api_error_t +bfd_udp_add_session (u32 sw_if_index, const ip46_address_t * local_addr, + const ip46_address_t * peer_addr, + u32 desired_min_tx_usec, u32 required_min_rx_usec, + u8 detect_mult, u8 is_authenticated, u32 conf_key_id, + u8 bfd_key_id) +{ + vnet_api_error_t rv = + bfd_api_verify_common (sw_if_index, desired_min_tx_usec, + required_min_rx_usec, detect_mult, + local_addr, peer_addr); + bfd_session_t *bs = NULL; + if (!rv) + { + rv = + bfd_udp_add_session_internal (&bfd_udp_main, sw_if_index, + desired_min_tx_usec, + required_min_rx_usec, detect_mult, + local_addr, peer_addr, &bs); + } + if (!rv && is_authenticated) + { +#if WITH_LIBSSL > 0 + rv = bfd_auth_activate (bs, conf_key_id, bfd_key_id, + 0 /* is not delayed */ ); +#else + clib_warning ("SSL missing, cannot add authenticated BFD session"); + rv = VNET_API_ERROR_BFD_NOTSUPP; +#endif + if (rv) + { + bfd_udp_del_session_internal (bs); + } + } + if (!rv) + { + bfd_session_start (bfd_udp_main.bfd_main, bs); + } + + return rv; +} + +vnet_api_error_t +bfd_udp_mod_session (u32 sw_if_index, + const ip46_address_t * local_addr, + const ip46_address_t * peer_addr, + u32 desired_min_tx_usec, + u32 required_min_rx_usec, u8 detect_mult) +{ + bfd_session_t *bs = NULL; + vnet_api_error_t rv = + bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr, + &bs); + if (rv) + { + return rv; + } + + return bfd_session_set_params (bfd_udp_main.bfd_main, bs, + desired_min_tx_usec, required_min_rx_usec, + detect_mult); +} + +vnet_api_error_t +bfd_udp_del_session (u32 sw_if_index, + const ip46_address_t * local_addr, + const ip46_address_t * peer_addr) +{ + bfd_session_t *bs = NULL; + vnet_api_error_t rv = + bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr, + &bs); + if (rv) + { + return rv; + } + bfd_udp_del_session_internal (bs); + return 0; +} + +vnet_api_error_t +bfd_udp_session_set_flags (u32 sw_if_index, + const ip46_address_t * local_addr, + const ip46_address_t * peer_addr, u8 admin_up_down) +{ + bfd_session_t *bs = NULL; + vnet_api_error_t rv = + bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr, + &bs); + if (rv) + { + return rv; + } + bfd_session_set_flags (bs, admin_up_down); + return 0; +} + +vnet_api_error_t +bfd_udp_auth_activate (u32 sw_if_index, + const ip46_address_t * local_addr, + const ip46_address_t * peer_addr, + u32 conf_key_id, u8 key_id, u8 is_delayed) +{ +#if WITH_LIBSSL > 0 + bfd_session_t *bs = NULL; + vnet_api_error_t rv = + bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr, + &bs); + if (rv) + { + return rv; + } + return bfd_auth_activate (bs, conf_key_id, key_id, is_delayed); +#else + clib_warning ("SSL missing, cannot activate BFD authentication"); + return VNET_API_ERROR_BFD_NOTSUPP; +#endif +} + +vnet_api_error_t +bfd_udp_auth_deactivate (u32 sw_if_index, + const ip46_address_t * local_addr, + const ip46_address_t * peer_addr, u8 is_delayed) +{ + bfd_session_t *bs = NULL; + vnet_api_error_t rv = + bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr, + &bs); + if (rv) + { + return rv; + } + return bfd_auth_deactivate (bs, is_delayed); +} + +typedef enum +{ + BFD_UDP_INPUT_NEXT_NORMAL, + BFD_UDP_INPUT_NEXT_REPLY_ARP, + BFD_UDP_INPUT_NEXT_REPLY_REWRITE, + BFD_UDP_INPUT_N_NEXT, +} bfd_udp_input_next_t; + +/* Packet counters - BFD control frames */ +#define foreach_bfd_udp_error(F) \ + F (NONE, "good bfd packets (processed)") \ + F (BAD, "invalid bfd packets") + +#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; + +/* Packet counters - BFD ECHO packets */ +#define foreach_bfd_udp_echo_error(F) \ + F (NONE, "good bfd echo packets (processed)") \ + F (BAD, "invalid bfd echo packets") + +#define F(sym, string) static char BFD_UDP_ECHO_ERR_##sym##_STR[] = string; +foreach_bfd_udp_echo_error (F); +#undef F + +static char *bfd_udp_echo_error_strings[] = { +#define F(sym, string) BFD_UDP_ECHO_ERR_##sym##_STR, + foreach_bfd_udp_echo_error (F) +#undef F +}; + +typedef enum +{ +#define F(sym, str) BFD_UDP_ECHO_ERROR_##sym, + foreach_bfd_udp_echo_error (F) +#undef F + BFD_UDP_ECHO_N_ERROR, +} bfd_udp_echo_error_t; + +static void +bfd_udp4_find_headers (vlib_buffer_t * b, ip4_header_t ** ip4, + udp_header_t ** udp) +{ + /* sanity check first */ + const i32 start = vnet_buffer (b)->l3_hdr_offset; + 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 ("IPv4 src addr mismatch, got %U, expected %U", + format_ip4_address, ip4->src_address.as_u8, format_ip4_address, + key->peer_addr.ip4.as_u8); + return BFD_UDP_ERROR_BAD; + } + if (ip4->dst_address.as_u32 != key->local_addr.ip4.as_u32) + { + BFD_ERR ("IPv4 dst addr mismatch, got %U, expected %U", + format_ip4_address, ip4->dst_address.as_u8, format_ip4_address, + key->local_addr.ip4.as_u8); + return BFD_UDP_ERROR_BAD; + } + const u8 expected_ttl = 255; + if (ip4->ttl != expected_ttl) + { + BFD_ERR ("IPv4 unexpected TTL value %u, expected %u", ip4->ttl, + expected_ttl); + return BFD_UDP_ERROR_BAD; + } + if (clib_net_to_host_u16 (udp->src_port) < 49152) + { + BFD_ERR ("Invalid UDP src port %u, 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; + } + ip4_header_t *ip4; + 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; + } + const u32 udp_payload_length = udp->length - sizeof (*udp); + if (pkt->head.length > udp_payload_length) + { + BFD_ERR + ("BFD packet length is larger than udp payload length (%u > %u)", + pkt->head.length, udp_payload_length); + 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_auth (pkt, b->current_length, bs)) + { + BFD_ERR ("Packet verification failed, dropping packet"); + 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 void +bfd_udp6_find_headers (vlib_buffer_t * b, ip6_header_t ** ip6, + udp_header_t ** udp) +{ + /* sanity check first */ + const i32 start = vnet_buffer (b)->l3_hdr_offset; + if (start < 0 && start < sizeof (b->pre_data)) + { + BFD_ERR ("Start of ip header is before pre_data, ignoring"); + *ip6 = NULL; + *udp = NULL; + return; + } + *ip6 = (ip6_header_t *) (b->data + start); + if ((u8 *) * ip6 > (u8 *) vlib_buffer_get_current (b)) + { + BFD_ERR ("Start of ip header is beyond current data, ignoring"); + *ip6 = NULL; + *udp = NULL; + return; + } + if ((*ip6)->protocol != IP_PROTOCOL_UDP) + { + BFD_ERR ("Unexpected protocol in IPv6 header '%u', expected '%u' (== " + "IP_PROTOCOL_UDP)", (*ip6)->protocol, IP_PROTOCOL_UDP); + *ip6 = NULL; + *udp = NULL; + return; + } + *udp = (udp_header_t *) ((*ip6) + 1); +} + +static bfd_udp_error_t +bfd_udp6_verify_transport (const ip6_header_t * ip6, + 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 (ip6->src_address.as_u64[0] != key->peer_addr.ip6.as_u64[0] && + ip6->src_address.as_u64[1] != key->peer_addr.ip6.as_u64[1]) + { + BFD_ERR ("IP src addr mismatch, got %U, expected %U", + format_ip6_address, ip6, format_ip6_address, + &key->peer_addr.ip6); + return BFD_UDP_ERROR_BAD; + } + if (ip6->dst_address.as_u64[0] != key->local_addr.ip6.as_u64[0] && + ip6->dst_address.as_u64[1] != key->local_addr.ip6.as_u64[1]) + { + BFD_ERR ("IP dst addr mismatch, got %U, expected %U", + format_ip6_address, ip6, format_ip6_address, + &key->local_addr.ip6); + return BFD_UDP_ERROR_BAD; + } + const u8 expected_hop_limit = 255; + if (ip6->hop_limit != expected_hop_limit) + { + BFD_ERR ("IPv6 unexpected hop-limit value %u, expected %u", + ip6->hop_limit, expected_hop_limit); + return BFD_UDP_ERROR_BAD; + } + if (clib_net_to_host_u16 (udp->src_port) < 49152) + { + BFD_ERR ("Invalid UDP src port %u, out of range <49152,65535>", + udp->src_port); + } + return BFD_UDP_ERROR_NONE; +} + +static bfd_udp_error_t +bfd_udp6_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; + } + ip6_header_t *ip6; + udp_header_t *udp; + bfd_udp6_find_headers (b, &ip6, &udp); + if (!ip6 || !udp) + { + BFD_ERR ("Couldn't find ip6 or udp header"); + return BFD_UDP_ERROR_BAD; + } + const u32 udp_payload_length = udp->length - sizeof (*udp); + if (pkt->head.length > udp_payload_length) + { + BFD_ERR + ("BFD packet length is larger than udp payload length (%u > %u)", + pkt->head.length, udp_payload_length); + 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.ip6.as_u64[0] = ip6->dst_address.as_u64[0]; + key.local_addr.ip6.as_u64[1] = ip6->dst_address.as_u64[1]; + key.peer_addr.ip6.as_u64[0] = ip6->src_address.as_u64[0]; + key.peer_addr.ip6.as_u64[1] = ip6->src_address.as_u64[1]; + BFD_DBG ("Looking up BFD session using key (sw_if_index=%u, local=%U, " + "peer=%U)", + key.sw_if_index, format_ip6_address, &key.local_addr, + format_ip6_address, &key.peer_addr); + 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_auth (pkt, b->current_length, bs)) + { + BFD_ERR ("Packet verification failed, dropping packet"); + return BFD_UDP_ERROR_BAD; + } + bfd_udp_error_t err; + if (BFD_UDP_ERROR_NONE != (err = bfd_udp6_verify_transport (ip6, udp, bs))) + { + return err; + } + bfd_rpc_update_session (bs->bs_idx, pkt); + *bs_out = bs; + return BFD_UDP_ERROR_NONE; +} + +/* + * 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, rt, b0, &bs); + } + 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)) + { + b0->current_data = 0; + b0->current_length = 0; + memset (vnet_buffer (b0), 0, sizeof (*vnet_buffer (b0))); + bfd_init_final_control_frame (vm, b0, bfd_udp_main.bfd_main, bs, + 0); + 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); + } + const bfd_udp_session_t *bus = &bs->udp; + ip_adjacency_t *adj = adj_get (bus->adj_index); + switch (adj->lookup_next_index) + { + case IP_LOOKUP_NEXT_ARP: + next0 = BFD_UDP_INPUT_NEXT_REPLY_ARP; + break; + case IP_LOOKUP_NEXT_REWRITE: + next0 = BFD_UDP_INPUT_NEXT_REPLY_REWRITE; + break; + default: + /* drop */ + break; + } + } + } + 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_ARP] = "ip4-arp", + [BFD_UDP_INPUT_NEXT_REPLY_REWRITE] = "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_ARP] = "ip6-discover-neighbor", + [BFD_UDP_INPUT_NEXT_REPLY_REWRITE] = "ip6-lookup", + }, +}; +/* *INDENT-ON* */ + +/* + * Process a frame of bfd echo packets + * Expect 1 packet / frame + */ +static uword +bfd_udp_echo_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; + + bi0 = from[0]; + b0 = vlib_get_buffer (vm, bi0); + + /* 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); + } + + if (bfd_consume_echo_pkt (bfd_udp_main.bfd_main, b0)) + { + b0->error = rt->errors[BFD_UDP_ERROR_NONE]; + next0 = BFD_UDP_INPUT_NEXT_NORMAL; + } + else + { + /* loop back the packet */ + b0->error = rt->errors[BFD_UDP_ERROR_NONE]; + if (is_ipv6) + { + vlib_node_increment_counter (vm, bfd_udp_echo6_input_node.index, + b0->error, 1); + } + else + { + vlib_node_increment_counter (vm, bfd_udp_echo4_input_node.index, + b0->error, 1); + } + next0 = BFD_UDP_INPUT_NEXT_REPLY_REWRITE; + } + + vlib_set_next_frame_buffer (vm, rt, next0, bi0); + + from += 1; + n_left_from -= 1; + } + + return f->n_vectors; +} + +static uword +bfd_udp_echo4_input (vlib_main_t * vm, vlib_node_runtime_t * rt, + vlib_frame_t * f) +{ + return bfd_udp_echo_input (vm, rt, f, 0); +} + +u8 * +bfd_echo_input_format_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 *); + const bfd_udp_echo_input_trace_t *t = + va_arg (*args, bfd_udp_echo_input_trace_t *); + if (t->len > STRUCT_SIZE_OF (bfd_pkt_t, head)) + { + s = format (s, "BFD ECHO:\n"); + s = format (s, " data: %U", format_hexdump, t->data, t->len); + } + + return s; +} + +/* + * bfd input graph node declaration + */ +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (bfd_udp_echo4_input_node, static) = { + .function = bfd_udp_echo4_input, + .name = "bfd-udp-echo4-input", + .vector_size = sizeof (u32), + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = BFD_UDP_ECHO_N_ERROR, + .error_strings = bfd_udp_error_strings, + + .format_trace = bfd_echo_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_ARP] = "ip4-arp", + [BFD_UDP_INPUT_NEXT_REPLY_REWRITE] = "ip4-lookup", + }, +}; +/* *INDENT-ON* */ + +static uword +bfd_udp_echo6_input (vlib_main_t * vm, vlib_node_runtime_t * rt, + vlib_frame_t * f) +{ + return bfd_udp_echo_input (vm, rt, f, 1); +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (bfd_udp_echo6_input_node, static) = { + .function = bfd_udp_echo6_input, + .name = "bfd-udp-echo6-input", + .vector_size = sizeof (u32), + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = BFD_UDP_ECHO_N_ERROR, + .error_strings = bfd_udp_echo_error_strings, + + .format_trace = bfd_echo_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_ARP] = "ip6-discover-neighbor", + [BFD_UDP_INPUT_NEXT_REPLY_REWRITE] = "ip6-lookup", + }, +}; + +/* *INDENT-ON* */ + +static clib_error_t * +bfd_udp_sw_if_add_del (vnet_main_t * vnm, u32 sw_if_index, u32 is_create) +{ + bfd_session_t **to_be_freed = NULL; + BFD_DBG ("sw_if_add_del called, sw_if_index=%u, is_create=%u", sw_if_index, + is_create); + if (!is_create) + { + bfd_session_t *bs; + pool_foreach (bs, bfd_udp_main.bfd_main->sessions, + { + if (bs->transport != BFD_TRANSPORT_UDP4 && + bs->transport != BFD_TRANSPORT_UDP6) + { + continue;} + if (bs->udp.key.sw_if_index != sw_if_index) + { + continue;} + vec_add1 (to_be_freed, bs);} + ); + } + bfd_session_t **bs; + vec_foreach (bs, to_be_freed) + { + clib_warning ("removal of sw_if_index=%u forces removal of bfd session " + "with bs_idx=%u", sw_if_index, (*bs)->bs_idx); + bfd_session_set_flags (*bs, 0); + bfd_udp_del_session_internal (*bs); + } + return 0; +} + +VNET_SW_INTERFACE_ADD_DEL_FUNCTION (bfd_udp_sw_if_add_del); + +/* + * 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; + bfd_udp_main.vnet_main = vnet_get_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); + udp_register_dst_port (vm, UDP_DST_PORT_bfd_echo4, + bfd_udp_echo4_input_node.index, 1); + udp_register_dst_port (vm, UDP_DST_PORT_bfd_echo6, + bfd_udp_echo6_input_node.index, 0); + vlib_node_t *node = vlib_get_node_by_name (vm, (u8 *) "ip4-arp"); + ASSERT (node); + bfd_udp_main.ip4_arp_idx = node->index; + node = vlib_get_node_by_name (vm, (u8 *) "ip6-discover-neighbor"); + ASSERT (node); + bfd_udp_main.ip6_ndp_idx = node->index; + node = vlib_get_node_by_name (vm, (u8 *) "ip4-rewrite"); + ASSERT (node); + bfd_udp_main.ip4_rewrite_idx = node->index; + node = vlib_get_node_by_name (vm, (u8 *) "ip6-rewrite"); + ASSERT (node); + bfd_udp_main.ip6_rewrite_idx = node->index; + + return 0; +} + +VLIB_INIT_FUNCTION (bfd_udp_init); + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |