| /* |
| * 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_local.h> |
| #include <vnet/udp/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/ip6_packet.h> |
| #include <vnet/ip/ip6_link.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; |
| /* node index of "ip4-midchain" node */ |
| u32 ip4_midchain_idx; |
| /* node index of "ip6-midchain" node */ |
| u32 ip6_midchain_idx; |
| /* log class */ |
| vlib_log_class_t log_class; |
| /* number of active udp4 sessions */ |
| u32 udp4_sessions_count; |
| /* number of active udp6 sessions */ |
| u32 udp6_sessions_count; |
| } 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_or_null (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_or_null (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); |
| clib_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); |
| clib_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_fast (&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_fast (&headers->ip6.src_address, &key->local_addr.ip6, |
| sizeof (headers->ip6.src_address)); |
| clib_memcpy_fast (&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) |
| { |
| vnet_main_t *vnm = vnet_get_main (); |
| const bfd_udp_session_t *bus = &bs->udp; |
| ip_adjacency_t *adj = adj_get (bus->adj_index); |
| |
| /* don't try to send the buffer if the interface is not up */ |
| if (!vnet_sw_interface_is_up (vnm, bus->key.sw_if_index)) |
| return 0; |
| |
| 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; |
| case IP_LOOKUP_NEXT_MIDCHAIN: |
| switch (bs->transport) |
| { |
| case BFD_TRANSPORT_UDP4: |
| *next_node = bfd_udp_main.ip4_midchain_idx; |
| return 1; |
| case BFD_TRANSPORT_UDP6: |
| *next_node = bfd_udp_main.ip6_midchain_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) |
| { |
| clib_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 (vlib_main_t * vm, 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) |
| { |
| return VNET_API_ERROR_BFD_EAGAIN; |
| } |
| bfd_udp_session_t *bus = &bs->udp; |
| clib_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) |
| { |
| vlib_log_err (bum->log_class, |
| "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); |
| vlib_log_info (bum->log_class, "create BFD session: %U", |
| format_bfd_session, bs); |
| 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); |
| ++bum->udp4_sessions_count; |
| if (1 == bum->udp4_sessions_count) |
| { |
| udp_register_dst_port (vm, UDP_DST_PORT_bfd4, |
| bfd_udp4_input_node.index, 1); |
| udp_register_dst_port (vm, UDP_DST_PORT_bfd_echo4, |
| bfd_udp_echo4_input_node.index, 1); |
| } |
| } |
| 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); |
| ++bum->udp6_sessions_count; |
| if (1 == bum->udp6_sessions_count) |
| { |
| udp_register_dst_port (vm, UDP_DST_PORT_bfd6, |
| bfd_udp6_input_node.index, 0); |
| udp_register_dst_port (vm, UDP_DST_PORT_bfd_echo6, |
| bfd_udp_echo6_input_node.index, 0); |
| } |
| } |
| *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) |
| { |
| bfd_udp_main_t *bum = &bfd_udp_main; |
| vnet_sw_interface_t *sw_if = |
| vnet_get_sw_interface_or_null (bfd_udp_main.vnet_main, sw_if_index); |
| u8 local_ip_valid = 0; |
| ip_interface_address_t *ia = NULL; |
| if (!sw_if) |
| { |
| vlib_log_err (bum->log_class, |
| "got NULL sw_if when getting interface by index %u", |
| sw_if_index); |
| return VNET_API_ERROR_INVALID_SW_IF_INDEX; |
| } |
| if (ip46_address_is_ip4 (local_addr)) |
| { |
| if (!ip46_address_is_ip4 (peer_addr)) |
| { |
| vlib_log_err (bum->log_class, |
| "IP family mismatch (local is ipv4, peer is ipv6)"); |
| 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)) |
| { |
| vlib_log_err (bum->log_class, |
| "IP family mismatch (local is ipv6, peer is ipv4)"); |
| return VNET_API_ERROR_INVALID_ARGUMENT; |
| } |
| |
| if (ip6_address_is_link_local_unicast (&local_addr->ip6)) |
| { |
| const ip6_address_t *ll_addr; |
| ll_addr = ip6_get_link_local_address (sw_if_index); |
| if (ll_addr && ip6_address_is_equal (ll_addr, &local_addr->ip6)) |
| { |
| /* valid address for this interface */ |
| local_ip_valid = 1; |
| } |
| } |
| else |
| { |
| 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) |
| { |
| vlib_log_err (bum->log_class, |
| "local address %U not found on interface with index %u", |
| format_ip46_address, local_addr, IP46_TYPE_ANY, |
| sw_if_index); |
| 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 |
| { |
| vlib_log_err (bum->log_class, |
| "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) |
| { |
| bfd_udp_main_t *bum = &bfd_udp_main; |
| 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) |
| { |
| vlib_log_err (bum->log_class, "detect_mult < 1"); |
| return VNET_API_ERROR_INVALID_ARGUMENT; |
| } |
| if (desired_min_tx_usec < 1) |
| { |
| vlib_log_err (bum->log_class, "desired_min_tx_usec < 1"); |
| return VNET_API_ERROR_INVALID_ARGUMENT; |
| } |
| return 0; |
| } |
| |
| static void |
| bfd_udp_del_session_internal (vlib_main_t * vm, 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); |
| switch (bs->transport) |
| { |
| case BFD_TRANSPORT_UDP4: |
| --bum->udp4_sessions_count; |
| if (!bum->udp4_sessions_count) |
| { |
| udp_unregister_dst_port (vm, UDP_DST_PORT_bfd4, 1); |
| udp_unregister_dst_port (vm, UDP_DST_PORT_bfd_echo4, 1); |
| } |
| break; |
| case BFD_TRANSPORT_UDP6: |
| --bum->udp6_sessions_count; |
| if (!bum->udp6_sessions_count) |
| { |
| udp_unregister_dst_port (vm, UDP_DST_PORT_bfd6, 0); |
| udp_unregister_dst_port (vm, UDP_DST_PORT_bfd_echo6, 0); |
| } |
| break; |
| } |
| 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) |
| { |
| bfd_main_t *bm = &bfd_main; |
| bfd_lock (bm); |
| |
| 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 (vlib_get_main (), &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) |
| { |
| rv = bfd_auth_activate (bs, conf_key_id, bfd_key_id, |
| 0 /* is not delayed */ ); |
| if (rv) |
| { |
| bfd_udp_del_session_internal (vlib_get_main (), bs); |
| } |
| } |
| if (!rv) |
| { |
| bfd_session_start (bfd_udp_main.bfd_main, bs); |
| } |
| |
| bfd_unlock (bm); |
| 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; |
| bfd_main_t *bm = &bfd_main; |
| vnet_api_error_t error; |
| bfd_lock (bm); |
| vnet_api_error_t rv = |
| bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr, |
| &bs); |
| if (rv) |
| { |
| bfd_unlock (bm); |
| return rv; |
| } |
| |
| error = bfd_session_set_params (bfd_udp_main.bfd_main, bs, |
| desired_min_tx_usec, required_min_rx_usec, |
| detect_mult); |
| bfd_unlock (bm); |
| return error; |
| } |
| |
| 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; |
| bfd_main_t *bm = &bfd_main; |
| bfd_lock (bm); |
| vnet_api_error_t rv = |
| bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr, |
| &bs); |
| if (rv) |
| { |
| bfd_unlock (bm); |
| return rv; |
| } |
| bfd_udp_del_session_internal (vlib_get_main (), bs); |
| bfd_unlock (bm); |
| return 0; |
| } |
| |
| vnet_api_error_t |
| bfd_udp_session_set_flags (vlib_main_t * vm, 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; |
| bfd_main_t *bm = &bfd_main; |
| bfd_lock (bm); |
| vnet_api_error_t rv = |
| bfd_udp_find_session_by_api_input (sw_if_index, local_addr, peer_addr, |
| &bs); |
| if (rv) |
| { |
| bfd_unlock (bm); |
| return rv; |
| } |
| bfd_session_set_flags (vm, bs, admin_up_down); |
| bfd_unlock (bm); |
| 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) |
| { |
| bfd_main_t *bm = &bfd_main; |
| bfd_lock (bm); |
| vnet_api_error_t error; |
| |
| 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) |
| { |
| bfd_unlock (bm); |
| return rv; |
| } |
| error = bfd_auth_activate (bs, conf_key_id, key_id, is_delayed); |
| bfd_unlock (bm); |
| return error; |
| } |
| |
| 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_main_t *bm = &bfd_main; |
| vnet_api_error_t error; |
| bfd_lock (bm); |
| 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) |
| { |
| bfd_unlock (bm); |
| return rv; |
| } |
| error = bfd_auth_deactivate (bs, is_delayed); |
| bfd_unlock (bm); |
| return error; |
| } |
| |
| typedef enum |
| { |
| BFD_UDP_INPUT_NEXT_NORMAL, |
| BFD_UDP_INPUT_NEXT_REPLY_ARP, |
| BFD_UDP_INPUT_NEXT_REPLY_REWRITE, |
| BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN, |
| 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; |
| |
| typedef enum |
| { |
| BFD_UDP_ECHO_INPUT_NEXT_NORMAL, |
| BFD_UDP_ECHO_INPUT_NEXT_REPLY_ARP, |
| BFD_UDP_ECHO_INPUT_NEXT_REPLY_REWRITE, |
| BFD_UDP_ECHO_INPUT_N_NEXT, |
| } bfd_udp_echo_input_next_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 (vlib_main_t * vm, u32 bs_idx, const bfd_pkt_t * pkt) |
| { |
| bfd_main_t *bm = &bfd_main; |
| bfd_lock (bm); |
| bfd_consume_pkt (vm, bm, pkt, bs_idx); |
| bfd_unlock (bm); |
| } |
| |
| 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; |
| clib_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 (vm, 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 (vm, 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; |
| clib_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 (vm, 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 (vm, 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; |
| bfd_main_t *bm = &bfd_main; |
| |
| 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_fast (t0->data, vlib_buffer_get_current (b0), len); |
| } |
| |
| /* scan this bfd pkt. error0 is the counter index to bmp */ |
| bfd_lock (bm); |
| 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; |
| 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; |
| case IP_LOOKUP_NEXT_MIDCHAIN: |
| next0 = BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN; |
| break; |
| default: |
| /* drop */ |
| break; |
| } |
| } |
| } |
| bfd_unlock (bm); |
| 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", |
| [BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN] = "ip4-midchain", |
| }, |
| }; |
| /* *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", |
| [BFD_UDP_INPUT_NEXT_REPLY_MIDCHAIN] = "ip6-midchain", |
| }, |
| }; |
| /* *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; |
| bfd_main_t *bm = &bfd_main; |
| |
| 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_fast (t0->data, vlib_buffer_get_current (b0), len); |
| } |
| |
| bfd_lock (bm); |
| if (bfd_consume_echo_pkt (vm, bfd_udp_main.bfd_main, b0)) |
| { |
| b0->error = rt->errors[BFD_UDP_ERROR_NONE]; |
| next0 = BFD_UDP_ECHO_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_ECHO_INPUT_NEXT_REPLY_REWRITE; |
| } |
| |
| bfd_unlock (bm); |
| 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_ECHO_INPUT_N_NEXT, |
| .next_nodes = |
| { |
| [BFD_UDP_ECHO_INPUT_NEXT_NORMAL] = "error-drop", |
| [BFD_UDP_ECHO_INPUT_NEXT_REPLY_ARP] = "ip4-arp", |
| [BFD_UDP_ECHO_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_ECHO_INPUT_N_NEXT, |
| .next_nodes = |
| { |
| [BFD_UDP_ECHO_INPUT_NEXT_NORMAL] = "error-drop", |
| [BFD_UDP_ECHO_INPUT_NEXT_REPLY_ARP] = "ip6-discover-neighbor", |
| [BFD_UDP_ECHO_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_udp_main_t *bum = &bfd_udp_main; |
| 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) |
| { |
| vlib_log_notice (bum->log_class, |
| "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 (vlib_get_main (), *bs, 0); |
| bfd_udp_del_session_internal (vlib_get_main (), *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) |
| { |
| bfd_udp_main.udp4_sessions_count = 0; |
| bfd_udp_main.udp6_sessions_count = 0; |
| 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 (); |
| 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; |
| node = vlib_get_node_by_name (vm, (u8 *) "ip4-midchain"); |
| ASSERT (node); |
| bfd_udp_main.ip4_midchain_idx = node->index; |
| node = vlib_get_node_by_name (vm, (u8 *) "ip6-midchain"); |
| ASSERT (node); |
| bfd_udp_main.ip6_midchain_idx = node->index; |
| |
| bfd_udp_main.log_class = vlib_log_register_class ("bfd", "udp"); |
| vlib_log_debug (bfd_udp_main.log_class, "initialized"); |
| return 0; |
| } |
| |
| VLIB_INIT_FUNCTION (bfd_udp_init); |
| |
| /* |
| * fd.io coding-style-patch-verification: ON |
| * |
| * Local Variables: |
| * eval: (c-set-style "gnu") |
| * End: |
| */ |