| #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_add_udp4_transport (vlib_main_t *vm, vlib_buffer_t *b, |
| bfd_udp_session_t *bus) |
| { |
| udp_header_t *udp; |
| const bfd_udp_key_t *key = &bus->key; |
| |
| b->flags |= VNET_BUFFER_LOCALLY_ORIGINATED; |
| vnet_buffer (b)->ip.adj_index[VLIB_RX] = bus->adj_index; |
| vnet_buffer (b)->ip.adj_index[VLIB_TX] = bus->adj_index; |
| ip4_header_t *ip4; |
| const size_t headers_size = sizeof (*ip4) + sizeof (*udp); |
| vlib_buffer_advance (b, -headers_size); |
| ip4 = vlib_buffer_get_current (b); |
| udp = (udp_header_t *)(ip4 + 1); |
| memset (ip4, 0, headers_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 */ |
| const u16 ip_length = vlib_buffer_length_in_chain (vm, b); |
| |
| ip4->length = clib_host_to_net_u16 (ip_length); |
| ip4->checksum = ip4_header_checksum (ip4); |
| |
| const u16 udp_length = ip_length - (sizeof (*ip4)); |
| udp->length = clib_host_to_net_u16 (udp_length); |
| } |
| |
| void bfd_add_udp6_transport (vlib_main_t *vm, vlib_buffer_t *b, |
| bfd_udp_session_t *bus) |
| { |
| udp_header_t *udp; |
| const bfd_udp_key_t *key = &bus->key; |
| |
| b->flags |= VNET_BUFFER_LOCALLY_ORIGINATED; |
| vnet_buffer (b)->ip.adj_index[VLIB_RX] = bus->adj_index; |
| vnet_buffer (b)->ip.adj_index[VLIB_TX] = bus->adj_index; |
| ip6_header_t *ip6; |
| const size_t headers_size = sizeof (*ip6) + sizeof (*udp); |
| vlib_buffer_advance (b, -headers_size); |
| ip6 = vlib_buffer_get_current (b); |
| udp = (udp_header_t *)(ip6 + 1); |
| memset (ip6, 0, headers_size); |
| ip6->ip_version_traffic_class_and_flow_label = |
| clib_host_to_net_u32 (0x6 << 28); |
| ip6->hop_limit = 255; |
| ip6->protocol = IP_PROTOCOL_UDP; |
| clib_memcpy (&ip6->src_address, &key->local_addr.ip6, |
| sizeof (ip6->src_address)); |
| clib_memcpy (&ip6->dst_address, &key->peer_addr.ip6, |
| sizeof (ip6->dst_address)); |
| |
| udp->src_port = clib_host_to_net_u16 (50000); /* FIXME */ |
| 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 (*ip6)); |
| udp->length = clib_host_to_net_u16 (udp_length); |
| ip6->payload_length = udp->length; |
| |
| /* IPv6 UDP checksum is mandatory */ |
| int bogus = 0; |
| udp->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus); |
| ASSERT (bogus == 0); |
| if (udp->checksum == 0) |
| { |
| udp->checksum = 0xffff; |
| } |
| } |
| |
| 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, u32 *bs_index) |
| { |
| 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->required_min_echo_rx_us = required_min_rx_us; /* FIXME */ |
| bs->local_detect_mult = detect_mult; |
| bfd_session_start (bum->bfd_main, bs); |
| *bs_index = bs->bs_idx; |
| 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, |
| u32 *bs_index) |
| { |
| 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, bs_index); |
| } |
| |
| 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 ("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 || |
| clib_net_to_host_u16 (udp->src_port) > 65535) |
| { |
| 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; |
| } |
| 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 void bfd_udp6_find_headers (vlib_buffer_t *b, const ip6_header_t **ip6, |
| 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"); |
| *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; |
| } |
| *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 || |
| clib_net_to_host_u16 (udp->src_port) > 65535) |
| { |
| 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; |
| } |
| const ip6_header_t *ip6; |
| const 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; |
| } |
| 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_session (pkt, b->current_length, bs)) |
| { |
| 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)) |
| { |
| 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); |