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