/* * Copyright (c) 2017-2020 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. */ #include <vnet/ip/ip6_packet.h> #include "hicn.h" #include "mapme.h" #include "mapme_ack.h" #include "mapme_eventmgr.h" #include "mgmt.h" #include "parser.h" #include "data_fwd.h" #include "infra.h" #include "strategy_dpo_manager.h" #include "error.h" #include "state.h" extern hicn_mapme_main_t mapme_main; /* packet trace format function */ static u8 *hicn_mapme_ack_format_trace (u8 * s, va_list * args); /* Stats string values */ static char *hicn_mapme_ack_error_strings[] = { #define _(sym, string) string, foreach_hicnfwd_error #undef _ }; /* * @brief Process incoming ack messages (Interest Update Ack) * @param vm vlib main data structure * @param b Control packet (IU) * @param face_id Ingress face id */ bool hicn_mapme_process_ack (vlib_main_t * vm, vlib_buffer_t * b, hicn_face_id_t in_face) { seq_t fib_seq; const dpo_id_t *dpo; hicn_prefix_t prefix; mapme_params_t params; int rc; /* Parse incoming message */ rc = hicn_mapme_parse_packet (vlib_buffer_get_current (b), &prefix, ¶ms); if (rc < 0) goto ERR_PARSE; /* if (params.seq == INVALID_SEQ) */ /* { */ /* DEBUG ("Invalid sequence number found in IU"); */ /* return true; */ /* } */ dpo = fib_epm_lookup (&(prefix.name), prefix.len); if (!dpo) { DEBUG ("Ignored ACK for non-existing FIB entry. Ignored."); return true; } /* We are only expecting ACKs for hICN DPOs */ ASSERT (dpo_is_hicn (dpo)); hicn_mapme_tfib_t *tfib = TFIB (hicn_strategy_dpo_ctx_get (dpo->dpoi_index)); if (tfib == NULL) { WARN ("Unable to get strategy ctx."); return false; } fib_seq = tfib->seq; /* * As we always retransmit IU with the latest seq, we are not interested in * ACKs with inferior seq */ if (params.seq < fib_seq) { DEBUG ("Ignored ACK for low seq"); return true; } hicn_mapme_tfib_del (tfib, in_face); /* * Is the ingress face in TFIB ? if so, remove it, otherwise it might be a * duplicate */ retx_t *retx = vlib_process_signal_event_data (vm, hicn_mapme_eventmgr_process_node. index, HICN_MAPME_EVENT_FACE_PH_DEL, 1, sizeof (retx_t)); *retx = (retx_t) { .prefix = prefix, .dpo = *dpo }; return true; ERR_PARSE: return false; } vlib_node_registration_t hicn_mapme_ack_node; static uword hicn_mapme_ack_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { hicn_buffer_t *hb; hicn_mapme_ack_next_t next_index; u32 n_left_from, *from, *to_next; n_left_from = frame->n_vectors; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; next_index = node->cached_next_index; while (n_left_from > 0) // buffers in the current frame { u32 n_left_to_next; vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from > 0 && n_left_to_next > 0) { u32 bi0; vlib_buffer_t *b0; u32 next0 = HICN_MAPME_ACK_NEXT_ERROR_DROP; u32 sw_if_index0; /* speculatively enqueue b0 to the current next frame */ bi0 = from[0]; to_next[0] = bi0; from += 1; to_next += 1; n_left_from -= 1; n_left_to_next -= 1; b0 = vlib_get_buffer (vm, bi0); vlib_cli_output (vm, "Received IUAck"); hb = hicn_get_buffer (b0); hicn_mapme_process_ack (vm, b0, hb->face_id); /* Single loop: process 1 packet here */ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { hicn_mapme_ack_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->sw_if_index = sw_if_index0; t->next_index = next0; } /* $$$$$ Done processing 1 packet here $$$$$ */ /* verify speculative enqueue, maybe switch current next frame */ vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } // vlib_node_increment_counter (vm, hicn_mapme_ack_node.index, // HICN_MAPME_ACK_ERROR_SWAPPED, pkts_swapped); return (frame->n_vectors); } /* packet trace format function */ static u8 * hicn_mapme_ack_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 *); hicn_mapme_ack_trace_t *t = va_arg (*args, hicn_mapme_ack_trace_t *); s = format (s, "MAPME_ACK: pkt: %d, sw_if_index %d, next index %d", (int) t->pkt_type, t->sw_if_index, t->next_index); return (s); } /* * Node registration for the MAP-Me node processing special interests */ /* *INDENT-OFF* */ VLIB_REGISTER_NODE (hicn_mapme_ack_node) = { .function = hicn_mapme_ack_node_fn, .name = "hicn-mapme-ack", .vector_size = sizeof (u32), .runtime_data_bytes = sizeof (hicn_mapme_ack_runtime_t), .format_trace = hicn_mapme_ack_format_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN (hicn_mapme_ack_error_strings), .error_strings = hicn_mapme_ack_error_strings, .n_next_nodes = HICN_MAPME_ACK_N_NEXT, .next_nodes = { [HICN_MAPME_ACK_NEXT_ERROR_DROP] = "error-drop", }, }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */