/* * Copyright (c) 2018 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 <nat/dslite.h> #include <nat/nat_inlines.h> typedef enum { DSLITE_CE_DECAP_NEXT_IP4_LOOKUP, DSLITE_IN2OUT_NEXT_IP6_ICMP, DSLITE_CE_DECAP_NEXT_DROP, DSLITE_CE_DECAP_N_NEXT, } dslite_ce_decap_next_t; static char *dslite_ce_decap_error_strings[] = { #define _(sym,string) string, foreach_dslite_error #undef _ }; VLIB_NODE_FN (dslite_ce_decap_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, *from, *to_next; dslite_ce_decap_next_t next_index; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; next_index = node->cached_next_index; while (n_left_from > 0) { 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 = DSLITE_CE_DECAP_NEXT_IP4_LOOKUP; u8 error0 = DSLITE_ERROR_CE_DECAP; ip4_header_t *ip40; ip6_header_t *ip60; u32 proto0; /* 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); ip60 = vlib_buffer_get_current (b0); if (PREDICT_FALSE (ip60->protocol != IP_PROTOCOL_IP_IN_IP)) { if (ip60->protocol == IP_PROTOCOL_ICMP6) { next0 = DSLITE_IN2OUT_NEXT_IP6_ICMP; goto trace0; } error0 = DSLITE_ERROR_BAD_IP6_PROTOCOL; next0 = DSLITE_CE_DECAP_NEXT_DROP; goto trace0; } ip40 = vlib_buffer_get_current (b0) + sizeof (ip6_header_t); proto0 = ip_proto_to_snat_proto (ip40->protocol); if (PREDICT_FALSE (proto0 == ~0)) { error0 = DSLITE_ERROR_UNSUPPORTED_PROTOCOL; next0 = DSLITE_CE_DECAP_NEXT_DROP; goto trace0; } ip40->tos = (clib_net_to_host_u32 (ip60->ip_version_traffic_class_and_flow_label) & 0x0ff00000) >> 20; vlib_buffer_advance (b0, sizeof (ip6_header_t)); trace0: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { dslite_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->next_index = next0; } b0->error = node->errors[error0]; /* 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); } return frame->n_vectors; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (dslite_ce_decap_node) = { .name = "dslite-ce-decap", .vector_size = sizeof (u32), .format_trace = format_dslite_ce_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN (dslite_ce_decap_error_strings), .error_strings = dslite_ce_decap_error_strings, .n_next_nodes = DSLITE_CE_DECAP_N_NEXT, /* edit / add dispositions here */ .next_nodes = { [DSLITE_CE_DECAP_NEXT_DROP] = "error-drop", [DSLITE_CE_DECAP_NEXT_IP4_LOOKUP] = "ip4-lookup", [DSLITE_IN2OUT_NEXT_IP6_ICMP] = "ip6-icmp-input", }, }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */