diff options
Diffstat (limited to 'src/plugins/nat/dslite_ce_decap.c')
| -rw-r--r-- | src/plugins/nat/dslite_ce_decap.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/src/plugins/nat/dslite_ce_decap.c b/src/plugins/nat/dslite_ce_decap.c new file mode 100644 index 00000000000..615a424e871 --- /dev/null +++ b/src/plugins/nat/dslite_ce_decap.c @@ -0,0 +1,146 @@ +/* + * 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> + +vlib_node_registration_t dslite_ce_decap_node; + +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 _ +}; + +static uword +dslite_ce_decap_node_fn (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) = { + .function = dslite_ce_decap_node_fn, + .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* */ + +VLIB_NODE_FUNCTION_MULTIARCH (dslite_ce_decap_node, dslite_ce_decap_node_fn); + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |