/* * Copyright (c) 2017 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/dns/dns.h> #include <vlib/vlib.h> #include <vnet/vnet.h> vlib_node_registration_t dns46_reply_node; typedef struct { u32 pool_index; u32 disposition; } dns46_reply_trace_t; /* packet trace format function */ static u8 * format_dns46_reply_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 *); dns46_reply_trace_t *t = va_arg (*args, dns46_reply_trace_t *); s = format (s, "DNS46_REPLY: pool index %d, disposition %d", t->pool_index, t->disposition); return s; } vlib_node_registration_t dns46_reply_node; static char *dns46_reply_error_strings[] = { #define _(sym,string) string, foreach_dns46_reply_error #undef _ }; typedef enum { DNS46_REPLY_NEXT_DROP, DNS46_REPLY_NEXT_PUNT, DNS46_REPLY_N_NEXT, } dns46_reply_next_t; static uword dns46_reply_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, *from, *to_next; dns46_reply_next_t next_index; dns_main_t *dm = &dns_main; 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); #if 0 while (n_left_from >= 4 && n_left_to_next >= 2) { u32 next0 = DNS46_REPLY_NEXT_INTERFACE_OUTPUT; u32 next1 = DNS46_REPLY_NEXT_INTERFACE_OUTPUT; u32 sw_if_index0, sw_if_index1; u8 tmp0[6], tmp1[6]; ethernet_header_t *en0, *en1; u32 bi0, bi1; vlib_buffer_t *b0, *b1; /* Prefetch next iteration. */ { vlib_buffer_t *p2, *p3; p2 = vlib_get_buffer (vm, from[2]); p3 = vlib_get_buffer (vm, from[3]); vlib_prefetch_buffer_header (p2, LOAD); vlib_prefetch_buffer_header (p3, LOAD); CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE); CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE); } /* speculatively enqueue b0 and b1 to the current next frame */ to_next[0] = bi0 = from[0]; to_next[1] = bi1 = from[1]; from += 2; to_next += 2; n_left_from -= 2; n_left_to_next -= 2; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); /* $$$$$ End of processing 2 x packets $$$$$ */ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE))) { if (b0->flags & VLIB_BUFFER_IS_TRACED) { dns46_reply_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->sw_if_index = sw_if_index0; t->next_index = next0; } if (b1->flags & VLIB_BUFFER_IS_TRACED) { dns46_reply_trace_t *t = vlib_add_trace (vm, node, b1, sizeof (*t)); t->sw_if_index = sw_if_index1; t->next_index = next1; } } /* verify speculative enqueues, maybe switch current next frame */ vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1); } #endif while (n_left_from > 0 && n_left_to_next > 0) { u32 bi0; vlib_buffer_t *b0; u32 next0 = DNS46_REPLY_NEXT_DROP; dns_header_t *d0; u32 pool_index0 = ~0; u32 error0 = 0; u8 *resp0 = 0; /* 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); d0 = vlib_buffer_get_current (b0); if (PREDICT_FALSE (dm->is_enabled == 0)) { next0 = DNS46_REPLY_NEXT_PUNT; error0 = DNS46_REPLY_ERROR_DISABLED; goto done0; } pool_index0 = clib_host_to_net_u16 (d0->id); /* Save the reply */ vec_validate (resp0, vlib_buffer_length_in_chain (vm, b0) - 1); clib_memcpy (resp0, d0, vlib_buffer_length_in_chain (vm, b0)); /* * Deal with everything in process ctx on the main thread */ vlib_process_signal_event_mt (vm, dns_resolver_node.index, DNS_RESOLVER_EVENT_RESOLVED, (uword) resp0); error0 = DNS46_REPLY_ERROR_PROCESSED; done0: b0->error = node->errors[error0]; if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { dns46_reply_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->disposition = error0; t->pool_index = pool_index0; } /* 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 (dns46_reply_node) = { .function = dns46_reply_node_fn, .name = "dns46_reply", .vector_size = sizeof (u32), .format_trace = format_dns46_reply_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN (dns46_reply_error_strings), .error_strings = dns46_reply_error_strings, .n_next_nodes = DNS46_REPLY_N_NEXT, .next_nodes = { [DNS46_REPLY_NEXT_DROP] = "error-drop", [DNS46_REPLY_NEXT_PUNT] = "error-punt", }, }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */