--- /dev/null
+/*
+ * 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_request_node;
+
+typedef struct
+{
+ u32 pool_index;
+ u32 disposition;
+} dns46_request_trace_t;
+
+/* packet trace format function */
+static u8 *
+format_dns46_request_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_request_trace_t *t = va_arg (*args, dns46_request_trace_t *);
+
+ s = format (s, "DNS46_REPLY: pool index %d, disposition %d",
+ t->pool_index, t->disposition);
+ return s;
+}
+
+vlib_node_registration_t dns46_request_node;
+
+static char *dns46_request_error_strings[] = {
+#define _(sym,string) string,
+ foreach_dns46_request_error
+#undef _
+};
+
+typedef enum
+{
+ DNS46_REQUEST_NEXT_DROP,
+ DNS46_REQUEST_NEXT_IP_LOOKUP,
+ DNS46_REQUEST_N_NEXT,
+} dns46_request_next_t;
+
+static uword
+dns46_request_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame,
+ int is_ip6)
+{
+ u32 n_left_from, *from, *to_next;
+ dns46_request_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_REQUEST_NEXT_INTERFACE_OUTPUT;
+ u32 next1 = DNS46_REQUEST_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_request_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_request_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_REQUEST_NEXT_DROP;
+ u32 error0 = DNS46_REQUEST_ERROR_NONE;
+ udp_header_t *u0;
+ dns_header_t *d0;
+ dns_query_t *q0;
+ ip4_header_t *ip40 = 0;
+ ip6_header_t *ip60 = 0;
+ dns_cache_entry_t *ep0;
+ dns_pending_request_t _t0, *t0 = &_t0;
+ u16 flags0;
+ u32 pool_index0 = ~0;
+ u8 *name0;
+ u8 *label0;
+
+ /* 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);
+ u0 = (udp_header_t *) ((u8 *) d0 - sizeof (*u0));
+ if (is_ip6)
+ {
+ ip60 = (ip6_header_t *) (((u8 *) u0) - sizeof (ip4_header_t));
+ error0 = DNS46_REQUEST_ERROR_UNIMPLEMENTED;
+ goto done0;
+ }
+ else
+ {
+ ip40 = (ip4_header_t *) (((u8 *) u0) - sizeof (ip4_header_t));
+ if (ip40->ip_version_and_header_length != 0x45)
+ {
+ error0 = DNS46_REQUEST_ERROR_IP_OPTIONS;
+ goto done0;
+ }
+ }
+ /* Parse through the DNS request */
+ flags0 = clib_net_to_host_u16 (d0->flags);
+
+ /* Requests only */
+ if (flags0 & DNS_QR)
+ {
+ error0 = DNS46_REQUEST_ERROR_BAD_REQUEST;
+ goto done0;
+ }
+ if (clib_net_to_host_u16 (d0->qdcount) != 1)
+ {
+ error0 = DNS46_REQUEST_ERROR_TOO_MANY_REQUESTS;
+ goto done0;
+ }
+
+ label0 = (u8 *) (d0 + 1);
+
+ name0 = vnet_dns_labels_to_name (label0, (u8 *) d0, (u8 **) & q0);
+
+ t0->request_type = DNS_PEER_PENDING_NAME_TO_IP;
+
+ /*
+ * See if this is a reverse lookup. Both ip4 and ip6 reverse
+ * requests end with ".arpa"
+ */
+ if (PREDICT_TRUE (vec_len (name0) > 5))
+ {
+ u8 *aptr0 = name0 + vec_len (name0) - 5;
+
+ if (!memcmp (aptr0, ".arpa", 5))
+ t0->request_type = DNS_PEER_PENDING_IP_TO_NAME;
+ }
+
+ t0->client_index = ~0;
+ t0->is_ip6 = is_ip6;
+ t0->dst_port = u0->src_port;
+ t0->id = d0->id;
+ t0->name = name0;
+ if (is_ip6)
+ clib_memcpy (t0->dst_address, ip60->src_address.as_u8,
+ sizeof (ip6_address_t));
+ else
+ clib_memcpy (t0->dst_address, ip40->src_address.as_u8,
+ sizeof (ip4_address_t));
+
+ vnet_dns_resolve_name (dm, name0, t0, &ep0);
+
+ if (ep0)
+ {
+ if (is_ip6)
+ vnet_send_dns6_reply (dm, t0, ep0, b0);
+ else
+ vnet_send_dns4_reply (dm, t0, ep0, b0);
+ next0 = DNS46_REQUEST_NEXT_IP_LOOKUP;
+ }
+ else
+ {
+ error0 = DNS46_REQUEST_ERROR_RESOLUTION_REQUIRED;
+ }
+
+ done0:
+ b0->error = node->errors[error0];
+
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ dns46_request_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;
+}
+
+static uword
+dns4_request_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+
+ return dns46_request_inline (vm, node, frame, 0 /* is_ip6 */ );
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (dns4_request_node) =
+{
+ .function = dns4_request_node_fn,
+ .name = "dns4-request",
+ .vector_size = sizeof (u32),
+ .format_trace = format_dns46_request_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN (dns46_request_error_strings),
+ .error_strings = dns46_request_error_strings,
+ .n_next_nodes = DNS46_REQUEST_N_NEXT,
+ .next_nodes = {
+ [DNS46_REQUEST_NEXT_DROP] = "error-drop",
+ [DNS46_REQUEST_NEXT_IP_LOOKUP] = "ip4-lookup",
+ },
+};
+/* *INDENT-ON* */
+
+static uword
+dns6_request_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+
+ return dns46_request_inline (vm, node, frame, 1 /* is_ip6 */ );
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (dns6_request_node) =
+{
+ .function = dns6_request_node_fn,
+ .name = "dns6-request",
+ .vector_size = sizeof (u32),
+ .format_trace = format_dns46_request_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN (dns46_request_error_strings),
+ .error_strings = dns46_request_error_strings,
+ .n_next_nodes = DNS46_REQUEST_N_NEXT,
+ .next_nodes = {
+ [DNS46_REQUEST_NEXT_DROP] = "error-drop",
+ [DNS46_REQUEST_NEXT_IP_LOOKUP] = "ip6-lookup",
+ },
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
Code Review / vpp.git / blobdiff