--- /dev/null
+/*
+ * Copyright (c) 2015 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.
+ */
+/*
+ * snap_node.c: snap packet processing
+ *
+ * Copyright (c) 2010 Eliot Dresselhaus
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/pg/pg.h>
+#include <vnet/llc/llc.h>
+#include <vnet/snap/snap.h>
+
+typedef enum
+{
+ SNAP_INPUT_NEXT_DROP,
+ SNAP_INPUT_NEXT_PUNT,
+ SNAP_INPUT_NEXT_ETHERNET_TYPE,
+ SNAP_INPUT_N_NEXT,
+} snap_input_next_t;
+
+typedef struct
+{
+ u8 packet_data[32];
+} snap_input_trace_t;
+
+static u8 *
+format_snap_input_trace (u8 * s, va_list * va)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
+ snap_input_trace_t *t = va_arg (*va, snap_input_trace_t *);
+
+ s = format (s, "%U", format_snap_header, t->packet_data);
+
+ return s;
+}
+
+static uword
+snap_input (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * from_frame)
+{
+ snap_main_t *sm = &snap_main;
+ u32 n_left_from, next_index, *from, *to_next;
+
+ from = vlib_frame_vector_args (from_frame);
+ n_left_from = from_frame->n_vectors;
+
+ if (node->flags & VLIB_NODE_FLAG_TRACE)
+ vlib_trace_frame_buffers_only (vm, node,
+ from,
+ n_left_from,
+ sizeof (from[0]),
+ sizeof (snap_input_trace_t));
+
+ 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 >= 4 && n_left_to_next >= 2)
+ {
+ u32 bi0, bi1;
+ vlib_buffer_t *b0, *b1;
+ snap_header_t *h0, *h1;
+ snap_protocol_info_t *pi0, *pi1;
+ u8 next0, next1, is_ethernet0, is_ethernet1, len0, len1,
+ enqueue_code;
+ u32 oui0, oui1;
+
+ /* Prefetch next iteration. */
+ {
+ vlib_buffer_t *b2, *b3;
+
+ b2 = vlib_get_buffer (vm, from[2]);
+ b3 = vlib_get_buffer (vm, from[3]);
+
+ vlib_prefetch_buffer_header (b2, LOAD);
+ vlib_prefetch_buffer_header (b3, LOAD);
+
+ CLIB_PREFETCH (b2->data, sizeof (h0[0]), LOAD);
+ CLIB_PREFETCH (b3->data, sizeof (h1[0]), LOAD);
+ }
+
+ bi0 = from[0];
+ bi1 = from[1];
+ to_next[0] = bi0;
+ to_next[1] = bi1;
+ from += 2;
+ to_next += 2;
+ n_left_to_next -= 2;
+ n_left_from -= 2;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ b1 = vlib_get_buffer (vm, bi1);
+
+ h0 = (void *) (b0->data + b0->current_data);
+ h1 = (void *) (b1->data + b1->current_data);
+
+ oui0 = snap_header_get_oui (h0);
+ oui1 = snap_header_get_oui (h1);
+
+ is_ethernet0 = oui0 == IEEE_OUI_ethernet;
+ is_ethernet1 = oui1 == IEEE_OUI_ethernet;
+
+ len0 = sizeof (h0[0]) - (is_ethernet0 ? sizeof (h0->protocol) : 0);
+ len1 = sizeof (h1[0]) - (is_ethernet1 ? sizeof (h1->protocol) : 0);
+
+ b0->current_data += len0;
+ b1->current_data += len1;
+
+ b0->current_length -= len0;
+ b1->current_length -= len1;
+
+ pi0 = snap_get_protocol_info (sm, h0);
+ pi1 = snap_get_protocol_info (sm, h1);
+
+ next0 = pi0 ? pi0->next_index : SNAP_INPUT_NEXT_DROP;
+ next1 = pi1 ? pi1->next_index : SNAP_INPUT_NEXT_DROP;
+
+ next0 = is_ethernet0 ? SNAP_INPUT_NEXT_ETHERNET_TYPE : next0;
+ next1 = is_ethernet1 ? SNAP_INPUT_NEXT_ETHERNET_TYPE : next1;
+
+ /* In case of error. */
+ b0->error = node->errors[SNAP_ERROR_UNKNOWN_PROTOCOL];
+ b1->error = node->errors[SNAP_ERROR_UNKNOWN_PROTOCOL];
+
+ enqueue_code = (next0 != next_index) + 2 * (next1 != next_index);
+
+ if (PREDICT_FALSE (enqueue_code != 0))
+ {
+ switch (enqueue_code)
+ {
+ case 1:
+ /* A B A */
+ to_next[-2] = bi1;
+ to_next -= 1;
+ n_left_to_next += 1;
+ vlib_set_next_frame_buffer (vm, node, next0, bi0);
+ break;
+
+ case 2:
+ /* A A B */
+ to_next -= 1;
+ n_left_to_next += 1;
+ vlib_set_next_frame_buffer (vm, node, next1, bi1);
+ break;
+
+ case 3:
+ /* A B B or A B C */
+ to_next -= 2;
+ n_left_to_next += 2;
+ vlib_set_next_frame_buffer (vm, node, next0, bi0);
+ vlib_set_next_frame_buffer (vm, node, next1, bi1);
+ if (next0 == next1)
+ {
+ vlib_put_next_frame (vm, node, next_index,
+ n_left_to_next);
+ next_index = next1;
+ 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;
+ snap_header_t *h0;
+ snap_protocol_info_t *pi0;
+ u8 next0, is_ethernet0, len0;
+ u32 oui0;
+
+ 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);
+
+ h0 = (void *) (b0->data + b0->current_data);
+
+ oui0 = snap_header_get_oui (h0);
+
+ is_ethernet0 = oui0 == IEEE_OUI_ethernet;
+
+ len0 = sizeof (h0[0]) - (is_ethernet0 ? sizeof (h0->protocol) : 0);
+
+ b0->current_data += len0;
+
+ b0->current_length -= len0;
+
+ pi0 = snap_get_protocol_info (sm, h0);
+
+ next0 = pi0 ? pi0->next_index : SNAP_INPUT_NEXT_DROP;
+
+ next0 = is_ethernet0 ? SNAP_INPUT_NEXT_ETHERNET_TYPE : next0;
+
+ /* In case of error. */
+ b0->error = node->errors[SNAP_ERROR_UNKNOWN_PROTOCOL];
+
+ /* Sent packet to wrong next? */
+ if (PREDICT_FALSE (next0 != next_index))
+ {
+ /* Return old frame; remove incorrectly enqueued packet. */
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1);
+
+ /* Send to correct next. */
+ next_index = next0;
+ vlib_get_next_frame (vm, node, next_index,
+ to_next, n_left_to_next);
+
+ to_next[0] = bi0;
+ to_next += 1;
+ n_left_to_next -= 1;
+ }
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ return from_frame->n_vectors;
+}
+
+static char *snap_error_strings[] = {
+#define _(f,s) s,
+ foreach_snap_error
+#undef _
+};
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (snap_input_node) = {
+ .function = snap_input,
+ .name = "snap-input",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+
+ .n_errors = SNAP_N_ERROR,
+ .error_strings = snap_error_strings,
+
+ .n_next_nodes = SNAP_INPUT_N_NEXT,
+ .next_nodes = {
+ [SNAP_INPUT_NEXT_DROP] = "error-drop",
+ [SNAP_INPUT_NEXT_PUNT] = "error-punt",
+ [SNAP_INPUT_NEXT_ETHERNET_TYPE] = "ethernet-input-type",
+ },
+
+ .format_buffer = format_snap_header_with_length,
+ .format_trace = format_snap_input_trace,
+ .unformat_buffer = unformat_snap_header,
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+snap_input_init (vlib_main_t * vm)
+{
+ {
+ clib_error_t *error = vlib_call_init_function (vm, snap_init);
+ if (error)
+ clib_error_report (error);
+ }
+
+ snap_setup_node (vm, snap_input_node.index);
+
+ llc_register_input_protocol (vm, LLC_PROTOCOL_snap, snap_input_node.index);
+
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (snap_input_init);
+
+void
+snap_register_input_protocol (vlib_main_t * vm,
+ char *name,
+ u32 ieee_oui, u16 protocol, u32 node_index)
+{
+ snap_main_t *sm = &snap_main;
+ snap_protocol_info_t *pi;
+ snap_header_t h;
+ snap_oui_and_protocol_t key;
+
+ {
+ clib_error_t *error = vlib_call_init_function (vm, snap_input_init);
+ if (error)
+ clib_error_report (error);
+ }
+
+ h.protocol = clib_host_to_net_u16 (protocol);
+ h.oui[0] = (ieee_oui >> 16) & 0xff;
+ h.oui[1] = (ieee_oui >> 8) & 0xff;
+ h.oui[2] = (ieee_oui >> 0) & 0xff;
+ pi = snap_get_protocol_info (sm, &h);
+ if (pi)
+ return;
+
+ vec_add2 (sm->protocols, pi, 1);
+
+ pi->name = format (0, "%s", name);
+ pi->node_index = node_index;
+ pi->next_index = vlib_node_add_next (vm, snap_input_node.index, node_index);
+
+ key.oui = ieee_oui;
+ key.protocol = clib_host_to_net_u16 (protocol);
+
+ mhash_set (&sm->protocol_hash, &key, pi - sm->protocols, /* old_value */ 0);
+ hash_set_mem (sm->protocol_info_by_name, name, pi - sm->protocols);
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
Code Review / vpp.git / blobdiff