--- /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.
+ */
+/*
+ * ip/ip6_input.c: IP v6 input node
+ *
+ * Copyright (c) 2008 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 <vnet/ip/ip.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/ppp/ppp.h>
+#include <vnet/hdlc/hdlc.h>
+
+typedef struct {
+ u8 packet_data[64];
+} ip6_input_trace_t;
+
+static u8 * format_ip6_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 *);
+ ip6_input_trace_t * t = va_arg (*va, ip6_input_trace_t *);
+
+ s = format (s, "%U",
+ format_ip6_header,
+ t->packet_data, sizeof (t->packet_data));
+
+ return s;
+}
+
+typedef enum {
+ IP6_INPUT_NEXT_DROP,
+ IP6_INPUT_NEXT_LOOKUP,
+ IP6_INPUT_NEXT_TTL_EXPIRE,
+ IP6_INPUT_N_NEXT,
+} ip6_input_next_t;
+
+/* Validate IP v6 packets and pass them either to forwarding code
+ or drop exception packets. */
+static uword
+ip6_input (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ vnet_main_t * vnm = vnet_get_main();
+ ip6_main_t * im = &ip6_main;
+ ip_lookup_main_t * lm = &im->lookup_main;
+ u32 n_left_from, * from, * to_next;
+ ip6_input_next_t next_index;
+ vlib_node_runtime_t * error_node = vlib_node_get_runtime (vm, ip6_input_node.index);
+ vlib_simple_counter_main_t * cm;
+ u32 cpu_index = os_get_cpu_number();
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+
+ if (node->flags & VLIB_NODE_FLAG_TRACE)
+ vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
+ /* stride */ 1,
+ sizeof (ip6_input_trace_t));
+
+ cm = vec_elt_at_index (vnm->interface_main.sw_if_counters,
+ VNET_INTERFACE_COUNTER_IP6);
+
+ 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)
+ {
+ vlib_buffer_t * p0, * p1;
+ ip6_header_t * ip0, * ip1;
+ ip_config_main_t * cm0, * cm1;
+ u32 pi0, sw_if_index0, next0;
+ u32 pi1, sw_if_index1, next1;
+ u8 error0, error1, cast0, cast1;
+
+ /* 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, sizeof (ip0[0]), LOAD);
+ CLIB_PREFETCH (p3->data, sizeof (ip1[0]), LOAD);
+ }
+
+ pi0 = from[0];
+ pi1 = from[1];
+
+ to_next[0] = pi0;
+ to_next[1] = pi1;
+ from += 2;
+ to_next += 2;
+ n_left_from -= 2;
+ n_left_to_next -= 2;
+
+ p0 = vlib_get_buffer (vm, pi0);
+ p1 = vlib_get_buffer (vm, pi1);
+
+ ip0 = vlib_buffer_get_current (p0);
+ ip1 = vlib_buffer_get_current (p1);
+
+ sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
+ sw_if_index1 = vnet_buffer (p1)->sw_if_index[VLIB_RX];
+
+ cast0 = ip6_address_is_multicast (&ip0->dst_address) ? VNET_MULTICAST : VNET_UNICAST;
+ cast1 = ip6_address_is_multicast (&ip1->dst_address) ? VNET_MULTICAST : VNET_UNICAST;
+
+ cm0 = lm->rx_config_mains + cast0;
+ cm1 = lm->rx_config_mains + cast1;
+
+ vnet_buffer (p0)->ip.current_config_index = vec_elt (cm0->config_index_by_sw_if_index, sw_if_index0);
+ vnet_buffer (p1)->ip.current_config_index = vec_elt (cm1->config_index_by_sw_if_index, sw_if_index1);
+
+ vnet_buffer (p0)->ip.adj_index[VLIB_RX] = ~0;
+ vnet_buffer (p1)->ip.adj_index[VLIB_RX] = ~0;
+
+ vnet_get_config_data (&cm0->config_main,
+ &vnet_buffer (p0)->ip.current_config_index,
+ &next0,
+ /* # bytes of config data */ 0);
+ vnet_get_config_data (&cm1->config_main,
+ &vnet_buffer (p1)->ip.current_config_index,
+ &next1,
+ /* # bytes of config data */ 0);
+
+ vlib_increment_simple_counter (cm, cpu_index, sw_if_index0, 1);
+ vlib_increment_simple_counter (cm, cpu_index, sw_if_index1, 1);
+
+ error0 = error1 = IP6_ERROR_NONE;
+
+ /* Version != 6? Drop it. */
+ error0 = (clib_net_to_host_u32 (ip0->ip_version_traffic_class_and_flow_label) >> 28) != 6 ? IP6_ERROR_VERSION : error0;
+ error1 = (clib_net_to_host_u32 (ip1->ip_version_traffic_class_and_flow_label) >> 28) != 6 ? IP6_ERROR_VERSION : error1;
+
+ /* hop limit < 1? Drop it. for link-local broadcast packets,
+ * like dhcpv6 packets from client has hop-limit 1, which should not
+ * be dropped.
+ */
+ error0 = ip0->hop_limit <= 1 ? IP6_ERROR_TIME_EXPIRED : error0;
+ error1 = ip1->hop_limit <= 1 ? IP6_ERROR_TIME_EXPIRED : error1;
+
+ /* L2 length must be at least minimal IP header. */
+ error0 = p0->current_length < sizeof (ip0[0]) ? IP6_ERROR_TOO_SHORT : error0;
+ error1 = p1->current_length < sizeof (ip1[0]) ? IP6_ERROR_TOO_SHORT : error1;
+
+ if (PREDICT_FALSE(error0 != IP6_ERROR_NONE))
+ {
+ next0 = (error0 == IP6_ERROR_TIME_EXPIRED) ?
+ IP6_INPUT_NEXT_TTL_EXPIRE : IP6_INPUT_NEXT_DROP;
+ }
+ if (PREDICT_FALSE(error1 != IP6_ERROR_NONE))
+ {
+ next1 = (error1 == IP6_ERROR_TIME_EXPIRED) ?
+ IP6_INPUT_NEXT_TTL_EXPIRE : IP6_INPUT_NEXT_DROP;
+ }
+
+ p0->error = error_node->errors[error0];
+ p1->error = error_node->errors[error1];
+
+ vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
+ to_next, n_left_to_next,
+ pi0, pi1, next0, next1);
+ }
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ vlib_buffer_t * p0;
+ ip6_header_t * ip0;
+ ip_config_main_t * cm0;
+ u32 pi0, sw_if_index0, next0;
+ u8 error0, cast0;
+
+ pi0 = from[0];
+ to_next[0] = pi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ p0 = vlib_get_buffer (vm, pi0);
+ ip0 = vlib_buffer_get_current (p0);
+
+ sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
+ cast0 = ip6_address_is_multicast (&ip0->dst_address) ? VNET_MULTICAST : VNET_UNICAST;
+ cm0 = lm->rx_config_mains + cast0;
+ vnet_buffer (p0)->ip.current_config_index = vec_elt (cm0->config_index_by_sw_if_index, sw_if_index0);
+ vnet_buffer (p0)->ip.adj_index[VLIB_RX] = ~0;
+
+ vnet_get_config_data (&cm0->config_main,
+ &vnet_buffer (p0)->ip.current_config_index,
+ &next0,
+ /* # bytes of config data */ 0);
+
+ vlib_increment_simple_counter (cm, cpu_index, sw_if_index0, 1);
+ error0 = IP6_ERROR_NONE;
+
+ /* Version != 6? Drop it. */
+ error0 = (clib_net_to_host_u32 (ip0->ip_version_traffic_class_and_flow_label) >> 28) != 6 ? IP6_ERROR_VERSION : error0;
+
+ /* hop limit < 1? Drop it. for link-local broadcast packets,
+ * like dhcpv6 packets from client has hop-limit 1, which should not
+ * be dropped.
+ */
+ error0 = ip0->hop_limit <= 1 ? IP6_ERROR_TIME_EXPIRED : error0;
+
+ /* L2 length must be at least minimal IP header. */
+ error0 = p0->current_length < sizeof (ip0[0]) ? IP6_ERROR_TOO_SHORT : error0;
+
+ if (PREDICT_FALSE(error0 != IP6_ERROR_NONE))
+ {
+ next0 = (error0 == IP6_ERROR_TIME_EXPIRED) ?
+ IP6_INPUT_NEXT_TTL_EXPIRE : IP6_INPUT_NEXT_DROP;
+ }
+ p0->error = error_node->errors[error0];
+
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ pi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ return frame->n_vectors;
+}
+
+static char * ip6_error_strings[] = {
+#define _(sym,string) string,
+ foreach_ip6_error
+#undef _
+};
+
+VLIB_REGISTER_NODE (ip6_input_node) = {
+ .function = ip6_input,
+ .name = "ip6-input",
+ .vector_size = sizeof (u32),
+
+ .n_errors = IP6_N_ERROR,
+ .error_strings = ip6_error_strings,
+
+ .n_next_nodes = IP6_INPUT_N_NEXT,
+ .next_nodes = {
+ [IP6_INPUT_NEXT_DROP] = "error-drop",
+ [IP6_INPUT_NEXT_LOOKUP] = "ip6-lookup",
+ [IP6_INPUT_NEXT_TTL_EXPIRE] = "ip6-icmp-ttl-expire",
+ },
+
+ .format_buffer = format_ip6_header,
+ .format_trace = format_ip6_input_trace,
+};
+
+static clib_error_t * ip6_init (vlib_main_t * vm)
+{
+ ethernet_register_input_type (vm, ETHERNET_TYPE_IP6,
+ ip6_input_node.index);
+ ppp_register_input_protocol (vm, PPP_PROTOCOL_ip6,
+ ip6_input_node.index);
+ hdlc_register_input_protocol (vm, HDLC_PROTOCOL_ip6,
+ ip6_input_node.index);
+
+ {
+ pg_node_t * pn;
+ pn = pg_get_node (ip6_input_node.index);
+ pn->unformat_edit = unformat_pg_ip6_header;
+ }
+
+ /* Set flow hash to something non-zero. */
+ ip6_main.flow_hash_seed = 0xdeadbeef;
+
+ /* Default hop limit for packets we generate. */
+ ip6_main.host_config.ttl = 64;
+
+ return /* no error */ 0;
+}
+
+VLIB_INIT_FUNCTION (ip6_init);
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