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diff --git a/src/vnet/ip/ip4_input.c b/src/vnet/ip/ip4_input.c
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+/*
+ * 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/ip4_input.c: IP v4 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];
+} ip4_input_trace_t;
+
+static u8 *
+format_ip4_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 *);
+ ip4_input_trace_t *t = va_arg (*va, ip4_input_trace_t *);
+
+ s = format (s, "%U",
+ format_ip4_header, t->packet_data, sizeof (t->packet_data));
+
+ return s;
+}
+
+typedef enum
+{
+ IP4_INPUT_NEXT_DROP,
+ IP4_INPUT_NEXT_PUNT,
+ IP4_INPUT_NEXT_LOOKUP,
+ IP4_INPUT_NEXT_LOOKUP_MULTICAST,
+ IP4_INPUT_NEXT_ICMP_ERROR,
+ IP4_INPUT_N_NEXT,
+} ip4_input_next_t;
+
+/* Validate IP v4 packets and pass them either to forwarding code
+ or drop/punt exception packets. */
+always_inline uword
+ip4_input_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame, int verify_checksum)
+{
+ ip4_main_t *im = &ip4_main;
+ vnet_main_t *vnm = vnet_get_main ();
+ ip_lookup_main_t *lm = &im->lookup_main;
+ u32 n_left_from, *from, *to_next;
+ ip4_input_next_t next_index;
+ vlib_node_runtime_t *error_node =
+ vlib_node_get_runtime (vm, ip4_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 (ip4_input_trace_t));
+
+ cm = vec_elt_at_index (vnm->interface_main.sw_if_counters,
+ VNET_INTERFACE_COUNTER_IP4);
+
+ 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;
+ ip4_header_t *ip0, *ip1;
+ u32 sw_if_index0, pi0, ip_len0, cur_len0, next0;
+ u32 sw_if_index1, pi1, ip_len1, cur_len1, next1;
+ i32 len_diff0, len_diff1;
+ u8 error0, error1, arc0, arc1;
+
+ /* 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);
+ }
+
+ to_next[0] = pi0 = from[0];
+ to_next[1] = pi1 = from[1];
+ 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];
+
+ error0 = error1 = IP4_ERROR_NONE;
+
+ if (PREDICT_FALSE (ip4_address_is_multicast (&ip0->dst_address)))
+ {
+ arc0 = lm->mcast_feature_arc_index;
+ next0 = IP4_INPUT_NEXT_LOOKUP_MULTICAST;
+ }
+ else
+ {
+ arc0 = lm->ucast_feature_arc_index;
+ next0 = IP4_INPUT_NEXT_LOOKUP;
+ if (PREDICT_FALSE (ip0->ttl < 1))
+ error0 = IP4_ERROR_TIME_EXPIRED;
+ }
+
+ if (PREDICT_FALSE (ip4_address_is_multicast (&ip1->dst_address)))
+ {
+ arc1 = lm->mcast_feature_arc_index;
+ next1 = IP4_INPUT_NEXT_LOOKUP_MULTICAST;
+ }
+ else
+ {
+ arc1 = lm->ucast_feature_arc_index;
+ next1 = IP4_INPUT_NEXT_LOOKUP;
+ if (PREDICT_FALSE (ip1->ttl < 1))
+ error1 = IP4_ERROR_TIME_EXPIRED;
+ }
+
+ vnet_buffer (p0)->ip.adj_index[VLIB_RX] = ~0;
+ vnet_buffer (p1)->ip.adj_index[VLIB_RX] = ~0;
+
+ vnet_feature_arc_start (arc0, sw_if_index0, &next0, p0);
+ vnet_feature_arc_start (arc1, sw_if_index1, &next1, p1);
+
+ vlib_increment_simple_counter (cm, cpu_index, sw_if_index0, 1);
+ vlib_increment_simple_counter (cm, cpu_index, sw_if_index1, 1);
+
+ /* Punt packets with options or wrong version. */
+ if (PREDICT_FALSE (ip0->ip_version_and_header_length != 0x45))
+ error0 = (ip0->ip_version_and_header_length & 0xf) != 5 ?
+ IP4_ERROR_OPTIONS : IP4_ERROR_VERSION;
+
+ if (PREDICT_FALSE (ip1->ip_version_and_header_length != 0x45))
+ error1 = (ip1->ip_version_and_header_length & 0xf) != 5 ?
+ IP4_ERROR_OPTIONS : IP4_ERROR_VERSION;
+
+ /* Verify header checksum. */
+ if (verify_checksum)
+ {
+ ip_csum_t sum0, sum1;
+
+ ip4_partial_header_checksum_x1 (ip0, sum0);
+ ip4_partial_header_checksum_x1 (ip1, sum1);
+
+ error0 = 0xffff != ip_csum_fold (sum0) ?
+ IP4_ERROR_BAD_CHECKSUM : error0;
+ error1 = 0xffff != ip_csum_fold (sum1) ?
+ IP4_ERROR_BAD_CHECKSUM : error1;
+ }
+
+ /* Drop fragmentation offset 1 packets. */
+ error0 = ip4_get_fragment_offset (ip0) == 1 ?
+ IP4_ERROR_FRAGMENT_OFFSET_ONE : error0;
+ error1 = ip4_get_fragment_offset (ip1) == 1 ?
+ IP4_ERROR_FRAGMENT_OFFSET_ONE : error1;
+
+ /* Verify lengths. */
+ ip_len0 = clib_net_to_host_u16 (ip0->length);
+ ip_len1 = clib_net_to_host_u16 (ip1->length);
+
+ /* IP length must be at least minimal IP header. */
+ error0 = ip_len0 < sizeof (ip0[0]) ? IP4_ERROR_TOO_SHORT : error0;
+ error1 = ip_len1 < sizeof (ip1[0]) ? IP4_ERROR_TOO_SHORT : error1;
+
+ cur_len0 = vlib_buffer_length_in_chain (vm, p0);
+ cur_len1 = vlib_buffer_length_in_chain (vm, p1);
+
+ len_diff0 = cur_len0 - ip_len0;
+ len_diff1 = cur_len1 - ip_len1;
+
+ error0 = len_diff0 < 0 ? IP4_ERROR_BAD_LENGTH : error0;
+ error1 = len_diff1 < 0 ? IP4_ERROR_BAD_LENGTH : error1;
+
+ p0->error = error_node->errors[error0];
+ p1->error = error_node->errors[error1];
+
+ if (PREDICT_FALSE (error0 != IP4_ERROR_NONE))
+ {
+ if (error0 == IP4_ERROR_TIME_EXPIRED)
+ {
+ icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
+ ICMP4_time_exceeded_ttl_exceeded_in_transit,
+ 0);
+ next0 = IP4_INPUT_NEXT_ICMP_ERROR;
+ }
+ else
+ next0 = error0 != IP4_ERROR_OPTIONS ?
+ IP4_INPUT_NEXT_DROP : IP4_INPUT_NEXT_PUNT;
+ }
+ if (PREDICT_FALSE (error1 != IP4_ERROR_NONE))
+ {
+ if (error1 == IP4_ERROR_TIME_EXPIRED)
+ {
+ icmp4_error_set_vnet_buffer (p1, ICMP4_time_exceeded,
+ ICMP4_time_exceeded_ttl_exceeded_in_transit,
+ 0);
+ next1 = IP4_INPUT_NEXT_ICMP_ERROR;
+ }
+ else
+ next1 = error1 != IP4_ERROR_OPTIONS ?
+ IP4_INPUT_NEXT_DROP : IP4_INPUT_NEXT_PUNT;
+ }
+
+ 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;
+ ip4_header_t *ip0;
+ u32 sw_if_index0, pi0, ip_len0, cur_len0, next0;
+ i32 len_diff0;
+ u8 error0, arc0;
+
+ 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];
+
+ error0 = IP4_ERROR_NONE;
+
+ if (PREDICT_FALSE (ip4_address_is_multicast (&ip0->dst_address)))
+ {
+ arc0 = lm->mcast_feature_arc_index;
+ next0 = IP4_INPUT_NEXT_LOOKUP_MULTICAST;
+ }
+ else
+ {
+ arc0 = lm->ucast_feature_arc_index;
+ next0 = IP4_INPUT_NEXT_LOOKUP;
+ if (PREDICT_FALSE (ip0->ttl < 1))
+ error0 = IP4_ERROR_TIME_EXPIRED;
+ }
+
+ vnet_buffer (p0)->ip.adj_index[VLIB_RX] = ~0;
+ vnet_feature_arc_start (arc0, sw_if_index0, &next0, p0);
+
+ vlib_increment_simple_counter (cm, cpu_index, sw_if_index0, 1);
+
+ /* Punt packets with options or wrong version. */
+ if (PREDICT_FALSE (ip0->ip_version_and_header_length != 0x45))
+ error0 = (ip0->ip_version_and_header_length & 0xf) != 5 ?
+ IP4_ERROR_OPTIONS : IP4_ERROR_VERSION;
+
+ /* Verify header checksum. */
+ if (verify_checksum)
+ {
+ ip_csum_t sum0;
+
+ ip4_partial_header_checksum_x1 (ip0, sum0);
+ error0 =
+ 0xffff !=
+ ip_csum_fold (sum0) ? IP4_ERROR_BAD_CHECKSUM : error0;
+ }
+
+ /* Drop fragmentation offset 1 packets. */
+ error0 =
+ ip4_get_fragment_offset (ip0) ==
+ 1 ? IP4_ERROR_FRAGMENT_OFFSET_ONE : error0;
+
+ /* Verify lengths. */
+ ip_len0 = clib_net_to_host_u16 (ip0->length);
+
+ /* IP length must be at least minimal IP header. */
+ error0 = ip_len0 < sizeof (ip0[0]) ? IP4_ERROR_TOO_SHORT : error0;
+
+ cur_len0 = vlib_buffer_length_in_chain (vm, p0);
+ len_diff0 = cur_len0 - ip_len0;
+ error0 = len_diff0 < 0 ? IP4_ERROR_BAD_LENGTH : error0;
+
+ p0->error = error_node->errors[error0];
+ if (PREDICT_FALSE (error0 != IP4_ERROR_NONE))
+ {
+ if (error0 == IP4_ERROR_TIME_EXPIRED)
+ {
+ icmp4_error_set_vnet_buffer (p0, ICMP4_time_exceeded,
+ ICMP4_time_exceeded_ttl_exceeded_in_transit,
+ 0);
+ next0 = IP4_INPUT_NEXT_ICMP_ERROR;
+ }
+ else
+ next0 = error0 != IP4_ERROR_OPTIONS ?
+ IP4_INPUT_NEXT_DROP : IP4_INPUT_NEXT_PUNT;
+ }
+
+ 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;
+}
+
+/** \brief IPv4 input node.
+ @node ip4-input
+
+ This is the IPv4 input node: validates ip4 header checksums,
+ verifies ip header lengths, discards pkts with expired TTLs,
+ and sends pkts to the set of ip feature nodes configured on
+ the rx interface.
+
+ @param vm vlib_main_t corresponding to the current thread
+ @param node vlib_node_runtime_t
+ @param frame vlib_frame_t whose contents should be dispatched
+
+ @par Graph mechanics: buffer metadata, next index usage
+
+ @em Uses:
+ - vnet_feature_config_main_t cm corresponding to each pkt's dst address unicast /
+ multicast status.
+ - <code>b->current_config_index</code> corresponding to each pkt's
+ rx sw_if_index.
+ - This sets the per-packet graph trajectory, ensuring that
+ each packet visits the per-interface features in order.
+
+ - <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code>
+ - Indicates the @c sw_if_index value of the interface that the
+ packet was received on.
+
+ @em Sets:
+ - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code>
+ - The lookup result adjacency index.
+
+ <em>Next Indices:</em>
+ - Dispatches pkts to the (first) feature node:
+ <code> vnet_get_config_data (... &next0 ...); </code>
+ or @c error-drop
+*/
+static uword
+ip4_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ return ip4_input_inline (vm, node, frame, /* verify_checksum */ 1);
+}
+
+static uword
+ip4_input_no_checksum (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ return ip4_input_inline (vm, node, frame, /* verify_checksum */ 0);
+}
+
+static char *ip4_error_strings[] = {
+#define _(sym,string) string,
+ foreach_ip4_error
+#undef _
+};
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_input_node) = {
+ .function = ip4_input,
+ .name = "ip4-input",
+ .vector_size = sizeof (u32),
+
+ .n_errors = IP4_N_ERROR,
+ .error_strings = ip4_error_strings,
+
+ .n_next_nodes = IP4_INPUT_N_NEXT,
+ .next_nodes = {
+ [IP4_INPUT_NEXT_DROP] = "error-drop",
+ [IP4_INPUT_NEXT_PUNT] = "error-punt",
+ [IP4_INPUT_NEXT_LOOKUP] = "ip4-lookup",
+ [IP4_INPUT_NEXT_LOOKUP_MULTICAST] = "ip4-lookup-multicast",
+ [IP4_INPUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ },
+
+ .format_buffer = format_ip4_header,
+ .format_trace = format_ip4_input_trace,
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (ip4_input_node, ip4_input);
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_input_no_checksum_node,static) = {
+ .function = ip4_input_no_checksum,
+ .name = "ip4-input-no-checksum",
+ .vector_size = sizeof (u32),
+
+ .n_next_nodes = IP4_INPUT_N_NEXT,
+ .next_nodes = {
+ [IP4_INPUT_NEXT_DROP] = "error-drop",
+ [IP4_INPUT_NEXT_PUNT] = "error-punt",
+ [IP4_INPUT_NEXT_LOOKUP] = "ip4-lookup",
+ [IP4_INPUT_NEXT_LOOKUP_MULTICAST] = "ip4-lookup-multicast",
+ [IP4_INPUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ },
+
+ .format_buffer = format_ip4_header,
+ .format_trace = format_ip4_input_trace,
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (ip4_input_no_checksum_node,
+ ip4_input_no_checksum);
+
+static clib_error_t *
+ip4_init (vlib_main_t * vm)
+{
+ clib_error_t *error;
+
+ ethernet_register_input_type (vm, ETHERNET_TYPE_IP4, ip4_input_node.index);
+ ppp_register_input_protocol (vm, PPP_PROTOCOL_ip4, ip4_input_node.index);
+ hdlc_register_input_protocol (vm, HDLC_PROTOCOL_ip4, ip4_input_node.index);
+
+ {
+ pg_node_t *pn;
+ pn = pg_get_node (ip4_input_node.index);
+ pn->unformat_edit = unformat_pg_ip4_header;
+ pn = pg_get_node (ip4_input_no_checksum_node.index);
+ pn->unformat_edit = unformat_pg_ip4_header;
+ }
+
+ if ((error = vlib_call_init_function (vm, ip4_cli_init)))
+ return error;
+
+ if ((error = vlib_call_init_function (vm, ip4_source_check_init)))
+ return error;
+
+ if ((error = vlib_call_init_function
+ (vm, ip4_source_and_port_range_check_init)))
+ return error;
+
+ /* Set flow hash to something non-zero. */
+ ip4_main.flow_hash_seed = 0xdeadbeef;
+
+ /* Default TTL for packets we generate. */
+ ip4_main.host_config.ttl = 64;
+
+ return error;
+}
+
+VLIB_INIT_FUNCTION (ip4_init);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */