2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 * ip/ip6_input.c: IP v6 input node
18 * Copyright (c) 2008 Eliot Dresselhaus
20 * Permission is hereby granted, free of charge, to any person obtaining
21 * a copy of this software and associated documentation files (the
22 * "Software"), to deal in the Software without restriction, including
23 * without limitation the rights to use, copy, modify, merge, publish,
24 * distribute, sublicense, and/or sell copies of the Software, and to
25 * permit persons to whom the Software is furnished to do so, subject to
26 * the following conditions:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 #include <vnet/ip/ip.h>
41 #include <vnet/ethernet/ethernet.h>
42 #include <vnet/ppp/ppp.h>
43 #include <vnet/hdlc/hdlc.h>
51 format_ip6_input_trace (u8 * s, va_list * va)
53 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
54 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
55 ip6_input_trace_t *t = va_arg (*va, ip6_input_trace_t *);
58 format_ip6_header, t->packet_data, sizeof (t->packet_data));
66 IP6_INPUT_NEXT_LOOKUP,
67 IP6_INPUT_NEXT_LOOKUP_MULTICAST,
68 IP6_INPUT_NEXT_ICMP_ERROR,
72 /* Validate IP v6 packets and pass them either to forwarding code
73 or drop exception packets. */
75 ip6_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
77 vnet_main_t *vnm = vnet_get_main ();
78 ip6_main_t *im = &ip6_main;
79 ip_lookup_main_t *lm = &im->lookup_main;
80 u32 n_left_from, *from, *to_next;
81 ip6_input_next_t next_index;
82 vlib_node_runtime_t *error_node =
83 vlib_node_get_runtime (vm, ip6_input_node.index);
84 vlib_simple_counter_main_t *cm;
85 u32 thread_index = vlib_get_thread_index ();
87 from = vlib_frame_vector_args (frame);
88 n_left_from = frame->n_vectors;
89 next_index = node->cached_next_index;
91 if (node->flags & VLIB_NODE_FLAG_TRACE)
92 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
94 sizeof (ip6_input_trace_t));
96 cm = vec_elt_at_index (vnm->interface_main.sw_if_counters,
97 VNET_INTERFACE_COUNTER_IP6);
99 while (n_left_from > 0)
103 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
105 while (n_left_from >= 4 && n_left_to_next >= 2)
107 vlib_buffer_t *p0, *p1;
108 ip6_header_t *ip0, *ip1;
109 u32 pi0, sw_if_index0, next0 = 0;
110 u32 pi1, sw_if_index1, next1 = 0;
111 u8 error0, error1, arc0, arc1;
113 /* Prefetch next iteration. */
115 vlib_buffer_t *p2, *p3;
117 p2 = vlib_get_buffer (vm, from[2]);
118 p3 = vlib_get_buffer (vm, from[3]);
120 vlib_prefetch_buffer_header (p2, LOAD);
121 vlib_prefetch_buffer_header (p3, LOAD);
123 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), LOAD);
124 CLIB_PREFETCH (p3->data, sizeof (ip1[0]), LOAD);
137 p0 = vlib_get_buffer (vm, pi0);
138 p1 = vlib_get_buffer (vm, pi1);
140 ip0 = vlib_buffer_get_current (p0);
141 ip1 = vlib_buffer_get_current (p1);
143 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
144 sw_if_index1 = vnet_buffer (p1)->sw_if_index[VLIB_RX];
146 if (PREDICT_FALSE (ip6_address_is_multicast (&ip0->dst_address)))
148 arc0 = lm->mcast_feature_arc_index;
149 next0 = IP6_INPUT_NEXT_LOOKUP_MULTICAST;
153 arc0 = lm->ucast_feature_arc_index;
154 next0 = IP6_INPUT_NEXT_LOOKUP;
157 if (PREDICT_FALSE (ip6_address_is_multicast (&ip1->dst_address)))
159 arc1 = lm->mcast_feature_arc_index;
160 next1 = IP6_INPUT_NEXT_LOOKUP_MULTICAST;
164 arc1 = lm->ucast_feature_arc_index;
165 next1 = IP6_INPUT_NEXT_LOOKUP;
168 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = ~0;
169 vnet_buffer (p1)->ip.adj_index[VLIB_RX] = ~0;
171 vnet_feature_arc_start (arc0, sw_if_index0, &next0, p0);
172 vnet_feature_arc_start (arc1, sw_if_index1, &next1, p1);
174 vlib_increment_simple_counter (cm, thread_index, sw_if_index0, 1);
175 vlib_increment_simple_counter (cm, thread_index, sw_if_index1, 1);
177 error0 = error1 = IP6_ERROR_NONE;
179 /* Version != 6? Drop it. */
181 (clib_net_to_host_u32
182 (ip0->ip_version_traffic_class_and_flow_label) >> 28) !=
183 6 ? IP6_ERROR_VERSION : error0;
185 (clib_net_to_host_u32
186 (ip1->ip_version_traffic_class_and_flow_label) >> 28) !=
187 6 ? IP6_ERROR_VERSION : error1;
189 /* hop limit < 1? Drop it. for link-local broadcast packets,
190 * like dhcpv6 packets from client has hop-limit 1, which should not
193 error0 = ip0->hop_limit < 1 ? IP6_ERROR_TIME_EXPIRED : error0;
194 error1 = ip1->hop_limit < 1 ? IP6_ERROR_TIME_EXPIRED : error1;
196 /* L2 length must be at least minimal IP header. */
199 sizeof (ip0[0]) ? IP6_ERROR_TOO_SHORT : error0;
202 sizeof (ip1[0]) ? IP6_ERROR_TOO_SHORT : error1;
204 if (PREDICT_FALSE (error0 != IP6_ERROR_NONE))
206 if (error0 == IP6_ERROR_TIME_EXPIRED)
208 icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
209 ICMP6_time_exceeded_ttl_exceeded_in_transit,
211 next0 = IP6_INPUT_NEXT_ICMP_ERROR;
215 next0 = IP6_INPUT_NEXT_DROP;
218 if (PREDICT_FALSE (error1 != IP6_ERROR_NONE))
220 if (error1 == IP6_ERROR_TIME_EXPIRED)
222 icmp6_error_set_vnet_buffer (p1, ICMP6_time_exceeded,
223 ICMP6_time_exceeded_ttl_exceeded_in_transit,
225 next1 = IP6_INPUT_NEXT_ICMP_ERROR;
229 next1 = IP6_INPUT_NEXT_DROP;
233 p0->error = error_node->errors[error0];
234 p1->error = error_node->errors[error1];
236 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
237 to_next, n_left_to_next,
238 pi0, pi1, next0, next1);
241 while (n_left_from > 0 && n_left_to_next > 0)
245 u32 pi0, sw_if_index0, next0 = 0;
255 p0 = vlib_get_buffer (vm, pi0);
256 ip0 = vlib_buffer_get_current (p0);
258 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
259 if (PREDICT_FALSE (ip6_address_is_multicast (&ip0->dst_address)))
261 arc0 = lm->mcast_feature_arc_index;
262 next0 = IP6_INPUT_NEXT_LOOKUP_MULTICAST;
266 arc0 = lm->ucast_feature_arc_index;
267 next0 = IP6_INPUT_NEXT_LOOKUP;
270 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = ~0;
271 vnet_feature_arc_start (arc0, sw_if_index0, &next0, p0);
273 vlib_increment_simple_counter (cm, thread_index, sw_if_index0, 1);
274 error0 = IP6_ERROR_NONE;
276 /* Version != 6? Drop it. */
278 (clib_net_to_host_u32
279 (ip0->ip_version_traffic_class_and_flow_label) >> 28) !=
280 6 ? IP6_ERROR_VERSION : error0;
282 /* hop limit < 1? Drop it. for link-local broadcast packets,
283 * like dhcpv6 packets from client has hop-limit 1, which should not
286 error0 = ip0->hop_limit < 1 ? IP6_ERROR_TIME_EXPIRED : error0;
288 /* L2 length must be at least minimal IP header. */
291 sizeof (ip0[0]) ? IP6_ERROR_TOO_SHORT : error0;
293 if (PREDICT_FALSE (error0 != IP6_ERROR_NONE))
295 if (error0 == IP6_ERROR_TIME_EXPIRED)
297 icmp6_error_set_vnet_buffer (p0, ICMP6_time_exceeded,
298 ICMP6_time_exceeded_ttl_exceeded_in_transit,
300 next0 = IP6_INPUT_NEXT_ICMP_ERROR;
304 next0 = IP6_INPUT_NEXT_DROP;
307 p0->error = error_node->errors[error0];
309 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
310 to_next, n_left_to_next,
314 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
317 return frame->n_vectors;
320 static char *ip6_error_strings[] = {
321 #define _(sym,string) string,
327 VLIB_REGISTER_NODE (ip6_input_node) = {
328 .function = ip6_input,
330 .vector_size = sizeof (u32),
332 .n_errors = IP6_N_ERROR,
333 .error_strings = ip6_error_strings,
335 .n_next_nodes = IP6_INPUT_N_NEXT,
337 [IP6_INPUT_NEXT_DROP] = "error-drop",
338 [IP6_INPUT_NEXT_LOOKUP] = "ip6-lookup",
339 [IP6_INPUT_NEXT_ICMP_ERROR] = "ip6-icmp-error",
340 [IP6_INPUT_NEXT_LOOKUP_MULTICAST] = "ip6-mfib-forward-lookup",
343 .format_buffer = format_ip6_header,
344 .format_trace = format_ip6_input_trace,
348 VLIB_NODE_FUNCTION_MULTIARCH (ip6_input_node, ip6_input)
349 static clib_error_t *ip6_init (vlib_main_t * vm)
351 ethernet_register_input_type (vm, ETHERNET_TYPE_IP6, ip6_input_node.index);
352 ppp_register_input_protocol (vm, PPP_PROTOCOL_ip6, ip6_input_node.index);
353 hdlc_register_input_protocol (vm, HDLC_PROTOCOL_ip6, ip6_input_node.index);
357 pn = pg_get_node (ip6_input_node.index);
358 pn->unformat_edit = unformat_pg_ip6_header;
361 /* Set flow hash to something non-zero. */
362 ip6_main.flow_hash_seed = 0xdeadbeef;
364 /* Default hop limit for packets we generate. */
365 ip6_main.host_config.ttl = 64;
367 return /* no error */ 0;
370 VLIB_INIT_FUNCTION (ip6_init);
373 * fd.io coding-style-patch-verification: ON
376 * eval: (c-set-style "gnu")