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>
49 static u8 * format_ip6_input_trace (u8 * s, va_list * va)
51 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
52 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
53 ip6_input_trace_t * t = va_arg (*va, ip6_input_trace_t *);
57 t->packet_data, sizeof (t->packet_data));
64 IP6_INPUT_NEXT_LOOKUP,
65 IP6_INPUT_NEXT_ICMP_ERROR,
69 /* Validate IP v6 packets and pass them either to forwarding code
70 or drop exception packets. */
72 ip6_input (vlib_main_t * vm,
73 vlib_node_runtime_t * node,
76 vnet_main_t * vnm = vnet_get_main();
77 ip6_main_t * im = &ip6_main;
78 ip_lookup_main_t * lm = &im->lookup_main;
79 u32 n_left_from, * from, * to_next;
80 ip6_input_next_t next_index;
81 vlib_node_runtime_t * error_node = vlib_node_get_runtime (vm, ip6_input_node.index);
82 vlib_simple_counter_main_t * cm;
83 u32 cpu_index = os_get_cpu_number();
85 from = vlib_frame_vector_args (frame);
86 n_left_from = frame->n_vectors;
87 next_index = node->cached_next_index;
89 if (node->flags & VLIB_NODE_FLAG_TRACE)
90 vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
92 sizeof (ip6_input_trace_t));
94 cm = vec_elt_at_index (vnm->interface_main.sw_if_counters,
95 VNET_INTERFACE_COUNTER_IP6);
97 while (n_left_from > 0)
101 vlib_get_next_frame (vm, node, next_index,
102 to_next, n_left_to_next);
104 while (n_left_from >= 4 && n_left_to_next >= 2)
106 vlib_buffer_t * p0, * p1;
107 ip6_header_t * ip0, * ip1;
108 u32 pi0, sw_if_index0, next0 = 0;
109 u32 pi1, sw_if_index1, next1 = 0;
110 u8 error0, error1, arc0, arc1;
112 /* Prefetch next iteration. */
114 vlib_buffer_t * p2, * p3;
116 p2 = vlib_get_buffer (vm, from[2]);
117 p3 = vlib_get_buffer (vm, from[3]);
119 vlib_prefetch_buffer_header (p2, LOAD);
120 vlib_prefetch_buffer_header (p3, LOAD);
122 CLIB_PREFETCH (p2->data, sizeof (ip0[0]), LOAD);
123 CLIB_PREFETCH (p3->data, sizeof (ip1[0]), LOAD);
136 p0 = vlib_get_buffer (vm, pi0);
137 p1 = vlib_get_buffer (vm, pi1);
139 ip0 = vlib_buffer_get_current (p0);
140 ip1 = vlib_buffer_get_current (p1);
142 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
143 sw_if_index1 = vnet_buffer (p1)->sw_if_index[VLIB_RX];
145 arc0 = ip6_address_is_multicast (&ip0->dst_address) ? lm->mcast_feature_arc_index : lm->ucast_feature_arc_index;
146 arc1 = ip6_address_is_multicast (&ip1->dst_address) ? lm->mcast_feature_arc_index : lm->ucast_feature_arc_index;
148 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = ~0;
149 vnet_buffer (p1)->ip.adj_index[VLIB_RX] = ~0;
151 vnet_feature_arc_start (arc0, sw_if_index0, &next0, p0);
152 vnet_feature_arc_start (arc1, sw_if_index1, &next1, p1);
154 vlib_increment_simple_counter (cm, cpu_index, sw_if_index0, 1);
155 vlib_increment_simple_counter (cm, cpu_index, sw_if_index1, 1);
157 error0 = error1 = IP6_ERROR_NONE;
159 /* Version != 6? Drop it. */
160 error0 = (clib_net_to_host_u32 (ip0->ip_version_traffic_class_and_flow_label) >> 28) != 6 ? IP6_ERROR_VERSION : error0;
161 error1 = (clib_net_to_host_u32 (ip1->ip_version_traffic_class_and_flow_label) >> 28) != 6 ? IP6_ERROR_VERSION : error1;
163 /* hop limit < 1? Drop it. for link-local broadcast packets,
164 * like dhcpv6 packets from client has hop-limit 1, which should not
167 error0 = ip0->hop_limit < 1 ? IP6_ERROR_TIME_EXPIRED : error0;
168 error1 = ip1->hop_limit < 1 ? IP6_ERROR_TIME_EXPIRED : error1;
170 /* L2 length must be at least minimal IP header. */
171 error0 = p0->current_length < sizeof (ip0[0]) ? IP6_ERROR_TOO_SHORT : error0;
172 error1 = p1->current_length < sizeof (ip1[0]) ? IP6_ERROR_TOO_SHORT : error1;
174 if (PREDICT_FALSE(error0 != IP6_ERROR_NONE))
176 if (error0 == IP6_ERROR_TIME_EXPIRED) {
177 icmp6_error_set_vnet_buffer(p0, ICMP6_time_exceeded,
178 ICMP6_time_exceeded_ttl_exceeded_in_transit, 0);
179 next0 = IP6_INPUT_NEXT_ICMP_ERROR;
181 next0 = IP6_INPUT_NEXT_DROP;
184 if (PREDICT_FALSE(error1 != IP6_ERROR_NONE))
186 if (error1 == IP6_ERROR_TIME_EXPIRED) {
187 icmp6_error_set_vnet_buffer(p1, ICMP6_time_exceeded,
188 ICMP6_time_exceeded_ttl_exceeded_in_transit, 0);
189 next1 = IP6_INPUT_NEXT_ICMP_ERROR;
191 next1 = IP6_INPUT_NEXT_DROP;
195 p0->error = error_node->errors[error0];
196 p1->error = error_node->errors[error1];
198 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
199 to_next, n_left_to_next,
200 pi0, pi1, next0, next1);
203 while (n_left_from > 0 && n_left_to_next > 0)
207 u32 pi0, sw_if_index0, next0 = 0;
217 p0 = vlib_get_buffer (vm, pi0);
218 ip0 = vlib_buffer_get_current (p0);
220 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
221 arc0 = ip6_address_is_multicast (&ip0->dst_address) ? lm->mcast_feature_arc_index : lm->ucast_feature_arc_index;
222 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = ~0;
223 vnet_feature_arc_start (arc0, sw_if_index0, &next0, p0);
225 vlib_increment_simple_counter (cm, cpu_index, sw_if_index0, 1);
226 error0 = IP6_ERROR_NONE;
228 /* Version != 6? Drop it. */
229 error0 = (clib_net_to_host_u32 (ip0->ip_version_traffic_class_and_flow_label) >> 28) != 6 ? IP6_ERROR_VERSION : error0;
231 /* hop limit < 1? Drop it. for link-local broadcast packets,
232 * like dhcpv6 packets from client has hop-limit 1, which should not
235 error0 = ip0->hop_limit < 1 ? IP6_ERROR_TIME_EXPIRED : error0;
237 /* L2 length must be at least minimal IP header. */
238 error0 = p0->current_length < sizeof (ip0[0]) ? IP6_ERROR_TOO_SHORT : error0;
240 if (PREDICT_FALSE(error0 != IP6_ERROR_NONE))
242 if (error0 == IP6_ERROR_TIME_EXPIRED) {
243 icmp6_error_set_vnet_buffer(p0, ICMP6_time_exceeded,
244 ICMP6_time_exceeded_ttl_exceeded_in_transit, 0);
245 next0 = IP6_INPUT_NEXT_ICMP_ERROR;
247 next0 = IP6_INPUT_NEXT_DROP;
250 p0->error = error_node->errors[error0];
252 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
253 to_next, n_left_to_next,
257 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
260 return frame->n_vectors;
263 static char * ip6_error_strings[] = {
264 #define _(sym,string) string,
269 VLIB_REGISTER_NODE (ip6_input_node) = {
270 .function = ip6_input,
272 .vector_size = sizeof (u32),
274 .n_errors = IP6_N_ERROR,
275 .error_strings = ip6_error_strings,
277 .n_next_nodes = IP6_INPUT_N_NEXT,
279 [IP6_INPUT_NEXT_DROP] = "error-drop",
280 [IP6_INPUT_NEXT_LOOKUP] = "ip6-lookup",
281 [IP6_INPUT_NEXT_ICMP_ERROR] = "ip6-icmp-error",
284 .format_buffer = format_ip6_header,
285 .format_trace = format_ip6_input_trace,
288 VLIB_NODE_FUNCTION_MULTIARCH (ip6_input_node, ip6_input)
290 static clib_error_t * ip6_init (vlib_main_t * vm)
292 ethernet_register_input_type (vm, ETHERNET_TYPE_IP6,
293 ip6_input_node.index);
294 ppp_register_input_protocol (vm, PPP_PROTOCOL_ip6,
295 ip6_input_node.index);
296 hdlc_register_input_protocol (vm, HDLC_PROTOCOL_ip6,
297 ip6_input_node.index);
301 pn = pg_get_node (ip6_input_node.index);
302 pn->unformat_edit = unformat_pg_ip6_header;
305 /* Set flow hash to something non-zero. */
306 ip6_main.flow_hash_seed = 0xdeadbeef;
308 /* Default hop limit for packets we generate. */
309 ip6_main.host_config.ttl = 64;
311 return /* no error */ 0;
314 VLIB_INIT_FUNCTION (ip6_init);