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,
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 ip_config_main_t * cm0, * cm1;
109 u32 pi0, sw_if_index0, next0;
110 u32 pi1, sw_if_index1, next1;
111 u8 error0, error1, cast0, cast1;
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 cast0 = ip6_address_is_multicast (&ip0->dst_address) ? VNET_MULTICAST : VNET_UNICAST;
147 cast1 = ip6_address_is_multicast (&ip1->dst_address) ? VNET_MULTICAST : VNET_UNICAST;
149 cm0 = lm->rx_config_mains + cast0;
150 cm1 = lm->rx_config_mains + cast1;
152 vnet_buffer (p0)->ip.current_config_index = vec_elt (cm0->config_index_by_sw_if_index, sw_if_index0);
153 vnet_buffer (p1)->ip.current_config_index = vec_elt (cm1->config_index_by_sw_if_index, sw_if_index1);
155 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = ~0;
156 vnet_buffer (p1)->ip.adj_index[VLIB_RX] = ~0;
158 vnet_get_config_data (&cm0->config_main,
159 &vnet_buffer (p0)->ip.current_config_index,
161 /* # bytes of config data */ 0);
162 vnet_get_config_data (&cm1->config_main,
163 &vnet_buffer (p1)->ip.current_config_index,
165 /* # bytes of config data */ 0);
167 vlib_increment_simple_counter (cm, cpu_index, sw_if_index0, 1);
168 vlib_increment_simple_counter (cm, cpu_index, sw_if_index1, 1);
170 error0 = error1 = IP6_ERROR_NONE;
172 /* Version != 6? Drop it. */
173 error0 = (clib_net_to_host_u32 (ip0->ip_version_traffic_class_and_flow_label) >> 28) != 6 ? IP6_ERROR_VERSION : error0;
174 error1 = (clib_net_to_host_u32 (ip1->ip_version_traffic_class_and_flow_label) >> 28) != 6 ? IP6_ERROR_VERSION : error1;
176 /* hop limit < 1? Drop it. for link-local broadcast packets,
177 * like dhcpv6 packets from client has hop-limit 1, which should not
180 error0 = ip0->hop_limit <= 1 ? IP6_ERROR_TIME_EXPIRED : error0;
181 error1 = ip1->hop_limit <= 1 ? IP6_ERROR_TIME_EXPIRED : error1;
183 /* L2 length must be at least minimal IP header. */
184 error0 = p0->current_length < sizeof (ip0[0]) ? IP6_ERROR_TOO_SHORT : error0;
185 error1 = p1->current_length < sizeof (ip1[0]) ? IP6_ERROR_TOO_SHORT : error1;
187 if (PREDICT_FALSE(error0 != IP6_ERROR_NONE))
189 if (error0 == IP6_ERROR_TIME_EXPIRED) {
190 icmp6_error_set_vnet_buffer(p0, ICMP6_time_exceeded,
191 ICMP6_time_exceeded_ttl_exceeded_in_transit, 0);
192 next0 = IP6_INPUT_NEXT_ICMP;
194 next0 = IP6_INPUT_NEXT_DROP;
197 if (PREDICT_FALSE(error1 != IP6_ERROR_NONE))
199 if (error1 == IP6_ERROR_TIME_EXPIRED) {
200 icmp6_error_set_vnet_buffer(p1, ICMP6_time_exceeded,
201 ICMP6_time_exceeded_ttl_exceeded_in_transit, 0);
202 next1 = IP6_INPUT_NEXT_ICMP;
204 next1 = IP6_INPUT_NEXT_DROP;
208 p0->error = error_node->errors[error0];
209 p1->error = error_node->errors[error1];
211 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
212 to_next, n_left_to_next,
213 pi0, pi1, next0, next1);
216 while (n_left_from > 0 && n_left_to_next > 0)
220 ip_config_main_t * cm0;
221 u32 pi0, sw_if_index0, next0;
231 p0 = vlib_get_buffer (vm, pi0);
232 ip0 = vlib_buffer_get_current (p0);
234 sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
235 cast0 = ip6_address_is_multicast (&ip0->dst_address) ? VNET_MULTICAST : VNET_UNICAST;
236 cm0 = lm->rx_config_mains + cast0;
237 vnet_buffer (p0)->ip.current_config_index = vec_elt (cm0->config_index_by_sw_if_index, sw_if_index0);
238 vnet_buffer (p0)->ip.adj_index[VLIB_RX] = ~0;
240 vnet_get_config_data (&cm0->config_main,
241 &vnet_buffer (p0)->ip.current_config_index,
243 /* # bytes of config data */ 0);
245 vlib_increment_simple_counter (cm, cpu_index, sw_if_index0, 1);
246 error0 = IP6_ERROR_NONE;
248 /* Version != 6? Drop it. */
249 error0 = (clib_net_to_host_u32 (ip0->ip_version_traffic_class_and_flow_label) >> 28) != 6 ? IP6_ERROR_VERSION : error0;
251 /* hop limit < 1? Drop it. for link-local broadcast packets,
252 * like dhcpv6 packets from client has hop-limit 1, which should not
255 error0 = ip0->hop_limit <= 1 ? IP6_ERROR_TIME_EXPIRED : error0;
257 /* L2 length must be at least minimal IP header. */
258 error0 = p0->current_length < sizeof (ip0[0]) ? IP6_ERROR_TOO_SHORT : error0;
260 if (PREDICT_FALSE(error0 != IP6_ERROR_NONE))
262 if (error0 == IP6_ERROR_TIME_EXPIRED) {
263 icmp6_error_set_vnet_buffer(p0, ICMP6_time_exceeded,
264 ICMP6_time_exceeded_ttl_exceeded_in_transit, 0);
265 next0 = IP6_INPUT_NEXT_ICMP;
267 next0 = IP6_INPUT_NEXT_DROP;
270 p0->error = error_node->errors[error0];
272 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
273 to_next, n_left_to_next,
277 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
280 return frame->n_vectors;
283 static char * ip6_error_strings[] = {
284 #define _(sym,string) string,
289 VLIB_REGISTER_NODE (ip6_input_node) = {
290 .function = ip6_input,
292 .vector_size = sizeof (u32),
294 .n_errors = IP6_N_ERROR,
295 .error_strings = ip6_error_strings,
297 .n_next_nodes = IP6_INPUT_N_NEXT,
299 [IP6_INPUT_NEXT_DROP] = "error-drop",
300 [IP6_INPUT_NEXT_LOOKUP] = "ip6-lookup",
301 [IP6_INPUT_NEXT_ICMP] = "ip6-icmp-error",
304 .format_buffer = format_ip6_header,
305 .format_trace = format_ip6_input_trace,
308 static clib_error_t * ip6_init (vlib_main_t * vm)
310 ethernet_register_input_type (vm, ETHERNET_TYPE_IP6,
311 ip6_input_node.index);
312 ppp_register_input_protocol (vm, PPP_PROTOCOL_ip6,
313 ip6_input_node.index);
314 hdlc_register_input_protocol (vm, HDLC_PROTOCOL_ip6,
315 ip6_input_node.index);
319 pn = pg_get_node (ip6_input_node.index);
320 pn->unformat_edit = unformat_pg_ip6_header;
323 /* Set flow hash to something non-zero. */
324 ip6_main.flow_hash_seed = 0xdeadbeef;
326 /* Default hop limit for packets we generate. */
327 ip6_main.host_config.ttl = 64;
329 return /* no error */ 0;
332 VLIB_INIT_FUNCTION (ip6_init);