FD.io VPP  v16.09
Vector Packet Processing
ip6_input.c
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1 /*
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:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
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.
14  */
15 /*
16  * ip/ip6_input.c: IP v6 input node
17  *
18  * Copyright (c) 2008 Eliot Dresselhaus
19  *
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:
27  *
28  * The above copyright notice and this permission notice shall be
29  * included in all copies or substantial portions of the Software.
30  *
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.
38  */
39 
40 #include <vnet/ip/ip.h>
41 #include <vnet/ethernet/ethernet.h>
42 #include <vnet/ppp/ppp.h>
43 #include <vnet/hdlc/hdlc.h>
44 
45 typedef struct {
46  u8 packet_data[64];
48 
49 static u8 * format_ip6_input_trace (u8 * s, va_list * va)
50 {
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 *);
54 
55  s = format (s, "%U",
57  t->packet_data, sizeof (t->packet_data));
58 
59  return s;
60 }
61 
62 typedef enum {
68 
69 /* Validate IP v6 packets and pass them either to forwarding code
70  or drop exception packets. */
71 static uword
73  vlib_node_runtime_t * node,
74  vlib_frame_t * frame)
75 {
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);
83  u32 cpu_index = os_get_cpu_number();
84 
85  from = vlib_frame_vector_args (frame);
86  n_left_from = frame->n_vectors;
87  next_index = node->cached_next_index;
88 
89  if (node->flags & VLIB_NODE_FLAG_TRACE)
90  vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
91  /* stride */ 1,
92  sizeof (ip6_input_trace_t));
93 
96 
97  while (n_left_from > 0)
98  {
99  u32 n_left_to_next;
100 
101  vlib_get_next_frame (vm, node, next_index,
102  to_next, n_left_to_next);
103 
104  while (n_left_from >= 4 && n_left_to_next >= 2)
105  {
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;
112 
113  /* Prefetch next iteration. */
114  {
115  vlib_buffer_t * p2, * p3;
116 
117  p2 = vlib_get_buffer (vm, from[2]);
118  p3 = vlib_get_buffer (vm, from[3]);
119 
120  vlib_prefetch_buffer_header (p2, LOAD);
121  vlib_prefetch_buffer_header (p3, LOAD);
122 
123  CLIB_PREFETCH (p2->data, sizeof (ip0[0]), LOAD);
124  CLIB_PREFETCH (p3->data, sizeof (ip1[0]), LOAD);
125  }
126 
127  pi0 = from[0];
128  pi1 = from[1];
129 
130  to_next[0] = pi0;
131  to_next[1] = pi1;
132  from += 2;
133  to_next += 2;
134  n_left_from -= 2;
135  n_left_to_next -= 2;
136 
137  p0 = vlib_get_buffer (vm, pi0);
138  p1 = vlib_get_buffer (vm, pi1);
139 
140  ip0 = vlib_buffer_get_current (p0);
141  ip1 = vlib_buffer_get_current (p1);
142 
143  sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
144  sw_if_index1 = vnet_buffer (p1)->sw_if_index[VLIB_RX];
145 
148 
149  cm0 = lm->rx_config_mains + cast0;
150  cm1 = lm->rx_config_mains + cast1;
151 
152  p0->current_config_index = vec_elt (cm0->config_index_by_sw_if_index, sw_if_index0);
153  p1->current_config_index = vec_elt (cm1->config_index_by_sw_if_index, sw_if_index1);
154 
155  vnet_buffer (p0)->ip.adj_index[VLIB_RX] = ~0;
156  vnet_buffer (p1)->ip.adj_index[VLIB_RX] = ~0;
157 
160  &next0,
161  /* # bytes of config data */ 0);
164  &next1,
165  /* # bytes of config data */ 0);
166 
167  vlib_increment_simple_counter (cm, cpu_index, sw_if_index0, 1);
168  vlib_increment_simple_counter (cm, cpu_index, sw_if_index1, 1);
169 
170  error0 = error1 = IP6_ERROR_NONE;
171 
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;
175 
176  /* hop limit < 1? Drop it. for link-local broadcast packets,
177  * like dhcpv6 packets from client has hop-limit 1, which should not
178  * be dropped.
179  */
180  error0 = ip0->hop_limit < 1 ? IP6_ERROR_TIME_EXPIRED : error0;
181  error1 = ip1->hop_limit < 1 ? IP6_ERROR_TIME_EXPIRED : error1;
182 
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;
186 
187  if (PREDICT_FALSE(error0 != IP6_ERROR_NONE))
188  {
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);
193  } else {
194  next0 = IP6_INPUT_NEXT_DROP;
195  }
196  }
197  if (PREDICT_FALSE(error1 != IP6_ERROR_NONE))
198  {
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);
203  } else {
204  next1 = IP6_INPUT_NEXT_DROP;
205  }
206  }
207 
208  p0->error = error_node->errors[error0];
209  p1->error = error_node->errors[error1];
210 
211  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
212  to_next, n_left_to_next,
213  pi0, pi1, next0, next1);
214  }
215 
216  while (n_left_from > 0 && n_left_to_next > 0)
217  {
218  vlib_buffer_t * p0;
219  ip6_header_t * ip0;
220  ip_config_main_t * cm0;
221  u32 pi0, sw_if_index0, next0;
222  u8 error0, cast0;
223 
224  pi0 = from[0];
225  to_next[0] = pi0;
226  from += 1;
227  to_next += 1;
228  n_left_from -= 1;
229  n_left_to_next -= 1;
230 
231  p0 = vlib_get_buffer (vm, pi0);
232  ip0 = vlib_buffer_get_current (p0);
233 
234  sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
236  cm0 = lm->rx_config_mains + cast0;
237  p0->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;
239 
242  &next0,
243  /* # bytes of config data */ 0);
244 
245  vlib_increment_simple_counter (cm, cpu_index, sw_if_index0, 1);
246  error0 = IP6_ERROR_NONE;
247 
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;
250 
251  /* hop limit < 1? Drop it. for link-local broadcast packets,
252  * like dhcpv6 packets from client has hop-limit 1, which should not
253  * be dropped.
254  */
255  error0 = ip0->hop_limit < 1 ? IP6_ERROR_TIME_EXPIRED : error0;
256 
257  /* L2 length must be at least minimal IP header. */
258  error0 = p0->current_length < sizeof (ip0[0]) ? IP6_ERROR_TOO_SHORT : error0;
259 
260  if (PREDICT_FALSE(error0 != IP6_ERROR_NONE))
261  {
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);
266  } else {
267  next0 = IP6_INPUT_NEXT_DROP;
268  }
269  }
270  p0->error = error_node->errors[error0];
271 
272  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
273  to_next, n_left_to_next,
274  pi0, next0);
275  }
276 
277  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
278  }
279 
280  return frame->n_vectors;
281 }
282 
283 static char * ip6_error_strings[] = {
284 #define _(sym,string) string,
286 #undef _
287 };
288 
290  .function = ip6_input,
291  .name = "ip6-input",
292  .vector_size = sizeof (u32),
293 
294  .n_errors = IP6_N_ERROR,
295  .error_strings = ip6_error_strings,
296 
297  .n_next_nodes = IP6_INPUT_N_NEXT,
298  .next_nodes = {
299  [IP6_INPUT_NEXT_DROP] = "error-drop",
300  [IP6_INPUT_NEXT_LOOKUP] = "ip6-lookup",
301  [IP6_INPUT_NEXT_ICMP_ERROR] = "ip6-icmp-error",
302  },
303 
304  .format_buffer = format_ip6_header,
305  .format_trace = format_ip6_input_trace,
306 };
307 
309 
311 {
312  ethernet_register_input_type (vm, ETHERNET_TYPE_IP6,
313  ip6_input_node.index);
314  ppp_register_input_protocol (vm, PPP_PROTOCOL_ip6,
315  ip6_input_node.index);
316  hdlc_register_input_protocol (vm, HDLC_PROTOCOL_ip6,
317  ip6_input_node.index);
318 
319  {
320  pg_node_t * pn;
321  pn = pg_get_node (ip6_input_node.index);
323  }
324 
325  /* Set flow hash to something non-zero. */
326  ip6_main.flow_hash_seed = 0xdeadbeef;
327 
328  /* Default hop limit for packets we generate. */
329  ip6_main.host_config.ttl = 64;
330 
331  return /* no error */ 0;
332 }
333 
void vlib_put_next_frame(vlib_main_t *vm, vlib_node_runtime_t *r, u32 next_index, u32 n_vectors_left)
Release pointer to next frame vector data.
Definition: main.c:457
static void vlib_increment_simple_counter(vlib_simple_counter_main_t *cm, u32 cpu_index, u32 index, u32 increment)
Increment a simple counter.
Definition: counter.h:78
#define CLIB_UNUSED(x)
Definition: clib.h:79
u32 * config_index_by_sw_if_index
Definition: lookup.h:369
static u8 * format_ip6_input_trace(u8 *s, va_list *va)
Definition: ip6_input.c:49
u32 current_config_index
Used by feature subgraph arcs to visit enabled feature nodes.
Definition: buffer.h:121
vnet_interface_main_t interface_main
Definition: vnet.h:64
u32 flow_hash_seed
Definition: ip6.h:165
u8 ttl
Definition: ip6.h:169
ip_config_main_t rx_config_mains[VNET_N_CAST]
rx/tx interface/feature configuration.
Definition: lookup.h:452
static clib_error_t * ip6_init(vlib_main_t *vm)
Definition: ip6_input.c:310
vlib_error_t * errors
Definition: node.h:418
static pg_node_t * pg_get_node(uword node_index)
Definition: pg.h:343
vnet_main_t * vnet_get_main(void)
Definition: misc.c:45
unformat_function_t unformat_pg_ip6_header
Definition: format.h:91
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:111
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:187
vlib_node_registration_t ip6_input_node
(constructor) VLIB_REGISTER_NODE (ip6_input_node)
Definition: ip6_input.c:289
#define vec_elt_at_index(v, i)
Get vector value at index i checking that i is in bounds.
A collection of simple counters.
Definition: counter.h:59
void ppp_register_input_protocol(vlib_main_t *vm, ppp_protocol_t protocol, u32 node_index)
Definition: node.c:305
void icmp6_error_set_vnet_buffer(vlib_buffer_t *b, u8 type, u8 code, u32 data)
Definition: icmp6.c:492
u16 current_length
Nbytes between current data and the end of this buffer.
Definition: buffer.h:82
uword os_get_cpu_number(void)
Definition: unix-misc.c:224
static void * vnet_get_config_data(vnet_config_main_t *cm, u32 *config_index, u32 *next_index, u32 n_data_bytes)
Definition: config.h:122
#define PREDICT_FALSE(x)
Definition: clib.h:97
vlib_simple_counter_main_t * sw_if_counters
Definition: interface.h:500
#define vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1)
Finish enqueueing two buffers forward in the graph.
Definition: buffer_node.h:70
#define vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next, n_left_to_next, bi0, next0)
Finish enqueueing one buffer forward in the graph.
Definition: buffer_node.h:130
#define vlib_get_next_frame(vm, node, next_index, vectors, n_vectors_left)
Get pointer to next frame vector data by (vlib_node_runtime_t, next_index).
Definition: node_funcs.h:348
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:118
struct ip6_main_t::@137 host_config
u16 n_vectors
Definition: node.h:344
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:82
static vlib_node_runtime_t * vlib_node_get_runtime(vlib_main_t *vm, u32 node_index)
Get node runtime by node index.
Definition: node_funcs.h:88
unformat_function_t * unformat_edit
Definition: pg.h:299
static char * ip6_error_strings[]
Definition: ip6_input.c:283
void hdlc_register_input_protocol(vlib_main_t *vm, hdlc_protocol_t protocol, u32 node_index)
Definition: node.c:319
u16 cached_next_index
Definition: node.h:462
unsigned int u32
Definition: types.h:88
#define vnet_buffer(b)
Definition: buffer.h:335
ip6_main_t ip6_main
Definition: ip6_forward.c:2955
ip_lookup_main_t lookup_main
Definition: ip6.h:110
u8 * format(u8 *s, char *fmt,...)
Definition: format.c:418
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:259
ip6_input_next_t
Definition: ip6_input.c:62
void ethernet_register_input_type(vlib_main_t *vm, ethernet_type_t type, u32 node_index)
Definition: node.c:1182
u64 uword
Definition: types.h:112
#define vec_elt(v, i)
Get vector value at index i.
u32 ip_version_traffic_class_and_flow_label
Definition: ip6_packet.h:285
void vlib_trace_frame_buffers_only(vlib_main_t *vm, vlib_node_runtime_t *node, u32 *buffers, uword n_buffers, uword next_buffer_stride, uword n_buffer_data_bytes_in_trace)
Definition: trace.c:45
static uword ip6_address_is_multicast(ip6_address_t *a)
Definition: ip6_packet.h:121
unsigned char u8
Definition: types.h:56
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:251
#define foreach_ip6_error
Definition: ip6_error.h:43
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:163
#define VLIB_NODE_FUNCTION_MULTIARCH(node, fn)
Definition: node.h:158
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:143
u8 data[0]
Packet data.
Definition: buffer.h:151
static uword ip6_input(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: ip6_input.c:72
format_function_t format_ip6_header
Definition: format.h:90
u8 packet_data[64]
Definition: ip6_input.c:46
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:69
Definition: pg.h:297
vnet_config_main_t config_main
Definition: lookup.h:367
Definition: defs.h:46
ip6_address_t dst_address
Definition: ip6_packet.h:298