FD.io VPP  v19.04-6-g6f05f72
Vector Packet Processing
ip6_format.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_format.c: ip6 formatting
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 
42 /* Format an IP6 address. */
43 u8 *
44 format_ip6_address (u8 * s, va_list * args)
45 {
46  ip6_address_t *a = va_arg (*args, ip6_address_t *);
47  u32 max_zero_run = 0, this_zero_run = 0;
48  int max_zero_run_index = -1, this_zero_run_index = 0;
49  int in_zero_run = 0, i;
50  int last_double_colon = 0;
51 
52  /* Ugh, this is a pain. Scan forward looking for runs of 0's */
53  for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
54  {
55  if (a->as_u16[i] == 0)
56  {
57  if (in_zero_run)
58  this_zero_run++;
59  else
60  {
61  in_zero_run = 1;
62  this_zero_run = 1;
63  this_zero_run_index = i;
64  }
65  }
66  else
67  {
68  if (in_zero_run)
69  {
70  /* offer to compress the biggest run of > 1 zero */
71  if (this_zero_run > max_zero_run && this_zero_run > 1)
72  {
73  max_zero_run_index = this_zero_run_index;
74  max_zero_run = this_zero_run;
75  }
76  }
77  in_zero_run = 0;
78  this_zero_run = 0;
79  }
80  }
81 
82  if (in_zero_run)
83  {
84  if (this_zero_run > max_zero_run && this_zero_run > 1)
85  {
86  max_zero_run_index = this_zero_run_index;
87  max_zero_run = this_zero_run;
88  }
89  }
90 
91  for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
92  {
93  if (i == max_zero_run_index)
94  {
95  s = format (s, "::");
96  i += max_zero_run - 1;
97  last_double_colon = 1;
98  }
99  else
100  {
101  s = format (s, "%s%x",
102  (last_double_colon || i == 0) ? "" : ":",
103  clib_net_to_host_u16 (a->as_u16[i]));
104  last_double_colon = 0;
105  }
106  }
107 
108  return s;
109 }
110 
111 /* Format an IP6 route destination and length. */
112 u8 *
113 format_ip6_address_and_length (u8 * s, va_list * args)
114 {
115  ip6_address_t *a = va_arg (*args, ip6_address_t *);
116  u8 l = va_arg (*args, u32);
117  return format (s, "%U/%d", format_ip6_address, a, l);
118 }
119 
120 u8 *
121 format_ip6_address_and_mask (u8 * s, va_list * args)
122 {
123  ip6_address_and_mask_t *am = va_arg (*args, ip6_address_and_mask_t *);
124 
125  if (am->addr.as_u64[0] == 0 && am->addr.as_u64[1] == 0 &&
126  am->mask.as_u64[0] == 0 && am->mask.as_u64[1] == 0)
127  return format (s, "any");
128 
129  if (am->mask.as_u64[0] == ~0 && am->mask.as_u64[1] == ~0)
130  return format (s, "%U", format_ip4_address, &am->addr);
131 
132  return format (s, "%U/%U", format_ip6_address, &am->addr,
133  format_ip4_address, &am->mask);
134 }
135 
136 
137 /* Parse an IP6 address. */
138 uword
139 unformat_ip6_address (unformat_input_t * input, va_list * args)
140 {
141  ip6_address_t *result = va_arg (*args, ip6_address_t *);
142  u16 hex_quads[8];
143  uword hex_quad, n_hex_quads, hex_digit, n_hex_digits;
144  uword c, n_colon, double_colon_index;
145 
146  n_hex_quads = hex_quad = n_hex_digits = n_colon = 0;
147  double_colon_index = ARRAY_LEN (hex_quads);
148  while ((c = unformat_get_input (input)) != UNFORMAT_END_OF_INPUT)
149  {
150  hex_digit = 16;
151  if (c >= '0' && c <= '9')
152  hex_digit = c - '0';
153  else if (c >= 'a' && c <= 'f')
154  hex_digit = c + 10 - 'a';
155  else if (c >= 'A' && c <= 'F')
156  hex_digit = c + 10 - 'A';
157  else if (c == ':' && n_colon < 2)
158  n_colon++;
159  else
160  {
161  unformat_put_input (input);
162  break;
163  }
164 
165  /* Too many hex quads. */
166  if (n_hex_quads >= ARRAY_LEN (hex_quads))
167  return 0;
168 
169  if (hex_digit < 16)
170  {
171  hex_quad = (hex_quad << 4) | hex_digit;
172 
173  /* Hex quad must fit in 16 bits. */
174  if (n_hex_digits >= 4)
175  return 0;
176 
177  n_colon = 0;
178  n_hex_digits++;
179  }
180 
181  /* Save position of :: */
182  if (n_colon == 2)
183  {
184  /* More than one :: ? */
185  if (double_colon_index < ARRAY_LEN (hex_quads))
186  return 0;
187  double_colon_index = n_hex_quads;
188  }
189 
190  if (n_colon > 0 && n_hex_digits > 0)
191  {
192  hex_quads[n_hex_quads++] = hex_quad;
193  hex_quad = 0;
194  n_hex_digits = 0;
195  }
196  }
197 
198  if (n_hex_digits > 0)
199  hex_quads[n_hex_quads++] = hex_quad;
200 
201  {
202  word i;
203 
204  /* Expand :: to appropriate number of zero hex quads. */
205  if (double_colon_index < ARRAY_LEN (hex_quads))
206  {
207  word n_zero = ARRAY_LEN (hex_quads) - n_hex_quads;
208 
209  for (i = n_hex_quads - 1; i >= (signed) double_colon_index; i--)
210  hex_quads[n_zero + i] = hex_quads[i];
211 
212  for (i = 0; i < n_zero; i++)
213  {
214  ASSERT ((double_colon_index + i) < ARRAY_LEN (hex_quads));
215  hex_quads[double_colon_index + i] = 0;
216  }
217 
218  n_hex_quads = ARRAY_LEN (hex_quads);
219  }
220 
221  /* Too few hex quads given. */
222  if (n_hex_quads < ARRAY_LEN (hex_quads))
223  return 0;
224 
225  for (i = 0; i < ARRAY_LEN (hex_quads); i++)
226  result->as_u16[i] = clib_host_to_net_u16 (hex_quads[i]);
227 
228  return 1;
229  }
230 }
231 
232 uword
234 {
235  ip6_address_and_mask_t *am = va_arg (*args, ip6_address_and_mask_t *);
236  ip6_address_t addr, mask;
237 
238  clib_memset (&addr, 0, sizeof (ip6_address_t));
239  clib_memset (&mask, 0, sizeof (ip6_address_t));
240 
241  if (unformat (input, "any"))
242  ;
243  else if (unformat (input, "%U/%U", unformat_ip6_address, &addr,
244  unformat_ip6_address, &mask))
245  ;
246  else if (unformat (input, "%U", unformat_ip6_address, &addr))
247  mask.as_u64[0] = mask.as_u64[1] = ~0;
248  else
249  return 0;
250 
251  am->addr.as_u64[0] = addr.as_u64[0];
252  am->addr.as_u64[1] = addr.as_u64[1];
253  am->mask.as_u64[0] = mask.as_u64[0];
254  am->mask.as_u64[1] = mask.as_u64[1];
255  return 1;
256 }
257 
258 /* Format an IP6 header. */
259 u8 *
260 format_ip6_header (u8 * s, va_list * args)
261 {
262  ip6_header_t *ip = va_arg (*args, ip6_header_t *);
263  u32 max_header_bytes = va_arg (*args, u32);
264  u32 i, ip_version, traffic_class, flow_label;
265  u32 indent;
266 
267  /* Nothing to do. */
268  if (max_header_bytes < sizeof (ip[0]))
269  return format (s, "IP header truncated");
270 
271  indent = format_get_indent (s);
272  indent += 2;
273 
274  s = format (s, "%U: %U -> %U",
278 
279  i = clib_net_to_host_u32 (ip->ip_version_traffic_class_and_flow_label);
280  ip_version = (i >> 28);
281  traffic_class = (i >> 20) & 0xff;
282  flow_label = i & pow2_mask (20);
283 
284  if (ip_version != 6)
285  s = format (s, "\n%Uversion %d", format_white_space, indent, ip_version);
286 
287  s =
288  format (s,
289  "\n%Utos 0x%02x, flow label 0x%x, hop limit %d, payload length %d",
290  format_white_space, indent, traffic_class, flow_label,
291  ip->hop_limit, clib_net_to_host_u16 (ip->payload_length));
292 
293  /* Recurse into next protocol layer. */
294  if (max_header_bytes != 0 && sizeof (ip[0]) < max_header_bytes)
295  {
296  ip_main_t *im = &ip_main;
298 
299  if (pi && pi->format_header)
300  s = format (s, "\n%U%U",
301  format_white_space, indent - 2, pi->format_header,
302  /* next protocol header */ (void *) (ip + 1),
303  max_header_bytes - sizeof (ip[0]));
304  }
305 
306  return s;
307 }
308 
309 /* Parse an IP6 header. */
310 uword
311 unformat_ip6_header (unformat_input_t * input, va_list * args)
312 {
313  u8 **result = va_arg (*args, u8 **);
314  ip6_header_t *ip;
315  int old_length;
316 
317  /* Allocate space for IP header. */
318  {
319  void *p;
320 
321  old_length = vec_len (*result);
322  vec_add2 (*result, p, sizeof (ip[0]));
323  ip = p;
324  }
325 
326  clib_memset (ip, 0, sizeof (ip[0]));
328  clib_host_to_net_u32 (6 << 28);
329 
330  if (!unformat (input, "%U: %U -> %U",
334  return 0;
335 
336  /* Parse options. */
337  while (1)
338  {
339  int i;
340 
341  if (unformat (input, "tos %U", unformat_vlib_number, &i))
343  clib_host_to_net_u32 ((i & 0xff) << 20);
344 
345  else if (unformat (input, "hop-limit %U", unformat_vlib_number, &i))
346  ip->hop_limit = i;
347 
348  /* Can't parse input: try next protocol level. */
349  else
350  break;
351  }
352 
353  /* Recurse into next protocol layer. */
354  {
355  ip_main_t *im = &ip_main;
357 
358  if (pi && pi->unformat_header)
359  {
360  if (!unformat_user (input, pi->unformat_header, result))
361  return 0;
362 
363  /* Result may have moved. */
364  ip = (void *) *result + old_length;
365  }
366  }
367 
368  ip->payload_length =
369  clib_host_to_net_u16 (vec_len (*result) - (old_length + sizeof (ip[0])));
370 
371  return 1;
372 }
373 
374 /* Parse an IP46 address. */
375 uword
376 unformat_ip46_address (unformat_input_t * input, va_list * args)
377 {
378  ip46_address_t *ip46 = va_arg (*args, ip46_address_t *);
379  ip46_type_t type = va_arg (*args, ip46_type_t);
380  if ((type != IP46_TYPE_IP6) &&
381  unformat (input, "%U", unformat_ip4_address, &ip46->ip4))
382  {
383  ip46_address_mask_ip4 (ip46);
384  return 1;
385  }
386  else if ((type != IP46_TYPE_IP4) &&
387  unformat (input, "%U", unformat_ip6_address, &ip46->ip6))
388  {
389  return 1;
390  }
391  return 0;
392 }
393 
394 /* Format an IP46 address. */
395 u8 *
396 format_ip46_address (u8 * s, va_list * args)
397 {
398  ip46_address_t *ip46 = va_arg (*args, ip46_address_t *);
399  ip46_type_t type = va_arg (*args, ip46_type_t);
400  int is_ip4 = 1;
401 
402  switch (type)
403  {
404  case IP46_TYPE_ANY:
405  is_ip4 = ip46_address_is_ip4 (ip46);
406  break;
407  case IP46_TYPE_IP4:
408  is_ip4 = 1;
409  break;
410  case IP46_TYPE_IP6:
411  is_ip4 = 0;
412  break;
413  }
414 
415  return is_ip4 ?
416  format (s, "%U", format_ip4_address, &ip46->ip4) :
417  format (s, "%U", format_ip6_address, &ip46->ip6);
418 }
419 
420 /*
421  * fd.io coding-style-patch-verification: ON
422  *
423  * Local Variables:
424  * eval: (c-set-style "gnu")
425  * End:
426  */
format_function_t format_ip_protocol
Definition: format.h:45
unformat_function_t unformat_ip_protocol
Definition: format.h:46
a
Definition: bitmap.h:538
static uword unformat_get_input(unformat_input_t *input)
Definition: format.h:191
u64 as_u64[2]
Definition: ip6_packet.h:51
u8 * format_ip6_header(u8 *s, va_list *args)
Definition: ip6_format.c:260
#define vec_add2(V, P, N)
Add N elements to end of vector V, return pointer to new elements in P.
Definition: vec.h:560
int i
uword unformat_user(unformat_input_t *input, unformat_function_t *func,...)
Definition: unformat.c:983
static u32 format_get_indent(u8 *s)
Definition: format.h:72
clib_memset(h->entries, 0, sizeof(h->entries[0])*entries)
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
Definition: ip.h:109
vhost_vring_addr_t addr
Definition: vhost_user.h:121
ip6_address_t src_address
Definition: ip6_packet.h:385
unsigned char u8
Definition: types.h:56
uword unformat_vlib_number(unformat_input_t *input, va_list *args)
Definition: format.c:148
format_function_t format_ip4_address
Definition: format.h:75
i64 word
Definition: types.h:111
unformat_function_t unformat_ip4_address
Definition: format.h:70
static uword pow2_mask(uword x)
Definition: clib.h:220
u8 * format_white_space(u8 *s, va_list *va)
Definition: std-formats.c:113
#define ip46_address_mask_ip4(ip46)
Definition: ip6_packet.h:89
uword unformat_ip46_address(unformat_input_t *input, va_list *args)
Definition: ip6_format.c:376
unsigned int u32
Definition: types.h:88
uword unformat_ip6_header(unformat_input_t *input, va_list *args)
Definition: ip6_format.c:311
static ip_protocol_info_t * ip_get_protocol_info(ip_main_t *im, u32 protocol)
Definition: ip.h:136
ip6_address_t mask
Definition: ip6_packet.h:58
format_function_t * format_header
Definition: ip.h:81
struct _unformat_input_t unformat_input_t
unsigned short u16
Definition: types.h:57
static void unformat_put_input(unformat_input_t *input)
Definition: format.h:204
#define ip46_address_is_ip4(ip46)
Definition: ip6_packet.h:88
#define UNFORMAT_END_OF_INPUT
Definition: format.h:144
svmdb_client_t * c
ip_main_t ip_main
Definition: ip_init.c:42
uword unformat_ip6_address(unformat_input_t *input, va_list *args)
Definition: ip6_format.c:139
#define ARRAY_LEN(x)
Definition: clib.h:62
#define ASSERT(truth)
ip46_type_t
Definition: ip6_packet.h:70
u8 * format_ip6_address_and_length(u8 *s, va_list *args)
Definition: ip6_format.c:113
unformat_function_t * unformat_header
Definition: ip.h:84
u8 * format_ip6_address_and_mask(u8 *s, va_list *args)
Definition: ip6_format.c:121
u8 * format_ip6_address(u8 *s, va_list *args)
Definition: ip6_format.c:44
u32 ip_version_traffic_class_and_flow_label
Definition: ip6_packet.h:372
ip6_address_t addr
Definition: ip6_packet.h:58
u16 payload_length
Definition: ip6_packet.h:376
uword unformat_ip6_address_and_mask(unformat_input_t *input, va_list *args)
Definition: ip6_format.c:233
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
u8 * format_ip46_address(u8 *s, va_list *args)
Definition: ip6_format.c:396
u64 uword
Definition: types.h:112
u16 as_u16[8]
Definition: ip6_packet.h:49
uword unformat(unformat_input_t *i, const char *fmt,...)
Definition: unformat.c:972
ip6_address_t dst_address
Definition: ip6_packet.h:385