FD.io VPP  v19.01.3-6-g70449b9b9
Vector Packet Processing
ad.c
Go to the documentation of this file.
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  *------------------------------------------------------------------
17  * ad.c - SRv6 Dynamic Proxy (AD) function
18  *------------------------------------------------------------------
19  */
20 
21 #include <vnet/vnet.h>
22 #include <vnet/adj/adj.h>
23 #include <vnet/plugin/plugin.h>
24 #include <vpp/app/version.h>
25 #include <srv6-ad/ad.h>
26 
27 #define SID_CREATE_IFACE_FEATURE_ERROR -1
28 #define SID_CREATE_INVALID_IFACE_TYPE -3
29 #define SID_CREATE_INVALID_IFACE_INDEX -4
30 #define SID_CREATE_INVALID_ADJ_INDEX -5
31 
32 unsigned char function_name[] = "SRv6-AD-plugin";
33 unsigned char keyword_str[] = "End.AD";
34 unsigned char def_str[] =
35  "Endpoint with dynamic proxy to SR-unaware appliance";
36 unsigned char params_str[] = "nh <next-hop> oif <iface-out> iif <iface-in>";
37 
38 
39 /*****************************************/
40 /* SRv6 LocalSID instantiation and removal functions */
41 static int
43 {
44  ip6_sr_main_t *srm = &sr_main;
46  srv6_ad_localsid_t *ls_mem = localsid->plugin_mem;
47  u32 localsid_index = localsid - srm->localsids;
48 
49  /* Step 1: Prepare xconnect adjacency for sending packets to the VNF */
50 
51  /* Retrieve the adjacency corresponding to the (OIF, next_hop) */
52  adj_index_t nh_adj_index = ADJ_INDEX_INVALID;
53  if (ls_mem->inner_type != AD_TYPE_L2)
54  {
55  if (ls_mem->inner_type == AD_TYPE_IP4)
56  nh_adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
57  VNET_LINK_IP4, &ls_mem->nh_addr,
58  ls_mem->sw_if_index_out);
59  else if (ls_mem->inner_type == AD_TYPE_IP6)
60  nh_adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP6,
61  VNET_LINK_IP6, &ls_mem->nh_addr,
62  ls_mem->sw_if_index_out);
63  if (nh_adj_index == ADJ_INDEX_INVALID)
64  {
65  clib_mem_free (ls_mem);
67  }
68  }
69 
70  ls_mem->nh_adj = nh_adj_index;
71 
72 
73  /* Step 2: Prepare inbound policy for packets returning from the VNF */
74 
75  /* Sanitise the SW_IF_INDEX */
77  ls_mem->sw_if_index_in))
78  {
79  adj_unlock (ls_mem->nh_adj);
80  clib_mem_free (ls_mem);
82  }
83 
85  ls_mem->sw_if_index_in);
87  {
88  adj_unlock (ls_mem->nh_adj);
89  clib_mem_free (ls_mem);
91  }
92 
93  if (ls_mem->inner_type == AD_TYPE_L2)
94  {
95  /* Enable End.AD2 rewrite node for this interface */
96  int ret =
97  vnet_feature_enable_disable ("device-input", "srv6-ad2-rewrite",
98  ls_mem->sw_if_index_in, 1, 0, 0);
99  if (ret != 0)
100  {
101  clib_mem_free (ls_mem);
103  }
104 
105  /* Set interface in promiscuous mode */
106  vnet_main_t *vnm = vnet_get_main ();
107  ethernet_set_flags (vnm, ls_mem->sw_if_index_in,
109 
110  /* Associate local SID index to this interface (resize vector if needed) */
111  if (ls_mem->sw_if_index_in >= vec_len (sm->sw_iface_localsid2))
112  {
115  - vec_len (sm->sw_iface_localsid2)));
116  }
117  sm->sw_iface_localsid2[ls_mem->sw_if_index_in] = localsid_index;
118  }
119  else if (ls_mem->inner_type == AD_TYPE_IP4)
120  {
121  /* Enable End.AD4 rewrite node for this interface */
122  int ret =
123  vnet_feature_enable_disable ("ip4-unicast", "srv6-ad4-rewrite",
124  ls_mem->sw_if_index_in, 1, 0, 0);
125  if (ret != 0)
126  {
127  adj_unlock (ls_mem->nh_adj);
128  clib_mem_free (ls_mem);
130  }
131 
132  /* Associate local SID index to this interface (resize vector if needed) */
133  if (ls_mem->sw_if_index_in >= vec_len (sm->sw_iface_localsid4))
134  {
137  - vec_len (sm->sw_iface_localsid4)));
138  }
139  sm->sw_iface_localsid4[ls_mem->sw_if_index_in] = localsid_index;
140  }
141  else if (ls_mem->inner_type == AD_TYPE_IP6)
142  {
143  /* Enable End.AD6 rewrite node for this interface */
144  int ret =
145  vnet_feature_enable_disable ("ip6-unicast", "srv6-ad6-rewrite",
146  ls_mem->sw_if_index_in, 1, 0, 0);
147  if (ret != 0)
148  {
149  adj_unlock (ls_mem->nh_adj);
150  clib_mem_free (ls_mem);
152  }
153 
154  /* Associate local SID index to this interface (resize vector if needed) */
155  if (ls_mem->sw_if_index_in >= vec_len (sm->sw_iface_localsid6))
156  {
159  - vec_len (sm->sw_iface_localsid6)));
160  }
161  sm->sw_iface_localsid6[ls_mem->sw_if_index_in] = localsid_index;
162  }
163 
164  ls_mem->rw_len = 0;
165 
166  /* Step 3: Initialize rewrite counters */
167  srv6_ad_localsid_t **ls_p;
168  pool_get (sm->sids, ls_p);
169  *ls_p = ls_mem;
170  ls_mem->index = ls_p - sm->sids;
171 
174 
177 
178  return 0;
179 }
180 
181 static int
183 {
185  srv6_ad_localsid_t *ls_mem = localsid->plugin_mem;
186 
187  if (ls_mem->inner_type == AD_TYPE_L2)
188  {
189  /* Disable End.AD2 rewrite node for this interface */
190  int ret =
191  vnet_feature_enable_disable ("device-input", "srv6-ad2-rewrite",
192  ls_mem->sw_if_index_in, 0, 0, 0);
193  if (ret != 0)
194  return -1;
195 
196  /* Disable promiscuous mode on the interface */
197  vnet_main_t *vnm = vnet_get_main ();
198  ethernet_set_flags (vnm, ls_mem->sw_if_index_in, 0);
199 
200  /* Remove local SID index from interface table */
201  sm->sw_iface_localsid2[ls_mem->sw_if_index_in] = ~(u32) 0;
202  }
203  else if (ls_mem->inner_type == AD_TYPE_IP4)
204  {
205  /* Disable End.AD4 rewrite node for this interface */
206  int ret =
207  vnet_feature_enable_disable ("ip4-unicast", "srv6-ad4-rewrite",
208  ls_mem->sw_if_index_in, 0, 0, 0);
209  if (ret != 0)
210  return -1;
211 
212  /* Remove local SID pointer from interface table */
213  sm->sw_iface_localsid4[ls_mem->sw_if_index_in] = ~(u32) 0;
214  }
215  else if (ls_mem->inner_type == AD_TYPE_IP6)
216  {
217  /* Disable End.AD6 rewrite node for this interface */
218  int ret =
219  vnet_feature_enable_disable ("ip6-unicast", "srv6-ad6-rewrite",
220  ls_mem->sw_if_index_in, 0, 0, 0);
221  if (ret != 0)
222  return -1;
223 
224  /* Remove local SID pointer from interface table */
225  sm->sw_iface_localsid6[ls_mem->sw_if_index_in] = ~(u32) 0;
226  }
227 
228 
229  /* Unlock (OIF, NHOP) adjacency */
230  adj_unlock (ls_mem->nh_adj);
231 
232  /* Delete SID entry */
233  pool_put (sm->sids, pool_elt_at_index (sm->sids, ls_mem->index));
234 
235  /* Clean up local SID memory */
236  vec_free (ls_mem->rewrite);
237  clib_mem_free (localsid->plugin_mem);
238 
239  return 0;
240 }
241 
242 /**********************************/
243 /* SRv6 LocalSID format functions */
244 /*
245  * Prints nicely the parameters of a localsid
246  * Example: print "Table 5"
247  */
248 u8 *
249 format_srv6_ad_localsid (u8 * s, va_list * args)
250 {
251  srv6_ad_localsid_t *ls_mem = va_arg (*args, void *);
252 
253  vnet_main_t *vnm = vnet_get_main ();
255 
256  if (ls_mem->inner_type == AD_TYPE_IP4)
257  {
258  s =
259  format (s, "Next-hop:\t%U\n\t", format_ip4_address,
260  &ls_mem->nh_addr.ip4);
261  }
262  else if (ls_mem->inner_type == AD_TYPE_IP6)
263  {
264  s =
265  format (s, "Next-hop:\t%U\n\t", format_ip6_address,
266  &ls_mem->nh_addr.ip6);
267  }
268 
269  s = format (s, "Outgoing iface:\t%U\n", format_vnet_sw_if_index_name, vnm,
270  ls_mem->sw_if_index_out);
271  s = format (s, "\tIncoming iface:\t%U\n", format_vnet_sw_if_index_name, vnm,
272  ls_mem->sw_if_index_in);
273 
274  vlib_counter_t valid, invalid;
275  vlib_get_combined_counter (&(sm->valid_counters), ls_mem->index, &valid);
277  &invalid);
278  s = format (s, "\tGood rewrite traffic: \t[%Ld packets : %Ld bytes]\n",
279  valid.packets, valid.bytes);
280  s = format (s, "\tBad rewrite traffic: \t[%Ld packets : %Ld bytes]\n",
281  invalid.packets, invalid.bytes);
282 
283  return s;
284 }
285 
286 /*
287  * Process the parameters of a localsid
288  * Example: process from:
289  * sr localsid address cafe::1 behavior new_srv6_localsid 5
290  * everything from behavior on... so in this case 'new_srv6_localsid 5'
291  * Notice that it MUST match the keyword_str and params_str defined above.
292  */
293 uword
295 {
296  void **plugin_mem_p = va_arg (*args, void **);
297  srv6_ad_localsid_t *ls_mem;
298 
299  vnet_main_t *vnm = vnet_get_main ();
300 
301  u8 inner_type = AD_TYPE_L2;
302  ip46_address_t nh_addr;
303  u32 sw_if_index_out;
304  u32 sw_if_index_in;
305 
306  u8 params = 0;
307 #define PARAM_AD_NH (1 << 0)
308 #define PARAM_AD_OIF (1 << 1)
309 #define PARAM_AD_IIF (1 << 2)
310 
311  if (!unformat (input, "end.ad"))
312  return 0;
313 
315  {
316  if (!(params & PARAM_AD_NH) && unformat (input, "nh %U",
318  &nh_addr.ip4))
319  {
320  inner_type = AD_TYPE_IP4;
321  params |= PARAM_AD_NH;
322  }
323  if (!(params & PARAM_AD_NH) && unformat (input, "nh %U",
325  &nh_addr.ip6))
326  {
327  inner_type = AD_TYPE_IP6;
328  params |= PARAM_AD_NH;
329  }
330  else if (!(params & PARAM_AD_OIF) && unformat (input, "oif %U",
332  vnm, &sw_if_index_out))
333  {
334  params |= PARAM_AD_OIF;
335  }
336  else if (!(params & PARAM_AD_IIF) && unformat (input, "iif %U",
338  vnm, &sw_if_index_in))
339  {
340  params |= PARAM_AD_IIF;
341  }
342  else
343  {
344  break;
345  }
346  }
347 
348  /* Make sure that all parameters are supplied */
349  u8 params_chk = (PARAM_AD_OIF | PARAM_AD_IIF);
350  if ((params & params_chk) != params_chk)
351  {
352  return 0;
353  }
354 
355  /* Allocate and initialize memory block for local SID parameters */
356  ls_mem = clib_mem_alloc_aligned_at_offset (sizeof *ls_mem, 0, 0, 1);
357  clib_memset (ls_mem, 0, sizeof *ls_mem);
358  *plugin_mem_p = ls_mem;
359 
360  /* Set local SID parameters */
361  ls_mem->inner_type = inner_type;
362  if (inner_type == AD_TYPE_IP4)
363  ls_mem->nh_addr.ip4 = nh_addr.ip4;
364  else if (inner_type == AD_TYPE_IP6)
365  ls_mem->nh_addr.ip6 = nh_addr.ip6;
366  ls_mem->sw_if_index_out = sw_if_index_out;
367  ls_mem->sw_if_index_in = sw_if_index_in;
368 
369  return 1;
370 }
371 
372 /*************************/
373 /* SRv6 LocalSID FIB DPO */
374 static u8 *
375 format_srv6_ad_dpo (u8 * s, va_list * args)
376 {
377  index_t index = va_arg (*args, index_t);
378  CLIB_UNUSED (u32 indent) = va_arg (*args, u32);
379 
380  return (format (s, "SR: dynamic_proxy_index:[%u]", index));
381 }
382 
383 void
385 {
386 }
387 
388 void
390 {
391 }
392 
393 const static dpo_vft_t srv6_ad_vft = {
395  .dv_unlock = srv6_ad_dpo_unlock,
396  .dv_format = format_srv6_ad_dpo,
397 };
398 
399 const static char *const srv6_ad_ip6_nodes[] = {
400  "srv6-ad-localsid",
401  NULL,
402 };
403 
404 const static char *const *const srv6_ad_nodes[DPO_PROTO_NUM] = {
406 };
407 
408 /**********************/
409 static clib_error_t *
411 {
413  int rv = 0;
414 
415  sm->vlib_main = vm;
416  sm->vnet_main = vnet_get_main ();
417 
418  /* Create DPO */
420 
421  /* Register SRv6 LocalSID */
424  keyword_str,
425  def_str,
426  params_str,
427  &sm->srv6_ad_dpo_type,
432  if (rv < 0)
433  clib_error_return (0, "SRv6 LocalSID function could not be registered.");
434  else
435  sm->srv6_localsid_behavior_id = rv;
436 
437  return 0;
438 }
439 
440 /* *INDENT-OFF* */
441 VNET_FEATURE_INIT (srv6_ad2_rewrite, static) =
442 {
443  .arc_name = "device-input",
444  .node_name = "srv6-ad2-rewrite",
445  .runs_before = VNET_FEATURES ("ethernet-input"),
446 };
447 
448 VNET_FEATURE_INIT (srv6_ad4_rewrite, static) =
449 {
450  .arc_name = "ip4-unicast",
451  .node_name = "srv6-ad4-rewrite",
452  .runs_before = 0,
453 };
454 
455 VNET_FEATURE_INIT (srv6_ad6_rewrite, static) =
456 {
457  .arc_name = "ip6-unicast",
458  .node_name = "srv6-ad6-rewrite",
459  .runs_before = 0,
460 };
461 
463 
465  .version = VPP_BUILD_VER,
466  .description = "Dynamic Segment Routing for IPv6 (SRv6) Proxy",
467 };
468 /* *INDENT-ON* */
469 
470 /*
471 * fd.io coding-style-patch-verification: ON
472 *
473 * Local Variables:
474 * eval: (c-set-style "gnu")
475 * End:
476 */
ip6_sr_main_t sr_main
Definition: sr.c:31
dpo_lock_fn_t dv_lock
A reference counting lock function.
Definition: dpo.h:404
vnet_main_t * vnet_main
[convenience] vnet main
Definition: ad.h:53
#define CLIB_UNUSED(x)
Definition: clib.h:82
A virtual function table regisitered for a DPO type.
Definition: dpo.h:399
void vlib_validate_combined_counter(vlib_combined_counter_main_t *cm, u32 index)
validate a combined counter
Definition: counter.c:106
static void * clib_mem_alloc_aligned_at_offset(uword size, uword align, uword align_offset, int os_out_of_memory_on_failure)
Definition: mem.h:81
SR LocalSID.
Definition: sr.h:102
vnet_main_t * vnet_get_main(void)
Definition: misc.c:47
vnet_interface_main_t interface_main
Definition: vnet.h:56
#define NULL
Definition: clib.h:58
clib_memset(h->entries, 0, sizeof(h->entries[0]) *entries)
u32 * sw_iface_localsid4
Retrieve local SID from iface.
Definition: ad.h:60
u32 index_t
A Data-Path Object is an object that represents actions that are applied to packets are they are swit...
Definition: dpo.h:41
Combined counter to hold both packets and byte differences.
Definition: counter_types.h:26
static vnet_sw_interface_t * vnet_get_sw_interface(vnet_main_t *vnm, u32 sw_if_index)
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
unformat_function_t unformat_vnet_sw_interface
#define pool_get(P, E)
Allocate an object E from a pool P (unspecified alignment).
Definition: pool.h:236
format_function_t format_vnet_sw_if_index_name
unsigned char u8
Definition: types.h:56
#define pool_len(p)
Number of elements in pool vector.
Definition: pool.h:140
format_function_t format_ip4_address
Definition: format.h:75
u32 srv6_localsid_behavior_id
SRv6 LocalSID behavior number.
Definition: ad.h:57
unformat_function_t unformat_ip4_address
Definition: format.h:70
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:163
vlib_combined_counter_main_t invalid_counters
Invalid rewrite counters.
Definition: ad.h:66
#define AD_TYPE_IP4
Definition: ad.h:27
#define clib_error_return(e, args...)
Definition: error.h:99
void adj_unlock(adj_index_t adj_index)
Release a reference counting lock on the adjacency.
Definition: adj.c:318
#define vec_resize(V, N)
Resize a vector (no header, unspecified alignment) Add N elements to end of given vector V...
Definition: vec.h:242
unsigned int u32
Definition: types.h:88
u8 inner_type
Definition: ad.h:39
dpo_type_t dpo_register_new_type(const dpo_vft_t *vft, const char *const *const *nodes)
Create and register a new DPO type.
Definition: dpo.c:341
u32 nh_adj
Adjacency index for out.
Definition: ad.h:38
ip46_address_t nh_addr
Proxied device address.
Definition: ad.h:36
The identity of a DPO is a combination of its type and its instance number/index of objects of that t...
Definition: dpo.h:168
#define ADJ_INDEX_INVALID
Invalid ADJ index - used when no adj is known likewise blazoned capitals INVALID speak volumes where ...
Definition: adj_types.h:36
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:511
static void vlib_zero_combined_counter(vlib_combined_counter_main_t *cm, u32 index)
Clear a combined counter Clears the set of per-thread counters.
Definition: counter.h:285
counter_t packets
packet counter
Definition: counter_types.h:28
u32 sw_if_index_out
Outgoing iface to proxied dev.
Definition: ad.h:37
struct _unformat_input_t unformat_input_t
#define pool_put(P, E)
Free an object E in pool P.
Definition: pool.h:286
u32 rw_len
Number of bits to be rewritten.
Definition: ad.h:42
vlib_main_t * vlib_main
[convenience] vlib main
Definition: ad.h:52
u8 * rewrite
Headers to be rewritten.
Definition: ad.h:43
srv6_ad_localsid_t ** sids
Pool of AD SID pointers.
Definition: ad.h:63
unformat_function_t unformat_ip6_address
Definition: format.h:91
ip6_sr_localsid_t * localsids
Definition: sr.h:204
#define UNFORMAT_END_OF_INPUT
Definition: format.h:144
format_function_t format_ip6_address
Definition: format.h:93
static void vlib_get_combined_counter(const vlib_combined_counter_main_t *cm, u32 index, vlib_counter_t *result)
Get the value of a combined counter, never called in the speed path Scrapes the entire set of per-thr...
Definition: counter.h:259
vlib_main_t * vm
Definition: buffer.c:301
#define AD_TYPE_IP6
Definition: ad.h:28
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:341
#define ETHERNET_INTERFACE_FLAG_ACCEPT_ALL
Definition: ethernet.h:174
#define pool_is_free_index(P, I)
Use free bitmap to query whether given index is free.
Definition: pool.h:283
u32 adj_index_t
An index for adjacencies.
Definition: adj_types.h:30
void * plugin_mem
Memory to be used by the plugin callback functions.
Definition: sr.h:124
static void clib_mem_free(void *p)
Definition: mem.h:205
dpo_type_t srv6_ad_dpo_type
DPO type.
Definition: ad.h:55
#define VNET_FEATURES(...)
Definition: feature.h:435
u32 * sw_iface_localsid2
Retrieve local SID from iface.
Definition: ad.h:59
counter_t bytes
byte counter
Definition: counter_types.h:29
vlib_combined_counter_main_t valid_counters
Valid rewrite counters.
Definition: ad.h:65
#define DPO_PROTO_NUM
Definition: dpo.h:70
u32 * sw_iface_localsid6
Retrieve local SID from iface.
Definition: ad.h:61
u32 sw_if_index_in
Incoming iface from proxied dev.
Definition: ad.h:41
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
srv6_ad_main_t srv6_ad_main
Definition: ad.h:69
u64 uword
Definition: types.h:112
vnet_sw_interface_t * sw_interfaces
Definition: interface.h:830
Segment Routing main datastructure.
Definition: sr.h:189
vnet_sw_interface_type_t type
Definition: interface.h:704
int sr_localsid_register_function(vlib_main_t *vm, u8 *fn_name, u8 *keyword_str, u8 *def_str, u8 *params_str, dpo_type_t *dpo, format_function_t *ls_format, unformat_function_t *ls_unformat, sr_plugin_callback_t *creation_fn, sr_plugin_callback_t *removal_fn)
SR LocalSID plugin registry.
Definition: sr_localsid.c:1525
adj_index_t adj_nbr_add_or_lock(fib_protocol_t nh_proto, vnet_link_t link_type, const ip46_address_t *nh_addr, u32 sw_if_index)
Neighbour Adjacency sub-type.
Definition: adj_nbr.c:218
#define AD_TYPE_L2
Definition: ad.h:26
uword unformat(unformat_input_t *i, const char *fmt,...)
Definition: unformat.c:972
int vnet_feature_enable_disable(const char *arc_name, const char *node_name, u32 sw_if_index, int enable_disable, void *feature_config, u32 n_feature_config_bytes)
Definition: feature.c:274
static uword unformat_check_input(unformat_input_t *i)
Definition: format.h:170
u32 ethernet_set_flags(vnet_main_t *vnm, u32 hw_if_index, u32 flags)
Definition: interface.c:371