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.
17 *------------------------------------------------------------------
18 * ad-flow.c - SRv6 Flow-based Dynamic Proxy (AD.Flow) behavior
19 *------------------------------------------------------------------
22 #include <vnet/vnet.h>
23 #include <vnet/adj/adj.h>
24 #include <vnet/plugin/plugin.h>
25 #include <vpp/app/version.h>
26 #include <srv6-ad-flow/ad-flow.h>
28 #include <vppinfra/bihash_template.c>
30 #define SID_CREATE_IFACE_FEATURE_ERROR -1
31 #define SID_CREATE_INVALID_IFACE_TYPE -3
32 #define SID_CREATE_INVALID_IFACE_INDEX -4
33 #define SID_CREATE_INVALID_ADJ_INDEX -5
35 unsigned char function_name[] = "SRv6-AD-Flow-plugin";
36 unsigned char keyword_str[] = "End.AD.Flow";
37 unsigned char def_str[] =
38 "Endpoint with flow-based dynamic proxy to SR-unaware appliance";
39 unsigned char params_str[] = "nh <next-hop> oif <iface-out> iif <iface-in>";
41 srv6_ad_flow_main_t srv6_ad_flow_main;
44 ad_flow_calc_bihash_buckets (u32 n_elts)
46 return 1 << (max_log2 (n_elts >> 1) + 1);
50 ad_flow_calc_bihash_memory (u32 n_buckets, uword kv_size)
52 return n_buckets * (8 + kv_size * 4);
55 /*****************************************/
56 /* SRv6 LocalSID instantiation and removal functions */
58 srv6_ad_flow_localsid_creation_fn (ip6_sr_localsid_t *localsid)
60 ip6_sr_main_t *srm = &sr_main;
61 srv6_ad_flow_main_t *sm = &srv6_ad_flow_main;
62 srv6_ad_flow_localsid_t *ls_mem = localsid->plugin_mem;
63 u32 localsid_index = localsid - srm->localsids;
65 /* Step 1: Prepare xconnect adjacency for sending packets to the VNF */
67 /* Retrieve the adjacency corresponding to the (OIF, next_hop) */
68 adj_index_t nh_adj_index = ADJ_INDEX_INVALID;
69 if (ls_mem->inner_type == AD_TYPE_IP4)
71 adj_nbr_add_or_lock (FIB_PROTOCOL_IP4, VNET_LINK_IP4, &ls_mem->nh_addr,
72 ls_mem->sw_if_index_out);
73 else if (ls_mem->inner_type == AD_TYPE_IP6)
75 adj_nbr_add_or_lock (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &ls_mem->nh_addr,
76 ls_mem->sw_if_index_out);
78 if (nh_adj_index == ADJ_INDEX_INVALID)
80 clib_mem_free (ls_mem);
81 return SID_CREATE_INVALID_ADJ_INDEX;
84 ls_mem->nh_adj = nh_adj_index;
86 /* Step 2: Prepare inbound policy for packets returning from the VNF */
88 /* Sanitise the SW_IF_INDEX */
89 if (pool_is_free_index (sm->vnet_main->interface_main.sw_interfaces,
90 ls_mem->sw_if_index_in))
92 adj_unlock (ls_mem->nh_adj);
93 clib_mem_free (ls_mem);
94 return SID_CREATE_INVALID_IFACE_INDEX;
98 if (ls_mem->inner_type == AD_TYPE_IP4)
100 /* Enable End.AD4 rewrite node for this interface */
102 vnet_feature_enable_disable ("ip4-unicast", "srv6-ad4-flow-rewrite",
103 ls_mem->sw_if_index_in, 1, 0, 0);
106 adj_unlock (ls_mem->nh_adj);
107 clib_mem_free (ls_mem);
108 return SID_CREATE_IFACE_FEATURE_ERROR;
111 /* Associate local SID index to this interface (resize vector if needed)
113 if (ls_mem->sw_if_index_in >= vec_len (sm->sw_iface_localsid4))
115 vec_resize (sm->sw_iface_localsid4,
116 (pool_len (sm->vnet_main->interface_main.sw_interfaces) -
117 vec_len (sm->sw_iface_localsid4)));
119 sm->sw_iface_localsid4[ls_mem->sw_if_index_in] = localsid_index;
121 else if (ls_mem->inner_type == AD_TYPE_IP6)
123 /* Enable End.AD6 rewrite node for this interface */
125 vnet_feature_enable_disable ("ip6-unicast", "srv6-ad6-flow-rewrite",
126 ls_mem->sw_if_index_in, 1, 0, 0);
129 adj_unlock (ls_mem->nh_adj);
130 clib_mem_free (ls_mem);
131 return SID_CREATE_IFACE_FEATURE_ERROR;
134 /* Associate local SID index to this interface (resize vector if needed)
136 if (ls_mem->sw_if_index_in >= vec_len (sm->sw_iface_localsid6))
138 vec_resize (sm->sw_iface_localsid6,
139 (pool_len (sm->vnet_main->interface_main.sw_interfaces) -
140 vec_len (sm->sw_iface_localsid6)));
142 sm->sw_iface_localsid6[ls_mem->sw_if_index_in] = localsid_index;
145 /* Initialize flow and cache tables */
146 ls_mem->cache_size = SRV6_AD_FLOW_DEFAULT_CACHE_SIZE;
147 ls_mem->cache_buckets = ad_flow_calc_bihash_buckets (ls_mem->cache_size);
148 ls_mem->cache_memory_size = ad_flow_calc_bihash_memory (
149 ls_mem->cache_buckets, sizeof (clib_bihash_40_8_t));
151 pool_alloc (ls_mem->cache, ls_mem->cache_size);
152 pool_alloc (ls_mem->lru_pool, ls_mem->cache_size);
155 pool_get (ls_mem->lru_pool, head);
156 ls_mem->lru_head_index = head - ls_mem->lru_pool;
157 clib_dlist_init (ls_mem->lru_pool, ls_mem->lru_head_index);
159 clib_bihash_init_40_8 (&ls_mem->ftable, "ad-flow", ls_mem->cache_buckets,
160 ls_mem->cache_memory_size);
162 /* Step 3: Initialize rewrite counters */
163 srv6_ad_flow_localsid_t **ls_p;
164 pool_get (sm->sids, ls_p);
166 ls_mem->index = ls_p - sm->sids;
168 vlib_validate_combined_counter (&(sm->sid_bypass_counters), ls_mem->index);
169 vlib_validate_combined_counter (&(sm->sid_punt_counters), ls_mem->index);
170 vlib_validate_combined_counter (&(sm->sid_cache_full_counters),
172 vlib_validate_combined_counter (&(sm->rw_valid_counters), ls_mem->index);
173 vlib_validate_combined_counter (&(sm->rw_invalid_counters), ls_mem->index);
175 vlib_zero_combined_counter (&(sm->sid_bypass_counters), ls_mem->index);
176 vlib_zero_combined_counter (&(sm->sid_punt_counters), ls_mem->index);
177 vlib_zero_combined_counter (&(sm->sid_cache_full_counters), ls_mem->index);
178 vlib_zero_combined_counter (&(sm->rw_valid_counters), ls_mem->index);
179 vlib_zero_combined_counter (&(sm->rw_invalid_counters), ls_mem->index);
185 srv6_ad_flow_localsid_removal_fn (ip6_sr_localsid_t *localsid)
187 srv6_ad_flow_main_t *sm = &srv6_ad_flow_main;
188 srv6_ad_flow_localsid_t *ls_mem = localsid->plugin_mem;
190 if (ls_mem->inner_type == AD_TYPE_IP4)
192 /* Disable End.AD4 rewrite node for this interface */
194 vnet_feature_enable_disable ("ip4-unicast", "srv6-ad4-flow-rewrite",
195 ls_mem->sw_if_index_in, 0, 0, 0);
199 /* Remove local SID pointer from interface table */
200 sm->sw_iface_localsid4[ls_mem->sw_if_index_in] = ~(u32) 0;
202 else if (ls_mem->inner_type == AD_TYPE_IP6)
204 /* Disable End.AD6 rewrite node for this interface */
206 vnet_feature_enable_disable ("ip6-unicast", "srv6-ad6-flow-rewrite",
207 ls_mem->sw_if_index_in, 0, 0, 0);
211 /* Remove local SID pointer from interface table */
212 sm->sw_iface_localsid6[ls_mem->sw_if_index_in] = ~(u32) 0;
215 /* Unlock (OIF, NHOP) adjacency */
216 adj_unlock (ls_mem->nh_adj);
218 /* Delete SID entry */
219 pool_put (sm->sids, pool_elt_at_index (sm->sids, ls_mem->index));
221 /* Clean up local SID memory */
222 srv6_ad_flow_entry_t *e;
223 pool_foreach (e, ls_mem->cache)
225 vec_free (e->rw_data);
227 pool_free (ls_mem->cache);
228 pool_free (ls_mem->lru_pool);
229 clib_bihash_free_40_8 (&ls_mem->ftable);
230 clib_mem_free (localsid->plugin_mem);
235 /**********************************/
236 /* SRv6 LocalSID format functions */
238 * Prints nicely the parameters of a localsid
239 * Example: print "Table 5"
242 format_srv6_ad_flow_localsid (u8 *s, va_list *args)
244 srv6_ad_flow_localsid_t *ls_mem = va_arg (*args, void *);
246 vnet_main_t *vnm = vnet_get_main ();
247 srv6_ad_flow_main_t *sm = &srv6_ad_flow_main;
249 if (ls_mem->inner_type == AD_TYPE_IP4)
251 s = format (s, "Next-hop:\t%U\n\t", format_ip4_address,
252 &ls_mem->nh_addr.ip4);
254 else if (ls_mem->inner_type == AD_TYPE_IP6)
256 s = format (s, "Next-hop:\t%U\n\t", format_ip6_address,
257 &ls_mem->nh_addr.ip6);
260 s = format (s, "Outgoing iface:\t%U\n", format_vnet_sw_if_index_name, vnm,
261 ls_mem->sw_if_index_out);
262 s = format (s, "\tIncoming iface:\t%U\n", format_vnet_sw_if_index_name, vnm,
263 ls_mem->sw_if_index_in);
265 vlib_counter_t sid_bypass, sid_punt, sid_full, rw_valid, rw_invalid;
266 vlib_get_combined_counter (&(sm->sid_bypass_counters), ls_mem->index,
268 vlib_get_combined_counter (&(sm->sid_punt_counters), ls_mem->index,
270 vlib_get_combined_counter (&(sm->sid_cache_full_counters), ls_mem->index,
272 vlib_get_combined_counter (&(sm->rw_valid_counters), ls_mem->index,
274 vlib_get_combined_counter (&(sm->rw_invalid_counters), ls_mem->index,
278 format (s, "\tTraffic that bypassed the NF: \t[%Ld packets : %Ld bytes]\n",
279 sid_bypass.packets, sid_bypass.bytes);
280 s = format (s, "\tPunted traffic: \t[%Ld packets : %Ld bytes]\n",
281 sid_punt.packets, sid_punt.bytes);
283 format (s, "\tDropped traffic (cache full): \t[%Ld packets : %Ld bytes]\n",
284 sid_full.packets, sid_full.bytes);
285 s = format (s, "\tGood rewrite traffic: \t[%Ld packets : %Ld bytes]\n",
286 rw_valid.packets, rw_valid.bytes);
287 s = format (s, "\tBad rewrite traffic: \t[%Ld packets : %Ld bytes]\n",
288 rw_invalid.packets, rw_invalid.bytes);
294 * Process the parameters of a localsid
295 * Example: process from:
296 * sr localsid address cafe::1 behavior new_srv6_localsid 5
297 * everything from behavior on... so in this case 'new_srv6_localsid 5'
298 * Notice that it MUST match the keyword_str and params_str defined above.
301 unformat_srv6_ad_flow_localsid (unformat_input_t *input, va_list *args)
303 void **plugin_mem_p = va_arg (*args, void **);
304 srv6_ad_flow_localsid_t *ls_mem;
306 vnet_main_t *vnm = vnet_get_main ();
308 u8 inner_type = AD_TYPE_IP4;
309 ip46_address_t nh_addr;
314 #define PARAM_AD_NH (1 << 0)
315 #define PARAM_AD_OIF (1 << 1)
316 #define PARAM_AD_IIF (1 << 2)
318 if (!unformat (input, "end.ad.flow"))
321 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
323 if (!(params & PARAM_AD_NH) &&
324 unformat (input, "nh %U", unformat_ip4_address, &nh_addr.ip4))
326 inner_type = AD_TYPE_IP4;
327 params |= PARAM_AD_NH;
329 if (!(params & PARAM_AD_NH) &&
330 unformat (input, "nh %U", unformat_ip6_address, &nh_addr.ip6))
332 inner_type = AD_TYPE_IP6;
333 params |= PARAM_AD_NH;
335 else if (!(params & PARAM_AD_OIF) &&
336 unformat (input, "oif %U", unformat_vnet_sw_interface, vnm,
339 params |= PARAM_AD_OIF;
341 else if (!(params & PARAM_AD_IIF) &&
342 unformat (input, "iif %U", unformat_vnet_sw_interface, vnm,
345 params |= PARAM_AD_IIF;
353 /* Make sure that all parameters are supplied */
354 u8 params_chk = (PARAM_AD_NH | PARAM_AD_OIF | PARAM_AD_IIF);
355 if ((params & params_chk) != params_chk)
360 /* Allocate and initialize memory block for local SID parameters */
361 ls_mem = clib_mem_alloc (sizeof *ls_mem);
362 clib_memset (ls_mem, 0, sizeof *ls_mem);
363 *plugin_mem_p = ls_mem;
365 /* Set local SID parameters */
366 ls_mem->inner_type = inner_type;
367 if (inner_type == AD_TYPE_IP4)
368 ls_mem->nh_addr.ip4 = nh_addr.ip4;
369 else if (inner_type == AD_TYPE_IP6)
370 ls_mem->nh_addr.ip6 = nh_addr.ip6;
371 ls_mem->sw_if_index_out = sw_if_index_out;
372 ls_mem->sw_if_index_in = sw_if_index_in;
377 /*************************/
378 /* SRv6 LocalSID FIB DPO */
380 format_srv6_ad_flow_dpo (u8 *s, va_list *args)
382 index_t index = va_arg (*args, index_t);
383 CLIB_UNUSED (u32 indent) = va_arg (*args, u32);
385 return (format (s, "SR: dynamic_proxy_index:[%u]", index));
389 srv6_ad_flow_dpo_lock (dpo_id_t *dpo)
394 srv6_ad_flow_dpo_unlock (dpo_id_t *dpo)
398 const static dpo_vft_t srv6_ad_flow_vft = {
399 .dv_lock = srv6_ad_flow_dpo_lock,
400 .dv_unlock = srv6_ad_flow_dpo_unlock,
401 .dv_format = format_srv6_ad_flow_dpo,
404 const static char *const srv6_ad_flow_ip6_nodes[] = {
405 "srv6-ad-flow-localsid",
409 const static char *const *const srv6_ad_flow_nodes[DPO_PROTO_NUM] = {
410 [DPO_PROTO_IP6] = srv6_ad_flow_ip6_nodes,
413 /**********************/
414 static clib_error_t *
415 srv6_ad_flow_init (vlib_main_t *vm)
417 srv6_ad_flow_main_t *sm = &srv6_ad_flow_main;
421 sm->vnet_main = vnet_get_main ();
424 sm->srv6_ad_flow_dpo_type =
425 dpo_register_new_type (&srv6_ad_flow_vft, srv6_ad_flow_nodes);
427 /* Register SRv6 LocalSID */
428 rv = sr_localsid_register_function (
429 vm, function_name, keyword_str, def_str, params_str, 128,
430 &sm->srv6_ad_flow_dpo_type, format_srv6_ad_flow_localsid,
431 unformat_srv6_ad_flow_localsid, srv6_ad_flow_localsid_creation_fn,
432 srv6_ad_flow_localsid_removal_fn);
434 clib_error_return (0, "SRv6 LocalSID function could not be registered.");
436 sm->srv6_localsid_behavior_id = rv;
441 VNET_FEATURE_INIT (srv6_ad4_flow_rewrite, static) = {
442 .arc_name = "ip4-unicast",
443 .node_name = "srv6-ad4-flow-rewrite",
447 VNET_FEATURE_INIT (srv6_ad6_flow_rewrite, static) = {
448 .arc_name = "ip6-unicast",
449 .node_name = "srv6-ad6-flow-rewrite",
453 VLIB_INIT_FUNCTION (srv6_ad_flow_init);
455 VLIB_PLUGIN_REGISTER () = {
456 .version = VPP_BUILD_VER,
457 .description = "Dynamic Segment Routing for IPv6 (SRv6) Proxy",
461 * fd.io coding-style-patch-verification: ON
464 * eval: (c-set-style "gnu")