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Vector Packet Processing
sr.h
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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 /**
17  * @file
18  * @brief Segment Routing data structures definitions
19  *
20  */
21 
22 #ifndef included_vnet_srv6_h
23 #define included_vnet_srv6_h
24 
25 #include <vnet/vnet.h>
26 #include <vnet/srv6/sr_packet.h>
27 #include <vnet/ip/ip6_packet.h>
28 #include <vnet/ethernet/ethernet.h>
29 
30 #include <stdlib.h>
31 #include <string.h>
32 
33 #define IPv6_DEFAULT_HEADER_LENGTH 40
34 #define IPv6_DEFAULT_HOP_LIMIT 64
35 #define IPv6_DEFAULT_MAX_MASK_WIDTH 128
36 
37 #define SR_BEHAVIOR_END 1
38 #define SR_BEHAVIOR_X 2
39 #define SR_BEHAVIOR_T 3
40 #define SR_BEHAVIOR_D_FIRST 4 /* Unused. Separator in between regular and D */
41 #define SR_BEHAVIOR_DX2 5
42 #define SR_BEHAVIOR_DX6 6
43 #define SR_BEHAVIOR_DX4 7
44 #define SR_BEHAVIOR_DT6 8
45 #define SR_BEHAVIOR_DT4 9
46 #define SR_BEHAVIOR_END_UN_PERF 10
47 #define SR_BEHAVIOR_END_UN 11
48 #define SR_BEHAVIOR_LAST 12 /* Must always be the last one */
49 
50 #define SR_STEER_L2 2
51 #define SR_STEER_IPV4 4
52 #define SR_STEER_IPV6 6
53 
54 #define SR_FUNCTION_SIZE 4
55 #define SR_ARGUMENT_SIZE 4
56 
57 #define SR_SEGMENT_LIST_WEIGHT_DEFAULT 1
58 
59 /* *INDENT-OFF* */
60 typedef struct
61 {
64 } __attribute__ ((packed)) ip6srv_combo_header_t;
65 /* *INDENT-ON* */
66 
67 /**
68  * @brief SR Segment List (SID list)
69  */
70 typedef struct
71 {
72  ip6_address_t *segments; /**< SIDs (key) */
73 
74  u32 weight; /**< SID list weight (wECMP / UCMP) */
75 
76  u8 *rewrite; /**< Precomputed rewrite header */
77  u8 *rewrite_bsid; /**< Precomputed rewrite header for bindingSID */
78 
79  dpo_id_t bsid_dpo; /**< DPO for Encaps/Insert for BSID */
80  dpo_id_t ip6_dpo; /**< DPO for Encaps/Insert IPv6 */
81  dpo_id_t ip4_dpo; /**< DPO for Encaps IPv6 */
82 
84  void *plugin_mem;
85 } ip6_sr_sl_t;
86 
87 /* SR policy types */
88 #define SR_POLICY_TYPE_DEFAULT 0
89 #define SR_POLICY_TYPE_SPRAY 1
90 /**
91  * @brief SR Policy
92  */
93 typedef struct
94 {
95  u32 *segments_lists; /**< SID lists indexes (vector) */
96 
97  ip6_address_t bsid; /**< BindingSID (key) */
98 
99  u8 type; /**< Type (default is 0) */
100  /* SR Policy specific DPO */
101  /* IF Type = DEFAULT Then Load Balancer DPO among SID lists */
102  /* IF Type = SPRAY then Spray DPO with all SID lists */
103  dpo_id_t bsid_dpo; /**< SR Policy specific DPO - BSID */
104  dpo_id_t ip4_dpo; /**< SR Policy specific DPO - IPv6 */
105  dpo_id_t ip6_dpo; /**< SR Policy specific DPO - IPv4 */
106 
107  u32 fib_table; /**< FIB table */
108 
109  u8 is_encap; /**< Mode (0 is SRH insert, 1 Encaps) */
110 
112  void *plugin_mem;
114 
116 
117 /**
118  * @brief SR LocalSID
119  */
120 typedef struct
121 {
122  ip6_address_t localsid; /**< LocalSID IPv6 address */
123 
125 
126  char end_psp; /**< Combined with End.PSP? */
127 
128  u16 behavior; /**< Behavior associated to this localsid */
129 
130  union
131  {
132  u32 sw_if_index; /**< xconnect only */
133  u32 vrf_index; /**< vrf only */
134  };
135 
136  u32 fib_table; /**< FIB table where localsid is registered */
137 
138  u32 vlan_index; /**< VLAN tag (not an index) */
139 
140  ip46_address_t next_hop; /**< Next_hop for xconnect usage only */
141 
142  u32 nh_adj; /**< Next_adj for xconnect usage only */
143 
144  ip6_address_t usid_block;
145  ip6_address_t usid_block_mask;
146 
149 
152 
153  void *plugin_mem; /**< Memory to be used by the plugin callback functions */
155 
156 typedef int (sr_plugin_callback_t) (ip6_sr_localsid_t * localsid);
157 
158 /**
159  * @brief SR LocalSID behavior registration
160  */
161 typedef struct
162 {
163  u16 sr_localsid_function_number; /**< SR LocalSID plugin function (>SR_BEHAVIOR_LAST) */
164 
165  u8 *function_name; /**< Function name. (key). */
166 
167  u8 *keyword_str; /**< Behavior keyword (i.e. End.X) */
168 
169  u8 *def_str; /**< Behavior definition (i.e. Endpoint with cross-connect) */
170 
171  u8 *params_str; /**< Behavior parameters (i.e. <oif> <IP46next_hop>) */
172 
174 
175  dpo_type_t dpo; /**< DPO type registration */
176 
177  format_function_t *ls_format; /**< LocalSID format function */
178 
179  unformat_function_t *ls_unformat; /**< LocalSID unformat function */
180 
181  sr_plugin_callback_t *creation; /**< Function within plugin that will be called after localsid creation*/
182 
183  sr_plugin_callback_t *removal; /**< Function within plugin that will be called before localsid removal */
185 
186 /**
187  * @brief SR Policy behavior registration
188  */
189 typedef struct
190 {
191  u16 sr_policy_function_number; /**< SR Policy plugin function */
192 
193  u8 *function_name; /**< Function name. (key). */
194 
195  u8 *keyword_str; /**< Behavior keyword (i.e. End.X) */
196 
197  u8 *def_str; /**< Behavior definition (i.e. Endpoint with cross-connect) */
198 
199  u8 *params_str; /**< Behavior parameters (i.e. <oif> <IP46next_hop>) */
200 
202 
203  dpo_type_t dpo; /**< DPO type registration */
204 
205  format_function_t *ls_format; /**< LocalSID format function */
206 
207  unformat_function_t *ls_unformat; /**< LocalSID unformat function */
208 
209  sr_p_plugin_callback_t *creation; /**< Function within plugin that will be called after localsid creation*/
210 
211  sr_p_plugin_callback_t *removal; /**< Function within plugin that will be called before localsid removal */
213 
214 /**
215  * @brief Steering db key
216  *
217  * L3 is IPv4/IPv6 + mask
218  * L2 is sf_if_index + vlan
219  */
220 typedef struct
221 {
222  union
223  {
224  struct
225  {
226  ip46_address_t prefix; /**< IP address of the prefix */
227  u32 mask_width; /**< Mask width of the prefix */
228  u32 fib_table; /**< VRF of the prefix */
229  } l3;
230  struct
231  {
232  u32 sw_if_index; /**< Incoming software interface */
233  } l2;
234  };
235  u8 traffic_type; /**< Traffic type (IPv4, IPv6, L2) */
238 
239 typedef struct
240 {
241  sr_steering_key_t classify; /**< Traffic classification */
242  u32 sr_policy; /**< SR Policy index */
244 
245 typedef struct
246 {
247  ip6_address_t address;
251 
252 /**
253  * @brief Segment Routing main datastructure
254  */
255 typedef struct
256 {
257  /* L2-input -> SR rewrite next index */
259 
260  /* SR SID lists */
262 
263  /* SRv6 policies */
265 
266  /* Hash table mapping BindingSID to SRv6 policy */
268 
269  /* Pool of SR localsid instances */
271 
272  /* Hash table mapping LOC:FUNC to SR LocalSID instance */
274 
275  /* Pool of SR steer policies instances */
277 
278  /* Hash table mapping steering rules to SR steer instance */
280 
281  /* L2 steering ifaces - sr_policies */
283 
284  /* Spray DPO */
286 
287  /* Plugin functions */
289 
290  /* Find plugin function by name */
292 
293  /* Plugin functions for Policy */
295 
296  /* Find plugin function by name */
298 
299  /* Counters */
302 
303  /* SR Policies FIBs */
306 
307  /* convenience */
310 } ip6_sr_main_t;
311 
312 extern ip6_sr_main_t sr_main;
313 
318 
319 extern void sr_dpo_lock (dpo_id_t * dpo);
320 extern void sr_dpo_unlock (dpo_id_t * dpo);
321 
322 extern int
324  u8 * keyword_str, u8 * def_str,
325  u8 * params_str, u8 prefix_length,
326  dpo_type_t * dpo,
327  format_function_t * ls_format,
328  unformat_function_t * ls_unformat,
329  sr_plugin_callback_t * creation_fn,
330  sr_plugin_callback_t * removal_fn);
331 
332 extern int
334  u8 * keyword_str, u8 * def_str,
335  u8 * params_str, u8 prefix_length,
336  dpo_type_t * dpo,
337  format_function_t * ls_format,
338  unformat_function_t * ls_unformat,
339  sr_p_plugin_callback_t * creation_fn,
340  sr_p_plugin_callback_t * removal_fn);
341 
342 extern int
343 sr_policy_add (ip6_address_t * bsid, ip6_address_t * segments,
344  u32 weight, u8 behavior, u32 fib_table, u8 is_encap,
345  u16 plugin, void *plugin_mem);
346 extern int sr_policy_mod (ip6_address_t * bsid, u32 index, u32 fib_table,
347  u8 operation, ip6_address_t * segments,
348  u32 sl_index, u32 weight);
349 extern int sr_policy_del (ip6_address_t * bsid, u32 index);
350 
351 extern int
352 sr_cli_localsid (char is_del, ip6_address_t * localsid_addr,
353  u16 localsid_prefix_len, char end_psp, u8 behavior,
354  u32 sw_if_index, u32 vlan_index, u32 fib_table,
355  ip46_address_t * nh_addr, int usid_len, void *ls_plugin_mem);
356 
357 extern int
358 sr_steering_policy (int is_del, ip6_address_t * bsid, u32 sr_policy_index,
359  u32 table_id, ip46_address_t * prefix, u32 mask_width,
360  u32 sw_if_index, u8 traffic_type);
361 
362 extern void sr_set_source (ip6_address_t * address);
363 
364 extern void sr_set_hop_limit (u8 hop_limit);
365 extern u8 sr_get_hop_limit (void);
366 
367 /**
368  * @brief SR rewrite string computation for SRH insertion (inline)
369  *
370  * @param sl is a vector of IPv6 addresses composing the Segment List
371  *
372  * @return precomputed rewrite string for SRH insertion
373  */
374 static inline u8 *
376 {
377  ip6_sr_header_t *srh;
378  ip6_address_t *addrp, *this_address;
379  u32 header_length = 0;
380  u8 *rs = NULL;
381 
382  header_length = 0;
383  header_length += sizeof (ip6_sr_header_t);
384  header_length += (vec_len (sl) + 1) * sizeof (ip6_address_t);
385 
386  vec_validate (rs, header_length - 1);
387 
388  srh = (ip6_sr_header_t *) rs;
390  srh->segments_left = vec_len (sl);
391  srh->last_entry = vec_len (sl);
392  srh->length = ((sizeof (ip6_sr_header_t) +
393  ((vec_len (sl) + 1) * sizeof (ip6_address_t))) / 8) - 1;
394  srh->flags = 0x00;
395  srh->tag = 0x0000;
396  addrp = srh->segments + vec_len (sl);
397  vec_foreach (this_address, sl)
398  {
399  clib_memcpy_fast (addrp->as_u8, this_address->as_u8,
400  sizeof (ip6_address_t));
401  addrp--;
402  }
403  return rs;
404 }
405 
406 
407 #endif /* included_vnet_sr_h */
408 
409 /*
410  * fd.io coding-style-patch-verification: ON
411  *
412  * Local Variables:
413  * eval: (c-set-style "gnu")
414  * End:
415  */
u8 * params_str
Behavior parameters (i.e.
Definition: sr.h:199
u8 * function_name
Function name.
Definition: sr.h:165
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment) ...
Definition: vec.h:507
u32 sw_if_index
Incoming software interface.
Definition: sr.h:232
u8 type
Type (default is 0)
Definition: sr.h:99
Definition: mhash.h:46
u32 vlan_index
VLAN tag (not an index)
Definition: sr.h:138
vlib_node_registration_t sr_policy_rewrite_encaps_node
(constructor) VLIB_REGISTER_NODE (sr_policy_rewrite_encaps_node)
u32 nh_adj
Next_adj for xconnect usage only.
Definition: sr.h:142
void sr_set_source(ip6_address_t *address)
uword * policy_plugin_functions_by_key
Definition: sr.h:297
u32 mask_width
Mask width of the prefix.
Definition: sr.h:227
SR LocalSID.
Definition: sr.h:120
u32 fib_table
FIB table.
Definition: sr.h:107
u8 sr_get_hop_limit(void)
format_function_t * ls_format
LocalSID format function.
Definition: sr.h:205
sr_p_plugin_callback_t * removal
Function within plugin that will be called before localsid removal.
Definition: sr.h:211
Optimized string handling code, including c11-compliant "safe C library" variants.
int sr_steering_policy(int is_del, ip6_address_t *bsid, u32 sr_policy_index, u32 table_id, ip46_address_t *prefix, u32 mask_width, u32 sw_if_index, u8 traffic_type)
Steer traffic L2 and L3 traffic through a given SR policy.
Definition: sr_steering.c:60
#define clib_memcpy_fast(a, b, c)
Definition: string.h:81
unsigned char params_str[32]
format_function_t * ls_format
LocalSID format function.
Definition: sr.h:177
dpo_id_t ip4_dpo
DPO for Encaps IPv6.
Definition: sr.h:81
ip6_address_t * segments
SIDs (key)
Definition: sr.h:72
u8 usid_next_index
Definition: sr.h:150
dpo_type_t dpo
DPO type registration.
Definition: sr.h:203
u32 l2_sr_policy_rewrite_index
Definition: sr.h:258
u16 behavior
Behavior associated to this localsid.
Definition: sr.h:128
#define ROUTING_HEADER_TYPE_SR
Definition: sr_packet.h:117
u16 localsid_prefix_len
Definition: sr.h:124
unsigned char keyword_str[32]
vl_api_prefix_t prefix
Definition: ip.api:144
vlib_combined_counter_main_t sr_ls_invalid_counters
Definition: sr.h:301
vlib_combined_counter_main_t sr_ls_valid_counters
Definition: sr.h:300
ip6_sr_steering_policy_t * steer_policies
Definition: sr.h:276
int sr_localsid_register_function(vlib_main_t *vm, u8 *fn_name, u8 *keyword_str, u8 *def_str, u8 *params_str, u8 prefix_length, 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:2347
unsigned char u8
Definition: types.h:56
u8 * rewrite_bsid
Precomputed rewrite header for bindingSID.
Definition: sr.h:77
u16 sr_policy_function_number
SR Policy plugin function.
Definition: sr.h:191
dpo_id_t ip6_dpo
DPO for Encaps/Insert IPv6.
Definition: sr.h:80
u32 * sw_iface_sr_policies
Definition: sr.h:282
u8 *() format_function_t(u8 *s, va_list *args)
Definition: format.h:48
enum dpo_type_t_ dpo_type_t
Common types of data-path objects New types can be dynamically added using dpo_register_new_type() ...
vl_api_interface_index_t sw_if_index
Definition: gre.api:53
sr_policy_fn_registration_t * policy_plugin_functions
Definition: sr.h:294
SR Segment List (SID list)
Definition: sr.h:70
ip6_address_t address
Definition: sr.h:247
sr_p_plugin_callback_t * creation
Function within plugin that will be called after localsid creation.
Definition: sr.h:209
unsigned int u32
Definition: types.h:88
u32 padding
Definition: vhost_user.h:151
SR Policy behavior registration.
Definition: sr.h:189
vlib_node_registration_t sr_localsid_node
(constructor) VLIB_REGISTER_NODE (sr_localsid_node)
Definition: sr_localsid.c:1752
The identity of a DPO is a combination of its type and its instance number/index of objects of that t...
Definition: dpo.h:170
ip6_sr_header_t sr
Definition: sr.h:63
vlib_main_t * vlib_main
Definition: sr.h:308
vl_api_address_t nh_addr
Definition: lisp_gpe.api:222
unsigned short u16
Definition: types.h:57
ip6_header_t ip
Definition: sr.h:62
SR LocalSID behavior registration.
Definition: sr.h:161
unsigned char def_str[64]
int sr_cli_localsid(char is_del, ip6_address_t *localsid_addr, u16 localsid_prefix_len, char end_psp, u8 behavior, u32 sw_if_index, u32 vlan_index, u32 fib_table, ip46_address_t *nh_addr, int usid_len, void *ls_plugin_mem)
SR localsid add/del.
Definition: sr_localsid.c:77
char end_psp
Combined with End.PSP?
Definition: sr.h:126
u8 weight
Definition: fib_types.api:120
sr_steering_key_t classify
Traffic classification.
Definition: sr.h:241
void * plugin_mem
Definition: sr.h:84
ip6_address_t usid_block_mask
Definition: sr.h:145
uword() unformat_function_t(unformat_input_t *input, va_list *args)
Definition: format.h:233
u8 is_encap
Mode (0 is SRH insert, 1 Encaps)
Definition: sr.h:109
vlib_main_t * vm
Definition: in2out_ed.c:1599
u32 sr_policy
SR Policy index.
Definition: sr.h:242
u32 weight
SID list weight (wECMP / UCMP)
Definition: sr.h:74
unformat_function_t * ls_unformat
LocalSID unformat function.
Definition: sr.h:207
static u8 fn_name[]
Definition: gtp4_d.c:66
ip6_sr_localsid_t * localsids
Definition: sr.h:270
vnet_main_t * vnet_main
Definition: sr.h:309
u16 plugin
Definition: sr.h:111
u8 usid_index
Definition: sr.h:147
ip6_address_t usid_block
Definition: sr.h:144
int() sr_plugin_callback_t(ip6_sr_localsid_t *localsid)
Definition: sr.h:156
u8 mask_width
Definition: dhcp.api:204
int sr_policy_del(ip6_address_t *bsid, u32 index)
Delete a SR policy.
u32 * segments_lists
SID lists indexes (vector)
Definition: sr.h:95
unformat_function_t * ls_unformat
LocalSID unformat function.
Definition: sr.h:179
void sr_dpo_lock(dpo_id_t *dpo)
no-op lock function.
Definition: sr.c:38
dpo_id_t bsid_dpo
DPO for Encaps/Insert for BSID.
Definition: sr.h:79
dpo_type_t sr_pr_spray_dpo_type
Definition: sr.h:285
u8 * function_name
Function name.
Definition: sr.h:193
Steering db key.
Definition: sr.h:220
u8 * def_str
Behavior definition (i.e.
Definition: sr.h:197
dpo_type_t dpo
DPO type registration.
Definition: sr.h:175
manual_print typedef address
Definition: ip_types.api:85
u8 * def_str
Behavior definition (i.e.
Definition: sr.h:169
void * plugin_mem
Memory to be used by the plugin callback functions.
Definition: sr.h:153
void sr_dpo_unlock(dpo_id_t *dpo)
no-op unlock function.
Definition: sr.c:47
u32 vrf_index
vrf only
Definition: sr.h:133
int sr_policy_add(ip6_address_t *bsid, ip6_address_t *segments, u32 weight, u8 behavior, u32 fib_table, u8 is_encap, u16 plugin, void *plugin_mem)
Create a new SR policy.
u16 plugin
Definition: sr.h:83
vlib_node_registration_t sr_localsid_d_node
(constructor) VLIB_REGISTER_NODE (sr_localsid_d_node)
Definition: sr_localsid.c:1442
int sr_policy_register_function(vlib_main_t *vm, u8 *fn_name, u8 *keyword_str, u8 *def_str, u8 *params_str, u8 prefix_length, dpo_type_t *dpo, format_function_t *ls_format, unformat_function_t *ls_unformat, sr_p_plugin_callback_t *creation_fn, sr_p_plugin_callback_t *removal_fn)
SR Policy plugin registry.
u16 pref_len
Definition: sr.h:248
u32 fib_table
FIB table where localsid is registered.
Definition: sr.h:136
mhash_t sr_policies_index_hash
Definition: sr.h:267
u16 sr_localsid_function_number
SR LocalSID plugin function (>SR_BEHAVIOR_LAST)
Definition: sr.h:163
struct _vlib_node_registration vlib_node_registration_t
u8 usid_next_len
Definition: sr.h:151
vlib_node_registration_t sr_policy_rewrite_insert_node
(constructor) VLIB_REGISTER_NODE (sr_policy_rewrite_insert_node)
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
ip6_sr_policy_t * sr_policies
Definition: sr.h:264
mhash_t sr_steer_policies_hash
Definition: sr.h:279
ip6_address_t segments[0]
Definition: sr_packet.h:149
SR Policy.
Definition: sr.h:93
sr_plugin_callback_t * creation
Function within plugin that will be called after localsid creation.
Definition: sr.h:181
u8 * rewrite
Precomputed rewrite header.
Definition: sr.h:76
u64 uword
Definition: types.h:112
int() sr_p_plugin_callback_t(ip6_sr_policy_t *sr)
Definition: sr.h:115
dpo_id_t bsid_dpo
SR Policy specific DPO - BSID.
Definition: sr.h:103
A collection of combined counters.
Definition: counter.h:188
ip6_sr_sl_t * sid_lists
Definition: sr.h:261
void sr_set_hop_limit(u8 hop_limit)
Segment Routing main datastructure.
Definition: sr.h:255
dpo_id_t ip6_dpo
SR Policy specific DPO - IPv4.
Definition: sr.h:105
u32 fib_table
VRF of the prefix.
Definition: sr.h:228
ip46_address_t prefix
IP address of the prefix.
Definition: sr.h:226
#define vec_foreach(var, vec)
Vector iterator.
u8 traffic_type
Traffic type (IPv4, IPv6, L2)
Definition: sr.h:235
u32 fib_table_ip4
Definition: sr.h:305
ip46_address_t next_hop
Next_hop for xconnect usage only.
Definition: sr.h:140
mhash_t sr_localsids_index_hash
Definition: sr.h:273
u8 * params_str
Behavior parameters (i.e.
Definition: sr.h:171
u32 table_id
Definition: fib_types.api:118
u32 sw_if_index
xconnect only
Definition: sr.h:132
sr_plugin_callback_t * removal
Function within plugin that will be called before localsid removal.
Definition: sr.h:183
void * plugin_mem
Definition: sr.h:112
dpo_id_t ip4_dpo
SR Policy specific DPO - IPv6.
Definition: sr.h:104
ip6_address_t localsid
LocalSID IPv6 address.
Definition: sr.h:122
u32 fib_table_ip6
Definition: sr.h:304
u8 * keyword_str
Behavior keyword (i.e.
Definition: sr.h:167
ip6_sr_main_t sr_main
Definition: sr.c:31
sr_localsid_fn_registration_t * plugin_functions
Definition: sr.h:288
int sr_policy_mod(ip6_address_t *bsid, u32 index, u32 fib_table, u8 operation, ip6_address_t *segments, u32 sl_index, u32 weight)
Modify an existing SR policy.
ip6_address_t bsid
BindingSID (key)
Definition: sr.h:97
uword * plugin_functions_by_key
Definition: sr.h:291
u8 * keyword_str
Behavior keyword (i.e.
Definition: sr.h:195
static u8 * ip6_sr_compute_rewrite_string_insert(ip6_address_t *sl)
SR rewrite string computation for SRH insertion (inline)
Definition: sr.h:375