FD.io VPP  v20.09-64-g4f7b92f0a
Vector Packet Processing
ip_interface.c
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1 /*
2  * Copyright (c) 2020 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 #include <vnet/ip/ip.h>
17 
18 /**
19  * @file
20  * @brief IP prefix management on interfaces
21  */
22 
23 u32
25  void *addr_fib, u32 address_length)
26 {
27  uword *p = mhash_get (&lm->address_to_if_address_index, addr_fib);
28 
29  if (p)
30  return (p[0]);
31 
32  return (~0);
33 }
34 
38  void *addr_fib,
39  u32 address_length, u32 * result_if_address_index)
40 {
41  vnet_main_t *vnm = vnet_get_main ();
42  ip_interface_address_t *a, *prev;
43  u32 pi; /* previous index */
44  u32 ai;
45  u32 hi; /* head index */
46 
47  /* Verify given length. */
48  if ((address_length == 0) ||
49  (lm->is_ip6 && address_length > 128) ||
50  (!lm->is_ip6 && address_length > 32))
51  {
52  vnm->api_errno = VNET_API_ERROR_ADDRESS_LENGTH_MISMATCH;
53  return clib_error_create
54  ("%U wrong length for interface %U",
55  lm->format_address_and_length, addr_fib,
56  address_length, format_vnet_sw_if_index_name, vnm, sw_if_index);
57  }
58 
60  sw_if_index, ~0);
61 
63 
64  ai = a - lm->if_address_pool;
66 
67  prev = 0;
68  while (pi != (u32) ~ 0)
69  {
70  prev = pool_elt_at_index (lm->if_address_pool, pi);
71  pi = prev->next_this_sw_interface;
72  }
73  pi = prev ? prev - lm->if_address_pool : (u32) ~ 0;
74 
76  addr_fib, ai, /* old_value */ 0);
77  a->address_length = address_length;
79  a->flags = 0;
80  a->prev_this_sw_interface = pi;
81  a->next_this_sw_interface = ~0;
82  if (prev)
83  prev->next_this_sw_interface = ai;
84 
86  (hi != ~0) ? hi : ai;
87 
88  *result_if_address_index = ai;
89 
90  return (NULL);
91 }
92 
95  vnet_main_t * vnm,
96  u32 address_index, void *addr_fib,
97  u32 address_length, u32 sw_if_index)
98 {
99  ip_interface_address_t *a, *prev, *next;
100 
101  a = pool_elt_at_index (lm->if_address_pool, address_index);
102 
103  if (a->sw_if_index != sw_if_index)
104  {
105  vnm->api_errno = VNET_API_ERROR_ADDRESS_NOT_FOUND_FOR_INTERFACE;
106  return clib_error_create ("%U not found for interface %U",
108  addr_fib, address_length,
110  vnet_get_main (), sw_if_index);
111  }
112 
113  if (a->prev_this_sw_interface != ~0)
114  {
118  }
119  if (a->next_this_sw_interface != ~0)
120  {
124 
125  if (a->prev_this_sw_interface == ~0)
128  }
129 
130  if ((a->next_this_sw_interface == ~0) && (a->prev_this_sw_interface == ~0))
132 
134  /* old_value */ 0);
135  pool_put (lm->if_address_pool, a);
136  return NULL;
137 }
138 
139 u8
140 ip_interface_has_address (u32 sw_if_index, ip46_address_t * ip, u8 is_ip4)
141 {
142  ip_interface_address_t *ia = 0;
143 
144  if (is_ip4)
145  {
148  /* *INDENT-OFF* */
149  foreach_ip_interface_address (lm4, ia, sw_if_index, 1 /* unnumbered */ ,
150  ({
151  ip4 = ip_interface_address_get_address (lm4, ia);
152  if (ip4_address_compare (ip4, &ip->ip4) == 0)
153  return 1;
154  }));
155  /* *INDENT-ON* */
156  }
157  else
158  {
160  ip6_address_t *ip6;
161  /* *INDENT-OFF* */
162  foreach_ip_interface_address (lm6, ia, sw_if_index, 1 /* unnumbered */ ,
163  ({
164  ip6 = ip_interface_address_get_address (lm6, ia);
165  if (ip6_address_compare (ip6, &ip->ip6) == 0)
166  return 1;
167  }));
168  /* *INDENT-ON* */
169  }
170  return 0;
171 }
172 
173 void *
175 {
178  ip_interface_address_t *ia = 0;
179 
180  if (is_ip4)
181  {
182  /* *INDENT-OFF* */
183  foreach_ip_interface_address (lm4, ia, sw_if_index, 1 /* unnumbered */ ,
184  ({
185  return ip_interface_address_get_address (lm4, ia);
186  }));
187  /* *INDENT-ON* */
188  }
189  else
190  {
191  /* *INDENT-OFF* */
192  foreach_ip_interface_address (lm6, ia, sw_if_index, 1 /* unnumbered */ ,
193  ({
194  ip6_address_t *rv;
195  rv = ip_interface_address_get_address (lm6, ia);
196  /* Trying to use a link-local ip6 src address is a fool's errand */
198  return rv;
199  }));
200  /* *INDENT-ON* */
201  }
202 
203  return 0;
204 }
205 
206 static walk_rc_t
208  vnet_sw_interface_t * si, void *ctx)
209 {
212  ip_interface_address_t *ia = 0;
213 
214  /* *INDENT-OFF* */
215  foreach_ip_interface_address (lm4, ia, si->sw_if_index, 1 /* unnumbered */ ,
216  ({
217  ia->flags |= IP_INTERFACE_ADDRESS_FLAG_STALE;
218  }));
219  foreach_ip_interface_address (lm6, ia, si->sw_if_index, 1 /* unnumbered */ ,
220  ({
221  ia->flags |= IP_INTERFACE_ADDRESS_FLAG_STALE;
222  }));
223  /* *INDENT-ON* */
224 
225  return (WALK_CONTINUE);
226 }
227 
228 void
230 {
233 }
234 
235 static walk_rc_t
237  vnet_sw_interface_t * si, void *ctx)
238 {
240  ip4_address_t *ip4_addrs = 0;
241  ip6_address_t *ip6_addrs = 0;
242  ip4_main_t *im4 = &ip4_main;
243  ip6_main_t *im6 = &ip6_main;
245  u32 *ip6_masks = 0;
246  u32 *ip4_masks = 0;
247  int i;
248 
249  /* *INDENT-OFF* */
251  ({
252  if (ia->flags & IP_INTERFACE_ADDRESS_FLAG_STALE)
253  {
254  ip4_address_t * x = (ip4_address_t *)
255  ip_interface_address_get_address (&im4->lookup_main, ia);
256  vec_add1 (ip4_addrs, x[0]);
257  vec_add1 (ip4_masks, ia->address_length);
258  }
259  }));
260 
261  foreach_ip_interface_address (&im6->lookup_main, ia, si->sw_if_index, 1,
262  ({
263  if (ia->flags & IP_INTERFACE_ADDRESS_FLAG_STALE)
264  {
265  ip6_address_t * x = (ip6_address_t *)
266  ip_interface_address_get_address (&im6->lookup_main, ia);
267  vec_add1 (ip6_addrs, x[0]);
268  vec_add1 (ip6_masks, ia->address_length);
269  }
270  }));
271  /* *INDENT-ON* */
272 
273  for (i = 0; i < vec_len (ip4_addrs); i++)
274  ip4_add_del_interface_address (vm, si->sw_if_index, &ip4_addrs[i],
275  ip4_masks[i], 1 /* is_del */ );
276  for (i = 0; i < vec_len (ip6_addrs); i++)
277  ip6_add_del_interface_address (vm, si->sw_if_index, &ip6_addrs[i],
278  ip6_masks[i], 1 /* is_del */ );
279 
280  vec_free (ip4_addrs);
281  vec_free (ip4_masks);
282  vec_free (ip6_addrs);
283  vec_free (ip6_masks);
284 
285  return (WALK_CONTINUE);
286 }
287 
288 void
290 {
293 }
294 
295 /*
296  * fd.io coding-style-patch-verification: ON
297  *
298  * Local Variables:
299  * eval: (c-set-style "gnu")
300  * End:
301  */
u8 ip_interface_has_address(u32 sw_if_index, ip46_address_t *ip, u8 is_ip4)
Definition: ip_interface.c:140
a
Definition: bitmap.h:538
ip_interface_address_t * if_address_pool
Pool of addresses that are assigned to interfaces.
Definition: lookup.h:148
vnet_main_t * vnet_get_main(void)
Definition: misc.c:46
#define pool_get_zero(P, E)
Allocate an object E from a pool P and zero it.
Definition: pool.h:255
void ip_interface_address_mark(void)
Definition: ip_interface.c:229
void * ip_interface_get_first_ip(u32 sw_if_index, u8 is_ip4)
Definition: ip_interface.c:174
static void * ip_interface_address_get_address(ip_lookup_main_t *lm, ip_interface_address_t *a)
Definition: ip_interface.h:43
uword mhash_unset(mhash_t *h, void *key, uword *old_value)
Definition: mhash.c:346
ip_lookup_main_t lookup_main
Definition: ip4.h:108
vlib_main_t * vm
Definition: in2out_ed.c:1582
mhash_t address_to_if_address_index
Hash table mapping address to index in interface address pool.
Definition: lookup.h:151
format_function_t format_vnet_sw_if_index_name
unsigned char u8
Definition: types.h:56
enum walk_rc_t_ walk_rc_t
Walk return code.
vl_api_ip6_address_t ip6
Definition: one.api:424
unsigned int u32
Definition: types.h:88
#define clib_error_create(args...)
Definition: error.h:96
clib_error_t * ip4_add_del_interface_address(vlib_main_t *vm, u32 sw_if_index, ip4_address_t *address, u32 address_length, u32 is_del)
Definition: ip4_forward.c:872
vnet_api_error_t api_errno
Definition: vnet.h:84
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:534
static walk_rc_t ip_interface_address_mark_one_interface(vnet_main_t *vnm, vnet_sw_interface_t *si, void *ctx)
Definition: ip_interface.c:207
void vnet_sw_interface_walk(vnet_main_t *vnm, vnet_sw_interface_walk_t fn, void *ctx)
Walk all the SW interfaces in the system.
Definition: interface.c:1094
long ctx[MAX_CONNS]
Definition: main.c:144
#define pool_put(P, E)
Free an object E in pool P.
Definition: pool.h:302
int ip6_address_compare(ip6_address_t *a1, ip6_address_t *a2)
Definition: ip46_cli.c:60
vl_api_ip4_address_t ip4
Definition: one.api:376
ip6_main_t ip6_main
Definition: ip6_forward.c:2781
ip_interface_address_flags_t flags
Definition: lookup.h:125
static uword mhash_set(mhash_t *h, void *key, uword new_value, uword *old_value)
Definition: mhash.h:117
u32 ip_interface_address_find(ip_lookup_main_t *lm, void *addr_fib, u32 address_length)
Definition: ip_interface.c:24
void ip_interface_address_sweep(void)
Definition: ip_interface.c:289
int ip4_address_compare(ip4_address_t *a1, ip4_address_t *a2)
Definition: ip46_cli.c:53
sll srl srl sll sra u16x4 i
Definition: vector_sse42.h:317
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:380
clib_error_t * ip_interface_address_add(ip_lookup_main_t *lm, u32 sw_if_index, void *addr_fib, u32 address_length, u32 *result_if_address_index)
Definition: ip_interface.c:36
clib_error_t * ip_interface_address_del(ip_lookup_main_t *lm, vnet_main_t *vnm, u32 address_index, void *addr_fib, u32 address_length, u32 sw_if_index)
Definition: ip_interface.c:94
u32 * if_address_pool_index_by_sw_if_index
Head of doubly linked list of interface addresses for each software interface.
Definition: lookup.h:155
static uword * mhash_get(mhash_t *h, const void *key)
Definition: mhash.h:110
ip_lookup_main_t lookup_main
Definition: ip6.h:181
IPv4 main type.
Definition: ip4.h:106
static uword ip6_address_is_link_local_unicast(const ip6_address_t *a)
Definition: ip6_packet.h:253
static vlib_main_t * vlib_get_main(void)
Definition: global_funcs.h:23
vl_api_ip4_address_t hi
Definition: arp.api:37
vl_api_address_t ip
Definition: l2.api:501
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
#define foreach_ip_interface_address(lm, a, sw_if_index, loop, body)
Definition: ip_interface.h:57
u64 uword
Definition: types.h:112
u32 is_ip6
1 for ip6; 0 for ip4.
Definition: lookup.h:176
ip4_main_t ip4_main
Global ip4 main structure.
Definition: ip4_forward.c:1144
clib_error_t * ip6_add_del_interface_address(vlib_main_t *vm, u32 sw_if_index, ip6_address_t *address, u32 address_length, u32 is_del)
Definition: ip6_forward.c:297
u8 si
Definition: lisp_types.api:47
#define vec_validate_init_empty(V, I, INIT)
Make sure vector is long enough for given index and initialize empty space (no header, unspecified alignment)
Definition: vec.h:556
static walk_rc_t ip_interface_address_sweep_one_interface(vnet_main_t *vnm, vnet_sw_interface_t *si, void *ctx)
Definition: ip_interface.c:236
vl_api_interface_index_t sw_if_index
Definition: wireguard.api:33
format_function_t * format_address_and_length
Either format_ip4_address_and_length or format_ip6_address_and_length.
Definition: lookup.h:179