FD.io VPP  v19.04.1-1-ge4a0f9f
Vector Packet Processing
ip.c
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1 /*
2  * Copyright (c) 2017 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 #include <vnet/fib/fib_table.h>
18 
19 u8
20 ip_is_zero (ip46_address_t * ip46_address, u8 is_ip4)
21 {
22  if (is_ip4)
23  return (ip46_address->ip4.as_u32 == 0);
24  else
25  return (ip46_address->as_u64[0] == 0 && ip46_address->as_u64[1] == 0);
26 }
27 
28 u8
29 ip_is_local_host (ip46_address_t * ip46_address, u8 is_ip4)
30 {
31  if (is_ip4)
32  return (ip46_address->ip4.as_u8[0] == 127);
33  else
34  return (ip46_address->as_u64[0] == 0 &&
35  clib_net_to_host_u64 (ip46_address->as_u64[1]) == 1);
36 }
37 
38 u8
40 {
41  return (ip4_address->as_u8[0] == 127);
42 }
43 
44 u8
46 {
47  return (ip6_address->as_u64[0] == 0 &&
48  clib_net_to_host_u64 (ip6_address->as_u64[1]) == 1);
49 }
50 
51 /**
52  * Checks that an ip is local to the requested fib
53  */
54 u8
55 ip_is_local (u32 fib_index, ip46_address_t * ip46_address, u8 is_ip4)
56 {
57  fib_node_index_t fei;
60 
61  /* Check if requester is local */
62  if (is_ip4)
63  {
64  prefix.fp_len = 32;
65  prefix.fp_proto = FIB_PROTOCOL_IP4;
66  }
67  else
68  {
69  prefix.fp_len = 128;
70  prefix.fp_proto = FIB_PROTOCOL_IP6;
71  }
72 
73  clib_memcpy_fast (&prefix.fp_addr, ip46_address, sizeof (ip46_address_t));
74  fei = fib_table_lookup (fib_index, &prefix);
75  flags = fib_entry_get_flags (fei);
76 
77  return (flags & FIB_ENTRY_FLAG_LOCAL);
78 }
79 
80 void
81 ip_copy (ip46_address_t * dst, ip46_address_t * src, u8 is_ip4)
82 {
83  if (is_ip4)
84  dst->ip4.as_u32 = src->ip4.as_u32;
85  else
86  clib_memcpy_fast (&dst->ip6, &src->ip6, sizeof (ip6_address_t));
87 }
88 
89 void
90 ip_set (ip46_address_t * dst, void *src, u8 is_ip4)
91 {
92  if (is_ip4)
93  dst->ip4.as_u32 = ((ip4_address_t *) src)->as_u32;
94  else
95  clib_memcpy_fast (&dst->ip6, (ip6_address_t *) src,
96  sizeof (ip6_address_t));
97 }
98 
99 u8
100 ip_interface_has_address (u32 sw_if_index, ip46_address_t * ip, u8 is_ip4)
101 {
102  ip_interface_address_t *ia = 0;
103 
104  if (is_ip4)
105  {
107  ip4_address_t *ip4;
108  /* *INDENT-OFF* */
109  foreach_ip_interface_address (lm4, ia, sw_if_index, 1 /* unnumbered */ ,
110  ({
111  ip4 = ip_interface_address_get_address (lm4, ia);
112  if (ip4_address_compare (ip4, &ip->ip4) == 0)
113  return 1;
114  }));
115  /* *INDENT-ON* */
116  }
117  else
118  {
120  ip6_address_t *ip6;
121  /* *INDENT-OFF* */
122  foreach_ip_interface_address (lm6, ia, sw_if_index, 1 /* unnumbered */ ,
123  ({
124  ip6 = ip_interface_address_get_address (lm6, ia);
125  if (ip6_address_compare (ip6, &ip->ip6) == 0)
126  return 1;
127  }));
128  /* *INDENT-ON* */
129  }
130  return 0;
131 }
132 
133 void *
135 {
138  ip_interface_address_t *ia = 0;
139 
140  if (is_ip4)
141  {
142  /* *INDENT-OFF* */
143  foreach_ip_interface_address (lm4, ia, sw_if_index, 1 /* unnumbered */ ,
144  ({
145  return ip_interface_address_get_address (lm4, ia);
146  }));
147  /* *INDENT-ON* */
148  }
149  else
150  {
151  /* *INDENT-OFF* */
152  foreach_ip_interface_address (lm6, ia, sw_if_index, 1 /* unnumbered */ ,
153  ({
154  ip6_address_t *rv;
155  rv = ip_interface_address_get_address (lm6, ia);
156  /* Trying to use a link-local ip6 src address is a fool's errand */
158  return rv;
159  }));
160  /* *INDENT-ON* */
161  }
162 
163  return 0;
164 }
165 
166 void
168 {
169  ASSERT (preflen <= 32);
170  if (preflen == 0)
171  ip4->data_u32 = 0;
172  else
173  ip4->data_u32 &= clib_net_to_host_u32 (0xffffffff << (32 - preflen));
174 }
175 
176 void
178 {
179  ASSERT (preflen <= 128);
180  if (preflen == 0)
181  {
182  ip6->as_u64[0] = 0;
183  ip6->as_u64[1] = 0;
184  }
185  else if (preflen <= 64)
186  {
187  ip6->as_u64[0] &=
188  clib_host_to_net_u64 (0xffffffffffffffffL << (64 - preflen));
189  ip6->as_u64[1] = 0;
190  }
191  else
192  ip6->as_u64[1] &=
193  clib_host_to_net_u64 (0xffffffffffffffffL << (128 - preflen));
194 }
195 
196 void
198 {
199  if (pref_len == 0)
200  ip->as_u32 = 0;
201  else
202  ip->as_u32 = clib_host_to_net_u32 (~((1 << (32 - pref_len)) - 1));
203 }
204 
205 u32
207 {
208  if (mask->as_u32 == 0)
209  return 0;
210  return (32 - log2_first_set (clib_net_to_host_u32 (mask->as_u32)));
211 }
212 
213 void
215  ip4_address_t * res)
216 {
217  u32 not_mask;
218  not_mask = (1 << (32 - plen)) - 1;
219  res->as_u32 = clib_net_to_host_u32 (ip->as_u32) + not_mask;
220 }
221 
222 void
224 {
225  if (pref_len == 0)
226  {
227  mask->as_u64[0] = 0;
228  mask->as_u64[1] = 0;
229  }
230  else if (pref_len <= 64)
231  {
232  mask->as_u64[0] =
233  clib_host_to_net_u64 (0xffffffffffffffffL << (64 - pref_len));
234  mask->as_u64[1] = 0;
235  }
236  else
237  {
238  mask->as_u64[1] =
239  clib_host_to_net_u64 (0xffffffffffffffffL << (128 - pref_len));
240  }
241 }
242 
243 void
245  ip6_address_t * res)
246 {
247  u64 not_mask;
248  if (plen == 0)
249  {
250  res->as_u64[0] = 0xffffffffffffffffL;
251  res->as_u64[1] = 0xffffffffffffffffL;
252  }
253  else if (plen <= 64)
254  {
255  not_mask = ((u64) 1 << (64 - plen)) - 1;
256  res->as_u64[0] = clib_net_to_host_u64 (ip->as_u64[0]) + not_mask;
257  res->as_u64[1] = 0xffffffffffffffffL;
258  }
259  else
260  {
261  not_mask = ((u64) 1 << (128 - plen)) - 1;
262  res->as_u64[1] = clib_net_to_host_u64 (ip->as_u64[1]) + not_mask;
263  }
264 }
265 
266 u32
268 {
269  u8 first1, first0;
270  if (mask->as_u64[0] == 0 && mask->as_u64[1] == 0)
271  return 0;
272  first1 = log2_first_set (clib_net_to_host_u64 (mask->as_u64[1]));
273  first0 = log2_first_set (clib_net_to_host_u64 (mask->as_u64[0]));
274 
275  if (first1 != 0)
276  return 128 - first1;
277  else
278  return 64 - first0;
279 }
280 
281 /*
282  * fd.io coding-style-patch-verification: ON
283  *
284  * Local Variables:
285  * eval: (c-set-style "gnu")
286  * End:
287  */
#define foreach_ip_interface_address(lm, a, sw_if_index, loop, body)
Definition: lookup.h:182
u32 sw_if_index
Definition: ipsec_gre.api:37
fib_protocol_t fp_proto
protocol type
Definition: fib_types.h:212
void ip6_preflen_to_mask(u8 pref_len, ip6_address_t *mask)
Definition: ip.c:223
void ip4_preflen_to_mask(u8 pref_len, ip4_address_t *ip)
Definition: ip.c:197
u32 flags
Definition: vhost_user.h:115
void ip_copy(ip46_address_t *dst, ip46_address_t *src, u8 is_ip4)
Definition: ip.c:81
static uword log2_first_set(uword x)
Definition: clib.h:259
u8 ip_is_local(u32 fib_index, ip46_address_t *ip46_address, u8 is_ip4)
Checks that an ip is local to the requested fib.
Definition: ip.c:55
u64 as_u64[2]
Definition: ip6_packet.h:51
unsigned long u64
Definition: types.h:89
void ip_set(ip46_address_t *dst, void *src, u8 is_ip4)
Definition: ip.c:90
#define clib_memcpy_fast(a, b, c)
Definition: string.h:81
u8 ip_interface_has_address(u32 sw_if_index, ip46_address_t *ip, u8 is_ip4)
Definition: ip.c:100
ip_lookup_main_t lookup_main
Definition: ip4.h:98
void * ip_interface_get_first_ip(u32 sw_if_index, u8 is_ip4)
Definition: ip.c:134
vl_api_ip4_address_t dst
Definition: ipsec_gre.api:39
unsigned char u8
Definition: types.h:56
void ip6_prefix_max_address_host_order(ip6_address_t *ip, u8 plen, ip6_address_t *res)
Definition: ip.c:244
void ip4_address_normalize(ip4_address_t *ip4, u8 preflen)
Definition: ip.c:167
Aggregrate type for a prefix.
Definition: fib_types.h:203
unsigned int u32
Definition: types.h:88
u16 fp_len
The mask length.
Definition: fib_types.h:207
fib_node_index_t fib_table_lookup(u32 fib_index, const fib_prefix_t *prefix)
Perfom a longest prefix match in the non-forwarding table.
Definition: fib_table.c:66
Definition: fib_entry.h:280
ip46_address_t fp_addr
The address type is not deriveable from the fp_addr member.
Definition: fib_types.h:226
void ip6_address_normalize(ip6_address_t *ip6, u8 preflen)
Definition: ip.c:177
int ip6_address_compare(ip6_address_t *a1, ip6_address_t *a2)
Definition: ip46_cli.c:60
vl_api_ip4_address_t src
Definition: ipsec_gre.api:38
u32 ip6_mask_to_preflen(ip6_address_t *mask)
Definition: ip.c:267
int ip4_address_compare(ip4_address_t *a1, ip4_address_t *a2)
Definition: ip46_cli.c:53
u8 ip6_address[16]
Definition: ip_types.api:18
u8 ip4_is_local_host(ip4_address_t *ip4_address)
Definition: ip.c:39
u32 fib_node_index_t
A typedef of a node index.
Definition: fib_types.h:30
u32 ip4_mask_to_preflen(ip4_address_t *mask)
Definition: ip.c:206
u8 ip6_is_local_host(ip6_address_t *ip6_address)
Definition: ip.c:45
enum fib_entry_flag_t_ fib_entry_flag_t
#define ASSERT(truth)
ip6_main_t ip6_main
Definition: ip6_forward.c:2680
ip_lookup_main_t lookup_main
Definition: ip6.h:179
static uword ip6_address_is_link_local_unicast(const ip6_address_t *a)
Definition: ip6_packet.h:328
u8 ip_is_zero(ip46_address_t *ip46_address, u8 is_ip4)
Definition: ip.c:20
u8 ip4_address[4]
Definition: ip_types.api:17
void ip4_prefix_max_address_host_order(ip4_address_t *ip, u8 plen, ip4_address_t *res)
Definition: ip.c:214
u8 ip_is_local_host(ip46_address_t *ip46_address, u8 is_ip4)
Definition: ip.c:29
typedef prefix
Definition: ip_types.api:35
ip4_main_t ip4_main
Global ip4 main structure.
Definition: ip4_forward.c:905
static void * ip_interface_address_get_address(ip_lookup_main_t *lm, ip_interface_address_t *a)
Definition: lookup.h:175
fib_entry_flag_t fib_entry_get_flags(fib_node_index_t fib_entry_index)
Definition: fib_entry.c:301