aboutsummaryrefslogtreecommitdiffstats
path: root/lib/src/common.h
blob: 1d4b1e6bf4df622b455b35fd471441857500b3d1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
/*
 * Copyright (c) 2017-2019 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @file common.c
 * @brief Common interfaces abstracting low-level platform.
 * details.
 *
 * The role of this header file is to provide an uniform interface to the
 * different platform on top of which we build the hICN interface:
 *  - syntax helpers
 *  - IP address management
 *  - protocol definition
 *  - ...
 *
 * The rationale is to leverage as much as possible platform-specific code,
 * however some level of harmonization is needed to build code on top. Whenever
 * possible, we align to VPP structure and naming.
 */

#ifndef HICN_COMMON_H
#define HICN_COMMON_H

#include <stdint.h>
#include <assert.h>

/* Concise type definitions */

typedef uint64_t u64;
typedef uint32_t u32;
typedef uint16_t u16;
typedef uint8_t u8;

/*
 * Code annotations
 *
 * NOTE: these are defined by default in VPP.
 */

#ifndef HICN_VPP_PLUGIN

#define PREDICT_FALSE(x) (x)
#define PREDICT_TRUE(x) (x)
#define always_inline static inline
#define static_always_inline static inline
#define STRUCT_SIZE_OF(type, member) sizeof(((type *)0)->member)
#define ASSERT

#define STATIC_ASSERT(x)

#endif /* ! HICN_VPP_PLUGIN */

/*
 * Windows compilers do not support named initilizers when .h files are included
 * inside C++ files. For readability, we either use the following macro, or
 * duplicate some code, with the intent of preserving those safeguards for
 * non-Windows platforms.
 */
#ifndef _WIN32
#define ATTR_INIT(key, value) .key = value
#else
#define ATTR_INIT(key, value) value
#endif

#ifdef _WIN32
 /* Endianness detection for Windows platforms */
#define __ORDER_LITTLE_ENDIAN__ 0x41424344UL
#define __ORDER_BIG_ENDIAN__    0x44434241UL
#define __BYTE_ORDER__ ('ABCD')

 /* Windows compatibility headers */
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock2.h>
#include <ws2ipdef.h>
#include <Ws2tcpip.h>
#include <In6addr.h>

#define strdup _strdup
#define __attribute__(A)

#ifndef  IOVEC
#define IOVEC
#define UIO_MAXIOV 16
#define IOV_MAX UIO_MAXIOV
struct iovec
{
  void *iov_base;
  size_t iov_len;
};
#endif
#endif

/*
 * Portable attribute packed.
 */
#ifndef _WIN32
#define PACKED( __Declaration__ ) __Declaration__ __attribute__((__packed__))
#else
#define PACKED( __Declaration__ ) __pragma( pack(push, 1) ) __Declaration__ __pragma( pack(pop) )
#endif


/*
 * IP address types
 */

#ifdef HICN_VPP_PLUGIN

#include <vnet/ip/ip4_packet.h>	// ip4_address_t
#include <vnet/ip/ip6_packet.h>	// ip6_address_t

#else


#ifndef _WIN32
#include <netinet/in.h>
#endif

typedef union
{
  u32 as_u32;
  struct in_addr as_inaddr;
} ip4_address_t;

typedef union
{
  u64 as_u64[2];
  u32 as_u32[4];
  u8 as_u8[16];
  struct in6_addr as_in6addr;
} ip6_address_t;

typedef union
{
  struct
  {
    u32 pad[3];
    ip4_address_t ip4;
  };
  ip6_address_t ip6;
} ip46_address_t;

#define ip46_address_is_ip4(ip46)       (((ip46)->pad[0] | (ip46)->pad[1] | (ip46)->pad[2]) == 0)

#endif /* ! HICN_VPP_PLUGIN */

/**
 * @brief Returns the family of an IP address
 * @param [in] ip_address - IP address in presentation format
 * @return AF_INET or AF_INET6 if successful, -1 otherwise
 */
int get_addr_family (const char *ip_address);

/*
 * Checksum computation
 *
 * NOTE: VPP provides efficient (incremental) checksum computations
 * that we reuse, and provide alternative implementation otherwise.
 */

#ifndef HICN_VPP_PLUGIN

typedef u16 ip_csum_t;

/*
 * Checksum update (incremental and non-incremental)
 *
 * Those functions are already defined in VPP in vnet/ip/ip_packet.h, and we
 * borrow this code here.
 */

static_always_inline u16
ip_csum_fold (ip_csum_t c)
{
  /* Reduce to 16 bits. */
#if 0				// uword_bits == 64
  c = (c & (ip_csum_t) 0xffffffff) + (c >> (ip_csum_t) 32);
  c = (c & 0xffff) + (c >> 16);
#endif

  c = (c & 0xffff) + (c >> 16);
  c = (c & 0xffff) + (c >> 16);

  return c;
}

static_always_inline ip_csum_t
ip_csum_with_carry (ip_csum_t sum, ip_csum_t x)
{
  ip_csum_t t = sum + x;
  return t + (t < x);
}

/* Update checksum changing field at even byte offset from x -> 0. */
static_always_inline ip_csum_t
ip_csum_add_even (ip_csum_t c, ip_csum_t x)
{
  ip_csum_t d;

  d = c - x;

  /* Fold in carry from high bit. */
  d -= d > c;

  return d;
}

/* Update checksum changing field at even byte offset from 0 -> x. */
static_always_inline ip_csum_t
ip_csum_sub_even (ip_csum_t c, ip_csum_t x)
{
  return ip_csum_with_carry (c, x);
}

u32 cumulative_hash32 (const void *data, size_t len, u32 lastValue);
u32 hash32 (const void *data, size_t len);
u64 cumulative_hash64 (const void *data, size_t len, u64 lastValue);
u64 hash64 (const void *data, size_t len);
void hicn_packet_dump (uint8_t * buffer, size_t len);

#endif /* ! HICN_VPP_PLUGIN */

/**
 * @brief Computes buffer checksum
 * @param [in] addr - Pointer to buffer start
 * @param [in] size - Size of buffer
 * @param [in] init - Checksum initial value
 * @return Checksum of specified buffer
 */
always_inline u16
csum (const void *addr, size_t size, u16 init)
{
  u32 sum = init;
  const u16 *bytes = (u16 *) addr;

  while (size > 1)
    {
      sum += *bytes++;
      size -= sizeof (u16);
    }
  if (size)
    {
      sum += *(const u8 *) bytes;
    }
  sum = (sum >> 16) + (sum & 0xffff);
  sum += (sum >> 16);

  return (u16) ~ sum;
}

/*
 * Useful aliases
 */

/* Symmetry with IPPROTO_ICMPV6 */
#define IPPROTO_ICMPV4 IPPROTO_ICMP

/*
 * Query IP version from packet (either 4 or 6)
 * (version is located as same offsets in both protocol headers)
 */
#define HICN_IP_VERSION(packet) ((hicn_header_t *)packet)->v4.ip.version

/*
 * ntohll / htonll allows byte swapping for 64 bits integers
 */
#ifndef htonll
#define htonll(x) ((1==htonl(1)) ? (x) : ((uint64_t)htonl((x) & 0xFFFFFFFF) << 32) | htonl((x) >> 32))
#endif

#ifndef ntohll
#define ntohll(x) ((1==ntohl(1)) ? (x) : ((uint64_t)ntohl((x) & 0xFFFFFFFF) << 32) | ntohl((x) >> 32))
#endif

#endif /* HICN_COMMON_H */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */