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.
16 * ip/ip_packet.h: packet format common between ip4 & ip6
18 * Copyright (c) 2008 Eliot Dresselhaus
20 * Permission is hereby granted, free of charge, to any person obtaining
21 * a copy of this software and associated documentation files (the
22 * "Software"), to deal in the Software without restriction, including
23 * without limitation the rights to use, copy, modify, merge, publish,
24 * distribute, sublicense, and/or sell copies of the Software, and to
25 * permit persons to whom the Software is furnished to do so, subject to
26 * the following conditions:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 #ifndef included_ip_packet_h
41 #define included_ip_packet_h
43 #include <vppinfra/byte_order.h>
44 #include <vppinfra/error.h>
46 typedef enum ip_protocol
48 #define ip_protocol(n,s) IP_PROTOCOL_##s = n,
49 #include "protocols.def"
56 #define ip_port(s,n) IP_PORT_##s = n,
61 /* Classifies protocols into UDP, ICMP or other. */
64 IP_BUILTIN_PROTOCOL_UDP,
65 IP_BUILTIN_PROTOCOL_ICMP,
66 IP_BUILTIN_PROTOCOL_UNKNOWN,
67 } ip_builtin_protocol_t;
69 #define foreach_ip_builtin_multicast_group \
70 _ (1, all_hosts_on_subnet) \
71 _ (2, all_routers_on_subnet) \
73 _ (5, ospf_all_routers) \
74 _ (6, ospf_designated_routers) \
82 #define _(n,f) IP_MULTICAST_GROUP_##f = n,
83 foreach_ip_builtin_multicast_group
85 } ip_multicast_group_t;
87 /* IP checksum support. */
89 static_always_inline u16
90 ip_csum (void *data, u16 n_left)
93 #ifdef CLIB_HAVE_VEC256
100 /* if there is odd number of bytes, pad by zero and store in sum */
101 sum = (n_left & 1) ? ((u8 *) data)[n_left - 1] << 8 : 0;
103 /* we deal with words */
106 #ifdef CLIB_HAVE_VEC256
109 v1 = u16x16_load_unaligned (data);
110 v2 = u16x16_load_unaligned (data + 32);
112 #ifdef CLIB_ARCH_IS_LITTLE_ENDIAN
113 v1 = u16x16_byte_swap (v1);
114 v2 = u16x16_byte_swap (v2);
116 sum8 += u16x8_extend_to_u32x8 (u16x16_extract_lo (v1));
117 sum8 += u16x8_extend_to_u32x8 (u16x16_extract_hi (v1));
118 sum8 += u16x8_extend_to_u32x8 (u16x16_extract_lo (v2));
119 sum8 += u16x8_extend_to_u32x8 (u16x16_extract_hi (v2));
126 v1 = u16x16_load_unaligned (data);
127 #ifdef CLIB_ARCH_IS_LITTLE_ENDIAN
128 v1 = u16x16_byte_swap (v1);
130 v1 = u16x16_byte_swap (u16x16_load_unaligned (data));
131 sum8 += u16x8_extend_to_u32x8 (u16x16_extract_lo (v1));
132 sum8 += u16x8_extend_to_u32x8 (u16x16_extract_hi (v1));
139 v1 = u16x16_load_unaligned (data);
140 #ifdef CLIB_ARCH_IS_LITTLE_ENDIAN
141 v1 = u16x16_byte_swap (v1);
143 v1 = u16x16_mask_last (v1, 16 - n_left);
144 sum8 += u16x8_extend_to_u32x8 (u16x16_extract_lo (v1));
145 sum8 += u16x8_extend_to_u32x8 (u16x16_extract_hi (v1));
148 sum8 = u32x8_hadd (sum8, zero);
149 sum4 = u32x8_extract_lo (sum8) + u32x8_extract_hi (sum8);
150 sum = sum4[0] + sum4[1];
156 sum += clib_net_to_host_u16 (*((u16 *) data + 0));
157 sum += clib_net_to_host_u16 (*((u16 *) data + 1));
158 sum += clib_net_to_host_u16 (*((u16 *) data + 2));
159 sum += clib_net_to_host_u16 (*((u16 *) data + 3));
160 sum += clib_net_to_host_u16 (*((u16 *) data + 4));
161 sum += clib_net_to_host_u16 (*((u16 *) data + 5));
162 sum += clib_net_to_host_u16 (*((u16 *) data + 6));
163 sum += clib_net_to_host_u16 (*((u16 *) data + 7));
169 sum += clib_net_to_host_u16 (*(u16 *) data);
175 sum = (sum & 0xffff) + (sum >> 16);
176 sum = (sum & 0xffff) + (sum >> 16);
180 /* Incremental checksum update. */
181 typedef uword ip_csum_t;
183 always_inline ip_csum_t
184 ip_csum_with_carry (ip_csum_t sum, ip_csum_t x)
186 ip_csum_t t = sum + x;
190 /* Update checksum changing field at even byte offset from x -> 0. */
191 always_inline ip_csum_t
192 ip_csum_add_even (ip_csum_t c, ip_csum_t x)
198 /* Fold in carry from high bit. */
201 ip_csum_t t = ip_csum_with_carry (d, x);
202 ASSERT ((t - c == 0) || (t - c == ~0));
207 /* Update checksum changing field at even byte offset from 0 -> x. */
208 always_inline ip_csum_t
209 ip_csum_sub_even (ip_csum_t c, ip_csum_t x)
211 return ip_csum_with_carry (c, x);
214 always_inline ip_csum_t
215 ip_csum_update_inline (ip_csum_t sum, ip_csum_t old, ip_csum_t new,
216 u32 field_byte_offset, u32 field_n_bytes)
218 /* For even 1-byte fields on big-endian and odd 1-byte fields on little endian
219 we need to shift byte into place for checksum. */
220 if ((field_n_bytes % 2)
221 && (field_byte_offset % 2) == CLIB_ARCH_IS_LITTLE_ENDIAN)
226 sum = ip_csum_sub_even (sum, old);
227 sum = ip_csum_add_even (sum, new);
231 #define ip_csum_update(sum,old,new,type,field) \
232 ip_csum_update_inline ((sum), (old), (new), \
233 STRUCT_OFFSET_OF (type, field), \
234 STRUCT_SIZE_OF (type, field))
237 ip_csum_fold (ip_csum_t c)
239 /* Reduce to 16 bits. */
241 c = (c & (ip_csum_t) 0xffffffff) + (c >> (ip_csum_t) 32);
242 c = (c & 0xffff) + (c >> 16);
245 c = (c & 0xffff) + (c >> 16);
246 c = (c & 0xffff) + (c >> 16);
251 extern ip_csum_t (*vnet_incremental_checksum_fp) (ip_csum_t, void *, uword);
253 always_inline ip_csum_t
254 ip_incremental_checksum (ip_csum_t sum, void *_data, uword n_bytes)
256 return (*vnet_incremental_checksum_fp) (sum, _data, n_bytes);
260 ip_csum_and_memcpy_fold (ip_csum_t sum, void *dst)
262 return ip_csum_fold (sum);
265 /* Checksum routine. */
266 ip_csum_t ip_incremental_checksum (ip_csum_t sum, void *data, uword n_bytes);
268 #endif /* included_ip_packet_h */
271 * fd.io coding-style-patch-verification: ON
274 * eval: (c-set-style "gnu")