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:
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 #ifndef SRC_VNET_UDP_UDP_INLINES_H_
17 #define SRC_VNET_UDP_UDP_INLINES_H_
19 #include <vnet/vnet.h>
20 #include <vnet/ip/ip4.h>
21 #include <vnet/ip/ip6.h>
22 #include <vnet/udp/udp_packet.h>
23 #include <vnet/interface_output.h>
24 #include <vnet/ip/ip4_inlines.h>
25 #include <vnet/ip/ip6_inlines.h>
26 #include <vnet/udp/udp_encap.h>
29 vlib_buffer_push_udp (vlib_buffer_t *b, u16 sp, u16 dp)
32 u16 udp_len = sizeof (udp_header_t) + b->current_length;
33 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID))
34 udp_len += b->total_length_not_including_first_buffer;
36 uh = vlib_buffer_push_uninit (b, sizeof (udp_header_t));
40 uh->length = clib_host_to_net_u16 (udp_len);
41 vnet_buffer (b)->l4_hdr_offset = (u8 *) uh - b->data;
42 b->flags |= VNET_BUFFER_F_L4_HDR_OFFSET_VALID;
47 * Encode udp source port entropy value per
48 * https://datatracker.ietf.org/doc/html/rfc7510#section-3
51 ip_udp_sport_entropy (vlib_buffer_t *b0)
53 u16 port = clib_host_to_net_u16 (0x03 << 14);
54 port |= vnet_buffer (b0)->ip.flow_hash & 0xffff;
59 ip_udp_compute_flow_hash (vlib_buffer_t *b0, u8 is_ip4)
66 ip4 = (ip4_header_t *) (b0->data + vnet_buffer (b0)->l3_hdr_offset);
67 return ip4_compute_flow_hash (ip4, IP_FLOW_HASH_DEFAULT);
71 ip6 = (ip6_header_t *) (b0->data + vnet_buffer (b0)->l3_hdr_offset);
72 return ip6_compute_flow_hash (ip6, IP_FLOW_HASH_DEFAULT);
77 ip_udp_fixup_one (vlib_main_t *vm, vlib_buffer_t *b0, u8 is_ip4,
89 ip0 = vlib_buffer_get_current (b0);
91 /* fix the <bleep>ing outer-IP checksum */
93 /* old_l0 always 0, see the rewrite setup */
94 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
96 sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
97 length /* changed member */ );
98 ip0->checksum = ip_csum_fold (sum0);
102 udp0 = (udp_header_t *) (ip0 + 1);
103 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
105 udp0->length = new_l0;
108 udp0->src_port = ip_udp_sport_entropy (b0);
115 ip0 = vlib_buffer_get_current (b0);
117 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
119 ip0->payload_length = new_l0;
122 udp0 = (udp_header_t *) (ip0 + 1);
123 udp0->length = new_l0;
126 udp0->src_port = ip_udp_sport_entropy (b0);
129 ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip0, &bogus0);
130 ASSERT (bogus0 == 0);
132 if (udp0->checksum == 0)
133 udp0->checksum = 0xffff;
138 ip_udp_encap_one (vlib_main_t *vm, vlib_buffer_t *b0, u8 *ec0, word ec_len,
139 ip_address_family_t encap_family,
140 ip_address_family_t payload_family,
141 udp_encap_fixup_flags_t flags)
143 u8 sport_entropy = (flags & UDP_ENCAP_FIXUP_UDP_SRC_PORT_ENTROPY) != 0;
145 if (payload_family < N_AF)
147 vnet_calc_checksums_inline (vm, b0, payload_family == AF_IP4,
148 payload_family == AF_IP6);
150 /* Сalculate flow hash to be used for entropy */
151 if (sport_entropy && 0 == vnet_buffer (b0)->ip.flow_hash)
152 vnet_buffer (b0)->ip.flow_hash =
153 ip_udp_compute_flow_hash (b0, payload_family == AF_IP4);
156 vlib_buffer_advance (b0, -ec_len);
158 if (encap_family == AF_IP4)
162 ip0 = vlib_buffer_get_current (b0);
164 /* Apply the encap string. */
165 clib_memcpy_fast (ip0, ec0, ec_len);
166 ip_udp_fixup_one (vm, b0, 1, sport_entropy);
172 ip0 = vlib_buffer_get_current (b0);
174 /* Apply the encap string. */
175 clib_memcpy_fast (ip0, ec0, ec_len);
176 ip_udp_fixup_one (vm, b0, 0, sport_entropy);
181 ip_udp_encap_two (vlib_main_t *vm, vlib_buffer_t *b0, vlib_buffer_t *b1,
182 u8 *ec0, u8 *ec1, word ec_len,
183 ip_address_family_t encap_family,
184 ip_address_family_t payload_family,
185 udp_encap_fixup_flags_t flags0,
186 udp_encap_fixup_flags_t flags1)
189 udp_header_t *udp0, *udp1;
190 int payload_ip4 = (payload_family == AF_IP4);
191 int sport_entropy0 = (flags0 & UDP_ENCAP_FIXUP_UDP_SRC_PORT_ENTROPY) != 0;
192 int sport_entropy1 = (flags1 & UDP_ENCAP_FIXUP_UDP_SRC_PORT_ENTROPY) != 0;
194 if (payload_family < N_AF)
196 vnet_calc_checksums_inline (vm, b0, payload_ip4, !payload_ip4);
197 vnet_calc_checksums_inline (vm, b1, payload_ip4, !payload_ip4);
199 /* Сalculate flow hash to be used for entropy */
200 if (sport_entropy0 && 0 == vnet_buffer (b0)->ip.flow_hash)
201 vnet_buffer (b0)->ip.flow_hash =
202 ip_udp_compute_flow_hash (b0, payload_ip4);
203 if (sport_entropy1 && 0 == vnet_buffer (b1)->ip.flow_hash)
204 vnet_buffer (b1)->ip.flow_hash =
205 ip_udp_compute_flow_hash (b1, payload_ip4);
208 vlib_buffer_advance (b0, -ec_len);
209 vlib_buffer_advance (b1, -ec_len);
211 if (encap_family == AF_IP4)
213 ip4_header_t *ip0, *ip1;
214 ip_csum_t sum0, sum1;
215 u16 old_l0 = 0, old_l1 = 0;
217 ip0 = vlib_buffer_get_current (b0);
218 ip1 = vlib_buffer_get_current (b1);
220 /* Apply the encap string */
221 clib_memcpy_fast (ip0, ec0, ec_len);
222 clib_memcpy_fast (ip1, ec1, ec_len);
224 /* fix the <bleep>ing outer-IP checksum */
225 sum0 = ip0->checksum;
226 sum1 = ip1->checksum;
228 /* old_l0 always 0, see the rewrite setup */
229 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
230 new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1));
232 sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
233 length /* changed member */ );
234 sum1 = ip_csum_update (sum1, old_l1, new_l1, ip4_header_t,
235 length /* changed member */ );
237 ip0->checksum = ip_csum_fold (sum0);
238 ip1->checksum = ip_csum_fold (sum1);
240 ip0->length = new_l0;
241 ip1->length = new_l1;
244 udp0 = (udp_header_t *) (ip0 + 1);
245 udp1 = (udp_header_t *) (ip1 + 1);
248 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) -
251 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1) -
253 udp0->length = new_l0;
254 udp1->length = new_l1;
257 udp0->src_port = ip_udp_sport_entropy (b0);
259 udp1->src_port = ip_udp_sport_entropy (b1);
263 ip6_header_t *ip0, *ip1;
266 ip0 = vlib_buffer_get_current (b0);
267 ip1 = vlib_buffer_get_current (b1);
269 /* Apply the encap string. */
270 clib_memcpy_fast (ip0, ec0, ec_len);
271 clib_memcpy_fast (ip1, ec1, ec_len);
273 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
275 new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1)
277 ip0->payload_length = new_l0;
278 ip1->payload_length = new_l1;
281 udp0 = (udp_header_t *) (ip0 + 1);
282 udp1 = (udp_header_t *) (ip1 + 1);
284 udp0->length = new_l0;
285 udp1->length = new_l1;
288 udp0->src_port = ip_udp_sport_entropy (b0);
290 udp1->src_port = ip_udp_sport_entropy (b1);
293 ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip0, &bogus0);
295 ip6_tcp_udp_icmp_compute_checksum (vm, b1, ip1, &bogus1);
296 ASSERT (bogus0 == 0);
297 ASSERT (bogus1 == 0);
299 if (udp0->checksum == 0)
300 udp0->checksum = 0xffff;
301 if (udp1->checksum == 0)
302 udp1->checksum = 0xffff;
306 #endif /* SRC_VNET_UDP_UDP_INLINES_H_ */
309 * fd.io coding-style-patch-verification: ON
312 * eval: (c-set-style "gnu")