2 * Copyright (c) 2016 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/ip6.h: ip6 main include file
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_ip6_inlines_h
41 #define included_ip_ip6_inlines_h
43 #include <vnet/ip/ip6_packet.h>
44 #include <vnet/ip/ip6_hop_by_hop_packet.h>
46 /* Compute flow hash. We'll use it to select which Sponge to use for this
47 flow. And other things. */
49 ip6_compute_flow_hash (const ip6_header_t * ip,
50 flow_hash_config_t flow_hash_config)
52 const tcp_header_t *tcp;
53 const udp_header_t *udp = (void *) (ip + 1);
54 const gtpv1u_header_t *gtpu = (void *) (udp + 1);
59 u8 protocol = ip->protocol;
60 uword is_udp = protocol == IP_PROTOCOL_UDP;
62 if (PREDICT_TRUE ((protocol == IP_PROTOCOL_TCP) || is_udp))
65 tcp = (void *) (ip + 1);
69 const void *cur = ip + 1;
70 if (protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS)
72 const ip6_hop_by_hop_header_t *hbh = cur;
73 protocol = hbh->protocol;
74 cur += (hbh->length + 1) * 8;
76 if (protocol == IP_PROTOCOL_IPV6_FRAGMENTATION)
78 const ip6_fragment_ext_header_t *frag = cur;
79 protocol = frag->protocol;
81 else if (protocol == IP_PROTOCOL_TCP || protocol == IP_PROTOCOL_UDP)
88 t1 = (ip->src_address.as_u64[0] ^ ip->src_address.as_u64[1]);
89 t1 = (flow_hash_config & IP_FLOW_HASH_SRC_ADDR) ? t1 : 0;
91 t2 = (ip->dst_address.as_u64[0] ^ ip->dst_address.as_u64[1]);
92 t2 = (flow_hash_config & IP_FLOW_HASH_DST_ADDR) ? t2 : 0;
94 a = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t2 : t1;
95 b = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t1 : t2;
97 t1 = is_tcp_udp ? tcp->src : 0;
98 t2 = is_tcp_udp ? tcp->dst : 0;
100 t1 = (flow_hash_config & IP_FLOW_HASH_SRC_PORT) ? t1 : 0;
101 t2 = (flow_hash_config & IP_FLOW_HASH_DST_PORT) ? t2 : 0;
103 if (flow_hash_config & IP_FLOW_HASH_SYMMETRIC)
119 b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? protocol : 0;
120 c = ((flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? ((t1 << 16) | t2) :
122 t1 = ((u64) ip_flow_hash_router_id << 32);
124 ((flow_hash_config & IP_FLOW_HASH_FL) ? ip6_flow_label_network_order (ip) :
127 if (PREDICT_TRUE (is_udp) &&
128 PREDICT_FALSE ((flow_hash_config & IP_FLOW_HASH_GTPV1_TEID) &&
129 udp->dst_port == GTPV1_PORT_BE))
134 hash_mix64 (a, b, c);
140 * This function is to search for the header specified by the protocol number
142 * This is used to locate a specific IPv6 extension header
143 * or to find transport layer header.
144 * 1. If the find_hdr_type < 0 then it finds and returns the protocol number and
145 * offset stored in *offset of the transport or ESP header in the chain if
147 * 2. If a header with find_hdr_type > 0 protocol number is found then the
148 * offset is stored in *offset and protocol number of the header is
150 * 3. If find_hdr_type is not found or packet is malformed or
151 * it is a non-first fragment -1 is returned.
154 ip6_locate_header (vlib_buffer_t *b, ip6_header_t *ip, int find_hdr_type,
157 ip6_ext_hdr_chain_t hdr_chain;
158 int res = ip6_ext_header_walk (b, ip, find_hdr_type, &hdr_chain);
161 *offset = hdr_chain.eh[res].offset;
162 return hdr_chain.eh[res].protocol;
169 * Push IPv6 header to buffer
171 * @param vm - vlib_main
172 * @param b - buffer to write the header to
173 * @param src - source IP
174 * @param dst - destination IP
175 * @param prot - payload proto
176 * @param flow_label - flow label
178 * @return - pointer to start of IP header
181 vlib_buffer_push_ip6_custom (vlib_main_t * vm, vlib_buffer_t * b,
182 ip6_address_t * src, ip6_address_t * dst,
183 int proto, u32 flow_label)
189 ip6h = vlib_buffer_push_uninit (b, sizeof (ip6_header_t));
190 ASSERT (flow_label < 1 << 20);
191 ip6h->ip_version_traffic_class_and_flow_label =
192 clib_host_to_net_u32 ((0x6 << 28) | flow_label);
194 /* calculate ip6 payload length */
195 payload_length = vlib_buffer_length_in_chain (vm, b);
196 payload_length -= sizeof (*ip6h);
198 ip6h->payload_length = clib_host_to_net_u16 (payload_length);
200 ip6h->hop_limit = 0xff;
201 ip6h->protocol = proto;
202 clib_memcpy_fast (ip6h->src_address.as_u8, src->as_u8,
203 sizeof (ip6h->src_address));
204 clib_memcpy_fast (ip6h->dst_address.as_u8, dst->as_u8,
205 sizeof (ip6h->src_address));
206 vnet_buffer (b)->l3_hdr_offset = (u8 *) ip6h - b->data;
207 b->flags |= VNET_BUFFER_F_IS_IP6 | VNET_BUFFER_F_L3_HDR_OFFSET_VALID;
213 * Push IPv6 header to buffer
215 * @param vm - vlib_main
216 * @param b - buffer to write the header to
217 * @param src - source IP
218 * @param dst - destination IP
219 * @param prot - payload proto
221 * @return - pointer to start of IP header
224 vlib_buffer_push_ip6 (vlib_main_t * vm, vlib_buffer_t * b,
225 ip6_address_t * src, ip6_address_t * dst, int proto)
227 return vlib_buffer_push_ip6_custom (vm, b, src, dst, proto,
228 0 /* flow label */ );
232 #endif /* included_ip_ip6_h */
235 * fd.io coding-style-patch-verification: ON
238 * eval: (c-set-style "gnu")