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/ip4.h: ip4 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_ip4_inlines_h
41 #define included_ip_ip4_inlines_h
43 #include <vnet/ip/ip_flow_hash.h>
44 #include <vnet/ip/ip4_packet.h>
45 #include <vnet/tcp/tcp_packet.h>
46 #include <vnet/udp/udp_packet.h>
48 #define IP_DF 0x4000 /* don't fragment */
50 /* Compute flow hash. We'll use it to select which adjacency to use for this
51 flow. And other things. */
53 ip4_compute_flow_hash (const ip4_header_t * ip,
54 flow_hash_config_t flow_hash_config)
56 tcp_header_t *tcp = (void *) (ip + 1);
57 udp_header_t *udp = (void *) (ip + 1);
58 gtpv1u_header_t *gtpu = (void *) (udp + 1);
60 uword is_udp = ip->protocol == IP_PROTOCOL_UDP;
61 uword is_tcp_udp = (ip->protocol == IP_PROTOCOL_TCP || is_udp);
63 t1 = (flow_hash_config & IP_FLOW_HASH_SRC_ADDR)
64 ? ip->src_address.data_u32 : 0;
65 t2 = (flow_hash_config & IP_FLOW_HASH_DST_ADDR)
66 ? ip->dst_address.data_u32 : 0;
68 a = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t2 : t1;
69 b = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t1 : t2;
71 t1 = is_tcp_udp ? tcp->src : 0;
72 t2 = is_tcp_udp ? tcp->dst : 0;
74 t1 = (flow_hash_config & IP_FLOW_HASH_SRC_PORT) ? t1 : 0;
75 t2 = (flow_hash_config & IP_FLOW_HASH_DST_PORT) ? t2 : 0;
77 if (flow_hash_config & IP_FLOW_HASH_SYMMETRIC)
93 b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? ip->protocol : 0;
94 c = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ?
95 (t1 << 16) | t2 : (t2 << 16) | t1;
96 if (PREDICT_TRUE (is_udp) &&
97 PREDICT_FALSE ((flow_hash_config & IP_FLOW_HASH_GTPV1_TEID) &&
98 udp->dst_port == GTPV1_PORT_BE))
103 a ^= ip_flow_hash_router_id;
105 hash_v3_mix32 (a, b, c);
106 hash_v3_finalize32 (a, b, c);
112 vlib_buffer_push_ip4_custom (vlib_main_t *vm, vlib_buffer_t *b,
113 ip4_address_t *src, ip4_address_t *dst, int proto,
114 u8 csum_offload, u8 is_df, u8 dscp)
119 ih = vlib_buffer_push_uninit (b, sizeof (ip4_header_t));
121 ih->ip_version_and_header_length = 0x45;
122 ip4_header_set_dscp (ih, dscp);
123 ip4_header_set_ecn (ih, 0);
124 ih->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b));
127 ih->flags_and_fragment_offset = is_df ? clib_host_to_net_u16 (IP_DF) : 0;
129 ih->protocol = proto;
130 ih->src_address.as_u32 = src->as_u32;
131 ih->dst_address.as_u32 = dst->as_u32;
133 vnet_buffer (b)->l3_hdr_offset = (u8 *) ih - b->data;
134 b->flags |= VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_L3_HDR_OFFSET_VALID;
136 /* Offload ip4 header checksum generation */
140 vnet_buffer_offload_flags_set (b, VNET_BUFFER_OFFLOAD_F_IP_CKSUM);
143 ih->checksum = ip4_header_checksum (ih);
149 * Push IPv4 header to buffer
151 * This does not support fragmentation.
153 * @param vm - vlib_main
154 * @param b - buffer to write the header to
155 * @param src - source IP
156 * @param dst - destination IP
157 * @param prot - payload proto
159 * @return - pointer to start of IP header
162 vlib_buffer_push_ip4 (vlib_main_t * vm, vlib_buffer_t * b,
163 ip4_address_t * src, ip4_address_t * dst, int proto,
166 return vlib_buffer_push_ip4_custom (vm, b, src, dst, proto, csum_offload,
170 #endif /* included_ip_ip4_inlines_h */
173 * fd.io coding-style-patch-verification: ON
176 * eval: (c-set-style "gnu")