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/*
* Copyright (c) 2015 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.
*/
/*
* ip/ip4.h: ip4 main include file
*
* Copyright (c) 2008 Eliot Dresselhaus
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef included_ip_ip4_inlines_h
#define included_ip_ip4_inlines_h
#include <vnet/ip/ip_flow_hash.h>
#include <vnet/ip/ip4_packet.h>
#define IP_DF 0x4000 /* don't fragment */
/* Compute flow hash. We'll use it to select which adjacency to use for this
flow. And other things. */
always_inline u32
ip4_compute_flow_hash (const ip4_header_t * ip,
flow_hash_config_t flow_hash_config)
{
tcp_header_t *tcp = (void *) (ip + 1);
u32 a, b, c, t1, t2;
uword is_tcp_udp = (ip->protocol == IP_PROTOCOL_TCP
|| ip->protocol == IP_PROTOCOL_UDP);
t1 = (flow_hash_config & IP_FLOW_HASH_SRC_ADDR)
? ip->src_address.data_u32 : 0;
t2 = (flow_hash_config & IP_FLOW_HASH_DST_ADDR)
? ip->dst_address.data_u32 : 0;
a = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t2 : t1;
b = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t1 : t2;
t1 = is_tcp_udp ? tcp->src : 0;
t2 = is_tcp_udp ? tcp->dst : 0;
t1 = (flow_hash_config & IP_FLOW_HASH_SRC_PORT) ? t1 : 0;
t2 = (flow_hash_config & IP_FLOW_HASH_DST_PORT) ? t2 : 0;
if (flow_hash_config & IP_FLOW_HASH_SYMMETRIC)
{
if (b < a)
{
c = a;
a = b;
b = c;
}
if (t2 < t1)
{
t2 += t1;
t1 = t2 - t1;
t2 = t2 - t1;
}
}
b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? ip->protocol : 0;
c = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ?
(t1 << 16) | t2 : (t2 << 16) | t1;
a ^= ip_flow_hash_router_id;
hash_v3_mix32 (a, b, c);
hash_v3_finalize32 (a, b, c);
return c;
}
always_inline void *
vlib_buffer_push_ip4_custom (vlib_main_t * vm, vlib_buffer_t * b,
ip4_address_t * src, ip4_address_t * dst,
int proto, u8 csum_offload, u8 is_df)
{
ip4_header_t *ih;
/* make some room */
ih = vlib_buffer_push_uninit (b, sizeof (ip4_header_t));
ih->ip_version_and_header_length = 0x45;
ih->tos = 0;
ih->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b));
/* No fragments */
ih->flags_and_fragment_offset = is_df ? clib_host_to_net_u16 (IP_DF) : 0;
ih->ttl = 255;
ih->protocol = proto;
ih->src_address.as_u32 = src->as_u32;
ih->dst_address.as_u32 = dst->as_u32;
vnet_buffer (b)->l3_hdr_offset = (u8 *) ih - b->data;
b->flags |= VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_L3_HDR_OFFSET_VALID;
/* Offload ip4 header checksum generation */
if (csum_offload)
{
ih->checksum = 0;
b->flags |= VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
}
else
ih->checksum = ip4_header_checksum (ih);
return ih;
}
/**
* Push IPv4 header to buffer
*
* This does not support fragmentation.
*
* @param vm - vlib_main
* @param b - buffer to write the header to
* @param src - source IP
* @param dst - destination IP
* @param prot - payload proto
*
* @return - pointer to start of IP header
*/
always_inline void *
vlib_buffer_push_ip4 (vlib_main_t * vm, vlib_buffer_t * b,
ip4_address_t * src, ip4_address_t * dst, int proto,
u8 csum_offload)
{
return vlib_buffer_push_ip4_custom (vm, b, src, dst, proto, csum_offload,
1 /* is_df */ );
}
#endif /* included_ip_ip4_inlines_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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