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/*
* Copyright (c) 2016 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/ip6.h: ip6 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_ip6_inlines_h
#define included_ip_ip6_inlines_h
#include <vnet/ip/ip6_packet.h>
#include <vnet/ip/ip6_hop_by_hop_packet.h>
/* Compute flow hash. We'll use it to select which Sponge to use for this
flow. And other things. */
always_inline u32
ip6_compute_flow_hash (const ip6_header_t * ip,
flow_hash_config_t flow_hash_config)
{
tcp_header_t *tcp;
u64 a, b, c;
u64 t1, t2;
uword is_tcp_udp = 0;
u8 protocol = ip->protocol;
if (PREDICT_TRUE
((ip->protocol == IP_PROTOCOL_TCP)
|| (ip->protocol == IP_PROTOCOL_UDP)))
{
is_tcp_udp = 1;
tcp = (void *) (ip + 1);
}
else if (ip->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS)
{
ip6_hop_by_hop_header_t *hbh = (ip6_hop_by_hop_header_t *) (ip + 1);
if ((hbh->protocol == IP_PROTOCOL_TCP) ||
(hbh->protocol == IP_PROTOCOL_UDP))
{
is_tcp_udp = 1;
tcp = (tcp_header_t *) ((u8 *) hbh + ((hbh->length + 1) << 3));
}
protocol = hbh->protocol;
}
t1 = (ip->src_address.as_u64[0] ^ ip->src_address.as_u64[1]);
t1 = (flow_hash_config & IP_FLOW_HASH_SRC_ADDR) ? t1 : 0;
t2 = (ip->dst_address.as_u64[0] ^ ip->dst_address.as_u64[1]);
t2 = (flow_hash_config & IP_FLOW_HASH_DST_ADDR) ? t2 : 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) ? protocol : 0;
c = ((flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? ((t1 << 16) | t2) :
((t2 << 16) | t1));
t1 = ((u64) ip_flow_hash_router_id << 32);
t1 |=
((flow_hash_config & IP_FLOW_HASH_FL) ? ip6_flow_label_network_order (ip) :
0);
c ^= t1;
hash_mix64 (a, b, c);
return (u32) c;
}
/* ip6_locate_header
*
* This function is to search for the header specified by the protocol number
* in find_hdr_type.
* This is used to locate a specific IPv6 extension header
* or to find transport layer header.
* 1. If the find_hdr_type < 0 then it finds and returns the protocol number and
* offset stored in *offset of the transport or ESP header in the chain if
* found.
* 2. If a header with find_hdr_type > 0 protocol number is found then the
* offset is stored in *offset and protocol number of the header is
* returned.
* 3. If find_hdr_type is not found or packet is malformed or
* it is a non-first fragment -1 is returned.
*/
always_inline int
ip6_locate_header (vlib_buffer_t *b, ip6_header_t *ip, int find_hdr_type,
u32 *offset)
{
ip6_ext_hdr_chain_t hdr_chain;
int res = ip6_ext_header_walk (b, ip, find_hdr_type, &hdr_chain);
if (res >= 0)
{
*offset = hdr_chain.eh[res].offset;
return hdr_chain.eh[res].protocol;
}
return -1;
}
/**
* Push IPv6 header to buffer
*
* @param vm - vlib_main
* @param b - buffer to write the header to
* @param src - source IP
* @param dst - destination IP
* @param prot - payload proto
* @param flow_label - flow label
*
* @return - pointer to start of IP header
*/
always_inline void *
vlib_buffer_push_ip6_custom (vlib_main_t * vm, vlib_buffer_t * b,
ip6_address_t * src, ip6_address_t * dst,
int proto, u32 flow_label)
{
ip6_header_t *ip6h;
u16 payload_length;
/* make some room */
ip6h = vlib_buffer_push_uninit (b, sizeof (ip6_header_t));
ASSERT (flow_label < 1 << 20);
ip6h->ip_version_traffic_class_and_flow_label =
clib_host_to_net_u32 ((0x6 << 28) | flow_label);
/* calculate ip6 payload length */
payload_length = vlib_buffer_length_in_chain (vm, b);
payload_length -= sizeof (*ip6h);
ip6h->payload_length = clib_host_to_net_u16 (payload_length);
ip6h->hop_limit = 0xff;
ip6h->protocol = proto;
clib_memcpy_fast (ip6h->src_address.as_u8, src->as_u8,
sizeof (ip6h->src_address));
clib_memcpy_fast (ip6h->dst_address.as_u8, dst->as_u8,
sizeof (ip6h->src_address));
vnet_buffer (b)->l3_hdr_offset = (u8 *) ip6h - b->data;
b->flags |= VNET_BUFFER_F_IS_IP6 | VNET_BUFFER_F_L3_HDR_OFFSET_VALID;
return ip6h;
}
/**
* Push IPv6 header to buffer
*
* @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_ip6 (vlib_main_t * vm, vlib_buffer_t * b,
ip6_address_t * src, ip6_address_t * dst, int proto)
{
return vlib_buffer_push_ip6_custom (vm, b, src, dst, proto,
0 /* flow label */ );
}
#endif /* included_ip_ip6_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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