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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/ip_packet.h: packet format common between ip4 & ip6
*
* 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_packet_h
#define included_ip_packet_h
#include <vppinfra/byte_order.h>
#include <vppinfra/error.h>
typedef enum ip_protocol
{
#define ip_protocol(n,s) IP_PROTOCOL_##s = n,
#include "protocols.def"
#undef ip_protocol
} ip_protocol_t;
/* TCP/UDP ports. */
typedef enum
{
#define ip_port(s,n) IP_PORT_##s = n,
#include "ports.def"
#undef ip_port
} ip_port_t;
/* Classifies protocols into UDP, ICMP or other. */
typedef enum
{
IP_BUILTIN_PROTOCOL_UDP,
IP_BUILTIN_PROTOCOL_ICMP,
IP_BUILTIN_PROTOCOL_UNKNOWN,
} ip_builtin_protocol_t;
#define foreach_ip_builtin_multicast_group \
_ (1, all_hosts_on_subnet) \
_ (2, all_routers_on_subnet) \
_ (4, dvmrp) \
_ (5, ospf_all_routers) \
_ (6, ospf_designated_routers) \
_ (13, pim) \
_ (18, vrrp) \
_ (102, hsrp) \
_ (22, igmp_v3)
typedef enum
{
#define _(n,f) IP_MULTICAST_GROUP_##f = n,
foreach_ip_builtin_multicast_group
#undef _
} ip_multicast_group_t;
/* IP checksum support. */
/* Incremental checksum update. */
typedef uword ip_csum_t;
always_inline ip_csum_t
ip_csum_with_carry (ip_csum_t sum, ip_csum_t x)
{
ip_csum_t t = sum + x;
return t + (t < x);
}
/* Update checksum changing field at even byte offset from x -> 0. */
always_inline ip_csum_t
ip_csum_add_even (ip_csum_t c, ip_csum_t x)
{
ip_csum_t d;
d = c - x;
/* Fold in carry from high bit. */
d -= d > c;
ASSERT (ip_csum_with_carry (d, x) == c);
return d;
}
/* Update checksum changing field at even byte offset from 0 -> x. */
always_inline ip_csum_t
ip_csum_sub_even (ip_csum_t c, ip_csum_t x)
{
return ip_csum_with_carry (c, x);
}
always_inline ip_csum_t
ip_csum_update_inline (ip_csum_t sum, ip_csum_t old, ip_csum_t new,
u32 field_byte_offset, u32 field_n_bytes)
{
/* For even 1-byte fields on big-endian and odd 1-byte fields on little endian
we need to shift byte into place for checksum. */
if ((field_n_bytes % 2)
&& (field_byte_offset % 2) == CLIB_ARCH_IS_LITTLE_ENDIAN)
{
old = old << 8;
new = new << 8;
}
sum = ip_csum_sub_even (sum, old);
sum = ip_csum_add_even (sum, new);
return sum;
}
#define ip_csum_update(sum,old,new,type,field) \
ip_csum_update_inline ((sum), (old), (new), \
STRUCT_OFFSET_OF (type, field), \
STRUCT_SIZE_OF (type, field))
always_inline u16
ip_csum_fold (ip_csum_t c)
{
/* Reduce to 16 bits. */
#if uword_bits == 64
c = (c & (ip_csum_t) 0xffffffff) + (c >> (ip_csum_t) 32);
c = (c & 0xffff) + (c >> 16);
#endif
c = (c & 0xffff) + (c >> 16);
c = (c & 0xffff) + (c >> 16);
return c;
}
extern ip_csum_t (*vnet_incremental_checksum_fp) (ip_csum_t, void *, uword);
always_inline ip_csum_t
ip_incremental_checksum (ip_csum_t sum, void *_data, uword n_bytes)
{
return (*vnet_incremental_checksum_fp) (sum, _data, n_bytes);
}
always_inline u16
ip_csum_and_memcpy_fold (ip_csum_t sum, void *dst)
{
return ip_csum_fold (sum);
}
/* Checksum routine. */
ip_csum_t ip_incremental_checksum (ip_csum_t sum, void *data, uword n_bytes);
#endif /* included_ip_packet_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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