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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;
/**
* The set of RFC defined DSCP values.
*/
#define foreach_ip_dscp \
_(0, CS0) \
_(8, CS1) \
_(10, AF11) \
_(12, AF12) \
_(14, AF13) \
_(16, CS2) \
_(18, AF21) \
_(20, AF22) \
_(22, AF23) \
_(24, CS3) \
_(26, AF31) \
_(28, AF32) \
_(30, AF33) \
_(32, CS4) \
_(34, AF41) \
_(36, AF42) \
_(38, AF43) \
_(40, CS5) \
_(46, EF) \
_(48, CS6) \
_(50, CS7)
typedef enum ip_dscp_t_
{
#define _(n,f) IP_DSCP_##f = n,
foreach_ip_dscp
#undef _
} __clib_packed ip_dscp_t;
extern u8 *format_ip_dscp (u8 * s, va_list * va);
/**
* IP DSCP bit shift
* The ECN occupies the 2 least significant bits of the TC field
*/
#define IP_PACKET_TC_FIELD_DSCP_BIT_SHIFT 2
#define IP_PACKET_TC_FIELD_ECN_MASK 0x03
/**
* The set of RFC defined DSCP values.
*/
#define foreach_ip_ecn \
_(0, NON_ECN) \
_(1, ECT_0) \
_(2, ECT_1) \
_(3, CE)
typedef enum ip_ecn_t_
{
#define _(n,f) IP_ECN_##f = n,
foreach_ip_ecn
#undef _
} __clib_packed ip_ecn_t;
STATIC_ASSERT_SIZEOF (ip_ecn_t, 1);
extern u8 *format_ip_ecn (u8 * s, va_list * va);
/* IP checksum support. */
static_always_inline u16
ip_csum (void *data, u16 n_left)
{
u32 sum;
#ifdef CLIB_HAVE_VEC256
u16x16 v1, v2;
u32x8 zero = { 0 };
u32x8 sum8 = { 0 };
u32x4 sum4;
#endif
/* if there is odd number of bytes, pad by zero and store in sum */
sum = (n_left & 1) ? ((u8 *) data)[n_left - 1] << 8 : 0;
/* we deal with words */
n_left >>= 1;
#ifdef CLIB_HAVE_VEC256
while (n_left >= 32)
{
v1 = u16x16_load_unaligned (data);
v2 = u16x16_load_unaligned (data + 32);
#ifdef CLIB_ARCH_IS_LITTLE_ENDIAN
v1 = u16x16_byte_swap (v1);
v2 = u16x16_byte_swap (v2);
#endif
sum8 += u16x8_extend_to_u32x8 (u16x16_extract_lo (v1));
sum8 += u16x8_extend_to_u32x8 (u16x16_extract_hi (v1));
sum8 += u16x8_extend_to_u32x8 (u16x16_extract_lo (v2));
sum8 += u16x8_extend_to_u32x8 (u16x16_extract_hi (v2));
n_left -= 32;
data += 64;
}
if (n_left >= 16)
{
v1 = u16x16_load_unaligned (data);
#ifdef CLIB_ARCH_IS_LITTLE_ENDIAN
v1 = u16x16_byte_swap (v1);
#endif
v1 = u16x16_byte_swap (u16x16_load_unaligned (data));
sum8 += u16x8_extend_to_u32x8 (u16x16_extract_lo (v1));
sum8 += u16x8_extend_to_u32x8 (u16x16_extract_hi (v1));
n_left -= 16;
data += 32;
}
if (n_left)
{
v1 = u16x16_load_unaligned (data);
#ifdef CLIB_ARCH_IS_LITTLE_ENDIAN
v1 = u16x16_byte_swap (v1);
#endif
v1 = u16x16_mask_last (v1, 16 - n_left);
sum8 += u16x8_extend_to_u32x8 (u16x16_extract_lo (v1));
sum8 += u16x8_extend_to_u32x8 (u16x16_extract_hi (v1));
}
sum8 = u32x8_hadd (sum8, zero);
sum4 = u32x8_extract_lo (sum8) + u32x8_extract_hi (sum8);
sum = sum4[0] + sum4[1];
#else
/* scalar version */
while (n_left >= 8)
{
sum += clib_net_to_host_u16 (*((u16 *) data + 0));
sum += clib_net_to_host_u16 (*((u16 *) data + 1));
sum += clib_net_to_host_u16 (*((u16 *) data + 2));
sum += clib_net_to_host_u16 (*((u16 *) data + 3));
sum += clib_net_to_host_u16 (*((u16 *) data + 4));
sum += clib_net_to_host_u16 (*((u16 *) data + 5));
sum += clib_net_to_host_u16 (*((u16 *) data + 6));
sum += clib_net_to_host_u16 (*((u16 *) data + 7));
n_left -= 8;
data += 16;
}
while (n_left)
{
sum += clib_net_to_host_u16 (*(u16 *) data);
n_left -= 1;
data += 2;
}
#endif
sum = (sum & 0xffff) + (sum >> 16);
sum = (sum & 0xffff) + (sum >> 16);
return ~((u16) sum);
}
/* 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;
ip_csum_t t = ip_csum_with_carry (d, x);
ASSERT ((t - c == 0) || (t - c == ~0));
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);
/* Checksum routine. */
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);
}
#endif /* included_ip_packet_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
