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Diffstat (limited to 'src/vnet/pg/edit.h')
| -rw-r--r-- | src/vnet/pg/edit.h | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/src/vnet/pg/edit.h b/src/vnet/pg/edit.h new file mode 100644 index 00000000..3bfdad57 --- /dev/null +++ b/src/vnet/pg/edit.h @@ -0,0 +1,210 @@ +/* + * 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. + */ +/* + * pg_edit.h: packet generator edits + * + * 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_packet_generator_pg_edit_h +#define included_packet_generator_pg_edit_h + +#include <vppinfra/format.h> +#include <vppinfra/vec.h> + +typedef enum +{ + /* Invalid type used to poison edits. */ + PG_EDIT_INVALID_TYPE, + + /* Value is fixed: does not change for all packets in sequence. */ + PG_EDIT_FIXED, + + /* Value v increments between low and high values v_low <= v <= v_high. */ + PG_EDIT_INCREMENT, + + /* Random value between low and high values v_low <= v <= v_high. */ + PG_EDIT_RANDOM, + + /* Unspecified value; will be specified by some edit function. */ + PG_EDIT_UNSPECIFIED, +} pg_edit_type_t; + +typedef struct +{ + pg_edit_type_t type; + + /* Bit offset within packet where value is to be written. + Bits are written in network byte order: high bits first. + This is the bit offset of the least significant bit: i.e. the + highest numbered byte * 8 plus bit offset within that byte. + Negative offsets encode special edits. */ + i32 lsb_bit_offset; + + /* Special offset indicating this edit is for packet length. */ +#define PG_EDIT_PACKET_LENGTH (-1) + + /* Number of bits in edit. */ + u32 n_bits; + + /* Low and high values for this edit. Network byte order. */ + u8 *values[2]; +#define PG_EDIT_LO 0 +#define PG_EDIT_HI 1 + + /* Last value used for increment edit type. */ + u64 last_increment_value; +} pg_edit_t; + +always_inline void +pg_edit_free (pg_edit_t * e) +{ + int i; + for (i = 0; i < ARRAY_LEN (e->values); i++) + vec_free (e->values[i]); +} + +#define pg_edit_init_bitfield(e,type,field,field_offset,field_n_bits) \ +do { \ + u32 _bo; \ + \ + ASSERT ((field_offset) < STRUCT_BITS_OF (type, field)); \ + \ + /* Start byte offset. */ \ + _bo = STRUCT_OFFSET_OF (type, field); \ + \ + /* Adjust for big endian byte order. */ \ + _bo += ((STRUCT_BITS_OF (type, field) \ + - (field_offset) - 1) / BITS (u8)); \ + \ + (e)->lsb_bit_offset = _bo * BITS (u8) + ((field_offset) % BITS (u8)); \ + (e)->n_bits = (field_n_bits); \ +} while (0) + +/* Initialize edit for byte aligned fields. */ +#define pg_edit_init(e,type,field) \ + pg_edit_init_bitfield(e,type,field,0,STRUCT_BITS_OF(type,field)) + +static inline uword +pg_edit_n_alloc_bytes (pg_edit_t * e) +{ + int i0, i1, n_bytes, n_bits_left; + + i0 = e->lsb_bit_offset; + i1 = i0 % BITS (u8); + + n_bytes = 0; + n_bits_left = e->n_bits; + + if (n_bits_left > 0 && i1 != 0) + { + n_bytes++; + n_bits_left -= i1; + if (n_bits_left < 0) + n_bits_left = 0; + } + + n_bytes += (n_bits_left / BITS (u8)); + n_bytes += (n_bits_left % BITS (u8)) != 0; + + return n_bytes; +} + +static inline void +pg_edit_alloc_value (pg_edit_t * e, int i) +{ + vec_validate (e->values[i], e->lsb_bit_offset / BITS (u8)); +} + +extern void pg_edit_set_value (pg_edit_t * e, int hi_or_lo, u64 value); + +static inline void +pg_edit_set_fixed (pg_edit_t * e, u64 value) +{ + e->type = PG_EDIT_FIXED; + pg_edit_set_value (e, PG_EDIT_LO, value); +} + +static inline void +pg_edit_copy_type_and_values (pg_edit_t * dst, pg_edit_t * src) +{ + int i; + dst->type = src->type; + src->type = PG_EDIT_INVALID_TYPE; + for (i = 0; i < ARRAY_LEN (dst->values); i++) + { + dst->values[i] = src->values[i]; + src->values[i] = 0; + } +} + +static inline u64 +pg_edit_get_value (pg_edit_t * e, int hi_or_lo) +{ + u64 r = 0; + int i, n; + u8 *v = e->values[hi_or_lo]; + + n = round_pow2 (e->n_bits, BITS (u8)) / BITS (u8); + + ASSERT (n <= vec_len (v)); + ASSERT (n <= sizeof (r)); + + for (i = 0; i < n; i++) + r = (r << BITS (v[i])) + v[i]; + + return r; +} + +static inline uword +pg_edit_is_fixed_with_value (pg_edit_t * e, u64 value) +{ + return (e->type == PG_EDIT_FIXED + && value == pg_edit_get_value (e, PG_EDIT_LO)); +} + +uword unformat_pg_edit (unformat_input_t * input, va_list * args); +uword unformat_pg_payload (unformat_input_t * input, va_list * args); +uword unformat_pg_number (unformat_input_t * input, va_list * args); +uword unformat_pg_interface (unformat_input_t * input, va_list * args); + +#endif /* included_packet_generator_pg_edit_h */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |