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#include <nft.h>
#include <stddef.h>
#include <datatype.h>
#include <dccpopt.h>
#include <expression.h>
#include <nftables.h>
#include <utils.h>
#define PHT(__token, __offset, __len) \
PROTO_HDR_TEMPLATE(__token, &integer_type, BYTEORDER_BIG_ENDIAN, \
__offset, __len)
static const struct proto_hdr_template dccpopt_unknown_template =
PROTO_HDR_TEMPLATE("unknown", &invalid_type, BYTEORDER_INVALID, 0, 0);
/*
* Option DCCP- Section
* Type Length Meaning Data? Reference
* ---- ------ ------- ----- ---------
* 0 1 Padding Y 5.8.1
* 1 1 Mandatory N 5.8.2
* 2 1 Slow Receiver Y 11.6
* 3-31 1 Reserved
* 32 variable Change L N 6.1
* 33 variable Confirm L N 6.2
* 34 variable Change R N 6.1
* 35 variable Confirm R N 6.2
* 36 variable Init Cookie N 8.1.4
* 37 3-8 NDP Count Y 7.7
* 38 variable Ack Vector [Nonce 0] N 11.4
* 39 variable Ack Vector [Nonce 1] N 11.4
* 40 variable Data Dropped N 11.7
* 41 6 Timestamp Y 13.1
* 42 6/8/10 Timestamp Echo Y 13.3
* 43 4/6 Elapsed Time N 13.2
* 44 6 Data Checksum Y 9.3
* 45-127 variable Reserved
* 128-255 variable CCID-specific options - 10.3
*/
static const struct exthdr_desc dccpopt_padding = {
.name = "padding",
.type = DCCPOPT_PADDING,
.templates = {
[DCCPOPT_FIELD_TYPE] = PHT("type", 0, 8),
},
};
static const struct exthdr_desc dccpopt_mandatory = {
.name = "mandatory",
.type = DCCPOPT_MANDATORY,
.templates = {
[DCCPOPT_FIELD_TYPE] = PHT("type", 0, 8),
},
};
static const struct exthdr_desc dccpopt_slow_receiver = {
.name = "slow_receiver",
.type = DCCPOPT_SLOW_RECEIVER,
.templates = {
[DCCPOPT_FIELD_TYPE] = PHT("type", 0, 8),
},
};
static const struct exthdr_desc dccpopt_reserved_short = {
.name = "reserved_short",
.type = DCCPOPT_RESERVED_SHORT,
.templates = {
[DCCPOPT_FIELD_TYPE] = PHT("type", 0, 8),
},
};
static const struct exthdr_desc dccpopt_change_l = {
.name = "change_l",
.type = DCCPOPT_CHANGE_L,
.templates = {
[DCCPOPT_FIELD_TYPE] = PHT("type", 0, 8)
},
};
static const struct exthdr_desc dccpopt_confirm_l = {
.name = "confirm_l",
.type = DCCPOPT_CONFIRM_L,
.templates = {
[DCCPOPT_FIELD_TYPE] = PHT("type", 0, 8),
},
};
static const struct exthdr_desc dccpopt_change_r = {
.name = "change_r",
.type = DCCPOPT_CHANGE_R,
.templates = {
[DCCPOPT_FIELD_TYPE] = PHT("type", 0, 8),
},
};
static const struct exthdr_desc dccpopt_confirm_r = {
.name = "confirm_r",
.type = DCCPOPT_CONFIRM_R,
.templates = {
[DCCPOPT_FIELD_TYPE] = PHT("type", 0, 8),
},
};
static const struct exthdr_desc dccpopt_init_cookie = {
.name = "init_cookie",
.type = DCCPOPT_INIT_COOKIE,
.templates = {
[DCCPOPT_FIELD_TYPE] = PHT("type", 0, 8),
},
};
static const struct exthdr_desc dccpopt_ndp_count = {
.name = "ndp_count",
.type = DCCPOPT_NDP_COUNT,
.templates = {
[DCCPOPT_FIELD_TYPE] = PHT("type", 0, 8),
},
};
static const struct exthdr_desc dccpopt_ack_vector_nonce_0 = {
.name = "ack_vector_nonce_0",
.type = DCCPOPT_ACK_VECTOR_NONCE_0,
.templates = {
[DCCPOPT_FIELD_TYPE] = PHT("type", 0, 8),
},
};
static const struct exthdr_desc dccpopt_ack_vector_nonce_1 = {
.name = "ack_vector_nonce_1",
.type = DCCPOPT_ACK_VECTOR_NONCE_1,
.templates = {
[DCCPOPT_FIELD_TYPE] = PHT("type", 0, 8),
},
};
static const struct exthdr_desc dccpopt_data_dropped = {
.name = "data_dropped",
.type = DCCPOPT_DATA_DROPPED,
.templates = {
[DCCPOPT_FIELD_TYPE] = PHT("type", 0, 8),
},
};
static const struct exthdr_desc dccpopt_timestamp = {
.name = "timestamp",
.type = DCCPOPT_TIMESTAMP,
.templates = {
[DCCPOPT_FIELD_TYPE] = PHT("type", 0, 8),
},
};
static const struct exthdr_desc dccpopt_timestamp_echo = {
.name = "timestamp_echo",
.type = DCCPOPT_TIMESTAMP_ECHO,
.templates = {
[DCCPOPT_FIELD_TYPE] = PHT("type", 0, 8),
},
};
static const struct exthdr_desc dccpopt_elapsed_time = {
.name = "elapsed_time",
.type = DCCPOPT_ELAPSED_TIME,
.templates = {
[DCCPOPT_FIELD_TYPE] = PHT("type", 0, 8),
},
};
static const struct exthdr_desc dccpopt_data_checksum = {
.name = "data_checksum",
.type = DCCPOPT_DATA_CHECKSUM,
.templates = {
[DCCPOPT_FIELD_TYPE] = PHT("type", 0, 8),
},
};
static const struct exthdr_desc dccpopt_reserved_long = {
.name = "reserved_long",
.type = DCCPOPT_RESERVED_LONG,
.templates = {
[DCCPOPT_FIELD_TYPE] = PHT("type", 0, 8),
},
};
static const struct exthdr_desc dccpopt_ccid_specific = {
.name = "ccid_specific",
.type = DCCPOPT_CCID_SPECIFIC,
.templates = {
[DCCPOPT_FIELD_TYPE] = PHT("type", 0, 8),
},
};
const struct exthdr_desc *dccpopt_protocols[1 + UINT8_MAX] = {
[DCCPOPT_PADDING] = &dccpopt_padding,
[DCCPOPT_MANDATORY] = &dccpopt_mandatory,
[DCCPOPT_SLOW_RECEIVER] = &dccpopt_slow_receiver,
[DCCPOPT_RESERVED_SHORT] = &dccpopt_reserved_short,
[DCCPOPT_CHANGE_L] = &dccpopt_change_l,
[DCCPOPT_CONFIRM_L] = &dccpopt_confirm_l,
[DCCPOPT_CHANGE_R] = &dccpopt_change_r,
[DCCPOPT_CONFIRM_R] = &dccpopt_confirm_r,
[DCCPOPT_INIT_COOKIE] = &dccpopt_init_cookie,
[DCCPOPT_NDP_COUNT] = &dccpopt_ndp_count,
[DCCPOPT_ACK_VECTOR_NONCE_0] = &dccpopt_ack_vector_nonce_0,
[DCCPOPT_ACK_VECTOR_NONCE_1] = &dccpopt_ack_vector_nonce_1,
[DCCPOPT_DATA_DROPPED] = &dccpopt_data_dropped,
[DCCPOPT_TIMESTAMP] = &dccpopt_timestamp,
[DCCPOPT_TIMESTAMP_ECHO] = &dccpopt_timestamp_echo,
[DCCPOPT_ELAPSED_TIME] = &dccpopt_elapsed_time,
[DCCPOPT_DATA_CHECKSUM] = &dccpopt_data_checksum,
[DCCPOPT_RESERVED_LONG] = &dccpopt_reserved_long,
[DCCPOPT_CCID_SPECIFIC] = &dccpopt_ccid_specific,
};
const struct exthdr_desc *
dccpopt_find_desc(uint8_t type)
{
enum dccpopt_types proto_idx =
3 <= type && type <= 31 ? DCCPOPT_RESERVED_SHORT :
45 <= type && type <= 127 ? DCCPOPT_RESERVED_LONG :
128 <= type ? DCCPOPT_CCID_SPECIFIC : type;
return dccpopt_protocols[proto_idx];
}
struct expr *
dccpopt_expr_alloc(const struct location *loc, uint8_t type)
{
const struct proto_hdr_template *tmpl;
const struct exthdr_desc *desc;
struct expr *expr;
desc = dccpopt_find_desc(type);
tmpl = &desc->templates[DCCPOPT_FIELD_TYPE];
expr = expr_alloc(loc, EXPR_EXTHDR, tmpl->dtype,
BYTEORDER_BIG_ENDIAN, BITS_PER_BYTE);
expr->exthdr.desc = desc;
expr->exthdr.tmpl = tmpl;
expr->exthdr.offset = tmpl->offset;
expr->exthdr.raw_type = type;
expr->exthdr.flags = NFT_EXTHDR_F_PRESENT;
expr->exthdr.op = NFT_EXTHDR_OP_DCCP;
return expr;
}
void
dccpopt_init_raw(struct expr *expr, uint8_t type, unsigned int offset,
unsigned int len)
{
const struct proto_hdr_template *tmpl;
const struct exthdr_desc *desc;
assert(expr->etype == EXPR_EXTHDR);
desc = dccpopt_find_desc(type);
tmpl = &desc->templates[DCCPOPT_FIELD_TYPE];
expr->len = len;
datatype_set(expr, &boolean_type);
expr->exthdr.offset = offset;
expr->exthdr.desc = desc;
expr->exthdr.flags = NFT_EXTHDR_F_PRESENT;
expr->exthdr.op = NFT_EXTHDR_OP_DCCP;
/* Make sure that it's the right template based on offset and
* len
*/
if (tmpl->offset != offset || tmpl->len != len)
expr->exthdr.tmpl = &dccpopt_unknown_template;
else
expr->exthdr.tmpl = tmpl;
}
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