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/*
* Conntrack expression related definitions and types.
*
* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Development of this code funded by Astaro AG (http://www.astaro.com/)
*/
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <inttypes.h>
#include <string.h>
#include <linux/netfilter/nf_tables.h>
#include <linux/netfilter/nf_conntrack_common.h>
#include <linux/netfilter/nf_conntrack_tuple_common.h>
#include <errno.h>
#include <erec.h>
#include <expression.h>
#include <datatype.h>
#include <gmputil.h>
#include <ct.h>
#include <gmputil.h>
#include <utils.h>
#include <statement.h>
#define CONNLABEL_CONF DEFAULT_INCLUDE_PATH "/connlabel.conf"
static const struct symbol_table ct_state_tbl = {
.base = BASE_HEXADECIMAL,
.symbols = {
SYMBOL("invalid", NF_CT_STATE_INVALID_BIT),
SYMBOL("new", NF_CT_STATE_BIT(IP_CT_NEW)),
SYMBOL("established", NF_CT_STATE_BIT(IP_CT_ESTABLISHED)),
SYMBOL("related", NF_CT_STATE_BIT(IP_CT_RELATED)),
SYMBOL("untracked", NF_CT_STATE_UNTRACKED_BIT),
SYMBOL_LIST_END
}
};
static const struct datatype ct_state_type = {
.type = TYPE_CT_STATE,
.name = "ct_state",
.desc = "conntrack state",
.byteorder = BYTEORDER_HOST_ENDIAN,
.size = 4 * BITS_PER_BYTE,
.basetype = &bitmask_type,
.sym_tbl = &ct_state_tbl,
};
static const struct symbol_table ct_dir_tbl = {
.base = BASE_DECIMAL,
.symbols = {
SYMBOL("original", IP_CT_DIR_ORIGINAL),
SYMBOL("reply", IP_CT_DIR_REPLY),
SYMBOL_LIST_END
}
};
static const struct datatype ct_dir_type = {
.type = TYPE_CT_DIR,
.name = "ct_dir",
.desc = "conntrack direction",
.byteorder = BYTEORDER_INVALID,
.size = BITS_PER_BYTE,
.basetype = &integer_type,
.sym_tbl = &ct_dir_tbl,
};
static const struct symbol_table ct_status_tbl = {
/*
* There are more, but most of them don't make sense for filtering.
*/
.base = BASE_HEXADECIMAL,
.symbols = {
SYMBOL("expected", IPS_EXPECTED),
SYMBOL("seen-reply", IPS_SEEN_REPLY),
SYMBOL("assured", IPS_ASSURED),
SYMBOL("confirmed", IPS_CONFIRMED),
SYMBOL("snat", IPS_SRC_NAT),
SYMBOL("dnat", IPS_DST_NAT),
SYMBOL("dying", IPS_DYING),
SYMBOL_LIST_END
},
};
static const struct datatype ct_status_type = {
.type = TYPE_CT_STATUS,
.name = "ct_status",
.desc = "conntrack status",
.byteorder = BYTEORDER_HOST_ENDIAN,
.size = 4 * BITS_PER_BYTE,
.basetype = &bitmask_type,
.sym_tbl = &ct_status_tbl,
};
static const struct symbol_table ct_events_tbl = {
.base = BASE_HEXADECIMAL,
.symbols = {
SYMBOL("new", 1 << IPCT_NEW),
SYMBOL("related", 1 << IPCT_RELATED),
SYMBOL("destroy", 1 << IPCT_DESTROY),
SYMBOL("reply", 1 << IPCT_REPLY),
SYMBOL("assured", 1 << IPCT_ASSURED),
SYMBOL("protoinfo", 1 << IPCT_PROTOINFO),
SYMBOL("helper", 1 << IPCT_HELPER),
SYMBOL("mark", 1 << IPCT_MARK),
SYMBOL("seqadj", 1 << IPCT_SEQADJ),
SYMBOL("secmark", 1 << IPCT_SECMARK),
SYMBOL("label", 1 << IPCT_LABEL),
SYMBOL_LIST_END
},
};
static const struct datatype ct_event_type = {
.type = TYPE_CT_EVENTBIT,
.name = "ct_event",
.desc = "conntrack event bits",
.byteorder = BYTEORDER_HOST_ENDIAN,
.size = 4 * BITS_PER_BYTE,
.basetype = &bitmask_type,
.sym_tbl = &ct_events_tbl,
};
static struct symbol_table *ct_label_tbl;
#define CT_LABEL_BIT_SIZE 128
static void ct_label_type_print(const struct expr *expr,
struct output_ctx *octx)
{
unsigned long bit = mpz_scan1(expr->value, 0);
const struct symbolic_constant *s;
for (s = ct_label_tbl->symbols; s->identifier != NULL; s++) {
if (bit != s->value)
continue;
printf("\"%s\"", s->identifier);
return;
}
/* can happen when connlabel.conf is altered after rules were added */
printf("%ld\n", (long)mpz_scan1(expr->value, 0));
}
static struct error_record *ct_label_type_parse(const struct expr *sym,
struct expr **res)
{
const struct symbolic_constant *s;
const struct datatype *dtype;
uint8_t data[CT_LABEL_BIT_SIZE];
uint64_t bit;
mpz_t value;
for (s = ct_label_tbl->symbols; s->identifier != NULL; s++) {
if (!strcmp(sym->identifier, s->identifier))
break;
}
dtype = sym->dtype;
if (s->identifier == NULL) {
char *ptr;
errno = 0;
bit = strtoull(sym->identifier, &ptr, 0);
if (*ptr)
return error(&sym->location, "%s: could not parse %s \"%s\"",
CONNLABEL_CONF, dtype->desc, sym->identifier);
if (errno)
return error(&sym->location, "%s: could not parse %s \"%s\": %s",
CONNLABEL_CONF, dtype->desc, sym->identifier, strerror(errno));
} else {
bit = s->value;
}
if (bit >= CT_LABEL_BIT_SIZE)
return error(&sym->location, "%s: bit %" PRIu64 " out of range (%u max)",
sym->identifier, bit, CT_LABEL_BIT_SIZE);
mpz_init2(value, dtype->size);
mpz_setbit(value, bit);
mpz_export_data(data, value, BYTEORDER_HOST_ENDIAN, sizeof(data));
*res = constant_expr_alloc(&sym->location, dtype,
dtype->byteorder, sizeof(data),
data);
mpz_clear(value);
return NULL;
}
static const struct datatype ct_label_type = {
.type = TYPE_CT_LABEL,
.name = "ct_label",
.desc = "conntrack label",
.byteorder = BYTEORDER_HOST_ENDIAN,
.size = CT_LABEL_BIT_SIZE,
.basetype = &bitmask_type,
.print = ct_label_type_print,
.parse = ct_label_type_parse,
};
static void __init ct_label_table_init(void)
{
ct_label_tbl = rt_symbol_table_init(CONNLABEL_CONF);
}
static void __exit ct_label_table_exit(void)
{
rt_symbol_table_free(ct_label_tbl);
}
#ifndef NF_CT_HELPER_NAME_LEN
#define NF_CT_HELPER_NAME_LEN 16
#endif
static const struct ct_template ct_templates[] = {
[NFT_CT_STATE] = CT_TEMPLATE("state", &ct_state_type,
BYTEORDER_HOST_ENDIAN,
4 * BITS_PER_BYTE),
[NFT_CT_DIRECTION] = CT_TEMPLATE("direction", &ct_dir_type,
BYTEORDER_HOST_ENDIAN,
BITS_PER_BYTE),
[NFT_CT_STATUS] = CT_TEMPLATE("status", &ct_status_type,
BYTEORDER_HOST_ENDIAN,
4 * BITS_PER_BYTE),
[NFT_CT_MARK] = CT_TEMPLATE("mark", &mark_type,
BYTEORDER_HOST_ENDIAN,
4 * BITS_PER_BYTE),
[NFT_CT_EXPIRATION] = CT_TEMPLATE("expiration", &time_type,
BYTEORDER_HOST_ENDIAN,
4 * BITS_PER_BYTE),
[NFT_CT_HELPER] = CT_TEMPLATE("helper", &string_type,
BYTEORDER_HOST_ENDIAN,
NF_CT_HELPER_NAME_LEN * BITS_PER_BYTE),
[NFT_CT_L3PROTOCOL] = CT_TEMPLATE("l3proto", &nfproto_type,
BYTEORDER_HOST_ENDIAN,
BITS_PER_BYTE),
[NFT_CT_SRC] = CT_TEMPLATE("saddr", &invalid_type,
BYTEORDER_BIG_ENDIAN, 0),
[NFT_CT_DST] = CT_TEMPLATE("daddr", &invalid_type,
BYTEORDER_BIG_ENDIAN, 0),
[NFT_CT_PROTOCOL] = CT_TEMPLATE("protocol", &inet_protocol_type,
BYTEORDER_BIG_ENDIAN,
BITS_PER_BYTE),
[NFT_CT_PROTO_SRC] = CT_TEMPLATE("proto-src", &invalid_type,
BYTEORDER_BIG_ENDIAN,
2 * BITS_PER_BYTE),
[NFT_CT_PROTO_DST] = CT_TEMPLATE("proto-dst", &invalid_type,
BYTEORDER_BIG_ENDIAN,
2 * BITS_PER_BYTE),
[NFT_CT_LABELS] = CT_TEMPLATE("label", &ct_label_type,
BYTEORDER_HOST_ENDIAN,
CT_LABEL_BIT_SIZE),
[NFT_CT_BYTES] = CT_TEMPLATE("bytes", &integer_type,
BYTEORDER_HOST_ENDIAN, 64),
[NFT_CT_PKTS] = CT_TEMPLATE("packets", &integer_type,
BYTEORDER_HOST_ENDIAN, 64),
[NFT_CT_AVGPKT] = CT_TEMPLATE("avgpkt", &integer_type,
BYTEORDER_HOST_ENDIAN, 64),
[NFT_CT_ZONE] = CT_TEMPLATE("zone", &integer_type,
BYTEORDER_HOST_ENDIAN, 16),
[NFT_CT_EVENTMASK] = CT_TEMPLATE("event", &ct_event_type,
BYTEORDER_HOST_ENDIAN, 32),
};
static void ct_print(enum nft_ct_keys key, int8_t dir)
{
const struct symbolic_constant *s;
printf("ct ");
if (dir < 0)
goto done;
for (s = ct_dir_tbl.symbols; s->identifier != NULL; s++) {
if (dir == (int)s->value) {
printf("%s ", s->identifier);
break;
}
}
done:
printf("%s", ct_templates[key].token);
}
static void ct_expr_print(const struct expr *expr, struct output_ctx *octx)
{
ct_print(expr->ct.key, expr->ct.direction);
}
static bool ct_expr_cmp(const struct expr *e1, const struct expr *e2)
{
if (e1->ct.key != e2->ct.key)
return false;
return e1->ct.direction == e2->ct.direction;
}
static void ct_expr_clone(struct expr *new, const struct expr *expr)
{
new->ct = expr->ct;
}
static void ct_expr_pctx_update(struct proto_ctx *ctx, const struct expr *expr)
{
const struct expr *left = expr->left, *right = expr->right;
const struct proto_desc *base, *desc;
assert(expr->op == OP_EQ);
switch (left->ct.key) {
case NFT_CT_PROTOCOL:
base = ctx->protocol[PROTO_BASE_NETWORK_HDR].desc;
desc = proto_find_upper(base, mpz_get_uint32(right->value));
proto_ctx_update(ctx, PROTO_BASE_TRANSPORT_HDR,
&expr->location, desc);
break;
default:
break;
}
}
static const struct expr_ops ct_expr_ops = {
.type = EXPR_CT,
.name = "ct",
.print = ct_expr_print,
.cmp = ct_expr_cmp,
.clone = ct_expr_clone,
.pctx_update = ct_expr_pctx_update,
};
struct error_record *ct_dir_parse(const struct location *loc, const char *str,
int8_t *direction)
{
const struct symbolic_constant *s;
for (s = ct_dir_tbl.symbols; s->identifier != NULL; s++) {
if (!strcmp(str, s->identifier)) {
*direction = s->value;
return NULL;
}
}
return error(loc, "Could not parse direction %s", str);
}
struct error_record *ct_key_parse(const struct location *loc, const char *str,
unsigned int *key)
{
int ret, len, offset = 0;
const char *sep = "";
unsigned int i;
char buf[1024];
size_t size;
for (i = 0; i < array_size(ct_templates); i++) {
if (!ct_templates[i].token || strcmp(ct_templates[i].token, str))
continue;
*key = i;
return NULL;
}
len = (int)sizeof(buf);
size = sizeof(buf);
for (i = 0; i < array_size(ct_templates); i++) {
if (!ct_templates[i].token)
continue;
if (offset)
sep = ", ";
ret = snprintf(buf+offset, len, "%s%s", sep, ct_templates[i].token);
SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
assert(offset < (int)sizeof(buf));
}
return error(loc, "syntax error, unexpected %s, known keys are %s", str, buf);
}
struct error_record *ct_objtype_parse(const struct location *loc, const char *str, int *type)
{
if (strcmp(str, "helper") == 0) {
*type = NFT_OBJECT_CT_HELPER;
return NULL;
}
return error(loc, "unknown ct class '%s', want 'helper'", str);
}
struct expr *ct_expr_alloc(const struct location *loc, enum nft_ct_keys key,
int8_t direction)
{
const struct ct_template *tmpl = &ct_templates[key];
struct expr *expr;
expr = expr_alloc(loc, &ct_expr_ops, tmpl->dtype,
tmpl->byteorder, tmpl->len);
expr->ct.key = key;
expr->ct.direction = direction;
switch (key) {
case NFT_CT_PROTOCOL:
expr->flags = EXPR_F_PROTOCOL;
break;
default:
break;
}
return expr;
}
void ct_expr_update_type(struct proto_ctx *ctx, struct expr *expr)
{
const struct proto_desc *desc;
switch (expr->ct.key) {
case NFT_CT_SRC:
case NFT_CT_DST:
desc = ctx->protocol[PROTO_BASE_NETWORK_HDR].desc;
if (desc == &proto_ip)
expr->dtype = &ipaddr_type;
else if (desc == &proto_ip6)
expr->dtype = &ip6addr_type;
expr->len = expr->dtype->size;
break;
case NFT_CT_PROTO_SRC:
case NFT_CT_PROTO_DST:
desc = ctx->protocol[PROTO_BASE_TRANSPORT_HDR].desc;
if (desc == NULL)
break;
expr->dtype = &inet_service_type;
break;
default:
break;
}
}
static void ct_stmt_print(const struct stmt *stmt, struct output_ctx *octx)
{
ct_print(stmt->ct.key, stmt->ct.direction);
printf(" set ");
expr_print(stmt->ct.expr, octx);
}
static const struct stmt_ops ct_stmt_ops = {
.type = STMT_CT,
.name = "ct",
.print = ct_stmt_print,
};
struct stmt *ct_stmt_alloc(const struct location *loc, enum nft_ct_keys key,
int8_t direction, struct expr *expr)
{
struct stmt *stmt;
stmt = stmt_alloc(loc, &ct_stmt_ops);
stmt->ct.key = key;
stmt->ct.tmpl = &ct_templates[key];
stmt->ct.expr = expr;
stmt->ct.direction = direction;
return stmt;
}
static void notrack_stmt_print(const struct stmt *stmt, struct output_ctx *octx)
{
printf("notrack");
}
static const struct stmt_ops notrack_stmt_ops = {
.type = STMT_NOTRACK,
.name = "notrack",
.print = notrack_stmt_print,
};
struct stmt *notrack_stmt_alloc(const struct location *loc)
{
return stmt_alloc(loc, ¬rack_stmt_ops);
}
static void __init ct_init(void)
{
datatype_register(&ct_state_type);
datatype_register(&ct_dir_type);
datatype_register(&ct_status_type);
}
|