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/*
* Routing expression related definition and types.
*
* Copyright (c) 2016 Anders K. Pedersen <akp@cohaesio.com>
*
* 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.
*/
#include <errno.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <arpa/inet.h>
#include <linux/netfilter.h>
#include <nftables.h>
#include <expression.h>
#include <datatype.h>
#include <rt.h>
#include <rule.h>
#include <json.h>
void realm_table_rt_init(struct nft_ctx *ctx)
{
ctx->output.tbl.realm = rt_symbol_table_init("/etc/iproute2/rt_realms");
}
void realm_table_rt_exit(struct nft_ctx *ctx)
{
rt_symbol_table_free(ctx->output.tbl.realm);
}
static void realm_type_print(const struct expr *expr, struct output_ctx *octx)
{
return symbolic_constant_print(octx->tbl.realm, expr, true, octx);
}
static struct error_record *realm_type_parse(struct parse_ctx *ctx,
const struct expr *sym,
struct expr **res)
{
return symbolic_constant_parse(ctx, sym, ctx->tbl->realm, res);
}
const struct datatype realm_type = {
.type = TYPE_REALM,
.name = "realm",
.desc = "routing realm",
.byteorder = BYTEORDER_HOST_ENDIAN,
.size = 4 * BITS_PER_BYTE,
.basetype = &integer_type,
.print = realm_type_print,
.parse = realm_type_parse,
.flags = DTYPE_F_PREFIX,
};
const struct rt_template rt_templates[] = {
[NFT_RT_CLASSID] = RT_TEMPLATE("classid",
&realm_type,
4 * BITS_PER_BYTE,
BYTEORDER_HOST_ENDIAN,
false),
[NFT_RT_NEXTHOP4] = RT_TEMPLATE("nexthop",
&ipaddr_type,
4 * BITS_PER_BYTE,
BYTEORDER_BIG_ENDIAN,
true),
[NFT_RT_NEXTHOP6] = RT_TEMPLATE("nexthop",
&ip6addr_type,
16 * BITS_PER_BYTE,
BYTEORDER_BIG_ENDIAN,
true),
[NFT_RT_TCPMSS] = RT_TEMPLATE("mtu",
&integer_type,
2 * BITS_PER_BYTE,
BYTEORDER_HOST_ENDIAN,
false),
[NFT_RT_XFRM] = RT_TEMPLATE("ipsec",
&boolean_type,
BITS_PER_BYTE,
BYTEORDER_HOST_ENDIAN,
false),
};
static void rt_expr_print(const struct expr *expr, struct output_ctx *octx)
{
const char *ip = "";
switch (expr->rt.key) {
case NFT_RT_NEXTHOP4:
ip = "ip ";
break;
case NFT_RT_NEXTHOP6:
ip = "ip6 ";
break;
default:
break;
}
nft_print(octx, "rt %s%s", ip, rt_templates[expr->rt.key].token);
}
static bool rt_expr_cmp(const struct expr *e1, const struct expr *e2)
{
return e1->rt.key == e2->rt.key;
}
static void rt_expr_clone(struct expr *new, const struct expr *expr)
{
new->rt.key = expr->rt.key;
}
#define NFTNL_UDATA_RT_KEY 0
#define NFTNL_UDATA_RT_MAX 1
static int rt_expr_build_udata(struct nftnl_udata_buf *udbuf,
const struct expr *expr)
{
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_RT_KEY, expr->rt.key);
return 0;
}
static int rt_parse_udata(const struct nftnl_udata *attr, void *data)
{
const struct nftnl_udata **ud = data;
uint8_t type = nftnl_udata_type(attr);
uint8_t len = nftnl_udata_len(attr);
switch (type) {
case NFTNL_UDATA_RT_KEY:
if (len != sizeof(uint32_t))
return -1;
break;
default:
return 0;
}
ud[type] = attr;
return 0;
}
static struct expr *rt_expr_parse_udata(const struct nftnl_udata *attr)
{
const struct nftnl_udata *ud[NFTNL_UDATA_RT_MAX + 1] = {};
uint32_t key;
int err;
err = nftnl_udata_parse(nftnl_udata_get(attr), nftnl_udata_len(attr),
rt_parse_udata, ud);
if (err < 0)
return NULL;
if (!ud[NFTNL_UDATA_RT_KEY])
return NULL;
key = nftnl_udata_get_u32(ud[NFTNL_UDATA_RT_KEY]);
return rt_expr_alloc(&internal_location, key, false);
}
const struct expr_ops rt_expr_ops = {
.type = EXPR_RT,
.name = "rt",
.print = rt_expr_print,
.json = rt_expr_json,
.cmp = rt_expr_cmp,
.clone = rt_expr_clone,
.parse_udata = rt_expr_parse_udata,
.build_udata = rt_expr_build_udata,
};
struct expr *rt_expr_alloc(const struct location *loc, enum nft_rt_keys key,
bool invalid)
{
const struct rt_template *tmpl = &rt_templates[key];
struct expr *expr;
if (invalid && tmpl->invalid)
expr = expr_alloc(loc, EXPR_RT, &invalid_type,
tmpl->byteorder, 0);
else
expr = expr_alloc(loc, EXPR_RT, tmpl->dtype,
tmpl->byteorder, tmpl->len);
expr->rt.key = key;
return expr;
}
void rt_expr_update_type(struct proto_ctx *ctx, struct expr *expr)
{
const struct proto_desc *desc;
switch (expr->rt.key) {
case NFT_RT_NEXTHOP4:
desc = ctx->protocol[PROTO_BASE_NETWORK_HDR].desc;
if (desc == &proto_ip)
datatype_set(expr, &ipaddr_type);
else if (desc == &proto_ip6) {
expr->rt.key++;
datatype_set(expr, &ip6addr_type);
}
expr->len = expr->dtype->size;
break;
default:
break;
}
}
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