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/*
* Socket expression/statement related definition and types.
*
* Copyright (c) 2018 Máté Eckl <ecklm94@gmail.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 <nftables.h>
#include <expression.h>
#include <socket.h>
#include <json.h>
const struct socket_template socket_templates[] = {
[NFT_SOCKET_TRANSPARENT] = {
.token = "transparent",
.dtype = &integer_type,
.len = BITS_PER_BYTE,
.byteorder = BYTEORDER_HOST_ENDIAN,
},
[NFT_SOCKET_MARK] = {
.token = "mark",
.dtype = &mark_type,
.len = 4 * BITS_PER_BYTE,
.byteorder = BYTEORDER_HOST_ENDIAN,
},
[NFT_SOCKET_WILDCARD] = {
.token = "wildcard",
.dtype = &integer_type,
.len = BITS_PER_BYTE,
.byteorder = BYTEORDER_HOST_ENDIAN,
},
[NFT_SOCKET_CGROUPV2] = {
.token = "cgroupv2",
.dtype = &cgroupv2_type,
.len = 8 * BITS_PER_BYTE,
.byteorder = BYTEORDER_HOST_ENDIAN,
},
};
static void socket_expr_print(const struct expr *expr, struct output_ctx *octx)
{
nft_print(octx, "socket %s", socket_templates[expr->socket.key].token);
if (expr->socket.key == NFT_SOCKET_CGROUPV2)
nft_print(octx, " level %u", expr->socket.level);
}
static bool socket_expr_cmp(const struct expr *e1, const struct expr *e2)
{
return e1->socket.key == e2->socket.key &&
e1->socket.level == e2->socket.level;
}
static void socket_expr_clone(struct expr *new, const struct expr *expr)
{
new->socket.key = expr->socket.key;
new->socket.level = expr->socket.level;
}
#define NFTNL_UDATA_SOCKET_KEY 0
#define NFTNL_UDATA_SOCKET_MAX 1
static int socket_expr_build_udata(struct nftnl_udata_buf *udbuf,
const struct expr *expr)
{
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_SOCKET_KEY, expr->socket.key);
return 0;
}
static int socket_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_SOCKET_KEY:
if (len != sizeof(uint32_t))
return -1;
break;
default:
return 0;
}
ud[type] = attr;
return 0;
}
static struct expr *socket_expr_parse_udata(const struct nftnl_udata *attr)
{
const struct nftnl_udata *ud[NFTNL_UDATA_SOCKET_MAX + 1] = {};
uint32_t key;
int err;
err = nftnl_udata_parse(nftnl_udata_get(attr), nftnl_udata_len(attr),
socket_parse_udata, ud);
if (err < 0)
return NULL;
if (!ud[NFTNL_UDATA_SOCKET_KEY])
return NULL;
key = nftnl_udata_get_u32(ud[NFTNL_UDATA_SOCKET_KEY]);
return socket_expr_alloc(&internal_location, key, 0);
}
const struct expr_ops socket_expr_ops = {
.type = EXPR_SOCKET,
.name = "socket",
.print = socket_expr_print,
.json = socket_expr_json,
.cmp = socket_expr_cmp,
.clone = socket_expr_clone,
.build_udata = socket_expr_build_udata,
.parse_udata = socket_expr_parse_udata,
};
struct expr *socket_expr_alloc(const struct location *loc,
enum nft_socket_keys key, uint32_t level)
{
const struct socket_template *tmpl = &socket_templates[key];
struct expr *expr;
expr = expr_alloc(loc, EXPR_SOCKET, tmpl->dtype,
tmpl->byteorder, tmpl->len);
expr->socket.key = key;
expr->socket.level = level;
return expr;
}
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