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/*
* XFRM (ipsec) expression
*
* Copyright (c) Red Hat GmbH. Author: Florian Westphal <fw@strlen.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 (or any
* later) as published by the Free Software Foundation.
*/
#include <nft.h>
#include <nftables.h>
#include <erec.h>
#include <expression.h>
#include <xfrm.h>
#include <datatype.h>
#include <gmputil.h>
#include <utils.h>
#include <netinet/ip.h>
#include <linux/netfilter.h>
#include <linux/xfrm.h>
#define XFRM_TEMPLATE_BE(__token, __dtype, __len) { \
.token = (__token), \
.dtype = (__dtype), \
.len = (__len), \
.byteorder = BYTEORDER_BIG_ENDIAN, \
}
#define XFRM_TEMPLATE_HE(__token, __dtype, __len) { \
.token = (__token), \
.dtype = (__dtype), \
.len = (__len), \
.byteorder = BYTEORDER_HOST_ENDIAN, \
}
const struct xfrm_template xfrm_templates[] = {
[NFT_XFRM_KEY_DADDR_IP4] = XFRM_TEMPLATE_BE("daddr", &ipaddr_type, 4 * BITS_PER_BYTE),
[NFT_XFRM_KEY_SADDR_IP4] = XFRM_TEMPLATE_BE("saddr", &ipaddr_type, 4 * BITS_PER_BYTE),
[NFT_XFRM_KEY_DADDR_IP6] = XFRM_TEMPLATE_BE("daddr", &ip6addr_type, 16 * BITS_PER_BYTE),
[NFT_XFRM_KEY_SADDR_IP6] = XFRM_TEMPLATE_BE("saddr", &ip6addr_type, 16 * BITS_PER_BYTE),
[NFT_XFRM_KEY_REQID] = XFRM_TEMPLATE_HE("reqid", &integer_type, 4 * BITS_PER_BYTE),
[NFT_XFRM_KEY_SPI] = XFRM_TEMPLATE_BE("spi", &integer_type, 4 * BITS_PER_BYTE),
};
static void xfrm_expr_print(const struct expr *expr, struct output_ctx *octx)
{
switch (expr->xfrm.direction) {
case XFRM_POLICY_IN:
nft_print(octx, "ipsec in");
break;
case XFRM_POLICY_OUT:
nft_print(octx, "ipsec out");
break;
default:
nft_print(octx, "ipsec (unknown dir %d)", expr->xfrm.direction);
break;
}
if (expr->xfrm.spnum)
nft_print(octx, " spnum %u", expr->xfrm.spnum);
switch (expr->xfrm.key) {
case NFT_XFRM_KEY_DADDR_IP4:
case NFT_XFRM_KEY_SADDR_IP4:
nft_print(octx, " ip");
break;
case NFT_XFRM_KEY_DADDR_IP6:
case NFT_XFRM_KEY_SADDR_IP6:
nft_print(octx, " ip6");
break;
case NFT_XFRM_KEY_REQID:
case NFT_XFRM_KEY_SPI:
break;
default:
nft_print(octx, " (unknown key 0x%x)", expr->xfrm.key);
return;
}
nft_print(octx, " %s", xfrm_templates[expr->xfrm.key].token);
}
static bool xfrm_expr_cmp(const struct expr *e1, const struct expr *e2)
{
return e1->xfrm.key == e2->xfrm.key &&
e1->xfrm.direction == e2->xfrm.direction &&
e1->xfrm.spnum == e2->xfrm.spnum;
}
static void xfrm_expr_clone(struct expr *new, const struct expr *expr)
{
memcpy(&new->xfrm, &expr->xfrm, sizeof(new->xfrm));
}
#define NFTNL_UDATA_XFRM_KEY 0
#define NFTNL_UDATA_XFRM_SPNUM 1
#define NFTNL_UDATA_XFRM_DIR 2
#define NFTNL_UDATA_XFRM_MAX 3
static int xfrm_expr_build_udata(struct nftnl_udata_buf *udbuf,
const struct expr *expr)
{
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_XFRM_KEY, expr->xfrm.key);
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_XFRM_SPNUM, expr->xfrm.spnum);
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_XFRM_DIR, expr->xfrm.direction);
return 0;
}
static int xfrm_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_XFRM_KEY:
case NFTNL_UDATA_XFRM_SPNUM:
case NFTNL_UDATA_XFRM_DIR:
if (len != sizeof(uint32_t))
return -1;
break;
default:
return 0;
}
ud[type] = attr;
return 0;
}
static struct expr *xfrm_expr_parse_udata(const struct nftnl_udata *attr)
{
const struct nftnl_udata *ud[NFTNL_UDATA_XFRM_MAX + 1] = {};
uint32_t key, dir, spnum;
int err;
err = nftnl_udata_parse(nftnl_udata_get(attr), nftnl_udata_len(attr),
xfrm_parse_udata, ud);
if (err < 0)
return NULL;
if (!ud[NFTNL_UDATA_XFRM_KEY] ||
!ud[NFTNL_UDATA_XFRM_DIR] ||
!ud[NFTNL_UDATA_XFRM_SPNUM])
return NULL;
key = nftnl_udata_get_u32(ud[NFTNL_UDATA_XFRM_KEY]);
dir = nftnl_udata_get_u32(ud[NFTNL_UDATA_XFRM_DIR]);
spnum = nftnl_udata_get_u32(ud[NFTNL_UDATA_XFRM_SPNUM]);
return xfrm_expr_alloc(&internal_location, dir, spnum, key);
}
const struct expr_ops xfrm_expr_ops = {
.type = EXPR_XFRM,
.name = "xfrm",
.print = xfrm_expr_print,
.json = xfrm_expr_json,
.cmp = xfrm_expr_cmp,
.clone = xfrm_expr_clone,
.parse_udata = xfrm_expr_parse_udata,
.build_udata = xfrm_expr_build_udata,
};
struct expr *xfrm_expr_alloc(const struct location *loc,
uint8_t direction,
uint8_t spnum,
enum nft_xfrm_keys key)
{
struct expr *expr;
expr = expr_alloc(loc, EXPR_XFRM,
xfrm_templates[key].dtype,
xfrm_templates[key].byteorder,
xfrm_templates[key].len);
expr->xfrm.direction = direction;
expr->xfrm.spnum = spnum;
expr->xfrm.key = key;
return expr;
}
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