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/* Labeled IPsec
* Copyright (C) 2014 D. Hugh Redelmeier <hugh@mimosa.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <https://www.gnu.org/licenses/gpl2.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#ifndef _LABELED_IPSEC_H
#define _LABELED_IPSEC_H
/*
* Security Label Context representations.
*
* While security label length usually does not exceed 256,
* there have been requests (rhbz#1154784) for using larger
* labels. The maximum label size is PAGE_SIZE (4096 on a
* x86_64, but 64kb on ppc64). However, this label has to fit
* inside a netlink message whose maximum size is 32KiB.
* For now we picked the somewhat arbitrary size of 4096.
*/
#define MAX_SECCTX_LEN 4096 /* including '\0'*/
/*
* sec_ctx: representation in IKE packets, excluding text.
*
* See linux26/xfrm.h's struct xfrm_sec_ctx and struct xfrm_user_sec_ctx.
* For some unexplained reason the fields of those structs are in a different order!
* We use the order of xfrm_sec_ctx.
*
* Must be kept in sync with packet.c's sec_ctx_desc.
*/
struct sec_ctx {
uint8_t ctx_doi;
uint8_t ctx_alg; /* LSMs: e.g., selinux == 1 */
uint16_t ctx_len; /* of text label */
};
/*
* xfrm_user_sec_ctx_ike: representation within struct state.
* Also passed around between Pluto functions.
*/
struct xfrm_user_sec_ctx_ike {
struct sec_ctx ctx;
char sec_ctx_value[MAX_SECCTX_LEN]; /* text label, NUL-terminated */
};
#endif
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