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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2021 Ng Peng Nam Sean
* Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Copyright (C) The Internet Society (2003). All Rights Reserved.
*
* This document and translations of it may be copied and furnished to
* others, and derivative works that comment on or otherwise explain it
* or assist in its implementation may be prepared, copied, published
* and distributed, in whole or in part, without restriction of any
* kind, provided that the above copyright notice and this paragraph are
* included on all such copies and derivative works. However, this
* document itself may not be modified in any way, such as by removing
* the copyright notice or references to the Internet Society or other
* Internet organizations, except as needed for the purpose of
* developing Internet standards in which case the procedures for
* copyrights defined in the Internet Standards process must be
* followed, or as required to translate it into languages other than
* English.
*
* The limited permissions granted above are perpetual and will not be
* revoked by the Internet Society or its successors or assignees.
*
* This document and the information contained herein is provided on an
* "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
* TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
* BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
* HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
* This file contains structures and constants for RFC 3549 (Netlink)
* protocol. Some values have been taken from Linux implementation.
*/
#ifndef _NETLINK_NETLINK_H_
#define _NETLINK_NETLINK_H_
#include <sys/param.h>
#include <sys/socket.h>
struct sockaddr_nl {
uint8_t nl_len; /* sizeof(sockaddr_nl) */
sa_family_t nl_family; /* netlink family */
uint16_t nl_pad; /* reserved, set to 0 */
uint32_t nl_pid; /* desired port ID, 0 for auto-select */
uint32_t nl_groups; /* multicast groups mask to bind to */
};
#define SOL_NETLINK 270
/* Netlink socket options */
#define NETLINK_ADD_MEMBERSHIP 1 /* Subscribe for the specified group notifications */
#define NETLINK_DROP_MEMBERSHIP 2 /* Unsubscribe from the specified group */
#define NETLINK_PKTINFO 3 /* XXX: not supported */
#define NETLINK_BROADCAST_ERROR 4 /* XXX: not supported */
#define NETLINK_NO_ENOBUFS 5 /* XXX: not supported */
#define NETLINK_RX_RING 6 /* XXX: not supported */
#define NETLINK_TX_RING 7 /* XXX: not supported */
#define NETLINK_LISTEN_ALL_NSID 8 /* XXX: not supported */
#define NETLINK_LIST_MEMBERSHIPS 9
#define NETLINK_CAP_ACK 10 /* Send only original message header in the reply */
#define NETLINK_EXT_ACK 11 /* Ack support for receiving additional TLVs in ack */
#define NETLINK_GET_STRICT_CHK 12 /* Strict header checking */
#define NETLINK_MSG_INFO 257 /* (FreeBSD-specific) Receive message originator data in cmsg */
/*
* RFC 3549, 2.3.2 Netlink Message Header
*/
struct nlmsghdr {
uint32_t nlmsg_len; /* Length of message including header */
uint16_t nlmsg_type; /* Message type identifier */
uint16_t nlmsg_flags; /* Flags (NLM_F_) */
uint32_t nlmsg_seq; /* Sequence number */
uint32_t nlmsg_pid; /* Sending process port ID */
};
/*
* RFC 3549, 2.3.2 standard flag bits (nlmsg_flags)
*/
#define NLM_F_REQUEST 0x01 /* Indicateds request to kernel */
#define NLM_F_MULTI 0x02 /* Message is part of a group terminated by NLMSG_DONE msg */
#define NLM_F_ACK 0x04 /* Reply with ack message containing resulting error code */
#define NLM_F_ECHO 0x08 /* (not supported) Echo this request back */
#define NLM_F_DUMP_INTR 0x10 /* Dump was inconsistent due to sequence change */
#define NLM_F_DUMP_FILTERED 0x20 /* Dump was filtered as requested */
/*
* RFC 3549, 2.3.2 Additional flag bits for GET requests
*/
#define NLM_F_ROOT 0x100 /* Return the complete table */
#define NLM_F_MATCH 0x200 /* Return all entries matching criteria */
#define NLM_F_ATOMIC 0x400 /* Return an atomic snapshot (ignored) */
#define NLM_F_DUMP (NLM_F_ROOT | NLM_F_MATCH)
/*
* RFC 3549, 2.3.2 Additional flag bits for NEW requests
*/
#define NLM_F_REPLACE 0x100 /* Replace existing matching config object */
#define NLM_F_EXCL 0x200 /* Don't replace the object if exists */
#define NLM_F_CREATE 0x400 /* Create if it does not exist */
#define NLM_F_APPEND 0x800 /* Add to end of list */
/* Modifiers to DELETE requests */
#define NLM_F_NONREC 0x100 /* Do not delete recursively */
/* Flags for ACK message */
#define NLM_F_CAPPED 0x100 /* request was capped */
#define NLM_F_ACK_TLVS 0x200 /* extended ACK TVLs were included */
/*
* RFC 3549, 2.3.2 standard message types (nlmsg_type).
*/
#define NLMSG_NOOP 0x1 /* Message is ignored. */
#define NLMSG_ERROR 0x2 /* reply error code reporting */
#define NLMSG_DONE 0x3 /* Message terminates a multipart message. */
#define NLMSG_OVERRUN 0x4 /* overrun detected, data is lost */
#define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */
/*
* Defition of numbers assigned to the netlink subsystems.
*/
#define NETLINK_ROUTE 0 /* Routing/device hook */
#define NETLINK_UNUSED 1 /* not supported */
#define NETLINK_USERSOCK 2 /* not supported */
#define NETLINK_FIREWALL 3 /* not supported */
#define NETLINK_SOCK_DIAG 4 /* not supported */
#define NETLINK_NFLOG 5 /* not supported */
#define NETLINK_XFRM 6 /* (not supported) PF_SETKEY */
#define NETLINK_SELINUX 7 /* not supported */
#define NETLINK_ISCSI 8 /* not supported */
#define NETLINK_AUDIT 9 /* not supported */
#define NETLINK_FIB_LOOKUP 10 /* not supported */
#define NETLINK_CONNECTOR 11 /* not supported */
#define NETLINK_NETFILTER 12 /* not supported */
#define NETLINK_IP6_FW 13 /* not supported */
#define NETLINK_DNRTMSG 14 /* not supported */
#define NETLINK_KOBJECT_UEVENT 15 /* not supported */
#define NETLINK_GENERIC 16 /* Generic netlink (dynamic families) */
/*
* RFC 3549, 2.3.2.2 The ACK Netlink Message
*/
struct nlmsgerr {
int error;
struct nlmsghdr msg;
};
enum nlmsgerr_attrs {
NLMSGERR_ATTR_UNUSED,
NLMSGERR_ATTR_MSG = 1, /* string, error message */
NLMSGERR_ATTR_OFFS = 2, /* u32, offset of the invalid attr from nl header */
NLMSGERR_ATTR_COOKIE = 3, /* binary, data to pass to userland */
NLMSGERR_ATTR_POLICY = 4, /* not supported */
__NLMSGERR_ATTR_MAX,
NLMSGERR_ATTR_MAX = __NLMSGERR_ATTR_MAX - 1
};
/* FreeBSD-specific debugging info */
enum nlmsginfo_attrs {
NLMSGINFO_ATTR_UNUSED,
NLMSGINFO_ATTR_PROCESS_ID = 1, /* u32, source process PID */
NLMSGINFO_ATTR_PORT_ID = 2, /* u32, source socket nl_pid */
NLMSGINFO_ATTR_SEQ_ID = 3, /* u32, source message seq_id */
};
#define NL_ITEM_ALIGN_SIZE sizeof(uint32_t)
#define NL_ITEM_ALIGN(_len) __align_up(_len, NL_ITEM_ALIGN_SIZE)
#define NL_ITEM_DATA(_ptr, _off) ((void *)((char *)(_ptr) + _off))
#define NL_ITEM_DATA_CONST(_ptr, _off) ((const void *)((const char *)(_ptr) + _off))
#define NL_ITEM_OK(_ptr, _len, _hlen, _LEN_M) \
((_len) >= _hlen && _LEN_M(_ptr) >= _hlen && _LEN_M(_ptr) <= (_len))
#define NL_ITEM_NEXT(_ptr, _LEN_M) ((__typeof(_ptr))((char *)(_ptr) + _LEN_M(_ptr)))
#define NL_ITEM_ITER(_ptr, _len, _LEN_MACRO) \
((_len) -= _LEN_MACRO(_ptr), NL_ITEM_NEXT(_ptr, _LEN_MACRO))
/* part of netlink(3) API */
#define NLMSG_ALIGNTO NL_ITEM_ALIGN_SIZE
#define NLMSG_ALIGN(_len) NL_ITEM_ALIGN(_len)
#ifndef _KERNEL
/* part of netlink(3) API */
#define NLMSG_HDRLEN (sizeof(struct nlmsghdr))
#define NLMSG_LENGTH(_len) ((_len) + NLMSG_HDRLEN)
#define NLMSG_SPACE(_len) NLMSG_ALIGN(NLMSG_LENGTH(_len))
#define NLMSG_DATA(_hdr) NL_ITEM_DATA(_hdr, NLMSG_HDRLEN)
#define _NLMSG_LEN(_hdr) ((_hdr)->nlmsg_len)
#define _NLMSG_ALIGNED_LEN(_hdr) NLMSG_ALIGN(_NLMSG_LEN(_hdr))
#define NLMSG_OK(_hdr, _len) NL_ITEM_OK(_hdr, _len, NLMSG_HDRLEN, _NLMSG_LEN)
#define NLMSG_PAYLOAD(_hdr,_len) (_NLMSG_LEN(_hdr) - NLMSG_SPACE((_len)))
#define NLMSG_NEXT(_hdr, _len) NL_ITEM_ITER(_hdr, _len, _NLMSG_ALIGNED_LEN)
#else
#define NLMSG_HDRLEN (NLMSG_ALIGN(sizeof(struct nlmsghdr)))
#endif
/*
* Base netlink attribute TLV header.
*/
struct nlattr {
uint16_t nla_len; /* Total attribute length */
uint16_t nla_type; /* Attribute type */
};
/*
*
* nl_type field enconding:
*
* 0 1
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |N|O| Attribute type |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* N - attribute contains other attributes (mostly unused)
* O - encoded in network byte order (mostly unused)
* Note: N & O are mutually exclusive
*
* Note: attribute type value scope normally is either parent attribute
* or the message/message group.
*/
#define NLA_F_NESTED (1 << 15)
#define NLA_F_NET_BYTEORDER (1 << 14)
#define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
#ifndef _KERNEL
#define NLA_ALIGNTO NL_ITEM_ALIGN_SIZE
#define NLA_ALIGN(_len) NL_ITEM_ALIGN(_len)
#define NLA_HDRLEN ((int)sizeof(struct nlattr))
#endif
#endif
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