7e5bf68495
Netlinks is a communication protocol currently used in Linux kernel to modify, read and subscribe for nearly all networking state. Interfaces, addresses, routes, firewall, fibs, vnets, etc are controlled via netlink. It is async, TLV-based protocol, providing 1-1 and 1-many communications. The current implementation supports the subset of NETLINK_ROUTE family. To be more specific, the following is supported: * Dumps: - routes - nexthops / nexthop groups - interfaces - interface addresses - neighbors (arp/ndp) * Notifications: - interface arrival/departure - interface address arrival/departure - route addition/deletion * Modifications: - adding/deleting routes - adding/deleting nexthops/nexthops groups - adding/deleting neghbors - adding/deleting interfaces (basic support only) * Rtsock interaction - route events are bridged both ways The implementation also supports the NETLINK_GENERIC family framework. Implementation notes: Netlink is implemented via loadable/unloadable kernel module, not touching many kernel parts. Each netlink socket uses dedicated taskqueue to support async operations that can sleep, such as interface creation. All message processing is performed within these taskqueues. Compatibility: Most of the Netlink data models specified above maps to FreeBSD concepts nicely. Unmodified ip(8) binary correctly works with interfaces, addresses, routes, nexthops and nexthop groups. Some software such as net/bird require header-only modifications to compile and work with FreeBSD netlink. Reviewed by: imp Differential Revision: https://reviews.freebsd.org/D36002 MFC after: 2 months
214 lines
7.5 KiB
C
214 lines
7.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Common defines for all parts of the NETLINK_ROUTE family
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*/
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#ifndef _NETLINK_ROUTE_COMMON_H_
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#define _NETLINK_ROUTE_COMMON_H_
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/* Defined NETLINK_ROUTE messages */
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enum {
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NL_RTM_BASE = 16,
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NL_RTM_NEWLINK = 16, /* creates new interface */
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NL_RTM_DELLINK = 17, /* deletes matching interface */
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NL_RTM_GETLINK = 18, /* lists matching interfaces */
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NL_RTM_SETLINK = 19, /* not supported */
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NL_RTM_NEWADDR = 20, /* not supported */
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NL_RTM_DELADDR = 21, /* not supported */
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NL_RTM_GETADDR = 22, /* lists matching ifaddrs */
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NL_RTM_NEWROUTE = 24, /* adds or changes a route */
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NL_RTM_DELROUTE = 25, /* deletes matching route */
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NL_RTM_GETROUTE = 26, /* lists matching routes */
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NL_RTM_NEWNEIGH = 28, /* creates new arp/ndp entry */
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NL_RTM_DELNEIGH = 29, /* deletes matching arp/ndp entry */
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NL_RTM_GETNEIGH = 30, /* lists matching arp/ndp entry */
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NL_RTM_NEWRULE = 32, /* not supported */
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NL_RTM_DELRULE = 33, /* not supported */
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NL_RTM_GETRULE = 34, /* not supported */
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NL_RTM_NEWQDISC = 36, /* not supported */
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NL_RTM_DELQDISC = 37, /* not supported */
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NL_RTM_GETQDISC = 38, /* not supported */
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NL_RTM_NEWTCLASS = 40, /* not supported */
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NL_RTM_DELTCLASS = 41, /* not supported */
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NL_RTM_GETTCLASS = 42, /* not supported */
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NL_RTM_NEWTFILTER = 44, /* not supported */
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NL_RTM_DELTFILTER = 45, /* not supported */
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NL_RTM_GETTFILTER = 46, /* not supported */
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NL_RTM_NEWACTION = 48, /* not supported */
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NL_RTM_DELACTION = 49, /* not supported */
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NL_RTM_GETACTION = 50, /* not supported */
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NL_RTM_NEWPREFIX = 52, /* not supported */
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NL_RTM_GETMULTICAST = 58, /* not supported */
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NL_RTM_GETANYCAST = 62, /* not supported */
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NL_RTM_NEWNEIGHTBL = 64, /* not supported */
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NL_RTM_GETNEIGHTBL = 66, /* not supported */
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NL_RTM_SETNEIGHTBL = 67, /* not supported */
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NL_RTM_NEWNDUSEROPT = 68, /* not supported */
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NL_RTM_NEWADDRLABEL = 72, /* not supported */
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NL_RTM_DELADDRLABEL = 73, /* not supported */
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NL_RTM_GETADDRLABEL = 74, /* not supported */
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NL_RTM_GETDCB = 78, /* not supported */
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NL_RTM_SETDCB = 79, /* not supported */
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NL_RTM_NEWNETCONF = 80, /* not supported */
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NL_RTM_GETNETCONF = 82, /* not supported */
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NL_RTM_NEWMDB = 84, /* not supported */
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NL_RTM_DELMDB = 85, /* not supported */
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NL_RTM_GETMDB = 86, /* not supported */
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NL_RTM_NEWNSID = 88, /* not supported */
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NL_RTM_DELNSID = 89, /* not supported */
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NL_RTM_GETNSID = 90, /* not supported */
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NL_RTM_NEWSTATS = 92, /* not supported */
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NL_RTM_GETSTATS = 94, /* not supported */
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NL_RTM_NEWNEXTHOP = 104, /* creates new user nexhtop */
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NL_RTM_DELNEXTHOP = 105, /* deletes matching nexthop */
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NL_RTM_GETNEXTHOP = 106, /* lists created user nexthops */
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__NL_RTM_MAX,
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};
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#define NL_RTM_MAX (((__NL_RTM_MAX + 3) & ~3) - 1)
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#ifndef _KERNEL
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/*
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* RTM_* namespace clashes with BSD rtsock namespace.
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* Use NL_RTM_ prefix in the kernel and map it to RTM_
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* for userland.
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*/
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#define RTM_BASE NL_RTM_BASE
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#define RTM_NEWLINK NL_RTM_NEWLINK
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#define RTM_DELLINK NL_RTM_DELLINK
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#define RTM_GETLINK NL_RTM_GETLINK
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#define RTM_SETLINK NL_RTM_SETLINK
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#define RTM_NEWADDR NL_RTM_NEWADDR
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#define RTM_DELADDR NL_RTM_DELADDR
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#define RTM_GETADDR NL_RTM_GETADDR
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#define RTM_NEWROUTE NL_RTM_NEWROUTE
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#define RTM_DELROUTE NL_RTM_DELROUTE
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#define RTM_GETROUTE NL_RTM_GETROUTE
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#define RTM_NEWNEXTHOP NL_RTM_NEWNEXTHOP
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#define RTM_DELNEXTHOP NL_RTM_DELNEXTHOP
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#define RTM_GETNEXTHOP NL_RTM_GETNEXTHOP
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#endif
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#ifndef _KERNEL
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/* rtnetlink multicast groups - backwards compatibility for userspace */
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#define RTMGRP_LINK 0x01
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#define RTMGRP_NOTIFY 0x02
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#define RTMGRP_NEIGH 0x04
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#define RTMGRP_TC 0x08
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#define RTMGRP_IPV4_IFADDR 0x10
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#define RTMGRP_IPV4_MROUTE 0x20
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#define RTMGRP_IPV4_ROUTE 0x40
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#define RTMGRP_IPV4_RULE 0x80
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#define RTMGRP_IPV6_IFADDR 0x100
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#define RTMGRP_IPV6_MROUTE 0x200
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#define RTMGRP_IPV6_ROUTE 0x400
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#define RTMGRP_IPV6_IFINFO 0x800
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#define RTMGRP_DECnet_IFADDR 0x1000
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#define RTMGRP_DECnet_ROUTE 0x4000
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#define RTMGRP_IPV6_PREFIX 0x20000
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#endif
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/* Defined NETLINK_ROUTE multicast groups */
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enum rtnetlink_groups {
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RTNLGRP_NONE,
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#define RTNLGRP_NONE RTNLGRP_NONE
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RTNLGRP_LINK,
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#define RTNLGRP_LINK RTNLGRP_LINK
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RTNLGRP_NOTIFY,
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#define RTNLGRP_NOTIFY RTNLGRP_NOTIFY
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RTNLGRP_NEIGH,
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#define RTNLGRP_NEIGH RTNLGRP_NEIGH
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RTNLGRP_TC,
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#define RTNLGRP_TC RTNLGRP_TC
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RTNLGRP_IPV4_IFADDR,
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#define RTNLGRP_IPV4_IFADDR RTNLGRP_IPV4_IFADDR
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RTNLGRP_IPV4_MROUTE,
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#define RTNLGRP_IPV4_MROUTE RTNLGRP_IPV4_MROUTE
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RTNLGRP_IPV4_ROUTE,
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#define RTNLGRP_IPV4_ROUTE RTNLGRP_IPV4_ROUTE
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RTNLGRP_IPV4_RULE,
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#define RTNLGRP_IPV4_RULE RTNLGRP_IPV4_RULE
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RTNLGRP_IPV6_IFADDR,
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#define RTNLGRP_IPV6_IFADDR RTNLGRP_IPV6_IFADDR
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RTNLGRP_IPV6_MROUTE,
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#define RTNLGRP_IPV6_MROUTE RTNLGRP_IPV6_MROUTE
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RTNLGRP_IPV6_ROUTE,
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#define RTNLGRP_IPV6_ROUTE RTNLGRP_IPV6_ROUTE
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RTNLGRP_IPV6_IFINFO,
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#define RTNLGRP_IPV6_IFINFO RTNLGRP_IPV6_IFINFO
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RTNLGRP_DECnet_IFADDR,
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#define RTNLGRP_DECnet_IFADDR RTNLGRP_DECnet_IFADDR
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RTNLGRP_NOP2,
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RTNLGRP_DECnet_ROUTE,
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#define RTNLGRP_DECnet_ROUTE RTNLGRP_DECnet_ROUTE
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RTNLGRP_DECnet_RULE,
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#define RTNLGRP_DECnet_RULE RTNLGRP_DECnet_RULE
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RTNLGRP_NOP4,
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RTNLGRP_IPV6_PREFIX,
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#define RTNLGRP_IPV6_PREFIX RTNLGRP_IPV6_PREFIX
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RTNLGRP_IPV6_RULE,
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#define RTNLGRP_IPV6_RULE RTNLGRP_IPV6_RULE
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RTNLGRP_ND_USEROPT,
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#define RTNLGRP_ND_USEROPT RTNLGRP_ND_USEROPT
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RTNLGRP_PHONET_IFADDR,
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#define RTNLGRP_PHONET_IFADDR RTNLGRP_PHONET_IFADDR
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RTNLGRP_PHONET_ROUTE,
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#define RTNLGRP_PHONET_ROUTE RTNLGRP_PHONET_ROUTE
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RTNLGRP_DCB,
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#define RTNLGRP_DCB RTNLGRP_DCB
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RTNLGRP_IPV4_NETCONF,
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#define RTNLGRP_IPV4_NETCONF RTNLGRP_IPV4_NETCONF
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RTNLGRP_IPV6_NETCONF,
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#define RTNLGRP_IPV6_NETCONF RTNLGRP_IPV6_NETCONF
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RTNLGRP_MDB,
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#define RTNLGRP_MDB RTNLGRP_MDB
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RTNLGRP_MPLS_ROUTE,
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#define RTNLGRP_MPLS_ROUTE RTNLGRP_MPLS_ROUTE
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RTNLGRP_NSID,
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#define RTNLGRP_NSID RTNLGRP_NSID
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RTNLGRP_MPLS_NETCONF,
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#define RTNLGRP_MPLS_NETCONF RTNLGRP_MPLS_NETCONF
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RTNLGRP_IPV4_MROUTE_R,
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#define RTNLGRP_IPV4_MROUTE_R RTNLGRP_IPV4_MROUTE_R
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RTNLGRP_IPV6_MROUTE_R,
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#define RTNLGRP_IPV6_MROUTE_R RTNLGRP_IPV6_MROUTE_R
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RTNLGRP_NEXTHOP,
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#define RTNLGRP_NEXTHOP RTNLGRP_NEXTHOP
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RTNLGRP_BRVLAN,
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#define RTNLGRP_BRVLAN RTNLGRP_BRVLAN
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__RTNLGRP_MAX
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};
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#define RTNLGRP_MAX (__RTNLGRP_MAX - 1)
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#endif
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