Add support for the scenario when user adds/deletes paths for a single prefix one-by-one, all with different weights. This change adds a new FreeBSD-specific RTA attribute, NL_RTA_WEIGHT. When dumping non-multipath routes, this attribute is added if the route weight is not RT_DEFAULT_WEIGHT. When adding a new route, this attribute is parsed as a relative path weight. MFC after: 2 weeks
368 lines
13 KiB
C
368 lines
13 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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* Route-related (RTM_<NEW|DEL|GET>ROUTE) message header and attributes.
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*/
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#ifndef _NETLINK_ROUTE_ROUTE_H_
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#define _NETLINK_ROUTE_ROUTE_H_
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/* Base header for all of the relevant messages */
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struct rtmsg {
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unsigned char rtm_family; /* address family */
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unsigned char rtm_dst_len; /* Prefix length */
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unsigned char rtm_src_len; /* Source prefix length (not used) */
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unsigned char rtm_tos; /* Type of service (not used) */
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unsigned char rtm_table; /* rtable id */
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unsigned char rtm_protocol; /* Routing protocol id (RTPROT_) */
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unsigned char rtm_scope; /* Route distance (RT_SCOPE_) */
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unsigned char rtm_type; /* Route type (RTN_) */
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unsigned rtm_flags; /* Route flags (RTM_F_) */
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};
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/*
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* RFC 3549, 3.1.1, route type (rtm_type field).
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*/
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enum {
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RTN_UNSPEC,
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RTN_UNICAST, /* Unicast route */
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RTN_LOCAL, /* Accept locally (not supported) */
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RTN_BROADCAST, /* Accept locally as broadcast, send as broadcast */
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RTN_ANYCAST, /* Accept locally as broadcast, but send as unicast */
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RTN_MULTICAST, /* Multicast route */
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RTN_BLACKHOLE, /* Drop traffic towards destination */
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RTN_UNREACHABLE, /* Destination is unreachable */
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RTN_PROHIBIT, /* Administratively prohibited */
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RTN_THROW, /* Not in this table (not supported) */
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RTN_NAT, /* Translate this address (not supported) */
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RTN_XRESOLVE, /* Use external resolver (not supported) */
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__RTN_MAX,
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};
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#define RTN_MAX (__RTN_MAX - 1)
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/*
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* RFC 3549, 3.1.1, protocol (Identifies what/who added the route).
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* Values larger than RTPROT_STATIC(4) are not interpreted by the
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* kernel, they are just for user information.
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*/
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#define RTPROT_UNSPEC 0
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#define RTPROT_REDIRECT 1 /* Route installed by ICMP redirect */
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#define RTPROT_KERNEL 2 /* Route installed by kernel */
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#define RTPROT_BOOT 3 /* Route installed during boot */
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#define RTPROT_STATIC 4 /* Route installed by administrator */
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#define RTPROT_GATED 8
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#define RTPROT_RA 9
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#define RTPROT_MRT 1
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#define RTPROT_ZEBRA 11
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#define RTPROT_BIRD 12
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#define RTPROT_DNROUTED 13
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#define RTPROT_XORP 14
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#define RTPROT_NTK 15
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#define RTPROT_DHCP 16
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#define RTPROT_MROUTED 17
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#define RTPROT_KEEPALIVED 18
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#define RTPROT_BABEL 42
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#define RTPROT_OPENR 99
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#define RTPROT_BGP 186
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#define RTPROT_ISIS 187
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#define RTPROT_OSPF 188
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#define RTPROT_RIP 189
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#define RTPROT_EIGRP 192
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/*
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* RFC 3549 3.1.1 Route scope (valid distance to destination).
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*
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* The values between RT_SCOPE_UNIVERSE(0) and RT_SCOPE_SITE(200)
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* are available to the user.
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*/
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enum rt_scope_t {
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RT_SCOPE_UNIVERSE = 0,
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/* User defined values */
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RT_SCOPE_SITE = 200,
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RT_SCOPE_LINK = 253,
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RT_SCOPE_HOST = 254,
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RT_SCOPE_NOWHERE = 255
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};
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/*
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* RFC 3549 3.1.1 Route flags (rtm_flags).
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* Is a composition of RTNH_F flags (0x1..0x40 range), RTM_F flags (below)
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* and per-protocol (IPv4/IPv6) flags.
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*/
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#define RTM_F_NOTIFY 0x00000100 /* not supported */
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#define RTM_F_CLONED 0x00000200 /* not supported */
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#define RTM_F_EQUALIZE 0x00000400 /* not supported */
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#define RTM_F_PREFIX 0x00000800 /* not supported */
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#define RTM_F_LOOKUP_TABLE 0x00001000 /* not supported */
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#define RTM_F_FIB_MATCH 0x00002000 /* not supported */
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#define RTM_F_OFFLOAD 0x00004000 /* not supported */
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#define RTM_F_TRAP 0x00008000 /* not supported */
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#define RTM_F_OFFLOAD_FAILED 0x20000000 /* not supported */
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/* Compatibility handling helpers */
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#ifndef _KERNEL
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#define NL_RTM_HDRLEN ((int)sizeof(struct rtmsg))
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#define RTM_RTA(_rtm) ((struct rtattr *)((char *)(_rtm) + NL_RTM_HDRLEN))
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#define RTM_PAYLOAD(_hdr) NLMSG_PAYLOAD((_hdr), NL_RTM_HDRLEN)
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#endif
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/*
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* Routing table identifiers.
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* FreeBSD route table numbering starts from 0, where 0 is a valid default routing table.
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* Indicating "all tables" via netlink can be done by not including RTA_TABLE attribute
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* and keeping rtm_table=0 (compatibility) or setting RTA_TABLE value to RT_TABLE_UNSPEC.
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*/
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#define RT_TABLE_MAIN 0 /* RT_DEFAULT_FIB */
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#define RT_TABLE_UNSPEC 0xFFFFFFFF /* RT_ALL_FIBS */
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enum rtattr_type_t {
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NL_RTA_UNSPEC,
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NL_RTA_DST = 1, /* binary, IPv4/IPv6 destination */
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NL_RTA_SRC = 2, /* binary, preferred source address */
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NL_RTA_IIF = 3, /* not supported */
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NL_RTA_OIF = 4, /* u32, transmit ifindex */
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NL_RTA_GATEWAY = 5, /* binary: IPv4/IPv6 gateway */
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NL_RTA_PRIORITY = 6, /* not supported */
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NL_RTA_PREFSRC = 7, /* not supported */
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NL_RTA_METRICS = 8, /* nested, list of NL_RTAX* attrs */
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NL_RTA_MULTIPATH = 9, /* binary, array of struct rtnexthop */
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NL_RTA_PROTOINFO = 10, /* not supported / deprecated */
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NL_RTA_KNH_ID = 10, /* u32, FreeBSD specific, kernel nexthop index */
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NL_RTA_FLOW = 11, /* not supported */
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NL_RTA_CACHEINFO = 12, /* not supported */
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NL_RTA_SESSION = 13, /* not supported / deprecated */
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NL_RTA_WEIGHT = 13, /* u32, FreeBSD specific, path weight */
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NL_RTA_MP_ALGO = 14, /* not supported / deprecated */
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NL_RTA_RTFLAGS = 14, /* u32, FreeBSD specific, path flags (RTF_)*/
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NL_RTA_TABLE = 15, /* u32, fibnum */
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NL_RTA_MARK = 16, /* not supported */
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NL_RTA_MFC_STATS = 17, /* not supported */
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NL_RTA_VIA = 18, /* binary, struct rtvia */
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NL_RTA_NEWDST = 19, /* not supported */
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NL_RTA_PREF = 20, /* not supported */
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NL_RTA_ENCAP_TYPE = 21, /* not supported */
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NL_RTA_ENCAP = 22, /* not supported */
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NL_RTA_EXPIRES = 23, /* u32, seconds till expiration */
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NL_RTA_PAD = 24, /* not supported */
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NL_RTA_UID = 25, /* not supported */
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NL_RTA_TTL_PROPAGATE = 26, /* not supported */
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NL_RTA_IP_PROTO = 27, /* not supported */
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NL_RTA_SPORT = 28, /* not supported */
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NL_RTA_DPORT = 29, /* not supported */
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NL_RTA_NH_ID = 30, /* u32, nexthop/nexthop group index */
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__RTA_MAX
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};
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#define NL_RTA_MAX (__RTA_MAX - 1)
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/*
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* Attributes that can be used as filters:
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*
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*/
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#ifndef _KERNEL
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/*
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* RTA_* space has clashes with rtsock namespace.
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* Use NL_RTA_ prefix in the kernel and map to
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* RTA_ for userland.
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*/
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#define RTA_UNSPEC NL_RTA_UNSPEC
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#define RTA_DST NL_RTA_DST
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#define RTA_SRC NL_RTA_SRC
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#define RTA_IIF NL_RTA_IIF
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#define RTA_OIF NL_RTA_OIF
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#define RTA_GATEWAY NL_RTA_GATEWAY
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#define RTA_PRIORITY NL_RTA_PRIORITY
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#define RTA_PREFSRC NL_RTA_PREFSRC
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#define RTA_METRICS NL_RTA_METRICS
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#define RTA_MULTIPATH NL_RTA_MULTIPATH
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#define RTA_PROTOINFO NL_RTA_PROTOINFO
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#define RTA_KNH_ID NL_RTA_KNH_ID
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#define RTA_FLOW NL_RTA_FLOW
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#define RTA_CACHEINFO NL_RTA_CACHEINFO
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#define RTA_SESSION NL_RTA_SESSION
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#define RTA_MP_ALGO NL_RTA_MP_ALGO
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#define RTA_TABLE NL_RTA_TABLE
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#define RTA_MARK NL_RTA_MARK
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#define RTA_MFC_STATS NL_RTA_MFC_STATS
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#define RTA_VIA NL_RTA_VIA
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#define RTA_NEWDST NL_RTA_NEWDST
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#define RTA_PREF NL_RTA_PREF
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#define RTA_ENCAP_TYPE NL_RTA_ENCAP_TYPE
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#define RTA_ENCAP NL_RTA_ENCAP
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#define RTA_EXPIRES NL_RTA_EXPIRES
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#define RTA_PAD NL_RTA_PAD
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#define RTA_UID NL_RTA_UID
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#define RTA_TTL_PROPAGATE NL_RTA_TTL_PROPAGATE
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#define RTA_IP_PROTO NL_RTA_IP_PROTO
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#define RTA_SPORT NL_RTA_SPORT
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#define RTA_DPORT NL_RTA_DPORT
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#define RTA_NH_ID NL_RTA_NH_ID
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#define RTA_MAX NL_RTA_MAX
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#endif
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/* route attribute header */
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struct rtattr {
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unsigned short rta_len;
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unsigned short rta_type;
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};
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#define NL_RTA_ALIGN_SIZE NL_ITEM_ALIGN_SIZE
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#define NL_RTA_ALIGN NL_ITEM_ALIGN
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#define NL_RTA_HDRLEN ((int)sizeof(struct rtattr))
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#define NL_RTA_DATA_LEN(_rta) ((int)((_rta)->rta_len - NL_RTA_HDRLEN))
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#define NL_RTA_DATA(_rta) NL_ITEM_DATA(_rta, NL_RTA_HDRLEN)
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#define NL_RTA_DATA_CONST(_rta) NL_ITEM_DATA_CONST(_rta, NL_RTA_HDRLEN)
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/* Compatibility attribute handling helpers */
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#ifndef _KERNEL
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#define RTA_ALIGNTO NL_RTA_ALIGN_SIZE
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#define RTA_ALIGN(_len) NL_RTA_ALIGN(_len)
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#define _RTA_LEN(_rta) ((int)(_rta)->rta_len)
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#define _RTA_ALIGNED_LEN(_rta) RTA_ALIGN(_RTA_LEN(_rta))
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#define RTA_OK(_rta, _len) NL_ITEM_OK(_rta, _len, NL_RTA_HDRLEN, _RTA_LEN)
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#define RTA_NEXT(_rta, _len) NL_ITEM_ITER(_rta, _len, _RTA_ALIGNED_LEN)
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#define RTA_LENGTH(_len) (NL_RTA_HDRLEN + (_len))
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#define RTA_SPACE(_len) RTA_ALIGN(RTA_LENGTH(_len))
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#define RTA_DATA(_rta) NL_RTA_DATA(_rta)
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#define RTA_PAYLOAD(_rta) ((int)(_RTA_LEN(_rta) - NL_RTA_HDRLEN))
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#endif
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/* RTA attribute headers */
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/* RTA_VIA */
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struct rtvia {
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sa_family_t rtvia_family;
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uint8_t rtvia_addr[0];
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};
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/*
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* RTA_METRICS is a nested attribute, consisting of a list of
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* TLVs with types defined below.
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*/
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enum {
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NL_RTAX_UNSPEC,
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NL_RTAX_LOCK = 1, /* not supported */
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NL_RTAX_MTU = 2, /* desired path MTU */
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NL_RTAX_WINDOW = 3, /* not supported */
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NL_RTAX_RTT = 4, /* not supported */
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NL_RTAX_RTTVAR = 5, /* not supported */
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NL_RTAX_SSTHRESH = 6, /* not supported */
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NL_RTAX_CWND = 7, /* not supported */
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NL_RTAX_ADVMSS = 8, /* not supported */
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NL_RTAX_REORDERING = 9, /* not supported */
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NL_RTAX_HOPLIMIT = 10, /* not supported */
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NL_RTAX_INITCWND = 11, /* not supporrted */
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NL_RTAX_FEATURES = 12, /* not supported */
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NL_RTAX_RTO_MIN = 13, /* not supported */
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NL_RTAX_INITRWND = 14, /* not supported */
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NL_RTAX_QUICKACK = 15, /* not supported */
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NL_RTAX_CC_ALGO = 15, /* not supported */
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NL_RTAX_FASTOPEN_NO_COOKIE = 16, /* not supported */
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__NL_RTAX_MAX
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};
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#define NL_RTAX_MAX (__NL_RTAX_MAX - 1)
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#define RTAX_FEATURE_ECN (1 << 0)
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#define RTAX_FEATURE_SACK (1 << 1)
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#define RTAX_FEATURE_TIMESTAMP (1 << 2)
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#define RTAX_FEATURE_ALLFRAG (1 << 3)
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#define RTAX_FEATURE_MASK \
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(RTAX_FEATURE_ECN | RTAX_FEATURE_SACK | RTAX_FEATURE_TIMESTAMP | \
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RTAX_FEATURE_ALLFRAG)
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#ifndef _KERNEL
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/*
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* RTAX_* space clashes with rtsock namespace.
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* Use NL_RTAX_ prefix in the kernel and map to
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* RTAX_ for userland.
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*/
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#define RTAX_UNSPEC NL_RTAX_UNSPEC
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#define RTAX_LOCK NL_RTAX_LOCK
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#define RTAX_MTU NL_RTAX_MTU
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#define RTAX_WINDOW NL_RTAX_WINDOW
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#define RTAX_RTT NL_RTAX_RTT
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#define RTAX_RTTVAR NL_RTAX_RTTVAR
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#define RTAX_SSTHRESH NL_RTAX_SSTHRESH
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#define RTAX_CWND NL_RTAX_CWND
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#define RTAX_ADVMSS NL_RTAX_ADVMSS
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#define RTAX_REORDERING NL_RTAX_REORDERING
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#define RTAX_HOPLIMIT NL_RTAX_HOPLIMIT
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#define RTAX_INITCWND NL_RTAX_INITCWND
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#define RTAX_FEATURES NL_RTAX_FEATURES
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#define RTAX_RTO_MIN NL_RTAX_RTO_MIN
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#define RTAX_INITRWND NL_RTAX_INITRWND
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#define RTAX_QUICKACK NL_RTAX_QUICKACK
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#define RTAX_CC_ALGO NL_RTAX_CC_ALGO
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#define RTAX_FASTOPEN_NO_COOKIE NL_RTAX_FASTOPEN_NO_COOKIE
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#endif
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/*
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* RTA_MULTIPATH consists of an array of rtnexthop structures.
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* Each rtnexthop structure contains RTA_GATEWAY or RTA_VIA
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* attribute following the header.
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*/
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struct rtnexthop {
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unsigned short rtnh_len;
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unsigned char rtnh_flags;
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unsigned char rtnh_hops; /* nexthop weight */
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int rtnh_ifindex;
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};
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/* rtnh_flags */
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#define RTNH_F_DEAD 0x01 /* not supported */
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#define RTNH_F_PERVASIVE 0x02 /* not supported */
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#define RTNH_F_ONLINK 0x04 /* not supported */
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#define RTNH_F_OFFLOAD 0x08 /* not supported */
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#define RTNH_F_LINKDOWN 0x10 /* not supported */
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#define RTNH_F_UNRESOLVED 0x20 /* not supported */
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#define RTNH_F_TRAP 0x40 /* not supported */
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#define RTNH_COMPARE_MASK (RTNH_F_DEAD | RTNH_F_LINKDOWN | \
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RTNH_F_OFFLOAD | RTNH_F_TRAP)
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/* Macros to handle hexthops */
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#define RTNH_ALIGNTO NL_ITEM_ALIGN_SIZE
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#define RTNH_ALIGN(_len) NL_ITEM_ALIGN(_len)
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#define RTNH_HDRLEN ((int)sizeof(struct rtnexthop))
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#define _RTNH_LEN(_nh) ((int)(_nh)->rtnh_len)
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#define _RTNH_ALIGNED_LEN(_nh) RTNH_ALIGN(_RTNH_LEN(_nh))
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#define RTNH_OK(_nh, _len) NL_ITEM_OK(_nh, _len, RTNH_HDRLEN, _RTNH_LEN)
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#define RTNH_NEXT(_nh) ((struct rtnexthop *)((char *)(_nh) + _RTNH_ALIGNED_LEN(_nh)))
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#define RTNH_LENGTH(_len) (RTNH_HDRLEN + (_len))
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#define RTNH_SPACE(_len) RTNH_ALIGN(RTNH_LENGTH(_len))
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#define RTNH_DATA(_nh) ((struct rtattr *)NL_ITEM_DATA(_nh, RTNH_HDRLEN))
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struct rtgenmsg {
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unsigned char rtgen_family;
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};
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#endif
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