/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2022 Alexander V. Chernikov * * 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. */ /* * Route-related (RTM_ROUTE) message header and attributes. */ #ifndef _NETLINK_ROUTE_ROUTE_H_ #define _NETLINK_ROUTE_ROUTE_H_ /* Base header for all of the relevant messages */ struct rtmsg { unsigned char rtm_family; /* address family */ unsigned char rtm_dst_len; /* Prefix length */ unsigned char rtm_src_len; /* Source prefix length (not used) */ unsigned char rtm_tos; /* Type of service (not used) */ unsigned char rtm_table; /* rtable id */ unsigned char rtm_protocol; /* Routing protocol id (RTPROT_) */ unsigned char rtm_scope; /* Route distance (RT_SCOPE_) */ unsigned char rtm_type; /* Route type (RTN_) */ unsigned rtm_flags; /* Route flags (RTM_F_) */ }; /* * RFC 3549, 3.1.1, route type (rtm_type field). */ enum { RTN_UNSPEC, RTN_UNICAST, /* Unicast route */ RTN_LOCAL, /* Accept locally (not supported) */ RTN_BROADCAST, /* Accept locally as broadcast, send as broadcast */ RTN_ANYCAST, /* Accept locally as broadcast, but send as unicast */ RTN_MULTICAST, /* Multicast route */ RTN_BLACKHOLE, /* Drop traffic towards destination */ RTN_UNREACHABLE, /* Destination is unreachable */ RTN_PROHIBIT, /* Administratively prohibited */ RTN_THROW, /* Not in this table (not supported) */ RTN_NAT, /* Translate this address (not supported) */ RTN_XRESOLVE, /* Use external resolver (not supported) */ __RTN_MAX, }; #define RTN_MAX (__RTN_MAX - 1) /* * RFC 3549, 3.1.1, protocol (Identifies what/who added the route). * Values larger than RTPROT_STATIC(4) are not interpreted by the * kernel, they are just for user information. */ #define RTPROT_UNSPEC 0 #define RTPROT_REDIRECT 1 /* Route installed by ICMP redirect */ #define RTPROT_KERNEL 2 /* Route installed by kernel */ #define RTPROT_BOOT 3 /* Route installed during boot */ #define RTPROT_STATIC 4 /* Route installed by administrator */ #define RTPROT_GATED 8 #define RTPROT_RA 9 #define RTPROT_MRT 1 #define RTPROT_ZEBRA 11 #define RTPROT_BIRD 12 #define RTPROT_DNROUTED 13 #define RTPROT_XORP 14 #define RTPROT_NTK 15 #define RTPROT_DHCP 16 #define RTPROT_MROUTED 17 #define RTPROT_KEEPALIVED 18 #define RTPROT_BABEL 42 #define RTPROT_OPENR 99 #define RTPROT_BGP 186 #define RTPROT_ISIS 187 #define RTPROT_OSPF 188 #define RTPROT_RIP 189 #define RTPROT_EIGRP 192 /* * RFC 3549 3.1.1 Route scope (valid distance to destination). * * The values between RT_SCOPE_UNIVERSE(0) and RT_SCOPE_SITE(200) * are available to the user. */ enum rt_scope_t { RT_SCOPE_UNIVERSE = 0, /* User defined values */ RT_SCOPE_SITE = 200, RT_SCOPE_LINK = 253, RT_SCOPE_HOST = 254, RT_SCOPE_NOWHERE = 255 }; /* * RFC 3549 3.1.1 Route flags (rtm_flags). * Is a composition of RTNH_F flags (0x1..0x40 range), RTM_F flags (below) * and per-protocol (IPv4/IPv6) flags. */ #define RTM_F_NOTIFY 0x00000100 /* not supported */ #define RTM_F_CLONED 0x00000200 /* not supported */ #define RTM_F_EQUALIZE 0x00000400 /* not supported */ #define RTM_F_PREFIX 0x00000800 /* not supported */ #define RTM_F_LOOKUP_TABLE 0x00001000 /* not supported */ #define RTM_F_FIB_MATCH 0x00002000 /* not supported */ #define RTM_F_OFFLOAD 0x00004000 /* not supported */ #define RTM_F_TRAP 0x00008000 /* not supported */ #define RTM_F_OFFLOAD_FAILED 0x20000000 /* not supported */ /* Compatibility handling helpers */ #ifndef _KERNEL #define NL_RTM_HDRLEN ((int)sizeof(struct rtmsg)) #define RTM_RTA(_rtm) ((struct rtattr *)((char *)(_rtm) + NL_RTM_HDRLEN)) #define RTM_PAYLOAD(_hdr) NLMSG_PAYLOAD((_hdr), NL_RTM_HDRLEN) #endif /* * Routing table identifiers. * FreeBSD route table numbering starts from 0, where 0 is a valid default routing table. * Indicating "all tables" via netlink can be done by not including RTA_TABLE attribute * and keeping rtm_table=0 (compatibility) or setting RTA_TABLE value to RT_TABLE_UNSPEC. */ #define RT_TABLE_MAIN 0 /* RT_DEFAULT_FIB */ #define RT_TABLE_UNSPEC 0xFFFFFFFF /* RT_ALL_FIBS */ enum rtattr_type_t { NL_RTA_UNSPEC, NL_RTA_DST = 1, /* binary, IPv4/IPv6 destination */ NL_RTA_SRC = 2, /* binary, preferred source address */ NL_RTA_IIF = 3, /* not supported */ NL_RTA_OIF = 4, /* u32, transmit ifindex */ NL_RTA_GATEWAY = 5, /* binary: IPv4/IPv6 gateway */ NL_RTA_PRIORITY = 6, /* not supported */ NL_RTA_PREFSRC = 7, /* not supported */ NL_RTA_METRICS = 8, /* nested, list of NL_RTAX* attrs */ NL_RTA_MULTIPATH = 9, /* binary, array of struct rtnexthop */ NL_RTA_PROTOINFO = 10, /* not supported / deprecated */ NL_RTA_KNH_ID = 10, /* u32, FreeBSD specific, kernel nexthop index */ NL_RTA_FLOW = 11, /* not supported */ NL_RTA_CACHEINFO = 12, /* not supported */ NL_RTA_SESSION = 13, /* not supported / deprecated */ NL_RTA_WEIGHT = 13, /* u32, FreeBSD specific, path weight */ NL_RTA_MP_ALGO = 14, /* not supported / deprecated */ NL_RTA_RTFLAGS = 14, /* u32, FreeBSD specific, path flags (RTF_)*/ NL_RTA_TABLE = 15, /* u32, fibnum */ NL_RTA_MARK = 16, /* not supported */ NL_RTA_MFC_STATS = 17, /* not supported */ NL_RTA_VIA = 18, /* binary, struct rtvia */ NL_RTA_NEWDST = 19, /* not supported */ NL_RTA_PREF = 20, /* not supported */ NL_RTA_ENCAP_TYPE = 21, /* not supported */ NL_RTA_ENCAP = 22, /* not supported */ NL_RTA_EXPIRES = 23, /* u32, seconds till expiration */ NL_RTA_PAD = 24, /* not supported */ NL_RTA_UID = 25, /* not supported */ NL_RTA_TTL_PROPAGATE = 26, /* not supported */ NL_RTA_IP_PROTO = 27, /* not supported */ NL_RTA_SPORT = 28, /* not supported */ NL_RTA_DPORT = 29, /* not supported */ NL_RTA_NH_ID = 30, /* u32, nexthop/nexthop group index */ __RTA_MAX }; #define NL_RTA_MAX (__RTA_MAX - 1) /* * Attributes that can be used as filters: * */ #ifndef _KERNEL /* * RTA_* space has clashes with rtsock namespace. * Use NL_RTA_ prefix in the kernel and map to * RTA_ for userland. */ #define RTA_UNSPEC NL_RTA_UNSPEC #define RTA_DST NL_RTA_DST #define RTA_SRC NL_RTA_SRC #define RTA_IIF NL_RTA_IIF #define RTA_OIF NL_RTA_OIF #define RTA_GATEWAY NL_RTA_GATEWAY #define RTA_PRIORITY NL_RTA_PRIORITY #define RTA_PREFSRC NL_RTA_PREFSRC #define RTA_METRICS NL_RTA_METRICS #define RTA_MULTIPATH NL_RTA_MULTIPATH #define RTA_PROTOINFO NL_RTA_PROTOINFO #define RTA_KNH_ID NL_RTA_KNH_ID #define RTA_FLOW NL_RTA_FLOW #define RTA_CACHEINFO NL_RTA_CACHEINFO #define RTA_SESSION NL_RTA_SESSION #define RTA_MP_ALGO NL_RTA_MP_ALGO #define RTA_TABLE NL_RTA_TABLE #define RTA_MARK NL_RTA_MARK #define RTA_MFC_STATS NL_RTA_MFC_STATS #define RTA_VIA NL_RTA_VIA #define RTA_NEWDST NL_RTA_NEWDST #define RTA_PREF NL_RTA_PREF #define RTA_ENCAP_TYPE NL_RTA_ENCAP_TYPE #define RTA_ENCAP NL_RTA_ENCAP #define RTA_EXPIRES NL_RTA_EXPIRES #define RTA_PAD NL_RTA_PAD #define RTA_UID NL_RTA_UID #define RTA_TTL_PROPAGATE NL_RTA_TTL_PROPAGATE #define RTA_IP_PROTO NL_RTA_IP_PROTO #define RTA_SPORT NL_RTA_SPORT #define RTA_DPORT NL_RTA_DPORT #define RTA_NH_ID NL_RTA_NH_ID #define RTA_MAX NL_RTA_MAX #endif /* route attribute header */ struct rtattr { unsigned short rta_len; unsigned short rta_type; }; #define NL_RTA_ALIGN_SIZE NL_ITEM_ALIGN_SIZE #define NL_RTA_ALIGN NL_ITEM_ALIGN #define NL_RTA_HDRLEN ((int)sizeof(struct rtattr)) #define NL_RTA_DATA_LEN(_rta) ((int)((_rta)->rta_len - NL_RTA_HDRLEN)) #define NL_RTA_DATA(_rta) NL_ITEM_DATA(_rta, NL_RTA_HDRLEN) #define NL_RTA_DATA_CONST(_rta) NL_ITEM_DATA_CONST(_rta, NL_RTA_HDRLEN) /* Compatibility attribute handling helpers */ #ifndef _KERNEL #define RTA_ALIGNTO NL_RTA_ALIGN_SIZE #define RTA_ALIGN(_len) NL_RTA_ALIGN(_len) #define _RTA_LEN(_rta) ((int)(_rta)->rta_len) #define _RTA_ALIGNED_LEN(_rta) RTA_ALIGN(_RTA_LEN(_rta)) #define RTA_OK(_rta, _len) NL_ITEM_OK(_rta, _len, NL_RTA_HDRLEN, _RTA_LEN) #define RTA_NEXT(_rta, _len) NL_ITEM_ITER(_rta, _len, _RTA_ALIGNED_LEN) #define RTA_LENGTH(_len) (NL_RTA_HDRLEN + (_len)) #define RTA_SPACE(_len) RTA_ALIGN(RTA_LENGTH(_len)) #define RTA_DATA(_rta) NL_RTA_DATA(_rta) #define RTA_PAYLOAD(_rta) ((int)(_RTA_LEN(_rta) - NL_RTA_HDRLEN)) #endif /* RTA attribute headers */ /* RTA_VIA */ struct rtvia { sa_family_t rtvia_family; uint8_t rtvia_addr[0]; }; /* * RTA_METRICS is a nested attribute, consisting of a list of * TLVs with types defined below. */ enum { NL_RTAX_UNSPEC, NL_RTAX_LOCK = 1, /* not supported */ NL_RTAX_MTU = 2, /* desired path MTU */ NL_RTAX_WINDOW = 3, /* not supported */ NL_RTAX_RTT = 4, /* not supported */ NL_RTAX_RTTVAR = 5, /* not supported */ NL_RTAX_SSTHRESH = 6, /* not supported */ NL_RTAX_CWND = 7, /* not supported */ NL_RTAX_ADVMSS = 8, /* not supported */ NL_RTAX_REORDERING = 9, /* not supported */ NL_RTAX_HOPLIMIT = 10, /* not supported */ NL_RTAX_INITCWND = 11, /* not supporrted */ NL_RTAX_FEATURES = 12, /* not supported */ NL_RTAX_RTO_MIN = 13, /* not supported */ NL_RTAX_INITRWND = 14, /* not supported */ NL_RTAX_QUICKACK = 15, /* not supported */ NL_RTAX_CC_ALGO = 15, /* not supported */ NL_RTAX_FASTOPEN_NO_COOKIE = 16, /* not supported */ __NL_RTAX_MAX }; #define NL_RTAX_MAX (__NL_RTAX_MAX - 1) #define RTAX_FEATURE_ECN (1 << 0) #define RTAX_FEATURE_SACK (1 << 1) #define RTAX_FEATURE_TIMESTAMP (1 << 2) #define RTAX_FEATURE_ALLFRAG (1 << 3) #define RTAX_FEATURE_MASK \ (RTAX_FEATURE_ECN | RTAX_FEATURE_SACK | RTAX_FEATURE_TIMESTAMP | \ RTAX_FEATURE_ALLFRAG) #ifndef _KERNEL /* * RTAX_* space clashes with rtsock namespace. * Use NL_RTAX_ prefix in the kernel and map to * RTAX_ for userland. */ #define RTAX_UNSPEC NL_RTAX_UNSPEC #define RTAX_LOCK NL_RTAX_LOCK #define RTAX_MTU NL_RTAX_MTU #define RTAX_WINDOW NL_RTAX_WINDOW #define RTAX_RTT NL_RTAX_RTT #define RTAX_RTTVAR NL_RTAX_RTTVAR #define RTAX_SSTHRESH NL_RTAX_SSTHRESH #define RTAX_CWND NL_RTAX_CWND #define RTAX_ADVMSS NL_RTAX_ADVMSS #define RTAX_REORDERING NL_RTAX_REORDERING #define RTAX_HOPLIMIT NL_RTAX_HOPLIMIT #define RTAX_INITCWND NL_RTAX_INITCWND #define RTAX_FEATURES NL_RTAX_FEATURES #define RTAX_RTO_MIN NL_RTAX_RTO_MIN #define RTAX_INITRWND NL_RTAX_INITRWND #define RTAX_QUICKACK NL_RTAX_QUICKACK #define RTAX_CC_ALGO NL_RTAX_CC_ALGO #define RTAX_FASTOPEN_NO_COOKIE NL_RTAX_FASTOPEN_NO_COOKIE #endif /* * RTA_MULTIPATH consists of an array of rtnexthop structures. * Each rtnexthop structure contains RTA_GATEWAY or RTA_VIA * attribute following the header. */ struct rtnexthop { unsigned short rtnh_len; unsigned char rtnh_flags; unsigned char rtnh_hops; /* nexthop weight */ int rtnh_ifindex; }; /* rtnh_flags */ #define RTNH_F_DEAD 0x01 /* not supported */ #define RTNH_F_PERVASIVE 0x02 /* not supported */ #define RTNH_F_ONLINK 0x04 /* not supported */ #define RTNH_F_OFFLOAD 0x08 /* not supported */ #define RTNH_F_LINKDOWN 0x10 /* not supported */ #define RTNH_F_UNRESOLVED 0x20 /* not supported */ #define RTNH_F_TRAP 0x40 /* not supported */ #define RTNH_COMPARE_MASK (RTNH_F_DEAD | RTNH_F_LINKDOWN | \ RTNH_F_OFFLOAD | RTNH_F_TRAP) /* Macros to handle hexthops */ #define RTNH_ALIGNTO NL_ITEM_ALIGN_SIZE #define RTNH_ALIGN(_len) NL_ITEM_ALIGN(_len) #define RTNH_HDRLEN ((int)sizeof(struct rtnexthop)) #define _RTNH_LEN(_nh) ((int)(_nh)->rtnh_len) #define _RTNH_ALIGNED_LEN(_nh) RTNH_ALIGN(_RTNH_LEN(_nh)) #define RTNH_OK(_nh, _len) NL_ITEM_OK(_nh, _len, RTNH_HDRLEN, _RTNH_LEN) #define RTNH_NEXT(_nh) ((struct rtnexthop *)((char *)(_nh) + _RTNH_ALIGNED_LEN(_nh))) #define RTNH_LENGTH(_len) (RTNH_HDRLEN + (_len)) #define RTNH_SPACE(_len) RTNH_ALIGN(RTNH_LENGTH(_len)) #define RTNH_DATA(_nh) ((struct rtattr *)NL_ITEM_DATA(_nh, RTNH_HDRLEN)) struct rtgenmsg { unsigned char rtgen_family; }; #endif