1/* Copyright (C) 1997-2026 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18/* Based on the 4.4BSD and Linux version of this file. */
19
20#ifndef _NET_ROUTE_H
21#define _NET_ROUTE_H 1
22
23#include <features.h>
24#include <sys/socket.h>
25#include <sys/types.h>
26#include <netinet/in.h>
27#include <bits/wordsize.h>
28
29
30/* This structure gets passed by the SIOCADDRT and SIOCDELRT calls. */
31struct rtentry
32 {
33 unsigned long int rt_pad1;
34 struct sockaddr rt_dst; /* Target address. */
35 struct sockaddr rt_gateway; /* Gateway addr (RTF_GATEWAY). */
36 struct sockaddr rt_genmask; /* Target network mask (IP). */
37 unsigned short int rt_flags;
38 short int rt_pad2;
39 unsigned long int rt_pad3;
40 unsigned char rt_tos;
41 unsigned char rt_class;
42#if __WORDSIZE == 64
43 short int rt_pad4[3];
44#else
45 short int rt_pad4;
46#endif
47 short int rt_metric; /* +1 for binary compatibility! */
48 char *rt_dev; /* Forcing the device at add. */
49 unsigned long int rt_mtu; /* Per route MTU/Window. */
50 unsigned long int rt_window; /* Window clamping. */
51 unsigned short int rt_irtt; /* Initial RTT. */
52 };
53/* Compatibility hack. */
54#define rt_mss rt_mtu
55
56
57struct in6_rtmsg
58 {
59 struct in6_addr rtmsg_dst;
60 struct in6_addr rtmsg_src;
61 struct in6_addr rtmsg_gateway;
62 uint32_t rtmsg_type;
63 uint16_t rtmsg_dst_len;
64 uint16_t rtmsg_src_len;
65 uint32_t rtmsg_metric;
66 unsigned long int rtmsg_info;
67 uint32_t rtmsg_flags;
68 int rtmsg_ifindex;
69 };
70
71
72#define RTF_UP 0x0001 /* Route usable. */
73#define RTF_GATEWAY 0x0002 /* Destination is a gateway. */
74
75#define RTF_HOST 0x0004 /* Host entry (net otherwise). */
76#define RTF_REINSTATE 0x0008 /* Reinstate route after timeout. */
77#define RTF_DYNAMIC 0x0010 /* Created dyn. (by redirect). */
78#define RTF_MODIFIED 0x0020 /* Modified dyn. (by redirect). */
79#define RTF_MTU 0x0040 /* Specific MTU for this route. */
80#define RTF_MSS RTF_MTU /* Compatibility. */
81#define RTF_WINDOW 0x0080 /* Per route window clamping. */
82#define RTF_IRTT 0x0100 /* Initial round trip time. */
83#define RTF_REJECT 0x0200 /* Reject route. */
84#define RTF_STATIC 0x0400 /* Manually injected route. */
85#define RTF_XRESOLVE 0x0800 /* External resolver. */
86#define RTF_NOFORWARD 0x1000 /* Forwarding inhibited. */
87#define RTF_THROW 0x2000 /* Go to next class. */
88#define RTF_NOPMTUDISC 0x4000 /* Do not send packets with DF. */
89
90/* for IPv6 */
91#define RTF_DEFAULT 0x00010000 /* default - learned via ND */
92#define RTF_ALLONLINK 0x00020000 /* fallback, no routers on link */
93#define RTF_ADDRCONF 0x00040000 /* addrconf route - RA */
94
95#define RTF_LINKRT 0x00100000 /* link specific - device match */
96#define RTF_NONEXTHOP 0x00200000 /* route with no nexthop */
97
98#define RTF_CACHE 0x01000000 /* cache entry */
99#define RTF_FLOW 0x02000000 /* flow significant route */
100#define RTF_POLICY 0x04000000 /* policy route */
101
102#define RTCF_VALVE 0x00200000
103#define RTCF_MASQ 0x00400000
104#define RTCF_NAT 0x00800000
105#define RTCF_DOREDIRECT 0x01000000
106#define RTCF_LOG 0x02000000
107#define RTCF_DIRECTSRC 0x04000000
108
109#define RTF_LOCAL 0x80000000
110#define RTF_INTERFACE 0x40000000
111#define RTF_MULTICAST 0x20000000
112#define RTF_BROADCAST 0x10000000
113#define RTF_NAT 0x08000000
114
115#define RTF_ADDRCLASSMASK 0xF8000000
116#define RT_ADDRCLASS(flags) ((uint32_t) flags >> 23)
117
118#define RT_TOS(tos) ((tos) & IPTOS_TOS_MASK)
119
120#define RT_LOCALADDR(flags) ((flags & RTF_ADDRCLASSMASK) \
121 == (RTF_LOCAL|RTF_INTERFACE))
122
123#define RT_CLASS_UNSPEC 0
124#define RT_CLASS_DEFAULT 253
125
126#define RT_CLASS_MAIN 254
127#define RT_CLASS_LOCAL 255
128#define RT_CLASS_MAX 255
129
130
131#define RTMSG_ACK NLMSG_ACK
132#define RTMSG_OVERRUN NLMSG_OVERRUN
133
134#define RTMSG_NEWDEVICE 0x11
135#define RTMSG_DELDEVICE 0x12
136#define RTMSG_NEWROUTE 0x21
137#define RTMSG_DELROUTE 0x22
138#define RTMSG_NEWRULE 0x31
139#define RTMSG_DELRULE 0x32
140#define RTMSG_CONTROL 0x40
141
142#define RTMSG_AR_FAILED 0x51 /* Address Resolution failed. */
143
144#endif /* net/route.h */