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route.h
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/* Copyright (C) 1997-2025 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ /* Based on the 4.4BSD and Linux version of this file. */ #ifndef _NET_ROUTE_H #define _NET_ROUTE_H 1 #include <features.h> #include <sys/socket.h> #include <sys/types.h> #include <netinet/in.h> #include <bits/wordsize.h> /* This structure gets passed by the SIOCADDRT and SIOCDELRT calls. */ struct rtentry { unsigned long int rt_pad1; struct sockaddr rt_dst; /* Target address. */ struct sockaddr rt_gateway; /* Gateway addr (RTF_GATEWAY). */ struct sockaddr rt_genmask; /* Target network mask (IP). */ unsigned short int rt_flags; short int rt_pad2; unsigned long int rt_pad3; unsigned char rt_tos; unsigned char rt_class; #if __WORDSIZE == 64 short int rt_pad4[3]; #else short int rt_pad4; #endif short int rt_metric; /* +1 for binary compatibility! */ char *rt_dev; /* Forcing the device at add. */ unsigned long int rt_mtu; /* Per route MTU/Window. */ unsigned long int rt_window; /* Window clamping. */ unsigned short int rt_irtt; /* Initial RTT. */ }; /* Compatibility hack. */ #define rt_mss rt_mtu struct in6_rtmsg { struct in6_addr rtmsg_dst; struct in6_addr rtmsg_src; struct in6_addr rtmsg_gateway; uint32_t rtmsg_type; uint16_t rtmsg_dst_len; uint16_t rtmsg_src_len; uint32_t rtmsg_metric; unsigned long int rtmsg_info; uint32_t rtmsg_flags; int rtmsg_ifindex; }; #define RTF_UP 0x0001 /* Route usable. */ #define RTF_GATEWAY 0x0002 /* Destination is a gateway. */ #define RTF_HOST 0x0004 /* Host entry (net otherwise). */ #define RTF_REINSTATE 0x0008 /* Reinstate route after timeout. */ #define RTF_DYNAMIC 0x0010 /* Created dyn. (by redirect). */ #define RTF_MODIFIED 0x0020 /* Modified dyn. (by redirect). */ #define RTF_MTU 0x0040 /* Specific MTU for this route. */ #define RTF_MSS RTF_MTU /* Compatibility. */ #define RTF_WINDOW 0x0080 /* Per route window clamping. */ #define RTF_IRTT 0x0100 /* Initial round trip time. */ #define RTF_REJECT 0x0200 /* Reject route. */ #define RTF_STATIC 0x0400 /* Manually injected route. */ #define RTF_XRESOLVE 0x0800 /* External resolver. */ #define RTF_NOFORWARD 0x1000 /* Forwarding inhibited. */ #define RTF_THROW 0x2000 /* Go to next class. */ #define RTF_NOPMTUDISC 0x4000 /* Do not send packets with DF. */ /* for IPv6 */ #define RTF_DEFAULT 0x00010000 /* default - learned via ND */ #define RTF_ALLONLINK 0x00020000 /* fallback, no routers on link */ #define RTF_ADDRCONF 0x00040000 /* addrconf route - RA */ #define RTF_LINKRT 0x00100000 /* link specific - device match */ #define RTF_NONEXTHOP 0x00200000 /* route with no nexthop */ #define RTF_CACHE 0x01000000 /* cache entry */ #define RTF_FLOW 0x02000000 /* flow significant route */ #define RTF_POLICY 0x04000000 /* policy route */ #define RTCF_VALVE 0x00200000 #define RTCF_MASQ 0x00400000 #define RTCF_NAT 0x00800000 #define RTCF_DOREDIRECT 0x01000000 #define RTCF_LOG 0x02000000 #define RTCF_DIRECTSRC 0x04000000 #define RTF_LOCAL 0x80000000 #define RTF_INTERFACE 0x40000000 #define RTF_MULTICAST 0x20000000 #define RTF_BROADCAST 0x10000000 #define RTF_NAT 0x08000000 #define RTF_ADDRCLASSMASK 0xF8000000 #define RT_ADDRCLASS(flags) ((uint32_t) flags >> 23) #define RT_TOS(tos) ((tos) & IPTOS_TOS_MASK) #define RT_LOCALADDR(flags) ((flags & RTF_ADDRCLASSMASK) \ == (RTF_LOCAL|RTF_INTERFACE)) #define RT_CLASS_UNSPEC 0 #define RT_CLASS_DEFAULT 253 #define RT_CLASS_MAIN 254 #define RT_CLASS_LOCAL 255 #define RT_CLASS_MAX 255 #define RTMSG_ACK NLMSG_ACK #define RTMSG_OVERRUN NLMSG_OVERRUN #define RTMSG_NEWDEVICE 0x11 #define RTMSG_DELDEVICE 0x12 #define RTMSG_NEWROUTE 0x21 #define RTMSG_DELROUTE 0x22 #define RTMSG_NEWRULE 0x31 #define RTMSG_DELRULE 0x32 #define RTMSG_CONTROL 0x40 #define RTMSG_AR_FAILED 0x51 /* Address Resolution failed. */ #endif /* net/route.h */