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ip.h
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/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ /* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Definitions for the IP protocol. * * Version: @(#)ip.h 1.0.2 04/28/93 * * Authors: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #ifndef _LINUX_IP_H #define _LINUX_IP_H #include <linux/types.h> #include <linux/stddef.h> #include <asm/byteorder.h> #define IPTOS_TOS_MASK 0x1E #define IPTOS_TOS(tos) ((tos)&IPTOS_TOS_MASK) #define IPTOS_LOWDELAY 0x10 #define IPTOS_THROUGHPUT 0x08 #define IPTOS_RELIABILITY 0x04 #define IPTOS_MINCOST 0x02 #define IPTOS_PREC_MASK 0xE0 #define IPTOS_PREC(tos) ((tos)&IPTOS_PREC_MASK) #define IPTOS_PREC_NETCONTROL 0xe0 #define IPTOS_PREC_INTERNETCONTROL 0xc0 #define IPTOS_PREC_CRITIC_ECP 0xa0 #define IPTOS_PREC_FLASHOVERRIDE 0x80 #define IPTOS_PREC_FLASH 0x60 #define IPTOS_PREC_IMMEDIATE 0x40 #define IPTOS_PREC_PRIORITY 0x20 #define IPTOS_PREC_ROUTINE 0x00 /* IP options */ #define IPOPT_COPY 0x80 #define IPOPT_CLASS_MASK 0x60 #define IPOPT_NUMBER_MASK 0x1f #define IPOPT_COPIED(o) ((o)&IPOPT_COPY) #define IPOPT_CLASS(o) ((o)&IPOPT_CLASS_MASK) #define IPOPT_NUMBER(o) ((o)&IPOPT_NUMBER_MASK) #define IPOPT_CONTROL 0x00 #define IPOPT_RESERVED1 0x20 #define IPOPT_MEASUREMENT 0x40 #define IPOPT_RESERVED2 0x60 #define IPOPT_END (0 |IPOPT_CONTROL) #define IPOPT_NOOP (1 |IPOPT_CONTROL) #define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY) #define IPOPT_LSRR (3 |IPOPT_CONTROL|IPOPT_COPY) #define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT) #define IPOPT_CIPSO (6 |IPOPT_CONTROL|IPOPT_COPY) #define IPOPT_RR (7 |IPOPT_CONTROL) #define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY) #define IPOPT_SSRR (9 |IPOPT_CONTROL|IPOPT_COPY) #define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY) #define IPVERSION 4 #define MAXTTL 255 #define IPDEFTTL 64 #define IPOPT_OPTVAL 0 #define IPOPT_OLEN 1 #define IPOPT_OFFSET 2 #define IPOPT_MINOFF 4 #define MAX_IPOPTLEN 40 #define IPOPT_NOP IPOPT_NOOP #define IPOPT_EOL IPOPT_END #define IPOPT_TS IPOPT_TIMESTAMP #define IPOPT_TS_TSONLY 0 /* timestamps only */ #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ #define IPOPT_TS_PRESPEC 3 /* specified modules only */ #define IPV4_BEET_PHMAXLEN 8 struct iphdr { #if defined(__LITTLE_ENDIAN_BITFIELD) __u8 ihl:4, version:4; #elif defined (__BIG_ENDIAN_BITFIELD) __u8 version:4, ihl:4; #else #error "Please fix <asm/byteorder.h>" #endif __u8 tos; __be16 tot_len; __be16 id; __be16 frag_off; __u8 ttl; __u8 protocol; __sum16 check; __struct_group(/* no tag */, addrs, /* no attrs */, __be32 saddr; __be32 daddr; ); /*The options start here. */ }; struct ip_auth_hdr { __u8 nexthdr; __u8 hdrlen; /* This one is measured in 32 bit units! */ __be16 reserved; __be32 spi; __be32 seq_no; /* Sequence number */ __u8 auth_data[]; /* Variable len but >=4. Mind the 64 bit alignment! */ }; struct ip_esp_hdr { __be32 spi; __be32 seq_no; /* Sequence number */ __u8 enc_data[]; /* Variable len but >=8. Mind the 64 bit alignment! */ }; struct ip_comp_hdr { __u8 nexthdr; __u8 flags; __be16 cpi; }; struct ip_beet_phdr { __u8 nexthdr; __u8 hdrlen; __u8 padlen; __u8 reserved; }; /* index values for the variables in ipv4_devconf */ enum { IPV4_DEVCONF_FORWARDING=1, IPV4_DEVCONF_MC_FORWARDING, IPV4_DEVCONF_PROXY_ARP, IPV4_DEVCONF_ACCEPT_REDIRECTS, IPV4_DEVCONF_SECURE_REDIRECTS, IPV4_DEVCONF_SEND_REDIRECTS, IPV4_DEVCONF_SHARED_MEDIA, IPV4_DEVCONF_RP_FILTER, IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE, IPV4_DEVCONF_BOOTP_RELAY, IPV4_DEVCONF_LOG_MARTIANS, IPV4_DEVCONF_TAG, IPV4_DEVCONF_ARPFILTER, IPV4_DEVCONF_MEDIUM_ID, IPV4_DEVCONF_NOXFRM, IPV4_DEVCONF_NOPOLICY, IPV4_DEVCONF_FORCE_IGMP_VERSION, IPV4_DEVCONF_ARP_ANNOUNCE, IPV4_DEVCONF_ARP_IGNORE, IPV4_DEVCONF_PROMOTE_SECONDARIES, IPV4_DEVCONF_ARP_ACCEPT, IPV4_DEVCONF_ARP_NOTIFY, IPV4_DEVCONF_ACCEPT_LOCAL, IPV4_DEVCONF_SRC_VMARK, IPV4_DEVCONF_PROXY_ARP_PVLAN, IPV4_DEVCONF_ROUTE_LOCALNET, IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL, IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL, IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN, IPV4_DEVCONF_DROP_UNICAST_IN_L2_MULTICAST, IPV4_DEVCONF_DROP_GRATUITOUS_ARP, IPV4_DEVCONF_BC_FORWARDING, IPV4_DEVCONF_ARP_EVICT_NOCARRIER, __IPV4_DEVCONF_MAX }; #define IPV4_DEVCONF_MAX (__IPV4_DEVCONF_MAX - 1) #endif /* _LINUX_IP_H */