cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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dns_resolver.h (3904B)

      1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
      2/* DNS resolver interface definitions.
      3 *
      4 * Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
      5 * Written by David Howells (dhowells@redhat.com)
      6 *
      7 * This program is free software; you can redistribute it and/or
      8 * modify it under the terms of the GNU General Public Licence
      9 * as published by the Free Software Foundation; either version
     10 * 2 of the Licence, or (at your option) any later version.
     11 */
     12
     13#ifndef _UAPI_LINUX_DNS_RESOLVER_H
     14#define _UAPI_LINUX_DNS_RESOLVER_H
     15
     16#include <linux/types.h>
     17
     18/*
     19 * Type of payload.
     20 */
     21enum dns_payload_content_type {
     22	DNS_PAYLOAD_IS_SERVER_LIST	= 0, /* List of servers, requested by srv=1 */
     23};
     24
     25/*
     26 * Type of address that might be found in an address record.
     27 */
     28enum dns_payload_address_type {
     29	DNS_ADDRESS_IS_IPV4		= 0, /* 4-byte AF_INET address */
     30	DNS_ADDRESS_IS_IPV6		= 1, /* 16-byte AF_INET6 address */
     31};
     32
     33/*
     34 * Type of protocol used to access a server.
     35 */
     36enum dns_payload_protocol_type {
     37	DNS_SERVER_PROTOCOL_UNSPECIFIED	= 0,
     38	DNS_SERVER_PROTOCOL_UDP		= 1, /* Use UDP to talk to the server */
     39	DNS_SERVER_PROTOCOL_TCP		= 2, /* Use TCP to talk to the server */
     40};
     41
     42/*
     43 * Source of record included in DNS resolver payload.
     44 */
     45enum dns_record_source {
     46	DNS_RECORD_UNAVAILABLE		= 0, /* No source available (empty record) */
     47	DNS_RECORD_FROM_CONFIG		= 1, /* From local configuration data */
     48	DNS_RECORD_FROM_DNS_A		= 2, /* From DNS A or AAAA record */
     49	DNS_RECORD_FROM_DNS_AFSDB	= 3, /* From DNS AFSDB record */
     50	DNS_RECORD_FROM_DNS_SRV		= 4, /* From DNS SRV record */
     51	DNS_RECORD_FROM_NSS		= 5, /* From NSS */
     52	NR__dns_record_source
     53};
     54
     55/*
     56 * Status of record included in DNS resolver payload.
     57 */
     58enum dns_lookup_status {
     59	DNS_LOOKUP_NOT_DONE		= 0, /* No lookup has been made */
     60	DNS_LOOKUP_GOOD			= 1, /* Good records obtained */
     61	DNS_LOOKUP_GOOD_WITH_BAD	= 2, /* Good records, some decoding errors */
     62	DNS_LOOKUP_BAD			= 3, /* Couldn't decode results */
     63	DNS_LOOKUP_GOT_NOT_FOUND	= 4, /* Got a "Not Found" result */
     64	DNS_LOOKUP_GOT_LOCAL_FAILURE	= 5, /* Local failure during lookup */
     65	DNS_LOOKUP_GOT_TEMP_FAILURE	= 6, /* Temporary failure during lookup */
     66	DNS_LOOKUP_GOT_NS_FAILURE	= 7, /* Name server failure */
     67	NR__dns_lookup_status
     68};
     69
     70/*
     71 * Header at the beginning of binary format payload.
     72 */
     73struct dns_payload_header {
     74	__u8		zero;		/* Zero byte: marks this as not being text */
     75	__u8		content;	/* enum dns_payload_content_type */
     76	__u8		version;	/* Encoding version */
     77} __packed;
     78
     79/*
     80 * Header at the beginning of a V1 server list.  This is followed directly by
     81 * the server records.  Each server records begins with a struct of type
     82 * dns_server_list_v1_server.
     83 */
     84struct dns_server_list_v1_header {
     85	struct dns_payload_header hdr;
     86	__u8		source;		/* enum dns_record_source */
     87	__u8		status;		/* enum dns_lookup_status */
     88	__u8		nr_servers;	/* Number of server records following this */
     89} __packed;
     90
     91/*
     92 * Header at the beginning of each V1 server record.  This is followed by the
     93 * characters of the name with no NUL-terminator, followed by the address
     94 * records for that server.  Each address record begins with a struct of type
     95 * struct dns_server_list_v1_address.
     96 */
     97struct dns_server_list_v1_server {
     98	__u16		name_len;	/* Length of name (LE) */
     99	__u16		priority;	/* Priority (as SRV record) (LE) */
    100	__u16		weight;		/* Weight (as SRV record) (LE) */
    101	__u16		port;		/* UDP/TCP port number (LE) */
    102	__u8		source;		/* enum dns_record_source */
    103	__u8		status;		/* enum dns_lookup_status */
    104	__u8		protocol;	/* enum dns_payload_protocol_type */
    105	__u8		nr_addrs;
    106} __packed;
    107
    108/*
    109 * Header at the beginning of each V1 address record.  This is followed by the
    110 * bytes of the address, 4 for IPV4 and 16 for IPV6.
    111 */
    112struct dns_server_list_v1_address {
    113	__u8		address_type;	/* enum dns_payload_address_type */
    114} __packed;
    115
    116#endif /* _UAPI_LINUX_DNS_RESOLVER_H */