X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=src%2Finclude%2Fgnunet_tun_lib.h;h=11c43e8b74b80b6ad21461d4f5c94b31c18e2e7a;hb=6e626937fd5133188d2bd06f280a1b889219eef2;hp=8383da0c3019c9ef31f3545697262b8dbe1d5958;hpb=15bb58cddfc10126f3345d18802d28b56d572f35;p=oweals%2Fgnunet.git diff --git a/src/include/gnunet_tun_lib.h b/src/include/gnunet_tun_lib.h index 8383da0c3..11c43e8b7 100644 --- a/src/include/gnunet_tun_lib.h +++ b/src/include/gnunet_tun_lib.h @@ -1,33 +1,39 @@ /* This file is part of GNUnet. - (C) 2010-2013 Christian Grothoff + Copyright (C) 2010-2013 Christian Grothoff - GNUnet 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 3, or (at your - option) any later version. + GNUnet is free software: you can redistribute it and/or modify it + under the terms of the GNU Affero General Public License as published + by the Free Software Foundation, either version 3 of the License, + or (at your option) any later version. GNUnet 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 - General Public License for more details. + Affero General Public License for more details. + + You should have received a copy of the GNU Affero General Public License + along with this program. If not, see . - You should have received a copy of the GNU General Public License - along with GNUnet; see the file COPYING. If not, write to the - Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. + SPDX-License-Identifier: AGPL3.0-or-later */ /** - * @file include/gnunet_tun_lib.h - * @brief standard TCP/IP network structs and IP checksum calculations for TUN interaction * @author Philipp Toelke * @author Christian Grothoff + * + * @file + * Standard TCP/IP network structs and IP checksum calculations for TUN interaction + * + * @defgroup tun TUN library + * Standard TCP/IP network structs and IP checksum calculations for TUN interaction + * @{ */ #ifndef GNUNET_TUN_LIB_H #define GNUNET_TUN_LIB_H -#include "gnunet_util_lib.h" +#include "gnunet_common.h" +#include "gnunet_crypto_lib.h" /* see http://www.iana.org/assignments/ethernet-numbers */ @@ -47,27 +53,34 @@ /** - * Maximum regex string length for use with GNUNET_TUN_ipv4toregexsearch + * Maximum regex string length for use with #GNUNET_TUN_ipv4toregexsearch. + * + * 8 bytes for IPv4, 4 bytes for port, 1 byte for "4", 2 bytes for "-", + * one byte for 0-termination. */ -#define GNUNET_TUN_IPV4_REGEXLEN 32 + 6 + +#define GNUNET_TUN_IPV4_REGEXLEN 16 /** - * Maximum regex string length for use with GNUNET_TUN_ipv6toregexsearch + * Maximum regex string length for use with #GNUNET_TUN_ipv6toregexsearch + * + * 32 bytes for IPv4, 4 bytes for port, 1 byte for "4", 2 bytes for "-", + * one byte for 0-termination. */ -#define GNUNET_TUN_IPV6_REGEXLEN 128 + 6 +#define GNUNET_TUN_IPV6_REGEXLEN 40 GNUNET_NETWORK_STRUCT_BEGIN /** * Header from Linux TUN interface. - */ + */ struct GNUNET_TUN_Layer2PacketHeader { /** * Some flags (unused). - */ + */ uint16_t flags GNUNET_PACKED; /** @@ -97,7 +110,7 @@ struct GNUNET_TUN_IPv4Header * Length of the packet, including this header. */ uint16_t total_length GNUNET_PACKED; - + /** * Unique random ID for matching up fragments. */ @@ -124,12 +137,12 @@ struct GNUNET_TUN_IPv4Header /** * Origin of the packet. - */ + */ struct in_addr source_address GNUNET_PACKED; /** * Destination of the packet. - */ + */ struct in_addr destination_address GNUNET_PACKED; } GNUNET_GCC_STRUCT_LAYOUT; @@ -168,16 +181,28 @@ struct GNUNET_TUN_IPv6Header /** * Origin of the packet. - */ + */ struct in6_addr source_address GNUNET_PACKED; /** * Destination of the packet. - */ + */ struct in6_addr destination_address GNUNET_PACKED; } GNUNET_GCC_STRUCT_LAYOUT; +/** + * TCP flags. + */ +#define GNUNET_TUN_TCP_FLAGS_FIN 1 +#define GNUNET_TUN_TCP_FLAGS_SYN 2 +#define GNUNET_TUN_TCP_FLAGS_RST 4 +#define GNUNET_TUN_TCP_FLAGS_PSH 8 +#define GNUNET_TUN_TCP_FLAGS_ACK 16 +#define GNUNET_TUN_TCP_FLAGS_URG 32 +#define GNUNET_TUN_TCP_FLAGS_ECE 64 +#define GNUNET_TUN_TCP_FLAGS_CWR 128 + /** * TCP packet header. */ @@ -222,7 +247,7 @@ struct GNUNET_TUN_TcpHeader unsigned int reserved : 4 GNUNET_PACKED; #else #error byteorder undefined -#endif +#endif /** * Flags (SYN, FIN, ACK, etc.) @@ -316,108 +341,108 @@ struct GNUNET_TUN_DnsFlags /** * Set to 1 if recursion is desired (client -> server) */ - unsigned int recursion_desired : 1 GNUNET_PACKED; - + unsigned int recursion_desired : 1 GNUNET_PACKED; + /** * Set to 1 if message is truncated */ - unsigned int message_truncated : 1 GNUNET_PACKED; - + unsigned int message_truncated : 1 GNUNET_PACKED; + /** * Set to 1 if this is an authoritative answer */ unsigned int authoritative_answer : 1 GNUNET_PACKED; - + /** * See GNUNET_TUN_DNS_OPCODE_ defines. */ - unsigned int opcode : 4 GNUNET_PACKED; - + unsigned int opcode : 4 GNUNET_PACKED; + /** * query:0, response:1 */ - unsigned int query_or_response : 1 GNUNET_PACKED; - + unsigned int query_or_response : 1 GNUNET_PACKED; + /** * See GNUNET_TUN_DNS_RETURN_CODE_ defines. */ - unsigned int return_code : 4 GNUNET_PACKED; - + unsigned int return_code : 4 GNUNET_PACKED; + /** * See RFC 4035. */ - unsigned int checking_disabled : 1 GNUNET_PACKED; - + unsigned int checking_disabled : 1 GNUNET_PACKED; + /** * Response has been cryptographically verified, RFC 4035. */ unsigned int authenticated_data : 1 GNUNET_PACKED; - + /** * Always zero. */ unsigned int zero : 1 GNUNET_PACKED; - + /** * Set to 1 if recursion is available (server -> client) */ - unsigned int recursion_available : 1 GNUNET_PACKED; + unsigned int recursion_available : 1 GNUNET_PACKED; #elif __BYTE_ORDER == __BIG_ENDIAN - + /** * query:0, response:1 */ - unsigned int query_or_response : 1 GNUNET_PACKED; - + unsigned int query_or_response : 1 GNUNET_PACKED; + /** * See GNUNET_TUN_DNS_OPCODE_ defines. */ - unsigned int opcode : 4 GNUNET_PACKED; - + unsigned int opcode : 4 GNUNET_PACKED; + /** * Set to 1 if this is an authoritative answer */ unsigned int authoritative_answer : 1 GNUNET_PACKED; - + /** * Set to 1 if message is truncated */ - unsigned int message_truncated : 1 GNUNET_PACKED; - + unsigned int message_truncated : 1 GNUNET_PACKED; + /** * Set to 1 if recursion is desired (client -> server) */ - unsigned int recursion_desired : 1 GNUNET_PACKED; + unsigned int recursion_desired : 1 GNUNET_PACKED; + - /** * Set to 1 if recursion is available (server -> client) */ unsigned int recursion_available : 1 GNUNET_PACKED; - + /** * Always zero. */ unsigned int zero : 1 GNUNET_PACKED; - + /** * Response has been cryptographically verified, RFC 4035. */ unsigned int authenticated_data : 1 GNUNET_PACKED; - + /** * See RFC 4035. */ - unsigned int checking_disabled : 1 GNUNET_PACKED; - + unsigned int checking_disabled : 1 GNUNET_PACKED; + /** * See GNUNET_TUN_DNS_RETURN_CODE_ defines. - */ - unsigned int return_code : 4 GNUNET_PACKED; + */ + unsigned int return_code : 4 GNUNET_PACKED; #else #error byteorder undefined #endif - + } GNUNET_GCC_STRUCT_LAYOUT; @@ -468,18 +493,18 @@ struct GNUNET_TUN_DnsSoaRecord * The version number of the original copy of the zone. (NBO) */ uint32_t serial GNUNET_PACKED; - + /** * Time interval before the zone should be refreshed. (NBO) */ uint32_t refresh GNUNET_PACKED; - + /** * Time interval that should elapse before a failed refresh should * be retried. (NBO) */ uint32_t retry GNUNET_PACKED; - + /** * Time value that specifies the upper limit on the time interval * that can elapse before the zone is no longer authoritative. (NBO) @@ -523,6 +548,31 @@ struct GNUNET_TUN_DnsSrvRecord }; +/** + * Payload of DNS CERT record. + */ +struct GNUNET_TUN_DnsCertRecord +{ + + /** + * Certificate type + */ + uint16_t cert_type; + + /** + * Certificate KeyTag + */ + uint16_t cert_tag; + + /** + * Algorithm + */ + uint8_t algorithm; + + /* Followed by the certificate */ +}; + + /** * Payload of DNSSEC TLSA record. * http://datatracker.ietf.org/doc/draft-ietf-dane-protocol/ @@ -588,6 +638,7 @@ struct GNUNET_TUN_GnsVpnRecord /* followed by the servicename */ }; + /** * DNS query prefix. */ @@ -601,7 +652,7 @@ struct GNUNET_TUN_DnsQueryLine /** * Desired class (usually GNUNET_TUN_DNS_CLASS_INTERNET). (NBO) */ - uint16_t class GNUNET_PACKED; + uint16_t dns_traffic_class GNUNET_PACKED; }; @@ -618,7 +669,7 @@ struct GNUNET_TUN_DnsRecordLine /** * Record class (usually GNUNET_TUN_DNS_CLASS_INTERNET). (NBO) */ - uint16_t class GNUNET_PACKED; + uint16_t dns_traffic_class GNUNET_PACKED; /** * Expiration for the record (in seconds). (NBO) @@ -652,33 +703,37 @@ struct GNUNET_TUN_DnsRecordLine /** * ICMP header. */ -struct GNUNET_TUN_IcmpHeader { - uint8_t type; - uint8_t code; +struct GNUNET_TUN_IcmpHeader +{ + uint8_t type; + uint8_t code; uint16_t crc GNUNET_PACKED; - union { + union + { /** - * ICMP Echo (request/reply) + * ICMP Echo (request/reply) */ - struct { + struct + { uint16_t identifier GNUNET_PACKED; uint16_t sequence_number GNUNET_PACKED; } echo; /** - * ICMP Destination Unreachable (RFC 1191) + * ICMP Destination Unreachable (RFC 1191) */ - struct ih_pmtu { + struct ih_pmtu + { uint16_t empty GNUNET_PACKED; uint16_t next_hop_mtu GNUNET_PACKED; /* followed by original IP header + first 8 bytes of original IP datagram */ } destination_unreachable; /** - * ICMP Redirect - */ - struct in_addr redirect_gateway_address GNUNET_PACKED; + * ICMP Redirect + */ + struct in_addr redirect_gateway_address GNUNET_PACKED; /** * MTU for packets that are too big (IPv6). @@ -775,7 +830,7 @@ GNUNET_TUN_calculate_udp4_checksum (const struct GNUNET_TUN_IPv4Header *ip, * @param ip ipv6 header fully initialized * @param udp UDP header (initialized except for CRC) * @param payload the UDP payload - * @param payload_length number of bytes of UDP payload + * @param payload_length number of bytes of @a payload */ void GNUNET_TUN_calculate_udp6_checksum (const struct GNUNET_TUN_IPv6Header *ip, @@ -789,7 +844,7 @@ GNUNET_TUN_calculate_udp6_checksum (const struct GNUNET_TUN_IPv6Header *ip, * * @param icmp IMCP header (initialized except for CRC) * @param payload the ICMP payload - * @param payload_length number of bytes of ICMP payload + * @param payload_length number of bytes of @a payload */ void GNUNET_TUN_calculate_icmp_checksum (struct GNUNET_TUN_IcmpHeader *icmp, @@ -798,29 +853,31 @@ GNUNET_TUN_calculate_icmp_checksum (struct GNUNET_TUN_IcmpHeader *icmp, /** - * Create a regex in @a rxstr from the given @a ip and @a netmask. + * Create a regex in @a rxstr from the given @a ip and @a port. * * @param ip IPv4 representation. - * @param netmask netmask for the ip. + * @param port destination port * @param rxstr generated regex, must be at least #GNUNET_TUN_IPV4_REGEXLEN * bytes long. */ void -GNUNET_TUN_ipv4toregexsearch (const struct in_addr *ip, const char *netmask, - char *rxstr); +GNUNET_TUN_ipv4toregexsearch (const struct in_addr *ip, + uint16_t port, + char *rxstr); /** - * Create a regex in @a rxstr from the given @a ipv6 and @a prefixlen. + * Create a regex in @a rxstr from the given @a ipv6 and @a port. * * @param ipv6 IPv6 representation. - * @param prefixlen length of the ipv6 prefix. + * @param port destination port * @param rxstr generated regex, must be at least #GNUNET_TUN_IPV6_REGEXLEN * bytes long. */ void GNUNET_TUN_ipv6toregexsearch (const struct in6_addr *ipv6, - unsigned int prefixlen, char *rxstr); + uint16_t port, + char *rxstr); /** @@ -849,4 +906,47 @@ char * GNUNET_TUN_ipv4policy2regex (const char *policy); +/** + * Hash the service name of a hosted service to the + * hash code that is used to identify the service on + * the network. + * + * @param service_name a string + * @param[out] hc corresponding hash + */ +void +GNUNET_TUN_service_name_to_hash (const char *service_name, + struct GNUNET_HashCode *hc); + + +/** + * Check if two sockaddrs are equal. + * + * @param sa one address + * @param sb another address + * @param include_port also check ports + * @return #GNUNET_YES if they are equal + */ +int +GNUNET_TUN_sockaddr_cmp (const struct sockaddr *sa, + const struct sockaddr *sb, + int include_port); + + +/** + * Compute the CADET port given a service descriptor + * (returned from #GNUNET_TUN_service_name_to_hash) and + * a TCP/UDP port @a ip_port. + * + * @param desc service shared secret + * @param ip_port TCP/UDP port, use 0 for ICMP + * @param[out] cadet_port CADET port to use + */ +void +GNUNET_TUN_compute_service_cadet_port (const struct GNUNET_HashCode *desc, + uint16_t ip_port, + struct GNUNET_HashCode *cadet_port); + #endif + +/** @} */ /* end of group */