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2ef6804ead
This change adds all the kernel parts of a network stack. The network stack is partial but implements many of the important parts. Add if(4) network interface abstraction. Network interfaces are registered in a global list that can be iterated and each assigned an unique integer identifier. Add reference counted packets with a cache that recycles recent packets. Add support for lo(4) loopback and ether(4) ethernet network interfaces. The /dev/lo0 loopback device is created automatically on boot. Add arp(4) address resolution protocol driver for translation of inet(4) network layer addresses into ether(4) link layer addresses. arp(4) entries are cached and evicted from the cache when needed or when the entry has not been used for a while. The cache is limited to 256 entries for now. Add ip(4) internet protocol version 4 support. IP fragmentation and options are not implemented yet. Add tcp(4) transmission control protocol sockets for a reliable transport layer protocol that provides a reliable byte stream connection between two hosts. The implementation is incomplete and does not yet implement out of band data, options, and high performance extensions. Add udp(4) user datagram protocol sockets for a connectionless transport layer that provides best-effort delivery of datagrams. Add ping(4) sockets for a best-effort delivery of echo datagrams. Change type of sa_family_t from unsigned short to uint16_t. Add --disable-network-drivers to the kernel(7) options and expose it with a bootloader menu. tix-iso-bootconfig can set this option by default. Import CRC32 code from libz for the Ethernet checksum. This is a compatible ABI change that adds features to socket(2) (AF_INET, IPPROTO_TCP, IPPROTO_UDP, IPPROTO_PING), the ioctls for if(4), socket options, and the lo0 loopback interface. This commit is based on work by Meisaka Yukara contributed as the commit bbf7f1e8a5238a2bd1fe8eb1d2cc5c9c2421e2c4. Almost no lines of this work remains in this final commit as it has been rewritten or refactored away over the years, see the individual file headers for which files contain remnants of this work. Co-authored-by: Meisaka Yukara <Meisaka.Yukara@gmail.com>
95 lines
2.9 KiB
C
95 lines
2.9 KiB
C
/*
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* Copyright (c) 2014, 2018 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* netinet/tcp.h
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* Transmission Control Protocol.
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*/
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#ifndef _INCLUDE_NETINET_TCP_H
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#define _INCLUDE_NETINET_TCP_H
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#include <sys/cdefs.h>
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#if __USE_SORTIX
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#include <netinet/in.h>
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#endif
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#if __USE_SORTIX
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typedef uint32_t tcp_seq; /* TCP sequence number. */
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/* Control Bits in struct tcphdr th_flags. */
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#define TH_FIN (1 << 0) /* No more data from sender. */
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#define TH_SYN (1 << 1) /* Synchronize sequence numbers. */
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#define TH_RST (1 << 2) /* Reset the connection. */
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#define TH_PUSH (1 << 3) /* Push Function. */
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#define TH_ACK (1 << 4) /* Acknowledgment field significant. */
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#define TH_URG (1 << 5) /* Urgent Pointer field significant. */
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struct tcphdr
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{
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in_port_t th_sport; /* Source Port. */
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in_port_t th_dport; /* Destination Port. */
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tcp_seq th_seq; /* Sequence Number. */
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tcp_seq th_ack; /* Acknowledgment Number. */
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__extension__ union
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{
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__extension__ struct
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{
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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uint8_t th_x2:4; /* Reserved. */
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uint8_t th_off:4; /* Data offset. */
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#elif __BYTE_ORDER == __BIG_ENDIAN
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uint8_t th_off:4; /* Data offset. */
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uint8_t th_x2:4; /* Reserved. */
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#else
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#warning "You need to add support for your endian"
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#endif
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};
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uint8_t th_offset;
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};
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uint8_t th_flags; /* Control Bits. */
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uint16_t th_win; /* Window. */
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uint16_t th_sum; /* Checksum. */
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uint16_t th_urp; /* Urgent Pointer. */
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};
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#define TCP_OFFSET_ENCODE(x) (((x) & 0xF) << 4) /* Encode th_offset. */
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#define TCP_OFFSET_DECODE(x) (((x) >> 4) & 0xF) /* Decode th_offset. */
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#define TCP_MSS 536 /* Default Maximum Segment Size. */
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#define TCPOPT_EOL 0 /* End of Option List. */
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#define TCPOPT_NOP 1 /* No-Operation. */
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#define TCPOPT_MAXSEG 2 /* Maximum Segment Size. */
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#define TCPOLEN_MAXSEG 4 /* Length of Maximum Segment Size. */
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/* Maximum header size: 16 * 4 bytes */
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#define TCP_MAXHLEN 64
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/* Maximum total length of options. */
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#define TCP_MAXOLEN (TCP_MAXHLEN - sizeof(struct tcphdr))
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#define TCP_MAXWIN 65535 /* Maximum window size. */
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#endif
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/* Options at the IPPROTO_TCP socket level. */
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#define TCP_NODELAY 1
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#if __USE_SORTIX
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#define TCP_MAXSEG 2
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#define TCP_NOPUSH 3
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#endif
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#endif
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