mirror of
https://code.semirocket.science/wrapsix
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4dbbcf7fc1
More sanity checks Fixed expiration of TTL in IPv4 packets Optimisations Fixed subtle mistakes
52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
/*
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* WrapSix
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* Copyright (C) 2008-2017 xHire <xhire@wrapsix.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef TCP_H
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#define TCP_H
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#define TCP_FLAG_FIN 0x01
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#define TCP_FLAG_SYN 0x02
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#define TCP_FLAG_RST 0x04
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#define TCP_STATE_INIT 1
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#define TCP_STATE_EST 2
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#define TCP_STATE_FIN4 3
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#define TCP_STATE_FIN6 4
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#define TCP_STATE_FIN64 5
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#define TCP_STATE_TRANS 6
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/* TCP header structure */
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struct s_tcp {
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unsigned short port_src; /* 16 b; source port */
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unsigned short port_dest; /* 16 b; destination port */
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unsigned int seq; /* 32 b; sequence number */
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unsigned int ack; /* 32 b; acknowledgement number */
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unsigned char offset; /* 4 b; data offset
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6 b; reserved (zeros) */
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unsigned char flags; /* 6 b; flags */
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unsigned short window; /* 16 b; size of the receive window */
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unsigned short checksum; /* 16 b */
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} __attribute__ ((__packed__));
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int tcp_ipv4(struct s_ethernet *eth4, struct s_ipv4 *ip4, char *payload,
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unsigned short payload_size);
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int tcp_ipv6(struct s_ethernet *eth6, struct s_ipv6 *ip6, char *payload,
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unsigned short payload_size);
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#endif /* TCP_H */
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