# Copyright 2018 syzkaller project authors. All rights reserved.
# Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.

# TODO(blackgnezdo): discover a cheap way to share protocol
# descriptions between different OSs. They are platform agnostic
# and should not need to be recreated on each platform.

syz_emit_ethernet(len len[packet], packet ptr[in, array[int8]])

resource tcp_seq_num[int32]: 0x41424344

tcp_resources {
	seq	tcp_seq_num
	ack	tcp_seq_num
}

# These pseudo syscalls read a packet from tap device and extract tcp sequence and acknowledgement numbers from it.
# They also adds the inc arguments to the returned values, this way sequence numbers get incremented.
syz_extract_tcp_res(res ptr[out, tcp_resources], seq_inc int32, ack_inc int32)
syz_extract_tcp_res$synack(res ptr[out, tcp_resources], seq_inc const[1], ack_inc const[0])