passt/siphash.h, branch 2023_03_21.1ee2f7c

treewide: Add include guards

2022-03-29T13:35:38+00:00

...at the moment, just for consistency with packet.h, icmp.h,
tcp.h and udp.h.

Signed-off-by: Stefano Brivio

LICENSES: Add license text files, add missing notices, fix SPDX tags

2021-10-20T06:29:30+00:00

SPDX tags don't replace license files. Some notices were missing and
some tags were not according to the SPDX specification, too.

Now reuse --lint from the REUSE tool (https://reuse.software/) passes.

Reported-by: Martin Hauke 
Signed-off-by: Stefano Brivio

tcp: Add siphash implementation for initial sequence numbers

2021-03-17T09:57:36+00:00

Implement siphash routines for initial TCP sequence numbers (12 bytes
input for IPv4, 36 bytes input for IPv6), and while at it, also
functions we'll use later on for hash table indices and TCP timestamp
offsets (with 8, 20, 32 bytes of input).

Use these to set the initial sequence number, according to RFC 6528,
for connections originating either from the tap device or from
sockets.

Signed-off-by: Stefano Brivio