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* Add csum_ip4_header() helper to calculate IPv4 header checksumsDavid Gibson2022-10-191-0/+1
| | | | | | | | We calculate IPv4 header checksums in at least two places, in dhcp() and in tap_ip_send. Add a helper to handle this calculation in both places. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* Add csum_udp4() helper for calculating UDP over IPv4 checksumsDavid Gibson2022-10-191-0/+2
| | | | | | | | | | | | | At least two places in passt fill in UDP over IPv4 checksums, although since UDP checksums are optional with IPv4 that just amounts to storing a 0 (in tap_ip_send()) or leaving a 0 from an earlier initialization (in dhcp()). For consistency, add a helper for this "calculation". Just for the heck of it, add the option (compile time disabled for now) to calculate real UDP checksums. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* Add csum_udp6() helper for calculating UDP over IPv6 checksumsDavid Gibson2022-10-191-0/+4
| | | | | | | | | | | Add a helper for calculating UDP checksums when used over IPv6 For future flexibility, the new helper takes parameters for the fields in the IPv6 pseudo-header, so an IPv6 header or pseudo-header doesn't need to be explicitly constructed. It also allows the UDP header and payload to be in separate buffers, although we don't use this yet. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* Add csum_icmp4() helper for calculating ICMP checksumsDavid Gibson2022-10-191-0/+2
| | | | | | | | | | Although tap_ip_send() is currently the only place calculating ICMP checksums, create a helper function for symmetry with ICMPv6. For future flexibility it allows the ICMPv6 header and payload to be in separate buffers. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* Add csum_icmp6() helper for calculating ICMPv6 checksumsDavid Gibson2022-10-191-0/+5
| | | | | | | | | | | | At least two places in passt calculate ICMPv6 checksums, ndp() and tap_ip_send(). Add a helper to handle this calculation in both places. For future flexibility, the new helper takes parameters for the fields in the IPv6 pseudo-header, so an IPv6 header or pseudo-header doesn't need to be explicitly constructed. It also allows the ICMPv6 header and payload to be in separate buffers, although we don't use this yet. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* treewide: Mark constant references as constStefano Brivio2022-03-291-2/+2
| | | | Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* treewide: Add include guardsStefano Brivio2022-03-291-0/+5
| | | | | | | ...at the moment, just for consistency with packet.h, icmp.h, tcp.h and udp.h. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* LICENSES: Add license text files, add missing notices, fix SPDX tagsStefano Brivio2021-10-201-0/+5
| | | | | | | | | | 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 <mardnh@gmx.de> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* checksum: Add checksum.hStefano Brivio2021-09-141-0/+5
I forgot to commit this. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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