clat: use AF_PACKET/SOCK_RAW not SOCK_DGRAM sockets
This switches incoming packets from L3 to L2,
ie. they now include the ethernet header for non-rawip cases
(like wifi)
Note: depends on userspace clatd change to offset packet
processing index by tpacket_auxdata->tp_net L3 header offset,
an increase in the read buffer size, and on change to use
IPv6 header relative cBPF for ingress packet filtering!
Test: TreeHugger, atest libclat_test, ping 1.1.1.1 on v6-only wifi
Bug: 265591307
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Ie5893d18b0dd796751f95150680a0d4cd5f64c3c
2 files changed