Merge branch 'bpf-sendmsg-hook'
Andrey Ignatov says:
====================
v3 -> v4:
* handle static key correctly for CONFIG_CGROUP_BPF=n.
v2 -> v3:
* place BPF logic under static key in udp_sendmsg, udpv6_sendmsg;
* rebase.
v1 -> v2:
* return ENOTSUPP if bpf_prog rewrote IPv6-only with IPv4-mapped IPv6;
* add test for IPv4-mapped IPv6 use-case;
* fix build for CONFIG_CGROUP_BPF=n;
* rebase.
This path set adds BPF hooks for sys_sendmsg similar to existing hooks for
sys_bind and sys_connect.
Hooks allow to override source IP (including the case when it's set via
cmsg(3)) and destination IP:port for unconnected UDP (slow path). TCP and
connected UDP (fast path) are not affected. This makes UDP support
complete: connected UDP is handled by sys_connect hooks, unconnected by
sys_sendmsg ones.
Similar to sys_connect hooks, sys_sendmsg ones can be used to make system
calls such as sendmsg(2) and sendto(2) return EPERM.
Please see patch 0002 for more details.
====================
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
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