BPF_PROG_TYPE_SOCK_OPS is a BPF program type which is called when a set of actions is performed on a TCP socket.
Right now, I am using it to mark TCP sockets that are trying to connect with an fwmark.
I want to do the same for UDP sockets, but unfortunately the BPF_PROG_TYPE_SOCK_OPS probe is not called on UDP packets.
Is there an equivalent?
UDP sockets don't really connect, so similar event to trigger on. Closest thing would be to trigger on socket creation with the use of a BPF_PROG_TYPE_CGROUP_SOCK program.
You can also find a list of all BPF sockets here. Since you want to set a socket option, you can also look at the man page of the bpf helpers. For bpf_setsockopt, you will find a list of attach points for which this helper will be available. Note though that for some BPF probes, you can also edit the socket mark directly (e.g. BPF_CGROUP_INET_SOCK_CREATE) without calling the helper function.