// SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2020 Isovalent, Inc. #include "vmlinux.h" #include <bpf/bpf_helpers.h> struct { __uint(type, BPF_MAP_TYPE_SOCKMAP); __uint(max_entries, 2); __type(key, __u32); __type(value, __u64); } sock_map SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_SOCKHASH); __uint(max_entries, 2); __type(key, __u32); __type(value, __u64); } sock_hash SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_SK_STORAGE); __uint(map_flags, BPF_F_NO_PREALLOC); __type(key, __u32); __type(value, __u64); } socket_storage SEC(".maps"); SEC("sk_msg") int prog_msg_verdict(struct sk_msg_md *msg) { struct task_struct *task = (struct task_struct *)bpf_get_current_task(); int verdict = SK_PASS; __u32 pid, tpid; __u64 *sk_stg; pid = bpf_get_current_pid_tgid() >> 32; sk_stg = bpf_sk_storage_get(&socket_storage, msg->sk, 0, BPF_SK_STORAGE_GET_F_CREATE); if (!sk_stg) return SK_DROP; *sk_stg = pid; bpf_probe_read_kernel(&tpid , sizeof(tpid), &task->tgid); if (pid != tpid) verdict = SK_DROP; bpf_sk_storage_delete(&socket_storage, (void *)msg->sk); return verdict; } char _license[] SEC("license") = "GPL";