// SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2023 Facebook */ #include "vmlinux.h" #include "bpf_tracing_net.h" #include <bpf/bpf_helpers.h> #include <bpf/bpf_tracing.h> #include <bpf/bpf_core_read.h> void *local_storage_ptr = NULL; void *sk_ptr = NULL; int cookie_found = 0; __u64 cookie = 0; __u32 omem = 0; void *bpf_rdonly_cast(void *, __u32) __ksym; struct { __uint(type, BPF_MAP_TYPE_SK_STORAGE); __uint(map_flags, BPF_F_NO_PREALLOC); __type(key, int); __type(value, int); } sk_storage SEC(".maps"); SEC("fexit/bpf_local_storage_destroy") int BPF_PROG(bpf_local_storage_destroy, struct bpf_local_storage *local_storage) { struct sock *sk; if (local_storage_ptr != local_storage) return 0; sk = bpf_rdonly_cast(sk_ptr, bpf_core_type_id_kernel(struct sock)); if (sk->sk_cookie.counter != cookie) return 0; cookie_found++; omem = sk->sk_omem_alloc.counter; local_storage_ptr = NULL; return 0; } SEC("fentry/inet6_sock_destruct") int BPF_PROG(inet6_sock_destruct, struct sock *sk) { int *value; if (!cookie || sk->sk_cookie.counter != cookie) return 0; value = bpf_sk_storage_get(&sk_storage, sk, 0, 0); if (value && *value == 0xdeadbeef) { cookie_found++; sk_ptr = sk; local_storage_ptr = sk->sk_bpf_storage; } return 0; } char _license[] SEC("license") = "GPL";