// SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2020 Cloudflare */ #include "bpf_iter.h" #include "bpf_tracing_net.h" #include <bpf/bpf_helpers.h> #include <bpf/bpf_tracing.h> #include <errno.h> char _license[] SEC("license") = "GPL"; struct { __uint(type, BPF_MAP_TYPE_SOCKMAP); __uint(max_entries, 64); __type(key, __u32); __type(value, __u64); } sockmap SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_SOCKHASH); __uint(max_entries, 64); __type(key, __u32); __type(value, __u64); } sockhash SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_SOCKHASH); __uint(max_entries, 64); __type(key, __u32); __type(value, __u64); } dst SEC(".maps"); __u32 elems = 0; __u32 socks = 0; SEC("iter/sockmap") int copy(struct bpf_iter__sockmap *ctx) { struct sock *sk = ctx->sk; __u32 tmp, *key = ctx->key; int ret; if (!key) return 0; elems++; /* We need a temporary buffer on the stack, since the verifier doesn't * let us use the pointer from the context as an argument to the helper. */ tmp = *key; if (sk) { socks++; return bpf_map_update_elem(&dst, &tmp, sk, 0) != 0; } ret = bpf_map_delete_elem(&dst, &tmp); return ret && ret != -ENOENT; }