cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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bpf_iter_sockmap.c (1182B)


      1// SPDX-License-Identifier: GPL-2.0
      2/* Copyright (c) 2020 Cloudflare */
      3#include "bpf_iter.h"
      4#include "bpf_tracing_net.h"
      5#include <bpf/bpf_helpers.h>
      6#include <bpf/bpf_tracing.h>
      7#include <errno.h>
      8
      9char _license[] SEC("license") = "GPL";
     10
     11struct {
     12	__uint(type, BPF_MAP_TYPE_SOCKMAP);
     13	__uint(max_entries, 64);
     14	__type(key, __u32);
     15	__type(value, __u64);
     16} sockmap SEC(".maps");
     17
     18struct {
     19	__uint(type, BPF_MAP_TYPE_SOCKHASH);
     20	__uint(max_entries, 64);
     21	__type(key, __u32);
     22	__type(value, __u64);
     23} sockhash SEC(".maps");
     24
     25struct {
     26	__uint(type, BPF_MAP_TYPE_SOCKHASH);
     27	__uint(max_entries, 64);
     28	__type(key, __u32);
     29	__type(value, __u64);
     30} dst SEC(".maps");
     31
     32__u32 elems = 0;
     33__u32 socks = 0;
     34
     35SEC("iter/sockmap")
     36int copy(struct bpf_iter__sockmap *ctx)
     37{
     38	struct sock *sk = ctx->sk;
     39	__u32 tmp, *key = ctx->key;
     40	int ret;
     41
     42	if (!key)
     43		return 0;
     44
     45	elems++;
     46
     47	/* We need a temporary buffer on the stack, since the verifier doesn't
     48	 * let us use the pointer from the context as an argument to the helper.
     49	 */
     50	tmp = *key;
     51
     52	if (sk) {
     53		socks++;
     54		return bpf_map_update_elem(&dst, &tmp, sk, 0) != 0;
     55	}
     56
     57	ret = bpf_map_delete_elem(&dst, &tmp);
     58	return ret && ret != -ENOENT;
     59}