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selftests: bpf: Test sockmap update from BPF

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Add a test which copies a socket from a sockmap into another sockmap
or sockhash. This excercises bpf_map_update_elem support from BPF
context. Compare the socket cookies from source and destination to
ensure that the copy succeeded.

Also check that the verifier rejects map_update from unsafe contexts.

Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20200821102948.21918-7-lmb@cloudflare.com
This commit is contained in:
Lorenz Bauer
2020-08-21 11:29:48 +01:00
committed by Alexei Starovoitov
parent 0126240f44
commit bb23c0e1c5
3 changed files with 149 additions and 0 deletions
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48
tools/testing/selftests/bpf/progs/test_sockmap_update.c Normal file
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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2020 Cloudflare
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
struct {
__uint(type, BPF_MAP_TYPE_SOCKMAP);
__uint(max_entries, 1);
__type(key, __u32);
__type(value, __u64);
} src SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_SOCKMAP);
__uint(max_entries, 1);
__type(key, __u32);
__type(value, __u64);
} dst_sock_map SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_SOCKHASH);
__uint(max_entries, 1);
__type(key, __u32);
__type(value, __u64);
} dst_sock_hash SEC(".maps");
SEC("classifier/copy_sock_map")
int copy_sock_map(void *ctx)
{
struct bpf_sock *sk;
bool failed = false;
__u32 key = 0;
sk = bpf_map_lookup_elem(&src, &key);
if (!sk)
return SK_DROP;
if (bpf_map_update_elem(&dst_sock_map, &key, sk, 0))
failed = true;
if (bpf_map_update_elem(&dst_sock_hash, &key, sk, 0))
failed = true;
bpf_sk_release(sk);
return failed ? SK_DROP : SK_PASS;
}
char _license[] SEC("license") = "GPL";