bybrooklyn/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-04-18 14:53:58 -04:00
Code Issues Packages Projects Releases Wiki Activity

selftests: bpf: Test sockmap update from BPF

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

78
tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
View File

@@ -4,6 +4,8 @@
#include "test_progs.h"
#include "test_skmsg_load_helpers.skel.h"
#include "test_sockmap_update.skel.h"
#include "test_sockmap_invalid_update.skel.h"
#define TCP_REPAIR 19 /* TCP sock is under repair right now */
@@ -101,6 +103,76 @@ out:
test_skmsg_load_helpers__destroy(skel);
}
static void test_sockmap_update(enum bpf_map_type map_type)
{
struct bpf_prog_test_run_attr tattr;
int err, prog, src, dst, duration = 0;
struct test_sockmap_update *skel;
__u64 src_cookie, dst_cookie;
const __u32 zero = 0;
char dummy[14] = {0};
__s64 sk;
sk = connected_socket_v4();
if (CHECK(sk == -1, "connected_socket_v4", "cannot connect\n"))
return;
skel = test_sockmap_update__open_and_load();
if (CHECK(!skel, "open_and_load", "cannot load skeleton\n")) {
close(sk);
return;
}
prog = bpf_program__fd(skel->progs.copy_sock_map);
src = bpf_map__fd(skel->maps.src);
if (map_type == BPF_MAP_TYPE_SOCKMAP)
dst = bpf_map__fd(skel->maps.dst_sock_map);
else
dst = bpf_map__fd(skel->maps.dst_sock_hash);
err = bpf_map_update_elem(src, &zero, &sk, BPF_NOEXIST);
if (CHECK(err, "update_elem(src)", "errno=%u\n", errno))
goto out;
err = bpf_map_lookup_elem(src, &zero, &src_cookie);
if (CHECK(err, "lookup_elem(src, cookie)", "errno=%u\n", errno))
goto out;
tattr = (struct bpf_prog_test_run_attr){
.prog_fd = prog,
.repeat = 1,
.data_in = dummy,
.data_size_in = sizeof(dummy),
};
err = bpf_prog_test_run_xattr(&tattr);
if (CHECK_ATTR(err || !tattr.retval, "bpf_prog_test_run",
"errno=%u retval=%u\n", errno, tattr.retval))
goto out;
err = bpf_map_lookup_elem(dst, &zero, &dst_cookie);
if (CHECK(err, "lookup_elem(dst, cookie)", "errno=%u\n", errno))
goto out;
CHECK(dst_cookie != src_cookie, "cookie mismatch", "%llu != %llu\n",
dst_cookie, src_cookie);
out:
close(sk);
test_sockmap_update__destroy(skel);
}
static void test_sockmap_invalid_update(void)
{
struct test_sockmap_invalid_update *skel;
int duration = 0;
skel = test_sockmap_invalid_update__open_and_load();
CHECK(skel, "open_and_load", "verifier accepted map_update\n");
if (skel)
test_sockmap_invalid_update__destroy(skel);
}
void test_sockmap_basic(void)
{
if (test__start_subtest("sockmap create_update_free"))
@@ -111,4 +183,10 @@ void test_sockmap_basic(void)
test_skmsg_helpers(BPF_MAP_TYPE_SOCKMAP);
if (test__start_subtest("sockhash sk_msg load helpers"))
test_skmsg_helpers(BPF_MAP_TYPE_SOCKHASH);
if (test__start_subtest("sockmap update"))
test_sockmap_update(BPF_MAP_TYPE_SOCKMAP);
if (test__start_subtest("sockhash update"))
test_sockmap_update(BPF_MAP_TYPE_SOCKHASH);
if (test__start_subtest("sockmap update in unsafe context"))
test_sockmap_invalid_update();
}