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selftests/bpf: Add test to verify the fix for bpf_setsockopt() helper

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Verify the fix by:

1. Attach cgroup sockops prog.
2. Build a tcp connection using ipv4 addr in ipv6 socket.
3. Verify the return value of bpf_setsockopt() helper.

Assisted-by: Codex:gpt-5.5-xhigh
Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Link: https://lore.kernel.org/r/20260613162443.60515-3-leon.hwang@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Leon Hwang 2026-06-14 00:24:43 +08:00 committed by Alexei Starovoitov
parent ca0f587c02
commit 5cf2c21ab0
2 changed files with 101 additions and 0 deletions
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78
tools/testing/selftests/bpf/prog_tests/setget_sockopt.c
View File

@ -199,6 +199,83 @@ static void test_nonstandard_opt(int family)
bpf_link__destroy(getsockopt_link);
}
static int connect_to_v4mapped_v6_fd(int server_fd)
{
struct sockaddr_storage addr;
struct sockaddr_in *addr4 = (void *)&addr;
socklen_t addrlen = sizeof(addr);
struct sockaddr_in6 addr6 = {};
int fd = -1, v6only = 0, err;
err = getsockname(server_fd, (struct sockaddr *)&addr, &addrlen);
if (!ASSERT_OK(err, "getsockname"))
return -1;
fd = socket(AF_INET6, SOCK_STREAM, 0);
if (!ASSERT_GE(fd, 0, "socket"))
return -1;
err = settimeo(fd, 0);
if (!ASSERT_OK(err, "settimeo"))
goto err_out;
err = setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &v6only, sizeof(v6only));
if (!ASSERT_OK(err, "clear_v6only"))
goto err_out;
addr6.sin6_family = AF_INET6;
addr6.sin6_port = addr4->sin_port;
addr6.sin6_addr.s6_addr[10] = 0xff;
addr6.sin6_addr.s6_addr[11] = 0xff;
memcpy(&addr6.sin6_addr.s6_addr[12], &addr4->sin_addr, sizeof(addr4->sin_addr));
err = connect(fd, (struct sockaddr *)&addr6, sizeof(addr6));
if (!ASSERT_OK(err, "connect"))
goto err_out;
return fd;
err_out:
close(fd);
return -1;
}
static void test_v4mapped_v6_ip_tos(void)
{
struct setget_sockopt__bss *bss = skel->bss;
int sfd = -1, fd = -1, got = 0, exp = 0x1c;
socklen_t optlen;
memset(bss, 0, sizeof(*bss));
bss->v4mapped_v6_ip_tos_enable = 1;
bss->v4mapped_v6_ip_tos_ret = -1;
bss->v4mapped_v6_ip_tos_val = exp;
sfd = start_server(AF_INET, SOCK_STREAM, addr4_str, 0, 0);
if (!ASSERT_GE(sfd, 0, "start_server"))
goto err_out;
fd = connect_to_v4mapped_v6_fd(sfd);
if (!ASSERT_GE(fd, 0, "connect_to_v4mapped_v6_fd"))
goto err_out;
ASSERT_GT(bss->v4mapped_v6_ip_tos_cnt, 0, "v4mapped_v6_ip_tos_cnt");
ASSERT_EQ(bss->v4mapped_v6_ip_tos_ret, 0, "v4mapped_v6_ip_tos_ret");
optlen = sizeof(got);
if (!ASSERT_OK(getsockopt(fd, SOL_IP, IP_TOS, &got, &optlen), "getsockopt_ip_tos"))
goto err_out;
ASSERT_EQ(got, exp, "ip_tos");
err_out:
bss->v4mapped_v6_ip_tos_enable = 0;
if (fd >= 0)
close(fd);
if (sfd >= 0)
close(sfd);
}
void test_setget_sockopt(void)
{
cg_fd = test__join_cgroup(CG_NAME);
@ -238,6 +315,7 @@ void test_setget_sockopt(void)
test_ktls(AF_INET);
test_nonstandard_opt(AF_INET);
test_nonstandard_opt(AF_INET6);
test_v4mapped_v6_ip_tos();
done:
setget_sockopt__destroy(skel);

23
tools/testing/selftests/bpf/progs/setget_sockopt.c
View File

@ -387,6 +387,24 @@ int _getsockopt(struct bpf_sockopt *ctx)
return 1;
}
int v4mapped_v6_ip_tos_enable;
int v4mapped_v6_ip_tos_ret;
int v4mapped_v6_ip_tos_cnt;
int v4mapped_v6_ip_tos_val;
static void test_v4mapped_v6_ip_tos(struct bpf_sock_ops *skops)
{
int tos = v4mapped_v6_ip_tos_val;
if (!v4mapped_v6_ip_tos_enable || skops->op != BPF_SOCK_OPS_TCP_CONNECT_CB)
return;
if (skops->family != AF_INET6)
return;
v4mapped_v6_ip_tos_cnt++;
v4mapped_v6_ip_tos_ret = bpf_setsockopt(skops, IPPROTO_IP, IP_TOS, &tos, sizeof(tos));
}
SEC("sockops")
int skops_sockopt(struct bpf_sock_ops *skops)
{
@ -401,6 +419,11 @@ int skops_sockopt(struct bpf_sock_ops *skops)
if (!sk)
return 1;
if (v4mapped_v6_ip_tos_enable) {
test_v4mapped_v6_ip_tos(skops);
return 1;
}
switch (skops->op) {
case BPF_SOCK_OPS_TCP_LISTEN_CB:
nr_listen += !(bpf_test_sockopt(skops, sk) ||