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selftests/bpf: Add a selftest for the tracing bpf_get_socket_cookie

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This builds up on the existing socket cookie test which checks whether
the bpf_get_socket_cookie helpers provide the same value in
cgroup/connect6 and sockops programs for a socket created by the
userspace part of the test.

Instead of having an update_cookie sockops program tag a socket local
storage with 0xFF, this uses both an update_cookie_sockops program and
an update_cookie_tracing program which succesively tag the socket with
0x0F and then 0xF0.

Signed-off-by: Florent Revest <revest@chromium.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: KP Singh <kpsingh@kernel.org>
Link: https://lore.kernel.org/bpf/20210210111406.785541-5-revest@chromium.org
This commit is contained in:
Florent Revest 2021-02-10 12:14:06 +01:00 committed by Alexei Starovoitov
parent 6cd4dcc3fb
commit 6fdd671baa
2 changed files with 41 additions and 6 deletions
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11
tools/testing/selftests/bpf/prog_tests/socket_cookie.c
View File

@ -35,9 +35,14 @@ void test_socket_cookie(void)
if (!ASSERT_OK_PTR(skel->links.set_cookie, "prog_attach"))
goto close_cgroup_fd;
skel->links.update_cookie = bpf_program__attach_cgroup(
skel->progs.update_cookie, cgroup_fd);
if (!ASSERT_OK_PTR(skel->links.update_cookie, "prog_attach"))
skel->links.update_cookie_sockops = bpf_program__attach_cgroup(
skel->progs.update_cookie_sockops, cgroup_fd);
if (!ASSERT_OK_PTR(skel->links.update_cookie_sockops, "prog_attach"))
goto close_cgroup_fd;
skel->links.update_cookie_tracing = bpf_program__attach(
skel->progs.update_cookie_tracing);
if (!ASSERT_OK_PTR(skel->links.update_cookie_tracing, "prog_attach"))
goto close_cgroup_fd;
server_fd = start_server(AF_INET6, SOCK_STREAM, "::1", 0, 0);

36
tools/testing/selftests/bpf/progs/socket_cookie_prog.c
View File

@ -5,6 +5,7 @@
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_endian.h>
#include <bpf/bpf_tracing.h>
#define AF_INET6 10
@ -20,6 +21,14 @@ struct {
__type(value, struct socket_cookie);
} socket_cookies SEC(".maps");
/*
* These three programs get executed in a row on connect() syscalls. The
* userspace side of the test creates a client socket, issues a connect() on it
* and then checks that the local storage associated with this socket has:
* cookie_value == local_port << 8 | 0xFF
* The different parts of this cookie_value are appended by those hooks if they
* all agree on the output of bpf_get_socket_cookie().
*/
SEC("cgroup/connect6")
int set_cookie(struct bpf_sock_addr *ctx)
{
@ -33,14 +42,14 @@ int set_cookie(struct bpf_sock_addr *ctx)
if (!p)
return 1;
p->cookie_value = 0xFF;
p->cookie_value = 0xF;
p->cookie_key = bpf_get_socket_cookie(ctx);
return 1;
}
SEC("sockops")
int update_cookie(struct bpf_sock_ops *ctx)
int update_cookie_sockops(struct bpf_sock_ops *ctx)
{
struct bpf_sock *sk = ctx->sk;
struct socket_cookie *p;
@ -61,9 +70,30 @@ int update_cookie(struct bpf_sock_ops *ctx)
if (p->cookie_key != bpf_get_socket_cookie(ctx))
return 1;
p->cookie_value = (ctx->local_port << 8) | p->cookie_value;
p->cookie_value |= (ctx->local_port << 8);
return 1;
}
SEC("fexit/inet_stream_connect")
int BPF_PROG(update_cookie_tracing, struct socket *sock,
struct sockaddr *uaddr, int addr_len, int flags)
{
struct socket_cookie *p;
if (uaddr->sa_family != AF_INET6)
return 0;
p = bpf_sk_storage_get(&socket_cookies, sock->sk, 0, 0);
if (!p)
return 0;
if (p->cookie_key != bpf_get_socket_cookie(sock->sk))
return 0;
p->cookie_value |= 0xF0;
return 0;
}
char _license[] SEC("license") = "GPL";