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selftests/bpf: Test for get_socket_cookie

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Add test to use get_socket_cookie() from BPF programs of types
BPF_PROG_TYPE_SOCK_OPS and BPF_PROG_TYPE_CGROUP_SOCK_ADDR.

The test attaches two programs to cgroup, runs TCP server and client in
the cgroup and checks that two operations are done properly on client
socket when user calls connect(2):

1. In BPF_CGROUP_INET6_CONNECT socket cookie is used as the key to write
   new value in a map for client socket.

2. In BPF_CGROUP_SOCK_OPS (BPF_SOCK_OPS_TCP_CONNECT_CB callback) the
   value written in "1." is found by socket cookie, since it's the same
   socket, and updated.

Finally the test verifies the value in the map.

Signed-off-by: Andrey Ignatov <rdna@fb.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Andrey Ignatov 2018-07-30 17:42:31 -07:00 committed by Daniel Borkmann
parent 0289a2cca0
commit 194db0d958
3 changed files with 289 additions and 2 deletions
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6
tools/testing/selftests/bpf/Makefile
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@ -22,7 +22,8 @@ $(TEST_CUSTOM_PROGS): $(OUTPUT)/%: %.c
# Order correspond to 'make run_tests' order
TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test_progs \
test_align test_verifier_log test_dev_cgroup test_tcpbpf_user \
test_sock test_btf test_sockmap test_lirc_mode2_user get_cgroup_id_user
test_sock test_btf test_sockmap test_lirc_mode2_user get_cgroup_id_user \
test_socket_cookie
TEST_GEN_FILES = test_pkt_access.o test_xdp.o test_l4lb.o test_tcp_estats.o test_obj_id.o \
test_pkt_md_access.o test_xdp_redirect.o test_xdp_meta.o sockmap_parse_prog.o \
@ -33,7 +34,7 @@ TEST_GEN_FILES = test_pkt_access.o test_xdp.o test_l4lb.o test_tcp_estats.o test
test_btf_haskv.o test_btf_nokv.o test_sockmap_kern.o test_tunnel_kern.o \
test_get_stack_rawtp.o test_sockmap_kern.o test_sockhash_kern.o \
test_lwt_seg6local.o sendmsg4_prog.o sendmsg6_prog.o test_lirc_mode2_kern.o \
get_cgroup_id_kern.o
get_cgroup_id_kern.o socket_cookie_prog.o
# Order correspond to 'make run_tests' order
TEST_PROGS := test_kmod.sh \
@ -60,6 +61,7 @@ $(TEST_GEN_PROGS_EXTENDED): $(OUTPUT)/libbpf.a
$(OUTPUT)/test_dev_cgroup: cgroup_helpers.c
$(OUTPUT)/test_sock: cgroup_helpers.c
$(OUTPUT)/test_sock_addr: cgroup_helpers.c
$(OUTPUT)/test_socket_cookie: cgroup_helpers.c
$(OUTPUT)/test_sockmap: cgroup_helpers.c
$(OUTPUT)/test_tcpbpf_user: cgroup_helpers.c
$(OUTPUT)/test_progs: trace_helpers.c

60
tools/testing/selftests/bpf/socket_cookie_prog.c Normal file
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@ -0,0 +1,60 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2018 Facebook
#include <linux/bpf.h>
#include <sys/socket.h>
#include "bpf_helpers.h"
#include "bpf_endian.h"
struct bpf_map_def SEC("maps") socket_cookies = {
.type = BPF_MAP_TYPE_HASH,
.key_size = sizeof(__u64),
.value_size = sizeof(__u32),
.max_entries = 1 << 8,
};
SEC("cgroup/connect6")
int set_cookie(struct bpf_sock_addr *ctx)
{
__u32 cookie_value = 0xFF;
__u64 cookie_key;
if (ctx->family != AF_INET6 || ctx->user_family != AF_INET6)
return 1;
cookie_key = bpf_get_socket_cookie(ctx);
if (bpf_map_update_elem(&socket_cookies, &cookie_key, &cookie_value, 0))
return 0;
return 1;
}
SEC("sockops")
int update_cookie(struct bpf_sock_ops *ctx)
{
__u32 new_cookie_value;
__u32 *cookie_value;
__u64 cookie_key;
if (ctx->family != AF_INET6)
return 1;
if (ctx->op != BPF_SOCK_OPS_TCP_CONNECT_CB)
return 1;
cookie_key = bpf_get_socket_cookie(ctx);
cookie_value = bpf_map_lookup_elem(&socket_cookies, &cookie_key);
if (!cookie_value)
return 1;
new_cookie_value = (ctx->local_port << 8) | *cookie_value;
bpf_map_update_elem(&socket_cookies, &cookie_key, &new_cookie_value, 0);
return 1;
}
int _version SEC("version") = 1;
char _license[] SEC("license") = "GPL";

225
tools/testing/selftests/bpf/test_socket_cookie.c Normal file
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@ -0,0 +1,225 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2018 Facebook
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#include "bpf_rlimit.h"
#include "cgroup_helpers.h"
#define CG_PATH "/foo"
#define SOCKET_COOKIE_PROG "./socket_cookie_prog.o"
static int start_server(void)
{
struct sockaddr_in6 addr;
int fd;
fd = socket(AF_INET6, SOCK_STREAM, 0);
if (fd == -1) {
log_err("Failed to create server socket");
goto out;
}
memset(&addr, 0, sizeof(addr));
addr.sin6_family = AF_INET6;
addr.sin6_addr = in6addr_loopback;
addr.sin6_port = 0;
if (bind(fd, (const struct sockaddr *)&addr, sizeof(addr)) == -1) {
log_err("Failed to bind server socket");
goto close_out;
}
if (listen(fd, 128) == -1) {
log_err("Failed to listen on server socket");
goto close_out;
}
goto out;
close_out:
close(fd);
fd = -1;
out:
return fd;
}
static int connect_to_server(int server_fd)
{
struct sockaddr_storage addr;
socklen_t len = sizeof(addr);
int fd;
fd = socket(AF_INET6, SOCK_STREAM, 0);
if (fd == -1) {
log_err("Failed to create client socket");
goto out;
}
if (getsockname(server_fd, (struct sockaddr *)&addr, &len)) {
log_err("Failed to get server addr");
goto close_out;
}
if (connect(fd, (const struct sockaddr *)&addr, len) == -1) {
log_err("Fail to connect to server");
goto close_out;
}
goto out;
close_out:
close(fd);
fd = -1;
out:
return fd;
}
static int validate_map(struct bpf_map *map, int client_fd)
{
__u32 cookie_expected_value;
struct sockaddr_in6 addr;
socklen_t len = sizeof(addr);
__u32 cookie_value;
__u64 cookie_key;
int err = 0;
int map_fd;
if (!map) {
log_err("Map not found in BPF object");
goto err;
}
map_fd = bpf_map__fd(map);
err = bpf_map_get_next_key(map_fd, NULL, &cookie_key);
if (err) {
log_err("Can't get cookie key from map");
goto out;
}
err = bpf_map_lookup_elem(map_fd, &cookie_key, &cookie_value);
if (err) {
log_err("Can't get cookie value from map");
goto out;
}
err = getsockname(client_fd, (struct sockaddr *)&addr, &len);
if (err) {
log_err("Can't get client local addr");
goto out;
}
cookie_expected_value = (ntohs(addr.sin6_port) << 8) | 0xFF;
if (cookie_value != cookie_expected_value) {
log_err("Unexpected value in map: %x != %x", cookie_value,
cookie_expected_value);
goto err;
}
goto out;
err:
err = -1;
out:
return err;
}
static int run_test(int cgfd)
{
enum bpf_attach_type attach_type;
struct bpf_prog_load_attr attr;
struct bpf_program *prog;
struct bpf_object *pobj;
const char *prog_name;
int server_fd = -1;
int client_fd = -1;
int prog_fd = -1;
int err = 0;
memset(&attr, 0, sizeof(attr));
attr.file = SOCKET_COOKIE_PROG;
attr.prog_type = BPF_PROG_TYPE_UNSPEC;
err = bpf_prog_load_xattr(&attr, &pobj, &prog_fd);
if (err) {
log_err("Failed to load %s", attr.file);
goto out;
}
bpf_object__for_each_program(prog, pobj) {
prog_name = bpf_program__title(prog, /*needs_copy*/ false);
if (strcmp(prog_name, "cgroup/connect6") == 0) {
attach_type = BPF_CGROUP_INET6_CONNECT;
} else if (strcmp(prog_name, "sockops") == 0) {
attach_type = BPF_CGROUP_SOCK_OPS;
} else {
log_err("Unexpected prog: %s", prog_name);
goto err;
}
err = bpf_prog_attach(bpf_program__fd(prog), cgfd, attach_type,
BPF_F_ALLOW_OVERRIDE);
if (err) {
log_err("Failed to attach prog %s", prog_name);
goto out;
}
}
server_fd = start_server();
if (server_fd == -1)
goto err;
client_fd = connect_to_server(server_fd);
if (client_fd == -1)
goto err;
if (validate_map(bpf_map__next(NULL, pobj), client_fd))
goto err;
goto out;
err:
err = -1;
out:
close(client_fd);
close(server_fd);
bpf_object__close(pobj);
printf("%s\n", err ? "FAILED" : "PASSED");
return err;
}
int main(int argc, char **argv)
{
int cgfd = -1;
int err = 0;
if (setup_cgroup_environment())
goto err;
cgfd = create_and_get_cgroup(CG_PATH);
if (!cgfd)
goto err;
if (join_cgroup(CG_PATH))
goto err;
if (run_test(cgfd))
goto err;
goto out;
err:
err = -1;
out:
close(cgfd);
cleanup_cgroup_environment();
return err;
}