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// Copyright (c) 2020 Cloudflare
#include <error.h>
#include <netinet/tcp.h>
#include "test_progs.h"
#include "test_skmsg_load_helpers.skel.h"
#include "test_sockmap_update.skel.h"
#include "test_sockmap_invalid_update.skel.h"
#include "test_sockmap_skb_verdict_attach.skel.h"
#include "bpf_iter_sockmap.skel.h"
#define TCP_REPAIR 19 /* TCP sock is under repair right now */
#define TCP_REPAIR_ON 1
#define TCP_REPAIR_OFF_NO_WP -1 /* Turn off without window probes */
static int connected_socket_v4(void)
{
struct sockaddr_in addr = {
.sin_family = AF_INET,
.sin_port = htons(80),
.sin_addr = { inet_addr("127.0.0.1") },
};
socklen_t len = sizeof(addr);
int s, repair, err;
s = socket(AF_INET, SOCK_STREAM, 0);
if (CHECK_FAIL(s == -1))
goto error;
repair = TCP_REPAIR_ON;
err = setsockopt(s, SOL_TCP, TCP_REPAIR, &repair, sizeof(repair));
if (CHECK_FAIL(err))
goto error;
err = connect(s, (struct sockaddr *)&addr, len);
if (CHECK_FAIL(err))
goto error;
repair = TCP_REPAIR_OFF_NO_WP;
err = setsockopt(s, SOL_TCP, TCP_REPAIR, &repair, sizeof(repair));
if (CHECK_FAIL(err))
goto error;
return s;
error:
perror(__func__);
close(s);
return -1;
}
static void compare_cookies(struct bpf_map *src, struct bpf_map *dst)
{
__u32 i, max_entries = bpf_map__max_entries(src);
int err, duration = 0, src_fd, dst_fd;
src_fd = bpf_map__fd(src);
dst_fd = bpf_map__fd(dst);
for (i = 0; i < max_entries; i++) {
__u64 src_cookie, dst_cookie;
err = bpf_map_lookup_elem(src_fd, &i, &src_cookie);
if (err && errno == ENOENT) {
err = bpf_map_lookup_elem(dst_fd, &i, &dst_cookie);
CHECK(!err, "map_lookup_elem(dst)", "element %u not deleted\n", i);
CHECK(err && errno != ENOENT, "map_lookup_elem(dst)", "%s\n",
strerror(errno));
continue;
}
if (CHECK(err, "lookup_elem(src)", "%s\n", strerror(errno)))
continue;
err = bpf_map_lookup_elem(dst_fd, &i, &dst_cookie);
if (CHECK(err, "lookup_elem(dst)", "%s\n", strerror(errno)))
continue;
CHECK(dst_cookie != src_cookie, "cookie mismatch",
"%llu != %llu (pos %u)\n", dst_cookie, src_cookie, i);
}
}
/* Create a map, populate it with one socket, and free the map. */
static void test_sockmap_create_update_free(enum bpf_map_type map_type)
{
const int zero = 0;
int s, map, err;
s = connected_socket_v4();
if (CHECK_FAIL(s < 0))
return;
map = bpf_create_map(map_type, sizeof(int), sizeof(int), 1, 0);
if (CHECK_FAIL(map < 0)) {
perror("bpf_create_map");
goto out;
}
err = bpf_map_update_elem(map, &zero, &s, BPF_NOEXIST);
if (CHECK_FAIL(err)) {
perror("bpf_map_update");
goto out;
}
out:
close(map);
close(s);
}
static void test_skmsg_helpers(enum bpf_map_type map_type)
{
struct test_skmsg_load_helpers *skel;
int err, map, verdict;
skel = test_skmsg_load_helpers__open_and_load();
if (CHECK_FAIL(!skel)) {
perror("test_skmsg_load_helpers__open_and_load");
return;
}
verdict = bpf_program__fd(skel->progs.prog_msg_verdict);
map = bpf_map__fd(skel->maps.sock_map);
err = bpf_prog_attach(verdict, map, BPF_SK_MSG_VERDICT, 0);
if (CHECK_FAIL(err)) {
perror("bpf_prog_attach");
goto out;
}
err = bpf_prog_detach2(verdict, map, BPF_SK_MSG_VERDICT);
if (CHECK_FAIL(err)) {
perror("bpf_prog_detach2");
goto out;
}
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, duration = 0;
struct test_sockmap_update *skel;
struct bpf_map *dst_map;
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"))
goto close_sk;
prog = bpf_program__fd(skel->progs.copy_sock_map);
src = bpf_map__fd(skel->maps.src);
if (map_type == BPF_MAP_TYPE_SOCKMAP)
dst_map = skel->maps.dst_sock_map;
else
dst_map = 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;
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;
compare_cookies(skel->maps.src, dst_map);
out:
test_sockmap_update__destroy(skel);
close_sk:
close(sk);
}
static void test_sockmap_invalid_update(void)
{
struct test_sockmap_invalid_update *skel;
int duration = 0;
skel = test_sockmap_invalid_update__open_and_load();
if (CHECK(skel, "open_and_load", "verifier accepted map_update\n"))
test_sockmap_invalid_update__destroy(skel);
}
static void test_sockmap_copy(enum bpf_map_type map_type)
{
DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts);
int err, len, src_fd, iter_fd, duration = 0;
union bpf_iter_link_info linfo = {};
__u32 i, num_sockets, num_elems;
struct bpf_iter_sockmap *skel;
__s64 *sock_fd = NULL;
struct bpf_link *link;
struct bpf_map *src;
char buf[64];
skel = bpf_iter_sockmap__open_and_load();
if (CHECK(!skel, "bpf_iter_sockmap__open_and_load", "skeleton open_and_load failed\n"))
return;
if (map_type == BPF_MAP_TYPE_SOCKMAP) {
src = skel->maps.sockmap;
num_elems = bpf_map__max_entries(src);
num_sockets = num_elems - 1;
} else {
src = skel->maps.sockhash;
num_elems = bpf_map__max_entries(src) - 1;
num_sockets = num_elems;
}
sock_fd = calloc(num_sockets, sizeof(*sock_fd));
if (CHECK(!sock_fd, "calloc(sock_fd)", "failed to allocate\n"))
goto out;
for (i = 0; i < num_sockets; i++)
sock_fd[i] = -1;
src_fd = bpf_map__fd(src);
for (i = 0; i < num_sockets; i++) {
sock_fd[i] = connected_socket_v4();
if (CHECK(sock_fd[i] == -1, "connected_socket_v4", "cannot connect\n"))
goto out;
err = bpf_map_update_elem(src_fd, &i, &sock_fd[i], BPF_NOEXIST);
if (CHECK(err, "map_update", "failed: %s\n", strerror(errno)))
goto out;
}
linfo.map.map_fd = src_fd;
opts.link_info = &linfo;
opts.link_info_len = sizeof(linfo);
link = bpf_program__attach_iter(skel->progs.copy, &opts);
if (!ASSERT_OK_PTR(link, "attach_iter"))
goto out;
iter_fd = bpf_iter_create(bpf_link__fd(link));
if (CHECK(iter_fd < 0, "create_iter", "create_iter failed\n"))
goto free_link;
/* do some tests */
while ((len = read(iter_fd, buf, sizeof(buf))) > 0)
;
if (CHECK(len < 0, "read", "failed: %s\n", strerror(errno)))
goto close_iter;
/* test results */
if (CHECK(skel->bss->elems != num_elems, "elems", "got %u expected %u\n",
skel->bss->elems, num_elems))
goto close_iter;
if (CHECK(skel->bss->socks != num_sockets, "socks", "got %u expected %u\n",
skel->bss->socks, num_sockets))
goto close_iter;
compare_cookies(src, skel->maps.dst);
close_iter:
close(iter_fd);
free_link:
bpf_link__destroy(link);
out:
for (i = 0; sock_fd && i < num_sockets; i++)
if (sock_fd[i] >= 0)
close(sock_fd[i]);
if (sock_fd)
free(sock_fd);
bpf_iter_sockmap__destroy(skel);
}
static void test_sockmap_skb_verdict_attach(enum bpf_attach_type first,
enum bpf_attach_type second)
{
struct test_sockmap_skb_verdict_attach *skel;
int err, map, verdict;
skel = test_sockmap_skb_verdict_attach__open_and_load();
if (CHECK_FAIL(!skel)) {
perror("test_sockmap_skb_verdict_attach__open_and_load");
return;
}
verdict = bpf_program__fd(skel->progs.prog_skb_verdict);
map = bpf_map__fd(skel->maps.sock_map);
err = bpf_prog_attach(verdict, map, first, 0);
if (CHECK_FAIL(err)) {
perror("bpf_prog_attach");
goto out;
}
err = bpf_prog_attach(verdict, map, second, 0);
ASSERT_EQ(err, -EBUSY, "prog_attach_fail");
err = bpf_prog_detach2(verdict, map, first);
if (CHECK_FAIL(err)) {
perror("bpf_prog_detach2");
goto out;
}
out:
test_sockmap_skb_verdict_attach__destroy(skel);
}
void test_sockmap_basic(void)
{
if (test__start_subtest("sockmap create_update_free"))
test_sockmap_create_update_free(BPF_MAP_TYPE_SOCKMAP);
if (test__start_subtest("sockhash create_update_free"))
test_sockmap_create_update_free(BPF_MAP_TYPE_SOCKHASH);
if (test__start_subtest("sockmap sk_msg load helpers"))
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();
if (test__start_subtest("sockmap copy"))
test_sockmap_copy(BPF_MAP_TYPE_SOCKMAP);
if (test__start_subtest("sockhash copy"))
test_sockmap_copy(BPF_MAP_TYPE_SOCKHASH);
if (test__start_subtest("sockmap skb_verdict attach")) {
test_sockmap_skb_verdict_attach(BPF_SK_SKB_VERDICT,
BPF_SK_SKB_STREAM_VERDICT);
test_sockmap_skb_verdict_attach(BPF_SK_SKB_STREAM_VERDICT,
BPF_SK_SKB_VERDICT);
}
}
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