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linux/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
John Fastabend 5f405c0c0c bpf, sockmap: Add tests for MSG_F_PEEK 
Test that we can read with MSG_F_PEEK and then still get correct number
of available bytes through FIONREAD. The recv() (without PEEK) then
returns the bytes as expected. The recv() always worked though because
it was just the available byte reporting that was broke before latest
fixes.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Link: https://lore.kernel.org/bpf/20230926035300.135096-4-john.fastabend@gmail.com
2023-09-29 17:06:21 +02:00

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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2020 Cloudflare
#include <error.h>
#include <netinet/tcp.h>
#include <sys/epoll.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 "test_sockmap_progs_query.skel.h"
#include "test_sockmap_pass_prog.skel.h"
#include "test_sockmap_drop_prog.skel.h"
#include "bpf_iter_sockmap.skel.h"
#include "sockmap_helpers.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 (!ASSERT_GE(s, 0, "socket"))
goto error;
repair = TCP_REPAIR_ON;
err = setsockopt(s, SOL_TCP, TCP_REPAIR, &repair, sizeof(repair));
if (!ASSERT_OK(err, "setsockopt(TCP_REPAIR)"))
goto error;
err = connect(s, (struct sockaddr *)&addr, len);
if (!ASSERT_OK(err, "connect"))
goto error;
repair = TCP_REPAIR_OFF_NO_WP;
err = setsockopt(s, SOL_TCP, TCP_REPAIR, &repair, sizeof(repair));
if (!ASSERT_OK(err, "setsockopt(TCP_REPAIR)"))
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, 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);
ASSERT_ERR(err, "map_lookup_elem(dst)");
ASSERT_EQ(errno, ENOENT, "map_lookup_elem(dst)");
continue;
}
if (!ASSERT_OK(err, "lookup_elem(src)"))
continue;
err = bpf_map_lookup_elem(dst_fd, &i, &dst_cookie);
if (!ASSERT_OK(err, "lookup_elem(dst)"))
continue;
ASSERT_EQ(dst_cookie, src_cookie, "cookie mismatch");
}
}
/* 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 (!ASSERT_GE(s, 0, "connected_socket_v4"))
return;
map = bpf_map_create(map_type, NULL, sizeof(int), sizeof(int), 1, NULL);
if (!ASSERT_GE(map, 0, "bpf_map_create"))
goto out;
err = bpf_map_update_elem(map, &zero, &s, BPF_NOEXIST);
if (!ASSERT_OK(err, "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 (!ASSERT_OK_PTR(skel, "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 (!ASSERT_OK(err, "bpf_prog_attach"))
goto out;
err = bpf_prog_detach2(verdict, map, BPF_SK_MSG_VERDICT);
if (!ASSERT_OK(err, "bpf_prog_detach2"))
goto out;
out:
test_skmsg_load_helpers__destroy(skel);
}
static void test_sockmap_update(enum bpf_map_type map_type)
{
int err, prog, src;
struct test_sockmap_update *skel;
struct bpf_map *dst_map;
const __u32 zero = 0;
char dummy[14] = {0};
LIBBPF_OPTS(bpf_test_run_opts, topts,
.data_in = dummy,
.data_size_in = sizeof(dummy),
.repeat = 1,
);
__s64 sk;
sk = connected_socket_v4();
if (!ASSERT_NEQ(sk, -1, "connected_socket_v4"))
return;
skel = test_sockmap_update__open_and_load();
if (!ASSERT_OK_PTR(skel, "open_and_load"))
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 (!ASSERT_OK(err, "update_elem(src)"))
goto out;
err = bpf_prog_test_run_opts(prog, &topts);
if (!ASSERT_OK(err, "test_run"))
goto out;
if (!ASSERT_NEQ(topts.retval, 0, "test_run 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;
skel = test_sockmap_invalid_update__open_and_load();
if (!ASSERT_NULL(skel, "open_and_load"))
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;
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 (!ASSERT_OK_PTR(skel, "bpf_iter_sockmap__open_and_load"))
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 (!ASSERT_OK_PTR(sock_fd, "calloc(sock_fd)"))
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 (!ASSERT_NEQ(sock_fd[i], -1, "connected_socket_v4"))
goto out;
err = bpf_map_update_elem(src_fd, &i, &sock_fd[i], BPF_NOEXIST);
if (!ASSERT_OK(err, "map_update"))
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 (!ASSERT_GE(iter_fd, 0, "create_iter"))
goto free_link;
/* do some tests */
while ((len = read(iter_fd, buf, sizeof(buf))) > 0)
;
if (!ASSERT_GE(len, 0, "read"))
goto close_iter;
/* test results */
if (!ASSERT_EQ(skel->bss->elems, num_elems, "elems"))
goto close_iter;
if (!ASSERT_EQ(skel->bss->socks, num_sockets, "socks"))
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 (!ASSERT_OK_PTR(skel, "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 (!ASSERT_OK(err, "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 (!ASSERT_OK(err, "bpf_prog_detach2"))
goto out;
out:
test_sockmap_skb_verdict_attach__destroy(skel);
}
static __u32 query_prog_id(int prog_fd)
{
struct bpf_prog_info info = {};
__u32 info_len = sizeof(info);
int err;
err = bpf_prog_get_info_by_fd(prog_fd, &info, &info_len);
if (!ASSERT_OK(err, "bpf_prog_get_info_by_fd") ||
!ASSERT_EQ(info_len, sizeof(info), "bpf_prog_get_info_by_fd"))
return 0;
return info.id;
}
static void test_sockmap_progs_query(enum bpf_attach_type attach_type)
{
struct test_sockmap_progs_query *skel;
int err, map_fd, verdict_fd;
__u32 attach_flags = 0;
__u32 prog_ids[3] = {};
__u32 prog_cnt = 3;
skel = test_sockmap_progs_query__open_and_load();
if (!ASSERT_OK_PTR(skel, "test_sockmap_progs_query__open_and_load"))
return;
map_fd = bpf_map__fd(skel->maps.sock_map);
if (attach_type == BPF_SK_MSG_VERDICT)
verdict_fd = bpf_program__fd(skel->progs.prog_skmsg_verdict);
else
verdict_fd = bpf_program__fd(skel->progs.prog_skb_verdict);
err = bpf_prog_query(map_fd, attach_type, 0 /* query flags */,
&attach_flags, prog_ids, &prog_cnt);
ASSERT_OK(err, "bpf_prog_query failed");
ASSERT_EQ(attach_flags, 0, "wrong attach_flags on query");
ASSERT_EQ(prog_cnt, 0, "wrong program count on query");
err = bpf_prog_attach(verdict_fd, map_fd, attach_type, 0);
if (!ASSERT_OK(err, "bpf_prog_attach failed"))
goto out;
prog_cnt = 1;
err = bpf_prog_query(map_fd, attach_type, 0 /* query flags */,
&attach_flags, prog_ids, &prog_cnt);
ASSERT_OK(err, "bpf_prog_query failed");
ASSERT_EQ(attach_flags, 0, "wrong attach_flags on query");
ASSERT_EQ(prog_cnt, 1, "wrong program count on query");
ASSERT_EQ(prog_ids[0], query_prog_id(verdict_fd),
"wrong prog_ids on query");
bpf_prog_detach2(verdict_fd, map_fd, attach_type);
out:
test_sockmap_progs_query__destroy(skel);
}
#define MAX_EVENTS 10
static void test_sockmap_skb_verdict_shutdown(void)
{
struct epoll_event ev, events[MAX_EVENTS];
int n, err, map, verdict, s, c1, p1;
struct test_sockmap_pass_prog *skel;
int epollfd;
int zero = 0;
char b;
skel = test_sockmap_pass_prog__open_and_load();
if (!ASSERT_OK_PTR(skel, "open_and_load"))
return;
verdict = bpf_program__fd(skel->progs.prog_skb_verdict);
map = bpf_map__fd(skel->maps.sock_map_rx);
err = bpf_prog_attach(verdict, map, BPF_SK_SKB_STREAM_VERDICT, 0);
if (!ASSERT_OK(err, "bpf_prog_attach"))
goto out;
s = socket_loopback(AF_INET, SOCK_STREAM);
if (s < 0)
goto out;
err = create_pair(s, AF_INET, SOCK_STREAM, &c1, &p1);
if (err < 0)
goto out;
err = bpf_map_update_elem(map, &zero, &c1, BPF_NOEXIST);
if (err < 0)
goto out_close;
shutdown(p1, SHUT_WR);
ev.events = EPOLLIN;
ev.data.fd = c1;
epollfd = epoll_create1(0);
if (!ASSERT_GT(epollfd, -1, "epoll_create(0)"))
goto out_close;
err = epoll_ctl(epollfd, EPOLL_CTL_ADD, c1, &ev);
if (!ASSERT_OK(err, "epoll_ctl(EPOLL_CTL_ADD)"))
goto out_close;
err = epoll_wait(epollfd, events, MAX_EVENTS, -1);
if (!ASSERT_EQ(err, 1, "epoll_wait(fd)"))
goto out_close;
n = recv(c1, &b, 1, SOCK_NONBLOCK);
ASSERT_EQ(n, 0, "recv_timeout(fin)");
out_close:
close(c1);
close(p1);
out:
test_sockmap_pass_prog__destroy(skel);
}
static void test_sockmap_skb_verdict_fionread(bool pass_prog)
{
int expected, zero = 0, sent, recvd, avail;
int err, map, verdict, s, c0, c1, p0, p1;
struct test_sockmap_pass_prog *pass;
struct test_sockmap_drop_prog *drop;
char buf[256] = "0123456789";
if (pass_prog) {
pass = test_sockmap_pass_prog__open_and_load();
if (!ASSERT_OK_PTR(pass, "open_and_load"))
return;
verdict = bpf_program__fd(pass->progs.prog_skb_verdict);
map = bpf_map__fd(pass->maps.sock_map_rx);
expected = sizeof(buf);
} else {
drop = test_sockmap_drop_prog__open_and_load();
if (!ASSERT_OK_PTR(drop, "open_and_load"))
return;
verdict = bpf_program__fd(drop->progs.prog_skb_verdict);
map = bpf_map__fd(drop->maps.sock_map_rx);
/* On drop data is consumed immediately and copied_seq inc'd */
expected = 0;
}
err = bpf_prog_attach(verdict, map, BPF_SK_SKB_STREAM_VERDICT, 0);
if (!ASSERT_OK(err, "bpf_prog_attach"))
goto out;
s = socket_loopback(AF_INET, SOCK_STREAM);
if (!ASSERT_GT(s, -1, "socket_loopback(s)"))
goto out;
err = create_socket_pairs(s, AF_INET, SOCK_STREAM, &c0, &c1, &p0, &p1);
if (!ASSERT_OK(err, "create_socket_pairs(s)"))
goto out;
err = bpf_map_update_elem(map, &zero, &c1, BPF_NOEXIST);
if (!ASSERT_OK(err, "bpf_map_update_elem(c1)"))
goto out_close;
sent = xsend(p1, &buf, sizeof(buf), 0);
ASSERT_EQ(sent, sizeof(buf), "xsend(p0)");
err = ioctl(c1, FIONREAD, &avail);
ASSERT_OK(err, "ioctl(FIONREAD) error");
ASSERT_EQ(avail, expected, "ioctl(FIONREAD)");
/* On DROP test there will be no data to read */
if (pass_prog) {
recvd = recv_timeout(c1, &buf, sizeof(buf), SOCK_NONBLOCK, IO_TIMEOUT_SEC);
ASSERT_EQ(recvd, sizeof(buf), "recv_timeout(c0)");
}
out_close:
close(c0);
close(p0);
close(c1);
close(p1);
out:
if (pass_prog)
test_sockmap_pass_prog__destroy(pass);
else
test_sockmap_drop_prog__destroy(drop);
}
static void test_sockmap_skb_verdict_peek(void)
{
int err, map, verdict, s, c1, p1, zero = 0, sent, recvd, avail;
struct test_sockmap_pass_prog *pass;
char snd[256] = "0123456789";
char rcv[256] = "0";
pass = test_sockmap_pass_prog__open_and_load();
if (!ASSERT_OK_PTR(pass, "open_and_load"))
return;
verdict = bpf_program__fd(pass->progs.prog_skb_verdict);
map = bpf_map__fd(pass->maps.sock_map_rx);
err = bpf_prog_attach(verdict, map, BPF_SK_SKB_STREAM_VERDICT, 0);
if (!ASSERT_OK(err, "bpf_prog_attach"))
goto out;
s = socket_loopback(AF_INET, SOCK_STREAM);
if (!ASSERT_GT(s, -1, "socket_loopback(s)"))
goto out;
err = create_pair(s, AF_INET, SOCK_STREAM, &c1, &p1);
if (!ASSERT_OK(err, "create_pairs(s)"))
goto out;
err = bpf_map_update_elem(map, &zero, &c1, BPF_NOEXIST);
if (!ASSERT_OK(err, "bpf_map_update_elem(c1)"))
goto out_close;
sent = xsend(p1, snd, sizeof(snd), 0);
ASSERT_EQ(sent, sizeof(snd), "xsend(p1)");
recvd = recv(c1, rcv, sizeof(rcv), MSG_PEEK);
ASSERT_EQ(recvd, sizeof(rcv), "recv(c1)");
err = ioctl(c1, FIONREAD, &avail);
ASSERT_OK(err, "ioctl(FIONREAD) error");
ASSERT_EQ(avail, sizeof(snd), "after peek ioctl(FIONREAD)");
recvd = recv(c1, rcv, sizeof(rcv), 0);
ASSERT_EQ(recvd, sizeof(rcv), "recv(p0)");
err = ioctl(c1, FIONREAD, &avail);
ASSERT_OK(err, "ioctl(FIONREAD) error");
ASSERT_EQ(avail, 0, "after read ioctl(FIONREAD)");
out_close:
close(c1);
close(p1);
out:
test_sockmap_pass_prog__destroy(pass);
}
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);
}
if (test__start_subtest("sockmap msg_verdict progs query"))
test_sockmap_progs_query(BPF_SK_MSG_VERDICT);
if (test__start_subtest("sockmap stream_parser progs query"))
test_sockmap_progs_query(BPF_SK_SKB_STREAM_PARSER);
if (test__start_subtest("sockmap stream_verdict progs query"))
test_sockmap_progs_query(BPF_SK_SKB_STREAM_VERDICT);
if (test__start_subtest("sockmap skb_verdict progs query"))
test_sockmap_progs_query(BPF_SK_SKB_VERDICT);
if (test__start_subtest("sockmap skb_verdict shutdown"))
test_sockmap_skb_verdict_shutdown();
if (test__start_subtest("sockmap skb_verdict fionread"))
test_sockmap_skb_verdict_fionread(true);
if (test__start_subtest("sockmap skb_verdict fionread on drop"))
test_sockmap_skb_verdict_fionread(false);
if (test__start_subtest("sockmap skb_verdict msg_f_peek"))
test_sockmap_skb_verdict_peek();
}
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