1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2024 Meta
#include <test_progs.h>
#include "network_helpers.h"
#include "sock_iter_batch.skel.h"
#define TEST_NS "sock_iter_batch_netns"
static const int nr_soreuse = 4;
static void do_test(int sock_type, bool onebyone)
{
int err, i, nread, to_read, total_read, iter_fd = -1;
int first_idx, second_idx, indices[nr_soreuse];
struct bpf_link *link = NULL;
struct sock_iter_batch *skel;
int *fds[2] = {};
skel = sock_iter_batch__open();
if (!ASSERT_OK_PTR(skel, "sock_iter_batch__open"))
return;
/* Prepare 2 buckets of sockets in the kernel hashtable */
for (i = 0; i < ARRAY_SIZE(fds); i++) {
int local_port;
fds[i] = start_reuseport_server(AF_INET6, sock_type, "::1", 0, 0,
nr_soreuse);
if (!ASSERT_OK_PTR(fds[i], "start_reuseport_server"))
goto done;
local_port = get_socket_local_port(*fds[i]);
if (!ASSERT_GE(local_port, 0, "get_socket_local_port"))
goto done;
skel->rodata->ports[i] = ntohs(local_port);
}
err = sock_iter_batch__load(skel);
if (!ASSERT_OK(err, "sock_iter_batch__load"))
goto done;
link = bpf_program__attach_iter(sock_type == SOCK_STREAM ?
skel->progs.iter_tcp_soreuse :
skel->progs.iter_udp_soreuse,
NULL);
if (!ASSERT_OK_PTR(link, "bpf_program__attach_iter"))
goto done;
iter_fd = bpf_iter_create(bpf_link__fd(link));
if (!ASSERT_GE(iter_fd, 0, "bpf_iter_create"))
goto done;
/* Test reading a bucket (either from fds[0] or fds[1]).
* Only read "nr_soreuse - 1" number of sockets
* from a bucket and leave one socket out from
* that bucket on purpose.
*/
to_read = (nr_soreuse - 1) * sizeof(*indices);
total_read = 0;
first_idx = -1;
do {
nread = read(iter_fd, indices, onebyone ? sizeof(*indices) : to_read);
if (nread <= 0 || nread % sizeof(*indices))
break;
total_read += nread;
if (first_idx == -1)
first_idx = indices[0];
for (i = 0; i < nread / sizeof(*indices); i++)
ASSERT_EQ(indices[i], first_idx, "first_idx");
} while (total_read < to_read);
ASSERT_EQ(nread, onebyone ? sizeof(*indices) : to_read, "nread");
ASSERT_EQ(total_read, to_read, "total_read");
free_fds(fds[first_idx], nr_soreuse);
fds[first_idx] = NULL;
/* Read the "whole" second bucket */
to_read = nr_soreuse * sizeof(*indices);
total_read = 0;
second_idx = !first_idx;
do {
nread = read(iter_fd, indices, onebyone ? sizeof(*indices) : to_read);
if (nread <= 0 || nread % sizeof(*indices))
break;
total_read += nread;
for (i = 0; i < nread / sizeof(*indices); i++)
ASSERT_EQ(indices[i], second_idx, "second_idx");
} while (total_read <= to_read);
ASSERT_EQ(nread, 0, "nread");
/* Both so_reuseport ports should be in different buckets, so
* total_read must equal to the expected to_read.
*
* For a very unlikely case, both ports collide at the same bucket,
* the bucket offset (i.e. 3) will be skipped and it cannot
* expect the to_read number of bytes.
*/
if (skel->bss->bucket[0] != skel->bss->bucket[1])
ASSERT_EQ(total_read, to_read, "total_read");
done:
for (i = 0; i < ARRAY_SIZE(fds); i++)
free_fds(fds[i], nr_soreuse);
if (iter_fd < 0)
close(iter_fd);
bpf_link__destroy(link);
sock_iter_batch__destroy(skel);
}
void test_sock_iter_batch(void)
{
struct nstoken *nstoken = NULL;
SYS_NOFAIL("ip netns del " TEST_NS);
SYS(done, "ip netns add %s", TEST_NS);
SYS(done, "ip -net %s link set dev lo up", TEST_NS);
nstoken = open_netns(TEST_NS);
if (!ASSERT_OK_PTR(nstoken, "open_netns"))
goto done;
if (test__start_subtest("tcp")) {
do_test(SOCK_STREAM, true);
do_test(SOCK_STREAM, false);
}
if (test__start_subtest("udp")) {
do_test(SOCK_DGRAM, true);
do_test(SOCK_DGRAM, false);
}
close_netns(nstoken);
done:
SYS_NOFAIL("ip netns del " TEST_NS);
}
|
