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1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2023 Isovalent */
3#include <uapi/linux/if_link.h>
4#include <test_progs.h>
5
6#include <netinet/tcp.h>
7#include <netinet/udp.h>
8
9#include "network_helpers.h"
10#include "test_assign_reuse.skel.h"
11
12#define NS_TEST "assign_reuse"
13#define LOOPBACK 1
14#define PORT 4443
15
16static int attach_reuseport(int sock_fd, int prog_fd)
17{
18 return setsockopt(sock_fd, SOL_SOCKET, SO_ATTACH_REUSEPORT_EBPF,
19 &prog_fd, sizeof(prog_fd));
20}
21
22static __u64 cookie(int fd)
23{
24 __u64 cookie = 0;
25 socklen_t cookie_len = sizeof(cookie);
26 int ret;
27
28 ret = getsockopt(fd, SOL_SOCKET, SO_COOKIE, &cookie, &cookie_len);
29 ASSERT_OK(ret, "cookie");
30 ASSERT_GT(cookie, 0, "cookie_invalid");
31
32 return cookie;
33}
34
35static int echo_test_udp(int fd_sv)
36{
37 struct sockaddr_storage addr = {};
38 socklen_t len = sizeof(addr);
39 char buff[1] = {};
40 int fd_cl = -1, ret;
41
42 fd_cl = connect_to_fd(fd_sv, 100);
43 ASSERT_GT(fd_cl, 0, "create_client");
44 ASSERT_EQ(getsockname(fd_cl, (void *)&addr, &len), 0, "getsockname");
45
46 ASSERT_EQ(send(fd_cl, buff, sizeof(buff), 0), 1, "send_client");
47
48 ret = recv(fd_sv, buff, sizeof(buff), 0);
49 if (ret < 0) {
50 close(fd_cl);
51 return errno;
52 }
53
54 ASSERT_EQ(ret, 1, "recv_server");
55 ASSERT_EQ(sendto(fd_sv, buff, sizeof(buff), 0, (void *)&addr, len), 1, "send_server");
56 ASSERT_EQ(recv(fd_cl, buff, sizeof(buff), 0), 1, "recv_client");
57 close(fd_cl);
58 return 0;
59}
60
61static int echo_test_tcp(int fd_sv)
62{
63 char buff[1] = {};
64 int fd_cl = -1, fd_sv_cl = -1;
65
66 fd_cl = connect_to_fd(fd_sv, 100);
67 if (fd_cl < 0)
68 return errno;
69
70 fd_sv_cl = accept(fd_sv, NULL, NULL);
71 ASSERT_GE(fd_sv_cl, 0, "accept_fd");
72
73 ASSERT_EQ(send(fd_cl, buff, sizeof(buff), 0), 1, "send_client");
74 ASSERT_EQ(recv(fd_sv_cl, buff, sizeof(buff), 0), 1, "recv_server");
75 ASSERT_EQ(send(fd_sv_cl, buff, sizeof(buff), 0), 1, "send_server");
76 ASSERT_EQ(recv(fd_cl, buff, sizeof(buff), 0), 1, "recv_client");
77 close(fd_sv_cl);
78 close(fd_cl);
79 return 0;
80}
81
82void run_assign_reuse(int family, int sotype, const char *ip, __u16 port)
83{
84 DECLARE_LIBBPF_OPTS(bpf_tc_hook, tc_hook,
85 .ifindex = LOOPBACK,
86 .attach_point = BPF_TC_INGRESS,
87 );
88 DECLARE_LIBBPF_OPTS(bpf_tc_opts, tc_opts,
89 .handle = 1,
90 .priority = 1,
91 );
92 bool hook_created = false, tc_attached = false;
93 int ret, fd_tc, fd_accept, fd_drop, fd_map;
94 int *fd_sv = NULL;
95 __u64 fd_val;
96 struct test_assign_reuse *skel;
97 const int zero = 0;
98
99 skel = test_assign_reuse__open();
100 if (!ASSERT_OK_PTR(skel, "skel_open"))
101 goto cleanup;
102
103 skel->rodata->dest_port = port;
104
105 ret = test_assign_reuse__load(skel);
106 if (!ASSERT_OK(ret, "skel_load"))
107 goto cleanup;
108
109 ASSERT_EQ(skel->bss->sk_cookie_seen, 0, "cookie_init");
110
111 fd_tc = bpf_program__fd(skel->progs.tc_main);
112 fd_accept = bpf_program__fd(skel->progs.reuse_accept);
113 fd_drop = bpf_program__fd(skel->progs.reuse_drop);
114 fd_map = bpf_map__fd(skel->maps.sk_map);
115
116 fd_sv = start_reuseport_server(family, sotype, ip, port, 100, 1);
117 if (!ASSERT_NEQ(fd_sv, NULL, "start_reuseport_server"))
118 goto cleanup;
119
120 ret = attach_reuseport(*fd_sv, fd_drop);
121 if (!ASSERT_OK(ret, "attach_reuseport"))
122 goto cleanup;
123
124 fd_val = *fd_sv;
125 ret = bpf_map_update_elem(fd_map, &zero, &fd_val, BPF_NOEXIST);
126 if (!ASSERT_OK(ret, "bpf_sk_map"))
127 goto cleanup;
128
129 ret = bpf_tc_hook_create(&tc_hook);
130 if (ret == 0)
131 hook_created = true;
132 ret = ret == -EEXIST ? 0 : ret;
133 if (!ASSERT_OK(ret, "bpf_tc_hook_create"))
134 goto cleanup;
135
136 tc_opts.prog_fd = fd_tc;
137 ret = bpf_tc_attach(&tc_hook, &tc_opts);
138 if (!ASSERT_OK(ret, "bpf_tc_attach"))
139 goto cleanup;
140 tc_attached = true;
141
142 if (sotype == SOCK_STREAM)
143 ASSERT_EQ(echo_test_tcp(*fd_sv), ECONNREFUSED, "drop_tcp");
144 else
145 ASSERT_EQ(echo_test_udp(*fd_sv), EAGAIN, "drop_udp");
146 ASSERT_EQ(skel->bss->reuseport_executed, 1, "program executed once");
147
148 skel->bss->sk_cookie_seen = 0;
149 skel->bss->reuseport_executed = 0;
150 ASSERT_OK(attach_reuseport(*fd_sv, fd_accept), "attach_reuseport(accept)");
151
152 if (sotype == SOCK_STREAM)
153 ASSERT_EQ(echo_test_tcp(*fd_sv), 0, "echo_tcp");
154 else
155 ASSERT_EQ(echo_test_udp(*fd_sv), 0, "echo_udp");
156
157 ASSERT_EQ(skel->bss->sk_cookie_seen, cookie(*fd_sv),
158 "cookie_mismatch");
159 ASSERT_EQ(skel->bss->reuseport_executed, 1, "program executed once");
160cleanup:
161 if (tc_attached) {
162 tc_opts.flags = tc_opts.prog_fd = tc_opts.prog_id = 0;
163 ret = bpf_tc_detach(&tc_hook, &tc_opts);
164 ASSERT_OK(ret, "bpf_tc_detach");
165 }
166 if (hook_created) {
167 tc_hook.attach_point = BPF_TC_INGRESS | BPF_TC_EGRESS;
168 bpf_tc_hook_destroy(&tc_hook);
169 }
170 test_assign_reuse__destroy(skel);
171 free_fds(fd_sv, 1);
172}
173
174void test_assign_reuse(void)
175{
176 struct nstoken *tok = NULL;
177
178 SYS(out, "ip netns add %s", NS_TEST);
179 SYS(cleanup, "ip -net %s link set dev lo up", NS_TEST);
180
181 tok = open_netns(NS_TEST);
182 if (!ASSERT_OK_PTR(tok, "netns token"))
183 return;
184
185 if (test__start_subtest("tcpv4"))
186 run_assign_reuse(AF_INET, SOCK_STREAM, "127.0.0.1", PORT);
187 if (test__start_subtest("tcpv6"))
188 run_assign_reuse(AF_INET6, SOCK_STREAM, "::1", PORT);
189 if (test__start_subtest("udpv4"))
190 run_assign_reuse(AF_INET, SOCK_DGRAM, "127.0.0.1", PORT);
191 if (test__start_subtest("udpv6"))
192 run_assign_reuse(AF_INET6, SOCK_DGRAM, "::1", PORT);
193
194cleanup:
195 close_netns(tok);
196 SYS_NOFAIL("ip netns delete %s", NS_TEST);
197out:
198 return;
199}
1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2023 Isovalent */
3#include <uapi/linux/if_link.h>
4#include <test_progs.h>
5
6#include <netinet/tcp.h>
7#include <netinet/udp.h>
8
9#include "network_helpers.h"
10#include "test_assign_reuse.skel.h"
11
12#define NS_TEST "assign_reuse"
13#define LOOPBACK 1
14#define PORT 4443
15
16static int attach_reuseport(int sock_fd, int prog_fd)
17{
18 return setsockopt(sock_fd, SOL_SOCKET, SO_ATTACH_REUSEPORT_EBPF,
19 &prog_fd, sizeof(prog_fd));
20}
21
22static __u64 cookie(int fd)
23{
24 __u64 cookie = 0;
25 socklen_t cookie_len = sizeof(cookie);
26 int ret;
27
28 ret = getsockopt(fd, SOL_SOCKET, SO_COOKIE, &cookie, &cookie_len);
29 ASSERT_OK(ret, "cookie");
30 ASSERT_GT(cookie, 0, "cookie_invalid");
31
32 return cookie;
33}
34
35static int echo_test_udp(int fd_sv)
36{
37 struct sockaddr_storage addr = {};
38 socklen_t len = sizeof(addr);
39 char buff[1] = {};
40 int fd_cl = -1, ret;
41
42 fd_cl = connect_to_fd(fd_sv, 100);
43 ASSERT_GT(fd_cl, 0, "create_client");
44 ASSERT_EQ(getsockname(fd_cl, (void *)&addr, &len), 0, "getsockname");
45
46 ASSERT_EQ(send(fd_cl, buff, sizeof(buff), 0), 1, "send_client");
47
48 ret = recv(fd_sv, buff, sizeof(buff), 0);
49 if (ret < 0) {
50 close(fd_cl);
51 return errno;
52 }
53
54 ASSERT_EQ(ret, 1, "recv_server");
55 ASSERT_EQ(sendto(fd_sv, buff, sizeof(buff), 0, (void *)&addr, len), 1, "send_server");
56 ASSERT_EQ(recv(fd_cl, buff, sizeof(buff), 0), 1, "recv_client");
57 close(fd_cl);
58 return 0;
59}
60
61static int echo_test_tcp(int fd_sv)
62{
63 char buff[1] = {};
64 int fd_cl = -1, fd_sv_cl = -1;
65
66 fd_cl = connect_to_fd(fd_sv, 100);
67 if (fd_cl < 0)
68 return errno;
69
70 fd_sv_cl = accept(fd_sv, NULL, NULL);
71 ASSERT_GE(fd_sv_cl, 0, "accept_fd");
72
73 ASSERT_EQ(send(fd_cl, buff, sizeof(buff), 0), 1, "send_client");
74 ASSERT_EQ(recv(fd_sv_cl, buff, sizeof(buff), 0), 1, "recv_server");
75 ASSERT_EQ(send(fd_sv_cl, buff, sizeof(buff), 0), 1, "send_server");
76 ASSERT_EQ(recv(fd_cl, buff, sizeof(buff), 0), 1, "recv_client");
77 close(fd_sv_cl);
78 close(fd_cl);
79 return 0;
80}
81
82void run_assign_reuse(int family, int sotype, const char *ip, __u16 port)
83{
84 DECLARE_LIBBPF_OPTS(bpf_tc_hook, tc_hook,
85 .ifindex = LOOPBACK,
86 .attach_point = BPF_TC_INGRESS,
87 );
88 DECLARE_LIBBPF_OPTS(bpf_tc_opts, tc_opts,
89 .handle = 1,
90 .priority = 1,
91 );
92 bool hook_created = false, tc_attached = false;
93 int ret, fd_tc, fd_accept, fd_drop, fd_map;
94 int *fd_sv = NULL;
95 __u64 fd_val;
96 struct test_assign_reuse *skel;
97 const int zero = 0;
98
99 skel = test_assign_reuse__open();
100 if (!ASSERT_OK_PTR(skel, "skel_open"))
101 goto cleanup;
102
103 skel->rodata->dest_port = port;
104
105 ret = test_assign_reuse__load(skel);
106 if (!ASSERT_OK(ret, "skel_load"))
107 goto cleanup;
108
109 ASSERT_EQ(skel->bss->sk_cookie_seen, 0, "cookie_init");
110
111 fd_tc = bpf_program__fd(skel->progs.tc_main);
112 fd_accept = bpf_program__fd(skel->progs.reuse_accept);
113 fd_drop = bpf_program__fd(skel->progs.reuse_drop);
114 fd_map = bpf_map__fd(skel->maps.sk_map);
115
116 fd_sv = start_reuseport_server(family, sotype, ip, port, 100, 1);
117 if (!ASSERT_NEQ(fd_sv, NULL, "start_reuseport_server"))
118 goto cleanup;
119
120 ret = attach_reuseport(*fd_sv, fd_drop);
121 if (!ASSERT_OK(ret, "attach_reuseport"))
122 goto cleanup;
123
124 fd_val = *fd_sv;
125 ret = bpf_map_update_elem(fd_map, &zero, &fd_val, BPF_NOEXIST);
126 if (!ASSERT_OK(ret, "bpf_sk_map"))
127 goto cleanup;
128
129 ret = bpf_tc_hook_create(&tc_hook);
130 if (ret == 0)
131 hook_created = true;
132 ret = ret == -EEXIST ? 0 : ret;
133 if (!ASSERT_OK(ret, "bpf_tc_hook_create"))
134 goto cleanup;
135
136 tc_opts.prog_fd = fd_tc;
137 ret = bpf_tc_attach(&tc_hook, &tc_opts);
138 if (!ASSERT_OK(ret, "bpf_tc_attach"))
139 goto cleanup;
140 tc_attached = true;
141
142 if (sotype == SOCK_STREAM)
143 ASSERT_EQ(echo_test_tcp(*fd_sv), ECONNREFUSED, "drop_tcp");
144 else
145 ASSERT_EQ(echo_test_udp(*fd_sv), EAGAIN, "drop_udp");
146 ASSERT_EQ(skel->bss->reuseport_executed, 1, "program executed once");
147
148 skel->bss->sk_cookie_seen = 0;
149 skel->bss->reuseport_executed = 0;
150 ASSERT_OK(attach_reuseport(*fd_sv, fd_accept), "attach_reuseport(accept)");
151
152 if (sotype == SOCK_STREAM)
153 ASSERT_EQ(echo_test_tcp(*fd_sv), 0, "echo_tcp");
154 else
155 ASSERT_EQ(echo_test_udp(*fd_sv), 0, "echo_udp");
156
157 ASSERT_EQ(skel->bss->sk_cookie_seen, cookie(*fd_sv),
158 "cookie_mismatch");
159 ASSERT_EQ(skel->bss->reuseport_executed, 1, "program executed once");
160cleanup:
161 if (tc_attached) {
162 tc_opts.flags = tc_opts.prog_fd = tc_opts.prog_id = 0;
163 ret = bpf_tc_detach(&tc_hook, &tc_opts);
164 ASSERT_OK(ret, "bpf_tc_detach");
165 }
166 if (hook_created) {
167 tc_hook.attach_point = BPF_TC_INGRESS | BPF_TC_EGRESS;
168 bpf_tc_hook_destroy(&tc_hook);
169 }
170 test_assign_reuse__destroy(skel);
171 free_fds(fd_sv, 1);
172}
173
174void test_assign_reuse(void)
175{
176 struct nstoken *tok = NULL;
177
178 SYS(out, "ip netns add %s", NS_TEST);
179 SYS(cleanup, "ip -net %s link set dev lo up", NS_TEST);
180
181 tok = open_netns(NS_TEST);
182 if (!ASSERT_OK_PTR(tok, "netns token"))
183 return;
184
185 if (test__start_subtest("tcpv4"))
186 run_assign_reuse(AF_INET, SOCK_STREAM, "127.0.0.1", PORT);
187 if (test__start_subtest("tcpv6"))
188 run_assign_reuse(AF_INET6, SOCK_STREAM, "::1", PORT);
189 if (test__start_subtest("udpv4"))
190 run_assign_reuse(AF_INET, SOCK_DGRAM, "127.0.0.1", PORT);
191 if (test__start_subtest("udpv6"))
192 run_assign_reuse(AF_INET6, SOCK_DGRAM, "::1", PORT);
193
194cleanup:
195 close_netns(tok);
196 SYS_NOFAIL("ip netns delete %s", NS_TEST);
197out:
198 return;
199}