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1// SPDX-License-Identifier: GPL-2.0
2/* This is over-simplified TCP_REPAIR for TCP_ESTABLISHED sockets
3 * It tests that TCP-AO enabled connection can be restored.
4 * For the proper socket repair see:
5 * https://github.com/checkpoint-restore/criu/blob/criu-dev/soccr/soccr.h
6 */
7#include <fcntl.h>
8#include <linux/sockios.h>
9#include <sys/ioctl.h>
10#include "aolib.h"
11
12#ifndef TCPOPT_MAXSEG
13# define TCPOPT_MAXSEG 2
14#endif
15#ifndef TCPOPT_WINDOW
16# define TCPOPT_WINDOW 3
17#endif
18#ifndef TCPOPT_SACK_PERMITTED
19# define TCPOPT_SACK_PERMITTED 4
20#endif
21#ifndef TCPOPT_TIMESTAMP
22# define TCPOPT_TIMESTAMP 8
23#endif
24
25enum {
26 TCP_ESTABLISHED = 1,
27 TCP_SYN_SENT,
28 TCP_SYN_RECV,
29 TCP_FIN_WAIT1,
30 TCP_FIN_WAIT2,
31 TCP_TIME_WAIT,
32 TCP_CLOSE,
33 TCP_CLOSE_WAIT,
34 TCP_LAST_ACK,
35 TCP_LISTEN,
36 TCP_CLOSING, /* Now a valid state */
37 TCP_NEW_SYN_RECV,
38
39 TCP_MAX_STATES /* Leave at the end! */
40};
41
42static void test_sock_checkpoint_queue(int sk, int queue, int qlen,
43 struct tcp_sock_queue *q)
44{
45 socklen_t len;
46 int ret;
47
48 if (setsockopt(sk, SOL_TCP, TCP_REPAIR_QUEUE, &queue, sizeof(queue)))
49 test_error("setsockopt(TCP_REPAIR_QUEUE)");
50
51 len = sizeof(q->seq);
52 ret = getsockopt(sk, SOL_TCP, TCP_QUEUE_SEQ, &q->seq, &len);
53 if (ret || len != sizeof(q->seq))
54 test_error("getsockopt(TCP_QUEUE_SEQ): %d", (int)len);
55
56 if (!qlen) {
57 q->buf = NULL;
58 return;
59 }
60
61 q->buf = malloc(qlen);
62 if (q->buf == NULL)
63 test_error("malloc()");
64 ret = recv(sk, q->buf, qlen, MSG_PEEK | MSG_DONTWAIT);
65 if (ret != qlen)
66 test_error("recv(%d): %d", qlen, ret);
67}
68
69void __test_sock_checkpoint(int sk, struct tcp_sock_state *state,
70 void *addr, size_t addr_size)
71{
72 socklen_t len = sizeof(state->info);
73 int ret;
74
75 memset(state, 0, sizeof(*state));
76
77 ret = getsockopt(sk, SOL_TCP, TCP_INFO, &state->info, &len);
78 if (ret || len != sizeof(state->info))
79 test_error("getsockopt(TCP_INFO): %d", (int)len);
80
81 len = addr_size;
82 if (getsockname(sk, addr, &len) || len != addr_size)
83 test_error("getsockname(): %d", (int)len);
84
85 len = sizeof(state->trw);
86 ret = getsockopt(sk, SOL_TCP, TCP_REPAIR_WINDOW, &state->trw, &len);
87 if (ret || len != sizeof(state->trw))
88 test_error("getsockopt(TCP_REPAIR_WINDOW): %d", (int)len);
89
90 if (ioctl(sk, SIOCOUTQ, &state->outq_len))
91 test_error("ioctl(SIOCOUTQ)");
92
93 if (ioctl(sk, SIOCOUTQNSD, &state->outq_nsd_len))
94 test_error("ioctl(SIOCOUTQNSD)");
95 test_sock_checkpoint_queue(sk, TCP_SEND_QUEUE, state->outq_len, &state->out);
96
97 if (ioctl(sk, SIOCINQ, &state->inq_len))
98 test_error("ioctl(SIOCINQ)");
99 test_sock_checkpoint_queue(sk, TCP_RECV_QUEUE, state->inq_len, &state->in);
100
101 if (state->info.tcpi_state == TCP_CLOSE)
102 state->outq_len = state->outq_nsd_len = 0;
103
104 len = sizeof(state->mss);
105 ret = getsockopt(sk, SOL_TCP, TCP_MAXSEG, &state->mss, &len);
106 if (ret || len != sizeof(state->mss))
107 test_error("getsockopt(TCP_MAXSEG): %d", (int)len);
108
109 len = sizeof(state->timestamp);
110 ret = getsockopt(sk, SOL_TCP, TCP_TIMESTAMP, &state->timestamp, &len);
111 if (ret || len != sizeof(state->timestamp))
112 test_error("getsockopt(TCP_TIMESTAMP): %d", (int)len);
113}
114
115void test_ao_checkpoint(int sk, struct tcp_ao_repair *state)
116{
117 socklen_t len = sizeof(*state);
118 int ret;
119
120 memset(state, 0, sizeof(*state));
121
122 ret = getsockopt(sk, SOL_TCP, TCP_AO_REPAIR, state, &len);
123 if (ret || len != sizeof(*state))
124 test_error("getsockopt(TCP_AO_REPAIR): %d", (int)len);
125}
126
127static void test_sock_restore_seq(int sk, int queue, uint32_t seq)
128{
129 if (setsockopt(sk, SOL_TCP, TCP_REPAIR_QUEUE, &queue, sizeof(queue)))
130 test_error("setsockopt(TCP_REPAIR_QUEUE)");
131
132 if (setsockopt(sk, SOL_TCP, TCP_QUEUE_SEQ, &seq, sizeof(seq)))
133 test_error("setsockopt(TCP_QUEUE_SEQ)");
134}
135
136static void test_sock_restore_queue(int sk, int queue, void *buf, int len)
137{
138 int chunk = len;
139 size_t off = 0;
140
141 if (len == 0)
142 return;
143
144 if (setsockopt(sk, SOL_TCP, TCP_REPAIR_QUEUE, &queue, sizeof(queue)))
145 test_error("setsockopt(TCP_REPAIR_QUEUE)");
146
147 do {
148 int ret;
149
150 ret = send(sk, buf + off, chunk, 0);
151 if (ret <= 0) {
152 if (chunk > 1024) {
153 chunk >>= 1;
154 continue;
155 }
156 test_error("send()");
157 }
158 off += ret;
159 len -= ret;
160 } while (len > 0);
161}
162
163void __test_sock_restore(int sk, const char *device,
164 struct tcp_sock_state *state,
165 void *saddr, void *daddr, size_t addr_size)
166{
167 struct tcp_repair_opt opts[4];
168 unsigned int opt_nr = 0;
169 long flags;
170
171 if (bind(sk, saddr, addr_size))
172 test_error("bind()");
173
174 flags = fcntl(sk, F_GETFL);
175 if ((flags < 0) || (fcntl(sk, F_SETFL, flags | O_NONBLOCK) < 0))
176 test_error("fcntl()");
177
178 test_sock_restore_seq(sk, TCP_RECV_QUEUE, state->in.seq - state->inq_len);
179 test_sock_restore_seq(sk, TCP_SEND_QUEUE, state->out.seq - state->outq_len);
180
181 if (device != NULL && setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
182 device, strlen(device) + 1))
183 test_error("setsockopt(SO_BINDTODEVICE, %s)", device);
184
185 if (connect(sk, daddr, addr_size))
186 test_error("connect()");
187
188 if (state->info.tcpi_options & TCPI_OPT_SACK) {
189 opts[opt_nr].opt_code = TCPOPT_SACK_PERMITTED;
190 opts[opt_nr].opt_val = 0;
191 opt_nr++;
192 }
193 if (state->info.tcpi_options & TCPI_OPT_WSCALE) {
194 opts[opt_nr].opt_code = TCPOPT_WINDOW;
195 opts[opt_nr].opt_val = state->info.tcpi_snd_wscale +
196 (state->info.tcpi_rcv_wscale << 16);
197 opt_nr++;
198 }
199 if (state->info.tcpi_options & TCPI_OPT_TIMESTAMPS) {
200 opts[opt_nr].opt_code = TCPOPT_TIMESTAMP;
201 opts[opt_nr].opt_val = 0;
202 opt_nr++;
203 }
204 opts[opt_nr].opt_code = TCPOPT_MAXSEG;
205 opts[opt_nr].opt_val = state->mss;
206 opt_nr++;
207
208 if (setsockopt(sk, SOL_TCP, TCP_REPAIR_OPTIONS, opts, opt_nr * sizeof(opts[0])))
209 test_error("setsockopt(TCP_REPAIR_OPTIONS)");
210
211 if (state->info.tcpi_options & TCPI_OPT_TIMESTAMPS) {
212 if (setsockopt(sk, SOL_TCP, TCP_TIMESTAMP,
213 &state->timestamp, opt_nr * sizeof(opts[0])))
214 test_error("setsockopt(TCP_TIMESTAMP)");
215 }
216 test_sock_restore_queue(sk, TCP_RECV_QUEUE, state->in.buf, state->inq_len);
217 test_sock_restore_queue(sk, TCP_SEND_QUEUE, state->out.buf, state->outq_len);
218 if (setsockopt(sk, SOL_TCP, TCP_REPAIR_WINDOW, &state->trw, sizeof(state->trw)))
219 test_error("setsockopt(TCP_REPAIR_WINDOW)");
220}
221
222void test_ao_restore(int sk, struct tcp_ao_repair *state)
223{
224 if (setsockopt(sk, SOL_TCP, TCP_AO_REPAIR, state, sizeof(*state)))
225 test_error("setsockopt(TCP_AO_REPAIR)");
226}
227
228void test_sock_state_free(struct tcp_sock_state *state)
229{
230 free(state->out.buf);
231 free(state->in.buf);
232}
233
234void test_enable_repair(int sk)
235{
236 int val = TCP_REPAIR_ON;
237
238 if (setsockopt(sk, SOL_TCP, TCP_REPAIR, &val, sizeof(val)))
239 test_error("setsockopt(TCP_REPAIR)");
240}
241
242void test_disable_repair(int sk)
243{
244 int val = TCP_REPAIR_OFF_NO_WP;
245
246 if (setsockopt(sk, SOL_TCP, TCP_REPAIR, &val, sizeof(val)))
247 test_error("setsockopt(TCP_REPAIR)");
248}
249
250void test_kill_sk(int sk)
251{
252 test_enable_repair(sk);
253 close(sk);
254}