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// SPDX-License-Identifier: GPL-2.0
/* This is over-simplified TCP_REPAIR for TCP_ESTABLISHED sockets
* It tests that TCP-AO enabled connection can be restored.
* For the proper socket repair see:
* https://github.com/checkpoint-restore/criu/blob/criu-dev/soccr/soccr.h
*/
#include <fcntl.h>
#include <linux/sockios.h>
#include <sys/ioctl.h>
#include "aolib.h"
#ifndef TCPOPT_MAXSEG
# define TCPOPT_MAXSEG 2
#endif
#ifndef TCPOPT_WINDOW
# define TCPOPT_WINDOW 3
#endif
#ifndef TCPOPT_SACK_PERMITTED
# define TCPOPT_SACK_PERMITTED 4
#endif
#ifndef TCPOPT_TIMESTAMP
# define TCPOPT_TIMESTAMP 8
#endif
enum {
TCP_ESTABLISHED = 1,
TCP_SYN_SENT,
TCP_SYN_RECV,
TCP_FIN_WAIT1,
TCP_FIN_WAIT2,
TCP_TIME_WAIT,
TCP_CLOSE,
TCP_CLOSE_WAIT,
TCP_LAST_ACK,
TCP_LISTEN,
TCP_CLOSING, /* Now a valid state */
TCP_NEW_SYN_RECV,
TCP_MAX_STATES /* Leave at the end! */
};
static void test_sock_checkpoint_queue(int sk, int queue, int qlen,
struct tcp_sock_queue *q)
{
socklen_t len;
int ret;
if (setsockopt(sk, SOL_TCP, TCP_REPAIR_QUEUE, &queue, sizeof(queue)))
test_error("setsockopt(TCP_REPAIR_QUEUE)");
len = sizeof(q->seq);
ret = getsockopt(sk, SOL_TCP, TCP_QUEUE_SEQ, &q->seq, &len);
if (ret || len != sizeof(q->seq))
test_error("getsockopt(TCP_QUEUE_SEQ): %d", (int)len);
if (!qlen) {
q->buf = NULL;
return;
}
q->buf = malloc(qlen);
if (q->buf == NULL)
test_error("malloc()");
ret = recv(sk, q->buf, qlen, MSG_PEEK | MSG_DONTWAIT);
if (ret != qlen)
test_error("recv(%d): %d", qlen, ret);
}
void __test_sock_checkpoint(int sk, struct tcp_sock_state *state,
void *addr, size_t addr_size)
{
socklen_t len = sizeof(state->info);
int ret;
memset(state, 0, sizeof(*state));
ret = getsockopt(sk, SOL_TCP, TCP_INFO, &state->info, &len);
if (ret || len != sizeof(state->info))
test_error("getsockopt(TCP_INFO): %d", (int)len);
len = addr_size;
if (getsockname(sk, addr, &len) || len != addr_size)
test_error("getsockname(): %d", (int)len);
len = sizeof(state->trw);
ret = getsockopt(sk, SOL_TCP, TCP_REPAIR_WINDOW, &state->trw, &len);
if (ret || len != sizeof(state->trw))
test_error("getsockopt(TCP_REPAIR_WINDOW): %d", (int)len);
if (ioctl(sk, SIOCOUTQ, &state->outq_len))
test_error("ioctl(SIOCOUTQ)");
if (ioctl(sk, SIOCOUTQNSD, &state->outq_nsd_len))
test_error("ioctl(SIOCOUTQNSD)");
test_sock_checkpoint_queue(sk, TCP_SEND_QUEUE, state->outq_len, &state->out);
if (ioctl(sk, SIOCINQ, &state->inq_len))
test_error("ioctl(SIOCINQ)");
test_sock_checkpoint_queue(sk, TCP_RECV_QUEUE, state->inq_len, &state->in);
if (state->info.tcpi_state == TCP_CLOSE)
state->outq_len = state->outq_nsd_len = 0;
len = sizeof(state->mss);
ret = getsockopt(sk, SOL_TCP, TCP_MAXSEG, &state->mss, &len);
if (ret || len != sizeof(state->mss))
test_error("getsockopt(TCP_MAXSEG): %d", (int)len);
len = sizeof(state->timestamp);
ret = getsockopt(sk, SOL_TCP, TCP_TIMESTAMP, &state->timestamp, &len);
if (ret || len != sizeof(state->timestamp))
test_error("getsockopt(TCP_TIMESTAMP): %d", (int)len);
}
void test_ao_checkpoint(int sk, struct tcp_ao_repair *state)
{
socklen_t len = sizeof(*state);
int ret;
memset(state, 0, sizeof(*state));
ret = getsockopt(sk, SOL_TCP, TCP_AO_REPAIR, state, &len);
if (ret || len != sizeof(*state))
test_error("getsockopt(TCP_AO_REPAIR): %d", (int)len);
}
static void test_sock_restore_seq(int sk, int queue, uint32_t seq)
{
if (setsockopt(sk, SOL_TCP, TCP_REPAIR_QUEUE, &queue, sizeof(queue)))
test_error("setsockopt(TCP_REPAIR_QUEUE)");
if (setsockopt(sk, SOL_TCP, TCP_QUEUE_SEQ, &seq, sizeof(seq)))
test_error("setsockopt(TCP_QUEUE_SEQ)");
}
static void test_sock_restore_queue(int sk, int queue, void *buf, int len)
{
int chunk = len;
size_t off = 0;
if (len == 0)
return;
if (setsockopt(sk, SOL_TCP, TCP_REPAIR_QUEUE, &queue, sizeof(queue)))
test_error("setsockopt(TCP_REPAIR_QUEUE)");
do {
int ret;
ret = send(sk, buf + off, chunk, 0);
if (ret <= 0) {
if (chunk > 1024) {
chunk >>= 1;
continue;
}
test_error("send()");
}
off += ret;
len -= ret;
} while (len > 0);
}
void __test_sock_restore(int sk, const char *device,
struct tcp_sock_state *state,
void *saddr, void *daddr, size_t addr_size)
{
struct tcp_repair_opt opts[4];
unsigned int opt_nr = 0;
long flags;
if (bind(sk, saddr, addr_size))
test_error("bind()");
flags = fcntl(sk, F_GETFL);
if ((flags < 0) || (fcntl(sk, F_SETFL, flags | O_NONBLOCK) < 0))
test_error("fcntl()");
test_sock_restore_seq(sk, TCP_RECV_QUEUE, state->in.seq - state->inq_len);
test_sock_restore_seq(sk, TCP_SEND_QUEUE, state->out.seq - state->outq_len);
if (device != NULL && setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
device, strlen(device) + 1))
test_error("setsockopt(SO_BINDTODEVICE, %s)", device);
if (connect(sk, daddr, addr_size))
test_error("connect()");
if (state->info.tcpi_options & TCPI_OPT_SACK) {
opts[opt_nr].opt_code = TCPOPT_SACK_PERMITTED;
opts[opt_nr].opt_val = 0;
opt_nr++;
}
if (state->info.tcpi_options & TCPI_OPT_WSCALE) {
opts[opt_nr].opt_code = TCPOPT_WINDOW;
opts[opt_nr].opt_val = state->info.tcpi_snd_wscale +
(state->info.tcpi_rcv_wscale << 16);
opt_nr++;
}
if (state->info.tcpi_options & TCPI_OPT_TIMESTAMPS) {
opts[opt_nr].opt_code = TCPOPT_TIMESTAMP;
opts[opt_nr].opt_val = 0;
opt_nr++;
}
opts[opt_nr].opt_code = TCPOPT_MAXSEG;
opts[opt_nr].opt_val = state->mss;
opt_nr++;
if (setsockopt(sk, SOL_TCP, TCP_REPAIR_OPTIONS, opts, opt_nr * sizeof(opts[0])))
test_error("setsockopt(TCP_REPAIR_OPTIONS)");
if (state->info.tcpi_options & TCPI_OPT_TIMESTAMPS) {
if (setsockopt(sk, SOL_TCP, TCP_TIMESTAMP,
&state->timestamp, opt_nr * sizeof(opts[0])))
test_error("setsockopt(TCP_TIMESTAMP)");
}
test_sock_restore_queue(sk, TCP_RECV_QUEUE, state->in.buf, state->inq_len);
test_sock_restore_queue(sk, TCP_SEND_QUEUE, state->out.buf, state->outq_len);
if (setsockopt(sk, SOL_TCP, TCP_REPAIR_WINDOW, &state->trw, sizeof(state->trw)))
test_error("setsockopt(TCP_REPAIR_WINDOW)");
}
void test_ao_restore(int sk, struct tcp_ao_repair *state)
{
if (setsockopt(sk, SOL_TCP, TCP_AO_REPAIR, state, sizeof(*state)))
test_error("setsockopt(TCP_AO_REPAIR)");
}
void test_sock_state_free(struct tcp_sock_state *state)
{
free(state->out.buf);
free(state->in.buf);
}
void test_enable_repair(int sk)
{
int val = TCP_REPAIR_ON;
if (setsockopt(sk, SOL_TCP, TCP_REPAIR, &val, sizeof(val)))
test_error("setsockopt(TCP_REPAIR)");
}
void test_disable_repair(int sk)
{
int val = TCP_REPAIR_OFF_NO_WP;
if (setsockopt(sk, SOL_TCP, TCP_REPAIR, &val, sizeof(val)))
test_error("setsockopt(TCP_REPAIR)");
}
void test_kill_sk(int sk)
{
test_enable_repair(sk);
close(sk);
}
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