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586d87021f
Setup trace points, add a new ftrace instance in order to not interfere with the rest of the system, filtering by net namespace cookies. Raise a new background thread that parses trace_pipe, matches them with the list of expected events. Wiring up trace events to selftests provides another insight if there is anything unexpected happining in the tcp-ao code (i.e. key rotation when it's not expected). Note: in real programs libtraceevent should be used instead of this manual labor of setting ftrace up and parsing. I'm not using it here as I don't want to have an .so library dependency that one would have to bring into VM or DUT (Device Under Test). Please, don't copy it over into any real world programs, that aren't tests. Signed-off-by: Dmitry Safonov <0x7f454c46@gmail.com> Link: https://patch.msgid.link/20240823-tcp-ao-selftests-upd-6-12-v4-8-05623636fe8c@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
253 lines
8.1 KiB
C
253 lines
8.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Author: Dmitry Safonov <dima@arista.com> */
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/* This is over-simplified TCP_REPAIR for TCP_ESTABLISHED sockets
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* It tests that TCP-AO enabled connection can be restored.
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* For the proper socket repair see:
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* https://github.com/checkpoint-restore/criu/blob/criu-dev/soccr/soccr.h
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*/
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#include <inttypes.h>
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#include "aolib.h"
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const size_t nr_packets = 20;
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const size_t msg_len = 100;
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const size_t quota = nr_packets * msg_len;
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#define fault(type) (inj == FAULT_ ## type)
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static void try_server_run(const char *tst_name, unsigned int port,
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fault_t inj, test_cnt cnt_expected)
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{
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const char *cnt_name = "TCPAOGood";
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struct tcp_ao_counters ao1, ao2;
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uint64_t before_cnt, after_cnt;
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int sk, lsk;
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time_t timeout;
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ssize_t bytes;
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if (fault(TIMEOUT))
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cnt_name = "TCPAOBad";
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lsk = test_listen_socket(this_ip_addr, port, 1);
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if (test_add_key(lsk, DEFAULT_TEST_PASSWORD, this_ip_dest, -1, 100, 100))
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test_error("setsockopt(TCP_AO_ADD_KEY)");
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synchronize_threads(); /* 1: MKT added => connect() */
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if (test_wait_fd(lsk, TEST_TIMEOUT_SEC, 0))
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test_error("test_wait_fd()");
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sk = accept(lsk, NULL, NULL);
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if (sk < 0)
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test_error("accept()");
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synchronize_threads(); /* 2: accepted => send data */
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close(lsk);
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bytes = test_server_run(sk, quota, TEST_TIMEOUT_SEC);
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if (bytes != quota) {
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test_fail("%s: server served: %zd", tst_name, bytes);
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goto out;
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}
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before_cnt = netstat_get_one(cnt_name, NULL);
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if (test_get_tcp_ao_counters(sk, &ao1))
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test_error("test_get_tcp_ao_counters()");
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timeout = fault(TIMEOUT) ? TEST_RETRANSMIT_SEC : TEST_TIMEOUT_SEC;
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bytes = test_server_run(sk, quota, timeout);
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if (fault(TIMEOUT)) {
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if (bytes > 0)
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test_fail("%s: server served: %zd", tst_name, bytes);
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else
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test_ok("%s: server couldn't serve", tst_name);
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} else {
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if (bytes != quota)
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test_fail("%s: server served: %zd", tst_name, bytes);
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else
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test_ok("%s: server alive", tst_name);
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}
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synchronize_threads(); /* 3: counters checks */
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if (test_get_tcp_ao_counters(sk, &ao2))
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test_error("test_get_tcp_ao_counters()");
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after_cnt = netstat_get_one(cnt_name, NULL);
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test_tcp_ao_counters_cmp(tst_name, &ao1, &ao2, cnt_expected);
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if (after_cnt <= before_cnt) {
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test_fail("%s: %s counter did not increase: %" PRIu64 " <= %" PRIu64,
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tst_name, cnt_name, after_cnt, before_cnt);
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} else {
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test_ok("%s: counter %s increased %" PRIu64 " => %" PRIu64,
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tst_name, cnt_name, before_cnt, after_cnt);
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}
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/*
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* Before close() as that will send FIN and move the peer in TCP_CLOSE
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* and that will prevent reading AO counters from the peer's socket.
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*/
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synchronize_threads(); /* 4: verified => closed */
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out:
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close(sk);
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}
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static void *server_fn(void *arg)
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{
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unsigned int port = test_server_port;
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try_server_run("TCP-AO migrate to another socket", port++,
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0, TEST_CNT_GOOD);
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try_server_run("TCP-AO with wrong send ISN", port++,
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FAULT_TIMEOUT, TEST_CNT_BAD);
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try_server_run("TCP-AO with wrong receive ISN", port++,
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FAULT_TIMEOUT, TEST_CNT_BAD);
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try_server_run("TCP-AO with wrong send SEQ ext number", port++,
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FAULT_TIMEOUT, TEST_CNT_BAD);
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try_server_run("TCP-AO with wrong receive SEQ ext number", port++,
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FAULT_TIMEOUT, TEST_CNT_NS_BAD | TEST_CNT_GOOD);
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synchronize_threads(); /* don't race to exit: client exits */
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return NULL;
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}
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static void test_get_sk_checkpoint(unsigned int server_port, sockaddr_af *saddr,
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struct tcp_sock_state *img,
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struct tcp_ao_repair *ao_img)
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{
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int sk;
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sk = socket(test_family, SOCK_STREAM, IPPROTO_TCP);
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if (sk < 0)
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test_error("socket()");
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if (test_add_key(sk, DEFAULT_TEST_PASSWORD, this_ip_dest, -1, 100, 100))
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test_error("setsockopt(TCP_AO_ADD_KEY)");
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synchronize_threads(); /* 1: MKT added => connect() */
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if (test_connect_socket(sk, this_ip_dest, server_port) <= 0)
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test_error("failed to connect()");
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synchronize_threads(); /* 2: accepted => send data */
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if (test_client_verify(sk, msg_len, nr_packets, TEST_TIMEOUT_SEC))
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test_fail("pre-migrate verify failed");
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test_enable_repair(sk);
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test_sock_checkpoint(sk, img, saddr);
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test_ao_checkpoint(sk, ao_img);
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test_kill_sk(sk);
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}
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static void test_sk_restore(const char *tst_name, unsigned int server_port,
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sockaddr_af *saddr, struct tcp_sock_state *img,
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struct tcp_ao_repair *ao_img,
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fault_t inj, test_cnt cnt_expected)
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{
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const char *cnt_name = "TCPAOGood";
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struct tcp_ao_counters ao1, ao2;
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uint64_t before_cnt, after_cnt;
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time_t timeout;
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int sk;
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if (fault(TIMEOUT))
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cnt_name = "TCPAOBad";
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before_cnt = netstat_get_one(cnt_name, NULL);
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sk = socket(test_family, SOCK_STREAM, IPPROTO_TCP);
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if (sk < 0)
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test_error("socket()");
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test_enable_repair(sk);
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test_sock_restore(sk, img, saddr, this_ip_dest, server_port);
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if (test_add_repaired_key(sk, DEFAULT_TEST_PASSWORD, 0, this_ip_dest, -1, 100, 100))
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test_error("setsockopt(TCP_AO_ADD_KEY)");
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test_ao_restore(sk, ao_img);
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if (test_get_tcp_ao_counters(sk, &ao1))
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test_error("test_get_tcp_ao_counters()");
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test_disable_repair(sk);
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test_sock_state_free(img);
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timeout = fault(TIMEOUT) ? TEST_RETRANSMIT_SEC : TEST_TIMEOUT_SEC;
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if (test_client_verify(sk, msg_len, nr_packets, timeout)) {
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if (fault(TIMEOUT))
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test_ok("%s: post-migrate connection is broken", tst_name);
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else
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test_fail("%s: post-migrate connection is working", tst_name);
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} else {
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if (fault(TIMEOUT))
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test_fail("%s: post-migrate connection still working", tst_name);
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else
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test_ok("%s: post-migrate connection is alive", tst_name);
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}
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synchronize_threads(); /* 3: counters checks */
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if (test_get_tcp_ao_counters(sk, &ao2))
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test_error("test_get_tcp_ao_counters()");
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after_cnt = netstat_get_one(cnt_name, NULL);
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test_tcp_ao_counters_cmp(tst_name, &ao1, &ao2, cnt_expected);
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if (after_cnt <= before_cnt) {
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test_fail("%s: %s counter did not increase: %" PRIu64 " <= %" PRIu64,
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tst_name, cnt_name, after_cnt, before_cnt);
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} else {
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test_ok("%s: counter %s increased %" PRIu64 " => %" PRIu64,
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tst_name, cnt_name, before_cnt, after_cnt);
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}
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synchronize_threads(); /* 4: verified => closed */
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close(sk);
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}
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static void *client_fn(void *arg)
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{
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unsigned int port = test_server_port;
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struct tcp_sock_state tcp_img;
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struct tcp_ao_repair ao_img;
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sockaddr_af saddr;
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test_get_sk_checkpoint(port, &saddr, &tcp_img, &ao_img);
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test_sk_restore("TCP-AO migrate to another socket", port++,
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&saddr, &tcp_img, &ao_img, 0, TEST_CNT_GOOD);
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test_get_sk_checkpoint(port, &saddr, &tcp_img, &ao_img);
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ao_img.snt_isn += 1;
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trace_ao_event_expect(TCP_AO_MISMATCH, this_ip_addr, this_ip_dest,
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-1, port, 0, -1, -1, -1, -1, -1, 100, 100, -1);
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trace_ao_event_expect(TCP_AO_MISMATCH, this_ip_dest, this_ip_addr,
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port, -1, 0, -1, -1, -1, -1, -1, 100, 100, -1);
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test_sk_restore("TCP-AO with wrong send ISN", port++,
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&saddr, &tcp_img, &ao_img, FAULT_TIMEOUT, TEST_CNT_BAD);
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test_get_sk_checkpoint(port, &saddr, &tcp_img, &ao_img);
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ao_img.rcv_isn += 1;
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trace_ao_event_expect(TCP_AO_MISMATCH, this_ip_addr, this_ip_dest,
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-1, port, 0, -1, -1, -1, -1, -1, 100, 100, -1);
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trace_ao_event_expect(TCP_AO_MISMATCH, this_ip_dest, this_ip_addr,
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port, -1, 0, -1, -1, -1, -1, -1, 100, 100, -1);
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test_sk_restore("TCP-AO with wrong receive ISN", port++,
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&saddr, &tcp_img, &ao_img, FAULT_TIMEOUT, TEST_CNT_BAD);
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test_get_sk_checkpoint(port, &saddr, &tcp_img, &ao_img);
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ao_img.snd_sne += 1;
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trace_ao_event_expect(TCP_AO_MISMATCH, this_ip_addr, this_ip_dest,
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-1, port, 0, -1, -1, -1, -1, -1, 100, 100, -1);
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/* not expecting server => client mismatches as only snd sne is broken */
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test_sk_restore("TCP-AO with wrong send SEQ ext number", port++,
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&saddr, &tcp_img, &ao_img, FAULT_TIMEOUT,
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TEST_CNT_NS_BAD | TEST_CNT_GOOD);
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test_get_sk_checkpoint(port, &saddr, &tcp_img, &ao_img);
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ao_img.rcv_sne += 1;
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/* not expecting client => server mismatches as only rcv sne is broken */
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trace_ao_event_expect(TCP_AO_MISMATCH, this_ip_dest, this_ip_addr,
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port, -1, 0, -1, -1, -1, -1, -1, 100, 100, -1);
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test_sk_restore("TCP-AO with wrong receive SEQ ext number", port++,
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&saddr, &tcp_img, &ao_img, FAULT_TIMEOUT,
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TEST_CNT_NS_GOOD | TEST_CNT_BAD);
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return NULL;
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}
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int main(int argc, char *argv[])
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{
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test_init(21, server_fn, client_fn);
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return 0;
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}
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