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selftests/net: Add TCP-AO RST test
Check that both active and passive reset works and correctly sign
segments with TCP-AO or don't send RSTs if not possible to sign.
A listening socket with backlog = 0 gets one connection in accept
queue, another in syn queue. Once the server/listener socket is
forcibly closed, client sockets aren't connected to anything.
In regular situation they would receive RST on any segment, but
with TCP-AO as there's no listener, no AO-key and unknown ISNs,
no RST should be sent.
And "passive" reset, where RST is sent on reply for some segment
(tcp_v{4,6}_send_reset()) - there use TCP_REPAIR to corrupt SEQ numbers,
which later results in TCP-AO signed RST, which will be verified and
client socket will get EPIPE.
No TCPAORequired/TCPAOBad segments are expected during these tests.
Sample of the output:
> # ./rst_ipv4
> 1..15
> # 1462[lib/setup.c:254] rand seed 1686611171
> TAP version 13
> ok 1 servered 1000 bytes
> ok 2 Verified established tcp connection
> ok 3 sk[0] = 7, connection was reset
> ok 4 sk[1] = 8, connection was reset
> ok 5 sk[2] = 9
> ok 6 MKT counters are good on server
> ok 7 Verified established tcp connection
> ok 8 client connection broken post-seq-adjust
> ok 9 client connection was reset
> ok 10 No segments without AO sign (server)
> ok 11 Signed AO segments (server): 0 => 30
> ok 12 No segments with bad AO sign (server)
> ok 13 No segments without AO sign (client)
> ok 14 Signed AO segments (client): 0 => 30
> ok 15 No segments with bad AO sign (client)
> # Totals: pass:15 fail:0 xfail:0 xpass:0 skip:0 error:0
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmitry Safonov
David S. Miller
parent
0d16eae574
commit
c6df7b2361
3 changed files with 417 additions and 1 deletions
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@ -4,6 +4,7 @@ TEST_BOTH_AF += connect
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TEST_BOTH_AF += connect-deny
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TEST_BOTH_AF += icmps-accept icmps-discard
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TEST_BOTH_AF += restore
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TEST_BOTH_AF += rst
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TEST_BOTH_AF += seq-ext
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TEST_BOTH_AF += setsockopt-closed
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TEST_BOTH_AF += unsigned-md5
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@ -566,7 +566,7 @@ ssize_t test_client_loop(int sk, char *buf, size_t buf_sz,
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got = recv(sk, msg + bytes, sizeof(msg) - bytes, 0);
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if (got <= 0)
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test_error("recv(): %zd", got);
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return i;
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bytes += got;
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} while (bytes < sent);
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if (bytes > sent)
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415
tools/testing/selftests/net/tcp_ao/rst.c
Normal file
415
tools/testing/selftests/net/tcp_ao/rst.c
Normal file
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@ -0,0 +1,415 @@
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// SPDX-License-Identifier: GPL-2.0
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/* Author: Dmitry Safonov <dima@arista.com> */
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#include <inttypes.h>
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#include "../../../../include/linux/kernel.h"
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#include "aolib.h"
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const size_t quota = 1000;
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/*
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* Backlog == 0 means 1 connection in queue, see:
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* commit 64a146513f8f ("[NET]: Revert incorrect accept queue...")
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*/
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const unsigned int backlog;
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static void netstats_check(struct netstat *before, struct netstat *after,
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char *msg)
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{
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uint64_t before_cnt, after_cnt;
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before_cnt = netstat_get(before, "TCPAORequired", NULL);
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after_cnt = netstat_get(after, "TCPAORequired", NULL);
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if (after_cnt > before_cnt)
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test_fail("Segments without AO sign (%s): %" PRIu64 " => %" PRIu64,
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msg, before_cnt, after_cnt);
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else
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test_ok("No segments without AO sign (%s)", msg);
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before_cnt = netstat_get(before, "TCPAOGood", NULL);
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after_cnt = netstat_get(after, "TCPAOGood", NULL);
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if (after_cnt <= before_cnt)
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test_fail("Signed AO segments (%s): %" PRIu64 " => %" PRIu64,
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msg, before_cnt, after_cnt);
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else
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test_ok("Signed AO segments (%s): %" PRIu64 " => %" PRIu64,
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msg, before_cnt, after_cnt);
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before_cnt = netstat_get(before, "TCPAOBad", NULL);
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after_cnt = netstat_get(after, "TCPAOBad", NULL);
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if (after_cnt > before_cnt)
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test_fail("Segments with bad AO sign (%s): %" PRIu64 " => %" PRIu64,
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msg, before_cnt, after_cnt);
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else
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test_ok("No segments with bad AO sign (%s)", msg);
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}
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/*
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* Another way to send RST, but not through tcp_v{4,6}_send_reset()
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* is tcp_send_active_reset(), that is not in reply to inbound segment,
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* but rather active send. It uses tcp_transmit_skb(), so that should
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* work, but as it also sends RST - nice that it can be covered as well.
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*/
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static void close_forced(int sk)
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{
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struct linger sl;
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sl.l_onoff = 1;
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sl.l_linger = 0;
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if (setsockopt(sk, SOL_SOCKET, SO_LINGER, &sl, sizeof(sl)))
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test_error("setsockopt(SO_LINGER)");
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close(sk);
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}
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static int test_wait_for_exception(int sk, time_t sec)
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{
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struct timeval tv = { .tv_sec = sec };
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struct timeval *ptv = NULL;
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fd_set efds;
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int ret;
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FD_ZERO(&efds);
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FD_SET(sk, &efds);
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if (sec)
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ptv = &tv;
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errno = 0;
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ret = select(sk + 1, NULL, NULL, &efds, ptv);
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if (ret < 0)
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return -errno;
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return ret ? sk : 0;
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}
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static void test_server_active_rst(unsigned int port)
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{
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struct tcp_ao_counters cnt1, cnt2;
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ssize_t bytes;
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int sk, lsk;
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lsk = test_listen_socket(this_ip_addr, port, backlog);
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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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if (test_get_tcp_ao_counters(lsk, &cnt1))
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test_error("test_get_tcp_ao_counters()");
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synchronize_threads(); /* 1: MKT added */
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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: connection accept()ed, another queued */
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if (test_get_tcp_ao_counters(lsk, &cnt2))
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test_error("test_get_tcp_ao_counters()");
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synchronize_threads(); /* 3: close listen socket */
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close(lsk);
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bytes = test_server_run(sk, quota, 0);
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if (bytes != quota)
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test_error("servered only %zd bytes", bytes);
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else
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test_ok("servered %zd bytes", bytes);
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synchronize_threads(); /* 4: finishing up */
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close_forced(sk);
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synchronize_threads(); /* 5: closed active sk */
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synchronize_threads(); /* 6: counters checks */
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if (test_tcp_ao_counters_cmp("active RST server", &cnt1, &cnt2, TEST_CNT_GOOD))
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test_fail("MKT counters (server) have not only good packets");
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else
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test_ok("MKT counters are good on server");
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}
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static void test_server_passive_rst(unsigned int port)
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{
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struct tcp_ao_counters ao1, ao2;
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int sk, lsk;
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ssize_t bytes;
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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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if (test_get_tcp_ao_counters(sk, &ao1))
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test_error("test_get_tcp_ao_counters()");
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bytes = test_server_run(sk, quota, TEST_TIMEOUT_SEC);
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if (bytes != quota) {
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if (bytes > 0)
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test_fail("server served: %zd", bytes);
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else
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test_fail("server returned %zd", bytes);
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}
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synchronize_threads(); /* 3: chekpoint/restore the connection */
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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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synchronize_threads(); /* 4: terminate server + send more on client */
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bytes = test_server_run(sk, quota, TEST_RETRANSMIT_SEC);
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close(sk);
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test_tcp_ao_counters_cmp("passive RST server", &ao1, &ao2, TEST_CNT_GOOD);
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synchronize_threads(); /* 5: verified => closed */
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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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struct netstat *ns_before, *ns_after;
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unsigned int port = test_server_port;
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ns_before = netstat_read();
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test_server_active_rst(port++);
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test_server_passive_rst(port++);
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ns_after = netstat_read();
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netstats_check(ns_before, ns_after, "server");
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netstat_free(ns_after);
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netstat_free(ns_before);
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synchronize_threads(); /* exit */
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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 int test_wait_fds(int sk[], size_t nr, bool is_writable[],
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ssize_t wait_for, time_t sec)
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{
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struct timeval tv = { .tv_sec = sec };
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struct timeval *ptv = NULL;
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fd_set left;
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size_t i;
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int ret;
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FD_ZERO(&left);
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for (i = 0; i < nr; i++) {
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FD_SET(sk[i], &left);
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if (is_writable)
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is_writable[i] = false;
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}
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if (sec)
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ptv = &tv;
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do {
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bool is_empty = true;
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fd_set fds, efds;
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int nfd = 0;
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FD_ZERO(&fds);
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FD_ZERO(&efds);
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for (i = 0; i < nr; i++) {
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if (!FD_ISSET(sk[i], &left))
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continue;
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if (sk[i] > nfd)
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nfd = sk[i];
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FD_SET(sk[i], &fds);
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FD_SET(sk[i], &efds);
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is_empty = false;
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}
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if (is_empty)
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return -ENOENT;
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errno = 0;
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ret = select(nfd + 1, NULL, &fds, &efds, ptv);
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if (ret < 0)
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return -errno;
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if (!ret)
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return -ETIMEDOUT;
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for (i = 0; i < nr; i++) {
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if (FD_ISSET(sk[i], &fds)) {
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if (is_writable)
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is_writable[i] = true;
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FD_CLR(sk[i], &left);
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wait_for--;
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continue;
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}
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if (FD_ISSET(sk[i], &efds)) {
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FD_CLR(sk[i], &left);
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wait_for--;
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}
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}
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} while (wait_for > 0);
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return 0;
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}
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static void test_client_active_rst(unsigned int port)
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{
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/* one in queue, another accept()ed */
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unsigned int wait_for = backlog + 2;
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int i, sk[3], err;
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bool is_writable[ARRAY_SIZE(sk)] = {false};
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unsigned int last = ARRAY_SIZE(sk) - 1;
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for (i = 0; i < ARRAY_SIZE(sk); i++) {
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sk[i] = socket(test_family, SOCK_STREAM, IPPROTO_TCP);
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if (sk[i] < 0)
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test_error("socket()");
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if (test_add_key(sk[i], DEFAULT_TEST_PASSWORD,
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this_ip_dest, -1, 100, 100))
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test_error("setsockopt(TCP_AO_ADD_KEY)");
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}
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synchronize_threads(); /* 1: MKT added */
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for (i = 0; i < last; i++) {
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err = _test_connect_socket(sk[i], this_ip_dest, port,
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(i == 0) ? TEST_TIMEOUT_SEC : -1);
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if (err < 0)
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test_error("failed to connect()");
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}
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synchronize_threads(); /* 2: connection accept()ed, another queued */
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err = test_wait_fds(sk, last, is_writable, wait_for, TEST_TIMEOUT_SEC);
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if (err < 0)
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test_error("test_wait_fds(): %d", err);
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synchronize_threads(); /* 3: close listen socket */
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if (test_client_verify(sk[0], 100, quota / 100, TEST_TIMEOUT_SEC))
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test_fail("Failed to send data on connected socket");
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else
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test_ok("Verified established tcp connection");
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synchronize_threads(); /* 4: finishing up */
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err = _test_connect_socket(sk[last], this_ip_dest, port, -1);
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if (err < 0)
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test_error("failed to connect()");
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synchronize_threads(); /* 5: closed active sk */
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err = test_wait_fds(sk, ARRAY_SIZE(sk), NULL,
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wait_for, TEST_TIMEOUT_SEC);
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if (err < 0)
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test_error("select(): %d", err);
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for (i = 0; i < ARRAY_SIZE(sk); i++) {
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socklen_t slen = sizeof(err);
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if (getsockopt(sk[i], SOL_SOCKET, SO_ERROR, &err, &slen))
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test_error("getsockopt()");
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if (is_writable[i] && err != ECONNRESET) {
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test_fail("sk[%d] = %d, err = %d, connection wasn't reset",
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i, sk[i], err);
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} else {
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test_ok("sk[%d] = %d%s", i, sk[i],
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is_writable[i] ? ", connection was reset" : "");
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}
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}
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synchronize_threads(); /* 6: counters checks */
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}
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static void test_client_passive_rst(unsigned int port)
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{
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struct tcp_ao_counters ao1, ao2;
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struct tcp_ao_repair ao_img;
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struct tcp_sock_state img;
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sockaddr_af saddr;
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int sk, err;
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socklen_t slen = sizeof(err);
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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, 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, 100, quota / 100, TEST_TIMEOUT_SEC))
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test_fail("Failed to send data on connected socket");
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else
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test_ok("Verified established tcp connection");
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synchronize_threads(); /* 3: chekpoint/restore the connection */
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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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img.out.seq += quota;
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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, 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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synchronize_threads(); /* 4: terminate server + send more on client */
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if (test_client_verify(sk, 100, quota / 100, 2 * TEST_TIMEOUT_SEC))
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test_ok("client connection broken post-seq-adjust");
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else
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test_fail("client connection still works post-seq-adjust");
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test_wait_for_exception(sk, TEST_TIMEOUT_SEC);
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if (getsockopt(sk, SOL_SOCKET, SO_ERROR, &err, &slen))
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test_error("getsockopt()");
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if (err != ECONNRESET && err != EPIPE)
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test_fail("client connection was not reset: %d", err);
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else
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test_ok("client connection was reset");
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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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synchronize_threads(); /* 5: verified => closed */
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close(sk);
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test_tcp_ao_counters_cmp("client passive RST", &ao1, &ao2, TEST_CNT_GOOD);
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}
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static void *client_fn(void *arg)
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{
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struct netstat *ns_before, *ns_after;
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unsigned int port = test_server_port;
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ns_before = netstat_read();
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|
||||
test_client_active_rst(port++);
|
||||
test_client_passive_rst(port++);
|
||||
|
||||
ns_after = netstat_read();
|
||||
netstats_check(ns_before, ns_after, "client");
|
||||
netstat_free(ns_after);
|
||||
netstat_free(ns_before);
|
||||
|
||||
synchronize_threads(); /* exit */
|
||||
return NULL;
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
test_init(15, server_fn, client_fn);
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in a new issue