selftest: add test for TCP_INQ

Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
index df9102ec7b7af4b707a9a28c3f077d7a473f6067..0a1821f8dfb18604c34beca9e1d000947c5bbf1d 100644 (file)
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -9,7 +9,7 @@ TEST_PROGS += fib_tests.sh fib-onlink-tests.sh in_netns.sh pmtu.sh udpgso.sh
 TEST_PROGS += udpgso_bench.sh
 TEST_GEN_FILES =  socket
 TEST_GEN_FILES += psock_fanout psock_tpacket msg_zerocopy
-TEST_GEN_FILES += tcp_mmap
+TEST_GEN_FILES += tcp_mmap tcp_inq
 TEST_GEN_PROGS = reuseport_bpf reuseport_bpf_cpu reuseport_bpf_numa
 TEST_GEN_PROGS += reuseport_dualstack reuseaddr_conflict
 TEST_GEN_PROGS += udpgso udpgso_bench_tx udpgso_bench_rx
@@ -18,3 +18,4 @@ include ../lib.mk
 
 $(OUTPUT)/reuseport_bpf_numa: LDFLAGS += -lnuma
 $(OUTPUT)/tcp_mmap: LDFLAGS += -lpthread
+$(OUTPUT)/tcp_inq: LDFLAGS += -lpthread

diff --git a/tools/testing/selftests/net/tcp_inq.c b/tools/testing/selftests/net/tcp_inq.c
new file mode 100644 (file)
index 0000000..d044b29
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_inq.c
@@ -0,0 +1,189 @@
+/*
+ * Copyright 2018 Google Inc.
+ * Author: Soheil Hassas Yeganeh (soheil@google.com)
+ *
+ * Simple example on how to use TCP_INQ and TCP_CM_INQ.
+ *
+ * License (GPLv2):
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for
+ * more details.
+ */
+#define _GNU_SOURCE
+
+#include <error.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#ifndef TCP_INQ
+#define TCP_INQ 36
+#endif
+
+#ifndef TCP_CM_INQ
+#define TCP_CM_INQ TCP_INQ
+#endif
+
+#define BUF_SIZE 8192
+#define CMSG_SIZE 32
+
+static int family = AF_INET6;
+static socklen_t addr_len = sizeof(struct sockaddr_in6);
+static int port = 4974;
+
+static void setup_loopback_addr(int family, struct sockaddr_storage *sockaddr)
+{
+       struct sockaddr_in6 *addr6 = (void *) sockaddr;
+       struct sockaddr_in *addr4 = (void *) sockaddr;
+
+       switch (family) {
+       case PF_INET:
+               memset(addr4, 0, sizeof(*addr4));
+               addr4->sin_family = AF_INET;
+               addr4->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+               addr4->sin_port = htons(port);
+               break;
+       case PF_INET6:
+               memset(addr6, 0, sizeof(*addr6));
+               addr6->sin6_family = AF_INET6;
+               addr6->sin6_addr = in6addr_loopback;
+               addr6->sin6_port = htons(port);
+               break;
+       default:
+               error(1, 0, "illegal family");
+       }
+}
+
+void *start_server(void *arg)
+{
+       int server_fd = (int)(unsigned long)arg;
+       struct sockaddr_in addr;
+       socklen_t addrlen = sizeof(addr);
+       char *buf;
+       int fd;
+       int r;
+
+       buf = malloc(BUF_SIZE);
+
+       for (;;) {
+               fd = accept(server_fd, (struct sockaddr *)&addr, &addrlen);
+               if (fd == -1) {
+                       perror("accept");
+                       break;
+               }
+               do {
+                       r = send(fd, buf, BUF_SIZE, 0);
+               } while (r < 0 && errno == EINTR);
+               if (r < 0)
+                       perror("send");
+               if (r != BUF_SIZE)
+                       fprintf(stderr, "can only send %d bytes\n", r);
+               /* TCP_INQ can overestimate in-queue by one byte if we send
+                * the FIN packet. Sleep for 1 second, so that the client
+                * likely invoked recvmsg().
+                */
+               sleep(1);
+               close(fd);
+       }
+
+       free(buf);
+       close(server_fd);
+       pthread_exit(0);
+}
+
+int main(int argc, char *argv[])
+{
+       struct sockaddr_storage listen_addr, addr;
+       int c, one = 1, inq = -1;
+       pthread_t server_thread;
+       char cmsgbuf[CMSG_SIZE];
+       struct iovec iov[1];
+       struct cmsghdr *cm;
+       struct msghdr msg;
+       int server_fd, fd;
+       char *buf;
+
+       while ((c = getopt(argc, argv, "46p:")) != -1) {
+               switch (c) {
+               case '4':
+                       family = PF_INET;
+                       addr_len = sizeof(struct sockaddr_in);
+                       break;
+               case '6':
+                       family = PF_INET6;
+                       addr_len = sizeof(struct sockaddr_in6);
+                       break;
+               case 'p':
+                       port = atoi(optarg);
+                       break;
+               }
+       }
+
+       server_fd = socket(family, SOCK_STREAM, 0);
+       if (server_fd < 0)
+               error(1, errno, "server socket");
+       setup_loopback_addr(family, &listen_addr);
+       if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR,
+                      &one, sizeof(one)) != 0)
+               error(1, errno, "setsockopt(SO_REUSEADDR)");
+       if (bind(server_fd, (const struct sockaddr *)&listen_addr,
+                addr_len) == -1)
+               error(1, errno, "bind");
+       if (listen(server_fd, 128) == -1)
+               error(1, errno, "listen");
+       if (pthread_create(&server_thread, NULL, start_server,
+                          (void *)(unsigned long)server_fd) != 0)
+               error(1, errno, "pthread_create");
+
+       fd = socket(family, SOCK_STREAM, 0);
+       if (fd < 0)
+               error(1, errno, "client socket");
+       setup_loopback_addr(family, &addr);
+       if (connect(fd, (const struct sockaddr *)&addr, addr_len) == -1)
+               error(1, errno, "connect");
+       if (setsockopt(fd, SOL_TCP, TCP_INQ, &one, sizeof(one)) != 0)
+               error(1, errno, "setsockopt(TCP_INQ)");
+
+       msg.msg_name = NULL;
+       msg.msg_namelen = 0;
+       msg.msg_iov = iov;
+       msg.msg_iovlen = 1;
+       msg.msg_control = cmsgbuf;
+       msg.msg_controllen = sizeof(cmsgbuf);
+       msg.msg_flags = 0;
+
+       buf = malloc(BUF_SIZE);
+       iov[0].iov_base = buf;
+       iov[0].iov_len = BUF_SIZE / 2;
+
+       if (recvmsg(fd, &msg, 0) != iov[0].iov_len)
+               error(1, errno, "recvmsg");
+       if (msg.msg_flags & MSG_CTRUNC)
+               error(1, 0, "control message is truncated");
+
+       for (cm = CMSG_FIRSTHDR(&msg); cm; cm = CMSG_NXTHDR(&msg, cm))
+               if (cm->cmsg_level == SOL_TCP && cm->cmsg_type == TCP_CM_INQ)
+                       inq = *((int *) CMSG_DATA(cm));
+
+       if (inq != BUF_SIZE - iov[0].iov_len) {
+               fprintf(stderr, "unexpected inq: %d\n", inq);
+               exit(1);
+       }
+
+       printf("PASSED\n");
+       free(buf);
+       close(fd);
+       return 0;
+}