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Signed-off-by: Soheil Hassas Yeganeh <[email protected]> Signed-off-by: Yuchung Cheng <[email protected]> Signed-off-by: Willem de Bruijn <[email protected]> Reviewed-by: Eric Dumazet <[email protected]> Reviewed-by: Neal Cardwell <[email protected]> Signed-off-by: David S. Miller <[email protected]>
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/* | ||
* Copyright 2018 Google Inc. | ||
* Author: Soheil Hassas Yeganeh ([email protected]) | ||
* | ||
* 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 | ||
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#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> | ||
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#ifndef TCP_INQ | ||
#define TCP_INQ 36 | ||
#endif | ||
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#ifndef TCP_CM_INQ | ||
#define TCP_CM_INQ TCP_INQ | ||
#endif | ||
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#define BUF_SIZE 8192 | ||
#define CMSG_SIZE 32 | ||
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static int family = AF_INET6; | ||
static socklen_t addr_len = sizeof(struct sockaddr_in6); | ||
static int port = 4974; | ||
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static void setup_loopback_addr(int family, struct sockaddr_storage *sockaddr) | ||
{ | ||
struct sockaddr_in6 *addr6 = (void *) sockaddr; | ||
struct sockaddr_in *addr4 = (void *) sockaddr; | ||
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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"); | ||
} | ||
} | ||
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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; | ||
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buf = malloc(BUF_SIZE); | ||
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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); | ||
} | ||
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free(buf); | ||
close(server_fd); | ||
pthread_exit(0); | ||
} | ||
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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; | ||
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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; | ||
} | ||
} | ||
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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"); | ||
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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)"); | ||
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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; | ||
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buf = malloc(BUF_SIZE); | ||
iov[0].iov_base = buf; | ||
iov[0].iov_len = BUF_SIZE / 2; | ||
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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"); | ||
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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)); | ||
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if (inq != BUF_SIZE - iov[0].iov_len) { | ||
fprintf(stderr, "unexpected inq: %d\n", inq); | ||
exit(1); | ||
} | ||
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printf("PASSED\n"); | ||
free(buf); | ||
close(fd); | ||
return 0; | ||
} |