/*
- * Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <sys/ioctl.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
+#include <sys/uio.h>
#include <sys/un.h>
#include <unistd.h>
#include "dynamic-string.h"
#include "fatal-signal.h"
#include "packets.h"
+#include "poll-loop.h"
#include "util.h"
#include "vlog.h"
-#if AF_PACKET && __linux__
+#if AF_PACKET && LINUX_DATAPATH
#include <linux/if_packet.h>
#endif
#ifdef HAVE_NETLINK
/* #ifdefs make it a pain to maintain code: you have to try to build both ways.
* Thus, this file compiles all of the code regardless of the target, by
- * writing "if (LINUX)" instead of "#ifdef __linux__". */
-#ifdef __linux__
-#define LINUX 1
-#else
-#define LINUX 0
+ * writing "if (LINUX_DATAPATH)" instead of "#ifdef __linux__". */
+#ifndef LINUX_DATAPATH
+#define LINUX_DATAPATH 0
#endif
#ifndef O_DIRECTORY
#define O_DIRECTORY 0
#endif
+/* Maximum length of the sun_path member in a struct sockaddr_un, excluding
+ * space for a null terminator. */
+#define MAX_UN_LEN (sizeof(((struct sockaddr_un *) 0)->sun_path) - 1)
+
+static int getsockopt_int(int fd, int level, int option, const char *optname,
+ int *valuep);
+
/* Sets 'fd' to non-blocking mode. Returns 0 if successful, otherwise a
* positive errno value. */
int
if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) != -1) {
return 0;
} else {
- VLOG_ERR("fcntl(F_SETFL) failed: %s", strerror(errno));
+ VLOG_ERR("fcntl(F_SETFL) failed: %s", ovs_strerror(errno));
return errno;
}
} else {
- VLOG_ERR("fcntl(F_GETFL) failed: %s", strerror(errno));
+ VLOG_ERR("fcntl(F_GETFL) failed: %s", ovs_strerror(errno));
+ return errno;
+ }
+}
+
+void
+xset_nonblocking(int fd)
+{
+ if (set_nonblocking(fd)) {
+ exit(EXIT_FAILURE);
+ }
+}
+
+int
+set_dscp(int fd, uint8_t dscp)
+{
+ int val;
+
+ if (dscp > 63) {
+ return EINVAL;
+ }
+
+ val = dscp << 2;
+ if (setsockopt(fd, IPPROTO_IP, IP_TOS, &val, sizeof val)) {
return errno;
}
+
+ return 0;
}
static bool
int
get_max_fds(void)
{
- static int max_fds = -1;
- if (max_fds < 0) {
+ static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
+ static int max_fds;
+
+ if (ovsthread_once_start(&once)) {
struct rlimit r;
if (!getrlimit(RLIMIT_NOFILE, &r) && rlim_is_finite(r.rlim_cur)) {
max_fds = r.rlim_cur;
VLOG_WARN("failed to obtain fd limit, defaulting to 1024");
max_fds = 1024;
}
+ ovsthread_once_done(&once);
}
+
return max_fds;
}
* successful, otherwise a positive errno value.
*
* Most Open vSwitch code should not use this because it causes deadlocks:
- * gethostbyname() sends out a DNS request but that starts a new flow for which
+ * getaddrinfo() sends out a DNS request but that starts a new flow for which
* OVS must set up a flow, but it can't because it's waiting for a DNS reply.
- * The synchronous lookup also delays other activty. (Of course we can solve
+ * The synchronous lookup also delays other activity. (Of course we can solve
* this but it doesn't seem worthwhile quite yet.) */
int
lookup_hostname(const char *host_name, struct in_addr *addr)
{
- struct hostent *h;
+ struct addrinfo *result;
+ struct addrinfo hints;
if (inet_aton(host_name, addr)) {
return 0;
}
- h = gethostbyname(host_name);
- if (h) {
- *addr = *(struct in_addr *) h->h_addr;
+ memset(&hints, 0, sizeof hints);
+ hints.ai_family = AF_INET;
+
+ switch (getaddrinfo(host_name, NULL, &hints, &result)) {
+ case 0:
+ *addr = ALIGNED_CAST(struct sockaddr_in *,
+ result->ai_addr)->sin_addr;
+ freeaddrinfo(result);
return 0;
- }
- return (h_errno == HOST_NOT_FOUND ? ENOENT
- : h_errno == TRY_AGAIN ? EAGAIN
- : h_errno == NO_RECOVERY ? EIO
- : h_errno == NO_ADDRESS ? ENXIO
- : EINVAL);
-}
+#ifdef EAI_ADDRFAMILY
+ case EAI_ADDRFAMILY:
+#endif
+ case EAI_NONAME:
+ case EAI_SERVICE:
+ return ENOENT;
-/* Returns the error condition associated with socket 'fd' and resets the
- * socket's error status. */
-int
-get_socket_error(int fd)
-{
- int error;
- socklen_t len = sizeof(error);
- if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
- static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
- error = errno;
- VLOG_ERR_RL(&rl, "getsockopt(SO_ERROR): %s", strerror(error));
+ case EAI_AGAIN:
+ return EAGAIN;
+
+ case EAI_BADFLAGS:
+ case EAI_FAMILY:
+ case EAI_SOCKTYPE:
+ return EINVAL;
+
+ case EAI_FAIL:
+ return EIO;
+
+ case EAI_MEMORY:
+ return ENOMEM;
+
+#ifdef EAI_NODATA
+ case EAI_NODATA:
+ return ENXIO;
+#endif
+
+ case EAI_SYSTEM:
+ return errno;
+
+ default:
+ return EPROTO;
}
- return error;
}
int
check_connection_completion(int fd)
{
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
struct pollfd pfd;
int retval;
retval = poll(&pfd, 1, 0);
} while (retval < 0 && errno == EINTR);
if (retval == 1) {
- return get_socket_error(fd);
+ if (pfd.revents & POLLERR) {
+ ssize_t n = send(fd, "", 1, MSG_DONTWAIT);
+ if (n < 0) {
+ return errno;
+ } else {
+ VLOG_ERR_RL(&rl, "poll return POLLERR but send succeeded");
+ return EPROTO;
+ }
+ }
+ return 0;
} else if (retval < 0) {
- static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
- VLOG_ERR_RL(&rl, "poll: %s", strerror(errno));
+ VLOG_ERR_RL(&rl, "poll: %s", ovs_strerror(errno));
return errno;
} else {
return EAGAIN;
int
drain_rcvbuf(int fd)
{
- socklen_t rcvbuf_len;
- size_t rcvbuf;
+ int rcvbuf;
- rcvbuf_len = sizeof rcvbuf;
- if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, &rcvbuf_len) < 0) {
- static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
- VLOG_ERR_RL(&rl, "getsockopt(SO_RCVBUF) failed: %s", strerror(errno));
- return errno;
+ rcvbuf = get_socket_rcvbuf(fd);
+ if (rcvbuf < 0) {
+ return -rcvbuf;
}
+
while (rcvbuf > 0) {
/* In Linux, specifying MSG_TRUNC in the flags argument causes the
* datagram length to be returned, even if that is longer than the
*
* On other Unix-like OSes, MSG_TRUNC has no effect in the flags
* argument. */
- char buffer[LINUX ? 1 : 2048];
+ char buffer[LINUX_DATAPATH ? 1 : 2048];
ssize_t n_bytes = recv(fd, buffer, sizeof buffer,
MSG_TRUNC | MSG_DONTWAIT);
if (n_bytes <= 0 || n_bytes >= rcvbuf) {
return 0;
}
+/* Returns the size of socket 'sock''s receive buffer (SO_RCVBUF), or a
+ * negative errno value if an error occurs. */
+int
+get_socket_rcvbuf(int sock)
+{
+ int rcvbuf;
+ int error;
+
+ error = getsockopt_int(sock, SOL_SOCKET, SO_RCVBUF, "SO_RCVBUF", &rcvbuf);
+ return error ? -error : rcvbuf;
+}
+
/* Reads and discards up to 'n' datagrams from 'fd', stopping as soon as no
* more data can be immediately read. ('fd' should therefore be in
* non-blocking mode.)*/
}
}
-/* Stores in '*un' a sockaddr_un that refers to file 'name'. Stores in
- * '*un_len' the size of the sockaddr_un. */
-static void
-make_sockaddr_un__(const char *name, struct sockaddr_un *un, socklen_t *un_len)
+/* Attempts to shorten 'name' by opening a file descriptor for the directory
+ * part of the name and indirecting through /proc/self/fd/<dirfd>/<basename>.
+ * On systems with Linux-like /proc, this works as long as <basename> isn't too
+ * long.
+ *
+ * On success, returns 0 and stores the short name in 'short_name' and a
+ * directory file descriptor to eventually be closed in '*dirfpd'. */
+static int
+shorten_name_via_proc(const char *name, char short_name[MAX_UN_LEN + 1],
+ int *dirfdp)
{
- un->sun_family = AF_UNIX;
- ovs_strzcpy(un->sun_path, name, sizeof un->sun_path);
- *un_len = (offsetof(struct sockaddr_un, sun_path)
- + strlen (un->sun_path) + 1);
+ char *dir, *base;
+ int dirfd;
+ int len;
+
+ if (!LINUX_DATAPATH) {
+ return ENAMETOOLONG;
+ }
+
+ dir = dir_name(name);
+ dirfd = open(dir, O_DIRECTORY | O_RDONLY);
+ if (dirfd < 0) {
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
+ int error = errno;
+
+ VLOG_WARN_RL(&rl, "%s: open failed (%s)", dir, ovs_strerror(error));
+ free(dir);
+
+ return error;
+ }
+ free(dir);
+
+ base = base_name(name);
+ len = snprintf(short_name, MAX_UN_LEN + 1,
+ "/proc/self/fd/%d/%s", dirfd, base);
+ free(base);
+
+ if (len >= 0 && len <= MAX_UN_LEN) {
+ *dirfdp = dirfd;
+ return 0;
+ } else {
+ close(dirfd);
+ return ENAMETOOLONG;
+ }
+}
+
+/* Attempts to shorten 'name' by creating a symlink for the directory part of
+ * the name and indirecting through <symlink>/<basename>. This works on
+ * systems that support symlinks, as long as <basename> isn't too long.
+ *
+ * On success, returns 0 and stores the short name in 'short_name' and the
+ * symbolic link to eventually delete in 'linkname'. */
+static int
+shorten_name_via_symlink(const char *name, char short_name[MAX_UN_LEN + 1],
+ char linkname[MAX_UN_LEN + 1])
+{
+ char *abs, *dir, *base;
+ const char *tmpdir;
+ int error;
+ int i;
+
+ abs = abs_file_name(NULL, name);
+ dir = dir_name(abs);
+ base = base_name(abs);
+ free(abs);
+
+ tmpdir = getenv("TMPDIR");
+ if (tmpdir == NULL) {
+ tmpdir = "/tmp";
+ }
+
+ for (i = 0; i < 1000; i++) {
+ int len;
+
+ len = snprintf(linkname, MAX_UN_LEN + 1,
+ "%s/ovs-un-c-%"PRIu32, tmpdir, random_uint32());
+ error = (len < 0 || len > MAX_UN_LEN ? ENAMETOOLONG
+ : symlink(dir, linkname) ? errno
+ : 0);
+ if (error != EEXIST) {
+ break;
+ }
+ }
+
+ if (!error) {
+ int len;
+
+ fatal_signal_add_file_to_unlink(linkname);
+
+ len = snprintf(short_name, MAX_UN_LEN + 1, "%s/%s", linkname, base);
+ if (len < 0 || len > MAX_UN_LEN) {
+ fatal_signal_unlink_file_now(linkname);
+ error = ENAMETOOLONG;
+ }
+ }
+
+ if (error) {
+ linkname[0] = '\0';
+ }
+ free(dir);
+ free(base);
+
+ return error;
}
/* Stores in '*un' a sockaddr_un that refers to file 'name'. Stores in
* '*un_len' the size of the sockaddr_un.
*
- * Returns 0 on success, otherwise a positive errno value. On success,
- * '*dirfdp' is either -1 or a nonnegative file descriptor that the caller
- * should close after using '*un' to bind or connect. On failure, '*dirfdp' is
- * -1. */
+ * Returns 0 on success, otherwise a positive errno value.
+ *
+ * Uses '*dirfdp' and 'linkname' to store references to data when the caller no
+ * longer needs to use 'un'. On success, freeing these references with
+ * free_sockaddr_un() is mandatory to avoid a leak; on failure, freeing them is
+ * unnecessary but harmless. */
static int
make_sockaddr_un(const char *name, struct sockaddr_un *un, socklen_t *un_len,
- int *dirfdp)
+ int *dirfdp, char linkname[MAX_UN_LEN + 1])
{
- enum { MAX_UN_LEN = sizeof un->sun_path - 1 };
+ char short_name[MAX_UN_LEN + 1];
*dirfdp = -1;
+ linkname[0] = '\0';
if (strlen(name) > MAX_UN_LEN) {
- static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
-
- if (LINUX) {
- /* 'name' is too long to fit in a sockaddr_un, but we have a
- * workaround for that on Linux: shorten it by opening a file
- * descriptor for the directory part of the name and indirecting
- * through /proc/self/fd/<dirfd>/<basename>. */
- char *dir, *base;
- char *short_name;
- int dirfd;
-
- dir = dir_name(name);
- base = base_name(name);
-
- dirfd = open(dir, O_DIRECTORY | O_RDONLY);
- if (dirfd < 0) {
- free(base);
- free(dir);
- return errno;
- }
-
- short_name = xasprintf("/proc/self/fd/%d/%s", dirfd, base);
- free(dir);
- free(base);
-
- if (strlen(short_name) <= MAX_UN_LEN) {
- make_sockaddr_un__(short_name, un, un_len);
- free(short_name);
- *dirfdp = dirfd;
- return 0;
- }
- free(short_name);
- close(dirfd);
+ /* 'name' is too long to fit in a sockaddr_un. Try a workaround. */
+ int error = shorten_name_via_proc(name, short_name, dirfdp);
+ if (error == ENAMETOOLONG) {
+ error = shorten_name_via_symlink(name, short_name, linkname);
+ }
+ if (error) {
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
VLOG_WARN_RL(&rl, "Unix socket name %s is longer than maximum "
- "%d bytes (even shortened)", name, MAX_UN_LEN);
- } else {
- /* 'name' is too long and we have no workaround. */
- VLOG_WARN_RL(&rl, "Unix socket name %s is longer than maximum "
- "%d bytes", name, MAX_UN_LEN);
+ "%"PRIuSIZE" bytes", name, MAX_UN_LEN);
+ return error;
}
- return ENAMETOOLONG;
- } else {
- make_sockaddr_un__(name, un, un_len);
- return 0;
+ name = short_name;
+ }
+
+ un->sun_family = AF_UNIX;
+ ovs_strzcpy(un->sun_path, name, sizeof un->sun_path);
+ *un_len = (offsetof(struct sockaddr_un, sun_path)
+ + strlen (un->sun_path) + 1);
+ return 0;
+}
+
+/* Clean up after make_sockaddr_un(). */
+static void
+free_sockaddr_un(int dirfd, const char *linkname)
+{
+ if (dirfd >= 0) {
+ close(dirfd);
+ }
+ if (linkname[0]) {
+ fatal_signal_unlink_file_now(linkname);
}
}
/* Creates a Unix domain socket in the given 'style' (either SOCK_DGRAM or
* SOCK_STREAM) that is bound to '*bind_path' (if 'bind_path' is non-null) and
* connected to '*connect_path' (if 'connect_path' is non-null). If 'nonblock'
- * is true, the socket is made non-blocking. If 'passcred' is true, the socket
- * is configured to receive SCM_CREDENTIALS control messages.
+ * is true, the socket is made non-blocking.
*
* Returns the socket's fd if successful, otherwise a negative errno value. */
int
-make_unix_socket(int style, bool nonblock, bool passcred OVS_UNUSED,
+make_unix_socket(int style, bool nonblock,
const char *bind_path, const char *connect_path)
{
int error;
* it will only happen if style is SOCK_STREAM or SOCK_SEQPACKET, and only
* if a backlog of un-accepted connections has built up in the kernel.) */
if (nonblock) {
- int flags = fcntl(fd, F_GETFL, 0);
- if (flags == -1) {
- error = errno;
- goto error;
- }
- if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
- error = errno;
+ error = set_nonblocking(fd);
+ if (error) {
goto error;
}
}
if (bind_path) {
+ char linkname[MAX_UN_LEN + 1];
struct sockaddr_un un;
socklen_t un_len;
int dirfd;
if (unlink(bind_path) && errno != ENOENT) {
- VLOG_WARN("unlinking \"%s\": %s\n", bind_path, strerror(errno));
+ VLOG_WARN("unlinking \"%s\": %s\n",
+ bind_path, ovs_strerror(errno));
}
fatal_signal_add_file_to_unlink(bind_path);
- error = make_sockaddr_un(bind_path, &un, &un_len, &dirfd);
+ error = make_sockaddr_un(bind_path, &un, &un_len, &dirfd, linkname);
if (!error) {
error = bind_unix_socket(fd, (struct sockaddr *) &un, un_len);
}
- if (dirfd >= 0) {
- close(dirfd);
- }
+ free_sockaddr_un(dirfd, linkname);
+
if (error) {
goto error;
}
}
if (connect_path) {
+ char linkname[MAX_UN_LEN + 1];
struct sockaddr_un un;
socklen_t un_len;
int dirfd;
- error = make_sockaddr_un(connect_path, &un, &un_len, &dirfd);
+ error = make_sockaddr_un(connect_path, &un, &un_len, &dirfd, linkname);
if (!error
&& connect(fd, (struct sockaddr*) &un, un_len)
&& errno != EINPROGRESS) {
error = errno;
}
- if (dirfd >= 0) {
- close(dirfd);
- }
- if (error) {
- goto error;
- }
- }
+ free_sockaddr_un(dirfd, linkname);
-#ifdef SCM_CREDENTIALS
- if (passcred) {
- int enable = 1;
- if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &enable, sizeof(enable))) {
- error = errno;
+ if (error) {
goto error;
}
}
-#endif
return fd;
error = EPROTO;
}
if (bind_path) {
- fatal_signal_remove_file_to_unlink(bind_path);
+ fatal_signal_unlink_file_now(bind_path);
}
close(fd);
return -error;
* and stores -1 into '*fdp'.
*
* If 'sinp' is non-null, then on success the target address is stored into
- * '*sinp'. */
+ * '*sinp'.
+ *
+ * 'dscp' becomes the DSCP bits in the IP headers for the new connection. It
+ * should be in the range [0, 63] and will automatically be shifted to the
+ * appropriately place in the IP tos field. */
int
inet_open_active(int style, const char *target, uint16_t default_port,
- struct sockaddr_in *sinp, int *fdp)
+ struct sockaddr_in *sinp, int *fdp, uint8_t dscp)
{
struct sockaddr_in sin;
int fd = -1;
/* Create non-blocking socket. */
fd = socket(AF_INET, style, 0);
if (fd < 0) {
- VLOG_ERR("%s: socket: %s", target, strerror(errno));
+ VLOG_ERR("%s: socket: %s", target, ovs_strerror(errno));
error = errno;
goto exit;
}
error = set_nonblocking(fd);
if (error) {
- goto exit_close;
+ goto exit;
+ }
+
+ /* The dscp bits must be configured before connect() to ensure that the TOS
+ * field is set during the connection establishment. If set after
+ * connect(), the handshake SYN frames will be sent with a TOS of 0. */
+ error = set_dscp(fd, dscp);
+ if (error) {
+ VLOG_ERR("%s: socket: %s", target, ovs_strerror(error));
+ goto exit;
}
/* Connect. */
error = connect(fd, (struct sockaddr *) &sin, sizeof sin) == 0 ? 0 : errno;
if (error == EINPROGRESS) {
error = EAGAIN;
- } else if (error && error != EAGAIN) {
- goto exit_close;
}
- /* Success: error is 0 or EAGAIN. */
- goto exit;
-
-exit_close:
- close(fd);
exit:
if (!error || error == EAGAIN) {
if (sinp) {
*sinp = sin;
}
- *fdp = fd;
- } else {
- *fdp = -1;
+ } else if (fd >= 0) {
+ close(fd);
+ fd = -1;
}
+ *fdp = fd;
return error;
}
* If successful, stores the address into '*sinp' and returns true; otherwise
* zeros '*sinp' and returns false. */
bool
-inet_parse_passive(const char *target_, uint16_t default_port,
+inet_parse_passive(const char *target_, int default_port,
struct sockaddr_in *sinp)
{
char *target = xstrdup(target_);
* negative errno value.
*
* If 'sinp' is non-null, then on success the bound address is stored into
- * '*sinp'. */
+ * '*sinp'.
+ *
+ * 'dscp' becomes the DSCP bits in the IP headers for the new connection. It
+ * should be in the range [0, 63] and will automatically be shifted to the
+ * appropriately place in the IP tos field. */
int
inet_open_passive(int style, const char *target, int default_port,
- struct sockaddr_in *sinp)
+ struct sockaddr_in *sinp, uint8_t dscp)
{
+ bool kernel_chooses_port;
struct sockaddr_in sin;
int fd = 0, error;
unsigned int yes = 1;
if (!inet_parse_passive(target, default_port, &sin)) {
- return EAFNOSUPPORT;
+ return -EAFNOSUPPORT;
}
/* Create non-blocking socket, set SO_REUSEADDR. */
fd = socket(AF_INET, style, 0);
if (fd < 0) {
error = errno;
- VLOG_ERR("%s: socket: %s", target, strerror(error));
- return error;
+ VLOG_ERR("%s: socket: %s", target, ovs_strerror(error));
+ return -error;
}
error = set_nonblocking(fd);
if (error) {
if (style == SOCK_STREAM
&& setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof yes) < 0) {
error = errno;
- VLOG_ERR("%s: setsockopt(SO_REUSEADDR): %s", target, strerror(error));
+ VLOG_ERR("%s: setsockopt(SO_REUSEADDR): %s",
+ target, ovs_strerror(error));
goto error;
}
/* Bind. */
if (bind(fd, (struct sockaddr *) &sin, sizeof sin) < 0) {
error = errno;
- VLOG_ERR("%s: bind: %s", target, strerror(error));
+ VLOG_ERR("%s: bind: %s", target, ovs_strerror(error));
+ goto error;
+ }
+
+ /* The dscp bits must be configured before connect() to ensure that the TOS
+ * field is set during the connection establishment. If set after
+ * connect(), the handshake SYN frames will be sent with a TOS of 0. */
+ error = set_dscp(fd, dscp);
+ if (error) {
+ VLOG_ERR("%s: socket: %s", target, ovs_strerror(error));
goto error;
}
/* Listen. */
- if (listen(fd, 10) < 0) {
+ if (style == SOCK_STREAM && listen(fd, 10) < 0) {
error = errno;
- VLOG_ERR("%s: listen: %s", target, strerror(error));
+ VLOG_ERR("%s: listen: %s", target, ovs_strerror(error));
goto error;
}
- if (sinp) {
+ kernel_chooses_port = sin.sin_port == htons(0);
+ if (sinp || kernel_chooses_port) {
socklen_t sin_len = sizeof sin;
- if (getsockname(fd, (struct sockaddr *) &sin, &sin_len) < 0){
+ if (getsockname(fd, (struct sockaddr *) &sin, &sin_len) < 0) {
error = errno;
- VLOG_ERR("%s: getsockname: %s", target, strerror(error));
+ VLOG_ERR("%s: getsockname: %s", target, ovs_strerror(error));
goto error;
}
if (sin.sin_family != AF_INET || sin_len != sizeof sin) {
+ error = EAFNOSUPPORT;
VLOG_ERR("%s: getsockname: invalid socket name", target);
goto error;
}
- *sinp = sin;
+ if (sinp) {
+ *sinp = sin;
+ }
+ if (kernel_chooses_port) {
+ VLOG_INFO("%s: listening on port %"PRIu16,
+ target, ntohs(sin.sin_port));
+ }
}
return fd;
error:
close(fd);
- return error;
+ return -error;
}
/* Returns a readable and writable fd for /dev/null, if successful, otherwise
int
get_null_fd(void)
{
- static int null_fd = -1;
- if (null_fd < 0) {
+ static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
+ static int null_fd;
+
+ if (ovsthread_once_start(&once)) {
null_fd = open("/dev/null", O_RDWR);
if (null_fd < 0) {
int error = errno;
- VLOG_ERR("could not open /dev/null: %s", strerror(error));
- return -error;
+ VLOG_ERR("could not open /dev/null: %s", ovs_strerror(error));
+ null_fd = -error;
}
+ ovsthread_once_done(&once);
}
+
return null_fd;
}
* really an error. */
} else {
error = errno;
- VLOG_ERR("%s: fsync failed (%s)", dir, strerror(error));
+ VLOG_ERR("%s: fsync failed (%s)", dir, ovs_strerror(error));
}
}
close(fd);
} else {
error = errno;
- VLOG_ERR("%s: open failed (%s)", dir, strerror(error));
+ VLOG_ERR("%s: open failed (%s)", dir, ovs_strerror(error));
}
free(dir);
xpipe(int fds[2])
{
if (pipe(fds)) {
- VLOG_FATAL("failed to create pipe (%s)", strerror(errno));
+ VLOG_FATAL("failed to create pipe (%s)", ovs_strerror(errno));
+ }
+}
+
+void
+xpipe_nonblocking(int fds[2])
+{
+ xpipe(fds);
+ xset_nonblocking(fds[0]);
+ xset_nonblocking(fds[1]);
+}
+
+void
+xsocketpair(int domain, int type, int protocol, int fds[2])
+{
+ if (socketpair(domain, type, protocol, fds)) {
+ VLOG_FATAL("failed to create socketpair (%s)", ovs_strerror(errno));
}
}
static int
-getsockopt_int(int fd, int level, int optname, int *valuep)
+getsockopt_int(int fd, int level, int option, const char *optname, int *valuep)
{
- socklen_t len = sizeof *valuep;
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
+ socklen_t len;
+ int value;
+ int error;
- return (getsockopt(fd, level, optname, valuep, &len) ? errno
- : len == sizeof *valuep ? 0
- : EINVAL);
+ len = sizeof value;
+ if (getsockopt(fd, level, option, &value, &len)) {
+ error = errno;
+ VLOG_ERR_RL(&rl, "getsockopt(%s): %s", optname, ovs_strerror(error));
+ } else if (len != sizeof value) {
+ error = EINVAL;
+ VLOG_ERR_RL(&rl, "getsockopt(%s): value is %u bytes (expected %"PRIuSIZE")",
+ optname, (unsigned int) len, sizeof value);
+ } else {
+ error = 0;
+ }
+
+ *valuep = error ? 0 : value;
+ return error;
}
static void
memcpy(&sin, &ss, sizeof sin);
ds_put_format(string, IP_FMT":%"PRIu16,
- IP_ARGS(&sin.sin_addr.s_addr), ntohs(sin.sin_port));
+ IP_ARGS(sin.sin_addr.s_addr), ntohs(sin.sin_port));
} else if (ss.ss_family == AF_UNIX) {
struct sockaddr_un sun;
const char *null;
#define SO_PROTOCOL 38
#endif
- if (!getsockopt_int(fd, SOL_SOCKET, SO_PROTOCOL, &protocol)) {
+ if (!getsockopt_int(fd, SOL_SOCKET, SO_PROTOCOL, "SO_PROTOCOL",
+ &protocol)) {
switch (protocol) {
case NETLINK_ROUTE:
ds_put_cstr(string, "NETLINK_ROUTE");
}
}
#endif
-#if AF_PACKET && __linux__
+#if AF_PACKET && LINUX_DATAPATH
else if (ss.ss_family == AF_PACKET) {
struct sockaddr_ll sll;
}
-#ifdef __linux__
+#ifdef LINUX_DATAPATH
static void
put_fd_filename(struct ds *string, int fd)
{
ds_init(&string);
if (fstat(fd, &s)) {
- ds_put_format(&string, "fstat failed (%s)", strerror(errno));
+ ds_put_format(&string, "fstat failed (%s)", ovs_strerror(errno));
} else if (S_ISSOCK(s.st_mode)) {
describe_sockaddr(&string, fd, getsockname);
ds_put_cstr(&string, "<->");
: S_ISFIFO(s.st_mode) ? "FIFO"
: S_ISLNK(s.st_mode) ? "symbolic link"
: "unknown"));
-#ifdef __linux__
+#ifdef LINUX_DATAPATH
put_fd_filename(&string, fd);
#endif
}
return ds_steal_cstr(&string);
}
+
+/* Returns the total of the 'iov_len' members of the 'n_iovs' in 'iovs'.
+ * The caller must ensure that the total does not exceed SIZE_MAX. */
+size_t
+iovec_len(const struct iovec iovs[], size_t n_iovs)
+{
+ size_t len = 0;
+ size_t i;
+
+ for (i = 0; i < n_iovs; i++) {
+ len += iovs[i].iov_len;
+ }
+ return len;
+}
+
+/* Returns true if all of the 'n_iovs' iovecs in 'iovs' have length zero. */
+bool
+iovec_is_empty(const struct iovec iovs[], size_t n_iovs)
+{
+ size_t i;
+
+ for (i = 0; i < n_iovs; i++) {
+ if (iovs[i].iov_len) {
+ return false;
+ }
+ }
+ return true;
+}
+
+/* Sends the 'n_iovs' iovecs of data in 'iovs' and the 'n_fds' file descriptors
+ * in 'fds' on Unix domain socket 'sock'. Returns the number of bytes
+ * successfully sent or -1 if an error occurred. On error, sets errno
+ * appropriately. */
+int
+send_iovec_and_fds(int sock,
+ const struct iovec *iovs, size_t n_iovs,
+ const int fds[], size_t n_fds)
+{
+ ovs_assert(sock >= 0);
+ if (n_fds > 0) {
+ union {
+ struct cmsghdr cm;
+ char control[CMSG_SPACE(SOUTIL_MAX_FDS * sizeof *fds)];
+ } cmsg;
+ struct msghdr msg;
+
+ ovs_assert(!iovec_is_empty(iovs, n_iovs));
+ ovs_assert(n_fds <= SOUTIL_MAX_FDS);
+
+ memset(&cmsg, 0, sizeof cmsg);
+ cmsg.cm.cmsg_len = CMSG_LEN(n_fds * sizeof *fds);
+ cmsg.cm.cmsg_level = SOL_SOCKET;
+ cmsg.cm.cmsg_type = SCM_RIGHTS;
+ memcpy(CMSG_DATA(&cmsg.cm), fds, n_fds * sizeof *fds);
+
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ msg.msg_iov = CONST_CAST(struct iovec *, iovs);
+ msg.msg_iovlen = n_iovs;
+ msg.msg_control = &cmsg.cm;
+ msg.msg_controllen = CMSG_SPACE(n_fds * sizeof *fds);
+ msg.msg_flags = 0;
+
+ return sendmsg(sock, &msg, 0);
+ } else {
+ return writev(sock, iovs, n_iovs);
+ }
+}
+
+/* Sends the 'n_iovs' iovecs of data in 'iovs' and the 'n_fds' file descriptors
+ * in 'fds' on Unix domain socket 'sock'. If 'skip_bytes' is nonzero, then the
+ * first 'skip_bytes' of data in the iovecs are not sent, and none of the file
+ * descriptors are sent. The function continues to retry sending until an
+ * error (other than EINTR) occurs or all the data and fds are sent.
+ *
+ * Returns 0 if all the data and fds were successfully sent, otherwise a
+ * positive errno value. Regardless of success, stores the number of bytes
+ * sent (always at least 'skip_bytes') in '*bytes_sent'. (If at least one byte
+ * is sent, then all the fds have been sent.)
+ *
+ * 'skip_bytes' must be less than or equal to iovec_len(iovs, n_iovs). */
+int
+send_iovec_and_fds_fully(int sock,
+ const struct iovec iovs[], size_t n_iovs,
+ const int fds[], size_t n_fds,
+ size_t skip_bytes, size_t *bytes_sent)
+{
+ *bytes_sent = 0;
+ while (n_iovs > 0) {
+ int retval;
+
+ if (skip_bytes) {
+ retval = skip_bytes;
+ skip_bytes = 0;
+ } else if (!*bytes_sent) {
+ retval = send_iovec_and_fds(sock, iovs, n_iovs, fds, n_fds);
+ } else {
+ retval = writev(sock, iovs, n_iovs);
+ }
+
+ if (retval > 0) {
+ *bytes_sent += retval;
+ while (retval > 0) {
+ const uint8_t *base = iovs->iov_base;
+ size_t len = iovs->iov_len;
+
+ if (retval < len) {
+ size_t sent;
+ int error;
+
+ error = write_fully(sock, base + retval, len - retval,
+ &sent);
+ *bytes_sent += sent;
+ retval += sent;
+ if (error) {
+ return error;
+ }
+ }
+ retval -= len;
+ iovs++;
+ n_iovs--;
+ }
+ } else if (retval == 0) {
+ if (iovec_is_empty(iovs, n_iovs)) {
+ break;
+ }
+ VLOG_WARN("send returned 0");
+ return EPROTO;
+ } else if (errno != EINTR) {
+ return errno;
+ }
+ }
+
+ return 0;
+}
+
+/* Sends the 'n_iovs' iovecs of data in 'iovs' and the 'n_fds' file descriptors
+ * in 'fds' on Unix domain socket 'sock'. The function continues to retry
+ * sending until an error (other than EAGAIN or EINTR) occurs or all the data
+ * and fds are sent. Upon EAGAIN, the function blocks until the socket is
+ * ready for more data.
+ *
+ * Returns 0 if all the data and fds were successfully sent, otherwise a
+ * positive errno value. */
+int
+send_iovec_and_fds_fully_block(int sock,
+ const struct iovec iovs[], size_t n_iovs,
+ const int fds[], size_t n_fds)
+{
+ size_t sent = 0;
+
+ for (;;) {
+ int error;
+
+ error = send_iovec_and_fds_fully(sock, iovs, n_iovs,
+ fds, n_fds, sent, &sent);
+ if (error != EAGAIN) {
+ return error;
+ }
+ poll_fd_wait(sock, POLLOUT);
+ poll_block();
+ }
+}
+
+/* Attempts to receive from Unix domain socket 'sock' up to 'size' bytes of
+ * data into 'data' and up to SOUTIL_MAX_FDS file descriptors into 'fds'.
+ *
+ * - Upon success, returns the number of bytes of data copied into 'data'
+ * and stores the number of received file descriptors into '*n_fdsp'.
+ *
+ * - On failure, returns a negative errno value and stores 0 in
+ * '*n_fdsp'.
+ *
+ * - On EOF, returns 0 and stores 0 in '*n_fdsp'. */
+int
+recv_data_and_fds(int sock,
+ void *data, size_t size,
+ int fds[SOUTIL_MAX_FDS], size_t *n_fdsp)
+{
+ union {
+ struct cmsghdr cm;
+ char control[CMSG_SPACE(SOUTIL_MAX_FDS * sizeof *fds)];
+ } cmsg;
+ struct msghdr msg;
+ int retval;
+ struct cmsghdr *p;
+ size_t i;
+
+ *n_fdsp = 0;
+
+ do {
+ struct iovec iov;
+
+ iov.iov_base = data;
+ iov.iov_len = size;
+
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = &cmsg.cm;
+ msg.msg_controllen = sizeof cmsg.control;
+ msg.msg_flags = 0;
+
+ retval = recvmsg(sock, &msg, 0);
+ } while (retval < 0 && errno == EINTR);
+ if (retval <= 0) {
+ return retval < 0 ? -errno : 0;
+ }
+
+ for (p = CMSG_FIRSTHDR(&msg); p; p = CMSG_NXTHDR(&msg, p)) {
+ if (p->cmsg_level != SOL_SOCKET || p->cmsg_type != SCM_RIGHTS) {
+ VLOG_ERR("unexpected control message %d:%d",
+ p->cmsg_level, p->cmsg_type);
+ goto error;
+ } else if (*n_fdsp) {
+ VLOG_ERR("multiple SCM_RIGHTS received");
+ goto error;
+ } else {
+ size_t n_fds = (p->cmsg_len - CMSG_LEN(0)) / sizeof *fds;
+ const int *fds_data = ALIGNED_CAST(const int *, CMSG_DATA(p));
+
+ ovs_assert(n_fds > 0);
+ if (n_fds > SOUTIL_MAX_FDS) {
+ VLOG_ERR("%"PRIuSIZE" fds received but only %d supported",
+ n_fds, SOUTIL_MAX_FDS);
+ for (i = 0; i < n_fds; i++) {
+ close(fds_data[i]);
+ }
+ goto error;
+ }
+
+ *n_fdsp = n_fds;
+ memcpy(fds, fds_data, n_fds * sizeof *fds);
+ }
+ }
+
+ return retval;
+
+error:
+ for (i = 0; i < *n_fdsp; i++) {
+ close(fds[i]);
+ }
+ *n_fdsp = 0;
+ return EPROTO;
+}
+
+/* Calls ioctl() on an AF_INET sock, passing the specified 'command' and
+ * 'arg'. Returns 0 if successful, otherwise a positive errno value. */
+int
+af_inet_ioctl(unsigned long int command, const void *arg)
+{
+ static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
+ static int sock;
+
+ if (ovsthread_once_start(&once)) {
+ sock = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sock < 0) {
+ sock = -errno;
+ VLOG_ERR("failed to create inet socket: %s", ovs_strerror(errno));
+ }
+ ovsthread_once_done(&once);
+ }
+
+ return (sock < 0 ? -sock
+ : ioctl(sock, command, arg) == -1 ? errno
+ : 0);
+}
+
+int
+af_inet_ifreq_ioctl(const char *name, struct ifreq *ifr, unsigned long int cmd,
+ const char *cmd_name)
+{
+ int error;
+
+ ovs_strzcpy(ifr->ifr_name, name, sizeof ifr->ifr_name);
+ error = af_inet_ioctl(cmd, ifr);
+ if (error) {
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
+ VLOG_DBG_RL(&rl, "%s: ioctl(%s) failed: %s", name, cmd_name,
+ ovs_strerror(error));
+ }
+ return error;
+}
+
projects / cascardo / ovs.git / blobdiff