/usr/src/openvswitch-1.4.0/lib/stream.c is in openvswitch-datapath-dkms 1.4.0-1ubuntu1.
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* Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "stream-provider.h"
#include <assert.h>
#include <errno.h>
#include <inttypes.h>
#include <netinet/in.h>
#include <poll.h>
#include <stdlib.h>
#include <string.h>
#include "coverage.h"
#include "dynamic-string.h"
#include "fatal-signal.h"
#include "flow.h"
#include "ofp-print.h"
#include "ofpbuf.h"
#include "openflow/nicira-ext.h"
#include "openflow/openflow.h"
#include "packets.h"
#include "poll-loop.h"
#include "random.h"
#include "util.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(stream);
COVERAGE_DEFINE(pstream_open);
COVERAGE_DEFINE(stream_open);
/* State of an active stream.*/
enum stream_state {
SCS_CONNECTING, /* Underlying stream is not connected. */
SCS_CONNECTED, /* Connection established. */
SCS_DISCONNECTED /* Connection failed or connection closed. */
};
static const struct stream_class *stream_classes[] = {
&tcp_stream_class,
&unix_stream_class,
#ifdef HAVE_OPENSSL
&ssl_stream_class,
#endif
};
static const struct pstream_class *pstream_classes[] = {
&ptcp_pstream_class,
&punix_pstream_class,
#ifdef HAVE_OPENSSL
&pssl_pstream_class,
#endif
};
/* Check the validity of the stream class structures. */
static void
check_stream_classes(void)
{
#ifndef NDEBUG
size_t i;
for (i = 0; i < ARRAY_SIZE(stream_classes); i++) {
const struct stream_class *class = stream_classes[i];
assert(class->name != NULL);
assert(class->open != NULL);
if (class->close || class->recv || class->send || class->run
|| class->run_wait || class->wait) {
assert(class->close != NULL);
assert(class->recv != NULL);
assert(class->send != NULL);
assert(class->wait != NULL);
} else {
/* This class delegates to another one. */
}
}
for (i = 0; i < ARRAY_SIZE(pstream_classes); i++) {
const struct pstream_class *class = pstream_classes[i];
assert(class->name != NULL);
assert(class->listen != NULL);
if (class->close || class->accept || class->wait) {
assert(class->close != NULL);
assert(class->accept != NULL);
assert(class->wait != NULL);
} else {
/* This class delegates to another one. */
}
}
#endif
}
/* Prints information on active (if 'active') and passive (if 'passive')
* connection methods supported by the stream. */
void
stream_usage(const char *name, bool active, bool passive,
bool bootstrap OVS_UNUSED)
{
/* Really this should be implemented via callbacks into the stream
* providers, but that seems too heavy-weight to bother with at the
* moment. */
printf("\n");
if (active) {
printf("Active %s connection methods:\n", name);
printf(" tcp:IP:PORT "
"PORT at remote IP\n");
#ifdef HAVE_OPENSSL
printf(" ssl:IP:PORT "
"SSL PORT at remote IP\n");
#endif
printf(" unix:FILE "
"Unix domain socket named FILE\n");
}
if (passive) {
printf("Passive %s connection methods:\n", name);
printf(" ptcp:PORT[:IP] "
"listen to TCP PORT on IP\n");
#ifdef HAVE_OPENSSL
printf(" pssl:PORT[:IP] "
"listen for SSL on PORT on IP\n");
#endif
printf(" punix:FILE "
"listen on Unix domain socket FILE\n");
}
#ifdef HAVE_OPENSSL
printf("PKI configuration (required to use SSL):\n"
" -p, --private-key=FILE file with private key\n"
" -c, --certificate=FILE file with certificate for private key\n"
" -C, --ca-cert=FILE file with peer CA certificate\n");
if (bootstrap) {
printf(" --bootstrap-ca-cert=FILE file with peer CA certificate "
"to read or create\n");
}
#endif
}
/* Given 'name', a stream name in the form "TYPE:ARGS", stores the class
* named "TYPE" into '*classp' and returns 0. Returns EAFNOSUPPORT and stores
* a null pointer into '*classp' if 'name' is in the wrong form or if no such
* class exists. */
static int
stream_lookup_class(const char *name, const struct stream_class **classp)
{
size_t prefix_len;
size_t i;
check_stream_classes();
*classp = NULL;
prefix_len = strcspn(name, ":");
if (name[prefix_len] == '\0') {
return EAFNOSUPPORT;
}
for (i = 0; i < ARRAY_SIZE(stream_classes); i++) {
const struct stream_class *class = stream_classes[i];
if (strlen(class->name) == prefix_len
&& !memcmp(class->name, name, prefix_len)) {
*classp = class;
return 0;
}
}
return EAFNOSUPPORT;
}
/* Returns 0 if 'name' is a stream name in the form "TYPE:ARGS" and TYPE is
* a supported stream type, otherwise EAFNOSUPPORT. */
int
stream_verify_name(const char *name)
{
const struct stream_class *class;
return stream_lookup_class(name, &class);
}
/* Attempts to connect a stream to a remote peer. 'name' is a connection name
* in the form "TYPE:ARGS", where TYPE is an active stream class's name and
* ARGS are stream class-specific.
*
* Returns 0 if successful, otherwise a positive errno value. If successful,
* stores a pointer to the new connection in '*streamp', otherwise a null
* pointer. */
int
stream_open(const char *name, struct stream **streamp)
{
const struct stream_class *class;
struct stream *stream;
char *suffix_copy;
int error;
COVERAGE_INC(stream_open);
/* Look up the class. */
error = stream_lookup_class(name, &class);
if (!class) {
goto error;
}
/* Call class's "open" function. */
suffix_copy = xstrdup(strchr(name, ':') + 1);
error = class->open(name, suffix_copy, &stream);
free(suffix_copy);
if (error) {
goto error;
}
/* Success. */
*streamp = stream;
return 0;
error:
*streamp = NULL;
return error;
}
/* Blocks until a previously started stream connection attempt succeeds or
* fails. 'error' should be the value returned by stream_open() and 'streamp'
* should point to the stream pointer set by stream_open(). Returns 0 if
* successful, otherwise a positive errno value other than EAGAIN or
* EINPROGRESS. If successful, leaves '*streamp' untouched; on error, closes
* '*streamp' and sets '*streamp' to null.
*
* Typical usage:
* error = stream_open_block(stream_open("tcp:1.2.3.4:5", &stream), &stream);
*/
int
stream_open_block(int error, struct stream **streamp)
{
struct stream *stream = *streamp;
fatal_signal_run();
if (!error) {
while ((error = stream_connect(stream)) == EAGAIN) {
stream_run(stream);
stream_run_wait(stream);
stream_connect_wait(stream);
poll_block();
}
assert(error != EINPROGRESS);
}
if (error) {
stream_close(stream);
*streamp = NULL;
} else {
*streamp = stream;
}
return error;
}
/* Closes 'stream'. */
void
stream_close(struct stream *stream)
{
if (stream != NULL) {
char *name = stream->name;
(stream->class->close)(stream);
free(name);
}
}
/* Returns the name of 'stream', that is, the string passed to
* stream_open(). */
const char *
stream_get_name(const struct stream *stream)
{
return stream ? stream->name : "(null)";
}
/* Returns the IP address of the peer, or 0 if the peer is not connected over
* an IP-based protocol or if its IP address is not yet known. */
ovs_be32
stream_get_remote_ip(const struct stream *stream)
{
return stream->remote_ip;
}
/* Returns the transport port of the peer, or 0 if the connection does not
* contain a port or if the port is not yet known. */
ovs_be16
stream_get_remote_port(const struct stream *stream)
{
return stream->remote_port;
}
/* Returns the IP address used to connect to the peer, or 0 if the connection
* is not an IP-based protocol or if its IP address is not yet known. */
ovs_be32
stream_get_local_ip(const struct stream *stream)
{
return stream->local_ip;
}
/* Returns the transport port used to connect to the peer, or 0 if the
* connection does not contain a port or if the port is not yet known. */
ovs_be16
stream_get_local_port(const struct stream *stream)
{
return stream->local_port;
}
static void
scs_connecting(struct stream *stream)
{
int retval = (stream->class->connect)(stream);
assert(retval != EINPROGRESS);
if (!retval) {
stream->state = SCS_CONNECTED;
} else if (retval != EAGAIN) {
stream->state = SCS_DISCONNECTED;
stream->error = retval;
}
}
/* Tries to complete the connection on 'stream'. If 'stream''s connection is
* complete, returns 0 if the connection was successful or a positive errno
* value if it failed. If the connection is still in progress, returns
* EAGAIN. */
int
stream_connect(struct stream *stream)
{
enum stream_state last_state;
do {
last_state = stream->state;
switch (stream->state) {
case SCS_CONNECTING:
scs_connecting(stream);
break;
case SCS_CONNECTED:
return 0;
case SCS_DISCONNECTED:
return stream->error;
default:
NOT_REACHED();
}
} while (stream->state != last_state);
return EAGAIN;
}
/* Tries to receive up to 'n' bytes from 'stream' into 'buffer', and returns:
*
* - If successful, the number of bytes received (between 1 and 'n').
*
* - On error, a negative errno value.
*
* - 0, if the connection has been closed in the normal fashion, or if 'n'
* is zero.
*
* The recv function will not block waiting for a packet to arrive. If no
* data have been received, it returns -EAGAIN immediately. */
int
stream_recv(struct stream *stream, void *buffer, size_t n)
{
int retval = stream_connect(stream);
return (retval ? -retval
: n == 0 ? 0
: (stream->class->recv)(stream, buffer, n));
}
/* Tries to send up to 'n' bytes of 'buffer' on 'stream', and returns:
*
* - If successful, the number of bytes sent (between 1 and 'n'). 0 is
* only a valid return value if 'n' is 0.
*
* - On error, a negative errno value.
*
* The send function will not block. If no bytes can be immediately accepted
* for transmission, it returns -EAGAIN immediately. */
int
stream_send(struct stream *stream, const void *buffer, size_t n)
{
int retval = stream_connect(stream);
return (retval ? -retval
: n == 0 ? 0
: (stream->class->send)(stream, buffer, n));
}
/* Allows 'stream' to perform maintenance activities, such as flushing
* output buffers. */
void
stream_run(struct stream *stream)
{
if (stream->class->run) {
(stream->class->run)(stream);
}
}
/* Arranges for the poll loop to wake up when 'stream' needs to perform
* maintenance activities. */
void
stream_run_wait(struct stream *stream)
{
if (stream->class->run_wait) {
(stream->class->run_wait)(stream);
}
}
/* Arranges for the poll loop to wake up when 'stream' is ready to take an
* action of the given 'type'. */
void
stream_wait(struct stream *stream, enum stream_wait_type wait)
{
assert(wait == STREAM_CONNECT || wait == STREAM_RECV
|| wait == STREAM_SEND);
switch (stream->state) {
case SCS_CONNECTING:
wait = STREAM_CONNECT;
break;
case SCS_DISCONNECTED:
poll_immediate_wake();
return;
}
(stream->class->wait)(stream, wait);
}
void
stream_connect_wait(struct stream *stream)
{
stream_wait(stream, STREAM_CONNECT);
}
void
stream_recv_wait(struct stream *stream)
{
stream_wait(stream, STREAM_RECV);
}
void
stream_send_wait(struct stream *stream)
{
stream_wait(stream, STREAM_SEND);
}
/* Given 'name', a pstream name in the form "TYPE:ARGS", stores the class
* named "TYPE" into '*classp' and returns 0. Returns EAFNOSUPPORT and stores
* a null pointer into '*classp' if 'name' is in the wrong form or if no such
* class exists. */
static int
pstream_lookup_class(const char *name, const struct pstream_class **classp)
{
size_t prefix_len;
size_t i;
check_stream_classes();
*classp = NULL;
prefix_len = strcspn(name, ":");
if (name[prefix_len] == '\0') {
return EAFNOSUPPORT;
}
for (i = 0; i < ARRAY_SIZE(pstream_classes); i++) {
const struct pstream_class *class = pstream_classes[i];
if (strlen(class->name) == prefix_len
&& !memcmp(class->name, name, prefix_len)) {
*classp = class;
return 0;
}
}
return EAFNOSUPPORT;
}
/* Returns 0 if 'name' is a pstream name in the form "TYPE:ARGS" and TYPE is
* a supported pstream type, otherwise EAFNOSUPPORT. */
int
pstream_verify_name(const char *name)
{
const struct pstream_class *class;
return pstream_lookup_class(name, &class);
}
/* Attempts to start listening for remote stream connections. 'name' is a
* connection name in the form "TYPE:ARGS", where TYPE is an passive stream
* class's name and ARGS are stream class-specific.
*
* Returns 0 if successful, otherwise a positive errno value. If successful,
* stores a pointer to the new connection in '*pstreamp', otherwise a null
* pointer. */
int
pstream_open(const char *name, struct pstream **pstreamp)
{
const struct pstream_class *class;
struct pstream *pstream;
char *suffix_copy;
int error;
COVERAGE_INC(pstream_open);
/* Look up the class. */
error = pstream_lookup_class(name, &class);
if (!class) {
goto error;
}
/* Call class's "open" function. */
suffix_copy = xstrdup(strchr(name, ':') + 1);
error = class->listen(name, suffix_copy, &pstream);
free(suffix_copy);
if (error) {
goto error;
}
/* Success. */
*pstreamp = pstream;
return 0;
error:
*pstreamp = NULL;
return error;
}
/* Returns the name that was used to open 'pstream'. The caller must not
* modify or free the name. */
const char *
pstream_get_name(const struct pstream *pstream)
{
return pstream->name;
}
/* Closes 'pstream'. */
void
pstream_close(struct pstream *pstream)
{
if (pstream != NULL) {
char *name = pstream->name;
(pstream->class->close)(pstream);
free(name);
}
}
/* Tries to accept a new connection on 'pstream'. If successful, stores the
* new connection in '*new_stream' and returns 0. Otherwise, returns a
* positive errno value.
*
* pstream_accept() will not block waiting for a connection. If no connection
* is ready to be accepted, it returns EAGAIN immediately. */
int
pstream_accept(struct pstream *pstream, struct stream **new_stream)
{
int retval = (pstream->class->accept)(pstream, new_stream);
if (retval) {
*new_stream = NULL;
} else {
assert((*new_stream)->state != SCS_CONNECTING
|| (*new_stream)->class->connect);
}
return retval;
}
/* Tries to accept a new connection on 'pstream'. If successful, stores the
* new connection in '*new_stream' and returns 0. Otherwise, returns a
* positive errno value.
*
* pstream_accept_block() blocks until a connection is ready or until an error
* occurs. It will not return EAGAIN. */
int
pstream_accept_block(struct pstream *pstream, struct stream **new_stream)
{
int error;
fatal_signal_run();
while ((error = pstream_accept(pstream, new_stream)) == EAGAIN) {
pstream_wait(pstream);
poll_block();
}
if (error) {
*new_stream = NULL;
}
return error;
}
void
pstream_wait(struct pstream *pstream)
{
(pstream->class->wait)(pstream);
}
/* Initializes 'stream' as a new stream named 'name', implemented via 'class'.
* The initial connection status, supplied as 'connect_status', is interpreted
* as follows:
*
* - 0: 'stream' is connected. Its 'send' and 'recv' functions may be
* called in the normal fashion.
*
* - EAGAIN: 'stream' is trying to complete a connection. Its 'connect'
* function should be called to complete the connection.
*
* - Other positive errno values indicate that the connection failed with
* the specified error.
*
* After calling this function, stream_close() must be used to destroy
* 'stream', otherwise resources will be leaked.
*
* The caller retains ownership of 'name'. */
void
stream_init(struct stream *stream, const struct stream_class *class,
int connect_status, const char *name)
{
memset(stream, 0, sizeof *stream);
stream->class = class;
stream->state = (connect_status == EAGAIN ? SCS_CONNECTING
: !connect_status ? SCS_CONNECTED
: SCS_DISCONNECTED);
stream->error = connect_status;
stream->name = xstrdup(name);
assert(stream->state != SCS_CONNECTING || class->connect);
}
void
stream_set_remote_ip(struct stream *stream, ovs_be32 ip)
{
stream->remote_ip = ip;
}
void
stream_set_remote_port(struct stream *stream, ovs_be16 port)
{
stream->remote_port = port;
}
void
stream_set_local_ip(struct stream *stream, ovs_be32 ip)
{
stream->local_ip = ip;
}
void
stream_set_local_port(struct stream *stream, ovs_be16 port)
{
stream->local_port = port;
}
void
pstream_init(struct pstream *pstream, const struct pstream_class *class,
const char *name)
{
pstream->class = class;
pstream->name = xstrdup(name);
}
static int
count_fields(const char *s_)
{
char *s, *field, *save_ptr;
int n = 0;
save_ptr = NULL;
s = xstrdup(s_);
for (field = strtok_r(s, ":", &save_ptr); field != NULL;
field = strtok_r(NULL, ":", &save_ptr)) {
n++;
}
free(s);
return n;
}
/* Like stream_open(), but for tcp streams the port defaults to
* 'default_tcp_port' if no port number is given and for SSL streams the port
* defaults to 'default_ssl_port' if no port number is given. */
int
stream_open_with_default_ports(const char *name_,
uint16_t default_tcp_port,
uint16_t default_ssl_port,
struct stream **streamp)
{
char *name;
int error;
if (!strncmp(name_, "tcp:", 4) && count_fields(name_) < 3) {
name = xasprintf("%s:%d", name_, default_tcp_port);
} else if (!strncmp(name_, "ssl:", 4) && count_fields(name_) < 3) {
name = xasprintf("%s:%d", name_, default_ssl_port);
} else {
name = xstrdup(name_);
}
error = stream_open(name, streamp);
free(name);
return error;
}
/* Like pstream_open(), but for ptcp streams the port defaults to
* 'default_ptcp_port' if no port number is given and for passive SSL streams
* the port defaults to 'default_pssl_port' if no port number is given. */
int
pstream_open_with_default_ports(const char *name_,
uint16_t default_ptcp_port,
uint16_t default_pssl_port,
struct pstream **pstreamp)
{
char *name;
int error;
if (!strncmp(name_, "ptcp:", 5) && count_fields(name_) < 2) {
name = xasprintf("%s%d", name_, default_ptcp_port);
} else if (!strncmp(name_, "pssl:", 5) && count_fields(name_) < 2) {
name = xasprintf("%s%d", name_, default_pssl_port);
} else {
name = xstrdup(name_);
}
error = pstream_open(name, pstreamp);
free(name);
return error;
}
/* Attempts to guess the content type of a stream whose first few bytes were
* the 'size' bytes of 'data'. */
static enum stream_content_type
stream_guess_content(const uint8_t *data, ssize_t size)
{
if (size >= 2) {
#define PAIR(A, B) (((A) << 8) | (B))
switch (PAIR(data[0], data[1])) {
case PAIR(0x16, 0x03): /* Handshake, version 3. */
return STREAM_SSL;
case PAIR('{', '"'):
return STREAM_JSONRPC;
case PAIR(OFP_VERSION, OFPT_HELLO):
return STREAM_OPENFLOW;
}
}
return STREAM_UNKNOWN;
}
/* Returns a string represenation of 'type'. */
static const char *
stream_content_type_to_string(enum stream_content_type type)
{
switch (type) {
case STREAM_UNKNOWN:
default:
return "unknown";
case STREAM_JSONRPC:
return "JSON-RPC";
case STREAM_OPENFLOW:
return "OpenFlow";
case STREAM_SSL:
return "SSL";
}
}
/* Attempts to guess the content type of a stream whose first few bytes were
* the 'size' bytes of 'data'. If this is done successfully, and the guessed
* content type is other than 'expected_type', then log a message in vlog
* module 'module', naming 'stream_name' as the source, explaining what
* content was expected and what was actually received. */
void
stream_report_content(const void *data, ssize_t size,
enum stream_content_type expected_type,
struct vlog_module *module, const char *stream_name)
{
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 5);
enum stream_content_type actual_type;
actual_type = stream_guess_content(data, size);
if (actual_type != expected_type && actual_type != STREAM_UNKNOWN) {
vlog_rate_limit(module, VLL_WARN, &rl,
"%s: received %s data on %s channel",
stream_name,
stream_content_type_to_string(actual_type),
stream_content_type_to_string(expected_type));
}
}
|