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/*
* Protocol registration functions.
*
* Copyright 2000-2012 Willy Tarreau <w@1wt.eu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <haproxy/api.h>
#include <haproxy/errors.h>
#include <haproxy/global.h>
#include <haproxy/list.h>
#include <haproxy/listener.h>
#include <haproxy/proto_quic.h>
#include <haproxy/protocol.h>
#include <haproxy/proxy.h>
#include <haproxy/sock.h>
#include <haproxy/tools.h>
/* List head of all registered protocols */
static struct list protocols = LIST_HEAD_INIT(protocols);
struct protocol *__protocol_by_family[AF_CUST_MAX][PROTO_NUM_TYPES][2] __read_mostly = { };
/* This is the global spinlock we may need to register/unregister listeners or
* protocols. Its main purpose is in fact to serialize the rare stop/deinit()
* phases.
*/
__decl_spinlock(proto_lock);
/* Registers the protocol <proto> */
void protocol_register(struct protocol *proto)
{
int sock_domain = proto->fam->sock_domain;
BUG_ON(sock_domain < 0 || sock_domain >= AF_CUST_MAX);
BUG_ON(proto->proto_type >= PROTO_NUM_TYPES);
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
LIST_APPEND(&protocols, &proto->list);
__protocol_by_family[sock_domain]
[proto->proto_type]
[proto->xprt_type == PROTO_TYPE_DGRAM] = proto;
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
}
/* Unregisters the protocol <proto>. Note that all listeners must have
* previously been unbound.
*/
void protocol_unregister(struct protocol *proto)
{
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
LIST_DELETE(&proto->list);
LIST_INIT(&proto->list);
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
}
/* clears flag <flag> on all protocols. */
void protocol_clrf_all(uint flag)
{
struct protocol *proto;
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
list_for_each_entry(proto, &protocols, list)
proto->flags &= ~flag;
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
}
/* sets flag <flag> on all protocols. */
void protocol_setf_all(uint flag)
{
struct protocol *proto;
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
list_for_each_entry(proto, &protocols, list)
proto->flags |= flag;
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
}
/* Checks if protocol <proto> supports PROTO_F flag <flag>. Returns zero if not,
* non-zero if supported. It may return a cached value from a previous test,
* and may run live tests then update the proto's flags to cache a result. It's
* better to call it only if needed so that it doesn't result in modules being
* loaded in case of a live test. It is only supposed to be used during boot.
*/
int protocol_supports_flag(struct protocol *proto, uint flag)
{
if (flag == PROTO_F_REUSEPORT_SUPPORTED) {
int ret = 0;
/* check if the protocol supports SO_REUSEPORT */
if (!(_HA_ATOMIC_LOAD(&proto->flags) & PROTO_F_REUSEPORT_SUPPORTED))
return 0;
/* at least nobody said it was not supported */
if (_HA_ATOMIC_LOAD(&proto->flags) & PROTO_F_REUSEPORT_TESTED)
return 1;
/* run a live check */
ret = _sock_supports_reuseport(proto->fam, proto->sock_type, proto->sock_prot);
if (!ret)
_HA_ATOMIC_AND(&proto->flags, ~PROTO_F_REUSEPORT_SUPPORTED);
_HA_ATOMIC_OR(&proto->flags, PROTO_F_REUSEPORT_TESTED);
return ret;
}
return 0;
}
#ifdef USE_QUIC
/* Return 1 if QUIC protocol may be bound, 0 if no, depending on the tuning
* parameters.
*/
static inline int protocol_may_bind_quic(struct listener *l)
{
if (global.tune.options & GTUNE_NO_QUIC)
return 0;
return 1;
}
#endif
/* binds all listeners of all registered protocols. Returns a composition
* of ERR_NONE, ERR_RETRYABLE, ERR_FATAL.
*/
int protocol_bind_all(int verbose)
{
struct protocol *proto;
struct listener *listener;
struct receiver *receiver;
char msg[1000];
char *errmsg;
int err, lerr;
err = 0;
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
list_for_each_entry(proto, &protocols, list) {
list_for_each_entry(receiver, &proto->receivers, proto_list) {
listener = LIST_ELEM(receiver, struct listener *, rx);
#ifdef USE_QUIC
if ((proto == &proto_quic4 || proto == &proto_quic6) &&
!protocol_may_bind_quic(listener))
continue;
#endif
lerr = proto->fam->bind(receiver, &errmsg);
err |= lerr;
/* errors are reported if <verbose> is set or if they are fatal */
if (verbose || (lerr & (ERR_FATAL | ERR_ABORT))) {
struct proxy *px = listener->bind_conf->frontend;
if (lerr & ERR_ALERT)
ha_alert("Binding [%s:%d] for %s %s: %s\n",
listener->bind_conf->file, listener->bind_conf->line,
proxy_type_str(px), px->id, errmsg);
else if (lerr & ERR_WARN)
ha_warning("Binding [%s:%d] for %s %s: %s\n",
listener->bind_conf->file, listener->bind_conf->line,
proxy_type_str(px), px->id, errmsg);
}
if (lerr != ERR_NONE)
ha_free(&errmsg);
if (lerr & ERR_ABORT)
break;
if (lerr & ~ERR_WARN)
continue;
/* for now there's still always a listening function */
BUG_ON(!proto->listen);
lerr = proto->listen(listener, msg, sizeof(msg));
err |= lerr;
if (verbose || (lerr & (ERR_FATAL | ERR_ABORT))) {
struct proxy *px = listener->bind_conf->frontend;
if (lerr & ERR_ALERT)
ha_alert("Starting [%s:%d] for %s %s: %s\n",
listener->bind_conf->file, listener->bind_conf->line,
proxy_type_str(px), px->id, msg);
else if (lerr & ERR_WARN)
ha_warning("Starting [%s:%d] for %s %s: %s\n",
listener->bind_conf->file, listener->bind_conf->line,
proxy_type_str(px), px->id, msg);
}
if (lerr & ERR_ABORT)
break;
}
if (err & ERR_ABORT)
break;
}
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
return err;
}
/* unbinds all listeners of all registered protocols. They are also closed.
* This must be performed before calling exit() in order to get a chance to
* remove file-system based sockets and pipes.
* Returns a composition of ERR_NONE, ERR_RETRYABLE, ERR_FATAL, ERR_ABORT.
*/
int protocol_unbind_all(void)
{
struct protocol *proto;
struct listener *listener;
int err;
err = 0;
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
list_for_each_entry(proto, &protocols, list) {
list_for_each_entry(listener, &proto->receivers, rx.proto_list)
unbind_listener(listener);
}
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
return err;
}
/* stops all listeners of all registered protocols. This will normally catch
* every single listener, all protocols included. This is to be used during
* soft_stop() only. It does not return any error.
*/
void protocol_stop_now(void)
{
struct protocol *proto;
struct listener *listener, *lback;
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
list_for_each_entry(proto, &protocols, list) {
list_for_each_entry_safe(listener, lback, &proto->receivers, rx.proto_list)
stop_listener(listener, 0, 1, 0);
}
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
}
/* suspends all listeners of all registered protocols. This is typically
* used on SIG_TTOU to release all listening sockets for the time needed to
* try to bind a new process. The listeners enter LI_PAUSED or LI_ASSIGNED.
* It returns ERR_NONE, with ERR_FATAL on failure.
*/
int protocol_pause_all(void)
{
struct protocol *proto;
struct listener *listener;
int err;
err = 0;
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
list_for_each_entry(proto, &protocols, list) {
list_for_each_entry(listener, &proto->receivers, rx.proto_list)
if (!suspend_listener(listener, 0, 0))
err |= ERR_FATAL;
}
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
return err;
}
/* resumes all listeners of all registered protocols. This is typically used on
* SIG_TTIN to re-enable listening sockets after a new process failed to bind.
* The listeners switch to LI_READY/LI_FULL. It returns ERR_NONE, with ERR_FATAL
* on failure.
*/
int protocol_resume_all(void)
{
struct protocol *proto;
struct listener *listener;
int err;
err = 0;
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
list_for_each_entry(proto, &protocols, list) {
list_for_each_entry(listener, &proto->receivers, rx.proto_list)
if (!resume_listener(listener, 0, 0))
err |= ERR_FATAL;
}
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
return err;
}
/* enables all listeners of all registered protocols. This is intended to be
* used after a fork() to enable reading on all file descriptors. Returns
* composition of ERR_NONE.
*/
int protocol_enable_all(void)
{
struct protocol *proto;
struct listener *listener;
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
list_for_each_entry(proto, &protocols, list) {
list_for_each_entry(listener, &proto->receivers, rx.proto_list)
enable_listener(listener);
}
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
return ERR_NONE;
}
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/
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