Adding upstream version 2.9.5.upstream/2.9.5

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 464 insertions, 0 deletions

diff --git a/src/proto_rhttp.c b/src/proto_rhttp.c
new file mode 100644
index 0000000..452ee32
--- /dev/null
+++ b/src/proto_rhttp.c
@@ -0,0 +1,464 @@
+#include <stdio.h>
+#include <string.h>
+
+#include <haproxy/api.h>
+#include <haproxy/connection.h>
+#include <haproxy/errors.h>
+#include <haproxy/intops.h>
+#include <haproxy/list.h>
+#include <haproxy/listener.h>
+#include <haproxy/log.h>
+#include <haproxy/proto_tcp.h>
+#include <haproxy/protocol.h>
+#include <haproxy/proxy.h>
+#include <haproxy/sample.h>
+#include <haproxy/server.h>
+#include <haproxy/sock.h>
+#include <haproxy/ssl_sock.h>
+#include <haproxy/task.h>
+
+#include <haproxy/proto_rhttp.h>
+
+struct proto_fam proto_fam_rhttp = {
+	.name = "rhttp",
+	.sock_domain = AF_CUST_RHTTP_SRV,
+	.sock_family = AF_INET,
+	.bind = rhttp_bind_receiver,
+};
+
+struct protocol proto_rhttp = {
+	.name = "rev",
+
+	/* connection layer (no outgoing connection) */
+	.listen      = rhttp_bind_listener,
+	.enable      = rhttp_enable_listener,
+	.disable     = rhttp_disable_listener,
+	.add         = default_add_listener,
+	.unbind      = rhttp_unbind_receiver,
+	.resume      = default_resume_listener,
+	.accept_conn = rhttp_accept_conn,
+	.set_affinity = rhttp_set_affinity,
+
+	/* address family */
+	.fam  = &proto_fam_rhttp,
+
+	/* socket layer */
+	.proto_type     = PROTO_TYPE_STREAM,
+	.sock_type      = SOCK_STREAM,
+	.sock_prot      = IPPROTO_TCP,
+	.rx_listening   = rhttp_accepting_conn,
+	.receivers      = LIST_HEAD_INIT(proto_rhttp.receivers),
+};
+
+static struct connection *new_reverse_conn(struct listener *l, struct server *srv)
+{
+	struct connection *conn = conn_new(srv);
+	struct sockaddr_storage *bind_addr = NULL;
+	if (!conn)
+		goto err;
+
+	HA_ATOMIC_INC(&th_ctx->nb_rhttp_conns);
+
+	conn_set_reverse(conn, &l->obj_type);
+
+	if (alloc_bind_address(&bind_addr, srv, srv->proxy, NULL) != SRV_STATUS_OK)
+		goto err;
+	conn->src = bind_addr;
+
+	sockaddr_alloc(&conn->dst, 0, 0);
+	if (!conn->dst)
+		goto err;
+	*conn->dst = srv->addr;
+	set_host_port(conn->dst, srv->svc_port);
+
+	if (conn_prepare(conn, protocol_lookup(conn->dst->ss_family, PROTO_TYPE_STREAM, 0), srv->xprt))
+		goto err;
+
+	if (conn->ctrl->connect(conn, 0) != SF_ERR_NONE)
+		goto err;
+
+#ifdef USE_OPENSSL
+	if (srv->ssl_ctx.sni) {
+		struct sample *sni_smp = NULL;
+		/* TODO remove NULL session which can cause crash depending on the SNI sample expr used. */
+		sni_smp = sample_fetch_as_type(srv->proxy, NULL, NULL,
+		                               SMP_OPT_DIR_REQ | SMP_OPT_FINAL,
+		                               srv->ssl_ctx.sni, SMP_T_STR);
+		if (smp_make_safe(sni_smp))
+			ssl_sock_set_servername(conn, sni_smp->data.u.str.area);
+	}
+#endif /* USE_OPENSSL */
+
+	if (conn_xprt_start(conn) < 0)
+		goto err;
+
+	if (!srv->use_ssl ||
+	    (!srv->ssl_ctx.alpn_str && !srv->ssl_ctx.npn_str) ||
+	    srv->mux_proto) {
+		if (conn_install_mux_be(conn, NULL, NULL, NULL) < 0)
+			goto err;
+	}
+
+	/* Not expected here. */
+	BUG_ON((conn->flags & CO_FL_HANDSHAKE));
+	return conn;
+
+ err:
+	if (conn) {
+		conn_stop_tracking(conn);
+		conn_xprt_shutw(conn);
+		conn_xprt_close(conn);
+		conn_sock_shutw(conn, 0);
+		conn_ctrl_close(conn);
+
+		if (conn->destroy_cb)
+			conn->destroy_cb(conn);
+
+		/* Mark connection as non-reversable. This prevents conn_free()
+		 * to reschedule rhttp task on freeing a preconnect connection.
+		 */
+		conn->reverse.target = NULL;
+		conn_free(conn);
+	}
+
+	return NULL;
+}
+
+/* Report that a connection used for preconnect on listener <l> is freed before
+ * reversal is completed. This is used to cleanup any reference to the
+ * connection and rearm a new preconnect attempt.
+ */
+void rhttp_notify_preconn_err(struct listener *l)
+{
+	/* Receiver must reference a reverse connection as pending. */
+	BUG_ON(!l->rx.rhttp.pend_conn);
+
+	/* Remove reference to the freed connection. */
+	l->rx.rhttp.pend_conn = NULL;
+
+	if (l->rx.rhttp.state != LI_PRECONN_ST_ERR) {
+		send_log(l->bind_conf->frontend, LOG_ERR,
+		        "preconnect %s::%s: Error encountered.\n",
+		         l->bind_conf->frontend->id, l->bind_conf->rhttp_srvname);
+		l->rx.rhttp.state = LI_PRECONN_ST_ERR;
+	}
+
+	/* Rearm a new preconnect attempt. */
+	l->rx.rhttp.task->expire = MS_TO_TICKS(now_ms + 1000);
+	task_queue(l->rx.rhttp.task);
+}
+
+/* Lookup over listener <l> threads for their current count of active reverse
+ * HTTP connections. Returns the less loaded thread ID.
+ */
+static unsigned int select_thread(struct listener *l)
+{
+	unsigned long mask = l->rx.bind_thread & _HA_ATOMIC_LOAD(&tg->threads_enabled);
+	unsigned int load_min = HA_ATOMIC_LOAD(&th_ctx->nb_rhttp_conns);
+	unsigned int load_thr;
+	unsigned int ret = tid;
+	int i;
+
+	/* Returns current tid if listener runs on one thread only. */
+	if (!atleast2(mask))
+		goto end;
+
+	/* Loop over all threads and return the less loaded one. This needs to
+	 * be just an approximation so it's not important if the selected
+	 * thread load has varied since its selection.
+	 */
+
+	for (i = tg->base; mask; mask >>= 1, i++) {
+		if (!(mask & 0x1))
+			continue;
+
+		load_thr = HA_ATOMIC_LOAD(&ha_thread_ctx[i].nb_rhttp_conns);
+		if (load_min > load_thr) {
+			ret = i;
+			load_min = load_thr;
+		}
+	}
+
+ end:
+	return ret;
+}
+
+/* Detach <task> from its thread and assign it to <new_tid> thread. The task is
+ * queued to be woken up on the new thread.
+ */
+static void task_migrate(struct task *task, uint new_tid)
+{
+	task_unlink_wq(task);
+	task->expire = TICK_ETERNITY;
+	task_set_thread(task, new_tid);
+	task_wakeup(task, TASK_WOKEN_MSG);
+}
+
+struct task *rhttp_process(struct task *task, void *ctx, unsigned int state)
+{
+	struct listener *l = ctx;
+	struct connection *conn = l->rx.rhttp.pend_conn;
+
+	if (conn) {
+		/* Either connection is on error ot the connect timeout fired. */
+		if (conn->flags & CO_FL_ERROR || tick_is_expired(task->expire, now_ms)) {
+			/* If mux already instantiated, let it release the
+			 * connection along with its context. Else do cleanup
+			 * directly.
+			 */
+			if (conn->mux && conn->mux->destroy) {
+				conn->mux->destroy(conn->ctx);
+			}
+			else {
+				conn_stop_tracking(conn);
+				conn_xprt_shutw(conn);
+				conn_xprt_close(conn);
+				conn_sock_shutw(conn, 0);
+				conn_ctrl_close(conn);
+
+				if (conn->destroy_cb)
+					conn->destroy_cb(conn);
+				conn_free(conn);
+			}
+
+			/* conn_free() must report preconnect failure using rhttp_notify_preconn_err(). */
+			BUG_ON(l->rx.rhttp.pend_conn);
+
+			l->rx.rhttp.task->expire = TICKS_TO_MS(now_ms);
+		}
+		else {
+			/* Spurious receiver task woken up despite pend_conn not ready/on error. */
+			BUG_ON(!(conn->flags & CO_FL_ACT_REVERSING));
+
+			/* A connection is ready to be accepted. */
+			listener_accept(l);
+			l->rx.rhttp.task->expire = TICK_ETERNITY;
+		}
+	}
+	else {
+		struct server *srv = l->rx.rhttp.srv;
+
+		if ((state & TASK_WOKEN_ANY) != TASK_WOKEN_MSG) {
+			unsigned int new_tid = select_thread(l);
+			if (new_tid != tid) {
+				task_migrate(l->rx.rhttp.task, new_tid);
+				return task;
+			}
+		}
+
+		/* No pending reverse connection, prepare a new one. Store it in the
+		 * listener and return NULL. Connection will be returned later after
+		 * reversal is completed.
+		 */
+		conn = new_reverse_conn(l, srv);
+		l->rx.rhttp.pend_conn = conn;
+
+		/* On success task will be woken up by H2 mux after reversal. */
+		l->rx.rhttp.task->expire = conn ?
+		  tick_add_ifset(now_ms, srv->proxy->timeout.connect) :
+		  MS_TO_TICKS(now_ms + 1000);
+	}
+
+	return task;
+}
+
+int rhttp_bind_receiver(struct receiver *rx, char **errmsg)
+{
+	rx->flags |= RX_F_BOUND;
+	return ERR_NONE;
+}
+
+int rhttp_bind_listener(struct listener *listener, char *errmsg, int errlen)
+{
+	struct task *task;
+	struct proxy *be;
+	struct server *srv;
+	struct ist be_name, sv_name;
+	char *name = NULL;
+
+	unsigned long mask;
+	uint task_tid;
+
+	if (listener->state != LI_ASSIGNED)
+		return ERR_NONE; /* already bound */
+
+	/* Retrieve the first thread usable for this listener. */
+	mask = listener->rx.bind_thread & _HA_ATOMIC_LOAD(&tg->threads_enabled);
+	task_tid = my_ffsl(mask) + ha_tgroup_info[listener->rx.bind_tgroup].base;
+	if (!(task = task_new_on(task_tid))) {
+		snprintf(errmsg, errlen, "Out of memory.");
+		goto err;
+	}
+	task->process = rhttp_process;
+	task->context = listener;
+	listener->rx.rhttp.task = task;
+	listener->rx.rhttp.state = LI_PRECONN_ST_STOP;
+
+	/* Set maxconn which is defined via the special kw nbconn for reverse
+	 * connect. Use a default value of 1 if not set. This guarantees that
+	 * listener will be automatically re-enable each time it fell back below
+	 * it due to a connection error.
+	 */
+	listener->bind_conf->maxconn = listener->bind_conf->rhttp_nbconn;
+	if (!listener->bind_conf->maxconn)
+		listener->bind_conf->maxconn = 1;
+
+	name = strdup(listener->bind_conf->rhttp_srvname);
+	if (!name) {
+		snprintf(errmsg, errlen, "Out of memory.");
+		goto err;
+	}
+
+	sv_name = ist(name);
+	be_name = istsplit(&sv_name, '/');
+	if (!istlen(sv_name)) {
+		snprintf(errmsg, errlen, "Invalid server name: '%s'.", name);
+		goto err;
+	}
+
+	if (!(be = proxy_be_by_name(ist0(be_name)))) {
+		snprintf(errmsg, errlen, "No such backend: '%s'.", name);
+		goto err;
+	}
+	if (!(srv = server_find_by_name(be, ist0(sv_name)))) {
+		snprintf(errmsg, errlen, "No such server: '%s/%s'.", ist0(be_name), ist0(sv_name));
+		goto err;
+	}
+
+	if (srv->flags & SRV_F_RHTTP) {
+		snprintf(errmsg, errlen, "Cannot use reverse HTTP server '%s/%s' as target to a reverse bind.", ist0(be_name), ist0(sv_name));
+		goto err;
+	}
+
+	if (srv_is_transparent(srv)) {
+		snprintf(errmsg, errlen, "Cannot use transparent server '%s/%s' as target to a reverse bind.", ist0(be_name), ist0(sv_name));
+		goto err;
+	}
+
+	/* Check that server uses HTTP/2 either with proto or ALPN. */
+	if ((!srv->mux_proto || !isteqi(srv->mux_proto->token, ist("h2"))) &&
+	    (!srv->use_ssl || !isteqi(ist(srv->ssl_ctx.alpn_str), ist("\x02h2")))) {
+		snprintf(errmsg, errlen, "Cannot reverse connect with server '%s/%s' unless HTTP/2 is activated on it with either proto or alpn keyword.", name, ist0(sv_name));
+		goto err;
+	}
+
+	/* Prevent dynamic source address settings. */
+	if (((srv->conn_src.opts & CO_SRC_TPROXY_MASK) &&
+	     (srv->conn_src.opts & CO_SRC_TPROXY_MASK) != CO_SRC_TPROXY_ADDR) ||
+	    ((srv->proxy->conn_src.opts & CO_SRC_TPROXY_MASK) &&
+	     (srv->proxy->conn_src.opts & CO_SRC_TPROXY_MASK) != CO_SRC_TPROXY_ADDR)) {
+		snprintf(errmsg, errlen, "Cannot reverse connect with server '%s/%s' which uses dynamic source address setting.", name, ist0(sv_name));
+		goto err;
+	}
+
+	ha_free(&name);
+
+	listener->rx.rhttp.srv = srv;
+	listener_set_state(listener, LI_LISTEN);
+
+	return ERR_NONE;
+
+ err:
+	ha_free(&name);
+	return ERR_ALERT | ERR_FATAL;
+}
+
+void rhttp_enable_listener(struct listener *l)
+{
+	if (l->rx.rhttp.state < LI_PRECONN_ST_INIT) {
+		send_log(l->bind_conf->frontend, LOG_INFO,
+		         "preconnect %s::%s: Initiating.\n",
+		         l->bind_conf->frontend->id, l->bind_conf->rhttp_srvname);
+		l->rx.rhttp.state = LI_PRECONN_ST_INIT;
+	}
+
+	task_wakeup(l->rx.rhttp.task, TASK_WOKEN_ANY);
+}
+
+void rhttp_disable_listener(struct listener *l)
+{
+	if (l->rx.rhttp.state < LI_PRECONN_ST_FULL) {
+		send_log(l->bind_conf->frontend, LOG_INFO,
+		         "preconnect %s::%s: Running with nbconn %d reached.\n",
+		         l->bind_conf->frontend->id, l->bind_conf->rhttp_srvname,
+		         l->bind_conf->maxconn);
+		l->rx.rhttp.state = LI_PRECONN_ST_FULL;
+	}
+}
+
+struct connection *rhttp_accept_conn(struct listener *l, int *status)
+{
+	struct connection *conn = l->rx.rhttp.pend_conn;
+
+	if (!conn) {
+		/* Reverse connect listener must have an explicit maxconn set
+		 * to ensure it is re-enabled on connection error.
+		 */
+		BUG_ON(!l->bind_conf->maxconn);
+
+		/* Instantiate a new conn if maxconn not yet exceeded. */
+		if (l->nbconn <= l->bind_conf->maxconn) {
+			/* Try first if a new thread should be used for the new connection. */
+			unsigned int new_tid = select_thread(l);
+			if (new_tid != tid) {
+				task_migrate(l->rx.rhttp.task, new_tid);
+				*status = CO_AC_DONE;
+				return NULL;
+			}
+
+			/* No need to use a new thread, use the opportunity to alloc the connection right now. */
+			l->rx.rhttp.pend_conn = new_reverse_conn(l, l->rx.rhttp.srv);
+			if (!l->rx.rhttp.pend_conn) {
+				*status = CO_AC_PAUSE;
+				return NULL;
+			}
+		}
+
+		*status = CO_AC_DONE;
+		return NULL;
+	}
+
+	/* listener_accept() must not be called if no pending connection is not yet reversed. */
+	BUG_ON(!(conn->flags & CO_FL_ACT_REVERSING));
+	conn->flags &= ~CO_FL_ACT_REVERSING;
+	conn->flags |= CO_FL_REVERSED;
+	conn->mux->ctl(conn, MUX_CTL_REVERSE_CONN, NULL);
+
+	l->rx.rhttp.pend_conn = NULL;
+	*status = CO_AC_NONE;
+
+	return conn;
+}
+
+void rhttp_unbind_receiver(struct listener *l)
+{
+	l->rx.flags &= ~RX_F_BOUND;
+}
+
+int rhttp_set_affinity(struct connection *conn, int new_tid)
+{
+	/* Explicitely disable connection thread migration on accept. Indeed,
+	 * it's unsafe to move a connection with its FD to another thread. Note
+	 * that active reverse task thread migration should be sufficient to
+	 * ensure repartition of reversed connections accross listener threads.
+	 */
+	return -1;
+}
+
+int rhttp_accepting_conn(const struct receiver *rx)
+{
+	return 1;
+}
+
+INITCALL1(STG_REGISTER, protocol_register, &proto_rhttp);
+
+/* perform minimal intializations */
+static void init_rhttp()
+{
+	int i;
+
+	for (i = 0; i < MAX_THREADS; i++)
+		ha_thread_ctx[i].nb_rhttp_conns = 0;
+}
+
+INITCALL0(STG_PREPARE, init_rhttp);