Adding upstream version 5.7.1.upstream/5.7.1

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

1 files changed, 195 insertions, 0 deletions

diff --git a/daemon/worker.h b/daemon/worker.h
new file mode 100644
index 0000000..fd9b1f3
--- /dev/null
+++ b/daemon/worker.h
@@ -0,0 +1,195 @@
+/*  Copyright (C) CZ.NIC, z.s.p.o. <knot-resolver@labs.nic.cz>
+ *  SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include "daemon/engine.h"
+#include "lib/generic/array.h"
+#include "lib/generic/trie.h"
+
+
+/** Query resolution task (opaque). */
+struct qr_task;
+/** Worker state (opaque). */
+struct worker_ctx;
+/** Transport session (opaque). */
+struct session;
+/** Zone import context (opaque). */
+struct zone_import_ctx;
+/** Data about the communication (defined in io.h). */
+struct io_comm_data;
+
+/** Pointer to the singleton worker.  NULL if not initialized. */
+KR_EXPORT extern struct worker_ctx *the_worker;
+
+/** Create and initialize the worker.
+ * \return error code (ENOMEM) */
+int worker_init(struct engine *engine, int worker_count);
+
+/** Destroy the worker (free memory). */
+void worker_deinit(void);
+
+/**
+ * Process an incoming packet (query from a client or answer from upstream).
+ *
+ * @param session     session the packet came from, or NULL (not from network)
+ * @param comm        IO communication data (see `struct io_comm_data` docs)
+ * @param eth_*       MAC addresses or NULL (they're useful for XDP)
+ * @param pkt         the packet, or NULL (an error from the transport layer)
+ * @return 0 or an error code
+ */
+int worker_submit(struct session *session, struct io_comm_data *comm,
+                  const uint8_t *eth_from, const uint8_t *eth_to, knot_pkt_t *pkt);
+
+/**
+ * End current DNS/TCP session, this disassociates pending tasks from this session
+ * which may be freely closed afterwards.
+ */
+int worker_end_tcp(struct session *session);
+
+KR_EXPORT knot_pkt_t *worker_resolve_mk_pkt_dname(knot_dname_t *qname, uint16_t qtype, uint16_t qclass,
+				   const struct kr_qflags *options);
+
+/**
+ * Create a packet suitable for worker_resolve_start().  All in malloc() memory.
+ */
+KR_EXPORT knot_pkt_t *
+worker_resolve_mk_pkt(const char *qname_str, uint16_t qtype, uint16_t qclass,
+			const struct kr_qflags *options);
+
+/**
+ * Start query resolution with given query.
+ *
+ * @return task or NULL
+ */
+KR_EXPORT struct qr_task *
+worker_resolve_start(knot_pkt_t *query, struct kr_qflags options);
+
+/**
+ * Execute a request with given query.
+ * It expects task to be created with \fn worker_resolve_start.
+ *
+ * @return 0 or an error code
+ */
+KR_EXPORT int worker_resolve_exec(struct qr_task *task, knot_pkt_t *query);
+
+/** @return struct kr_request associated with opaque task */
+struct kr_request *worker_task_request(struct qr_task *task);
+
+int worker_task_step(struct qr_task *task, const struct sockaddr *packet_source,
+		     knot_pkt_t *packet);
+
+int worker_task_numrefs(const struct qr_task *task);
+
+/** Finalize given task */
+int worker_task_finalize(struct qr_task *task, int state);
+
+void worker_task_complete(struct qr_task *task);
+
+void worker_task_ref(struct qr_task *task);
+
+void worker_task_unref(struct qr_task *task);
+
+void worker_task_timeout_inc(struct qr_task *task);
+
+int worker_add_tcp_connected(struct worker_ctx *worker,
+			     const struct sockaddr *addr,
+			     struct session *session);
+int worker_del_tcp_connected(struct worker_ctx *worker,
+			     const struct sockaddr *addr);
+int worker_del_tcp_waiting(struct worker_ctx *worker,
+			   const struct sockaddr* addr);
+struct session* worker_find_tcp_waiting(struct worker_ctx *worker,
+					       const struct sockaddr* addr);
+struct session* worker_find_tcp_connected(struct worker_ctx *worker,
+					       const struct sockaddr* addr);
+knot_pkt_t *worker_task_get_pktbuf(const struct qr_task *task);
+
+struct request_ctx *worker_task_get_request(struct qr_task *task);
+
+struct kr_transport *worker_task_get_transport(struct qr_task *task);
+
+/** Note: source session is NULL in case the request hasn't come over network. */
+KR_EXPORT struct session *worker_request_get_source_session(const struct kr_request *req);
+
+uint16_t worker_task_pkt_get_msgid(struct qr_task *task);
+void worker_task_pkt_set_msgid(struct qr_task *task, uint16_t msgid);
+uint64_t worker_task_creation_time(struct qr_task *task);
+void worker_task_subreq_finalize(struct qr_task *task);
+bool worker_task_finished(struct qr_task *task);
+
+/** To be called after sending a DNS message.  It mainly deals with cleanups. */
+int qr_task_on_send(struct qr_task *task, const uv_handle_t *handle, int status);
+
+/** Various worker statistics.  Sync with wrk_stats() */
+struct worker_stats {
+	size_t queries;     /**< Total number of requests (from clients and internal ones). */
+	size_t concurrent;  /**< The number of requests currently in processing. */
+	size_t rconcurrent; /*< TODO: remove?  I see no meaningful difference from .concurrent. */
+	size_t dropped;     /**< The number of requests dropped due to being badly formed.  See #471. */
+
+	size_t timeout; /**< Number of outbound queries that timed out. */
+	size_t udp;  /**< Number of outbound queries over UDP. */
+	size_t tcp;  /**< Number of outbound queries over TCP (excluding TLS). */
+	size_t tls;  /**< Number of outbound queries over TLS. */
+	size_t ipv4; /**< Number of outbound queries over IPv4.*/
+	size_t ipv6; /**< Number of outbound queries over IPv6. */
+
+	size_t err_udp;  /**< Total number of write errors for UDP transport. */
+	size_t err_tcp;  /**< Total number of write errors for TCP transport. */
+	size_t err_tls;  /**< Total number of write errors for TLS transport. */
+	size_t err_http;  /**< Total number of write errors for HTTP(S) transport. */
+};
+
+/** @cond internal */
+
+/** Number of request within timeout window. */
+#define MAX_PENDING 4
+
+/** Maximum response time from TCP upstream, milliseconds */
+#define MAX_TCP_INACTIVITY (KR_RESOLVE_TIME_LIMIT + KR_CONN_RTT_MAX)
+
+#ifndef RECVMMSG_BATCH /* see check_bufsize() */
+#define RECVMMSG_BATCH 1
+#endif
+
+/** List of query resolution tasks. */
+typedef array_t(struct qr_task *) qr_tasklist_t;
+
+/** List of HTTP header names. */
+typedef array_t(const char *) doh_headerlist_t;
+
+/** \details Worker state is meant to persist during the whole life of daemon. */
+struct worker_ctx {
+	struct engine *engine;
+	uv_loop_t *loop;
+	int count;  /** unreliable, does not count systemd instance, do not use */
+	int vars_table_ref;
+	unsigned tcp_pipeline_max;
+
+	/** Addresses to bind for outgoing connections or AF_UNSPEC. */
+	struct sockaddr_in out_addr4;
+	struct sockaddr_in6 out_addr6;
+
+	uint8_t wire_buf[RECVMMSG_BATCH * KNOT_WIRE_MAX_PKTSIZE];
+
+	struct worker_stats stats;
+
+	bool too_many_open;
+	size_t rconcurrent_highwatermark;
+	/** List of active outbound TCP sessions */
+	trie_t *tcp_connected;
+	/** List of outbound TCP sessions waiting to be accepted */
+	trie_t *tcp_waiting;
+	/** Subrequest leaders (struct qr_task*), indexed by qname+qtype+qclass. */
+	trie_t *subreq_out;
+	knot_mm_t pkt_pool;
+	unsigned int next_request_uid;
+
+	/* HTTP Headers for DoH. */
+	doh_headerlist_t doh_qry_headers;
+};
+
+/** @endcond */
+