MINOR: quic: get rid of ->target quic_conn struct member

The ->li (struct listener *) member of quic_conn struct was replaced by a
->target (struct obj_type *) member by this commit:

    MINOR: quic-be: get rid of ->li quic_conn member

to abstract the connection type (front or back) when implementing QUIC for the
backends. In these cases, ->target was a pointer to the ojb_type of a server
struct. This could not work with the dynamic servers contrary to the listeners
which are not dynamic.

This patch almost reverts the one mentioned above. ->target pointer to obj_type member
is replaced by ->li pointer to listener struct member. As the listener are not
dynamic, this is easy to do this. All one has to do is to replace the
objt_listener(qc->target) statement by qc->li where applicable.

For the backend connection, when needed, this is always qc->conn->target which is
used only when qc->conn is initialized. The only "problematic" case is for
quic_dgram_parse() which takes a pointer to an obj_type as third argument.
But this obj_type is only used to call quic_rx_pkt_parse(). Inside this function
it is used to access the proxy counters of the connection thanks to qc_counters().
So, this obj_type argument may be null for now on with this patch. This is the
reason why qc_counters() is modified to take this into consideration.

include/haproxy/quic_conn-t.h

@@ -322,7 +322,7 @@ struct qcc_app_ops;
          * with a connection                                                   \
          */                                                                    \
         struct eb_root *cids;                                                  \
-        enum obj_type *target;                                                 \
+        struct listener *li;                                                   \
         /* Idle timer task */                                                  \
         struct task *idle_timer_task;                                          \
         unsigned int idle_expire;                                              \

include/haproxy/quic_conn.h

@@ -173,9 +173,14 @@ static inline void quic_free_ncbuf(struct ncbuf *ncbuf)
 static inline void *qc_counters(enum obj_type *o, const struct stats_module *m)
 {
 	struct proxy *p;
-	struct listener *l = objt_listener(o);
-	struct server *s = objt_server(o);
+	struct listener *l;
+	struct server *s;
 
+	if (!o)
+		return NULL;
+
+	l = objt_listener(o);
+	s = objt_server(o);
 	p = l ? l->bind_conf->frontend :
 		s ? s->proxy : NULL;
 

include/haproxy/quic_sock.h

@@ -79,8 +79,8 @@ static inline char qc_test_fd(struct quic_conn *qc)
  */
 static inline int qc_fd(struct quic_conn *qc)
 {
-	/* TODO: check this: For backends, qc->fd is always initialized */
-	return qc_test_fd(qc) ? qc->fd : __objt_listener(qc->target)->rx.fd;
+	/* For backends, qc->fd is always initialized */
+	return qc_test_fd(qc) ? qc->fd : qc->li->rx.fd;
 }
 
 /* Try to increment <l> handshake current counter. If listener limit is

src/cli.c

@@ -1425,8 +1425,8 @@ static int cli_io_handler_show_fd(struct appctx *appctx)
 #if defined(USE_QUIC)
 		else if (fdt.iocb == quic_conn_sock_fd_iocb) {
 			qc = fdtab[fd].owner;
-			li = qc ? objt_listener(qc->target) : NULL;
-			sv = qc ? objt_server(qc->target) : NULL;
+			li = qc ? qc->li : NULL;
+			sv = qc ? (qc->conn ? objt_server(qc->conn->target) : NULL) : NULL;
 			xprt_ctx   = qc ? qc->xprt_ctx : NULL;
 			conn = qc ? qc->conn : NULL;
 			xprt = conn ? conn->xprt : NULL; // in fact it's &ssl_quic

src/quic_cli.c

@@ -181,10 +181,11 @@ static void dump_quic_oneline(struct show_quic_ctx *ctx, struct quic_conn *qc)
 	char bufaddr[INET6_ADDRSTRLEN], bufport[6];
 	int ret;
 	unsigned char cid_len;
-	struct listener *l = objt_listener(qc->target);
+	struct listener *l = qc->li;
 
 	ret = chunk_appendf(&trash, "%p[%02u]/%-.12s ", qc, ctx->thr,
-	                    l ? l->bind_conf->frontend->id : __objt_server(qc->target)->id);
+	                    l ? l->bind_conf->frontend->id :
+	                    qc->conn ? __objt_server(qc->conn->target)->id : "UNKNOWN");
 
 	chunk_appendf(&trash, "%*s", 36 - ret, " "); /* align output */
 

src/quic_conn.c

@@ -749,7 +749,7 @@ static struct quic_conn_closed *qc_new_cc_conn(struct quic_conn *qc)
 	cc_qc->dcid = qc->dcid;
 	cc_qc->scid = qc->scid;
 
-	cc_qc->target = qc->target;
+	cc_qc->li = qc->li;
 	cc_qc->cids = qc->cids;
 
 	cc_qc->idle_timer_task = qc->idle_timer_task;
@@ -1113,7 +1113,7 @@ struct quic_conn *qc_new_conn(const struct quic_version *qv, int ipv4,
 		goto err;
 	}
 
-	qc->target = target;
+	qc->li = l;
 	/* Now that quic_conn instance is allocated, quic_conn_release() will
 	 * ensure global accounting is decremented.
 	 */
@@ -1418,7 +1418,7 @@ int qc_handle_conn_migration(struct quic_conn *qc,
 	 * used during the handshake, unless the endpoint has acted on a
 	 * preferred_address transport parameter from the peer.
 	 */
-	if (__objt_listener(qc->target)->bind_conf->quic_params.disable_active_migration) {
+	if (qc->li->bind_conf->quic_params.disable_active_migration) {
 		TRACE_ERROR("Active migration was disabled, datagram dropped", QUIC_EV_CONN_LPKT, qc);
 		goto err;
 	}
@@ -1548,8 +1548,8 @@ int quic_conn_release(struct quic_conn *qc)
 	 */
 	if (MT_LIST_INLIST(&qc->accept_list)) {
 		MT_LIST_DELETE(&qc->accept_list);
-		BUG_ON(__objt_listener(qc->target)->rx.quic_curr_accept == 0);
-		HA_ATOMIC_DEC(&__objt_listener(qc->target)->rx.quic_curr_accept);
+		BUG_ON(qc->li->rx.quic_curr_accept == 0);
+		HA_ATOMIC_DEC(&qc->li->rx.quic_curr_accept);
 	}
 
 	/* Subtract last congestion window from global memory counter. */
@@ -1622,8 +1622,8 @@ int quic_conn_release(struct quic_conn *qc)
 	/* Connection released before handshake completion. */
 	if (unlikely(qc->state < QUIC_HS_ST_COMPLETE)) {
 		if (!qc_is_back(qc)) {
-			BUG_ON(__objt_listener(qc->target)->rx.quic_curr_handshake == 0);
-			HA_ATOMIC_DEC(&__objt_listener(qc->target)->rx.quic_curr_handshake);
+			BUG_ON(qc->li->rx.quic_curr_handshake == 0);
+			HA_ATOMIC_DEC(&qc->li->rx.quic_curr_handshake);
 		}
 	}
 
@@ -2031,8 +2031,8 @@ void qc_bind_tid_commit(struct quic_conn *qc, struct listener *new_li)
 	/* At this point no connection was accounted for yet on this
 	 * listener so it's OK to just swap the pointer.
 	 */
-	if (new_li && new_li != __objt_listener(qc->target)) {
-		qc->target = &new_li->obj_type;
+	if (new_li && new_li != qc->li) {
+		qc->li = new_li;
 
 		/* Update GSO conn support based on new listener status. */
 		if (HA_ATOMIC_LOAD(&new_li->flags) & LI_F_UDP_GSO_NOTSUPP)

src/quic_rx.c

@@ -1674,7 +1674,9 @@ static inline int quic_token_validate(struct quic_rx_packet *pkt,
 	goto leave;
 }
 
-/* Find the associated connection to the packet <pkt> or create a new one if
+/* Listener only function.
+ *
+ * Find the associated connection to the packet <pkt> or create a new one if
  * this is an Initial packet. <dgram> is the datagram containing the packet and
  * <l> is the listener instance on which it was received.
  *
@@ -2112,7 +2114,8 @@ static int quic_rx_pkt_parse(struct quic_conn *qc, struct quic_rx_packet *pkt,
 	return 0;
 
  drop:
-	HA_ATOMIC_INC(&prx_counters->dropped_pkt);
+	if (prx_counters)
+		HA_ATOMIC_INC(&prx_counters->dropped_pkt);
  drop_silent:
 	if (!pkt->len)
 		pkt->len = end - beg;
@@ -2308,6 +2311,9 @@ static void qc_rx_pkt_handle(struct quic_conn *qc, struct quic_rx_packet *pkt,
  * function will thus retrieve the connection from the CID tree or allocate a
  * new one if possible. <li> is the listener attached to the receiver.
  *
+ * Note that for a QUIC backend, <from_qc> is never NULL. <o> is never NULL
+ * for a QUIC frontend.
+ *
  * Returns 0 on success else non-zero. If an error happens, some packets from
  * the datagram may not have been parsed.
  */

src/quic_sock.c

@@ -87,7 +87,7 @@ int quic_sock_get_dst(struct connection *conn, struct sockaddr *addr, socklen_t
 		memcpy(addr, &qc->peer_addr, len);
 	} else {
 		struct sockaddr_storage *from;
-		struct listener *l = objt_listener(qc->target);
+		struct listener *l = qc->li;
 
 		/* Return listener address if IP_PKTINFO or friends are not
 		 * supported by the socket.
@@ -701,7 +701,7 @@ static int qc_may_use_saddr(struct quic_conn *qc)
 	 * possible. This is not useful if the listening socket is bound to
 	 * a specific address. It is even prohibited on FreeBSD.
 	 */
-	return (!is_addr(&__objt_listener(qc->target)->rx.addr) &&
+	return (!is_addr(&qc->li->rx.addr) &&
 	        is_addr(&qc->local_addr));
 }
 
@@ -839,7 +839,7 @@ int qc_rcv_buf(struct quic_conn *qc)
 	struct buffer buf = BUF_NULL;
 	unsigned char *dgram_buf;
 	ssize_t ret = 0;
-	struct listener *l = objt_listener(qc->target);
+	struct listener *l = qc->li;
 
 	/* Do not call this if quic-conn FD is uninitialized. */
 	BUG_ON(qc->fd < 0);
@@ -948,7 +948,8 @@ int qc_rcv_buf(struct quic_conn *qc)
 			continue;
 		}
 
-		quic_dgram_parse(new_dgram, qc, qc->target);
+		quic_dgram_parse(new_dgram, qc, l ? &l->obj_type :
+		                 (qc->conn ? &__objt_server(qc->conn->target)->obj_type : NULL));
 		/* A datagram must always be consumed after quic_parse_dgram(). */
 		BUG_ON(new_dgram->buf);
 	} while (ret > 0);
@@ -975,7 +976,7 @@ int qc_rcv_buf(struct quic_conn *qc)
 void qc_alloc_fd(struct quic_conn *qc, const struct sockaddr_storage *src,
                  const struct sockaddr_storage *dst)
 {
-	struct listener *l = __objt_listener(qc->target);
+	struct listener *l = qc->li;
 	struct bind_conf *bc = l->bind_conf;
 	struct proxy *p = bc->frontend;
 	int fd = -1;
@@ -1083,7 +1084,7 @@ struct quic_accept_queue *quic_accept_queues;
 void quic_accept_push_qc(struct quic_conn *qc)
 {
 	struct quic_accept_queue *queue = &quic_accept_queues[tid];
-	struct listener *l = __objt_listener(qc->target);
+	struct listener *l = qc->li;
 	struct li_per_thread *lthr = &l->per_thr[ti->ltid];
 
 	/* A connection must only be accepted once per instance. */

src/quic_ssl.c

@@ -938,7 +938,7 @@ int qc_ssl_do_hanshake(struct quic_conn *qc, struct ssl_sock_ctx *ctx)
 		 * handshake level CRYPTO data which are validated by the TLS stack.
 		 */
 		if (!qc_is_back(qc)) {
-			if (__objt_listener(qc->target)->bind_conf->ssl_conf.early_data &&
+			if (qc->li->bind_conf->ssl_conf.early_data &&
 				(!qc->ael || !qc->ael->tls_ctx.rx.secret)) {
 				TRACE_PROTO("SSL handshake in progress",
 				            QUIC_EV_CONN_IO_CB, qc, &state, &ssl_err);
@@ -982,7 +982,7 @@ int qc_ssl_do_hanshake(struct quic_conn *qc, struct ssl_sock_ctx *ctx)
 
 		qc->flags |= QUIC_FL_CONN_NEED_POST_HANDSHAKE_FRMS;
 		if (!qc_is_back(qc)) {
-			struct listener *l = __objt_listener(qc->target);
+			struct listener *l = qc->li;
 			/* I/O callback switch */
 			qc->wait_event.tasklet->process = quic_conn_app_io_cb;
 			qc->state = QUIC_HS_ST_CONFIRMED;
@@ -1268,7 +1268,7 @@ int qc_alloc_ssl_sock_ctx(struct quic_conn *qc, struct connection *conn)
 	ctx->qc = qc;
 
 	if (!qc_is_back(qc)) {
-		struct bind_conf *bc = __objt_listener(qc->target)->bind_conf;
+		struct bind_conf *bc = qc->li->bind_conf;
 
 		if (qc_ssl_sess_init(qc, bc->initial_ctx, &ctx->ssl, NULL, 1) == -1)
 		        goto err;

src/quic_tx.c

@@ -333,7 +333,7 @@ static int qc_send_ppkts(struct buffer *buf, struct ssl_sock_ctx *ctx)
 
 					/* Permanently disable UDP GSO for future conns which use current listener/server instance. */
 					if (!qc_is_back(qc)) {
-						struct listener *l = __objt_listener(qc->target);
+						struct listener *l = qc->li;
 						TRACE_ERROR("mark listener UDP GSO as unsupported", QUIC_EV_CONN_SPPKTS, qc, first_pkt);
 						HA_ATOMIC_OR(&l->flags, LI_F_UDP_GSO_NOTSUPP);
 					}

src/ssl_clienthello.c

@@ -174,7 +174,7 @@ int ssl_sock_switchctx_cbk(SSL *ssl, int *al, void *arg)
 		s = __objt_listener(conn->target)->bind_conf;
 #ifdef USE_QUIC
 	else if (qc)
-		s = __objt_listener(qc->target)->bind_conf;
+		s = qc->li->bind_conf;
 #endif /* USE_QUIC */
 
 	if (!s) {

src/ssl_ocsp.c

@@ -132,7 +132,7 @@ int ssl_sock_ocsp_stapling_cbk(SSL *ssl, void *arg)
 		struct quic_conn *qc = SSL_get_ex_data(ssl, ssl_qc_app_data_index);
 
 		/* null if not a listener */
-		li = objt_listener(qc->target);
+		li = qc->li;
 	}
 #endif
 

src/ssl_sock.c

@@ -1135,7 +1135,7 @@ static int ssl_tlsext_ticket_key_cb(SSL *s, unsigned char key_name[16], unsigned
 		ref  = __objt_listener(conn->target)->bind_conf->keys_ref;
 #ifdef USE_QUIC
 	else if (qc)
-		ref =  __objt_listener(qc->target)->bind_conf->keys_ref;
+		ref =  qc->li->bind_conf->keys_ref;
 #endif
 
 	if (!ref) {
@@ -1691,7 +1691,7 @@ int ssl_sock_bind_verifycbk(int ok, X509_STORE_CTX *x_store)
 	else {
 		qc = SSL_get_ex_data(ssl, ssl_qc_app_data_index);
 		BUG_ON(!qc); /* Must never happen */
-		bind_conf = __objt_listener(qc->target)->bind_conf;
+		bind_conf = qc->li->bind_conf;
 		ctx = qc->xprt_ctx;
 	}
 #endif