ipvs: Remove {Enter,Leave}Function

Remove EnterFunction and LeaveFunction.

These debugging macros seem well past their use-by date.  And seem to
have little value these days. Removing them allows some trivial cleanup
of some exit paths for some functions. These are also included in this
patch. There is likely scope for further cleanup of both debugging and
unwind paths. But let's leave that for another day.

Only intended to change debug output, and only when CONFIG_IP_VS_DEBUG
is enabled. Compile tested only.
Signed-off-by: Simon Horman <horms@kernel.org>
Reviewed-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

include/net/ip_vs.h

@@ -265,26 +265,6 @@ static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
 			pr_err(msg, ##__VA_ARGS__);			\
 	} while (0)
 
-#ifdef CONFIG_IP_VS_DEBUG
-#define EnterFunction(level)						\
-	do {								\
-		if (level <= ip_vs_get_debug_level())			\
-			printk(KERN_DEBUG				\
-			       pr_fmt("Enter: %s, %s line %i\n"),	\
-			       __func__, __FILE__, __LINE__);		\
-	} while (0)
-#define LeaveFunction(level)						\
-	do {								\
-		if (level <= ip_vs_get_debug_level())			\
-			printk(KERN_DEBUG				\
-			       pr_fmt("Leave: %s, %s line %i\n"),	\
-			       __func__, __FILE__, __LINE__);		\
-	} while (0)
-#else
-#define EnterFunction(level)   do {} while (0)
-#define LeaveFunction(level)   do {} while (0)
-#endif
-
 /* The port number of FTP service (in network order). */
 #define FTPPORT  cpu_to_be16(21)
 #define FTPDATA  cpu_to_be16(20)

net/netfilter/ipvs/ip_vs_core.c

@@ -1140,7 +1140,6 @@ struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
 	__be16 vport;
 	unsigned int flags;
 
-	EnterFunction(12);
 	vaddr = &svc->addr;
 	vport = svc->port;
 	daddr = &iph->saddr;
@@ -1208,7 +1207,6 @@ struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
 		      IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport),
 		      IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport),
 		      cp->flags, refcount_read(&cp->refcnt));
-	LeaveFunction(12);
 	return cp;
 }
 
@@ -1316,13 +1314,11 @@ handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
 		ip_vs_update_conntrack(skb, cp, 0);
 	ip_vs_conn_put(cp);
 
-	LeaveFunction(11);
 	return NF_ACCEPT;
 
 drop:
 	ip_vs_conn_put(cp);
 	kfree_skb(skb);
-	LeaveFunction(11);
 	return NF_STOLEN;
 }
 
@@ -1341,8 +1337,6 @@ ip_vs_out_hook(void *priv, struct sk_buff *skb, const struct nf_hook_state *stat
 	int af = state->pf;
 	struct sock *sk;
 
-	EnterFunction(11);
-
 	/* Already marked as IPVS request or reply? */
 	if (skb->ipvs_property)
 		return NF_ACCEPT;
@@ -2365,7 +2359,6 @@ static void __net_exit __ip_vs_dev_cleanup_batch(struct list_head *net_list)
 	struct netns_ipvs *ipvs;
 	struct net *net;
 
-	EnterFunction(2);
 	list_for_each_entry(net, net_list, exit_list) {
 		ipvs = net_ipvs(net);
 		ip_vs_unregister_hooks(ipvs, AF_INET);
@@ -2374,7 +2367,6 @@ static void __net_exit __ip_vs_dev_cleanup_batch(struct list_head *net_list)
 		smp_wmb();
 		ip_vs_sync_net_cleanup(ipvs);
 	}
-	LeaveFunction(2);
 }
 
 static struct pernet_operations ipvs_core_ops = {

net/netfilter/ipvs/ip_vs_ctl.c

@@ -1061,8 +1061,6 @@ ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
 	unsigned int atype;
 	int ret;
 
-	EnterFunction(2);
-
 #ifdef CONFIG_IP_VS_IPV6
 	if (udest->af == AF_INET6) {
 		atype = ipv6_addr_type(&udest->addr.in6);
@@ -1111,7 +1109,6 @@ ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
 	spin_lock_init(&dest->dst_lock);
 	__ip_vs_update_dest(svc, dest, udest, 1);
 
-	LeaveFunction(2);
 	return 0;
 
 err_stats:
@@ -1134,8 +1131,6 @@ ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
 	__be16 dport = udest->port;
 	int ret;
 
-	EnterFunction(2);
-
 	if (udest->weight < 0) {
 		pr_err("%s(): server weight less than zero\n", __func__);
 		return -ERANGE;
@@ -1183,7 +1178,7 @@ ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
 
 		ret = ip_vs_start_estimator(svc->ipvs, &dest->stats);
 		if (ret < 0)
-			goto err;
+			return ret;
 		__ip_vs_update_dest(svc, dest, udest, 1);
 	} else {
 		/*
@@ -1192,9 +1187,6 @@ ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
 		ret = ip_vs_new_dest(svc, udest);
 	}
 
-err:
-	LeaveFunction(2);
-
 	return ret;
 }
 
@@ -1209,8 +1201,6 @@ ip_vs_edit_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
 	union nf_inet_addr daddr;
 	__be16 dport = udest->port;
 
-	EnterFunction(2);
-
 	if (udest->weight < 0) {
 		pr_err("%s(): server weight less than zero\n", __func__);
 		return -ERANGE;
@@ -1242,7 +1232,6 @@ ip_vs_edit_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
 	}
 
 	__ip_vs_update_dest(svc, dest, udest, 0);
-	LeaveFunction(2);
 
 	return 0;
 }
@@ -1317,8 +1306,6 @@ ip_vs_del_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
 	struct ip_vs_dest *dest;
 	__be16 dport = udest->port;
 
-	EnterFunction(2);
-
 	/* We use function that requires RCU lock */
 	rcu_read_lock();
 	dest = ip_vs_lookup_dest(svc, udest->af, &udest->addr, dport);
@@ -1339,8 +1326,6 @@ ip_vs_del_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
 	 */
 	__ip_vs_del_dest(svc->ipvs, dest, false);
 
-	LeaveFunction(2);
-
 	return 0;
 }
 
@@ -1746,7 +1731,6 @@ void ip_vs_service_nets_cleanup(struct list_head *net_list)
 	struct netns_ipvs *ipvs;
 	struct net *net;
 
-	EnterFunction(2);
 	/* Check for "full" addressed entries */
 	mutex_lock(&__ip_vs_mutex);
 	list_for_each_entry(net, net_list, exit_list) {
@@ -1754,7 +1738,6 @@ void ip_vs_service_nets_cleanup(struct list_head *net_list)
 		ip_vs_flush(ipvs, true);
 	}
 	mutex_unlock(&__ip_vs_mutex);
-	LeaveFunction(2);
 }
 
 /* Put all references for device (dst_cache) */
@@ -1792,7 +1775,6 @@ static int ip_vs_dst_event(struct notifier_block *this, unsigned long event,
 	if (event != NETDEV_DOWN || !ipvs)
 		return NOTIFY_DONE;
 	IP_VS_DBG(3, "%s() dev=%s\n", __func__, dev->name);
-	EnterFunction(2);
 	mutex_lock(&__ip_vs_mutex);
 	for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
 		hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
@@ -1821,7 +1803,6 @@ static int ip_vs_dst_event(struct notifier_block *this, unsigned long event,
 	}
 	spin_unlock_bh(&ipvs->dest_trash_lock);
 	mutex_unlock(&__ip_vs_mutex);
-	LeaveFunction(2);
 	return NOTIFY_DONE;
 }
 
@@ -4537,8 +4518,6 @@ int __init ip_vs_control_init(void)
 	int idx;
 	int ret;
 
-	EnterFunction(2);
-
 	/* Initialize svc_table, ip_vs_svc_fwm_table */
 	for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
 		INIT_HLIST_HEAD(&ip_vs_svc_table[idx]);
@@ -4551,15 +4530,12 @@ int __init ip_vs_control_init(void)
 	if (ret < 0)
 		return ret;
 
-	LeaveFunction(2);
 	return 0;
 }
 
 
 void ip_vs_control_cleanup(void)
 {
-	EnterFunction(2);
 	unregister_netdevice_notifier(&ip_vs_dst_notifier);
 	/* relying on common rcu_barrier() in ip_vs_cleanup() */
-	LeaveFunction(2);
 }

net/netfilter/ipvs/ip_vs_sync.c

@@ -1582,13 +1582,11 @@ ip_vs_send_async(struct socket *sock, const char *buffer, const size_t length)
 	struct kvec	iov;
 	int		len;
 
-	EnterFunction(7);
 	iov.iov_base     = (void *)buffer;
 	iov.iov_len      = length;
 
 	len = kernel_sendmsg(sock, &msg, &iov, 1, (size_t)(length));
 
-	LeaveFunction(7);
 	return len;
 }
 
@@ -1614,15 +1612,12 @@ ip_vs_receive(struct socket *sock, char *buffer, const size_t buflen)
 	struct kvec		iov = {buffer, buflen};
 	int			len;
 
-	EnterFunction(7);
-
 	/* Receive a packet */
 	iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, buflen);
 	len = sock_recvmsg(sock, &msg, MSG_DONTWAIT);
 	if (len < 0)
 		return len;
 
-	LeaveFunction(7);
 	return len;
 }
 

net/netfilter/ipvs/ip_vs_xmit.c

@@ -706,8 +706,6 @@ ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 {
 	struct iphdr  *iph = ip_hdr(skb);
 
-	EnterFunction(10);
-
 	if (__ip_vs_get_out_rt(cp->ipvs, cp->af, skb, NULL, iph->daddr,
 			       IP_VS_RT_MODE_NON_LOCAL, NULL, ipvsh) < 0)
 		goto tx_error;
@@ -719,12 +717,10 @@ ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 
 	ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 0);
 
-	LeaveFunction(10);
 	return NF_STOLEN;
 
  tx_error:
 	kfree_skb(skb);
-	LeaveFunction(10);
 	return NF_STOLEN;
 }
 
@@ -735,8 +731,6 @@ ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
 {
 	struct ipv6hdr *iph = ipv6_hdr(skb);
 
-	EnterFunction(10);
-
 	if (__ip_vs_get_out_rt_v6(cp->ipvs, cp->af, skb, NULL,
 				  &iph->daddr, NULL,
 				  ipvsh, 0, IP_VS_RT_MODE_NON_LOCAL) < 0)
@@ -747,12 +741,10 @@ ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
 
 	ip_vs_send_or_cont(NFPROTO_IPV6, skb, cp, 0);
 
-	LeaveFunction(10);
 	return NF_STOLEN;
 
  tx_error:
 	kfree_skb(skb);
-	LeaveFunction(10);
 	return NF_STOLEN;
 }
 #endif
@@ -768,8 +760,6 @@ ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 	struct rtable *rt;		/* Route to the other host */
 	int local, rc, was_input;
 
-	EnterFunction(10);
-
 	/* check if it is a connection of no-client-port */
 	if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT)) {
 		__be16 _pt, *p;
@@ -839,12 +829,10 @@ ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 
 	rc = ip_vs_nat_send_or_cont(NFPROTO_IPV4, skb, cp, local);
 
-	LeaveFunction(10);
 	return rc;
 
   tx_error:
 	kfree_skb(skb);
-	LeaveFunction(10);
 	return NF_STOLEN;
 }
 
@@ -856,8 +844,6 @@ ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
 	struct rt6_info *rt;		/* Route to the other host */
 	int local, rc;
 
-	EnterFunction(10);
-
 	/* check if it is a connection of no-client-port */
 	if (unlikely(cp->flags & IP_VS_CONN_F_NO_CPORT && !ipvsh->fragoffs)) {
 		__be16 _pt, *p;
@@ -927,11 +913,9 @@ ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
 
 	rc = ip_vs_nat_send_or_cont(NFPROTO_IPV6, skb, cp, local);
 
-	LeaveFunction(10);
 	return rc;
 
 tx_error:
-	LeaveFunction(10);
 	kfree_skb(skb);
 	return NF_STOLEN;
 }
@@ -1149,8 +1133,6 @@ ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 	int tun_type, gso_type;
 	int tun_flags;
 
-	EnterFunction(10);
-
 	local = __ip_vs_get_out_rt(ipvs, cp->af, skb, cp->dest, cp->daddr.ip,
 				   IP_VS_RT_MODE_LOCAL |
 				   IP_VS_RT_MODE_NON_LOCAL |
@@ -1199,7 +1181,7 @@ ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 					 &next_protocol, NULL, &dsfield,
 					 &ttl, dfp);
 	if (IS_ERR(skb))
-		goto tx_error;
+		return NF_STOLEN;
 
 	gso_type = __tun_gso_type_mask(AF_INET, cp->af);
 	if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GUE) {
@@ -1267,14 +1249,10 @@ ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 	else if (ret == NF_DROP)
 		kfree_skb(skb);
 
-	LeaveFunction(10);
-
 	return NF_STOLEN;
 
   tx_error:
-	if (!IS_ERR(skb))
-		kfree_skb(skb);
-	LeaveFunction(10);
+	kfree_skb(skb);
 	return NF_STOLEN;
 }
 
@@ -1298,8 +1276,6 @@ ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
 	int tun_type, gso_type;
 	int tun_flags;
 
-	EnterFunction(10);
-
 	local = __ip_vs_get_out_rt_v6(ipvs, cp->af, skb, cp->dest,
 				      &cp->daddr.in6,
 				      &saddr, ipvsh, 1,
@@ -1347,7 +1323,7 @@ ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
 					 &next_protocol, &payload_len,
 					 &dsfield, &ttl, NULL);
 	if (IS_ERR(skb))
-		goto tx_error;
+		return NF_STOLEN;
 
 	gso_type = __tun_gso_type_mask(AF_INET6, cp->af);
 	if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GUE) {
@@ -1414,14 +1390,10 @@ ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
 	else if (ret == NF_DROP)
 		kfree_skb(skb);
 
-	LeaveFunction(10);
-
 	return NF_STOLEN;
 
 tx_error:
-	if (!IS_ERR(skb))
-		kfree_skb(skb);
-	LeaveFunction(10);
+	kfree_skb(skb);
 	return NF_STOLEN;
 }
 #endif
@@ -1437,8 +1409,6 @@ ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 {
 	int local;
 
-	EnterFunction(10);
-
 	local = __ip_vs_get_out_rt(cp->ipvs, cp->af, skb, cp->dest, cp->daddr.ip,
 				   IP_VS_RT_MODE_LOCAL |
 				   IP_VS_RT_MODE_NON_LOCAL |
@@ -1455,12 +1425,10 @@ ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 
 	ip_vs_send_or_cont(NFPROTO_IPV4, skb, cp, 0);
 
-	LeaveFunction(10);
 	return NF_STOLEN;
 
   tx_error:
 	kfree_skb(skb);
-	LeaveFunction(10);
 	return NF_STOLEN;
 }
 
@@ -1471,8 +1439,6 @@ ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
 {
 	int local;
 
-	EnterFunction(10);
-
 	local = __ip_vs_get_out_rt_v6(cp->ipvs, cp->af, skb, cp->dest,
 				      &cp->daddr.in6,
 				      NULL, ipvsh, 0,
@@ -1489,12 +1455,10 @@ ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
 
 	ip_vs_send_or_cont(NFPROTO_IPV6, skb, cp, 0);
 
-	LeaveFunction(10);
 	return NF_STOLEN;
 
 tx_error:
 	kfree_skb(skb);
-	LeaveFunction(10);
 	return NF_STOLEN;
 }
 #endif
@@ -1514,8 +1478,6 @@ ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 	int local;
 	int rt_mode, was_input;
 
-	EnterFunction(10);
-
 	/* The ICMP packet for VS/TUN, VS/DR and LOCALNODE will be
 	   forwarded directly here, because there is no need to
 	   translate address/port back */
@@ -1526,7 +1488,7 @@ ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 			rc = NF_ACCEPT;
 		/* do not touch skb anymore */
 		atomic_inc(&cp->in_pkts);
-		goto out;
+		return rc;
 	}
 
 	/*
@@ -1582,14 +1544,11 @@ ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 	/* Another hack: avoid icmp_send in ip_fragment */
 	skb->ignore_df = 1;
 
-	rc = ip_vs_nat_send_or_cont(NFPROTO_IPV4, skb, cp, local);
-	goto out;
+	return ip_vs_nat_send_or_cont(NFPROTO_IPV4, skb, cp, local);
 
   tx_error:
 	kfree_skb(skb);
 	rc = NF_STOLEN;
-  out:
-	LeaveFunction(10);
 	return rc;
 }
 
@@ -1604,8 +1563,6 @@ ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
 	int local;
 	int rt_mode;
 
-	EnterFunction(10);
-
 	/* The ICMP packet for VS/TUN, VS/DR and LOCALNODE will be
 	   forwarded directly here, because there is no need to
 	   translate address/port back */
@@ -1616,7 +1573,7 @@ ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
 			rc = NF_ACCEPT;
 		/* do not touch skb anymore */
 		atomic_inc(&cp->in_pkts);
-		goto out;
+		return rc;
 	}
 
 	/*
@@ -1671,14 +1628,11 @@ ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
 	/* Another hack: avoid icmp_send in ip_fragment */
 	skb->ignore_df = 1;
 
-	rc = ip_vs_nat_send_or_cont(NFPROTO_IPV6, skb, cp, local);
-	goto out;
+	return ip_vs_nat_send_or_cont(NFPROTO_IPV6, skb, cp, local);
 
 tx_error:
 	kfree_skb(skb);
 	rc = NF_STOLEN;
-out:
-	LeaveFunction(10);
 	return rc;
 }
 #endif