Merge branch 'tipc-cleanups-and-simplifications'

Jon Maloy says:

====================
tipc: cleanups and simplifications

We do a number of cleanups and simplifications, especially regarding
call signatures in the binding table. This makes the code easier to
understand and serves as preparation for upcoming functional additions.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/addr.c

@@ -3,6 +3,7 @@
  *
  * Copyright (c) 2000-2006, 2018, Ericsson AB
  * Copyright (c) 2004-2005, 2010-2011, Wind River Systems
+ * Copyright (c) 2020-2021, Red Hat Inc
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without

net/tipc/addr.h

@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2000-2006, 2018, Ericsson AB
  * Copyright (c) 2004-2005, Wind River Systems
- * Copyright (c) 2020, Red Hat Inc
+ * Copyright (c) 2020-2021, Red Hat Inc
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -44,6 +44,50 @@
 #include <net/netns/generic.h>
 #include "core.h"
 
+/* Struct tipc_uaddr: internal version of struct sockaddr_tipc.
+ * Must be kept aligned both regarding field positions and size.
+ */
+struct tipc_uaddr {
+	unsigned short family;
+	unsigned char addrtype;
+	signed char scope;
+	union {
+		struct {
+			struct tipc_service_addr sa;
+			u32 lookup_node;
+		};
+		struct tipc_service_range sr;
+		struct tipc_socket_addr sk;
+	};
+};
+
+static inline void tipc_uaddr(struct tipc_uaddr *ua, u32 atype, u32 scope,
+			      u32 type, u32 lower, u32 upper)
+{
+	ua->family = AF_TIPC;
+	ua->addrtype = atype;
+	ua->scope = scope;
+	ua->sr.type = type;
+	ua->sr.lower = lower;
+	ua->sr.upper = upper;
+}
+
+static inline bool tipc_uaddr_valid(struct tipc_uaddr *ua, int len)
+{
+	u32 atype;
+
+	if (len < sizeof(struct sockaddr_tipc))
+		return false;
+	atype = ua->addrtype;
+	if (ua->family != AF_TIPC)
+		return false;
+	if (atype == TIPC_SERVICE_ADDR || atype == TIPC_SOCKET_ADDR)
+		return true;
+	if (atype == TIPC_SERVICE_RANGE)
+		return ua->sr.upper >= ua->sr.lower;
+	return false;
+}
+
 static inline u32 tipc_own_addr(struct net *net)
 {
 	return tipc_net(net)->node_addr;

net/tipc/msg.c

@@ -707,8 +707,11 @@ bool tipc_msg_skb_clone(struct sk_buff_head *msg, struct sk_buff_head *cpy)
 bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err)
 {
 	struct tipc_msg *msg = buf_msg(skb);
-	u32 dport, dnode;
-	u32 onode = tipc_own_addr(net);
+	u32 scope = msg_lookup_scope(msg);
+	u32 self = tipc_own_addr(net);
+	u32 inst = msg_nameinst(msg);
+	struct tipc_socket_addr sk;
+	struct tipc_uaddr ua;
 
 	if (!msg_isdata(msg))
 		return false;
@@ -722,16 +725,16 @@ bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err)
 	msg = buf_msg(skb);
 	if (msg_reroute_cnt(msg))
 		return false;
-	dnode = tipc_scope2node(net, msg_lookup_scope(msg));
-	dport = tipc_nametbl_translate(net, msg_nametype(msg),
-				       msg_nameinst(msg), &dnode);
-	if (!dport)
+	tipc_uaddr(&ua, TIPC_SERVICE_RANGE, scope,
+		   msg_nametype(msg), inst, inst);
+	sk.node = tipc_scope2node(net, scope);
+	if (!tipc_nametbl_lookup_anycast(net, &ua, &sk))
 		return false;
 	msg_incr_reroute_cnt(msg);
-	if (dnode != onode)
-		msg_set_prevnode(msg, onode);
-	msg_set_destnode(msg, dnode);
-	msg_set_destport(msg, dport);
+	if (sk.node != self)
+		msg_set_prevnode(msg, self);
+	msg_set_destnode(msg, sk.node);
+	msg_set_destport(msg, sk.ref);
 	*err = TIPC_OK;
 
 	return true;

net/tipc/name_distr.c

 /*
  * net/tipc/name_distr.c: TIPC name distribution code
  *
- * Copyright (c) 2000-2006, 2014, Ericsson AB
+ * Copyright (c) 2000-2006, 2014-2019, Ericsson AB
  * Copyright (c) 2005, 2010-2011, Wind River Systems
+ * Copyright (c) 2020-2021, Red Hat Inc
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -55,10 +56,10 @@ struct distr_queue_item {
  */
 static void publ_to_item(struct distr_item *i, struct publication *p)
 {
-	i->type = htonl(p->type);
-	i->lower = htonl(p->lower);
-	i->upper = htonl(p->upper);
-	i->port = htonl(p->port);
+	i->type = htonl(p->sr.type);
+	i->lower = htonl(p->sr.lower);
+	i->upper = htonl(p->sr.upper);
+	i->port = htonl(p->sk.ref);
 	i->key = htonl(p->key);
 }
 
@@ -90,20 +91,20 @@ static struct sk_buff *named_prepare_buf(struct net *net, u32 type, u32 size,
 /**
  * tipc_named_publish - tell other nodes about a new publication by this node
  * @net: the associated network namespace
- * @publ: the new publication
+ * @p: the new publication
  */
-struct sk_buff *tipc_named_publish(struct net *net, struct publication *publ)
+struct sk_buff *tipc_named_publish(struct net *net, struct publication *p)
 {
 	struct name_table *nt = tipc_name_table(net);
 	struct distr_item *item;
 	struct sk_buff *skb;
 
-	if (publ->scope == TIPC_NODE_SCOPE) {
-		list_add_tail_rcu(&publ->binding_node, &nt->node_scope);
+	if (p->scope == TIPC_NODE_SCOPE) {
+		list_add_tail_rcu(&p->binding_node, &nt->node_scope);
 		return NULL;
 	}
 	write_lock_bh(&nt->cluster_scope_lock);
-	list_add_tail(&publ->binding_node, &nt->cluster_scope);
+	list_add_tail(&p->binding_node, &nt->cluster_scope);
 	write_unlock_bh(&nt->cluster_scope_lock);
 	skb = named_prepare_buf(net, PUBLICATION, ITEM_SIZE, 0);
 	if (!skb) {
@@ -113,25 +114,25 @@ struct sk_buff *tipc_named_publish(struct net *net, struct publication *publ)
 	msg_set_named_seqno(buf_msg(skb), nt->snd_nxt++);
 	msg_set_non_legacy(buf_msg(skb));
 	item = (struct distr_item *)msg_data(buf_msg(skb));
-	publ_to_item(item, publ);
+	publ_to_item(item, p);
 	return skb;
 }
 
 /**
  * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node
  * @net: the associated network namespace
- * @publ: the withdrawn publication
+ * @p: the withdrawn publication
  */
-struct sk_buff *tipc_named_withdraw(struct net *net, struct publication *publ)
+struct sk_buff *tipc_named_withdraw(struct net *net, struct publication *p)
 {
 	struct name_table *nt = tipc_name_table(net);
 	struct distr_item *item;
 	struct sk_buff *skb;
 
 	write_lock_bh(&nt->cluster_scope_lock);
-	list_del(&publ->binding_node);
+	list_del(&p->binding_node);
 	write_unlock_bh(&nt->cluster_scope_lock);
-	if (publ->scope == TIPC_NODE_SCOPE)
+	if (p->scope == TIPC_NODE_SCOPE)
 		return NULL;
 
 	skb = named_prepare_buf(net, WITHDRAWAL, ITEM_SIZE, 0);
@@ -142,7 +143,7 @@ struct sk_buff *tipc_named_withdraw(struct net *net, struct publication *publ)
 	msg_set_named_seqno(buf_msg(skb), nt->snd_nxt++);
 	msg_set_non_legacy(buf_msg(skb));
 	item = (struct distr_item *)msg_data(buf_msg(skb));
-	publ_to_item(item, publ);
+	publ_to_item(item, p);
 	return skb;
 }
 
@@ -233,33 +234,27 @@ void tipc_named_node_up(struct net *net, u32 dnode, u16 capabilities)
 /**
  * tipc_publ_purge - remove publication associated with a failed node
  * @net: the associated network namespace
- * @publ: the publication to remove
+ * @p: the publication to remove
  * @addr: failed node's address
  *
  * Invoked for each publication issued by a newly failed node.
  * Removes publication structure from name table & deletes it.
  */
-static void tipc_publ_purge(struct net *net, struct publication *publ, u32 addr)
+static void tipc_publ_purge(struct net *net, struct publication *p, u32 addr)
 {
 	struct tipc_net *tn = tipc_net(net);
-	struct publication *p;
+	struct publication *_p;
+	struct tipc_uaddr ua;
 
+	tipc_uaddr(&ua, TIPC_SERVICE_RANGE, p->scope, p->sr.type,
+		   p->sr.lower, p->sr.upper);
 	spin_lock_bh(&tn->nametbl_lock);
-	p = tipc_nametbl_remove_publ(net, publ->type, publ->lower, publ->upper,
-				     publ->node, publ->key);
-	if (p)
-		tipc_node_unsubscribe(net, &p->binding_node, addr);
+	_p = tipc_nametbl_remove_publ(net, &ua, &p->sk, p->key);
+	if (_p)
+		tipc_node_unsubscribe(net, &_p->binding_node, addr);
 	spin_unlock_bh(&tn->nametbl_lock);
-
-	if (p != publ) {
-		pr_err("Unable to remove publication from failed node\n"
-		       " (type=%u, lower=%u, node=0x%x, port=%u, key=%u)\n",
-		       publ->type, publ->lower, publ->node, publ->port,
-		       publ->key);
-	}
-
-	if (p)
-		kfree_rcu(p, rcu);
+	if (_p)
+		kfree_rcu(_p, rcu);
 }
 
 void tipc_publ_notify(struct net *net, struct list_head *nsub_list,
@@ -293,30 +288,30 @@ static bool tipc_update_nametbl(struct net *net, struct distr_item *i,
 				u32 node, u32 dtype)
 {
 	struct publication *p = NULL;
-	u32 lower = ntohl(i->lower);
-	u32 upper = ntohl(i->upper);
-	u32 type = ntohl(i->type);
-	u32 port = ntohl(i->port);
+	struct tipc_socket_addr sk;
+	struct tipc_uaddr ua;
 	u32 key = ntohl(i->key);
 
+	tipc_uaddr(&ua, TIPC_SERVICE_RANGE, TIPC_CLUSTER_SCOPE,
+		   ntohl(i->type), ntohl(i->lower), ntohl(i->upper));
+	sk.ref = ntohl(i->port);
+	sk.node = node;
+
 	if (dtype == PUBLICATION) {
-		p = tipc_nametbl_insert_publ(net, type, lower, upper,
-					     TIPC_CLUSTER_SCOPE, node,
-					     port, key);
+		p = tipc_nametbl_insert_publ(net, &ua, &sk, key);
 		if (p) {
 			tipc_node_subscribe(net, &p->binding_node, node);
 			return true;
 		}
 	} else if (dtype == WITHDRAWAL) {
-		p = tipc_nametbl_remove_publ(net, type, lower,
-					     upper, node, key);
+		p = tipc_nametbl_remove_publ(net, &ua, &sk, key);
 		if (p) {
 			tipc_node_unsubscribe(net, &p->binding_node, node);
 			kfree_rcu(p, rcu);
 			return true;
 		}
-		pr_warn_ratelimited("Failed to remove binding %u,%u from %x\n",
-				    type, lower, node);
+		pr_warn_ratelimited("Failed to remove binding %u,%u from %u\n",
+				    ua.sr.type, ua.sr.lower, node);
 	} else {
 		pr_warn("Unrecognized name table message received\n");
 	}
@@ -410,15 +405,15 @@ void tipc_named_reinit(struct net *net)
 {
 	struct name_table *nt = tipc_name_table(net);
 	struct tipc_net *tn = tipc_net(net);
-	struct publication *publ;
+	struct publication *p;
 	u32 self = tipc_own_addr(net);
 
 	spin_lock_bh(&tn->nametbl_lock);
 
-	list_for_each_entry_rcu(publ, &nt->node_scope, binding_node)
-		publ->node = self;
-	list_for_each_entry_rcu(publ, &nt->cluster_scope, binding_node)
-		publ->node = self;
+	list_for_each_entry_rcu(p, &nt->node_scope, binding_node)
+		p->sk.node = self;
+	list_for_each_entry_rcu(p, &nt->cluster_scope, binding_node)
+		p->sk.node = self;
 	nt->rc_dests = 0;
 	spin_unlock_bh(&tn->nametbl_lock);
 }

net/tipc/name_table.h

@@ -3,6 +3,7 @@
  *
  * Copyright (c) 2000-2006, 2014-2018, Ericsson AB
  * Copyright (c) 2004-2005, 2010-2011, Wind River Systems
+ * Copyright (c) 2020-2021, Red Hat Inc
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -41,6 +42,7 @@ struct tipc_subscription;
 struct tipc_plist;
 struct tipc_nlist;
 struct tipc_group;
+struct tipc_uaddr;
 
 /*
  * TIPC name types reserved for internal TIPC use (both current and planned)
@@ -50,13 +52,10 @@ struct tipc_group;
 #define TIPC_NAMETBL_SIZE	1024	/* must be a power of 2 */
 
 /**
- * struct publication - info about a published (name or) name sequence
- * @type: name sequence type
- * @lower: name sequence lower bound
- * @upper: name sequence upper bound
+ * struct publication - info about a published service address or range
+ * @sr: service range represented by this publication
+ * @sk: address of socket bound to this publication
  * @scope: scope of publication, TIPC_NODE_SCOPE or TIPC_CLUSTER_SCOPE
- * @node: network address of publishing socket's node
- * @port: publishing port
  * @key: publication key, unique across the cluster
  * @id: publication id
  * @binding_node: all publications from the same node which bound this one
@@ -74,12 +73,9 @@ struct tipc_group;
  * @rcu: RCU callback head used for deferred freeing
  */
 struct publication {
-	u32 type;
-	u32 lower;
-	u32 upper;
-	u32 scope;
-	u32 node;
-	u32 port;
+	struct tipc_service_range sr;
+	struct tipc_socket_addr sk;
+	u16 scope;
 	u32 key;
 	u32 id;
 	struct list_head binding_node;
@@ -114,28 +110,29 @@ struct name_table {
 };
 
 int tipc_nl_name_table_dump(struct sk_buff *skb, struct netlink_callback *cb);
-
-u32 tipc_nametbl_translate(struct net *net, u32 type, u32 instance, u32 *node);
-void tipc_nametbl_mc_lookup(struct net *net, u32 type, u32 lower, u32 upper,
-			    u32 scope, bool exact, struct list_head *dports);
+bool tipc_nametbl_lookup_anycast(struct net *net, struct tipc_uaddr *ua,
+				 struct tipc_socket_addr *sk);
+void tipc_nametbl_lookup_mcast_sockets(struct net *net, struct tipc_uaddr *ua,
+				       bool exact, struct list_head *dports);
+void tipc_nametbl_lookup_mcast_nodes(struct net *net, struct tipc_uaddr *ua,
+				     struct tipc_nlist *nodes);
+bool tipc_nametbl_lookup_group(struct net *net, struct tipc_uaddr *ua,
+			       struct list_head *dsts, int *dstcnt,
+			       u32 exclude, bool mcast);
 void tipc_nametbl_build_group(struct net *net, struct tipc_group *grp,
-			      u32 type, u32 domain);
-void tipc_nametbl_lookup_dst_nodes(struct net *net, u32 type, u32 lower,
-				   u32 upper, struct tipc_nlist *nodes);
-bool tipc_nametbl_lookup(struct net *net, u32 type, u32 instance, u32 domain,
-			 struct list_head *dsts, int *dstcnt, u32 exclude,
-			 bool all);
-struct publication *tipc_nametbl_publish(struct net *net, u32 type, u32 lower,
-					 u32 upper, u32 scope, u32 port,
-					 u32 key);
-int tipc_nametbl_withdraw(struct net *net, u32 type, u32 lower, u32 upper,
-			  u32 key);
-struct publication *tipc_nametbl_insert_publ(struct net *net, u32 type,
-					     u32 lower, u32 upper, u32 scope,
-					     u32 node, u32 ref, u32 key);
-struct publication *tipc_nametbl_remove_publ(struct net *net, u32 type,
-					     u32 lower, u32 upper,
-					     u32 node, u32 key);
+			      struct tipc_uaddr *ua);
+struct publication *tipc_nametbl_publish(struct net *net, struct tipc_uaddr *ua,
+					 struct tipc_socket_addr *sk, u32 key);
+void tipc_nametbl_withdraw(struct net *net, struct tipc_uaddr *ua,
+			   struct tipc_socket_addr *sk, u32 key);
+struct publication *tipc_nametbl_insert_publ(struct net *net,
+					     struct tipc_uaddr *ua,
+					     struct tipc_socket_addr *sk,
+					     u32 key);
+struct publication *tipc_nametbl_remove_publ(struct net *net,
+					     struct tipc_uaddr *ua,
+					     struct tipc_socket_addr *sk,
+					     u32 key);
 bool tipc_nametbl_subscribe(struct tipc_subscription *s);
 void tipc_nametbl_unsubscribe(struct tipc_subscription *s);
 int tipc_nametbl_init(struct net *net);

net/tipc/net.c

@@ -125,6 +125,11 @@ int tipc_net_init(struct net *net, u8 *node_id, u32 addr)
 static void tipc_net_finalize(struct net *net, u32 addr)
 {
 	struct tipc_net *tn = tipc_net(net);
+	struct tipc_socket_addr sk = {0, addr};
+	struct tipc_uaddr ua;
+
+	tipc_uaddr(&ua, TIPC_SERVICE_RANGE, TIPC_CLUSTER_SCOPE,
+		   TIPC_NODE_STATE, addr, addr);
 
 	if (cmpxchg(&tn->node_addr, 0, addr))
 		return;
@@ -132,8 +137,7 @@ static void tipc_net_finalize(struct net *net, u32 addr)
 	tipc_named_reinit(net);
 	tipc_sk_reinit(net);
 	tipc_mon_reinit_self(net);
-	tipc_nametbl_publish(net, TIPC_NODE_STATE, addr, addr,
-			     TIPC_CLUSTER_SCOPE, 0, addr);
+	tipc_nametbl_publish(net, &ua, &sk, addr);
 }
 
 void tipc_net_finalize_work(struct work_struct *work)

net/tipc/node.c

@@ -398,21 +398,23 @@ static void tipc_node_write_unlock_fast(struct tipc_node *n)
 static void tipc_node_write_unlock(struct tipc_node *n)
 	__releases(n->lock)
 {
+	struct tipc_socket_addr sk;
 	struct net *net = n->net;
-	u32 addr = 0;
 	u32 flags = n->action_flags;
-	u32 link_id = 0;
-	u32 bearer_id;
 	struct list_head *publ_list;
+	struct tipc_uaddr ua;
+	u32 bearer_id;
 
 	if (likely(!flags)) {
 		write_unlock_bh(&n->lock);
 		return;
 	}
 
-	addr = n->addr;
-	link_id = n->link_id;
-	bearer_id = link_id & 0xffff;
+	tipc_uaddr(&ua, TIPC_SERVICE_RANGE, TIPC_NODE_SCOPE,
+		   TIPC_LINK_STATE, n->addr, n->addr);
+	sk.ref = n->link_id;
+	sk.node = n->addr;
+	bearer_id = n->link_id & 0xffff;
 	publ_list = &n->publ_list;
 
 	n->action_flags &= ~(TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP |
@@ -421,20 +423,18 @@ static void tipc_node_write_unlock(struct tipc_node *n)
 	write_unlock_bh(&n->lock);
 
 	if (flags & TIPC_NOTIFY_NODE_DOWN)
-		tipc_publ_notify(net, publ_list, addr, n->capabilities);
+		tipc_publ_notify(net, publ_list, n->addr, n->capabilities);
 
 	if (flags & TIPC_NOTIFY_NODE_UP)
-		tipc_named_node_up(net, addr, n->capabilities);
+		tipc_named_node_up(net, n->addr, n->capabilities);
 
 	if (flags & TIPC_NOTIFY_LINK_UP) {
-		tipc_mon_peer_up(net, addr, bearer_id);
-		tipc_nametbl_publish(net, TIPC_LINK_STATE, addr, addr,
-				     TIPC_NODE_SCOPE, link_id, link_id);
+		tipc_mon_peer_up(net, n->addr, bearer_id);
+		tipc_nametbl_publish(net, &ua, &sk, n->link_id);
 	}
 	if (flags & TIPC_NOTIFY_LINK_DOWN) {
-		tipc_mon_peer_down(net, addr, bearer_id);
-		tipc_nametbl_withdraw(net, TIPC_LINK_STATE, addr,
-				      addr, link_id);
+		tipc_mon_peer_down(net, n->addr, bearer_id);
+		tipc_nametbl_withdraw(net, &ua, &sk, n->link_id);
 	}
 }
 

net/tipc/subscr.c

@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2000-2017, Ericsson AB
  * Copyright (c) 2005-2007, 2010-2013, Wind River Systems
- * Copyright (c) 2020, Red Hat Inc
+ * Copyright (c) 2020-2021, Red Hat Inc
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -40,77 +40,75 @@
 #include "subscr.h"
 
 static void tipc_sub_send_event(struct tipc_subscription *sub,
-				u32 found_lower, u32 found_upper,
-				u32 event, u32 port, u32 node)
+				struct publication *p,
+				u32 event)
 {
+	struct tipc_subscr *s = &sub->evt.s;
 	struct tipc_event *evt = &sub->evt;
 
 	if (sub->inactive)
 		return;
 	tipc_evt_write(evt, event, event);
-	tipc_evt_write(evt, found_lower, found_lower);
-	tipc_evt_write(evt, found_upper, found_upper);
-	tipc_evt_write(evt, port.ref, port);
-	tipc_evt_write(evt, port.node, node);
+	if (p) {
+		tipc_evt_write(evt, found_lower, p->sr.lower);
+		tipc_evt_write(evt, found_upper, p->sr.upper);
+		tipc_evt_write(evt, port.ref, p->sk.ref);
+		tipc_evt_write(evt, port.node, p->sk.node);
+	} else {
+		tipc_evt_write(evt, found_lower, s->seq.lower);
+		tipc_evt_write(evt, found_upper, s->seq.upper);
+		tipc_evt_write(evt, port.ref, 0);
+		tipc_evt_write(evt, port.node, 0);
+	}
 	tipc_topsrv_queue_evt(sub->net, sub->conid, event, evt);
 }
 
 /**
  * tipc_sub_check_overlap - test for subscription overlap with the given values
- * @seq: tipc_name_seq to check
- * @found_lower: lower value to test
- * @found_upper: upper value to test
+ * @subscribed: the service range subscribed for
+ * @found: the service range we are checning for match
  *
- * Return: 1 if there is overlap, otherwise 0.
+ * Returns true if there is overlap, otherwise false.
  */
-int tipc_sub_check_overlap(struct tipc_service_range *seq, u32 found_lower,
-			   u32 found_upper)
+static bool tipc_sub_check_overlap(struct tipc_service_range *subscribed,
+				   struct tipc_service_range *found)
 {
-	if (found_lower < seq->lower)
-		found_lower = seq->lower;
-	if (found_upper > seq->upper)
-		found_upper = seq->upper;
-	if (found_lower > found_upper)
-		return 0;
-	return 1;
+	u32 found_lower = found->lower;
+	u32 found_upper = found->upper;
+
+	if (found_lower < subscribed->lower)
+		found_lower = subscribed->lower;
+	if (found_upper > subscribed->upper)
+		found_upper = subscribed->upper;
+	return found_lower <= found_upper;
 }
 
 void tipc_sub_report_overlap(struct tipc_subscription *sub,
-			     u32 found_lower, u32 found_upper,
-			     u32 event, u32 port, u32 node,
-			     u32 scope, int must)
+			     struct publication *p,
+			     u32 event, bool must)
 {
-	struct tipc_subscr *s = &sub->evt.s;
-	u32 filter = tipc_sub_read(s, filter);
-	struct tipc_service_range seq;
+	struct tipc_service_range *sr = &sub->s.seq;
+	u32 filter = sub->s.filter;
 
-	seq.type = tipc_sub_read(s, seq.type);
-	seq.lower = tipc_sub_read(s, seq.lower);
-	seq.upper = tipc_sub_read(s, seq.upper);
-
-	if (!tipc_sub_check_overlap(&seq, found_lower, found_upper))
+	if (!tipc_sub_check_overlap(sr, &p->sr))
 		return;
-
 	if (!must && !(filter & TIPC_SUB_PORTS))
 		return;
-	if (filter & TIPC_SUB_CLUSTER_SCOPE && scope == TIPC_NODE_SCOPE)
+	if (filter & TIPC_SUB_CLUSTER_SCOPE && p->scope == TIPC_NODE_SCOPE)
 		return;
-	if (filter & TIPC_SUB_NODE_SCOPE && scope != TIPC_NODE_SCOPE)
+	if (filter & TIPC_SUB_NODE_SCOPE && p->scope != TIPC_NODE_SCOPE)
 		return;
 	spin_lock(&sub->lock);
-	tipc_sub_send_event(sub, found_lower, found_upper,
-			    event, port, node);
+	tipc_sub_send_event(sub, p, event);
 	spin_unlock(&sub->lock);
 }
 
 static void tipc_sub_timeout(struct timer_list *t)
 {
 	struct tipc_subscription *sub = from_timer(sub, t, timer);
-	struct tipc_subscr *s = &sub->evt.s;
 
 	spin_lock(&sub->lock);
-	tipc_sub_send_event(sub, s->seq.lower, s->seq.upper,
-			    TIPC_SUBSCR_TIMEOUT, 0, 0);
+	tipc_sub_send_event(sub, NULL, TIPC_SUBSCR_TIMEOUT);
 	sub->inactive = true;
 	spin_unlock(&sub->lock);
 }
@@ -134,12 +132,14 @@ struct tipc_subscription *tipc_sub_subscribe(struct net *net,
 					     struct tipc_subscr *s,
 					     int conid)
 {
+	u32 lower = tipc_sub_read(s, seq.lower);
+	u32 upper = tipc_sub_read(s, seq.upper);
 	u32 filter = tipc_sub_read(s, filter);
 	struct tipc_subscription *sub;
 	u32 timeout;
 
 	if ((filter & TIPC_SUB_PORTS && filter & TIPC_SUB_SERVICE) ||
-	    (tipc_sub_read(s, seq.lower) > tipc_sub_read(s, seq.upper))) {
+	    lower > upper) {
 		pr_warn("Subscription rejected, illegal request\n");
 		return NULL;
 	}
@@ -154,6 +154,12 @@ struct tipc_subscription *tipc_sub_subscribe(struct net *net,
 	sub->conid = conid;
 	sub->inactive = false;
 	memcpy(&sub->evt.s, s, sizeof(*s));
+	sub->s.seq.type = tipc_sub_read(s, seq.type);
+	sub->s.seq.lower = lower;
+	sub->s.seq.upper = upper;
+	sub->s.filter = filter;
+	sub->s.timeout = tipc_sub_read(s, timeout);
+	memcpy(sub->s.usr_handle, s->usr_handle, 8);
 	spin_lock_init(&sub->lock);
 	kref_init(&sub->kref);
 	if (!tipc_nametbl_subscribe(sub)) {

net/tipc/subscr.h

@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2003-2017, Ericsson AB
  * Copyright (c) 2005-2007, 2012-2013, Wind River Systems
- * Copyright (c) 2020, Red Hat Inc
+ * Copyright (c) 2020-2021, Red Hat Inc
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -43,6 +43,7 @@
 #define TIPC_MAX_SUBSCR         65535
 #define TIPC_MAX_PUBL           65535
 
+struct publication;
 struct tipc_subscription;
 struct tipc_conn;
 
@@ -59,12 +60,13 @@ struct tipc_conn;
  * @lock: serialize up/down and timer events
  */
 struct tipc_subscription {
+	struct tipc_subscr s;
+	struct tipc_event evt;
 	struct kref kref;
 	struct net *net;
 	struct timer_list timer;
 	struct list_head service_list;
 	struct list_head sub_list;
-	struct tipc_event evt;
 	int conid;
 	bool inactive;
 	spinlock_t lock;
@@ -74,13 +76,9 @@ struct tipc_subscription *tipc_sub_subscribe(struct net *net,
 					     struct tipc_subscr *s,
 					     int conid);
 void tipc_sub_unsubscribe(struct tipc_subscription *sub);
-
-int tipc_sub_check_overlap(struct tipc_service_range *seq,
-			   u32 found_lower, u32 found_upper);
 void tipc_sub_report_overlap(struct tipc_subscription *sub,
-			     u32 found_lower, u32 found_upper,
-			     u32 event, u32 port, u32 node,
-			     u32 scope, int must);
+			     struct publication *p,
+			     u32 event, bool must);
 
 int __net_init tipc_topsrv_init_net(struct net *net);
 void __net_exit tipc_topsrv_exit_net(struct net *net);