tipc: Add routines for safe checking of node's network address

Introduces routines that test whether a given network address is
equal to a node's own network address or if it lies within the node's
own network cluster, and which work properly regardless of whether
the node is using the default network address <0.0.0> or a non-zero
network address that is assigned later on. In essence, these routines
ensure that address <0.0.0> is treated as an alias for "this node",
regardless of which network address the node is actually using.

Old users of the pre-existing more strict match in_own_cluster()
have been accordingly redirected to what is now called
in_own_cluster_exact() --- which does not extend matching to <0,0,0>.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/net/tipc/addr.h b/net/tipc/addr.h
index e4f35af..d706a1d 100644 (file)
--- a/net/tipc/addr.h
+++ b/net/tipc/addr.h
@@ -50,12 +50,30 @@ static inline u32 tipc_cluster_mask(u32 addr)
        return addr & TIPC_CLUSTER_MASK;
 }
 
-static inline int in_own_cluster(u32 addr)
+static inline int in_own_cluster_exact(u32 addr)
 {
        return !((addr ^ tipc_own_addr) >> 12);
 }
 
 /**
+ * in_own_node - test for node inclusion; <0.0.0> always matches
+ */
+
+static inline int in_own_node(u32 addr)
+{
+       return (addr == tipc_own_addr) || !addr;
+}
+
+/**
+ * in_own_cluster - test for cluster inclusion; <0.0.0> always matches
+ */
+
+static inline int in_own_cluster(u32 addr)
+{
+       return in_own_cluster_exact(addr) || !addr;
+}
+
+/**
  * addr_domain - convert 2-bit scope value to equivalent message lookup domain
  *
  * Needed when address of a named message must be looked up a second time

diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 5dfd89c..0bfdeba 100644 (file)
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -449,7 +449,7 @@ int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority)
                if (tipc_in_scope(disc_domain, tipc_own_addr)) {
                        disc_domain = tipc_own_addr & TIPC_CLUSTER_MASK;
                        res = 0;   /* accept any node in own cluster */
-               } else if (in_own_cluster(disc_domain))
+               } else if (in_own_cluster_exact(disc_domain))
                        res = 0;   /* accept specified node in own cluster */
        }
        if (res) {

diff --git a/net/tipc/name_table.c b/net/tipc/name_table.c
index 5d70042..1e0518d 100644 (file)
--- a/net/tipc/name_table.c
+++ b/net/tipc/name_table.c
@@ -342,7 +342,7 @@ static struct publication *tipc_nameseq_insert_publ(struct name_seq *nseq,
        list_add(&publ->zone_list, &info->zone_list);
        info->zone_list_size++;
 
-       if (in_own_cluster(node)) {
+       if (in_own_cluster_exact(node)) {
                list_add(&publ->cluster_list, &info->cluster_list);
                info->cluster_list_size++;
        }
@@ -411,7 +411,7 @@ found:
 
        /* Remove publication from cluster scope list, if present */
 
-       if (in_own_cluster(node)) {
+       if (in_own_cluster_exact(node)) {
                list_del(&publ->cluster_list);
                info->cluster_list_size--;
        }
@@ -604,7 +604,7 @@ u32 tipc_nametbl_translate(u32 type, u32 instance, u32 *destnode)
                publ = list_first_entry(&info->node_list, struct publication,
                                        node_list);
                list_move_tail(&publ->node_list, &info->node_list);
-       } else if (in_own_cluster(*destnode)) {
+       } else if (in_own_cluster_exact(*destnode)) {
                if (list_empty(&info->cluster_list))
                        goto no_match;
                publ = list_first_entry(&info->cluster_list, struct publication,

diff --git a/net/tipc/node.c b/net/tipc/node.c
index a34cabc..6a71bea 100644 (file)
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -72,7 +72,7 @@ struct tipc_node *tipc_node_find(u32 addr)
        struct tipc_node *node;
        struct hlist_node *pos;
 
-       if (unlikely(!in_own_cluster(addr)))
+       if (unlikely(!in_own_cluster_exact(addr)))
                return NULL;
 
        hlist_for_each_entry(node, pos, &node_htable[tipc_hashfn(addr)], hash) {