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Message-Id: <20190914064608.26799-4-jiri@resnulli.us>
Date: Sat, 14 Sep 2019 08:45:56 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, idosch@...lanox.com, dsahern@...il.com,
jakub.kicinski@...ronome.com, tariqt@...lanox.com,
saeedm@...lanox.com, kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org,
shuah@...nel.org, mlxsw@...lanox.com
Subject: [patch net-next 03/15] net: fib_notifier: propagate possible error during fib notifier registration
From: Jiri Pirko <jiri@...lanox.com>
Unlike events for registered notifier, during the registration, the
errors that happened for the block being registered are not propagated
up to the caller. For fib rules, this is already present, but not for
fib entries. So make sure the error is propagated for those as well.
Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
include/net/ip_fib.h | 2 +-
net/core/fib_notifier.c | 2 --
net/core/fib_rules.c | 11 ++++++++---
net/ipv4/fib_notifier.c | 4 +---
net/ipv4/fib_trie.c | 31 ++++++++++++++++++++++---------
net/ipv4/ipmr_base.c | 22 +++++++++++++++-------
net/ipv6/ip6_fib.c | 36 ++++++++++++++++++++++++------------
7 files changed, 71 insertions(+), 37 deletions(-)
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 4cec9ecaa95e..caae0fa610aa 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -229,7 +229,7 @@ int __net_init fib4_notifier_init(struct net *net);
void __net_exit fib4_notifier_exit(struct net *net);
void fib_info_notify_update(struct net *net, struct nl_info *info);
-void fib_notify(struct net *net, struct notifier_block *nb);
+int fib_notify(struct net *net, struct notifier_block *nb);
struct fib_table {
struct hlist_node tb_hlist;
diff --git a/net/core/fib_notifier.c b/net/core/fib_notifier.c
index b965f3c0ec9a..fbd029425638 100644
--- a/net/core/fib_notifier.c
+++ b/net/core/fib_notifier.c
@@ -65,8 +65,6 @@ static int fib_net_dump(struct net *net, struct notifier_block *nb)
rcu_read_lock();
list_for_each_entry_rcu(ops, &fn_net->fib_notifier_ops, list) {
- int err;
-
if (!try_module_get(ops->owner))
continue;
err = ops->fib_dump(net, nb);
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index 28cbf07102bc..592d8aef90e3 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -354,15 +354,20 @@ int fib_rules_dump(struct net *net, struct notifier_block *nb, int family)
{
struct fib_rules_ops *ops;
struct fib_rule *rule;
+ int err = 0;
ops = lookup_rules_ops(net, family);
if (!ops)
return -EAFNOSUPPORT;
- list_for_each_entry_rcu(rule, &ops->rules_list, list)
- call_fib_rule_notifier(nb, FIB_EVENT_RULE_ADD, rule, family);
+ list_for_each_entry_rcu(rule, &ops->rules_list, list) {
+ err = call_fib_rule_notifier(nb, FIB_EVENT_RULE_ADD,
+ rule, family);
+ if (err)
+ break;
+ }
rules_ops_put(ops);
- return 0;
+ return err;
}
EXPORT_SYMBOL_GPL(fib_rules_dump);
diff --git a/net/ipv4/fib_notifier.c b/net/ipv4/fib_notifier.c
index 1a128c1346fb..0c57f68a9340 100644
--- a/net/ipv4/fib_notifier.c
+++ b/net/ipv4/fib_notifier.c
@@ -42,9 +42,7 @@ static int fib4_dump(struct net *net, struct notifier_block *nb)
if (err)
return err;
- fib_notify(net, nb);
-
- return 0;
+ return fib_notify(net, nb);
}
static const struct fib_notifier_ops fib4_notifier_ops_template = {
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 5b600b2a2aa3..568e59423773 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -2015,10 +2015,11 @@ void fib_info_notify_update(struct net *net, struct nl_info *info)
}
}
-static void fib_leaf_notify(struct key_vector *l, struct fib_table *tb,
- struct notifier_block *nb)
+static int fib_leaf_notify(struct key_vector *l, struct fib_table *tb,
+ struct notifier_block *nb)
{
struct fib_alias *fa;
+ int err;
hlist_for_each_entry_rcu(fa, &l->leaf, fa_list) {
struct fib_info *fi = fa->fa_info;
@@ -2032,38 +2033,50 @@ static void fib_leaf_notify(struct key_vector *l, struct fib_table *tb,
if (tb->tb_id != fa->tb_id)
continue;
- call_fib_entry_notifier(nb, FIB_EVENT_ENTRY_ADD, l->key,
- KEYLENGTH - fa->fa_slen, fa);
+ err = call_fib_entry_notifier(nb, FIB_EVENT_ENTRY_ADD, l->key,
+ KEYLENGTH - fa->fa_slen, fa);
+ if (err)
+ return err;
}
+ return 0;
}
-static void fib_table_notify(struct fib_table *tb, struct notifier_block *nb)
+static int fib_table_notify(struct fib_table *tb, struct notifier_block *nb)
{
struct trie *t = (struct trie *)tb->tb_data;
struct key_vector *l, *tp = t->kv;
t_key key = 0;
+ int err;
while ((l = leaf_walk_rcu(&tp, key)) != NULL) {
- fib_leaf_notify(l, tb, nb);
+ err = fib_leaf_notify(l, tb, nb);
+ if (err)
+ return err;
key = l->key + 1;
/* stop in case of wrap around */
if (key < l->key)
break;
}
+ return 0;
}
-void fib_notify(struct net *net, struct notifier_block *nb)
+int fib_notify(struct net *net, struct notifier_block *nb)
{
unsigned int h;
+ int err;
for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
struct hlist_head *head = &net->ipv4.fib_table_hash[h];
struct fib_table *tb;
- hlist_for_each_entry_rcu(tb, head, tb_hlist)
- fib_table_notify(tb, nb);
+ hlist_for_each_entry_rcu(tb, head, tb_hlist) {
+ err = fib_table_notify(tb, nb);
+ if (err)
+ return err;
+ }
}
+ return 0;
}
static void __trie_free_rcu(struct rcu_head *head)
diff --git a/net/ipv4/ipmr_base.c b/net/ipv4/ipmr_base.c
index 4dcc3214e3cc..c4e23c2a0d5c 100644
--- a/net/ipv4/ipmr_base.c
+++ b/net/ipv4/ipmr_base.c
@@ -409,17 +409,25 @@ int mr_dump(struct net *net, struct notifier_block *nb, unsigned short family,
if (!v->dev)
continue;
- mr_call_vif_notifier(nb, family,
- FIB_EVENT_VIF_ADD,
- v, vifi, mrt->id);
+ err = mr_call_vif_notifier(nb, family,
+ FIB_EVENT_VIF_ADD,
+ v, vifi, mrt->id);
+ if (err)
+ break;
}
read_unlock(mrt_lock);
+ if (err)
+ return err;
+
/* Notify on table MFC entries */
- list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list)
- mr_call_mfc_notifier(nb, family,
- FIB_EVENT_ENTRY_ADD,
- mfc, mrt->id);
+ list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list) {
+ err = mr_call_mfc_notifier(nb, family,
+ FIB_EVENT_ENTRY_ADD,
+ mfc, mrt->id);
+ if (err)
+ return err;
+ }
}
return 0;
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index a6d500023457..4acca152843a 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -403,30 +403,37 @@ struct fib6_dump_arg {
struct notifier_block *nb;
};
-static void fib6_rt_dump(struct fib6_info *rt, struct fib6_dump_arg *arg)
+static int fib6_rt_dump(struct fib6_info *rt, struct fib6_dump_arg *arg)
{
if (rt == arg->net->ipv6.fib6_null_entry)
- return;
- call_fib6_entry_notifier(arg->nb, FIB_EVENT_ENTRY_ADD, rt);
+ return 0;
+ return call_fib6_entry_notifier(arg->nb, FIB_EVENT_ENTRY_ADD, rt);
}
static int fib6_node_dump(struct fib6_walker *w)
{
struct fib6_info *rt;
+ int err = 0;
- for_each_fib6_walker_rt(w)
- fib6_rt_dump(rt, w->args);
+ for_each_fib6_walker_rt(w) {
+ err = fib6_rt_dump(rt, w->args);
+ if (err)
+ break;
+ }
w->leaf = NULL;
- return 0;
+ return err;
}
-static void fib6_table_dump(struct net *net, struct fib6_table *tb,
- struct fib6_walker *w)
+static int fib6_table_dump(struct net *net, struct fib6_table *tb,
+ struct fib6_walker *w)
{
+ int err;
+
w->root = &tb->tb6_root;
spin_lock_bh(&tb->tb6_lock);
- fib6_walk(net, w);
+ err = fib6_walk(net, w);
spin_unlock_bh(&tb->tb6_lock);
+ return err;
}
/* Called with rcu_read_lock() */
@@ -435,6 +442,7 @@ int fib6_tables_dump(struct net *net, struct notifier_block *nb)
struct fib6_dump_arg arg;
struct fib6_walker *w;
unsigned int h;
+ int err = 0;
w = kzalloc(sizeof(*w), GFP_ATOMIC);
if (!w)
@@ -449,13 +457,17 @@ int fib6_tables_dump(struct net *net, struct notifier_block *nb)
struct hlist_head *head = &net->ipv6.fib_table_hash[h];
struct fib6_table *tb;
- hlist_for_each_entry_rcu(tb, head, tb6_hlist)
- fib6_table_dump(net, tb, w);
+ hlist_for_each_entry_rcu(tb, head, tb6_hlist) {
+ err = fib6_table_dump(net, tb, w);
+ if (err < 0)
+ goto out;
+ }
}
+out:
kfree(w);
- return 0;
+ return err;
}
static int fib6_dump_node(struct fib6_walker *w)
--
2.21.0
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