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[NET] rules: Unified rules dumping

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Implements a unified, protocol independant rules dumping function
which is capable of both, dumping a specific protocol family or
all of them. This speeds up dumping as less lookups are required.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf
2007-03-25 23:24:24 -07:00
committed by David S. Miller
parent 687ad8cc64
commit c454673da7
6 changed files with 45 additions and 34 deletions
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47
net/core/fib_rules.c
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@@ -393,19 +393,15 @@ nla_put_failure:
return -EMSGSIZE;
}
int fib_rules_dump(struct sk_buff *skb, struct netlink_callback *cb, int family)
static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
struct fib_rules_ops *ops)
{
int idx = 0;
struct fib_rule *rule;
struct fib_rules_ops *ops;
ops = lookup_rules_ops(family);
if (ops == NULL)
return -EAFNOSUPPORT;
rcu_read_lock();
list_for_each_entry_rcu(rule, ops->rules_list, list) {
if (idx < cb->args[0])
if (idx < cb->args[1])
goto skip;
if (fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).pid,
@@ -416,13 +412,44 @@ skip:
idx++;
}
rcu_read_unlock();
cb->args[0] = idx;
cb->args[1] = idx;
rules_ops_put(ops);
return skb->len;
}
EXPORT_SYMBOL_GPL(fib_rules_dump);
static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
{
struct fib_rules_ops *ops;
int idx = 0, family;
family = rtnl_msg_family(cb->nlh);
if (family != AF_UNSPEC) {
/* Protocol specific dump request */
ops = lookup_rules_ops(family);
if (ops == NULL)
return -EAFNOSUPPORT;
return dump_rules(skb, cb, ops);
}
rcu_read_lock();
list_for_each_entry_rcu(ops, &rules_ops, list) {
if (idx < cb->args[0] || !try_module_get(ops->owner))
goto skip;
if (dump_rules(skb, cb, ops) < 0)
break;
cb->args[1] = 0;
skip:
idx++;
}
rcu_read_unlock();
cb->args[0] = idx;
return skb->len;
}
static void notify_rule_change(int event, struct fib_rule *rule,
struct fib_rules_ops *ops, struct nlmsghdr *nlh,
@@ -503,7 +530,7 @@ static int __init fib_rules_init(void)
{
rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL);
rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL);
rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, rtnl_dump_all);
rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule);
return register_netdevice_notifier(&fib_rules_notifier);
}