@@ -376,6 +376,12 @@ struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
const struct sk_buff *skb,
int flags, pol_lookup_t lookup);
+/* called with rcu lock held; can return error pointer
+ * caller needs to select path
+ */
+struct fib6_info *fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
+ int flags);
+
/* called with rcu lock held; caller needs to select path */
struct fib6_info *fib6_table_lookup(struct net *net, struct fib6_table *table,
int oif, struct flowi6 *fl6, int strict);
@@ -60,6 +60,39 @@ unsigned int fib6_rules_seq_read(struct net *net)
return fib_rules_seq_read(net, AF_INET6);
}
+/* called with rcu lock held; no reference taken on fib6_info */
+struct fib6_info *fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
+ int flags)
+{
+ struct fib6_info *f6i;
+ int err;
+
+ if (net->ipv6.fib6_has_custom_rules) {
+ struct fib_lookup_arg arg = {
+ .lookup_ptr = fib6_table_lookup,
+ .lookup_data = &oif,
+ .flags = FIB_LOOKUP_NOREF,
+ };
+
+ l3mdev_update_flow(net, flowi6_to_flowi(fl6));
+
+ err = fib_rules_lookup(net->ipv6.fib6_rules_ops,
+ flowi6_to_flowi(fl6), flags, &arg);
+ if (err)
+ return ERR_PTR(err);
+
+ f6i = arg.result ? : net->ipv6.fib6_null_entry;
+ } else {
+ f6i = fib6_table_lookup(net, net->ipv6.fib6_local_tbl,
+ oif, fl6, flags);
+ if (!f6i || f6i == net->ipv6.fib6_null_entry)
+ f6i = fib6_table_lookup(net, net->ipv6.fib6_main_tbl,
+ oif, fl6, flags);
+ }
+
+ return f6i;
+}
+
struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
const struct sk_buff *skb,
int flags, pol_lookup_t lookup)
@@ -121,8 +154,45 @@ static int fib6_rule_saddr(struct net *net, struct fib_rule *rule, int flags,
return 0;
}
-static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
- int flags, struct fib_lookup_arg *arg)
+static int fib6_rule_action_alt(struct fib_rule *rule, struct flowi *flp,
+ int flags, struct fib_lookup_arg *arg)
+{
+ struct flowi6 *flp6 = &flp->u.ip6;
+ struct net *net = rule->fr_net;
+ struct fib6_table *table;
+ struct fib6_info *f6i;
+ int err = 0, *oif;
+ u32 tb_id;
+
+ switch (rule->action) {
+ case FR_ACT_TO_TBL:
+ break;
+ case FR_ACT_UNREACHABLE:
+ return -ENETUNREACH;
+ case FR_ACT_PROHIBIT:
+ return -EACCES;
+ case FR_ACT_BLACKHOLE:
+ default:
+ return -EINVAL;
+ }
+
+ tb_id = fib_rule_get_table(rule, arg);
+ table = fib6_get_table(net, tb_id);
+ if (!table)
+ return -EAGAIN;
+
+ oif = (int *)arg->lookup_data;
+ f6i = fib6_table_lookup(net, table, *oif, flp6, flags);
+ if (f6i != net->ipv6.fib6_null_entry)
+ err = fib6_rule_saddr(net, rule, flags, flp6,
+ fib6_info_nh_dev(f6i));
+
+ arg->result = f6i;
+ return err;
+}
+
+static int __fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
+ int flags, struct fib_lookup_arg *arg)
{
struct flowi6 *flp6 = &flp->u.ip6;
struct rt6_info *rt = NULL;
@@ -182,6 +252,15 @@ static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
return err;
}
+static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
+ int flags, struct fib_lookup_arg *arg)
+{
+ if (arg->lookup_ptr == fib6_table_lookup)
+ return fib6_rule_action_alt(rule, flp, flags, arg);
+
+ return __fib6_rule_action(rule, flp, flags, arg);
+}
+
static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
{
struct rt6_info *rt = (struct rt6_info *) arg->result;
@@ -354,6 +354,13 @@ struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
return &rt->dst;
}
+/* called with rcu lock held; no reference taken on fib6_info */
+struct fib6_info *fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
+ int flags)
+{
+ return fib6_table_lookup(net, net->ipv6.fib6_main_tbl, oif, fl6, flags);
+}
+
static void __net_init fib6_tables_init(struct net *net)
{
fib6_link_table(net, net->ipv6.fib6_main_tbl);
Add IPv6 equivalent to fib_lookup. Does a fib lookup, including rules, but returns a FIB entry, fib6_info, rather than a dst based rt6_info. fib6_lookup is on the order of 40% faster than any of the dst based lookup methods without custom rules and 25% faster with custom rules. Since the lookup function has a completely different signature, fib6_rule_action is split into 2 paths: the existing one is renamed __fib6_rule_action and a new one for the fib6_info path is added. fib6_rule_action decides which to call based on the lookup_ptr. If it is fib6_table_lookup then the new path is taken. Caller must hold rcu lock as no reference is taken on the returned fib entry. Signed-off-by: David Ahern <dsahern@gmail.com> --- include/net/ip6_fib.h | 6 ++++ net/ipv6/fib6_rules.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++-- net/ipv6/ip6_fib.c | 7 +++++ 3 files changed, 94 insertions(+), 2 deletions(-)