From: David Ahern <dsahern@gmail.com>
To: netdev@vger.kernel.org, borkmann@iogearbox.net, ast@kernel.org
Cc: davem@davemloft.net, shm@cumulusnetworks.com,
roopa@cumulusnetworks.com, brouer@redhat.com, toke@toke.dk,
john.fastabend@gmail.com, David Ahern <dsahern@gmail.com>
Subject: [bpf-next v2 3/9] net/ipv6: Extract table lookup from ip6_pol_route
Date: Thu, 3 May 2018 19:54:26 -0700 [thread overview]
Message-ID: <20180504025432.23451-4-dsahern@gmail.com> (raw)
In-Reply-To: <20180504025432.23451-1-dsahern@gmail.com>
ip6_pol_route is used for ingress and egress FIB lookups. Refactor it
moving the table lookup into a separate fib6_table_lookup that can be
invoked separately and export the new function.
ip6_pol_route now calls fib6_table_lookup and uses the result to generate
a dst based rt6_info.
Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: David S. Miller <davem@davemloft.net>
---
include/net/ip6_fib.h | 4 ++++
net/ipv6/route.c | 39 +++++++++++++++++++++++++--------------
2 files changed, 29 insertions(+), 14 deletions(-)
diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 80d76d8dc683..4f7b8f59ea6d 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -376,6 +376,10 @@ 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; 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);
+
struct fib6_info *fib6_multipath_select(const struct net *net,
struct fib6_info *match,
struct flowi6 *fl6, int oif,
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 58af969f3a2c..d0ace0c5c3e9 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1800,21 +1800,12 @@ void rt6_age_exceptions(struct fib6_info *rt,
rcu_read_unlock_bh();
}
-struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
- int oif, struct flowi6 *fl6,
- const struct sk_buff *skb, int flags)
+/* must be called with rcu lock held */
+struct fib6_info *fib6_table_lookup(struct net *net, struct fib6_table *table,
+ int oif, struct flowi6 *fl6, int strict)
{
struct fib6_node *fn, *saved_fn;
struct fib6_info *f6i;
- struct rt6_info *rt;
- int strict = 0;
-
- strict |= flags & RT6_LOOKUP_F_IFACE;
- strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
- if (net->ipv6.devconf_all->forwarding == 0)
- strict |= RT6_LOOKUP_F_REACHABLE;
-
- rcu_read_lock();
fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
saved_fn = fn;
@@ -1824,8 +1815,6 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
redo_rt6_select:
f6i = rt6_select(net, fn, oif, strict);
- if (f6i->fib6_nsiblings)
- f6i = fib6_multipath_select(net, f6i, fl6, oif, skb, strict);
if (f6i == net->ipv6.fib6_null_entry) {
fn = fib6_backtrack(fn, &fl6->saddr);
if (fn)
@@ -1838,6 +1827,28 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
}
}
+ return f6i;
+}
+
+struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
+ int oif, struct flowi6 *fl6,
+ const struct sk_buff *skb, int flags)
+{
+ struct fib6_info *f6i;
+ struct rt6_info *rt;
+ int strict = 0;
+
+ strict |= flags & RT6_LOOKUP_F_IFACE;
+ strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
+ if (net->ipv6.devconf_all->forwarding == 0)
+ strict |= RT6_LOOKUP_F_REACHABLE;
+
+ rcu_read_lock();
+
+ f6i = fib6_table_lookup(net, table, oif, fl6, strict);
+ if (f6i->fib6_nsiblings)
+ f6i = fib6_multipath_select(net, f6i, fl6, oif, skb, strict);
+
if (f6i == net->ipv6.fib6_null_entry) {
rt = net->ipv6.ip6_null_entry;
rcu_read_unlock();
--
2.11.0
next prev parent reply other threads:[~2018-05-04 2:54 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-04 2:54 [bpf-next v2 0/9] bpf: Add helper to do FIB lookups David Ahern
2018-05-04 2:54 ` [bpf-next v2 1/9] net/ipv6: Rename fib6_lookup to fib6_node_lookup David Ahern
2018-05-04 2:54 ` [bpf-next v2 2/9] net/ipv6: Rename rt6_multipath_select David Ahern
2018-05-04 2:54 ` David Ahern [this message]
2018-05-04 2:54 ` [bpf-next v2 4/9] net/ipv6: Refactor fib6_rule_action David Ahern
2018-05-04 2:54 ` [bpf-next v2 5/9] net/ipv6: Add fib6_lookup David Ahern
2018-05-04 2:54 ` [bpf-next v2 6/9] net/ipv6: Update fib6 tracepoint to take fib6_info David Ahern
2018-05-04 2:54 ` [bpf-next v2 7/9] net/ipv6: Add fib lookup stubs for use in bpf helper David Ahern
2018-05-04 2:54 ` [bpf-next v2 8/9] bpf: Provide helper to do forwarding lookups in kernel FIB table David Ahern
2018-05-07 13:35 ` Jesper Dangaard Brouer
2018-05-07 14:10 ` Daniel Borkmann
2018-05-07 14:26 ` David Ahern
2018-05-07 15:36 ` David Miller
2018-05-09 8:15 ` Daniel Borkmann
2018-05-09 16:05 ` David Ahern
2018-05-09 20:44 ` Daniel Borkmann
2018-05-09 21:29 ` David Ahern
2018-05-09 21:39 ` David Ahern
2018-05-09 21:49 ` Alexei Starovoitov
2018-05-09 21:49 ` Daniel Borkmann
2018-05-04 2:54 ` [bpf-next v2 9/9] samples/bpf: Add example of ipv4 and ipv6 forwarding in XDP David Ahern
2018-05-08 23:53 ` [bpf-next v2 0/9] bpf: Add helper to do FIB lookups Daniel Borkmann
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