netdev - [PATCH net-next 05/22] lwtunnel: support dst output redirect function

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <c671f60e1ecf0ef03a765f82947e538431c2a79f.1437137396.git.tgraf@suug.ch>
Date:	Fri, 17 Jul 2015 14:55:24 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	roopa@...ulusnetworks.com, rshearma@...cade.com,
	ebiederm@...ssion.com, hannes@...essinduktion.org,
	pshelar@...ira.com, jesse@...ira.com, davem@...emloft.net,
	daniel@...earbox.net, tom@...bertland.com, edumazet@...gle.com,
	jiri@...nulli.us, marcelo.leitner@...il.com,
	stephen@...workplumber.org, jpettit@...ira.com, kaber@...sh.net,
	simon.horman@...ronome.com, joestringer@...ira.com, ja@....bg,
	ast@...mgrid.com, weichunc@...mgrid.com
Cc:	netdev@...r.kernel.org, dev@...nvswitch.org
Subject: [PATCH net-next 05/22] lwtunnel: support dst output redirect function

From: Roopa Prabhu <roopa@...ulusnetworks.com>

This patch introduces lwtunnel_output function to call corresponding
lwtunnels output function to xmit the packet.

It adds two variants lwtunnel_output and lwtunnel_output6 for ipv4 and
ipv6 respectively today. But this is subject to change when lwtstate will
reside in dst or dst_metadata (as per upstream discussions).

Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
---
 include/net/lwtunnel.h | 12 +++++++++++
 net/core/lwtunnel.c    | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+)

diff --git a/include/net/lwtunnel.h b/include/net/lwtunnel.h
index df24b36..918e03c 100644
--- a/include/net/lwtunnel.h
+++ b/include/net/lwtunnel.h
@@ -69,6 +69,8 @@ int lwtunnel_fill_encap(struct sk_buff *skb,
 int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate);
 struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len);
 int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b);
+int lwtunnel_output(struct sock *sk, struct sk_buff *skb);
+int lwtunnel_output6(struct sock *sk, struct sk_buff *skb);
 
 #else
 
@@ -127,6 +129,16 @@ static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
 	return 0;
 }
 
+static inline int lwtunnel_output(struct sock *sk, struct sk_buff *skb)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int lwtunnel_output6(struct sock *sk, struct sk_buff *skb)
+{
+	return -EOPNOTSUPP;
+}
+
 #endif
 
 #endif /* __NET_LWTUNNEL_H */
diff --git a/net/core/lwtunnel.c b/net/core/lwtunnel.c
index d7ae3a2..bb58826 100644
--- a/net/core/lwtunnel.c
+++ b/net/core/lwtunnel.c
@@ -25,6 +25,7 @@
 
 #include <net/lwtunnel.h>
 #include <net/rtnetlink.h>
+#include <net/ip6_fib.h>
 
 struct lwtunnel_state *lwtunnel_state_alloc(int encap_len)
 {
@@ -177,3 +178,58 @@ int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
 	return ret;
 }
 EXPORT_SYMBOL(lwtunnel_cmp_encap);
+
+int __lwtunnel_output(struct sock *sk, struct sk_buff *skb,
+		      struct lwtunnel_state *lwtstate)
+{
+	const struct lwtunnel_encap_ops *ops;
+	int ret = -EINVAL;
+
+	if (!lwtstate)
+		goto drop;
+
+	if (lwtstate->type == LWTUNNEL_ENCAP_NONE ||
+	    lwtstate->type > LWTUNNEL_ENCAP_MAX)
+		return 0;
+
+	ret = -EOPNOTSUPP;
+	rcu_read_lock();
+	ops = rcu_dereference(lwtun_encaps[lwtstate->type]);
+	if (likely(ops && ops->output))
+		ret = ops->output(sk, skb);
+	rcu_read_unlock();
+
+	if (ret == -EOPNOTSUPP)
+		goto drop;
+
+	return ret;
+
+drop:
+	kfree(skb);
+
+	return ret;
+}
+
+int lwtunnel_output6(struct sock *sk, struct sk_buff *skb)
+{
+	struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
+	struct lwtunnel_state *lwtstate = NULL;
+
+	if (rt)
+		lwtstate = rt->rt6i_lwtstate;
+
+	return __lwtunnel_output(sk, skb, lwtstate);
+}
+EXPORT_SYMBOL(lwtunnel_output6);
+
+int lwtunnel_output(struct sock *sk, struct sk_buff *skb)
+{
+	struct rtable *rt = (struct rtable *)skb_dst(skb);
+	struct lwtunnel_state *lwtstate = NULL;
+
+	if (rt)
+		lwtstate = rt->rt_lwtstate;
+
+	return __lwtunnel_output(sk, skb, lwtstate);
+}
+EXPORT_SYMBOL(lwtunnel_output);
-- 
2.4.3

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html