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Date: Tue, 29 Sep 2015 15:17:21 -0700
From: Tom Herbert <tom@...bertland.com>
To: <davem@...emloft.net>, <netdev@...r.kernel.org>
CC: <kernel-team@...com>
Subject: [PATCH net-next 4/6] xfrm: Add xfrm6 address translation function
This patch adds xfrm6_xlat_addr which is called in the data path
to perform address translation (primarily for the receive path). Modules
may register their own callback to perform a translation-- this
registration is managed by xfrm6_xlat_addr_add and xfrm6_xlat_addr_del.
xfrm6_xlat_addr allows translation of addresses for an sk_buff.
Signed-off-by: Tom Herbert <tom@...bertland.com>
---
include/net/xfrm.h | 25 ++++++++++++++++++
net/ipv6/Kconfig | 4 +++
net/ipv6/Makefile | 1 +
net/ipv6/xfrm6_policy.c | 7 +++++
net/ipv6/xfrm6_xlat_addr.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 103 insertions(+)
create mode 100644 net/ipv6/xfrm6_xlat_addr.c
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index fd17610..ea05c4e 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -607,6 +607,31 @@ struct xfrm_mgr {
int xfrm_register_km(struct xfrm_mgr *km);
int xfrm_unregister_km(struct xfrm_mgr *km);
+struct xfrm6_xlat_addr {
+ int (*xlat)(struct sk_buff *skb);
+ struct list_head list;
+};
+
+#ifdef CONFIG_INET6_XFRM_XLAT_ADDR
+void xfrm6_xlat_addr_add(struct xfrm6_xlat_addr *xla);
+void xfrm6_xlat_addr_del(struct xfrm6_xlat_addr *xla);
+int xfrm6_xlat_addr(struct sk_buff *skb);
+int xfrm6_xlat_addr_init(void);
+void xfrm6_xlat_addr_fini(void);
+#else
+static inline int xfrm6_xlat_addr(struct sk_buff *skb)
+{
+ return 0;
+}
+
+static inline int xfrm6_xlat_addr_init(void)
+{
+ return 0;
+}
+
+static inline void xfrm6_xlat_addr_fini(void) { }
+#endif
+
struct xfrm_tunnel_skb_cb {
union {
struct inet_skb_parm h4;
diff --git a/net/ipv6/Kconfig b/net/ipv6/Kconfig
index 983bb99..6e8ca06 100644
--- a/net/ipv6/Kconfig
+++ b/net/ipv6/Kconfig
@@ -153,6 +153,10 @@ config INET6_XFRM_MODE_ROUTEOPTIMIZATION
---help---
Support for MIPv6 route optimization mode.
+config INET6_XFRM_XLAT_ADDR
+ select XFRM
+ bool
+
config IPV6_VTI
tristate "Virtual (secure) IPv6: tunneling"
select IPV6_TUNNEL
diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile
index 2fbd90b..c719d6f 100644
--- a/net/ipv6/Makefile
+++ b/net/ipv6/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_INET6_XFRM_MODE_TRANSPORT) += xfrm6_mode_transport.o
obj-$(CONFIG_INET6_XFRM_MODE_TUNNEL) += xfrm6_mode_tunnel.o
obj-$(CONFIG_INET6_XFRM_MODE_ROUTEOPTIMIZATION) += xfrm6_mode_ro.o
obj-$(CONFIG_INET6_XFRM_MODE_BEET) += xfrm6_mode_beet.o
+obj-$(CONFIG_INET6_XFRM_XLAT_ADDR) += xfrm6_xlat_addr.o
obj-$(CONFIG_IPV6_MIP6) += mip6.o
obj-$(CONFIG_IPV6_ILA) += ila/
obj-$(CONFIG_NETFILTER) += netfilter/
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index 30caa28..81b9079 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -390,11 +390,17 @@ int __init xfrm6_init(void)
if (ret)
goto out_state;
+ ret = xfrm6_xlat_addr_init();
+ if (ret)
+ goto out_protocol;
+
#ifdef CONFIG_SYSCTL
register_pernet_subsys(&xfrm6_net_ops);
#endif
out:
return ret;
+out_protocol:
+ xfrm6_protocol_fini();
out_state:
xfrm6_state_fini();
out_policy:
@@ -407,6 +413,7 @@ void xfrm6_fini(void)
#ifdef CONFIG_SYSCTL
unregister_pernet_subsys(&xfrm6_net_ops);
#endif
+ xfrm6_xlat_addr_fini();
xfrm6_protocol_fini();
xfrm6_policy_fini();
xfrm6_state_fini();
diff --git a/net/ipv6/xfrm6_xlat_addr.c b/net/ipv6/xfrm6_xlat_addr.c
new file mode 100644
index 0000000..dd2199a
--- /dev/null
+++ b/net/ipv6/xfrm6_xlat_addr.c
@@ -0,0 +1,66 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <net/ipv6.h>
+#include <net/xfrm.h>
+
+static struct list_head xfrm6_xlat_addr_head __read_mostly;
+static DEFINE_SPINLOCK(xfrm6_xlat_addr_lock);
+
+void xfrm6_xlat_addr_add(struct xfrm6_xlat_addr *xla)
+{
+ spin_lock(&xfrm6_xlat_addr_lock);
+ list_add_rcu(&xla->list, &xfrm6_xlat_addr_head);
+ spin_unlock(&xfrm6_xlat_addr_lock);
+}
+EXPORT_SYMBOL(xfrm6_xlat_addr_add);
+
+void xfrm6_xlat_addr_del(struct xfrm6_xlat_addr *xla)
+{
+ struct xfrm6_xlat_addr *tmp;
+
+ spin_lock(&xfrm6_xlat_addr_lock);
+
+ list_for_each_entry_rcu(tmp, &xfrm6_xlat_addr_head, list) {
+ if (xla == tmp) {
+ list_del_rcu(&xla->list);
+ goto out;
+ }
+ }
+
+ pr_warn("xfrm6_xlat_addr_del: %p not found\n", xla);
+out:
+ spin_unlock(&xfrm6_xlat_addr_lock);
+}
+EXPORT_SYMBOL(xfrm6_xlat_addr_del);
+
+int xfrm6_xlat_addr(struct sk_buff *skb)
+{
+ struct xfrm6_xlat_addr *xla;
+ int err = 0;
+
+ rcu_read_lock();
+
+ list_for_each_entry_rcu(xla, &xfrm6_xlat_addr_head, list) {
+ err = xla->xlat(skb);
+ if (err < 0)
+ break;
+ }
+
+ rcu_read_unlock();
+
+ return err;
+}
+EXPORT_SYMBOL(xfrm6_xlat_addr);
+
+int __init xfrm6_xlat_addr_init(void)
+{
+ INIT_LIST_HEAD(&xfrm6_xlat_addr_head);
+
+ return 0;
+}
+
+void xfrm6_xlat_addr_fini(void)
+{
+}
+
--
2.4.6
--
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