[XFRM]: Extension for dynamic update of endpoint address(es)

Extend the XFRM framework so that endpoint address(es) in the XFRM
databases could be dynamically updated according to a request (MIGRATE
message) from user application. Target XFRM policy is first identified
by the selector in the MIGRATE message. Next, the endpoint addresses
of the matching templates and XFRM states are updated according to
the MIGRATE message.

Signed-off-by: Shinta Sugimoto <shinta.sugimoto@ericsson.com>
Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 63 insertions, 0 deletions

diff --git a/include/linux/xfrm.h b/include/linux/xfrm.h
index 9529ea1ae392..15ca89e9961b 100644
--- a/include/linux/xfrm.h
+++ b/include/linux/xfrm.h
@@ -178,6 +178,9 @@ enum {
 	XFRM_MSG_REPORT,
 #define XFRM_MSG_REPORT XFRM_MSG_REPORT
 
+	XFRM_MSG_MIGRATE,
+#define XFRM_MSG_MIGRATE XFRM_MSG_MIGRATE
+
 	__XFRM_MSG_MAX
 };
 #define XFRM_MSG_MAX (__XFRM_MSG_MAX - 1)
@@ -256,6 +259,7 @@ enum xfrm_attr_type_t {
 	XFRMA_COADDR,		/* xfrm_address_t */
 	XFRMA_LASTUSED,
 	XFRMA_POLICY_TYPE,	/* struct xfrm_userpolicy_type */
+	XFRMA_MIGRATE,
 	__XFRMA_MAX
 
 #define XFRMA_MAX (__XFRMA_MAX - 1)
@@ -351,6 +355,19 @@ struct xfrm_user_report {
 	struct xfrm_selector		sel;
 };
 
+struct xfrm_user_migrate {
+	xfrm_address_t			old_daddr;
+	xfrm_address_t			old_saddr;
+	xfrm_address_t			new_daddr;
+	xfrm_address_t			new_saddr;
+	__u8				proto;
+	__u8				mode;
+	__u16				reserved;
+	__u32				reqid;
+	__u16				old_family;
+	__u16				new_family;
+};
+
 #ifndef __KERNEL__
 /* backwards compatibility for userspace */
 #define XFRMGRP_ACQUIRE		1
@@ -375,6 +392,8 @@ enum xfrm_nlgroups {
 #define XFRMNLGRP_AEVENTS	XFRMNLGRP_AEVENTS
 	XFRMNLGRP_REPORT,
 #define XFRMNLGRP_REPORT	XFRMNLGRP_REPORT
+	XFRMNLGRP_MIGRATE,
+#define XFRMNLGRP_MIGRATE	XFRMNLGRP_MIGRATE
 	__XFRMNLGRP_MAX
 };
 #define XFRMNLGRP_MAX	(__XFRMNLGRP_MAX - 1)
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index bf91d632901d..16924cb772c9 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -362,6 +362,19 @@ struct xfrm_policy
 	struct xfrm_tmpl       	xfrm_vec[XFRM_MAX_DEPTH];
 };
 
+struct xfrm_migrate {
+	xfrm_address_t		old_daddr;
+	xfrm_address_t		old_saddr;
+	xfrm_address_t		new_daddr;
+	xfrm_address_t		new_saddr;
+	u8			proto;
+	u8			mode;
+	u16			reserved;
+	u32			reqid;
+	u16			old_family;
+	u16			new_family;
+};
+
 #define XFRM_KM_TIMEOUT                30
 /* which seqno */
 #define XFRM_REPLAY_SEQ		1
@@ -388,6 +401,7 @@ struct xfrm_mgr
 	int			(*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
 	int			(*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
 	int			(*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
+	int			(*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
 };
 
 extern int xfrm_register_km(struct xfrm_mgr *km);
@@ -988,6 +1002,16 @@ extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
 			  struct flowi *fl, int family, int strict);
 extern void xfrm_init_pmtu(struct dst_entry *dst);
 
+#ifdef CONFIG_XFRM_MIGRATE
+extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
+		      struct xfrm_migrate *m, int num_bundles);
+extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
+extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
+					      struct xfrm_migrate *m);
+extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
+			struct xfrm_migrate *m, int num_bundles);
+#endif
+
 extern wait_queue_head_t km_waitq;
 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
@@ -1053,5 +1077,25 @@ static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
 		xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
 }
 
+#ifdef CONFIG_XFRM_MIGRATE
+static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
+{
+	return (struct xfrm_algo *)kmemdup(orig, sizeof(*orig) + orig->alg_key_len, GFP_KERNEL);
+}
+
+static inline void xfrm_states_put(struct xfrm_state **states, int n)
+{
+	int i;
+	for (i = 0; i < n; i++)
+		xfrm_state_put(*(states + i));
+}
+
+static inline void xfrm_states_delete(struct xfrm_state **states, int n)
+{
+	int i;
+	for (i = 0; i < n; i++)
+		xfrm_state_delete(*(states + i));
+}
+#endif
 
 #endif	/* _NET_XFRM_H */