xfrm: MIGRATE enhancements (draft-ebalard-mext-pfkey-enhanced-migrate)

Provides implementation of the enhancements of XFRM/PF_KEY MIGRATE mechanism
specified in draft-ebalard-mext-pfkey-enhanced-migrate-00. Defines associated
PF_KEY SADB_X_EXT_KMADDRESS extension and XFRM/netlink XFRMA_KMADDRESS
attribute.

Signed-off-by: Arnaud Ebalard <arno@natisbad.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 34 insertions, 4 deletions

diff --git a/include/linux/pfkeyv2.h b/include/linux/pfkeyv2.h
index 700725ddcaae..01b262959f2e 100644
--- a/include/linux/pfkeyv2.h
+++ b/include/linux/pfkeyv2.h
@@ -226,6 +226,15 @@ struct sadb_x_sec_ctx {
 } __attribute__((packed));
 /* sizeof(struct sadb_sec_ctx) = 8 */
 
+/* Used by MIGRATE to pass addresses IKE will use to perform
+ * negotiation with the peer */
+struct sadb_x_kmaddress {
+        uint16_t        sadb_x_kmaddress_len;
+        uint16_t        sadb_x_kmaddress_exttype;
+        uint32_t        sadb_x_kmaddress_reserved;
+} __attribute__((packed));
+/* sizeof(struct sadb_x_kmaddress) == 8 */
+
 /* Message types */
 #define SADB_RESERVED           0
 #define SADB_GETSPI             1
@@ -346,7 +355,9 @@ struct sadb_x_sec_ctx {
 #define SADB_X_EXT_NAT_T_DPORT          22
 #define SADB_X_EXT_NAT_T_OA             23
 #define SADB_X_EXT_SEC_CTX              24
-#define SADB_EXT_MAX                    24
+/* Used with MIGRATE to pass @ to IKE for negotiation */
+#define SADB_X_EXT_KMADDRESS            25
+#define SADB_EXT_MAX                    25
 
 /* Identity Extension values */
 #define SADB_IDENTTYPE_RESERVED 0
diff --git a/include/linux/xfrm.h b/include/linux/xfrm.h
index fb0c215a3051..4bc1e6b86cb2 100644
--- a/include/linux/xfrm.h
+++ b/include/linux/xfrm.h
@@ -279,6 +279,7 @@ enum xfrm_attr_type_t {
         XFRMA_POLICY_TYPE,      /* struct xfrm_userpolicy_type */
         XFRMA_MIGRATE,
         XFRMA_ALG_AEAD,         /* struct xfrm_algo_aead */
+        XFRMA_KMADDRESS,        /* struct xfrm_user_kmaddress */
         __XFRMA_MAX
 
 #define XFRMA_MAX (__XFRMA_MAX - 1)
@@ -415,6 +416,15 @@ struct xfrm_user_report {
         struct xfrm_selector            sel;
 };
 
+/* Used by MIGRATE to pass addresses IKE should use to perform
+ * SA negotiation with the peer */
+struct xfrm_user_kmaddress {
+        xfrm_address_t                  local;
+        xfrm_address_t                  remote;
+        __u32                           reserved;
+        __u16                           family;
+};
+
 struct xfrm_user_migrate {
         xfrm_address_t                  old_daddr;
         xfrm_address_t                  old_saddr;
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index b98d2056f27f..11c890ad8ebb 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -492,6 +492,13 @@ struct xfrm_policy
         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
 };
 
+struct xfrm_kmaddress {
+        xfrm_address_t          local;
+        xfrm_address_t          remote;
+        u32                     reserved;
+        u16                     family;
+};
+
 struct xfrm_migrate {
         xfrm_address_t          old_daddr;
         xfrm_address_t          old_saddr;
@@ -531,7 +538,7 @@ 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);
+        int                     (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
 };
 
 extern int xfrm_register_km(struct xfrm_mgr *km);
@@ -1432,12 +1439,14 @@ extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
 
 #ifdef CONFIG_XFRM_MIGRATE
 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
-                      struct xfrm_migrate *m, int num_bundles);
+                      struct xfrm_migrate *m, int num_bundles,
+                      struct xfrm_kmaddress *k);
 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);
+                        struct xfrm_migrate *m, int num_bundles,
+                        struct xfrm_kmaddress *k);
 #endif
 
 extern wait_queue_head_t km_waitq;