UPSTREAM: xfrm/compat: Add 64=>32-bit messages translator
Provide the kernel-to-user translator under XFRM_USER_COMPAT, that
creates for 64-bit xfrm-user message a 32-bit translation and puts it
in skb's frag_list. net/compat.c layer provides MSG_CMSG_COMPAT to
decide if the message should be taken from skb or frag_list.
(used by wext-core which has also an ABI difference)
Kernel sends 64-bit xfrm messages to the userspace for:
- multicast (monitor events)
- netlink dumps
Wire up the translator to xfrm_nlmsg_multicast().
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
(cherry picked from commit 5461fc0c8d9f23956b99f5907f69726a293ccb67)
Bug: 163141236
Signed-off-by: Alistair Delva <adelva@google.com>
Change-Id: Id8b59587d60feb9b9f0ce96be9d140d694573fe3
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 81926c4..44975df 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -2094,7 +2094,12 @@
return 0;
}
+extern const int xfrm_msg_min[XFRM_NR_MSGTYPES];
+
struct xfrm_translator {
+ /* Allocate frag_list and put compat translation there */
+ int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src);
+
struct module *owner;
};