[XFRM]: Fix aevent structuring to be more complete.

aevents can not uniquely identify an SA. We break the ABI with this
patch, but consensus is that since it is not yet utilized by any
(known) application then it is fine (better do it now than later).

Signed-off-by: Jamal Hadi Salim <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

Documentation/networking/xfrm_sync.txt

···
 
    struct xfrm_aevent_id {
              struct xfrm_usersa_id           sa_id;
+             xfrm_address_t                  saddr;
              __u32                           flags;
+             __u32                           reqid;
    };
 
-xfrm_usersa_id in this message layout identifies the SA.
+The unique SA is identified by the combination of xfrm_usersa_id,
+reqid and saddr.
 
 flags are used to indicate different things. The possible
 flags are:

include/linux/xfrm.h

···
 
 struct xfrm_aevent_id {
 	struct xfrm_usersa_id		sa_id;
+	xfrm_address_t			saddr;
 	__u32				flags;
+	__u32				reqid;
 };
 
 struct xfrm_userspi_info {

net/xfrm/xfrm_user.c

···
 	id = NLMSG_DATA(nlh);
 	nlh->nlmsg_flags = 0;
 
-	id->sa_id.daddr = x->id.daddr;
+	memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
 	id->sa_id.spi = x->id.spi;
 	id->sa_id.family = x->props.family;
 	id->sa_id.proto = x->id.proto;
+	memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
+	id->reqid = x->props.reqid;
 	id->flags = c->data.aevent;
 
 	RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);