xfrm: Use separate low and high order bits of the sequence numbers in xfrm_skb_cb

To support IPsec extended sequence numbers, we split the
output sequence numbers of xfrm_skb_cb in low and high order 32 bits
and we add the high order 32 bits to the input sequence numbers.
All users are updated accordingly.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/xfrm.h

@@ -582,8 +582,14 @@ struct xfrm_skb_cb {
 
         /* Sequence number for replay protection. */
 	union {
-		u64 output;
-		__be32 input;
+		struct {
+			__u32 low;
+			__u32 hi;
+		} output;
+		struct {
+			__be32 low;
+			__be32 hi;
+		} input;
 	} seq;
 };
 

net/ipv4/ah4.c

@@ -208,7 +208,7 @@ static int ah_output(struct xfrm_state *x, struct sk_buff *skb)
 
 	ah->reserved = 0;
 	ah->spi = x->id.spi;
-	ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output);
+	ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
 
 	sg_init_table(sg, nfrags);
 	skb_to_sgvec(skb, sg, 0, skb->len);

net/ipv4/esp4.c

@@ -215,7 +215,7 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
 	}
 
 	esph->spi = x->id.spi;
-	esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output);
+	esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
 
 	sg_init_table(sg, nfrags);
 	skb_to_sgvec(skb, sg,
@@ -227,7 +227,7 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
 	aead_givcrypt_set_crypt(req, sg, sg, clen, iv);
 	aead_givcrypt_set_assoc(req, asg, sizeof(*esph));
 	aead_givcrypt_set_giv(req, esph->enc_data,
-			      XFRM_SKB_CB(skb)->seq.output);
+			      XFRM_SKB_CB(skb)->seq.output.low);
 
 	ESP_SKB_CB(skb)->tmp = tmp;
 	err = crypto_aead_givencrypt(req);

net/ipv6/ah6.c

@@ -409,7 +409,7 @@ static int ah6_output(struct xfrm_state *x, struct sk_buff *skb)
 
 	ah->reserved = 0;
 	ah->spi = x->id.spi;
-	ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output);
+	ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
 
 	sg_init_table(sg, nfrags);
 	skb_to_sgvec(skb, sg, 0, skb->len);

net/ipv6/esp6.c

@@ -204,7 +204,7 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
 	*skb_mac_header(skb) = IPPROTO_ESP;
 
 	esph->spi = x->id.spi;
-	esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output);
+	esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
 
 	sg_init_table(sg, nfrags);
 	skb_to_sgvec(skb, sg,
@@ -216,7 +216,7 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
 	aead_givcrypt_set_crypt(req, sg, sg, clen, iv);
 	aead_givcrypt_set_assoc(req, asg, sizeof(*esph));
 	aead_givcrypt_set_giv(req, esph->enc_data,
-			      XFRM_SKB_CB(skb)->seq.output);
+			      XFRM_SKB_CB(skb)->seq.output.low);
 
 	ESP_SKB_CB(skb)->tmp = tmp;
 	err = crypto_aead_givencrypt(req);

net/xfrm/xfrm_input.c

@@ -118,7 +118,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
 	if (encap_type < 0) {
 		async = 1;
 		x = xfrm_input_state(skb);
-		seq = XFRM_SKB_CB(skb)->seq.input;
+		seq = XFRM_SKB_CB(skb)->seq.input.low;
 		goto resume;
 	}
 
@@ -184,7 +184,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
 
 		spin_unlock(&x->lock);
 
-		XFRM_SKB_CB(skb)->seq.input = seq;
+		XFRM_SKB_CB(skb)->seq.input.low = seq;
 
 		nexthdr = x->type->input(x, skb);
 

net/xfrm/xfrm_output.c

@@ -68,7 +68,7 @@ static int xfrm_output_one(struct sk_buff *skb, int err)
 		}
 
 		if (x->type->flags & XFRM_TYPE_REPLAY_PROT) {
-			XFRM_SKB_CB(skb)->seq.output = ++x->replay.oseq;
+			XFRM_SKB_CB(skb)->seq.output.low = ++x->replay.oseq;
 			if (unlikely(x->replay.oseq == 0)) {
 				XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATESEQERROR);
 				x->replay.oseq--;