Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next

Steffen Klassert says:

====================
pull request (net-next): ipsec-next 2017-09-01

This should be the last ipsec-next pull request for this
release cycle:

1) Support netdevice ESP trailer removal when decryption
   is offloaded. From Yossi Kuperman.

2) Fix overwritten return value of copy_sec_ctx().

Please pull or let me know if there are problems.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/xfrm.h

@@ -1019,6 +1019,7 @@ struct xfrm_offload {
 #define	CRYPTO_FALLBACK		8
 #define	XFRM_GSO_SEGMENT	16
 #define	XFRM_GRO		32
+#define	XFRM_ESP_NO_TRAILER	64
 
 	__u32			status;
 #define CRYPTO_SUCCESS				1

net/ipv4/esp4.c

@@ -499,19 +499,59 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
 	return esp_output_tail(x, skb, &esp);
 }
 
+static inline int esp_remove_trailer(struct sk_buff *skb)
+{
+	struct xfrm_state *x = xfrm_input_state(skb);
+	struct xfrm_offload *xo = xfrm_offload(skb);
+	struct crypto_aead *aead = x->data;
+	int alen, hlen, elen;
+	int padlen, trimlen;
+	__wsum csumdiff;
+	u8 nexthdr[2];
+	int ret;
+
+	alen = crypto_aead_authsize(aead);
+	hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
+	elen = skb->len - hlen;
+
+	if (xo && (xo->flags & XFRM_ESP_NO_TRAILER)) {
+		ret = xo->proto;
+		goto out;
+	}
+
+	if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2))
+		BUG();
+
+	ret = -EINVAL;
+	padlen = nexthdr[0];
+	if (padlen + 2 + alen >= elen) {
+		net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n",
+				    padlen + 2, elen - alen);
+		goto out;
+	}
+
+	trimlen = alen + padlen + 2;
+	if (skb->ip_summed == CHECKSUM_COMPLETE) {
+		csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0);
+		skb->csum = csum_block_sub(skb->csum, csumdiff,
+					   skb->len - trimlen);
+	}
+	pskb_trim(skb, skb->len - trimlen);
+
+	ret = nexthdr[1];
+
+out:
+	return ret;
+}
+
 int esp_input_done2(struct sk_buff *skb, int err)
 {
 	const struct iphdr *iph;
 	struct xfrm_state *x = xfrm_input_state(skb);
 	struct xfrm_offload *xo = xfrm_offload(skb);
 	struct crypto_aead *aead = x->data;
-	int alen = crypto_aead_authsize(aead);
 	int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
-	int elen = skb->len - hlen;
 	int ihl;
-	u8 nexthdr[2];
-	int padlen, trimlen;
-	__wsum csumdiff;
 
 	if (!xo || (xo && !(xo->flags & CRYPTO_DONE)))
 		kfree(ESP_SKB_CB(skb)->tmp);
@@ -519,16 +559,10 @@ int esp_input_done2(struct sk_buff *skb, int err)
 	if (unlikely(err))
 		goto out;
 
-	if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2))
-		BUG();
-
-	err = -EINVAL;
-	padlen = nexthdr[0];
-	if (padlen + 2 + alen >= elen)
+	err = esp_remove_trailer(skb);
+	if (unlikely(err < 0))
 		goto out;
 
-	/* ... check padding bits here. Silly. :-) */
-
 	iph = ip_hdr(skb);
 	ihl = iph->ihl * 4;
 
@@ -569,22 +603,12 @@ int esp_input_done2(struct sk_buff *skb, int err)
 			skb->ip_summed = CHECKSUM_UNNECESSARY;
 	}
 
-	trimlen = alen + padlen + 2;
-	if (skb->ip_summed == CHECKSUM_COMPLETE) {
-		csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0);
-		skb->csum = csum_block_sub(skb->csum, csumdiff,
-					   skb->len - trimlen);
-	}
-	pskb_trim(skb, skb->len - trimlen);
-
 	skb_pull_rcsum(skb, hlen);
 	if (x->props.mode == XFRM_MODE_TUNNEL)
 		skb_reset_transport_header(skb);
 	else
 		skb_set_transport_header(skb, -ihl);
 
-	err = nexthdr[1];
-
 	/* RFC4303: Drop dummy packets without any error */
 	if (err == IPPROTO_NONE)
 		err = -EINVAL;

net/ipv6/esp6.c

@@ -461,29 +461,30 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
 	return esp6_output_tail(x, skb, &esp);
 }
 
-int esp6_input_done2(struct sk_buff *skb, int err)
+static inline int esp_remove_trailer(struct sk_buff *skb)
 {
 	struct xfrm_state *x = xfrm_input_state(skb);
 	struct xfrm_offload *xo = xfrm_offload(skb);
 	struct crypto_aead *aead = x->data;
-	int alen = crypto_aead_authsize(aead);
-	int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
-	int elen = skb->len - hlen;
-	int hdr_len = skb_network_header_len(skb);
+	int alen, hlen, elen;
 	int padlen, trimlen;
 	__wsum csumdiff;
 	u8 nexthdr[2];
+	int ret;
 
-	if (!xo || (xo && !(xo->flags & CRYPTO_DONE)))
-		kfree(ESP_SKB_CB(skb)->tmp);
+	alen = crypto_aead_authsize(aead);
+	hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
+	elen = skb->len - hlen;
 
-	if (unlikely(err))
+	if (xo && (xo->flags & XFRM_ESP_NO_TRAILER)) {
+		ret = xo->proto;
 		goto out;
+	}
 
 	if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2))
 		BUG();
 
-	err = -EINVAL;
+	ret = -EINVAL;
 	padlen = nexthdr[0];
 	if (padlen + 2 + alen >= elen) {
 		net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n",
@@ -491,26 +492,46 @@ int esp6_input_done2(struct sk_buff *skb, int err)
 		goto out;
 	}
 
-	/* ... check padding bits here. Silly. :-) */
-
 	trimlen = alen + padlen + 2;
 	if (skb->ip_summed == CHECKSUM_COMPLETE) {
-		skb_postpull_rcsum(skb, skb_network_header(skb),
-				   skb_network_header_len(skb));
 		csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0);
 		skb->csum = csum_block_sub(skb->csum, csumdiff,
 					   skb->len - trimlen);
 	}
 	pskb_trim(skb, skb->len - trimlen);
 
+	ret = nexthdr[1];
+
+out:
+	return ret;
+}
+
+int esp6_input_done2(struct sk_buff *skb, int err)
+{
+	struct xfrm_state *x = xfrm_input_state(skb);
+	struct xfrm_offload *xo = xfrm_offload(skb);
+	struct crypto_aead *aead = x->data;
+	int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
+	int hdr_len = skb_network_header_len(skb);
+
+	if (!xo || (xo && !(xo->flags & CRYPTO_DONE)))
+		kfree(ESP_SKB_CB(skb)->tmp);
+
+	if (unlikely(err))
+		goto out;
+
+	err = esp_remove_trailer(skb);
+	if (unlikely(err < 0))
+		goto out;
+
+	skb_postpull_rcsum(skb, skb_network_header(skb),
+			   skb_network_header_len(skb));
 	skb_pull_rcsum(skb, hlen);
 	if (x->props.mode == XFRM_MODE_TUNNEL)
 		skb_reset_transport_header(skb);
 	else
 		skb_set_transport_header(skb, -hdr_len);
 
-	err = nexthdr[1];
-
 	/* RFC4303: Drop dummy packets without any error */
 	if (err == IPPROTO_NONE)
 		err = -EINVAL;

net/xfrm/xfrm_input.c

@@ -247,6 +247,11 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
 					goto drop;
 				}
 
+				if (xo->status & CRYPTO_INVALID_PROTOCOL) {
+					XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
+					goto drop;
+				}
+
 				XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
 				goto drop;
 			}

net/xfrm/xfrm_user.c

@@ -900,13 +900,13 @@ static int copy_to_user_state_extra(struct xfrm_state *x,
 		ret = copy_user_offload(&x->xso, skb);
 	if (ret)
 		goto out;
-	if (x->security)
-		ret = copy_sec_ctx(x->security, skb);
 	if (x->props.output_mark) {
 		ret = nla_put_u32(skb, XFRMA_OUTPUT_MARK, x->props.output_mark);
 		if (ret)
 			goto out;
 	}
+	if (x->security)
+		ret = copy_sec_ctx(x->security, skb);
 out:
 	return ret;
 }