Commit 56f0dcc5 authored by Michael S. Tsirkin's avatar Michael S. Tsirkin
Browse files

tun: TUN_VNET_LE support, fix sparse warnings for virtio headers 



Pretty straight-forward: convert all fields to/from
virtio endian-ness.

Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Reviewed-by: default avatarJason Wang <jasowang@redhat.com>
parent e999d6ea

drivers/net/tun.c

+29 −19
Original line number Diff line number Diff line
@@ -111,7 +111,7 @@ do { \ 
#define TUN_FASYNC	IFF_ATTACH_QUEUE



#define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \

		      IFF_MULTI_QUEUE)

		      IFF_VNET_LE | IFF_MULTI_QUEUE)

#define GOODCOPY_LEN 128



#define FLT_EXACT_COUNT 8
@@ -205,6 +205,16 @@ struct tun_struct { 
	u32 flow_count;

};



static inline u16 tun16_to_cpu(struct tun_struct *tun, __virtio16 val)

{

	return __virtio16_to_cpu(tun->flags & IFF_VNET_LE, val);

}



static inline __virtio16 cpu_to_tun16(struct tun_struct *tun, u16 val)

{

	return __cpu_to_virtio16(tun->flags & IFF_VNET_LE, val);

}



static inline u32 tun_hashfn(u32 rxhash)

{

	return rxhash & 0x3ff;
@@ -1053,10 +1063,10 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, 
			return -EFAULT;



		if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&

		    gso.csum_start + gso.csum_offset + 2 > gso.hdr_len)

			gso.hdr_len = gso.csum_start + gso.csum_offset + 2;

		    tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2 > tun16_to_cpu(tun, gso.hdr_len))

			gso.hdr_len = cpu_to_tun16(tun, tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2);



		if (gso.hdr_len > len)

		if (tun16_to_cpu(tun, gso.hdr_len) > len)

			return -EINVAL;

		offset += tun->vnet_hdr_sz;

	}
@@ -1064,7 +1074,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, 
	if ((tun->flags & TUN_TYPE_MASK) == IFF_TAP) {

		align += NET_IP_ALIGN;

		if (unlikely(len < ETH_HLEN ||

			     (gso.hdr_len && gso.hdr_len < ETH_HLEN)))

			     (gso.hdr_len && tun16_to_cpu(tun, gso.hdr_len) < ETH_HLEN)))

			return -EINVAL;

	}
@@ -1075,7 +1085,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, 
		 * enough room for skb expand head in case it is used.

		 * The rest of the buffer is mapped from userspace.

		 */

		copylen = gso.hdr_len ? gso.hdr_len : GOODCOPY_LEN;

		copylen = gso.hdr_len ? tun16_to_cpu(tun, gso.hdr_len) : GOODCOPY_LEN;

		if (copylen > good_linear)

			copylen = good_linear;

		linear = copylen;
@@ -1085,10 +1095,10 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, 


	if (!zerocopy) {

		copylen = len;

		if (gso.hdr_len > good_linear)

		if (tun16_to_cpu(tun, gso.hdr_len) > good_linear)

			linear = good_linear;

		else

			linear = gso.hdr_len;

			linear = tun16_to_cpu(tun, gso.hdr_len);

	}



	skb = tun_alloc_skb(tfile, align, copylen, linear, noblock);
@@ -1115,8 +1125,8 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, 
	}



	if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {

		if (!skb_partial_csum_set(skb, gso.csum_start,

					  gso.csum_offset)) {

		if (!skb_partial_csum_set(skb, tun16_to_cpu(tun, gso.csum_start),

					  tun16_to_cpu(tun, gso.csum_offset))) {

			tun->dev->stats.rx_frame_errors++;

			kfree_skb(skb);

			return -EINVAL;
@@ -1184,7 +1194,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, 
		if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN)

			skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;



		skb_shinfo(skb)->gso_size = gso.gso_size;

		skb_shinfo(skb)->gso_size = tun16_to_cpu(tun, gso.gso_size);

		if (skb_shinfo(skb)->gso_size == 0) {

			tun->dev->stats.rx_frame_errors++;

			kfree_skb(skb);
@@ -1276,8 +1286,8 @@ static ssize_t tun_put_user(struct tun_struct *tun, 
			struct skb_shared_info *sinfo = skb_shinfo(skb);



			/* This is a hint as to how much should be linear. */

			gso.hdr_len = skb_headlen(skb);

			gso.gso_size = sinfo->gso_size;

			gso.hdr_len = cpu_to_tun16(tun, skb_headlen(skb));

			gso.gso_size = cpu_to_tun16(tun, sinfo->gso_size);

			if (sinfo->gso_type & SKB_GSO_TCPV4)

				gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;

			else if (sinfo->gso_type & SKB_GSO_TCPV6)
@@ -1285,12 +1295,12 @@ static ssize_t tun_put_user(struct tun_struct *tun, 
			else {

				pr_err("unexpected GSO type: "

				       "0x%x, gso_size %d, hdr_len %d\n",

				       sinfo->gso_type, gso.gso_size,

				       gso.hdr_len);

				       sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size),

				       tun16_to_cpu(tun, gso.hdr_len));

				print_hex_dump(KERN_ERR, "tun: ",

					       DUMP_PREFIX_NONE,

					       16, 1, skb->head,

					       min((int)gso.hdr_len, 64), true);

					       min((int)tun16_to_cpu(tun, gso.hdr_len), 64), true);

				WARN_ON_ONCE(1);

				return -EINVAL;

			}
@@ -1301,9 +1311,9 @@ static ssize_t tun_put_user(struct tun_struct *tun, 


		if (skb->ip_summed == CHECKSUM_PARTIAL) {

			gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;

			gso.csum_start = skb_checksum_start_offset(skb) +

					 vlan_hlen;

			gso.csum_offset = skb->csum_offset;

			gso.csum_start = cpu_to_tun16(tun, skb_checksum_start_offset(skb) +

						      vlan_hlen);

			gso.csum_offset = cpu_to_tun16(tun, skb->csum_offset);

		} else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {

			gso.flags = VIRTIO_NET_HDR_F_DATA_VALID;

		} /* else everything is zero */

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