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Commit 34166093 authored by Mike Rapoport's avatar Mike Rapoport Committed by David S. Miller
Browse files

tuntap: use common code for virtio_net_hdr and skb GSO conversion 



Replace open coded conversion between virtio_net_hdr to skb GSO info with
virtio_net_hdr_{from,to}_skb

Signed-off-by: default avatarMike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent fd88d68b

drivers/net/tun.c

+21 −76
Original line number Diff line number Diff line
@@ -1254,15 +1254,6 @@ 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) {

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

					  tun16_to_cpu(tun, gso.csum_offset))) {

			this_cpu_inc(tun->pcpu_stats->rx_frame_errors);

			kfree_skb(skb);

			return -EINVAL;

		}

	}



	switch (tun->flags & TUN_TYPE_MASK) {

	case IFF_TUN:

		if (tun->flags & IFF_NO_PI) {
@@ -1289,39 +1280,13 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, 
		break;

	}



	if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) {

		pr_debug("GSO!\n");

		switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {

		case VIRTIO_NET_HDR_GSO_TCPV4:

			skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;

			break;

		case VIRTIO_NET_HDR_GSO_TCPV6:

			skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;

			break;

		case VIRTIO_NET_HDR_GSO_UDP:

			skb_shinfo(skb)->gso_type = SKB_GSO_UDP;

			break;

		default:

			this_cpu_inc(tun->pcpu_stats->rx_frame_errors);

			kfree_skb(skb);

			return -EINVAL;

		}



		if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN)

			skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;



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

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

	err = virtio_net_hdr_to_skb(skb, &gso, tun_is_little_endian(tun));

	if (err) {

		this_cpu_inc(tun->pcpu_stats->rx_frame_errors);

		kfree_skb(skb);

		return -EINVAL;

	}



		/* Header must be checked, and gso_segs computed. */

		skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;

		skb_shinfo(skb)->gso_segs = 0;

	}



	/* copy skb_ubuf_info for callback when skb has no error */

	if (zerocopy) {

		skb_shinfo(skb)->destructor_arg = msg_control;
@@ -1399,22 +1364,15 @@ static ssize_t tun_put_user(struct tun_struct *tun, 


	if (vnet_hdr_sz) {

		struct virtio_net_hdr gso = { 0 }; /* no info leak */

		int ret;



		if (iov_iter_count(iter) < vnet_hdr_sz)

			return -EINVAL;



		if (skb_is_gso(skb)) {

		ret = virtio_net_hdr_from_skb(skb, &gso,

					      tun_is_little_endian(tun));

		if (ret) {

			struct skb_shared_info *sinfo = skb_shinfo(skb);



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

			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)

				gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;

			else if (sinfo->gso_type & SKB_GSO_UDP)

				gso.gso_type = VIRTIO_NET_HDR_GSO_UDP;

			else {

			pr_err("unexpected GSO type: "

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

			       sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size),
@@ -1426,19 +1384,6 @@ static ssize_t tun_put_user(struct tun_struct *tun, 
			WARN_ON_ONCE(1);

			return -EINVAL;

		}

			if (sinfo->gso_type & SKB_GSO_TCP_ECN)

				gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN;

		} else

			gso.gso_type = VIRTIO_NET_HDR_GSO_NONE;



		if (skb->ip_summed == CHECKSUM_PARTIAL) {

			gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;

			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 */



		if (copy_to_iter(&gso, sizeof(gso), iter) != sizeof(gso))

			return -EFAULT;