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fd3a886258
Tun, tap, virtio, packet and uml vector all use struct virtio_net_hdr to communicate packet metadata to userspace. For skbuffs with vlan, the first two return the packet as it may have existed on the wire, inserting the VLAN tag in the user buffer. Then virtio_net_hdr.csum_start needs to be adjusted by VLAN_HLEN bytes. Commitf09e2249c4("macvtap: restore vlan header on user read") added this feature to macvtap. Commit3ce9b20f19("macvtap: Fix csum_start when VLAN tags are present") then fixed up csum_start. Virtio, packet and uml do not insert the vlan header in the user buffer. When introducing virtio_net_hdr_from_skb to deduplicate filling in the virtio_net_hdr, the variant from macvtap which adds VLAN_HLEN was applied uniformly, breaking csum offset for packets with vlan on virtio and packet. Make insertion of VLAN_HLEN optional. Convert the callers to pass it when needed. Fixes:e858fae2b0("virtio_net: use common code for virtio_net_hdr and skb GSO conversion") Fixes:1276f24eee("packet: use common code for virtio_net_hdr and skb GSO conversion") Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_VIRTIO_NET_H
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#define _LINUX_VIRTIO_NET_H
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#include <linux/if_vlan.h>
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#include <uapi/linux/virtio_net.h>
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static inline int virtio_net_hdr_to_skb(struct sk_buff *skb,
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const struct virtio_net_hdr *hdr,
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bool little_endian)
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{
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unsigned int gso_type = 0;
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if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
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switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
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case VIRTIO_NET_HDR_GSO_TCPV4:
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gso_type = SKB_GSO_TCPV4;
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break;
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case VIRTIO_NET_HDR_GSO_TCPV6:
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gso_type = SKB_GSO_TCPV6;
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break;
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case VIRTIO_NET_HDR_GSO_UDP:
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gso_type = SKB_GSO_UDP;
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break;
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default:
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return -EINVAL;
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}
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if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)
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gso_type |= SKB_GSO_TCP_ECN;
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if (hdr->gso_size == 0)
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return -EINVAL;
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}
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if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
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u16 start = __virtio16_to_cpu(little_endian, hdr->csum_start);
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u16 off = __virtio16_to_cpu(little_endian, hdr->csum_offset);
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if (!skb_partial_csum_set(skb, start, off))
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return -EINVAL;
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}
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if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
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u16 gso_size = __virtio16_to_cpu(little_endian, hdr->gso_size);
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skb_shinfo(skb)->gso_size = gso_size;
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skb_shinfo(skb)->gso_type = gso_type;
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/* Header must be checked, and gso_segs computed. */
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skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
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skb_shinfo(skb)->gso_segs = 0;
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}
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return 0;
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}
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static inline int virtio_net_hdr_from_skb(const struct sk_buff *skb,
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struct virtio_net_hdr *hdr,
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bool little_endian,
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bool has_data_valid,
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int vlan_hlen)
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{
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memset(hdr, 0, sizeof(*hdr)); /* no info leak */
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if (skb_is_gso(skb)) {
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struct skb_shared_info *sinfo = skb_shinfo(skb);
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/* This is a hint as to how much should be linear. */
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hdr->hdr_len = __cpu_to_virtio16(little_endian,
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skb_headlen(skb));
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hdr->gso_size = __cpu_to_virtio16(little_endian,
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sinfo->gso_size);
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if (sinfo->gso_type & SKB_GSO_TCPV4)
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hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
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else if (sinfo->gso_type & SKB_GSO_TCPV6)
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hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
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else
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return -EINVAL;
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if (sinfo->gso_type & SKB_GSO_TCP_ECN)
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hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
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} else
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hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
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if (skb->ip_summed == CHECKSUM_PARTIAL) {
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hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
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hdr->csum_start = __cpu_to_virtio16(little_endian,
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skb_checksum_start_offset(skb) + vlan_hlen);
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hdr->csum_offset = __cpu_to_virtio16(little_endian,
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skb->csum_offset);
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} else if (has_data_valid &&
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skb->ip_summed == CHECKSUM_UNNECESSARY) {
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hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID;
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} /* else everything is zero */
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return 0;
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}
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#endif /* _LINUX_VIRTIO_NET_H */
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