projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| fd2a0437 MR |
2 | #ifndef _LINUX_VIRTIO_NET_H |
| 3 | #define _LINUX_VIRTIO_NET_H | |
| 4 | ||
| 5 | #include <linux/if_vlan.h> | |
| 6 | #include <uapi/linux/virtio_net.h> | |
| 7 | ||
| 8 | static inline int virtio_net_hdr_to_skb(struct sk_buff *skb, | |
| 9 | const struct virtio_net_hdr *hdr, | |
| 10 | bool little_endian) | |
| 11 | { | |
| 12 | unsigned short gso_type = 0; | |
| 13 | ||
| 14 | if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
| 15 | switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
| 16 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
| 17 | gso_type = SKB_GSO_TCPV4; | |
| 18 | break; | |
| 19 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
| 20 | gso_type = SKB_GSO_TCPV6; | |
| 21 | break; | |
| fd2a0437 MR |
22 | default: |
| 23 | return -EINVAL; | |
| 24 | } | |
| 25 | ||
| 26 | if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
| 27 | gso_type |= SKB_GSO_TCP_ECN; | |
| 28 | ||
| 29 | if (hdr->gso_size == 0) | |
| 30 | return -EINVAL; | |
| 31 | } | |
| 32 | ||
| 33 | if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
| 34 | u16 start = __virtio16_to_cpu(little_endian, hdr->csum_start); | |
| 35 | u16 off = __virtio16_to_cpu(little_endian, hdr->csum_offset); | |
| 36 | ||
| 37 | if (!skb_partial_csum_set(skb, start, off)) | |
| 38 | return -EINVAL; | |
| 39 | } | |
| 40 | ||
| 41 | if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
| 42 | u16 gso_size = __virtio16_to_cpu(little_endian, hdr->gso_size); | |
| 43 | ||
| 44 | skb_shinfo(skb)->gso_size = gso_size; | |
| 45 | skb_shinfo(skb)->gso_type = gso_type; | |
| 46 | ||
| 47 | /* Header must be checked, and gso_segs computed. */ | |
| 48 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
| 49 | skb_shinfo(skb)->gso_segs = 0; | |
| 50 | } | |
| 51 | ||
| 52 | return 0; | |
| 53 | } | |
| 54 | ||
| 55 | static inline int virtio_net_hdr_from_skb(const struct sk_buff *skb, | |
| 56 | struct virtio_net_hdr *hdr, | |
| 6391a448 JW |
57 | bool little_endian, |
| 58 | bool has_data_valid) | |
| fd2a0437 | 59 | { |
| 9403cd7c | 60 | memset(hdr, 0, sizeof(*hdr)); /* no info leak */ |
| fd2a0437 MR |
61 | |
| 62 | if (skb_is_gso(skb)) { | |
| 63 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
| 64 | ||
| 65 | /* This is a hint as to how much should be linear. */ | |
| 66 | hdr->hdr_len = __cpu_to_virtio16(little_endian, | |
| 67 | skb_headlen(skb)); | |
| 68 | hdr->gso_size = __cpu_to_virtio16(little_endian, | |
| 69 | sinfo->gso_size); | |
| 70 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
| 71 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
| 72 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
| 73 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
| fd2a0437 MR |
74 | else |
| 75 | return -EINVAL; | |
| 76 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
| 77 | hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
| 78 | } else | |
| 79 | hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
| 80 | ||
| 81 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
| 82 | hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
| 83 | if (skb_vlan_tag_present(skb)) | |
| 84 | hdr->csum_start = __cpu_to_virtio16(little_endian, | |
| 85 | skb_checksum_start_offset(skb) + VLAN_HLEN); | |
| 86 | else | |
| 87 | hdr->csum_start = __cpu_to_virtio16(little_endian, | |
| 88 | skb_checksum_start_offset(skb)); | |
| 89 | hdr->csum_offset = __cpu_to_virtio16(little_endian, | |
| 90 | skb->csum_offset); | |
| 6391a448 JW |
91 | } else if (has_data_valid && |
| 92 | skb->ip_summed == CHECKSUM_UNNECESSARY) { | |
| 93 | hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
| fd2a0437 MR |
94 | } /* else everything is zero */ |
| 95 | ||
| 96 | return 0; | |
| 97 | } | |
| 98 | ||
| d66016a7 | 99 | #endif /* _LINUX_VIRTIO_NET_H */ |