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seccomp: Move speculation migitation control to arch code
[mirror_ubuntu-artful-kernel.git] / include / linux / virtio_net.h
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1#ifndef _LINUX_VIRTIO_NET_H
2#define _LINUX_VIRTIO_NET_H
3
4#include <linux/if_vlan.h>
5#include <uapi/linux/virtio_net.h>
6
7static inline int virtio_net_hdr_to_skb(struct sk_buff *skb,
8 const struct virtio_net_hdr *hdr,
9 bool little_endian)
10{
11 unsigned short gso_type = 0;
12
13 if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
14 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
15 case VIRTIO_NET_HDR_GSO_TCPV4:
16 gso_type = SKB_GSO_TCPV4;
17 break;
18 case VIRTIO_NET_HDR_GSO_TCPV6:
19 gso_type = SKB_GSO_TCPV6;
20 break;
21 case VIRTIO_NET_HDR_GSO_UDP:
22 gso_type = SKB_GSO_UDP;
23 break;
24 default:
25 return -EINVAL;
26 }
27
28 if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)
29 gso_type |= SKB_GSO_TCP_ECN;
30
31 if (hdr->gso_size == 0)
32 return -EINVAL;
33 }
34
35 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
36 u16 start = __virtio16_to_cpu(little_endian, hdr->csum_start);
37 u16 off = __virtio16_to_cpu(little_endian, hdr->csum_offset);
38
39 if (!skb_partial_csum_set(skb, start, off))
40 return -EINVAL;
41 }
42
43 if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
44 u16 gso_size = __virtio16_to_cpu(little_endian, hdr->gso_size);
45
46 skb_shinfo(skb)->gso_size = gso_size;
47 skb_shinfo(skb)->gso_type = gso_type;
48
49 /* Header must be checked, and gso_segs computed. */
50 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
51 skb_shinfo(skb)->gso_segs = 0;
52 }
53
54 return 0;
55}
56
57static inline int virtio_net_hdr_from_skb(const struct sk_buff *skb,
58 struct virtio_net_hdr *hdr,
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59 bool little_endian,
60 bool has_data_valid)
fd2a0437 61{
9403cd7c 62 memset(hdr, 0, sizeof(*hdr)); /* no info leak */
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63
64 if (skb_is_gso(skb)) {
65 struct skb_shared_info *sinfo = skb_shinfo(skb);
66
67 /* This is a hint as to how much should be linear. */
68 hdr->hdr_len = __cpu_to_virtio16(little_endian,
69 skb_headlen(skb));
70 hdr->gso_size = __cpu_to_virtio16(little_endian,
71 sinfo->gso_size);
72 if (sinfo->gso_type & SKB_GSO_TCPV4)
73 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
74 else if (sinfo->gso_type & SKB_GSO_TCPV6)
75 hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
76 else if (sinfo->gso_type & SKB_GSO_UDP)
77 hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
78 else
79 return -EINVAL;
80 if (sinfo->gso_type & SKB_GSO_TCP_ECN)
81 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
82 } else
83 hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
84
85 if (skb->ip_summed == CHECKSUM_PARTIAL) {
86 hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
87 if (skb_vlan_tag_present(skb))
88 hdr->csum_start = __cpu_to_virtio16(little_endian,
89 skb_checksum_start_offset(skb) + VLAN_HLEN);
90 else
91 hdr->csum_start = __cpu_to_virtio16(little_endian,
92 skb_checksum_start_offset(skb));
93 hdr->csum_offset = __cpu_to_virtio16(little_endian,
94 skb->csum_offset);
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95 } else if (has_data_valid &&
96 skb->ip_summed == CHECKSUM_UNNECESSARY) {
97 hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID;
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98 } /* else everything is zero */
99
100 return 0;
101}
102
d66016a7 103#endif /* _LINUX_VIRTIO_NET_H */