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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> | |
9274124f WB |
6 | #include <uapi/linux/tcp.h> |
7 | #include <uapi/linux/udp.h> | |
fd2a0437 MR |
8 | #include <uapi/linux/virtio_net.h> |
9 | ||
9d2f67e4 JT |
10 | static inline int virtio_net_hdr_set_proto(struct sk_buff *skb, |
11 | const struct virtio_net_hdr *hdr) | |
12 | { | |
13 | switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
14 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
15 | case VIRTIO_NET_HDR_GSO_UDP: | |
16 | skb->protocol = cpu_to_be16(ETH_P_IP); | |
17 | break; | |
18 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
19 | skb->protocol = cpu_to_be16(ETH_P_IPV6); | |
20 | break; | |
21 | default: | |
22 | return -EINVAL; | |
23 | } | |
24 | ||
25 | return 0; | |
26 | } | |
27 | ||
fd2a0437 MR |
28 | static inline int virtio_net_hdr_to_skb(struct sk_buff *skb, |
29 | const struct virtio_net_hdr *hdr, | |
30 | bool little_endian) | |
31 | { | |
0c19f846 | 32 | unsigned int gso_type = 0; |
9274124f | 33 | unsigned int thlen = 0; |
6dd912f8 | 34 | unsigned int p_off = 0; |
9274124f | 35 | unsigned int ip_proto; |
fd2a0437 MR |
36 | |
37 | if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
38 | switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
39 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
40 | gso_type = SKB_GSO_TCPV4; | |
9274124f WB |
41 | ip_proto = IPPROTO_TCP; |
42 | thlen = sizeof(struct tcphdr); | |
fd2a0437 MR |
43 | break; |
44 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
45 | gso_type = SKB_GSO_TCPV6; | |
9274124f WB |
46 | ip_proto = IPPROTO_TCP; |
47 | thlen = sizeof(struct tcphdr); | |
fd2a0437 | 48 | break; |
0c19f846 WB |
49 | case VIRTIO_NET_HDR_GSO_UDP: |
50 | gso_type = SKB_GSO_UDP; | |
9274124f WB |
51 | ip_proto = IPPROTO_UDP; |
52 | thlen = sizeof(struct udphdr); | |
0c19f846 | 53 | break; |
fd2a0437 MR |
54 | default: |
55 | return -EINVAL; | |
56 | } | |
57 | ||
58 | if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
59 | gso_type |= SKB_GSO_TCP_ECN; | |
60 | ||
61 | if (hdr->gso_size == 0) | |
62 | return -EINVAL; | |
63 | } | |
64 | ||
65 | if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
66 | u16 start = __virtio16_to_cpu(little_endian, hdr->csum_start); | |
67 | u16 off = __virtio16_to_cpu(little_endian, hdr->csum_offset); | |
68 | ||
69 | if (!skb_partial_csum_set(skb, start, off)) | |
70 | return -EINVAL; | |
9274124f | 71 | |
6dd912f8 WB |
72 | p_off = skb_transport_offset(skb) + thlen; |
73 | if (p_off > skb_headlen(skb)) | |
9274124f | 74 | return -EINVAL; |
d5be7f63 WB |
75 | } else { |
76 | /* gso packets without NEEDS_CSUM do not set transport_offset. | |
77 | * probe and drop if does not match one of the above types. | |
78 | */ | |
9e8db591 | 79 | if (gso_type && skb->network_header) { |
9274124f WB |
80 | struct flow_keys_basic keys; |
81 | ||
9e8db591 WB |
82 | if (!skb->protocol) |
83 | virtio_net_hdr_set_proto(skb, hdr); | |
84 | retry: | |
9274124f WB |
85 | if (!skb_flow_dissect_flow_keys_basic(NULL, skb, &keys, |
86 | NULL, 0, 0, 0, | |
87 | 0)) { | |
9e8db591 WB |
88 | /* UFO does not specify ipv4 or 6: try both */ |
89 | if (gso_type & SKB_GSO_UDP && | |
90 | skb->protocol == htons(ETH_P_IP)) { | |
91 | skb->protocol = htons(ETH_P_IPV6); | |
92 | goto retry; | |
93 | } | |
d5be7f63 | 94 | return -EINVAL; |
9e8db591 | 95 | } |
9274124f | 96 | |
6dd912f8 WB |
97 | p_off = keys.control.thoff + thlen; |
98 | if (p_off > skb_headlen(skb) || | |
9274124f WB |
99 | keys.basic.ip_proto != ip_proto) |
100 | return -EINVAL; | |
101 | ||
102 | skb_set_transport_header(skb, keys.control.thoff); | |
6dd912f8 WB |
103 | } else if (gso_type) { |
104 | p_off = thlen; | |
105 | if (p_off > skb_headlen(skb)) | |
106 | return -EINVAL; | |
d5be7f63 | 107 | } |
fd2a0437 MR |
108 | } |
109 | ||
110 | if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
111 | u16 gso_size = __virtio16_to_cpu(little_endian, hdr->gso_size); | |
7c6d2ecb | 112 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
fd2a0437 | 113 | |
7c6d2ecb ED |
114 | /* Too small packets are not really GSO ones. */ |
115 | if (skb->len - p_off > gso_size) { | |
116 | shinfo->gso_size = gso_size; | |
117 | shinfo->gso_type = gso_type; | |
fd2a0437 | 118 | |
7c6d2ecb ED |
119 | /* Header must be checked, and gso_segs computed. */ |
120 | shinfo->gso_type |= SKB_GSO_DODGY; | |
121 | shinfo->gso_segs = 0; | |
122 | } | |
fd2a0437 MR |
123 | } |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
128 | static inline int virtio_net_hdr_from_skb(const struct sk_buff *skb, | |
129 | struct virtio_net_hdr *hdr, | |
6391a448 | 130 | bool little_endian, |
fd3a8862 WB |
131 | bool has_data_valid, |
132 | int vlan_hlen) | |
fd2a0437 | 133 | { |
9403cd7c | 134 | memset(hdr, 0, sizeof(*hdr)); /* no info leak */ |
fd2a0437 MR |
135 | |
136 | if (skb_is_gso(skb)) { | |
137 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
138 | ||
139 | /* This is a hint as to how much should be linear. */ | |
140 | hdr->hdr_len = __cpu_to_virtio16(little_endian, | |
141 | skb_headlen(skb)); | |
142 | hdr->gso_size = __cpu_to_virtio16(little_endian, | |
143 | sinfo->gso_size); | |
144 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
145 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
146 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
147 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
fd2a0437 MR |
148 | else |
149 | return -EINVAL; | |
150 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
151 | hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
152 | } else | |
153 | hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
154 | ||
155 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
156 | hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
fd3a8862 WB |
157 | hdr->csum_start = __cpu_to_virtio16(little_endian, |
158 | skb_checksum_start_offset(skb) + vlan_hlen); | |
fd2a0437 MR |
159 | hdr->csum_offset = __cpu_to_virtio16(little_endian, |
160 | skb->csum_offset); | |
6391a448 JW |
161 | } else if (has_data_valid && |
162 | skb->ip_summed == CHECKSUM_UNNECESSARY) { | |
163 | hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
fd2a0437 MR |
164 | } /* else everything is zero */ |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
d66016a7 | 169 | #endif /* _LINUX_VIRTIO_NET_H */ |