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180 lines
4.7 KiB
180 lines
4.7 KiB
/* 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/tcp.h> |
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#include <uapi/linux/udp.h> |
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#include <uapi/linux/virtio_net.h> |
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static inline int virtio_net_hdr_set_proto(struct sk_buff *skb, |
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const struct virtio_net_hdr *hdr) |
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{ |
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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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case VIRTIO_NET_HDR_GSO_UDP: |
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skb->protocol = cpu_to_be16(ETH_P_IP); |
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break; |
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case VIRTIO_NET_HDR_GSO_TCPV6: |
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skb->protocol = cpu_to_be16(ETH_P_IPV6); |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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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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unsigned int thlen = 0; |
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unsigned int p_off = 0; |
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unsigned int ip_proto; |
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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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ip_proto = IPPROTO_TCP; |
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thlen = sizeof(struct tcphdr); |
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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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ip_proto = IPPROTO_TCP; |
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thlen = sizeof(struct tcphdr); |
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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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ip_proto = IPPROTO_UDP; |
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thlen = sizeof(struct udphdr); |
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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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skb_reset_mac_header(skb); |
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if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
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u32 start = __virtio16_to_cpu(little_endian, hdr->csum_start); |
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u32 off = __virtio16_to_cpu(little_endian, hdr->csum_offset); |
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u32 needed = start + max_t(u32, thlen, off + sizeof(__sum16)); |
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if (!pskb_may_pull(skb, needed)) |
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return -EINVAL; |
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if (!skb_partial_csum_set(skb, start, off)) |
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return -EINVAL; |
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p_off = skb_transport_offset(skb) + thlen; |
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if (!pskb_may_pull(skb, p_off)) |
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return -EINVAL; |
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} else { |
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/* gso packets without NEEDS_CSUM do not set transport_offset. |
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* probe and drop if does not match one of the above types. |
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*/ |
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if (gso_type && skb->network_header) { |
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struct flow_keys_basic keys; |
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if (!skb->protocol) { |
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__be16 protocol = dev_parse_header_protocol(skb); |
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virtio_net_hdr_set_proto(skb, hdr); |
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if (protocol && protocol != skb->protocol) |
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return -EINVAL; |
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} |
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retry: |
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if (!skb_flow_dissect_flow_keys_basic(NULL, skb, &keys, |
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NULL, 0, 0, 0, |
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0)) { |
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/* UFO does not specify ipv4 or 6: try both */ |
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if (gso_type & SKB_GSO_UDP && |
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skb->protocol == htons(ETH_P_IP)) { |
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skb->protocol = htons(ETH_P_IPV6); |
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goto retry; |
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} |
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return -EINVAL; |
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} |
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p_off = keys.control.thoff + thlen; |
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if (!pskb_may_pull(skb, p_off) || |
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keys.basic.ip_proto != ip_proto) |
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return -EINVAL; |
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skb_set_transport_header(skb, keys.control.thoff); |
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} else if (gso_type) { |
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p_off = thlen; |
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if (!pskb_may_pull(skb, p_off)) |
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return -EINVAL; |
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} |
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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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struct skb_shared_info *shinfo = skb_shinfo(skb); |
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/* Too small packets are not really GSO ones. */ |
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if (skb->len - p_off > gso_size) { |
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shinfo->gso_size = gso_size; |
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shinfo->gso_type = gso_type; |
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/* Header must be checked, and gso_segs computed. */ |
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shinfo->gso_type |= SKB_GSO_DODGY; |
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shinfo->gso_segs = 0; |
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} |
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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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