Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 210 insertions, 0 deletions

diff --git a/include/linux/virtio_net.h b/include/linux/virtio_net.h
new file mode 100644
index 000000000..6047058d6
--- /dev/null
+++ b/include/linux/virtio_net.h
@@ -0,0 +1,210 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_VIRTIO_NET_H
+#define _LINUX_VIRTIO_NET_H
+
+#include <linux/if_vlan.h>
+#include <uapi/linux/tcp.h>
+#include <uapi/linux/udp.h>
+#include <uapi/linux/virtio_net.h>
+
+static inline bool virtio_net_hdr_match_proto(__be16 protocol, __u8 gso_type)
+{
+	switch (gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
+	case VIRTIO_NET_HDR_GSO_TCPV4:
+		return protocol == cpu_to_be16(ETH_P_IP);
+	case VIRTIO_NET_HDR_GSO_TCPV6:
+		return protocol == cpu_to_be16(ETH_P_IPV6);
+	case VIRTIO_NET_HDR_GSO_UDP:
+		return protocol == cpu_to_be16(ETH_P_IP) ||
+		       protocol == cpu_to_be16(ETH_P_IPV6);
+	default:
+		return false;
+	}
+}
+
+static inline int virtio_net_hdr_set_proto(struct sk_buff *skb,
+					   const struct virtio_net_hdr *hdr)
+{
+	if (skb->protocol)
+		return 0;
+
+	switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
+	case VIRTIO_NET_HDR_GSO_TCPV4:
+	case VIRTIO_NET_HDR_GSO_UDP:
+		skb->protocol = cpu_to_be16(ETH_P_IP);
+		break;
+	case VIRTIO_NET_HDR_GSO_TCPV6:
+		skb->protocol = cpu_to_be16(ETH_P_IPV6);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static inline int virtio_net_hdr_to_skb(struct sk_buff *skb,
+					const struct virtio_net_hdr *hdr,
+					bool little_endian)
+{
+	unsigned int gso_type = 0;
+	unsigned int thlen = 0;
+	unsigned int p_off = 0;
+	unsigned int ip_proto;
+
+	if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
+		switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
+		case VIRTIO_NET_HDR_GSO_TCPV4:
+			gso_type = SKB_GSO_TCPV4;
+			ip_proto = IPPROTO_TCP;
+			thlen = sizeof(struct tcphdr);
+			break;
+		case VIRTIO_NET_HDR_GSO_TCPV6:
+			gso_type = SKB_GSO_TCPV6;
+			ip_proto = IPPROTO_TCP;
+			thlen = sizeof(struct tcphdr);
+			break;
+		case VIRTIO_NET_HDR_GSO_UDP:
+			gso_type = SKB_GSO_UDP;
+			ip_proto = IPPROTO_UDP;
+			thlen = sizeof(struct udphdr);
+			break;
+		default:
+			return -EINVAL;
+		}
+
+		if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)
+			gso_type |= SKB_GSO_TCP_ECN;
+
+		if (hdr->gso_size == 0)
+			return -EINVAL;
+	}
+
+	skb_reset_mac_header(skb);
+
+	if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
+		u32 start = __virtio16_to_cpu(little_endian, hdr->csum_start);
+		u32 off = __virtio16_to_cpu(little_endian, hdr->csum_offset);
+		u32 needed = start + max_t(u32, thlen, off + sizeof(__sum16));
+
+		if (!pskb_may_pull(skb, needed))
+			return -EINVAL;
+
+		if (!skb_partial_csum_set(skb, start, off))
+			return -EINVAL;
+
+		p_off = skb_transport_offset(skb) + thlen;
+		if (!pskb_may_pull(skb, p_off))
+			return -EINVAL;
+	} else {
+		/* gso packets without NEEDS_CSUM do not set transport_offset.
+		 * probe and drop if does not match one of the above types.
+		 */
+		if (gso_type && skb->network_header) {
+			struct flow_keys_basic keys;
+
+			if (!skb->protocol) {
+				__be16 protocol = dev_parse_header_protocol(skb);
+
+				if (!protocol)
+					virtio_net_hdr_set_proto(skb, hdr);
+				else if (!virtio_net_hdr_match_proto(protocol, hdr->gso_type))
+					return -EINVAL;
+				else
+					skb->protocol = protocol;
+			}
+retry:
+			if (!skb_flow_dissect_flow_keys_basic(NULL, skb, &keys,
+							      NULL, 0, 0, 0,
+							      0)) {
+				/* UFO does not specify ipv4 or 6: try both */
+				if (gso_type & SKB_GSO_UDP &&
+				    skb->protocol == htons(ETH_P_IP)) {
+					skb->protocol = htons(ETH_P_IPV6);
+					goto retry;
+				}
+				return -EINVAL;
+			}
+
+			p_off = keys.control.thoff + thlen;
+			if (!pskb_may_pull(skb, p_off) ||
+			    keys.basic.ip_proto != ip_proto)
+				return -EINVAL;
+
+			skb_set_transport_header(skb, keys.control.thoff);
+		} else if (gso_type) {
+			p_off = thlen;
+			if (!pskb_may_pull(skb, p_off))
+				return -EINVAL;
+		}
+	}
+
+	if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
+		u16 gso_size = __virtio16_to_cpu(little_endian, hdr->gso_size);
+		unsigned int nh_off = p_off;
+		struct skb_shared_info *shinfo = skb_shinfo(skb);
+
+		/* UFO may not include transport header in gso_size. */
+		if (gso_type & SKB_GSO_UDP)
+			nh_off -= thlen;
+
+		/* Kernel has a special handling for GSO_BY_FRAGS. */
+		if (gso_size == GSO_BY_FRAGS)
+			return -EINVAL;
+
+		/* Too small packets are not really GSO ones. */
+		if (skb->len - nh_off > gso_size) {
+			shinfo->gso_size = gso_size;
+			shinfo->gso_type = gso_type;
+
+			/* Header must be checked, and gso_segs computed. */
+			shinfo->gso_type |= SKB_GSO_DODGY;
+			shinfo->gso_segs = 0;
+		}
+	}
+
+	return 0;
+}
+
+static inline int virtio_net_hdr_from_skb(const struct sk_buff *skb,
+					  struct virtio_net_hdr *hdr,
+					  bool little_endian,
+					  bool has_data_valid,
+					  int vlan_hlen)
+{
+	memset(hdr, 0, sizeof(*hdr));   /* no info leak */
+
+	if (skb_is_gso(skb)) {
+		struct skb_shared_info *sinfo = skb_shinfo(skb);
+
+		/* This is a hint as to how much should be linear. */
+		hdr->hdr_len = __cpu_to_virtio16(little_endian,
+						 skb_headlen(skb));
+		hdr->gso_size = __cpu_to_virtio16(little_endian,
+						  sinfo->gso_size);
+		if (sinfo->gso_type & SKB_GSO_TCPV4)
+			hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
+		else if (sinfo->gso_type & SKB_GSO_TCPV6)
+			hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
+		else
+			return -EINVAL;
+		if (sinfo->gso_type & SKB_GSO_TCP_ECN)
+			hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
+	} else
+		hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
+
+	if (skb->ip_summed == CHECKSUM_PARTIAL) {
+		hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
+		hdr->csum_start = __cpu_to_virtio16(little_endian,
+			skb_checksum_start_offset(skb) + vlan_hlen);
+		hdr->csum_offset = __cpu_to_virtio16(little_endian,
+				skb->csum_offset);
+	} else if (has_data_valid &&
+		   skb->ip_summed == CHECKSUM_UNNECESSARY) {
+		hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID;
+	} /* else everything is zero */
+
+	return 0;
+}
+
+#endif /* _LINUX_VIRTIO_NET_H */