net: more strict VIRTIO_NET_HDR_GSO_UDP_L4 validation

Syzbot reported two new paths to hit an internal WARNING using the
new virtio gso type VIRTIO_NET_HDR_GSO_UDP_L4.

RIP: 0010:skb_checksum_help+0x4a2/0x600 net/core/dev.c:3260
skb len=64521 gso_size=344
and

RIP: 0010:skb_warn_bad_offload+0x118/0x240 net/core/dev.c:3262

Older virtio types have historically had loose restrictions, leading
to many entirely impractical fuzzer generated packets causing
problems deep in the kernel stack. Ideally, we would have had strict
validation for all types from the start.

New virtio types can have tighter validation. Limit UDP GSO packets
inserted via virtio to the same limits imposed by the UDP_SEGMENT
socket interface:

1. must use checksum offload
2. checksum offload matches UDP header
3. no more segments than UDP_MAX_SEGMENTS
4. UDP GSO does not take modifier flags, notably SKB_GSO_TCP_ECN

Fixes: 860b7f27b8f7 ("linux/virtio_net.h: Support USO offload in vnet header.")
Reported-by: [e-mail]
Closes: https://lore.kernel.org/netdev/[e-mail]/
Reported-by: [e-mail]
Closes: https://lore.kernel.org/netdev/[e-mail]/
Signed-off-by: Willem de Bruijn <[e-mail]>
Reviewed-by: Eric Dumazet <[e-mail]>
Acked-by: Jason Wang <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/linux/virtio_net.h

···
 #define _LINUX_VIRTIO_NET_H
 
 #include <linux/if_vlan.h>
+#include <linux/udp.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)
···
 		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)
+		switch (gso_type & ~SKB_GSO_TCP_ECN) {
+		case SKB_GSO_UDP:
+			/* UFO may not include transport header in gso_size. */
 			nh_off -= thlen;
+			break;
+		case SKB_GSO_UDP_L4:
+			if (!(hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM))
+				return -EINVAL;
+			if (skb->csum_offset != offsetof(struct udphdr, check))
+				return -EINVAL;
+			if (skb->len - p_off > gso_size * UDP_MAX_SEGMENTS)
+				return -EINVAL;
+			if (gso_type != SKB_GSO_UDP_L4)
+				return -EINVAL;
+			break;
+		}
 
 		/* Kernel has a special handling for GSO_BY_FRAGS. */
 		if (gso_size == GSO_BY_FRAGS)