drivers/net/tun.c

1751 	struct virtio_net_hdr gso = { 0 };
1777 		if (!copy_from_iter_full(&gso, sizeof(gso), from))
1780 		if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
1781 		    tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2 > tun16_to_cpu(tun, gso.hdr_len))
1782 			gso.hdr_len = cpu_to_tun16(tun, tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2);
1784 		if (tun16_to_cpu(tun, gso.hdr_len) > len)
1786 		iov_iter_advance(from, vnet_hdr_sz - sizeof(gso));
1792 			     (gso.hdr_len && tun16_to_cpu(tun, gso.hdr_len) < ETH_HLEN)))
1805 		copylen = gso.hdr_len ? tun16_to_cpu(tun, gso.hdr_len) : GOODCOPY_LEN;
1816 		 * (e.g gso or jumbo packet), we will do it at after
1819 		skb = tun_build_skb(tun, tfile, from, &gso, len, &skb_xdp);
1828 			if (tun16_to_cpu(tun, gso.hdr_len) > good_linear)
1831 				linear = tun16_to_cpu(tun, gso.hdr_len);
1866 	if (virtio_net_hdr_to_skb(skb, &gso, tun_is_little_endian(tun))) {
2064 		struct virtio_net_hdr gso = { 0 };
2069 		if (unlikely(copy_to_iter(&gso, sizeof(gso), iter) !=
2070 			     sizeof(gso)))
2072 		iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso));
2119 		struct virtio_net_hdr gso;
2124 		if (virtio_net_hdr_from_skb(skb, &gso,
2131 					   sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size),
2132 					   tun16_to_cpu(tun, gso.hdr_len));
2136 					       min((int)tun16_to_cpu(tun, gso.hdr_len), 64), true);
2142 		if (copy_to_iter(&gso, sizeof(gso), iter) != sizeof(gso))
2145 		iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso));
2444 	struct virtio_net_hdr *gso = &hdr->gso;
2456 		if (gso->gso_type) {
2502 	if (virtio_net_hdr_to_skb(skb, gso, tun_is_little_endian(tun))) {