1092 	struct virtio_net_hdr gso = { 0 };  in tun_get_user()  local
1115 		n = copy_from_iter(&gso, sizeof(gso), from);  in tun_get_user()
1116 		if (n != sizeof(gso))  in tun_get_user()
1119 		if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&  in tun_get_user()
1120 …tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2 > tun16_to_cpu(tun, gso…  in tun_get_user()
1121 …gso.hdr_len = cpu_to_tun16(tun, tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_off…  in tun_get_user()
1123 		if (tun16_to_cpu(tun, gso.hdr_len) > len)  in tun_get_user()
1125 		iov_iter_advance(from, tun->vnet_hdr_sz - sizeof(gso));  in tun_get_user()
1131 			     (gso.hdr_len && tun16_to_cpu(tun, gso.hdr_len) < ETH_HLEN)))  in tun_get_user()
1144 		copylen = gso.hdr_len ? tun16_to_cpu(tun, gso.hdr_len) : GOODCOPY_LEN;  in tun_get_user()
1155 		if (tun16_to_cpu(tun, gso.hdr_len) > good_linear)  in tun_get_user()
1158 			linear = tun16_to_cpu(tun, gso.hdr_len);  in tun_get_user()
1184 	if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {  in tun_get_user()
1185 		if (!skb_partial_csum_set(skb, tun16_to_cpu(tun, gso.csum_start),  in tun_get_user()
1186 					  tun16_to_cpu(tun, gso.csum_offset))) {  in tun_get_user()
1219 	if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) {  in tun_get_user()
1221 		switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {  in tun_get_user()
1237 		if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN)  in tun_get_user()
1240 		skb_shinfo(skb)->gso_size = tun16_to_cpu(tun, gso.gso_size);  in tun_get_user()
1323 		struct virtio_net_hdr gso = { 0 }; /* no info leak */  in tun_put_user()  local
1331 			gso.hdr_len = cpu_to_tun16(tun, skb_headlen(skb));  in tun_put_user()
1332 			gso.gso_size = cpu_to_tun16(tun, sinfo->gso_size);  in tun_put_user()
1334 				gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;  in tun_put_user()
1336 				gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;  in tun_put_user()
1338 				gso.gso_type = VIRTIO_NET_HDR_GSO_UDP;  in tun_put_user()
1342 				       sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size),  in tun_put_user()
1343 				       tun16_to_cpu(tun, gso.hdr_len));  in tun_put_user()
1347 					       min((int)tun16_to_cpu(tun, gso.hdr_len), 64), true);  in tun_put_user()
1352 				gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN;  in tun_put_user()
1354 			gso.gso_type = VIRTIO_NET_HDR_GSO_NONE;  in tun_put_user()
1357 			gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;  in tun_put_user()
1358 			gso.csum_start = cpu_to_tun16(tun, skb_checksum_start_offset(skb) +  in tun_put_user()
1360 			gso.csum_offset = cpu_to_tun16(tun, skb->csum_offset);  in tun_put_user()
1362 			gso.flags = VIRTIO_NET_HDR_F_DATA_VALID;  in tun_put_user()
1365 		if (copy_to_iter(&gso, sizeof(gso), iter) != sizeof(gso))  in tun_put_user()
1368 		iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso));  in tun_put_user()