1 /* 2 * Universal TUN/TAP device driver. 3 * Copyright (C) 1999-2000 Maxim Krasnyansky <[email protected]> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 */ 15 16 #ifndef __IF_TUN_H 17 #define __IF_TUN_H 18 19 #include <linux/types.h> 20 #include <linux/if_ether.h> 21 22 /* Read queue size */ 23 #define TUN_READQ_SIZE 500 24 25 /* TUN device flags */ 26 #define TUN_TUN_DEV 0x0001 27 #define TUN_TAP_DEV 0x0002 28 #define TUN_TYPE_MASK 0x000f 29 30 #define TUN_FASYNC 0x0010 31 #define TUN_NOCHECKSUM 0x0020 32 #define TUN_NO_PI 0x0040 33 #define TUN_ONE_QUEUE 0x0080 34 #define TUN_PERSIST 0x0100 35 #define TUN_VNET_HDR 0x0200 36 37 /* Ioctl defines */ 38 #define TUNSETNOCSUM _IOW('T', 200, int) 39 #define TUNSETDEBUG _IOW('T', 201, int) 40 #define TUNSETIFF _IOW('T', 202, int) 41 #define TUNSETPERSIST _IOW('T', 203, int) 42 #define TUNSETOWNER _IOW('T', 204, int) 43 #define TUNSETLINK _IOW('T', 205, int) 44 #define TUNSETGROUP _IOW('T', 206, int) 45 #define TUNGETFEATURES _IOR('T', 207, unsigned int) 46 #define TUNSETOFFLOAD _IOW('T', 208, unsigned int) 47 #define TUNSETTXFILTER _IOW('T', 209, unsigned int) 48 49 /* TUNSETIFF ifr flags */ 50 #define IFF_TUN 0x0001 51 #define IFF_TAP 0x0002 52 #define IFF_NO_PI 0x1000 53 #define IFF_ONE_QUEUE 0x2000 54 #define IFF_VNET_HDR 0x4000 55 56 /* Features for GSO (TUNSETOFFLOAD). */ 57 #define TUN_F_CSUM 0x01 /* You can hand me unchecksummed packets. */ 58 #define TUN_F_TSO4 0x02 /* I can handle TSO for IPv4 packets */ 59 #define TUN_F_TSO6 0x04 /* I can handle TSO for IPv6 packets */ 60 #define TUN_F_TSO_ECN 0x08 /* I can handle TSO with ECN bits. */ 61 62 /* Protocol info prepended to the packets (when IFF_NO_PI is not set) */ 63 #define TUN_PKT_STRIP 0x0001 64 struct tun_pi { 65 __u16 flags; 66 __be16 proto; 67 }; 68 69 /* 70 * Filter spec (used for SETXXFILTER ioctls) 71 * This stuff is applicable only to the TAP (Ethernet) devices. 72 * If the count is zero the filter is disabled and the driver accepts 73 * all packets (promisc mode). 74 * If the filter is enabled in order to accept broadcast packets 75 * broadcast addr must be explicitly included in the addr list. 76 */ 77 #define TUN_FLT_ALLMULTI 0x0001 /* Accept all multicast packets */ 78 struct tun_filter { 79 __u16 flags; /* TUN_FLT_ flags see above */ 80 __u16 count; /* Number of addresses */ 81 __u8 addr[0][ETH_ALEN]; 82 }; 83 84 #endif /* __IF_TUN_H */ 85