1 /* Copyright (C) 2021 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz> 2 3 This program is free software: you can redistribute it and/or modify 4 it under the terms of the GNU General Public License as published by 5 the Free Software Foundation, either version 3 of the License, or 6 (at your option) any later version. 7 8 This program is distributed in the hope that it will be useful, 9 but WITHOUT ANY WARRANTY; without even the implied warranty of 10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 GNU General Public License for more details. 12 13 You should have received a copy of the GNU General Public License 14 along with this program. If not, see <https://www.gnu.org/licenses/>. 15 */ 16 17 /*! 18 * \file 19 * 20 * \brief XDP message description. 21 * 22 * \addtogroup xdp 23 * @{ 24 */ 25 26 #pragma once 27 28 #include <stdint.h> 29 #include <linux/if_ether.h> 30 #include <linux/ipv6.h> 31 #include <sys/uio.h> 32 33 /*! \brief Message flags. */ 34 typedef enum { 35 KNOT_XDP_MSG_IPV6 = (1 << 0), /*!< This packet is a IPv6 (IPv4 otherwise). */ 36 KNOT_XDP_MSG_TCP = (1 << 1), /*!< This packet is a TCP (UDP otherwise). */ 37 KNOT_XDP_MSG_SYN = (1 << 2), /*!< SYN flag set (TCP only). */ 38 KNOT_XDP_MSG_ACK = (1 << 3), /*!< ACK flag set (TCP only). */ 39 KNOT_XDP_MSG_FIN = (1 << 4), /*!< FIN flag set (TCP only). */ 40 KNOT_XDP_MSG_RST = (1 << 5), /*!< RST flag set (TCP only). */ 41 KNOT_XDP_MSG_MSS = (1 << 6), /*!< MSS option in TCP header (TCP only). */ 42 } knot_xdp_msg_flag_t; 43 44 /*! \brief Packet description with src & dst MAC & IP addrs + DNS payload. */ 45 typedef struct knot_xdp_msg { 46 struct sockaddr_in6 ip_from; 47 struct sockaddr_in6 ip_to; 48 uint8_t eth_from[ETH_ALEN]; 49 uint8_t eth_to[ETH_ALEN]; 50 knot_xdp_msg_flag_t flags; 51 struct iovec payload; 52 uint32_t seqno; 53 uint32_t ackno; 54 uint16_t mss; 55 } knot_xdp_msg_t; 56 57 /*! @} */ 58