409 строки
8.3 KiB
C
409 строки
8.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2021 Taehee Yoo <ap420073@gmail.com>
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*/
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#ifndef _NET_AMT_H_
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#define _NET_AMT_H_
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#include <linux/siphash.h>
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#include <linux/jhash.h>
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#include <linux/netdevice.h>
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#include <net/gro_cells.h>
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#include <net/rtnetlink.h>
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enum amt_msg_type {
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AMT_MSG_DISCOVERY = 1,
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AMT_MSG_ADVERTISEMENT,
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AMT_MSG_REQUEST,
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AMT_MSG_MEMBERSHIP_QUERY,
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AMT_MSG_MEMBERSHIP_UPDATE,
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AMT_MSG_MULTICAST_DATA,
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AMT_MSG_TEARDOWN,
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__AMT_MSG_MAX,
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};
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#define AMT_MSG_MAX (__AMT_MSG_MAX - 1)
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enum amt_ops {
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/* A*B */
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AMT_OPS_INT,
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/* A+B */
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AMT_OPS_UNI,
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/* A-B */
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AMT_OPS_SUB,
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/* B-A */
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AMT_OPS_SUB_REV,
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__AMT_OPS_MAX,
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};
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#define AMT_OPS_MAX (__AMT_OPS_MAX - 1)
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enum amt_filter {
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AMT_FILTER_FWD,
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AMT_FILTER_D_FWD,
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AMT_FILTER_FWD_NEW,
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AMT_FILTER_D_FWD_NEW,
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AMT_FILTER_ALL,
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AMT_FILTER_NONE_NEW,
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AMT_FILTER_BOTH,
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AMT_FILTER_BOTH_NEW,
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__AMT_FILTER_MAX,
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};
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#define AMT_FILTER_MAX (__AMT_FILTER_MAX - 1)
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enum amt_act {
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AMT_ACT_GMI,
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AMT_ACT_GMI_ZERO,
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AMT_ACT_GT,
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AMT_ACT_STATUS_FWD_NEW,
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AMT_ACT_STATUS_D_FWD_NEW,
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AMT_ACT_STATUS_NONE_NEW,
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__AMT_ACT_MAX,
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};
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#define AMT_ACT_MAX (__AMT_ACT_MAX - 1)
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enum amt_status {
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AMT_STATUS_INIT,
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AMT_STATUS_SENT_DISCOVERY,
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AMT_STATUS_RECEIVED_DISCOVERY,
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AMT_STATUS_SENT_ADVERTISEMENT,
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AMT_STATUS_RECEIVED_ADVERTISEMENT,
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AMT_STATUS_SENT_REQUEST,
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AMT_STATUS_RECEIVED_REQUEST,
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AMT_STATUS_SENT_QUERY,
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AMT_STATUS_RECEIVED_QUERY,
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AMT_STATUS_SENT_UPDATE,
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AMT_STATUS_RECEIVED_UPDATE,
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__AMT_STATUS_MAX,
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};
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#define AMT_STATUS_MAX (__AMT_STATUS_MAX - 1)
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/* Gateway events only */
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enum amt_event {
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AMT_EVENT_NONE,
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AMT_EVENT_RECEIVE,
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AMT_EVENT_SEND_DISCOVERY,
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AMT_EVENT_SEND_REQUEST,
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__AMT_EVENT_MAX,
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};
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struct amt_header {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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u8 type:4,
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version:4;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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u8 version:4,
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type:4;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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} __packed;
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struct amt_header_discovery {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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u32 type:4,
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version:4,
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reserved:24;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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u32 version:4,
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type:4,
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reserved:24;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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__be32 nonce;
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} __packed;
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struct amt_header_advertisement {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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u32 type:4,
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version:4,
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reserved:24;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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u32 version:4,
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type:4,
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reserved:24;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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__be32 nonce;
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__be32 ip4;
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} __packed;
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struct amt_header_request {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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u32 type:4,
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version:4,
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reserved1:7,
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p:1,
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reserved2:16;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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u32 version:4,
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type:4,
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p:1,
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reserved1:7,
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reserved2:16;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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__be32 nonce;
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} __packed;
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struct amt_header_membership_query {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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u64 type:4,
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version:4,
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reserved:6,
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l:1,
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g:1,
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response_mac:48;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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u64 version:4,
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type:4,
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g:1,
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l:1,
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reserved:6,
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response_mac:48;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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__be32 nonce;
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} __packed;
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struct amt_header_membership_update {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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u64 type:4,
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version:4,
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reserved:8,
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response_mac:48;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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u64 version:4,
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type:4,
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reserved:8,
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response_mac:48;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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__be32 nonce;
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} __packed;
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struct amt_header_mcast_data {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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u16 type:4,
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version:4,
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reserved:8;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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u16 version:4,
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type:4,
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reserved:8;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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} __packed;
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struct amt_headers {
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union {
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struct amt_header_discovery discovery;
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struct amt_header_advertisement advertisement;
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struct amt_header_request request;
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struct amt_header_membership_query query;
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struct amt_header_membership_update update;
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struct amt_header_mcast_data data;
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};
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} __packed;
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struct amt_gw_headers {
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union {
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struct amt_header_discovery discovery;
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struct amt_header_request request;
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struct amt_header_membership_update update;
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};
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} __packed;
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struct amt_relay_headers {
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union {
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struct amt_header_advertisement advertisement;
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struct amt_header_membership_query query;
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struct amt_header_mcast_data data;
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};
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} __packed;
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struct amt_skb_cb {
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struct amt_tunnel_list *tunnel;
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};
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struct amt_tunnel_list {
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struct list_head list;
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/* Protect All resources under an amt_tunne_list */
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spinlock_t lock;
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struct amt_dev *amt;
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u32 nr_groups;
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u32 nr_sources;
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enum amt_status status;
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struct delayed_work gc_wq;
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__be16 source_port;
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__be32 ip4;
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__be32 nonce;
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siphash_key_t key;
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u64 mac:48,
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reserved:16;
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struct rcu_head rcu;
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struct hlist_head groups[];
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};
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union amt_addr {
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__be32 ip4;
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#if IS_ENABLED(CONFIG_IPV6)
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struct in6_addr ip6;
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#endif
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};
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/* RFC 3810
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*
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* When the router is in EXCLUDE mode, the router state is represented
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* by the notation EXCLUDE (X,Y), where X is called the "Requested List"
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* and Y is called the "Exclude List". All sources, except those from
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* the Exclude List, will be forwarded by the router
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*/
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enum amt_source_status {
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AMT_SOURCE_STATUS_NONE,
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/* Node of Requested List */
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AMT_SOURCE_STATUS_FWD,
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/* Node of Exclude List */
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AMT_SOURCE_STATUS_D_FWD,
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};
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/* protected by gnode->lock */
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struct amt_source_node {
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struct hlist_node node;
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struct amt_group_node *gnode;
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struct delayed_work source_timer;
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union amt_addr source_addr;
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enum amt_source_status status;
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#define AMT_SOURCE_OLD 0
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#define AMT_SOURCE_NEW 1
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u8 flags;
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struct rcu_head rcu;
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};
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/* Protected by amt_tunnel_list->lock */
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struct amt_group_node {
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struct amt_dev *amt;
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union amt_addr group_addr;
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union amt_addr host_addr;
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bool v6;
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u8 filter_mode;
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u32 nr_sources;
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struct amt_tunnel_list *tunnel_list;
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struct hlist_node node;
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struct delayed_work group_timer;
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struct rcu_head rcu;
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struct hlist_head sources[];
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};
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#define AMT_MAX_EVENTS 16
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struct amt_events {
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enum amt_event event;
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struct sk_buff *skb;
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};
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struct amt_dev {
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struct net_device *dev;
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struct net_device *stream_dev;
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struct net *net;
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/* Global lock for amt device */
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spinlock_t lock;
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/* Used only in relay mode */
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struct list_head tunnel_list;
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struct gro_cells gro_cells;
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/* Protected by RTNL */
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struct delayed_work discovery_wq;
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/* Protected by RTNL */
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struct delayed_work req_wq;
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/* Protected by RTNL */
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struct delayed_work secret_wq;
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struct work_struct event_wq;
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/* AMT status */
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enum amt_status status;
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/* Generated key */
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siphash_key_t key;
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struct socket __rcu *sock;
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u32 max_groups;
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u32 max_sources;
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u32 hash_buckets;
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u32 hash_seed;
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/* Default 128 */
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u32 max_tunnels;
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/* Default 128 */
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u32 nr_tunnels;
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/* Gateway or Relay mode */
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u32 mode;
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/* Default 2268 */
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__be16 relay_port;
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/* Default 2268 */
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__be16 gw_port;
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/* Outer local ip */
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__be32 local_ip;
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/* Outer remote ip */
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__be32 remote_ip;
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/* Outer discovery ip */
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__be32 discovery_ip;
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/* Only used in gateway mode */
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__be32 nonce;
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/* Gateway sent request and received query */
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bool ready4;
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bool ready6;
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u8 req_cnt;
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u8 qi;
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u64 qrv;
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u64 qri;
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/* Used only in gateway mode */
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u64 mac:48,
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reserved:16;
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/* AMT gateway side message handler queue */
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struct amt_events events[AMT_MAX_EVENTS];
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u8 event_idx;
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u8 nr_events;
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};
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#define AMT_TOS 0xc0
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#define AMT_IPHDR_OPTS 4
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#define AMT_IP6HDR_OPTS 8
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#define AMT_GC_INTERVAL (30 * 1000)
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#define AMT_MAX_GROUP 32
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#define AMT_MAX_SOURCE 128
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#define AMT_HSIZE_SHIFT 8
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#define AMT_HSIZE (1 << AMT_HSIZE_SHIFT)
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#define AMT_DISCOVERY_TIMEOUT 5000
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#define AMT_INIT_REQ_TIMEOUT 1
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#define AMT_INIT_QUERY_INTERVAL 125
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#define AMT_MAX_REQ_TIMEOUT 120
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#define AMT_MAX_REQ_COUNT 3
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#define AMT_SECRET_TIMEOUT 60000
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#define IANA_AMT_UDP_PORT 2268
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#define AMT_MAX_TUNNELS 128
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#define AMT_MAX_REQS 128
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#define AMT_GW_HLEN (sizeof(struct iphdr) + \
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sizeof(struct udphdr) + \
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sizeof(struct amt_gw_headers))
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#define AMT_RELAY_HLEN (sizeof(struct iphdr) + \
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sizeof(struct udphdr) + \
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sizeof(struct amt_relay_headers))
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static inline bool netif_is_amt(const struct net_device *dev)
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{
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return dev->rtnl_link_ops && !strcmp(dev->rtnl_link_ops->kind, "amt");
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}
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static inline u64 amt_gmi(const struct amt_dev *amt)
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{
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return ((amt->qrv * amt->qi) + amt->qri) * 1000;
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}
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#endif /* _NET_AMT_H_ */
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