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