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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>
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_TEARDOWM,
__AMT_MSG_MAX,
};
#define AMT_MSG_MAX (__AMT_MSG_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)
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_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[];
};
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;
/* 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;
};
#define AMT_TOS 0xc0
#define AMT_IPHDR_OPTS 4
#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_ */
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