diff options
Diffstat (limited to 'net/mptcp/protocol.h')
| -rw-r--r-- | net/mptcp/protocol.h | 204 |
1 files changed, 192 insertions, 12 deletions
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h index 9f8663b30456..f733c5425552 100644 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -17,6 +17,12 @@ #define OPTION_MPTCP_MPC_SYN BIT(0) #define OPTION_MPTCP_MPC_SYNACK BIT(1) #define OPTION_MPTCP_MPC_ACK BIT(2) +#define OPTION_MPTCP_MPJ_SYN BIT(3) +#define OPTION_MPTCP_MPJ_SYNACK BIT(4) +#define OPTION_MPTCP_MPJ_ACK BIT(5) +#define OPTION_MPTCP_ADD_ADDR BIT(6) +#define OPTION_MPTCP_ADD_ADDR6 BIT(7) +#define OPTION_MPTCP_RM_ADDR BIT(8) /* MPTCP option subtypes */ #define MPTCPOPT_MP_CAPABLE 0 @@ -33,12 +39,30 @@ #define TCPOLEN_MPTCP_MPC_SYNACK 12 #define TCPOLEN_MPTCP_MPC_ACK 20 #define TCPOLEN_MPTCP_MPC_ACK_DATA 22 +#define TCPOLEN_MPTCP_MPJ_SYN 12 +#define TCPOLEN_MPTCP_MPJ_SYNACK 16 +#define TCPOLEN_MPTCP_MPJ_ACK 24 #define TCPOLEN_MPTCP_DSS_BASE 4 #define TCPOLEN_MPTCP_DSS_ACK32 4 #define TCPOLEN_MPTCP_DSS_ACK64 8 #define TCPOLEN_MPTCP_DSS_MAP32 10 #define TCPOLEN_MPTCP_DSS_MAP64 14 #define TCPOLEN_MPTCP_DSS_CHECKSUM 2 +#define TCPOLEN_MPTCP_ADD_ADDR 16 +#define TCPOLEN_MPTCP_ADD_ADDR_PORT 18 +#define TCPOLEN_MPTCP_ADD_ADDR_BASE 8 +#define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10 +#define TCPOLEN_MPTCP_ADD_ADDR6 28 +#define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30 +#define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20 +#define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22 +#define TCPOLEN_MPTCP_PORT_LEN 2 +#define TCPOLEN_MPTCP_RM_ADDR_BASE 4 + +/* MPTCP MP_JOIN flags */ +#define MPTCPOPT_BACKUP BIT(0) +#define MPTCPOPT_HMAC_LEN 20 +#define MPTCPOPT_THMAC_LEN 8 /* MPTCP MP_CAPABLE flags */ #define MPTCP_VERSION_MASK (0x0F) @@ -55,9 +79,75 @@ #define MPTCP_DSS_HAS_ACK BIT(0) #define MPTCP_DSS_FLAG_MASK (0x1F) +/* MPTCP ADD_ADDR flags */ +#define MPTCP_ADDR_ECHO BIT(0) +#define MPTCP_ADDR_HMAC_LEN 20 +#define MPTCP_ADDR_IPVERSION_4 4 +#define MPTCP_ADDR_IPVERSION_6 6 + /* MPTCP socket flags */ #define MPTCP_DATA_READY 0 #define MPTCP_SEND_SPACE 1 +#define MPTCP_WORK_RTX 2 + +static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) +{ + return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | + ((nib & 0xF) << 8) | field); +} + +#define MPTCP_PM_MAX_ADDR 4 + +struct mptcp_addr_info { + sa_family_t family; + __be16 port; + u8 id; + union { + struct in_addr addr; +#if IS_ENABLED(CONFIG_MPTCP_IPV6) + struct in6_addr addr6; +#endif + }; +}; + +enum mptcp_pm_status { + MPTCP_PM_ADD_ADDR_RECEIVED, + MPTCP_PM_ESTABLISHED, + MPTCP_PM_SUBFLOW_ESTABLISHED, +}; + +struct mptcp_pm_data { + struct mptcp_addr_info local; + struct mptcp_addr_info remote; + + spinlock_t lock; /*protects the whole PM data */ + + bool addr_signal; + bool server_side; + bool work_pending; + bool accept_addr; + bool accept_subflow; + u8 add_addr_signaled; + u8 add_addr_accepted; + u8 local_addr_used; + u8 subflows; + u8 add_addr_signal_max; + u8 add_addr_accept_max; + u8 local_addr_max; + u8 subflows_max; + u8 status; + + struct work_struct work; +}; + +struct mptcp_data_frag { + struct list_head list; + u64 data_seq; + int data_len; + int offset; + int overhead; + struct page *page; +}; /* MPTCP connection sock */ struct mptcp_sock { @@ -67,13 +157,20 @@ struct mptcp_sock { u64 remote_key; u64 write_seq; u64 ack_seq; + atomic64_t snd_una; + unsigned long timer_ival; u32 token; unsigned long flags; bool can_ack; + spinlock_t join_list_lock; + struct work_struct work; struct list_head conn_list; + struct list_head rtx_queue; + struct list_head join_list; struct skb_ext *cached_ext; /* for the next sendmsg */ struct socket *subflow; /* outgoing connect/listener/!mp_capable */ struct sock *first; + struct mptcp_pm_data pm; }; #define mptcp_for_each_subflow(__msk, __subflow) \ @@ -84,17 +181,42 @@ static inline struct mptcp_sock *mptcp_sk(const struct sock *sk) return (struct mptcp_sock *)sk; } +static inline struct mptcp_data_frag *mptcp_rtx_tail(const struct sock *sk) +{ + struct mptcp_sock *msk = mptcp_sk(sk); + + if (list_empty(&msk->rtx_queue)) + return NULL; + + return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); +} + +static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk) +{ + struct mptcp_sock *msk = mptcp_sk(sk); + + if (list_empty(&msk->rtx_queue)) + return NULL; + + return list_first_entry(&msk->rtx_queue, struct mptcp_data_frag, list); +} + struct mptcp_subflow_request_sock { struct tcp_request_sock sk; u16 mp_capable : 1, mp_join : 1, backup : 1, remote_key_valid : 1; + u8 local_id; + u8 remote_id; u64 local_key; u64 remote_key; u64 idsn; u32 token; u32 ssn_offset; + u64 thmac; + u32 local_nonce; + u32 remote_nonce; }; static inline struct mptcp_subflow_request_sock * @@ -117,14 +239,28 @@ struct mptcp_subflow_context { u32 ssn_offset; u32 map_data_len; u32 request_mptcp : 1, /* send MP_CAPABLE */ + request_join : 1, /* send MP_JOIN */ + request_bkup : 1, mp_capable : 1, /* remote is MPTCP capable */ - fourth_ack : 1, /* send initial DSS */ + mp_join : 1, /* remote is JOINing */ + fully_established : 1, /* path validated */ + pm_notified : 1, /* PM hook called for established status */ conn_finished : 1, map_valid : 1, mpc_map : 1, + backup : 1, data_avail : 1, rx_eof : 1, + data_fin_tx_enable : 1, can_ack : 1; /* only after processing the remote a key */ + u64 data_fin_tx_seq; + u32 remote_nonce; + u64 thmac; + u32 local_nonce; + u32 remote_token; + u8 hmac[MPTCPOPT_HMAC_LEN]; + u8 local_id; + u8 remote_id; struct sock *tcp_sock; /* tcp sk backpointer */ struct sock *conn; /* parent mptcp_sock */ @@ -168,6 +304,11 @@ mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) int mptcp_is_enabled(struct net *net); bool mptcp_subflow_data_available(struct sock *sk); void mptcp_subflow_init(void); + +/* called with sk socket lock held */ +int __mptcp_subflow_connect(struct sock *sk, int ifindex, + const struct mptcp_addr_info *loc, + const struct mptcp_addr_info *remote); int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock); static inline void mptcp_subflow_tcp_fallback(struct sock *sk, @@ -190,23 +331,20 @@ void mptcp_proto_init(void); int mptcp_proto_v6_init(void); #endif -struct mptcp_read_arg { - struct msghdr *msg; -}; - -int mptcp_read_actor(read_descriptor_t *desc, struct sk_buff *skb, - unsigned int offset, size_t len); - +struct sock *mptcp_sk_clone(const struct sock *sk, struct request_sock *req); void mptcp_get_options(const struct sk_buff *skb, struct tcp_options_received *opt_rx); void mptcp_finish_connect(struct sock *sk); +void mptcp_data_ready(struct sock *sk, struct sock *ssk); +bool mptcp_finish_join(struct sock *sk); +void mptcp_data_acked(struct sock *sk); int mptcp_token_new_request(struct request_sock *req); void mptcp_token_destroy_request(u32 token); int mptcp_token_new_connect(struct sock *sk); -int mptcp_token_new_accept(u32 token); -void mptcp_token_update_accept(struct sock *sk, struct sock *conn); +int mptcp_token_new_accept(u32 token, struct sock *conn); +struct mptcp_sock *mptcp_token_get_sock(u32 token); void mptcp_token_destroy(u32 token); void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); @@ -222,8 +360,48 @@ static inline void mptcp_crypto_key_gen_sha(u64 *key, u32 *token, u64 *idsn) mptcp_crypto_key_sha(*key, token, idsn); } -void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u32 nonce1, u32 nonce2, - void *hash_out); +void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); + +void mptcp_pm_init(void); +void mptcp_pm_data_init(struct mptcp_sock *msk); +void mptcp_pm_close(struct mptcp_sock *msk); +void mptcp_pm_new_connection(struct mptcp_sock *msk, int server_side); +void mptcp_pm_fully_established(struct mptcp_sock *msk); +bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); +void mptcp_pm_connection_closed(struct mptcp_sock *msk); +void mptcp_pm_subflow_established(struct mptcp_sock *msk, + struct mptcp_subflow_context *subflow); +void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id); +void mptcp_pm_add_addr_received(struct mptcp_sock *msk, + const struct mptcp_addr_info *addr); + +int mptcp_pm_announce_addr(struct mptcp_sock *msk, + const struct mptcp_addr_info *addr); +int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id); +int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 remote_id); + +static inline bool mptcp_pm_should_signal(struct mptcp_sock *msk) +{ + return READ_ONCE(msk->pm.addr_signal); +} + +static inline unsigned int mptcp_add_addr_len(int family) +{ + if (family == AF_INET) + return TCPOLEN_MPTCP_ADD_ADDR; + return TCPOLEN_MPTCP_ADD_ADDR6; +} + +bool mptcp_pm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, + struct mptcp_addr_info *saddr); +int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); + +void mptcp_pm_nl_init(void); +void mptcp_pm_nl_data_init(struct mptcp_sock *msk); +void mptcp_pm_nl_fully_established(struct mptcp_sock *msk); +void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk); +void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk); +int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb) { @@ -237,4 +415,6 @@ static inline bool before64(__u64 seq1, __u64 seq2) #define after64(seq2, seq1) before64(seq1, seq2) +void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); + #endif /* __MPTCP_PROTOCOL_H */ |