| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* Multipath TCP |
| * |
| * Copyright (c) 2017 - 2019, Intel Corporation. |
| */ |
| |
| #ifndef __MPTCP_PROTOCOL_H |
| #define __MPTCP_PROTOCOL_H |
| |
| #include <linux/random.h> |
| #include <net/tcp.h> |
| #include <net/inet_connection_sock.h> |
| #include <uapi/linux/mptcp.h> |
| #include <net/genetlink.h> |
| |
| #include "mptcp_pm_gen.h" |
| |
| #define MPTCP_SUPPORTED_VERSION 1 |
| |
| /* MPTCP option bits */ |
| #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_RM_ADDR BIT(7) |
| #define OPTION_MPTCP_FASTCLOSE BIT(8) |
| #define OPTION_MPTCP_PRIO BIT(9) |
| #define OPTION_MPTCP_RST BIT(10) |
| #define OPTION_MPTCP_DSS BIT(11) |
| #define OPTION_MPTCP_FAIL BIT(12) |
| |
| #define OPTION_MPTCP_CSUMREQD BIT(13) |
| |
| #define OPTIONS_MPTCP_MPC (OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_SYNACK | \ |
| OPTION_MPTCP_MPC_ACK) |
| #define OPTIONS_MPTCP_MPJ (OPTION_MPTCP_MPJ_SYN | OPTION_MPTCP_MPJ_SYNACK | \ |
| OPTION_MPTCP_MPJ_ACK) |
| |
| /* MPTCP option subtypes */ |
| #define MPTCPOPT_MP_CAPABLE 0 |
| #define MPTCPOPT_MP_JOIN 1 |
| #define MPTCPOPT_DSS 2 |
| #define MPTCPOPT_ADD_ADDR 3 |
| #define MPTCPOPT_RM_ADDR 4 |
| #define MPTCPOPT_MP_PRIO 5 |
| #define MPTCPOPT_MP_FAIL 6 |
| #define MPTCPOPT_MP_FASTCLOSE 7 |
| #define MPTCPOPT_RST 8 |
| |
| /* MPTCP suboption lengths */ |
| #define TCPOLEN_MPTCP_MPC_SYN 4 |
| #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_PORT_ALIGN 2 |
| #define TCPOLEN_MPTCP_RM_ADDR_BASE 3 |
| #define TCPOLEN_MPTCP_PRIO 3 |
| #define TCPOLEN_MPTCP_PRIO_ALIGN 4 |
| #define TCPOLEN_MPTCP_FASTCLOSE 12 |
| #define TCPOLEN_MPTCP_RST 4 |
| #define TCPOLEN_MPTCP_FAIL 12 |
| |
| #define TCPOLEN_MPTCP_MPC_ACK_DATA_CSUM (TCPOLEN_MPTCP_DSS_CHECKSUM + TCPOLEN_MPTCP_MPC_ACK_DATA) |
| |
| /* MPTCP MP_JOIN flags */ |
| #define MPTCPOPT_BACKUP BIT(0) |
| #define MPTCPOPT_THMAC_LEN 8 |
| |
| /* MPTCP MP_CAPABLE flags */ |
| #define MPTCP_VERSION_MASK (0x0F) |
| #define MPTCP_CAP_CHECKSUM_REQD BIT(7) |
| #define MPTCP_CAP_EXTENSIBILITY BIT(6) |
| #define MPTCP_CAP_DENY_JOIN_ID0 BIT(5) |
| #define MPTCP_CAP_HMAC_SHA256 BIT(0) |
| #define MPTCP_CAP_FLAG_MASK (0x1F) |
| |
| /* MPTCP DSS flags */ |
| #define MPTCP_DSS_DATA_FIN BIT(4) |
| #define MPTCP_DSS_DSN64 BIT(3) |
| #define MPTCP_DSS_HAS_MAP BIT(2) |
| #define MPTCP_DSS_ACK64 BIT(1) |
| #define MPTCP_DSS_HAS_ACK BIT(0) |
| #define MPTCP_DSS_FLAG_MASK (0x1F) |
| |
| /* MPTCP ADD_ADDR flags */ |
| #define MPTCP_ADDR_ECHO BIT(0) |
| |
| /* MPTCP MP_PRIO flags */ |
| #define MPTCP_PRIO_BKUP BIT(0) |
| |
| /* MPTCP TCPRST flags */ |
| #define MPTCP_RST_TRANSIENT BIT(0) |
| |
| /* MPTCP socket atomic flags */ |
| #define MPTCP_NOSPACE 1 |
| #define MPTCP_WORK_RTX 2 |
| #define MPTCP_FALLBACK_DONE 4 |
| #define MPTCP_WORK_CLOSE_SUBFLOW 5 |
| |
| /* MPTCP socket release cb flags */ |
| #define MPTCP_PUSH_PENDING 1 |
| #define MPTCP_CLEAN_UNA 2 |
| #define MPTCP_ERROR_REPORT 3 |
| #define MPTCP_RETRANSMIT 4 |
| #define MPTCP_FLUSH_JOIN_LIST 5 |
| #define MPTCP_SYNC_STATE 6 |
| #define MPTCP_SYNC_SNDBUF 7 |
| |
| struct mptcp_skb_cb { |
| u64 map_seq; |
| u64 end_seq; |
| u32 offset; |
| u8 has_rxtstamp:1; |
| }; |
| |
| #define MPTCP_SKB_CB(__skb) ((struct mptcp_skb_cb *)&((__skb)->cb[0])) |
| |
| static inline bool before64(__u64 seq1, __u64 seq2) |
| { |
| return (__s64)(seq1 - seq2) < 0; |
| } |
| |
| #define after64(seq2, seq1) before64(seq1, seq2) |
| |
| struct mptcp_options_received { |
| u64 sndr_key; |
| u64 rcvr_key; |
| u64 data_ack; |
| u64 data_seq; |
| u32 subflow_seq; |
| u16 data_len; |
| __sum16 csum; |
| u16 suboptions; |
| u32 token; |
| u32 nonce; |
| u16 use_map:1, |
| dsn64:1, |
| data_fin:1, |
| use_ack:1, |
| ack64:1, |
| mpc_map:1, |
| reset_reason:4, |
| reset_transient:1, |
| echo:1, |
| backup:1, |
| deny_join_id0:1, |
| __unused:2; |
| u8 join_id; |
| u64 thmac; |
| u8 hmac[MPTCPOPT_HMAC_LEN]; |
| struct mptcp_addr_info addr; |
| struct mptcp_rm_list rm_list; |
| u64 ahmac; |
| u64 fail_seq; |
| }; |
| |
| 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); |
| } |
| |
| enum mptcp_pm_status { |
| MPTCP_PM_ADD_ADDR_RECEIVED, |
| MPTCP_PM_ADD_ADDR_SEND_ACK, |
| MPTCP_PM_RM_ADDR_RECEIVED, |
| MPTCP_PM_ESTABLISHED, |
| MPTCP_PM_SUBFLOW_ESTABLISHED, |
| MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */ |
| MPTCP_PM_MPC_ENDPOINT_ACCOUNTED /* persistent status, set after MPC local address is |
| * accounted int id_avail_bitmap |
| */ |
| }; |
| |
| enum mptcp_pm_type { |
| MPTCP_PM_TYPE_KERNEL = 0, |
| MPTCP_PM_TYPE_USERSPACE, |
| |
| __MPTCP_PM_TYPE_NR, |
| __MPTCP_PM_TYPE_MAX = __MPTCP_PM_TYPE_NR - 1, |
| }; |
| |
| /* Status bits below MPTCP_PM_ALREADY_ESTABLISHED need pm worker actions */ |
| #define MPTCP_PM_WORK_MASK ((1 << MPTCP_PM_ALREADY_ESTABLISHED) - 1) |
| |
| enum mptcp_addr_signal_status { |
| MPTCP_ADD_ADDR_SIGNAL, |
| MPTCP_ADD_ADDR_ECHO, |
| MPTCP_RM_ADDR_SIGNAL, |
| }; |
| |
| /* max value of mptcp_addr_info.id */ |
| #define MPTCP_PM_MAX_ADDR_ID U8_MAX |
| |
| struct mptcp_pm_data { |
| struct mptcp_addr_info local; |
| struct mptcp_addr_info remote; |
| struct list_head anno_list; |
| struct list_head userspace_pm_local_addr_list; |
| |
| spinlock_t lock; /*protects the whole PM data */ |
| |
| u8 addr_signal; |
| bool server_side; |
| bool work_pending; |
| bool accept_addr; |
| bool accept_subflow; |
| bool remote_deny_join_id0; |
| u8 add_addr_signaled; |
| u8 add_addr_accepted; |
| u8 local_addr_used; |
| u8 pm_type; |
| u8 subflows; |
| u8 status; |
| DECLARE_BITMAP(id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); |
| struct mptcp_rm_list rm_list_tx; |
| struct mptcp_rm_list rm_list_rx; |
| }; |
| |
| struct mptcp_pm_addr_entry { |
| struct list_head list; |
| struct mptcp_addr_info addr; |
| u8 flags; |
| int ifindex; |
| struct socket *lsk; |
| }; |
| |
| struct mptcp_data_frag { |
| struct list_head list; |
| u64 data_seq; |
| u16 data_len; |
| u16 offset; |
| u16 overhead; |
| u16 already_sent; |
| struct page *page; |
| }; |
| |
| /* MPTCP connection sock */ |
| struct mptcp_sock { |
| /* inet_connection_sock must be the first member */ |
| struct inet_connection_sock sk; |
| u64 local_key; /* protected by the first subflow socket lock |
| * lockless access read |
| */ |
| u64 remote_key; /* same as above */ |
| u64 write_seq; |
| u64 bytes_sent; |
| u64 snd_nxt; |
| u64 bytes_received; |
| u64 ack_seq; |
| atomic64_t rcv_wnd_sent; |
| u64 rcv_data_fin_seq; |
| u64 bytes_retrans; |
| u64 bytes_consumed; |
| int rmem_fwd_alloc; |
| int snd_burst; |
| int old_wspace; |
| u64 recovery_snd_nxt; /* in recovery mode accept up to this seq; |
| * recovery related fields are under data_lock |
| * protection |
| */ |
| u64 bytes_acked; |
| u64 snd_una; |
| u64 wnd_end; |
| unsigned long timer_ival; |
| u32 token; |
| int rmem_released; |
| unsigned long flags; |
| unsigned long cb_flags; |
| bool recovery; /* closing subflow write queue reinjected */ |
| bool can_ack; |
| bool fully_established; |
| bool rcv_data_fin; |
| bool snd_data_fin_enable; |
| bool rcv_fastclose; |
| bool use_64bit_ack; /* Set when we received a 64-bit DSN */ |
| bool csum_enabled; |
| bool allow_infinite_fallback; |
| u8 pending_state; /* A subflow asked to set this sk_state, |
| * protected by the msk data lock |
| */ |
| u8 mpc_endpoint_id; |
| u8 recvmsg_inq:1, |
| cork:1, |
| nodelay:1, |
| fastopening:1, |
| in_accept_queue:1, |
| free_first:1, |
| rcvspace_init:1; |
| struct work_struct work; |
| struct sk_buff *ooo_last_skb; |
| struct rb_root out_of_order_queue; |
| struct sk_buff_head receive_queue; |
| struct list_head conn_list; |
| struct list_head rtx_queue; |
| struct mptcp_data_frag *first_pending; |
| struct list_head join_list; |
| struct sock *first; /* The mptcp ops can safely dereference, using suitable |
| * ONCE annotation, the subflow outside the socket |
| * lock as such sock is freed after close(). |
| */ |
| struct mptcp_pm_data pm; |
| struct mptcp_sched_ops *sched; |
| struct { |
| u32 space; /* bytes copied in last measurement window */ |
| u32 copied; /* bytes copied in this measurement window */ |
| u64 time; /* start time of measurement window */ |
| u64 rtt_us; /* last maximum rtt of subflows */ |
| } rcvq_space; |
| u8 scaling_ratio; |
| |
| u32 subflow_id; |
| u32 setsockopt_seq; |
| char ca_name[TCP_CA_NAME_MAX]; |
| }; |
| |
| #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) |
| #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) |
| |
| #define mptcp_for_each_subflow(__msk, __subflow) \ |
| list_for_each_entry(__subflow, &((__msk)->conn_list), node) |
| #define mptcp_for_each_subflow_safe(__msk, __subflow, __tmp) \ |
| list_for_each_entry_safe(__subflow, __tmp, &((__msk)->conn_list), node) |
| |
| static inline void msk_owned_by_me(const struct mptcp_sock *msk) |
| { |
| sock_owned_by_me((const struct sock *)msk); |
| } |
| |
| #ifdef CONFIG_DEBUG_NET |
| /* MPTCP-specific: we might (indirectly) call this helper with the wrong sk */ |
| #undef tcp_sk |
| #define tcp_sk(ptr) ({ \ |
| typeof(ptr) _ptr = (ptr); \ |
| WARN_ON(_ptr->sk_protocol != IPPROTO_TCP); \ |
| container_of_const(_ptr, struct tcp_sock, inet_conn.icsk_inet.sk); \ |
| }) |
| #define mptcp_sk(ptr) ({ \ |
| typeof(ptr) _ptr = (ptr); \ |
| WARN_ON(_ptr->sk_protocol != IPPROTO_MPTCP); \ |
| container_of_const(_ptr, struct mptcp_sock, sk.icsk_inet.sk); \ |
| }) |
| |
| #else /* !CONFIG_DEBUG_NET */ |
| #define mptcp_sk(ptr) container_of_const(ptr, struct mptcp_sock, sk.icsk_inet.sk) |
| #endif |
| |
| /* the msk socket don't use the backlog, also account for the bulk |
| * free memory |
| */ |
| static inline int __mptcp_rmem(const struct sock *sk) |
| { |
| return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released); |
| } |
| |
| static inline int mptcp_win_from_space(const struct sock *sk, int space) |
| { |
| return __tcp_win_from_space(mptcp_sk(sk)->scaling_ratio, space); |
| } |
| |
| static inline int __mptcp_space(const struct sock *sk) |
| { |
| return mptcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk)); |
| } |
| |
| static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) |
| { |
| const struct mptcp_sock *msk = mptcp_sk(sk); |
| |
| return READ_ONCE(msk->first_pending); |
| } |
| |
| static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) |
| { |
| struct mptcp_sock *msk = mptcp_sk(sk); |
| struct mptcp_data_frag *cur; |
| |
| cur = msk->first_pending; |
| return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : |
| list_next_entry(cur, list); |
| } |
| |
| static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) |
| { |
| const struct mptcp_sock *msk = mptcp_sk(sk); |
| |
| if (!msk->first_pending) |
| return NULL; |
| |
| if (WARN_ON_ONCE(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(struct sock *sk) |
| { |
| struct mptcp_sock *msk = mptcp_sk(sk); |
| |
| if (msk->snd_una == msk->snd_nxt) |
| return NULL; |
| |
| return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); |
| } |
| |
| struct csum_pseudo_header { |
| __be64 data_seq; |
| __be32 subflow_seq; |
| __be16 data_len; |
| __sum16 csum; |
| }; |
| |
| struct mptcp_subflow_request_sock { |
| struct tcp_request_sock sk; |
| u16 mp_capable : 1, |
| mp_join : 1, |
| backup : 1, |
| csum_reqd : 1, |
| allow_join_id0 : 1; |
| u8 local_id; |
| u8 remote_id; |
| u64 local_key; |
| u64 idsn; |
| u32 token; |
| u32 ssn_offset; |
| u64 thmac; |
| u32 local_nonce; |
| u32 remote_nonce; |
| struct mptcp_sock *msk; |
| struct hlist_nulls_node token_node; |
| }; |
| |
| static inline struct mptcp_subflow_request_sock * |
| mptcp_subflow_rsk(const struct request_sock *rsk) |
| { |
| return (struct mptcp_subflow_request_sock *)rsk; |
| } |
| |
| struct mptcp_delegated_action { |
| struct napi_struct napi; |
| struct list_head head; |
| }; |
| |
| DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); |
| |
| #define MPTCP_DELEGATE_SCHEDULED 0 |
| #define MPTCP_DELEGATE_SEND 1 |
| #define MPTCP_DELEGATE_ACK 2 |
| #define MPTCP_DELEGATE_SNDBUF 3 |
| |
| #define MPTCP_DELEGATE_ACTIONS_MASK (~BIT(MPTCP_DELEGATE_SCHEDULED)) |
| /* MPTCP subflow context */ |
| struct mptcp_subflow_context { |
| struct list_head node;/* conn_list of subflows */ |
| |
| struct_group(reset, |
| |
| unsigned long avg_pacing_rate; /* protected by msk socket lock */ |
| u64 local_key; |
| u64 remote_key; |
| u64 idsn; |
| u64 map_seq; |
| u32 snd_isn; |
| u32 token; |
| u32 rel_write_seq; |
| u32 map_subflow_seq; |
| u32 ssn_offset; |
| u32 map_data_len; |
| __wsum map_data_csum; |
| u32 map_csum_len; |
| u32 request_mptcp : 1, /* send MP_CAPABLE */ |
| request_join : 1, /* send MP_JOIN */ |
| request_bkup : 1, |
| mp_capable : 1, /* remote is MPTCP capable */ |
| 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, |
| map_csum_reqd : 1, |
| map_data_fin : 1, |
| mpc_map : 1, |
| backup : 1, |
| send_mp_prio : 1, |
| send_mp_fail : 1, |
| send_fastclose : 1, |
| send_infinite_map : 1, |
| remote_key_valid : 1, /* received the peer key from */ |
| disposable : 1, /* ctx can be free at ulp release time */ |
| stale : 1, /* unable to snd/rcv data, do not use for xmit */ |
| valid_csum_seen : 1, /* at least one csum validated */ |
| is_mptfo : 1, /* subflow is doing TFO */ |
| __unused : 10; |
| bool data_avail; |
| bool scheduled; |
| u32 remote_nonce; |
| u64 thmac; |
| u32 local_nonce; |
| u32 remote_token; |
| union { |
| u8 hmac[MPTCPOPT_HMAC_LEN]; /* MPJ subflow only */ |
| u64 iasn; /* initial ack sequence number, MPC subflows only */ |
| }; |
| s16 local_id; /* if negative not initialized yet */ |
| u8 remote_id; |
| u8 reset_seen:1; |
| u8 reset_transient:1; |
| u8 reset_reason:4; |
| u8 stale_count; |
| |
| u32 subflow_id; |
| |
| long delegated_status; |
| unsigned long fail_tout; |
| |
| ); |
| |
| struct list_head delegated_node; /* link into delegated_action, protected by local BH */ |
| |
| u32 setsockopt_seq; |
| u32 stale_rcv_tstamp; |
| int cached_sndbuf; /* sndbuf size when last synced with the msk sndbuf, |
| * protected by the msk socket lock |
| */ |
| |
| struct sock *tcp_sock; /* tcp sk backpointer */ |
| struct sock *conn; /* parent mptcp_sock */ |
| const struct inet_connection_sock_af_ops *icsk_af_ops; |
| void (*tcp_state_change)(struct sock *sk); |
| void (*tcp_error_report)(struct sock *sk); |
| |
| struct rcu_head rcu; |
| }; |
| |
| static inline struct mptcp_subflow_context * |
| mptcp_subflow_ctx(const struct sock *sk) |
| { |
| struct inet_connection_sock *icsk = inet_csk(sk); |
| |
| /* Use RCU on icsk_ulp_data only for sock diag code */ |
| return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; |
| } |
| |
| static inline struct sock * |
| mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) |
| { |
| return subflow->tcp_sock; |
| } |
| |
| static inline void |
| mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow) |
| { |
| memset(&subflow->reset, 0, sizeof(subflow->reset)); |
| subflow->request_mptcp = 1; |
| WRITE_ONCE(subflow->local_id, -1); |
| } |
| |
| static inline u64 |
| mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) |
| { |
| return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - |
| subflow->ssn_offset - |
| subflow->map_subflow_seq; |
| } |
| |
| static inline u64 |
| mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) |
| { |
| return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); |
| } |
| |
| void mptcp_subflow_process_delegated(struct sock *ssk, long actions); |
| |
| static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action) |
| { |
| long old, set_bits = BIT(MPTCP_DELEGATE_SCHEDULED) | BIT(action); |
| struct mptcp_delegated_action *delegated; |
| bool schedule; |
| |
| /* the caller held the subflow bh socket lock */ |
| lockdep_assert_in_softirq(); |
| |
| /* The implied barrier pairs with tcp_release_cb_override() |
| * mptcp_napi_poll(), and ensures the below list check sees list |
| * updates done prior to delegated status bits changes |
| */ |
| old = set_mask_bits(&subflow->delegated_status, 0, set_bits); |
| if (!(old & BIT(MPTCP_DELEGATE_SCHEDULED))) { |
| if (WARN_ON_ONCE(!list_empty(&subflow->delegated_node))) |
| return; |
| |
| delegated = this_cpu_ptr(&mptcp_delegated_actions); |
| schedule = list_empty(&delegated->head); |
| list_add_tail(&subflow->delegated_node, &delegated->head); |
| sock_hold(mptcp_subflow_tcp_sock(subflow)); |
| if (schedule) |
| napi_schedule(&delegated->napi); |
| } |
| } |
| |
| static inline struct mptcp_subflow_context * |
| mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) |
| { |
| struct mptcp_subflow_context *ret; |
| |
| if (list_empty(&delegated->head)) |
| return NULL; |
| |
| ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); |
| list_del_init(&ret->delegated_node); |
| return ret; |
| } |
| |
| int mptcp_is_enabled(const struct net *net); |
| unsigned int mptcp_get_add_addr_timeout(const struct net *net); |
| int mptcp_is_checksum_enabled(const struct net *net); |
| int mptcp_allow_join_id0(const struct net *net); |
| unsigned int mptcp_stale_loss_cnt(const struct net *net); |
| unsigned int mptcp_close_timeout(const struct sock *sk); |
| int mptcp_get_pm_type(const struct net *net); |
| const char *mptcp_get_scheduler(const struct net *net); |
| void __mptcp_subflow_fully_established(struct mptcp_sock *msk, |
| struct mptcp_subflow_context *subflow, |
| const struct mptcp_options_received *mp_opt); |
| bool __mptcp_retransmit_pending_data(struct sock *sk); |
| void mptcp_check_and_set_pending(struct sock *sk); |
| void __mptcp_push_pending(struct sock *sk, unsigned int flags); |
| bool mptcp_subflow_data_available(struct sock *sk); |
| void __init mptcp_subflow_init(void); |
| void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); |
| void mptcp_close_ssk(struct sock *sk, struct sock *ssk, |
| struct mptcp_subflow_context *subflow); |
| void __mptcp_subflow_send_ack(struct sock *ssk); |
| void mptcp_subflow_reset(struct sock *ssk); |
| void mptcp_subflow_queue_clean(struct sock *sk, struct sock *ssk); |
| void mptcp_sock_graft(struct sock *sk, struct socket *parent); |
| struct sock *__mptcp_nmpc_sk(struct mptcp_sock *msk); |
| bool __mptcp_close(struct sock *sk, long timeout); |
| void mptcp_cancel_work(struct sock *sk); |
| void __mptcp_unaccepted_force_close(struct sock *sk); |
| void mptcp_set_owner_r(struct sk_buff *skb, struct sock *sk); |
| void mptcp_set_state(struct sock *sk, int state); |
| |
| bool mptcp_addresses_equal(const struct mptcp_addr_info *a, |
| const struct mptcp_addr_info *b, bool use_port); |
| void mptcp_local_address(const struct sock_common *skc, struct mptcp_addr_info *addr); |
| |
| /* called with sk socket lock held */ |
| int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, |
| const struct mptcp_addr_info *remote); |
| int mptcp_subflow_create_socket(struct sock *sk, unsigned short family, |
| struct socket **new_sock); |
| void mptcp_info2sockaddr(const struct mptcp_addr_info *info, |
| struct sockaddr_storage *addr, |
| unsigned short family); |
| struct mptcp_sched_ops *mptcp_sched_find(const char *name); |
| int mptcp_register_scheduler(struct mptcp_sched_ops *sched); |
| void mptcp_unregister_scheduler(struct mptcp_sched_ops *sched); |
| void mptcp_sched_init(void); |
| int mptcp_init_sched(struct mptcp_sock *msk, |
| struct mptcp_sched_ops *sched); |
| void mptcp_release_sched(struct mptcp_sock *msk); |
| void mptcp_subflow_set_scheduled(struct mptcp_subflow_context *subflow, |
| bool scheduled); |
| struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk); |
| struct sock *mptcp_subflow_get_retrans(struct mptcp_sock *msk); |
| int mptcp_sched_get_send(struct mptcp_sock *msk); |
| int mptcp_sched_get_retrans(struct mptcp_sock *msk); |
| |
| static inline u64 mptcp_data_avail(const struct mptcp_sock *msk) |
| { |
| return READ_ONCE(msk->bytes_received) - READ_ONCE(msk->bytes_consumed); |
| } |
| |
| static inline bool mptcp_epollin_ready(const struct sock *sk) |
| { |
| /* mptcp doesn't have to deal with small skbs in the receive queue, |
| * at it can always coalesce them |
| */ |
| return (mptcp_data_avail(mptcp_sk(sk)) >= sk->sk_rcvlowat) || |
| (mem_cgroup_sockets_enabled && sk->sk_memcg && |
| mem_cgroup_under_socket_pressure(sk->sk_memcg)) || |
| READ_ONCE(tcp_memory_pressure); |
| } |
| |
| int mptcp_set_rcvlowat(struct sock *sk, int val); |
| |
| static inline bool __tcp_can_send(const struct sock *ssk) |
| { |
| /* only send if our side has not closed yet */ |
| return ((1 << inet_sk_state_load(ssk)) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); |
| } |
| |
| static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow) |
| { |
| /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ |
| if (subflow->request_join && !subflow->fully_established) |
| return false; |
| |
| return __tcp_can_send(mptcp_subflow_tcp_sock(subflow)); |
| } |
| |
| void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow); |
| |
| bool mptcp_subflow_active(struct mptcp_subflow_context *subflow); |
| |
| void mptcp_subflow_drop_ctx(struct sock *ssk); |
| |
| static inline void mptcp_subflow_tcp_fallback(struct sock *sk, |
| struct mptcp_subflow_context *ctx) |
| { |
| sk->sk_data_ready = sock_def_readable; |
| sk->sk_state_change = ctx->tcp_state_change; |
| sk->sk_write_space = sk_stream_write_space; |
| sk->sk_error_report = ctx->tcp_error_report; |
| |
| inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; |
| } |
| |
| void __init mptcp_proto_init(void); |
| #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
| int __init mptcp_proto_v6_init(void); |
| #endif |
| |
| struct sock *mptcp_sk_clone_init(const struct sock *sk, |
| const struct mptcp_options_received *mp_opt, |
| struct sock *ssk, |
| struct request_sock *req); |
| void mptcp_get_options(const struct sk_buff *skb, |
| struct mptcp_options_received *mp_opt); |
| |
| void mptcp_finish_connect(struct sock *sk); |
| void __mptcp_sync_state(struct sock *sk, int state); |
| void mptcp_reset_tout_timer(struct mptcp_sock *msk, unsigned long fail_tout); |
| |
| static inline void mptcp_stop_tout_timer(struct sock *sk) |
| { |
| if (!inet_csk(sk)->icsk_mtup.probe_timestamp) |
| return; |
| |
| sk_stop_timer(sk, &sk->sk_timer); |
| inet_csk(sk)->icsk_mtup.probe_timestamp = 0; |
| } |
| |
| static inline void mptcp_set_close_tout(struct sock *sk, unsigned long tout) |
| { |
| /* avoid 0 timestamp, as that means no close timeout */ |
| inet_csk(sk)->icsk_mtup.probe_timestamp = tout ? : 1; |
| } |
| |
| static inline void mptcp_start_tout_timer(struct sock *sk) |
| { |
| mptcp_set_close_tout(sk, tcp_jiffies32); |
| mptcp_reset_tout_timer(mptcp_sk(sk), 0); |
| } |
| |
| static inline bool mptcp_is_fully_established(struct sock *sk) |
| { |
| return inet_sk_state_load(sk) == TCP_ESTABLISHED && |
| READ_ONCE(mptcp_sk(sk)->fully_established); |
| } |
| |
| void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); |
| void mptcp_data_ready(struct sock *sk, struct sock *ssk); |
| bool mptcp_finish_join(struct sock *sk); |
| bool mptcp_schedule_work(struct sock *sk); |
| int mptcp_setsockopt(struct sock *sk, int level, int optname, |
| sockptr_t optval, unsigned int optlen); |
| int mptcp_getsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, int __user *option); |
| |
| u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq); |
| static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit) |
| { |
| if (use_64bit) |
| return cur_seq; |
| |
| return __mptcp_expand_seq(old_seq, cur_seq); |
| } |
| void __mptcp_check_push(struct sock *sk, struct sock *ssk); |
| void __mptcp_data_acked(struct sock *sk); |
| void __mptcp_error_report(struct sock *sk); |
| bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); |
| static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) |
| { |
| return READ_ONCE(msk->snd_data_fin_enable) && |
| READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); |
| } |
| |
| static inline void __mptcp_sync_sndbuf(struct sock *sk) |
| { |
| struct mptcp_subflow_context *subflow; |
| int ssk_sndbuf, new_sndbuf; |
| |
| if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) |
| return; |
| |
| new_sndbuf = sock_net(sk)->ipv4.sysctl_tcp_wmem[0]; |
| mptcp_for_each_subflow(mptcp_sk(sk), subflow) { |
| ssk_sndbuf = READ_ONCE(mptcp_subflow_tcp_sock(subflow)->sk_sndbuf); |
| |
| subflow->cached_sndbuf = ssk_sndbuf; |
| new_sndbuf += ssk_sndbuf; |
| } |
| |
| /* the msk max wmem limit is <nr_subflows> * tcp wmem[2] */ |
| WRITE_ONCE(sk->sk_sndbuf, new_sndbuf); |
| } |
| |
| /* The called held both the msk socket and the subflow socket locks, |
| * possibly under BH |
| */ |
| static inline void __mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) |
| { |
| struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); |
| |
| if (READ_ONCE(ssk->sk_sndbuf) != subflow->cached_sndbuf) |
| __mptcp_sync_sndbuf(sk); |
| } |
| |
| /* the caller held only the subflow socket lock, either in process or |
| * BH context. Additionally this can be called under the msk data lock, |
| * so we can't acquire such lock here: let the delegate action acquires |
| * the needed locks in suitable order. |
| */ |
| static inline void mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) |
| { |
| struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); |
| |
| if (likely(READ_ONCE(ssk->sk_sndbuf) == subflow->cached_sndbuf)) |
| return; |
| |
| local_bh_disable(); |
| mptcp_subflow_delegate(subflow, MPTCP_DELEGATE_SNDBUF); |
| local_bh_enable(); |
| } |
| |
| static inline void mptcp_write_space(struct sock *sk) |
| { |
| if (sk_stream_is_writeable(sk)) { |
| /* pairs with memory barrier in mptcp_poll */ |
| smp_mb(); |
| if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags)) |
| sk_stream_write_space(sk); |
| } |
| } |
| |
| void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags); |
| |
| #define MPTCP_TOKEN_MAX_RETRIES 4 |
| |
| void __init mptcp_token_init(void); |
| static inline void mptcp_token_init_request(struct request_sock *req) |
| { |
| mptcp_subflow_rsk(req)->token_node.pprev = NULL; |
| } |
| |
| int mptcp_token_new_request(struct request_sock *req); |
| void mptcp_token_destroy_request(struct request_sock *req); |
| int mptcp_token_new_connect(struct sock *ssk); |
| void mptcp_token_accept(struct mptcp_subflow_request_sock *r, |
| struct mptcp_sock *msk); |
| bool mptcp_token_exists(u32 token); |
| struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token); |
| struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, |
| long *s_num); |
| void mptcp_token_destroy(struct mptcp_sock *msk); |
| |
| void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); |
| |
| void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); |
| __sum16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum); |
| |
| void __init mptcp_pm_init(void); |
| void mptcp_pm_data_init(struct mptcp_sock *msk); |
| void mptcp_pm_data_reset(struct mptcp_sock *msk); |
| int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info, |
| struct mptcp_addr_info *addr); |
| int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info, |
| bool require_family, |
| struct mptcp_pm_addr_entry *entry); |
| bool mptcp_pm_addr_families_match(const struct sock *sk, |
| const struct mptcp_addr_info *loc, |
| const struct mptcp_addr_info *rem); |
| void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); |
| void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); |
| void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); |
| void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk); |
| 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); |
| bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk); |
| void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, |
| const struct mptcp_subflow_context *subflow); |
| void mptcp_pm_add_addr_received(const struct sock *ssk, |
| const struct mptcp_addr_info *addr); |
| void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, |
| const struct mptcp_addr_info *addr); |
| void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); |
| void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk); |
| void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, |
| const struct mptcp_rm_list *rm_list); |
| void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); |
| void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq); |
| int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, |
| struct mptcp_addr_info *addr, |
| struct mptcp_addr_info *rem, |
| u8 bkup); |
| bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, |
| const struct mptcp_addr_info *addr); |
| void mptcp_pm_free_anno_list(struct mptcp_sock *msk); |
| bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); |
| struct mptcp_pm_add_entry * |
| mptcp_pm_del_add_timer(struct mptcp_sock *msk, |
| const struct mptcp_addr_info *addr, bool check_id); |
| struct mptcp_pm_add_entry * |
| mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk, |
| const struct mptcp_addr_info *addr); |
| int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, |
| unsigned int id, |
| u8 *flags, int *ifindex); |
| int mptcp_pm_nl_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id, |
| u8 *flags, int *ifindex); |
| int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, |
| unsigned int id, |
| u8 *flags, int *ifindex); |
| int mptcp_pm_set_flags(struct net *net, struct nlattr *token, |
| struct mptcp_pm_addr_entry *loc, |
| struct mptcp_pm_addr_entry *rem, u8 bkup); |
| int mptcp_pm_nl_set_flags(struct net *net, struct mptcp_pm_addr_entry *addr, u8 bkup); |
| int mptcp_userspace_pm_set_flags(struct net *net, struct nlattr *token, |
| struct mptcp_pm_addr_entry *loc, |
| struct mptcp_pm_addr_entry *rem, u8 bkup); |
| int mptcp_pm_announce_addr(struct mptcp_sock *msk, |
| const struct mptcp_addr_info *addr, |
| bool echo); |
| int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); |
| int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); |
| void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list); |
| void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk, |
| struct list_head *rm_list); |
| |
| void mptcp_free_local_addr_list(struct mptcp_sock *msk); |
| |
| void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, |
| const struct sock *ssk, gfp_t gfp); |
| void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_info *info); |
| void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); |
| void mptcp_event_pm_listener(const struct sock *ssk, |
| enum mptcp_event_type event); |
| bool mptcp_userspace_pm_active(const struct mptcp_sock *msk); |
| |
| void __mptcp_fastopen_gen_msk_ackseq(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow, |
| const struct mptcp_options_received *mp_opt); |
| void mptcp_fastopen_subflow_synack_set_params(struct mptcp_subflow_context *subflow, |
| struct request_sock *req); |
| |
| static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) |
| { |
| return READ_ONCE(msk->pm.addr_signal) & |
| (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO)); |
| } |
| |
| static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk) |
| { |
| return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); |
| } |
| |
| static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) |
| { |
| return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); |
| } |
| |
| static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) |
| { |
| return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); |
| } |
| |
| static inline bool mptcp_pm_is_userspace(const struct mptcp_sock *msk) |
| { |
| return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_USERSPACE; |
| } |
| |
| static inline bool mptcp_pm_is_kernel(const struct mptcp_sock *msk) |
| { |
| return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_KERNEL; |
| } |
| |
| static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) |
| { |
| u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; |
| |
| if (family == AF_INET6) |
| len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; |
| if (!echo) |
| len += MPTCPOPT_THMAC_LEN; |
| /* account for 2 trailing 'nop' options */ |
| if (port) |
| len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; |
| |
| return len; |
| } |
| |
| static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) |
| { |
| if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) |
| return -EINVAL; |
| |
| return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; |
| } |
| |
| bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb, |
| unsigned int opt_size, unsigned int remaining, |
| struct mptcp_addr_info *addr, bool *echo, |
| bool *drop_other_suboptions); |
| bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, |
| struct mptcp_rm_list *rm_list); |
| int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); |
| int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); |
| int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); |
| |
| static inline u8 subflow_get_local_id(const struct mptcp_subflow_context *subflow) |
| { |
| int local_id = READ_ONCE(subflow->local_id); |
| |
| if (local_id < 0) |
| return 0; |
| return local_id; |
| } |
| |
| void __init mptcp_pm_nl_init(void); |
| void mptcp_pm_nl_work(struct mptcp_sock *msk); |
| void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, |
| const struct mptcp_rm_list *rm_list); |
| unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk); |
| unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk); |
| unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk); |
| unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk); |
| |
| /* called under PM lock */ |
| static inline void __mptcp_pm_close_subflow(struct mptcp_sock *msk) |
| { |
| if (--msk->pm.subflows < mptcp_pm_get_subflows_max(msk)) |
| WRITE_ONCE(msk->pm.accept_subflow, true); |
| } |
| |
| static inline void mptcp_pm_close_subflow(struct mptcp_sock *msk) |
| { |
| spin_lock_bh(&msk->pm.lock); |
| __mptcp_pm_close_subflow(msk); |
| spin_unlock_bh(&msk->pm.lock); |
| } |
| |
| void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk); |
| void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk); |
| |
| static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) |
| { |
| return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); |
| } |
| |
| void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); |
| |
| static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) |
| { |
| return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); |
| } |
| |
| static inline bool mptcp_check_fallback(const struct sock *sk) |
| { |
| struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); |
| struct mptcp_sock *msk = mptcp_sk(subflow->conn); |
| |
| return __mptcp_check_fallback(msk); |
| } |
| |
| static inline void __mptcp_do_fallback(struct mptcp_sock *msk) |
| { |
| if (__mptcp_check_fallback(msk)) { |
| pr_debug("TCP fallback already done (msk=%p)", msk); |
| return; |
| } |
| set_bit(MPTCP_FALLBACK_DONE, &msk->flags); |
| } |
| |
| static inline bool __mptcp_has_initial_subflow(const struct mptcp_sock *msk) |
| { |
| struct sock *ssk = READ_ONCE(msk->first); |
| |
| return ssk && ((1 << inet_sk_state_load(ssk)) & |
| (TCPF_ESTABLISHED | TCPF_SYN_SENT | |
| TCPF_SYN_RECV | TCPF_LISTEN)); |
| } |
| |
| static inline void mptcp_do_fallback(struct sock *ssk) |
| { |
| struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); |
| struct sock *sk = subflow->conn; |
| struct mptcp_sock *msk; |
| |
| msk = mptcp_sk(sk); |
| __mptcp_do_fallback(msk); |
| if (READ_ONCE(msk->snd_data_fin_enable) && !(ssk->sk_shutdown & SEND_SHUTDOWN)) { |
| gfp_t saved_allocation = ssk->sk_allocation; |
| |
| /* we are in a atomic (BH) scope, override ssk default for data |
| * fin allocation |
| */ |
| ssk->sk_allocation = GFP_ATOMIC; |
| ssk->sk_shutdown |= SEND_SHUTDOWN; |
| tcp_shutdown(ssk, SEND_SHUTDOWN); |
| ssk->sk_allocation = saved_allocation; |
| } |
| } |
| |
| #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) |
| |
| static inline bool mptcp_check_infinite_map(struct sk_buff *skb) |
| { |
| struct mptcp_ext *mpext; |
| |
| mpext = skb ? mptcp_get_ext(skb) : NULL; |
| if (mpext && mpext->infinite_map) |
| return true; |
| |
| return false; |
| } |
| |
| static inline bool is_active_ssk(struct mptcp_subflow_context *subflow) |
| { |
| return (subflow->request_mptcp || subflow->request_join); |
| } |
| |
| static inline bool subflow_simultaneous_connect(struct sock *sk) |
| { |
| struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); |
| |
| return (1 << sk->sk_state) & |
| (TCPF_ESTABLISHED | TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 | TCPF_CLOSING) && |
| is_active_ssk(subflow) && |
| !subflow->conn_finished; |
| } |
| |
| #ifdef CONFIG_SYN_COOKIES |
| void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, |
| struct sk_buff *skb); |
| bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, |
| struct sk_buff *skb); |
| void __init mptcp_join_cookie_init(void); |
| #else |
| static inline void |
| subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, |
| struct sk_buff *skb) {} |
| static inline bool |
| mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, |
| struct sk_buff *skb) |
| { |
| return false; |
| } |
| |
| static inline void mptcp_join_cookie_init(void) {} |
| #endif |
| |
| #endif /* __MPTCP_PROTOCOL_H */ |