/* 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 <net/rstreason.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_WORK_RTX 1
#define MPTCP_FALLBACK_DONE 2
#define MPTCP_WORK_CLOSE_SUBFLOW 3
/* 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_local {
struct mptcp_addr_info addr;
u8 flags;
int ifindex;
};
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;
u32 last_data_sent;
u32 last_data_recv;
u32 last_ack_recv;
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;
u32 notsent_lowat;
int keepalive_cnt;
int keepalive_idle;
int keepalive_intvl;
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)
extern struct genl_family mptcp_genl_family;
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_from_win(const struct sock *sk, int win)
{
return __tcp_space_from_win(mptcp_sk(sk)->scaling_ratio, win);
}
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,
request_bkup : 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 */
close_event_done : 1, /* has done the post-closed part */
mpc_drop : 1, /* the MPC option has been dropped in a rtx */
__unused : 8;
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)
{
const 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);
}
/* Convert reset reasons in MPTCP to enum sk_rst_reason type */
static inline enum sk_rst_reason
sk_rst_convert_mptcp_reason(u32 reason)
{
switch (reason) {
case MPTCP_RST_EUNSPEC:
return SK_RST_REASON_MPTCP_RST_EUNSPEC;
case MPTCP_RST_EMPTCP:
return SK_RST_REASON_MPTCP_RST_EMPTCP;
case MPTCP_RST_ERESOURCE:
return SK_RST_REASON_MPTCP_RST_ERESOURCE;
case MPTCP_RST_EPROHIBIT:
return SK_RST_REASON_MPTCP_RST_EPROHIBIT;
case MPTCP_RST_EWQ2BIG:
return SK_RST_REASON_MPTCP_RST_EWQ2BIG;
case MPTCP_RST_EBADPERF:
return SK_RST_REASON_MPTCP_RST_EBADPERF;
case MPTCP_RST_EMIDDLEBOX:
return SK_RST_REASON_MPTCP_RST_EMIDDLEBOX;
default:
/* It should not happen, or else errors may occur
* in MPTCP layer
*/
return SK_RST_REASON_ERROR;
}
}
static inline void
mptcp_send_active_reset_reason(struct sock *sk)
{
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
enum sk_rst_reason reason;
reason = sk_rst_convert_mptcp_reason(subflow->reset_reason);
tcp_send_active_reset(sk, GFP_ATOMIC, reason);
}
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_active_disable(struct sock *sk);
bool mptcp_active_should_disable(struct sock *ssk);
void mptcp_active_enable(struct sock *sk);
void mptcp_get_available_schedulers(char *buf, size_t maxlen);
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_pm_local *local,
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 u32 mptcp_notsent_lowat(const struct sock *sk)
{
struct net *net = sock_net(sk);
u32 val;
val = READ_ONCE(mptcp_sk(sk)->notsent_lowat);
return val ?: READ_ONCE(net->ipv4.sysctl_tcp_notsent_lowat);
}
static inline bool mptcp_stream_memory_free(const struct sock *sk, int wake)
{
const struct mptcp_sock *msk = mptcp_sk(sk);
u32 notsent_bytes;
notsent_bytes = READ_ONCE(msk->write_seq) - READ_ONCE(msk->snd_nxt);
return (notsent_bytes << wake) < mptcp_notsent_lowat(sk);
}
static inline bool __mptcp_stream_is_writeable(const struct sock *sk, int wake)
{
return mptcp_stream_memory_free(sk, wake) &&
__sk_stream_is_writeable(sk, wake);
}
static inline void mptcp_write_space(struct sock *sk)
{
/* pairs with memory barrier in mptcp_poll */
smp_mb();
if (mptcp_stream_memory_free(sk, 1))
sk_stream_write_space(sk);
}
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 = READ_ONCE(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);
mptcp_write_space(sk);
}
/* 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();
}
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);
bool mptcp_pm_nl_is_init_remote_addr(struct mptcp_sock *msk,
const struct mptcp_addr_info *remote);
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_set_flags(struct sk_buff *skb, struct genl_info *info);
int mptcp_pm_nl_set_flags(struct sk_buff *skb, struct genl_info *info);
int mptcp_userspace_pm_set_flags(struct sk_buff *skb, struct genl_info *info);
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);
void mptcp_pm_remove_addrs(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);
int mptcp_nl_fill_addr(struct sk_buff *skb,
struct mptcp_pm_addr_entry *entry);
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);
bool mptcp_pm_is_backup(struct mptcp_sock *msk, struct sock_common *skc);
bool mptcp_pm_nl_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc);
bool mptcp_userspace_pm_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc);
int mptcp_pm_dump_addr(struct sk_buff *msg, struct netlink_callback *cb);
int mptcp_pm_nl_dump_addr(struct sk_buff *msg,
struct netlink_callback *cb);
int mptcp_userspace_pm_dump_addr(struct sk_buff *msg,
struct netlink_callback *cb);
int mptcp_pm_get_addr(struct sk_buff *skb, struct genl_info *info);
int mptcp_pm_nl_get_addr(struct sk_buff *skb, struct genl_info *info);
int mptcp_userspace_pm_get_addr(struct sk_buff *skb,
struct genl_info *info);
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);
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_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)\n", 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)\n", __func__, a)
static inline void mptcp_subflow_early_fallback(struct mptcp_sock *msk,
struct mptcp_subflow_context *subflow)
{
pr_fallback(msk);
subflow->request_mptcp = 0;
__mptcp_do_fallback(msk);
}
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 */
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