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-rw-r--r--net/mptcp/protocol.h1038
1 files changed, 1038 insertions, 0 deletions
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
new file mode 100644
index 000000000..4ec8e0a81
--- /dev/null
+++ b/net/mptcp/protocol.h
@@ -0,0 +1,1038 @@
+/* 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>
+
+#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_WORK_EOF 3
+#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_CONNECTED 6
+#define MPTCP_RESET_SCHEDULER 7
+
+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;
+ u64 remote_key;
+ u64 write_seq;
+ u64 snd_nxt;
+ u64 ack_seq;
+ atomic64_t rcv_wnd_sent;
+ u64 rcv_data_fin_seq;
+ int rmem_fwd_alloc;
+ struct sock *last_snd;
+ 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 snd_una;
+ u64 wnd_end;
+ unsigned long timer_ival;
+ u32 token;
+ int rmem_released;
+ unsigned long flags;
+ unsigned long cb_flags;
+ unsigned long push_pending;
+ 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 mpc_endpoint_id;
+ u8 recvmsg_inq:1,
+ cork:1,
+ nodelay:1,
+ fastopening:1,
+ in_accept_queue: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 socket *subflow; /* outgoing connect/listener/!mp_capable
+ * The mptcp ops can safely dereference, using suitable
+ * ONCE annotation, the subflow outside the socket
+ * lock as such sock is freed after close().
+ */
+ struct sock *first;
+ struct mptcp_pm_data pm;
+ 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;
+
+ 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);
+}
+
+static inline struct mptcp_sock *mptcp_sk(const struct sock *sk)
+{
+ return (struct mptcp_sock *)sk;
+}
+
+/* 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_space(const struct sock *sk)
+{
+ return tcp_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)
+{
+ 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(const struct sock *sk)
+{
+ struct mptcp_sock *msk = mptcp_sk(sk);
+
+ if (msk->snd_una == READ_ONCE(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;
+}
+
+enum mptcp_data_avail {
+ MPTCP_SUBFLOW_NODATA,
+ MPTCP_SUBFLOW_DATA_AVAIL,
+};
+
+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_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,
+ rx_eof : 1,
+ can_ack : 1, /* only after processing the remote a key */
+ disposable : 1, /* ctx can be free at ulp release time */
+ stale : 1, /* unable to snd/rcv data, do not use for xmit */
+ local_id_valid : 1, /* local_id is correctly initialized */
+ valid_csum_seen : 1; /* at least one csum validated */
+ enum mptcp_data_avail data_avail;
+ u32 remote_nonce;
+ u64 thmac;
+ u32 local_nonce;
+ u32 remote_token;
+ u8 hmac[MPTCPOPT_HMAC_LEN];
+ u8 local_id;
+ u8 remote_id;
+ u8 reset_seen:1;
+ u8 reset_transient:1;
+ u8 reset_reason:4;
+ u8 stale_count;
+
+ 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;
+
+ 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;
+}
+
+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);
+int mptcp_get_pm_type(const struct net *net);
+void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
+ 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 socket *__mptcp_nmpc_socket(const 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);
+
+bool mptcp_addresses_equal(const struct mptcp_addr_info *a,
+ const struct mptcp_addr_info *b, bool use_port);
+
+/* 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);
+
+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_set_connected(struct sock *sk);
+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);
+void mptcp_subflow_eof(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 bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
+{
+ if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf))
+ return false;
+
+ WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf);
+ return true;
+}
+
+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 *sk);
+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, gfp_t gfp);
+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 sock *ssk,
+ 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_pm_addr_entry *entry);
+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_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
+ unsigned int id,
+ u8 *flags, int *ifindex);
+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);
+
+int mptcp_userspace_pm_append_new_local_addr(struct mptcp_sock *msk,
+ struct mptcp_pm_addr_entry *entry);
+void mptcp_free_local_addr_list(struct mptcp_sock *msk);
+int mptcp_nl_cmd_announce(struct sk_buff *skb, struct genl_info *info);
+int mptcp_nl_cmd_remove(struct sk_buff *skb, struct genl_info *info);
+int mptcp_nl_cmd_sf_create(struct sk_buff *skb, struct genl_info *info);
+int mptcp_nl_cmd_sf_destroy(struct sk_buff *skb, struct genl_info *info);
+
+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);
+bool mptcp_userspace_pm_active(const struct mptcp_sock *msk);
+
+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_userspace_pm_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc);
+
+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);
+int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
+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 (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) {
+ pr_debug("TCP fallback already done (msk=%p)", msk);
+ return;
+ }
+ set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
+}
+
+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 sk->sk_state == TCP_ESTABLISHED &&
+ 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 */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-08 22:06:43 +0000