bsd/netinet/mp_pcb.h

   1 /*
   2  * Copyright (c) 2012-2017 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #ifndef _NETINET_MP_PCB_H_
  30 #define _NETINET_MP_PCB_H_
  31
  32 #ifdef BSD_KERNEL_PRIVATE
  33 #include <sys/domain.h>
  34 #include <sys/protosw.h>
  35 #include <sys/socketvar.h>
  36 #include <sys/types.h>
  37 #include <sys/queue.h>
  38 #include <kern/locks.h>
  39
  40 /* Keep in sync with bsd/dev/dtrace/scripts/mptcp.d */
  41 typedef enum mppcb_state {
  42         MPPCB_STATE_INUSE       = 1,
  43         MPPCB_STATE_DEAD        = 2,
  44 } mppcb_state_t;
  45
  46 /*
  47  * Multipath Protocol Control Block
  48  */
  49 struct mppcb {
  50         TAILQ_ENTRY(mppcb)      mpp_entry;      /* glue to all PCBs */
  51         decl_lck_mtx_data(, mpp_lock);          /* per PCB lock */
  52         struct mppcbinfo        *mpp_pcbinfo;   /* PCB info */
  53         struct mptses           *mpp_pcbe;      /* ptr to MPTCP-session */
  54         struct socket           *mpp_socket;    /* back pointer to socket */
  55         uint32_t                mpp_flags;      /* PCB flags */
  56         mppcb_state_t           mpp_state;      /* PCB state */
  57         int32_t                 mpp_inside;     /* Indicates whether or not a thread is processing MPTCP */
  58
  59 #if NECP
  60         uuid_t necp_client_uuid;
  61         void (*necp_cb)(void *, int, uint32_t, uint32_t, bool *);
  62 #endif
  63 };
  64
  65 static inline struct mppcb *
  66 mpsotomppcb(struct socket *mp_so)
  67 {
  68         VERIFY(SOCK_DOM(mp_so) == PF_MULTIPATH);
  69         return (struct mppcb *)mp_so->so_pcb;
  70 }
  71
  72 /* valid values for mpp_flags */
  73 #define MPP_ATTACHED            0x001
  74 #define MPP_INSIDE_OUTPUT       0x002           /* MPTCP-stack is inside mptcp_subflow_output */
  75 #define MPP_INSIDE_INPUT        0x004           /* MPTCP-stack is inside mptcp_subflow_input */
  76 #define MPP_INPUT_HANDLE        0x008           /* MPTCP-stack is handling input */
  77 #define MPP_WUPCALL             0x010           /* MPTCP-stack is handling a read upcall */
  78 #define MPP_SHOULD_WORKLOOP     0x020           /* MPTCP-stack should call the workloop function */
  79 #define MPP_SHOULD_RWAKEUP      0x040           /* MPTCP-stack should call sorwakeup */
  80 #define MPP_SHOULD_WWAKEUP      0x080           /* MPTCP-stack should call sowwakeup */
  81 #define MPP_CREATE_SUBFLOWS     0x100           /* This connection needs to create subflows */
  82
  83 static inline boolean_t
  84 mptcp_should_defer_upcall(struct mppcb *mpp)
  85 {
  86         return !!(mpp->mpp_flags & (MPP_INSIDE_OUTPUT | MPP_INSIDE_INPUT | MPP_INPUT_HANDLE | MPP_WUPCALL));
  87 }
  88
  89 /*
  90  * Multipath PCB Information
  91  */
  92 struct mppcbinfo {
  93         TAILQ_ENTRY(mppcbinfo)  mppi_entry;     /* glue to all PCB info */
  94         TAILQ_HEAD(, mppcb)     mppi_pcbs;      /* list of PCBs */
  95         uint32_t                mppi_count;     /* # of PCBs in list */
  96         struct zone             *mppi_zone;     /* zone for this PCB */
  97         uint32_t                mppi_size;      /* size of PCB structure */
  98         lck_grp_t               *mppi_lock_grp; /* lock grp */
  99         lck_attr_t              *mppi_lock_attr; /* lock attr */
 100         lck_grp_attr_t          *mppi_lock_grp_attr; /* lock grp attr */
 101         decl_lck_mtx_data(, mppi_lock);         /* global PCB lock */
 102         uint32_t (*mppi_gc)(struct mppcbinfo *); /* garbage collector func */
 103         uint32_t (*mppi_timer)(struct mppcbinfo *); /* timer func */
 104 };
 105
 106 __BEGIN_DECLS
 107 extern void mp_pcbinit(void);
 108 extern void mp_pcbinfo_attach(struct mppcbinfo *);
 109 extern int mp_pcbinfo_detach(struct mppcbinfo *);
 110 extern int mp_pcballoc(struct socket *, struct mppcbinfo *);
 111 extern void mp_pcbdetach(struct socket *);
 112 extern void mp_pcbdispose(struct mppcb *);
 113 extern void mp_gc_sched(void);
 114 extern void mptcp_timer_sched(void);
 115 extern void mptcp_handle_deferred_upcalls(struct mppcb *mpp, uint32_t flag);
 116 extern int mp_getsockaddr(struct socket *mp_so, struct sockaddr **nam);
 117 extern int mp_getpeeraddr(struct socket *mp_so, struct sockaddr **nam);
 118 #if NECP
 119 extern int necp_client_register_multipath_cb(pid_t pid, uuid_t client_id, struct mppcb *mpp);
 120 extern void necp_mppcb_dispose(struct mppcb *mpp);
 121 #endif
 122 __END_DECLS
 123
 124 #endif /* BSD_KERNEL_PRIVATE */
 125 #endif /* !_NETINET_MP_PCB_H_ */