[e599318] | 1 | /*- |
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| 2 | * Copyright (c) 1982, 1986, 1990, 1993 |
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| 3 | * The Regents of the University of California. All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * 1. Redistributions of source code must retain the above copyright |
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| 9 | * notice, this list of conditions and the following disclaimer. |
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer in the |
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| 12 | * documentation and/or other materials provided with the distribution. |
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[de8a76d] | 13 | * 3. Neither the name of the University nor the names of its contributors |
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[e599318] | 14 | * may be used to endorse or promote products derived from this software |
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| 15 | * without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 27 | * SUCH DAMAGE. |
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| 28 | * |
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| 29 | * @(#)socketvar.h 8.3 (Berkeley) 2/19/95 |
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| 30 | * |
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| 31 | * $FreeBSD$ |
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| 32 | */ |
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| 33 | |
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| 34 | #ifndef _SYS_SOCKETVAR_H_ |
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| 35 | #define _SYS_SOCKETVAR_H_ |
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| 36 | |
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| 37 | #include <sys/queue.h> /* for TAILQ macros */ |
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| 38 | #include <sys/selinfo.h> /* for struct selinfo */ |
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| 39 | #include <sys/_lock.h> |
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| 40 | #include <sys/_mutex.h> |
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[c40e45b] | 41 | #include <sys/osd.h> |
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[e599318] | 42 | #include <sys/_sx.h> |
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| 43 | #include <sys/sockbuf.h> |
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| 44 | #include <sys/sockstate.h> |
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| 45 | #ifdef _KERNEL |
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[c40e45b] | 46 | #include <sys/caprights.h> |
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[e599318] | 47 | #include <sys/sockopt.h> |
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| 48 | #endif |
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| 49 | |
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| 50 | struct vnet; |
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| 51 | |
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| 52 | /* |
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| 53 | * Kernel structure per socket. |
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| 54 | * Contains send and receive buffer queues, |
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| 55 | * handle on protocol and pointer to protocol |
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| 56 | * private data and error information. |
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| 57 | */ |
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| 58 | typedef u_quad_t so_gen_t; |
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| 59 | |
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| 60 | struct socket; |
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| 61 | |
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| 62 | /*- |
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| 63 | * Locking key to struct socket: |
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| 64 | * (a) constant after allocation, no locking required. |
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| 65 | * (b) locked by SOCK_LOCK(so). |
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| 66 | * (c) locked by SOCKBUF_LOCK(&so->so_rcv). |
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| 67 | * (e) locked by ACCEPT_LOCK(). |
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| 68 | * (f) not locked since integer reads/writes are atomic. |
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| 69 | * (g) used only as a sleep/wakeup address, no value. |
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| 70 | * (h) locked by global mutex so_global_mtx. |
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| 71 | */ |
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| 72 | struct socket { |
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| 73 | int so_count; /* (b) reference count */ |
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| 74 | short so_type; /* (a) generic type, see socket.h */ |
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| 75 | short so_options; /* from socket call, see socket.h */ |
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| 76 | short so_linger; /* time to linger while closing */ |
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| 77 | short so_state; /* (b) internal state flags SS_* */ |
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| 78 | int so_qstate; /* (e) internal state flags SQ_* */ |
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| 79 | void *so_pcb; /* protocol control block */ |
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[c40e45b] | 80 | struct vnet *so_vnet; /* (a) network stack instance */ |
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[e599318] | 81 | struct protosw *so_proto; /* (a) protocol handle */ |
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| 82 | /* |
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| 83 | * Variables for connection queuing. |
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| 84 | * Socket where accepts occur is so_head in all subsidiary sockets. |
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| 85 | * If so_head is 0, socket is not related to an accept. |
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| 86 | * For head socket so_incomp queues partially completed connections, |
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| 87 | * while so_comp is a queue of connections ready to be accepted. |
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| 88 | * If a connection is aborted and it has so_head set, then |
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| 89 | * it has to be pulled out of either so_incomp or so_comp. |
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| 90 | * We allow connections to queue up based on current queue lengths |
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| 91 | * and limit on number of queued connections for this socket. |
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| 92 | */ |
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| 93 | struct socket *so_head; /* (e) back pointer to listen socket */ |
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| 94 | TAILQ_HEAD(, socket) so_incomp; /* (e) queue of partial unaccepted connections */ |
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| 95 | TAILQ_HEAD(, socket) so_comp; /* (e) queue of complete unaccepted connections */ |
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| 96 | TAILQ_ENTRY(socket) so_list; /* (e) list of unaccepted connections */ |
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[c40e45b] | 97 | u_int so_qlen; /* (e) number of unaccepted connections */ |
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| 98 | u_int so_incqlen; /* (e) number of unaccepted incomplete |
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[e599318] | 99 | connections */ |
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[c40e45b] | 100 | u_int so_qlimit; /* (e) max number queued connections */ |
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[e599318] | 101 | short so_timeo; /* (g) connection timeout */ |
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| 102 | u_short so_error; /* (f) error affecting connection */ |
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| 103 | struct sigio *so_sigio; /* [sg] information for async I/O or |
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| 104 | out of band data (SIGURG) */ |
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| 105 | u_long so_oobmark; /* (c) chars to oob mark */ |
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| 106 | |
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| 107 | struct sockbuf so_rcv, so_snd; |
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| 108 | |
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| 109 | struct ucred *so_cred; /* (a) user credentials */ |
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| 110 | struct label *so_label; /* (b) MAC label for socket */ |
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| 111 | struct label *so_peerlabel; /* (b) cached MAC label for peer */ |
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| 112 | /* NB: generation count must not be first. */ |
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| 113 | so_gen_t so_gencnt; /* (h) generation count */ |
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| 114 | void *so_emuldata; /* (b) private data for emulators */ |
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| 115 | struct so_accf { |
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| 116 | struct accept_filter *so_accept_filter; |
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| 117 | void *so_accept_filter_arg; /* saved filter args */ |
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| 118 | char *so_accept_filter_str; /* saved user args */ |
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| 119 | } *so_accf; |
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[c40e45b] | 120 | struct osd osd; /* Object Specific extensions */ |
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[66659ff] | 121 | /* |
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| 122 | * so_fibnum, so_user_cookie and friends can be used to attach |
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| 123 | * some user-specified metadata to a socket, which then can be |
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| 124 | * used by the kernel for various actions. |
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| 125 | * so_user_cookie is used by ipfw/dummynet. |
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| 126 | */ |
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[e599318] | 127 | int so_fibnum; /* routing domain for this socket */ |
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[66659ff] | 128 | uint32_t so_user_cookie; |
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[c40e45b] | 129 | |
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[de8a76d] | 130 | int so_ts_clock; /* type of the clock used for timestamps */ |
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| 131 | uint32_t so_max_pacing_rate; /* (f) TX rate limit in bytes/s */ |
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| 132 | |
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| 133 | void *so_pspare[2]; /* general use */ |
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| 134 | int so_ispare[2]; /* general use */ |
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[e599318] | 135 | }; |
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| 136 | |
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| 137 | /* |
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| 138 | * Global accept mutex to serialize access to accept queues and |
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| 139 | * fields associated with multiple sockets. This allows us to |
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| 140 | * avoid defining a lock order between listen and accept sockets |
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| 141 | * until such time as it proves to be a good idea. |
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| 142 | */ |
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| 143 | extern struct mtx accept_mtx; |
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| 144 | #define ACCEPT_LOCK_ASSERT() mtx_assert(&accept_mtx, MA_OWNED) |
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| 145 | #define ACCEPT_UNLOCK_ASSERT() mtx_assert(&accept_mtx, MA_NOTOWNED) |
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| 146 | #define ACCEPT_LOCK() mtx_lock(&accept_mtx) |
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| 147 | #define ACCEPT_UNLOCK() mtx_unlock(&accept_mtx) |
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| 148 | |
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| 149 | /* |
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| 150 | * Per-socket mutex: we reuse the receive socket buffer mutex for space |
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| 151 | * efficiency. This decision should probably be revisited as we optimize |
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| 152 | * locking for the socket code. |
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| 153 | */ |
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| 154 | #define SOCK_MTX(_so) SOCKBUF_MTX(&(_so)->so_rcv) |
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| 155 | #define SOCK_LOCK(_so) SOCKBUF_LOCK(&(_so)->so_rcv) |
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| 156 | #define SOCK_OWNED(_so) SOCKBUF_OWNED(&(_so)->so_rcv) |
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| 157 | #define SOCK_UNLOCK(_so) SOCKBUF_UNLOCK(&(_so)->so_rcv) |
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| 158 | #define SOCK_LOCK_ASSERT(_so) SOCKBUF_LOCK_ASSERT(&(_so)->so_rcv) |
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| 159 | |
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| 160 | /* |
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| 161 | * Socket state bits stored in so_qstate. |
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| 162 | */ |
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| 163 | #define SQ_INCOMP 0x0800 /* unaccepted, incomplete connection */ |
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| 164 | #define SQ_COMP 0x1000 /* unaccepted, complete connection */ |
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| 165 | |
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| 166 | /* |
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| 167 | * Externalized form of struct socket used by the sysctl(3) interface. |
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| 168 | */ |
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| 169 | struct xsocket { |
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| 170 | size_t xso_len; /* length of this structure */ |
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| 171 | struct socket *xso_so; /* makes a convenient handle sometimes */ |
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| 172 | short so_type; |
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| 173 | short so_options; |
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| 174 | short so_linger; |
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| 175 | short so_state; |
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| 176 | caddr_t so_pcb; /* another convenient handle */ |
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| 177 | int xso_protocol; |
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| 178 | int xso_family; |
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[c40e45b] | 179 | u_int so_qlen; |
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| 180 | u_int so_incqlen; |
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| 181 | u_int so_qlimit; |
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[e599318] | 182 | short so_timeo; |
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| 183 | u_short so_error; |
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| 184 | pid_t so_pgid; |
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| 185 | u_long so_oobmark; |
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| 186 | struct xsockbuf so_rcv, so_snd; |
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| 187 | uid_t so_uid; /* XXX */ |
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| 188 | }; |
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| 189 | |
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| 190 | #ifdef _KERNEL |
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| 191 | |
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| 192 | /* |
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| 193 | * Macros for sockets and socket buffering. |
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| 194 | */ |
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| 195 | |
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| 196 | /* |
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| 197 | * Flags to sblock(). |
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| 198 | */ |
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| 199 | #define SBL_WAIT 0x00000001 /* Wait if not immediately available. */ |
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| 200 | #define SBL_NOINTR 0x00000002 /* Force non-interruptible sleep. */ |
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| 201 | #define SBL_VALID (SBL_WAIT | SBL_NOINTR) |
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| 202 | |
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| 203 | /* |
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| 204 | * Do we need to notify the other side when I/O is possible? |
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| 205 | */ |
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| 206 | #define sb_notify(sb) (((sb)->sb_flags & (SB_WAIT | SB_SEL | SB_ASYNC | \ |
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| 207 | SB_UPCALL | SB_AIO | SB_KNOTE)) != 0) |
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| 208 | |
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| 209 | /* do we have to send all at once on a socket? */ |
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| 210 | #define sosendallatonce(so) \ |
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| 211 | ((so)->so_proto->pr_flags & PR_ATOMIC) |
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| 212 | |
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| 213 | /* can we read something from so? */ |
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| 214 | #define soreadabledata(so) \ |
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[c40e45b] | 215 | (sbavail(&(so)->so_rcv) >= (so)->so_rcv.sb_lowat || \ |
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[e599318] | 216 | !TAILQ_EMPTY(&(so)->so_comp) || (so)->so_error) |
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| 217 | #define soreadable(so) \ |
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| 218 | (soreadabledata(so) || ((so)->so_rcv.sb_state & SBS_CANTRCVMORE)) |
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| 219 | |
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| 220 | /* can we write something to so? */ |
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| 221 | #define sowriteable(so) \ |
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| 222 | ((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \ |
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| 223 | (((so)->so_state&SS_ISCONNECTED) || \ |
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| 224 | ((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \ |
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| 225 | ((so)->so_snd.sb_state & SBS_CANTSENDMORE) || \ |
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| 226 | (so)->so_error) |
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| 227 | |
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| 228 | /* |
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| 229 | * soref()/sorele() ref-count the socket structure. Note that you must |
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| 230 | * still explicitly close the socket, but the last ref count will free |
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| 231 | * the structure. |
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| 232 | */ |
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| 233 | #define soref(so) do { \ |
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| 234 | SOCK_LOCK_ASSERT(so); \ |
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| 235 | ++(so)->so_count; \ |
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| 236 | } while (0) |
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| 237 | |
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| 238 | #define sorele(so) do { \ |
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| 239 | ACCEPT_LOCK_ASSERT(); \ |
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| 240 | SOCK_LOCK_ASSERT(so); \ |
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| 241 | if ((so)->so_count <= 0) \ |
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| 242 | panic("sorele"); \ |
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| 243 | if (--(so)->so_count == 0) \ |
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| 244 | sofree(so); \ |
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| 245 | else { \ |
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| 246 | SOCK_UNLOCK(so); \ |
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| 247 | ACCEPT_UNLOCK(); \ |
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| 248 | } \ |
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| 249 | } while (0) |
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| 250 | |
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| 251 | /* |
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| 252 | * In sorwakeup() and sowwakeup(), acquire the socket buffer lock to |
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| 253 | * avoid a non-atomic test-and-wakeup. However, sowakeup is |
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| 254 | * responsible for releasing the lock if it is called. We unlock only |
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| 255 | * if we don't call into sowakeup. If any code is introduced that |
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| 256 | * directly invokes the underlying sowakeup() primitives, it must |
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| 257 | * maintain the same semantics. |
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| 258 | */ |
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| 259 | #define sorwakeup_locked(so) do { \ |
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| 260 | SOCKBUF_LOCK_ASSERT(&(so)->so_rcv); \ |
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| 261 | if (sb_notify(&(so)->so_rcv)) \ |
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| 262 | sowakeup((so), &(so)->so_rcv); \ |
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| 263 | else \ |
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| 264 | SOCKBUF_UNLOCK(&(so)->so_rcv); \ |
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| 265 | } while (0) |
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| 266 | |
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| 267 | #define sorwakeup(so) do { \ |
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| 268 | SOCKBUF_LOCK(&(so)->so_rcv); \ |
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| 269 | sorwakeup_locked(so); \ |
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| 270 | } while (0) |
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| 271 | |
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| 272 | #define sowwakeup_locked(so) do { \ |
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| 273 | SOCKBUF_LOCK_ASSERT(&(so)->so_snd); \ |
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| 274 | if (sb_notify(&(so)->so_snd)) \ |
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| 275 | sowakeup((so), &(so)->so_snd); \ |
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| 276 | else \ |
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| 277 | SOCKBUF_UNLOCK(&(so)->so_snd); \ |
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| 278 | } while (0) |
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| 279 | |
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| 280 | #define sowwakeup(so) do { \ |
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| 281 | SOCKBUF_LOCK(&(so)->so_snd); \ |
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| 282 | sowwakeup_locked(so); \ |
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| 283 | } while (0) |
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| 284 | |
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| 285 | struct accept_filter { |
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| 286 | char accf_name[16]; |
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| 287 | int (*accf_callback) |
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| 288 | (struct socket *so, void *arg, int waitflag); |
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| 289 | void * (*accf_create) |
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| 290 | (struct socket *so, char *arg); |
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| 291 | void (*accf_destroy) |
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| 292 | (struct socket *so); |
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| 293 | SLIST_ENTRY(accept_filter) accf_next; |
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| 294 | }; |
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| 295 | |
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| 296 | #ifdef MALLOC_DECLARE |
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| 297 | MALLOC_DECLARE(M_ACCF); |
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| 298 | MALLOC_DECLARE(M_PCB); |
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| 299 | MALLOC_DECLARE(M_SONAME); |
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| 300 | #endif |
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| 301 | |
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[c40e45b] | 302 | /* |
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| 303 | * Socket specific helper hook point identifiers |
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| 304 | * Do not leave holes in the sequence, hook registration is a loop. |
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| 305 | */ |
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| 306 | #define HHOOK_SOCKET_OPT 0 |
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| 307 | #define HHOOK_SOCKET_CREATE 1 |
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| 308 | #define HHOOK_SOCKET_RCV 2 |
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| 309 | #define HHOOK_SOCKET_SND 3 |
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| 310 | #define HHOOK_FILT_SOREAD 4 |
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| 311 | #define HHOOK_FILT_SOWRITE 5 |
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| 312 | #define HHOOK_SOCKET_CLOSE 6 |
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| 313 | #define HHOOK_SOCKET_LAST HHOOK_SOCKET_CLOSE |
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| 314 | |
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| 315 | struct socket_hhook_data { |
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| 316 | struct socket *so; |
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| 317 | struct mbuf *m; |
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| 318 | void *hctx; /* hook point specific data*/ |
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| 319 | int status; |
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| 320 | }; |
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| 321 | |
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[e599318] | 322 | extern int maxsockets; |
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| 323 | extern u_long sb_max; |
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| 324 | extern so_gen_t so_gencnt; |
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| 325 | |
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[c40e45b] | 326 | struct file; |
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[75b706f] | 327 | struct filecaps; |
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[c40e45b] | 328 | struct filedesc; |
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[e599318] | 329 | struct mbuf; |
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| 330 | struct sockaddr; |
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| 331 | struct ucred; |
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| 332 | struct uio; |
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| 333 | |
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| 334 | /* 'which' values for socket upcalls. */ |
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| 335 | #define SO_RCV 1 |
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| 336 | #define SO_SND 2 |
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| 337 | |
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| 338 | /* Return values for socket upcalls. */ |
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| 339 | #define SU_OK 0 |
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| 340 | #define SU_ISCONNECTED 1 |
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| 341 | |
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| 342 | /* |
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| 343 | * From uipc_socket and friends |
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| 344 | */ |
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[94b5368] | 345 | #ifndef __rtems__ |
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[e599318] | 346 | int getsockaddr(struct sockaddr **namp, caddr_t uaddr, size_t len); |
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[94b5368] | 347 | #endif /* __rtems__ */ |
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[c40e45b] | 348 | int getsock_cap(struct thread *td, int fd, cap_rights_t *rightsp, |
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[75b706f] | 349 | struct file **fpp, u_int *fflagp, struct filecaps *havecaps); |
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[e599318] | 350 | void soabort(struct socket *so); |
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| 351 | int soaccept(struct socket *so, struct sockaddr **nam); |
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[c40e45b] | 352 | void soaio_enqueue(struct task *task); |
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| 353 | void soaio_rcv(void *context, int pending); |
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| 354 | void soaio_snd(void *context, int pending); |
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[e599318] | 355 | int socheckuid(struct socket *so, uid_t uid); |
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| 356 | int sobind(struct socket *so, struct sockaddr *nam, struct thread *td); |
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[c40e45b] | 357 | int sobindat(int fd, struct socket *so, struct sockaddr *nam, |
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| 358 | struct thread *td); |
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[e599318] | 359 | int soclose(struct socket *so); |
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| 360 | int soconnect(struct socket *so, struct sockaddr *nam, struct thread *td); |
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[c40e45b] | 361 | int soconnectat(int fd, struct socket *so, struct sockaddr *nam, |
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| 362 | struct thread *td); |
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[e599318] | 363 | int soconnect2(struct socket *so1, struct socket *so2); |
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| 364 | int socreate(int dom, struct socket **aso, int type, int proto, |
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| 365 | struct ucred *cred, struct thread *td); |
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| 366 | int sodisconnect(struct socket *so); |
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| 367 | struct sockaddr *sodupsockaddr(const struct sockaddr *sa, int mflags); |
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| 368 | void sofree(struct socket *so); |
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| 369 | void sohasoutofband(struct socket *so); |
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| 370 | int solisten(struct socket *so, int backlog, struct thread *td); |
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| 371 | void solisten_proto(struct socket *so, int backlog); |
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| 372 | int solisten_proto_check(struct socket *so); |
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| 373 | struct socket * |
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| 374 | sonewconn(struct socket *head, int connstatus); |
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| 375 | |
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| 376 | |
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| 377 | int sopoll(struct socket *so, int events, struct ucred *active_cred, |
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| 378 | struct thread *td); |
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| 379 | int sopoll_generic(struct socket *so, int events, |
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| 380 | struct ucred *active_cred, struct thread *td); |
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| 381 | int soreceive(struct socket *so, struct sockaddr **paddr, struct uio *uio, |
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| 382 | struct mbuf **mp0, struct mbuf **controlp, int *flagsp); |
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| 383 | int soreceive_stream(struct socket *so, struct sockaddr **paddr, |
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| 384 | struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, |
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| 385 | int *flagsp); |
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| 386 | int soreceive_dgram(struct socket *so, struct sockaddr **paddr, |
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| 387 | struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, |
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| 388 | int *flagsp); |
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| 389 | int soreceive_generic(struct socket *so, struct sockaddr **paddr, |
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| 390 | struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, |
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| 391 | int *flagsp); |
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| 392 | int soreserve(struct socket *so, u_long sndcc, u_long rcvcc); |
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| 393 | void sorflush(struct socket *so); |
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| 394 | int sosend(struct socket *so, struct sockaddr *addr, struct uio *uio, |
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| 395 | struct mbuf *top, struct mbuf *control, int flags, |
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| 396 | struct thread *td); |
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| 397 | int sosend_dgram(struct socket *so, struct sockaddr *addr, |
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| 398 | struct uio *uio, struct mbuf *top, struct mbuf *control, |
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| 399 | int flags, struct thread *td); |
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| 400 | int sosend_generic(struct socket *so, struct sockaddr *addr, |
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| 401 | struct uio *uio, struct mbuf *top, struct mbuf *control, |
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| 402 | int flags, struct thread *td); |
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| 403 | int soshutdown(struct socket *so, int how); |
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| 404 | void sotoxsocket(struct socket *so, struct xsocket *xso); |
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| 405 | void soupcall_clear(struct socket *so, int which); |
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| 406 | void soupcall_set(struct socket *so, int which, |
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| 407 | int (*func)(struct socket *, void *, int), void *arg); |
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| 408 | void sowakeup(struct socket *so, struct sockbuf *sb); |
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[c40e45b] | 409 | #ifndef __rtems__ |
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| 410 | void sowakeup_aio(struct socket *so, struct sockbuf *sb); |
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| 411 | #else /* __rtems__ */ |
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| 412 | #define sowakeup_aio(so, sb) (void)0 |
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| 413 | #endif /* __rtems__ */ |
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[e599318] | 414 | int selsocket(struct socket *so, int events, struct timeval *tv, |
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| 415 | struct thread *td); |
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| 416 | |
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| 417 | /* |
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| 418 | * Accept filter functions (duh). |
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| 419 | */ |
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| 420 | int accept_filt_add(struct accept_filter *filt); |
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| 421 | int accept_filt_del(char *name); |
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| 422 | struct accept_filter *accept_filt_get(char *name); |
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| 423 | #ifdef ACCEPT_FILTER_MOD |
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| 424 | #ifdef SYSCTL_DECL |
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| 425 | SYSCTL_DECL(_net_inet_accf); |
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| 426 | #endif |
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| 427 | int accept_filt_generic_mod_event(module_t mod, int event, void *data); |
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| 428 | #endif |
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| 429 | |
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| 430 | #endif /* _KERNEL */ |
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| 431 | |
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| 432 | #endif /* !_SYS_SOCKETVAR_H_ */ |
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