523 lines
18 KiB
C
523 lines
18 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1982, 1986, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)socketvar.h 8.3 (Berkeley) 2/19/95
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_SOCKETVAR_H_
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#define _SYS_SOCKETVAR_H_
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/*
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* Socket generation count type. Also used in xinpcb, xtcpcb, xunpcb.
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*/
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typedef uint64_t so_gen_t;
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#if defined(_KERNEL) || defined(_WANT_SOCKET)
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#include <sys/queue.h> /* for TAILQ macros */
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#include <sys/selinfo.h> /* for struct selinfo */
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#include <sys/_lock.h>
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#include <sys/_mutex.h>
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#include <sys/osd.h>
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#include <sys/_sx.h>
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#include <sys/sockbuf.h>
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#ifdef _KERNEL
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#include <sys/caprights.h>
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#include <sys/sockopt.h>
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#endif
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struct vnet;
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/*
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* Kernel structure per socket.
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* Contains send and receive buffer queues,
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* handle on protocol and pointer to protocol
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* private data and error information.
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*/
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typedef int so_upcall_t(struct socket *, void *, int);
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typedef void so_dtor_t(struct socket *);
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struct socket;
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/*-
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* Locking key to struct socket:
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* (a) constant after allocation, no locking required.
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* (b) locked by SOCK_LOCK(so).
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* (cr) locked by SOCKBUF_LOCK(&so->so_rcv).
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* (cs) locked by SOCKBUF_LOCK(&so->so_snd).
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* (e) locked by SOLISTEN_LOCK() of corresponding listening socket.
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* (f) not locked since integer reads/writes are atomic.
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* (g) used only as a sleep/wakeup address, no value.
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* (h) locked by global mutex so_global_mtx.
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*/
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TAILQ_HEAD(accept_queue, socket);
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struct socket {
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struct mtx so_lock;
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volatile u_int so_count; /* (b / refcount) */
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struct selinfo so_rdsel; /* (b/cr) for so_rcv/so_comp */
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struct selinfo so_wrsel; /* (b/cs) for so_snd */
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short so_type; /* (a) generic type, see socket.h */
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int so_options; /* (b) from socket call, see socket.h */
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short so_linger; /* time to linger close(2) */
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short so_state; /* (b) internal state flags SS_* */
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void *so_pcb; /* protocol control block */
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struct vnet *so_vnet; /* (a) network stack instance */
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struct protosw *so_proto; /* (a) protocol handle */
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short so_timeo; /* (g) connection timeout */
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u_short so_error; /* (f) error affecting connection */
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struct sigio *so_sigio; /* [sg] information for async I/O or
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out of band data (SIGURG) */
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struct ucred *so_cred; /* (a) user credentials */
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struct label *so_label; /* (b) MAC label for socket */
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/* NB: generation count must not be first. */
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so_gen_t so_gencnt; /* (h) generation count */
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void *so_emuldata; /* (b) private data for emulators */
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so_dtor_t *so_dtor; /* (b) optional destructor */
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struct osd osd; /* Object Specific extensions */
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/*
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* so_fibnum, so_user_cookie and friends can be used to attach
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* some user-specified metadata to a socket, which then can be
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* used by the kernel for various actions.
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* so_user_cookie is used by ipfw/dummynet.
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*/
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int so_fibnum; /* routing domain for this socket */
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uint32_t so_user_cookie;
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int so_ts_clock; /* type of the clock used for timestamps */
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uint32_t so_max_pacing_rate; /* (f) TX rate limit in bytes/s */
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union {
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/* Regular (data flow) socket. */
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struct {
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/* (cr, cs) Receive and send buffers. */
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struct sockbuf so_rcv, so_snd;
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/* (e) Our place on accept queue. */
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TAILQ_ENTRY(socket) so_list;
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struct socket *so_listen; /* (b) */
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enum {
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SQ_NONE = 0,
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SQ_INCOMP = 0x0800, /* on sol_incomp */
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SQ_COMP = 0x1000, /* on sol_comp */
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} so_qstate; /* (b) */
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/* (b) cached MAC label for peer */
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struct label *so_peerlabel;
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u_long so_oobmark; /* chars to oob mark */
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};
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/*
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* Listening socket, where accepts occur, is so_listen in all
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* subsidiary sockets. If so_listen is NULL, socket is not
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* related to an accept. For a listening socket itself
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* sol_incomp queues partially completed connections, while
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* sol_comp is a queue of connections ready to be accepted.
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* If a connection is aborted and it has so_listen set, then
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* it has to be pulled out of either sol_incomp or sol_comp.
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* We allow connections to queue up based on current queue
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* lengths and limit on number of queued connections for this
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* socket.
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*/
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struct {
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/* (e) queue of partial unaccepted connections */
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struct accept_queue sol_incomp;
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/* (e) queue of complete unaccepted connections */
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struct accept_queue sol_comp;
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u_int sol_qlen; /* (e) sol_comp length */
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u_int sol_incqlen; /* (e) sol_incomp length */
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u_int sol_qlimit; /* (e) queue limit */
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/* accept_filter(9) optional data */
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struct accept_filter *sol_accept_filter;
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void *sol_accept_filter_arg; /* saved filter args */
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char *sol_accept_filter_str; /* saved user args */
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/* Optional upcall, for kernel socket. */
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so_upcall_t *sol_upcall; /* (e) */
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void *sol_upcallarg; /* (e) */
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/* Socket buffer parameters, to be copied to
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* dataflow sockets, accepted from this one. */
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int sol_sbrcv_lowat;
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int sol_sbsnd_lowat;
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u_int sol_sbrcv_hiwat;
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u_int sol_sbsnd_hiwat;
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short sol_sbrcv_flags;
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short sol_sbsnd_flags;
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sbintime_t sol_sbrcv_timeo;
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sbintime_t sol_sbsnd_timeo;
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};
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};
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};
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#endif /* defined(_KERNEL) || defined(_WANT_SOCKET) */
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/*
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* Socket state bits.
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*
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* Historically, this bits were all kept in the so_state field. For
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* locking reasons, they are now in multiple fields, as they are
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* locked differently. so_state maintains basic socket state protected
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* by the socket lock. so_qstate holds information about the socket
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* accept queues. Each socket buffer also has a state field holding
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* information relevant to that socket buffer (can't send, rcv). Many
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* fields will be read without locks to improve performance and avoid
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* lock order issues. However, this approach must be used with caution.
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*/
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#define SS_NOFDREF 0x0001 /* no file table ref any more */
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#define SS_ISCONNECTED 0x0002 /* socket connected to a peer */
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#define SS_ISCONNECTING 0x0004 /* in process of connecting to peer */
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#define SS_ISDISCONNECTING 0x0008 /* in process of disconnecting */
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#define SS_NBIO 0x0100 /* non-blocking ops */
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#define SS_ASYNC 0x0200 /* async i/o notify */
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#define SS_ISCONFIRMING 0x0400 /* deciding to accept connection req */
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#define SS_ISDISCONNECTED 0x2000 /* socket disconnected from peer */
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/*
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* Protocols can mark a socket as SS_PROTOREF to indicate that, following
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* pru_detach, they still want the socket to persist, and will free it
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* themselves when they are done. Protocols should only ever call sofree()
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* following setting this flag in pru_detach(), and never otherwise, as
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* sofree() bypasses socket reference counting.
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*/
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#define SS_PROTOREF 0x4000 /* strong protocol reference */
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#ifdef _KERNEL
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#define SOCK_MTX(so) &(so)->so_lock
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#define SOCK_LOCK(so) mtx_lock(&(so)->so_lock)
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#define SOCK_OWNED(so) mtx_owned(&(so)->so_lock)
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#define SOCK_UNLOCK(so) mtx_unlock(&(so)->so_lock)
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#define SOCK_LOCK_ASSERT(so) mtx_assert(&(so)->so_lock, MA_OWNED)
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#define SOCK_UNLOCK_ASSERT(so) mtx_assert(&(so)->so_lock, MA_NOTOWNED)
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#define SOLISTENING(sol) (((sol)->so_options & SO_ACCEPTCONN) != 0)
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#define SOLISTEN_LOCK(sol) do { \
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mtx_lock(&(sol)->so_lock); \
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KASSERT(SOLISTENING(sol), \
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("%s: %p not listening", __func__, (sol))); \
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} while (0)
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#define SOLISTEN_TRYLOCK(sol) mtx_trylock(&(sol)->so_lock)
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#define SOLISTEN_UNLOCK(sol) do { \
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KASSERT(SOLISTENING(sol), \
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("%s: %p not listening", __func__, (sol))); \
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mtx_unlock(&(sol)->so_lock); \
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} while (0)
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#define SOLISTEN_LOCK_ASSERT(sol) do { \
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mtx_assert(&(sol)->so_lock, MA_OWNED); \
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KASSERT(SOLISTENING(sol), \
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("%s: %p not listening", __func__, (sol))); \
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} while (0)
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/*
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* Macros for sockets and socket buffering.
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*/
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/*
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* Flags to sblock().
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*/
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#define SBL_WAIT 0x00000001 /* Wait if not immediately available. */
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#define SBL_NOINTR 0x00000002 /* Force non-interruptible sleep. */
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#define SBL_VALID (SBL_WAIT | SBL_NOINTR)
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/*
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* Do we need to notify the other side when I/O is possible?
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*/
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#define sb_notify(sb) (((sb)->sb_flags & (SB_WAIT | SB_SEL | SB_ASYNC | \
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SB_UPCALL | SB_AIO | SB_KNOTE)) != 0)
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/* do we have to send all at once on a socket? */
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#define sosendallatonce(so) \
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((so)->so_proto->pr_flags & PR_ATOMIC)
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/* can we read something from so? */
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#define soreadabledata(so) \
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(sbavail(&(so)->so_rcv) >= (so)->so_rcv.sb_lowat || (so)->so_error)
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#define soreadable(so) \
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(soreadabledata(so) || ((so)->so_rcv.sb_state & SBS_CANTRCVMORE))
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/* can we write something to so? */
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#define sowriteable(so) \
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((sbspace(&(so)->so_snd) >= (so)->so_snd.sb_lowat && \
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(((so)->so_state&SS_ISCONNECTED) || \
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((so)->so_proto->pr_flags&PR_CONNREQUIRED)==0)) || \
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((so)->so_snd.sb_state & SBS_CANTSENDMORE) || \
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(so)->so_error)
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/*
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* soref()/sorele() ref-count the socket structure.
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* soref() may be called without owning socket lock, but in that case a
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* caller must own something that holds socket, and so_count must be not 0.
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* Note that you must still explicitly close the socket, but the last ref
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* count will free the structure.
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*/
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#define soref(so) refcount_acquire(&(so)->so_count)
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#define sorele(so) do { \
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SOCK_LOCK_ASSERT(so); \
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if (refcount_release(&(so)->so_count)) \
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sofree(so); \
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else \
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SOCK_UNLOCK(so); \
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} while (0)
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/*
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* In sorwakeup() and sowwakeup(), acquire the socket buffer lock to
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* avoid a non-atomic test-and-wakeup. However, sowakeup is
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* responsible for releasing the lock if it is called. We unlock only
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* if we don't call into sowakeup. If any code is introduced that
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* directly invokes the underlying sowakeup() primitives, it must
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* maintain the same semantics.
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*/
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#define sorwakeup_locked(so) do { \
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SOCKBUF_LOCK_ASSERT(&(so)->so_rcv); \
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if (sb_notify(&(so)->so_rcv)) \
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sowakeup((so), &(so)->so_rcv); \
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else \
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SOCKBUF_UNLOCK(&(so)->so_rcv); \
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} while (0)
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#define sorwakeup(so) do { \
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SOCKBUF_LOCK(&(so)->so_rcv); \
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sorwakeup_locked(so); \
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} while (0)
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#define sowwakeup_locked(so) do { \
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SOCKBUF_LOCK_ASSERT(&(so)->so_snd); \
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if (sb_notify(&(so)->so_snd)) \
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sowakeup((so), &(so)->so_snd); \
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else \
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SOCKBUF_UNLOCK(&(so)->so_snd); \
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} while (0)
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#define sowwakeup(so) do { \
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SOCKBUF_LOCK(&(so)->so_snd); \
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sowwakeup_locked(so); \
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} while (0)
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struct accept_filter {
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char accf_name[16];
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int (*accf_callback)
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(struct socket *so, void *arg, int waitflag);
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void * (*accf_create)
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(struct socket *so, char *arg);
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void (*accf_destroy)
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(struct socket *so);
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SLIST_ENTRY(accept_filter) accf_next;
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};
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#ifdef MALLOC_DECLARE
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MALLOC_DECLARE(M_ACCF);
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MALLOC_DECLARE(M_PCB);
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MALLOC_DECLARE(M_SONAME);
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#endif
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/*
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* Socket specific helper hook point identifiers
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* Do not leave holes in the sequence, hook registration is a loop.
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*/
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#define HHOOK_SOCKET_OPT 0
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#define HHOOK_SOCKET_CREATE 1
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#define HHOOK_SOCKET_RCV 2
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#define HHOOK_SOCKET_SND 3
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#define HHOOK_FILT_SOREAD 4
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#define HHOOK_FILT_SOWRITE 5
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#define HHOOK_SOCKET_CLOSE 6
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#define HHOOK_SOCKET_LAST HHOOK_SOCKET_CLOSE
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struct socket_hhook_data {
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struct socket *so;
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struct mbuf *m;
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void *hctx; /* hook point specific data*/
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int status;
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};
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extern int maxsockets;
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extern u_long sb_max;
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extern so_gen_t so_gencnt;
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struct file;
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struct filecaps;
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struct filedesc;
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struct mbuf;
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struct sockaddr;
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struct ucred;
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struct uio;
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/* 'which' values for socket upcalls. */
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#define SO_RCV 1
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#define SO_SND 2
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/* Return values for socket upcalls. */
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#define SU_OK 0
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#define SU_ISCONNECTED 1
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/*
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* From uipc_socket and friends
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*/
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int getsockaddr(struct sockaddr **namp, const struct sockaddr *uaddr,
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size_t len);
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int getsock_cap(struct thread *td, int fd, cap_rights_t *rightsp,
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struct file **fpp, u_int *fflagp, struct filecaps *havecaps);
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void soabort(struct socket *so);
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int soaccept(struct socket *so, struct sockaddr **nam);
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void soaio_enqueue(struct task *task);
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void soaio_rcv(void *context, int pending);
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void soaio_snd(void *context, int pending);
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int socheckuid(struct socket *so, uid_t uid);
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int sobind(struct socket *so, struct sockaddr *nam, struct thread *td);
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int sobindat(int fd, struct socket *so, struct sockaddr *nam,
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struct thread *td);
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int soclose(struct socket *so);
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int soconnect(struct socket *so, struct sockaddr *nam, struct thread *td);
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int soconnectat(int fd, struct socket *so, struct sockaddr *nam,
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struct thread *td);
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int soconnect2(struct socket *so1, struct socket *so2);
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int socreate(int dom, struct socket **aso, int type, int proto,
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struct ucred *cred, struct thread *td);
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int sodisconnect(struct socket *so);
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void sodtor_set(struct socket *, so_dtor_t *);
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struct sockaddr *sodupsockaddr(const struct sockaddr *sa, int mflags);
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void sofree(struct socket *so);
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void sohasoutofband(struct socket *so);
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int solisten(struct socket *so, int backlog, struct thread *td);
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void solisten_proto(struct socket *so, int backlog);
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int solisten_proto_check(struct socket *so);
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int solisten_dequeue(struct socket *, struct socket **, int);
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struct socket *
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sonewconn(struct socket *head, int connstatus);
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struct socket *
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sopeeloff(struct socket *);
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int sopoll(struct socket *so, int events, struct ucred *active_cred,
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struct thread *td);
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int sopoll_generic(struct socket *so, int events,
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struct ucred *active_cred, struct thread *td);
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int soreceive(struct socket *so, struct sockaddr **paddr, struct uio *uio,
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struct mbuf **mp0, struct mbuf **controlp, int *flagsp);
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int soreceive_stream(struct socket *so, struct sockaddr **paddr,
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struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
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int *flagsp);
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int soreceive_dgram(struct socket *so, struct sockaddr **paddr,
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struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
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int *flagsp);
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int soreceive_generic(struct socket *so, struct sockaddr **paddr,
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struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
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int *flagsp);
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int soreserve(struct socket *so, u_long sndcc, u_long rcvcc);
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void sorflush(struct socket *so);
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int sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
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struct mbuf *top, struct mbuf *control, int flags,
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struct thread *td);
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int sosend_dgram(struct socket *so, struct sockaddr *addr,
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struct uio *uio, struct mbuf *top, struct mbuf *control,
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int flags, struct thread *td);
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int sosend_generic(struct socket *so, struct sockaddr *addr,
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struct uio *uio, struct mbuf *top, struct mbuf *control,
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int flags, struct thread *td);
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int soshutdown(struct socket *so, int how);
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void soupcall_clear(struct socket *, int);
|
|
void soupcall_set(struct socket *, int, so_upcall_t, void *);
|
|
void solisten_upcall_set(struct socket *, so_upcall_t, void *);
|
|
void sowakeup(struct socket *so, struct sockbuf *sb);
|
|
void sowakeup_aio(struct socket *so, struct sockbuf *sb);
|
|
void solisten_wakeup(struct socket *);
|
|
int selsocket(struct socket *so, int events, struct timeval *tv,
|
|
struct thread *td);
|
|
void soisconnected(struct socket *so);
|
|
void soisconnecting(struct socket *so);
|
|
void soisdisconnected(struct socket *so);
|
|
void soisdisconnecting(struct socket *so);
|
|
void socantrcvmore(struct socket *so);
|
|
void socantrcvmore_locked(struct socket *so);
|
|
void socantsendmore(struct socket *so);
|
|
void socantsendmore_locked(struct socket *so);
|
|
|
|
/*
|
|
* Accept filter functions (duh).
|
|
*/
|
|
int accept_filt_add(struct accept_filter *filt);
|
|
int accept_filt_del(char *name);
|
|
struct accept_filter *accept_filt_get(char *name);
|
|
#ifdef ACCEPT_FILTER_MOD
|
|
#ifdef SYSCTL_DECL
|
|
SYSCTL_DECL(_net_inet_accf);
|
|
#endif
|
|
int accept_filt_generic_mod_event(module_t mod, int event, void *data);
|
|
#endif
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
/*
|
|
* Structure to export socket from kernel to utilities, via sysctl(3).
|
|
*/
|
|
struct xsocket {
|
|
ksize_t xso_len; /* length of this structure */
|
|
kvaddr_t xso_so; /* kernel address of struct socket */
|
|
kvaddr_t so_pcb; /* kernel address of struct inpcb */
|
|
uint64_t so_oobmark;
|
|
int64_t so_spare64[8];
|
|
int32_t xso_protocol;
|
|
int32_t xso_family;
|
|
uint32_t so_qlen;
|
|
uint32_t so_incqlen;
|
|
uint32_t so_qlimit;
|
|
pid_t so_pgid;
|
|
uid_t so_uid;
|
|
int32_t so_spare32[8];
|
|
int16_t so_type;
|
|
int16_t so_options;
|
|
int16_t so_linger;
|
|
int16_t so_state;
|
|
int16_t so_timeo;
|
|
uint16_t so_error;
|
|
struct xsockbuf {
|
|
uint32_t sb_cc;
|
|
uint32_t sb_hiwat;
|
|
uint32_t sb_mbcnt;
|
|
uint32_t sb_mcnt;
|
|
uint32_t sb_ccnt;
|
|
uint32_t sb_mbmax;
|
|
int32_t sb_lowat;
|
|
int32_t sb_timeo;
|
|
int16_t sb_flags;
|
|
} so_rcv, so_snd;
|
|
};
|
|
|
|
#ifdef _KERNEL
|
|
void sotoxsocket(struct socket *so, struct xsocket *xso);
|
|
void sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb);
|
|
#endif
|
|
|
|
/*
|
|
* Socket buffer state bits. Exported via libprocstat(3).
|
|
*/
|
|
#define SBS_CANTSENDMORE 0x0010 /* can't send more data to peer */
|
|
#define SBS_CANTRCVMORE 0x0020 /* can't receive more data from peer */
|
|
#define SBS_RCVATMARK 0x0040 /* at mark on input */
|
|
|
|
#endif /* !_SYS_SOCKETVAR_H_ */
|