mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
b8ae1cd619
intended for use solely with atomic datagram socket types, and relies on the previous break-out of sosend_copyin(). Changes to allow UDP to optionally use this instead of sosend() will be committed as a follow-up.
2377 lines
60 KiB
C
2377 lines
60 KiB
C
/*-
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* Copyright (c) 2004 The FreeBSD Foundation
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* Copyright (c) 2004-2005 Robert N. M. Watson
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* Copyright (c) 1982, 1986, 1988, 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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* 4. 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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* @(#)uipc_socket.c 8.3 (Berkeley) 4/15/94
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_mac.h"
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#include "opt_zero.h"
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#include "opt_compat.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/fcntl.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/mac.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/mutex.h>
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#include <sys/domain.h>
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#include <sys/file.h> /* for struct knote */
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#include <sys/kernel.h>
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#include <sys/event.h>
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#include <sys/poll.h>
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#include <sys/proc.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/resourcevar.h>
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#include <sys/signalvar.h>
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#include <sys/sysctl.h>
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#include <sys/uio.h>
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#include <sys/jail.h>
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#include <vm/uma.h>
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#ifdef COMPAT_IA32
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#include <sys/mount.h>
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#include <compat/freebsd32/freebsd32.h>
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extern struct sysentvec ia32_freebsd_sysvec;
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#endif
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static int soreceive_rcvoob(struct socket *so, struct uio *uio,
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int flags);
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static void filt_sordetach(struct knote *kn);
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static int filt_soread(struct knote *kn, long hint);
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static void filt_sowdetach(struct knote *kn);
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static int filt_sowrite(struct knote *kn, long hint);
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static int filt_solisten(struct knote *kn, long hint);
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static struct filterops solisten_filtops =
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{ 1, NULL, filt_sordetach, filt_solisten };
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static struct filterops soread_filtops =
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{ 1, NULL, filt_sordetach, filt_soread };
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static struct filterops sowrite_filtops =
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{ 1, NULL, filt_sowdetach, filt_sowrite };
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uma_zone_t socket_zone;
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so_gen_t so_gencnt; /* generation count for sockets */
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MALLOC_DEFINE(M_SONAME, "soname", "socket name");
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MALLOC_DEFINE(M_PCB, "pcb", "protocol control block");
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SYSCTL_DECL(_kern_ipc);
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static int somaxconn = SOMAXCONN;
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static int somaxconn_sysctl(SYSCTL_HANDLER_ARGS);
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/* XXX: we dont have SYSCTL_USHORT */
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SYSCTL_PROC(_kern_ipc, KIPC_SOMAXCONN, somaxconn, CTLTYPE_UINT | CTLFLAG_RW,
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0, sizeof(int), somaxconn_sysctl, "I", "Maximum pending socket connection "
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"queue size");
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static int numopensockets;
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SYSCTL_INT(_kern_ipc, OID_AUTO, numopensockets, CTLFLAG_RD,
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&numopensockets, 0, "Number of open sockets");
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#ifdef ZERO_COPY_SOCKETS
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/* These aren't static because they're used in other files. */
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int so_zero_copy_send = 1;
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int so_zero_copy_receive = 1;
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SYSCTL_NODE(_kern_ipc, OID_AUTO, zero_copy, CTLFLAG_RD, 0,
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"Zero copy controls");
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SYSCTL_INT(_kern_ipc_zero_copy, OID_AUTO, receive, CTLFLAG_RW,
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&so_zero_copy_receive, 0, "Enable zero copy receive");
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SYSCTL_INT(_kern_ipc_zero_copy, OID_AUTO, send, CTLFLAG_RW,
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&so_zero_copy_send, 0, "Enable zero copy send");
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#endif /* ZERO_COPY_SOCKETS */
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/*
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* accept_mtx locks down per-socket fields relating to accept queues. See
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* socketvar.h for an annotation of the protected fields of struct socket.
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*/
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struct mtx accept_mtx;
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MTX_SYSINIT(accept_mtx, &accept_mtx, "accept", MTX_DEF);
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/*
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* so_global_mtx protects so_gencnt, numopensockets, and the per-socket
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* so_gencnt field.
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*/
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static struct mtx so_global_mtx;
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MTX_SYSINIT(so_global_mtx, &so_global_mtx, "so_glabel", MTX_DEF);
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/*
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* Socket operation routines.
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* These routines are called by the routines in
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* sys_socket.c or from a system process, and
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* implement the semantics of socket operations by
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* switching out to the protocol specific routines.
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*/
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/*
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* Get a socket structure from our zone, and initialize it.
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* Note that it would probably be better to allocate socket
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* and PCB at the same time, but I'm not convinced that all
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* the protocols can be easily modified to do this.
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*
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* soalloc() returns a socket with a ref count of 0.
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*/
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struct socket *
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soalloc(int mflags)
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{
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struct socket *so;
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so = uma_zalloc(socket_zone, mflags | M_ZERO);
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if (so != NULL) {
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#ifdef MAC
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if (mac_init_socket(so, mflags) != 0) {
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uma_zfree(socket_zone, so);
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return (NULL);
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}
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#endif
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SOCKBUF_LOCK_INIT(&so->so_snd, "so_snd");
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SOCKBUF_LOCK_INIT(&so->so_rcv, "so_rcv");
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TAILQ_INIT(&so->so_aiojobq);
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mtx_lock(&so_global_mtx);
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so->so_gencnt = ++so_gencnt;
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++numopensockets;
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mtx_unlock(&so_global_mtx);
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}
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return (so);
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}
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/*
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* socreate returns a socket with a ref count of 1. The socket should be
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* closed with soclose().
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*/
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int
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socreate(dom, aso, type, proto, cred, td)
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int dom;
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struct socket **aso;
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int type;
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int proto;
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struct ucred *cred;
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struct thread *td;
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{
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struct protosw *prp;
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struct socket *so;
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int error;
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if (proto)
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prp = pffindproto(dom, proto, type);
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else
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prp = pffindtype(dom, type);
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if (prp == NULL || prp->pr_usrreqs->pru_attach == NULL ||
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prp->pr_usrreqs->pru_attach == pru_attach_notsupp)
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return (EPROTONOSUPPORT);
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if (jailed(cred) && jail_socket_unixiproute_only &&
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prp->pr_domain->dom_family != PF_LOCAL &&
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prp->pr_domain->dom_family != PF_INET &&
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prp->pr_domain->dom_family != PF_ROUTE) {
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return (EPROTONOSUPPORT);
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}
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if (prp->pr_type != type)
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return (EPROTOTYPE);
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so = soalloc(M_WAITOK);
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if (so == NULL)
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return (ENOBUFS);
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TAILQ_INIT(&so->so_incomp);
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TAILQ_INIT(&so->so_comp);
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so->so_type = type;
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so->so_cred = crhold(cred);
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so->so_proto = prp;
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#ifdef MAC
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mac_create_socket(cred, so);
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#endif
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knlist_init(&so->so_rcv.sb_sel.si_note, SOCKBUF_MTX(&so->so_rcv),
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NULL, NULL, NULL);
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knlist_init(&so->so_snd.sb_sel.si_note, SOCKBUF_MTX(&so->so_snd),
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NULL, NULL, NULL);
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so->so_count = 1;
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error = (*prp->pr_usrreqs->pru_attach)(so, proto, td);
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if (error) {
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ACCEPT_LOCK();
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SOCK_LOCK(so);
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so->so_state |= SS_NOFDREF;
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sorele(so);
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return (error);
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}
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*aso = so;
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return (0);
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}
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int
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sobind(so, nam, td)
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struct socket *so;
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struct sockaddr *nam;
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struct thread *td;
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{
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return ((*so->so_proto->pr_usrreqs->pru_bind)(so, nam, td));
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}
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void
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sodealloc(struct socket *so)
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{
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KASSERT(so->so_count == 0, ("sodealloc(): so_count %d", so->so_count));
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mtx_lock(&so_global_mtx);
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so->so_gencnt = ++so_gencnt;
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mtx_unlock(&so_global_mtx);
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if (so->so_rcv.sb_hiwat)
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(void)chgsbsize(so->so_cred->cr_uidinfo,
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&so->so_rcv.sb_hiwat, 0, RLIM_INFINITY);
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if (so->so_snd.sb_hiwat)
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(void)chgsbsize(so->so_cred->cr_uidinfo,
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&so->so_snd.sb_hiwat, 0, RLIM_INFINITY);
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#ifdef INET
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/* remove acccept filter if one is present. */
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if (so->so_accf != NULL)
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do_setopt_accept_filter(so, NULL);
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#endif
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#ifdef MAC
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mac_destroy_socket(so);
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#endif
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crfree(so->so_cred);
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SOCKBUF_LOCK_DESTROY(&so->so_snd);
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SOCKBUF_LOCK_DESTROY(&so->so_rcv);
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uma_zfree(socket_zone, so);
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mtx_lock(&so_global_mtx);
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--numopensockets;
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mtx_unlock(&so_global_mtx);
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}
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/*
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* solisten() transitions a socket from a non-listening state to a listening
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* state, but can also be used to update the listen queue depth on an
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* existing listen socket. The protocol will call back into the sockets
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* layer using solisten_proto_check() and solisten_proto() to check and set
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* socket-layer listen state. Call backs are used so that the protocol can
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* acquire both protocol and socket layer locks in whatever order is required
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* by the protocol.
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*
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* Protocol implementors are advised to hold the socket lock across the
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* socket-layer test and set to avoid races at the socket layer.
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*/
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int
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solisten(so, backlog, td)
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struct socket *so;
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int backlog;
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struct thread *td;
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{
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return ((*so->so_proto->pr_usrreqs->pru_listen)(so, backlog, td));
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}
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int
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solisten_proto_check(so)
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struct socket *so;
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{
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SOCK_LOCK_ASSERT(so);
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if (so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
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SS_ISDISCONNECTING))
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return (EINVAL);
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return (0);
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}
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void
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solisten_proto(so, backlog)
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struct socket *so;
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int backlog;
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{
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SOCK_LOCK_ASSERT(so);
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if (backlog < 0 || backlog > somaxconn)
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backlog = somaxconn;
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so->so_qlimit = backlog;
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so->so_options |= SO_ACCEPTCONN;
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}
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/*
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* Attempt to free a socket. This should really be sotryfree().
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*
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* We free the socket if the protocol is no longer interested in the socket,
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* there's no file descriptor reference, and the refcount is 0. While the
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* calling macro sotryfree() tests the refcount, sofree() has to test it
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* again as it's possible to race with an accept()ing thread if the socket is
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* in an listen queue of a listen socket, as being in the listen queue
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* doesn't elevate the reference count. sofree() acquires the accept mutex
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* early for this test in order to avoid that race.
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*/
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void
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sofree(so)
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struct socket *so;
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{
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struct socket *head;
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ACCEPT_LOCK_ASSERT();
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SOCK_LOCK_ASSERT(so);
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if (so->so_pcb != NULL || (so->so_state & SS_NOFDREF) == 0 ||
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so->so_count != 0) {
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SOCK_UNLOCK(so);
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ACCEPT_UNLOCK();
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return;
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}
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head = so->so_head;
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if (head != NULL) {
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KASSERT((so->so_qstate & SQ_COMP) != 0 ||
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(so->so_qstate & SQ_INCOMP) != 0,
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("sofree: so_head != NULL, but neither SQ_COMP nor "
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"SQ_INCOMP"));
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KASSERT((so->so_qstate & SQ_COMP) == 0 ||
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(so->so_qstate & SQ_INCOMP) == 0,
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("sofree: so->so_qstate is SQ_COMP and also SQ_INCOMP"));
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/*
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* accept(2) is responsible draining the completed
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* connection queue and freeing those sockets, so
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* we just return here if this socket is currently
|
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* on the completed connection queue. Otherwise,
|
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* accept(2) may hang after select(2) has indicating
|
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* that a listening socket was ready. If it's an
|
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* incomplete connection, we remove it from the queue
|
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* and free it; otherwise, it won't be released until
|
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* the listening socket is closed.
|
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*/
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if ((so->so_qstate & SQ_COMP) != 0) {
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SOCK_UNLOCK(so);
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ACCEPT_UNLOCK();
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return;
|
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}
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TAILQ_REMOVE(&head->so_incomp, so, so_list);
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head->so_incqlen--;
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so->so_qstate &= ~SQ_INCOMP;
|
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so->so_head = NULL;
|
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}
|
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KASSERT((so->so_qstate & SQ_COMP) == 0 &&
|
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(so->so_qstate & SQ_INCOMP) == 0,
|
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("sofree: so_head == NULL, but still SQ_COMP(%d) or SQ_INCOMP(%d)",
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so->so_qstate & SQ_COMP, so->so_qstate & SQ_INCOMP));
|
|
SOCK_UNLOCK(so);
|
|
ACCEPT_UNLOCK();
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
so->so_snd.sb_flags |= SB_NOINTR;
|
|
(void)sblock(&so->so_snd, M_WAITOK);
|
|
/*
|
|
* socantsendmore_locked() drops the socket buffer mutex so that it
|
|
* can safely perform wakeups. Re-acquire the mutex before
|
|
* continuing.
|
|
*/
|
|
socantsendmore_locked(so);
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
sbunlock(&so->so_snd);
|
|
sbrelease_locked(&so->so_snd, so);
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
sorflush(so);
|
|
knlist_destroy(&so->so_rcv.sb_sel.si_note);
|
|
knlist_destroy(&so->so_snd.sb_sel.si_note);
|
|
sodealloc(so);
|
|
}
|
|
|
|
/*
|
|
* Close a socket on last file table reference removal.
|
|
* Initiate disconnect if connected.
|
|
* Free socket when disconnect complete.
|
|
*
|
|
* This function will sorele() the socket. Note that soclose() may be
|
|
* called prior to the ref count reaching zero. The actual socket
|
|
* structure will not be freed until the ref count reaches zero.
|
|
*/
|
|
int
|
|
soclose(so)
|
|
struct socket *so;
|
|
{
|
|
int error = 0;
|
|
|
|
KASSERT(!(so->so_state & SS_NOFDREF), ("soclose: SS_NOFDREF on enter"));
|
|
|
|
funsetown(&so->so_sigio);
|
|
if (so->so_options & SO_ACCEPTCONN) {
|
|
struct socket *sp;
|
|
ACCEPT_LOCK();
|
|
while ((sp = TAILQ_FIRST(&so->so_incomp)) != NULL) {
|
|
TAILQ_REMOVE(&so->so_incomp, sp, so_list);
|
|
so->so_incqlen--;
|
|
sp->so_qstate &= ~SQ_INCOMP;
|
|
sp->so_head = NULL;
|
|
ACCEPT_UNLOCK();
|
|
(void) soabort(sp);
|
|
ACCEPT_LOCK();
|
|
}
|
|
while ((sp = TAILQ_FIRST(&so->so_comp)) != NULL) {
|
|
TAILQ_REMOVE(&so->so_comp, sp, so_list);
|
|
so->so_qlen--;
|
|
sp->so_qstate &= ~SQ_COMP;
|
|
sp->so_head = NULL;
|
|
ACCEPT_UNLOCK();
|
|
(void) soabort(sp);
|
|
ACCEPT_LOCK();
|
|
}
|
|
ACCEPT_UNLOCK();
|
|
}
|
|
if (so->so_pcb == NULL)
|
|
goto discard;
|
|
if (so->so_state & SS_ISCONNECTED) {
|
|
if ((so->so_state & SS_ISDISCONNECTING) == 0) {
|
|
error = sodisconnect(so);
|
|
if (error)
|
|
goto drop;
|
|
}
|
|
if (so->so_options & SO_LINGER) {
|
|
if ((so->so_state & SS_ISDISCONNECTING) &&
|
|
(so->so_state & SS_NBIO))
|
|
goto drop;
|
|
while (so->so_state & SS_ISCONNECTED) {
|
|
error = tsleep(&so->so_timeo,
|
|
PSOCK | PCATCH, "soclos", so->so_linger * hz);
|
|
if (error)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
drop:
|
|
if (so->so_pcb != NULL) {
|
|
int error2 = (*so->so_proto->pr_usrreqs->pru_detach)(so);
|
|
if (error == 0)
|
|
error = error2;
|
|
}
|
|
discard:
|
|
ACCEPT_LOCK();
|
|
SOCK_LOCK(so);
|
|
KASSERT((so->so_state & SS_NOFDREF) == 0, ("soclose: NOFDREF"));
|
|
so->so_state |= SS_NOFDREF;
|
|
sorele(so);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* soabort() must not be called with any socket locks held, as it calls
|
|
* into the protocol, which will call back into the socket code causing
|
|
* it to acquire additional socket locks that may cause recursion or lock
|
|
* order reversals.
|
|
*/
|
|
int
|
|
soabort(so)
|
|
struct socket *so;
|
|
{
|
|
int error;
|
|
|
|
error = (*so->so_proto->pr_usrreqs->pru_abort)(so);
|
|
if (error) {
|
|
ACCEPT_LOCK();
|
|
SOCK_LOCK(so);
|
|
sotryfree(so); /* note: does not decrement the ref count */
|
|
return error;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
soaccept(so, nam)
|
|
struct socket *so;
|
|
struct sockaddr **nam;
|
|
{
|
|
int error;
|
|
|
|
SOCK_LOCK(so);
|
|
KASSERT((so->so_state & SS_NOFDREF) != 0, ("soaccept: !NOFDREF"));
|
|
so->so_state &= ~SS_NOFDREF;
|
|
SOCK_UNLOCK(so);
|
|
error = (*so->so_proto->pr_usrreqs->pru_accept)(so, nam);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
soconnect(so, nam, td)
|
|
struct socket *so;
|
|
struct sockaddr *nam;
|
|
struct thread *td;
|
|
{
|
|
int error;
|
|
|
|
if (so->so_options & SO_ACCEPTCONN)
|
|
return (EOPNOTSUPP);
|
|
/*
|
|
* If protocol is connection-based, can only connect once.
|
|
* Otherwise, if connected, try to disconnect first.
|
|
* This allows user to disconnect by connecting to, e.g.,
|
|
* a null address.
|
|
*/
|
|
if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
|
|
((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
|
|
(error = sodisconnect(so)))) {
|
|
error = EISCONN;
|
|
} else {
|
|
/*
|
|
* Prevent accumulated error from previous connection
|
|
* from biting us.
|
|
*/
|
|
so->so_error = 0;
|
|
error = (*so->so_proto->pr_usrreqs->pru_connect)(so, nam, td);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
soconnect2(so1, so2)
|
|
struct socket *so1;
|
|
struct socket *so2;
|
|
{
|
|
|
|
return ((*so1->so_proto->pr_usrreqs->pru_connect2)(so1, so2));
|
|
}
|
|
|
|
int
|
|
sodisconnect(so)
|
|
struct socket *so;
|
|
{
|
|
int error;
|
|
|
|
if ((so->so_state & SS_ISCONNECTED) == 0)
|
|
return (ENOTCONN);
|
|
if (so->so_state & SS_ISDISCONNECTING)
|
|
return (EALREADY);
|
|
error = (*so->so_proto->pr_usrreqs->pru_disconnect)(so);
|
|
return (error);
|
|
}
|
|
|
|
#ifdef ZERO_COPY_SOCKETS
|
|
struct so_zerocopy_stats{
|
|
int size_ok;
|
|
int align_ok;
|
|
int found_ifp;
|
|
};
|
|
struct so_zerocopy_stats so_zerocp_stats = {0,0,0};
|
|
#include <netinet/in.h>
|
|
#include <net/route.h>
|
|
#include <netinet/in_pcb.h>
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_page.h>
|
|
#include <vm/vm_object.h>
|
|
#endif /*ZERO_COPY_SOCKETS*/
|
|
|
|
/*
|
|
* sosend_copyin() accepts a uio and prepares an mbuf chain holding part or
|
|
* all of the data referenced by the uio. If desired, it uses zero-copy.
|
|
* *space will be updated to reflect data copied in.
|
|
*
|
|
* NB: If atomic I/O is requested, the caller must already have checked that
|
|
* space can hold resid bytes.
|
|
*
|
|
* NB: In the event of an error, the caller may need to free the partial
|
|
* chain pointed to by *mpp. The contents of both *uio and *space may be
|
|
* modified even in the case of an error.
|
|
*/
|
|
static int
|
|
sosend_copyin(struct uio *uio, struct mbuf **retmp, int atomic, long *space,
|
|
int flags)
|
|
{
|
|
struct mbuf *m, **mp, *top;
|
|
long len, resid;
|
|
int error;
|
|
#ifdef ZERO_COPY_SOCKETS
|
|
int cow_send;
|
|
#endif
|
|
|
|
*retmp = top = NULL;
|
|
mp = ⊤
|
|
len = 0;
|
|
resid = uio->uio_resid;
|
|
error = 0;
|
|
do {
|
|
#ifdef ZERO_COPY_SOCKETS
|
|
cow_send = 0;
|
|
#endif /* ZERO_COPY_SOCKETS */
|
|
if (resid >= MINCLSIZE) {
|
|
#ifdef ZERO_COPY_SOCKETS
|
|
if (top == NULL) {
|
|
MGETHDR(m, M_TRYWAIT, MT_DATA);
|
|
if (m == NULL) {
|
|
error = ENOBUFS;
|
|
goto out;
|
|
}
|
|
m->m_pkthdr.len = 0;
|
|
m->m_pkthdr.rcvif = NULL;
|
|
} else {
|
|
MGET(m, M_TRYWAIT, MT_DATA);
|
|
if (m == NULL) {
|
|
error = ENOBUFS;
|
|
goto out;
|
|
}
|
|
}
|
|
if (so_zero_copy_send &&
|
|
resid>=PAGE_SIZE &&
|
|
*space>=PAGE_SIZE &&
|
|
uio->uio_iov->iov_len>=PAGE_SIZE) {
|
|
so_zerocp_stats.size_ok++;
|
|
so_zerocp_stats.align_ok++;
|
|
cow_send = socow_setup(m, uio);
|
|
len = cow_send;
|
|
}
|
|
if (!cow_send) {
|
|
MCLGET(m, M_TRYWAIT);
|
|
if ((m->m_flags & M_EXT) == 0) {
|
|
m_free(m);
|
|
m = NULL;
|
|
} else {
|
|
len = min(min(MCLBYTES, resid),
|
|
*space);
|
|
}
|
|
}
|
|
#else /* ZERO_COPY_SOCKETS */
|
|
if (top == NULL) {
|
|
m = m_getcl(M_TRYWAIT, MT_DATA, M_PKTHDR);
|
|
m->m_pkthdr.len = 0;
|
|
m->m_pkthdr.rcvif = NULL;
|
|
} else
|
|
m = m_getcl(M_TRYWAIT, MT_DATA, 0);
|
|
len = min(min(MCLBYTES, resid), *space);
|
|
#endif /* ZERO_COPY_SOCKETS */
|
|
} else {
|
|
if (top == NULL) {
|
|
m = m_gethdr(M_TRYWAIT, MT_DATA);
|
|
m->m_pkthdr.len = 0;
|
|
m->m_pkthdr.rcvif = NULL;
|
|
|
|
len = min(min(MHLEN, resid), *space);
|
|
/*
|
|
* For datagram protocols, leave room
|
|
* for protocol headers in first mbuf.
|
|
*/
|
|
if (atomic && m && len < MHLEN)
|
|
MH_ALIGN(m, len);
|
|
} else {
|
|
m = m_get(M_TRYWAIT, MT_DATA);
|
|
len = min(min(MLEN, resid), *space);
|
|
}
|
|
}
|
|
if (m == NULL) {
|
|
error = ENOBUFS;
|
|
goto out;
|
|
}
|
|
|
|
*space -= len;
|
|
#ifdef ZERO_COPY_SOCKETS
|
|
if (cow_send)
|
|
error = 0;
|
|
else
|
|
#endif /* ZERO_COPY_SOCKETS */
|
|
error = uiomove(mtod(m, void *), (int)len, uio);
|
|
resid = uio->uio_resid;
|
|
m->m_len = len;
|
|
*mp = m;
|
|
top->m_pkthdr.len += len;
|
|
if (error)
|
|
goto out;
|
|
mp = &m->m_next;
|
|
if (resid <= 0) {
|
|
if (flags & MSG_EOR)
|
|
top->m_flags |= M_EOR;
|
|
break;
|
|
}
|
|
} while (*space > 0 && atomic);
|
|
out:
|
|
*retmp = top;
|
|
return (error);
|
|
}
|
|
|
|
#define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
|
|
|
|
int
|
|
sosend_dgram(so, addr, uio, top, control, flags, td)
|
|
struct socket *so;
|
|
struct sockaddr *addr;
|
|
struct uio *uio;
|
|
struct mbuf *top;
|
|
struct mbuf *control;
|
|
int flags;
|
|
struct thread *td;
|
|
{
|
|
long space, resid;
|
|
int clen = 0, error, dontroute;
|
|
int atomic = sosendallatonce(so) || top;
|
|
|
|
KASSERT(so->so_type == SOCK_DGRAM, ("sodgram_send: !SOCK_DGRAM"));
|
|
KASSERT(so->so_proto->pr_flags & PR_ATOMIC,
|
|
("sodgram_send: !PR_ATOMIC"));
|
|
|
|
if (uio != NULL)
|
|
resid = uio->uio_resid;
|
|
else
|
|
resid = top->m_pkthdr.len;
|
|
/*
|
|
* In theory resid should be unsigned.
|
|
* However, space must be signed, as it might be less than 0
|
|
* if we over-committed, and we must use a signed comparison
|
|
* of space and resid. On the other hand, a negative resid
|
|
* causes us to loop sending 0-length segments to the protocol.
|
|
*
|
|
* Also check to make sure that MSG_EOR isn't used on SOCK_STREAM
|
|
* type sockets since that's an error.
|
|
*/
|
|
if (resid < 0) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
dontroute =
|
|
(flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0;
|
|
if (td != NULL)
|
|
td->td_proc->p_stats->p_ru.ru_msgsnd++;
|
|
if (control != NULL)
|
|
clen = control->m_len;
|
|
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
error = EPIPE;
|
|
goto out;
|
|
}
|
|
if (so->so_error) {
|
|
error = so->so_error;
|
|
so->so_error = 0;
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
goto out;
|
|
}
|
|
if ((so->so_state & SS_ISCONNECTED) == 0) {
|
|
/*
|
|
* `sendto' and `sendmsg' is allowed on a connection-
|
|
* based socket if it supports implied connect.
|
|
* Return ENOTCONN if not connected and no address is
|
|
* supplied.
|
|
*/
|
|
if ((so->so_proto->pr_flags & PR_CONNREQUIRED) &&
|
|
(so->so_proto->pr_flags & PR_IMPLOPCL) == 0) {
|
|
if ((so->so_state & SS_ISCONFIRMING) == 0 &&
|
|
!(resid == 0 && clen != 0)) {
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
error = ENOTCONN;
|
|
goto out;
|
|
}
|
|
} else if (addr == NULL) {
|
|
if (so->so_proto->pr_flags & PR_CONNREQUIRED)
|
|
error = ENOTCONN;
|
|
else
|
|
error = EDESTADDRREQ;
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Do we need MSG_OOB support in SOCK_DGRAM? Signs here may be a
|
|
* problem and need fixing.
|
|
*/
|
|
space = sbspace(&so->so_snd);
|
|
if (flags & MSG_OOB)
|
|
space += 1024;
|
|
space -= clen;
|
|
if (resid > space) {
|
|
error = EMSGSIZE;
|
|
goto out;
|
|
}
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
if (uio == NULL) {
|
|
resid = 0;
|
|
if (flags & MSG_EOR)
|
|
top->m_flags |= M_EOR;
|
|
} else {
|
|
error = sosend_copyin(uio, &top, atomic, &space, flags);
|
|
if (error)
|
|
goto out;
|
|
resid = uio->uio_resid;
|
|
}
|
|
KASSERT(resid == 0, ("sosend_dgram: resid != 0"));
|
|
/*
|
|
* XXXRW: Frobbing SO_DONTROUTE here is even worse without sblock
|
|
* than with.
|
|
*/
|
|
if (dontroute) {
|
|
SOCK_LOCK(so);
|
|
so->so_options |= SO_DONTROUTE;
|
|
SOCK_UNLOCK(so);
|
|
}
|
|
/*
|
|
* XXX all the SBS_CANTSENDMORE checks previously
|
|
* done could be out of date. We could have recieved
|
|
* a reset packet in an interrupt or maybe we slept
|
|
* while doing page faults in uiomove() etc. We could
|
|
* probably recheck again inside the locking protection
|
|
* here, but there are probably other places that this
|
|
* also happens. We must rethink this.
|
|
*/
|
|
error = (*so->so_proto->pr_usrreqs->pru_send)(so,
|
|
(flags & MSG_OOB) ? PRUS_OOB :
|
|
/*
|
|
* If the user set MSG_EOF, the protocol
|
|
* understands this flag and nothing left to
|
|
* send then use PRU_SEND_EOF instead of PRU_SEND.
|
|
*/
|
|
((flags & MSG_EOF) &&
|
|
(so->so_proto->pr_flags & PR_IMPLOPCL) &&
|
|
(resid <= 0)) ?
|
|
PRUS_EOF :
|
|
/* If there is more to send set PRUS_MORETOCOME */
|
|
(resid > 0 && space > 0) ? PRUS_MORETOCOME : 0,
|
|
top, addr, control, td);
|
|
if (dontroute) {
|
|
SOCK_LOCK(so);
|
|
so->so_options &= ~SO_DONTROUTE;
|
|
SOCK_UNLOCK(so);
|
|
}
|
|
clen = 0;
|
|
control = NULL;
|
|
top = NULL;
|
|
out:
|
|
if (top != NULL)
|
|
m_freem(top);
|
|
if (control != NULL)
|
|
m_freem(control);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Send on a socket.
|
|
* If send must go all at once and message is larger than
|
|
* send buffering, then hard error.
|
|
* Lock against other senders.
|
|
* If must go all at once and not enough room now, then
|
|
* inform user that this would block and do nothing.
|
|
* Otherwise, if nonblocking, send as much as possible.
|
|
* The data to be sent is described by "uio" if nonzero,
|
|
* otherwise by the mbuf chain "top" (which must be null
|
|
* if uio is not). Data provided in mbuf chain must be small
|
|
* enough to send all at once.
|
|
*
|
|
* Returns nonzero on error, timeout or signal; callers
|
|
* must check for short counts if EINTR/ERESTART are returned.
|
|
* Data and control buffers are freed on return.
|
|
*/
|
|
#define snderr(errno) { error = (errno); goto release; }
|
|
int
|
|
sosend(so, addr, uio, top, control, flags, td)
|
|
struct socket *so;
|
|
struct sockaddr *addr;
|
|
struct uio *uio;
|
|
struct mbuf *top;
|
|
struct mbuf *control;
|
|
int flags;
|
|
struct thread *td;
|
|
{
|
|
long space, resid;
|
|
int clen = 0, error, dontroute;
|
|
int atomic = sosendallatonce(so) || top;
|
|
|
|
if (uio != NULL)
|
|
resid = uio->uio_resid;
|
|
else
|
|
resid = top->m_pkthdr.len;
|
|
/*
|
|
* In theory resid should be unsigned.
|
|
* However, space must be signed, as it might be less than 0
|
|
* if we over-committed, and we must use a signed comparison
|
|
* of space and resid. On the other hand, a negative resid
|
|
* causes us to loop sending 0-length segments to the protocol.
|
|
*
|
|
* Also check to make sure that MSG_EOR isn't used on SOCK_STREAM
|
|
* type sockets since that's an error.
|
|
*/
|
|
if (resid < 0 || (so->so_type == SOCK_STREAM && (flags & MSG_EOR))) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
dontroute =
|
|
(flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
|
|
(so->so_proto->pr_flags & PR_ATOMIC);
|
|
if (td != NULL)
|
|
td->td_proc->p_stats->p_ru.ru_msgsnd++;
|
|
if (control != NULL)
|
|
clen = control->m_len;
|
|
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
restart:
|
|
SOCKBUF_LOCK_ASSERT(&so->so_snd);
|
|
error = sblock(&so->so_snd, SBLOCKWAIT(flags));
|
|
if (error)
|
|
goto out_locked;
|
|
do {
|
|
SOCKBUF_LOCK_ASSERT(&so->so_snd);
|
|
if (so->so_snd.sb_state & SBS_CANTSENDMORE)
|
|
snderr(EPIPE);
|
|
if (so->so_error) {
|
|
error = so->so_error;
|
|
so->so_error = 0;
|
|
goto release;
|
|
}
|
|
if ((so->so_state & SS_ISCONNECTED) == 0) {
|
|
/*
|
|
* `sendto' and `sendmsg' is allowed on a connection-
|
|
* based socket if it supports implied connect.
|
|
* Return ENOTCONN if not connected and no address is
|
|
* supplied.
|
|
*/
|
|
if ((so->so_proto->pr_flags & PR_CONNREQUIRED) &&
|
|
(so->so_proto->pr_flags & PR_IMPLOPCL) == 0) {
|
|
if ((so->so_state & SS_ISCONFIRMING) == 0 &&
|
|
!(resid == 0 && clen != 0))
|
|
snderr(ENOTCONN);
|
|
} else if (addr == NULL)
|
|
snderr(so->so_proto->pr_flags & PR_CONNREQUIRED ?
|
|
ENOTCONN : EDESTADDRREQ);
|
|
}
|
|
space = sbspace(&so->so_snd);
|
|
if (flags & MSG_OOB)
|
|
space += 1024;
|
|
if ((atomic && resid > so->so_snd.sb_hiwat) ||
|
|
clen > so->so_snd.sb_hiwat)
|
|
snderr(EMSGSIZE);
|
|
if (space < resid + clen &&
|
|
(atomic || space < so->so_snd.sb_lowat || space < clen)) {
|
|
if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO))
|
|
snderr(EWOULDBLOCK);
|
|
sbunlock(&so->so_snd);
|
|
error = sbwait(&so->so_snd);
|
|
if (error)
|
|
goto out_locked;
|
|
goto restart;
|
|
}
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
space -= clen;
|
|
do {
|
|
if (uio == NULL) {
|
|
resid = 0;
|
|
if (flags & MSG_EOR)
|
|
top->m_flags |= M_EOR;
|
|
} else {
|
|
error = sosend_copyin(uio, &top, atomic,
|
|
&space, flags);
|
|
if (error != 0) {
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
goto release;
|
|
}
|
|
resid = uio->uio_resid;
|
|
}
|
|
if (dontroute) {
|
|
SOCK_LOCK(so);
|
|
so->so_options |= SO_DONTROUTE;
|
|
SOCK_UNLOCK(so);
|
|
}
|
|
/*
|
|
* XXX all the SBS_CANTSENDMORE checks previously
|
|
* done could be out of date. We could have recieved
|
|
* a reset packet in an interrupt or maybe we slept
|
|
* while doing page faults in uiomove() etc. We could
|
|
* probably recheck again inside the locking protection
|
|
* here, but there are probably other places that this
|
|
* also happens. We must rethink this.
|
|
*/
|
|
error = (*so->so_proto->pr_usrreqs->pru_send)(so,
|
|
(flags & MSG_OOB) ? PRUS_OOB :
|
|
/*
|
|
* If the user set MSG_EOF, the protocol
|
|
* understands this flag and nothing left to
|
|
* send then use PRU_SEND_EOF instead of PRU_SEND.
|
|
*/
|
|
((flags & MSG_EOF) &&
|
|
(so->so_proto->pr_flags & PR_IMPLOPCL) &&
|
|
(resid <= 0)) ?
|
|
PRUS_EOF :
|
|
/* If there is more to send set PRUS_MORETOCOME */
|
|
(resid > 0 && space > 0) ? PRUS_MORETOCOME : 0,
|
|
top, addr, control, td);
|
|
if (dontroute) {
|
|
SOCK_LOCK(so);
|
|
so->so_options &= ~SO_DONTROUTE;
|
|
SOCK_UNLOCK(so);
|
|
}
|
|
clen = 0;
|
|
control = NULL;
|
|
top = NULL;
|
|
if (error) {
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
goto release;
|
|
}
|
|
} while (resid && space > 0);
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
} while (resid);
|
|
|
|
release:
|
|
SOCKBUF_LOCK_ASSERT(&so->so_snd);
|
|
sbunlock(&so->so_snd);
|
|
out_locked:
|
|
SOCKBUF_LOCK_ASSERT(&so->so_snd);
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
out:
|
|
if (top != NULL)
|
|
m_freem(top);
|
|
if (control != NULL)
|
|
m_freem(control);
|
|
return (error);
|
|
}
|
|
#undef snderr
|
|
|
|
/*
|
|
* The part of soreceive() that implements reading non-inline out-of-band
|
|
* data from a socket. For more complete comments, see soreceive(), from
|
|
* which this code originated.
|
|
*
|
|
* Note that soreceive_rcvoob(), unlike the remainder of soreceive(), is
|
|
* unable to return an mbuf chain to the caller.
|
|
*/
|
|
static int
|
|
soreceive_rcvoob(so, uio, flags)
|
|
struct socket *so;
|
|
struct uio *uio;
|
|
int flags;
|
|
{
|
|
struct protosw *pr = so->so_proto;
|
|
struct mbuf *m;
|
|
int error;
|
|
|
|
KASSERT(flags & MSG_OOB, ("soreceive_rcvoob: (flags & MSG_OOB) == 0"));
|
|
|
|
m = m_get(M_TRYWAIT, MT_DATA);
|
|
if (m == NULL)
|
|
return (ENOBUFS);
|
|
error = (*pr->pr_usrreqs->pru_rcvoob)(so, m, flags & MSG_PEEK);
|
|
if (error)
|
|
goto bad;
|
|
do {
|
|
#ifdef ZERO_COPY_SOCKETS
|
|
if (so_zero_copy_receive) {
|
|
int disposable;
|
|
|
|
if ((m->m_flags & M_EXT)
|
|
&& (m->m_ext.ext_type == EXT_DISPOSABLE))
|
|
disposable = 1;
|
|
else
|
|
disposable = 0;
|
|
|
|
error = uiomoveco(mtod(m, void *),
|
|
min(uio->uio_resid, m->m_len),
|
|
uio, disposable);
|
|
} else
|
|
#endif /* ZERO_COPY_SOCKETS */
|
|
error = uiomove(mtod(m, void *),
|
|
(int) min(uio->uio_resid, m->m_len), uio);
|
|
m = m_free(m);
|
|
} while (uio->uio_resid && error == 0 && m);
|
|
bad:
|
|
if (m != NULL)
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Following replacement or removal of the first mbuf on the first mbuf chain
|
|
* of a socket buffer, push necessary state changes back into the socket
|
|
* buffer so that other consumers see the values consistently. 'nextrecord'
|
|
* is the callers locally stored value of the original value of
|
|
* sb->sb_mb->m_nextpkt which must be restored when the lead mbuf changes.
|
|
* NOTE: 'nextrecord' may be NULL.
|
|
*/
|
|
static __inline void
|
|
sockbuf_pushsync(struct sockbuf *sb, struct mbuf *nextrecord)
|
|
{
|
|
|
|
SOCKBUF_LOCK_ASSERT(sb);
|
|
/*
|
|
* First, update for the new value of nextrecord. If necessary, make
|
|
* it the first record.
|
|
*/
|
|
if (sb->sb_mb != NULL)
|
|
sb->sb_mb->m_nextpkt = nextrecord;
|
|
else
|
|
sb->sb_mb = nextrecord;
|
|
|
|
/*
|
|
* Now update any dependent socket buffer fields to reflect the new
|
|
* state. This is an expanded inline of SB_EMPTY_FIXUP(), with the
|
|
* addition of a second clause that takes care of the case where
|
|
* sb_mb has been updated, but remains the last record.
|
|
*/
|
|
if (sb->sb_mb == NULL) {
|
|
sb->sb_mbtail = NULL;
|
|
sb->sb_lastrecord = NULL;
|
|
} else if (sb->sb_mb->m_nextpkt == NULL)
|
|
sb->sb_lastrecord = sb->sb_mb;
|
|
}
|
|
|
|
|
|
/*
|
|
* Implement receive operations on a socket.
|
|
* We depend on the way that records are added to the sockbuf
|
|
* by sbappend*. In particular, each record (mbufs linked through m_next)
|
|
* must begin with an address if the protocol so specifies,
|
|
* followed by an optional mbuf or mbufs containing ancillary data,
|
|
* and then zero or more mbufs of data.
|
|
* In order to avoid blocking network interrupts for the entire time here,
|
|
* we splx() while doing the actual copy to user space.
|
|
* Although the sockbuf is locked, new data may still be appended,
|
|
* and thus we must maintain consistency of the sockbuf during that time.
|
|
*
|
|
* The caller may receive the data as a single mbuf chain by supplying
|
|
* an mbuf **mp0 for use in returning the chain. The uio is then used
|
|
* only for the count in uio_resid.
|
|
*/
|
|
int
|
|
soreceive(so, psa, uio, mp0, controlp, flagsp)
|
|
struct socket *so;
|
|
struct sockaddr **psa;
|
|
struct uio *uio;
|
|
struct mbuf **mp0;
|
|
struct mbuf **controlp;
|
|
int *flagsp;
|
|
{
|
|
struct mbuf *m, **mp;
|
|
int flags, len, error, offset;
|
|
struct protosw *pr = so->so_proto;
|
|
struct mbuf *nextrecord;
|
|
int moff, type = 0;
|
|
int orig_resid = uio->uio_resid;
|
|
|
|
mp = mp0;
|
|
if (psa != NULL)
|
|
*psa = NULL;
|
|
if (controlp != NULL)
|
|
*controlp = NULL;
|
|
if (flagsp != NULL)
|
|
flags = *flagsp &~ MSG_EOR;
|
|
else
|
|
flags = 0;
|
|
if (flags & MSG_OOB)
|
|
return (soreceive_rcvoob(so, uio, flags));
|
|
if (mp != NULL)
|
|
*mp = NULL;
|
|
if ((pr->pr_flags & PR_WANTRCVD) && (so->so_state & SS_ISCONFIRMING)
|
|
&& uio->uio_resid)
|
|
(*pr->pr_usrreqs->pru_rcvd)(so, 0);
|
|
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
restart:
|
|
SOCKBUF_LOCK_ASSERT(&so->so_rcv);
|
|
error = sblock(&so->so_rcv, SBLOCKWAIT(flags));
|
|
if (error)
|
|
goto out;
|
|
|
|
m = so->so_rcv.sb_mb;
|
|
/*
|
|
* If we have less data than requested, block awaiting more
|
|
* (subject to any timeout) if:
|
|
* 1. the current count is less than the low water mark, or
|
|
* 2. MSG_WAITALL is set, and it is possible to do the entire
|
|
* receive operation at once if we block (resid <= hiwat).
|
|
* 3. MSG_DONTWAIT is not set
|
|
* If MSG_WAITALL is set but resid is larger than the receive buffer,
|
|
* we have to do the receive in sections, and thus risk returning
|
|
* a short count if a timeout or signal occurs after we start.
|
|
*/
|
|
if (m == NULL || (((flags & MSG_DONTWAIT) == 0 &&
|
|
so->so_rcv.sb_cc < uio->uio_resid) &&
|
|
(so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
|
|
((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
|
|
m->m_nextpkt == NULL && (pr->pr_flags & PR_ATOMIC) == 0)) {
|
|
KASSERT(m != NULL || !so->so_rcv.sb_cc,
|
|
("receive: m == %p so->so_rcv.sb_cc == %u",
|
|
m, so->so_rcv.sb_cc));
|
|
if (so->so_error) {
|
|
if (m != NULL)
|
|
goto dontblock;
|
|
error = so->so_error;
|
|
if ((flags & MSG_PEEK) == 0)
|
|
so->so_error = 0;
|
|
goto release;
|
|
}
|
|
SOCKBUF_LOCK_ASSERT(&so->so_rcv);
|
|
if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
|
|
if (m)
|
|
goto dontblock;
|
|
else
|
|
goto release;
|
|
}
|
|
for (; m != NULL; m = m->m_next)
|
|
if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) {
|
|
m = so->so_rcv.sb_mb;
|
|
goto dontblock;
|
|
}
|
|
if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
|
|
(so->so_proto->pr_flags & PR_CONNREQUIRED)) {
|
|
error = ENOTCONN;
|
|
goto release;
|
|
}
|
|
if (uio->uio_resid == 0)
|
|
goto release;
|
|
if ((so->so_state & SS_NBIO) ||
|
|
(flags & (MSG_DONTWAIT|MSG_NBIO))) {
|
|
error = EWOULDBLOCK;
|
|
goto release;
|
|
}
|
|
SBLASTRECORDCHK(&so->so_rcv);
|
|
SBLASTMBUFCHK(&so->so_rcv);
|
|
sbunlock(&so->so_rcv);
|
|
error = sbwait(&so->so_rcv);
|
|
if (error)
|
|
goto out;
|
|
goto restart;
|
|
}
|
|
dontblock:
|
|
/*
|
|
* From this point onward, we maintain 'nextrecord' as a cache of the
|
|
* pointer to the next record in the socket buffer. We must keep the
|
|
* various socket buffer pointers and local stack versions of the
|
|
* pointers in sync, pushing out modifications before dropping the
|
|
* socket buffer mutex, and re-reading them when picking it up.
|
|
*
|
|
* Otherwise, we will race with the network stack appending new data
|
|
* or records onto the socket buffer by using inconsistent/stale
|
|
* versions of the field, possibly resulting in socket buffer
|
|
* corruption.
|
|
*
|
|
* By holding the high-level sblock(), we prevent simultaneous
|
|
* readers from pulling off the front of the socket buffer.
|
|
*/
|
|
SOCKBUF_LOCK_ASSERT(&so->so_rcv);
|
|
if (uio->uio_td)
|
|
uio->uio_td->td_proc->p_stats->p_ru.ru_msgrcv++;
|
|
KASSERT(m == so->so_rcv.sb_mb, ("soreceive: m != so->so_rcv.sb_mb"));
|
|
SBLASTRECORDCHK(&so->so_rcv);
|
|
SBLASTMBUFCHK(&so->so_rcv);
|
|
nextrecord = m->m_nextpkt;
|
|
if (pr->pr_flags & PR_ADDR) {
|
|
KASSERT(m->m_type == MT_SONAME,
|
|
("m->m_type == %d", m->m_type));
|
|
orig_resid = 0;
|
|
if (psa != NULL)
|
|
*psa = sodupsockaddr(mtod(m, struct sockaddr *),
|
|
M_NOWAIT);
|
|
if (flags & MSG_PEEK) {
|
|
m = m->m_next;
|
|
} else {
|
|
sbfree(&so->so_rcv, m);
|
|
so->so_rcv.sb_mb = m_free(m);
|
|
m = so->so_rcv.sb_mb;
|
|
sockbuf_pushsync(&so->so_rcv, nextrecord);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Process one or more MT_CONTROL mbufs present before any data mbufs
|
|
* in the first mbuf chain on the socket buffer. If MSG_PEEK, we
|
|
* just copy the data; if !MSG_PEEK, we call into the protocol to
|
|
* perform externalization (or freeing if controlp == NULL).
|
|
*/
|
|
if (m != NULL && m->m_type == MT_CONTROL) {
|
|
struct mbuf *cm = NULL, *cmn;
|
|
struct mbuf **cme = &cm;
|
|
|
|
do {
|
|
if (flags & MSG_PEEK) {
|
|
if (controlp != NULL) {
|
|
*controlp = m_copy(m, 0, m->m_len);
|
|
controlp = &(*controlp)->m_next;
|
|
}
|
|
m = m->m_next;
|
|
} else {
|
|
sbfree(&so->so_rcv, m);
|
|
so->so_rcv.sb_mb = m->m_next;
|
|
m->m_next = NULL;
|
|
*cme = m;
|
|
cme = &(*cme)->m_next;
|
|
m = so->so_rcv.sb_mb;
|
|
}
|
|
} while (m != NULL && m->m_type == MT_CONTROL);
|
|
if ((flags & MSG_PEEK) == 0)
|
|
sockbuf_pushsync(&so->so_rcv, nextrecord);
|
|
while (cm != NULL) {
|
|
cmn = cm->m_next;
|
|
cm->m_next = NULL;
|
|
if (pr->pr_domain->dom_externalize != NULL) {
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
error = (*pr->pr_domain->dom_externalize)
|
|
(cm, controlp);
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
} else if (controlp != NULL)
|
|
*controlp = cm;
|
|
else
|
|
m_freem(cm);
|
|
if (controlp != NULL) {
|
|
orig_resid = 0;
|
|
while (*controlp != NULL)
|
|
controlp = &(*controlp)->m_next;
|
|
}
|
|
cm = cmn;
|
|
}
|
|
if (so->so_rcv.sb_mb)
|
|
nextrecord = so->so_rcv.sb_mb->m_nextpkt;
|
|
else
|
|
nextrecord = NULL;
|
|
orig_resid = 0;
|
|
}
|
|
if (m != NULL) {
|
|
if ((flags & MSG_PEEK) == 0) {
|
|
KASSERT(m->m_nextpkt == nextrecord,
|
|
("soreceive: post-control, nextrecord !sync"));
|
|
if (nextrecord == NULL) {
|
|
KASSERT(so->so_rcv.sb_mb == m,
|
|
("soreceive: post-control, sb_mb!=m"));
|
|
KASSERT(so->so_rcv.sb_lastrecord == m,
|
|
("soreceive: post-control, lastrecord!=m"));
|
|
}
|
|
}
|
|
type = m->m_type;
|
|
if (type == MT_OOBDATA)
|
|
flags |= MSG_OOB;
|
|
} else {
|
|
if ((flags & MSG_PEEK) == 0) {
|
|
KASSERT(so->so_rcv.sb_mb == nextrecord,
|
|
("soreceive: sb_mb != nextrecord"));
|
|
if (so->so_rcv.sb_mb == NULL) {
|
|
KASSERT(so->so_rcv.sb_lastrecord == NULL,
|
|
("soreceive: sb_lastercord != NULL"));
|
|
}
|
|
}
|
|
}
|
|
SOCKBUF_LOCK_ASSERT(&so->so_rcv);
|
|
SBLASTRECORDCHK(&so->so_rcv);
|
|
SBLASTMBUFCHK(&so->so_rcv);
|
|
|
|
/*
|
|
* Now continue to read any data mbufs off of the head of the socket
|
|
* buffer until the read request is satisfied. Note that 'type' is
|
|
* used to store the type of any mbuf reads that have happened so far
|
|
* such that soreceive() can stop reading if the type changes, which
|
|
* causes soreceive() to return only one of regular data and inline
|
|
* out-of-band data in a single socket receive operation.
|
|
*/
|
|
moff = 0;
|
|
offset = 0;
|
|
while (m != NULL && uio->uio_resid > 0 && error == 0) {
|
|
/*
|
|
* If the type of mbuf has changed since the last mbuf
|
|
* examined ('type'), end the receive operation.
|
|
*/
|
|
SOCKBUF_LOCK_ASSERT(&so->so_rcv);
|
|
if (m->m_type == MT_OOBDATA) {
|
|
if (type != MT_OOBDATA)
|
|
break;
|
|
} else if (type == MT_OOBDATA)
|
|
break;
|
|
else
|
|
KASSERT(m->m_type == MT_DATA,
|
|
("m->m_type == %d", m->m_type));
|
|
so->so_rcv.sb_state &= ~SBS_RCVATMARK;
|
|
len = uio->uio_resid;
|
|
if (so->so_oobmark && len > so->so_oobmark - offset)
|
|
len = so->so_oobmark - offset;
|
|
if (len > m->m_len - moff)
|
|
len = m->m_len - moff;
|
|
/*
|
|
* If mp is set, just pass back the mbufs.
|
|
* Otherwise copy them out via the uio, then free.
|
|
* Sockbuf must be consistent here (points to current mbuf,
|
|
* it points to next record) when we drop priority;
|
|
* we must note any additions to the sockbuf when we
|
|
* block interrupts again.
|
|
*/
|
|
if (mp == NULL) {
|
|
SOCKBUF_LOCK_ASSERT(&so->so_rcv);
|
|
SBLASTRECORDCHK(&so->so_rcv);
|
|
SBLASTMBUFCHK(&so->so_rcv);
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
#ifdef ZERO_COPY_SOCKETS
|
|
if (so_zero_copy_receive) {
|
|
int disposable;
|
|
|
|
if ((m->m_flags & M_EXT)
|
|
&& (m->m_ext.ext_type == EXT_DISPOSABLE))
|
|
disposable = 1;
|
|
else
|
|
disposable = 0;
|
|
|
|
error = uiomoveco(mtod(m, char *) + moff,
|
|
(int)len, uio,
|
|
disposable);
|
|
} else
|
|
#endif /* ZERO_COPY_SOCKETS */
|
|
error = uiomove(mtod(m, char *) + moff, (int)len, uio);
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
if (error)
|
|
goto release;
|
|
} else
|
|
uio->uio_resid -= len;
|
|
SOCKBUF_LOCK_ASSERT(&so->so_rcv);
|
|
if (len == m->m_len - moff) {
|
|
if (m->m_flags & M_EOR)
|
|
flags |= MSG_EOR;
|
|
if (flags & MSG_PEEK) {
|
|
m = m->m_next;
|
|
moff = 0;
|
|
} else {
|
|
nextrecord = m->m_nextpkt;
|
|
sbfree(&so->so_rcv, m);
|
|
if (mp != NULL) {
|
|
*mp = m;
|
|
mp = &m->m_next;
|
|
so->so_rcv.sb_mb = m = m->m_next;
|
|
*mp = NULL;
|
|
} else {
|
|
so->so_rcv.sb_mb = m_free(m);
|
|
m = so->so_rcv.sb_mb;
|
|
}
|
|
sockbuf_pushsync(&so->so_rcv, nextrecord);
|
|
SBLASTRECORDCHK(&so->so_rcv);
|
|
SBLASTMBUFCHK(&so->so_rcv);
|
|
}
|
|
} else {
|
|
if (flags & MSG_PEEK)
|
|
moff += len;
|
|
else {
|
|
if (mp != NULL) {
|
|
int copy_flag;
|
|
|
|
if (flags & MSG_DONTWAIT)
|
|
copy_flag = M_DONTWAIT;
|
|
else
|
|
copy_flag = M_TRYWAIT;
|
|
if (copy_flag == M_TRYWAIT)
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
*mp = m_copym(m, 0, len, copy_flag);
|
|
if (copy_flag == M_TRYWAIT)
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
if (*mp == NULL) {
|
|
/*
|
|
* m_copym() couldn't allocate an mbuf.
|
|
* Adjust uio_resid back (it was adjusted
|
|
* down by len bytes, which we didn't end
|
|
* up "copying" over).
|
|
*/
|
|
uio->uio_resid += len;
|
|
break;
|
|
}
|
|
}
|
|
m->m_data += len;
|
|
m->m_len -= len;
|
|
so->so_rcv.sb_cc -= len;
|
|
}
|
|
}
|
|
SOCKBUF_LOCK_ASSERT(&so->so_rcv);
|
|
if (so->so_oobmark) {
|
|
if ((flags & MSG_PEEK) == 0) {
|
|
so->so_oobmark -= len;
|
|
if (so->so_oobmark == 0) {
|
|
so->so_rcv.sb_state |= SBS_RCVATMARK;
|
|
break;
|
|
}
|
|
} else {
|
|
offset += len;
|
|
if (offset == so->so_oobmark)
|
|
break;
|
|
}
|
|
}
|
|
if (flags & MSG_EOR)
|
|
break;
|
|
/*
|
|
* If the MSG_WAITALL flag is set (for non-atomic socket),
|
|
* we must not quit until "uio->uio_resid == 0" or an error
|
|
* termination. If a signal/timeout occurs, return
|
|
* with a short count but without error.
|
|
* Keep sockbuf locked against other readers.
|
|
*/
|
|
while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
|
|
!sosendallatonce(so) && nextrecord == NULL) {
|
|
SOCKBUF_LOCK_ASSERT(&so->so_rcv);
|
|
if (so->so_error || so->so_rcv.sb_state & SBS_CANTRCVMORE)
|
|
break;
|
|
/*
|
|
* Notify the protocol that some data has been
|
|
* drained before blocking.
|
|
*/
|
|
if (pr->pr_flags & PR_WANTRCVD && so->so_pcb != NULL) {
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
(*pr->pr_usrreqs->pru_rcvd)(so, flags);
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
}
|
|
SBLASTRECORDCHK(&so->so_rcv);
|
|
SBLASTMBUFCHK(&so->so_rcv);
|
|
error = sbwait(&so->so_rcv);
|
|
if (error)
|
|
goto release;
|
|
m = so->so_rcv.sb_mb;
|
|
if (m != NULL)
|
|
nextrecord = m->m_nextpkt;
|
|
}
|
|
}
|
|
|
|
SOCKBUF_LOCK_ASSERT(&so->so_rcv);
|
|
if (m != NULL && pr->pr_flags & PR_ATOMIC) {
|
|
flags |= MSG_TRUNC;
|
|
if ((flags & MSG_PEEK) == 0)
|
|
(void) sbdroprecord_locked(&so->so_rcv);
|
|
}
|
|
if ((flags & MSG_PEEK) == 0) {
|
|
if (m == NULL) {
|
|
/*
|
|
* First part is an inline SB_EMPTY_FIXUP(). Second
|
|
* part makes sure sb_lastrecord is up-to-date if
|
|
* there is still data in the socket buffer.
|
|
*/
|
|
so->so_rcv.sb_mb = nextrecord;
|
|
if (so->so_rcv.sb_mb == NULL) {
|
|
so->so_rcv.sb_mbtail = NULL;
|
|
so->so_rcv.sb_lastrecord = NULL;
|
|
} else if (nextrecord->m_nextpkt == NULL)
|
|
so->so_rcv.sb_lastrecord = nextrecord;
|
|
}
|
|
SBLASTRECORDCHK(&so->so_rcv);
|
|
SBLASTMBUFCHK(&so->so_rcv);
|
|
/*
|
|
* If soreceive() is being done from the socket callback, then
|
|
* don't need to generate ACK to peer to update window, since
|
|
* ACK will be generated on return to TCP.
|
|
*/
|
|
if (!(flags & MSG_SOCALLBCK) &&
|
|
(pr->pr_flags & PR_WANTRCVD) && so->so_pcb) {
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
(*pr->pr_usrreqs->pru_rcvd)(so, flags);
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
}
|
|
}
|
|
SOCKBUF_LOCK_ASSERT(&so->so_rcv);
|
|
if (orig_resid == uio->uio_resid && orig_resid &&
|
|
(flags & MSG_EOR) == 0 && (so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0) {
|
|
sbunlock(&so->so_rcv);
|
|
goto restart;
|
|
}
|
|
|
|
if (flagsp != NULL)
|
|
*flagsp |= flags;
|
|
release:
|
|
SOCKBUF_LOCK_ASSERT(&so->so_rcv);
|
|
sbunlock(&so->so_rcv);
|
|
out:
|
|
SOCKBUF_LOCK_ASSERT(&so->so_rcv);
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
soshutdown(so, how)
|
|
struct socket *so;
|
|
int how;
|
|
{
|
|
struct protosw *pr = so->so_proto;
|
|
|
|
if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
|
|
return (EINVAL);
|
|
|
|
if (how != SHUT_WR)
|
|
sorflush(so);
|
|
if (how != SHUT_RD)
|
|
return ((*pr->pr_usrreqs->pru_shutdown)(so));
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
sorflush(so)
|
|
struct socket *so;
|
|
{
|
|
struct sockbuf *sb = &so->so_rcv;
|
|
struct protosw *pr = so->so_proto;
|
|
struct sockbuf asb;
|
|
|
|
/*
|
|
* XXXRW: This is quite ugly. Previously, this code made a copy of
|
|
* the socket buffer, then zero'd the original to clear the buffer
|
|
* fields. However, with mutexes in the socket buffer, this causes
|
|
* problems. We only clear the zeroable bits of the original;
|
|
* however, we have to initialize and destroy the mutex in the copy
|
|
* so that dom_dispose() and sbrelease() can lock t as needed.
|
|
*/
|
|
SOCKBUF_LOCK(sb);
|
|
sb->sb_flags |= SB_NOINTR;
|
|
(void) sblock(sb, M_WAITOK);
|
|
/*
|
|
* socantrcvmore_locked() drops the socket buffer mutex so that it
|
|
* can safely perform wakeups. Re-acquire the mutex before
|
|
* continuing.
|
|
*/
|
|
socantrcvmore_locked(so);
|
|
SOCKBUF_LOCK(sb);
|
|
sbunlock(sb);
|
|
/*
|
|
* Invalidate/clear most of the sockbuf structure, but leave
|
|
* selinfo and mutex data unchanged.
|
|
*/
|
|
bzero(&asb, offsetof(struct sockbuf, sb_startzero));
|
|
bcopy(&sb->sb_startzero, &asb.sb_startzero,
|
|
sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
|
|
bzero(&sb->sb_startzero,
|
|
sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
|
|
SOCKBUF_UNLOCK(sb);
|
|
|
|
SOCKBUF_LOCK_INIT(&asb, "so_rcv");
|
|
if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose != NULL)
|
|
(*pr->pr_domain->dom_dispose)(asb.sb_mb);
|
|
sbrelease(&asb, so);
|
|
SOCKBUF_LOCK_DESTROY(&asb);
|
|
}
|
|
|
|
/*
|
|
* Perhaps this routine, and sooptcopyout(), below, ought to come in
|
|
* an additional variant to handle the case where the option value needs
|
|
* to be some kind of integer, but not a specific size.
|
|
* In addition to their use here, these functions are also called by the
|
|
* protocol-level pr_ctloutput() routines.
|
|
*/
|
|
int
|
|
sooptcopyin(sopt, buf, len, minlen)
|
|
struct sockopt *sopt;
|
|
void *buf;
|
|
size_t len;
|
|
size_t minlen;
|
|
{
|
|
size_t valsize;
|
|
|
|
/*
|
|
* If the user gives us more than we wanted, we ignore it,
|
|
* but if we don't get the minimum length the caller
|
|
* wants, we return EINVAL. On success, sopt->sopt_valsize
|
|
* is set to however much we actually retrieved.
|
|
*/
|
|
if ((valsize = sopt->sopt_valsize) < minlen)
|
|
return EINVAL;
|
|
if (valsize > len)
|
|
sopt->sopt_valsize = valsize = len;
|
|
|
|
if (sopt->sopt_td != NULL)
|
|
return (copyin(sopt->sopt_val, buf, valsize));
|
|
|
|
bcopy(sopt->sopt_val, buf, valsize);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Kernel version of setsockopt(2)/
|
|
* XXX: optlen is size_t, not socklen_t
|
|
*/
|
|
int
|
|
so_setsockopt(struct socket *so, int level, int optname, void *optval,
|
|
size_t optlen)
|
|
{
|
|
struct sockopt sopt;
|
|
|
|
sopt.sopt_level = level;
|
|
sopt.sopt_name = optname;
|
|
sopt.sopt_dir = SOPT_SET;
|
|
sopt.sopt_val = optval;
|
|
sopt.sopt_valsize = optlen;
|
|
sopt.sopt_td = NULL;
|
|
return (sosetopt(so, &sopt));
|
|
}
|
|
|
|
int
|
|
sosetopt(so, sopt)
|
|
struct socket *so;
|
|
struct sockopt *sopt;
|
|
{
|
|
int error, optval;
|
|
struct linger l;
|
|
struct timeval tv;
|
|
u_long val;
|
|
#ifdef MAC
|
|
struct mac extmac;
|
|
#endif
|
|
|
|
error = 0;
|
|
if (sopt->sopt_level != SOL_SOCKET) {
|
|
if (so->so_proto && so->so_proto->pr_ctloutput)
|
|
return ((*so->so_proto->pr_ctloutput)
|
|
(so, sopt));
|
|
error = ENOPROTOOPT;
|
|
} else {
|
|
switch (sopt->sopt_name) {
|
|
#ifdef INET
|
|
case SO_ACCEPTFILTER:
|
|
error = do_setopt_accept_filter(so, sopt);
|
|
if (error)
|
|
goto bad;
|
|
break;
|
|
#endif
|
|
case SO_LINGER:
|
|
error = sooptcopyin(sopt, &l, sizeof l, sizeof l);
|
|
if (error)
|
|
goto bad;
|
|
|
|
SOCK_LOCK(so);
|
|
so->so_linger = l.l_linger;
|
|
if (l.l_onoff)
|
|
so->so_options |= SO_LINGER;
|
|
else
|
|
so->so_options &= ~SO_LINGER;
|
|
SOCK_UNLOCK(so);
|
|
break;
|
|
|
|
case SO_DEBUG:
|
|
case SO_KEEPALIVE:
|
|
case SO_DONTROUTE:
|
|
case SO_USELOOPBACK:
|
|
case SO_BROADCAST:
|
|
case SO_REUSEADDR:
|
|
case SO_REUSEPORT:
|
|
case SO_OOBINLINE:
|
|
case SO_TIMESTAMP:
|
|
case SO_BINTIME:
|
|
case SO_NOSIGPIPE:
|
|
error = sooptcopyin(sopt, &optval, sizeof optval,
|
|
sizeof optval);
|
|
if (error)
|
|
goto bad;
|
|
SOCK_LOCK(so);
|
|
if (optval)
|
|
so->so_options |= sopt->sopt_name;
|
|
else
|
|
so->so_options &= ~sopt->sopt_name;
|
|
SOCK_UNLOCK(so);
|
|
break;
|
|
|
|
case SO_SNDBUF:
|
|
case SO_RCVBUF:
|
|
case SO_SNDLOWAT:
|
|
case SO_RCVLOWAT:
|
|
error = sooptcopyin(sopt, &optval, sizeof optval,
|
|
sizeof optval);
|
|
if (error)
|
|
goto bad;
|
|
|
|
/*
|
|
* Values < 1 make no sense for any of these
|
|
* options, so disallow them.
|
|
*/
|
|
if (optval < 1) {
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
|
|
switch (sopt->sopt_name) {
|
|
case SO_SNDBUF:
|
|
case SO_RCVBUF:
|
|
if (sbreserve(sopt->sopt_name == SO_SNDBUF ?
|
|
&so->so_snd : &so->so_rcv, (u_long)optval,
|
|
so, curthread) == 0) {
|
|
error = ENOBUFS;
|
|
goto bad;
|
|
}
|
|
break;
|
|
|
|
/*
|
|
* Make sure the low-water is never greater than
|
|
* the high-water.
|
|
*/
|
|
case SO_SNDLOWAT:
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
so->so_snd.sb_lowat =
|
|
(optval > so->so_snd.sb_hiwat) ?
|
|
so->so_snd.sb_hiwat : optval;
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
break;
|
|
case SO_RCVLOWAT:
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
so->so_rcv.sb_lowat =
|
|
(optval > so->so_rcv.sb_hiwat) ?
|
|
so->so_rcv.sb_hiwat : optval;
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case SO_SNDTIMEO:
|
|
case SO_RCVTIMEO:
|
|
#ifdef COMPAT_IA32
|
|
if (curthread->td_proc->p_sysent == &ia32_freebsd_sysvec) {
|
|
struct timeval32 tv32;
|
|
|
|
error = sooptcopyin(sopt, &tv32, sizeof tv32,
|
|
sizeof tv32);
|
|
CP(tv32, tv, tv_sec);
|
|
CP(tv32, tv, tv_usec);
|
|
} else
|
|
#endif
|
|
error = sooptcopyin(sopt, &tv, sizeof tv,
|
|
sizeof tv);
|
|
if (error)
|
|
goto bad;
|
|
|
|
/* assert(hz > 0); */
|
|
if (tv.tv_sec < 0 || tv.tv_sec > INT_MAX / hz ||
|
|
tv.tv_usec < 0 || tv.tv_usec >= 1000000) {
|
|
error = EDOM;
|
|
goto bad;
|
|
}
|
|
/* assert(tick > 0); */
|
|
/* assert(ULONG_MAX - INT_MAX >= 1000000); */
|
|
val = (u_long)(tv.tv_sec * hz) + tv.tv_usec / tick;
|
|
if (val > INT_MAX) {
|
|
error = EDOM;
|
|
goto bad;
|
|
}
|
|
if (val == 0 && tv.tv_usec != 0)
|
|
val = 1;
|
|
|
|
switch (sopt->sopt_name) {
|
|
case SO_SNDTIMEO:
|
|
so->so_snd.sb_timeo = val;
|
|
break;
|
|
case SO_RCVTIMEO:
|
|
so->so_rcv.sb_timeo = val;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case SO_LABEL:
|
|
#ifdef MAC
|
|
error = sooptcopyin(sopt, &extmac, sizeof extmac,
|
|
sizeof extmac);
|
|
if (error)
|
|
goto bad;
|
|
error = mac_setsockopt_label(sopt->sopt_td->td_ucred,
|
|
so, &extmac);
|
|
#else
|
|
error = EOPNOTSUPP;
|
|
#endif
|
|
break;
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
if (error == 0 && so->so_proto != NULL &&
|
|
so->so_proto->pr_ctloutput != NULL) {
|
|
(void) ((*so->so_proto->pr_ctloutput)
|
|
(so, sopt));
|
|
}
|
|
}
|
|
bad:
|
|
return (error);
|
|
}
|
|
|
|
/* Helper routine for getsockopt */
|
|
int
|
|
sooptcopyout(struct sockopt *sopt, const void *buf, size_t len)
|
|
{
|
|
int error;
|
|
size_t valsize;
|
|
|
|
error = 0;
|
|
|
|
/*
|
|
* Documented get behavior is that we always return a value,
|
|
* possibly truncated to fit in the user's buffer.
|
|
* Traditional behavior is that we always tell the user
|
|
* precisely how much we copied, rather than something useful
|
|
* like the total amount we had available for her.
|
|
* Note that this interface is not idempotent; the entire answer must
|
|
* generated ahead of time.
|
|
*/
|
|
valsize = min(len, sopt->sopt_valsize);
|
|
sopt->sopt_valsize = valsize;
|
|
if (sopt->sopt_val != NULL) {
|
|
if (sopt->sopt_td != NULL)
|
|
error = copyout(buf, sopt->sopt_val, valsize);
|
|
else
|
|
bcopy(buf, sopt->sopt_val, valsize);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
int
|
|
sogetopt(so, sopt)
|
|
struct socket *so;
|
|
struct sockopt *sopt;
|
|
{
|
|
int error, optval;
|
|
struct linger l;
|
|
struct timeval tv;
|
|
#ifdef MAC
|
|
struct mac extmac;
|
|
#endif
|
|
|
|
error = 0;
|
|
if (sopt->sopt_level != SOL_SOCKET) {
|
|
if (so->so_proto && so->so_proto->pr_ctloutput) {
|
|
return ((*so->so_proto->pr_ctloutput)
|
|
(so, sopt));
|
|
} else
|
|
return (ENOPROTOOPT);
|
|
} else {
|
|
switch (sopt->sopt_name) {
|
|
#ifdef INET
|
|
case SO_ACCEPTFILTER:
|
|
error = do_getopt_accept_filter(so, sopt);
|
|
break;
|
|
#endif
|
|
case SO_LINGER:
|
|
SOCK_LOCK(so);
|
|
l.l_onoff = so->so_options & SO_LINGER;
|
|
l.l_linger = so->so_linger;
|
|
SOCK_UNLOCK(so);
|
|
error = sooptcopyout(sopt, &l, sizeof l);
|
|
break;
|
|
|
|
case SO_USELOOPBACK:
|
|
case SO_DONTROUTE:
|
|
case SO_DEBUG:
|
|
case SO_KEEPALIVE:
|
|
case SO_REUSEADDR:
|
|
case SO_REUSEPORT:
|
|
case SO_BROADCAST:
|
|
case SO_OOBINLINE:
|
|
case SO_ACCEPTCONN:
|
|
case SO_TIMESTAMP:
|
|
case SO_BINTIME:
|
|
case SO_NOSIGPIPE:
|
|
optval = so->so_options & sopt->sopt_name;
|
|
integer:
|
|
error = sooptcopyout(sopt, &optval, sizeof optval);
|
|
break;
|
|
|
|
case SO_TYPE:
|
|
optval = so->so_type;
|
|
goto integer;
|
|
|
|
case SO_ERROR:
|
|
optval = so->so_error;
|
|
so->so_error = 0;
|
|
goto integer;
|
|
|
|
case SO_SNDBUF:
|
|
optval = so->so_snd.sb_hiwat;
|
|
goto integer;
|
|
|
|
case SO_RCVBUF:
|
|
optval = so->so_rcv.sb_hiwat;
|
|
goto integer;
|
|
|
|
case SO_SNDLOWAT:
|
|
optval = so->so_snd.sb_lowat;
|
|
goto integer;
|
|
|
|
case SO_RCVLOWAT:
|
|
optval = so->so_rcv.sb_lowat;
|
|
goto integer;
|
|
|
|
case SO_SNDTIMEO:
|
|
case SO_RCVTIMEO:
|
|
optval = (sopt->sopt_name == SO_SNDTIMEO ?
|
|
so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
|
|
|
|
tv.tv_sec = optval / hz;
|
|
tv.tv_usec = (optval % hz) * tick;
|
|
#ifdef COMPAT_IA32
|
|
if (curthread->td_proc->p_sysent == &ia32_freebsd_sysvec) {
|
|
struct timeval32 tv32;
|
|
|
|
CP(tv, tv32, tv_sec);
|
|
CP(tv, tv32, tv_usec);
|
|
error = sooptcopyout(sopt, &tv32, sizeof tv32);
|
|
} else
|
|
#endif
|
|
error = sooptcopyout(sopt, &tv, sizeof tv);
|
|
break;
|
|
|
|
case SO_LABEL:
|
|
#ifdef MAC
|
|
error = sooptcopyin(sopt, &extmac, sizeof(extmac),
|
|
sizeof(extmac));
|
|
if (error)
|
|
return (error);
|
|
error = mac_getsockopt_label(sopt->sopt_td->td_ucred,
|
|
so, &extmac);
|
|
if (error)
|
|
return (error);
|
|
error = sooptcopyout(sopt, &extmac, sizeof extmac);
|
|
#else
|
|
error = EOPNOTSUPP;
|
|
#endif
|
|
break;
|
|
|
|
case SO_PEERLABEL:
|
|
#ifdef MAC
|
|
error = sooptcopyin(sopt, &extmac, sizeof(extmac),
|
|
sizeof(extmac));
|
|
if (error)
|
|
return (error);
|
|
error = mac_getsockopt_peerlabel(
|
|
sopt->sopt_td->td_ucred, so, &extmac);
|
|
if (error)
|
|
return (error);
|
|
error = sooptcopyout(sopt, &extmac, sizeof extmac);
|
|
#else
|
|
error = EOPNOTSUPP;
|
|
#endif
|
|
break;
|
|
|
|
case SO_LISTENQLIMIT:
|
|
optval = so->so_qlimit;
|
|
goto integer;
|
|
|
|
case SO_LISTENQLEN:
|
|
optval = so->so_qlen;
|
|
goto integer;
|
|
|
|
case SO_LISTENINCQLEN:
|
|
optval = so->so_incqlen;
|
|
goto integer;
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
/* XXX; prepare mbuf for (__FreeBSD__ < 3) routines. */
|
|
int
|
|
soopt_getm(struct sockopt *sopt, struct mbuf **mp)
|
|
{
|
|
struct mbuf *m, *m_prev;
|
|
int sopt_size = sopt->sopt_valsize;
|
|
|
|
MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_DATA);
|
|
if (m == NULL)
|
|
return ENOBUFS;
|
|
if (sopt_size > MLEN) {
|
|
MCLGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT);
|
|
if ((m->m_flags & M_EXT) == 0) {
|
|
m_free(m);
|
|
return ENOBUFS;
|
|
}
|
|
m->m_len = min(MCLBYTES, sopt_size);
|
|
} else {
|
|
m->m_len = min(MLEN, sopt_size);
|
|
}
|
|
sopt_size -= m->m_len;
|
|
*mp = m;
|
|
m_prev = m;
|
|
|
|
while (sopt_size) {
|
|
MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_DATA);
|
|
if (m == NULL) {
|
|
m_freem(*mp);
|
|
return ENOBUFS;
|
|
}
|
|
if (sopt_size > MLEN) {
|
|
MCLGET(m, sopt->sopt_td != NULL ? M_TRYWAIT :
|
|
M_DONTWAIT);
|
|
if ((m->m_flags & M_EXT) == 0) {
|
|
m_freem(m);
|
|
m_freem(*mp);
|
|
return ENOBUFS;
|
|
}
|
|
m->m_len = min(MCLBYTES, sopt_size);
|
|
} else {
|
|
m->m_len = min(MLEN, sopt_size);
|
|
}
|
|
sopt_size -= m->m_len;
|
|
m_prev->m_next = m;
|
|
m_prev = m;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* XXX; copyin sopt data into mbuf chain for (__FreeBSD__ < 3) routines. */
|
|
int
|
|
soopt_mcopyin(struct sockopt *sopt, struct mbuf *m)
|
|
{
|
|
struct mbuf *m0 = m;
|
|
|
|
if (sopt->sopt_val == NULL)
|
|
return 0;
|
|
while (m != NULL && sopt->sopt_valsize >= m->m_len) {
|
|
if (sopt->sopt_td != NULL) {
|
|
int error;
|
|
|
|
error = copyin(sopt->sopt_val, mtod(m, char *),
|
|
m->m_len);
|
|
if (error != 0) {
|
|
m_freem(m0);
|
|
return(error);
|
|
}
|
|
} else
|
|
bcopy(sopt->sopt_val, mtod(m, char *), m->m_len);
|
|
sopt->sopt_valsize -= m->m_len;
|
|
sopt->sopt_val = (char *)sopt->sopt_val + m->m_len;
|
|
m = m->m_next;
|
|
}
|
|
if (m != NULL) /* should be allocated enoughly at ip6_sooptmcopyin() */
|
|
panic("ip6_sooptmcopyin");
|
|
return 0;
|
|
}
|
|
|
|
/* XXX; copyout mbuf chain data into soopt for (__FreeBSD__ < 3) routines. */
|
|
int
|
|
soopt_mcopyout(struct sockopt *sopt, struct mbuf *m)
|
|
{
|
|
struct mbuf *m0 = m;
|
|
size_t valsize = 0;
|
|
|
|
if (sopt->sopt_val == NULL)
|
|
return 0;
|
|
while (m != NULL && sopt->sopt_valsize >= m->m_len) {
|
|
if (sopt->sopt_td != NULL) {
|
|
int error;
|
|
|
|
error = copyout(mtod(m, char *), sopt->sopt_val,
|
|
m->m_len);
|
|
if (error != 0) {
|
|
m_freem(m0);
|
|
return(error);
|
|
}
|
|
} else
|
|
bcopy(mtod(m, char *), sopt->sopt_val, m->m_len);
|
|
sopt->sopt_valsize -= m->m_len;
|
|
sopt->sopt_val = (char *)sopt->sopt_val + m->m_len;
|
|
valsize += m->m_len;
|
|
m = m->m_next;
|
|
}
|
|
if (m != NULL) {
|
|
/* enough soopt buffer should be given from user-land */
|
|
m_freem(m0);
|
|
return(EINVAL);
|
|
}
|
|
sopt->sopt_valsize = valsize;
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
sohasoutofband(so)
|
|
struct socket *so;
|
|
{
|
|
if (so->so_sigio != NULL)
|
|
pgsigio(&so->so_sigio, SIGURG, 0);
|
|
selwakeuppri(&so->so_rcv.sb_sel, PSOCK);
|
|
}
|
|
|
|
int
|
|
sopoll(struct socket *so, int events, struct ucred *active_cred,
|
|
struct thread *td)
|
|
{
|
|
int revents = 0;
|
|
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
if (events & (POLLIN | POLLRDNORM))
|
|
if (soreadable(so))
|
|
revents |= events & (POLLIN | POLLRDNORM);
|
|
|
|
if (events & POLLINIGNEOF)
|
|
if (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat ||
|
|
!TAILQ_EMPTY(&so->so_comp) || so->so_error)
|
|
revents |= POLLINIGNEOF;
|
|
|
|
if (events & (POLLOUT | POLLWRNORM))
|
|
if (sowriteable(so))
|
|
revents |= events & (POLLOUT | POLLWRNORM);
|
|
|
|
if (events & (POLLPRI | POLLRDBAND))
|
|
if (so->so_oobmark || (so->so_rcv.sb_state & SBS_RCVATMARK))
|
|
revents |= events & (POLLPRI | POLLRDBAND);
|
|
|
|
if (revents == 0) {
|
|
if (events &
|
|
(POLLIN | POLLINIGNEOF | POLLPRI | POLLRDNORM |
|
|
POLLRDBAND)) {
|
|
selrecord(td, &so->so_rcv.sb_sel);
|
|
so->so_rcv.sb_flags |= SB_SEL;
|
|
}
|
|
|
|
if (events & (POLLOUT | POLLWRNORM)) {
|
|
selrecord(td, &so->so_snd.sb_sel);
|
|
so->so_snd.sb_flags |= SB_SEL;
|
|
}
|
|
}
|
|
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
return (revents);
|
|
}
|
|
|
|
int
|
|
soo_kqfilter(struct file *fp, struct knote *kn)
|
|
{
|
|
struct socket *so = kn->kn_fp->f_data;
|
|
struct sockbuf *sb;
|
|
|
|
switch (kn->kn_filter) {
|
|
case EVFILT_READ:
|
|
if (so->so_options & SO_ACCEPTCONN)
|
|
kn->kn_fop = &solisten_filtops;
|
|
else
|
|
kn->kn_fop = &soread_filtops;
|
|
sb = &so->so_rcv;
|
|
break;
|
|
case EVFILT_WRITE:
|
|
kn->kn_fop = &sowrite_filtops;
|
|
sb = &so->so_snd;
|
|
break;
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
|
|
SOCKBUF_LOCK(sb);
|
|
knlist_add(&sb->sb_sel.si_note, kn, 1);
|
|
sb->sb_flags |= SB_KNOTE;
|
|
SOCKBUF_UNLOCK(sb);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
filt_sordetach(struct knote *kn)
|
|
{
|
|
struct socket *so = kn->kn_fp->f_data;
|
|
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
knlist_remove(&so->so_rcv.sb_sel.si_note, kn, 1);
|
|
if (knlist_empty(&so->so_rcv.sb_sel.si_note))
|
|
so->so_rcv.sb_flags &= ~SB_KNOTE;
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
filt_soread(struct knote *kn, long hint)
|
|
{
|
|
struct socket *so;
|
|
|
|
so = kn->kn_fp->f_data;
|
|
SOCKBUF_LOCK_ASSERT(&so->so_rcv);
|
|
|
|
kn->kn_data = so->so_rcv.sb_cc - so->so_rcv.sb_ctl;
|
|
if (so->so_rcv.sb_state & SBS_CANTRCVMORE) {
|
|
kn->kn_flags |= EV_EOF;
|
|
kn->kn_fflags = so->so_error;
|
|
return (1);
|
|
} else if (so->so_error) /* temporary udp error */
|
|
return (1);
|
|
else if (kn->kn_sfflags & NOTE_LOWAT)
|
|
return (kn->kn_data >= kn->kn_sdata);
|
|
else
|
|
return (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat);
|
|
}
|
|
|
|
static void
|
|
filt_sowdetach(struct knote *kn)
|
|
{
|
|
struct socket *so = kn->kn_fp->f_data;
|
|
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
knlist_remove(&so->so_snd.sb_sel.si_note, kn, 1);
|
|
if (knlist_empty(&so->so_snd.sb_sel.si_note))
|
|
so->so_snd.sb_flags &= ~SB_KNOTE;
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
filt_sowrite(struct knote *kn, long hint)
|
|
{
|
|
struct socket *so;
|
|
|
|
so = kn->kn_fp->f_data;
|
|
SOCKBUF_LOCK_ASSERT(&so->so_snd);
|
|
kn->kn_data = sbspace(&so->so_snd);
|
|
if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
|
|
kn->kn_flags |= EV_EOF;
|
|
kn->kn_fflags = so->so_error;
|
|
return (1);
|
|
} else if (so->so_error) /* temporary udp error */
|
|
return (1);
|
|
else if (((so->so_state & SS_ISCONNECTED) == 0) &&
|
|
(so->so_proto->pr_flags & PR_CONNREQUIRED))
|
|
return (0);
|
|
else if (kn->kn_sfflags & NOTE_LOWAT)
|
|
return (kn->kn_data >= kn->kn_sdata);
|
|
else
|
|
return (kn->kn_data >= so->so_snd.sb_lowat);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
filt_solisten(struct knote *kn, long hint)
|
|
{
|
|
struct socket *so = kn->kn_fp->f_data;
|
|
|
|
kn->kn_data = so->so_qlen;
|
|
return (! TAILQ_EMPTY(&so->so_comp));
|
|
}
|
|
|
|
int
|
|
socheckuid(struct socket *so, uid_t uid)
|
|
{
|
|
|
|
if (so == NULL)
|
|
return (EPERM);
|
|
if (so->so_cred->cr_uid != uid)
|
|
return (EPERM);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
somaxconn_sysctl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error;
|
|
int val;
|
|
|
|
val = somaxconn;
|
|
error = sysctl_handle_int(oidp, &val, sizeof(int), req);
|
|
if (error || !req->newptr )
|
|
return (error);
|
|
|
|
if (val < 1 || val > USHRT_MAX)
|
|
return (EINVAL);
|
|
|
|
somaxconn = val;
|
|
return (0);
|
|
}
|