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uipc_socket.c revision 1.146
      1  1.146    dyoung /*	$NetBSD: uipc_socket.c,v 1.146 2007/11/24 07:46:11 dyoung Exp $	*/
      2   1.64   thorpej 
      3   1.64   thorpej /*-
      4  1.137        ad  * Copyright (c) 2002, 2007 The NetBSD Foundation, Inc.
      5   1.64   thorpej  * All rights reserved.
      6   1.64   thorpej  *
      7   1.64   thorpej  * This code is derived from software contributed to The NetBSD Foundation
      8   1.64   thorpej  * by Jason R. Thorpe of Wasabi Systems, Inc.
      9   1.64   thorpej  *
     10   1.64   thorpej  * Redistribution and use in source and binary forms, with or without
     11   1.64   thorpej  * modification, are permitted provided that the following conditions
     12   1.64   thorpej  * are met:
     13   1.64   thorpej  * 1. Redistributions of source code must retain the above copyright
     14   1.64   thorpej  *    notice, this list of conditions and the following disclaimer.
     15   1.64   thorpej  * 2. Redistributions in binary form must reproduce the above copyright
     16   1.64   thorpej  *    notice, this list of conditions and the following disclaimer in the
     17   1.64   thorpej  *    documentation and/or other materials provided with the distribution.
     18   1.64   thorpej  * 3. All advertising materials mentioning features or use of this software
     19   1.64   thorpej  *    must display the following acknowledgement:
     20   1.64   thorpej  *	This product includes software developed by the NetBSD
     21   1.64   thorpej  *	Foundation, Inc. and its contributors.
     22   1.64   thorpej  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23   1.64   thorpej  *    contributors may be used to endorse or promote products derived
     24   1.64   thorpej  *    from this software without specific prior written permission.
     25   1.64   thorpej  *
     26   1.64   thorpej  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27   1.64   thorpej  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28   1.64   thorpej  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29   1.64   thorpej  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30   1.64   thorpej  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31   1.64   thorpej  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32   1.64   thorpej  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33   1.64   thorpej  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34   1.64   thorpej  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35   1.64   thorpej  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36   1.64   thorpej  * POSSIBILITY OF SUCH DAMAGE.
     37   1.64   thorpej  */
     38   1.16       cgd 
     39    1.1       cgd /*
     40   1.15   mycroft  * Copyright (c) 1982, 1986, 1988, 1990, 1993
     41   1.15   mycroft  *	The Regents of the University of California.  All rights reserved.
     42    1.1       cgd  *
     43    1.1       cgd  * Redistribution and use in source and binary forms, with or without
     44    1.1       cgd  * modification, are permitted provided that the following conditions
     45    1.1       cgd  * are met:
     46    1.1       cgd  * 1. Redistributions of source code must retain the above copyright
     47    1.1       cgd  *    notice, this list of conditions and the following disclaimer.
     48    1.1       cgd  * 2. Redistributions in binary form must reproduce the above copyright
     49    1.1       cgd  *    notice, this list of conditions and the following disclaimer in the
     50    1.1       cgd  *    documentation and/or other materials provided with the distribution.
     51   1.85       agc  * 3. Neither the name of the University nor the names of its contributors
     52    1.1       cgd  *    may be used to endorse or promote products derived from this software
     53    1.1       cgd  *    without specific prior written permission.
     54    1.1       cgd  *
     55    1.1       cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     56    1.1       cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     57    1.1       cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     58    1.1       cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     59    1.1       cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     60    1.1       cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     61    1.1       cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     62    1.1       cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     63    1.1       cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     64    1.1       cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     65    1.1       cgd  * SUCH DAMAGE.
     66    1.1       cgd  *
     67   1.32      fvdl  *	@(#)uipc_socket.c	8.6 (Berkeley) 5/2/95
     68    1.1       cgd  */
     69   1.59     lukem 
     70   1.59     lukem #include <sys/cdefs.h>
     71  1.146    dyoung __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.146 2007/11/24 07:46:11 dyoung Exp $");
     72   1.64   thorpej 
     73   1.64   thorpej #include "opt_sock_counters.h"
     74   1.64   thorpej #include "opt_sosend_loan.h"
     75   1.81    martin #include "opt_mbuftrace.h"
     76   1.84     ragge #include "opt_somaxkva.h"
     77    1.1       cgd 
     78    1.9   mycroft #include <sys/param.h>
     79    1.9   mycroft #include <sys/systm.h>
     80    1.9   mycroft #include <sys/proc.h>
     81    1.9   mycroft #include <sys/file.h>
     82  1.142    dyoung #include <sys/filedesc.h>
     83    1.9   mycroft #include <sys/malloc.h>
     84    1.9   mycroft #include <sys/mbuf.h>
     85    1.9   mycroft #include <sys/domain.h>
     86    1.9   mycroft #include <sys/kernel.h>
     87    1.9   mycroft #include <sys/protosw.h>
     88    1.9   mycroft #include <sys/socket.h>
     89    1.9   mycroft #include <sys/socketvar.h>
     90   1.21  christos #include <sys/signalvar.h>
     91    1.9   mycroft #include <sys/resourcevar.h>
     92   1.37   thorpej #include <sys/pool.h>
     93   1.72  jdolecek #include <sys/event.h>
     94   1.89  christos #include <sys/poll.h>
     95  1.118      elad #include <sys/kauth.h>
     96  1.136        ad #include <sys/mutex.h>
     97  1.136        ad #include <sys/condvar.h>
     98   1.37   thorpej 
     99   1.64   thorpej #include <uvm/uvm.h>
    100   1.64   thorpej 
    101  1.135        ad POOL_INIT(socket_pool, sizeof(struct socket), 0, 0, 0, "sockpl", NULL,
    102  1.135        ad     IPL_SOFTNET);
    103   1.77   thorpej 
    104   1.77   thorpej MALLOC_DEFINE(M_SOOPTS, "soopts", "socket options");
    105   1.77   thorpej MALLOC_DEFINE(M_SONAME, "soname", "socket name");
    106   1.37   thorpej 
    107  1.142    dyoung extern const struct fileops socketops;
    108  1.142    dyoung 
    109   1.54     lukem extern int	somaxconn;			/* patchable (XXX sysctl) */
    110   1.54     lukem int		somaxconn = SOMAXCONN;
    111   1.49  jonathan 
    112   1.64   thorpej #ifdef SOSEND_COUNTERS
    113   1.64   thorpej #include <sys/device.h>
    114   1.64   thorpej 
    115  1.113   thorpej static struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
    116   1.64   thorpej     NULL, "sosend", "loan big");
    117  1.113   thorpej static struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
    118   1.64   thorpej     NULL, "sosend", "copy big");
    119  1.113   thorpej static struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
    120   1.64   thorpej     NULL, "sosend", "copy small");
    121  1.113   thorpej static struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
    122   1.64   thorpej     NULL, "sosend", "kva limit");
    123   1.64   thorpej 
    124   1.64   thorpej #define	SOSEND_COUNTER_INCR(ev)		(ev)->ev_count++
    125   1.64   thorpej 
    126  1.101      matt EVCNT_ATTACH_STATIC(sosend_loan_big);
    127  1.101      matt EVCNT_ATTACH_STATIC(sosend_copy_big);
    128  1.101      matt EVCNT_ATTACH_STATIC(sosend_copy_small);
    129  1.101      matt EVCNT_ATTACH_STATIC(sosend_kvalimit);
    130   1.64   thorpej #else
    131   1.64   thorpej 
    132   1.64   thorpej #define	SOSEND_COUNTER_INCR(ev)		/* nothing */
    133   1.64   thorpej 
    134   1.64   thorpej #endif /* SOSEND_COUNTERS */
    135   1.64   thorpej 
    136  1.119      yamt static struct callback_entry sokva_reclaimerentry;
    137    1.1       cgd 
    138   1.71   thorpej #ifdef SOSEND_NO_LOAN
    139  1.121      yamt int sock_loan_thresh = -1;
    140   1.71   thorpej #else
    141  1.121      yamt int sock_loan_thresh = 4096;
    142   1.65   thorpej #endif
    143   1.64   thorpej 
    144  1.136        ad static kmutex_t so_pendfree_lock;
    145  1.113   thorpej static struct mbuf *so_pendfree;
    146   1.64   thorpej 
    147   1.84     ragge #ifndef SOMAXKVA
    148   1.84     ragge #define	SOMAXKVA (16 * 1024 * 1024)
    149   1.84     ragge #endif
    150   1.84     ragge int somaxkva = SOMAXKVA;
    151  1.113   thorpej static int socurkva;
    152  1.136        ad static kcondvar_t socurkva_cv;
    153   1.64   thorpej 
    154   1.64   thorpej #define	SOCK_LOAN_CHUNK		65536
    155   1.64   thorpej 
    156  1.117      yamt static size_t sodopendfree(void);
    157  1.117      yamt static size_t sodopendfreel(void);
    158   1.93      yamt 
    159  1.113   thorpej static vsize_t
    160  1.129      yamt sokvareserve(struct socket *so, vsize_t len)
    161   1.80      yamt {
    162   1.98  christos 	int error;
    163   1.80      yamt 
    164  1.136        ad 	mutex_enter(&so_pendfree_lock);
    165   1.80      yamt 	while (socurkva + len > somaxkva) {
    166   1.93      yamt 		size_t freed;
    167   1.93      yamt 
    168   1.93      yamt 		/*
    169   1.93      yamt 		 * try to do pendfree.
    170   1.93      yamt 		 */
    171   1.93      yamt 
    172  1.117      yamt 		freed = sodopendfreel();
    173   1.93      yamt 
    174   1.93      yamt 		/*
    175   1.93      yamt 		 * if some kva was freed, try again.
    176   1.93      yamt 		 */
    177   1.93      yamt 
    178   1.93      yamt 		if (freed)
    179   1.80      yamt 			continue;
    180   1.93      yamt 
    181   1.80      yamt 		SOSEND_COUNTER_INCR(&sosend_kvalimit);
    182  1.136        ad 		error = cv_wait_sig(&socurkva_cv, &so_pendfree_lock);
    183   1.98  christos 		if (error) {
    184   1.98  christos 			len = 0;
    185   1.98  christos 			break;
    186   1.98  christos 		}
    187   1.80      yamt 	}
    188   1.93      yamt 	socurkva += len;
    189  1.136        ad 	mutex_exit(&so_pendfree_lock);
    190   1.98  christos 	return len;
    191   1.95      yamt }
    192   1.95      yamt 
    193  1.113   thorpej static void
    194   1.95      yamt sokvaunreserve(vsize_t len)
    195   1.95      yamt {
    196   1.95      yamt 
    197  1.136        ad 	mutex_enter(&so_pendfree_lock);
    198   1.95      yamt 	socurkva -= len;
    199  1.136        ad 	cv_broadcast(&socurkva_cv);
    200  1.136        ad 	mutex_exit(&so_pendfree_lock);
    201   1.95      yamt }
    202   1.95      yamt 
    203   1.95      yamt /*
    204   1.95      yamt  * sokvaalloc: allocate kva for loan.
    205   1.95      yamt  */
    206   1.95      yamt 
    207   1.95      yamt vaddr_t
    208   1.95      yamt sokvaalloc(vsize_t len, struct socket *so)
    209   1.95      yamt {
    210   1.95      yamt 	vaddr_t lva;
    211   1.95      yamt 
    212   1.95      yamt 	/*
    213   1.95      yamt 	 * reserve kva.
    214   1.95      yamt 	 */
    215   1.95      yamt 
    216   1.98  christos 	if (sokvareserve(so, len) == 0)
    217   1.98  christos 		return 0;
    218   1.93      yamt 
    219   1.93      yamt 	/*
    220   1.93      yamt 	 * allocate kva.
    221   1.93      yamt 	 */
    222   1.80      yamt 
    223  1.109      yamt 	lva = uvm_km_alloc(kernel_map, len, 0, UVM_KMF_VAONLY | UVM_KMF_WAITVA);
    224   1.95      yamt 	if (lva == 0) {
    225   1.95      yamt 		sokvaunreserve(len);
    226   1.80      yamt 		return (0);
    227   1.95      yamt 	}
    228   1.80      yamt 
    229   1.80      yamt 	return lva;
    230   1.80      yamt }
    231   1.80      yamt 
    232   1.93      yamt /*
    233   1.93      yamt  * sokvafree: free kva for loan.
    234   1.93      yamt  */
    235   1.93      yamt 
    236   1.80      yamt void
    237   1.80      yamt sokvafree(vaddr_t sva, vsize_t len)
    238   1.80      yamt {
    239   1.93      yamt 
    240   1.93      yamt 	/*
    241   1.93      yamt 	 * free kva.
    242   1.93      yamt 	 */
    243   1.80      yamt 
    244  1.109      yamt 	uvm_km_free(kernel_map, sva, len, UVM_KMF_VAONLY);
    245   1.93      yamt 
    246   1.93      yamt 	/*
    247   1.93      yamt 	 * unreserve kva.
    248   1.93      yamt 	 */
    249   1.93      yamt 
    250   1.95      yamt 	sokvaunreserve(len);
    251   1.80      yamt }
    252   1.80      yamt 
    253   1.64   thorpej static void
    254  1.134  christos sodoloanfree(struct vm_page **pgs, void *buf, size_t size)
    255   1.64   thorpej {
    256   1.64   thorpej 	vaddr_t va, sva, eva;
    257   1.64   thorpej 	vsize_t len;
    258   1.64   thorpej 	paddr_t pa;
    259   1.64   thorpej 	int i, npgs;
    260   1.64   thorpej 
    261   1.64   thorpej 	eva = round_page((vaddr_t) buf + size);
    262   1.64   thorpej 	sva = trunc_page((vaddr_t) buf);
    263   1.64   thorpej 	len = eva - sva;
    264   1.64   thorpej 	npgs = len >> PAGE_SHIFT;
    265   1.64   thorpej 
    266   1.79   thorpej 	if (__predict_false(pgs == NULL)) {
    267   1.79   thorpej 		pgs = alloca(npgs * sizeof(*pgs));
    268   1.64   thorpej 
    269   1.79   thorpej 		for (i = 0, va = sva; va < eva; i++, va += PAGE_SIZE) {
    270  1.133   thorpej 			if (pmap_extract(pmap_kernel(), va, &pa) == false)
    271   1.79   thorpej 				panic("sodoloanfree: va 0x%lx not mapped", va);
    272   1.79   thorpej 			pgs[i] = PHYS_TO_VM_PAGE(pa);
    273   1.79   thorpej 		}
    274   1.64   thorpej 	}
    275   1.64   thorpej 
    276   1.64   thorpej 	pmap_kremove(sva, len);
    277   1.64   thorpej 	pmap_update(pmap_kernel());
    278   1.64   thorpej 	uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE);
    279   1.80      yamt 	sokvafree(sva, len);
    280   1.64   thorpej }
    281   1.64   thorpej 
    282   1.64   thorpej static size_t
    283  1.117      yamt sodopendfree()
    284   1.64   thorpej {
    285   1.93      yamt 	size_t rv;
    286   1.64   thorpej 
    287  1.136        ad 	mutex_enter(&so_pendfree_lock);
    288  1.117      yamt 	rv = sodopendfreel();
    289  1.136        ad 	mutex_exit(&so_pendfree_lock);
    290   1.93      yamt 
    291   1.93      yamt 	return rv;
    292   1.93      yamt }
    293   1.93      yamt 
    294   1.93      yamt /*
    295   1.93      yamt  * sodopendfreel: free mbufs on "pendfree" list.
    296  1.136        ad  * unlock and relock so_pendfree_lock when freeing mbufs.
    297   1.93      yamt  *
    298  1.136        ad  * => called with so_pendfree_lock held.
    299   1.93      yamt  */
    300   1.93      yamt 
    301   1.93      yamt static size_t
    302  1.117      yamt sodopendfreel()
    303   1.93      yamt {
    304  1.137        ad 	struct mbuf *m, *next;
    305   1.93      yamt 	size_t rv = 0;
    306   1.93      yamt 
    307  1.136        ad 	KASSERT(mutex_owned(&so_pendfree_lock));
    308   1.64   thorpej 
    309  1.137        ad 	while (so_pendfree != NULL) {
    310   1.64   thorpej 		m = so_pendfree;
    311   1.93      yamt 		so_pendfree = NULL;
    312  1.136        ad 		mutex_exit(&so_pendfree_lock);
    313   1.93      yamt 
    314   1.93      yamt 		for (; m != NULL; m = next) {
    315   1.93      yamt 			next = m->m_next;
    316   1.93      yamt 
    317   1.93      yamt 			rv += m->m_ext.ext_size;
    318   1.93      yamt 			sodoloanfree((m->m_flags & M_EXT_PAGES) ?
    319   1.93      yamt 			    m->m_ext.ext_pgs : NULL, m->m_ext.ext_buf,
    320   1.93      yamt 			    m->m_ext.ext_size);
    321  1.145        ad 			pool_cache_put(mb_cache, m);
    322   1.93      yamt 		}
    323   1.64   thorpej 
    324  1.136        ad 		mutex_enter(&so_pendfree_lock);
    325   1.64   thorpej 	}
    326   1.64   thorpej 
    327   1.64   thorpej 	return (rv);
    328   1.64   thorpej }
    329   1.64   thorpej 
    330   1.80      yamt void
    331  1.134  christos soloanfree(struct mbuf *m, void *buf, size_t size, void *arg)
    332   1.64   thorpej {
    333   1.64   thorpej 
    334   1.64   thorpej 	if (m == NULL) {
    335   1.93      yamt 
    336   1.93      yamt 		/*
    337   1.93      yamt 		 * called from MEXTREMOVE.
    338   1.93      yamt 		 */
    339   1.93      yamt 
    340   1.79   thorpej 		sodoloanfree(NULL, buf, size);
    341   1.64   thorpej 		return;
    342   1.64   thorpej 	}
    343   1.64   thorpej 
    344   1.93      yamt 	/*
    345   1.93      yamt 	 * postpone freeing mbuf.
    346   1.93      yamt 	 *
    347   1.93      yamt 	 * we can't do it in interrupt context
    348   1.93      yamt 	 * because we need to put kva back to kernel_map.
    349   1.93      yamt 	 */
    350   1.93      yamt 
    351  1.136        ad 	mutex_enter(&so_pendfree_lock);
    352   1.92      yamt 	m->m_next = so_pendfree;
    353   1.92      yamt 	so_pendfree = m;
    354  1.136        ad 	cv_broadcast(&socurkva_cv);
    355  1.136        ad 	mutex_exit(&so_pendfree_lock);
    356   1.64   thorpej }
    357   1.64   thorpej 
    358   1.64   thorpej static long
    359   1.64   thorpej sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space)
    360   1.64   thorpej {
    361   1.64   thorpej 	struct iovec *iov = uio->uio_iov;
    362   1.64   thorpej 	vaddr_t sva, eva;
    363   1.64   thorpej 	vsize_t len;
    364   1.64   thorpej 	vaddr_t lva, va;
    365   1.80      yamt 	int npgs, i, error;
    366   1.64   thorpej 
    367  1.116      yamt 	if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace))
    368   1.64   thorpej 		return (0);
    369   1.64   thorpej 
    370   1.64   thorpej 	if (iov->iov_len < (size_t) space)
    371   1.64   thorpej 		space = iov->iov_len;
    372   1.64   thorpej 	if (space > SOCK_LOAN_CHUNK)
    373   1.64   thorpej 		space = SOCK_LOAN_CHUNK;
    374   1.64   thorpej 
    375   1.64   thorpej 	eva = round_page((vaddr_t) iov->iov_base + space);
    376   1.64   thorpej 	sva = trunc_page((vaddr_t) iov->iov_base);
    377   1.64   thorpej 	len = eva - sva;
    378   1.64   thorpej 	npgs = len >> PAGE_SHIFT;
    379   1.64   thorpej 
    380   1.79   thorpej 	/* XXX KDASSERT */
    381   1.79   thorpej 	KASSERT(npgs <= M_EXT_MAXPAGES);
    382   1.79   thorpej 
    383   1.80      yamt 	lva = sokvaalloc(len, so);
    384   1.64   thorpej 	if (lva == 0)
    385   1.80      yamt 		return 0;
    386   1.64   thorpej 
    387  1.116      yamt 	error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len,
    388   1.79   thorpej 	    m->m_ext.ext_pgs, UVM_LOAN_TOPAGE);
    389   1.64   thorpej 	if (error) {
    390   1.80      yamt 		sokvafree(lva, len);
    391   1.64   thorpej 		return (0);
    392   1.64   thorpej 	}
    393   1.64   thorpej 
    394   1.64   thorpej 	for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE)
    395   1.79   thorpej 		pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]),
    396   1.79   thorpej 		    VM_PROT_READ);
    397   1.64   thorpej 	pmap_update(pmap_kernel());
    398   1.64   thorpej 
    399   1.64   thorpej 	lva += (vaddr_t) iov->iov_base & PAGE_MASK;
    400   1.64   thorpej 
    401  1.134  christos 	MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so);
    402   1.79   thorpej 	m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP;
    403   1.64   thorpej 
    404   1.64   thorpej 	uio->uio_resid -= space;
    405   1.64   thorpej 	/* uio_offset not updated, not set/used for write(2) */
    406  1.134  christos 	uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space;
    407   1.64   thorpej 	uio->uio_iov->iov_len -= space;
    408   1.64   thorpej 	if (uio->uio_iov->iov_len == 0) {
    409   1.64   thorpej 		uio->uio_iov++;
    410   1.64   thorpej 		uio->uio_iovcnt--;
    411   1.64   thorpej 	}
    412   1.64   thorpej 
    413   1.64   thorpej 	return (space);
    414   1.64   thorpej }
    415   1.64   thorpej 
    416  1.119      yamt static int
    417  1.129      yamt sokva_reclaim_callback(struct callback_entry *ce, void *obj, void *arg)
    418  1.119      yamt {
    419  1.119      yamt 
    420  1.119      yamt 	KASSERT(ce == &sokva_reclaimerentry);
    421  1.119      yamt 	KASSERT(obj == NULL);
    422  1.119      yamt 
    423  1.119      yamt 	sodopendfree();
    424  1.119      yamt 	if (!vm_map_starved_p(kernel_map)) {
    425  1.119      yamt 		return CALLBACK_CHAIN_ABORT;
    426  1.119      yamt 	}
    427  1.119      yamt 	return CALLBACK_CHAIN_CONTINUE;
    428  1.119      yamt }
    429  1.119      yamt 
    430  1.142    dyoung struct mbuf *
    431  1.142    dyoung getsombuf(struct socket *so)
    432  1.142    dyoung {
    433  1.142    dyoung 	struct mbuf *m;
    434  1.142    dyoung 
    435  1.142    dyoung 	m = m_get(M_WAIT, MT_SONAME);
    436  1.142    dyoung 	MCLAIM(m, so->so_mowner);
    437  1.142    dyoung 	return m;
    438  1.142    dyoung }
    439  1.142    dyoung 
    440  1.142    dyoung struct mbuf *
    441  1.142    dyoung m_intopt(struct socket *so, int val)
    442  1.142    dyoung {
    443  1.142    dyoung 	struct mbuf *m;
    444  1.142    dyoung 
    445  1.142    dyoung 	m = getsombuf(so);
    446  1.142    dyoung 	m->m_len = sizeof(int);
    447  1.142    dyoung 	*mtod(m, int *) = val;
    448  1.142    dyoung 	return m;
    449  1.142    dyoung }
    450  1.142    dyoung 
    451  1.119      yamt void
    452  1.119      yamt soinit(void)
    453  1.119      yamt {
    454  1.119      yamt 
    455  1.136        ad 	mutex_init(&so_pendfree_lock, MUTEX_DRIVER, IPL_VM);
    456  1.136        ad 	cv_init(&socurkva_cv, "sokva");
    457  1.136        ad 
    458  1.119      yamt 	/* Set the initial adjusted socket buffer size. */
    459  1.119      yamt 	if (sb_max_set(sb_max))
    460  1.119      yamt 		panic("bad initial sb_max value: %lu", sb_max);
    461  1.119      yamt 
    462  1.119      yamt 	callback_register(&vm_map_to_kernel(kernel_map)->vmk_reclaim_callback,
    463  1.119      yamt 	    &sokva_reclaimerentry, NULL, sokva_reclaim_callback);
    464  1.119      yamt }
    465  1.119      yamt 
    466    1.1       cgd /*
    467    1.1       cgd  * Socket operation routines.
    468    1.1       cgd  * These routines are called by the routines in
    469    1.1       cgd  * sys_socket.c or from a system process, and
    470    1.1       cgd  * implement the semantics of socket operations by
    471    1.1       cgd  * switching out to the protocol specific routines.
    472    1.1       cgd  */
    473    1.1       cgd /*ARGSUSED*/
    474    1.3    andrew int
    475  1.114  christos socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l)
    476    1.1       cgd {
    477   1.99      matt 	const struct protosw	*prp;
    478   1.54     lukem 	struct socket	*so;
    479  1.115      yamt 	uid_t		uid;
    480   1.54     lukem 	int		error, s;
    481    1.1       cgd 
    482  1.132      elad 	error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET,
    483  1.132      elad 	    KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type),
    484  1.132      elad 	    KAUTH_ARG(proto));
    485  1.140    dyoung 	if (error != 0)
    486  1.140    dyoung 		return error;
    487  1.127      elad 
    488    1.1       cgd 	if (proto)
    489    1.1       cgd 		prp = pffindproto(dom, proto, type);
    490    1.1       cgd 	else
    491    1.1       cgd 		prp = pffindtype(dom, type);
    492  1.140    dyoung 	if (prp == NULL) {
    493  1.120  ginsbach 		/* no support for domain */
    494  1.120  ginsbach 		if (pffinddomain(dom) == 0)
    495  1.140    dyoung 			return EAFNOSUPPORT;
    496  1.120  ginsbach 		/* no support for socket type */
    497  1.120  ginsbach 		if (proto == 0 && type != 0)
    498  1.140    dyoung 			return EPROTOTYPE;
    499  1.140    dyoung 		return EPROTONOSUPPORT;
    500  1.120  ginsbach 	}
    501  1.140    dyoung 	if (prp->pr_usrreq == NULL)
    502  1.140    dyoung 		return EPROTONOSUPPORT;
    503    1.1       cgd 	if (prp->pr_type != type)
    504  1.140    dyoung 		return EPROTOTYPE;
    505   1.39      matt 	s = splsoftnet();
    506   1.37   thorpej 	so = pool_get(&socket_pool, PR_WAITOK);
    507  1.140    dyoung 	memset(so, 0, sizeof(*so));
    508   1.31   thorpej 	TAILQ_INIT(&so->so_q0);
    509   1.31   thorpej 	TAILQ_INIT(&so->so_q);
    510    1.1       cgd 	so->so_type = type;
    511    1.1       cgd 	so->so_proto = prp;
    512   1.33      matt 	so->so_send = sosend;
    513   1.33      matt 	so->so_receive = soreceive;
    514   1.78      matt #ifdef MBUFTRACE
    515   1.78      matt 	so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner;
    516   1.78      matt 	so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner;
    517   1.78      matt 	so->so_mowner = &prp->pr_domain->dom_mowner;
    518   1.78      matt #endif
    519  1.143        ad 	selinit(&so->so_rcv.sb_sel);
    520  1.143        ad 	selinit(&so->so_snd.sb_sel);
    521  1.138     rmind 	uid = kauth_cred_geteuid(l->l_cred);
    522  1.115      yamt 	so->so_uidinfo = uid_find(uid);
    523  1.140    dyoung 	error = (*prp->pr_usrreq)(so, PRU_ATTACH, NULL,
    524  1.140    dyoung 	    (struct mbuf *)(long)proto, NULL, l);
    525  1.140    dyoung 	if (error != 0) {
    526    1.1       cgd 		so->so_state |= SS_NOFDREF;
    527    1.1       cgd 		sofree(so);
    528   1.39      matt 		splx(s);
    529  1.140    dyoung 		return error;
    530    1.1       cgd 	}
    531   1.39      matt 	splx(s);
    532    1.1       cgd 	*aso = so;
    533  1.140    dyoung 	return 0;
    534    1.1       cgd }
    535    1.1       cgd 
    536  1.142    dyoung /* On success, write file descriptor to fdout and return zero.  On
    537  1.142    dyoung  * failure, return non-zero; *fdout will be undefined.
    538  1.142    dyoung  */
    539  1.142    dyoung int
    540  1.142    dyoung fsocreate(int domain, struct socket **sop, int type, int protocol,
    541  1.142    dyoung     struct lwp *l, int *fdout)
    542  1.142    dyoung {
    543  1.142    dyoung 	struct filedesc	*fdp;
    544  1.142    dyoung 	struct socket	*so;
    545  1.142    dyoung 	struct file	*fp;
    546  1.142    dyoung 	int		fd, error;
    547  1.142    dyoung 
    548  1.142    dyoung 	fdp = l->l_proc->p_fd;
    549  1.142    dyoung 	/* falloc() will use the desciptor for us */
    550  1.142    dyoung 	if ((error = falloc(l, &fp, &fd)) != 0)
    551  1.142    dyoung 		return (error);
    552  1.142    dyoung 	fp->f_flag = FREAD|FWRITE;
    553  1.142    dyoung 	fp->f_type = DTYPE_SOCKET;
    554  1.142    dyoung 	fp->f_ops = &socketops;
    555  1.142    dyoung 	error = socreate(domain, &so, type, protocol, l);
    556  1.142    dyoung 	if (error != 0) {
    557  1.142    dyoung 		FILE_UNUSE(fp, l);
    558  1.142    dyoung 		fdremove(fdp, fd);
    559  1.142    dyoung 		ffree(fp);
    560  1.142    dyoung 	} else {
    561  1.142    dyoung 		if (sop != NULL)
    562  1.142    dyoung 			*sop = so;
    563  1.142    dyoung 		fp->f_data = so;
    564  1.142    dyoung 		FILE_SET_MATURE(fp);
    565  1.142    dyoung 		FILE_UNUSE(fp, l);
    566  1.142    dyoung 		*fdout = fd;
    567  1.142    dyoung 	}
    568  1.142    dyoung 	return error;
    569  1.142    dyoung }
    570  1.142    dyoung 
    571    1.3    andrew int
    572  1.114  christos sobind(struct socket *so, struct mbuf *nam, struct lwp *l)
    573    1.1       cgd {
    574   1.54     lukem 	int	s, error;
    575    1.1       cgd 
    576   1.54     lukem 	s = splsoftnet();
    577  1.140    dyoung 	error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, NULL, nam, NULL, l);
    578    1.1       cgd 	splx(s);
    579  1.140    dyoung 	return error;
    580    1.1       cgd }
    581    1.1       cgd 
    582    1.3    andrew int
    583   1.54     lukem solisten(struct socket *so, int backlog)
    584    1.1       cgd {
    585   1.54     lukem 	int	s, error;
    586    1.1       cgd 
    587   1.54     lukem 	s = splsoftnet();
    588  1.140    dyoung 	error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, NULL,
    589  1.140    dyoung 	    NULL, NULL, NULL);
    590  1.140    dyoung 	if (error != 0) {
    591    1.1       cgd 		splx(s);
    592  1.140    dyoung 		return error;
    593    1.1       cgd 	}
    594   1.63      matt 	if (TAILQ_EMPTY(&so->so_q))
    595    1.1       cgd 		so->so_options |= SO_ACCEPTCONN;
    596    1.1       cgd 	if (backlog < 0)
    597    1.1       cgd 		backlog = 0;
    598   1.49  jonathan 	so->so_qlimit = min(backlog, somaxconn);
    599    1.1       cgd 	splx(s);
    600  1.140    dyoung 	return 0;
    601    1.1       cgd }
    602    1.1       cgd 
    603   1.21  christos void
    604   1.54     lukem sofree(struct socket *so)
    605    1.1       cgd {
    606    1.1       cgd 
    607   1.43   mycroft 	if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0)
    608    1.1       cgd 		return;
    609   1.43   mycroft 	if (so->so_head) {
    610   1.43   mycroft 		/*
    611   1.43   mycroft 		 * We must not decommission a socket that's on the accept(2)
    612   1.43   mycroft 		 * queue.  If we do, then accept(2) may hang after select(2)
    613   1.43   mycroft 		 * indicated that the listening socket was ready.
    614   1.43   mycroft 		 */
    615   1.43   mycroft 		if (!soqremque(so, 0))
    616   1.43   mycroft 			return;
    617   1.43   mycroft 	}
    618   1.98  christos 	if (so->so_rcv.sb_hiwat)
    619  1.110  christos 		(void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
    620   1.98  christos 		    RLIM_INFINITY);
    621   1.98  christos 	if (so->so_snd.sb_hiwat)
    622  1.110  christos 		(void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
    623   1.98  christos 		    RLIM_INFINITY);
    624   1.98  christos 	sbrelease(&so->so_snd, so);
    625    1.1       cgd 	sorflush(so);
    626  1.143        ad 	seldestroy(&so->so_rcv.sb_sel);
    627  1.143        ad 	seldestroy(&so->so_snd.sb_sel);
    628   1.37   thorpej 	pool_put(&socket_pool, so);
    629    1.1       cgd }
    630    1.1       cgd 
    631    1.1       cgd /*
    632    1.1       cgd  * Close a socket on last file table reference removal.
    633    1.1       cgd  * Initiate disconnect if connected.
    634    1.1       cgd  * Free socket when disconnect complete.
    635    1.1       cgd  */
    636    1.3    andrew int
    637   1.54     lukem soclose(struct socket *so)
    638    1.1       cgd {
    639   1.54     lukem 	struct socket	*so2;
    640   1.54     lukem 	int		s, error;
    641    1.1       cgd 
    642   1.54     lukem 	error = 0;
    643   1.54     lukem 	s = splsoftnet();		/* conservative */
    644    1.1       cgd 	if (so->so_options & SO_ACCEPTCONN) {
    645   1.63      matt 		while ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
    646   1.42   mycroft 			(void) soqremque(so2, 0);
    647   1.41   mycroft 			(void) soabort(so2);
    648   1.41   mycroft 		}
    649   1.63      matt 		while ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
    650   1.42   mycroft 			(void) soqremque(so2, 1);
    651   1.41   mycroft 			(void) soabort(so2);
    652   1.41   mycroft 		}
    653    1.1       cgd 	}
    654    1.1       cgd 	if (so->so_pcb == 0)
    655    1.1       cgd 		goto discard;
    656    1.1       cgd 	if (so->so_state & SS_ISCONNECTED) {
    657    1.1       cgd 		if ((so->so_state & SS_ISDISCONNECTING) == 0) {
    658    1.1       cgd 			error = sodisconnect(so);
    659    1.1       cgd 			if (error)
    660    1.1       cgd 				goto drop;
    661    1.1       cgd 		}
    662    1.1       cgd 		if (so->so_options & SO_LINGER) {
    663    1.1       cgd 			if ((so->so_state & SS_ISDISCONNECTING) &&
    664    1.1       cgd 			    (so->so_state & SS_NBIO))
    665    1.1       cgd 				goto drop;
    666   1.21  christos 			while (so->so_state & SS_ISCONNECTED) {
    667  1.134  christos 				error = tsleep((void *)&so->so_timeo,
    668   1.21  christos 					       PSOCK | PCATCH, netcls,
    669   1.30   thorpej 					       so->so_linger * hz);
    670   1.21  christos 				if (error)
    671    1.1       cgd 					break;
    672   1.21  christos 			}
    673    1.1       cgd 		}
    674    1.1       cgd 	}
    675   1.54     lukem  drop:
    676    1.1       cgd 	if (so->so_pcb) {
    677   1.22   mycroft 		int error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
    678  1.140    dyoung 		    NULL, NULL, NULL, NULL);
    679    1.1       cgd 		if (error == 0)
    680    1.1       cgd 			error = error2;
    681    1.1       cgd 	}
    682   1.54     lukem  discard:
    683    1.1       cgd 	if (so->so_state & SS_NOFDREF)
    684    1.1       cgd 		panic("soclose: NOFDREF");
    685    1.1       cgd 	so->so_state |= SS_NOFDREF;
    686    1.1       cgd 	sofree(so);
    687    1.1       cgd 	splx(s);
    688    1.1       cgd 	return (error);
    689    1.1       cgd }
    690    1.1       cgd 
    691    1.1       cgd /*
    692   1.20   mycroft  * Must be called at splsoftnet...
    693    1.1       cgd  */
    694    1.3    andrew int
    695   1.54     lukem soabort(struct socket *so)
    696    1.1       cgd {
    697  1.139      yamt 	int error;
    698    1.1       cgd 
    699  1.139      yamt 	KASSERT(so->so_head == NULL);
    700  1.140    dyoung 	error = (*so->so_proto->pr_usrreq)(so, PRU_ABORT, NULL,
    701  1.140    dyoung 	    NULL, NULL, NULL);
    702  1.139      yamt 	if (error) {
    703  1.139      yamt 		sofree(so);
    704  1.139      yamt 	}
    705  1.139      yamt 	return error;
    706    1.1       cgd }
    707    1.1       cgd 
    708    1.3    andrew int
    709   1.54     lukem soaccept(struct socket *so, struct mbuf *nam)
    710    1.1       cgd {
    711   1.54     lukem 	int	s, error;
    712    1.1       cgd 
    713   1.54     lukem 	error = 0;
    714   1.54     lukem 	s = splsoftnet();
    715    1.1       cgd 	if ((so->so_state & SS_NOFDREF) == 0)
    716    1.1       cgd 		panic("soaccept: !NOFDREF");
    717    1.1       cgd 	so->so_state &= ~SS_NOFDREF;
    718   1.55   thorpej 	if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
    719   1.55   thorpej 	    (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
    720   1.41   mycroft 		error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT,
    721  1.140    dyoung 		    NULL, nam, NULL, NULL);
    722   1.41   mycroft 	else
    723   1.53    itojun 		error = ECONNABORTED;
    724   1.52    itojun 
    725    1.1       cgd 	splx(s);
    726    1.1       cgd 	return (error);
    727    1.1       cgd }
    728    1.1       cgd 
    729    1.3    andrew int
    730  1.114  christos soconnect(struct socket *so, struct mbuf *nam, struct lwp *l)
    731    1.1       cgd {
    732   1.54     lukem 	int		s, error;
    733    1.1       cgd 
    734    1.1       cgd 	if (so->so_options & SO_ACCEPTCONN)
    735    1.1       cgd 		return (EOPNOTSUPP);
    736   1.20   mycroft 	s = splsoftnet();
    737    1.1       cgd 	/*
    738    1.1       cgd 	 * If protocol is connection-based, can only connect once.
    739    1.1       cgd 	 * Otherwise, if connected, try to disconnect first.
    740    1.1       cgd 	 * This allows user to disconnect by connecting to, e.g.,
    741    1.1       cgd 	 * a null address.
    742    1.1       cgd 	 */
    743    1.1       cgd 	if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
    744    1.1       cgd 	    ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
    745    1.1       cgd 	    (error = sodisconnect(so))))
    746    1.1       cgd 		error = EISCONN;
    747    1.1       cgd 	else
    748    1.1       cgd 		error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
    749  1.140    dyoung 		    NULL, nam, NULL, l);
    750    1.1       cgd 	splx(s);
    751    1.1       cgd 	return (error);
    752    1.1       cgd }
    753    1.1       cgd 
    754    1.3    andrew int
    755   1.54     lukem soconnect2(struct socket *so1, struct socket *so2)
    756    1.1       cgd {
    757   1.54     lukem 	int	s, error;
    758    1.1       cgd 
    759   1.54     lukem 	s = splsoftnet();
    760   1.22   mycroft 	error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
    761  1.140    dyoung 	    NULL, (struct mbuf *)so2, NULL, NULL);
    762    1.1       cgd 	splx(s);
    763    1.1       cgd 	return (error);
    764    1.1       cgd }
    765    1.1       cgd 
    766    1.3    andrew int
    767   1.54     lukem sodisconnect(struct socket *so)
    768    1.1       cgd {
    769   1.54     lukem 	int	s, error;
    770    1.1       cgd 
    771   1.54     lukem 	s = splsoftnet();
    772    1.1       cgd 	if ((so->so_state & SS_ISCONNECTED) == 0) {
    773    1.1       cgd 		error = ENOTCONN;
    774    1.1       cgd 		goto bad;
    775    1.1       cgd 	}
    776    1.1       cgd 	if (so->so_state & SS_ISDISCONNECTING) {
    777    1.1       cgd 		error = EALREADY;
    778    1.1       cgd 		goto bad;
    779    1.1       cgd 	}
    780   1.22   mycroft 	error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
    781  1.140    dyoung 	    NULL, NULL, NULL, NULL);
    782   1.54     lukem  bad:
    783    1.1       cgd 	splx(s);
    784  1.117      yamt 	sodopendfree();
    785    1.1       cgd 	return (error);
    786    1.1       cgd }
    787    1.1       cgd 
    788   1.15   mycroft #define	SBLOCKWAIT(f)	(((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
    789    1.1       cgd /*
    790    1.1       cgd  * Send on a socket.
    791    1.1       cgd  * If send must go all at once and message is larger than
    792    1.1       cgd  * send buffering, then hard error.
    793    1.1       cgd  * Lock against other senders.
    794    1.1       cgd  * If must go all at once and not enough room now, then
    795    1.1       cgd  * inform user that this would block and do nothing.
    796    1.1       cgd  * Otherwise, if nonblocking, send as much as possible.
    797    1.1       cgd  * The data to be sent is described by "uio" if nonzero,
    798    1.1       cgd  * otherwise by the mbuf chain "top" (which must be null
    799    1.1       cgd  * if uio is not).  Data provided in mbuf chain must be small
    800    1.1       cgd  * enough to send all at once.
    801    1.1       cgd  *
    802    1.1       cgd  * Returns nonzero on error, timeout or signal; callers
    803    1.1       cgd  * must check for short counts if EINTR/ERESTART are returned.
    804    1.1       cgd  * Data and control buffers are freed on return.
    805    1.1       cgd  */
    806    1.3    andrew int
    807   1.54     lukem sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
    808  1.114  christos 	struct mbuf *control, int flags, struct lwp *l)
    809    1.1       cgd {
    810   1.54     lukem 	struct mbuf	**mp, *m;
    811  1.114  christos 	struct proc	*p;
    812   1.58  jdolecek 	long		space, len, resid, clen, mlen;
    813   1.58  jdolecek 	int		error, s, dontroute, atomic;
    814   1.54     lukem 
    815  1.114  christos 	p = l->l_proc;
    816  1.117      yamt 	sodopendfree();
    817   1.64   thorpej 
    818   1.54     lukem 	clen = 0;
    819   1.54     lukem 	atomic = sosendallatonce(so) || top;
    820    1.1       cgd 	if (uio)
    821    1.1       cgd 		resid = uio->uio_resid;
    822    1.1       cgd 	else
    823    1.1       cgd 		resid = top->m_pkthdr.len;
    824    1.7       cgd 	/*
    825    1.7       cgd 	 * In theory resid should be unsigned.
    826    1.7       cgd 	 * However, space must be signed, as it might be less than 0
    827    1.7       cgd 	 * if we over-committed, and we must use a signed comparison
    828    1.7       cgd 	 * of space and resid.  On the other hand, a negative resid
    829    1.7       cgd 	 * causes us to loop sending 0-length segments to the protocol.
    830    1.7       cgd 	 */
    831   1.29   mycroft 	if (resid < 0) {
    832   1.29   mycroft 		error = EINVAL;
    833   1.29   mycroft 		goto out;
    834   1.29   mycroft 	}
    835    1.1       cgd 	dontroute =
    836    1.1       cgd 	    (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
    837    1.1       cgd 	    (so->so_proto->pr_flags & PR_ATOMIC);
    838  1.102  jonathan 	if (p)
    839  1.102  jonathan 		p->p_stats->p_ru.ru_msgsnd++;
    840    1.1       cgd 	if (control)
    841    1.1       cgd 		clen = control->m_len;
    842    1.1       cgd #define	snderr(errno)	{ error = errno; splx(s); goto release; }
    843    1.1       cgd 
    844   1.54     lukem  restart:
    845   1.21  christos 	if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
    846    1.1       cgd 		goto out;
    847    1.1       cgd 	do {
    848   1.20   mycroft 		s = splsoftnet();
    849    1.1       cgd 		if (so->so_state & SS_CANTSENDMORE)
    850    1.1       cgd 			snderr(EPIPE);
    851   1.48   thorpej 		if (so->so_error) {
    852   1.48   thorpej 			error = so->so_error;
    853   1.48   thorpej 			so->so_error = 0;
    854   1.48   thorpej 			splx(s);
    855   1.48   thorpej 			goto release;
    856   1.48   thorpej 		}
    857    1.1       cgd 		if ((so->so_state & SS_ISCONNECTED) == 0) {
    858    1.1       cgd 			if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
    859    1.1       cgd 				if ((so->so_state & SS_ISCONFIRMING) == 0 &&
    860    1.1       cgd 				    !(resid == 0 && clen != 0))
    861    1.1       cgd 					snderr(ENOTCONN);
    862    1.1       cgd 			} else if (addr == 0)
    863    1.1       cgd 				snderr(EDESTADDRREQ);
    864    1.1       cgd 		}
    865    1.1       cgd 		space = sbspace(&so->so_snd);
    866    1.1       cgd 		if (flags & MSG_OOB)
    867    1.1       cgd 			space += 1024;
    868   1.21  christos 		if ((atomic && resid > so->so_snd.sb_hiwat) ||
    869   1.11   mycroft 		    clen > so->so_snd.sb_hiwat)
    870   1.11   mycroft 			snderr(EMSGSIZE);
    871   1.96   mycroft 		if (space < resid + clen &&
    872    1.1       cgd 		    (atomic || space < so->so_snd.sb_lowat || space < clen)) {
    873    1.1       cgd 			if (so->so_state & SS_NBIO)
    874    1.1       cgd 				snderr(EWOULDBLOCK);
    875    1.1       cgd 			sbunlock(&so->so_snd);
    876    1.1       cgd 			error = sbwait(&so->so_snd);
    877    1.1       cgd 			splx(s);
    878    1.1       cgd 			if (error)
    879    1.1       cgd 				goto out;
    880    1.1       cgd 			goto restart;
    881    1.1       cgd 		}
    882    1.1       cgd 		splx(s);
    883    1.1       cgd 		mp = &top;
    884    1.1       cgd 		space -= clen;
    885    1.1       cgd 		do {
    886   1.45        tv 			if (uio == NULL) {
    887   1.45        tv 				/*
    888   1.45        tv 				 * Data is prepackaged in "top".
    889   1.45        tv 				 */
    890   1.45        tv 				resid = 0;
    891   1.45        tv 				if (flags & MSG_EOR)
    892   1.45        tv 					top->m_flags |= M_EOR;
    893   1.45        tv 			} else do {
    894  1.144    dyoung 				if (top == NULL) {
    895   1.78      matt 					m = m_gethdr(M_WAIT, MT_DATA);
    896   1.45        tv 					mlen = MHLEN;
    897   1.45        tv 					m->m_pkthdr.len = 0;
    898  1.140    dyoung 					m->m_pkthdr.rcvif = NULL;
    899   1.45        tv 				} else {
    900   1.78      matt 					m = m_get(M_WAIT, MT_DATA);
    901   1.45        tv 					mlen = MLEN;
    902   1.45        tv 				}
    903   1.78      matt 				MCLAIM(m, so->so_snd.sb_mowner);
    904  1.121      yamt 				if (sock_loan_thresh >= 0 &&
    905  1.121      yamt 				    uio->uio_iov->iov_len >= sock_loan_thresh &&
    906  1.121      yamt 				    space >= sock_loan_thresh &&
    907   1.64   thorpej 				    (len = sosend_loan(so, uio, m,
    908   1.64   thorpej 						       space)) != 0) {
    909   1.64   thorpej 					SOSEND_COUNTER_INCR(&sosend_loan_big);
    910   1.64   thorpej 					space -= len;
    911   1.64   thorpej 					goto have_data;
    912   1.64   thorpej 				}
    913   1.45        tv 				if (resid >= MINCLSIZE && space >= MCLBYTES) {
    914   1.64   thorpej 					SOSEND_COUNTER_INCR(&sosend_copy_big);
    915   1.78      matt 					m_clget(m, M_WAIT);
    916   1.45        tv 					if ((m->m_flags & M_EXT) == 0)
    917   1.45        tv 						goto nopages;
    918   1.45        tv 					mlen = MCLBYTES;
    919   1.45        tv 					if (atomic && top == 0) {
    920   1.58  jdolecek 						len = lmin(MCLBYTES - max_hdr,
    921   1.54     lukem 						    resid);
    922   1.45        tv 						m->m_data += max_hdr;
    923   1.45        tv 					} else
    924   1.58  jdolecek 						len = lmin(MCLBYTES, resid);
    925   1.45        tv 					space -= len;
    926   1.45        tv 				} else {
    927   1.64   thorpej  nopages:
    928   1.64   thorpej 					SOSEND_COUNTER_INCR(&sosend_copy_small);
    929   1.58  jdolecek 					len = lmin(lmin(mlen, resid), space);
    930   1.45        tv 					space -= len;
    931   1.45        tv 					/*
    932   1.45        tv 					 * For datagram protocols, leave room
    933   1.45        tv 					 * for protocol headers in first mbuf.
    934   1.45        tv 					 */
    935   1.45        tv 					if (atomic && top == 0 && len < mlen)
    936   1.45        tv 						MH_ALIGN(m, len);
    937   1.45        tv 				}
    938  1.144    dyoung 				error = uiomove(mtod(m, void *), (int)len, uio);
    939   1.64   thorpej  have_data:
    940   1.45        tv 				resid = uio->uio_resid;
    941   1.45        tv 				m->m_len = len;
    942   1.45        tv 				*mp = m;
    943   1.45        tv 				top->m_pkthdr.len += len;
    944  1.144    dyoung 				if (error != 0)
    945   1.45        tv 					goto release;
    946   1.45        tv 				mp = &m->m_next;
    947   1.45        tv 				if (resid <= 0) {
    948   1.45        tv 					if (flags & MSG_EOR)
    949   1.45        tv 						top->m_flags |= M_EOR;
    950   1.45        tv 					break;
    951   1.45        tv 				}
    952   1.45        tv 			} while (space > 0 && atomic);
    953  1.108     perry 
    954   1.46  sommerfe 			s = splsoftnet();
    955   1.46  sommerfe 
    956   1.46  sommerfe 			if (so->so_state & SS_CANTSENDMORE)
    957   1.46  sommerfe 				snderr(EPIPE);
    958   1.45        tv 
    959   1.45        tv 			if (dontroute)
    960   1.45        tv 				so->so_options |= SO_DONTROUTE;
    961   1.45        tv 			if (resid > 0)
    962   1.45        tv 				so->so_state |= SS_MORETOCOME;
    963   1.46  sommerfe 			error = (*so->so_proto->pr_usrreq)(so,
    964   1.46  sommerfe 			    (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
    965  1.114  christos 			    top, addr, control, curlwp);	/* XXX */
    966   1.45        tv 			if (dontroute)
    967   1.45        tv 				so->so_options &= ~SO_DONTROUTE;
    968   1.45        tv 			if (resid > 0)
    969   1.45        tv 				so->so_state &= ~SS_MORETOCOME;
    970   1.46  sommerfe 			splx(s);
    971   1.46  sommerfe 
    972   1.45        tv 			clen = 0;
    973  1.144    dyoung 			control = NULL;
    974  1.144    dyoung 			top = NULL;
    975   1.45        tv 			mp = &top;
    976  1.144    dyoung 			if (error != 0)
    977    1.1       cgd 				goto release;
    978    1.1       cgd 		} while (resid && space > 0);
    979    1.1       cgd 	} while (resid);
    980    1.1       cgd 
    981   1.54     lukem  release:
    982    1.1       cgd 	sbunlock(&so->so_snd);
    983   1.54     lukem  out:
    984    1.1       cgd 	if (top)
    985    1.1       cgd 		m_freem(top);
    986    1.1       cgd 	if (control)
    987    1.1       cgd 		m_freem(control);
    988    1.1       cgd 	return (error);
    989    1.1       cgd }
    990    1.1       cgd 
    991    1.1       cgd /*
    992    1.1       cgd  * Implement receive operations on a socket.
    993    1.1       cgd  * We depend on the way that records are added to the sockbuf
    994    1.1       cgd  * by sbappend*.  In particular, each record (mbufs linked through m_next)
    995    1.1       cgd  * must begin with an address if the protocol so specifies,
    996    1.1       cgd  * followed by an optional mbuf or mbufs containing ancillary data,
    997    1.1       cgd  * and then zero or more mbufs of data.
    998    1.1       cgd  * In order to avoid blocking network interrupts for the entire time here,
    999    1.1       cgd  * we splx() while doing the actual copy to user space.
   1000    1.1       cgd  * Although the sockbuf is locked, new data may still be appended,
   1001    1.1       cgd  * and thus we must maintain consistency of the sockbuf during that time.
   1002    1.1       cgd  *
   1003    1.1       cgd  * The caller may receive the data as a single mbuf chain by supplying
   1004    1.1       cgd  * an mbuf **mp0 for use in returning the chain.  The uio is then used
   1005    1.1       cgd  * only for the count in uio_resid.
   1006    1.1       cgd  */
   1007    1.3    andrew int
   1008   1.54     lukem soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
   1009   1.54     lukem 	struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
   1010    1.1       cgd {
   1011  1.116      yamt 	struct lwp *l = curlwp;
   1012   1.54     lukem 	struct mbuf	*m, **mp;
   1013  1.146    dyoung 	int atomic, flags, len, error, s, offset, moff, type, orig_resid;
   1014   1.99      matt 	const struct protosw	*pr;
   1015   1.54     lukem 	struct mbuf	*nextrecord;
   1016   1.67        he 	int		mbuf_removed = 0;
   1017  1.146    dyoung 	const struct domain *dom;
   1018   1.64   thorpej 
   1019   1.54     lukem 	pr = so->so_proto;
   1020  1.146    dyoung 	atomic = pr->pr_flags & PR_ATOMIC;
   1021  1.146    dyoung 	dom = pr->pr_domain;
   1022    1.1       cgd 	mp = mp0;
   1023   1.54     lukem 	type = 0;
   1024   1.54     lukem 	orig_resid = uio->uio_resid;
   1025  1.102  jonathan 
   1026  1.144    dyoung 	if (paddr != NULL)
   1027  1.144    dyoung 		*paddr = NULL;
   1028  1.144    dyoung 	if (controlp != NULL)
   1029  1.144    dyoung 		*controlp = NULL;
   1030  1.144    dyoung 	if (flagsp != NULL)
   1031    1.1       cgd 		flags = *flagsp &~ MSG_EOR;
   1032    1.1       cgd 	else
   1033    1.1       cgd 		flags = 0;
   1034   1.66     enami 
   1035   1.66     enami 	if ((flags & MSG_DONTWAIT) == 0)
   1036  1.117      yamt 		sodopendfree();
   1037   1.66     enami 
   1038    1.1       cgd 	if (flags & MSG_OOB) {
   1039    1.1       cgd 		m = m_get(M_WAIT, MT_DATA);
   1040   1.17       cgd 		error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
   1041  1.140    dyoung 		    (struct mbuf *)(long)(flags & MSG_PEEK), NULL, l);
   1042    1.1       cgd 		if (error)
   1043    1.1       cgd 			goto bad;
   1044    1.1       cgd 		do {
   1045  1.134  christos 			error = uiomove(mtod(m, void *),
   1046    1.1       cgd 			    (int) min(uio->uio_resid, m->m_len), uio);
   1047    1.1       cgd 			m = m_free(m);
   1048  1.144    dyoung 		} while (uio->uio_resid > 0 && error == 0 && m);
   1049   1.54     lukem  bad:
   1050  1.144    dyoung 		if (m != NULL)
   1051    1.1       cgd 			m_freem(m);
   1052  1.144    dyoung 		return error;
   1053    1.1       cgd 	}
   1054  1.144    dyoung 	if (mp != NULL)
   1055  1.140    dyoung 		*mp = NULL;
   1056    1.1       cgd 	if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
   1057  1.140    dyoung 		(*pr->pr_usrreq)(so, PRU_RCVD, NULL, NULL, NULL, l);
   1058    1.1       cgd 
   1059   1.54     lukem  restart:
   1060   1.21  christos 	if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0)
   1061  1.144    dyoung 		return error;
   1062   1.20   mycroft 	s = splsoftnet();
   1063    1.1       cgd 
   1064    1.1       cgd 	m = so->so_rcv.sb_mb;
   1065    1.1       cgd 	/*
   1066    1.1       cgd 	 * If we have less data than requested, block awaiting more
   1067    1.1       cgd 	 * (subject to any timeout) if:
   1068   1.15   mycroft 	 *   1. the current count is less than the low water mark,
   1069    1.1       cgd 	 *   2. MSG_WAITALL is set, and it is possible to do the entire
   1070   1.15   mycroft 	 *	receive operation at once if we block (resid <= hiwat), or
   1071   1.15   mycroft 	 *   3. MSG_DONTWAIT is not set.
   1072    1.1       cgd 	 * If MSG_WAITALL is set but resid is larger than the receive buffer,
   1073    1.1       cgd 	 * we have to do the receive in sections, and thus risk returning
   1074    1.1       cgd 	 * a short count if a timeout or signal occurs after we start.
   1075    1.1       cgd 	 */
   1076  1.144    dyoung 	if (m == NULL ||
   1077  1.144    dyoung 	    ((flags & MSG_DONTWAIT) == 0 &&
   1078  1.144    dyoung 	     so->so_rcv.sb_cc < uio->uio_resid &&
   1079  1.144    dyoung 	     (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
   1080  1.144    dyoung 	      ((flags & MSG_WAITALL) &&
   1081  1.144    dyoung 	       uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
   1082  1.146    dyoung 	     m->m_nextpkt == NULL && !atomic)) {
   1083    1.1       cgd #ifdef DIAGNOSTIC
   1084  1.144    dyoung 		if (m == NULL && so->so_rcv.sb_cc)
   1085    1.1       cgd 			panic("receive 1");
   1086    1.1       cgd #endif
   1087    1.1       cgd 		if (so->so_error) {
   1088  1.144    dyoung 			if (m != NULL)
   1089   1.15   mycroft 				goto dontblock;
   1090    1.1       cgd 			error = so->so_error;
   1091    1.1       cgd 			if ((flags & MSG_PEEK) == 0)
   1092    1.1       cgd 				so->so_error = 0;
   1093    1.1       cgd 			goto release;
   1094    1.1       cgd 		}
   1095    1.1       cgd 		if (so->so_state & SS_CANTRCVMORE) {
   1096  1.144    dyoung 			if (m != NULL)
   1097   1.15   mycroft 				goto dontblock;
   1098    1.1       cgd 			else
   1099    1.1       cgd 				goto release;
   1100    1.1       cgd 		}
   1101  1.144    dyoung 		for (; m != NULL; m = m->m_next)
   1102    1.1       cgd 			if (m->m_type == MT_OOBDATA  || (m->m_flags & M_EOR)) {
   1103    1.1       cgd 				m = so->so_rcv.sb_mb;
   1104    1.1       cgd 				goto dontblock;
   1105    1.1       cgd 			}
   1106    1.1       cgd 		if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
   1107    1.1       cgd 		    (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
   1108    1.1       cgd 			error = ENOTCONN;
   1109    1.1       cgd 			goto release;
   1110    1.1       cgd 		}
   1111    1.1       cgd 		if (uio->uio_resid == 0)
   1112    1.1       cgd 			goto release;
   1113   1.15   mycroft 		if ((so->so_state & SS_NBIO) || (flags & MSG_DONTWAIT)) {
   1114    1.1       cgd 			error = EWOULDBLOCK;
   1115    1.1       cgd 			goto release;
   1116    1.1       cgd 		}
   1117   1.69   thorpej 		SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
   1118   1.69   thorpej 		SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
   1119    1.1       cgd 		sbunlock(&so->so_rcv);
   1120    1.1       cgd 		error = sbwait(&so->so_rcv);
   1121    1.1       cgd 		splx(s);
   1122  1.144    dyoung 		if (error != 0)
   1123  1.144    dyoung 			return error;
   1124    1.1       cgd 		goto restart;
   1125    1.1       cgd 	}
   1126   1.54     lukem  dontblock:
   1127   1.69   thorpej 	/*
   1128   1.69   thorpej 	 * On entry here, m points to the first record of the socket buffer.
   1129   1.69   thorpej 	 * While we process the initial mbufs containing address and control
   1130   1.69   thorpej 	 * info, we save a copy of m->m_nextpkt into nextrecord.
   1131   1.69   thorpej 	 */
   1132  1.144    dyoung 	if (l != NULL)
   1133  1.114  christos 		l->l_proc->p_stats->p_ru.ru_msgrcv++;
   1134   1.69   thorpej 	KASSERT(m == so->so_rcv.sb_mb);
   1135   1.69   thorpej 	SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
   1136   1.69   thorpej 	SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
   1137    1.1       cgd 	nextrecord = m->m_nextpkt;
   1138    1.1       cgd 	if (pr->pr_flags & PR_ADDR) {
   1139    1.1       cgd #ifdef DIAGNOSTIC
   1140    1.1       cgd 		if (m->m_type != MT_SONAME)
   1141    1.1       cgd 			panic("receive 1a");
   1142    1.1       cgd #endif
   1143    1.3    andrew 		orig_resid = 0;
   1144    1.1       cgd 		if (flags & MSG_PEEK) {
   1145    1.1       cgd 			if (paddr)
   1146    1.1       cgd 				*paddr = m_copy(m, 0, m->m_len);
   1147    1.1       cgd 			m = m->m_next;
   1148    1.1       cgd 		} else {
   1149    1.1       cgd 			sbfree(&so->so_rcv, m);
   1150   1.67        he 			mbuf_removed = 1;
   1151  1.144    dyoung 			if (paddr != NULL) {
   1152    1.1       cgd 				*paddr = m;
   1153    1.1       cgd 				so->so_rcv.sb_mb = m->m_next;
   1154  1.144    dyoung 				m->m_next = NULL;
   1155    1.1       cgd 				m = so->so_rcv.sb_mb;
   1156    1.1       cgd 			} else {
   1157    1.1       cgd 				MFREE(m, so->so_rcv.sb_mb);
   1158    1.1       cgd 				m = so->so_rcv.sb_mb;
   1159    1.1       cgd 			}
   1160    1.1       cgd 		}
   1161    1.1       cgd 	}
   1162  1.144    dyoung 	while (m != NULL && m->m_type == MT_CONTROL && error == 0) {
   1163    1.1       cgd 		if (flags & MSG_PEEK) {
   1164  1.144    dyoung 			if (controlp != NULL)
   1165    1.1       cgd 				*controlp = m_copy(m, 0, m->m_len);
   1166    1.1       cgd 			m = m->m_next;
   1167    1.1       cgd 		} else {
   1168    1.1       cgd 			sbfree(&so->so_rcv, m);
   1169   1.67        he 			mbuf_removed = 1;
   1170  1.144    dyoung 			if (controlp != NULL) {
   1171  1.114  christos 				if (dom->dom_externalize && l &&
   1172    1.1       cgd 				    mtod(m, struct cmsghdr *)->cmsg_type ==
   1173    1.1       cgd 				    SCM_RIGHTS)
   1174  1.114  christos 					error = (*dom->dom_externalize)(m, l);
   1175    1.1       cgd 				*controlp = m;
   1176    1.1       cgd 				so->so_rcv.sb_mb = m->m_next;
   1177  1.144    dyoung 				m->m_next = NULL;
   1178    1.1       cgd 				m = so->so_rcv.sb_mb;
   1179    1.1       cgd 			} else {
   1180  1.106    itojun 				/*
   1181  1.106    itojun 				 * Dispose of any SCM_RIGHTS message that went
   1182  1.106    itojun 				 * through the read path rather than recv.
   1183  1.106    itojun 				 */
   1184  1.146    dyoung 				if (dom->dom_dispose &&
   1185  1.106    itojun 				    mtod(m, struct cmsghdr *)->cmsg_type == SCM_RIGHTS)
   1186  1.146    dyoung 					(*dom->dom_dispose)(m);
   1187    1.1       cgd 				MFREE(m, so->so_rcv.sb_mb);
   1188    1.1       cgd 				m = so->so_rcv.sb_mb;
   1189    1.1       cgd 			}
   1190    1.1       cgd 		}
   1191  1.144    dyoung 		if (controlp != NULL) {
   1192    1.3    andrew 			orig_resid = 0;
   1193    1.1       cgd 			controlp = &(*controlp)->m_next;
   1194    1.3    andrew 		}
   1195    1.1       cgd 	}
   1196   1.69   thorpej 
   1197   1.69   thorpej 	/*
   1198   1.69   thorpej 	 * If m is non-NULL, we have some data to read.  From now on,
   1199   1.69   thorpej 	 * make sure to keep sb_lastrecord consistent when working on
   1200   1.69   thorpej 	 * the last packet on the chain (nextrecord == NULL) and we
   1201   1.69   thorpej 	 * change m->m_nextpkt.
   1202   1.69   thorpej 	 */
   1203  1.144    dyoung 	if (m != NULL) {
   1204   1.69   thorpej 		if ((flags & MSG_PEEK) == 0) {
   1205    1.1       cgd 			m->m_nextpkt = nextrecord;
   1206   1.69   thorpej 			/*
   1207   1.69   thorpej 			 * If nextrecord == NULL (this is a single chain),
   1208   1.69   thorpej 			 * then sb_lastrecord may not be valid here if m
   1209   1.69   thorpej 			 * was changed earlier.
   1210   1.69   thorpej 			 */
   1211   1.69   thorpej 			if (nextrecord == NULL) {
   1212   1.69   thorpej 				KASSERT(so->so_rcv.sb_mb == m);
   1213   1.69   thorpej 				so->so_rcv.sb_lastrecord = m;
   1214   1.69   thorpej 			}
   1215   1.69   thorpej 		}
   1216    1.1       cgd 		type = m->m_type;
   1217    1.1       cgd 		if (type == MT_OOBDATA)
   1218    1.1       cgd 			flags |= MSG_OOB;
   1219   1.69   thorpej 	} else {
   1220   1.69   thorpej 		if ((flags & MSG_PEEK) == 0) {
   1221   1.69   thorpej 			KASSERT(so->so_rcv.sb_mb == m);
   1222   1.69   thorpej 			so->so_rcv.sb_mb = nextrecord;
   1223   1.70   thorpej 			SB_EMPTY_FIXUP(&so->so_rcv);
   1224   1.69   thorpej 		}
   1225    1.1       cgd 	}
   1226   1.69   thorpej 	SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
   1227   1.69   thorpej 	SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
   1228   1.69   thorpej 
   1229    1.1       cgd 	moff = 0;
   1230    1.1       cgd 	offset = 0;
   1231  1.144    dyoung 	while (m != NULL && uio->uio_resid > 0 && error == 0) {
   1232    1.1       cgd 		if (m->m_type == MT_OOBDATA) {
   1233    1.1       cgd 			if (type != MT_OOBDATA)
   1234    1.1       cgd 				break;
   1235    1.1       cgd 		} else if (type == MT_OOBDATA)
   1236    1.1       cgd 			break;
   1237    1.1       cgd #ifdef DIAGNOSTIC
   1238    1.1       cgd 		else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
   1239    1.1       cgd 			panic("receive 3");
   1240    1.1       cgd #endif
   1241    1.1       cgd 		so->so_state &= ~SS_RCVATMARK;
   1242    1.1       cgd 		len = uio->uio_resid;
   1243    1.1       cgd 		if (so->so_oobmark && len > so->so_oobmark - offset)
   1244    1.1       cgd 			len = so->so_oobmark - offset;
   1245    1.1       cgd 		if (len > m->m_len - moff)
   1246    1.1       cgd 			len = m->m_len - moff;
   1247    1.1       cgd 		/*
   1248    1.1       cgd 		 * If mp is set, just pass back the mbufs.
   1249    1.1       cgd 		 * Otherwise copy them out via the uio, then free.
   1250    1.1       cgd 		 * Sockbuf must be consistent here (points to current mbuf,
   1251    1.1       cgd 		 * it points to next record) when we drop priority;
   1252    1.1       cgd 		 * we must note any additions to the sockbuf when we
   1253    1.1       cgd 		 * block interrupts again.
   1254    1.1       cgd 		 */
   1255  1.144    dyoung 		if (mp == NULL) {
   1256   1.69   thorpej 			SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
   1257   1.69   thorpej 			SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
   1258    1.1       cgd 			splx(s);
   1259  1.134  christos 			error = uiomove(mtod(m, char *) + moff, (int)len, uio);
   1260   1.20   mycroft 			s = splsoftnet();
   1261  1.144    dyoung 			if (error != 0) {
   1262   1.67        he 				/*
   1263   1.67        he 				 * If any part of the record has been removed
   1264   1.67        he 				 * (such as the MT_SONAME mbuf, which will
   1265   1.67        he 				 * happen when PR_ADDR, and thus also
   1266   1.67        he 				 * PR_ATOMIC, is set), then drop the entire
   1267   1.67        he 				 * record to maintain the atomicity of the
   1268   1.67        he 				 * receive operation.
   1269   1.67        he 				 *
   1270   1.67        he 				 * This avoids a later panic("receive 1a")
   1271   1.67        he 				 * when compiled with DIAGNOSTIC.
   1272   1.67        he 				 */
   1273  1.146    dyoung 				if (m && mbuf_removed && atomic)
   1274   1.67        he 					(void) sbdroprecord(&so->so_rcv);
   1275   1.67        he 
   1276   1.57  jdolecek 				goto release;
   1277   1.67        he 			}
   1278    1.1       cgd 		} else
   1279    1.1       cgd 			uio->uio_resid -= len;
   1280    1.1       cgd 		if (len == m->m_len - moff) {
   1281    1.1       cgd 			if (m->m_flags & M_EOR)
   1282    1.1       cgd 				flags |= MSG_EOR;
   1283    1.1       cgd 			if (flags & MSG_PEEK) {
   1284    1.1       cgd 				m = m->m_next;
   1285    1.1       cgd 				moff = 0;
   1286    1.1       cgd 			} else {
   1287    1.1       cgd 				nextrecord = m->m_nextpkt;
   1288    1.1       cgd 				sbfree(&so->so_rcv, m);
   1289    1.1       cgd 				if (mp) {
   1290    1.1       cgd 					*mp = m;
   1291    1.1       cgd 					mp = &m->m_next;
   1292    1.1       cgd 					so->so_rcv.sb_mb = m = m->m_next;
   1293  1.140    dyoung 					*mp = NULL;
   1294    1.1       cgd 				} else {
   1295    1.1       cgd 					MFREE(m, so->so_rcv.sb_mb);
   1296    1.1       cgd 					m = so->so_rcv.sb_mb;
   1297    1.1       cgd 				}
   1298   1.69   thorpej 				/*
   1299   1.69   thorpej 				 * If m != NULL, we also know that
   1300   1.69   thorpej 				 * so->so_rcv.sb_mb != NULL.
   1301   1.69   thorpej 				 */
   1302   1.69   thorpej 				KASSERT(so->so_rcv.sb_mb == m);
   1303   1.69   thorpej 				if (m) {
   1304    1.1       cgd 					m->m_nextpkt = nextrecord;
   1305   1.69   thorpej 					if (nextrecord == NULL)
   1306   1.69   thorpej 						so->so_rcv.sb_lastrecord = m;
   1307   1.69   thorpej 				} else {
   1308   1.69   thorpej 					so->so_rcv.sb_mb = nextrecord;
   1309   1.70   thorpej 					SB_EMPTY_FIXUP(&so->so_rcv);
   1310   1.69   thorpej 				}
   1311   1.69   thorpej 				SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
   1312   1.69   thorpej 				SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
   1313    1.1       cgd 			}
   1314  1.144    dyoung 		} else if (flags & MSG_PEEK)
   1315  1.144    dyoung 			moff += len;
   1316  1.144    dyoung 		else {
   1317  1.144    dyoung 			if (mp != NULL)
   1318  1.144    dyoung 				*mp = m_copym(m, 0, len, M_WAIT);
   1319  1.144    dyoung 			m->m_data += len;
   1320  1.144    dyoung 			m->m_len -= len;
   1321  1.144    dyoung 			so->so_rcv.sb_cc -= len;
   1322    1.1       cgd 		}
   1323    1.1       cgd 		if (so->so_oobmark) {
   1324    1.1       cgd 			if ((flags & MSG_PEEK) == 0) {
   1325    1.1       cgd 				so->so_oobmark -= len;
   1326    1.1       cgd 				if (so->so_oobmark == 0) {
   1327    1.1       cgd 					so->so_state |= SS_RCVATMARK;
   1328    1.1       cgd 					break;
   1329    1.1       cgd 				}
   1330    1.7       cgd 			} else {
   1331    1.1       cgd 				offset += len;
   1332    1.7       cgd 				if (offset == so->so_oobmark)
   1333    1.7       cgd 					break;
   1334    1.7       cgd 			}
   1335    1.1       cgd 		}
   1336    1.1       cgd 		if (flags & MSG_EOR)
   1337    1.1       cgd 			break;
   1338    1.1       cgd 		/*
   1339    1.1       cgd 		 * If the MSG_WAITALL flag is set (for non-atomic socket),
   1340    1.1       cgd 		 * we must not quit until "uio->uio_resid == 0" or an error
   1341    1.1       cgd 		 * termination.  If a signal/timeout occurs, return
   1342    1.1       cgd 		 * with a short count but without error.
   1343    1.1       cgd 		 * Keep sockbuf locked against other readers.
   1344    1.1       cgd 		 */
   1345  1.144    dyoung 		while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
   1346    1.3    andrew 		    !sosendallatonce(so) && !nextrecord) {
   1347    1.1       cgd 			if (so->so_error || so->so_state & SS_CANTRCVMORE)
   1348    1.1       cgd 				break;
   1349   1.68      matt 			/*
   1350   1.68      matt 			 * If we are peeking and the socket receive buffer is
   1351   1.68      matt 			 * full, stop since we can't get more data to peek at.
   1352   1.68      matt 			 */
   1353   1.68      matt 			if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
   1354   1.68      matt 				break;
   1355   1.68      matt 			/*
   1356   1.68      matt 			 * If we've drained the socket buffer, tell the
   1357   1.68      matt 			 * protocol in case it needs to do something to
   1358   1.68      matt 			 * get it filled again.
   1359   1.68      matt 			 */
   1360   1.68      matt 			if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
   1361   1.68      matt 				(*pr->pr_usrreq)(so, PRU_RCVD,
   1362  1.140    dyoung 				    NULL, (struct mbuf *)(long)flags, NULL, l);
   1363   1.69   thorpej 			SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
   1364   1.69   thorpej 			SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
   1365    1.1       cgd 			error = sbwait(&so->so_rcv);
   1366  1.144    dyoung 			if (error != 0) {
   1367    1.1       cgd 				sbunlock(&so->so_rcv);
   1368    1.1       cgd 				splx(s);
   1369  1.144    dyoung 				return 0;
   1370    1.1       cgd 			}
   1371   1.21  christos 			if ((m = so->so_rcv.sb_mb) != NULL)
   1372    1.1       cgd 				nextrecord = m->m_nextpkt;
   1373    1.1       cgd 		}
   1374    1.1       cgd 	}
   1375    1.3    andrew 
   1376  1.146    dyoung 	if (m && atomic) {
   1377    1.3    andrew 		flags |= MSG_TRUNC;
   1378    1.3    andrew 		if ((flags & MSG_PEEK) == 0)
   1379    1.3    andrew 			(void) sbdroprecord(&so->so_rcv);
   1380    1.3    andrew 	}
   1381    1.1       cgd 	if ((flags & MSG_PEEK) == 0) {
   1382  1.144    dyoung 		if (m == NULL) {
   1383   1.69   thorpej 			/*
   1384   1.70   thorpej 			 * First part is an inline SB_EMPTY_FIXUP().  Second
   1385   1.69   thorpej 			 * part makes sure sb_lastrecord is up-to-date if
   1386   1.69   thorpej 			 * there is still data in the socket buffer.
   1387   1.69   thorpej 			 */
   1388    1.1       cgd 			so->so_rcv.sb_mb = nextrecord;
   1389   1.69   thorpej 			if (so->so_rcv.sb_mb == NULL) {
   1390   1.69   thorpej 				so->so_rcv.sb_mbtail = NULL;
   1391   1.69   thorpej 				so->so_rcv.sb_lastrecord = NULL;
   1392   1.69   thorpej 			} else if (nextrecord->m_nextpkt == NULL)
   1393   1.69   thorpej 				so->so_rcv.sb_lastrecord = nextrecord;
   1394   1.69   thorpej 		}
   1395   1.69   thorpej 		SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
   1396   1.69   thorpej 		SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
   1397    1.1       cgd 		if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
   1398  1.140    dyoung 			(*pr->pr_usrreq)(so, PRU_RCVD, NULL,
   1399  1.140    dyoung 			    (struct mbuf *)(long)flags, NULL, l);
   1400    1.1       cgd 	}
   1401    1.3    andrew 	if (orig_resid == uio->uio_resid && orig_resid &&
   1402    1.3    andrew 	    (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
   1403    1.3    andrew 		sbunlock(&so->so_rcv);
   1404    1.3    andrew 		splx(s);
   1405    1.3    andrew 		goto restart;
   1406    1.3    andrew 	}
   1407  1.108     perry 
   1408  1.144    dyoung 	if (flagsp != NULL)
   1409    1.1       cgd 		*flagsp |= flags;
   1410   1.54     lukem  release:
   1411    1.1       cgd 	sbunlock(&so->so_rcv);
   1412    1.1       cgd 	splx(s);
   1413  1.144    dyoung 	return error;
   1414    1.1       cgd }
   1415    1.1       cgd 
   1416   1.14   mycroft int
   1417   1.54     lukem soshutdown(struct socket *so, int how)
   1418    1.1       cgd {
   1419   1.99      matt 	const struct protosw	*pr;
   1420   1.34    kleink 
   1421   1.54     lukem 	pr = so->so_proto;
   1422   1.34    kleink 	if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
   1423   1.34    kleink 		return (EINVAL);
   1424    1.1       cgd 
   1425   1.34    kleink 	if (how == SHUT_RD || how == SHUT_RDWR)
   1426    1.1       cgd 		sorflush(so);
   1427   1.34    kleink 	if (how == SHUT_WR || how == SHUT_RDWR)
   1428  1.140    dyoung 		return (*pr->pr_usrreq)(so, PRU_SHUTDOWN, NULL,
   1429  1.140    dyoung 		    NULL, NULL, NULL);
   1430  1.144    dyoung 	return 0;
   1431    1.1       cgd }
   1432    1.1       cgd 
   1433   1.14   mycroft void
   1434   1.54     lukem sorflush(struct socket *so)
   1435    1.1       cgd {
   1436   1.54     lukem 	struct sockbuf	*sb, asb;
   1437   1.99      matt 	const struct protosw	*pr;
   1438   1.54     lukem 	int		s;
   1439    1.1       cgd 
   1440   1.54     lukem 	sb = &so->so_rcv;
   1441   1.54     lukem 	pr = so->so_proto;
   1442    1.1       cgd 	sb->sb_flags |= SB_NOINTR;
   1443   1.15   mycroft 	(void) sblock(sb, M_WAITOK);
   1444   1.56   thorpej 	s = splnet();
   1445    1.1       cgd 	socantrcvmore(so);
   1446    1.1       cgd 	sbunlock(sb);
   1447    1.1       cgd 	asb = *sb;
   1448   1.86  wrstuden 	/*
   1449   1.86  wrstuden 	 * Clear most of the sockbuf structure, but leave some of the
   1450   1.86  wrstuden 	 * fields valid.
   1451   1.86  wrstuden 	 */
   1452   1.86  wrstuden 	memset(&sb->sb_startzero, 0,
   1453   1.86  wrstuden 	    sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
   1454    1.1       cgd 	splx(s);
   1455    1.1       cgd 	if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose)
   1456    1.1       cgd 		(*pr->pr_domain->dom_dispose)(asb.sb_mb);
   1457   1.98  christos 	sbrelease(&asb, so);
   1458    1.1       cgd }
   1459    1.1       cgd 
   1460  1.142    dyoung static int
   1461  1.142    dyoung sosetopt1(struct socket *so, int level, int optname, struct mbuf *m)
   1462    1.1       cgd {
   1463  1.142    dyoung 	int optval, val;
   1464  1.130  christos 	struct linger	*l;
   1465  1.141      yamt 	struct sockbuf	*sb;
   1466  1.142    dyoung 	struct timeval *tv;
   1467  1.142    dyoung 
   1468  1.142    dyoung 	switch (optname) {
   1469  1.142    dyoung 
   1470  1.142    dyoung 	case SO_LINGER:
   1471  1.142    dyoung 		if (m == NULL || m->m_len != sizeof(struct linger))
   1472  1.142    dyoung 			return EINVAL;
   1473  1.142    dyoung 		l = mtod(m, struct linger *);
   1474  1.142    dyoung 		if (l->l_linger < 0 || l->l_linger > USHRT_MAX ||
   1475  1.142    dyoung 		    l->l_linger > (INT_MAX / hz))
   1476  1.142    dyoung 			return EDOM;
   1477  1.142    dyoung 		so->so_linger = l->l_linger;
   1478  1.142    dyoung 		if (l->l_onoff)
   1479  1.142    dyoung 			so->so_options |= SO_LINGER;
   1480  1.142    dyoung 		else
   1481  1.142    dyoung 			so->so_options &= ~SO_LINGER;
   1482  1.142    dyoung 		break;
   1483    1.1       cgd 
   1484  1.142    dyoung 	case SO_DEBUG:
   1485  1.142    dyoung 	case SO_KEEPALIVE:
   1486  1.142    dyoung 	case SO_DONTROUTE:
   1487  1.142    dyoung 	case SO_USELOOPBACK:
   1488  1.142    dyoung 	case SO_BROADCAST:
   1489  1.142    dyoung 	case SO_REUSEADDR:
   1490  1.142    dyoung 	case SO_REUSEPORT:
   1491  1.142    dyoung 	case SO_OOBINLINE:
   1492  1.142    dyoung 	case SO_TIMESTAMP:
   1493  1.142    dyoung 		if (m == NULL || m->m_len < sizeof(int))
   1494  1.142    dyoung 			return EINVAL;
   1495  1.142    dyoung 		if (*mtod(m, int *))
   1496  1.142    dyoung 			so->so_options |= optname;
   1497  1.142    dyoung 		else
   1498  1.142    dyoung 			so->so_options &= ~optname;
   1499  1.142    dyoung 		break;
   1500  1.142    dyoung 
   1501  1.142    dyoung 	case SO_SNDBUF:
   1502  1.142    dyoung 	case SO_RCVBUF:
   1503  1.142    dyoung 	case SO_SNDLOWAT:
   1504  1.142    dyoung 	case SO_RCVLOWAT:
   1505  1.142    dyoung 		if (m == NULL || m->m_len < sizeof(int))
   1506  1.142    dyoung 			return EINVAL;
   1507    1.1       cgd 
   1508  1.142    dyoung 		/*
   1509  1.142    dyoung 		 * Values < 1 make no sense for any of these
   1510  1.142    dyoung 		 * options, so disallow them.
   1511  1.142    dyoung 		 */
   1512  1.142    dyoung 		optval = *mtod(m, int *);
   1513  1.142    dyoung 		if (optval < 1)
   1514  1.142    dyoung 			return EINVAL;
   1515    1.1       cgd 
   1516  1.142    dyoung 		switch (optname) {
   1517    1.1       cgd 
   1518    1.1       cgd 		case SO_SNDBUF:
   1519    1.1       cgd 		case SO_RCVBUF:
   1520  1.142    dyoung 			sb = (optname == SO_SNDBUF) ?
   1521  1.142    dyoung 			    &so->so_snd : &so->so_rcv;
   1522  1.142    dyoung 			if (sbreserve(sb, (u_long)optval, so) == 0)
   1523  1.142    dyoung 				return ENOBUFS;
   1524  1.142    dyoung 			sb->sb_flags &= ~SB_AUTOSIZE;
   1525  1.142    dyoung 			break;
   1526  1.142    dyoung 
   1527  1.142    dyoung 		/*
   1528  1.142    dyoung 		 * Make sure the low-water is never greater than
   1529  1.142    dyoung 		 * the high-water.
   1530  1.142    dyoung 		 */
   1531    1.1       cgd 		case SO_SNDLOWAT:
   1532  1.142    dyoung 			so->so_snd.sb_lowat =
   1533  1.142    dyoung 			    (optval > so->so_snd.sb_hiwat) ?
   1534  1.142    dyoung 			    so->so_snd.sb_hiwat : optval;
   1535  1.142    dyoung 			break;
   1536    1.1       cgd 		case SO_RCVLOWAT:
   1537  1.142    dyoung 			so->so_rcv.sb_lowat =
   1538  1.142    dyoung 			    (optval > so->so_rcv.sb_hiwat) ?
   1539  1.142    dyoung 			    so->so_rcv.sb_hiwat : optval;
   1540  1.142    dyoung 			break;
   1541  1.142    dyoung 		}
   1542  1.142    dyoung 		break;
   1543   1.28   thorpej 
   1544  1.142    dyoung 	case SO_SNDTIMEO:
   1545  1.142    dyoung 	case SO_RCVTIMEO:
   1546  1.142    dyoung 		if (m == NULL || m->m_len < sizeof(*tv))
   1547  1.142    dyoung 			return EINVAL;
   1548  1.142    dyoung 		tv = mtod(m, struct timeval *);
   1549  1.142    dyoung 		if (tv->tv_sec > (INT_MAX - tv->tv_usec / tick) / hz)
   1550  1.142    dyoung 			return EDOM;
   1551  1.142    dyoung 		val = tv->tv_sec * hz + tv->tv_usec / tick;
   1552  1.142    dyoung 		if (val == 0 && tv->tv_usec != 0)
   1553  1.142    dyoung 			val = 1;
   1554   1.28   thorpej 
   1555  1.142    dyoung 		switch (optname) {
   1556   1.28   thorpej 
   1557  1.142    dyoung 		case SO_SNDTIMEO:
   1558  1.142    dyoung 			so->so_snd.sb_timeo = val;
   1559    1.1       cgd 			break;
   1560    1.1       cgd 		case SO_RCVTIMEO:
   1561  1.142    dyoung 			so->so_rcv.sb_timeo = val;
   1562  1.142    dyoung 			break;
   1563  1.142    dyoung 		}
   1564  1.142    dyoung 		break;
   1565    1.1       cgd 
   1566  1.142    dyoung 	default:
   1567  1.142    dyoung 		return ENOPROTOOPT;
   1568  1.142    dyoung 	}
   1569  1.142    dyoung 	return 0;
   1570  1.142    dyoung }
   1571    1.1       cgd 
   1572  1.142    dyoung int
   1573  1.142    dyoung sosetopt(struct socket *so, int level, int optname, struct mbuf *m)
   1574  1.142    dyoung {
   1575  1.142    dyoung 	int error, prerr;
   1576    1.1       cgd 
   1577  1.142    dyoung 	if (level == SOL_SOCKET)
   1578  1.142    dyoung 		error = sosetopt1(so, level, optname, m);
   1579  1.142    dyoung 	else
   1580  1.142    dyoung 		error = ENOPROTOOPT;
   1581    1.1       cgd 
   1582  1.142    dyoung 	if ((error == 0 || error == ENOPROTOOPT) &&
   1583  1.142    dyoung 	    so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
   1584  1.142    dyoung 		/* give the protocol stack a shot */
   1585  1.142    dyoung 		prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, level,
   1586  1.142    dyoung 		    optname, &m);
   1587  1.142    dyoung 		if (prerr == 0)
   1588  1.142    dyoung 			error = 0;
   1589  1.142    dyoung 		else if (prerr != ENOPROTOOPT)
   1590  1.142    dyoung 			error = prerr;
   1591  1.142    dyoung 	} else if (m != NULL)
   1592  1.142    dyoung 		(void)m_free(m);
   1593  1.142    dyoung 	return error;
   1594    1.1       cgd }
   1595    1.1       cgd 
   1596   1.14   mycroft int
   1597   1.54     lukem sogetopt(struct socket *so, int level, int optname, struct mbuf **mp)
   1598    1.1       cgd {
   1599   1.54     lukem 	struct mbuf	*m;
   1600    1.1       cgd 
   1601    1.1       cgd 	if (level != SOL_SOCKET) {
   1602    1.1       cgd 		if (so->so_proto && so->so_proto->pr_ctloutput) {
   1603    1.1       cgd 			return ((*so->so_proto->pr_ctloutput)
   1604    1.1       cgd 				  (PRCO_GETOPT, so, level, optname, mp));
   1605    1.1       cgd 		} else
   1606    1.1       cgd 			return (ENOPROTOOPT);
   1607    1.1       cgd 	} else {
   1608    1.1       cgd 		m = m_get(M_WAIT, MT_SOOPTS);
   1609   1.36     perry 		m->m_len = sizeof(int);
   1610    1.1       cgd 
   1611    1.1       cgd 		switch (optname) {
   1612    1.1       cgd 
   1613    1.1       cgd 		case SO_LINGER:
   1614   1.36     perry 			m->m_len = sizeof(struct linger);
   1615    1.1       cgd 			mtod(m, struct linger *)->l_onoff =
   1616  1.131  christos 			    (so->so_options & SO_LINGER) ? 1 : 0;
   1617    1.1       cgd 			mtod(m, struct linger *)->l_linger = so->so_linger;
   1618    1.1       cgd 			break;
   1619    1.1       cgd 
   1620    1.1       cgd 		case SO_USELOOPBACK:
   1621    1.1       cgd 		case SO_DONTROUTE:
   1622    1.1       cgd 		case SO_DEBUG:
   1623    1.1       cgd 		case SO_KEEPALIVE:
   1624    1.1       cgd 		case SO_REUSEADDR:
   1625   1.15   mycroft 		case SO_REUSEPORT:
   1626    1.1       cgd 		case SO_BROADCAST:
   1627    1.1       cgd 		case SO_OOBINLINE:
   1628   1.26   thorpej 		case SO_TIMESTAMP:
   1629  1.131  christos 			*mtod(m, int *) = (so->so_options & optname) ? 1 : 0;
   1630    1.1       cgd 			break;
   1631    1.1       cgd 
   1632    1.1       cgd 		case SO_TYPE:
   1633    1.1       cgd 			*mtod(m, int *) = so->so_type;
   1634    1.1       cgd 			break;
   1635    1.1       cgd 
   1636    1.1       cgd 		case SO_ERROR:
   1637    1.1       cgd 			*mtod(m, int *) = so->so_error;
   1638    1.1       cgd 			so->so_error = 0;
   1639    1.1       cgd 			break;
   1640    1.1       cgd 
   1641    1.1       cgd 		case SO_SNDBUF:
   1642    1.1       cgd 			*mtod(m, int *) = so->so_snd.sb_hiwat;
   1643    1.1       cgd 			break;
   1644    1.1       cgd 
   1645    1.1       cgd 		case SO_RCVBUF:
   1646    1.1       cgd 			*mtod(m, int *) = so->so_rcv.sb_hiwat;
   1647    1.1       cgd 			break;
   1648    1.1       cgd 
   1649    1.1       cgd 		case SO_SNDLOWAT:
   1650    1.1       cgd 			*mtod(m, int *) = so->so_snd.sb_lowat;
   1651    1.1       cgd 			break;
   1652    1.1       cgd 
   1653    1.1       cgd 		case SO_RCVLOWAT:
   1654    1.1       cgd 			*mtod(m, int *) = so->so_rcv.sb_lowat;
   1655    1.1       cgd 			break;
   1656    1.1       cgd 
   1657    1.1       cgd 		case SO_SNDTIMEO:
   1658    1.1       cgd 		case SO_RCVTIMEO:
   1659    1.1       cgd 		    {
   1660    1.1       cgd 			int val = (optname == SO_SNDTIMEO ?
   1661    1.1       cgd 			     so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
   1662    1.1       cgd 
   1663    1.1       cgd 			m->m_len = sizeof(struct timeval);
   1664    1.1       cgd 			mtod(m, struct timeval *)->tv_sec = val / hz;
   1665    1.1       cgd 			mtod(m, struct timeval *)->tv_usec =
   1666   1.27    kleink 			    (val % hz) * tick;
   1667    1.1       cgd 			break;
   1668    1.1       cgd 		    }
   1669    1.1       cgd 
   1670  1.107   darrenr 		case SO_OVERFLOWED:
   1671  1.107   darrenr 			*mtod(m, int *) = so->so_rcv.sb_overflowed;
   1672  1.107   darrenr 			break;
   1673  1.107   darrenr 
   1674    1.1       cgd 		default:
   1675    1.1       cgd 			(void)m_free(m);
   1676    1.1       cgd 			return (ENOPROTOOPT);
   1677    1.1       cgd 		}
   1678    1.1       cgd 		*mp = m;
   1679    1.1       cgd 		return (0);
   1680    1.1       cgd 	}
   1681    1.1       cgd }
   1682    1.1       cgd 
   1683   1.14   mycroft void
   1684   1.54     lukem sohasoutofband(struct socket *so)
   1685    1.1       cgd {
   1686   1.90  christos 	fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
   1687    1.2       cgd 	selwakeup(&so->so_rcv.sb_sel);
   1688    1.1       cgd }
   1689   1.72  jdolecek 
   1690   1.72  jdolecek static void
   1691   1.72  jdolecek filt_sordetach(struct knote *kn)
   1692   1.72  jdolecek {
   1693   1.72  jdolecek 	struct socket	*so;
   1694   1.72  jdolecek 
   1695   1.72  jdolecek 	so = (struct socket *)kn->kn_fp->f_data;
   1696   1.73  christos 	SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
   1697   1.73  christos 	if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
   1698   1.72  jdolecek 		so->so_rcv.sb_flags &= ~SB_KNOTE;
   1699   1.72  jdolecek }
   1700   1.72  jdolecek 
   1701   1.72  jdolecek /*ARGSUSED*/
   1702   1.72  jdolecek static int
   1703  1.129      yamt filt_soread(struct knote *kn, long hint)
   1704   1.72  jdolecek {
   1705   1.72  jdolecek 	struct socket	*so;
   1706   1.72  jdolecek 
   1707   1.72  jdolecek 	so = (struct socket *)kn->kn_fp->f_data;
   1708   1.72  jdolecek 	kn->kn_data = so->so_rcv.sb_cc;
   1709   1.72  jdolecek 	if (so->so_state & SS_CANTRCVMORE) {
   1710  1.108     perry 		kn->kn_flags |= EV_EOF;
   1711   1.72  jdolecek 		kn->kn_fflags = so->so_error;
   1712   1.72  jdolecek 		return (1);
   1713   1.72  jdolecek 	}
   1714   1.72  jdolecek 	if (so->so_error)	/* temporary udp error */
   1715   1.72  jdolecek 		return (1);
   1716   1.72  jdolecek 	if (kn->kn_sfflags & NOTE_LOWAT)
   1717   1.72  jdolecek 		return (kn->kn_data >= kn->kn_sdata);
   1718   1.72  jdolecek 	return (kn->kn_data >= so->so_rcv.sb_lowat);
   1719   1.72  jdolecek }
   1720   1.72  jdolecek 
   1721   1.72  jdolecek static void
   1722   1.72  jdolecek filt_sowdetach(struct knote *kn)
   1723   1.72  jdolecek {
   1724   1.72  jdolecek 	struct socket	*so;
   1725   1.72  jdolecek 
   1726   1.72  jdolecek 	so = (struct socket *)kn->kn_fp->f_data;
   1727   1.73  christos 	SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
   1728   1.73  christos 	if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
   1729   1.72  jdolecek 		so->so_snd.sb_flags &= ~SB_KNOTE;
   1730   1.72  jdolecek }
   1731   1.72  jdolecek 
   1732   1.72  jdolecek /*ARGSUSED*/
   1733   1.72  jdolecek static int
   1734  1.129      yamt filt_sowrite(struct knote *kn, long hint)
   1735   1.72  jdolecek {
   1736   1.72  jdolecek 	struct socket	*so;
   1737   1.72  jdolecek 
   1738   1.72  jdolecek 	so = (struct socket *)kn->kn_fp->f_data;
   1739   1.72  jdolecek 	kn->kn_data = sbspace(&so->so_snd);
   1740   1.72  jdolecek 	if (so->so_state & SS_CANTSENDMORE) {
   1741  1.108     perry 		kn->kn_flags |= EV_EOF;
   1742   1.72  jdolecek 		kn->kn_fflags = so->so_error;
   1743   1.72  jdolecek 		return (1);
   1744   1.72  jdolecek 	}
   1745   1.72  jdolecek 	if (so->so_error)	/* temporary udp error */
   1746   1.72  jdolecek 		return (1);
   1747   1.72  jdolecek 	if (((so->so_state & SS_ISCONNECTED) == 0) &&
   1748   1.72  jdolecek 	    (so->so_proto->pr_flags & PR_CONNREQUIRED))
   1749   1.72  jdolecek 		return (0);
   1750   1.72  jdolecek 	if (kn->kn_sfflags & NOTE_LOWAT)
   1751   1.72  jdolecek 		return (kn->kn_data >= kn->kn_sdata);
   1752   1.72  jdolecek 	return (kn->kn_data >= so->so_snd.sb_lowat);
   1753   1.72  jdolecek }
   1754   1.72  jdolecek 
   1755   1.72  jdolecek /*ARGSUSED*/
   1756   1.72  jdolecek static int
   1757  1.129      yamt filt_solisten(struct knote *kn, long hint)
   1758   1.72  jdolecek {
   1759   1.72  jdolecek 	struct socket	*so;
   1760   1.72  jdolecek 
   1761   1.72  jdolecek 	so = (struct socket *)kn->kn_fp->f_data;
   1762   1.72  jdolecek 
   1763   1.72  jdolecek 	/*
   1764   1.72  jdolecek 	 * Set kn_data to number of incoming connections, not
   1765   1.72  jdolecek 	 * counting partial (incomplete) connections.
   1766  1.108     perry 	 */
   1767   1.72  jdolecek 	kn->kn_data = so->so_qlen;
   1768   1.72  jdolecek 	return (kn->kn_data > 0);
   1769   1.72  jdolecek }
   1770   1.72  jdolecek 
   1771   1.72  jdolecek static const struct filterops solisten_filtops =
   1772   1.72  jdolecek 	{ 1, NULL, filt_sordetach, filt_solisten };
   1773   1.72  jdolecek static const struct filterops soread_filtops =
   1774   1.72  jdolecek 	{ 1, NULL, filt_sordetach, filt_soread };
   1775   1.72  jdolecek static const struct filterops sowrite_filtops =
   1776   1.72  jdolecek 	{ 1, NULL, filt_sowdetach, filt_sowrite };
   1777   1.72  jdolecek 
   1778   1.72  jdolecek int
   1779  1.129      yamt soo_kqfilter(struct file *fp, struct knote *kn)
   1780   1.72  jdolecek {
   1781   1.72  jdolecek 	struct socket	*so;
   1782   1.72  jdolecek 	struct sockbuf	*sb;
   1783   1.72  jdolecek 
   1784   1.72  jdolecek 	so = (struct socket *)kn->kn_fp->f_data;
   1785   1.72  jdolecek 	switch (kn->kn_filter) {
   1786   1.72  jdolecek 	case EVFILT_READ:
   1787   1.72  jdolecek 		if (so->so_options & SO_ACCEPTCONN)
   1788   1.72  jdolecek 			kn->kn_fop = &solisten_filtops;
   1789   1.72  jdolecek 		else
   1790   1.72  jdolecek 			kn->kn_fop = &soread_filtops;
   1791   1.72  jdolecek 		sb = &so->so_rcv;
   1792   1.72  jdolecek 		break;
   1793   1.72  jdolecek 	case EVFILT_WRITE:
   1794   1.72  jdolecek 		kn->kn_fop = &sowrite_filtops;
   1795   1.72  jdolecek 		sb = &so->so_snd;
   1796   1.72  jdolecek 		break;
   1797   1.72  jdolecek 	default:
   1798   1.72  jdolecek 		return (1);
   1799   1.72  jdolecek 	}
   1800   1.73  christos 	SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
   1801   1.72  jdolecek 	sb->sb_flags |= SB_KNOTE;
   1802   1.72  jdolecek 	return (0);
   1803   1.72  jdolecek }
   1804   1.72  jdolecek 
   1805   1.94      yamt #include <sys/sysctl.h>
   1806   1.94      yamt 
   1807   1.94      yamt static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
   1808   1.94      yamt 
   1809   1.94      yamt /*
   1810   1.94      yamt  * sysctl helper routine for kern.somaxkva.  ensures that the given
   1811   1.94      yamt  * value is not too small.
   1812   1.94      yamt  * (XXX should we maybe make sure it's not too large as well?)
   1813   1.94      yamt  */
   1814   1.94      yamt static int
   1815   1.94      yamt sysctl_kern_somaxkva(SYSCTLFN_ARGS)
   1816   1.94      yamt {
   1817   1.94      yamt 	int error, new_somaxkva;
   1818   1.94      yamt 	struct sysctlnode node;
   1819   1.94      yamt 
   1820   1.94      yamt 	new_somaxkva = somaxkva;
   1821   1.94      yamt 	node = *rnode;
   1822   1.94      yamt 	node.sysctl_data = &new_somaxkva;
   1823   1.94      yamt 	error = sysctl_lookup(SYSCTLFN_CALL(&node));
   1824   1.94      yamt 	if (error || newp == NULL)
   1825   1.94      yamt 		return (error);
   1826   1.94      yamt 
   1827   1.94      yamt 	if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
   1828   1.94      yamt 		return (EINVAL);
   1829   1.94      yamt 
   1830  1.136        ad 	mutex_enter(&so_pendfree_lock);
   1831   1.94      yamt 	somaxkva = new_somaxkva;
   1832  1.136        ad 	cv_broadcast(&socurkva_cv);
   1833  1.136        ad 	mutex_exit(&so_pendfree_lock);
   1834   1.94      yamt 
   1835   1.94      yamt 	return (error);
   1836   1.94      yamt }
   1837   1.94      yamt 
   1838   1.94      yamt SYSCTL_SETUP(sysctl_kern_somaxkva_setup, "sysctl kern.somaxkva setup")
   1839   1.94      yamt {
   1840   1.94      yamt 
   1841   1.97    atatat 	sysctl_createv(clog, 0, NULL, NULL,
   1842   1.97    atatat 		       CTLFLAG_PERMANENT,
   1843   1.97    atatat 		       CTLTYPE_NODE, "kern", NULL,
   1844   1.97    atatat 		       NULL, 0, NULL, 0,
   1845   1.97    atatat 		       CTL_KERN, CTL_EOL);
   1846   1.97    atatat 
   1847   1.97    atatat 	sysctl_createv(clog, 0, NULL, NULL,
   1848   1.97    atatat 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1849  1.103    atatat 		       CTLTYPE_INT, "somaxkva",
   1850  1.103    atatat 		       SYSCTL_DESCR("Maximum amount of kernel memory to be "
   1851  1.103    atatat 				    "used for socket buffers"),
   1852   1.94      yamt 		       sysctl_kern_somaxkva, 0, NULL, 0,
   1853   1.94      yamt 		       CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
   1854   1.94      yamt }
   1855