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Annotation of src/sys/kern/uipc_socket.c, Revision 1.189

1.189   ! ad          1: /*     $NetBSD: uipc_socket.c,v 1.188 2009/04/04 10:12:51 ad Exp $     */
1.64      thorpej     2:
                      3: /*-
1.188     ad          4:  * Copyright (c) 2002, 2007, 2008, 2009 The NetBSD Foundation, Inc.
1.64      thorpej     5:  * All rights reserved.
                      6:  *
                      7:  * This code is derived from software contributed to The NetBSD Foundation
1.188     ad          8:  * by Jason R. Thorpe of Wasabi Systems, Inc, and by Andrew Doran.
1.64      thorpej     9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     20:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     21:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     22:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     23:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     24:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     25:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     26:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     27:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     28:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     29:  * POSSIBILITY OF SUCH DAMAGE.
                     30:  */
1.16      cgd        31:
1.1       cgd        32: /*
1.159     ad         33:  * Copyright (c) 2004 The FreeBSD Foundation
                     34:  * Copyright (c) 2004 Robert Watson
1.15      mycroft    35:  * Copyright (c) 1982, 1986, 1988, 1990, 1993
                     36:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        37:  *
                     38:  * Redistribution and use in source and binary forms, with or without
                     39:  * modification, are permitted provided that the following conditions
                     40:  * are met:
                     41:  * 1. Redistributions of source code must retain the above copyright
                     42:  *    notice, this list of conditions and the following disclaimer.
                     43:  * 2. Redistributions in binary form must reproduce the above copyright
                     44:  *    notice, this list of conditions and the following disclaimer in the
                     45:  *    documentation and/or other materials provided with the distribution.
1.85      agc        46:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        47:  *    may be used to endorse or promote products derived from this software
                     48:  *    without specific prior written permission.
                     49:  *
                     50:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     51:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     52:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     53:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     54:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     55:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     56:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     57:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     58:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     59:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     60:  * SUCH DAMAGE.
                     61:  *
1.32      fvdl       62:  *     @(#)uipc_socket.c       8.6 (Berkeley) 5/2/95
1.1       cgd        63:  */
1.59      lukem      64:
                     65: #include <sys/cdefs.h>
1.189   ! ad         66: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.188 2009/04/04 10:12:51 ad Exp $");
1.64      thorpej    67:
1.179     christos   68: #include "opt_compat_netbsd.h"
1.64      thorpej    69: #include "opt_sock_counters.h"
                     70: #include "opt_sosend_loan.h"
1.81      martin     71: #include "opt_mbuftrace.h"
1.84      ragge      72: #include "opt_somaxkva.h"
1.167     ad         73: #include "opt_multiprocessor.h"        /* XXX */
1.1       cgd        74:
1.9       mycroft    75: #include <sys/param.h>
                     76: #include <sys/systm.h>
                     77: #include <sys/proc.h>
                     78: #include <sys/file.h>
1.142     dyoung     79: #include <sys/filedesc.h>
1.173     plunky     80: #include <sys/kmem.h>
1.9       mycroft    81: #include <sys/mbuf.h>
                     82: #include <sys/domain.h>
                     83: #include <sys/kernel.h>
                     84: #include <sys/protosw.h>
                     85: #include <sys/socket.h>
                     86: #include <sys/socketvar.h>
1.21      christos   87: #include <sys/signalvar.h>
1.9       mycroft    88: #include <sys/resourcevar.h>
1.174     pooka      89: #include <sys/uidinfo.h>
1.72      jdolecek   90: #include <sys/event.h>
1.89      christos   91: #include <sys/poll.h>
1.118     elad       92: #include <sys/kauth.h>
1.136     ad         93: #include <sys/mutex.h>
                     94: #include <sys/condvar.h>
1.37      thorpej    95:
1.179     christos   96: #ifdef COMPAT_50
                     97: #include <compat/sys/time.h>
1.184     christos   98: #include <compat/sys/socket.h>
1.179     christos   99: #endif
                    100:
1.64      thorpej   101: #include <uvm/uvm.h>
                    102:
1.77      thorpej   103: MALLOC_DEFINE(M_SOOPTS, "soopts", "socket options");
                    104: MALLOC_DEFINE(M_SONAME, "soname", "socket name");
1.37      thorpej   105:
1.142     dyoung    106: extern const struct fileops socketops;
                    107:
1.54      lukem     108: extern int     somaxconn;                      /* patchable (XXX sysctl) */
                    109: int            somaxconn = SOMAXCONN;
1.160     ad        110: kmutex_t       *softnet_lock;
1.49      jonathan  111:
1.64      thorpej   112: #ifdef SOSEND_COUNTERS
                    113: #include <sys/device.h>
                    114:
1.113     thorpej   115: static struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   116:     NULL, "sosend", "loan big");
1.113     thorpej   117: static struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   118:     NULL, "sosend", "copy big");
1.113     thorpej   119: static struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   120:     NULL, "sosend", "copy small");
1.113     thorpej   121: static struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   122:     NULL, "sosend", "kva limit");
                    123:
                    124: #define        SOSEND_COUNTER_INCR(ev)         (ev)->ev_count++
                    125:
1.101     matt      126: EVCNT_ATTACH_STATIC(sosend_loan_big);
                    127: EVCNT_ATTACH_STATIC(sosend_copy_big);
                    128: EVCNT_ATTACH_STATIC(sosend_copy_small);
                    129: EVCNT_ATTACH_STATIC(sosend_kvalimit);
1.64      thorpej   130: #else
                    131:
                    132: #define        SOSEND_COUNTER_INCR(ev)         /* nothing */
                    133:
                    134: #endif /* SOSEND_COUNTERS */
                    135:
1.119     yamt      136: static struct callback_entry sokva_reclaimerentry;
1.1       cgd       137:
1.167     ad        138: #if defined(SOSEND_NO_LOAN) || defined(MULTIPROCESSOR)
1.121     yamt      139: int sock_loan_thresh = -1;
1.71      thorpej   140: #else
1.121     yamt      141: int sock_loan_thresh = 4096;
1.65      thorpej   142: #endif
1.64      thorpej   143:
1.136     ad        144: static kmutex_t so_pendfree_lock;
1.113     thorpej   145: static struct mbuf *so_pendfree;
1.64      thorpej   146:
1.84      ragge     147: #ifndef SOMAXKVA
                    148: #define        SOMAXKVA (16 * 1024 * 1024)
                    149: #endif
                    150: int somaxkva = SOMAXKVA;
1.113     thorpej   151: static int socurkva;
1.136     ad        152: static kcondvar_t socurkva_cv;
1.64      thorpej   153:
                    154: #define        SOCK_LOAN_CHUNK         65536
                    155:
1.117     yamt      156: static size_t sodopendfree(void);
                    157: static size_t sodopendfreel(void);
1.93      yamt      158:
1.178     pooka     159: static void sysctl_kern_somaxkva_setup(void);
                    160: static struct sysctllog *socket_sysctllog;
                    161:
1.113     thorpej   162: static vsize_t
1.129     yamt      163: sokvareserve(struct socket *so, vsize_t len)
1.80      yamt      164: {
1.98      christos  165:        int error;
1.80      yamt      166:
1.136     ad        167:        mutex_enter(&so_pendfree_lock);
1.80      yamt      168:        while (socurkva + len > somaxkva) {
1.93      yamt      169:                size_t freed;
                    170:
                    171:                /*
                    172:                 * try to do pendfree.
                    173:                 */
                    174:
1.117     yamt      175:                freed = sodopendfreel();
1.93      yamt      176:
                    177:                /*
                    178:                 * if some kva was freed, try again.
                    179:                 */
                    180:
                    181:                if (freed)
1.80      yamt      182:                        continue;
1.93      yamt      183:
1.80      yamt      184:                SOSEND_COUNTER_INCR(&sosend_kvalimit);
1.136     ad        185:                error = cv_wait_sig(&socurkva_cv, &so_pendfree_lock);
1.98      christos  186:                if (error) {
                    187:                        len = 0;
                    188:                        break;
                    189:                }
1.80      yamt      190:        }
1.93      yamt      191:        socurkva += len;
1.136     ad        192:        mutex_exit(&so_pendfree_lock);
1.98      christos  193:        return len;
1.95      yamt      194: }
                    195:
1.113     thorpej   196: static void
1.95      yamt      197: sokvaunreserve(vsize_t len)
                    198: {
                    199:
1.136     ad        200:        mutex_enter(&so_pendfree_lock);
1.95      yamt      201:        socurkva -= len;
1.136     ad        202:        cv_broadcast(&socurkva_cv);
                    203:        mutex_exit(&so_pendfree_lock);
1.95      yamt      204: }
                    205:
                    206: /*
                    207:  * sokvaalloc: allocate kva for loan.
                    208:  */
                    209:
                    210: vaddr_t
                    211: sokvaalloc(vsize_t len, struct socket *so)
                    212: {
                    213:        vaddr_t lva;
                    214:
                    215:        /*
                    216:         * reserve kva.
                    217:         */
                    218:
1.98      christos  219:        if (sokvareserve(so, len) == 0)
                    220:                return 0;
1.93      yamt      221:
                    222:        /*
                    223:         * allocate kva.
                    224:         */
1.80      yamt      225:
1.109     yamt      226:        lva = uvm_km_alloc(kernel_map, len, 0, UVM_KMF_VAONLY | UVM_KMF_WAITVA);
1.95      yamt      227:        if (lva == 0) {
                    228:                sokvaunreserve(len);
1.80      yamt      229:                return (0);
1.95      yamt      230:        }
1.80      yamt      231:
                    232:        return lva;
                    233: }
                    234:
1.93      yamt      235: /*
                    236:  * sokvafree: free kva for loan.
                    237:  */
                    238:
1.80      yamt      239: void
                    240: sokvafree(vaddr_t sva, vsize_t len)
                    241: {
1.93      yamt      242:
                    243:        /*
                    244:         * free kva.
                    245:         */
1.80      yamt      246:
1.109     yamt      247:        uvm_km_free(kernel_map, sva, len, UVM_KMF_VAONLY);
1.93      yamt      248:
                    249:        /*
                    250:         * unreserve kva.
                    251:         */
                    252:
1.95      yamt      253:        sokvaunreserve(len);
1.80      yamt      254: }
                    255:
1.64      thorpej   256: static void
1.134     christos  257: sodoloanfree(struct vm_page **pgs, void *buf, size_t size)
1.64      thorpej   258: {
1.156     yamt      259:        vaddr_t sva, eva;
1.64      thorpej   260:        vsize_t len;
1.156     yamt      261:        int npgs;
                    262:
                    263:        KASSERT(pgs != NULL);
1.64      thorpej   264:
                    265:        eva = round_page((vaddr_t) buf + size);
                    266:        sva = trunc_page((vaddr_t) buf);
                    267:        len = eva - sva;
                    268:        npgs = len >> PAGE_SHIFT;
                    269:
                    270:        pmap_kremove(sva, len);
                    271:        pmap_update(pmap_kernel());
                    272:        uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE);
1.80      yamt      273:        sokvafree(sva, len);
1.64      thorpej   274: }
                    275:
                    276: static size_t
1.152     matt      277: sodopendfree(void)
1.64      thorpej   278: {
1.93      yamt      279:        size_t rv;
1.64      thorpej   280:
1.160     ad        281:        if (__predict_true(so_pendfree == NULL))
                    282:                return 0;
                    283:
1.136     ad        284:        mutex_enter(&so_pendfree_lock);
1.117     yamt      285:        rv = sodopendfreel();
1.136     ad        286:        mutex_exit(&so_pendfree_lock);
1.93      yamt      287:
                    288:        return rv;
                    289: }
                    290:
                    291: /*
                    292:  * sodopendfreel: free mbufs on "pendfree" list.
1.136     ad        293:  * unlock and relock so_pendfree_lock when freeing mbufs.
1.93      yamt      294:  *
1.136     ad        295:  * => called with so_pendfree_lock held.
1.93      yamt      296:  */
                    297:
                    298: static size_t
1.152     matt      299: sodopendfreel(void)
1.93      yamt      300: {
1.137     ad        301:        struct mbuf *m, *next;
1.93      yamt      302:        size_t rv = 0;
                    303:
1.136     ad        304:        KASSERT(mutex_owned(&so_pendfree_lock));
1.64      thorpej   305:
1.137     ad        306:        while (so_pendfree != NULL) {
1.64      thorpej   307:                m = so_pendfree;
1.93      yamt      308:                so_pendfree = NULL;
1.136     ad        309:                mutex_exit(&so_pendfree_lock);
1.93      yamt      310:
                    311:                for (; m != NULL; m = next) {
                    312:                        next = m->m_next;
1.156     yamt      313:                        KASSERT((~m->m_flags & (M_EXT|M_EXT_PAGES)) == 0);
                    314:                        KASSERT(m->m_ext.ext_refcnt == 0);
1.93      yamt      315:
                    316:                        rv += m->m_ext.ext_size;
1.156     yamt      317:                        sodoloanfree(m->m_ext.ext_pgs, m->m_ext.ext_buf,
1.93      yamt      318:                            m->m_ext.ext_size);
1.145     ad        319:                        pool_cache_put(mb_cache, m);
1.93      yamt      320:                }
1.64      thorpej   321:
1.136     ad        322:                mutex_enter(&so_pendfree_lock);
1.64      thorpej   323:        }
                    324:
                    325:        return (rv);
                    326: }
                    327:
1.80      yamt      328: void
1.134     christos  329: soloanfree(struct mbuf *m, void *buf, size_t size, void *arg)
1.64      thorpej   330: {
                    331:
1.156     yamt      332:        KASSERT(m != NULL);
1.64      thorpej   333:
1.93      yamt      334:        /*
                    335:         * postpone freeing mbuf.
                    336:         *
                    337:         * we can't do it in interrupt context
                    338:         * because we need to put kva back to kernel_map.
                    339:         */
                    340:
1.136     ad        341:        mutex_enter(&so_pendfree_lock);
1.92      yamt      342:        m->m_next = so_pendfree;
                    343:        so_pendfree = m;
1.136     ad        344:        cv_broadcast(&socurkva_cv);
                    345:        mutex_exit(&so_pendfree_lock);
1.64      thorpej   346: }
                    347:
                    348: static long
                    349: sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space)
                    350: {
                    351:        struct iovec *iov = uio->uio_iov;
                    352:        vaddr_t sva, eva;
                    353:        vsize_t len;
1.156     yamt      354:        vaddr_t lva;
                    355:        int npgs, error;
                    356:        vaddr_t va;
                    357:        int i;
1.64      thorpej   358:
1.116     yamt      359:        if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace))
1.64      thorpej   360:                return (0);
                    361:
                    362:        if (iov->iov_len < (size_t) space)
                    363:                space = iov->iov_len;
                    364:        if (space > SOCK_LOAN_CHUNK)
                    365:                space = SOCK_LOAN_CHUNK;
                    366:
                    367:        eva = round_page((vaddr_t) iov->iov_base + space);
                    368:        sva = trunc_page((vaddr_t) iov->iov_base);
                    369:        len = eva - sva;
                    370:        npgs = len >> PAGE_SHIFT;
                    371:
1.79      thorpej   372:        KASSERT(npgs <= M_EXT_MAXPAGES);
                    373:
1.80      yamt      374:        lva = sokvaalloc(len, so);
1.64      thorpej   375:        if (lva == 0)
1.80      yamt      376:                return 0;
1.64      thorpej   377:
1.116     yamt      378:        error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len,
1.79      thorpej   379:            m->m_ext.ext_pgs, UVM_LOAN_TOPAGE);
1.64      thorpej   380:        if (error) {
1.80      yamt      381:                sokvafree(lva, len);
1.64      thorpej   382:                return (0);
                    383:        }
                    384:
                    385:        for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE)
1.79      thorpej   386:                pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]),
                    387:                    VM_PROT_READ);
1.64      thorpej   388:        pmap_update(pmap_kernel());
                    389:
                    390:        lva += (vaddr_t) iov->iov_base & PAGE_MASK;
                    391:
1.134     christos  392:        MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so);
1.79      thorpej   393:        m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP;
1.64      thorpej   394:
                    395:        uio->uio_resid -= space;
                    396:        /* uio_offset not updated, not set/used for write(2) */
1.134     christos  397:        uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space;
1.64      thorpej   398:        uio->uio_iov->iov_len -= space;
                    399:        if (uio->uio_iov->iov_len == 0) {
                    400:                uio->uio_iov++;
                    401:                uio->uio_iovcnt--;
                    402:        }
                    403:
                    404:        return (space);
                    405: }
                    406:
1.119     yamt      407: static int
1.129     yamt      408: sokva_reclaim_callback(struct callback_entry *ce, void *obj, void *arg)
1.119     yamt      409: {
                    410:
                    411:        KASSERT(ce == &sokva_reclaimerentry);
                    412:        KASSERT(obj == NULL);
                    413:
                    414:        sodopendfree();
                    415:        if (!vm_map_starved_p(kernel_map)) {
                    416:                return CALLBACK_CHAIN_ABORT;
                    417:        }
                    418:        return CALLBACK_CHAIN_CONTINUE;
                    419: }
                    420:
1.142     dyoung    421: struct mbuf *
1.147     dyoung    422: getsombuf(struct socket *so, int type)
1.142     dyoung    423: {
                    424:        struct mbuf *m;
                    425:
1.147     dyoung    426:        m = m_get(M_WAIT, type);
1.142     dyoung    427:        MCLAIM(m, so->so_mowner);
                    428:        return m;
                    429: }
                    430:
1.119     yamt      431: void
                    432: soinit(void)
                    433: {
                    434:
1.178     pooka     435:        sysctl_kern_somaxkva_setup();
                    436:
1.148     ad        437:        mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM);
1.160     ad        438:        softnet_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
1.136     ad        439:        cv_init(&socurkva_cv, "sokva");
1.166     ad        440:        soinit2();
1.136     ad        441:
1.119     yamt      442:        /* Set the initial adjusted socket buffer size. */
                    443:        if (sb_max_set(sb_max))
                    444:                panic("bad initial sb_max value: %lu", sb_max);
                    445:
                    446:        callback_register(&vm_map_to_kernel(kernel_map)->vmk_reclaim_callback,
                    447:            &sokva_reclaimerentry, NULL, sokva_reclaim_callback);
                    448: }
                    449:
1.1       cgd       450: /*
                    451:  * Socket operation routines.
                    452:  * These routines are called by the routines in
                    453:  * sys_socket.c or from a system process, and
                    454:  * implement the semantics of socket operations by
                    455:  * switching out to the protocol specific routines.
                    456:  */
                    457: /*ARGSUSED*/
1.3       andrew    458: int
1.160     ad        459: socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l,
                    460:         struct socket *lockso)
1.1       cgd       461: {
1.99      matt      462:        const struct protosw    *prp;
1.54      lukem     463:        struct socket   *so;
1.115     yamt      464:        uid_t           uid;
1.160     ad        465:        int             error;
                    466:        kmutex_t        *lock;
1.1       cgd       467:
1.132     elad      468:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET,
                    469:            KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type),
                    470:            KAUTH_ARG(proto));
1.140     dyoung    471:        if (error != 0)
                    472:                return error;
1.127     elad      473:
1.1       cgd       474:        if (proto)
                    475:                prp = pffindproto(dom, proto, type);
                    476:        else
                    477:                prp = pffindtype(dom, type);
1.140     dyoung    478:        if (prp == NULL) {
1.120     ginsbach  479:                /* no support for domain */
                    480:                if (pffinddomain(dom) == 0)
1.140     dyoung    481:                        return EAFNOSUPPORT;
1.120     ginsbach  482:                /* no support for socket type */
                    483:                if (proto == 0 && type != 0)
1.140     dyoung    484:                        return EPROTOTYPE;
                    485:                return EPROTONOSUPPORT;
1.120     ginsbach  486:        }
1.140     dyoung    487:        if (prp->pr_usrreq == NULL)
                    488:                return EPROTONOSUPPORT;
1.1       cgd       489:        if (prp->pr_type != type)
1.140     dyoung    490:                return EPROTOTYPE;
1.160     ad        491:
                    492:        so = soget(true);
1.1       cgd       493:        so->so_type = type;
                    494:        so->so_proto = prp;
1.33      matt      495:        so->so_send = sosend;
                    496:        so->so_receive = soreceive;
1.78      matt      497: #ifdef MBUFTRACE
                    498:        so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner;
                    499:        so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner;
                    500:        so->so_mowner = &prp->pr_domain->dom_mowner;
                    501: #endif
1.138     rmind     502:        uid = kauth_cred_geteuid(l->l_cred);
1.115     yamt      503:        so->so_uidinfo = uid_find(uid);
1.168     yamt      504:        so->so_egid = kauth_cred_getegid(l->l_cred);
                    505:        so->so_cpid = l->l_proc->p_pid;
1.160     ad        506:        if (lockso != NULL) {
                    507:                /* Caller wants us to share a lock. */
                    508:                lock = lockso->so_lock;
                    509:                so->so_lock = lock;
                    510:                mutex_obj_hold(lock);
                    511:                mutex_enter(lock);
                    512:        } else {
                    513:                /* Lock assigned and taken during PRU_ATTACH. */
                    514:        }
1.140     dyoung    515:        error = (*prp->pr_usrreq)(so, PRU_ATTACH, NULL,
                    516:            (struct mbuf *)(long)proto, NULL, l);
1.160     ad        517:        KASSERT(solocked(so));
1.140     dyoung    518:        if (error != 0) {
1.1       cgd       519:                so->so_state |= SS_NOFDREF;
                    520:                sofree(so);
1.140     dyoung    521:                return error;
1.1       cgd       522:        }
1.160     ad        523:        sounlock(so);
1.1       cgd       524:        *aso = so;
1.140     dyoung    525:        return 0;
1.1       cgd       526: }
                    527:
1.142     dyoung    528: /* On success, write file descriptor to fdout and return zero.  On
                    529:  * failure, return non-zero; *fdout will be undefined.
                    530:  */
                    531: int
                    532: fsocreate(int domain, struct socket **sop, int type, int protocol,
                    533:     struct lwp *l, int *fdout)
                    534: {
                    535:        struct socket   *so;
                    536:        struct file     *fp;
                    537:        int             fd, error;
                    538:
1.155     ad        539:        if ((error = fd_allocfile(&fp, &fd)) != 0)
1.142     dyoung    540:                return (error);
                    541:        fp->f_flag = FREAD|FWRITE;
                    542:        fp->f_type = DTYPE_SOCKET;
                    543:        fp->f_ops = &socketops;
1.160     ad        544:        error = socreate(domain, &so, type, protocol, l, NULL);
1.142     dyoung    545:        if (error != 0) {
1.155     ad        546:                fd_abort(curproc, fp, fd);
1.142     dyoung    547:        } else {
                    548:                if (sop != NULL)
                    549:                        *sop = so;
                    550:                fp->f_data = so;
1.155     ad        551:                fd_affix(curproc, fp, fd);
1.142     dyoung    552:                *fdout = fd;
                    553:        }
                    554:        return error;
                    555: }
                    556:
1.3       andrew    557: int
1.114     christos  558: sobind(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1       cgd       559: {
1.160     ad        560:        int     error;
1.1       cgd       561:
1.160     ad        562:        solock(so);
1.140     dyoung    563:        error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, NULL, nam, NULL, l);
1.160     ad        564:        sounlock(so);
1.140     dyoung    565:        return error;
1.1       cgd       566: }
                    567:
1.3       andrew    568: int
1.150     elad      569: solisten(struct socket *so, int backlog, struct lwp *l)
1.1       cgd       570: {
1.160     ad        571:        int     error;
1.1       cgd       572:
1.160     ad        573:        solock(so);
1.158     ad        574:        if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163     ad        575:            SS_ISDISCONNECTING)) != 0) {
                    576:                sounlock(so);
1.158     ad        577:                return (EOPNOTSUPP);
1.163     ad        578:        }
1.140     dyoung    579:        error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, NULL,
1.150     elad      580:            NULL, NULL, l);
1.140     dyoung    581:        if (error != 0) {
1.160     ad        582:                sounlock(so);
1.140     dyoung    583:                return error;
1.1       cgd       584:        }
1.63      matt      585:        if (TAILQ_EMPTY(&so->so_q))
1.1       cgd       586:                so->so_options |= SO_ACCEPTCONN;
                    587:        if (backlog < 0)
                    588:                backlog = 0;
1.49      jonathan  589:        so->so_qlimit = min(backlog, somaxconn);
1.160     ad        590:        sounlock(so);
1.140     dyoung    591:        return 0;
1.1       cgd       592: }
                    593:
1.21      christos  594: void
1.54      lukem     595: sofree(struct socket *so)
1.1       cgd       596: {
1.161     ad        597:        u_int refs;
1.1       cgd       598:
1.160     ad        599:        KASSERT(solocked(so));
                    600:
                    601:        if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
                    602:                sounlock(so);
1.1       cgd       603:                return;
1.160     ad        604:        }
1.43      mycroft   605:        if (so->so_head) {
                    606:                /*
                    607:                 * We must not decommission a socket that's on the accept(2)
                    608:                 * queue.  If we do, then accept(2) may hang after select(2)
                    609:                 * indicated that the listening socket was ready.
                    610:                 */
1.160     ad        611:                if (!soqremque(so, 0)) {
                    612:                        sounlock(so);
1.43      mycroft   613:                        return;
1.160     ad        614:                }
1.43      mycroft   615:        }
1.98      christos  616:        if (so->so_rcv.sb_hiwat)
1.110     christos  617:                (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98      christos  618:                    RLIM_INFINITY);
                    619:        if (so->so_snd.sb_hiwat)
1.110     christos  620:                (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98      christos  621:                    RLIM_INFINITY);
                    622:        sbrelease(&so->so_snd, so);
1.160     ad        623:        KASSERT(!cv_has_waiters(&so->so_cv));
                    624:        KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
                    625:        KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1       cgd       626:        sorflush(so);
1.161     ad        627:        refs = so->so_aborting; /* XXX */
1.177     ad        628:        /* Remove acccept filter if one is present. */
1.170     tls       629:        if (so->so_accf != NULL)
1.177     ad        630:                (void)accept_filt_clear(so);
1.160     ad        631:        sounlock(so);
1.161     ad        632:        if (refs == 0)          /* XXX */
                    633:                soput(so);
1.1       cgd       634: }
                    635:
                    636: /*
                    637:  * Close a socket on last file table reference removal.
                    638:  * Initiate disconnect if connected.
                    639:  * Free socket when disconnect complete.
                    640:  */
1.3       andrew    641: int
1.54      lukem     642: soclose(struct socket *so)
1.1       cgd       643: {
1.54      lukem     644:        struct socket   *so2;
1.160     ad        645:        int             error;
                    646:        int             error2;
1.1       cgd       647:
1.54      lukem     648:        error = 0;
1.160     ad        649:        solock(so);
1.1       cgd       650:        if (so->so_options & SO_ACCEPTCONN) {
1.172     ad        651:                for (;;) {
                    652:                        if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.160     ad        653:                                KASSERT(solocked2(so, so2));
                    654:                                (void) soqremque(so2, 0);
                    655:                                /* soabort drops the lock. */
                    656:                                (void) soabort(so2);
                    657:                                solock(so);
1.172     ad        658:                                continue;
1.160     ad        659:                        }
1.172     ad        660:                        if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.160     ad        661:                                KASSERT(solocked2(so, so2));
                    662:                                (void) soqremque(so2, 1);
                    663:                                /* soabort drops the lock. */
                    664:                                (void) soabort(so2);
                    665:                                solock(so);
1.172     ad        666:                                continue;
1.160     ad        667:                        }
1.172     ad        668:                        break;
                    669:                }
1.1       cgd       670:        }
                    671:        if (so->so_pcb == 0)
                    672:                goto discard;
                    673:        if (so->so_state & SS_ISCONNECTED) {
                    674:                if ((so->so_state & SS_ISDISCONNECTING) == 0) {
                    675:                        error = sodisconnect(so);
                    676:                        if (error)
                    677:                                goto drop;
                    678:                }
                    679:                if (so->so_options & SO_LINGER) {
1.151     ad        680:                        if ((so->so_state & SS_ISDISCONNECTING) && so->so_nbio)
1.1       cgd       681:                                goto drop;
1.21      christos  682:                        while (so->so_state & SS_ISCONNECTED) {
1.185     yamt      683:                                error = sowait(so, true, so->so_linger * hz);
1.21      christos  684:                                if (error)
1.1       cgd       685:                                        break;
1.21      christos  686:                        }
1.1       cgd       687:                }
                    688:        }
1.54      lukem     689:  drop:
1.1       cgd       690:        if (so->so_pcb) {
1.160     ad        691:                error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
1.140     dyoung    692:                    NULL, NULL, NULL, NULL);
1.1       cgd       693:                if (error == 0)
                    694:                        error = error2;
                    695:        }
1.54      lukem     696:  discard:
1.1       cgd       697:        if (so->so_state & SS_NOFDREF)
                    698:                panic("soclose: NOFDREF");
                    699:        so->so_state |= SS_NOFDREF;
                    700:        sofree(so);
                    701:        return (error);
                    702: }
                    703:
                    704: /*
1.160     ad        705:  * Must be called with the socket locked..  Will return with it unlocked.
1.1       cgd       706:  */
1.3       andrew    707: int
1.54      lukem     708: soabort(struct socket *so)
1.1       cgd       709: {
1.161     ad        710:        u_int refs;
1.139     yamt      711:        int error;
1.160     ad        712:
                    713:        KASSERT(solocked(so));
                    714:        KASSERT(so->so_head == NULL);
1.1       cgd       715:
1.161     ad        716:        so->so_aborting++;              /* XXX */
1.140     dyoung    717:        error = (*so->so_proto->pr_usrreq)(so, PRU_ABORT, NULL,
                    718:            NULL, NULL, NULL);
1.161     ad        719:        refs = --so->so_aborting;       /* XXX */
1.164     drochner  720:        if (error || (refs == 0)) {
1.139     yamt      721:                sofree(so);
1.160     ad        722:        } else {
                    723:                sounlock(so);
1.139     yamt      724:        }
                    725:        return error;
1.1       cgd       726: }
                    727:
1.3       andrew    728: int
1.54      lukem     729: soaccept(struct socket *so, struct mbuf *nam)
1.1       cgd       730: {
1.160     ad        731:        int     error;
                    732:
                    733:        KASSERT(solocked(so));
1.1       cgd       734:
1.54      lukem     735:        error = 0;
1.1       cgd       736:        if ((so->so_state & SS_NOFDREF) == 0)
                    737:                panic("soaccept: !NOFDREF");
                    738:        so->so_state &= ~SS_NOFDREF;
1.55      thorpej   739:        if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
                    740:            (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.41      mycroft   741:                error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT,
1.140     dyoung    742:                    NULL, nam, NULL, NULL);
1.41      mycroft   743:        else
1.53      itojun    744:                error = ECONNABORTED;
1.52      itojun    745:
1.1       cgd       746:        return (error);
                    747: }
                    748:
1.3       andrew    749: int
1.114     christos  750: soconnect(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1       cgd       751: {
1.160     ad        752:        int             error;
                    753:
                    754:        KASSERT(solocked(so));
1.1       cgd       755:
                    756:        if (so->so_options & SO_ACCEPTCONN)
                    757:                return (EOPNOTSUPP);
                    758:        /*
                    759:         * If protocol is connection-based, can only connect once.
                    760:         * Otherwise, if connected, try to disconnect first.
                    761:         * This allows user to disconnect by connecting to, e.g.,
                    762:         * a null address.
                    763:         */
                    764:        if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
                    765:            ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
                    766:            (error = sodisconnect(so))))
                    767:                error = EISCONN;
                    768:        else
                    769:                error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
1.140     dyoung    770:                    NULL, nam, NULL, l);
1.1       cgd       771:        return (error);
                    772: }
                    773:
1.3       andrew    774: int
1.54      lukem     775: soconnect2(struct socket *so1, struct socket *so2)
1.1       cgd       776: {
1.160     ad        777:        int     error;
                    778:
                    779:        KASSERT(solocked2(so1, so2));
1.1       cgd       780:
1.22      mycroft   781:        error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
1.140     dyoung    782:            NULL, (struct mbuf *)so2, NULL, NULL);
1.1       cgd       783:        return (error);
                    784: }
                    785:
1.3       andrew    786: int
1.54      lukem     787: sodisconnect(struct socket *so)
1.1       cgd       788: {
1.160     ad        789:        int     error;
                    790:
                    791:        KASSERT(solocked(so));
1.1       cgd       792:
                    793:        if ((so->so_state & SS_ISCONNECTED) == 0) {
                    794:                error = ENOTCONN;
1.160     ad        795:        } else if (so->so_state & SS_ISDISCONNECTING) {
1.1       cgd       796:                error = EALREADY;
1.160     ad        797:        } else {
                    798:                error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
                    799:                    NULL, NULL, NULL, NULL);
1.1       cgd       800:        }
1.117     yamt      801:        sodopendfree();
1.1       cgd       802:        return (error);
                    803: }
                    804:
1.15      mycroft   805: #define        SBLOCKWAIT(f)   (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1       cgd       806: /*
                    807:  * Send on a socket.
                    808:  * If send must go all at once and message is larger than
                    809:  * send buffering, then hard error.
                    810:  * Lock against other senders.
                    811:  * If must go all at once and not enough room now, then
                    812:  * inform user that this would block and do nothing.
                    813:  * Otherwise, if nonblocking, send as much as possible.
                    814:  * The data to be sent is described by "uio" if nonzero,
                    815:  * otherwise by the mbuf chain "top" (which must be null
                    816:  * if uio is not).  Data provided in mbuf chain must be small
                    817:  * enough to send all at once.
                    818:  *
                    819:  * Returns nonzero on error, timeout or signal; callers
                    820:  * must check for short counts if EINTR/ERESTART are returned.
                    821:  * Data and control buffers are freed on return.
                    822:  */
1.3       andrew    823: int
1.54      lukem     824: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
1.114     christos  825:        struct mbuf *control, int flags, struct lwp *l)
1.1       cgd       826: {
1.54      lukem     827:        struct mbuf     **mp, *m;
1.114     christos  828:        struct proc     *p;
1.58      jdolecek  829:        long            space, len, resid, clen, mlen;
                    830:        int             error, s, dontroute, atomic;
1.54      lukem     831:
1.114     christos  832:        p = l->l_proc;
1.117     yamt      833:        sodopendfree();
1.160     ad        834:        clen = 0;
1.64      thorpej   835:
1.160     ad        836:        /*
                    837:         * solock() provides atomicity of access.  splsoftnet() prevents
                    838:         * protocol processing soft interrupts from interrupting us and
                    839:         * blocking (expensive).
                    840:         */
                    841:        s = splsoftnet();
                    842:        solock(so);
1.54      lukem     843:        atomic = sosendallatonce(so) || top;
1.1       cgd       844:        if (uio)
                    845:                resid = uio->uio_resid;
                    846:        else
                    847:                resid = top->m_pkthdr.len;
1.7       cgd       848:        /*
                    849:         * In theory resid should be unsigned.
                    850:         * However, space must be signed, as it might be less than 0
                    851:         * if we over-committed, and we must use a signed comparison
                    852:         * of space and resid.  On the other hand, a negative resid
                    853:         * causes us to loop sending 0-length segments to the protocol.
                    854:         */
1.29      mycroft   855:        if (resid < 0) {
                    856:                error = EINVAL;
                    857:                goto out;
                    858:        }
1.1       cgd       859:        dontroute =
                    860:            (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
                    861:            (so->so_proto->pr_flags & PR_ATOMIC);
1.165     christos  862:        l->l_ru.ru_msgsnd++;
1.1       cgd       863:        if (control)
                    864:                clen = control->m_len;
1.54      lukem     865:  restart:
1.21      christos  866:        if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1       cgd       867:                goto out;
                    868:        do {
1.160     ad        869:                if (so->so_state & SS_CANTSENDMORE) {
                    870:                        error = EPIPE;
                    871:                        goto release;
                    872:                }
1.48      thorpej   873:                if (so->so_error) {
                    874:                        error = so->so_error;
                    875:                        so->so_error = 0;
                    876:                        goto release;
                    877:                }
1.1       cgd       878:                if ((so->so_state & SS_ISCONNECTED) == 0) {
                    879:                        if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
                    880:                                if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1.160     ad        881:                                    !(resid == 0 && clen != 0)) {
                    882:                                        error = ENOTCONN;
                    883:                                        goto release;
                    884:                                }
                    885:                        } else if (addr == 0) {
                    886:                                error = EDESTADDRREQ;
                    887:                                goto release;
                    888:                        }
1.1       cgd       889:                }
                    890:                space = sbspace(&so->so_snd);
                    891:                if (flags & MSG_OOB)
                    892:                        space += 1024;
1.21      christos  893:                if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160     ad        894:                    clen > so->so_snd.sb_hiwat) {
                    895:                        error = EMSGSIZE;
                    896:                        goto release;
                    897:                }
1.96      mycroft   898:                if (space < resid + clen &&
1.1       cgd       899:                    (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.160     ad        900:                        if (so->so_nbio) {
                    901:                                error = EWOULDBLOCK;
                    902:                                goto release;
                    903:                        }
1.1       cgd       904:                        sbunlock(&so->so_snd);
                    905:                        error = sbwait(&so->so_snd);
                    906:                        if (error)
                    907:                                goto out;
                    908:                        goto restart;
                    909:                }
                    910:                mp = &top;
                    911:                space -= clen;
                    912:                do {
1.45      tv        913:                        if (uio == NULL) {
                    914:                                /*
                    915:                                 * Data is prepackaged in "top".
                    916:                                 */
                    917:                                resid = 0;
                    918:                                if (flags & MSG_EOR)
                    919:                                        top->m_flags |= M_EOR;
                    920:                        } else do {
1.160     ad        921:                                sounlock(so);
                    922:                                splx(s);
1.144     dyoung    923:                                if (top == NULL) {
1.78      matt      924:                                        m = m_gethdr(M_WAIT, MT_DATA);
1.45      tv        925:                                        mlen = MHLEN;
                    926:                                        m->m_pkthdr.len = 0;
1.140     dyoung    927:                                        m->m_pkthdr.rcvif = NULL;
1.45      tv        928:                                } else {
1.78      matt      929:                                        m = m_get(M_WAIT, MT_DATA);
1.45      tv        930:                                        mlen = MLEN;
                    931:                                }
1.78      matt      932:                                MCLAIM(m, so->so_snd.sb_mowner);
1.121     yamt      933:                                if (sock_loan_thresh >= 0 &&
                    934:                                    uio->uio_iov->iov_len >= sock_loan_thresh &&
                    935:                                    space >= sock_loan_thresh &&
1.64      thorpej   936:                                    (len = sosend_loan(so, uio, m,
                    937:                                                       space)) != 0) {
                    938:                                        SOSEND_COUNTER_INCR(&sosend_loan_big);
                    939:                                        space -= len;
                    940:                                        goto have_data;
                    941:                                }
1.45      tv        942:                                if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64      thorpej   943:                                        SOSEND_COUNTER_INCR(&sosend_copy_big);
1.78      matt      944:                                        m_clget(m, M_WAIT);
1.45      tv        945:                                        if ((m->m_flags & M_EXT) == 0)
                    946:                                                goto nopages;
                    947:                                        mlen = MCLBYTES;
                    948:                                        if (atomic && top == 0) {
1.58      jdolecek  949:                                                len = lmin(MCLBYTES - max_hdr,
1.54      lukem     950:                                                    resid);
1.45      tv        951:                                                m->m_data += max_hdr;
                    952:                                        } else
1.58      jdolecek  953:                                                len = lmin(MCLBYTES, resid);
1.45      tv        954:                                        space -= len;
                    955:                                } else {
1.64      thorpej   956:  nopages:
                    957:                                        SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58      jdolecek  958:                                        len = lmin(lmin(mlen, resid), space);
1.45      tv        959:                                        space -= len;
                    960:                                        /*
                    961:                                         * For datagram protocols, leave room
                    962:                                         * for protocol headers in first mbuf.
                    963:                                         */
                    964:                                        if (atomic && top == 0 && len < mlen)
                    965:                                                MH_ALIGN(m, len);
                    966:                                }
1.144     dyoung    967:                                error = uiomove(mtod(m, void *), (int)len, uio);
1.64      thorpej   968:  have_data:
1.45      tv        969:                                resid = uio->uio_resid;
                    970:                                m->m_len = len;
                    971:                                *mp = m;
                    972:                                top->m_pkthdr.len += len;
1.160     ad        973:                                s = splsoftnet();
                    974:                                solock(so);
1.144     dyoung    975:                                if (error != 0)
1.45      tv        976:                                        goto release;
                    977:                                mp = &m->m_next;
                    978:                                if (resid <= 0) {
                    979:                                        if (flags & MSG_EOR)
                    980:                                                top->m_flags |= M_EOR;
                    981:                                        break;
                    982:                                }
                    983:                        } while (space > 0 && atomic);
1.108     perry     984:
1.160     ad        985:                        if (so->so_state & SS_CANTSENDMORE) {
                    986:                                error = EPIPE;
                    987:                                goto release;
                    988:                        }
1.45      tv        989:                        if (dontroute)
                    990:                                so->so_options |= SO_DONTROUTE;
                    991:                        if (resid > 0)
                    992:                                so->so_state |= SS_MORETOCOME;
1.46      sommerfe  993:                        error = (*so->so_proto->pr_usrreq)(so,
                    994:                            (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
1.160     ad        995:                            top, addr, control, curlwp);
1.45      tv        996:                        if (dontroute)
                    997:                                so->so_options &= ~SO_DONTROUTE;
                    998:                        if (resid > 0)
                    999:                                so->so_state &= ~SS_MORETOCOME;
                   1000:                        clen = 0;
1.144     dyoung   1001:                        control = NULL;
                   1002:                        top = NULL;
1.45      tv       1003:                        mp = &top;
1.144     dyoung   1004:                        if (error != 0)
1.1       cgd      1005:                                goto release;
                   1006:                } while (resid && space > 0);
                   1007:        } while (resid);
                   1008:
1.54      lukem    1009:  release:
1.1       cgd      1010:        sbunlock(&so->so_snd);
1.54      lukem    1011:  out:
1.160     ad       1012:        sounlock(so);
                   1013:        splx(s);
1.1       cgd      1014:        if (top)
                   1015:                m_freem(top);
                   1016:        if (control)
                   1017:                m_freem(control);
                   1018:        return (error);
                   1019: }
                   1020:
                   1021: /*
1.159     ad       1022:  * Following replacement or removal of the first mbuf on the first
                   1023:  * mbuf chain of a socket buffer, push necessary state changes back
                   1024:  * into the socket buffer so that other consumers see the values
                   1025:  * consistently.  'nextrecord' is the callers locally stored value of
                   1026:  * the original value of sb->sb_mb->m_nextpkt which must be restored
                   1027:  * when the lead mbuf changes.  NOTE: 'nextrecord' may be NULL.
                   1028:  */
                   1029: static void
                   1030: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
                   1031: {
                   1032:
1.160     ad       1033:        KASSERT(solocked(sb->sb_so));
                   1034:
1.159     ad       1035:        /*
                   1036:         * First, update for the new value of nextrecord.  If necessary,
                   1037:         * make it the first record.
                   1038:         */
                   1039:        if (sb->sb_mb != NULL)
                   1040:                sb->sb_mb->m_nextpkt = nextrecord;
                   1041:        else
                   1042:                sb->sb_mb = nextrecord;
                   1043:
                   1044:         /*
                   1045:          * Now update any dependent socket buffer fields to reflect
                   1046:          * the new state.  This is an inline of SB_EMPTY_FIXUP, with
                   1047:          * the addition of a second clause that takes care of the
                   1048:          * case where sb_mb has been updated, but remains the last
                   1049:          * record.
                   1050:          */
                   1051:         if (sb->sb_mb == NULL) {
                   1052:                 sb->sb_mbtail = NULL;
                   1053:                 sb->sb_lastrecord = NULL;
                   1054:         } else if (sb->sb_mb->m_nextpkt == NULL)
                   1055:                 sb->sb_lastrecord = sb->sb_mb;
                   1056: }
                   1057:
                   1058: /*
1.1       cgd      1059:  * Implement receive operations on a socket.
                   1060:  * We depend on the way that records are added to the sockbuf
                   1061:  * by sbappend*.  In particular, each record (mbufs linked through m_next)
                   1062:  * must begin with an address if the protocol so specifies,
                   1063:  * followed by an optional mbuf or mbufs containing ancillary data,
                   1064:  * and then zero or more mbufs of data.
                   1065:  * In order to avoid blocking network interrupts for the entire time here,
                   1066:  * we splx() while doing the actual copy to user space.
                   1067:  * Although the sockbuf is locked, new data may still be appended,
                   1068:  * and thus we must maintain consistency of the sockbuf during that time.
                   1069:  *
                   1070:  * The caller may receive the data as a single mbuf chain by supplying
                   1071:  * an mbuf **mp0 for use in returning the chain.  The uio is then used
                   1072:  * only for the count in uio_resid.
                   1073:  */
1.3       andrew   1074: int
1.54      lukem    1075: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
                   1076:        struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1       cgd      1077: {
1.116     yamt     1078:        struct lwp *l = curlwp;
1.160     ad       1079:        struct mbuf     *m, **mp, *mt;
1.146     dyoung   1080:        int atomic, flags, len, error, s, offset, moff, type, orig_resid;
1.99      matt     1081:        const struct protosw    *pr;
1.54      lukem    1082:        struct mbuf     *nextrecord;
1.67      he       1083:        int             mbuf_removed = 0;
1.146     dyoung   1084:        const struct domain *dom;
1.64      thorpej  1085:
1.54      lukem    1086:        pr = so->so_proto;
1.146     dyoung   1087:        atomic = pr->pr_flags & PR_ATOMIC;
                   1088:        dom = pr->pr_domain;
1.1       cgd      1089:        mp = mp0;
1.54      lukem    1090:        type = 0;
                   1091:        orig_resid = uio->uio_resid;
1.102     jonathan 1092:
1.144     dyoung   1093:        if (paddr != NULL)
                   1094:                *paddr = NULL;
                   1095:        if (controlp != NULL)
                   1096:                *controlp = NULL;
                   1097:        if (flagsp != NULL)
1.1       cgd      1098:                flags = *flagsp &~ MSG_EOR;
                   1099:        else
                   1100:                flags = 0;
1.66      enami    1101:
                   1102:        if ((flags & MSG_DONTWAIT) == 0)
1.117     yamt     1103:                sodopendfree();
1.66      enami    1104:
1.1       cgd      1105:        if (flags & MSG_OOB) {
                   1106:                m = m_get(M_WAIT, MT_DATA);
1.160     ad       1107:                solock(so);
1.17      cgd      1108:                error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
1.140     dyoung   1109:                    (struct mbuf *)(long)(flags & MSG_PEEK), NULL, l);
1.160     ad       1110:                sounlock(so);
1.1       cgd      1111:                if (error)
                   1112:                        goto bad;
                   1113:                do {
1.134     christos 1114:                        error = uiomove(mtod(m, void *),
1.1       cgd      1115:                            (int) min(uio->uio_resid, m->m_len), uio);
                   1116:                        m = m_free(m);
1.144     dyoung   1117:                } while (uio->uio_resid > 0 && error == 0 && m);
1.54      lukem    1118:  bad:
1.144     dyoung   1119:                if (m != NULL)
1.1       cgd      1120:                        m_freem(m);
1.144     dyoung   1121:                return error;
1.1       cgd      1122:        }
1.144     dyoung   1123:        if (mp != NULL)
1.140     dyoung   1124:                *mp = NULL;
1.160     ad       1125:
                   1126:        /*
                   1127:         * solock() provides atomicity of access.  splsoftnet() prevents
                   1128:         * protocol processing soft interrupts from interrupting us and
                   1129:         * blocking (expensive).
                   1130:         */
                   1131:        s = splsoftnet();
                   1132:        solock(so);
1.1       cgd      1133:        if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
1.140     dyoung   1134:                (*pr->pr_usrreq)(so, PRU_RCVD, NULL, NULL, NULL, l);
1.1       cgd      1135:
1.54      lukem    1136:  restart:
1.160     ad       1137:        if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
                   1138:                sounlock(so);
                   1139:                splx(s);
1.144     dyoung   1140:                return error;
1.160     ad       1141:        }
1.1       cgd      1142:
                   1143:        m = so->so_rcv.sb_mb;
                   1144:        /*
                   1145:         * If we have less data than requested, block awaiting more
                   1146:         * (subject to any timeout) if:
1.15      mycroft  1147:         *   1. the current count is less than the low water mark,
1.1       cgd      1148:         *   2. MSG_WAITALL is set, and it is possible to do the entire
1.15      mycroft  1149:         *      receive operation at once if we block (resid <= hiwat), or
                   1150:         *   3. MSG_DONTWAIT is not set.
1.1       cgd      1151:         * If MSG_WAITALL is set but resid is larger than the receive buffer,
                   1152:         * we have to do the receive in sections, and thus risk returning
                   1153:         * a short count if a timeout or signal occurs after we start.
                   1154:         */
1.144     dyoung   1155:        if (m == NULL ||
                   1156:            ((flags & MSG_DONTWAIT) == 0 &&
                   1157:             so->so_rcv.sb_cc < uio->uio_resid &&
                   1158:             (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
                   1159:              ((flags & MSG_WAITALL) &&
                   1160:               uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146     dyoung   1161:             m->m_nextpkt == NULL && !atomic)) {
1.1       cgd      1162: #ifdef DIAGNOSTIC
1.144     dyoung   1163:                if (m == NULL && so->so_rcv.sb_cc)
1.1       cgd      1164:                        panic("receive 1");
                   1165: #endif
                   1166:                if (so->so_error) {
1.144     dyoung   1167:                        if (m != NULL)
1.15      mycroft  1168:                                goto dontblock;
1.1       cgd      1169:                        error = so->so_error;
                   1170:                        if ((flags & MSG_PEEK) == 0)
                   1171:                                so->so_error = 0;
                   1172:                        goto release;
                   1173:                }
                   1174:                if (so->so_state & SS_CANTRCVMORE) {
1.144     dyoung   1175:                        if (m != NULL)
1.15      mycroft  1176:                                goto dontblock;
1.1       cgd      1177:                        else
                   1178:                                goto release;
                   1179:                }
1.144     dyoung   1180:                for (; m != NULL; m = m->m_next)
1.1       cgd      1181:                        if (m->m_type == MT_OOBDATA  || (m->m_flags & M_EOR)) {
                   1182:                                m = so->so_rcv.sb_mb;
                   1183:                                goto dontblock;
                   1184:                        }
                   1185:                if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
                   1186:                    (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
                   1187:                        error = ENOTCONN;
                   1188:                        goto release;
                   1189:                }
                   1190:                if (uio->uio_resid == 0)
                   1191:                        goto release;
1.151     ad       1192:                if (so->so_nbio || (flags & MSG_DONTWAIT)) {
1.1       cgd      1193:                        error = EWOULDBLOCK;
                   1194:                        goto release;
                   1195:                }
1.69      thorpej  1196:                SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
                   1197:                SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1       cgd      1198:                sbunlock(&so->so_rcv);
                   1199:                error = sbwait(&so->so_rcv);
1.160     ad       1200:                if (error != 0) {
                   1201:                        sounlock(so);
                   1202:                        splx(s);
1.144     dyoung   1203:                        return error;
1.160     ad       1204:                }
1.1       cgd      1205:                goto restart;
                   1206:        }
1.54      lukem    1207:  dontblock:
1.69      thorpej  1208:        /*
                   1209:         * On entry here, m points to the first record of the socket buffer.
1.159     ad       1210:         * From this point onward, we maintain 'nextrecord' as a cache of the
                   1211:         * pointer to the next record in the socket buffer.  We must keep the
                   1212:         * various socket buffer pointers and local stack versions of the
                   1213:         * pointers in sync, pushing out modifications before dropping the
1.160     ad       1214:         * socket lock, and re-reading them when picking it up.
1.159     ad       1215:         *
                   1216:         * Otherwise, we will race with the network stack appending new data
                   1217:         * or records onto the socket buffer by using inconsistent/stale
                   1218:         * versions of the field, possibly resulting in socket buffer
                   1219:         * corruption.
                   1220:         *
                   1221:         * By holding the high-level sblock(), we prevent simultaneous
                   1222:         * readers from pulling off the front of the socket buffer.
1.69      thorpej  1223:         */
1.144     dyoung   1224:        if (l != NULL)
1.157     ad       1225:                l->l_ru.ru_msgrcv++;
1.69      thorpej  1226:        KASSERT(m == so->so_rcv.sb_mb);
                   1227:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
                   1228:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1       cgd      1229:        nextrecord = m->m_nextpkt;
                   1230:        if (pr->pr_flags & PR_ADDR) {
                   1231: #ifdef DIAGNOSTIC
                   1232:                if (m->m_type != MT_SONAME)
                   1233:                        panic("receive 1a");
                   1234: #endif
1.3       andrew   1235:                orig_resid = 0;
1.1       cgd      1236:                if (flags & MSG_PEEK) {
                   1237:                        if (paddr)
                   1238:                                *paddr = m_copy(m, 0, m->m_len);
                   1239:                        m = m->m_next;
                   1240:                } else {
                   1241:                        sbfree(&so->so_rcv, m);
1.67      he       1242:                        mbuf_removed = 1;
1.144     dyoung   1243:                        if (paddr != NULL) {
1.1       cgd      1244:                                *paddr = m;
                   1245:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1246:                                m->m_next = NULL;
1.1       cgd      1247:                                m = so->so_rcv.sb_mb;
                   1248:                        } else {
                   1249:                                MFREE(m, so->so_rcv.sb_mb);
                   1250:                                m = so->so_rcv.sb_mb;
                   1251:                        }
1.159     ad       1252:                        sbsync(&so->so_rcv, nextrecord);
1.1       cgd      1253:                }
                   1254:        }
1.159     ad       1255:
                   1256:        /*
                   1257:         * Process one or more MT_CONTROL mbufs present before any data mbufs
                   1258:         * in the first mbuf chain on the socket buffer.  If MSG_PEEK, we
                   1259:         * just copy the data; if !MSG_PEEK, we call into the protocol to
                   1260:         * perform externalization (or freeing if controlp == NULL).
                   1261:         */
                   1262:        if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
                   1263:                struct mbuf *cm = NULL, *cmn;
                   1264:                struct mbuf **cme = &cm;
                   1265:
                   1266:                do {
                   1267:                        if (flags & MSG_PEEK) {
                   1268:                                if (controlp != NULL) {
                   1269:                                        *controlp = m_copy(m, 0, m->m_len);
                   1270:                                        controlp = &(*controlp)->m_next;
                   1271:                                }
                   1272:                                m = m->m_next;
                   1273:                        } else {
                   1274:                                sbfree(&so->so_rcv, m);
1.1       cgd      1275:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1276:                                m->m_next = NULL;
1.159     ad       1277:                                *cme = m;
                   1278:                                cme = &(*cme)->m_next;
1.1       cgd      1279:                                m = so->so_rcv.sb_mb;
1.159     ad       1280:                        }
                   1281:                } while (m != NULL && m->m_type == MT_CONTROL);
                   1282:                if ((flags & MSG_PEEK) == 0)
                   1283:                        sbsync(&so->so_rcv, nextrecord);
                   1284:                for (; cm != NULL; cm = cmn) {
                   1285:                        cmn = cm->m_next;
                   1286:                        cm->m_next = NULL;
                   1287:                        type = mtod(cm, struct cmsghdr *)->cmsg_type;
                   1288:                        if (controlp != NULL) {
                   1289:                                if (dom->dom_externalize != NULL &&
                   1290:                                    type == SCM_RIGHTS) {
1.160     ad       1291:                                        sounlock(so);
1.159     ad       1292:                                        splx(s);
                   1293:                                        error = (*dom->dom_externalize)(cm, l);
                   1294:                                        s = splsoftnet();
1.160     ad       1295:                                        solock(so);
1.159     ad       1296:                                }
                   1297:                                *controlp = cm;
                   1298:                                while (*controlp != NULL)
                   1299:                                        controlp = &(*controlp)->m_next;
1.1       cgd      1300:                        } else {
1.106     itojun   1301:                                /*
                   1302:                                 * Dispose of any SCM_RIGHTS message that went
                   1303:                                 * through the read path rather than recv.
                   1304:                                 */
1.159     ad       1305:                                if (dom->dom_dispose != NULL &&
                   1306:                                    type == SCM_RIGHTS) {
1.160     ad       1307:                                        sounlock(so);
1.159     ad       1308:                                        (*dom->dom_dispose)(cm);
1.160     ad       1309:                                        solock(so);
1.159     ad       1310:                                }
                   1311:                                m_freem(cm);
1.1       cgd      1312:                        }
                   1313:                }
1.159     ad       1314:                if (m != NULL)
                   1315:                        nextrecord = so->so_rcv.sb_mb->m_nextpkt;
                   1316:                else
                   1317:                        nextrecord = so->so_rcv.sb_mb;
                   1318:                orig_resid = 0;
1.1       cgd      1319:        }
1.69      thorpej  1320:
1.159     ad       1321:        /* If m is non-NULL, we have some data to read. */
                   1322:        if (__predict_true(m != NULL)) {
1.1       cgd      1323:                type = m->m_type;
                   1324:                if (type == MT_OOBDATA)
                   1325:                        flags |= MSG_OOB;
                   1326:        }
1.69      thorpej  1327:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
                   1328:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
                   1329:
1.1       cgd      1330:        moff = 0;
                   1331:        offset = 0;
1.144     dyoung   1332:        while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1       cgd      1333:                if (m->m_type == MT_OOBDATA) {
                   1334:                        if (type != MT_OOBDATA)
                   1335:                                break;
                   1336:                } else if (type == MT_OOBDATA)
                   1337:                        break;
                   1338: #ifdef DIAGNOSTIC
                   1339:                else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
                   1340:                        panic("receive 3");
                   1341: #endif
                   1342:                so->so_state &= ~SS_RCVATMARK;
                   1343:                len = uio->uio_resid;
                   1344:                if (so->so_oobmark && len > so->so_oobmark - offset)
                   1345:                        len = so->so_oobmark - offset;
                   1346:                if (len > m->m_len - moff)
                   1347:                        len = m->m_len - moff;
                   1348:                /*
                   1349:                 * If mp is set, just pass back the mbufs.
                   1350:                 * Otherwise copy them out via the uio, then free.
                   1351:                 * Sockbuf must be consistent here (points to current mbuf,
                   1352:                 * it points to next record) when we drop priority;
                   1353:                 * we must note any additions to the sockbuf when we
                   1354:                 * block interrupts again.
                   1355:                 */
1.144     dyoung   1356:                if (mp == NULL) {
1.69      thorpej  1357:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
                   1358:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160     ad       1359:                        sounlock(so);
1.1       cgd      1360:                        splx(s);
1.134     christos 1361:                        error = uiomove(mtod(m, char *) + moff, (int)len, uio);
1.20      mycroft  1362:                        s = splsoftnet();
1.160     ad       1363:                        solock(so);
1.144     dyoung   1364:                        if (error != 0) {
1.67      he       1365:                                /*
                   1366:                                 * If any part of the record has been removed
                   1367:                                 * (such as the MT_SONAME mbuf, which will
                   1368:                                 * happen when PR_ADDR, and thus also
                   1369:                                 * PR_ATOMIC, is set), then drop the entire
                   1370:                                 * record to maintain the atomicity of the
                   1371:                                 * receive operation.
                   1372:                                 *
                   1373:                                 * This avoids a later panic("receive 1a")
                   1374:                                 * when compiled with DIAGNOSTIC.
                   1375:                                 */
1.146     dyoung   1376:                                if (m && mbuf_removed && atomic)
1.67      he       1377:                                        (void) sbdroprecord(&so->so_rcv);
                   1378:
1.57      jdolecek 1379:                                goto release;
1.67      he       1380:                        }
1.1       cgd      1381:                } else
                   1382:                        uio->uio_resid -= len;
                   1383:                if (len == m->m_len - moff) {
                   1384:                        if (m->m_flags & M_EOR)
                   1385:                                flags |= MSG_EOR;
                   1386:                        if (flags & MSG_PEEK) {
                   1387:                                m = m->m_next;
                   1388:                                moff = 0;
                   1389:                        } else {
                   1390:                                nextrecord = m->m_nextpkt;
                   1391:                                sbfree(&so->so_rcv, m);
                   1392:                                if (mp) {
                   1393:                                        *mp = m;
                   1394:                                        mp = &m->m_next;
                   1395:                                        so->so_rcv.sb_mb = m = m->m_next;
1.140     dyoung   1396:                                        *mp = NULL;
1.1       cgd      1397:                                } else {
                   1398:                                        MFREE(m, so->so_rcv.sb_mb);
                   1399:                                        m = so->so_rcv.sb_mb;
                   1400:                                }
1.69      thorpej  1401:                                /*
                   1402:                                 * If m != NULL, we also know that
                   1403:                                 * so->so_rcv.sb_mb != NULL.
                   1404:                                 */
                   1405:                                KASSERT(so->so_rcv.sb_mb == m);
                   1406:                                if (m) {
1.1       cgd      1407:                                        m->m_nextpkt = nextrecord;
1.69      thorpej  1408:                                        if (nextrecord == NULL)
                   1409:                                                so->so_rcv.sb_lastrecord = m;
                   1410:                                } else {
                   1411:                                        so->so_rcv.sb_mb = nextrecord;
1.70      thorpej  1412:                                        SB_EMPTY_FIXUP(&so->so_rcv);
1.69      thorpej  1413:                                }
                   1414:                                SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
                   1415:                                SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1       cgd      1416:                        }
1.144     dyoung   1417:                } else if (flags & MSG_PEEK)
                   1418:                        moff += len;
                   1419:                else {
1.160     ad       1420:                        if (mp != NULL) {
                   1421:                                mt = m_copym(m, 0, len, M_NOWAIT);
                   1422:                                if (__predict_false(mt == NULL)) {
                   1423:                                        sounlock(so);
                   1424:                                        mt = m_copym(m, 0, len, M_WAIT);
                   1425:                                        solock(so);
                   1426:                                }
                   1427:                                *mp = mt;
                   1428:                        }
1.144     dyoung   1429:                        m->m_data += len;
                   1430:                        m->m_len -= len;
                   1431:                        so->so_rcv.sb_cc -= len;
1.1       cgd      1432:                }
                   1433:                if (so->so_oobmark) {
                   1434:                        if ((flags & MSG_PEEK) == 0) {
                   1435:                                so->so_oobmark -= len;
                   1436:                                if (so->so_oobmark == 0) {
                   1437:                                        so->so_state |= SS_RCVATMARK;
                   1438:                                        break;
                   1439:                                }
1.7       cgd      1440:                        } else {
1.1       cgd      1441:                                offset += len;
1.7       cgd      1442:                                if (offset == so->so_oobmark)
                   1443:                                        break;
                   1444:                        }
1.1       cgd      1445:                }
                   1446:                if (flags & MSG_EOR)
                   1447:                        break;
                   1448:                /*
                   1449:                 * If the MSG_WAITALL flag is set (for non-atomic socket),
                   1450:                 * we must not quit until "uio->uio_resid == 0" or an error
                   1451:                 * termination.  If a signal/timeout occurs, return
                   1452:                 * with a short count but without error.
                   1453:                 * Keep sockbuf locked against other readers.
                   1454:                 */
1.144     dyoung   1455:                while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3       andrew   1456:                    !sosendallatonce(so) && !nextrecord) {
1.1       cgd      1457:                        if (so->so_error || so->so_state & SS_CANTRCVMORE)
                   1458:                                break;
1.68      matt     1459:                        /*
                   1460:                         * If we are peeking and the socket receive buffer is
                   1461:                         * full, stop since we can't get more data to peek at.
                   1462:                         */
                   1463:                        if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
                   1464:                                break;
                   1465:                        /*
                   1466:                         * If we've drained the socket buffer, tell the
                   1467:                         * protocol in case it needs to do something to
                   1468:                         * get it filled again.
                   1469:                         */
                   1470:                        if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
                   1471:                                (*pr->pr_usrreq)(so, PRU_RCVD,
1.140     dyoung   1472:                                    NULL, (struct mbuf *)(long)flags, NULL, l);
1.69      thorpej  1473:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
                   1474:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.1       cgd      1475:                        error = sbwait(&so->so_rcv);
1.144     dyoung   1476:                        if (error != 0) {
1.1       cgd      1477:                                sbunlock(&so->so_rcv);
1.160     ad       1478:                                sounlock(so);
1.1       cgd      1479:                                splx(s);
1.144     dyoung   1480:                                return 0;
1.1       cgd      1481:                        }
1.21      christos 1482:                        if ((m = so->so_rcv.sb_mb) != NULL)
1.1       cgd      1483:                                nextrecord = m->m_nextpkt;
                   1484:                }
                   1485:        }
1.3       andrew   1486:
1.146     dyoung   1487:        if (m && atomic) {
1.3       andrew   1488:                flags |= MSG_TRUNC;
                   1489:                if ((flags & MSG_PEEK) == 0)
                   1490:                        (void) sbdroprecord(&so->so_rcv);
                   1491:        }
1.1       cgd      1492:        if ((flags & MSG_PEEK) == 0) {
1.144     dyoung   1493:                if (m == NULL) {
1.69      thorpej  1494:                        /*
1.70      thorpej  1495:                         * First part is an inline SB_EMPTY_FIXUP().  Second
1.69      thorpej  1496:                         * part makes sure sb_lastrecord is up-to-date if
                   1497:                         * there is still data in the socket buffer.
                   1498:                         */
1.1       cgd      1499:                        so->so_rcv.sb_mb = nextrecord;
1.69      thorpej  1500:                        if (so->so_rcv.sb_mb == NULL) {
                   1501:                                so->so_rcv.sb_mbtail = NULL;
                   1502:                                so->so_rcv.sb_lastrecord = NULL;
                   1503:                        } else if (nextrecord->m_nextpkt == NULL)
                   1504:                                so->so_rcv.sb_lastrecord = nextrecord;
                   1505:                }
                   1506:                SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
                   1507:                SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1       cgd      1508:                if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.140     dyoung   1509:                        (*pr->pr_usrreq)(so, PRU_RCVD, NULL,
                   1510:                            (struct mbuf *)(long)flags, NULL, l);
1.1       cgd      1511:        }
1.3       andrew   1512:        if (orig_resid == uio->uio_resid && orig_resid &&
                   1513:            (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
                   1514:                sbunlock(&so->so_rcv);
                   1515:                goto restart;
                   1516:        }
1.108     perry    1517:
1.144     dyoung   1518:        if (flagsp != NULL)
1.1       cgd      1519:                *flagsp |= flags;
1.54      lukem    1520:  release:
1.1       cgd      1521:        sbunlock(&so->so_rcv);
1.160     ad       1522:        sounlock(so);
1.1       cgd      1523:        splx(s);
1.144     dyoung   1524:        return error;
1.1       cgd      1525: }
                   1526:
1.14      mycroft  1527: int
1.54      lukem    1528: soshutdown(struct socket *so, int how)
1.1       cgd      1529: {
1.99      matt     1530:        const struct protosw    *pr;
1.160     ad       1531:        int     error;
                   1532:
                   1533:        KASSERT(solocked(so));
1.34      kleink   1534:
1.54      lukem    1535:        pr = so->so_proto;
1.34      kleink   1536:        if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
                   1537:                return (EINVAL);
1.1       cgd      1538:
1.160     ad       1539:        if (how == SHUT_RD || how == SHUT_RDWR) {
1.1       cgd      1540:                sorflush(so);
1.160     ad       1541:                error = 0;
                   1542:        }
1.34      kleink   1543:        if (how == SHUT_WR || how == SHUT_RDWR)
1.160     ad       1544:                error = (*pr->pr_usrreq)(so, PRU_SHUTDOWN, NULL,
1.140     dyoung   1545:                    NULL, NULL, NULL);
1.160     ad       1546:
                   1547:        return error;
1.1       cgd      1548: }
                   1549:
1.188     ad       1550: int
                   1551: sodrain(struct socket *so)
                   1552: {
                   1553:        int error;
                   1554:
                   1555:        solock(so);
                   1556:        so->so_state |= SS_ISDRAINING;
                   1557:        cv_broadcast(&so->so_cv);
                   1558:        error = soshutdown(so, SHUT_RDWR);
                   1559:        sounlock(so);
                   1560:
                   1561:        return error;
                   1562: }
                   1563:
1.14      mycroft  1564: void
1.54      lukem    1565: sorflush(struct socket *so)
1.1       cgd      1566: {
1.54      lukem    1567:        struct sockbuf  *sb, asb;
1.99      matt     1568:        const struct protosw    *pr;
1.160     ad       1569:
                   1570:        KASSERT(solocked(so));
1.1       cgd      1571:
1.54      lukem    1572:        sb = &so->so_rcv;
                   1573:        pr = so->so_proto;
1.160     ad       1574:        socantrcvmore(so);
1.1       cgd      1575:        sb->sb_flags |= SB_NOINTR;
1.160     ad       1576:        (void )sblock(sb, M_WAITOK);
1.1       cgd      1577:        sbunlock(sb);
                   1578:        asb = *sb;
1.86      wrstuden 1579:        /*
                   1580:         * Clear most of the sockbuf structure, but leave some of the
                   1581:         * fields valid.
                   1582:         */
                   1583:        memset(&sb->sb_startzero, 0,
                   1584:            sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160     ad       1585:        if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
                   1586:                sounlock(so);
1.1       cgd      1587:                (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160     ad       1588:                solock(so);
                   1589:        }
1.98      christos 1590:        sbrelease(&asb, so);
1.1       cgd      1591: }
                   1592:
1.171     plunky   1593: /*
                   1594:  * internal set SOL_SOCKET options
                   1595:  */
1.142     dyoung   1596: static int
1.171     plunky   1597: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1       cgd      1598: {
1.182     christos 1599:        int error = EINVAL, optval, opt;
1.171     plunky   1600:        struct linger l;
                   1601:        struct timeval tv;
1.142     dyoung   1602:
1.179     christos 1603:        switch ((opt = sopt->sopt_name)) {
1.142     dyoung   1604:
1.170     tls      1605:        case SO_ACCEPTFILTER:
1.177     ad       1606:                error = accept_filt_setopt(so, sopt);
                   1607:                KASSERT(solocked(so));
1.170     tls      1608:                break;
                   1609:
1.171     plunky   1610:        case SO_LINGER:
                   1611:                error = sockopt_get(sopt, &l, sizeof(l));
1.177     ad       1612:                solock(so);
1.171     plunky   1613:                if (error)
1.177     ad       1614:                        break;
1.171     plunky   1615:                if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1.177     ad       1616:                    l.l_linger > (INT_MAX / hz)) {
                   1617:                        error = EDOM;
                   1618:                        break;
                   1619:                }
1.171     plunky   1620:                so->so_linger = l.l_linger;
                   1621:                if (l.l_onoff)
                   1622:                        so->so_options |= SO_LINGER;
                   1623:                else
                   1624:                        so->so_options &= ~SO_LINGER;
1.177     ad       1625:                break;
1.1       cgd      1626:
1.142     dyoung   1627:        case SO_DEBUG:
                   1628:        case SO_KEEPALIVE:
                   1629:        case SO_DONTROUTE:
                   1630:        case SO_USELOOPBACK:
                   1631:        case SO_BROADCAST:
                   1632:        case SO_REUSEADDR:
                   1633:        case SO_REUSEPORT:
                   1634:        case SO_OOBINLINE:
                   1635:        case SO_TIMESTAMP:
1.184     christos 1636: #ifdef SO_OTIMESTAMP
                   1637:        case SO_OTIMESTAMP:
                   1638: #endif
1.171     plunky   1639:                error = sockopt_getint(sopt, &optval);
1.177     ad       1640:                solock(so);
1.171     plunky   1641:                if (error)
1.177     ad       1642:                        break;
1.171     plunky   1643:                if (optval)
1.179     christos 1644:                        so->so_options |= opt;
1.142     dyoung   1645:                else
1.179     christos 1646:                        so->so_options &= ~opt;
1.142     dyoung   1647:                break;
                   1648:
                   1649:        case SO_SNDBUF:
                   1650:        case SO_RCVBUF:
                   1651:        case SO_SNDLOWAT:
                   1652:        case SO_RCVLOWAT:
1.171     plunky   1653:                error = sockopt_getint(sopt, &optval);
1.177     ad       1654:                solock(so);
1.171     plunky   1655:                if (error)
1.177     ad       1656:                        break;
1.1       cgd      1657:
1.142     dyoung   1658:                /*
                   1659:                 * Values < 1 make no sense for any of these
                   1660:                 * options, so disallow them.
                   1661:                 */
1.177     ad       1662:                if (optval < 1) {
                   1663:                        error = EINVAL;
                   1664:                        break;
                   1665:                }
1.1       cgd      1666:
1.179     christos 1667:                switch (opt) {
1.171     plunky   1668:                case SO_SNDBUF:
1.177     ad       1669:                        if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
                   1670:                                error = ENOBUFS;
                   1671:                                break;
                   1672:                        }
1.171     plunky   1673:                        so->so_snd.sb_flags &= ~SB_AUTOSIZE;
                   1674:                        break;
1.1       cgd      1675:
                   1676:                case SO_RCVBUF:
1.177     ad       1677:                        if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
                   1678:                                error = ENOBUFS;
                   1679:                                break;
                   1680:                        }
1.171     plunky   1681:                        so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142     dyoung   1682:                        break;
                   1683:
                   1684:                /*
                   1685:                 * Make sure the low-water is never greater than
                   1686:                 * the high-water.
                   1687:                 */
1.1       cgd      1688:                case SO_SNDLOWAT:
1.171     plunky   1689:                        if (optval > so->so_snd.sb_hiwat)
                   1690:                                optval = so->so_snd.sb_hiwat;
                   1691:
                   1692:                        so->so_snd.sb_lowat = optval;
1.142     dyoung   1693:                        break;
1.171     plunky   1694:
1.1       cgd      1695:                case SO_RCVLOWAT:
1.171     plunky   1696:                        if (optval > so->so_rcv.sb_hiwat)
                   1697:                                optval = so->so_rcv.sb_hiwat;
                   1698:
                   1699:                        so->so_rcv.sb_lowat = optval;
1.142     dyoung   1700:                        break;
                   1701:                }
                   1702:                break;
1.28      thorpej  1703:
1.179     christos 1704: #ifdef COMPAT_50
                   1705:        case SO_OSNDTIMEO:
                   1706:        case SO_ORCVTIMEO: {
                   1707:                struct timeval50 otv;
                   1708:                error = sockopt_get(sopt, &otv, sizeof(otv));
1.186     pooka    1709:                if (error) {
                   1710:                        solock(so);
1.183     christos 1711:                        break;
1.186     pooka    1712:                }
1.179     christos 1713:                timeval50_to_timeval(&otv, &tv);
                   1714:                opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182     christos 1715:                error = 0;
1.179     christos 1716:                /*FALLTHROUGH*/
                   1717:        }
                   1718: #endif /* COMPAT_50 */
                   1719:
1.142     dyoung   1720:        case SO_SNDTIMEO:
                   1721:        case SO_RCVTIMEO:
1.182     christos 1722:                if (error)
1.179     christos 1723:                        error = sockopt_get(sopt, &tv, sizeof(tv));
1.177     ad       1724:                solock(so);
1.171     plunky   1725:                if (error)
1.177     ad       1726:                        break;
1.171     plunky   1727:
1.177     ad       1728:                if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
                   1729:                        error = EDOM;
                   1730:                        break;
                   1731:                }
1.28      thorpej  1732:
1.171     plunky   1733:                optval = tv.tv_sec * hz + tv.tv_usec / tick;
                   1734:                if (optval == 0 && tv.tv_usec != 0)
                   1735:                        optval = 1;
1.28      thorpej  1736:
1.179     christos 1737:                switch (opt) {
1.142     dyoung   1738:                case SO_SNDTIMEO:
1.171     plunky   1739:                        so->so_snd.sb_timeo = optval;
1.1       cgd      1740:                        break;
                   1741:                case SO_RCVTIMEO:
1.171     plunky   1742:                        so->so_rcv.sb_timeo = optval;
1.142     dyoung   1743:                        break;
                   1744:                }
                   1745:                break;
1.1       cgd      1746:
1.142     dyoung   1747:        default:
1.177     ad       1748:                solock(so);
                   1749:                error = ENOPROTOOPT;
                   1750:                break;
1.142     dyoung   1751:        }
1.177     ad       1752:        KASSERT(solocked(so));
                   1753:        return error;
1.142     dyoung   1754: }
1.1       cgd      1755:
1.142     dyoung   1756: int
1.171     plunky   1757: sosetopt(struct socket *so, struct sockopt *sopt)
1.142     dyoung   1758: {
                   1759:        int error, prerr;
1.1       cgd      1760:
1.177     ad       1761:        if (sopt->sopt_level == SOL_SOCKET) {
1.171     plunky   1762:                error = sosetopt1(so, sopt);
1.177     ad       1763:                KASSERT(solocked(so));
                   1764:        } else {
1.142     dyoung   1765:                error = ENOPROTOOPT;
1.177     ad       1766:                solock(so);
                   1767:        }
1.1       cgd      1768:
1.142     dyoung   1769:        if ((error == 0 || error == ENOPROTOOPT) &&
                   1770:            so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
                   1771:                /* give the protocol stack a shot */
1.171     plunky   1772:                prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142     dyoung   1773:                if (prerr == 0)
                   1774:                        error = 0;
                   1775:                else if (prerr != ENOPROTOOPT)
                   1776:                        error = prerr;
1.171     plunky   1777:        }
1.160     ad       1778:        sounlock(so);
1.142     dyoung   1779:        return error;
1.1       cgd      1780: }
                   1781:
1.171     plunky   1782: /*
                   1783:  * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
                   1784:  */
                   1785: int
                   1786: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
                   1787:     const void *val, size_t valsize)
                   1788: {
                   1789:        struct sockopt sopt;
                   1790:        int error;
                   1791:
                   1792:        KASSERT(valsize == 0 || val != NULL);
                   1793:
                   1794:        sockopt_init(&sopt, level, name, valsize);
                   1795:        sockopt_set(&sopt, val, valsize);
                   1796:
                   1797:        error = sosetopt(so, &sopt);
                   1798:
                   1799:        sockopt_destroy(&sopt);
                   1800:
                   1801:        return error;
                   1802: }
                   1803:
                   1804: /*
                   1805:  * internal get SOL_SOCKET options
                   1806:  */
                   1807: static int
                   1808: sogetopt1(struct socket *so, struct sockopt *sopt)
                   1809: {
1.179     christos 1810:        int error, optval, opt;
1.171     plunky   1811:        struct linger l;
                   1812:        struct timeval tv;
                   1813:
1.179     christos 1814:        switch ((opt = sopt->sopt_name)) {
1.171     plunky   1815:
                   1816:        case SO_ACCEPTFILTER:
1.177     ad       1817:                error = accept_filt_getopt(so, sopt);
1.171     plunky   1818:                break;
                   1819:
                   1820:        case SO_LINGER:
                   1821:                l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
                   1822:                l.l_linger = so->so_linger;
                   1823:
                   1824:                error = sockopt_set(sopt, &l, sizeof(l));
                   1825:                break;
                   1826:
                   1827:        case SO_USELOOPBACK:
                   1828:        case SO_DONTROUTE:
                   1829:        case SO_DEBUG:
                   1830:        case SO_KEEPALIVE:
                   1831:        case SO_REUSEADDR:
                   1832:        case SO_REUSEPORT:
                   1833:        case SO_BROADCAST:
                   1834:        case SO_OOBINLINE:
                   1835:        case SO_TIMESTAMP:
1.184     christos 1836: #ifdef SO_OTIMESTAMP
                   1837:        case SO_OTIMESTAMP:
                   1838: #endif
1.179     christos 1839:                error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171     plunky   1840:                break;
                   1841:
                   1842:        case SO_TYPE:
                   1843:                error = sockopt_setint(sopt, so->so_type);
                   1844:                break;
                   1845:
                   1846:        case SO_ERROR:
                   1847:                error = sockopt_setint(sopt, so->so_error);
                   1848:                so->so_error = 0;
                   1849:                break;
                   1850:
                   1851:        case SO_SNDBUF:
                   1852:                error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
                   1853:                break;
                   1854:
                   1855:        case SO_RCVBUF:
                   1856:                error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
                   1857:                break;
                   1858:
                   1859:        case SO_SNDLOWAT:
                   1860:                error = sockopt_setint(sopt, so->so_snd.sb_lowat);
                   1861:                break;
                   1862:
                   1863:        case SO_RCVLOWAT:
                   1864:                error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
                   1865:                break;
                   1866:
1.179     christos 1867: #ifdef COMPAT_50
                   1868:        case SO_OSNDTIMEO:
                   1869:        case SO_ORCVTIMEO: {
                   1870:                struct timeval50 otv;
                   1871:
                   1872:                optval = (opt == SO_OSNDTIMEO ?
                   1873:                     so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
                   1874:
                   1875:                otv.tv_sec = optval / hz;
                   1876:                otv.tv_usec = (optval % hz) * tick;
                   1877:
                   1878:                error = sockopt_set(sopt, &otv, sizeof(otv));
                   1879:                break;
                   1880:        }
                   1881: #endif /* COMPAT_50 */
                   1882:
1.171     plunky   1883:        case SO_SNDTIMEO:
                   1884:        case SO_RCVTIMEO:
1.179     christos 1885:                optval = (opt == SO_SNDTIMEO ?
1.171     plunky   1886:                     so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
                   1887:
                   1888:                tv.tv_sec = optval / hz;
                   1889:                tv.tv_usec = (optval % hz) * tick;
                   1890:
                   1891:                error = sockopt_set(sopt, &tv, sizeof(tv));
                   1892:                break;
                   1893:
                   1894:        case SO_OVERFLOWED:
                   1895:                error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
                   1896:                break;
                   1897:
                   1898:        default:
                   1899:                error = ENOPROTOOPT;
                   1900:                break;
                   1901:        }
                   1902:
                   1903:        return (error);
                   1904: }
                   1905:
1.14      mycroft  1906: int
1.171     plunky   1907: sogetopt(struct socket *so, struct sockopt *sopt)
1.1       cgd      1908: {
1.160     ad       1909:        int             error;
1.1       cgd      1910:
1.160     ad       1911:        solock(so);
1.171     plunky   1912:        if (sopt->sopt_level != SOL_SOCKET) {
1.1       cgd      1913:                if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160     ad       1914:                        error = ((*so->so_proto->pr_ctloutput)
1.171     plunky   1915:                            (PRCO_GETOPT, so, sopt));
1.1       cgd      1916:                } else
1.160     ad       1917:                        error = (ENOPROTOOPT);
1.1       cgd      1918:        } else {
1.171     plunky   1919:                error = sogetopt1(so, sopt);
                   1920:        }
                   1921:        sounlock(so);
                   1922:        return (error);
                   1923: }
                   1924:
                   1925: /*
                   1926:  * alloc sockopt data buffer buffer
                   1927:  *     - will be released at destroy
                   1928:  */
1.176     plunky   1929: static int
                   1930: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171     plunky   1931: {
                   1932:
                   1933:        KASSERT(sopt->sopt_size == 0);
                   1934:
1.176     plunky   1935:        if (len > sizeof(sopt->sopt_buf)) {
                   1936:                sopt->sopt_data = kmem_zalloc(len, kmflag);
                   1937:                if (sopt->sopt_data == NULL)
                   1938:                        return ENOMEM;
                   1939:        } else
1.171     plunky   1940:                sopt->sopt_data = sopt->sopt_buf;
                   1941:
                   1942:        sopt->sopt_size = len;
1.176     plunky   1943:        return 0;
1.171     plunky   1944: }
                   1945:
                   1946: /*
                   1947:  * initialise sockopt storage
1.176     plunky   1948:  *     - MAY sleep during allocation
1.171     plunky   1949:  */
                   1950: void
                   1951: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
                   1952: {
1.1       cgd      1953:
1.171     plunky   1954:        memset(sopt, 0, sizeof(*sopt));
1.1       cgd      1955:
1.171     plunky   1956:        sopt->sopt_level = level;
                   1957:        sopt->sopt_name = name;
1.176     plunky   1958:        (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171     plunky   1959: }
                   1960:
                   1961: /*
                   1962:  * destroy sockopt storage
                   1963:  *     - will release any held memory references
                   1964:  */
                   1965: void
                   1966: sockopt_destroy(struct sockopt *sopt)
                   1967: {
                   1968:
                   1969:        if (sopt->sopt_data != sopt->sopt_buf)
1.173     plunky   1970:                kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171     plunky   1971:
                   1972:        memset(sopt, 0, sizeof(*sopt));
                   1973: }
                   1974:
                   1975: /*
                   1976:  * set sockopt value
                   1977:  *     - value is copied into sockopt
1.176     plunky   1978:  *     - memory is allocated when necessary, will not sleep
1.171     plunky   1979:  */
                   1980: int
                   1981: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
                   1982: {
1.176     plunky   1983:        int error;
1.171     plunky   1984:
1.176     plunky   1985:        if (sopt->sopt_size == 0) {
                   1986:                error = sockopt_alloc(sopt, len, KM_NOSLEEP);
                   1987:                if (error)
                   1988:                        return error;
                   1989:        }
1.171     plunky   1990:
                   1991:        KASSERT(sopt->sopt_size == len);
                   1992:        memcpy(sopt->sopt_data, buf, len);
                   1993:        return 0;
                   1994: }
                   1995:
                   1996: /*
                   1997:  * common case of set sockopt integer value
                   1998:  */
                   1999: int
                   2000: sockopt_setint(struct sockopt *sopt, int val)
                   2001: {
                   2002:
                   2003:        return sockopt_set(sopt, &val, sizeof(int));
                   2004: }
                   2005:
                   2006: /*
                   2007:  * get sockopt value
                   2008:  *     - correct size must be given
                   2009:  */
                   2010: int
                   2011: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
                   2012: {
1.170     tls      2013:
1.171     plunky   2014:        if (sopt->sopt_size != len)
                   2015:                return EINVAL;
1.1       cgd      2016:
1.171     plunky   2017:        memcpy(buf, sopt->sopt_data, len);
                   2018:        return 0;
                   2019: }
1.1       cgd      2020:
1.171     plunky   2021: /*
                   2022:  * common case of get sockopt integer value
                   2023:  */
                   2024: int
                   2025: sockopt_getint(const struct sockopt *sopt, int *valp)
                   2026: {
1.1       cgd      2027:
1.171     plunky   2028:        return sockopt_get(sopt, valp, sizeof(int));
                   2029: }
1.1       cgd      2030:
1.171     plunky   2031: /*
                   2032:  * set sockopt value from mbuf
                   2033:  *     - ONLY for legacy code
                   2034:  *     - mbuf is released by sockopt
1.176     plunky   2035:  *     - will not sleep
1.171     plunky   2036:  */
                   2037: int
                   2038: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
                   2039: {
                   2040:        size_t len;
1.176     plunky   2041:        int error;
1.1       cgd      2042:
1.171     plunky   2043:        len = m_length(m);
1.1       cgd      2044:
1.176     plunky   2045:        if (sopt->sopt_size == 0) {
                   2046:                error = sockopt_alloc(sopt, len, KM_NOSLEEP);
                   2047:                if (error)
                   2048:                        return error;
                   2049:        }
1.1       cgd      2050:
1.171     plunky   2051:        KASSERT(sopt->sopt_size == len);
                   2052:        m_copydata(m, 0, len, sopt->sopt_data);
                   2053:        m_freem(m);
1.1       cgd      2054:
1.171     plunky   2055:        return 0;
                   2056: }
1.1       cgd      2057:
1.171     plunky   2058: /*
                   2059:  * get sockopt value into mbuf
                   2060:  *     - ONLY for legacy code
                   2061:  *     - mbuf to be released by the caller
1.176     plunky   2062:  *     - will not sleep
1.171     plunky   2063:  */
                   2064: struct mbuf *
                   2065: sockopt_getmbuf(const struct sockopt *sopt)
                   2066: {
                   2067:        struct mbuf *m;
1.107     darrenr  2068:
1.176     plunky   2069:        if (sopt->sopt_size > MCLBYTES)
                   2070:                return NULL;
                   2071:
                   2072:        m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171     plunky   2073:        if (m == NULL)
                   2074:                return NULL;
                   2075:
1.176     plunky   2076:        if (sopt->sopt_size > MLEN) {
                   2077:                MCLGET(m, M_DONTWAIT);
                   2078:                if ((m->m_flags & M_EXT) == 0) {
                   2079:                        m_free(m);
                   2080:                        return NULL;
                   2081:                }
1.1       cgd      2082:        }
1.176     plunky   2083:
                   2084:        memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
                   2085:        m->m_len = sopt->sopt_size;
1.160     ad       2086:
1.171     plunky   2087:        return m;
1.1       cgd      2088: }
                   2089:
1.14      mycroft  2090: void
1.54      lukem    2091: sohasoutofband(struct socket *so)
1.1       cgd      2092: {
1.153     rmind    2093:
1.90      christos 2094:        fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189   ! ad       2095:        selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1       cgd      2096: }
1.72      jdolecek 2097:
                   2098: static void
                   2099: filt_sordetach(struct knote *kn)
                   2100: {
                   2101:        struct socket   *so;
                   2102:
1.155     ad       2103:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2104:        solock(so);
1.73      christos 2105:        SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
                   2106:        if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72      jdolecek 2107:                so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160     ad       2108:        sounlock(so);
1.72      jdolecek 2109: }
                   2110:
                   2111: /*ARGSUSED*/
                   2112: static int
1.129     yamt     2113: filt_soread(struct knote *kn, long hint)
1.72      jdolecek 2114: {
                   2115:        struct socket   *so;
1.160     ad       2116:        int rv;
1.72      jdolecek 2117:
1.155     ad       2118:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2119:        if (hint != NOTE_SUBMIT)
                   2120:                solock(so);
1.72      jdolecek 2121:        kn->kn_data = so->so_rcv.sb_cc;
                   2122:        if (so->so_state & SS_CANTRCVMORE) {
1.108     perry    2123:                kn->kn_flags |= EV_EOF;
1.72      jdolecek 2124:                kn->kn_fflags = so->so_error;
1.160     ad       2125:                rv = 1;
                   2126:        } else if (so->so_error)        /* temporary udp error */
                   2127:                rv = 1;
                   2128:        else if (kn->kn_sfflags & NOTE_LOWAT)
                   2129:                rv = (kn->kn_data >= kn->kn_sdata);
                   2130:        else
                   2131:                rv = (kn->kn_data >= so->so_rcv.sb_lowat);
                   2132:        if (hint != NOTE_SUBMIT)
                   2133:                sounlock(so);
                   2134:        return rv;
1.72      jdolecek 2135: }
                   2136:
                   2137: static void
                   2138: filt_sowdetach(struct knote *kn)
                   2139: {
                   2140:        struct socket   *so;
                   2141:
1.155     ad       2142:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2143:        solock(so);
1.73      christos 2144:        SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
                   2145:        if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72      jdolecek 2146:                so->so_snd.sb_flags &= ~SB_KNOTE;
1.160     ad       2147:        sounlock(so);
1.72      jdolecek 2148: }
                   2149:
                   2150: /*ARGSUSED*/
                   2151: static int
1.129     yamt     2152: filt_sowrite(struct knote *kn, long hint)
1.72      jdolecek 2153: {
                   2154:        struct socket   *so;
1.160     ad       2155:        int rv;
1.72      jdolecek 2156:
1.155     ad       2157:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2158:        if (hint != NOTE_SUBMIT)
                   2159:                solock(so);
1.72      jdolecek 2160:        kn->kn_data = sbspace(&so->so_snd);
                   2161:        if (so->so_state & SS_CANTSENDMORE) {
1.108     perry    2162:                kn->kn_flags |= EV_EOF;
1.72      jdolecek 2163:                kn->kn_fflags = so->so_error;
1.160     ad       2164:                rv = 1;
                   2165:        } else if (so->so_error)        /* temporary udp error */
                   2166:                rv = 1;
                   2167:        else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72      jdolecek 2168:            (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160     ad       2169:                rv = 0;
                   2170:        else if (kn->kn_sfflags & NOTE_LOWAT)
                   2171:                rv = (kn->kn_data >= kn->kn_sdata);
                   2172:        else
                   2173:                rv = (kn->kn_data >= so->so_snd.sb_lowat);
                   2174:        if (hint != NOTE_SUBMIT)
                   2175:                sounlock(so);
                   2176:        return rv;
1.72      jdolecek 2177: }
                   2178:
                   2179: /*ARGSUSED*/
                   2180: static int
1.129     yamt     2181: filt_solisten(struct knote *kn, long hint)
1.72      jdolecek 2182: {
                   2183:        struct socket   *so;
1.160     ad       2184:        int rv;
1.72      jdolecek 2185:
1.155     ad       2186:        so = ((file_t *)kn->kn_obj)->f_data;
1.72      jdolecek 2187:
                   2188:        /*
                   2189:         * Set kn_data to number of incoming connections, not
                   2190:         * counting partial (incomplete) connections.
1.108     perry    2191:         */
1.160     ad       2192:        if (hint != NOTE_SUBMIT)
                   2193:                solock(so);
1.72      jdolecek 2194:        kn->kn_data = so->so_qlen;
1.160     ad       2195:        rv = (kn->kn_data > 0);
                   2196:        if (hint != NOTE_SUBMIT)
                   2197:                sounlock(so);
                   2198:        return rv;
1.72      jdolecek 2199: }
                   2200:
                   2201: static const struct filterops solisten_filtops =
                   2202:        { 1, NULL, filt_sordetach, filt_solisten };
                   2203: static const struct filterops soread_filtops =
                   2204:        { 1, NULL, filt_sordetach, filt_soread };
                   2205: static const struct filterops sowrite_filtops =
                   2206:        { 1, NULL, filt_sowdetach, filt_sowrite };
                   2207:
                   2208: int
1.129     yamt     2209: soo_kqfilter(struct file *fp, struct knote *kn)
1.72      jdolecek 2210: {
                   2211:        struct socket   *so;
                   2212:        struct sockbuf  *sb;
                   2213:
1.155     ad       2214:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2215:        solock(so);
1.72      jdolecek 2216:        switch (kn->kn_filter) {
                   2217:        case EVFILT_READ:
                   2218:                if (so->so_options & SO_ACCEPTCONN)
                   2219:                        kn->kn_fop = &solisten_filtops;
                   2220:                else
                   2221:                        kn->kn_fop = &soread_filtops;
                   2222:                sb = &so->so_rcv;
                   2223:                break;
                   2224:        case EVFILT_WRITE:
                   2225:                kn->kn_fop = &sowrite_filtops;
                   2226:                sb = &so->so_snd;
                   2227:                break;
                   2228:        default:
1.160     ad       2229:                sounlock(so);
1.149     pooka    2230:                return (EINVAL);
1.72      jdolecek 2231:        }
1.73      christos 2232:        SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72      jdolecek 2233:        sb->sb_flags |= SB_KNOTE;
1.160     ad       2234:        sounlock(so);
1.72      jdolecek 2235:        return (0);
                   2236: }
                   2237:
1.154     ad       2238: static int
                   2239: sodopoll(struct socket *so, int events)
                   2240: {
                   2241:        int revents;
                   2242:
                   2243:        revents = 0;
                   2244:
                   2245:        if (events & (POLLIN | POLLRDNORM))
                   2246:                if (soreadable(so))
                   2247:                        revents |= events & (POLLIN | POLLRDNORM);
                   2248:
                   2249:        if (events & (POLLOUT | POLLWRNORM))
                   2250:                if (sowritable(so))
                   2251:                        revents |= events & (POLLOUT | POLLWRNORM);
                   2252:
                   2253:        if (events & (POLLPRI | POLLRDBAND))
                   2254:                if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
                   2255:                        revents |= events & (POLLPRI | POLLRDBAND);
                   2256:
                   2257:        return revents;
                   2258: }
                   2259:
                   2260: int
                   2261: sopoll(struct socket *so, int events)
                   2262: {
                   2263:        int revents = 0;
                   2264:
1.160     ad       2265: #ifndef DIAGNOSTIC
                   2266:        /*
                   2267:         * Do a quick, unlocked check in expectation that the socket
                   2268:         * will be ready for I/O.  Don't do this check if DIAGNOSTIC,
                   2269:         * as the solocked() assertions will fail.
                   2270:         */
1.154     ad       2271:        if ((revents = sodopoll(so, events)) != 0)
                   2272:                return revents;
1.160     ad       2273: #endif
1.154     ad       2274:
1.160     ad       2275:        solock(so);
1.154     ad       2276:        if ((revents = sodopoll(so, events)) == 0) {
                   2277:                if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
                   2278:                        selrecord(curlwp, &so->so_rcv.sb_sel);
1.160     ad       2279:                        so->so_rcv.sb_flags |= SB_NOTIFY;
1.154     ad       2280:                }
                   2281:
                   2282:                if (events & (POLLOUT | POLLWRNORM)) {
                   2283:                        selrecord(curlwp, &so->so_snd.sb_sel);
1.160     ad       2284:                        so->so_snd.sb_flags |= SB_NOTIFY;
1.154     ad       2285:                }
                   2286:        }
1.160     ad       2287:        sounlock(so);
1.154     ad       2288:
                   2289:        return revents;
                   2290: }
                   2291:
                   2292:
1.94      yamt     2293: #include <sys/sysctl.h>
                   2294:
                   2295: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
                   2296:
                   2297: /*
                   2298:  * sysctl helper routine for kern.somaxkva.  ensures that the given
                   2299:  * value is not too small.
                   2300:  * (XXX should we maybe make sure it's not too large as well?)
                   2301:  */
                   2302: static int
                   2303: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
                   2304: {
                   2305:        int error, new_somaxkva;
                   2306:        struct sysctlnode node;
                   2307:
                   2308:        new_somaxkva = somaxkva;
                   2309:        node = *rnode;
                   2310:        node.sysctl_data = &new_somaxkva;
                   2311:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2312:        if (error || newp == NULL)
                   2313:                return (error);
                   2314:
                   2315:        if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
                   2316:                return (EINVAL);
                   2317:
1.136     ad       2318:        mutex_enter(&so_pendfree_lock);
1.94      yamt     2319:        somaxkva = new_somaxkva;
1.136     ad       2320:        cv_broadcast(&socurkva_cv);
                   2321:        mutex_exit(&so_pendfree_lock);
1.94      yamt     2322:
                   2323:        return (error);
                   2324: }
                   2325:
1.178     pooka    2326: static void
1.187     cegger   2327: sysctl_kern_somaxkva_setup(void)
1.94      yamt     2328: {
                   2329:
1.178     pooka    2330:        KASSERT(socket_sysctllog == NULL);
                   2331:        sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97      atatat   2332:                       CTLFLAG_PERMANENT,
                   2333:                       CTLTYPE_NODE, "kern", NULL,
                   2334:                       NULL, 0, NULL, 0,
                   2335:                       CTL_KERN, CTL_EOL);
                   2336:
1.178     pooka    2337:        sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97      atatat   2338:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103     atatat   2339:                       CTLTYPE_INT, "somaxkva",
                   2340:                       SYSCTL_DESCR("Maximum amount of kernel memory to be "
                   2341:                                    "used for socket buffers"),
1.94      yamt     2342:                       sysctl_kern_somaxkva, 0, NULL, 0,
                   2343:                       CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
                   2344: }

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