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Annotation of src/sys/kern/uipc_socket.c, Revision 1.207

1.207   ! christos    1: /*     $NetBSD: uipc_socket.c,v 1.206 2011/12/20 23:56:28 christos 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>
1.207   ! christos   66: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.206 2011/12/20 23:56:28 christos 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>
1.205     bouyer     95: #include <sys/kthread.h>
1.37      thorpej    96:
1.179     christos   97: #ifdef COMPAT_50
                     98: #include <compat/sys/time.h>
1.184     christos   99: #include <compat/sys/socket.h>
1.179     christos  100: #endif
                    101:
1.202     uebayasi  102: #include <uvm/uvm_extern.h>
                    103: #include <uvm/uvm_loan.h>
                    104: #include <uvm/uvm_page.h>
1.64      thorpej   105:
1.77      thorpej   106: MALLOC_DEFINE(M_SOOPTS, "soopts", "socket options");
                    107: MALLOC_DEFINE(M_SONAME, "soname", "socket name");
1.37      thorpej   108:
1.142     dyoung    109: extern const struct fileops socketops;
                    110:
1.54      lukem     111: extern int     somaxconn;                      /* patchable (XXX sysctl) */
                    112: int            somaxconn = SOMAXCONN;
1.160     ad        113: kmutex_t       *softnet_lock;
1.49      jonathan  114:
1.64      thorpej   115: #ifdef SOSEND_COUNTERS
                    116: #include <sys/device.h>
                    117:
1.113     thorpej   118: static struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   119:     NULL, "sosend", "loan big");
1.113     thorpej   120: static struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   121:     NULL, "sosend", "copy big");
1.113     thorpej   122: static struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   123:     NULL, "sosend", "copy small");
1.113     thorpej   124: static struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   125:     NULL, "sosend", "kva limit");
                    126:
                    127: #define        SOSEND_COUNTER_INCR(ev)         (ev)->ev_count++
                    128:
1.101     matt      129: EVCNT_ATTACH_STATIC(sosend_loan_big);
                    130: EVCNT_ATTACH_STATIC(sosend_copy_big);
                    131: EVCNT_ATTACH_STATIC(sosend_copy_small);
                    132: EVCNT_ATTACH_STATIC(sosend_kvalimit);
1.64      thorpej   133: #else
                    134:
                    135: #define        SOSEND_COUNTER_INCR(ev)         /* nothing */
                    136:
                    137: #endif /* SOSEND_COUNTERS */
                    138:
1.119     yamt      139: static struct callback_entry sokva_reclaimerentry;
1.1       cgd       140:
1.167     ad        141: #if defined(SOSEND_NO_LOAN) || defined(MULTIPROCESSOR)
1.121     yamt      142: int sock_loan_thresh = -1;
1.71      thorpej   143: #else
1.121     yamt      144: int sock_loan_thresh = 4096;
1.65      thorpej   145: #endif
1.64      thorpej   146:
1.136     ad        147: static kmutex_t so_pendfree_lock;
1.205     bouyer    148: static struct mbuf *so_pendfree = NULL;
1.64      thorpej   149:
1.84      ragge     150: #ifndef SOMAXKVA
                    151: #define        SOMAXKVA (16 * 1024 * 1024)
                    152: #endif
                    153: int somaxkva = SOMAXKVA;
1.113     thorpej   154: static int socurkva;
1.136     ad        155: static kcondvar_t socurkva_cv;
1.64      thorpej   156:
1.191     elad      157: static kauth_listener_t socket_listener;
                    158:
1.64      thorpej   159: #define        SOCK_LOAN_CHUNK         65536
                    160:
1.205     bouyer    161: static void sopendfree_thread(void *);
                    162: static kcondvar_t pendfree_thread_cv;
                    163: static lwp_t *sopendfree_lwp;
1.93      yamt      164:
1.178     pooka     165: static void sysctl_kern_somaxkva_setup(void);
                    166: static struct sysctllog *socket_sysctllog;
                    167:
1.113     thorpej   168: static vsize_t
1.129     yamt      169: sokvareserve(struct socket *so, vsize_t len)
1.80      yamt      170: {
1.98      christos  171:        int error;
1.80      yamt      172:
1.136     ad        173:        mutex_enter(&so_pendfree_lock);
1.80      yamt      174:        while (socurkva + len > somaxkva) {
                    175:                SOSEND_COUNTER_INCR(&sosend_kvalimit);
1.136     ad        176:                error = cv_wait_sig(&socurkva_cv, &so_pendfree_lock);
1.98      christos  177:                if (error) {
                    178:                        len = 0;
                    179:                        break;
                    180:                }
1.80      yamt      181:        }
1.93      yamt      182:        socurkva += len;
1.136     ad        183:        mutex_exit(&so_pendfree_lock);
1.98      christos  184:        return len;
1.95      yamt      185: }
                    186:
1.113     thorpej   187: static void
1.95      yamt      188: sokvaunreserve(vsize_t len)
                    189: {
                    190:
1.136     ad        191:        mutex_enter(&so_pendfree_lock);
1.95      yamt      192:        socurkva -= len;
1.136     ad        193:        cv_broadcast(&socurkva_cv);
                    194:        mutex_exit(&so_pendfree_lock);
1.95      yamt      195: }
                    196:
                    197: /*
                    198:  * sokvaalloc: allocate kva for loan.
                    199:  */
                    200:
                    201: vaddr_t
                    202: sokvaalloc(vsize_t len, struct socket *so)
                    203: {
                    204:        vaddr_t lva;
                    205:
                    206:        /*
                    207:         * reserve kva.
                    208:         */
                    209:
1.98      christos  210:        if (sokvareserve(so, len) == 0)
                    211:                return 0;
1.93      yamt      212:
                    213:        /*
                    214:         * allocate kva.
                    215:         */
1.80      yamt      216:
1.109     yamt      217:        lva = uvm_km_alloc(kernel_map, len, 0, UVM_KMF_VAONLY | UVM_KMF_WAITVA);
1.95      yamt      218:        if (lva == 0) {
                    219:                sokvaunreserve(len);
1.80      yamt      220:                return (0);
1.95      yamt      221:        }
1.80      yamt      222:
                    223:        return lva;
                    224: }
                    225:
1.93      yamt      226: /*
                    227:  * sokvafree: free kva for loan.
                    228:  */
                    229:
1.80      yamt      230: void
                    231: sokvafree(vaddr_t sva, vsize_t len)
                    232: {
1.93      yamt      233:
                    234:        /*
                    235:         * free kva.
                    236:         */
1.80      yamt      237:
1.109     yamt      238:        uvm_km_free(kernel_map, sva, len, UVM_KMF_VAONLY);
1.93      yamt      239:
                    240:        /*
                    241:         * unreserve kva.
                    242:         */
                    243:
1.95      yamt      244:        sokvaunreserve(len);
1.80      yamt      245: }
                    246:
1.64      thorpej   247: static void
1.134     christos  248: sodoloanfree(struct vm_page **pgs, void *buf, size_t size)
1.64      thorpej   249: {
1.156     yamt      250:        vaddr_t sva, eva;
1.64      thorpej   251:        vsize_t len;
1.156     yamt      252:        int npgs;
                    253:
                    254:        KASSERT(pgs != NULL);
1.64      thorpej   255:
                    256:        eva = round_page((vaddr_t) buf + size);
                    257:        sva = trunc_page((vaddr_t) buf);
                    258:        len = eva - sva;
                    259:        npgs = len >> PAGE_SHIFT;
                    260:
                    261:        pmap_kremove(sva, len);
                    262:        pmap_update(pmap_kernel());
                    263:        uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE);
1.80      yamt      264:        sokvafree(sva, len);
1.64      thorpej   265: }
                    266:
1.93      yamt      267: /*
1.205     bouyer    268:  * sopendfree_thread: free mbufs on "pendfree" list.
1.136     ad        269:  * unlock and relock so_pendfree_lock when freeing mbufs.
1.93      yamt      270:  */
                    271:
1.205     bouyer    272: static void
                    273: sopendfree_thread(void *v)
1.93      yamt      274: {
1.137     ad        275:        struct mbuf *m, *next;
1.205     bouyer    276:        size_t rv;
1.93      yamt      277:
1.205     bouyer    278:        mutex_enter(&so_pendfree_lock);
1.64      thorpej   279:
1.205     bouyer    280:        for (;;) {
                    281:                rv = 0;
                    282:                while (so_pendfree != NULL) {
                    283:                        m = so_pendfree;
                    284:                        so_pendfree = NULL;
                    285:                        mutex_exit(&so_pendfree_lock);
                    286:
                    287:                        for (; m != NULL; m = next) {
                    288:                                next = m->m_next;
                    289:                                KASSERT((~m->m_flags & (M_EXT|M_EXT_PAGES)) == 0);
                    290:                                KASSERT(m->m_ext.ext_refcnt == 0);
                    291:
                    292:                                rv += m->m_ext.ext_size;
                    293:                                sodoloanfree(m->m_ext.ext_pgs, m->m_ext.ext_buf,
                    294:                                    m->m_ext.ext_size);
                    295:                                pool_cache_put(mb_cache, m);
                    296:                        }
1.93      yamt      297:
1.205     bouyer    298:                        mutex_enter(&so_pendfree_lock);
1.93      yamt      299:                }
1.205     bouyer    300:                if (rv)
                    301:                        cv_broadcast(&socurkva_cv);
                    302:                cv_wait(&pendfree_thread_cv, &so_pendfree_lock);
1.64      thorpej   303:        }
1.205     bouyer    304:        panic("sopendfree_thread");
                    305:        /* NOTREACHED */
1.64      thorpej   306: }
                    307:
1.80      yamt      308: void
1.134     christos  309: soloanfree(struct mbuf *m, void *buf, size_t size, void *arg)
1.64      thorpej   310: {
                    311:
1.156     yamt      312:        KASSERT(m != NULL);
1.64      thorpej   313:
1.93      yamt      314:        /*
                    315:         * postpone freeing mbuf.
                    316:         *
                    317:         * we can't do it in interrupt context
                    318:         * because we need to put kva back to kernel_map.
                    319:         */
                    320:
1.136     ad        321:        mutex_enter(&so_pendfree_lock);
1.92      yamt      322:        m->m_next = so_pendfree;
                    323:        so_pendfree = m;
1.205     bouyer    324:        cv_signal(&pendfree_thread_cv);
1.136     ad        325:        mutex_exit(&so_pendfree_lock);
1.64      thorpej   326: }
                    327:
                    328: static long
                    329: sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space)
                    330: {
                    331:        struct iovec *iov = uio->uio_iov;
                    332:        vaddr_t sva, eva;
                    333:        vsize_t len;
1.156     yamt      334:        vaddr_t lva;
                    335:        int npgs, error;
                    336:        vaddr_t va;
                    337:        int i;
1.64      thorpej   338:
1.116     yamt      339:        if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace))
1.64      thorpej   340:                return (0);
                    341:
                    342:        if (iov->iov_len < (size_t) space)
                    343:                space = iov->iov_len;
                    344:        if (space > SOCK_LOAN_CHUNK)
                    345:                space = SOCK_LOAN_CHUNK;
                    346:
                    347:        eva = round_page((vaddr_t) iov->iov_base + space);
                    348:        sva = trunc_page((vaddr_t) iov->iov_base);
                    349:        len = eva - sva;
                    350:        npgs = len >> PAGE_SHIFT;
                    351:
1.79      thorpej   352:        KASSERT(npgs <= M_EXT_MAXPAGES);
                    353:
1.80      yamt      354:        lva = sokvaalloc(len, so);
1.64      thorpej   355:        if (lva == 0)
1.80      yamt      356:                return 0;
1.64      thorpej   357:
1.116     yamt      358:        error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len,
1.79      thorpej   359:            m->m_ext.ext_pgs, UVM_LOAN_TOPAGE);
1.64      thorpej   360:        if (error) {
1.80      yamt      361:                sokvafree(lva, len);
1.64      thorpej   362:                return (0);
                    363:        }
                    364:
                    365:        for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE)
1.79      thorpej   366:                pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]),
1.194     cegger    367:                    VM_PROT_READ, 0);
1.64      thorpej   368:        pmap_update(pmap_kernel());
                    369:
                    370:        lva += (vaddr_t) iov->iov_base & PAGE_MASK;
                    371:
1.134     christos  372:        MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so);
1.79      thorpej   373:        m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP;
1.64      thorpej   374:
                    375:        uio->uio_resid -= space;
                    376:        /* uio_offset not updated, not set/used for write(2) */
1.134     christos  377:        uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space;
1.64      thorpej   378:        uio->uio_iov->iov_len -= space;
                    379:        if (uio->uio_iov->iov_len == 0) {
                    380:                uio->uio_iov++;
                    381:                uio->uio_iovcnt--;
                    382:        }
                    383:
                    384:        return (space);
                    385: }
                    386:
1.119     yamt      387: static int
1.129     yamt      388: sokva_reclaim_callback(struct callback_entry *ce, void *obj, void *arg)
1.119     yamt      389: {
                    390:
                    391:        KASSERT(ce == &sokva_reclaimerentry);
                    392:        KASSERT(obj == NULL);
                    393:
                    394:        if (!vm_map_starved_p(kernel_map)) {
                    395:                return CALLBACK_CHAIN_ABORT;
                    396:        }
                    397:        return CALLBACK_CHAIN_CONTINUE;
                    398: }
                    399:
1.142     dyoung    400: struct mbuf *
1.147     dyoung    401: getsombuf(struct socket *so, int type)
1.142     dyoung    402: {
                    403:        struct mbuf *m;
                    404:
1.147     dyoung    405:        m = m_get(M_WAIT, type);
1.142     dyoung    406:        MCLAIM(m, so->so_mowner);
                    407:        return m;
                    408: }
                    409:
1.191     elad      410: static int
                    411: socket_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
                    412:     void *arg0, void *arg1, void *arg2, void *arg3)
                    413: {
                    414:        int result;
                    415:        enum kauth_network_req req;
                    416:
                    417:        result = KAUTH_RESULT_DEFER;
                    418:        req = (enum kauth_network_req)arg0;
                    419:
1.193     elad      420:        if ((action != KAUTH_NETWORK_SOCKET) &&
                    421:            (action != KAUTH_NETWORK_BIND))
1.191     elad      422:                return result;
                    423:
                    424:        switch (req) {
1.193     elad      425:        case KAUTH_REQ_NETWORK_BIND_PORT:
                    426:                result = KAUTH_RESULT_ALLOW;
                    427:                break;
                    428:
1.191     elad      429:        case KAUTH_REQ_NETWORK_SOCKET_DROP: {
                    430:                /* Normal users can only drop their own connections. */
                    431:                struct socket *so = (struct socket *)arg1;
                    432:
1.199     elad      433:                if (proc_uidmatch(cred, so->so_cred))
1.191     elad      434:                        result = KAUTH_RESULT_ALLOW;
                    435:
                    436:                break;
                    437:                }
                    438:
                    439:        case KAUTH_REQ_NETWORK_SOCKET_OPEN:
                    440:                /* We allow "raw" routing/bluetooth sockets to anyone. */
1.203     matt      441:                if ((u_long)arg1 == PF_ROUTE || (u_long)arg1 == PF_OROUTE
                    442:                    || (u_long)arg1 == PF_BLUETOOTH) {
1.191     elad      443:                        result = KAUTH_RESULT_ALLOW;
1.203     matt      444:                } else {
1.191     elad      445:                        /* Privileged, let secmodel handle this. */
                    446:                        if ((u_long)arg2 == SOCK_RAW)
                    447:                                break;
                    448:                }
                    449:
                    450:                result = KAUTH_RESULT_ALLOW;
                    451:
                    452:                break;
                    453:
1.192     elad      454:        case KAUTH_REQ_NETWORK_SOCKET_CANSEE:
                    455:                result = KAUTH_RESULT_ALLOW;
                    456:
                    457:                break;
                    458:
1.191     elad      459:        default:
                    460:                break;
                    461:        }
                    462:
                    463:        return result;
                    464: }
                    465:
1.119     yamt      466: void
                    467: soinit(void)
                    468: {
                    469:
1.178     pooka     470:        sysctl_kern_somaxkva_setup();
                    471:
1.148     ad        472:        mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM);
1.160     ad        473:        softnet_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
1.136     ad        474:        cv_init(&socurkva_cv, "sokva");
1.205     bouyer    475:        cv_init(&pendfree_thread_cv, "sopendfr");
1.166     ad        476:        soinit2();
1.136     ad        477:
1.119     yamt      478:        /* Set the initial adjusted socket buffer size. */
                    479:        if (sb_max_set(sb_max))
                    480:                panic("bad initial sb_max value: %lu", sb_max);
                    481:
                    482:        callback_register(&vm_map_to_kernel(kernel_map)->vmk_reclaim_callback,
                    483:            &sokva_reclaimerentry, NULL, sokva_reclaim_callback);
1.191     elad      484:
                    485:        socket_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
                    486:            socket_listener_cb, NULL);
1.119     yamt      487: }
                    488:
1.205     bouyer    489: void
                    490: soinit1(void)
                    491: {
                    492:        int error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL,
                    493:            sopendfree_thread, NULL, &sopendfree_lwp, "sopendfree");
                    494:        if (error)
                    495:                panic("soinit1 %d", error);
                    496: }
                    497:
1.1       cgd       498: /*
                    499:  * Socket operation routines.
                    500:  * These routines are called by the routines in
                    501:  * sys_socket.c or from a system process, and
                    502:  * implement the semantics of socket operations by
                    503:  * switching out to the protocol specific routines.
                    504:  */
                    505: /*ARGSUSED*/
1.3       andrew    506: int
1.160     ad        507: socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l,
                    508:         struct socket *lockso)
1.1       cgd       509: {
1.99      matt      510:        const struct protosw    *prp;
1.54      lukem     511:        struct socket   *so;
1.115     yamt      512:        uid_t           uid;
1.160     ad        513:        int             error;
                    514:        kmutex_t        *lock;
1.1       cgd       515:
1.132     elad      516:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET,
                    517:            KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type),
                    518:            KAUTH_ARG(proto));
1.140     dyoung    519:        if (error != 0)
                    520:                return error;
1.127     elad      521:
1.1       cgd       522:        if (proto)
                    523:                prp = pffindproto(dom, proto, type);
                    524:        else
                    525:                prp = pffindtype(dom, type);
1.140     dyoung    526:        if (prp == NULL) {
1.120     ginsbach  527:                /* no support for domain */
                    528:                if (pffinddomain(dom) == 0)
1.140     dyoung    529:                        return EAFNOSUPPORT;
1.120     ginsbach  530:                /* no support for socket type */
                    531:                if (proto == 0 && type != 0)
1.140     dyoung    532:                        return EPROTOTYPE;
                    533:                return EPROTONOSUPPORT;
1.120     ginsbach  534:        }
1.140     dyoung    535:        if (prp->pr_usrreq == NULL)
                    536:                return EPROTONOSUPPORT;
1.1       cgd       537:        if (prp->pr_type != type)
1.140     dyoung    538:                return EPROTOTYPE;
1.160     ad        539:
                    540:        so = soget(true);
1.1       cgd       541:        so->so_type = type;
                    542:        so->so_proto = prp;
1.33      matt      543:        so->so_send = sosend;
                    544:        so->so_receive = soreceive;
1.78      matt      545: #ifdef MBUFTRACE
                    546:        so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner;
                    547:        so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner;
                    548:        so->so_mowner = &prp->pr_domain->dom_mowner;
                    549: #endif
1.138     rmind     550:        uid = kauth_cred_geteuid(l->l_cred);
1.115     yamt      551:        so->so_uidinfo = uid_find(uid);
1.168     yamt      552:        so->so_cpid = l->l_proc->p_pid;
1.160     ad        553:        if (lockso != NULL) {
                    554:                /* Caller wants us to share a lock. */
                    555:                lock = lockso->so_lock;
                    556:                so->so_lock = lock;
                    557:                mutex_obj_hold(lock);
                    558:                mutex_enter(lock);
                    559:        } else {
                    560:                /* Lock assigned and taken during PRU_ATTACH. */
                    561:        }
1.140     dyoung    562:        error = (*prp->pr_usrreq)(so, PRU_ATTACH, NULL,
                    563:            (struct mbuf *)(long)proto, NULL, l);
1.160     ad        564:        KASSERT(solocked(so));
1.140     dyoung    565:        if (error != 0) {
1.1       cgd       566:                so->so_state |= SS_NOFDREF;
                    567:                sofree(so);
1.140     dyoung    568:                return error;
1.1       cgd       569:        }
1.198     elad      570:        so->so_cred = kauth_cred_dup(l->l_cred);
1.160     ad        571:        sounlock(so);
1.1       cgd       572:        *aso = so;
1.140     dyoung    573:        return 0;
1.1       cgd       574: }
                    575:
1.142     dyoung    576: /* On success, write file descriptor to fdout and return zero.  On
                    577:  * failure, return non-zero; *fdout will be undefined.
                    578:  */
                    579: int
                    580: fsocreate(int domain, struct socket **sop, int type, int protocol,
                    581:     struct lwp *l, int *fdout)
                    582: {
                    583:        struct socket   *so;
                    584:        struct file     *fp;
                    585:        int             fd, error;
1.204     christos  586:        int             flags = type & SOCK_FLAGS_MASK;
1.142     dyoung    587:
1.204     christos  588:        type &= ~SOCK_FLAGS_MASK;
1.155     ad        589:        if ((error = fd_allocfile(&fp, &fd)) != 0)
1.204     christos  590:                return error;
                    591:        fd_set_exclose(l, fd, (flags & SOCK_CLOEXEC) != 0);
1.207   ! christos  592:        fp->f_flag = FREAD|FWRITE|((flags & SOCK_NONBLOCK) ? FNONBLOCK : 0)|
        !           593:            ((flags & SOCK_NOSIGPIPE) ? FNOSIGPIPE : 0);
1.142     dyoung    594:        fp->f_type = DTYPE_SOCKET;
                    595:        fp->f_ops = &socketops;
1.160     ad        596:        error = socreate(domain, &so, type, protocol, l, NULL);
1.142     dyoung    597:        if (error != 0) {
1.155     ad        598:                fd_abort(curproc, fp, fd);
1.142     dyoung    599:        } else {
                    600:                if (sop != NULL)
                    601:                        *sop = so;
                    602:                fp->f_data = so;
1.155     ad        603:                fd_affix(curproc, fp, fd);
1.142     dyoung    604:                *fdout = fd;
                    605:        }
                    606:        return error;
                    607: }
                    608:
1.3       andrew    609: int
1.190     dyoung    610: sofamily(const struct socket *so)
                    611: {
                    612:        const struct protosw *pr;
                    613:        const struct domain *dom;
                    614:
                    615:        if ((pr = so->so_proto) == NULL)
                    616:                return AF_UNSPEC;
                    617:        if ((dom = pr->pr_domain) == NULL)
                    618:                return AF_UNSPEC;
                    619:        return dom->dom_family;
                    620: }
                    621:
                    622: int
1.114     christos  623: sobind(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1       cgd       624: {
1.160     ad        625:        int     error;
1.1       cgd       626:
1.160     ad        627:        solock(so);
1.140     dyoung    628:        error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, NULL, nam, NULL, l);
1.160     ad        629:        sounlock(so);
1.140     dyoung    630:        return error;
1.1       cgd       631: }
                    632:
1.3       andrew    633: int
1.150     elad      634: solisten(struct socket *so, int backlog, struct lwp *l)
1.1       cgd       635: {
1.160     ad        636:        int     error;
1.1       cgd       637:
1.160     ad        638:        solock(so);
1.158     ad        639:        if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163     ad        640:            SS_ISDISCONNECTING)) != 0) {
                    641:                sounlock(so);
1.158     ad        642:                return (EOPNOTSUPP);
1.163     ad        643:        }
1.140     dyoung    644:        error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, NULL,
1.150     elad      645:            NULL, NULL, l);
1.140     dyoung    646:        if (error != 0) {
1.160     ad        647:                sounlock(so);
1.140     dyoung    648:                return error;
1.1       cgd       649:        }
1.63      matt      650:        if (TAILQ_EMPTY(&so->so_q))
1.1       cgd       651:                so->so_options |= SO_ACCEPTCONN;
                    652:        if (backlog < 0)
                    653:                backlog = 0;
1.49      jonathan  654:        so->so_qlimit = min(backlog, somaxconn);
1.160     ad        655:        sounlock(so);
1.140     dyoung    656:        return 0;
1.1       cgd       657: }
                    658:
1.21      christos  659: void
1.54      lukem     660: sofree(struct socket *so)
1.1       cgd       661: {
1.161     ad        662:        u_int refs;
1.1       cgd       663:
1.160     ad        664:        KASSERT(solocked(so));
                    665:
                    666:        if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
                    667:                sounlock(so);
1.1       cgd       668:                return;
1.160     ad        669:        }
1.43      mycroft   670:        if (so->so_head) {
                    671:                /*
                    672:                 * We must not decommission a socket that's on the accept(2)
                    673:                 * queue.  If we do, then accept(2) may hang after select(2)
                    674:                 * indicated that the listening socket was ready.
                    675:                 */
1.160     ad        676:                if (!soqremque(so, 0)) {
                    677:                        sounlock(so);
1.43      mycroft   678:                        return;
1.160     ad        679:                }
1.43      mycroft   680:        }
1.98      christos  681:        if (so->so_rcv.sb_hiwat)
1.110     christos  682:                (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98      christos  683:                    RLIM_INFINITY);
                    684:        if (so->so_snd.sb_hiwat)
1.110     christos  685:                (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98      christos  686:                    RLIM_INFINITY);
                    687:        sbrelease(&so->so_snd, so);
1.160     ad        688:        KASSERT(!cv_has_waiters(&so->so_cv));
                    689:        KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
                    690:        KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1       cgd       691:        sorflush(so);
1.161     ad        692:        refs = so->so_aborting; /* XXX */
1.177     ad        693:        /* Remove acccept filter if one is present. */
1.170     tls       694:        if (so->so_accf != NULL)
1.177     ad        695:                (void)accept_filt_clear(so);
1.160     ad        696:        sounlock(so);
1.161     ad        697:        if (refs == 0)          /* XXX */
                    698:                soput(so);
1.1       cgd       699: }
                    700:
                    701: /*
                    702:  * Close a socket on last file table reference removal.
                    703:  * Initiate disconnect if connected.
                    704:  * Free socket when disconnect complete.
                    705:  */
1.3       andrew    706: int
1.54      lukem     707: soclose(struct socket *so)
1.1       cgd       708: {
1.54      lukem     709:        struct socket   *so2;
1.160     ad        710:        int             error;
                    711:        int             error2;
1.1       cgd       712:
1.54      lukem     713:        error = 0;
1.160     ad        714:        solock(so);
1.1       cgd       715:        if (so->so_options & SO_ACCEPTCONN) {
1.172     ad        716:                for (;;) {
                    717:                        if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.160     ad        718:                                KASSERT(solocked2(so, so2));
                    719:                                (void) soqremque(so2, 0);
                    720:                                /* soabort drops the lock. */
                    721:                                (void) soabort(so2);
                    722:                                solock(so);
1.172     ad        723:                                continue;
1.160     ad        724:                        }
1.172     ad        725:                        if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.160     ad        726:                                KASSERT(solocked2(so, so2));
                    727:                                (void) soqremque(so2, 1);
                    728:                                /* soabort drops the lock. */
                    729:                                (void) soabort(so2);
                    730:                                solock(so);
1.172     ad        731:                                continue;
1.160     ad        732:                        }
1.172     ad        733:                        break;
                    734:                }
1.1       cgd       735:        }
                    736:        if (so->so_pcb == 0)
                    737:                goto discard;
                    738:        if (so->so_state & SS_ISCONNECTED) {
                    739:                if ((so->so_state & SS_ISDISCONNECTING) == 0) {
                    740:                        error = sodisconnect(so);
                    741:                        if (error)
                    742:                                goto drop;
                    743:                }
                    744:                if (so->so_options & SO_LINGER) {
1.206     christos  745:                        if ((so->so_state & (SS_ISDISCONNECTING|SS_NBIO)) ==
                    746:                            (SS_ISDISCONNECTING|SS_NBIO))
1.1       cgd       747:                                goto drop;
1.21      christos  748:                        while (so->so_state & SS_ISCONNECTED) {
1.185     yamt      749:                                error = sowait(so, true, so->so_linger * hz);
1.21      christos  750:                                if (error)
1.1       cgd       751:                                        break;
1.21      christos  752:                        }
1.1       cgd       753:                }
                    754:        }
1.54      lukem     755:  drop:
1.1       cgd       756:        if (so->so_pcb) {
1.160     ad        757:                error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
1.140     dyoung    758:                    NULL, NULL, NULL, NULL);
1.1       cgd       759:                if (error == 0)
                    760:                        error = error2;
                    761:        }
1.54      lukem     762:  discard:
1.1       cgd       763:        if (so->so_state & SS_NOFDREF)
                    764:                panic("soclose: NOFDREF");
1.198     elad      765:        kauth_cred_free(so->so_cred);
1.1       cgd       766:        so->so_state |= SS_NOFDREF;
                    767:        sofree(so);
                    768:        return (error);
                    769: }
                    770:
                    771: /*
1.160     ad        772:  * Must be called with the socket locked..  Will return with it unlocked.
1.1       cgd       773:  */
1.3       andrew    774: int
1.54      lukem     775: soabort(struct socket *so)
1.1       cgd       776: {
1.161     ad        777:        u_int refs;
1.139     yamt      778:        int error;
1.160     ad        779:
                    780:        KASSERT(solocked(so));
                    781:        KASSERT(so->so_head == NULL);
1.1       cgd       782:
1.161     ad        783:        so->so_aborting++;              /* XXX */
1.140     dyoung    784:        error = (*so->so_proto->pr_usrreq)(so, PRU_ABORT, NULL,
                    785:            NULL, NULL, NULL);
1.161     ad        786:        refs = --so->so_aborting;       /* XXX */
1.164     drochner  787:        if (error || (refs == 0)) {
1.139     yamt      788:                sofree(so);
1.160     ad        789:        } else {
                    790:                sounlock(so);
1.139     yamt      791:        }
                    792:        return error;
1.1       cgd       793: }
                    794:
1.3       andrew    795: int
1.54      lukem     796: soaccept(struct socket *so, struct mbuf *nam)
1.1       cgd       797: {
1.160     ad        798:        int     error;
                    799:
                    800:        KASSERT(solocked(so));
1.1       cgd       801:
1.54      lukem     802:        error = 0;
1.1       cgd       803:        if ((so->so_state & SS_NOFDREF) == 0)
                    804:                panic("soaccept: !NOFDREF");
                    805:        so->so_state &= ~SS_NOFDREF;
1.55      thorpej   806:        if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
                    807:            (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.41      mycroft   808:                error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT,
1.140     dyoung    809:                    NULL, nam, NULL, NULL);
1.41      mycroft   810:        else
1.53      itojun    811:                error = ECONNABORTED;
1.52      itojun    812:
1.1       cgd       813:        return (error);
                    814: }
                    815:
1.3       andrew    816: int
1.114     christos  817: soconnect(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1       cgd       818: {
1.160     ad        819:        int             error;
                    820:
                    821:        KASSERT(solocked(so));
1.1       cgd       822:
                    823:        if (so->so_options & SO_ACCEPTCONN)
                    824:                return (EOPNOTSUPP);
                    825:        /*
                    826:         * If protocol is connection-based, can only connect once.
                    827:         * Otherwise, if connected, try to disconnect first.
                    828:         * This allows user to disconnect by connecting to, e.g.,
                    829:         * a null address.
                    830:         */
                    831:        if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
                    832:            ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
                    833:            (error = sodisconnect(so))))
                    834:                error = EISCONN;
                    835:        else
                    836:                error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
1.140     dyoung    837:                    NULL, nam, NULL, l);
1.1       cgd       838:        return (error);
                    839: }
                    840:
1.3       andrew    841: int
1.54      lukem     842: soconnect2(struct socket *so1, struct socket *so2)
1.1       cgd       843: {
1.160     ad        844:        int     error;
                    845:
                    846:        KASSERT(solocked2(so1, so2));
1.1       cgd       847:
1.22      mycroft   848:        error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
1.140     dyoung    849:            NULL, (struct mbuf *)so2, NULL, NULL);
1.1       cgd       850:        return (error);
                    851: }
                    852:
1.3       andrew    853: int
1.54      lukem     854: sodisconnect(struct socket *so)
1.1       cgd       855: {
1.160     ad        856:        int     error;
                    857:
                    858:        KASSERT(solocked(so));
1.1       cgd       859:
                    860:        if ((so->so_state & SS_ISCONNECTED) == 0) {
                    861:                error = ENOTCONN;
1.160     ad        862:        } else if (so->so_state & SS_ISDISCONNECTING) {
1.1       cgd       863:                error = EALREADY;
1.160     ad        864:        } else {
                    865:                error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
                    866:                    NULL, NULL, NULL, NULL);
1.1       cgd       867:        }
                    868:        return (error);
                    869: }
                    870:
1.15      mycroft   871: #define        SBLOCKWAIT(f)   (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1       cgd       872: /*
                    873:  * Send on a socket.
                    874:  * If send must go all at once and message is larger than
                    875:  * send buffering, then hard error.
                    876:  * Lock against other senders.
                    877:  * If must go all at once and not enough room now, then
                    878:  * inform user that this would block and do nothing.
                    879:  * Otherwise, if nonblocking, send as much as possible.
                    880:  * The data to be sent is described by "uio" if nonzero,
                    881:  * otherwise by the mbuf chain "top" (which must be null
                    882:  * if uio is not).  Data provided in mbuf chain must be small
                    883:  * enough to send all at once.
                    884:  *
                    885:  * Returns nonzero on error, timeout or signal; callers
                    886:  * must check for short counts if EINTR/ERESTART are returned.
                    887:  * Data and control buffers are freed on return.
                    888:  */
1.3       andrew    889: int
1.54      lukem     890: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
1.114     christos  891:        struct mbuf *control, int flags, struct lwp *l)
1.1       cgd       892: {
1.54      lukem     893:        struct mbuf     **mp, *m;
1.114     christos  894:        struct proc     *p;
1.58      jdolecek  895:        long            space, len, resid, clen, mlen;
                    896:        int             error, s, dontroute, atomic;
1.196     dsl       897:        short           wakeup_state = 0;
1.54      lukem     898:
1.114     christos  899:        p = l->l_proc;
1.160     ad        900:        clen = 0;
1.64      thorpej   901:
1.160     ad        902:        /*
                    903:         * solock() provides atomicity of access.  splsoftnet() prevents
                    904:         * protocol processing soft interrupts from interrupting us and
                    905:         * blocking (expensive).
                    906:         */
                    907:        s = splsoftnet();
                    908:        solock(so);
1.54      lukem     909:        atomic = sosendallatonce(so) || top;
1.1       cgd       910:        if (uio)
                    911:                resid = uio->uio_resid;
                    912:        else
                    913:                resid = top->m_pkthdr.len;
1.7       cgd       914:        /*
                    915:         * In theory resid should be unsigned.
                    916:         * However, space must be signed, as it might be less than 0
                    917:         * if we over-committed, and we must use a signed comparison
                    918:         * of space and resid.  On the other hand, a negative resid
                    919:         * causes us to loop sending 0-length segments to the protocol.
                    920:         */
1.29      mycroft   921:        if (resid < 0) {
                    922:                error = EINVAL;
                    923:                goto out;
                    924:        }
1.1       cgd       925:        dontroute =
                    926:            (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
                    927:            (so->so_proto->pr_flags & PR_ATOMIC);
1.165     christos  928:        l->l_ru.ru_msgsnd++;
1.1       cgd       929:        if (control)
                    930:                clen = control->m_len;
1.54      lukem     931:  restart:
1.21      christos  932:        if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1       cgd       933:                goto out;
                    934:        do {
1.160     ad        935:                if (so->so_state & SS_CANTSENDMORE) {
                    936:                        error = EPIPE;
                    937:                        goto release;
                    938:                }
1.48      thorpej   939:                if (so->so_error) {
                    940:                        error = so->so_error;
                    941:                        so->so_error = 0;
                    942:                        goto release;
                    943:                }
1.1       cgd       944:                if ((so->so_state & SS_ISCONNECTED) == 0) {
                    945:                        if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
                    946:                                if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1.160     ad        947:                                    !(resid == 0 && clen != 0)) {
                    948:                                        error = ENOTCONN;
                    949:                                        goto release;
                    950:                                }
                    951:                        } else if (addr == 0) {
                    952:                                error = EDESTADDRREQ;
                    953:                                goto release;
                    954:                        }
1.1       cgd       955:                }
                    956:                space = sbspace(&so->so_snd);
                    957:                if (flags & MSG_OOB)
                    958:                        space += 1024;
1.21      christos  959:                if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160     ad        960:                    clen > so->so_snd.sb_hiwat) {
                    961:                        error = EMSGSIZE;
                    962:                        goto release;
                    963:                }
1.96      mycroft   964:                if (space < resid + clen &&
1.1       cgd       965:                    (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.206     christos  966:                        if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1.160     ad        967:                                error = EWOULDBLOCK;
                    968:                                goto release;
                    969:                        }
1.1       cgd       970:                        sbunlock(&so->so_snd);
1.196     dsl       971:                        if (wakeup_state & SS_RESTARTSYS) {
                    972:                                error = ERESTART;
                    973:                                goto out;
                    974:                        }
1.1       cgd       975:                        error = sbwait(&so->so_snd);
                    976:                        if (error)
                    977:                                goto out;
1.196     dsl       978:                        wakeup_state = so->so_state;
1.1       cgd       979:                        goto restart;
                    980:                }
1.196     dsl       981:                wakeup_state = 0;
1.1       cgd       982:                mp = &top;
                    983:                space -= clen;
                    984:                do {
1.45      tv        985:                        if (uio == NULL) {
                    986:                                /*
                    987:                                 * Data is prepackaged in "top".
                    988:                                 */
                    989:                                resid = 0;
                    990:                                if (flags & MSG_EOR)
                    991:                                        top->m_flags |= M_EOR;
                    992:                        } else do {
1.160     ad        993:                                sounlock(so);
                    994:                                splx(s);
1.144     dyoung    995:                                if (top == NULL) {
1.78      matt      996:                                        m = m_gethdr(M_WAIT, MT_DATA);
1.45      tv        997:                                        mlen = MHLEN;
                    998:                                        m->m_pkthdr.len = 0;
1.140     dyoung    999:                                        m->m_pkthdr.rcvif = NULL;
1.45      tv       1000:                                } else {
1.78      matt     1001:                                        m = m_get(M_WAIT, MT_DATA);
1.45      tv       1002:                                        mlen = MLEN;
                   1003:                                }
1.78      matt     1004:                                MCLAIM(m, so->so_snd.sb_mowner);
1.121     yamt     1005:                                if (sock_loan_thresh >= 0 &&
                   1006:                                    uio->uio_iov->iov_len >= sock_loan_thresh &&
                   1007:                                    space >= sock_loan_thresh &&
1.64      thorpej  1008:                                    (len = sosend_loan(so, uio, m,
                   1009:                                                       space)) != 0) {
                   1010:                                        SOSEND_COUNTER_INCR(&sosend_loan_big);
                   1011:                                        space -= len;
                   1012:                                        goto have_data;
                   1013:                                }
1.45      tv       1014:                                if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64      thorpej  1015:                                        SOSEND_COUNTER_INCR(&sosend_copy_big);
1.201     oki      1016:                                        m_clget(m, M_DONTWAIT);
1.45      tv       1017:                                        if ((m->m_flags & M_EXT) == 0)
                   1018:                                                goto nopages;
                   1019:                                        mlen = MCLBYTES;
                   1020:                                        if (atomic && top == 0) {
1.58      jdolecek 1021:                                                len = lmin(MCLBYTES - max_hdr,
1.54      lukem    1022:                                                    resid);
1.45      tv       1023:                                                m->m_data += max_hdr;
                   1024:                                        } else
1.58      jdolecek 1025:                                                len = lmin(MCLBYTES, resid);
1.45      tv       1026:                                        space -= len;
                   1027:                                } else {
1.64      thorpej  1028:  nopages:
                   1029:                                        SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58      jdolecek 1030:                                        len = lmin(lmin(mlen, resid), space);
1.45      tv       1031:                                        space -= len;
                   1032:                                        /*
                   1033:                                         * For datagram protocols, leave room
                   1034:                                         * for protocol headers in first mbuf.
                   1035:                                         */
                   1036:                                        if (atomic && top == 0 && len < mlen)
                   1037:                                                MH_ALIGN(m, len);
                   1038:                                }
1.144     dyoung   1039:                                error = uiomove(mtod(m, void *), (int)len, uio);
1.64      thorpej  1040:  have_data:
1.45      tv       1041:                                resid = uio->uio_resid;
                   1042:                                m->m_len = len;
                   1043:                                *mp = m;
                   1044:                                top->m_pkthdr.len += len;
1.160     ad       1045:                                s = splsoftnet();
                   1046:                                solock(so);
1.144     dyoung   1047:                                if (error != 0)
1.45      tv       1048:                                        goto release;
                   1049:                                mp = &m->m_next;
                   1050:                                if (resid <= 0) {
                   1051:                                        if (flags & MSG_EOR)
                   1052:                                                top->m_flags |= M_EOR;
                   1053:                                        break;
                   1054:                                }
                   1055:                        } while (space > 0 && atomic);
1.108     perry    1056:
1.160     ad       1057:                        if (so->so_state & SS_CANTSENDMORE) {
                   1058:                                error = EPIPE;
                   1059:                                goto release;
                   1060:                        }
1.45      tv       1061:                        if (dontroute)
                   1062:                                so->so_options |= SO_DONTROUTE;
                   1063:                        if (resid > 0)
                   1064:                                so->so_state |= SS_MORETOCOME;
1.46      sommerfe 1065:                        error = (*so->so_proto->pr_usrreq)(so,
                   1066:                            (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
1.160     ad       1067:                            top, addr, control, curlwp);
1.45      tv       1068:                        if (dontroute)
                   1069:                                so->so_options &= ~SO_DONTROUTE;
                   1070:                        if (resid > 0)
                   1071:                                so->so_state &= ~SS_MORETOCOME;
                   1072:                        clen = 0;
1.144     dyoung   1073:                        control = NULL;
                   1074:                        top = NULL;
1.45      tv       1075:                        mp = &top;
1.144     dyoung   1076:                        if (error != 0)
1.1       cgd      1077:                                goto release;
                   1078:                } while (resid && space > 0);
                   1079:        } while (resid);
                   1080:
1.54      lukem    1081:  release:
1.1       cgd      1082:        sbunlock(&so->so_snd);
1.54      lukem    1083:  out:
1.160     ad       1084:        sounlock(so);
                   1085:        splx(s);
1.1       cgd      1086:        if (top)
                   1087:                m_freem(top);
                   1088:        if (control)
                   1089:                m_freem(control);
                   1090:        return (error);
                   1091: }
                   1092:
                   1093: /*
1.159     ad       1094:  * Following replacement or removal of the first mbuf on the first
                   1095:  * mbuf chain of a socket buffer, push necessary state changes back
                   1096:  * into the socket buffer so that other consumers see the values
                   1097:  * consistently.  'nextrecord' is the callers locally stored value of
                   1098:  * the original value of sb->sb_mb->m_nextpkt which must be restored
                   1099:  * when the lead mbuf changes.  NOTE: 'nextrecord' may be NULL.
                   1100:  */
                   1101: static void
                   1102: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
                   1103: {
                   1104:
1.160     ad       1105:        KASSERT(solocked(sb->sb_so));
                   1106:
1.159     ad       1107:        /*
                   1108:         * First, update for the new value of nextrecord.  If necessary,
                   1109:         * make it the first record.
                   1110:         */
                   1111:        if (sb->sb_mb != NULL)
                   1112:                sb->sb_mb->m_nextpkt = nextrecord;
                   1113:        else
                   1114:                sb->sb_mb = nextrecord;
                   1115:
                   1116:         /*
                   1117:          * Now update any dependent socket buffer fields to reflect
                   1118:          * the new state.  This is an inline of SB_EMPTY_FIXUP, with
                   1119:          * the addition of a second clause that takes care of the
                   1120:          * case where sb_mb has been updated, but remains the last
                   1121:          * record.
                   1122:          */
                   1123:         if (sb->sb_mb == NULL) {
                   1124:                 sb->sb_mbtail = NULL;
                   1125:                 sb->sb_lastrecord = NULL;
                   1126:         } else if (sb->sb_mb->m_nextpkt == NULL)
                   1127:                 sb->sb_lastrecord = sb->sb_mb;
                   1128: }
                   1129:
                   1130: /*
1.1       cgd      1131:  * Implement receive operations on a socket.
                   1132:  * We depend on the way that records are added to the sockbuf
                   1133:  * by sbappend*.  In particular, each record (mbufs linked through m_next)
                   1134:  * must begin with an address if the protocol so specifies,
                   1135:  * followed by an optional mbuf or mbufs containing ancillary data,
                   1136:  * and then zero or more mbufs of data.
                   1137:  * In order to avoid blocking network interrupts for the entire time here,
                   1138:  * we splx() while doing the actual copy to user space.
                   1139:  * Although the sockbuf is locked, new data may still be appended,
                   1140:  * and thus we must maintain consistency of the sockbuf during that time.
                   1141:  *
                   1142:  * The caller may receive the data as a single mbuf chain by supplying
                   1143:  * an mbuf **mp0 for use in returning the chain.  The uio is then used
                   1144:  * only for the count in uio_resid.
                   1145:  */
1.3       andrew   1146: int
1.54      lukem    1147: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
                   1148:        struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1       cgd      1149: {
1.116     yamt     1150:        struct lwp *l = curlwp;
1.160     ad       1151:        struct mbuf     *m, **mp, *mt;
1.146     dyoung   1152:        int atomic, flags, len, error, s, offset, moff, type, orig_resid;
1.99      matt     1153:        const struct protosw    *pr;
1.54      lukem    1154:        struct mbuf     *nextrecord;
1.67      he       1155:        int             mbuf_removed = 0;
1.146     dyoung   1156:        const struct domain *dom;
1.196     dsl      1157:        short           wakeup_state = 0;
1.64      thorpej  1158:
1.54      lukem    1159:        pr = so->so_proto;
1.146     dyoung   1160:        atomic = pr->pr_flags & PR_ATOMIC;
                   1161:        dom = pr->pr_domain;
1.1       cgd      1162:        mp = mp0;
1.54      lukem    1163:        type = 0;
                   1164:        orig_resid = uio->uio_resid;
1.102     jonathan 1165:
1.144     dyoung   1166:        if (paddr != NULL)
                   1167:                *paddr = NULL;
                   1168:        if (controlp != NULL)
                   1169:                *controlp = NULL;
                   1170:        if (flagsp != NULL)
1.1       cgd      1171:                flags = *flagsp &~ MSG_EOR;
                   1172:        else
                   1173:                flags = 0;
1.66      enami    1174:
1.1       cgd      1175:        if (flags & MSG_OOB) {
                   1176:                m = m_get(M_WAIT, MT_DATA);
1.160     ad       1177:                solock(so);
1.17      cgd      1178:                error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
1.140     dyoung   1179:                    (struct mbuf *)(long)(flags & MSG_PEEK), NULL, l);
1.160     ad       1180:                sounlock(so);
1.1       cgd      1181:                if (error)
                   1182:                        goto bad;
                   1183:                do {
1.134     christos 1184:                        error = uiomove(mtod(m, void *),
1.1       cgd      1185:                            (int) min(uio->uio_resid, m->m_len), uio);
                   1186:                        m = m_free(m);
1.144     dyoung   1187:                } while (uio->uio_resid > 0 && error == 0 && m);
1.54      lukem    1188:  bad:
1.144     dyoung   1189:                if (m != NULL)
1.1       cgd      1190:                        m_freem(m);
1.144     dyoung   1191:                return error;
1.1       cgd      1192:        }
1.144     dyoung   1193:        if (mp != NULL)
1.140     dyoung   1194:                *mp = NULL;
1.160     ad       1195:
                   1196:        /*
                   1197:         * solock() provides atomicity of access.  splsoftnet() prevents
                   1198:         * protocol processing soft interrupts from interrupting us and
                   1199:         * blocking (expensive).
                   1200:         */
                   1201:        s = splsoftnet();
                   1202:        solock(so);
1.1       cgd      1203:        if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
1.140     dyoung   1204:                (*pr->pr_usrreq)(so, PRU_RCVD, NULL, NULL, NULL, l);
1.1       cgd      1205:
1.54      lukem    1206:  restart:
1.160     ad       1207:        if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
                   1208:                sounlock(so);
                   1209:                splx(s);
1.144     dyoung   1210:                return error;
1.160     ad       1211:        }
1.1       cgd      1212:
                   1213:        m = so->so_rcv.sb_mb;
                   1214:        /*
                   1215:         * If we have less data than requested, block awaiting more
                   1216:         * (subject to any timeout) if:
1.15      mycroft  1217:         *   1. the current count is less than the low water mark,
1.1       cgd      1218:         *   2. MSG_WAITALL is set, and it is possible to do the entire
1.15      mycroft  1219:         *      receive operation at once if we block (resid <= hiwat), or
                   1220:         *   3. MSG_DONTWAIT is not set.
1.1       cgd      1221:         * If MSG_WAITALL is set but resid is larger than the receive buffer,
                   1222:         * we have to do the receive in sections, and thus risk returning
                   1223:         * a short count if a timeout or signal occurs after we start.
                   1224:         */
1.144     dyoung   1225:        if (m == NULL ||
                   1226:            ((flags & MSG_DONTWAIT) == 0 &&
                   1227:             so->so_rcv.sb_cc < uio->uio_resid &&
                   1228:             (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
                   1229:              ((flags & MSG_WAITALL) &&
                   1230:               uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146     dyoung   1231:             m->m_nextpkt == NULL && !atomic)) {
1.1       cgd      1232: #ifdef DIAGNOSTIC
1.144     dyoung   1233:                if (m == NULL && so->so_rcv.sb_cc)
1.1       cgd      1234:                        panic("receive 1");
                   1235: #endif
                   1236:                if (so->so_error) {
1.144     dyoung   1237:                        if (m != NULL)
1.15      mycroft  1238:                                goto dontblock;
1.1       cgd      1239:                        error = so->so_error;
                   1240:                        if ((flags & MSG_PEEK) == 0)
                   1241:                                so->so_error = 0;
                   1242:                        goto release;
                   1243:                }
                   1244:                if (so->so_state & SS_CANTRCVMORE) {
1.144     dyoung   1245:                        if (m != NULL)
1.15      mycroft  1246:                                goto dontblock;
1.1       cgd      1247:                        else
                   1248:                                goto release;
                   1249:                }
1.144     dyoung   1250:                for (; m != NULL; m = m->m_next)
1.1       cgd      1251:                        if (m->m_type == MT_OOBDATA  || (m->m_flags & M_EOR)) {
                   1252:                                m = so->so_rcv.sb_mb;
                   1253:                                goto dontblock;
                   1254:                        }
                   1255:                if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
                   1256:                    (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
                   1257:                        error = ENOTCONN;
                   1258:                        goto release;
                   1259:                }
                   1260:                if (uio->uio_resid == 0)
                   1261:                        goto release;
1.206     christos 1262:                if ((so->so_state & SS_NBIO) ||
                   1263:                    (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1.1       cgd      1264:                        error = EWOULDBLOCK;
                   1265:                        goto release;
                   1266:                }
1.69      thorpej  1267:                SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
                   1268:                SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1       cgd      1269:                sbunlock(&so->so_rcv);
1.196     dsl      1270:                if (wakeup_state & SS_RESTARTSYS)
                   1271:                        error = ERESTART;
                   1272:                else
                   1273:                        error = sbwait(&so->so_rcv);
1.160     ad       1274:                if (error != 0) {
                   1275:                        sounlock(so);
                   1276:                        splx(s);
1.144     dyoung   1277:                        return error;
1.160     ad       1278:                }
1.196     dsl      1279:                wakeup_state = so->so_state;
1.1       cgd      1280:                goto restart;
                   1281:        }
1.54      lukem    1282:  dontblock:
1.69      thorpej  1283:        /*
                   1284:         * On entry here, m points to the first record of the socket buffer.
1.159     ad       1285:         * From this point onward, we maintain 'nextrecord' as a cache of the
                   1286:         * pointer to the next record in the socket buffer.  We must keep the
                   1287:         * various socket buffer pointers and local stack versions of the
                   1288:         * pointers in sync, pushing out modifications before dropping the
1.160     ad       1289:         * socket lock, and re-reading them when picking it up.
1.159     ad       1290:         *
                   1291:         * Otherwise, we will race with the network stack appending new data
                   1292:         * or records onto the socket buffer by using inconsistent/stale
                   1293:         * versions of the field, possibly resulting in socket buffer
                   1294:         * corruption.
                   1295:         *
                   1296:         * By holding the high-level sblock(), we prevent simultaneous
                   1297:         * readers from pulling off the front of the socket buffer.
1.69      thorpej  1298:         */
1.144     dyoung   1299:        if (l != NULL)
1.157     ad       1300:                l->l_ru.ru_msgrcv++;
1.69      thorpej  1301:        KASSERT(m == so->so_rcv.sb_mb);
                   1302:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
                   1303:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1       cgd      1304:        nextrecord = m->m_nextpkt;
                   1305:        if (pr->pr_flags & PR_ADDR) {
                   1306: #ifdef DIAGNOSTIC
                   1307:                if (m->m_type != MT_SONAME)
                   1308:                        panic("receive 1a");
                   1309: #endif
1.3       andrew   1310:                orig_resid = 0;
1.1       cgd      1311:                if (flags & MSG_PEEK) {
                   1312:                        if (paddr)
                   1313:                                *paddr = m_copy(m, 0, m->m_len);
                   1314:                        m = m->m_next;
                   1315:                } else {
                   1316:                        sbfree(&so->so_rcv, m);
1.67      he       1317:                        mbuf_removed = 1;
1.144     dyoung   1318:                        if (paddr != NULL) {
1.1       cgd      1319:                                *paddr = m;
                   1320:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1321:                                m->m_next = NULL;
1.1       cgd      1322:                                m = so->so_rcv.sb_mb;
                   1323:                        } else {
                   1324:                                MFREE(m, so->so_rcv.sb_mb);
                   1325:                                m = so->so_rcv.sb_mb;
                   1326:                        }
1.159     ad       1327:                        sbsync(&so->so_rcv, nextrecord);
1.1       cgd      1328:                }
                   1329:        }
1.159     ad       1330:
                   1331:        /*
                   1332:         * Process one or more MT_CONTROL mbufs present before any data mbufs
                   1333:         * in the first mbuf chain on the socket buffer.  If MSG_PEEK, we
                   1334:         * just copy the data; if !MSG_PEEK, we call into the protocol to
                   1335:         * perform externalization (or freeing if controlp == NULL).
                   1336:         */
                   1337:        if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
                   1338:                struct mbuf *cm = NULL, *cmn;
                   1339:                struct mbuf **cme = &cm;
                   1340:
                   1341:                do {
                   1342:                        if (flags & MSG_PEEK) {
                   1343:                                if (controlp != NULL) {
                   1344:                                        *controlp = m_copy(m, 0, m->m_len);
                   1345:                                        controlp = &(*controlp)->m_next;
                   1346:                                }
                   1347:                                m = m->m_next;
                   1348:                        } else {
                   1349:                                sbfree(&so->so_rcv, m);
1.1       cgd      1350:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1351:                                m->m_next = NULL;
1.159     ad       1352:                                *cme = m;
                   1353:                                cme = &(*cme)->m_next;
1.1       cgd      1354:                                m = so->so_rcv.sb_mb;
1.159     ad       1355:                        }
                   1356:                } while (m != NULL && m->m_type == MT_CONTROL);
                   1357:                if ((flags & MSG_PEEK) == 0)
                   1358:                        sbsync(&so->so_rcv, nextrecord);
                   1359:                for (; cm != NULL; cm = cmn) {
                   1360:                        cmn = cm->m_next;
                   1361:                        cm->m_next = NULL;
                   1362:                        type = mtod(cm, struct cmsghdr *)->cmsg_type;
                   1363:                        if (controlp != NULL) {
                   1364:                                if (dom->dom_externalize != NULL &&
                   1365:                                    type == SCM_RIGHTS) {
1.160     ad       1366:                                        sounlock(so);
1.159     ad       1367:                                        splx(s);
1.204     christos 1368:                                        error = (*dom->dom_externalize)(cm, l,
                   1369:                                            (flags & MSG_CMSG_CLOEXEC) ?
                   1370:                                            O_CLOEXEC : 0);
1.159     ad       1371:                                        s = splsoftnet();
1.160     ad       1372:                                        solock(so);
1.159     ad       1373:                                }
                   1374:                                *controlp = cm;
                   1375:                                while (*controlp != NULL)
                   1376:                                        controlp = &(*controlp)->m_next;
1.1       cgd      1377:                        } else {
1.106     itojun   1378:                                /*
                   1379:                                 * Dispose of any SCM_RIGHTS message that went
                   1380:                                 * through the read path rather than recv.
                   1381:                                 */
1.159     ad       1382:                                if (dom->dom_dispose != NULL &&
                   1383:                                    type == SCM_RIGHTS) {
1.160     ad       1384:                                        sounlock(so);
1.159     ad       1385:                                        (*dom->dom_dispose)(cm);
1.160     ad       1386:                                        solock(so);
1.159     ad       1387:                                }
                   1388:                                m_freem(cm);
1.1       cgd      1389:                        }
                   1390:                }
1.159     ad       1391:                if (m != NULL)
                   1392:                        nextrecord = so->so_rcv.sb_mb->m_nextpkt;
                   1393:                else
                   1394:                        nextrecord = so->so_rcv.sb_mb;
                   1395:                orig_resid = 0;
1.1       cgd      1396:        }
1.69      thorpej  1397:
1.159     ad       1398:        /* If m is non-NULL, we have some data to read. */
                   1399:        if (__predict_true(m != NULL)) {
1.1       cgd      1400:                type = m->m_type;
                   1401:                if (type == MT_OOBDATA)
                   1402:                        flags |= MSG_OOB;
                   1403:        }
1.69      thorpej  1404:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
                   1405:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
                   1406:
1.1       cgd      1407:        moff = 0;
                   1408:        offset = 0;
1.144     dyoung   1409:        while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1       cgd      1410:                if (m->m_type == MT_OOBDATA) {
                   1411:                        if (type != MT_OOBDATA)
                   1412:                                break;
                   1413:                } else if (type == MT_OOBDATA)
                   1414:                        break;
                   1415: #ifdef DIAGNOSTIC
                   1416:                else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
                   1417:                        panic("receive 3");
                   1418: #endif
                   1419:                so->so_state &= ~SS_RCVATMARK;
1.196     dsl      1420:                wakeup_state = 0;
1.1       cgd      1421:                len = uio->uio_resid;
                   1422:                if (so->so_oobmark && len > so->so_oobmark - offset)
                   1423:                        len = so->so_oobmark - offset;
                   1424:                if (len > m->m_len - moff)
                   1425:                        len = m->m_len - moff;
                   1426:                /*
                   1427:                 * If mp is set, just pass back the mbufs.
                   1428:                 * Otherwise copy them out via the uio, then free.
                   1429:                 * Sockbuf must be consistent here (points to current mbuf,
                   1430:                 * it points to next record) when we drop priority;
                   1431:                 * we must note any additions to the sockbuf when we
                   1432:                 * block interrupts again.
                   1433:                 */
1.144     dyoung   1434:                if (mp == NULL) {
1.69      thorpej  1435:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
                   1436:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160     ad       1437:                        sounlock(so);
1.1       cgd      1438:                        splx(s);
1.134     christos 1439:                        error = uiomove(mtod(m, char *) + moff, (int)len, uio);
1.20      mycroft  1440:                        s = splsoftnet();
1.160     ad       1441:                        solock(so);
1.144     dyoung   1442:                        if (error != 0) {
1.67      he       1443:                                /*
                   1444:                                 * If any part of the record has been removed
                   1445:                                 * (such as the MT_SONAME mbuf, which will
                   1446:                                 * happen when PR_ADDR, and thus also
                   1447:                                 * PR_ATOMIC, is set), then drop the entire
                   1448:                                 * record to maintain the atomicity of the
                   1449:                                 * receive operation.
                   1450:                                 *
                   1451:                                 * This avoids a later panic("receive 1a")
                   1452:                                 * when compiled with DIAGNOSTIC.
                   1453:                                 */
1.146     dyoung   1454:                                if (m && mbuf_removed && atomic)
1.67      he       1455:                                        (void) sbdroprecord(&so->so_rcv);
                   1456:
1.57      jdolecek 1457:                                goto release;
1.67      he       1458:                        }
1.1       cgd      1459:                } else
                   1460:                        uio->uio_resid -= len;
                   1461:                if (len == m->m_len - moff) {
                   1462:                        if (m->m_flags & M_EOR)
                   1463:                                flags |= MSG_EOR;
                   1464:                        if (flags & MSG_PEEK) {
                   1465:                                m = m->m_next;
                   1466:                                moff = 0;
                   1467:                        } else {
                   1468:                                nextrecord = m->m_nextpkt;
                   1469:                                sbfree(&so->so_rcv, m);
                   1470:                                if (mp) {
                   1471:                                        *mp = m;
                   1472:                                        mp = &m->m_next;
                   1473:                                        so->so_rcv.sb_mb = m = m->m_next;
1.140     dyoung   1474:                                        *mp = NULL;
1.1       cgd      1475:                                } else {
                   1476:                                        MFREE(m, so->so_rcv.sb_mb);
                   1477:                                        m = so->so_rcv.sb_mb;
                   1478:                                }
1.69      thorpej  1479:                                /*
                   1480:                                 * If m != NULL, we also know that
                   1481:                                 * so->so_rcv.sb_mb != NULL.
                   1482:                                 */
                   1483:                                KASSERT(so->so_rcv.sb_mb == m);
                   1484:                                if (m) {
1.1       cgd      1485:                                        m->m_nextpkt = nextrecord;
1.69      thorpej  1486:                                        if (nextrecord == NULL)
                   1487:                                                so->so_rcv.sb_lastrecord = m;
                   1488:                                } else {
                   1489:                                        so->so_rcv.sb_mb = nextrecord;
1.70      thorpej  1490:                                        SB_EMPTY_FIXUP(&so->so_rcv);
1.69      thorpej  1491:                                }
                   1492:                                SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
                   1493:                                SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1       cgd      1494:                        }
1.144     dyoung   1495:                } else if (flags & MSG_PEEK)
                   1496:                        moff += len;
                   1497:                else {
1.160     ad       1498:                        if (mp != NULL) {
                   1499:                                mt = m_copym(m, 0, len, M_NOWAIT);
                   1500:                                if (__predict_false(mt == NULL)) {
                   1501:                                        sounlock(so);
                   1502:                                        mt = m_copym(m, 0, len, M_WAIT);
                   1503:                                        solock(so);
                   1504:                                }
                   1505:                                *mp = mt;
                   1506:                        }
1.144     dyoung   1507:                        m->m_data += len;
                   1508:                        m->m_len -= len;
                   1509:                        so->so_rcv.sb_cc -= len;
1.1       cgd      1510:                }
                   1511:                if (so->so_oobmark) {
                   1512:                        if ((flags & MSG_PEEK) == 0) {
                   1513:                                so->so_oobmark -= len;
                   1514:                                if (so->so_oobmark == 0) {
                   1515:                                        so->so_state |= SS_RCVATMARK;
                   1516:                                        break;
                   1517:                                }
1.7       cgd      1518:                        } else {
1.1       cgd      1519:                                offset += len;
1.7       cgd      1520:                                if (offset == so->so_oobmark)
                   1521:                                        break;
                   1522:                        }
1.1       cgd      1523:                }
                   1524:                if (flags & MSG_EOR)
                   1525:                        break;
                   1526:                /*
                   1527:                 * If the MSG_WAITALL flag is set (for non-atomic socket),
                   1528:                 * we must not quit until "uio->uio_resid == 0" or an error
                   1529:                 * termination.  If a signal/timeout occurs, return
                   1530:                 * with a short count but without error.
                   1531:                 * Keep sockbuf locked against other readers.
                   1532:                 */
1.144     dyoung   1533:                while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3       andrew   1534:                    !sosendallatonce(so) && !nextrecord) {
1.1       cgd      1535:                        if (so->so_error || so->so_state & SS_CANTRCVMORE)
                   1536:                                break;
1.68      matt     1537:                        /*
                   1538:                         * If we are peeking and the socket receive buffer is
                   1539:                         * full, stop since we can't get more data to peek at.
                   1540:                         */
                   1541:                        if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
                   1542:                                break;
                   1543:                        /*
                   1544:                         * If we've drained the socket buffer, tell the
                   1545:                         * protocol in case it needs to do something to
                   1546:                         * get it filled again.
                   1547:                         */
                   1548:                        if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
                   1549:                                (*pr->pr_usrreq)(so, PRU_RCVD,
1.140     dyoung   1550:                                    NULL, (struct mbuf *)(long)flags, NULL, l);
1.69      thorpej  1551:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
                   1552:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196     dsl      1553:                        if (wakeup_state & SS_RESTARTSYS)
                   1554:                                error = ERESTART;
                   1555:                        else
                   1556:                                error = sbwait(&so->so_rcv);
1.144     dyoung   1557:                        if (error != 0) {
1.1       cgd      1558:                                sbunlock(&so->so_rcv);
1.160     ad       1559:                                sounlock(so);
1.1       cgd      1560:                                splx(s);
1.144     dyoung   1561:                                return 0;
1.1       cgd      1562:                        }
1.21      christos 1563:                        if ((m = so->so_rcv.sb_mb) != NULL)
1.1       cgd      1564:                                nextrecord = m->m_nextpkt;
1.196     dsl      1565:                        wakeup_state = so->so_state;
1.1       cgd      1566:                }
                   1567:        }
1.3       andrew   1568:
1.146     dyoung   1569:        if (m && atomic) {
1.3       andrew   1570:                flags |= MSG_TRUNC;
                   1571:                if ((flags & MSG_PEEK) == 0)
                   1572:                        (void) sbdroprecord(&so->so_rcv);
                   1573:        }
1.1       cgd      1574:        if ((flags & MSG_PEEK) == 0) {
1.144     dyoung   1575:                if (m == NULL) {
1.69      thorpej  1576:                        /*
1.70      thorpej  1577:                         * First part is an inline SB_EMPTY_FIXUP().  Second
1.69      thorpej  1578:                         * part makes sure sb_lastrecord is up-to-date if
                   1579:                         * there is still data in the socket buffer.
                   1580:                         */
1.1       cgd      1581:                        so->so_rcv.sb_mb = nextrecord;
1.69      thorpej  1582:                        if (so->so_rcv.sb_mb == NULL) {
                   1583:                                so->so_rcv.sb_mbtail = NULL;
                   1584:                                so->so_rcv.sb_lastrecord = NULL;
                   1585:                        } else if (nextrecord->m_nextpkt == NULL)
                   1586:                                so->so_rcv.sb_lastrecord = nextrecord;
                   1587:                }
                   1588:                SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
                   1589:                SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1       cgd      1590:                if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.140     dyoung   1591:                        (*pr->pr_usrreq)(so, PRU_RCVD, NULL,
                   1592:                            (struct mbuf *)(long)flags, NULL, l);
1.1       cgd      1593:        }
1.3       andrew   1594:        if (orig_resid == uio->uio_resid && orig_resid &&
                   1595:            (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
                   1596:                sbunlock(&so->so_rcv);
                   1597:                goto restart;
                   1598:        }
1.108     perry    1599:
1.144     dyoung   1600:        if (flagsp != NULL)
1.1       cgd      1601:                *flagsp |= flags;
1.54      lukem    1602:  release:
1.1       cgd      1603:        sbunlock(&so->so_rcv);
1.160     ad       1604:        sounlock(so);
1.1       cgd      1605:        splx(s);
1.144     dyoung   1606:        return error;
1.1       cgd      1607: }
                   1608:
1.14      mycroft  1609: int
1.54      lukem    1610: soshutdown(struct socket *so, int how)
1.1       cgd      1611: {
1.99      matt     1612:        const struct protosw    *pr;
1.160     ad       1613:        int     error;
                   1614:
                   1615:        KASSERT(solocked(so));
1.34      kleink   1616:
1.54      lukem    1617:        pr = so->so_proto;
1.34      kleink   1618:        if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
                   1619:                return (EINVAL);
1.1       cgd      1620:
1.160     ad       1621:        if (how == SHUT_RD || how == SHUT_RDWR) {
1.1       cgd      1622:                sorflush(so);
1.160     ad       1623:                error = 0;
                   1624:        }
1.34      kleink   1625:        if (how == SHUT_WR || how == SHUT_RDWR)
1.160     ad       1626:                error = (*pr->pr_usrreq)(so, PRU_SHUTDOWN, NULL,
1.140     dyoung   1627:                    NULL, NULL, NULL);
1.160     ad       1628:
                   1629:        return error;
1.1       cgd      1630: }
                   1631:
1.195     dsl      1632: void
1.196     dsl      1633: sorestart(struct socket *so)
1.188     ad       1634: {
1.196     dsl      1635:        /*
                   1636:         * An application has called close() on an fd on which another
                   1637:         * of its threads has called a socket system call.
                   1638:         * Mark this and wake everyone up, and code that would block again
                   1639:         * instead returns ERESTART.
                   1640:         * On system call re-entry the fd is validated and EBADF returned.
                   1641:         * Any other fd will block again on the 2nd syscall.
                   1642:         */
1.188     ad       1643:        solock(so);
1.196     dsl      1644:        so->so_state |= SS_RESTARTSYS;
1.188     ad       1645:        cv_broadcast(&so->so_cv);
1.196     dsl      1646:        cv_broadcast(&so->so_snd.sb_cv);
                   1647:        cv_broadcast(&so->so_rcv.sb_cv);
1.188     ad       1648:        sounlock(so);
                   1649: }
                   1650:
1.14      mycroft  1651: void
1.54      lukem    1652: sorflush(struct socket *so)
1.1       cgd      1653: {
1.54      lukem    1654:        struct sockbuf  *sb, asb;
1.99      matt     1655:        const struct protosw    *pr;
1.160     ad       1656:
                   1657:        KASSERT(solocked(so));
1.1       cgd      1658:
1.54      lukem    1659:        sb = &so->so_rcv;
                   1660:        pr = so->so_proto;
1.160     ad       1661:        socantrcvmore(so);
1.1       cgd      1662:        sb->sb_flags |= SB_NOINTR;
1.160     ad       1663:        (void )sblock(sb, M_WAITOK);
1.1       cgd      1664:        sbunlock(sb);
                   1665:        asb = *sb;
1.86      wrstuden 1666:        /*
                   1667:         * Clear most of the sockbuf structure, but leave some of the
                   1668:         * fields valid.
                   1669:         */
                   1670:        memset(&sb->sb_startzero, 0,
                   1671:            sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160     ad       1672:        if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
                   1673:                sounlock(so);
1.1       cgd      1674:                (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160     ad       1675:                solock(so);
                   1676:        }
1.98      christos 1677:        sbrelease(&asb, so);
1.1       cgd      1678: }
                   1679:
1.171     plunky   1680: /*
                   1681:  * internal set SOL_SOCKET options
                   1682:  */
1.142     dyoung   1683: static int
1.171     plunky   1684: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1       cgd      1685: {
1.182     christos 1686:        int error = EINVAL, optval, opt;
1.171     plunky   1687:        struct linger l;
                   1688:        struct timeval tv;
1.142     dyoung   1689:
1.179     christos 1690:        switch ((opt = sopt->sopt_name)) {
1.142     dyoung   1691:
1.170     tls      1692:        case SO_ACCEPTFILTER:
1.177     ad       1693:                error = accept_filt_setopt(so, sopt);
                   1694:                KASSERT(solocked(so));
1.170     tls      1695:                break;
                   1696:
1.171     plunky   1697:        case SO_LINGER:
                   1698:                error = sockopt_get(sopt, &l, sizeof(l));
1.177     ad       1699:                solock(so);
1.171     plunky   1700:                if (error)
1.177     ad       1701:                        break;
1.171     plunky   1702:                if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1.177     ad       1703:                    l.l_linger > (INT_MAX / hz)) {
                   1704:                        error = EDOM;
                   1705:                        break;
                   1706:                }
1.171     plunky   1707:                so->so_linger = l.l_linger;
                   1708:                if (l.l_onoff)
                   1709:                        so->so_options |= SO_LINGER;
                   1710:                else
                   1711:                        so->so_options &= ~SO_LINGER;
1.177     ad       1712:                break;
1.1       cgd      1713:
1.142     dyoung   1714:        case SO_DEBUG:
                   1715:        case SO_KEEPALIVE:
                   1716:        case SO_DONTROUTE:
                   1717:        case SO_USELOOPBACK:
                   1718:        case SO_BROADCAST:
                   1719:        case SO_REUSEADDR:
                   1720:        case SO_REUSEPORT:
                   1721:        case SO_OOBINLINE:
                   1722:        case SO_TIMESTAMP:
1.207   ! christos 1723:        case SO_NOSIGPIPE:
1.184     christos 1724: #ifdef SO_OTIMESTAMP
                   1725:        case SO_OTIMESTAMP:
                   1726: #endif
1.171     plunky   1727:                error = sockopt_getint(sopt, &optval);
1.177     ad       1728:                solock(so);
1.171     plunky   1729:                if (error)
1.177     ad       1730:                        break;
1.171     plunky   1731:                if (optval)
1.179     christos 1732:                        so->so_options |= opt;
1.142     dyoung   1733:                else
1.179     christos 1734:                        so->so_options &= ~opt;
1.142     dyoung   1735:                break;
                   1736:
                   1737:        case SO_SNDBUF:
                   1738:        case SO_RCVBUF:
                   1739:        case SO_SNDLOWAT:
                   1740:        case SO_RCVLOWAT:
1.171     plunky   1741:                error = sockopt_getint(sopt, &optval);
1.177     ad       1742:                solock(so);
1.171     plunky   1743:                if (error)
1.177     ad       1744:                        break;
1.1       cgd      1745:
1.142     dyoung   1746:                /*
                   1747:                 * Values < 1 make no sense for any of these
                   1748:                 * options, so disallow them.
                   1749:                 */
1.177     ad       1750:                if (optval < 1) {
                   1751:                        error = EINVAL;
                   1752:                        break;
                   1753:                }
1.1       cgd      1754:
1.179     christos 1755:                switch (opt) {
1.171     plunky   1756:                case SO_SNDBUF:
1.177     ad       1757:                        if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
                   1758:                                error = ENOBUFS;
                   1759:                                break;
                   1760:                        }
1.171     plunky   1761:                        so->so_snd.sb_flags &= ~SB_AUTOSIZE;
                   1762:                        break;
1.1       cgd      1763:
                   1764:                case SO_RCVBUF:
1.177     ad       1765:                        if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
                   1766:                                error = ENOBUFS;
                   1767:                                break;
                   1768:                        }
1.171     plunky   1769:                        so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142     dyoung   1770:                        break;
                   1771:
                   1772:                /*
                   1773:                 * Make sure the low-water is never greater than
                   1774:                 * the high-water.
                   1775:                 */
1.1       cgd      1776:                case SO_SNDLOWAT:
1.171     plunky   1777:                        if (optval > so->so_snd.sb_hiwat)
                   1778:                                optval = so->so_snd.sb_hiwat;
                   1779:
                   1780:                        so->so_snd.sb_lowat = optval;
1.142     dyoung   1781:                        break;
1.171     plunky   1782:
1.1       cgd      1783:                case SO_RCVLOWAT:
1.171     plunky   1784:                        if (optval > so->so_rcv.sb_hiwat)
                   1785:                                optval = so->so_rcv.sb_hiwat;
                   1786:
                   1787:                        so->so_rcv.sb_lowat = optval;
1.142     dyoung   1788:                        break;
                   1789:                }
                   1790:                break;
1.28      thorpej  1791:
1.179     christos 1792: #ifdef COMPAT_50
                   1793:        case SO_OSNDTIMEO:
                   1794:        case SO_ORCVTIMEO: {
                   1795:                struct timeval50 otv;
                   1796:                error = sockopt_get(sopt, &otv, sizeof(otv));
1.186     pooka    1797:                if (error) {
                   1798:                        solock(so);
1.183     christos 1799:                        break;
1.186     pooka    1800:                }
1.179     christos 1801:                timeval50_to_timeval(&otv, &tv);
                   1802:                opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182     christos 1803:                error = 0;
1.179     christos 1804:                /*FALLTHROUGH*/
                   1805:        }
                   1806: #endif /* COMPAT_50 */
                   1807:
1.142     dyoung   1808:        case SO_SNDTIMEO:
                   1809:        case SO_RCVTIMEO:
1.182     christos 1810:                if (error)
1.179     christos 1811:                        error = sockopt_get(sopt, &tv, sizeof(tv));
1.177     ad       1812:                solock(so);
1.171     plunky   1813:                if (error)
1.177     ad       1814:                        break;
1.171     plunky   1815:
1.177     ad       1816:                if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
                   1817:                        error = EDOM;
                   1818:                        break;
                   1819:                }
1.28      thorpej  1820:
1.171     plunky   1821:                optval = tv.tv_sec * hz + tv.tv_usec / tick;
                   1822:                if (optval == 0 && tv.tv_usec != 0)
                   1823:                        optval = 1;
1.28      thorpej  1824:
1.179     christos 1825:                switch (opt) {
1.142     dyoung   1826:                case SO_SNDTIMEO:
1.171     plunky   1827:                        so->so_snd.sb_timeo = optval;
1.1       cgd      1828:                        break;
                   1829:                case SO_RCVTIMEO:
1.171     plunky   1830:                        so->so_rcv.sb_timeo = optval;
1.142     dyoung   1831:                        break;
                   1832:                }
                   1833:                break;
1.1       cgd      1834:
1.142     dyoung   1835:        default:
1.177     ad       1836:                solock(so);
                   1837:                error = ENOPROTOOPT;
                   1838:                break;
1.142     dyoung   1839:        }
1.177     ad       1840:        KASSERT(solocked(so));
                   1841:        return error;
1.142     dyoung   1842: }
1.1       cgd      1843:
1.142     dyoung   1844: int
1.171     plunky   1845: sosetopt(struct socket *so, struct sockopt *sopt)
1.142     dyoung   1846: {
                   1847:        int error, prerr;
1.1       cgd      1848:
1.177     ad       1849:        if (sopt->sopt_level == SOL_SOCKET) {
1.171     plunky   1850:                error = sosetopt1(so, sopt);
1.177     ad       1851:                KASSERT(solocked(so));
                   1852:        } else {
1.142     dyoung   1853:                error = ENOPROTOOPT;
1.177     ad       1854:                solock(so);
                   1855:        }
1.1       cgd      1856:
1.142     dyoung   1857:        if ((error == 0 || error == ENOPROTOOPT) &&
                   1858:            so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
                   1859:                /* give the protocol stack a shot */
1.171     plunky   1860:                prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142     dyoung   1861:                if (prerr == 0)
                   1862:                        error = 0;
                   1863:                else if (prerr != ENOPROTOOPT)
                   1864:                        error = prerr;
1.171     plunky   1865:        }
1.160     ad       1866:        sounlock(so);
1.142     dyoung   1867:        return error;
1.1       cgd      1868: }
                   1869:
1.171     plunky   1870: /*
                   1871:  * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
                   1872:  */
                   1873: int
                   1874: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
                   1875:     const void *val, size_t valsize)
                   1876: {
                   1877:        struct sockopt sopt;
                   1878:        int error;
                   1879:
                   1880:        KASSERT(valsize == 0 || val != NULL);
                   1881:
                   1882:        sockopt_init(&sopt, level, name, valsize);
                   1883:        sockopt_set(&sopt, val, valsize);
                   1884:
                   1885:        error = sosetopt(so, &sopt);
                   1886:
                   1887:        sockopt_destroy(&sopt);
                   1888:
                   1889:        return error;
                   1890: }
                   1891:
                   1892: /*
                   1893:  * internal get SOL_SOCKET options
                   1894:  */
                   1895: static int
                   1896: sogetopt1(struct socket *so, struct sockopt *sopt)
                   1897: {
1.179     christos 1898:        int error, optval, opt;
1.171     plunky   1899:        struct linger l;
                   1900:        struct timeval tv;
                   1901:
1.179     christos 1902:        switch ((opt = sopt->sopt_name)) {
1.171     plunky   1903:
                   1904:        case SO_ACCEPTFILTER:
1.177     ad       1905:                error = accept_filt_getopt(so, sopt);
1.171     plunky   1906:                break;
                   1907:
                   1908:        case SO_LINGER:
                   1909:                l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
                   1910:                l.l_linger = so->so_linger;
                   1911:
                   1912:                error = sockopt_set(sopt, &l, sizeof(l));
                   1913:                break;
                   1914:
                   1915:        case SO_USELOOPBACK:
                   1916:        case SO_DONTROUTE:
                   1917:        case SO_DEBUG:
                   1918:        case SO_KEEPALIVE:
                   1919:        case SO_REUSEADDR:
                   1920:        case SO_REUSEPORT:
                   1921:        case SO_BROADCAST:
                   1922:        case SO_OOBINLINE:
                   1923:        case SO_TIMESTAMP:
1.207   ! christos 1924:        case SO_NOSIGPIPE:
1.184     christos 1925: #ifdef SO_OTIMESTAMP
                   1926:        case SO_OTIMESTAMP:
                   1927: #endif
1.179     christos 1928:                error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171     plunky   1929:                break;
                   1930:
                   1931:        case SO_TYPE:
                   1932:                error = sockopt_setint(sopt, so->so_type);
                   1933:                break;
                   1934:
                   1935:        case SO_ERROR:
                   1936:                error = sockopt_setint(sopt, so->so_error);
                   1937:                so->so_error = 0;
                   1938:                break;
                   1939:
                   1940:        case SO_SNDBUF:
                   1941:                error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
                   1942:                break;
                   1943:
                   1944:        case SO_RCVBUF:
                   1945:                error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
                   1946:                break;
                   1947:
                   1948:        case SO_SNDLOWAT:
                   1949:                error = sockopt_setint(sopt, so->so_snd.sb_lowat);
                   1950:                break;
                   1951:
                   1952:        case SO_RCVLOWAT:
                   1953:                error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
                   1954:                break;
                   1955:
1.179     christos 1956: #ifdef COMPAT_50
                   1957:        case SO_OSNDTIMEO:
                   1958:        case SO_ORCVTIMEO: {
                   1959:                struct timeval50 otv;
                   1960:
                   1961:                optval = (opt == SO_OSNDTIMEO ?
                   1962:                     so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
                   1963:
                   1964:                otv.tv_sec = optval / hz;
                   1965:                otv.tv_usec = (optval % hz) * tick;
                   1966:
                   1967:                error = sockopt_set(sopt, &otv, sizeof(otv));
                   1968:                break;
                   1969:        }
                   1970: #endif /* COMPAT_50 */
                   1971:
1.171     plunky   1972:        case SO_SNDTIMEO:
                   1973:        case SO_RCVTIMEO:
1.179     christos 1974:                optval = (opt == SO_SNDTIMEO ?
1.171     plunky   1975:                     so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
                   1976:
                   1977:                tv.tv_sec = optval / hz;
                   1978:                tv.tv_usec = (optval % hz) * tick;
                   1979:
                   1980:                error = sockopt_set(sopt, &tv, sizeof(tv));
                   1981:                break;
                   1982:
                   1983:        case SO_OVERFLOWED:
                   1984:                error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
                   1985:                break;
                   1986:
                   1987:        default:
                   1988:                error = ENOPROTOOPT;
                   1989:                break;
                   1990:        }
                   1991:
                   1992:        return (error);
                   1993: }
                   1994:
1.14      mycroft  1995: int
1.171     plunky   1996: sogetopt(struct socket *so, struct sockopt *sopt)
1.1       cgd      1997: {
1.160     ad       1998:        int             error;
1.1       cgd      1999:
1.160     ad       2000:        solock(so);
1.171     plunky   2001:        if (sopt->sopt_level != SOL_SOCKET) {
1.1       cgd      2002:                if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160     ad       2003:                        error = ((*so->so_proto->pr_ctloutput)
1.171     plunky   2004:                            (PRCO_GETOPT, so, sopt));
1.1       cgd      2005:                } else
1.160     ad       2006:                        error = (ENOPROTOOPT);
1.1       cgd      2007:        } else {
1.171     plunky   2008:                error = sogetopt1(so, sopt);
                   2009:        }
                   2010:        sounlock(so);
                   2011:        return (error);
                   2012: }
                   2013:
                   2014: /*
                   2015:  * alloc sockopt data buffer buffer
                   2016:  *     - will be released at destroy
                   2017:  */
1.176     plunky   2018: static int
                   2019: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171     plunky   2020: {
                   2021:
                   2022:        KASSERT(sopt->sopt_size == 0);
                   2023:
1.176     plunky   2024:        if (len > sizeof(sopt->sopt_buf)) {
                   2025:                sopt->sopt_data = kmem_zalloc(len, kmflag);
                   2026:                if (sopt->sopt_data == NULL)
                   2027:                        return ENOMEM;
                   2028:        } else
1.171     plunky   2029:                sopt->sopt_data = sopt->sopt_buf;
                   2030:
                   2031:        sopt->sopt_size = len;
1.176     plunky   2032:        return 0;
1.171     plunky   2033: }
                   2034:
                   2035: /*
                   2036:  * initialise sockopt storage
1.176     plunky   2037:  *     - MAY sleep during allocation
1.171     plunky   2038:  */
                   2039: void
                   2040: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
                   2041: {
1.1       cgd      2042:
1.171     plunky   2043:        memset(sopt, 0, sizeof(*sopt));
1.1       cgd      2044:
1.171     plunky   2045:        sopt->sopt_level = level;
                   2046:        sopt->sopt_name = name;
1.176     plunky   2047:        (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171     plunky   2048: }
                   2049:
                   2050: /*
                   2051:  * destroy sockopt storage
                   2052:  *     - will release any held memory references
                   2053:  */
                   2054: void
                   2055: sockopt_destroy(struct sockopt *sopt)
                   2056: {
                   2057:
                   2058:        if (sopt->sopt_data != sopt->sopt_buf)
1.173     plunky   2059:                kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171     plunky   2060:
                   2061:        memset(sopt, 0, sizeof(*sopt));
                   2062: }
                   2063:
                   2064: /*
                   2065:  * set sockopt value
                   2066:  *     - value is copied into sockopt
1.176     plunky   2067:  *     - memory is allocated when necessary, will not sleep
1.171     plunky   2068:  */
                   2069: int
                   2070: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
                   2071: {
1.176     plunky   2072:        int error;
1.171     plunky   2073:
1.176     plunky   2074:        if (sopt->sopt_size == 0) {
                   2075:                error = sockopt_alloc(sopt, len, KM_NOSLEEP);
                   2076:                if (error)
                   2077:                        return error;
                   2078:        }
1.171     plunky   2079:
                   2080:        KASSERT(sopt->sopt_size == len);
                   2081:        memcpy(sopt->sopt_data, buf, len);
                   2082:        return 0;
                   2083: }
                   2084:
                   2085: /*
                   2086:  * common case of set sockopt integer value
                   2087:  */
                   2088: int
                   2089: sockopt_setint(struct sockopt *sopt, int val)
                   2090: {
                   2091:
                   2092:        return sockopt_set(sopt, &val, sizeof(int));
                   2093: }
                   2094:
                   2095: /*
                   2096:  * get sockopt value
                   2097:  *     - correct size must be given
                   2098:  */
                   2099: int
                   2100: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
                   2101: {
1.170     tls      2102:
1.171     plunky   2103:        if (sopt->sopt_size != len)
                   2104:                return EINVAL;
1.1       cgd      2105:
1.171     plunky   2106:        memcpy(buf, sopt->sopt_data, len);
                   2107:        return 0;
                   2108: }
1.1       cgd      2109:
1.171     plunky   2110: /*
                   2111:  * common case of get sockopt integer value
                   2112:  */
                   2113: int
                   2114: sockopt_getint(const struct sockopt *sopt, int *valp)
                   2115: {
1.1       cgd      2116:
1.171     plunky   2117:        return sockopt_get(sopt, valp, sizeof(int));
                   2118: }
1.1       cgd      2119:
1.171     plunky   2120: /*
                   2121:  * set sockopt value from mbuf
                   2122:  *     - ONLY for legacy code
                   2123:  *     - mbuf is released by sockopt
1.176     plunky   2124:  *     - will not sleep
1.171     plunky   2125:  */
                   2126: int
                   2127: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
                   2128: {
                   2129:        size_t len;
1.176     plunky   2130:        int error;
1.1       cgd      2131:
1.171     plunky   2132:        len = m_length(m);
1.1       cgd      2133:
1.176     plunky   2134:        if (sopt->sopt_size == 0) {
                   2135:                error = sockopt_alloc(sopt, len, KM_NOSLEEP);
                   2136:                if (error)
                   2137:                        return error;
                   2138:        }
1.1       cgd      2139:
1.171     plunky   2140:        KASSERT(sopt->sopt_size == len);
                   2141:        m_copydata(m, 0, len, sopt->sopt_data);
                   2142:        m_freem(m);
1.1       cgd      2143:
1.171     plunky   2144:        return 0;
                   2145: }
1.1       cgd      2146:
1.171     plunky   2147: /*
                   2148:  * get sockopt value into mbuf
                   2149:  *     - ONLY for legacy code
                   2150:  *     - mbuf to be released by the caller
1.176     plunky   2151:  *     - will not sleep
1.171     plunky   2152:  */
                   2153: struct mbuf *
                   2154: sockopt_getmbuf(const struct sockopt *sopt)
                   2155: {
                   2156:        struct mbuf *m;
1.107     darrenr  2157:
1.176     plunky   2158:        if (sopt->sopt_size > MCLBYTES)
                   2159:                return NULL;
                   2160:
                   2161:        m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171     plunky   2162:        if (m == NULL)
                   2163:                return NULL;
                   2164:
1.176     plunky   2165:        if (sopt->sopt_size > MLEN) {
                   2166:                MCLGET(m, M_DONTWAIT);
                   2167:                if ((m->m_flags & M_EXT) == 0) {
                   2168:                        m_free(m);
                   2169:                        return NULL;
                   2170:                }
1.1       cgd      2171:        }
1.176     plunky   2172:
                   2173:        memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
                   2174:        m->m_len = sopt->sopt_size;
1.160     ad       2175:
1.171     plunky   2176:        return m;
1.1       cgd      2177: }
                   2178:
1.14      mycroft  2179: void
1.54      lukem    2180: sohasoutofband(struct socket *so)
1.1       cgd      2181: {
1.153     rmind    2182:
1.90      christos 2183:        fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189     ad       2184:        selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1       cgd      2185: }
1.72      jdolecek 2186:
                   2187: static void
                   2188: filt_sordetach(struct knote *kn)
                   2189: {
                   2190:        struct socket   *so;
                   2191:
1.155     ad       2192:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2193:        solock(so);
1.73      christos 2194:        SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
                   2195:        if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72      jdolecek 2196:                so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160     ad       2197:        sounlock(so);
1.72      jdolecek 2198: }
                   2199:
                   2200: /*ARGSUSED*/
                   2201: static int
1.129     yamt     2202: filt_soread(struct knote *kn, long hint)
1.72      jdolecek 2203: {
                   2204:        struct socket   *so;
1.160     ad       2205:        int rv;
1.72      jdolecek 2206:
1.155     ad       2207:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2208:        if (hint != NOTE_SUBMIT)
                   2209:                solock(so);
1.72      jdolecek 2210:        kn->kn_data = so->so_rcv.sb_cc;
                   2211:        if (so->so_state & SS_CANTRCVMORE) {
1.108     perry    2212:                kn->kn_flags |= EV_EOF;
1.72      jdolecek 2213:                kn->kn_fflags = so->so_error;
1.160     ad       2214:                rv = 1;
                   2215:        } else if (so->so_error)        /* temporary udp error */
                   2216:                rv = 1;
                   2217:        else if (kn->kn_sfflags & NOTE_LOWAT)
                   2218:                rv = (kn->kn_data >= kn->kn_sdata);
                   2219:        else
                   2220:                rv = (kn->kn_data >= so->so_rcv.sb_lowat);
                   2221:        if (hint != NOTE_SUBMIT)
                   2222:                sounlock(so);
                   2223:        return rv;
1.72      jdolecek 2224: }
                   2225:
                   2226: static void
                   2227: filt_sowdetach(struct knote *kn)
                   2228: {
                   2229:        struct socket   *so;
                   2230:
1.155     ad       2231:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2232:        solock(so);
1.73      christos 2233:        SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
                   2234:        if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72      jdolecek 2235:                so->so_snd.sb_flags &= ~SB_KNOTE;
1.160     ad       2236:        sounlock(so);
1.72      jdolecek 2237: }
                   2238:
                   2239: /*ARGSUSED*/
                   2240: static int
1.129     yamt     2241: filt_sowrite(struct knote *kn, long hint)
1.72      jdolecek 2242: {
                   2243:        struct socket   *so;
1.160     ad       2244:        int rv;
1.72      jdolecek 2245:
1.155     ad       2246:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2247:        if (hint != NOTE_SUBMIT)
                   2248:                solock(so);
1.72      jdolecek 2249:        kn->kn_data = sbspace(&so->so_snd);
                   2250:        if (so->so_state & SS_CANTSENDMORE) {
1.108     perry    2251:                kn->kn_flags |= EV_EOF;
1.72      jdolecek 2252:                kn->kn_fflags = so->so_error;
1.160     ad       2253:                rv = 1;
                   2254:        } else if (so->so_error)        /* temporary udp error */
                   2255:                rv = 1;
                   2256:        else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72      jdolecek 2257:            (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160     ad       2258:                rv = 0;
                   2259:        else if (kn->kn_sfflags & NOTE_LOWAT)
                   2260:                rv = (kn->kn_data >= kn->kn_sdata);
                   2261:        else
                   2262:                rv = (kn->kn_data >= so->so_snd.sb_lowat);
                   2263:        if (hint != NOTE_SUBMIT)
                   2264:                sounlock(so);
                   2265:        return rv;
1.72      jdolecek 2266: }
                   2267:
                   2268: /*ARGSUSED*/
                   2269: static int
1.129     yamt     2270: filt_solisten(struct knote *kn, long hint)
1.72      jdolecek 2271: {
                   2272:        struct socket   *so;
1.160     ad       2273:        int rv;
1.72      jdolecek 2274:
1.155     ad       2275:        so = ((file_t *)kn->kn_obj)->f_data;
1.72      jdolecek 2276:
                   2277:        /*
                   2278:         * Set kn_data to number of incoming connections, not
                   2279:         * counting partial (incomplete) connections.
1.108     perry    2280:         */
1.160     ad       2281:        if (hint != NOTE_SUBMIT)
                   2282:                solock(so);
1.72      jdolecek 2283:        kn->kn_data = so->so_qlen;
1.160     ad       2284:        rv = (kn->kn_data > 0);
                   2285:        if (hint != NOTE_SUBMIT)
                   2286:                sounlock(so);
                   2287:        return rv;
1.72      jdolecek 2288: }
                   2289:
                   2290: static const struct filterops solisten_filtops =
                   2291:        { 1, NULL, filt_sordetach, filt_solisten };
                   2292: static const struct filterops soread_filtops =
                   2293:        { 1, NULL, filt_sordetach, filt_soread };
                   2294: static const struct filterops sowrite_filtops =
                   2295:        { 1, NULL, filt_sowdetach, filt_sowrite };
                   2296:
                   2297: int
1.129     yamt     2298: soo_kqfilter(struct file *fp, struct knote *kn)
1.72      jdolecek 2299: {
                   2300:        struct socket   *so;
                   2301:        struct sockbuf  *sb;
                   2302:
1.155     ad       2303:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2304:        solock(so);
1.72      jdolecek 2305:        switch (kn->kn_filter) {
                   2306:        case EVFILT_READ:
                   2307:                if (so->so_options & SO_ACCEPTCONN)
                   2308:                        kn->kn_fop = &solisten_filtops;
                   2309:                else
                   2310:                        kn->kn_fop = &soread_filtops;
                   2311:                sb = &so->so_rcv;
                   2312:                break;
                   2313:        case EVFILT_WRITE:
                   2314:                kn->kn_fop = &sowrite_filtops;
                   2315:                sb = &so->so_snd;
                   2316:                break;
                   2317:        default:
1.160     ad       2318:                sounlock(so);
1.149     pooka    2319:                return (EINVAL);
1.72      jdolecek 2320:        }
1.73      christos 2321:        SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72      jdolecek 2322:        sb->sb_flags |= SB_KNOTE;
1.160     ad       2323:        sounlock(so);
1.72      jdolecek 2324:        return (0);
                   2325: }
                   2326:
1.154     ad       2327: static int
                   2328: sodopoll(struct socket *so, int events)
                   2329: {
                   2330:        int revents;
                   2331:
                   2332:        revents = 0;
                   2333:
                   2334:        if (events & (POLLIN | POLLRDNORM))
                   2335:                if (soreadable(so))
                   2336:                        revents |= events & (POLLIN | POLLRDNORM);
                   2337:
                   2338:        if (events & (POLLOUT | POLLWRNORM))
                   2339:                if (sowritable(so))
                   2340:                        revents |= events & (POLLOUT | POLLWRNORM);
                   2341:
                   2342:        if (events & (POLLPRI | POLLRDBAND))
                   2343:                if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
                   2344:                        revents |= events & (POLLPRI | POLLRDBAND);
                   2345:
                   2346:        return revents;
                   2347: }
                   2348:
                   2349: int
                   2350: sopoll(struct socket *so, int events)
                   2351: {
                   2352:        int revents = 0;
                   2353:
1.160     ad       2354: #ifndef DIAGNOSTIC
                   2355:        /*
                   2356:         * Do a quick, unlocked check in expectation that the socket
                   2357:         * will be ready for I/O.  Don't do this check if DIAGNOSTIC,
                   2358:         * as the solocked() assertions will fail.
                   2359:         */
1.154     ad       2360:        if ((revents = sodopoll(so, events)) != 0)
                   2361:                return revents;
1.160     ad       2362: #endif
1.154     ad       2363:
1.160     ad       2364:        solock(so);
1.154     ad       2365:        if ((revents = sodopoll(so, events)) == 0) {
                   2366:                if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
                   2367:                        selrecord(curlwp, &so->so_rcv.sb_sel);
1.160     ad       2368:                        so->so_rcv.sb_flags |= SB_NOTIFY;
1.154     ad       2369:                }
                   2370:
                   2371:                if (events & (POLLOUT | POLLWRNORM)) {
                   2372:                        selrecord(curlwp, &so->so_snd.sb_sel);
1.160     ad       2373:                        so->so_snd.sb_flags |= SB_NOTIFY;
1.154     ad       2374:                }
                   2375:        }
1.160     ad       2376:        sounlock(so);
1.154     ad       2377:
                   2378:        return revents;
                   2379: }
                   2380:
                   2381:
1.94      yamt     2382: #include <sys/sysctl.h>
                   2383:
                   2384: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
                   2385:
                   2386: /*
                   2387:  * sysctl helper routine for kern.somaxkva.  ensures that the given
                   2388:  * value is not too small.
                   2389:  * (XXX should we maybe make sure it's not too large as well?)
                   2390:  */
                   2391: static int
                   2392: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
                   2393: {
                   2394:        int error, new_somaxkva;
                   2395:        struct sysctlnode node;
                   2396:
                   2397:        new_somaxkva = somaxkva;
                   2398:        node = *rnode;
                   2399:        node.sysctl_data = &new_somaxkva;
                   2400:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2401:        if (error || newp == NULL)
                   2402:                return (error);
                   2403:
                   2404:        if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
                   2405:                return (EINVAL);
                   2406:
1.136     ad       2407:        mutex_enter(&so_pendfree_lock);
1.94      yamt     2408:        somaxkva = new_somaxkva;
1.136     ad       2409:        cv_broadcast(&socurkva_cv);
                   2410:        mutex_exit(&so_pendfree_lock);
1.94      yamt     2411:
                   2412:        return (error);
                   2413: }
                   2414:
1.178     pooka    2415: static void
1.187     cegger   2416: sysctl_kern_somaxkva_setup(void)
1.94      yamt     2417: {
                   2418:
1.178     pooka    2419:        KASSERT(socket_sysctllog == NULL);
                   2420:        sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97      atatat   2421:                       CTLFLAG_PERMANENT,
                   2422:                       CTLTYPE_NODE, "kern", NULL,
                   2423:                       NULL, 0, NULL, 0,
                   2424:                       CTL_KERN, CTL_EOL);
                   2425:
1.178     pooka    2426:        sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97      atatat   2427:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103     atatat   2428:                       CTLTYPE_INT, "somaxkva",
                   2429:                       SYSCTL_DESCR("Maximum amount of kernel memory to be "
                   2430:                                    "used for socket buffers"),
1.94      yamt     2431:                       sysctl_kern_somaxkva, 0, NULL, 0,
                   2432:                       CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
                   2433: }

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