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Annotation of src/sys/kern/uipc_socket.c, Revision 1.239

1.239   ! rtr         1: /*     $NetBSD: uipc_socket.c,v 1.238 2015/04/05 23:19:56 rtr 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:
1.222     rmind      65: /*
                     66:  * Socket operation routines.
                     67:  *
                     68:  * These routines are called by the routines in sys_socket.c or from a
                     69:  * system process, and implement the semantics of socket operations by
                     70:  * switching out to the protocol specific routines.
                     71:  */
                     72:
1.59      lukem      73: #include <sys/cdefs.h>
1.239   ! rtr        74: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.238 2015/04/05 23:19:56 rtr Exp $");
1.64      thorpej    75:
1.179     christos   76: #include "opt_compat_netbsd.h"
1.64      thorpej    77: #include "opt_sock_counters.h"
                     78: #include "opt_sosend_loan.h"
1.81      martin     79: #include "opt_mbuftrace.h"
1.84      ragge      80: #include "opt_somaxkva.h"
1.167     ad         81: #include "opt_multiprocessor.h"        /* XXX */
1.1       cgd        82:
1.9       mycroft    83: #include <sys/param.h>
                     84: #include <sys/systm.h>
                     85: #include <sys/proc.h>
                     86: #include <sys/file.h>
1.142     dyoung     87: #include <sys/filedesc.h>
1.173     plunky     88: #include <sys/kmem.h>
1.9       mycroft    89: #include <sys/mbuf.h>
                     90: #include <sys/domain.h>
                     91: #include <sys/kernel.h>
                     92: #include <sys/protosw.h>
                     93: #include <sys/socket.h>
                     94: #include <sys/socketvar.h>
1.21      christos   95: #include <sys/signalvar.h>
1.9       mycroft    96: #include <sys/resourcevar.h>
1.174     pooka      97: #include <sys/uidinfo.h>
1.72      jdolecek   98: #include <sys/event.h>
1.89      christos   99: #include <sys/poll.h>
1.118     elad      100: #include <sys/kauth.h>
1.136     ad        101: #include <sys/mutex.h>
                    102: #include <sys/condvar.h>
1.205     bouyer    103: #include <sys/kthread.h>
1.37      thorpej   104:
1.179     christos  105: #ifdef COMPAT_50
                    106: #include <compat/sys/time.h>
1.184     christos  107: #include <compat/sys/socket.h>
1.179     christos  108: #endif
                    109:
1.202     uebayasi  110: #include <uvm/uvm_extern.h>
                    111: #include <uvm/uvm_loan.h>
                    112: #include <uvm/uvm_page.h>
1.64      thorpej   113:
1.77      thorpej   114: MALLOC_DEFINE(M_SONAME, "soname", "socket name");
1.37      thorpej   115:
1.142     dyoung    116: extern const struct fileops socketops;
                    117:
1.54      lukem     118: extern int     somaxconn;                      /* patchable (XXX sysctl) */
                    119: int            somaxconn = SOMAXCONN;
1.160     ad        120: kmutex_t       *softnet_lock;
1.49      jonathan  121:
1.64      thorpej   122: #ifdef SOSEND_COUNTERS
                    123: #include <sys/device.h>
                    124:
1.113     thorpej   125: static struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   126:     NULL, "sosend", "loan big");
1.113     thorpej   127: static struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   128:     NULL, "sosend", "copy big");
1.113     thorpej   129: static struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   130:     NULL, "sosend", "copy small");
1.113     thorpej   131: static struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   132:     NULL, "sosend", "kva limit");
                    133:
                    134: #define        SOSEND_COUNTER_INCR(ev)         (ev)->ev_count++
                    135:
1.101     matt      136: EVCNT_ATTACH_STATIC(sosend_loan_big);
                    137: EVCNT_ATTACH_STATIC(sosend_copy_big);
                    138: EVCNT_ATTACH_STATIC(sosend_copy_small);
                    139: EVCNT_ATTACH_STATIC(sosend_kvalimit);
1.64      thorpej   140: #else
                    141:
                    142: #define        SOSEND_COUNTER_INCR(ev)         /* nothing */
                    143:
                    144: #endif /* SOSEND_COUNTERS */
                    145:
1.167     ad        146: #if defined(SOSEND_NO_LOAN) || defined(MULTIPROCESSOR)
1.121     yamt      147: int sock_loan_thresh = -1;
1.71      thorpej   148: #else
1.121     yamt      149: int sock_loan_thresh = 4096;
1.65      thorpej   150: #endif
1.64      thorpej   151:
1.136     ad        152: static kmutex_t so_pendfree_lock;
1.205     bouyer    153: static struct mbuf *so_pendfree = NULL;
1.64      thorpej   154:
1.84      ragge     155: #ifndef SOMAXKVA
                    156: #define        SOMAXKVA (16 * 1024 * 1024)
                    157: #endif
                    158: int somaxkva = SOMAXKVA;
1.113     thorpej   159: static int socurkva;
1.136     ad        160: static kcondvar_t socurkva_cv;
1.64      thorpej   161:
1.191     elad      162: static kauth_listener_t socket_listener;
                    163:
1.64      thorpej   164: #define        SOCK_LOAN_CHUNK         65536
                    165:
1.205     bouyer    166: static void sopendfree_thread(void *);
                    167: static kcondvar_t pendfree_thread_cv;
                    168: static lwp_t *sopendfree_lwp;
1.93      yamt      169:
1.212     pooka     170: static void sysctl_kern_socket_setup(void);
1.178     pooka     171: static struct sysctllog *socket_sysctllog;
                    172:
1.113     thorpej   173: static vsize_t
1.129     yamt      174: sokvareserve(struct socket *so, vsize_t len)
1.80      yamt      175: {
1.98      christos  176:        int error;
1.80      yamt      177:
1.136     ad        178:        mutex_enter(&so_pendfree_lock);
1.80      yamt      179:        while (socurkva + len > somaxkva) {
                    180:                SOSEND_COUNTER_INCR(&sosend_kvalimit);
1.136     ad        181:                error = cv_wait_sig(&socurkva_cv, &so_pendfree_lock);
1.98      christos  182:                if (error) {
                    183:                        len = 0;
                    184:                        break;
                    185:                }
1.80      yamt      186:        }
1.93      yamt      187:        socurkva += len;
1.136     ad        188:        mutex_exit(&so_pendfree_lock);
1.98      christos  189:        return len;
1.95      yamt      190: }
                    191:
1.113     thorpej   192: static void
1.95      yamt      193: sokvaunreserve(vsize_t len)
                    194: {
                    195:
1.136     ad        196:        mutex_enter(&so_pendfree_lock);
1.95      yamt      197:        socurkva -= len;
1.136     ad        198:        cv_broadcast(&socurkva_cv);
                    199:        mutex_exit(&so_pendfree_lock);
1.95      yamt      200: }
                    201:
                    202: /*
                    203:  * sokvaalloc: allocate kva for loan.
                    204:  */
                    205:
                    206: vaddr_t
1.209     matt      207: sokvaalloc(vaddr_t sva, vsize_t len, struct socket *so)
1.95      yamt      208: {
                    209:        vaddr_t lva;
                    210:
                    211:        /*
                    212:         * reserve kva.
                    213:         */
                    214:
1.98      christos  215:        if (sokvareserve(so, len) == 0)
                    216:                return 0;
1.93      yamt      217:
                    218:        /*
                    219:         * allocate kva.
                    220:         */
1.80      yamt      221:
1.209     matt      222:        lva = uvm_km_alloc(kernel_map, len, atop(sva) & uvmexp.colormask,
                    223:            UVM_KMF_COLORMATCH | UVM_KMF_VAONLY | UVM_KMF_WAITVA);
1.95      yamt      224:        if (lva == 0) {
                    225:                sokvaunreserve(len);
1.80      yamt      226:                return (0);
1.95      yamt      227:        }
1.80      yamt      228:
                    229:        return lva;
                    230: }
                    231:
1.93      yamt      232: /*
                    233:  * sokvafree: free kva for loan.
                    234:  */
                    235:
1.80      yamt      236: void
                    237: sokvafree(vaddr_t sva, vsize_t len)
                    238: {
1.93      yamt      239:
                    240:        /*
                    241:         * free kva.
                    242:         */
1.80      yamt      243:
1.109     yamt      244:        uvm_km_free(kernel_map, sva, len, UVM_KMF_VAONLY);
1.93      yamt      245:
                    246:        /*
                    247:         * unreserve kva.
                    248:         */
                    249:
1.95      yamt      250:        sokvaunreserve(len);
1.80      yamt      251: }
                    252:
1.64      thorpej   253: static void
1.134     christos  254: sodoloanfree(struct vm_page **pgs, void *buf, size_t size)
1.64      thorpej   255: {
1.156     yamt      256:        vaddr_t sva, eva;
1.64      thorpej   257:        vsize_t len;
1.156     yamt      258:        int npgs;
                    259:
                    260:        KASSERT(pgs != NULL);
1.64      thorpej   261:
                    262:        eva = round_page((vaddr_t) buf + size);
                    263:        sva = trunc_page((vaddr_t) buf);
                    264:        len = eva - sva;
                    265:        npgs = len >> PAGE_SHIFT;
                    266:
                    267:        pmap_kremove(sva, len);
                    268:        pmap_update(pmap_kernel());
                    269:        uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE);
1.80      yamt      270:        sokvafree(sva, len);
1.64      thorpej   271: }
                    272:
1.93      yamt      273: /*
1.205     bouyer    274:  * sopendfree_thread: free mbufs on "pendfree" list.
1.136     ad        275:  * unlock and relock so_pendfree_lock when freeing mbufs.
1.93      yamt      276:  */
                    277:
1.205     bouyer    278: static void
                    279: sopendfree_thread(void *v)
1.93      yamt      280: {
1.137     ad        281:        struct mbuf *m, *next;
1.205     bouyer    282:        size_t rv;
1.93      yamt      283:
1.205     bouyer    284:        mutex_enter(&so_pendfree_lock);
1.64      thorpej   285:
1.205     bouyer    286:        for (;;) {
                    287:                rv = 0;
                    288:                while (so_pendfree != NULL) {
                    289:                        m = so_pendfree;
                    290:                        so_pendfree = NULL;
                    291:                        mutex_exit(&so_pendfree_lock);
                    292:
                    293:                        for (; m != NULL; m = next) {
                    294:                                next = m->m_next;
                    295:                                KASSERT((~m->m_flags & (M_EXT|M_EXT_PAGES)) == 0);
                    296:                                KASSERT(m->m_ext.ext_refcnt == 0);
                    297:
                    298:                                rv += m->m_ext.ext_size;
                    299:                                sodoloanfree(m->m_ext.ext_pgs, m->m_ext.ext_buf,
                    300:                                    m->m_ext.ext_size);
                    301:                                pool_cache_put(mb_cache, m);
                    302:                        }
1.93      yamt      303:
1.205     bouyer    304:                        mutex_enter(&so_pendfree_lock);
1.93      yamt      305:                }
1.205     bouyer    306:                if (rv)
                    307:                        cv_broadcast(&socurkva_cv);
                    308:                cv_wait(&pendfree_thread_cv, &so_pendfree_lock);
1.64      thorpej   309:        }
1.205     bouyer    310:        panic("sopendfree_thread");
                    311:        /* NOTREACHED */
1.64      thorpej   312: }
                    313:
1.80      yamt      314: void
1.134     christos  315: soloanfree(struct mbuf *m, void *buf, size_t size, void *arg)
1.64      thorpej   316: {
                    317:
1.156     yamt      318:        KASSERT(m != NULL);
1.64      thorpej   319:
1.93      yamt      320:        /*
                    321:         * postpone freeing mbuf.
                    322:         *
                    323:         * we can't do it in interrupt context
                    324:         * because we need to put kva back to kernel_map.
                    325:         */
                    326:
1.136     ad        327:        mutex_enter(&so_pendfree_lock);
1.92      yamt      328:        m->m_next = so_pendfree;
                    329:        so_pendfree = m;
1.205     bouyer    330:        cv_signal(&pendfree_thread_cv);
1.136     ad        331:        mutex_exit(&so_pendfree_lock);
1.64      thorpej   332: }
                    333:
                    334: static long
                    335: sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space)
                    336: {
                    337:        struct iovec *iov = uio->uio_iov;
                    338:        vaddr_t sva, eva;
                    339:        vsize_t len;
1.156     yamt      340:        vaddr_t lva;
                    341:        int npgs, error;
                    342:        vaddr_t va;
                    343:        int i;
1.64      thorpej   344:
1.116     yamt      345:        if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace))
1.64      thorpej   346:                return (0);
                    347:
                    348:        if (iov->iov_len < (size_t) space)
                    349:                space = iov->iov_len;
                    350:        if (space > SOCK_LOAN_CHUNK)
                    351:                space = SOCK_LOAN_CHUNK;
                    352:
                    353:        eva = round_page((vaddr_t) iov->iov_base + space);
                    354:        sva = trunc_page((vaddr_t) iov->iov_base);
                    355:        len = eva - sva;
                    356:        npgs = len >> PAGE_SHIFT;
                    357:
1.79      thorpej   358:        KASSERT(npgs <= M_EXT_MAXPAGES);
                    359:
1.209     matt      360:        lva = sokvaalloc(sva, len, so);
1.64      thorpej   361:        if (lva == 0)
1.80      yamt      362:                return 0;
1.64      thorpej   363:
1.116     yamt      364:        error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len,
1.79      thorpej   365:            m->m_ext.ext_pgs, UVM_LOAN_TOPAGE);
1.64      thorpej   366:        if (error) {
1.80      yamt      367:                sokvafree(lva, len);
1.64      thorpej   368:                return (0);
                    369:        }
                    370:
                    371:        for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE)
1.79      thorpej   372:                pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]),
1.194     cegger    373:                    VM_PROT_READ, 0);
1.64      thorpej   374:        pmap_update(pmap_kernel());
                    375:
                    376:        lva += (vaddr_t) iov->iov_base & PAGE_MASK;
                    377:
1.134     christos  378:        MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so);
1.79      thorpej   379:        m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP;
1.64      thorpej   380:
                    381:        uio->uio_resid -= space;
                    382:        /* uio_offset not updated, not set/used for write(2) */
1.134     christos  383:        uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space;
1.64      thorpej   384:        uio->uio_iov->iov_len -= space;
                    385:        if (uio->uio_iov->iov_len == 0) {
                    386:                uio->uio_iov++;
                    387:                uio->uio_iovcnt--;
                    388:        }
                    389:
                    390:        return (space);
                    391: }
                    392:
1.142     dyoung    393: struct mbuf *
1.147     dyoung    394: getsombuf(struct socket *so, int type)
1.142     dyoung    395: {
                    396:        struct mbuf *m;
                    397:
1.147     dyoung    398:        m = m_get(M_WAIT, type);
1.142     dyoung    399:        MCLAIM(m, so->so_mowner);
                    400:        return m;
                    401: }
                    402:
1.191     elad      403: static int
                    404: socket_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
                    405:     void *arg0, void *arg1, void *arg2, void *arg3)
                    406: {
                    407:        int result;
                    408:        enum kauth_network_req req;
                    409:
                    410:        result = KAUTH_RESULT_DEFER;
                    411:        req = (enum kauth_network_req)arg0;
                    412:
1.193     elad      413:        if ((action != KAUTH_NETWORK_SOCKET) &&
                    414:            (action != KAUTH_NETWORK_BIND))
1.191     elad      415:                return result;
                    416:
                    417:        switch (req) {
1.193     elad      418:        case KAUTH_REQ_NETWORK_BIND_PORT:
                    419:                result = KAUTH_RESULT_ALLOW;
                    420:                break;
                    421:
1.191     elad      422:        case KAUTH_REQ_NETWORK_SOCKET_DROP: {
                    423:                /* Normal users can only drop their own connections. */
                    424:                struct socket *so = (struct socket *)arg1;
                    425:
1.220     christos  426:                if (so->so_cred && proc_uidmatch(cred, so->so_cred) == 0)
1.191     elad      427:                        result = KAUTH_RESULT_ALLOW;
                    428:
                    429:                break;
                    430:                }
                    431:
                    432:        case KAUTH_REQ_NETWORK_SOCKET_OPEN:
                    433:                /* We allow "raw" routing/bluetooth sockets to anyone. */
1.203     matt      434:                if ((u_long)arg1 == PF_ROUTE || (u_long)arg1 == PF_OROUTE
                    435:                    || (u_long)arg1 == PF_BLUETOOTH) {
1.191     elad      436:                        result = KAUTH_RESULT_ALLOW;
1.203     matt      437:                } else {
1.191     elad      438:                        /* Privileged, let secmodel handle this. */
                    439:                        if ((u_long)arg2 == SOCK_RAW)
                    440:                                break;
                    441:                }
                    442:
                    443:                result = KAUTH_RESULT_ALLOW;
                    444:
                    445:                break;
                    446:
1.192     elad      447:        case KAUTH_REQ_NETWORK_SOCKET_CANSEE:
                    448:                result = KAUTH_RESULT_ALLOW;
                    449:
                    450:                break;
                    451:
1.191     elad      452:        default:
                    453:                break;
                    454:        }
                    455:
                    456:        return result;
                    457: }
                    458:
1.119     yamt      459: void
                    460: soinit(void)
                    461: {
                    462:
1.212     pooka     463:        sysctl_kern_socket_setup();
1.178     pooka     464:
1.148     ad        465:        mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM);
1.160     ad        466:        softnet_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
1.136     ad        467:        cv_init(&socurkva_cv, "sokva");
1.205     bouyer    468:        cv_init(&pendfree_thread_cv, "sopendfr");
1.166     ad        469:        soinit2();
1.136     ad        470:
1.119     yamt      471:        /* Set the initial adjusted socket buffer size. */
                    472:        if (sb_max_set(sb_max))
                    473:                panic("bad initial sb_max value: %lu", sb_max);
                    474:
1.191     elad      475:        socket_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
                    476:            socket_listener_cb, NULL);
1.119     yamt      477: }
                    478:
1.205     bouyer    479: void
                    480: soinit1(void)
                    481: {
                    482:        int error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL,
                    483:            sopendfree_thread, NULL, &sopendfree_lwp, "sopendfree");
                    484:        if (error)
                    485:                panic("soinit1 %d", error);
                    486: }
                    487:
1.1       cgd       488: /*
1.222     rmind     489:  * socreate: create a new socket of the specified type and the protocol.
                    490:  *
                    491:  * => Caller may specify another socket for lock sharing (must not be held).
                    492:  * => Returns the new socket without lock held.
1.224     rmind     493:  */
1.3       andrew    494: int
1.160     ad        495: socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l,
                    496:         struct socket *lockso)
1.1       cgd       497: {
1.99      matt      498:        const struct protosw    *prp;
1.54      lukem     499:        struct socket   *so;
1.115     yamt      500:        uid_t           uid;
1.160     ad        501:        int             error;
                    502:        kmutex_t        *lock;
1.1       cgd       503:
1.132     elad      504:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET,
                    505:            KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type),
                    506:            KAUTH_ARG(proto));
1.140     dyoung    507:        if (error != 0)
                    508:                return error;
1.127     elad      509:
1.1       cgd       510:        if (proto)
                    511:                prp = pffindproto(dom, proto, type);
                    512:        else
                    513:                prp = pffindtype(dom, type);
1.140     dyoung    514:        if (prp == NULL) {
1.120     ginsbach  515:                /* no support for domain */
                    516:                if (pffinddomain(dom) == 0)
1.140     dyoung    517:                        return EAFNOSUPPORT;
1.120     ginsbach  518:                /* no support for socket type */
                    519:                if (proto == 0 && type != 0)
1.140     dyoung    520:                        return EPROTOTYPE;
                    521:                return EPROTONOSUPPORT;
1.120     ginsbach  522:        }
1.223     rmind     523:        if (prp->pr_usrreqs == NULL)
1.140     dyoung    524:                return EPROTONOSUPPORT;
1.1       cgd       525:        if (prp->pr_type != type)
1.140     dyoung    526:                return EPROTOTYPE;
1.160     ad        527:
                    528:        so = soget(true);
1.1       cgd       529:        so->so_type = type;
                    530:        so->so_proto = prp;
1.33      matt      531:        so->so_send = sosend;
                    532:        so->so_receive = soreceive;
1.78      matt      533: #ifdef MBUFTRACE
                    534:        so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner;
                    535:        so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner;
                    536:        so->so_mowner = &prp->pr_domain->dom_mowner;
                    537: #endif
1.138     rmind     538:        uid = kauth_cred_geteuid(l->l_cred);
1.115     yamt      539:        so->so_uidinfo = uid_find(uid);
1.168     yamt      540:        so->so_cpid = l->l_proc->p_pid;
1.224     rmind     541:
                    542:        /*
                    543:         * Lock assigned and taken during PCB attach, unless we share
                    544:         * the lock with another socket, e.g. socketpair(2) case.
                    545:         */
                    546:        if (lockso) {
1.160     ad        547:                lock = lockso->so_lock;
                    548:                so->so_lock = lock;
                    549:                mutex_obj_hold(lock);
                    550:                mutex_enter(lock);
                    551:        }
1.224     rmind     552:
                    553:        /* Attach the PCB (returns with the socket lock held). */
                    554:        error = (*prp->pr_usrreqs->pr_attach)(so, proto);
1.160     ad        555:        KASSERT(solocked(so));
1.224     rmind     556:
                    557:        if (error) {
1.222     rmind     558:                KASSERT(so->so_pcb == NULL);
1.1       cgd       559:                so->so_state |= SS_NOFDREF;
                    560:                sofree(so);
1.140     dyoung    561:                return error;
1.1       cgd       562:        }
1.198     elad      563:        so->so_cred = kauth_cred_dup(l->l_cred);
1.160     ad        564:        sounlock(so);
1.224     rmind     565:
1.1       cgd       566:        *aso = so;
1.140     dyoung    567:        return 0;
1.1       cgd       568: }
                    569:
1.222     rmind     570: /*
                    571:  * fsocreate: create a socket and a file descriptor associated with it.
                    572:  *
                    573:  * => On success, write file descriptor to fdout and return zero.
                    574:  * => On failure, return non-zero; *fdout will be undefined.
1.142     dyoung    575:  */
                    576: int
1.222     rmind     577: fsocreate(int domain, struct socket **sop, int type, int proto, int *fdout)
1.142     dyoung    578: {
1.222     rmind     579:        lwp_t *l = curlwp;
                    580:        int error, fd, flags;
                    581:        struct socket *so;
                    582:        struct file *fp;
1.142     dyoung    583:
1.222     rmind     584:        if ((error = fd_allocfile(&fp, &fd)) != 0) {
1.204     christos  585:                return error;
1.222     rmind     586:        }
                    587:        flags = type & SOCK_FLAGS_MASK;
1.204     christos  588:        fd_set_exclose(l, fd, (flags & SOCK_CLOEXEC) != 0);
1.207     christos  589:        fp->f_flag = FREAD|FWRITE|((flags & SOCK_NONBLOCK) ? FNONBLOCK : 0)|
                    590:            ((flags & SOCK_NOSIGPIPE) ? FNOSIGPIPE : 0);
1.142     dyoung    591:        fp->f_type = DTYPE_SOCKET;
                    592:        fp->f_ops = &socketops;
1.222     rmind     593:
                    594:        type &= ~SOCK_FLAGS_MASK;
                    595:        error = socreate(domain, &so, type, proto, l, NULL);
                    596:        if (error) {
1.155     ad        597:                fd_abort(curproc, fp, fd);
1.222     rmind     598:                return error;
                    599:        }
                    600:        if (flags & SOCK_NONBLOCK) {
                    601:                so->so_state |= SS_NBIO;
                    602:        }
1.235     matt      603:        fp->f_socket = so;
1.222     rmind     604:        fd_affix(curproc, fp, fd);
                    605:
                    606:        if (sop != NULL) {
                    607:                *sop = so;
1.142     dyoung    608:        }
1.222     rmind     609:        *fdout = fd;
1.142     dyoung    610:        return error;
                    611: }
                    612:
1.3       andrew    613: int
1.190     dyoung    614: sofamily(const struct socket *so)
                    615: {
                    616:        const struct protosw *pr;
                    617:        const struct domain *dom;
                    618:
                    619:        if ((pr = so->so_proto) == NULL)
                    620:                return AF_UNSPEC;
                    621:        if ((dom = pr->pr_domain) == NULL)
                    622:                return AF_UNSPEC;
                    623:        return dom->dom_family;
                    624: }
                    625:
                    626: int
1.236     rtr       627: sobind(struct socket *so, struct sockaddr *nam, struct lwp *l)
1.1       cgd       628: {
1.160     ad        629:        int     error;
1.1       cgd       630:
1.160     ad        631:        solock(so);
1.237     rtr       632:        if (nam->sa_family != so->so_proto->pr_domain->dom_family) {
                    633:                sounlock(so);
1.238     rtr       634:                return EAFNOSUPPORT;
1.237     rtr       635:        }
1.231     rtr       636:        error = (*so->so_proto->pr_usrreqs->pr_bind)(so, nam, l);
1.160     ad        637:        sounlock(so);
1.140     dyoung    638:        return error;
1.1       cgd       639: }
                    640:
1.3       andrew    641: int
1.150     elad      642: solisten(struct socket *so, int backlog, struct lwp *l)
1.1       cgd       643: {
1.160     ad        644:        int     error;
1.1       cgd       645:
1.160     ad        646:        solock(so);
1.158     ad        647:        if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163     ad        648:            SS_ISDISCONNECTING)) != 0) {
1.222     rmind     649:                sounlock(so);
                    650:                return EINVAL;
1.163     ad        651:        }
1.231     rtr       652:        error = (*so->so_proto->pr_usrreqs->pr_listen)(so, l);
1.140     dyoung    653:        if (error != 0) {
1.160     ad        654:                sounlock(so);
1.140     dyoung    655:                return error;
1.1       cgd       656:        }
1.63      matt      657:        if (TAILQ_EMPTY(&so->so_q))
1.1       cgd       658:                so->so_options |= SO_ACCEPTCONN;
                    659:        if (backlog < 0)
                    660:                backlog = 0;
1.49      jonathan  661:        so->so_qlimit = min(backlog, somaxconn);
1.160     ad        662:        sounlock(so);
1.140     dyoung    663:        return 0;
1.1       cgd       664: }
                    665:
1.21      christos  666: void
1.54      lukem     667: sofree(struct socket *so)
1.1       cgd       668: {
1.161     ad        669:        u_int refs;
1.1       cgd       670:
1.160     ad        671:        KASSERT(solocked(so));
                    672:
                    673:        if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
                    674:                sounlock(so);
1.1       cgd       675:                return;
1.160     ad        676:        }
1.43      mycroft   677:        if (so->so_head) {
                    678:                /*
                    679:                 * We must not decommission a socket that's on the accept(2)
                    680:                 * queue.  If we do, then accept(2) may hang after select(2)
                    681:                 * indicated that the listening socket was ready.
                    682:                 */
1.160     ad        683:                if (!soqremque(so, 0)) {
                    684:                        sounlock(so);
1.43      mycroft   685:                        return;
1.160     ad        686:                }
1.43      mycroft   687:        }
1.98      christos  688:        if (so->so_rcv.sb_hiwat)
1.110     christos  689:                (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98      christos  690:                    RLIM_INFINITY);
                    691:        if (so->so_snd.sb_hiwat)
1.110     christos  692:                (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98      christos  693:                    RLIM_INFINITY);
                    694:        sbrelease(&so->so_snd, so);
1.160     ad        695:        KASSERT(!cv_has_waiters(&so->so_cv));
                    696:        KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
                    697:        KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1       cgd       698:        sorflush(so);
1.161     ad        699:        refs = so->so_aborting; /* XXX */
1.177     ad        700:        /* Remove acccept filter if one is present. */
1.170     tls       701:        if (so->so_accf != NULL)
1.177     ad        702:                (void)accept_filt_clear(so);
1.160     ad        703:        sounlock(so);
1.161     ad        704:        if (refs == 0)          /* XXX */
                    705:                soput(so);
1.1       cgd       706: }
                    707:
                    708: /*
1.222     rmind     709:  * soclose: close a socket on last file table reference removal.
                    710:  * Initiate disconnect if connected.  Free socket when disconnect complete.
1.1       cgd       711:  */
1.3       andrew    712: int
1.54      lukem     713: soclose(struct socket *so)
1.1       cgd       714: {
1.222     rmind     715:        struct socket *so2;
                    716:        int error = 0;
1.1       cgd       717:
1.160     ad        718:        solock(so);
1.1       cgd       719:        if (so->so_options & SO_ACCEPTCONN) {
1.172     ad        720:                for (;;) {
                    721:                        if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.160     ad        722:                                KASSERT(solocked2(so, so2));
                    723:                                (void) soqremque(so2, 0);
                    724:                                /* soabort drops the lock. */
                    725:                                (void) soabort(so2);
                    726:                                solock(so);
1.172     ad        727:                                continue;
1.160     ad        728:                        }
1.172     ad        729:                        if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.160     ad        730:                                KASSERT(solocked2(so, so2));
                    731:                                (void) soqremque(so2, 1);
                    732:                                /* soabort drops the lock. */
                    733:                                (void) soabort(so2);
                    734:                                solock(so);
1.172     ad        735:                                continue;
1.160     ad        736:                        }
1.172     ad        737:                        break;
                    738:                }
1.1       cgd       739:        }
1.222     rmind     740:        if (so->so_pcb == NULL)
1.1       cgd       741:                goto discard;
                    742:        if (so->so_state & SS_ISCONNECTED) {
                    743:                if ((so->so_state & SS_ISDISCONNECTING) == 0) {
                    744:                        error = sodisconnect(so);
                    745:                        if (error)
                    746:                                goto drop;
                    747:                }
                    748:                if (so->so_options & SO_LINGER) {
1.206     christos  749:                        if ((so->so_state & (SS_ISDISCONNECTING|SS_NBIO)) ==
                    750:                            (SS_ISDISCONNECTING|SS_NBIO))
1.1       cgd       751:                                goto drop;
1.21      christos  752:                        while (so->so_state & SS_ISCONNECTED) {
1.185     yamt      753:                                error = sowait(so, true, so->so_linger * hz);
1.21      christos  754:                                if (error)
1.1       cgd       755:                                        break;
1.21      christos  756:                        }
1.1       cgd       757:                }
                    758:        }
1.54      lukem     759:  drop:
1.1       cgd       760:        if (so->so_pcb) {
1.224     rmind     761:                KASSERT(solocked(so));
                    762:                (*so->so_proto->pr_usrreqs->pr_detach)(so);
1.1       cgd       763:        }
1.54      lukem     764:  discard:
1.222     rmind     765:        KASSERT((so->so_state & SS_NOFDREF) == 0);
1.198     elad      766:        kauth_cred_free(so->so_cred);
1.1       cgd       767:        so->so_state |= SS_NOFDREF;
                    768:        sofree(so);
1.222     rmind     769:        return error;
1.1       cgd       770: }
                    771:
                    772: /*
1.160     ad        773:  * Must be called with the socket locked..  Will return with it unlocked.
1.1       cgd       774:  */
1.3       andrew    775: int
1.54      lukem     776: soabort(struct socket *so)
1.1       cgd       777: {
1.161     ad        778:        u_int refs;
1.139     yamt      779:        int error;
1.160     ad        780:
                    781:        KASSERT(solocked(so));
                    782:        KASSERT(so->so_head == NULL);
1.1       cgd       783:
1.161     ad        784:        so->so_aborting++;              /* XXX */
1.230     mrg       785:        error = (*so->so_proto->pr_usrreqs->pr_abort)(so);
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
1.239   ! rtr       796: soaccept(struct socket *so, struct sockaddr *nam)
1.1       cgd       797: {
1.222     rmind     798:        int error;
1.160     ad        799:
                    800:        KASSERT(solocked(so));
1.222     rmind     801:        KASSERT((so->so_state & SS_NOFDREF) != 0);
1.1       cgd       802:
                    803:        so->so_state &= ~SS_NOFDREF;
1.55      thorpej   804:        if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
                    805:            (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.225     rtr       806:                error = (*so->so_proto->pr_usrreqs->pr_accept)(so, nam);
1.41      mycroft   807:        else
1.53      itojun    808:                error = ECONNABORTED;
1.52      itojun    809:
1.222     rmind     810:        return error;
1.1       cgd       811: }
                    812:
1.3       andrew    813: int
1.114     christos  814: soconnect(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1       cgd       815: {
1.222     rmind     816:        int error;
1.160     ad        817:
                    818:        KASSERT(solocked(so));
1.1       cgd       819:
                    820:        if (so->so_options & SO_ACCEPTCONN)
1.222     rmind     821:                return EOPNOTSUPP;
1.1       cgd       822:        /*
                    823:         * If protocol is connection-based, can only connect once.
                    824:         * Otherwise, if connected, try to disconnect first.
                    825:         * This allows user to disconnect by connecting to, e.g.,
                    826:         * a null address.
                    827:         */
                    828:        if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
                    829:            ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
                    830:            (error = sodisconnect(so))))
                    831:                error = EISCONN;
                    832:        else
1.231     rtr       833:                error = (*so->so_proto->pr_usrreqs->pr_connect)(so, nam, l);
1.222     rmind     834:
                    835:        return error;
1.1       cgd       836: }
                    837:
1.3       andrew    838: int
1.54      lukem     839: soconnect2(struct socket *so1, struct socket *so2)
1.1       cgd       840: {
1.160     ad        841:        KASSERT(solocked2(so1, so2));
1.1       cgd       842:
1.234     rtr       843:        return (*so1->so_proto->pr_usrreqs->pr_connect2)(so1, so2);
1.1       cgd       844: }
                    845:
1.3       andrew    846: int
1.54      lukem     847: sodisconnect(struct socket *so)
1.1       cgd       848: {
1.160     ad        849:        int     error;
                    850:
                    851:        KASSERT(solocked(so));
1.1       cgd       852:
                    853:        if ((so->so_state & SS_ISCONNECTED) == 0) {
                    854:                error = ENOTCONN;
1.160     ad        855:        } else if (so->so_state & SS_ISDISCONNECTING) {
1.1       cgd       856:                error = EALREADY;
1.160     ad        857:        } else {
1.229     rtr       858:                error = (*so->so_proto->pr_usrreqs->pr_disconnect)(so);
1.1       cgd       859:        }
                    860:        return (error);
                    861: }
                    862:
1.15      mycroft   863: #define        SBLOCKWAIT(f)   (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1       cgd       864: /*
                    865:  * Send on a socket.
                    866:  * If send must go all at once and message is larger than
                    867:  * send buffering, then hard error.
                    868:  * Lock against other senders.
                    869:  * If must go all at once and not enough room now, then
                    870:  * inform user that this would block and do nothing.
                    871:  * Otherwise, if nonblocking, send as much as possible.
                    872:  * The data to be sent is described by "uio" if nonzero,
                    873:  * otherwise by the mbuf chain "top" (which must be null
                    874:  * if uio is not).  Data provided in mbuf chain must be small
                    875:  * enough to send all at once.
                    876:  *
                    877:  * Returns nonzero on error, timeout or signal; callers
                    878:  * must check for short counts if EINTR/ERESTART are returned.
                    879:  * Data and control buffers are freed on return.
                    880:  */
1.3       andrew    881: int
1.54      lukem     882: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
1.114     christos  883:        struct mbuf *control, int flags, struct lwp *l)
1.1       cgd       884: {
1.54      lukem     885:        struct mbuf     **mp, *m;
1.58      jdolecek  886:        long            space, len, resid, clen, mlen;
                    887:        int             error, s, dontroute, atomic;
1.196     dsl       888:        short           wakeup_state = 0;
1.54      lukem     889:
1.160     ad        890:        clen = 0;
1.64      thorpej   891:
1.160     ad        892:        /*
                    893:         * solock() provides atomicity of access.  splsoftnet() prevents
                    894:         * protocol processing soft interrupts from interrupting us and
                    895:         * blocking (expensive).
                    896:         */
                    897:        s = splsoftnet();
                    898:        solock(so);
1.54      lukem     899:        atomic = sosendallatonce(so) || top;
1.1       cgd       900:        if (uio)
                    901:                resid = uio->uio_resid;
                    902:        else
                    903:                resid = top->m_pkthdr.len;
1.7       cgd       904:        /*
                    905:         * In theory resid should be unsigned.
                    906:         * However, space must be signed, as it might be less than 0
                    907:         * if we over-committed, and we must use a signed comparison
                    908:         * of space and resid.  On the other hand, a negative resid
                    909:         * causes us to loop sending 0-length segments to the protocol.
                    910:         */
1.29      mycroft   911:        if (resid < 0) {
                    912:                error = EINVAL;
                    913:                goto out;
                    914:        }
1.1       cgd       915:        dontroute =
                    916:            (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
                    917:            (so->so_proto->pr_flags & PR_ATOMIC);
1.165     christos  918:        l->l_ru.ru_msgsnd++;
1.1       cgd       919:        if (control)
                    920:                clen = control->m_len;
1.54      lukem     921:  restart:
1.21      christos  922:        if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1       cgd       923:                goto out;
                    924:        do {
1.160     ad        925:                if (so->so_state & SS_CANTSENDMORE) {
                    926:                        error = EPIPE;
                    927:                        goto release;
                    928:                }
1.48      thorpej   929:                if (so->so_error) {
                    930:                        error = so->so_error;
                    931:                        so->so_error = 0;
                    932:                        goto release;
                    933:                }
1.1       cgd       934:                if ((so->so_state & SS_ISCONNECTED) == 0) {
                    935:                        if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
1.217     rmind     936:                                if (resid || clen == 0) {
1.160     ad        937:                                        error = ENOTCONN;
                    938:                                        goto release;
                    939:                                }
                    940:                        } else if (addr == 0) {
                    941:                                error = EDESTADDRREQ;
                    942:                                goto release;
                    943:                        }
1.1       cgd       944:                }
                    945:                space = sbspace(&so->so_snd);
                    946:                if (flags & MSG_OOB)
                    947:                        space += 1024;
1.21      christos  948:                if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160     ad        949:                    clen > so->so_snd.sb_hiwat) {
                    950:                        error = EMSGSIZE;
                    951:                        goto release;
                    952:                }
1.96      mycroft   953:                if (space < resid + clen &&
1.1       cgd       954:                    (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.206     christos  955:                        if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1.160     ad        956:                                error = EWOULDBLOCK;
                    957:                                goto release;
                    958:                        }
1.1       cgd       959:                        sbunlock(&so->so_snd);
1.196     dsl       960:                        if (wakeup_state & SS_RESTARTSYS) {
                    961:                                error = ERESTART;
                    962:                                goto out;
                    963:                        }
1.1       cgd       964:                        error = sbwait(&so->so_snd);
                    965:                        if (error)
                    966:                                goto out;
1.196     dsl       967:                        wakeup_state = so->so_state;
1.1       cgd       968:                        goto restart;
                    969:                }
1.196     dsl       970:                wakeup_state = 0;
1.1       cgd       971:                mp = &top;
                    972:                space -= clen;
                    973:                do {
1.45      tv        974:                        if (uio == NULL) {
                    975:                                /*
                    976:                                 * Data is prepackaged in "top".
                    977:                                 */
                    978:                                resid = 0;
                    979:                                if (flags & MSG_EOR)
                    980:                                        top->m_flags |= M_EOR;
                    981:                        } else do {
1.160     ad        982:                                sounlock(so);
                    983:                                splx(s);
1.144     dyoung    984:                                if (top == NULL) {
1.78      matt      985:                                        m = m_gethdr(M_WAIT, MT_DATA);
1.45      tv        986:                                        mlen = MHLEN;
                    987:                                        m->m_pkthdr.len = 0;
1.140     dyoung    988:                                        m->m_pkthdr.rcvif = NULL;
1.45      tv        989:                                } else {
1.78      matt      990:                                        m = m_get(M_WAIT, MT_DATA);
1.45      tv        991:                                        mlen = MLEN;
                    992:                                }
1.78      matt      993:                                MCLAIM(m, so->so_snd.sb_mowner);
1.121     yamt      994:                                if (sock_loan_thresh >= 0 &&
                    995:                                    uio->uio_iov->iov_len >= sock_loan_thresh &&
                    996:                                    space >= sock_loan_thresh &&
1.64      thorpej   997:                                    (len = sosend_loan(so, uio, m,
                    998:                                                       space)) != 0) {
                    999:                                        SOSEND_COUNTER_INCR(&sosend_loan_big);
                   1000:                                        space -= len;
                   1001:                                        goto have_data;
                   1002:                                }
1.45      tv       1003:                                if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64      thorpej  1004:                                        SOSEND_COUNTER_INCR(&sosend_copy_big);
1.201     oki      1005:                                        m_clget(m, M_DONTWAIT);
1.45      tv       1006:                                        if ((m->m_flags & M_EXT) == 0)
                   1007:                                                goto nopages;
                   1008:                                        mlen = MCLBYTES;
                   1009:                                        if (atomic && top == 0) {
1.58      jdolecek 1010:                                                len = lmin(MCLBYTES - max_hdr,
1.54      lukem    1011:                                                    resid);
1.45      tv       1012:                                                m->m_data += max_hdr;
                   1013:                                        } else
1.58      jdolecek 1014:                                                len = lmin(MCLBYTES, resid);
1.45      tv       1015:                                        space -= len;
                   1016:                                } else {
1.64      thorpej  1017:  nopages:
                   1018:                                        SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58      jdolecek 1019:                                        len = lmin(lmin(mlen, resid), space);
1.45      tv       1020:                                        space -= len;
                   1021:                                        /*
                   1022:                                         * For datagram protocols, leave room
                   1023:                                         * for protocol headers in first mbuf.
                   1024:                                         */
                   1025:                                        if (atomic && top == 0 && len < mlen)
                   1026:                                                MH_ALIGN(m, len);
                   1027:                                }
1.144     dyoung   1028:                                error = uiomove(mtod(m, void *), (int)len, uio);
1.64      thorpej  1029:  have_data:
1.45      tv       1030:                                resid = uio->uio_resid;
                   1031:                                m->m_len = len;
                   1032:                                *mp = m;
                   1033:                                top->m_pkthdr.len += len;
1.160     ad       1034:                                s = splsoftnet();
                   1035:                                solock(so);
1.144     dyoung   1036:                                if (error != 0)
1.45      tv       1037:                                        goto release;
                   1038:                                mp = &m->m_next;
                   1039:                                if (resid <= 0) {
                   1040:                                        if (flags & MSG_EOR)
                   1041:                                                top->m_flags |= M_EOR;
                   1042:                                        break;
                   1043:                                }
                   1044:                        } while (space > 0 && atomic);
1.108     perry    1045:
1.160     ad       1046:                        if (so->so_state & SS_CANTSENDMORE) {
                   1047:                                error = EPIPE;
                   1048:                                goto release;
                   1049:                        }
1.45      tv       1050:                        if (dontroute)
                   1051:                                so->so_options |= SO_DONTROUTE;
                   1052:                        if (resid > 0)
                   1053:                                so->so_state |= SS_MORETOCOME;
1.226     rtr      1054:                        if (flags & MSG_OOB)
                   1055:                                error = (*so->so_proto->pr_usrreqs->pr_sendoob)(so,
                   1056:                                    top, control);
                   1057:                        else
1.232     rtr      1058:                                error = (*so->so_proto->pr_usrreqs->pr_send)(so,
                   1059:                                    top, addr, control, l);
1.45      tv       1060:                        if (dontroute)
                   1061:                                so->so_options &= ~SO_DONTROUTE;
                   1062:                        if (resid > 0)
                   1063:                                so->so_state &= ~SS_MORETOCOME;
                   1064:                        clen = 0;
1.144     dyoung   1065:                        control = NULL;
                   1066:                        top = NULL;
1.45      tv       1067:                        mp = &top;
1.144     dyoung   1068:                        if (error != 0)
1.1       cgd      1069:                                goto release;
                   1070:                } while (resid && space > 0);
                   1071:        } while (resid);
                   1072:
1.54      lukem    1073:  release:
1.1       cgd      1074:        sbunlock(&so->so_snd);
1.54      lukem    1075:  out:
1.160     ad       1076:        sounlock(so);
                   1077:        splx(s);
1.1       cgd      1078:        if (top)
                   1079:                m_freem(top);
                   1080:        if (control)
                   1081:                m_freem(control);
                   1082:        return (error);
                   1083: }
                   1084:
                   1085: /*
1.159     ad       1086:  * Following replacement or removal of the first mbuf on the first
                   1087:  * mbuf chain of a socket buffer, push necessary state changes back
                   1088:  * into the socket buffer so that other consumers see the values
                   1089:  * consistently.  'nextrecord' is the callers locally stored value of
                   1090:  * the original value of sb->sb_mb->m_nextpkt which must be restored
                   1091:  * when the lead mbuf changes.  NOTE: 'nextrecord' may be NULL.
                   1092:  */
                   1093: static void
                   1094: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
                   1095: {
                   1096:
1.160     ad       1097:        KASSERT(solocked(sb->sb_so));
                   1098:
1.159     ad       1099:        /*
                   1100:         * First, update for the new value of nextrecord.  If necessary,
                   1101:         * make it the first record.
                   1102:         */
                   1103:        if (sb->sb_mb != NULL)
                   1104:                sb->sb_mb->m_nextpkt = nextrecord;
                   1105:        else
                   1106:                sb->sb_mb = nextrecord;
                   1107:
                   1108:         /*
                   1109:          * Now update any dependent socket buffer fields to reflect
                   1110:          * the new state.  This is an inline of SB_EMPTY_FIXUP, with
                   1111:          * the addition of a second clause that takes care of the
                   1112:          * case where sb_mb has been updated, but remains the last
                   1113:          * record.
                   1114:          */
                   1115:         if (sb->sb_mb == NULL) {
                   1116:                 sb->sb_mbtail = NULL;
                   1117:                 sb->sb_lastrecord = NULL;
                   1118:         } else if (sb->sb_mb->m_nextpkt == NULL)
                   1119:                 sb->sb_lastrecord = sb->sb_mb;
                   1120: }
                   1121:
                   1122: /*
1.1       cgd      1123:  * Implement receive operations on a socket.
                   1124:  * We depend on the way that records are added to the sockbuf
                   1125:  * by sbappend*.  In particular, each record (mbufs linked through m_next)
                   1126:  * must begin with an address if the protocol so specifies,
                   1127:  * followed by an optional mbuf or mbufs containing ancillary data,
                   1128:  * and then zero or more mbufs of data.
                   1129:  * In order to avoid blocking network interrupts for the entire time here,
                   1130:  * we splx() while doing the actual copy to user space.
                   1131:  * Although the sockbuf is locked, new data may still be appended,
                   1132:  * and thus we must maintain consistency of the sockbuf during that time.
                   1133:  *
                   1134:  * The caller may receive the data as a single mbuf chain by supplying
                   1135:  * an mbuf **mp0 for use in returning the chain.  The uio is then used
                   1136:  * only for the count in uio_resid.
                   1137:  */
1.3       andrew   1138: int
1.54      lukem    1139: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
                   1140:        struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1       cgd      1141: {
1.116     yamt     1142:        struct lwp *l = curlwp;
1.160     ad       1143:        struct mbuf     *m, **mp, *mt;
1.211     chs      1144:        size_t len, offset, moff, orig_resid;
                   1145:        int atomic, flags, error, s, type;
1.99      matt     1146:        const struct protosw    *pr;
1.54      lukem    1147:        struct mbuf     *nextrecord;
1.67      he       1148:        int             mbuf_removed = 0;
1.146     dyoung   1149:        const struct domain *dom;
1.196     dsl      1150:        short           wakeup_state = 0;
1.64      thorpej  1151:
1.54      lukem    1152:        pr = so->so_proto;
1.146     dyoung   1153:        atomic = pr->pr_flags & PR_ATOMIC;
                   1154:        dom = pr->pr_domain;
1.1       cgd      1155:        mp = mp0;
1.54      lukem    1156:        type = 0;
                   1157:        orig_resid = uio->uio_resid;
1.102     jonathan 1158:
1.144     dyoung   1159:        if (paddr != NULL)
                   1160:                *paddr = NULL;
                   1161:        if (controlp != NULL)
                   1162:                *controlp = NULL;
                   1163:        if (flagsp != NULL)
1.1       cgd      1164:                flags = *flagsp &~ MSG_EOR;
                   1165:        else
                   1166:                flags = 0;
1.66      enami    1167:
1.1       cgd      1168:        if (flags & MSG_OOB) {
                   1169:                m = m_get(M_WAIT, MT_DATA);
1.160     ad       1170:                solock(so);
1.226     rtr      1171:                error = (*pr->pr_usrreqs->pr_recvoob)(so, m, flags & MSG_PEEK);
1.160     ad       1172:                sounlock(so);
1.1       cgd      1173:                if (error)
                   1174:                        goto bad;
                   1175:                do {
1.134     christos 1176:                        error = uiomove(mtod(m, void *),
1.211     chs      1177:                            MIN(uio->uio_resid, m->m_len), uio);
1.1       cgd      1178:                        m = m_free(m);
1.144     dyoung   1179:                } while (uio->uio_resid > 0 && error == 0 && m);
1.54      lukem    1180:  bad:
1.144     dyoung   1181:                if (m != NULL)
1.1       cgd      1182:                        m_freem(m);
1.144     dyoung   1183:                return error;
1.1       cgd      1184:        }
1.144     dyoung   1185:        if (mp != NULL)
1.140     dyoung   1186:                *mp = NULL;
1.160     ad       1187:
                   1188:        /*
                   1189:         * solock() provides atomicity of access.  splsoftnet() prevents
                   1190:         * protocol processing soft interrupts from interrupting us and
                   1191:         * blocking (expensive).
                   1192:         */
                   1193:        s = splsoftnet();
                   1194:        solock(so);
1.54      lukem    1195:  restart:
1.160     ad       1196:        if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
                   1197:                sounlock(so);
                   1198:                splx(s);
1.144     dyoung   1199:                return error;
1.160     ad       1200:        }
1.1       cgd      1201:
                   1202:        m = so->so_rcv.sb_mb;
                   1203:        /*
                   1204:         * If we have less data than requested, block awaiting more
                   1205:         * (subject to any timeout) if:
1.15      mycroft  1206:         *   1. the current count is less than the low water mark,
1.1       cgd      1207:         *   2. MSG_WAITALL is set, and it is possible to do the entire
1.15      mycroft  1208:         *      receive operation at once if we block (resid <= hiwat), or
                   1209:         *   3. MSG_DONTWAIT is not set.
1.1       cgd      1210:         * If MSG_WAITALL is set but resid is larger than the receive buffer,
                   1211:         * we have to do the receive in sections, and thus risk returning
                   1212:         * a short count if a timeout or signal occurs after we start.
                   1213:         */
1.144     dyoung   1214:        if (m == NULL ||
                   1215:            ((flags & MSG_DONTWAIT) == 0 &&
                   1216:             so->so_rcv.sb_cc < uio->uio_resid &&
                   1217:             (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
                   1218:              ((flags & MSG_WAITALL) &&
                   1219:               uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146     dyoung   1220:             m->m_nextpkt == NULL && !atomic)) {
1.1       cgd      1221: #ifdef DIAGNOSTIC
1.144     dyoung   1222:                if (m == NULL && so->so_rcv.sb_cc)
1.1       cgd      1223:                        panic("receive 1");
                   1224: #endif
                   1225:                if (so->so_error) {
1.144     dyoung   1226:                        if (m != NULL)
1.15      mycroft  1227:                                goto dontblock;
1.1       cgd      1228:                        error = so->so_error;
                   1229:                        if ((flags & MSG_PEEK) == 0)
                   1230:                                so->so_error = 0;
                   1231:                        goto release;
                   1232:                }
                   1233:                if (so->so_state & SS_CANTRCVMORE) {
1.144     dyoung   1234:                        if (m != NULL)
1.15      mycroft  1235:                                goto dontblock;
1.1       cgd      1236:                        else
                   1237:                                goto release;
                   1238:                }
1.144     dyoung   1239:                for (; m != NULL; m = m->m_next)
1.1       cgd      1240:                        if (m->m_type == MT_OOBDATA  || (m->m_flags & M_EOR)) {
                   1241:                                m = so->so_rcv.sb_mb;
                   1242:                                goto dontblock;
                   1243:                        }
                   1244:                if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
                   1245:                    (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
                   1246:                        error = ENOTCONN;
                   1247:                        goto release;
                   1248:                }
                   1249:                if (uio->uio_resid == 0)
                   1250:                        goto release;
1.206     christos 1251:                if ((so->so_state & SS_NBIO) ||
                   1252:                    (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1.1       cgd      1253:                        error = EWOULDBLOCK;
                   1254:                        goto release;
                   1255:                }
1.69      thorpej  1256:                SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
                   1257:                SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1       cgd      1258:                sbunlock(&so->so_rcv);
1.196     dsl      1259:                if (wakeup_state & SS_RESTARTSYS)
                   1260:                        error = ERESTART;
                   1261:                else
                   1262:                        error = sbwait(&so->so_rcv);
1.160     ad       1263:                if (error != 0) {
                   1264:                        sounlock(so);
                   1265:                        splx(s);
1.144     dyoung   1266:                        return error;
1.160     ad       1267:                }
1.196     dsl      1268:                wakeup_state = so->so_state;
1.1       cgd      1269:                goto restart;
                   1270:        }
1.54      lukem    1271:  dontblock:
1.69      thorpej  1272:        /*
                   1273:         * On entry here, m points to the first record of the socket buffer.
1.159     ad       1274:         * From this point onward, we maintain 'nextrecord' as a cache of the
                   1275:         * pointer to the next record in the socket buffer.  We must keep the
                   1276:         * various socket buffer pointers and local stack versions of the
                   1277:         * pointers in sync, pushing out modifications before dropping the
1.160     ad       1278:         * socket lock, and re-reading them when picking it up.
1.159     ad       1279:         *
                   1280:         * Otherwise, we will race with the network stack appending new data
                   1281:         * or records onto the socket buffer by using inconsistent/stale
                   1282:         * versions of the field, possibly resulting in socket buffer
                   1283:         * corruption.
                   1284:         *
                   1285:         * By holding the high-level sblock(), we prevent simultaneous
                   1286:         * readers from pulling off the front of the socket buffer.
1.69      thorpej  1287:         */
1.144     dyoung   1288:        if (l != NULL)
1.157     ad       1289:                l->l_ru.ru_msgrcv++;
1.69      thorpej  1290:        KASSERT(m == so->so_rcv.sb_mb);
                   1291:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
                   1292:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1       cgd      1293:        nextrecord = m->m_nextpkt;
                   1294:        if (pr->pr_flags & PR_ADDR) {
                   1295: #ifdef DIAGNOSTIC
                   1296:                if (m->m_type != MT_SONAME)
                   1297:                        panic("receive 1a");
                   1298: #endif
1.3       andrew   1299:                orig_resid = 0;
1.1       cgd      1300:                if (flags & MSG_PEEK) {
                   1301:                        if (paddr)
                   1302:                                *paddr = m_copy(m, 0, m->m_len);
                   1303:                        m = m->m_next;
                   1304:                } else {
                   1305:                        sbfree(&so->so_rcv, m);
1.67      he       1306:                        mbuf_removed = 1;
1.144     dyoung   1307:                        if (paddr != NULL) {
1.1       cgd      1308:                                *paddr = m;
                   1309:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1310:                                m->m_next = NULL;
1.1       cgd      1311:                                m = so->so_rcv.sb_mb;
                   1312:                        } else {
                   1313:                                MFREE(m, so->so_rcv.sb_mb);
                   1314:                                m = so->so_rcv.sb_mb;
                   1315:                        }
1.159     ad       1316:                        sbsync(&so->so_rcv, nextrecord);
1.1       cgd      1317:                }
                   1318:        }
1.159     ad       1319:
                   1320:        /*
                   1321:         * Process one or more MT_CONTROL mbufs present before any data mbufs
                   1322:         * in the first mbuf chain on the socket buffer.  If MSG_PEEK, we
                   1323:         * just copy the data; if !MSG_PEEK, we call into the protocol to
                   1324:         * perform externalization (or freeing if controlp == NULL).
                   1325:         */
                   1326:        if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
                   1327:                struct mbuf *cm = NULL, *cmn;
                   1328:                struct mbuf **cme = &cm;
                   1329:
                   1330:                do {
                   1331:                        if (flags & MSG_PEEK) {
                   1332:                                if (controlp != NULL) {
                   1333:                                        *controlp = m_copy(m, 0, m->m_len);
                   1334:                                        controlp = &(*controlp)->m_next;
                   1335:                                }
                   1336:                                m = m->m_next;
                   1337:                        } else {
                   1338:                                sbfree(&so->so_rcv, m);
1.1       cgd      1339:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1340:                                m->m_next = NULL;
1.159     ad       1341:                                *cme = m;
                   1342:                                cme = &(*cme)->m_next;
1.1       cgd      1343:                                m = so->so_rcv.sb_mb;
1.159     ad       1344:                        }
                   1345:                } while (m != NULL && m->m_type == MT_CONTROL);
                   1346:                if ((flags & MSG_PEEK) == 0)
                   1347:                        sbsync(&so->so_rcv, nextrecord);
                   1348:                for (; cm != NULL; cm = cmn) {
                   1349:                        cmn = cm->m_next;
                   1350:                        cm->m_next = NULL;
                   1351:                        type = mtod(cm, struct cmsghdr *)->cmsg_type;
                   1352:                        if (controlp != NULL) {
                   1353:                                if (dom->dom_externalize != NULL &&
                   1354:                                    type == SCM_RIGHTS) {
1.160     ad       1355:                                        sounlock(so);
1.159     ad       1356:                                        splx(s);
1.204     christos 1357:                                        error = (*dom->dom_externalize)(cm, l,
                   1358:                                            (flags & MSG_CMSG_CLOEXEC) ?
                   1359:                                            O_CLOEXEC : 0);
1.159     ad       1360:                                        s = splsoftnet();
1.160     ad       1361:                                        solock(so);
1.159     ad       1362:                                }
                   1363:                                *controlp = cm;
                   1364:                                while (*controlp != NULL)
                   1365:                                        controlp = &(*controlp)->m_next;
1.1       cgd      1366:                        } else {
1.106     itojun   1367:                                /*
                   1368:                                 * Dispose of any SCM_RIGHTS message that went
                   1369:                                 * through the read path rather than recv.
                   1370:                                 */
1.159     ad       1371:                                if (dom->dom_dispose != NULL &&
                   1372:                                    type == SCM_RIGHTS) {
1.160     ad       1373:                                        sounlock(so);
1.159     ad       1374:                                        (*dom->dom_dispose)(cm);
1.160     ad       1375:                                        solock(so);
1.159     ad       1376:                                }
                   1377:                                m_freem(cm);
1.1       cgd      1378:                        }
                   1379:                }
1.159     ad       1380:                if (m != NULL)
                   1381:                        nextrecord = so->so_rcv.sb_mb->m_nextpkt;
                   1382:                else
                   1383:                        nextrecord = so->so_rcv.sb_mb;
                   1384:                orig_resid = 0;
1.1       cgd      1385:        }
1.69      thorpej  1386:
1.159     ad       1387:        /* If m is non-NULL, we have some data to read. */
                   1388:        if (__predict_true(m != NULL)) {
1.1       cgd      1389:                type = m->m_type;
                   1390:                if (type == MT_OOBDATA)
                   1391:                        flags |= MSG_OOB;
                   1392:        }
1.69      thorpej  1393:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
                   1394:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
                   1395:
1.1       cgd      1396:        moff = 0;
                   1397:        offset = 0;
1.144     dyoung   1398:        while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1       cgd      1399:                if (m->m_type == MT_OOBDATA) {
                   1400:                        if (type != MT_OOBDATA)
                   1401:                                break;
                   1402:                } else if (type == MT_OOBDATA)
                   1403:                        break;
                   1404: #ifdef DIAGNOSTIC
                   1405:                else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
                   1406:                        panic("receive 3");
                   1407: #endif
                   1408:                so->so_state &= ~SS_RCVATMARK;
1.196     dsl      1409:                wakeup_state = 0;
1.1       cgd      1410:                len = uio->uio_resid;
                   1411:                if (so->so_oobmark && len > so->so_oobmark - offset)
                   1412:                        len = so->so_oobmark - offset;
                   1413:                if (len > m->m_len - moff)
                   1414:                        len = m->m_len - moff;
                   1415:                /*
                   1416:                 * If mp is set, just pass back the mbufs.
                   1417:                 * Otherwise copy them out via the uio, then free.
                   1418:                 * Sockbuf must be consistent here (points to current mbuf,
                   1419:                 * it points to next record) when we drop priority;
                   1420:                 * we must note any additions to the sockbuf when we
                   1421:                 * block interrupts again.
                   1422:                 */
1.144     dyoung   1423:                if (mp == NULL) {
1.69      thorpej  1424:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
                   1425:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160     ad       1426:                        sounlock(so);
1.1       cgd      1427:                        splx(s);
1.211     chs      1428:                        error = uiomove(mtod(m, char *) + moff, len, uio);
1.20      mycroft  1429:                        s = splsoftnet();
1.160     ad       1430:                        solock(so);
1.144     dyoung   1431:                        if (error != 0) {
1.67      he       1432:                                /*
                   1433:                                 * If any part of the record has been removed
                   1434:                                 * (such as the MT_SONAME mbuf, which will
                   1435:                                 * happen when PR_ADDR, and thus also
                   1436:                                 * PR_ATOMIC, is set), then drop the entire
                   1437:                                 * record to maintain the atomicity of the
                   1438:                                 * receive operation.
                   1439:                                 *
                   1440:                                 * This avoids a later panic("receive 1a")
                   1441:                                 * when compiled with DIAGNOSTIC.
                   1442:                                 */
1.146     dyoung   1443:                                if (m && mbuf_removed && atomic)
1.67      he       1444:                                        (void) sbdroprecord(&so->so_rcv);
                   1445:
1.57      jdolecek 1446:                                goto release;
1.67      he       1447:                        }
1.1       cgd      1448:                } else
                   1449:                        uio->uio_resid -= len;
                   1450:                if (len == m->m_len - moff) {
                   1451:                        if (m->m_flags & M_EOR)
                   1452:                                flags |= MSG_EOR;
                   1453:                        if (flags & MSG_PEEK) {
                   1454:                                m = m->m_next;
                   1455:                                moff = 0;
                   1456:                        } else {
                   1457:                                nextrecord = m->m_nextpkt;
                   1458:                                sbfree(&so->so_rcv, m);
                   1459:                                if (mp) {
                   1460:                                        *mp = m;
                   1461:                                        mp = &m->m_next;
                   1462:                                        so->so_rcv.sb_mb = m = m->m_next;
1.140     dyoung   1463:                                        *mp = NULL;
1.1       cgd      1464:                                } else {
                   1465:                                        MFREE(m, so->so_rcv.sb_mb);
                   1466:                                        m = so->so_rcv.sb_mb;
                   1467:                                }
1.69      thorpej  1468:                                /*
                   1469:                                 * If m != NULL, we also know that
                   1470:                                 * so->so_rcv.sb_mb != NULL.
                   1471:                                 */
                   1472:                                KASSERT(so->so_rcv.sb_mb == m);
                   1473:                                if (m) {
1.1       cgd      1474:                                        m->m_nextpkt = nextrecord;
1.69      thorpej  1475:                                        if (nextrecord == NULL)
                   1476:                                                so->so_rcv.sb_lastrecord = m;
                   1477:                                } else {
                   1478:                                        so->so_rcv.sb_mb = nextrecord;
1.70      thorpej  1479:                                        SB_EMPTY_FIXUP(&so->so_rcv);
1.69      thorpej  1480:                                }
                   1481:                                SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
                   1482:                                SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1       cgd      1483:                        }
1.144     dyoung   1484:                } else if (flags & MSG_PEEK)
                   1485:                        moff += len;
                   1486:                else {
1.160     ad       1487:                        if (mp != NULL) {
                   1488:                                mt = m_copym(m, 0, len, M_NOWAIT);
                   1489:                                if (__predict_false(mt == NULL)) {
                   1490:                                        sounlock(so);
                   1491:                                        mt = m_copym(m, 0, len, M_WAIT);
                   1492:                                        solock(so);
                   1493:                                }
                   1494:                                *mp = mt;
                   1495:                        }
1.144     dyoung   1496:                        m->m_data += len;
                   1497:                        m->m_len -= len;
                   1498:                        so->so_rcv.sb_cc -= len;
1.1       cgd      1499:                }
                   1500:                if (so->so_oobmark) {
                   1501:                        if ((flags & MSG_PEEK) == 0) {
                   1502:                                so->so_oobmark -= len;
                   1503:                                if (so->so_oobmark == 0) {
                   1504:                                        so->so_state |= SS_RCVATMARK;
                   1505:                                        break;
                   1506:                                }
1.7       cgd      1507:                        } else {
1.1       cgd      1508:                                offset += len;
1.7       cgd      1509:                                if (offset == so->so_oobmark)
                   1510:                                        break;
                   1511:                        }
1.1       cgd      1512:                }
                   1513:                if (flags & MSG_EOR)
                   1514:                        break;
                   1515:                /*
                   1516:                 * If the MSG_WAITALL flag is set (for non-atomic socket),
                   1517:                 * we must not quit until "uio->uio_resid == 0" or an error
                   1518:                 * termination.  If a signal/timeout occurs, return
                   1519:                 * with a short count but without error.
                   1520:                 * Keep sockbuf locked against other readers.
                   1521:                 */
1.144     dyoung   1522:                while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3       andrew   1523:                    !sosendallatonce(so) && !nextrecord) {
1.1       cgd      1524:                        if (so->so_error || so->so_state & SS_CANTRCVMORE)
                   1525:                                break;
1.68      matt     1526:                        /*
                   1527:                         * If we are peeking and the socket receive buffer is
                   1528:                         * full, stop since we can't get more data to peek at.
                   1529:                         */
                   1530:                        if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
                   1531:                                break;
                   1532:                        /*
                   1533:                         * If we've drained the socket buffer, tell the
                   1534:                         * protocol in case it needs to do something to
                   1535:                         * get it filled again.
                   1536:                         */
                   1537:                        if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
1.233     rtr      1538:                                (*pr->pr_usrreqs->pr_rcvd)(so, flags, l);
1.69      thorpej  1539:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
                   1540:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196     dsl      1541:                        if (wakeup_state & SS_RESTARTSYS)
                   1542:                                error = ERESTART;
                   1543:                        else
                   1544:                                error = sbwait(&so->so_rcv);
1.144     dyoung   1545:                        if (error != 0) {
1.1       cgd      1546:                                sbunlock(&so->so_rcv);
1.160     ad       1547:                                sounlock(so);
1.1       cgd      1548:                                splx(s);
1.144     dyoung   1549:                                return 0;
1.1       cgd      1550:                        }
1.21      christos 1551:                        if ((m = so->so_rcv.sb_mb) != NULL)
1.1       cgd      1552:                                nextrecord = m->m_nextpkt;
1.196     dsl      1553:                        wakeup_state = so->so_state;
1.1       cgd      1554:                }
                   1555:        }
1.3       andrew   1556:
1.146     dyoung   1557:        if (m && atomic) {
1.3       andrew   1558:                flags |= MSG_TRUNC;
                   1559:                if ((flags & MSG_PEEK) == 0)
                   1560:                        (void) sbdroprecord(&so->so_rcv);
                   1561:        }
1.1       cgd      1562:        if ((flags & MSG_PEEK) == 0) {
1.144     dyoung   1563:                if (m == NULL) {
1.69      thorpej  1564:                        /*
1.70      thorpej  1565:                         * First part is an inline SB_EMPTY_FIXUP().  Second
1.69      thorpej  1566:                         * part makes sure sb_lastrecord is up-to-date if
                   1567:                         * there is still data in the socket buffer.
                   1568:                         */
1.1       cgd      1569:                        so->so_rcv.sb_mb = nextrecord;
1.69      thorpej  1570:                        if (so->so_rcv.sb_mb == NULL) {
                   1571:                                so->so_rcv.sb_mbtail = NULL;
                   1572:                                so->so_rcv.sb_lastrecord = NULL;
                   1573:                        } else if (nextrecord->m_nextpkt == NULL)
                   1574:                                so->so_rcv.sb_lastrecord = nextrecord;
                   1575:                }
                   1576:                SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
                   1577:                SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1       cgd      1578:                if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.233     rtr      1579:                        (*pr->pr_usrreqs->pr_rcvd)(so, flags, l);
1.1       cgd      1580:        }
1.3       andrew   1581:        if (orig_resid == uio->uio_resid && orig_resid &&
                   1582:            (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
                   1583:                sbunlock(&so->so_rcv);
                   1584:                goto restart;
                   1585:        }
1.108     perry    1586:
1.144     dyoung   1587:        if (flagsp != NULL)
1.1       cgd      1588:                *flagsp |= flags;
1.54      lukem    1589:  release:
1.1       cgd      1590:        sbunlock(&so->so_rcv);
1.160     ad       1591:        sounlock(so);
1.1       cgd      1592:        splx(s);
1.144     dyoung   1593:        return error;
1.1       cgd      1594: }
                   1595:
1.14      mycroft  1596: int
1.54      lukem    1597: soshutdown(struct socket *so, int how)
1.1       cgd      1598: {
1.99      matt     1599:        const struct protosw    *pr;
1.160     ad       1600:        int     error;
                   1601:
                   1602:        KASSERT(solocked(so));
1.34      kleink   1603:
1.54      lukem    1604:        pr = so->so_proto;
1.34      kleink   1605:        if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
                   1606:                return (EINVAL);
1.1       cgd      1607:
1.160     ad       1608:        if (how == SHUT_RD || how == SHUT_RDWR) {
1.1       cgd      1609:                sorflush(so);
1.160     ad       1610:                error = 0;
                   1611:        }
1.34      kleink   1612:        if (how == SHUT_WR || how == SHUT_RDWR)
1.229     rtr      1613:                error = (*pr->pr_usrreqs->pr_shutdown)(so);
1.160     ad       1614:
                   1615:        return error;
1.1       cgd      1616: }
                   1617:
1.195     dsl      1618: void
1.196     dsl      1619: sorestart(struct socket *so)
1.188     ad       1620: {
1.196     dsl      1621:        /*
                   1622:         * An application has called close() on an fd on which another
                   1623:         * of its threads has called a socket system call.
                   1624:         * Mark this and wake everyone up, and code that would block again
                   1625:         * instead returns ERESTART.
                   1626:         * On system call re-entry the fd is validated and EBADF returned.
                   1627:         * Any other fd will block again on the 2nd syscall.
                   1628:         */
1.188     ad       1629:        solock(so);
1.196     dsl      1630:        so->so_state |= SS_RESTARTSYS;
1.188     ad       1631:        cv_broadcast(&so->so_cv);
1.196     dsl      1632:        cv_broadcast(&so->so_snd.sb_cv);
                   1633:        cv_broadcast(&so->so_rcv.sb_cv);
1.188     ad       1634:        sounlock(so);
                   1635: }
                   1636:
1.14      mycroft  1637: void
1.54      lukem    1638: sorflush(struct socket *so)
1.1       cgd      1639: {
1.54      lukem    1640:        struct sockbuf  *sb, asb;
1.99      matt     1641:        const struct protosw    *pr;
1.160     ad       1642:
                   1643:        KASSERT(solocked(so));
1.1       cgd      1644:
1.54      lukem    1645:        sb = &so->so_rcv;
                   1646:        pr = so->so_proto;
1.160     ad       1647:        socantrcvmore(so);
1.1       cgd      1648:        sb->sb_flags |= SB_NOINTR;
1.160     ad       1649:        (void )sblock(sb, M_WAITOK);
1.1       cgd      1650:        sbunlock(sb);
                   1651:        asb = *sb;
1.86      wrstuden 1652:        /*
                   1653:         * Clear most of the sockbuf structure, but leave some of the
                   1654:         * fields valid.
                   1655:         */
                   1656:        memset(&sb->sb_startzero, 0,
                   1657:            sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160     ad       1658:        if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
                   1659:                sounlock(so);
1.1       cgd      1660:                (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160     ad       1661:                solock(so);
                   1662:        }
1.98      christos 1663:        sbrelease(&asb, so);
1.1       cgd      1664: }
                   1665:
1.171     plunky   1666: /*
                   1667:  * internal set SOL_SOCKET options
                   1668:  */
1.142     dyoung   1669: static int
1.171     plunky   1670: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1       cgd      1671: {
1.219     christos 1672:        int error = EINVAL, opt;
                   1673:        int optval = 0; /* XXX: gcc */
1.171     plunky   1674:        struct linger l;
                   1675:        struct timeval tv;
1.142     dyoung   1676:
1.179     christos 1677:        switch ((opt = sopt->sopt_name)) {
1.142     dyoung   1678:
1.170     tls      1679:        case SO_ACCEPTFILTER:
1.177     ad       1680:                error = accept_filt_setopt(so, sopt);
                   1681:                KASSERT(solocked(so));
1.170     tls      1682:                break;
                   1683:
1.171     plunky   1684:        case SO_LINGER:
                   1685:                error = sockopt_get(sopt, &l, sizeof(l));
1.177     ad       1686:                solock(so);
1.171     plunky   1687:                if (error)
1.177     ad       1688:                        break;
1.171     plunky   1689:                if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1.177     ad       1690:                    l.l_linger > (INT_MAX / hz)) {
                   1691:                        error = EDOM;
                   1692:                        break;
                   1693:                }
1.171     plunky   1694:                so->so_linger = l.l_linger;
                   1695:                if (l.l_onoff)
                   1696:                        so->so_options |= SO_LINGER;
                   1697:                else
                   1698:                        so->so_options &= ~SO_LINGER;
1.177     ad       1699:                break;
1.1       cgd      1700:
1.142     dyoung   1701:        case SO_DEBUG:
                   1702:        case SO_KEEPALIVE:
                   1703:        case SO_DONTROUTE:
                   1704:        case SO_USELOOPBACK:
                   1705:        case SO_BROADCAST:
                   1706:        case SO_REUSEADDR:
                   1707:        case SO_REUSEPORT:
                   1708:        case SO_OOBINLINE:
                   1709:        case SO_TIMESTAMP:
1.207     christos 1710:        case SO_NOSIGPIPE:
1.184     christos 1711: #ifdef SO_OTIMESTAMP
                   1712:        case SO_OTIMESTAMP:
                   1713: #endif
1.171     plunky   1714:                error = sockopt_getint(sopt, &optval);
1.177     ad       1715:                solock(so);
1.171     plunky   1716:                if (error)
1.177     ad       1717:                        break;
1.171     plunky   1718:                if (optval)
1.179     christos 1719:                        so->so_options |= opt;
1.142     dyoung   1720:                else
1.179     christos 1721:                        so->so_options &= ~opt;
1.142     dyoung   1722:                break;
                   1723:
                   1724:        case SO_SNDBUF:
                   1725:        case SO_RCVBUF:
                   1726:        case SO_SNDLOWAT:
                   1727:        case SO_RCVLOWAT:
1.171     plunky   1728:                error = sockopt_getint(sopt, &optval);
1.177     ad       1729:                solock(so);
1.171     plunky   1730:                if (error)
1.177     ad       1731:                        break;
1.1       cgd      1732:
1.142     dyoung   1733:                /*
                   1734:                 * Values < 1 make no sense for any of these
                   1735:                 * options, so disallow them.
                   1736:                 */
1.177     ad       1737:                if (optval < 1) {
                   1738:                        error = EINVAL;
                   1739:                        break;
                   1740:                }
1.1       cgd      1741:
1.179     christos 1742:                switch (opt) {
1.171     plunky   1743:                case SO_SNDBUF:
1.177     ad       1744:                        if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
                   1745:                                error = ENOBUFS;
                   1746:                                break;
                   1747:                        }
1.171     plunky   1748:                        so->so_snd.sb_flags &= ~SB_AUTOSIZE;
                   1749:                        break;
1.1       cgd      1750:
                   1751:                case SO_RCVBUF:
1.177     ad       1752:                        if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
                   1753:                                error = ENOBUFS;
                   1754:                                break;
                   1755:                        }
1.171     plunky   1756:                        so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142     dyoung   1757:                        break;
                   1758:
                   1759:                /*
                   1760:                 * Make sure the low-water is never greater than
                   1761:                 * the high-water.
                   1762:                 */
1.1       cgd      1763:                case SO_SNDLOWAT:
1.171     plunky   1764:                        if (optval > so->so_snd.sb_hiwat)
                   1765:                                optval = so->so_snd.sb_hiwat;
                   1766:
                   1767:                        so->so_snd.sb_lowat = optval;
1.142     dyoung   1768:                        break;
1.171     plunky   1769:
1.1       cgd      1770:                case SO_RCVLOWAT:
1.171     plunky   1771:                        if (optval > so->so_rcv.sb_hiwat)
                   1772:                                optval = so->so_rcv.sb_hiwat;
                   1773:
                   1774:                        so->so_rcv.sb_lowat = optval;
1.142     dyoung   1775:                        break;
                   1776:                }
                   1777:                break;
1.28      thorpej  1778:
1.179     christos 1779: #ifdef COMPAT_50
                   1780:        case SO_OSNDTIMEO:
                   1781:        case SO_ORCVTIMEO: {
                   1782:                struct timeval50 otv;
                   1783:                error = sockopt_get(sopt, &otv, sizeof(otv));
1.186     pooka    1784:                if (error) {
                   1785:                        solock(so);
1.183     christos 1786:                        break;
1.186     pooka    1787:                }
1.179     christos 1788:                timeval50_to_timeval(&otv, &tv);
                   1789:                opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182     christos 1790:                error = 0;
1.179     christos 1791:                /*FALLTHROUGH*/
                   1792:        }
                   1793: #endif /* COMPAT_50 */
                   1794:
1.142     dyoung   1795:        case SO_SNDTIMEO:
                   1796:        case SO_RCVTIMEO:
1.182     christos 1797:                if (error)
1.179     christos 1798:                        error = sockopt_get(sopt, &tv, sizeof(tv));
1.177     ad       1799:                solock(so);
1.171     plunky   1800:                if (error)
1.177     ad       1801:                        break;
1.171     plunky   1802:
1.177     ad       1803:                if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
                   1804:                        error = EDOM;
                   1805:                        break;
                   1806:                }
1.28      thorpej  1807:
1.171     plunky   1808:                optval = tv.tv_sec * hz + tv.tv_usec / tick;
                   1809:                if (optval == 0 && tv.tv_usec != 0)
                   1810:                        optval = 1;
1.28      thorpej  1811:
1.179     christos 1812:                switch (opt) {
1.142     dyoung   1813:                case SO_SNDTIMEO:
1.171     plunky   1814:                        so->so_snd.sb_timeo = optval;
1.1       cgd      1815:                        break;
                   1816:                case SO_RCVTIMEO:
1.171     plunky   1817:                        so->so_rcv.sb_timeo = optval;
1.142     dyoung   1818:                        break;
                   1819:                }
                   1820:                break;
1.1       cgd      1821:
1.142     dyoung   1822:        default:
1.177     ad       1823:                solock(so);
                   1824:                error = ENOPROTOOPT;
                   1825:                break;
1.142     dyoung   1826:        }
1.177     ad       1827:        KASSERT(solocked(so));
                   1828:        return error;
1.142     dyoung   1829: }
1.1       cgd      1830:
1.142     dyoung   1831: int
1.171     plunky   1832: sosetopt(struct socket *so, struct sockopt *sopt)
1.142     dyoung   1833: {
                   1834:        int error, prerr;
1.1       cgd      1835:
1.177     ad       1836:        if (sopt->sopt_level == SOL_SOCKET) {
1.171     plunky   1837:                error = sosetopt1(so, sopt);
1.177     ad       1838:                KASSERT(solocked(so));
                   1839:        } else {
1.142     dyoung   1840:                error = ENOPROTOOPT;
1.177     ad       1841:                solock(so);
                   1842:        }
1.1       cgd      1843:
1.142     dyoung   1844:        if ((error == 0 || error == ENOPROTOOPT) &&
                   1845:            so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
                   1846:                /* give the protocol stack a shot */
1.171     plunky   1847:                prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142     dyoung   1848:                if (prerr == 0)
                   1849:                        error = 0;
                   1850:                else if (prerr != ENOPROTOOPT)
                   1851:                        error = prerr;
1.171     plunky   1852:        }
1.160     ad       1853:        sounlock(so);
1.142     dyoung   1854:        return error;
1.1       cgd      1855: }
                   1856:
1.171     plunky   1857: /*
                   1858:  * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
                   1859:  */
                   1860: int
                   1861: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
                   1862:     const void *val, size_t valsize)
                   1863: {
                   1864:        struct sockopt sopt;
                   1865:        int error;
                   1866:
                   1867:        KASSERT(valsize == 0 || val != NULL);
                   1868:
                   1869:        sockopt_init(&sopt, level, name, valsize);
                   1870:        sockopt_set(&sopt, val, valsize);
                   1871:
                   1872:        error = sosetopt(so, &sopt);
                   1873:
                   1874:        sockopt_destroy(&sopt);
                   1875:
                   1876:        return error;
                   1877: }
                   1878:
                   1879: /*
                   1880:  * internal get SOL_SOCKET options
                   1881:  */
                   1882: static int
                   1883: sogetopt1(struct socket *so, struct sockopt *sopt)
                   1884: {
1.179     christos 1885:        int error, optval, opt;
1.171     plunky   1886:        struct linger l;
                   1887:        struct timeval tv;
                   1888:
1.179     christos 1889:        switch ((opt = sopt->sopt_name)) {
1.171     plunky   1890:
                   1891:        case SO_ACCEPTFILTER:
1.177     ad       1892:                error = accept_filt_getopt(so, sopt);
1.171     plunky   1893:                break;
                   1894:
                   1895:        case SO_LINGER:
                   1896:                l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
                   1897:                l.l_linger = so->so_linger;
                   1898:
                   1899:                error = sockopt_set(sopt, &l, sizeof(l));
                   1900:                break;
                   1901:
                   1902:        case SO_USELOOPBACK:
                   1903:        case SO_DONTROUTE:
                   1904:        case SO_DEBUG:
                   1905:        case SO_KEEPALIVE:
                   1906:        case SO_REUSEADDR:
                   1907:        case SO_REUSEPORT:
                   1908:        case SO_BROADCAST:
                   1909:        case SO_OOBINLINE:
                   1910:        case SO_TIMESTAMP:
1.207     christos 1911:        case SO_NOSIGPIPE:
1.184     christos 1912: #ifdef SO_OTIMESTAMP
                   1913:        case SO_OTIMESTAMP:
                   1914: #endif
1.218     seanb    1915:        case SO_ACCEPTCONN:
1.179     christos 1916:                error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171     plunky   1917:                break;
                   1918:
                   1919:        case SO_TYPE:
                   1920:                error = sockopt_setint(sopt, so->so_type);
                   1921:                break;
                   1922:
                   1923:        case SO_ERROR:
                   1924:                error = sockopt_setint(sopt, so->so_error);
                   1925:                so->so_error = 0;
                   1926:                break;
                   1927:
                   1928:        case SO_SNDBUF:
                   1929:                error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
                   1930:                break;
                   1931:
                   1932:        case SO_RCVBUF:
                   1933:                error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
                   1934:                break;
                   1935:
                   1936:        case SO_SNDLOWAT:
                   1937:                error = sockopt_setint(sopt, so->so_snd.sb_lowat);
                   1938:                break;
                   1939:
                   1940:        case SO_RCVLOWAT:
                   1941:                error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
                   1942:                break;
                   1943:
1.179     christos 1944: #ifdef COMPAT_50
                   1945:        case SO_OSNDTIMEO:
                   1946:        case SO_ORCVTIMEO: {
                   1947:                struct timeval50 otv;
                   1948:
                   1949:                optval = (opt == SO_OSNDTIMEO ?
                   1950:                     so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
                   1951:
                   1952:                otv.tv_sec = optval / hz;
                   1953:                otv.tv_usec = (optval % hz) * tick;
                   1954:
                   1955:                error = sockopt_set(sopt, &otv, sizeof(otv));
                   1956:                break;
                   1957:        }
                   1958: #endif /* COMPAT_50 */
                   1959:
1.171     plunky   1960:        case SO_SNDTIMEO:
                   1961:        case SO_RCVTIMEO:
1.179     christos 1962:                optval = (opt == SO_SNDTIMEO ?
1.171     plunky   1963:                     so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
                   1964:
                   1965:                tv.tv_sec = optval / hz;
                   1966:                tv.tv_usec = (optval % hz) * tick;
                   1967:
                   1968:                error = sockopt_set(sopt, &tv, sizeof(tv));
                   1969:                break;
                   1970:
                   1971:        case SO_OVERFLOWED:
                   1972:                error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
                   1973:                break;
                   1974:
                   1975:        default:
                   1976:                error = ENOPROTOOPT;
                   1977:                break;
                   1978:        }
                   1979:
                   1980:        return (error);
                   1981: }
                   1982:
1.14      mycroft  1983: int
1.171     plunky   1984: sogetopt(struct socket *so, struct sockopt *sopt)
1.1       cgd      1985: {
1.160     ad       1986:        int             error;
1.1       cgd      1987:
1.160     ad       1988:        solock(so);
1.171     plunky   1989:        if (sopt->sopt_level != SOL_SOCKET) {
1.1       cgd      1990:                if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160     ad       1991:                        error = ((*so->so_proto->pr_ctloutput)
1.171     plunky   1992:                            (PRCO_GETOPT, so, sopt));
1.1       cgd      1993:                } else
1.160     ad       1994:                        error = (ENOPROTOOPT);
1.1       cgd      1995:        } else {
1.171     plunky   1996:                error = sogetopt1(so, sopt);
                   1997:        }
                   1998:        sounlock(so);
                   1999:        return (error);
                   2000: }
                   2001:
                   2002: /*
                   2003:  * alloc sockopt data buffer buffer
                   2004:  *     - will be released at destroy
                   2005:  */
1.176     plunky   2006: static int
                   2007: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171     plunky   2008: {
                   2009:
                   2010:        KASSERT(sopt->sopt_size == 0);
                   2011:
1.176     plunky   2012:        if (len > sizeof(sopt->sopt_buf)) {
                   2013:                sopt->sopt_data = kmem_zalloc(len, kmflag);
                   2014:                if (sopt->sopt_data == NULL)
                   2015:                        return ENOMEM;
                   2016:        } else
1.171     plunky   2017:                sopt->sopt_data = sopt->sopt_buf;
                   2018:
                   2019:        sopt->sopt_size = len;
1.176     plunky   2020:        return 0;
1.171     plunky   2021: }
                   2022:
                   2023: /*
                   2024:  * initialise sockopt storage
1.176     plunky   2025:  *     - MAY sleep during allocation
1.171     plunky   2026:  */
                   2027: void
                   2028: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
                   2029: {
1.1       cgd      2030:
1.171     plunky   2031:        memset(sopt, 0, sizeof(*sopt));
1.1       cgd      2032:
1.171     plunky   2033:        sopt->sopt_level = level;
                   2034:        sopt->sopt_name = name;
1.176     plunky   2035:        (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171     plunky   2036: }
                   2037:
                   2038: /*
                   2039:  * destroy sockopt storage
                   2040:  *     - will release any held memory references
                   2041:  */
                   2042: void
                   2043: sockopt_destroy(struct sockopt *sopt)
                   2044: {
                   2045:
                   2046:        if (sopt->sopt_data != sopt->sopt_buf)
1.173     plunky   2047:                kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171     plunky   2048:
                   2049:        memset(sopt, 0, sizeof(*sopt));
                   2050: }
                   2051:
                   2052: /*
                   2053:  * set sockopt value
                   2054:  *     - value is copied into sockopt
1.176     plunky   2055:  *     - memory is allocated when necessary, will not sleep
1.171     plunky   2056:  */
                   2057: int
                   2058: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
                   2059: {
1.176     plunky   2060:        int error;
1.171     plunky   2061:
1.176     plunky   2062:        if (sopt->sopt_size == 0) {
                   2063:                error = sockopt_alloc(sopt, len, KM_NOSLEEP);
                   2064:                if (error)
                   2065:                        return error;
                   2066:        }
1.171     plunky   2067:
                   2068:        KASSERT(sopt->sopt_size == len);
                   2069:        memcpy(sopt->sopt_data, buf, len);
                   2070:        return 0;
                   2071: }
                   2072:
                   2073: /*
                   2074:  * common case of set sockopt integer value
                   2075:  */
                   2076: int
                   2077: sockopt_setint(struct sockopt *sopt, int val)
                   2078: {
                   2079:
                   2080:        return sockopt_set(sopt, &val, sizeof(int));
                   2081: }
                   2082:
                   2083: /*
                   2084:  * get sockopt value
                   2085:  *     - correct size must be given
                   2086:  */
                   2087: int
                   2088: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
                   2089: {
1.170     tls      2090:
1.171     plunky   2091:        if (sopt->sopt_size != len)
                   2092:                return EINVAL;
1.1       cgd      2093:
1.171     plunky   2094:        memcpy(buf, sopt->sopt_data, len);
                   2095:        return 0;
                   2096: }
1.1       cgd      2097:
1.171     plunky   2098: /*
                   2099:  * common case of get sockopt integer value
                   2100:  */
                   2101: int
                   2102: sockopt_getint(const struct sockopt *sopt, int *valp)
                   2103: {
1.1       cgd      2104:
1.171     plunky   2105:        return sockopt_get(sopt, valp, sizeof(int));
                   2106: }
1.1       cgd      2107:
1.171     plunky   2108: /*
                   2109:  * set sockopt value from mbuf
                   2110:  *     - ONLY for legacy code
                   2111:  *     - mbuf is released by sockopt
1.176     plunky   2112:  *     - will not sleep
1.171     plunky   2113:  */
                   2114: int
                   2115: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
                   2116: {
                   2117:        size_t len;
1.176     plunky   2118:        int error;
1.1       cgd      2119:
1.171     plunky   2120:        len = m_length(m);
1.1       cgd      2121:
1.176     plunky   2122:        if (sopt->sopt_size == 0) {
                   2123:                error = sockopt_alloc(sopt, len, KM_NOSLEEP);
                   2124:                if (error)
                   2125:                        return error;
                   2126:        }
1.1       cgd      2127:
1.171     plunky   2128:        KASSERT(sopt->sopt_size == len);
                   2129:        m_copydata(m, 0, len, sopt->sopt_data);
                   2130:        m_freem(m);
1.1       cgd      2131:
1.171     plunky   2132:        return 0;
                   2133: }
1.1       cgd      2134:
1.171     plunky   2135: /*
                   2136:  * get sockopt value into mbuf
                   2137:  *     - ONLY for legacy code
                   2138:  *     - mbuf to be released by the caller
1.176     plunky   2139:  *     - will not sleep
1.171     plunky   2140:  */
                   2141: struct mbuf *
                   2142: sockopt_getmbuf(const struct sockopt *sopt)
                   2143: {
                   2144:        struct mbuf *m;
1.107     darrenr  2145:
1.176     plunky   2146:        if (sopt->sopt_size > MCLBYTES)
                   2147:                return NULL;
                   2148:
                   2149:        m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171     plunky   2150:        if (m == NULL)
                   2151:                return NULL;
                   2152:
1.176     plunky   2153:        if (sopt->sopt_size > MLEN) {
                   2154:                MCLGET(m, M_DONTWAIT);
                   2155:                if ((m->m_flags & M_EXT) == 0) {
                   2156:                        m_free(m);
                   2157:                        return NULL;
                   2158:                }
1.1       cgd      2159:        }
1.176     plunky   2160:
                   2161:        memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
                   2162:        m->m_len = sopt->sopt_size;
1.160     ad       2163:
1.171     plunky   2164:        return m;
1.1       cgd      2165: }
                   2166:
1.14      mycroft  2167: void
1.54      lukem    2168: sohasoutofband(struct socket *so)
1.1       cgd      2169: {
1.153     rmind    2170:
1.90      christos 2171:        fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189     ad       2172:        selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1       cgd      2173: }
1.72      jdolecek 2174:
                   2175: static void
                   2176: filt_sordetach(struct knote *kn)
                   2177: {
                   2178:        struct socket   *so;
                   2179:
1.235     matt     2180:        so = ((file_t *)kn->kn_obj)->f_socket;
1.160     ad       2181:        solock(so);
1.73      christos 2182:        SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
                   2183:        if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72      jdolecek 2184:                so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160     ad       2185:        sounlock(so);
1.72      jdolecek 2186: }
                   2187:
                   2188: /*ARGSUSED*/
                   2189: static int
1.129     yamt     2190: filt_soread(struct knote *kn, long hint)
1.72      jdolecek 2191: {
                   2192:        struct socket   *so;
1.160     ad       2193:        int rv;
1.72      jdolecek 2194:
1.235     matt     2195:        so = ((file_t *)kn->kn_obj)->f_socket;
1.160     ad       2196:        if (hint != NOTE_SUBMIT)
                   2197:                solock(so);
1.72      jdolecek 2198:        kn->kn_data = so->so_rcv.sb_cc;
                   2199:        if (so->so_state & SS_CANTRCVMORE) {
1.108     perry    2200:                kn->kn_flags |= EV_EOF;
1.72      jdolecek 2201:                kn->kn_fflags = so->so_error;
1.160     ad       2202:                rv = 1;
                   2203:        } else if (so->so_error)        /* temporary udp error */
                   2204:                rv = 1;
                   2205:        else if (kn->kn_sfflags & NOTE_LOWAT)
                   2206:                rv = (kn->kn_data >= kn->kn_sdata);
                   2207:        else
                   2208:                rv = (kn->kn_data >= so->so_rcv.sb_lowat);
                   2209:        if (hint != NOTE_SUBMIT)
                   2210:                sounlock(so);
                   2211:        return rv;
1.72      jdolecek 2212: }
                   2213:
                   2214: static void
                   2215: filt_sowdetach(struct knote *kn)
                   2216: {
                   2217:        struct socket   *so;
                   2218:
1.235     matt     2219:        so = ((file_t *)kn->kn_obj)->f_socket;
1.160     ad       2220:        solock(so);
1.73      christos 2221:        SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
                   2222:        if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72      jdolecek 2223:                so->so_snd.sb_flags &= ~SB_KNOTE;
1.160     ad       2224:        sounlock(so);
1.72      jdolecek 2225: }
                   2226:
                   2227: /*ARGSUSED*/
                   2228: static int
1.129     yamt     2229: filt_sowrite(struct knote *kn, long hint)
1.72      jdolecek 2230: {
                   2231:        struct socket   *so;
1.160     ad       2232:        int rv;
1.72      jdolecek 2233:
1.235     matt     2234:        so = ((file_t *)kn->kn_obj)->f_socket;
1.160     ad       2235:        if (hint != NOTE_SUBMIT)
                   2236:                solock(so);
1.72      jdolecek 2237:        kn->kn_data = sbspace(&so->so_snd);
                   2238:        if (so->so_state & SS_CANTSENDMORE) {
1.108     perry    2239:                kn->kn_flags |= EV_EOF;
1.72      jdolecek 2240:                kn->kn_fflags = so->so_error;
1.160     ad       2241:                rv = 1;
                   2242:        } else if (so->so_error)        /* temporary udp error */
                   2243:                rv = 1;
                   2244:        else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72      jdolecek 2245:            (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160     ad       2246:                rv = 0;
                   2247:        else if (kn->kn_sfflags & NOTE_LOWAT)
                   2248:                rv = (kn->kn_data >= kn->kn_sdata);
                   2249:        else
                   2250:                rv = (kn->kn_data >= so->so_snd.sb_lowat);
                   2251:        if (hint != NOTE_SUBMIT)
                   2252:                sounlock(so);
                   2253:        return rv;
1.72      jdolecek 2254: }
                   2255:
                   2256: /*ARGSUSED*/
                   2257: static int
1.129     yamt     2258: filt_solisten(struct knote *kn, long hint)
1.72      jdolecek 2259: {
                   2260:        struct socket   *so;
1.160     ad       2261:        int rv;
1.72      jdolecek 2262:
1.235     matt     2263:        so = ((file_t *)kn->kn_obj)->f_socket;
1.72      jdolecek 2264:
                   2265:        /*
                   2266:         * Set kn_data to number of incoming connections, not
                   2267:         * counting partial (incomplete) connections.
1.108     perry    2268:         */
1.160     ad       2269:        if (hint != NOTE_SUBMIT)
                   2270:                solock(so);
1.72      jdolecek 2271:        kn->kn_data = so->so_qlen;
1.160     ad       2272:        rv = (kn->kn_data > 0);
                   2273:        if (hint != NOTE_SUBMIT)
                   2274:                sounlock(so);
                   2275:        return rv;
1.72      jdolecek 2276: }
                   2277:
                   2278: static const struct filterops solisten_filtops =
                   2279:        { 1, NULL, filt_sordetach, filt_solisten };
                   2280: static const struct filterops soread_filtops =
                   2281:        { 1, NULL, filt_sordetach, filt_soread };
                   2282: static const struct filterops sowrite_filtops =
                   2283:        { 1, NULL, filt_sowdetach, filt_sowrite };
                   2284:
                   2285: int
1.129     yamt     2286: soo_kqfilter(struct file *fp, struct knote *kn)
1.72      jdolecek 2287: {
                   2288:        struct socket   *so;
                   2289:        struct sockbuf  *sb;
                   2290:
1.235     matt     2291:        so = ((file_t *)kn->kn_obj)->f_socket;
1.160     ad       2292:        solock(so);
1.72      jdolecek 2293:        switch (kn->kn_filter) {
                   2294:        case EVFILT_READ:
                   2295:                if (so->so_options & SO_ACCEPTCONN)
                   2296:                        kn->kn_fop = &solisten_filtops;
                   2297:                else
                   2298:                        kn->kn_fop = &soread_filtops;
                   2299:                sb = &so->so_rcv;
                   2300:                break;
                   2301:        case EVFILT_WRITE:
                   2302:                kn->kn_fop = &sowrite_filtops;
                   2303:                sb = &so->so_snd;
                   2304:                break;
                   2305:        default:
1.160     ad       2306:                sounlock(so);
1.149     pooka    2307:                return (EINVAL);
1.72      jdolecek 2308:        }
1.73      christos 2309:        SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72      jdolecek 2310:        sb->sb_flags |= SB_KNOTE;
1.160     ad       2311:        sounlock(so);
1.72      jdolecek 2312:        return (0);
                   2313: }
                   2314:
1.154     ad       2315: static int
                   2316: sodopoll(struct socket *so, int events)
                   2317: {
                   2318:        int revents;
                   2319:
                   2320:        revents = 0;
                   2321:
                   2322:        if (events & (POLLIN | POLLRDNORM))
                   2323:                if (soreadable(so))
                   2324:                        revents |= events & (POLLIN | POLLRDNORM);
                   2325:
                   2326:        if (events & (POLLOUT | POLLWRNORM))
                   2327:                if (sowritable(so))
                   2328:                        revents |= events & (POLLOUT | POLLWRNORM);
                   2329:
                   2330:        if (events & (POLLPRI | POLLRDBAND))
                   2331:                if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
                   2332:                        revents |= events & (POLLPRI | POLLRDBAND);
                   2333:
                   2334:        return revents;
                   2335: }
                   2336:
                   2337: int
                   2338: sopoll(struct socket *so, int events)
                   2339: {
                   2340:        int revents = 0;
                   2341:
1.160     ad       2342: #ifndef DIAGNOSTIC
                   2343:        /*
                   2344:         * Do a quick, unlocked check in expectation that the socket
                   2345:         * will be ready for I/O.  Don't do this check if DIAGNOSTIC,
                   2346:         * as the solocked() assertions will fail.
                   2347:         */
1.154     ad       2348:        if ((revents = sodopoll(so, events)) != 0)
                   2349:                return revents;
1.160     ad       2350: #endif
1.154     ad       2351:
1.160     ad       2352:        solock(so);
1.154     ad       2353:        if ((revents = sodopoll(so, events)) == 0) {
                   2354:                if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
                   2355:                        selrecord(curlwp, &so->so_rcv.sb_sel);
1.160     ad       2356:                        so->so_rcv.sb_flags |= SB_NOTIFY;
1.154     ad       2357:                }
                   2358:
                   2359:                if (events & (POLLOUT | POLLWRNORM)) {
                   2360:                        selrecord(curlwp, &so->so_snd.sb_sel);
1.160     ad       2361:                        so->so_snd.sb_flags |= SB_NOTIFY;
1.154     ad       2362:                }
                   2363:        }
1.160     ad       2364:        sounlock(so);
1.154     ad       2365:
                   2366:        return revents;
                   2367: }
                   2368:
                   2369:
1.94      yamt     2370: #include <sys/sysctl.h>
                   2371:
                   2372: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
1.212     pooka    2373: static int sysctl_kern_sbmax(SYSCTLFN_PROTO);
1.94      yamt     2374:
                   2375: /*
                   2376:  * sysctl helper routine for kern.somaxkva.  ensures that the given
                   2377:  * value is not too small.
                   2378:  * (XXX should we maybe make sure it's not too large as well?)
                   2379:  */
                   2380: static int
                   2381: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
                   2382: {
                   2383:        int error, new_somaxkva;
                   2384:        struct sysctlnode node;
                   2385:
                   2386:        new_somaxkva = somaxkva;
                   2387:        node = *rnode;
                   2388:        node.sysctl_data = &new_somaxkva;
                   2389:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2390:        if (error || newp == NULL)
                   2391:                return (error);
                   2392:
                   2393:        if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
                   2394:                return (EINVAL);
                   2395:
1.136     ad       2396:        mutex_enter(&so_pendfree_lock);
1.94      yamt     2397:        somaxkva = new_somaxkva;
1.136     ad       2398:        cv_broadcast(&socurkva_cv);
                   2399:        mutex_exit(&so_pendfree_lock);
1.94      yamt     2400:
                   2401:        return (error);
                   2402: }
                   2403:
1.212     pooka    2404: /*
                   2405:  * sysctl helper routine for kern.sbmax. Basically just ensures that
                   2406:  * any new value is not too small.
                   2407:  */
                   2408: static int
                   2409: sysctl_kern_sbmax(SYSCTLFN_ARGS)
                   2410: {
                   2411:        int error, new_sbmax;
                   2412:        struct sysctlnode node;
                   2413:
                   2414:        new_sbmax = sb_max;
                   2415:        node = *rnode;
                   2416:        node.sysctl_data = &new_sbmax;
                   2417:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2418:        if (error || newp == NULL)
                   2419:                return (error);
                   2420:
                   2421:        KERNEL_LOCK(1, NULL);
                   2422:        error = sb_max_set(new_sbmax);
                   2423:        KERNEL_UNLOCK_ONE(NULL);
                   2424:
                   2425:        return (error);
                   2426: }
                   2427:
1.178     pooka    2428: static void
1.212     pooka    2429: sysctl_kern_socket_setup(void)
1.94      yamt     2430: {
                   2431:
1.178     pooka    2432:        KASSERT(socket_sysctllog == NULL);
1.97      atatat   2433:
1.178     pooka    2434:        sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97      atatat   2435:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103     atatat   2436:                       CTLTYPE_INT, "somaxkva",
                   2437:                       SYSCTL_DESCR("Maximum amount of kernel memory to be "
                   2438:                                    "used for socket buffers"),
1.94      yamt     2439:                       sysctl_kern_somaxkva, 0, NULL, 0,
                   2440:                       CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
1.212     pooka    2441:
                   2442:        sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
                   2443:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   2444:                       CTLTYPE_INT, "sbmax",
                   2445:                       SYSCTL_DESCR("Maximum socket buffer size"),
                   2446:                       sysctl_kern_sbmax, 0, NULL, 0,
                   2447:                       CTL_KERN, KERN_SBMAX, CTL_EOL);
1.94      yamt     2448: }

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