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Annotation of src/sys/kern/uipc_socket.c, Revision 1.199

1.199   ! elad        1: /*     $NetBSD: uipc_socket.c,v 1.198 2009/12/29 04:23:43 elad Exp $   */
1.64      thorpej     2:
                      3: /*-
1.188     ad          4:  * Copyright (c) 2002, 2007, 2008, 2009 The NetBSD Foundation, Inc.
1.64      thorpej     5:  * All rights reserved.
                      6:  *
                      7:  * This code is derived from software contributed to The NetBSD Foundation
1.188     ad          8:  * by Jason R. Thorpe of Wasabi Systems, Inc, and by Andrew Doran.
1.64      thorpej     9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     20:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     21:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     22:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     23:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     24:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     25:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     26:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     27:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     28:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     29:  * POSSIBILITY OF SUCH DAMAGE.
                     30:  */
1.16      cgd        31:
1.1       cgd        32: /*
1.159     ad         33:  * Copyright (c) 2004 The FreeBSD Foundation
                     34:  * Copyright (c) 2004 Robert Watson
1.15      mycroft    35:  * Copyright (c) 1982, 1986, 1988, 1990, 1993
                     36:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        37:  *
                     38:  * Redistribution and use in source and binary forms, with or without
                     39:  * modification, are permitted provided that the following conditions
                     40:  * are met:
                     41:  * 1. Redistributions of source code must retain the above copyright
                     42:  *    notice, this list of conditions and the following disclaimer.
                     43:  * 2. Redistributions in binary form must reproduce the above copyright
                     44:  *    notice, this list of conditions and the following disclaimer in the
                     45:  *    documentation and/or other materials provided with the distribution.
1.85      agc        46:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        47:  *    may be used to endorse or promote products derived from this software
                     48:  *    without specific prior written permission.
                     49:  *
                     50:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     51:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     52:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     53:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     54:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     55:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     56:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     57:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     58:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     59:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     60:  * SUCH DAMAGE.
                     61:  *
1.32      fvdl       62:  *     @(#)uipc_socket.c       8.6 (Berkeley) 5/2/95
1.1       cgd        63:  */
1.59      lukem      64:
                     65: #include <sys/cdefs.h>
1.199   ! elad       66: __KERNEL_RCSID(0, "$NetBSD: uipc_socket.c,v 1.198 2009/12/29 04:23:43 elad Exp $");
1.64      thorpej    67:
1.179     christos   68: #include "opt_compat_netbsd.h"
1.64      thorpej    69: #include "opt_sock_counters.h"
                     70: #include "opt_sosend_loan.h"
1.81      martin     71: #include "opt_mbuftrace.h"
1.84      ragge      72: #include "opt_somaxkva.h"
1.167     ad         73: #include "opt_multiprocessor.h"        /* XXX */
1.1       cgd        74:
1.9       mycroft    75: #include <sys/param.h>
                     76: #include <sys/systm.h>
                     77: #include <sys/proc.h>
                     78: #include <sys/file.h>
1.142     dyoung     79: #include <sys/filedesc.h>
1.173     plunky     80: #include <sys/kmem.h>
1.9       mycroft    81: #include <sys/mbuf.h>
                     82: #include <sys/domain.h>
                     83: #include <sys/kernel.h>
                     84: #include <sys/protosw.h>
                     85: #include <sys/socket.h>
                     86: #include <sys/socketvar.h>
1.21      christos   87: #include <sys/signalvar.h>
1.9       mycroft    88: #include <sys/resourcevar.h>
1.174     pooka      89: #include <sys/uidinfo.h>
1.72      jdolecek   90: #include <sys/event.h>
1.89      christos   91: #include <sys/poll.h>
1.118     elad       92: #include <sys/kauth.h>
1.136     ad         93: #include <sys/mutex.h>
                     94: #include <sys/condvar.h>
1.37      thorpej    95:
1.179     christos   96: #ifdef COMPAT_50
                     97: #include <compat/sys/time.h>
1.184     christos   98: #include <compat/sys/socket.h>
1.179     christos   99: #endif
                    100:
1.64      thorpej   101: #include <uvm/uvm.h>
                    102:
1.77      thorpej   103: MALLOC_DEFINE(M_SOOPTS, "soopts", "socket options");
                    104: MALLOC_DEFINE(M_SONAME, "soname", "socket name");
1.37      thorpej   105:
1.142     dyoung    106: extern const struct fileops socketops;
                    107:
1.54      lukem     108: extern int     somaxconn;                      /* patchable (XXX sysctl) */
                    109: int            somaxconn = SOMAXCONN;
1.160     ad        110: kmutex_t       *softnet_lock;
1.49      jonathan  111:
1.64      thorpej   112: #ifdef SOSEND_COUNTERS
                    113: #include <sys/device.h>
                    114:
1.113     thorpej   115: static struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   116:     NULL, "sosend", "loan big");
1.113     thorpej   117: static struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   118:     NULL, "sosend", "copy big");
1.113     thorpej   119: static struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   120:     NULL, "sosend", "copy small");
1.113     thorpej   121: static struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   122:     NULL, "sosend", "kva limit");
                    123:
                    124: #define        SOSEND_COUNTER_INCR(ev)         (ev)->ev_count++
                    125:
1.101     matt      126: EVCNT_ATTACH_STATIC(sosend_loan_big);
                    127: EVCNT_ATTACH_STATIC(sosend_copy_big);
                    128: EVCNT_ATTACH_STATIC(sosend_copy_small);
                    129: EVCNT_ATTACH_STATIC(sosend_kvalimit);
1.64      thorpej   130: #else
                    131:
                    132: #define        SOSEND_COUNTER_INCR(ev)         /* nothing */
                    133:
                    134: #endif /* SOSEND_COUNTERS */
                    135:
1.119     yamt      136: static struct callback_entry sokva_reclaimerentry;
1.1       cgd       137:
1.167     ad        138: #if defined(SOSEND_NO_LOAN) || defined(MULTIPROCESSOR)
1.121     yamt      139: int sock_loan_thresh = -1;
1.71      thorpej   140: #else
1.121     yamt      141: int sock_loan_thresh = 4096;
1.65      thorpej   142: #endif
1.64      thorpej   143:
1.136     ad        144: static kmutex_t so_pendfree_lock;
1.113     thorpej   145: static struct mbuf *so_pendfree;
1.64      thorpej   146:
1.84      ragge     147: #ifndef SOMAXKVA
                    148: #define        SOMAXKVA (16 * 1024 * 1024)
                    149: #endif
                    150: int somaxkva = SOMAXKVA;
1.113     thorpej   151: static int socurkva;
1.136     ad        152: static kcondvar_t socurkva_cv;
1.64      thorpej   153:
1.191     elad      154: static kauth_listener_t socket_listener;
                    155:
1.64      thorpej   156: #define        SOCK_LOAN_CHUNK         65536
                    157:
1.117     yamt      158: static size_t sodopendfree(void);
                    159: static size_t sodopendfreel(void);
1.93      yamt      160:
1.178     pooka     161: static void sysctl_kern_somaxkva_setup(void);
                    162: static struct sysctllog *socket_sysctllog;
                    163:
1.113     thorpej   164: static vsize_t
1.129     yamt      165: sokvareserve(struct socket *so, vsize_t len)
1.80      yamt      166: {
1.98      christos  167:        int error;
1.80      yamt      168:
1.136     ad        169:        mutex_enter(&so_pendfree_lock);
1.80      yamt      170:        while (socurkva + len > somaxkva) {
1.93      yamt      171:                size_t freed;
                    172:
                    173:                /*
                    174:                 * try to do pendfree.
                    175:                 */
                    176:
1.117     yamt      177:                freed = sodopendfreel();
1.93      yamt      178:
                    179:                /*
                    180:                 * if some kva was freed, try again.
                    181:                 */
                    182:
                    183:                if (freed)
1.80      yamt      184:                        continue;
1.93      yamt      185:
1.80      yamt      186:                SOSEND_COUNTER_INCR(&sosend_kvalimit);
1.136     ad        187:                error = cv_wait_sig(&socurkva_cv, &so_pendfree_lock);
1.98      christos  188:                if (error) {
                    189:                        len = 0;
                    190:                        break;
                    191:                }
1.80      yamt      192:        }
1.93      yamt      193:        socurkva += len;
1.136     ad        194:        mutex_exit(&so_pendfree_lock);
1.98      christos  195:        return len;
1.95      yamt      196: }
                    197:
1.113     thorpej   198: static void
1.95      yamt      199: sokvaunreserve(vsize_t len)
                    200: {
                    201:
1.136     ad        202:        mutex_enter(&so_pendfree_lock);
1.95      yamt      203:        socurkva -= len;
1.136     ad        204:        cv_broadcast(&socurkva_cv);
                    205:        mutex_exit(&so_pendfree_lock);
1.95      yamt      206: }
                    207:
                    208: /*
                    209:  * sokvaalloc: allocate kva for loan.
                    210:  */
                    211:
                    212: vaddr_t
                    213: sokvaalloc(vsize_t len, struct socket *so)
                    214: {
                    215:        vaddr_t lva;
                    216:
                    217:        /*
                    218:         * reserve kva.
                    219:         */
                    220:
1.98      christos  221:        if (sokvareserve(so, len) == 0)
                    222:                return 0;
1.93      yamt      223:
                    224:        /*
                    225:         * allocate kva.
                    226:         */
1.80      yamt      227:
1.109     yamt      228:        lva = uvm_km_alloc(kernel_map, len, 0, UVM_KMF_VAONLY | UVM_KMF_WAITVA);
1.95      yamt      229:        if (lva == 0) {
                    230:                sokvaunreserve(len);
1.80      yamt      231:                return (0);
1.95      yamt      232:        }
1.80      yamt      233:
                    234:        return lva;
                    235: }
                    236:
1.93      yamt      237: /*
                    238:  * sokvafree: free kva for loan.
                    239:  */
                    240:
1.80      yamt      241: void
                    242: sokvafree(vaddr_t sva, vsize_t len)
                    243: {
1.93      yamt      244:
                    245:        /*
                    246:         * free kva.
                    247:         */
1.80      yamt      248:
1.109     yamt      249:        uvm_km_free(kernel_map, sva, len, UVM_KMF_VAONLY);
1.93      yamt      250:
                    251:        /*
                    252:         * unreserve kva.
                    253:         */
                    254:
1.95      yamt      255:        sokvaunreserve(len);
1.80      yamt      256: }
                    257:
1.64      thorpej   258: static void
1.134     christos  259: sodoloanfree(struct vm_page **pgs, void *buf, size_t size)
1.64      thorpej   260: {
1.156     yamt      261:        vaddr_t sva, eva;
1.64      thorpej   262:        vsize_t len;
1.156     yamt      263:        int npgs;
                    264:
                    265:        KASSERT(pgs != NULL);
1.64      thorpej   266:
                    267:        eva = round_page((vaddr_t) buf + size);
                    268:        sva = trunc_page((vaddr_t) buf);
                    269:        len = eva - sva;
                    270:        npgs = len >> PAGE_SHIFT;
                    271:
                    272:        pmap_kremove(sva, len);
                    273:        pmap_update(pmap_kernel());
                    274:        uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE);
1.80      yamt      275:        sokvafree(sva, len);
1.64      thorpej   276: }
                    277:
                    278: static size_t
1.152     matt      279: sodopendfree(void)
1.64      thorpej   280: {
1.93      yamt      281:        size_t rv;
1.64      thorpej   282:
1.160     ad        283:        if (__predict_true(so_pendfree == NULL))
                    284:                return 0;
                    285:
1.136     ad        286:        mutex_enter(&so_pendfree_lock);
1.117     yamt      287:        rv = sodopendfreel();
1.136     ad        288:        mutex_exit(&so_pendfree_lock);
1.93      yamt      289:
                    290:        return rv;
                    291: }
                    292:
                    293: /*
                    294:  * sodopendfreel: free mbufs on "pendfree" list.
1.136     ad        295:  * unlock and relock so_pendfree_lock when freeing mbufs.
1.93      yamt      296:  *
1.136     ad        297:  * => called with so_pendfree_lock held.
1.93      yamt      298:  */
                    299:
                    300: static size_t
1.152     matt      301: sodopendfreel(void)
1.93      yamt      302: {
1.137     ad        303:        struct mbuf *m, *next;
1.93      yamt      304:        size_t rv = 0;
                    305:
1.136     ad        306:        KASSERT(mutex_owned(&so_pendfree_lock));
1.64      thorpej   307:
1.137     ad        308:        while (so_pendfree != NULL) {
1.64      thorpej   309:                m = so_pendfree;
1.93      yamt      310:                so_pendfree = NULL;
1.136     ad        311:                mutex_exit(&so_pendfree_lock);
1.93      yamt      312:
                    313:                for (; m != NULL; m = next) {
                    314:                        next = m->m_next;
1.156     yamt      315:                        KASSERT((~m->m_flags & (M_EXT|M_EXT_PAGES)) == 0);
                    316:                        KASSERT(m->m_ext.ext_refcnt == 0);
1.93      yamt      317:
                    318:                        rv += m->m_ext.ext_size;
1.156     yamt      319:                        sodoloanfree(m->m_ext.ext_pgs, m->m_ext.ext_buf,
1.93      yamt      320:                            m->m_ext.ext_size);
1.145     ad        321:                        pool_cache_put(mb_cache, m);
1.93      yamt      322:                }
1.64      thorpej   323:
1.136     ad        324:                mutex_enter(&so_pendfree_lock);
1.64      thorpej   325:        }
                    326:
                    327:        return (rv);
                    328: }
                    329:
1.80      yamt      330: void
1.134     christos  331: soloanfree(struct mbuf *m, void *buf, size_t size, void *arg)
1.64      thorpej   332: {
                    333:
1.156     yamt      334:        KASSERT(m != NULL);
1.64      thorpej   335:
1.93      yamt      336:        /*
                    337:         * postpone freeing mbuf.
                    338:         *
                    339:         * we can't do it in interrupt context
                    340:         * because we need to put kva back to kernel_map.
                    341:         */
                    342:
1.136     ad        343:        mutex_enter(&so_pendfree_lock);
1.92      yamt      344:        m->m_next = so_pendfree;
                    345:        so_pendfree = m;
1.136     ad        346:        cv_broadcast(&socurkva_cv);
                    347:        mutex_exit(&so_pendfree_lock);
1.64      thorpej   348: }
                    349:
                    350: static long
                    351: sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space)
                    352: {
                    353:        struct iovec *iov = uio->uio_iov;
                    354:        vaddr_t sva, eva;
                    355:        vsize_t len;
1.156     yamt      356:        vaddr_t lva;
                    357:        int npgs, error;
                    358:        vaddr_t va;
                    359:        int i;
1.64      thorpej   360:
1.116     yamt      361:        if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace))
1.64      thorpej   362:                return (0);
                    363:
                    364:        if (iov->iov_len < (size_t) space)
                    365:                space = iov->iov_len;
                    366:        if (space > SOCK_LOAN_CHUNK)
                    367:                space = SOCK_LOAN_CHUNK;
                    368:
                    369:        eva = round_page((vaddr_t) iov->iov_base + space);
                    370:        sva = trunc_page((vaddr_t) iov->iov_base);
                    371:        len = eva - sva;
                    372:        npgs = len >> PAGE_SHIFT;
                    373:
1.79      thorpej   374:        KASSERT(npgs <= M_EXT_MAXPAGES);
                    375:
1.80      yamt      376:        lva = sokvaalloc(len, so);
1.64      thorpej   377:        if (lva == 0)
1.80      yamt      378:                return 0;
1.64      thorpej   379:
1.116     yamt      380:        error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len,
1.79      thorpej   381:            m->m_ext.ext_pgs, UVM_LOAN_TOPAGE);
1.64      thorpej   382:        if (error) {
1.80      yamt      383:                sokvafree(lva, len);
1.64      thorpej   384:                return (0);
                    385:        }
                    386:
                    387:        for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE)
1.79      thorpej   388:                pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]),
1.194     cegger    389:                    VM_PROT_READ, 0);
1.64      thorpej   390:        pmap_update(pmap_kernel());
                    391:
                    392:        lva += (vaddr_t) iov->iov_base & PAGE_MASK;
                    393:
1.134     christos  394:        MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so);
1.79      thorpej   395:        m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP;
1.64      thorpej   396:
                    397:        uio->uio_resid -= space;
                    398:        /* uio_offset not updated, not set/used for write(2) */
1.134     christos  399:        uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space;
1.64      thorpej   400:        uio->uio_iov->iov_len -= space;
                    401:        if (uio->uio_iov->iov_len == 0) {
                    402:                uio->uio_iov++;
                    403:                uio->uio_iovcnt--;
                    404:        }
                    405:
                    406:        return (space);
                    407: }
                    408:
1.119     yamt      409: static int
1.129     yamt      410: sokva_reclaim_callback(struct callback_entry *ce, void *obj, void *arg)
1.119     yamt      411: {
                    412:
                    413:        KASSERT(ce == &sokva_reclaimerentry);
                    414:        KASSERT(obj == NULL);
                    415:
                    416:        sodopendfree();
                    417:        if (!vm_map_starved_p(kernel_map)) {
                    418:                return CALLBACK_CHAIN_ABORT;
                    419:        }
                    420:        return CALLBACK_CHAIN_CONTINUE;
                    421: }
                    422:
1.142     dyoung    423: struct mbuf *
1.147     dyoung    424: getsombuf(struct socket *so, int type)
1.142     dyoung    425: {
                    426:        struct mbuf *m;
                    427:
1.147     dyoung    428:        m = m_get(M_WAIT, type);
1.142     dyoung    429:        MCLAIM(m, so->so_mowner);
                    430:        return m;
                    431: }
                    432:
1.191     elad      433: static int
                    434: socket_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
                    435:     void *arg0, void *arg1, void *arg2, void *arg3)
                    436: {
                    437:        int result;
                    438:        enum kauth_network_req req;
                    439:
                    440:        result = KAUTH_RESULT_DEFER;
                    441:        req = (enum kauth_network_req)arg0;
                    442:
1.193     elad      443:        if ((action != KAUTH_NETWORK_SOCKET) &&
                    444:            (action != KAUTH_NETWORK_BIND))
1.191     elad      445:                return result;
                    446:
                    447:        switch (req) {
1.193     elad      448:        case KAUTH_REQ_NETWORK_BIND_PORT:
                    449:                result = KAUTH_RESULT_ALLOW;
                    450:                break;
                    451:
1.191     elad      452:        case KAUTH_REQ_NETWORK_SOCKET_DROP: {
                    453:                /* Normal users can only drop their own connections. */
                    454:                struct socket *so = (struct socket *)arg1;
                    455:
1.199   ! elad      456:                if (proc_uidmatch(cred, so->so_cred))
1.191     elad      457:                        result = KAUTH_RESULT_ALLOW;
                    458:
                    459:                break;
                    460:                }
                    461:
                    462:        case KAUTH_REQ_NETWORK_SOCKET_OPEN:
                    463:                /* We allow "raw" routing/bluetooth sockets to anyone. */
                    464:                if ((u_long)arg1 == PF_ROUTE || (u_long)arg1 == PF_BLUETOOTH)
                    465:                        result = KAUTH_RESULT_ALLOW;
                    466:                else {
                    467:                        /* Privileged, let secmodel handle this. */
                    468:                        if ((u_long)arg2 == SOCK_RAW)
                    469:                                break;
                    470:                }
                    471:
                    472:                result = KAUTH_RESULT_ALLOW;
                    473:
                    474:                break;
                    475:
1.192     elad      476:        case KAUTH_REQ_NETWORK_SOCKET_CANSEE:
                    477:                result = KAUTH_RESULT_ALLOW;
                    478:
                    479:                break;
                    480:
1.191     elad      481:        default:
                    482:                break;
                    483:        }
                    484:
                    485:        return result;
                    486: }
                    487:
1.119     yamt      488: void
                    489: soinit(void)
                    490: {
                    491:
1.178     pooka     492:        sysctl_kern_somaxkva_setup();
                    493:
1.148     ad        494:        mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM);
1.160     ad        495:        softnet_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
1.136     ad        496:        cv_init(&socurkva_cv, "sokva");
1.166     ad        497:        soinit2();
1.136     ad        498:
1.119     yamt      499:        /* Set the initial adjusted socket buffer size. */
                    500:        if (sb_max_set(sb_max))
                    501:                panic("bad initial sb_max value: %lu", sb_max);
                    502:
                    503:        callback_register(&vm_map_to_kernel(kernel_map)->vmk_reclaim_callback,
                    504:            &sokva_reclaimerentry, NULL, sokva_reclaim_callback);
1.191     elad      505:
                    506:        socket_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
                    507:            socket_listener_cb, NULL);
1.119     yamt      508: }
                    509:
1.1       cgd       510: /*
                    511:  * Socket operation routines.
                    512:  * These routines are called by the routines in
                    513:  * sys_socket.c or from a system process, and
                    514:  * implement the semantics of socket operations by
                    515:  * switching out to the protocol specific routines.
                    516:  */
                    517: /*ARGSUSED*/
1.3       andrew    518: int
1.160     ad        519: socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l,
                    520:         struct socket *lockso)
1.1       cgd       521: {
1.99      matt      522:        const struct protosw    *prp;
1.54      lukem     523:        struct socket   *so;
1.115     yamt      524:        uid_t           uid;
1.160     ad        525:        int             error;
                    526:        kmutex_t        *lock;
1.1       cgd       527:
1.132     elad      528:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET,
                    529:            KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type),
                    530:            KAUTH_ARG(proto));
1.140     dyoung    531:        if (error != 0)
                    532:                return error;
1.127     elad      533:
1.1       cgd       534:        if (proto)
                    535:                prp = pffindproto(dom, proto, type);
                    536:        else
                    537:                prp = pffindtype(dom, type);
1.140     dyoung    538:        if (prp == NULL) {
1.120     ginsbach  539:                /* no support for domain */
                    540:                if (pffinddomain(dom) == 0)
1.140     dyoung    541:                        return EAFNOSUPPORT;
1.120     ginsbach  542:                /* no support for socket type */
                    543:                if (proto == 0 && type != 0)
1.140     dyoung    544:                        return EPROTOTYPE;
                    545:                return EPROTONOSUPPORT;
1.120     ginsbach  546:        }
1.140     dyoung    547:        if (prp->pr_usrreq == NULL)
                    548:                return EPROTONOSUPPORT;
1.1       cgd       549:        if (prp->pr_type != type)
1.140     dyoung    550:                return EPROTOTYPE;
1.160     ad        551:
                    552:        so = soget(true);
1.1       cgd       553:        so->so_type = type;
                    554:        so->so_proto = prp;
1.33      matt      555:        so->so_send = sosend;
                    556:        so->so_receive = soreceive;
1.78      matt      557: #ifdef MBUFTRACE
                    558:        so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner;
                    559:        so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner;
                    560:        so->so_mowner = &prp->pr_domain->dom_mowner;
                    561: #endif
1.138     rmind     562:        uid = kauth_cred_geteuid(l->l_cred);
1.115     yamt      563:        so->so_uidinfo = uid_find(uid);
1.168     yamt      564:        so->so_egid = kauth_cred_getegid(l->l_cred);
                    565:        so->so_cpid = l->l_proc->p_pid;
1.160     ad        566:        if (lockso != NULL) {
                    567:                /* Caller wants us to share a lock. */
                    568:                lock = lockso->so_lock;
                    569:                so->so_lock = lock;
                    570:                mutex_obj_hold(lock);
                    571:                mutex_enter(lock);
                    572:        } else {
                    573:                /* Lock assigned and taken during PRU_ATTACH. */
                    574:        }
1.140     dyoung    575:        error = (*prp->pr_usrreq)(so, PRU_ATTACH, NULL,
                    576:            (struct mbuf *)(long)proto, NULL, l);
1.160     ad        577:        KASSERT(solocked(so));
1.140     dyoung    578:        if (error != 0) {
1.1       cgd       579:                so->so_state |= SS_NOFDREF;
                    580:                sofree(so);
1.140     dyoung    581:                return error;
1.1       cgd       582:        }
1.198     elad      583:        so->so_cred = kauth_cred_dup(l->l_cred);
1.160     ad        584:        sounlock(so);
1.1       cgd       585:        *aso = so;
1.140     dyoung    586:        return 0;
1.1       cgd       587: }
                    588:
1.142     dyoung    589: /* On success, write file descriptor to fdout and return zero.  On
                    590:  * failure, return non-zero; *fdout will be undefined.
                    591:  */
                    592: int
                    593: fsocreate(int domain, struct socket **sop, int type, int protocol,
                    594:     struct lwp *l, int *fdout)
                    595: {
                    596:        struct socket   *so;
                    597:        struct file     *fp;
                    598:        int             fd, error;
                    599:
1.155     ad        600:        if ((error = fd_allocfile(&fp, &fd)) != 0)
1.142     dyoung    601:                return (error);
                    602:        fp->f_flag = FREAD|FWRITE;
                    603:        fp->f_type = DTYPE_SOCKET;
                    604:        fp->f_ops = &socketops;
1.160     ad        605:        error = socreate(domain, &so, type, protocol, l, NULL);
1.142     dyoung    606:        if (error != 0) {
1.155     ad        607:                fd_abort(curproc, fp, fd);
1.142     dyoung    608:        } else {
                    609:                if (sop != NULL)
                    610:                        *sop = so;
                    611:                fp->f_data = so;
1.155     ad        612:                fd_affix(curproc, fp, fd);
1.142     dyoung    613:                *fdout = fd;
                    614:        }
                    615:        return error;
                    616: }
                    617:
1.3       andrew    618: int
1.190     dyoung    619: sofamily(const struct socket *so)
                    620: {
                    621:        const struct protosw *pr;
                    622:        const struct domain *dom;
                    623:
                    624:        if ((pr = so->so_proto) == NULL)
                    625:                return AF_UNSPEC;
                    626:        if ((dom = pr->pr_domain) == NULL)
                    627:                return AF_UNSPEC;
                    628:        return dom->dom_family;
                    629: }
                    630:
                    631: int
1.114     christos  632: sobind(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1       cgd       633: {
1.160     ad        634:        int     error;
1.1       cgd       635:
1.160     ad        636:        solock(so);
1.140     dyoung    637:        error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, NULL, nam, NULL, l);
1.160     ad        638:        sounlock(so);
1.140     dyoung    639:        return error;
1.1       cgd       640: }
                    641:
1.3       andrew    642: int
1.150     elad      643: solisten(struct socket *so, int backlog, struct lwp *l)
1.1       cgd       644: {
1.160     ad        645:        int     error;
1.1       cgd       646:
1.160     ad        647:        solock(so);
1.158     ad        648:        if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163     ad        649:            SS_ISDISCONNECTING)) != 0) {
                    650:                sounlock(so);
1.158     ad        651:                return (EOPNOTSUPP);
1.163     ad        652:        }
1.140     dyoung    653:        error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, NULL,
1.150     elad      654:            NULL, NULL, l);
1.140     dyoung    655:        if (error != 0) {
1.160     ad        656:                sounlock(so);
1.140     dyoung    657:                return error;
1.1       cgd       658:        }
1.63      matt      659:        if (TAILQ_EMPTY(&so->so_q))
1.1       cgd       660:                so->so_options |= SO_ACCEPTCONN;
                    661:        if (backlog < 0)
                    662:                backlog = 0;
1.49      jonathan  663:        so->so_qlimit = min(backlog, somaxconn);
1.160     ad        664:        sounlock(so);
1.140     dyoung    665:        return 0;
1.1       cgd       666: }
                    667:
1.21      christos  668: void
1.54      lukem     669: sofree(struct socket *so)
1.1       cgd       670: {
1.161     ad        671:        u_int refs;
1.1       cgd       672:
1.160     ad        673:        KASSERT(solocked(so));
                    674:
                    675:        if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
                    676:                sounlock(so);
1.1       cgd       677:                return;
1.160     ad        678:        }
1.43      mycroft   679:        if (so->so_head) {
                    680:                /*
                    681:                 * We must not decommission a socket that's on the accept(2)
                    682:                 * queue.  If we do, then accept(2) may hang after select(2)
                    683:                 * indicated that the listening socket was ready.
                    684:                 */
1.160     ad        685:                if (!soqremque(so, 0)) {
                    686:                        sounlock(so);
1.43      mycroft   687:                        return;
1.160     ad        688:                }
1.43      mycroft   689:        }
1.98      christos  690:        if (so->so_rcv.sb_hiwat)
1.110     christos  691:                (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98      christos  692:                    RLIM_INFINITY);
                    693:        if (so->so_snd.sb_hiwat)
1.110     christos  694:                (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98      christos  695:                    RLIM_INFINITY);
                    696:        sbrelease(&so->so_snd, so);
1.160     ad        697:        KASSERT(!cv_has_waiters(&so->so_cv));
                    698:        KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
                    699:        KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1       cgd       700:        sorflush(so);
1.161     ad        701:        refs = so->so_aborting; /* XXX */
1.177     ad        702:        /* Remove acccept filter if one is present. */
1.170     tls       703:        if (so->so_accf != NULL)
1.177     ad        704:                (void)accept_filt_clear(so);
1.160     ad        705:        sounlock(so);
1.161     ad        706:        if (refs == 0)          /* XXX */
                    707:                soput(so);
1.1       cgd       708: }
                    709:
                    710: /*
                    711:  * Close a socket on last file table reference removal.
                    712:  * Initiate disconnect if connected.
                    713:  * Free socket when disconnect complete.
                    714:  */
1.3       andrew    715: int
1.54      lukem     716: soclose(struct socket *so)
1.1       cgd       717: {
1.54      lukem     718:        struct socket   *so2;
1.160     ad        719:        int             error;
                    720:        int             error2;
1.1       cgd       721:
1.54      lukem     722:        error = 0;
1.160     ad        723:        solock(so);
1.1       cgd       724:        if (so->so_options & SO_ACCEPTCONN) {
1.172     ad        725:                for (;;) {
                    726:                        if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.160     ad        727:                                KASSERT(solocked2(so, so2));
                    728:                                (void) soqremque(so2, 0);
                    729:                                /* soabort drops the lock. */
                    730:                                (void) soabort(so2);
                    731:                                solock(so);
1.172     ad        732:                                continue;
1.160     ad        733:                        }
1.172     ad        734:                        if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.160     ad        735:                                KASSERT(solocked2(so, so2));
                    736:                                (void) soqremque(so2, 1);
                    737:                                /* soabort drops the lock. */
                    738:                                (void) soabort(so2);
                    739:                                solock(so);
1.172     ad        740:                                continue;
1.160     ad        741:                        }
1.172     ad        742:                        break;
                    743:                }
1.1       cgd       744:        }
                    745:        if (so->so_pcb == 0)
                    746:                goto discard;
                    747:        if (so->so_state & SS_ISCONNECTED) {
                    748:                if ((so->so_state & SS_ISDISCONNECTING) == 0) {
                    749:                        error = sodisconnect(so);
                    750:                        if (error)
                    751:                                goto drop;
                    752:                }
                    753:                if (so->so_options & SO_LINGER) {
1.151     ad        754:                        if ((so->so_state & SS_ISDISCONNECTING) && so->so_nbio)
1.1       cgd       755:                                goto drop;
1.21      christos  756:                        while (so->so_state & SS_ISCONNECTED) {
1.185     yamt      757:                                error = sowait(so, true, so->so_linger * hz);
1.21      christos  758:                                if (error)
1.1       cgd       759:                                        break;
1.21      christos  760:                        }
1.1       cgd       761:                }
                    762:        }
1.54      lukem     763:  drop:
1.1       cgd       764:        if (so->so_pcb) {
1.160     ad        765:                error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH,
1.140     dyoung    766:                    NULL, NULL, NULL, NULL);
1.1       cgd       767:                if (error == 0)
                    768:                        error = error2;
                    769:        }
1.54      lukem     770:  discard:
1.1       cgd       771:        if (so->so_state & SS_NOFDREF)
                    772:                panic("soclose: NOFDREF");
1.198     elad      773:        kauth_cred_free(so->so_cred);
1.1       cgd       774:        so->so_state |= SS_NOFDREF;
                    775:        sofree(so);
                    776:        return (error);
                    777: }
                    778:
                    779: /*
1.160     ad        780:  * Must be called with the socket locked..  Will return with it unlocked.
1.1       cgd       781:  */
1.3       andrew    782: int
1.54      lukem     783: soabort(struct socket *so)
1.1       cgd       784: {
1.161     ad        785:        u_int refs;
1.139     yamt      786:        int error;
1.160     ad        787:
                    788:        KASSERT(solocked(so));
                    789:        KASSERT(so->so_head == NULL);
1.1       cgd       790:
1.161     ad        791:        so->so_aborting++;              /* XXX */
1.140     dyoung    792:        error = (*so->so_proto->pr_usrreq)(so, PRU_ABORT, NULL,
                    793:            NULL, NULL, NULL);
1.161     ad        794:        refs = --so->so_aborting;       /* XXX */
1.164     drochner  795:        if (error || (refs == 0)) {
1.139     yamt      796:                sofree(so);
1.160     ad        797:        } else {
                    798:                sounlock(so);
1.139     yamt      799:        }
                    800:        return error;
1.1       cgd       801: }
                    802:
1.3       andrew    803: int
1.54      lukem     804: soaccept(struct socket *so, struct mbuf *nam)
1.1       cgd       805: {
1.160     ad        806:        int     error;
                    807:
                    808:        KASSERT(solocked(so));
1.1       cgd       809:
1.54      lukem     810:        error = 0;
1.1       cgd       811:        if ((so->so_state & SS_NOFDREF) == 0)
                    812:                panic("soaccept: !NOFDREF");
                    813:        so->so_state &= ~SS_NOFDREF;
1.55      thorpej   814:        if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
                    815:            (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.41      mycroft   816:                error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT,
1.140     dyoung    817:                    NULL, nam, NULL, NULL);
1.41      mycroft   818:        else
1.53      itojun    819:                error = ECONNABORTED;
1.52      itojun    820:
1.1       cgd       821:        return (error);
                    822: }
                    823:
1.3       andrew    824: int
1.114     christos  825: soconnect(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1       cgd       826: {
1.160     ad        827:        int             error;
                    828:
                    829:        KASSERT(solocked(so));
1.1       cgd       830:
                    831:        if (so->so_options & SO_ACCEPTCONN)
                    832:                return (EOPNOTSUPP);
                    833:        /*
                    834:         * If protocol is connection-based, can only connect once.
                    835:         * Otherwise, if connected, try to disconnect first.
                    836:         * This allows user to disconnect by connecting to, e.g.,
                    837:         * a null address.
                    838:         */
                    839:        if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
                    840:            ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
                    841:            (error = sodisconnect(so))))
                    842:                error = EISCONN;
                    843:        else
                    844:                error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT,
1.140     dyoung    845:                    NULL, nam, NULL, l);
1.1       cgd       846:        return (error);
                    847: }
                    848:
1.3       andrew    849: int
1.54      lukem     850: soconnect2(struct socket *so1, struct socket *so2)
1.1       cgd       851: {
1.160     ad        852:        int     error;
                    853:
                    854:        KASSERT(solocked2(so1, so2));
1.1       cgd       855:
1.22      mycroft   856:        error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2,
1.140     dyoung    857:            NULL, (struct mbuf *)so2, NULL, NULL);
1.1       cgd       858:        return (error);
                    859: }
                    860:
1.3       andrew    861: int
1.54      lukem     862: sodisconnect(struct socket *so)
1.1       cgd       863: {
1.160     ad        864:        int     error;
                    865:
                    866:        KASSERT(solocked(so));
1.1       cgd       867:
                    868:        if ((so->so_state & SS_ISCONNECTED) == 0) {
                    869:                error = ENOTCONN;
1.160     ad        870:        } else if (so->so_state & SS_ISDISCONNECTING) {
1.1       cgd       871:                error = EALREADY;
1.160     ad        872:        } else {
                    873:                error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT,
                    874:                    NULL, NULL, NULL, NULL);
1.1       cgd       875:        }
1.117     yamt      876:        sodopendfree();
1.1       cgd       877:        return (error);
                    878: }
                    879:
1.15      mycroft   880: #define        SBLOCKWAIT(f)   (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1       cgd       881: /*
                    882:  * Send on a socket.
                    883:  * If send must go all at once and message is larger than
                    884:  * send buffering, then hard error.
                    885:  * Lock against other senders.
                    886:  * If must go all at once and not enough room now, then
                    887:  * inform user that this would block and do nothing.
                    888:  * Otherwise, if nonblocking, send as much as possible.
                    889:  * The data to be sent is described by "uio" if nonzero,
                    890:  * otherwise by the mbuf chain "top" (which must be null
                    891:  * if uio is not).  Data provided in mbuf chain must be small
                    892:  * enough to send all at once.
                    893:  *
                    894:  * Returns nonzero on error, timeout or signal; callers
                    895:  * must check for short counts if EINTR/ERESTART are returned.
                    896:  * Data and control buffers are freed on return.
                    897:  */
1.3       andrew    898: int
1.54      lukem     899: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
1.114     christos  900:        struct mbuf *control, int flags, struct lwp *l)
1.1       cgd       901: {
1.54      lukem     902:        struct mbuf     **mp, *m;
1.114     christos  903:        struct proc     *p;
1.58      jdolecek  904:        long            space, len, resid, clen, mlen;
                    905:        int             error, s, dontroute, atomic;
1.196     dsl       906:        short           wakeup_state = 0;
1.54      lukem     907:
1.114     christos  908:        p = l->l_proc;
1.117     yamt      909:        sodopendfree();
1.160     ad        910:        clen = 0;
1.64      thorpej   911:
1.160     ad        912:        /*
                    913:         * solock() provides atomicity of access.  splsoftnet() prevents
                    914:         * protocol processing soft interrupts from interrupting us and
                    915:         * blocking (expensive).
                    916:         */
                    917:        s = splsoftnet();
                    918:        solock(so);
1.54      lukem     919:        atomic = sosendallatonce(so) || top;
1.1       cgd       920:        if (uio)
                    921:                resid = uio->uio_resid;
                    922:        else
                    923:                resid = top->m_pkthdr.len;
1.7       cgd       924:        /*
                    925:         * In theory resid should be unsigned.
                    926:         * However, space must be signed, as it might be less than 0
                    927:         * if we over-committed, and we must use a signed comparison
                    928:         * of space and resid.  On the other hand, a negative resid
                    929:         * causes us to loop sending 0-length segments to the protocol.
                    930:         */
1.29      mycroft   931:        if (resid < 0) {
                    932:                error = EINVAL;
                    933:                goto out;
                    934:        }
1.1       cgd       935:        dontroute =
                    936:            (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
                    937:            (so->so_proto->pr_flags & PR_ATOMIC);
1.165     christos  938:        l->l_ru.ru_msgsnd++;
1.1       cgd       939:        if (control)
                    940:                clen = control->m_len;
1.54      lukem     941:  restart:
1.21      christos  942:        if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1       cgd       943:                goto out;
                    944:        do {
1.160     ad        945:                if (so->so_state & SS_CANTSENDMORE) {
                    946:                        error = EPIPE;
                    947:                        goto release;
                    948:                }
1.48      thorpej   949:                if (so->so_error) {
                    950:                        error = so->so_error;
                    951:                        so->so_error = 0;
                    952:                        goto release;
                    953:                }
1.1       cgd       954:                if ((so->so_state & SS_ISCONNECTED) == 0) {
                    955:                        if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
                    956:                                if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1.160     ad        957:                                    !(resid == 0 && clen != 0)) {
                    958:                                        error = ENOTCONN;
                    959:                                        goto release;
                    960:                                }
                    961:                        } else if (addr == 0) {
                    962:                                error = EDESTADDRREQ;
                    963:                                goto release;
                    964:                        }
1.1       cgd       965:                }
                    966:                space = sbspace(&so->so_snd);
                    967:                if (flags & MSG_OOB)
                    968:                        space += 1024;
1.21      christos  969:                if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160     ad        970:                    clen > so->so_snd.sb_hiwat) {
                    971:                        error = EMSGSIZE;
                    972:                        goto release;
                    973:                }
1.96      mycroft   974:                if (space < resid + clen &&
1.1       cgd       975:                    (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.160     ad        976:                        if (so->so_nbio) {
                    977:                                error = EWOULDBLOCK;
                    978:                                goto release;
                    979:                        }
1.1       cgd       980:                        sbunlock(&so->so_snd);
1.196     dsl       981:                        if (wakeup_state & SS_RESTARTSYS) {
                    982:                                error = ERESTART;
                    983:                                goto out;
                    984:                        }
1.1       cgd       985:                        error = sbwait(&so->so_snd);
                    986:                        if (error)
                    987:                                goto out;
1.196     dsl       988:                        wakeup_state = so->so_state;
1.1       cgd       989:                        goto restart;
                    990:                }
1.196     dsl       991:                wakeup_state = 0;
1.1       cgd       992:                mp = &top;
                    993:                space -= clen;
                    994:                do {
1.45      tv        995:                        if (uio == NULL) {
                    996:                                /*
                    997:                                 * Data is prepackaged in "top".
                    998:                                 */
                    999:                                resid = 0;
                   1000:                                if (flags & MSG_EOR)
                   1001:                                        top->m_flags |= M_EOR;
                   1002:                        } else do {
1.160     ad       1003:                                sounlock(so);
                   1004:                                splx(s);
1.144     dyoung   1005:                                if (top == NULL) {
1.78      matt     1006:                                        m = m_gethdr(M_WAIT, MT_DATA);
1.45      tv       1007:                                        mlen = MHLEN;
                   1008:                                        m->m_pkthdr.len = 0;
1.140     dyoung   1009:                                        m->m_pkthdr.rcvif = NULL;
1.45      tv       1010:                                } else {
1.78      matt     1011:                                        m = m_get(M_WAIT, MT_DATA);
1.45      tv       1012:                                        mlen = MLEN;
                   1013:                                }
1.78      matt     1014:                                MCLAIM(m, so->so_snd.sb_mowner);
1.121     yamt     1015:                                if (sock_loan_thresh >= 0 &&
                   1016:                                    uio->uio_iov->iov_len >= sock_loan_thresh &&
                   1017:                                    space >= sock_loan_thresh &&
1.64      thorpej  1018:                                    (len = sosend_loan(so, uio, m,
                   1019:                                                       space)) != 0) {
                   1020:                                        SOSEND_COUNTER_INCR(&sosend_loan_big);
                   1021:                                        space -= len;
                   1022:                                        goto have_data;
                   1023:                                }
1.45      tv       1024:                                if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64      thorpej  1025:                                        SOSEND_COUNTER_INCR(&sosend_copy_big);
1.78      matt     1026:                                        m_clget(m, M_WAIT);
1.45      tv       1027:                                        if ((m->m_flags & M_EXT) == 0)
                   1028:                                                goto nopages;
                   1029:                                        mlen = MCLBYTES;
                   1030:                                        if (atomic && top == 0) {
1.58      jdolecek 1031:                                                len = lmin(MCLBYTES - max_hdr,
1.54      lukem    1032:                                                    resid);
1.45      tv       1033:                                                m->m_data += max_hdr;
                   1034:                                        } else
1.58      jdolecek 1035:                                                len = lmin(MCLBYTES, resid);
1.45      tv       1036:                                        space -= len;
                   1037:                                } else {
1.64      thorpej  1038:  nopages:
                   1039:                                        SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58      jdolecek 1040:                                        len = lmin(lmin(mlen, resid), space);
1.45      tv       1041:                                        space -= len;
                   1042:                                        /*
                   1043:                                         * For datagram protocols, leave room
                   1044:                                         * for protocol headers in first mbuf.
                   1045:                                         */
                   1046:                                        if (atomic && top == 0 && len < mlen)
                   1047:                                                MH_ALIGN(m, len);
                   1048:                                }
1.144     dyoung   1049:                                error = uiomove(mtod(m, void *), (int)len, uio);
1.64      thorpej  1050:  have_data:
1.45      tv       1051:                                resid = uio->uio_resid;
                   1052:                                m->m_len = len;
                   1053:                                *mp = m;
                   1054:                                top->m_pkthdr.len += len;
1.160     ad       1055:                                s = splsoftnet();
                   1056:                                solock(so);
1.144     dyoung   1057:                                if (error != 0)
1.45      tv       1058:                                        goto release;
                   1059:                                mp = &m->m_next;
                   1060:                                if (resid <= 0) {
                   1061:                                        if (flags & MSG_EOR)
                   1062:                                                top->m_flags |= M_EOR;
                   1063:                                        break;
                   1064:                                }
                   1065:                        } while (space > 0 && atomic);
1.108     perry    1066:
1.160     ad       1067:                        if (so->so_state & SS_CANTSENDMORE) {
                   1068:                                error = EPIPE;
                   1069:                                goto release;
                   1070:                        }
1.45      tv       1071:                        if (dontroute)
                   1072:                                so->so_options |= SO_DONTROUTE;
                   1073:                        if (resid > 0)
                   1074:                                so->so_state |= SS_MORETOCOME;
1.46      sommerfe 1075:                        error = (*so->so_proto->pr_usrreq)(so,
                   1076:                            (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
1.160     ad       1077:                            top, addr, control, curlwp);
1.45      tv       1078:                        if (dontroute)
                   1079:                                so->so_options &= ~SO_DONTROUTE;
                   1080:                        if (resid > 0)
                   1081:                                so->so_state &= ~SS_MORETOCOME;
                   1082:                        clen = 0;
1.144     dyoung   1083:                        control = NULL;
                   1084:                        top = NULL;
1.45      tv       1085:                        mp = &top;
1.144     dyoung   1086:                        if (error != 0)
1.1       cgd      1087:                                goto release;
                   1088:                } while (resid && space > 0);
                   1089:        } while (resid);
                   1090:
1.54      lukem    1091:  release:
1.1       cgd      1092:        sbunlock(&so->so_snd);
1.54      lukem    1093:  out:
1.160     ad       1094:        sounlock(so);
                   1095:        splx(s);
1.1       cgd      1096:        if (top)
                   1097:                m_freem(top);
                   1098:        if (control)
                   1099:                m_freem(control);
                   1100:        return (error);
                   1101: }
                   1102:
                   1103: /*
1.159     ad       1104:  * Following replacement or removal of the first mbuf on the first
                   1105:  * mbuf chain of a socket buffer, push necessary state changes back
                   1106:  * into the socket buffer so that other consumers see the values
                   1107:  * consistently.  'nextrecord' is the callers locally stored value of
                   1108:  * the original value of sb->sb_mb->m_nextpkt which must be restored
                   1109:  * when the lead mbuf changes.  NOTE: 'nextrecord' may be NULL.
                   1110:  */
                   1111: static void
                   1112: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
                   1113: {
                   1114:
1.160     ad       1115:        KASSERT(solocked(sb->sb_so));
                   1116:
1.159     ad       1117:        /*
                   1118:         * First, update for the new value of nextrecord.  If necessary,
                   1119:         * make it the first record.
                   1120:         */
                   1121:        if (sb->sb_mb != NULL)
                   1122:                sb->sb_mb->m_nextpkt = nextrecord;
                   1123:        else
                   1124:                sb->sb_mb = nextrecord;
                   1125:
                   1126:         /*
                   1127:          * Now update any dependent socket buffer fields to reflect
                   1128:          * the new state.  This is an inline of SB_EMPTY_FIXUP, with
                   1129:          * the addition of a second clause that takes care of the
                   1130:          * case where sb_mb has been updated, but remains the last
                   1131:          * record.
                   1132:          */
                   1133:         if (sb->sb_mb == NULL) {
                   1134:                 sb->sb_mbtail = NULL;
                   1135:                 sb->sb_lastrecord = NULL;
                   1136:         } else if (sb->sb_mb->m_nextpkt == NULL)
                   1137:                 sb->sb_lastrecord = sb->sb_mb;
                   1138: }
                   1139:
                   1140: /*
1.1       cgd      1141:  * Implement receive operations on a socket.
                   1142:  * We depend on the way that records are added to the sockbuf
                   1143:  * by sbappend*.  In particular, each record (mbufs linked through m_next)
                   1144:  * must begin with an address if the protocol so specifies,
                   1145:  * followed by an optional mbuf or mbufs containing ancillary data,
                   1146:  * and then zero or more mbufs of data.
                   1147:  * In order to avoid blocking network interrupts for the entire time here,
                   1148:  * we splx() while doing the actual copy to user space.
                   1149:  * Although the sockbuf is locked, new data may still be appended,
                   1150:  * and thus we must maintain consistency of the sockbuf during that time.
                   1151:  *
                   1152:  * The caller may receive the data as a single mbuf chain by supplying
                   1153:  * an mbuf **mp0 for use in returning the chain.  The uio is then used
                   1154:  * only for the count in uio_resid.
                   1155:  */
1.3       andrew   1156: int
1.54      lukem    1157: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
                   1158:        struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1       cgd      1159: {
1.116     yamt     1160:        struct lwp *l = curlwp;
1.160     ad       1161:        struct mbuf     *m, **mp, *mt;
1.146     dyoung   1162:        int atomic, flags, len, error, s, offset, moff, type, orig_resid;
1.99      matt     1163:        const struct protosw    *pr;
1.54      lukem    1164:        struct mbuf     *nextrecord;
1.67      he       1165:        int             mbuf_removed = 0;
1.146     dyoung   1166:        const struct domain *dom;
1.196     dsl      1167:        short           wakeup_state = 0;
1.64      thorpej  1168:
1.54      lukem    1169:        pr = so->so_proto;
1.146     dyoung   1170:        atomic = pr->pr_flags & PR_ATOMIC;
                   1171:        dom = pr->pr_domain;
1.1       cgd      1172:        mp = mp0;
1.54      lukem    1173:        type = 0;
                   1174:        orig_resid = uio->uio_resid;
1.102     jonathan 1175:
1.144     dyoung   1176:        if (paddr != NULL)
                   1177:                *paddr = NULL;
                   1178:        if (controlp != NULL)
                   1179:                *controlp = NULL;
                   1180:        if (flagsp != NULL)
1.1       cgd      1181:                flags = *flagsp &~ MSG_EOR;
                   1182:        else
                   1183:                flags = 0;
1.66      enami    1184:
                   1185:        if ((flags & MSG_DONTWAIT) == 0)
1.117     yamt     1186:                sodopendfree();
1.66      enami    1187:
1.1       cgd      1188:        if (flags & MSG_OOB) {
                   1189:                m = m_get(M_WAIT, MT_DATA);
1.160     ad       1190:                solock(so);
1.17      cgd      1191:                error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m,
1.140     dyoung   1192:                    (struct mbuf *)(long)(flags & MSG_PEEK), NULL, l);
1.160     ad       1193:                sounlock(so);
1.1       cgd      1194:                if (error)
                   1195:                        goto bad;
                   1196:                do {
1.134     christos 1197:                        error = uiomove(mtod(m, void *),
1.1       cgd      1198:                            (int) min(uio->uio_resid, m->m_len), uio);
                   1199:                        m = m_free(m);
1.144     dyoung   1200:                } while (uio->uio_resid > 0 && error == 0 && m);
1.54      lukem    1201:  bad:
1.144     dyoung   1202:                if (m != NULL)
1.1       cgd      1203:                        m_freem(m);
1.144     dyoung   1204:                return error;
1.1       cgd      1205:        }
1.144     dyoung   1206:        if (mp != NULL)
1.140     dyoung   1207:                *mp = NULL;
1.160     ad       1208:
                   1209:        /*
                   1210:         * solock() provides atomicity of access.  splsoftnet() prevents
                   1211:         * protocol processing soft interrupts from interrupting us and
                   1212:         * blocking (expensive).
                   1213:         */
                   1214:        s = splsoftnet();
                   1215:        solock(so);
1.1       cgd      1216:        if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
1.140     dyoung   1217:                (*pr->pr_usrreq)(so, PRU_RCVD, NULL, NULL, NULL, l);
1.1       cgd      1218:
1.54      lukem    1219:  restart:
1.160     ad       1220:        if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
                   1221:                sounlock(so);
                   1222:                splx(s);
1.144     dyoung   1223:                return error;
1.160     ad       1224:        }
1.1       cgd      1225:
                   1226:        m = so->so_rcv.sb_mb;
                   1227:        /*
                   1228:         * If we have less data than requested, block awaiting more
                   1229:         * (subject to any timeout) if:
1.15      mycroft  1230:         *   1. the current count is less than the low water mark,
1.1       cgd      1231:         *   2. MSG_WAITALL is set, and it is possible to do the entire
1.15      mycroft  1232:         *      receive operation at once if we block (resid <= hiwat), or
                   1233:         *   3. MSG_DONTWAIT is not set.
1.1       cgd      1234:         * If MSG_WAITALL is set but resid is larger than the receive buffer,
                   1235:         * we have to do the receive in sections, and thus risk returning
                   1236:         * a short count if a timeout or signal occurs after we start.
                   1237:         */
1.144     dyoung   1238:        if (m == NULL ||
                   1239:            ((flags & MSG_DONTWAIT) == 0 &&
                   1240:             so->so_rcv.sb_cc < uio->uio_resid &&
                   1241:             (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
                   1242:              ((flags & MSG_WAITALL) &&
                   1243:               uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146     dyoung   1244:             m->m_nextpkt == NULL && !atomic)) {
1.1       cgd      1245: #ifdef DIAGNOSTIC
1.144     dyoung   1246:                if (m == NULL && so->so_rcv.sb_cc)
1.1       cgd      1247:                        panic("receive 1");
                   1248: #endif
                   1249:                if (so->so_error) {
1.144     dyoung   1250:                        if (m != NULL)
1.15      mycroft  1251:                                goto dontblock;
1.1       cgd      1252:                        error = so->so_error;
                   1253:                        if ((flags & MSG_PEEK) == 0)
                   1254:                                so->so_error = 0;
                   1255:                        goto release;
                   1256:                }
                   1257:                if (so->so_state & SS_CANTRCVMORE) {
1.144     dyoung   1258:                        if (m != NULL)
1.15      mycroft  1259:                                goto dontblock;
1.1       cgd      1260:                        else
                   1261:                                goto release;
                   1262:                }
1.144     dyoung   1263:                for (; m != NULL; m = m->m_next)
1.1       cgd      1264:                        if (m->m_type == MT_OOBDATA  || (m->m_flags & M_EOR)) {
                   1265:                                m = so->so_rcv.sb_mb;
                   1266:                                goto dontblock;
                   1267:                        }
                   1268:                if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
                   1269:                    (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
                   1270:                        error = ENOTCONN;
                   1271:                        goto release;
                   1272:                }
                   1273:                if (uio->uio_resid == 0)
                   1274:                        goto release;
1.151     ad       1275:                if (so->so_nbio || (flags & MSG_DONTWAIT)) {
1.1       cgd      1276:                        error = EWOULDBLOCK;
                   1277:                        goto release;
                   1278:                }
1.69      thorpej  1279:                SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
                   1280:                SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1       cgd      1281:                sbunlock(&so->so_rcv);
1.196     dsl      1282:                if (wakeup_state & SS_RESTARTSYS)
                   1283:                        error = ERESTART;
                   1284:                else
                   1285:                        error = sbwait(&so->so_rcv);
1.160     ad       1286:                if (error != 0) {
                   1287:                        sounlock(so);
                   1288:                        splx(s);
1.144     dyoung   1289:                        return error;
1.160     ad       1290:                }
1.196     dsl      1291:                wakeup_state = so->so_state;
1.1       cgd      1292:                goto restart;
                   1293:        }
1.54      lukem    1294:  dontblock:
1.69      thorpej  1295:        /*
                   1296:         * On entry here, m points to the first record of the socket buffer.
1.159     ad       1297:         * From this point onward, we maintain 'nextrecord' as a cache of the
                   1298:         * pointer to the next record in the socket buffer.  We must keep the
                   1299:         * various socket buffer pointers and local stack versions of the
                   1300:         * pointers in sync, pushing out modifications before dropping the
1.160     ad       1301:         * socket lock, and re-reading them when picking it up.
1.159     ad       1302:         *
                   1303:         * Otherwise, we will race with the network stack appending new data
                   1304:         * or records onto the socket buffer by using inconsistent/stale
                   1305:         * versions of the field, possibly resulting in socket buffer
                   1306:         * corruption.
                   1307:         *
                   1308:         * By holding the high-level sblock(), we prevent simultaneous
                   1309:         * readers from pulling off the front of the socket buffer.
1.69      thorpej  1310:         */
1.144     dyoung   1311:        if (l != NULL)
1.157     ad       1312:                l->l_ru.ru_msgrcv++;
1.69      thorpej  1313:        KASSERT(m == so->so_rcv.sb_mb);
                   1314:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
                   1315:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1       cgd      1316:        nextrecord = m->m_nextpkt;
                   1317:        if (pr->pr_flags & PR_ADDR) {
                   1318: #ifdef DIAGNOSTIC
                   1319:                if (m->m_type != MT_SONAME)
                   1320:                        panic("receive 1a");
                   1321: #endif
1.3       andrew   1322:                orig_resid = 0;
1.1       cgd      1323:                if (flags & MSG_PEEK) {
                   1324:                        if (paddr)
                   1325:                                *paddr = m_copy(m, 0, m->m_len);
                   1326:                        m = m->m_next;
                   1327:                } else {
                   1328:                        sbfree(&so->so_rcv, m);
1.67      he       1329:                        mbuf_removed = 1;
1.144     dyoung   1330:                        if (paddr != NULL) {
1.1       cgd      1331:                                *paddr = m;
                   1332:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1333:                                m->m_next = NULL;
1.1       cgd      1334:                                m = so->so_rcv.sb_mb;
                   1335:                        } else {
                   1336:                                MFREE(m, so->so_rcv.sb_mb);
                   1337:                                m = so->so_rcv.sb_mb;
                   1338:                        }
1.159     ad       1339:                        sbsync(&so->so_rcv, nextrecord);
1.1       cgd      1340:                }
                   1341:        }
1.159     ad       1342:
                   1343:        /*
                   1344:         * Process one or more MT_CONTROL mbufs present before any data mbufs
                   1345:         * in the first mbuf chain on the socket buffer.  If MSG_PEEK, we
                   1346:         * just copy the data; if !MSG_PEEK, we call into the protocol to
                   1347:         * perform externalization (or freeing if controlp == NULL).
                   1348:         */
                   1349:        if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
                   1350:                struct mbuf *cm = NULL, *cmn;
                   1351:                struct mbuf **cme = &cm;
                   1352:
                   1353:                do {
                   1354:                        if (flags & MSG_PEEK) {
                   1355:                                if (controlp != NULL) {
                   1356:                                        *controlp = m_copy(m, 0, m->m_len);
                   1357:                                        controlp = &(*controlp)->m_next;
                   1358:                                }
                   1359:                                m = m->m_next;
                   1360:                        } else {
                   1361:                                sbfree(&so->so_rcv, m);
1.1       cgd      1362:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1363:                                m->m_next = NULL;
1.159     ad       1364:                                *cme = m;
                   1365:                                cme = &(*cme)->m_next;
1.1       cgd      1366:                                m = so->so_rcv.sb_mb;
1.159     ad       1367:                        }
                   1368:                } while (m != NULL && m->m_type == MT_CONTROL);
                   1369:                if ((flags & MSG_PEEK) == 0)
                   1370:                        sbsync(&so->so_rcv, nextrecord);
                   1371:                for (; cm != NULL; cm = cmn) {
                   1372:                        cmn = cm->m_next;
                   1373:                        cm->m_next = NULL;
                   1374:                        type = mtod(cm, struct cmsghdr *)->cmsg_type;
                   1375:                        if (controlp != NULL) {
                   1376:                                if (dom->dom_externalize != NULL &&
                   1377:                                    type == SCM_RIGHTS) {
1.160     ad       1378:                                        sounlock(so);
1.159     ad       1379:                                        splx(s);
                   1380:                                        error = (*dom->dom_externalize)(cm, l);
                   1381:                                        s = splsoftnet();
1.160     ad       1382:                                        solock(so);
1.159     ad       1383:                                }
                   1384:                                *controlp = cm;
                   1385:                                while (*controlp != NULL)
                   1386:                                        controlp = &(*controlp)->m_next;
1.1       cgd      1387:                        } else {
1.106     itojun   1388:                                /*
                   1389:                                 * Dispose of any SCM_RIGHTS message that went
                   1390:                                 * through the read path rather than recv.
                   1391:                                 */
1.159     ad       1392:                                if (dom->dom_dispose != NULL &&
                   1393:                                    type == SCM_RIGHTS) {
1.160     ad       1394:                                        sounlock(so);
1.159     ad       1395:                                        (*dom->dom_dispose)(cm);
1.160     ad       1396:                                        solock(so);
1.159     ad       1397:                                }
                   1398:                                m_freem(cm);
1.1       cgd      1399:                        }
                   1400:                }
1.159     ad       1401:                if (m != NULL)
                   1402:                        nextrecord = so->so_rcv.sb_mb->m_nextpkt;
                   1403:                else
                   1404:                        nextrecord = so->so_rcv.sb_mb;
                   1405:                orig_resid = 0;
1.1       cgd      1406:        }
1.69      thorpej  1407:
1.159     ad       1408:        /* If m is non-NULL, we have some data to read. */
                   1409:        if (__predict_true(m != NULL)) {
1.1       cgd      1410:                type = m->m_type;
                   1411:                if (type == MT_OOBDATA)
                   1412:                        flags |= MSG_OOB;
                   1413:        }
1.69      thorpej  1414:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
                   1415:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
                   1416:
1.1       cgd      1417:        moff = 0;
                   1418:        offset = 0;
1.144     dyoung   1419:        while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1       cgd      1420:                if (m->m_type == MT_OOBDATA) {
                   1421:                        if (type != MT_OOBDATA)
                   1422:                                break;
                   1423:                } else if (type == MT_OOBDATA)
                   1424:                        break;
                   1425: #ifdef DIAGNOSTIC
                   1426:                else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
                   1427:                        panic("receive 3");
                   1428: #endif
                   1429:                so->so_state &= ~SS_RCVATMARK;
1.196     dsl      1430:                wakeup_state = 0;
1.1       cgd      1431:                len = uio->uio_resid;
                   1432:                if (so->so_oobmark && len > so->so_oobmark - offset)
                   1433:                        len = so->so_oobmark - offset;
                   1434:                if (len > m->m_len - moff)
                   1435:                        len = m->m_len - moff;
                   1436:                /*
                   1437:                 * If mp is set, just pass back the mbufs.
                   1438:                 * Otherwise copy them out via the uio, then free.
                   1439:                 * Sockbuf must be consistent here (points to current mbuf,
                   1440:                 * it points to next record) when we drop priority;
                   1441:                 * we must note any additions to the sockbuf when we
                   1442:                 * block interrupts again.
                   1443:                 */
1.144     dyoung   1444:                if (mp == NULL) {
1.69      thorpej  1445:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
                   1446:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160     ad       1447:                        sounlock(so);
1.1       cgd      1448:                        splx(s);
1.134     christos 1449:                        error = uiomove(mtod(m, char *) + moff, (int)len, uio);
1.20      mycroft  1450:                        s = splsoftnet();
1.160     ad       1451:                        solock(so);
1.144     dyoung   1452:                        if (error != 0) {
1.67      he       1453:                                /*
                   1454:                                 * If any part of the record has been removed
                   1455:                                 * (such as the MT_SONAME mbuf, which will
                   1456:                                 * happen when PR_ADDR, and thus also
                   1457:                                 * PR_ATOMIC, is set), then drop the entire
                   1458:                                 * record to maintain the atomicity of the
                   1459:                                 * receive operation.
                   1460:                                 *
                   1461:                                 * This avoids a later panic("receive 1a")
                   1462:                                 * when compiled with DIAGNOSTIC.
                   1463:                                 */
1.146     dyoung   1464:                                if (m && mbuf_removed && atomic)
1.67      he       1465:                                        (void) sbdroprecord(&so->so_rcv);
                   1466:
1.57      jdolecek 1467:                                goto release;
1.67      he       1468:                        }
1.1       cgd      1469:                } else
                   1470:                        uio->uio_resid -= len;
                   1471:                if (len == m->m_len - moff) {
                   1472:                        if (m->m_flags & M_EOR)
                   1473:                                flags |= MSG_EOR;
                   1474:                        if (flags & MSG_PEEK) {
                   1475:                                m = m->m_next;
                   1476:                                moff = 0;
                   1477:                        } else {
                   1478:                                nextrecord = m->m_nextpkt;
                   1479:                                sbfree(&so->so_rcv, m);
                   1480:                                if (mp) {
                   1481:                                        *mp = m;
                   1482:                                        mp = &m->m_next;
                   1483:                                        so->so_rcv.sb_mb = m = m->m_next;
1.140     dyoung   1484:                                        *mp = NULL;
1.1       cgd      1485:                                } else {
                   1486:                                        MFREE(m, so->so_rcv.sb_mb);
                   1487:                                        m = so->so_rcv.sb_mb;
                   1488:                                }
1.69      thorpej  1489:                                /*
                   1490:                                 * If m != NULL, we also know that
                   1491:                                 * so->so_rcv.sb_mb != NULL.
                   1492:                                 */
                   1493:                                KASSERT(so->so_rcv.sb_mb == m);
                   1494:                                if (m) {
1.1       cgd      1495:                                        m->m_nextpkt = nextrecord;
1.69      thorpej  1496:                                        if (nextrecord == NULL)
                   1497:                                                so->so_rcv.sb_lastrecord = m;
                   1498:                                } else {
                   1499:                                        so->so_rcv.sb_mb = nextrecord;
1.70      thorpej  1500:                                        SB_EMPTY_FIXUP(&so->so_rcv);
1.69      thorpej  1501:                                }
                   1502:                                SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
                   1503:                                SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1       cgd      1504:                        }
1.144     dyoung   1505:                } else if (flags & MSG_PEEK)
                   1506:                        moff += len;
                   1507:                else {
1.160     ad       1508:                        if (mp != NULL) {
                   1509:                                mt = m_copym(m, 0, len, M_NOWAIT);
                   1510:                                if (__predict_false(mt == NULL)) {
                   1511:                                        sounlock(so);
                   1512:                                        mt = m_copym(m, 0, len, M_WAIT);
                   1513:                                        solock(so);
                   1514:                                }
                   1515:                                *mp = mt;
                   1516:                        }
1.144     dyoung   1517:                        m->m_data += len;
                   1518:                        m->m_len -= len;
                   1519:                        so->so_rcv.sb_cc -= len;
1.1       cgd      1520:                }
                   1521:                if (so->so_oobmark) {
                   1522:                        if ((flags & MSG_PEEK) == 0) {
                   1523:                                so->so_oobmark -= len;
                   1524:                                if (so->so_oobmark == 0) {
                   1525:                                        so->so_state |= SS_RCVATMARK;
                   1526:                                        break;
                   1527:                                }
1.7       cgd      1528:                        } else {
1.1       cgd      1529:                                offset += len;
1.7       cgd      1530:                                if (offset == so->so_oobmark)
                   1531:                                        break;
                   1532:                        }
1.1       cgd      1533:                }
                   1534:                if (flags & MSG_EOR)
                   1535:                        break;
                   1536:                /*
                   1537:                 * If the MSG_WAITALL flag is set (for non-atomic socket),
                   1538:                 * we must not quit until "uio->uio_resid == 0" or an error
                   1539:                 * termination.  If a signal/timeout occurs, return
                   1540:                 * with a short count but without error.
                   1541:                 * Keep sockbuf locked against other readers.
                   1542:                 */
1.144     dyoung   1543:                while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3       andrew   1544:                    !sosendallatonce(so) && !nextrecord) {
1.1       cgd      1545:                        if (so->so_error || so->so_state & SS_CANTRCVMORE)
                   1546:                                break;
1.68      matt     1547:                        /*
                   1548:                         * If we are peeking and the socket receive buffer is
                   1549:                         * full, stop since we can't get more data to peek at.
                   1550:                         */
                   1551:                        if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
                   1552:                                break;
                   1553:                        /*
                   1554:                         * If we've drained the socket buffer, tell the
                   1555:                         * protocol in case it needs to do something to
                   1556:                         * get it filled again.
                   1557:                         */
                   1558:                        if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
                   1559:                                (*pr->pr_usrreq)(so, PRU_RCVD,
1.140     dyoung   1560:                                    NULL, (struct mbuf *)(long)flags, NULL, l);
1.69      thorpej  1561:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
                   1562:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196     dsl      1563:                        if (wakeup_state & SS_RESTARTSYS)
                   1564:                                error = ERESTART;
                   1565:                        else
                   1566:                                error = sbwait(&so->so_rcv);
1.144     dyoung   1567:                        if (error != 0) {
1.1       cgd      1568:                                sbunlock(&so->so_rcv);
1.160     ad       1569:                                sounlock(so);
1.1       cgd      1570:                                splx(s);
1.144     dyoung   1571:                                return 0;
1.1       cgd      1572:                        }
1.21      christos 1573:                        if ((m = so->so_rcv.sb_mb) != NULL)
1.1       cgd      1574:                                nextrecord = m->m_nextpkt;
1.196     dsl      1575:                        wakeup_state = so->so_state;
1.1       cgd      1576:                }
                   1577:        }
1.3       andrew   1578:
1.146     dyoung   1579:        if (m && atomic) {
1.3       andrew   1580:                flags |= MSG_TRUNC;
                   1581:                if ((flags & MSG_PEEK) == 0)
                   1582:                        (void) sbdroprecord(&so->so_rcv);
                   1583:        }
1.1       cgd      1584:        if ((flags & MSG_PEEK) == 0) {
1.144     dyoung   1585:                if (m == NULL) {
1.69      thorpej  1586:                        /*
1.70      thorpej  1587:                         * First part is an inline SB_EMPTY_FIXUP().  Second
1.69      thorpej  1588:                         * part makes sure sb_lastrecord is up-to-date if
                   1589:                         * there is still data in the socket buffer.
                   1590:                         */
1.1       cgd      1591:                        so->so_rcv.sb_mb = nextrecord;
1.69      thorpej  1592:                        if (so->so_rcv.sb_mb == NULL) {
                   1593:                                so->so_rcv.sb_mbtail = NULL;
                   1594:                                so->so_rcv.sb_lastrecord = NULL;
                   1595:                        } else if (nextrecord->m_nextpkt == NULL)
                   1596:                                so->so_rcv.sb_lastrecord = nextrecord;
                   1597:                }
                   1598:                SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
                   1599:                SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1       cgd      1600:                if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.140     dyoung   1601:                        (*pr->pr_usrreq)(so, PRU_RCVD, NULL,
                   1602:                            (struct mbuf *)(long)flags, NULL, l);
1.1       cgd      1603:        }
1.3       andrew   1604:        if (orig_resid == uio->uio_resid && orig_resid &&
                   1605:            (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
                   1606:                sbunlock(&so->so_rcv);
                   1607:                goto restart;
                   1608:        }
1.108     perry    1609:
1.144     dyoung   1610:        if (flagsp != NULL)
1.1       cgd      1611:                *flagsp |= flags;
1.54      lukem    1612:  release:
1.1       cgd      1613:        sbunlock(&so->so_rcv);
1.160     ad       1614:        sounlock(so);
1.1       cgd      1615:        splx(s);
1.144     dyoung   1616:        return error;
1.1       cgd      1617: }
                   1618:
1.14      mycroft  1619: int
1.54      lukem    1620: soshutdown(struct socket *so, int how)
1.1       cgd      1621: {
1.99      matt     1622:        const struct protosw    *pr;
1.160     ad       1623:        int     error;
                   1624:
                   1625:        KASSERT(solocked(so));
1.34      kleink   1626:
1.54      lukem    1627:        pr = so->so_proto;
1.34      kleink   1628:        if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
                   1629:                return (EINVAL);
1.1       cgd      1630:
1.160     ad       1631:        if (how == SHUT_RD || how == SHUT_RDWR) {
1.1       cgd      1632:                sorflush(so);
1.160     ad       1633:                error = 0;
                   1634:        }
1.34      kleink   1635:        if (how == SHUT_WR || how == SHUT_RDWR)
1.160     ad       1636:                error = (*pr->pr_usrreq)(so, PRU_SHUTDOWN, NULL,
1.140     dyoung   1637:                    NULL, NULL, NULL);
1.160     ad       1638:
                   1639:        return error;
1.1       cgd      1640: }
                   1641:
1.195     dsl      1642: void
1.196     dsl      1643: sorestart(struct socket *so)
1.188     ad       1644: {
1.196     dsl      1645:        /*
                   1646:         * An application has called close() on an fd on which another
                   1647:         * of its threads has called a socket system call.
                   1648:         * Mark this and wake everyone up, and code that would block again
                   1649:         * instead returns ERESTART.
                   1650:         * On system call re-entry the fd is validated and EBADF returned.
                   1651:         * Any other fd will block again on the 2nd syscall.
                   1652:         */
1.188     ad       1653:        solock(so);
1.196     dsl      1654:        so->so_state |= SS_RESTARTSYS;
1.188     ad       1655:        cv_broadcast(&so->so_cv);
1.196     dsl      1656:        cv_broadcast(&so->so_snd.sb_cv);
                   1657:        cv_broadcast(&so->so_rcv.sb_cv);
1.188     ad       1658:        sounlock(so);
                   1659: }
                   1660:
1.14      mycroft  1661: void
1.54      lukem    1662: sorflush(struct socket *so)
1.1       cgd      1663: {
1.54      lukem    1664:        struct sockbuf  *sb, asb;
1.99      matt     1665:        const struct protosw    *pr;
1.160     ad       1666:
                   1667:        KASSERT(solocked(so));
1.1       cgd      1668:
1.54      lukem    1669:        sb = &so->so_rcv;
                   1670:        pr = so->so_proto;
1.160     ad       1671:        socantrcvmore(so);
1.1       cgd      1672:        sb->sb_flags |= SB_NOINTR;
1.160     ad       1673:        (void )sblock(sb, M_WAITOK);
1.1       cgd      1674:        sbunlock(sb);
                   1675:        asb = *sb;
1.86      wrstuden 1676:        /*
                   1677:         * Clear most of the sockbuf structure, but leave some of the
                   1678:         * fields valid.
                   1679:         */
                   1680:        memset(&sb->sb_startzero, 0,
                   1681:            sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160     ad       1682:        if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
                   1683:                sounlock(so);
1.1       cgd      1684:                (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160     ad       1685:                solock(so);
                   1686:        }
1.98      christos 1687:        sbrelease(&asb, so);
1.1       cgd      1688: }
                   1689:
1.171     plunky   1690: /*
                   1691:  * internal set SOL_SOCKET options
                   1692:  */
1.142     dyoung   1693: static int
1.171     plunky   1694: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1       cgd      1695: {
1.182     christos 1696:        int error = EINVAL, optval, opt;
1.171     plunky   1697:        struct linger l;
                   1698:        struct timeval tv;
1.142     dyoung   1699:
1.179     christos 1700:        switch ((opt = sopt->sopt_name)) {
1.142     dyoung   1701:
1.170     tls      1702:        case SO_ACCEPTFILTER:
1.177     ad       1703:                error = accept_filt_setopt(so, sopt);
                   1704:                KASSERT(solocked(so));
1.170     tls      1705:                break;
                   1706:
1.171     plunky   1707:        case SO_LINGER:
                   1708:                error = sockopt_get(sopt, &l, sizeof(l));
1.177     ad       1709:                solock(so);
1.171     plunky   1710:                if (error)
1.177     ad       1711:                        break;
1.171     plunky   1712:                if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1.177     ad       1713:                    l.l_linger > (INT_MAX / hz)) {
                   1714:                        error = EDOM;
                   1715:                        break;
                   1716:                }
1.171     plunky   1717:                so->so_linger = l.l_linger;
                   1718:                if (l.l_onoff)
                   1719:                        so->so_options |= SO_LINGER;
                   1720:                else
                   1721:                        so->so_options &= ~SO_LINGER;
1.177     ad       1722:                break;
1.1       cgd      1723:
1.142     dyoung   1724:        case SO_DEBUG:
                   1725:        case SO_KEEPALIVE:
                   1726:        case SO_DONTROUTE:
                   1727:        case SO_USELOOPBACK:
                   1728:        case SO_BROADCAST:
                   1729:        case SO_REUSEADDR:
                   1730:        case SO_REUSEPORT:
                   1731:        case SO_OOBINLINE:
                   1732:        case SO_TIMESTAMP:
1.184     christos 1733: #ifdef SO_OTIMESTAMP
                   1734:        case SO_OTIMESTAMP:
                   1735: #endif
1.171     plunky   1736:                error = sockopt_getint(sopt, &optval);
1.177     ad       1737:                solock(so);
1.171     plunky   1738:                if (error)
1.177     ad       1739:                        break;
1.171     plunky   1740:                if (optval)
1.179     christos 1741:                        so->so_options |= opt;
1.142     dyoung   1742:                else
1.179     christos 1743:                        so->so_options &= ~opt;
1.142     dyoung   1744:                break;
                   1745:
                   1746:        case SO_SNDBUF:
                   1747:        case SO_RCVBUF:
                   1748:        case SO_SNDLOWAT:
                   1749:        case SO_RCVLOWAT:
1.171     plunky   1750:                error = sockopt_getint(sopt, &optval);
1.177     ad       1751:                solock(so);
1.171     plunky   1752:                if (error)
1.177     ad       1753:                        break;
1.1       cgd      1754:
1.142     dyoung   1755:                /*
                   1756:                 * Values < 1 make no sense for any of these
                   1757:                 * options, so disallow them.
                   1758:                 */
1.177     ad       1759:                if (optval < 1) {
                   1760:                        error = EINVAL;
                   1761:                        break;
                   1762:                }
1.1       cgd      1763:
1.179     christos 1764:                switch (opt) {
1.171     plunky   1765:                case SO_SNDBUF:
1.177     ad       1766:                        if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
                   1767:                                error = ENOBUFS;
                   1768:                                break;
                   1769:                        }
1.171     plunky   1770:                        so->so_snd.sb_flags &= ~SB_AUTOSIZE;
                   1771:                        break;
1.1       cgd      1772:
                   1773:                case SO_RCVBUF:
1.177     ad       1774:                        if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
                   1775:                                error = ENOBUFS;
                   1776:                                break;
                   1777:                        }
1.171     plunky   1778:                        so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142     dyoung   1779:                        break;
                   1780:
                   1781:                /*
                   1782:                 * Make sure the low-water is never greater than
                   1783:                 * the high-water.
                   1784:                 */
1.1       cgd      1785:                case SO_SNDLOWAT:
1.171     plunky   1786:                        if (optval > so->so_snd.sb_hiwat)
                   1787:                                optval = so->so_snd.sb_hiwat;
                   1788:
                   1789:                        so->so_snd.sb_lowat = optval;
1.142     dyoung   1790:                        break;
1.171     plunky   1791:
1.1       cgd      1792:                case SO_RCVLOWAT:
1.171     plunky   1793:                        if (optval > so->so_rcv.sb_hiwat)
                   1794:                                optval = so->so_rcv.sb_hiwat;
                   1795:
                   1796:                        so->so_rcv.sb_lowat = optval;
1.142     dyoung   1797:                        break;
                   1798:                }
                   1799:                break;
1.28      thorpej  1800:
1.179     christos 1801: #ifdef COMPAT_50
                   1802:        case SO_OSNDTIMEO:
                   1803:        case SO_ORCVTIMEO: {
                   1804:                struct timeval50 otv;
                   1805:                error = sockopt_get(sopt, &otv, sizeof(otv));
1.186     pooka    1806:                if (error) {
                   1807:                        solock(so);
1.183     christos 1808:                        break;
1.186     pooka    1809:                }
1.179     christos 1810:                timeval50_to_timeval(&otv, &tv);
                   1811:                opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182     christos 1812:                error = 0;
1.179     christos 1813:                /*FALLTHROUGH*/
                   1814:        }
                   1815: #endif /* COMPAT_50 */
                   1816:
1.142     dyoung   1817:        case SO_SNDTIMEO:
                   1818:        case SO_RCVTIMEO:
1.182     christos 1819:                if (error)
1.179     christos 1820:                        error = sockopt_get(sopt, &tv, sizeof(tv));
1.177     ad       1821:                solock(so);
1.171     plunky   1822:                if (error)
1.177     ad       1823:                        break;
1.171     plunky   1824:
1.177     ad       1825:                if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
                   1826:                        error = EDOM;
                   1827:                        break;
                   1828:                }
1.28      thorpej  1829:
1.171     plunky   1830:                optval = tv.tv_sec * hz + tv.tv_usec / tick;
                   1831:                if (optval == 0 && tv.tv_usec != 0)
                   1832:                        optval = 1;
1.28      thorpej  1833:
1.179     christos 1834:                switch (opt) {
1.142     dyoung   1835:                case SO_SNDTIMEO:
1.171     plunky   1836:                        so->so_snd.sb_timeo = optval;
1.1       cgd      1837:                        break;
                   1838:                case SO_RCVTIMEO:
1.171     plunky   1839:                        so->so_rcv.sb_timeo = optval;
1.142     dyoung   1840:                        break;
                   1841:                }
                   1842:                break;
1.1       cgd      1843:
1.142     dyoung   1844:        default:
1.177     ad       1845:                solock(so);
                   1846:                error = ENOPROTOOPT;
                   1847:                break;
1.142     dyoung   1848:        }
1.177     ad       1849:        KASSERT(solocked(so));
                   1850:        return error;
1.142     dyoung   1851: }
1.1       cgd      1852:
1.142     dyoung   1853: int
1.171     plunky   1854: sosetopt(struct socket *so, struct sockopt *sopt)
1.142     dyoung   1855: {
                   1856:        int error, prerr;
1.1       cgd      1857:
1.177     ad       1858:        if (sopt->sopt_level == SOL_SOCKET) {
1.171     plunky   1859:                error = sosetopt1(so, sopt);
1.177     ad       1860:                KASSERT(solocked(so));
                   1861:        } else {
1.142     dyoung   1862:                error = ENOPROTOOPT;
1.177     ad       1863:                solock(so);
                   1864:        }
1.1       cgd      1865:
1.142     dyoung   1866:        if ((error == 0 || error == ENOPROTOOPT) &&
                   1867:            so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
                   1868:                /* give the protocol stack a shot */
1.171     plunky   1869:                prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142     dyoung   1870:                if (prerr == 0)
                   1871:                        error = 0;
                   1872:                else if (prerr != ENOPROTOOPT)
                   1873:                        error = prerr;
1.171     plunky   1874:        }
1.160     ad       1875:        sounlock(so);
1.142     dyoung   1876:        return error;
1.1       cgd      1877: }
                   1878:
1.171     plunky   1879: /*
                   1880:  * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
                   1881:  */
                   1882: int
                   1883: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
                   1884:     const void *val, size_t valsize)
                   1885: {
                   1886:        struct sockopt sopt;
                   1887:        int error;
                   1888:
                   1889:        KASSERT(valsize == 0 || val != NULL);
                   1890:
                   1891:        sockopt_init(&sopt, level, name, valsize);
                   1892:        sockopt_set(&sopt, val, valsize);
                   1893:
                   1894:        error = sosetopt(so, &sopt);
                   1895:
                   1896:        sockopt_destroy(&sopt);
                   1897:
                   1898:        return error;
                   1899: }
                   1900:
                   1901: /*
                   1902:  * internal get SOL_SOCKET options
                   1903:  */
                   1904: static int
                   1905: sogetopt1(struct socket *so, struct sockopt *sopt)
                   1906: {
1.179     christos 1907:        int error, optval, opt;
1.171     plunky   1908:        struct linger l;
                   1909:        struct timeval tv;
                   1910:
1.179     christos 1911:        switch ((opt = sopt->sopt_name)) {
1.171     plunky   1912:
                   1913:        case SO_ACCEPTFILTER:
1.177     ad       1914:                error = accept_filt_getopt(so, sopt);
1.171     plunky   1915:                break;
                   1916:
                   1917:        case SO_LINGER:
                   1918:                l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
                   1919:                l.l_linger = so->so_linger;
                   1920:
                   1921:                error = sockopt_set(sopt, &l, sizeof(l));
                   1922:                break;
                   1923:
                   1924:        case SO_USELOOPBACK:
                   1925:        case SO_DONTROUTE:
                   1926:        case SO_DEBUG:
                   1927:        case SO_KEEPALIVE:
                   1928:        case SO_REUSEADDR:
                   1929:        case SO_REUSEPORT:
                   1930:        case SO_BROADCAST:
                   1931:        case SO_OOBINLINE:
                   1932:        case SO_TIMESTAMP:
1.184     christos 1933: #ifdef SO_OTIMESTAMP
                   1934:        case SO_OTIMESTAMP:
                   1935: #endif
1.179     christos 1936:                error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171     plunky   1937:                break;
                   1938:
                   1939:        case SO_TYPE:
                   1940:                error = sockopt_setint(sopt, so->so_type);
                   1941:                break;
                   1942:
                   1943:        case SO_ERROR:
                   1944:                error = sockopt_setint(sopt, so->so_error);
                   1945:                so->so_error = 0;
                   1946:                break;
                   1947:
                   1948:        case SO_SNDBUF:
                   1949:                error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
                   1950:                break;
                   1951:
                   1952:        case SO_RCVBUF:
                   1953:                error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
                   1954:                break;
                   1955:
                   1956:        case SO_SNDLOWAT:
                   1957:                error = sockopt_setint(sopt, so->so_snd.sb_lowat);
                   1958:                break;
                   1959:
                   1960:        case SO_RCVLOWAT:
                   1961:                error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
                   1962:                break;
                   1963:
1.179     christos 1964: #ifdef COMPAT_50
                   1965:        case SO_OSNDTIMEO:
                   1966:        case SO_ORCVTIMEO: {
                   1967:                struct timeval50 otv;
                   1968:
                   1969:                optval = (opt == SO_OSNDTIMEO ?
                   1970:                     so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
                   1971:
                   1972:                otv.tv_sec = optval / hz;
                   1973:                otv.tv_usec = (optval % hz) * tick;
                   1974:
                   1975:                error = sockopt_set(sopt, &otv, sizeof(otv));
                   1976:                break;
                   1977:        }
                   1978: #endif /* COMPAT_50 */
                   1979:
1.171     plunky   1980:        case SO_SNDTIMEO:
                   1981:        case SO_RCVTIMEO:
1.179     christos 1982:                optval = (opt == SO_SNDTIMEO ?
1.171     plunky   1983:                     so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
                   1984:
                   1985:                tv.tv_sec = optval / hz;
                   1986:                tv.tv_usec = (optval % hz) * tick;
                   1987:
                   1988:                error = sockopt_set(sopt, &tv, sizeof(tv));
                   1989:                break;
                   1990:
                   1991:        case SO_OVERFLOWED:
                   1992:                error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
                   1993:                break;
                   1994:
                   1995:        default:
                   1996:                error = ENOPROTOOPT;
                   1997:                break;
                   1998:        }
                   1999:
                   2000:        return (error);
                   2001: }
                   2002:
1.14      mycroft  2003: int
1.171     plunky   2004: sogetopt(struct socket *so, struct sockopt *sopt)
1.1       cgd      2005: {
1.160     ad       2006:        int             error;
1.1       cgd      2007:
1.160     ad       2008:        solock(so);
1.171     plunky   2009:        if (sopt->sopt_level != SOL_SOCKET) {
1.1       cgd      2010:                if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160     ad       2011:                        error = ((*so->so_proto->pr_ctloutput)
1.171     plunky   2012:                            (PRCO_GETOPT, so, sopt));
1.1       cgd      2013:                } else
1.160     ad       2014:                        error = (ENOPROTOOPT);
1.1       cgd      2015:        } else {
1.171     plunky   2016:                error = sogetopt1(so, sopt);
                   2017:        }
                   2018:        sounlock(so);
                   2019:        return (error);
                   2020: }
                   2021:
                   2022: /*
                   2023:  * alloc sockopt data buffer buffer
                   2024:  *     - will be released at destroy
                   2025:  */
1.176     plunky   2026: static int
                   2027: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171     plunky   2028: {
                   2029:
                   2030:        KASSERT(sopt->sopt_size == 0);
                   2031:
1.176     plunky   2032:        if (len > sizeof(sopt->sopt_buf)) {
                   2033:                sopt->sopt_data = kmem_zalloc(len, kmflag);
                   2034:                if (sopt->sopt_data == NULL)
                   2035:                        return ENOMEM;
                   2036:        } else
1.171     plunky   2037:                sopt->sopt_data = sopt->sopt_buf;
                   2038:
                   2039:        sopt->sopt_size = len;
1.176     plunky   2040:        return 0;
1.171     plunky   2041: }
                   2042:
                   2043: /*
                   2044:  * initialise sockopt storage
1.176     plunky   2045:  *     - MAY sleep during allocation
1.171     plunky   2046:  */
                   2047: void
                   2048: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
                   2049: {
1.1       cgd      2050:
1.171     plunky   2051:        memset(sopt, 0, sizeof(*sopt));
1.1       cgd      2052:
1.171     plunky   2053:        sopt->sopt_level = level;
                   2054:        sopt->sopt_name = name;
1.176     plunky   2055:        (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171     plunky   2056: }
                   2057:
                   2058: /*
                   2059:  * destroy sockopt storage
                   2060:  *     - will release any held memory references
                   2061:  */
                   2062: void
                   2063: sockopt_destroy(struct sockopt *sopt)
                   2064: {
                   2065:
                   2066:        if (sopt->sopt_data != sopt->sopt_buf)
1.173     plunky   2067:                kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171     plunky   2068:
                   2069:        memset(sopt, 0, sizeof(*sopt));
                   2070: }
                   2071:
                   2072: /*
                   2073:  * set sockopt value
                   2074:  *     - value is copied into sockopt
1.176     plunky   2075:  *     - memory is allocated when necessary, will not sleep
1.171     plunky   2076:  */
                   2077: int
                   2078: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
                   2079: {
1.176     plunky   2080:        int error;
1.171     plunky   2081:
1.176     plunky   2082:        if (sopt->sopt_size == 0) {
                   2083:                error = sockopt_alloc(sopt, len, KM_NOSLEEP);
                   2084:                if (error)
                   2085:                        return error;
                   2086:        }
1.171     plunky   2087:
                   2088:        KASSERT(sopt->sopt_size == len);
                   2089:        memcpy(sopt->sopt_data, buf, len);
                   2090:        return 0;
                   2091: }
                   2092:
                   2093: /*
                   2094:  * common case of set sockopt integer value
                   2095:  */
                   2096: int
                   2097: sockopt_setint(struct sockopt *sopt, int val)
                   2098: {
                   2099:
                   2100:        return sockopt_set(sopt, &val, sizeof(int));
                   2101: }
                   2102:
                   2103: /*
                   2104:  * get sockopt value
                   2105:  *     - correct size must be given
                   2106:  */
                   2107: int
                   2108: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
                   2109: {
1.170     tls      2110:
1.171     plunky   2111:        if (sopt->sopt_size != len)
                   2112:                return EINVAL;
1.1       cgd      2113:
1.171     plunky   2114:        memcpy(buf, sopt->sopt_data, len);
                   2115:        return 0;
                   2116: }
1.1       cgd      2117:
1.171     plunky   2118: /*
                   2119:  * common case of get sockopt integer value
                   2120:  */
                   2121: int
                   2122: sockopt_getint(const struct sockopt *sopt, int *valp)
                   2123: {
1.1       cgd      2124:
1.171     plunky   2125:        return sockopt_get(sopt, valp, sizeof(int));
                   2126: }
1.1       cgd      2127:
1.171     plunky   2128: /*
                   2129:  * set sockopt value from mbuf
                   2130:  *     - ONLY for legacy code
                   2131:  *     - mbuf is released by sockopt
1.176     plunky   2132:  *     - will not sleep
1.171     plunky   2133:  */
                   2134: int
                   2135: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
                   2136: {
                   2137:        size_t len;
1.176     plunky   2138:        int error;
1.1       cgd      2139:
1.171     plunky   2140:        len = m_length(m);
1.1       cgd      2141:
1.176     plunky   2142:        if (sopt->sopt_size == 0) {
                   2143:                error = sockopt_alloc(sopt, len, KM_NOSLEEP);
                   2144:                if (error)
                   2145:                        return error;
                   2146:        }
1.1       cgd      2147:
1.171     plunky   2148:        KASSERT(sopt->sopt_size == len);
                   2149:        m_copydata(m, 0, len, sopt->sopt_data);
                   2150:        m_freem(m);
1.1       cgd      2151:
1.171     plunky   2152:        return 0;
                   2153: }
1.1       cgd      2154:
1.171     plunky   2155: /*
                   2156:  * get sockopt value into mbuf
                   2157:  *     - ONLY for legacy code
                   2158:  *     - mbuf to be released by the caller
1.176     plunky   2159:  *     - will not sleep
1.171     plunky   2160:  */
                   2161: struct mbuf *
                   2162: sockopt_getmbuf(const struct sockopt *sopt)
                   2163: {
                   2164:        struct mbuf *m;
1.107     darrenr  2165:
1.176     plunky   2166:        if (sopt->sopt_size > MCLBYTES)
                   2167:                return NULL;
                   2168:
                   2169:        m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171     plunky   2170:        if (m == NULL)
                   2171:                return NULL;
                   2172:
1.176     plunky   2173:        if (sopt->sopt_size > MLEN) {
                   2174:                MCLGET(m, M_DONTWAIT);
                   2175:                if ((m->m_flags & M_EXT) == 0) {
                   2176:                        m_free(m);
                   2177:                        return NULL;
                   2178:                }
1.1       cgd      2179:        }
1.176     plunky   2180:
                   2181:        memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
                   2182:        m->m_len = sopt->sopt_size;
1.160     ad       2183:
1.171     plunky   2184:        return m;
1.1       cgd      2185: }
                   2186:
1.14      mycroft  2187: void
1.54      lukem    2188: sohasoutofband(struct socket *so)
1.1       cgd      2189: {
1.153     rmind    2190:
1.90      christos 2191:        fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189     ad       2192:        selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1       cgd      2193: }
1.72      jdolecek 2194:
                   2195: static void
                   2196: filt_sordetach(struct knote *kn)
                   2197: {
                   2198:        struct socket   *so;
                   2199:
1.155     ad       2200:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2201:        solock(so);
1.73      christos 2202:        SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
                   2203:        if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72      jdolecek 2204:                so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160     ad       2205:        sounlock(so);
1.72      jdolecek 2206: }
                   2207:
                   2208: /*ARGSUSED*/
                   2209: static int
1.129     yamt     2210: filt_soread(struct knote *kn, long hint)
1.72      jdolecek 2211: {
                   2212:        struct socket   *so;
1.160     ad       2213:        int rv;
1.72      jdolecek 2214:
1.155     ad       2215:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2216:        if (hint != NOTE_SUBMIT)
                   2217:                solock(so);
1.72      jdolecek 2218:        kn->kn_data = so->so_rcv.sb_cc;
                   2219:        if (so->so_state & SS_CANTRCVMORE) {
1.108     perry    2220:                kn->kn_flags |= EV_EOF;
1.72      jdolecek 2221:                kn->kn_fflags = so->so_error;
1.160     ad       2222:                rv = 1;
                   2223:        } else if (so->so_error)        /* temporary udp error */
                   2224:                rv = 1;
                   2225:        else if (kn->kn_sfflags & NOTE_LOWAT)
                   2226:                rv = (kn->kn_data >= kn->kn_sdata);
                   2227:        else
                   2228:                rv = (kn->kn_data >= so->so_rcv.sb_lowat);
                   2229:        if (hint != NOTE_SUBMIT)
                   2230:                sounlock(so);
                   2231:        return rv;
1.72      jdolecek 2232: }
                   2233:
                   2234: static void
                   2235: filt_sowdetach(struct knote *kn)
                   2236: {
                   2237:        struct socket   *so;
                   2238:
1.155     ad       2239:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2240:        solock(so);
1.73      christos 2241:        SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
                   2242:        if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72      jdolecek 2243:                so->so_snd.sb_flags &= ~SB_KNOTE;
1.160     ad       2244:        sounlock(so);
1.72      jdolecek 2245: }
                   2246:
                   2247: /*ARGSUSED*/
                   2248: static int
1.129     yamt     2249: filt_sowrite(struct knote *kn, long hint)
1.72      jdolecek 2250: {
                   2251:        struct socket   *so;
1.160     ad       2252:        int rv;
1.72      jdolecek 2253:
1.155     ad       2254:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2255:        if (hint != NOTE_SUBMIT)
                   2256:                solock(so);
1.72      jdolecek 2257:        kn->kn_data = sbspace(&so->so_snd);
                   2258:        if (so->so_state & SS_CANTSENDMORE) {
1.108     perry    2259:                kn->kn_flags |= EV_EOF;
1.72      jdolecek 2260:                kn->kn_fflags = so->so_error;
1.160     ad       2261:                rv = 1;
                   2262:        } else if (so->so_error)        /* temporary udp error */
                   2263:                rv = 1;
                   2264:        else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72      jdolecek 2265:            (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160     ad       2266:                rv = 0;
                   2267:        else if (kn->kn_sfflags & NOTE_LOWAT)
                   2268:                rv = (kn->kn_data >= kn->kn_sdata);
                   2269:        else
                   2270:                rv = (kn->kn_data >= so->so_snd.sb_lowat);
                   2271:        if (hint != NOTE_SUBMIT)
                   2272:                sounlock(so);
                   2273:        return rv;
1.72      jdolecek 2274: }
                   2275:
                   2276: /*ARGSUSED*/
                   2277: static int
1.129     yamt     2278: filt_solisten(struct knote *kn, long hint)
1.72      jdolecek 2279: {
                   2280:        struct socket   *so;
1.160     ad       2281:        int rv;
1.72      jdolecek 2282:
1.155     ad       2283:        so = ((file_t *)kn->kn_obj)->f_data;
1.72      jdolecek 2284:
                   2285:        /*
                   2286:         * Set kn_data to number of incoming connections, not
                   2287:         * counting partial (incomplete) connections.
1.108     perry    2288:         */
1.160     ad       2289:        if (hint != NOTE_SUBMIT)
                   2290:                solock(so);
1.72      jdolecek 2291:        kn->kn_data = so->so_qlen;
1.160     ad       2292:        rv = (kn->kn_data > 0);
                   2293:        if (hint != NOTE_SUBMIT)
                   2294:                sounlock(so);
                   2295:        return rv;
1.72      jdolecek 2296: }
                   2297:
                   2298: static const struct filterops solisten_filtops =
                   2299:        { 1, NULL, filt_sordetach, filt_solisten };
                   2300: static const struct filterops soread_filtops =
                   2301:        { 1, NULL, filt_sordetach, filt_soread };
                   2302: static const struct filterops sowrite_filtops =
                   2303:        { 1, NULL, filt_sowdetach, filt_sowrite };
                   2304:
                   2305: int
1.129     yamt     2306: soo_kqfilter(struct file *fp, struct knote *kn)
1.72      jdolecek 2307: {
                   2308:        struct socket   *so;
                   2309:        struct sockbuf  *sb;
                   2310:
1.155     ad       2311:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2312:        solock(so);
1.72      jdolecek 2313:        switch (kn->kn_filter) {
                   2314:        case EVFILT_READ:
                   2315:                if (so->so_options & SO_ACCEPTCONN)
                   2316:                        kn->kn_fop = &solisten_filtops;
                   2317:                else
                   2318:                        kn->kn_fop = &soread_filtops;
                   2319:                sb = &so->so_rcv;
                   2320:                break;
                   2321:        case EVFILT_WRITE:
                   2322:                kn->kn_fop = &sowrite_filtops;
                   2323:                sb = &so->so_snd;
                   2324:                break;
                   2325:        default:
1.160     ad       2326:                sounlock(so);
1.149     pooka    2327:                return (EINVAL);
1.72      jdolecek 2328:        }
1.73      christos 2329:        SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72      jdolecek 2330:        sb->sb_flags |= SB_KNOTE;
1.160     ad       2331:        sounlock(so);
1.72      jdolecek 2332:        return (0);
                   2333: }
                   2334:
1.154     ad       2335: static int
                   2336: sodopoll(struct socket *so, int events)
                   2337: {
                   2338:        int revents;
                   2339:
                   2340:        revents = 0;
                   2341:
                   2342:        if (events & (POLLIN | POLLRDNORM))
                   2343:                if (soreadable(so))
                   2344:                        revents |= events & (POLLIN | POLLRDNORM);
                   2345:
                   2346:        if (events & (POLLOUT | POLLWRNORM))
                   2347:                if (sowritable(so))
                   2348:                        revents |= events & (POLLOUT | POLLWRNORM);
                   2349:
                   2350:        if (events & (POLLPRI | POLLRDBAND))
                   2351:                if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
                   2352:                        revents |= events & (POLLPRI | POLLRDBAND);
                   2353:
                   2354:        return revents;
                   2355: }
                   2356:
                   2357: int
                   2358: sopoll(struct socket *so, int events)
                   2359: {
                   2360:        int revents = 0;
                   2361:
1.160     ad       2362: #ifndef DIAGNOSTIC
                   2363:        /*
                   2364:         * Do a quick, unlocked check in expectation that the socket
                   2365:         * will be ready for I/O.  Don't do this check if DIAGNOSTIC,
                   2366:         * as the solocked() assertions will fail.
                   2367:         */
1.154     ad       2368:        if ((revents = sodopoll(so, events)) != 0)
                   2369:                return revents;
1.160     ad       2370: #endif
1.154     ad       2371:
1.160     ad       2372:        solock(so);
1.154     ad       2373:        if ((revents = sodopoll(so, events)) == 0) {
                   2374:                if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
                   2375:                        selrecord(curlwp, &so->so_rcv.sb_sel);
1.160     ad       2376:                        so->so_rcv.sb_flags |= SB_NOTIFY;
1.154     ad       2377:                }
                   2378:
                   2379:                if (events & (POLLOUT | POLLWRNORM)) {
                   2380:                        selrecord(curlwp, &so->so_snd.sb_sel);
1.160     ad       2381:                        so->so_snd.sb_flags |= SB_NOTIFY;
1.154     ad       2382:                }
                   2383:        }
1.160     ad       2384:        sounlock(so);
1.154     ad       2385:
                   2386:        return revents;
                   2387: }
                   2388:
                   2389:
1.94      yamt     2390: #include <sys/sysctl.h>
                   2391:
                   2392: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
                   2393:
                   2394: /*
                   2395:  * sysctl helper routine for kern.somaxkva.  ensures that the given
                   2396:  * value is not too small.
                   2397:  * (XXX should we maybe make sure it's not too large as well?)
                   2398:  */
                   2399: static int
                   2400: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
                   2401: {
                   2402:        int error, new_somaxkva;
                   2403:        struct sysctlnode node;
                   2404:
                   2405:        new_somaxkva = somaxkva;
                   2406:        node = *rnode;
                   2407:        node.sysctl_data = &new_somaxkva;
                   2408:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2409:        if (error || newp == NULL)
                   2410:                return (error);
                   2411:
                   2412:        if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
                   2413:                return (EINVAL);
                   2414:
1.136     ad       2415:        mutex_enter(&so_pendfree_lock);
1.94      yamt     2416:        somaxkva = new_somaxkva;
1.136     ad       2417:        cv_broadcast(&socurkva_cv);
                   2418:        mutex_exit(&so_pendfree_lock);
1.94      yamt     2419:
                   2420:        return (error);
                   2421: }
                   2422:
1.178     pooka    2423: static void
1.187     cegger   2424: sysctl_kern_somaxkva_setup(void)
1.94      yamt     2425: {
                   2426:
1.178     pooka    2427:        KASSERT(socket_sysctllog == NULL);
                   2428:        sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97      atatat   2429:                       CTLFLAG_PERMANENT,
                   2430:                       CTLTYPE_NODE, "kern", NULL,
                   2431:                       NULL, 0, NULL, 0,
                   2432:                       CTL_KERN, CTL_EOL);
                   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);
                   2441: }

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