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Annotation of src/sys/kern/uipc_socket.c, Revision 1.215.4.4

1.215.4.2  rmind       1: /*     $NetBSD$        */
1.64      thorpej     2:
                      3: /*-
1.188     ad          4:  * Copyright (c) 2002, 2007, 2008, 2009 The NetBSD Foundation, Inc.
1.64      thorpej     5:  * All rights reserved.
                      6:  *
                      7:  * This code is derived from software contributed to The NetBSD Foundation
1.188     ad          8:  * by Jason R. Thorpe of Wasabi Systems, Inc, and by Andrew Doran.
1.64      thorpej     9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     20:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     21:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     22:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     23:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     24:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     25:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     26:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     27:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     28:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     29:  * POSSIBILITY OF SUCH DAMAGE.
                     30:  */
1.16      cgd        31:
1.1       cgd        32: /*
1.159     ad         33:  * Copyright (c) 2004 The FreeBSD Foundation
                     34:  * Copyright (c) 2004 Robert Watson
1.15      mycroft    35:  * Copyright (c) 1982, 1986, 1988, 1990, 1993
                     36:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        37:  *
                     38:  * Redistribution and use in source and binary forms, with or without
                     39:  * modification, are permitted provided that the following conditions
                     40:  * are met:
                     41:  * 1. Redistributions of source code must retain the above copyright
                     42:  *    notice, this list of conditions and the following disclaimer.
                     43:  * 2. Redistributions in binary form must reproduce the above copyright
                     44:  *    notice, this list of conditions and the following disclaimer in the
                     45:  *    documentation and/or other materials provided with the distribution.
1.85      agc        46:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        47:  *    may be used to endorse or promote products derived from this software
                     48:  *    without specific prior written permission.
                     49:  *
                     50:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     51:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     52:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     53:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     54:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     55:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     56:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     57:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     58:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     59:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     60:  * SUCH DAMAGE.
                     61:  *
1.32      fvdl       62:  *     @(#)uipc_socket.c       8.6 (Berkeley) 5/2/95
1.1       cgd        63:  */
1.59      lukem      64:
1.215.4.1  rmind      65: /*
                     66:  * Socket operation routines.
                     67:  *
                     68:  * These routines are called by the routines in sys_socket.c or from a
                     69:  * system process, and implement the semantics of socket operations by
                     70:  * switching out to the protocol specific routines.
                     71:  */
                     72:
1.59      lukem      73: #include <sys/cdefs.h>
1.215.4.2  rmind      74: __KERNEL_RCSID(0, "$NetBSD$");
1.64      thorpej    75:
1.179     christos   76: #include "opt_compat_netbsd.h"
1.64      thorpej    77: #include "opt_sock_counters.h"
                     78: #include "opt_sosend_loan.h"
1.81      martin     79: #include "opt_mbuftrace.h"
1.84      ragge      80: #include "opt_somaxkva.h"
1.167     ad         81: #include "opt_multiprocessor.h"        /* XXX */
1.1       cgd        82:
1.9       mycroft    83: #include <sys/param.h>
                     84: #include <sys/systm.h>
                     85: #include <sys/proc.h>
                     86: #include <sys/file.h>
1.142     dyoung     87: #include <sys/filedesc.h>
1.173     plunky     88: #include <sys/kmem.h>
1.9       mycroft    89: #include <sys/mbuf.h>
                     90: #include <sys/domain.h>
                     91: #include <sys/kernel.h>
                     92: #include <sys/protosw.h>
                     93: #include <sys/socket.h>
                     94: #include <sys/socketvar.h>
1.21      christos   95: #include <sys/signalvar.h>
1.9       mycroft    96: #include <sys/resourcevar.h>
1.174     pooka      97: #include <sys/uidinfo.h>
1.72      jdolecek   98: #include <sys/event.h>
1.89      christos   99: #include <sys/poll.h>
1.118     elad      100: #include <sys/kauth.h>
1.136     ad        101: #include <sys/mutex.h>
                    102: #include <sys/condvar.h>
1.205     bouyer    103: #include <sys/kthread.h>
1.37      thorpej   104:
1.179     christos  105: #ifdef COMPAT_50
                    106: #include <compat/sys/time.h>
1.184     christos  107: #include <compat/sys/socket.h>
1.179     christos  108: #endif
                    109:
1.202     uebayasi  110: #include <uvm/uvm_extern.h>
                    111: #include <uvm/uvm_loan.h>
                    112: #include <uvm/uvm_page.h>
1.64      thorpej   113:
1.77      thorpej   114: MALLOC_DEFINE(M_SONAME, "soname", "socket name");
1.37      thorpej   115:
1.142     dyoung    116: extern const struct fileops socketops;
                    117:
1.54      lukem     118: extern int     somaxconn;                      /* patchable (XXX sysctl) */
                    119: int            somaxconn = SOMAXCONN;
1.160     ad        120: kmutex_t       *softnet_lock;
1.49      jonathan  121:
1.64      thorpej   122: #ifdef SOSEND_COUNTERS
                    123: #include <sys/device.h>
                    124:
1.113     thorpej   125: static struct evcnt sosend_loan_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   126:     NULL, "sosend", "loan big");
1.113     thorpej   127: static struct evcnt sosend_copy_big = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   128:     NULL, "sosend", "copy big");
1.113     thorpej   129: static struct evcnt sosend_copy_small = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   130:     NULL, "sosend", "copy small");
1.113     thorpej   131: static struct evcnt sosend_kvalimit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
1.64      thorpej   132:     NULL, "sosend", "kva limit");
                    133:
                    134: #define        SOSEND_COUNTER_INCR(ev)         (ev)->ev_count++
                    135:
1.101     matt      136: EVCNT_ATTACH_STATIC(sosend_loan_big);
                    137: EVCNT_ATTACH_STATIC(sosend_copy_big);
                    138: EVCNT_ATTACH_STATIC(sosend_copy_small);
                    139: EVCNT_ATTACH_STATIC(sosend_kvalimit);
1.64      thorpej   140: #else
                    141:
                    142: #define        SOSEND_COUNTER_INCR(ev)         /* nothing */
                    143:
                    144: #endif /* SOSEND_COUNTERS */
                    145:
1.167     ad        146: #if defined(SOSEND_NO_LOAN) || defined(MULTIPROCESSOR)
1.121     yamt      147: int sock_loan_thresh = -1;
1.71      thorpej   148: #else
1.121     yamt      149: int sock_loan_thresh = 4096;
1.65      thorpej   150: #endif
1.64      thorpej   151:
1.136     ad        152: static kmutex_t so_pendfree_lock;
1.205     bouyer    153: static struct mbuf *so_pendfree = NULL;
1.64      thorpej   154:
1.84      ragge     155: #ifndef SOMAXKVA
                    156: #define        SOMAXKVA (16 * 1024 * 1024)
                    157: #endif
                    158: int somaxkva = SOMAXKVA;
1.113     thorpej   159: static int socurkva;
1.136     ad        160: static kcondvar_t socurkva_cv;
1.64      thorpej   161:
1.191     elad      162: static kauth_listener_t socket_listener;
                    163:
1.64      thorpej   164: #define        SOCK_LOAN_CHUNK         65536
                    165:
1.205     bouyer    166: static void sopendfree_thread(void *);
                    167: static kcondvar_t pendfree_thread_cv;
                    168: static lwp_t *sopendfree_lwp;
1.93      yamt      169:
1.212     pooka     170: static void sysctl_kern_socket_setup(void);
1.178     pooka     171: static struct sysctllog *socket_sysctllog;
                    172:
1.113     thorpej   173: static vsize_t
1.129     yamt      174: sokvareserve(struct socket *so, vsize_t len)
1.80      yamt      175: {
1.98      christos  176:        int error;
1.80      yamt      177:
1.136     ad        178:        mutex_enter(&so_pendfree_lock);
1.80      yamt      179:        while (socurkva + len > somaxkva) {
                    180:                SOSEND_COUNTER_INCR(&sosend_kvalimit);
1.136     ad        181:                error = cv_wait_sig(&socurkva_cv, &so_pendfree_lock);
1.98      christos  182:                if (error) {
                    183:                        len = 0;
                    184:                        break;
                    185:                }
1.80      yamt      186:        }
1.93      yamt      187:        socurkva += len;
1.136     ad        188:        mutex_exit(&so_pendfree_lock);
1.98      christos  189:        return len;
1.95      yamt      190: }
                    191:
1.113     thorpej   192: static void
1.95      yamt      193: sokvaunreserve(vsize_t len)
                    194: {
                    195:
1.136     ad        196:        mutex_enter(&so_pendfree_lock);
1.95      yamt      197:        socurkva -= len;
1.136     ad        198:        cv_broadcast(&socurkva_cv);
                    199:        mutex_exit(&so_pendfree_lock);
1.95      yamt      200: }
                    201:
                    202: /*
                    203:  * sokvaalloc: allocate kva for loan.
                    204:  */
                    205:
                    206: vaddr_t
1.209     matt      207: sokvaalloc(vaddr_t sva, vsize_t len, struct socket *so)
1.95      yamt      208: {
                    209:        vaddr_t lva;
                    210:
                    211:        /*
                    212:         * reserve kva.
                    213:         */
                    214:
1.98      christos  215:        if (sokvareserve(so, len) == 0)
                    216:                return 0;
1.93      yamt      217:
                    218:        /*
                    219:         * allocate kva.
                    220:         */
1.80      yamt      221:
1.209     matt      222:        lva = uvm_km_alloc(kernel_map, len, atop(sva) & uvmexp.colormask,
                    223:            UVM_KMF_COLORMATCH | UVM_KMF_VAONLY | UVM_KMF_WAITVA);
1.95      yamt      224:        if (lva == 0) {
                    225:                sokvaunreserve(len);
1.80      yamt      226:                return (0);
1.95      yamt      227:        }
1.80      yamt      228:
                    229:        return lva;
                    230: }
                    231:
1.93      yamt      232: /*
                    233:  * sokvafree: free kva for loan.
                    234:  */
                    235:
1.80      yamt      236: void
                    237: sokvafree(vaddr_t sva, vsize_t len)
                    238: {
1.93      yamt      239:
                    240:        /*
                    241:         * free kva.
                    242:         */
1.80      yamt      243:
1.109     yamt      244:        uvm_km_free(kernel_map, sva, len, UVM_KMF_VAONLY);
1.93      yamt      245:
                    246:        /*
                    247:         * unreserve kva.
                    248:         */
                    249:
1.95      yamt      250:        sokvaunreserve(len);
1.80      yamt      251: }
                    252:
1.64      thorpej   253: static void
1.134     christos  254: sodoloanfree(struct vm_page **pgs, void *buf, size_t size)
1.64      thorpej   255: {
1.156     yamt      256:        vaddr_t sva, eva;
1.64      thorpej   257:        vsize_t len;
1.156     yamt      258:        int npgs;
                    259:
                    260:        KASSERT(pgs != NULL);
1.64      thorpej   261:
                    262:        eva = round_page((vaddr_t) buf + size);
                    263:        sva = trunc_page((vaddr_t) buf);
                    264:        len = eva - sva;
                    265:        npgs = len >> PAGE_SHIFT;
                    266:
                    267:        pmap_kremove(sva, len);
                    268:        pmap_update(pmap_kernel());
                    269:        uvm_unloan(pgs, npgs, UVM_LOAN_TOPAGE);
1.80      yamt      270:        sokvafree(sva, len);
1.64      thorpej   271: }
                    272:
1.93      yamt      273: /*
1.205     bouyer    274:  * sopendfree_thread: free mbufs on "pendfree" list.
1.136     ad        275:  * unlock and relock so_pendfree_lock when freeing mbufs.
1.93      yamt      276:  */
                    277:
1.205     bouyer    278: static void
                    279: sopendfree_thread(void *v)
1.93      yamt      280: {
1.137     ad        281:        struct mbuf *m, *next;
1.205     bouyer    282:        size_t rv;
1.93      yamt      283:
1.205     bouyer    284:        mutex_enter(&so_pendfree_lock);
1.64      thorpej   285:
1.205     bouyer    286:        for (;;) {
                    287:                rv = 0;
                    288:                while (so_pendfree != NULL) {
                    289:                        m = so_pendfree;
                    290:                        so_pendfree = NULL;
                    291:                        mutex_exit(&so_pendfree_lock);
                    292:
                    293:                        for (; m != NULL; m = next) {
                    294:                                next = m->m_next;
                    295:                                KASSERT((~m->m_flags & (M_EXT|M_EXT_PAGES)) == 0);
                    296:                                KASSERT(m->m_ext.ext_refcnt == 0);
                    297:
                    298:                                rv += m->m_ext.ext_size;
                    299:                                sodoloanfree(m->m_ext.ext_pgs, m->m_ext.ext_buf,
                    300:                                    m->m_ext.ext_size);
                    301:                                pool_cache_put(mb_cache, m);
                    302:                        }
1.93      yamt      303:
1.205     bouyer    304:                        mutex_enter(&so_pendfree_lock);
1.93      yamt      305:                }
1.205     bouyer    306:                if (rv)
                    307:                        cv_broadcast(&socurkva_cv);
                    308:                cv_wait(&pendfree_thread_cv, &so_pendfree_lock);
1.64      thorpej   309:        }
1.205     bouyer    310:        panic("sopendfree_thread");
                    311:        /* NOTREACHED */
1.64      thorpej   312: }
                    313:
1.80      yamt      314: void
1.134     christos  315: soloanfree(struct mbuf *m, void *buf, size_t size, void *arg)
1.64      thorpej   316: {
                    317:
1.156     yamt      318:        KASSERT(m != NULL);
1.64      thorpej   319:
1.93      yamt      320:        /*
                    321:         * postpone freeing mbuf.
                    322:         *
                    323:         * we can't do it in interrupt context
                    324:         * because we need to put kva back to kernel_map.
                    325:         */
                    326:
1.136     ad        327:        mutex_enter(&so_pendfree_lock);
1.92      yamt      328:        m->m_next = so_pendfree;
                    329:        so_pendfree = m;
1.205     bouyer    330:        cv_signal(&pendfree_thread_cv);
1.136     ad        331:        mutex_exit(&so_pendfree_lock);
1.64      thorpej   332: }
                    333:
                    334: static long
                    335: sosend_loan(struct socket *so, struct uio *uio, struct mbuf *m, long space)
                    336: {
                    337:        struct iovec *iov = uio->uio_iov;
                    338:        vaddr_t sva, eva;
                    339:        vsize_t len;
1.156     yamt      340:        vaddr_t lva;
                    341:        int npgs, error;
                    342:        vaddr_t va;
                    343:        int i;
1.64      thorpej   344:
1.116     yamt      345:        if (VMSPACE_IS_KERNEL_P(uio->uio_vmspace))
1.64      thorpej   346:                return (0);
                    347:
                    348:        if (iov->iov_len < (size_t) space)
                    349:                space = iov->iov_len;
                    350:        if (space > SOCK_LOAN_CHUNK)
                    351:                space = SOCK_LOAN_CHUNK;
                    352:
                    353:        eva = round_page((vaddr_t) iov->iov_base + space);
                    354:        sva = trunc_page((vaddr_t) iov->iov_base);
                    355:        len = eva - sva;
                    356:        npgs = len >> PAGE_SHIFT;
                    357:
1.79      thorpej   358:        KASSERT(npgs <= M_EXT_MAXPAGES);
                    359:
1.209     matt      360:        lva = sokvaalloc(sva, len, so);
1.64      thorpej   361:        if (lva == 0)
1.80      yamt      362:                return 0;
1.64      thorpej   363:
1.116     yamt      364:        error = uvm_loan(&uio->uio_vmspace->vm_map, sva, len,
1.79      thorpej   365:            m->m_ext.ext_pgs, UVM_LOAN_TOPAGE);
1.64      thorpej   366:        if (error) {
1.80      yamt      367:                sokvafree(lva, len);
1.64      thorpej   368:                return (0);
                    369:        }
                    370:
                    371:        for (i = 0, va = lva; i < npgs; i++, va += PAGE_SIZE)
1.79      thorpej   372:                pmap_kenter_pa(va, VM_PAGE_TO_PHYS(m->m_ext.ext_pgs[i]),
1.194     cegger    373:                    VM_PROT_READ, 0);
1.64      thorpej   374:        pmap_update(pmap_kernel());
                    375:
                    376:        lva += (vaddr_t) iov->iov_base & PAGE_MASK;
                    377:
1.134     christos  378:        MEXTADD(m, (void *) lva, space, M_MBUF, soloanfree, so);
1.79      thorpej   379:        m->m_flags |= M_EXT_PAGES | M_EXT_ROMAP;
1.64      thorpej   380:
                    381:        uio->uio_resid -= space;
                    382:        /* uio_offset not updated, not set/used for write(2) */
1.134     christos  383:        uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + space;
1.64      thorpej   384:        uio->uio_iov->iov_len -= space;
                    385:        if (uio->uio_iov->iov_len == 0) {
                    386:                uio->uio_iov++;
                    387:                uio->uio_iovcnt--;
                    388:        }
                    389:
                    390:        return (space);
                    391: }
                    392:
1.142     dyoung    393: struct mbuf *
1.147     dyoung    394: getsombuf(struct socket *so, int type)
1.142     dyoung    395: {
                    396:        struct mbuf *m;
                    397:
1.147     dyoung    398:        m = m_get(M_WAIT, type);
1.142     dyoung    399:        MCLAIM(m, so->so_mowner);
                    400:        return m;
                    401: }
                    402:
1.191     elad      403: static int
                    404: socket_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
                    405:     void *arg0, void *arg1, void *arg2, void *arg3)
                    406: {
                    407:        int result;
                    408:        enum kauth_network_req req;
                    409:
                    410:        result = KAUTH_RESULT_DEFER;
                    411:        req = (enum kauth_network_req)arg0;
                    412:
1.193     elad      413:        if ((action != KAUTH_NETWORK_SOCKET) &&
                    414:            (action != KAUTH_NETWORK_BIND))
1.191     elad      415:                return result;
                    416:
                    417:        switch (req) {
1.193     elad      418:        case KAUTH_REQ_NETWORK_BIND_PORT:
                    419:                result = KAUTH_RESULT_ALLOW;
                    420:                break;
                    421:
1.191     elad      422:        case KAUTH_REQ_NETWORK_SOCKET_DROP: {
                    423:                /* Normal users can only drop their own connections. */
                    424:                struct socket *so = (struct socket *)arg1;
                    425:
1.215.4.4! rmind     426:                if (so->so_cred && proc_uidmatch(cred, so->so_cred) == 0)
1.191     elad      427:                        result = KAUTH_RESULT_ALLOW;
                    428:
                    429:                break;
                    430:                }
                    431:
                    432:        case KAUTH_REQ_NETWORK_SOCKET_OPEN:
                    433:                /* We allow "raw" routing/bluetooth sockets to anyone. */
1.203     matt      434:                if ((u_long)arg1 == PF_ROUTE || (u_long)arg1 == PF_OROUTE
                    435:                    || (u_long)arg1 == PF_BLUETOOTH) {
1.191     elad      436:                        result = KAUTH_RESULT_ALLOW;
1.203     matt      437:                } else {
1.191     elad      438:                        /* Privileged, let secmodel handle this. */
                    439:                        if ((u_long)arg2 == SOCK_RAW)
                    440:                                break;
                    441:                }
                    442:
                    443:                result = KAUTH_RESULT_ALLOW;
                    444:
                    445:                break;
                    446:
1.192     elad      447:        case KAUTH_REQ_NETWORK_SOCKET_CANSEE:
                    448:                result = KAUTH_RESULT_ALLOW;
                    449:
                    450:                break;
                    451:
1.191     elad      452:        default:
                    453:                break;
                    454:        }
                    455:
                    456:        return result;
                    457: }
                    458:
1.119     yamt      459: void
                    460: soinit(void)
                    461: {
                    462:
1.212     pooka     463:        sysctl_kern_socket_setup();
1.178     pooka     464:
1.148     ad        465:        mutex_init(&so_pendfree_lock, MUTEX_DEFAULT, IPL_VM);
1.160     ad        466:        softnet_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
1.136     ad        467:        cv_init(&socurkva_cv, "sokva");
1.205     bouyer    468:        cv_init(&pendfree_thread_cv, "sopendfr");
1.166     ad        469:        soinit2();
1.136     ad        470:
1.119     yamt      471:        /* Set the initial adjusted socket buffer size. */
                    472:        if (sb_max_set(sb_max))
                    473:                panic("bad initial sb_max value: %lu", sb_max);
                    474:
1.191     elad      475:        socket_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
                    476:            socket_listener_cb, NULL);
1.119     yamt      477: }
                    478:
1.205     bouyer    479: void
                    480: soinit1(void)
                    481: {
                    482:        int error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL,
                    483:            sopendfree_thread, NULL, &sopendfree_lwp, "sopendfree");
                    484:        if (error)
                    485:                panic("soinit1 %d", error);
                    486: }
                    487:
1.1       cgd       488: /*
1.215.4.1  rmind     489:  * socreate: create a new socket of the specified type and the protocol.
                    490:  *
                    491:  * => Caller may specify another socket for lock sharing (must not be held).
                    492:  * => Returns the new socket without lock held.
1.1       cgd       493:  */
1.3       andrew    494: int
1.160     ad        495: socreate(int dom, struct socket **aso, int type, int proto, struct lwp *l,
                    496:         struct socket *lockso)
1.1       cgd       497: {
1.99      matt      498:        const struct protosw    *prp;
1.54      lukem     499:        struct socket   *so;
1.115     yamt      500:        uid_t           uid;
1.160     ad        501:        int             error;
                    502:        kmutex_t        *lock;
1.1       cgd       503:
1.132     elad      504:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_SOCKET,
                    505:            KAUTH_REQ_NETWORK_SOCKET_OPEN, KAUTH_ARG(dom), KAUTH_ARG(type),
                    506:            KAUTH_ARG(proto));
1.140     dyoung    507:        if (error != 0)
                    508:                return error;
1.127     elad      509:
1.1       cgd       510:        if (proto)
                    511:                prp = pffindproto(dom, proto, type);
                    512:        else
                    513:                prp = pffindtype(dom, type);
1.140     dyoung    514:        if (prp == NULL) {
1.120     ginsbach  515:                /* no support for domain */
                    516:                if (pffinddomain(dom) == 0)
1.140     dyoung    517:                        return EAFNOSUPPORT;
1.120     ginsbach  518:                /* no support for socket type */
                    519:                if (proto == 0 && type != 0)
1.140     dyoung    520:                        return EPROTOTYPE;
                    521:                return EPROTONOSUPPORT;
1.120     ginsbach  522:        }
1.215.4.1  rmind     523:        if (prp->pr_usrreqs == NULL)
1.140     dyoung    524:                return EPROTONOSUPPORT;
1.1       cgd       525:        if (prp->pr_type != type)
1.140     dyoung    526:                return EPROTOTYPE;
1.160     ad        527:
                    528:        so = soget(true);
1.1       cgd       529:        so->so_type = type;
                    530:        so->so_proto = prp;
1.215.4.3  rmind     531:        so->so_refcnt = 1;
                    532:
1.33      matt      533:        so->so_send = sosend;
                    534:        so->so_receive = soreceive;
1.78      matt      535: #ifdef MBUFTRACE
                    536:        so->so_rcv.sb_mowner = &prp->pr_domain->dom_mowner;
                    537:        so->so_snd.sb_mowner = &prp->pr_domain->dom_mowner;
                    538:        so->so_mowner = &prp->pr_domain->dom_mowner;
                    539: #endif
1.138     rmind     540:        uid = kauth_cred_geteuid(l->l_cred);
1.115     yamt      541:        so->so_uidinfo = uid_find(uid);
1.168     yamt      542:        so->so_cpid = l->l_proc->p_pid;
1.215.4.1  rmind     543:
                    544:        /*
                    545:         * Lock assigned and taken during pr_attach, unless we share
                    546:         * the lock with another socket, e.g. socketpair(2) case.
                    547:         */
                    548:        if (lockso) {
1.160     ad        549:                lock = lockso->so_lock;
                    550:                so->so_lock = lock;
                    551:                mutex_obj_hold(lock);
                    552:        }
1.215.4.1  rmind     553:
                    554:        error = (*prp->pr_usrreqs->pr_attach)(so, proto);
                    555:        if (error) {
                    556:                solock(so);
                    557:                KASSERT(so->so_pcb == NULL);
1.1       cgd       558:                so->so_state |= SS_NOFDREF;
                    559:                sofree(so);
1.140     dyoung    560:                return error;
1.1       cgd       561:        }
1.198     elad      562:        so->so_cred = kauth_cred_dup(l->l_cred);
1.215.4.1  rmind     563:
1.1       cgd       564:        *aso = so;
1.140     dyoung    565:        return 0;
1.1       cgd       566: }
                    567:
1.215.4.1  rmind     568: /*
                    569:  * fsocreate: create a socket and a file descriptor associated with it.
                    570:  *
                    571:  * => On success, write file descriptor to fdout and return zero.
                    572:  * => On failure, return non-zero; *fdout will be undefined.
1.142     dyoung    573:  */
                    574: int
1.215.4.4! rmind     575: fsocreate(int domain, struct socket **sop, int type, int proto, int *fdout)
1.142     dyoung    576: {
1.215.4.1  rmind     577:        lwp_t *l = curlwp;
                    578:        int error, fd, flags;
                    579:        struct socket *so;
                    580:        struct file *fp;
1.142     dyoung    581:
1.215.4.1  rmind     582:        if ((error = fd_allocfile(&fp, &fd)) != 0) {
1.204     christos  583:                return error;
1.215.4.1  rmind     584:        }
                    585:        flags = type & SOCK_FLAGS_MASK;
1.204     christos  586:        fd_set_exclose(l, fd, (flags & SOCK_CLOEXEC) != 0);
1.207     christos  587:        fp->f_flag = FREAD|FWRITE|((flags & SOCK_NONBLOCK) ? FNONBLOCK : 0)|
                    588:            ((flags & SOCK_NOSIGPIPE) ? FNOSIGPIPE : 0);
1.142     dyoung    589:        fp->f_type = DTYPE_SOCKET;
                    590:        fp->f_ops = &socketops;
1.215.4.1  rmind     591:
                    592:        type &= ~SOCK_FLAGS_MASK;
1.215.4.4! rmind     593:        error = socreate(domain, &so, type, proto, l, NULL);
        !           594:        if (error) {
1.155     ad        595:                fd_abort(curproc, fp, fd);
1.215.4.1  rmind     596:                return error;
1.142     dyoung    597:        }
1.215.4.1  rmind     598:        if (flags & SOCK_NONBLOCK) {
                    599:                so->so_state |= SS_NBIO;
                    600:        }
                    601:        fp->f_data = so;
                    602:        fd_affix(curproc, fp, fd);
1.215.4.4! rmind     603:
1.215.4.1  rmind     604:        if (sop != NULL) {
                    605:                *sop = so;
                    606:        }
                    607:        *fdout = fd;
1.142     dyoung    608:        return error;
                    609: }
                    610:
1.215.4.3  rmind     611: void
                    612: soref(struct socket *so)
                    613: {
                    614:        atomic_inc_uint(&so->so_refcnt);
                    615: }
                    616:
                    617: void
                    618: sounref(struct socket *so)
                    619: {
                    620:        if (atomic_dec_uint_nv(&so->so_refcnt) > 0) {
                    621:                return;
                    622:        }
                    623:        soput(so);
                    624: }
                    625:
1.3       andrew    626: int
1.190     dyoung    627: sofamily(const struct socket *so)
                    628: {
                    629:        const struct protosw *pr;
                    630:        const struct domain *dom;
                    631:
                    632:        if ((pr = so->so_proto) == NULL)
                    633:                return AF_UNSPEC;
                    634:        if ((dom = pr->pr_domain) == NULL)
                    635:                return AF_UNSPEC;
                    636:        return dom->dom_family;
                    637: }
                    638:
                    639: int
1.114     christos  640: sobind(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1       cgd       641: {
1.215.4.1  rmind     642:        int error;
1.1       cgd       643:
1.160     ad        644:        solock(so);
1.215.4.1  rmind     645:        error = (*so->so_proto->pr_usrreqs->pr_generic)(so,
                    646:            PRU_BIND, NULL, nam, NULL, l);
1.160     ad        647:        sounlock(so);
1.140     dyoung    648:        return error;
1.1       cgd       649: }
                    650:
1.3       andrew    651: int
1.150     elad      652: solisten(struct socket *so, int backlog, struct lwp *l)
1.1       cgd       653: {
1.215.4.1  rmind     654:        int error;
1.1       cgd       655:
1.160     ad        656:        solock(so);
1.158     ad        657:        if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163     ad        658:            SS_ISDISCONNECTING)) != 0) {
1.215.4.1  rmind     659:                sounlock(so);
1.215.4.4! rmind     660:                return EINVAL;
1.163     ad        661:        }
1.215.4.4! rmind     662:        error = (*so->so_proto->pr_usrreqs->pr_generic)(so,
        !           663:            PRU_LISTEN, NULL, NULL, NULL, l);
1.140     dyoung    664:        if (error != 0) {
1.160     ad        665:                sounlock(so);
1.140     dyoung    666:                return error;
1.1       cgd       667:        }
1.63      matt      668:        if (TAILQ_EMPTY(&so->so_q))
1.1       cgd       669:                so->so_options |= SO_ACCEPTCONN;
                    670:        if (backlog < 0)
                    671:                backlog = 0;
1.49      jonathan  672:        so->so_qlimit = min(backlog, somaxconn);
1.160     ad        673:        sounlock(so);
1.140     dyoung    674:        return 0;
1.1       cgd       675: }
                    676:
1.21      christos  677: void
1.54      lukem     678: sofree(struct socket *so)
1.1       cgd       679: {
                    680:
1.160     ad        681:        KASSERT(solocked(so));
                    682:
                    683:        if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
                    684:                sounlock(so);
1.1       cgd       685:                return;
1.160     ad        686:        }
1.43      mycroft   687:        if (so->so_head) {
                    688:                /*
                    689:                 * We must not decommission a socket that's on the accept(2)
                    690:                 * queue.  If we do, then accept(2) may hang after select(2)
                    691:                 * indicated that the listening socket was ready.
                    692:                 */
1.160     ad        693:                if (!soqremque(so, 0)) {
                    694:                        sounlock(so);
1.43      mycroft   695:                        return;
1.160     ad        696:                }
1.43      mycroft   697:        }
1.98      christos  698:        if (so->so_rcv.sb_hiwat)
1.110     christos  699:                (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98      christos  700:                    RLIM_INFINITY);
                    701:        if (so->so_snd.sb_hiwat)
1.110     christos  702:                (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98      christos  703:                    RLIM_INFINITY);
                    704:        sbrelease(&so->so_snd, so);
1.160     ad        705:        KASSERT(!cv_has_waiters(&so->so_cv));
                    706:        KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
                    707:        KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1       cgd       708:        sorflush(so);
1.177     ad        709:        /* Remove acccept filter if one is present. */
1.170     tls       710:        if (so->so_accf != NULL)
1.177     ad        711:                (void)accept_filt_clear(so);
1.160     ad        712:        sounlock(so);
1.215.4.3  rmind     713:
                    714:        /* Will soput() if the last reference. */
                    715:        sounref(so);
1.1       cgd       716: }
                    717:
                    718: /*
1.215.4.1  rmind     719:  * soclose: close a socket on last file table reference removal.
                    720:  * Initiate disconnect if connected.  Free socket when disconnect complete.
1.1       cgd       721:  */
1.3       andrew    722: int
1.54      lukem     723: soclose(struct socket *so)
1.1       cgd       724: {
1.215.4.1  rmind     725:        struct socket *so2;
1.215.4.4! rmind     726:        int error = 0;
1.1       cgd       727:
1.160     ad        728:        solock(so);
1.1       cgd       729:        if (so->so_options & SO_ACCEPTCONN) {
1.172     ad        730:                for (;;) {
                    731:                        if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.160     ad        732:                                KASSERT(solocked2(so, so2));
                    733:                                (void) soqremque(so2, 0);
                    734:                                /* soabort drops the lock. */
                    735:                                (void) soabort(so2);
                    736:                                solock(so);
1.172     ad        737:                                continue;
1.160     ad        738:                        }
1.172     ad        739:                        if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.160     ad        740:                                KASSERT(solocked2(so, so2));
                    741:                                (void) soqremque(so2, 1);
                    742:                                /* soabort drops the lock. */
                    743:                                (void) soabort(so2);
                    744:                                solock(so);
1.172     ad        745:                                continue;
1.160     ad        746:                        }
1.172     ad        747:                        break;
                    748:                }
1.1       cgd       749:        }
1.215.4.1  rmind     750:        if (so->so_pcb == NULL)
1.1       cgd       751:                goto discard;
                    752:        if (so->so_state & SS_ISCONNECTED) {
                    753:                if ((so->so_state & SS_ISDISCONNECTING) == 0) {
                    754:                        error = sodisconnect(so);
                    755:                        if (error)
                    756:                                goto drop;
                    757:                }
                    758:                if (so->so_options & SO_LINGER) {
1.206     christos  759:                        if ((so->so_state & (SS_ISDISCONNECTING|SS_NBIO)) ==
                    760:                            (SS_ISDISCONNECTING|SS_NBIO))
1.1       cgd       761:                                goto drop;
1.21      christos  762:                        while (so->so_state & SS_ISCONNECTED) {
1.185     yamt      763:                                error = sowait(so, true, so->so_linger * hz);
1.21      christos  764:                                if (error)
1.1       cgd       765:                                        break;
1.21      christos  766:                        }
1.1       cgd       767:                }
                    768:        }
1.54      lukem     769:  drop:
1.1       cgd       770:        if (so->so_pcb) {
1.215.4.1  rmind     771:                (*so->so_proto->pr_usrreqs->pr_detach)(so);
1.1       cgd       772:        }
1.54      lukem     773:  discard:
1.215.4.1  rmind     774:        KASSERT((so->so_state & SS_NOFDREF) == 0);
1.198     elad      775:        kauth_cred_free(so->so_cred);
1.1       cgd       776:        so->so_state |= SS_NOFDREF;
                    777:        sofree(so);
1.215.4.1  rmind     778:        return error;
1.1       cgd       779: }
                    780:
                    781: /*
1.160     ad        782:  * Must be called with the socket locked..  Will return with it unlocked.
1.1       cgd       783:  */
1.3       andrew    784: int
1.54      lukem     785: soabort(struct socket *so)
1.1       cgd       786: {
1.161     ad        787:        u_int refs;
1.139     yamt      788:        int error;
1.215.4.3  rmind     789:
1.160     ad        790:        KASSERT(solocked(so));
                    791:        KASSERT(so->so_head == NULL);
1.1       cgd       792:
1.215.4.3  rmind     793:        soref(so);
1.215.4.1  rmind     794:        error = (*so->so_proto->pr_usrreqs->pr_generic)(so,
                    795:            PRU_ABORT, NULL, NULL, NULL, NULL);
1.215.4.3  rmind     796:        refs = so->so_refcnt;
                    797:        sounref(so);
                    798:
                    799:        /* XXX: Fix PRU_ABORT to behave consistently. */
                    800:        if (error || refs == 1) {
1.139     yamt      801:                sofree(so);
1.160     ad        802:        } else {
                    803:                sounlock(so);
1.139     yamt      804:        }
1.215.4.3  rmind     805:        sounref(so);
1.139     yamt      806:        return error;
1.1       cgd       807: }
                    808:
1.3       andrew    809: int
1.54      lukem     810: soaccept(struct socket *so, struct mbuf *nam)
1.1       cgd       811: {
1.215.4.4! rmind     812:        int error;
1.160     ad        813:
                    814:        KASSERT(solocked(so));
1.215.4.1  rmind     815:        KASSERT((so->so_state & SS_NOFDREF) != 0);
1.215.4.4! rmind     816:
1.1       cgd       817:        so->so_state &= ~SS_NOFDREF;
1.215.4.1  rmind     818:
1.55      thorpej   819:        if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
                    820:            (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.215.4.1  rmind     821:                error = (*so->so_proto->pr_usrreqs->pr_generic)(so,
                    822:                    PRU_ACCEPT, NULL, nam, NULL, NULL);
1.41      mycroft   823:        else
1.53      itojun    824:                error = ECONNABORTED;
1.52      itojun    825:
1.215.4.4! rmind     826:        return error;
1.1       cgd       827: }
                    828:
1.3       andrew    829: int
1.114     christos  830: soconnect(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1       cgd       831: {
1.215.4.1  rmind     832:        int error;
1.160     ad        833:
                    834:        KASSERT(solocked(so));
1.1       cgd       835:
                    836:        if (so->so_options & SO_ACCEPTCONN)
1.215.4.4! rmind     837:                return EOPNOTSUPP;
1.1       cgd       838:        /*
                    839:         * If protocol is connection-based, can only connect once.
                    840:         * Otherwise, if connected, try to disconnect first.
                    841:         * This allows user to disconnect by connecting to, e.g.,
                    842:         * a null address.
                    843:         */
                    844:        if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
                    845:            ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
                    846:            (error = sodisconnect(so))))
                    847:                error = EISCONN;
                    848:        else
1.215.4.1  rmind     849:                error = (*so->so_proto->pr_usrreqs->pr_generic)(so,
                    850:                    PRU_CONNECT, NULL, nam, NULL, l);
                    851:
                    852:        return error;
1.1       cgd       853: }
                    854:
1.3       andrew    855: int
1.54      lukem     856: soconnect2(struct socket *so1, struct socket *so2)
1.1       cgd       857: {
1.160     ad        858:        KASSERT(solocked2(so1, so2));
1.1       cgd       859:
1.215.4.4! rmind     860:        return (*so1->so_proto->pr_usrreqs->pr_generic)(so1,
        !           861:            PRU_CONNECT2, NULL, (struct mbuf *)so2, NULL, NULL);
1.1       cgd       862: }
                    863:
1.3       andrew    864: int
1.54      lukem     865: sodisconnect(struct socket *so)
1.1       cgd       866: {
1.160     ad        867:        int     error;
                    868:
                    869:        KASSERT(solocked(so));
1.1       cgd       870:
                    871:        if ((so->so_state & SS_ISCONNECTED) == 0) {
                    872:                error = ENOTCONN;
1.160     ad        873:        } else if (so->so_state & SS_ISDISCONNECTING) {
1.1       cgd       874:                error = EALREADY;
1.160     ad        875:        } else {
1.215.4.1  rmind     876:                error = (*so->so_proto->pr_usrreqs->pr_generic)(so,
                    877:                    PRU_DISCONNECT, NULL, NULL, NULL, NULL);
1.1       cgd       878:        }
                    879:        return (error);
                    880: }
                    881:
1.15      mycroft   882: #define        SBLOCKWAIT(f)   (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1       cgd       883: /*
                    884:  * Send on a socket.
                    885:  * If send must go all at once and message is larger than
                    886:  * send buffering, then hard error.
                    887:  * Lock against other senders.
                    888:  * If must go all at once and not enough room now, then
                    889:  * inform user that this would block and do nothing.
                    890:  * Otherwise, if nonblocking, send as much as possible.
                    891:  * The data to be sent is described by "uio" if nonzero,
                    892:  * otherwise by the mbuf chain "top" (which must be null
                    893:  * if uio is not).  Data provided in mbuf chain must be small
                    894:  * enough to send all at once.
                    895:  *
                    896:  * Returns nonzero on error, timeout or signal; callers
                    897:  * must check for short counts if EINTR/ERESTART are returned.
                    898:  * Data and control buffers are freed on return.
                    899:  */
1.3       andrew    900: int
1.54      lukem     901: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
1.114     christos  902:        struct mbuf *control, int flags, struct lwp *l)
1.1       cgd       903: {
1.54      lukem     904:        struct mbuf     **mp, *m;
1.58      jdolecek  905:        long            space, len, resid, clen, mlen;
                    906:        int             error, s, dontroute, atomic;
1.196     dsl       907:        short           wakeup_state = 0;
1.54      lukem     908:
1.160     ad        909:        clen = 0;
1.64      thorpej   910:
1.160     ad        911:        /*
                    912:         * solock() provides atomicity of access.  splsoftnet() prevents
                    913:         * protocol processing soft interrupts from interrupting us and
                    914:         * blocking (expensive).
                    915:         */
                    916:        s = splsoftnet();
                    917:        solock(so);
1.54      lukem     918:        atomic = sosendallatonce(so) || top;
1.1       cgd       919:        if (uio)
                    920:                resid = uio->uio_resid;
                    921:        else
                    922:                resid = top->m_pkthdr.len;
1.7       cgd       923:        /*
                    924:         * In theory resid should be unsigned.
                    925:         * However, space must be signed, as it might be less than 0
                    926:         * if we over-committed, and we must use a signed comparison
                    927:         * of space and resid.  On the other hand, a negative resid
                    928:         * causes us to loop sending 0-length segments to the protocol.
                    929:         */
1.29      mycroft   930:        if (resid < 0) {
                    931:                error = EINVAL;
                    932:                goto out;
                    933:        }
1.1       cgd       934:        dontroute =
                    935:            (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
                    936:            (so->so_proto->pr_flags & PR_ATOMIC);
1.165     christos  937:        l->l_ru.ru_msgsnd++;
1.1       cgd       938:        if (control)
                    939:                clen = control->m_len;
1.54      lukem     940:  restart:
1.21      christos  941:        if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1       cgd       942:                goto out;
                    943:        do {
1.160     ad        944:                if (so->so_state & SS_CANTSENDMORE) {
                    945:                        error = EPIPE;
                    946:                        goto release;
                    947:                }
1.48      thorpej   948:                if (so->so_error) {
                    949:                        error = so->so_error;
                    950:                        so->so_error = 0;
                    951:                        goto release;
                    952:                }
1.1       cgd       953:                if ((so->so_state & SS_ISCONNECTED) == 0) {
                    954:                        if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
1.215.4.4! rmind     955:                                if (resid || clen == 0) {
1.160     ad        956:                                        error = ENOTCONN;
                    957:                                        goto release;
                    958:                                }
                    959:                        } else if (addr == 0) {
                    960:                                error = EDESTADDRREQ;
                    961:                                goto release;
                    962:                        }
1.1       cgd       963:                }
                    964:                space = sbspace(&so->so_snd);
                    965:                if (flags & MSG_OOB)
                    966:                        space += 1024;
1.21      christos  967:                if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160     ad        968:                    clen > so->so_snd.sb_hiwat) {
                    969:                        error = EMSGSIZE;
                    970:                        goto release;
                    971:                }
1.96      mycroft   972:                if (space < resid + clen &&
1.1       cgd       973:                    (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.206     christos  974:                        if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1.160     ad        975:                                error = EWOULDBLOCK;
                    976:                                goto release;
                    977:                        }
1.1       cgd       978:                        sbunlock(&so->so_snd);
1.196     dsl       979:                        if (wakeup_state & SS_RESTARTSYS) {
                    980:                                error = ERESTART;
                    981:                                goto out;
                    982:                        }
1.1       cgd       983:                        error = sbwait(&so->so_snd);
                    984:                        if (error)
                    985:                                goto out;
1.196     dsl       986:                        wakeup_state = so->so_state;
1.1       cgd       987:                        goto restart;
                    988:                }
1.196     dsl       989:                wakeup_state = 0;
1.1       cgd       990:                mp = &top;
                    991:                space -= clen;
                    992:                do {
1.45      tv        993:                        if (uio == NULL) {
                    994:                                /*
                    995:                                 * Data is prepackaged in "top".
                    996:                                 */
                    997:                                resid = 0;
                    998:                                if (flags & MSG_EOR)
                    999:                                        top->m_flags |= M_EOR;
                   1000:                        } else do {
1.160     ad       1001:                                sounlock(so);
                   1002:                                splx(s);
1.144     dyoung   1003:                                if (top == NULL) {
1.78      matt     1004:                                        m = m_gethdr(M_WAIT, MT_DATA);
1.45      tv       1005:                                        mlen = MHLEN;
                   1006:                                        m->m_pkthdr.len = 0;
1.140     dyoung   1007:                                        m->m_pkthdr.rcvif = NULL;
1.45      tv       1008:                                } else {
1.78      matt     1009:                                        m = m_get(M_WAIT, MT_DATA);
1.45      tv       1010:                                        mlen = MLEN;
                   1011:                                }
1.78      matt     1012:                                MCLAIM(m, so->so_snd.sb_mowner);
1.121     yamt     1013:                                if (sock_loan_thresh >= 0 &&
                   1014:                                    uio->uio_iov->iov_len >= sock_loan_thresh &&
                   1015:                                    space >= sock_loan_thresh &&
1.64      thorpej  1016:                                    (len = sosend_loan(so, uio, m,
                   1017:                                                       space)) != 0) {
                   1018:                                        SOSEND_COUNTER_INCR(&sosend_loan_big);
                   1019:                                        space -= len;
                   1020:                                        goto have_data;
                   1021:                                }
1.45      tv       1022:                                if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64      thorpej  1023:                                        SOSEND_COUNTER_INCR(&sosend_copy_big);
1.201     oki      1024:                                        m_clget(m, M_DONTWAIT);
1.45      tv       1025:                                        if ((m->m_flags & M_EXT) == 0)
                   1026:                                                goto nopages;
                   1027:                                        mlen = MCLBYTES;
                   1028:                                        if (atomic && top == 0) {
1.58      jdolecek 1029:                                                len = lmin(MCLBYTES - max_hdr,
1.54      lukem    1030:                                                    resid);
1.45      tv       1031:                                                m->m_data += max_hdr;
                   1032:                                        } else
1.58      jdolecek 1033:                                                len = lmin(MCLBYTES, resid);
1.45      tv       1034:                                        space -= len;
                   1035:                                } else {
1.64      thorpej  1036:  nopages:
                   1037:                                        SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58      jdolecek 1038:                                        len = lmin(lmin(mlen, resid), space);
1.45      tv       1039:                                        space -= len;
                   1040:                                        /*
                   1041:                                         * For datagram protocols, leave room
                   1042:                                         * for protocol headers in first mbuf.
                   1043:                                         */
                   1044:                                        if (atomic && top == 0 && len < mlen)
                   1045:                                                MH_ALIGN(m, len);
                   1046:                                }
1.144     dyoung   1047:                                error = uiomove(mtod(m, void *), (int)len, uio);
1.64      thorpej  1048:  have_data:
1.45      tv       1049:                                resid = uio->uio_resid;
                   1050:                                m->m_len = len;
                   1051:                                *mp = m;
                   1052:                                top->m_pkthdr.len += len;
1.160     ad       1053:                                s = splsoftnet();
                   1054:                                solock(so);
1.144     dyoung   1055:                                if (error != 0)
1.45      tv       1056:                                        goto release;
                   1057:                                mp = &m->m_next;
                   1058:                                if (resid <= 0) {
                   1059:                                        if (flags & MSG_EOR)
                   1060:                                                top->m_flags |= M_EOR;
                   1061:                                        break;
                   1062:                                }
                   1063:                        } while (space > 0 && atomic);
1.108     perry    1064:
1.160     ad       1065:                        if (so->so_state & SS_CANTSENDMORE) {
                   1066:                                error = EPIPE;
                   1067:                                goto release;
                   1068:                        }
1.45      tv       1069:                        if (dontroute)
                   1070:                                so->so_options |= SO_DONTROUTE;
                   1071:                        if (resid > 0)
                   1072:                                so->so_state |= SS_MORETOCOME;
1.215.4.1  rmind    1073:                        error = (*so->so_proto->pr_usrreqs->pr_generic)(so,
1.46      sommerfe 1074:                            (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
1.160     ad       1075:                            top, addr, control, curlwp);
1.45      tv       1076:                        if (dontroute)
                   1077:                                so->so_options &= ~SO_DONTROUTE;
                   1078:                        if (resid > 0)
                   1079:                                so->so_state &= ~SS_MORETOCOME;
                   1080:                        clen = 0;
1.144     dyoung   1081:                        control = NULL;
                   1082:                        top = NULL;
1.45      tv       1083:                        mp = &top;
1.144     dyoung   1084:                        if (error != 0)
1.1       cgd      1085:                                goto release;
                   1086:                } while (resid && space > 0);
                   1087:        } while (resid);
                   1088:
1.54      lukem    1089:  release:
1.1       cgd      1090:        sbunlock(&so->so_snd);
1.54      lukem    1091:  out:
1.160     ad       1092:        sounlock(so);
                   1093:        splx(s);
1.1       cgd      1094:        if (top)
                   1095:                m_freem(top);
                   1096:        if (control)
                   1097:                m_freem(control);
                   1098:        return (error);
                   1099: }
                   1100:
                   1101: /*
1.159     ad       1102:  * Following replacement or removal of the first mbuf on the first
                   1103:  * mbuf chain of a socket buffer, push necessary state changes back
                   1104:  * into the socket buffer so that other consumers see the values
                   1105:  * consistently.  'nextrecord' is the callers locally stored value of
                   1106:  * the original value of sb->sb_mb->m_nextpkt which must be restored
                   1107:  * when the lead mbuf changes.  NOTE: 'nextrecord' may be NULL.
                   1108:  */
                   1109: static void
                   1110: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
                   1111: {
                   1112:
1.160     ad       1113:        KASSERT(solocked(sb->sb_so));
                   1114:
1.159     ad       1115:        /*
                   1116:         * First, update for the new value of nextrecord.  If necessary,
                   1117:         * make it the first record.
                   1118:         */
                   1119:        if (sb->sb_mb != NULL)
                   1120:                sb->sb_mb->m_nextpkt = nextrecord;
                   1121:        else
                   1122:                sb->sb_mb = nextrecord;
                   1123:
                   1124:         /*
                   1125:          * Now update any dependent socket buffer fields to reflect
                   1126:          * the new state.  This is an inline of SB_EMPTY_FIXUP, with
                   1127:          * the addition of a second clause that takes care of the
                   1128:          * case where sb_mb has been updated, but remains the last
                   1129:          * record.
                   1130:          */
                   1131:         if (sb->sb_mb == NULL) {
                   1132:                 sb->sb_mbtail = NULL;
                   1133:                 sb->sb_lastrecord = NULL;
                   1134:         } else if (sb->sb_mb->m_nextpkt == NULL)
                   1135:                 sb->sb_lastrecord = sb->sb_mb;
                   1136: }
                   1137:
                   1138: /*
1.1       cgd      1139:  * Implement receive operations on a socket.
                   1140:  * We depend on the way that records are added to the sockbuf
                   1141:  * by sbappend*.  In particular, each record (mbufs linked through m_next)
                   1142:  * must begin with an address if the protocol so specifies,
                   1143:  * followed by an optional mbuf or mbufs containing ancillary data,
                   1144:  * and then zero or more mbufs of data.
                   1145:  * In order to avoid blocking network interrupts for the entire time here,
                   1146:  * we splx() while doing the actual copy to user space.
                   1147:  * Although the sockbuf is locked, new data may still be appended,
                   1148:  * and thus we must maintain consistency of the sockbuf during that time.
                   1149:  *
                   1150:  * The caller may receive the data as a single mbuf chain by supplying
                   1151:  * an mbuf **mp0 for use in returning the chain.  The uio is then used
                   1152:  * only for the count in uio_resid.
                   1153:  */
1.3       andrew   1154: int
1.54      lukem    1155: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
                   1156:        struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1       cgd      1157: {
1.116     yamt     1158:        struct lwp *l = curlwp;
1.160     ad       1159:        struct mbuf     *m, **mp, *mt;
1.211     chs      1160:        size_t len, offset, moff, orig_resid;
                   1161:        int atomic, flags, error, s, type;
1.99      matt     1162:        const struct protosw    *pr;
1.54      lukem    1163:        struct mbuf     *nextrecord;
1.67      he       1164:        int             mbuf_removed = 0;
1.146     dyoung   1165:        const struct domain *dom;
1.196     dsl      1166:        short           wakeup_state = 0;
1.64      thorpej  1167:
1.54      lukem    1168:        pr = so->so_proto;
1.146     dyoung   1169:        atomic = pr->pr_flags & PR_ATOMIC;
                   1170:        dom = pr->pr_domain;
1.1       cgd      1171:        mp = mp0;
1.54      lukem    1172:        type = 0;
                   1173:        orig_resid = uio->uio_resid;
1.102     jonathan 1174:
1.144     dyoung   1175:        if (paddr != NULL)
                   1176:                *paddr = NULL;
                   1177:        if (controlp != NULL)
                   1178:                *controlp = NULL;
                   1179:        if (flagsp != NULL)
1.1       cgd      1180:                flags = *flagsp &~ MSG_EOR;
                   1181:        else
                   1182:                flags = 0;
1.66      enami    1183:
1.1       cgd      1184:        if (flags & MSG_OOB) {
                   1185:                m = m_get(M_WAIT, MT_DATA);
1.160     ad       1186:                solock(so);
1.215.4.1  rmind    1187:                error = (*pr->pr_usrreqs->pr_generic)(so, PRU_RCVOOB, m,
1.140     dyoung   1188:                    (struct mbuf *)(long)(flags & MSG_PEEK), NULL, l);
1.160     ad       1189:                sounlock(so);
1.1       cgd      1190:                if (error)
                   1191:                        goto bad;
                   1192:                do {
1.134     christos 1193:                        error = uiomove(mtod(m, void *),
1.211     chs      1194:                            MIN(uio->uio_resid, m->m_len), uio);
1.1       cgd      1195:                        m = m_free(m);
1.144     dyoung   1196:                } while (uio->uio_resid > 0 && error == 0 && m);
1.54      lukem    1197:  bad:
1.144     dyoung   1198:                if (m != NULL)
1.1       cgd      1199:                        m_freem(m);
1.144     dyoung   1200:                return error;
1.1       cgd      1201:        }
1.144     dyoung   1202:        if (mp != NULL)
1.140     dyoung   1203:                *mp = NULL;
1.160     ad       1204:
                   1205:        /*
                   1206:         * solock() provides atomicity of access.  splsoftnet() prevents
                   1207:         * protocol processing soft interrupts from interrupting us and
                   1208:         * blocking (expensive).
                   1209:         */
                   1210:        s = splsoftnet();
                   1211:        solock(so);
1.54      lukem    1212:  restart:
1.160     ad       1213:        if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
                   1214:                sounlock(so);
                   1215:                splx(s);
1.144     dyoung   1216:                return error;
1.160     ad       1217:        }
1.1       cgd      1218:
                   1219:        m = so->so_rcv.sb_mb;
                   1220:        /*
                   1221:         * If we have less data than requested, block awaiting more
                   1222:         * (subject to any timeout) if:
1.15      mycroft  1223:         *   1. the current count is less than the low water mark,
1.1       cgd      1224:         *   2. MSG_WAITALL is set, and it is possible to do the entire
1.15      mycroft  1225:         *      receive operation at once if we block (resid <= hiwat), or
                   1226:         *   3. MSG_DONTWAIT is not set.
1.1       cgd      1227:         * If MSG_WAITALL is set but resid is larger than the receive buffer,
                   1228:         * we have to do the receive in sections, and thus risk returning
                   1229:         * a short count if a timeout or signal occurs after we start.
                   1230:         */
1.144     dyoung   1231:        if (m == NULL ||
                   1232:            ((flags & MSG_DONTWAIT) == 0 &&
                   1233:             so->so_rcv.sb_cc < uio->uio_resid &&
                   1234:             (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
                   1235:              ((flags & MSG_WAITALL) &&
                   1236:               uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146     dyoung   1237:             m->m_nextpkt == NULL && !atomic)) {
1.1       cgd      1238: #ifdef DIAGNOSTIC
1.144     dyoung   1239:                if (m == NULL && so->so_rcv.sb_cc)
1.1       cgd      1240:                        panic("receive 1");
                   1241: #endif
                   1242:                if (so->so_error) {
1.144     dyoung   1243:                        if (m != NULL)
1.15      mycroft  1244:                                goto dontblock;
1.1       cgd      1245:                        error = so->so_error;
                   1246:                        if ((flags & MSG_PEEK) == 0)
                   1247:                                so->so_error = 0;
                   1248:                        goto release;
                   1249:                }
                   1250:                if (so->so_state & SS_CANTRCVMORE) {
1.144     dyoung   1251:                        if (m != NULL)
1.15      mycroft  1252:                                goto dontblock;
1.1       cgd      1253:                        else
                   1254:                                goto release;
                   1255:                }
1.144     dyoung   1256:                for (; m != NULL; m = m->m_next)
1.1       cgd      1257:                        if (m->m_type == MT_OOBDATA  || (m->m_flags & M_EOR)) {
                   1258:                                m = so->so_rcv.sb_mb;
                   1259:                                goto dontblock;
                   1260:                        }
                   1261:                if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
                   1262:                    (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
                   1263:                        error = ENOTCONN;
                   1264:                        goto release;
                   1265:                }
                   1266:                if (uio->uio_resid == 0)
                   1267:                        goto release;
1.206     christos 1268:                if ((so->so_state & SS_NBIO) ||
                   1269:                    (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1.1       cgd      1270:                        error = EWOULDBLOCK;
                   1271:                        goto release;
                   1272:                }
1.69      thorpej  1273:                SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
                   1274:                SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1       cgd      1275:                sbunlock(&so->so_rcv);
1.196     dsl      1276:                if (wakeup_state & SS_RESTARTSYS)
                   1277:                        error = ERESTART;
                   1278:                else
                   1279:                        error = sbwait(&so->so_rcv);
1.160     ad       1280:                if (error != 0) {
                   1281:                        sounlock(so);
                   1282:                        splx(s);
1.144     dyoung   1283:                        return error;
1.160     ad       1284:                }
1.196     dsl      1285:                wakeup_state = so->so_state;
1.1       cgd      1286:                goto restart;
                   1287:        }
1.54      lukem    1288:  dontblock:
1.69      thorpej  1289:        /*
                   1290:         * On entry here, m points to the first record of the socket buffer.
1.159     ad       1291:         * From this point onward, we maintain 'nextrecord' as a cache of the
                   1292:         * pointer to the next record in the socket buffer.  We must keep the
                   1293:         * various socket buffer pointers and local stack versions of the
                   1294:         * pointers in sync, pushing out modifications before dropping the
1.160     ad       1295:         * socket lock, and re-reading them when picking it up.
1.159     ad       1296:         *
                   1297:         * Otherwise, we will race with the network stack appending new data
                   1298:         * or records onto the socket buffer by using inconsistent/stale
                   1299:         * versions of the field, possibly resulting in socket buffer
                   1300:         * corruption.
                   1301:         *
                   1302:         * By holding the high-level sblock(), we prevent simultaneous
                   1303:         * readers from pulling off the front of the socket buffer.
1.69      thorpej  1304:         */
1.144     dyoung   1305:        if (l != NULL)
1.157     ad       1306:                l->l_ru.ru_msgrcv++;
1.69      thorpej  1307:        KASSERT(m == so->so_rcv.sb_mb);
                   1308:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
                   1309:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1       cgd      1310:        nextrecord = m->m_nextpkt;
                   1311:        if (pr->pr_flags & PR_ADDR) {
                   1312: #ifdef DIAGNOSTIC
                   1313:                if (m->m_type != MT_SONAME)
                   1314:                        panic("receive 1a");
                   1315: #endif
1.3       andrew   1316:                orig_resid = 0;
1.1       cgd      1317:                if (flags & MSG_PEEK) {
                   1318:                        if (paddr)
                   1319:                                *paddr = m_copy(m, 0, m->m_len);
                   1320:                        m = m->m_next;
                   1321:                } else {
                   1322:                        sbfree(&so->so_rcv, m);
1.67      he       1323:                        mbuf_removed = 1;
1.144     dyoung   1324:                        if (paddr != NULL) {
1.1       cgd      1325:                                *paddr = m;
                   1326:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1327:                                m->m_next = NULL;
1.1       cgd      1328:                                m = so->so_rcv.sb_mb;
                   1329:                        } else {
                   1330:                                MFREE(m, so->so_rcv.sb_mb);
                   1331:                                m = so->so_rcv.sb_mb;
                   1332:                        }
1.159     ad       1333:                        sbsync(&so->so_rcv, nextrecord);
1.1       cgd      1334:                }
                   1335:        }
1.159     ad       1336:
                   1337:        /*
                   1338:         * Process one or more MT_CONTROL mbufs present before any data mbufs
                   1339:         * in the first mbuf chain on the socket buffer.  If MSG_PEEK, we
                   1340:         * just copy the data; if !MSG_PEEK, we call into the protocol to
                   1341:         * perform externalization (or freeing if controlp == NULL).
                   1342:         */
                   1343:        if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
                   1344:                struct mbuf *cm = NULL, *cmn;
                   1345:                struct mbuf **cme = &cm;
                   1346:
                   1347:                do {
                   1348:                        if (flags & MSG_PEEK) {
                   1349:                                if (controlp != NULL) {
                   1350:                                        *controlp = m_copy(m, 0, m->m_len);
                   1351:                                        controlp = &(*controlp)->m_next;
                   1352:                                }
                   1353:                                m = m->m_next;
                   1354:                        } else {
                   1355:                                sbfree(&so->so_rcv, m);
1.1       cgd      1356:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1357:                                m->m_next = NULL;
1.159     ad       1358:                                *cme = m;
                   1359:                                cme = &(*cme)->m_next;
1.1       cgd      1360:                                m = so->so_rcv.sb_mb;
1.159     ad       1361:                        }
                   1362:                } while (m != NULL && m->m_type == MT_CONTROL);
                   1363:                if ((flags & MSG_PEEK) == 0)
                   1364:                        sbsync(&so->so_rcv, nextrecord);
                   1365:                for (; cm != NULL; cm = cmn) {
                   1366:                        cmn = cm->m_next;
                   1367:                        cm->m_next = NULL;
                   1368:                        type = mtod(cm, struct cmsghdr *)->cmsg_type;
                   1369:                        if (controlp != NULL) {
                   1370:                                if (dom->dom_externalize != NULL &&
                   1371:                                    type == SCM_RIGHTS) {
1.160     ad       1372:                                        sounlock(so);
1.159     ad       1373:                                        splx(s);
1.204     christos 1374:                                        error = (*dom->dom_externalize)(cm, l,
                   1375:                                            (flags & MSG_CMSG_CLOEXEC) ?
                   1376:                                            O_CLOEXEC : 0);
1.159     ad       1377:                                        s = splsoftnet();
1.160     ad       1378:                                        solock(so);
1.159     ad       1379:                                }
                   1380:                                *controlp = cm;
                   1381:                                while (*controlp != NULL)
                   1382:                                        controlp = &(*controlp)->m_next;
1.1       cgd      1383:                        } else {
1.106     itojun   1384:                                /*
                   1385:                                 * Dispose of any SCM_RIGHTS message that went
                   1386:                                 * through the read path rather than recv.
                   1387:                                 */
1.159     ad       1388:                                if (dom->dom_dispose != NULL &&
                   1389:                                    type == SCM_RIGHTS) {
1.160     ad       1390:                                        sounlock(so);
1.159     ad       1391:                                        (*dom->dom_dispose)(cm);
1.160     ad       1392:                                        solock(so);
1.159     ad       1393:                                }
                   1394:                                m_freem(cm);
1.1       cgd      1395:                        }
                   1396:                }
1.159     ad       1397:                if (m != NULL)
                   1398:                        nextrecord = so->so_rcv.sb_mb->m_nextpkt;
                   1399:                else
                   1400:                        nextrecord = so->so_rcv.sb_mb;
                   1401:                orig_resid = 0;
1.1       cgd      1402:        }
1.69      thorpej  1403:
1.159     ad       1404:        /* If m is non-NULL, we have some data to read. */
                   1405:        if (__predict_true(m != NULL)) {
1.1       cgd      1406:                type = m->m_type;
                   1407:                if (type == MT_OOBDATA)
                   1408:                        flags |= MSG_OOB;
                   1409:        }
1.69      thorpej  1410:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
                   1411:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
                   1412:
1.1       cgd      1413:        moff = 0;
                   1414:        offset = 0;
1.144     dyoung   1415:        while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1       cgd      1416:                if (m->m_type == MT_OOBDATA) {
                   1417:                        if (type != MT_OOBDATA)
                   1418:                                break;
                   1419:                } else if (type == MT_OOBDATA)
                   1420:                        break;
                   1421: #ifdef DIAGNOSTIC
                   1422:                else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
                   1423:                        panic("receive 3");
                   1424: #endif
                   1425:                so->so_state &= ~SS_RCVATMARK;
1.196     dsl      1426:                wakeup_state = 0;
1.1       cgd      1427:                len = uio->uio_resid;
                   1428:                if (so->so_oobmark && len > so->so_oobmark - offset)
                   1429:                        len = so->so_oobmark - offset;
                   1430:                if (len > m->m_len - moff)
                   1431:                        len = m->m_len - moff;
                   1432:                /*
                   1433:                 * If mp is set, just pass back the mbufs.
                   1434:                 * Otherwise copy them out via the uio, then free.
                   1435:                 * Sockbuf must be consistent here (points to current mbuf,
                   1436:                 * it points to next record) when we drop priority;
                   1437:                 * we must note any additions to the sockbuf when we
                   1438:                 * block interrupts again.
                   1439:                 */
1.144     dyoung   1440:                if (mp == NULL) {
1.69      thorpej  1441:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
                   1442:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160     ad       1443:                        sounlock(so);
1.1       cgd      1444:                        splx(s);
1.211     chs      1445:                        error = uiomove(mtod(m, char *) + moff, len, uio);
1.20      mycroft  1446:                        s = splsoftnet();
1.160     ad       1447:                        solock(so);
1.144     dyoung   1448:                        if (error != 0) {
1.67      he       1449:                                /*
                   1450:                                 * If any part of the record has been removed
                   1451:                                 * (such as the MT_SONAME mbuf, which will
                   1452:                                 * happen when PR_ADDR, and thus also
                   1453:                                 * PR_ATOMIC, is set), then drop the entire
                   1454:                                 * record to maintain the atomicity of the
                   1455:                                 * receive operation.
                   1456:                                 *
                   1457:                                 * This avoids a later panic("receive 1a")
                   1458:                                 * when compiled with DIAGNOSTIC.
                   1459:                                 */
1.146     dyoung   1460:                                if (m && mbuf_removed && atomic)
1.67      he       1461:                                        (void) sbdroprecord(&so->so_rcv);
                   1462:
1.57      jdolecek 1463:                                goto release;
1.67      he       1464:                        }
1.1       cgd      1465:                } else
                   1466:                        uio->uio_resid -= len;
                   1467:                if (len == m->m_len - moff) {
                   1468:                        if (m->m_flags & M_EOR)
                   1469:                                flags |= MSG_EOR;
                   1470:                        if (flags & MSG_PEEK) {
                   1471:                                m = m->m_next;
                   1472:                                moff = 0;
                   1473:                        } else {
                   1474:                                nextrecord = m->m_nextpkt;
                   1475:                                sbfree(&so->so_rcv, m);
                   1476:                                if (mp) {
                   1477:                                        *mp = m;
                   1478:                                        mp = &m->m_next;
                   1479:                                        so->so_rcv.sb_mb = m = m->m_next;
1.140     dyoung   1480:                                        *mp = NULL;
1.1       cgd      1481:                                } else {
                   1482:                                        MFREE(m, so->so_rcv.sb_mb);
                   1483:                                        m = so->so_rcv.sb_mb;
                   1484:                                }
1.69      thorpej  1485:                                /*
                   1486:                                 * If m != NULL, we also know that
                   1487:                                 * so->so_rcv.sb_mb != NULL.
                   1488:                                 */
                   1489:                                KASSERT(so->so_rcv.sb_mb == m);
                   1490:                                if (m) {
1.1       cgd      1491:                                        m->m_nextpkt = nextrecord;
1.69      thorpej  1492:                                        if (nextrecord == NULL)
                   1493:                                                so->so_rcv.sb_lastrecord = m;
                   1494:                                } else {
                   1495:                                        so->so_rcv.sb_mb = nextrecord;
1.70      thorpej  1496:                                        SB_EMPTY_FIXUP(&so->so_rcv);
1.69      thorpej  1497:                                }
                   1498:                                SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
                   1499:                                SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1       cgd      1500:                        }
1.144     dyoung   1501:                } else if (flags & MSG_PEEK)
                   1502:                        moff += len;
                   1503:                else {
1.160     ad       1504:                        if (mp != NULL) {
                   1505:                                mt = m_copym(m, 0, len, M_NOWAIT);
                   1506:                                if (__predict_false(mt == NULL)) {
                   1507:                                        sounlock(so);
                   1508:                                        mt = m_copym(m, 0, len, M_WAIT);
                   1509:                                        solock(so);
                   1510:                                }
                   1511:                                *mp = mt;
                   1512:                        }
1.144     dyoung   1513:                        m->m_data += len;
                   1514:                        m->m_len -= len;
                   1515:                        so->so_rcv.sb_cc -= len;
1.1       cgd      1516:                }
                   1517:                if (so->so_oobmark) {
                   1518:                        if ((flags & MSG_PEEK) == 0) {
                   1519:                                so->so_oobmark -= len;
                   1520:                                if (so->so_oobmark == 0) {
                   1521:                                        so->so_state |= SS_RCVATMARK;
                   1522:                                        break;
                   1523:                                }
1.7       cgd      1524:                        } else {
1.1       cgd      1525:                                offset += len;
1.7       cgd      1526:                                if (offset == so->so_oobmark)
                   1527:                                        break;
                   1528:                        }
1.1       cgd      1529:                }
                   1530:                if (flags & MSG_EOR)
                   1531:                        break;
                   1532:                /*
                   1533:                 * If the MSG_WAITALL flag is set (for non-atomic socket),
                   1534:                 * we must not quit until "uio->uio_resid == 0" or an error
                   1535:                 * termination.  If a signal/timeout occurs, return
                   1536:                 * with a short count but without error.
                   1537:                 * Keep sockbuf locked against other readers.
                   1538:                 */
1.144     dyoung   1539:                while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3       andrew   1540:                    !sosendallatonce(so) && !nextrecord) {
1.1       cgd      1541:                        if (so->so_error || so->so_state & SS_CANTRCVMORE)
                   1542:                                break;
1.68      matt     1543:                        /*
                   1544:                         * If we are peeking and the socket receive buffer is
                   1545:                         * full, stop since we can't get more data to peek at.
                   1546:                         */
                   1547:                        if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
                   1548:                                break;
                   1549:                        /*
                   1550:                         * If we've drained the socket buffer, tell the
                   1551:                         * protocol in case it needs to do something to
                   1552:                         * get it filled again.
                   1553:                         */
                   1554:                        if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
1.215.4.1  rmind    1555:                                (*pr->pr_usrreqs->pr_generic)(so, PRU_RCVD,
1.140     dyoung   1556:                                    NULL, (struct mbuf *)(long)flags, NULL, l);
1.69      thorpej  1557:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
                   1558:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196     dsl      1559:                        if (wakeup_state & SS_RESTARTSYS)
                   1560:                                error = ERESTART;
                   1561:                        else
                   1562:                                error = sbwait(&so->so_rcv);
1.144     dyoung   1563:                        if (error != 0) {
1.1       cgd      1564:                                sbunlock(&so->so_rcv);
1.160     ad       1565:                                sounlock(so);
1.1       cgd      1566:                                splx(s);
1.144     dyoung   1567:                                return 0;
1.1       cgd      1568:                        }
1.21      christos 1569:                        if ((m = so->so_rcv.sb_mb) != NULL)
1.1       cgd      1570:                                nextrecord = m->m_nextpkt;
1.196     dsl      1571:                        wakeup_state = so->so_state;
1.1       cgd      1572:                }
                   1573:        }
1.3       andrew   1574:
1.146     dyoung   1575:        if (m && atomic) {
1.3       andrew   1576:                flags |= MSG_TRUNC;
                   1577:                if ((flags & MSG_PEEK) == 0)
                   1578:                        (void) sbdroprecord(&so->so_rcv);
                   1579:        }
1.1       cgd      1580:        if ((flags & MSG_PEEK) == 0) {
1.144     dyoung   1581:                if (m == NULL) {
1.69      thorpej  1582:                        /*
1.70      thorpej  1583:                         * First part is an inline SB_EMPTY_FIXUP().  Second
1.69      thorpej  1584:                         * part makes sure sb_lastrecord is up-to-date if
                   1585:                         * there is still data in the socket buffer.
                   1586:                         */
1.1       cgd      1587:                        so->so_rcv.sb_mb = nextrecord;
1.69      thorpej  1588:                        if (so->so_rcv.sb_mb == NULL) {
                   1589:                                so->so_rcv.sb_mbtail = NULL;
                   1590:                                so->so_rcv.sb_lastrecord = NULL;
                   1591:                        } else if (nextrecord->m_nextpkt == NULL)
                   1592:                                so->so_rcv.sb_lastrecord = nextrecord;
                   1593:                }
                   1594:                SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
                   1595:                SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1       cgd      1596:                if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.215.4.1  rmind    1597:                        (*pr->pr_usrreqs->pr_generic)(so, PRU_RCVD, NULL,
1.140     dyoung   1598:                            (struct mbuf *)(long)flags, NULL, l);
1.1       cgd      1599:        }
1.3       andrew   1600:        if (orig_resid == uio->uio_resid && orig_resid &&
                   1601:            (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
                   1602:                sbunlock(&so->so_rcv);
                   1603:                goto restart;
                   1604:        }
1.108     perry    1605:
1.144     dyoung   1606:        if (flagsp != NULL)
1.1       cgd      1607:                *flagsp |= flags;
1.54      lukem    1608:  release:
1.1       cgd      1609:        sbunlock(&so->so_rcv);
1.160     ad       1610:        sounlock(so);
1.1       cgd      1611:        splx(s);
1.144     dyoung   1612:        return error;
1.1       cgd      1613: }
                   1614:
1.14      mycroft  1615: int
1.54      lukem    1616: soshutdown(struct socket *so, int how)
1.1       cgd      1617: {
1.99      matt     1618:        const struct protosw    *pr;
1.160     ad       1619:        int     error;
                   1620:
                   1621:        KASSERT(solocked(so));
1.34      kleink   1622:
1.54      lukem    1623:        pr = so->so_proto;
1.34      kleink   1624:        if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
                   1625:                return (EINVAL);
1.1       cgd      1626:
1.160     ad       1627:        if (how == SHUT_RD || how == SHUT_RDWR) {
1.1       cgd      1628:                sorflush(so);
1.160     ad       1629:                error = 0;
                   1630:        }
1.34      kleink   1631:        if (how == SHUT_WR || how == SHUT_RDWR)
1.215.4.4! rmind    1632:                error = (*pr->pr_usrreqs->pr_generic)(so,
        !          1633:                    PRU_SHUTDOWN, NULL, NULL, NULL, NULL);
1.160     ad       1634:
                   1635:        return error;
1.1       cgd      1636: }
                   1637:
1.195     dsl      1638: void
1.196     dsl      1639: sorestart(struct socket *so)
1.188     ad       1640: {
1.196     dsl      1641:        /*
                   1642:         * An application has called close() on an fd on which another
                   1643:         * of its threads has called a socket system call.
                   1644:         * Mark this and wake everyone up, and code that would block again
                   1645:         * instead returns ERESTART.
                   1646:         * On system call re-entry the fd is validated and EBADF returned.
                   1647:         * Any other fd will block again on the 2nd syscall.
                   1648:         */
1.188     ad       1649:        solock(so);
1.196     dsl      1650:        so->so_state |= SS_RESTARTSYS;
1.188     ad       1651:        cv_broadcast(&so->so_cv);
1.196     dsl      1652:        cv_broadcast(&so->so_snd.sb_cv);
                   1653:        cv_broadcast(&so->so_rcv.sb_cv);
1.188     ad       1654:        sounlock(so);
                   1655: }
                   1656:
1.14      mycroft  1657: void
1.54      lukem    1658: sorflush(struct socket *so)
1.1       cgd      1659: {
1.54      lukem    1660:        struct sockbuf  *sb, asb;
1.99      matt     1661:        const struct protosw    *pr;
1.160     ad       1662:
                   1663:        KASSERT(solocked(so));
1.1       cgd      1664:
1.54      lukem    1665:        sb = &so->so_rcv;
                   1666:        pr = so->so_proto;
1.160     ad       1667:        socantrcvmore(so);
1.1       cgd      1668:        sb->sb_flags |= SB_NOINTR;
1.160     ad       1669:        (void )sblock(sb, M_WAITOK);
1.1       cgd      1670:        sbunlock(sb);
                   1671:        asb = *sb;
1.86      wrstuden 1672:        /*
                   1673:         * Clear most of the sockbuf structure, but leave some of the
                   1674:         * fields valid.
                   1675:         */
                   1676:        memset(&sb->sb_startzero, 0,
                   1677:            sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160     ad       1678:        if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
                   1679:                sounlock(so);
1.1       cgd      1680:                (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160     ad       1681:                solock(so);
                   1682:        }
1.98      christos 1683:        sbrelease(&asb, so);
1.1       cgd      1684: }
                   1685:
1.171     plunky   1686: /*
                   1687:  * internal set SOL_SOCKET options
                   1688:  */
1.142     dyoung   1689: static int
1.171     plunky   1690: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1       cgd      1691: {
1.215.4.4! rmind    1692:        int error = EINVAL, opt;
        !          1693:        int optval = 0; /* XXX: gcc */
1.171     plunky   1694:        struct linger l;
                   1695:        struct timeval tv;
1.142     dyoung   1696:
1.179     christos 1697:        switch ((opt = sopt->sopt_name)) {
1.142     dyoung   1698:
1.170     tls      1699:        case SO_ACCEPTFILTER:
1.177     ad       1700:                error = accept_filt_setopt(so, sopt);
                   1701:                KASSERT(solocked(so));
1.170     tls      1702:                break;
                   1703:
1.171     plunky   1704:        case SO_LINGER:
                   1705:                error = sockopt_get(sopt, &l, sizeof(l));
1.177     ad       1706:                solock(so);
1.171     plunky   1707:                if (error)
1.177     ad       1708:                        break;
1.171     plunky   1709:                if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1.177     ad       1710:                    l.l_linger > (INT_MAX / hz)) {
                   1711:                        error = EDOM;
                   1712:                        break;
                   1713:                }
1.171     plunky   1714:                so->so_linger = l.l_linger;
                   1715:                if (l.l_onoff)
                   1716:                        so->so_options |= SO_LINGER;
                   1717:                else
                   1718:                        so->so_options &= ~SO_LINGER;
1.177     ad       1719:                break;
1.1       cgd      1720:
1.142     dyoung   1721:        case SO_DEBUG:
                   1722:        case SO_KEEPALIVE:
                   1723:        case SO_DONTROUTE:
                   1724:        case SO_USELOOPBACK:
                   1725:        case SO_BROADCAST:
                   1726:        case SO_REUSEADDR:
                   1727:        case SO_REUSEPORT:
                   1728:        case SO_OOBINLINE:
                   1729:        case SO_TIMESTAMP:
1.207     christos 1730:        case SO_NOSIGPIPE:
1.184     christos 1731: #ifdef SO_OTIMESTAMP
                   1732:        case SO_OTIMESTAMP:
                   1733: #endif
1.171     plunky   1734:                error = sockopt_getint(sopt, &optval);
1.177     ad       1735:                solock(so);
1.171     plunky   1736:                if (error)
1.177     ad       1737:                        break;
1.171     plunky   1738:                if (optval)
1.179     christos 1739:                        so->so_options |= opt;
1.142     dyoung   1740:                else
1.179     christos 1741:                        so->so_options &= ~opt;
1.142     dyoung   1742:                break;
                   1743:
                   1744:        case SO_SNDBUF:
                   1745:        case SO_RCVBUF:
                   1746:        case SO_SNDLOWAT:
                   1747:        case SO_RCVLOWAT:
1.171     plunky   1748:                error = sockopt_getint(sopt, &optval);
1.177     ad       1749:                solock(so);
1.171     plunky   1750:                if (error)
1.177     ad       1751:                        break;
1.1       cgd      1752:
1.142     dyoung   1753:                /*
                   1754:                 * Values < 1 make no sense for any of these
                   1755:                 * options, so disallow them.
                   1756:                 */
1.177     ad       1757:                if (optval < 1) {
                   1758:                        error = EINVAL;
                   1759:                        break;
                   1760:                }
1.1       cgd      1761:
1.179     christos 1762:                switch (opt) {
1.171     plunky   1763:                case SO_SNDBUF:
1.177     ad       1764:                        if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
                   1765:                                error = ENOBUFS;
                   1766:                                break;
                   1767:                        }
1.171     plunky   1768:                        so->so_snd.sb_flags &= ~SB_AUTOSIZE;
                   1769:                        break;
1.1       cgd      1770:
                   1771:                case SO_RCVBUF:
1.177     ad       1772:                        if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
                   1773:                                error = ENOBUFS;
                   1774:                                break;
                   1775:                        }
1.171     plunky   1776:                        so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142     dyoung   1777:                        break;
                   1778:
                   1779:                /*
                   1780:                 * Make sure the low-water is never greater than
                   1781:                 * the high-water.
                   1782:                 */
1.1       cgd      1783:                case SO_SNDLOWAT:
1.171     plunky   1784:                        if (optval > so->so_snd.sb_hiwat)
                   1785:                                optval = so->so_snd.sb_hiwat;
                   1786:
                   1787:                        so->so_snd.sb_lowat = optval;
1.142     dyoung   1788:                        break;
1.171     plunky   1789:
1.1       cgd      1790:                case SO_RCVLOWAT:
1.171     plunky   1791:                        if (optval > so->so_rcv.sb_hiwat)
                   1792:                                optval = so->so_rcv.sb_hiwat;
                   1793:
                   1794:                        so->so_rcv.sb_lowat = optval;
1.142     dyoung   1795:                        break;
                   1796:                }
                   1797:                break;
1.28      thorpej  1798:
1.179     christos 1799: #ifdef COMPAT_50
                   1800:        case SO_OSNDTIMEO:
                   1801:        case SO_ORCVTIMEO: {
                   1802:                struct timeval50 otv;
                   1803:                error = sockopt_get(sopt, &otv, sizeof(otv));
1.186     pooka    1804:                if (error) {
                   1805:                        solock(so);
1.183     christos 1806:                        break;
1.186     pooka    1807:                }
1.179     christos 1808:                timeval50_to_timeval(&otv, &tv);
                   1809:                opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182     christos 1810:                error = 0;
1.179     christos 1811:                /*FALLTHROUGH*/
                   1812:        }
                   1813: #endif /* COMPAT_50 */
                   1814:
1.142     dyoung   1815:        case SO_SNDTIMEO:
                   1816:        case SO_RCVTIMEO:
1.182     christos 1817:                if (error)
1.179     christos 1818:                        error = sockopt_get(sopt, &tv, sizeof(tv));
1.177     ad       1819:                solock(so);
1.171     plunky   1820:                if (error)
1.177     ad       1821:                        break;
1.171     plunky   1822:
1.177     ad       1823:                if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
                   1824:                        error = EDOM;
                   1825:                        break;
                   1826:                }
1.28      thorpej  1827:
1.171     plunky   1828:                optval = tv.tv_sec * hz + tv.tv_usec / tick;
                   1829:                if (optval == 0 && tv.tv_usec != 0)
                   1830:                        optval = 1;
1.28      thorpej  1831:
1.179     christos 1832:                switch (opt) {
1.142     dyoung   1833:                case SO_SNDTIMEO:
1.171     plunky   1834:                        so->so_snd.sb_timeo = optval;
1.1       cgd      1835:                        break;
                   1836:                case SO_RCVTIMEO:
1.171     plunky   1837:                        so->so_rcv.sb_timeo = optval;
1.142     dyoung   1838:                        break;
                   1839:                }
                   1840:                break;
1.1       cgd      1841:
1.142     dyoung   1842:        default:
1.177     ad       1843:                solock(so);
                   1844:                error = ENOPROTOOPT;
                   1845:                break;
1.142     dyoung   1846:        }
1.177     ad       1847:        KASSERT(solocked(so));
                   1848:        return error;
1.142     dyoung   1849: }
1.1       cgd      1850:
1.142     dyoung   1851: int
1.171     plunky   1852: sosetopt(struct socket *so, struct sockopt *sopt)
1.142     dyoung   1853: {
                   1854:        int error, prerr;
1.1       cgd      1855:
1.177     ad       1856:        if (sopt->sopt_level == SOL_SOCKET) {
1.171     plunky   1857:                error = sosetopt1(so, sopt);
1.177     ad       1858:                KASSERT(solocked(so));
                   1859:        } else {
1.142     dyoung   1860:                error = ENOPROTOOPT;
1.177     ad       1861:                solock(so);
                   1862:        }
1.1       cgd      1863:
1.142     dyoung   1864:        if ((error == 0 || error == ENOPROTOOPT) &&
                   1865:            so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
                   1866:                /* give the protocol stack a shot */
1.171     plunky   1867:                prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142     dyoung   1868:                if (prerr == 0)
                   1869:                        error = 0;
                   1870:                else if (prerr != ENOPROTOOPT)
                   1871:                        error = prerr;
1.171     plunky   1872:        }
1.160     ad       1873:        sounlock(so);
1.142     dyoung   1874:        return error;
1.1       cgd      1875: }
                   1876:
1.171     plunky   1877: /*
                   1878:  * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
                   1879:  */
                   1880: int
                   1881: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
                   1882:     const void *val, size_t valsize)
                   1883: {
                   1884:        struct sockopt sopt;
                   1885:        int error;
                   1886:
                   1887:        KASSERT(valsize == 0 || val != NULL);
                   1888:
                   1889:        sockopt_init(&sopt, level, name, valsize);
                   1890:        sockopt_set(&sopt, val, valsize);
                   1891:
                   1892:        error = sosetopt(so, &sopt);
                   1893:
                   1894:        sockopt_destroy(&sopt);
                   1895:
                   1896:        return error;
                   1897: }
                   1898:
                   1899: /*
                   1900:  * internal get SOL_SOCKET options
                   1901:  */
                   1902: static int
                   1903: sogetopt1(struct socket *so, struct sockopt *sopt)
                   1904: {
1.179     christos 1905:        int error, optval, opt;
1.171     plunky   1906:        struct linger l;
                   1907:        struct timeval tv;
                   1908:
1.179     christos 1909:        switch ((opt = sopt->sopt_name)) {
1.171     plunky   1910:
                   1911:        case SO_ACCEPTFILTER:
1.177     ad       1912:                error = accept_filt_getopt(so, sopt);
1.171     plunky   1913:                break;
                   1914:
                   1915:        case SO_LINGER:
                   1916:                l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
                   1917:                l.l_linger = so->so_linger;
                   1918:
                   1919:                error = sockopt_set(sopt, &l, sizeof(l));
                   1920:                break;
                   1921:
                   1922:        case SO_USELOOPBACK:
                   1923:        case SO_DONTROUTE:
                   1924:        case SO_DEBUG:
                   1925:        case SO_KEEPALIVE:
                   1926:        case SO_REUSEADDR:
                   1927:        case SO_REUSEPORT:
                   1928:        case SO_BROADCAST:
                   1929:        case SO_OOBINLINE:
                   1930:        case SO_TIMESTAMP:
1.207     christos 1931:        case SO_NOSIGPIPE:
1.184     christos 1932: #ifdef SO_OTIMESTAMP
                   1933:        case SO_OTIMESTAMP:
                   1934: #endif
1.215.4.4! rmind    1935:        case SO_ACCEPTCONN:
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);
1.212     pooka    2393: static int sysctl_kern_sbmax(SYSCTLFN_PROTO);
1.94      yamt     2394:
                   2395: /*
                   2396:  * sysctl helper routine for kern.somaxkva.  ensures that the given
                   2397:  * value is not too small.
                   2398:  * (XXX should we maybe make sure it's not too large as well?)
                   2399:  */
                   2400: static int
                   2401: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
                   2402: {
                   2403:        int error, new_somaxkva;
                   2404:        struct sysctlnode node;
                   2405:
                   2406:        new_somaxkva = somaxkva;
                   2407:        node = *rnode;
                   2408:        node.sysctl_data = &new_somaxkva;
                   2409:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2410:        if (error || newp == NULL)
                   2411:                return (error);
                   2412:
                   2413:        if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
                   2414:                return (EINVAL);
                   2415:
1.136     ad       2416:        mutex_enter(&so_pendfree_lock);
1.94      yamt     2417:        somaxkva = new_somaxkva;
1.136     ad       2418:        cv_broadcast(&socurkva_cv);
                   2419:        mutex_exit(&so_pendfree_lock);
1.94      yamt     2420:
                   2421:        return (error);
                   2422: }
                   2423:
1.212     pooka    2424: /*
                   2425:  * sysctl helper routine for kern.sbmax. Basically just ensures that
                   2426:  * any new value is not too small.
                   2427:  */
                   2428: static int
                   2429: sysctl_kern_sbmax(SYSCTLFN_ARGS)
                   2430: {
                   2431:        int error, new_sbmax;
                   2432:        struct sysctlnode node;
                   2433:
                   2434:        new_sbmax = sb_max;
                   2435:        node = *rnode;
                   2436:        node.sysctl_data = &new_sbmax;
                   2437:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2438:        if (error || newp == NULL)
                   2439:                return (error);
                   2440:
                   2441:        KERNEL_LOCK(1, NULL);
                   2442:        error = sb_max_set(new_sbmax);
                   2443:        KERNEL_UNLOCK_ONE(NULL);
                   2444:
                   2445:        return (error);
                   2446: }
                   2447:
1.178     pooka    2448: static void
1.212     pooka    2449: sysctl_kern_socket_setup(void)
1.94      yamt     2450: {
                   2451:
1.178     pooka    2452:        KASSERT(socket_sysctllog == NULL);
1.97      atatat   2453:
1.178     pooka    2454:        sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97      atatat   2455:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103     atatat   2456:                       CTLTYPE_INT, "somaxkva",
                   2457:                       SYSCTL_DESCR("Maximum amount of kernel memory to be "
                   2458:                                    "used for socket buffers"),
1.94      yamt     2459:                       sysctl_kern_somaxkva, 0, NULL, 0,
                   2460:                       CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
1.212     pooka    2461:
                   2462:        sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
                   2463:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   2464:                       CTLTYPE_INT, "sbmax",
                   2465:                       SYSCTL_DESCR("Maximum socket buffer size"),
                   2466:                       sysctl_kern_sbmax, 0, NULL, 0,
                   2467:                       CTL_KERN, KERN_SBMAX, CTL_EOL);
1.94      yamt     2468: }

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