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Annotation of src/sys/kern/uipc_socket.c, Revision 1.215.4.3

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:
1.215.4.2  rmind     426:                if (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
1.215.4.1  rmind     575: fsocreate(int domain, struct socket **sop, int type, int protocol, 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:
                    586:        flags = type & SOCK_FLAGS_MASK;
1.204     christos  587:        fd_set_exclose(l, fd, (flags & SOCK_CLOEXEC) != 0);
1.207     christos  588:        fp->f_flag = FREAD|FWRITE|((flags & SOCK_NONBLOCK) ? FNONBLOCK : 0)|
                    589:            ((flags & SOCK_NOSIGPIPE) ? FNOSIGPIPE : 0);
1.142     dyoung    590:        fp->f_type = DTYPE_SOCKET;
                    591:        fp->f_ops = &socketops;
1.215.4.1  rmind     592:
                    593:        type &= ~SOCK_FLAGS_MASK;
1.160     ad        594:        error = socreate(domain, &so, type, protocol, l, NULL);
1.142     dyoung    595:        if (error != 0) {
1.155     ad        596:                fd_abort(curproc, fp, fd);
1.215.4.1  rmind     597:                return error;
1.142     dyoung    598:        }
1.215.4.1  rmind     599:        if (flags & SOCK_NONBLOCK) {
                    600:                so->so_state |= SS_NBIO;
                    601:        }
                    602:
                    603:        fp->f_data = so;
                    604:        fd_affix(curproc, fp, fd);
                    605:        if (sop != NULL) {
                    606:                *sop = so;
                    607:        }
                    608:        *fdout = fd;
1.142     dyoung    609:        return error;
                    610: }
                    611:
1.215.4.3! rmind     612: void
        !           613: soref(struct socket *so)
        !           614: {
        !           615:        atomic_inc_uint(&so->so_refcnt);
        !           616: }
        !           617:
        !           618: void
        !           619: sounref(struct socket *so)
        !           620: {
        !           621:        if (atomic_dec_uint_nv(&so->so_refcnt) > 0) {
        !           622:                return;
        !           623:        }
        !           624:        soput(so);
        !           625: }
        !           626:
1.3       andrew    627: int
1.190     dyoung    628: sofamily(const struct socket *so)
                    629: {
                    630:        const struct protosw *pr;
                    631:        const struct domain *dom;
                    632:
                    633:        if ((pr = so->so_proto) == NULL)
                    634:                return AF_UNSPEC;
                    635:        if ((dom = pr->pr_domain) == NULL)
                    636:                return AF_UNSPEC;
                    637:        return dom->dom_family;
                    638: }
                    639:
                    640: int
1.114     christos  641: sobind(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1       cgd       642: {
1.215.4.1  rmind     643:        int error;
1.1       cgd       644:
1.160     ad        645:        solock(so);
1.215.4.1  rmind     646:        error = (*so->so_proto->pr_usrreqs->pr_generic)(so,
                    647:            PRU_BIND, NULL, nam, NULL, l);
1.160     ad        648:        sounlock(so);
1.140     dyoung    649:        return error;
1.1       cgd       650: }
                    651:
1.3       andrew    652: int
1.150     elad      653: solisten(struct socket *so, int backlog, struct lwp *l)
1.1       cgd       654: {
1.215.4.1  rmind     655:        int error;
1.1       cgd       656:
1.160     ad        657:        solock(so);
1.158     ad        658:        if ((so->so_state & (SS_ISCONNECTED | SS_ISCONNECTING |
1.163     ad        659:            SS_ISDISCONNECTING)) != 0) {
1.215.4.1  rmind     660:                sounlock(so);
1.210     matt      661:                return (EINVAL);
1.163     ad        662:        }
1.215.4.1  rmind     663:        error = (*so->so_proto->pr_usrreqs->pr_generic)(so, PRU_LISTEN, NULL,
1.150     elad      664:            NULL, NULL, l);
1.140     dyoung    665:        if (error != 0) {
1.160     ad        666:                sounlock(so);
1.140     dyoung    667:                return error;
1.1       cgd       668:        }
1.63      matt      669:        if (TAILQ_EMPTY(&so->so_q))
1.1       cgd       670:                so->so_options |= SO_ACCEPTCONN;
                    671:        if (backlog < 0)
                    672:                backlog = 0;
1.49      jonathan  673:        so->so_qlimit = min(backlog, somaxconn);
1.160     ad        674:        sounlock(so);
1.140     dyoung    675:        return 0;
1.1       cgd       676: }
                    677:
1.21      christos  678: void
1.54      lukem     679: sofree(struct socket *so)
1.1       cgd       680: {
                    681:
1.160     ad        682:        KASSERT(solocked(so));
                    683:
                    684:        if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) {
                    685:                sounlock(so);
1.1       cgd       686:                return;
1.160     ad        687:        }
1.43      mycroft   688:        if (so->so_head) {
                    689:                /*
                    690:                 * We must not decommission a socket that's on the accept(2)
                    691:                 * queue.  If we do, then accept(2) may hang after select(2)
                    692:                 * indicated that the listening socket was ready.
                    693:                 */
1.160     ad        694:                if (!soqremque(so, 0)) {
                    695:                        sounlock(so);
1.43      mycroft   696:                        return;
1.160     ad        697:                }
1.43      mycroft   698:        }
1.98      christos  699:        if (so->so_rcv.sb_hiwat)
1.110     christos  700:                (void)chgsbsize(so->so_uidinfo, &so->so_rcv.sb_hiwat, 0,
1.98      christos  701:                    RLIM_INFINITY);
                    702:        if (so->so_snd.sb_hiwat)
1.110     christos  703:                (void)chgsbsize(so->so_uidinfo, &so->so_snd.sb_hiwat, 0,
1.98      christos  704:                    RLIM_INFINITY);
                    705:        sbrelease(&so->so_snd, so);
1.160     ad        706:        KASSERT(!cv_has_waiters(&so->so_cv));
                    707:        KASSERT(!cv_has_waiters(&so->so_rcv.sb_cv));
                    708:        KASSERT(!cv_has_waiters(&so->so_snd.sb_cv));
1.1       cgd       709:        sorflush(so);
1.177     ad        710:        /* Remove acccept filter if one is present. */
1.170     tls       711:        if (so->so_accf != NULL)
1.177     ad        712:                (void)accept_filt_clear(so);
1.160     ad        713:        sounlock(so);
1.215.4.3! rmind     714:
        !           715:        /* Will soput() if the last reference. */
        !           716:        sounref(so);
1.1       cgd       717: }
                    718:
                    719: /*
1.215.4.1  rmind     720:  * soclose: close a socket on last file table reference removal.
                    721:  * Initiate disconnect if connected.  Free socket when disconnect complete.
1.1       cgd       722:  */
1.3       andrew    723: int
1.54      lukem     724: soclose(struct socket *so)
1.1       cgd       725: {
1.215.4.1  rmind     726:        struct socket *so2;
                    727:        int error;
1.1       cgd       728:
1.54      lukem     729:        error = 0;
1.160     ad        730:        solock(so);
1.1       cgd       731:        if (so->so_options & SO_ACCEPTCONN) {
1.172     ad        732:                for (;;) {
                    733:                        if ((so2 = TAILQ_FIRST(&so->so_q0)) != 0) {
1.160     ad        734:                                KASSERT(solocked2(so, so2));
                    735:                                (void) soqremque(so2, 0);
                    736:                                /* soabort drops the lock. */
                    737:                                (void) soabort(so2);
                    738:                                solock(so);
1.172     ad        739:                                continue;
1.160     ad        740:                        }
1.172     ad        741:                        if ((so2 = TAILQ_FIRST(&so->so_q)) != 0) {
1.160     ad        742:                                KASSERT(solocked2(so, so2));
                    743:                                (void) soqremque(so2, 1);
                    744:                                /* soabort drops the lock. */
                    745:                                (void) soabort(so2);
                    746:                                solock(so);
1.172     ad        747:                                continue;
1.160     ad        748:                        }
1.172     ad        749:                        break;
                    750:                }
1.1       cgd       751:        }
1.215.4.1  rmind     752:        if (so->so_pcb == NULL)
1.1       cgd       753:                goto discard;
                    754:        if (so->so_state & SS_ISCONNECTED) {
                    755:                if ((so->so_state & SS_ISDISCONNECTING) == 0) {
                    756:                        error = sodisconnect(so);
                    757:                        if (error)
                    758:                                goto drop;
                    759:                }
                    760:                if (so->so_options & SO_LINGER) {
1.206     christos  761:                        if ((so->so_state & (SS_ISDISCONNECTING|SS_NBIO)) ==
                    762:                            (SS_ISDISCONNECTING|SS_NBIO))
1.1       cgd       763:                                goto drop;
1.21      christos  764:                        while (so->so_state & SS_ISCONNECTED) {
1.185     yamt      765:                                error = sowait(so, true, so->so_linger * hz);
1.21      christos  766:                                if (error)
1.1       cgd       767:                                        break;
1.21      christos  768:                        }
1.1       cgd       769:                }
                    770:        }
1.54      lukem     771:  drop:
1.1       cgd       772:        if (so->so_pcb) {
1.215.4.1  rmind     773:                (*so->so_proto->pr_usrreqs->pr_detach)(so);
1.1       cgd       774:        }
1.54      lukem     775:  discard:
1.215.4.1  rmind     776:        KASSERT((so->so_state & SS_NOFDREF) == 0);
1.198     elad      777:        kauth_cred_free(so->so_cred);
1.1       cgd       778:        so->so_state |= SS_NOFDREF;
                    779:        sofree(so);
1.215.4.1  rmind     780:        return error;
1.1       cgd       781: }
                    782:
                    783: /*
1.160     ad        784:  * Must be called with the socket locked..  Will return with it unlocked.
1.1       cgd       785:  */
1.3       andrew    786: int
1.54      lukem     787: soabort(struct socket *so)
1.1       cgd       788: {
1.161     ad        789:        u_int refs;
1.139     yamt      790:        int error;
1.215.4.3! rmind     791:
1.160     ad        792:        KASSERT(solocked(so));
                    793:        KASSERT(so->so_head == NULL);
1.1       cgd       794:
1.215.4.3! rmind     795:        soref(so);
1.215.4.1  rmind     796:        error = (*so->so_proto->pr_usrreqs->pr_generic)(so,
                    797:            PRU_ABORT, NULL, NULL, NULL, NULL);
1.215.4.3! rmind     798:        refs = so->so_refcnt;
        !           799:        sounref(so);
        !           800:
        !           801:        /* XXX: Fix PRU_ABORT to behave consistently. */
        !           802:        if (error || refs == 1) {
1.139     yamt      803:                sofree(so);
1.160     ad        804:        } else {
                    805:                sounlock(so);
1.139     yamt      806:        }
1.215.4.3! rmind     807:        sounref(so);
1.139     yamt      808:        return error;
1.1       cgd       809: }
                    810:
1.3       andrew    811: int
1.54      lukem     812: soaccept(struct socket *so, struct mbuf *nam)
1.1       cgd       813: {
1.160     ad        814:        int     error;
                    815:
                    816:        KASSERT(solocked(so));
1.1       cgd       817:
1.54      lukem     818:        error = 0;
1.215.4.1  rmind     819:        KASSERT((so->so_state & SS_NOFDREF) != 0);
1.1       cgd       820:        so->so_state &= ~SS_NOFDREF;
1.215.4.1  rmind     821:
1.55      thorpej   822:        if ((so->so_state & SS_ISDISCONNECTED) == 0 ||
                    823:            (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0)
1.215.4.1  rmind     824:                error = (*so->so_proto->pr_usrreqs->pr_generic)(so,
                    825:                    PRU_ACCEPT, NULL, nam, NULL, NULL);
1.41      mycroft   826:        else
1.53      itojun    827:                error = ECONNABORTED;
1.52      itojun    828:
1.1       cgd       829:        return (error);
                    830: }
                    831:
1.3       andrew    832: int
1.114     christos  833: soconnect(struct socket *so, struct mbuf *nam, struct lwp *l)
1.1       cgd       834: {
1.215.4.1  rmind     835:        int error;
1.160     ad        836:
                    837:        KASSERT(solocked(so));
1.1       cgd       838:
                    839:        if (so->so_options & SO_ACCEPTCONN)
                    840:                return (EOPNOTSUPP);
                    841:        /*
                    842:         * If protocol is connection-based, can only connect once.
                    843:         * Otherwise, if connected, try to disconnect first.
                    844:         * This allows user to disconnect by connecting to, e.g.,
                    845:         * a null address.
                    846:         */
                    847:        if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) &&
                    848:            ((so->so_proto->pr_flags & PR_CONNREQUIRED) ||
                    849:            (error = sodisconnect(so))))
                    850:                error = EISCONN;
                    851:        else
1.215.4.1  rmind     852:                error = (*so->so_proto->pr_usrreqs->pr_generic)(so,
                    853:                    PRU_CONNECT, NULL, nam, NULL, l);
                    854:
                    855:        return error;
1.1       cgd       856: }
                    857:
1.3       andrew    858: int
1.54      lukem     859: soconnect2(struct socket *so1, struct socket *so2)
1.1       cgd       860: {
1.160     ad        861:        int     error;
                    862:
                    863:        KASSERT(solocked2(so1, so2));
1.1       cgd       864:
1.215.4.1  rmind     865:        error = (*so1->so_proto->pr_usrreqs->pr_generic)(so1, PRU_CONNECT2,
1.140     dyoung    866:            NULL, (struct mbuf *)so2, NULL, NULL);
1.1       cgd       867:        return (error);
                    868: }
                    869:
1.3       andrew    870: int
1.54      lukem     871: sodisconnect(struct socket *so)
1.1       cgd       872: {
1.160     ad        873:        int     error;
                    874:
                    875:        KASSERT(solocked(so));
1.1       cgd       876:
                    877:        if ((so->so_state & SS_ISCONNECTED) == 0) {
                    878:                error = ENOTCONN;
1.160     ad        879:        } else if (so->so_state & SS_ISDISCONNECTING) {
1.1       cgd       880:                error = EALREADY;
1.160     ad        881:        } else {
1.215.4.1  rmind     882:                error = (*so->so_proto->pr_usrreqs->pr_generic)(so,
                    883:                    PRU_DISCONNECT, NULL, NULL, NULL, NULL);
1.1       cgd       884:        }
                    885:        return (error);
                    886: }
                    887:
1.15      mycroft   888: #define        SBLOCKWAIT(f)   (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK)
1.1       cgd       889: /*
                    890:  * Send on a socket.
                    891:  * If send must go all at once and message is larger than
                    892:  * send buffering, then hard error.
                    893:  * Lock against other senders.
                    894:  * If must go all at once and not enough room now, then
                    895:  * inform user that this would block and do nothing.
                    896:  * Otherwise, if nonblocking, send as much as possible.
                    897:  * The data to be sent is described by "uio" if nonzero,
                    898:  * otherwise by the mbuf chain "top" (which must be null
                    899:  * if uio is not).  Data provided in mbuf chain must be small
                    900:  * enough to send all at once.
                    901:  *
                    902:  * Returns nonzero on error, timeout or signal; callers
                    903:  * must check for short counts if EINTR/ERESTART are returned.
                    904:  * Data and control buffers are freed on return.
                    905:  */
1.3       andrew    906: int
1.54      lukem     907: sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top,
1.114     christos  908:        struct mbuf *control, int flags, struct lwp *l)
1.1       cgd       909: {
1.54      lukem     910:        struct mbuf     **mp, *m;
1.58      jdolecek  911:        long            space, len, resid, clen, mlen;
                    912:        int             error, s, dontroute, atomic;
1.196     dsl       913:        short           wakeup_state = 0;
1.54      lukem     914:
1.160     ad        915:        clen = 0;
1.64      thorpej   916:
1.160     ad        917:        /*
                    918:         * solock() provides atomicity of access.  splsoftnet() prevents
                    919:         * protocol processing soft interrupts from interrupting us and
                    920:         * blocking (expensive).
                    921:         */
                    922:        s = splsoftnet();
                    923:        solock(so);
1.54      lukem     924:        atomic = sosendallatonce(so) || top;
1.1       cgd       925:        if (uio)
                    926:                resid = uio->uio_resid;
                    927:        else
                    928:                resid = top->m_pkthdr.len;
1.7       cgd       929:        /*
                    930:         * In theory resid should be unsigned.
                    931:         * However, space must be signed, as it might be less than 0
                    932:         * if we over-committed, and we must use a signed comparison
                    933:         * of space and resid.  On the other hand, a negative resid
                    934:         * causes us to loop sending 0-length segments to the protocol.
                    935:         */
1.29      mycroft   936:        if (resid < 0) {
                    937:                error = EINVAL;
                    938:                goto out;
                    939:        }
1.1       cgd       940:        dontroute =
                    941:            (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 &&
                    942:            (so->so_proto->pr_flags & PR_ATOMIC);
1.165     christos  943:        l->l_ru.ru_msgsnd++;
1.1       cgd       944:        if (control)
                    945:                clen = control->m_len;
1.54      lukem     946:  restart:
1.21      christos  947:        if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0)
1.1       cgd       948:                goto out;
                    949:        do {
1.160     ad        950:                if (so->so_state & SS_CANTSENDMORE) {
                    951:                        error = EPIPE;
                    952:                        goto release;
                    953:                }
1.48      thorpej   954:                if (so->so_error) {
                    955:                        error = so->so_error;
                    956:                        so->so_error = 0;
                    957:                        goto release;
                    958:                }
1.1       cgd       959:                if ((so->so_state & SS_ISCONNECTED) == 0) {
                    960:                        if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
                    961:                                if ((so->so_state & SS_ISCONFIRMING) == 0 &&
1.160     ad        962:                                    !(resid == 0 && clen != 0)) {
                    963:                                        error = ENOTCONN;
                    964:                                        goto release;
                    965:                                }
                    966:                        } else if (addr == 0) {
                    967:                                error = EDESTADDRREQ;
                    968:                                goto release;
                    969:                        }
1.1       cgd       970:                }
                    971:                space = sbspace(&so->so_snd);
                    972:                if (flags & MSG_OOB)
                    973:                        space += 1024;
1.21      christos  974:                if ((atomic && resid > so->so_snd.sb_hiwat) ||
1.160     ad        975:                    clen > so->so_snd.sb_hiwat) {
                    976:                        error = EMSGSIZE;
                    977:                        goto release;
                    978:                }
1.96      mycroft   979:                if (space < resid + clen &&
1.1       cgd       980:                    (atomic || space < so->so_snd.sb_lowat || space < clen)) {
1.206     christos  981:                        if ((so->so_state & SS_NBIO) || (flags & MSG_NBIO)) {
1.160     ad        982:                                error = EWOULDBLOCK;
                    983:                                goto release;
                    984:                        }
1.1       cgd       985:                        sbunlock(&so->so_snd);
1.196     dsl       986:                        if (wakeup_state & SS_RESTARTSYS) {
                    987:                                error = ERESTART;
                    988:                                goto out;
                    989:                        }
1.1       cgd       990:                        error = sbwait(&so->so_snd);
                    991:                        if (error)
                    992:                                goto out;
1.196     dsl       993:                        wakeup_state = so->so_state;
1.1       cgd       994:                        goto restart;
                    995:                }
1.196     dsl       996:                wakeup_state = 0;
1.1       cgd       997:                mp = &top;
                    998:                space -= clen;
                    999:                do {
1.45      tv       1000:                        if (uio == NULL) {
                   1001:                                /*
                   1002:                                 * Data is prepackaged in "top".
                   1003:                                 */
                   1004:                                resid = 0;
                   1005:                                if (flags & MSG_EOR)
                   1006:                                        top->m_flags |= M_EOR;
                   1007:                        } else do {
1.160     ad       1008:                                sounlock(so);
                   1009:                                splx(s);
1.144     dyoung   1010:                                if (top == NULL) {
1.78      matt     1011:                                        m = m_gethdr(M_WAIT, MT_DATA);
1.45      tv       1012:                                        mlen = MHLEN;
                   1013:                                        m->m_pkthdr.len = 0;
1.140     dyoung   1014:                                        m->m_pkthdr.rcvif = NULL;
1.45      tv       1015:                                } else {
1.78      matt     1016:                                        m = m_get(M_WAIT, MT_DATA);
1.45      tv       1017:                                        mlen = MLEN;
                   1018:                                }
1.78      matt     1019:                                MCLAIM(m, so->so_snd.sb_mowner);
1.121     yamt     1020:                                if (sock_loan_thresh >= 0 &&
                   1021:                                    uio->uio_iov->iov_len >= sock_loan_thresh &&
                   1022:                                    space >= sock_loan_thresh &&
1.64      thorpej  1023:                                    (len = sosend_loan(so, uio, m,
                   1024:                                                       space)) != 0) {
                   1025:                                        SOSEND_COUNTER_INCR(&sosend_loan_big);
                   1026:                                        space -= len;
                   1027:                                        goto have_data;
                   1028:                                }
1.45      tv       1029:                                if (resid >= MINCLSIZE && space >= MCLBYTES) {
1.64      thorpej  1030:                                        SOSEND_COUNTER_INCR(&sosend_copy_big);
1.201     oki      1031:                                        m_clget(m, M_DONTWAIT);
1.45      tv       1032:                                        if ((m->m_flags & M_EXT) == 0)
                   1033:                                                goto nopages;
                   1034:                                        mlen = MCLBYTES;
                   1035:                                        if (atomic && top == 0) {
1.58      jdolecek 1036:                                                len = lmin(MCLBYTES - max_hdr,
1.54      lukem    1037:                                                    resid);
1.45      tv       1038:                                                m->m_data += max_hdr;
                   1039:                                        } else
1.58      jdolecek 1040:                                                len = lmin(MCLBYTES, resid);
1.45      tv       1041:                                        space -= len;
                   1042:                                } else {
1.64      thorpej  1043:  nopages:
                   1044:                                        SOSEND_COUNTER_INCR(&sosend_copy_small);
1.58      jdolecek 1045:                                        len = lmin(lmin(mlen, resid), space);
1.45      tv       1046:                                        space -= len;
                   1047:                                        /*
                   1048:                                         * For datagram protocols, leave room
                   1049:                                         * for protocol headers in first mbuf.
                   1050:                                         */
                   1051:                                        if (atomic && top == 0 && len < mlen)
                   1052:                                                MH_ALIGN(m, len);
                   1053:                                }
1.144     dyoung   1054:                                error = uiomove(mtod(m, void *), (int)len, uio);
1.64      thorpej  1055:  have_data:
1.45      tv       1056:                                resid = uio->uio_resid;
                   1057:                                m->m_len = len;
                   1058:                                *mp = m;
                   1059:                                top->m_pkthdr.len += len;
1.160     ad       1060:                                s = splsoftnet();
                   1061:                                solock(so);
1.144     dyoung   1062:                                if (error != 0)
1.45      tv       1063:                                        goto release;
                   1064:                                mp = &m->m_next;
                   1065:                                if (resid <= 0) {
                   1066:                                        if (flags & MSG_EOR)
                   1067:                                                top->m_flags |= M_EOR;
                   1068:                                        break;
                   1069:                                }
                   1070:                        } while (space > 0 && atomic);
1.108     perry    1071:
1.160     ad       1072:                        if (so->so_state & SS_CANTSENDMORE) {
                   1073:                                error = EPIPE;
                   1074:                                goto release;
                   1075:                        }
1.45      tv       1076:                        if (dontroute)
                   1077:                                so->so_options |= SO_DONTROUTE;
                   1078:                        if (resid > 0)
                   1079:                                so->so_state |= SS_MORETOCOME;
1.215.4.1  rmind    1080:                        error = (*so->so_proto->pr_usrreqs->pr_generic)(so,
1.46      sommerfe 1081:                            (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND,
1.160     ad       1082:                            top, addr, control, curlwp);
1.45      tv       1083:                        if (dontroute)
                   1084:                                so->so_options &= ~SO_DONTROUTE;
                   1085:                        if (resid > 0)
                   1086:                                so->so_state &= ~SS_MORETOCOME;
                   1087:                        clen = 0;
1.144     dyoung   1088:                        control = NULL;
                   1089:                        top = NULL;
1.45      tv       1090:                        mp = &top;
1.144     dyoung   1091:                        if (error != 0)
1.1       cgd      1092:                                goto release;
                   1093:                } while (resid && space > 0);
                   1094:        } while (resid);
                   1095:
1.54      lukem    1096:  release:
1.1       cgd      1097:        sbunlock(&so->so_snd);
1.54      lukem    1098:  out:
1.160     ad       1099:        sounlock(so);
                   1100:        splx(s);
1.1       cgd      1101:        if (top)
                   1102:                m_freem(top);
                   1103:        if (control)
                   1104:                m_freem(control);
                   1105:        return (error);
                   1106: }
                   1107:
                   1108: /*
1.159     ad       1109:  * Following replacement or removal of the first mbuf on the first
                   1110:  * mbuf chain of a socket buffer, push necessary state changes back
                   1111:  * into the socket buffer so that other consumers see the values
                   1112:  * consistently.  'nextrecord' is the callers locally stored value of
                   1113:  * the original value of sb->sb_mb->m_nextpkt which must be restored
                   1114:  * when the lead mbuf changes.  NOTE: 'nextrecord' may be NULL.
                   1115:  */
                   1116: static void
                   1117: sbsync(struct sockbuf *sb, struct mbuf *nextrecord)
                   1118: {
                   1119:
1.160     ad       1120:        KASSERT(solocked(sb->sb_so));
                   1121:
1.159     ad       1122:        /*
                   1123:         * First, update for the new value of nextrecord.  If necessary,
                   1124:         * make it the first record.
                   1125:         */
                   1126:        if (sb->sb_mb != NULL)
                   1127:                sb->sb_mb->m_nextpkt = nextrecord;
                   1128:        else
                   1129:                sb->sb_mb = nextrecord;
                   1130:
                   1131:         /*
                   1132:          * Now update any dependent socket buffer fields to reflect
                   1133:          * the new state.  This is an inline of SB_EMPTY_FIXUP, with
                   1134:          * the addition of a second clause that takes care of the
                   1135:          * case where sb_mb has been updated, but remains the last
                   1136:          * record.
                   1137:          */
                   1138:         if (sb->sb_mb == NULL) {
                   1139:                 sb->sb_mbtail = NULL;
                   1140:                 sb->sb_lastrecord = NULL;
                   1141:         } else if (sb->sb_mb->m_nextpkt == NULL)
                   1142:                 sb->sb_lastrecord = sb->sb_mb;
                   1143: }
                   1144:
                   1145: /*
1.1       cgd      1146:  * Implement receive operations on a socket.
                   1147:  * We depend on the way that records are added to the sockbuf
                   1148:  * by sbappend*.  In particular, each record (mbufs linked through m_next)
                   1149:  * must begin with an address if the protocol so specifies,
                   1150:  * followed by an optional mbuf or mbufs containing ancillary data,
                   1151:  * and then zero or more mbufs of data.
                   1152:  * In order to avoid blocking network interrupts for the entire time here,
                   1153:  * we splx() while doing the actual copy to user space.
                   1154:  * Although the sockbuf is locked, new data may still be appended,
                   1155:  * and thus we must maintain consistency of the sockbuf during that time.
                   1156:  *
                   1157:  * The caller may receive the data as a single mbuf chain by supplying
                   1158:  * an mbuf **mp0 for use in returning the chain.  The uio is then used
                   1159:  * only for the count in uio_resid.
                   1160:  */
1.3       andrew   1161: int
1.54      lukem    1162: soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio,
                   1163:        struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
1.1       cgd      1164: {
1.116     yamt     1165:        struct lwp *l = curlwp;
1.160     ad       1166:        struct mbuf     *m, **mp, *mt;
1.211     chs      1167:        size_t len, offset, moff, orig_resid;
                   1168:        int atomic, flags, error, s, type;
1.99      matt     1169:        const struct protosw    *pr;
1.54      lukem    1170:        struct mbuf     *nextrecord;
1.67      he       1171:        int             mbuf_removed = 0;
1.146     dyoung   1172:        const struct domain *dom;
1.196     dsl      1173:        short           wakeup_state = 0;
1.64      thorpej  1174:
1.54      lukem    1175:        pr = so->so_proto;
1.146     dyoung   1176:        atomic = pr->pr_flags & PR_ATOMIC;
                   1177:        dom = pr->pr_domain;
1.1       cgd      1178:        mp = mp0;
1.54      lukem    1179:        type = 0;
                   1180:        orig_resid = uio->uio_resid;
1.102     jonathan 1181:
1.144     dyoung   1182:        if (paddr != NULL)
                   1183:                *paddr = NULL;
                   1184:        if (controlp != NULL)
                   1185:                *controlp = NULL;
                   1186:        if (flagsp != NULL)
1.1       cgd      1187:                flags = *flagsp &~ MSG_EOR;
                   1188:        else
                   1189:                flags = 0;
1.66      enami    1190:
1.1       cgd      1191:        if (flags & MSG_OOB) {
                   1192:                m = m_get(M_WAIT, MT_DATA);
1.160     ad       1193:                solock(so);
1.215.4.1  rmind    1194:                error = (*pr->pr_usrreqs->pr_generic)(so, PRU_RCVOOB, m,
1.140     dyoung   1195:                    (struct mbuf *)(long)(flags & MSG_PEEK), NULL, l);
1.160     ad       1196:                sounlock(so);
1.1       cgd      1197:                if (error)
                   1198:                        goto bad;
                   1199:                do {
1.134     christos 1200:                        error = uiomove(mtod(m, void *),
1.211     chs      1201:                            MIN(uio->uio_resid, m->m_len), uio);
1.1       cgd      1202:                        m = m_free(m);
1.144     dyoung   1203:                } while (uio->uio_resid > 0 && error == 0 && m);
1.54      lukem    1204:  bad:
1.144     dyoung   1205:                if (m != NULL)
1.1       cgd      1206:                        m_freem(m);
1.144     dyoung   1207:                return error;
1.1       cgd      1208:        }
1.144     dyoung   1209:        if (mp != NULL)
1.140     dyoung   1210:                *mp = NULL;
1.160     ad       1211:
                   1212:        /*
                   1213:         * solock() provides atomicity of access.  splsoftnet() prevents
                   1214:         * protocol processing soft interrupts from interrupting us and
                   1215:         * blocking (expensive).
                   1216:         */
                   1217:        s = splsoftnet();
                   1218:        solock(so);
1.1       cgd      1219:        if (so->so_state & SS_ISCONFIRMING && uio->uio_resid)
1.215.4.1  rmind    1220:                (*pr->pr_usrreqs->pr_generic)(so, PRU_RCVD, NULL, NULL, NULL, l);
1.1       cgd      1221:
1.54      lukem    1222:  restart:
1.160     ad       1223:        if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) {
                   1224:                sounlock(so);
                   1225:                splx(s);
1.144     dyoung   1226:                return error;
1.160     ad       1227:        }
1.1       cgd      1228:
                   1229:        m = so->so_rcv.sb_mb;
                   1230:        /*
                   1231:         * If we have less data than requested, block awaiting more
                   1232:         * (subject to any timeout) if:
1.15      mycroft  1233:         *   1. the current count is less than the low water mark,
1.1       cgd      1234:         *   2. MSG_WAITALL is set, and it is possible to do the entire
1.15      mycroft  1235:         *      receive operation at once if we block (resid <= hiwat), or
                   1236:         *   3. MSG_DONTWAIT is not set.
1.1       cgd      1237:         * If MSG_WAITALL is set but resid is larger than the receive buffer,
                   1238:         * we have to do the receive in sections, and thus risk returning
                   1239:         * a short count if a timeout or signal occurs after we start.
                   1240:         */
1.144     dyoung   1241:        if (m == NULL ||
                   1242:            ((flags & MSG_DONTWAIT) == 0 &&
                   1243:             so->so_rcv.sb_cc < uio->uio_resid &&
                   1244:             (so->so_rcv.sb_cc < so->so_rcv.sb_lowat ||
                   1245:              ((flags & MSG_WAITALL) &&
                   1246:               uio->uio_resid <= so->so_rcv.sb_hiwat)) &&
1.146     dyoung   1247:             m->m_nextpkt == NULL && !atomic)) {
1.1       cgd      1248: #ifdef DIAGNOSTIC
1.144     dyoung   1249:                if (m == NULL && so->so_rcv.sb_cc)
1.1       cgd      1250:                        panic("receive 1");
                   1251: #endif
                   1252:                if (so->so_error) {
1.144     dyoung   1253:                        if (m != NULL)
1.15      mycroft  1254:                                goto dontblock;
1.1       cgd      1255:                        error = so->so_error;
                   1256:                        if ((flags & MSG_PEEK) == 0)
                   1257:                                so->so_error = 0;
                   1258:                        goto release;
                   1259:                }
                   1260:                if (so->so_state & SS_CANTRCVMORE) {
1.144     dyoung   1261:                        if (m != NULL)
1.15      mycroft  1262:                                goto dontblock;
1.1       cgd      1263:                        else
                   1264:                                goto release;
                   1265:                }
1.144     dyoung   1266:                for (; m != NULL; m = m->m_next)
1.1       cgd      1267:                        if (m->m_type == MT_OOBDATA  || (m->m_flags & M_EOR)) {
                   1268:                                m = so->so_rcv.sb_mb;
                   1269:                                goto dontblock;
                   1270:                        }
                   1271:                if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 &&
                   1272:                    (so->so_proto->pr_flags & PR_CONNREQUIRED)) {
                   1273:                        error = ENOTCONN;
                   1274:                        goto release;
                   1275:                }
                   1276:                if (uio->uio_resid == 0)
                   1277:                        goto release;
1.206     christos 1278:                if ((so->so_state & SS_NBIO) ||
                   1279:                    (flags & (MSG_DONTWAIT|MSG_NBIO))) {
1.1       cgd      1280:                        error = EWOULDBLOCK;
                   1281:                        goto release;
                   1282:                }
1.69      thorpej  1283:                SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1");
                   1284:                SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1");
1.1       cgd      1285:                sbunlock(&so->so_rcv);
1.196     dsl      1286:                if (wakeup_state & SS_RESTARTSYS)
                   1287:                        error = ERESTART;
                   1288:                else
                   1289:                        error = sbwait(&so->so_rcv);
1.160     ad       1290:                if (error != 0) {
                   1291:                        sounlock(so);
                   1292:                        splx(s);
1.144     dyoung   1293:                        return error;
1.160     ad       1294:                }
1.196     dsl      1295:                wakeup_state = so->so_state;
1.1       cgd      1296:                goto restart;
                   1297:        }
1.54      lukem    1298:  dontblock:
1.69      thorpej  1299:        /*
                   1300:         * On entry here, m points to the first record of the socket buffer.
1.159     ad       1301:         * From this point onward, we maintain 'nextrecord' as a cache of the
                   1302:         * pointer to the next record in the socket buffer.  We must keep the
                   1303:         * various socket buffer pointers and local stack versions of the
                   1304:         * pointers in sync, pushing out modifications before dropping the
1.160     ad       1305:         * socket lock, and re-reading them when picking it up.
1.159     ad       1306:         *
                   1307:         * Otherwise, we will race with the network stack appending new data
                   1308:         * or records onto the socket buffer by using inconsistent/stale
                   1309:         * versions of the field, possibly resulting in socket buffer
                   1310:         * corruption.
                   1311:         *
                   1312:         * By holding the high-level sblock(), we prevent simultaneous
                   1313:         * readers from pulling off the front of the socket buffer.
1.69      thorpej  1314:         */
1.144     dyoung   1315:        if (l != NULL)
1.157     ad       1316:                l->l_ru.ru_msgrcv++;
1.69      thorpej  1317:        KASSERT(m == so->so_rcv.sb_mb);
                   1318:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 1");
                   1319:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 1");
1.1       cgd      1320:        nextrecord = m->m_nextpkt;
                   1321:        if (pr->pr_flags & PR_ADDR) {
                   1322: #ifdef DIAGNOSTIC
                   1323:                if (m->m_type != MT_SONAME)
                   1324:                        panic("receive 1a");
                   1325: #endif
1.3       andrew   1326:                orig_resid = 0;
1.1       cgd      1327:                if (flags & MSG_PEEK) {
                   1328:                        if (paddr)
                   1329:                                *paddr = m_copy(m, 0, m->m_len);
                   1330:                        m = m->m_next;
                   1331:                } else {
                   1332:                        sbfree(&so->so_rcv, m);
1.67      he       1333:                        mbuf_removed = 1;
1.144     dyoung   1334:                        if (paddr != NULL) {
1.1       cgd      1335:                                *paddr = m;
                   1336:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1337:                                m->m_next = NULL;
1.1       cgd      1338:                                m = so->so_rcv.sb_mb;
                   1339:                        } else {
                   1340:                                MFREE(m, so->so_rcv.sb_mb);
                   1341:                                m = so->so_rcv.sb_mb;
                   1342:                        }
1.159     ad       1343:                        sbsync(&so->so_rcv, nextrecord);
1.1       cgd      1344:                }
                   1345:        }
1.159     ad       1346:
                   1347:        /*
                   1348:         * Process one or more MT_CONTROL mbufs present before any data mbufs
                   1349:         * in the first mbuf chain on the socket buffer.  If MSG_PEEK, we
                   1350:         * just copy the data; if !MSG_PEEK, we call into the protocol to
                   1351:         * perform externalization (or freeing if controlp == NULL).
                   1352:         */
                   1353:        if (__predict_false(m != NULL && m->m_type == MT_CONTROL)) {
                   1354:                struct mbuf *cm = NULL, *cmn;
                   1355:                struct mbuf **cme = &cm;
                   1356:
                   1357:                do {
                   1358:                        if (flags & MSG_PEEK) {
                   1359:                                if (controlp != NULL) {
                   1360:                                        *controlp = m_copy(m, 0, m->m_len);
                   1361:                                        controlp = &(*controlp)->m_next;
                   1362:                                }
                   1363:                                m = m->m_next;
                   1364:                        } else {
                   1365:                                sbfree(&so->so_rcv, m);
1.1       cgd      1366:                                so->so_rcv.sb_mb = m->m_next;
1.144     dyoung   1367:                                m->m_next = NULL;
1.159     ad       1368:                                *cme = m;
                   1369:                                cme = &(*cme)->m_next;
1.1       cgd      1370:                                m = so->so_rcv.sb_mb;
1.159     ad       1371:                        }
                   1372:                } while (m != NULL && m->m_type == MT_CONTROL);
                   1373:                if ((flags & MSG_PEEK) == 0)
                   1374:                        sbsync(&so->so_rcv, nextrecord);
                   1375:                for (; cm != NULL; cm = cmn) {
                   1376:                        cmn = cm->m_next;
                   1377:                        cm->m_next = NULL;
                   1378:                        type = mtod(cm, struct cmsghdr *)->cmsg_type;
                   1379:                        if (controlp != NULL) {
                   1380:                                if (dom->dom_externalize != NULL &&
                   1381:                                    type == SCM_RIGHTS) {
1.160     ad       1382:                                        sounlock(so);
1.159     ad       1383:                                        splx(s);
1.204     christos 1384:                                        error = (*dom->dom_externalize)(cm, l,
                   1385:                                            (flags & MSG_CMSG_CLOEXEC) ?
                   1386:                                            O_CLOEXEC : 0);
1.159     ad       1387:                                        s = splsoftnet();
1.160     ad       1388:                                        solock(so);
1.159     ad       1389:                                }
                   1390:                                *controlp = cm;
                   1391:                                while (*controlp != NULL)
                   1392:                                        controlp = &(*controlp)->m_next;
1.1       cgd      1393:                        } else {
1.106     itojun   1394:                                /*
                   1395:                                 * Dispose of any SCM_RIGHTS message that went
                   1396:                                 * through the read path rather than recv.
                   1397:                                 */
1.159     ad       1398:                                if (dom->dom_dispose != NULL &&
                   1399:                                    type == SCM_RIGHTS) {
1.160     ad       1400:                                        sounlock(so);
1.159     ad       1401:                                        (*dom->dom_dispose)(cm);
1.160     ad       1402:                                        solock(so);
1.159     ad       1403:                                }
                   1404:                                m_freem(cm);
1.1       cgd      1405:                        }
                   1406:                }
1.159     ad       1407:                if (m != NULL)
                   1408:                        nextrecord = so->so_rcv.sb_mb->m_nextpkt;
                   1409:                else
                   1410:                        nextrecord = so->so_rcv.sb_mb;
                   1411:                orig_resid = 0;
1.1       cgd      1412:        }
1.69      thorpej  1413:
1.159     ad       1414:        /* If m is non-NULL, we have some data to read. */
                   1415:        if (__predict_true(m != NULL)) {
1.1       cgd      1416:                type = m->m_type;
                   1417:                if (type == MT_OOBDATA)
                   1418:                        flags |= MSG_OOB;
                   1419:        }
1.69      thorpej  1420:        SBLASTRECORDCHK(&so->so_rcv, "soreceive 2");
                   1421:        SBLASTMBUFCHK(&so->so_rcv, "soreceive 2");
                   1422:
1.1       cgd      1423:        moff = 0;
                   1424:        offset = 0;
1.144     dyoung   1425:        while (m != NULL && uio->uio_resid > 0 && error == 0) {
1.1       cgd      1426:                if (m->m_type == MT_OOBDATA) {
                   1427:                        if (type != MT_OOBDATA)
                   1428:                                break;
                   1429:                } else if (type == MT_OOBDATA)
                   1430:                        break;
                   1431: #ifdef DIAGNOSTIC
                   1432:                else if (m->m_type != MT_DATA && m->m_type != MT_HEADER)
                   1433:                        panic("receive 3");
                   1434: #endif
                   1435:                so->so_state &= ~SS_RCVATMARK;
1.196     dsl      1436:                wakeup_state = 0;
1.1       cgd      1437:                len = uio->uio_resid;
                   1438:                if (so->so_oobmark && len > so->so_oobmark - offset)
                   1439:                        len = so->so_oobmark - offset;
                   1440:                if (len > m->m_len - moff)
                   1441:                        len = m->m_len - moff;
                   1442:                /*
                   1443:                 * If mp is set, just pass back the mbufs.
                   1444:                 * Otherwise copy them out via the uio, then free.
                   1445:                 * Sockbuf must be consistent here (points to current mbuf,
                   1446:                 * it points to next record) when we drop priority;
                   1447:                 * we must note any additions to the sockbuf when we
                   1448:                 * block interrupts again.
                   1449:                 */
1.144     dyoung   1450:                if (mp == NULL) {
1.69      thorpej  1451:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove");
                   1452:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove");
1.160     ad       1453:                        sounlock(so);
1.1       cgd      1454:                        splx(s);
1.211     chs      1455:                        error = uiomove(mtod(m, char *) + moff, len, uio);
1.20      mycroft  1456:                        s = splsoftnet();
1.160     ad       1457:                        solock(so);
1.144     dyoung   1458:                        if (error != 0) {
1.67      he       1459:                                /*
                   1460:                                 * If any part of the record has been removed
                   1461:                                 * (such as the MT_SONAME mbuf, which will
                   1462:                                 * happen when PR_ADDR, and thus also
                   1463:                                 * PR_ATOMIC, is set), then drop the entire
                   1464:                                 * record to maintain the atomicity of the
                   1465:                                 * receive operation.
                   1466:                                 *
                   1467:                                 * This avoids a later panic("receive 1a")
                   1468:                                 * when compiled with DIAGNOSTIC.
                   1469:                                 */
1.146     dyoung   1470:                                if (m && mbuf_removed && atomic)
1.67      he       1471:                                        (void) sbdroprecord(&so->so_rcv);
                   1472:
1.57      jdolecek 1473:                                goto release;
1.67      he       1474:                        }
1.1       cgd      1475:                } else
                   1476:                        uio->uio_resid -= len;
                   1477:                if (len == m->m_len - moff) {
                   1478:                        if (m->m_flags & M_EOR)
                   1479:                                flags |= MSG_EOR;
                   1480:                        if (flags & MSG_PEEK) {
                   1481:                                m = m->m_next;
                   1482:                                moff = 0;
                   1483:                        } else {
                   1484:                                nextrecord = m->m_nextpkt;
                   1485:                                sbfree(&so->so_rcv, m);
                   1486:                                if (mp) {
                   1487:                                        *mp = m;
                   1488:                                        mp = &m->m_next;
                   1489:                                        so->so_rcv.sb_mb = m = m->m_next;
1.140     dyoung   1490:                                        *mp = NULL;
1.1       cgd      1491:                                } else {
                   1492:                                        MFREE(m, so->so_rcv.sb_mb);
                   1493:                                        m = so->so_rcv.sb_mb;
                   1494:                                }
1.69      thorpej  1495:                                /*
                   1496:                                 * If m != NULL, we also know that
                   1497:                                 * so->so_rcv.sb_mb != NULL.
                   1498:                                 */
                   1499:                                KASSERT(so->so_rcv.sb_mb == m);
                   1500:                                if (m) {
1.1       cgd      1501:                                        m->m_nextpkt = nextrecord;
1.69      thorpej  1502:                                        if (nextrecord == NULL)
                   1503:                                                so->so_rcv.sb_lastrecord = m;
                   1504:                                } else {
                   1505:                                        so->so_rcv.sb_mb = nextrecord;
1.70      thorpej  1506:                                        SB_EMPTY_FIXUP(&so->so_rcv);
1.69      thorpej  1507:                                }
                   1508:                                SBLASTRECORDCHK(&so->so_rcv, "soreceive 3");
                   1509:                                SBLASTMBUFCHK(&so->so_rcv, "soreceive 3");
1.1       cgd      1510:                        }
1.144     dyoung   1511:                } else if (flags & MSG_PEEK)
                   1512:                        moff += len;
                   1513:                else {
1.160     ad       1514:                        if (mp != NULL) {
                   1515:                                mt = m_copym(m, 0, len, M_NOWAIT);
                   1516:                                if (__predict_false(mt == NULL)) {
                   1517:                                        sounlock(so);
                   1518:                                        mt = m_copym(m, 0, len, M_WAIT);
                   1519:                                        solock(so);
                   1520:                                }
                   1521:                                *mp = mt;
                   1522:                        }
1.144     dyoung   1523:                        m->m_data += len;
                   1524:                        m->m_len -= len;
                   1525:                        so->so_rcv.sb_cc -= len;
1.1       cgd      1526:                }
                   1527:                if (so->so_oobmark) {
                   1528:                        if ((flags & MSG_PEEK) == 0) {
                   1529:                                so->so_oobmark -= len;
                   1530:                                if (so->so_oobmark == 0) {
                   1531:                                        so->so_state |= SS_RCVATMARK;
                   1532:                                        break;
                   1533:                                }
1.7       cgd      1534:                        } else {
1.1       cgd      1535:                                offset += len;
1.7       cgd      1536:                                if (offset == so->so_oobmark)
                   1537:                                        break;
                   1538:                        }
1.1       cgd      1539:                }
                   1540:                if (flags & MSG_EOR)
                   1541:                        break;
                   1542:                /*
                   1543:                 * If the MSG_WAITALL flag is set (for non-atomic socket),
                   1544:                 * we must not quit until "uio->uio_resid == 0" or an error
                   1545:                 * termination.  If a signal/timeout occurs, return
                   1546:                 * with a short count but without error.
                   1547:                 * Keep sockbuf locked against other readers.
                   1548:                 */
1.144     dyoung   1549:                while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 &&
1.3       andrew   1550:                    !sosendallatonce(so) && !nextrecord) {
1.1       cgd      1551:                        if (so->so_error || so->so_state & SS_CANTRCVMORE)
                   1552:                                break;
1.68      matt     1553:                        /*
                   1554:                         * If we are peeking and the socket receive buffer is
                   1555:                         * full, stop since we can't get more data to peek at.
                   1556:                         */
                   1557:                        if ((flags & MSG_PEEK) && sbspace(&so->so_rcv) <= 0)
                   1558:                                break;
                   1559:                        /*
                   1560:                         * If we've drained the socket buffer, tell the
                   1561:                         * protocol in case it needs to do something to
                   1562:                         * get it filled again.
                   1563:                         */
                   1564:                        if ((pr->pr_flags & PR_WANTRCVD) && so->so_pcb)
1.215.4.1  rmind    1565:                                (*pr->pr_usrreqs->pr_generic)(so, PRU_RCVD,
1.140     dyoung   1566:                                    NULL, (struct mbuf *)(long)flags, NULL, l);
1.69      thorpej  1567:                        SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2");
                   1568:                        SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2");
1.196     dsl      1569:                        if (wakeup_state & SS_RESTARTSYS)
                   1570:                                error = ERESTART;
                   1571:                        else
                   1572:                                error = sbwait(&so->so_rcv);
1.144     dyoung   1573:                        if (error != 0) {
1.1       cgd      1574:                                sbunlock(&so->so_rcv);
1.160     ad       1575:                                sounlock(so);
1.1       cgd      1576:                                splx(s);
1.144     dyoung   1577:                                return 0;
1.1       cgd      1578:                        }
1.21      christos 1579:                        if ((m = so->so_rcv.sb_mb) != NULL)
1.1       cgd      1580:                                nextrecord = m->m_nextpkt;
1.196     dsl      1581:                        wakeup_state = so->so_state;
1.1       cgd      1582:                }
                   1583:        }
1.3       andrew   1584:
1.146     dyoung   1585:        if (m && atomic) {
1.3       andrew   1586:                flags |= MSG_TRUNC;
                   1587:                if ((flags & MSG_PEEK) == 0)
                   1588:                        (void) sbdroprecord(&so->so_rcv);
                   1589:        }
1.1       cgd      1590:        if ((flags & MSG_PEEK) == 0) {
1.144     dyoung   1591:                if (m == NULL) {
1.69      thorpej  1592:                        /*
1.70      thorpej  1593:                         * First part is an inline SB_EMPTY_FIXUP().  Second
1.69      thorpej  1594:                         * part makes sure sb_lastrecord is up-to-date if
                   1595:                         * there is still data in the socket buffer.
                   1596:                         */
1.1       cgd      1597:                        so->so_rcv.sb_mb = nextrecord;
1.69      thorpej  1598:                        if (so->so_rcv.sb_mb == NULL) {
                   1599:                                so->so_rcv.sb_mbtail = NULL;
                   1600:                                so->so_rcv.sb_lastrecord = NULL;
                   1601:                        } else if (nextrecord->m_nextpkt == NULL)
                   1602:                                so->so_rcv.sb_lastrecord = nextrecord;
                   1603:                }
                   1604:                SBLASTRECORDCHK(&so->so_rcv, "soreceive 4");
                   1605:                SBLASTMBUFCHK(&so->so_rcv, "soreceive 4");
1.1       cgd      1606:                if (pr->pr_flags & PR_WANTRCVD && so->so_pcb)
1.215.4.1  rmind    1607:                        (*pr->pr_usrreqs->pr_generic)(so, PRU_RCVD, NULL,
1.140     dyoung   1608:                            (struct mbuf *)(long)flags, NULL, l);
1.1       cgd      1609:        }
1.3       andrew   1610:        if (orig_resid == uio->uio_resid && orig_resid &&
                   1611:            (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) {
                   1612:                sbunlock(&so->so_rcv);
                   1613:                goto restart;
                   1614:        }
1.108     perry    1615:
1.144     dyoung   1616:        if (flagsp != NULL)
1.1       cgd      1617:                *flagsp |= flags;
1.54      lukem    1618:  release:
1.1       cgd      1619:        sbunlock(&so->so_rcv);
1.160     ad       1620:        sounlock(so);
1.1       cgd      1621:        splx(s);
1.144     dyoung   1622:        return error;
1.1       cgd      1623: }
                   1624:
1.14      mycroft  1625: int
1.54      lukem    1626: soshutdown(struct socket *so, int how)
1.1       cgd      1627: {
1.99      matt     1628:        const struct protosw    *pr;
1.160     ad       1629:        int     error;
                   1630:
                   1631:        KASSERT(solocked(so));
1.34      kleink   1632:
1.54      lukem    1633:        pr = so->so_proto;
1.34      kleink   1634:        if (!(how == SHUT_RD || how == SHUT_WR || how == SHUT_RDWR))
                   1635:                return (EINVAL);
1.1       cgd      1636:
1.160     ad       1637:        if (how == SHUT_RD || how == SHUT_RDWR) {
1.1       cgd      1638:                sorflush(so);
1.160     ad       1639:                error = 0;
                   1640:        }
1.34      kleink   1641:        if (how == SHUT_WR || how == SHUT_RDWR)
1.215.4.1  rmind    1642:                error = (*pr->pr_usrreqs->pr_generic)(so, PRU_SHUTDOWN, NULL,
1.140     dyoung   1643:                    NULL, NULL, NULL);
1.160     ad       1644:
                   1645:        return error;
1.1       cgd      1646: }
                   1647:
1.195     dsl      1648: void
1.196     dsl      1649: sorestart(struct socket *so)
1.188     ad       1650: {
1.196     dsl      1651:        /*
                   1652:         * An application has called close() on an fd on which another
                   1653:         * of its threads has called a socket system call.
                   1654:         * Mark this and wake everyone up, and code that would block again
                   1655:         * instead returns ERESTART.
                   1656:         * On system call re-entry the fd is validated and EBADF returned.
                   1657:         * Any other fd will block again on the 2nd syscall.
                   1658:         */
1.188     ad       1659:        solock(so);
1.196     dsl      1660:        so->so_state |= SS_RESTARTSYS;
1.188     ad       1661:        cv_broadcast(&so->so_cv);
1.196     dsl      1662:        cv_broadcast(&so->so_snd.sb_cv);
                   1663:        cv_broadcast(&so->so_rcv.sb_cv);
1.188     ad       1664:        sounlock(so);
                   1665: }
                   1666:
1.14      mycroft  1667: void
1.54      lukem    1668: sorflush(struct socket *so)
1.1       cgd      1669: {
1.54      lukem    1670:        struct sockbuf  *sb, asb;
1.99      matt     1671:        const struct protosw    *pr;
1.160     ad       1672:
                   1673:        KASSERT(solocked(so));
1.1       cgd      1674:
1.54      lukem    1675:        sb = &so->so_rcv;
                   1676:        pr = so->so_proto;
1.160     ad       1677:        socantrcvmore(so);
1.1       cgd      1678:        sb->sb_flags |= SB_NOINTR;
1.160     ad       1679:        (void )sblock(sb, M_WAITOK);
1.1       cgd      1680:        sbunlock(sb);
                   1681:        asb = *sb;
1.86      wrstuden 1682:        /*
                   1683:         * Clear most of the sockbuf structure, but leave some of the
                   1684:         * fields valid.
                   1685:         */
                   1686:        memset(&sb->sb_startzero, 0,
                   1687:            sizeof(*sb) - offsetof(struct sockbuf, sb_startzero));
1.160     ad       1688:        if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) {
                   1689:                sounlock(so);
1.1       cgd      1690:                (*pr->pr_domain->dom_dispose)(asb.sb_mb);
1.160     ad       1691:                solock(so);
                   1692:        }
1.98      christos 1693:        sbrelease(&asb, so);
1.1       cgd      1694: }
                   1695:
1.171     plunky   1696: /*
                   1697:  * internal set SOL_SOCKET options
                   1698:  */
1.142     dyoung   1699: static int
1.171     plunky   1700: sosetopt1(struct socket *so, const struct sockopt *sopt)
1.1       cgd      1701: {
1.182     christos 1702:        int error = EINVAL, optval, opt;
1.171     plunky   1703:        struct linger l;
                   1704:        struct timeval tv;
1.142     dyoung   1705:
1.179     christos 1706:        switch ((opt = sopt->sopt_name)) {
1.142     dyoung   1707:
1.170     tls      1708:        case SO_ACCEPTFILTER:
1.177     ad       1709:                error = accept_filt_setopt(so, sopt);
                   1710:                KASSERT(solocked(so));
1.170     tls      1711:                break;
                   1712:
1.171     plunky   1713:        case SO_LINGER:
                   1714:                error = sockopt_get(sopt, &l, sizeof(l));
1.177     ad       1715:                solock(so);
1.171     plunky   1716:                if (error)
1.177     ad       1717:                        break;
1.171     plunky   1718:                if (l.l_linger < 0 || l.l_linger > USHRT_MAX ||
1.177     ad       1719:                    l.l_linger > (INT_MAX / hz)) {
                   1720:                        error = EDOM;
                   1721:                        break;
                   1722:                }
1.171     plunky   1723:                so->so_linger = l.l_linger;
                   1724:                if (l.l_onoff)
                   1725:                        so->so_options |= SO_LINGER;
                   1726:                else
                   1727:                        so->so_options &= ~SO_LINGER;
1.177     ad       1728:                break;
1.1       cgd      1729:
1.142     dyoung   1730:        case SO_DEBUG:
                   1731:        case SO_KEEPALIVE:
                   1732:        case SO_DONTROUTE:
                   1733:        case SO_USELOOPBACK:
                   1734:        case SO_BROADCAST:
                   1735:        case SO_REUSEADDR:
                   1736:        case SO_REUSEPORT:
                   1737:        case SO_OOBINLINE:
                   1738:        case SO_TIMESTAMP:
1.207     christos 1739:        case SO_NOSIGPIPE:
1.184     christos 1740: #ifdef SO_OTIMESTAMP
                   1741:        case SO_OTIMESTAMP:
                   1742: #endif
1.171     plunky   1743:                error = sockopt_getint(sopt, &optval);
1.177     ad       1744:                solock(so);
1.171     plunky   1745:                if (error)
1.177     ad       1746:                        break;
1.171     plunky   1747:                if (optval)
1.179     christos 1748:                        so->so_options |= opt;
1.142     dyoung   1749:                else
1.179     christos 1750:                        so->so_options &= ~opt;
1.142     dyoung   1751:                break;
                   1752:
                   1753:        case SO_SNDBUF:
                   1754:        case SO_RCVBUF:
                   1755:        case SO_SNDLOWAT:
                   1756:        case SO_RCVLOWAT:
1.171     plunky   1757:                error = sockopt_getint(sopt, &optval);
1.177     ad       1758:                solock(so);
1.171     plunky   1759:                if (error)
1.177     ad       1760:                        break;
1.1       cgd      1761:
1.142     dyoung   1762:                /*
                   1763:                 * Values < 1 make no sense for any of these
                   1764:                 * options, so disallow them.
                   1765:                 */
1.177     ad       1766:                if (optval < 1) {
                   1767:                        error = EINVAL;
                   1768:                        break;
                   1769:                }
1.1       cgd      1770:
1.179     christos 1771:                switch (opt) {
1.171     plunky   1772:                case SO_SNDBUF:
1.177     ad       1773:                        if (sbreserve(&so->so_snd, (u_long)optval, so) == 0) {
                   1774:                                error = ENOBUFS;
                   1775:                                break;
                   1776:                        }
1.171     plunky   1777:                        so->so_snd.sb_flags &= ~SB_AUTOSIZE;
                   1778:                        break;
1.1       cgd      1779:
                   1780:                case SO_RCVBUF:
1.177     ad       1781:                        if (sbreserve(&so->so_rcv, (u_long)optval, so) == 0) {
                   1782:                                error = ENOBUFS;
                   1783:                                break;
                   1784:                        }
1.171     plunky   1785:                        so->so_rcv.sb_flags &= ~SB_AUTOSIZE;
1.142     dyoung   1786:                        break;
                   1787:
                   1788:                /*
                   1789:                 * Make sure the low-water is never greater than
                   1790:                 * the high-water.
                   1791:                 */
1.1       cgd      1792:                case SO_SNDLOWAT:
1.171     plunky   1793:                        if (optval > so->so_snd.sb_hiwat)
                   1794:                                optval = so->so_snd.sb_hiwat;
                   1795:
                   1796:                        so->so_snd.sb_lowat = optval;
1.142     dyoung   1797:                        break;
1.171     plunky   1798:
1.1       cgd      1799:                case SO_RCVLOWAT:
1.171     plunky   1800:                        if (optval > so->so_rcv.sb_hiwat)
                   1801:                                optval = so->so_rcv.sb_hiwat;
                   1802:
                   1803:                        so->so_rcv.sb_lowat = optval;
1.142     dyoung   1804:                        break;
                   1805:                }
                   1806:                break;
1.28      thorpej  1807:
1.179     christos 1808: #ifdef COMPAT_50
                   1809:        case SO_OSNDTIMEO:
                   1810:        case SO_ORCVTIMEO: {
                   1811:                struct timeval50 otv;
                   1812:                error = sockopt_get(sopt, &otv, sizeof(otv));
1.186     pooka    1813:                if (error) {
                   1814:                        solock(so);
1.183     christos 1815:                        break;
1.186     pooka    1816:                }
1.179     christos 1817:                timeval50_to_timeval(&otv, &tv);
                   1818:                opt = opt == SO_OSNDTIMEO ? SO_SNDTIMEO : SO_RCVTIMEO;
1.182     christos 1819:                error = 0;
1.179     christos 1820:                /*FALLTHROUGH*/
                   1821:        }
                   1822: #endif /* COMPAT_50 */
                   1823:
1.142     dyoung   1824:        case SO_SNDTIMEO:
                   1825:        case SO_RCVTIMEO:
1.182     christos 1826:                if (error)
1.179     christos 1827:                        error = sockopt_get(sopt, &tv, sizeof(tv));
1.177     ad       1828:                solock(so);
1.171     plunky   1829:                if (error)
1.177     ad       1830:                        break;
1.171     plunky   1831:
1.177     ad       1832:                if (tv.tv_sec > (INT_MAX - tv.tv_usec / tick) / hz) {
                   1833:                        error = EDOM;
                   1834:                        break;
                   1835:                }
1.28      thorpej  1836:
1.171     plunky   1837:                optval = tv.tv_sec * hz + tv.tv_usec / tick;
                   1838:                if (optval == 0 && tv.tv_usec != 0)
                   1839:                        optval = 1;
1.28      thorpej  1840:
1.179     christos 1841:                switch (opt) {
1.142     dyoung   1842:                case SO_SNDTIMEO:
1.171     plunky   1843:                        so->so_snd.sb_timeo = optval;
1.1       cgd      1844:                        break;
                   1845:                case SO_RCVTIMEO:
1.171     plunky   1846:                        so->so_rcv.sb_timeo = optval;
1.142     dyoung   1847:                        break;
                   1848:                }
                   1849:                break;
1.1       cgd      1850:
1.142     dyoung   1851:        default:
1.177     ad       1852:                solock(so);
                   1853:                error = ENOPROTOOPT;
                   1854:                break;
1.142     dyoung   1855:        }
1.177     ad       1856:        KASSERT(solocked(so));
                   1857:        return error;
1.142     dyoung   1858: }
1.1       cgd      1859:
1.142     dyoung   1860: int
1.171     plunky   1861: sosetopt(struct socket *so, struct sockopt *sopt)
1.142     dyoung   1862: {
                   1863:        int error, prerr;
1.1       cgd      1864:
1.177     ad       1865:        if (sopt->sopt_level == SOL_SOCKET) {
1.171     plunky   1866:                error = sosetopt1(so, sopt);
1.177     ad       1867:                KASSERT(solocked(so));
                   1868:        } else {
1.142     dyoung   1869:                error = ENOPROTOOPT;
1.177     ad       1870:                solock(so);
                   1871:        }
1.1       cgd      1872:
1.142     dyoung   1873:        if ((error == 0 || error == ENOPROTOOPT) &&
                   1874:            so->so_proto != NULL && so->so_proto->pr_ctloutput != NULL) {
                   1875:                /* give the protocol stack a shot */
1.171     plunky   1876:                prerr = (*so->so_proto->pr_ctloutput)(PRCO_SETOPT, so, sopt);
1.142     dyoung   1877:                if (prerr == 0)
                   1878:                        error = 0;
                   1879:                else if (prerr != ENOPROTOOPT)
                   1880:                        error = prerr;
1.171     plunky   1881:        }
1.160     ad       1882:        sounlock(so);
1.142     dyoung   1883:        return error;
1.1       cgd      1884: }
                   1885:
1.171     plunky   1886: /*
                   1887:  * so_setsockopt() is a wrapper providing a sockopt structure for sosetopt()
                   1888:  */
                   1889: int
                   1890: so_setsockopt(struct lwp *l, struct socket *so, int level, int name,
                   1891:     const void *val, size_t valsize)
                   1892: {
                   1893:        struct sockopt sopt;
                   1894:        int error;
                   1895:
                   1896:        KASSERT(valsize == 0 || val != NULL);
                   1897:
                   1898:        sockopt_init(&sopt, level, name, valsize);
                   1899:        sockopt_set(&sopt, val, valsize);
                   1900:
                   1901:        error = sosetopt(so, &sopt);
                   1902:
                   1903:        sockopt_destroy(&sopt);
                   1904:
                   1905:        return error;
                   1906: }
                   1907:
                   1908: /*
                   1909:  * internal get SOL_SOCKET options
                   1910:  */
                   1911: static int
                   1912: sogetopt1(struct socket *so, struct sockopt *sopt)
                   1913: {
1.179     christos 1914:        int error, optval, opt;
1.171     plunky   1915:        struct linger l;
                   1916:        struct timeval tv;
                   1917:
1.179     christos 1918:        switch ((opt = sopt->sopt_name)) {
1.171     plunky   1919:
                   1920:        case SO_ACCEPTFILTER:
1.177     ad       1921:                error = accept_filt_getopt(so, sopt);
1.171     plunky   1922:                break;
                   1923:
                   1924:        case SO_LINGER:
                   1925:                l.l_onoff = (so->so_options & SO_LINGER) ? 1 : 0;
                   1926:                l.l_linger = so->so_linger;
                   1927:
                   1928:                error = sockopt_set(sopt, &l, sizeof(l));
                   1929:                break;
                   1930:
                   1931:        case SO_USELOOPBACK:
                   1932:        case SO_DONTROUTE:
                   1933:        case SO_DEBUG:
                   1934:        case SO_KEEPALIVE:
                   1935:        case SO_REUSEADDR:
                   1936:        case SO_REUSEPORT:
                   1937:        case SO_BROADCAST:
                   1938:        case SO_OOBINLINE:
                   1939:        case SO_TIMESTAMP:
1.207     christos 1940:        case SO_NOSIGPIPE:
1.184     christos 1941: #ifdef SO_OTIMESTAMP
                   1942:        case SO_OTIMESTAMP:
                   1943: #endif
1.179     christos 1944:                error = sockopt_setint(sopt, (so->so_options & opt) ? 1 : 0);
1.171     plunky   1945:                break;
                   1946:
                   1947:        case SO_TYPE:
                   1948:                error = sockopt_setint(sopt, so->so_type);
                   1949:                break;
                   1950:
                   1951:        case SO_ERROR:
                   1952:                error = sockopt_setint(sopt, so->so_error);
                   1953:                so->so_error = 0;
                   1954:                break;
                   1955:
                   1956:        case SO_SNDBUF:
                   1957:                error = sockopt_setint(sopt, so->so_snd.sb_hiwat);
                   1958:                break;
                   1959:
                   1960:        case SO_RCVBUF:
                   1961:                error = sockopt_setint(sopt, so->so_rcv.sb_hiwat);
                   1962:                break;
                   1963:
                   1964:        case SO_SNDLOWAT:
                   1965:                error = sockopt_setint(sopt, so->so_snd.sb_lowat);
                   1966:                break;
                   1967:
                   1968:        case SO_RCVLOWAT:
                   1969:                error = sockopt_setint(sopt, so->so_rcv.sb_lowat);
                   1970:                break;
                   1971:
1.179     christos 1972: #ifdef COMPAT_50
                   1973:        case SO_OSNDTIMEO:
                   1974:        case SO_ORCVTIMEO: {
                   1975:                struct timeval50 otv;
                   1976:
                   1977:                optval = (opt == SO_OSNDTIMEO ?
                   1978:                     so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
                   1979:
                   1980:                otv.tv_sec = optval / hz;
                   1981:                otv.tv_usec = (optval % hz) * tick;
                   1982:
                   1983:                error = sockopt_set(sopt, &otv, sizeof(otv));
                   1984:                break;
                   1985:        }
                   1986: #endif /* COMPAT_50 */
                   1987:
1.171     plunky   1988:        case SO_SNDTIMEO:
                   1989:        case SO_RCVTIMEO:
1.179     christos 1990:                optval = (opt == SO_SNDTIMEO ?
1.171     plunky   1991:                     so->so_snd.sb_timeo : so->so_rcv.sb_timeo);
                   1992:
                   1993:                tv.tv_sec = optval / hz;
                   1994:                tv.tv_usec = (optval % hz) * tick;
                   1995:
                   1996:                error = sockopt_set(sopt, &tv, sizeof(tv));
                   1997:                break;
                   1998:
                   1999:        case SO_OVERFLOWED:
                   2000:                error = sockopt_setint(sopt, so->so_rcv.sb_overflowed);
                   2001:                break;
                   2002:
                   2003:        default:
                   2004:                error = ENOPROTOOPT;
                   2005:                break;
                   2006:        }
                   2007:
                   2008:        return (error);
                   2009: }
                   2010:
1.14      mycroft  2011: int
1.171     plunky   2012: sogetopt(struct socket *so, struct sockopt *sopt)
1.1       cgd      2013: {
1.160     ad       2014:        int             error;
1.1       cgd      2015:
1.160     ad       2016:        solock(so);
1.171     plunky   2017:        if (sopt->sopt_level != SOL_SOCKET) {
1.1       cgd      2018:                if (so->so_proto && so->so_proto->pr_ctloutput) {
1.160     ad       2019:                        error = ((*so->so_proto->pr_ctloutput)
1.171     plunky   2020:                            (PRCO_GETOPT, so, sopt));
1.1       cgd      2021:                } else
1.160     ad       2022:                        error = (ENOPROTOOPT);
1.1       cgd      2023:        } else {
1.171     plunky   2024:                error = sogetopt1(so, sopt);
                   2025:        }
                   2026:        sounlock(so);
                   2027:        return (error);
                   2028: }
                   2029:
                   2030: /*
                   2031:  * alloc sockopt data buffer buffer
                   2032:  *     - will be released at destroy
                   2033:  */
1.176     plunky   2034: static int
                   2035: sockopt_alloc(struct sockopt *sopt, size_t len, km_flag_t kmflag)
1.171     plunky   2036: {
                   2037:
                   2038:        KASSERT(sopt->sopt_size == 0);
                   2039:
1.176     plunky   2040:        if (len > sizeof(sopt->sopt_buf)) {
                   2041:                sopt->sopt_data = kmem_zalloc(len, kmflag);
                   2042:                if (sopt->sopt_data == NULL)
                   2043:                        return ENOMEM;
                   2044:        } else
1.171     plunky   2045:                sopt->sopt_data = sopt->sopt_buf;
                   2046:
                   2047:        sopt->sopt_size = len;
1.176     plunky   2048:        return 0;
1.171     plunky   2049: }
                   2050:
                   2051: /*
                   2052:  * initialise sockopt storage
1.176     plunky   2053:  *     - MAY sleep during allocation
1.171     plunky   2054:  */
                   2055: void
                   2056: sockopt_init(struct sockopt *sopt, int level, int name, size_t size)
                   2057: {
1.1       cgd      2058:
1.171     plunky   2059:        memset(sopt, 0, sizeof(*sopt));
1.1       cgd      2060:
1.171     plunky   2061:        sopt->sopt_level = level;
                   2062:        sopt->sopt_name = name;
1.176     plunky   2063:        (void)sockopt_alloc(sopt, size, KM_SLEEP);
1.171     plunky   2064: }
                   2065:
                   2066: /*
                   2067:  * destroy sockopt storage
                   2068:  *     - will release any held memory references
                   2069:  */
                   2070: void
                   2071: sockopt_destroy(struct sockopt *sopt)
                   2072: {
                   2073:
                   2074:        if (sopt->sopt_data != sopt->sopt_buf)
1.173     plunky   2075:                kmem_free(sopt->sopt_data, sopt->sopt_size);
1.171     plunky   2076:
                   2077:        memset(sopt, 0, sizeof(*sopt));
                   2078: }
                   2079:
                   2080: /*
                   2081:  * set sockopt value
                   2082:  *     - value is copied into sockopt
1.176     plunky   2083:  *     - memory is allocated when necessary, will not sleep
1.171     plunky   2084:  */
                   2085: int
                   2086: sockopt_set(struct sockopt *sopt, const void *buf, size_t len)
                   2087: {
1.176     plunky   2088:        int error;
1.171     plunky   2089:
1.176     plunky   2090:        if (sopt->sopt_size == 0) {
                   2091:                error = sockopt_alloc(sopt, len, KM_NOSLEEP);
                   2092:                if (error)
                   2093:                        return error;
                   2094:        }
1.171     plunky   2095:
                   2096:        KASSERT(sopt->sopt_size == len);
                   2097:        memcpy(sopt->sopt_data, buf, len);
                   2098:        return 0;
                   2099: }
                   2100:
                   2101: /*
                   2102:  * common case of set sockopt integer value
                   2103:  */
                   2104: int
                   2105: sockopt_setint(struct sockopt *sopt, int val)
                   2106: {
                   2107:
                   2108:        return sockopt_set(sopt, &val, sizeof(int));
                   2109: }
                   2110:
                   2111: /*
                   2112:  * get sockopt value
                   2113:  *     - correct size must be given
                   2114:  */
                   2115: int
                   2116: sockopt_get(const struct sockopt *sopt, void *buf, size_t len)
                   2117: {
1.170     tls      2118:
1.171     plunky   2119:        if (sopt->sopt_size != len)
                   2120:                return EINVAL;
1.1       cgd      2121:
1.171     plunky   2122:        memcpy(buf, sopt->sopt_data, len);
                   2123:        return 0;
                   2124: }
1.1       cgd      2125:
1.171     plunky   2126: /*
                   2127:  * common case of get sockopt integer value
                   2128:  */
                   2129: int
                   2130: sockopt_getint(const struct sockopt *sopt, int *valp)
                   2131: {
1.1       cgd      2132:
1.171     plunky   2133:        return sockopt_get(sopt, valp, sizeof(int));
                   2134: }
1.1       cgd      2135:
1.171     plunky   2136: /*
                   2137:  * set sockopt value from mbuf
                   2138:  *     - ONLY for legacy code
                   2139:  *     - mbuf is released by sockopt
1.176     plunky   2140:  *     - will not sleep
1.171     plunky   2141:  */
                   2142: int
                   2143: sockopt_setmbuf(struct sockopt *sopt, struct mbuf *m)
                   2144: {
                   2145:        size_t len;
1.176     plunky   2146:        int error;
1.1       cgd      2147:
1.171     plunky   2148:        len = m_length(m);
1.1       cgd      2149:
1.176     plunky   2150:        if (sopt->sopt_size == 0) {
                   2151:                error = sockopt_alloc(sopt, len, KM_NOSLEEP);
                   2152:                if (error)
                   2153:                        return error;
                   2154:        }
1.1       cgd      2155:
1.171     plunky   2156:        KASSERT(sopt->sopt_size == len);
                   2157:        m_copydata(m, 0, len, sopt->sopt_data);
                   2158:        m_freem(m);
1.1       cgd      2159:
1.171     plunky   2160:        return 0;
                   2161: }
1.1       cgd      2162:
1.171     plunky   2163: /*
                   2164:  * get sockopt value into mbuf
                   2165:  *     - ONLY for legacy code
                   2166:  *     - mbuf to be released by the caller
1.176     plunky   2167:  *     - will not sleep
1.171     plunky   2168:  */
                   2169: struct mbuf *
                   2170: sockopt_getmbuf(const struct sockopt *sopt)
                   2171: {
                   2172:        struct mbuf *m;
1.107     darrenr  2173:
1.176     plunky   2174:        if (sopt->sopt_size > MCLBYTES)
                   2175:                return NULL;
                   2176:
                   2177:        m = m_get(M_DONTWAIT, MT_SOOPTS);
1.171     plunky   2178:        if (m == NULL)
                   2179:                return NULL;
                   2180:
1.176     plunky   2181:        if (sopt->sopt_size > MLEN) {
                   2182:                MCLGET(m, M_DONTWAIT);
                   2183:                if ((m->m_flags & M_EXT) == 0) {
                   2184:                        m_free(m);
                   2185:                        return NULL;
                   2186:                }
1.1       cgd      2187:        }
1.176     plunky   2188:
                   2189:        memcpy(mtod(m, void *), sopt->sopt_data, sopt->sopt_size);
                   2190:        m->m_len = sopt->sopt_size;
1.160     ad       2191:
1.171     plunky   2192:        return m;
1.1       cgd      2193: }
                   2194:
1.14      mycroft  2195: void
1.54      lukem    2196: sohasoutofband(struct socket *so)
1.1       cgd      2197: {
1.153     rmind    2198:
1.90      christos 2199:        fownsignal(so->so_pgid, SIGURG, POLL_PRI, POLLPRI|POLLRDBAND, so);
1.189     ad       2200:        selnotify(&so->so_rcv.sb_sel, POLLPRI | POLLRDBAND, NOTE_SUBMIT);
1.1       cgd      2201: }
1.72      jdolecek 2202:
                   2203: static void
                   2204: filt_sordetach(struct knote *kn)
                   2205: {
                   2206:        struct socket   *so;
                   2207:
1.155     ad       2208:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2209:        solock(so);
1.73      christos 2210:        SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext);
                   2211:        if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist))
1.72      jdolecek 2212:                so->so_rcv.sb_flags &= ~SB_KNOTE;
1.160     ad       2213:        sounlock(so);
1.72      jdolecek 2214: }
                   2215:
                   2216: /*ARGSUSED*/
                   2217: static int
1.129     yamt     2218: filt_soread(struct knote *kn, long hint)
1.72      jdolecek 2219: {
                   2220:        struct socket   *so;
1.160     ad       2221:        int rv;
1.72      jdolecek 2222:
1.155     ad       2223:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2224:        if (hint != NOTE_SUBMIT)
                   2225:                solock(so);
1.72      jdolecek 2226:        kn->kn_data = so->so_rcv.sb_cc;
                   2227:        if (so->so_state & SS_CANTRCVMORE) {
1.108     perry    2228:                kn->kn_flags |= EV_EOF;
1.72      jdolecek 2229:                kn->kn_fflags = so->so_error;
1.160     ad       2230:                rv = 1;
                   2231:        } else if (so->so_error)        /* temporary udp error */
                   2232:                rv = 1;
                   2233:        else if (kn->kn_sfflags & NOTE_LOWAT)
                   2234:                rv = (kn->kn_data >= kn->kn_sdata);
                   2235:        else
                   2236:                rv = (kn->kn_data >= so->so_rcv.sb_lowat);
                   2237:        if (hint != NOTE_SUBMIT)
                   2238:                sounlock(so);
                   2239:        return rv;
1.72      jdolecek 2240: }
                   2241:
                   2242: static void
                   2243: filt_sowdetach(struct knote *kn)
                   2244: {
                   2245:        struct socket   *so;
                   2246:
1.155     ad       2247:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2248:        solock(so);
1.73      christos 2249:        SLIST_REMOVE(&so->so_snd.sb_sel.sel_klist, kn, knote, kn_selnext);
                   2250:        if (SLIST_EMPTY(&so->so_snd.sb_sel.sel_klist))
1.72      jdolecek 2251:                so->so_snd.sb_flags &= ~SB_KNOTE;
1.160     ad       2252:        sounlock(so);
1.72      jdolecek 2253: }
                   2254:
                   2255: /*ARGSUSED*/
                   2256: static int
1.129     yamt     2257: filt_sowrite(struct knote *kn, long hint)
1.72      jdolecek 2258: {
                   2259:        struct socket   *so;
1.160     ad       2260:        int rv;
1.72      jdolecek 2261:
1.155     ad       2262:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2263:        if (hint != NOTE_SUBMIT)
                   2264:                solock(so);
1.72      jdolecek 2265:        kn->kn_data = sbspace(&so->so_snd);
                   2266:        if (so->so_state & SS_CANTSENDMORE) {
1.108     perry    2267:                kn->kn_flags |= EV_EOF;
1.72      jdolecek 2268:                kn->kn_fflags = so->so_error;
1.160     ad       2269:                rv = 1;
                   2270:        } else if (so->so_error)        /* temporary udp error */
                   2271:                rv = 1;
                   2272:        else if (((so->so_state & SS_ISCONNECTED) == 0) &&
1.72      jdolecek 2273:            (so->so_proto->pr_flags & PR_CONNREQUIRED))
1.160     ad       2274:                rv = 0;
                   2275:        else if (kn->kn_sfflags & NOTE_LOWAT)
                   2276:                rv = (kn->kn_data >= kn->kn_sdata);
                   2277:        else
                   2278:                rv = (kn->kn_data >= so->so_snd.sb_lowat);
                   2279:        if (hint != NOTE_SUBMIT)
                   2280:                sounlock(so);
                   2281:        return rv;
1.72      jdolecek 2282: }
                   2283:
                   2284: /*ARGSUSED*/
                   2285: static int
1.129     yamt     2286: filt_solisten(struct knote *kn, long hint)
1.72      jdolecek 2287: {
                   2288:        struct socket   *so;
1.160     ad       2289:        int rv;
1.72      jdolecek 2290:
1.155     ad       2291:        so = ((file_t *)kn->kn_obj)->f_data;
1.72      jdolecek 2292:
                   2293:        /*
                   2294:         * Set kn_data to number of incoming connections, not
                   2295:         * counting partial (incomplete) connections.
1.108     perry    2296:         */
1.160     ad       2297:        if (hint != NOTE_SUBMIT)
                   2298:                solock(so);
1.72      jdolecek 2299:        kn->kn_data = so->so_qlen;
1.160     ad       2300:        rv = (kn->kn_data > 0);
                   2301:        if (hint != NOTE_SUBMIT)
                   2302:                sounlock(so);
                   2303:        return rv;
1.72      jdolecek 2304: }
                   2305:
                   2306: static const struct filterops solisten_filtops =
                   2307:        { 1, NULL, filt_sordetach, filt_solisten };
                   2308: static const struct filterops soread_filtops =
                   2309:        { 1, NULL, filt_sordetach, filt_soread };
                   2310: static const struct filterops sowrite_filtops =
                   2311:        { 1, NULL, filt_sowdetach, filt_sowrite };
                   2312:
                   2313: int
1.129     yamt     2314: soo_kqfilter(struct file *fp, struct knote *kn)
1.72      jdolecek 2315: {
                   2316:        struct socket   *so;
                   2317:        struct sockbuf  *sb;
                   2318:
1.155     ad       2319:        so = ((file_t *)kn->kn_obj)->f_data;
1.160     ad       2320:        solock(so);
1.72      jdolecek 2321:        switch (kn->kn_filter) {
                   2322:        case EVFILT_READ:
                   2323:                if (so->so_options & SO_ACCEPTCONN)
                   2324:                        kn->kn_fop = &solisten_filtops;
                   2325:                else
                   2326:                        kn->kn_fop = &soread_filtops;
                   2327:                sb = &so->so_rcv;
                   2328:                break;
                   2329:        case EVFILT_WRITE:
                   2330:                kn->kn_fop = &sowrite_filtops;
                   2331:                sb = &so->so_snd;
                   2332:                break;
                   2333:        default:
1.160     ad       2334:                sounlock(so);
1.149     pooka    2335:                return (EINVAL);
1.72      jdolecek 2336:        }
1.73      christos 2337:        SLIST_INSERT_HEAD(&sb->sb_sel.sel_klist, kn, kn_selnext);
1.72      jdolecek 2338:        sb->sb_flags |= SB_KNOTE;
1.160     ad       2339:        sounlock(so);
1.72      jdolecek 2340:        return (0);
                   2341: }
                   2342:
1.154     ad       2343: static int
                   2344: sodopoll(struct socket *so, int events)
                   2345: {
                   2346:        int revents;
                   2347:
                   2348:        revents = 0;
                   2349:
                   2350:        if (events & (POLLIN | POLLRDNORM))
                   2351:                if (soreadable(so))
                   2352:                        revents |= events & (POLLIN | POLLRDNORM);
                   2353:
                   2354:        if (events & (POLLOUT | POLLWRNORM))
                   2355:                if (sowritable(so))
                   2356:                        revents |= events & (POLLOUT | POLLWRNORM);
                   2357:
                   2358:        if (events & (POLLPRI | POLLRDBAND))
                   2359:                if (so->so_oobmark || (so->so_state & SS_RCVATMARK))
                   2360:                        revents |= events & (POLLPRI | POLLRDBAND);
                   2361:
                   2362:        return revents;
                   2363: }
                   2364:
                   2365: int
                   2366: sopoll(struct socket *so, int events)
                   2367: {
                   2368:        int revents = 0;
                   2369:
1.160     ad       2370: #ifndef DIAGNOSTIC
                   2371:        /*
                   2372:         * Do a quick, unlocked check in expectation that the socket
                   2373:         * will be ready for I/O.  Don't do this check if DIAGNOSTIC,
                   2374:         * as the solocked() assertions will fail.
                   2375:         */
1.154     ad       2376:        if ((revents = sodopoll(so, events)) != 0)
                   2377:                return revents;
1.160     ad       2378: #endif
1.154     ad       2379:
1.160     ad       2380:        solock(so);
1.154     ad       2381:        if ((revents = sodopoll(so, events)) == 0) {
                   2382:                if (events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
                   2383:                        selrecord(curlwp, &so->so_rcv.sb_sel);
1.160     ad       2384:                        so->so_rcv.sb_flags |= SB_NOTIFY;
1.154     ad       2385:                }
                   2386:
                   2387:                if (events & (POLLOUT | POLLWRNORM)) {
                   2388:                        selrecord(curlwp, &so->so_snd.sb_sel);
1.160     ad       2389:                        so->so_snd.sb_flags |= SB_NOTIFY;
1.154     ad       2390:                }
                   2391:        }
1.160     ad       2392:        sounlock(so);
1.154     ad       2393:
                   2394:        return revents;
                   2395: }
                   2396:
                   2397:
1.94      yamt     2398: #include <sys/sysctl.h>
                   2399:
                   2400: static int sysctl_kern_somaxkva(SYSCTLFN_PROTO);
1.212     pooka    2401: static int sysctl_kern_sbmax(SYSCTLFN_PROTO);
1.94      yamt     2402:
                   2403: /*
                   2404:  * sysctl helper routine for kern.somaxkva.  ensures that the given
                   2405:  * value is not too small.
                   2406:  * (XXX should we maybe make sure it's not too large as well?)
                   2407:  */
                   2408: static int
                   2409: sysctl_kern_somaxkva(SYSCTLFN_ARGS)
                   2410: {
                   2411:        int error, new_somaxkva;
                   2412:        struct sysctlnode node;
                   2413:
                   2414:        new_somaxkva = somaxkva;
                   2415:        node = *rnode;
                   2416:        node.sysctl_data = &new_somaxkva;
                   2417:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2418:        if (error || newp == NULL)
                   2419:                return (error);
                   2420:
                   2421:        if (new_somaxkva < (16 * 1024 * 1024)) /* sanity */
                   2422:                return (EINVAL);
                   2423:
1.136     ad       2424:        mutex_enter(&so_pendfree_lock);
1.94      yamt     2425:        somaxkva = new_somaxkva;
1.136     ad       2426:        cv_broadcast(&socurkva_cv);
                   2427:        mutex_exit(&so_pendfree_lock);
1.94      yamt     2428:
                   2429:        return (error);
                   2430: }
                   2431:
1.212     pooka    2432: /*
                   2433:  * sysctl helper routine for kern.sbmax. Basically just ensures that
                   2434:  * any new value is not too small.
                   2435:  */
                   2436: static int
                   2437: sysctl_kern_sbmax(SYSCTLFN_ARGS)
                   2438: {
                   2439:        int error, new_sbmax;
                   2440:        struct sysctlnode node;
                   2441:
                   2442:        new_sbmax = sb_max;
                   2443:        node = *rnode;
                   2444:        node.sysctl_data = &new_sbmax;
                   2445:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   2446:        if (error || newp == NULL)
                   2447:                return (error);
                   2448:
                   2449:        KERNEL_LOCK(1, NULL);
                   2450:        error = sb_max_set(new_sbmax);
                   2451:        KERNEL_UNLOCK_ONE(NULL);
                   2452:
                   2453:        return (error);
                   2454: }
                   2455:
1.178     pooka    2456: static void
1.212     pooka    2457: sysctl_kern_socket_setup(void)
1.94      yamt     2458: {
                   2459:
1.178     pooka    2460:        KASSERT(socket_sysctllog == NULL);
                   2461:        sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97      atatat   2462:                       CTLFLAG_PERMANENT,
                   2463:                       CTLTYPE_NODE, "kern", NULL,
                   2464:                       NULL, 0, NULL, 0,
                   2465:                       CTL_KERN, CTL_EOL);
                   2466:
1.178     pooka    2467:        sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
1.97      atatat   2468:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.103     atatat   2469:                       CTLTYPE_INT, "somaxkva",
                   2470:                       SYSCTL_DESCR("Maximum amount of kernel memory to be "
                   2471:                                    "used for socket buffers"),
1.94      yamt     2472:                       sysctl_kern_somaxkva, 0, NULL, 0,
                   2473:                       CTL_KERN, KERN_SOMAXKVA, CTL_EOL);
1.212     pooka    2474:
                   2475:        sysctl_createv(&socket_sysctllog, 0, NULL, NULL,
                   2476:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   2477:                       CTLTYPE_INT, "sbmax",
                   2478:                       SYSCTL_DESCR("Maximum socket buffer size"),
                   2479:                       sysctl_kern_sbmax, 0, NULL, 0,
                   2480:                       CTL_KERN, KERN_SBMAX, CTL_EOL);
1.94      yamt     2481: }

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